JPH078432B2 - How to connect pipes - Google Patents

Description

The present invention relates to a method for connecting pipes.

[Conventional technology]

For example, in a hermetically sealed contact device in which electrical contacts that come into contact with and separate from each other in a hermetically sealed space are arranged in a hermetically sealed container, a pipe for exhausting gas inside the container is used as a container (or a member constituting the container) during manufacturing. There is a process of connecting.

Conventionally, pipes are connected as follows.

First, as shown in FIG. 5, each member of the pipe 22, the cap-shaped joint member 23, and the washer-shaped brazing filler metals 24, 25 is connected to a pipe-connected member (container or container by using a jig (not shown)). Member) 21 to be combined. The combination is such that the peripheral edge 23b of the joint member 23 faces the pipe connected member 21 in a state where the pipe 22 is inserted into the central hole 23a of the joint member 23, and the pipe 22 and the joint member of the pipe connected member 21. Brazing materials 24 and 25 are placed at joints A and B with respect to 23, respectively. In this state, the brazing materials 24 and 25 are melted by heating together with the jig, the joints A and B are brazed, and the pipe 22 is connected.

[Problems to be Solved by the Invention]

However, in this method, the brazing filler metal 25 is applied to the periphery of the joint member 23.
It is extremely difficult to accurately align with the predetermined position of 23b,
There are inconveniences such as long manufacturing time and mistakes in brazing.

In addition, the above-mentioned method, each member to the pipe connected member 21
It takes time to combine 22 to 25 and the work efficiency of combination is poor.

In view of the above circumstances, the present invention provides a pipe connecting method in which the brazing material is extremely easily aligned, and a pipe connecting method capable of efficiently combining the respective members with the pipe connected member. And

[Means for Solving the Problems]

In order to solve the above-mentioned problems, in the pipe connecting method according to claim 1 or 2, the brazing filler metal placed at both joints is integrated and fitted into the joint member. To

In the pipe connecting method according to claim 2, in addition, before brazing, the brazing material is fitted to the joining member, and the pipe and the joining member are inserted in advance in a state in which one end of the pipe is inserted into the central hole of the joining member. The pipe, the joint member, and the brazing material are temporarily fixed so that the peripheral edge of the joint member faces the pipe connected member.

[Action]

If the brazing material is fitted to the joint member, the brazing material is arranged at both joints and the positioning is naturally performed. Since the shape of the brazing filler metal is such that the brazing filler metal fits exactly inside the joint member, the positioning can be performed only by fitting them together.

If the brazing material is fitted to the joint member and the pipe and the joint member are temporarily fixed in advance with one end of the pipe inserted into the central hole of the joint member, the three members are integrated into a block body,
After that, since the block body is simply directed to the pipe connected member at the periphery of the joint member, the work of combining the members with the pipe connected member can be performed extremely efficiently.

〔Example〕

An embodiment of the pipe connecting method according to the present invention will be described below.
A detailed description will be given with reference to the drawings.

FIG. 1 shows a state immediately before brazing in which the respective members 2 to 4 are combined with the container member (pipe connected member) 1 of the hermetic contact device in the first embodiment of the pipe connecting method of the present invention. FIG. 2 shows the container member 1 and each member 2
Disassemble and represent 4.

In the first embodiment, before combination, the metal pipe 2, the cap-shaped joint member (for example, metal) 3 and the brazing material 4 are integrated into a block body in advance, and then the container member (for example, metal) 1 is assembled. The peripheral edge 3b of the joint member 3 is made to face to be assembled by a jig (not shown).

The block body itself is formed as follows.

First, the brazing material 4 having a shape along the inner surface of the joint member (flange member) 3 is fitted. As shown in FIG. 1, the brazing material 4 is formed into a cap shape just along the inside of the joint member 3. This means that the brazing material 4 can be placed in both the joints A and B in a precisely positioned state.

Next, the pipe 2 is inserted from the wide mouth side of the joint member 3 (pipe outer shape r ₁ <center hole 3a diameter r ₂ ), and the brazing material 4 is sandwiched between the head 2a of the pipe 2 and the inner surface of the joint member 3 (outer diameter r of the head 2a ₂ > central hole 3a diameter r ₂ ). Then, the neck 2b of the pipe is expanded (expanded) and brought into pressure contact with the central hole 3a. The pipe 2 is in the state shown by the one-dot chain line before the pipe is expanded, but is in the state shown by the solid line after the pipe is expanded. Then, the head 2a of the pipe 2 presses the brazing material 4, while the pipe 2 and the joint member 3 are also temporarily fixed, so that these three members alone form one block body. From this point on, it can be handled efficiently as a single block so that work can proceed efficiently.

This block body is combined with the container member 1 using a jig, and the jig and all are heated to melt the brazing material 4 to braze the joints A and B. If the jig is removed, the connection of the pipe 2 is completed.

