Liquid ring vacuum pump for gaseous media

Claim 1

In a liquid ring vacuum pump for a gaseous medium which includes a machine housing which surrounds an impeller eccentrically and is closed off at the end face by end bells for the impeller shaft, at least one end bell having a separate inlet and outlet for the medium, which are in communication, via suction and pressure slots in a flat control disc disposed between the end bell and the machine housing, with a gap between blade chambers of the impeller and the housing closed off on the circumference by a liquid ring, a pressurized liquid canal being provided in the respective control disc, said canal connected to a pressurized liquid feed line and aligned with the inlet to a pressurized liquid passage in the control disc, which is arranged below the shaft passage of the control disc at the end face facing the impeller hub, so that the pressurized liquid flows off into the liquid ring, sealing the gap, the improvement comprising the control disc having on the side facing the impeller at least one inflow channel located between the suction slot and the pressure slot as seen in the direction of rotation of the impeller, and below the shaft passage, said inflow channel extending radially over the region of the impeller hub up to the region of the blade chambers and being connected to the pressurized liquid passage; and a sump, the pressurized liquid feed line connected to the pressurized liquid canal in the control disc through said sump.