How to avoid cavitation submersible pump

The corrosion phenomena exist everywhere in nature, not only in the field of biology, so it is non biological, submersible pump if not careful will appear cavitation phenomenon, which is not very good for us, it should be how to avoid?
1, can be polished, clean, improve the surface of the finish.
2, increase the diameter of the impeller inlet to achieve the purpose of reducing the flow rate at the inlet.
3, to reduce the speed of the submersible pump to reduce its inlet flow rate, you can also increase a booster pump, in order to improve the efficiency of the main pump.
4, at the entrance to increase the induction wheel, adjust the blade installation angle.
7, by reducing the pumping liquid temperature, so that the pressure of gasification decreased.
8, think of ways to reduce the resistance of the suction pipe, such as increasing the suction pipe diameter, reducing the valve in the suction pipe, elbow, etc..
9, submersible pump installed in the lower position, like the use of intrusion, but also reduce the cost.
Above several ways can avoid the problem of submersible pump from the problem of cavitation, of course, how to improve the performance of submersible pump is very important, and this is more reflected in the details of the treatment.

How to measure the insulation of submersible pump

The important factor is the electric submersible pump application, in this situation, the relevant considerations it is unavoidable, so to do insulation treatment, then how to measure the insulation of submersible pump?
The submersible pump is generally a four core cable with a multimeter to test, the multimeter to the resistance profile, because the three-phase winding is connected in star, so you can use a multimeter to measure three lines are open, the resistance value are smaller and are basically the same, Ohm resistance. This means that the three-phase winding is basically normal. The string to the rest of the same with submersible pump shell, said wire is also connected to the ground, but also in the rest of any of the three thread in a cable with in measuring the resistance, under normal circumstances, should be infinite, which is between the measuring winding insulation with wire, the more better.
In addition to explain the use of multimeter can probably check the submersible pump on insulation, because universal battery voltage meter is not high, so the submersible pump insulation with 500V insulating shake table to detect, at least to normal value greater than 0.5 to be qualified.
In order to better use the submersible pump, we need to do a good job diving pump insulation detection, so as to ensure the safety of our use, so that the work can be carried out smoothly.

Do you know the general rules of the sewage pumping station?

The sewage pumping station is an important part of the sewage system, which is characterized by continuous flow, small water flow, but the change range is big. Therefore, the design of the sump to have enough storage capacity, and should be considered in addition to the design of the standby pump to reduce the pollution of the environment, the station to provide better conditions, maintenance management. In this article, the small series will introduce the general provisions of the sewage pumping station, as follows:
Self-priming sewage pump
General provisions:
1) should be based on the amount of sewage in the near future, to determine the scale of sewage pump station. The design flow rate of the pump station should be the same as the design flow of the water inlet pipe;
2) it should be clear whether the pumping station was built, or phased, is a permanent or semi permanent, in order to determine its standards and facilities. According to the sewage pumping station rises, people water canals, or into the treatment plant to select the suitable position of pumping station;
3) in the drainage system, rainwater pumping station and sewage pumping station can be divided into different built in pumping station in the hospital, also can build structures in a seat, but water pump, tank and piping should be set as a system;
4) sump and machine between the sewage pumping station to build in the same structure, a water collecting tank and machine room should be separated by waterproof wall, leakage is not permitted, practice according to the structure design specification; sump and machine construction to maintain a certain distance from the construction, avoid the uneven settlement of the pool the circular machines use square;
5) pump station underground structures do not allow groundwater seepage, should be provided with a high water level p.5m of the waterproof measures, practices, see "water supply and drainage engineering design code} FS9 GBJ - $4};
6) pay attention to reduce the impact on the surrounding environment, combined with local conditions, the pumping station and residential houses and public buildings to maintain a certain distance, the hospital must strengthen the green, as far as possible the courtyard garden, built around the isolation zone.

What is the assembly of mine submersible pump?

