Water ring pump advantages and disadvantages

Water ring pumps and other types of mechanical vacuum pump compared to the following advantages:

Water ring pump advantages (1) simple structure, manufacturing precision is not demanding, easy processing.

Water ring pump advantages (2) compact structure, higher pump speed, the general direct connection with the motor, without deceleration device. Therefore, with a small structure size, you can get a large displacement, covers an area is small.

Water ring pump advantages (3) The compressed gas is basically isothermal, that is, small changes in the temperature of the compressed gas process.

Water ring pump advantages (4) As there is no metal friction within the pump cavity surface, no lubrication of the pump, and wear small. The seal between the rotor and the retainer can be made directly from the water seal.

Water ring pump advantages (5) uniform suction, stable and reliable, easy to operate, easy maintenance.

Water ring pumps also have their drawbacks:

Water ring pump shortcomings (1) low efficiency, generally about 30%, preferably up to 50%.

Water ring pump shortcomings (2) low degree of vacuum, not only because of the structural constraints, more importantly, the working fluid saturated vapor pressure limit. 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 their inefficiencies, they are still widely used.

Paper packaging glue