Cooling fan with reduced noise for variable speed machinery
US5021696A · kind A · utility
34Cited by
12References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1989 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Sep 14, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K9/06
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A centrifugal fan for ventilated rotating machinery is provided having tapered fan blades to reduce sound pressure levels generated by fan operation over a wide speed range. The tapering of the fan blades keeps the cross-sectional area of each flow channel substantially constant as the air flows radially through the fan, resulting in a less turbulent flow. Each fan blade may include a height profile having a tapered segment in which blade height decreases in proportion to increasing radial distance from the central axis of the fan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.