How to operate submersible pumps to safe right?

Submersible pumps are we in the industry and agriculture, and even in other industries to the equipment, but also often use the equipment, and a lot of operation is carried out at the water's edge, risk is high, so we must know how to operate correctly, can not only ensure the safety of the electric pump can also ensure our safety.

1, the water pump work, to pay attention to the situation of water levels fall, the pump shall not work outside the road out of the water.

2, try to avoid boot when low pressure. Power supply voltage and rated voltage is within 10%, can cause high voltage motor overheating and burning windings, the voltage is too low the motor speed is reduced.

3, do not let water pump overload for a long time, don't smoke sediment concentration of water, submersible electric pump is dehydrated, so as not to make the motor overheating and burning.

4, shall have the personnel on duty when pump is running, found the abnormal situation should immediately stop check.

5, pump drive and park, unfavorable too often. Pump available outside the bamboo network or cover barbed wire, prevent Wells have stone or other hard objects in the damage to the pump impeller.

6, to install the electric leakage protection device, because the water pump in the process of using easy leakage, if press on protection device will not easily allow the operator to get an electric shock.

7, after use must will be removed from the water pump, because if the soaking time is too long can lead to water pump corrosion rust.

We at the time of operation submersible pumps must be operated in accordance with the above method, so as to ensure our safety, ensure the service life of pump.

The vibration of the pump reasons and results

The pump is conveying liquid or causes the liquid turbo-charged machinery. It transmits the mechanical energy or other external energy transmitted to the liquid, causes the liquid energy increase, mainly used for conveying liquid, including water, oil, the sour lye, the emulsion, hangs the emulsion and the liquid metal and so on, also may transport the liquid, the mixture of gases as well as contains the suspended solid liquid. The technical parameters of pump performance can be measured in flow, suction, head, shaft power, water power, efficiency, etc.; According to the different working principle can be divided into volume pump, vane pump type, etc. Positive displacement pump is to use the studio volume changes to deliver energy; Vane pump is the use of rotary vane interaction with water to deliver energy, such as centrifugal pump, axial flow and mixed flow pump type.

One, the water pump vibration cause analysis

1, 28 sla - 10 domestic vertical water pump is composed of horizontal pump direct transformation. Motor base and the pump base between the vertical height of 4.3 m, the shaft is weighed 3 t. relative to the horizontal pump, it increased the root length is 3752 mm diameter is 140 mm in the middle of the shaft. On the structure, in addition to adding a bearing on the shaft in the middle, without any modification. The four pumps operating pressure is 0.7 ~ 0.85 MPa for a long time. Under high head and large flow conditions, such a high center of gravity, quality system at high speed, the centrifugal force is very big, will cause the vibration of large unit. Combined with stent and the water pump in and out of the water direction connection stiffness is insufficient, lead to the pump and the fittings have larger displacement. Runtime pumps on the displacement cause of the bearing force change, vibration increase, so easy to fever. If the correct pump displacement, improve bearing force condition, can reduce the system's vibration intensity.

2, for the rigid connection between pump and the shaft. Due to manufacture, installation, operation when the pump shaft and the shaft concentric, cause water pump vibration; Motor, drive shaft and other source of vibration is passed directly to the pump, the form of vibration superposition, further strengthen the pump vibration. In addition, such a rigid connection increase water pump bearing on the external force, the bearing is easy fever, affect the pump shaft.

Second, the transformation

For these reasons, we adopted the following two steps.

1, strengthen rigidity pipeline. Considering of the pump as it is difficult to reinforce adopted in the pump export steel pipe welding "reinforcement" way. Along the direction of in and out of the water, the water pump outlet divergent tube and the water valve flange on both ends of the connection between the steel tube, with eight is 32 mm, width is 100 mm thickness steel plate welding. Increase the stiffness of the steel tube, reduce the deformation and resistance to water pump displacement. Measured, after reinforcement, the pump displacement of point A dropped to 0.35 mm.

2, to modify the transmission system. To reduce the vibration of the motor, transmission shaft to the water pump, changing the rigid connection between the pump and the shaft to elastic connection. Use GB4323-84 column elastic sleeve pin couplings, centrifugal pump maximum compensation displacement is 0.6 mm, the compensation Angle of 1 ° 30? . In this way, motor, the vibration of the shaft can be obtained by elastic coupling compensation, not directly to the pump.

Three, reconstruction results

After modification, measured, pump vibration by the vibrating velocity of 4.3 cm/s lower before modification is 1.48 cm/s. can decide according to the vibration intensity ISO2372-1974 standard, the pump running in a good area. Smooth operation, at the same time, water pump, bearing on the normal maintenance, also did not have the pump shaft is wear phenomenon, explain the transformation was a success.

Hydraulic ejector is outlined

What is the cause of the water pump mechanical seal leakage

Pump mechanical seal leakage fault is one of the most prone to failure in pump failure, so the water pump mechanical seal also belong to the water pump is one of the key parts in the component, model selection of the water pump mechanical seal material must be appropriate to the user conveying liquid medium, usually water pump factory are some manufacturer is nitrile butadiene rubber fluorine rubber mechanical seal mechanical seal, if the corrosion is serious to choose four fluorine material mechanical seal.

Steps/pump maintenance methods:

1, mechanical seal leakage of the first possibility is machine dynamic and static ring sealing surface wear. Machine caused by dynamic and static ring sealing surface wear of six aspects reasons:

2, installation is too tight. Observing the mechanical seal ring plane, such as severe burning phenomenon, flat black and deep traces, sealing rubber harden and loss of elasticity, the phenomenon is caused by installation too tight. The solution: adjust the installation height, the impeller is installed, with screwdriver out spring, spring has the strong tension, loosen after reset, 2-4 mm movement distance.

3, installation is too loose. Observe the machine moving and static ring sealing surface, the surface has a very thin layer of scale, can wipe, basic no wear surface, which is caused, poor lose elasticity and spring assembly or motor axial channeling move.

4, poor water quality containing particles. Due to poor water quality, contains small particles and hydrochloride content in medium high, in the shape of abrasive wear machine sealing plane or strain the phenomenon such as surface groove, ring groove. The solution: to improve the hydraulic or medium, more replacement closure.

