JPH069012U - Coated wire - Google Patents

Abstract

(57) [Summary] [Purpose] The entire covering of the covered electric wire is molded with a heat-sensitive synthetic resin material mixed with a temperature-sensitive dye that changes color due to temperature changes, making it easy to visually check for abnormal heat generation of the covered electric wire. Enabled to detect. [Constitution] A covered electric wire (1) in which a synthetic resin coating (3) is coated around a core wire (2) made of a conductor metal material, the synthetic resin coating (3) being A structure made of a heat-sensitive synthetic resin material mixed with a thermosensitive dye that changes color.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coated electric wire used in general electric equipment, and more particularly to a coated electric wire which allows easy visual recognition of abnormal heat generation in the electric wire.

[0002]

[Prior art]

 In general, if abnormal heat is generated in a covered wire, especially if abnormal heat is generated in the connection part of the covered wire to an electric device due to a contact failure or overload current, etc. It is a cause of occurrence and is extremely dangerous. Therefore, conventionally, for example, as disclosed in Japanese Utility Model Laid-Open No. 62-67468, a sensor is incorporated in the insulating sleeve of the terminal connected to the end of the covered electric wire, and an alarm is generated when the set value is abnormally generated. It has been proposed to inform it, or as shown in Japanese Utility Model Laid-Open No. 62-37173, one in which a part of an insulating sleeve is cut out and a temperature sensor made of a material that changes color due to temperature change is fitted therein. .

[0003]

[Problems to be solved by the device]

 However, in the former known method, it is very troublesome and impractical to incorporate a sensor into a small terminal or wire from this sensor to an alarm device, and in the latter case, a small hole is formed in the insulating sleeve. There is a problem in that it is difficult to insert the temperature sensor into the opening and it is difficult to check because the temperature sensor itself becomes very small.

In view of this, in the present invention, by forming the entire covering body of the covered electric wire with a heat-sensitive synthetic resin material mixed with a temperature-sensitive dye that changes color due to temperature change, abnormal heat is generated at any part of the covered electric wire. Even if it is possible to detect this easily and surely by visual inspection, and to provide a covered electric wire that can be manufactured inexpensively by the same means as before without adding additional members or secondary processing. The main purpose of this is.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the covered electric wire according to the present invention, as shown in the figure, a core (2) made of a conductive metal material is covered with a synthetic resin covering (3). The electric wire (1) has a structure in which the synthetic resin coating (3) is formed of a heat-sensitive synthetic resin material mixed with a thermosensitive dye that changes color due to temperature change.

[0006]

[Action]

 In the case of a covered electric wire (1) constructed as described above, the covering body (3) at the end is peeled off and the metal core wire (2) is directly connected to the outlet of the electric device, or connected to the metal crimp terminal. These crimp terminals are then used by connecting them to the outlets of electrical equipment.During use, the insulated wire may become damaged due to overload current or poor contact at the connection to the electrical equipment. When abnormal heat is generated, the heat generating portion of the sheath (3) of the covered electric wire is discolored, and the heat generating portion can be easily visually recognized from the outside, which can be promptly dealt with.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral (1) shows an embodiment of a covered electric wire according to the present invention, in which an insulating synthetic resin coating (3) is provided around a core wire (2) made of a conductor metal material such as copper wire. ) Is coated. The entire synthetic resin coating (3) is formed of a heat-sensitive synthetic resin material mixed with a temperature-sensitive dye that changes color due to temperature change.

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

The present invention is not limited to the structure of the above embodiment. For example, although the core wire (2) is formed of a single wire in the above embodiment, it is needless to say that it may be formed of a plurality of thin metal wires as shown in FIG. Further, the synthetic resin coating (3) can also be formed by incorporating a reinforcing cord-like material into the meat portion. In addition, it is needless to say that the present invention can be appropriately modified and implemented within a range in which the constituent features are provided and the effect is obtained.

[0010]

[Effect of device]

 Since the present invention is configured as described above, if abnormal heat is generated in the coated wire due to overload current or contact failure at the connection part to the electric device during use, The heat generation part of the cover (3) is discolored and the heat generation part can be easily visually recognized from the outside, which can be dealt with promptly, and the whole cover of the covered electric wire is a heat-sensitive synthetic resin. Since it is formed with, the same effect can be expected even if the coated electric wire is cut and used at any part, and the coated electric wire itself is not subjected to secondary processing or attached accessories. The advantage is that it can be produced at the same cost as before.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing another embodiment of the covered electric wire according to the present invention.

[Explanation of symbols]

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

Claims (1)

[Scope of utility model registration request] 1. A coated electric wire (1) comprising a core wire (2) made of a conductive metal material and a synthetic resin coating (3) coated around the core wire (2), wherein the synthetic resin coating (3) has a temperature of A covered electric wire made of a heat-sensitive synthetic resin material mixed with a temperature-sensitive dye that changes color with changes.