JP3280229B2 - Cable connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable connection portion used for conductor connection such as a straight connection portion or a branch connection portion of a cable.

[0002]

2. Description of the Related Art In a straight connection portion or a branch connection portion of a high-voltage cable, a structure for electrically and mechanically protecting the conductor connection portion is employed. FIG. 2 shows a vertical sectional view of a conventional general cable connection portion. (A) of the figure is a longitudinal sectional view of a main part of the connecting portion, and (b) and (c) are schematic sectional views during assembly. In the figure, a pair of cables 1 arranged on the left and right respectively peels a jacket 2 and an insulator 3 in order, exposing a conductor 4, and the conductor 4 is compression-connected to each other by a connection terminal 5. The insulation reinforcing member 6 is formed by molding an insulator, an epoxy resin, or the like, and is surrounded and protected by the connection box 7. A stress cone 11 is fitted into the insulator 3 of the cable 1, and is pressed against the inner wall surface of the insulating reinforcing body 6 with a predetermined pressure by using a push fitting 12 and a spring unit 13. The assembling is performed as follows.

First, as shown in FIG. 1B, the cable jacket 2 and the insulator 3 are separated. At this time, the cable 2 on the right side has the jacket 2 removed sufficiently long. Next, as shown in FIG.
A, 7B and 7C are attached to both cables together with the stress cone 11. Further, the conductor 4 is connected by compressing the connection terminal 5 in a state where the insulation reinforcing member 6 is put on the cable 1 on the right side in advance. Therefore, at this time, the stress cone 11 on the right side is retracted sufficiently to the right side of the regular position. Then, after the connection of the conductor 4 is completed, the insulating reinforcement 6 is slid in the direction of arrow A1, and then the stress cone 11 is also slid in the direction of arrow A2. After arranging the respective parts in the proper positions in this way, tightening of the spring unit 13 and formation of the tape winding part 9 are performed to complete the connection part.

[0004]

However, the above-mentioned conventional cable connection section has the following problems to be solved. When the above-described cable connection portion is attached to a manhole or the like where there is relatively little space, it is preferable to be as small as possible. Moreover, it is preferable that the assembling work is easy. However, as mentioned above,
A space for retracting the insulating reinforcement is required for conductor connection work, and the entire connection section including the size of the connection box becomes large. Moreover, when the stress cone is shifted or returned to the normal position, a strong force is required because the stress cone is strongly fitted on the insulator. This imposes a heavy burden on the operator, and the workability is poor. The present invention has been made in view of the above points, and it is an object of the present invention to provide a cable connecting portion which enables a reduction in the size of the entire connecting portion, facilitates assembly work, and improves workability. Things.

[0005]

The present invention employs the following structure to solve the above problems. <Structure> The present invention provides an insulating
Cable embedded in edge reinforcement and protruding from cable end
Cable conductors have connection holes, and the cable conductors
Connected to the internal electrode and mounted on the cable end
With a stress cone pressed against the inner wall of the insulation reinforcement
Fixing the cable conductor at the cable connection part with
Adapter that is inserted into the connection hole so that it can be inserted and removed
To the inner wall that is attached to the adapter and forms a connection hole.
Cable pull-out prevention member having a projecting member that can be projected in this way
And a recess provided at a position facing the protruding member on the inner wall.
To prevent the cable from being pulled out by being pressed by the stress cone
A moving member that enters the body and projects the projecting member into the concave portion;
It is characterized by including.

[0006] <Description> internal electrode provided inside the insulator reinforcement, the connection hole to insert the adapter for electrical connection between the cable conductors and the internal electrodes. And stress cones
When pressing against the inner wall of the edge reinforcement, this stress cone
Pressing the moving member further prevents the cable from being pulled out by the moving member.
A projecting member such as a projecting ball protrudes from the stopper, and the internal electrode
Into the recess. Thus, after the completion of connection protrusions
The cable terminal is prevented from coming off by the material or the like, and the connection portion is easily completed in a small size . In the case of a straight connection, two openings are provided, and in the case of a Y branch, three openings are provided.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below using specific examples. <Embodiment> FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of a cable connection part of the present invention. In the figure, cable 1 is
The jacket 2 and the insulator 3 are peeled off to expose the conductor 4 at the end. A connection terminal 31 and an adapter 32, which will be described later with reference to FIG. 3, are attached to the conductor 4.
Has been inserted. Protective fittings 25 are fixed to both ends of the insulating reinforcing body 20 to protect the terminal portion of the cable 1 together with the tape winding 9 in a waterproof manner. Further, the spring unit 13 and the push fitting 1 arranged on the inner peripheral surface of the protective fitting 25
2, stress cone 1 fitted into insulator 3
1 is configured to be pressed against the inner wall surface of the insulating reinforcement 20 with an appropriate pressure.

