| 摘要 |
PROBLEM TO BE SOLVED: To provide a bellows structure which can suppress bending amount and flapping of the bellows, and satisfactorily improve a life of the bellows. SOLUTION: A standing flange 3 is arranged so as to be connected to a bellows side tie-in flange 2 fixed to a duct side tie-in flange 1 of each end of the bellows 5. The bellows 5 is fixed to the standing flange 3, while a pressing fitting 11 abutting against the rear surface of the bellows 5 is arranged on one side. Projecting supports 10 connected to the standing flange 3 are arranged on the other side. The pressing fitting 11 and the supports 10 support the bellows 5 from the inside, for suppressing the movement of the bellows 5 to the inside. It is thus possible to prevent flapping of the bellows 5 with remarkable amplitude so as to bent the bellows 5 to the rear side, which may be caused by pressure fluctuation inside the duct, and prevent fatigue damage of the bellows 5 due to repetitive bending.
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