Submarine cable with heat dissipation function

Abstract

The application provides a submarine cable with a heat dissipation function, which comprises an inner protective layer, a center piece, a plurality of electric unit assemblies, a heat dissipation assembly and a support piece. The inner protective layer is internally provided with a receiving cavity and a circulating flow channel. The center piece is located in the receiving cavity and is provided with a first flow channel. The first flow channel is used for accommodating cooling liquid. The plurality of electric unit assemblies are located in the receiving cavity. The electric unit assembly comprises an electric unit and a cladding piece. The cladding piece is arranged around the outer periphery of the electric unit and is provided with a second flow channel. The second flow channel is used for accommodating cooling liquid and is communicated with the first flow channel and the circulating flow channel. The cooling liquid in the first flow channel and the second flow channel is heated to form circulating gas, which enters the circulating flow channel. The heat dissipation assembly is arranged around the outer periphery of the inner protective layer and is configured to cool the inner protective layer, so as to liquefy the circulating gas in the circulating flow channel. The support piece is located in the receiving cavity and is provided with a third flow channel. The third flow channel is communicated with the circulating flow channel and the first flow channel, and is used for conveying the cooling liquid formed by the liquefaction of the circulating gas to the first flow channel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submarine cables, and in particular to a submarine cable with a heat dissipation function. BACKGROUND

[0002] Traditional three-core submarine cables have poor heat dissipation effects, and heat is easily concentrated at the internal core structure of the submarine cable, which affects the normal operation of the submarine cable. SUMMARY

[0003] The present application provides a submarine cable with a heat dissipation function to solve the problem of poor heat dissipation effect of the known technology.

[0004] The present application provides a submarine cable with a heat dissipation function, comprising an inner protective layer, a center piece, a plurality of electric unit assemblies, a heat dissipation assembly, and a support piece. The inner protective layer is provided with a receiving cavity, and the inner protective layer is provided with a circulating flow channel. The center piece is located in the receiving cavity, and the center piece is provided with a first flow channel for receiving cooling liquid. The plurality of electric unit assemblies are located in the receiving cavity, and the electric unit assembly comprises an electric unit and a cladding piece, the cladding piece is arranged around the outer periphery of the electric unit, the cladding piece is provided with a second flow channel for receiving cooling liquid, the second flow channel is in communication with the first flow channel and the circulating flow channel, and the cooling liquid in the first flow channel and the second flow channel is heated to form circulating gas entering the circulating flow channel. The heat dissipation assembly is arranged around the outer periphery of the inner protective layer, and the heat dissipation assembly is configured to cool the inner protective layer to liquefy the circulating gas in the circulating flow channel. The support piece is located in the receiving cavity, and the support piece is provided with a third flow channel in communication with the circulating flow channel and the first flow channel, for conveying the cooling liquid formed by liquefying the circulating gas into the first flow channel.

[0005] In one possible implementation, a plurality of cladding pieces are arranged around the center piece, one side of the cladding piece is connected to the inner protective layer, the other side of the cladding piece is provided with a connecting portion, the connecting portion is connected to the center piece, the connecting portion is provided with an intermediate flow channel, and the intermediate flow channel is in communication with the first flow channel and the second flow channel.

[0006] In one possible implementation, a first opening is provided at the connection between the cladding piece and the inner protective layer, the second flow channel and the circulating flow channel are in communication through the first opening, and a gas-permeable water-blocking film is provided at the first opening.

[0007] In a possible implementation, the circulation flow channel comprises a plurality of first flow segments and a plurality of second flow segments, any two adjacent first flow segments are provided with the second flow segment, the first flow segment is communicated with the second flow channel, and two ends of the first flow segment and two adjacent second flow segments are provided with a blocking piece configured to prevent the first flow segment from being communicated with the second flow segment.

[0008] In a possible implementation, one end of the third flow channel is communicated with the first flow segment, and the other end of the third flow channel is communicated with the first flow channel.

[0009] In a possible implementation, the support is located between two adjacent cladding pieces, one end of the support is connected to the center piece, the other end of the support is connected to the inner sheath, a second opening is arranged at the connection between the support and the inner sheath, and the third flow channel is communicated with the first flow segment through the second opening.

[0010] In a possible implementation, a first one-way water-blocking film is arranged at the second opening, and the first one-way water-blocking film is configured to allow the cooling liquid to enter the third flow channel only from the first flow segment.

