Balanced roller vane pump having reduced pressure pulses

Details Balanced roller vane pump having reduced pressure pulses Balanced roller vane pump having reduced pressure pulses

1986-05-01

1989-05-09

Freeh, William L.

Rotary expansible chamber devices

Vane or abutment comprises rotatable element

F04C 2344

Patent

active

048284688

ABSTRACT:
A balanced rotary pump is disclosed of the type including a pumping element (17) having a rotor member (25) defining a plurality of slots (27). Each of the slots receives a radially displaceable roller vane member (29). The pumping chamber is defined by a pair of inlet arc surfaces and a pair of discharge arc surfaces (65) of progressively decreasing radius. Each of the slots (27) includes a driving surface (73), each of which includes a substantial surface portion (77) oriented at a negative angle relative to a radial line passing through the center of the adjacent roller vane member. The engagement of each of the roller vane members (29) and its respective negative surface portion (77) is effective to act to reduce slightly the net radially outward force acting on the roller vane member, to reduce bouncing thereof as the roller vane member passes from the inlet arc surface to the discharge arc surface. The result is improved engagement of the roller vane member and the adjacent cam surface, reduced leakage past the vane member, and a reduction in pressure pulses and noise.

REFERENCES:
patent: 2830543 (1958-04-01), Roth
patent: 3025802 (1962-03-01), Browne
patent: 3412685 (1968-11-01), Connelly
patent: 4105377 (1978-08-01), Mayall
patent: 4486150 (1984-12-01), Davis
patent: 4538977 (1985-09-01), Ruhl
patent: 4659296 (1987-04-01), Bristow

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