JPS6122429B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting a stranded conductor formed by twisting a plurality of thin conductive wires together.

The lead conductor that connects the end of a high-voltage winding and an external connection terminal in a large-capacity power transformer or the like generally needs to have sufficient flexibility from the viewpoint of workability. Therefore, as the conductor, a composite stranded wire conductor is used, which is formed by twisting together a plurality of thin conductive wires made of annealed copper, and further twisting a plurality of bare stranded wires. This composite stranded wire conductor and other conductors (e.g.
The method of connecting the composite stranded wire conductor and the other conductor (winding ends) was to overlap the composite stranded wire conductor and other conductors to a length necessary for connection, and to connect them by silver brazing. However, in this case, in order to prevent the stranded wires from unraveling, it is necessary to uniformly melt, infiltrate, and solidify the brazing filler metal into the gaps between the strands of wire and between both conductors, which requires great skill. There was a problem with this. Further, since the composite stranded wire conductor has a circular cross section, the contact area at the joint tends to be small, and the joint has a drawback that the tensile strength or mechanical strength of the joint is low.

An object of the present invention is to provide a method for connecting stranded wire conductors that can be easily, reliably, and firmly connected without requiring any skill like ordinary conductors.

Hereinafter, a specific example of the connection method of the present invention will be explained in detail with reference to the drawings. 1 to 3 show an example of the connection method according to the present invention. Plain twisted wire 1 formed by twisting multiple thin annealed copper conductive wires together
A composite stranded wire conductor 2 formed by further twisting a plurality of
In order to connect another electrical conductor 7, for example, a rectangular copper wire such as the end of a transformer winding, first, a press-wound conductor 3 is tightly wound at several points on the outer circumference of the tip of the composite stranded conductor 2, and the composite stranded conductor 3 is twisted. This prevents the ends of the wire conductor 2 from unraveling. It is preferable to use a single thin conducting wire made of the same material as the composite stranded wire conductor 2 as the holding winding conducting wire 3. Furthermore, a thin band-shaped conductor may be used as the holding wire 3 instead of a thin conductive wire, but in any case, it must be capable of compression molding.

After winding the holding winding conductor 3 around the outer circumference of the tip of the composite stranded conductor 2, the tip of the composite stranded conductor 2 is
Compression molding is performed using molding dies 4 and 5 shown in the figure so that the cross section has a substantially rectangular shape as shown in FIG.
A flat processed part 2A is obtained. The shaping dies 4 and 5 have one die 4 having a concave shape and the other die 5 having a convex shape in order to make the tip of the composite stranded wire conductor 2 rectangular.

〓〓〓〓〓
Next, the flat processed portion 2A of the composite stranded wire conductor 2 is heated to form a stranded wire, and a brazing material 6 is applied between the bare strands 1.
The composite stranded wire conductor 2 is formed into the same shape as a general conductor (for example, a rectangular copper wire) by melting and injecting it or dipping it in a melted brazing material to harden the spaces between the bare strands 1.

In general, the composite stranded wire conductor 2 easily unravels, so it is difficult to hold it in a predetermined shape even if it is compressed. After molding, the strands can be prevented from unraveling.

The flat processed portion 2A of the composite stranded conductor 2 pretreated in this way is superimposed on the connecting end of the other conductor 7 to be connected as shown in FIG. 3, and a foil brazing material is placed between the two. 8 interposed therebetween, and then this overlapping portion 9 is sandwiched between carbon electrodes 10 and 11, and the overlapping portion 9 is heated by applying electricity between the two electrodes 10 and 11 from the power source 12, and the overlapping portion 9 is heated. The interposed brazing filler metal 8 and the brazing filler metal 6 infiltrated into the flat processed portion 2A are melted to connect the composite stranded wire conductor 2 and the other conductor 7.

Although the conductors to be connected in the above embodiments were not coated with insulation, the present invention is not limited thereto. The connection can be made in the same way by removing only the length.

Further, according to the method for connecting a stranded wire conductor according to the present invention, connection with another conductor 7 having an arbitrary shape as shown in FIGS. 4 to 8 can be easily performed.

Figure 4 shows an example of the connection between the pretreated stranded conductor 2 and the rectangular copper wire (winding conductor) ₇₁ , and Figure 5 shows the stranded conductor 2 that has been pretreated and the stranded conductor 2 that has also been pretreated. Fig. 6 shows an example of the connection between the pretreated stranded conductor ₂ and the copper plate _73.
Figure 7 shows an example of the connection between the pretreated stranded conductor 2 and the copper round bar ₇₄ whose connection end is pressed and flattened. An example of the connection between the treated stranded wire conductor 2 and a copper round bar ₇₅ whose connection end side has been cut and made flat is shown.

As explained above, in the method for connecting stranded wire conductors according to the present invention, a presser winding is applied to the tip of the stranded wire conductor to be connected, and this portion is compression-molded to obtain a flat processed portion. After pre-treatment to infiltrate the solder metal into the brazing material, it is connected to other conductors by brazing, so it can be easily and quickly and efficiently strengthened in the same way as connecting ordinary conductors such as rectangular copper wire. Can be connected. Further, according to the present invention, good connection results can be obtained without requiring any skill even with twisted wire conductors. Furthermore, in the present invention, since the tips of the stranded wire conductors are formed into a flat shape, the overlapping area of the connection part is large, so that the connection can be made securely, and the tensile strength or mechanical strength of the connection part can be improved. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a stranded conductor before being pretreated by the connection method of the present invention, Fig. 2 is a perspective view of a stranded conductor pretreated by the connection method of the present invention, and Fig. 3 1 is a sectional view of a stranded conductor being connected to another conductor by the connection method of the present invention, and FIGS. 4 to 8 are perspective views of various conductors connected to a stranded conductor by the connection method of the present invention. It is a diagram. 2...Twisted wire conductor, 2A...Flat processed part, 3...
Holder winding conductor wire, 4, 5...Dice, 6...Brazing material, 7...Other conductor, 8...Brazing material, 9...Overlapping portion, 10, 11...Electrode. 〓〓〓〓〓

Claims (1)

[Claims] 1. In a stranded conductor connection method for connecting a stranded conductor to another conductor, a press-wound conductor is wound around the tip of the stranded conductor, and then this part is compression molded to obtain a flat processed part, and the stranded conductor is A brazing metal is infiltrated into this flat processed part and solidified, and then this flat processed part and another conductor to be connected are overlapped via the soldering metal, and electricity is applied while this overlapped part is held between electrodes. A method for connecting a stranded wire conductor, characterized in that the stranded wire conductor and another conductor are connected by heating to melt the brazing material and connect the stranded wire conductor to another conductor.