CENTRIFUGAL BLOWER, METHOD OF MANUFACTURING THE SAME, AND AIR-CONDITIONER PROVIDED WITH THE SAME

WIPO Patent Application WO/1999/017027

A1

A centrifugal blower comprising a vane wheel (10) having a hub (11), a shroud (12) disposed so as to be spaced at a predetermined distance from and opposed to the hub, and a plurality of vanes (13) extending between an outer circumferential portion of the hub and that of the shroud and arranged substantially radially around the axis of the hub, wherein a rear edge (13b) of each of the vanes is formed in a saw-toothed shape (20) having a lengthwise extending wavy edge in which alternate projections and recesses extend in the widthwise direction of the vane. The rear edge (13b) of this structure has alternate large-length sections and small-length sections, so that the confluence at the rear edge of air flowing on the side of a pressure surface of the vane and air flowing on the side of a vacuum surface thereof is effected gradually along the whole length of the rear edge, whereby a pressure gradient and a speed loss of air flow due to the confluence at the rear edge become so small as to minimize the turbulence of the air flow at the rear edge, and reduce an air supply noise.

SANAGI TSUNEHISA
SAKAMOTO HIDEAKI

PCT/JP1998/004331

April 08, 1999

September 28, 1998

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DAIKIN IND LTD (JP)

F04D29/28; F04D29/30; F04D29/66; F24F1/00; F24F13/32; (IPC1-7): F04D29/30

JPH08189497A	1996-07-23
JPS62185893U	1987-11-26
JPS62185892U	1987-11-26
JPH05312191A	1993-11-22
JPH0674195A	1994-03-15
JPH0176596U	1989-05-24

See also references of EP 0942175A4
None

Aoyama, Tamotsu (Shiromi 1-chome Chuo-ku, Osaka-shi Osaka, JP)

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