Multi-functional overhead cable for power transmission
Patent Information
- Application Number
- CN202610949130.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-29
- Publication Date
- 2026-08-21
AI Technical Summary
然而，在实际应用过程中，部分架空电缆在高寒、重覆冰以及昼夜温差较大的环境下，容易受到低温条件的影响，导致外护套及绝缘层柔性下降，当线缆长期处于低温、风摆或舞动状态时，其内部结构容易因反复弯曲而产生局部应力集中，硬化的非金属材料在交变动态应力下容易产生微小裂纹，进而加速绝缘性能的疲劳衰减，进而影响线缆的长期运行稳定性现有架空电缆对温度变化的适应能力较差，在昼夜温差较大或环境温度快速变化的情况下，电缆内部材料容易因热胀冷缩产生应力集中现象，长期作用下可能导致结构疲劳及性能衰减，同时，现有结构缺乏有效的内部热循环与均温机制，无法对电缆内部温度进行主动调节，使得局部区域容易出现过冷或过热现象，进一步影响输电稳定性，为此，本申请提出一种电力传输的多功能架空电缆
1、本发明通过在线缆内部设置导热管、传热管、加热囊，并配合外部热循环装置形成导热介质循环通道，当绝缘导热油在电缆内部流动时，将外部输入的或内部集聚的热量通过导热套内的石墨烯导热层沿周向均匀扩散，提升了线缆在极端极寒工况下的整体温度稳定度，有效缓解了外护套和绝缘层在超低温下的硬化、冷脆现象，保持了线缆的动态柔韧性；
Smart Images
Figure CN122619480A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cable-related technology, specifically to a multifunctional overhead cable for power transmission. Background Technology
[0002] As an important power transmission carrier in the power transmission and distribution system, overhead cables are widely used in cross-regional power transmission, urban power distribution networks and power supply lines in complex terrain. Existing overhead cables are usually composed of conductors, insulation layers and outer sheaths. They are erected between poles or supporting structures to realize long-distance transmission of electrical energy. Compared with traditional bare conductors, overhead cables have advantages such as better insulation performance, higher safety and relatively less susceptibility to external environmental influences. However, in practical applications, some overhead cables are easily affected by low temperatures in environments with high altitudes, heavy icing, and large day-night temperature differences. This leads to a decrease in the flexibility of the outer sheath and insulation layer. When the cable is in a state of low temperature, wind swaying, or galloping for a long time, its internal structure is prone to local stress concentration due to repeated bending. Hardened non-metallic materials are prone to micro-cracks under alternating dynamic stress, which accelerates the fatigue decay of insulation performance and affects the long-term operational stability of the cable. Existing overhead cables have poor adaptability to temperature changes. In the case of large day-night temperature differences or rapid changes in ambient temperature, the internal materials of the cable are prone to stress concentration due to thermal expansion and contraction. Under long-term action, this may lead to structural fatigue and performance degradation. At the same time, the existing structure lacks an effective internal thermal circulation and temperature equalization mechanism, and cannot actively regulate the internal temperature of the cable, making it easy for local areas to become too cold or too hot, further affecting the stability of power transmission. Therefore, this application proposes a multifunctional overhead cable for power transmission. Summary of the Invention
[0003] The purpose of this invention is to provide a multifunctional overhead cable for power transmission to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a multifunctional overhead cable for power transmission, comprising a cable, wherein a core for power transmission is inserted inside the cable, and multiple isolation plates are fixedly installed inside the cable, the multiple isolation plates being distributed at intervals along the axial direction of the cable, adjacent two isolation plates being connected by a protective sleeve to form multiple independent functional sections, a guide frame being provided inside the protective sleeve, the guide frame being located between corresponding two isolation plates, and the guide frame being sleeved on the outside of the core for supporting and guiding the core and maintaining its stable position inside the protective sleeve, and multiple heating elements being embedded on the outer surface of the guide frame, the multiple heating elements being evenly distributed along the circumference of the guide frame and arranged in a ring.
[0005] As a further embodiment of the present invention, each of the heating bladders is provided with a heat transfer tube, and another heating bladder at the corresponding position is provided with a heat conduction tube. The surface of the isolation plate is provided with fixing holes, each fixing hole corresponding to a heating bladder at the corresponding position. The ends of the heat transfer tube and the heat conduction tube that are far apart from each other are both inserted and fixed in the corresponding fixing holes.
