2016年12月30日星期五
2016年12月29日星期四
The main features of stainless steel sewage pump without clogging
The main features of stainless steel sewage pump without clogging
Pump compact, small size, easy to move, easy to install, no need to build the pump house, diving into the water to work, greatly reducing the project cost. Pump oil room with oil and water probe, when the pump side of the mechanical seal is damaged, the water into the oil chamber, the probe signal, the implementation of protection of the pump. According to the needs of users with automatic safety control cabinet, the pump leakage, leakage, overload and over-temperature monitoring, to ensure reliable and safe operation of the pump. Dual rail automatic coupling installation system, to the installation of the pump installation, maintenance has brought great convenience, people do not have to go out of the sump for this purpose. Float switch can change according to the required water level. Automatic control of the pump stops, no special care. In the use of head to ensure that the motor is running within the overload. According to the use of motor can be used outside the third-party water cooling system, to ensure that the pump in the dry (dry) state of safe operation. Installation of a fixed automatic coupling installation and mobile free installation of two, to meet the different use of occasions.
Pump compact, small size, easy to move, easy to install, no need to build the pump house, diving into the water to work, greatly reducing the project cost. Pump oil room with oil and water probe, when the pump side of the mechanical seal is damaged, the water into the oil chamber, the probe signal, the implementation of protection of the pump. According to the needs of users with automatic safety control cabinet, the pump leakage, leakage, overload and over-temperature monitoring, to ensure reliable and safe operation of the pump. Dual rail automatic coupling installation system, to the installation of the pump installation, maintenance has brought great convenience, people do not have to go out of the sump for this purpose. Float switch can change according to the required water level. Automatic control of the pump stops, no special care. In the use of head to ensure that the motor is running within the overload. According to the use of motor can be used outside the third-party water cooling system, to ensure that the pump in the dry (dry) state of safe operation. Installation of a fixed automatic coupling installation and mobile free installation of two, to meet the different use of occasions.
2016年12月28日星期三
Stainless steel sewage pump performance and advantages
Stainless steel sewage pump use stainless steel to meet the corrosive media occasions, no clogging, automatic coupling installation, equipped with motor monitoring system, with leakage protection. Stainless steel sewage pump performance and advantages are as follows:
1, WQF stainless steel sewage pump with stainless steel design, by the pump, seal, the motor is composed of three parts. Motor is located in the upper part of the pump, single-phase or three-phase asynchronous motor structure, the pump is located in the lower part of the motor, the use of water-absorbing structure, can prevent the pump into sludge clogging phenomenon. Shape and precision casting stainless steel barrel, nice, with rust-proof, corrosion-resistant, non-polluting and so on. Widely used in a variety of special requirements such as chemical, marine aquaculture, food and beverage use occasions.
2, the overall structure of the pump is compact, small size, light weight, easy maintenance, diving liquid can be used. The electric pump is equipped with overheat current protector to prevent the motor from overheating due to overload.
3, double-mechanical seal mechanical seal device, with a reliable seal the use of security features. Seals and cables according to medium conditions using corrosion-resistant fluorine rubber, safety and health.
1, WQF stainless steel sewage pump with stainless steel design, by the pump, seal, the motor is composed of three parts. Motor is located in the upper part of the pump, single-phase or three-phase asynchronous motor structure, the pump is located in the lower part of the motor, the use of water-absorbing structure, can prevent the pump into sludge clogging phenomenon. Shape and precision casting stainless steel barrel, nice, with rust-proof, corrosion-resistant, non-polluting and so on. Widely used in a variety of special requirements such as chemical, marine aquaculture, food and beverage use occasions.
2, the overall structure of the pump is compact, small size, light weight, easy maintenance, diving liquid can be used. The electric pump is equipped with overheat current protector to prevent the motor from overheating due to overload.
3, double-mechanical seal mechanical seal device, with a reliable seal the use of security features. Seals and cables according to medium conditions using corrosion-resistant fluorine rubber, safety and health.
Stainless steel sewage pump how to choose?
how to choose Stainless steel sewage pump?1. Grasp whether the situation is in line with the conditions of use (voltage, frequency, water quality, power capacity, etc.).
2. Select the pump specifications:
1) The initial choice of flow: According to the demand to determine the pump flow.
2) determine the pipeline: According to the transport medium to calculate the critical settlement flow rate, a reasonable choice of pipe diameter.
3) pipeline loss calculation: According to pipe length and elbow, the number of valves to calculate pipeline losses.
4) Pump head calculation: pump head = vertical difference between the surface of the water to the outlet + pipe loss + outlet pressure + safety margin (10%).
5) to determine the installation: fixed, mobile.
6) According to the flow head to determine the pump model
2. Select the pump specifications:
1) The initial choice of flow: According to the demand to determine the pump flow.
2) determine the pipeline: According to the transport medium to calculate the critical settlement flow rate, a reasonable choice of pipe diameter.
3) pipeline loss calculation: According to pipe length and elbow, the number of valves to calculate pipeline losses.
4) Pump head calculation: pump head = vertical difference between the surface of the water to the outlet + pipe loss + outlet pressure + safety margin (10%).
5) to determine the installation: fixed, mobile.
6) According to the flow head to determine the pump model
Stainless steel sewage pump how to prevent sand?
Most stainless steel submersible sewage pump used in rural pumping groundwater homework, but at the time of users to use diving sewage pump, the groundwater is sucking up at the same time also can be caused by sand stuck submersible sewage pump can't work normal. So, how to prevent the use of submersible sewage pump when the sand is sucked up?
In order to prevent sand in the use of submersible sewage pump was drawn up, we usually put sand in the pump body put gauze net or circumference, so that it can be good when pumping groundwater was sucking up to prevent sand.
In order to solve the problem of sand control of diving sewage pump, we put sand in the diving sewage pump pump body, at the same time in order not to impact on water, sand control net sand control mesh can not be too small. But, in the case of sand control mesh is bigger, diving sewage pump also cannot very good sand control effect, so Shanghai speed can also recommend wai on spinning cloth on pump body, like diving sewage pump not only had the effect of sand control, and at the same time it mesh density is very close, and on the small water pump. In this way, can very good to achieve the objective of the sand control.
Characteristics and Application of Stainless Steel Sewage Pump
The characteristics of the stainless steel pump, and the use scope is as follows:
Stainless steel non-clog sewage pump with single phase (3) power supply, the whole stainless steel structure, corrosion resistance (PH 4 ~ 10). Equipped with cutting device, can cut off the long fiber, debris, sewage capability is strong, can through the larger particle diameter of dirt, debris, suitable for sewage contamination transport and emissions. WQ type diving sewage pump easy to use, widely used, should not be limited by the scope and conditions of use, especially suitable for frequently moving or temporary urgent need.
Stainless steel sewage pump without fixed installation, as long as the set of rubber hose or tube is connected, put the bottom the pump handle, but it must be with security control box, to ensure safety. Energy saving effect is remarkable, winding, no blockage prevention etc, solid particles and long fiber waste in lining, has a unique effect.
Selection Principle of Stainless Steel Sewage Pump
Stainless steel sewage pump selection principles are described below:
1, for different water quality to choose the right stainless steel sewage pump: a relatively different water quality is actually a different corresponding to the submersible pump, a special pumping of water, special pumping sewage water, specifically pumping concentration.
2, the election of the pump type, you have to consider the parameters of the pump is: caliber, flow, head, power, voltage. This should be noted that the water temperature, the use of conventional stainless steel submersible pump temperature of 10-40 degrees, more than 60 degrees when we should note that Zi-chuen, high temperature water for the company's research and high temperature of 120 degrees clean water pumps and sewage pumps .
3, stainless steel sewage pump material selection: the use of different media of different grades of stainless steel, 201,304,316,316 L.
4, the pump structure: the import and export of different pumps, under the water on the side of the super-water, the water on the water. There are vertical installation and horizontal installation. Outlet with a head, threaded connection or flange. Flanges have national standard and non-target.
1, for different water quality to choose the right stainless steel sewage pump: a relatively different water quality is actually a different corresponding to the submersible pump, a special pumping of water, special pumping sewage water, specifically pumping concentration.
2, the election of the pump type, you have to consider the parameters of the pump is: caliber, flow, head, power, voltage. This should be noted that the water temperature, the use of conventional stainless steel submersible pump temperature of 10-40 degrees, more than 60 degrees when we should note that Zi-chuen, high temperature water for the company's research and high temperature of 120 degrees clean water pumps and sewage pumps .
3, stainless steel sewage pump material selection: the use of different media of different grades of stainless steel, 201,304,316,316 L.
