Advantage
The structure is simple, the manufacturing accuracy requirement is not high, and it is easy to process.
Compact structure, high pump speed, generally can be directly connected with an electric motor without the need for a deceleration device. Therefore, using a small structural size can achieve a large exhaust volume and a small footprint.
Compressed gas is essentially isothermal, meaning that the temperature change during the compression process is minimal.
Due to the absence of metal friction surfaces in the pump chamber, there is no need for lubrication inside the pump, and the wear is minimal. The sealing between the rotating and fixed parts can be directly achieved by a water seal.
Uniform inhalation, stable and reliable operation, simple operation, and convenient maintenance.
Disavantage
The efficiency is low, usually around 30%, with better ones reaching up to 50%.
The low vacuum degree is not only due to structural limitations, but more importantly, it is limited by the saturated vapor pressure of the working fluid. Using water as the working fluid, the maximum pressure can only reach 2000~4000Pa. Using oil as the working fluid can reach up to 130Pa.
In short, due to the isothermal compression of gas in water ring pumps, flammable and explosive gases can be extracted. Due to the absence of exhaust valves and friction surfaces, dust laden gases, condensable gases, and gas water mixtures can be extracted. With these outstanding features, despite its low efficiency, it has still been widely applied.
