JP2004019840A - Pipe assembly manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method capable of easily mass-producing a defect-free and highly reliable pipe assembly formed by fitting a valve to a pipe. <P>SOLUTION: In this manufacturing method, an opening 4 is formed by recessing a part of the side face 2 of the pipe 1 without completely punching out the part thereof. The valve 20 is installed so as to cover the opening 4. The portion 6 of the pipe 1 recessed for forming the opening 4 remains as a part of the pipe 1, and any defect does not occur when the opening 4 is opened. Thus a step of removing and checking a defective portion can be eliminated, and the highly reliable pipe assembly can be provided with a lower cost. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pipe assembly in which a valve or the like is attached to a pipe, and a method for manufacturing the same.
[0002]
[Prior art]
In a vehicle-mounted air conditioning system (car air conditioner) or other air conditioning equipment and a refrigeration or cooling device, a charge valve for injecting a refrigerant into a refrigerant pipe is attached. For this purpose, first, as shown in FIG. 6A, a part of the side surface 101 of the pipe 100 is pressed using a punch 120 to form a hole 102 as shown in FIG. 6B. Next, as shown in FIG. 6C, the valve union 110 of the charge valve is inserted into the opened hole 102 and brazed. The member 105 punched out to form the hole 102 removes the pipe 100 by tilting or shaking. Thus, a pipe assembly 115 in which the charge valve is attached to the side surface 101 of the pipe 100 as shown in FIGS. 7A and 7B is manufactured.
[0003]
[Problems to be solved by the invention]
By such a manufacturing method, it is possible to manufacture a pipe assembly having a small valve with a thin pipe, but be sure to prevent a part 105 punched by drilling from flowing through the refrigerant circuit and clogging the compressor. It has to be removed, and the confirmation is troublesome and troublesome. On the other hand, if not always removed, the reliability when using the pipe assembly will be reduced.
[0004]
Also, the method of inserting the tip 111 of the valve union 110 into the pipe 100 is excellent in that the valve can be securely fixed to the pipe 100, but as shown in FIGS. The tip portion 111 projects into the pipe 100. Therefore, it has been found that when the refrigerant is circulated, high-frequency sound is generated by the Karman vortex at the portion where the valve is attached, which causes abnormal noise or noise.
[0005]
In view of the above, an object of the present invention is to provide a reliable pipe assembly in a simple process by providing a manufacturing method that does not cause a trouble afterward without confirming discharge of a punched portion. And It is another object of the present invention to improve mass productivity and to provide a low cost and highly reliable pipe assembly. It is another object of the present invention to provide a pipe assembly capable of reducing noise and a method of manufacturing the same.
[0006]
[Means for Solving the Problems]
For this reason, in the present invention, when an opening is formed in a part of the side surface of the pipe by forming an opening by denting or cutting and bending a part of the side surface of the pipe, the inside of the pipe is formed at the part of the opening. Leave the separated part in a cantilevered or two-sided state. In this way, an opening is formed without cutting a part of the pipe, and a connection surface of another pipe such as a valve is attached thereto. That is, the method for manufacturing a pipe assembly of the present invention includes a step of forming an opening by recessing a part of a side surface of a pipe, and a step of attaching a connection surface of another pipe so as to cover the opening. Alternatively, the method includes a step of forming an opening by cutting and bending a part of a side surface of the pipe, and a step of attaching a connection surface of another pipe so as to cover the opening. With this manufacturing method, the side of the pipe is dented and torn or cut off to form an opening, so the part of the opening that is separated into the inside of the pipe is cantilevered or both-sided Will remain. Therefore, unlike forming an opening by punching a part of the pipe, there is no missing part. For this reason, it is not necessary to confirm that the missing portion is discharged. Since there is no missing portion, there is no possibility that the missing portion flows out during use of the pipe assembly and causes no trouble. Therefore, a step for confirming discharge of the punched portion is not required. In addition, since there is no punched portion, a reliable pipe assembly can be provided without any accompanying trouble.
[0007]
Furthermore, the pipe assembly manufactured by the manufacturing method of the present invention is a pipe in which an opening is formed by partially recessing a side surface, and another pipe material such as a valve, and a connection surface is provided so as to cover the opening. And other piping materials attached. Therefore, another piping material such as a valve is attached to the side surface of the piping, and the tip of the connection portion of the other piping material does not protrude into the piping. Therefore, generation of abnormal noise due to Karman vortex can be prevented. There are portions left in a cantilevered or double-supported state in the piping to form openings, but they protrude into the piping in a very small length. Does not protrude vertically. Therefore, there is little possibility that a portion remaining in the pipe for providing the opening may be a factor of generating high frequency abnormal noise.
