High-performance high-temperature-resistant oil-stain-resistant anti-interference medium-voltage power cable

Abstract

The utility model discloses a high-performance high-temperature-resistant oil-stain-resistant anti-interference medium-voltage power cable, and the power cable comprises a cable core which is formed by twisting a plurality of insulated shielding wire cores. A gap of the cable core is filled with thermoplastic polyurethane elastomer rubber; the cable core is wrapped by a superconducting silicon carbide fiber tape shielding wrapping layer, and the superconducting silicon carbide fiber tape shielding wrapping layer is wrapped by an LCP high-molecular liquid crystal polymer high-temperature-resistant fireproof layer in an extruded mode. A graphene aerogel layer is extruded outside the LCP macromolecular liquid crystal polymer high-temperature-resistant fireproof layer, a polysulfonamide fiber braid layer is lapped outside the graphene aerogel layer, a polyphenylene sulfide fiber tape is coated outside the polysulfonamide fiber braid layer through a semi-conductive adhesive, an armor layer is arranged outside the polyphenylene sulfide fiber tape, and the armor layer is wrapped outside the LCP macromolecular liquid crystal polymer high-temperature-resistant fireproof layer. And a hydrogenated butadiene-acrylonitrile rubber outer sheath is extruded outside the armor layer. According to the utility model, normal operation of a line can be ensured in a complex and severe environment for a long time, and the service life of the cable is greatly prolonged.

Description

Technical Field

[0001] This utility model relates to the field of power cables, specifically to a high-performance, high-temperature resistant, oil-resistant, and interference-resistant medium-voltage power cable. Background Technology

[0002] With the rapid development of the global economy and the continuous advancement of infrastructure construction, the demand for medium-voltage cables has increased significantly. Especially in industries such as urban rail transit, automobile manufacturing, and shipbuilding, the application of medium-voltage cables is becoming increasingly widespread. The rapid development of these industries has driven the growth of the medium-voltage cable market. Furthermore, the rapid development of emerging fields such as smart grids, new energy vehicles, and renewable energy has further increased the demand for high-end special cables, further promoting the market demand for medium-voltage cables. The laying environment for medium-voltage cables is complex and harsh, requiring cables to have certain high-temperature resistance. At the same time, the cable surface is frequently exposed to oil, moisture contamination, or external pulling forces. Poor oil resistance can easily lead to cable aging, and accidents caused by poor cable oil resistance are on the rise every year. Therefore, the oil resistance of cables needs to be improved. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, this utility model provides a high-performance, high-temperature resistant, oil-resistant, and interference-resistant medium-voltage power cable. It features high mechanical strength, high temperature resistance, good oil resistance, and good corrosion resistance, making it suitable for cable applications in complex environments with high temperature, high humidity, strong chemical corrosion, and mechanical stress. It can ensure the normal operation of the line in complex and harsh environments for a long time, greatly improving the service life of the cable.

[0004] To achieve the above objectives, this utility model provides a high-performance, high-temperature resistant, oil-resistant, and interference-resistant medium-voltage power cable, comprising a cable core, wherein the cable core is formed by stranding multiple insulated shielded cores; thermoplastic polyurethane elastomer rubber is filled in the gaps of the cable core; a superconducting silicon carbide fiber tape shielding wrapping layer is wrapped around the cable core; an LCP high-temperature fire-resistant liquid crystal polymer layer is extruded over the superconducting silicon carbide fiber tape shielding wrapping layer; a graphene aerogel layer is extruded over the LCP high-temperature fire-resistant liquid crystal polymer layer; an aramid fiber braided layer is wrapped around the graphene aerogel layer; a polyphenylene sulfide fiber tape is coated over the aramid fiber braided layer with a semi-conductive adhesive; an armor layer is provided over the polyphenylene sulfide fiber tape; and a hydrogenated nitrile rubber outer sheath is extruded over the armor layer.

[0005] Furthermore, the hydrogenated nitrile rubber outer sheath is provided with an oil-resistant protective layer.

[0006] Furthermore, the oil-resistant protective layer is formed by coating with epoxy phenolic varnish.

[0007] Furthermore, the insulating shielded core includes a conductor, and the conductor is coated with a coating layer. The coating layer is coated with a conductor shielding layer, an insulation layer, and an insulation shielding layer by a three-layer co-extrusion method. The insulation shielding layer is surrounded by a copper tape shielding wrapping layer.

[0008] Furthermore, the conductor has a hollow support tube at its center, and the inner wall of the hollow support tube is coated with thermally conductive silicone; the conductor is a Class 2 stranded copper conductor conforming to the GB / T3956-2008 standard.

[0009] Furthermore, the coating layer is a nano-silver coating layer.

