Method of sound attenuation in centrifugal blowers
US6575696B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2001 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Sep 11, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/665
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A centrifugal blower housing that includes sound attenuating features to decrease the noise generated by the pressure fluctuations due to blade pass. The blower housing includes at least one sound attenuating cavity positioned along the exhaust section integrally formed as part of the blower housing. The sound cavity creates a sound dampening zone near the outlet of the blower housing to attenuate the sound generated by the rotating impeller. The blower housing further includes an angled cut off portion positioned near the intersection of the exhaust section and the scroll section of the blower housing. The angled cut off portion creates an uneven surface that disrupts the pressure fluctuation created as the impeller blades pass over the cut off edge surface. The angled cut off portion extends into the interior of the exhaust section and defines an irregular surface along at least a portion of the exhaust section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.