4, the pump structure: the import and export of different pumps, under the water on the side of the super-water, the water on the water. There are vertical installation and horizontal installation. Outlet with a head, threaded connection or flange. Flanges have national standard and non-target.
The use of stainless steel sewage pump condition
The use of stainless steel sewage pump conditions:
1, stir diving sewage pump series products in the rated voltage of 380 v, the power frequency 50 hz when applicable;
2, medium has more than 40 degrees Celsius temperature, medium density 1150 kg/m3, or less between the PH value in the range of 5 and 9;
3, height is not more than 1000 meters above sea level;
4, medium viscosity is not super 1000 cp;
5, products work runtime must be completely into the water, but not more than 10 m diving depth;
6, products mainly for cast iron material, can not be used in strong corrosive or contain strong corrosive medium;
Note: in the selection or installation prior to using the actual conditions of use to the terms of the above pump to ensure the proper use of products!
2016年12月27日星期二
How to prolong the service life of mixed flow pump
To agricultural irrigation time, in order to help the broad masses of farmers friend with good mixed flow pump, we sort out seven details, if the broad masses of farmers friend do a good job in the seven details that not only can prolong the service life of mixed flow pump, also can promote the performance of mixed flow pump. After stopping for a long time, before using the pump shell, to prevent rust cannot start, burn out motor; 4, drying machine; 5, to ensure the sealing.
Suction chamber and water chamber pressure come from hydraulics Angle division of the two different functional components, is also a necessary component of mixed flow pump. Suction chamber and water chamber pressure at work is not rotating permanent parts. For single-stage single-suction mixed flow pump, the suction chamber and pressurized water chamber is usually connected into a whole, namely the formation of pump body, or the pump shell. Pump body inner cavity is composed of suction chamber and pressure water chamber.
Mixed flow pump of the pump shaft is adopted some some very advanced production technology, production, and it is also the most advanced production equipment selection, the most sophisticated production equipment, thus ensuring the pump shaft and even the whole mixed flow pump with good quality. And of the mixed flow pump bearing chooses is some thin oil for lubrication.
Commonly used farmland irrigation and drainage pump
Mixed flow pump after the prime mover impeller rotates, centrifugal force and the function of the liquid axial thrust, is a combination of centrifugal pumps and axial flow pump, liquid oblique flow impeller. So it is a pump between centrifugal pumps and axial flow pump. Mixed flow pump specific speed centrifugal pump prep above, below the axial flow pump, generally between 300-500. Its head is higher than axial flow pump, but traffic is smaller than axial flow pump, is bigger than a centrifugal pump.
Mixed flow pump is pumping station in the flow of the main equipment and upgrade the water, in water supply and drainage engineering in towns and industrial enterprises, extensive use of the water pump vane pump, and the centrifugal pump in the most common. Mixed flow pump, the pumping principle of high-speed rotating impeller, both generate centrifugal force of the centrifugal pump, but also the lift of the axial flow pump, mixed-flow pump by these two kinds of force and pumping on the mixing action.
Axial flow pump has commonly 2 ~ 6 piece of space warp shaped blades. According to the fixed way on the blade in the wheel hub, can be divided into fixed, half adjustment type and whole adjustment type 3 kinds. Fixed axial flow pump blades and hub body is cast, or use the link is fixed on the wheel load, so the blade installation Angle is shown in figure 2-20 half adjustment blade figure can't adjustment.
2016年12月26日星期一
2016年12月23日星期五
2016年12月22日星期四
2016年12月21日星期三
Why use the deep well pump to pre-water?
In the deep well water pump shaft along the bearing points are equipped with plastic bearings and rubber bearing like bracket, with support from it, it cat to water lubrication. In order to facilitate the start and reduce the friction between the shaft and the rubber bearing, in the start before the use of water lubrication. Such as the absence of water lubrication, such as rubber bearings and transmission shaft between the dry friction, heat deterioration, resulting in difficult starting or starting power increases, serious, there will be axle accident, the connecting parts loose and damaged.
Pre-lubricated bearings like the use of non-sediment-free water without oil. Can pot or poke from the pump irrigation mouth filling, add the amount of water from the static depth of the water level, water pipe thickness, deep well pump speed and other factors. When the water level of 50-100 meters, the irrigation should not be less than 60-100 kg until the deep well pump water to stop irrigation. It is advisable to pre-lubricate with dilute soapy water prior to initial commissioning or long-term pump shutdown to improve lubrication performance.
Pre-lubricated bearings like the use of non-sediment-free water without oil. Can pot or poke from the pump irrigation mouth filling, add the amount of water from the static depth of the water level, water pipe thickness, deep well pump speed and other factors. When the water level of 50-100 meters, the irrigation should not be less than 60-100 kg until the deep well pump water to stop irrigation. It is advisable to pre-lubricate with dilute soapy water prior to initial commissioning or long-term pump shutdown to improve lubrication performance.
Safety operating rules for deep well water pumps
1) deep well water pump should be used in the sand content of less than 0.01% of the clean water pump, pump room equipped with pre-run water tank, the capacity should meet the required pre-run a water run.
2) newly installed or overhauled deep well pump should adjust the clearance between the pump casing and the impeller, and the impeller shall not rub against the shell during operation.
3) deep well pump should be run before the water into the shaft and bearing shell for pre-run.
4) before the start of deep well pump, check the project should meet the following requirements:
① Base bolts are fastened.
② axial clearance to meet the requirements.Adjustment of the bolt nut has been installed.
③ packing gland has been tightened and lubricated.
④ motor bearing lubrication.
⑤ Rotate the motor by hand and stop the mechanism of the rotor are flexible and effective.
5) deep well pump shall not idle in the absence of water. Pump one, two impeller should be immersed in the water level below 1m. The water level in the well should be observed frequently during operation.
6) In operation, when found around the base of a larger vibration, should check the pump bearing or motor packing wear. When excessive wear and leakage, should replace the new pieces.
7) has been sucked, discharged through the deep mud with sand pump, before stopping the pump, the application of clean water rinse.
8) stop the pump should be closed before the water valve, cut off the power. Lock the switch box. When the winter stop. Should be put in the net pump water.
2) newly installed or overhauled deep well pump should adjust the clearance between the pump casing and the impeller, and the impeller shall not rub against the shell during operation.
3) deep well pump should be run before the water into the shaft and bearing shell for pre-run.
4) before the start of deep well pump, check the project should meet the following requirements:
① Base bolts are fastened.
② axial clearance to meet the requirements.Adjustment of the bolt nut has been installed.
③ packing gland has been tightened and lubricated.
④ motor bearing lubrication.
⑤ Rotate the motor by hand and stop the mechanism of the rotor are flexible and effective.
5) deep well pump shall not idle in the absence of water. Pump one, two impeller should be immersed in the water level below 1m. The water level in the well should be observed frequently during operation.
6) In operation, when found around the base of a larger vibration, should check the pump bearing or motor packing wear. When excessive wear and leakage, should replace the new pieces.
7) has been sucked, discharged through the deep mud with sand pump, before stopping the pump, the application of clean water rinse.
8) stop the pump should be closed before the water valve, cut off the power. Lock the switch box. When the winter stop. Should be put in the net pump water.
Bellows cut - off valve axial flow pump
Bellows cut-off valve as an axial flow pump production concept has not yet been the user awareness of the industry, compared to stainless steel ball valves, valve and other traditional valve operation is still minimal. Low-cut valve technology, low barriers to entry characteristics, but also makes the operation a permanent lack of competition, competition is heating up. At this time the bellows valve is still fresh for people to use. For the status of this job and its own talent to re-evaluate the valve manufacturer to understand the valve to be sold is not a commodity, but the brand, light visibility can not become a real top brand, the user just agree with your Brand advocates, will be a good impression on the brand and the development of loyalty. To this end he made a national security valve is the brand, and the first change from the concept, the sale of goods into the sale of the brand.