[0010] Furthermore, the conductor shielding layer is formed by extrusion molding of a cross-linked inner shielding material.

[0011] Furthermore, the insulation layer is formed by extrusion molding of cross-linked polyethylene insulation material.

[0012] Furthermore, the insulating shielding layer is formed by extrusion molding of a cross-linked outer shielding material.

[0013] Furthermore, the armor layer is formed by wrapping galvanized steel strips with gaps.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. The gaps in the cable core of this utility model are filled with thermoplastic polyurethane elastomer rubber, which improves the roundness of the cable and gives the cable core high wear resistance, high tension, high tensile strength, toughness and aging resistance. It also features light weight, good oil resistance, good water resistance, chemical resistance and UV resistance.

[0016] 2. In this invention, the copper conductor surface is coated with a nano-silver coating. On the one hand, the conductivity of nano-silver (approximately 6 × 10⁻⁶) is... 6 The nano-silver coating has a resistance (S / m) close to that of pure silver, and the surface resistance of the conductor can be reduced by 30%-50% after coating, thereby improving the conductivity. The nano-silver forms a dense oxide film on the conductor surface, which delays the oxidation of the copper conductor. On the other hand, in harsh environments such as humidity and acid and alkali, the coating can prevent the conductivity of the conductor from decaying due to corrosion. The nano-silver coating has a melting point as high as 1083°C, which can withstand the heat generated by high-frequency switching or high current. At the same time, a hollow support tube is provided in the center of the conductor. The inner wall of the hollow support tube is coated with thermally conductive silicone for rapid heat dissipation and to reduce the operating temperature of the conductor.

[0017] 3. The cable core of this utility model is wrapped with a superconducting silicon carbide fiber tape shielding layer 8, which has outstanding anti-radiation performance against gamma rays and neutron flux. At the same time, its maximum operating temperature reaches 1200℃, and it has excellent heat resistance and oxidation resistance. Its strength is 1960~4410MPa, and its strength retention rate is more than 80% at the maximum operating temperature. Its modulus is 176.4~294GPa, and it has good chemical stability. Combined with the copper tape shielding layer, the double shielding greatly increases the cable's shielding anti-interference performance.

[0018] 4. The extruded LCP high-temperature fireproof layer 9 in this utility model has excellent heat resistance and thermal stability; its heat distortion temperature can reach above 340℃, and its long-term service temperature can reach 250℃. LCP can still maintain excellent mechanical properties and dimensional stability under high temperature environment, and has a low coefficient of thermal expansion. It has excellent electrical insulation properties, its dielectric strength is higher than that of general engineering plastics, and it has good arc resistance. Its electrical properties are not affected at continuous use temperature of 200-300℃; its intermittent use temperature can reach about 316℃, which increases the high temperature resistance and electrical insulation of the cable.

[0019] 5. The extruded hydrogenated nitrile butadiene rubber outer sheath of this utility model has good oil resistance, and due to its highly saturated structure, it also has good heat resistance, excellent chemical corrosion resistance (good resistance to Freon, acids and alkalis), excellent ozone resistance, and high resistance to compression set. At the same time, hydrogenated nitrile butadiene rubber also has high strength, high tear resistance, and excellent abrasion resistance, which greatly increases the oil resistance and strength of the cable and extends the service life of the cable.

[0020] 6. The hydrogenated nitrile rubber outer sheath of this utility model is provided with an oil-resistant protective layer, which is coated with epoxy phenolic varnish. It has good resistance to crude oil, petroleum, aliphatic hydrocarbon solvents and salt water, and also has good resistance to a variety of chemicals. In addition, it has high mechanical strength, wear resistance and excellent impact resistance, making this cable particularly suitable for cable scenarios with high temperature, high humidity, strong chemical corrosion and complex mechanical stress.

[0021] In summary, this utility model possesses high mechanical strength, high temperature resistance, good oil resistance, and good corrosion resistance, making the cable suitable for cable scenarios with complex environments such as high temperature, high humidity, strong chemical corrosion, and mechanical stress. It can ensure the normal operation of the line in complex and harsh environments for a long time, greatly improving the service life of the cable. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an insulated shielded wire core;

[0023] Figure 2This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0024] Figure 3 This is a structural schematic diagram of Embodiment 2 of the present invention. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims. Example

[0026] like Figure 1-2 As shown, this utility model provides a high-performance, high-temperature resistant, oil-resistant, and interference-resistant medium-voltage power cable, including a cable core, which is formed by stranding multiple insulated shielded cores; thermoplastic polyurethane elastomer rubber 7 is filled in the gaps of the cable core, thereby improving the roundness of the cable, giving the cable core high wear resistance, high tension, high tensile strength, toughness and aging resistance, and features such as light weight, good oil resistance, good water resistance, chemical resistance and UV resistance.