Mine submersible pump assembly in the use of the product specifications are described in detail. For the first time or each time, the assembly will need to be carried out in accordance with the instructions.
(1) preparation before assembly
1) read mine pump installation instructions and installation drawings and installation procedures for mine pump clear in mind.
2) prepare lifting equipment, measuring tools and tools.
3) to do a good job of cleaning up the installation site.
4) check whether the various components of mine submersible pump is missing
(2) inspection and assembly of the rotor of the mine submersible pump
The mine submersible pump rotor is composed of a plurality of components which are assembled on the pump shaft. Then, the locking nut is fixed on the relative position of the pump shaft. If the repair of the various parts can not meet the requirements, resulting in a larger radial pulsation, mine pumps in the operation of the process is easy to produce grinding, affecting the normal operation of the pump.
In the assembly, the rotor mine pump prior to the small installation, the impeller, shaft sleeve and balance disc are mounted on the shaft, the top point and then put 2 V iron or a micrometer, check.
(1) check each sleeve, sleeve and balance disc. Each rotation of the rotor dial gauge has a maximum value and minimum value. After several tests, the two values are recorded, the difference between the two is the degree of eccentricity.
(2) the same way to check the impeller mouth ring.
(3) the assembly of multi section mine submersible pump
After assembling the pump, the end face of the balance sheet must be checked. The tolerance of the pump body parts of the various parts of the manufacturing, repair accuracy, and assembly of the tension bolt before and after the degree of uniformity.
(4) the assembly of mine pump impeller inlet and outlet of the impeller is also very critical to the neutral. If the installation is not good will affect the performance of the pump. This can be measured in the final assembly, by checking the rotor. If the axial channeling momentum is larger, the balance disc and the balance sleeve can be mounted with a smooth surface and a uniform thickness.

One up to understand how to correctly select the sewage pump control box?

In the sewage pump, to use an important device in the control box, control box is appropriate in the use of sewage pump plays a very important role, therefore, we select the control box, must be looking for the sewage pump control box to the right, the right choice of sewage pump control box, first we should know the type of control box!
The control box is also known as the control cabinet or cabinet, it can be classified according to the startup mode. The control box is the most simple direct start (motor for 0.37~22kw), the second is star delta control box (for 15~90kw), third for the self coupling blood pressure control box (for 15~160kw), fourth for the soft start control box (for 15~225kw), the fifth variable piece start control cabinet (for 0.75KW).
The above five kinds of control box and the application of motor power, according to the characteristics of these electric control box we can choose the sewage pump control box. Give a simple example, if the pump (click optional) motor power is 30KW, then we can choose the above second, third, fourth and fifth. If you want the exact choice, then we have to pay attention to some details, such as the budget cost, if the budget cost is high, then we can choose frequency conversion type, this control box can save energy and protect water pump. If the budget is not much, then we can choose the buck. It is worth noting that, no matter what form of control box also has to be determined according to the number of sewage pump and motor. For example, a control one, a control two or one with a preparation and so on.
To sum up, the choice of the control box of the sewage pump needs to be determined according to the motor power, the cost budget, the quantity of the pump and the control mode.

Submersible pump selection step

List basic data:
1, the characteristics of the media: media name, specific gravity, viscosity, corrosion, toxicity, etc.
2, the medium containing solid particles of diameter, content (mass or volume percentage)
3, medium temperature: (c)
4, the flow of the general industrial use of pumps in the process can be ignored in the pipeline system leakage, but must take into account the impact of process changes on the flow. Agricultural pumps if using the water channel must also consider leakage and evaporation.
5. Pressure: pressure drop (head loss) of suction tank pressure drainage pipe system
6, the pipeline system data (diameter, length, pipe accessories and the number of the number of suction tank to the pressure tank geometry, high)
If necessary, the device characteristic curve should be made in the design and layout of the pipeline should pay attention to the following matters:
A, a reasonable choice of pipe diameter, pipe diameter at the same flow rate, liquid flow rate loss resistance is small but the high price of small small diameter pipeline will lead to resistance loss increases rapidly so that the selected pump head increased with increasing power and operating costs have increased technology and therefore should be considered an economic perspective
B, discharge pipe and pipe fittings shall be considered to be able to withstand the maximum pressure
C, the piping layout should be arranged into a straight pipe to minimize attachment and reduce the discharge side bending radius when the length of the pipeline must turn the elbow should be 3 ~ 5 times the diameter of the pipe angle as far as possible higher than 90 DEG D, the pump must be installed in the valve (valve or valve etc.) and inverse check valve is used to adjust the operating point of pump check valve in the liquid pump to prevent backflow when the reverse and pumps to avoid water hammer blow (when the liquid back will have enormous negative pressure pump damage)
Two, determine the flow head to determine the flow
A, if the production process has been given the minimum, normal, maximum flow should be considered according to the maximum flow
B, if the basic data only to the weight of the flow should be converted into volume flow
C, given only if the normal production process flow should consider certain allowance for ns>100 large flow and low lift pump does not flow the margin from 5% to ns>50 of the small flow high lift pump flow margin 10%50 = ns = 100, the pump flow margin also take 5% and the poor quality of operation of a pump the bad margin should be 10%

Submersible pump current is too large to do?

