Apparatus for vacuum absorption with bypass passage reverse flow protection device
US5927952A · kind A · utility
Inventors
Key dates
| Filing date | Sep 6, 1996 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Sep 6, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04F5/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An apparatus for vacuum absorption comprising a tank for accumulating circulating water; a waterway for circulating the circulating water by a pump disposed at an absorption inlet side of the tank; an aspirator disposed on the waterway; a reverse flow prevention mechanism for preventing the circulating water from flowing reversely into a vacuum vessel connected to the aspirator during the stoppage of the pump and for introducing fresh air from the aspirator into the vacuum vessel. The outlet of the waterway is provided under the water surface of the circulating water in the tank, and the reverse flow prevention mechanism comprises a bypass tube leading from the upstream of the aspirator to the water surface in the tank, and a valve disposed in the bypass tube passing air only to the direction toward the aspirator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.