High strength corrosion resistant power cable and method of making same

Abstract

The application relates to the technical field of power cables, and particularly discloses a high-strength corrosion-resistant power cable and a preparation method thereof, which comprises a center tube made of ceramic silicone rubber and a sheath layer. In a normal working state, the conductor is in a dispersed state, the overall temperature of the cable during work is greatly reduced through the dispersed conductor, the working environment of the cable is combined, water flow and the dispersed conductor are mutually cooperative, the working state of the cable is further ensured to be low-temperature, the service life of the cable is greatly improved, the problem that the sheath layer is broken due to uneven expansion caused by cold and heat, and water enters the inside is avoided, when the cable works, the cavity is filled with insulating oil, the flowing cavity in the sheath layer is also filled with insulating oil through the communicating pipe, the insulating oil can fill the gaps in the inside of the cable, a liquid insulation layer is formed, the insulation performance of the cable is improved, and water and corrosive substances are prevented from invading.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power cables, specifically a high-strength corrosion-resistant power cable and its preparation method. BACKGROUND

[0002] In the field of power transmission, high-strength corrosion-resistant power cables are key facilities to ensure stable power supply. Through special structural design and material selection, such cables aim to withstand complex environmental tests and ensure the reliability and safety of power transmission. They are widely used in urban power grids, industrial facilities, marine engineering and other fields, especially in harsh environments such as high humidity, strong corrosion and high mechanical stress. The performance of high-strength corrosion-resistant power cables directly affects the stable operation of the entire power system and plays a crucial role in supporting economic development and social life.

[0003] However, traditional power cables have many problems in actual underwater use. In terms of heat dissipation, the conductor structure of traditional cables is not reasonably designed, making it difficult to effectively disperse the heat generated during work, resulting in high overall cable temperature. Prolonged exposure to high temperatures not only accelerates the aging of internal materials, but also causes the sheath layer to expand and rupture due to uneven heating, which can lead to internal water ingress, causing short circuits and other faults, and significantly reducing the service life of the cable. In terms of insulation performance, traditional cables have many internal voids and lack effective insulation filling measures, making it difficult to resist the intrusion of moisture and corrosive substances, resulting in reduced insulation performance and the risk of electrical leakage. In terms of mechanical strength, the conductor and sheath materials of traditional cables are insufficient in strength and cannot withstand large external forces, making them prone to structural damage when subjected to compression, stretching or bending, affecting power transmission. Moreover, the preparation process of traditional cables is relatively simple, and the adhesion between the layers of materials is poor, making them prone to delamination during long-term use, reducing the overall performance of the cable. In addition, traditional cables usually do not have self-repairing function, and once the surface is damaged, it is difficult to repair itself, requiring frequent replacement, increasing maintenance costs and downtime, and failing to meet the requirements of modern power systems for high reliability and low maintenance costs of cables. SUMMARY

[0004] (I)Technical problems solved

[0005] The present application provides a high-strength corrosion-resistant power cable and its preparation method, which solves the problems mentioned in the background art.

[0006] (II)Technical solutions

[0007] In order to achieve the above object, the present application is implemented by the following technical scheme: a high-strength corrosion-resistant power cable, comprising a center tube made of ceramic silicone rubber, further comprising: a sheath layer, the outer surface of the sheath layer is fixedly connected in mosaic with the outer surface of the center tube, and the sheath layer is fixedly arranged at a fixed interval around the central axis of the center tube; a shielding layer, the shielding layer is arranged inside the sheath layer, and the shielding layer is arranged on the same central axis as the sheath layer; an insulation layer, the outer surface of the insulation layer is fixedly sleeved on the inner surface of the shielding layer; and a conductor, the conductor is fixedly sleeved on the inner surface of the insulation layer.

[0008] According to one embodiment of the present application, a flow cavity is arranged between the sheath layer and the shielding layer, an injection cavity is provided through the inside of the center tube, a communication pipe is fixedly and communicatively arranged through the inner surface of the injection cavity, the outer end of the communication pipe communicates with the flow cavity through the sheath layer, and the injection cavity and the flow cavity are filled with insulating oil.

[0009] According to one embodiment of the present application, the inner end of the communication pipe is fixedly and communicatively arranged with a stabilizing pipe, and the outer surface of the stabilizing pipe is fixedly connected to the inner surface of the injection cavity.