5, dry grinding damage caused by the water running. This phenomenon found in the bottom valve type installation forms inlet negative pressure, there is air inlet pipe, inside the pump chamber, air pump after startup, friction generated when the high-speed operation of high temperature by the machine and to cool, check machine, spring tension is normal, the friction surface burning black, rubber harden craze. The solution: although way and the air inside the pump cavity, replacement of mechanical seal.

6, cavitation. Cavitation erosion is mainly produced in heat pumps. Since the medium is hot water, the water temperature is too high to produce steam pipe of the gas entering the pump cavity, this section of the vapour cannot be ruled out, resulting in lack of operation, machine sealing failure, dry grinding cavitation automatic exhaust valve, a replacement.

Submersible pump motor overload fever the cause and the solution

Submersible pump motor overheating burn out reason: a few customers put submersible pump to buy back from instruction is used directly lead to motor burn out. Submersible pump motor is need cold water to cool don't hot, so I have to put the submersible pump in the water, and water must top motor that got cooling, and then the motor to prolong life.

1, submersible pumping mud, medium density increases caused by overload. The measured medium density is greater than 1.3, even 1.5 ~ 1.6; Rich and motor power coefficient smaller (1.05 ~ 1.05).

2, sediment deposition in the pump body, impeller overload caused by braking, motor is nearly in the blocked state operation.

3, the clearance between the rotor shaft hole, and the clearance between the impeller mouth ring caused by sediment filling make rotor brake overload.

4, individual manufacturer to demand a win in the competition, reduce the motor power.

Submersible pump suction sand use conditions and applicable scope

Submersible pump suction sand unique sealing device can effectively balance oil inside and outside pressure, the maximum to protect the reliability of the mechanical seal, motor overheating protection, water detection protection and other protection measures, able to run safely for a long time under the bad working condition. Now he said for submersible pump suction sand use conditions and applicable scope.

A, diving pump suction sand conditions of use

1. The power is 50 hz or 60 hz / 230 v / 380 v / 415 v / 660 v / 1440 v, three-phase ac power supply, power distribution transformer capacity for 2-3 times the motor rated capacity.

2. The medium temperature shall not exceed 60 ℃, R type does not exceed 110 ℃, excluding inflammable and explosive gas.

3. The maximum weight of the solid particles in the medium concentration, ash was 45%, the slag is 60%.

Unit 4. Diving depth: no greater than 60 meters, the minimum submergence depth of the submerged motor shall prevail.

5. The unit work location in the medium to vertical, upper suspension positioning.

Second, submersible pump suction sand scope

1. Learn river, river, lake and sea bottom sand.

2. Drain jiang, river, lake, sea, reservoirs, ponds, plants and other underwater silt and sand.

3. Learn all kinds of stone processing plant powder slurry.

Backfilling materials 4. Transportation, all sorts of backfilling mining, slurry, slurry, coal slurry, slag, slag treatment, etc.

5. Drain the water slurry in all processing of all kinds of solid slurry items.

6. Drain open caisson, Wells in the mud.

7. Settling basin, hydropower station, reservoir, river, steel mills, power plants, open caisson, mine, fish pond silt cleaning.

Slurry pump bearing hot issues

Slurry pump bearing is one of the important parts of slurry pump. In the process of use, some problems in the bearing, tend to affect the slurry pump overall efficiency. So be sure to pay attention to proper use of slurry pump bearings. When using slurry pump, can appear sometimes bearing hot, so this is what reason? How to solve?

Slurry pump bearing hot possible reason has the following kinds: 1, the use of bearing precision is not enough. 2, lubricating oil is not enough. Answer to the question of the bearing using precision should be carefully record analysis of the bearing grinding, inspection shaft and bearing box of geometry size, machining accuracy is consistent with pattern. So in the choice of slurry pump, be sure to find reliable slurry pump manufacturer, so produce the product qualified, quality is assured. Insufficient lubrication, and if it will add lubricating oil regularly. In the process, must pay attention to the choice of lubricating oil. On the choice of lubricating oil, the first thing to consider is the slurry pump model, because of the different types of slurry pump need lubricating oil is also different. There are two main types of lubricating oil, lubricating oil lubrication and butter. Grease lubrication: filling # 2 or # 3 lithium base grease. Lubrication: filling 46 # 32 # or oil.

Mud pump common faults and maintenance methods

Mud pump is a single-stage single-suction centrifugal pump is used in mining, paper making, printing and dyeing, environmental protection, graphite, mica, gold, ceramic, oil refining, petroleum, chemical industry, farms, saltworks, iodine, dyeing, brewing, food, chemical fertilizer, coking mill plant, building, marble factory, mine, mud, sand, muddy ponds, sludge pond and dreggy liquid to send thick pulp thick liquid, charging and aerosols in sewage, also can make coal mine drainage and the fluid containing clods. If with high pressure water pump, water gun, hydraulic mechanized earthwork unit, it can be used in land leveling, dredging of river and pond, chiseling, excavation and transportation of small water conservancy engineering, as well as the city's air defense project, the following projects.

Mud pump common faults and pump maintenance methods:

Mud pump failure 1: don't pump suction

Reason: perfusion inadequate water diversion, air in the pump can't eduction, suction pipe leakage, liner and impeller clearance before

Solution: to continue to infusion water diversion, check whether the pipe is air, adjust the impeller and the former plate gap

Mud pump fault 2: pump water slowly

Reason: big, liner and impeller clearance before can't full sealed air, emptying water pipes

Solution: adjust the clearance, adjust the water pipe, install vacuum device

Mud pump failure 3: the water pressure and flow rate is small

Reason: pump with air, impeller and top plate gap, clutch closure is not tight, impeller or liner wear

Solution: gas inside the drain pump, adjust clearance, clearance, replacement of adjusting clutch friction impeller or lining

Mud pump fault 4: the pump vibration

Reason: the pump shaft with diesel engine (or motor) different heart, impeller imbalance, bearing damage

Solution: adjust the concentricity, impeller balance test and replace the bearing

Mud pump fault 5: quick wear of impeller shaft neck

Reason: low dislocation, packing, high pressure water pump head pump shaft and the rear cover different heart

Solution: replace the above mud pump head of the high pressure pump, change the packing, adjust the concentricity

