Gerotor pump

Details Gerotor pump Gerotor pump

1998-04-27

2000-08-22

Yuen, Henry C.

Pumps

Diverse pumps

Including rotary nonexpansible chamber type

4174236, F04B 2314

Patent

active

061062405

ABSTRACT:
A gerotor pump including a ring gear and a pinion gear supported on a pump housing for rotation about parallel, laterally separated centerlines. A plurality of pump chambers defined by the teeth of the ring and pinion gears expand in an inlet half of a crescent-shaped cavity between the ring and pinion gears and collapse in a discharge half. An inlet port in a first side wall of the pump housing faces the inlet half of the crescent-shaped cavity. A primary discharge port in an opposite second side wall of the pump housing faces the discharge half of the crescent-shaped cavity and is timed relative to the inlet port for pumping low bulk modulus fluid. A shallow groove in the first end wall of the housing defines a secondary discharge port timed relative to the inlet port for pumping high bulk modulus fluid. In the timing interval between the secondary and the primary discharge ports, i.e. when the pump chambers overlap only the secondary discharge port, the shallow groove defines a restricted passage which releases high bulk modulus fluid to prevent pressure spikes while maintaining sufficient back pressure to collapse entrained vapor bubbles in low bulk modulus fluid.

REFERENCES:
patent: 2544144 (1951-03-01), Ellis
patent: 3204564 (1965-09-01), Eltze
patent: 3680989 (1972-08-01), Brundage
patent: 3834842 (1974-09-01), Dorff et al.
patent: 4199305 (1980-04-01), Pareja
patent: 4231726 (1980-11-01), Cobb et al.
patent: 4897025 (1990-01-01), Negishi
patent: 4978282 (1990-12-01), Fu et al.
patent: 5046933 (1991-09-01), Haga et al.
patent: 5145348 (1992-09-01), Zumbusch
patent: 5393203 (1995-02-01), Hantle

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