JP3101036B2 - 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 connecting portion having a structure in which insulation is reinforced by using an insulating tube .

[0002]

2. Description of the Related Art In a connection portion of a CV cable assembled in a so-called prefabricated system, the following structure is employed to reinforce insulation of the connection portion. FIG. 2 shows a vertical sectional view of a main part of a conventional cable connecting portion. In the figure, in a cable 1, a sheath 2, a shielding layer 3, and a semiconductive layer 4 are sequentially peeled off to expose an insulating layer 5. This connection portion is configured to connect the cable 1 linearly to another cable. Here, in order to secure the insulation thickness of this connection part, the insulation cylinder 7 is fitted via the insulation spacer 6 as shown in the figure. Both the insulating spacer 6 and the insulating cylinder 7 are made of synthetic rubber or plastic. The insulating spacer 6 has an insulating portion 6A at a central portion and a semiconductive portion 6B at both end portions. Further, the insulating cylinder 7 has an insulating portion 7A at a central portion, and has a semiconductive portion 7B at an outer peripheral surface and both end portions.

In assembling such a cable connection part,
Conduct conductor connection in advance , and insulate insulation 5 of cable 1
Place the p o 6, then fitted while shifting the insulating tube 7 in the direction of arrow A. In this case, since the insulating cylinder 7 has elasticity enough to strongly tighten the insulating spacer 6,
The insulating tube 7 is fitted while rotating about the axis of the cable 1. If the thickness of the insulating cylinder 7 is appropriately selected, the insulating thickness at this connection portion can be secured to a certain value or more.

[0004]

By the way, in the work of fitting the insulating cylinder 7 as described above, the worker moves the arrow A.
It is necessary to rotate the insulating cylinder 7 while applying a force in the direction, and to gradually shift the insulating cylinder 7 in the direction of arrow A. However, when this operation is performed while holding the insulating cylinder 7, pressure is applied in the direction shown by the arrow B, and the frictional force between the insulating cylinder 7 and the insulating spacer 6 is increased, making the fitting work more and more difficult. Become. On the other hand, even if the end portion of the insulating cylinder 7 is grasped and pushed, a force is still applied in the direction of arrow C, and an increase in the frictional force between the insulating cylinder 7 and the insulating spacer 6 cannot be prevented. . Therefore, the above-mentioned fitting work requires a very long time and labor. The present invention has been made in view of the above points, and an object of the present invention is to provide a cable connecting portion that can perform an operation of fitting an insulating tube relatively easily and in a short time.
Another object of the present invention is to provide a cable connecting portion in which the insulating tube fitted in this manner does not subsequently shift in the longitudinal direction due to various stresses.

[0005]

Means for Solving the Problems The first invention of the present invention is a first invention.
Cylindrical insulation space on the connecting conductors of a pair of cables
And the insulation that is slid and mounted on the insulating spacer
At the cable connection section with
To attach the mounting device to the outer peripheral surface of the insulating cylinder.
A plurality of mounting work grooves provided on the outer peripheral surface,
A pressing end surface for sliding, orthogonal to the pressing direction
And a pressing surface composed of a surface to be formed. A second invention according to the present invention is arranged on connection conductors of a pair of cables.
Cylindrical insulating spacer and a sliding member on the insulating spacer.
And the insulation tube fixed to the cable side
A cable connection part provided with a protective case for covering the edge tube.
Then, a mounting device for sliding the insulating cylinder is provided outside the insulating cylinder.
A plurality of mounting works provided on the outer peripheral surface to be mounted on the outer peripheral surface;
And the pressing end face for sliding the insulating cylinder.
The pressing surface consisting of a surface perpendicular to the pressing direction and the protective case.
Movement rule of the insulating cylinder formed inside the
And a control step.

[0006]

[Function] In this cable connection part, the outer peripheral surface of the insulating cylinder is duplicated.
Number of mounting grooves and a pressing end
A pressing surface composed of a surface orthogonal to the direction was formed. These grooves
Attach the mounting device to the pressing surface and apply the mounting device to the
Press the insulation tube. As a result, the insulating cylinder and the insulating spacer
Without increasing the frictional force between them, apply evenly to the insulating cylinder,
It can slide on the insulating spacer.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of a cable connecting portion of the present invention. In the figure, cable insulator 5
Is exposed at the end to expose the conductor 8. The conductor 8 is connected by a compression sleeve 9. An insulating spacer 6 having the same configuration as that described with reference to FIG. 2 is fitted around the outer periphery of the insulator 5. An insulating portion 6A is provided on a side of the insulating spacer 6 near the conductor 8, and a semiconductive portion 6B is provided at both ends. A sleeve cover 11 is placed over the outer periphery of the compression sleeve 9. Then, the insulating cylinder 12 is fitted on the insulating spacer 6 . In the present invention, the insulating tube 12 includes:
In the illustrated embodiment, four annular mounting work grooves 13 are formed on the outer peripheral surface. Each mounting work groove 13
, The installation instrument has a shape of a writing exactly fits 1
4 is fitted. Then, a force is applied to each mounting device 14 in the direction of arrow F shown in the figure, and the fitting operation is performed.

