Pipe joint connected with pipe

Abstract

The invention provides a pipe joint connected with a pipe. The pipe joint connected with the pipe comprises a joint body, an inner ring and a screw cap, wherein a transition section is arranged between an expanding conical surface of a projection part of the inner ring and a reducing conical surface of the projection part of the inner ring; the axial length of the transition section is 15 percentto 30 percent of the axial length of the projection part; an included angle between a tangent line at any point on the outer surface of the transition section and the axial direction of the inner ringis 0 degree to 35 degrees; and an included angle between the axial direction of the inner ring and the expanding conical surface is larger than an included angle between the axial direction of the inner ring and the reducing conical surface. The outer surface of the transition section of the projection part and the inner wall of the pipe form surface contact, so that the action area is increased;an extrusion action force between the outer surface of the transition section of the projection part and the inner wall of the pipe is dispersed, and the bending curvature of the pipe is further reduced through the transition section, so that the damage on the pipe is reduced, and the expanding conical surface and the inner wall of the pipe tightly contact and are fastened; and the included anglebetween the axial direction of the inner ring and the expanding conical surface is larger than the included angle between the axial direction of the inner ring and the reducing conical surface, so that the pipe is prevented from outwards slipping off along the reducing conical surface under the high-temperature environment.

Description

technical field [0001] The invention belongs to the technical field of pipe fitting connection, and in particular relates to a pipe joint used in fluid delivery and fluid treatment processes. Background technique [0002] U.S. Patent US5743572A discloses a pipe joint commonly used in the manufacturing process of semiconductor manufacturing, pharmacy, food processing and chemical industry and other technical fields for fluid delivery, as attached figure 1 and 2 As shown, the pipe joint is composed of three parts: a joint body 1 , an inner ring 2 and a nut 3 , and an annular groove 13 is formed between the outer cylinder portion 11 and the inner cylinder portion 12 of the joint body 1 . During use, the front end of the pipe 4 made of resin is sleeved on the outer periphery of the inner ring 2 after flaring, and then inserted into the joint main body 1 together with the inner ring 2, and the pipe 4 is fixed inside the outer cylinder part 11, and the insertion part 21 of the ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the protruding part of the inner ring of the existing pipe joint is easy to cause damage to the pipe, the outer surface near the thickest part of the protruding part is not in close contact with the inner wall of the pipe and the pipe slides out along the inner ring in a high temperature environment The problem of sealing failure caused, the present invention provides a pipe joint connected with the pipe

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