2017年6月12日星期一
For customers to correctly select the high temperature submersible pump model
There is a customer in Guangdong, two months ago inquiry high temperature submersible pump, but the model has been repeatedly uncertain. Before the beginning of high temperature submersible pump selection is 65WQR20-25-4. According to the customer high temperature submersible pump selection, and asked the number, it directly reported the price. Later, the customer asked 80WQR30-30-5.5 the price of this model, the number is so much, I really reported. But this is the question has been asked me, ask the price, and gradually began to doubt that the customer is to set the price. I will directly ask the customer: I come to help you choose it, the vertical distance of the water supply how much it, an hour need to drain much. Customer answer: This I am not very clear, will choose the type of trouble, but the site of the high temperature submersible pump selection requirements, you can send me a look, or direct selection, the above data should be accurate, A detailed offer directly to the mailbox. Read the customer sent over the working conditions, and finally high temperature submersible pump selection for the 100WQ80-15-7.5, the customer is written above the unit is L / min, conversion over the required flow is relatively large, small head, in order not to let Customers worry that I did not arbitrarily to his high temperature submersible pump selection, how I choose the process is also written on the quotation. Because the amount is also a lot, the customer is also worried about the problem, only to ask this model, ask that model, but also did not ask the focus. Now the customer to get back to say that you can develop a contract, and hope that the price can be a little for him, he is also running the site, the quality of clearance, and he continued to sell the high temperature submersible pump. Often because of high temperature submersible pump selection problems, customers will be tangled for a long time, as long as we say that the next case, Zhengzhou Dragon Pump Co., Ltd. can at any time for your selection, high temperature sewage pump, hot water submersible pump, Multi-resistant high temperature sewage pump prices, you can always call us
As long as the sewage pump is of good quality, it can lead to a large list.
Last year, a customer in Taizhou City, told me to buy two wastewater treatment pumps. I know he is not engaged in the wholesale and retail pump, but do other products, it is estimated that his relationship households to the sewage pump, so he found me on the Internet. But I still send messages every weekend greetings, after all, is a cooperation. In March of this year, he called to consult a sewage pump, said to be equipped with stainless steel impeller or the overall stainless steel sewage pump, I was reported the price, and asked his customers over there the actual situation, so that he can choose the right The Contacted a few times, but has not been ordered. At the beginning of this month, he called again to ask the pump, but still not under the single. Oh, it is estimated that his customers do not hurry it Last week, he finally ordered, let me do it, I said good, but this is custom, not a conventional pump, let him call the money in advance, just that day is Saturday, he said can not do public Public payment, then I said next Monday it Wait until this Monday, he did not play money, although I was a little anxious heart, but did not call him. The day before yesterday, I worry about is not to buy elsewhere, and call him. He said sewage pump to ask me if the price is not real price? Do not go to the wholesale market to buy cheaper sewage submersible pumps than my Oh Oh, I said can not be compared, each product positioning is different, our family only good quality, the bearing is imported from Japan NSK, impeller is 304 casting, absolutely not iron pressure, the motor is the old Y standard copper Line of. Customers smiled and said, and asked me tomorrow morning before 9 o'clock can not do a good job, we pass this bus, to him to go. I say it! (In fact, too late, when I let the driver sent in the past, also more than an hour's drive) he said now people outside, go back after the arrangements for the purchase price. But yesterday did not play money to me. But the sewage pump has been done, and I think about it, to a thorough put. Yesterday morning I called him, said the afternoon the driver to the way to your side of the delivery, sewage pump to the words I let him take the past. Customers even said that the best, I immediately arranged the purchase price. Half an hour later, I received the boss phone, said there is a payment to the company account. I'm done, I let the workshop arrangements, the afternoon delivery to the customer that. The original customer is because the transport is not convenient and dragged, Oh, the right medicine immediately resolved. At the same time I also understand the old customers regardless of the size of the list can not be lost, keep in touch, maybe someday give you a big list.
Methods for detecting leaks in self - piping pump pipelines
Self-suction pump pipe leakage will lead to suction is not on the water (self-absorption height of less than), and even lead to pump flow is not enough and the head is not enough. In short a sentence: If the self-suction pump pipe leakage will lead to changes in the parameters of the pump, then the detection of self-suction pump pipe leak is the most important thing when we install the pump, the following we usually check the method Give you some of the list, I hope to help customers.
(1) duck hair method: with a duck down, in the pump running close to the suspected air intake, observe the duck fluttering situation. Similarly, the use of lit cigarettes can be operated by this method. Through the ducks and flue gas fluttering direction to help find.
(2) oil method: the difficult to identify the intake point, can be determined in the intake part of the air coated with a little oil, oil was quickly sucked away that is the air intake.
2, to prevent self-priming centrifugal pump intake measures
(1) Self-priming pump should be installed as close as possible to the surface, to ensure that the water level is not absorbed into the air.
(2) When installing the suction pipe, the inlet horizontal pipe should be tilted down or horizontally in the direction of the water, and the inlet pipe should not be higher than the pump inlet at any point, otherwise the air in the pipe will be excluded.
(3) to prevent packing gas leakage. Packing hopper should be appropriate, if too loose, should be tightened packing gland; packing damage, failure, should be replaced; packing cover water pipe plug and heat, will cause packing cover leakage, should clean water seal The
(4) with the flange connected to the water pipe installed before the two flanges to contact the plane clean and clean, the middle plus a 3 ~ 5mm thick pad, to be symmetrical, several times to gradually bolts tighten The
(5) self-suction pump bottom valve to have enough submerged depth, from the valve plane flood depth should be equal to the bottom valve diameter of 1.5 to 2 times, at least not less than 0.5m. If submerged too shallow, easy to form a vortex, which sucked into the air, resulting in cavitation and damage to the impeller and pump shell. If you find the pump running into the water level down quickly, you can put a few pieces of wood on the surface to reduce the vortex, to prevent air into the pump shell.check out best submersible Water pumps
(6) self-priming pump body with a gas plug, in order to facilitate the gas, the same thread can be used in place of the same type of faucet plug, bleed open the faucet can be.
(7) suction pump suction port at the degree of vacuum is limited, the vacuum is too large, easy to pump water vaporization, self-absorption pump work disadvantage. Therefore, the respective suction pump has its maximum allowable suction, generally between 3 ~ 8.5m, the installation should be controlled in this range.
(8) pay attention to exhaust. Before starting the self-priming pump should be enough water to exclude the air from the suction pump; usually should be regularly open the pump cover on the air plug, remove the accumulation of air inside
(1) duck hair method: with a duck down, in the pump running close to the suspected air intake, observe the duck fluttering situation. Similarly, the use of lit cigarettes can be operated by this method. Through the ducks and flue gas fluttering direction to help find.
(2) oil method: the difficult to identify the intake point, can be determined in the intake part of the air coated with a little oil, oil was quickly sucked away that is the air intake.
2, to prevent self-priming centrifugal pump intake measures
(1) Self-priming pump should be installed as close as possible to the surface, to ensure that the water level is not absorbed into the air.
(2) When installing the suction pipe, the inlet horizontal pipe should be tilted down or horizontally in the direction of the water, and the inlet pipe should not be higher than the pump inlet at any point, otherwise the air in the pipe will be excluded.
(3) to prevent packing gas leakage. Packing hopper should be appropriate, if too loose, should be tightened packing gland; packing damage, failure, should be replaced; packing cover water pipe plug and heat, will cause packing cover leakage, should clean water seal The
(4) with the flange connected to the water pipe installed before the two flanges to contact the plane clean and clean, the middle plus a 3 ~ 5mm thick pad, to be symmetrical, several times to gradually bolts tighten The
(5) self-suction pump bottom valve to have enough submerged depth, from the valve plane flood depth should be equal to the bottom valve diameter of 1.5 to 2 times, at least not less than 0.5m. If submerged too shallow, easy to form a vortex, which sucked into the air, resulting in cavitation and damage to the impeller and pump shell. If you find the pump running into the water level down quickly, you can put a few pieces of wood on the surface to reduce the vortex, to prevent air into the pump shell.check out best submersible Water pumps
(6) self-priming pump body with a gas plug, in order to facilitate the gas, the same thread can be used in place of the same type of faucet plug, bleed open the faucet can be.
(7) suction pump suction port at the degree of vacuum is limited, the vacuum is too large, easy to pump water vaporization, self-absorption pump work disadvantage. Therefore, the respective suction pump has its maximum allowable suction, generally between 3 ~ 8.5m, the installation should be controlled in this range.
(8) pay attention to exhaust. Before starting the self-priming pump should be enough water to exclude the air from the suction pump; usually should be regularly open the pump cover on the air plug, remove the accumulation of air inside
2017年6月7日星期三
Maintenance of DG - type boiler feed water pump
Boiler Feed Pump Overview:
Boiler feed pump suitable for conveying temperature below 110 ° C of water or physical and chemical properties similar to the water non-corrosive to other liquids, widely used in industrial and mining enterprises and institutions of the boiler water supply and urban life water supply. DG series pumps are particularly suitable for boiler feed water.
Boiler feed pump maintenance reasons:
Vibration value is too large, more than 0.2mm;
Boiler feed pump repair content:
1) to find the coupling, adjust the axial clearance of the coupling;
2) check, repair in the operation of the various defects, adjust the bearing gap, tighten the various parts of the bolt;
3) check and clean the cooling water system;
4) disintegration, check the parts of the wear and tear, corrosion and erosion degree, be overhauled or replaced;
5) check the shaft wear, corrosion and not straight, to repair or replace;
6) correction shaft, impeller dynamic balance;
Boiler Feedwater Pump Structure Description:
Boiler feed pump for horizontal multi-stage pump, both ends of the support. The housing part is the segment type, the pump transmission way is through the elastic diaphragm coupling and the electric machinery connection. The direction of rotation of the pump from the drive side to see the pump, clockwise rotation.
1, the stator part:
Mainly in the suction section, the middle, spit out the section, guide vane, and so on, respectively, with tightening bolts into one, spit mouth and suction port for the vertical direction.
2, the rotor part:
Mainly shaft, impeller, balance plate and sleeve components and other components.
3, the pump seal:
Single-ended mechanical seal
A, the suction section, the middle section, between the discharge section of the static joint with a rubber seal sealed.
B, the use of retaining retaining water, to prevent water into the bearing.
4, the bearing part:
The entire rotor is supported by a sliding bearing at both ends of the shaft. The bearings are automatically lubricated with petrol stations.
Boiler feed pump maintenance procedures
1, the demolition of the boiler feed pump
1) split the coupling cover, coupling bolts, demolition of cooling water pipes, pump air valve;
2) Remove the pump cover bolts, packing gland bolts, remove the packing gland, smooth lift the pump cover on the designated location;
3) Remove both sides of the bearing cap bolts and non-drive side end caps, remove the bearing cover, hang the rotor;
2, boiler feed pump rotor disassembly
1) Remove the coupling with a special tool;
2) Remove the rolling bearing and the bearing with copper rods gently knocked out;
3) Loosen the sleeve and cap on both sides, remove the sleeve and remove the components such as the flange and the packing seat seal ring. Such as impeller corrosion or serious ring wear, the use of heating methods, with a special tool to remove the impeller;
3, boiler feed pump inspection and repair
1) Turn the pump cover to clean up the check surface without blown, burr;
2) Clean the pump shaft and place the axis on the dedicated "V" type iron upper school bend;
3) check the impeller cavitation and repair, clean up the impeller runner, remove the rust;
4) clean check the sleeve;
5) clean check seal ring;
6) check clean bearing whether the wear and tear, rotation is flexible, with or without noise;
7) bearing room with kerosene clean, oil cup clearly visible oil level;
8) Put the impeller, the sleeve into the shaft, and then tighten the ends and cap on the special "V" iron or on the bearing school Colonel;
9) clean check the coupling, wheel bolts and elastic ring without damage;
10) clean check the pump body, combined with the surface with a radiant cloth polished clean;check details of submersible tube well pumps
Boiler feed pump disassembly should pay attention to:
1) in the demolition of the pump shaft when the components such as hand hammering must use copper rods, can not hurt the pump shaft;
2) Remove the components must be placed in order in order, and do the number in order to buy back;
3) the input end fastening nut is anti-silk;
Boiler feed pump suitable for conveying temperature below 110 ° C of water or physical and chemical properties similar to the water non-corrosive to other liquids, widely used in industrial and mining enterprises and institutions of the boiler water supply and urban life water supply. DG series pumps are particularly suitable for boiler feed water.
Boiler feed pump maintenance reasons:
Vibration value is too large, more than 0.2mm;
Boiler feed pump repair content:
1) to find the coupling, adjust the axial clearance of the coupling;
2) check, repair in the operation of the various defects, adjust the bearing gap, tighten the various parts of the bolt;
3) check and clean the cooling water system;
4) disintegration, check the parts of the wear and tear, corrosion and erosion degree, be overhauled or replaced;
5) check the shaft wear, corrosion and not straight, to repair or replace;
6) correction shaft, impeller dynamic balance;
Boiler Feedwater Pump Structure Description:
Boiler feed pump for horizontal multi-stage pump, both ends of the support. The housing part is the segment type, the pump transmission way is through the elastic diaphragm coupling and the electric machinery connection. The direction of rotation of the pump from the drive side to see the pump, clockwise rotation.
1, the stator part:
Mainly in the suction section, the middle, spit out the section, guide vane, and so on, respectively, with tightening bolts into one, spit mouth and suction port for the vertical direction.
2, the rotor part:
Mainly shaft, impeller, balance plate and sleeve components and other components.
3, the pump seal:
Single-ended mechanical seal
A, the suction section, the middle section, between the discharge section of the static joint with a rubber seal sealed.
B, the use of retaining retaining water, to prevent water into the bearing.
4, the bearing part:
The entire rotor is supported by a sliding bearing at both ends of the shaft. The bearings are automatically lubricated with petrol stations.
Boiler feed pump maintenance procedures
1, the demolition of the boiler feed pump
1) split the coupling cover, coupling bolts, demolition of cooling water pipes, pump air valve;
2) Remove the pump cover bolts, packing gland bolts, remove the packing gland, smooth lift the pump cover on the designated location;
3) Remove both sides of the bearing cap bolts and non-drive side end caps, remove the bearing cover, hang the rotor;
2, boiler feed pump rotor disassembly
1) Remove the coupling with a special tool;
2) Remove the rolling bearing and the bearing with copper rods gently knocked out;
3) Loosen the sleeve and cap on both sides, remove the sleeve and remove the components such as the flange and the packing seat seal ring. Such as impeller corrosion or serious ring wear, the use of heating methods, with a special tool to remove the impeller;
3, boiler feed pump inspection and repair
1) Turn the pump cover to clean up the check surface without blown, burr;
2) Clean the pump shaft and place the axis on the dedicated "V" type iron upper school bend;
3) check the impeller cavitation and repair, clean up the impeller runner, remove the rust;
4) clean check the sleeve;
5) clean check seal ring;
6) check clean bearing whether the wear and tear, rotation is flexible, with or without noise;
7) bearing room with kerosene clean, oil cup clearly visible oil level;
8) Put the impeller, the sleeve into the shaft, and then tighten the ends and cap on the special "V" iron or on the bearing school Colonel;
9) clean check the coupling, wheel bolts and elastic ring without damage;
10) clean check the pump body, combined with the surface with a radiant cloth polished clean;check details of submersible tube well pumps
Boiler feed pump disassembly should pay attention to:
1) in the demolition of the pump shaft when the components such as hand hammering must use copper rods, can not hurt the pump shaft;
2) Remove the components must be placed in order in order, and do the number in order to buy back;
3) the input end fastening nut is anti-silk;
Multi - stage boiler feed water pump without sealed water consequences and role
Boiler Feedwater Pump Seal Water is a chemical deaerated water and condensate water as a main water source, a spare! The two water sources are qualified water, and industrial water quality is not qualified!
