Piston pump for high performance liquid chromatography

Details Piston pump for high performance liquid chromatography Piston pump for high performance liquid chromatography

1989-01-30

1990-06-05

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 45, 417 63, 417415, F04B 4900

Patent

active

049309919

ABSTRACT:
A pump comprising at least a pump body having a chamber (110) communication with an inlet duct (130) and an outlet duct (140) via respective inlet and outlet valves (136, 146), a piston (120) moveable in sealed manner within said chamber, a cyclical actuator (400) of the rotary cam type for co-operating with said piston to cause it to slide, and a motor (500) for driving the cam in an unchanging predetermined direction while injecting volumes greater than the cylinder capacity of the pump, wherein the pump includes control means (404, 220, 600) adapted, on detecting that a required volume has been injected, to determine the position occupied by the rotary cam and to return the piston to the initial position of its delivery stroke prior to injecting a following volume by reversing the direction of rotation of the motor during reinitialization of the piston whenever the rotary cam is positioned on its delivery slope on such detection, and in contrast reinitializing the piston without reversing the direction of rotation whenever the rotary cam is positioned on its suction slope on such detection.

REFERENCES:
patent: Re31586 (1984-05-01), Magnussen, Jr.
patent: 4131393 (1978-12-01), Magnussen
patent: 4326837 (1982-05-01), Gilson et al.
patent: 4681513 (1987-07-01), Saito et al.

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