220kV submarine cable capable of preventing seawater corrosion

Abstract

The invention discloses a 220kV submarine cable capable of preventing seawater corrosion, and relates to the technical field of cables, the outer side of an insulation isolation layer is provided with an outer protection support assembly, the outer side of the insulation isolation layer is wrapped with an armor layer, the outer side of an expansion layer is uniformly provided with mark grooves, the outer side of an insulation anti-corrosion layer is embedded with a spiral support ring, and a positioning ring is fixedly sleeved in a fixing groove. According to the cable, when the cable moves, the annular buffer net bulges and rolls, is more elastic and has better impact absorption capacity, the damage of the insulating anti-corrosion layer is further avoided, the expansion layer is further prevented from absorbing water and expanding, and the cable is prevented from being damaged. The damaged position is extruded, the speed of seawater permeating into the cable is reduced, the foam plastic strip and the driving ball diffuse and flow out along the damaged position, and the damaged area can be marked after the submarine cable is damaged, so that maintenance personnel can quickly determine the damaged position for repairing.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, in particular to a 220kV submarine cable capable of preventing seawater corrosion. Background Art

[0002] Submarine cables are conductors wrapped in insulating material, laid on the seabed, and used to establish telecommunications transmission between regions. Submarine cables are important infrastructure supporting global data exchanges and are the most important information carriers for contemporary international communications. Under normal circumstances, the use of submarine cables to transmit electricity is undoubtedly more expensive than overhead cables of the same length, but using them is often more economical than using small and isolated power stations for regional power generation. There are more benefits in offshore areas and such cables are widely used in countries with more islands and rivers.

[0003] However, submarine cables currently on the market, especially those in shallow waters, are more easily damaged by human activities such as ships and fishing due to their shallow burial depths. They are also susceptible to damage from shark bites. During the pulling process, the outer side of the cable rubs against the protruding rock bed on the seabed, causing breakage, which in turn breaks the outer insulation layer and reduces its service life. Summary of the Invention

[0004] The present invention provides a 220kV submarine cable that is resistant to seawater corrosion, which can effectively solve the problem in the above background technology that the outer side of the cable is broken by friction with the protruding rock bed on the seabed, resulting in the breakage of the outer insulation layer and the reduction of its service life.

[0005] To achieve the above object, the present invention provides the following technical solution: a kV submarine cable for preventing seawater corrosion, comprising an insulating isolation layer, an outer protective support assembly is provided on the outer side of the insulating isolation layer, and the outer protective support assembly includes an armor layer; The outer side of the insulating isolation layer is wrapped with an armor layer, the outer side of the armor layer is wrapped with an expansion layer, the outer side of the expansion layer is evenly provided with marking grooves, and the expansion layer is provided with a driving groove on one side of the marking groove; The outside of the expansion layer is wrapped with an insulating anti-corrosion layer, the outside of the insulating anti-corrosion layer is inlaid with a spiral support ring, the outside of the insulating anti-corrosion layer is evenly provided with fixing grooves, a positioning ring is fixedly sleeved inside the fixing groove, a buffer swivel is rotatably sleeved on the outside of the positioning ring, an annular buffer net is welded on the outside of the buffer swivel, and the inside of the annular buffer net is filled with an annular expansion bag.

[0006] According to the above technical solution, the inside of the marking groove is evenly filled with foam plastic strips, the top surface of the foam plastic strips is provided with a dyeing groove, the inside of 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 inside of the marking groove is evenly filled with driving balls.

[0007] According to the above technical solution, the marking groove and the longitudinal section of the marking groove are both semicircular, one side of the foam plastic strip is an arc shape that fits the marking groove, and the interior of the foam plastic strip is hollow.

[0008] According to the above technical solution, the armor layer is spiral-shaped, and the bottom surface of the expansion layer is partially embedded in the gap of the armor layer.

[0009] 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 anti-corrosion layer, the buffer swivel and the positioning ring are connected by transition fit, and the annular expansion bag is filled with water-absorbing resin particles.

