JPS6250929B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION As power transmission capacity increases and conductor size increases, losses due to skin effect, proximity effect, etc. become a major problem.

Wire insulation is one of the countermeasures against this problem, and it has already been proposed to insulate the wires with a film of copper oxide (see Japanese Patent Laid-Open No. 56-9912, etc.).

A conventionally proposed method is to provide an insulating film on all the wires, but this method has a low loss reduction effect even though the manufacturing cost is high.

Further, when connecting conductors, it is necessary to remove the wire insulation coating, but it is difficult to remove the coating from all the wires. In particular, the inner layer is more difficult to remove.

The present invention provides an insulated wire conductor that insulates the wire by forming copper oxide only on the outer layer of the copper stranded wire (including segments), thereby achieving the same effect as when an insulating film is provided on all the wires. The present invention provides a method for manufacturing.

Note that the term "outer layer" is used to mean the first layer and the second layer from the outer layer with the copper stranded wire or segment.

SUMMARY OF THE INVENTION Let us consider spraying an oxidizing treatment liquid around a stranded copper wire in the form of a spray.

If the spray pressure is very low, the oxidizing solution only wets the surface of the stranded copper wire. Also, if the spray pressure is very strong, the oxidizing solution will penetrate into the center layer of the copper strands.

Therefore, by appropriately controlling the spray pressure, it is possible to wet only the outer layer of the copper stranded wire with the oxidizing solution and form a copper oxide film on that part.

Embodiment (FIG. 1) Reference numeral 10 is a copper stranded wire (including segments) made by twisting copper wires together, and the wire 10 continuously advances in the direction of an arrow 12.

14 is a heating chamber filled with an inert atmosphere, such as water vapor. 16 is a high frequency induction heating device.

18 is an oxidation treatment chamber.

20 is a spray barrel, and the stranded copper wire 10 runs along its center width.

22 is, for example, 5% tetrium chlorite and 5
It consists of a mixed aqueous solution of % sodium hydroxide, etc.
It is heated to about 90 to 100°C by the heater 24.

26 is a pump, and 28 is a pressure control valve.

Function: First, the copper stranded wire 10 is pretreated by degreasing and cleaning the surface of each strand with triene, trichloroethane, caustic soda aqueous solution, or the like. Then, the high-frequency induction heating device 16 heats the stranded copper wire 10, especially its outer layer, to about 120 to 300°C.

Then, the pressure of the oxidizing treatment liquid 22 is controlled by the pressure control valve 28 to a level that only wets the outer layer of the copper stranded wire 10, and is sprayed from the spray barrel 20 to form a copper oxide film only on the outer layer.

Note that the oxidation reaction is not completed while passing through the spray tube 20, and the stranded copper wire 10 is then maintained in the air at a high temperature (about 100°C) to allow the oxidation reaction to proceed and complete. You may also do so.

Alternatively, the stranded copper wire 10 is not heated by the high-frequency induction heating device 16, but the oxidation treatment liquid is sprayed only on the outer layer of the stranded copper wire 10 using the spray tube 20, and then heated by the high-frequency induction heating device 16. It is also possible to accelerate the oxidation reaction.

After the above step, the copper stranded wire 10 is washed with water to completely remove the oxidation treatment liquid adhering to the surface of each strand.

Effects of the Invention Since the oxidation treatment liquid 22 is sprayed around the copper stranded wire 10, compared to immersing it in the oxidation treatment liquid 22, the spraying time can be shortened by adjusting the spray pressure appropriately. Even if it becomes a little longer, the oxidation treatment liquid 22 will not penetrate into the inner layer of the copper stranded wire 10.

Therefore, compared to immersion in the oxidation treatment liquid 22, the reaction becomes easier.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention. 10: Copper stranded wire, 16: High frequency induction heating device,
18: Oxidation treatment chamber, 20: Spray barrel, 22: Oxidation treatment liquid, 28: Pressure control valve.

Claims (1)

[Claims] 1. By spraying an oxidizing solution from around the stranded copper wire and controlling the pressure of the spray, only the outer layer of the stranded copper wire is wetted with the oxidizing solution, and A method for producing a copper oxide film-coated wire insulated conductor, characterized in that a copper oxide film is formed only on portions of the copper oxide film.