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Title:
BLOWER, AND OUTDOOR UNIT FOR AIR CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2002/053919
Kind Code:
A1
Abstract:
By suppressing generation and growth of a blade tip vortex at that portion of a blade outer circumference which is not surrounded by a bellmouth, the noise (i.e., the operating sound), as might otherwise be generated when the blade tip vortex and a fan guard collide, is reduced. The setting is made so that H¿1?/H¿0? = 0.40 to 0.65, where the height of the portion overlapping the outer circumference portion (P) of a blade (13) Out of the axial heights in the bellmouth (5) is designated by H¿1? and the axial height of the outer circumference portion (P) of the blade (13) is designated by H¿0?. With this setting, the growth of the leakage current (i.e., the blade tip vortex) from the positive pressure face to the negative pressure face of the blade (13) is suppressed at that portion of the outer circumference portion (P) of the blade (13) which is not surrounded by the bellmouth (5), while keeping the suction flow from the outer circumference portion (P) of the blade (13).

Inventors:
YAMAMOTO JIRO
ZHENG ZHIMING
OHNISHI TADASHI
Application Number:
PCT/JP2001/010599
Publication Date:
July 11, 2002
Filing Date:
December 05, 2001
Export Citation:
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Assignee:
DAIKIN IND LTD (JP)
International Classes:
F04D29/38; F04D29/54; (IPC1-7): F04D29/54
Foreign References:
JPH05133398A1993-05-28
JPH04353300A1992-12-08
JPH03267600A1991-11-28
Other References:
See also references of EP 1357296A4
Attorney, Agent or Firm:
Aoyama, Tamotsu (Shiromi 1-chome Chuo-ku Osaka-shi, Osaka, JP)
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