[0010] According to one embodiment of the present application, the inner surface of the sheath layer is fixedly connected with a positioning strip, five positioning strips are fixedly arranged at a fixed interval on the inner surface of the same sheath layer, and a through hole is provided through the side surface of the positioning strip.

[0011] According to one embodiment of the present application, an extrusion cavity is provided through the wall of the center tube, the extrusion cavities are fixedly arranged at a fixed interval around the central axis of the center tube, and support pipes are fixedly connected to the outer surfaces of the two sides of the sheath layer in a symmetrical manner.

[0012] According to one embodiment of the present application, the five support pipes are arranged in a group, the support pipes in the same group are combined into a near-circular ring, the adjacent sheath layers are fixedly connected through the support pipes, an elastic metal mesh is arranged on the inner wall of the support pipe, and the inner cavity of the support pipe communicates with the extrusion cavity.

[0013] The present application provides a preparation method of a high-strength corrosion-resistant power cable, comprising the following steps:

[0014] S1, conductor:

[0015] Material selection: a three-dimensional network carbon phase reinforced copper-based composite material is used as the conductor material;

[0016] Proportioning: short carbon fibers: carbon fibers with lengths of 15 mm, 6.5 mm and 5.5 mm are composed of 0.4 times b, b and 0.6 times b in mass ratio, wherein b is the mass of the intermediate length carbon fiber;

[0017] Carbon nanotubes: 13.5% of the mass of short carbon fibers;

[0018] Copper matrix: mass ratio of copper, nickel, and chromium is 102:2.2:1.2;

[0019] Preparation method: using vacuum infiltration hot pressing forming process, chopped carbon fiber and carbon nanotube preform with copper alloy powder or copper powder in graphite mold sintering, heating to copper alloy or copper melting, and holding for 30 minutes, protection gas, pressure holding infiltration, cooling to get composite material;

[0020] S2, insulation layer

[0021] Material selection: using nano-silicon dioxide modified ethylene-tetrafluoroethylene copolymer as insulation layer material, and adding graphene;

[0022] Proportion: nano-silicon dioxide and ethylene-tetrafluoroethylene copolymer are mixed in a mass ratio of 1:100, and 10% of graphene is added;

[0023] Preparation method: by blending extrusion process, nano-silicon dioxide, graphene and ethylene-tetrafluoroethylene copolymer are uniformly mixed, and a uniform insulation layer is formed on the surface of the conductor by extrusion coating process;

[0024] S3, shielding layer

[0025] Material selection: using multi-layer composite shielding structure, including aluminum foil and carbon fiber, and adding a layer of conductive polymer between aluminum foil and carbon fiber;

[0026] Proportion: the thickness of aluminum foil is 0.2mm, the thickness of carbon fiber is 0.1mm, the thickness of conductive polymer is 0.05mm, and the mass ratio of aluminum foil and carbon fiber is 1:1;

[0027] Preparation method: wrapping aluminum foil, conductive polymer and carbon fiber in turn outside the insulation layer to form a multi-layer composite shielding structure;

[0028] S4, sheath layer

[0029] Material selection: the sheath layer uses a blend of polyether ether ketone and polytetrafluoroethylene, and adds nano-alumina and nano-ceramic particles;

[0030] Proportion: polyether ether ketone and tetrafluoroethylene are mixed in a mass ratio of 7:3, and 10% of nano-alumina and 5% of nano-ceramic particles are added;

[0031] Preparation method: by extrusion process, the blend of polyether ether ketone and tetrafluoroethylene and nano-alumina and nano-ceramic particles are uniformly mixed to form a sheath layer;

[0032] S5, self-repairing anticorrosive coating

[0033] Material selection: the coating contains microcapsules;

[0034] Proportion: the self-repairing anticorrosive coating is composed of base material, auxiliary material and microcapsules, wherein the mass of the microcapsules accounts for 20% of the total mass of the coating.

[0035] According to one embodiment of the present application, the shielding layer adopts plasma treatment technology to perform surface treatment on the conductor and the insulating layer in the overmolding process.

