JPH0613344U - Adapter for drawing out the ground wire of the power cable connection - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an adapter for drawing out a waterproof grounding wire of a power cable connecting portion. [Structure] A waterproof type (with partition wall) sleeve was connected to the insulated wire, and a waterproof mold having a substantially crescent-shaped cross section was formed from a flexible vinyl resin or the like over the insulating coating of the insulated wire to the sleeve.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ground wire lead-out portion of a power cable connection portion.

[0002]

[Prior art]

 An example of the configuration of the conventional power cable connecting portion will be described with reference to the drawings. In FIG. 7, the tips of the power cables 1, 1 ′ to be connected are stripped off to expose the cable conductors 19, 19 ′, and the conductor sleeves 13 are pressure-welded and connected. A sleeve cover 14 is put on the outer circumference of the cable insulator, spacers 15 and 15 'are put on the cable insulators 20 and 20', respectively, and an insulating cylinder 16 is provided on the outer circumference thereof. Then, around the outer periphery of the power cables 1, 1 ′, to which the shield layers 18, 18 ′ are connected by a semi-conductive tape, are wound around the shield layers 2, 2 ′, respectively, and tin-plated annealed copper stranded wire is provided thereon. 17 is wound and provided to form a connection portion shielding layer. The connection portion is further formed by covering the outer periphery with the waterproof tape layer 7.

In such a structure of the connecting portion, the tin-plated annealed copper stranded wire 17 is soldered on the copper tape which is the shielding layer 2, 2 ′ of the power cable 1, 1 ′ so as to be electrically connected to the outside of the connecting portion. Is wrapped with an insulating waterproof tape 7 to insulate the waterproof and shielding layers from the ground.

In the case of such a structure, if the waterproof layer 7 formed of the waterproof tape on the outer periphery is sufficiently constructed, it is possible to obtain the same insulation characteristics as the vinyl anticorrosion layer of the power cables 1, 1 ′. It is possible to measure the resistance between the shielding layers 2 and 2'of the copper tape and the ground, that is, the insulation resistance (sheath meg) of the anticorrosion layer from the end of the power cable line.

However, in recent years, the use of a “cable shield layer insulation type” straight-line connection portion that insulates the cable shield layer (copper tape) without connecting at the connection portion and separates the shield layers of the left and right power cables Is being considered. (See Japanese Patent Application No. 3-260505)

Conventionally, the method shown in FIGS. 3, 4 and 5 has been adopted as a method for drawing out the ground wire from this type of cable connecting portion. That is, FIG. 3A is a lateral sectional view of the end portion of the connecting portion, and FIG. 3B is a side sectional view of the end portion of the connecting portion. A copper plate 5 and an annealed copper stranded wire 4 are soldered to the cable ground wire 6 in advance, and a sealing material 8 is attached to the top and bottom of the copper plate 5 and a waterproof tape 7 is wound. The sealing material 8 and the copper plate 5 stop water from entering between the wires of the ground wire 6 and from the gap 7a between the waterproof tape 7 and the ground wire 6.

However, since water penetrates from the gap of the gap 7a shown in FIG. 3 (A) to the twisted wire portion of the ground wire 6, between the twisted wire of the ground wire 6 and the ground, that is, the cable shield layer 2 and the ground. Insulation between the ground cannot be secured. As a modification of the above method, the method shown in FIG. 4 was considered. FIG. 4 is a side sectional view of the end portion of the connecting portion. In this figure, the gap 7a, which is a gap, is further thickly filled with the sealing material 8 by the method shown in FIG. By using the insulative sealing material as described above, it is possible to prevent water from entering the stranded wire of the ground wire 6 and ensure insulation.

A further improvement is the one shown in FIG. As shown in FIGS. 6 (A) and 6 (B), a front view and a cross-sectional view, a ground wire drawing cylinder 9 having an inner diameter substantially the same as the outer circumference of the cable sheath is used, and this is shown in FIG. 5 (B). The tape processing is performed as described above. The grounding wire 6 is connected to the grounding wire drawing cylinder 9 in advance through the grounding wire 4 made of annealed copper wire through the water stop sleeve 10, and the grounding wire 6 and the water stop sleeve 10 drawn out into the radial hole are waterproofed. It is fixed by sealing with tape 7.

Therefore, as shown in the cross-sectional view of FIG. 5 (A), since there is no gap between the waterproof tape 7 and the cable sheath, water does not enter from here. Further, the infiltration of water from the inside of the ground wire is prevented by the water blocking sleeve 10 and the waterproof tape 7.

[0009]

[Problems to be solved by the device]

 In the type using the conventional copper plate 5 shown in FIG. 3, the copper plate 5 can prevent water from entering the connection portion, but cannot insulate the cable shield. Also, with the method shown in Fig. 4, it is possible to insulate the cable shield, but the waterproofing and insulating properties are affected by the winding method of the sealing material 8, and it depends largely on the on-site work by a skilled person. Become.

In order to solve this problem, the method shown in FIG. 5 was considered, but this method facilitated reliable insulation of the cable shielding layer, but the following points were problematic. Become. That is, it is necessary to prepare several types of the ground wire drawing cylinders 9 shown in FIGS. 6A and 6B in accordance with the size of the cable to be connected. Further, as shown in FIGS. 5 (A) and 5 (B), the ground wire 6 is pulled out in the vertical direction with respect to the cable 1, so there is a possibility that it will be an obstacle to the installation and work. Furthermore, there is a problem that the workability is poor because there are three tape treatments on the ground wire drawing cylinder 9.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art, completely prevent the intrusion of water from the ground wire lead-out portion, and yet insulate the cable shielding layer from the ground. The purpose is to provide an adapter that completely waterproofs and insulates the ground wire lead-out part.

