| 摘要 |
PROBLEM TO BE SOLVED: To improve shape precision of an impeller and to facilitate manufacture. SOLUTION: The impeller 20 of a centrifugal blower is formed that a plurality of blades 41 are erected at intervals of a given distance in a peripheral direction at a disc-form main disc 40. Each of the blades 41 comprises a main blade 42 arranged radially externally; and a front vane 43 radially internally arranged with a given gap S relative to the main vane. Especially, a vane member 45 formed of a metallic material having rigidity higher than that of a resin material is arranged in the radially internal position of the main vane 42 molded from a resin material and coupled with the main vane 42 with a given gap S between the main vane 42 and the vane member 45, and the front vane 43 is constituted out of the vane member 45.
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