Vacuum pump classification

According to different structures can be divided into the following types

(1) Water ejection aspirator

(2) Water ring vacuum pump

(3) Roots pump: Roots pump is a vacuum pump without internal compression, usually the compression ratio is very low.

(4) Rotary vane vacuum pump: rotary vane vacuum pump (referred to as rotary vane pump) is an oil-sealed mechanical vacuum pump. Its working pressure range is 101325~1.33×10^-2(Pa) belongs to the low vacuum pump. It can be used alone, also can be used as other high vacuum pump or ultra high vacuum pump before the pump. It has been widely used in metallurgy, machinery, military industry, electronics, chemical industry, light industry, petroleum and medicine and other production and scientific research departments.

Introduction to water ring vacuum pump

1, water ring vacuum pump is the most common type of liquid ring vacuum pump. The liquid ring vacuum pump is a rotor core with multiple blades installed in the pump shell. When it rotates, it throws the liquid to the pump shell and forms a liquid ring concentric with the pump shell. The liquid ring and the rotor blade form a rotating varus vacuum pump with periodic volume changes. When the working liquid is water, it is called water ring vacuum pump.

2, the water ring vacuum pump is mainly used in the process of rough vacuum and large pumping volume. It has been widely used in chemical, petroleum, light industry, medicine and food industry, such as vacuum filtration, vacuum feeding, vacuum concentration, vacuum degasification and so on.

3，Water ring vacuum pump (referred to as water ring pump) is a coarse vacuum pump, which can obtain the limit vacuum of 2000 ~ 4000Pa, and the series atmospheric injector can reach 270~670Pa. Water ring pump can also be used as a compressor, called water ring compressor, is a low-pressure compressor, its pressure range is 1 ~ 2×10⁵Pa meter pressure.

4, water ring pump and other types of mechanical vacuum pump compared with the following advantages:

(1) Simple structure, low manufacturing accuracy requirements, easy to process.

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

(3) The compressed gas is basically isothermal, that is, the temperature of the compressed gas process changes very little.

(4) Because there is no metal friction surface in the pump cavity, no lubrication is needed in the pump, and the wear is small. The sealing between the rotating parts and the fixed parts can be completed directly by the water seal.

(5) uniform inhalation, stable and reliable work, simple operation, convenient maintenance.