Working Principle

Liquid ring vacuum pumps are of the rotary positive displacement type. There are no rotating parts other than the shaft and the multi-bladed impeller. The blades are eccentrically mounted with respect to the pump casing. The blades, extending radially from the hub, create chambers in series with the pump housing.

As the impeller rotates, the operating fluid is present in half of the rotation. This fluid, under the effect of centrifugal force, is pushed to the outer wall, forming a liquid ring that rotates at the same speed as the impeller. The created chambers are completely filled with operating fluid at the top, and as the impeller rotates, the gas coming from the suction takes the place of this fluid. As the rotation continues, this time the liquid is pushed towards the gas-filled chambers; it compresses the gas and sends it to the discharge port. This process is repeated for each chamber of the impeller, creating a continuous vacuum or pressure flow.