JP3114318B2 - Piping connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping connection structure suitable for mutually connecting a pair of pipings used in a refrigeration cycle of an air conditioner mounted on a vehicle and other various devices.

[0002]

2. Description of the Related Art Conventionally, for example, in a piping connection structure of a refrigeration cycle of a vehicle air conditioner, a union is brazed from the outside to the tip of one of the pipes at its annular base, and the union is connected to the annular base. At the cylindrical portion extending from the outside, fitted to the tip of the other pipe via an O-ring from outside,
The nut is brought into contact with a bead formed annularly projecting outward at the tip of the other pipe at the annular contact portion from the side opposite to the one pipe, and extends from the annular contact portion. There is a nut part which is detachably screwed to the cylindrical part of the union from the outside so as to connect both pipes coaxially.

[0003]

However, in such a configuration, depending on the degree of screwing of the union and the nut, the tip of the union and the bead portion of the other pipe may hit each other too strongly, and As a result, the tip of the other pipe and the bead portion are deformed, so that not only the coaxial connection of the two pipes cannot be properly realized, but also the separation of the two pipes from each other becomes difficult. To deal with this, it is conceivable to form the other pipe with a material having a higher mechanical strength than the material forming the one pipe or the union, but since both pipes need to be easy to process. In addition, there are restrictions on the choice of piping materials.

[0004] In order to cope with such a problem, the present invention intends to connect the two pipes properly and detachably with a union and a nut in the pipe connection structure regardless of the pipe material. Is what you do.

[0005]

[MEANS FOR SOLVING THE PROBLEMS]
Therefore, the structural features of the present invention are
Be arrangedFirst pipe (10) and second pipe (20)
When,Fitted to the tip (11) of the first pipe (10)
A cylindrical portion extending coaxially from the first pipe (10)
And a union (30, 30A) having (33, 34)
The tip (21) of the second pipe (20)
It is arranged coaxially inside the cylindrical portion (33, 34).
And a ring outwardly at the tip (21) of the second pipe (20).
Forming a bead portion (22) projecting in the shape of a bead,
(22) is opposed to the tip of the cylindrical portion (33, 34).
Let In the bead portion (22), the first pipe (1
0) nut on the second pipe (20) from the opposite side
(50) is fitted coaxially, and the cylindrical portions (33, 34) are fitted.
Between the end of the second pipe (20) and the tip (21)
A sealing material (40) is fitted, and the nut (50) is
An annular contact portion (51) contacting the bead portion (22) and the annular contact portion (51);
The cylindrical portion extends coaxially from an annular contact portion (51).
A nut portion (5) detachably screwed to (33, 34).
2), the nut (5)
0) The annular contact portion (51) and the cylindrical portion (33, 34)
The reinforcing members (70, 70A) are arranged between the
The bead portion (22) is attached to the reinforcing member (70, 70A).
An annular cover part (73) for covering the outer peripheral edge of
Between the tip (22) and the tip of the cylindrical part (33, 34).
An annular wall portion (72) sandwiched between the
The reinforcing member (70, 70A) is connected to the first pipe (10) or the front.
Material with higher mechanical strength than the union (30, 30A)
And a shaft of the annular cover portion (73).
The dimension in the direction is larger than the dimension in the axial direction of the bead portion (22).
Then, the nut portion (52) of the nut (50) is
When screwed into the portions (33, 34), the reinforcing member (7
0, 70A) in the axial direction is the annular contact portion (5).
1) abut against the reinforcing member (70, 70A) in the axial direction
The other end of the cylindrical part Abuts on the tip of (33, 34)
That I did.Note that the symbols in parentheses for each of the above means
The symbol indicates the correspondence with the specific means described in the embodiment described later.
It shows the person in charge.