[0027] In this embodiment, the insulated shielded core includes a conductor 1, a coating layer 2 on the outside of the conductor, a conductor shielding layer 3, an insulation layer 4, and an insulation shielding layer 5 extruded on the outside of the coating layer using a three-layer common extrusion method, and a copper tape shielding wrapping layer 6 on the outside of the insulation shielding layer.

[0028] In this embodiment, further optimization is achieved by using a Class 2 stranded copper conductor conforming to the GB / T3956-2008 standard. The surface of the copper conductor is coated with a nano-silver coating. This nano-silver has a high conductivity (approximately 6 × 10⁻⁶). 6 The nano-silver coating has a resistance (S / m) close to that of pure silver, and the surface resistance of the conductor can be reduced by 30%-50% after coating, thereby improving the conductivity. The nano-silver forms a dense oxide film on the conductor surface, which delays the oxidation of the copper conductor. On the other hand, in harsh environments such as humidity and acid and alkali, the coating can prevent the conductivity of the conductor from decaying due to corrosion. The nano-silver coating has a melting point as high as 1083°C and can withstand the heat generated by high-frequency switching or high current.

[0029] In this embodiment, further optimization is achieved by providing a hollow support tube 16 at the center of the conductor, with the inner wall of the hollow support tube coated with thermally conductive silicone 17 for rapid heat dissipation and reducing the operating temperature of the conductor.

[0030] In this embodiment, further optimization is achieved by using cross-linked inner shielding material for the conductor shielding layer and cross-linked outer shielding material for the insulation shielding layer, thereby improving the shielding performance of the wire core.

[0031] The cable core is wrapped with a superconducting silicon carbide fiber tape shielding layer 8, which has outstanding anti-radiation performance against gamma rays and neutron flux. At the same time, its maximum operating temperature reaches 1200℃, and it has excellent heat resistance and oxidation resistance. Its strength is 1960~4410MPa, and its strength retention rate is more than 80% at the maximum operating temperature. Its modulus is 176.4~294GPa, and it has good chemical stability. Combined with the copper tape shielding layer, the double shielding greatly increases the cable's shielding anti-interference performance.

[0032] An LCP (Liquid Crystal Polymer) high-temperature fire-resistant layer 9 is extruded over the superconducting silicon carbide fiber tape shielding wrapping layer 8. This layer exhibits excellent heat resistance and thermal stability; its heat distortion temperature can reach over 340℃, and its long-term service temperature can reach 250℃. LCP maintains excellent mechanical properties and dimensional stability under high-temperature environments, and has a low coefficient of thermal expansion. It also possesses excellent electrical insulation properties, with a dielectric strength higher than that of general engineering plastics and good arc resistance. Its electrical properties remain unaffected at continuous operating temperatures of 200-300℃, and its intermittent operating temperature can reach approximately 316℃, increasing the cable's high-temperature resistance and electrical insulation. A graphene aerogel layer 1 is then extruded over the LCP high-temperature fire-resistant layer. 0. An aramid fiber braided layer 11 is wrapped around the graphene aerogel layer. A polyphenylene sulfide fiber tape 12 is bonded and covered to the aramid fiber braided layer with a semi-conductive adhesive. An armor layer 13 is provided outside the polyphenylene sulfide fiber tape. A hydrogenated nitrile rubber outer sheath 14 is extruded outside the armor layer. It has good oil resistance and, due to its highly saturated structure, good heat resistance, excellent chemical corrosion resistance (good resistance to Freon, acids, and alkalis), excellent ozone resistance, and high resistance to compression set. At the same time, hydrogenated nitrile rubber also has high strength, high tear resistance, and excellent abrasion resistance, which greatly increases the oil resistance and strength of the cable and extends its service life.

[0033] It should be noted here that the graphene aerogel layer 10, the aramid fiber braided layer 11, and the polyphenylene sulfide fiber tape 12 form a composite reinforced oil-resistant structure in the cable. Graphene aerogel possesses extremely high elasticity, returning to its original shape even after being compressed by 80%. It exhibits ultra-fast and ultra-high adsorption capacity for organic solvents, making it the material with the strongest reported oil absorption capacity. Existing oil-absorbing products generally can only absorb about 10 times their own weight in liquid. Each gram of graphene aerogel can absorb and store up to 900 grams of oil at a rate of 68.8 grams per second, significantly improving the cable's oil resistance and protecting the cable's internal structure from oil corrosion. Secondly, the aramid fiber braided reinforcement layer has excellent electrical insulation and heat resistance, enabling it to... It can withstand temperatures exceeding 350℃ without losing strength, has high flame retardancy, a limiting oxygen index exceeding 30%, and good chemical stability. Except for a few highly polar solvents and concentrated sulfuric acid, it exhibits good stability to chemicals at room temperature. Furthermore, polyphenylene sulfide fiber tape has advantages such as high mechanical strength, high temperature resistance, chemical resistance, flame retardancy, good thermal stability, and excellent electrical properties. The combination of these three layers greatly increases the cable's oil resistance, high temperature resistance, and mechanical properties, allowing the cable to operate and be used normally in oily environments and protecting the internal structure of the cable from the influence of the external environment.

