Vapor core centrifugal pump having main and low flow impellers
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United States of America Patent
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-
Feb 17, 1987
Grant Date -
N/A
app pub date -
Jul 2, 1984
filing date -
Jul 2, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vapor core centrifugal fuel pumping system (10') has a main flow impeller (72) and a low flow impeller (81) mounted upon the front plate (74) of the main flow impeller. Both of the impellers receive flow from an inlet passage (26') which proceeds past an inlet throttling valve (114). During pumping operation of the low flow impeller, a surface (122) on the inlet throttling valve forms a labyrinth seal with the radially inner lip (120) of the front plate to reduce inlet fuel flow entering the main impeller. A first check valve (124) and a second check valve (126) respectively prevent flow from the low flow impeller from entering the main flow impeller and flow from the main impeller from entering the low flow impeller. The second check valve is associated with conduits (140, 142) to evaculate liquid adjacent the main impeller during operation of the low flow impeller to reduce windage losses. The pumping system does not engender excessive pressure or flow transients during changeover between low flow operation and normal flow operation. Also, the pumping system imparts minimal temperature rise to the fuel being pumped and is not susceptible to significant cavitation erosion.
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