[0006] As a further aspect of the present invention, movable components are fixedly installed at the ends of the heat transfer pipe and the heat conduction pipe that are close to each other. The two movable components are connected by a swivel sleeve, which is respectively fitted onto the outer surface of the corresponding movable component. By setting movable components at the ends of the heat transfer pipe and the heat conduction pipe that are close to each other, and using swivel sleeves to connect the two movable components, the connection is transformed from a rigid fixed connection to a swivel flexible connection structure. This ensures the connectivity of the heat conduction channel while improving the angle adaptability between the heat transfer pipe and the heat conduction pipe. It also makes it less likely for rigid stress concentration to occur at the connection when the cable is bent, erected, or subjected to external force disturbance. This improves the flexibility and operational reliability of the overall structure and reduces the risk of damage to the connection or obstruction of heat conduction medium transmission due to repeated bending.
[0007] As a further embodiment of the present invention, the heat transfer tube is two interconnected tube sections connected by a central tube. Two backflow plugs are movably installed inside the central tube. A connecting ring is fixedly installed at one end of each of the two backflow plugs that are close to each other. The two connecting rings are connected by a plurality of shape memory metal sheets. The plurality of shape memory metal sheets are distributed at intervals along the circumference of the connecting rings and arranged in a ring shape.
[0008] As a further embodiment of the present invention, the sidewall of the central tube is provided with a plurality of rectangular holes, each of the memory metal sheets is arc-shaped and extends through the corresponding rectangular holes into the interior of the heating bladder, the interior of the heating bladder is filled with insulating heat-conducting oil, and the interior of the heat transfer tube and the heat conduction tube is provided with a circulation tube.
[0009] As a further embodiment of the present invention, the circulation tube is inserted inside the backflow plug, and a heat-conducting frame is fixedly installed on the side of the two connecting rings that are close to each other. The heat-conducting frame is fixedly connected to the corresponding shape memory metal sheet, and the heat-conducting frame maintains a sliding contact with the outer surface of the heat-conducting tube. By inserting the circulation tube inside the backflow plug, the heat-conducting medium is kept to flow continuously in the valve-controlled structure. At the same time, a heat-conducting frame is set on the side of the two connecting rings that are close to each other, and the heat-conducting frame is fixedly connected to the shape memory metal sheet, and the heat-conducting frame maintains a sliding contact with the outer surface of the heat-conducting tube, so that the heat transferred by the heat-conducting tube can be stably conducted to the shape memory metal sheet, thereby improving the temperature transfer efficiency and response sensitivity.
[0010] As a further embodiment of the present invention, a flow guide groove is provided on the side of the backflow plug away from the connecting ring. The flow guide groove is located inside the heat transfer tube. A sealing ring is fixedly installed at the end of the heat transfer tube near the backflow plug. The sealing ring slides and seals with the outer surface of the backflow plug.
[0011] As a further embodiment of the present invention, a connecting screw sleeve is provided between the heat-conducting pipe and an adjacent set of heat transfer pipes, and a connecting sleeve is movably installed inside the heat-conducting pipe and the heat transfer pipe, and the inner wall of the connecting screw sleeve is threadedly connected to the outer surface of the two connecting sleeves respectively.
