High-thermal-conductivity graphene composite insulation high-voltage-resistant power cable
By introducing a high-thermal-conductivity graphene composite insulation structure into power cables, the problem of local overheating caused by the difference in thermal expansion coefficients between graphene and copper is solved, efficient heat dissipation and structural stability of the cable under complex deformation conditions are achieved, and the service life and safety of the cable are improved.
Patent Information
- Application Number
- CN202511293332.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-11
- Publication Date
- 2025-10-17
AI Technical Summary
The thermal expansion coefficients of graphene and copper in traditional composite insulated high-voltage power cables are quite different, resulting in the inability to effectively transfer heat from the heat dissipation shielding layer to the outer layer, forming local overheating areas, which affects the service life and safety of the power cables.
It adopts a high thermal conductivity graphene composite insulation structure, including a fiber layer, a copper core, a shielding layer, a gradient heat dissipation layer, a flexible thermal conductive path and a linkage component. Through the cooperation of the graphene-copper composite layer, the graphene-ceramic transition layer and the polyimide layer, a smooth transition of the thermal expansion coefficient and flexible thermal conductivity are achieved. Combined with liquid metal glue and carbon nanotube-copper thermal conductive columns, efficient vertical and in-plane heat dissipation paths are formed.
It effectively solves the problem of local overheating caused by differences in thermal expansion coefficients, ensures that the power cable maintains efficient heat dissipation under complex deformation conditions, avoids aging and structural fracture, and improves the service life and safety of the cable.
Smart Images
Figure CN120809364A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of power transmission, in particular to a high-thermal-conductivity graphene composite insulation high-voltage-resistant power cable. BACKGROUND
[0002] The composite insulation high-voltage-resistant power cable is a power transmission cable capable of long-term bearing high voltage and taking two or more insulating materials as an insulating layer, and the core function is to realize safe and low-loss transmission of electric energy under high-voltage working conditions. The vertical thermal conductivity of a traditional copper heat conducting band is lower than 10 W / m K, and cannot meet the heat dissipation demand in a high-power scene. In order to quickly conduct the heat generated by the power cable during work, most power cables select to add graphene, a material with high thermal conductivity.
[0003] The thermal expansion coefficients of graphene and copper in the existing product are quite different, the heat of the heat dissipation shielding layer cannot be effectively transferred to the outer layer, a local overheating area of 'internal heat and external cold' is formed, interface cracking is easily caused in long-term operation, the service life of the power cable is reduced, and even a safety accident is caused.
[0004] Therefore, the high-thermal-conductivity graphene composite insulation high-voltage-resistant power cable is provided to solve the above problems. SUMMARY
[0005] In order to make up for the above shortcomings, the application provides a high-thermal-conductivity graphene composite insulation high-voltage-resistant power cable, which aims to improve the problem of too large thermal expansion coefficient difference in the prior art.
[0006] In order to achieve the above purpose, the application adopts the following technical scheme: a high-thermal-conductivity graphene composite insulation high-voltage-resistant power cable, comprising a fiber layer and a copper core, the copper core is spirally distributed outside the fiber layer, and a shielding layer is fixedly connected to the side of the copper core away from the fiber layer, a gradient heat dissipation layer is arranged outside the shielding layer, a flexible heat conduction channel is arranged outside the gradient heat dissipation layer, a linkage assembly is fixedly connected between the flexible heat conduction channels, an insulation layer is arranged outside the flexible heat conduction channels, an armor layer is arranged outside the insulation layer, and a protective outer sleeve is arranged outside the armor layer.
[0007] Preferably, the gradient heat dissipation layer comprises a composite layer, a shielding layer is attached to the inner wall of the composite layer, a transition layer is attached to the outer wall of the composite layer, and a polyimide layer is attached to the outer wall of the transition layer.
[0008] Preferably, the composite layer is a graphene-copper composite layer, the transition layer is a graphene-ceramic transition layer, and a micro ball joint seat is fixedly connected to the polyimide layer.
[0009] Preferably, the linkage assembly comprises a rotating block, the main connecting line and the auxiliary connecting line are rotatably connected to the rotating block, the other end of the main connecting line is fixedly connected to the flexible heat-conducting channel, and the other end of the auxiliary connecting line is rotatably connected to the side surface of another rotating block.
[0010] Preferably, the flexible heat-conducting channel comprises a composite heat-conducting frame, the composite heat-conducting frame is filled with liquid metal glue, and the composite heat-conducting frame is penetrated by a heat-conducting column.
[0011] Preferably, the composite heat-conducting frame is a graphene-PI film and elastic shell composite heat-conducting frame, and the liquid metal glue is specifically gallium-indium alloy.