Environmental protection and energy-saving trap also has excellent prospects. Steam trap is the role of steam drainage, all with boilers and local steam are inseparable from the trap. Assuming that the trap can not drain the condensate as soon as possible, the production equipment, water, production skills, temperature will be reduced, affecting the production of power and quality of goods, in turn, assuming the trap quality is not good, even the steam to row, will constitute a lot of Steam waste. "Traps in the proportion of the valve at least, the highest level of skills, it has the greatest impact on production skills." China Silver Ball Energy Engineering Co., Ltd. Chairman Li Shenghui marked with China's economic high-speed start, a lot of preemptive production equipment, Large-scale ethylene, petrochemical, coal chemical, nuclear power plants and other high-end equipment, the introduction of the conditions of the trap needs to be very harsh, high temperature and pressure, large displacement traps, low pressure, large displacement traps growing demand , The usual trap is not satisfied with the needs of shopping malls. More and more serious in the power of the environment, energy-saving emission reduction operations to become the world's attention to the issue, high-quality traps require a lot of shopping malls. Will sell the goods into the sale of the brand, is a superb local protection valve. This is because, a high degree of brand equity for the company to bring a lot of competitive advantage. Because the user's brand awareness and loyalty of the valve is high, the company can save a lot of shopping malls marketing costs; because the user willing to buy the company's products, so in consultation with distributors and retailers in a favorable position; because the brand representative The perceived quality is high, and the firm can draw up a higher offer for the commodity than the contestant; because the brand represents a high promise, it is easy for the company to broaden the brand.
And, the brand also provides a useful way for companies to host fierce price competition. In the bellows cut valve awareness and attention is also appropriate low case, the security valve will be a wonderful user's brand image and user-friendly emotional characteristics of the transplant to the user's brain cognitive side, to broaden the base of its shopping malls together For the goods to bring a higher degree of attention. Automatic valve opening trend is the first time for domestic companies to open the key, but the domestic valve operation should be aware of automation valve exports also short of 5% of total output value, imports and total output value is appropriate, indicating that China's automation valves Of the demand gap is still not small, the goods in technology, quality and abroad there is still a great distance, but also can not fully meet the needs of domestic high-end shopping malls. Therefore, it is necessary for the valve company to firmly grasp the opportunity to open the valve automation, marching market share and the quality of goods. But the trust with the mall gradually opened up the old, the law open to sound, the future operation of the valve facing the competition environment will become more benign. And because the industry is more specialized in commodity demand and the whole society to enhance energy-saving know, the valve will open in two directions, one from a single type to multi-type and multi-standard open, the second is to open in the energy-saving direction. So the future, the valve operation will be moving in the two main decision on the choice of a full supply of valve manufacturers trend will be more and more
Environmental protection and energy-saving trap also has excellent prospects. Steam trap is the role of steam drainage, all with boilers and local steam are inseparable from the trap. Assuming that the trap can not drain the condensate as soon as possible, the production equipment, water, production skills, temperature will be reduced, affecting the production of power and quality of goods, in turn, assuming the trap quality is not good, even the steam to row, will constitute a lot of Steam waste. "Traps in the proportion of the valve at least, the highest level of skills, it has the greatest impact on production skills." China Silver Ball Energy Engineering Co., Ltd. Chairman Li Shenghui marked with China's economic high-speed start, a lot of preemptive production equipment, Large-scale ethylene, petrochemical, coal chemical, nuclear power plants and other high-end equipment, the introduction of the conditions of the trap needs to be very harsh, high temperature and pressure, large displacement traps, low pressure, large displacement traps growing demand , The usual trap is not satisfied with the needs of shopping malls. More and more serious in the power of the environment, energy-saving emission reduction operations to become the world's attention to the issue, high-quality traps require a lot of shopping malls. Will sell the goods into the sale of the brand, is a superb local protection valve. This is because, a high degree of brand equity for the company to bring a lot of competitive advantage. Because the user's brand awareness and loyalty of the valve is high, the company can save a lot of shopping malls marketing costs; because the user willing to buy the company's products, so in consultation with distributors and retailers in a favorable position; because the brand representative The perceived quality is high, and the firm can draw up a higher offer for the commodity than the contestant; because the brand represents a high promise, it is easy for the company to broaden the brand.
And, the brand also provides a useful way for companies to host fierce price competition. In the bellows cut valve awareness and attention is also appropriate low case, the security valve will be a wonderful user's brand image and user-friendly emotional characteristics of the transplant to the user's brain cognitive side, to broaden the base of its shopping malls together For the goods to bring a higher degree of attention. Automatic valve opening trend is the first time for domestic companies to open the key, but the domestic valve operation should be aware of automation valve exports also short of 5% of total output value, imports and total output value is appropriate, indicating that China's automation valves Of the demand gap is still not small, the goods in technology, quality and abroad there is still a great distance, but also can not fully meet the needs of domestic high-end shopping malls. Therefore, it is necessary for the valve company to firmly grasp the opportunity to open the valve automation, marching market share and the quality of goods. But the trust with the mall gradually opened up the old, the law open to sound, the future operation of the valve facing the competition environment will become more benign. And because the industry is more specialized in commodity demand and the whole society to enhance energy-saving know, the valve will open in two directions, one from a single type to multi-type and multi-standard open, the second is to open in the energy-saving direction. So the future, the valve operation will be moving in the two main decision on the choice of a full supply of valve manufacturers trend will be more and more
Development of axial flow pump in the next 10 years
China's axial flow pump valve with the work of petrochemical and other work continues to move, the past decade, the domestic policy and economic situation turned for the valve to provide a favorable start conditions, the rise of space is also very immeasurable. At that time, the domestic petrochemical and other equipment to face the replacement cycle and the amount of new equipment, most of the work of the valve demand immeasurable, it is estimated that in the next few years time the valve will still have a larger increase.
With the increasingly fierce competition in the valve industry in recent years will be a strong brand that brand competition for the country's valve, the valve is the era of brand competition. Competition is the quality of products, technical services and pricing and other elements of the competition, the elements of the race after all, after the end of the brand competition to brand economic strength as the background to cut the cost of shopping malls, expanding the global valve stores, will be the economy Integration of economic work under a major feature. Valve chairman Wang Jianye that the next 10 years, China's valve industry will usher in an unprecedented opportunity to open, thermal power, nuclear power, hydropower, large-scale petrochemical, oil and gas pipelines, coal liquefaction and metallurgy, water conservancy and other major projects to create supporting Valve new products, will become the key to development, key projects in these countries will lead all the high-speed increase in the valve mall. Petrochemical valve is a valve to open a very small sub-market, with the continuous advance of the global petrochemical industry, these years, petrochemical valves have been changing with each passing day. According to the US Department of Energy Information Agency estimates, in 2008 -2035, the global power consumption will increase by about 53%, and by 2035, oil and natural gas will account for the total power consumption of 52%, in the global context Crude oil needs and digging will adhere to the basic stability of the situation. "This will be the areas of oil and gas gathering valve needs to play a stronger role in supporting the increase." Shuangheng valve chairman Huang marked Italian. Large-scale investment in oil and gas pipeline will promote the industrial valves, especially large-diameter valves need to continue to expand. At that time, China's oil and natural gas consumption growth has exceeded output growth, supply and demand gap continues to expand, which also gave birth to the domestic oil and gas-related difficulties. In the future period, China will build a lot of domestic pipeline to end the import of oil and gas outside the pipeline connection, and in the country constitute a more systematic oil and gas pipeline network. Thus, this time oil and gas pipeline investment will remain at a high level, the petrochemical valve needs of the mall will also end the rapid increase.
In the modern economic and social conditions to start high-speed, automation will be the inevitable trend of social development. Therefore, it is necessary for the valve company to keep up with the social trend, in order to compete in the market in an invincible position. With the social industrial road, petrochemical and other industrial valves and other products also need to show a professional Chinese, standardized, large-scale, complete sets of trends, together with the need for energy-saving increasingly high. The valve will also be due to the integration of mechanical and electrical valves ushered in a new opportunity and turn for the first time, the need for mechanical and electrical valves on the mall began to increase, the mall is still a potential space for development, but together with the product quality and the higher the need . Valve work products into a different period, not only the product category needs to be replaced, and the company's internal management also need to work according to the norms of deepening reform. Although the work of the valve to start a more stable long-term, but there are still non-standard competition in the industry, such as some operators through the waste valve innovation, scratch oil sc paint after the first sale, to project quality serious security risks, Seriously disrupted the valve shopping mall order. Brand is the product of economic products, the brand is not only a title, an image, a convey the questions, but also a reflection of the company's various costs, the company's operations are all through the brand to convey the action. Brand is not only the company's product concept, but also the performance of the company as. Brand communication focused on the user's minds rather than the product itself, making the "cut-off valve election security" in the field of alternative products can not replace the establishment of the brand concept, which is Mingbao valve success of the base secret.
