| 摘要 |
PROBLEM TO BE SOLVED: To easily realize the low-cost impeller structure of a synthetic resin molding that has adjacent vanes overlapped with each other, as seen from the axial direction, and to reduce the noise generated, when the impellers are rotated. SOLUTION: In the impeller for the axial blower to be driven by an outer rotor type motor, the impeller 5 is divided so that each divided impeller 5F and 5R can be simply molded by an axial directional two-piece type mold. Each divided impeller 5F and 5R are arranged in series to constitute the whole impeller, and the adjacent impellers are overlapped with each other. The number of impeller of the front side divided impeller 5F is set larger than the number of impeller of the rear side divided impeller 5R, to reduce the noise to be generated when the impellers are rotated.
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