[0012] Preferably, the micro ball hinge seat is hingedly connected with a rotating block.
[0013] Preferably, the fiber layer, the main connecting line and the auxiliary connecting line are aramid fiber.
[0014] The present application has the following beneficial effects: 1. In the present application, the graphene-copper composite layer, the graphene-ceramic transition layer and the polyimide layer of the gradient heat dissipation layer cooperate to realize the smooth transition of the thermal expansion coefficient, and the heat-conducting column in the flexible heat-conducting channel further strengthens heat dissipation; the interface heat transfer between the shielding layer and the gradient heat dissipation layer has no bottleneck, and the copper core heat can be quickly conducted out, so as to avoid the aging and the decrease of the carrying capacity of the power cable caused by local overheating.
[0015] 2. In the present application, the central aramid fiber layer can bear axial large tension to avoid structural fracture; the rotating block connected by the spherical hinge can rotate within a certain angle range to adapt to the complex deformation such as bending and twisting of the power cable; and the main / auxiliary connecting line ensures that the rotating blocks can rotate synchronously to disperse the stress generated by the flexible heat-conducting channel when the power cable is bent.
[0016] 3. In the present application, high-performance materials such as graphene, aramid fiber and liquid metal glue are used to improve the heat conduction, insulation and mechanical properties, and to balance the high performance and flexibility, so as to avoid the installation limitations of traditional rigid high-voltage power cables. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 A perspective view of a high-heat-conducting graphene composite insulation high-voltage-resistant power cable is provided in the present application; Figure 2 A cross-sectional structure schematic view of a high-heat-conducting graphene composite insulation high-voltage-resistant power cable is provided in the present application; Figure 3 A structure schematic view of a copper core of a high-heat-conducting graphene composite insulation high-voltage-resistant power cable is provided in the present application; Figure 4A partial structure schematic diagram of a high-thermal-conductivity graphene composite insulation high-voltage-resistant power cable according to the present application; Figure 5 A connection relationship schematic diagram of a gradient heat dissipation layer of a high-thermal-conductivity graphene composite insulation high-voltage-resistant power cable according to the present application; Figure 6 A structure schematic diagram of a linkage assembly of a high-thermal-conductivity graphene composite insulation high-voltage-resistant power cable according to the present application; Figure 7 A structure schematic diagram of a flexible heat-conducting path of a high-thermal-conductivity graphene composite insulation high-voltage-resistant power cable according to the present application; Figure 8 A Figure 6 An enlarged view of A in the figure.
[0018] Legend: 1-copper core; 2-fiber layer, 3-shielding layer, 4-gradient heat dissipation layer, 5-flexible heat-conducting path, 6-linkage assembly, 7-insulation layer, 8-armor layer, 9-protection sheath, 10-composite layer, 11-transition layer, 12-polyimide layer, 13-micro spherical hinge base, 14-rotating block, 15-main connecting line, 16-secondary connecting line, 17-composite heat-conducting frame, 18-liquid metal adhesive, 19-heat-conducting column. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0020] Reference Figures 1 to 4In one embodiment, the application provides a high-thermal-conductivity graphene composite insulation high-voltage-resistant power cable, which comprises a fiber layer 2 and a copper core 1, characterized in that: the fiber layer 2 is an aramid fiber layer and is located at the most central position of the power cable in the radial direction, bears the axial tension and provides support for the copper core 1; the copper core 1 is distributed in a spiral shape along the outside of the aramid fiber layer 2, and the side of the copper core 1 away from the aramid fiber layer 2 is fixedly connected with a shielding layer 3. The shielding layer 3 is a graphene-enhanced semi-conductive shielding layer 3, which can optimize the electric field distribution; the outside of the shielding layer 3 is tightly attached with a gradient heat dissipation layer 4; the outside of the gradient heat dissipation layer 4 is provided with a flexible heat conduction channel 5, the flexible heat conduction channel 5 is spirally wound along the outer wall of the gradient heat dissipation layer 4; the flexible heat conduction channels 5 are distributed with a linkage assembly 6 along the spiral gap, and the linkage assembly 6 is linked with the flexible heat conduction channel 5 through a wire; the outside of the flexible heat conduction channel 5 is wrapped with an insulation layer 7, and the insulation layer 7 is composed of multiple layers of insulation materials; the outside of the composite insulation layer 7 is provided with a metal-ceramic armor layer 8, and the armor layer 8 is bonded with the composite insulation layer 7 through epoxy resin; the outside of the armor layer 8 is provided with a protective sheath 9, and the protective sheath 9 is coated with a zinc oxide self-repairing flame-retardant coating.