With the increasingly fierce competition in the valve industry in recent years will be a strong brand that brand competition for the country's valve, the valve is the era of brand competition. Competition is the quality of products, technical services and pricing and other elements of the competition, the elements of the race after all, after the end of the brand competition to brand economic strength as the background to cut the cost of shopping malls, expanding the global valve stores, will be the economy Integration of economic work under a major feature. Valve chairman Wang Jianye that the next 10 years, China's valve industry will usher in an unprecedented opportunity to open, thermal power, nuclear power, hydropower, large-scale petrochemical, oil and gas pipelines, coal liquefaction and metallurgy, water conservancy and other major projects to create supporting Valve new products, will become the key to development, key projects in these countries will lead all the high-speed increase in the valve mall. Petrochemical valve is a valve to open a very small sub-market, with the continuous advance of the global petrochemical industry, these years, petrochemical valves have been changing with each passing day. According to the US Department of Energy Information Agency estimates, in 2008 -2035, the global power consumption will increase by about 53%, and by 2035, oil and natural gas will account for the total power consumption of 52%, in the global context Crude oil needs and digging will adhere to the basic stability of the situation. "This will be the areas of oil and gas gathering valve needs to play a stronger role in supporting the increase." Shuangheng valve chairman Huang marked Italian. Large-scale investment in oil and gas pipeline will promote the industrial valves, especially large-diameter valves need to continue to expand. At that time, China's oil and natural gas consumption growth has exceeded output growth, supply and demand gap continues to expand, which also gave birth to the domestic oil and gas-related difficulties. In the future period, China will build a lot of domestic pipeline to end the import of oil and gas outside the pipeline connection, and in the country constitute a more systematic oil and gas pipeline network. Thus, this time oil and gas pipeline investment will remain at a high level, the petrochemical valve needs of the mall will also end the rapid increase.
In the modern economic and social conditions to start high-speed, automation will be the inevitable trend of social development. Therefore, it is necessary for the valve company to keep up with the social trend, in order to compete in the market in an invincible position. With the social industrial road, petrochemical and other industrial valves and other products also need to show a professional Chinese, standardized, large-scale, complete sets of trends, together with the need for energy-saving increasingly high. The valve will also be due to the integration of mechanical and electrical valves ushered in a new opportunity and turn for the first time, the need for mechanical and electrical valves on the mall began to increase, the mall is still a potential space for development, but together with the product quality and the higher the need . Valve work products into a different period, not only the product category needs to be replaced, and the company's internal management also need to work according to the norms of deepening reform. Although the work of the valve to start a more stable long-term, but there are still non-standard competition in the industry, such as some operators through the waste valve innovation, scratch oil sc paint after the first sale, to project quality serious security risks, Seriously disrupted the valve shopping mall order. Brand is the product of economic products, the brand is not only a title, an image, a convey the questions, but also a reflection of the company's various costs, the company's operations are all through the brand to convey the action. Brand is not only the company's product concept, but also the performance of the company as. Brand communication focused on the user's minds rather than the product itself, making the "cut-off valve election security" in the field of alternative products can not replace the establishment of the brand concept, which is Mingbao valve success of the base secret.
Market Competitiveness of Axial Flow Pumps
To seek to continue innovation, to enable axial flow pump enterprises in the increasingly fierce competition in the professional tide of survival, and development. About a number of competitive big companies, after the competition, the company has become increasingly large scale, the famous degree of change is getting higher and higher. But on some do not have the competitiveness of small and medium companies, may be faced with the risk of being annexed or closed down. In the increasingly fierce valve mall, with the center of the competitiveness of companies in the mall in the shelter, innovation into the company to win the mall's weapon. Despite the huge testing, these years, by the domestic investment environment and the excellent foundation of the deepening of the policy, the Chinese valve will usher in the career will continue to add new opportunities. Valve type to self-innovation, the results of the leading technology, numerous goods dizzying, showing a booming prospects for development. It is precisely because of how the technical achievements, which makes the valve to keep the professional career positive upward trend.
Commodity market for the valve, according to the analysis of the primary trend for some time in the future are as follows:
In recent years, China's rapid development of the valve industry, by raw materials and labor costs and other factors. Product exports and market share continues to expand, and gradually become the main production base of professional and the main product sales market. China's control valve plant a lot of small-scale, lack of central competitiveness, and the company concentration is low, it is difficult in the world market influence, to a large extent restricted the healthy development of the valve profession.
Merchandise skills to control the development of China's valve goods is an important factor
Despite the rapid development of a number of township enterprises, but because of the low starting point of township enterprises, technical strength is very thin, poorly equipped, most of the goods are modeled on production, especially for low-pressure valve with a serious question but the above does not affect the future of China valve Career broad vision. This is mainly due to the support of the national policy and the weak demand of the valve commodity market, especially the several projects of the West-East Gas Pipeline, West to East, South-to-North Water Transfer Project and many other projects. The total import value of $ 20.134 billion, an increase of 27% .With the world economy, the total import and export volume of $ 24.1 billion, an increase of 28.2% year on year total exports of $ 22.4 billion, an increase of 29.3% But also due to the high-end skills in comparison with foreign manufacturers there is still a large distance, the next period of time, the merchandise skills will become a bottleneck restricting the development of China's valve merchandise. Until recently, Chinese valve manufacturers were limited to less profitable target markets such as Ethiopia, Sudan, Iran, Iraq, and some Southeast Asian malls. These malls are small in size, the resolution process depends entirely on the price plan, profit space is limited. Industry sources, the valves in the industrial process, mostly used to control the flow of various fluids and flow, such as water, oil, chemical liquid, based on the parameters of temperature, pressure and flow. The factory control valves are commonly used pressure reducing valve, pneumatic fixed temperature valve, solenoid valve temperature system, proportional control valve temperature system, temperature control valve, and several varieties. In the selection of various types of active valve, should consider the variety of heat engine, the demand for accuracy, control valve quality, pressure drop, flow and its structure, failure rate, factory credit and after-sales service and other factors.
China's imports of valve manufacturers need to focus on such an undeniable reality: If you want to survive in the future, they need to improve the performance has been sluggish, access to large export production surplus. The current export income is not much of the main reason is that China's domestic market presents many business opportunities, and China's imports of valves produced by the quality of equipment is not enough to sell to the sea
Commodity market for the valve, according to the analysis of the primary trend for some time in the future are as follows:
In recent years, China's rapid development of the valve industry, by raw materials and labor costs and other factors. Product exports and market share continues to expand, and gradually become the main production base of professional and the main product sales market. China's control valve plant a lot of small-scale, lack of central competitiveness, and the company concentration is low, it is difficult in the world market influence, to a large extent restricted the healthy development of the valve profession.
Merchandise skills to control the development of China's valve goods is an important factor
Despite the rapid development of a number of township enterprises, but because of the low starting point of township enterprises, technical strength is very thin, poorly equipped, most of the goods are modeled on production, especially for low-pressure valve with a serious question but the above does not affect the future of China valve Career broad vision. This is mainly due to the support of the national policy and the weak demand of the valve commodity market, especially the several projects of the West-East Gas Pipeline, West to East, South-to-North Water Transfer Project and many other projects. The total import value of $ 20.134 billion, an increase of 27% .With the world economy, the total import and export volume of $ 24.1 billion, an increase of 28.2% year on year total exports of $ 22.4 billion, an increase of 29.3% But also due to the high-end skills in comparison with foreign manufacturers there is still a large distance, the next period of time, the merchandise skills will become a bottleneck restricting the development of China's valve merchandise. Until recently, Chinese valve manufacturers were limited to less profitable target markets such as Ethiopia, Sudan, Iran, Iraq, and some Southeast Asian malls. These malls are small in size, the resolution process depends entirely on the price plan, profit space is limited. Industry sources, the valves in the industrial process, mostly used to control the flow of various fluids and flow, such as water, oil, chemical liquid, based on the parameters of temperature, pressure and flow. The factory control valves are commonly used pressure reducing valve, pneumatic fixed temperature valve, solenoid valve temperature system, proportional control valve temperature system, temperature control valve, and several varieties. In the selection of various types of active valve, should consider the variety of heat engine, the demand for accuracy, control valve quality, pressure drop, flow and its structure, failure rate, factory credit and after-sales service and other factors.
China's imports of valve manufacturers need to focus on such an undeniable reality: If you want to survive in the future, they need to improve the performance has been sluggish, access to large export production surplus. The current export income is not much of the main reason is that China's domestic market presents many business opportunities, and China's imports of valves produced by the quality of equipment is not enough to sell to the sea
The working principle of mixed flow pump
Mixed flow pump is relying on the centrifugal force and axial thrust of the mixed effect to transport the liquid, so called mixed-flow pump mixed flow pump from the working principle, when the prime mover moving impeller rotation, the role of both centrifugal force and axial Thrust, centrifugal pump and axial flow pump is a general. Some people do baidu optimization too narrow, pushed to the school forum and pushed to the business forum must be different. So it is between a centrifugal pump and an axial pump between the pump. Mixed-flow pump than the speed higher than the centrifugal pump, below the axial flow pump, usually between 300-500. East China's largest hosting service providers; rich computer room capital, excellent network services, is the host of your preferred storage! Its head is higher than the axial pump, but lower than the centrifugal pump axial flow pump than small, larger than the centrifugal pump. Mixed flow pump is mainly used for agricultural irrigation and drainage, the other is also used for urban drainage, can be used as thermal power plant circulating pump.
