| 摘要 |
There is provided a centrifugal impeller that includes a boss portion, a plurality of first centrifugal blades, a plurality of second centrifugal blades, and a coupling portion. The boss portion is capable of rotating. The plurality of first centrifugal blades are provided to the boss portion such that the plurality of first centrifugal blades extend from the boss portion. The plurality of second centrifugal blades are provided around the boss portion such that the plurality of second centrifugal blades are spaced apart from the boss portion. The coupling portion couples the plurality of first centrifugal blades and the plurality of second centrifugal blades.
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