JPH06165363A - Connection structure of cable conductor - Google Patents

Abstract

PURPOSE:To provide a connection structure of a cable conductor which is capable of breakup of a connection and reconnection and which can prevent an error in work and besides which is capable of downsizing. CONSTITUTION:A joint is constituted by inserting a connection of such structure that a pull cone 11 having a plurality of not through slits besides a slit piercing longitudinally in one place is set on the core 20 of a cable and that a contact ring 12 having an inside taper geared to the outside taper of the poll cone 11 and having a contact provided on its periphery is set on the pull cone 11, with a thrust piece 14 as fixing end, into a connected metal fitting 18 which has an inside diameter geared to the outside diameter of the contact ring 12. And, as a catch preventive mechanism of the connection, a catch groove geared to a stopper ring 16 is provided at one end of the inside periphery of the connected metal fitting 18, and a stopper ring 16, which has an outside diameter a little larger than the inside diameter of the connecting metal fitting and is cut at one part of its circumference, is engaged with that groove.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable conductor connecting structure.

[0002]

2. Description of the Related Art FIG. 1 is a partially cutaway sectional view of a conventional cable connecting portion. In FIG. 1, reference numeral 1 is a core wire of the cable stripped off. Reference numeral 2 is a wedge for electrically connecting the cable core 1 and the connection conductor 4. Reference numeral 3 is a wedge tightening metal fitting, which has a male screw portion 3'and is screwed into a female screw portion 4'provided on the connection conductor 4 side to push the wedge 3 in. 5 is an insulator of the connecting portion, and 6 is a protective case of the connecting portion.
Reference numeral 7 is an insulator of the cable to be connected. In the cable conductor connecting portion, the wedge 2 and the wedge tightening metal fitting 3 are inserted into the cable core wire 1 which has been stripped off first, and in this state, the cable core wire 1 and the wedge 2, By inserting the wedge tightening metal fitting 3 together and rotating the wedge tightening metal fitting 3, the male screw portion 3a of the wedge tightening metal fixture 3 and the female screw portion 4a of the connecting conductor are screwed to each other to give a predetermined tightening pressure.

FIG. 2 is a detailed view of the wedge. The wedge 2 has a hollow cylindrical shape, and several slits 2a are provided on the circumference thereof. Reference numeral 2b is a fitting portion with the wedge tightening fitting 3. Note that among the plurality of slits 2a, only one slit is a fully split slit and the other slits are cut in the middle. Fig. 3 is a detailed view of the wedge tightening fitting 3, which has a hollow cylindrical shape and has a male screw portion 3a at one end.
It has a fitting portion 3b with the wedge 2. When the tightening metal fitting 3 is tightened to the wedge 2, the wedge 2 will be the cable core wire 1
A tightening force is applied to the cable core wire 1 to electrically connect the cable core wire 1 and the connecting conductor wire 4 completely.

The conventional conductor connecting structure having such a structure has the following drawbacks. 1) As is clear from FIG. 1, since the position where the wedge 2 is attached is inside the cable connecting portion, the wedge tightening metal fitting 3 is tightened using a trumpet-shaped special tool, and the tightening condition is controlled by tightening torque. ing. In this case
If the bull core wire 1 is bent and inserted, the wedge 2
The bull's core wire 1 comes into contact and requires a larger torque than when it is normally inserted. For this reason, the operator feels that the wedge 2 is completely tightened and ends the work, which may cause heat generation trouble at the connection portion. 2) Also, as is apparent from FIG. 1, the work cannot be performed unless the inner diameter of the wedge tightening metal fitting 3 is larger than the outer diameter of the cable insulator 7, and the wedge tightening metal fitting 3 is for mounting a special tool. Since it requires a flange 3c with a slit 3d,
As a result, the size of the connecting portion must be increased in the outer diameter direction, resulting in an increase in the size of the entire connecting portion.

[0005]

In view of the problems of the prior art, it is an object of the present invention to provide a cable conductor connecting structure capable of disassembling and reconnecting a connecting portion, preventing work mistakes, and downsizing. With the goal.

[0006]

A pulling cone 11 having a plurality of non-through slits in addition to a slit penetrating in the longitudinal direction on the cable core wire 20 in advance is inserted into the pulling cord 20. A contact ring 12 having an inner taper corresponding to the outer taper of the tension cone 11 and having a contactor 12a on the outer peripheral surface thereof is provided with a thrust piece 14 as a fixed end. The connecting portion having the structure formed by inserting was inserted into the connected metal fitting 18 having an inner diameter corresponding to the outer diameter of the contact ring 12 to form the connecting portion. Further, as a hooking prevention mechanism of the connecting portion, a hooking groove 18a corresponding to the stopper ring 16 is provided in a part of the inner circumference of the connected metal fitting 18, and the outer diameter of the groove 18a is slightly larger than the inner diameter of the connecting metal fitting. A stopper ring 16 having an outer diameter and formed by cutting a part of the circumference was fitted.