[0010] According to the above technical solution, the inner filling component is evenly arranged inside the insulating isolation layer, and the inner filling component includes an inner conductor; The outer side of the inner wire is wrapped with a heat-conducting foamed silicone layer, the outer side of the heat-conducting foamed silicone layer is wrapped with an inner armor layer, the outer side of the inner armor layer is wrapped with a heat-conducting insulating layer, and the interior of the insulating isolation layer is filled with a deformable filling layer; A data transmission line is provided on the side of the deformable filling layer close to the inner conductor, fission grooves are evenly provided on the outside of the deformable filling layer, and the inside of the fission grooves is evenly filled with expansion silicone tubes. An annular connecting tube is sleeved on the outside of the three expansion silicone tubes located in the same plane, and ventilation holes are provided in the annular connecting tubes corresponding to the expansion silicone tubes. Expansion strips are staggered and bonded in the annular connecting tubes, and an annular clamping groove is provided on the outside of the deformable filling layer corresponding to the annular connecting tubes.

[0011] According to the above technical solution, a reinforced heat pipe is installed through the middle of the deformable filling layer, arc-shaped heat conducting sheets are evenly distributed on the outside of the reinforced heat pipe, and the inside of the reinforced heat pipe is evenly and alternately filled with water-absorbing resin blocks and expanded rubber blocks.

[0012] 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 insulating layer, and the end faces of the water-absorbing resin block and the expansion rubber block are both semicircular.

[0013] According to the above technical solution, the angles between the two side surfaces of the fission groove are acute, and the side of the expandable silicone tube close to the insulating isolation layer is a curved surface.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. An external protective support assembly is provided. In shallow waters, if the cable shifts, the buffer swivel and annular buffer net on the outside of the positioning ring will rotate. If there are many protruding rocks, the annular expansion bag in the annular buffer net will be damaged by continuous collision. The internal water-absorbing resin 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 ability, further preventing damage to the insulation anti-corrosion layer. The spiral support ring improves the strength of the insulation anti-corrosion layer and maintains the integrity of the outer side. The insulation anti-corrosion layer is made of high-density polyethylene, which is inherently corrosion-resistant, thus preventing damage to the submarine cable and extending its service life. If the insulating anti-corrosion layer of the submarine cable is slightly cracked due to the bite of a ship anchor or a shark, the expansion layer will absorb water and expand, squeezing the damaged area and slowing down the rate at which seawater penetrates into the cable. The expanded expansion layer will expand the marking groove and the repelling groove, and the foam plastic strips and repelling balls will diffuse and flow out along the damaged area. After the foam plastic strips float on the water surface, the heat-absorbing strips are dark-colored sheets that absorb heat, accelerating the decomposition of the foam plastic strips and the dye bag, and the seawater dye in the dye bag flows out. The decomposition time of the dye bag 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 damaged location for repair. The main ingredient of the repelling ball is a natural extract repellent, which drives away nearby sharks, preventing subsequent bites by sharks while also making it convenient for maintenance personnel to pull up the cable for repairs.

