JPH0524395B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for joining pipe bodies, and in particular, to heat pressure welding of pipe bodies and pipe joints used in, for example, refrigeration piping for refrigerators and air conditioners. The present invention relates to a suitable method for joining tube bodies.

[Background of the invention]

Conventionally, as a method for joining piping parts, for example, as described in Japanese Patent Publication No. 52-830 or Japanese Unexamined Patent Publication No. 56-154276, a brazing material is applied to the inner periphery of a pipe joint formed from a circular pipe. It is known that the pipe ends of the pipes to be joined are inserted into a pipe joint by filling the joint with the pipe and then heated and joined.

In this method, when automating the pipe joining process, no consideration was given to the fact that work such as applying or filling the inner periphery of the pipe joint with brazing material would be manual work or would require special measures.

On the other hand, as described in, for example, Japanese Patent Publication No. 55-13832 or Japanese Patent Application Laid-open No. 58-163572, there are pipe fittings that are split into parts, and these make it possible to automate the installation of brazing filler metal. However, insufficient consideration was given to the fact that the number of man-hours required in this process increases, such as by welding the mating surfaces of the divided members and by temporarily fixing them using a fixing jig for joining work.

[Purpose of the invention]

The present invention was made in view of the actual state of the prior art described above, and it is easy to attach joining auxiliary materials such as insert materials, there is no need for temporary fixing during joining work, and automation of the joining process is easy. Its purpose is to provide a method for joining pipe bodies.

[Summary of the invention]

The method for joining pipe bodies according to the present invention includes: attaching a flat plate with an insert material adhered to one side, and inserting a recess into which each pipe end of the pipe bodies to be joined can fit into the flat plate on the side to which the insert material is adhered; A pipe joint member is formed by forming a curved portion and a concave curved portion that is to become a flow path, and the concave curved portion for inserting the pipe body of the pipe joint member surrounds each pipe end of the pipe bodies to be joined. In this method, the pipe fitting members are overlapped, and in this state, the overlapping portions of the pipe fitting members are welded under heat and pressure.

Additionally, the idea behind developing the present invention is as follows:
It is as follows.

For joining pipe bodies such as piping parts, heat pressure welding using an insert material as a joining auxiliary material is considered to be the optimal method because it shortens the joining time and it is easy to automate the joining process.

It is extremely easy to interpose an insert material if the location is a flat surface. Therefore, we glued an insert material to one side of a flat plate that would serve as a pipe joint member, and with the adhesive side of the insert material on the inside, we made a pair of upper and lower parts of the flat plate to form a channel and a hole for inserting the pipe body. The idea was to press the joint member, insert the pipe body to be joined into the hole, and simultaneously heat and pressure weld the pipe body and the pipe fitting around the flow path to join the pipe body and the pipe joint. It is something.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 11.
This will be explained with reference to the figures.

First, FIG. 1 is a perspective view of a flat plate to which insert materials are bonded for use in each embodiment of the present invention, and FIG. 2 is a perspective view of each member showing a method of joining copper pipes according to an embodiment of the present invention. A perspective view, FIG. 3 is a perspective view showing a state where each member of FIG. 2 is joined.

A flat plate 1 shown in FIG. 1 has an insert material 2 adhered to one side thereof. If the pipe bodies to be joined are copper pipes, the flat plate 1 may be a copper plate made of the same material.

Insert material 2 is made of tin (Sn), zinc (Zn), phosphorous copper, brass, etc., which has a melting point lower than that of copper, and is fused to the joint surface of the pipe body and pipe fitting member by heat pressure welding. It serves as a joining aid.

The thickness thereof is a thin layer ranging from 0.01 mm to 0.1 mm, and for adhesion to the flat plate 1, methods such as plating, thermal spraying, or pressure welding of foil material can be selected as appropriate.

The flat plate 1 with the insert material 2 adhered to one side is press-worked to produce vertically symmetrical pipe joint members 3 and 4 as shown in FIG. 2.

