Pump assembly and operating method

Details Pump assembly and operating method Pump assembly and operating method

1982-09-24

1985-01-15

Gluck, Richard E.

Pumps

Processes

417203, 417205, 417299, 418177, F04B 2314, F04B 4900, F01C 100

Patent

active

044936168

ABSTRACT:
An improved pump assembly is used to supply fuel to an aircraft engine and includes a positive displacement pump which supplies fuel during low speed operation of the pump assembly and a centrifugal pump which supplies fuel during relatively high speed operation of the pump assembly. The positive displacement pump has a plurality of vanes connected with an impeller of the centrifugal pump. The vanes are forced radially inwardly against a stationary cam surface by fluid pressure. The fluid pressure is conducted from an outlet of the positive displacement pump through a passage in the impeller of the centrifugal pump to pressure chambers disposed at outer ends of the vanes. By providing the fluid pressure passage in the impeller of the centrifugal pump, the axial length of the pump assembly tends to be minimized. The positive displacement pump is rendered ineffective to pump fluid when the output pressure from the centrifugal pump equals the output pressure from the positive displacement pump. When the positive displacement pump is ineffective, the components of the positive displacement pump are lubricated by fluid which flows from the positive displacement pump to the centrifugal pump through a common drive shaft for the two pumps.

REFERENCES:
patent: 3102494 (1963-09-01), Adams
patent: 3128708 (1964-04-01), Henning
patent: 3560120 (1971-02-01), Gannaway et al.
patent: 3851998 (1974-12-01), Downing
patent: 3941505 (1976-03-01), Nasvytis et al.
patent: 4247263 (1981-01-01), Pech et al.

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