2016年11月4日星期五
What are the characteristics of axial flow submersible pump
2016年11月3日星期四
Analysis of the main features of the fully through flow submersible electric pump
Submersible tubular pump absorption of submersible pump and the advantages of tubular pump, while also taking into account the shortcomings of other pumping stations and complexity, several new products will be the integration of a variety of mature technology integration and the formation, the principle is the pump impeller mounted on the rotor cavity of the motor rotor into the impeller of the water pump. The invalid part becomes part of the motor, when the water flow from the rotor cavity flow, hence the name. This device not only maintains the submersible pump engineering investment, has the advantages of compact structure, low noise, women's convenient, good heat dissipation, while maintaining the tubular pump hydraulic performance, smooth flow passage, the advantages of high efficiency of device.
At present, the submersible electric pump technology in our country has developed rapidly, the accumulation of experience, and the full penetration of the development and development of submersible electric pump provides the basis and conditions, the main features are as follows:
(1) the structure of submersible tubular pump is compact, axial size is shortened by more than half, light weight, metal consumption is only the traditional submersible pump 1/2, not only save metal materials, production process can greatly reduce the consumption of energy and manpower, is a resource conserving products.
(2) the assembly precision is high, the balance condition is good, the vibration isolation function of the water body, the operation is very smooth, the noise and the vibration are small, effectively reduce the noise and the heat pollution, it is the environmental protection product.
(3) and because the flow through the submersible tubular pump, reduce the bend and specific (diffusion or shrink) effect, velocity distribution, flow balance, partial loss is very small, with a very short channel, channel loss, device efficiency can be increased.
(4) the thrust force is small, the pump main shaft does not bear the torque, the shaft only need to consider the moment, can do a rough and short, high strength and stiffness, the first critical speed can reach more than 200% of the rated speed. Moment of inertia is large, so the performance of submersible tubular pump runaway especially good, suitable for all kinds of flow mode with the use of.
(5) take a wet coil of stator winding structure without sealing technology of submersible tubular pump, multilayer foundation by the establishment of the theory on the melting impurities dispersed coextrusion technology patent special winding line, water winding line is not afraid of water, there is no domestic submersible pump manufacturers most headache due to poor sealing and Water Leakage the insulation safety, reliability is much higher than that of the existing dry type submersible pump stator.
(6) due to the short axial size, light weight, small size, to achieve rapid self even installation, is expected to be installed once only 10 minutes.
To the value of the full penetration of the electric submersible pump is larger, the more obvious advantages, and therefore is particularly suitable for low head and large flow or large flow pump station installation and use.
At present, the submersible electric pump technology in our country has developed rapidly, the accumulation of experience, and the full penetration of the development and development of submersible electric pump provides the basis and conditions, the main features are as follows:
(1) the structure of submersible tubular pump is compact, axial size is shortened by more than half, light weight, metal consumption is only the traditional submersible pump 1/2, not only save metal materials, production process can greatly reduce the consumption of energy and manpower, is a resource conserving products.
(2) the assembly precision is high, the balance condition is good, the vibration isolation function of the water body, the operation is very smooth, the noise and the vibration are small, effectively reduce the noise and the heat pollution, it is the environmental protection product.
(3) and because the flow through the submersible tubular pump, reduce the bend and specific (diffusion or shrink) effect, velocity distribution, flow balance, partial loss is very small, with a very short channel, channel loss, device efficiency can be increased.
(4) the thrust force is small, the pump main shaft does not bear the torque, the shaft only need to consider the moment, can do a rough and short, high strength and stiffness, the first critical speed can reach more than 200% of the rated speed. Moment of inertia is large, so the performance of submersible tubular pump runaway especially good, suitable for all kinds of flow mode with the use of.
(5) take a wet coil of stator winding structure without sealing technology of submersible tubular pump, multilayer foundation by the establishment of the theory on the melting impurities dispersed coextrusion technology patent special winding line, water winding line is not afraid of water, there is no domestic submersible pump manufacturers most headache due to poor sealing and Water Leakage the insulation safety, reliability is much higher than that of the existing dry type submersible pump stator.
(6) due to the short axial size, light weight, small size, to achieve rapid self even installation, is expected to be installed once only 10 minutes.
To the value of the full penetration of the electric submersible pump is larger, the more obvious advantages, and therefore is particularly suitable for low head and large flow or large flow pump station installation and use.
2016年11月2日星期三
Submersible sewage pump repair and maintenance
Submersible sewage pump has a lot of advantages, so now the demand for submersible pump products also increased year by year, how to carry out the maintenance of submersible sewage pump?
1, the sewage pump should be managed and used by hand, and regularly check the insulation resistance between the electric pump winding and casing is normal.
