A cross-linked polyethylene insulated power cable with a water-blocking structure

Abstract

This invention discloses a cross-linked polyethylene insulated power cable with a water-blocking structure, relating to the field of cable technology. Multiple partitioned grooves are evenly spaced on the outer side of the water-blocking layer, with four adjacent partitioned grooves forming a group. A water-absorbing sponge pad is placed inside each partitioned groove. Each group of partitioned grooves has an inner ring groove and an outer ring groove sequentially opened at both ends. An annular cloth bag is fitted inside the inner ring groove, and the annular cloth bag is filled with water-absorbing resin particles. An annular water-stop strip is fitted inside the outer ring groove. In this invention's water-blocking and bending-resistant assembly, the expanding annular cloth bag provides initial emergency water blocking. The gel-like resin, after absorbing water, is then absorbed by the annular water-stop strip through the water-absorbing cotton rope. The annular water-stop strip can block water for a long period, ensuring the cable's long-term normal operation after water ingress. When the cable bends due to external force, the supporting ribs and bending springs have good elasticity, allowing the cable to quickly return to its original shape after the external force is removed. The cable exhibits good bending resistance.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a cross-linked polyethylene insulated power cable with a water-blocking structure. Background Technology

[0002] Cross-linked polyethylene insulated power cables are power cables that use cross-linked polyethylene (XLPE) as the insulation layer. They are mainly used in fixed laying scenarios of power distribution networks or industrial equipment with a rated power frequency voltage of 0.6 / 1kV and below, covering environments such as overhead, indoor, tunnel, and cable trench. Armored types can be directly buried and withstand mechanical external forces. In the Chinese patent application number CN202422189138.2 entitled "A Water-Blocking and Buffering Protective Structure for Power Cables", the patent describes a system in which an alternating wrapping layer and a sheath are sequentially arranged outside the conductor core. A water-blocking pad is also provided in the sheath adjacent to the outermost layer and partially embedded around the outer periphery of the wrapping layer. This effectively improves the waterproofness of the power cable without compromising the protection of the conductor core. At the same time, the water-blocking pad, together with the buffer sleeves arranged circumferentially on the sheath, protects the bending points of the power cable. This patented cable can prevent water from penetrating into the cable by setting a water-blocking pad, thus ensuring the cable's radial water-blocking performance. However, the cable water-blocking pad of this patented cable cannot prevent water from penetrating along the cable's axial direction. When water penetrates along the cable's axial direction, the penetrating water will affect the cable's electrical insulation, and in severe cases, it will cause a short circuit in the cable, affecting the cable's normal use. Therefore, in order to ensure the normal use of the cable, it is necessary to ensure not only radial water blocking but also axial water blocking. In addition, the existing cable has poor bending resistance, and it is not easy for the cable to return to its original shape after being bent. Summary of the Invention

[0003] This invention provides a cross-linked polyethylene insulated power cable with a water-blocking structure, which can effectively solve the problem in the prior art where the water-blocking pad of the cable cannot prevent water from penetrating along the cable axis. When water penetrates along the cable axis, the penetrating water will affect the electrical insulation of the cable, and in severe cases, it will cause a short circuit in the cable, affecting the normal use of the cable. Therefore, it is necessary to ensure not only radial water blocking of the cable, but also axial water blocking of the cable. In addition, the existing cables have poor bending resistance and are not easy to restore their original shape after bending.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a cross-linked polyethylene insulated power cable with a water-blocking structure, comprising conductors, wherein four conductors are provided, an insulation layer is wrapped around the outside of the conductors, and a water-blocking and bending-resistant component is provided on the outside of the insulation layer, wherein the water-blocking and bending-resistant component includes supporting ribs; A supporting rib is provided at the center of the outer side of the four insulating layers. Multiple partition tubes are sleeved on the outer side of the supporting ribs at equal intervals. Four partition arc frames are evenly arranged on the outer side of the partition tubes. The four insulating layers are respectively located in the gap between two adjacent partition arc frames. The outer side of the partition arc frame is fitted with an inner sheath, the gap inside the inner sheath is filled with a protective sponge pad, the outer side of the inner sheath is wrapped with a water-blocking tape, the outer side of the water-blocking tape is wrapped with a shielding copper tape, and the outer side of the shielding copper tape is wrapped with a water-blocking layer. The outer side of the water-blocking layer is provided with multiple partitioned grooves at equal intervals. Four adjacent partitioned grooves form a group. A water-absorbing sponge pad is placed inside the partitioned groove. Each group of partitioned grooves has an inner ring groove and an outer ring groove opened at both ends in sequence. An annular cloth bag is sleeved inside the inner ring groove. The annular cloth bag is filled with water-absorbing resin particles. An annular water-stop strip is sleeved inside the outer ring groove.

