High-conductivity flame-retardant ultrahigh-voltage cable

Abstract

The invention provides a high-conductivity flame-retardant ultrahigh-voltage cable, and relates to the technical field of power transmission, the high-conductivity flame-retardant ultrahigh-voltage cable comprises a wire harness structure and a protection structure sleeving the wire harness structure, and the two ends of the protection structure are detachably connected with tightening sleeves; the protection structure comprises an outer sheath, a spiral protection layer and an inner protection layer; the inner sheath is fixed on the inner wall of the outer sheath, the inner sheath sleeves the wire harness structure, and the spiral sheath is of a threaded strip-shaped structure fixed on the outer wall of the outer sheath and is used for protecting the outer sheath; the tightening sleeve comprises an extrusion shell, an extrusion sheet and an abutting block; and the extrusion sheets are fixed at one end of the extrusion shell at equal intervals. According to the high-conductivity flame-retardant ultra-high-voltage cable, through collaborative innovation, stability optimization of the end portion and the overall structure of the cable, significant improvement of electrical performance and environmental adaptability and comprehensive improvement of installation convenience and operation efficiency are achieved, and therefore the comprehensive performance and long-term reliability of the cable in ultra-high-voltage power transmission application are significantly enhanced.

Description

Technical Field

[0001] This invention relates to the field of power transmission technology, and in particular to a high-conductivity, flame-retardant, ultra-high voltage cable. Background Technology

[0002] As a core component for long-distance, high-capacity power transmission, ultra-high voltage (UHV) power cables directly impact the reliability, efficiency, and safety of the power grid. With the construction and development of UHV transmission networks, offshore wind power, data centers, and large urban power grids, higher comprehensive performance requirements are being placed on UHV cables: they must not only possess extremely high conductivity to reduce transmission losses, but also meet stringent safety and environmental standards such as flame retardancy, fire resistance, low smoke, and halogen-free properties. Furthermore, they must have a compact structure, excellent mechanical properties, convenient installation, and stable long-term operation.

[0003] In existing technologies, conventional ultra-high voltage cables typically consist of a layered structure including a conductor, conductor shield, insulation, insulation shield, metal sheath (armor), and outer sheath. While these structures meet basic power transmission requirements to a certain extent, the following technical bottlenecks still urgently need to be addressed when facing complex application scenarios: Insufficient cable end treatment and overall structural stability: After cables are cut at the laying site, the various structural layers at the ends (such as the outer sheath, armor layer, and insulated cores) lose their factory-prefabricated overall constraint, making them prone to loosening and delamination due to internal stress or external disturbances, resulting in gaps at the interfaces. These gaps not only provide channels for the intrusion of moisture, humidity, and even foreign objects, severely affecting insulation performance and leading to partial discharge or even insulation breakdown, but also reduce the mechanical strength of the cable, affecting its reliable connection with terminal accessories. Existing end treatment methods such as heat shrink tubing, cold shrink tubing, or cable ties have limited sealing and compression effects and are unable to provide continuous and uniform radial constraint force to the multi-layered internal structure of the cable to maintain its integrity.

[0004] The longitudinal water-blocking and mechanical stress buffering design of traditional cables has shortcomings: Longitudinal water blocking in traditional cables mainly relies on water-blocking yarn, water-blocking powder, or semi-conductive water-blocking tape filled in the gaps. These materials are insufficient in terms of water-blocking effect, long-term stability, and compatibility with the cable's thermomechanical properties. For example, the internal mechanical stress generated by thermal expansion and contraction during load changes in the cable, if not effectively buffered, will continue to act on the insulation system, accelerating the aging of the insulation material and affecting the cable's lifespan. Existing structures lack an integrated functional layer that can both effectively prevent longitudinal water penetration and actively absorb and buffer thermomechanical stress.

