Multifunctional medium-voltage cable for power transmission

Abstract

The invention discloses a multifunctional medium-voltage cable for power transmission, and relates to the technical field of cables, the outer side end of a transmission wire core is sleeved with an inner special-shaped insulation sleeve, a plurality of power connection processing strips are embedded into the outer side end of the inner special-shaped insulation sleeve at equal intervals, and the outer side ends of the inner special-shaped insulation sleeve and the power connection processing strips are sleeved with a central insulation sleeve; according to the invention, the external staggered heat insulation strips are utilized to reduce the influence of the external environment on the interior of the cable, and at the same time, the stable heat dissipation of the interior of the cable is ensured, so that the service life of the cable is prolonged, and the service life of the cable is prolonged. Therefore, when the cable runs, the situation that the internal temperature change is too large or too high due to the fact that the heat conduction part cannot be automatically adjusted can be avoided, the situation that the insulation part of the cable is accelerated to age due to continuous thermal expansion and cold contraction or excessive heating is reduced, the running stability of the cable is improved, and the service life of the cable is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable, in particular to a multifunctional medium-voltage cable for power transmission. BACKGROUND

[0002] Medium-voltage cable is a key component in power transmission, widely used in urban power grid, industrial power supply and renewable energy projects, usually refers to power cable with rated voltage between 1kV and 35kV, common grades: 6kV, 10kV, 35kV in China, 3.3kV, 6.6kV, 11kV, 33kV internationally, multifunctional medium-voltage cable is a composite cable integrating multiple additional functions on the basis of traditional medium-voltage cable, aiming to meet the comprehensive needs of power transmission, data communication, environmental monitoring, safety protection and other comprehensive needs, suitable for smart grid, industry 4.0 and smart city and other complex scenes.

[0003] However, the existing medium-voltage cable is used in low temperature environment, because the cable does not set adjustable heat conduction component inside, when directly insulated, it will cause the internal temperature to be too high, without isolation, the internal temperature of the cable changes continuously, affecting the stability of its operation, and the insulation sleeve of the cable will accelerate aging under the continuous cold and hot action, affecting the service life of the cable. SUMMARY

[0004] The present application provides a multifunctional medium-voltage cable for power transmission, which can effectively solve the problem of the existing medium-voltage cable in the above background technology, which is used in low temperature environment, because the cable does not set adjustable heat conduction component inside, when directly insulated, it will cause the internal temperature to be too high, without isolation, the internal temperature of the cable changes continuously, affecting the stability of its operation, and the insulation sleeve of the cable will accelerate aging under the continuous cold and hot action, affecting the service life of the cable.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a multifunctional medium-voltage cable for power transmission, comprising a transmission line core, the transmission line core is provided with an inner and outer protective component at the side end; The inner and outer protective component comprises an inner insulation sleeve; The transmission line core is sleeved with an inner insulation sleeve at the outer side end, a plurality of power connection treatment strips are embedded and installed at the outer side end of the inner insulation sleeve, and a center insulation sleeve is sleeved with the outer side end of the inner insulation sleeve and the power connection treatment strip; A plurality of inner protective shielding strips are wound equidistantly outside the center insulation sleeve, a hard buffer strip is laid outside the outer side end of the plurality of inner protective shielding strips, and a plurality of heat exchange relay cavities are equidistantly formed inside the hard buffer strip; A plurality of elastic contact sheets are embedded and installed equidistantly outside the outer side end of the hard buffer strip, and a middle limiting strip is laid outside the outer side end of the plurality of elastic contact sheets; The heat exchange relay cavity is internally sleeved with a sponge pad, and the middle limiting strip is externally connected with a hollow partition elastic sleeve.

[0006] According to the technical scheme, the transmission line core has three, the inner diameter of the center insulation sleeve is equal to the outer diameter of the inner insulation sleeve, and the side ends of two adjacent hard buffer strips are attached to each other.

[0007] According to the technical scheme, the hollow partition elastic sleeve is externally connected with a contact heat insulation strip, and the outer ends of the hollow partition elastic sleeve and the contact heat insulation strip are externally laid with a heat conduction matching sleeve. The side ends of the heat conduction matching sleeves are externally connected with a special-shaped insulation filling strip, one end of the special-shaped insulation filling strip is externally connected with a plurality of embedded limiting holes, and a reinforcing positioning rib is inserted into the embedded limiting holes. The special-shaped insulation filling strips are externally connected with an isolation insulation sleeve, the inner end of the isolation insulation sleeve is externally laid with a staggered heat insulation strip, and the inner side of the isolation insulation sleeve is externally provided with a soft pad reset sleeve. The inner side of the soft pad reset sleeve is externally connected with a transmission optical fiber, the inner side of the special-shaped insulation filling strip is externally connected with a plurality of independent reset cavities, the inner side of the independent reset cavities is externally connected with a buffer porous shrinkage block, and the side ends of the buffer porous shrinkage block are externally connected with a plurality of hard alignment pieces.

