JPS5847803Y2 - Power cable termination - Google Patents

Description

[Detailed Description of the Invention] The present invention improves the airtight structure and protection structure of the end of the electric cable, specifically, the lower side of the insulator tube at the end of the electric cable.

A conventional cable termination of this type will be described with reference to FIG. 1. Reference numeral 9 is an insulator tube filled with an insulating compound 10, into which the terminated cable is drawn.

Reference numeral 20 indicates an insulator of this cable, and reference numeral 21 indicates a cable conductor.

On the upper side of the insulator tube, the conductor pull-out rod 1 connected to the cable conductor 21 is connected to the upper metal fitting 3, the backing tightening metal fitting 22,
It is tightly packed and pulled out through the backing 23.

Note that 4 is the upper metal fitting of the insulator pipe, and 2 is the upper cover.

On the other hand, the lower part of the insulator tube is tightly connected between the insulator tube 9 and the lower metal fitting 6 via the backing 18, and the lower metal fitting 6 and the cable sheath 24.
In between, a lead pipe 17 is tightly attached to the former by soldering or welding to the latter, and a grounding wire 14 is taken out from a copper tape, soldered to this, and then covered with waterproof tape 25 or the like.

Note that 5 is a lower metal fitting of the insulator pipe, 7 is a clamp, and the same reference numerals as in FIG. 2 described later represent the same parts.

In the above, the airtight and protective structure on the lower side of the insulator tube is achieved using the insulator tube 9, the lower metal fitting 6, the backing 18, the lead pipe 17, etc.

Therefore, there are many parts, the structure is complicated, and the cost is high.

The present invention has been developed to solve the above-mentioned problems, and will be explained below with reference to illustrative drawings.

That is, in the present invention, a rubber or plastic cylindrical body 27 as shown in FIG. It is used.

As will be described later, this cylindrical body 27 has a backing part 28 (see FIG. 3) at the upper end that is tightened between the insulator tube 9 and the lower metal fitting 6 via the insulator tube lower metal fitting 5 and a tightening bolt. The reduced diameter portion 29 is closely fixed to the cable sheath 24, for example, a plastic sheath or a metal sheath, and covers the space between the lower end of the insulator tube and the sheath.

FIG. 3 illustrates an enlarged view of the rubber or plastic cylindrical body 27.

Figure a shows a case where the diameter decreases smoothly on the lower side, and Figure a shows a case where the diameter decreases stepwise on the lower side.

In each case, the upper end portion is thickened to form a backing portion 28 in order to maintain the backing effect.

The cylindrical body may be used by cutting the reduced diameter portion 29 at a portion that matches the diameter of each cable.

The lower part of the rubber cylindrical body is airtightly attached to the cable sheath by wrapping waterproof tape 25 or the like around the sheath from the reduced diameter part.

Note that the other parts are similar to the conventional structure explained in FIG. is a clamp, 8 is a backing, 10 is an insulation mixture, 11 is a reinforcing insulation layer, 13 is a ground bolt, 14 is a ground wire, 15 is a self-fusing tape, 20 is a cable insulator, 21 is a cable conductor, and 26 is a ground It shows the line.

According to the above invention, ■ Costs are lowered because the number of parts can be reduced.

It is also easy to work with.

- The reduced diameter part on the lower side of the rubber or plastic cylindrical body can be cut at any desired location and can be adapted to changes in cable diameter.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional front view of the terminal end of a conventional power cable (Figure a).
) and an enlarged view of the lower side of the insulator tube (Figure b), Figure 2 is a longitudinal sectional front view of the terminal end of the electrical cable of the present invention (Figure a) and an enlarged view of the lower side of the insulator tube (Figure b), and Figure 3 is the enlarged view of the lower side of the insulator tube (Figure b). This is a front view of a rubber or plastic cylindrical body used at the end of an electric cable. Figure a shows one in which the diameter decreases smoothly on the lower side, and Figure a shows one in which the diameter decreases stepwise on the lower side. are doing. 3... Upper metal fitting, 4... Insulator tube upper fitting, 5... Insulator tube lower fitting, 6... Lower fitting, 9... Insulator tube , 10... Insulating mixture, 20... Cable insulator, 21...
Cable conductor, 24... Cable sheath, 27
...Rubber or plastic cylindrical body, 28...
...Backing part, 29...Reduced diameter part.

Claims (1)

[Scope of utility model registration request] An insulator tube 9 filled with an insulating mixture 10, a terminal-treated electrical cable drawn into the insulator tube 9 through a lower metal fitting 6, and a cable conductor 21 exposed from a cable insulator 20.
At the end of the cable, which includes at least a conductor pull-out rod 1 that is connected to the upper metal fitting 3 and pulled out to the outside, a backing part 28 is provided at the upper end and a reduced diameter part 29 is provided at the lower part.
Using a rubber or plastic cylindrical body 27 having An electric cable termination portion that covers between the lower end of the insulator tube 9 and the cable sheath 24.