220kv submarine cable against seawater corrosion

Abstract

The application discloses a 220kV submarine cable capable of preventing seawater corrosion and relates to the technical field of cables. An outer protective support assembly is arranged on the outer side of an insulating isolation layer, an armor layer is wrapped on the outer side of the insulating isolation layer, mark grooves are uniformly arranged on the outer side of an expansion layer, a spiral support ring is inlaid on the outer side of an insulating anticorrosion layer, a positioning ring is fixedly sleeved in a fixing groove, an annular buffer net is welded on the outer side of a buffer swivel, foam plastic strips are uniformly filled in the mark grooves, and drive balls are uniformly filled in drive grooves. When the cable is shifted, the annular buffer net is rolled up and has more elasticity, the capacity of absorbing impact is better, the damage of the insulating anticorrosion layer is further avoided, the expansion layer is expanded by absorbing water, the damaged position is extruded, the speed of seawater penetrating into the cable is slowed down, the foam plastic strips and the drive balls diffuse along the damaged position and flow out, the damaged area can be marked after the submarine cable is damaged, and the damaged position can be quickly determined by maintenance personnel for repair.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a 220kV submarine cable designed to prevent seawater corrosion. Background Technology

[0002] Submarine cables are conductors wrapped in insulated materials and laid on the seabed to establish telecommunications transmission between regions. Submarine cables are an important infrastructure supporting global data exchange and are the most important information carriers in modern international communication. Under normal circumstances, it is undoubtedly more expensive to use submarine cables to transmit electrical energy than overhead cables of the same length, but it is often more economical than using small and isolated power plants for regional power generation. It has more advantages in coastal areas and is more widely used in countries and regions with many islands and rivers.

[0003] However, submarine cables currently on the market, especially those in shallow sea areas, are more susceptible to damage from human activities such as ships and fishing due to their shallow burial depth. They are also susceptible to damage from shark bites. During the pulling process, the outer side of the cable may rub against the protruding rock bed on the seabed, causing it to break and resulting in the outer insulation layer breaking and reducing its service life. Summary of the Invention

[0004] This invention provides a 220kV submarine cable that is resistant to seawater corrosion, which can effectively solve the problem mentioned in the background art where the cable breaks due to friction between the outer side of the cable and the protruding rock bed on the seabed, resulting in the breakage of the outer insulation layer and a reduction in its service life.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a kV submarine cable for preventing seawater corrosion, comprising an insulating isolation layer, wherein an outer protective support assembly is provided on the outside of the insulating isolation layer, and the outer protective support assembly comprises an armor layer;

[0006] The insulating layer is wrapped with an armor layer on the outside, and the armor layer is wrapped with an expansion layer on the outside. Marking grooves are evenly distributed on the outside of the expansion layer, and a repellent groove is distributed on one side of the expansion layer at the marking groove.

[0007] The expansion layer is wrapped with an insulating and anti-corrosion layer. A spiral support ring is embedded on the outside of the insulating and anti-corrosion layer. Fixed grooves are evenly opened on the outside of the insulating and anti-corrosion layer. A positioning ring is fixedly sleeved inside the fixed groove. A buffer ring is rotatably sleeved on the outside of the positioning ring. An annular buffer net is welded to the outside of the buffer ring. An annular expansion bag is filled inside the annular buffer net.

[0008] According to the above technical solution, the marking groove is uniformly filled with foam plastic strips, the top surface of the foam plastic strips is provided with a dyeing groove, the dyeing groove is filled with a dyeing bag, the top surface of the dyeing bag is bonded with a heat-absorbing strip, the bottom surface of the foam plastic strips is inlaid with a zinc strip, and the repelling groove is uniformly filled with repelling balls.

[0009] According to the above technical solution, the longitudinal sections of the marking groove and the driving groove are both semi-circular, one side of the foam plastic strip is an arc shape that fits the marking groove, and the inside of the foam plastic strip is hollow.

[0010] According to the above technical solution, the armor layer is spiral-shaped, and the bottom part of the expansion layer is embedded in the gap of the armor layer.

