Progressive staged flow to precompress the pump internal...

Details Progressive staged flow to precompress the pump internal... Progressive staged flow to precompress the pump internal...

2006-11-02

2009-11-17

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Grooved abutting cylinder-rotating member end surfaces

Radial groove

C418S061300, C418S132000, C418S133000, C418S171000, C418S259000

Reexamination Certificate

active

07618247

ABSTRACT:
Besides the conventional pump timing in rotary hydraulic devices, a series of constant and variable restrictions have been applied to condition the pressurized flow used to internally precompress the volume or volumes to be displaced. This multiple staged orifices feature reduces the outgassing associated with the pressurized flow passing through a single restriction, such as a metering groove. The pressurization of the outgassed fluid will cause noise and erosive wear of the pump internal containment surfaces.

REFERENCES:
patent: 2989951 (1961-06-01), Charlson
patent: 5261796 (1993-11-01), Niemiec et al.
patent: 5263818 (1993-11-01), Ito et al.
patent: 6743003 (2004-06-01), Dong
patent: 06117379 (1994-04-01), None

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