Mud pump failure 6: quick wear of pump

Reason: poor construction environment (particles) and long conveying distance, suction culvert

Solution: replace the battlefield, add strength, shorten the length of inlet pipe to reduce cavitation

Measures of improving the efficiency of the centrifugal pump

1, the present situation

For high energy consumption enterprises how to saving energy and reducing consumption is currently enterprise development priority. Water supply plant of function is to provide water for residents living areas and in front of the factory, workshop running pump must run continuously throughout the year, the centrifugal water pump energy saving measures were in place is bound to cause high energy consumption, and ten of the centrifugal pump production s early, sh model, in today's increasingly tense energy situation, how to correctly the pump selection, timely adjust the pump point, make the pump running in high efficiency area, the water pump maintenance, earnestly improve the quality of equipment maintenance, improve the efficiency of variable frequency pump water supply, optimization of the pump for saving power consumption, reduce costs, improve enterprise economic benefit are of great economic significance. Many enterprises at present most of the adjustment way is to adjust the meet the demand of water in and out of the water valve, it is the practice of high energy consumption. Current water supply workshop has 3 sets of high voltage frequency conversion unit, unit 1 low voltage frequency conversion unit, how to improve the pump running state of greater efficiency, saving energy and reducing consumption, from the following aspects were analyzed.

2, improving the efficiency of the pump

2.1 the cause of low efficiency of centrifugal pump:

2.1.1 centrifugal pump point deviation from the design point of running, the cause of the operation of the centrifugal pump efficiency is low. And to improve the efficiency of the operation of the centrifugal pump must reduce losses in the pump. Under the same water supply, the higher the efficiency of the motor and pump, the motor input power is smaller, less power consumption.

2.1.2 pipeline efficiency is low. When the liquid to be delivered or flow changes, often see the adjustment method is through the adjustment of the valve opening, although this can guarantee the operation of the equipment, but it caused the line resistance is large, energy consumption is overmuch, caused the low efficiency of centrifugal pump. And most of the companies to adopt is adjusted by constant speed pump to adjust to control water pump outlet valve opening.

2.1.3 some choose centrifugal pump model itself efficiency is lower, there is no need to consider to be clear about itself, maximum flow and head and many cases were due to improper water pump installation maintenance, results in a loss in the centrifugal pump is too large, makes the centrifugal pump didn't play a proper role, running under low efficiency.

2.2 measures to improving the efficiency of the centrifugal pump

2.2.1 improve the mechanical efficiency of pump

2.2.1.1 lower bearing friction loss: the same kind of bearing, if the installation quality, operation maintenance, the power loss is different also, office TPM workshop in accordance with the company of "lubricating oil management norms" of centrifugal pump on time accurately in lubricating oil (grease), it can effectively guarantee lower bearing friction loss.

2.2.1.2 reduce friction loss: shaft sealing device before workshop of centrifugal pump by packing seal, now promoted to mechanical seal, friction loss is reduced, maintenance quantity is relatively reduced, by 2009 all ten of the centrifugal pump by the packing workshop replacement for mechanical seal.

2.2.2 pump hydraulic efficiency

Centrifugal pump material basic it is cast iron, without mechanical processing, thus increasing the flow of the fluid loss. Can take the following ways to reduce the flow loss commonly: (1) in the pump body than the surface besmear brushs paint or paint makes a smooth surface to reduce the loss. This method been is not high. (2) the port shoulds not be too long, otherwise the flow loss increases. Workshop 10 pump are distributed in two pump house, the old pump room 7, three new pump room, pump room are set before and after the pool, pipe length is moderate, does not increase the flow loss.

3, impeller cutting

Pump impeller cutting is a kind of simple and money saving water pump energy saving measures, along with the impeller diameter decreases, and flow, lift, also in reducing power, power can also be reduced a lot. Cut or remove the original impeller impeller with equal diameter smaller impeller is a good energy saving effect method. This is also the current workshop for centrifugal pump one of the most widely and effective energy saving measures.

4, variable speed regulation

Centrifugal pumps are generally based on maximum load selection, and when the pump head change is bigger, then adopt variable speed adjustment, also is the point of change the operation condition of the pump. Working condition of centrifugal pumps is composed of pump characteristic curve and characteristic curve to determine the pipeline system, so any change characteristic curve can reach the role of regulation, the water pump flow control mode has a regulating valve control, variable speed control and pump series parallel regulation. For current water pump flow control methods, variable speed control than adjusting valve control to save the cost of a lot, by variable speed adjustment, the original consumption in the power of the valve can be completely avoided, achieve good energy saving effect. And control flow and pump speed to reduce the possibility of water pump cavitation occurred. Currently enterprises of production consumption demand is higher and higher, the workshop production widely used frequency conversion technology for saving energy and reducing consumption.

Household pump common faults and maintenance methods

Household pump are widely used in our life, some families will install home pump due to its own demand. However, take charge of with pump failure, sometimes is helpless, don't know how to repair it. Today, small make up for the common faults and introduce the domestic pump pump maintenance method, then everyone can diy.

1, household pump after turning on the power supply.

Most of power plug, leads for power supply and motor windings caused by short circuit.

2, household pump is difficult to start or not start, and accompanied by "buzzing" sound.

Available maintenance small bamboo piece according to the direction of running fast moving blades, if the motor is running quickly, that is to start or start winding damage, should replace or repair the startup winding of the same capacity; If electric hairpin, most of them are mechanical failure of motor and pump head, such as bearing damage, such as impeller jammed.

3, the motor can run, but speed is slow, and chassis overheating and burning smell.

Most is caused by the motor winding short circuit, the motor should be apart, according to the condition of damage with welding, jumper, isolation, rewind and other measures to repair.

4, household pump noise, vibration during operation.

Most is bearing damage or bearing and chassis mismatch, need to open motor to check, and if the bearing damage should be replaced; If bearing "outside running round", is used for the mating surface of the pump housing can flower; If bearing "circle", but to the motor shaft wear and tear parts adopt flower processing, serious wear and tear, and adopt the method of surfacing welding before turning to repair.

