High efficiency centrifugal pump

Details High efficiency centrifugal pump High efficiency centrifugal pump

1982-01-06

1983-10-11

Coe, Philip R.

Rotary kinetic fluid motors or pumps

Plural runners supported for relative motion or on separate...

Diverse type runners, blade systems or working fluid paths...

415143, F01D 110, F04D 1314

Patent

active

044089538

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).

REFERENCES:
patent: 803759 (1905-11-01), Herles et al.
patent: 921118 (1909-05-01), Kasley
patent: 1032828 (1912-07-01), Hayton
patent: 3930744 (1976-01-01), Theis, Jr.
patent: 4105372 (1978-08-01), Mishina et al.
Aeronautical Journal, H. S. Bottoms, Jun. 1981, pp. 230 and 231.

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