| 摘要 |
In a centrifugal fan, an impeller portion, fitted to a rotor portion which rotates with respect to a stator portion, rotates around a central axis J 1 . The impeller portion is housed in a housing comprised of a housing body and a cover portion. By rotation of the impeller portion, air is taken in from an inlet and delivered from an outlet. In the centrifugal fan, an annular protrusion, protruding toward a connection plate on the lower side of blades, is formed in the base portion in order to make a space between the impeller portion and the base portion small. A depression for partially expanding a space between the connection plate and the base portion is provided in the annular protrusion.
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