Above is the household pump common faults and maintenance methods of the related content, you can want to remember, once encounter the above phenomenon, can be in accordance with the above method, troubleshooting, instead of waiting for the arrival of the maintainer. Of course, if I am not sure, that still have to wait for the guy's help, lest cause more damage to pump.

Seven characteristics of vertical centrifugal pump

Vertical centrifugal pump features a vertical centrifugal pump for vertical structure, the same caliber of imports and exports, and in the same center line, like valve installed on the line, compact appearance beautiful, cover an area of an area small, low construction investment. Vertical centrifugal pump features two pump impeller installed directly on the extension of the motor shaft, short axial dimensions, compact structure, the pump and motor bearing reasonable configuration, can effectively smooth pump operation of radial and axial load, so as to ensure the smooth operation of the pump, no vibration, low noise.

Vertical centrifugal pump features three shaft seal adopts mechanical seal or mechanical seal combination, adopt imported sealing ring, medium, high temperature resistant titanium alloy mechanical seal and using hard alloy material, wear-resistant sealing, can effectively extend the service life of mechanical seal.

Vertical centrifugal pump features four convenient installation and maintenance, do not need to open pipeline system. Hydraulic model of advanced design, high efficiency, high energy saving.

Vertical centrifugal pump features five inside the pump impeller, pump shell and its main parts adopt stainless steel stamping, special smooth flow channel, bearings, bushings with hard alloy, with super service life and prevent secondary pollution.

Vertical centrifugal pump features six vertical centrifugal pump for conveying water or other liquid of physical and chemical properties similar to Yu Qingshui, applicable to industrial and urban water supply and drainage, pressurized water supply in high-rise building, garden sprinkler irrigation, fire pressurization, long-distance transmission, hvac refrigeration cycle. Cold and hot water circulation pressurization in the bathroom, etc, and form a complete set of equipment, the use of temperature T is less than 80 degrees Celsius.

Vertical centrifugal pump features seven vertical centrifugal pump the main control parameters of the pump, pump head, flow rate Q H, eta efficiency, power, rotational speed n, working pressure, necessary cavitation allowance (NPSH), etc. The scope of the vertical centrifugal pump flow and head is very big. It can be installed in a dry place, can also be submerged.

Large sprinkler - what are the structural component

Large sprinkler, sprinkler irrigation system and its control methods, the sprinkler irrigation system including sprayer, wheel, multiple cross, airborne computer, control interface, frequency conversion speed regulating device, Angle sensor device, GPS positioning device; Onboard computer through the control interface to connect the GPS positioning device, used to receive GPS signals and the differential signal is calculated to locate sprinkler, determine the walking pace of sprinkler and sprinkler drift distance, compared to a given line with the actual route and actual given walking speed and walking speed, and adjust frequency control of motor speed control instruction through the control interface device to make the machine according to the given routes and walking speed; Angle sensing device used for measuring the cross synchronous angular; Airborne computer used to detect the synchronous angular, and through the control variable frequency speed regulating device adjust the synchronization Angle to converge to zero. The operating system and its control method can realize uniform variable of sprinkler spray.

Large sprinkler irrigation operation system, including the shower nozzle, wheel, multiple cross, its characteristics is also include the airborne computer, control interface, frequency conversion speed regulating device, Angle sensor and GPS positioning device; Described above mentioned in airborne computer, through the control interface connection to GPS positioning device, used to receive GPS signals and the differential signal is calculated to locate large sprinkler, determine the major walking speed of sprinkler and sprinkler drift distance, compared to a given line with the actual route and actual given walking speed and walking speed, and through the control interface sends control variable frequency speed regulating device in order to make sprinkler described instruction to adjust according to the given route and walking speed; Stated Angle sensor for measuring the described in the synchronous across the pendulum Angle and described will output the measurement result to the onboard computer; Described in airborne computer used to detect and described each cross the synchronous angular, and described by controlling the variable frequency speed regulating device adjustment described in the synchronous angular converge to zero

The characteristics of the stainless steel submersible pump

Stainless steel submersible pump is beautiful generous, bright as a mirror surface, tactility hale and cold, is the avant-garde submersible pump type. 316 and 317 stainless steel two main types of stainless steel submersible pump, these two kinds of stainless steel pump each have each advantage, the concrete analysis about the difference.

The performance of the 316 and 317 stainless steel is better than 310 and 304 stainless steel, 316 stainless steel application more widely, it has good corrosion resistant ability, often used in the Marine environment. This is because the 316 stainless steel can not only Marine erosion resistance, but also can avoid the industrial atmospheric corrosion. On welding, the welding performance of 316 stainless steel is more good, can use standard welding method for welding, welding should pay attention to when considering the application and select different welding materials for welding. Using 316 l stainless steel annealing treatment after welding is required. Heat resistance, 316 stainless steel has strong resistance to oxidation ability. Because there are more than 316 stainless steel said to these advantages and widely used in heavy industry, light industry, household items, and in the construction industry, if want to buy stainless steel submersible pump, submersible pump that can consider to buy 316 stainless steel. Don't be keen on gaining petty advantages and buy not suitable products, otherwise will affect the use of submersible pump, and also to repair and replacement equipment in the future to great trouble and unnecessary costs.

Submersible pump impeller design characteristics

In order to guarantee the smooth of the sewage through, must strengthen the impeller flow surface width, for large pump, can use double blade, three-blade; For a small pump, in the form of single (double) port, it is similar to a cross section bend with the same size, and very good flow characteristics. To avoid the water flow under the condition of low speed may cause jams, coil. This unique design of impeller passage with reasonable volute chamber, make wastewater in paper, textiles, bags and other materials can free pass. Impeller after dynamic and static balance, make the pump in the no-load test run and vibration are not produced in the process of loading.

The reasons of the submersible pump run time flow deviation

Submersible pump running current is large and the adjustment of the pump valve and the mechanical failure of the motor have a certain relationship. The main reasons are as follows:

1, guide bearing motor wear, pump rubber bearing wear, sealing ring wear motor or pump bearing wear, can make the submersible pump in abnormal working state on mechanical, serious damage submersible pumps, the stator winding burn. Processing method is to repair or replace the damaged bearing and shaft sleeve.