Causes of excessive current of submersible pump
1, sewage submersible pump bearings or shaft wear, seal ring wear, the solution to replace the bearing and shaft.
2, submersible sewage pump use of the head too low resulting in submersible sewage pump flow is large, beyond the scope of use of the sewage pump motor overload, cause, solution is to adjust the submersible sewage pump outlet pipe valve, reduce the submersible sewage pump outlet flow control, current use of submersible pump at rated current range.
3, bearing wear, impeller and sewage submersible pump pump shell friction caused by the solution to replace the bearings, impeller and pump shell.
Level 4, submersible sewage pump pumping down to below the impeller water inlet end resulting in intermittent water pump body and the motor caused by anhydrous cooling fever, the solution can reduce the amount of sewage pump off a small valve, or installing a liquid level control system.
5, sewage submersible pump shaft bending, bearing due to the poor, the solution to the manufacturers to repair, replace the bearing.
The submersible pump is generally a four core cable (three-phase pump), use a multimeter to test, the multimeter resistance to stall, because the three-phase winding is connected in star, so you can use a multimeter to measure three lines are open, and the resistance value is very small, and consistent. Not much difference, is ohm resistance. This shows that the three-phase winding is basically normal. The rest of the line should be connected with the shell of the submersible pump, it shows that the ground is also connected to the. At this time, still need to put the root ground left any of the three lines and one cable in measuring the resistance, under normal circumstances, should be infinite, which is between the winding and the wire insulation measurement, the bigger the better. In addition to explain the use of multimeter can probably check the submersible pump on insulation, due to universal battery voltage table is not high, so the insulation of submersible pump should use 500V insulating shake table to detect, the normal value shall be at least 500 billion euro to be qualified.

Submersible pump water flow problem how to do?

Submersible pump often causes and treatment flow is insufficient or no water during operation: the pump mounting height is too high, the immersion depth of the impeller is not enough, leading to pump out the water drops; control the water pump installation elevation of allowable deviation, can not arbitrarily expand; steering pump reverse pump motor idling operation before the first test, check the steering with the water pump; use process of the power supply should check whether to change the water outlet valve can not be opened. Check valves, and often for the maintenance of the valve; water pipeline is not smooth or impeller is blocked. The blockage cleaning pipe and impeller, often salvage debris in the reservoir; water pump at the bottom wear ring is badly worn or clogged. Cleaning or replacement of the wear ring; liquid density is too large or too high viscosity. Look for the reasons for the change of water quality and manage it. Reinforcement or replacement of the impeller; more than one pump common pipeline output, no one-way valve installed or one-way valve seal. Check the reason after the installation or replacement of one-way valve.

What are the reasons for the failure of the submersible pump?

1, grounding fault power supply. There are four core cable of the submersible pump, careful not to take the wrong power line as grounding wire. .

2, submersible pump mechanical seal damage and leakage. Often used insulation resistance megohmmeter check submersible pump, reduce insulation resistance occurred timely take maintenance measures, will not happen the motor burned out. .

3, cable damaged water. Always check the insulation resistance of the submersible pump. .

4, the impeller stuck. The impeller stuck to the fixed, than the rated current value increases, for a long time, the stator winding of submersible pump will soon burn. .

5, both ends of the stator winding shell, the breakdown of the winding.

6, submersible pump "open", "stop" is too frequent. .

7, submersible pump running time is too long. Submersible pump dehydration operation time can only be about 1 minutes, a long time, the electric pump due to poor heat and temperature rise. .

8, lack of phase work. Lack of work, submersible pumps are generally in the braking state, much larger than the rated current value, the winding of submersible pump and temperature for a long time, will damage the stator winding. .

How to correctly calculate the cost of the input pump

Many people in the purchase of the pump will be more than three goods, the exact calculation of the pump price, and then choose to meet their own requirements of the lower prices of products. This approach really saves the initial procurement costs, and most of the product in the beginning phase can basically meet the needs of the use. But for users, up to pump in the process of using the effect is far higher than the original purchase and the cost of it, so we must work time will pump problems and failure and maintenance costs are also calculated to overall cost; similarly, pumps in operation will consume a large amount of electricity. A little Months and years pass by. down, the pump power consumption is so staggering.

After some foreign manufacturers of products sold pump tracking survey shows that purchasing cost pump in its life in the largest capital is not the first time, nor the maintenance cost, but the consumption of electrical energy. The following figure shows the results of the analysis of the cost of a foreign manufacturer to pump products.

From this result we were surprised to discover that the original pump power consumption value is far more than the cost of procurement of its own and maintenance costs, and considering the efficiency, noise, artificial maintenance and other reasons of its own, we have what reason to buy the second lowest quality "smuggled goods" products?