[0011] According to the above technical solution, the positioning ring and the fixing groove are connected by interference fit, the outer diameter of the positioning ring is larger than the diameter of the insulating and anti-corrosion layer, the buffer rotating ring and the positioning ring are connected by transition fit, and the annular expansion bag is filled with water-absorbing resin particles.

[0012] According to the above technical solution, an inner filling component is uniformly disposed inside the insulating isolation layer, and the inner filling component includes an inner conductor;

[0013] The inner conductor is wrapped with a thermally conductive foamed silicone layer, the thermally conductive foamed silicone layer is wrapped with an inner armor layer, the inner armor layer is wrapped with a thermally conductive insulating layer, and the insulating layer is filled with a deformation filler layer.

[0014] A data transmission line is provided on the side of the deformation filling layer near the inner conductor. Fission grooves are uniformly formed on the outer side of the deformation filling layer. Expandable silicone tubes are uniformly filled inside the fission grooves. An annular connecting tube is sleeved on the outer side of three expandable silicone tubes located on the same plane. Ventilation holes are formed inside the annular connecting tubes corresponding to the expandable silicone tubes. Expandable adhesive strips are interlaced inside the annular connecting tubes. An annular snap-fit ​​groove is formed on the outer side of the deformation filling layer corresponding to the annular connecting tube.

[0015] According to the above technical solution, a reinforced heat-conducting pipe is installed through the middle of the deformation filling layer, and arc-shaped heat-conducting sheets are evenly distributed on the outside of the reinforced heat-conducting pipe. The inside of the reinforced heat-conducting pipe is evenly and alternately filled with water-absorbing resin blocks and expanding rubber blocks.

[0016] According to the above technical solution, one side of the arc-shaped heat-conducting sheet is attached to the outer side of the heat-conducting insulation layer, and the end faces of the water-absorbing resin block and the expanding rubber block are both semi-circular rings.

[0017] According to the above technical solution, the included angle between the two sides of the fission groove is an acute angle, and the side of the expanding silicone tube near the insulating layer is curved.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. Equipped with external protective support components, in shallow sea areas, if the cable shifts, the buffer ring and annular buffer net outside the positioning ring will rotate. If there are many protruding rocks, the annular expansion bag inside the annular buffer net will be damaged by continuous impact. The water-absorbing resin inside will expand and partially seep through the gaps in the annular buffer net, making the annular buffer net bulge and more elastic, with better shock absorption capacity, further preventing damage to the insulation and anti-corrosion layer. The spiral support ring improves the strength of the insulation and anti-corrosion layer, maintains the integrity of the outer side, and the insulation and anti-corrosion layer is made of high-density polyethylene, which has strong corrosion resistance, preventing damage to the submarine cable and extending its service life.

[0020] If a submarine cable experiences minor cracks in its insulation and corrosion protection layer due to anchor damage or shark bites, the expansion layer absorbs water and expands, compressing the damaged area and slowing the rate at which seawater penetrates the cable. The expanding layer also enlarges the marking and repellent channels, allowing foam strips and repellent balls to spread out along the damaged area. After the foam strips float on the surface, the dark-colored heat-absorbing strips absorb heat, accelerating the decomposition of the foam strips and dye bags. The seawater dye in the dye bags flows out. The decomposition time of the dye bags and the retention time of the seawater dye can be used to mark the damaged area after a submarine cable break, allowing maintenance personnel to quickly pinpoint the damage for repair. Furthermore, the repellent balls, primarily composed of natural extracts, repel nearby sharks, preventing further bites and facilitating cable retrieval for maintenance personnel.

[0021] 2. An internal filling component is provided. If the submarine cable is severely damaged, seawater will seep into the internal filling component. The expansion silicone tube at the location where seawater seeps in will expand and squeeze the expansion fission groove. The expansion silicone tube in the fission groove at other locations will be squeezed and contracted, and the fission groove will be squeezed and shrunken. The inner conductor will shift away from the damaged location as the deformation filling layer deforms, reducing the chance of the cable coming into contact with seawater.

