| 摘要 |
PROBLEM TO BE SOLVED: To reduce the thermal stress generated in the sealing structure section between a casing and a pipeline forming the flowing route of high-temperature air or exhaust gas. SOLUTION: The bellows tying-in structure of the casing passing section of a pipeline 5 coated with an outer heat insulating material 2 is constituted in such a way that the pipeline 5 is connected to the casing 3 lined with an inner heat insulating material 1 through metallic bellows 4 when the pipeline 5 is tied in the casing 3, but the metallic expansion structure using the bellows 4 is constituted in such a way that a single pipe 6 which absorbs the displacement of the pipeline 5 caused by thermal expansion, etc., is attached to the casing 3 in a tapered state at an attaching angleθ. When the angleθis gradually increased and approaches 300 deg. (θ=30 deg.), the thermal stress approaches the minimum value. In order to minimize the generated stress, it is preferable to set the setting angle at 45 deg. (θ=45 deg.), because the stress becomes the lowest at 45 deg..
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