Impeller and cooling fan incorporating the same
US8092185B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 23, 2008 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Nov 10, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/667
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A cooling fan (10) includes a bottom plate (12) a top cover (14) covering the bottom plate, a sidewall (13) disposed between the bottom plate and the top cover, and an impeller (16) enclosed in a space formed between the bottom plate, the top cover and the sidewall. The impeller includes a hub (162), and a plurality of blades (164) radially and outwardly extending from the hub. Each of the blades includes a windward surface (164a) and a leeward surface (164b) opposite to the windward surface. The leeward surface of each blade defines three indents (171, 172, 173) therein. Two protrusions (174) are formed between adjacent indents. The uneven leeward surface is provided for lowering the noise level generated by the cooling fan during an operation thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.