Centrifugal pump having low flow diffuser
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United States of America Patent
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Dec 16, 1986
Grant Date -
N/A
app pub date -
Jul 25, 1983
filing date -
Jul 25, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A centrifugal main fuel pump (10') for a gas turbine engine has a housing (18') in which a centrifugal impeller (12') is mounted for rotation. The impeller discharges flow to a collector (20') and diffuser (22'). A low flow diffuser (26) has its inlet opening positioned closely adjacent the outer periphery of the impeller. Proper design and placement of the low flow diffuser ensures that a high percentage of the fluid energy available in the high velocity flow adjacent the impeller outer periphery is recovered as pressure rise. The low flow diffuser produces adequate fuel flow at the pressure necessary for engine light-off while the first mentioned diffuser recovers a lower pressure rise but is adapted to supply higher engine fuel flow demand in the normal range of operation. A check valve (34) prevents flow from the low flow diffuser from returning to the impeller. The check valve opens to allow the first mentioned diffuser to supply fuel when its discharge pressure exceeds that of the low flow diffuser. The addition of the low flow diffuser to the centrifugal pump results in minimal additional parasitic power loss, cost and complexity.
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