Vane pump

Details Vane pump Vane pump

1995-12-13

1998-02-24

Freay, Charles G.

Rotary expansible chamber devices

Apertured bypass to pressurize or relieve working chamber...

418261, 417310, 452 41, F01C 2100, F04B 4900

Patent

active

057206031

ABSTRACT:
The present invention refers to a vane pump used for dividing a pasty and compressible substance into portions and comprising a pump housing and a rotor which is arranged eccentrically in said pump housing and which is adapted to be rotated, and further comprising vanes which are supported within said rotor such that they are radially displaceable, said vanes defining with the wall of the pump housing, the base and the cover of said housing, as well as the outer surface of the rotor, vane cells and cooperating sealingly with said components, and said pump housing having an inlet and an outlet which have arranged between them a compression sector and a dosing sector, and a pressure-relief valve being arranged at least in the area of the dosing sector. In order to improve the vane pump still further, the present invention provides the feature that a back-flow passage is arranged in such a way that, when the pressure-relief valve responds, said valve will connect the interior of the pump housing via the back-flow passage to the inlet.

REFERENCES:
patent: 3473478 (1969-10-01), Little et al.
patent: 4761121 (1988-08-01), Battista et al.
patent: 4971528 (1990-11-01), Hodgkins et al.
patent: 5069608 (1991-12-01), Rather
patent: 5127382 (1992-07-01), Sowards
patent: 5380240 (1995-01-01), Staudenrausch

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