JPS6015392Y2 - Solderless connection of power cable with water barrier layer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solderless connection part of a water-shielding layer power supply cable.

Recently, a water-shielding power transmission cable has been proposed in which a water-shielding layer is provided around the outer periphery of a cable core.

According to such an electric cable, the water-blocking layer prevents moisture from entering the cable insulator, and the insulation performance of the cable can be significantly improved.

A conventional solderless connection part of such a water-blocking layer power supply cable has a structure as shown in FIG.

That is, by stripping the ends of the water-shielding layer power cables 1, 1' in stages, the cable-shielding metal layers IB, IB', the cable water-shielding metal layers IC, IC',
The cable insulation layer (having an inner conductive layer on its inner surface and an outer conductive layer on its outer surface, not shown) ID, ID', cable conductors IE, IE' are sequentially exposed, and cable conductors 1E, IE' are exposed in sequence. They are integrally compressed and connected at a cable conductor connection section 2 using a compression sleeve.

A half-split cylindrical cover is placed on the outer periphery of the cable conductor connection portion 2, and insulating spacers 4, 4' are placed on the outer periphery of the cable insulation layers ID and ID' adjacent to the half-split cylindrical cover 3.
is fitted so that it has the same outer diameter as the half-split cylindrical cover 3.

The insulating cylinder 5 is fitted so as to be inscribed on the outer periphery of the insulating spacer 4, the half-split cylindrical cover 3, and the insulating spacer 4'.

This insulating cylinder 5 has a three-layer structure, with a conductive layer 5B made of conductive rubber or plastic on the inside of a protective layer 5A, and an insulating layer 5C made of rubber or plastic on the inside. Grounding rings 5D and 5D' are respectively attached, and both grounding rings 5D and 5D' are connected to each other by a grounding line 5E disposed within the conductive layer 5B.

Both ends of the insulating tube 5 and both cable sheaths 1A, IA'
A rubber bush 6.6' is fitted between the two for sealing.

A grounding spring 7.7' is attached to each rubber bush 6.6', and this grounding spring 7.7' causes the grounding ring 5 to
D, 5D' and cable shield metal layers IB, IB' are connected.

Thereby, both cable shielding metal layers 1B and IB' are connected via the ground spring 7, the ground ring 5D, the ground wire 5E, the ground ring 5D', and the ground spring 7'.

Heat-shrinkable tubes 8, 8' are tightly coated over the cable sheaths IA, IA' and the protective layer 5A on both sides of each rubber bushing 6,6'.

This kind of solderless connection does not use solder, so
It does not require any skill and can be formed efficiently.

However, such a structure has the disadvantage that its water-shielding performance is inferior to that of the cable side, and it tends to lead to a decrease in insulation performance.

An object of the present invention is to provide a solderless connection part for a water-blocking layer power capacitor that can improve water-blocking performance.

In the solderless connection part of the water-blocking layer power supply cable according to the present invention, a cylindrical water-blocking cover made of thin metal is built in the insulating cylinder along its longitudinal direction, and the flexible cylindrical parts at both ends of the cover are connected to the insulating cylinder. The flexible cylindrical portions at both ends of the water-shielding cover are overlaid and closely attached to the exposed portion of the cable water-shielding metal layer via an adhesive layer, and a tightening member is attached to the overlapping portion. It is characterized by the fact that

An embodiment of the present invention will be described in detail below with reference to FIG.

The solderless connection portion of the water-blocking layer power supply cable of this embodiment is characterized by the insulating tube 5.

That is, this insulating cylinder 5 has a conductive layer 5B made of conductive rubber/plastic on the inside of the protective layer 5A, and a conductive layer 5B made of conductive rubber/plastic on the inside thereof.
It has an insulating layer 5C made of plastic, and ground rings 5D and 5D' are attached to both ends of the conductive layer 5B, respectively.
Both ground rings 5D.

5D' are connected to each other by a ground wire 5E disposed on a groove provided in the conductive layer 5B, and a cylindrical water-shielding cover 5F made of thin metal is built into the conductive layer 5B along its longitudinal direction. , flexible cylindrical part 5F1.5F at both ends thereof
2 protrudes from the inner surface of the insulating cylinder 5.