1, the role of boiler water supply pump seal water is:
1) to the high-pressure water pump, although the seal but still have a certain pressure, in order to prevent the water pump through the shaft and seal the gap between the leakage, from the condensate pump outlet, or salt water jellyfish Pipe a water source as a sealed water!
2) The water in the feed pump is water with a certain high temperature, which is transferred to the bearing through the shaft or pump metal of the pump, so that the temperature of the bearing rises. In order to control this temperature, the sealing water also cools The role.
2, the boiler feed pump without sealed water Consequences:
1) When the seal water passes through the seal, the water forms a water film between the shaft and the seal as the shaft rotates at high speed, preventing the shaft from directly rubbing against the seal. When the loss of sealing water, so that the pump will be high-pressure water supply through the pump shaft and seal the gap between the leakage, resulting in a large number of refrigerant loss;
2) at the same time high temperature of the water supply through the pump shaft and pump metal temperature to the bearing, so that the bearing temperature increases, but also make the bearing burned;check out for farmland water pumps
3) high-speed rotation of the bearing and the gap between the seal is very small, when the loss of sealing water, where the water film will be destroyed, the shaft and the seal is likely to friction, so that the pump to increase the vibration Will cause equipment outage and damage.
So do not underestimate the situation without sealing water, if the pump seal water is just water back to the water is back to the condenser, I suggest you immediately cut the standby seal water, or a short time may also cause the vacuum and damage The risk of pump bearings, in fact, as the condensate pump outlet to adjust this way it is nothing is not desirable is only necessary to control the opening to prevent the whole after the logic of the jump pump that the pump back bad, it should be impossible, because each plant on the condensate Pump protection is due to the logic that is: when the exit of the electric door closed in place after the linkage jump pump.
1, the role of boiler water supply pump seal water is:
1) to the high-pressure water pump, although the seal but still have a certain pressure, in order to prevent the water pump through the shaft and seal the gap between the leakage, from the condensate pump outlet, or salt water jellyfish Pipe a water source as a sealed water!
2) The water in the feed pump is water with a certain high temperature, which is transferred to the bearing through the shaft or pump metal of the pump, so that the temperature of the bearing rises. In order to control this temperature, the sealing water also cools The role.
2, the boiler feed pump without sealed water Consequences:
1) When the seal water passes through the seal, the water forms a water film between the shaft and the seal as the shaft rotates at high speed, preventing the shaft from directly rubbing against the seal. When the loss of sealing water, so that the pump will be high-pressure water supply through the pump shaft and seal the gap between the leakage, resulting in a large number of refrigerant loss;
2) at the same time high temperature of the water supply through the pump shaft and pump metal temperature to the bearing, so that the bearing temperature increases, but also make the bearing burned;check out for farmland water pumps
3) high-speed rotation of the bearing and the gap between the seal is very small, when the loss of sealing water, where the water film will be destroyed, the shaft and the seal is likely to friction, so that the pump to increase the vibration Will cause equipment outage and damage.
So do not underestimate the situation without sealing water, if the pump seal water is just water back to the water is back to the condenser, I suggest you immediately cut the standby seal water, or a short time may also cause the vacuum and damage The risk of pump bearings, in fact, as the condensate pump outlet to adjust this way it is nothing is not desirable is only necessary to control the opening to prevent the whole after the logic of the jump pump that the pump back bad, it should be impossible, because each plant on the condensate Pump protection is due to the logic that is: when the exit of the electric door closed in place after the linkage jump pump.
What is the role of boiler feed pump front pump
Feed water front pump role: in order to improve the deaerator in the sliding operation of the economy, while ensuring the safe operation of the water pump, and the pump running in series.more about tube well water pumps
1, the first forward pump speed is low, reducing the NPSH (which is based on the steam pump similarity theorem: the same pump of the NPSH is proportional to the square of the speed!), While the front pump with double suction impeller As well as corrosion-resistant materials, so that the main steam pump to avoid cavitation;
2, due to the low speed of the front pump, the required pump inlet pouring height reduction, thus reducing the height of the deaerator installation, saving the construction costs of the plant.
Boiler feed pump front pump application:
1, commercial power generation on behalf of enterprises: Shanghai electric repair, submerged, Zhengzhou Electric Power, KSB, etc .;
2, enterprise-owned power station: Chongqing pump factory, dark blue, Garley, Cole, Sulzer and so on.
3, the commercial power generation pump for the self-owned power plant boiler feed pump can produce the same, but this pump is too small, many times it may not participate, and Chongqing pump is to expand this area, the future will give this market Impact.
1, the first forward pump speed is low, reducing the NPSH (which is based on the steam pump similarity theorem: the same pump of the NPSH is proportional to the square of the speed!), While the front pump with double suction impeller As well as corrosion-resistant materials, so that the main steam pump to avoid cavitation;
2, due to the low speed of the front pump, the required pump inlet pouring height reduction, thus reducing the height of the deaerator installation, saving the construction costs of the plant.
Boiler feed pump front pump application:
1, commercial power generation on behalf of enterprises: Shanghai electric repair, submerged, Zhengzhou Electric Power, KSB, etc .;
2, enterprise-owned power station: Chongqing pump factory, dark blue, Garley, Cole, Sulzer and so on.
3, the commercial power generation pump for the self-owned power plant boiler feed pump can produce the same, but this pump is too small, many times it may not participate, and Chongqing pump is to expand this area, the future will give this market Impact.
2017年6月2日星期五
Boiler Feedwater Pump Balanced Tube Low Pressure
Boiler feed pump balance tube role:
The balance tube is from the outlet seal ring of the pump, which leads to the inlet end of the pump, which is called the balance tube. Its main role is to balance the axial thrust pump to reduce the axial movement of the rotor to prevent the impeller and the shell friction.welcome to apk buy Boiler Feed water Pumps
When the boiler feed pump is in operation, the impeller outlet discharges the high pressure liquid, and the part flows to the impeller, so that the pressure behind the impeller is basically the same as the outlet, and the front side of the leaf transmission line is the suction end, the pressure is very low. In this way, the impeller on both sides of a larger pressure difference, will produce a point to the pump inlet and axis parallel to the axial thrust, so that the entire rotor pressure to the suction side, serious impeller and pump casing friction or impact, affecting the pump The safe operation, it must try to be balanced.
Balanced axial thrust of many ways, such as the use of double suction impeller or symmetrical arrangement of impeller (multi-stage pump), the use of balance hole, balance plate, balance drum and so on. The balance tube is only one way to balance the axial thrust, which is the pressure liquid behind the impeller, with the balance pipe to the inlet side, so that the pressure on both sides of the impeller balance. This method is simple, but can not fully balance the axial thrust, the remaining axial thrust, need to be set by the thrust bearing to bear.
Simple understanding of the balance plate The principle and the thrust bearing on the turbine similar to the balance tube and the thrust bearing on the role of the return pipe similar.
Boiler Feedwater Pump Balanced Tube Low Pressure Reason:
1, since it is balanced tube, that balance tube pressure should not change too much, or is blocked or missed.
2, the balance tube used to eliminate the axial thrust, the pump outlet valve closed or behind the block, the balance pipe pressure is high; pump exhaust when the balance pipe pressure is low, the normal pressure remains unchanged.
3, high-pressure feed water pumps balance pipe pressure slightly higher than the inlet pressure, if the pressure increases, indicating that the balance between the drum and the balance between the drum sets larger, if the pressure reached 2-3 times the inlet pressure, the best disintegration check.
The balance tube is from the outlet seal ring of the pump, which leads to the inlet end of the pump, which is called the balance tube. Its main role is to balance the axial thrust pump to reduce the axial movement of the rotor to prevent the impeller and the shell friction.welcome to apk buy Boiler Feed water Pumps
When the boiler feed pump is in operation, the impeller outlet discharges the high pressure liquid, and the part flows to the impeller, so that the pressure behind the impeller is basically the same as the outlet, and the front side of the leaf transmission line is the suction end, the pressure is very low. In this way, the impeller on both sides of a larger pressure difference, will produce a point to the pump inlet and axis parallel to the axial thrust, so that the entire rotor pressure to the suction side, serious impeller and pump casing friction or impact, affecting the pump The safe operation, it must try to be balanced.
Balanced axial thrust of many ways, such as the use of double suction impeller or symmetrical arrangement of impeller (multi-stage pump), the use of balance hole, balance plate, balance drum and so on. The balance tube is only one way to balance the axial thrust, which is the pressure liquid behind the impeller, with the balance pipe to the inlet side, so that the pressure on both sides of the impeller balance. This method is simple, but can not fully balance the axial thrust, the remaining axial thrust, need to be set by the thrust bearing to bear.
Simple understanding of the balance plate The principle and the thrust bearing on the turbine similar to the balance tube and the thrust bearing on the role of the return pipe similar.
Boiler Feedwater Pump Balanced Tube Low Pressure Reason:
1, since it is balanced tube, that balance tube pressure should not change too much, or is blocked or missed.
2, the balance tube used to eliminate the axial thrust, the pump outlet valve closed or behind the block, the balance pipe pressure is high; pump exhaust when the balance pipe pressure is low, the normal pressure remains unchanged.
3, high-pressure feed water pumps balance pipe pressure slightly higher than the inlet pressure, if the pressure increases, indicating that the balance between the drum and the balance between the drum sets larger, if the pressure reached 2-3 times the inlet pressure, the best disintegration check.
Reason and Solution of Pressure Fluctuation in Boiler Feed Water Pumps
Boiler feed pump is the unit load, steam flow and other thermal capacity to adjust, to determine the boiler feed pump in the automatic situation is normal swing, first determine whether the unit caused by abnormal causes, check the pump in place the sound is normal, or Oxygen water level is normal, the water supply temperature is too high, the boiler feed pump pump cavitation is normal, the work of the filter is blocked, and grease is qualified, the analysis of a pump failure, from its entire system To consider and to exclude them one by one.check out boiler feed water pump price
Boiler feed pump pressure fluctuations of the reasons and solutions:
1, if the inlet pressure is low, the import filter to block, check the pump is not cavitation, exhaust, the greatest possibility is cavitation or gas tied.
2, check the inlet level of the pump is too low, whether the filter is blocked, whether the inlet pipe leak, the inlet valve is fully open and so on.
3, to see if the pump current is stable? Is there any speed with the tachometer? And then look at the pump inlet and outlet of the vacuum gauge and pressure gauge is normal?
4, if the water pump to the water shortage, check the pump inlet valve, water, whether leaks and so on.
5, may consider the inlet of the pump with gas (steam) or cavitation, check the inlet or not to the vacuum pump (including spare part of the pump), hot water level is low, condensate temperature is high, and if To the vibration of the words can not rule out the possibility of the pump itself.
6, if the pump filter plug should be the current increases, the pressure will not fluctuate back and forth, it should be leaked the air.
8, check the balance plate small sets of aprons is broken or the water gap has changed, should be carefully examined.
9, if the pump does not use the inverter, the export pressure gauge of the normal fluctuations in the amount of about 0.02 to 0.03 MPa between the export check valve of the heavy hammer, but also with the beating.
Boiler feed pump pressure fluctuations of the reasons and solutions:
1, if the inlet pressure is low, the import filter to block, check the pump is not cavitation, exhaust, the greatest possibility is cavitation or gas tied.
2, check the inlet level of the pump is too low, whether the filter is blocked, whether the inlet pipe leak, the inlet valve is fully open and so on.
3, to see if the pump current is stable? Is there any speed with the tachometer? And then look at the pump inlet and outlet of the vacuum gauge and pressure gauge is normal?
4, if the water pump to the water shortage, check the pump inlet valve, water, whether leaks and so on.
5, may consider the inlet of the pump with gas (steam) or cavitation, check the inlet or not to the vacuum pump (including spare part of the pump), hot water level is low, condensate temperature is high, and if To the vibration of the words can not rule out the possibility of the pump itself.
6, if the pump filter plug should be the current increases, the pressure will not fluctuate back and forth, it should be leaked the air.
8, check the balance plate small sets of aprons is broken or the water gap has changed, should be carefully examined.
9, if the pump does not use the inverter, the export pressure gauge of the normal fluctuations in the amount of about 0.02 to 0.03 MPa between the export check valve of the heavy hammer, but also with the beating.
2017年5月26日星期五
Causes of Leakage of Mechanical Seal of Boiler Pump and Its Treatment
Boiler pump mechanical seal is an indispensable part of power machinery and fluid machinery, which is of great significance to the safety of machinery. Boiler pump mechanical seal leakage for a variety of reasons, such as the problem of sealing flushing water, the device itself flaws, filling the media on the device corrosion, sealing performance, etc., for these problems must start from the root, in turn solve the process, equipment , Maintenance, operation on the issue, only to do all-round troubleshooting can completely solve the mechanical seal problem, to ensure the good operation of the boiler pump machinery.
In actual production, different operating conditions and production conditions will have an important impact on the mechanical seal of the boiler pump, and may even lead to the loss of the basic performance of the boiler pump machinery. Therefore, the analysis of the cause of the leakage of the mechanical seal of the boiler pump has important practical significance and safety Meaning, a comprehensive analysis of the reasons can improve the safety, mechanical Jia moving rate. Mechanical life, etc., so the choice of mechanical seal for the maintenance of many enterprises has always been a top priority.
Reasons for Failure of Mechanical Seal of Boiler Pump
1, corrosion caused by mechanical seal failure
Boiler pump mechanical seal corrosion, including metal ring corrosion, non-metallic ring corrosion and auxiliary seals and contact parts of the corrosion.
1) metal ring corrosion
Metal ring itself does not have anti-corrosion ability, direct contact with corrosive media surface will be corrosion, the initial stage will be strange sound, leakage, wear and so on. Corrosion will spread to the inside at a certain speed. Under the action of external force, the metal ring will be stress-deformed, and the exposed part is the hardest hit area, and gradually affect the other areas through the weak link, and then produce mechanical seal leakage.