[0015] 2. An inner filling component is provided. If the submarine cable is severely damaged, seawater will penetrate into the inner filling component. The expansion silicone tube at the position where the seawater has penetrated will expand and squeeze the fission groove. The expansion silicone tubes in the fission grooves at other positions will be squeezed and contracted, and the fission grooves will be squeezed and shrunk. The inner conductor will shift with the deformation of the deformation filling layer, away from the damaged position, reducing the chance of the cable contacting seawater. While the reinforced heat pipe strengthens the overall strength of the cable, it also relies on the curved heat conducting sheet to transfer heat. The heat of the inner conductor is transferred to the curved heat conducting sheet through the thermally conductive foam silicone layer, inner armor layer and thermally conductive insulation layer. The heat is then carried away by the circulating air inside the reinforced heat pipe, balancing the heat inside the cable and preventing overheating. The thermally conductive foam silicone layer 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 pipe, the expanding rubber block will absorb water and expand, blocking the water inflow and preventing further water seepage damage. The outer protective support assembly ensures the wear of cables in shallow waters, especially on the seabed, by buffering the outside and preventing friction damage. It also temporarily blocks the infiltration of seawater when the cable is slightly damaged, ensuring its normal operation. The inner filling assembly pushes the inner conductor to shift and blocks the entry of seawater again when the cable is severely damaged, thereby improving the protective effect and effectively improving the protective performance of the cable, preventing the inner conductor from being damaged by seawater corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] In the attached figure: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic structural diagram of the outer protective support assembly of the present invention; Figure 3 This invention Figure 2 Schematic diagram of the A region structure; Figure 4 This is a schematic diagram of the installation structure of the positioning ring of the present invention; Figure 5 It is a schematic structural diagram of the filling component of the present invention; Figure 6 This invention Figure 5 Schematic diagram of the structure of region B; Figure 7 This is a schematic diagram of the installation structure of the expansion silicone tube of the present invention; Figure 8 This is a schematic diagram of the installation structure of the expansion rubber block of the present invention; Numbers in the figure: 1, insulation isolation layer; 2. External protective support assembly; 201. Armor layer; 202. Expansion layer; 203. Marking groove; 204. Expulsion groove; 205. Foam plastic strip; 206. Dyeing groove; 207. Dyeing bag; 208. Heat absorbing strip; 209. Zinc strip; 210. Expulsion ball; 211. Insulation and anti-corrosion layer; 212. Spiral support ring; 213. Fixing groove; 214. Positioning ring; 215. Buffer swivel; 216. Annular buffer net; 217. Annular expansion bag; 3. Inner filling assembly; 301. Inner conductor; 302. Thermally conductive foamed silicone layer; 303. Inner armor layer; 304. Thermally conductive insulation layer; 305. Deformable filling layer; 306. Reinforced heat pipe; 307. Arc-shaped heat conducting sheet; 308. Water-absorbing resin block; 309. Expanding rubber block; 310. Data transmission line; 311. Fission groove; 312. Expanding silicone tube; 313. Annular connecting pipe; 314. Ventilation hole; 315. Expanding rubber strip; 316. Annular clamping groove. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0019] Example: Figure 1-8As shown, the present invention provides a technical solution for preventing seawater corrosion of a 220kV submarine cable, comprising an insulating isolation layer 1, an outer protective support assembly 2 is provided on the outer side of the insulating isolation layer 1, and the outer protective support assembly 2 includes an armor layer 201, an expansion layer 202, a marking groove 203, a driving 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 driving ball 210, an insulating anti-corrosion layer 211, a spiral support ring 212, a fixing groove 213, a positioning ring 214, a buffer swivel 215, an annular buffer net 216 and an annular expansion bag 217; The outer side of the insulating isolation layer 1 is wrapped with an armor layer 201, and the outer side of the armor layer 201 is wrapped with an expansion layer 202. The armor layer 201 is spiral, and the bottom surface of the expansion layer 202 is embedded in the gap of the armor layer 201, closing the gap of the armor layer 201 to improve the water blocking ability. The outer side of the expansion layer 202 is evenly provided with a marking groove 203, and the expansion layer 202 is provided with a driving groove 204 on one side of the marking groove 203. The inside of the marking groove 203 is evenly filled with a foam plastic strip 205, and the top surface of the foam plastic strip 205 is provided with a dyeing groove 206. The color groove 206 is filled with a dye bag 207, and the top surface of the dye bag 207 is bonded with a heat-absorbing strip 208. The bottom surface of the foam plastic strip 205 is inlaid with a zinc strip 209. The marking groove 203 is evenly filled with a repelling ball 210 to mark the damaged position and repel fish that gnaw on the cable. The marking groove 203 and the marking groove 203 are both semicircular in longitudinal section. One side of the foam plastic strip 205 is an arc shape that fits the marking groove 203. The interior of the foam plastic strip 205 is hollow, which is convenient for the expansion layer 202 to push out the foam plastic strip 205 when it expands. The outside of the expansion layer 202 is wrapped with an insulating anti-corrosion layer 211, and the outside of the insulating anti-corrosion layer 211 is inlaid with a spiral support ring 212. The outside of the insulating anti-corrosion layer 211 is evenly provided with fixing grooves 213, and a positioning ring 214 is fixedly sleeved inside the fixing groove 213. A buffer swivel 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 swivel 215, and the inside of the annular buffer net 216 is filled with an annular expansion bag 217. The positioning ring 214 and the fixing groove 213 are interference fit. The outer diameter of the positioning ring 214 is larger than the diameter of the insulating anti-corrosion layer 211. The buffer swivel 215 and the positioning ring 214 are transition fit. The inside of the annular expansion bag 217 is filled with water-absorbing resin particles to facilitate the rotation of the annular buffer net 216 on the outside of the positioning ring 214.

