JPS6029297Y2 - Cable-proof intermediate connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulated intermediate connection portion of a plastic or rubber insulated cable such as a cross-linked polyethylene insulated cable.

The insulated intermediate connection part of conventional plastic or rubber insulated cable cables has an internal semiconducting layer that is connected to the internal semiconducting layer of the cable on the conductor part where the conductor connection parts are sleeve-connected, and an insulation reinforcement that is insulated on top of the internal semiconducting layer. A shielding layer formed by cutting off the shielding layer connected to the cable shielding layer, semiconductive layer, metal shielding layer, etc. is provided on the outside of the shielding layer, and furthermore, a metal pipe made of copper, copper alloy, aluminum, lead, etc. is provided outside the shielding layer. There is a known structure in which a protective tube is provided, the protective tube is filled with a waterproofing mixture, and the peripheral surface of the protective tube is subjected to anti-corrosion treatment.

By the way, since the insulated intermediate connection part having the above structure uses a metal protection tube, it has a large shape and is therefore unsuitable for installation in a narrow trough or the like.

Therefore, in places where the installation space is narrow, instead of using the above-mentioned protective tube, a waterproof protection layer is applied on the cut-edge shielding layer as described above, and then it is surrounded with a heat-shrinkable rubber or plastic tube, and a corrosion-resistant layer and an insulated intermediate connection are used. It is conceivable to make it a division.

However, the heat-shrinkable rubber/plastic tube that forms the anti-corrosion layer suffers from problems such as penetration of water, moisture, gas, etc. depending on the external environment, resulting in deterioration of the insulation properties.

The present invention was developed in view of the above-mentioned points, and it miniaturizes the connection part by using a heat-shrinkable rubber/plastic tube instead of using a metal protective tube for the insulated intermediate connection part of a plastic or rubber insulated capeple. At the same time, we propose an insulated intermediate connection part equipped with a water-blocking type corrosion-resistant layer that can prevent the penetration of moisture, etc., which is a difficult point at this time. A metal water-blocking layer made of a thin metal layer is provided around the outer periphery of the connection section formed by cutting the edges and insulating the layer, and a rubber/plastic corrosion-proofing layer made of a heat-shrinkable rubber/plastic tube is provided on the outside of the metal water-blocking layer. The metal water-blocking layer is characterized in that it is edge-trimmed.

Hereinafter, the insulated intermediate connection portion of the cable according to the present invention will be illustrated in the drawings and explained in detail by way of an embodiment.

Figure 1 is a sectional view of one embodiment of the insulated intermediate connection part of the cable of the present invention, and Figures 2 and 3 are detailed views of the main parts of Figure 1, respectively. Symbols indicate common parts.

In FIGS. 1 to 3, A represents the insulated intermediate connection of the cable of the present invention.

CI, C2 indicate plastic or rubber insulated cables to be connected.

1 is a conductor to be connected, 2 is a conductor connection sleeve for connecting conductor 1.1, 3 is a plastic insulating layer such as cross-linked polyethylene, 4 is an outer semiconducting layer, and 5 is a cable outer shielding layer, which connects the inner and outer wires. Conductive tape layer 51.53 and these layers 51.
53 and a wound layer 52 of copper tape or the like.

Reference numeral 6 denotes the outermost sheath, which in this embodiment is composed of a plastic outer covering layer 61 and a water-blocking layer 62 made of metal such as aluminum or lead provided inside the plastic outer covering layer 61.

Then, the ends of the conductors 1, 1 are compressed and connected by a conductor connection sleeve 2, and an internal semiconducting layer 1a is provided around the compression connection, and an insulating reinforcing body 7 made of crosslinked polyethylene is provided on top of the internal semiconducting layer 1a. In order to constitute a mold intermediate connection part, the shielding layers 5a and 55a on the connection part side are electrically connected to the cable shielding layers 5 and 5, respectively, and are formed in a structure in which edge cutting parts are provided.

The shielding layers 5a and 55a are formed of, for example, copper braided wire.

Furthermore, a protective layer 7a for diameter adjustment made of rubber and plastic tape is provided thereon.

Then, as shown in Figure 3, from the left side, a thin metal tape made of lead, aluminum, copper, etc. is wrapped or vertically attached (
These lapped portions or vertically stacked overlapping portions are bonded with a bonding agent as appropriate.

) A metal water-blocking layer 8 is formed.

This metal water-shielding layer 8 is not formed over the entire axial length of the cable connection part formed as described above;
It is cut halfway to perform the edge cutting process to form an insulated intermediate connection part.

Next, a heat-shrinkable rubber/plastic tube is placed over the water-shielding layer 8 and subjected to post-heat shrinkage to form a rubber/plastic corrosion-resistant layer 9.

Unlike the water-blocking layer 8, this anti-corrosion layer 9 can be provided over the entire length of the connection part.

Further, as shown in FIG. 2, on the corrosion-resistant layer 9, from the right side, the water-shielding layer 8 is provided halfway as described above, until the end overlaps with the corrosion-resistant layer 9, similar to the metal water-shielding layer 8 described above. Then, a metal water-blocking layer 88 is formed, and then, in the same manner as the corrosion-proofing layer 9, a corrosion-proofing layer 99 is formed using a heat-shrinkable rubber/plastic tube.

