Title:
MULTI-BLADE FAN
Document Type and Number:
WIPO Patent Application WO/2015/098700
Kind Code:
A1
Abstract:
Provided is a multi-blade fan in which quietness is improved by suppressing wind noise and low-frequency broadband noise, as well as the protuberance of specific discrete-frequency noise. A cross-flow fan (10) has a support plate (50) which rotates about a rotating shaft and to which a plurality of blades (101-135) are fixed. The plurality of blades (101-135) are fixed to the support plate (50) such that the pitch angles (Pt1-Pt35) between blades, said angles using the rotating shaft as a basis, form a prescribed sequence. The plurality of blades (101-135) are arranged such that, of the periodic function amplitude values for each degree when the prescribed sequence is expanded into a periodic Fourier series, the maximum amplitude value is less than 200% of the second largest amplitude value.
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| JPH1113689 | BEARING STRUCTURE FOR CROSS FLOW FAN |
Inventors:
UDA MASAFUMI
Application Number:
PCT/JP2014/083574
Publication Date:
July 02, 2015
Filing Date:
December 18, 2014
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
International Classes:
F04D17/04; F04D29/30
Foreign References:
| JP2009162086A | 2009-07-23 | |||
| JP2001214705A | 2001-08-10 | |||
| JP2000045992A | 2000-02-15 | |||
| JP2001050556A | 2001-02-23 | |||
| JP2011064360A | 2011-03-31 | |||
| JP3484854B2 | 2004-01-06 |
Other References:
See also references of EP 3088742A4
Attorney, Agent or Firm:
Shinjyu Global IP (JP)
fresh green -- a global IP patent business corporation (JP)
fresh green -- a global IP patent business corporation (JP)
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