[0012]

[Means for Solving the Problems]

 In this invention, a waterproof type (with partition wall) sleeve is connected to an insulated wire, and a waterproof mold is formed from the insulating coating of the insulated wire to a sleeve with a flexible vinyl resin, etc., in a substantially crescent-shaped cross section. It is an adapter for pulling out the ground wire of the cable connection part. In addition, it is an adapter for drawing out the ground wire of the power cable connection part with a waterproof adhesive attached to the inner surface of the mold part.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1A and 1B are a front view and a cross-sectional view showing a configuration of an adapter 11 for drawing out a ground wire of a power cable connecting portion. The left and right tin-plated annealed copper ground wires 4 and 6 are connected by pressure fitting with a waterproof sleeve 12 and molded into a crescent-shaped cross section with a flexible resin 22 such as soft vinyl. The adhesive waterproof material 21 is attached to 11a. The intermediate portion of the waterproof sleeve 12 does not pass through the hole, but serves as a partition wall. Therefore, the cable shield layer 2 is completely insulated. Further, since the ground adapter 11 is molded, the ground adapter 11 and the ground wire 6 are completely adhered to each other, so that water does not enter from here. Therefore, the cable shielding layer is completely insulated.

FIGS. 2A and 2B show a state in which the ground wire of the cable connecting portion using the ground adapter 11 is drawn out. That is, after one end of the ground wire 4 is soldered onto the cable shielding layer 2, the ground wire 4 is pressed against the cable sheath 1 so as to cover the ground adapter 11 having a crescent cross-section, and is wound and attached with the waterproof tape 7. At this time, since the grounding adapter 11 is made of soft vinyl or the like, it can be easily deformed in accordance with the cable sheath 1 having a circular cross section without generating a space. Further, as shown in the front view of FIG. 2A, the ground adapter 11 can be easily deformed along the cable sheath 1 by pressing and winding the outer circumference thereof with tape, and no gap is formed. . Furthermore, since the inner surface 11a of the ground adapter 11 is provided with an adhesive waterproof material, it is completely waterproof.

[0015]

[Effect of device]

 As described above, the adapter for drawing out the ground wire of the power cable connecting portion of the present invention can easily cope with many cable sizes, so that the product size is reduced and it is economical. In addition, workability is improved because the tape winding work can be done in only one place. Another advantage is that the ground wire is drawn along the cable, so there is little possibility of hindrance during work such as laying. Moreover, since the waterproof and insulating parts are realized by the grounding adapter body that is molded in one piece, stable insulation characteristics can be obtained without depending on field work.

[Brief description of drawings]

1A and 1B are a front view and a side view showing a configuration of an adapter for drawing out a ground wire of a power cable connecting portion according to an embodiment of the present invention;

2 (A) and 2 (B) are a front view and a side cross-sectional view showing a state in which an adapter for pulling out a ground wire of a power cable connecting portion of FIG. 1 is applied to the connecting portion;

3 (A) and 3 (B) are a front view and a side sectional view showing an example of a conventional grounding wire drawing method;

FIG. 4 is a side cross-sectional view showing another example of a conventional grounding wire drawing method,

5 (A) and 5 (B) are a front view and a side cross-sectional view showing an example of a conventional improved ground wire lead-out method.

6 (A) and 6 (B) are a front view and a side cross-sectional view showing the structure of a ground wire drawing cylinder used in the ground wire drawing system of FIG.

FIG. 7 is a cross-sectional view showing a configuration of a conventional power cable linear connecting portion.

[Explanation of symbols]

 1,1 'Power cable 2,2' Power cable shielding layer 3 Power cable external semi-conductive layer 4 Annealed copper stranded wire (ground wire) 5 Copper plate 6 Insulated wire (ground wire) 7 Waterproof tape layer 8 Sealing material 9 For ground wire extension Tube 10 Water stop sleeve 11 Ground adapter 12 Waterproof sleeve with partition wall 21 Adhesive waterproof material 22 Flexible resin such as soft vinyl

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noboru Shibata 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture "Hitachi Cable Co., Ltd. Hidaka Plant" (72) Inventor Sachio Tazawa Hitachi City, Ibaraki Prefecture 5-1-1 Takamachi "Hitachi Cable Co., Ltd. Hidaka Factory"

Claims (3)

[Scope of utility model registration request] 1. A waterproof type (with partition wall) sleeve is connected to the insulated wire, and a waterproof mold having a substantially crescent-shaped cross-section is molded from the insulating coating of the insulated wire to the sleeve with a flexible soft vinyl resin or the like. An adapter for pulling out the ground wire of the power cable connection part, which is characterized by: 2. An adapter for drawing out a ground wire of a power cable connecting portion according to claim 1, wherein a waterproof adhesive is attached to the molded inner surface. 3. A ground wire pull-out for a power cable connecting part, characterized in that when pulling out a ground wire of a cable from which a step of a power cable connecting part has been peeled off, the above-mentioned ground wire adapter is attached and pulled out to be a waterproof type. Department