[0022] The reinforced heat-conducting pipe enhances the overall strength of the cable while also relying on the arc-shaped heat-conducting sheet to transfer heat. The heat from the inner conductor is transferred to the arc-shaped heat-conducting sheet through the thermally conductive foamed silicone layer, inner armor layer, and thermally conductive insulation layer, and then carried away by the air flowing inside the reinforced heat-conducting pipe, balancing the heat inside the cable and preventing overheating. In addition, the thermally conductive foamed silicone layer reduces the overall density of the cable, making it lighter and easier to lay. If the cable breaks and water enters the reinforced heat-conducting pipe, the expanding rubber block will absorb water and expand, blocking the water ingress and preventing further water seepage damage.

[0023] The outer protective support component buffers and prevents friction damage, protecting cables in shallow waters, especially on seabeds. It also temporarily blocks seawater infiltration when the cable is only slightly damaged, ensuring its normal operation. The inner filling component, when the cable is more severely damaged, pushes the inner conductor to shift and blocks seawater infiltration again, improving the protective effect and effectively enhancing the cable's protective performance, thus preventing the inner conductor from being damaged by seawater corrosion. Attached Figure Description

[0024] 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.

[0025] In the attached diagram:

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the external protective support component of the present invention;

[0028] Figure 3 This is the present invention. Figure 2 A schematic diagram of the structure of region A;

[0029] Figure 4 This is a schematic diagram of the installation structure of the positioning ring of the present invention;

[0030] Figure 5 This is a schematic diagram of the internal filling component of the present invention;

[0031] Figure 6 This is the present invention. Figure 5 A schematic diagram of the structure of region A;

[0032] Figure 7 This is a schematic diagram of the expansion silicone tube installation structure of the present invention;

[0033] Figure 8 This is a schematic diagram of the installation structure of the expanded rubber block of the present invention;

[0034] Labels in the diagram: 1. Insulating layer;

[0035] 2. External protective support components; 201. Armor layer; 202. Expansion layer; 203. Marking groove; 204. Repellent groove; 205. Foam strip; 206. Dyeing tank; 207. Dyeing bag; 208. Heat-absorbing strip; 209. Zinc strip; 210. Repellent ball; 211. Insulating and anti-corrosion layer; 212. Spiral support ring; 213. Fixing groove; 214. Positioning ring; 215. Buffer swivel ring; 216. Annular buffer net; 217. Annular expansion bag;

[0036] 3. Internal filling components; 301. Inner conductor; 302. Thermally conductive foamed silicone layer; 303. Inner armor layer; 304. Thermally conductive insulation layer; 305. Deformation filling layer; 306. Reinforced heat-conducting pipe; 307. Arc-shaped heat-conducting sheet; 308. Water-absorbing resin block; 309. Expanded rubber block; 310. Data transmission line; 311. Fission groove; 312. Expanded silicone tube; 313. Annular connecting pipe; 314. Ventilation hole; 315. Expanded rubber strip; 316. Annular snap-fit ​​groove. Detailed Implementation

[0037] 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.

[0038] Example: Figure 1-8 As shown, the present invention provides a technical solution for preventing seawater corrosion of a 220kV submarine cable, including an insulating isolation layer 1, an outer protective support assembly 2 provided on the outside of the insulating isolation layer 1, the outer protective support assembly 2 including an armor layer 201, an expansion layer 202, a marking groove 203, a repellent groove 204, a foam plastic strip 205, a dyeing groove 206, a dyeing bag 207, a heat-absorbing strip 208, a zinc strip 209, a repellent ball 210, an insulating and anti-corrosion layer 211, a spiral support ring 212, a fixing groove 213, a positioning ring 214, a buffer swivel ring 215, an annular buffer net 216, and an annular expansion bag 217;

