JP2019139970A - Insulated wire - Google Patents

Abstract

To obtain an insulated wire that can ensure practical strength even when reduced in diameter.SOLUTION: An insulated wire 1 has a conductor 10, and an insulation coating layer 20 that coats the conductor 10, and the insulation coating layer 20 is composed of synthetic silica glass that coats the whole of the conductor 10 excluding an exposed edge of it, in a sealing state.SELECTED DRAWING: Figure 1

Description

  The present invention particularly relates to an insulated wire having a sufficient strength even if it has a small diameter.

  Due to the trend toward miniaturization and weight reduction with the development of industrial technology in modern times, the diameter of insulated wires is required to be reduced. Specifically, for example, the diameter (φ) is reduced to 0.5 mm or less. There is a need for insulated wires.

  A general insulated wire is composed of a conductive conductor and an insulating coating made of an insulating resin and covering the conductor. When an insulated wire composed of such a conductor and an insulation coating is thinned to the above-mentioned diameter, the conductor becomes thin and the thickness of the insulation coating composed of an insulating resin is reduced. Strength decreases.

  If an external force is applied to the insulated wire whose strength has been reduced, the conductor may be disconnected, or the insulating coating may be damaged to expose the conductor. If the insulating coating is damaged in this way, not only the insulating performance cannot be secured, but the conductor may be exposed and corroded.

Therefore, even if it is an insulated electric wire reduced in diameter (hereinafter referred to as a thin-diameter electric wire), strength that can sufficiently withstand use, that is, practical strength is required.
Furthermore, in addition to reducing the resistance of conductors, thin wires have a high demand for preventing deterioration of conductors such as insulation under heating conditions, that is, heat resistance insulation.

For example, Patent Document 1 discloses an electric wire in which a glass insulating layer is provided on the surface of a conductor, although the manufacturing method is not clear.
Patent Document 2 discloses an electric wire manufactured by putting a metal in a glass tube and heating and drawing together, and Patent Document 3 discloses an electric wire whose strength is improved by braiding a thin wire coated with silica. However, in these electric wires in Patent Documents 1 to 3, practical strength as a thin wire cannot be secured, and in fact, an alloy having a resistance value larger than that of pure metal in order to secure practical strength as a thin wire. Practical strength is secured by using as a conductor metal.

Japanese Utility Model Publication No. 58-88718 Japanese Patent Laid-Open No. 2-197019 Japanese Patent Laid-Open No. 11-7845

  In view of the above-described problems, an object of the present invention is to provide an insulated wire that can ensure practical strength even when the diameter is reduced.

The present invention is composed of a conductor and an insulating coating layer that covers the conductor, and the insulating coating layer is composed of synthetic silica glass that covers a portion other than the exposed end of the conductor in a sealed state. It is an insulated wire.
The conductor is not limited as long as it is a conductive conductor having a required strength and a required resistance value even when the diameter is reduced, and includes conductors of various materials that satisfy the required performance.

According to the present invention, practical strength can be ensured even with an insulated electric wire having a reduced diameter.
More specifically, an insulated wire having sufficient practical strength can be formed by covering a conductor with an insulating coating layer made of synthetic silica glass.

In addition, an insulating coating layer made of synthetic silica glass having practical strength is used to cover the conductors other than the ends in a sealed state, so that oxygen, hydrogen, and moisture in the atmosphere diffuse in the insulating coating layer and the conductor Thus, environmental factors can be prevented from affecting long-term reliability.
Therefore, the insulated wire can be used stably for a long period of time without degrading the low resistance conductor.

As an aspect of the present invention, the conductor can be composed of any one of pure silver, pure copper, pure aluminum, and carbon nanotubes.
According to the present invention, it is possible to configure an insulated wire including a low-resistance conductor having a required strength even when the diameter is reduced. As described above, since a low-resistance conductor having a required strength can be selected from a plurality of types of materials, an appropriate insulated wire according to the application and specifications can be configured.

As an aspect of the present invention, the synthetic silica glass can be a high purity anhydrous synthetic silica glass.
According to the present invention, it is possible to improve flexibility, insulation, and sealing, and it is possible to configure an insulating coating layer that satisfies required performances such as suppression of deterioration due to hydrogen, oxygen, or moisture and durability.

As an aspect of the present invention, a carbon coat layer covering the outer surface of the insulating coating layer can be provided.
According to the present invention, a more durable insulated wire can be configured. Specifically, although the insulating coating layer made of silica glass has practical strength, there is a possibility of external contact depending on the use environment, and if the insulating coating layer made of silica glass is damaged by external contact, the strength decreases. Although there is a possibility of causing the damage, the carbon coating layer covering the outer surface of the insulating coating layer can prevent the insulating coating layer from being damaged.

  The insulating coating layer made of silica glass may be coated with an acrylic resin or the like, but the thickness of the resin coating layer is increased and the wire diameter is increased. On the other hand, in the case of the carbon coat layer covering the outer surface of the insulating coating layer, since the required coat performance is obtained even if the coat layer is thin, the increase in the diameter of the electric wire can be suppressed. Further, by grounding the carbon coat layer, for example, a noise removing function can be provided as in a so-called coaxial cable.

