Pump Cavitation and Its Harm

Cavitation phenomenon and its harm (1) cavitation phenomenon Liquid at a certain temperature, due to the dynamic role of liquid metering pump at the inlet pressure is lower than the pressure of the liquid at this temperature vaporization pressure (ie, saturated vapor pressure) Liquid began to vaporize and produce bubbles, and with the flow into the high-pressure zone, the bubble burst, the surrounding liquid quickly filled the original bubble cavity, resulting in local high-speed high-pressure strike force. This bubble generation, development and rupture phenomenon is called cavitation. (2) Cavitation damage (1) When bubbles rupture, liquid particles interact with each other to produce high-frequency impact of 600 to 25000 Hz on the metal over-current surface, and repeated many times per second. This phenomenon generates noise and occurs in severe cases Unit vibration. â‘¡ flow component pitting damage and corrosion caused by high temperature and chemical damage, the two can interact. â‘¢ pump performance decline. With the increase of specific rotation, the decline slowed down. (3) Where cavitation occurs and where corrosion is likely to occur Cavitation occurs at the low-pressure side of the impeller blades near the entry edge and at the front cover, where the curvature is greatest. Axial and no-hood high-specific-rotation impellers, the low-pressure side of the impeller edge and close to the tip of the space at the cavitation-sensitive. The cavitation of the pump housing occurs on the low pressure side of the pump and on the low pressure side of the vane, near the entry side. For multi-stage pumps, cavitation is usually confined to the first stage. Corrosion pump corrosion damage is where the bubble disappears, usually at the impeller exit and pressurized water chamber entrance.


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