2, each use, especially for thick sticky medium, the electric pump should be put into the water for a few minutes to prevent the pump from leaving the sediment, to ensure the clean water submersible sewage pump.
3 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), so that the mechanical seal to maintain a good state of lubrication, improve the service life of mechanical seals.
4 non clogging 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.
5 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 with sealing ring, the gap in general about 0.5mm.
6 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.
7, small sewage pump can be used to move the way, the diameter of more than 100mm submersible sewage pump is recommended to use coupling type installation, so that after the maintenance and detection.
The reason of difficulty or friction during the rotation of the water pump parts
During operation of the pump, the occasional noise pump, or a component wear is very powerful, it is possible that the components in the process of rotation and other parts of the friction, but what parts prone to friction? How to solve this problem? Below to introduce in the pump parts difficult or friction causes in the rotating process and solving methods:
First we once found in the inspection process of pipeline clearance between the self suction pump or pump shaft bending, wear ring and fixed on the pump shell does not match, the stress is too large, or wear ring ring between the shaft swing impeller is too large, the impeller and the pump shell obstacles or dirt the pump casing wear ring, affect its operations and so on fault, cause operation failure of the pumps, the impact of operational efficiency, if you like ZX or CYZ self-priming pump self-priming pump impeller and pump body produce friction, which is relatively large wear parts, so that the cost increase of pump.
The main problem is the problem of the bearing, if the bearing is not straight, the pump shaft and other parts will deviate from, therefore should carry on alignment or replacement of bearings, or check the clearance, clearance to ensure accurate, in accordance with the requirements of the replacement of the impeller or the pump shell; once the stress is too large to be eliminated, to check on the completion of this work; to check the operating conditions of rotation and bearing on various components of the damage timely replacement, keep the wear ring of the plot, in accordance with the requirements of cleaning and replacement, from pollution, to ensure the normal operation of the pump.
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First we once found in the inspection process of pipeline clearance between the self suction pump or pump shaft bending, wear ring and fixed on the pump shell does not match, the stress is too large, or wear ring ring between the shaft swing impeller is too large, the impeller and the pump shell obstacles or dirt the pump casing wear ring, affect its operations and so on fault, cause operation failure of the pumps, the impact of operational efficiency, if you like ZX or CYZ self-priming pump self-priming pump impeller and pump body produce friction, which is relatively large wear parts, so that the cost increase of pump.
The main problem is the problem of the bearing, if the bearing is not straight, the pump shaft and other parts will deviate from, therefore should carry on alignment or replacement of bearings, or check the clearance, clearance to ensure accurate, in accordance with the requirements of the replacement of the impeller or the pump shell; once the stress is too large to be eliminated, to check on the completion of this work; to check the operating conditions of rotation and bearing on various components of the damage timely replacement, keep the wear ring of the plot, in accordance with the requirements of cleaning and replacement, from pollution, to ensure the normal operation of the pump.
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The reason and solution of the sudden stop of pump
The pump suddenly stops running, this situation is more common in practice, but many people do not know the reasons for this failure, so when the first use of the pump, encounter this kind of problem, the first reaction of water quality problems, in fact, there are many reasons why this kind of problem, mostly caused by improper use or selection, how to determine the cause of the problem and the solution? Shanghai Welpump for everyone to do a small summary:
1, when in the selection of self suction pump, suction pump caused by excessive long time idling, the liquid does not suck up. So in the choice of self priming pump, be sure to determine the suction height of the pump, can meet your needs.
2, the impeller or the impeller of the centrifugal pump is a serious blockage. This situation is in use for a period of time, as a result of the liquid pumping impurities particles, leading to the impeller of the centrifugal pump has been blocked. Before the election, you must first find out whether the liquid contains particulate impurities, to facilitate customer service to you to choose the right pump.
3, the pump to produce air or at the entrance of the pipeline, there is a leak of the situation. Pump leakage will cause leakage of the pump can not be pumped out of the liquid, especially for the self suction pump, imports if the leakage of liquid certainly does not suck up, be sure to seal the pump inlet pipe.
4, packing gland or seal is not strict, there is wear and tear, lead to air leakage into the pump casing. For example, G single screw pump for a long time without a change of wearing parts, you need to check is not wearing parts, including mechanical seal or packing.
5, in the pumping heat or play in the process of liquid suction head is insufficient. Ensure adequate inlet head of the pump, the liquid is too small, the pump is easy to overload, leading to pump stop.
6, valve or entrance tube immersion depth of the problem. This situation is similar to the fifth, that is, the pump is not enough water or air pump suction does not come up, so that the motor overload resulting in parking.
The gasket 7, pump shell damage, this is more common, because a lot of pump seals are used in rubber if pumping the liquid when the temperature or corrosive, such as IHF fluorine pump, used for a long time will cause corrosion of seal or gasket aging, so that pump leakage, leakage.
