JPS5943786Y2 - Clasp fitting for overhead insulated wires - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a tie-down section for overhead insulated wires.

Conventionally, the anchoring part of an overhead insulated wire, which has an aluminum stranded wire layer on a steel core and an insulating layer on top of it, has been made by stripping the end of the wire and protruding from the end of the aluminum stranded wire layer. It is held in place by a retaining clamp consisting of a steel sleeve that compressively connects the core, and an aluminum sleeve that is covered over the steel sleeve and on the aluminum stranded wire layer protruding from the end of the insulating layer, and that compresses and connects the aluminum stranded wire layer. has been done.

However, if you use the above-mentioned restraint fittings to secure the insulated wire,
There was a problem in that when the aluminum sleeve was compressed, the aluminum sleeve was stretched, causing so-called "litter" in the aluminum stranded wire layer.

This laughter disturbs the external electric field, so it must be suppressed as much as possible.

The present invention provides an insulated wire tie-down part that prevents the external electric field from being disturbed by the above-mentioned laughter.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the retaining part according to the present invention.
Reference numeral 1 denotes an insulated wire, which is composed of an insulating layer 1a, an aluminum stranded wire layer 1b, and a steel core 1c, and the insulating layer 1a and the aluminum stranded wire layer 1b are successively stripped in stages.

2 is a retaining fitting, and this retaining fitting 2 has a steel sleeve 3,
It is composed of an aluminum sleeve 4 and a laughter restriction fitting 5.

The steel sleeve 3 has a retaining part 3a on one end side, and a sleeve part 3b on the other end side to compress and connect the steel core 1c. and covers the protruding aluminum stranded wire layer 1b.

These structures are the same as those of the conventional ones, but in the present invention, a sleeve-shaped laughter-limiting metal fitting 5 is provided between the tip of the aluminum sleeve 4 and the insulating layer 1 at a position along the axis.
is provided.

The laughter limiting fitting 5 is made of aluminum, for example, and its inner diameter is slightly larger than the outer diameter of the insulating layer 1a.

An insulated wire is held in place using the holding fitting having the above structure as follows.

Without the housing, the insulating layer 1a and the aluminum stranded wire layer 1b are stripped in stages to make the steel core 1c and the aluminum stranded wire layer 1b protrude by a predetermined length.

Next, the aluminum sleeve 4 is inserted onto the aluminum stranded wire layer 1b, and the laughter limiting fitting 5 is inserted onto the thin coating layer 1a.

Next, the steel core 1c is compressed by the sleeve portion 3b of the steel sleeve 3.

Next, pull out the aluminum sleeve 4 and the laughter restriction fitting 5,
The aluminum sleeve 4 is compressed along the longitudinal direction.

At this time, laughter occurs in the aluminum stranded wire layer 1b, but since the laughter limiting fitting 5 is inserted into the outer periphery of the aluminum stranding wire layer 1b, the laughter is restricted within the limiting fitting 5.

That is, since the laughter restriction fitting 5 is sleeve-shaped and has an inner diameter □ larger than the outer diameter of the insulating layer 1a, a predetermined gap is created between the inner surface of the laughter restriction fitting 5 and the aluminum stranded wire layer 1b. In other words, since a gap of a predetermined volume is formed between the tip of the aluminum sleeve 4 and the insulating layer 1a at a position along the axis of the retaining part, the twisted aluminum wire layer 1b is removed from above the aluminum sleeve 4 in this gap. The aluminum stranded wire layer 1b can be stored while limiting the increase in diameter caused by the stress caused when the aluminum stranded wire layer 1b is compressed.

Finally, if necessary, □ both ends 19 of the laughter restricting fitting 5 and the joint part C between the steel sleeve 3 and the aluminum sleeve 4 are waterproofed to complete the work.

FIG. 2 shows another embodiment of the present invention, which differs from the previous embodiment in that the laughter restriction fitting 5' is replaced by an aluminum sleeve 4'.
It is a point that is attached to the tip and two parts □.

Since the other parts are the same as those in FIG. 1, they are given the same reference numerals and their explanation will be omitted.

In this way, the aluminum sleeve 4' is integrated with the laughter limiter 5.
Even if ' is provided, it is possible to prevent the aluminum stranded wire layer 1b from being damaged.

As explained above, the anchoring part of the overhead insulated wire according to the present invention includes a steel sleeve that compressively connects the steel core protruding from the end of the stranded aluminum wire layer, and a stranded aluminum wire that protrudes from the top of the steel sleeve and from the end of the insulation layer. An aluminum stranded wire layer is provided on a steel core, and an overhead insulated wire with an insulating layer provided on top of the aluminum stranded wire layer is held down by a detention clamp consisting of an aluminum sleeve that is placed over the wire layer and compressively connects the aluminum stranded wire layer. The retaining portion is characterized in that a sleeve-shaped restraining fitting having an inner diameter larger than an outer diameter of the insulating layer is provided between the tip of the aluminum sleeve and the end of the insulating layer.

Therefore, according to the retention part of the present invention, the laughter of the aluminum stranded wire layer can be suppressed within the laughter restriction fitting, so disturbance of the external electric field can be prevented and an electrically stable retention part can be obtained.

Further, the present invention is extremely easy to implement since it is only necessary to provide a laughter restriction fitting.

Furthermore, since the inner diameter of the laughter limiter is larger than the outer diameter of the insulating layer, it can be installed so as to overhang the end of the insulating layer as shown in the figure, which simplifies the subsequent sealing work and improves the sealing effect. can also be improved.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views showing one embodiment of the anchor portion of an overhead insulated wire according to the present invention, respectively. 1 is an overhead insulated wire, 1a is an insulating layer, 1b is an aluminum stranded wire layer, 1c is a steel core, 2 is a stop fitting, 3 is a steel sleeve, 4, 4
'' is an aluminum sleeve, and 5,5' are laughter restriction fittings.

Claims (1)

[Scope of utility model registration request] An aluminum stranded wire layer is provided on a steel core, and an insulating layer is provided on top of the aluminum stranded wire layer.
The aluminum stranded wire layer was stripped in steps so that the steel cores protruded from the ends of each layer, and the steel core was compressed and connected to a steel sleeve, and the aluminum stranded wire layer was compressed and connected over the steel sleeve and the aluminum stranded wire layer. In the retaining section of an overhead insulated wire held in place by a retaining clamp consisting of an aluminum sleeve, there is a wire with a diameter larger than the outer diameter of the insulating layer between the tip of the aluminum sleeve and the end of the insulating layer at a position along its axis. A sleeve-shaped laughter limiting fitting having an inner diameter is provided, a gap is formed between the inner surface of the laughing limiting fitting and the outer surface of the aluminum stranded wire layer, and the diameter increase due to laughter due to compression of the aluminum stranded wire layer is caused in the gap. A retaining section for an overhead insulated wire, characterized in that it is configured to be housed.