JPH0619221U - Electrical wire - Google Patents

Abstract

(57) [Abstract] [Purpose] Abnormal heat generation can be visually observed from the outside by forming a heat-sensitive synthetic resin layer mixed with a temperature-sensitive dye that changes color due to temperature change from the outside over the entire circumference of the wire. Provide an electric wire that can be easily and surely detected by using a [Structure] Thermosensitive synthetic resin layer in which a thermosensitive dye that changes color due to temperature change is mixed around the conductive metal core wire (1).
(3) is formed, and the periphery of the heat-sensitive synthetic resin layer (3) is covered with an insulating transparent synthetic resin layer (4).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coated electric wire in which a conductive metal core wire is covered with an insulating synthetic resin coating.

[0002]

[Prior art]

 In general, the above-mentioned covered electric wires are widely used in various fields, and even for household use, in order to connect various commercially available electric devices to fixed outlets installed on wall surfaces, etc., one end of the covered electric wire is used. Plugs are used in electrical connection equipment that has an outlet such as a table tap at the other end. Such a household electrical connection device is usually provided with two or more plug insertion ports and is often used by connecting a plurality of plugs at the same time. Therefore, when the electric appliances connected to these plugs are used at the same time, or when the electric appliances that consume a large amount of electricity are continuously used for a long time, the table tap or the plug may generate heat. If such abnormal heat generation is left unattended, the covering part of the wire will ignite and cause a fire, which is extremely dangerous if not detected and dealt with early. Therefore, in order to detect this abnormal heat generation, conventionally, there are known ones in which a sensor is incorporated in the terminal portion of the electric wire or a temperature sensor is incorporated in a small hole in the insulating sleeve of the electric wire.

[0003]

[Problems to be solved by the device]

 However, with the former method, it is very troublesome and impractical to incorporate a sensor into a small terminal or wire to the alarm device, and in the latter case, a small hole is made in the insulating sleeve. There is a problem that it is difficult to check the temperature sensor itself because it is very small and it is difficult to fit the temperature sensor into it.

Therefore, in the present invention, a heat-sensitive synthetic resin layer mixed with a temperature-sensitive dye that changes color due to temperature change is formed so as to be permeated from the outside over the entire circumference of the wire, so that abnormal heat generation can be visually observed from the outside. The main purpose is to provide an electric wire that can be easily and surely detected by using.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has taken the following technical means. That is, in the electric wire (K) according to the present invention, the heat-sensitive synthetic resin layer (3) mixed with the thermosensitive dye that changes color due to temperature change is formed around the conductive metal core wire (1). The heat-sensitive synthetic resin layer (3) is covered with an insulating transparent synthetic resin layer (4). The heat-sensitive synthetic resin layer (4) may be directly coated on the metal core wire (1), or may be formed by interposing an insulating synthetic resin coating.

[0006]

[Action]

 With the wire configured as described above, if abnormal heating occurs in the wire (K) due to overload current, poor contact, or other causes during use, it will form around the metal core wire (1) of the wire (K). The heat-sensitive synthetic resin layer (3) that is exposed to this heat discolors, and through the transparent synthetic resin layer (4) from the outside, it is possible to easily visually detect the abnormal heat generation inside and quickly detect this. Can deal with.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, reference numeral (K) is an electric wire according to the present invention, which is a thermosensitive composition in which the outer peripheral surface of the conductive metal core wire (1) is mixed with a thermosensitive dye that changes color due to temperature change. The resin layer (3) is formed by coating. Further, an insulating transparent synthetic resin layer (4) is coated around the heat-sensitive synthetic resin layer (3). The heat-sensitive synthetic resin layer (3) and the transparent synthetic resin layer (4) are simultaneously formed at the same time as the formation of the synthetic resin coating body (2) of the electric wire (K), for example, by an existing molding apparatus having multiple extrusion ports. It could be easily manufactured by extrusion molding.

Further, as the temperature-sensitive dye mixed in the heat-sensitive synthetic resin material forming the heat-sensitive synthetic resin layer (3), a fine particle chromium compound (Chromium Compound) is used, and polyethylene, polypropylene or An appropriate amount is mixed with a synthetic resin material such as polyvinyl chloride or nylon. Although the coloring temperature varies depending on the mixing ratio of the temperature-sensitive dye, it is preferable that the surface layer be discolored at 60 to 70 degrees Celsius.