[0036] According to one embodiment of the present application, the specific manufacturing method of the self-repairing anticorrosive coating is as follows:

[0037] Raw materials:

[0038] (1) Microcapsules:

[0039] Capsule core material: light-responsive self-repairing agent, accounting for 10% of the total mass;

[0040] Wall material: blend of polymethyl methacrylate and polyether amine, accounting for 10% of the total mass;

[0041] (2) Base material:

[0042] Epoxy resin: as the base material, accounting for 50% of the total mass;

[0043] Biomimetic material: polyaniline, accounting for 20% of the total mass;

[0044] (3) Auxiliary material:

[0045] Toughening agent: polyamide resin, accounting for 5% of the total mass;

[0046] Leveling agent: polyether modified polysiloxane, accounting for 2.5% of the total mass;

[0047] Anti-settling agent: fumed silica, accounting for 2.5% of the total mass;

[0048] (4) Manufacturing method

[0049] Preparation of microcapsules:

[0050] The light-responsive self-repairing agent is used as the capsule core, and the microcapsules are formed by wrapping with emulsifiers and curing agents, and the blend of polymethyl methacrylate and polyether amine is used as the wall material;

[0051] Preparation of composite film:

[0052] Selection of porous support: polyacrylonitrile ultrafiltration membrane is selected as the porous support;

[0053] Preparation of aqueous phase: polyether amine is dissolved in deionized water to prepare an aqueous phase solution with a concentration of 0.0225 mol / L;

[0054] Preparation of organic phase: dissolve trimesoyl chloride in n-hexane to prepare an organic phase solution with a concentration of 0.0075 mol / L;

[0055] Reaction process:

[0056] Cut the porous support into appropriate size, immerse it in the aqueous phase solution, and dry for thirty minutes;

[0057] Immerse the dried support in the organic phase solution and keep for ten minutes, so that the two monomers can occur polymerization reaction at the interface to form a dense polymer skin;

[0058] After the reaction is completed, the support is taken out, washed with deionized water and organic solvent respectively to remove unreacted monomers and by-products, form a composite membrane, and the generated composite membrane is heat treated;

[0059] Mixing with paint:

[0060] Cut the prepared composite membrane into appropriate size, then mix the epoxy resin with polyaniline, add microcapsules, composite membrane, toughening agent, leveling agent and anti-settling agent after uniform stirring, continue to stir until uniform to form a self-repairing anticorrosive coating;

[0061] Coating process:

[0062] Uniformly coat the self-repairing anticorrosive coating containing the composite membrane on the surface of the sheath layer, and ensure that the composite membrane and the paint are fully combined during the coating process to form a uniform coating;

[0063] Curing process:

[0064] Cure the coating by natural drying, and during the curing process, the composite membrane and other components in the paint jointly form a complete self-repairing anticorrosive coating.

[0065] (Three) beneficial effects

[0066] The application provides a high-strength corrosion-resistant power cable and a preparation method thereof.

[0067] The high-strength corrosion-resistant power cable and the preparation method thereof, in the normal working state, the conductor is in a dispersed state, which greatly reduces the overall temperature of the cable during work, and the working environment of the cable is combined with the water flow and the dispersed conductor to cooperate with each other, which further ensures that the cable works in a low-temperature state, thereby greatly improving the service life of the cable, avoiding the problem that the sheath layer is expanded and broken due to uneven cold and hot expansion, resulting in water entering the inside, and at the same time, when the cable works, the cavity is filled with insulating oil, and the flow cavity in the sheath layer is also filled with insulating oil through the communication pipe, the insulating oil can fill the gap inside the cable, form a liquid insulation layer, improve the insulation performance of the cable, prevent water and corrosive substances from entering, and also provide certain lubricating effect, reduce the friction and wear inside the cable, and when the working depth of the cable in water is greater, the water pressure effect on the cable is stronger, that is, the extrusion force on the extrusion cavity is greater, so that the thin wall outside the center tube extrusion cavity is extruded and shrunk, and then the internal gas pressure is delivered to the internal cavity of the support tube, and the thin wall of the center tube is shrunk by water pressure, and then the sheath layer is firmly pulled and attached to the outer surface of the center tube, thereby greatly improving the overall working stability of the cable, avoiding the sheath layer from being separated from the connection with the center tube when the water pressure is high, and the internal cavity gas pressure of the support tube increases and pushes the sheath layer to the two sides, thereby cooperating with the extrusion cavity, further making the sheath layer firmly attached to the outer surface of the center tube, further improving the working stability of the cable, and at the same time, the two sides of the sheath layer are supported by pressure, avoiding the sheath layer from being bent, thereby greatly improving the protection effect on the internal conductor.

