The characteristics of the water ring pump are simple and compact structure; the rotor can be directly connected with the motor. No speed change device is required; the exhaust is uniform and the exhaust volume is large; the wearing parts are few, and the work is reliable; except the bearing needs to be lubricated, other parts do not need Lubrication; but due to the existence of water and water vapor partial pressure in the pump, a high degree of vacuum cannot be generated (vacuum reaches 70%~90%).

The water ring vacuum pumps in use include single-stage, multi-stage and single-stage cascaded water-ring vacuum pumps with ejectors. The two-stage water-ring vacuum pump has a higher ultimate vacuum than the single-stage water-ring vacuum pump, and the curve of the suction volume is flatter, so it is suitable for the work occasions that still require a large suction volume under higher vacuum. The two-stage water ring vacuum pump can also be used as a secondary booster pump for high vacuum pumps such as water vapor jet. The two-stage water ring vacuum pump has two-stage impellers connected in series on the same shaft, and the main shaft is directly connected to the driving device.

The two-stage water ring vacuum pump used in the condenser of the power station has two operation modes when evacuating: in the starting condition of low vacuum, the absolute pressure of the condenser and other vacuum systems is 14665.2Pa, which can be Under normal operating conditions under high vacuum, the absolute pressure of the condenser is 5999.4Pa, which can be operated in two stages.

The tandem vacuum pump used in the power station is to connect an ejector to the inlet of the water ring vacuum pump to improve the suction vacuum. The air is used as the working medium, and it is ejected from the nozzle at a high speed. The ejected gas is pumped out, and then enters the water ring vacuum pump, where it continues to be compressed. Finally, it is discharged to the gas and water separation box.