An ultra-high voltage cable having an aluminum sheath

Abstract

The application discloses a super-high-voltage cable with an aluminum sheath, and relates to the technical field of cables, which comprises an outer sheath, a cable core is arranged in the outer sheath, an insulating shielding sleeve is sleeved on the outer wall of the cable core, an inner sleeve is sleeved on the outer side of the insulating shielding sleeve, reinforcing belts are symmetrically wound on the outer wall of the inner sleeve, a plurality of arc pads are arranged on the outer side of the reinforcing belts at equal angles in the circumferential direction, and a supporting sleeve is sleeved on the outer side of the arc pads. The application effectively combines spiral limiting, multi-dimensional gradient buffering, flexible protection and rigid support, forms a multiple radial and axial force relief network, realizes multi-stage dispersion of stress, realizes efficient buffering of mechanical stress, provides reliable flexible protection for the super-high-voltage cable, forms a radial main heat conduction network and an inner-outer multiple axial auxiliary heat conduction network while ensuring mechanical strength, effectively improves the heat dissipation capacity of the cable, and can meet the requirements of the cable on mechanical strength and heat dissipation performance.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to an ultra-high voltage cable with a pressed aluminum sheath. Background Technology

[0002] Ultra-high voltage power transmission technology is a key means to achieve large-scale optimization of energy allocation and a core component of the national energy strategy. my country's power system is undergoing a profound transformation from traditional fossil energy to new energy. As a cross-regional, high-capacity, and low-loss energy transmission channel, the ultra-high voltage power grid is becoming increasingly important. As a hub device of the ultra-high voltage power transmission system, ultra-high voltage cables undertake the important task of transmitting electricity from large energy bases in the distance to load centers. However, current ultra-high voltage cables lack effective stress relief and enhancement mechanisms. To meet mechanical strength requirements, protective materials need to be stacked to resist external pressure. This not only affects the heat dissipation requirements of ultra-high voltage cables, but also separates the thermal field and mechanical stress field, resulting in a large design margin, making the cables bulky and cumbersome. Their synergy cannot be guaranteed, and stress concentration and local overheating are likely to occur. It is impossible to effectively balance the mechanical strength and heat dissipation performance requirements of ultra-high voltage cables. Summary of the Invention

[0003] This invention provides an ultra-high voltage cable with a pressed aluminum sheath, which can effectively solve the problem mentioned in the background art. Due to the lack of an effective stress relief and enhancement mechanism, current ultra-high voltage cables require stacking protective materials to resist external pressure in order to meet mechanical strength requirements. This not only affects the heat dissipation requirements of the ultra-high voltage cable, but also leads to a large design margin, resulting in a bulky and cumbersome cable. The synergy between the two cannot be guaranteed, and stress concentration and local overheating are likely to occur. It is impossible to effectively meet the requirements of ultra-high voltage cables for both mechanical strength and heat dissipation performance.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an ultra-high voltage cable with an aluminum-pressed sheath, comprising an outer sheath, a cable core installed inside the outer sheath, an insulating shield sleeve fitted onto the outer wall of the cable core, and a bidirectional reinforcement mechanism installed on the outside of the insulating shield sleeve; The bidirectional enhancement mechanism includes an inner nest; The insulating shielding sleeve is fitted with an inner nest on the outside. The outer wall of the inner nest is symmetrically wrapped with a reinforcing strip. Several arc pads are installed at equal angles along the circumferential direction on the outside of the reinforcing strip. A support sleeve is fitted on the outside of the arc pads. Several spacers are installed at equal angles along the circumferential direction on the inner wall of the support sleeve. Several concave arc plates are fitted evenly at equal intervals on the outside of the support sleeve. Both ends of the concave arc plates are equipped with ring ribs. A clamping pad is installed on the outer wall of the support sleeve at the position of the ring rib gap. Several insertion tubes are installed at equal angles along the circumferential direction on the side end face of the clamping pad. Straps are inserted inside the insertion tubes. A retaining ring is installed on the outer wall of the ring rib. A ring plate is sleeved at the end of the retaining ring. A convex ring and a concave ring are respectively installed at both ends of the ring plate and the retaining ring. A convex rib is installed on the outer wall of the ring plate.

[0005] Preferably, the outer wall of the insulating shielding sleeve is provided with a plurality of retaining rings at equal intervals, and the inner wall of the inner nest is provided with a retaining groove at the position of the retaining rings. The insulating shielding sleeve is formed by co-extrusion of a semi-conductive conductor shielding sleeve, a cross-linked polyethylene insulating sleeve in the middle and a semi-conductive cross-linked polymer sleeve on the outside through a three-layer co-extrusion technology.

[0006] Preferably, the reinforcing strip has two layers, and the two layers of reinforcing strip are wound in a reverse spiral manner. The spacer divides the inner cavity of the support sleeve into several inner grooves and arc grooves at equal angles along the circumferential direction, and the inner grooves and arc grooves are distributed adjacent to each other. The inner grooves are filled with non-Newtonian fluid. The arc pad is embedded and installed inside the arc groove, and the arc pad is filled with nitrogen gas. The inner side of the concave arc plate and the arc groove are filled with thermal grease at the position outside the arc pad.

