Aircraft pump system with internal pressure control, comprising a regenerative pump and a centrifugal pump
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Feb 8, 2000
Grant Date -
N/A
app pub date -
Nov 14, 1997
filing date -
Nov 14, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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