Liquid-ring vacuum pumps are rotary positive-displacement vacuum pumps, and the impeller is eccentrically mounted inside the cylindrical intermediate body.During pump operation, centrifugal force imparts kinetic energy to the working fluid inside the pump, forming a liquid ring concentric with and closely adhering to the intermediate body. The liquid ring and rotor blades form multiple working chambers with periodically varying volumes. Fluid flows into and out of each impeller vane chamber, producing an effect equivalent to that of a piston.Near the suction port, liquid recedes from the working chambers; gas is drawn in through the guide disc from the suction inlet. Conversely, near the discharge port, the liquid ring flows into the working chambers, compressing the gas which is then discharged through the exhaust outlet.
During circulation, the working fluid not only forms the liquid ring but also dissipates substantial heat generated by gas compression. Part of the working fluid is carried away along with the discharged gas, so supplementary working fluid is required. This feature enables the compression process to approximate an isothermal condition with minimal temperature rise. Therefore, the pump is especially suitable for handling flammable and explosive gases, fundamentally eliminating potential safety hazards caused by high temperatures.