[0008]
Further, in the manufacturing method of the present invention, by pressing the periphery of the opening into a substantially flat surface and applying the connection surface to the flat surface, other pipes can be joined in a stable state. The joining method may be brazing, but by using rotary pressure welding, other pipes can be connected without using foreign matter.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 shows a state in which a pipe assembly incorporated as a part of a refrigerant circuit including a compressor and the like is manufactured by the manufacturing method of the present invention. As shown in FIG. 1 (a), a part 6 of the side surface 2 of the pipe 1 is recessed by a pressing device 8 having a punch 7 as shown in FIG. To form
[0010]
The punch 7 has a shape in which cuts 11 and 12 are provided in the side surface 2 of the pipe 1 and an opening 4 is formed by bending a portion 6 therebetween. For example, two grooves or cuts 11 and 12 each having a length of about 4 to 5 mm are formed on the side surface 2 of the pipe 1 having an outer diameter of about 15 mm at intervals of about 3 mm so as to be parallel to the longitudinal direction A of the pipe 1. can do. Then, the opening 6 is formed by pressing the portion 6 sandwiched between the cuts 11 and 12 and bending it into the pipe 1. The punch 7 of the present embodiment forms the opening 4 by simultaneously performing shearing and dent processing.
[0011]
FIG. 2 is an enlarged view of a portion where the side surface 2 of the pipe 1 is recessed by the punch 7. An opening 4 is formed by cutting and bending the side surface 2 of the pipe 1, and a portion 6 separated from the pipe 1 at the opening 4 is held on both sides 6 a and 6 b in the longitudinal direction with the pipe 1 at both ends. ing. Therefore, the portion 6 recessed inside the pipe 1 does not separate from the pipe 1 even if the opening 4 is provided, and nothing is discharged as dust even if the opening 4 is opened in the pipe 1.
[0012]
Further, by pressing the pipe 1, an elliptical flat surface or a smooth surface 9 having a major axis of about 10 mm and a minor axis of about 8 mm is formed around the opening 4 together with the opening 4. Therefore, as shown in FIG. 1C, the joint surface or the connection surface 21 of the valve 20 is brought into contact with the flat surface 9 formed on the side surface 2 of the pipe 1, and the valve 20 is rotated while being pressed toward the pipe 1. Thereby, the pipe 1 and the valve 20 are rotationally pressed (or friction welded). As a result, the connection surface 21 of the valve 20 is attached to the side surface 2 of the pipe 1 so as to cover the opening 4, and a pipe assembly that can charge the refrigerant via the valve 20 is manufactured.
[0013]
FIGS. 3A and 3B show a pipe assembly 10 manufactured by the method of the present invention. In this figure, only a portion of the pipe 1 is shown in a sectional view. In the pipe assembly 10, the recessed and cut and bent portion 6 for forming the opening 4 is left inside the pipe 1 as a part of the pipe 1 with both ends 6 a and 6 b held. For this reason, there is no loss due to the formation of the opening 4, so that the step of removing the loss can be omitted. Therefore, the manufacturing efficiency of the pipe assembly 10 can be improved, and a highly reliable pipe assembly 10 can be provided at low cost.
[0014]
Further, in this pipe assembly 10, the valve 20 is attached to the pipe 1 on the surface of the side surface 2 of the pipe 1, and a part of the valve 20 does not protrude into the pipe 1. A portion 6 bent to form the opening 4 protrudes from the inside of the pipe 1, and the protruding amount H can be easily controlled by controlling the amount of depression by pressing. Furthermore, since the portion 6 bent to form the opening 4 is smaller than the opening 4, it is naturally smaller than the outer diameter of the connecting portion of the valve 20. Further, the portion 6 bent to form the opening 4 does not vertically project into the inside of the pipe 1, but smoothly projects. Therefore, considering these conditions, the protrusion of the portion 6 bent to form the opening is smaller than in the state where the tip 111 of the valve union vertically protrudes into the pipe as shown in FIG. The resistance to the fluid flowing inside 1 is also small. Therefore, noise and pressure loss at the portion where the valve 20 is attached can be improved.
[0015]
Further, according to the manufacturing method of the present embodiment, the opening 4 having a size smaller than that of the opening 4 and having the same area as the inner diameter of the connection portion of the valve 20 may be formed instead of the opening having a size that allows passage of the valve union. Therefore, the opening 4 provided on the side surface 2 of the pipe 1 may be very small, and the influence on the strength of the pipe 1 is small. Furthermore, it is possible to secure a large area of the press contact flat surface 9 around the opening 4, and it is also possible to sufficiently secure a joint area between the valve 20 and the pipe 1. Therefore, the joint strength between the valve 20 and the pipe 1 can be sufficiently secured, and the pipe assembly 10 with high reliability in that respect can be provided. In addition, since the joining area can be increased, it is advantageous to use not only the friction welding but also other various joining techniques such as brazing and welding.
