JP2547599Y2 - Cable termination - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to the improvement of the cable end portion, and particularly to a cable which facilitates and assembles easily and particularly enhances the protection of the insulating cylinder covering the conductor connection terminal. Regarding the terminal part.

(Prior Art) When cables are connected to each other in a straight line or connected to an electric device, terminal processing for conductor connection and fitting is performed at the cable end.

FIG. 3 shows a longitudinal sectional view of a conventional cable terminal portion. This cable termination is formed to connect a 6.6KV high-voltage bypass CV cable (crosslinked polyethylene insulated cable) to the termination box.

In the figure, a conductor connection terminal 3 is fixed to a tip of a cable conductor 2 of a CV cable 1 which has been stripped off by a method such as compression connection. Further, a semiconductive rubber layer 5 is formed so as to cover the vicinity of the end of the cable insulator 4 and a part of the conductor connection terminal 3.

Further, an insulating cylinder 7 is formed in a tapered shape so as to cover most of the insulator 4, the semiconductive rubber layer 5 and the conductor connection terminal 3. The insulating cylinder 7 is formed by molding EP rubber (ethylene propylene rubber).

On the conductor connection terminal 3 side of the insulating cylinder 7, an insertion hole 7a that expands in a tapered shape is formed, and a mating connection terminal (not shown) is fitted therein. A metal connection tube 6 is integrally fixed to an outer peripheral portion of the insertion hole 7a of the insulating tube 7. The metal connection tube 6 is fastened and fixed to a counterpart connection tube (not shown) by a connection nut 6a.

On the insulating cylinder 7, a shielding layer 9 is formed by winding a semiconductive EP rubber tape from the cable side end of the metal connecting cylinder 6 to the semiconductive layer 8. Further, a lead wire 11 is provided for electrically connecting the metal connection tube 6 and the shielding layer 10.

This terminal portion is connected to the outermost periphery from the metal connection tube 6 to the cable 1.
Over the end of the sheath 1a to protect the whole
Are formed. The protective layer 12 is formed by a chloroprene rubber mold or the like.

The semiconductive rubber layer 5 is provided to reduce the electric field near the connection between the conductor connection terminal 3 and the cable conductor 2, and the shielding layer 9 is provided to make the electric field inside the insulating cylinder 7 uniform. ing.

(Problems to be Solved by the Invention) By the way, the lead wire 11 shown in FIG. 3 electrically connects the metal connection tube 6 and the cable shielding layer 10 with a low resistance to secure the shielding of the terminal portion.

FIG. 4 is an enlarged view of a connection portion between the lead wire 11 and the metal connection tube 6.

As shown in the figure, a step portion is provided at the end of the metal connection tube 6 on the cable side.
6a is formed, and the lead wire 11 is connected by soldering here. Conventionally, the soldering of the lead wire 11 has been performed prior to the molding of the protective layer 12 after forming the shielding layer 9 on the outer periphery of the insulating tube 7.

However, at this time, the step 6a is caused by the heat of soldering.
The temperature may be as high as 200 ° C or higher. In this case, deformation occurs in the portion 7b of the insulating cylinder 7 which is in contact with the step 6a, and partial separation from the step 6a occurs. If the cable end is used in such a state, there is a problem that the electric field concentrates on the deformed portion 7b, and the electrical characteristics of the insulating cylinder 7 deteriorate due to corona discharge. Also, the metal connection tube 6 assembled at the cable end
Performing the above soldering operation also has a problem that workability is deteriorated.

In order to solve such a problem, it is conceivable to solder the lead wire 11 to the metal connection tube 6 in advance, and then integrate the metal connection tube 6 and the insulating tube 7 by molding.

However, in this case, the lead wire
11 must be retracted outside the mold. Therefore, there has been a problem that the structure of the mold becomes complicated and expensive. In addition, there is a problem that the workability of the molding operation is complicated.

