Title:
FAN BLADE
Document Type and Number:
Japanese Patent JP2004211675
Kind Code:
A
Abstract:
To greatly damp roaring or draining noises of a fan blade of a heat radiation fan device for a home electric fan, an industrial blower or electric equipment or a propeller of an oceanographic research vessel and a submarine.
The best angle of advance or sweepback of the fan blade or the propeller near its end in the rotating direction is set to be 45° to a normal line, which is a nonconventional great angle of advance or sweepback. The angle of advance or sweepback of the blade at its front and rear edges is gradually changed in a range of 45-90° to greatly damp the roaring or draining noises.
Inventors:
MATSUMOTO OSAMI
Application Number:
JP2003034386A
Publication Date:
July 29, 2004
Filing Date:
January 07, 2003
Export Citation:
Assignee:
MATSUMOTO OSAMI
International Classes:
B63H1/26; F04D29/38; (IPC1-7): F04D29/38; B63H1/26
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