JPS5834885B2 - Manufacturing method of copper oxide film wire insulated conductor - 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 copper oxide film (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 insulates the strands by forming copper oxide only on the outer layer of the copper stranded wire (including the segments), thereby achieving almost the same effect as when an insulating film is provided on all the strands. A method of manufacturing an insulated conductor is provided.

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

SUMMARY OF THE INVENTION Dog-sized cable conductor segments, which are typically compression molded, when immersed in an oxidizing solution,
It takes some time for the oxidation treatment solution to penetrate into the inner layer.

Therefore, by tightening the twist pitch of the copper strands even more, the gaps between the strands become very small, making it more difficult for the oxidizing solution to penetrate.

Therefore, if the tightness of the twist pitch of the copper stranded wire and the time for the copper stranded wire to pass through the oxidation treatment solution are appropriately determined, the oxidation treatment solution will penetrate only into the outer layer of the copper stranded wire. The copper strands can be allowed to emerge from the oxidation process while not otherwise penetrating into the interior.

The present invention utilizes the above points to form a copper oxide film only on the outer layer portion.

Embodiment (FIGS. 1 and 2) Reference numeral 10 is a copper stranded wire made by twisting copper wires, and is, for example, a compression molded segment.

12 indicates oxidation treatment, and oxidation treatment liquid 14 is used. Oxidation treatment liquid 14 is, for example, 5% sodium chlorate
% hydroxide) A mixed aqueous solution of IJum is used.

16 is a take-up caterpillar that feeds the copper stranded wire 10 in the direction of arrow 18.

20 is an electric motor, 22 is a reduction gear, 24 is a line shaft,
26 is a clutch, 28 is a speed reducer, and 30A and 30B are twisting devices, which have an eye structure (Fig. 2).

32 is its casing, 34 is a bearing, 36 is a rotating ring, and 38 is a guide roll.

It rotates freely and is supported by, for example, three pieces of copper stranded wire.

Reference numeral 40 indicates a foot (not shown in FIG. 1) for mounting them.

42 is a sprocket, 44 is a torque limiter, and 46A and 46B are clutches.

The working copper stranded wire 10 is pre-treated by degreasing and cleaning the surface of each strand with a torne el, dolchloroethane, caustic soda aqueous solution, etc., and then the compression molded segment is twisted.

Therefore, when both the twist tightening devices 30A and 130B are left free and the copper stranded wire 10 is advanced at a constant speed, the upward tightening devices 30A and 30B will move loosely in the direction of the twist at the twist speed due to the above twist. Rotate.

Therefore, this rotation and eye rotation are transmitted from the electric motor 20 to the line shaft 24, etc., and tightened by the device 30A.
, B, there is no change in the twist pitch of the copper stranded wire 10.

Therefore, (1) Initially, the twisting device 30A1B is given rotation in the same direction at the eye speed as described above.

(2) Next, both clutches 46A1B are disengaged to free both twisting devices 30A and 30H.

(3) Disengage the clutch 26, stop the operation of the take-up caterpillar 16, stop the copper stranded wire 10, and at the same time lock the twist tightening device 30B.

(4) Device 30 that tightens the twist by engaging only the clutch 46A
I'll turn A a little.

Then, since 30B does not rotate, the pitch of the stranded copper wires 10 is tightened between them.

(5) Once the clutch is properly tightened, engage the clutch 46B1 reducer 22 and 1).

Then, the pitch of the stranded copper wire 10 becomes tighter only when it passes through the oxidation treatment chamber 12, and when it leaves the oxidation treatment chamber 12, it returns to its original pitch due to its own elasticity, and is continuously tightened. proceed.

As described above, since the pitch of the copper strands 10 is tightened within the oxidation treatment tube 12, the gaps between the strands become smaller, making it difficult for the oxidation treatment liquid 14 to penetrate.

Therefore, if the oxidizing liquid 14 penetrates only into the outer layer and the copper stranded wire 10 passes through the oxidizing liquid 12 before penetrating into the inner layer, the copper oxide film will be formed only in the outer layer. can be formed.

After the above step, the ladle stranded wire 10 is washed with water to completely remove the oxidation treatment liquid adhering to its surface.

Another Embodiment A stranded copper wire 10 is made from the beginning so that the degree of compression molding is different between the inner layer and the outer layer.

In other words, for the inner layer, the degree of compression molding is made dense rather than thick, so that the gaps between the strands are small from the beginning, and for the outer layer, the degree of compression molding is made small, that is, sparsely, and the gaps between the strands are small from the beginning. Leave a wide space between the lines.

Other than that, do the same as in the above case.

In this way, when the pitch is tightened in the oxidation treatment tube 12, the gap between the wires in the inner layer becomes even narrower, so that the penetration of the oxidation treatment liquid 14 becomes even worse, and the copper oxide is applied only to the outer layer. It becomes easier to form.

It goes without saying that the copper stranded wire 10 may be preheated prior to this step.

Effects of the Invention Since the twist pitch of the copper stranded wire 10 is tightened when passing through the oxidation treatment solution 14 of the oxidation treatment layer 12, the penetration of the oxidation treatment solution 14 into the inner layer becomes poor as described above, and only the outer layer portion is oxidized. It becomes possible to form a copper film.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the present invention, and FIG. 2 is a cross-sectional view taken along line 1--2. 10...Copper stranded wire, 12...Oxidation treatment, 14.
... Oxidation treatment liquid, 16... Pick-up caterpillar, 30A
1B...Tightening device.

Claims (1)

[Claims] 1. A copper oxide coated stranded wire, characterized in that the stranded copper wire is passed through an oxidation treatment solution of an oxidation treatment with the twisted pitch tightened to reduce the gap between the strands. How to manufacture an insulated conductor circle 2 The stranded copper wire is manufactured from the beginning so that the compression molding degree of the inner layer is dense and the compression molding degree of the outer layer part is sparse. A method for producing a copper oxide coated stranded insulated conductor according to item 1.