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The type of water ring vacuum pump is mainly determined by the amount of pumping gas required by customers, the vacuum degree or exhaust pressure when working.

When selecting water ring vacuum pump, the following two aspects should be paid attention to:

1. When choosing the water ring vacuum pump, it is required to be used in the high efficiency area as far as possible, that is to say, it should be operated in the area of critical vacuum degree or critical exhaust pressure.

2. At the same time, avoid operating near the maximum vacuum or maximum exhaust pressure. In this area, not only the efficiency is very low, but also the work is very unstable, easy to produce vibration and noise. Therefore, the selection of water ring vacuum pump should be carried out by manufacturers or professionals. Water ring vacuum pump parameters for reference only!

At the same time, when the water ring vacuum pump operates in high vacuum for a long time, cavitation often occurs in the high vacuum area. The obvious sign of this phenomenon is the noise and vibration in the pump. Cavitation will lead to the damage of pump body, impeller and other parts, so that the pump can not work.

According to the above principles, when the vacuum degree or gas pressure required by the water ring vacuum pump is not high, it can be preferentially selected from the single-stage pump. When the vacuum pump has a higher air volume, or the vacuum pump can not meet the requirements of two-stage vacuum pump when the air volume is higher. If the vacuum degree is higher than - 710mmhg, the combination of water ring vacuum pump and zkb-p atmospheric ejector or roots water ring vacuum unit can be selected as the vacuum pumping device.

If it is only used as vacuum pump, it is better to choose single-stage water ring vacuum pump. Because the single-stage water ring vacuum pump is simple in structure, easy to manufacture and maintain, and has good cavitation resistance under high vacuum conditions. If it is only used for compressor with larger air volume, it is more suitable to select double-stage water ring vacuum pump. Because the double-stage water ring vacuum pump has large air volume, small volume and light weight, the radial force can be automatically balanced, and the shaft is not easy to produce fatigue fracture, which makes the service life of the water ring vacuum pump longer.

The water ring vacuum pump is selected according to the air volume required by the system. After the type of water ring vacuum pump is preliminarily selected, the type of water ring vacuum pump needs to be selected according to the air volume required by the system. The selection of pumping speed and calculation of pumping time of vacuum pump can refer to vacuum calculation formula.