[0005] The uniformity of the electric field and the high-temperature reliability of conductor shielding and insulation systems need improvement: Under ultra-high voltage environments, electric field distortion on the conductor surface is a key factor in triggering partial discharge. Traditional conductor shielding materials (such as semi-conductive cross-linked polyethylene) still have room for improvement in terms of conductivity uniformity, thermal stability, and bonding tightness with the conductor. Furthermore, for applications requiring fire resistance, mica tape is typically wrapped around the conductor. However, mica tape has low mechanical strength and is easily damaged by cable bending and vibration. The interface bonding between the separately wrapped mica tape layer and the inner and outer layers is a technical challenge; micro-gaps or protrusions at the interface can become electric field concentration points and potential sources of failure.

[0006] The outer sheath has limited functionality and poor environmental adaptability: Conventional outer sheaths primarily provide mechanical protection and basic environmental protection. Their surface is typically coated with a conductive graphite layer for post-laying insulation testing; however, this coating is prone to peeling, polluting the environment, and has poor abrasion resistance, easily wearing away in complex transportation and laying environments, affecting the cable's long-term appearance and protective performance. Simultaneously, heat dissipation design of the outer sheath is often neglected, hindering further increases in current carrying capacity and reductions in operating temperature.

[0007] In summary, existing ultra-high voltage cable technology still faces challenges in terms of multi-performance synergistic optimization, structural integration innovation, and long-term operational reliability. There is an urgent need for an innovative cable design that can systematically solve these problems, achieving a harmonious balance of high conductivity, high flame retardancy, excellent mechanical properties, superior environmental adaptability, and convenient installation and maintenance to meet the stringent requirements of next-generation power infrastructure construction. Summary of the Invention

[0008] To address the technical challenges of existing ultra-high voltage cables failing to achieve high conductivity, high flame retardancy, excellent mechanical properties, superior environmental adaptability, and convenient installation and maintenance, this invention provides a high conductivity, flame retardant, ultra-high voltage cable.

[0009] The technical solutions provided by the embodiments of the present invention are as follows: This invention provides a high-conductivity, flame-retardant, ultra-high voltage cable, comprising: a wire harness structure and a protective structure sleeved outside the wire harness structure, wherein both ends of the protective structure are detachably connected to a tightening sleeve; The protective structure includes an outer sheath, a spiral protective layer, and an inner protective layer; The inner protective layer is fixed to the inner wall of the outer sheath, and the inner protective layer is also sleeved on the wire harness structure. The spiral protective layer is a threaded strip structure fixed to the outer wall of the outer sheath and is used to protect the outer sheath. The tightening sleeve includes a compression shell, a compression piece, and an abutment block; The extrusion plates are fixed at equal intervals at one end of the extrusion shell, and the abutment block is fixed on the inner wall of the extrusion plate at the end away from the extrusion shell. When the extrusion shell is disassembled and connected to the end of the outer sheath, the extrusion plates drive the abutment block to press the end of the outer sheath, so that the outer sheath drives the inner sheath to tightly wrap around the wire harness structure. The protective structure has a support bar inside, and the wire harness structure has multiple support bars distributed around the support bar. The support bar is elastic. When the tightening sleeve moves the end of the protective structure to fit the wire harness structure, the support bar is squeezed by the tightening sleeve. The support bar supports the wire harness structure with its own restoring force, thereby making the wire harness structure firmly connected in the protective structure.

[0010] The inner protective layer includes an armor layer, an inner sheath, and an outer filler layer; The outer filling layer is distributed in multiple layers around the support strip, and the multiple outer filling layers form a tubular structure. The tubular structure formed by the multiple outer filling layers wraps around the wire harness structure. The inner sheath is fitted on the outer wall of the tubular structure formed by the multiple outer filling layers. The armor layer is fitted on the outer wall of the inner sheath. The outer sheath is fitted on the outer wall of the armor layer.

[0011] The extrusion sheet is integrally fixed with the extrusion shell, and the part where the extrusion sheet and the extrusion shell are connected is provided with rounded corners. A notch is provided between every two extrusion sheets.

[0012] The abutment block has rounded corners near the spiral protective layer. The abutment block is integrally fixed to the inner wall of the extrusion sheet. The abutment block is in contact with the outer sheath and the spiral protective layer.

[0013] The inner wall of the extrusion shell is provided with internal threads, which are engaged with the spiral protective layer threads. The extrusion shell is a circular tube structure.