All of these may cause the pump running in no reason to stop, affect the efficiency of the work. So in our daily work, mainly to check the existing static head, look at the entrance of the pipeline is reasonable, to see whether there are obstacles between devices to inspect, entrance pipeline and the existence of cavitation packing or seal timely inspection and replacement, regular lubrication, increase the suction head, timely communication with suppliers to solve the problem, the use of baffles to eliminate eddy current, in accordance with the provisions of the specification of the strict control of the depth of immersion, we cannot ignore the mat lady check the seal, in accordance with the requirements of the timely replacement.
If the above problems have been checked or can not be resolved, please call my company or online customer service consulting, we will provide you with a detailed solution!
1, when in the selection of self suction pump, suction pump caused by excessive long time idling, the liquid does not suck up. So in the choice of self priming pump, be sure to determine the suction height of the pump, can meet your needs.
2, the impeller or the impeller of the centrifugal pump is a serious blockage. This situation is in use for a period of time, as a result of the liquid pumping impurities particles, leading to the impeller of the centrifugal pump has been blocked. Before the election, you must first find out whether the liquid contains particulate impurities, to facilitate customer service to you to choose the right pump.
3, the pump to produce air or at the entrance of the pipeline, there is a leak of the situation. Pump leakage will cause leakage of the pump can not be pumped out of the liquid, especially for the self suction pump, imports if the leakage of liquid certainly does not suck up, be sure to seal the pump inlet pipe.
4, packing gland or seal is not strict, there is wear and tear, lead to air leakage into the pump casing. For example, G single screw pump for a long time without a change of wearing parts, you need to check is not wearing parts, including mechanical seal or packing.
5, in the pumping heat or play in the process of liquid suction head is insufficient. Ensure adequate inlet head of the pump, the liquid is too small, the pump is easy to overload, leading to pump stop.
6, valve or entrance tube immersion depth of the problem. This situation is similar to the fifth, that is, the pump is not enough water or air pump suction does not come up, so that the motor overload resulting in parking.
The gasket 7, pump shell damage, this is more common, because a lot of pump seals are used in rubber if pumping the liquid when the temperature or corrosive, such as IHF fluorine pump, used for a long time will cause corrosion of seal or gasket aging, so that pump leakage, leakage.
All of these may cause the pump running in no reason to stop, affect the efficiency of the work. So in our daily work, mainly to check the existing static head, look at the entrance of the pipeline is reasonable, to see whether there are obstacles between devices to inspect, entrance pipeline and the existence of cavitation packing or seal timely inspection and replacement, regular lubrication, increase the suction head, timely communication with suppliers to solve the problem, the use of baffles to eliminate eddy current, in accordance with the provisions of the specification of the strict control of the depth of immersion, we cannot ignore the mat lady check the seal, in accordance with the requirements of the timely replacement.
If the above problems have been checked or can not be resolved, please call my company or online customer service consulting, we will provide you with a detailed solution!
Installation of pipeline centrifugal pump and factors affecting the efficiency of centrifugal pump
Pipeline centrifugal pump is a very common pump, pipeline centrifugal pump installation you should check the fasteneris loose phenomenon, there is no blockage of pump flow, so as to avoid damage during the operation of water pump impeller and pump body, don't put the weight of the pipe and in the pump, the pump body is to avoid deformation. Here is a brief introduction of the installation method of pipeline centrifugal pump:
1 pipeline centrifugal pump installation technology is the key to determine the installation height of the pump.
The height is the vertical distance from the water surface to pump impeller center line, and it allowed to smoke confused on a high vacuum, high vacuum suction on the vacuum pump inlet section refers to the value of the pump product specifications or nameplate is allowed, and the water temperature at 1 standard atmospheric pressure, 20 degrees Celsius, the determination of test. It does not take into account the current situation of water after the water pipe.
The pump installation height should be allowed to suck up the vacuum after deducting the suction pipe loss head, the remaining part of the value, it is to overcome the actual height of water absorption. Pump installation height can not exceed the calculated value, otherwise, the pump will not draw water to.
2 calculated values affect the size of water pipe resistance loss of lift, therefore, should adopt the shortest piping layout, and minimize the elbow and other parts, can also be appropriately equipped with larger diameter pipe to reduce the flow tube.
3 it should be noted that the installation location of the pipeline centrifugal pump elevation and water temperature is different from the test conditions, such as local elevation more than 300 meters or more than 20 degrees Celsius water temperature, the calculated value to be modified.
Atmospheric pressure at different altitudes and the saturation vapor pressure at temperatures above 20 degrees celsius. However, when the water temperature is below 20 degrees Celsius, the saturated vapor pressure is negligible.