These pipe joint members 3 and 4 have concave curved parts 5 and 6 for pipe body insertion having a radius of curvature equal to or slightly smaller than the outer diameter of the copper pipes 7 and 8 to be joined on both sides to which the insert material 2 is adhered. It is formed by press working. As mentioned above, if the concave curved portions 5 and 6 for tube body insertion are formed to have a radius of curvature that is equal to or slightly smaller than the outer diameter of the copper tubes to be joined, the concave curves for tube body insertion can be formed at the time of joining. Bonding pressure between the curved portion and the copper pipes 7 and 8 can be generated.

Note that the tube body insertion concave portions 5 and 6 include a concave portion that will become a flow path after joining.

In FIG. 3, the pipe fitting members 3 and 4 are overlapped so as to surround each end of the copper pipes 7 and 8, and each end of the copper pipes 7 and 8 is fitted into the concave bent portions 5 and 6 for pipe body insertion. This shows the state in which the parts are fitted and joined.

A method of performing heat pressure welding for joining is shown in FIGS. 4 and 5.

FIG. 4 is a cross-sectional view showing how the pipe joint shown in FIG. 3 is welded under heat and pressure, and FIG. 5 is a cross-sectional view taken from FIG. 4.

As shown in the figure, the copper pipes 7 and 8 to be joined
Pipe joint members 3 and 4 overlapped so as to surround
A pair of electrodes 9 and 10 that fit closely together from the upper and lower sides are attached to the pipe joint members 3 and 4 by applying pressure to the electrodes 9 and 10 with an air cylinder (not shown) or the like. The copper tubes 7 and 8 are pressurized and fixed.

The electrodes 9 and 10 are made of a metal material with high electrical resistance, such as tungsten or stainless steel, and are heated to a temperature higher than the melting point of the insert material 2 by applying a current to the metal material such as tungsten or stainless steel. By heating to a temperature range below the melting point, the third
Bonding by heat pressure welding is performed in the state shown in the figure.

In the case of this embodiment, since the tube bodies to be joined are copper tubes 7 and 8, a copper plate was used as the flat plate 1, and a phosphor copper foil pressure-bonded was used as the insert material.
The conditions for heat pressure welding were as follows. That is, the pressure was set to 6 kg/mm ² , the heating temperature was 700° C. to 750° C. at the tip of the electrode, the energization time was 1 second, and the electrode was left to cool. As a result, the insert material 2 is fused at the joint, acts as a joining auxiliary material, and improves the reliability of the joint.

According to this embodiment, the material of the pipe joint member is a copper plate, and the insert material 2 can be easily adhered to the flat surface of the copper plate.

Since the heat pressure welding process is performed using electrodes, no temporary fixing jig or temporary fixing work is required, the bonding time is significantly shortened, and automation of the bonding process is easily achieved.

Next, FIG. 6 shows another embodiment of the present invention.
FIG. 3 is a perspective view showing a method for joining copper tubes having different outer diameters.

That is, the copper tubes 13 and 14 having different outer diameters are
Upper and lower symmetrical pipe joint members 11 and 12 are welded under heat and pressure.

As in the above-mentioned example, the pipe joint members 11 and 12 are made of a copper plate with the insert material 2 adhered to one side, and copper pipes 13 and 14 having different outer diameters can be fitted to the side to which the insert material 2 is adhered. The concave curved portion for inserting the tube and the concave curved portion to become the flow path are formed by press working. By joining these in a heat pressure welding process similar to that explained in Figs. 4 and 5, joining of copper pipes with different outer diameters can be easily performed in a short time.
Effects similar to those of the above-mentioned embodiments are expected.

Next, FIG. 7 is a perspective view showing a method for joining two rows of copper tubes according to still another embodiment of the present invention.

That is, two rows of copper tubes 17 and 18, and 19
and 20 are joined by upper and lower symmetrical pipe joint members 15 and 16, and the manufacture of the pipe joint members 15 and 16 and the heat pressure welding process are performed in the same procedure as in the previous embodiment.

