JPH0155751B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the connection between electric wires that are introduced or led out from an insulating cover that is applied to the connection parts of straight lines, drop-in wires, branch wires, etc. of installed electric wires, and the cover. The present invention relates to an airtight sealing method for sealing.

[Conventional technology and its problems] Conventionally, insulating covers such as various connector covers and sleeve covers have had the disadvantage that rainwater can enter and corrode the wire connections, and especially near the coast, salt damage accelerates corrosion. This caused a power failure.

In order to solve this problem, for example, the inner diameter of the holding cylinder for inserting the electric wire connected to the side end of the connector of the insulating cover or the housing part of the sleeve is gradually tapered outward to create a small diameter. By forming a tapered hole like this, and cutting off the tip of the holding tube at a point where the diameter of the tapered hole matches the wire diameter, airtightness can be maintained according to the wire diameter. It is well known that it is difficult to perform such adjustment work at high places, and it is also difficult to make sure that the diameter of the wire and the diameter of the taper hole match closely to improve airtightness. is extremely difficult.

Therefore, by filling the holding cylinder of the insulating cover with a butyl rubber compound,
Some devices use this compound to seal the space between the wire and the holding tube. However, in such a device, when the electric wire and the holding tube are in close contact with each other and there is no gap, the compound is unnecessary and is wasted, resulting in an inconvenience of increased costs.

Furthermore, in ``Insulating cover for electric wire connection section'' of JP-A No. 52-109187, symmetrical wing pieces are formed to form a hollow part with a bulge that accommodates the electric wire connection section through the folded wire. Disclosed is a device in which a pressure-deformable viscoelastic sealing layer for sealing an electric wire is formed in both end regions located at the folding tip. However, since a predetermined amount of the viscoelastic sealing layer is provided in advance at fixed positions at both ends of a standard wing piece, it is regulated by the size of the insulating cover, and once it is set at the fixed position, the position and sealing amount cannot be changed. Can not. Therefore, when changing the size of the wire connection part or changing the diameter of the wire at a work site, etc.
There will be a pause. In this case, by replacing the insulation cover with an insulation cover of a different size, the position or thickness of the sealing layer can be changed on the wire to create insulation of just the right size even when it is desired to seal the gap between the wire and the cover. The disadvantage is that it is difficult when there is no cover.

Also, ``Insulators for electrical conductors'' in Utility Model Application No. 51-21869
Then, a splittable box made of an insulating molded product is used to enclose the required insulating parts of the conductor, and the split boxes are joined together, with openings formed at each end of the box to allow the conductor to pass through. Projections are provided at two locations, one at the end and the inner part, and an insulating filler is injected between the projections and hardened. Thereby, by sealing and adhering the conductor and the insulation, the conductor is insulated and the insulation treatment work is facilitated, the time required for the insulation treatment is shortened, and variations in performance are reduced.

However, the sealing adhesive layer formed at the opening of the box is made by sandwiching the insulating sealant between two opposing protrusions and by injecting an insulating filler between the two protrusions. It is very time-consuming and has the disadvantage that it cannot be used for simple and quick work that is required especially at high places.

[Purpose and structure of the present invention] The present invention solves all of the above-mentioned drawbacks and seals the inside of the insulating cover very easily and reliably to maintain airtightness by using a sealing material formed into a long and thin string-like material. The purpose of this method is to provide a method for attaching an insulating cover to the wire connection portion, using a thin string-like material made of a sticky compound such as butyl rubber. An object is attached on a narrow tape-shaped release paper in a substantially straight line and wound, and the string-like object is attached to the surface of the electric wire at a corresponding position of a holding cylinder provided for introducing and leading out the electric wire to the end of the insulating cover. Either remove the release paper and attach it in a circular pattern, or attach the string-like material in a circular pattern to the tube opening of the holding cylinder of the insulating cover while also peeling off the release paper, and then attach the string-like material in a circular pattern to the wire connection part. By applying the cover, a string-like object made of a compound attached to the electric wire is brought into sliding contact with the inner wall surface of the holding tube, and the string-like object is spread to seal the gap between the electric wire and the holding tube. It was designed so that

[Function] The string-like material serving as the sealing material can be attached to the surface of the electric wire in a circular manner while peeling off the release paper at the corresponding position of the holding tube, or it can be simply attached in a circular manner to the tube opening of the holding tube. Since it is easy to install, it is easy to work even at high places.

The position and amount of the string-like material to be attached in a circular pattern will vary depending on the diameter of the wire used because the tip of the holding cylinder is cut off, but in this case, the string-like material can also be peeled off at the work site and placed at any position. The required quantity can be installed quickly.

The sealing material attached to the surface of the electric wire is brought into sliding contact with the inner wall surface of the holding cylinder and spreads, so that the gap between the two can be sealed without any delay.

[Examples] Examples of the present invention will be described below with reference to the drawings.
In the figure, reference numeral 1 shows a cylindrical insulating cover called a sleeve cover as an example, and in this example, it is composed of a main body 1a and a cap body 1b fitted into one end of the main body 1a. Inside the main body 1a and the cap 1b, there is provided a accommodating part 2 for accommodating the connecting part E where the insulation coating B of the electric wires A and A' is peeled off to expose the conductor C and covered with a compression sleeve D. At the tip of the body 1b, holding tubes 4, 4 are provided in series through which the electric wires A, A' are inserted through tapered portions 3, 3'.

