JPS628091Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transposed electric wire formed by winding insulating paper in multiple layers on a transposed conductor which is made by twisting an odd number of rectangular insulated wires while displacing them at a constant dislocation pitch.

For transposed electric wires, the technical challenge is to minimize the increase in size after twisting together an odd number of rectangular insulated strands, which are the strands of transposed conductors, and to improve the finished outer diameter dimensional accuracy. . For this purpose, (1) Japanese Utility Model Application Publication No. 55-42308 proposes a transposed electric wire in which a plastic film or plastic woven cloth with good oil resistance is wound around a transposed conductor; 48-95169 proposes a transposed electric wire in which an insulating string, such as a nylon thread and a glass thread, is wound around a transposed conductor. In these conventional techniques, the film, woven fabric, or string is wound around the transposed conductor under strong tension and tightened to reduce the dimensional increase, so the film, nonwoven fabric, or string used must have tensile strength. Moreover, since it is necessary to increase the thickness or increase the number of pieces, there is a drawback that the finished size cannot be effectively reduced. Moreover, implementing these techniques has the disadvantage that a device capable of winding at high tension is required.

The object of the present invention is not to have the above-mentioned drawbacks,
The purpose of the present invention is to obtain a transposed electric wire in which the size increase after twisting transposed conductor strands is reduced and the finished outer diameter dimensional accuracy is improved.

The invention will now be explained by way of example with reference to the drawings.

As shown in FIG. 1, the present invention is to place a heat-shrinkable film 3 with good oil resistance on a transposed conductor 1 made by twisting an odd number of rectangular insulating wires 2 while displacing them at a constant dislocation pitch. , is wound in the form of a tape with an appropriate gap G, and is heat-shrinked to tighten the conductor 1 uniformly, and then an insulating paper 4 is wound multiple times on top of this to make a transposed electric wire. be.

The transposed electric wire of the present invention includes a heat-shrinkable film wound on the transposed conductor at appropriate intervals, and the film is heat-shrinked to tightly and uniformly tighten the conductor, which is different from the known prior art. The dimensional accuracy is improved and the strength is also improved compared to the transposed electric wire obtained by the method. In addition, since the film is heat-shrinkable, the tensile strength during film winding is not required as in the conventional technology, and the thickness of the film winding layer can be made thinner, effectively reducing the finished dimensions of the transposed wire. be able to.

In order to manufacture the transposed electric wire of the present invention, as shown in FIG. are drawn out and arranged in upper and lower layers, and these strands 2 are transposed and aligned at an appropriate dislocation pitch of 80 to 300 mm in a dislocation device 12 to obtain a transposed conductor 1. Next, a tape-shaped heat-shrinkable film 3 with good oil resistance (for example, a polyethylene-based heat-shrinkable tape with a thickness of 25 to 50 μm and a width of 10 to 20 mm) is placed on the dislocation conductor 1 using the tape winding device 13. It is wound with an appropriate tension at an appropriate gap G (for example, 1 to 10 mm). Next, the heating temperature is set to 100, for example.
When the heat-shrinkable film 3 is heat-shrinked by heating with a heating furnace or hot air generator 14 maintained at a temperature of ~150° C., the transposed conductor 1 is uniformly tightened by the shrinkage of the film 3. Next, a predetermined number of sheets of insulating paper 4 are wound on this using the insulating paper wrapping device 15, and the finished transposed wire 5 is transferred to the pulling device 1.
6, and a winding device 17 winds it onto a predetermined drum.

As mentioned above, the present invention includes a heat-shrinkable film wound around the transposed conductor, and this film uniformly tightens the transposed conductor through heat shrinkage treatment, thereby improving the finished dimensional accuracy of the transposed electric wire. and strength. Therefore, by using the transposed wire of the present invention, the coil itself can be made compact, and by using this coil, transformers, shunt reactors, etc. can be made compact, and the electromagnetic mechanical force generated during short circuits can be made compact. It is possible to provide an electric wire that is strong against mechanical stress on the electric wire.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing the inside of an example of the transposed electric wire of the present invention, and FIG. 2 is a schematic side view showing the arrangement of an example of the transposed electric wire manufacturing apparatus of the present invention. 1...Transposed conductor, 2...Rectangular insulated wire, 3...
Heat-shrinkable film, 4... Insulating paper, G... Gap, 5... Transposed electric wire, 11... Element wire supply device, 1
2...Transposition device, 13...Film winding device, 1
4... Heating furnace or hot air generator, 15... Insulating paper wrapping device, 16... Taking-up device, 17... Winding device.

Claims (1)

[Scope of Claim for Utility Model Registration] A transposed electric wire formed by multiple windings of insulating paper on a transposed conductor made by twisting an odd number of rectangular insulated wires while transposing them at a certain dislocation pitch, the transposed conductor and the insulation. A transposed electric wire characterized in that a heat-shrinkable film with good oil resistance is wound between the paper and the heat-shrinkable film is heated and shrunk to provide a layer in which the conductor is uniformly tightened.