[0011] In a possible implementation, a third opening is arranged at the connection between the support and the center piece, the third flow channel is communicated with the first flow channel through the third opening, and a second one-way water-blocking film is arranged at the third opening, and the second one-way water-blocking film is configured to allow the cooling liquid to enter the first flow channel only from the third flow channel.

[0012] In a possible implementation, the submarine cable with the heat dissipation function further comprises an optical unit, the support is made of a heat-conducting material and is provided with a threading groove for accommodating the optical unit.

[0013] The support is provided with two third flow channels arranged at two sides of the optical unit, and the two third flow channels are respectively communicated with two first flow segments.

[0014] In a possible implementation, the submarine cable with the heat dissipation function further comprises a filling piece filled in the second flow segment.

[0015] The submarine cable with heat dissipation function of the application can accommodate the cooling liquid by setting the first flow channel and the second flow channel. When the submarine cable works and the internal temperature rises, the cooling liquid will be heated and vaporized to form circulating gas. The cooling liquid will take away heat when it is vaporized, thereby cooling the electric unit. In addition, after the circulating gas enters the circulating flow channel, the heat dissipation assembly works to cool the circulating gas. The circulating gas condenses to form cooling liquid, and the cooling liquid is cooled by the heat dissipation assembly, so that the temperature of the cooling liquid is relatively low. The cooling liquid flows to the first flow channel and the second flow channel through the third flow channel, thereby making the cooling liquid with relatively low temperature circulate around the electric unit and the center piece to efficiently and comprehensively cool the two, thereby reducing the internal temperature of the submarine cable and ensuring the normal work of the submarine cable. In addition, when the heat dissipation assembly cools the inner protective layer, the inner protective layer can also act on the electric unit, thereby also cooling the electric unit. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic diagram of the submarine cable with heat dissipation function in an embodiment of the application.

[0017] Figure 2 FIG. 3 is a structural schematic diagram of the connecting part of the submarine cable with heat dissipation function in an embodiment of the application.

[0018] Figure 3 FIG. 4 is a structural schematic diagram of the heat dissipation assembly of the submarine cable with heat dissipation function in an embodiment of the application.

[0019] Main element symbol explanation: 100, submarine cable with heat dissipation function; 1, first opening; 2, second opening; 3, third opening; 10, inner protective layer; 11, circulating flow channel; 111, first flow section; 112, second flow section; 12, accommodation cavity; 13, blocking piece; 14, filling piece; 20, center piece; 21, center hole; 22, first flow channel; 30, electric unit assembly; 31, cladding piece; 310, second flow channel; 32, electric unit; 321, conductor; 322, insulation layer; 33, connecting part; 330, intermediate flow channel; 40, support piece; 41, threading groove; 42, buffer hole; 43, third flow channel; 50, optical unit; 60, heat dissipation assembly; 61, cold end layer; 62, electric cooling main body layer; 63, hot end layer; 70, outer protective layer.

[0020] The following specific implementation will further illustrate the application in combination with the above drawings. Specific implementation

[0021] The following description will refer to the accompanying drawings to more fully describe the contents of this application. Illustrated in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make this application thorough and complete and to fully convey the scope of this application to those skilled in the art. The same reference numerals represent the same or similar components.

[0022] The terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. In addition, when used herein, "includes" and / or "comprising" and / or "having" integers, steps, operations, components and / or components do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.

[0023] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and the context of this application, and will not be interpreted as idealized or overly formal meanings.

[0024] The specific implementation methods of the present application will be described in further detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, this embodiment provides a submarine cable 100 with heat dissipation function, including an inner sheath 10 , a center piece 20 , a plurality of electrical unit assemblies 30 , a heat dissipation assembly 60 , and a support member 40 .

[0026] The inner protective layer 10 is made of an insulating and thermally conductive material. For example, a plastic material with a highly thermally conductive filler (such as boron nitride, aluminum oxide, or graphene) can be added. The inner protective layer 10 is generally a hollow cylindrical structure, and a receiving cavity 12 is defined therein. Furthermore, the inner protective layer 10 is provided with an annular circulation channel 11, which is disposed at intervals around the periphery of the wall of the receiving cavity 12.

