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Contact:Miss Ren
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The basic method of vertical centrifugal chemical pump vibration and damping modification

With the development of economy, self-priming centrifugal pumps in the project has been applied more and more widely, the following details to help you self-priming centrifugal status and its development direction.

Self-priming centrifugal pumps because of its simple installation, the advantages of small occupation area, convenient maintenance, no noise, municipal engineering, factories, commercial, hospitals, hotels, residential areas such as sewage discharge is widely used in engineering. At present, China's domestic self-priming centrifugal pump manufacturer mainly by domestic production and manufacture, small number of products imported from abroad. A very broad market prospects. But the reliability of sewage pump needs to be strengthened, therefore, improve the technological content of their products is the main direction of future development of manufacturers.

Since the development of centrifugal chemical pump

In view of the existing self-priming centrifugal pump problems, some domestic manufacturers to focus on the development of pump protection system: automatic alarm or cut off the power supply in the sewage pump under abnormal operation. While this approach can play a certain effect, but this protection is necessary, but this is not the fundamental way to solve the problem, we need to focus on improving the performance of the pump, the fundamental solution to the problem.

In addition, product development should fully take into account environmental issues, to develop products that are more energy saving, environmental protection.

In summary, the submersible sewage pump is the next problem to be solved to improve the reliability of the use, can adapt to various working environment, optimizing the structure design, to further improve the performance of self-priming centrifugal chemical pump.

The basic method of vertical centrifugal chemical pump vibration and damping modification

Large vertical centrifugal pump during operation, vibration, upper and lower bearings often fever, damaged, or even the pump shaft and bearing joints wear. Water pump instability, affecting the normal water supply, need to be damping control.

Analysis, chemical pump vibration

1, home-made vertical pump 28SLA-10 is transformed from direct horizontal pumps. Motor base and the vertical height between the pump base 4.3m, the drive shaft weighing 3T. Relative to the horizontal pump, it adds a length of 3752mm diameter and 140mm in the middle shaft. In the structure, in addition to the installation of a bearing on the intermediate shaft, without any modification. The four pumps operating pressure for a long time 0.7 ~ 0.85MPa. In the high lift, large flow conditions, such a high center of gravity, the mass of high-speed rotation system, the centrifugal force is large, will cause the vibration of a larger unit. Bracket and pump out the water direction of connection stiffness is not enough, leading to the pump and the connecting piece has a larger displacement. When the pump is running to cause the displacement change, on the bearing load conditions of vibration increase, so easy to heat. If the pump displacement correction, to improve the bearing load conditions, the system can reduce the vibration intensity.

2, chemical pump and the transmission shaft are in rigid connection. Because the manufacture, installation, operation shaft concentric with the shaft, causing the pump vibration; vibration motor, shaft and other source is passed directly to the pump, the formation of the superposition of vibration, and further increase the pump vibration. In addition, increase the pump bearings are exposed to external forces the rigid connection, resulting in fever of bearings, affect the pump shaft.

Two, pump transformation

In view of the above reason, we take the following two steps transformation.

1, strengthening the pipe stiffness. Taking into account of the pump is more difficult to weld reinforcement, " ribs" approach in the pump outlet pipe. Along the direction of the water, in the connection between the steel flanges at both ends of pump outlet diffuser and the water outlet valve, with 8 thickness of 32mm, width of 100mm steel plate welding. Increase the stiffness of steel, reduce the deformation resistance, the pump displacement. After measuring, after the reinforcement, the point of displacement pump A to 0.35mm.

2, transformation of transmission system. Vibration in order to reduce the motor, transmission shaft to pump delivery, the water pump and the transmission shaft is rigidly connected to the elastic connection. The use of GB4323-84 elastic dowel pin shaft coupling, pump the maximum compensation displacement of 0.6mm, compensation angle is 1° 30?. In this way, the vibration motor, the drive shaft can be compensated through the flexible coupling, can not be directly transmitted to the water pump.

Three, the modification results

After the transformation, the measurement, chemical pump vibration is reduced by the transformation of vibration velocity for 1.48cm/s 4.3cm/s. According to the vibration intensity standard ISO2372-1974 can determine, pump running in good area. At the same time, the pump running smoothly, just normal maintenance on the bearings, shaft is no wear and tear phenomenon, indicating a successful transformation.

Large vertical centrifugal pump during operation, vibration, upper and lower bearings often fever, damaged, or even the pump shaft and bearing joints wear. Water pump instability, affecting the normal water supply, need to be damping control.

Analysis, chemical pump vibration

1, home-made vertical pump 28SLA-10 is transformed from direct horizontal pumps. Motor base and the vertical height between the pump base 4.3m, the drive shaft weighing 3T. Relative to the horizontal pump, it adds a length of 3752mm diameter and 140mm in the middle shaft. In the structure, in addition to the installation of a bearing on the intermediate shaft, without any modification. The four pumps operating pressure for a long time 0.7 ~ 0.85MPa. In the high lift, large flow conditions, such a high center of gravity, the mass of high-speed rotation system, the centrifugal force is large, will cause the vibration of a larger unit. Bracket and pump out the water direction of connection stiffness is not enough, leading to the pump and the connecting piece has a larger displacement. When the pump is running to cause the displacement change, on the bearing load conditions of vibration increase, so easy to heat. If the pump displacement correction, to improve the bearing load conditions, the system can reduce the vibration intensity.