[0014] A sealing ring is fixed to the inner wall of the extrusion shell at the end opposite to the extrusion sheet. The sealing ring is elastic and contacts the outer sheath and the spiral protective layer. A connecting ring is fixed to the outer wall of the extrusion shell at the end opposite to the extrusion sheet.

[0015] The wire harness structure includes copper wires, a shielding tube, and a support component; The copper wires are distributed in multiple ways, and each copper wire has a shielding tube sleeved on its outer wall. The shielding tubes are inserted into the support in a dot matrix pattern.

[0016] The support component includes a cable conduit, an insulating shielding layer, and an inner filling layer; An insulating shielding layer is fitted onto the outer wall of the inner filling layer, and a cable conduit is fitted onto the outer wall of the insulating shielding layer. The shielding conduit is inserted into the inner wall of the inner filling layer.

[0017] The outer wall of the cable conduit is rough, and the side of the support strip that contacts the cable conduit has a groove, in which the cable conduit is embedded.

[0018] The support strips and cable conduits are both distributed inside the outer filling layer. The support strips are used to support the cable conduits. The side of the outer filling layer that contacts the cable conduits is also rough. The outer filling layer is elastic.

[0019] The beneficial effects of the technical solutions provided by the embodiments of the present invention include at least the following: In terms of structural stability, moisture-proof sealing, and long-term reliability: This invention achieves a significant improvement in cable end treatment and overall structural performance through an innovative synergistic mechanism of "tightening sleeve-spiral sheath-support bar" and a functionalized filler layer design. Specifically, after cable cutting, tightening the internally threaded tightening sleeve generates continuous and uniform radial pressure on the outer sheath with spiral sheath and the inner armor layer through its internal compression plates and abutment blocks. This effectively prevents delamination of the structural layers due to end loosening and eliminates channels for moisture and foreign matter intrusion. Simultaneously, the compressed elastic support bar generates a reverse support force, firmly securing the internal wire harness structure and forming a dynamically adaptive internal fixation. Combined with an outer filler layer using graphene aerogel components, possessing both superhydrophobic and high elasticity properties, it not only provides an excellent longitudinal water barrier but also offers crucial buffer space for thermal expansion and contraction during cable operation, significantly reducing the cyclic mechanical stress on the insulation system. These designs collectively ensure the structural integrity and long-term operational reliability of the cable, especially at weak points such as the cable ends, under complex operating conditions.

[0020] In terms of electrical performance, safety protection, and environmental adaptability: This invention achieves multiple optimizations in high conductivity, uniform electric field, high-temperature fire resistance, and robust protection through synergistic innovation in material systems and composite structures. The core lies in the use of multi-layer graphene composite technology: the conductor uses high-conductivity oxygen-free annealed copper; the conductor shield employs a three-layer co-extrusion structure of wrapped graphene conductive cloth and extruded graphene semi-conductive material, ensuring a smooth, gapless bond with the conductor and main insulation, greatly optimizing the electric field distribution and suppressing partial discharge. The mica tape shielding tube provides a high-temperature fire-resistant barrier while being tightly encapsulated and protected by the inner filling layer and insulating shielding layer, solving its mechanical fragility problem. The outer sheath uses low-smoke halogen-free flame-retardant polyolefin that meets environmental and safety requirements, while its surface-coated polymer wear-resistant conductive coating replaces the easily detachable traditional graphite powder, providing stable surface conductivity for grounding detection while significantly enhancing the wear resistance of the outer sheath. The corrugated aluminum sheath armor layer endows the cable with excellent resistance to mechanical impact and flexibility. These measures comprehensively improve the cable's transmission efficiency, short-circuit capacity, fire safety, and durability in harsh environments.