[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention sets up heat-conducting pipes, heat transfer pipes, and heating chambers inside the cable, and forms a heat-conducting medium circulation channel in conjunction with an external heat circulation device. When the insulating heat-conducting oil flows inside the cable, the heat input from the outside or accumulated inside is evenly diffused circumferentially through the graphene heat-conducting layer inside the heat-conducting sleeve, which improves the overall temperature stability of the cable under extreme cold conditions, effectively alleviates the hardening and brittleness of the outer sheath and insulation layer at ultra-low temperatures, and maintains the dynamic flexibility of the cable. 2. This invention utilizes a shape memory metal sheet made of double-layer dissimilar metal composite as a temperature sensing core. When the ambient temperature drops to a preset threshold (such as the pre-freezing temperature), the shape memory metal sheet deforms and drives the backflow plug to move, so that the backflow groove automatically aligns and connects the pipeline, triggering a large-scale thermal convection. It also distributes the heat in the circulation pipe to the heating bag and the periphery of the cable, achieving the effects of timely temperature equalization, anti-frost, or assisting in de-icing. When the temperature rises, it can spontaneously block the large-scale convection, avoiding the superposition of heat sources during high-current power transmission, which could lead to overheating of the cable. 3. The circulation pipe in this invention is kept connected to the external heat circulation device, and the overall pipeline system is modularized and flexibly connected through flexible steering sleeves and heat transfer pipes. This structural design not only allows the cable to retain the advantages of traditional modular cutting and easy installation in short-distance special sections, but also ensures that when the cable is subjected to special micro-topography wind swaying and dancing, the internal fluid circulation channel and intelligent adjustment mechanism will not be squeezed and damaged by local radial force, thus ensuring the long-term stability of power transmission at harsh nodes. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the cable; Figure 3 This is a schematic diagram of the internal structure of the heat-conducting jacket; Figure 4 This is a schematic diagram of the structure during the decomposition of the heating capsule; Figure 5 This is a schematic diagram of the structure of the heating element and the steering sleeve; Figure 6 This is a schematic diagram of the internal structure of the heating capsule; Figure 7 This is a schematic diagram of the internal structure of the central tube; Figure 8 This is a schematic diagram of the internal structure of a heat pipe.
[0014] In the diagram: 1. Cable; 2. Wire core; 101. Protective sleeve; 102. Isolation plate; 103. Heat-conducting sleeve; 104. Heat-conducting pipe; 105. Guide frame; 106. Connecting screw sleeve; 107. Heat transfer pipe; 108. Circulation pipe; 201. Heating chamber; 202. Steering sleeve; 203. Moving part; 204. Central tube; 205. Backflow plug; 206. Memory metal sheet; 207. Connecting ring; 208. Heat conduction frame; 209. Flow guide groove; 210. Connecting sleeve; 211. Sealing ring. Detailed Implementation
[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0016] Example 1: Please refer to Figures 1-3 A multifunctional overhead cable for power transmission includes a cable 1, with a core 2 for power transmission running through the inside of the cable 1. The core 2 is formed by twisting multiple strands of wire. Multiple isolation plates 102 are fixedly installed inside the cable 1. The multiple isolation plates 102 are distributed at intervals along the axial direction of the cable 1. Adjacent isolation plates 102 are connected by a protective sleeve 101 and form multiple independent functional sections. The protective sleeve 101 has a guide frame 105 inside. The guide frame 105 is located between two corresponding isolation plates 102 and is sleeved on the outside of the wire core 2. It is used to support and guide the wire core 2 and keep its position stable inside the protective sleeve 101. Multiple heating bags 201 are embedded on the outer surface of the guide frame 105. The multiple heating bags 201 are evenly distributed along the circumference of the guide frame 105 and arranged in a ring. They are arranged in pairs and set in one of the mounting slots of the guide frame 105. The heating bags 201 can uniformly heat the outer area of the wire core 2. The outer surface of the guide frame 105 is fixedly fitted with a heat-conducting sleeve 103. The heat-conducting sleeve 103 is made of heat-conducting composite material, with a graphene heat-conducting layer inside and an elastic buffer layer on the outside. The elastic buffer layer is in close contact with the outer surface of multiple heating bags 201, so that the heat-conducting sleeve 103 can maintain stable contact when the heating bags 201 deform. The heat-conducting sleeve 103 is used to quickly transfer the heat generated by the heating bags 201 along the circumference and evenly diffuse it to the outer area of the wire core 2, so as to improve the heat transfer efficiency, avoid the temperature in local areas being too high or too low, and thus improve the adaptability of the cable 1 in low temperature, icing and other environments.