2, chemical pump and the transmission shaft are in rigid connection. Because the manufacture, installation, operation shaft concentric with the shaft, causing the pump vibration; vibration motor, shaft and other source is passed directly to the pump, the formation of the superposition of vibration, and further increase the pump vibration. In addition, increase the pump bearings are exposed to external forces the rigid connection, resulting in fever of bearings, affect the pump shaft.

Two, pump transformation

In view of the above reason, we take the following two steps transformation.

1, strengthening the pipe stiffness. Taking into account of the pump is more difficult to weld reinforcement, " ribs" approach in the pump outlet pipe. Along the direction of the water, in the connection between the steel flanges at both ends of pump outlet diffuser and the water outlet valve, with 8 thickness of 32mm, width of 100mm steel plate welding. Increase the stiffness of steel, reduce the deformation resistance, the pump displacement. After measuring, after the reinforcement, the point of displacement pump A to 0.35mm.

2, transformation of transmission system. Vibration in order to reduce the motor, transmission shaft to pump delivery, the water pump and the transmission shaft is rigidly connected to the elastic connection. The use of GB4323-84 elastic dowel pin shaft coupling, pump the maximum compensation displacement of 0.6mm, compensation angle is 1° 30?. In this way, the vibration motor, the drive shaft can be compensated through the flexible coupling, can not be directly transmitted to the water pump.

Three, the modification results

After the transformation, the measurement, chemical pump vibration is reduced by the transformation of vibration velocity for 1.48cm/s 4.3cm/s. According to the vibration intensity standard ISO2372-1974 can determine, pump running in good area. At the same time, the pump running smoothly, just normal maintenance on the bearings, shaft is no wear and tear phenomenon, indicating a successful transformation.

Large vertical centrifugal pump during operation, vibration, upper and lower bearings often fever, damaged, or even the pump shaft and bearing joints wear. Water pump instability, affecting the normal water supply, need to be damping control.

Analysis, chemical pump vibration

1, home-made vertical pump 28SLA-10 is transformed from direct horizontal pumps. Motor base and the vertical height between the pump base 4.3m, the drive shaft weighing 3T. Relative to the horizontal pump, it adds a length of 3752mm diameter and 140mm in the middle shaft. In the structure, in addition to the installation of a bearing on the intermediate shaft, without any modification. The four pumps operating pressure for a long time 0.7 ~ 0.85MPa. In the high lift, large flow conditions, such a high center of gravity, the mass of high-speed rotation system, the centrifugal force is large, will cause the vibration of a larger unit. Bracket and pump out the water direction of connection stiffness is not enough, leading to the pump and the connecting piece has a larger displacement. When the pump is running to cause the displacement change, on the bearing load conditions of vibration increase, so easy to heat. If the pump displacement correction, to improve the bearing load conditions, the system can reduce the vibration intensity.

2, chemical pump and the transmission shaft are in rigid connection. Because the manufacture, installation, operation shaft concentric with the shaft, causing the pump vibration; vibration motor, shaft and other source is passed directly to the pump, the formation of the superposition of vibration, and further increase the pump vibration. In addition, increase the pump bearings are exposed to external forces the rigid connection, resulting in fever of bearings, affect the pump shaft.

Two, pump transformation

In view of the above reason, we take the following two steps transformation.

1, strengthening the pipe stiffness. Taking into account of the pump is more difficult to weld reinforcement, " ribs" approach in the pump outlet pipe. Along the direction of the water, in the connection between the steel flanges at both ends of pump outlet diffuser and the water outlet valve, with 8 thickness of 32mm, width of 100mm steel plate welding. Increase the stiffness of steel, reduce the deformation resistance, the pump displacement. After measuring, after the reinforcement, the point of displacement pump A to 0.35mm.

2, transformation of transmission system. Vibration in order to reduce the motor, transmission shaft to pump delivery, the water pump and the transmission shaft is rigidly connected to the elastic connection. The use of GB4323-84 elastic dowel pin shaft coupling, pump the maximum compensation displacement of 0.6mm, compensation angle is 1° 30?. In this way, the vibration motor, the drive shaft can be compensated through the flexible coupling, can not be directly transmitted to the water pump.

Three, the modification results

After the transformation, the measurement, chemical pump vibration is reduced by the transformation of vibration velocity for 1.48cm/s 4.3cm/s. According to the vibration intensity standard ISO2372-1974 can determine, pump running in good area. At the same time, the pump running smoothly, just normal maintenance on the bearings, shaft is no wear and tear phenomenon, indicating a successful transformation.


Copyright:Subao Pump Co.,Ltd.-Kunshan Branch Address:Kunshan City Kunjia Road Punta money Road intersection south 100 meters Contact:Miss Ren

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