| 摘要 |
The discharge water means ( 1 m) is provided within an area equal to or more than an area of the shroud extending to 20 degree points in both directions from a center that is a lowest portion of the ring portion ( 1 h). Due to this, if water drops adhered to the surface of the blade wheel ( 1 a) and the shroud ( 1 c) are collected at the lower side thereof due to gravity, it is possible to readily discharge the water. As a result, as it is possible to prevent the water drops from being stored in a clearance between the blade wheel ( 1 a) and the shroud ( 1 c), even when the temperature of the atmosphere is low in a winter season or the like, it is possible to prevent a freezing lock phenomenon from occurring.
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