[0008] According to the technical scheme, the outer ends of the special-shaped insulation filling strips are externally connected with a plurality of outer limit shielding strips, the outer ends of the outer limit shielding strips are externally laid with a staggered heat insulation strip, the outer ends of the staggered heat insulation strips are externally laid with an outer limit insulation sleeve, and a plurality of anti-piercing elastic pieces are externally embedded into the inner side of the outer limit insulation sleeve. The inner side of the elastic contact piece is inserted into the inner side of the heat exchange relay cavity, the side end of the contact heat insulation strip is slidably attached to the outer side of the hard buffer strip and the elastic contact piece, and the longitudinal section of the contact heat insulation strip is in the shape of a.

[0009] According to the technical scheme, the staggered heat insulation strip and the soft pad reset sleeve each have two layers, the outer side of the hard alignment piece is connected to one end of the inner side of the independent reset cavity, and the staggered heat insulation strip and the anti-piercing elastic piece each have two layers.

[0010] According to the technical scheme, the reinforcing positioning rib has nine, the special-shaped insulation filling strip has three, the longitudinal sections of the electrically connected processing strip, the inner protective shielding strip, the hard buffer strip, the elastic contact piece, the middle limiting strip, the sponge pad, the hollow partition elastic sleeve, the porous heat absorbing pad, the staggered heat insulation strip, the hard alignment piece, the outer limit shielding strip, the staggered heat insulation strip, and the anti-piercing elastic piece are all in the shape of an arc.

[0011] According to the above technical solution, an isolation assembly is provided at the outer end of the outer limiting insulating sleeve; The isolation assembly includes a connecting adhesive pad; The outer insulating sleeve is symmetrically bonded with connecting adhesive pads at equal intervals in the middle. A semi-circular threaded ring is bonded to the outer end of the connecting adhesive pad. A threaded integrated ring is connected to the side end of the semi-circular threaded ring through a thread. The two threaded integrated rings are connected by a retaining bolt. The side end of the threaded integrated ring is connected to a double-threaded flexible bellows by a thread. The inner side of the double-threaded flexible bellows is symmetrically bonded with honeycomb load-bearing plates. Both ends of the outer limit insulating sleeve are bonded with limit bonding rings, and the side ends of the limit bonding rings are bonded with perforated sleeve caps. One end of the multi-hole sleeve cap is rotatably connected to an internal thread limiting ring, and the inner end of the internal thread limiting ring is connected to an external thread limiting cap via a thread. One end of the external thread limiting cover is welded with a dividing limiting tube at the position corresponding to the multi-hole sleeve cover, and a number of wire-passing limiting holes are equally spaced on one end of the external thread limiting cover.

[0012] According to the above technical solution, the two adjacent semi-circular threaded rings are fitted together, the two threaded integrated rings are hinged together, and there are two of each of the double-threaded flexible bellows and the multi-hole sleeve cap.

[0013] According to the above technical solution, the side end of the double-threaded flexible corrugated pipe is attached to the side end of the semi-circular threaded ring, the two honeycomb load-bearing pieces slide against each other, and the side end of the honeycomb load-bearing piece slides against the outer end of the outer limiting insulating sleeve.

[0014] According to the above technical solution, the multi-hole sleeve cover is fitted and connected to the external thread limiting cover, and the partition limiting tube is fitted and combined with the multi-hole sleeve cover.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Equipped with an inner and outer protective assembly, the rigid buffer strip is heat-conducted through an inner insulating sleeve, a central insulating sleeve, and an inner protective shielding strip. The internal absorbent sponge pad and its filling heat-conducting fluid absorb heat, which evaporates to form steam. This steam, along with the elastic contact piece, transfers heat to the central limiting strip and the hollow separator elastic sleeve, reaching the porous heat-absorbing pad. Here, the heat-conducting fluid again generates steam, causing the hollow separator elastic sleeve to expand bidirectionally, pulling the contact insulation strip and changing the contact area between the hollow separator elastic sleeve and the elastic contact piece. Adjusting the heat-conducting components and their positions alters the area and speed of heat transfer. This, combined with heat-conducting sleeves and shaped insulating fillers, increases the heat-conducting area. External staggered insulation strips further reduce the impact of the external environment on the cable's interior, ensuring stable internal heat dissipation. This prevents excessive internal temperature fluctuations or overheating due to the heat-conducting components' inability to adjust themselves during cable operation. It also reduces the accelerated aging of the cable's insulation components caused by continuous thermal expansion and contraction or excessive heating, improving the cable's operational stability and extending its service life.