[0027] The center piece 20 is located in the accommodating cavity 12, and the center piece 20 is provided with a first flow channel 22 for accommodating the cooling liquid. The cooling liquid can be water or other liquid with a boiling point in the range of 70-110℃, so that when the internal temperature of the submarine cable is higher than the boiling point of the cooling liquid, the cooling liquid will vaporize. It should be noted that the internal temperature of the three-core submarine cable can reach 120℃ or even higher when it is working. A plurality of electric unit assemblies 30 are located in the accommodating cavity 12, and each electric unit assembly 30 comprises an electric unit 32 and a cladding piece 31 surrounding the outer periphery of the electric unit 32. The cladding piece 31 is provided with a second flow channel 310 for accommodating the cooling liquid, and the second flow channel 310 is connected to the first flow channel 22 and the circulating flow channel 11, so as to make the circulating gas in the first flow channel 22 and the second flow channel 310 enter the circulating flow channel 11. A heat dissipation assembly 60 is arranged around the outer periphery of the inner sheath 10, and the heat dissipation assembly 60 is configured to cool the inner sheath 10, so as to liquefy the circulating gas in the circulating flow channel 11. A support piece 40 is located in the accommodating cavity 12, and the support piece 40 is provided with a third flow channel 43 connected to the circulating flow channel 11 and the first flow channel 22, so as to transport the cooling liquid liquefied from the circulating gas to the first flow channel 22.

[0028] Thus, the submarine cable 100 with heat dissipation function of the present application can accommodate the cooling liquid by arranging the first flow channel 22 and the second flow channel 310. When the internal temperature of the submarine cable rises due to its working, the cooling liquid will vaporize to form circulating gas due to heat, and the cooling liquid will take away heat when it vaporizes, thereby cooling the electric unit 32. In addition, after the circulating gas enters the circulating flow channel 11, the heat dissipation assembly 60 works to cool the circulating gas, the circulating gas condenses to form cooling liquid, and the cooling liquid is cooled by the heat dissipation assembly 60, so that the temperature of the cooling liquid is relatively low. The cooling liquid flows to the first flow channel 22 and the second flow channel 310 through the third flow channel 43, and then the cooling liquid with relatively low temperature surrounds the electric unit 32 and the center piece 20 to efficiently and comprehensively cool them, thereby reducing the internal temperature of the submarine cable and ensuring the normal working of the submarine cable. In addition, when the heat dissipation assembly 60 cools the inner sheath 10, the inner sheath 10 can also act on the electric unit 32, thereby also cooling the electric unit 32.

[0029] Please also refer to Figure 1 and Figure 2 In an embodiment, a plurality of cladding pieces 31 are arranged around the center piece 20, one side of each cladding piece 31 is connected to the inner sheath 10, the other side of each cladding piece 31 is provided with a connecting part 33 connected to the center piece 20, and the connecting part 33 is provided with an intermediate flow channel 330 connected to the first flow channel 22 and the second flow channel 310.

[0030] The center piece 20 is made of insulating and heat-conducting material, which can be the same as that of the inner protective layer 10. The center piece 20 is substantially cylindrical and coaxially arranged at the center of the inner protective layer 10. The center piece 20 has a center hole 21 extending in parallel with the center piece 20 to improve the bending performance of the center piece 20. In addition, the center hole 21 can be filled with a filling rope to improve the strength of the center piece 20 while ensuring its bending performance, thereby improving the stability of the center piece 20 in supporting the inner protective layer 10 and the electric unit 32.

[0031] The number of the electric unit assembly 30 is three, and the three electric units 32 are arranged at equal intervals around the center piece 20, i.e., the central angle between any two adjacent electric units 32 is 120°. The electric unit 32 includes a conductor 321 and an insulating layer 322 covering the conductor 321. The conductor 321 is made of conductive material such as copper. In addition, the electric unit 32 can further include a shielding layer, a waterproof layer, and other necessary layer structures for realizing the functions of the electric unit 32. The specific structure of the electric unit 32 can be selected according to actual needs, which is not limited in the present application.

[0032] The cladding piece 31 is a circular ring structure and covers the outer periphery of the electric unit 32. The cladding piece 31 is made of insulating and heat-conducting material, which can be the same as that of the inner protective layer 10. The cladding piece 31 can not only protect the electric unit 32 from pressure but also receive the heat generated by the electric unit 32 during operation, thereby dissipating heat from the electric unit 32.

