1, cavitation phenomena Liquid at a certain temperature, for some reason the pressure at the inlet of the pump is lower than the vaporization pressure (ie, saturated vapor pressure) of the liquid at the temperature, the liquid begins to vaporize to generate bubbles, and with the flow Into the high-pressure zone, the bubble burst, the surrounding liquid quickly filled the original bubble holes, resulting in a hydraulic impact. This bubble generation, development and rupture phenomenon is called cavitation. 2. Cavitation damage (1) When the bubble ruptures, the liquid particles impact each other, resulting in noise of 600-25000 Hz and vibration of the unit. The two are mutually excited to cause strong vibration of the pump, that is, cavitation resonance phenomenon. (2) over-current parts erosion and corrosion damage. (3) sudden drop in pump performance. 3, the cavitation site and the site of corrosion damage. Cavitation occurs at the impeller at the entrance, or the liquid flow at high speed where the corrosion damage often at the impeller exit or pressure water chamber exit.
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