JP2002252918A - Waterproof structure for connection of branched cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof structure for the connection of a branched cable, which is favorable for waterproof structure at a position, where the branch line is branched from the main line of a high-voltage aerial line, and can maintain waterproof property for a long time. SOLUTION: A branched line 20 is branched from main line 10 by crimping and connecting, with a terminal metal fitting 30, at both of the ends of the conductor 22 of the branched line 20 and the conductor 12 of the main line 10, which are insulated cables. A rubbery cut-off block 31 is adherently fitted between the main line 10 and the branched line 20 so as to efficiently prevent the infiltration of moving water especially by rainwater. The whole of the branch portions including the cut-off block 31 and the terminal metal fitting 30 are watertightly sealed with waterproof tape 32. Each opening 33b and 33c, which is at one end and at the other end of an insulated protection cover 33 and is the entrance for the main line 10 and the branch line 20, is sealed watertight by waterproof tapes 34 and 35 so as to seal the whole of the branch portions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure at a portion where a branch line branches from a main line such as a high-voltage overhead distribution line.

[0002]

2. Description of the Related Art When another high-voltage overhead insulated wire or a high-voltage down-load overhead insulated wire is branched from the main line of a high-voltage overhead distribution line,
If rainwater enters these branches, stress corrosion may occur and lead to a disconnection accident. Generally, in order to prevent rainwater from entering the branch, the entire branch is covered with an insulating protective cover, and waterproof tape is wrapped around both ends of the cover where the main line and the branch line enter and exit. are doing.

However, as a measure against waterproofing of rainwater, which is running water that enters through a gap between the main line and the branch line, simply taping the both ends of the cover is not sufficiently effective. In addition, if the wound tape is deteriorated due to use over time, the adhesive strength is reduced, and the required waterproofness cannot be secured.

[0004] In view of such circumstances, Japanese Patent Laid-Open No. 5-47447 (Patent No. 303261) discloses a technique proposed in the background.
No. 7). This is schematically illustrated in FIGS. 3A and 3B. When the branch line 2 branches off from the main line 1, the branch connection portion is connected to the insulating protection cover 3
It is covered with. Both ends of the insulating protective cover 3 through which both the main line 1 and the branch line 2 enter and exit are sealed by forming a waterproof layer 4 made of a waterproof mixture. Further, a waterproof piece 5 made of a waterproof mixture having a different compression deformation amount is interposed in a gap between the main line 1 and the branch line 2 on which the waterproof layer 4 is formed.

In this case, the initial purpose of preventing running water from entering from the gap between the main line 1 and the branch line 2 is to prevent the insulated protective cover 3
Is achieved by closing the both ends with a waterproof layer 4 or a waterproof piece 5 made of a waterproof mixture instead of taping.

[0006]

However, in the conventional structure shown in FIGS. 3A and 3B, the waterproof layer 4 is not provided.
Only the both ends of the insulating protective cover 3 are subjected to the waterproof treatment with the waterproof piece 5. That is, the insulating protective cover 3
There is no such waterproof treatment in the middle part in the middle, and it is extremely hollow. Therefore, if the waterproof layer 4 or the waterproof piece 5 provided at the both ends of the cover has an unexpected situation such as cracks or gaps, and the waterproof property is impaired once, the branch portion inside the insulating protective cover 3 can be immediately replaced. There is no way to ensure waterproofness. Therefore, the waterproof structure which is used for a long time in a severe environment such as a high-voltage overhead power distribution line lacks reliability.

Accordingly, an object of the present invention is to provide a waterproof structure of a wire branch connection portion which is suitable for a waterproof structure of a portion where a branch line branches from a main line such as a high-voltage overhead power distribution line and can maintain waterproofness for a long time. It is in.

[0008]

According to a first aspect of the present invention, there is provided a waterproof structure for a wire branch connection portion, wherein a branch line is branched from a main line which is an insulated wire. And at the branch, the branch line 20
The terminal metal 3 is connected to the conductor 22 of the
In the wire branch connection portion which is crimped and connected at 0,
A rubbery water blocking block 31 provided in a gap between the main line 10 and the branch line 20 in close contact with both lines, and a second watertight block covering the entire branch portion including the water blocking block 31 in a watertight manner. A first waterproofing means, an insulating protective cover 33 covering the branch covered by the first waterproofing means, and both end openings 33b through which the main line 10 and the branch line 20 enter and exit from the insulating protective cover 33. , 33c in a watertight manner.

With the above configuration, before the insulating protective cover 33 is put on, the conductors 12 and
The entirety including the branch portion where the base wire 22 is press-bonded and the water blocking block 31 closely attached to the gap between the main line 10 and the branch line 20 is covered with the first waterproofing means. Therefore, as in the conventional case, not only the both ends of the cover but also the inner corners of the insulating protective cover 33 are waterproofed, so that the waterproofness to the branch portion is further increased. In addition, since the second waterproofing means is further provided on the opening portions at both ends of the insulating protective cover 33, it is possible to ensure the waterproofness. Further, in this case, since the rubber-made water blocking block 31 is in close contact with both the main line 10 and the branch line 20 to close the gap between the two lines, running water due to rainwater particularly enters through the gap between the two lines. Can be effectively prevented.