[0016] 2. The transmission core is double-isolated using an inner insulating sleeve and a central insulating sleeve. This, combined with a connection treatment strip, enables insulation protection and leakage detection. A staggered heat-insulating strip provides heat insulation to the optical fiber, reducing the risk of bending due to continuous high temperatures and ensuring stable operation. A soft-pad reset sleeve and an insulating sleeve provide elastic support to the optical fiber, minimizing bending amplitude and impacting its operation during minor cable bends. A shaped insulating filler strip, a porous buffer shrinkage block, and a rigid alignment plate provide independent limiting support and elastic shrinkage at the outer end, ensuring stable load-bearing isolation at the outer end. This shrinkage treatment enhances the cable's ability to withstand stress and maintain stability at all internal locations.

[0017] 3. Through internal multi-position synchronous heat conduction, multi-point contact heat conduction, and continuous change of heat conduction liquid-gas-liquid phase, thermal expansion and contraction change the transfer area. Combined with external multi-segment buffer support and telescopic limit coordination, the stability of multi-position operation can be guaranteed during cable operation. It avoids the situation where the components are deformed due to internal compression of the cable, which would prevent normal operation. It effectively solves the problem that the existing technology does not have self-adjustable heat conduction components inside the cable, which affects the heat dissipation and heat preservation effect of the cable. This makes the cable prone to switching between hot and cold environments, causing the cable to be continuously affected by thermal expansion and contraction, resulting in insulation aging. It also reduces the occurrence of internal insulation layer damage under pressure, ensuring the stability of cable operation and the service life of the cable.

[0018] 4. An isolation assembly is provided. A semi-circular threaded ring is bonded to the side of the outer limiting insulation sleeve via an adhesive pad. The double-threaded flexible corrugated tube and honeycomb load-bearing plate are also attached to the side of the outer limiting insulation sleeve. Two threaded integrated rings are secured in place using limiting bolts. The threaded integrated rings, semi-circular threaded rings, and double-threaded flexible corrugated tube are connected together, thus fixing the double-threaded flexible corrugated tube to the side of the outer limiting insulation sleeve. When the cable bends, the different deformations of the two sections of the double-threaded flexible corrugated tube, combined with the staggered sliding of the two honeycomb load-bearing plates, isolate and protect the outer limiting insulation sleeve at the cable bend, achieving stable cable isolation at the limiting point. To prevent insulation thinning at bends due to stretching, a multi-hole sleeve cap is bonded to the side of the outer insulating sleeve using a fixed-limit adhesive ring. The transmission core and optical fiber are then passed through the isolation limiting tube. The electrical connection strip is attached to the side of the isolation limiting tube. The threaded inner thread limiting ring and outer thread limiting cap are then connected and fixed to each other to achieve connection positioning. This isolates the transmission core, electrical connection strip, and optical fiber, ensuring stable electrical connection separation. Through bend limiting protection and edge electrical connection separation protection, the insulation effect and stability of the cable are improved, achieving cable operation protection and extending the protection effect and cable service life.

[0019] In summary, by cooperating with the internal and external protective components and the isolation combination components, and utilizing multi-segment thermal conduction switching, pressure isolation limitation, pressure shrinkage support, and multi-segment isolation protection, the cable can effectively achieve elastic support and stable operation with thermal insulation during cable laying and operation, thereby improving the stability of the cable's self-protection. At the same time, by utilizing fiber optic transmission and leakage contact in conjunction with cable operation, internal self-measurement, data transmission, and external elastic support are achieved, enhancing the functionality and application range of the cable during power transmission, while ensuring the stability of cable operation and extending the cable's service life. Attached Figure Description

[0020] 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.

[0021] In the attached diagram: Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the inner and outer protective components of the present invention; Figure 3 This is a schematic diagram of the installation structure of the thermally conductive mating sleeve of the present invention; Figure 4 This is a schematic diagram of the installation structure of the misaligned insulation strip of the present invention; Figure 5 This is a schematic diagram of the installation structure of the rigid buffer strip of the present invention; Figure 6This is a schematic diagram of the installation structure of the central insulating sleeve of the present invention; Figure 7 This is a schematic diagram of the installation structure of the absorbent sponge pad of the present invention; Figure 8 This is a schematic diagram of the structure of the isolation assembly of the present invention; Figure 9 This is a schematic diagram of the installation structure of the semi-circular threaded ring of the present invention; Figure 10 This is a schematic diagram of the installation structure of the finite adhesive ring of the present invention; Labels in the diagram: 1. Transmission wire core; 2. Inner and outer protective components; 201. Inner insulating sleeve; 202. Electrical connection strip; 203. Center insulating sleeve; 204. Inner protective shielding strip; 205. Rigid buffer strip; 206. Heat exchange relay cavity; 207. Elastic contact piece; 208. Center limiting strip; 209. Absorbent sponge pad; 210. Hollow-filled elastic sleeve; 211. Porous heat-absorbing pad; 212. Contact heat insulation strip; 213. Thermally conductive mating sleeve; 14. Irregularly shaped insulating filler strip; 215. Embedded limiting hole; 216. Reinforcing positioning rib; 217. Isolating insulating sleeve; 218. Misaligned heat insulation strip; 219. Soft pad reset sleeve; 220. Transmission optical fiber; 221. Independent reset cavity; 222. Buffer porous shrink block; 223. Rigid alignment piece; 224. External limiting shielding strip; 225. Misaligned heat insulation strip; 226. External limiting insulating sleeve; 227. Puncture-resistant elastic sheet; 3. Isolation assembly; 301. Connecting adhesive pad; 302. Semi-circular threaded ring; 303. Threaded integrated ring; 304. Restricting bolt; 305. Double-threaded flexible corrugated pipe; 306. Honeycomb load-bearing sheet; 307. Fixed-limit adhesive ring; 308. Multi-hole sleeve cap; 309. Internal threaded limiting ring; 310. External threaded limiting cap; 311. Dividing limiting tube; 312. Wire threading limiting hole. Detailed Implementation