[0017] Example 2: Please refer to Figures 4-7 A multifunctional overhead power transmission cable, based on Embodiment 1, wherein heat transfer tubes 107 are inserted inside each heating bladder 201, and heat conduction tubes 104 are inserted inside the corresponding heating bladder 201. Fixing holes are opened on the surface of the isolation plate 102, and each fixing hole corresponds to the heating bladder 201 at the corresponding position. The ends of the heat transfer tubes 107 and heat conduction tubes 104 that are far apart from each other are inserted and fixed in the corresponding fixing holes. Both the heat transfer tube 107 and the heat conduction tube 104 have movable parts 203 fixedly installed at their close ends. The two movable parts 203 are connected by a steering sleeve 202. The steering sleeve 202 is respectively fitted on the outer surface of the corresponding movable part 203 and can slide along the axial direction of the movable part 203. The two ends of the steering sleeve 202 are rigid fixed sleeve structures, and the middle is a flexible silicone connection structure, which allows the adjacent structural units to generate angular deflection, thereby ensuring that the cable 1 has good flexible bending ability when erected, wound and swayed by wind. Both the heat transfer tube 107 and the heat conduction tube 104 are made of flexible weather-resistant material to adapt to the overall bending deformation of the cable 1. The heat transfer tube 107 consists of two interconnected tube sections. The two heat transfer tube sections 107 are connected by a central tube 204. Two backflow plugs 205 are movably installed inside the central tube 204. A connecting ring 207 is fixedly installed at the end of each of the two backflow plugs 205 that is close to each other. The two connecting rings 207 are connected by multiple shape memory metal sheets 206. The multiple shape memory metal sheets 206 are distributed at intervals along the circumference of the connecting rings 207 and arranged in a ring shape. The sidewall of the central tube 204 has multiple rectangular holes. Each memory metal sheet 206 has an arc-shaped structure and extends through the corresponding rectangular hole into the interior of the heating bladder 201. The memory metal sheet 206 is made of a double-layer dissimilar metal composite structure and can undergo reversible deformation with temperature changes. The interior of the heating bladder 201 is filled with insulating heat-conducting oil. A circulation pipe 108 is installed inside the heat transfer tube 107 and the heat conduction tube 104. The circulation pipe 108 is installed inside the backflow plug 205. The circulation pipe 108 is filled with a high-temperature heat medium provided by an external heat circulation device to serve as a continuous heat source. A heat-conducting frame 208 is fixedly installed on one side of each of the two connecting rings 207 that are close to each other. The heat-conducting frame 208 is fixedly connected to the corresponding memory metal sheet 206, and the heat-conducting frame 208 maintains sliding contact with the outer surface of the heat-conducting pipe 104, so that the heat transferred by the heat-conducting pipe 104 can be conducted to the memory metal sheet 206 through the heat-conducting frame 208, thereby driving the memory metal sheet 206 to deform. A flow guide groove 209 is provided on the side of the backflow plug 205 away from the connecting ring 207. The flow guide groove 209 is located inside the heat transfer tube 107. A sealing ring is fixedly installed at the end of the heat transfer tube 107 near the backflow plug 205. The sealing ring slides and seals with the outer surface of the backflow plug 205. The inner diameters of the heat transfer tube 107 and the central tube 204 are both larger than the outer diameter of the backflow plug 205. When the ambient temperature drops (such as in extremely cold freezing conditions), the shape memory metal sheet 206 contracts in response to temperature, driving the backflow plugs 205 on both sides to move closer to each other. This causes the guide groove 209 to move precisely to the position connecting the internal chambers of the heat transfer tube 107 and the central tube 204. At this time, the insulating heat-conducting oil, which was originally in a relatively static state in the heating bladder 201, achieves a large-scale through-flow through the guide groove 209, the central tube 204 and the heat transfer tube 107, so that the heat of the circulation tube 108 can be rapidly diffused to the entire heating bladder 201 through convection, achieving rapid ice melting and antifreeze throughout the entire line. Conversely, when the ambient temperature rises (such as during the day or in ice-free conditions), the shape memory metal sheet 206 undergoes reverse deformation, causing the two backflow plugs 205 to move, causing the guide groove 209 to be displaced from the connection position. The main body of the backflow plug 205 cuts off the heat transfer tube 107 from the central tube 204, limiting the convection range of the insulating heat transfer oil and confining the heat inside the central tube 204. It is worth noting that the circulation pipe 108 is installed through the movable part 203, and a flow gap is reserved between the inner wall of the movable part 203 and the heat conduction pipe 104, so that the insulating heat conduction oil inside the heating bag 201 can flow along the periphery of the heat conduction pipe 104 to ensure the continuity of heat transfer between each functional section. To avoid repetitive description, the structure of the area where the heat pipe 104 is located is set in a corresponding manner to the structure of the area where the heat transfer pipe 107 is located. Their connection method, installation method and movement relationship are the same. Those skilled in the art can directly understand the specific structure of the area where the heat pipe 104 is located based on the description of the area where the heat transfer pipe 107 is located, so it will not be described again.
