Aging and high temperature resistant high voltage cable

Abstract

This invention discloses an aging-resistant and high-temperature-resistant high-voltage cable, relating to the field of cable technology. It includes a core cable and further comprises: an anchor-type support structure, three sets of which are combined to form a cable body support, with a first slot between the cable body supports, and the core cable inserted into the first slot; an outer protective layer fitted over the outside of the cable body support; the anchor-type support structure includes a heat insulation strip, on which an anchor-support arc-shaped main body is fixedly installed, and a ventilation cavity is provided within the anchor-support arc-shaped main body; this invention, by setting a dual-cavity structure of ventilation cavity and heat insulation cavity, combined with a first support heat-conducting bracket and a second support heat-conducting bracket to form an internal and external dual-heat source response mechanism, breaks through the limitations of the existing single passive heat dissipation technology, achieving passive adaptive regulation of the core cable's own heating and external ambient temperature. At high temperatures, it actively expands the ventilation cavity to enhance heat dissipation; at low temperatures, it actively expands the heat insulation cavity to enhance insulation, thus addressing both heat dissipation and insulation needs.

Description

Technical Field

[0001] This invention belongs to the field of cable technology, specifically, it relates to a high-voltage cable that is resistant to aging and high temperature. Background Technology

[0002] High-voltage cables operate under high loads for extended periods. The core conductors continuously generate a large amount of heat during operation and must withstand the influence of complex environmental factors such as alternating high and low temperatures, ultraviolet radiation, water vapor erosion, and mechanical compression. Therefore, extremely high requirements are placed on the cable's aging resistance, high-temperature resistance, and operational stability.

[0003] A search revealed that patent document CN119092205B, published on 2025-05-02, discloses a thermally stable medium- and high-voltage cable suitable for high-temperature and high-temperature scenarios. The cable includes a first rib on the outside of the inner sheath and a second rib on the inside of the outer sheath. The recessed areas of the wavy structure of the insulation layer alternately accommodate the ends of the first and second ribs, with the bottoms of the recessed areas fitting against the ends of the first and second ribs respectively. This forms an inner heat dissipation cavity between the inner sheath and the insulation layer, and an outer heat dissipation cavity between the outer sheath and the insulation layer. This significantly increases the cable's heat dissipation surface area, improving overall heat dissipation performance. The wavy structure of the insulation layer further increases the heat dissipation surface area, facilitating rapid heat conduction and dissipation within the heat dissipation cavity, reducing the internal temperature of the cable, slowing down the thermal aging of the material, extending the cable's service life, effectively preventing overheating, reducing fire risk, and enhancing the cable's operational safety.

[0004] While the aforementioned patent documents can improve heat dissipation performance through a corrugated insulation layer and dual heat dissipation cavities, solving some of the problems of insufficient heat dissipation in traditional cables, they still have significant limitations: First, the temperature control method is singular, only achieving passive heat dissipation, unable to adaptively adjust according to the core cable's own heating status and changes in external ambient temperature. It can only improve heat dissipation efficiency by fixing the heat dissipation cavity and the corrugated structure, lacking the ability to actively adapt to different operating conditions; Second, it lacks a precise core cable positioning structure and does not have a dedicated centering positioning component, which easily leads to problems such as core cable misalignment and uneven insulation distance, affecting the safety of high-voltage operation; Third, it does not achieve bidirectional adaptation of heat dissipation and insulation, focusing only on high-temperature heat dissipation and failing to take into account the insulation requirements in low-temperature environments, thus limiting its applicability. In view of the above problems, an aging-resistant and high-temperature-resistant high-voltage cable is proposed here. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a high-voltage cable that is resistant to aging and high temperature, which can overcome or at least partially solve the above problems.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0007] A high-voltage cable resistant to aging and high temperature includes a core cable and further includes: an anchor-type support structure, three sets of which are combined to form a cable body support, with a first slot between the cable body supports, and the core cable inserted into the first slot; an outer protective layer sleeved on the outside of the cable body support; the anchor-type support structure includes a heat insulation strip, on which an anchor-support arc-shaped body is fixedly installed, and a ventilation cavity is provided inside the anchor-support arc-shaped body; a heat insulation cavity is provided between the heat insulation strip and the anchor-support arc-shaped body, and the heat insulation cavity is filled with inert gas, which, together with the heat insulation strip and a second heat-conducting support, forms a low-temperature heat insulation barrier; a first heat-conducting support is disposed in the ventilation cavity, which absorbs the heat generated when the core cable is working and deforms to adjust the space ratio between the ventilation cavity and the heat insulation cavity; a second heat-conducting support is disposed in the heat insulation cavity, which absorbs the heat from the external environment and deforms to adjust the space ratio between the ventilation cavity and the heat insulation cavity.

[0008] Preferably, when the heat generated by the core cable exceeds the core cable's operating threshold, the space of the ventilation cavity driven by the first supporting heat-conducting bracket increases, and the space of the insulation cavity decreases; when the heat conducted from the external environment to the second supporting heat-conducting bracket is lower than the core cable's normal operating temperature threshold, the space of the insulation cavity driven by the second supporting heat-conducting bracket increases, and the space of the ventilation cavity decreases; when the heat conducted from the external environment to the second supporting heat-conducting bracket is higher than the highest ambient temperature threshold required for the core cable's operation, the space of the insulation cavity driven by the second supporting heat-conducting bracket decreases.

[0009] Preferably, the anchor-type support structure is a straight extruded structure extending along the cable axis, and the three sets of the anchor-type support structures are evenly distributed along the circumference of the core cable and spliced ​​together.

[0010] Preferably, when the anchor support structure is a spiral structure, the three sets of spiral anchor support structures are spirally wound along the cable axis.

[0011] Preferably, the first heat-conducting support bracket includes a deformable metal ring, a first connecting rod fixedly mounted on the deformable metal ring, a first heat-conducting support head fixedly mounted on the first connecting rod, and the first heat-conducting support head inserted into a gap in the ventilation cavity facing the center of the high-voltage cable; a second connecting rod fixedly mounted on the deformable metal ring, a second heat-conducting support head fixedly mounted on the second connecting rod, and the second heat-conducting support head inserted into a gap in the ventilation cavity near the heat insulation cavity.

