The principle of cavitation damage of liquid ring vacuum pump is the same as that of centrifugal pump. It is at the place where the bubbles are produced and broken, and there is cavitation on the metal surface, which will cause honeycomb damage seriously. If there is a large residual stress in the cavitation part of the vacuum pump impeller, it will cause stress release and crack.
Because of the pump cavitation, the bubble burst continuously in the high pressure area, and accompanied by strong water hammer, the surface produced noise and vibration. You can hear the sound of chopping like peas. The results show that the vibration frequency caused by cavitation is 600 ~ 25000hz and the pressure is 49MPa
If the above bubbles break on the metal surface, the metal surface will be subjected to continuous and strong water hammer, and there will be pockmarks, the metal grains will loosen and peel off to form honeycomb, or even perforation. In addition to mechanical action, cavitation damage is accompanied by many complex actions such as electrolysis and chemical corrosion. The actual damage shows that the location of cavitation damage is exactly where the bubble disappears.
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