In the cable connecting portion of the present invention having the structure shown in this figure, a pair of left and right cables are inserted from the ends, and the electrical connection is completed by a slip-on type connection. Therefore, the terminal ends can be assembled by a relatively simple connection operation. In such a configuration, the cable 4 is preferably supported by the conductor 4 for pulling out the cable. Therefore, in the present invention,
A terminal structure as shown in FIG. 3 is employed.

FIG. 3 shows a detailed sectional view of the terminal structure. In the cable 1 shown in the figure, a conductor 4 is exposed from an end of an insulator 3 for a predetermined length, and a connection terminal 31 is compression-connected thereto. On the outer peripheral surface of the upper part of the connection terminal 31, a spring-like contact 33 for reducing electrical contact resistance in the case of slip-on connection or the like is arranged. The connection terminal 31 is covered with an adapter 32 that fits just outside the connection terminal 31. That is, the connection terminal 31 is fitted into a through hole provided in a shaft portion of the adapter 32, the tip of the connection terminal 31 slightly projects from the adapter 32, and a C-shaped stop ring 35 is fitted so that both do not come off. This has exactly the same configuration as a C-ring well known as a mechanical part.

[0010] The adapter 32 has a thick upper portion as viewed in the radial direction and a lower portion formed of a thin cylindrical conductor, and has a female screw portion 32A formed on the inner surface of the lower end. On the other hand, this adapter 3
The lower part of 2 is provided with a projection retracting mechanism including an outer pipe 36, an inner pipe 37, a spring 38, a protruding ball 39, and the like. A male screw portion 36A is formed on the outer periphery of the upper end of the outer pipe 36, and the female screw portion 32A of the adapter 32 is just formed.
And are connected to each other. Further, a stepped portion 36B is formed on the upper inner peripheral surface of the outer pipe 36.

A spring 3 is provided between the stepped portion 36B and a stepped portion 37B provided at the center of the inner pipe 37.
The spring 38 pushes the outer pipe 36 upward in the drawing and applies a force so as to push the inner pipe 37 downward. The outer pipe 36 is provided with several ball storage holes 36C at its lower part. A projecting ball 39 is accommodated in the ball accommodation hole 36C. The projecting ball 39 is formed of a steel ball or the like, and has an outer diameter selected so that a part thereof projects outward from the ball storage hole 36C. The outer peripheral surface of the inner pipe 37 is provided with a receiving groove 37C for receiving a part of the protruding ball 39 as described later.

Further, the projecting ball 39 is inserted into the ball storage hole 36.
When projecting outward from C, the internal electrode 23 is provided with a positioning groove 23B so as to receive the projecting portion. That is, in the state as shown in this figure, the protruding ball 39 has a part protruding outside from the ball storage hole 36C of the outer pipe 36 and protruding a part thereof into the positioning groove 23B. 23 is prevented from sliding up and down with respect to the inner wall surface of the connection hole. That is, the connection terminal 31 is prevented from coming off.

After the assembly, the tip or upper end of the stress cone 11 fitted on the outer peripheral surface of the cable 1 is pushed by the spring unit 13 shown in FIG.
The stopper 17 is pushed upward, and acts so as to press the flange portion 37D of the inner pipe 37 against the lower end surface of the internal electrode 23. With this force, the position of the inner pipe 37 is determined as shown in the figure.
The protruding ball 39 housed in 6C is pushed outward by the outer wall surface of the inner pipe 37, and a part thereof projects into the positioning groove 23B.

