Centrifugal pump cavitation phenomenon refers to what, how to avoid?

Category: Water pump knowledge

2024-04-25

Cavitation phenomenon of centrifugal pump refers to the phenomenon of liquid vaporization in the pump due to the decrease of pressure, resulting in gas mixing into the pump, thus affecting the normal operation of the pump. This phenomenon is common in the case of low suction pressure, high liquid viscosity, high liquid temperature.

When the liquid flow rate at the impeller inlet of the centrifugal pump increases, and the pressure is lower than the saturation pressure of the corresponding working water temperature, it will cause a part of the liquid to evaporate. When the bubbles after evaporation enter the area of higher pressure, the pressure suddenly solidifies, so the surrounding liquid is replenished here, causing hydraulic shock, this phenomenon is called cavitation.

离心泵的气蚀现象是指什么，怎么避免？

Cavitation phenomenon will have a variety of adverse effects on the centrifugal pump, first, cavitation will reduce the efficiency of the pump. When the gas is mixed into the pump, its compressibility is much greater than that of the liquid, so that the suction efficiency of the pump is reduced. Secondly, cavitation will increase the vibration of the pump, which will affect the stability of the pump. Gas in the pump evaporation and condensation of the cycle process, will cause cavitation phenomenon, resulting in bubbles impact pump shell and impeller, resulting in vibration and noise. In addition, cavitation can also cause wear and corrosion of the pump, and the compressibility of the gas will produce impact and shear forces, which will cause damage to the impeller, pump casing and other components of the pump. At the same time, cavitation will also lead to increased corrosion of the liquid in the pump, reducing the service life of the pump.

1. centrifugal pump cavitation will cause what harm?

1, reduce the performance of the pump, cavitation will cause the noise and vibration of the centrifugal pump.

2, will make the centrifugal pump flow components are corroded, damaged.

In order to avoid the cavitation phenomenon of centrifugal pump, some measures can be taken. First of all, ensure that the suction pipe of the pump is well sealed to reduce the mixing of gas at the pump inlet. Secondly, to control the suction pressure of the pump, to avoid too low suction pressure caused by liquid vaporization. In addition, regular inspection and maintenance of the working status of the pump and timely cleaning of impurities and sediments in the pump are also effective ways to prevent cavitation.

2. how to avoid centrifugal pump cavitation?

1. Reduce the flow loss on the pipeline before the pump;

2. The structure from the suction port of the pump to the vicinity of the impeller blade inlet is improved.

3. Take measures to increase the cavitation allowance of the water inlet device.

4. Lower the installation height of the suction device in front of the pump.

In short, the centrifugal pump cavitation phenomenon is a need to pay attention to the problem, to understand the causes and effects of cavitation phenomenon, to take appropriate preventive measures, can improve the efficiency of the centrifugal pump, prolong the service life, to ensure its normal and stable operation.

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