[0021] In terms of ease of installation, heat dissipation performance, and system adaptability: This invention, through its user-friendly and functional integrated design, reduces construction complexity and enhances the overall performance of the cable. The standardized threaded connection of the tightening sleeve makes sealing and reinforcing the cable ends as simple and quick as tightening a nut, requiring no complex tools or special processes, greatly improving on-site construction efficiency and consistency. The spiral sheath on the outer sheath not only serves as the load-bearing structure of the tightening sleeve but also naturally increases the heat dissipation area of ​​the cable surface, promoting heat dissipation during operation and improving the cable's actual current carrying capacity. The rough surface and groove design between the internal elastic support strip and the cable conduit and outer filling layer allows for a certain relative displacement space between the copper wires while ensuring stable support, enhancing the overall flexibility and bending resistance of the cable. This design, integrating convenient installation, auxiliary heat dissipation, and a flexible structure, makes the cable of this invention easier to lay and maintain, and better adaptable to the requirements of various laying environments such as ducts, cable trays, and direct burial. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the connection structure between the cable tube and the outer filling layer in a high-conductivity, flame-retardant ultra-high voltage cable provided in an embodiment of the present invention.

[0024] Figure 2 for Figure 1 A schematic diagram of the end portion.

[0025] Figure 3 This is a schematic diagram of the structure of a high-conductivity, flame-retardant, ultra-high voltage cable provided in an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the connection structure between the cable tube and the support bar in a high-conductivity, flame-retardant, ultra-high voltage cable provided in an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the connection structure between the cable conduit and the insulating shielding layer in a high-conductivity, flame-retardant ultra-high voltage cable provided in an embodiment of the present invention.

[0028] Figure 6 This is a connection structure diagram of a sealing ring and an extruded shell in a high-conductivity, flame-retardant ultra-high voltage cable provided in an embodiment of the present invention.

[0029] Reference numerals: 1. Outer sheath; 11. Spiral sheath; 12. Armor layer; 13. Inner sheath; 14. Outer filling layer; 15. Support strip; 2. Cable conduit; 21. Insulating shielding layer; 22. Inner filling layer; 23. Shielding tube; 3. Copper wire; 4. Extruded shell; 41. Connecting ring; 42. Internal thread; 43. Notch; 44. Abutment block; 45. Sealing ring; 46. Extruded piece.

[0030] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0031] The technical solutions of the present invention will now be described with reference to the accompanying drawings. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies. Furthermore, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0032] like Figures 1 to 6 As shown, an embodiment of the present invention provides a high conductivity, flame-retardant ultra-high voltage cable, comprising: a wire harness structure and a protective structure sleeved outside the wire harness structure, wherein both ends of the protective structure are detachably connected to a tightening sleeve; The protective structure includes an outer sheath 1, a spiral protective layer 11, and an inner protective layer; The inner sheath is fixed to the inner wall of the outer sheath 1, and at the same time, the inner sheath is sleeved on the wire harness structure. The spiral sheath 11 is a threaded strip structure fixed to the outer wall of the outer sheath 1 and is used to protect the outer sheath 1. The tightening sleeve includes a compression shell 4, a compression piece 46, and an abutment block 44; The extrusion plates 46 are fixed at equal intervals at one end of the extrusion shell 4, and the abutment block 44 is fixed on the inner wall of the extrusion plate 46 away from the extrusion shell 4. When the extrusion shell 4 is disassembled and connected to the end of the outer sheath 1, the extrusion plate 46 drives the abutment block 44 to squeeze the end of the outer sheath 1, so that the outer sheath 1 drives the inner sheath to tightly wrap around the wire harness structure, preventing external objects from entering the gaps in the cable's structural components when the cable is cut and used. The protective structure has a support bar 15 inside. The wire harness structure has multiple support bars 15 distributed around the support bar 15. The support bar 15 is elastic. When the tightening sleeve moves the end of the protective structure to fit the wire harness structure, the support bar 15 is squeezed by the tightening sleeve. The support bar 15 supports the wire harness structure with its own restoring force, thereby making the wire harness structure firmly connected in the protective structure.