2) non-metallic ring corrosion
Graphite ring is also a mechanical seal is one of the important reasons, the cross-section temperature is too high, improper choice of impregnated resin, impregnated resin depth is not enough and so are the cause of graphite ring corrosion. When the graphite ring in the oxidizing medium, the overall cooling or poor friction, the environment produced three or four hundred degrees will lead to graphite and oxidative media oxidation reaction, so that the end becomes loses performance.
3) corrosion of auxiliary seals and contact parts
Different materials have different corrosion resistance, auxiliary sealing material is generally selected with elastic rubber, and rubber corrosion will make the surface becomes unusually rough, loss of the original elasticity. And rubber high temperature performance is relatively poor, generally not more than two hundred degrees.
And the auxiliary seal in contact with the site in a relatively static state, between the gap and friction between the two will be the cause of corrosion, and the corrosion surface is generally wide and deeper.
Failure Performance of Boiler Pump Mechanical Seal
During the production process, the reason for the leakage of the mechanical seal of the boiler pump has its own reasons and external causes, the choice of materials and the way of installation and use will cause the mechanical seal failure, failure of the failure performance is also different, learn through different failures Performance and make correct and timely judgments can provide a strong support for the actual production.
1, static pressure test leaked
Mechanical seal device in the installation because the staff is not careful, often make the seal face was bumped so that deformation and damage, cleaning is not thorough enough, making the mechanical seal folder with granular impurities, or because the positioning screw loose, gland no pressure Tight and the accuracy of the machine equipment is not high enough to make the sealing surface is not fully fit between, will cause mechanical seal failure, media leakage. If there is a leak in the sleeve, the reason may be that the compression of the sleeve seal is not enough or not compressed, it is possible that the device has been damaged.
2, periodic leaks
Mechanical seal components in the periodic rotation of the rotor components and axial movement is too large will be in the mechanical seal of the leakage, the sealing surface of the mechanical seal to be a certain stress to play a good role in sealing. To do the above requirements, the mechanical seal of the spring device must have a certain amount of compression to the end of a certain role in the stress, so that the mechanical seal to achieve the desired sealing effect. At the same time in order to ensure that the stress is in the appropriate range, the pump shaft can not have a larger amount of movement, but the actual design often appear unreasonable factors, making the pump shaft movement is higher than expected, which mechanical seal performance has a large degree Negative Effects.
3, mechanical seals often leaked
The longitudinal leakage caused by the damage of the sealed end face has a mechanical seal. The graphite end face is uniformly ring-shaped groove, the annular deep groove produced at the graphite section, the wear of the graphite inner edge, the graphite ring step is worn, , Graphite ring fracture, graphite ring on the corrosion pits, carbide surface cracks and burns.
Auxiliary seal caused by the frequent leakage failure performance of the end of wear, mosaic ring loose and so on.
Spring-induced leaks include rotor vibration, loose parts, media problems, and damage to mechanical seal assistance.
4, other mechanical seal leakage
In addition to the above several common leak performance, there are mechanical seal vibration is too large, pumping the air caused by the seal leakage, sealing cavity cavitation caused by sealing leakage, sealing the end of the vaporization caused by leakage, pump vibration caused by excessive leakage, There is no flushing seal leaks and so on.more about farmland irrigation water pumps
Mechanical seal leakage measures
1, install the faulty equipment
The appearance of the fault and the actual operation and the internal structure of the machinery have a certain relationship, some incentives will be in a certain situation conditions lead to the occurrence of failure, as long as the relevant incentives can be found through some of the failure to eliminate the failure of equipment incentives. For example, in the pump outlet to install the electrical contact pressure gauge, the pump boiler pump and pump outlet pressure to establish a chain, if the pump out of pressure will automatically power off. In order to prevent the phenomenon of reversing the pump when the pump is automatically pumped, a single flow valve can be added to the automatic pump outlet.
2, to improve the equipment structure
Mechanical seal in the structural design there is a certain irrational, these unreasonable structure to increase the risk of leakage of mechanical seals. Under conditions permitting, the structure of the mechanical seal can be redesigned to minimize the risk of leakage. Such as the mechanical seal of the end face are mostly double-end design, double-sided surface to increase the device and the media contact area, thereby increasing the risk of corrosion. From the perspective of security can be double-sided design into a single-ended closed bellows mechanical design.
3, select the appropriate composition of materials
Different materials, different corrosion resistance, the corrosive requirements of the mechanical seal composition of the material has good corrosion resistance, if the choice of materials will reduce the equipment life. Ceramics by the chemical nature of the material is not active, it is difficult to react with the media oxidation, so the purchase of mechanical seals can focus on the use of ceramic sealing ring.
4, to improve the operator's professional skills
The failure of mechanical seals in addition to the mechanical causes of their own factors, such as the impact of improper operation of the operator does not lead to the occurrence of adverse consequences. In order to eliminate the similar avoidance of errors, it is necessary to carry out professional knowledge training for the operator and develop the instruction manual and precautionary note, promote standard operation, introduce anti-fouling measures, maintain the equipment on a regular basis, and reduce the impact of human factors lowest.
5, to improve the maintenance effect
Regular maintenance is an important means of finding problems and preventing problems, but many employees treat it as a general routine, that is to walk through the field, just doing it at the time of maintenance. The work attitude of the staff makes some problems not found at an early stage, and it is too late until the problem breaks out completely. Employees should pay attention to every detail in the maintenance, do not ignore any bit, the company can take some incentives to encourage staff maintenance of the initiative, so as to improve the maintenance effect.
Boiler pump mechanical seal leakage in the production of intermediate frequency failure, must be targeted to solve the problem, in the analysis of the causes of failure on the basis of equipment to improve the installation of anti-fault equipment, do regular maintenance management, in order to minimize the probability of failure
In actual production, different operating conditions and production conditions will have an important impact on the mechanical seal of the boiler pump, and may even lead to the loss of the basic performance of the boiler pump machinery. Therefore, the analysis of the cause of the leakage of the mechanical seal of the boiler pump has important practical significance and safety Meaning, a comprehensive analysis of the reasons can improve the safety, mechanical Jia moving rate. Mechanical life, etc., so the choice of mechanical seal for the maintenance of many enterprises has always been a top priority.
Reasons for Failure of Mechanical Seal of Boiler Pump
1, corrosion caused by mechanical seal failure
Boiler pump mechanical seal corrosion, including metal ring corrosion, non-metallic ring corrosion and auxiliary seals and contact parts of the corrosion.
1) metal ring corrosion
Metal ring itself does not have anti-corrosion ability, direct contact with corrosive media surface will be corrosion, the initial stage will be strange sound, leakage, wear and so on. Corrosion will spread to the inside at a certain speed. Under the action of external force, the metal ring will be stress-deformed, and the exposed part is the hardest hit area, and gradually affect the other areas through the weak link, and then produce mechanical seal leakage.
2) non-metallic ring corrosion
Graphite ring is also a mechanical seal is one of the important reasons, the cross-section temperature is too high, improper choice of impregnated resin, impregnated resin depth is not enough and so are the cause of graphite ring corrosion. When the graphite ring in the oxidizing medium, the overall cooling or poor friction, the environment produced three or four hundred degrees will lead to graphite and oxidative media oxidation reaction, so that the end becomes loses performance.
3) corrosion of auxiliary seals and contact parts
Different materials have different corrosion resistance, auxiliary sealing material is generally selected with elastic rubber, and rubber corrosion will make the surface becomes unusually rough, loss of the original elasticity. And rubber high temperature performance is relatively poor, generally not more than two hundred degrees.
And the auxiliary seal in contact with the site in a relatively static state, between the gap and friction between the two will be the cause of corrosion, and the corrosion surface is generally wide and deeper.
Failure Performance of Boiler Pump Mechanical Seal
During the production process, the reason for the leakage of the mechanical seal of the boiler pump has its own reasons and external causes, the choice of materials and the way of installation and use will cause the mechanical seal failure, failure of the failure performance is also different, learn through different failures Performance and make correct and timely judgments can provide a strong support for the actual production.
1, static pressure test leaked
Mechanical seal device in the installation because the staff is not careful, often make the seal face was bumped so that deformation and damage, cleaning is not thorough enough, making the mechanical seal folder with granular impurities, or because the positioning screw loose, gland no pressure Tight and the accuracy of the machine equipment is not high enough to make the sealing surface is not fully fit between, will cause mechanical seal failure, media leakage. If there is a leak in the sleeve, the reason may be that the compression of the sleeve seal is not enough or not compressed, it is possible that the device has been damaged.
2, periodic leaks
Mechanical seal components in the periodic rotation of the rotor components and axial movement is too large will be in the mechanical seal of the leakage, the sealing surface of the mechanical seal to be a certain stress to play a good role in sealing. To do the above requirements, the mechanical seal of the spring device must have a certain amount of compression to the end of a certain role in the stress, so that the mechanical seal to achieve the desired sealing effect. At the same time in order to ensure that the stress is in the appropriate range, the pump shaft can not have a larger amount of movement, but the actual design often appear unreasonable factors, making the pump shaft movement is higher than expected, which mechanical seal performance has a large degree Negative Effects.
3, mechanical seals often leaked
The longitudinal leakage caused by the damage of the sealed end face has a mechanical seal. The graphite end face is uniformly ring-shaped groove, the annular deep groove produced at the graphite section, the wear of the graphite inner edge, the graphite ring step is worn, , Graphite ring fracture, graphite ring on the corrosion pits, carbide surface cracks and burns.
Auxiliary seal caused by the frequent leakage failure performance of the end of wear, mosaic ring loose and so on.
Spring-induced leaks include rotor vibration, loose parts, media problems, and damage to mechanical seal assistance.
4, other mechanical seal leakage
In addition to the above several common leak performance, there are mechanical seal vibration is too large, pumping the air caused by the seal leakage, sealing cavity cavitation caused by sealing leakage, sealing the end of the vaporization caused by leakage, pump vibration caused by excessive leakage, There is no flushing seal leaks and so on.more about farmland irrigation water pumps
Mechanical seal leakage measures
1, install the faulty equipment
The appearance of the fault and the actual operation and the internal structure of the machinery have a certain relationship, some incentives will be in a certain situation conditions lead to the occurrence of failure, as long as the relevant incentives can be found through some of the failure to eliminate the failure of equipment incentives. For example, in the pump outlet to install the electrical contact pressure gauge, the pump boiler pump and pump outlet pressure to establish a chain, if the pump out of pressure will automatically power off. In order to prevent the phenomenon of reversing the pump when the pump is automatically pumped, a single flow valve can be added to the automatic pump outlet.
2, to improve the equipment structure
Mechanical seal in the structural design there is a certain irrational, these unreasonable structure to increase the risk of leakage of mechanical seals. Under conditions permitting, the structure of the mechanical seal can be redesigned to minimize the risk of leakage. Such as the mechanical seal of the end face are mostly double-end design, double-sided surface to increase the device and the media contact area, thereby increasing the risk of corrosion. From the perspective of security can be double-sided design into a single-ended closed bellows mechanical design.
3, select the appropriate composition of materials
Different materials, different corrosion resistance, the corrosive requirements of the mechanical seal composition of the material has good corrosion resistance, if the choice of materials will reduce the equipment life. Ceramics by the chemical nature of the material is not active, it is difficult to react with the media oxidation, so the purchase of mechanical seals can focus on the use of ceramic sealing ring.
4, to improve the operator's professional skills
The failure of mechanical seals in addition to the mechanical causes of their own factors, such as the impact of improper operation of the operator does not lead to the occurrence of adverse consequences. In order to eliminate the similar avoidance of errors, it is necessary to carry out professional knowledge training for the operator and develop the instruction manual and precautionary note, promote standard operation, introduce anti-fouling measures, maintain the equipment on a regular basis, and reduce the impact of human factors lowest.
5, to improve the maintenance effect
Regular maintenance is an important means of finding problems and preventing problems, but many employees treat it as a general routine, that is to walk through the field, just doing it at the time of maintenance. The work attitude of the staff makes some problems not found at an early stage, and it is too late until the problem breaks out completely. Employees should pay attention to every detail in the maintenance, do not ignore any bit, the company can take some incentives to encourage staff maintenance of the initiative, so as to improve the maintenance effect.
Boiler pump mechanical seal leakage in the production of intermediate frequency failure, must be targeted to solve the problem, in the analysis of the causes of failure on the basis of equipment to improve the installation of anti-fault equipment, do regular maintenance management, in order to minimize the probability of failure
Specification and use of boiler feed pump inlet filter
Boiler feed pump inlet filter can boiler boiler in the suspended solids, mechanical debris, such as filtering, and according to the size of the pressure on the filter for manual cleaning. The filter can meet the requirements of various working conditions, suitable for a variety of filtration occasions, product performance and quality and stability, according to user requirements for the design, its role is to filter the melt flow and increase the flow resistance, to filter out the mechanical impurities and improve the mix Refining or plasticizing effect.WWW.Dragon-pump.com
Boiler feed pump inlet filter Technical parameters:
Type: horizontal, horizontal, flange connection;
Material: shell carbon steel material, filter and other parts are stainless steel (304 stainless steel, sheet drilling);
Medium: condensate;
Design parameters: pressure for the vacuum ~ 0.1MPa.a, the design temperature of 50 ℃;
Take over the size: Φ325 × 7;
Length: L ≤ 700;
Arrangement direction: level;
Filtering accuracy Φ2;
Passing rate 1: 4.5;
Pressure loss <250mm / H20;
Flow 296t / h;
With accessories: anti-flange and connectors;
Quantity: each machine two, the whole plant a total of four;
The filter design life is 30 years.
Closed boiler feed pump inlet filter:
Type: horizontal, horizontal, flange connection;
Material: shell carbon steel material, filter and other parts are stainless steel (304 stainless steel, sheet drilling);
Medium: desalted water;
Design parameters: design pressure 1.6MPa.a, design temperature 50 ℃;
Take over the size: Φ325 × 7.5;
Length: L ≤ 800;
Arrangement direction: level;
Filtering accuracy Φ2;
Passing rate 1: 4.5;
Pressure loss <250mm / H20;
Flow rate 650t / h;
With accessories: anti-flange and connectors;
Quantity: each machine two, the whole plant a total of four;
Filter design life of 30 years;
The machines that install the filters become filters that are used to filter natural water and food, and some of the main filters are paint and paint impurities.
Boiler feed pump inlet filter features:
Direct filtration, simple process, good air permeability, uniformity and stability, no leakage, good regeneration performance, fast regeneration, easy installation, high efficiency, long service life.More about Boiler pumps manufacturers
It is mainly used in air conditioning, purifier, range hood, air cleaner, dehumidifier, and dust collector. It is suitable for all kinds of filtration, dust removal and separation requirements. It is suitable for petroleum, chemical, mineral, food, Painting and other industries of the filter.
Painting filter material can be divided into two kinds of metal and plastic, filter installed in the gun on the location of different types, such as gun under the filter, the tip of the filter, the general stainless steel and nylon material is better.