[0068] (ii) The high-strength corrosion-resistant power cable and its preparation method, by adopting three-dimensional network carbon phase reinforced copper-based composite material as the conductor, which is different from the existing technology that the conductor adopts pure copper or ordinary copper alloy, combining the reinforcing effect of chopped carbon fibers and carbon nanotubes, while maintaining good electrical conductivity, significantly improving the mechanical strength and corrosion resistance of the cable, the sheath layer adopts a blend of polyether ether ketone and polytetrafluoroethylene, and adds nano fillers such as nano aluminum oxide and nano ceramic particles, further enhancing the corrosion resistance and mechanical strength of the cable, the insulation layer uses nano-silicon dioxide modified ethylene-tetrafluoroethylene copolymer and adds graphene, improving the insulation performance, thermal conductivity and corrosion resistance, a self-repairing corrosion-resistant coating is coated on the surface of the sheath layer, which contains microcapsules that can actively repair surface damage, prolong the service life of the cable, the shielding layer adopts a multi-layer composite structure, including aluminum foil, conductive polymer and carbon fiber, improving the shielding effect and corrosion resistance, while the sheath layer in the existing technology usually does not have self-repairing function, but the process coats a self-repairing corrosion-resistant coating on the surface of the sheath layer, which can actively repair surface damage, prolong the service life of the cable, reduce maintenance costs, and the existing technology usually lacks precise control of surface treatment and temperature and pressure, but the process uses plasma treatment technology and strictly controls the temperature and pressure during the extrusion process, improving the adhesion and corrosion resistance between the layers of materials, ensuring the overall performance of the cable.

[0069] (iii) The high-strength corrosion-resistant power cable and its preparation method, using interfacial polymerization to prepare a self-repairing corrosion-resistant coating, the coating contains microcapsules with good wall material density, which can effectively prevent water molecules from invading, by adding a composite film as an outer protective film, preventing direct contact of corrosive media such as seawater with the cable, effectively resisting seawater erosion and prolonging the service life of the cable, when the sheath layer surface has minor scratches or damage due to external force or long-term use, the microcapsules in the composite film rupture and release a light-responsive self-repairing agent, which cooperates with the biomimetic material in the matrix material to form a protective film, achieving self-repairing function and ensuring long-term stable operation of the cable in the submarine environment, while the composite film has a certain mechanical strength and can resist physical impact and friction that may be encountered during the laying and use of submarine cables, protecting the internal structure of the cable from damage. BRIEF DESCRIPTION OF DRAWINGS

[0070] Figure 1 is a structural schematic diagram of the whole of the present application;

[0071] Figure 2 is a structural schematic diagram of the central tube of the present application;

[0072] Figure 3 is a structural schematic diagram of the support tube of the present application;

[0073] Figure 4 is a structural schematic diagram of the extrusion cavity of the present application;

[0074] Figure 5 Figure is a structural diagram of the positioning strip of the present application.

[0075] In the figure: 1, central tube; 2, sheath layer; 3, shielding layer; 4, insulation layer; 5, conductor; 6, flow cavity; 7, injection cavity; 8, communication pipe; 9, stabilizing pipe; 10, positioning strip; 11, through hole; 12, extrusion cavity; 13, support pipe; 14, elastic metal mesh. DETAILED DESCRIPTION

[0076] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0077] As Figures 1 to 5 shown, the present application provides a technical solution: a high-strength corrosion-resistant power cable, comprising a central tube 1 made of ceramic silicone rubber, further comprising:

[0078] a sheath layer 2, the outer surface of the sheath layer 2 is fixedly connected to the outer surface of the central tube 1, and the sheath layer 2 is provided at a fixed interval around the central axis of the central tube 1 and has five;

[0079] a shielding layer 3, the shielding layer 3 is arranged inside the sheath layer 2, and the shielding layer 3 is arranged on the same central axis as the sheath layer 2;

[0080] an insulation layer 4, the outer surface of the insulation layer 4 is fixedly sleeved on the inner surface of the shielding layer 3;

[0081] a conductor 5, the conductor 5 is fixedly sleeved on the inner surface of the insulation layer 4.