[0039] An insulating layer 1 is wrapped with an armor layer 201, and an expansion layer 202 is wrapped with the armor layer 201. The armor layer 201 is spiral-shaped, and the bottom part of the expansion layer 202 is embedded into the gap of the armor layer 201 to seal the gap and improve the water-blocking ability. Marking grooves 203 are evenly distributed on the outer side of the expansion layer 202, and a repellent groove 204 is distributed on one side of the expansion layer 202 with the marking grooves 203. Foam plastic strips 205 are evenly filled inside the marking grooves 203, and a dyeing groove 206 is distributed on the top surface of the foam plastic strips 205. The dyeing trough 206 is filled with a dyeing bag 207. A heat-absorbing strip 208 is attached to the top surface of the dyeing bag 207. A zinc strip 209 is embedded in the bottom surface of the foam plastic strip 205. The repelling trough 204 is filled with repelling balls 210 to mark the damaged location and repel fish that bite the cable. The longitudinal section of the marking trough 203 and the repelling trough 204 are both semi-circular. One side of the foam plastic strip 205 is an arc shape that fits the marking trough 203. The inside of the foam plastic strip 205 is hollow so that the foam plastic strip 205 can be pushed out when the expansion layer 202 expands.

[0040] An insulating and anti-corrosion layer 211 is wrapped around the outside of the expansion layer 202. A spiral support ring 212 is embedded on the outside of the insulating and anti-corrosion layer 211. Fixed grooves 213 are evenly opened on the outside of the insulating and anti-corrosion layer 211. A positioning ring 214 is fixedly sleeved inside the fixed groove 213. A buffer ring 215 is rotatably sleeved on the outside of the positioning ring 214. An annular buffer net 216 is welded to the outside of the buffer ring 215. An annular expansion bag 217 is filled inside the annular buffer net 216. The positioning ring 214 and the fixed groove 213 are connected by an interference fit. The outer diameter of the positioning ring 214 is larger than the diameter of the insulating and anti-corrosion layer 211. The buffer ring 215 and the positioning ring 214 are connected by a transition fit. The annular expansion bag 217 is filled with water-absorbing resin particles to facilitate the rotation of the annular buffer net 216 outside the positioning ring 214.

[0041] The insulating layer 1 is uniformly filled with an inner filling component 3, which includes an inner conductor 301, a thermally conductive foamed silicone layer 302, an inner armor layer 303, a thermally conductive insulating layer 304, a deformation filling layer 305, a reinforced thermally conductive pipe 306, an arc-shaped thermally conductive sheet 307, a water-absorbing resin block 308, an expanding rubber block 309, a data transmission line 310, a fission groove 311, an expanding silicone tube 312, an annular connecting tube 313, a ventilation hole 314, an expanding rubber strip 315, and an annular snap-fit ​​groove 316.

[0042] The inner conductor 301 is wrapped with a thermally conductive foamed silicone layer 302. The thermally conductive foamed silicone layer 302 is wrapped with an inner armor layer 303. The inner armor layer 303 is wrapped with a thermally conductive insulating layer 304. The insulating layer 1 is filled with a deformation filling layer 305. A reinforced heat-conducting pipe 306 is installed through the middle of the deformation filling layer 305. Arc-shaped heat-conducting sheets 307 are evenly distributed on the outside of the reinforced heat-conducting pipe 306. Water-absorbing resin blocks 308 and expanding rubber blocks 309 are evenly and alternately filled inside the reinforced heat-conducting pipe 306. One side of the arc-shaped heat-conducting sheet 307 is attached to the outside of the thermally conductive insulating layer 304. The end faces of the water-absorbing resin block 308 and the expanding rubber block 309 are both semi-circular rings. The water-absorbing resin block 308 quickly absorbs water and expands to temporarily block and facilitate the expansion of the expanding rubber block 309.

[0043] A data transmission line 310 is provided on the side of the deformation filling layer 305 near the inner conductor 301. Fission grooves 311 are uniformly formed on the outer side of the deformation filling layer 305. The included angle between the two sides of the fission grooves 311 is an acute angle. The side of the expansion silicone tube 312 near the insulating layer 1 is curved, which facilitates the fission grooves 311 being pushed open by the expansion silicone tubes 312, preventing water seepage at the rupture location. The fission grooves 311 are uniformly filled with expansion silicone tubes 312. An annular connecting tube 313 is sleeved on the outer side of three expansion silicone tubes 312 located on the same plane. Ventilation holes 314 are formed inside the annular connecting tube 313 corresponding to the expansion silicone tubes 312. Expansion strips 315 are interlaced inside the annular connecting tube 313. An annular snap-fit ​​groove 316 is formed on the outer side of the deformation filling layer 305 corresponding to the annular connecting tube 313.