In fact, the principle of certain type of pump are the same, the structure, components inside is similar, the biggest difference in material, workmanship and quality components. And other products are not the same, the difference is very significant difference in the cost of the pump, the gap between the average person can not imagine. For example, a small seal, a few cents can buy cheap and good products, but dozens or even hundreds of yuan, as can be imagined by these two kinds of products manufactured products gap is much, but worrying is that in the early stage in the process of using them is almost no difference. Hundreds of thousands of times the price gap is reflected in the performance of the product and the use of the period. The short-lived (months), noise (one or two months), leakage (two or three months) and other phenomena occur continuously, so many users began to regret not the province of the dozens of pieces of money. And the use of the process of high noise and high heat is actually a valuable electric energy conversion in order to have no use of the kinetic energy (mechanical friction) and heat, the actual effective work (pumping) is much less.

Misunderstanding in the use of centrifugal pump

1 high lift pump for low lift pumping

A lot of machine hand think pump head is lower, the motor load is smaller. Under the misleading understanding of this error, the purchase of a pump, the pump will be a high lift pump. In fact, for the centrifugal pump, when the pump model is determined, the size of its power consumption is proportional to the actual flow of the pump. And the pump flow will increase with the increase of head and reduce, and thus the higher the head, the smaller the flow, the smaller the power consumption. Conversely, the lower the head, the greater the flow, the greater the power consumption. Therefore, in order to prevent motor overload, the general requirements of the actual pumping water pump lift shall not be less than 60% of the calibration head. Therefore, when the high head is used for pumping low head, the motor is easy to overload and heat, and the motor can be burnt out when the time is serious. If the emergency use, it must be in the outlet pipe on the one for the regulation of water gate (or wood object blocking, small water outlet) to reduce the flow, to prevent motor overload. Pay attention to the temperature rise of the motor, if the motor overheating, should be promptly closed or shut down water outlet flow. It is also easy to misunderstand, some hand that blocking the outlet, forced to reduce the flow will increase the load of the motor. In fact, on the contrary, the formal power outlet pipe centrifugal pump unit is provided with a drainage valve, in order to reduce the unit motor load at startup, first close the valve, the motor starts gradually after the valve is the truth.

2 large diameter pumps with small water pipes pumping

A lot of machine hand that can improve the actual head, in fact, the actual pump head = total head loss. When the pump type is determined, the total lift is certain; lift loss mainly comes from the pipeline resistance, smaller diameter obviously the greater the resistance, so the lift loss is bigger, so reducing the diameter of the pump, the actual head can only be increased, it will reduce, resulting in the decline in pump efficiency. In the same way, when the small tubular pump water pump with a large water pipe, it will not reduce the actual head of the pump, but will be reduced by the resistance of the pipeline to reduce the loss of head, so that the actual head has increased. Also that the small diameter pump with organic hand pumping pipe, will greatly increase the motor load, they think the diameter increases, the pressure of the water outlet pipe of the pump impeller is large, so it will greatly increase the motor load. As everyone knows, the size of the liquid pressure is only related to the height of the head, while the size of the water pipe section is not related. As long as the head, the pump impeller size constant, no matter how large the diameter, the role of pressure on the impeller is a certain. Just after the diameter increases, the flow resistance will be reduced, and the flow is increased, the power consumption is also increased. But as long as the rated head range, regardless of how the diameter of the pump can increase the normal work, and can also reduce the pipeline loss, improve the efficiency of the pump.

3 installation of water pipes, horizontal section or upward

In this way, the water can be gathered in the water pipe, and the vacuum degree of the water pipe and the water pump is reduced, the water suction head of the water pump is reduced, and the water discharge quantity is reduced. The correct approach is: the horizontal section should be slightly inclined to the direction of the water level, should not, not up.

4 the water inlet pipe is used on the elbow.

If the water pipe on the use of the elbow, will increase the local flow resistance. And the elbow should be in the vertical direction, not allowed to turn in the horizontal direction, so as not to gather the air.

5 water inlet and the elbow is directly connected

This causes the water to flow through the uneven distribution of the elbow into the impeller. When the inlet diameter is greater than the pump inlet, eccentric reducer should be installed. Eccentric adjustable tube mounted on a flat part to the above, the inclined part installed in the following. Otherwise, the air, the amount of water is reduced or no water pumping, and there is an impact sound, etc.. If the water inlet pipe and the water inlet of the water pump is equal to the diameter, between the water inlet of the water pump and the elbow with straight pipe, straight pipe length of not less than 3 times the pipe diameter of 2 ~.

6 equipped with bottom valve inlet pipe the next section is not vertical.

Such as this installation, the valve can not be closed, resulting in leakage. The correct installation method is: a water inlet pipe valve, the next best is vertical. If the topographic conditions are not limited to the vertical installation, the water pipe line and the horizontal plane angle should be more than 60 degrees.

