JPS5935510B2 - insulation cover - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an insulating cover for a wire connection part.
In particular, the present invention provides an insulating cover that is adaptable to wire connection parts of different sizes and shapes.

In recent years, to prevent danger, insulated wires with an insulation coating layer have been used instead of the traditional bare wires for overhead power lines.
In order to insulate the branch portions (connections) of the insulated wire, there is a need for an insulating cover that is compatible with various sizes and that can be easily made watertight. However, the insulating covers conventionally used for this type of application are, for example, a split type molded from polyethylene resin, and a sheet type made from polyethylene resin or ethylene-propylene terpolymer sheet or tape coated with an adhesive substance on one side. Or most of them are in the form of tape. However, the former type, that is, the split type, requires coating on the wire connection part and wrapping the end with insulating tape such as adhesive polyvinyl chloride tape, making the wrapping work complicated. However, since the main purpose of the split-type type is to prevent external objects from coming into contact with the wire connection area and becoming charged, it has the disadvantage that it has almost no watertightness. There is.

In addition, when installing the latter, that is, adhesive sheet or tape-shaped products, a tape-shaped viscoelastic sealing material is wrapped around the connection part and the exposed conductor part, and then the adhesive sheet or tape-shaped material is wrapped on top of this sealing material. The wrapping process is complicated and requires a high level of skill on the part of the operator, but the finished product is generally uneven and cannot be sufficiently watertight. The disadvantage is that it is difficult to retain the sex for a long period of time.

In view of the actual state of the prior art, the present inventors investigated various types of wire connections, and found that the wire connection can be wrapped with a simple operation even in connection portions of different sizes, and has watertightness and good self-retention properties. This led to the invention of an insulating cover for parts, the gist of which is a cover in which a bonding adhesive layer is provided on one entire surface or a desired end surface of a flexible, approximately rectangular substrate. a main body, a press-deformable viscoelastic sealing layer that seals electric wires formed on both end area surfaces of the main body to protrude from the edge of the main body, and sealing between the electric wires formed on at least one surface of the sealing layer. a viscoelastic seal protrusion that can be deformed by pressure, and an elastic body that has an adhesive function that wraps around an electric wire connection part that is fixed and protrudes from the edge of the main body at an intermediate part between the sealing layers of the main body. It consists in being.

The insulating cover for wire connections of the present invention is wrapped around the wire connection portion in the manner of sushi rolls, and therefore the substrate constituting the cover has appropriate flexibility and shape retention. Molded to an appropriate thickness using resin or rubber.

The resins or rubbers constituting the substrate include polyethylene resin, polypropylene resin, polystyrene resin, A
Resins such as BS resin or rubbers such as butyl rubber and ethylene-propylene terpolymer are used.

However, from the viewpoint of electrical properties, moldability, etc., a substrate formed by molding polyethylene resin is particularly preferable.
In addition, the polyethylene resin may include polyolefin resins other than polyethylene resin, such as ethylene monovinyl acetate copolymer, ethylene monovinyl chloride copolymer, ethylene-acrylic acid copolymer, and ethylene-acrylonitrile copolymer.
The substrate is molded from a mixture containing one or more synthetic rubbers selected from the group of synthetic rubbers such as butyl rubber and ethylene-propylene terpolymer, or a substrate is formed by combining a polyethylene resin layer and a layer made of the mixture. Molding is preferable because it has more flexibility than a substrate molded from resin or rubber alone, can be easily wrapped around electric wire connections, and can maintain watertightness over a long period of time.

However, it is preferable to crosslink the substrate constructed as described above with an electron beam, ionizing radiation such as gamma rays, peroxide, or the like, since a product with even better heat resistance can be obtained.

The circuit board constructed as described above includes figures 1 and 2A,
As shown in FIG. B, a function that can be wrapped around an electric wire connection part is provided.

In the drawings, reference numeral 1 denotes a substantially rectangular substrate, and the substrate 1 is made of the above-mentioned material or a composite material, and its thickness is preferably 0.3 to 3 mm from the viewpoint of voltage resistance and deformation under pressure. ing. Reference numeral 2 denotes a bonding adhesive layer provided on the entire surface of one side of the substrate 1, and the layer 2 preferably has a thickness of 0.04 to 0.30 m11 made of a mixture mainly composed of rubber and/or synthetic resins.
The cover body S is formed by applying the coating to a thickness of .

3 and 3' are press-deformable sealing layers formed on both end areas of the cover body S on which the adhesive layer 2 is formed, and the layers 3 and 3' are made of butyl rubber, urethane rubber, silicone rubber, ethylene-propylene. A rubber sealing material such as terpolymer rubber thiol is preferably formed to have a thickness of 5 to 30 mm, more preferably 10 to 20 mm.

When the insulating cover of the present invention is wrapped around the wire connection portion 5 in the shape of a sushi roll, the layers 3 and 3' are deformed by viscous flow when pressed from the surface of the substrate 1, and the wires located at both ends of the connection portion 5 are deformed by viscous flow. The H1 hexagram and the electric wire H2 are completely sealed (see FIGS. 4 and 5). However, if the layers 3 and 3' are gradually thinned toward one end of the cover body S as shown in the example of FIG. ．． The overlapping part of the substrate 1 when rolled into sushi does not become bulky, and the adhesive layer 2 can be easily adhered to the surface of the substrate 1, and there is no step between the adhesive layer 2 and the adhesive layer 2, so that good watertightness is achieved. This is preferable because it can be sealed in a closed state. The ends 3a, 3/b of the layers 3, 3' must be formed to protrude from the ends of the cover main body S as shown in FIG. Like electric wire connection part 5
When wrapping the seal layer ends 3a, 3'b on the electric wire Hl
, HlVC. It has the advantage of being easy to work with since it can be wrapped after being bent and glued. 3, 3 are viscoelastic seal protrusions provided on the surface of the seal layer 3, and the protrusions 3
By attaching a VC between the electric wires H and H2 as shown in FIG. 3, the workability during the winding operation and the sealing effect are improved.