[0044] The working principle and usage process of this invention are as follows: The outer side of the inner conductor 301 is wrapped with a thermally conductive foamed silicone layer 302 via an extruder. Then, an inner armor layer 303 is wrapped around the outer side of the thermally conductive foamed silicone layer 302. The outer side of the inner armor layer 303 is wrapped with a thermally conductive insulating layer 304 via an extruder. The thermally conductive insulating layer 304 is made of high-density polyethylene. Arc-shaped thermally conductive sheets 307 are distributed on the outer side of the reinforced thermally conductive tube 306. The reinforced thermally conductive tube 306 is made of spring steel. Arc-shaped thermally conductive sheets 307 are temporarily bonded to the outer side of the reinforced thermally conductive tube 306. The arc-shaped thermally conductive sheets 307 are made of aluminum alloy with excellent thermal conductivity. The thermally conductive insulating layer 304 is temporarily bonded and fixed to the outer side of the arc-shaped thermally conductive sheets 307. Data transmission lines 310 are arranged in the gaps between the thermally conductive insulating layers 304. A deformation filling layer 305, made of low-density polyethylene, is wrapped around the outer side via an extruder. A fission groove 3... 11 is filled with an expansion silicone tube 312 and a fixed annular connecting tube 313 is sleeved and fixed in the annular snap-fit ​​groove 316. The ventilation hole 314 is aligned with the expansion silicone tube 312. The insulating isolation layer 1 is wrapped with an asphalt waterproof layer. The outer side of the insulating isolation layer 1 is wrapped with an armor layer 201. The outer side of the armor layer 201 is wrapped with an expansion layer 202. The expansion layer 202 is water-swellable rubber. Foam plastic strips 205 are embedded in the dyeing tank 206. After the dyeing bag 207 is embedded in the dyeing tank 206, an insulating and anti-corrosion layer 211 is wrapped with a high-density polyethylene layer. Finally, the assembled positioning rings 214 are sleeved at equal intervals on the outer side of the insulating and anti-corrosion layer 211 to complete the production operation of the submarine cable. The positioning rings 214, buffer swivels 215 and annular buffer nets 216 are all made of corrosion-resistant stainless steel.

[0045] After cable laying, in shallow sea areas, if the cable is laid on a rock bed that cannot be buried, it may shift due to collisions with ships, fishing nets, etc. The buffer ring 215 and the annular buffer net 216 outside the positioning ring 214 will rotate, and the cable will move horizontally along the seabed rock bed, preventing the cable from rolling and rubbing against the seabed rock bed and damaging the outer insulating and anti-corrosion layer 211. Furthermore, if there are many protruding rocks, the annular expansion bag 217 inside the annular buffer net 216 will be damaged by continuous impacts. The annular expansion bag 217 is made of high-density polyethylene, which is resistant to seawater corrosion but can also rupture. The material is then stored inside the annular buffer net 216, which will not cause plastic pollution. After the annular expansion bag 217 ruptures, the water-absorbing resin inside will expand and partially seep out through the gaps in the annular buffer net 216, making the annular buffer net 216 bulge and more elastic, with better shock absorption capacity, further preventing damage to the insulation and anti-corrosion layer 211. The spiral support ring 212 improves the strength of the insulation and anti-corrosion layer 211, maintains the integrity of the outer side, and the insulation and anti-corrosion layer 211 is made of high-density polyethylene, which has strong corrosion resistance, preventing damage to the submarine cable and extending its service life.

