Multiple piston pump with a constant discharge capacity

Details Multiple piston pump with a constant discharge capacity Multiple piston pump with a constant discharge capacity

1981-09-17

1985-01-08

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417273, 210101, F04B 4906, F04B 4908

Patent

active

044925247

ABSTRACT:
A multiple piston pump with a constant discharge capacity for liquid chromatographs comprises at least three piston-cylinder units (1,2,3), whereof the pistons (7) are driven through a non-linear drive by a motor (23) with a mutual phase displacement of 360.degree.
, when n represents the number of piston-cylinder units. A regulating system varies the speed of the motor (23) during each period or cycle of the piston movement in such a manner as to compensate for the non-linear drive so that the pressure of the liquid conveyed during each period or cycle remains at least approximately constant. The motor (23) can be constructed as a stepping motor, which is supplied with current pulses whereof the frequency determines the speed of the motor.

REFERENCES:
patent: 3847507 (1974-11-01), Sakiyama
patent: 3882861 (1975-05-01), Kettering
patent: 4028018 (1977-06-01), Audsley
patent: 4173437 (1979-11-01), Leka
patent: 4180375 (1979-12-01), Magnusson
patent: 4233156 (1980-11-01), Tsukada
patent: 4255088 (1981-03-01), Newton
patent: 4299541 (1981-11-01), Ohara
patent: 4321014 (1982-03-01), Eburn
patent: 4326837 (1982-04-01), Gilson
patent: 4352636 (1982-10-01), Patterson
patent: 4359312 (1982-11-01), Funke

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