[0012] Preferably, the first heat-conducting support head is a pentagonal hollow structure, the outer contour of which is formed by the sequential connection of a V-shaped second connector at the top, a first arc-shaped side that narrows inward on both sides, and a V-shaped first connector at the bottom. The first connector is fixedly connected to the first connecting rod. The edges of the pentagonal hollow structure are rounded, and its outer wall is in multi-faceted contact with the inner wall of the anchor support arc-shaped body to absorb the heat generated by the core cable and transfer it to the deformable metal ring. When the heat generated by the core cable causes the deformable metal ring to expand, the expansion and deformation of the deformable metal ring drives the first connecting rod to move. The first connecting rod drives the first connector to unfold, and the transmission of the first arc-shaped side drives the second connector to expand outward, so that the overall radial dimension of the first heat-conducting support head increases and presses against the anchor support arc-shaped body.

[0013] Preferably, the second heat-conducting support head is a long, hollow airfoil structure with a streamlined outer contour that is wider in the middle and narrower at both ends. It includes a V-shaped third connector fixedly connected to the second connecting rod, second arc-shaped edges connected to both ends of the third connector, and a third arc-shaped edge at the end. The edges of the hollow airfoil structure are rounded, and the outer wall is in multi-faceted contact with the inner wall of the anchor support arc-shaped body. When the heat generated by the core cable causes the deformable metal ring to expand, the expansion and deformation of the deformable metal ring drives the second connecting rod to move. The second connecting rod drives the third connector to unfold, and through the transmission of the second arc-shaped edge, it drives the third arc-shaped edge to expand outward. This drives the second heat-conducting support head to extend along the streamlined contour and closely adhere to the inner wall of the anchor support arc-shaped body. At the same time, it drives the cavity walls of the ventilation cavity and the heat insulation cavity to move towards the heat insulation cavity, thereby compressing the space of the heat insulation cavity and expanding the heat dissipation channel of the ventilation cavity.

[0014] Preferably, the core cable includes a main conductor, the outer circumferential surface of which is tightly covered with a main insulation layer, and a cross-linked polyethylene layer and an outer sheath insulation layer are sequentially and coaxially disposed on the outer side of the main insulation layer, and the outer wall of the outer sheath insulation layer is in contact with the inner wall of the arc-shaped body of the anchor support.

[0015] Preferably, the outer protective layer includes an inner lining layer, an armor layer, and an outer sheath layer arranged sequentially from the inside to the outside; the inner lining layer covers the outside of the cable support, the armor layer is formed by spirally winding multiple galvanized steel wires around the outer surface of the inner lining layer, and the outer sheath layer is made of aging-resistant and flame-retardant polyolefin material extruded onto the outer surface of the armor layer.

[0016] Preferably, the device further includes a connector, both ends of which are provided with a second slot for engaging with the outer protective layer. The connector is provided with a wire hole connecting the two sets of second slots. The connector is provided with a first diversion cavity and a second diversion cavity. A first connecting pipe communicating with the first diversion cavity and a second connecting pipe communicating with the second diversion cavity are fixedly installed on the side wall of the connector. The first diversion cavity and the second diversion cavity are respectively connected to the ventilation cavities in the anchor-type support structures on both sides.

[0017] Beneficial effects:

[0018] 1. This invention uses three sets of anchor-type support structures evenly arranged circumferentially, combined with the first slot to achieve precise centered positioning of the core cable, effectively avoiding electric field distortion and partial discharge problems caused by core cable offset and uneven insulation distance, and significantly improving the electrical safety of high-voltage cable operation.

[0019] 2. This invention, by setting up a dual-cavity structure of ventilation cavity and heat insulation cavity, and combining it with the first and second supporting heat-conducting brackets to form an internal and external dual heat source response mechanism, breaks through the limitation of the single passive heat dissipation of the existing technology, and realizes the passive adaptive regulation of the core cable's own heating and the external ambient temperature. At high temperatures, it actively expands the ventilation cavity to enhance heat dissipation, and at low temperatures, it actively expands the heat insulation cavity to enhance heat preservation, taking into account both heat dissipation and heat preservation needs.

[0020] 3. The anchor-type support structure in this invention can adopt two layouts: a straight line or a spiral. The straight line is easy to extrude and form in one piece, reducing production costs, while the spiral can form a spiral flow channel, improving heat dissipation efficiency and mechanical strength, and is suitable for different laying scenarios.

[0021] 4. The core cable of this invention adopts a multi-layer coaxial composite insulation structure. The outer protective layer is composed of an inner lining layer, an armor layer, and an outer sheath layer. Matching joints realize sealed connection and cooling medium access, forming a composite heat dissipation mode that combines passive heat dissipation and active air cooling, further improving the cable's aging resistance, high temperature resistance, and mechanical protection capabilities.

[0022] 5. This invention eliminates the need for sensors and electronic control drive components, relying on the material's own temperature deformation characteristics to achieve passive intelligent control. It features a simple structure, reliable operation, and strong environmental adaptability, effectively solving the technical pain points of traditional high-voltage cables and existing related patents, significantly extending cable service life, and reducing operational safety hazards.

[0023] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0024] In the attached diagram:

[0025] Figure 1 This is a three-dimensional structural diagram of a high-voltage cable that is resistant to aging and high temperature, as proposed in this invention.

[0026] Figure 2 This is a schematic diagram of the end face structure of an anchor-type support structure for a high-voltage cable that is resistant to aging and high temperatures, as proposed in this invention.

[0027] Figure 3 This is a main cross-sectional view of a high-voltage cable that is resistant to aging and high temperatures, as proposed in this invention.

[0028] Figure 4 This is a three-dimensional structural diagram of a connector for a high-voltage cable that is resistant to aging and high temperatures, as proposed in this invention.

[0029] Figure 5 This is a cross-sectional view of a connector for a high-voltage cable that is resistant to aging and high temperatures, as proposed in this invention.

[0030] Figure 6 This is a schematic diagram of the structure of the arc-shaped main body for the anchor support of a high-voltage cable that is resistant to aging and high temperature, as proposed in this invention.

[0031] Figure 7 This is a three-dimensional structural diagram of an anchor-type support structure for a high-voltage cable that is resistant to aging and high temperatures, as proposed in this invention.

[0032] Figure 8 This is a main sectional view of an anchor-type support structure for an aging-resistant and high-temperature-resistant high-voltage cable proposed in this invention.

[0033] Figure 9 This is a three-dimensional structural diagram of the first support heat-conducting bracket for an aging-resistant and high-temperature-resistant high-voltage cable proposed in this invention.

[0034] Figure 10 This is a front view of the first support heat-conducting bracket for a high-voltage cable that is resistant to aging and high temperature, as proposed in this invention.

[0035] Figure 11 This is a main cross-sectional view of the core cable of a high-voltage cable that is resistant to aging and high temperature, as proposed in this invention.