[0007] Preferably, the insertion tube penetrates the clamping pad, and both ends of the insertion tube are connected to the annular ribs on both sides respectively. The concave arc plate, annular ribs, retaining ring, and annular plate are all made of aluminum, and the cavity formed by the concave arc plate, annular ribs, retaining ring, and annular plate is interconnected through the insertion tube.

[0008] Preferably, the convex ring and the concave ring fit together, and the outer sheath, the convex ring and the concave ring are all made of high-density polyethylene (HDPE) material. The outer sheath is connected to the ring plate through convex ribs.

[0009] Preferably, the outer sheath is equipped with a double-end protective mechanism at its end; The dual-end protective mechanism includes a front cover; The outer sheath is equipped with a front cover and a rear cover at both ends. A support plate is installed inside the front cover and the rear cover. An arc tube is installed on the side end of the support plate at the position corresponding to the arc pad. A sealing tube is installed on the side end of the support plate at the position corresponding to the inner groove. A cable sleeve is installed on the side end of the support plate at the position corresponding to the cable strip. A locking sleeve is slidably installed in the middle of the side end of the support plate. A connecting tube is embedded and snapped into the end of the locking sleeve. An annular shell is installed on the other end face of the arc pad. An arc opening is provided on the side end face of the annular shell corresponding to the position of the arc tube. A guide hole is provided on the side end face of the annular shell corresponding to the position of the sealing tube. A partition is installed inside the annular shell between the arc opening and the guide hole. An arc plug is slidably installed inside the annular shell at the gap between the partitions. A conduit is installed at the end of the annular shell corresponding to the position of the arc plug. Piston rings are slidably installed inside the front and rear covers at the corresponding positions of the guide tubes. A sealing ring is slidably installed at the end of the rear cover. A gasket is installed at one end of the sealing ring. Several through holes are opened at equal angles along the circumference at the other end of the sealing ring located inside the rear cover. An annular groove is opened at the end of the front cover at the position corresponding to the gasket. Threaded rings are installed on the outer sides of the front and rear covers by threads. An inner through groove is opened on the inner wall of the front and rear covers at the position between the piston rings and the guide tubes.

[0010] Preferably, the arc tube can be inserted and connected to the arc pad, the sealing tube can be inserted and connected to the inner groove, the end of the cable sleeve is fixedly connected to the cable, and the outer curved surface of the front cover and the rear cover is embedded with a glue injection nozzle at the position between the support plate and the outer sheath, and the glue injection nozzle is connected to the space outside the arc tube, the sealing tube, the cable sleeve and the lock sleeve, and the connecting tube is a conductive metal tube.

[0011] Preferably, the chamber where the piston ring is located inside the rear cover is connected to the chamber where the sealing ring is located inside the rear cover. The chamber where the piston ring is located is connected to the chamber where the arc plug is located inside the ring shell through a conduit. The chamber inside the ring shell located on the other side of the arc plug is connected to the arc tube and the sealing tube through an arc opening and a guide hole, respectively. The chambers inside the ring shell that are connected to the arc tube and the sealing tube are separated by a partition.

[0012] Preferably, the gasket is connected to the chamber where the sealing ring is located through the through hole, the gasket fits into the ring groove, the internal thread of the threaded ring is a bidirectional thread, a liquid valve is embedded in the top of the outer curved surface of the front cover and the rear cover at the position corresponding to the inner through groove, and an air valve is embedded in the side end face of the front cover and the rear cover at the position corresponding to the piston ring.

[0013] Preferably, a limiting sleeve is embedded in the inner wall of the front cover and the rear cover at the position corresponding to the end of the outer sheath, and both the limiting sleeve and the ring gasket are elastic airbags. A bent hole is opened inside the front cover and the rear cover at the position corresponding to the limiting sleeve, and the limiting sleeve is connected to the space between the piston ring and the guide tube through the bent hole.

[0014] Compared with the prior art, the advantages of the present invention are: the present invention has a scientific and reasonable structure and is safe and convenient to use; 1. Equipped with a bidirectional reinforcement mechanism, the external metal composite protective structure can be formed by the combination of concave arc plates, ring ribs, retaining rings and ring plates, which simultaneously improves the mechanical strength and shielding performance of the cable. It can also be combined with clamps, tubes, cables, inner nests, reinforcing strips, arc pads, supports and spacers to form multiple axial and radial linkage conduction mechanisms. On the one hand, it can make full use of the bidirectional spiral limiting effect of the reinforcing strip, which can not only effectively resist deformation by generating reverse torque and slight angle changes, avoid excessive compression of the internal structure, balance radial pressure, and disperse axial tensile force, bending stress and torsional stress along the axial direction to achieve circumferential stress relief, but also form an axial spiral heat conduction network to quickly transfer the heat of local hot spots of the cable along the axial direction, balance the internal heat and improve the heat transfer efficiency. On the other hand, it can be combined with the inner groove and arc groove to make full use of the fluidity of non-Newtonian fluid and nitrogen to achieve multi-dimensional gradient buffering. It not only effectively utilizes the properties of non-Newtonian fluids to achieve dual-state stress relief, effectively dispersing radial and axial pressure dynamically, and simultaneously balancing the stress relief and buffering work of instantaneous impact force and chronic force, but also fully utilizes the compressibility of nitrogen to provide sufficient stress relief and buffering space for non-Newtonian fluids, forming a multi-gradient buffering stress relief mechanism to enhance stress relief and more efficiently remove external forces. At the same time, it can utilize the fluidity of nitrogen to form axial natural convection on the inner side of the arc pad, forming an internal auxiliary axial heat dissipation channel. With the connection effect of the tube, an external axial heat dissipation channel can be formed between the concave arc plate, ring rib, retaining ring, and ring plate. While ensuring the mechanical strength of the cable, it forms a multi-axial auxiliary heat conduction network inside and outside, and can fully utilize the heat transfer characteristics of thermal paste to promote rapid heat dissipation, greatly improving the effectiveness and uniformity of heat exchange, and effectively improving the heat dissipation capacity of the cable. Through the cooperation of convex rings, concave rings, convex ribs, retaining grooves, and retaining rings, the contact surface between the internal structures of the cable can be effectively expanded, improving heat transfer efficiency and increasing the internal density of the cable.

