Water Ring Vacuum Pump and Roots Vacuum Pump

Water ring vacuum pump is mainly used in coal mine (gas extraction), metallurgy, electrical and other industries. Roots vacuum pump (Roots pump) refers to a varactor vacuum pump with two blade-shaped rotors rotating synchronously in opposite directions. There is a small gap between the rotors, the rotors and the inner wall of the pump housing, but there is no contact with each other.
The water ring vacuum pump is equipped with an eccentric rotor with fixed blades, which throws water (liquid) to the stator wall. The water (liquid) forms a liquid ring concentric with the stator. The liquid ring and the rotor blade together constitute a variable volume rotary variable volume vacuum pump.

Roots vacuum pump has been tested by long-term operation in petroleum, chemical industry, plastics, pesticides, steam turbine rotor dynamic balance, aerospace space simulation and other devices, so it should be vigorously promoted and applied in China. It is also widely used in petroleum, chemical, metallurgical, textile and other industries. Vacuum pump accessories for noise control of vacuum pump, vacuum pump muffler.

Roots vacuum pump is characterized by fast start-up, low power consumption, low operation and maintenance costs, high pumping speed and efficiency, insensitive to a small amount of water vapor and dust contained in the pumped gas, large pumping rate in the pressure range of 100-1Pa, and rapid elimination of sudden gas release. This pressure range is just between the oil-sealed mechanical vacuum pump and the diffusion pump. Therefore, it is often connected in series between the diffusion pump and the oil-sealed mechanical vacuum pump to increase the pumping capacity in the middle pressure range. At this time it is also called mechanical booster pump.

Water-ring vacuum pump has the advantages of simple structure, low manufacturing accuracy, easy processing, compact structure, high pump speed, and can be directly connected with the motor without deceleration device. Therefore, with small structure size, we can get large exhaust volume, small area, uniform suction, stable and reliable operation, simple operation and convenient maintenance, but the disadvantage is low efficiency, generally about 30%, better up to 50%, low vacuum.
liquid ring vacuum pump for evaporator