[0036] In the diagram: 1. Anchor-type support structure; 11. Thermal insulation strip; 12. Anchor support arc-shaped main body; 121. Ventilation cavity; 13. Thermal insulation cavity; 14. First support heat-conducting bracket; 141. Deformed metal ring; 142. First connecting rod; 143. First heat-conducting support head; 144. Second connecting rod; 145. Second heat-conducting support head; 15. Slot; 2. Core cable; 21. Main conductor core; 22. Main conductor core insulation layer; 23. Cross-linked polyethylene layer; 24. Sealed heat-conducting outer jacket; 3. Armor layer; 4. Woven mesh layer; 5. Ceramic rubber sealing layer; 6. Joint; 61. First slot; 62. Second slot; 63. First diversion cavity; 631. First connecting pipe; 64. Second diversion cavity; 641. Second connecting pipe; 7. Second support heat-conducting bracket. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] Example 1: Refer to Figures 1-11 A high-voltage cable resistant to aging and high temperature includes a core cable 2 (the core cable 2 is a single independent insulated core unit, and the entire high-voltage cable contains three such independent insulated core units, i.e., three core cables 2), and also includes: an anchor-type support structure 1, three sets of anchor-type support structures 1 combined to form a cable body bracket, three first slots 15 are provided between the three cable body brackets, and the three core cables 2 are respectively inserted into the three first slots 15; an outer protective layer, sleeved on the outside of the cable body bracket; the anchor-type support structure 1 includes a heat insulation strip 11, an anchor-support arc-shaped body 12 is fixedly installed on the heat insulation strip 11, a ventilation cavity 121 is provided inside the anchor-support arc-shaped body 12, a heat insulation cavity 13 is provided between the heat insulation strip 11 and the anchor-support arc-shaped body 12, and the heat insulation cavity 13 is filled with an inert gas (preferably nitrogen), and is connected to the heat insulation strip 11 and the second support heat-conducting bracket 7. The two structures work together to form a low-temperature thermal insulation barrier. A first thermally conductive support 14, located within the ventilation cavity 121, absorbs the heat generated by the core cable 2 during operation, resulting in a small, controllable deformation (the deformation range is limited to a range that does not compress the insulation layer of the core cable 2 or disrupt the uniformity of the internal electric field), adjusting the space ratio between the ventilation cavity 121 and the thermal insulation cavity 13. A second thermally conductive support 7, located within the thermal insulation cavity 13, absorbs heat from the external environment, resulting in a small, controllable deformation, which in turn adjusts the space ratio between the ventilation cavity 121 and the thermal insulation cavity 13. The first and second thermally conductive supports 14 and 7 only deform to adjust when the core cable 2 is under load and generating heat. When the core cable 2 is unloaded, unpowered, and generates no heat, both supports maintain their initial shape and do not perform any active adjustment.

[0039] In this embodiment, three sets of anchor-type support structures 1 are evenly distributed around the circumference of the three core cables 2. Each core cable 2 is positioned by the first slot 15 to ensure that each core cable 2 remains centered, thus maintaining a stable insulation distance. The anchor-support arc-shaped body 12 and the heat insulation strip 11 together define the ventilation cavity 121 and the heat insulation cavity 13. The inert gas filled in the heat insulation cavity 13 works in conjunction with the heat insulation strip 11 to form a heat insulation barrier, providing a basis for low-temperature insulation. The first support heat-conducting bracket 14 directly receives the heat conducted by the core cable 2, and the second support heat-conducting bracket 7 receives the heat conducted by the external environment. The two support heat-conducting brackets deform according to different heat sources, adjusting the space ratio of the two chambers in opposite directions. Specifically:

[0040] When the heat generated by the core cable 2 exceeds the working threshold of the core cable 2, the first supporting heat-conducting bracket 14 drives the space of the ventilation cavity 121 to increase and the space of the heat insulation cavity 13 to decrease.

[0041] When the heat conducted from the external environment to the second support heat-conducting bracket 7 is lower than the normal operating temperature threshold of the core cable 2, the second support heat-conducting bracket 7 drives the space of the heat insulation cavity 13 to increase and the space of the ventilation cavity 121 to decrease. At this time, the core cable 2 is in a loaded working state and heat is generated. The deformation driving force of the second support heat-conducting bracket 7 comes from the temperature difference between the external low temperature and the working heat of the core cable 2.

[0042] When the heat conducted from the external environment to the second support heat-conducting bracket 7 is higher than the highest ambient temperature threshold required for the core cable 2 to operate, the space of the second support heat-conducting bracket 7 drives the heat insulation cavity 13 to decrease.

[0043] The long-term operating temperature of the main conductor 21 of the core cable 2 is 70-90℃, and the short-circuit temperature does not exceed 250℃. The normal operating temperature threshold of the external environment is -40℃ to 70℃. Within this range, the first supporting heat-conducting bracket 14 and the second supporting heat-conducting bracket 7 can achieve bidirectional adaptive adjustment. The three operating conditions are independent of each other, and the driving components have clear division of labor. The overheating heat dissipation of the core cable 2 has adjustment priority, that is, the force generated by the heat absorption deformation of the first supporting heat-conducting bracket 14 is greater than the force generated by the heat absorption deformation of the second supporting heat-conducting bracket 7.

[0044] In this embodiment, the core cable 2 is centered and positioned using three sets of circumferentially evenly arranged anchor-type support structures 1, ensuring the core cable 2 remains stable within the cable and that the insulation distance is uniform. This effectively avoids electric field distortion and partial discharge, improving electrical safety under high-voltage operating conditions. The ventilation cavity 121 and the heat insulation cavity 13 are independently configured, respectively handling heat dissipation and insulation functions, ensuring that the heat dissipation channel and the insulation cavity do not interfere with each other, and can simultaneously adapt to both high-temperature heat dissipation and low-temperature insulation conditions. The first support heat-conducting bracket 14 and the second support heat-conducting bracket 7 respond to the core cable 2's own heat generation and the external ambient temperature, respectively, achieving passive adaptive adjustment driven by the core cable 2's working heat (requiring no additional electrical control, sensors, or drive components; the driving force comes from the core cable 2's own working heat). It features a simple structure, reliable operation, and strong stability. When the core cable 2 heats up beyond the threshold, it automatically expands the ventilation cavity 121 and compresses the insulation cavity 13 to rapidly enhance the internal airflow heat dissipation capacity, reduce the temperature of the core cable 2 and the insulation layer, and delay the thermal aging of the insulation layer. When the external ambient temperature is too low, it automatically expands the insulation cavity 13 and reduces the ventilation cavity 121, relying on inert gas and the insulation strip 11 to form a highly efficient heat insulation layer, maintaining the working temperature of the core cable 2 and preventing the insulation layer from becoming brittle and cracking at low temperatures. When the external ambient temperature is too high, it automatically reduces the insulation cavity 13 to reduce the transfer of external heat to the inside, and works with the internal ventilation cavity 121 to dissipate heat, achieving dual protection of external heat insulation and internal heat dissipation, significantly improving the cable's aging resistance and service life in complex environments such as alternating high and low temperatures, high temperatures, and low temperatures.