[0082] The sheath layer 2 and the shielding layer 3 are provided with a flow cavity 6, the central tube 1 is provided with an injection cavity 7 penetratingly arranged inside, the inner surface of the injection cavity 7 is fixedly communicated with a communication pipe 8, the outer end of the communication pipe 8 is in communication with the flow cavity 6 through the sheath layer 2, and the injection cavity 7 and the flow cavity 6 are filled with insulating oil.

[0083] The inner end of the communication pipe 8 is fixedly communicated with a stabilizing pipe 9, and the outer surface of the stabilizing pipe 9 is fixedly connected to the inner surface of the injection cavity 7.

[0084] The inner surface of the sheath layer 2 is fixedly connected with a positioning strip 10, the positioning strip 10 is provided at a fixed interval on the inner surface of the same sheath layer 2 and has five, and the side surface of the positioning strip 10 is provided with a through hole 11 penetratingly arranged.

[0085] The wall of the center tube 1 is provided with extrusion cavities 12, five of which are arranged at a fixed interval around the central axis of the center tube 1, and the two side outer surfaces of the sheath layer 2 are symmetrically and fixedly connected with support tubes 13.

[0086] The five support tubes 13 are arranged as a group, and the support tubes 13 in the same group are combined into a near-circular ring shape, the adjacent sheath layers 2 are fixedly connected through the support tubes 13, the inner wall of the support tube 13 is attached with an elastic metal mesh 14, and the internal cavity of the support tube 13 is in communication with the extrusion cavities 12.

[0087] A preparation method of a high-strength corrosion-resistant power cable, comprising the following steps:

[0088] S1, conductor 5:

[0089] Material selection: a three-dimensional network carbon phase reinforced copper-based composite material is used as the material of the conductor 5;

[0090] Proportioning: short carbon fibers: carbon fibers with lengths of 15 mm, 6.5 mm and 5.5 mm are composed of 0.4 times b, b and 0.6 times b in mass ratio, wherein b is the mass of the middle length carbon fiber;

[0091] Carbon nanotubes: the mass is 13.5% of the mass of the short carbon fiber;

[0092] Copper matrix: the mass ratio of copper, nickel and chromium is 102:2.2:1.2;

[0093] Preparation method: using vacuum impregnation hot pressing forming process, short carbon fiber and carbon nanotube preform and copper alloy powder or copper powder are sintered in graphite mold, heated to copper alloy or copper melting, and kept for 30 minutes, protective gas is introduced, pressure is kept, and composite material is obtained after cooling;

[0094] S2, insulation layer 4

[0095] Material selection: using nano-silicon dioxide modified ethylene-tetrafluoroethylene copolymer as the material of the insulation layer 4, and adding graphene;

[0096] Proportioning: nano-silicon dioxide and ethylene-tetrafluoroethylene copolymer are mixed in a mass ratio of 1:100, and 10% of graphene is added;

[0097] Preparation method: by blending extrusion process, nano-silicon dioxide, graphene and ethylene-tetrafluoroethylene copolymer are uniformly mixed, and a uniform insulation layer 4 is formed on the surface of the conductor 5 by extrusion coating process;

[0098] S3, shielding layer 3

[0099] Material selection: a multi-layer composite shielding structure is adopted, including aluminum foil and carbon fiber, and a layer of conductive polymer is added between the aluminum foil and the carbon fiber;

[0100] The ratio of the thickness of the aluminum foil is 0.2 mm, the thickness of the carbon fiber is 0.1 mm, the thickness of the conductive polymer is 0.05 mm, and the mass ratio of the aluminum foil and the carbon fiber is 1:1.

[0101] The preparation method is to wrap the aluminum foil, the conductive polymer and the carbon fiber outside the insulating layer 4 in sequence to form a multi-layer composite shielding structure.

[0102] S4, sheath layer 2

[0103] Material selection: the sheath layer 2 uses a blend of polyether ether ketone and polytetrafluoroethylene, and adds nano-alumina and nano-ceramic particles.

[0104] The ratio of polyether ether ketone and tetrafluoroethylene is 7:3 by mass, and 10% nano-alumina and 5% nano-ceramic particles are added.

[0105] Preparation method: the blend of polyether ether ketone and tetrafluoroethylene and nano-alumina and nano-ceramic particles are uniformly mixed by extrusion process to form the sheath layer 2.

[0106] S5, self-repairing anticorrosive coating

[0107] Material selection: the coating contains microcapsules.

