JP2000249264A - Piping joint construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently distribute solder on the outer circumference of the end part of a piping so as to have sufficient joint strength and perform correct positioning in the radial direction of the piping against a member to be fitted by forming a plurality of recessed parts reaching the end face on the outer circumference of the end part of the piping so as to be filled with solder at intervals in the circumferential direction. SOLUTION: A member to be fitted 1 is formed out of an annular part 3 and a cylindrical part 4 projecting from the outer circumference, the inner circumference of the insert hole 4a formed on the inner circumference of the cylindrical part 4 is formed with step difference, the extreme end side of the cylindrical part 4 is formed with larger inner diameter than the root side, and soldering is executed through solder between the inner circumference and the outer circumference of the end part of an inserted piping 5 made of aluminum series material. An eye bolt 6 inserted into the annular part 3 of the member to be fitted 1 is screwed in the female screw formed on the inner circumference of a piping 7, and both pipings 5, 7 are communicated to each other through the passage 6a of the bolt 6. Further on the outer circumference of the end part of the piping 5, three recessed parts reaching the end face at equal intervals are formed in the circumferential direction so as to be filled with solder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a pipe is covered by a brazing material interposed between an inner periphery of an insertion hole of a member to be attached and an outer periphery of an end of the pipe inserted into the insertion hole. The present invention relates to a pipe joint structure brazed to a mounting member.

[0002]

2. Description of the Related Art A brazing material melted in a heating furnace is supplied between an inner periphery of an insertion hole of a member to be attached and an outer periphery of an end of a pipe inserted into the insertion hole. When the brazing is performed by infiltrating the brazing material, if the difference between the inner diameter of the insertion hole and the outer diameter of the pipe is small, the brazing material cannot be sufficiently distributed between the inner and outer circumferences, and the joint strength decreases. In particular, sufficient joint strength cannot be obtained with piping made of an aluminum-based material. On the other hand, if the difference between the inner diameter of the insertion hole and the outer diameter of the pipe is increased, it becomes impossible to accurately position the pipe in the radial direction with respect to the attached member.

[0003] It is an object of the present invention to provide a pipe joint structure capable of solving the above-mentioned problems.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method of forming a pipe through a brazing material interposed between an inner circumference of an insertion hole of a member to be mounted and an outer circumference of an end of a pipe inserted into the insertion hole. In the pipe joint structure in which is brazed to the member to be attached, a plurality of recesses reaching the end face are formed on the outer circumference of the end of the pipe so as to be filled with the brazing material at circumferential intervals. It is characterized by. According to the configuration of the present invention, the brazing material melted in the heating furnace is placed in a plurality of recesses between the inner periphery of the insertion hole of the attached member and the outer periphery of the end of the pipe inserted into the insertion hole. Can be satisfied, and joint strength can be secured. Moreover, since the plurality of recesses are formed at intervals in the circumferential direction, the difference between the outer diameter of the pipe and the inner diameter of the insertion hole is reduced between the recesses, and the diameter of the pipe relative to the member to be mounted is reduced. Positioning accuracy in the direction can be improved. Further, since the plurality of recesses are formed at intervals in the circumferential direction, the outer peripheral surface of the pipe between the recesses is formed inside the insertion hole even if the dimension of the insertion portion of the pipe end into the insertion hole is short. By being supported on the peripheral surface,
The fall of the pipe with respect to the attached member can be prevented.

[0005] The end of the pipe may be press-fitted into the insertion hole. Thereby, the fall of the pipe with respect to the attached member can be reliably prevented.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The attached member 1 in the pipe joint structure shown in (1) and (2) of FIG. 1 has an annular portion 3 and a tubular portion 4 protruding from the outer periphery of the annular portion 3. Is formed as an insertion hole 4a. The insertion hole 4
A step is formed on the inner circumference of a, and the inner diameter is larger at the tip side of the tubular portion 4 than at the root side. The piping is inserted through a brazing material interposed between the inner periphery of the insertion hole 4a on the distal end side of the cylindrical portion 4 and the outer periphery of the end of the aluminum-based material pipe 5 inserted into the insertion hole 4a. 5 is brazed to the member 1 to be mounted. The eye bolt 6 inserted into the annular portion 3 is screwed into a female screw formed on the inner periphery of another pipe 7 indicated by a two-dot chain line, and the eye bolt 6
The two pipes 5 and 7 communicate with each other via a passage 6a formed in the pipe.