[0046] If the submarine cable experiences minor cracks in the insulation and anti-corrosion layer 211 due to anchor damage or shark bites, the armor layer 201 provides support, mitigating the damage. Simultaneously, the expansion layer 202 absorbs water and expands, compressing the damaged area and slowing the rate at which seawater penetrates the cable. The expanding expansion layer 202 also enlarges the marking groove 203 and the repellent groove 204. The foam strip 205 and the repellent ball 210 diffuse out along the damaged area. Under its own buoyancy and the counterweight of the zinc strip 209, the foam strip 205 floats upwards in the dyeing groove 206 until it reaches the surface. The zinc strip 209 reacts with the seawater, slowly generating a small amount of hydrogen gas, accelerating the buoyancy of the foam strip 205. After floating on the water surface, both the foam plastic strip 205 and the dye bag 207 are made of biodegradable plastic. The heat-absorbing strip 208 is a dark-colored plastic sheet that absorbs heat and accelerates the decomposition of the foam plastic strip 205 and the dye bag 207. The seawater dye in the dye bag 207 flows out. The decomposition time of the dye bag 207 and the retention time of the seawater dye can mark the damaged area after the submarine cable is damaged, so that maintenance personnel can quickly determine the location of the damage for repair. The main component of the repellent ball 210 is a natural extract repellent, which repels nearby sharks and prevents them from biting the cables. It also makes it easier for maintenance personnel to pull up the cables for repair. The natural extract repellent is selected from natural plant extracts such as capsaicin, eugenol, citral, and allicin.

[0047] If the submarine cable armor layer 201 is also damaged, and the damage is relatively serious, seawater will seep into the inner filling component 3. The expansion silicone tube 312 at the location where seawater seeps in will expand and squeeze the expansion fission groove 311. The expansion silicone tube 312 in the fission groove 311 at other locations will be squeezed and contracted, and the fission groove 311 will be squeezed and shrunken. Meanwhile, the expansion rubber strip 315 in the annular connecting pipe 313 near the expansion silicone tube 312 will absorb water and block the annular connecting pipe 313, separating the water-absorbing expansion silicone tube 312 from the other dry water-absorbing expansion silicone tubes 312, preventing the expansion silicone tubes 312 at other locations from absorbing water and expanding. The inner conductor 301 will shift away from the damaged location as the deformation filling layer 305 deforms, reducing the probability of the cable coming into contact with seawater.

[0048] The reinforced heat-conducting pipe 306 strengthens the overall strength of the cable and also relies on the arc-shaped heat-conducting plate 307 to transfer heat. The heat of the inner conductor 301 is transferred to the arc-shaped heat-conducting plate 307 through the thermally conductive foamed silicone layer 302, the inner armor layer 303 and the thermally conductive insulation layer 304, and then carried away by the air flowing inside the reinforced heat-conducting pipe 306, balancing the heat inside the cable and preventing the cable from overheating. In addition, the thermally conductive foamed silicone layer 302 reduces the overall density of the cable, making the cable lighter and easier to lay. If the cable breaks and water enters the reinforced heat-conducting pipe 306, the expanding rubber block 309 will absorb water and expand, blocking the water inlet and preventing further water seepage damage.

[0049] The outer protective support component 2 buffers and prevents friction damage, ensuring the cable's protection in shallow waters, especially on seabed rocky areas, and temporarily blocks seawater infiltration when the cable is only slightly damaged, thus ensuring its normal operation. The inner filling component 3, when the cable is more severely damaged, pushes the inner conductor 301 to move and blocks seawater inflow again, improving the protective effect and effectively enhancing the cable's protective performance, thus preventing the inner conductor 301 from being damaged by seawater corrosion.