[0022] 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.

[0023] Example: Figures 1-10 As shown, the present invention provides a technical solution, a multifunctional medium-voltage cable for power transmission, including a transmission core 1, which has three cores to achieve stable power transmission. An inner and outer sheath assembly 2 is provided on the side of the transmission core 1. The inner outer protective assembly 2 includes an inner insulating sleeve 201, a power connection strip 202, a central insulating sleeve 203, an inner protective shielding strip 204, a rigid buffer strip 205, a heat exchange relay cavity 206, an elastic contact piece 207, a central limiting positioning strip 208, an absorbent sponge pad 209, a hollow separating elastic sleeve 210, a porous heat-absorbing pad 211, a contact heat insulation strip 212, a thermally conductive mating sleeve 213, a shaped insulating filling strip 214, an embedded limiting hole 215, a reinforcing positioning rib 216, an isolation insulating sleeve 217, a misaligned heat insulation strip 218, a soft pad reset sleeve 219, a transmission optical fiber 220, an independent reset cavity 221, a buffer porous shrink block 222, a rigid alignment piece 223, an outer limiting shielding strip 224, a misaligned heat insulation strip 225, an outer limiting insulating sleeve 226, and a puncture-resistant elastic piece 227. An inner insulating sleeve 201 is sleeved on the outer end of the transmission line core 1. Several electrical connection strips 202 are equidistantly embedded on the outer end of the inner insulating sleeve 201. A central insulating sleeve 203 is sleeved on the outer end of the inner insulating sleeve 201 and the electrical connection strips 202. The inner diameter of the central insulating sleeve 203 is equal to the outer diameter of the inner insulating sleeve 201, so as to achieve a stable double-layer insulation treatment and avoid leakage that could cause external overheating and fire. The outer side of the central insulating sleeve 203 is wrapped with several inner protective shielding strips 204 at equal intervals. The outer ends of the multiple inner protective shielding strips 204 are covered with rigid buffer strips 205. The side ends of two adjacent rigid buffer strips 205 are attached to each other to achieve stable positioning and restriction, and ensure internal heat conduction. Several heat exchange relay cavities 206 are opened at equal intervals on the inner side of the rigid buffer strips 205. Several elastic contact pieces 207 are equidistantly embedded at the outer end of the rigid buffer strip 205, and a middle limiting strip 208 is laid at the outer end of the multiple elastic contact pieces 207. A foam pad 209 is fitted inside the bottom of the heat exchange relay cavity 206, and a hollow elastic sleeve 210 is bonded to the outer end of the middle limiting positioning strip 208. Several porous heat-absorbing pads 211 are equidistantly sleeved on the inner side of the hollow partition elastic sleeve 210. Contact heat insulation strips 212 are symmetrically bonded to the outer end of the hollow partition elastic sleeve 210. The inner bottom end of the elastic contact piece 207 is inserted and installed inside the heat exchange relay cavity 206. The side end of the contact heat insulation strip 212 slides and fits with the rigid buffer strip 205 and the outer end of the elastic contact piece 207 to achieve internal and external alignment heat exchange treatment and linkage isolation treatment, ensuring the stability of temperature control. The longitudinal section of the contact heat insulation strip 212 is U-shaped to achieve steady extension and movement, ensuring the stability of contact heat dissipation and heat conduction. Thermally conductive mating sleeves 213 are laid on the outer ends of multiple hollow partition elastic sleeves 210 and contact heat insulation strips 212. Two thermally conductive mating sleeves 213 are bonded to the side ends with irregularly shaped insulating filler strips 214. Several embedded limiting holes 215 are equally spaced on one end of the irregularly shaped insulating filler strips 214. Reinforcing positioning ribs 216 are inserted and installed inside the embedded limiting holes 215. There are nine reinforcing positioning ribs 216 and three irregularly shaped insulating filler strips 214, which realizes external positioning limitation and positioning isolation, and ensures the stability of support limit and bending limitation. A multiple irregularly shaped insulating filler strips 214 are bonded together with an insulating sleeve 217. The inner end of the insulating sleeve 217 is equidistantly laid with staggered heat insulation strips 218, and the inner side of the insulating sleeve 217 is equidistantly provided with soft pad reset sleeves 219. The soft reset sleeve 219 has a transmission optical fiber 220 sleeved inside. Both the misaligned heat insulation strip 218 and the soft reset sleeve 219 have two layers, which can isolate and protect the internal transmission optical fiber 220. This allows the transmission optical fiber 220 to be heat-insulated and elastically limited during long-term use of the cable, preventing the transmission optical fiber 220 from bending due to compression and high temperature. The irregular insulating filler strip 214 has several independent reset cavities 221 equidistantly opened inside. The independent reset cavities 221 are bonded to the inside of the independent reset cavities 222. Several hard alignment pieces 223 are bonded to the side of the buffer porous shrink block 222 at equal intervals. The outer end of the hard alignment piece 223 is bonded to one end of the independent reset cavity 221 to achieve internal alignment and locking, increase the contact heat conduction area, and improve the stability of heat conduction separation. Multiple irregularly shaped insulating filler strips 214 are equidistantly bonded with several outer limiting shielding strips 224 at their outer ends. The outer ends of the multiple outer limiting shielding strips 224 are covered with staggered heat insulation strips 225, and the outer ends of the multiple staggered heat insulation strips 225 are covered with outer limiting insulating sleeves 226. Several anti-puncture elastic sheets 227 are equidistantly embedded inside the outer limiting insulating sleeves 226. Both the staggered heat insulation strips 225 and the anti-puncture elastic sheets 227 have two layers, achieving protection, isolation, and heat insulation limitation. The longitudinal sections of the electrical connection strip 202, inner protective shielding strip 204, rigid buffer strip 205, elastic contact sheet 207, middle limiting positioning strip 208, absorbent sponge pad 209, hollow separating elastic sleeve 210, porous heat-absorbing pad 211, staggered heat insulation strip 218, rigid alignment sheet 223, outer limiting shielding strip 224, staggered heat insulation strip 225, and anti-puncture elastic sheet 227 are all arc-shaped to ensure the stability of the overall fit.