Boiler feed pump inlet filter Technical parameters:
Type: horizontal, horizontal, flange connection;
Material: shell carbon steel material, filter and other parts are stainless steel (304 stainless steel, sheet drilling);
Medium: condensate;
Design parameters: pressure for the vacuum ~ 0.1MPa.a, the design temperature of 50 ℃;
Take over the size: Φ325 × 7;
Length: L ≤ 700;
Arrangement direction: level;
Filtering accuracy Φ2;
Passing rate 1: 4.5;
Pressure loss <250mm / H20;
Flow 296t / h;
With accessories: anti-flange and connectors;
Quantity: each machine two, the whole plant a total of four;
The filter design life is 30 years.
Closed boiler feed pump inlet filter:
Type: horizontal, horizontal, flange connection;
Material: shell carbon steel material, filter and other parts are stainless steel (304 stainless steel, sheet drilling);
Medium: desalted water;
Design parameters: design pressure 1.6MPa.a, design temperature 50 ℃;
Take over the size: Φ325 × 7.5;
Length: L ≤ 800;
Arrangement direction: level;
Filtering accuracy Φ2;
Passing rate 1: 4.5;
Pressure loss <250mm / H20;
Flow rate 650t / h;
With accessories: anti-flange and connectors;
Quantity: each machine two, the whole plant a total of four;
Filter design life of 30 years;
The machines that install the filters become filters that are used to filter natural water and food, and some of the main filters are paint and paint impurities.
Boiler feed pump inlet filter features:
Direct filtration, simple process, good air permeability, uniformity and stability, no leakage, good regeneration performance, fast regeneration, easy installation, high efficiency, long service life.More about Boiler pumps manufacturers
It is mainly used in air conditioning, purifier, range hood, air cleaner, dehumidifier, and dust collector. It is suitable for all kinds of filtration, dust removal and separation requirements. It is suitable for petroleum, chemical, mineral, food, Painting and other industries of the filter.
Painting filter material can be divided into two kinds of metal and plastic, filter installed in the gun on the location of different types, such as gun under the filter, the tip of the filter, the general stainless steel and nylon material is better.
2017年5月25日星期四
Installation of non - clogging submersible sewage pump
No clogging submersible sewage pump installed in what way
(1) submersible pump installation according to the location of the submersible pump can be divided into:
① vertical installation: (vertical) pump installed in the vertical direction of the spindle, the installation of the bracket.Sewage Pump vertical installation is limited by the working environment of the pump (eg piping pumps, submerged pumps, deep well pumps, bobbin pumps, submersible pumps), installation space constraints (vertical marine pumps) and design factors (eg vertical high speed pumps) decided.
② Horizontal installation Install (horizontal) pump according to the horizontal direction of the spindle installed on the foundation, the installation of the bracket, which is the installation of most pumps.
(2) the installation of sewage pump by pump position can be divided into:
① wet installation: the pump part or all installed in the liquid installation method This compact installation, small footprint, can be installed directly in the sewage pool, without the need to build a dedicated pump room to install pumps and motors, you can save a lot Of the land and infrastructure costs, easy installation and maintenance; but the pump's good performance, high insulation performance requirements.
② dry installation: the pump completely placed in the liquid outside the installation, which is the installation of most of the pump, with intuitive maintenance, size is appropriate, the lower requirements of the motor pump, the characteristics of strong adaptability
(3) submersible sewage pump installed by the pump can be moved into
① mobile installation: the pump or its components installed on a removable carrier (such as car) installation method. This installation method is used in small, intermittent use, the use of more occasions.
② fixed type sewage pump: installed: the pump fixed to the foundation or bracket on the installation, is the most commonly used installation.
(1) submersible pump installation according to the location of the submersible pump can be divided into:
① vertical installation: (vertical) pump installed in the vertical direction of the spindle, the installation of the bracket.Sewage Pump vertical installation is limited by the working environment of the pump (eg piping pumps, submerged pumps, deep well pumps, bobbin pumps, submersible pumps), installation space constraints (vertical marine pumps) and design factors (eg vertical high speed pumps) decided.
② Horizontal installation Install (horizontal) pump according to the horizontal direction of the spindle installed on the foundation, the installation of the bracket, which is the installation of most pumps.
(2) the installation of sewage pump by pump position can be divided into:
① wet installation: the pump part or all installed in the liquid installation method This compact installation, small footprint, can be installed directly in the sewage pool, without the need to build a dedicated pump room to install pumps and motors, you can save a lot Of the land and infrastructure costs, easy installation and maintenance; but the pump's good performance, high insulation performance requirements.
② dry installation: the pump completely placed in the liquid outside the installation, which is the installation of most of the pump, with intuitive maintenance, size is appropriate, the lower requirements of the motor pump, the characteristics of strong adaptability
(3) submersible sewage pump installed by the pump can be moved into
① mobile installation: the pump or its components installed on a removable carrier (such as car) installation method. This installation method is used in small, intermittent use, the use of more occasions.
② fixed type sewage pump: installed: the pump fixed to the foundation or bracket on the installation, is the most commonly used installation.
Boiler feed Pump Operation Precautions and Related Requirements
Boiler feed pump operation considerations and related requirements:
1, the boiler pump test run before the inspection items are as follows:
(1) refueling car: check the pump on the oil cup, to the hole within the oil, turbo coupling, turning should be flexible, no abnormal phenomenon;
(2) check the anchor bolts should be no loosening;
(3) the lubricating parts are added lubricating oil, the need for cooling parts have been filled with cooling oil;
(4) the instructions instrument, safety protection devices and electronic control devices should be sensitive, accurate and reliable;
(5) The direction of the motor should be in accordance with the direction of the pump: Before connecting the battery, replace the connection plate (back wheel) to connect the screw, check the motor direction after power, turn the correct direction, and then connect to avoid reverse.
(6) centrifugal pump must be filled with water and then start, should not be idle. Boiler water pump center, such as lower than the suction surface, you do not need irrigation, just put the pump air can be released. If the boiler water pump center is higher than the suction surface, should first open the suction pipe valve and vent, close the discharge pipe valve, to be vented with water, the speed is normal, then open the outlet pipe valve, and pump regulation To design conditions.
(7) boiler water pump in the case of closing start, the running time should generally not exceed 2-3 minutes, such as the time is too long, the pump liquid heat, easy to cause accidents, it should be timely parking.
2, the boiler pump test run when the motor temperature, boiler water pump operation, pressure gauge and vacuum table pointer values, interface tightness, etc. should meet the standard specification requirements, as follows:
(1) operation should not have abnormal vibration and sound, the precision seal should not be leaked, fastening the connection parts can not be loose;
(2) bearing temperature rise must comply with the provisions of the equipment manual;
(3) boiler water pump safety protection box electronic control devices and parts of the instrument to be sensitive, reliable and accurate;
(4) Boiler pump under the design of the continuous test run time should not be less than 2h;
(5) the temperature of the shaft seal filler should be normal, without special requirements in the case of ordinary filler leakage shall not be greater than 35-60ml / h;
(6) The motor current and power should not exceed the rated value.
3, boiler water pump should stop running after the following requirements:
First close the pump at the exit of the valve, until the pump cooling and then turn off the auxiliary system of the valve, and then cut off the power to stop the pump;click this website：Dragon-pump.com
Should be put away the pump to accumulate the liquid to prevent corrosion.
1, the boiler pump test run before the inspection items are as follows:
(1) refueling car: check the pump on the oil cup, to the hole within the oil, turbo coupling, turning should be flexible, no abnormal phenomenon;
(2) check the anchor bolts should be no loosening;
(3) the lubricating parts are added lubricating oil, the need for cooling parts have been filled with cooling oil;
(4) the instructions instrument, safety protection devices and electronic control devices should be sensitive, accurate and reliable;
(5) The direction of the motor should be in accordance with the direction of the pump: Before connecting the battery, replace the connection plate (back wheel) to connect the screw, check the motor direction after power, turn the correct direction, and then connect to avoid reverse.
(6) centrifugal pump must be filled with water and then start, should not be idle. Boiler water pump center, such as lower than the suction surface, you do not need irrigation, just put the pump air can be released. If the boiler water pump center is higher than the suction surface, should first open the suction pipe valve and vent, close the discharge pipe valve, to be vented with water, the speed is normal, then open the outlet pipe valve, and pump regulation To design conditions.
(7) boiler water pump in the case of closing start, the running time should generally not exceed 2-3 minutes, such as the time is too long, the pump liquid heat, easy to cause accidents, it should be timely parking.
2, the boiler pump test run when the motor temperature, boiler water pump operation, pressure gauge and vacuum table pointer values, interface tightness, etc. should meet the standard specification requirements, as follows:
(1) operation should not have abnormal vibration and sound, the precision seal should not be leaked, fastening the connection parts can not be loose;
(2) bearing temperature rise must comply with the provisions of the equipment manual;
(3) boiler water pump safety protection box electronic control devices and parts of the instrument to be sensitive, reliable and accurate;
(4) Boiler pump under the design of the continuous test run time should not be less than 2h;
(5) the temperature of the shaft seal filler should be normal, without special requirements in the case of ordinary filler leakage shall not be greater than 35-60ml / h;
(6) The motor current and power should not exceed the rated value.
3, boiler water pump should stop running after the following requirements:
First close the pump at the exit of the valve, until the pump cooling and then turn off the auxiliary system of the valve, and then cut off the power to stop the pump;click this website：Dragon-pump.com
Should be put away the pump to accumulate the liquid to prevent corrosion.
The working principle of frequency conversion feed pump
Frequency conversion is mainly to change the speed of the pump to adjust the flow, of course, there are some pressure control system, relays, solenoid valves, etc., the frequency converter regulator to be supplied by the relay in order to achieve automatic water supply, frequency conversion principle is to change the pump speed To control the displacement, so do not have frequent start and stop. The working principle is to change the speed of the motor according to the working conditions, with the motor speed to adjust the pump conditions
People say that the frequency conversion pump is actually a pump driven by a variable frequency motor. The advantage is to automatically maintain a certain constant pressure pump, so that the pump can work more effectively to meet the requirements of users, saving energy, the use of frequency converter to change the pump speed, to adjust the pump flow and pressure, the inverter in general Have closed-loop control function, can be automatically controlled according to the pressure signal operation, to achieve constant pressure water supply.
Frequency of feed pump working principle:
1, variable frequency pump frequency conversion energy:
From the fluid mechanics, P (power) = Q (flow) ╳H (pressure), the flow Q is proportional to the first power of the speed N, the pressure H is proportional to the square of the speed N, the power P is proportional to the cubic of the speed N , If the efficiency of the pump is constant, when the required regulation of flow down, the speed N can be proportional to the decline, while the shaft output power P set the relationship between the decline. That is, the power consumption of the pump motor and the speed of the approximate ratio of the establishment of the relationship. For example: a pump motor power of 55KW, when the speed down to the original speed of 4/5, the power consumption of 28.16KW, saving 48.8%, when the speed dropped to the original speed of 1/2, the power consumption The amount of 6.875KW, saving 87.5%, variable frequency pump power factor compensation for energy saving.CHECK out this website: http://www.dragon-pump.com to know APK company
Reactive power not only increase the line loss and equipment heat, more important is the power factor to reduce the power grid caused by the reduction of active power, a large number of reactive energy consumption in the line, the use of equipment inefficient and wasteful by the formula P = S ╳COSФ, Q = S╳SINФ, which S-apparent power, P-active power, Q-reactive power, COSφ-power factor, we can see the larger COSФ, the greater the active power P, the general power of the pump motor power factor 0.6-0.7, the use of frequency control device, due to the role of inverter internal filter capacitor, COSФ ≈ 1, thereby reducing the reactive power loss, increasing the active power of the grid.
2, the frequency of the pump's soft start energy saving:
As the motor is directly activated or Y / D start, the starting current is equal to (4-7) times the rated current, which will cause serious impact on the mechanical and electrical equipment and power supply network, but also on the grid capacity requirements are too high, High current and vibration on the baffle and the valve damage greatly, the equipment, pipeline life is extremely unfavorable. The use of frequency conversion device, the use of the inverter soft start function will start the current from zero, the maximum does not exceed the rated current, reducing the impact on the power grid and the power supply requirements, extending the use of equipment and valves life. Saving equipment maintenance costs.
People say that the frequency conversion pump is actually a pump driven by a variable frequency motor. The advantage is to automatically maintain a certain constant pressure pump, so that the pump can work more effectively to meet the requirements of users, saving energy, the use of frequency converter to change the pump speed, to adjust the pump flow and pressure, the inverter in general Have closed-loop control function, can be automatically controlled according to the pressure signal operation, to achieve constant pressure water supply.
Frequency of feed pump working principle:
1, variable frequency pump frequency conversion energy:
From the fluid mechanics, P (power) = Q (flow) ╳H (pressure), the flow Q is proportional to the first power of the speed N, the pressure H is proportional to the square of the speed N, the power P is proportional to the cubic of the speed N , If the efficiency of the pump is constant, when the required regulation of flow down, the speed N can be proportional to the decline, while the shaft output power P set the relationship between the decline. That is, the power consumption of the pump motor and the speed of the approximate ratio of the establishment of the relationship. For example: a pump motor power of 55KW, when the speed down to the original speed of 4/5, the power consumption of 28.16KW, saving 48.8%, when the speed dropped to the original speed of 1/2, the power consumption The amount of 6.875KW, saving 87.5%, variable frequency pump power factor compensation for energy saving.CHECK out this website: http://www.dragon-pump.com to know APK company
Reactive power not only increase the line loss and equipment heat, more important is the power factor to reduce the power grid caused by the reduction of active power, a large number of reactive energy consumption in the line, the use of equipment inefficient and wasteful by the formula P = S ╳COSФ, Q = S╳SINФ, which S-apparent power, P-active power, Q-reactive power, COSφ-power factor, we can see the larger COSФ, the greater the active power P, the general power of the pump motor power factor 0.6-0.7, the use of frequency control device, due to the role of inverter internal filter capacitor, COSФ ≈ 1, thereby reducing the reactive power loss, increasing the active power of the grid.
2, the frequency of the pump's soft start energy saving:
As the motor is directly activated or Y / D start, the starting current is equal to (4-7) times the rated current, which will cause serious impact on the mechanical and electrical equipment and power supply network, but also on the grid capacity requirements are too high, High current and vibration on the baffle and the valve damage greatly, the equipment, pipeline life is extremely unfavorable. The use of frequency conversion device, the use of the inverter soft start function will start the current from zero, the maximum does not exceed the rated current, reducing the impact on the power grid and the power supply requirements, extending the use of equipment and valves life. Saving equipment maintenance costs.
What are the feed water pump filter installation methods?
The water pump filter is divided into two types: coarse filter, ordinary filter, precision filter and special fine filter according to their filtration precision (filter size of impurities). They can filter more than 100μm, 10 ~ 100μm , 5 to 10 μm and 1 to 5 μm in size.More about Boiler pump manufacturers.
1, the filter accuracy should meet the predetermined requirements. In a long time to maintain adequate flow of energy;
2, the filter has enough strength, not because of the role of hydraulic damage;
3, filter corrosion resistance, and can work at a specified temperature for a long time. Filter cleaning or replacement is simple.
