| 摘要 |
PURPOSE:To reduce the leak loss by forming a recessed part and projection parts onto the inner surface of a front casing and a side plate so that a flow passage formed by the inner surface of the front casing and the side plate is bent in plural times. CONSTITUTION:A recessed part 12 is formed between the projection parts 10 and 11 formed inside a front casing 1. The projection part 13 formed on a side plate 6 is fitted into the recessed part 12 on the front casing 1. Therefore, a flow passage is bent in plural times by the projection parts 10, 11, and 13 and the recessed part 12, and the water resistance is increased, and the leak loss can be reduced.
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