Centrifugal blower and power working machine
US6575695B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 2000 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Feb 13, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B7/1427
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A centrifugal blower capable of reducing noise. The centrifugal blower comprises an impeller having a hub plate and a set of blades disposed on at least one surface of the hub plate so as to surround an axis of rotation; and a casing surrounding the impeller and having a volute portion disposed at an outer peripheral portion thereof. The portion of casing facing the set of blades is formed with a plurality of through holes, whereas a sound absorbing material is attached thereto so as to cover the through holes. The noise caused by a compression wave of air occurring between the blades of impeller and the inner face of casing is efficiently absorbed by a sound absorbing material disposed adjacent the blades.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.