[0033] Along the radial direction of the electric unit 32, the side of the cladding piece 31 away from the connecting part 33 is connected to the inner wall of the inner protective layer 10. The connecting part 33 extends in parallel with the radial direction of the corresponding electric unit 32. The connecting part 33 is made of insulating and heat-conducting material. One end of the connecting part 33 is connected to the outer peripheral surface of the cladding piece 31, and the other end of the connecting part 33 is connected to the outer peripheral surface of the center piece 20, thereby fixing the position of the electric unit 32 in the accommodation cavity 12. The intermediate flow channel 330 extends in parallel with the connecting part 33, and one end of the intermediate flow channel 330 communicates with the first flow channel 22, and the other end of the intermediate flow channel 330 communicates with the second flow channel 310, so that the circulating gas and the cooling liquid can flow from the first flow channel 22 into the intermediate flow channel 330 and then from the intermediate flow channel 330 into the second flow channel 310.

[0034] It is worth noting that the submarine cable works to cause the temperature of the electric unit 32 to rise, the heat generated by the electric unit 32 is transmitted to the cooling liquid in the second flow channel 310 through the cladding 31, and the heat generated by the electric unit 32 is also transmitted to the center piece 20 through the cladding 31, and the center piece 20 transmits the received heat to the cooling liquid in the first flow channel 22, so that the cooling liquid is heated and vaporized, and the circulating gas fills the first flow channel 22, the intermediate flow channel 330 and the second flow channel 310, so that the internal pressure increases, and the circulating gas is sent to the circulating flow channel 11.

[0035] In some embodiments, the connecting part 33 has a certain elasticity and is configured in an accordion structure, so that the connecting part 33 can elastically deform in the extension direction thereof. For example, the connecting part 33 has a plurality of sections in the extension direction thereof, and the cross-sectional shape of each section is substantially hexagonal. On the one hand, when the electric unit 32 is extruded by an external force, the pressure on the electric unit 32 can be buffered by the connecting part 33, so as to avoid damage to the electric unit 32 under the action of a larger seawater pressure. On the other hand, the intermediate flow channel 330 in which the cooling liquid is accommodated is provided in the connecting part 33, and the connecting part 33 deforms when the electric unit 32 is extruded, so as to avoid problems such as bending and breaking of the connecting part 33 under extrusion.

[0036] Please refer to Figure 1 In an embodiment, the circulating flow channel 11 includes a plurality of first flow sections 111 and a plurality of second flow sections 112. Along the circumference of the inner sheath 10, the plurality of first flow sections 111 and the plurality of second flow sections 112 are arranged alternately, that is, any two adjacent first flow sections 111 are arranged with a second flow section 112 therebetween.

[0037] The number of the first flow sections 111 and the second flow sections 112 is the same as the number of the electric units 32, that is, the number of the first flow sections 111 and the second flow sections 112 is three. The three first flow sections 111 are arranged correspondingly with the three electric units 32, and the three first flow sections 111 are communicated with the three second flow channels 310, respectively. In addition, the two ends of the first flow section 111 and the two adjacent second flow sections 112 are provided with a blocking piece 13, which is configured to prevent the first flow section 111 from being communicated with the second flow section 112, so as to avoid that the cooling liquid in the first flow section 111 enters the second flow section 112 and cannot flow back to the first flow channel 22 through the third flow channel 43. Along the radial direction of the inner sheath 10, the two ends of the blocking piece 13 are connected to the inner wall of the circulating flow channel 11 near one side of the center piece 20 and the inner wall of the circulating flow channel 11 away from the other side of the center piece 20, respectively. It can be understood that the blocking piece 13 can be integrally formed with the inner sheath 10, so as to divide the circulating flow channel 11 into three first flow sections 111 and three second flow sections 112 by the six blocking pieces 13.

[0038] In the embodiment, the first opening 1 is arranged at the connection between the cover 31 and the inner sheath 10, the second flow channel 310 and the circulating flow channel 11 are communicated through the first opening 1, and the air-water barrier film is arranged at the first opening 1.

