Pressure gradient control system
US5356335A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1992 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Jun 29, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D16/2073
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pressure gradient control system includes a ventilated area divided into a plurality of intercommunicating zones, a zone-to-zone pressure gradient detecting device for detecting pressure gradients between adjacent zones, a control unit for adjusting quantities of air supply or exhaust to/from the zones based on detection information received from the zone-to-zone pressure gradient detecting device to establish a predetermined pressure gradient between adjacent zones, and an interior-ambient pressure gradient detecting device for detecting pressure gradients between an ambient area and those of the zones communicating with the ambient area. The control unit is operable, in response to detection information received from the zone-to-zone pressure gradient detecting device and the interior-ambient pressure gradient detecting device, to adjust quantities of air supply or exhaust to/from the zones, thereby to establish the predetermined pressure gradient between adjacent zones and between the ambient area and those of the zones communicating with the ambient area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.