Vacuum producing device
US7140389B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2001 |
| Grant date | Nov 28, 2006 |
| Priority date | — |
| Expiry date | May 3, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86083
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vacuum producing device (1) possessing a principal suction nozzle unit (2) with a shut off valve (27) on the upstream side thereof and an additional suction nozzle unit (3) connected in parallel to the principal suction nozzle unit (2). While the supply of pressure medium for the principal suction nozzle unit (2) is controlled in a manner dependent on the negative pressure produced by controlling the shut off valve (27), the additional suction nozzle unit (3) remains (3) constantly in operation. This means that a complete build up of vacuum may be ensured in conjunction with a complete switching off of the principal suction nozzle unit (2) together with a resulting air economizing effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.