JPS5919611B2 - Manufacturing method of copper oxide film stranded wire conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a copper oxide film on the surface of each strand of a stranded conductor of a power cable, particularly a split conductor, by a chemical oxidation method.

Segmented conductors are generally compression molded. Therefore, the distance between the strands is very narrow. It is difficult to uniformly oxidize the internal wires by simply immersing them in an oxidizing solution. The present invention has the following features: (1) pressurizing the oxidizing solution; (2) preheating the stranded wire immediately before putting it into the oxidizing solution; (3) uniformly oxidizing the strands to the inside; This makes it possible to shorten the length of the wire (or speed up the stranding).

Example “Figure 1” shows an outline of the device.

10 is a copper stranded wire, for example a pressure wire formed segmented conductor.

12 is its direction of travel.

14 seems to be preheating.

A preheating device 16 (for example, a high frequency induction heating device 18) is installed inside.
etc.). Moreover, the inside is kept in an inert state by steam 20 or the like. 22 seems to be oxidized, so preheat it 1
It is located adjacent to 4.

24 is an oxidizing liquid.

For example, with each 5% aqueous solution of NaCi02 + NaOH, 9
Maintained at 0-100℃, 0.2-1.0kg/CliL
is pressurized. 26 is a seal, 28 is an oxidizing liquid tank,
30 is a pressurized circulation pump.

32 is likely to receive liquid, and the internal pressure is maintained at normal pressure.

The working strand 10 is heated at a temperature of 150 to 200 within the preheating tank 14.
It is preheated to 0.degree. C. and immediately enters the oxidation treatment chamber 22.

The oxidizing liquid 24 is pressurized within the oxidizing chamber 22 .

Further, the pressure in the inner layer of the stranded wire 10 is lower than that of the oxidizing solution. Therefore, the oxidizing liquid 24 penetrates into the stranded wire 10, flows through its inner layer in the axial direction, and is blown out on both sides of the oxidizing tube 22. The oxidizing liquid blown out into the liquid receiver 32 is collected into the tank 28. They have no special function in the present invention. (1)
The state of oxidation of the inner layer of stranded wire 10.

A portion of the oxidizing liquid 24 blown out toward the preheating device 14 comes out onto the surface of the stranded wire 10 and falls, but a portion reaches the vicinity of the preheating device 16 through the inner layer of the stranded wire 10.

FIG. 2 shows an example of the relationship between the penetration length l (distance from the seal 26) of the oxidizing liquid 24 and the pressure of the oxidizing liquid 24.

Therefore, the strands of the inner layer of the stranded wire 10 come into contact with the oxidizing liquid 24 even before the stranded wire 10 enters the oxidation treatment chamber 22.

At the same time, the oxidation reaction begins. Moreover, at that time, the strands of the inner layer of the twisted wire 10 are 1) kept at a high temperature by the preheating device 16, and 2) are constantly in contact with the flow of the high-temperature oxidizing liquid 24 blown out, so that the oxidation reaction occurs rapidly. And it is progressing steadily. This situation is shown by the A curve at the top of "Figure 1."

Note that the vertical axis represents the thickness of the produced copper oxide film. The oxidation reaction of the inner layer of the stranded wire 10 is almost completed before it is placed in the oxidation treatment chamber 22, and within the oxidation treatment chamber 22 it is only finished. (2) How the outer layer of the stranded wire 10 is oxidized.

It is shown in the upper part of "Figure 1" by the B curve.

Since some oxidizing liquid comes out through the inner layer of the stranded wire 10 to the outer layer and some oxidizing liquid leaks from the seal, the outer layer of the stranded wire 10 also comes into contact with the oxidizing liquid 24 a little before entering the oxidation treatment chamber 22. Therefore, the oxidation reaction progresses slightly even within the preheating chamber 14. However, most of the oxidation of the outer layers of the stranded wire 10 takes place within the oxidation chamber 22. In the vicinity of the exit of the oxidation processing chamber 22, the oxidation of both the inner and outer layers is completed almost simultaneously. As shown in FIG. 3, which assumes that there is no preheating device 16, oxidation of both the outer layer and the inner layer begins when the oxidation process 4-22 begins.