[0005] According to the above technical solution, two adjacent partition tubes are connected by multiple connecting steel bars, and an isolation tube is sleeved on the outside of the connecting steel bars between two adjacent partition tubes.

[0006] According to the above technical solution, a thermally conductive silicone strip runs through the interior of the partition arc frame located in the same axial position. A filling channel is opened inside the thermally conductive silicone strip, and a bending-resistant spring runs through the filling channel.

[0007] According to the above technical solution, the four adjacent partition slots are separated by a partition strip, and a movable opening is provided between two adjacent partition strips. The four adjacent water-guiding sponge pads form a group, and the outer side of each group of water-guiding sponge pads is fixed by several rubber band rings, and the rubber band rings are embedded in the movable opening.

[0008] According to the above technical solution, one end of the annular cloth bag is connected to multiple absorbent cotton ropes, the absorbent cotton ropes are embedded in one end of the adjacent water-absorbing sponge pad, one end of the annular water-stop strip is connected to multiple water-absorbing cotton ropes, and the top of the water-absorbing cotton ropes is embedded inside the adjacent annular cloth bag.

[0009] According to the above technical solution, the water-blocking layer is wrapped with an outer sheath, and a gap is left between the outer sheath and the annular water-stop strip.

[0010] According to the above technical solution, a connector protection assembly is provided on the outer side of the outer sheath, and the connector protection assembly includes a heat shrinkable sheath; The outer sheath is provided with a heat shrinkable sheath, and two inner shells are fixed to the outside of the heat shrinkable sheath. Sealing rings are fixed at both ends of the inner shells and located outside the outer sheath. Sealing skirts are provided at both ends of the outer side of the inner shells. Two outer shells are fixed to the outside of the inner shell. Skirt grooves are opened at both ends inside the outer shell. The sealing skirt is embedded in the adjacent skirt groove. The outer shell is connected to two arc-shaped strips at both ends. The outer sides of the arc-shaped strips at the same end are fixedly connected by a fixing hoop. A sealing ring is fitted on the outer side of the outer sheath inside the arc-shaped strip.

[0011] According to the above technical solution, the inner shell has an inner opening in the middle, a desiccant is placed inside the inner opening, and the two inner shells are connected to each other by inner fixing ears, and two adjacent inner fixing ears are fixedly connected by bolts.

[0012] According to the above technical solution, a sealing strip is provided at one of the outer shell joints, and a sealing groove is provided at the other outer shell joint. The sealing strip is embedded in the sealing groove. External fixing ears are connected to both sides of the outer shell, and two adjacent external fixing ears are fixedly connected by bolts.

[0013] According to the above technical solution, a support box is provided on the outside of the outer shell, the inner fixing ear is located inside the support box, threaded cylinders are connected to the top and bottom of the support box, support plates are provided on both sides of the bottom of the outer shell, support screws are rotatably connected to the top two ends of the support plates, the top of the support screws are connected to the threaded cylinders located at the bottom through screw holes, and shock-absorbing pads are adhered to the bottom of the support plates.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Equipped with water-blocking and bending-resistant components, when water enters the cable through a damaged area, the water-absorbing sponge pad quickly absorbs the water. Under capillary action, the water absorbed by the sponge pad enters the annular bag through the absorbent cotton rope and is absorbed by the absorbent resin particles. After absorbing water, the absorbent resin particles quickly expand into a gel inside the annular bag. The expanded annular bag blocks the water. The absorbent resin particles absorb water quickly to form a water-blocking gel, preventing water from penetrating along the cable axis and improving the cable's water-blocking ability. The cable is also equipped with an annular water-stop strip. After the absorbent resin particles in the annular bag absorb water, the absorbed water is absorbed by the annular water-stop strip through the absorbent cotton rope. The annular water-stop strip expands as quickly as the absorbent resin particles when exposed to water, but it does not dissolve or precipitate after long-term immersion in water, ensuring the long-term water-blocking performance of the entire cable. The cable has good water-blocking performance. The inner sheath of the cable is wrapped with a water-blocking tape. When the water-blocking layer is damaged, the water-blocking tape can prevent water from penetrating radially into the cable, further improving the cable's water-blocking performance. The separator tubes and separator arcs are made of stainless steel. They support and separate each conductor, improving the cable's compressive strength. Adjacent separator tubes are connected by multiple connecting steel bars to ensure the cable's flexibility. The thermally conductive silicone strips work in conjunction with the separator arcs to separate each conductor, preventing squeezing and friction between them. The thermally conductive silicone strips have filling channels with bending springs running through them. When the cable is subjected to external forces, the separator tubes and separator arcs increase the cable's support strength. Combined with the elasticity of the bending springs and the absorption of external forces by the thermally conductive silicone strips, as well as the absorption of external forces by the protective and water-absorbing sponge pads, the cable conductors are protected in all directions, resulting in strong compressive strength. When the cable is bent by external force, the supporting ribs and bending springs have good elasticity. When the external force is removed, the cable can quickly return to its original shape, giving the cable good bending resistance. In addition, the thermally conductive silicone strip is made of thermally conductive silicone material, so the heat generated by the conductor can be conducted to the thermally conductive silicone strip, and the heat on the thermally conductive silicone strip can be conducted to the bending spring. The cable has sufficient heat dissipation area and good heat dissipation performance.

