Centrifugal fan
US9394920B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2013 |
| Grant date | Jul 19, 2016 |
| Priority date | — |
| Expiry date | Oct 15, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A centrifugal fan includes a casing having an upper casing and a lower casing, and an impeller disposed between the upper and lower casing. The impeller includes an upper shroud having an upper portion formed with an inlet, a lower shroud, and a plurality of blades arranged along a circumference direction between the upper shroud and the lower shroud. The lower shroud is provided only on a portion at a side of a rotation axis of the impeller such that at least an outer circumferential side portion of each blade faces an upper surface of the lower casing. A surface of the lower casing, which faces the impeller, configures a portion of a wall surface which guides the fluid introduced from the inlet. Each blade has a shape which becomes thinner as increasing a distance from the upper shroud in a direction parallel to the rotation axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.