[0039] The air-water barrier film can allow the circulating gas in the second flow channel 310 to enter the circulating flow channel 11, but prevent the coolant in the second flow channel 310 from entering the circulating flow channel 11 and prevent the coolant in the circulating flow channel 11 from entering the second flow channel 310. The air-water barrier film can be an ePTFE film, and the PTFE is stretched and expanded to form a microporous structure. The ePTFE film has strong hydrophobicity and can block the coolant, but has high air permeability and can reduce the flow resistance of the circulating gas. In addition, the ePTFE film has high temperature resistance.

[0040] It can be understood that in other embodiments, a microporous PU air-permeable film can also be selected as the air-water barrier film. The air-water barrier film has good bending performance while realizing the air-water barrier function, and can be applied to scenes that need to be bent. The selection of the air-water barrier film can be selected according to actual design requirements, and is not limited in the embodiment.

[0041] In the embodiment, the submarine cable 100 with the heat dissipation function further comprises a filler 14, and the filler 14 is filled in the second flow section 112.

[0042] The filler 14 is made of an elastic material, and the filler 14 is substantially in a cylindrical structure. A plurality of fillers 14 are arranged in each second flow section 112, and the plurality of fillers 14 are sequentially arranged in the entire second flow section 112.

[0043] In this way, when the submarine cable works normally and does not need to be cooled, the first flow section 111 is filled with gas, and when the submarine cable is subjected to the pressure of seawater, the inner sheath 10 is bent towards the electric unit 32 under pressure, and the hollow first flow section 111 can buffer the pressure, thereby avoiding that the electric unit 32 is subjected to large pressure. At the same time, the composite structure formed by the filler 14 and the blocking piece 13 can support the structure of the side of the inner sheath 10 away from the central member 20, maintain the roundness of the inner sheath 10, and avoid cracks or damage of the first flow section 111 when the inner sheath 10 is bent under pressure.

[0044] Please refer to Figure 1 In an embodiment, the support member 40 is located between two adjacent covers 31, one end of the support member 40 is connected to the outer circumferential surface of the central member 20, and the other end of the support member 40 is connected to the inner circumferential surface of the inner sheath 10.

[0045] The material of the support 40 is the same as that of the center piece 20, and has a heat conduction function. In addition, the support 40 is substantially in a fan-shaped structure, the support 40 is arranged at intervals between two adjacent cladding pieces 31, and a filler such as a filling rope or other filling material with a certain elasticity can be arranged between the support 40 and the two adjacent cladding pieces 31, so as to improve the pressure resistance of the entire submarine cable and protect the structure of the electrical unit 32. In addition, when the cooling liquid at low temperature flows in the third flow channel 43, the cooling liquid can also cool the filler, thereby ensuring that the temperature of the entire internal space of the inner sheath 10 is reduced, and thereby ensuring that the electrical unit 32 is in a suitable working environment.

[0046] In the present embodiment, the submarine cable 100 with a heat dissipation function further comprises an optical unit 50. The optical unit 50 comprises an optical fiber and a loose tube wrapped around the outer periphery of the optical fiber. It can be understood that the optical unit 50 can also comprise a water-blocking layer, a buffer layer and other necessary layer structures for constituting the optical unit 50. The specific structure of the optical unit 50 is not limited in the present application, and the specific structure of the optical unit 50 can be selected according to actual needs.

[0047] The support 40 is provided with a threading groove 41 for accommodating the optical unit 50, so as to limit the position of the optical unit 50 through the support 40 and ensure the positional stability of the optical unit 50. In addition, the support 40 is wrapped around the outer periphery of the optical unit 50, and can also provide pressure protection for the optical unit 50. The number of optical units 50 can be the same as the number of supports 40, that is, the number of optical units 50 is three, and the three optical units 50 are arranged in the threading grooves 41 of the three supports 40. The optical unit 50 can be a communication optical fiber or a temperature measurement optical fiber with different functions.

[0048] It can be understood that in other embodiments, the number of optical units 50 can also be one or two.

[0049] In the present embodiment, the support 40 is provided with two third flow channels 43, the two third flow channels 43 are arranged on both sides of the optical unit 50, and the two third flow channels 43 are respectively connected to the two first flow sections 111. The two third flow channels 43 are substantially located at the region of the support 40 close to the adjacent electrical unit 32, so as to improve the cooling effect of the cooling liquid in the third flow channel 43 on the filler. In addition, the two third flow channels 43 are respectively located on the opposite sides of the optical unit 50, and the cooling liquid in the two third flow channels 43 can simultaneously cool the two sides of the optical unit 50, thereby improving the heat dissipation efficiency of the optical unit 50.