Mixed flow pump common problems, solutions
1, drive shaft or motor bearing overheating
Occurrence factor: short of lubricant or bearing breakage.
Remedy: Fill the oil or replace the bearing
2, mixed flow pump does not water
Factors: the pump and the suction pipe is not filled with water; moving water level is lower than the pump water pipe; suction pipe rupture.
Solution: Remove the bottom valve problems, filling the water; down pump device orientation, so that the water pipe in the moving water level below, or so moving water level and then filter the water pipe and then pumping; repair or replace the suction pipe.
3, mixed-flow pump power consumption is too large
Factors: the pump speed is too high; water pump spindle or water pump spindle and motor spindle is not concentric or not parallel; selection of pump head is not appropriate; pump inhalation of sediment or obstruction; motor ball bearing damage.
Correct the pump shaft or adjust the relative position of the pump and the motor; use the appropriate lift of the pump; finishing sediment or obstruction; replace the motor ball bearings.
4, mixed-flow pump body vibration or noise
Factors: water pump device is not strong or pump device is too high; motor ball bearing damage; water pump spindle or motor spindle spindle is not concentric, not parallel and so on.
Solution: Install steady water pump or pump down the height of the device; replace the motor ball bearing; correct twists and turns pump shaft or adjust the relative position of the pump and motor.
5, mixed flow pump lack of flow
Affect the lack of pump flow is more than suction pipe leakage, bottom valve leakage; inlet obstruction; bottom valve into the water depth of the lack of; pump speed is too low; seal ring or impeller wear too large;
The bottom of the valve into the water depth is greater than 1.5 times the diameter of the inlet pipe, plus the end of the water into the water depth of the end of the valve into the water depth of the bottom of the valve into the water, ; View the power supply voltage, improve pump speed, replace the seal ring or impeller; down the pump device orientation, or replace the high-head mixed-flow pump.
Occurrence factor: short of lubricant or bearing breakage.
Remedy: Fill the oil or replace the bearing
2, mixed flow pump does not water
Factors: the pump and the suction pipe is not filled with water; moving water level is lower than the pump water pipe; suction pipe rupture.
Solution: Remove the bottom valve problems, filling the water; down pump device orientation, so that the water pipe in the moving water level below, or so moving water level and then filter the water pipe and then pumping; repair or replace the suction pipe.
3, mixed-flow pump power consumption is too large
Factors: the pump speed is too high; water pump spindle or water pump spindle and motor spindle is not concentric or not parallel; selection of pump head is not appropriate; pump inhalation of sediment or obstruction; motor ball bearing damage.
Correct the pump shaft or adjust the relative position of the pump and the motor; use the appropriate lift of the pump; finishing sediment or obstruction; replace the motor ball bearings.
4, mixed-flow pump body vibration or noise
Factors: water pump device is not strong or pump device is too high; motor ball bearing damage; water pump spindle or motor spindle spindle is not concentric, not parallel and so on.
Solution: Install steady water pump or pump down the height of the device; replace the motor ball bearing; correct twists and turns pump shaft or adjust the relative position of the pump and motor.
5, mixed flow pump lack of flow
Affect the lack of pump flow is more than suction pipe leakage, bottom valve leakage; inlet obstruction; bottom valve into the water depth of the lack of; pump speed is too low; seal ring or impeller wear too large;
The bottom of the valve into the water depth is greater than 1.5 times the diameter of the inlet pipe, plus the end of the water into the water depth of the end of the valve into the water depth of the bottom of the valve into the water, ; View the power supply voltage, improve pump speed, replace the seal ring or impeller; down the pump device orientation, or replace the high-head mixed-flow pump.
Vertical mixed flow pump advantages
Vertical mixed flow pump advantages(1) simple horizontal operation pump, the impeller is above the water, before the pump starts, use the vacuum pump to the pump irrigation, the vertical pump impeller, generally sank in the water, you can directly start.
(2) the installation area includes a small drive, including, vertical pump only half of the horizontal pump room to meet. Especially in the pump large-scale today, this advantage even more outstanding.
(3) is conducive to prevent cavitation vertical pump impeller generally submerged in water, you can use the NPSH can take a larger number. As a result, the pump does not generate cavitation at a flow rate greater than the planned point.
However, due to the vertical axis, the pump is longer vertical, demolition, assembled when the crane height is high, the pump must have to meet the space above, which is the shortcomings of vertical pumps. However, the vertical pump is simply installed outdoors, so it will not become a problem.
(2) the installation area includes a small drive, including, vertical pump only half of the horizontal pump room to meet. Especially in the pump large-scale today, this advantage even more outstanding.
(3) is conducive to prevent cavitation vertical pump impeller generally submerged in water, you can use the NPSH can take a larger number. As a result, the pump does not generate cavitation at a flow rate greater than the planned point.
However, due to the vertical axis, the pump is longer vertical, demolition, assembled when the crane height is high, the pump must have to meet the space above, which is the shortcomings of vertical pumps. However, the vertical pump is simply installed outdoors, so it will not become a problem.
New Progress of Mixed Flow Pump
Department of mixed flow pump speed is too high, making the blade line speed, causing increased pressure drop, but also the main cause of pump-type cavitation. 0, & lt; / RTI & gt; Minimize piping head loss or replace high-lift pump. Impeller Impeller of the body has been in the front of the main parts of the pump are described. The calculation of pump head, shaft power and efficiency are compared with the experimental results, which proves the feasibility of calculating the system and the origin of calculating error. Therefore, in order to prevent vaporization, generally not allowed to run in idling conditions (unless it is noted that the permit outside). The general absolute pressure of the fluid is often higher than the pressure drop through the calculation of the region a few number of levels, if maintained at the absolute value of the pressure level for long-term calculation, the pressure difference calculation will lead to greater error. Centrifugal pump impeller are used to backward leaf. Bearing noise; To appropriate over-election pump. Although the wall function method does not care about the area near the wall by the viscous force (viscous bottom layer and transition zone), but can save the cost of capital.
The prospect of hydraulic performance is also the main content of mixed-flow pump research. Semi-open impeller is located only after the disk. 5-38m3 / h; head: 30-80m; Galileo galileo pump - the European quality of power :. We can still calculate the value of seven equations, the gap before the extraction is (solitary / hoe) =. Also pointed out that the leaves can be divided into forward, radial and backward to three types. Explosion-proof fan is made of non-ferrous metal, anti-corrosion fan Zeyi plastic sheet as the material. All parts of the metal parts are made of high-quality acid-resistant stainless steel construction, liner with non-toxic and tasteless rubber, the working temperature of up to 120 ℃, can be used to transport food slurry and viscosity 10000 Pascal seconds? Containing the solid particles or gel block of the solution slurry, the suspension of aggressive media.
Durmuskaya [1] also studied the effect of guide vanes on the performance of a mixed-flow pump, which he attempted by several mixed-flow pumps with or without guide vanes, and concluded that although the addition of guide vanes would increase the axial friction torque, Leaves can change the tangential velocity kinetic energy of the twist into pressure potential energy, and the efficiency of the mixed-flow pump can be improved by 3% when the guide vanes are used.When the flow qv (qv = a) and the import condition are the same, The absolute speed than the curved curved blade, and liquid flow loss is proportional to the square of the speed.
In recent years, the method of numerical calculation directly solves the three-dimensional viscous flow in the mixed flow pump to obtain rapid growth. In the original variable method, when solving the variables based on the pressure, the solution of the unstressed flow field is mainly used, but in recent years it has been successfully extended to the compaction of the compressible flow field. If the blade mounting angle is adjustable and the shaft angle is small at the blade installation angle, the axial flow pump and fan for the adjustable blades can be started at a small installation angle. Second, the control equation and the selection of the premise of the gap.
