| 摘要 |
In an impeller of an axial-flow blower driven by an outer rotor type motor, the impeller is formed in sections so that individual impeller sections 5F and 5R can easily be formed by molding with an axial coupling type die, and also which are arranged in series to construct the entire impeller, thereby realizing an impeller structure in which adjacent impeller blades overlap each other. The number of impeller blades of the front section impeller is more than that of the rear section impeller to reduce the noise generated during the rotation of the impeller.
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