Patent ID: 6435851
Filing Date: 2002-08-20
Classification: F01C,F04C,F05C

Abstract:
A rotary vane pumping machine have a core structure and peripheral components interfacing with the core structure, the core structure comprising:a stator assembly comprising an annular ring, the inner circumferential surface of the annular ring defining a contoured surface of a stator cavity; a rotor spinning around an axis of a rotor shaft, the rotor shaft axis being a fixed rotational axis relative to the stator cavity, the rotor having a plurality of radial vanes slots and the rotor and stator being in relative rotation; a plurality of vanes, each of the plurality of vanes sliding with at least one of a radial and axial component of vane motion within a corresponding radial vane slot of the rotor, and each of the plurality of vanes having side walls, a tip portion, and a base portion, the base portion having one or more tabs extending from at least one axial end of the vane; a guidance device engaging the tabs to control radial movement of the vanes; a first end plate adjacent a first axial side of the rotor; and a second end plate adjacent a second axial side of the rotor such that the rotor is located between the first and second end plates, wherein the rotor shaft extends through at least one of the first end plate and second end plate, wherein an outer circumferential surface of the rotor comprises an annular sealing lip extending axially toward respective of the first end plate and the second end plate, wherein the plurality of vanes, the stator cavity, and the rotor define a plurality of chamber cells, wherein the vane tip portion and the contour of the stator cavity are spaced apart by a radial clearance, wherein the stator assembly, rotor, first end plate and second end plate together define a first combined core structure, and wherein the first combined core structure is substantially comprised of an invar-class alloy.