[0045] In summary, this cable utilizes the dual response of the core cable 2's own heat generation and the external ambient temperature to actively expand the heat dissipation channel at high temperatures and actively enhance the heat preservation capacity at low temperatures. This solves the problem that traditional cables can only passively dissipate heat and cannot handle both high and low temperature conditions, significantly improving the cable's working stability and service life in extreme environments.

[0046] Reference Figure 3 and Figure 6 The anchor-type support structure 1 is constructed as a straight extruded structure extending along the cable axis. The three sets of anchor-type support structures 1 are evenly distributed along the circumference of the core cable 2 and spliced ​​together.

[0047] This embodiment adopts a straight anchor-type support structure 1, which has no twist along the cable axis and is easy to integrally form through extrusion process. The three sets of support structures are evenly distributed along the circumference and spliced ​​together to form a stable triangular support frame, which together support the cable body and the outer protective layer.

[0048] The linear structure simplifies the production process, eliminating the need for complex spiral molds, and is compatible with traditional extrusion production lines, reducing manufacturing costs and process difficulty. The evenly distributed triangular support structure provides balanced stress, effectively preventing cable deformation under pressure, while ensuring the unobstructed flow of the ventilation cavity 121 along the axial direction, facilitating the circulation of cooling medium.

[0049] Reference Figure 2 , Figure 3 and Figures 8-10 The first heat-conducting support bracket 14 includes a deformable metal ring 141 (made of shape memory alloy, with a phase change threshold matching the normal operating temperature of the core cable 2, preferably 60°C). A first connecting rod 142 is fixedly installed on the deformable metal ring 141, and a first heat-conducting support head 143 is fixedly installed on the first connecting rod 142. The first heat-conducting support head 143 is inserted into a gap in the ventilation cavity 121 facing the center of the high-voltage cable. A second connecting rod 144 is fixedly installed on the deformable metal ring 141, and a second heat-conducting support head 145 is fixedly installed on the second connecting rod 144. The second heat-conducting support head 145 is inserted into a gap in the ventilation cavity 121 near the heat insulation cavity 13. The first heat-conducting support head 143 is pentagonal. The pentagonal hollow structure is formed by the sequential connection of a V-shaped second connector 1433 at the top, first arc-shaped edges 1432 that narrow inward on both sides, and a V-shaped first connector 1431 at the bottom. The first connector 1431 is fixedly connected to the first connecting rod 142. The edges of the pentagonal hollow structure are rounded, and its outer wall is in multi-faceted contact with the inner wall of the anchor support arc-shaped body 12 to absorb the heat generated by the core cable 2 and transfer it to the deformable metal ring 141. When the heat generated by the core cable 2 causes the deformable metal ring 141 to expand, the expansion and deformation of the deformable metal ring 141 drives the first connecting rod 142 to move, and the first connecting rod 142 drives the first connector 1431 to extend. The first arc-shaped edge 1432 drives the second connecting piece 1433 to expand outward, increasing the overall radial dimension of the first thermally conductive support head 143 and pressing it against the anchor support arc-shaped body 12. This pressing is a flexible fit without rigid compression, allowing for controllable deformation without compressing the insulation layer of the core cable 2 or disrupting the internal electric field uniformity. The second thermally conductive support head 145 is a long, hollow airfoil structure with a streamlined outer contour that is wider in the middle and narrower at both ends. It includes a V-shaped third connecting piece 1451 fixedly connected to the second connecting rod 144, second arc-shaped edges 1452 connected to both ends of the third connecting piece 1451, and a third arc-shaped edge 1453 located at the end. The hollow airfoil structure's edges... The edge adopts a rounded transition, and the outer wall is in multi-faceted contact with the inner wall of the anchor support arc-shaped body 12. When the heat generated by the core cable 2 causes the deformable metal ring 141 to expand due to heat, the expansion and deformation of the deformable metal ring 141 drives the second connecting rod 144 to move. The second connecting rod 144 drives the third connecting piece 1451 to unfold. Through the transmission of the second arc-shaped edge 1452, the third arc-shaped edge 1453 is driven to expand outward, driving the second heat-conducting support head 145 to extend along the streamlined contour and closely adhere to the inner wall of the anchor support arc-shaped body 12. At the same time, it drives the cavity walls of the ventilation cavity 121 and the heat insulation cavity 13 to move towards the heat insulation cavity 13, so as to compress the space of the heat insulation cavity 13 and expand the heat dissipation channel of the ventilation cavity 121.

[0050] When the core cable 2 heats up under load and reaches the phase change threshold of the deformable metal ring 141, the deformable metal ring 141 expands and deforms due to heat. This deformation is a slight, controllable thermal expansion without violent expansion, which synchronously drives the first connecting rod 142 and the second connecting rod 144 to move synchronously. The first connecting rod 142 drives the first connecting piece 1431 to unfold outward, and the force transmitted through the first arc-shaped edge 1432 drives the second connecting piece 1433 to expand outward synchronously, so that the overall radial dimension of the first thermally conductive support head 143 increases and it closely abuts against the inner wall of the anchor support arc-shaped body 12. At the same time, the second connecting rod 144 drives the third connecting piece 1451 to unfold, and the force transmitted through the second arc-shaped edge 1452... The drive causes the third arc-shaped edge 1453 to extend outward, causing the second heat-conducting support head 145 to open along its own streamlined contour and fit against the inner wall of the arc-shaped anchor support body 12. Simultaneously, it pushes the cavity walls of the ventilation cavity 121 and the heat insulation cavity 13 to shift gently towards the heat insulation cavity 13, thereby reducing the volume of the heat insulation cavity 13 and expanding the heat dissipation channel of the ventilation cavity 121. At the same time, it flexibly compresses the arc-shaped second support heat-conducting bracket 7. When the temperature of the core cable 2 drops, the deformed metal ring 141 cools, shrinks, and resets, causing all connectors and heat-conducting support heads to return to their original positions. At the same time, the reset of the second support heat-conducting bracket 7 restores the spatial ratio of the ventilation cavity 121 and the heat insulation cavity 13 to its initial state.

