| 摘要 |
A rotary pump which includes a housing having inner and outer cylindrical surfaces defining a substantially annular internal pumping chamber. A substantially cup-shaped impeller, having inner and outer cylindrical surfaces, is movable within the chamber and is driven by an eccentric member connected to a rotary drive shaft. The position of the impeller is such that the outer housing surface and the inner impeller surface are simultaneously in substantially tangential engagement, respectively, with the outer impeller surface and the inner housing surface at diametrically opposite points of the impeller. The chamber is thereby divided into a pair of crescent-shaped compartments, the wide portion of each being proximal, respectively, to the diametrically opposite points. A flexible guide is fixed to the housing and engages the impeller within the chamber to constrain rotary movement. Inlet and outlet channels are formed in the housing on opposite sides, respectively, of the guide.
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