[0034] In this embodiment, further optimization is achieved by using galvanized steel strips wrapped with gaps, and the double-layer gap wrapping can improve the bending performance of the cable. Example

[0035] In this embodiment, as Figure 1 , 3 As shown, based on Example 1, the hydrogenated nitrile rubber outer sheath 14 is provided with an oil-resistant protective layer 15, which is coated with epoxy phenolic varnish. It has good resistance to crude oil, petroleum, aliphatic hydrocarbon solvents and salt water, and also has good resistance to a variety of chemicals. In addition, it has high mechanical strength, wear resistance and excellent impact resistance, making this cable particularly suitable for cable scenarios with high temperature, high humidity, strong chemical corrosion and complex mechanical stress.

[0036] In summary, through the above design, this utility model possesses excellent properties such as high mechanical strength, high temperature resistance, good oil resistance, and good corrosion resistance. This makes the cable suitable for cable scenarios with complex environments such as high temperature, high humidity, strong chemical corrosion, and mechanical stress. It can ensure the normal operation of the line in complex and harsh environments for a long time, greatly improving the service life of the cable.

[0037] There are many specific applications of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of this utility model, and these improvements should also be considered within the protection scope of this utility model.

Claims

1. A high performance, high temperature resistant, oil resistant, and anti-interference type medium voltage power cable, characterized in that: The cable core is twisted by a plurality of insulated shielded wire cores, and the space of the cable core is filled with thermoplastic polyurethane elastomer rubber; the cable core is wrapped with a superconducting silicon carbide fiber tape shielding wrapping layer, and the superconducting silicon carbide fiber tape shielding wrapping layer is further wrapped with an LCP high-molecular liquid crystal polymer high-temperature resistant fireproof layer; the LCP high-molecular liquid crystal polymer high-temperature resistant fireproof layer is further wrapped with a graphene aerogel layer, the graphene aerogel layer is further wrapped with a polysulfone fiber braided layer, the polysulfone fiber braided layer is further coated with a polyphenylene sulfide fiber tape through a semi-conductive adhesive, and the polyphenylene sulfide fiber tape is further provided with an armor layer, and the armor layer is further wrapped with a hydrogenated nitrile rubber outer sheath.

2. A high performance, high temperature resistant, oil resistant, and anti-interference type medium voltage power cable according to claim 1, characterized in that: The hydrogenated nitrile rubber outer sheath is provided with an oil-resistant protective layer.

3. A high performance, high temperature resistant, oil resistant, and anti-interference type medium voltage power cable according to claim 2, characterized in that: The oil-resistant protective layer is coated by an epoxy novolac.

4. The high-performance, high-temperature resistant, oil-contamination resistant, anti-interference type medium-voltage power cable according to claim 1 or 3, characterized in that: The insulated shielded wire core comprises a conductor, and the conductor is provided with a coating layer, and the coating layer is provided with a conductor shielding layer, an insulation layer and an insulation shielding layer through a three-layer common extrusion method, and the insulation shielding layer is provided with a copper tape shielding wrapping layer.

5. A high performance, high temperature resistant, oil resistant, and anti-interference type medium voltage power cable according to claim 4, characterized in that: The center of the conductor is provided with a hollow support tube, and the inner wall of the hollow support tube is coated with heat-conducting silica gel; and the conductor meets the GB / T3956-2008 standard type 2 twisted copper conductor.

6. A high performance, high temperature resistant, oil resistant, and anti-interference type medium voltage power cable according to claim 4, characterized in that: The coating layer is a nano-silver coating layer.

7. A high performance, high temperature resistant, oil resistant and anti-interference type medium voltage power cable according to claim 4, characterized in that: The conductor shielding layer is extruded by a cross-linked inner shielding material.

8. A high performance, high temperature resistant, oil resistant and anti-interference type medium voltage power cable according to claim 4, characterized in that: The insulation layer is extruded by a cross-linked polyethylene insulation material.

9. The high performance, high temperature and oil resistant, anti-interference type medium voltage power cable according to claim 4, characterized in that: The insulation shielding layer is extruded by a cross-linked outer shielding material.

10. The high performance, high temperature resistant, oil resistant, and anti-interference medium voltage power cable according to claim 1, characterized in that: The armor layer is formed by gap wrapping of galvanized steel strips.

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