Efficiency fluid pumping system including sequential unloading o

Details Efficiency fluid pumping system including sequential unloading o Efficiency fluid pumping system including sequential unloading o

1978-11-08

1981-01-20

Gluck, Richard E.

Pumps

With condition responsive pumped fluid control

Plural pump units with individual or relative control

417288, F04B 4908

Patent

active

042459648

ABSTRACT:
In a fluid pumping system in which a fluid is pumped from a fluid supply to a load, two continuously driven fixed displacement pumps are operated in parallel to provide the pumping action. The two pumps are arranged with a common inlet, and with a common outlet, the flow delivered to the load from one of the two pumps passing through a check valve upstream of the common outlet. The fluid flow is regulated to provide a constant pressure by sequentially bypassing fluid around each pump through separate pump bypass ducts. This sequential fluid bypassing or pump unloading is effected by a single control responsive to the flow requirements of the load necessary to maintain that constant pressure. The pump whose delivered flow outlet contains the check valve is the pump whose flow is bypassed initially when less than full pumping capacity is desired. During maximum flow demand operation, both pumps are delivering against full delivery pressure. During low flow demand operation only the pump without the check valve delivers against full pressure, the other pump being operated with essentially no pressure load. In a preferred embodiment the pump which contains the check valve is of considerably larger displacement than the other pump. The result is a pumping system with significantly reduced pump input power during periods of low flow demand.

REFERENCES:
patent: 1982711 (1934-12-01), Vickers
patent: 2247261 (1941-06-01), Towler et al.
patent: 2617361 (1952-11-01), Neal
patent: 2898737 (1959-08-01), Rockwell
patent: 3026929 (1962-03-01), Burns

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