[0006] In the present invention configured in this manner, complement
The annular wall (72) of the strong member (70, 70A) is the second pipe
(20) is fitted to the tip (21) of the bead (2).
2) and the tip of the cylindrical portion (33, 34)
And an annular cover of the reinforcing member (70, 70A)
(73) covers the outer peripheral edge of the bead portion (22)
(50) and comes into contact with the annular contact portion (51). in this case
In addition, the axial dimension of the annular cover portion (73) is changed to the bead portion (2).
The first and second arrangements are larger than the axial dimension of 2).
When connecting the pipes (10, 20), the nut (50) is
Screw on the cylindrical part (33, 34) of the Nion (30, 30A)
When setting the nut (5)
0) is applied to the reinforcing member (70, 70A)
Only, the nut tightening force is directly applied to the bead part (22).
Will not join. Moreover, reinforcing members (70, 70A)
Is a pipe (10, 20) made of a material with high mechanical strength in advance.
Since it is formed separately from the nut, tighten the nut (50)
Make sure that the reinforcing force (70, 70A) is sufficient
And the deformation of the reinforcing members (70, 70A) does not occur.
No. Therefore, the normal shape of the bead portion (22) is maintained.
Leave the nut (50) and union (30, 30A)
Coaxial connection of both pipes (10, 20)
be able to. As a result, the tightening force of the nut (50)
The bead (22) is deformed by the
Problems such as difficulty in separation between 0) can be prevented. Sa
In addition, the reinforcing member (70, 70A) is connected to both pipes (10, 2).
0) and the reinforcing member (70, 70A)
Even when formed of a material having high mechanical strength, both pipes (10,
20) Select a material with good workability such as aluminum
Therefore, the problem of deterioration in workability of both pipes does not occur.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A shows a coaxial connection between two pipes 10 and 20 in a refrigeration cycle of a vehicle air conditioner, to which the present invention is applied. An example is shown. The two pipes 10 and 20 are formed of a pipe material that is easy to press or the like. A union 30 is fitted to the tip 11 of the pipe 10 coaxially from the outside by brazing 32 at its annular base 31. Is being worn. The union 30 has a cylindrical portion 33 coaxially extending from the annular base portion 31 toward the distal end portion 21 of the pipe 20.
The cylindrical portion 33 is fitted to the distal end portion 21 coaxially from the outside via an O-ring 40.

An annular bead portion 22 is formed at the distal end portion 21 of the pipe 20 in the vicinity of the distal end of the cylindrical portion 33 of the union 30 so as to protrude outward in the radial direction by bulging so as to face the distal end. I have. The nut 50 is loosely fitted coaxially to the pipe 20 from the left side of the bead portion 22 in FIG. 1 (A) as shown in FIG.
1 is in contact with the outer peripheral portion of the bead portion 22 at its inner peripheral edge. The nut 50 is provided with an annular contact portion 51.
Has a nut portion 52 extending coaxially from the union 30 toward the tip of the pipe 10.
Is coaxially and detachably screwed to a male screw portion 33a formed on the outer peripheral surface of the cylindrical portion 33.

The reinforcing member 60 is connected to the pipe 10 or the union 30
As shown in FIGS. 1A and 1C, the reinforcing member 60 is formed of a material having higher mechanical strength and hardness than the material of the O-ring 40.
At (A), it is coaxially fitted to the tip 21 of the pipe 20 on the right side in the figure. In such a case, the outer diameter of the reinforcing member 60 is determined so that a gap is provided between the outer peripheral surface of the reinforcing member 60 and the inner peripheral surface of the cylindrical portion 33 of the union 30. 1A and 1B, the reinforcing member 70 is formed of the same material as that of the reinforcing member 60 in a stepped cylindrical shape. The bead portion 22 and the O-ring 4
0, it is coaxially fitted to the tip 21 of the pipe 20 from outside.

The reinforcing member 70 has an annular wall portion 72 extending radially outward from the left end of each of the annular shaft portions 71 shown in FIGS. 1A and 1B. Wall 72
Are the bead portion 22 of the pipe 20 and the cylindrical portion 3 of the union 30
3 is sandwiched between them. Further, the reinforcing member 70 is provided from the outer peripheral edge of the annular wall portion 72 as shown in FIGS.
Has an annular cover portion 73 extending to cover the outer peripheral edge of the bead portion 22 toward the left of the drawing, and the annular cover portion 73 has an annular contact portion of the nut 50 at its tip. 5
1 is in contact with the inner peripheral surface. In such a case, the annular wall portion 72
1 (A) and 1 (B), the extension length of the annular cover portion 73 from each of the illustrated left surfaces is slightly longer than the axial thickness of the bead portion 22.