As a result, the two rows of pipes can be joined efficiently in a short time, and the same effects as in the above-mentioned embodiments are expected. Of course, it is also applicable to joints and pipe joint structures of three or more rows of pipes.

Next, still another embodiment of the present invention will be described with reference to FIGS. 8 and 9.

FIG. 8 shows a further embodiment of the present invention.
FIG. 9 is a perspective view of each member showing a method of joining pipes at a branching or merging section. FIG. 9 is a perspective view showing a state in which each member of FIG. 8 is joined.

In the embodiment shown in FIGS. 8 and 9, one copper pipe 25 and two rows of copper pipes 26 and 27 are joined by upper and lower symmetrical pipe joint members 21 and 22.

As shown in FIG. 1, the pipe joint members 21 and 22 are made of a copper plate with the insert material 2 glued on one side, and the copper pipes 25 and two rows of copper pipes to be joined are respectively attached to both sides of the copper plate with the insert material 2 glued on. copper tube 2
6 and 27 can be fitted together
a, 22a, 21b, 22b, and concave curved portions 23, 24, which are to become flow paths that enable branching or merging of pipes, are formed by press working.

The upper and lower symmetrical pipe joint members 21 and 22 are superimposed so as to surround each pipe end of each copper pipe 25, 26, 27 to be joined, that is, each of the copper pipes 25, 26, 27 is Fit the tube end into the corresponding concave bent portion for tube body insertion. Then, in this state, if heat pressure welding is performed as previously shown in FIGS. 4 and 5, the pipes at the branching or merging portions will be joined as shown in FIG. 9.

According to this embodiment, the branching or merging portions of the pipes can be easily joined in a short time, and the same effects as those described in the embodiments shown in FIGS. 2 and 3 can be expected.

Note that the shape and size of the flow path 28 in the pipe joint created by the joining method of this embodiment may be changed depending on the application, and the copper pipes to be joined may have a plurality of three or more rows on one side. Needless to say, this can also be accommodated by adding a concave portion for pipe insertion.

In each of the above-mentioned embodiments, a method for joining pipe bodies is shown in which a pipe fitting is obtained by forming two sheets of plate material and overlapping them. The method will be explained with reference to FIGS. 10 and 11.

FIG. 10 is a perspective view of each member showing a method for joining piping at a branch or merging section according to still another embodiment of the present invention, and FIG. 11 is a perspective view showing a state in which each member of FIG. 10 is joined. It is a diagram.

The embodiment shown in Figs. 10 and 11 is an example in which the pipe joining method for obtaining a pipe joint from a single plate is applied to the piping conditions shown in Figs. 8 and 9. The same reference numerals as in FIG. 9 indicate the same members.

As shown in FIG. 10, the pipe joint member 30 is made of a copper plate 1' with an insert material 2 adhered to one side.
After bending the insert material 2 so that the bonded surface is on the inside, a concave curved portion for inserting the pipe into which the copper pipe 25 to be joined and the two rows of copper pipes 26 and 27 can be fitted is placed on the opposing inner sides. 31 and 3
2, 33, and a concave curved portion 29 that is to become a flow path that allows the piping to branch or merge are formed by press working.

The concave bent portion 3 for pipe insertion of this pipe joint member 30
1, 32, 33, each copper pipe 2 to be joined
The tube end portions 5, 26, and 27 are inserted, and the tube joint member 30 is overlapped so as to surround each of these tube end portions.

Then, in this state, if heat pressure welding is performed as previously shown in FIGS. 4 and 5, the pipes at the branching or merging portions will be joined as shown in FIG. 11.

According to this embodiment, effects exactly similar to those of the embodiments shown in FIGS. 8 and 9 can be expected.

Although not illustrated and explained, the method of joining the pipe bodies to obtain a pipe joint from a single plate shown in Fig. 10 is similar to the pipe joining method of each embodiment shown in Figs. 2, 3, and 7. is also applicable.

Further, in each of the above-mentioned embodiments, the pipe body is a copper pipe and the pipe joint member is made of copper. However, it is to be understood that the present invention can be applied to the pipe body and pipe joint member made of other materials. Not even.