[0015] 2. Equipped with a double-end protection mechanism, the front cover, rear cover, and threaded ring work together to construct the end connection body, providing a stable connection protection space for the cable end and fully ensuring the stability of the joint. In addition, the limiting connection function of the support plate, arc tube, sealing tube, cable sleeve, and locking sleeve can effectively improve the fit between the cable end connection and the internal structure of the main body, improve the compatibility and stability between the bidirectional reinforcement mechanism and the double-end protection mechanism, effectively ensure the sealing of the internal structure of the cable, and make the cable's stress relief and heat dissipation work smoother and more reliable. At the same time, synchronous linkage can be achieved, which greatly enhances the stress relief balance and effectiveness between the joint and the internal structure of the main body, making the cable work more smoothly. By combining the ring shell, arc opening, guide hole, partition, arc plug, conduit, and piston ring, a connected stress-relief space can be constructed to achieve synchronous indirect transmission. This effectively balances the axial and radial pressures of non-Newtonian fluids and nitrogen inside the cable, and expands the effective stress-relief buffer space for non-Newtonian fluids, achieving circumferential linkage and further balancing and dispersing the pressure. In conjunction with connecting pipes, sealing rings, gaskets, through holes, ring grooves, inner through grooves, limiting sleeves, and bends, the pressure of non-Newtonian fluids and nitrogen inside the cable can be transformed into locking force. This simultaneously increases the connection stress between the components inside the double-end protection mechanism and the connection stress between the double-end protection mechanism and the cable body, and makes the connection stress rise and fall synchronously with the internal stress of the cable, further ensuring the connection effect at the cable connection point.

[0016] In summary, this cable effectively integrates helical limiting, multi-dimensional gradient buffering, flexible protection, and rigid support. It not only forms multiple radial and axial stress relief networks, achieving multi-level dispersion of radial pressure, axial tension, bending stress, and torsional stress, but also provides reliable flexibility protection for ultra-high voltage cables. Furthermore, while ensuring mechanical strength, it forms a radially dominant, multi-axial auxiliary heat conduction network, effectively improving the cable's heat dissipation capacity and simultaneously meeting the cable's requirements for both mechanical strength and heat dissipation performance. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the reinforcing strip mounting structure of the present invention; Figure 3 This is a schematic diagram of the arc pad mounting structure of the present invention; Figure 4 This is a schematic diagram of the cable core installation structure of the present invention; Figure 5 This is a schematic diagram of the bidirectional reinforcement mechanism of the present invention; Figure 6 This is a schematic diagram of the double-ended protection mechanism of the present invention; Figure 7 This is a schematic diagram of the sealing ring installation structure of the present invention; Figure 8 This is a schematic diagram of the arc plug mounting structure of the present invention; The diagram is labeled as follows: 1. Outer sheath; 11. Cable core; 12. Insulating shielding sleeve. 20. Bidirectional reinforcement mechanism; 201. Inner nesting; 202. Reinforcing strip; 203. Arc pad; 204. Support sleeve; 205. Spacing pad; 206. Concave arc plate; 207. Ring rib; 208. Clamping pad; 209. Inserted tube; 210. Cable; 211. Snap ring; 212. Ring plate; 213. Protruding ring; 214. Concave ring; 215. Protruding rib; 216. Snap groove; 217. Snap ring; 218. Inner groove; 219. Arc groove; 220. Non-Newtonian fluid; 30. Double-ended protective mechanism; 301. Front cover; 302. Rear cover; 303. Support plate; 304. Arc tube; 305. Sealing tube; 306. Cable sleeve; 307. Locking sleeve; 308. Connecting tube; 309. Ring shell; 310. Arc opening; 311. Guide hole; 312. Partition plate; 313. Arc plug; 314. Guide tube; 315. Piston ring; 316. Sealing ring; 317. Gasket; 318. Through hole; 319. Ring groove; 320. Threaded ring; 321. Internal through groove; 31. Injection nozzle; 32. Liquid valve; 33. Air valve; 34. Limiting sleeve; 35. Bend. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] Example: Figure 1-8 As shown, the present invention provides a technical solution, an ultra-high voltage cable with an aluminum sheath, including an outer sheath 1, a cable core 11 installed inside the outer sheath 1, an insulating shielding sleeve 12 sleeved on the outer wall of the cable core 11, and a bidirectional reinforcement mechanism 20 installed on the outside of the insulating shielding sleeve 12. The bidirectional enhancement mechanism 20 includes an inner nest 201; An inner nest 201 is sleeved on the outside of the insulating shielding sleeve 12. A reinforcing strip 202 is symmetrically wound on the outer wall of the inner nest 201. Several arc pads 203 are installed at equal angles along the circumferential direction on the outer side of the reinforcing strip 202. A support sleeve 204 is sleeved on the outer side of the arc pads 203. Several spacers 205 are installed at equal angles along the circumferential direction on the inner wall of the support sleeve 204. Several concave arc plates 206 are uniformly sleeved on the outer side of the support sleeve 204 at equal intervals. Both ends of the concave arc plates 206 are equipped with ring ribs 207. A clamping pad 208 is installed on the outer wall of the support sleeve 204 at the gap position of the ring ribs 207. Several insertion tubes 209 are installed at equal angles along the circumferential direction on the side end face of the clamping pad 208. Cables 210 are inserted inside the insertion tubes 209. A retaining ring 211 is installed on the outer wall of the annular rib 207. An annular plate 212 is sleeved at the end of the retaining ring 211. The insertion tubes 209 penetrate the clamping pad 208, and both ends of the insertion tubes 209 are connected to the annular ribs 207 on both sides. The concave arc plate 206, annular ribs 207, retaining rings 211, and annular plate 212 are all made of aluminum. The cavity formed by the ring plate 212 and the ring 213 is interconnected by the insertion tube 209 to achieve multi-channel heat exchange. The ring plate 212 and the retaining ring 211 are respectively equipped with a convex ring 213 and a concave ring 214 at both ends. The outer wall of the ring plate 212 is equipped with a convex rib 215. The convex ring 213 and the concave ring 214 fit together. The outer sheath 1, the convex ring 213 and the concave ring 214 are all made of high-density polyethylene (HDPE). The outer sheath 1 is connected to the ring plate 212 through the convex rib 215 to provide stable limiting protection.