[0021] Referring to Figures 4 to 5 The gradient heat dissipation layer 4 has a three-layer gradient composite structure, which comprises, from inside to outside, a composite layer 10, a transition layer 11 and a polyimide layer 12, and the three-layer structure is tightly attached through a special process, without interface peeling. The composite layer 10 is a graphene-copper composite layer with high thermal conductivity, the transition layer 11 is a graphene-ceramic transition layer, which can smoothly transition the thermal expansion difference between the copper core 1 and the polyimide layer 12, and reduce thermal stress; the outer wall of the polyimide layer 12 is attached with the flexible heat conduction channel 5, which can further strengthen heat dissipation, and the three-layer gradient heat dissipation design realizes smooth transition of the thermal expansion coefficient.
[0022] Referring to Figure 7 The composite heat conduction frame 17 is mainly composed of multiple layers of graphene film and PI film, and the side surface of the composite heat conduction frame 17 is an elastic shell; the composite heat conduction frame 17 has excellent flexibility and can deform with the power cable; the composite heat conduction frame 17 is filled with a self-repairing liquid metal glue 18, which can repair micro-cracks generated in the bending process; the composite heat conduction frame 17 and the liquid metal glue 18 are internally penetrated by a heat conduction column 19, which is a carbon nanotube-copper heat conduction column, the heat conduction column 19 is distributed in a regular hexagon and penetrates the upper and lower end surfaces of the composite heat conduction frame 17 and the liquid metal glue 18, forming a vertical flexible heat conduction channel 5, which strengthens vertical heat dissipation; the overall flexible heat conduction channel 5 can also maintain good heat conduction efficiency when it is bent to a certain extent.
[0023] Referring to Figure 4 and Figure 6The linkage assembly 6 includes a rotating block 14, which is distributed along the spiral gap of the flexible heat-conducting path 5. According to actual needs, 3-6 linkage assemblies 6 can be distributed in one circumference. Each rotating block 14 is provided with a wire groove, and a micro-ceramic pulley is embedded in the wire groove. The main connecting wire 15 is wound around the pulley and forms a rotation connection with the rotating block 14 to prevent the main connecting wire 15 from being subjected to torsional stress; a wire groove is also provided on the side circumference of the rotating block 14, and a tangential pulley is also embedded in the wire groove. The secondary connecting wire 16 is wound around the tangential pulley and forms a rotation connection with the rotating block 14 to ensure that the tension direction of the secondary wire is tangent to the rotation plane of the rotating block 14; the other end of the main connecting wire 15 is fixedly connected to the composite heat-conducting frame 17 of the flexible heat-conducting path 5, which can bear the tensile / compressive force when the flexible heat-conducting path 5 is bent; the other end of the secondary connecting wire 16 is wound around the tangential pulley on the side of the adjacent rotating block 14 to form a circumferential linkage network, realizing the stress diffusion effect of "single block rotation → multi-block collaboration".
[0024] Reference Figure 8 A rotating block 14 is hinged on the micro ball joint seat 13, and the micro ball joint seat 13 is fixed to the outer wall of the polyimide layer 12. The axis of the micro ball joint seat 13 is consistent with the radial direction of the microporous polyimide layer 12; the bottom of the rotating block 14 is integrally formed with a ball head structure adapted to the micro ball joint seat 13, ensuring that the rotating block 14 can rotate freely around the micro ball joint seat 13 within a certain angle range, and adapt to complex deformations such as bending and twisting of power cables; the inside of the ball socket of the micro ball joint seat 13 can be coated with a molybdenum disulfide self-lubricating coating to reduce the rotation resistance of the rotating block 14 and avoid rotation jamming due to friction.
[0025] The fiber layer 2, main connecting wire 15, and auxiliary connecting wire 16 are all made of high-strength aramid fiber. Fiber layer 2, located at the very center of the power cable, bears the vast majority of the cable's axial tension, providing stable support for the copper core 1 and preventing it from breaking due to axial tension. The main connecting wire 15 and auxiliary connecting wire 16 have high breaking strength. Their surfaces are roughened to increase friction with the pulleys of the rotating block 14, preventing slippage when the power cable bends and ensuring smooth stress transfer.
[0026] Working principle: The aramid fiber layer 2 at the radial center of the power cable bears most of the axial tension, providing stable support for the copper core 1 distributed spirally on the outside, preventing the copper core 1 from breaking due to axial tension.
[0027] The copper core 1 itself has high thermal conductivity, and the heat generated when the current passes is first transmitted to the outer shielding layer 3, the interface thermal resistance of the shielding layer 3 and the gradient heat dissipation layer 4 is very small, and the heat quickly enters the gradient heat dissipation layer 4; the graphene-copper composite layer 10 of the gradient heat dissipation layer 4 realizes heat conduction; the graphene-ceramic transition layer 11 smoothly transitions the thermal expansion difference between the copper core 1 and the polyimide layer 12, avoiding interlayer peeling caused by thermal stress; the polyimide layer 12 does not hinder the heat transfer outward.