[0020] The inner filling component 3 is evenly arranged inside the insulating isolation layer 1. The inner filling component 3 includes an inner conductor 301, a thermally conductive foamed silicone layer 302, an inner armor layer 303, a thermally conductive insulating layer 304, a deformable filling layer 305, a reinforced heat-conducting pipe 306, an arc-shaped heat-conducting sheet 307, a water-absorbing resin block 308, an expansion rubber block 309, a data transmission line 310, a fission groove 311, an expansion silicone tube 312, an annular connecting pipe 313, a ventilation hole 314, an expansion rubber strip 315 and an annular clamping groove 316; The outer side of the inner conductor 301 is wrapped with a thermally conductive foamed silicone layer 302, the outer side of the thermally conductive foamed silicone layer 302 is wrapped with an inner armor layer 303, the outer side of the inner armor layer 303 is wrapped with a thermally conductive insulation layer 304, the interior of the insulating isolation layer 1 is filled with a deformable filling layer 305, and 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 outer side of the reinforced heat-conducting pipe 306. The interior of the reinforced heat-conducting pipe 306 is evenly and alternately filled with water-absorbing resin blocks 308 and expandable rubber blocks 309. One side of the arc-shaped heat-conducting sheet 307 is attached to the outer side of the thermally conductive insulation layer 304. The end faces of the water-absorbing resin block 308 and the expandable rubber block 309 are both semicircular. The water-absorbing resin block 308 quickly absorbs water and expands, temporarily blocking and facilitating the expansion of the expandable rubber block 309. A data transmission line 310 is provided on the side of the deformable filling layer 305 close to the inner conductor 301, and fission grooves 311 are evenly opened on the outside of the deformable filling layer 305. The angle between the two side surfaces of the fission groove 311 is an acute angle. The expansion silicone tube 312 is a curved surface close to the insulating isolation layer 1, which facilitates the fission groove 311 to be pushed open by the expansion silicone tube 312 to prevent water seepage at the rupture position. The inside of the fission groove 311 is evenly filled with expansion silicone tubes 312, and the outside of the three expansion silicone tubes 312 located in the same plane are sleeved with an annular connecting tube 313. Ventilation holes 314 are opened in the annular connecting tube 313 corresponding to the expansion silicone tube 312, and expansion strips 315 are staggered and bonded inside the annular connecting tube 313. An annular clamping groove 316 is opened on the outside of the deformable filling layer 305 corresponding to the annular connecting tube 313.