[0021] The outer wall of the insulating shielding sleeve 12 is evenly provided with several retaining rings 217 at equal intervals. The inner wall of the inner nest 201 is provided with a retaining groove 216 at the position of the retaining rings 217. The retaining groove 216 is a one-way groove structure. The retaining rings 217 fit into the retaining groove 216. The insulating shielding sleeve 12 is formed by co-extrusion of a semi-conductive conductor shielding sheath, a cross-linked polyethylene insulating sheath in the middle and a semi-conductive cross-linked polymer sheath on the outside through a three-layer co-extrusion technology to improve the internal structural stability of the cable and ensure its insulation shielding performance. The reinforcing strip 202 has two layers, and the two layers of reinforcing strip 202 are wound in a reverse spiral manner. The spacer 205 divides the inner cavity of the support 204 into several inner grooves 218 and arc grooves 219 at equal angles along the circumference. The inner grooves 218 and arc grooves 219 are distributed adjacent to each other. The inner grooves 218 are filled with non-Newtonian fluid 220. The arc pad 203 is embedded and installed inside the arc groove 219, and the arc pad 203 is filled with nitrogen. The inner side of the concave arc plate 206 and the arc groove 219 are filled with thermal grease at the position outside the arc pad 203 to construct a stress relief and heat exchange auxiliary network to coordinate stress relief and heat exchange.