[0051] In this embodiment, the deformable metal ring 141 and the first thermally conductive support head 143 cooperate to construct a linkage link of temperature sensing, thermal conduction, and lever deformation amplification. While achieving efficient heat transfer, it amplifies weak deformation into overall structural displacement, and also serves to assist in the centering and positioning of the core cable 2 and stabilize the insulation distance. The deformable metal ring 141 and the second thermally conductive support head 145 work together to transform the material properties of thermal expansion and contraction into the extension of the support head contour and the directional pushing action of the cavity wall. This automatically adjusts the volume ratio of the heat insulation cavity 13 and the ventilation cavity 121. At the same time, it relies on the airfoil streamline structure to disturb the airflow in the cavity and enhance turbulent heat dissipation, achieving multiple gains such as passive drive driven by the working heat of the core cable 2, cavity adjustment, and heat dissipation enhancement. The first thermally conductive support head 143 and the second thermally conductive support head 145 cooperate and deform synchronously in the ventilation cavity 121, taking into account both the centering and positioning of the core cable 2 and the expansion and optimization of the ventilation channel. Electrical safety, heat dissipation performance, and structural stability are mutually reinforced. The first support heat-conducting bracket 14 and the second support heat-conducting bracket 7 form an internal and external dual heat source response mechanism, which can simultaneously sense the heating of the core cable 2 itself and the changes in the external ambient temperature. This enables adaptive regulation under all working conditions, including enhanced heat dissipation at high temperatures, heat insulation at low temperatures, and blocking heat intrusion from external high temperatures. The regulation coverage and protection effect are far superior to those of a single bracket working independently. The anchor-supported arc-shaped main body 12, ventilation cavity 121, and heat insulation cavity 13 rely on each other. They not only rely on the support structure to form a stable cavity layout, but also achieve dynamic adjustment of the dual cavity space ratio through deformable brackets, breaking through the limitation of traditional cables that can only provide passive and static protection. The pentagonal hollow structure and the hollow airfoil streamline structure are set together with the edge arc transition design, while taking into account multi-faceted heat conduction, stress concentration avoidance, lever force transmission, and airflow turbulence optimization. The structural mechanical performance and fluid heat dissipation performance are synergistically improved.

[0052] In this embodiment, when the heat generated by the core cable 2 exceeds the normal operating temperature threshold, the core cable 2 generates excess heat under load. The heat is conducted through the outer insulation layer 24 and the anchor support arc-shaped body 12 to the first heat-conducting support head 143. After absorbing heat, the first heat-conducting support head 143 transfers the temperature to the deformable metal ring 141. The deformable metal ring 141 reaches the phase change temperature and undergoes thermal expansion deformation. The deformation synchronously drives the first connecting rod 142 and the second connecting rod 144 to move in linkage, causing the first heat-conducting support head 143 to expand radially outward and press against the inner wall of the anchor support arc-shaped body 12 (flexible fit). At the same time, it drives the second heat-conducting support head 145 to extend along the streamlined contour and push the cavity wall to gently shift towards the heat insulation cavity 13. The space of the ventilation cavity 121 is passively increased, while the space of the heat insulation cavity 13 is compressed and reduced. The airflow channel inside the ventilation cavity 121 is widened, the convection heat dissipation capacity is enhanced, and the excess heat of the core cable 2 is quickly carried away, achieving high-temperature self-heating and cooling.

[0053] When the external ambient temperature is lower than the normal operating temperature threshold of the core cable 2, the core cable 2 is in a loaded working state. The low external temperature is conducted to the interior of the insulation cavity 13 through the outer protective layer, inner lining layer 3, and heat insulation strip 11, and acts on the second support heat-conducting bracket 7. The second support heat-conducting bracket 7 undergoes elastic stretching and restoring deformation under the action of low temperature, pushing the middle cavity wall towards the ventilation cavity 121. The cavity wall undergoes a reverse gentle displacement, the space of the insulation cavity 13 is expanded and enlarged, and the space of the ventilation cavity 121 is correspondingly reduced. The thickness of the inert gas insulation layer inside the insulation cavity 13 increases, forming a closed and efficient heat insulation barrier, reducing the heat loss of the core cable 2 itself, maintaining the stable operating temperature of the core cable 2, and avoiding low-temperature embrittlement of the insulation layer.

[0054] When the external ambient temperature is higher than the maximum withstand temperature threshold of the core cable 2, the external high temperature penetrates into the heat insulation cavity 13 through the outer structure and acts on the second support heat-conducting bracket 7; the second support heat-conducting bracket 7 is compressed and deformed by the high temperature, and retracts away from the ventilation cavity 121; the cavity wall moves synchronously and smoothly with the second support heat-conducting bracket 7, the overall space of the heat insulation cavity 13 is compressed and reduced, the heat insulation path of the external high temperature to the inside of the cable is shortened and the amount of heat intrusion is reduced; at the same time, in conjunction with the inherent heat dissipation capacity of the ventilation cavity 121, a dual protection of external heat resistance and internal heat dissipation is formed, avoiding the external high temperature baking that accelerates the aging of the insulation layer.

[0055] Reference Figure 3 and Figure 9 The core cable 2 includes a main conductor 21. The outer periphery of the main conductor 21 is tightly covered with a main insulation layer 22. A cross-linked polyethylene layer 23 and an outer sheath insulation layer 24 are sequentially and coaxially arranged on the outside of the main insulation layer 22. The outer wall of the outer sheath insulation layer 24 is in contact with the inner wall of the anchor support arc-shaped body 12.

[0056] In this embodiment, the main conductor 21 serves as the carrier of electrical energy transmission. During operation, the heat generated is transferred from the inside to the outside in sequence to the main conductor insulation layer 22, the cross-linked polyethylene layer 23, and the outer sheath insulation layer 24. The outer wall of the outer sheath insulation layer 24 is directly attached to the inner wall of the anchor support arc-shaped body 12, which can quickly and evenly conduct the heat generated by the core cable 2 to the anchor support arc-shaped body 12, and then from the anchor support arc-shaped body 12 to the first heat-conducting support head 143 in the ventilation cavity 121, providing a stable heat conduction path for the temperature-sensing deformation of the deformable metal ring 141 and adaptive adjustment of the cavity space. The multi-layer structure is coaxially and tightly wrapped to ensure the overall roundness of the core cable 2, so that the core cable 2 can be stably installed in the first slot 15 and always maintain a centered positioning state.

