Pumps – Condition responsive control of pump drive motor – Responsive to change in rate of pump fluid flow
Patent
1988-09-19
1989-11-28
Croyle, Carlton P.
Pumps
Condition responsive control of pump drive motor
Responsive to change in rate of pump fluid flow
417 44, 417212, 417265, 210101, F04B 4106
Patent
active
048834092
ABSTRACT:
A pumping apparatus for delivering liquid at a high pressure, in particular for use in liquid chromatography, comprises two pistons (10, 20) which reciprocate in pump chambers (7,18), respectively. The output of the first pump chamber (7) is connected via a valve (13) to the input of the second pump chamber (18). The pistons are driven by linear drives (30,31), e.g., ball-screw spindles. The stroke volume displaced by the piston (10) is freely adjustable by corresponding control of the angle by which the shaft of the drive motor (36) is rotated during a stroke cycle. The control circuitry is operative to reduce the stroke volume when the flow rate which can be selected by user at the user interface (42) is reduced, thus leading to reduced pulsations in the outflow of the pumping apparatus. The pumping apparatus can also be used for generating solvent gradients when a mixing valve (2) connected to different solvent containers (A,B,C,D) is coupled to the input of the pumping apparatus (FIG. 1).
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Strohmeier Fred
Witt Klaus
Croyle Carlton P.
Scheuermann D.
Schuette Richard F.
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