JPS6196280A - Method of connecting metallic pipe material by metallic sleeve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for connecting metal pipes, and more particularly to a method for connecting pipes using a brazing material using a joint sleeve.

[Prior art] Conventionally, in brazing pipe materials using a joint sleeve, the pipe materials to be connected are butted together, a sleeve is fitted to that part,
While heating the outer circumference of the sleeve with a burner or the like, the brazing material is poured into the gap between the sleeve and the pipe material from the end surface of the sleeve, and the brazing material is sucked into the sleeve by the capillary action created by the gap. The method used is to fill the gaps with wax.

However, in a sleeve with a smooth inner surface, it is difficult to always maintain a stable gap that causes the suction effect due to capillary phenomenon, and when the inner surface of the sleeve comes into contact with the outer surface of the tube material, the gap becomes almost zero and the brazing material There is a risk that it will not be sufficiently suctioned and it will become defective.

In the conventional method, the pouring material is managed by visually checking the flow and filling of the sleeve terminal, but with this method, since the sleeve terminal is poured, There is also a risk that the soldering process will be determined to be complete if the soldering material is not sufficiently sucked into the sleeve and the brazing material flows into the sleeve end I-J.

Furthermore, there is a risk that excessive heating may occur at the heating temperature m of the joint.
In particular, if there is a shortage, the fluidity of the brazing material will also decrease, and it will be determined that the soldering is complete when only the end portion of the sleeve has been brazed, and there is a risk of one soldering failure.

"Problems to be Solved" The purpose of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a simple pipe material with a highly reliable joint part.
The purpose is to provide a connection method.

F Means for Solving Problem Ij, i]-3 The gist of the present invention is to provide a pipe material in which at least one of the two pipe materials to be connected is any one of an Elphon, a Tease, a Redecorser, a screw adapter, and a union. In order to connect, ・Multiple continuous grooves in the longitudinal direction are provided on the inner surface of the coupling sleeve to create a suction effect due to capillary action.
In addition, a coupling sleeve is used in which sufficient brazing material is placed approximately in the center of the interior to fill the gap between the inner surface of the sleeve and the pipe material to be connected, and this sleeve is placed over the end of the pipe material to be connected. It is about fitting and connecting.

[Example] The present invention will be explained below with reference to the drawings.

FIG. 1 shows an assembled state of a joint in an example of the method according to the present invention, in which a joint sleeve 1 is fitted around the outer periphery of the ends of tubes 4 and 5, one of which is an elbow.

On the inner surface of this joint sleeve 1, a large number of minute grooves are continuously provided in a spiral shape, dividing the inner circumference into equal parts, in order to produce a suction effect due to capillary phenomenon. This groove 2
may extend in a straight line.

-4= Also, the cross-sectional shape of this 7m2 is not limited to a triangle;
Even if it is a trapezoid as shown in figures (a) and (t)), J: is not possible.

The sleeve 1 also has a disk 3 of row I fixed at the center of the inner surface of the sleeve 1. To fix the disk 3 to the sleeve 1, as shown in FIG. It can be carried out. Different [Fixing method: Disc 3 in the center of the inside]
It is also possible to adopt a method in which the center part of the sleeve is caulked from the outer periphery of the sleeve 1 on which the sleeve 1 is placed.

When connecting pipe materials using the sleeve 1 for a joint having such a structure, as shown in FIG. Assemble.

In this case, apply soldering flux to the soldering joint surface in advance.

However, when the sleeve 1 for a joint is used, in which flux or a mixture with flux doro I powder is applied in the groove 2 of the sleeve 1, the application of flux can be omitted.

Next, the molded and solidified heating element 6 is brought into contact with the sleeve 1-1- of the assembled joint, and the heating element 6 is ignited in this state. In this case, the heating element 6 is supported or fixed so that it does not separate from the sleeve 1.