Installation of the feed water pump filter in the hydraulic system installation location are usually the following:
1, to be installed in the suction port of the feed pump:
Pump oil suction circuit is generally installed with a surface type oil filter, the purpose is to filter out the larger impurity particles to protect the hydraulic pump, in addition to the filter capacity of the filter should be more than twice the pump flow, the pressure loss is less than 0.02MPa.
2, installed in the outlet pump on the road:
The purpose of the oil filter installed here is to filter out contaminants that may penetrate valves and other components. Its filtration accuracy should be 10 ~ 15μm, and can withstand the working pressure on the oil and the impact pressure, the pressure drop should be less than 0.35MPa. At the same time should be installed safety valve to prevent the filter plug.
3, installed in the return pump on the water supply system:
This installation of indirect filtering effect, generally with the filter and even install a back pressure valve, when the filter block to a certain pressure value, the back pressure valve open. Installed on the system branch oil. Separate filtration system: large hydraulic system can be set up a hydraulic pump and oil filter composed of independent filter circuit. In addition to the entire system required for the oil system, but also often in some important components (such as servo valves, precision throttle valve, etc.) in front of a separate installation of a dedicated fine filter to ensure their normal work.click here
Feed water pump filter installation, switch valve - filter - bellows / soft connector - feed pump. The pump inlet is installed directly, and the diffusion filter has the function of filtering impurities. It also has stable water flow, prevents cavitation, improves pump efficiency, saves pump inlet diversion tube, and can greatly reduce installation space.
1, the filter accuracy should meet the predetermined requirements. In a long time to maintain adequate flow of energy;
2, the filter has enough strength, not because of the role of hydraulic damage;
3, filter corrosion resistance, and can work at a specified temperature for a long time. Filter cleaning or replacement is simple.
Installation of the feed water pump filter in the hydraulic system installation location are usually the following:
1, to be installed in the suction port of the feed pump:
Pump oil suction circuit is generally installed with a surface type oil filter, the purpose is to filter out the larger impurity particles to protect the hydraulic pump, in addition to the filter capacity of the filter should be more than twice the pump flow, the pressure loss is less than 0.02MPa.
2, installed in the outlet pump on the road:
The purpose of the oil filter installed here is to filter out contaminants that may penetrate valves and other components. Its filtration accuracy should be 10 ~ 15μm, and can withstand the working pressure on the oil and the impact pressure, the pressure drop should be less than 0.35MPa. At the same time should be installed safety valve to prevent the filter plug.
3, installed in the return pump on the water supply system:
This installation of indirect filtering effect, generally with the filter and even install a back pressure valve, when the filter block to a certain pressure value, the back pressure valve open. Installed on the system branch oil. Separate filtration system: large hydraulic system can be set up a hydraulic pump and oil filter composed of independent filter circuit. In addition to the entire system required for the oil system, but also often in some important components (such as servo valves, precision throttle valve, etc.) in front of a separate installation of a dedicated fine filter to ensure their normal work.click here
Feed water pump filter installation, switch valve - filter - bellows / soft connector - feed pump. The pump inlet is installed directly, and the diffusion filter has the function of filtering impurities. It also has stable water flow, prevents cavitation, improves pump efficiency, saves pump inlet diversion tube, and can greatly reduce installation space.
2017年5月24日星期三
Boiler Pump Valve Parts Material Selection and Troubleshooting
Today, boiler feed pumps manufacturer to take you to learn about the boiler pump valve parts of the material applicable occasions and often encounter fault maintenance methods.
1, the valve body, bonnet and valve often encounter fault maintenance methods
phenomenon
Leakage of valve body and bonnet
the reason
Cast iron casting quality is not high, the valve body and valve cover body with trachoma, loose tissue, slag and other defects;
Day cold cracking;
Poor welding, there is slag, no welding, stress cracks and other defects;
The cast iron valve is damaged by heavy objects.
Maintenance method
Improve the quality of casting, before the installation in strict accordance with the provisions of strength test;
The temperature of 0 ° and 0 ° below the valve should be insulated or mixed heat, stop the use of the valve should be excluded from the water;
The welds of the valve body and bonnet, which are made of welding, shall be carried out in accordance with the relevant welding procedure and shall be tested and tested after welding.
Do not allow the use of hand hammer impact cast iron and non-metallic valves, large diameter valve installation should be bracket.
Bonding method
The use of adhesive curing fast characteristics, in a timely manner near the pin coated with adhesive, the establishment of a new solid seal structure, to stop the purpose of leakage. It is a special function of the use of adhesives with pressure plugging a way.
Welding method
In the valve body leakage medium pressure is low, the leakage is small, you can use a more than twice the diameter of the leak more than the nut, so that the leakage medium from the nut out, the nut welded to the valve body, A bolt with the same specifications of the nut, the bottom of the nut placed a rubber pad or asbestos pad, the top of the bolt around the raw tape into the nut, to prevent the purpose of leakage.
For the leakage medium pressure, leakage of large valve body, drainage welding method can be used. First with a piece of iron, the middle of the opening of a hole, a well with the hole diameter of the isolation valve welded to the iron plate on the hole, open the isolation valve, the iron plate at the central hole at the leakage point fit in the valve body, So that the leakage medium through the iron plate and the isolation valve out of the central valve.
In the body of the leakage medium high temperature and pressure, but the adjustment valve has a larger shape and size, leakage is not the case can also be used welding method.
2, the valve seal often encounter fault maintenance methods
phenomenon:
Seal at the junction of the seal
the reason:
The seal is not tight;
Sealing ring and the body welding, welding quality is poor;
Seal connection thread, screw, pressure ring loose;
The seal is connected and corroded.
Maintenance method:
Sealed at the pressure of the leak should be injected with adhesive and then rolling fixed;
Seal ring should be re-welding according to welding specifications, welding can not repair welding should be removed when the original welding and processing;
Remove the screws, press the ring to clean, replace the damaged parts, grind the seal and connect the seat seal, reassemble. Corrosion damage to the larger parts, welding, bonding and other methods can be used to repair;
Seal connection surface is corroded, can be used grinding, bonding and other methods to repair, can not be repaired when the seal should be replaced.
3 valve stem often encounter fault maintenance methods
phenomenon
Stem is not flexible
the reason
Stem with it with the processing of low precision, with the gap is too small;
Stem, stem nut, bracket, gland, packing and other axes are not in a straight line;
Packing pressure too tight;
Stem bent, damaged;
Thread is not clean or rusty, poor lubrication conditions;
Nut loose, thread slip wire;
The stem is loose or damaged at the connection to the drive.
Maintenance method:
Improve the valve stem, stem nuts and other processing accuracy and repair quality, so that the gap should be appropriate;
When assembling the stem and its connection, the gap is consistent, keep concentric, flexible rotation;
Packing pressure too tight, the appropriate relaxation gland;
Stem bending should be corrected, for those who are difficult to correct, should be replaced. When operating the stem, the closing force is appropriate;
Stem, stem nut thread should always be cleaned and add lubricants, high temperature valves, should be coated with disulfide pins or graphite powder for lubrication;
Stem nut loose should be repaired, can not repair the timely replacement;
So that the nuts at the oil flow, lubrication is good, do not often operate the valve, regular inspection and activities about the stem, found that wear and bite the phenomenon of timely repair stem nuts, brackets and other accessories;
To properly operate the valve, the closing force to be appropriate, so as not to deformation and damage to the valve stem;
After closing, the valve is hot expansion of the occasion, the valve closed, the interval of a certain time, the hand wheel counterclockwise reverse a little to prevent the stem to death.
4 valve packing often encounter fault maintenance methods
phenomenon
Packing at the leak
the reason
Packing selection is not right, intolerant medium corrosion, intolerance of high pressure or vacuum valve, high temperature or low temperature use;
Fill the installation of the wrong, there is a small generation on behalf of large, spiral coiled joints bad, tight under the loose and other defects;
Packing over the use of the period, has been aging, loss of flexibility;
Stem precision is not high, there are bending, corrosion, wear and other defects;
The number of fillings is insufficient, the gland is not pressed;
Glands, bolts, and other parts are damaged, so that the gland can not be pressed;
Improper operation, excessive force;
Gland skew, gland and stem between the gap is too small or too large, resulting in stem wear, packing damage.click this website
Maintenance method
The material and type of packing shall be selected according to working conditions;
According to the relevant provisions of the correct installation of packing, packing should be placed by pressing, the joints should be 30 ℃ or 45 ℃;
The use of the period is too long, aging, damage to the filler should be replaced;
Stem bending, after wear should be straightening, repair, serious damage should be promptly replaced;
Fill should be installed in accordance with the provisions of the number of laps, gland should be symmetrical even tight, pressure sets should be more than 5mm preload gap;
Damaged glands, bolts and other parts should be repaired or replaced in time;
Should comply with the operating procedures, in addition to the impact of hand wheel, the normal operation of uniform power;
Should be evenly symmetrical tighten gland bolts, gland and stem gap is too small, should be appropriate to increase the gap, gland and stem clearance is too large, should be replaced.
1, the valve body, bonnet and valve often encounter fault maintenance methods
phenomenon
Leakage of valve body and bonnet
the reason
Cast iron casting quality is not high, the valve body and valve cover body with trachoma, loose tissue, slag and other defects;
Day cold cracking;
Poor welding, there is slag, no welding, stress cracks and other defects;
The cast iron valve is damaged by heavy objects.
Maintenance method
Improve the quality of casting, before the installation in strict accordance with the provisions of strength test;
The temperature of 0 ° and 0 ° below the valve should be insulated or mixed heat, stop the use of the valve should be excluded from the water;
The welds of the valve body and bonnet, which are made of welding, shall be carried out in accordance with the relevant welding procedure and shall be tested and tested after welding.
Do not allow the use of hand hammer impact cast iron and non-metallic valves, large diameter valve installation should be bracket.
Bonding method
The use of adhesive curing fast characteristics, in a timely manner near the pin coated with adhesive, the establishment of a new solid seal structure, to stop the purpose of leakage. It is a special function of the use of adhesives with pressure plugging a way.
Welding method
In the valve body leakage medium pressure is low, the leakage is small, you can use a more than twice the diameter of the leak more than the nut, so that the leakage medium from the nut out, the nut welded to the valve body, A bolt with the same specifications of the nut, the bottom of the nut placed a rubber pad or asbestos pad, the top of the bolt around the raw tape into the nut, to prevent the purpose of leakage.
For the leakage medium pressure, leakage of large valve body, drainage welding method can be used. First with a piece of iron, the middle of the opening of a hole, a well with the hole diameter of the isolation valve welded to the iron plate on the hole, open the isolation valve, the iron plate at the central hole at the leakage point fit in the valve body, So that the leakage medium through the iron plate and the isolation valve out of the central valve.
In the body of the leakage medium high temperature and pressure, but the adjustment valve has a larger shape and size, leakage is not the case can also be used welding method.
2, the valve seal often encounter fault maintenance methods
phenomenon:
Seal at the junction of the seal
the reason:
The seal is not tight;
Sealing ring and the body welding, welding quality is poor;
Seal connection thread, screw, pressure ring loose;
The seal is connected and corroded.
Maintenance method:
Sealed at the pressure of the leak should be injected with adhesive and then rolling fixed;
Seal ring should be re-welding according to welding specifications, welding can not repair welding should be removed when the original welding and processing;
Remove the screws, press the ring to clean, replace the damaged parts, grind the seal and connect the seat seal, reassemble. Corrosion damage to the larger parts, welding, bonding and other methods can be used to repair;
Seal connection surface is corroded, can be used grinding, bonding and other methods to repair, can not be repaired when the seal should be replaced.
3 valve stem often encounter fault maintenance methods
phenomenon
Stem is not flexible
the reason
Stem with it with the processing of low precision, with the gap is too small;
Stem, stem nut, bracket, gland, packing and other axes are not in a straight line;
Packing pressure too tight;
Stem bent, damaged;
Thread is not clean or rusty, poor lubrication conditions;
Nut loose, thread slip wire;
The stem is loose or damaged at the connection to the drive.
Maintenance method:
Improve the valve stem, stem nuts and other processing accuracy and repair quality, so that the gap should be appropriate;
When assembling the stem and its connection, the gap is consistent, keep concentric, flexible rotation;
Packing pressure too tight, the appropriate relaxation gland;
Stem bending should be corrected, for those who are difficult to correct, should be replaced. When operating the stem, the closing force is appropriate;
Stem, stem nut thread should always be cleaned and add lubricants, high temperature valves, should be coated with disulfide pins or graphite powder for lubrication;
Stem nut loose should be repaired, can not repair the timely replacement;
So that the nuts at the oil flow, lubrication is good, do not often operate the valve, regular inspection and activities about the stem, found that wear and bite the phenomenon of timely repair stem nuts, brackets and other accessories;
To properly operate the valve, the closing force to be appropriate, so as not to deformation and damage to the valve stem;
After closing, the valve is hot expansion of the occasion, the valve closed, the interval of a certain time, the hand wheel counterclockwise reverse a little to prevent the stem to death.
4 valve packing often encounter fault maintenance methods
phenomenon
Packing at the leak
the reason
Packing selection is not right, intolerant medium corrosion, intolerance of high pressure or vacuum valve, high temperature or low temperature use;
Fill the installation of the wrong, there is a small generation on behalf of large, spiral coiled joints bad, tight under the loose and other defects;
Packing over the use of the period, has been aging, loss of flexibility;
Stem precision is not high, there are bending, corrosion, wear and other defects;
The number of fillings is insufficient, the gland is not pressed;
Glands, bolts, and other parts are damaged, so that the gland can not be pressed;
Improper operation, excessive force;
Gland skew, gland and stem between the gap is too small or too large, resulting in stem wear, packing damage.click this website
Maintenance method
The material and type of packing shall be selected according to working conditions;
According to the relevant provisions of the correct installation of packing, packing should be placed by pressing, the joints should be 30 ℃ or 45 ℃;
The use of the period is too long, aging, damage to the filler should be replaced;
Stem bending, after wear should be straightening, repair, serious damage should be promptly replaced;
Fill should be installed in accordance with the provisions of the number of laps, gland should be symmetrical even tight, pressure sets should be more than 5mm preload gap;
Damaged glands, bolts and other parts should be repaired or replaced in time;
Should comply with the operating procedures, in addition to the impact of hand wheel, the normal operation of uniform power;
Should be evenly symmetrical tighten gland bolts, gland and stem gap is too small, should be appropriate to increase the gap, gland and stem clearance is too large, should be replaced.
What is the difference between a variable frequency boiler pump and a normal boiler pump?
In fact, the key to this problem is to figure out what is the frequency, why should the frequency, know the problem we can easily understand the variable frequency boiler and ordinary boiler pump is different, we often say that the frequency conversion is a motor Frequency conversion process, through the motor frequency to change the motor speed, so as to achieve the flow of the pump and other technical parameters of the adjustment, play a control role.Click to know Feedwater pumps ,
Frequency converter boiler pump and the difference between ordinary boiler pump:
1, the variable frequency pump motor is the variable frequency motor, the ordinary motor of the pump motor
Variable frequency motor design takes into account the motor running to low speed when the heat problem, using a separate powerful fan, anti-frequency converter in the high harmonics also do the corresponding treatment. Frequency conversion pump is the frequency change, used to control the speed, to achieve the required water flow.