The water inlet of the water inlet pipe 7 position is wrong

(1) the water inlet of the water inlet pipe from the bottom of the pool and the pool wall distance is less than the diameter of the inlet. If the bottom sediment and dirt, water from the bottom of the distance is less than 1.5 times the diameter of the pumping water, will cause the poor in sediment or debris, blocking the water inlet.

(2) the water inlet of the water inlet pipe into the water depth is not enough, it will cause the inlet swirl around the surface of the water, the water reducing effect, water. The correct installation method is: small and medium-sized water pump into the water depth shall not be less than 300 ~ 600mm, large pump shall not be less than 600 ~ 1000mm.

The 8 water outlet in the above normal water pool

If the outlet in the pool above the normal water level, although the increase of the pump head, but reduces the flow. As a result of terrain conditions, the water outlet must be high out of the water level of the water, should be installed in the elbow and the short pipe, the pipe become siphon, reduce the height of the outlet.

How to adjust the height of stainless steel sewage pump?

Stainless steel sewage pump is an important equipment, mainly used for irrigation, garden irrigation, fish ponds or reservoirs to water and water use. Due to the needs of each person is different, of course, the requirements of the stainless steel sewage pump is not the same. Everyone in the use of stainless steel sewage pump, must have some special requirements in some cases, such as water treatment sewage pump the height of stainless steel. So, this requirement can be achieved, it is not difficult to do? First of all, it is certain that the water absorption of stainless steel sewage pump can be improved, the process is not very difficult, but also more than one way. Below, let us answer for you:

Stainless steel sewage pump commonly used mainly by the pump shell, base, motor, impeller, suction chamber, suction pipe and outlet pipe. The upper part of the base is fixed on the bottom of the pump body shell, and the lower part of the base is fixed on the water absorption chamber. The impeller is fixed on the end part of the motor shaft and is arranged in the water absorption chamber. When in use, the suction pipe is first put into the pond, and before the pump is opened, the water suction pipe and the pump must be filled with water. Open the pump, the impeller rotates at a high speed under the drive of the motor, the water with the blade rotates under the action of centrifugal force, the left outside impeller injection, injection of the liquid in the pump shell gradually slow the spread of indoor speed, the pressure gradually increased, and then flows out from the outlet of the pump outlet pipe. At this time, in the leaves at the center of the vacuum area of low pressure liquid was thrown to the surrounding formation there is no air and no liquid water on the surface of the water in the pond, under the influence of atmospheric pressure, through the suction pipe into the pump, water is continuously being pumped up from the pool and continuously from the drainage pipe.

 

Stainless steel sewage pump

In general, by controlling the gap between the impeller and the base, so as to determine the water pump can pass the maximum particulate matter, in order to determine the pump for the water pump or sewage pump. When the gap between the impeller and the base is 1-2mm, it is the clear water pump. When the clearance between the impeller and the base is larger than 32mm, it is a sewage pump. General household water pump can not achieve clear water pump, sewage pump dual purpose pump, and therefore can not adapt to changes in the environment. Commonly used submersible pump water in the reservoir when the water, because the pump and the water pipe will always have water, when the vacuum degree of water absorption can not be reached, then the water will return to the water pond. After absorbing water, the water level of the reservoir is generally retained in greater than or equal to 5mm or more, the water level is low, the sewage pump can not be pumped, and can only use the water pump. Therefore, there are many limitations to the use of the pump. Users often need to be equipped with water pump and sewage pump each one to meet the use requirements, the use of a timely manner must be replaced, not only increase the investment, but also not convenient to use.

A stainless steel sewage pump suction height adjusting mechanism, the purpose is to solve the existing technology of stainless steel pump single function, not only as a water pump as a sewage pump use, design a simple operation by adjusting mechanism can replace the stainless steel sewage pump suction height.

To achieve the above purpose, the technical scheme of the utility model is a stainless steel sewage pump suction height adjusting mechanism, the height adjusting mechanism comprises a water pump sump, adjust the base; the pump sump is cylindrical, the pump sump at the bottom of the outer peripheral surface is provided with a positioning convex rib at least three a week; the wall of the water base on the regulation corresponding to the positioning convex rib is provided with internal thread; the water regulation of the upper part of the base is provided with a positioning hole, and a positioning lock bolt through the positioning hole in the water is adjusted between the base and the pump sump via two locking.

The relevant content of the above technical scheme is explained as follows:

1, the above program, the positioning of the at least three convex ribs in the bottom of the water pump sump on the outer surface of the spiral.

2, the water absorption height adjustment base is fixed on the water pump body through bolts.