[0021] The working principle and use process of the present invention are as follows: the outer side of the inner conductor 301 is wrapped with a heat-conducting foamed silicone layer 302 through an extruder, and then the outer side of the heat-conducting foamed silicone layer 302 is wrapped with an inner armor layer 303, and the outer side of the inner armor layer 303 is wrapped with a heat-conducting insulation layer 304 through an extruder. The heat-conducting insulation layer 304 is made of high-density polyethylene. The outer side of the reinforced heat-conducting pipe 306 is distributed with an arc-shaped heat-conducting sheet 307, and the reinforced heat-conducting pipe 306 is made of spring steel. The outer side of the reinforced heat-conducting pipe 306 is temporarily bonded with an arc-shaped heat-conducting sheet 307, and the arc-shaped heat-conducting sheet 307 is made of an aluminum alloy with excellent thermal conductivity. The outer side of the arc-shaped heat-conducting sheet 307 is temporarily bonded and fixed with the heat-conducting insulation layer 304, and the data transmission line 310 is arranged in the gap of the heat-conducting insulation layer 304, and the deformation filling layer 305 is wrapped by an extruder. The deformation filling layer 305 is low-density polyethylene. 11 is filled with an expandable silicone tube 312, and an annular connecting tube 313 is sleeved and fixed in the annular clamping groove 316. The ventilation hole 314 is aligned with the expandable silicone tube 312, and the insulating isolation layer 1 is wrapped. The insulating isolation layer 1 is an asphalt waterproof layer. The outer side of the insulating isolation layer 1 is wrapped with the armor layer 201, and the outer side of the armor layer 201 is wrapped with the expansion layer 202. The expansion layer 202 is water-swellable rubber. The foam plastic strip 205 is embedded and installed in the dyeing tank 206. After the dyeing bag 207 is embedded and installed in the dyeing tank 206, the insulating anti-corrosion layer 211 is wrapped. The insulating anti-corrosion layer 211 is high-density polyethylene. Finally, the assembled positioning ring 214 is equidistantly sleeved on the outer side of the insulating anti-corrosion layer 211 to complete the production operation of the submarine cable. The positioning ring 214, the buffer swivel 215 and the annular buffer net 216 are all made of corrosion-resistant stainless steel. After laying the cable, in shallow sea areas, if the cable is laid on a rock bed that cannot be buried, it will be displaced by collisions with ships, fishing nets, etc. The buffer swivel 215 and the annular buffer net 216 on the outside of the positioning ring 214 will rotate, and the cable will move horizontally along the seabed rock bed to prevent the cable from rolling and rubbing on the seabed rock bed and damaging the outer insulating anti-corrosion layer 211. If there are many protruding rocks, the annular expansion bag 217 in the annular buffer net 216 will be damaged by continuous collisions. The annular expansion bag 217 is made of high-density polyethylene, which is resistant to seawater corrosion but will also break. After the annular expansion bag 217 is broken, 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 ability, further avoiding damage to the insulating anti-corrosion layer 211. The spiral support ring 212 improves the strength of the insulating anti-corrosion layer 211 and maintains the integrity of the outer side. The insulating anti-corrosion layer 211 is made of high-density polyethylene, which has strong corrosion resistance, thus avoiding damage to the submarine cable and extending its service life. If the insulating anti-corrosion layer 211 of the submarine cable is slightly broken due to the bite of a ship anchor or a shark, the armor layer 201 provides support to reduce the degree of damage. At the same time, the expansion layer 202 absorbs water and expands, squeezing the damaged position and slowing down the speed of seawater infiltration into the cable. The expanded expansion layer 202 will expand the marking groove 203 and the driving groove 204, and the foam plastic strip 205 and the driving ball 210 will diffuse and flow out along the damaged position. Under the buoyancy of the foam plastic strip 205 itself and the counterweight of the zinc strip 209, the dyeing groove 206 floats upward until the foam plastic strip 205 floats on the water surface. The zinc strip 209 will react with the seawater and slowly produce a small amount of hydrogen, which accelerates the floating speed of the foam plastic strip 205. After 205 floats on the water surface, the foam plastic strip 205 and the dye bag 207 are both made of degradable plastic. The heat-absorbing strip 208 is a dark plastic sheet that absorbs heat, accelerating the decomposition of the foam plastic strip 205 and the dye bag 207, and 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 locate the damaged area for repair. The main component of the repelling ball 210 is a natural extract repellent, which repels nearby sharks, prevents subsequent bites by sharks, and also makes it easier for maintenance personnel to pull up the cable for repair. The natural extract repellent is selected from natural plant extracts such as capsaicin, eugenol, citral, and allicin. If the submarine cable armor layer 201 is also damaged and the damage is relatively serious, seawater will penetrate into the inner filling component 3, and the expansion silicone tube 312 at the position where the seawater has penetrated will expand and squeeze the expanded fission groove 311. The expansion silicone tubes 312 in the fission grooves 311 at other positions will be squeezed and contracted, and the fission grooves 311 will be squeezed and shrunk. The expansion rubber strip 315 in the annular connecting tube 313 near the expansion silicone tube 312 will absorb water and block the annular connecting tube 313, separating the expansion silicone tube 312 that absorbs water from the other dry expansion silicone tubes 312 that absorb water, preventing the expansion silicone tubes 312 at other positions from absorbing water and expanding. The inner conductor 301 will shift with the deformation of the deformable filling layer 305, away from the damaged position, reducing the probability of the cable contacting seawater. The reinforced heat pipe 306 not only strengthens the overall strength of the cable, but also transfers heat through the curved heat conductive sheet 307. The heat from the inner conductor 301 is transferred to the curved heat conductive sheet 307 through the thermally conductive foam silicone layer 302, the inner armor layer 303, and the thermally conductive insulation layer 304. The heat is then carried away by the air circulating inside the reinforced heat pipe 306, balancing the heat inside the cable and preventing overheating. The thermally conductive foam silicone layer 302 reduces the overall density of the cable, making it lighter and easier to lay. If the cable breaks and water enters the reinforced heat pipe 306, the expandable rubber block 309 will absorb the water and expand, blocking the water inflow and preventing further water damage. The outer protective support component 2 ensures the wear of the cable in shallow sea locations, especially the seabed, by buffering the outside and avoiding friction damage, and temporarily blocks the infiltration of seawater when the cable is slightly damaged, thereby ensuring its normal operation. The inner filling component 3 pushes the inner conductor 301 to shift and blocks the entry of seawater again when the cable is seriously damaged, thereby improving the protective effect, effectively improving the protective performance of the cable, and preventing the inner conductor 301 from being damaged by seawater corrosion.

