High efficiency centrifugal pump
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United States of America Patent
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Oct 11, 1983
Grant Date -
N/A
app pub date -
Jan 6, 1982
filing date -
Jan 6, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high speed fuel pump for a gas turnbine engine has a positively-driven shroud (28) positioned between a main impeller (14) and the wall of a pumping cavity (12) to reduce impeller drag. The shroud is formed by a first disc (30) having a boost impeller (36) connected to its central hub portion 30a and a second disc (32) having a gear (32b) carried by its central hub portion (32a). The main drive shaft assembly (24), to which the main impeller is connected, carries a gear (64) which meshes with gear (62) mounted upon a shaft (58). The shaft (58) also carries a gear (56) which meshes with the gear 32b. The gears are sized so that the shroud is driven at one-half the speed of the main impeller in order to maximize impeller drag reduction and enhance pumping capability when severe inlet conditions are present at the pump inlet (10).
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