When the insulating cylinder 12 is configured as described above, the direction of the arrow F is applied to the insulating cylinder 12 when the insulating cylinder 12 is fitted.
Direction force is evenly applied to the insulating cylinder 12 and the insulating spacer 6.
The frictional force is not locally increased between the two . Therefore, the fitting operation of the insulating cylinder 12 can be smoothly performed with a minimum force. The mounting groove is preferably annular so that a uniform force can be applied to the insulating cylinder 12 in the longitudinal direction. For example, the mounting groove may be spiral, or may be circumferential. The groove may be discontinuous when viewed. Further, it may be a blind hole-shaped one into which the tip of a rod-shaped mounting tool is fitted. The number may be any number. However, it is preferable to form a groove in the semiconductive portion 12B while maintaining the continuity of the semiconductive portion 12B so as not to deteriorate the insulating characteristics of the insulating cylinder 12.

On the other hand, the end of the insulating cylinder 12 is
A substantially orthogonal pressing surface 12b is formed. In this case, the mounting work groove 13 is formed on the outer peripheral surface of the insulating cylinder 12,
It is preferable that the pressing surface 12b of the insulating cylinder 12 and the mounting work groove 13 are simultaneously pressed by the mounting tool 14. In this way, there is no fear that the force when the end is pushed as shown in FIG. 2 increases the frictional force between the insulating cylinder 12 and the insulating spacer 6.

[0010] In addition to pressing the insulating cylinder 12 in the longitudinal direction by using the mounting work groove 13 provided on the outer peripheral surface thereof as described above, if the insulating cylinder 12 is pressed in the longitudinal direction, the insulating cylinder 12 is pressed by the pressing force. There is no possibility that the cylinder 12 contracts in the longitudinal direction. That is, if the insulating cylinder 12 contracts in the longitudinal direction during the mounting operation, the insulating cylinder 12 may not be restored to the normal shape due to the frictional force between the insulating cylinder 12 and the insulating spacer 6. If the connection portion is formed in such a state, the intended insulation characteristics may not be obtained in some cases. Therefore, as described above, the insulating cylinder 1
2 by applying a uniform force in the longitudinal direction and applying the attaching device 14 so as to prevent the contraction in the longitudinal direction, a cable connection portion having a faithful characteristic as designed can be completed. Also, if the insulating cylinder 12 is fitted by applying an excessive force while rotating it as in the prior art, the insulating cylinder 12 is twisted or distorted, and the adhesion between the insulating cylinder 12 and the insulating spacer 6 becomes uneven. Become. As a result, voids may be formed at the interface between the two, and the electrical characteristics may be degraded. In such a case, the connecting portion of the present invention can be eliminated. In addition, this kind of insulating cylinder 1
2 to prevent the distortion of the sleeve cover 1 shown in FIG.
1 is made to match the outer diameter of the insulating spacer 6. Thereby, the insulating cylinder 12 near the compression sleeve 9 is formed.
Can be suppressed.

FIG. 3 is a longitudinal sectional view of a main part of a cable connecting portion showing another embodiment of the present invention . In the invention shown in the figure, a protective case 15 is provided on the outer periphery of the cable connection portion shown in FIG. 1 to protect them. This protective case 15
In the present invention, the shape of the end cap 17 of the protective case 15 has been devised as a matter of course. That is, the protective case 15 includes a cylindrical portion 16 surrounding the insulating cylinder 12 and end caps 17 provided at both ends. The end of the end cap 17 is fixed to the outer periphery of the sheath 2 of the cable 1 with a sealing tape 18 or the like. On the other hand, each end cap 17
A step is formed at the end on the side of the cylindrical part 16 so as to protrude stepwise inward.
The pressing surfaces 12b at both ends of the insulating tube 12 (see FIG. 1)
) Are facing each other. This allows you to start using
For example , the displacement of the insulating tube 12 in the longitudinal direction due to thermal expansion and contraction of the cable can be restricted .

