| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems of a conventional heat exchanger with serpentine flow paths such that there is necessity to flatten a curved pipe section, pressing a heat conductive pipe 4 from four directions, when flattening the curved pipe section, and a flattening jig has complicated structure, and the manhour in processing increases, and that a thick heat conductive pipe needs to be used in order to avoid the deformation at flattening processing. SOLUTION: It is possible to flatten a curved pipe section, pressing it from two directions, by limiting the scope of flattening the curved pipe section, and it is possible to simplify the structure of a jig, and the manhour can be reduced, too. Moreover, since the flatness can be reduced by tapering the flat part, a thin heat conductive pipe can be used.
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