JPH0619220U - Coated wire - Google Patents

Abstract

(57) [Summary] [Purpose] Abnormal heat generation can be easily observed from the outside by forming a heat-sensitive synthetic resin stripe that is mixed with a temperature-sensitive dye that changes color due to temperature changes over the entire length of the wire. In addition, it provides an electric wire that can be reliably detected. [Construction] An insulating synthetic resin coating (2) is coated around the conductive metal core wire (1). A plurality of stripes on the outer peripheral surface of the cover (2) at appropriate intervals in the circumferential direction.
Structures (3) are formed along the length direction, and the stripes (3) are formed of a heat-sensitive synthetic resin material in which a temperature-sensitive dye that changes color due to temperature change is mixed.

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, by forming a stripe made of a thermosensitive synthetic resin mixed with a temperature-sensitive dye that changes color due to temperature change, the abnormal heat generation can be easily visually observed from the outside. In addition, the main purpose is to provide an electric wire that can be reliably detected.

[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 electrically conductive metal core wire (1) is covered with the insulating synthetic resin coating (2). ), A plurality of stripes (3) are formed at appropriate intervals in the circumferential direction along the length direction, and the stripes (3) ... are thermosensitive dyes that change color due to temperature change. The structure is made of a heat-sensitive synthetic resin material mixed with.

Further, as a means for achieving the above object, a synthetic resin coating body (2) coated around the metal core wire (1) is formed of a transparent material, and the coating body (2) is The stripes (3) may be formed on the inner surface side.

[0007]

[Action]

 With the electric wire configured as described above, if abnormal heat generation occurs in the electric wire (K) due to overload current, poor contact, or other causes during use, the heat-sensitive synthetic resin formed on the electric wire (K) will be used. The stripes (3) ... are discolored by receiving this heat, and it is possible to easily visually detect abnormal internal heat generation from the outside and quickly deal with this.

[0008]

【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, in which a conductive metal core wire (1) is covered with an opaque insulating synthetic resin coating (2). On the peripheral surface of the cover (2), a plurality of, for example, four stripes (3) are formed along the length direction at appropriate intervals in the peripheral direction. The material of this stripe (3) ... is made of a heat-sensitive synthetic resin material mixed with a temperature-sensitive dye that changes color with temperature changes. The stripes (3) are easily manufactured by simultaneously extrusion-molding at the same time as the molding of the synthetic resin coating (2) of the electric wire (K), for example, by an existing molding device having multiple extrusion ports. I can do it.

Further, as the temperature-sensitive dye mixed in the heat-sensitive synthetic resin material constituting the above-mentioned stripe (3), a fine particle chromium compound (Chromium Compound) is used, and polyethylene, polypropylene or polychloride is used. It is mixed in an appropriate amount with synthetic resin materials such as vinyl and nylon. Although the color development 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 configuration, when abnormal heat generation occurs in the electric wire (K) due to overload current, poor contact, or other reasons during use, the heat-sensitive synthetic resin layer (around the electric wire (K) ( 3) receives this heat and discolors, and it will be possible to easily detect abnormal heat generation inside from the outside.

FIG. 4 shows another embodiment of the present invention in which the synthetic resin coating (2) is formed of an insulating transparent synthetic resin material. The stripes (3) are formed on the inner surface of the transparent synthetic resin coating (2) adjacent to the metal core wire (1). In this example as well, when abnormal heat generation occurs in the metal core wire (1), the stripes (3) ... discolor by receiving this heat, and the transparent synthetic resin coating (2) is seen from the outside to visually check. You can easily detect abnormal heat generation inside. In addition, since the stripe (3) is protected by the transparent synthetic resin coating (2), it is possible to prevent the weathering of the temperature-sensitive dye in the stripe from aging, and always change the color with an accurate initial set value. In addition, since the stripe (3) is directly adjacent to the periphery of the metal core wire (1), the heat transfer efficiency is good and the temperature at the time of heat generation can be accurately detected.

Although a typical 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 FIG. 3, the metal core wire (1) has two or two bundles, or is not shown. However, it may be more than that. Others In the present invention, it is possible to implement the invention by appropriately modifying it within the scope of having the constituent requirements and effects.

[0013]

[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 wire's stripes change color, and this abnormal heat generation can be easily detected visually from the outside, and it is possible to quickly deal with this and prevent accidents such as fires in advance. . In addition, since the stripe is formed over the entire length of the wire, the same effect can be achieved no matter where the wire is cut and used, and the amount of heat-sensitive synthetic resin used is omitted. As a result, the material can be saved, and in addition, since the strip can be simultaneously molded with the synthetic resin coating by the multiple molding device, it can be manufactured at low cost. Further, in the configuration in which the synthetic resin coating is made of a transparent synthetic resin material and the inner surface of the coating is scribed as described above, the stripe is protected by the transparent synthetic resin coating, so that the temperature inside the stribe is protected. It is possible to prevent the dye from aging over time, and it is possible to always change the color with an accurate initial setting value. Also, since the stripe is adjacent to the metal core wire, it has good heat transfer efficiency and accurately It has the effect of being able to detect the temperature.

[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.

[Explanation of symbols]

 (1) Metal core wire (2) Synthetic resin coating (3) Stripe (K) Coated electric wire

Claims (2)

[Scope of utility model registration request] 1. A conductive metal core wire (1) is covered with an insulating synthetic resin coating (2).
On the outer peripheral surface of (2), a plurality of stripes (3) are formed at appropriate intervals in the circumferential direction along the length direction, and the feeling that the stripes (3) ... Discolor due to temperature change A covered electric wire made of a heat-sensitive synthetic resin material mixed with a warm dye. 2. A conductive metal core wire (1) is covered with an insulating transparent synthetic resin coating (2), and the inner surface of the coating (2) is circumferentially appropriate. A plurality of stripes (3)… spaced apart are formed along the length direction,
A covered electric wire in which the stripe bodies (3) are formed of a heat-sensitive synthetic resin material mixed with a temperature-sensitive dye that changes color due to temperature change.