2, frequency control motor and the appearance of the difference between the general motorCheck out this site: http://dragon-pump.com/boiler-feed-pump-for-sale to know boiler feed pump costs and prices.
The motor is no difference, that is, in front of the motor plus inverter control, inverter motor cooling fan is independent, which is to prevent the motor running for a long time low frequency caused by insufficient heat and specially designed, and ordinary motor cooling fan and motor rotor is This is the biggest difference in appearance.
Frequency converter boiler pump and the difference between ordinary boiler pump:
1, the variable frequency pump motor is the variable frequency motor, the ordinary motor of the pump motor
Variable frequency motor design takes into account the motor running to low speed when the heat problem, using a separate powerful fan, anti-frequency converter in the high harmonics also do the corresponding treatment. Frequency conversion pump is the frequency change, used to control the speed, to achieve the required water flow.
2, frequency control motor and the appearance of the difference between the general motorCheck out this site: http://dragon-pump.com/boiler-feed-pump-for-sale to know boiler feed pump costs and prices.
The motor is no difference, that is, in front of the motor plus inverter control, inverter motor cooling fan is independent, which is to prevent the motor running for a long time low frequency caused by insufficient heat and specially designed, and ordinary motor cooling fan and motor rotor is This is the biggest difference in appearance.
2017年5月23日星期二
How to improve the life of the boiler pump control valve
In the industrial automation instrument, the control valve is cumbersome, and the structure is simple, often not be taken seriously. However, it is in the process of pipeline, the working conditions are complex, once the problem, we are busy. Because of its heavy, difficult to find the problem, often effortless, but also involves the system put into operation, the system is complete, adjust the quality, environmental pollution. Today, for everyone to introduce 50 kinds of control valve fault handling methods, after the failure encountered no rush.Click to know Boiler feedwater pumps manufacturers
1, the failure of the boiler pump control valve key inspection of the site:
1) Body wall
For the use of high pressure and corrosive media in the occasion of the control valve, the valve body wall is often subject to the impact of media and corrosion, must focus on checking the pressure, corrosion resistance.
2) seat
When the valve is in operation, the inner surface of the thread for fixing the valve seat is susceptible to corrosion and the valve seat is loose. For valves operating under high pressure differential, check whether the sealing surface of the valve seat is damaged.
3) spool
Spool is the active parts of the valve when working, by the media erosion, the most serious corrosion, maintenance should carefully check the spool parts are corroded, wear, especially in the case of high pressure spool wear more serious (Due to cavitation phenomenon) should be noted. When the spool is damaged, it should be replaced. Also note that the stem also has a similar phenomenon, or loose connection with the spool and so on.
4) "O" type seals
"O" type seals and other gaskets are aged, cracked.
5) PTFE packing
Should pay attention to PTFE packing, seal grease is aging, with the surface is damaged, should be replaced when necessary.
2, to improve the control valve to the duration of the method:
1) large opening work to extend the life method
Let the start of the valve as far as possible in the maximum opening work, such as 90%. In this way, cavitation, erosion and other damage occurred in the spool head.
With the spool damage, the flow increases, the corresponding valve and then a little, so continue to damage, and gradually closed, so that the entire spool full use until the spool core and sealing surface damage, can not be used so far.
At the same time, large opening work gap gap, erosion weakened, which than the beginning of the valve in the middle of the opening and small opening work to improve the life of 1 to 5 times. Such a chemical plant using this method, the valve life increased by 2 times.
2) reduce the S increase the working opening to improve the life method
Reduce the S, that is, increase the system in addition to the loss of the control valve, so that the pressure drop to the valve down, in order to ensure that the flow through the control valve, will inevitably increase the valve opening, while the valve pressure drop Cavitation, erosion is also weakened.
Increase the working opening to improve the life of specific methods are:
Valve after the orifice throttling consumption pressure drop;
Close the manual valve in series on the line, to the control valve to obtain a better working opening date.
It is very simple, convenient and effective to use this method when the valve is selected at the beginning.
3) Reduce the diameter increase the working opening to improve the life method
The working opening is increased by reducing the diameter of the valve.
Reduce the caliber increase the working opening to improve the life of specific methods are:
For a small size of the valve, such as DN32 replaced DN25;
The valve body does not change, replace the small valve seat valve seat.
For example: a chemical plant overhaul when the throttle dgl0 replaced dg8, life increased by 1 times.
4) Transfer damage to the position to improve the life method
Transfer the damaged area to a secondary location to protect the sealing surface and throttling surface of the valve seat.
5) increase the throttling channel to improve the life of the law
The easiest way to increase the throttling channel is to thicken the seat so that the seat hole grows to form a longer throttling channel.
On the one hand can make the sudden expansion after the closure of the closure of the extension, from the destruction of the destruction of the location, so that the role away from the sealing surface; the other hand, increased the throttle resistance, reducing the degree of pressure recovery, Erosion weakened.
Some of the valve seat hole designed to be stepped, wave type, is to increase the resistance, weaken the cavitation. This method is often used when the high pressure valve in the introduction device is used and the old valve is improved.
6) change the flow to improve the life law
The flow direction, the cavitation and erosion mainly act on the sealing surface, so that the core of the spool and the valve seat sealing surface are quickly damaged; the flow closure is directed to the direction of flow, cavitation, erosion After throttling, the valve seat sealing surface below, to protect the sealing surface and spool root, extended life.
Pretending to open the use of the valve, when the extension of the life of the problem is more prominent, just change the flow can extend the life of 1 to 2 times.
7) use special materials to improve the life method
For anti-cavitation (broken shapes such as honeycomb dots) and scouring (streamlined trenches), throttle pieces can be made with special materials that are resistant to cavitation and erosion. This special material is 6YC-1, A4 steel, the Secretary too Lai, carbide and so on.
For corrosion resistance, you can switch to more corrosion-resistant, and have a certain mechanical properties, physical properties of the material. This material is divided into non-metallic materials (such as rubber, PTFE, ceramics, etc.) and metal materials (such as Monel, Hastelloy, etc.) two categories.
8) change the valve structure to improve the life method
To change the valve structure or use a longer life valve approach to achieve the purpose of improving life, such as the use of multi-stage valve, anti-cavitation valve, corrosion-resistant valve.
9) reduce the stroke to improve the diaphragm life method
For the two-position control valve, when the frequency is very frequent, the diaphragm will soon be broken up and down in the fold, the destruction of the location often in the tray circumference.https://www.dragonapkpump.wordpress.com
The easiest and most effective way to improve the life of the diaphragm is to reduce the stroke. The reduced stroke value is 1 / 4dg. Such as dgl25 valve, the standard stroke of 60mm, can be reduced to 30mm, reduced by 50%.
In addition, the following factors can be considered:
To meet the open and closed conditions to minimize the membrane chamber pressure;
Improve the finish of the tray and the film
1, the failure of the boiler pump control valve key inspection of the site:
1) Body wall
For the use of high pressure and corrosive media in the occasion of the control valve, the valve body wall is often subject to the impact of media and corrosion, must focus on checking the pressure, corrosion resistance.
2) seat
When the valve is in operation, the inner surface of the thread for fixing the valve seat is susceptible to corrosion and the valve seat is loose. For valves operating under high pressure differential, check whether the sealing surface of the valve seat is damaged.
3) spool
Spool is the active parts of the valve when working, by the media erosion, the most serious corrosion, maintenance should carefully check the spool parts are corroded, wear, especially in the case of high pressure spool wear more serious (Due to cavitation phenomenon) should be noted. When the spool is damaged, it should be replaced. Also note that the stem also has a similar phenomenon, or loose connection with the spool and so on.
4) "O" type seals
"O" type seals and other gaskets are aged, cracked.
5) PTFE packing
Should pay attention to PTFE packing, seal grease is aging, with the surface is damaged, should be replaced when necessary.
2, to improve the control valve to the duration of the method:
1) large opening work to extend the life method
Let the start of the valve as far as possible in the maximum opening work, such as 90%. In this way, cavitation, erosion and other damage occurred in the spool head.
With the spool damage, the flow increases, the corresponding valve and then a little, so continue to damage, and gradually closed, so that the entire spool full use until the spool core and sealing surface damage, can not be used so far.
At the same time, large opening work gap gap, erosion weakened, which than the beginning of the valve in the middle of the opening and small opening work to improve the life of 1 to 5 times. Such a chemical plant using this method, the valve life increased by 2 times.
2) reduce the S increase the working opening to improve the life method
Reduce the S, that is, increase the system in addition to the loss of the control valve, so that the pressure drop to the valve down, in order to ensure that the flow through the control valve, will inevitably increase the valve opening, while the valve pressure drop Cavitation, erosion is also weakened.
Increase the working opening to improve the life of specific methods are:
Valve after the orifice throttling consumption pressure drop;
Close the manual valve in series on the line, to the control valve to obtain a better working opening date.
It is very simple, convenient and effective to use this method when the valve is selected at the beginning.
3) Reduce the diameter increase the working opening to improve the life method
The working opening is increased by reducing the diameter of the valve.
Reduce the caliber increase the working opening to improve the life of specific methods are:
For a small size of the valve, such as DN32 replaced DN25;
The valve body does not change, replace the small valve seat valve seat.
For example: a chemical plant overhaul when the throttle dgl0 replaced dg8, life increased by 1 times.
4) Transfer damage to the position to improve the life method
Transfer the damaged area to a secondary location to protect the sealing surface and throttling surface of the valve seat.
5) increase the throttling channel to improve the life of the law
The easiest way to increase the throttling channel is to thicken the seat so that the seat hole grows to form a longer throttling channel.
On the one hand can make the sudden expansion after the closure of the closure of the extension, from the destruction of the destruction of the location, so that the role away from the sealing surface; the other hand, increased the throttle resistance, reducing the degree of pressure recovery, Erosion weakened.
Some of the valve seat hole designed to be stepped, wave type, is to increase the resistance, weaken the cavitation. This method is often used when the high pressure valve in the introduction device is used and the old valve is improved.
6) change the flow to improve the life law
The flow direction, the cavitation and erosion mainly act on the sealing surface, so that the core of the spool and the valve seat sealing surface are quickly damaged; the flow closure is directed to the direction of flow, cavitation, erosion After throttling, the valve seat sealing surface below, to protect the sealing surface and spool root, extended life.
Pretending to open the use of the valve, when the extension of the life of the problem is more prominent, just change the flow can extend the life of 1 to 2 times.
7) use special materials to improve the life method
For anti-cavitation (broken shapes such as honeycomb dots) and scouring (streamlined trenches), throttle pieces can be made with special materials that are resistant to cavitation and erosion. This special material is 6YC-1, A4 steel, the Secretary too Lai, carbide and so on.
For corrosion resistance, you can switch to more corrosion-resistant, and have a certain mechanical properties, physical properties of the material. This material is divided into non-metallic materials (such as rubber, PTFE, ceramics, etc.) and metal materials (such as Monel, Hastelloy, etc.) two categories.
8) change the valve structure to improve the life method
To change the valve structure or use a longer life valve approach to achieve the purpose of improving life, such as the use of multi-stage valve, anti-cavitation valve, corrosion-resistant valve.
9) reduce the stroke to improve the diaphragm life method
For the two-position control valve, when the frequency is very frequent, the diaphragm will soon be broken up and down in the fold, the destruction of the location often in the tray circumference.https://www.dragonapkpump.wordpress.com
The easiest and most effective way to improve the life of the diaphragm is to reduce the stroke. The reduced stroke value is 1 / 4dg. Such as dgl25 valve, the standard stroke of 60mm, can be reduced to 30mm, reduced by 50%.
In addition, the following factors can be considered:
To meet the open and closed conditions to minimize the membrane chamber pressure;
Improve the finish of the tray and the film
The Solution that Boiler pump control valve jammed or blocked
Boiler pump control valve jammed or blocked，how to solve？
1, cleaning method
Pipe slag, rust, slag and so on in the throttle, guide parts, the lower valve cover hole caused by blocking or stuck to the spool surface, the guide surface to produce strain and scratches, sealing surface indentation Wait. This often occurs in the new commissioning system and overhaul after the initial operation. This is the most common fault.
In this case, you must disengage the cleaning, remove the slag, such as the sealing surface should be damaged should also be grinding; at the same time to open the plug to flush out from the balance hole into the lower valve cover slag, Rinse. Before putting into operation, let the control valve fully open, the media flow for some time and then into the normal operation.
2, external scouring method
For some easy to precipitate, containing solid particles of the medium using ordinary valve adjustment, often in the throttle, the direction of the block, the bottom of the valve cover at the plug at the external flush gas and steam.
When the valve is blocked or jammed, open the external gas or steam valve, you can not move the valve in the case of the completion of the rinse work, the valve normal operation.click to visit Boiler feedwater pump manufacturer to know more.
3, install the pipe filter method
The small diameter of the control valve, especially the ultra-small flow control valve, the throttling gap is small, the media can not have a little bit of slag.
In case of this situation, it is best to install a filter on the pipe before the valve to ensure that the media passed.
With the positioner to use the control valve, the locator is not working properly, the gas throttling port clogging is the most common fault.
Therefore, with the locator work, you must handle the gas source, usually used by the way in the locator before the air supply line installed on the air filter pressure reducing valve.
4, increase the throttling gap method
Such as the solid particles in the media or the pipeline was washed out of the welding slag and rust and so on can not pass the throttle caused by plugging, jamming and other failures, you can switch to large throttle gap throttle - throttle area to open Windows, openings of the spool, sleeve, because of its throttle area rather than the distribution of the circumference, the fault can be easily excluded.
If it is single, double seat valve can be plunger-shaped spool to "V" shaped mouth of the spool, or into a sleeve valve.
For example, a chemical plant has a two-seat valve often stuck, it is recommended to use the sleeve valve, the problem immediately resolved.
5, medium scouring method
The use of the media itself, the erosion of energy, erosion and easy to easily precipitate, easy to plug things, thereby enhancing the valve anti-blocking function.
Media scouring method common methods are:
1) to flow closure type;
2) the use of streamlined valve body;
3) the throttle placed in the most powerful erosion, the use of this method should pay attention to improve the erosion of the material erosion resistance.
http://dragon-pump.blogspot.hk/
6, straight to the corner method
Straight through the inverted S flow, the flow of complex, upper and lower cavity dead zone, for the precipitation of the media to provide a place. Angular connection, the media is like flowing through the 90 ℃ elbow, scouring performance is good, dead zone is small, easy to design streamline. Therefore, the use of through the control valve to produce a slight plug can be changed into angular valve use.