When the starter 6 is ignited, the exothermic substance burns and an exothermic reaction occurs, heating the joint to molten metal. The melted brazing material 31 flows along the inner surface of the resleeve 1 due to capillary action, filling the gap at the joint between the sleeve 1 and the tube material 4.5, as shown in FIG.

The brazing state can be easily determined by checking whether both ends of the sleeve 1 are filled with the brazing material 31.

FIG. 7 shows another example of the present invention, in which teeth 51 are used as one of the pipe materials, and the sleeve 1 is provided with flux or a mixture 9 of flux and wax material terminals in the grooves 2 on the inner surface. is used, but heating is the first
This is done in the same way as in the example shown.

Example 1 A steel tube sleeve with an outer diameter of 7.9φ and a thickness was placed in the center of a steel pipe sleeve with an inner diameter of 8.1φ and a length of 25#, which had a spiral groove with a groove depth of 0.2m and tR number of 60 pieces machined on the inner surface. 5n-3,5% of the brain
8. The solder disk was fixed in the manner shown in FIG. 4 to form a joint sleeve.

On the other hand, as the pipe material to be connected, we used LeBeau, which is a steel pipe with an outer diameter of 8.0φ and a tone of 8.0φ, and applied soldering flux to the surface of each end. Steel pipe end from both ends of fitting sleeve? I assembled the joint by inserting it until it hit the l'ffl disk.

Next, the thermite composition was combined into three parts.
Two υ1-shaped heating elements were molded and solidified so that they could come into contact with the outer periphery of the joint, and these heating elements were ignited while they were in contact with the sleeve periphery of the assembled joint.

It was confirmed that the solder disk inside the sleeve melted due to the binding and the heat generated by the heating element, and the melted solder flowed through the grooves on the inner surface of the sleeve 1 due to capillary action and flowed out to both ends of the joint sleeve.

An internal pressure of 25 KO/cl112 was applied to the resulting joint, but there was no leakage at the joint.

Example 2 A joint m-sleeve similar to that in Example 1 was used, and a paste solder mainly composed of Sn powder and flux was applied in the grooves on the inner surface of the sleeve.

On the other hand, one steel pipe with an outer diameter of 8.0φ was used as the connecting pipe material.
A joint was assembled using a shaped steel pipe, so-called teeth, without applying flux, by inserting the joint sleeve at both ends of the pipe material until it touched the solder disk.

Next, as in Example 1, the thermite composition was heated, and as a result, it was confirmed that the melted solder flowed out to both ends of the joint sleeve.

Furthermore, an internal pressure of 25 Ko/cm2 was applied to the resulting joint, but there was no leakage and a full-length joint was obtained.

In the embodiment, a steel pipe was used as the sleeve material, but the material is not limited to steel pipes, but may also be copper alloy pipes, aluminum pipes, or aluminum alloy pipes.

Application to steel pipes, stainless steel pipes, titanium pipes, etc. is also possible. The brazing material can be selected as appropriate depending on the pipe material to be joined and the purpose of use. For example, 3n-1) b addition m, 5
n-A(] system 21', Pb-A.

system? It can also be applied to 1', Cu-Aq brazing filler metal, C'', u-711 brazing filler metal, and Gu-P brazing filler metal.
The shape of the brazing material is not limited to a disk, but may also be a ring or a wire. Also, the shape of the heating element I>
The shape is not limited to a vertically divided shape, but a cylindrical shape that can come into contact with the outer circumferential surface of the joint sleeve and that allows the divided shapes to come into contact with each other may also be used.

In some cases, the powder-like exothermic substance may be placed in the case as it is, and the entire case may be heated.

Moreover, instead of using a thermite heating element as a heating source, the conventionally widely used electric heater or torch heating can be used.