That is, by attaching the sealing protrusion 3 between the electric wires H and H2, it is possible to omit the complicated work of pressing and deforming the sealing layer 3 at the time of winding and forcibly sealing it between the electric wires. This ensures secure sealing. Preferably, the sealing protrusion 3 is made of the same material as the sealing layers 3, 3'.
An electric wire connection portion 5, which is one of the important elements of the present invention, can be wound approximately in the middle of the sealing layers 3 and 3'.
An elastic body 4 having an adhesive function for wrapping around the cover body S is fixed to the adhesive layer 2 and protrudes from the edge of the cover body S. The elastic body 4 is made of a base 41 having elasticity such as a rubber block and/or a synthetic resin foam, felt, or thick nonwoven fabric, or a swingable material such as a non-VC or unvulcanized rubber mixture or a pressure-sensitive adhesive composition. It is preferable to apply the adhesive layer 42, but the mixture, composition, or asphalt alone or bituminous material added with a tackifying resin may be impregnated (including rubbed) into the substrate 41, or Coating and impregnating methods may be used in combination, and it is sufficient that the base body 41 is adhered to the wire connection portion 5 using an adhesive substance.

Further, the protruding portion 4' of the elastic body 4 connects the cover to the connecting portion 5.
By using the adhesive force of the protruding portion 47 to temporarily attach and detach the cover from the connecting portion 5 when wrapping it around the connecting portion 5, the cover can be positioned.
This is easy because it can be done with the cover fixed in place. Since the elastic body 4 wraps around the wire connection portion 5, it is preferable to use a rubber or synthetic resin foam material as the base body 41, which has a high recovery property against compression.

In the above description, the cover body S in which the adhesive layer 2 is formed on the entire surface of the substrate 1 is used.
The adhesive layer 2 is not provided on the entire surface of the substrate 1, but is formed only on the desired end surface of the substrate 1 as shown in FIG. It may be fixed to the surface of the substrate 1'' at the position using adhesive means such as an adhesive. Since the insulating cover for the wire connection part of this invention is constructed as described above, 1) the sealing protrusion piece is inserted between the wires, and the protruding part of the elastic body is adhered to the wire connection part, and then it is shaped like a sushi roll. By wrapping it around the wire, adhering the bonding adhesive layer to the surface of the substrate, and pressing the viscoelastic sealing layer portion from the surface of the substrate, the area between and around the wires can be reliably sealed. It can be wrapped with
Sufficient watertightness can be obtained.

) Since the electric wire connection part is wrapped around the inner surface of the cover by an elastic body having an adhesive function, the cover will not slip off due to its own weight even if the connection part is placed over a sloped area.

) Since the connection part is rolled up by the deformation of the elastic body that has an adhesive function, it can be adapted to various connection parts of different sizes.Therefore, one type of insulating cover can be used for a variety of connection parts. It enables mass production of one type of product, and the manufacturing effect is significant.

It has the following characteristics.

[Brief explanation of the drawing]

Figure 1 is a plan view showing an actual example of this invention, and Figure 2A is a plan view showing an example of the invention.
The figure is a cross-sectional view taken along the I-1' line, Figure 2 B is a cross-sectional view taken along the -5 line, and viewed from the direction of the arrow, and Figure 3 is the insulating cover of the present invention used immediately before wrapping a wire connection part. 4 is a partial perspective view showing the state in which the insulating cover of the present invention is used; FIG. 5 is a sectional view of FIG. 4 taken along line -1 and viewed from the direction of the arrow; FIG. FIG. 7 is a plan view showing another example of the invention. 1...Substrate, 2...Adhesive layer for bonding, 3
, 3′... Viscoelastic sealing layer, 3〃, 3〃...
... Viscoelastic seal protrusion piece, 4 ... Elastic body having adhesive function, 41 ... Protruding portion of elastic body, 5.
...Wire connection section.

Claims (1)

[Scope of Claims] 1. A cover body in which a bonding adhesive layer is provided on one entire surface or a desired end surface of a flexible substantially rectangular substrate, and a cover body having a bonding adhesive layer provided on both end areas of the body and protruding from the edges of the body. a press-deformable viscoelastic sealing layer for sealing the electric wires formed by the above-mentioned body; a press-deformable viscoelastic sealing piece for sealing between the electric wires formed on at least one surface of the sealing layer; An insulating cover for an electric wire connection part, comprising an elastic body having an adhesive function to wrap around an electric wire protruding from the edge of the main body and fixed to the intermediate part between the sealing layers. 2. The insulating cover according to claim 1, wherein the substrate is made of polyethylene resin. 3 The substrate was selected from the group of polyethylene resin, polyolefin resin other than polyethylene resin, and synthetic rubber 1
The insulating cover according to claim 1, wherein the insulating cover is formed from a mixture of at least one species. 4 The substrate was selected from the group of polyethylene resin, polyolefin resin other than polyethylene resin, and synthetic rubber 1
The insulating cover according to claim 1, which is formed from a laminate of a mixture layer consisting of a mixture of at least one species and a polyethylene resin layer. 5. The insulating cover according to claim 1, wherein the viscoelastic sealing layer is formed to become gradually thinner toward one end. 6 Elastic body with adhesive function is rubber or synthetic resin 1
2. The insulating cover according to claim 1, wherein a pressure-sensitive adhesive substance is attached to a foam material which is formed by foaming a material selected from among the above types and has a high recovery property against compression.