[0024] An isolation assembly 3 is provided on the outer end of the outer limiting insulating sleeve 226; The isolation assembly 3 includes a connecting adhesive pad 301, a semi-circular threaded ring 302, a threaded integrated ring 303, a limiting bolt 304, a double-threaded flexible corrugated tube 305, a honeycomb load-bearing sheet 306, a fixed-limit adhesive ring 307, a multi-hole sleeve cover 308, an internal thread limiting ring 309, an external thread limiting cover 310, a partition limiting tube 311, and a wire-passing limiting hole 312; The outer insulating sleeve 226 has symmetrically bonded connecting adhesive pads 301 at equal intervals in the middle. A semi-circular threaded ring 302 is bonded to the outer end of the connecting adhesive pad 301. The side ends of two adjacent semi-circular threaded rings 302 are fitted together to achieve alignment support and alignment engagement. The side ends of the semi-circular threaded rings 302 are connected to threaded integrated rings 303 by threads. The two threaded integrated rings 303 are hinged together to achieve the engagement and restriction connection of the threaded integrated rings 303. Two threaded integrated rings 303 are snapped together by limiting bolts 304. The side end of the threaded integrated ring 303 is connected to a double-threaded flexible bellows 305 by threads. The side end of the double-threaded flexible bellows 305 is attached to the side end of the semi-circular threaded ring 302 to achieve sealing and isolation. Honeycomb load-bearing plates 306 are symmetrically bonded to the inner side of the double-threaded flexible bellows 305. The two honeycomb load-bearing plates 306 slide against each other. The side end of the honeycomb load-bearing plate 306 slides against the outer end of the outer limiting insulating sleeve 226 to ensure the stability of load-bearing limitation and buffer contact. Both ends of the outer insulating sleeve 226 are bonded with limiting adhesive rings 307. The side ends of the limiting adhesive rings 307 are bonded with multi-hole sleeve caps 308. There are two double-threaded flexible corrugated pipes 305 and two multi-hole sleeve caps 308 to ensure isolation and limitation at the bends and both ends, and to ensure the stability of the laying. One end of the multi-hole sleeve cover 308 is rotatably connected to an internal thread limiting ring 309, and the inner end of the internal thread limiting ring 309 is connected to an external thread limiting cover 310 by a thread. One end of the external thread limiting cover 310 is welded with a partition limiting tube 311 at the position corresponding to the multi-hole sleeve cover 308. The multi-hole sleeve cover 308 and the external thread limiting cover 310 are fitted together. The partition limiting tube 311 and the multi-hole sleeve cover 308 are fitted together to realize multi-segment fitting isolation and fitting protection, ensuring the isolation and limitation of the transmission line core 1. One end of the external thread limiting cover 310 is provided with several wire-passing limiting holes 312 at equal intervals.