FIG. 3 shows a state immediately before brazing in which the pipe connected member 1'is combined with the respective members 2'-4 'in the second embodiment of the pipe connecting method of the present invention.

Also in the second embodiment, before the combination, the pipe (for example, made of metal) 2 ′ and the cap-shaped joint member (for example, made of metal) 3 ′ are used.
Then, the brazing material 4'is integrated in advance to form a block body, and then the pipe connected member (for example, made of metal) 1'is joined by a jig with the peripheral edge 3'b of the joint member 3'facing.

In the second embodiment, the projections 2'a and 2'a at the end of the pipe 2'are provided.
A block body is formed by sandwiching the edge of the central hole 3'of the joint member 3'and the edge of the brazing material 4 '.

After this, the work is carried out in the same manner as in the above-mentioned embodiment.

FIG. 4 shows a state immediately before brazing in which the respective members 2 ″ to 4 ″ are combined with the pipe connected member 1 ″ in the third embodiment of the pipe connecting method of the present invention.

Also in the third embodiment, before combination, a pipe (for example, made of metal) 2 ″ and a cap-shaped joint member (for example, made of metal) 3 ″ are combined.
The brazing material 4 ″ is previously integrated into a block body, and then the pipe connected member (for example, made of metal) 1 ″ is combined with a jig by facing the peripheral edge 3 ″ b of the joint member 3 ″.

In the third embodiment, the outer diameter of the pipe 2 ″ is slightly larger than the diameter of the central hole 3 ″ a and the central hole 4 ″ a of the brazing material 4 ″ before forming the block, and the joint member 3 ″ is formed. Ni wax 4 "
And press fit, shrink fit,
Alternatively, the pipe 2 ″ and the central hole 3 ″ a are inserted so as to come into pressure contact with each other by cold fitting or the like, and temporarily fixed, and the three members are made into a block body.

From this point onward, the process is performed in the same manner as in the above embodiment.

In each of the above-mentioned embodiments, the block body is constituted by the three members of the pipe, the joint member and the brazing material without using any other parts, and the block body is constituted only by the mechanical connection of the three members, which is a very preferable mode. However, this is not the only option,
The person may be blocked. Not only that, the brazing filler metal and the pipe are kept in good contact, and in the conventional method, it was necessary to pull the pipe in order to keep the washer-shaped brazing filler metal and the pipe in contact with each other. , That's not necessary.

In each of the above-mentioned embodiments, the joint member was used for the purpose of expanding the diameter of the pipe, but in addition to this, when it is difficult to braze the pipe connected member directly to the pipe, A mode in which a joint member having good properties is used for cushioning may be used.

Although each member is made of metal as an example, part or all of the member may be made of other material such as ceramic.

It goes without saying that this pipe connecting method may be used for connecting pipes other than the exhaust pipe in the sealed contact device.

〔The invention's effect〕

In the pipe connecting method according to the first and second aspects, since the brazing filler metal is accurately and easily positioned, the manufacturing process is easy, the brazing error is small, and the yield is improved.

The pipe connecting method according to claim 2,
Since the work can be performed by using the joint member and the brazing material as one block body, the efficiency of the combination work for the pipe connected members is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state of main members immediately before brazing when connecting pipes in a first embodiment of the method of the present invention, and FIG. 2 is a perspective view showing disassembled members. 3 and 4 are sectional views showing the states of the main members immediately before brazing when connecting pipes in the second and third embodiments of the method of the present invention, and FIG. 5 is a conventional method. FIG. 6 is a cross-sectional view showing a state of a main member immediately before brazing when connecting pipes with each other. 1, 1 ', 1 "... Pipe connected member, 2, 2', 2"
... pipes, 3 ', 3' ... joint members, 3a, 3'a,
3 ″ a ... center hole, 3b, 3′b, 3 ″ b ... periphery 4,
4 ', 4 "... brazing material, A, B ... joint

Claims (2)

[Claims] 1. A pipe is inserted into a center hole of a cap-shaped joint member, and a peripheral edge of the joint member is directed toward a pipe connected member, and the pipe and the pipe connected member are placed at a joint portion with the joint member. A method of connecting pipes, wherein the pipes are connected to the pipe connected member by brazing the joints with the brazed material, wherein the brazing materials placed on both the joints are integrated as the brazing material. A method for connecting pipes, characterized in that a pipe having a shape that fits into the joint member is used. 2. Prior to brazing, the brazing material is fitted to the joining member, and the pipe, the joining member and the pipe are jointed with one end of the pipe inserted into the central hole of the joining member. The pipe connecting method according to claim 1, wherein the pipe is connected to the pipe connected member so that the peripheral edge of the connecting member faces the pipe connected member.