DOUBLE PIPE STRUCTURE HOLLOW MEMBER, IT MANUFACTURING METHOD, AND FLUID TREATING SYSTEM USING DOUBLE PIPE STRUCTURE HOLLOW MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a fluid treating system, using a double pipe structure hollow member, reduced in weight by thinning a plate thickness and holding strength, suppressing the generation of radiation noise during introduction of treated fluid and the occurrence of a thermal expansion difference due to the heat of fluid flowing through an internal part, and capable of being easily molded through the less number of processes. SOLUTION: A catalyst container 1 for a catalyst converter is of double pipe structure formed by effecting superposition such that the outer peripheral surface of an inner pipe 1 and the inner peripheral surface of an outer pipe 12 make contact with each other, and comprises a catalyst installation part 1a; a taper-form cone part 1b formed such that gradual reduction in a diameter from the catalyst installation part 1a is effected; and a straight-form connection part 1c extending from the minimum size of the cone part 1b toward an end part and connected to connection pipes situated upper stream and downstream of the catalyst converter. A hole 13 is formed in the cone part 1b of the inner pipe 11. A catalyst installation part 1a is formed such that a catalyst 2 is situated through the medium of the mat 3 and the catalyst 2 is held in a non-movable state by slightly reducing the sizes of two ends.