The prospect of hydraulic performance is also the main content of mixed-flow pump research. Semi-open impeller is located only after the disk. 5-38m3 / h; head: 30-80m; Galileo galileo pump - the European quality of power :. We can still calculate the value of seven equations, the gap before the extraction is (solitary / hoe) =. Also pointed out that the leaves can be divided into forward, radial and backward to three types. Explosion-proof fan is made of non-ferrous metal, anti-corrosion fan Zeyi plastic sheet as the material. All parts of the metal parts are made of high-quality acid-resistant stainless steel construction, liner with non-toxic and tasteless rubber, the working temperature of up to 120 ℃, can be used to transport food slurry and viscosity 10000 Pascal seconds? Containing the solid particles or gel block of the solution slurry, the suspension of aggressive media.
Durmuskaya [1] also studied the effect of guide vanes on the performance of a mixed-flow pump, which he attempted by several mixed-flow pumps with or without guide vanes, and concluded that although the addition of guide vanes would increase the axial friction torque, Leaves can change the tangential velocity kinetic energy of the twist into pressure potential energy, and the efficiency of the mixed-flow pump can be improved by 3% when the guide vanes are used.When the flow qv (qv = a) and the import condition are the same, The absolute speed than the curved curved blade, and liquid flow loss is proportional to the square of the speed.
In recent years, the method of numerical calculation directly solves the three-dimensional viscous flow in the mixed flow pump to obtain rapid growth. In the original variable method, when solving the variables based on the pressure, the solution of the unstressed flow field is mainly used, but in recent years it has been successfully extended to the compaction of the compressible flow field. If the blade mounting angle is adjustable and the shaft angle is small at the blade installation angle, the axial flow pump and fan for the adjustable blades can be started at a small installation angle. Second, the control equation and the selection of the premise of the gap.
2016年12月20日星期二
Product Features of Axial Flow Pump
There are two kinds of axial flow pump blades, fixed and adjustable, respectively, axial flow pump in the operation requires a large change, to use large-scale axial flow pump. Small-scale axial flow pump need to start with the vacuum pump exhaust water diversion. Today we take a look at the axial flow pump product characteristics.
1, the user can be based on demand, design underground pumping station to improve the environment and style;
2, the pump station is small, civil, simple building structure, greatly reduce the investment, can reduce the cost of pumping station project 30% -40%;
3, the motor using F-class insulation, high temperature, with temperature protection, monitoring, leakage and other alarm devices;
4, to support a control of two to one control of the four control mode control cabinet, can be achieved automatically when the pump shut down, standby pump automatically start; retain fault signal (self-diagnosis) and other functions to ensure high reliability of the operation;
5, machine pump integration, installation and maintenance time-saving, save costs;
6, the product into a series, efficient pump wide area, in line with user conditions, energy efficient, low operating costs;
7, easy management, management, operation costs small;
8, easy to implement remote control and unattended.
9, can transport water, mild sewage, medium temperature up to 40 ℃, pH 4-10;
10, excellent water conservancy model, well - produced, to ensure that the user 's performance requirements;
11, double mechanical seal, reliable to prevent leakage, large pumps due to axial force, the use of special thrust bearings, reasonable structure design, lubrication, heat well, bearing long life;
12, pump into the water, good cooling conditions, pump running balance is good, stable, small vibration, low noise;
1, the user can be based on demand, design underground pumping station to improve the environment and style;
2, the pump station is small, civil, simple building structure, greatly reduce the investment, can reduce the cost of pumping station project 30% -40%;
3, the motor using F-class insulation, high temperature, with temperature protection, monitoring, leakage and other alarm devices;
4, to support a control of two to one control of the four control mode control cabinet, can be achieved automatically when the pump shut down, standby pump automatically start; retain fault signal (self-diagnosis) and other functions to ensure high reliability of the operation;
5, machine pump integration, installation and maintenance time-saving, save costs;
6, the product into a series, efficient pump wide area, in line with user conditions, energy efficient, low operating costs;
7, easy management, management, operation costs small;
8, easy to implement remote control and unattended.
9, can transport water, mild sewage, medium temperature up to 40 ℃, pH 4-10;
10, excellent water conservancy model, well - produced, to ensure that the user 's performance requirements;
11, double mechanical seal, reliable to prevent leakage, large pumps due to axial force, the use of special thrust bearings, reasonable structure design, lubrication, heat well, bearing long life;
12, pump into the water, good cooling conditions, pump running balance is good, stable, small vibration, low noise;
Commissioning of axial flow pump after installation
Axial flow pumps are installed and commissioned in different situations to meet job requirements.
1, variable speed axial flow pump is to work at a certain speed, and at a certain speed to obtain the appropriate flow, head, power and efficiency. When the speed changes, its performance parameters also change accordingly, so as to achieve the purpose of regulation. If the axial flow pump is powered by a diesel engine or a gasoline engine, the throttle size can be changed to change the speed. If the axial flow pump is connected to the power machine by means of a V-belt or flat belt indirect drive, the drive pulley diameter can be changed to change the speed, Wheel or driven wheel can be, the purpose of foot to change the transmission ratio. Variable speed pump performance is more economical, wider scope of application, all agricultural pumps can be used.
2, variable angle adjustment From the structure point of view, axial flow impeller has a huge wheel hub, easy to install adjustable angle of the blade. When the blade installation angle changes, the blade of the lift of the water also changed, thus changing the performance of the pump, which is the axial flow pump variable angle adjustment. As the blade installation angle increases or decreases, the flow, head and power of the axial flow pump will change with the change. However, there is no change in the maximum efficiency point, which is very beneficial to the axial pump performance.
1, variable speed axial flow pump is to work at a certain speed, and at a certain speed to obtain the appropriate flow, head, power and efficiency. When the speed changes, its performance parameters also change accordingly, so as to achieve the purpose of regulation. If the axial flow pump is powered by a diesel engine or a gasoline engine, the throttle size can be changed to change the speed. If the axial flow pump is connected to the power machine by means of a V-belt or flat belt indirect drive, the drive pulley diameter can be changed to change the speed, Wheel or driven wheel can be, the purpose of foot to change the transmission ratio. Variable speed pump performance is more economical, wider scope of application, all agricultural pumps can be used.
2, variable angle adjustment From the structure point of view, axial flow impeller has a huge wheel hub, easy to install adjustable angle of the blade. When the blade installation angle changes, the blade of the lift of the water also changed, thus changing the performance of the pump, which is the axial flow pump variable angle adjustment. As the blade installation angle increases or decreases, the flow, head and power of the axial flow pump will change with the change. However, there is no change in the maximum efficiency point, which is very beneficial to the axial pump performance.
Check the mixing flow pump before starting
Check the mixing flow pump before starting
<1> Hand drive motor shaft coupling, check whether the rotation is flexible, with or without light or small uniform or friction feeling.
<2> Inspect the bearing; check the lubricating oil (grease) for the rolling bearing and check if the upper part of the rubber bearing is ready for lubricating the upper cooling water in the indication window.
<3> Check whether all the connecting bolts are tightened and loose.
<4> Check the inlet and outlet water channel and the water tank whether the clogging, if there should be promptly ruled out.
<5> Check whether the instrument and meter parts are normal. Check whether the power supply voltage reaches the rated voltage <380v>. The minimum supply voltage shall not be less than 5% of the rated voltage, the maximum shall not exceed 10% of the rated voltage.
<6> Check the depth of the catchment basin to see if it meets the requirements. The minimum water level of the pumping station shall not be lower than the lower surface of the pump foundation beam
<1> Hand drive motor shaft coupling, check whether the rotation is flexible, with or without light or small uniform or friction feeling.
<2> Inspect the bearing; check the lubricating oil (grease) for the rolling bearing and check if the upper part of the rubber bearing is ready for lubricating the upper cooling water in the indication window.
<3> Check whether all the connecting bolts are tightened and loose.
<4> Check the inlet and outlet water channel and the water tank whether the clogging, if there should be promptly ruled out.
<5> Check whether the instrument and meter parts are normal. Check whether the power supply voltage reaches the rated voltage <380v>. The minimum supply voltage shall not be less than 5% of the rated voltage, the maximum shall not exceed 10% of the rated voltage.
<6> Check the depth of the catchment basin to see if it meets the requirements. The minimum water level of the pumping station shall not be lower than the lower surface of the pump foundation beam
Vertical mixed flow pump advantages
Vertical mixed flow pump advantages
(1) simple horizontal operation pump, the impeller is above the water, before the pump starts, use the vacuum pump to the pump irrigation, the vertical pump impeller, generally sank in the water, you can directly start.
(2) the installation area includes a small drive, including, vertical pump only half of the horizontal pump room to meet. Especially in the pump large-scale today, this advantage even more outstanding.