[0028] The flexible heat conduction path 5 outside the gradient heat dissipation layer 4 further strengthens heat dissipation; the composite heat conduction frame 17 in the flexible heat conduction path 5 realizes rapid heat conduction in the plane; the self-repairing liquid metal glue 18 filled inside fills the micro-cracks and ensures the continuity of heat conduction; the carbon nanotube-copper composite heat conduction column 19 forms a vertical heat conduction path to quickly conduct heat from the inner layer to the outer layer. Even if the power cable is bent, the flexible heat conduction path 5 can maintain good thermal conduction efficiency.
[0029] The micro ball hinge seat 13 of the outer wall of the gradient heat dissipation layer 4 articulates the rotating block 14 of the pressure distribution assembly, allowing the rotating block 14 to freely rotate within a certain angle range, adapting to complex deformations such as bending and twisting of the power cable; the main pressure distribution line of the pressure distribution assembly bears the tensile / compressive force when the flexible heat conduction path 5 is bent, and the auxiliary pressure distribution line forms a stress network of "single block rotation → multiple blocks coordination", when a local stress occurs, the rotating block 14 will drive the adjacent two rotating blocks 14 to rotate synchronously through the auxiliary pressure distribution line, and the adjacent rotating blocks 14 will drive the more distant rotating blocks 14 through the auxiliary pressure distribution line, finally, the local stress borne by one rotating block 14 will be transmitted to all rotating blocks 14 on the circumference through the ring linkage of the auxiliary pressure distribution line, realizing the conversion of "local stress → uniform stress on the entire circumference".
[0030] Finally, it should be noted that: the above is only a preferred embodiment of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements for some technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A high thermal conductivity graphene composite insulated high voltage resistant power cable, comprising a fiber layer (2) and a copper core (1), characterized in that: The copper core (1) is spirally distributed on the outside of the fiber layer (2), and a shielding layer (3) is fixedly connected to the side of the copper core (1) away from the fiber layer (2), a gradient heat dissipation layer (4) is provided on the outside of the shielding layer (3), a flexible heat conduction path (5) is provided on the outside of the gradient heat dissipation layer (4), a linkage component (6) is fixedly connected between the flexible heat conduction paths (5), an insulating layer (7) is provided outside the flexible heat conduction paths (5), an armor layer (8) is provided on the outside of the insulation layer (7), and a protective jacket (9) is provided on the outside of the armor layer (8).
2. The high thermal conductivity graphene composite insulated high voltage power cable according to claim 1, characterized in that: The gradient heat dissipation layer (4) comprises a composite layer (10), the inner wall of the composite layer (10) is adhered to a shielding layer (3), the outer wall of the composite layer (10) is adhered to a transition layer (11), and the outer wall of the transition layer (11) is adhered to a polyimide layer (12).
3. The high thermal conductivity graphene composite insulated high voltage power cable according to claim 2, characterized in that: The composite layer (10) is a graphene-copper composite layer, the transition layer (11) is a graphene-ceramic transition layer, and a micro ball joint seat (13) is fixedly connected to the polyimide layer (12).
4. The high thermal conductivity graphene composite insulated high voltage power cable according to claim 1, characterized in that: The linkage assembly (6) includes a rotating block (14), a main connecting line (15) and a secondary connecting line (16) are rotatably connected to the rotating block (14), and a secondary connecting line (16) is provided. The other end of the main connecting line (15) is fixedly connected to the flexible heat-conducting path (5), and the other end of the secondary connecting line (16) is rotatably connected to the side surface of another rotating block (14).
5. The high thermal conductivity graphene composite insulated high voltage power cable according to claim 1, characterized in that: The flexible heat-conducting path (5) comprises a composite heat-conducting frame (17), the composite heat-conducting frame (17) is filled with liquid metal glue (18), and a heat-conducting column (19) runs through the composite heat-conducting frame (17).
6. The high thermal conductivity graphene composite insulated high voltage power cable according to claim 5, characterized in that: The composite heat-conducting frame (17) is a composite heat-conducting frame of a graphene-PI film and an elastic shell, and the liquid metal glue (18) is specifically a gallium-indium alloy.
7. The high thermal conductivity graphene composite insulated high voltage power cable according to claim 3, characterized in that: A rotating block (14) is hingedly connected to the micro ball joint seat (13).
8. The high thermal conductivity graphene composite insulated high voltage power cable according to claim 1, characterized in that: The fiber layer (2), the main connecting line (15), and the secondary connecting line (16) are all made of aramid fibers.