The water ring vacuum pumps in use are single-stage, multi-stage and single-stage series-connected ejector tandem water-ring vacuum pumps. The two-stage water ring vacuum pump has a higher ultimate vacuum than the single-stage water ring vacuum pump, and the suction volume curve drops more flatly, which is suitable for working situations where higher suction volume is still required 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 jets. The two-stage water ring vacuum pump is a two-stage impeller 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 operating modes when evacuating: the starting condition at low vacuum, the absolute pressure of the condenser and other vacuum systems is 14665.2Pa, which can be Stage operation; 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 increase the suction vacuum. The atmosphere is used as the working medium and is ejected from the nozzle at a high speed. The ejected gas is drawn 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 tank.