Pumps – Diverse pumps – Including rotary nonexpansible chamber type
Patent
1997-11-14
2000-02-08
Thorpe, Timothy S.
Pumps
Diverse pumps
Including rotary nonexpansible chamber type
417 87, 417251, 417299, 60734, F04B 2314
Patent
active
060221976
ABSTRACT:
Difficulties in adapting centrifugal pumps for use as fuel pumps for turbine powered aircraft are avoided in a system including a centrifugal volute pump (22) on a common shaft (18) with a regenerative pump (24). A pressure responsive throttling valve (46) is connected to the inlet (50) of the regenerative pump (24) so as to cause the regenerative pump (24) to provide fuel at a desired, substantially constant pressure while a check valve (80) is connected to the outlet (72) of the centrifugal volute pump (22) to allow flow from the volute (72) but not the reverse. The outlet side of the check valve (80) can also be selectively connected to the outlet (84) of the regenerative pump (24) so that when the pumps are rotating relatively slowly, the regenerative pump (24) will pump fuel at the desired, substantially constant pressure and, as rotational speed increases, the check valve (80) will open when the centrifugal volute pump (22) is pumping fuel at or about the desired substantially constant pressure.
REFERENCES:
patent: 4607486 (1986-08-01), Cole
patent: 4864815 (1989-09-01), Cygnor
patent: 5123810 (1992-06-01), Hansen
Cygnor John Edward
Miller Jeff Clark
Gartenberg Ehud
Sundstrand Corporation
Thorpe Timothy S.
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