Patent ID: 6244830
Filing Date: 2001-06-12
Classification: F01C,F04C

Abstract:
A vane-cell pump, including:a housing;a lifting ring within the housing, that forms at least one suction region and one pressure region;a rotor mounted for rotation within the lifting ring, the rotor having a circumferential surface and radial slots that are arranged on the circumferential surface of the rotor;a plurality of radially spaced apart vanes having lateral edges and arranged in said slots in a radially movable manner so as to cooperate with said lifting ring to form lower vane chambers between adjacent vanes;first and second stationary, lateral surfaces carried on at least one of said housing and said lifting ring, said lateral surfaces adjoining the rotor and the lateral edges of the vanes in a sealing manner;said first lateral surface comprising a groove that extends within the range of motion of the lower vane chambers and is open toward these lower vane chambers;said second lateral surface defining a lower vane pocket which is coupled to the pressure region, extending a predetermined angular amount over an angular range of travel of said rotor, being located in the suction region and also within the range of motion of the lower vane chambers;a fluid connection between the lower vane pocket and the groove, formed by the lower vane chambers that are currently situated within the region of the lower vane pocket;at least one lower vane pressure pocket that is located in the pressure region and also within the range of motion of the lower vane chambers, being also defined by the second lateral surface; andthe lower vane chambers having outer surface portions defined while the lower vane chambers reside within the lower vane pocket, said outer surface portions defined by a cross sectional plane passing through the region of the lower vane pocket and through a lower vane chamber located within the lower vane pocket, with the outer surface portions of the lower vane chambers remaining substantially constant during the revolution of the rotor.