Water ring pump and other types of mechanical vacuum pump has the following advantages compared to: simple structure, low manufacturing precision, easy processing. Compact structure, high pump speed, the general direct connection with the motor, without deceleration. Therefore, with a small structure size, you can get a large displacement, covers an area is small. Compressed gas is basically isothermal, that is, compressed gas process temperature changes very small. Since there is no metallic friction surface in the pump chamber, there is no need to lubricate the pump and the wear is minimal. The seal between the rotor and the retainer can be made directly from the water seal. Inspiratory uniform, stable and reliable, easy to operate, easy maintenance. Water ring pumps also have their drawbacks: low efficiency, typically around 30%, better up to 50%. The vacuum is low, not only because of the structural limitations, but more importantly because of the saturated vapor pressure of the working fluid. Water for the working fluid, the ultimate pressure can only reach 2000 ~ 4000Pa. Oil for the working fluid, up to 130Pa. In short, due to the water ring pump gas compression isothermal, it can be extracted flammable and explosive gases. Because there is no exhaust valve and friction surface, it can be extracted with dust gas, condensable gas and water-air mixture. With these outstanding features, despite its inefficiency, it is still widely used.
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