Pipe joint structure

Abstract

To provide a pipe joint construction with which swift and strong connection is possible without flare work on an end portion when a pipe composed of aluminum, a pipe joint construction provided with a joint main body 1 with a male screw and a cap nut 3 screwed to a male screw 2 of the joint main body 1 to connect an aluminum pipe 4, has a cylindrical compressed deformation sleeve 7, stored in an inner storing space 10 of the cap nut 3 and having a concave peripheral groove 9 on a peripheral face 8, in which a bottom thin wall portion 13 of concave groove, receiving compressing force F in axial direction from the joint main body 1 and the cap nut 3 when the cap nut 3 and the male screw 2 of the joint main body are screwed, is plastically deformed in a radial inner direction to bite into a peripheral face 14 of an inserted aluminum pipe 4 for stopping the aluminum pipe 4.

Description

technical field [0001] The present invention relates to a pipe joint structure. Background technique [0002] As one of the pipe joints, flared pipe joints are widely used (for example, refer to Patent Document 1). [0003] Generally, its structure is as follows Figure 11 As shown, the bell mouth end 37 formed by plastically processing the end of the copper pipe 35 in an enlarged diameter cone shape is clamped on the tapered surface 31 of the joint body 30 with external threads and screwed on the joint body. 30 on the external thread 32 of the cap nut 33 on the tapered surface 34, and by means of crimping force to seal. [0004] However, in recent years, as a material of the tube 35 , it has been strongly desired to use aluminum which is cheap and lightweight rather than copper which is expensive and heavy. In the case where the pipe 35 is made of aluminum, there is a disadvantage that it is difficult to implement the bell mouth machining. Of course, even in the case of ...

AI Technical Summary

Problems solved by technology

In the case where the tube 35 is made of aluminum, there is the disadvantage that it is difficult to perform bell mouth processing

Of course, even in the case of copper pipes, the above-mentioned bell mouth processing needs to be performed on site, so there is a disadvantage that the efficiency of piping work is hindered.

In addition, in order to avoid these problems, various pipe joint structures have been proposed, but there are disadvantages such as a large number of parts, the need for parts with complicated shapes, and labor-intensive assembly.

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