(3) is conducive to prevent cavitation vertical pump impeller generally submerged in water, you can use the NPSH can take a larger number. As a result, the pump does not generate cavitation at a flow rate greater than the planned point.
However, due to the vertical axis, the pump is longer vertical, demolition, assembled when the crane height is high, the pump must have to meet the space above, which is the shortcomings of vertical pumps. However, the vertical pump is simply installed outdoors, so it will not become a problem.
(1) simple horizontal operation pump, the impeller is above the water, before the pump starts, use the vacuum pump to the pump irrigation, the vertical pump impeller, generally sank in the water, you can directly start.
(2) the installation area includes a small drive, including, vertical pump only half of the horizontal pump room to meet. Especially in the pump large-scale today, this advantage even more outstanding.
(3) is conducive to prevent cavitation vertical pump impeller generally submerged in water, you can use the NPSH can take a larger number. As a result, the pump does not generate cavitation at a flow rate greater than the planned point.
However, due to the vertical axis, the pump is longer vertical, demolition, assembled when the crane height is high, the pump must have to meet the space above, which is the shortcomings of vertical pumps. However, the vertical pump is simply installed outdoors, so it will not become a problem.
Design Features of Mixed Flow Pump
A mixed flow pump is a "pull-out" type construction pump that eliminates the need to disassemble the pump tubing when inspecting and removing the impeller and shaft seal. Equipped with precision machining of the shaft and equipped with thin oil lubrication of the bearings, packing box cover with protective sleeve. The oil level of the bearing housing can be controlled by the oil cup.
Pump foot, can withstand any load from the pipeline, and directly to the foundation. In this way, the rotor will not be subjected to the load caused by the pump bending, thus ensuring the best bearing life.
Due to the larger flow area, thereby reducing congestion.
The direction of rotation of the pump, from the drive side, in a clockwise direction.
The power drive may be an electric motor or an internal combustion engine.
The pump device can be equipped with a complete deflator device, is conducive to suction pipe exhaust.
Shaft seal of mixed flow pump
Packing seal or double-ended mechanical seal.
Mixed flow pump material
Corrosion-resistant materials.
Pump foot, can withstand any load from the pipeline, and directly to the foundation. In this way, the rotor will not be subjected to the load caused by the pump bending, thus ensuring the best bearing life.
Due to the larger flow area, thereby reducing congestion.
The direction of rotation of the pump, from the drive side, in a clockwise direction.
The power drive may be an electric motor or an internal combustion engine.
The pump device can be equipped with a complete deflator device, is conducive to suction pipe exhaust.
Shaft seal of mixed flow pump
Packing seal or double-ended mechanical seal.
Mixed flow pump material
Corrosion-resistant materials.
Transmission principle of multi-stage pump
A proper amount of water is used as working fluid in the multi-stage pump body. When the impeller rotates in a clockwise direction, the water is thrown to the periphery of the impeller, because of the centrifugal force, the water forms a closed circular ring, which is determined by the shape of the pump cavity. The next part of the water ring coincided with the inner surface of the impeller hub tangent to the inner surface of the upper part of the water ring coincides with the leaves of the top contact (actually leaves into a certain depth in the water ring). At this time between the impeller wheel and the water ring to form a crescent shaped space, and this space has been divided into several small impeller blades and equal to the number of.
If the lower impeller 0 degrees as the starting point, then the volume of the impeller rotating 180 degrees in front of the cavity from small to large, and communicated with the end face of the suction port, then the gas is inhaled, when the suction end of the cavity is isolated from the suction port; when the impeller continues to rotate, the cavity from big to small, make the gas is compressed; when the cavity communicates with the exhaust port, the gas will be discharged out of the pump. In summary, multistage pump is a pump chamber volume by the change to achieve soft pump suction, compression and exhaust, so it can change the size of the centrifugal pump. Multi stage pumps can be used in petroleum, chemical, machinery, mining, light industry, medicine and food and many other industrial sectors. In many industrial production processes, such as vacuum filter, vacuum water, vacuum feed, vacuum evaporation, vacuum evaporation, vacuum degassing and vacuum resurgence, etc., widely used in multistage pump. Can be pumped in addition to flammable, explosive gas, in addition to smoke and dust, water containing gas, therefore, the application of water ring pump is increasing.
Basic mechanism and function of vertical axial flow pump
Flow over by the suction tank water, through the suction horn tube, because the impeller blades of the impeller chamber to force the water rotation, so that the water into the guide vane, the energy conversion generated through the pump head, the cylinder is discharged from a drainage pipe. The pump through the coupling (rigid) and intermediate shaft coupling. The bearing under the motor bearing bears all the downward axial force of the rotor. Coupling elastic coupling with the intermediate shaft and the motor shaft.
Axial flow pump impeller (hub body) with a blade, according to whether the performance parameters of the pump can be adjusted to change the pump, axial flow pump in the following three:
Fixed axial flow pump - impeller (wheel hub) and blade for the overall structure, the blade is not adjustable;
Semi adjustable blade axial flow pump impeller (hub body) and blade of composite structure can only be stopped, remove the blade adjusting blade mounting angle (such as 0 degrees, plus or minus 2 degrees, plus or minus 4 degrees, plus or minus 6 degrees, plus or minus 8 degrees), adjust the angle of the stairs;
Fully adjusting blade axial flow pump through a set of regulating mechanism (mechanical or hydraulic), the pump can be used in the operation of manual, electric, computer control, etc., to carry out the blade angle of the stepless regulation.
Inlet flow channel and wet pit, dry pit installation :
Axial flow pump (especially large pump) very strict requirements on the type and size of the inlet conduit, it directly affects the performance of the pump (such as pump efficiency, cavitation performance, etc.) it is necessary through formal design (Design Institute).
Wet pit installation, refers to all or part of the pump is submerged in fluid pumped, pump partially immersed in water inhalation;
Dry pit installation, the system refers to the pump all surrounded by air, the elbow shaped suction flow into the pump.
Pump mounting base and discharge outlet position:
Double deck foundation installation: the pump is installed on the base, the motor is mounted on the motor base (on the basis). Pump axial force from the motor bearing bearing, pump run time based on the load:
Under the pressure of the foundation = pump shell body weight + pump water weight - pump axial water thrust
Motor base force = motor weight + pump rotor heavy + pump axial water thrust
Single layer foundation installation: pump and motor constitute an integral direct connection structure, installed on the basis of motor, pump shaft and motor shaft using rigid coupling connection, pump run time based on the load:
Motor Foundation (single layer foundation) stress = pump shell body weight + pump rotor weight + motor + pump casing water weight.
The double base discharge pipe is arranged between the two base, and the single layer foundation can be arranged on the basis of the requirement.
Rotor can draw out type structure :
Usually the rotor and pump body as "the whole" combined structure, maintenance of the whole pump must be removed, in order to facilitate the maintenance of the rotor can be drawn out. The rotor component (including guide vane), from the pump cylinder and discharge elbow out, not only to avoid the demolition of a discharge line, and reduce the weight lifting.
Pump guide bearing lubrication and pump shaft protection :
Delivery of water at room temperature, water lubricated rubber bearings, lubrication medium available transportation, pump shaft without protection device in the transport of water containing sand (such as Yellow River) or corrosive medium (such as water), shaft and the guide bearing, the supporting tube (sets) protection, and make the dielectric isolation, external for water lubrication.
Main components of vertical axial flow pump
1. Horn tube:
For small and medium-sized vertical axial flow pump suction chamber. The effect is to lead the water to the impeller with minimal loss. The inlet part of the loudspeaker tube is in a curved shape, and the inlet diameter is about 1.5 times of the impeller diameter. In the large axial flow pump, the suction chamber is mostly made into the form of flow passage.
2. Impeller:
It is the main working parts of axial flow pump, from the wheel hub, the water guide cone, blade and so on.
Impeller is generally composed of 2~6 blade curved blade. Streamline section. The blades of the impeller are twisted and arranged on the wheel hub. According to the possibility of blade adjustment is divided into fixed, semi regulatory and fully adjustable three.
Fixed blade and hub integrally cast blade installation angle is not adjust.
The semi adjustable blade can be installed in a certain position according to the requirements of the use, the installation angle of the blade is different, the performance curve of the pump is also different. Blade adjustment, the general need to stop and remove the impeller, in order to be adjusted, suitable for small and medium axial flow pump.
The adjustable blade is to change the blade through a hydraulic adjusting mechanical installation angle, thus changing its characteristics, to meet the head and flow operation requirements, this regulation applies to large axial flow pump. It can be adjusted without stopping or removing the impeller.