1, cleaning method
Pipe slag, rust, slag and so on in the throttle, guide parts, the lower valve cover hole caused by blocking or stuck to the spool surface, the guide surface to produce strain and scratches, sealing surface indentation Wait. This often occurs in the new commissioning system and overhaul after the initial operation. This is the most common fault.
In this case, you must disengage the cleaning, remove the slag, such as the sealing surface should be damaged should also be grinding; at the same time to open the plug to flush out from the balance hole into the lower valve cover slag, Rinse. Before putting into operation, let the control valve fully open, the media flow for some time and then into the normal operation.
2, external scouring method
For some easy to precipitate, containing solid particles of the medium using ordinary valve adjustment, often in the throttle, the direction of the block, the bottom of the valve cover at the plug at the external flush gas and steam.
When the valve is blocked or jammed, open the external gas or steam valve, you can not move the valve in the case of the completion of the rinse work, the valve normal operation.click to visit Boiler feedwater pump manufacturer to know more.
3, install the pipe filter method
The small diameter of the control valve, especially the ultra-small flow control valve, the throttling gap is small, the media can not have a little bit of slag.
In case of this situation, it is best to install a filter on the pipe before the valve to ensure that the media passed.
With the positioner to use the control valve, the locator is not working properly, the gas throttling port clogging is the most common fault.
Therefore, with the locator work, you must handle the gas source, usually used by the way in the locator before the air supply line installed on the air filter pressure reducing valve.
4, increase the throttling gap method
Such as the solid particles in the media or the pipeline was washed out of the welding slag and rust and so on can not pass the throttle caused by plugging, jamming and other failures, you can switch to large throttle gap throttle - throttle area to open Windows, openings of the spool, sleeve, because of its throttle area rather than the distribution of the circumference, the fault can be easily excluded.
If it is single, double seat valve can be plunger-shaped spool to "V" shaped mouth of the spool, or into a sleeve valve.
For example, a chemical plant has a two-seat valve often stuck, it is recommended to use the sleeve valve, the problem immediately resolved.
5, medium scouring method
The use of the media itself, the erosion of energy, erosion and easy to easily precipitate, easy to plug things, thereby enhancing the valve anti-blocking function.
Media scouring method common methods are:
1) to flow closure type;
2) the use of streamlined valve body;
3) the throttle placed in the most powerful erosion, the use of this method should pay attention to improve the erosion of the material erosion resistance.
http://dragon-pump.blogspot.hk/
6, straight to the corner method
Straight through the inverted S flow, the flow of complex, upper and lower cavity dead zone, for the precipitation of the media to provide a place. Angular connection, the media is like flowing through the 90 ℃ elbow, scouring performance is good, dead zone is small, easy to design streamline. Therefore, the use of through the control valve to produce a slight plug can be changed into angular valve use.
2017年5月22日星期一
Vertical Pipeline Sewage Pumps How to Replace Mechanical Seals Properly
Vertical Pipeline Sewage Pumps How to Replace Mechanical Seals Properly
First, the vertical pipeline sewage pump to ensure the quality of parts
Vertical pipe sewage pump mechanical seal in the factory to be done before the sealing performance test, and a certificate. Mechanical seal after long-term operation, so that the dynamic ring and static ring wear, spring and shaft corrosion wear and tear, seal apron wear, aging, deformation, etc., can cause leakage of the seal, must repair or replace the new pieces. The sealing surface of the moving ring and the static ring shall not have cracks, corners, scratches, pits, burrs and partial grinding, scratches, pits can not penetrate the entire sealing face. If the use of the repair of the static and dynamic ring, the dynamic ring of the height of the boss and not less than 3mm, and a single height of not less than lmm, so as not to affect the heat. After the installation of the dynamic ring should be able to ensure flexible movement on the axis, the ring will be able to spring after the spring to spring back to keep the static and dynamic ring vertical and parallel. Static and dynamic ring seal apron specifications in line with the provisions of the drawings, the surface shall not be damaged, uneven thickness and soft and hard uneven phenomenon, in the overhaul to replace the seal apron. The outer surface of the spring is clean and free from corrosion. The length of the spring should be subjected to length profile inspection and pressure test. The pressure difference of each set of springs in the specified compression length should meet the requirements. The pressure error of each set of springs in the specified compression length meets the requirements. Free length tolerance of not more than 0.5mm, the amount of compression can not be too large or too small, the required error ± 2mm. The same type of material can not be used for the sealing sleeve and the pump shaft. The parallelism tolerance of both sides of the end face and the tolerance of the straightness of the axis do not exceed ± 0.20mm.
Second, the vertical pipeline sewage pump to ensure adequate cooling and lubrication
Adjust the opening of the cooling line control valve to ensure that the mechanical seal cooling pipe is smooth, the tank can open the drain valve to clean the cavity gas.click this page:http://www.dragon-pump.com/
Third, the vertical pipeline sewage pump to ensure the installation accuracy
Disassembly pump mechanical seal, the static and dynamic ring to clean, and in the friction side of the face coated with a small amount of clean lubricants, to take into account the high pressure side and low pressure side, is strictly prohibited bump. Static ring gland installation force to be uniform, to prevent the pressure deviation, with the feeler check, up and down the left and right position of the deviation of not more than 0.05mm; check gland and shaft diameter with the gap, the surrounding to be uniform, Greater than 0.1ram. Install the pump mechanical seal parts of the pump shaft radial runout does not exceed 0.05mm. Put the pump cover and seal the cover before, please carefully review the mechanical seal installation positioning size, if the positioning size does not meet the requirements, can be adjusted in the axle with steel pad, but the steel pad to high accuracy, thickness difference of not more than 0.01mm The Measure the radial runout of the mechanical seal and the end face of the sealing surface to meet the requirements.
On the running of the mechanical seal, where a gland loose to move the sealing surface of the situation, the static and dynamic ring parts must be replaced, should not be re-tightened to continue to use. Because in such a loose, the original friction trajectory will change, the contact surface of the sealing performance is very easy to be destroyed.
Fourth, the vertical pipeline sewage pump to adjust the face pressure
The end face pressure is an important parameter related to the sealing performance and service life, which is related to the seal structure type, spring size and medium pressure. The end face than the pressure of the general plus bad friction vice; than the pressure is small easy to leak, often given by the manufacturer a suitable range, the end of the general pressure to take 3 ~ 6kg / cm2. Adjusting the pressure is to adjust the compression size of the spring. The free length of the spring is denoted by A, and the spring load produces the unit load when the load is k, and the required specific pressure is expressed by P, which are the parameters given by the manufacturer. After compression, the size is denoted by B, then P / A-13 = k, and 13 = A-e / k, which is the size of the spring-loaded compression. If the size of the spring after installation is too large, you can increase the thickness of the adjustment pad between the spring seat and the spring, the size is too small to reduce the adjusted thickness, adjust the thickness of the pad with a micrometer.
First, the vertical pipeline sewage pump to ensure the quality of parts
Vertical pipe sewage pump mechanical seal in the factory to be done before the sealing performance test, and a certificate. Mechanical seal after long-term operation, so that the dynamic ring and static ring wear, spring and shaft corrosion wear and tear, seal apron wear, aging, deformation, etc., can cause leakage of the seal, must repair or replace the new pieces. The sealing surface of the moving ring and the static ring shall not have cracks, corners, scratches, pits, burrs and partial grinding, scratches, pits can not penetrate the entire sealing face. If the use of the repair of the static and dynamic ring, the dynamic ring of the height of the boss and not less than 3mm, and a single height of not less than lmm, so as not to affect the heat. After the installation of the dynamic ring should be able to ensure flexible movement on the axis, the ring will be able to spring after the spring to spring back to keep the static and dynamic ring vertical and parallel. Static and dynamic ring seal apron specifications in line with the provisions of the drawings, the surface shall not be damaged, uneven thickness and soft and hard uneven phenomenon, in the overhaul to replace the seal apron. The outer surface of the spring is clean and free from corrosion. The length of the spring should be subjected to length profile inspection and pressure test. The pressure difference of each set of springs in the specified compression length should meet the requirements. The pressure error of each set of springs in the specified compression length meets the requirements. Free length tolerance of not more than 0.5mm, the amount of compression can not be too large or too small, the required error ± 2mm. The same type of material can not be used for the sealing sleeve and the pump shaft. The parallelism tolerance of both sides of the end face and the tolerance of the straightness of the axis do not exceed ± 0.20mm.
Second, the vertical pipeline sewage pump to ensure adequate cooling and lubrication
Adjust the opening of the cooling line control valve to ensure that the mechanical seal cooling pipe is smooth, the tank can open the drain valve to clean the cavity gas.click this page:http://www.dragon-pump.com/
Third, the vertical pipeline sewage pump to ensure the installation accuracy
Disassembly pump mechanical seal, the static and dynamic ring to clean, and in the friction side of the face coated with a small amount of clean lubricants, to take into account the high pressure side and low pressure side, is strictly prohibited bump. Static ring gland installation force to be uniform, to prevent the pressure deviation, with the feeler check, up and down the left and right position of the deviation of not more than 0.05mm; check gland and shaft diameter with the gap, the surrounding to be uniform, Greater than 0.1ram. Install the pump mechanical seal parts of the pump shaft radial runout does not exceed 0.05mm. Put the pump cover and seal the cover before, please carefully review the mechanical seal installation positioning size, if the positioning size does not meet the requirements, can be adjusted in the axle with steel pad, but the steel pad to high accuracy, thickness difference of not more than 0.01mm The Measure the radial runout of the mechanical seal and the end face of the sealing surface to meet the requirements.
On the running of the mechanical seal, where a gland loose to move the sealing surface of the situation, the static and dynamic ring parts must be replaced, should not be re-tightened to continue to use. Because in such a loose, the original friction trajectory will change, the contact surface of the sealing performance is very easy to be destroyed.
Fourth, the vertical pipeline sewage pump to adjust the face pressure
The end face pressure is an important parameter related to the sealing performance and service life, which is related to the seal structure type, spring size and medium pressure. The end face than the pressure of the general plus bad friction vice; than the pressure is small easy to leak, often given by the manufacturer a suitable range, the end of the general pressure to take 3 ~ 6kg / cm2. Adjusting the pressure is to adjust the compression size of the spring. The free length of the spring is denoted by A, and the spring load produces the unit load when the load is k, and the required specific pressure is expressed by P, which are the parameters given by the manufacturer. After compression, the size is denoted by B, then P / A-13 = k, and 13 = A-e / k, which is the size of the spring-loaded compression. If the size of the spring after installation is too large, you can increase the thickness of the adjustment pad between the spring seat and the spring, the size is too small to reduce the adjusted thickness, adjust the thickness of the pad with a micrometer.
What are the factors that affect the boiler feed pump power?
In practice, there are often unreasonable phenomena: one situation is that the power rate reserve factor is chosen to be too small to overload the power machine, the boiler feed water pump unit can not run normally, and even the power machine has the risk of burning, and the other is the power The standby factor is too large, the power load is insufficient, and the performance of the power machine can not be fully utilized. The power and power factor of the power machine can be reduced, which will increase the power consumption and cause no waste.
In view of the above problems, this paper gives the expression of the reliability of the reliability of the operation of the pump unit from the angle of the operation of the pump and the power machine. The standby ratio of the power rate and the reliability of the unit operation are established, and the probability statistical method is established The calculation model of the reliability of the pump unit is given, and a practical calculation method is given, which provides a scientific basis for the reasonable matching of the pump and the power machine. For the water pump type and the different power rate reserve factor, the pump unit is reliable The calculation results are analyzed and the valuable conclusions are drawn.
Factors affecting the power of the boiler feed pump:
1, the boiler pump itself is the most fundamental impact of power. The same operating conditions of the pump, the power can be a difference of more than 15%.
2, the boiler pump operating conditions lower than the pump's additional conditions, low pump efficiency, high energy consumption.
3, the motor power in the use of simply insist on the same. It is therefore important to pick a high-power motor.
4, the impact of boiler power is mainly concerned with the quality of the description and production. Pump selected, the latter part of the impact of smaller.
5, hydraulic loss includes hydraulic conflict and some resistance loss. Boiler pump running time, inevitably the formation of impeller and guide vane and other parts of the appearance of wear and tear, increased hydraulic loss, reduced hydraulic power.
6, the boiler pump volume loss, also known as missing leaks, including impeller seal ring, interstage, axial force balance organization three leaks lost. Volume of the power of the bump is not only related to the description of the production, but also with the later processing. After a continuous operation of the pump, because the conflict between the various components, the gap increases, the volume of power reduced.
7, because the filter cylinder blockage, pipeline intake and other reasons to form a centrifugal pump pumping and idle.
8, the boiler pump before the start, the workers do not pay attention to the centrifugal boiler pump before the start of the preparatory work, warm pump, disk pump, irrigation pump and other basic operating procedures to perform incomplete, often the formation of pump cavitation, resulting in pump noise, , Low pump efficiency.
The general boiler pump is designed to achieve the highest power, that is, the boiler boiler hydraulic layout parameter is the best combination of the highest power. For other pumps, this type of pump with special requirements can not go beyond the same period of boiler power. Other pump power below the boiler pump is the primary reason for their over-current channel widened. The value of the power reduction is primarily related to the degree of widening. Other pump runner widening is to avoid clogging. IS, IH-type boiler pump for the delivery of water or physical and chemical properties similar to other liquids used in water.
In view of the above problems, this paper gives the expression of the reliability of the reliability of the operation of the pump unit from the angle of the operation of the pump and the power machine. The standby ratio of the power rate and the reliability of the unit operation are established, and the probability statistical method is established The calculation model of the reliability of the pump unit is given, and a practical calculation method is given, which provides a scientific basis for the reasonable matching of the pump and the power machine. For the water pump type and the different power rate reserve factor, the pump unit is reliable The calculation results are analyzed and the valuable conclusions are drawn.
Factors affecting the power of the boiler feed pump:
1, the boiler pump itself is the most fundamental impact of power. The same operating conditions of the pump, the power can be a difference of more than 15%.
2, the boiler pump operating conditions lower than the pump's additional conditions, low pump efficiency, high energy consumption.
3, the motor power in the use of simply insist on the same. It is therefore important to pick a high-power motor.
4, the impact of boiler power is mainly concerned with the quality of the description and production. Pump selected, the latter part of the impact of smaller.
5, hydraulic loss includes hydraulic conflict and some resistance loss. Boiler pump running time, inevitably the formation of impeller and guide vane and other parts of the appearance of wear and tear, increased hydraulic loss, reduced hydraulic power.
6, the boiler pump volume loss, also known as missing leaks, including impeller seal ring, interstage, axial force balance organization three leaks lost. Volume of the power of the bump is not only related to the description of the production, but also with the later processing. After a continuous operation of the pump, because the conflict between the various components, the gap increases, the volume of power reduced.
7, because the filter cylinder blockage, pipeline intake and other reasons to form a centrifugal pump pumping and idle.
8, the boiler pump before the start, the workers do not pay attention to the centrifugal boiler pump before the start of the preparatory work, warm pump, disk pump, irrigation pump and other basic operating procedures to perform incomplete, often the formation of pump cavitation, resulting in pump noise, , Low pump efficiency.
