Radial fan wheel for transporting cooling air for an electric machine
US7121798B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 2003 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | Oct 8, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/666
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a radial fan wheel for supplying cooling air for an electrical machine, with a number of fan blades (16) attached along the circumference of the fan wheel (10) that have arc-shaped blade ends (18), which, at their radially inner edge, enclose a first angle (β1) with a tangent (20) to the inner circumference (20) of the fan wheel (10) and at their radially outer edge, enclose a second angle (β2) with a tangent (22) to the outer circumference (24) of the fan wheel (10), the invention proposes that the second angle (β2) be selected to be 75% or more greater than the first angle (β1) in order to minimize the turbulence noise in the vicinity of the fan blades (16) during operation of the fan wheel (10).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.