| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently enhance the total pressure of an air blower while reducing noise in a centrifugal air blower having plural blowoff ports. SOLUTION: Winding anglesθ1 andθ2 of air passages 124 and 125 are set not less than 90 deg., and the ratio (G/D) of a gap dimension G to a fan diameter D is set not less than 0.1. Thus, an air flow is stabilized, and turbulence is hardly caused in the flow. Thus, the total pressure of the air blower 120 can be sufficiently enhanced while reducing the noise, and an NZ sound can be sufficiently reduced.
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