Reduced noise trim air system
US5135161A · kind A · utility
10Cited by
8References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1990 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Dec 10, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2663
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Audio noise created by trim valves (66a-72a) in a warm air trim system (24) of an air cycle air conditioning system (10) is reduced by controlling the pressure drop across the trim valves as a function of the position of the valves (66a-72a). A proportional valve (112) typically under the control of an electronic controller (116) is controlled to set the pressure drop across the trim valves. Reducing the pressure drop across the trim valves, reduces the noise created by air flowing through the trim valves thereby reducing noise in an aircraft cabin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.