JP2000245049A - Compression apparatus for cable terminal connecting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of an apparatus for miniaturization, by disposing a compression spring between a spring receiving part of a pressing fitting for a stress cone having a spring receiving part at a concentric position and a spring retaining fitting which faces the pressing fitting for positioning and fixing, and applying pressure force against the stress cone to the pressing fitting. SOLUTION: This compression apparatus 20 is provided with a pressing fitting 21 pressing the semi-conductive part of a stress cone 5. The pressing fitting 21 consists of a fitting body 22 having a recessed wall surface and a receiving fitting 23 formed integrally with the fitting body 22. The receiving fitting 23 consists of a central hole 23A through which an electric cable passes and a spring receiving part 23B mounted at a concentric position with the central hole 23A centered, and the spring receiving part 23B is formed out of a cylindrical hole in a lower end opening. A coiled compression spring 26 is disposed between the spring receiving part 23B and a spring retaining fitting 24. It is thus possible to simplify a structure, thereby simplifying shielding processing of a terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression device provided at a cable terminal connection, and more particularly to a compression device for pressing a stress cone.

[0002]

2. Description of the Related Art FIG. 3 is a partial sectional view of a cable aerial terminal connection including a conventional compression device. This aerial terminal connection comprises an insulator tube 2 supported by a lower fitting 1,
In the insulator tube 2, an epoxy insulator 3 as an insulating seat is provided.
Is arranged. The epoxy insulator 3 has an embedding metal fitting 3A which is embedded in the lower part and protrudes in a flange shape, and is fixedly positioned by fixing the washer 3A to the lower metal fitting 1. An insulating tapered surface of the stress cone 5 is pressed against the tapered inner wall surface of the epoxy insulator 3. Note that a terminal portion of the power cable 6 such as a CV cable is inserted through the stress cone.

The conventional compression device 7 has a trumpet-shaped pressing member 8 for pressing the semiconductive portion of the stress cone 5 and a flange-shaped spring receiving portion 9 integrally formed below the pressing member 8. And a plate-shaped washer 10 disposed below the spring receiving portion 9. On the outer peripheral side of the washer 10, lower portions of a plurality of large-diameter shafts 11 whose upper ends are fixed to the embedded metal fitting 3A and extend downward are inserted. The washer 10 is held by nuts 12, 12 screwed to the lower part of each shaft 11. Also,
On the inner peripheral side of the washer 10, lower portions of a plurality of small diameter shafts 13 whose upper ends are fixed to the spring receiving portion 9 and extend downward are inserted. Further, another nut 14 is screwed into a lower portion of each of the shafts 13 positioned every other one. Each of the shafts 13 is provided with a coil-shaped compression spring 16.

In this conventional compression device, each nut 1
By adjusting the amount of screwing of the washer 4 into the shaft 13 against the elastic force of the compression spring 16, the provisional height position of the washer 10 is determined, and the basic pressing force of the device on the stress cone 5 is set. And the shaft 11 of each nut 12
The washer 10 is moved upward by adjusting the screwing amount with respect to, and a desired pressing force is set on the stress cone 5.

[0005]

As described above, the conventional compression apparatus has a plurality of shafts 11, 13 (for example, 16 shafts).
Book) and a plurality of compression springs 1 mounted on each shaft 13.
6 and a plurality of nuts 12 and 14, the number of parts is large, so that the assembling work requires a great deal of labor and time, and there is a drawback that the device configuration becomes large.

[0006]

The present invention has the following arrangement to solve such a problem. The present invention relates to a compression device of a cable terminal connection portion for pressing a stress cone against an insulating seat, wherein a plurality of spring receiving portions are provided concentrically around a cable end portion. A plurality of compression springs are arranged between each of the spring receiving portions and a spring holding member which is positioned and fixed to face the pressing member, and a pressing force is applied to the pressing member to the stress cone. I do.

<Operation> Since a pressing force is applied to the pressing member by the pressing member, the spring holding member, and the plurality of compression springs disposed therebetween, the configuration of the apparatus becomes very simple, and the size of the device is reduced. Is possible. In addition, by selecting a compression spring having a desired elastic force, a predetermined pressing force can be set to the pressing metal only by positioning the spring holding metal.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a partial cross-sectional view of a cable aerial terminal connection including a compression device according to the present invention. The aerial terminal connection includes an insulator tube 2 supported by a lower metal fitting 1, and an epoxy insulator 3 as an insulating seat is arranged in the insulator tube 2. The epoxy insulator 3 has a flange-shaped embedding metal fitting 3A buried in the lower part, and is fixedly positioned by fixing the embedding metal fitting 3A to the lower metal fitting 1. An insulating tapered surface of the stress cone 5 is pressed against the tapered inner wall surface of the epoxy insulator 3. A conductor extraction rod (not shown) is connected to a terminal (upper end) of the power cable 6 inserted into the stress cone 5.