2, submersible pump, the flow of small or large use traffic is beyond the scope to use can make the motor overload: for the centrifugal water pump or mixed flow pump, too much traffic, increase of pump shaft power, can make the motor overload; Of axial flow pump, the flow is too small, the pump shaft power increases, can make the motor overload. Processing method is to adjust the valve to the centrifugal water pump or mixed flow pump decrease to increase the axial flow pump flow, make the use of the flow of water pump in the normal range.

3, submersible pump shaft bending, bearing different heart This kind of a serious condition, should immediately for maintenance, bending straightening shaft, replace the unqualified bearing, reassemble submersible pumps.

4, thrust bearing wear, submersible pump impeller and the lower cover plate wear This kind of circumstance also can make the submersible pump in abnormal working state on mechanical, serious will also damage the submersible electric pump. Processing method is to check the cause of the thrust bearing wear, whether due to the damage of mechanical seal, shaft extension end caused by sand and impurities into the motor chamber of thrust bearing caused by excessive wear. If it is the cause of mechanical seal, the repair or replacement of wear under the thrust bearing, thrust plate and impeller, cover board and other components at the same time, should replace the shaft extension end of mechanical seal.

5, submersible pump running current is big about selection, head submersible pump selection is too large, the actual use of head is small.

The four methods of control pump flow

Method one: the outlet valve opening

This method of pump and export pipeline valve series, its actual effect as adopted a new pump system, the maximum output of the pump head has not changed, but the flow curve attenuation.

Method 2: bypass valve adjustment

Valves and pumps in parallel in this approach, its practical effect as adopted a new pump system, the maximum output of the pump head change, flow curve characteristics at the same time also produces change, more close to the linear flow curve.

Method 3: adjust the impeller diameter

This method does not use any external components, flow characteristic curve changes over diameter.

Method 4: speed regulation control

Directly change the flow curve of the pump impeller rotational speed change, do not change the characteristics of the curve speed decreases, the curve flat, pressure head and maximum flow are reduced. Pump system, the overall efficiency of the outlet valve regulating and by-pass adjustment method are increased the pipeline pressure loss, pump system efficiency is greatly reduced. Impeller diameter adjustment less impact on the efficiency of pump system, speed control method for basic does not affect system efficiency, as long as the speed of less than 50% of the normal speed. Energy consumption level: assume that through the above four kind of way to pump output flow from 60 m3 / h to adjust to the 50 m3 / h, the output is 60 m3 / h when the power consumption of 100% (the pressure head is 70 m), then several kinds of method of traffic control effect on the consumption of the pump power? (1) the outlet valve opening adjustment, energy consumption was 94%, the traffic is low consumed power. (2) the by-pass adjustment, the bypass valve will reduce the head of the pump to the 55 m, this can only be achieved by increasing the flow of the pump, the energy consumption increased by 10%. (3) to adjust the impeller diameter, narrow impeller diameter of pump output flow and pressure after being reduced, energy consumption reduced by 67%. (4) speed regulation control, speed is reduced, the pump flow rate and pressure head are reduced, energy consumption reduced by 65%.

Choose agricultural submersible pump should pay attention to three aspects

Agricultural, submersible pump is a kind of rural solve peasant household production and living water main water equipment, but because many of the submersible electric pump manufacturers, technical strength gap is bigger, the product quality. So if you want to choose a reliable quality and cheaper prices of submersible pump need to pay attention to the following aspects:

First, choose

As a user, generally by the limitations of professional knowledge, can not be sure which use and an expert in the field of what brand of water pump consulting; If lack of this person, do not prevent ask old pump units, especially for users close or similar to their conditions of use. Choose the pump manufacturer, it is recommended that the priority to purchase water filling type submersible pumps, pump when first to see the brand and product certification, don't buy "3 without" product, namely no manufacturer, production date, production license. Otherwise there is a problem, the user will do. At the same time, should according to the local power supply situation to determine single-phase or three-phase pump.

Second, determine

Select the key is to determine the pump submersible pump nameplate on the head is close to, can use economic, to achieve the highest efficiency. But not require absolute equal, general deviation less than 20% can be compared under the condition of energy conservation work.

Third, check the quality

Submersible electric pump motor has a water filling type, oil filled type and block type structure, a water filling type most widely used. The two injection hole bolt all shake, a water injection (no water), another discharge air, need to wait for 15 minutes after water injection, such as motor chamber air all add water after discharge, until filled with water before the two water injection to tighten bolts. The motor in the sealing state. Motor after water filling, winding work in water, but the motor insulation measurement, measuring insulation resistance must use megohmmeter shaking table, not using the multimeter, because the multimeter range is limited, for winding and the insulation resistance test is not clear. Qualified insulation, on the bolt, the pump can be energizing test run within the pool, but not for a long time, no conditions to do idling in inoue, but not more than 2 ~ 3 seconds time.

The connection method of deep well submersible pump before delivery

Wells with submersible pump factory are generally not only lead to cable, users need to another when installation cable, so it is important to note that when I answer the cable correctly, or has a great influence on the use of submersible pump.

The connection method of deep well submersible pump

1, stripping pump cable outer sheath and the main insulation layer, with copper wire 35-40 mm, conical rubber, that are close to the core part of the line core the oxide layer on the polished clean, and use alcohol wipe wire core (had better use hydrochloric acid) and to bind up insulation, sheath layer and makes it dry naturally.

2, 1) power cable joint (2) PVC adhesive tape (3) the viscosity butyl rubber band 4) phi 1 mm wire 5) solder 6) leads to cable

3, ready to 500 w electric, rosin, solder, LMM bare copper wire and electrical tape.

4, even with bare copper wire, tighten the cable core, with electric heating, tin, requirements, infiltration. With a file repair flat welding part (there is no burr and pointed shuttle), and once again with alcohol to wipe clean to bind part, dry. 5, first half overlapping with self-adhesive butyl tape package three layers, and gradually to the external extension of wire core. Must put tape stretch 200% when bandaging, outer half a lap with PVC glue again three layers, also gradually extend outward, guarantee the bandage part not shorter than 200 mm.

6, three core cable joint three joint position should be staggered in turn a certain distance, prevent short circuit.