[0015] 2. Equipped with a joint protection component, the inner and outer sheaths are made of aluminum, which can protect the cable joint. A sealing ring is fitted inside the arc strip on the outer side of the outer sheath. The arc strip can tighten and fix the sealing ring, and the sealing ring can seal the joint, preventing water from entering the joint between the outer sheath and the outer sheath. When the cable joint is bent, the arc strip and the sealing ring provide elastic support between the outer sheath and the outer sheath, and transfer the bending force, avoiding excessive bending at the joint between the outer sheath and the outer sheath, thus preventing damage to the joint due to excessive bending. The cable joint has strong bending resistance. The outer sheath has skirt grooves and sealing rings at both ends inside. When water enters the joint between the outer sheath and the outer sleeve, the sealing skirts and sealing rings can prevent water from flowing into the outer sheath. The outer sheath joint is equipped with sealing strips and sealing grooves. After the two outer sheaths are fixed together, the sealing strips and sealing grooves can increase the contact area between the two outer sheaths, ensuring the sealing of the joint. The sealing skirts and skirt grooves, together with the sealing of the outer sheath, further ensure the sealing of the cable joint. The inner sheath has an inner opening in the middle, and a desiccant is placed inside the inner opening to ensure the dryness of the space between the outer and inner sheaths, preventing moisture from corroding the cable joint and ensuring the electrical insulation of the cable joint.

[0016] In summary, the water-blocking and bending-resistant assembly utilizes an expanding annular cloth bag for initial emergency water blocking. The water-absorbing gel-like resin is then absorbed by the annular water-stop strip via a water-guiding cotton rope. The annular water-stop strip provides long-term water blocking, ensuring the cable's long-term normal operation even after water ingress. The joint protection assembly, with a sealing ring at the joint between the outer sheath and the outer jacket, and sealing skirts and sealing rings at both ends of the inner sheath, prevents water from flowing into the outer sheath. The combined water-blocking structures of the two components fully guarantee the overall water-blocking performance of the cable during use, resulting in better water-blocking performance. Attached Figure Description

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

[0018] In the attached diagram: Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the water-blocking and bending-resistant component of the present invention; Figure 3 This is a schematic diagram of the installation structure of the protective sponge pad of the present invention; Figure 4 This is a schematic diagram of the installation structure of the water-guiding sponge pad of the present invention; Figure 5 This is a schematic diagram of the installation structure of the rubber band ring of the present invention; Figure 6 This is a schematic diagram of the installation structure of the annular cloth bag of the present invention; Figure 7 This is a schematic diagram of the installation structure of the partition arc frame of the present invention; Figure 8 This is a schematic diagram of the installation structure of the bending spring of the present invention; Figure 9 This is a schematic diagram of the installation structure of the supporting ribs of the present invention; Figure 10 This is a schematic diagram of the joint protection assembly of the present invention; Figure 11 This is a schematic diagram of the installation structure of the outer protective shell of the present invention; Figure 12 This is a schematic diagram of the installation structure of the sealing strip of the present invention; Figure 13 This is a schematic diagram of the installation structure of the inner protective shell of the present invention; Figure 14 This is a schematic diagram of the installation structure of the sealing ring of the present invention; The diagram is labeled: 1. Conductor; 2. Insulating layer; 3. Water-blocking and bending-resistant components; 301. Supporting ribs; 302. Dividing frame tubes; 303. Dividing arc frames; 304. Connecting steel bars; 305. Isolation tubes; 306. Thermally conductive silicone strips; 307. Filling channels; 308. Bending-resistant springs; 309. Inner sheath; 310. Protective sponge pads; 311. Water-blocking strips; 312. Shielding copper strips; 313. Water-blocking layer; 314. Partition grooves; 315. Dividing strips; 316. Water-diverting sponge pads; 317. Movable openings; 318. Rubber band rings; 319. Inner ring grooves; 320. Outer ring grooves; 321. Annular cloth bags; 322. Absorbent cotton ropes; 323. Annular water-stop strips; 324. Water-diverting cotton ropes; 325. Outer sheaths; 4. Connector protection components; 401. Heat shrink sleeve; 402. Inner shell; 403. Inner inlet; 404. Desiccant bag; 405. Inner fixing ear; 406. Sealing ring; 407. Sealing skirt; 408. Outer shell; 409. Skirt groove; 410. Sealing strip; 411. Sealing groove; 412. Outer fixing ear; 413. Arc strip; 414. Sealing ring; 415. Fixing clamp; 416. Support box; 417. Threaded cylinder; 418. Support plate; 419. Support screw; 420. Shock-absorbing pad. Detailed Implementation

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

[0020] Example: Figure 1-14 As shown, the present invention provides a cross-linked polyethylene insulated power cable with a water-blocking structure, including a conductor 1, of which four conductors are provided. The conductor 1 is wrapped with an insulation layer 2. A water-blocking and bending-resistant component 3 is provided on the outside of the insulation layer 2. The water-blocking and bending-resistant component 3 includes a supporting rib 301, a partition frame tube 302, a partition arc frame 303, a connecting steel strip 304, an isolation tube 305, a thermally conductive silicone strip 306, a filling channel 307, a bending-resistant spring 308, an inner sheath 309, a protective sponge pad 310, a water-blocking tape 311, a shielding copper tape 312, a water-blocking layer 313, a partition groove 314, a partition strip 315, a water-conducting sponge pad 316, a movable opening 317, a rubber band ring 318, an inner ring groove 319, an outer ring groove 320, an annular cloth bag 321, a water-absorbing cotton rope 322, an annular water-stop strip 323, a water-conducting cotton rope 324, and an outer sheath 325. Supporting ribs 301 are provided at the center of the outer side of the four insulation layers 2. Multiple partition tubes 302 are sleeved at equal intervals on the outer side of the supporting ribs 301. Four partition arc frames 303 are evenly arranged on the outer side of the partition tubes 302. The four insulation layers 2 are respectively located in the gap between two adjacent partition arc frames 303. The partition tubes 302 and partition arc frames 303 are made of stainless steel. The partition tubes 302 and partition arc frames 303 can support and separate each conductor 1, improving the compressive strength of the cable. Two adjacent partition tubes 302 are connected by multiple connecting steel bars 304. The flexible connecting steel bars 304 can connect the partition tubes 302 one by one, ensuring the flexibility of the cable. An isolation tube 305 is sleeved on the outer side of the connecting steel bars 304 between two adjacent partition tubes 302. The isolation tube 305 is made of rubber. The isolation tube 305 can separate the connecting steel bars 304 from the insulation layers 2, preventing friction between the connecting steel bars 304 and the insulation layers 2, and protecting the insulation layers 2. A thermally conductive silicone strip 306 runs through the interior of the partition arc frame 303 located in the same axial position. The thermally conductive silicone strip 306 is made of thermally conductive silicone. The thermally conductive silicone strip 306 and the partition arc frame 303 work together to separate each conductor 1, avoid squeezing and friction between conductors 1, and protect the insulation layer 2 on the outside of each conductor 1. The thermally conductive silicone strip 306 has a filling channel 307 inside, and a bending spring 308 runs through the filling channel 307. When the cable is subjected to external force, the partition tube 302 and the partition arc frame 303 increase the support strength of the cable. Combined with the elasticity of the bending spring 308 and the absorption of external force by the thermally conductive silicone strip 306, each conductor 1 can be protected, further improving the cable's compressive strength. The outer side of the partition arc frame 303 is fitted with an inner sheath 309. The gap inside the inner sheath 309 is filled with a protective sponge pad 310. The outer side of the inner sheath 309 is wrapped with a water-blocking tape 311. The outer side of the water-blocking tape 311 is wrapped with a shielding copper tape 312. The outer side of the shielding copper tape 312 is wrapped with a water-blocking layer 313. Multiple partitioned grooves 314 are evenly spaced on the outer side of the water-blocking layer 313. Four adjacent partitioned grooves 314 form a group. A water-absorbing sponge pad 316 is placed inside the partitioned groove 314. The four adjacent partitioned grooves 314 are separated by a separator strip 315. A movable opening 317 is provided between two adjacent separator strips 315. The movable opening 317 can provide bending space for the cable. Four adjacent water-absorbing sponge pads 316 form a group. The outer side of each group of water-absorbing sponge pads 316 is fixed by several elastic band rings 318. The elastic band rings 318 are embedded in the movable opening 317. The elastic band rings 318 are made of elastic rubber and can tighten and fix the water-absorbing sponge pads 316 in a group. Each group of partitioned grooves 314 has an inner ring groove 319 and an outer ring groove 319 at both ends. 20. An annular cloth bag 321 is fitted inside the inner annular groove 319. The annular cloth bag 321 is filled with water-absorbing resin particles. After absorbing water, the water-absorbing resin particles will quickly expand into a gel inside the annular cloth bag 321. The gel-like resin will fill the gap between the outer sheath 325 and the water-blocking layer 313 to block water and prevent water from seeping along the cable axis. One end of the annular cloth bag 321 is connected to multiple water-absorbing cotton ropes 322. The water-absorbing cotton ropes 322 are embedded in one end of the adjacent water-absorbing sponge pad 316. After the cable sheath is damaged, when water enters the inside of the cable through the damaged area, the water-absorbing sponge pad 316 will quickly absorb the water. Under the action of capillary water absorption, the water absorbed by the water-absorbing sponge pad 316 will enter the annular cloth bag 321 through the water-absorbing cotton ropes 322 and be absorbed by the water-absorbing resin particles. An annular waterstop strip 323 is fitted inside the outer ring groove 320. One end of the annular waterstop strip 323 is connected to multiple water-guiding cotton ropes 324. The top of the water-guiding cotton ropes 324 is embedded inside the adjacent annular cloth bag 321. After the absorbent resin particles in the annular cloth bag 321 absorb water, the absorbed water will also be absorbed by the annular waterstop strip 323 through the water-guiding cotton ropes 324. The annular waterstop strip 323 is a water-swellable waterstop strip in the prior art. It is a high-molecular waterproof material composed of a rubber matrix and a highly absorbent functional filler. The annular waterstop strip 323 is a product-type expandable waterstop strip. After absorbing water, the product-type expandable waterstop strip can expand within 24 hours. Moreover, the expandable waterstop strip does not dissolve or precipitate after long-term immersion in water and is resistant to salt and alkali corrosion. The outer side of the water-blocking layer 313 is wrapped with an outer sheath 325. When the annular waterstop strip 323 absorbs water, there is a gap between the outer sheath 325 and the annular waterstop strip 323 to provide sufficient expansion space for the expansion of the annular waterstop strip 323. The outer sheath 325 is provided with a joint protection assembly 4. The joint protection assembly 4 includes a heat shrinkable sheath 401, an inner shell 402, an inner inlet 403, a drying bag 404, an inner fixing ear 405, a sealing ring 406, a sealing skirt 407, an outer shell 408, a skirt groove 409, a sealing strip 410, a sealing groove 411, an outer fixing ear 412, an arc strip 413, a sealing ring 414, a fixing clamp 415, a support box 416, a threaded cylinder 417, a support plate 418, a support screw 419, and a shock-absorbing pad 420. A heat-shrinkable sheath 401 is provided on the outside of the outer sheath 325. Two inner sheaths 402 are fixed on the outside of the heat-shrinkable sheath 401. An inner opening 403 is provided in the middle of the inner sheath 402. A desiccant 404 is placed inside the inner opening 403. The desiccant 404 is filled with desiccant. The desiccant 404 is made of non-woven fabric and the desiccant is silica desiccant. It can absorb the moisture that enters the outer sheath 325 and ensure the dryness of the space between the outer sheath 408 and the inner sheath 402. It prevents moisture from corroding the cable joint. The two inner sheaths 402 are connected to the inner fixing ears 405 on both sides. The two adjacent inner fixing ears 405 are fixedly connected by bolts. Sealing rings 406 are fixed at both ends of the inner sheath 402 and located outside the outer sheath 325. Sealing skirts 407 are provided at both ends of the outer side of the inner sheath 402. Two outer shells 408 are fixed to the outside of the inner shell 402. Skirt grooves 409 are provided at both ends of the inner shell 408. Sealing skirts 407 are embedded in the adjacent skirt grooves 409. A sealing strip 410 is provided at the joint of one outer shell 408 and a sealing groove 411 is provided at the joint of the other outer shell 408. The sealing strip 410 is embedded in the sealing groove 411. External fixing ears 412 are connected to both sides of the outer shell 408. Two adjacent external fixing ears 412 are fixedly connected by bolts. After the two outer shells 408 are joined and fixed, the sealing strip 410 is also embedded in the sealing groove 411. The cooperation between the sealing strip 410 and the sealing groove 411 can increase the contact area between the two outer shells 408 and improve the sealing performance between the two outer shells 408. The outer shell 408 has arc-shaped strips 413 connected to both ends. The outer sides of the arc-shaped strips 413 at the same end are fixedly connected by fixing clamps 415. A sealing ring 414 is sleeved on the outer side of the outer sleeve 325 inside the arc-shaped strips 413. The arc-shaped strips 413 can tighten and fix the sealing ring 414. The sealing ring 414 is located outside the joint between the outer shell 408 and the outer sleeve 325, and can seal the joint. A support box 416 is provided on the outer side of the outer shell 408. The inner fixing ear 405 is located inside the support box 416. Threaded cylinders 417 are connected to the top and bottom of the support box 416. Support plates 418 are provided on both sides of the bottom of the outer shell 408. Support screws 419 are rotatably connected to both ends of the top of the support plate 418. The top of the support screws 419 is connected to the threaded cylinder 417 at the bottom through a screw hole. During cable laying, the support screws 419 and the support plate 418 can support the outer shell 408 and protect the cable joint. The bottom of the support plate 418 is bonded with a shock-absorbing pad 420. The shock-absorbing pad 420 is made of rubber and can absorb external vibrations, reducing the damage of vibration to the cable joint. During cable laying, the support screws 419 can also be connected to the threaded cylinder 417 at the top of the support box 416. At this time, the support plate 418 plays a hoisting role and is suitable for cable hoisting and laying.

[0021] The working principle and usage process of this invention: When the outer sheath 325 of the cable surface is damaged, when water enters the cable through the damaged area, the water-absorbing sponge pad 316 will quickly absorb the water. Under the action of capillary absorption, the water absorbed by the water-absorbing sponge pad 316 enters the annular cloth bag 321 through the water-absorbing cotton rope 322 and is absorbed by the water-absorbing resin particles. After absorbing water, the water-absorbing resin particles will quickly expand into a gel inside the annular cloth bag 321. The gel-like resin will drive the annular cloth bag 321 to expand quickly and fill the gap between the outer sheath 325 and the water-blocking layer 313 to block the water and prevent water from penetrating along the cable axis. The water-absorbing resin particles absorb water quickly and form a water-blocking gel, which blocks water from penetrating along the cable axis and improves the water-blocking ability of the cable. When the cable is submerged in water, if the damaged area is not repaired promptly during subsequent use, the water-blocking gel can be easily washed away and diluted by the flowing water, reducing the cable's water-blocking performance. The cable is equipped with an annular water-stop strip 323, with multiple water-guiding cotton ropes 324 connected to one end. The tops of the water-guiding cotton ropes 324 are embedded inside adjacent annular bags 321. After the absorbent resin particles in the annular bags 321 absorb water, the absorbed water is absorbed by the annular water-stop strip 323 via the water-guiding cotton ropes 324. The annular water-stop strip 323 is a pre-made expansion water-stop strip, which can expand within 24 hours after absorbing water. While the expansion rate of the annular water-stop strip 323 is not as fast as that of the absorbent resin particles, it does not dissolve or precipitate after long-term immersion in water and is resistant to salt and alkali corrosion. When the damaged area of ​​the cable awaits repair, it ensures the overall water-blocking performance of the cable. The inner sheath 309 of the cable is wrapped with a water-blocking tape 311. When the water-blocking layer 313 is damaged, the water-blocking tape 311 can prevent water from penetrating radially into the cable, further improving the water-blocking performance of the cable. The separator tube 302 and separator arc frame 303 are made of stainless steel. They support and separate each conductor 1, improving the cable's compressive strength. Adjacent separator tubes 302 are connected by multiple connecting steel bars 304. The flexible connecting steel bars 304 connect the separator tubes 302 one by one, ensuring the cable's flexibility. The isolation tube 305 is made of rubber. It separates the connecting steel bars 304 from the insulation layer 2, preventing friction between them. The thermally conductive silicone strip 306, in conjunction with the separator arc frame 303, provides thermal support for each conductor 1. Conductors 1 are separated to prevent squeezing and friction between them. The insulation layer 2 on the outside of each conductor 1 is protected. The thermally conductive silicone strip 306 has a filling channel 307 inside, and a bending spring 308 runs through the filling channel 307. When the cable is subjected to external force, the separating bracket 302 and the separating arc frame 303 improve the support strength of the cable. Combined with the elasticity of the bending spring 308 and the absorption of external force by the thermally conductive silicone strip 306, and the absorption of external force by the protective sponge pad 310 and the water-absorbing sponge pad 316, the cable conductor 1 can be protected in all directions, further improving the cable's compressive strength. The support ribs 301 are made of elastic rubber, and the bending springs 308 are distributed on the outside of the conductor 1. When the cable is bent by external force, the support ribs 301 and the bending springs 308 have good elasticity. When the external force is removed, the cable can quickly return to its original shape, giving the cable good bending resistance. In addition, the thermally conductive silicone strip 306 is made of thermally conductive silicone. The heat generated by the conductor 1 can be conducted to the thermally conductive silicone strip 306, and the heat on the thermally conductive silicone strip 306 can be conducted to the bending springs 308. The cable has sufficient heat dissipation area and good heat dissipation performance. The inner sheath 402 and the outer sheath 408 are made of aluminum, which can protect the cable joint. The inner sheath 402 has an inner opening 403 in the middle, and a desiccant 404 is placed inside the inner opening 403. The desiccant 404 is filled with desiccant and is made of non-woven fabric. The desiccant is silica desiccant, which can absorb the moisture that enters the outer sheath 325, ensure the dryness of the space between the outer sheath 408 and the inner sheath 402, prevent moisture from corroding the cable joint, and ensure the electrical insulation of the cable joint. A sealing ring 414 is fitted onto the outer side of the outer sheath 325, inside the arc-shaped strip 413. The sealing ring 414 is made of elastic rubber. The arc-shaped strip 413 can tighten and fix the sealing ring 414. The sealing ring 414 is located outside the joint between the outer sheath 408 and the outer sheath 325, and can seal the joint to prevent water from entering the joint between the outer sheath 408 and the outer sheath 325. The arc-shaped strip 413 and the sealing ring 414 have good elasticity. When the cable joint is bent, the arc-shaped strip 413 and the sealing ring 414 will provide elastic support between the outer sheath 408 and the outer sheath 325, and transfer the bending force to avoid excessive bending at the joint between the outer sheath 408 and the outer sheath 325. This prevents damage to the joint caused by excessive bending. The cable joint has strong bending resistance. The outer casing 408 has skirt grooves 409 at both ends inside. A sealing skirt 407 is embedded in the adjacent skirt groove 409. One side of the sealing ring 406 is fitted to the sealing skirt 407 and embedded in the skirt groove 409. When water enters the joint between the outer casing 408 and the outer sleeve 325, the sealing skirt 407 and the sealing ring 406 can prevent water from flowing into the outer casing 408. A sealing strip 410 is provided at the joint of one outer casing 408 and at the joint of the other outer casing 408. A sealing groove 411 is provided. After the two outer shells 408 are docked and fixed, the sealing strip 410 is also embedded in the sealing groove 411. The sealing strip 410 and the sealing groove 411 cooperate to increase the contact area between the two outer shells 408, ensuring the sealing performance at the docking point of the outer shells 408. Together with the sealing skirt 407 and the skirt groove 409, the sealing performance of the outer shell 408 is further guaranteed, ensuring the sealing performance at the cable joint position and fully guaranteeing the electrical insulation performance at the cable joint position. During cable laying, the support screw 419 and support plate 418 can support the outer casing 408 and protect the cable joint. The bottom of the support plate 418 is bonded with a shock-absorbing pad 420, which is made of rubber and can absorb external vibrations, reducing the damage of vibration to the cable joint. During cable laying, the support screw 419 can also be connected to the threaded cylinder 417 on the top of the support box 416. At this time, the support plate 418 plays a hoisting role and is suitable for cable hoisting and laying, with a wide range of applications.

[0022] 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 cross-linked polyethylene insulated power cable with a water-blocking structure, comprising a conductor (1), characterized in that, The conductor (1) is provided in four parts, and the conductor (1) is wrapped with an insulating layer (2) on the outside. A water-blocking and bending-resistant component (3) is provided on the outside of the insulating layer (2). The water-blocking and bending-resistant component (3) includes a supporting rib (301). Supporting ribs (301) are provided at the center of the outer side of the four insulating layers (2). Multiple partition tubes (302) are sleeved at equal intervals on the outer side of the supporting ribs (301). Four partition arc frames (303) are evenly arranged on the outer side of the partition tubes (302). The four insulating layers (2) are respectively located in the gap between two adjacent partition arc frames (303). The outer side of the partition arc frame (303) is fitted with an inner sheath (309), the gap inside the inner sheath (309) is filled with a protective sponge pad (310), the outer side of the inner sheath (309) is wrapped with a water-blocking tape (311), the outer side of the water-blocking tape (311) is wrapped with a shielding copper tape (312), and the outer side of the shielding copper tape (312) is wrapped with a water-blocking layer (313). The water-blocking layer (313) has multiple partitioned grooves (314) on its outer side. Four adjacent partitioned grooves (314) in the circumferential direction form a group. The multiple groups of partitioned grooves (314) are distributed at equal intervals on the outer side of the water-blocking layer (313). A water-absorbing sponge pad (316) is placed inside the partitioned groove (314). Each group of partitioned grooves (314) has an inner ring groove (319) and an outer ring groove (320) opened at both ends in sequence. An annular cloth bag (321) is sleeved inside the inner ring groove (319). The annular cloth bag (321) is filled with water-absorbing resin particles. An annular water-stop strip (323) is sleeved inside the outer ring groove (320). A thermally conductive silicone strip (306) is inserted through the partition arc frame (303) located in the same axial position. A filling channel (307) is opened inside the thermally conductive silicone strip (306), and a bending spring (308) is inserted through the filling channel (307). The four adjacent partition slots (314) in the circumferential direction are separated by a partition strip (315). An movable opening (317) is provided between two adjacent partition strips (315). The four adjacent water-guiding sponge pads (316) form a group. The outer side of each group of water-guiding sponge pads (316) is fixed by several rubber band rings (318). The rubber band rings (318) are embedded in the movable opening (317). One end of the annular cloth bag (321) is connected to a plurality of absorbent cotton ropes (322), the absorbent cotton ropes (322) are embedded in one end of an adjacent water-absorbing sponge pad (316), and one end of the annular water-stop strip (323) is connected to a plurality of water-absorbing cotton ropes (324), the top of the water-absorbing cotton ropes (324) is embedded in the interior of an adjacent annular cloth bag (321); The water-blocking layer (313) is wrapped with an outer sheath (325), and there is a gap between the outer sheath (325) and the annular water-stop strip (323).

2. The cross-linked polyethylene insulated power cable with a water-blocking structure according to claim 1, characterized in that, Two adjacent partition tubes (302) are connected by multiple connecting steel bars (304), and an isolation tube (305) is sleeved on the outside of the connecting steel bars (304) between two adjacent partition tubes (302).

3. A cross-linked polyethylene insulated power cable with a water-blocking structure according to claim 1, characterized in that, The outer sheath (325) is provided with a connector protection component (4), which includes a heat shrink sheath (401). The outer sheath (325) is provided with a heat shrinkable sheath (401) on the outside. Two inner shells (402) are fixed on the outside of the heat shrinkable sheath (401). Sealing rings (406) are fixed at both ends of the inner shells (402) and located outside the outer sheath (325). Sealing skirts (407) are provided at both ends of the outer side of the inner shells (402). Two outer shells (408) are fixed on the outside of the inner shell (402). Skirt grooves (409) are provided at both ends of the inner shell (408). The sealing skirt (407) is embedded in the adjacent skirt groove (409). The outer shell (408) is connected to two ends with arc-shaped strips (413). The outer side of the arc-shaped strips (413) located at the same end is fixedly connected by a fixing hoop (415). The outer sleeve (325) is fitted with a sealing ring (414) on the inner side of the arc-shaped strips (413).

4. A cross-linked polyethylene insulated power cable with a water-blocking structure according to claim 3, characterized in that, The inner shell (402) has an inner opening (403) in the middle, and a desiccant is placed inside the inner opening (403). The inner shell (404) is filled with desiccant. The two inner shells (402) are connected to the inner fixing ears (405) on both sides, and the two adjacent inner fixing ears (405) are fixedly connected by bolts.

5. A cross-linked polyethylene insulated power cable with a water-blocking structure according to claim 3, characterized in that, A sealing strip (410) is provided at the joint of one of the outer shells (408), and a sealing groove (411) is provided at the joint of the other outer shell (408). The sealing strip (410) is embedded in the sealing groove (411). External fixing ears (412) are connected to both sides of the outer shell (408), and two adjacent external fixing ears (412) are fixedly connected by bolts.

6. A cross-linked polyethylene insulated power cable with a water-blocking structure according to claim 4, characterized in that, A support box (416) is provided on the outside of the outer shell (408). The inner fixing ear (405) is located inside the support box (416). Threaded cylinders (417) are connected to the top and bottom of the support box (416). Support plates (418) are provided on both sides of the bottom of the outer shell (408). Support screws (419) are rotatably connected to the top two ends of the support plate (418). The top of the support screws (419) is connected to the threaded cylinders (417) located at the bottom through screw holes. Shock-absorbing pads (420) are adhered to the bottom of the support plate (418).

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