As the pressure at the inlet of the impeller is lower than the saturation pressure of the working water temperature, a portion of the liquid is caused to vaporize (ie, vaporize). After the vapor bubbles into the area of ​​high pressure, the pressure suddenly condenses, so the liquid around here to replenish, resulting in hydraulic impact, a phenomenon known as cavitation. This continuous local impact load, the material will gradually fatigue damage the surface, causing the metal surface erosion, and then the size of cellular cavities. In addition to the damage caused by the impact of metal parts, but also chemical corrosion, that is, at the same time, the liquid also precipitated oxygen, oxidation occurs. Cavitation instability, causing the pump vibration and noise, and at the same time as the vortex cavitation plug block impeller, so at this time flow, lift are reduced, the efficiency decreased. So do not want to cavitation phenomenon. In order to prevent cavitation, the pump mechanism used the following measures: First, the use of double suction impeller; Second, to increase the inlet area of ​​the impeller; Third, to increase the width of the blade inlet edge; Fourth, increase the front and rear cover of the impeller turn Radius of curvature; Fifth, the blade inlet to the suction side of the extension; Six, the first impeller using anti-cavitation material; For the existing pump, to prevent cavitation measures are: First, the flow rate of some cross-section change rate, wall smooth; Second, the suction pipe resistance to be small and short and straight; Third, the correct choice of suction height; Fourth, Cavitation area epoxy resin coating. Pump cavitation occurs frequently in power plants condensate pump, heater drain pump, circulating pump and so on.
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