On the other hand, numeral 5 is a string-like object made of a sticky material made of a compound such as butyl rubber. It is attached on the release paper 6 in a substantially straight line. The string-like material 5 is always managed in a spirally wound state as shown in FIG.

Then, as shown in Fig. 4, the wires A and A' are inserted through the main body 1a and the cap body 1b, and the insulation coating B is peeled off by a certain length from the ends of the wires A and A' to expose the conductor C. With the compression sleeve D attached and connected in a straight line, release paper 6 is placed on the surface of the wires A and A' at positions corresponding to the holding cylinders 4 and 4'.
The string-like material 5 is attached in a circular manner while being peeled off.
After that, the main body 1a and the cap body 1b are slid together in the direction shown by the arrow in the same figure, and the main body 1a and the cap body 1b are
and the cap body 1b. At this time, main body 1
A protrusion provided on the outer periphery of the cap body 1b is fitted into an annular groove provided on the inner peripheral surface of the accommodating portion 2 formed at a and tightly engaged. In this process, the sticky string-like material 5 is spread out on the inner wall surface of the holding tubes 4, 4' which are in contact with the circumferential surfaces of the electric wires A, A', forming a film-like structure, and connecting the electric wires A, A' and the holding tube. The gap between 4 and 4' can be filled to maintain a sealed state. Also, electric wire A,
Corrosion can be prevented by applying a compound not only to the surface of A' but also to the exposed conductor C or wire connection E.

In addition, the string-like material 5 is not limited to being attached to the electric wires A and A', but is also used from the tapered portions 3 and 3' inside the main body 1a and the cap body 1b to the holding cylinder 4,
Even if it is attached in a circular manner near the entrance of 4', the main body 1
When combining the wires A and the cap body 1b, the string-like material is stretched between the electric wires A and A' and the holding tubes 4 and 4' so that the sliding contact between the holding tubes 4 and 4' is tightened. Can be filled and sealed.

In the above embodiment, the electric wires A and A' were connected in a straight line through a compression sleeve. Next, another embodiment for an insulating cover of a branch line will be described. In FIG. 6, the insulating cover 1' is formed by dividing the lower side of a cylindrical body linearly in the longitudinal direction, and engaging pieces 7a and 7b are removably arranged opposite each other on the outside of the divided parts. A holding cylinder 4 for the electric wire A is connected to the left side of the housing part 2 through the tapered part 3 at the connecting part E where the electric wires A, A' and the branch line A'' are connected through the compression sleeve D. On the right side of the part 2, holding cylinders 4', 4'' for the electric wire A' and the branch line A'' are arranged vertically and in series.

Then, while peeling off the release paper 6 in the same manner as in the previous embodiment, on the surface where the holding tubes 4, 4', 4'' of the electric wires A, A', A'' connected via the compression sleeve D are located. The string-like material 5 is attached in a circular manner. After that, with the engaging pieces 7a and 7b spread apart, the insulating cover 1' is inserted into the accommodating part 2 at the connecting part E.
are positioned and attached so that the engaging pieces 7a,
If 7b is engaged, the string-like objects 5 will connect to the electric wires A and 7b, respectively.
The electric wires A,
It is possible to seal the gap between A', A'' and the holding cylinders 4, 4', 4''.

[Effects of the Invention] As described above, the method for hermetically sealing an insulating cover for an electric wire connection portion of the present invention prevents the contact between the electric wire introduced/lead out at the end of the insulating cover and the inner wall surface of the holding cylinder of the insulating cover. In between, a long and thin string-like object made of adhesive compound is peeled off from a narrow tape-like release paper and circulated, and the insulating cover is slid into contact with the string-like compound to form a film. Since it spreads over the space to seal the gap, it is extremely easy to work with and can be easily constructed even in narrow spaces. In addition, it is economical because you only need to use the appropriate amount of compound at the desired location, so there is no waste, and even if you cut off the tip of the holding cylinder to match the diameter of the wire used at the site, the location and amount of string-like material can be attached at any time. This has the advantage that the airtightness can be determined appropriately and a reliable hermetic seal can be achieved efficiently.

[Brief explanation of drawings]

The figures relate to an embodiment of the present invention, and Figure 1 is an exploded sectional view of an insulating cover used for straight connections;
Figure 2 is a perspective view showing a part of the string-like body, Figure 3 is a side view of the same as above, Figure 4 is a perspective view of the construction state using the insulating cover shown in Figure 1, and Figure 5 is the completed construction. FIG. 6 is a cross-sectional view showing the completed state of construction using an insulating cover used to connect branch lines. 1, 1'... Insulating cover, 4, 4', 4''... Holding tube, 5... String-like object, A, A'... Electric wire, A''...
Branch line, E...Connection part.

Claims (1)

[Claims] 1. When attaching an insulating cover to the wire connection portion, a long and thin string-like material made of a sticky compound such as butyl rubber is placed approximately in a straight line on a narrow tape-like release paper. The string-like material is attached to the surface of the electric wire in a circular manner while peeling off the release paper at the corresponding position of a holding cylinder provided to introduce and lead out the electric wire to the end of the insulating cover. , or by attaching the insulating cover to the cylindrical mouth part of the holding cylinder in a circular manner while peeling off the release paper, and then applying the insulating cover to the wire connection part, the compound adheres to the electric wire on the inner wall surface of the holding cylinder. 1. A method for airtightly sealing an insulating cover for an electric wire connection part, characterized in that the space between an electric wire and a holding cylinder is sealed by spreading a string-like object by slidingly contacting the string-like object.