[0018] like Figure 3 , Figure 4 , Figure 8As shown, the heat-conducting tubes 104 and heat transfer tubes 107 in each heat-conducting sleeve 103 are arranged in a corresponding manner along the axial direction of the cable 1. A connecting screw sleeve 106 is provided between the heat-conducting tube 104 and the adjacent set of heat transfer tubes 107. A connecting sleeve 210 is movably installed inside the heat-conducting tube 104 and the heat transfer tube 107. The inner wall of the connecting screw sleeve 106 is threaded to the outer surface of the two connecting sleeves 210 respectively. A sealing ring 211 is fixedly installed at the end of the heat-conducting tube 104 and the heat transfer tube 107 that are close to each other. When the connecting sleeve 106 rotates, the two connecting sleeves 210 approach each other under the action of threaded transmission and press the corresponding sealing rings 211 respectively, causing the sealing rings 211 to undergo elastic deformation, thereby improving the sealing performance at the connection between the heat pipe 104 and the heat transfer pipe 107 and reducing the possibility of leakage of insulating heat-conducting oil. Specifically, multiple heat-conducting sleeves 103 are arranged sequentially along the axial direction of the cable 1 to form a modular structure. Therefore, the length of the cable 1 can be adjusted according to the actual installation distance. The preset cutting position of the cable 1 is located in the area where the connecting screw sleeve 106 is located. The installer can select the corresponding connecting screw sleeve 106 position for cutting according to the actual usage requirements, so as to improve the adaptability of the cable 1 and reduce the installation difficulty. After the cutting is completed, the heat-conducting pipes 104 and heat transfer pipes 107 located at both ends of the cable 1 are still connected to the corresponding isolation plates 102 respectively. Since the isolation plates 102 can be connected to the external heat circulation device, which is an existing mature device, it will not be described in detail here. Therefore, the heat circulation device can directly form a communication structure with both ends of the cable 1, so that the insulating heat-conducting oil can circulate between the heat-conducting pipes 104, heat transfer pipes 107 and heating bags 201.
[0019] The working principle of this invention is: After the cable 1 is cut and erected in the power transmission span area between the two devices, the isolation plates 102 at both ends of the cable 1 are connected to the corresponding heat circulation devices, so that the heat circulation devices and the inside of the cable 1 form a communication structure. The heat circulation devices drive the insulating heat-conducting oil to circulate between the heat-conducting pipe 104, the heat transfer pipe 107 and the heating bag 201. At the same time, the circulation pipe 108 is kept in communication with the heat circulation device to maintain the continuous circulation and delivery of the heat-conducting medium. In special power transmission environments such as high altitude, low temperature and severe cold, and heavy icing, the heat circulation device continuously delivers heat to the inside of the cable 1. The flowing insulating heat-conducting oil transfers heat energy along the heat-conducting pipe 104 and conducts it to the shape memory metal sheet 206 through the heat-conducting frame 208, so that the shape memory metal sheet 206 maintains its temperature response capability. At the same time, the circulating insulating heat-conducting oil continuously heats the heating bag 201, thereby slowing down the hardening phenomenon of the cable 1 caused by the low temperature environment, improving the low temperature flexibility retention capability of the cable 1, and reducing the adverse effects of icing on the operating performance of the cable 1. In addition, in an operating environment with large day-night temperature differences, when the ambient temperature drops rapidly at night, the shape memory metal sheet 206 tends to stretch and pushes the backflow plugs 205 on both sides to move into the heat transfer tube 107, so that a connecting channel is formed between the central tube 204 and the heat transfer tube 107. At this time, the insulating heat-conducting oil inside the heating bag 201 can flow under the action of the guide groove 209 to compensate for the volume change caused by low temperature conditions, thereby reducing the phenomenon of local stress concentration. Meanwhile, the insulating heat-conducting oil in the circulation pipe 108 is continuously in a circulating state. The heat transferred by the heat-conducting pipe 104 is continuously conducted to the shape memory metal sheet 206 through the heat-conducting frame 208, and further diffuses into the heating bag 201, continuously heating the insulating heat-conducting oil inside the heating bag 201. As the heat accumulates, the internal temperature of the heating bag 201 gradually rises and remains relatively stable, thereby reducing the impact of drastic changes in ambient temperature on the flexibility of the cable 1, improving the cable 1's resistance to embrittlement and environmental adaptability in low-temperature frosting environments, and thus ensuring the stability and reliability of the power transmission process.
