JPS60127609A - Rubber plastic insulated power cable with corrugated metal sheath - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an improvement in a rubber/plastic insulated power cable having a corrugated metal sheath.

[Background of the invention]

The lifespan of rubber-plastic insulated power cables is significantly shortened when used in submerged conditions. For this reason, rubber/plastic insulated cables having a corrugated metal sheath (for example, aluminum, stainless steel, etc.) as a water-blocking layer are widely used.

The metal sheath is a complete water-shielding layer, and as long as it is in good condition, there will be no problem. However, if there is a hole in the metal sheath due to external injury, etc. The water that enters this gap also runs along the length of the cable, causing the entire length of the cable to be flooded.
This results in a shortened cable life. In particular, corrugated metal sheaths are corrugated to give flexibility to the cable, and are generally spiral-shaped.
Because there are large voids in the spiral peaks, water can easily run along the length of the cable.

[Disclosure of the invention]

The present invention has been made to solve the above-mentioned problems, and in a rubber/plastic insulated cable having a corrugated metal sheath, the gap between the corrugated metal sheath and the insulator core is 100 cs or less. The present invention provides a rubber/plastic insulated cable having a corrugated metal sheath which is characterized by being filled and solidified with a time-curing solution having a viscosity of .

The present invention will be explained below with reference to embodiments shown in the drawings.

Figure 1 shows a longitudinal sectional view of a conventional rubber-plastic insulated cable with a corrugated metal sheath.
An insulator 2 made of rubber or plastic is applied on the conductor 1 to form an insulator core 6. Furthermore, a corrugated metal sheath 4 is placed on the insulator core 6, and a rubber sheath is placed on top of this.
It is equipped with an anti-corrosion layer made of plastic.

3 is an insulator core 6 and a corrugated metal sheath 4. This shows the gap created between the Corrugated metal sheaths generally have a spiral shape, and a large gap is created at the top of the spiral. If a hole is made in the corrugated metal sheath 4 due to external injury, water that enters the gap 3 can easily run along the length of the cable. become.

Figure 2 shows a rubber band with a corrugated metal sheath according to the present invention.
This is a vertical cross-sectional view of a plastic insulated cable, which differs from conventional cables in that the gap between the insulator core 6 and the corrugated metal sheath 4 is filled with a time-hardening solution 7 and solidified.

Filling with the time-hardening solution can be carried out by applying the corrugated metal sheath 4 on the insulator core 6, and then evacuating one end of the cable while supplying the solution at atmospheric pressure from the other end. It goes without saying that it will be easier to fill if the solution is supplied.If the viscosity of the solution is 100cs (centistokes) or less, practical solution filling becomes possible, and the peroxidant, curing agent, and curing accelerator are mixed. Polyester materials, epoxy materials, and polyurethane materials are suitable, and after curing, they solidify and become non-flowing.Therefore, even if the corrugated metal sheath is punctured due to trauma or the like and the cable is submerged in water, water will not enter due to the aforementioned trauma. It remains only at a point and does not run along the length of the cable.

〔Effect of the invention〕

The effects of the present invention are as follows.

(1) Even if the corrugated metal sheath has a hole due to trauma or the like and the cable is submerged in water, the water will only enter at the trauma point and will not run along the length of the cable, creating a complete water-blocking layer. It functions as a cable, and can reliably prevent shortening of its life due to flooding.

(2) Even if the corrugated metal sheath has a hole due to external injury or the like and the cable is submerged in water, it is only necessary to repair the damaged part, reducing the cost and time required for repair.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a rubber/plastic insulated power cable having a conventional corrugated metal sheath, and FIG. 2 is a longitudinal sectional view of the present invention. DESCRIPTION OF SYMBOLS 1...Conductor, 2...Insulator made of rubber or plastic, 8...Gap, 4...Corrugated metal sheath,
5...Anti-corrosion layer made of rubber/plastic, 6...
Insulator core, 7... time curing solution. Figure 1 Head 2 Figure ＼5

Claims (2)

[Claims] (1) In a corrugated metal sheathed rubber/plastic insulated cable, apply a time-hardening solution with a viscosity of 0Ocs (centistokes) or less to the gap between the corrugated metal sheath and the insulator core. A rubber/plastic insulated cable having a corrugated metal sheath characterized by being filled and solidified. (2) A polyester material, an epoxy material mixed with a peroxidant, a hardening agent, and a hardening digging agent as a time-hardening solution;
A rubber/plastic insulated cable having a corrugated metal sheath as set forth in claim (1) using a polyurethane material.