[0108] The ratio of the self-repairing anticorrosive coating is composed of matrix material, auxiliary material and microcapsules, and the mass of the microcapsules accounts for 20% of the total mass of the coating.

[0109] In the extrusion process, the shielding layer 3 uses plasma treatment technology to treat the surface of the conductor 5 and the insulating layer 4.

[0110] The specific preparation method of the self-repairing anticorrosive coating is:

[0111] Raw materials:

[0112] (1) microcapsules:

[0113] Capsule core material: light-responsive self-repairing agent, accounting for 10% of the total mass;

[0114] Wall material: a blend of polymethyl methacrylate and polyether amine, accounting for 10% of the total mass;

[0115] (2) matrix material:

[0116] Epoxy resin: as the matrix material, accounting for 50% of the total mass;

[0117] Biomimetic material: polyaniline, accounting for 20% of the total mass;

[0118] (3) auxiliary material:

[0119] Toughening agent: polyamide resin, 5% of the total mass;

[0120] Leveling agent: polyether modified polysiloxane, 2.5% of the total mass;

[0121] Anti-settling agent: fumed silica, 2.5% of the total mass;

[0122] (4) Preparation method

[0123] Preparation of microcapsules:

[0124] The light-responsive self-repairing agent is used as the capsule core, which is wrapped by emulsifiers and curing agents to form microcapsules, and a blend of polymethyl methacrylate and polyether amine is used as the wall material;

[0125] Preparation of composite film:

[0126] Selection of porous support: polyacrylonitrile ultrafiltration membrane is selected as the porous support;

[0127] Preparation of aqueous phase: polyether amine is dissolved in deionized water to prepare an aqueous phase solution with a concentration of 0.0225 mol / L;

[0128] Preparation of organic phase: trimesoyl chloride is dissolved in n-hexane to prepare an organic phase solution with a concentration of 0.0075 mol / L;

[0129] Reaction process:

[0130] Cut the porous support to an appropriate size, immerse it in the aqueous phase solution, and dry for thirty minutes;

[0131] Immerse the dried support in the organic phase solution and keep it for ten minutes, so that the two monomers can undergo polymerization reaction at the interface to form a dense polymer skin;

[0132] After the reaction is completed, the support is taken out and washed with deionized water and organic solvent respectively to remove unreacted monomers and by-products, forming a composite film, and the generated composite film is subjected to heat treatment;

[0133] Mixing with paint:

[0134] Cut the prepared composite film to an appropriate size, then mix the epoxy resin with polyaniline, stir uniformly, and then add the microcapsules, composite film, toughening agent, leveling agent, and anti-settling agent, continue to stir until uniform, forming a self-repairing anticorrosive paint;

[0135] Coating process:

[0136] Uniformly coat the self-repairing anticorrosive paint containing the composite film on the surface of the sheath layer 2, and during the coating process, ensure that the composite film is fully combined with the paint to form a uniform coating;

[0137] Curing process:

[0138] The coating is cured by natural drying, and during the curing process, the composite film and other components in the paint work together to form a complete self-repairing anticorrosive coating.

[0139] When working, after the connection of the cable is completed, it can be put into water. In the normal working state, the conductor 5 is in a dispersed state, which greatly reduces the overall temperature of the cable during work. Combined with the working environment of the cable, the water flow and the dispersed conductor 5 cooperate with each other, further ensuring that the cable is in a low-temperature state during work, thereby greatly improving the service life of the cable, avoiding the problem that the sheath layer 2 is expanded and broken due to uneven cold and hot expansion, resulting in water entering the inside, and at the same time, when the cable is working, the injection cavity 7 is filled with insulating oil, and through the communication pipe 8, the flow cavity 6 in the sheath layer 2 is also filled with insulating oil. The insulating oil can fill the gap inside the cable to form a liquid insulation layer 4, improve the insulation performance of the cable, prevent water and corrosive substances from entering, and also provide certain lubrication effect to reduce the friction and wear inside the cable. When the working depth of the cable in water is greater, the water pressure effect on the cable is also stronger, which makes the extrusion cavity 12 receive greater extrusion force, thereby extruding and shrinking the thin wall outside the extrusion cavity 12 of the center pipe 1, and then conveying the internal gas pressure to the internal cavity of the support pipe 13. After the thin wall of the center pipe 1 is extruded and shrunk by water pressure, it is concave inward, thereby tightly pulling and attaching the sheath layer 2 to the outer surface of the center pipe 1, thereby greatly improving the overall working stability of the cable, avoiding the sheath layer 2 from being separated from the center pipe 1 when the water pressure is high, and the internal cavity gas pressure of the support pipe 13 increases and pushes the sheath layer 2 to the two sides, thereby cooperating with the extrusion cavity 12 to further make the sheath layer 2 tightly attached to the outer surface of the center pipe 1, further improving the working stability of the cable, and at the same time, the pressure support is provided to both sides of the sheath layer 2 to avoid the sheath layer 2 from being bent, thereby greatly improving the protection effect of the internal conductor 5.

