Fluid pumping process and system using a pump with a constant intake or delivery rate
US6244838A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 9, 1999 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Sep 9, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/326
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is a system and process for pumping fluids in lines, comprising using, on the lines, a pump with at least two alternating fluid pumping units. Each pumping unit (PU1, PU2) comprises a cylinder (2) and a piston (1) alternately displaceable in the cylinder under the action of a power source (M), under the control of a control device (PC), with, for both pistons, imposed displacement functions (f(t), g(t)) suitably phase-shifted in relation to one another so as to obtain a first operating mode corresponding to substantially constant delivery rate. This pump is operated in the same circuit according to the complementary second operating mode corresponding to a substantially constant intake rate by inversion of the direction of displacement of the pistons so as to apply to the pistons displacement functions (-f(t), -g(t)) symmetrical to those corresponding to the first operating mode. The selection of substantially constant delivery or intake rate is dependent upon the circuits to which the invention is applied. The process can be applied for example in the field of chromatography.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.