[0022] The outer sheath 1 is equipped with a double-end protective mechanism 30 at one end; The dual-end protective mechanism 30 includes a front cover 301; The outer sheath 1 has a front cover 301 and a rear cover 302 installed at both ends. Both the front cover 301 and the rear cover 302 have support plates 303 installed inside. An arc tube 304 is installed on the side end of the support plate 303 at the position corresponding to the arc pad 203. A sealing tube 305 is installed on the side end of the support plate 303 at the position corresponding to the inner groove 218. A cable sleeve 306 is installed on the side end of the support plate 303 at the position corresponding to the cable strip 210. A locking sleeve 307 is slidably embedded in the middle of the side end face of the support plate 303, with its end embedded in a snap-fit ​​mechanism. There is a connecting pipe 308, an arc pipe 304 that can be inserted into the arc pad 203, a sealing pipe 305 that can be inserted into the inner groove 218, and a cable sleeve 306 whose end is fixedly connected to the cable 210. The outer curved surfaces of the front cover 301 and the rear cover 302 are embedded with glue injection nozzles 31 at the position between the support plate 303 and the outer sheath 1. The glue injection nozzles 31 are connected to the space outside the arc pipe 304, the sealing pipe 305, the cable sleeve 306 and the locking sleeve 307. The connecting pipe 308 is a conductive metal pipe to improve the connection stability. An annular shell 309 is installed on the other end face of the arc pad 203. An arc opening 310 is opened on the side end face of the annular shell 309 corresponding to the position of the arc tube 304. A guide hole 311 is opened on the side end face of the annular shell 309 corresponding to the position of the sealing tube 305. A partition 312 is installed inside the annular shell 309 between the arc opening 310 and the guide hole 311. An arc plug 313 is slidably installed inside the annular shell 309 at the gap position of the partition 312. A conduit 314 is installed at the end of the annular shell 309 corresponding to the position of the arc plug 313. Piston rings 315 are slidably installed inside the front cover 301 and the rear cover 302 at the positions corresponding to the conduit 314. The chamber where the piston ring 315 is located inside the rear cover 302 is connected to the chamber where the sealing ring 316 is located inside the rear cover 302. The chamber where the piston ring 315 is located is connected to the chamber where the arc plug 313 is located inside the ring shell 309 through the conduit 314. The chamber inside the ring shell 309 located on the other side of the arc plug 313 is connected to the arc tube 304 and the sealing tube 305 through the arc opening 310 and the guide hole 311, respectively. The chamber inside the ring shell 309 connected to the arc tube 304 and the sealing tube 305 is separated by the partition 312 to achieve linkage unloading and pressure balance. A sealing ring 316 is slidably installed at the end of the rear cover 302. A gasket 317 is installed at one end of the sealing ring 316. A limiting sleeve 34 is embedded in the inner wall of the front cover 301 and the rear cover 302 at the position corresponding to the end of the outer sleeve 1. Both the limiting sleeve 34 and the gasket 317 are elastic airbags. A bent hole 35 is opened inside the front cover 301 and the rear cover 302 at the position corresponding to the limiting sleeve 34. The limiting sleeve 34 is connected to the space between the piston ring 315 and the guide tube 314 through the bent hole 35 to improve the connection stability. Several through holes 318 are opened at equal angles along the circumference at the other end of the sealing ring 316 located inside the rear cover 302. An annular groove 319 is provided at the end of the front cover 301 corresponding to the position of the gasket 317. Threaded rings 320 are installed on the outer sides of the front cover 301 and the rear cover 302 via threads. Inner through grooves 321 are provided on the inner walls of the front cover 301 and the rear cover 302 at the position between the piston ring 315 and the guide tube 314. The gasket 317 is connected to the chamber where the sealing ring 316 is located through the through hole 318. The gasket 317 fits into the annular groove 319. The internal thread of the threaded ring 320 is a bidirectional thread. A liquid valve 32 is embedded at the top of the outer curved surface of the front cover 301 and the rear cover 302 corresponding to the position of the inner through groove 321. An air valve 33 is embedded at the side end face of the front cover 301 and the rear cover 302 corresponding to the position of the piston ring 315, for installation and maintenance.