Further, the tension cone 11 has a threaded portion at its tip, a female threaded portion corresponding to the threaded portion is provided, and a groove for accommodating the slide ring 19 is provided on the outer peripheral portion, and a slide ring is provided in the grooved portion. Stopper 13
A connecting portion screwed into the tip portion of the connector 11 was inserted into the metal fitting 8 to be connected, and the stopper ring 16 was used to prevent it from coming off. Furthermore, a tension cone having a taper angle of the outer peripheral surface of 2 to 3 degrees and a taper angle of the inner peripheral surface are angles corresponding to the taper angle of the outer peripheral surface of the tension cone. When the contact ring was used, the contact ring was inserted on the pulling cone when it was joined with the cable conductor, and the movement (insertion) amount of the contact ring was set in the range of 5 to 15 mm.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given with reference to FIG. FIG. 4 is a partially cutaway sectional view of the cable connecting portion. FIG. 5 is a detailed view of the cable conductor connecting portion, and FIG. 6 is a detailed view of the connecting conductor. Now, in FIG. 4, 11 is a tensile cone, which is a cone-shaped hollow body provided with a plurality of slits (not shown) in the longitudinal direction. Reference numeral 12 is a contact ring, which has a hollow cylindrical shape as shown in FIG.
Has 2b. The contact 12a is fitted in the groove 12b against its elasticity, and the inner peripheral surface is provided with a tension cone 1a.
It is fitted to the taper of the outer peripheral surface of No. 1. Reference numeral 14 is a thrust piece, which has a flange shape and a cable core wire 20 at the center.
And a large hole into which the cable insulator 21 fits. The thrust ring 14 is used as one fixed end, and the contact ring 12 is inserted with a tool, for example, 5 to 15 mm. The contact ring 12 can be inserted with a simple tool, so that the cable core wire 20 and the contact ring 12 are connected. Reference numeral 15 is a rubber stress coil that constitutes the connection portion.
17 is an epoxy resin insulator which also constitutes a connecting portion, and 18 is a metal fitting to be connected to the inside of the contact ring 1
2 has a hole that fits the outer shape. 16 in FIG.
Is a stopper ring, 19 is a slide ring, and 13 is a stopper.

[0009]

[Assembling Method] Next, the order of assembling the conductor connecting portion will be described.
First, the coating of the cable to be connected is stripped off to expose the cable core wire 20 and the cable insulator 21 (see FIG. 5).
Stress cone 15, thrust piece 14, tension cone
The cable 11 is inserted into the cable core 20 in this order, and finally the contact ring 12 is inserted onto the tension cone 11 with a special tool at a pressure of about 5 to 6 tons. As described above, the pulling cone 11 has several slits in the vertical direction (one slit penetrates in the vertical direction). Cable core 20 and tension cone 11 by force, and contact ring 1
2 and mechanically and electrically connected to each other firmly. When such a conductor connecting portion is inserted into the hole of the connected metal fitting 18 as shown in FIG. 4, the contact 12a of the contact ring 12 is connected to the connected metal fitting 1.
The inner surface of 8 is contacted and electrically connected.

In the conductor connecting portion, when the cable itself has three twists (triplex) such that the size of the cable core wire 20 is 600 mm ² or less, the cable core wire 20 is The amount of expansion and contraction due to heat is absorbed by the twisting effect of the cable and does not affect the connection part. However, in the case of a single-core cable of 800 mm ² or more, the amount of expansion and contraction of the cable core wire due to heat has an effect on the amount of movement of the conductor at the cable end portion and the straight line connection portion. When such a phenomenon occurs at the connection part,
There is a concern that the contact ring 12 may come off the connected fitting 18. This measure will be described with reference to FIG.

First, as shown in FIG. 6, a groove for accommodating the stopper ring 16 is formed on a part of the circumference of the inner diameter of the metal fitting 18 to be connected.
18a is provided, and the stopper ring 16 is housed in the groove 18a. The stopper ring 16 is formed by cutting a part of its circumference, and when the stopper 13 described later is inserted, the diameter of the stopper ring 16 is slightly increased. (The inner diameter of the stopper ring 16 is slightly smaller than the outer diameter of the stopper 13).

Next, the stopper 13 fitted into the connected metal fitting 18 having such a structure will be described. As shown in FIG. 5, the tension cone 11 has a stopper 13 on the outer peripheral surface on the small diameter portion side.
There is provided a screw portion 11a which can be screwed into. Stopper-1
3 is hollow and has an inner surface provided with a threaded portion 13a capable of being screwed into the threaded portion 11a of the pulling cone 11, and the outer peripheral surface accommodates the stopper ring 16 and the slide ring 19 to form a small gap. The storage groove 13b is provided to some extent. The slide ring 19 can maintain the ring shape by soldering after being housed in the housing groove 13b.

