Centrifugal blower and portable power working machine
US6511286B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 2001 |
| Grant date | Jan 28, 2003 |
| Priority date | — |
| Expiry date | Feb 26, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/703
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A centrifugal blower comprises an impeller; and a casing, having an intake port disposed at a region opposing the air inlet portion of impeller, for accommodating the impeller. The casing is provided with a port cover constituted by rod-shaped members which are arranged in a net structure, in order to cover the intake port of casing. A trailing edge portion of the rod-shaped members is formed with a slanted surface. Due to this slanted surface, the flow of air passing through the port cover so as to flow into the air inlet portion is smoothly deflected away from the axis of rotation of impeller. As a consequence, swirls are restrained from occurring, whereby a sound-insulating effect is exhibited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.