7, which leads to the cable for the heaving line connection method

1) cable after pick up head shake test cable and motor (no water) insulation resistance, the value of not less than 150 ohms,

Shake again after 2) motor with full water test of the motor winding insulation resistance shall be not less than 40 ohms,

3) electricity test steering (less than 2 seconds). Make sequential position tag,

4) start the well: the next well continuous wave measuring insulation resistance at the same time observation of the change in case the wall hanging broken cable insulation skin, if it is found that the insulation level fell sharply to 0.5 ohms to unit to be brought to detect when the following reasons. If no accident, the well completion can pass about the steps in front of the boot commissioning.

Induction motor inverter power supply of the energy saving control technology research

As the fan and pump load speed regulation and energy saving as well as the development of production technology, the induction motor variable frequency speed regulation also made certain progress, induction motor variable frequency control method is widely used in projects. This paper mainly on the development of induction motor energy saving control technology are analyzed, and the status quo of the application of induction motor speed controller design and energy saving operation control are discussed in this paper and the research, in order to solve the problem of induction motor light load inefficient operation.

At present, the power of reasonable utilization rate is low, especially used in motor, drive technology of poorly that electrical energy consumption is too high in our country, to relieve the tense and pollution control of our energy is very bad, this problem has caused the attention of domestic academe and engineering, the study of induction motor energy conservation has its important practical significance and application of induction motor energy-saving control technology, also has its necessity.

1 induction motor energy saving control technology development and application status of 1) the current status of application of the induction motor speed control technology.

Induction motor speed control technology is mainly divided into meet the general performance of the scalar control and meet the high dynamic performance of vector control and torque control. Scalar control, including the slip frequency control and constant voltage and frequency control two kinds of schemes, the latter is the variable frequency speed regulation technology is simple and practical, this way of scalar control don't have to rely on too much of the motor parameters, control algorithm is simpler, the controller hardware is not too high requirements, but because of the dynamic and static performance is poor, is only applicable to general performance of speed adjustment, and high dynamic performance of servo system such as nc machine tools, electric locomotive is depends on the vector control technology, the vector control technology based on direct torque control and vector transform from complex calculations, easier to realize digital. In recent years, with the continuous development of vector control technology, and has no speed sensor control, intelligent control of the motor, such as technology, application of these techniques in gradually blend together.

2) the development trend of induction motor energy saving control operation.

In the backdrop of the global energy shortage highlight, the study of induction motor energy conservation has important social and economic benefits, induction motor in the actual operation often is in light load condition, in view of the current mature control methods of focusing on dynamic method is simple and motor speed control features and ignore the energy saving problem, the running efficiency of induction motor is low. With the expanding the scope of application of variable frequency device, optimize system efficiency becomes more and more important, it also became the important subject of attention. At present, the further research of the energy saving control of induction motor running still exist many problems to be solved, such as improve the efficiency of light load frequency control of motor speed system steady, leads to a dynamic torque response; The motor load torque is hard to measure online, in most cases still need to rely on artificial to complete, and so on, can see from the existing problem, induction motor energy saving control technology in the future development will inevitably into the present three trends: search control model with the minimum loss control joint, the development of energy-saving control technology related to the engineering practice, and the comprehensive application of various kinds of efficiency optimization method.

2 speed controller design and control of induction motor energy saving operation 1) speed controller design.

Improve and optimize the speed controller, better able to solve the actual problems in the energy saving control, speed controller can be designed from the following three aspects.

One is to improve the classic speed regulator, the proportion of classic speed regulator link although has the regulating rapidity, even so, it has defects of static speed deviation, although can through effective in integrating static speed deviation will solve this problem, but the resulting control lag defects are becoming the new problems, to achieve at the same time to eliminate static speed deviation and adjust the quickness of, must be on the improvement, improvement measures are as follows: when the motor control system for a wide range of speed regulation, people can take proportion link adjust way of speed governor of transition process speeds up, and then make the speed deviation problem solved; When the motor control system for small scale speed or speed control system interference, PI adjustment, can be used to effectively solve the problem of rotation speed deviation, meanwhile, make speed control precision is higher.

Reduce the pump noise analysis method and its technological research

Water pump noise is the main gas/liquid in the process of conveying the aerodynamic noise, the structure of the vibration excitation motor noise, stand for vibration noise, and the noise of the motor. Mainly concentrated in the low frequency band, such noise level peak at about 100-450 hz range. The sound source belongs to static noise in the normal operation of pump. Noise refers to water flow in the pipe produced by the noise. In addition, the pump cavitation phenomenon and stop pump water hammer transient noise also can produce. Feed water pipe noise, affected by the velocity and pressure.

The noise of the pump house of a complete set of facilities to produce mainly for the mechanical noise, at present the management method of noise on acoustic principle is commonly used is to control noise transmission way, sound insulation, sound absorption, noise elimination, etc. Sound insulation is the use of sound insulation structure will be sound source and the sound of separated points; Absorption is the use of sound absorption structures or reduce noise sound-absorbing material; Noise elimination is using the impedance and resistance, porous diffusion principle, reduce noise.

As far as possible should be according to the principle of acoustic noise control measures, make full use of the environment and site condition. Such as:

1, according to the pump room environment, the sound source closed imprecise insulation treatment was accomplished, the pump noise room take sound absorption/sound insulation, Windows and doors also should make insulation treatment, etc.

2, the noise control equipment and equipment parts. Based weight appropriate USES new pump house water pump, to prevent the vibration noise. And should use rubber vibration isolation cushion for vibration isolation, reducing the vibration noise; Each pump set the base alone, prevent to produce resonance. On the pump suction, pressure pipe connected by "soft" as possible. Preventive maintenance, problems such as loose packing leakage, equipment parts, equipment worn parts, mechanical vibration should be timely maintenance, such as reducing the noise.

Due to different manufacturers and types of water pump, the working principle and structure will have difference, so, conduct site survey and analysis of noise of pump room sound insulation noise reduction scheme design and material selection is very important.

Quilter sound insulation noise reduction engineering technology (shenzhen) co., LTD is a professional engaged in water pump noise and pump noise damping noise reduction, set product development, design, acoustic solution and construction as one of the engineering company, specialized in water pump room and research integrated treatment of low frequency noise and vibration, solve the pump noise, according to different types of pump equipment and water pump room noise treatment, to provide users with the noise survey, analysis, provide the system of water pump room noise solutions and construction services.

