| 摘要 |
An impeller-type pump includes a housing with an internal chamber, a rotor within the chamber and a vane mounted to the housing for reciprocating action such that an end of the vane contacts the rotor and effectively divides the chamber between induction and exhaustion rotor chambers. The rotor has a non-circular cross-sectional configuration, such that its outside surface forms a camming surface that drives the vane in a reciprocating fashion upon rototation of the rotor. The rotor may be oval in cross section or have a complex cross-sectional configuration with a substantially flat trailing face forming a stop to prevent reverse direction rotation, and a curved leading face which forms a cam surface to elevate the vane upon rotation of the rotor.
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