The above-described components are sequentially assembled on the cable core wire 20 stripped off as shown in FIG. That is, the stress cone 15, the thrust piece 14, the tension cone 11,
The contact ring 12 is the same as the above-mentioned assembling method. After the stopper 13 is screwed into the tip of the pulling cone 11, the conductor connecting portion is inserted into the connected metal fitting 18, and the stopper 13 is inserted into the groove portion 13b of the stopper 13. -The ring 16 is inserted, the stopper 13 and the metal fitting 18 are mechanically fixed, and the contact ring 12 does not come off the metal fitting 18 even if the cable core wire 20 expands and contracts. . When the stopper mechanism is released, when the conductor connecting portion is further pushed, the stopper ring 16 rides on the slide ring 19. If the conductor connecting portion is pulled out in this state, the stopper ring 16 does not fall into the groove 13b, so that the conductor connecting portion can be pulled out.

When the conductor connecting portion according to the present invention is applied to the connection between electric power cables and the connecting portion between the electric power cable and the electric equipment, the shape and size of the connecting portion should be balanced. Is required. That is, a mutual balance between the outer diameter and the length is required. From this point of view, in order to further reduce the size of the conductor connecting portion, the movement amount of the contact ring and the contact pressure to the cable conductor (tensile cone) are changed while changing the taper angle of the outer peripheral surface of the tension cone. As a result of investigating the relationship of the contact pressure on the cable conductor due to the reduction of the inner diameter, the amount of movement of the contact ring becomes 5 to 15 mm when the taper angle of the outer surface of the tension cone is 2 to 3 mm. It was found that the best balance was achieved with the longitudinal direction, and the size was the smallest. However, the cable conductor is JISC3606
It is a range of copper stranded wire specified in high voltage cross-linked polyethylene insulation power cable.

[0015]

EFFECT OF THE INVENTION Since the wedge is not tightened at the connecting portion by rotating the wedge tightening metal fitting as in the conventional case, the wedge tightening error is eliminated. The electrical connection with the mating conductor is made by the elastic contact of the contact 12a, and the stopper mechanism has a releasable structure, which facilitates the disassembly and reconnection of the connection portion. Since no other metal fittings for tightening the wedge are used, it is possible to make the outer diameter smaller by this amount. Also, by limiting the taper angle and the insertion amount, work with a simple tool is possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a known cable conductor connecting portion structure.

2A and 2B are single-part views of a wedge, FIG. 2A is a front view shown in an upper half section, and FIG. 2B is a side view.

FIG. 3 is a front view showing an upper half cross section of a wedge tightening fitting,
FIG. 3B is a side view of the same.

FIG. 4 is a cross-sectional view showing a connection portion structure according to the present invention.

FIG. 5 is a detailed sectional view of a cable connecting portion.

FIG. 6 is a cross-sectional view of a connection conductor.

[Explanation of symbols]

11 Tension cone 11a Thread 12 Contact ring 12a Contact 12b Groove 13 Stopper 13a Thread 13b Storage groove 14 Thrust piece 15 Stress cone
16 Stopper ring 17 Insulator 18 Connected metal fitting 18a Locking groove 19 Slide ring 20 Cable core wire 21 Cable insulator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuaki Ishihara 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Go Hagiwara 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (4)

[Claims] 1. A tensile cone (11) having a plurality of non-penetrating slits in addition to a slit penetrating longitudinally in one place on the cable core (20) in advance, and the tensile cone (11) is inserted. The internal tape corresponding to the external taper of the tension cone (11)
The contact ring (12), which is provided with a contactor (12a) on its outer peripheral surface and has a thrust piece (14) as a fixed end, is connected to the contact portion of the contact ring (12). A cable conductor connection structure characterized by being inserted into a metal fitting (18) having an inner diameter corresponding to the outer diameter. 2. A hooking groove (18a) corresponding to the stopper ring (16) is provided in a part of the inner circumference of the connected metal fitting (18) as a pull-out preventing mechanism of the connecting portion, and the groove (18a) is provided with the engaging groove (18a). 2. The cable conductor connection according to claim 1, wherein the outer diameter has an outer diameter slightly larger than the inner diameter of the connection fitting, and a stopper ring (16) formed by cutting a part of the circumference is fitted. Construction. 3. A pulling cone (11) is provided with a threaded portion at its tip, a female threaded portion corresponding to the threaded portion is provided, and a groove for accommodating a slide ring (19) is provided at an outer peripheral portion, and the slide portion is slid into the grooved portion. Pull the stopper (13) with the ring (19)
2. The cable conductor according to claim 1, wherein a connecting portion screwed into the tip of the connector (11) is inserted into the metal fitting (18) to be connected, and a stopper ring (16) is used to prevent the cable from coming off. Connection structure. 4. A tension cone with an outer peripheral taper angle of 2 to 3 degrees and an inner peripheral taper angle with an outer peripheral taper angle of the tensile cone. A contact ring with an appropriate angle is used, and when joining with the cable conductor, the contact ring is inserted on the tensile cone and the movement (insertion) amount of the contact ring is set in the range of 5 to 15 mm. The cable conductor connection structure according to claim 1.