Power conservation means for variable displacement pump fluid su

Details Power conservation means for variable displacement pump fluid su Power conservation means for variable displacement pump fluid su

1977-05-09

1978-05-16

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60452, 417212, F16H 3946

Patent

active

040891704

ABSTRACT:
Pressurized fluid is supplied to fluid-driven mechanisms by a variable displacement supply pump through a check valve and a flow control valve. A compensator receiving a pressure feedback signal from the control valve side of the check valve increases pump displacement in response to a pressure signal drop and decreases pump displacement in response to a rise in the signal pressure to compensate for variations in demand. Part of the supply pump output is used to drive a small fluid motor which turns a small pressure signal-amplifying pump connected in parallel with the check valve. The check valve opens to transmit the variable displacement pump output to the driven mechanisms when the control valve is opened. When the flow control valve is closed the check valve also closes enabling the fluid motor and pressure signal-amplifying pump to maintain the feedback signal to the compensator at a high pressure while the actual output pressure of the supply pump drops owing to the reduced displacement caused by the high feedback signal. The resulting internal pressure reduction in the supply pump during standby periods greatly reduces leakage which translates into power and fuel or energy savings.

REFERENCES:
patent: 3664127 (1972-05-01), Praddaude
patent: 3695783 (1972-10-01), Soyland et al.
patent: 3864063 (1975-02-01), Martin
patent: 3889340 (1975-06-01), Dixon

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