JPH03847Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a connection part of a POF cable.

[Summary of the invention] The connection part of the POF cable according to the invention is such that the epoxy unit fitted to the outer periphery of the cable conductor connection part is restrained from both sides by a holding insulator and a restraint body arranged in the longitudinal direction of the cable. This makes it possible to restrain the cable conductor connection area while avoiding an increase in the external size of the connection area.

[Prior Art] The phenomenon of movement of underground cables installed in conduits has been confirmed for a long time, and many adverse effects caused by these movements have been experienced. This movement phenomenon varies depending on the installation route and external environment, but is generally thought to be caused by thermal expansion and contraction of the cable or so-called wave riding caused by vehicles running on the ground.

The harmful effects of this cable movement phenomenon occur in POF cables as well. In other words, the inner diameter of the POF cable pipe is thinner than the inner diameter of the connection box that houses the conductor connection, and the length of the connection box is limited to a certain extent because it is installed in a manhole. If the conductor connection section moves beyond the amount of movement allowed by the length of the box body, the reinforcing insulator of the conductor connection section will be mechanically damaged, causing problems such as insulation failure.

For this reason, the conventional POF cable connection
Each cable core 3 led out from the end of the pipe 2 in the POF cable 1 on both sides as shown in the figure.
The cable conductor 4 is compressed and connected to both ends of the connection conductor 5 to form a conductor connection part 6. An epoxy unit 7 is attached to the outer periphery of the connection body 5, and the conductor connection part including both ends of the epoxy unit 7 is attached. The structure was such that a reinforcing insulator 8 was provided around the outer periphery of the insulator 6 by wrapping an insulating tape. Then, the epoxy unit 7 has its outer periphery flange portion 7A clamped by the clamping members 9A and 9B, and the clamping state is maintained with bolts 10, and the clamping member 9A is fixed to the stop member 12 of the connection box body 11 with the bolt 13. As a result, the conductor connecting portion 6 is restrained by the connecting portion box 11 so as not to move in the longitudinal direction.

[Problems to be solved by the invention] However, if the flange portion 7A is provided outside the epoxy unit 7 to restrain the conductor connection portion 6, there is a drawback that the outer diameter of the POF cable connection portion increases. Ta. In particular, when replacing connections on existing lines, there were cases where installation was impossible due to the outside diameter.

An object of the present invention is to provide a POF cable connection part that can restrain the conductor connection part while avoiding an increase in the outer diameter.

[Means for solving the problems] The structure of the present invention to achieve the above purpose is as follows:
To explain with reference to FIG. 1 corresponding to the embodiment,
In the present invention, an epoxy unit 7 is attached to the outer periphery of the conductor connection part 6 of the POF cable 1, and reinforcing insulators 8 are provided on the outer periphery of the conductor connection part 6 including both sides of the epoxy unit 7, and the conductor At the POF cable connection part where the connection part 6 is restrained to the connection part box 11 via the epoxy unit 7 so as not to move in the longitudinal direction, each inner end is attached to the circumferential surface of both sides of the epoxy unit 7 in the longitudinal direction. a presser insulator 14 with which the portion 14A is abutted and whose outer end portions 14B form a part of the stress relief cone shape of the reinforcing insulator 8 and which holds down the epoxy unit 7 from both sides; The present invention is characterized in that it includes a restraining body 15 that locks the outer end portion 14B of each presser insulator 14 to the connection box body 11.

[Function] When the epoxy unit 7 is restrained by the presser insulator 14 and the restraint body 15 in this way, the connection box 1
The conductor connection portion 6 can be restrained by increasing the outer diameter of the conductor connection portion 6.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIG. Note that portions corresponding to those in FIG. 2 described above are designated by the same reference numerals. In this embodiment, each inner end 14A is in contact with the peripheral surface on both sides in the longitudinal direction of the epoxy unit 7, and the outer end 14B is tapered so as to form a part of the stress relief cone shape of the reinforcing insulator 8. A presser insulator 14 is used, which is made of aluminum and presses the epoxy unit 7 from both sides. The inner end 14A of each presser insulator 14 is also tapered to fit the surface of the epoxy unit 7. Outer end 14 of each presser foot insulator 14
Although not shown, a ground electrode is formed on the stress relief cone-shaped portion in B using a conductive paint or the like, and is connected to a ground electrode (not shown) of the stress relief cone-shaped portion of the reinforcing insulator 8. An inner end 15A of a restraint body 15 is engaged with the outer end 14B of each presser insulator 14, and this restraint body 15 is engaged with the reducer 17 of the connection box 11 via the initial setting position adjustment bolt 16. It has been stopped. In addition, 18 is the restraint body 15 and the adjustment bolt 16.
It is a sitting body interposed between. Also, 19,2
Reference numeral 0 denotes a presser insulating layer that holds down the engaging portion between the epoxy unit 7 and the presser insulator 14 and the engaging portion between the presser insulator 14 and the restraining body 15 so that they do not shift.

In the above embodiment, the adjustment bolt 16 is fixed to the seat 18, but the adjustment bolt 16 is separated from the seat 18 and a spring is interposed between the two, so that when a force exceeding the allowable limit is applied, these compression springs are released. It is also possible to compress it so that the conductor connection 6 can move.

[Effects of the invention] As explained above, in the POF cable connection part according to the invention, the movement of the epoxy unit in the longitudinal direction is restrained by the holding insulator and the restraint body arranged along the longitudinal direction, thereby preventing the conductor connection. Since the movement of the connecting part in the longitudinal direction is restrained, restraint can be achieved while avoiding an increase in the outer diameter of the connecting part. Further, since the outer end of the presser insulator forms a part of the stress relief cone shape of the reinforcing insulator, it is possible to avoid the presser insulator from becoming a problem in mitigating the electric field.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of an embodiment of the POF cable connection part according to the present invention, and FIG. 2 is a vertical cross-sectional view of a conventional POF cable connection part. 1...POF cable, 2...pipe, 3...
Cable core, 4...Cable conductor, 5...Connection conductor, 6...Conductor connection part, 7...Epoxy unit, 8...Reinforcement insulator, 11...Connection part box, 1
4... Presser insulator, 14A... Inner end, 14B...
...outer end, 15...restraint body.

Claims (1)

[Scope of utility model registration request] An epoxy unit is attached to the outer periphery of the conductor connection part of the POF cable, and reinforcing insulators are provided on the outer periphery of the conductor connection part, including both sides of the epoxy unit, so that the conductor connection part does not move in its longitudinal direction. In this way, in the POF cable connection part which is restrained to the connection part box via the epoxy unit, each inner end part is in contact with both sides of the epoxy unit in the longitudinal direction, and each outer end part is in contact with the reinforcing part. a presser insulator forming a part of the stress relief cone shape of the insulator and holding down the epoxy unit from both sides, and an outer end side of each presser insulator being locked to the connection box body. A POF cable connection part characterized by comprising a restraint body that is held in place.