Internal gear type rotary pump having a relief groove

Details Internal gear type rotary pump having a relief groove Internal gear type rotary pump having a relief groove

1996-06-25

1998-01-27

Vrablik, John J.

Rotary expansible chamber devices

Grooved abutting cylinder-rotating member end surfaces

Radial groove

418102, 418171, F04C 210

Patent

active

057116601

ABSTRACT:
Along a peripheral wall surface of a pump housing at a closure portion where a working fluid in a volume chamber defined by engagement of an inner rotor and an outer rotor, is enclosed, a liquid pressure is relieved by the liquid pressure relieving groove for relieving a liquid pressure of the working fluid from the volume chamber to a sliding gap along an outer peripheral surface of the outer rotor.

REFERENCES:
patent: 1799237 (1931-04-01), Jensen
patent: 2948229 (1960-08-01), Brundage
patent: 3995978 (1976-12-01), Khan et al.
patent: 4199305 (1980-04-01), Pareja
patent: 5263818 (1993-11-01), Ito et al.

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