Cavitation damage principle of centrifugal pump

 The cavitation damage principle of liquid ring pump is the same as that of centrifugal pump. Both of them are located at the place where the steam bubble breaks out and breaks. The metal surface presents cavitation phenomenon, and severe honeycomb damage will appear. If the impeller of vacuum pump has large residual stress in cavitation part, it will cause stress release and crack. 

Because the pump cavitation, bubbles in the high-pressure area, sudden break, and with the fierce water hammer, surface attack noise and oscillation. You can hear a crackling sound like a popping bean. The measured results show that the oscillation frequency range of cavitation is 600 ~ 25000hz and the pressure is 49MPa

If the above bubbles crack on the metal surface, the metal surface will be subjected to continuous intense water hammer, showing pockmarks, and the metal grains loose and fall off into honeycomb shape, and even perforation. In addition to chemical and mechanical damage. The actual damage indicates that the cavitation damage part of the flow passage parts of the pump is the place where the bubbles disappear.

The long-term operation of liquid ring vacuum pump in cavitation state will result in the noise and oscillation of the pump, and even damage the pump. Therefore, the operation of liquid ring vacuum pump in cavitation state should be avoided as far as possible. The following methods can be adopted: under the premise that the operating point of liquid ring vacuum pump is fixed, the effect of cavitation can be avoided by lowering the temperature of working fluid.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces