Corrosion-resistant and anti-aging long-life medium voltage cable

Abstract

This invention discloses a corrosion-resistant and anti-aging long-life medium-voltage cable, relating to the field of cable technology. Multiple intermediate-limit insulating tubes are equidistantly arranged on the inner side of the outer water-blocking insulating tube. Several inner-limiting armored sheets are equidistantly laid on the inner ends of these intermediate-limiting insulating tubes. An outer thermally conductive elastic correction pad is bonded to the inner side of each inner-limiting armored sheet. Several inner semi-conductive sheets are equidistantly clamped to the outer ends of the conductive cores. A flame-retardant elastic sleeve is bonded to the outer ends of several metal shielding strips. A heat-dissipating guide clip is laid on the outer end of the flame-retardant elastic sleeve. This invention utilizes compression to prevent gaps from forming due to differences in the thermal expansion coefficients of components during thermal expansion and contraction. This reduces the rate of thermal aging of internal components and the size of gaps between external components, thereby reducing cable breakdown damage caused by aging and gap ionization, and improving the cable's anti-aging effect and operational stability.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a corrosion-resistant and aging-resistant long-life medium-voltage cable. Background Technology

[0002] Medium-voltage cables are power cables used for distributing electrical energy. Their core function is to efficiently and safely transmit and distribute electrical energy. They are mainly used in urban underground power grids, power plant outgoing lines, and internal power supply in industrial and mining enterprises. Their voltage levels typically range from 3kV to 35kV. Medium-voltage cables consist of a conductor, conductor shield, insulation layer, insulation shield, metal shield layer, filler and wrapping tape, inner lining layer, armor layer, and outer sheath. Cross-linked polyethylene insulated cables have changed from thermoplastic materials to thermosetting materials, resulting in significant improvements in heat resistance, mechanical strength, and electrical performance. They are also widely used in medium-voltage cables.

[0003] However, when existing medium-voltage cables are used in urban power grids, they are affected by peak and off-peak electricity, resulting in uneven load intensity. This leads to uneven heating of the cable cores during operation. However, the cable's thermal conductivity and thermal conductivity area are fixed, and the thermal expansion coefficients of different cable components are different. This causes the cable components to switch back and forth between compression and separation during operation, resulting in cable component fatigue, thermal aging and separation. This leads to gap ionization and aging ionization breakdown inside the cable, which greatly affects the actual service life of the cable. Summary of the Invention

[0004] This invention provides a corrosion-resistant and aging-resistant long-life medium-voltage cable, which can effectively solve the problem mentioned in the background art: uneven load strength of the cable leads to uneven heating of the battery core during cable operation. However, the cable's thermal conductivity and thermal conductivity area are fixed, and the thermal expansion coefficients of various cable components are different. This causes the cable components to switch back and forth between compression and separation during operation, resulting in cable component fatigue, thermal aging and separation. This leads to gap ionization and aging ionization breakdown inside the cable, which greatly affects the actual service life of the cable.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a corrosion-resistant and aging-resistant long-life medium-voltage cable, comprising an outer water-blocking insulating tube, wherein a plurality of conductive cores are arranged inside the outer water-blocking insulating tube; The inner side of the external water-blocking insulating tube is provided with a double-conductor pressure-blocking component. The dual-conductor pressure-blocking assembly includes a middle-limiting insulating tube; Multiple middle-limiting insulating tubes are equidistantly arranged in the middle of the inner side of the outer water-blocking insulating tube, and several inner-limiting armored sheets are equidistantly laid on the inner ends of the multiple middle-limiting insulating tubes. Several inner limiting armor plates are bonded to the inner side with an outer thermally conductive elastic correction pad, and several inner semi-conductive plates are equidistantly snapped onto the outer end of the conductive wire core. Several inner semiconducting sheets are sleeved with inner limiting and sealing insulating tubes on their outer ends, and several biconvex semiconducting sheets are laid at equal intervals on the outer ends of the inner limiting and sealing insulating tubes. Several metal shielding strips are wound around the outer ends of several biconvex semiconducting sheets, and flame-retardant elastic sleeves are bonded to the outer ends of several metal shielding strips. A heat-dissipating clip is laid on the outer end of the flame-retardant elastic sleeve.

[0006] According to the above technical solution, the inner length and width of the inner limiting and sealing insulating tube are equal to the outer length and width of the inner semiconductive sheet, and there are four flame-retardant elastic sleeves. The inner diameter of the guiding heat dissipation clamping piece is equal to the outer diameter of the flame-retardant elastic sleeve.

[0007] According to the above technical solution, a flame-retardant pressing strip is wrapped around the outer end of the heat dissipation clamping plate; The outer end of the flame-retardant pressing strip is bonded with a clamping guide strip, and one end of the clamping guide strip is snapped into an inner hollow locking and limiting box. A single-convex high-sensitivity airbag is installed inside the inner hollow card slot limiting box, and a one-way moving strip is attached to one end of the single-convex high-sensitivity airbag. The inner end of the hollow card slot limiting box is attached to the outer end of the flame-retardant pressing strip, and the one-way moving strip is slidably installed inside the hollow card slot limiting box.

[0008] According to the above technical solution, a heat-insulating limiting sheet is glued to one end of the unidirectional moving strip, and a number of high-elastic bands are glued to one end of the heat-insulating limiting sheet at equal intervals. A double-convex partition temperature control frame is provided between the inner hollow card slot limiting box and the outer thermally conductive elastic correction pad, and a heat-absorbing bidirectional airbag is bonded to the bottom inner side of the double-convex partition temperature control frame. The heat insulation limiting sheet is slidably installed on the side of the inner hollow card slot limiting box, and one end of the high elastic band is snapped onto the outer side of the inner hollow card slot limiting box.

[0009] According to the above technical solution, a high thermal conductivity contact sheet is bonded to one end of the heat-absorbing bidirectional airbag at the position corresponding to the heat insulation and limiting sheet. Several fine-tuning pressure springs are equidistantly installed on the top inner side of the double-convex partition temperature control frame, and the top of the several fine-tuning pressure springs are welded with a double-convex pressure limiting frame. The flame-retardant elastic sleeve has several pressure-relief plates equidistantly bonded to one end of its inner side, and a compression spring frame is installed on one end of each pressure-relief plate. The outer end of the heat insulation limiting sheet is attached to the inner end of the contact high thermal conductivity sheet, and the inner end of the contact high thermal conductivity sheet is inserted and installed on the outside of the inner hollow card slot limiting box.

[0010] According to the above technical solution, the pressure limiting frame is slidably installed inside the double convex partition temperature control frame, one end of the compression spring frame is engaged with the inner end of the flame-retardant elastic sleeve, and the longitudinal section of the inner limiting armor plate, the outer thermally conductive elastic correction pad, the inner hollow positioning limiting box and the double convex partition temperature control frame are all arc-shaped.

[0011] According to the above technical solution, a pressure-reducing isolation assembly is provided on the side end of the external water-blocking insulating tube; The pressure-relief closed isolation assembly includes telescopic inner and outer exchange plates; The inner end of the outer water-blocking insulating tube is provided with several telescopic inner and outer exchange plates at equal intervals, and the inner end of the telescopic inner and outer exchange plates is provided with several multi-groove filling pressure-relieving strips at equal intervals. Several multi-slot filling pressure-relieving strips are provided with several combined connecting slots at equal intervals on their outer ends, and several combined insert plates are welded at equal intervals on the ends of the multi-slot filling pressure-relieving strips away from the combined connecting slots. The inner ends of the plurality of multi-groove filling pressure-relieving strips are sleeved with concave insulating water-blocking tubes, and the inner ends of the concave insulating water-blocking tubes are equidistantly bonded with a plurality of drying combination strips. The outer ends of the water-blocking insulating tube are bonded with protruding sleeves, and one end of the inner side of the protruding sleeve is bonded with a sealed airbag. One end of the protruding sleeve is connected to a one-way air-closing valve.

[0012] According to the above technical solution, a convex card arc limiting plate is symmetrically bonded to the outer end of the convex combination sleeve; The two convex arc limiting plates are connected by combination bolts, and a drying mesh cage is glued to the inner side of the convex arc limiting plates; The outer ends of the plurality of middle-limiting insulating tubes are all bonded with water-absorbing and swelling sealing tapes, and a three-convex central support strip is provided between the plurality of middle-limiting insulating tubes; The combined insert plate is inserted and installed inside the combined connecting groove, and two adjacent multi-groove filling pressure relief strips are in contact with each other. The longitudinal section of the multi-groove filling pressure relief strip is arc-shaped.

[0013] According to the above technical solution, multiple edge-limiting double clamping strips are equidistantly snapped onto the side ends of the three-convex central support strip, and a compression assembly piece is glued to one end of two adjacent edge-limiting double clamping strips. The outer ends of the edge limit double clamp strip and the compression combination piece are fitted with a correction buffer block, and the side ends of the three convex central support strip, the edge limit double clamp strip and the correction buffer block are equally spaced with several compression buffer grooves. The inner end of the drying assembly belt is attached to the outer end of the correction buffer block, and there are two of each of the convex assembly sleeve and the convex arc limiting plate.

[0014] According to the above technical solution, one end of the edge-limiting double clamp strip is attached to the outer end of the water-absorbing and expanding sealing strip, there are three edge-limiting double clamp strips, and the longitudinal section of the compression combination piece and the correction buffer block are both arc-shaped.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Equipped with a dual-conductor pressure buffer assembly, heat is conducted outward through a metal shielding strip, a heat dissipation guide clip, and a flame-retardant pressing strip to heat the single-convex high-sensitivity airbag inside the inner cavity locking box. The thermal expansion and contraction of the single-convex high-sensitivity airbag adjusts the position of the unidirectional moving strip and the heat insulation limiting plate. In conjunction with the thermal expansion and contraction of the heat-absorbing bidirectional airbag, the contact high thermal conductivity plate is moved, adjusting the contact area between the heat insulation limiting plate, the inner cavity locking box, and the contact high thermal conductivity plate. By using the synchronous switching of central heat insulation and heat conduction, the heat dissipation rate from the inside to the outside is adjusted, ensuring a constant internal temperature during continuous operation. This reduces the gaps caused by repeated internal thermal expansion and contraction, thereby reducing gaps between the insulation layer and shielding components caused by continuous expansion and contraction. At the same time, by using constant temperature, the rate of thermal aging is reduced, which greatly improves the stability of the connection of various components inside the cable and reduces the probability of aging ionization damage. The compression spring frame drives the expansion and contraction of the compression treatment plate. The compression treatment plate buffers the inner compression-sealing insulation tube, the double-convex semi-conductive sheet, and the metal shielding strip. The heat-absorbing bidirectional airbag pushes the double-convex temperature control frame to move. The compression spring adjusts the compression double-convex compression limit frame. The bidirectional buffer compression treatment in the middle adjusts the internal space during thermal expansion and contraction, ensuring the tightness of the overall connection. This allows for timely adjustment of the position of each component when the cable experiences overload high temperature or low load low temperature. It also prevents the gaps between components due to different thermal expansion and contraction coefficients caused by continuous thermal expansion and contraction, which could lead to ionization breakdown inside the cable. This improves the stability and safety of cable operation. By controlling the thermal conductivity area and the extrusion position, this technology effectively solves the problem of gaps arising from the separation of components due to the fixed thermal conductivity and area of ​​the cable and different thermal expansion rates. By rapidly adjusting the thermal conductivity area in the middle, the thermal conductivity of the inner and outer layers is changed. Combined with the elastic expansion and contraction components, the connection positions between the components are adjusted to ensure a constant internal temperature. At the same time, the extrusion restriction prevents gaps from arising due to different thermal expansion coefficients of the components during thermal expansion and contraction. This reduces the rate of thermal aging of internal components and the size of the gaps between external components, thereby reducing cable breakdown damage caused by aging and gap ionization, and improving the cable's anti-aging effect and operational stability.

[0016] 2. Equipped with a pressure-reducing and isolation assembly, it uses the expansion and contraction of inner and outer exchange plates and multi-groove filling pressure-reducing strips for compression and bending. It also uses the combination connection groove, concave insulating water-blocking pipe and combination plug plate for expansion and contraction correction. The three-convex central support strip and the edge limit double clamp strip deform simultaneously. The pressure-closing assembly and the correction buffer block are bent synchronously. Through arbitrary elastic deformation at the center position, combined with self-adjusting unidirectional bending and elastic expansion, the internal components of the cable are buffered and limited. The pressure-closing assembly elastically seals and limits the connection edge between the three sets of correction buffer blocks, realizing elastic buffering during cable transportation and laying bending. Through the overall buffering on the outside and the multiple elastic expansion and contraction on the inside, the actual bending amplitude of the middle limit separator insulation tube is reduced, avoiding the bending and breakage of the internal rigid structure or the bending and puncture damage of the insulation layer due to instantaneous excessive bending, thus ensuring the stability of the internal protective layers and rigid structure. The cable exterior is treated with a double layer of water-blocking material using an outer water-blocking insulating tube and an inner concave water-blocking insulating tube. This is combined with an internal drying assembly tape and a water-absorbing expansion sealing tape to dehydrate the exterior and seal the connection edges with water absorption and expansion. This multi-layered water-blocking insulation, dehydration, drying, and water-absorbing expansion sealing system, working from the outside in, intercepts and restricts moisture, reducing the probability of water treeing and aging inside the cable. The outer convex assembly sleeve, sealed airbag, convex arc-limiting plate, and drying mesh cage further seal and dry the joints, reducing moisture corrosion of the cable joints and internal components. This prevents cable breakdown due to reduced insulation performance caused by aging internal insulation components, thus improving the cable's corrosion resistance.

[0017] In summary, by combining the dual-conductor pressure-reducing isolation component and the pressure-reducing closed isolation component, and through multi-segment insulation treatment from the outside in, water absorption sealing and drying treatment at the edges and outer sides, and internal multi-segment temperature control and expansion compression treatment, the dryness of the cable's interior is ensured, preventing water vapor erosion that could lead to water treeing and aging. This reduces the rate of environmental corrosion on the cable. Furthermore, the internal self-adjustment and temperature control treatments reduce aging caused by temperature and cable expansion and contraction, thereby greatly improving the cable's operational stability, ensuring its corrosion resistance and anti-aging effects, and extending its service life. Attached Figure Description

[0018] 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.

[0019] 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 installation structure of the external water-blocking insulating tube of the present invention; Figure 3 This is a schematic diagram of the structure of the dual-conductor pressure-relieving assembly of the present invention; Figure 4 This is a schematic diagram of the installation structure of the inner-limiting pressure-sealing insulating tube of the present invention; Figure 5 This is a schematic diagram of the installation structure of the flame-retardant elastic sleeve of the present invention; Figure 6 This is a schematic diagram of the installation structure of the clamp guide strip of the present invention; Figure 7 This is a schematic diagram of the structure of the pressure-reducing closed isolation assembly of the present invention; Figure 8 This is a schematic diagram of the installation structure of the drying assembly belt of the present invention; Figure 9 This is a schematic diagram of the installation structure of the convex card arc limiting plate of the present invention; Figure 10 This is a schematic diagram of the installation structure of the double clamping strip of the present invention; The diagram labels are: 1. External water-blocking insulating tube; 2. Conductive wire core; 3. Dual-conductor pressure-relief assembly; 301. Mid-limit insulating tube; 302. Inner limiting armored sheet; 303. Outer thermally conductive elastic correction pad; 304. Inner semi-conductive sheet; 305. Inner limiting pressure-sealing insulating tube; 306. Double-convex semi-conductive sheet; 307. Metal shielding strip; 308. Flame-retardant elastic sleeve; 309. Guide heat dissipation clamping sheet; 310. Flame-retardant pressing strip; 311. Clamping guide strip; 312. Inner hollow locking limiting box; 313. Single-convex high-sensitivity airbag; 314. Unidirectional moving strip; 315. Heat insulation limiting sheet; 316. High-elasticity elastic band; 317. Double-convex temperature control frame; 318. Heat-absorbing bidirectional airbag; 319. Contact high thermal conductivity sheet; 320. Fine-tuning pressure-sealing spring; 321. Pressure-relief double-convex pressure limiting frame; 322. Pressure treatment plate; 323. Pressure-sealing spring frame; 4. Pressure-relieving and sealing isolation assembly; 401. Telescopic inner and outer exchange plates; 402. Multi-groove filling pressure-relieving strip; 403. Combined connection groove; 404. Combined insert plate; 405. Concave insulating water-blocking pipe; 406. Drying combination belt; 407. Outwardly convex combination sleeve; 408. Sealed airbag; 409. One-way air shut-off valve; 410. Convex arc limiting plate; 411. Combined bolt; 412. Drying mesh cage; 413. Water-absorbing and expanding sealing belt; 414. Three-convex central support strip; 415. Edge limiting double clamp strip; 416. Compression sealing combination plate; 417. Correction buffer block; 418. Compression buffer groove. Detailed Implementation

[0020] 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.

[0021] Example: Figure 1-10 As shown, the present invention provides a technical solution, a corrosion-resistant and aging-resistant long-life medium-voltage cable, including an outer water-blocking insulating tube 1, and a plurality of conductive cores 2 are arranged inside the outer water-blocking insulating tube 1. A double-conductor pressure-blocking component 3 is provided inside the outer water-blocking insulating tube 1; The dual-conductor pressure-relief assembly 3 includes a middle-limiting insulating tube 301, an inner limiting armored sheet 302, an outer thermally conductive elastic correction pad 303, an inner semi-conductive sheet 304, an inner limiting pressure-closing insulating tube 305, a double-convex semi-conductive sheet 306, a metal shielding strip 307, a flame-retardant elastic sleeve 308, a heat-dissipating guiding clamping sheet 309, a flame-retardant pressing strip 310, a clamping guide strip 311, an inner hollow locking limiting box 312, a single-convex high-sensitivity airbag 313, a unidirectional moving strip 314, a heat-insulating limiting sheet 315, a high-elastic elastic band 316, a double-convex separating temperature control frame 317, a heat-absorbing bidirectional airbag 318, a contact high thermal conductivity sheet 319, a fine-tuning pressure-closing spring 320, a pressure-relief double-convex pressure-limiting frame 321, a pressure-relief treatment plate 322, and a pressure-closing spring frame 323. Multiple middle-limiting insulating tubes 301 are equidistantly arranged in the middle of the inner side of the outer water-blocking insulating tube 1, and several inner-limiting armored sheets 302 are equidistantly laid on the inner ends of the multiple middle-limiting insulating tubes 301. Several inner limiting armor plates 302 are bonded to the inner side with an outer thermally conductive elastic correction pad 303, and several inner semi-conductive plates 304 are equidistantly snapped onto the outer end of the conductive wire core 2. Several inner semiconducting sheets 304 are sleeved with inner limiting and closing insulating tubes 305 on their outer ends. The inner length and width of the inner limiting and closing insulating tubes 305 are equal to the outer length and width of the inner semiconducting sheets 304, respectively, to achieve alignment closure and insulation isolation. Several biconvex semiconducting sheets 306 are laid at equal intervals on the outer ends of the inner limiting and closing insulating tubes 305. Several biconvex semiconducting sheets 306 are wrapped with several metal shielding strips 307 on their outer ends. Several metal shielding strips 307 are bonded to flame-retardant elastic sleeves 308 on their outer ends. There are four flame-retardant elastic sleeves 308. The inner diameter of the heat dissipation clamping piece 309 is equal to the outer diameter of the flame-retardant elastic sleeve 308, ensuring the heat conduction efficiency to the outside and the stability of the flame retardancy in the center. The outer end of the flame-retardant elastic sleeve 308 is provided with a heat-dissipating guide clip 309, and the outer end of the heat-dissipating guide clip 309 is wrapped with a flame-retardant compression tape 310. The outer end of the flame-retardant pressing strip 310 is bonded with a clamping guide strip 311. One end of the clamping guide strip 311 is snapped with an inner hollow positioning limiting box 312. The longitudinal sections of the inner limiting armor plate 302, the outer thermally conductive elastic correction pad 303, the inner hollow positioning limiting box 312 and the double convex separating temperature control frame 317 are all arc-shaped. The inner end of the inner hollow positioning limiting box 312 is attached to the outer end of the flame-retardant pressing strip 310 to achieve positioning support and restriction. A single-convex high-sensitivity airbag 313 is installed inside the inner cavity card slot limiting box 312, and a one-way moving strip 314 is attached to one end of the single-convex high-sensitivity airbag 313. One end of the unidirectional moving strip 314 is bonded with a heat-insulating limiting piece 315, and a number of high-elasticity strips 316 are bonded at equal intervals to one end of the heat-insulating limiting piece 315. The unidirectional moving strip 314 is slidably installed inside the inner hollow card slot limiting box 312, the heat-insulating limiting piece 315 is slidably installed on the side of the inner hollow card slot limiting box 312, and one end of the high-elasticity strip 316 is snapped and installed on the outer side of the inner hollow card slot limiting box 312 to achieve telescopic guidance. A double-convex separating temperature control frame 317 is provided between the inner hollow card slot limiting box 312 and the outer thermally conductive elastic correction pad 303. A heat-absorbing bidirectional airbag 318 is attached to the bottom of the inner side of the double-convex separating temperature control frame 317. A high thermal conductivity contact sheet 319 is bonded to one end of the heat-absorbing bidirectional airbag 318 at the position corresponding to the heat insulation limiting sheet 315. The outer end of the heat insulation limiting sheet 315 is attached to the inner end of the high thermal conductivity contact sheet 319. The inner end of the high thermal conductivity contact sheet 319 is inserted and installed on the outside of the hollow card slot limiting box 312 to adjust the heat exchange surface and ensure steady cooling and temperature control during continuous heat exchange and temperature changes. Several fine-adjustment compression springs 320 are equidistantly installed on the top of the inner side of the double-convex partition temperature control frame 317. The top of the several fine-adjustment compression springs 320 is welded with a counter-pressure double-convex pressure limiting frame 321. The counter-pressure double-convex pressure limiting frame 321 is slidably installed on the inner side of the double-convex partition temperature control frame 317 to realize lifting and moving and positioning and pressing, so that it can be steadily closed and positioned during thermal expansion and contraction. Several pressure-relief plates 322 are equidistantly bonded to one end of the inner side of the flame-retardant elastic sleeve 308. A compression spring frame 323 is installed at one end of the compression-relief plate 322. One end of the compression spring frame 323 is engaged with the inner end of the flame-retardant elastic sleeve 308 to ensure elastic expansion and positioning restriction.

[0022] The outer water-blocking insulating pipe 1 is equipped with a pressure-reducing group isolation component 4 at one end; The pressure-relieving and isolation assembly 4 includes a telescopic inner and outer exchange plate 401, a multi-groove filling pressure-relieving strip 402, a combined connecting groove 403, a combined insert plate 404, a concave insulating water-blocking tube 405, a drying combination belt 406, an outward convex combination sleeve 407, a sealed airbag 408, a one-way air-sealing valve 409, a convex arc-limiting plate 410, a combined bolt 411, a drying net cage 412, a water-absorbing and expanding airtight strip 413, a three-convex central support strip 414, a side-limiting double clamping strip 415, a pressure-sealing combination plate 416, a corrective buffer block 417, and a pressure-sealing buffer groove 418. Several telescopic inner and outer exchange plates 401 are laid at equal intervals on the inner end of the outer water-blocking insulating pipe 1, and several multi-groove filling pressure-relieving strips 402 are installed at equal intervals on the inner end of the several telescopic inner and outer exchange plates 401. Several multi-slot filling and pressure-relieving strips 402 are provided with several combined connecting slots 403 at equal intervals on their outer ends. Several combined insert plates 404 are welded at equal intervals on the ends of the multi-slot filling and pressure-relieving strips 402 away from the combined connecting slots 403. The combined insert plates 404 are inserted and installed inside the combined connecting slots 403. Two adjacent multi-slot filling and pressure-relieving strips 402 are in close contact with each other. The longitudinal section of the multi-slot filling and pressure-relieving strips 402 is arc-shaped, realizing the interconnection and telescopic locking of multiple sets of multi-slot filling and pressure-relieving strips 402. Several multi-groove filling pressure-relieving strips 402 are sleeved with concave insulating water-blocking tubes 405 on their inner ends, and several drying combination strips 406 are equidistantly bonded to the inner ends of the concave insulating water-blocking tubes 405. The outer ends of the water-blocking insulating tube 1 are bonded with protruding combined sleeves 407, and one end of the inner side of the protruding combined sleeves 407 is bonded with a sealed airbag 408. One end of the convex combination sleeve 407 is connected to a one-way air-closing valve 409. A convex locking arc limiting plate 410 is symmetrically bonded to the outer end of the convex combination sleeve 407. There are two convex combination sleeves 407 and two convex locking arc limiting plates 410 to achieve locking combination and sealing isolation treatment. Two convex arc limiting plates 410 are connected by a combination bolt 411, and a drying mesh cage 412 is glued to the inside of the convex arc limiting plates 410. Multiple middle-limiting insulating tubes 301 are bonded with water-absorbing and expanding sealing tapes 413 on their outer ends, and three-convex middle support strips 414 are provided between the multiple middle-limiting insulating tubes 301. Multiple edge-limiting double-clamp strips 415 are equidistantly clamped at the side ends of the three-convex central support strip 414, and a compression combination piece 416 is glued to one end of two adjacent edge-limiting double-clamp strips 415. A correction buffer block 417 is sleeved on the outer end of the edge limiting double clamp strip 415 and the compression combination plate 416. The inner end of the drying combination belt 406 is attached to the outer end of the correction buffer block 417 to achieve drying and sealing treatment. One end of the edge limiting double clamp strip 415 is attached to the outer end of the water-absorbing expansion sealing belt 413 to achieve alignment and sealing treatment. There are three edge limiting double clamp strips 415. The longitudinal sections of the compression combination plate 416 and the correction buffer block 417 are all arc-shaped to achieve fitting and restriction treatment. Several compression buffer grooves 418 are equidistantly opened on the side ends of the three-convex central support strip 414, the edge limiting double clamp strip 415 and the correction buffer block 417.

[0023] The working principle and usage process of this invention: During cable laying or bending transportation, when the cable is bent, the bending of the outer limiting water-blocking insulating tube 1 compresses and bends the telescopic inner and outer exchange plates 401 and the multi-groove filling pressure-reducing strip 402. At this time, the groove of the multi-groove filling pressure-reducing strip 402 will be folded and stretched. During folding, the multi-groove filling pressure-reducing strip 402 moves slightly along the combined connecting groove 403 and the concave insulating water-blocking tube 405. At this time, the combined insert plate 404 moves along the combined connecting groove 403 to perform telescopic correction and ensure the stability of the external connecting components. At the same time, the three-convex central support strip 414 and the edge limiting double clamp strip 415 located on the outside of the three sets of wire cores deform simultaneously and are simultaneously bent by the compression combined plate 416 and the correction buffer block 417. When the three-convex central support strip 414 and the edge limiting double clamp strip 415 are bent, the three-convex central support strip 414 located in the center is bent. The support bar 414 can be elastically deformed at will, and together with the three sets of outer edge-limiting double clamping bars 415, it can be bent in one direction and elastically expanded. It can elastically limit the edges of the three sets of middle-limiting separator insulation tubes 301, and squeeze and buffer through the internal compression buffer groove 418 to reduce the elastic protection of the middle-limiting separator insulation tubes 301. It can also be bent, folded and expanded in one direction simultaneously with the correction buffer block 417. The compression combination piece 416 can elastically seal and limit the connection edge between the three sets of correction buffer blocks 417, so as to realize elastic buffering during cable transportation and laying. In addition, through the overall buffer on the outside and the multiple elastic expansion and contraction inside, the actual bending amplitude of the middle-limiting separator insulation tube 301 is reduced, avoiding the occurrence of bending and breakage of the internal rigid structure or bending and puncture damage of the insulation layer due to instantaneous excessive bending, thus ensuring the stability of the internal protective layers and rigid structure. When the two sets of cables are joined together, the workers use a wire stripping device to strip the cables and remove the three sets of conductive cores 2. Then, the outer end face of the cable is heated by a heat bonding device to make it slightly melted. Then, the outer convex combination sleeve 407 is inserted and squeezed to the outer end of the outer convex combination sleeve 407. During the combination, the three sets are joined together. After the combination is completed, the connection position is sealed with insulating waterproof tape. Then, the air is extracted from the outer convex combination sleeve 407 and the cable joint by an air pump and a one-way air shut-off valve 409 to create a negative pressure environment. During the continuous air extraction, the sealed airbag 408 expands continuously, pressing the cable joint stripping point, the outer convex combination sleeve 407 and the outer inner limit pressure-sealing insulation tube 305 side end of the conductive core 2 to seal and isolate the joint position. After the two sets of cable joints are processed, the three pairs of conductive cores 2 are pressed and connected one by one using a wire pressing assembly device. Then, the convex arc limiting plate 410 is bonded to the side end of the outer convex combination sleeve 407 with adhesive, and the two sets of convex arc limiting plates 410 are fixedly connected using combination bolts 411, thereby achieving airtight isolation of the cable joint. In conjunction with the silica gel desiccant in the internal drying mesh cage 412, long-term water absorption treatment is carried out to ensure the dryness of the joint and avoid the influence of the humid environment of the pipeline during the operation of the cable joint, thereby improving the safety and stability of the cable joint operation. During cable operation, the insulation layer is affected by the erosion of the external humid environment, which can cause water treeing and aging. Water blocking insulation is achieved through the external water-blocking insulation tube 1, and secondary water blocking insulation is achieved in conjunction with the internal concave water-blocking insulation tube 405. Drying and dehydration are achieved with the internal drying combination tape 406. At the same time, the water-absorbing and expanding sealing tape 413 is used to dehydrate, expand and seal the connection edges of the three-convex middle support strip 414, the edge limit double clamp strip 415, the compression combination piece 416 and the middle limit separation insulation tube 301. During long-term erosion, the multi-layer water blocking insulation, dehydration and drying and water absorption and expansion sealing components from the outside to the inside can intercept and limit water vapor, reducing the probability of water treeing and aging of the internal middle limit separation insulation tube 301 due to water vapor erosion. This avoids the cable self-breakdown caused by the aging of internal insulation components and the resulting reduction in insulation effect. Power is transmitted through the conductive core 2. The inner semiconducting sheet 304 and the double-convex semiconducting sheet 306 are used to fill the edges of the conductive core 2 and the inner limiting and pressing insulation tube 305, uniformly distributing the electric field on the conductor surface, eliminating tip discharge and air gap discharge at the junction of insulation and metal shielding. The metal shielding tape 307 is used to shield the electric field, enclosing the cable electric field within the insulation layer. At the same time, it can carry the capacitive current and short-circuit fault current when a single phase is grounded, ensuring the system installation. During power transmission, the conductive core 2 will heat up due to its own resistance. The heat is transferred to the inner empty slot limiting box 312 through the inner semiconducting sheet 304, the inner limiting and pressing insulation tube 305, the double-convex semiconducting sheet 306, the metal shielding tape 307, the flame-retardant elastic sleeve 308, the heat-dissipating clamping sheet 309, and the flame-retardant pressing tape 310, dissipating heat from the inside out. Heat is dispersed at multiple locations through the mutual contact of multiple sets of heat dissipation clamping plates 309, and the single convex high-sensitivity airbag 313 at the position of the inner hollow card slot limiting box 312 is heated. When the temperature rises, the single convex high-sensitivity airbag 313 expands and pushes the unidirectional moving strip 314 to move along the inner hollow card slot limiting box 312, and pulls the heat insulation limiting plate 315 to move along the inner hollow card slot limiting box 312. At this time, the high elastic band 316 is stretched, and the heat is transferred along the inner hollow card slot limiting box 312 to the position of the double convex partition temperature control frame 317. At this time, the heat-absorbing bidirectional airbag 318 located in the double convex partition temperature control frame 317 absorbs heat and expands, pushing the contact high thermal conductivity plate 319 to move downward, and finally pressing the contact high thermal conductivity plate 319 to the inside of the inner hollow card slot limiting box 312. Heat is transferred outward through contact between the inner hollow locking and limiting box 312 and the contact high thermal conductivity sheet 319. Then, heat is further transferred outward through the double convex separating temperature control frame 317, the opposing double convex pressure limiting frame 321, the outer thermal conductive elastic correction pad 303, the inner limiting armor sheet 302, the middle limiting separating insulation tube 301, the triple convex middle support strip 414, the edge limiting double clamp strip 415 and the compression combination sheet 416, thereby achieving heat dissipation from the inside out. When the conductive core 2 inside the cable is overloaded and overheated, the heat is used to heat and expand the single convex high-sensitivity airbag 313, adjusting the contact area between the heat insulation limiting sheet 315 and the contact high thermal conductivity sheet 319 and the inner hollow locking and limiting box 312, thereby adjusting the internal heat dissipation speed. While dissipating heat, the internal components expand to varying degrees due to thermal expansion and contraction. The compression spring 323 extends and retracts along the flame-retardant elastic sleeve 308, adjusting the position of the pressure-reducing plate 322 to buffer the internal position of the battery cell. The heat-absorbing bidirectional airbag 318 expands, pushing the contact high thermal conductivity sheet 319 downwards while simultaneously pushing the entire double-convex partition temperature control frame 317 upwards. At this time, the pressure-reducing double-convex pressure limiting frame 321 compresses the external thermally conductive elastic correction pad 303. During compression, the fine-tuning compression spring 320 adjusts the position of the pressure-reducing double-convex pressure limiting frame 321, adjusting the internal space during thermal expansion. Conversely, when the temperature decreases, the airbag again adjusts the heat-insulating limiting sheet. The contact area between the high thermal conductivity plate 315 and the internal cavity retaining box 312 ensures a constant internal temperature. Meanwhile, the external components are compressed and restricted by the micro-adjustment compression spring 320 pushing the double-convex pressure limiting frame 321 and the double-convex partition temperature control frame 317 to move bidirectionally. This, along with the compression treatment plate 322 and the compression spring frame 323, provides synchronous compression correction to ensure the tightness of the overall connection. This allows for timely adjustment of the position of each component when the cable experiences overload high temperature or low load low temperature, preventing gap separation caused by different coefficients of thermal expansion and contraction due to continuous thermal expansion and contraction, which could lead to ionization breakdown inside the cable. This improves the stability and safety of cable operation.

[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. A corrosion-resistant and aging-resistant long-life medium-voltage cable, comprising an external water-blocking insulating tube (1), characterized in that: Multiple conductive cores (2) are provided on the inner side of the external water-blocking insulating tube (1). The inner side of the external water-blocking insulating tube (1) is provided with a double-conductor pressure-blocking component (3). The dual-conductor pressure-blocking assembly (3) includes a middle-limiting insulating tube (301). The outer water-blocking insulating tube (1) has multiple middle-limiting separating insulating tubes (301) equidistantly arranged in the middle of its inner side, and multiple inner-limiting armored plates (302) are equidistantly laid on the inner ends of the multiple middle-limiting separating insulating tubes (301). Several inner limiting armor plates (302) are bonded with outer thermally conductive elastic correction pads (303), and several inner semi-conductive plates (304) are equidistantly snapped onto the outer ends of the conductive wire core (2). An inner limiting and sealing insulating tube (305) is sleeved on the outer end of several inner semiconducting sheets (304), and several biconvex semiconducting sheets (306) are laid at equal intervals on the outer end of the inner limiting and sealing insulating tube (305). Several metal shielding strips (307) are wound around the outer ends of several biconvex semiconducting sheets (306), and flame-retardant elastic sleeves (308) are bonded to the outer ends of several metal shielding strips (307). A heat-dissipating clip (309) is laid on the outer end of the flame-retardant elastic sleeve (308).

2. The corrosion-resistant and aging-resistant long-life medium-voltage cable according to claim 1, characterized in that, The inner length and width of the inner limiting pressure-sealing insulating tube (305) are equal to the outer length and width of the inner semiconductive sheet (304), and there are four flame-retardant elastic sleeves (308). The inner diameter of the guiding heat dissipation clamping piece (309) is equal to the outer diameter of the flame-retardant elastic sleeve (308).

3. The corrosion-resistant and aging-resistant long-life medium-voltage cable according to claim 1, characterized in that, The outer end of the heat dissipation clamping plate (309) is wrapped with a flame-retardant pressing tape (310). The outer end of the flame-retardant pressing strip (310) is bonded with a clamping guide strip (311), and one end of the clamping guide strip (311) is snapped with an inner hollow locking space limiting box (312). The inner side of the hollow card slot limiting box (312) is equipped with a single convex high-sensitivity airbag (313), and a one-way moving strip (314) is attached to one end of the single convex high-sensitivity airbag (313). The inner end of the hollow card slot limiting box (312) is attached to the outer end of the flame-retardant pressing strip (310), and the one-way moving strip (314) is slidably installed on the inner side of the hollow card slot limiting box (312).

4. The corrosion-resistant and aging-resistant long-life medium-voltage cable according to claim 3, characterized in that, One end of the unidirectional moving strip (314) is bonded with a heat-insulating limiting sheet (315), and a number of high-elastic bands (316) are bonded at equal intervals to one end of the heat-insulating limiting sheet (315). A double-convex partition temperature control frame (317) is provided between the inner hollow card slot limiting box (312) and the outer thermally conductive elastic correction pad (303), and a heat-absorbing bidirectional airbag (318) is bonded to the bottom of the inner side of the double-convex partition temperature control frame (317). The heat insulation limiting sheet (315) is slidably installed on the side of the inner cavity locking box (312), and one end of the high elastic band (316) is snapped onto the outer side of the inner cavity locking box (312).

5. A corrosion-resistant and aging-resistant long-life medium-voltage cable according to claim 4, characterized in that, A high thermal conductivity sheet (319) is bonded to one end of the heat-absorbing bidirectional airbag (318) at the position corresponding to the heat insulation limiting sheet (315). Several fine-tuning pressure springs (320) are equidistantly installed on the top inner side of the double-convex partition temperature control frame (317), and a double-convex pressure limiting frame (321) is welded to the top of the several fine-tuning pressure springs (320). The flame-retardant elastic sleeve (308) has several pressure treatment plates (322) bonded at equal intervals on one end of its inner side, and a compression spring frame (323) is installed on one end of the pressure treatment plate (322). The outer end of the heat insulation limiting sheet (315) is attached to the inner end of the contact high thermal conductivity sheet (319), and the inner end of the contact high thermal conductivity sheet (319) is inserted and installed on the outside of the inner hollow card slot limiting box (312).

6. A corrosion-resistant and aging-resistant long-life medium-voltage cable according to claim 5, characterized in that, The pressure limiting bracket (321) is slidably installed inside the double convex partition temperature control bracket (317). One end of the compression spring bracket (323) is engaged with the inner end of the flame-retardant elastic sleeve (308). The longitudinal sections of the inner limiting armor plate (302), the outer thermally conductive elastic correction pad (303), the inner hollow positioning limiting box (312), and the double convex partition temperature control bracket (317) are all arc-shaped.

7. A corrosion-resistant and aging-resistant long-life medium-voltage cable according to claim 1, characterized in that, The outer water-blocking insulating tube (1) is provided with a pressure-reducing group isolation component (4) at its side end. The pressure-relief group isolation assembly (4) includes telescopic inner and outer exchange plates (401). The inner end of the outer water-blocking insulating tube (1) is provided with several telescopic inner and outer exchange plates (401) at equal intervals, and several multi-groove filling pressure-relieving strips (402) are installed at equal intervals on the inner end of the several telescopic inner and outer exchange plates (401). Several multi-groove filling pressure relief strips (402) are provided with several combined connecting grooves (403) at equal intervals on their outer ends, and several combined insert plates (404) are welded at equal intervals on one end of several multi-groove filling pressure relief strips (402) away from the combined connecting grooves (403). The inner ends of the plurality of multi-groove filling pressure-relieving strips (402) are sleeved with concave insulating water-blocking tubes (405), and the inner ends of the concave insulating water-blocking tubes (405) are equidistantly bonded with a plurality of drying combination strips (406). The outer ends of the water-blocking insulating tube (1) are bonded with an outwardly protruding combined sleeve (407), and one end of the inner side of the outwardly protruding combined sleeve (407) is bonded with a sealed airbag (408). One end of the protruding sleeve (407) is connected to a one-way air shut-off valve (409).

8. A corrosion-resistant and aging-resistant long-life medium-voltage cable according to claim 7, characterized in that, The outer end of the convex combination sleeve (407) is symmetrically bonded with a convex card arc limiting plate (410). The two convex arc limiting plates (410) are connected by a combination bolt (411), and a drying mesh cage (412) is bonded to the inner side of the convex arc limiting plate (410). The outer ends of the plurality of middle-limiting insulating tubes (301) are all bonded with water-absorbing and expanding sealing tape (413), and a three-convex middle support strip (414) is provided between the plurality of middle-limiting insulating tubes (301). The combined insert plate (404) is inserted and installed inside the combined connecting groove (403), and two adjacent multi-groove filling pressure relief strips (402) are in contact with each other. The longitudinal section of the multi-groove filling pressure relief strip (402) is arc-shaped.

9. A corrosion-resistant and aging-resistant long-life medium-voltage cable according to claim 8, characterized in that, The three-convex central support strip (414) has multiple edge limit double clamp strips (415) equidistantly clamped at the side ends, and a compression combination piece (416) is glued to one end of two adjacent edge limit double clamp strips (415). The outer ends of the edge-limiting double clamp strip (415) and the compression combination piece (416) are fitted with a correction buffer block (417), and the side ends of the three-convex central support strip (414), the edge-limiting double clamp strip (415) and the correction buffer block (417) are provided with a number of compression buffer grooves (418) at equal intervals. The inner end of the drying assembly belt (406) is attached to the outer end of the correction buffer block (417), and there are two of each of the convex assembly sleeve (407) and the convex arc limiting plate (410).

10. A corrosion-resistant and aging-resistant long-life medium-voltage cable according to claim 9, characterized in that, One end of the edge-limiting double clamp strip (415) is attached to the outer end of the water-absorbing and expanding sealing strip (413). There are three edge-limiting double clamp strips (415). The longitudinal sections of the compression combination piece (416) and the correction buffer block (417) are both arc-shaped.

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