[0050] 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 220 kV submarine cable against seawater corrosion, comprising an insulating isolation layer (1), characterized in that: An outer protective support assembly (2) is provided on the outside of the insulating isolation layer (1), and the outer protective support assembly (2) includes an armor layer (201). The insulating isolation layer (1) is wrapped with an armor layer (201) on the outside, and an expansion layer (202) is wrapped with an expansion layer (202) on the outside. Marking grooves (203) are evenly opened on the outside of the expansion layer (202), and a driving groove (204) is opened on one side of the marking groove (203) of the expansion layer (202). The expansion layer (202) is wrapped with an insulating and anti-corrosion layer (211) on the outside. A spiral support ring (212) is embedded on the outside of the insulating and anti-corrosion layer (211). A fixing groove (213) is evenly opened on the outside of the insulating and anti-corrosion layer (211). A positioning ring (214) is fixedly sleeved inside the fixing groove (213). A buffer ring (215) is rotatably sleeved on the outside of the positioning ring (214). An annular buffer net (216) is welded on the outside of the buffer ring (215). An annular expansion bag (217) is filled inside the annular buffer net (216). The marking groove (203) is uniformly filled with foam plastic strips (205), the top surface of the foam plastic strips (205) is provided with a dyeing groove (206), the dyeing groove (206) is filled with a dyeing bag (207), the top surface of the dyeing bag (207) is bonded with a heat-absorbing strip (208), the bottom surface of the foam plastic strips (205) is inlaid with a zinc strip (209), and the driving groove (204) is uniformly filled with driving balls (210).

2. The 220 kV submarine cable for preventing seawater corrosion according to claim 1, wherein The longitudinal section of the marking groove (203) and the driving groove (204) is semi-circular. One side of the foam plastic strip (205) is an arc shape that fits the marking groove (203). The inside of the foam plastic strip (205) is hollow.

3. The 220 kV submarine cable for preventing seawater corrosion according to claim 1, wherein The armor layer (201) is spiral-shaped, and the bottom part of the expansion layer (202) is embedded in the gap of the armor layer (201).

4. A 220kV submarine cable for preventing seawater corrosion according to claim 1, characterized in that, The positioning ring (214) and the fixing groove (213) are connected by interference fit. The outer diameter of the positioning ring (214) is larger than the diameter of the insulating and anti-corrosion layer (211). The buffer rotating ring (215) and the positioning ring (214) are connected by transition fit. The annular expansion bag (217) is filled with water-absorbing resin particles.

5. The 220 kV submarine cable for preventing seawater corrosion according to claim 1, wherein The insulating layer (1) is uniformly provided with an inner filling component (3), and the inner filling component (3) includes an inner conductor (301). The inner conductor (301) is wrapped with a thermally conductive foamed silicone layer (302), the thermally conductive foamed silicone layer (302) is wrapped with an inner armor layer (303), the inner armor layer (303) is wrapped with a thermally conductive insulating layer (304), and the insulating isolation layer (1) is filled with a deformation filling layer (305). A data transmission line (310) is provided on the side of the deformation filling layer (305) near the inner conductor (301). A fission groove (311) is uniformly opened on the outer side of the deformation filling layer (305). An expansion silicone tube (312) is uniformly filled inside the fission groove (311). An annular connecting tube (313) is sleeved on the outer side of three expansion silicone tubes (312) located on the same plane. A ventilation hole (314) is opened inside the annular connecting tube (313) corresponding to the expansion silicone tube (312). An expansion adhesive strip (315) is interlaced inside the annular connecting tube (313). An annular snap-fit ​​groove (316) is opened on the outer side of the deformation filling layer (305) corresponding to the annular connecting tube (313).

6. The 220 kV submarine cable for preventing seawater corrosion according to claim 5, wherein A reinforced heat-conducting pipe (306) is installed through the middle of the deformable filling layer (305). Arc-shaped heat-conducting sheets (307) are evenly distributed on the outside of the reinforced heat-conducting pipe (306). Water-absorbing resin blocks (308) and expanding rubber blocks (309) are evenly and alternately filled inside the reinforced heat-conducting pipe (306).

7. The 220 kV submarine cable for preventing seawater corrosion according to claim 6, wherein The arc-shaped heat-conducting sheet (307) is attached to the outer side of the heat-conducting insulation layer (304) on one side, and the end faces of the water-absorbing resin block (308) and the expanding rubber block (309) are both semi-circular rings.

8. A 220kV submarine cable for preventing seawater corrosion according to claim 5, characterized in that, The fission groove (311) has an acute angle between its two sides, and the expansion silicone tube (312) has a curved surface on the side near the insulating layer (1).

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