Low frequency noise and turbulence reducer
US4726563A · kind A · utility
5Cited by
7References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Apr 28, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F2013/1466
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
Low frequency noise and turbulence are reduced in a damper structure by providing a perforate screen extension onto the damper blade so as to extend across the flow path when the damper is open. Additionally, a perforate screen is located immediately downstream of the damper and spaced from the wall so as to define a chamber therewith as well as defining a boundary of the flow path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.