[0023] The working principle and usage process of this invention: During the production process of this ultra-high voltage cable, the bidirectional reinforcement mechanism 20, the double-end protection mechanism 30, the outer sheath 1, the cable core 11, and the insulating shielding sleeve 12 can be produced independently. After production is completed, the bidirectional reinforcement mechanism 20 is fitted on the outside of the insulating shielding sleeve 12, so that the slot 216 and the retaining ring 217 are engaged, and the double-end protection mechanism 30 is installed at both ends of the bidirectional reinforcement mechanism 20. When in use, according to the actual needs of the cable, select the appropriate number of cables according to the length of a single cable, pull and transport the cable to the installation position, use the double-end protection mechanism 30 to connect each cable in series, and after connecting the cable ends to the corresponding external equipment, it can be put into use. During the cable laying process, nitrogen gas is first injected into the chamber where the piston ring 315 is located inside the front cover 301 and the rear cover 302 through the corresponding gas valve 33. This provides elastic support to the piston ring 315, giving the cable the ability to unload stress during use and balancing the connection stress at the joint. Nitrogen gas is injected by default during the cable production process. During the cable laying and installation process, this step can be ignored unless there is a special requirement to change the gas type. After ensuring that the gas valve 33 is intact, the next connection work can be carried out directly. Next, the cable cores 11 of the two cables are passed through the locking sleeve 307 and their ends are inserted into the connecting tube 308. Using an external crimping device, the ends of the two cable cores 11 are crimped with the connecting tube 308, and the locking sleeve 307 is clamped on the outside of the reinforcing strip 202. The arc tube 304 is aligned with the arc pad 203 and inserted into the arc pad 203. The sealing tube 305 is aligned with the inner groove 218 and inserted into the inner groove 218. The cable strip 210 is then fixedly connected to the locking sleeve 307 in sequence, while the limiting sleeve 34 is engaged with the outer sheath 1. Then, align the sealing ring 316 with the ring groove 319, insert the ring washer 317 into the ring groove 319, and align the front cover 301 and the rear cover 302 with the threaded ring 320. Rotate the threaded ring 320 to screw the ends of the front cover 301 and the rear cover 302 into the threaded ring 320, completing the initial connection of the two cables. Next, inject sealant into the injection nozzle 31. The sealant will pass through the injection nozzle 31 and enter the space where the outer arc tube 304, the sealing tube 305 and the cable sleeve 306 of the locking sleeve 307 are located for auxiliary connection and sealing, ensuring sealing and connection firmness. It should be noted that the aforementioned process is only required when the installation of the front cover 301 and the rear cover 302 at the cable end is not completed. This process can be completed before cable laying to ensure that the sealant is fully cured. Under normal circumstances, when the cable leaves the factory, it is assumed that the installation of the front cover 301 and the rear cover 302 at both ends of the cable and the sealant application have been completed, and the connecting tube 308 is embedded and snapped into the locking sleeve 307 on one side of the rear cover 302. During the cable laying process, it is only necessary to insert the cable core 11 at one end of the front cover 301 of the other cable into the connecting tube 308, and after the crimping work is completed, the front cover 301 and the rear cover 302 can be locked by the threaded ring 320. Next, insulating silicone grease is injected into the liquid valve 32. The insulating silicone grease will pass through the liquid valve 32 and simultaneously enter the space where the sealing ring 316 and piston ring 315 are located, and pass through the inner through groove 321 to enter the space where the connecting pipe 308 is located, filling the gap between the connecting pipe 308 and the front cover 301 and the rear cover 302. At the same time, with the through hole 318 connected, the insulating silicone grease will pass through the through hole 318 and enter the gasket 317. The gasket 317 will expand accordingly under its compression, pressing the ring groove 319 and making it fit more stably with the ring groove 319, thus improving the sealing performance. With the connection of the bend 35, the insulating silicone grease will enter the limiting sleeve 34 through the bend 35, causing the limiting sleeve 34 to expand accordingly, and more stably hold the outer sheath 1. With the auxiliary connection effect of the sealant, the connection between the outer sheath 1 and the front cover 301 and the rear cover 302 can be more stable and firm, and the sealing performance at this time can be improved simultaneously. At the same time, with the connection of the conduit 314, the insulating silicone grease will flow into the chambers where the arc plugs 313 are located inside the ring shell 309, providing support for the arc plugs 313. During the aforementioned process, the piston ring 315 is subjected to compression from nitrogen gas on the other side in real time. Under the pressure of nitrogen gas, while the insulating silicone grease is compressing the piston ring 315, the piston ring 315 will provide the insulating silicone grease with a reverse elastic compression force. In the process of the insulating silicone grease flowing, it will transform the elastic compression force provided by nitrogen gas into the supporting force of the ring gasket 317, the limiting sleeve gasket 34 and each arc plug 313, thereby achieving flexible support. With the arc tube 304 connected, the nitrogen gas inside the arc pad 203 will pass through the arc opening 310 along the arc tube 304 and enter the chamber where the arc plug 313 is located, squeezing the other end face of the arc plug 313. With the sealing tube 305 connected, the non-Newtonian fluid 220 inside the arc groove 219 will pass through the guide hole 311 along the sealing tube 305 and enter the chamber where the arc plug 313 is located, squeezing the other end face of the arc plug 313. Finally, the forces of the nitrogen gas inside the arc pad 203 and the non-Newtonian fluid 220 inside the arc groove 219 will be transmitted to the insulating silicone grease through the arc plug 313, indirectly realizing the synchronous transmission of pressure. Finally, after the cable is connected to the external electrical equipment, it can be put into use. During the use of the cable, when the cable is subjected to external radial pressure such as soil pressure and tunnel construction pressure, the hollow structure formed by the concave arc plate 206, ring rib 207, snap ring 211 and ring plate 212 will be squeezed first, and it will undergo elastic deformation accordingly to absorb part of the pressure and perform initial stress relief and buffering. Simultaneously, the clamping pad 208, the convex ring 213, and the concave ring 214 will also deform accordingly to make room and buffer, and ensure the tightness of the cable's interior. Subsequently, the sleeve 204 will be synchronously squeezed, and the non-Newtonian fluid 220 inside the arc groove 219 will flow under its compression, dispersing the pressure to the entire circumference for further stress relief. Under the compression of the non-Newtonian fluid 220, the diaphragm 205 will also deform accordingly, squeezing the arc pad 203 inside the arc groove 219. The arc pad 203 will be compressed accordingly, providing sufficient stress relief buffer space for the non-Newtonian fluid 220, while allowing the nitrogen inside to absorb a large amount of energy, achieving linkage pressure relief. Subsequently, the spiral skeleton composed of two layers of reinforcing strips 202 will be compressed, which will resist deformation, prevent excessive compression of the inner nest 201, and finally relieve most of the pressure, achieving multi-level protection for the cable core 11, and dispersing the pressure to avoid pressure concentration and make the force evenly distributed. During cable use, when subjected to bending stress and axial tensile stress, the cable 210 will be stretched accordingly. Under the stretching, the concave arc plate 206, ring rib 207 and clamp 208 will deform accordingly to resist the stress. At the same time, the two layers of reinforcing tape 202 wrapped in the opposite direction will change their winding angle accordingly. The arc pad 203 will also deform elastically under the tension, squeezing the nitrogen inside. The non-Newtonian fluid 220 inside the arc groove 219 will also be compressed and flow, further dissipating bending and tensile energy and reducing the impact of bending stress and tensile stress on the cable. Similarly, when the cable is subjected to torsional stress, the angle of the two layers of reverse-wound reinforcing strips 202 will change accordingly, which will generate reverse torque to offset part of the torsional stress. At the same time, the arc pad 203, the sleeve 204 and the diaphragm 205 will also generate corresponding torsion, so that the nitrogen gas and non-Newtonian fluid 220 are synchronously squeezed, and the stress is dispersed during its flow. It should be noted that the radial pressure, bending stress, axial tensile stress and torsional stress mentioned in the above process are all chronic forces. At this time, the non-Newtonian fluid 220 behaves as a fluid, maintaining the flexibility of the sleeve 204 and the spacer 205. When the cable encounters a sudden and violent impact, the non-Newtonian fluid will harden instantly, dispersing the impact force to a larger area. It also provides auxiliary support to the hollow structure formed by the concave arc plate 206, ring rib 207, retaining ring 211 and ring plate 212 through the sleeve 204 and the spacer 205, locking the internal cable core 11 and preventing it from being subjected to hard impact, thus achieving dual-state protection. Regardless of whether the cable is subjected to radial pressure, bending stress, axial tensile stress, or external torsion, the non-Newtonian fluid 220 and nitrogen gas inside it will be impacted and flow accordingly. As mentioned in the previous process, the force of the non-Newtonian fluid 220 and nitrogen gas will be transmitted to the insulating silicone grease through the arc plug 313. That is, when the cable is subjected to radial pressure, bending stress, axial tensile stress, and torsional stress, this force will be transmitted to the insulating silicone grease simultaneously. As a result, the insulating silicone grease will flow, which on the one hand will squeeze the piston ring 315 and compress the nitrogen on the other side of the piston ring 315 for further linkage and stress relief, and on the other hand will increase the pressure on the ring gasket 317 and the limiting sleeve gasket 34 to ensure the stability of the joint. At the same time, since the piston ring 315 and each arc plug 313 are connected by the conduit 314, the pressure of the nitrogen inside each arc gasket 203 and the pressure of the non-Newtonian fluid 220 inside the inner groove 218 can be further dispersed and balanced, so as to balance the radial and axial forces on the cable. It should be added that during the use of the cable, the bidirectional reinforcement mechanism 20 not only has multi-directional axial and radial stress relief and buffering functions, but the two layers of reverse-wound reinforcement tape 202 can form an axial spiral heat conduction network, which can quickly transfer the heat of the local hot spots of the cable along the axial direction. The nitrogen gas inside the arc pad 203 will naturally convect along the axial direction, forming an internal auxiliary axial heat dissipation channel, and can cooperate with the thermal paste on its outer side to transfer the heat to the concave arc plate 206 in the radial direction. The hollow structure formed by the concave arc plate 206, ring rib 207, retaining ring 211, and ring plate 212 has internal cavities that are interconnected through the insertion tube 209, forming an outer axial heat dissipation channel. This allows the heat transferred to the concave arc plate 206 to dissipate axially outward along the cavity. In addition, the support provided by the non-Newtonian fluid 220 and nitrogen gas makes the interfaces inside the cable fit better. The presence of thermal paste can effectively reduce the interface thermal resistance, forming a radially dominant and multi-axially assisted heat conduction network, thereby improving the heat dissipation capacity of the cable.