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 terminal portion that enables connection between a lead wire and a metal connection tube without deterioration of an insulation tube and further facilitates assembly thereof. It is the purpose.

(Means for Solving the Problems) The cable end portion of the present invention is composed of a conductor connection terminal fixed to the end of a cable conductor of a rubber-plastic cable that has been stripped, a vicinity of the end of the cable conductor, and the conductor connection terminal. An insulating tube arranged so as to surround, a metal connecting tube that covers an outer periphery of the insulating tube near the conductor connection terminal, and a lead wire that electrically connects the stepped-off cable shielding layer and the metal connecting tube. The one end of the lead wire is connected and fixed to a metal tube fitted to the metal connection tube.

Further, the present invention provides a conductor connection terminal attached to a cable conductor of a rubber-plastic cable that has been stripped off,
An insulating tube covering the cable insulating layer and the conductor connection terminal near the cable conductor, a metal connecting tube provided on the insulating tube, and a cable shielding layer on the cable insulating layer for electrically connecting the cable connecting layer to the metal connecting tube. In the cable terminal portion including the lead wire, the insulating tube is molded integrally with the metal connection tube, and has a metal tube to which the lead wire is soldered in advance and fitted to the metal connection tube. It is characterized by the following.

(Operation) Lead wires are soldered to the metal tube in advance. Therefore, by fitting the metal tube to the metal connection tube, the insulation tube in contact with the metal connection tube is not deteriorated by the thermal influence of soldering, and the molding operation of the insulation tube and the shape of the mold are complicated. Without this, the cable shielding layer and the metal connection tube can be electrically connected.

The metal tube is fitted into the metal connection tube, and fitted by screwing, caulking or the like.

(Embodiment) Hereinafter, the present invention will be described in detail with reference to the embodiment shown in the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a cable terminal portion of the present invention.

The cables shown in the figure are similar to those shown in Fig. 6, for example.
Shows the end of the 6KV bypass CV cable. In FIG. 1, the same parts as those in FIG. 3 are denoted by the same reference numerals, and the description of the same components will be omitted.

FIG. 4 is an enlarged view of a main portion (a portion surrounded by a circle C in FIG. 1) of the metal connection tube 6 which is a characteristic portion of the cable terminal portion of the present invention.

As shown in the figure, a step 6a is provided at the end of the metal connection tube 6 on the cable side, and a metal tube 13 is fitted and fixed thereto. The metal tube 13 has a step 13a, to which the lead wire 11 is connected in advance by soldering or the like.
Further, the metal tube 13 is provided with a through hole 14 so that the metal connection tube 6
Is fixed by screwing the screw 14a.

The cable terminal portion of the present invention having the above-described structure is formed as follows.

That is, first, as shown in FIG. 1, the insulator 4, the semiconductive layer 8, the shielding layer 10, and the cable sheath 1a of the CV cable 1 are sequentially peeled off. Then, the conductor connection terminal 3 is compression-connected to the cable conductor 2. Further, a semiconductive rubber layer 5 is formed in a conical shape from the surface of the cable insulator 4 to the surface of the conductor connection terminal 3 by a semiconductive EP rubber mold. Next, an insulating cylinder 7 is formed thereon by an EP rubber mold. The metal connection tube 6 is integrally bonded and fixed to the outer periphery of the insulating tube 7.

Next, a semiconductive EP rubber tape is wound around the outer periphery of the insulating cylinder 7 from the cable side end of the metal connection cylinder 6 to the semiconductive layer 8 to form a shielding layer 9. This shielding layer 9 is, for example,
Apply 25mm thick semiconductive self-fusing tape to the step of metal connection tube 6.
1a reciprocating winding of 1/2 lap from 6a to the tapered falling portion of the insulating cylinder 7, and furthermore, a 0.4 mm thick semiconductive rubber tape is similarly wound from the tapered surface of the insulating cylinder 7 to the cable semiconductive layer 8. I do.