FIG. 4 shows a state of the cable terminal before the connection terminal is stored and positioned at the fixed position of the connection hole. Before the assembly of the cable connecting portion is completed, there is a gap between the stress cone 11 and the insulating reinforcing body 20, and the inner pipe 37 is still below the fixed position. When forming such a terminal, the connection terminal 31 is first compression-connected to the conductor 4 of the cable, and then the inner pipe 37 is formed.
And a spring 38 is fitted on the outside thereof, and the outer pipe 36 is further placed on the outside thereof. Next, spring 3
8 is compressed so that the upper end of the inner pipe 37 protrudes above the outer pipe 36. And in order to keep them from falling out,
The stopper ring 41 is fixed to the upper end of the inner pipe 37.

At this time, the projecting ball 39 is attached to the outer pipe 36.
Of the inner pipe 37 and the receiving groove 37C of the inner pipe 37. Therefore, the entire projecting ball 39 is
6 is located inside the outer peripheral surface and is not projected outside. Here, finally, the adapter 32 is screwed into the outer pipe 36 so that the end of the connection terminal 31 projects from the adapter 32,
When the C-shaped stop ring 35 is fitted, the assembly of the terminal portion is completed. Then, the adapter 32 is inserted into the connection hole of the internal electrode 23 in a state as shown in FIG. In this case,
Since the projecting ball 39 does not project outside, the adapter 32 is completely housed in the connection hole of the internal electrode 23 as shown in the figure.

In this state, the protruding ball 39 is disposed so as to face the positioning groove 23B. Here, when the stress cone 11 shown in FIG. 3 is pushed using the spring unit 13 shown in FIG. 1 or the like, the flange portion 37D of the inner pipe 37 is pushed upward via the stopper 17. As a result, the protruding ball 39 is pushed out of the receiving groove 37C, and is pushed by the outer wall surface of the inner pipe 37 so that the positioning groove 23
Part of it is projected to the B side. In this way, the protruding ball 39 positions the adapter 32 and the like in the state shown in FIG. 3, whereby the mechanical connection between the conductor 4 and the internal electrode 23 is achieved.

The cable connecting portion of the present invention having the above-described structure includes:
As described with reference to FIG. 1, the connection is made by a simple connection operation such as a slip-on type. Then, the connection terminal is prevented from coming off by the protrusion projecting / retracting mechanism including the protruding ball 39 and the like constituted by the adapter, and a connection portion having high mechanical strength is formed. In addition, since it is not necessary to retract the insulating reinforcement, it is possible to further reduce the size.

The present invention is not limited to the above embodiment. The projecting and retracting mechanism itself may be configured to project a pin or the like in addition to the above-described structure for projecting a ball.

[0019]

Cable connection of the present invention described above, according to the present invention is, in the connection hole of the internal electrodes of the insulating reinforcement, a cable conductor
Insert the fixed holding adapter to isolate the stress cone
The moving member is pressed by the stress cone when pressed against the reinforcement.
Move the protruding member out of the cable
Since so cause engaged into the recess of the internal electrodes Te, stress
The cable terminal workability is improved since it insertion by pressing or removal of scones, moreover, once inserted, it is possible to prevent the withdrawal of the cable end, can have high mechanical strength. In addition, the overall size can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of a cable connection part of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional cable connecting portion.

FIG. 3 is a longitudinal sectional view showing a conductor connection portion of a cable connection portion of the present invention.

FIG. 4 is a longitudinal sectional view for explaining a procedure for assembling the cable connecting portion of the present invention.

[Description of Signs] 1 Cable 3 Insulator 4 Conductor 11 Stress cone 17 Stopper 23 Internal electrode 23B Positioning groove 31 Connection terminal 32 Adapter 33, 34 Contact 36 Outer pipe 37 Inner pipe 37D Flange 39 Projecting ball

Claims (1)

(57) [Claims] And 1. A dielectric reinforcing material cable terminal is inserted, is embedded in the insulating reinforcement, has a distribution is the connection hole of the cable conductor projecting from the cable end, the cable conductor electrically connected A cable connecting portion including an internal electrode to be connected and a stress cone mounted on the cable end and pressed against the inner wall surface of the insulating reinforcement, wherein the cable conductor is fixedly held and can be inserted into and removed from the connection hole. An adapter, which is attached to the adapter, and has a projecting member having a projecting member protruding toward an inner wall forming the connection hole, and a concave portion provided at a position of the inner wall facing the projecting member. And a moving member that is pressed by the stress cone and enters the cable disconnection prevention body, and causes the protruding member to protrude into the recess. Characteristic cable connection.