[0140] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual such relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0141] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions and variations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A high strength corrosion resistant power cable comprising a central tube (1) characterised in that: The center pipe (1) is made of ceramic silicone rubber, and further comprises: A sheath layer (2) is fixedly connected to the outer surface of the center pipe (1) by inlaying, and five sheath layers (2) are fixedly arranged at intervals around the central axis of the center pipe (1); A shielding layer (3) is arranged inside the sheath layer (2), and the shielding layer (3) is arranged on the same central axis as the sheath layer (2); An insulating layer (4) is fixedly sleeved on the inner surface of the shielding layer (3); A conductor (5) is fixedly sleeved on the inner surface of the insulating layer (4); A flow cavity (6) is arranged between the sheath layer (2) and the shielding layer (3), an injection cavity (7) is arranged through the center pipe (1), the inner surface of the injection cavity (7) is fixedly and continuously connected to a communication pipe (8), the outer end of the communication pipe (8) is continuously connected to the flow cavity (6) through the sheath layer (2), and the injection cavity (7) and the flow cavity (6) are filled with insulating oil; The inner end of the communication pipe (8) is fixedly and continuously connected to a stabilizing pipe (9), and the outer surface of the stabilizing pipe (9) is fixedly connected to the inner surface of the injection cavity (7); The inner surface of the sheath layer (2) is fixedly connected to a positioning strip (10), and five positioning strips (10) are fixedly arranged at intervals on the inner surface of the same sheath layer (2), and a through hole (11) is arranged through the side surface of the positioning strip (10).

2. A high strength corrosion resistant power cable according to claim 1, characterized in that: An extrusion cavity (12) is arranged through the wall of the center pipe (1), and five extrusion cavities (12) are fixedly arranged at intervals around the central axis of the center pipe (1), and support pipes (13) are fixedly connected to the outer surfaces of the two sides of the sheath layer (2).

3. A high strength corrosion resistant power cable according to claim 2, characterized in that: The five support pipes (13) are arranged in a group, the support pipes (13) in the same group are combined into a near-circular ring, adjacent sheath layers (2) are fixedly connected by the support pipes (13), and the inner wall of the support pipe (13) is attached to an elastic metal mesh (14), and the inner cavity of the support pipe (13) is in communication with the extrusion cavity (12).

