Two-stage pump assembly
US4681513A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1986 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Jan 28, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/326
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An accurately controllable two-stage pump assembly comprising two plunger pumps connected in series. The suction port of the outlet pump A is connected to the discharge port of the inlet pump B, so that the discharge port of the outlet pump A and the suction port of the inlet pump B act as the discharge port and the suction port, respectively, of the whole pump assembly. While the inlet pump B is delivering fluid from the whole pump assembly, the outlet pump A completes the filling stroke of the whole pump assembly and fully increases the pressure inside the chamber of the outlet pump A. While the inlet pump B is filling, the outlet pump A is in the stage of displacement stroke and delivers fluid from the whole pump assembly. The plungers of the pumps are moved via cams by stepper motors which swing or rotate back and forth within a certain angular range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.