〔Effect of the invention〕

As described above, according to the present invention, a method for joining pipe bodies is provided in which it is easy to attach joining auxiliary materials such as insert materials, there is no need for temporary fixing during joining work, and the joining process can be easily automated. can be provided.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a flat plate to which an insert material is bonded, which is used in each embodiment of the present invention, and FIG. 2 is a perspective view of each member showing a method of joining copper pipes according to an embodiment of the present invention. , FIG. 3 is a perspective view showing a state in which the members shown in FIG. 2 are joined together, FIG. 4 is a cross-sectional view showing a heat pressure welding method for the pipe joint shown in FIG. 3, and FIG.
FIG. 4 is a cross-sectional view, FIG. 6 is a perspective view showing a method of joining copper tubes with different outer diameters according to another embodiment of the present invention, and FIG. 7 is a further embodiment of the present invention. FIG. 8 is a perspective view showing a method of joining two rows of copper pipes according to another embodiment of the present invention; FIG. 8 is a perspective view showing a state in which each member in FIG. 8 is joined; FIG. 10 is a perspective view of each member showing a method for joining piping at a branch or merging section according to still another embodiment of the present invention; FIG. 11 is a perspective view showing a state in which the members shown in FIG. 10 are joined. 1, 1'... Flat plate, 2... Insert material, 3,
4... Pipe joint member, 5, 6... Concave bent portion for pipe body insertion, 7, 8... Copper tube, 9, 10... Electrode, 11,
12, 15, 16...Pipe joint member, 13, 14,
17, 18...Copper pipe, 21, 22...Pipe joint member, 21a, 21b, 21c, 22a, 22b,
22c... Concave bent portion for pipe body insertion, 23, 24... Concave bent portion to become a flow path, 25, 26, 27... Copper tube, 28, 29... Channel, 30... Pipe joint member,
31, 32, 33... Concave bent portion for pipe insertion.

Claims (1)

[Scope of Claims] 1. A flat plate having an insert material adhered to one side, and a concave bent portion for inserting a tube body into which each tube end of the tube body to be joined can be fitted onto the side to which the insert material is bonded; A pipe joint member is formed by forming a concave curved portion to serve as a flow path, and each pipe end of the pipe bodies to be joined is surrounded by the concave curved portion of the pipe joint member for insertion of the pipe body. A method for joining pipe bodies, characterized in that the pipe joint members are overlapped, and in this state, the overlapping portions of the pipe joint members are heat-press-welded. 2. In the method described in claim 1,
The pipe fitting member, which is overlapped so as to surround each pipe end of the pipe bodies to be joined, is made of two flat plates with insert material glued on one side, and a concave part for inserting the pipe body and a concave part to become a flow path. A method of joining pipes using a pipe formed with a curved part. 3. In the method described in claim 1,
A pipe joint member that is overlapped so as to surround each pipe end of the pipe bodies to be joined is made by bending a single flat plate with an insert material glued to one side so that the surface to which the insert material is glued is on the inside. A method for joining tube bodies in which a concave curved portion for tube body insertion and a concave curved portion to serve as a flow path are formed on the opposing inner sides, and each tube end of the tube bodies to be joined is inserted through the concave curved portion. . 4. In the method described in claim 1,
The insert material is tin, zinc, phosphorous copper, brass, etc., and is fused to the joint surface of the pipe and pipe fitting member by heat pressure welding.A method of joining pipes. 5. In the method described in claim 1,
A method for joining pipe bodies in which the flat plate forming the pipe joint member is made of the same material as the pipe bodies to be joined. 6. In the method recited in claim 1,
In heat pressure welding, a pair of electrodes that can be brought into close contact with each other from both sides are provided on the pipe fitting members stacked so as to surround each pipe end of the pipe bodies to be joined, and pressure is applied to these electrodes, and the melting point of the insert material is A method for joining pipe bodies in which heating is performed in a temperature range that is higher than the melting point of the pipe fitting member and the pipe bodies to be joined.