As an aspect of the present invention, the wire diameter φ can be set to 0.05 mm to 0.5 mm.
According to the present invention, an insulated wire having a desired resistance value and bending performance can be configured even with an insulated wire having a wire diameter φ reduced to 0.05 mm to 0.5 mm.

  According to the present invention, it is possible to provide an insulated wire that can ensure practical strength even when the diameter is reduced.

The schematic perspective view of an insulated wire. The schematic perspective view of the insulated wire provided with the carbon coat layer. Explanatory drawing about the manufacturing method of an insulated wire.

  FIG. 1 is a schematic perspective view of the insulated wire 1, FIG. 2 is a schematic perspective view of the insulated wire 1 provided with the carbon coat layer 30, and FIG. 3 is an explanatory view of a method for manufacturing the insulated wire 1. . In FIGS. 1 to 3, a part of the length direction is omitted. Further, in FIGS. 1 to 3, the size of the conductor 10 and the insulating coating layer 20 is not strictly illustrated in order to clarify the arrangement and the relationship between the conductor 10 and the insulating coating layer 20. 3D shows the front side of the silica glass rod 120 where the conductor accommodating portion 150 is formed in a transparent state, and FIG. 3E also shows the front side of the same portion of the silica glass rod 130 being transmitted. It is shown in a state.

  The insulated wire 1 is a wire in which a metal described later and synthetic silica glass are heated and drawn together to reduce the wire diameter φ to 0.05 mm to 0.5 mm. The conductor 10 and the conductor 10 And an insulating coating layer 20 that coats the outer side with a predetermined thickness. Thus, in the insulated wire 1 which coat | covered the conductor 10 with the insulating coating layer 20, the conductor 10 is coat | covered by the insulating coating layer 20 in the sealing state except the edge part 1a.

  The conductor 10 is made of pure copper in the present embodiment, but even if it is other than pure copper, among the pure silver, pure aluminum, and carbon nanotube, performance such as conductivity required by the application and specifications (hereinafter, referred to as the conductor 10). Any one selected according to the required performance) can be configured.

The insulating coating layer 20 is a high-purity anhydrous synthetic silica glass having inevitable impurities of less than 0.1 ppm, and has a thickness of 10 to 100 nm.
As shown in FIG. 2, a carbon coat layer 30 that covers the outer surface of the insulating coating layer 20 may be provided outside the insulating coating layer 20.

Next, the manufacturing method of the insulated wire 1 comprised in this way is demonstrated.
First, SiCl ₄ is hydrolyzed in a flame of H ₂ · O ₂ to synthesize silica glass fine particle aggregate (soot rod) 100 having a diameter (φ) of 160 mm (see FIG. 3A).

In a He · Cl ₂ atmosphere, a soot rod 100 having a diameter of 160 mm is heated and dehydrated at 1500 ° C. to produce a high-purity anhydrous synthetic silica glass rod 110 having a diameter of 80 mm while removing impurities (see FIG. 3B).

The φ80 mm high-purity anhydrous synthetic silica glass rod 110 is heated and stretched by an electric furnace stretching apparatus (not shown) having a carbon heater to obtain a φ40 mm high-purity anhydrous synthetic silica glass rod 120 (hereinafter referred to as silica glass rod 120). (See FIG. 3C). And as shown in FIG.3 (d), the conductor accommodating part 150 is formed in the lower end of the silica glass rod 120 by drilling a hole of (phi) 5mm from the lower end of the silica glass rod 120 with an ultrasonic drill, and wash | cleaning with a hydrofluoric acid. To do.
Note that the depth L of the hole of the conductor housing portion 150 is a length obtained by combining a length L1 of a conductor base material 200 to be described later and a length L2 of an insertion portion 211 of the lower glass rod 210 to be described later.

Furthermore, the soot synthesis is performed up to φ250 mm on the silica glass rod 120 on which the conductor housing portion 150 is formed, dehydrated by heating at 1500 ° C. in a He · Cl ₂ atmosphere, and a φ125 mm high-purity anhydrous synthetic silica glass rod 130 (hereinafter, referred to as “sodium”) In FIG. 3 (e)).

  A conductor base material 200 of pure copper having a diameter of 5 mm is inserted into the conductor housing 150 from the bottom of the silica glass rod 130. The conductor base material 200 inserted into the conductor housing 150 is inserted so as not to be exposed from the lower end of the silica glass rod 130, and a glass pin (not shown) is inserted in the intersecting direction so that the conductor base material 200 does not fall. It is good to. Further, from below, a lower glass rod 210 having a diameter of 5 mm is inserted into the conductor housing 150 (see FIG. 3E).

In this state, the gap between the silica glass rod 130 and the conductor base material 200 in the conductor housing 150 is vented to the outside air, so that the lower part of the carbon heater in a high purity inert gas (He or Ar, N ₂ ) atmosphere is provided. It puts into a processing furnace (illustration omitted), heats to 2000 degreeC, and integrates the lower glass rod 210 and the silica glass rod 130. FIG.