[0033] In one possible implementation, the inner sheath includes an armor layer 12, an inner sheath 13, and an outer filler layer 14. The outer filler layer 14 is made of a composite semi-conductive elastic water-blocking material containing graphene aerogel components. This material is lightweight, highly elastic, and superhydrophobic, which can effectively prevent water from penetrating longitudinally and provide a buffer space for thermal expansion and contraction during cable operation, thereby reducing mechanical stress on the insulation system. Multiple outer filling layers 14 are distributed around the support strip 15. Multiple outer filling layers 14 form a tubular structure. The tubular structure formed by multiple outer filling layers 14 wraps the wire harness structure. The inner sheath 13 is fitted on the outer wall of the tubular structure formed by multiple outer filling layers 14. The armor layer 12 is fitted on the outer wall of the inner sheath 13. The outer sheath 1 is fitted on the outer wall of the armor layer 12. Specifically, in actual use, the armor layer 12 uses a corrugated aluminum sheath. The corrugated structure enhances the cable's flexibility and resistance to mechanical impact. It is wrapped around the outside of the inner sheath 13 to increase the cable's rigidity and prevent damage to the internal wire harness structure. The inner sheath 13 and the outer sheath 1 are made of low-smoke halogen-free flame-retardant polyolefin. This material is based on polyolefin polymer and contains environmentally friendly flame retardants (such as aluminum hydroxide and magnesium hydroxide). When burning, it produces only a small amount of smoke and does not release corrosive and toxic gases such as hydrogen halides. It also meets environmental protection and safety requirements. In actual production, the surface of the outer sheath 1 is coated with a layer of polymer wear-resistant conductive coating (such as an epoxy resin and conductive graphite composite coating). This coating replaces the traditional conductive graphite dry powder application, solving the problems of easy peeling and environmental pollution. The coating provides stable surface conductivity (for sheath insulation testing after cable laying) and significantly improves the wear resistance of the outer sheath, preventing wear during transportation and installation. The optimal graphite filling amount of the coating can be controlled at around 10P% to achieve the best balance between conductivity and wear resistance.

[0034] In one possible implementation, the extrusion sheet 46 is integrally fixed with the extrusion shell 4, the part where the extrusion sheet 46 and the extrusion shell 4 are connected is provided with rounded corners, and a notch 43 is provided between every two extrusion sheets 46.

[0035] In one possible implementation, the abutment block 44 is provided with rounded corners near the spiral protective layer 11, the abutment block 44 is integrally fixed to the inner wall of the extrusion sheet 46, and the abutment block 44 is in contact with the outer sheath 1 and the spiral protective layer 11.

[0036] In one possible implementation, the inner wall of the extrusion shell 4 is provided with an internal thread 42, which is threadedly engaged with the spiral protective layer 11, and the extrusion shell 4 is a circular tube structure.

[0037] In one possible implementation, a sealing ring 45 is fixed to the inner wall of the extrusion shell 4 at the end opposite to the extrusion sheet 46. The sealing ring 45 is elastic and contacts the outer sheath 1 and the spiral protective layer 11. A connecting ring 41 is fixed to the outer wall of the extrusion shell 4 at the end opposite to the extrusion sheet 46. Specifically, in actual use, if the staff wants to cut the cable, the wire harness structure and the protective structure are prone to delamination. At this time, objects in the external environment can easily enter between the wire harness structure and the protective structure, thereby damaging the actual service life of the cable and also damaging the connection effect between the cable and external electrical equipment. In order to avoid such phenomena, a tightening sleeve is detached and connected at both ends of the protective structure, and a spiral protective layer 11 is set on the outside of the outer sheath 1. After the cable is cut, the worker rotates the extrusion shell 4 forward on the outer sheath 1. At this time, the internal thread 42 is threadedly connected to the spiral sheath 11. As the worker rotates forward, the outer sheath 1 and the spiral sheath 11 are squeezed by the extrusion plate 46. At this time, the extrusion plate 46 can squeeze the outer sheath 1 and the spiral sheath 11 under its own rigidity, thereby realizing the outer sheath 1 tightening the armor layer 12. At this time, the components of the wire harness structure and the protective structure are squeezed by the extrusion plate 46. This can prevent objects in the external environment from entering between the wire harness structure and the protective structure. Then, the worker passes the wire harness structure through the gap between multiple extrusion plates 46, thus realizing the connection between the wire harness structure and the external electrical equipment. Meanwhile, the spiral sheath 11 can increase the contact area between the cable and the external air, and also improve the heat dissipation effect of the outer sheath 1. When the extrusion sheet 46 extrudes the outer sheath 1 and the armor layer 12, the support strip 15 can provide a reaction force to the wire harness structure by relying on its own elasticity. The support strip 15 can be made of flame-retardant rubber material, thereby achieving stable support of the wire harness structure by the support strip 15, and realizing stable fixation of the wire harness structure inside the protective structure, so that the wire harness structure can stably transmit electrical energy to external electrical equipment.