[0025] The working principle and usage process of this invention are as follows: When laying medium-voltage cables, workers guide the cables along the laying route. Adhesive is used to attach the connecting adhesive pad 301 to the bending position of the outer insulating sleeve 226. The connecting adhesive pad 301 is used to attach the semi-circular threaded ring 302 to the side end of the outer insulating sleeve 226. The double-threaded flexible corrugated tube 305 is attached to the outer end of the outer insulating sleeve 226, ensuring that both ends of the double-threaded flexible corrugated tube 305 are attached to the side end of the semi-circular threaded ring 302. The honeycomb load-bearing plate 306 is attached to the side end of the outer insulating sleeve 226. The threaded-to-thread integrated ring 303 is fitted onto the side end of the outer insulating sleeve 226. The limiting bolt 304 is used to lock and restrict the two threaded integrated rings 303, thus achieving positioning and restriction of the two threaded integrated rings 303. At this time, the rotating threaded integrated ring 303, the threaded integrated ring 303, the semi-circular threaded ring 302 and the double-threaded flexible corrugated tube 305 are combined and connected to fix the double-threaded flexible corrugated tube 305 to the side of the outer limiting insulation sleeve 226. At this time, the cable bending pushes the double-threaded flexible corrugated tube 305 on one side to be stretched and the double-threaded flexible corrugated tube 305 on the other side to be compressed. At the same time, the two honeycomb load-bearing plates 306 slide in a staggered manner to isolate and protect the outer limiting insulation sleeve 226 at the cable bending point, realize the cable stable isolation and limiting treatment, and avoid the insulation from thinning at the bending point due to stretching and bending. Using adhesive, the fixed-limit adhesive ring 307 is fixed to the outer ends of the outer limiting insulating sleeve 226. The fixed-limit adhesive ring 307 is used to bond the multi-hole sleeve cover 308, and the inner end of the multi-hole sleeve cover 308 is attached to the side end of the outer limiting insulating sleeve 226. The transmission core 1 and the transmission optical fiber 220 are passed through the isolation limiting tube 311. The power connection strip 202 is attached to the side end of the isolation limiting tube 311. The connection line of the external detection device is connected to the power connection strip 202 and passed through the wire limit hole 312. At this time, the internal thread limiting ring 309 is rotated, and the internal thread limiting ring 309 and the external thread limiting cover 310 are connected and fixed to each other by the thread to achieve connection positioning. The transmission core 1, the power connection strip 202 and the transmission optical fiber 220 are isolated to achieve steady power connection separation. During installation, the outer insulating sleeve 226 contacts the side of the installation location. At this time, the cable's own weight causes the shaped insulating filler strip 214 to deform under stress, with varying deformation at different locations. The buffer porous shrinkage block 222 within the independent reset cavity 221 deforms, shrinks, and folds. Simultaneously, the rigid alignment piece 223 provides load-bearing support at the stress points, achieving elastic shrinkage and load-bearing limitation at multiple locations. Simultaneously, the multiple shaped insulating filler strips 214 internally compress each other, achieving stable buffering, reducing direct compression at the internal transmission core 1, decreasing the deformation degree of each power transmission component, and improving its stability during operation. When medium-voltage cables are used, power transmission is carried out through three transmission cores 1. At this time, the transmission cores 1 generate heat due to their own resistance. The heat is conducted through the inner insulating sleeve 201 and the central insulating sleeve 203. During cable operation, the inner insulating sleeve 201 provides insulation and isolation for the transmission cores 1. At the same time, the current-connecting strip 202 conducts electricity to the inner insulating sleeve 201. At this time, the external micro-current detection device detects the current of the current-connecting strip 202, so as to accurately and quickly understand the actual situation inside the cable when the inner insulating sleeve 201 ages, cracks, or is damaged by heat due to continuous heating during long-term use. The inner shielding strip 204 isolates and shields the internal transmission core 1, and together with the inner insulating sleeve 201 and the central insulating sleeve 203, provides double-layer isolation protection to achieve internal interference shielding. At this time, the internal heat is conducted outward to the position of the rigid buffer strip 205, and the heat is transferred to the inside of the heat exchange relay cavity 206, where it conducts heat to the absorbent sponge pad 209 that has absorbed the heat conduction fluid. The heat conduction fluid and the absorbent sponge pad 209 absorb heat, and the heat conduction fluid is slowly evaporated to form hot vapor. The main component of the heat conduction fluid is perfluoropolyether, which is a low molecular weight synthetic fluorinated liquid with an evaporation temperature of 80℃. The operating temperature of the cable is between 60℃ and 90℃, so it can be steadily heated and evaporated during heat conduction. The hot vapor diffuses to the inner end of the elastic contact piece 207. When the hot vapor comes into contact with the elastic contact piece 207, the heat of the hot vapor decreases, forming condensate, which flows back. At the position of the absorbent sponge pad 209, liquid recycling and reuse are achieved. Heat is transferred to the inside of the hollow partition elastic sleeve 210 through the elastic contact piece 207 and the central limiting strip 208. At this time, the porous heat-absorbing pad 211 inside absorbs the heat, repeating the above steps of slow evaporation of the heat conduction liquid to achieve heat outward. When the heat conduction liquid is heated to form hot steam, the hot steam pushes the hollow partition elastic sleeve 210 to expand outward and inward at the same time. The expanded hollow partition elastic sleeve 210 pulls the contact heat insulation strip 212 to move along the elastic contact piece 207, changing the contact surface between the elastic contact piece 207 and the hollow partition elastic sleeve 210, changing the internal heat conduction speed. By using the two-stage liquid heat absorption and contact heat conduction treatment, internal heat balance treatment and heat residue treatment are achieved, stabilizing the internal temperature and avoiding the internal temperature being greatly affected by the external environment, thus preventing the occurrence of internal temperature instability. Internal heat is transferred outward along the heat-conducting sleeve 213 to the location of the shaped insulating filler strip 214. The shaped insulating filler strip 214 increases the outward heat conduction area, achieving heat dispersion and improving heat dissipation stability. The reinforcing positioning rib 216 embedded in the limiting hole 215 supports and positions the inner end of the shaped insulating filler strip 214, thereby restricting the positioning of the insulating sleeve 217. At this time, the misaligned heat insulation strip 218 provides heat insulation treatment for both the inside and outside, and the soft pad reset sleeve 219 provides elastic buffering for the transmission optical fiber 220. This allows the transmission optical fiber 220 to reduce the bending amplitude when bending slightly, improving the stability of the transmission optical fiber 220 operation, reducing the impact of cable bending and continuous high temperature on the transmission optical fiber 220, and using the outer limiting shielding strip 224 to isolate and shield multiple sets of transmission cores 1 internally and externally, reducing the impact of external signals and electromagnetic fields on the internal cores, using the staggered heat insulation strip 225 to provide heat insulation treatment for both internal and external parts, and using the anti-puncture elastic sheet 227 to strengthen the limiting, reducing the damage of the external environment to the cable insulation layer, and improving the stability and safety of cable operation.