4 from the pipeline installation technology, suction pipes require strict sealing, no leakage, Water Leakage, otherwise it will damage the intake pump vacuum to pump out the water, even when serious pumping Sheung shui.
Therefore, to do a good job in the pipeline interface, to ensure the quality of the construction of the pipeline connection.
Several factors affecting the efficiency of pipeline centrifugal pump:
1 pipeline centrifugal pump itself efficiency is the most fundamental impact. Under the same working conditions of the pump, the efficiency may be a difference of more than 15%.
2 the operating condition of the pipeline centrifugal pump is lower than the rated condition of the pump, the pump efficiency is low and the energy consumption is high.
3 motor efficiency in the use of basic remain unchanged. Therefore, it is important to choose a high efficiency motor.
4 the influence of pipeline centrifugal pump efficiency is mainly related to the design and manufacture quality. Pump selected, the late management of small.
5 hydraulic loss, including hydraulic friction and local resistance loss. After running a certain period of centrifugal pump, the impeller and guide vane are inevitably to be worn out, the hydraulic loss is increased, and the hydraulic efficiency is reduced.
6 pipeline centrifugal pump volume loss, also known as leakage loss, including impeller seal ring, the class, the axial force balance between the three kinds of leakage loss. Volume efficiency is not only related to the design and manufacture, but also with the management of the late. After running for a certain period of time, due to the friction between the components, the gap increases, the volume efficiency decreases.
7 as the filter cylinder block, intake and other causes of pipeline centrifugal pump and idling.
8 pipeline centrifugal pump before the start, the staff do not pay attention to the centrifugal pipeline pump before the start of the preparation work, heating pump, plate pump, infusion pumps and other basic operating procedures are not complete, often caused by pump cavitation, causing the pump noise, vibration, low pump efficiency.
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1 pipeline centrifugal pump installation technology is the key to determine the installation height of the pump.
The height is the vertical distance from the water surface to pump impeller center line, and it allowed to smoke confused on a high vacuum, high vacuum suction on the vacuum pump inlet section refers to the value of the pump product specifications or nameplate is allowed, and the water temperature at 1 standard atmospheric pressure, 20 degrees Celsius, the determination of test. It does not take into account the current situation of water after the water pipe.
The pump installation height should be allowed to suck up the vacuum after deducting the suction pipe loss head, the remaining part of the value, it is to overcome the actual height of water absorption. Pump installation height can not exceed the calculated value, otherwise, the pump will not draw water to.
2 calculated values affect the size of water pipe resistance loss of lift, therefore, should adopt the shortest piping layout, and minimize the elbow and other parts, can also be appropriately equipped with larger diameter pipe to reduce the flow tube.
3 it should be noted that the installation location of the pipeline centrifugal pump elevation and water temperature is different from the test conditions, such as local elevation more than 300 meters or more than 20 degrees Celsius water temperature, the calculated value to be modified.
Atmospheric pressure at different altitudes and the saturation vapor pressure at temperatures above 20 degrees celsius. However, when the water temperature is below 20 degrees Celsius, the saturated vapor pressure is negligible.
4 from the pipeline installation technology, suction pipes require strict sealing, no leakage, Water Leakage, otherwise it will damage the intake pump vacuum to pump out the water, even when serious pumping Sheung shui.
Therefore, to do a good job in the pipeline interface, to ensure the quality of the construction of the pipeline connection.
Several factors affecting the efficiency of pipeline centrifugal pump:
1 pipeline centrifugal pump itself efficiency is the most fundamental impact. Under the same working conditions of the pump, the efficiency may be a difference of more than 15%.
2 the operating condition of the pipeline centrifugal pump is lower than the rated condition of the pump, the pump efficiency is low and the energy consumption is high.
3 motor efficiency in the use of basic remain unchanged. Therefore, it is important to choose a high efficiency motor.
4 the influence of pipeline centrifugal pump efficiency is mainly related to the design and manufacture quality. Pump selected, the late management of small.
5 hydraulic loss, including hydraulic friction and local resistance loss. After running a certain period of centrifugal pump, the impeller and guide vane are inevitably to be worn out, the hydraulic loss is increased, and the hydraulic efficiency is reduced.
6 pipeline centrifugal pump volume loss, also known as leakage loss, including impeller seal ring, the class, the axial force balance between the three kinds of leakage loss. Volume efficiency is not only related to the design and manufacture, but also with the management of the late. After running for a certain period of time, due to the friction between the components, the gap increases, the volume efficiency decreases.
7 as the filter cylinder block, intake and other causes of pipeline centrifugal pump and idling.
8 pipeline centrifugal pump before the start, the staff do not pay attention to the centrifugal pipeline pump before the start of the preparation work, heating pump, plate pump, infusion pumps and other basic operating procedures are not complete, often caused by pump cavitation, causing the pump noise, vibration, low pump efficiency.
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