That is, by forming the water-shielding layer 8.88 made of metal, the water-shielding layer itself is also provided with an edge cut portion C.

Note that the radial thickness of the edge cut portion C conforms to the cable standard, and the axial length is determined by the characteristics of the heat-shrinkable rubber/plastic tube.

Further, in the figure, reference numerals 10 and 100 denote left and right ground terminal tubes electrically connected to the metal shielding layer 5 by lead wires 10a and 110a, respectively, and electrically connected to the metal water shielding layers 8 and 88, respectively.

Furthermore, 8a and 88a are between the water-shielding layer 62 of the cable and the ground terminal tube 10 on the left side of FIG. 1 (FIG. 3) and the first
A metal water-shielding layer equivalent to the aforementioned metal water-shielding layers 8 and 88 provided for water-shielding is provided between the cable water-shielding layer 62 and the ground terminal tube 100 on the right side of the figure (Fig. 2). show.

12 and 120 are waterproof rubber/plastic tape wrapping layers provided across the outermost plastic sheath layer 6 and the ground terminals 10 and 100, respectively, and 121 and 122 are the outermost corrosion-resistant layer 99. This is a layer of waterproof rubber/plastic tape wrapped around both ends and the ground terminal tubes 10 and 100, respectively.

In addition, in forming the metal water-shielding layers 8 and 88 mentioned above, at a predetermined position on the inner surface of the heat-shrinkable rubber/plastic tape,
A composite tube on which a thin layer of metal such as aluminum, lead, copper, etc. is preformed can be used.

In this case, if the shrinkage rate is too large, the water-blocking layers 8, 8 formed
8. Since there will be many wrinkles, choose a size that requires less shrinkage.

In addition, when aluminum, lead, copper, etc. are used in tape form as the metal shielding layers 8.8B, 8a, and 88a, a composite film in which plastic such as polyethylene film or nylon film is laminated on one or both sides of these metal thin tapes is used. , so-called laminate tape can be used.

Also, the other side to be bonded to the metal thin tape or the metal-plastic composite thin tape mentioned above is selected from adhesives such as ethylene vinyl acetate copolymer, ethylene-ethyl acrylate, vinyl chloride vinyl acetate copolymer, nitrile rubber, etc. It is also possible to preliminarily adhere an adhesive selected as appropriate by
It may also be used as an adhesive when forming the metal water-blocking layers 8, 88, 8a, 88a.

Also, the thickness of the metal thin tape made of aluminum, lead, copper, etc. that constitutes the metal water-shielding layers 8, 88, 8a, 88a is 5 μr.
It is preferable to use a material with a range of rL to 500μ.

Further, as the members constituting the anti-corrosion layers 9 and 99, a commonly used heat-shrinkable tube on the market can be used, and it is preferable to use one with a heating temperature of about 40°C to 140°C, as described above, in the cable of the present invention. The insulated intermediate connection of
On the insulation treatment part, a metal water-blocking layer made of a thin metal layer formed to conform to this shape and a rubber/plastic corrosion-resistant layer 9, 99 made of a heat-shrinkable rubber/plastic tube are formed. Therefore, the protection tube is omitted, and the connection part is made more compact.The metal water-blocking layers 8 and 88 provided on the inner circumferential surface of the corrosion-resistant layer are edge-trimmed, so that the insulated intermediate part of the cable is It not only satisfies the characteristics as a connection part, but also has a water-blocking effect.

Therefore, as an insulated intermediate connection part of a plastic or rubber insulated electric cable, there is no ingress of moisture, and deterioration due to this can be prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the insulated intermediate connection part of the cable of the present invention, and FIGS. 2 and 3 are detailed views of the main parts of the A part and the mouth part of FIG. 1. In the figure, A is the insulated intermediate connection part of the cable of the present invention;
1 is a conductor, 2 is a conductor connection sleeve, 3 is a plastic insulation layer, 4 is an outer semiconducting layer, 5 is a cable shielding layer, 5a,
55a is a connecting side shielding layer, 6 is an outermost sheath, 7 is an insulation reinforcement, 8, 88 is a connecting side metal water shielding layer, 9.99 is a rubber layer.
Plastic corrosion-resistant layer, b is the edge cutting part of the shielding layer on the connection side,
C indicates the edge cutting portion of the metal water-blocking layer at the connection portion.

Claims (4)

[Scope of utility model registration request] (1) A metal water shielding layer made of a thin metal layer is formed around the outer periphery of the connection part, which is formed by cutting the edges of the shielding layer that connects to the cable shielding layer and insulating it, and the outside is made of a heat-shrinkable rubber/plastic tube. An insulated intermediate connection part for a cable, comprising a rubber/plastic corrosion-resistant layer, and the metal water-blocking layer is edge-cut. (2) The cable according to claim 1, wherein the metal thin layer is formed by wrapping or vertically attaching a metal tape made of lead, aluminum, copper, etc. Insulated intermediate connection. (3) The above-mentioned thin metal layer may be formed by wrapping a metal-plastic composite thin tape made of lead, aluminum, copper, etc. with a thin plastic layer on one or both sides, or by vertically splicing it. An insulated intermediate connection portion of a cable according to claim (1) of the utility model registration. (4) The above-mentioned thin metal layer consists of lead, aluminum,
The insulated intermediate connection portion of a cable according to claim (1), characterized in that it is formed of a thin layer of metal such as copper.