Counter-rotating axial flow fan
US8690528B2 · kind B2 · utility
3Cited by
1References
4Claims
0Family size
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Key dates
| Filing date | Dec 14, 2010 |
| Grant date | Apr 8, 2014 |
| Priority date | — |
| Expiry date | Oct 6, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/663
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A counter-rotating axial flow fan in which the shape of stationary blades of a middle stationary portion is optimized to reduce noise is provided. Defining the maximum axial chord length of front blades as Lf, the maximum axial chord length of rear blades as Lr, and the maximum axial chord length of stationary blades as Lm, a relationship of Lm/(Lf+Lr)<0.14 is satisfied. Defining the maximum dimension between the blade chord for lower surfaces of the stationary blades and the lower surfaces as K1, the maximum axial chord length Lm of the stationary blades satisfies a relationship of Lm/K1>5.8.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.