[0024] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An ultra-high voltage cable with an aluminum-clad sheath, comprising an outer sheath (1), characterized in that: The outer sheath (1) is equipped with a cable core (11), and an insulating shield (12) is sleeved on the outer wall of the cable core (11). A bidirectional reinforcement mechanism (20) is installed on the outside of the insulating shield (12). The bidirectional enhancement mechanism (20) includes an inner nest (201); The insulating shielding sleeve (12) is fitted with an inner nest (201) on the outside. The outer wall of the inner nest (201) is symmetrically wrapped with a reinforcing strip (202). A number of arc pads (203) are installed at equal angles along the circumferential direction on the outer side of the reinforcing strip (202). A support sleeve (204) is fitted on the outer side of the arc pads (203). A number of spacers (205) are installed at equal angles along the circumferential direction on the inner wall of the support sleeve (204). A number of concave arc plates (206) are uniformly fitted on the outer side of the support sleeve (204). A ring rib (207) is installed at both ends of the concave arc plate (206). A clamping pad (208) is installed on the outer wall of the support sleeve (204) at the gap position of the ring rib (207). The side end face of the clamping pad (208) is equipped with several insertion tubes (209) at equal angles along the circumferential direction. The insertion tubes (209) are filled with ropes (210). The outer wall of the ring rib (207) is equipped with a retaining ring (211). The end of the retaining ring (211) is sleeved with a ring plate (212). The two ends of the ring plate (212) and the retaining ring (211) are respectively equipped with a convex ring (213) and a concave ring (214). The outer wall of the ring plate (212) is equipped with a convex rib (215).

2. The ultra-high voltage cable with an aluminum-pressed sheath according to claim 1, characterized in that, The outer wall of the insulating shielding sleeve (12) is provided with a number of retaining rings (217) evenly spaced. The inner wall of the inner nest (201) is provided with a retaining groove (216) at the position of the retaining rings (217). The insulating shielding sleeve (12) is formed by co-extrusion of an inner semi-conductive conductor shielding sleeve, a middle cross-linked polyethylene insulating sleeve and an outer semi-conductive cross-linked polymer sleeve through a three-layer co-extrusion technology.

3. The ultra-high voltage cable with an aluminum-clad sheath according to claim 1, characterized in that, The reinforcing strip (202) has two layers, and the two layers of the reinforcing strip (202) are wound in a reverse spiral manner. The spacer (205) divides the inner cavity of the support (204) into several inner grooves (218) and arc grooves (219) at equal angles along the circumference. The inner grooves (218) and arc grooves (219) are distributed adjacent to each other. The inner grooves (218) are filled with non-Newtonian fluid (220). The arc pads (203) are embedded and installed inside the arc grooves (219), and the arc pads (203) are filled with nitrogen. The inner side of the concave arc plate (206) and the inner side of the arc grooves (219) are filled with thermal paste at the position outside the arc pads (203).