[0057] In this embodiment, the main core insulation layer 22, the cross-linked polyethylene layer 23, and the outer sheath insulation layer 24 form a composite insulation protection system, which isolates the high voltage electric field layer by layer, effectively improves the electrical insulation performance, delays the thermal and oxidative aging of the insulation material, and enhances the high temperature resistance and aging resistance of the core cable 2.

[0058] The outer insulation layer 24 is directly attached to the inner wall of the arc-shaped body 12 of the anchor support, forming a continuous heat conduction path. This allows the working heat of the main conductor 21 to be promptly discharged to the support structure and ventilation cavity 121, preventing heat from accumulating inside the core cable 2 and causing local overheating.

[0059] The coaxial nesting of each layer ensures the regular shape of the core cable 2. Combined with the clamping and limiting of the three sets of anchor-type support structures 1, the core cable 2 is always kept in the center, with uniform and stable insulation distance, effectively avoiding electric field distortion and partial discharge hazards, and improving the safety of high-voltage operation.

[0060] The cross-linked polyethylene layer 23 itself has excellent heat resistance, aging resistance and mechanical flexibility, which can improve the core cable 2's resistance to deformation and high and low temperature alternation, and extend the overall service life of the cable.

[0061] Reference Figure 3 The outer protective layer includes an inner lining layer 3, an armor layer 4, and an outer sheath layer 5 arranged sequentially from the inside to the outside. The inner lining layer 3 covers the outside of the cable body support. The armor layer 4 is formed by spirally winding multiple galvanized steel wires around the outer surface of the inner lining layer 3. The outer sheath layer 5 is made of aging-resistant and flame-retardant polyolefin material extruded and molded on the outer surface of the armor layer 4.

[0062] In this embodiment, the inner lining layer 3 tightly covers the outside of the cable support, serving as a smooth transition and buffer, preventing the armor layer 4 from causing compression and wear to the internal anchor-type support structure 1 and core cable 2; multiple galvanized steel wires are spirally wound to form the armor layer 4, forming a cage-like rigid protective skeleton that can evenly withstand external compression, tension, and bending loads, and provide overall constraint and protection for the inner structure; the outer sheath layer 5 is made of aging-resistant and flame-retardant polyolefin integrally extruded and completely covers the outer surface of the armor layer 4, isolating it from external moisture, dust, ultraviolet rays, and acid and alkali corrosive media, while relying on its own flame-retardant and aging-resistant properties to block the spread of open flame and delay material aging and failure.

[0063] In this embodiment, the inner lining layer 3 can buffer the hard contact stress of the armor layer 4, protecting the internal cable support, ventilation cavity 121 and heat insulation cavity 13 from being squeezed and deformed, and maintaining the long-term working accuracy of the internal self-adjusting cavity structure; the armor layer 4 formed by galvanized steel wire winding significantly improves the cable's tensile, compressive and bending mechanical strength, and is suitable for complex laying conditions such as direct burial, conduit, and overhead, avoiding the cable from being deformed by external forces, which would cause the core cable 2 to be eccentric and the insulation distance to shift; the outer sheath layer 5 is made of aging-resistant and flame-retardant polyolefin material, which has weather resistance, UV resistance, moisture resistance, corrosion resistance and flame retardant properties, and can effectively delay the aging and erosion of the cable surface by the external environment, prevent the flame from spreading along the cable, and improve the cable's fire safety and long-term outdoor service capability; the three layers are sequentially composited from the inside to the outside, with clear structural layers and progressively superimposed protective functions, achieving structural buffering and shaping protection internally, and mechanical strengthening, corrosion resistance, weather resistance and flame retardant protection externally, thus improving the overall mechanical reliability, environmental adaptability and service life of the high-voltage cable.

[0064] Reference Figure 1 , Figure 2 , Figure 4 and Figure 5 It also includes a connector 6, both ends of which are provided with a second slot 61 that engages with the outer protective layer. The connector 6 is provided with a wire hole 62 that connects the two sets of second slots 61. The connector 6 is provided with a first diversion cavity 63 and a second diversion cavity 64. A first connecting pipe 631 that communicates with the first diversion cavity 63 and a second connecting pipe 641 that communicates with the second diversion cavity 64 are fixedly installed on the side wall of the connector 6. The first diversion cavity 63 and the second diversion cavity 64 are respectively connected to the ventilation cavity 121 in the anchor-type support structure 1 on both sides.

[0065] The connector 6 is engaged with the outer protective layer of the cable end through the second slots 61 at both ends, realizing the positioning and sealing connection between the connector 6 and the cable body. The core cable 2 passes through the through hole 62 to complete the splicing. The first diversion cavity 63 and the second diversion cavity 64 are respectively connected to the ventilation cavity 121 inside the anchor-type support structure 1 at both ends of the cable. The first connecting pipe 631 and the second connecting pipe 641 serve as external medium access ports, which can introduce cooling airflow into the first diversion cavity 63 and the second diversion cavity 64. After the cooling medium is evenly distributed through the diversion cavity, it is introduced into the ventilation cavity 121, forming a through-type circulating heat dissipation air channel along the cable axis, realizing continuous convective heat exchange inside the entire cable section.

[0066] In this embodiment, the connector 6 is snapped into the outer protective layer via the second slot 61, ensuring reliable installation and high coaxiality. This guarantees a neat and orderly connection structure and prevents deformation at the end from affecting the centering accuracy of the internal core cable 2. The through hole 62 allows for smooth passage of the core cable 2, resulting in a neat and orderly cable connection layout and ensuring electrical connection stability. The first and second diversion chambers 63 and 64 distribute and buffer the airflow evenly, smoothly introducing cooling medium into the ventilation chambers 121 on both sides, avoiding turbulent airflow impact, and ensuring uniform heat dissipation along the length of the ventilation chambers 121. The first connecting pipe 631 and the second connecting pipe 641 are reserved with external ventilation interfaces, which can be connected to an active air cooling system to enhance heat dissipation under high current and long-distance laying conditions, further reducing the operating temperature rise of the core cable 2 and delaying the thermal aging of the insulation layer.

[0067] It enables the axial passage of the ventilation cavity 121 and the function of external circulation heat dissipation, forming a combination of passive heat dissipation and active heat dissipation with the passive adaptive temperature control structure inside the cable, which greatly expands the cable's applicable current carrying range and adaptability to complex working conditions.

[0068] Example 2: Refer to Figure 7 The structure of this embodiment is basically the same as that of Embodiment 1, except that when the anchor support structure 1 is a spiral structure, the three sets of spiral anchor support structures 1 are spirally wound along the cable axis.