[0038] In one possible implementation, the wire harness structure includes a copper wire 3, a shielding tube 23, and a support member; There are multiple copper wires 3, and each copper wire 3 has a shielding tube 23 sleeved on its outer wall. The shielding tubes 23 are inserted into the support in a dot matrix pattern.

[0039] In one possible implementation, the support includes a cable conduit 2, an insulating shielding layer 21, and an inner filling layer 22; An insulating shielding layer 21 is sleeved on the outer wall of the inner filling layer 22, and a cable tube 2 is sleeved on the outer wall of the insulating shielding layer 21. The shielding tube 23 is inserted into the inner wall of the inner filling layer 22.

[0040] In one possible implementation, the outer wall of the cable conduit 2 is rough, and the side of the support bar 15 that contacts the cable conduit 2 has a groove, with the cable conduit 2 embedded in the groove of the support bar 15.

[0041] In one possible implementation, the support strip 15 and the cable tube 2 are both distributed inside the outer filling layer 14. The support strip 15 is used to support the cable tube 2. The side of the outer filling layer 14 that contacts the cable tube 2 is also rough. The outer filling layer 14 is elastic. Specifically, in actual use, the copper wire 3 can be an oxygen-free annealed copper conductor with a conductivity of not less than 102% IACS, ensuring extremely high current transmission efficiency. There are multiple copper wires 3, and each copper wire 3 is fitted with a shielding tube 23 on its outer wall. The shielding tube 23 is made of mica tape. This design can not only effectively and uniformly distribute the electric field on the conductor surface and prevent partial discharge, but also form an insulation barrier at high temperature to maintain the structural integrity and current carrying function of the conductor. To prevent damage to the shielding tube 23 made of mica tape, an inner filling layer 22 is sleeved on the outside of the shielding tube 23. The inner filling layer 22 is a wrapped graphene-based high-strength conductive cloth (volume resistivity can be less than 1×10⁻⁶). 3 (Ω·cm), with an outer layer of extruded graphene composite semiconductive shielding material; The insulating shielding layer 21 is also made of graphene composite high semiconducting shielding material, with a volume resistivity of no more than 20 Ω·cm. The introduction of graphene significantly improves the conductivity and thermal stability of the shielding layer, making the contact between the insulating shielding layer 21 and the inner filling layer 22 smoother and tighter, greatly improving the electric field distribution and suppressing partial discharge phenomena. In the actual manufacturing process, the extruded graphene composite semiconductive shielding material, the insulating shielding layer 21 and the inner filling layer 22 are formed in one step using a three-layer co-extrusion technology to ensure that there are no gaps or defects between the layers, effectively eliminating micro-gaps and protrusions at the interface, so that the copper wire 3 can achieve high conductivity, thereby enabling the cable to complete the effect of ultra-high voltage power transmission. In order to enable the copper wire 3 to work normally, and to provide good protection for the insulation shielding layer 21, the inner filling layer 22, and the extruded graphene composite semiconductive shielding material, the cable conduit 2 uses cross-linked polyethylene (XLPE) as the main insulation material. Cross-linked polyethylene has excellent electrical insulation properties, heat resistance (long-term allowable working temperature can reach 90℃) and mechanical strength, making it an ideal choice for ultra-high voltage cable insulation.