In the embodiment constructed as described above,
In connecting the two pipes 10 and 20 coaxially, first, the annular shaft portion 71 of the reinforcing member 70 is coaxially connected to the distal end portion 21 of the pipe 20 from the right side of the bead portion 22 in FIG. The outer peripheral edge of the bead portion 22 is coaxially covered by the annular cover portion 73 of the reinforcing member 70 such that the annular wall portion 72 of the reinforcing member 70 abuts on the bead portion 22 while being fitted. Next, after the O-ring 40 is fitted to the distal end 21 of the pipe 20 from outside, the reinforcing member 60 is fitted coaxially to the distal end 21.

Thereafter, the nut 50 is coaxially loosely fitted to the pipe 20 from the left side of the bead portion 22 in FIG. 1A. Then, while the annular contact portion 51 of the nut 50 is in contact with the bead portion 22, the nut portion 52 is attached to the cylindrical portion 33 of the union 30 brazed to the distal end portion 11 of the pipe 10, and to the male screw portion 33 a thereof. And screwed coaxially. At this time, the screwing operation is such that the cylindrical portion 33 of the union 30 is
0, coaxially and loosely fitted to the tip 21 of the pipe 20 via
The process is performed until the nut 50 comes into contact with the inner peripheral surface of the annular contact portion 51. Thereby, the two pipes 10 and 20 are coaxially connected by the union 30 and the nut 50.

In this case, since the reinforcing members 60 and 70 are formed of a material having higher mechanical strength and hardness than the pipe 10 and the union 30, the nut 50 and the union 3
Even if the screwing with 0 is too strong, the reinforcing members 60 and 70 will not be deformed, and therefore the distal end portion 21 and the bead portion 22 of the pipe 20 will not be deformed. As a result, Union 3
Coaxial connection of the two pipes 10 and 20 by screwing the nut 0 and the nut 50 can be properly performed, and separation of the pipes 10 and 20 by unscrewing the union 30 and the nut 50 can be easily performed. In addition, since the above-described effects can be achieved only by employing the two reinforcing members 60, 70, the two pipes 1
Materials having high workability can be used as the piping materials 0 and 20 as before.

Next, a modification of the above embodiment will be described with reference to FIG. 2. In this modification, a union 30A and a reinforcing member are used instead of the union 30 and the reinforcing member 70 described in the above embodiment. 70A each, and
The constructional feature is that the reinforcing member 60 described in the above embodiment is omitted. Union 30A
In the union 30, instead of the cylindrical portion 33, the cylindrical portion 3
It has the same configuration as the union 30 except that the 4 extends coaxially from the annular base 31. In such a case, an annular recess 34a is formed on the inner peripheral surface of the distal end of the cylindrical portion 34, and a male screw portion 34 is formed on the outer peripheral surface of the cylindrical portion 34.
b is formed. The reinforcing member 70A includes a reinforcing member 70A.
, Except that the annular shaft portion 71 is omitted.
Has the same configuration as The O-ring 40 is pressed against the outer peripheral surface of the distal end portion 21 of the pipe 20 by the concave portion 34a of the cylindrical portion 34. Other configurations are the same as those in the above embodiment.

In the present modified example having the above-described structure,
In connecting the two pipes 10 and 20 coaxially, first, the annular wall portion 72 of the reinforcing member 70A is coaxially fitted to the distal end portion 21 of the pipe 20 from the right side of the bead portion 22 in FIG. At the same time, the outer peripheral edge of the bead portion 22 is coaxially covered by the annular cover portion 73 of the reinforcing member 70A so as to be brought into contact with the bead portion 22. Next, the O-ring 40 is fitted to the distal end portion 21 of the pipe 20 from outside. After that, the nut 50 is coaxially loosely fitted into the pipe 20 from the left side of the bead portion 22 in FIG. Then, while the annular contact portion 51 of the nut 50 is in contact with the bead portion 22, the nut portion 5
2 in which union 3 is brazed to tip 11 of pipe 10
It is coaxially screwed to the cylindrical portion 34 of 0A with its male screw portion 34b. At this time, the screwing operation is performed by connecting the cylindrical portion 34 of the union 30A to the distal end 2 of the pipe 20 via the O-ring 40.
1 and the annular contact portion 51 of the nut 50
Until the inner peripheral surface is brought into contact. Thus, the two pipes 10 and 20 are coaxially connected by the union 30A and the nut 50.

