| 摘要 |
A shroud of the present invention includes a body portion 5 B, a mount 7 positioned at a center of the body portion 5 B and supporting rotary vane wheel driving means 6 , and multiple support beams 10 radially extending from the mount 7 and joining the mount 7 and the body portion 5 B, where each of the support beams 10 becomes thicker from an upstream side of a flow direction of air toward a downstream side thereof, and an edge portion 10 ti of each of the support beams 10 on the downstream side of the flow direction of the air discharged by the rotary vane wheel 8 is oriented in a direction parallel to a rotation axis of the rotary vane wheel 8 , and the edge portion on the upstream side is oriented in a direction opposite to a rotation direction of the rotary vane wheel 8.
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