Piston pumping system delivering fluids with a substantially con

Details Piston pumping system delivering fluids with a substantially con Piston pumping system delivering fluids with a substantially con

1995-10-26

1998-05-26

Thorpe, Timothy

Pumps

Successive stages

Stages driven by relatively movable motor working members

417248, F04B 2500

Patent

active

057555613

ABSTRACT:
A pumping system in accordance with the invention comprises n (n.gtoreq.1) piston or diaphragm primary pumping modules (P1 to Pn) including each at least one pumping unit, connected by means of unidirectional valves (V11-V1n) respectively to n tanks (R1-Rn) containing fluids, a collecting head (CH) receiving the fluids delivered by the various primary modules, and a secondary piston pumping unit (S) for discharging the mixture of fluids collected in this head with a substantially constant flow rate. The pistons are shifted alternately for example by the translation motion of endless screws (9) driven by motors (12). A control set (17-20) associated with position detectors (AC1-ACn) and pressure detectors (C1 to Cn, Cs) proportion the fluids injected and adjust the phases, the piston strokes and their velocities in order to obtain a substantially constant discharge rate. Each primary module can also comprise a second pumping module also allowing a constant rate to be obtained during the suction phase. The invention has application to liquid chromatography.

REFERENCES:
patent: 3704080 (1972-11-01), Cross
patent: 4311586 (1982-01-01), Baldwin et al.
patent: 4312626 (1982-01-01), Juran
patent: 4883409 (1989-11-01), Strohmeier et al.
patent: 5020974 (1991-06-01), Searle
patent: 5253981 (1993-10-01), Yang et al.
patent: 5330327 (1994-07-01), Anderson
patent: 5538403 (1996-07-01), Black

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