| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently perform the radiation of a driving motor with a low noise without deteriorating the blowing efficiency by boring a plurality of motor radiation holes on a protruding hub for fixing the rotating shaft of the driving motor, and providing ribs or protruding parts on the parts closer to the impeller rotating directional side of the radiation holes. SOLUTION: An impeller 1 for centrifugal blower comprises a plurality of blades 1c arranged around a hub 1a, and an annular shroud 1d for integrally connecting the blades 1c. When the impeller 1 is rotated in direction A by a driving motor having a rotating shaft fixed to the center 0 of the hub 1a, air is sucked through a suction port 1f and radially blown out. Motor radiation holes 1e... are bored in the hub 1a, and a rib 13 is provided in the part closer to the impeller rotating directional side of each radiation hole 1e. According to this, a circulating flow from the reverse side of the hub 1a to a low pressure impeller internal air passage is formed, the disturbance of the circulating flow is suppressed by the presence of the rib 13 to perform the radiation of the driving motor with a low noise.
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