In the above structure, when abnormal heat generation occurs in the electric wire (K) due to overload current, poor contact, etc. during use, it is formed around the metal core wire (1) of the electric wire (K). The heat-sensitive synthetic resin layer (3) is discolored by receiving this heat, and it is possible to easily detect abnormal internal heat generation through the transparent synthetic resin layer (4) from the outside. In addition, since the transparent synthetic resin layer (4) is formed on the outer peripheral surface of the heat-sensitive synthetic resin layer (3), it is possible to prevent aging of the temperature-sensitive dye in the heat-sensitive synthetic resin layer, which is always accurate. You can change the color with various default settings. Further, in the above-mentioned embodiment, the heat-sensitive synthetic resin layer (3) is directly coated around the metal core wire (1), so that the heat conduction efficiency is good and the temperature at the time of heat generation can be accurately detected. .

FIGS. 4 and 5 show another embodiment of the present invention, in which an insulating synthetic resin cover (3) is provided between the heat-sensitive synthetic resin layer (3) and the metal core wire (1). 2) is interposed. In other words, in this embodiment, a heat-sensitive synthetic resin layer (3) and a transparent synthetic resin layer (4) are formed on the outer peripheral surface of a conventional coated electric wire having an insulating coating, Similar to the wire of the first embodiment, when abnormal heat generation occurs in the metal core wire (1), the heat-sensitive synthetic resin layer (3) is discolored by receiving this heat, and the transparent synthetic resin layer (4) is externally applied. It is possible to easily detect the abnormal heat generation inside by seeing through.

Although a representative embodiment of the present invention has been described above, the present invention is not necessarily limited to the structure of the above embodiment. For example, in the above embodiment, the inner metal core wire (1) has one or one bundle, but as shown in FIGS. 3 and 6, the metal core wire (1) has two or two bundles, or Although illustration is omitted, more than that may be possible. In addition, the present invention can be appropriately modified and implemented within a range that has the constituent features and has an effect.

[0012]

[Effect of device]

 Since the present invention is configured as described above, if abnormal heat is generated in the connection terminal part of the wire or part of the wire due to overload current or contact failure during use, this heat In response to this, the heat-sensitive resin layer of the wire discolors, and this abnormal heat generation can be easily visually recognized from the outside through the transparent synthetic resin layer, and it can be quickly dealt with to cause a fire. It is possible to prevent such accidents. In addition, since the heat-sensitive resin layer is formed over the entire area of the wire, the same effect can be achieved regardless of where the wire is cut and used, and the outer peripheral surface of the heat-sensitive synthetic resin layer is Since it is protected by the transparent synthetic resin layer, it is possible to prevent the weathering of the temperature-sensitive dye in the heat-sensitive synthetic resin layer over time, and it is possible to always change the color with an accurate initial setting value. Since the resin layer and the transparent synthetic resin layer can be simultaneously molded by a multi-molding device or the like, there is an effect that the resin layer and the transparent synthetic resin layer can be provided at almost the same cost as the conventional electric wire.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an electric wire according to the present invention.

2 is a cross-sectional view taken along the line AA in FIG.

FIG. 3 is a sectional view similar to FIG. 2, showing another embodiment of the present invention.

FIG. 4 is a sectional view showing still another embodiment of the present invention.

5 is a sectional view taken along the line BB in FIG.

FIG. 6 is a sectional view similar to FIG. 4, showing another embodiment of the present invention.

[Explanation of symbols]

 (1) Metal core wire (2) Synthetic resin coating (3) Heat-sensitive synthetic resin layer (4) Transparent synthetic resin layer (K) Coated wire

Claims (2)

[Scope of utility model registration request] 1. A heat-sensitive synthetic resin layer (3) in which a thermosensitive synthetic resin layer (3) containing a thermosensitive dye that changes color due to temperature change is coated on the outer peripheral surface of a conductive metal core wire (1). An electric wire in which the outer peripheral surface of 3) is covered with an insulating transparent synthetic resin layer (4). 2. A conductive metal core wire (1) is covered with an insulating synthetic resin coating (2), and the coating (2)
A heat-sensitive synthetic resin layer (3) in which a temperature-sensitive dye that changes color due to temperature change is mixed is formed on the outer peripheral surface of, and an insulating transparent synthetic resin layer (4) is formed around the heat-sensitive synthetic resin layer (3). Covered wire.