[0020] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A multifunctional overhead cable for power transmission, comprising a cable (1), characterized in that: The cable (1) is internally provided with a wire core (2) for power transmission. Multiple isolation plates (102) are fixedly installed inside the cable (1). The multiple isolation plates (102) are distributed at intervals along the axial direction of the cable (1). Adjacent isolation plates (102) are connected by a protective sleeve (101) to form multiple independent functional sections. A guide frame (105) is provided inside the protective sleeve (101). The guide frame (105) is located between two corresponding isolation plates (102) and is sleeved on the outside of the wire core (2) to support and guide the wire core (2) and keep its position stable inside the protective sleeve (101). Multiple heating bags (201) are embedded on the outer surface of the guide frame (105). The multiple heating bags (201) are evenly distributed along the circumference of the guide frame (105) and arranged in a ring.
2. The multifunctional overhead cable for power transmission according to claim 1, characterized in that: Each heating bladder (201) has a heat transfer tube (107) inside, and a heat conduction tube (104) is inserted inside the corresponding heating bladder (201). The surface of the isolation plate (102) is provided with fixing holes, each fixing hole corresponding to the heating bladder (201) at the corresponding position. The ends of the heat transfer tube (107) and the heat conduction tube (104) that are far apart from each other are inserted and fixed in the corresponding fixing holes.
3. The multifunctional overhead cable for power transmission according to claim 2, characterized in that: The heat transfer tube (107) and the heat conduction tube (104) are each fixedly installed with a movable part (203) at one end close to each other. The two movable parts (203) are connected by a steering sleeve (202), and the steering sleeve (202) is respectively sleeved on the outer surface of the corresponding movable part (203).
4. The multifunctional overhead cable for power transmission according to claim 3, characterized in that: The heat transfer tube (107) consists of two interconnected tube sections. The two heat transfer tube sections (107) are connected by a central tube (204). Two backflow plugs (205) are movably installed inside the central tube (204). A connecting ring (207) is fixedly installed at the end of each of the two backflow plugs (205) that are close to each other. The two connecting rings (207) are connected by multiple shape memory metal sheets (206). The multiple shape memory metal sheets (206) are distributed circumferentially along the connecting rings (207) and arranged in a ring shape.
5. A multifunctional overhead cable for power transmission according to claim 4, characterized in that: The sidewall of the central tube (204) has multiple rectangular holes. Each memory metal sheet (206) has an arc-shaped structure and extends through the corresponding rectangular hole into the interior of the heating bladder (201). The interior of the heating bladder (201) is filled with insulating heat-conducting oil. The interior of the heat transfer tube (107) and the heat conduction tube (104) is provided with a circulation tube (108).
6. A multifunctional overhead cable for power transmission according to claim 5, characterized in that: The circulation tube (108) passes through the inside of the backflow plug (205). The two connecting rings (207) are fixedly installed with heat conduction frames (208) on the side that is close to each other. The heat conduction frames (208) are fixedly connected to the corresponding memory metal sheets (206) respectively, and the heat conduction frames (208) and the outer surface of the heat conduction tube (104) maintain sliding contact.
7. A multifunctional overhead cable for power transmission according to claim 6, characterized in that: The backflow plug (205) has a flow guide groove (209) on the side away from the connecting ring (207). The flow guide groove (209) is located inside the heat transfer tube (107). A sealing ring is fixedly installed at one end of the heat transfer tube (107) near the backflow plug (205). The sealing ring slides and seals with the outer surface of the backflow plug (205).
8. A multifunctional overhead cable for power transmission according to claim 7, characterized in that: A connecting sleeve (106) is provided between the heat-conducting pipe (104) and the adjacent set of heat transfer pipes (107). A connecting sleeve (210) is movably installed inside the heat-conducting pipe (104) and the heat transfer pipe (107). The inner wall of the connecting sleeve (106) is threadedly connected to the outer surface of the two connecting sleeves (210).