Device for liquid pumping
US4892294A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 9, 1989 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Jan 9, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S266/901
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A device for liquid pumping, including a main chamber and a pump chamber for receiving a subportion of the liquid to be pumped from the main chamber and which is provided with means for cyclic variation of the pressure in the pump chamber between a pressure greater than a pressure less than the pressure in the main chamber. The pump chamber is connected to the main chamber by at least one input opening and at least one output opening. The input opening has a substantially lower flow resistance in the direction into the pump chamber than in the opposite direction and the output opening has a substantially lower flow resistance in the direction out of the pump chamber than in the opposite direction. Thereby, when the pump chamber is at a pressure lower than the pressure in the main chamber, a larger liquid quantity is sucked into the pump chamber through the input opening and when the pump chamber is at a pressure lower than the pressure in the main chamber a larger liquid quantity is forced out through the output opening than through the input opening, so that a net liquid quantity is sucked in through the input opening and forced out through the output opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.