Variable fluid volume vane pump arrangement

Details Variable fluid volume vane pump arrangement Variable fluid volume vane pump arrangement

1993-03-04

1994-11-22

Vrablik, John J.

Rotary expansible chamber devices

With changeable working chamber magnitude

Spring or fluid biased movable member

418 27, 418 30, F04C 2344, F04C 1504

Patent

active

053663543

ABSTRACT:
A noise and cavitation suppressing variable fluid volume vane type rotary pump has fluid inlet and outlet ports in communication with the interior portion of a pump housing. A cam ring is arranged in an inner chamber of the pump housing, for enabling adjustment of fluid flow volume in the pump, and the cam ring is pivotable for allowing eccentric displacement thereof. A rotor having a plurality of vanes arranged in the radial direction thereof so as to make touching contact with an inner circumferential surface of the cam ring is rotatably arranged in the space defined within the inner circumference of the cam ring. First and second containments are defined at uppermost and lowermost points between the cam ring and the rotor. The cross sectional areas of the containments vary according to eccentric displacement of the cam ring. Concave recesses are also formed in the inner circumferential surface of the cam ring in the vicinity of the inlet and outlet ports, along with communication grooves having respective cross sectional areas and formed at locations corresponding to those of the containments. A regulating piston is operatively associated with the cam ring such that fluid variation in a fluid chamber regulates the piston such that the piston applies pressure for eccentrically displacing the cam ring. Displacement of the cam ring varies the cross sectional areas of the containments and controls an output volume of fluid through the outlet port of the pump.

REFERENCES:
patent: 2433484 (1947-12-01), Roth
patent: 2811926 (1957-11-01), Robinson, Jr.
patent: 4558998 (1985-12-01), Kiyoshige et al.
patent: 5090881 (1992-02-01), Suzuki et al.

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