[0016]
In the manufacturing method shown in FIG. 1, two cuts are provided to form the opening 4, the portion 6 sandwiched therebetween is bent, and the recessed portion 6 is held inside the pipe 1 by both ends. Is held in. On the other hand, as shown in FIG. 4, a U-shaped cut 13 is formed, and an opening 4 is formed by pressing an inner portion 6 of the cut, and the pipe 6 is bent in a cantilevered state. 1 may be left. Even if the valve 20 is rotationally pressed against the pipe 1 having the opening 4 formed in this way, as shown in the cross section of the pipe 1 in FIG. 5A and FIG. In addition, the reliable pipe assembly 10 can be easily mass-produced.
[0017]
In this example, the valve 20 is attached to the pipe 1. However, the present invention is not limited to the valve 20, and other pipe materials, for example, a coupling for branching, a pipe itself, and the like may also be used. 1 can be attached. Further, as described above, the joining method is not limited to the rotary pressure welding.
[0018]
Further, the diameter of the pipe 1 and the numerical value of the cut are merely examples, and the present invention is not limited to these. Further, the manufacturing method of the present invention is not limited to the refrigerant piping, but can be applied to pipe assemblies for various other uses.
[0019]
【The invention's effect】
As described above, in the present invention, when forming the opening in the side surface of the pipe, instead of completely punching out a part of the pipe, a part of the pipe is depressed and remains as a part of the pipe. I have to. For this reason, since there is no loss of the pipe, a step of removing the lost portion and confirming that the pipe has been removed can be omitted, and the pipe assembly can be manufactured with a small number of steps. Also, by forming a flat surface around the opening by pressing and joining this flat surface to the connection surface of another piping material, the portion protruding into the pipe can be shortened, and noise and pressure loss of the refrigerant can be reduced.
[Brief description of the drawings]
FIG. 1 is a view showing a method for manufacturing a pipe assembly according to the present invention.
FIG. 2 is an enlarged view showing a peripheral portion of an opening formed in a pipe.
FIG. 3 is a diagram showing a pipe assembly manufactured by the manufacturing method shown in FIG. 1;
FIG. 4 is a view showing another example of an opening formed in a pipe.
FIG. 5 is a view showing a pipe assembly in which a valve is attached to the pipe having the opening shown in FIG. 4;
FIG. 6 is a view showing a conventional method for manufacturing a pipe assembly.
FIG. 7 is a view showing a pipe assembly manufactured by the manufacturing method shown in FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pipe 2 Side surface 4 Opening 6 Portion recessed to form opening 7 Punch 8 Press device 9 Flat surface 10 Pipe assembly 20 Valve 21 Joint surface

Claims (12)

Forming an opening by recessing a part of the side surface of the pipe,
Attaching a connection surface of another piping material so as to cover the opening. A step of forming an opening by cutting and bending a part of the side surface of the pipe,
Attaching a connection surface of another piping material so as to cover the opening. When forming an opening in a part of the side surface of the pipe, leaving a portion separated from the inside of the pipe in a cantilevered or double-supported state in the portion of the opening, forming an opening,
Attaching a connection surface of another piping material so as to cover the opening. The method for manufacturing a pipe assembly according to any one of claims 1 to 3, wherein the other pipe member is a valve. 4. The method of manufacturing a pipe assembly according to claim 1, wherein in the step of forming the opening, the periphery of the opening is pressed to a substantially flat surface, and in the attaching step, the connection surface is joined to the flat surface. 6. The method for manufacturing a pipe assembly according to claim 5, wherein, in the attaching step, the other pipe member and the pipe are rotationally pressed. Piping with an opening formed by recessing part of the side,
A pipe assembly, comprising: another piping member, wherein the connection surface is attached so as to cover the opening. A pipe in which an opening is formed by cutting a part of the side,
A pipe assembly, comprising: another piping member, the other piping member having a connection surface attached so as to cover the opening. When forming an opening in a part of the side surface of the pipe, a pipe which is left in a cantilevered or double-supported state at a part separated from the inside of the pipe at the opening,
A pipe assembly, comprising: another piping member, wherein the connection surface is attached so as to cover the opening. The pipe assembly according to any one of claims 7 to 9, wherein the other pipe member is a valve. The pipe assembly according to any one of claims 7 to 9, wherein the periphery of the opening is pressed to a substantially flat surface, and the connecting surface is joined to the flat surface. The pipe assembly according to claim 11, wherein the other pipe member and the pipe are rotationally pressed.

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