4. A method for preparing a high-strength corrosion-resistant power cable, comprising the high-strength corrosion-resistant power cable according to claim 1, characterized in that: The method comprises the following steps: S1, conductor (5): Material selection: three-dimensional network carbon phase reinforced copper-based composite material is used as the material of the conductor (5); Proportioning: short carbon fibers with lengths of 15mm, 6.5mm and 5.5mm are composed of 0.4 times b, b and 0.6 times b in mass ratio, wherein b is the mass of the middle length carbon fiber; Carbon nanotubes: the mass of the carbon nanotubes is 13.5% of the mass of the short carbon fibers; Copper matrix: the mass ratio of copper, nickel and chromium is 102:2.2:1.2; Preparation method: short carbon fibers and carbon nanotube preforms and copper alloy powder or copper powder are sintered in a graphite mold, heated to copper alloy or copper melting, and kept for 30 minutes, protective gas is introduced, pressure is kept, and the composite material is obtained after cooling; S2, insulating layer (4) Material selection: nano-silicon dioxide modified ethylene-tetrafluoroethylene copolymer is used as the material of the insulating layer (4), and graphene is added. Material selection: The nano-silicon dioxide and the ethylene-tetrafluoroethylene copolymer are mixed in a mass ratio of 1:100, and then 10% of graphene is added; Preparation method: The nano-silicon dioxide, graphene and ethylene-tetrafluoroethylene copolymer are uniformly mixed through a blending extrusion process, and a uniform insulating layer (4) is formed on the surface of the conductor (5) through an extrusion coating process; S3, shielding layer (3) Material selection: A multi-layer composite shielding structure is adopted, including aluminum foil and carbon fiber, and a layer of conductive polymer is added between the aluminum foil and the carbon fiber; Proportioning: The thickness of the aluminum foil is 0.2mm, the thickness of the carbon fiber is 0.1mm, the thickness of the conductive polymer is 0.05mm, and the mass ratio of the aluminum foil and the carbon fiber is 1:1; Preparation method: The aluminum foil, the conductive polymer and the carbon fiber are successively wrapped around the insulating layer (4) to form a multi-layer composite shielding structure; S4, sheath layer (2) Material selection: The sheath layer (2) adopts a blend of polyether ether ketone and polytetrafluoroethylene, and adds nano-alumina and nano-ceramic particles; Proportioning: The polyether ether ketone and tetrafluoroethylene are mixed in a mass ratio of 7:3, and then 10% of nano-alumina and 5% of nano-ceramic particles are added; Preparation method: The blend of polyether ether ketone and tetrafluoroethylene and nano-alumina and nano-ceramic particles are uniformly mixed through an extrusion process to form the sheath layer (2); S5, self-repairing anticorrosive coating Material selection: The coating contains microcapsules; Proportioning: The self-repairing anticorrosive coating is composed of base material, auxiliary material and microcapsules, and the mass of the microcapsules accounts for 20% of the total mass of the coating.

5. A process for the preparation of a high strength corrosion resistant power cable according to claim 4, characterized in that: In the extrusion coating process, the shielding layer (3) adopts plasma treatment technology to perform surface treatment on the conductor (5) and the insulating layer (4).

6. A process for the preparation of a high strength corrosion resistant power cable according to claim 5, characterized in that: The specific preparation method of the self-repairing anticorrosive coating is as follows: Raw materials: (1) Microcapsules: Core material: Light-responsive self-repairing agent, accounting for 10% of the total mass; Wall material: Blend of polymethyl methacrylate and polyether amine, accounting for 10% of the total mass; (2) Base material: Epoxy resin: As the base material, accounting for 50% of the total mass; Biomimetic material: Polyaniline, accounting for 20% of the total mass; (3) Auxiliary material: Toughening agent: Polyamide resin, accounting for 5% of the total mass; Leveling agent: Polyether modified polysiloxane, accounting for 2.5% of the total mass; Anti-settling agent: Fumed silica, accounting for 2.5% of the total mass; (4) Preparation method Preparation of microcapsules: The light-responsive self-repairing agent is used as the core of the microcapsules, which is wrapped by emulsifiers and curing agents to form microcapsules, and the blend of polymethyl methacrylate and polyether amine is used as the wall material; Preparation of composite membrane: Selection of porous support: Polyacrylonitrile ultrafiltration membrane is selected as the porous support; Preparation of aqueous phase: Polyether amine is dissolved in deionized water to prepare an aqueous phase solution with a concentration of 0.0225mol / L; Preparation of organic phase: Triformylbenzene chloride is dissolved in n-hexane to prepare an organic phase solution with a concentration of 0.0075mol / L; Reaction process: The porous support is cut to an appropriate size, immersed in the aqueous phase solution and dried for thirty minutes; The dried support is immersed in the organic phase solution for ten minutes, so that the two monomers undergo polymerization reaction at the interface to form a dense polymer skin layer; After the reaction is completed, the support is taken out and washed with deionized water and an organic solvent respectively to remove unreacted monomers and by-products, form a composite film, and the generated composite film is subjected to heat treatment; Mixing with paint: The prepared composite film is cut to an appropriate size, then the epoxy resin is mixed with polyaniline, after uniform stirring, microcapsules, composite film, toughening agent, leveling agent and anti-settling agent are added, and continue to stir until uniform to form a self-repairing anticorrosive coating; Coating process: The self-repairing anticorrosive coating containing the composite film is uniformly coated on the surface of the sheath layer (2), and during the coating process, the composite film is ensured to be fully combined with the coating to form a uniform coating; Curing process: The coating is cured by natural drying, and during the curing process, the composite film and other components in the coating jointly form a complete self-repairing anticorrosive coating.

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