 

Working principle：

Loosen the positioning lock bolt, rotating water adjustable base, the pump sump at the bottom of the outer peripheral surface of the positioning convex rib along the water regulation of internal thread rotation on the inner peripheral wall base down to a desired height, between the bottom and the water pump sump regulation at the bottom of the base away from the Imm position, at this time, stainless steel sewage in a state of pump water pump, then tighten the positioning lock bolt, the water pump body is fixed relative to the adjustable base; or loosen the positioning lock bolt, rotating water adjustable base, the positioning convex rib to pump sump at the bottom of the outer peripheral surface of the adjustable screw up along the water wall on the base to the festival height between the bottom and the water pump sump regulation at the bottom of the base away from the 40mm position, at this time, in a state of stainless steel sewage pump sewage pump, then tighten the positioning lock bolt, the water diversion The base is fixed with the water pump body.

Compared with the prior art, the utility model has the following advantages because of the use of the technical scheme:

Because the utility model between the base and the water pump suction height adjustment positions the thread with the connection, when in use, through the screw to adjust the height difference between the two, in order to control the water level height. The stainless steel can be used for sewage pump sewage pump, and can be used as a water pump, whether water is clean water or sewage, regardless of water level is high or low, can be solved by the utility model of the single pump, to solve the user need to repeat the sewage pump is equipped with stainless steel, continuous change stainless steel sewage pump trouble, and simple structure. Convenient operation.

Mechanical seal and construction and installation of chemical centrifugal pump

1, seal form for static sealing, usually only a sealing pad and a sealing ring two forms, and the sealing ring and O ring with the most widely used; for the dynamic seal chemical pump is seldom used in packing seal, mechanical seal, mechanical seal and single face and double face, balanced and unbalanced type the seal for high pressure balance type, medium (usually more than 1.0MPA pressure), double end sealing machine is mainly used for high temperature, easy crystallization, viscosity, particle and medium containing toxic volatile, double end mechanical seal should be injected into the isolation liquid to the sealing cavity, the pressure is generally higher than the medium pressure 0.07 ~ 0.1MPA.

2, the sealing material chemical pump static sealing materials commonly used in fluorine rubber, under special circumstances the use of PTFE material; mechanical seal ring is more critical of the material configuration is not the best of carbide carbide, high prices on the one hand, the hardness difference between the two is not reasonable, so the best features of discrimination under the medium.

Key points of construction and installation of chemical centrifugal pump:

Pump installation should be in line with the national standard GB50275-1998 "compressor, fan, pump installation engineering construction and acceptance specifications".

The provisions apply to the installation of centrifugal chemical pumps, pumps, vertical axial flow pumps and guide vane mixed flow pumps, motor reciprocating pumps, steam reciprocating pumps, metering pumps, screw pumps and water ring vacuum pumps.

The size, position and elevation of the installation foundation of the pump should be checked and the design requirements of the project should be checked.

The pump inspection shall meet the following requirements: according to the provisions of equipment technical documents checking pump parts and components, and there should be no missing parts, damage and corrosion, pipe protection and cover should be intact; mounting dimension shall check the pump and should be consistent with the engineering design should be the main parts, check the delivery; special medium pump seals and gaskets of varieties and specifications.

The factory has been part of the assembly, adjustment and improvement shall be removed.

By connecting the driver with the pump, to pump axis as the reference alignment, a middle machine is connected between the engine and the pump drive, using the middle axis as the reference alignment machine.

The piping installation shall comply with the provisions in GB50235 ~ 1997 "industrial metal pipeline engineering construction and acceptance specification" outside, still should meet the following requirements: the inside of the pipe and the pipe end should be clean, remove debris, sealing surface and the thread should not damage; suction pipe and the output pipe should have their support, may not pump bear the weight of the pipe; the end surface of the flange connection should be parallel, threaded pipe joint axis response, should not use flange bolts or pipe joint force connection; pipeline and pump connection, the original alignment of pump should recheck accuracy, when the pipeline connection caused by deviation, should be adjusted by the pipeline and pump tube; after the connection, should not be used in the welding and cutting, welding and cutting when needed, should remove the pipeline or take the necessary measures, and should prevent the welding slag into the pump; pump suction and discharge piping shall be in accordance with the configuration Design requirements, when no regulations, according to. The provisions of annex two of GB50275 ~ 1998 are carried out.

The pipeline lubrication, sealing, cooling and hydraulic system should be cleaned unblocked; the compression part shall be tightness test according to the provisions of the equipment technical documents. When no regulations should be in accordance with the existing national standard "industrial metal pipeline engineering construction and acceptance norms" of the provisions of the implementation.

The pump running test shall be carried out in normal operation separately in each of its affiliated system.

