The pressure of the residue pump fluid drops from the inlet of the pump to the inlet of the impeller, and the pressure of the liquid near the blade is the lowest. Due to the local part of the overcurrent part, the absolute pressure of the pumping liquid drops to the vapor pressure under the current temperature , The liquid is vaporized there and there may be overflow of the solution in the liquid to form many bubbles which flow forwards with the liquid and the pressure of the liquid outside is higher than that of the bubble Of the vapor pressure of the bubble will be dramatically reduced to the formation of cracks and cracks in the bubble shrinkage rupture at the same time, will have a great impact pressure, its value up to hundreds of atmospheres, the formation of water hammer, continuous blow metal surface, metal surface due to Impact and fatigue spalling. The occurrence of this phenomenon makes the overcurrent component corroded and destroyed, and the above-mentioned bubbles and bubbles are sharply reduced and the destruction of the overcurrent component ruptured is the reason of the cavitation during the operation of the residue pump. Oil pump pump running for a long time under the corrosion of the pump overcurrent part of the corrosion damage, which is due to the condensation of the metal surface is a strong impact on the metal surface pitting, serious, leading to loose metal particles and flaking, showing honeycomb Shaped, and even cause perforation, cavitation in addition to the destruction of mechanical force is also accompanied by electrolytic chemical corrosion and Other complex forces, practice has proved that cure cavitation must prevent the operation of the pump flow channel bubbles.
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