[0069] Three sets of spiral anchor-type support structures 1 are evenly distributed and spliced ​​together in a spiral shape along the cable axis. The cable support formed after splicing can still stably clamp the core cable 2 through the first slot 15, ensuring the centering positioning accuracy of the core cable 2. At the same time, the ventilation cavity 121 inside the spiral anchor-type support structure 1 forms a spiral flow channel synchronously with the spiral layout of the support structure. When the cooling medium (airflow) enters the ventilation cavity 121, it will flow along the spiral flow channel along the cable axis. Compared with the straight flow channel in Embodiment 1, the spiral flow channel significantly extends the flow path of the cooling medium in the cable, increases the contact heat exchange time between the cooling medium and the anchor support arc-shaped body 12, the first heat-conducting support head 143, and the second heat-conducting support head 145, enhances the turbulent heat exchange effect, and thus significantly improves the overall heat dissipation efficiency of the cable.

[0070] This design is particularly suitable for long-distance, high-current laying scenarios with extremely high heat dissipation requirements. It effectively solves the technical pain point of insufficient heat dissipation and heat accumulation in the middle of long-distance cables due to the fast flow rate of the cooling medium and insufficient heat exchange in traditional straight ventilation ducts. At the same time, the winding layout of the spiral anchor-type support structure 1 can further enhance the overall tensile and torsional mechanical strength of the cable, adapt to complex laying conditions, and does not affect the adaptive temperature control adjustment function of the first support heat-conducting bracket 14 and the second support heat-conducting bracket 7. Compared with the first embodiment, it achieves further optimization in heat dissipation efficiency and mechanical stability.

[0071] In summary, this invention, through the circumferentially uniform arrangement of three sets of anchor-type support structures 1, can achieve stable and centered positioning of the core cable 2, ensuring uniform internal insulation distance, effectively avoiding electric field distortion and partial discharge, and significantly improving electrical safety performance under high-voltage operating conditions. The anchor-type support structure 1 can be linear or spiral. The linear structure is easy to extrude and integrally mold, with a simple production process and low manufacturing cost. The spiral structure allows the ventilation cavity 121 to form a spiral flow channel, extending the flow and heat exchange time of the cooling medium, significantly improving the heat dissipation capacity in long-distance, high-current scenarios, while also enhancing the overall tensile and torsional mechanical properties of the cable. The core cable 2 adopts a multi-layer coaxial composite insulation structure. In conjunction with the heat-resistant and anti-aging properties of the cross-linked polyethylene layer 23, a multi-layer insulation protection system is constructed, which not only ensures the reliability of electrical insulation but also delays the thermal aging of the insulation layer, thereby improving the cable's high-temperature resistance and service life. The outer protective layer is composed of an inner lining layer 3, an armor layer 4, and an outer sheath layer 5, which successively achieve multiple functions such as buffer protection, mechanical reinforcement, flame retardancy and weather resistance, corrosion resistance and UV resistance, making it suitable for complex laying environments such as direct burial, overhead, and conduit installation. The matching connector 6 can be precisely snapped and sealed with the cable end, and the cooling medium can be introduced through the diversion cavity and connecting pipe, so that the ventilation cavity 121 forms a through-type heat dissipation air duct, forming a composite heat dissipation mode that combines internal passive adaptive heat dissipation and external active air cooling.

[0072] In this invention, the deformable metal ring 141, the first thermally conductive support head 143, and the second thermally conductive support head 145 in the first thermally conductive support bracket 14 work together to integrate temperature sensing and heat conduction, lever deformation amplification, core cable 2 centering and limiting, airflow turbulence heat dissipation, and chamber volume adjustment, breaking through the limitation of single-function components and significantly improving overall performance; the first thermally conductive support bracket 14 and the second thermally conductive support bracket 7 have complementary internal and external dual heat source responses, respectively sensing the temperature rise of the core cable 2 itself and the external ambient temperature, realizing passive adaptive control under all working conditions for high-temperature enhanced heat dissipation, low-temperature heat insulation, and high-temperature environmental heat intrusion prevention, with a protection range and adaptability far superior to a single bracket working independently; ventilation cavity 12 The dual-cavity functional partitioning of the insulation cavity 13 and the deformable support bracket enables dynamic adjustment of the spatial proportions, overcoming the shortcomings of traditional cables that can only provide passive and static protection, and taking into account both heat dissipation and heat preservation requirements. The first thermally conductive support head 143 with a pentagonal hollow structure and the second thermally conductive support head 145 with a streamlined airfoil structure work together to achieve multiple effects such as multi-faceted heat conduction, stress dispersion, lever force transmission, and turbulence-enhanced heat dissipation, thus optimizing the structural mechanical properties and fluid heat dissipation performance. The anchor-type support structure 1 also serves multiple functions such as mechanical support, core cable 2 positioning, and cavity forming, realizing the integrated support, positioning, and heat dissipation channel, simplifying the overall structure, improving space utilization and operational reliability.

[0073] This invention eliminates the need for sensors and electronic control components. It achieves passive intelligent control driven by the heat generated by the core cable 2, relying solely on the material's own temperature deformation characteristics. The structure is simple, reliable, and highly adaptable to various environments. It effectively solves problems such as limited heat dissipation capacity, poor adaptability to high and low temperature conditions, easy insulation aging, heat accumulation in the middle section during long-distance laying, and weak mechanical protection in traditional high-voltage cables. It significantly improves the high-temperature resistance, aging resistance, deformation resistance, and operational stability of high-voltage cables under extreme temperature conditions. It has a wide range of applications and good potential for widespread application. The above description is merely a preferred embodiment of the invention and does not constitute any limitation on the invention. Although the invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the invention, without departing from the scope of the invention, still fall within the scope of the invention.

Claims

1. A high-voltage cable resistant to ageing and high temperatures, comprising a core cable (2), characterised in that, Also includes: Anchor-type support structure (1), three sets of the anchor-type support structure (1) are combined to form a cable body bracket, and a first slot (15) is provided between the cable body brackets, and the core cable (2) is inserted into the first slot (15); The outer protective layer is fitted onto the outside of the cable body support. The anchor-type support structure (1) includes a heat insulation strip (11), on which an anchor support arc-shaped body (12) is fixedly installed. A ventilation cavity (121) is provided inside the anchor support arc-shaped body (12). A heat insulation cavity (13) is provided between the heat insulation strip (11) and the anchor support arc-shaped body (12). The heat insulation cavity (13) is filled with inert gas and, together with the heat insulation strip (11) and the second support heat-conducting bracket (7), forms a low-temperature heat insulation barrier. The first support heat-conducting bracket (14) is disposed in the ventilation cavity (121). The first support heat-conducting bracket (14) absorbs the heat generated when the core cable (2) is working and deforms to adjust the space ratio between the ventilation cavity (121) and the heat insulation cavity (13). The second support heat-conducting bracket (7) is set in the heat insulation cavity (13). The second support heat-conducting bracket (7) absorbs heat from the external environment and deforms to adjust the space ratio between the ventilation cavity (121) and the heat insulation cavity (13).

