Cavitation phenomenon on the pump and its causes 1, the cavitation liquid at a certain temperature, reduce the pressure to the temperature of the vaporization pressure, the liquid will produce bubbles. The phenomenon of bubbles is called cavitation.
2, cavitation collapse Cavitation bubbles generated when the flow to high pressure Department, its volume decreases so that burst. This phenomenon of bubble disappearing in liquid due to pressure increase is called cavitation collapse.
3, the causes of cavitation and hazards Pumps in operation, if the over-flow part of the local area (usually the impeller blade inlet somewhere later) for some reason, pumping the absolute pressure of the liquid reduced to the current temperature When the liquid evaporates, the liquid begins to vaporize there, generating a large amount of steam and forming bubbles. When the liquid containing a large amount of bubbles is pushed forward through the high-pressure area inside the impeller, the high-pressure liquid around the bubbles causes the bubbles to rapidly shrink and break. At the same time as the bubbles are broken and condensed, the liquid particles fill the cavities at a very high speed, which causes a very strong water hammer at this moment and impacts the metal surface with a very high impact frequency with an impact stress of several hundreds to several thousands of atmospheres , The impact frequency of up to tens of thousands of times per second, the wall will be broken in serious cases.
4, the cavitation process in the pump bubbles and bubble rupture overcurrent components have been destroyed by the pump process is the process of cavitation. Pump cavitation in addition to the over-current components will have a damaging effect, but also produce noise and vibration, and lead to the decline in the performance of the pump, serious pump liquid will be interrupted, can not work properly.
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