The water-shielding cover 5F has a laminate structure in which conductive rubber/plastic layers 10 are laminated on both sides of a thin metal 9, as shown in FIG. 3, for example.

The thin metal 9 is made of lead or aluminum with a thickness of 0.05 mm or more.
It is preferable to form it with a thickness of about 0.177171 mm.

This thickness provides the necessary flexibility.

Flexible cylindrical portions 5F1 at both ends of the water-blocking cover 5F.
5F2 has an adhesive layer 1 on the cable water-shielding metal stepped layers IC and IC' at the ends of both water-shielding power supply cables 1 and 1.
1.11' and are closely attached to each other, and a tightening member 12.12' is fitted thereon for tightening.

Ring-shaped molded bodies made of elastic rubber or plastic are suitable for the tightening members 12, 12', but they may also be divided in the circumferential direction and connected to each other.

The other parts are constructed almost the same as that shown in FIG.

Note that the thin metal layer is not built into the conductive layer 5B;
It may be built in at the interface between and the insulating layer 5C or in the insulating layer 5C.

As explained above, the solderless connection part of the water-shielding layer power supply cable according to the present invention has a cylindrical water-shielding cover built into the insulating cylinder, and the flexible cylindrical parts at both ends protrude into the insulating cylinder. Since it is superimposed on the water-shielding metal layer via the adhesive layer and tightly attached with the tightening member, the water-shielding performance of the connection portion is improved, and the insulation performance can be significantly improved.

In addition, in the present invention, the flexible cylindrical portions at both ends of the water-shielding cover need only be superimposed on the cable water-shielding metal layer via the adhesive layer and brought into close contact with each other, so on-site work is simple.

Furthermore, since the work can be performed in the same way as the conventional connection method, it has the advantage of being highly adaptable to the site.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional solderless connection part, FIG. 2 is a longitudinal sectional view of an embodiment of the solderless connection part according to the present invention,
FIG. 3 is a sectional view showing an example of a laminate structure forming a water-shielding cover. 1.1'...Water shielding layer power capeple, 1A, I
A'...Cable sheath, IB, IB'...
...Cable shielding metal layer, IC, IC'...
Cable water-shielding metal layer, ID, ID'...Cable insulation layer, IE. IE'...Cable conductor, 2...Cable conductor connection portion, 3...Cover, 4. 4'・
...Insulation spacer, 5...Insulation cylinder, 5A
...Protective layer, 5B...Curved groove electric layer, 5C...
...Insulating layer, 5D, 5D'...Grounding ring, 5
E...Grounding wire, 5F...Waterproof cover,
5Fl-5F2...Flexible cylindrical part, 6.
6'...Rubber butt, 7,7'...
・Grounding spring, 8, 8'...Heat shrink tube, 1
1.11'... Adhesive layer, 12.12'...
...Tightening member.

Claims (1)

[Scope of utility model registration request] Both cable cables with a water-blocking layer, which have a cable water-blocking metal layer in addition to a cable shielding metal layer on the outer periphery of the cable insulating layer, are stripped at the connecting end to expose each layer, and the cable conductors of both cables are They are connected to each other at a cable conductor connection part, a cover is attached to the outer periphery of the cable conductor connection part, and insulating spacers are respectively provided on the cable insulation layers on both sides of the cover so as to have the same outer diameter as the cover. An insulating cylinder is attached that inscribes and surrounds the outer periphery of the cover and both of the insulating spacers, and the insulating cylinder has a conductive layer inside a protective layer and an insulating layer inside the protective layer, Grounding rings are attached to both ends of the layer, and the grounding rings are connected to each other by a grounding wire passing through the conductive layer. At the connecting portion of the water shielding layer power cable, in which the rubber bushings are fitted and sealed, and the grounding ring and the cable shielding metal layer are connected by a grounding spring, the insulating cylinder has a thin wall along the longitudinal direction. A cylindrical water-shielding cover made of metal is built-in, and flexible cylindrical parts at both ends of the water-shielding cover protrude from the inner surface of the insulating tube, and each flexible cylindrical part is connected to the cable shield on each side. A solderless connection part of a water-shielding layer power supply cable, characterized in that the exposed part of the water metal layer is overlaid and closely adhered to the exposed part of the water metal layer via an adhesive layer, and a tightening member is attached to each of the overlapping parts.