| 摘要 |
PROBLEM TO BE SOLVED: To provide a double pipe and its manufacturing method capable of securely and easily joining an outer pipe and an inner pipe. SOLUTION: In the double pipe equipped with the outer pipe 161 and the inner pipe 162, the inner pipe 162 is inserted into the outer pipe 161 and longitudinal ends 161a of the outer pipe 161 are brazed to an outer circumferential face of the inner pipe 162. A caulked part 161b with the diameter shortened and caulked to the inner pipe 162 is formed on the longitudinal ends 161a of the outer pipe 161. Further, a tapered part 161c which becomes thinner toward its tip end is formed on the inner peripheral face of the longitudinal ends 161a. COPYRIGHT: (C)2007,JPO&INPIT |