  In this state, when the silica glass rod 130 having a diameter of 125 mm is drawn together with the conductor base material 200, the conductor base material 200 is drawn in a state protected by the silica glass rod 130 in an inert atmosphere. An insulated wire 1 having a diameter of 125 μm and an insulating coating layer 20 having a thickness of 5 mm can be manufactured (see FIG. 3F).

  The insulated wire 1 having a length of φ125 μm and a length of 100 km can be manufactured by drawing a silica glass rod 130 having a diameter of φ125 mm and a length of 100 mm. Moreover, the numerical value in the above description is an example regarding the dimension of each element, and is not limited to this numerical value.

For example, in the insulated wire 1 composed of the conductor 10 and the insulating coating layer 20 manufactured by the manufacturing method as described above, the insulating coating layer 20 is in a sealed state except for the end portion 1a where the conductor 10 is exposed. Since the conductor 10 other than the end portion 1a is covered with the insulating coating layer 20 made of synthetic silica glass in a hermetically sealed state, it is possible to obtain practical strength even for the insulated wire 1 having a reduced diameter. Can be secured.
Specifically, the insulated wire 1 having sufficient practical strength can be configured by covering the conductor 10 with the insulating coating layer 20 made of synthetic silica glass.

In addition, since the insulating coating layer 20 made of synthetic silica glass having practical strength covers the conductor 10 other than the end portion 1a in a sealed state, oxygen, hydrogen, and moisture in the atmosphere diffuse in the insulating coating layer 20. Thus, it is possible to prevent the environmental factor from affecting the long-term reliability.
Therefore, the insulated wire 1 can be used stably for a long period of time without degrading the conductor 10 having a low resistance value.

  In the above-described manufacturing method, in the conductor housing part 150 of the silica glass rod 130, the gap between the silica glass rod 130 and the conductor base material 200 is vented to the outside air. Since the silica glass rod 130 with the 200 inserted is put into a carbon heater lower processing furnace in a high-purity inert gas atmosphere and heated to 2000 ° C., the insulating coating layer other than the end portion 1a where the conductor 10 is exposed 20 can cover the conductor 10 in a sealed state.

  Moreover, the insulated wire 1 provided with the low-resistance conductor 10 having a required strength even when the diameter is reduced by configuring the conductor 10 with pure silver, pure copper, pure aluminum, or carbon nanotube. Can be configured. In addition, since the low-resistance conductor 10 having a required strength can be selected from a plurality of kinds of materials in this way, it is possible to configure an appropriate insulated wire 1 according to the application and specifications.

Furthermore, since the insulating coating layer 20 is a high-purity anhydrous synthetic silica glass that is dehydrated by heating at a predetermined temperature to remove impurities, the flexibility, insulating properties and sealing properties can be improved, and hydrogen, oxygen or The performance required for the insulating coating layer 20 such as suppression of deterioration due to moisture and durability can be satisfied.
Moreover, since the electric wire diameter (phi) of the insulated wire 1 mentioned above is 0.05 mm-0.5 mm, the insulated wire 1 which comprises a desired resistance value and bending performance can be comprised.

Moreover, as shown in FIG. 2, when the carbon coat layer 30 which covers the outer surface of the insulation coating layer 20 is provided, a more durable insulated wire 1 can be comprised.
Specifically, although the insulated wire 1 covered with the silica glass insulating coating layer 20 has practical strength, there is a possibility of external contact depending on the use environment, and the silica glass insulating coating is caused by the external contact. Damage to the layer 20 may cause a reduction in strength. On the other hand, damage to the insulating coating layer 20 can be prevented by the carbon coat layer 30 covering the outer surface of the insulating coating layer 20.

In addition, this invention is not limited only to the structure of the above-mentioned embodiment, Many embodiments can be obtained.
For example, by grounding the carbon coat layer 30 shown in FIG. 2, the insulated wire 1 having a noise removing function can be configured, for example, like a so-called coaxial wire.

  As described above, in the case of an insulated electric wire with a reduced diameter, it is more preferable to coat the insulating coating layer 20 with the carbon coating layer 30 although the thickness of the coating layer is thin and the carbon coating layer 30 having the required coating performance is more preferable. Instead of coating, an acrylic resin or the like may be used.

DESCRIPTION OF SYMBOLS 1 ... Insulated electric wire 10 ... Conductor 20 ... Insulation coating layer 30 ... Carbon coat layer

Claims (5)

It is composed of a conductor and an insulating coating layer that covers the conductor,
An insulated wire in which the insulating coating layer is made of synthetic silica glass that covers a portion other than the exposed end of the conductor in a sealed state. The insulated wire according to claim 1, wherein the conductor is made of pure silver, pure copper, pure aluminum, or carbon nanotube. The insulated wire according to claim 1 or 2, wherein the synthetic silica glass is high-purity anhydrous synthetic silica glass. The insulated wire in any one of Claims 1 thru | or 3 with which the carbon coat layer which covers the outer surface of the said insulation coating layer was provided. The insulated wire according to any one of claims 1 to 4, wherein the wire diameter φ is 0.05 mm to 0.5 mm.

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