Variable discharge pump

Details Variable discharge pump Variable discharge pump

1990-04-25

1992-03-10

Bertsch, Richard A.

Pumps

Plural pumps with individual or relative control

Bypass control

417427, F04B 2304

Patent

active

050945971

ABSTRACT:
A variable discharge pump comprises a plurality of pumping units, each pumping unit including an outlet port discharging a particular volumetric discharge of working fluid, a plurality of outlet passages respectively communicating the outlet ports of each of the pumping units. Each of the outlet passages includes a supply passage provided for supplying the working fluid to a driven apparatus and a reflux passage provided for returning the working fluid to a working fluid reservoir, both being branched from the outlet passage. The variable discharge pump also includes an electromagnetic valve associated with the outlet passages for selectively switching a plurality of flow passages for the working fluid supplied from each of the outlet ports to either the supply passage or the reflux passage so as to provide a plurality of different volumetric discharges by combination of the particular volumetric discharges from each of the outlet ports and includes a plurality of check valves provided in each of the supply passages so as to prevent back-flow of the working fluid.

REFERENCES:
patent: 2563356 (1951-09-01), Moulden
patent: 2621607 (1947-12-01), Trapp

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