Cavitation mechanism and prevention of liquid ring vacuum pump in brick and tile enterprises

In the production process of sintered brick slurry, in order to promote the molding performance, uniform density and strength of slurry, make some low plasticity and inferior raw materials lose full use, and make common slurry produce thin-walled and high-strength hollow brick, usually vacuum pump is used to pump out the continuous true void of slurry, so that the vacuum degree of slurry greatly reduces the air content outside the slurry to meet the production requirements, making it lose one A decent body.

There are many kinds of vacuum pumps used in brick and tile enterprises. Liquid ring vacuum pump is a kind of rare equipment in vacuum extractor. The vacuum pump operates in high vacuum state, especially in winter, with the increase of operating liquid temperature, the liquid gasification pressure also increases. At the suction end of the vacuum pump, the bubbles in the liquid ring condense rapidly and cause the bubbles to break, which is the mechanism of cavitation in the vacuum pump. The cavitation of vacuum pump has nothing to do with the vacuum degree and working liquid temperature of vacuum pump, and nothing to do with the development of vacuum pipeline and compression ratio. In this case, any vacuum pump will produce cavitation, so no matter how large the structure and compression ratio of the vacuum pump, the opposite vacuum will be formed on the suction side of the vacuum pump, thus cavitation will be generated.

In the operation process of vacuum pump, it is necessary to work as efficiently as possible, that is, in the sea area with critical vacuum degree or critical exhaust pressure, it is necessary to prevent the operation close to the maximum vacuum degree or maximum exhaust pressure. In this sea area, not only the efficiency is very low, but also the operation is very balanced and solid, which is easy to produce vibration and noise. For the vacuum pump with high vacuum degree, cavitation will occur when it is operated in this sea area. The obvious signs of this phenomenon are noise and vibration in the pump. Cavitation will cause mechanical damage such as pump body and impeller, resulting in the pump helpless operation.

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