Large-current-carrying-capacity high-water-temperature-resistant waterproof cable with self-repairing function

Abstract

A high-current-carrying-capacity high-water-temperature-resistant waterproof cable with a self-repairing function relates to the field of high-temperature-resistant waterproof cables and comprises a high-temperature-resistant silicone rubber cable, a silicone rubber self-repairing sheath layer, a waterproof lead sheath layer, a nylon sheath layer and a composite high-strength fiber coating layer which are sequentially arranged from inside to outside. The high-temperature-resistant silicone rubber cable comprises a cable core and a silicone rubber insulating layer. The silicone rubber self-repairing sheath layer is made of a silicone rubber material with the hardness of 30-50 Shore A, and the gap between the silicone rubber self-repairing sheath layer and the waterproof lead sheath layer is-0.5 mm to-1.0 mm. The invention has the advantages of large current-carrying capacity, high-temperature water resistance, no need of replacement when being accidentally damaged locally, cost reduction, labor hour saving, long service life and the like.

Description

Technical field: The invention relates to a high temperature resistant and waterproof cable, in particular to a large current carrying and high water temperature resistant and waterproof cable with a self-repairing function. Background technology: In recent years, with the improvement of consumption level, hot springs have become a way of recuperation for people's leisure and health care. However, the water temperature of hot springs can not be directly used. Most of them are used by heating the water of low-temperature hot springs or mixing the water of high-temperature hot springs with low-temperature water. For high-temperature hot springs or underground high-temperature hot springs, a submersible pump is needed to extract the high-temperature spring water and mix it with low-temperature water. The existing high-temperature resistant and waterproof cable includes a cable core, an insulating layer, a filling layer, a water-blocking sheath, an inner sheath, a braided layer and an outer sheath; this high-temperature waterproof cable is laid in high-temperature water. If it is damaged locally by accident (such as cracking or hooking holes during laying or use), the water-blocking sheath can only absorb a limited amount of water for a short time to block water, and needs to be replaced in time, which is costly and wastes labor; the outer protective layer (inner sheath layer and outer sheath layer) cannot be used when local cracks appear, and the service life is short. Summary of the invention: The purpose of the present invention is to provide a high-current-carrying, high-temperature-resistant and waterproof cable with a self-repairing function, which has a large current-carrying capacity, is resistant to high-temperature water, does not need to be replaced when locally damaged by accident, reduces costs, saves work hours, has a long service life, and has a high current-carrying capacity and high-water-temperature resistance.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A high-current-carrying, high-water-temperature-resistant and waterproof cable with a self-repairing function, characterized in that it comprises a high-temperature-resistant silicone rubber cable, a silicone rubber self-repairing sheath layer, a waterproof lead sheath layer, a nylon sheath layer and a composite high-strength fiber outer layer arranged in sequence from the inside to the outside; the high-temperature-resistant silicone rubber cable comprises a cable core and a silicone rubber insulation layer; the silicone rubber self-repairing sheath layer is made of a silicone rubber material with a hardness of 30 to 50 Shore A, and the gap between the silicone rubber self-repairing sheath layer and the waterproof lead sheath layer is -0.5 mm to -1.0 mm.

[0005] Furthermore, the cable core of the high temperature resistant silicone rubber cable is formed by co-twisting five types of tinned soft copper wires, and the silicone rubber insulation layer is formed by extruding silicone rubber on the outside of the cable core and vulcanizing it. The high temperature resistant silicone rubber cable core uses fine tinned oxygen-free annealed copper wires, which are first bundled into strands in regular layers and then co-twisted into a core. The insulation uses silicone rubber material with a conductor working temperature of up to 180°C, which is formed by extrusion equipment.

[0006] The silicone rubber self-repairing sheath layer is made of silicone rubber material with a hardness of 35 to 40 Shore A, which is directly squeezed into the gap for filling. By setting the gap between the silicone rubber self-repairing sheath layer and the waterproof lead sheath layer to a negative gap of -0.5 to -1.0 mm, the silicone rubber sheath is subjected to a certain extrusion force. Once the cable is damaged by external force, the silicone rubber self-repairing sheath layer can be squeezed and filled into the damaged part under the action of the extrusion force, so that the cable can be used normally, and the self-repairing function is realized.

