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Cavitation and its damage (1) Cavitation production Liquid ring vacuum pump works as shown in Figure 2-92. Liquid ring vacuum pump is usually used to do the working fluid, you can also use ethylene glycol, toluene and other liquids do working fluid. Each liquid has a corresponding saturated vapor pressure at a certain temperature. When the liquid ring vacuum pump is in operation, the suction chamber is communicated with the system to be evacuated, and when the vacuum (absolute pressure) formed by the suction chamber is closer to the saturated vapor pressure of the working liquid, the degree of bubbles on the inner surface of the liquid ring in this area It will be higher, or even reach boiling conditions. As the impeller rotates, the air bubble is crushed and crushed when air bubbles sandwiched between two adjacent blades enter the compression and discharge area. Liquid ring surface of the bubble generation, rupture phenomenon known as the liquid ring vacuum pump cavitation phenomenon. (2) Cavitation damage to the liquid ring vacuum pump â‘ reduce the suction capacity. In the suction area, air bubbles generated on the inner surface of the liquid ring fill the "aspiration air" surrounded by the inner surfaces of the two vanes, the hub and the liquid ring, reducing the suction capacity of the vacuum pump to the pumping system. Severe cavitation, "breathing space" will be vacuum pump their working fluid bubble completely filled, the pump's actual pumping capacity will be reduced to zero pumping capacity. â‘¡ produce vibration and noise. Bubble rupture will produce vibration and will emit significant cavitation noise, cavitation serious, will issue a similar metal percussion. â‘¢ cavitation will damage the hub surface, leaves.