4. The ultra-high voltage cable with an aluminum-pressed sheath according to claim 1, characterized in that, The insertion tube (209) passes through the clamping pad (208), and both ends of the insertion tube (209) are connected to the annular ribs (207) on both sides respectively. The concave arc plate (206), annular ribs (207), retaining ring (211) and annular plate (212) are all made of aluminum, and the cavity formed by the concave arc plate (206), annular ribs (207), retaining ring (211) and annular plate (212) is interconnected through the insertion tube (209).

5. The ultra-high voltage cable with an aluminum-pressed sheath according to claim 1, characterized in that, The convex ring (213) and concave ring (214) fit together, and the outer sheath (1), convex ring (213) and concave ring (214) are all made of high-density polyethylene material. The outer sheath (1) is connected to the ring plate (212) through the convex rib (215).

6. The ultra-high voltage cable with an aluminum-pressed sheath according to claim 3, characterized in that, The outer sheath (1) is equipped with a double-end protection mechanism (30) at its end. The dual-end protective mechanism (30) includes a front cover (301); The outer sheath (1) is equipped with a front cover (301) and a rear cover (302) at both ends. A support plate (303) is installed inside the front cover (301) and the rear cover (302). An arc tube (304) is installed on the side end of the support plate (303) at the position corresponding to the arc pad (203). A sealing tube (305) is installed on the side end of the support plate (303) at the position corresponding to the inner groove (218). A cable sleeve (306) is installed on the side end of the support plate (303) at the position corresponding to the cable strip (210). A locking sleeve (307) is slidably installed in the middle of the side end of the support plate (303). A connecting tube (308) is embedded and snapped into the end of the locking sleeve (307). An annular shell (309) is installed on the other end face of the arc pad (203). An arc opening (310) is opened on the side end face of the annular shell (309) corresponding to the position of the arc tube (304). A guide hole (311) is opened on the side end face of the annular shell (309) corresponding to the position of the sealing tube (305). A partition plate (312) is installed inside the annular shell (309) between the arc opening (310) and the guide hole (311). An arc plug (313) is slidably installed inside the annular shell (309) at the gap position of the partition plate (312). A conduit (314) is installed at the end of the annular shell (309) corresponding to the position of the arc plug (313). Piston rings (315) are slidably installed inside the front cover (301) and the rear cover (302) at the positions corresponding to the conduit (314). A sealing ring (316) is slidably installed at the end of the rear cover (302). A gasket (317) is installed at one end of the sealing ring (316). Several through holes (318) are opened at equal angles along the circumference at the other end of the sealing ring (316) inside the rear cover (302). An annular groove (319) is opened at the end of the front cover (301) at the position corresponding to the gasket (317). Threaded rings (320) are installed on the outer side of the front cover (301) and the rear cover (302) by threads. An inner through groove (321) is opened on the inner wall of the front cover (301) and the rear cover (302) at the position between the piston ring (315) and the conduit (314).

7. The ultra-high voltage cable with an aluminum-pressed sheath according to claim 6, characterized in that, The arc tube (304) can be inserted and connected to the arc pad (203), the sealing tube (305) can be inserted and connected to the inner groove (218), the end of the cable sleeve (306) is fixedly connected to the cable (210), the outer curved surface of the front cover (301) and the rear cover (302) is embedded with a glue injection nozzle (31) at the position between the support plate (303) and the outer sheath (1), and the glue injection nozzle (31) is connected to the space outside the arc tube (304), the sealing tube (305), the cable sleeve (306) and the lock sleeve (307), and the connecting tube (308) is a conductive metal tube.

8. The ultra-high voltage cable with an aluminum-pressed sheath according to claim 6, characterized in that, The chamber containing the piston ring (315) inside the rear cover (302) is connected to the chamber containing the sealing ring (316) inside the rear cover (302). The chamber containing the piston ring (315) is connected to the chamber containing the arc plug (313) inside the ring shell (309) through the conduit (314). The chamber inside the ring shell (309) located on the other side of the arc plug (313) is connected to the arc tube (304) and the sealing tube (305) through the arc opening (310) and the guide hole (311), respectively. The chamber inside the ring shell (309) connected to the arc tube (304) and the sealing tube (305) is separated by the partition plate (312).

9. A high-voltage cable with an aluminum-clad sheath according to claim 6, characterized in that, The gasket (317) is connected to the chamber where the sealing ring (316) is located through the through hole (318). The gasket (317) fits into the ring groove (319). The internal thread of the threaded ring (320) is a bidirectional thread. Liquid valves (32) are embedded in the top of the outer curved surface of the front cover (301) and the rear cover (302) at the position corresponding to the inner through groove (321). Gas valves (33) are embedded in the side end face of the front cover (301) and the rear cover (302) at the position corresponding to the piston ring (315).

10. A high-voltage cable with an aluminum-clad sheath according to claim 6, characterized in that, The front cover (301) and the rear cover (302) are fitted with a limiting sleeve (34) at the end of the outer sleeve (1) on their inner walls. The limiting sleeve (34) and the ring gasket (317) are both elastic airbags. The front cover (301) and the rear cover (302) are provided with a bent hole (35) at the position of the limiting sleeve (34). The limiting sleeve (34) is connected to the space between the piston ring (315) and the guide tube (314) through the bent hole (35).

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