| 摘要 |
A pipe-connecting device is provided which is of the type using an inner ring, and which, while maintaining a satisfactory seal performance, is improved so as to be repeatedly used times larger than those in the conventional art, by revising the structure. A pipe-connecting device includes: an inner ring 3 having an outer circumferential portion 3G having, at a tip end, a tip-contracted outer-circumferential flared surface 3a that flares a tube end portion 4C; a pipe joint body 1 that has a tubular screwing portion 1A having an external thread 7; and a union nut 2 having an internal thread 13. The inner ring 3 flares the tube end portion 4C, and is inserted into the tubular screwing portion 1A. The tip-contracted outer-circumferential flared surface 3a is clamped and pressed through the tube 4 by the union nut 2 which is screw-advanced by screwing with the tubular screwing portion 1A. A tube pressing portion 12b which is in the union nut 2, and which presses the tube 4 against the tip-contracted outer-circumferential flared surface 3a is formed into an inclined inner circumferential surface which is inclined in the same direction as the outer-circumferential flared surface 3a with respect to the axis Y of the tubular screwing portion 1A. |