As shown in FIGS. 2 and 3 (1) and (2), three recesses 5b reaching the end face 5a are provided at the outer periphery of the end of the pipe 5 at equal intervals in the circumferential direction. Is formed to be satisfied by In the present embodiment, the concave portion 5b is formed by machining, and has a rectangular shape having one side defined by the end surface 5a when viewed from the radial direction of the pipe 5. The axial dimension L1 of the recess 5b of the pipe 5 is smaller than the insertion dimension L2 of the pipe 5 into the insertion hole 4a. The depth of the recess 5b can be about several tens of μm.

In order to braze the pipe 5 to the member 1 to be attached, as shown in FIG. 2, an end of the pipe 5 is inserted into the inner periphery of the insertion hole 4a via an annular brazing material 8, and the brazing material is used. 8
Is melted in a heating furnace and penetrated between the inner circumference of the insertion hole 4a and the outer circumference of the end of the pipe 5. At this time, the brazing material melted in the heating furnace can fill the plurality of recesses 5b between the inner circumference of the insertion hole 4a and the outer circumference of the end of the pipe 5, and the joint strength can be secured. Moreover, since the plurality of recesses 5b are formed at intervals in the circumferential direction, these recesses 5b
In the meantime, the difference between the outer diameter of the pipe 5 and the inner diameter of the insertion hole 4a is reduced, and the positioning accuracy of the pipe 5 with respect to the attached member 1 in the radial direction can be improved. Further, since the plurality of recesses 5b are formed at intervals in the circumferential direction, even if the insertion portion dimension L of the pipe end into the insertion hole 4a is short, the outer peripheral surface of the pipe 5 between the recesses 5b. By supporting 2 ′ on the inner peripheral surface of the insertion hole 4a, it is possible to prevent the pipe 5 from falling with respect to the attached member 1.

In the above embodiment, a slight gap is provided between the outer circumference of the pipe 5 and the inner circumference of the insertion hole 4a between the recesses 5b, so that the pipe 5 can be easily inserted into the insertion hole 4a. The end of the pipe 5 is inserted into the insertion hole 4a by eliminating the gap.
May be press-fitted. Thereby, the fall of the pipe 5 with respect to the to-be-attached member 1 can be reliably prevented.

The present invention is not limited to the above embodiment. For example, as shown in FIG. 4, each recess 5b formed in the pipe 5 may be formed by drawing. Further, the number of the plurality of concave portions formed in the pipe is not particularly limited. Further, the circumferential intervals of the concave portions need not be equal to each other. The member to be attached is not particularly limited as long as the pipe is brazed. For example, the member to be attached may be a pipe. The material of the member to be attached and the pipe is not particularly limited as long as it can be brazed.

[0011]

According to the present invention, sufficient joint strength between the pipe and the member to be mounted can be ensured, and the positioning of the pipe with respect to the member to be mounted in the radial direction can be accurately performed. A pipe joint structure capable of preventing the pipe from falling down with respect to the member can be provided.

[Brief description of the drawings]

FIG. 1 shows a pipe joint structure according to an embodiment of the present invention (1).
Is a sectional view, and (2) is a plan view.

FIG. 2 is a cross-sectional view of the pipe and the attached member according to the embodiment of the present invention in a separated state.

FIG. 3 is a front view of the pipe according to the embodiment of the present invention,
(2) is a perspective view

FIG. 4 is a perspective view of a pipe according to a modified example of the present invention.

[Explanation of symbols]

 1 attached member 4a insertion hole 5 piping 5b recess

Claims (2)

[Claims] 1. A pipe is brazed to a member to be mounted via a brazing material interposed between an inner periphery of an insertion hole of the member to be mounted and an outer periphery of an end of the pipe inserted into the insertion hole. In the piping joint structure that is
A pipe joint structure, wherein a plurality of concave portions reaching an end face are formed so as to be filled with a brazing material at intervals in a circumferential direction. 2. The pipe joint structure according to claim 1, wherein an end of the pipe is press-fitted into the insertion hole.