JPS5922730Y2 - Foamed polyethylene electric wire repair department - Google Patents

Description

[Detailed explanation of the invention] Electrical wires connected to marine equipment used in the sea are often floated with the specific gravity of the wires being lower than the specific gravity of seawater, and it is recommended to use foamed polyethylene, which has a low specific gravity, for the covering. It is valid.

An example is shown in FIG.

10 is a cable core.

For example, it consists of seven wire cores 12.

14 is the conductor, and 16 is the insulator, which is made of cross-linked polyethylene.

20 is a covering made of foamed polyethylene.

This wire is easily damaged during handling and often requires repair.

300 in FIG. 1 is a conventional repair department.

This is done by stripping off the damaged part of the polyethylene foam, then wrapping polyethylene tape around the same diameter as possible.
It is heat-fused.

However, since this repair part 300 is made of a solid body of polyethylene, it is very hard and difficult to bend compared to the normal part of the covering 20 made of foamed polyethylene, so bending strains are concentrated near the part A in the figure. , the conductor 14 is likely to break.

The purpose of the present invention is to make the repaired part as bendable as a normal foamed polyethylene covering.

Therefore, in the present invention, the repair portion 30 is formed of two layers as shown in FIG.

Inside is a rubber layer 32 that is more flexible than the foamed polyethylene of the covering 20.

Moreover, the outside is the same polyethylene layer 34 as the conventional one.

Example (FIG. 2) As before, the damaged portion of the foamed polyethylene of the covering 20 is stripped off.

First, a tape of unvulcanized EP rubber is wrapped and vulcanized to form the rubber layer 32.

Its thickness is approximately 2/3 of the thickness of the coating 20.

A polyethylene tape is wound thereon until it has the same diameter as the normal coating 20, and heat fused to form a polyethylene layer 34.

The polyethylene layer 34 is also fused to the rubber layer 32.

In this way, the flexibility of the repair part 30 as a whole becomes comparable to that of foamed polyethylene.

Note that if the repair part 30 is made of only EP rubber, the flexibility will be too good compared to foamed polyethylene.

Furthermore, since the coefficient of friction of EP rubber is different from that of foamed polyethylene, only EP rubber tends to be prone to bending.

Effect of the invention By combining the rubber layer 32, which has better flexibility than foamed polyethylene, and the polyethylene layer 34, which has less flexibility, the overall flexibility of the repair part 30 can be made to be about the same as that of foamed polyethylene. be able to.

Therefore, the bending strain will not be concentrated in one part, and no wire breakage will occur due to it.

[Brief explanation of drawings]

Figure 1 shows a foamed polyethylene electric wire and a conventional repair section 300.
FIG. 2 is an explanatory diagram of an example of the repair section 30 of the present invention. 10... Cable core, 20... Covering,
30... Repair department, 32... Rubber layer, 3
4...Polyethylene layer.

Claims (2)

[Scope of utility model registration request] (1) The repair material to be filled into the hole formed after the covering of the foamed polyethylene is removed is intercepted by a double layer consisting of a rubber layer, which is more flexible than the foamed polyethylene, and a polyethylene layer. Repair department for foamed polyethylene electric wires. (2) The repair part for a foamed polyethylene electric wire according to claim 1, wherein the rubber layer is made of EP rubber.