[Effects of the Invention 1 J of I-I-: Sea urchin The present invention has the advantage that if a groove for a capillary tube is provided on the inner surface of the sea urchin, [1 To ensure that the filler metal penetrates between the sleeve 1 and the pipe material to be connected, and to ensure that the inside of the sleeve is filled by checking the fill of solder metal at the end of the sleeve, thereby obtaining a reliable joint. I can do it. ' The required amount of brazing material varies depending on the quality of the sleeve, but according to the present invention, it can be increased or decreased as appropriate, and the amount of brazing material can always be maintained at an appropriate amount.

In addition, by fitting the fitting sleeve over the pipes to be connected, connections between straight pipes, straight pipes and J LeBeau, Tees, Reso's, screw adapters, unions, etc. can all be joined with the fitting sleeve. It has a wide range of applications.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional explanatory view showing an assembled state of a joint part in an example of the method according to the present invention, FIG. 2 is a longitudinal cross-sectional view showing an example of a joint sleeve to be used, FIG. 3 is a side view thereof, and FIG. The figure shows another example of the groove shape formed on the inner surface of the sleeve.
FIG. 5 is an explanatory view showing an example of a method of fixing the brazing material within the sleeve, and FIG. 6 is a sectional view showing the state of the example of FIG. 1 after brazing. FIG. 7 is an explanatory cross-sectional view showing another example of the present invention. 1...1(,1'- sleeve, 2...fine <
i vortex. 3... [-One Shrine Disc, /I, 5 and 51...
- Pipe materials to be connected, 6... heating element, 7 and 8... punch. 9...Flutter or flux and 1] lumber powder. 4 Figure '45 Figure opening - 7 6 Display of Figure 111 A'1 Showa 5) 9 Special Edition 8' [Application No. 2153
84 Month 2 Name of the invention 6 Method for connecting metal pipes to metal sleeves 3 Supplementary 4 Agency for the Ministry 〒100 6 Column for the title of the invention and details of the invention for the specification subject to amendment <tifJ light column 7 Contents of the amendment (1. Change the name of the invention to [Metal tube J, all metal pipe (A connection/'J method 1 and 811.

Claims (7)

[Claims] (1) In a method of connecting two pipe materials, at least one of which is an elbow, teeth, reducer screw adapter, or union, using a coupling sleeve, the suction action due to capillary action is applied to the inner surface. Providing multiple continuous grooves in the longitudinal direction that cause
In addition, by using a coupling sleeve in which sufficient brazing material is positioned approximately in the center of the interior to fill the gap between the inner surface of the sleeve and the pipe material to be connected, the end of the pipe material to which the coupling sleeve is to be connected is used. Assemble the joint by fitting it into the
A method for connecting metal pipe materials, which comprises heating from the outer periphery of the joint sleeve of the assembled joint portion to melt the brazing material and brazing the joint sleeve and the pipe material to be connected. (2) A method according to item 1 above, characterized in that the ends of the two pipes to be connected have substantially the same outer diameter. (3) In any of the methods described in paragraphs 1 to 3 above, a self-heating device equipped with a thermite reaction mechanism that is preformed so as to have a substantially cylindrical shape when attached to the outer periphery of the joint sleeve. A method characterized in that after the self-heating agent is installed, the self-heating agent is ignited and the sleeve for the joint is heated by the thermite reaction heat of the exothermic agent. (4) In any of the methods described in Items 1 to 4 above, a paste-like flux or a paste-like mixture of flux and a powder of the same quality as the brazing material used for connection is applied to the inner groove. A method characterized by using a sleeve for a joint. (5) The method according to any one of items 1 to 5 above, characterized in that the material of the tube material is Cu, Al, Fe, Ti, stainless steel, or an alloy containing one of these as a main component. How to do it. (6) In any of the methods described in paragraphs 1 to 6 above, the brazing material is Sn, Pb, Zn, Ni, Al, Ag.
, Cu, and an alloy containing one or more of these as main components. (7) In any of the methods described in Items 1 to 7 above, the flow direction of the brazing material melted by heating is from the end of the pipe material to be connected to the end of the joint sleeve. how to.