3. The guide vane:
The guide vane device is in the shape of the garden or the shape of the garden. The guide vane and guide vane hub and the pump shell composed of guide vane. The guide vane is the role of the water flowing out of the impeller, the rotary motion into axial movement, and make them become the function of pressure can reach the purpose of improving the efficiency of the pump. Leaf blade generally provided with 6 to 12. The inlet side of the guide vane is generally made to be consistent with the direction of the water outlet of the impeller, so as to avoid the impact loss of the water flow. The guide vane outlet side is often used to take 90 degrees, is to make the water flow into an axial movement. The shape of a cone is to reduce the velocity of the water.
4.The pump shaft and the bearing:
Shaft adopts the high quality carbon steel, it is used for coupling with the drive shaft, and the lower end of the impeller. Medium and small axial flow pump shaft is solid. The pump shaft of the large axial flow pump is hollow, and the blade adjustment mechanism is arranged between the hollow shaft, and the operating oil pipe or the operating rod is arranged in the shaft hole.
Bearing axial flow pump because of its different functions, there are two types, one is the guide bearing, used to bear the rotating parts of the meridional stress, radial positioning function, the other is a thrust bearing, mainly used to bear water on the leaves and downward axial thrust in vertical axial pump. Pump rotating parts weight and maintain the axial position of the rotor, and these thrust to the base of the unit.
Axial flow pump bearing using and maintenance methods and centrifugal pump bearings are similar.
5.The stuffing in the pump shaft penetrates through the outlet pipe of the place, with a packing device. The construction methods and maintenance methods are similar to the packing function of centrifugal pump.
Working principle of axial flow pump
Set this wing hung in the fluid, the fluid with a certain speed when passing through the wing surface, negative pressure, positive pressure back wing, the positive and negative pressure and the size of the wing and the angle of attack (wing back angle and flow direction of the fluid velocity) and the size of the.
If the fluid does not move, and the wing is moving at the same speed as the fluid, the wing back and the wing face are subjected to the same positive pressure and negative pressure as the front wing surface (wing). Under this pressure, the wing will gain lift.
If the wing shaped blade is fixed on the rotary shaft, forming a propeller, which can not move along the axial direction, when the shaft rotates at a high speed, wing (propeller side) due to the negative pressure and suction flow, positive pressure and wing back for drainage, so a row caused by the liquid (or gas flow). This is the working principle of axial flow pump.
Axial flow pump is a single screw pump with high specific speed, the speed ratio is generally 500~1200. Features are large flow, low head, high efficiency, small size of the pump. Common axial flow of the head is generally 4~15m, there is little more than 25m. Application of a wide range of axial flow pump in plain river network area in China pumping-sta.
What are the main types of axial flow pump
Vertical axial flow pump pump body pipe system basically can be divided into two types: one is the length of the pump is fixed, the water pipe is also fixed to 60 degrees. The transmission device of the pump is separated from the chestnut body and is connected with the intermediate transmission shaft. The other is a pump body length of pipe is according to the head of the need to design, between the pump and the power machine using a direct drive. To improve the pump inlet conditions, reduce water loss, improve the anti cavitation performance, small vertical shaft tube often made of streamlined flow pump suction bell, bell is generally made of cast iron. The suction tube of the large and medium-sized chestnut and the foundation of the chestnut stand are poured into the whole by the reinforced concrete, and the elbow shaped water inlet pipe is made. Run time also need the following several points:
1.Try to run, should check the link parts, ensure that the connection parts no loosening phenomenon.
2.Electrical, instrument work is normal, oil, gas, water, the system pipeline must not leak; pressure, hydraulic normal.
3.Check whether there is floating near the water inlet, water inlet to prevent clogging.
4.Axial flow pump rolling bearing temperature should not be greater than 75 degrees.
5.At any time to pay attention to the sound and vibration of the pump, found abnormal immediately stop inspection.
6.The gear box oil temperature should be normal.
Ten reasons for vibration of centrifugal pump
1. Ten causes the centrifugal pump vibration big reason - - Pump type selection and variable operating conditions:
Each pump has its own rated point, the actual operating conditions and design conditions are in line with the pump's dynamic stability has an important influence. Pump operating conditions in the design is relatively stable, but under variable conditions in operation, due to the role of radial force in the impeller, the vibration has increased; single pump selection is improper, or two models do not match the pump in parallel. These will cause the pump vibration.
2.Ten causes of centrifugal pump vibration of the major reasons - bearing and lubrication :
Bearing stiffness is too low, it will cause the first critical speed is reduced, causing vibration. In addition, the guide bearing closed due to bad performance of poor wear resistance, poor fixation, larger bearing clearance, also easy to cause vibration; and thrust bearings and other rolling bearing wear, will make the longitudinal axial dynamic vibration and bending vibration also increased. Improper selection of lubricating oil, deterioration, excessive content of impurities and lubrication pipeline caused by the lubrication failure, will cause the deterioration of the bearing conditions, causing vibration. Motor sliding bearing oil film of the self excitation will also produce vibration.
3.Ten causes the centrifugal pump vibration big reason - - pipeline and its installation fixed :
The pump outlet pipe bracket stiffness is not enough, the deformation is too large, resulting in the pipeline under pressure in the pump body, the pump body and the motor of the neutral pipeline during installation failure; the rivalry is too large, the import and export pipeline is connected with the pump when the internal stress is large; the inlet and outlet pipeline is loose, the restraint stiffness decreased even the outlet channel failure; all parts of fracture fragments card impeller; pipeline is not smooth, such as the outlet air bag; outlet valve board, or did not open the water inlet; air intake, uneven flow, pressure fluctuation. These causes can directly or indirectly lead to pump and pipeline vibration.
4.Ten caused by centrifugal pump vibration of the major reasons - the coordination between parts :
The motor shaft and the pump shaft concentricity error; at the connection of the motor and the drive shaft using the coupling, coupling concentricity error; static and dynamic components (e.g. between Ye Lunyi and ring) wear design gap becomes large; intermediate bearing bracket and the pump cylinder clearance exceed the standard ring gap is not proper; unbalanced; gap sealing ring around the uneven, such as ring grooves or not partition no slot, this occurs. These adverse factors can cause vibration.
5.Ten caused by centrifugal pump vibration of the major reasons - impeller :
Centrifugal pump impeller mass eccentricity. The quality control is not good in the process of manufacturing, for example, the casting quality and the processing precision are not qualified; or the liquid is corrosive, the impeller flow channel is corroded, resulting in the eccentric impeller. The number of blades, the outlet angle, the angle of wrap, the radial distance between the throat and the throat of the impeller and the radial distance between the impeller and the impeller are suitable for the centrifugal pump. Between the impeller and the pump body of the centrifugal pump, the stage between the sleeve and the spacer sleeve, the initial rub, gradually become mechanical friction and wear, which will increase the vibration of the centrifugal pump.
Non-clogging sewage pump use matters needing attention
1. The shorter the suction pipe, the better, the longest no more than 10M.
2. Non-clogging sewage pump if used for pumping thick sticky slurry, need to clean the pump chamber to prevent the deposit left in the pump.
3. Self priming pump for the first time, still need to fill the pump cavity filled with water.
4. Non-clogging self priming sewage pump for 3000 hours after the conventional operation, the need to check the pump maintenance, replacement should not be replaced if necessary.
5. Non-clogging self priming pump can be customized direct coupling, high degree of stability, stability, and more economical, but the maintenance is slightly more trouble.
6. Environmental temperature are less than 45, medium temperature are less than 60.
7. Medium pH value cast iron pump is 6 ~ 9, stainless steel self suction pump for 1 ~ 14.
8. Through the maximum diameter of the particle diameter of 60%, fiber length of 5 times the diameter of the.
9. The total weight of the impurities in the medium does not exceed 15% of the total weight of the medium, the medium proportion is not more than 1240 kg / m3.
2016年12月19日星期一
2016年12月18日星期日
Deep well pump use condition
QJ Deep well Submersible pumps use conditions
1.380 V bias voltage does not exceed + -5% and 50 HZ frequency, and the deviation is not more than + -1% of the three-phase power supply.
2. Electrical cavity must be filled with water.
3. The first-class pump impeller should at least go into the dynamic water level 2 m below surface. Static pump unit immersed under water shall not be greater than 70 m.
4. Electrical from the bottom of the bottom of the well shall be not less than 3 m.
5. The water temperature no higher than 20 ° C, QJR-temperature hot water pump up to 80 ° C.
6. Water and sand content (by mass) of not more than 0.01%.
7. Water PH 6.5-8.5.
8. The hydrogen sulfide in water content is not more than 1.5 mg / L.
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