Rotary pumps or engines of the sliding, rocking, abutment type

Claim 1

A pump comprising a housing having a cavity defined by an iNternal peripheral wall and opposed end walls, a shaft rotatably supported in the housing, a piston member journalled eccentrically on said shaft to describe an orbital path within the cavity upon relative rotation between the shaft and the housing, a plurality of vanes disposed on the periphery of said piston member, one of said vanes being disposed radially and the other of said vanes being rotatably mounted on said piston member so as to move through an arc of movement, a rocking member for each said vane mounted in a mounting therefor in said body and having members defining a vane slot therein in which the appropriate vane slides, sealing means operatively disposed between each vane and the piston member, the housing peripheral wall and the housing end walls to divide the cavity into a plurality of chambers, the volume of each chamber varying as the piston member orbits and means to regulate the admission to and exhausting from each chamber in sequence of a working fluid so that orbiting of the piston member causes such working fluid to be drawn into a chamber and pumped out therefrom with a pumping action in which at least one valve for each chamber is provided by a through passageway in the rocking member of a vane associated with that chamber, said passageway coacting with parts of the mounting adjacent to which said rocking member rocks so that the parts of the mounting open and close an orifice at each end of said passageway independent of the vanes, said displacement member being a hollow cylinder, and a further displacement member mounted within said hollow cylinder, said further displacement member being provided with at least one vane and valve means, the construction and arrangement being such that said further displacement member coacts with the inner wall of said first displacement member to act as an inner pump, said further displacement member carrying a plurality of vanes sliding in rocking members, said rocking members carrying passageways having orifices adapted to coact with parts of said first displacement member to form valve means connecting appropriate chambers on said inner pump means with other passageways.