[0042] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the preferred embodiments, while those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0043] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-conductivity, flame-retardant, ultra-high voltage cable, characterized in that, include: The wire harness structure and the protective structure sleeved outside the wire harness structure, both ends of the protective structure are detachably connected to a tightening sleeve; The protective structure includes an outer sheath, a spiral protective layer, and an inner protective layer; The inner protective layer is fixed to the inner wall of the outer sheath, and the inner protective layer is also sleeved on the wire harness structure. The spiral protective layer is a threaded strip structure fixed to the outer wall of the outer sheath and is used to protect the outer sheath. The tightening sleeve includes a compression shell, a compression piece, and an abutment block; The extrusion plates are fixed at equal intervals at one end of the extrusion shell, and the abutment block is fixed on the inner wall of the extrusion plate at the end away from the extrusion shell. When the extrusion shell is disassembled and connected to the end of the outer sheath, the extrusion plates drive the abutment block to press the end of the outer sheath, so that the outer sheath drives the inner sheath to tightly wrap around the wire harness structure. The protective structure has a support bar inside, and the wire harness structure has multiple support bars distributed around the support bar. The support bar is elastic. When the tightening sleeve moves the end of the protective structure to fit the wire harness structure, the support bar is squeezed by the tightening sleeve. The support bar supports the wire harness structure with its own restoring force, thereby making the wire harness structure firmly connected in the protective structure.

2. The high-conductivity, flame-retardant, ultra-high voltage cable according to claim 1, characterized in that, The inner protective layer includes an armor layer, an inner sheath, and an outer filler layer; The outer filling layer is distributed in multiple layers around the support strip, and the multiple outer filling layers form a tubular structure. The tubular structure formed by the multiple outer filling layers wraps around the wire harness structure. The inner sheath is fitted on the outer wall of the tubular structure formed by the multiple outer filling layers. The armor layer is fitted on the outer wall of the inner sheath. The outer sheath is fitted on the outer wall of the armor layer.

3. The high-conductivity, flame-retardant ultra-high voltage cable according to claim 2, characterized in that, The extrusion sheet is integrally fixed with the extrusion shell, and the part where the extrusion sheet and the extrusion shell are connected is provided with rounded corners. A notch is provided between every two extrusion sheets.

4. The high-conductivity, flame-retardant ultra-high voltage cable according to claim 3, characterized in that, The abutment block has rounded corners near the spiral protective layer. The abutment block is integrally fixed to the inner wall of the extrusion sheet. The abutment block is in contact with the outer sheath and the spiral protective layer.

5. The high-conductivity, flame-retardant ultra-high voltage cable according to claim 4, characterized in that, The inner wall of the extrusion shell is provided with internal threads, which are engaged with the spiral protective layer threads. The extrusion shell is a circular tube structure.

6. The high-conductivity, flame-retardant ultra-high voltage cable according to claim 5, characterized in that, A sealing ring is fixed to the inner wall of the extrusion shell at the end opposite to the extrusion sheet. The sealing ring is elastic and contacts the outer sheath and the spiral protective layer. A connecting ring is fixed to the outer wall of the extrusion shell at the end opposite to the extrusion sheet.

7. The high-conductivity, flame-retardant ultra-high voltage cable according to claim 6, characterized in that, The wire harness structure includes copper wires, a shielding tube, and a support component; The copper wires are distributed in multiple ways, and each copper wire has a shielding tube sleeved on its outer wall. The shielding tubes are inserted into the support in a dot matrix pattern.

8. The high-conductivity, flame-retardant ultra-high voltage cable according to claim 7, characterized in that, The support component includes a cable conduit, an insulating shielding layer, and an inner filling layer; An insulating shielding layer is fitted onto the outer wall of the inner filling layer, and a cable conduit is fitted onto the outer wall of the insulating shielding layer. The shielding conduit is inserted into the inner wall of the inner filling layer.

9. The high-conductivity, flame-retardant ultra-high voltage cable according to claim 8, characterized in that, The outer wall of the cable conduit is rough, and the side of the support strip that contacts the cable conduit has a groove, in which the cable conduit is embedded.

10. The high-conductivity, flame-retardant ultra-high voltage cable according to claim 9, characterized in that, The support strips and cable conduits are both distributed inside the outer filling layer. The support strips are used to support the cable conduits. The side of the outer filling layer that contacts the cable conduits is also rough. The outer filling layer is elastic.

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