| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide [piping structure and tightening method] of different kind of metal sufficiently ensuring a seal property of piping, simplifying a construction method, and eliminating increasing of a cost of manufacture. SOLUTION: In a peripheral surface of an end part 11 of a refrigerant pipe 10, a sealing recessed groove 13 and a caulking recessed groove 14 are formed, in the sealing recessed groove 13, a seal ring member 12 is mounted, the end part 11 of the refrigerant pipe 10 is inserted in a straight-shaped end part 16 of a metal-made flexible tube 15k, this end part 16 is caulked relating to the caulking recessed groove 14 of the refrigerant pipe 10, in a periphery of the end part 16 of the metal-made flexible tube 15, a ring-shaped metal fixture 17 is fitted. Both ends 18 of this ring-shaped metal fixture 17, while interposing between thereof the end part 16 of the metal-made flexible tube 15 relating to the re-tightening recessed groove 14 of the refrigerant pipe 10, is caulked.</p> |
