JPH067161U - Wire connection sleeve - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an electric wire connection sleeve capable of easily and accurately detecting abnormal heat generation in an electric wire connection portion at low cost. [Structure] A metal cylindrical body (1) for crimping an electric wire and a synthetic resin tube (2), and the synthetic resin tube (2) has a small diameter portion in which the metal cylindrical body (1) is fitted and held. (2a) and this small diameter part
(2a) is a wire connecting sleeve having a large diameter portion (2b), (2b) having an inner diameter capable of inserting the covering portion of the covered electric wire (3) to be inserted, the synthetic resin tube (2 ) Is formed of a heat-sensitive synthetic resin material mixed with a temperature-sensitive dye that changes color with temperature change.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric wire connection sleeve used for linearly connecting left and right covered electric wires, and more particularly, to an electric wire connection sleeve capable of visually recognizing abnormal heat generation in an electric wire connection portion. It is a thing.

[0002]

[Prior art]

 Generally, if abnormal heat is generated in the wire connection sleeve or the wire connection part of the wire connection terminal due to poor contact, overload current, etc., it is very dangerous if you do not deal with it immediately. is there. Therefore, conventionally, for example, as disclosed in Japanese Utility Model Laid-Open No. 62-67468, a sensor is incorporated in an insulating sleeve of a terminal so that an alarm device notifies that there is an abnormal heating of a set value. As disclosed in Japanese Laid-Open Patent Publication No. 62-37173, it is proposed that 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 not very practical and practical to incorporate a sensor into a small terminal or wire to an alarm device.In the latter case, a small hole is made in the insulating sleeve. While the work of fitting the temperature sensor into it is troublesome, the temperature sensor itself becomes extremely small, making it difficult to confirm.

In view of this, in the present invention, the entire wire connection sleeve is molded with a heat-sensitive synthetic resin material mixed with a temperature-sensitive dye that changes color due to temperature changes, so that abnormal heat generation at the connection terminal portion can be easily visually observed. The main purpose of the present invention is to provide a wire connection sleeve that can be reliably detected and can be manufactured inexpensively by the same means as before without adding additional members or secondary processing. Is.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, an electric wire connecting sleeve according to the present invention comprises a metal tube body (1) for crimping an electric wire and a synthetic resin tube (2). 2) is a large-diameter portion (2a) in which the metal cylinder (1) is fitted and held, and a large-diameter inner diameter formed at both ends of the small-diameter portion (2a) into which the covered portion of the covered electric wire (3) can be inserted. An electric wire connecting sleeve having diametrical portions (2b), (2b), wherein the synthetic resin tube (2) is made of a heat-sensitive synthetic resin material mixed with a thermosensitive dye that changes color due to temperature change. It has a structure of

[0006]

[Action]

 In the electric wire connecting sleeve configured as described above, as shown in FIG. 2, the large diameter portions (2b) and (2b) of the synthetic resin sleeve (2) are connected to the metal cylindrical body (1) to cover the covered electric wire (3). After inserting the core wire (3a), as shown in FIG. 3, the metal cylinder (1) is crimped from the outer peripheral surface with a crimping tool to be joined. After that, if necessary, the large diameter parts (2b) and (2b) of the synthetic resin tube are heated and shrunk by using a heating device such as a hot gun so that they are brought into close contact with the outer peripheral surface of the covered part of the covered electric wire (3). The electric wire thus connected is energized for use. If abnormal heat is generated at the connection between the metal cylinder (1) and the electric wire (3) due to poor contact or overload current during use, the metal cylinder (1) will be fixed in close contact with the outer peripheral surface. Moreover, the entire synthetic resin sleeve (2) is discolored and the danger can be easily visually detected from the outside, and the danger can be quickly dealt with.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral (1) is a metal cylinder body (1) for crimping an electric wire, which is formed with an inner diameter into which a core wire (3a) of a covered electric wire (3) can be inserted. Reference numeral (2) is an insulating synthetic resin tube (2) made of heat-shrinkable resin, and has a small diameter portion (2a) and large diameter portions (2a) formed at both ends of the small diameter portion (2a). 2b) and (2b). The small diameter part (2a) of the synthetic resin tube (2) is internally provided with the metal cylinder (1), and the small diameter part (2a) is heat-shrinked to be tightly bonded to the outer peripheral surface of the metal cylinder. . Also, the large diameter parts (2b), (2b) of the synthetic resin tube (2) have an inner diameter such that the covered part of the covered electric wire (3) can be easily inserted in the uncontracted state before heating. Has been formed.

The insulating sleeve (2) is formed of a heat-sensitive synthetic resin material mixed with a temperature-sensitive dye that changes color due to temperature change. Chromium compound (British Chromium Compound) is used as this temperature-sensitive dye, and it is mixed in an appropriate amount with a synthetic resin material such as polyethylene, polypropylene, polyvinyl chloride, nylon, etc., which is the molding material for the sleeve (2). . Although the coloring temperature varies depending on the mixing ratio of the temperature-sensitive dye, it is preferable that the sleeve (2) is discolored at 60 to 70 degrees Celsius. The sleeve (2) is preferably made of a transparent or semi-transparent material that allows internal see-through, which allows the inserted state and crimped state of the wire (3) to be seen through from the outside. And convenient.

In the present invention, the synthetic resin sleeve (2) does not have to be a heat-shrinkable material, and a heat-fusible resin layer is formed on the inner surface of the sleeve (2) for heat shrinkage. ) May be more firmly connected. Furthermore, the present invention is not limited to the structure of the above-described embodiment, and it goes without saying that the invention can be implemented with appropriate modifications within a range that has the constituent features of the present invention and has an effect.

[0010]

[Effect of device]

 Since the present invention is configured as described above, if abnormal heat generation occurs at the connection between the metal cylinder and the electric wire due to contact failure or overload current during use, the synthetic resin sleeve The entire body is discolored and the danger can be easily visually recognized from the outside.Especially, in the present invention, the small diameter part of the synthetic resin sleeve is closely fixed so as to cover the entire outer peripheral surface of the metal cylinder. Therefore, the heat of the metal cylinder can be efficiently sensed, the color can be surely changed at the set temperature, and abnormal heat generation can be notified accurately. Since there is no processing or addition of accessory parts, there is an effect that it can be produced at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a wire connecting sleeve according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which a covered electric wire is inserted into the electric wire connecting sleeve.

FIG. 3 is a cross-sectional view showing a state in which a metal cylinder is pressure-bonded from the state of FIG.

[Explanation of symbols]

 (1) Metal cylinder (2) Synthetic resin sleeve (2a) Small diameter part of synthetic resin sleeve (2b) Large diameter part of synthetic resin sleeve (3) Covered wire (3a) Core wire of covered wire

Claims (1)

[Scope of utility model registration request] 1. A metal tube body (1) for crimping an electric wire and a synthetic resin tube (2), the synthetic resin tube (2) comprising:
A small diameter portion (2a) in which the metal cylinder (1) is fitted and held, and a large diameter portion (2b) having an inner diameter capable of inserting the covering portion of the covered electric wire (3) formed at both ends of the small diameter portion (2a). ), (2b), wherein the synthetic resin tube (2) is formed of a heat-sensitive synthetic resin material mixed with a temperature-sensitive dye that changes color due to temperature change.