JPS5832453Y2 - power cable junction box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power cable connection box, and more particularly to an improvement in the connection between a connecting conductor connected to a core conductor of a power cable and an internal electrode of an insulator.

A power cable junction box has a connecting conductor connected to the core conductors of two power cables, an internal electrode electrically connected to the connecting conductor and exposed on the inner surface, and an external electrode exposed on the outside surface. It includes an insulator surrounding the conductor and the connecting conductor, and a stress cone pushed between the insulating layer of the power cable and the insulator.

The connecting conductor has a connecting portion including a stopper against which the annular protruding portion of the internal electrode of the insulator abuts, and a threaded portion into which a tightening fitting is screwed to tighten the annular protruding portion of the internal electrode toward the stopper. The internal electrode is electrically connected to the connecting conductor by this connecting portion.

However, with this structure, if the fastener loosens, the electrical contact between the connecting conductor and the internal electrode is broken due to the pressing force of the stress cone, and a potential difference is generated between the connecting conductor and the internal electrode, causing a discharge between them. The purpose of this invention is to provide an electric current that prevents electrical disconnection between the connecting conductor and internal electrodes even if the fastening fittings become loose. Our purpose is to provide a cable connection box.

The embodiments of the present invention will be described in detail with reference to the drawings.
The figure shows a power cable connection box 10 according to the present invention, which mechanically connects the core conductors 1a#1'a of the power cable 1#1' to each other and connects these core conductors. A connecting conductor 12 to be electrically connected, an insulator 14 made of a cylindrical epoxy resin molded body surrounding the core conductor 1asl'a and the connecting conductor 12, and a power cable 1.
The stress cone 16, 16' is provided between the insulating layer 1btl'b of 1' and the insulator 14.

Embedded in the insulator 14 are an annular inner electrode 18 exposed on the inner surface and two annular outer electrodes 20 and 20' exposed on both ends of the outer surface.

In the illustrated embodiment, the connecting conductor 12 includes a sleeve portion 22 with an H-shaped cross section that is fitted across both the core conductors 18 and 1'a of the two power cables 1 and 1', and a sleeve portion 22 that is fitted over both the core conductors 18 and 1'a of the two power cables 1 and 1'. annular protrusion 18 of internal electrode 18 of insulator 14;
The connecting portion 28 includes a stopper 24 which abuts against the stopper 24, and a threaded portion 26 into which a tightening fitting 30 which tightens the annular protrusion 18a toward the stopper 24 is screwed.

As shown in FIG. 2, the sleeve portion 22 of the connecting conductor 12 is pressurized and compressed onto the core conductors 1a*1'a to mechanically connect them to each other and to connect these core conductors 1a*1'a. electrically connected.

The insulator 14 abuts the stopper 24 of the connecting conductor 12 at the annular protrusion 18a of the internal electrode 18, and the fastening fitting 30 is screwed into the threaded part 26 within the inner space of the internal electrode 18 using a suitable jig. The internal electrode 18 is connected to the core conductor 1a via the connecting conductor 12.
It is electrically connected to sl'a.

The stress cones 16, 16' have their outer inclined surfaces pressed against the inner circumferential tapered surface of the insulator 14 with a predetermined surface pressure, and their inner circumferential surfaces are pressed against the insulating layers 1b, 1'b of the power cables 1, 1' with a predetermined surface pressure. Stress cone holding fittings 32.32' so that they collide with surface pressure.
These stress cone retainers 32, 32' are pressed by springs 36, 36' to adapters 34, 34' attached to the external electrodes 20, 20'.

Cable protection fitting 38.38' is adapter 34.34
The external electrode 20.20' is connected between the power cable I11' and the power cable I11'.

In addition, in FIG. 1, the reference numbers 40 and 40' indicate the adapter
．． Use the waterproof tape wrapped between 34' and cable protection fitting 38.38'! a, 42°42'
is cable protection fitting 38.38' and power cable 1
, 1'.

A conductive O-ring 4 is disposed between the outer peripheral surface of the connecting portion 28 of the connecting conductor 12 and the inner peripheral surface of the annular protrusion 18a of the internal electrode 18.
4 is placed.

In the illustrated embodiment, an O-ring 4 is provided on the outer peripheral surface of the connecting portion 28.
An annular groove 28a is provided in which the O-ring 4 is housed.
4, when the annular protrusion 18a is tightened by the fastening fitting 30, the O-ring 44 is plastically or elastically deformed to frictionally connect the annular protrusion 18a to the connection part 28.

Therefore, even if the fastener 30 becomes loose, the stress cone 16.
The annular protrusion 18a of the internal electrode 18 is not mechanically or electrically separated from the connecting portion 2B due to the pressing force of the inner surface 16'.

O-ring 44 can be metal, such as copper, or conductive rubber.

The annular groove 28a that accommodates the O-ring 44 is the annular protrusion 1.
It may be provided at 8a.

In the above embodiment, the connecting conductor 12 is the core conductor 1a*1'
Although it is compression-connected to the core conductor 1a*1'a, it may be integrally welded with the welding part that connects the core conductor 1a*1'a, or it may be compression-connected across the welded part of the core conductor 1asl'a. good.

According to the present invention, the internal electrode of the insulator is mechanically and electrically connected to the connecting conductor by deforming the conductive O-ring when the tightening fitting is tightened. Even if the internal electrode and the connecting conductor are loosened, the internal electrode and the connecting conductor are not electrically separated, so that an electrical cable junction box that is always stable without causing electrical breakdown can be provided.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of half of the power cable connection box according to the present invention, Fig. 2 is an enlarged cross-sectional view showing the relationship between the core conductor, the connecting conductor, and the internal electrode, and Fig. 3 is the main feature of the present invention. FIG. 1.1'... Electric cable, ia, i'a...
... Core conductor, ib, i'b ... Insulating layer,
1o...Electric cable connection box, 12...
・Connection conductor, 14...Insulator, 16, 16'
...... Stress cone, 18... Internal electrode, 18a... Annular protrusion, 20°20'...
---External electrode, 24----Stock bar 126
...Threaded part, 28... Connection part, 30.
...Bracket fitting, 44...Conductive O-ring.

Claims (1)

[Scope of utility model registration request] A connecting conductor connected to the core conductors of the two power cables, an internal electrode electrically connected to the connecting conductor and exposed on the inner surface, and an external electrode exposed on the outer surface are embedded, and the core conductor and the connecting conductor are buried. and a stress cone pushed between the insulating layer of the power cable and the insulator, and the connecting conductor has a stopper with which an annular protrusion of the internal electrode of the insulator abuts. A power cable connection box having a connection part including a threaded part into which a fastening fitting is screwed to tighten the annular protrusion of the internal electrode toward the stopper is pressed, and the outer circumferential surface of the connecting conductor and the annular protrusion are connected to each other. A power cable connection box with a conductive 0-IJ ring placed between the inner peripheral surface of the