JPS61179481U

JPS61179481U -

Info

Publication number: JPS61179481U
Application number: JP6388685U
Authority: JP
Priority date: 1985-04-26
Filing date: 1985-04-26
Publication date: 1986-11-08

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係る管継手を示す
縦断面図、第２図は上記管継手のシートリングの
縦断面図、第３，４図は夫々締付ナツトの一部断
面側面図及び正面図、第５図は管継手の耐圧・耐
熱試験にかかるヒートサイクルを示す説明図であ
る。１…継手管、１ａ…継手部、２…締付ナツト、
３…接続管、４…シートリング、６…テーパー周
面、９…テーパー部、１６…先端部、１７…膨出
部。 Fig. 1 is a longitudinal cross-sectional view showing a pipe joint according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the seat ring of the pipe joint, and Figs. 3 and 4 are partially cross-sectional side views of the tightening nut. The figure, front view, and FIG. 5 are explanatory diagrams showing the heat cycle involved in the pressure and heat resistance test of the pipe joint. 1...Joint pipe, 1a...Joint part, 2...Tightening nut,
3...Connection pipe, 4...Seat ring, 6...Tapered peripheral surface, 9...Tapered part, 16...Tip part, 17...Bulging part.

Claims

[Scope of Claim for Utility Model Registration] (1) Fit the connecting pipe 3 into the joint part 1a of the joint pipe 1, screw the tightening nut 2 onto the outer circumferential thread of the joint part 1a of the joint pipe 1, and tighten it. In the fluororesin pipe joint that irremovably connects and holds the connecting pipe 3 to the joint pipe 1, the connecting pipe 3 has a tapered part 9 that widens outward in the radial direction at its connecting end. The above-mentioned joint pipe 1 is provided with a thick wall portion 5 protruding inward on its inner circumferential surface, and a connecting pipe 3 is attached to the end of the thick wall portion 5.
is provided with a tapered peripheral surface 6 that comes into close contact with the inner peripheral surface of the tapered part 9, and further includes an outer peripheral surface of the connecting pipe 3 and the joint pipe 1.
An annular seat ring 4 is provided between the inner peripheral surface of the joint portion 1a of the joint pipe 1 and the outer peripheral surface that closely contacts the inner peripheral surface of the joint portion 1a of the joint pipe 1.
The tightening nut 2 is made of fluororesin mixed with short carbon fibers, and has a threaded portion 11 inside it. The main body part 19 has a thick press part 2b on the circumferential surface and has a thick pressing part 2b at the tip, and a flange part 13 that protrudes radially inward at the rear end of the main body part 19. is equipped with a connecting pipe insertion hole 15, and the pressing surface 12 of the collar 13 presses the seat ring 4 toward the tapered part of the connecting pipe 3, so that the inner circumferential surface of the tip end of the seat ring 4 is pressed against the tapered part of the connecting pipe 3. The seat ring 4 is brought into close contact with the outer circumferential surface of the main body 28 of the connecting tube 3, and a part of the inner circumferential surface of the seat ring 4 is annularly bulged inward in the radial direction so as to bite into the outer circumferential surface of the main body 28 of the connecting pipe 3. pipe fittings. (2) The short carbon fibers mixed into the tightening nut 2 have a diameter of 2 to 20 μm and a length of 0.01 to 20 μm.
The pipe joint according to claim 1 of the utility model registration claim, which has a diameter of 20 mm. (3) The pipe joint according to claim 1 or 2, wherein the short carbon fibers are mixed in the tightening nut 2 in a proportion of 1 to 40 wt%.