JPH067162U - 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 cylinder (1) for crimping an electric wire and a synthetic resin tube (2) made of nylon resin, wherein the synthetic resin tube (2) includes the metal cylinder (1). The small-diameter portion (2a) that is retained by fitting, and the large-diameter portions (2b), (2
b) A wire connecting sleeve comprising: a structure in which at least the outer surface of the synthetic resin tube (2) is coated with a heat-sensitive paint mixed with a temperature-sensitive dye that changes color due to 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.

Therefore, in the present invention, at least the outer surface of the wire connection sleeve is coated with a heat-sensitive paint mixed with a temperature-sensitive dye that changes color due to temperature change, so that abnormal heat generation in the connection terminal portion can be visually observed. The main purpose of the present invention is to provide a wire connection sleeve that can be easily and surely detected by means of the above method and can be manufactured at low cost by the same method as before without adding additional members or secondary processing. And what to do.

[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) made of nylon resin. Insert the synthetic resin tube (2) into the small diameter part (2a) in which the metal cylinder (1) is fitted and held, and the covering part of the covered electric wire (3) formed at both ends of the small diameter part (2a). An electric wire connecting sleeve having large diameter parts (2b) and (2b) having an inner diameter to be obtained, in which at least the outer surface of the synthetic resin tube (2) is mixed with a temperature-sensitive dye that changes color due to temperature change. It has a structure coated with heat-sensitive paint.

[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 as to adhere to 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. The surface of the produced synthetic resin sleeve (2) is discolored, and the danger can be easily visually recognized from the outside, and this can be dealt with promptly.

[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 nylon resin, which is formed on the small diameter portion (2a) and both ends of this small diameter portion (2a). It is formed by the large diameter parts (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 closely 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.

At least the outer surface of the synthetic resin sleeve (2) is coated with a heat-sensitive paint mixed with a temperature-sensitive dye that changes color due to temperature change. This coating is performed, for example, by passing the molded sleeve (2) through the inside of the booth of a spray coating machine by spray coating, or by soaking the sleeve (2) in a paint tank containing paint. It can be done by means of soaking. In the case of the former spray coating, only the outer surface of the sleeve (2) is coated, and in the case of the latter dipping, the entire surface inside and outside the sleeve is coated. In this coating, nylon resin, which has excellent water absorbency, is used as the material for the sleeve (2), so the coating impregnates the surface of the sleeve (2) and adheres firmly to it, so that a relatively thin film can be formed. The coating can be done reliably without peeling and the coating time can be shortened.

As the temperature-sensitive dye, a fine particle chromium compound (Chromium Compound) is used, and is mixed in an appropriate amount with a nylon resin material which is a molding material of 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 makes it convenient to see the inserted and crimped state of the wire (3) from the outside. Is.

In the present invention, the synthetic resin sleeve (2) does not have to be a heat-shrinkable material, and a heat-meltable resin layer is formed on the inner surface of the electric wire (3) during heat shrinkage. You may make it bond more firmly with. Further, the present invention is not limited to the structure of the above-described embodiment, and it is needless to say that the present invention can be appropriately modified and implemented within the scope of having the constituent features of the present invention and having the effect.

[0011]

[Effects of the Invention] Since the present invention is configured as described above, abnormal heat generation may occur at the connecting portion between the metal cylinder and the electric wire during use due to contact failure or overload current. The surface of the synthetic resin sleeve is discolored so that the danger can be easily detected visually from the outside.In particular, in the present invention, in the small diameter part of the synthetic resin sleeve, the entire outer peripheral surface of the metal cylinder is covered. Since it is tightly fixed so as to cover it, the heat of the metal cylinder can be efficiently sensed, the color can be reliably changed at the set temperature, and abnormal heat generation can be accurately notified. Since the sleeve itself is not subjected to secondary processing or attached parts, it can be produced at low cost and uses nylon resin with excellent water absorption as the material for the sleeve (2). Therefore, the paint impregnates the surface of the sleeve (2) and firmly adheres to it, so that even a relatively thin film can be reliably applied without peeling and the coating time can be shortened. It has the effect of being able to

[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) made of nylon resin, wherein the synthetic resin tube (2) is the metal tube body (1). ) Is retained inside, and a large diameter portion (2a) formed at both ends of the small diameter portion (2a) and having an inner diameter into which the covering portion of the covered electric wire (3) can be inserted.
An electric wire connecting sleeve comprising b) and (2b), in which at least the outer surface of the synthetic resin tube (2) is coated with a heat-sensitive paint mixed with a thermosensitive dye that changes color due to temperature change. Connection sleeve.