Main business:

Civilian: residential area and residential sound insulation noise reduction, water pump room noise control, noise control air conditioning system, generator room noise control, distribution noise control, transformer room noise control and other machinery and equipment noise control, sound insulation noise reduction between hotels, office buildings and office area, conference center, concert halls, stadiums, theatres and other functional architectural acoustics design and construction.

Industry: mechanical equipment noise control, sound insulation, noise reduction, damping, shock absorption, noise reduction, medical equipment noise reduction, sound insulation, noise reduction, noise control, sound insulation noise reduction of workshop buildings, the wind room noise, air compressor machine room sound insulation noise reduction, equipment production line production equipment such as sound insulation noise reduction of noise and the factory environment noise control, sound insulation, shock absorption, noise reduction, etc. Comprehensive noise control engineering. All kinds of soundproof door window, sound insulation, sound insulation, sound insulation cover, such as acoustic screen between acoustic engineering.

Best ways to prolong the service life of the submersible pump

In urban construction, the excavation of foundation, auxiliary underground pipelines, bear the brunt of the underground water is the problem to be solved, and the key to solve the problem is to use the water pump can be successfully take out from underground water and sludge, the general water submersible pump will not be able to complete the project, because of the subgrade under water with a lot of sediment, it will pump impeller pump motor burn out, jam and so it must use the submersible sewage pump to complete the task of pumping.

On the popular diving sewage pump in use on the market at present is to make a lot of convenient for city building construction units, but it also has some disadvantages, which is the service life is not too long, the reason is because the sludge with different specifications of the garbage and stone, in the form of the pump body outlet blockage or entangled impeller make motor does not turn, the above situation happened pump can no longer use it soon.

To solve this problem must be water pump suction clutter and long fiber after cutting emissions, then the dirty sand and water play out, such not only prolong the service life of the pump, more create conditions to speed up the construction of municipal engineering. There is a stir type electric pump, its role and cutting is slightly different. It is equipped with all agencies attachments, when pumping water to the bottom, because of the underwater sediment or sediment reaches a certain concentration ratio and uneven, and the water drain is thick sediment not sucked into jam, it first need to put them to form a uniform thin and diluted to sediment, it is not easy to damage electric pump type. In addition to keep the main impeller shaft to the force balance, must set up a deputy impeller structure, it can reduce the pressure of the sealed cavity, make electric pump axial force and the service life of mechanical seal are greatly improved. For the heat dissipation problem of electric pump is always the key problems of the service life of the electric pump, if the cooling effect is not good, the motor temperature will rise, make the power of the motor continuously litre, easy to motor burn out, shorten the service life of the pump.

In order to solve this problem, we adopt circulating cooling system, to strengthen the function of heat dissipation, it can ensure that when the pumps above the water, also can work normally. Serious corrosion for lining liquid, can use first stainless electric pump, its resistance to corrosion, and the use of reliability will be greatly improved.

Deep well pump safety control technology procedures safety control technology procedures

1. The pump should be used in the sand content of less than 0.01% of net water, pump room with embellish tank, capacity should satisfy a start the water embellish.

2. New clothes or after overhaul of deep well, should adjust the clearance between the impeller and pump casing, impeller friction between housing and shall not be in the running.

3. Deep well before the operation should be clean water flux into the shaft and bearing shell to embellish.

4. Before starting the pump, check the project shall meet the following requirements:

1) the base foundation bolt has tightened;

2) the axial clearance requirements, insurance adjusting bolt nut has installed;

3) packing gland has tighten and after lubrication;

4) motor bearing has lubrication;

5) rotating motor rotor by hand and check out institutions are flexible and effective.

5. Deep well pump shall not be under the condition of no water idling. A water pump, secondary impeller should be dipped into the water below 1 m. In the operation often should observe the change of water level in Wells.

6. Operation, when found larger vibration based around, check the water pump bearing wear or motor packing condition; When excessive wear and leakage, should replace a new one.

7. Already contains mud pump suction and discharge, before the pump stop, clean water is rinsed clean.

8. Stop before the pump, should be closed out of the water valve and cut off the power and lock the switch box. When winter outage, should put clean water pump.

How to choose the pump lift?

Select method could satisfy the requirement of lift pump

1, the pump lift selection

Lift refers to the lift, and not carry water height, clear that to choose the pump is particularly important. Pump head is about 1.15 ~ 1.20 times the height of water. Such as a water to water the vertical height of 20 meters, the head needed for about 23 ~ 24 meters. Choosing pumps should make water pump nameplate on the head with the best head needed close to such a case, the pump efficiency is highest, use will be more economic. But not necessarily demands absolute equal, general deviation as long as no more than 20%, the water pump can be in the energy conservation work.

2, nameplate, lift much more good choice nameplate lift head needed by the far less than a water pump, often can not satisfy the user's wishes, even able to draw water, water will also tiny, even become a useless "spare pump. Whether to buy the pump head, the higher the better? It's not. High-lift pump used for low head, then there will be a heavy traffic, lead to motor overload, if the long run, the motor temperature, winding insulation will gradually aging, and even burning motor.

Three, choose appropriate flow pump pump flow, namely the water yield, generally unfavorable choose too large, otherwise, would increase the cost of buying pumps. Should be specific analysis, such as user your draft with self-priming pump, flow should try to choose smaller; Irrigation with submersible pump, such as the user can select appropriate traffic.

How to maintain the stainless steel pump?

Stainless steel pump is a kind of multi-functional product, can transport from tap water to industrial liquid of different medium, the stainless steel pump flow components is made of stainless steel plate stamping process, adapted to the different temperature, flow rate and pressure range, the stainless steel pump suitable for non-corrosive or corrosive liquid, may transport the liquid the highest temperature can reach 120 ℃. Widely used in: water supply, industry pressure, liquid transportation, water treatment, air conditioning cooling and heating circulation, irrigation and other industries.

How to maintenance and maintenance of stainless steel water pump?

(1) check whether there is any loose phenomenon on stainless steel water pump and pipeline and junction. Turn the stainless steel pump with the hand, and proved the stainless steel pump is flexible.