Further, in the waterproof structure for an electric wire branch connection part according to the present invention, the first and second waterproofing means may be formed by wrapping waterproof tapes 32, 34, 35 or silicon RT.
It is a waterproof coating coated with V.

With the above construction, as the first and second waterproofing means, the waterproofing film can be easily formed by wrapping a waterproofing tape or applying silicon RTV which is a room temperature vulcanizable silicone rubber. , And reliable waterproofness can be obtained.

According to a third aspect of the present invention, in the waterproof structure of the electric wire branch connection portion, a foamable urethane foam is provided inside the insulating protection cover 33 in a state of being covered from above the first waterproofing means. It is characterized by being filled.

With the above-described structure, the filled foamable urethane foam 36 can be spread all over the inside of the insulating protective cover 33, so that the foamable urethane foam 36 can cooperate with the first waterproofing processing means that has been treated in the previous stage to ensure thoroughness. Waterproofness is obtained.

The waterproof structure of the electric wire branch connection part according to the fourth aspect is a suitable means including a two-color molding means on a surface layer of the water blocking block 31 at a portion in close contact with the main line 10 and the branch line 20. In this case, the adhesive layers 31a and 31b are provided.

With the above configuration, the adhesive layers 31a and 31b provided on the surface of the water blocking block 31 are divided into the main line 10 and the branch line 2.
By firmly adhering to the outer periphery of both lines of 0, the degree of adhesion to both lines is increased, and it is particularly effective in preventing running water from entering by rainwater.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a waterproof structure of an electric wire branch connection portion according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view showing the essential parts of the waterproof structure of the present embodiment in a see-through manner. In the case of the main line 10 of an insulated electric wire, for example, a high-voltage overhead distribution line, an insulator 11 at a place where a branch line 20 made of an insulated electric wire such as a high-voltage overhead or a high-voltage dropping overhead is branched and connected is peeled off, and Cu (copper) is applied. The conductors 12 such as wires are exposed. The branch line 20 is also prepared for connection with the main line 10, and the insulator 21 at the end portion thereof is peeled off to form a conductor 2.
2 are exposed. Exposed conductors 12 and 22 of both lines
These are connected by crimping each other with, for example, a type of terminal fitting 30 called a C-shaped branch sleeve.

As a measure against rainwater running water, a branch line 2
A rubber water blocking block 31 is interposed in a gap between the main line 10 at a location where the zero is divided and closely contacted. The water blocking block 31 is formed in a saddle shape as shown in the drawing, and can be brought into close contact with the lower outer periphery of the main line 10 and the upper outer periphery of the branch line 20 by using elastic deformation when viewed from the top and bottom. . One of the reasons why the water stop block 31 is formed in such a saddle-shaped shape is that rainwater running along the main line 10 may flow to the lower part of the outer periphery due to gravity and drip, so the lower part of the outer periphery is sealed and branched. In some cases, it is impossible to go around the gap between the wire 20.

On the other hand, the branch portion where the conductors 12 and 22 are crimped together by the terminal fitting 30 is exposed and not protected against waterproofing. Therefore, the first waterproofing means is applied to the entire branch including the water blocking block 31. In this example, the first waterproofing means is a waterproof tape 32 (for example, waterproof mastic manufactured by Tyco Electronics Raychem Co., Ltd.). Tape S1061 etc.) is wound around the entire branch to cover it.

Next, the branch portion around which the waterproof tape 32 is wound is covered with an insulating protective cover 33 and protected. As illustrated in the enlarged perspective view of FIG. 1, the insulating protective cover 33 is made of resin or the like and is electrically insulated and is folded in the center from the center. It is superimposed and closed, and has a size and shape that can wrap the branch inside the closed interior.

The insulating protective cover 33 is water-tightly sealed by wrapping the openings 33b, 33c at both ends where the main line 10 and the branch line 20 enter and exit with waterproof tapes 34, 35 as second waterproofing means. . That is, the first waterproofing means using the waterproof tape 32 and the waterproof tapes 34 and 35
With the second waterproofing means, a double waterproof coating is applied inside and outside the insulating protective cover 33.

As described above, by ensuring the waterproofing treatment, the branch portion where the conductors 12 and 22 are crimped together is sealed in a water-tight manner, so that the infiltration of rainwater can be prevented for a long period of time, so that stress corrosion can be avoided. Also, concerns such as disconnection accidents can be dispelled.

As another embodiment, the waterproof tape 3 as the first waterproof processing means wound around the entire branch portion is described.
2, and both end openings 33b, 3 of the insulating protection cover 33
Instead of the waterproofing tapes 34 and 35, which are the second waterproofing means obtained by taping 3c, a silicone RTV, which is a room-temperature vulcanizable silicone rubber, is applied, or a self-sealing tape is wound around without gaps to form a waterproof coating. Similar waterproofness can be obtained also by forming.

