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The water ring vacuum pump (referred to as water ring pump) is one of the water pumps, which can obtain the limit vacuum of 2000 ~ 4000Pa, and the series atmospheric ejector can reach 270 ~ 670pa. The water ring vacuum pump can also be used as compressor, called water ring compressor, which belongs to low pressure compressor, and its pressure range is 1 ~ 2 × 105Pa gauge pressure.

Water ring vacuum pump has its own unique characteristics: compact structure, stable and reliable work and uniform flow. It is often used to transport or pump flammable, explosive and corrosive gases in chemical production. The efficiency of water ring vacuum pump is very low because of the loss of energy due to impeller stirring liquid.

advantage

The structure is simple, the manufacturing precision is not high, and it is easy to process.

Compact structure, high speed pump, generally can be directly connected with the motor, no reduction device. Therefore, with a small structure size, we can obtain large exhaust volume and small floor area.

Compressed gas is basically isothermal, that is to say, the temperature change of compressed gas process is very small.

Because there is no metal friction surface in the pump cavity, there is no need to lubricate the pump, and the wear is very small. The seal between the rotating part and the fixed part can be directly completed by the water seal.

It has the advantages of uniform suction, stable and reliable operation, simple operation and convenient maintenance.

shortcoming

The efficiency is low, generally about 30%, and the better one can reach 50%.

The vacuum degree is low, which is not only due to the structural constraints, but also to the saturation vapor pressure of the working solution. When water is used as working fluid, the limit pressure can only reach 2000 ~ 4000Pa, and when oil is used as working fluid, it can reach 130pa.

In short, as the water ring pump gas compression is isothermal, it can be pumped out flammable, explosive gas. Since there is no exhaust valve and friction surface, the dust gas, condensable gas and gas water mixture can be removed. With these outstanding characteristics, although it is inefficient, it is still widely used.