Gas pump of a liquid-ring type

Claim 1

A gas pump of the liquid-ring type for pumping a medium, comprising a rotor having impeller vanes uniformly distributed over its periphery, a housing structure containing the rotor and forming around said rotor an annular racing space for a centrifugally formed ring of liquid having respective arcuately spaced localities where the liquid ring during pump operation enters the most and the least respectively into the intervane spaces of said rotor, said housing structure having a first suction opening and a pressure opening at said localities and having respective suction and pressure duct means communicating with said space through said two openings, said housing structure having at least one additional suction opening located between said first suction opening and said pressure opening, said additional suction opening having its leading end, relative to the direction of rotor rotation, spaced from the lagging end of said first suction opening an arcuate amount at least equal to a vane division of said rotor, and another suction duct communicating with said space through saiD additional suction opening, said medium drawn through said first and additional suction openings and leaving said pump through said pressure opening. CM,2Gas pump according to claim 1, said additional suction opening extending to the region where said liquid ring reenters into said intervane spaces of said rotor.