(2) to the bearing body join bearing lubrication oil, the center line of the pipeline pump should observe the oil level in oil mark, lubricating oil should be timely replacement or supplement.

(3) unscrewing stainless steel pump body pump water diversion plug, water perfusion (or plasma).

(4) close out of the water gate and export of pipeline pressure gauge and imported vacuum gauge.

(5) the motor running, and proved the motor steering is correct.

(6) to start the motor, after the stainless steel pump operation, open the outlet pressure gauge and imported vacuum pump, it shows that the appropriate pressure, gradually open the gate valve, check the motor load condition at the same time.

(7) to control the capacity and head of the stainless steel pump, within the scope of the specified on the sign to ensure that the stainless steel pump running at peak efficiency, to achieve maximum energy saving effect.

(8) stainless steel pump in the process of operation, bearing temperature cannot exceed environment temperature 35 c, the highest temperature should not exceed 80 c.

(9) in case of abnormal sound of a stainless steel pump should immediately stop check.

(10) stainless steel pump to stop using, first close the gate valve, pressure gauge, then stop the motor.

(11) stainless steel pump in the first months of work, the oil change 100 hours, every 500 hours after screw pump, oil change at a time.

(12) often adjust the packing gland, packing materials indoor drip situation is normal (in a drip out as appropriate).

(13) regularly check the wear condition of shaft sleeve, wear after the larger should be replaced in a timely manner.

(14) stainless steel pump when used in cold winter season, after stopping, the lower part of pump body must be drain plug unscrewed the net medium. To prevent the frost crack.

(15) stainless steel pump stopped for a long time, the pump must be opened entirely, dry moisture, rotating parts and junction are coated with grease packed, safekeeping.

What are the parameters of the impeller

Water for the compound movement in the impeller, namely on the one hand, submersible pump to work along the blade facing swimming, on the other hand also follow to adjust rotating impeller. Before a movement known as the relative motion, the velocity is called circular motion, the velocity is called peripheral speed, expressed as u. The synthesis of two kinds of sports, is the absolute motion of water inside the pump, the velocity V.

Impeller at work, it is a constant rotation of the fan, its work principle is like our home use inside the working principle of the electric fan is the same. Electric fan is a kind of perpetual motion machine, a device is to convert electrical energy into kinetic energy. Work is also converts electrical energy into kinetic energy of the impeller. Only use in the pump impeller mechanical equipment, is achieved through constantly sports a pumping function. Water pump in the life also is a very common mechanical equipment people are using the water pump is mainly the water out of the water in the river.

Its radius in office a little liquid motion state can be covered by the size of the above three speed and direction, composed of the three speed graphic called velocity triangle.

Is the main performance parameters of the pump: head, refers to the unit weight of liquid after pump, the energy gained by the head and total head, total head, or the total head, with H said that the unit is meters.

Traffic, refers to the water pump for the liquid quantity per unit time, using qq, said the unit is m 3 / or l/s.

Revolution, namely the water pump in the first minutes of revolution, with n, said unit for revolutions per minute.

Shaft power, that is, by the power of the prime mover to the water pump on the pump shaft with N, said unit for kw or horsepower.

Efficiency, the shaft power cable conveyor not all being used by the pump, which are part of the lost.

Different places fountain pump installation location

Fountain type many, generally can be divided into: common decorative fountains, combined with a sculpture fountain, sculpture, control water fountains, etc. In the general case, the location of the fountain in the axis of the building, square focus or endpoint, can also according to the environmental characteristics, do some fountain kei chan, decoration indoor and outdoor space freely. The fountain should be placed in a sheltered environment to maintain water type.

Fountain pool in the form of natural type and the whole form. Can the position of the water in the basin center, can also be a side or the freedom to decorate. Water spray form, size and the size of the fountain of proportion according to the spatial scale of fountain is located.

Open field, such as the station, park entrance before, fountain pool more choose whole form, pools, water spray, lighting not too gorgeous

Narrow space, such as street corner, fountain pool for rectangle;

In traditional gardens, water fountain pool for more natural type, but make it existes, yongquan, give priority to with natural water state performance;

Lively place, such as small local park, fountain in the form of freedom, can be combined with sculpture and other decorative, generally unfavorable and overmuch. According to the physiological features of human eye vision for fountain, sculpture, flower beds, etc, the vertical Angle of view in 30 degrees, horizontal Angle of view in the range of 45 degrees with good vision. Fountain for stadia for spraying high of 3.3 times. Of course can take advantage of the reduced visibility, cause the effect of the look up.

How to choose the fountain pump?

Fountain pump mainly used in the fountain, is the power of the fountain, is one of the important fountain equipment. Fountain pump's quality and performance of the pump has the vital role, small make up today about the sprinkler irrigation water pump how to choose for you.

Fountain pump how to choice:

One, standardization fountain pump:

1, the standardization of standardized pump water pump is the country according to the requirements of ISO, formulation, implementation of the latest model of this pump. Its main characteristic is small volume, light weight, excellent performance, easy operation, long life, low energy consumption. It represents the latest trend of current water pump industry.

2, what is a good brand water pump as a user, due to the limitations of professional knowledge, it is hard to say, the best way is to consult an expert in the field of water pump. If there is no one consulting, might as well consult some old pump users, especially those close to their conditions of use, buy these users trust, quality and reliable products and more mature, is a wise choice. At the same time, should according to the local power supply situation to determine single-phase or three-phase pump.

Second, the choice that could satisfy the requirement of lift pump, head to choose from. Head refers to the head, and not carry water height, clear that to choose the pump is particularly important. Pump head is about 1.15 ~ 1.20 times the height of water. Such as a water to water the vertical height of 20 meters, the head needed for about 23 ~ 24 meters. Choosing pumps should make water pump nameplate on the head with the best head needed close to such a case, the pump efficiency is highest, use will be more economic. But not necessarily demands absolute equal, general deviation as long as no more than 20%, the water pump can be in the energy conservation work.

Three, choose appropriate flow pump, the water yield, generally unfavorable choose too large, otherwise, would increase the cost of buying pumps. Should be specific analysis, such as user your draft with self-priming pump, flow should try to choose smaller; Irrigation with submersible pump, such as the user can select appropriate flow a few bigger.