The general boiler pump is designed to achieve the highest power, that is, the boiler boiler hydraulic layout parameter is the best combination of the highest power. For other pumps, this type of pump with special requirements can not go beyond the same period of boiler power. Other pump power below the boiler pump is the primary reason for their over-current channel widened. The value of the power reduction is primarily related to the degree of widening. Other pump runner widening is to avoid clogging. IS, IH-type boiler pump for the delivery of water or physical and chemical properties similar to other liquids used in water.
2017年5月11日星期四
The installation method and inspection method of pump pipe and drive shaft of deep well submersible pump
What is the installation method and inspection method of pump tubing and drive shaft of deep well submersible pump?welcome to wholesale qj deep well submersible pump.
Deep well submersible pumps are installed as follows:
① lift the pump under the short tube, hanging on the board should be sliding on the board or with a rope to lift the end of the tube, so that it does not contact with other objects to protect the pipe end thread from damage. When lifting the pump pipe, apply the rope to tighten the drive shaft so that it does not fall. Do not use the hand drive shaft to prevent the transmission shaft from bending.
② After lifting the pump tube, it should be on the same axis as the pump section. The end of the shaft shaft rotation in the pump section of the shaft end of the thread, the shaft should be spin to the middle of the distal end of the shaft, and add a very small amount of lubricating oil for lubrication purposes, excessive lubricants will bring harm to the rubber bearings. Slightly lower the pump tubing, loosen the drive shaft to fasten the rope and screw the shaft end of the drive shaft into the axle section mounted on the shaft end of the pump until the two drive shaft ends are in contact with each other. Down the pump tube, the pump pipe screw into the pump section tube, with a chain clamp tightening.
Slightly lift the pumped parts and release the lower splint and carefully lift the pump into the well until the pipe clamp rests on the square.
③ In accordance with the above method, the pump pipe and the drive shaft are installed on a row-by-block basis until the pump tubing is installed.
Vertical Deep well submersible pump inspection method:
Inspection of pump tubing and pump shaft installation In order to ensure the installation quality of pump tubing and pump shaft, the position of the drive shaft and the length of the drive shaft protruding from the tube bundle should be checked step by step in the installation of each pump and pump shaft If the drive shaft is not deformed by external force, its position should be on the center line of the pump pipe. According to the length of the drive shaft out of the tube dome, it can be determined whether the end of the drive shaft and the pump pipe end face are closely connected The
You can also check the following: After each pump tubing and drive shaft is installed, you can use the tool (or by means of a tool) to rotate the drive shaft to see if it can be turned. If the installation of a sudden feeling of the drive shaft after the friction increased more, or even difficult to turn, indicating that the pump tube and drive shaft is not installed, it should be opened, check the reasons after the re-install until the request so far The
Deep well submersible pumps are installed as follows:
① lift the pump under the short tube, hanging on the board should be sliding on the board or with a rope to lift the end of the tube, so that it does not contact with other objects to protect the pipe end thread from damage. When lifting the pump pipe, apply the rope to tighten the drive shaft so that it does not fall. Do not use the hand drive shaft to prevent the transmission shaft from bending.
② After lifting the pump tube, it should be on the same axis as the pump section. The end of the shaft shaft rotation in the pump section of the shaft end of the thread, the shaft should be spin to the middle of the distal end of the shaft, and add a very small amount of lubricating oil for lubrication purposes, excessive lubricants will bring harm to the rubber bearings. Slightly lower the pump tubing, loosen the drive shaft to fasten the rope and screw the shaft end of the drive shaft into the axle section mounted on the shaft end of the pump until the two drive shaft ends are in contact with each other. Down the pump tube, the pump pipe screw into the pump section tube, with a chain clamp tightening.
Slightly lift the pumped parts and release the lower splint and carefully lift the pump into the well until the pipe clamp rests on the square.
③ In accordance with the above method, the pump pipe and the drive shaft are installed on a row-by-block basis until the pump tubing is installed.
Vertical Deep well submersible pump inspection method:
Inspection of pump tubing and pump shaft installation In order to ensure the installation quality of pump tubing and pump shaft, the position of the drive shaft and the length of the drive shaft protruding from the tube bundle should be checked step by step in the installation of each pump and pump shaft If the drive shaft is not deformed by external force, its position should be on the center line of the pump pipe. According to the length of the drive shaft out of the tube dome, it can be determined whether the end of the drive shaft and the pump pipe end face are closely connected The
You can also check the following: After each pump tubing and drive shaft is installed, you can use the tool (or by means of a tool) to rotate the drive shaft to see if it can be turned. If the installation of a sudden feeling of the drive shaft after the friction increased more, or even difficult to turn, indicating that the pump tube and drive shaft is not installed, it should be opened, check the reasons after the re-install until the request so far The
Boiler water pump how to calculate the head
Heating and Closed Circulation System of the water pump head = water supply head to fill the point of the pressure head - the supply tank water level + replenishment pipeline itself along the head and the local head loss and the sum.
Boiler water pump flow and head calculation formula:
The effective energy obtained by the unit weight of the liquid flowing through the pump. Is the pump's important performance parameters, also known as pressure head. Can be expressed as the pressure of the fluid head, kinetic energy head and bit energy head increases, that is
H = (p2 - p1) / ρg + (c2 ^ 2 - c1 ^ 2) / 2g + z2 - z1
Where H - head, m;
P1, p2 - pump inlet and outlet of the liquid pressure, Pa;
C1, c2 - fluid at the pump inlet and outlet flow rate, m / s;
Z1, z2 - import and export height, m;
Ρ - liquid density, kg / m3;
G - gravity acceleration, m / s2.
Replenishment pumps and feed pumps are calculated in the same way. The flow rate of the replenishment pump Q is determined by the need, that is, the amount of boiler water per unit time.
The head of the replenishment pump is determined by the height of the water, the head of the boiler pressure, and the loss of the head along the pipeline and the head loss. The pipe length is L, the resistance coefficient is k, the resistance coefficient is j, the height of water is Z, the boiler pressure is P, the density of water is p, and the acceleration of gravity is expressed by g, then the water pump head: H = Z + P / (pg) + (kL / D) V ^ 2 / (2g) + jV ^ 2 / (2g) where the average velocity V = 4Q / (3.14D ^ 2) and D is the tube diameter. For the circulating pump, the flow of course depends on the need, the flow is determined, calculate the total return of the loop is the head of the water pump head.
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Boiler water pump flow and head calculation formula:
The effective energy obtained by the unit weight of the liquid flowing through the pump. Is the pump's important performance parameters, also known as pressure head. Can be expressed as the pressure of the fluid head, kinetic energy head and bit energy head increases, that is
H = (p2 - p1) / ρg + (c2 ^ 2 - c1 ^ 2) / 2g + z2 - z1
Where H - head, m;
P1, p2 - pump inlet and outlet of the liquid pressure, Pa;
C1, c2 - fluid at the pump inlet and outlet flow rate, m / s;
Z1, z2 - import and export height, m;
Ρ - liquid density, kg / m3;
G - gravity acceleration, m / s2.
Replenishment pumps and feed pumps are calculated in the same way. The flow rate of the replenishment pump Q is determined by the need, that is, the amount of boiler water per unit time.
The head of the replenishment pump is determined by the height of the water, the head of the boiler pressure, and the loss of the head along the pipeline and the head loss. The pipe length is L, the resistance coefficient is k, the resistance coefficient is j, the height of water is Z, the boiler pressure is P, the density of water is p, and the acceleration of gravity is expressed by g, then the water pump head: H = Z + P / (pg) + (kL / D) V ^ 2 / (2g) + jV ^ 2 / (2g) where the average velocity V = 4Q / (3.14D ^ 2) and D is the tube diameter. For the circulating pump, the flow of course depends on the need, the flow is determined, calculate the total return of the loop is the head of the water pump head.
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2017年4月21日星期五
Advantages and Disadvantages of Vertical Mixed Flow Pump
Between the centrifugal pump and axial flow pump is a pump is commonly referred to as the mixed-flow pump, in terms of speed, its order from large to small axial flow pump, mixed flow pump, centrifugal pump, under normal circumstances, Mixed flow pump than the speed of 300-500 between the vertical mixed flow pump is a mixed flow pump product type, its own advantages are many, but there are also some shortcomings, the following is to introduce you.
First, the advantages of vertical mixed-flow pump
Vertical mixed-flow pump operation is relatively simple, in general, the vertical pump impeller is submerged in the water, vertical mixed-flow pump is the case, so you can directly start, which is a vertical mixed flow pump Large features.
Vertical mixed flow pump installation area is still relatively small. But also contains the driver, including, compared with the horizontal pump, its installation area is only half of the horizontal pump.
In addition, the vertical mixed-flow pump is also conducive to prevent cavitation phenomenon. Since most of the vertical pump impeller is submerged in the water, so you can take a larger number of NPSH, so the pump running at a larger than the planning point of the flow will reduce the probability of cavitation phenomenon.
Second, the vertical mixed flow pump shortcomings
As the vertical mixed flow pump is vertical axis, so its vertical is relatively long, which makes it in the demolition, assembly time, lifting height is relatively high, so the top of the pump should have enough space to meet the smooth , Which is a vertical mixed flow pump a major drawback.
2017年4月1日星期六
Prevention of submersible sewage pump motor water coup
Taking into account the submersible sewage pump motor diving work for a long time, so the prevention of motor water is particularly important, once the motor water is likely to damage the submersible axial pump bearing and winding insulation, burn the motor, not only increase the maintenance time and maintenance costs, Also delayed the normal work. It can be seen that the prevention of water intake is the key to ensuring that the motor is sealed. Reasonable prevention of submersible sewage pump motor water.
(1) regularly check the pump motor winding on the ground insulation resistance. Regular inspection of the insulation resistance of the pump motor windings, the value should be greater than the different temperature of the submersible axial pump insulation value requirements, or should be disassemble maintenance, if the water to be dry, and should check whether the ground is strong.
(2) check the oil chamber sealing situation. Sewage pump in the prescribed medium after six months, should check the oil chamber sealing situation, such as oil found in water submersible axial pump or milk emulsion, according to the provisions of cleaning the oil room, if necessary, replace the mechanical seal, Conditions of the poor use of the sewage pump should be routinely overhauled. If the oil after the operation of a very short time to leak the probe that alarm, mechanical maintenance should be overhauled, such as mechanical seal damage, should be replaced or overhaul.
(3) Check whether there is a leak in the service seal. Submerged pump leakage failure, mostly due to the aging of the sealing device, due to wear, then replace the new seal can achieve the purpose of preventing water.
(4) Check if the leaky probe is out of order. Leakage probe failure, generally because the drain probe wire blown, overhaul the first leaky probe diving axial pump copper tube filled with epoxy resin filler, and then put the lead wire connected to each lead wire conductive And insulated from each other, and finally in the copper tube pouring epoxy resin, so to re-create a leaky probe. The lead wire on the probe is firmly connected with bolts and leads to the external junction box with the motor power cord, which ensures effective monitoring of the water intake problem.
(1) regularly check the pump motor winding on the ground insulation resistance. Regular inspection of the insulation resistance of the pump motor windings, the value should be greater than the different temperature of the submersible axial pump insulation value requirements, or should be disassemble maintenance, if the water to be dry, and should check whether the ground is strong.
(2) check the oil chamber sealing situation. Sewage pump in the prescribed medium after six months, should check the oil chamber sealing situation, such as oil found in water submersible axial pump or milk emulsion, according to the provisions of cleaning the oil room, if necessary, replace the mechanical seal, Conditions of the poor use of the sewage pump should be routinely overhauled. If the oil after the operation of a very short time to leak the probe that alarm, mechanical maintenance should be overhauled, such as mechanical seal damage, should be replaced or overhaul.
(3) Check whether there is a leak in the service seal. Submerged pump leakage failure, mostly due to the aging of the sealing device, due to wear, then replace the new seal can achieve the purpose of preventing water.
(4) Check if the leaky probe is out of order. Leakage probe failure, generally because the drain probe wire blown, overhaul the first leaky probe diving axial pump copper tube filled with epoxy resin filler, and then put the lead wire connected to each lead wire conductive And insulated from each other, and finally in the copper tube pouring epoxy resin, so to re-create a leaky probe. The lead wire on the probe is firmly connected with bolts and leads to the external junction box with the motor power cord, which ensures effective monitoring of the water intake problem.
Submersible sewage pump used in the process of five "can not"
Submersible sewage pump in the course of the failure may be caused by the use of improper maintenance, such failures can be completely avoided, which requires you to use the process of diving axial flow pump to grasp the basic knowledge of the use of submersible sewage pump, as far as possible Reduce the human problem caused by the fault. Summed up the use of diving sewage pump in the five "no", I hope to help you.
First, the submersible sewage pump can not be dehydrated operation. Submersible sewage pump in the anhydrous test run, the time shall not exceed 5 minutes. In the pumping process, if the water level is declining should pay attention to not let the pump body exposed to work.
Second, the submersible sewage pump can not start immediately after shutdown. After the shutdown can not start immediately, you must wait for the tube after the return of water to start before starting. If the start diving axial pump can not be water, should immediately stop to identify the cause.
Third, into the water or put forward the water can not pull the cable. Submersible sewage pump into the water or put forward the water, you must pull the rope, absolutely can not pull the cable. If you want to carry, disassemble or carry out maintenance should first cut off the power.
Fourth, into the water when not lying. Diving sewage pump diving depth is generally 0.5 to 3.0 meters, when diving into the water should be vertical lifting, can not lie, but can not fall into the mud.
Fifth, submersible sewage pump can not be used for irrigation and drainage of high water content. Submersible sewage pump should not be frequent start, not for drainage of sediment concentration Diving Axial pump higher water or mud water. Pumps can be used outside the bamboo mesh to prevent the water weeds plug the pump grid or catch the pump impeller.
First, the submersible sewage pump can not be dehydrated operation. Submersible sewage pump in the anhydrous test run, the time shall not exceed 5 minutes. In the pumping process, if the water level is declining should pay attention to not let the pump body exposed to work.
Second, the submersible sewage pump can not start immediately after shutdown. After the shutdown can not start immediately, you must wait for the tube after the return of water to start before starting. If the start diving axial pump can not be water, should immediately stop to identify the cause.
Third, into the water or put forward the water can not pull the cable. Submersible sewage pump into the water or put forward the water, you must pull the rope, absolutely can not pull the cable. If you want to carry, disassemble or carry out maintenance should first cut off the power.
Fourth, into the water when not lying. Diving sewage pump diving depth is generally 0.5 to 3.0 meters, when diving into the water should be vertical lifting, can not lie, but can not fall into the mud.
Fifth, submersible sewage pump can not be used for irrigation and drainage of high water content. Submersible sewage pump should not be frequent start, not for drainage of sediment concentration Diving Axial pump higher water or mud water. Pumps can be used outside the bamboo mesh to prevent the water weeds plug the pump grid or catch the pump impeller.
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