In such a case, since the reinforcing member 70A is made of a material having higher mechanical strength and hardness than the pipe 10 and the union 30A, similarly to the above embodiment, the nut 50 and the union 30A are screwed together. If the reinforcing member 70A is too strong, the reinforcing member 70A will not be deformed, and therefore, the distal end portion 21 and the bead portion 22 of the pipe 20 will not be deformed. As a result, both pipes 1 are screwed by union 30A and nut 50.
0 and 20 can be properly connected, and the union 30A and the nut 50 can be unscrewed from each other.
Separation of 0 and 20 can also be easily achieved. In addition, since the above-described effects can be achieved only by employing the reinforcing member 70A, a material having high workability can be used as the pipe material of the pipes 10 and 20 as before.

In practicing the present invention, the reinforcing member 60 in the above embodiment may be omitted.

In practicing the present invention, the present invention is not limited to the piping connection in a refrigeration cycle of a vehicle air conditioner, but may be applied to piping connections employed in various other devices. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a pipe connection structure and a cross-sectional view of both reinforcing members showing an embodiment of the present invention.

FIG. 2 is a sectional view of a pipe connection structure showing a modification of the embodiment.

[Explanation of symbols]

10, 20: piping, 21: tip, 22: bead, 3
0, 30A ... union, 33, 34 ... cylindrical part, 33a,
34b: male thread, 40: O-ring, 50: nut, 5
1 ... annular contact portion, 52 ... nut portion, 70, 70A ... reinforcing member, 72 ... annular wall portion, 73 ... annular cover portion.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 19/06 F16L 19/03

Claims (1)

(57) [Claims] 1. A first coaxially disposed opposed to each other .
The pipe (10) and the second pipe (20) are fitted to the distal end (11) of the first pipe (10).
The cylindrical portion (3) coaxially extending from the first pipe (10).
(30, 30A) having a union (3, 34).
For example, the cylindrical tip portion (21) of the second pipe (20)
(33, 34) coaxially arranged inside and
The second pipe (20) projects annularly outward at the tip (21) of the second pipe (20).
A bead portion (22) is formed, and the bead portion (2) is formed.
2) is opposed to the tip of the cylindrical portion (33, 34), and the bead portion (22) is connected to the first pipe (10).
Is a nut (50) on the second pipe (20) from the opposite side.
Are fitted coaxially, and the cylindrical portion (33, 34) and the tip of the second pipe (20) are fitted.
An annular sealing material (40) is fitted between the end portion (21) and the nut (50) comes into contact with the bead portion (22).
Coaxial from the annular contact portion (51) and the annular contact portion (51)
And is detachably screwed to the cylindrical portion (33, 34).
The pipe connection structure provided with the nut part (52) to be attached
There are, said annular abutment of the nut (50) (51) and the cylindrical portion
A reinforcing member (70, 70) is provided between the tip of (33, 34).
A) is disposed, and the reinforcing member (70, 70A) is
An annular cover portion (7) for covering the outer peripheral edge of the bead portion (22).
3) and the bead portion (22) and the cylindrical portion (33,
34), the annular wall portion (72) sandwiched between
The reinforcing member (70, 70A) is formed physically and the first pipe (10)
And higher mechanical strength than the union (30, 30A)
The ring-shaped cover portion (73) is formed of a material.
Is larger than the axial dimension of the bead portion (22).
Large cities, the nut the cylindrical part nut (52) (50)
When screwed into (33, 34), the reinforcing member (7
0, 70A) in the axial direction is the annular contact portion (5).
1) abut against the reinforcing member (70, 70A) in the axial direction
Characterized in that the other end side of the pipe contacts the tip of the cylindrical portion (33, 34) .