Pumping apparatus and pump control apparatus and method

Details Pumping apparatus and pump control apparatus and method Pumping apparatus and pump control apparatus and method

1989-11-28

1991-02-05

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

By controlling drive motor motive fluid

417 18, 417 53, F04B 4900

Patent

active

049900587

ABSTRACT:
A pumping apparatus comprises a fluid end cylinder carrying a double-acting piston which is reciprocated by a hydraulic servo actuator to provide an expanded flow range ability for metering fluids. The hydraulic servo actuator comprises: a hydraulic cylinder carrying a drive piston connected to the fluid end piston; a servo valve; a position transducer; and a microprocessor-based controller. The controller is programmed to accommodate accleration and deceleration of the extend and retract phases of a pump cycle to maintain constant average flow rate out of the fluid end. A control apparatus for controlling a pump and a related method are also disclosed.

REFERENCES:
patent: 2977765 (1961-04-01), Fillmore
patent: 3966358 (1976-06-01), Heimes et al.
patent: 4705462 (1987-11-01), Balembois
"Hydraulics & Pneumatics", May 1986, pp. 57 & 58.

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