[0007] The nylon sheath layer described in the present invention is formed by extruding non-toxic and corrosion-resistant nylon material. As a protective layer for the waterproof lead sheath layer, the nylon sheath layer can prevent the toxins of lead from diffusing into the water, and also prevent the lead and other metals in the water from forming a primary battery to form corrosion.

[0008] The composite high-strength fiber outer sheath described in the present invention is formed by wrapping the submarine cable PP rope and high-strength aramid fiber.

[0009] The high temperature resistant silicone rubber cable of the present invention adopts silicone rubber as the insulating material, and the current carrying capacity of the conventional waterproof cable using cross-linked polyethylene insulation is at least increased by 30%. The waterproof lead sheath made of metal lead is used for radial waterproofing of the cable. The lead sheath is a relatively soft metal material used in the cable industry. The lead sheath can not only meet the radial waterproofing requirements, but also is basically not affected by the water depth, and does not affect the overall current carrying capacity of the cable. Non-toxic nylon with excellent corrosion resistance is used as the protection of the metal lead sheath. The nylon sheath only needs a very thin layer of about 0.2mm thickness. The nylon thermal resistance coefficient is small, and the impact on the current carrying capacity can be ignored. The outer sheath adopts the submarine cable PP rope and the high-strength aramid material. When it is laid in the water, the water can directly contact the nylon sheath. The layer has no effect on the current carrying capacity. At the same time, the proportion of aramid in the outer sheath can be increased according to the laying length and vertical drop of the cable, so that the cable laying is not affected by the vertical drop. The present invention has the advantages of large current carrying capacity, high temperature water resistance, self-repair when locally accidentally damaged, no need to replace, cost reduction, labor saving, long service life, etc. Description of the drawings:

[0010] Figure 1 It is a schematic diagram of the structure of the cable of the present invention. Specific implementation method: The present invention is further illustrated below in conjunction with the accompanying drawings and specific embodiments, but is not intended to be a limitation of the present invention.

[0012] like Figure 1The high-current-carrying, high-water-temperature-resistant and waterproof cable with a self-repairing function shown in the figure comprises a high-temperature-resistant silicone rubber cable, a silicone rubber self-repairing sheath layer 3, a waterproof lead sheath layer 4, a nylon sheath layer 5 and a composite high-strength fiber outer layer 6 arranged in sequence from the inside to the outside; the high-temperature-resistant silicone rubber cable comprises a cable core 1 and a silicone rubber insulation layer 2, the cable core is the conductor of the cable, the cable core adopts fine tinned oxygen-free annealed copper wire, firstly bundled into strands in regular layers, and then twisted into a core in the same direction; the silicone rubber insulation layer 2 is formed by extruding silicone rubber on the outside of the cable core 1 and vulcanizing it. The silicone rubber self-repairing sheath layer is made of silicone rubber material with a hardness of 35 to 40 Shore A. Under high-temperature water, the silicone rubber self-repairing sheath layer maintains a relatively soft state. The gap between the silicone rubber self-repairing sheath layer and the waterproof lead sheath layer is a negative gap of -0.5mm to -1.0mm.

[0013] The nylon sheath layer 5 described in the present invention is formed by extruding a non-toxic and corrosion-resistant nylon material. As a protective layer for the waterproof lead sheath layer 4, the nylon sheath layer 5 can prevent the toxins of lead from diffusing into the water, and also prevent lead and other metals in the water from forming a primary battery to form corrosion. The composite high-strength fiber outer layer is formed by a submarine cable PP rope and a high-strength aramid wrapping.

[0014] The waterproof lead sheath in the present invention can prevent water from radially entering the interior of the cable. When the water depth is large and exceeds 50 meters, the rubber-plastic material will penetrate under the action of pressure. The waterproof lead sheath is made of dense metal lead, which can effectively prevent moisture from penetrating the lead sheath into the interior of the cable. Metal lead is acted upon by oxygen, water and carbon dioxide in the air, and its surface will quickly oxidize to form a protective film; it will basically not react with cold acids and cold alkalis, but will react with strong acids and strong alkalis at high temperatures. The maximum temperature of high-temperature water does not exceed 100°C, and the waterproof lead sheath can adapt to deep water and high temperature environments. The present invention utilizes the high temperature resistance of silicone rubber materials and adds a waterproof lead sheath on the basis of temperature resistance, which hardly increases the thermal resistance of the sheath so that it can be used in high-temperature and deep water. The present invention solves the technical problem that high-temperature cables with large current carrying capacity cannot be used in water, and cables used in water are not resistant to high temperatures.