The compression device 20 according to the present invention is provided with a press fitting 21 for pressing the semiconductive portion of the stress cone 5. The press fitting 21 includes a fitting main body 22 having a tapered concave wall surface, and a cylindrical receiving fitting 23 integrally formed with the fitting main body 22. The receiving bracket 23 has a central hole 23A through which the power cable 6 passes, and a plurality of spring receiving portions 23B provided concentrically around the central hole 23A. It is formed from a cylindrical hole with a lower end opening.

A disk-shaped spring holding metal fitting 2 is
4 are facing each other. The spring holding fitting 24 has a through hole for the power cable 6 formed in the center, and a large-thickness flange portion 24A is integrally formed on the periphery. Flange 24
A is provided with a plurality of bolt insertion holes 24B, and the bolt 25 inserted into each bolt insertion hole 24B is
By screwing into A, the flange portion 24A (spring holding bracket 24) is fixedly positioned. A coil-shaped compression spring 26 is arranged between each spring receiving portion 23B and the spring holding bracket 24. Each compression spring 26 is formed of a spring material having a square cross section, thereby preventing deformation in directions other than the expansion and contraction (up and down) directions.

The flange 24A has a ground terminal 24a.
And a ground wire 27 having one end connected to the ground terminal 24 a is connected to a shielding layer of the power cable 6. The bolt insertion hole 24B may be a normal bolt hole into which the head of the bolt 25 does not enter.

In the compression device 20 having the above-described structure, a pressing force is applied to the press fitting 21 by the plurality of compression springs 26, so that the stress cone 5 can be pressed against the epoxy insulator 3 by the press fitting 21. The pressing force can be adjusted by adjusting the screwing amount of the bolt 25 into the embedding fitting 3A.

As described above, since the compression device 20 has a simple structure including the pressing fitting 21, the spring holding fitting 24 and the compression spring 26, the assembling work and the setting work of the pressing force are simplified. . Further, since the configuration is simple, the sheath peeling dimension of the power cable can be reduced, and the terminal shielding process can be simplified.

FIG. 2 is a sectional view of the anticorrosion processing section of the terminal connection section according to the present invention. In FIG. 2, reference numeral 30 denotes a protection fitting of the compression device 20, and the power cable 6 on which the anticorrosion layer 31 is formed is introduced into a cable introduction portion 30 </ b> A of the protection fitting 30. The anticorrosion layer 31 is formed by winding a self-fusing tape. At the lower end of the anticorrosion layer 31, a stopper 32 fixed to the sheath layer of the cable 6 is provided. The stopper 32 is formed by cutting a part of the sheath layer of the cable 6 to a predetermined size when the sheath layer is peeled off.

A self-bonding tape (self-bonding tape) layer 33 is provided on the stopper 32, and glass (FR) is formed thereon.
P) A tape layer 34 is provided. Glass tape layer 3
4, a self-fusing tape layer 35 is further provided, and a water-sealing tape layer 36 is provided thereon. A self-fusing tape layer 37 is further provided on the water sealing tape layer 36, and an adhesive PVC tape layer 38 is provided thereon.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cable aerial terminal connection including a compression device according to the present invention.

FIG. 2 is a cross-sectional view of an anticorrosion processing section of the connection section.

FIG. 3 is a cross-sectional view of a cable aerial terminal connection including a conventional compression device.

[Explanation of symbols]

 Reference Signs List 3 epoxy insulator 5 stress cone 21 press fitting 23B spring receiving part 24 spring holding fitting 26 compression spring

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Hashiguchi 2-1-1, Sakae Oda, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Showa Electric Wire & Cable Co., Ltd. (72) Inventor Kazuhisa Adachi 2 Sakae Oda, Kawasaki-ku, Kawasaki-ku, Kanagawa Prefecture No. 1-1, Showa Electric Wire & Cable Co., Ltd. (72) Inventor Nobuyuki Sema 2-1-1, Sakae Oda, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture F-Term (Showa Electric Wire & Cable Co., Ltd.) F-term (reference) EA17

Claims (1)

[Claims] 1. A compression device for a cable end connection portion for pressing a stress cone inserted through a cable end portion against an insulating seat, wherein a plurality of spring receiving portions are provided at concentric positions around the cable end portion. A press fitting for the stress cone provided, a spring holding fitting that is positioned and fixed to face each of the spring receiving portions of the pushing fitting, and between each of the spring receiving portions and the spring holding fitting. A plurality of compression springs arranged to apply a pressing force to the stress cone to the press fitting, and a compression device for a cable terminal connection portion, wherein