[0026] 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. A multifunctional medium-voltage cable for power transmission, comprising a transmission core (1), characterized in that: The transmission line core (1) is provided with an inner and outer protective assembly (2) on its side. The inner outer protective assembly (2) includes an inner insulating sleeve (201); The outer end of the transmission line core (1) is fitted with an inner insulating sleeve (201), and a plurality of power-connecting strips (202) are equidistantly embedded in the outer end of the inner insulating sleeve (201). The outer ends of the inner insulating sleeve (201) and the power-connecting strips (202) are fitted with a central insulating sleeve (203). The outer side of the central insulating sleeve (203) is wrapped with several inner protective shielding strips (204) at equal intervals. The outer ends of the multiple inner protective shielding strips (204) are covered with rigid buffer strips (205). Several heat exchange relay cavities (206) are opened at equal intervals on the inner side of the rigid buffer strips (205). The rigid buffer strip (205) has several elastic contact pieces (207) equidistantly embedded at its outer end, and the outer ends of the multiple elastic contact pieces (207) are covered with a central limiting strip (208). The bottom inner side of the heat exchange relay cavity (206) is fitted with an absorbent sponge pad (209), and the outer end of the middle limiting positioning strip (208) is bonded with a hollow dividing elastic sleeve (210). The inner side of the hollow dividing elastic sleeve (210) is fitted with several porous heat-absorbing pads (211) at equal intervals.

2. The multifunctional medium-voltage cable for power transmission according to claim 1, characterized in that, The transmission line core (1) has three cores. The inner diameter of the central insulating sleeve (203) is equal to the outer diameter of the inner insulating sleeve (201). The two adjacent hard buffer strips (205) are attached to each other.

3. The multifunctional medium-voltage cable for power transmission according to claim 1, characterized in that, The outer ends of the hollow partition elastic sleeve (210) are symmetrically bonded with contact heat insulation strips (212), and the outer ends of the multiple hollow partition elastic sleeves (210) and contact heat insulation strips (212) are covered with heat-conducting mating sleeves (213). Two thermally conductive mating sleeves (213) are bonded with irregularly shaped insulating filler strips (214) at their side ends. Several embedded limiting holes (215) are equally spaced at one end of the irregularly shaped insulating filler strips (214). Reinforcing positioning ribs (216) are inserted and installed inside the embedded limiting holes (215). An insulating sleeve (217) is bonded between multiple irregular insulating filler strips (214). The inner end of the insulating sleeve (217) is provided with staggered heat insulation strips (218) at equal intervals. The inner side of the insulating sleeve (217) is provided with soft pad reset sleeves (219) at equal intervals. The soft pad reset sleeve (219) is fitted with a transmission optical fiber (220) on its inner side. The irregular insulating filler strip (214) has several independent reset cavities (221) equidistantly opened on its inner side. The independent reset cavity (221) is bonded with a buffer porous shrink block (222) on its inner side. The buffer porous shrink block (222) is bonded with several hard alignment pieces (223) equidistantly on its side end.

