Engine enclosure air inlet/discharge sound attenuator
US5625172A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1995 |
| Grant date | Apr 29, 1997 |
| Priority date | — |
| Expiry date | Apr 18, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F2013/245
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A sound attenuator for an enclosure, in particular, an apparatus for attenuating the sound at the openings which allow air to enter and exit an internal combustion engine enclosure with minimal pressure loss. The attenuator comprises a combination of passive sound absorptive louvers place in series with a plurality of reactive Helmholtz resonator units mounted in parallel rows in the open area between each pair of louver. The Helmholtz resonators being tuned to attenuate a single or multiple low frequency noise spikes. The attenuator providing improved sound attenuation and requiring substantially less volume than a typically used absduct type silencer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.