Axial flow fan
US6287078A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1999 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Dec 30, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S416/05
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An axial flow fan is disclosed. The axial flow fan comprises a hub, a plurality of blades extending radially outwardly from the hub, and an outer band surrounding peripheral ends of the blades. The median sweep angle of each blade increases gradually from 0.degree. along the outward radial direction. The leading sweep angle of each blade starts from an angle of less than 0.degree., increases gradually and terminates at an angle of more than 40.degree.. The trailing sweep angle of each blade increases along the outward radial direction after it decreases from an angle of more than 0.degree. along the outward radial direction. The chord length of each blade gradually increases along the outward radial direction. The pitch angle of each blade gradually decreases along the outward radial direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.