As shown in FIG. 2, which is a cross-sectional view taken along the line AA of FIG. 1, both end openings 33b,
A foamable urethane foam (for example, Hyprene foam fill, manufactured by Mitsui Toatsu Construction Materials Co., Ltd.) 36 is filled from either side of 33c. It can be spread to every corner. If the both ends of the cover are double-wrapped with waterproof tapes 34 and 35 after filling the urethane foam, almost complete waterproofness can be expected.

Further, as shown in FIG. 2, a rubber water-blocking block 31 is in contact with the lower outer periphery of the main line 10 and the upper outer periphery of the branch line 20. The layers can be provided with adhesive layers 31a and 31b of an adhesive rubber by two-color molding or the like. Instead of using two-color molding, an adhesive member may be attached to provide the adhesive layers 31a and 31b. By providing the adhesive layers 31a and 31b on the surface layer of the water blocking block 31, the main line 10 and the branch line 2 are provided.
The degree of adhesion to zero increases, which is effective in preventing running water from entering rainwater.

[0026]

As described above, according to the waterproof structure of the wire branch connection portion according to the first aspect of the present invention, the conductor of the main wire and the conductor of the branch wire are crimped at a stage before being housed in the insulating protective cover. The entirety of the connecting portion and the branch portion including the water-blocking block closely attached to the gap between the main line and the branch line are water-tightly covered with the first waterproofing means. Therefore, as in the conventional case, not only the both ends of the cover, but also the inner corners of the insulating protective cover in this case are waterproofed, so that the waterproofness to the branch portion is further enhanced. In addition, since the second waterproofing means is further provided at both ends of the insulating protective cover, it is possible to ensure the waterproofness. Also, in this case, since the rubber water blocking block is closely attached to both the main line and the branch line to close the gap between the two lines, it is particularly important that running water due to rainwater enters the gap between the two lines. Can be effectively prevented.

Further, in the waterproof structure of the electric wire branch connection portion according to the second aspect, a waterproof tape is wrapped as a first and a second waterproof treatment means, or a silicon RTV which is a room temperature vulcanized silicone rubber is applied. Thus, simple and reliable waterproofness can be obtained.

Further, the waterproof structure of the wire branch connection portion according to the third aspect of the present invention is such that the filled urethane foam is spread all over the inside of the insulating protection cover, so that the first waterproofing process which has been processed in the previous stage is performed. Complete waterproofness can be obtained in cooperation with the processing means.

Further, the waterproof structure of the electric wire branch connection portion according to the present invention is characterized in that the water blocking block has a pressure-sensitive adhesive layer provided on the surface firmly adhered to the outer periphery of both the main line and the branch line, so that both lines can be connected to each other. This increases the degree of adhesion, and is particularly effective in preventing running water from entering by rainwater.

[Brief description of the drawings]

FIG. 1 is a side view showing an essential part of a waterproof structure of an electric wire branch connection part according to the present invention in a see-through manner.

FIG. 2 is a sectional view taken along line AA of FIG.

FIGS. 3 (a) and 3 (b) are a perspective view and a cross-sectional view showing a waterproof structure in a conventional electric wire branch connection portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main line 11 Insulator 12 Conductor 20 Branch line 21 Insulator 22 Conductor 30 Terminal fitting 31 Waterproof block 31a, 31b Adhesive layer 32 Waterproof tape (first waterproofing means) 33 Insulation protection cover 33b, 33c Opening at both ends 34, 35 waterproof tape (second waterproofing means) 36 foamable urethane foam

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 7/02 301 H01R 4/00 A F-term (Reference) 5E085 BB06 CC04 CC05 DD13 EE11 FF01 GG33 HH06 JJ13 5G333 AA09 AA13 AB02 AB23 BA02 CB16 CC05 DA03 DC03 EB08 5G355 AA03 BA01 BA11 CA26 5G367 EF03 EF05 5G375 AA02 BA26 BB45 BB48 BB56 CA02 CA14 CB03 CB04 CB10 DB23 DB42 DB44 EA02 EA17

Claims (4)

[Claims] 1. A wire branch connection part in which a branch wire is branched from a main wire which is a covered wire, and a conductor at a terminal part of the branch wire is crimped to a conductor of the main wire by a terminal fitting at the branch portion. A rubbery water blocking block provided in a gap between the main line and the branch line in close contact with both of the main line and the branch line; and a second watertight block covering the entire branch portion including the water blocking block. A first waterproofing means, an insulating protective cover covering the entirety of the branch portion covered with the first waterproofing means, and a water-tight opening at both ends of the cover through which the main line and the branch line of the insulating protective cover come and go. And a second waterproofing means closed to the electric wire branch connection portion. 2. The electric wire branch connection according to claim 1, wherein the first and second waterproofing means are a waterproof coating formed by wrapping a waterproof tape or applying a silicon RTV. Waterproof structure of the part. 3. The foaming urethane foam is filled in the inside of the insulating protective cover in a state of being covered from above the first waterproofing means. Waterproof structure of electric wire branch connection. 4. An adhesive layer is provided on a surface layer of the water blocking block at a portion in close contact with a main line and a branch line by an appropriate means including a two-color molding means. The waterproof structure of the electric wire branch connection part according to the above.