[0015] The high temperature resistant silicone rubber cable of the present invention adopts silicone rubber as the insulating material, and the current carrying capacity is increased by at least 30% compared with the traditional waterproof cable using cross-linked polyethylene insulation. The waterproof lead sheath made of metal lead is used for radial waterproofing of the cable. The lead sheath is a relatively soft metal material used in the cable industry. The use of the lead sheath can not only meet the radial waterproofing requirements, but also is basically not affected by the water depth, and does not affect the overall current carrying capacity of the cable. Non-toxic nylon with excellent corrosion resistance is used as the protection of the metal lead sheath. The nylon sheath only needs a very thin layer of about 0.2mm thickness. The thermal resistance coefficient of nylon is small, and the effect on the current carrying capacity can be ignored. The outer sheath adopts submarine cable PP rope and high-strength aramid material. When laid in water, water can directly contact the nylon sheath. This layer has no effect on the current carrying capacity. At the same time, the proportion of aramid in the outer sheath can be increased according to the laying length and vertical drop of the cable, so that the cable laying is not affected by the vertical drop. The silicone rubber self-repairing sheath layer adopts silicone rubber material with a hardness of 35 to 40 Shore A, which is directly squeezed into the gap for filling. The silicone rubber sheath maintains a certain softness in high-temperature water; by adjusting the lead extrusion mold so that the waterproof lead sheath mold is smaller than the outer diameter of the extruded silicone rubber self-repairing sheath layer, the gap between the silicone rubber self-repairing sheath layer and the waterproof lead sheath layer (metal lead sheath) is a negative gap of -0.5 to -1.0 mm, so that the silicone rubber sheath is subjected to a certain extrusion force. Once the cable is damaged by external force, and gaps or through holes appear, the silicone rubber self-repairing sheath layer can be squeezed and filled into the damaged part under the action of the extrusion force, and the gaps or through holes are sealed, so that the cable can be used normally, and the self-repairing function is realized. The present invention has the advantages of large current carrying capacity, high temperature water resistance, self-repair when locally damaged by accident, no need to replace, reduced cost, saving work time, and long service life.

Claims

1. A high current carrying, high water temperature resistant and waterproof cable with self-repairing function. It is characterized in that It includes a high-temperature resistant silicone rubber cable, a silicone rubber self-repairing sheath layer, a waterproof lead sheath layer, a nylon sheath layer and a composite high-strength fiber outer layer which are arranged in sequence from the inside to the outside; the high-temperature resistant silicone rubber cable includes a cable core and a silicone rubber insulation layer; the silicone rubber self-repairing sheath layer is made of silicone rubber material with a hardness of 30 to 50 Shore A, and the gap between the silicone rubber self-repairing sheath layer and the waterproof lead sheath layer is -0.1mm to -2.0mm.

2. The high current carrying capacity, high water temperature resistant and waterproof cable with self-repairing function according to claim 1, It is characterized in that The cable core of the high temperature resistant silicone rubber cable is formed by co-twisting five types of tinned soft copper wires, and the silicone rubber insulation layer is formed by extruding silicone rubber on the outer side of the cable core and vulcanizing it.

3. The high current carrying capacity, high water temperature resistant and waterproof cable with self-repairing function according to claim 1, It is characterized in that The silicone rubber self-repairing sheath layer is formed by directly squeezing a silicone rubber material with a hardness of 35 to 40 Shore A into the gap for filling.

4. The high current carrying capacity, high water temperature resistant and waterproof cable with self-repairing function according to claim 1, It is characterized in that The gap between the silicone rubber self-repairing sheath layer and the waterproof lead sheath layer is -0.5mm to -1.0mm.

5. The high current carrying capacity, high water temperature resistant and waterproof cable with self-repairing function according to claim 1, It is characterized in that The nylon sheath layer is formed by extruding non-toxic and corrosion-resistant nylon material.

6. The high current carrying capacity, high water temperature resistant and waterproof cable with self-repairing function according to claim 1, It is characterized in that The composite high-strength fiber outer sheath is formed by wrapping the submarine cable PP rope and high-strength aramid fiber.

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