2. A high-voltage cable resistant to ageing and high temperatures according to claim 1, characterised in that, When the heat generated by the core cable (2) exceeds the working threshold of the core cable (2), the first supporting heat-conducting bracket (14) drives the space of the ventilation cavity (121) to increase and the space of the heat insulation cavity (13) to decrease. When the heat conducted from the external environment to the second support heat-conducting bracket (7) is lower than the normal operating temperature threshold of the core cable (2), the second support heat-conducting bracket (7) drives the space of the heat insulation cavity (13) to increase and the space of the ventilation cavity (121) to decrease. When the heat conducted from the external environment to the second support heat-conducting bracket (7) is higher than the highest ambient temperature threshold required for the core cable (2) to work, the space of the second support heat-conducting bracket (7) drives the heat insulation cavity (13) to decrease.

3. A high-voltage cable according to claim 2, c h a r a c t e r i s e d in that The anchor-type support structure (1) is constructed as a straight extruded structure extending along the cable axis. The three sets of anchor-type support structures (1) are evenly distributed along the circumference of the core cable (2) and spliced ​​together.

4. The high-voltage cable of claim 2, wherein the cable is resistant to aging and high temperatures. When the anchor support structure (1) is a spiral structure, the three sets of spiral anchor support structures (1) are spirally wound along the cable axis.

5. A high-voltage cable according to claim 3 or 4, c h a r a c t e r i s e d in that The first heat-conducting support bracket (14) includes a deformable metal ring (141), a first connecting rod (142) is fixedly installed on the deformable metal ring (141), a first heat-conducting support head (143) is fixedly installed on the first connecting rod (142), and the first heat-conducting support head (143) is inserted into the gap in the ventilation cavity (121) facing the center of the high-voltage cable; A second connecting rod (144) is fixedly installed on the deformable metal ring (141), and a second heat-conducting support head (145) is fixedly installed on the second connecting rod (144). The second heat-conducting support head (145) is inserted into the gap in the ventilation cavity (121) near the heat insulation cavity (13).

6. A high-voltage cable according to claim 5, c h a r a c t e r i s e d in that The first heat-conducting support head (143) is a pentagonal hollow structure. Its outer contour is formed by the V-shaped second connector (1433) at the top, the first arc-shaped edge (1432) that narrows inward on both sides, and the V-shaped first connector (1431) at the bottom in sequence. The first connector (1431) is fixedly connected to the first connecting rod (142). The edges of the pentagonal hollow structure are rounded, and its outer wall is in multi-faceted contact with the inner wall of the anchor support arc body (12) to absorb the heat generated by the core cable (2) and transfer it to the deformable metal ring (141). When the heat generated by the core cable (2) causes the deformable metal ring (141) to expand, the expansion and deformation of the deformable metal ring (141) drives the first connecting rod (142) to move. The first connecting rod (142) drives the first connecting piece (1431) to unfold. Through the transmission of the first arc-shaped edge (1432), the second connecting piece (1433) is driven to expand outward, so that the overall radial dimension of the first heat-conducting support head (143) increases and presses against the anchor support arc-shaped body (12).

7. A high-voltage cable according to claim 5, c h a r a c t e r i s e d in that The second heat-conducting support head (145) is a long strip hollow airfoil structure with a streamlined shape that is wide in the middle and narrow at both ends. It includes a V-shaped third connector (1451) fixedly connected to the second connecting rod (144), a second arc-shaped edge (1452) connected to both ends of the third connector (1451), and a third arc-shaped edge (1453) located at the end. The hollow airfoil structure has a rounded transition at the edge, and its outer wall is in multi-faceted contact with the inner wall of the anchor-supported arc-shaped main body (12). When the heat generated by the core cable (2) causes the deformable metal ring (141) to expand, the expansion and deformation of the deformable metal ring (141) drives the second connecting rod (144) to move. The second connecting rod (144) drives the third connecting piece (1451) to unfold. Through the transmission of the second arc-shaped edge (1452), the third arc-shaped edge (1453) is driven to expand outward, driving the second heat-conducting support head (145) to extend along the streamlined contour and closely adhere to the inner wall of the anchor support arc-shaped body (12). At the same time, it drives the cavity walls of the ventilation cavity (121) and the heat insulation cavity (13) to move towards the heat insulation cavity (13) to compress the space of the heat insulation cavity (13) and expand the heat dissipation channel of the ventilation cavity (121).

8. The high-voltage cable with aging resistance and high temperature resistance according to claim 1, characterized in that, The core cable (2) includes a main conductor (21), the outer periphery of which is tightly covered with a main insulation layer (22), and a cross-linked polyethylene layer (23) and an outer sheath insulation layer (24) are sequentially and coaxially arranged on the outer side of the main insulation layer (22), and the outer wall of the outer sheath insulation layer (24) is in contact with the inner wall of the anchor support arc-shaped body (12).

9. The high-voltage cable with aging resistance and high temperature resistance according to claim 1, characterized in that, The outer protective layer includes an inner lining layer (3), an armor layer (4), and an outer sheath layer (5) arranged sequentially from the inside to the outside. The inner lining layer (3) covers the outside of the cable support, the armor layer (4) is formed by spirally winding multiple galvanized steel wires around the outer surface of the inner lining layer (3), and the outer sheath layer (5) is made of aging-resistant and flame-retardant polyolefin material extruded onto the outer surface of the armor layer (4).

10. A high-voltage cable resistant to aging and high temperature according to claim 1, characterized in that, It also includes a connector (6), both ends of which are provided with a second slot (61) that engages with the outer protective layer. The connector (6) is provided with a wire hole (62) that connects the two sets of second slots (61). The connector (6) is provided with a first diversion cavity (63) and a second diversion cavity (64). A first connecting pipe (631) that communicates with the first diversion cavity (63) and a second connecting pipe (641) that communicates with the second diversion cavity (64) are fixedly installed on the side wall of the connector (6). The first diversion cavity (63) and the second diversion cavity (64) are respectively connected to the ventilation cavity (121) in the anchor-type support structure (1) on both sides.

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