We should be in a case of medium pump commissioning, commissioning of the medium or medium substitute shall comply with the design requirements.

How to choose the appropriate pipeline sewage pump cable

We have the power and the distance is too long for the sewage pump  in installation, so many times we need to pump original cable in the pipeline extension cable. So, how to determine the extension of the length of the cable?

1, the length of the cable should be determined according to the length of the cable. If the original cable cable for 3x10 square, if the cable to be equipped with 100 meters, then we should choose the wiring 3x16 square.

2, if the use of pipeline sewage pump itself where supply voltage than sewage pump required voltage is low, and the original cable length and relatively long, cable wiring pipeline sewage pump in this case should be equipped with YCW type or YC type rubber sheathed cable, cable not dive into the water suggestions for selection of YCW type.

3, if the submersible sewage pump, we need to transport according to the sewage pump liquid medium to select the wiring. For example, the transmission of liquid corrosive, then the cable outside the rubber parts have to use stainless steel submersible pumps and corrosion resistance of the submersible cable, or because the submarine cable is corroded and lead to leakage of dangerous accident.

The above content is that we need to select wiring in some of the key points, only the correct choice of wiring according to the actual needs, we can ensure the efficient and safe operation of the sewage pump.

Sewage pump maintenance knowledge

1, the sewage pump should be managed and used by hand, and periodically check the insulation resistance between the electric pump winding and the casing is normal.
2, each use, especially for thicker more viscous media, should be put into the water submersible electric pump for several minutes to prevent the pump to stay sediment, to ensure the clean water submersible sewage pump.
3, submersible sewage pump such as long time should not be removed from the water pump, not long soak in the water, in order to reduce the moisture of stator winding opportunities, increase the pump life, to paint the paint off place, to avoid corrosion.
4, in the conventional state of sewage pump every 300-500 hours after the filling or replacement of oil room in the oil (10-30 oil), the mechanical seal to maintain a good state of lubrication, improve the service life of mechanical seals.
5, submersible non clogging sewage pump disassembly, maintenance, chassis components must be approved by the 0.2MPa air tightness test inspection, to ensure that the motor reliable seal, pump test should adopt the click way to ensure that products normally and then start the motor.
6, to replace the sealing ring: long-term use in water media, the gap between the impeller and the sealing ring can be increased, resulting in decreased pump flow and efficiency, should turn off the switch, lift the pump, remove the bottom cover, remove the sealing ring, according to the actual size of the impeller mouth ring sealing ring, the gap is generally about 0.5mm.
7, small submersible sewage pump can be used to move the way, the diameter of more than 100mm submersible sewage pump is recommended to use the coupling type installation, so that after the maintenance and detection.

What water filling method about automatic mix sewage pump

What water filling method about automatic mix sewage pump

Automatic water filling method of mix sewage pump before the start of the two main ways: one is the water filling valve assembly, valve check valve, installed in the inlet pipe imports, the disadvantage of this method is that valve head loss is bigger, affect the efficiency of the pump device; the other is not the end of valve with water, the biggest advantage this method is to save energy, relative to the valve of the pumping station could be saving 10% ~ 15%. The Shanghai Welpump introduced several methods of water filling automatic mix sewage pump, for users to choose to run the pump.

Artificial filling method The water inlet pipe of small diameter less than 300mm pumping station, the water inlet pipe is usually equipped with imported valve, general artificial water filling method, namely from the special water filled exhaust hole pump shell by the upper part of the water filling funnel (or an ordinary bottle to remove the bottom of the inverted water filling). The water inlet pipe of small diameter less than 300mm pumping station, the water inlet pipe is usually equipped with imported valve, also can exit from the pump outlet pipe (water piping short pump to pump water filling). Because there is no need to buy other water filling equipment, in the current rural small pumping station, the water filling method is more common.

Not the end of the valve, check valve and a small pumping station pipeline is short, but also can be used to start, one way to pump water filled from the water outlet, the water pump and the air in the pipeline is gradually carried out, the general continuous water filled a few minutes later, the normal pumping pumps can work.

The vacuum tank filling method for small pumping station is not located at the end of the valve, the vacuum tank filling method. The vacuum water tank is a closed type water tank which is made of tin. The volume of the water tank is at least 3 times of the volume of the water inlet pipe. The position of the water tank installation should be close to the water pump, and the bottom of the water tank should be slightly lower than the pump axis. The height of the vacuum tank is generally 2 times the diameter of the water tank.

Before starting the pump, the water tank filled with water for sealing. Pump starts to pump water from the vacuum tank, the tank water level resulted in the formation of a certain degree of vacuum in the tank, into the water in the pool will be under the influence of the atmospheric pressure through the inlet into the tank, thus forming the water cycle, the pump started running. The water filling method has the following advantages: small hydraulic loss, high efficiency of pumping station, low labor intensity of technical personnel, easy to start, and is conducive to the realization of the automatic control of pump unit.