The outer layer B progresses only slightly more slowly than in the above case. However, the progress of oxidation in the inner layer A is extremely slow.

Even at the exit of the oxidation process 22, the oxidation is not completed. Therefore, in order to completely oxidize the inner layer, it is necessary to make the oxidizing groove 22 longer or to slow down the speed of the stranded wire 10.

Effects of the Invention (1) As described above, 1) The copper stranded wire conductor 10 penetrates the side wall of the oxidation treatment chamber 22 filled with the oxidation liquid 24 and enters the inside while continuously traveling in the horizontal direction. In addition, the side wall of the oxidizing solution 24 is penetrated to the outside of the oxidizing treatment tank 22, while the oxidizing solution 24
1) to form a film of copper oxide on the surface of the strands by chemical oxidation, and 2) to pressurize the oxidizing liquid 24. However, the pressure becomes lower than the pressure of the oxidizing liquid 24.

This is because inside the stranded wire conductor 10, there is a gap between the strands that continues in the length direction, which extends to the outside of the oxidation treatment tube 22, and the outside of the oxidation treatment tube 22 is at atmospheric pressure. be. Therefore, in the oxidizing tube 22, the oxidizing liquid 24 enters the inner layer of the stranded conductor 10 without being hindered by the air within the stranded conductor 10, and runs laterally through the strand gaps. In other words, the inside of the stranded wire conductor 10 before entering the oxidation treatment chamber 22 contains (
(As shown in FIG. 2, the higher the hydraulic pressure, the longer the section) The oxidizing liquid 24 will blow out. (2) Then, just before the stranded wire conductor 10 enters the oxidation treatment step 22, the stranded wire conductor 10 is preheated in an inert air. Inside the stranded wire conductor 10, oxidation of the surface of the strands proceeds rapidly and reliably over a considerably long period.

Furthermore, since the heating is performed in an inert atmosphere, there is no fear that a film of cuprous oxide will be formed first, and that it will not interfere with the formation of cupric oxide. Generally, the inside of the stranded wire conductor 10 (especially when compression molded) contains an oxidizing liquid 2.
4 is difficult to penetrate. In order to fully oxidize the internal wires, it is necessary to increase the contact time between the stranded wire conductor 10 and the oxidizing liquid 24, that is, to increase the length of the oxidation treatment 22, or to increase the running speed of the stranded wire conductor 10. You need to slow down or something. However, in the present invention, as described above, the oxidation reaction in the inner layer of the stranded conductor 10 is almost completed before entering the oxidation treatment chamber 22, so the length of the oxidation treatment layer 22 is short. Also, or stranded conductor 1
Even if the 0 speed is high, uniform oxidation treatment can be performed to the inner layers of the stranded wire conductor 10.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the apparatus used to carry out the present invention.
Above it, the formation process of the copper oxide film is also written. FIG. 2 is a diagram showing the relationship between the pressure of the oxidizing liquid 24 and the length of penetration into the stranded wire 10. FIG. 3 is an explanatory diagram of the process of forming a copper oxide film assuming that there is no preheating device 16. 10...
- Stranded wire, 16... Preheating device, 22...
・Oxidation treatment Yes, 24... Oxidizing liquid.

Claims (1)

[Claims] 1. A copper stranded wire conductor 10 is continuously passed through an oxidizing solution 24 in an oxidation treatment chamber 22, and a copper oxide film is formed on the surface of the wire by a chemical oxidation method. In the manufacturing method, the copper stranded wire conductor 10 penetrates the side wall of the oxidation treatment chamber 22 filled with the oxidizing solution 24 while continuously running in the horizontal direction, and penetrates the side wall and undergoes oxidation. A stranded wire coated with a copper oxide film, characterized in that the oxidizing liquid 24 is pressurized so that it exits the processing chamber 22, and the stranded wire conductor 10 is preheated immediately before entering the oxidation processing chamber 22. Method of manufacturing conductors.