Pumping system

Details Pumping system Pumping system

1979-02-22

1980-09-30

Jenkins, Robert W.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

318 48, F04B 4900

Patent

active

042252903

ABSTRACT:
An improved chromatographic pump control circuit for compensating for pulsation in pump flow over a wide range of flow-rates and pressures and for providing improved protection against pump pressure and motor torque fault conditions. The control circuit is coupled to a pump motor to provide motor speed-up during the repressurization portion of the pump cycle as a function of the set point pump flow rate. The circuit also includes a summing circuit for developing a repressurization signal based on the flow-rate and detected pressure. The signal is coupled to compensate for pulsation by controlling the duration of repressurization with respect to both pressure and the set point of the flow rate. The circuit is additionally coupled to sense pump pressure and motor torque to initiate alarm and pump shutdown during high and low pressure and motor over-torque fault conditions.

REFERENCES:
patent: 3855129 (1974-12-01), Abrahams
patent: 3985467 (1976-10-01), Lefferson
patent: 4024864 (1977-05-01), Davies
patent: 4108574 (1978-08-01), Bartley
patent: 4180375 (1979-12-01), Magnussen

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