Jet pump filling method for diesel engine driven pump, can be used to exclude diesel exhaust gas into the jet pump is communicated with the top of the pumping water, thereby removing the bottom of the pump valve. When the pump starts, and the handle will be connected to the closure of the valve cover, the exhaust emitted from a jet device through the tube connected to the air suction pump. After the water is filled, the valve cover is opened and the control valve is closed. This filling method is to make full use of the benefits of a power machine, two is to improve the efficiency of the pumping station.

Teach you how to choose submersible pump?

Drainage pumps used in the building are submersible sewage pump, liquid pump, vertical sewage pump and horizontal sewage pump and so on. As the building site generally smaller, less displacement, drainage pump priority use of submersible sewage pump and liquid drainage pump, sewage pump generally used in important places in which liquid; vertical and horizontal sewage pump sewage pump set isolation based on self filling type absorbent, and occupied a certain space, it is less in construction use.

Drainage pump flow should be selected according to the design flow of life, when there is a displacement of water, can be selected according to the maximum flow of life. Fire elevator sump pump flow is not less than 10L/s.

The head of the drainage pump is determined according to the lifting height and pipeline loss calculation, and then a certain free head is added. Free head should adopt 0.02 ~ 0.03MPa. Drainage pump suction pipe and outlet pipe flow rate of not less than 0.7m/s, and should not be greater than 2.0m/s.

The public building should set up a spare pump for the unit in every living drainage pool. Underground room, equipment room, garage floor drain, if there are two or more than two sets of drainage pump can not pump. When the water collecting basin can not be provided with an accident drainage pipe, the water pump should have uninterrupted power supply; when the water inlet pipe can be closed, the uninterrupted power supply can not be provided, but the alarm device should be set up.

When upgrading the sewage and waste water with large impurities, the submersible sewage pump outlet pipe inside the collection tank should not be different from the merger; when upgrade their wastewater, according to the actual situation of different sets of diving pool pump discharge pipe combined discharge.

So the question is, where can I buy these high-quality domestic submersible pump? Shanghai Welpump!

What is wrong with the use of stainless steel pump and how to repair?

stainless steel pump

http://www.wel-water-pump.com/products

(a) the pump can not be started

  One is after closing the motor does not turn without any sound. This shows that the circuit power supply circuit then impassibility, should check whether the circuit, whether insurance fuse, without exception is likely to burn out the motor stater winding, should remove line replacement. Another is that after closing the motor does not turn and accompanied by a "buzz" sound. This case should be immediately shut down inspection. The reason is that there is a 1 power line or the stater winding is not a phase, the formation of phase. 2 voltage is too low. The reason is that the power supply voltage is low, the cable is too long and the section is too small, transformer capacity is too small, should be one by one investigation. There are 3 foreign bodies in the pump body, bearing damage death card, "package axis" and "killed" phenomenon, should the proposed clean water pump inspection.

(b) no water, little or no water after the start of the pump.

  The fault reasons are: 1 parts such as water flow, water diversion tube, shell and other components seriously blocked or water pipe rupture. At this time often appears to increase the current meter readings and pointer swing. Should be immediately shut down for inspection and cleaning up. 2 the normal operation of the motor but the amount of water is less. The reason is not reasonable pump configuration, the actual head compared with the pump rated head is too much, the need to replace a higher lift pump. Also may be a pump reversal, only the lead out of any two can be adjusted relative to. If the sealing ring or impeller excessive wear and tear, should be removed in time to replace the. 3 motor running normally but not water, the main reason is that the water level in the pumping process is too low, can be transferred to the valve of the water pipe or the water pump will be put to the following half meter.

(c) the unit turns violent vibration noise

  The reasons are: the guide bearing wear

1 pump shaft, in bearing swing, or shaft bending caused by eccentric wear, the current meter degree increases, the pointer swing violently, vibration, should immediately stop replacing the guide bearing or shaft straightening.

2 impeller fastening bolts loose, impeller and guide shell collision friction, causing the pump body vibration, should be suspended from the pump, tighten the bolt.

3 thrust bearing wear, so that the front baffle plate and the flow guide pipe friction, the current table pointer swings violently. There is a clear friction, should be replaced immediately thrust bearing, impeller wear should be replaced when the impeller.

4 the motor rotor and the pump rotating part of the balance is not qualified, the rotation of the unit vibration. Should take out the motor rotor and pump impeller into action, static balance test, so that it can reach the equilibrium state.