That is, when the cable 1 is used, it generates heat due to an increase in its transmission current. The connection expands or contracts due to the heat. This force also exerts various effects on the interface between the insulating cylinder 12 and the insulating spacer 6, and the positional relationship between the two may be deviated. For example, when the insulating cylinder 12 is displaced in the longitudinal direction, the initial insulating characteristics cannot be obtained as described above. Therefore, as shown in FIG. 3, the pressing surface of the insulating cylinder 12 is opposed to the step of the protective case 15.
If so that the protective case 15 because it is fixed to the sheath 2 of the cable 1, the movement of the insulating tube 12 is restricted. Thereby, stable characteristics can be maintained for a long time.

FIG. 4 is a longitudinal sectional view of a main part of a cable showing a specific embodiment of the present invention. The present invention is specifically implemented as shown in FIG. The cable connection parts shown in FIGS.
The same parts as those in FIG. 3 are denoted by the same reference numerals. Therefore, although the description of the overlapping part is omitted, as shown in the figure, the semiconductive layer 4 of the cable 1 is provided with a semiconductive tape winding 21 and the semiconductive portion 6B of the insulating spacer 6 is formed on the outer periphery thereof.
Is fitted. A semiconductive portion 7C is also formed inside the insulating cylinder 7, and the sleeve cover 11C is formed.
It is arranged to cover. Further, the semiconductive portion 7B provided on the outer periphery of the insulating cylinder 7 just overlaps with the semiconductive portion 6B of the insulating spacer, and is electrically connected to the shielding layer 3 of the cable 1 by the semiconductive tape winding layer 23.
Further, the cylindrical portion 16 of the protective case 15 is made of a highly conductive metal, and is electrically connected to the shielding layer 3 of the cable 1 by a lead wire 22. The end of the end cap 17 is provided with a contraction tube 24 integrally with the sheath 2 of the cable 1.
Is covered. A shrinkable tube 25 is put over the end cap 17 and the tubular portion 16 for reinforcement. The cylindrical portion 16 is connected to the terminal 2
6 and is electrically connected to a ground terminal outside the connection portion. The present invention is actually implemented with such a configuration. The present invention is not limited to the above embodiments. The cable connection portion may be changed to various well-known configurations such as the conductor connection configuration without any problem. In the invention of FIG.
The pressing surface 12b provided on the insulating cylinder 12 is not necessarily
May be provided only at one end, not at both ends.

[0014]

According to the cable connecting portion of the present invention described above, a plurality of mounting grooves are formed on the outer peripheral surface of the insulating cylinder, and the insulating cylinder is pressed by applying a uniform force in the longitudinal direction using a mounting tool. As a result, the mounting operation can be quickly performed with a minimum force without increasing the frictional force between the insulating cylinder and the insulating spacer. If a pressing surface substantially perpendicular to the cable axis is provided at the end of the insulating cylinder, a similar effect can be obtained by pressing this surface. Furthermore, if the end of the protective case that protects the outer periphery of the insulating cylinder is fixed to the cable sheath, and the pressing surface of the insulating cylinder is opposed to the step of the protective case, the displacement in the longitudinal direction of the insulating cylinder is regulated and the length is reduced. Stable electrical characteristics can be secured over a period.

[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 main part of a conventional general cable connection part.

FIG. 3 is a longitudinal sectional view of a main part of a cable connecting portion showing an embodiment of another invention .

FIG. 4 is a longitudinal sectional view of a cable connecting portion showing a specific embodiment of the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 15/00-15/196

Claims (2)

(57) [Claims] 1. A cable connecting portion comprising : a cylindrical insulating spacer disposed on a connecting conductor of a pair of cables; and an insulating tube slidably mounted on the insulating spacer. A plurality of mounting work grooves provided on the outer peripheral surface for mounting a mounting device for moving the outer peripheral surface of the insulating tube; and a pressing end surface for sliding the insulating tube, the pressing surface being orthogonal to the pressing direction. And a pressing surface comprising a pressing surface. 2. A cylindrical insulating spacer that is disposed on the connection conductors of the pair of cables, the insulating cylinder which is mounted to slide on the insulating spacer, the insulating tube is fixed to the cable side A plurality of mounting work grooves provided on the outer peripheral surface for mounting a mounting device for sliding the insulating cylinder on the outer peripheral surface of the insulating cylinder; A pressing end surface for sliding, a pressing surface formed of a surface orthogonal to a pressing direction, and a step for regulating movement of the insulating cylinder formed inside the protective case so as to face the pressing surface. And a cable connection part comprising: