Axial flow fan
US6491499B1 · kind B1 · utility
7Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2000 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Sep 27, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/384
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An axial flow fan comprises a hub rotatable on a central axis and a plurality of radial blades extending from the hub, each having a root portion adjacent the hub and each having tip portion space radially from the hub and surrounded by an annular band. The root portions are substantially equally spaced circumferentially at their junctions with the hub and at least some of the tip potions are substantially unevenly space circumferentially. The latter is due to the condition that blade centerlines are pivoted through unequal angles about points along the junctions between the hub and the blade root portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.