4. The multifunctional medium-voltage cable for power transmission according to claim 3, characterized in that, A plurality of outer limiting shielding strips (224) are equidistantly bonded to the outer ends of the plurality of irregularly shaped insulating filler strips (214), staggered heat insulation strips (225) are laid on the outer ends of the plurality of outer limiting shielding strips (224), and outer limiting insulating sleeves (226) are laid on the outer ends of the plurality of staggered heat insulation strips (225). A plurality of anti-puncture elastic sheets (227) are equidistantly embedded in the inner side of the outer limiting insulating sleeves (226). The inner bottom end of the elastic contact piece (207) is inserted and installed inside the heat exchange relay cavity (206). The side end of the contact heat insulation strip (212) slides and fits against the outer end of the rigid buffer strip (205) and the elastic contact piece (207). The longitudinal section of the contact heat insulation strip (212) is U-shaped.

5. A multifunctional medium-voltage cable for power transmission according to claim 4, characterized in that, The misaligned heat insulation strip (218) and the soft pad reset sleeve (219) both have two layers. The outer end of the hard alignment piece (223) is bonded to one end of the inner side of the independent reset cavity (221). The misaligned heat insulation strip (225) and the anti-puncture elastic piece (227) both have two layers.

6. A multifunctional medium-voltage cable for power transmission according to claim 4, characterized in that, There are nine reinforcing positioning ribs (216), three irregular insulating filling strips (214), and the longitudinal sections of the electrical connection strip (202), inner protective shielding strip (204), rigid buffer strip (205), elastic contact piece (207), middle limiting positioning strip (208), absorbent sponge pad (209), hollow separating elastic sleeve (210), porous heat-absorbing pad (211), misaligned heat insulation strip (218), rigid alignment piece (223), outer limiting shielding strip (224), misaligned heat insulation strip (225) and puncture-resistant elastic piece (227) are all arc-shaped.

7. A multifunctional medium-voltage cable for power transmission according to claim 4, characterized in that, An isolation assembly (3) is provided on the outer end of the outer limiting insulating sleeve (226); The isolation assembly (3) includes a connecting adhesive pad (301); The outer insulating sleeve (226) is symmetrically bonded with connecting adhesive pads (301) at equal intervals in the middle. A semi-circular threaded ring (302) is bonded to the outer end of the connecting adhesive pad (301). A threaded integrated ring (303) is threadedly connected to the side end of the semi-circular threaded ring (302). The two threaded integrated rings (303) are snapped together by a limiting bolt (304). The side end of the threaded integrated ring (303) is connected to a double-threaded flexible bellows (305) by a thread. The inner side of the double-threaded flexible bellows (305) is symmetrically bonded with honeycomb load-bearing plates (306). Both ends of the outer limit insulating sleeve (226) are bonded with limit bonding rings (307), and the side ends of the limit bonding rings (307) are bonded with perforated sleeve caps (308). One end of the multi-hole sleeve cap (308) is rotatably connected to an internal thread limiting ring (309), and the inner end of the internal thread limiting ring (309) is connected to an external thread limiting cap (310) by a thread. One end of the external thread limiting cover (310) is welded with a dividing limiting tube (311) at the position corresponding to the multi-hole sleeve cover (308), and a number of wire-passing limiting holes (312) are equally spaced on one end of the external thread limiting cover (310).

8. A multifunctional medium-voltage cable for power transmission according to claim 7, characterized in that, The two adjacent semicircular threaded rings (302) are fitted together at their sides, the two threaded integrated rings (303) are hinged together, and there are two of each of the double-threaded flexible bellows (305) and the multi-hole sleeve cap (308).

9. A multifunctional medium-voltage cable for power transmission according to claim 7, characterized in that, The side end of the double-threaded flexible corrugated pipe (305) is attached to the side end of the semi-circular threaded ring (302), the two honeycomb load-bearing pieces (306) slide against each other, and the side end of the honeycomb load-bearing piece (306) slides against the outer end of the outer limiting insulating sleeve (226).

10. A multifunctional medium-voltage cable for power transmission according to claim 7, characterized in that, The multi-hole sleeve cap (308) is fitted and connected to the external thread limiting cap (310), and the partition limiting tube (311) is fitted and combined with the multi-hole sleeve cap (308).

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