[0022] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A 220 kV submarine cable for preventing seawater corrosion, comprising an insulating isolation layer (1), characterized in that: An outer protective support assembly (2) is provided on the outer side of the insulating isolation layer (1), and the outer protective support assembly (2) includes an armor layer (201); 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 outer side of the expansion layer (202) is uniformly provided with marking grooves (203), and the expansion layer (202) is provided with a driving groove (204) on one side of the marking groove (203); The outer side of the expansion layer (202) is wrapped with an insulating anti-corrosion layer (211), the outer side of the insulating anti-corrosion layer (211) is inlaid with a spiral support ring (212), the outer side of the insulating anti-corrosion layer (211) is evenly provided with fixing grooves (213), the interior of the fixing groove (213) is fixedly sleeved with a positioning ring (214), the outer side of the positioning ring (214) is rotatably sleeved with a buffer swivel (215), the outer side of the buffer swivel (215) is welded with an annular buffer net (216), and the interior of the annular buffer net (216) is filled with an annular expansion bag (217).

2. A 220kV submarine cable for preventing seawater corrosion according to claim 1, characterized in that: The marking groove (203) is uniformly filled with a foam plastic strip (205), the top surface of the foam plastic strip (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 strip (205) is inlaid with a zinc strip (209), and the marking groove (203) is uniformly filled with a driving ball (210).

3. A 220kV submarine cable for preventing seawater corrosion according to claim 2, characterized in that: The marking groove (203) and the longitudinal section of the marking groove (203) are both semicircular, one side of the foam plastic strip (205) is in an arc shape that fits the marking groove (203), and the interior of the foam plastic strip (205) is in a hollow state.

4. The 220kV submarine cable for preventing seawater corrosion according to claim 1, characterized in that: The armor layer (201) is spiral-shaped, and the bottom surface portion of the expansion layer (202) is embedded in the gap of the armor layer (201).

5. The 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 anti-corrosion layer (211), the buffer swivel (215) and the positioning ring (214) are connected by transition fit, and the annular expansion bag (217) is filled with water-absorbing resin particles.

6. The 220kV submarine cable for preventing seawater corrosion according to claim 1, characterized in that: An inner filling component (3) is evenly arranged inside the insulating isolation layer (1), and the inner filling component (3) includes an inner conductor (301); The outer side of the inner conductor (301) is wrapped with a heat-conducting foamed silica gel layer (302), the outer side of the heat-conducting foamed silica gel layer (302) is wrapped with an inner armor layer (303), the outer side of the inner armor layer (303) is wrapped with a heat-conducting insulating layer (304), and the interior of the insulating isolation layer (1) is filled with a deformable filling layer (305); A data transmission line (310) is provided on one side of the deformable filling layer (305) close to the inner conductor (301), and fission grooves (311) are uniformly provided on the outer side of the deformable filling layer (305). 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 in the same plane, and ventilation holes (314) are provided inside the annular connecting tube (313) corresponding to the expansion silicone tubes (312). Expansion rubber strips (315) are staggered and bonded inside the annular connecting tube (313), and an annular clamping groove (316) is provided on the outer side of the deformable filling layer (305) corresponding to the annular connecting tube (313).

7. The 220kV submarine cable for preventing seawater corrosion according to claim 6, characterized in that: 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), and the inside of the reinforced heat conducting pipe (306) is evenly and alternately filled with water-absorbing resin blocks (308) and expansion rubber blocks (309).

8. The 220kV submarine cable for preventing seawater corrosion according to claim 7, characterized in that: One side of the arc-shaped heat-conducting sheet (307) is in contact with the outer side of the heat-conducting insulating layer (304), and the end faces of the water-absorbing resin block (308) and the expansion rubber block (309) are both semicircular.

9. The 220kV submarine cable for preventing seawater corrosion according to claim 6, characterized in that: The angles between the two side surfaces of the fission groove (311) are acute angles, and the side of the expansion silicone tube (312) close to the insulating isolation layer (1) is a curved surface.

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