On the other hand, the metal tube 13 shown in FIG. 2 is inserted into the cable 1 in advance. Then, three lead wires 11 are connected to the stepped portion 13a of the metal tube 13 at three places on the periphery by soldering. As the lead wire 11, a 3.5 mm ² tin-plated soft copper braided wire is used. Next, after the formation of the shielding layer 9, the metal tube 13 to which the lead wire 11 is connected is fitted to the step 6 a of the metal connection tube 6. Screw holes provided at two places on the outer periphery of the metal tube 13
Insert the stainless steel screw 14a into the metal connection tube 6
And the metal tube 13 are integrally fixed.

The lead wire 11 connected to the metal tube 13 is disposed along the shielding layer 9 so as to be slightly wound. For example, the shielding layer 10 of the cable 1 composed of a braided wire has three braided wires.
It is equally divided and connected to the three lead wires 11 by soldering.

After these operations, a protective layer 12 is formed from the step of the metal tube 13 to the end of the cable sheath 1a so as to cover the shielding layer 9 and the lead wire 11. This protective layer 12 is formed of chloroprene rubber or the like.

Incidentally, the protective layer 12 covering the vicinity of the end portion of the cable sheath is formed of the third layer.
The thickness is slightly thicker than the conventional one shown in the figure, and a plurality of annular grooves 12a are formed on the outer periphery thereof. Further, the annular groove 12a is formed so as to gradually become shallower as approaching the side toward the metal connection cylinder 6.

By forming the protective layer 12 in this manner, bending stress is widely dispersed in a certain area of the annular groove 12a, and a part is not sharply bent. Thereby, the occurrence of cracks in the protective layer 12 and the insulating cylinder 7 can be effectively prevented.

In the above embodiment, an example has been described in which the screw hole 14 is provided in the outer peripheral portion of the metal tube 13 and the metal tube 13 is fixed using the metal connection tube 6 and the screw 14a.

However, the present invention is not limited to this, and any method may be used as long as it does not adversely affect the insulating cylinder 7 inscribed in the metal connecting cylinder 6. Absent. For example, the metal tube 13 may be screwed into the metal connection tube 6. Also, the present invention is a CV
The present invention can be widely applied not only to power cables such as cables, but also to rubber and plastic cable terminations that need to ground the shielding layer.

(Effects of the Invention) The cable termination section of the present invention described above is configured such that the connection between the metal connection tube and the lead wire for grounding the metal connection tube is made via a metal tube, so that heat such as soldering is applied to the metal connection tube. And the thermal deterioration of the insulating cylinder can be prevented. In addition, by connecting the lead wire to the metal tube in advance, the assembling work of the terminal portion can be simplified. Moreover, this does not significantly change the appearance of the conventional cable termination.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a cable terminal section of the present invention, FIG. 2 is an enlarged view of a main part thereof, FIG. 3 is a longitudinal sectional view showing an example of a conventional cable terminal section, and FIG. It is the principal part enlarged view. DESCRIPTION OF SYMBOLS 1 ... Cable, 1a ... Cable sheath, 2 ... Cable conductor, 3 ... Conductor connection terminal, 4 ... Insulator, 5 ... Semiconductive rubber layer, 6 ... Metal connection tube, 7 ... Insulation tube , 8 ...
Semiconductive layer, 9,10 ... Shielding layer, 11 ... Lead wire, 12 ... Protective layer, 13 ... Metal tube.

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-140618 (JP, A) JP-A 57-141624 (JP, U) JP-A 62-177235 (JP, U) 28693 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A conductor connecting terminal attached to a cable conductor of a rubber-plastic cable stripped from a step, an insulating tube covering the cable insulating layer near the cable conductor and the conductor connecting terminal, and provided on the insulating tube. In a cable terminal portion including a metal connection tube and a lead wire for electrically connecting a cable shielding layer on the cable insulating layer to the metal connection tube, the insulation tube is molded integrally with the metal connection tube. And a metal tube having the lead wire soldered in advance and fitted to the metal connection tube.