| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe joint structure for a refrigerant capable of quickly achieving strong connection without implementing flare processing on an end portion, when a pipe is constituted of a copper pipe.SOLUTION: A pipe joint structure for a refrigerant includes a joint body 1 with a male screw and a cap nut 3 which is threaded to the male screw 2 of the joint body 1, and connects a copper pipe. The pipe joint structure further includes a sleeve 7 for compression deformation which is housed in an internal housing space 10 of the cap nut 3, includes a concave circumferential groove 9 on an outer circumferential surface 8 and receives an axial compression force from the joint body 1 and the cap nut 3 when threading the cap nut 3 and the male screw 2 of the joint body 1, in which a concave circumferential groove thin wall part 13 is plastically deformed radially inwards, and which is engaged from the side of an outer circumferential surface of the inserted copper pipe for locking. Further the joint body 1 has an insertion cylindrical portion 6 having axial uneven strip portion 52 for locking. |
