Advantages and disadvantages of water ring vacuum pumps

Advantage

1. The structure is simple, the manufacturing accuracy is not high, and it is easy to process.

2. The structure is compact, the speed of the pump is high, and it can generally be directly connected with the motor without a deceleration device. Therefore, with a small structural size, a large exhaust volume can be obtained, and the floor space is also small.

Compressed gas is basically isothermal, and the temperature of the compressed gas process changes very little.

3. Because there is no metal friction surface in the pump chamber, there is no need to lubricate the pump, and the wear is very small. The sealing between the rotating and fastening parts can be done directly by the water seal. Uniform suction, stable and reliable work, simple operation and convenient maintenance.

Disadvantage

1. The efficiency is low, generally about 30%, and the better one can reach 50%.

2. The vacuum degree is low, which is not only limited by the structure, but more importantly, limited by the saturated vapor pressure of the working liquid. With water as the working liquid, the ultimate pressure can only reach 2000~4000Pa. Oil is used as working fluid, up to 130Pa.

3. Because the gas compression in the water ring pump is isothermal, it can remove flammable and explosive gases. Since there is no exhaust valve and friction surface, dusty gases, condensable gases, and gas-water mixtures can be extracted. With these outstanding features, it is still widely used despite its low efficiency.