[0050] The two third flow channels 43 are connected to the first flow channel 22 at one end close to the center piece 20, and are connected to the two first flow sections 111 at the other end away from the center piece 20, so that any one of the first flow sections 111 can be connected to the first flow channel 22 through the two third flow channels 43, ensuring that the cooling liquid condensed in the first flow section 111 can flow from one third flow channel 43 to the first flow channel 22 when the submarine cable is in different postures, avoiding excessive accumulation of cooling liquid in the first flow section 111.

[0051] It is worth noting that the third flow channel 43 can be designed according to the principle of capillary action, so that the cooling liquid in the third flow channel 43 can more easily overcome its own gravity and enter the first flow channel 22. When the third flow channel 43 is designed according to the principle of capillary action, the size of the cross section of the third flow channel 43 can be reduced, or a gradient cross section size can be constructed.

[0052] In this embodiment, the support 40 is provided with a second opening 2 at the connection with the inner sheath 10, and the third flow channel 43 is connected to the first flow section 111 through the second opening 2. The second opening 2 is provided with a first one-way water-blocking film configured to allow cooling liquid to flow only from the first flow section 111 to the third flow channel 43, so that the cooling liquid can only flow from the first flow section 111 into the third flow channel 43, and the cooling liquid flowing into the third flow channel 43 cannot flow back into the first flow section 111 through the second opening 2.

[0053] The first one-way water-blocking film can be a microporous structure one-way valve film, which allows cooling liquid to flow only in one direction through an asymmetric microporous structure (such as a tapered hole or a gradient pore size), and can be made of polyurethane (PU) or other materials. It can be understood that the first one-way water-blocking film can also be a gradient wetting one-way moisture guide film or other film structures with one-way water-blocking function.

[0054] In this embodiment, the support 40 is provided with a third opening 3 at the connection with the center piece 20, and the third flow channel 43 is connected to the first flow channel 22 through the third opening 3. The third opening 3 is provided with a second one-way water-blocking film configured to allow cooling liquid to flow only from the third flow channel 43 to the first flow channel 22, so that the cooling liquid can only flow from the third flow channel 43 into the first flow channel 22, and the cooling liquid flowing into the first flow channel 22 cannot flow back into the third flow channel 43 through the third opening 3. The structure and principle of the second one-way water-blocking film are the same as those of the first one-way water-blocking film, and will not be described here.

[0055] In the embodiment, the support 40 is provided with a plurality of buffer holes 42. In the radial direction of the inner sheath 10, the plurality of buffer holes 42 are distributed on the side of the light unit 50 close to the inner sheath 10, so as to improve the bending performance of the support 40. Meanwhile, based on the support 40 corresponding to the second flow section 112, the filling piece 14 arranged in the second flow section 112 can compensate the influence of the compression resistance of the light unit 50 caused by the arrangement of the buffer hole 42, so as to ensure that the light unit 50 has sufficient compression protection.

[0056] Please combine Figure 1 and Figure 3 In an embodiment, the heat dissipation assembly 60 includes a cold end layer 61, an electric cooling main body layer 62 and a hot end layer 63 arranged in sequence on the outer periphery of the inner sheath 10. The electric cooling main body layer 62 is made of a silicon-based material or a III-V semiconductor 321 material, which can realize heat transfer based on the Peltier effect. When the electric cooling main body layer 62 is powered on, the electric cooling main body layer 62 can transfer the heat of the cold end layer 61 to the hot end layer 63, so as to cool the inner sheath 10 thermally coupled with the cold end layer 61. The electric cooling main body layer 62 can be externally connected to a power supply assembly by a conductive wire, so as to supply power to the electric cooling main body layer 62 through the power supply assembly.

[0057] The hot end layer 63 and the cold end layer 61 are made of a heat-conducting material such as metal, so as to form an electromagnetic shielding structure and improve the electromagnetic shielding ability of the submarine cable.

[0058] It can be understood that in other embodiments, the electric cooling main body layer 62 can also be a semiconductor 321 cooling chip. The semiconductor 321 cooling chip is embedded between the hot end layer 63 and the cold end layer 61, and the hot end of the semiconductor 321 cooling chip is thermally coupled with the hot end layer 63, and the cold end is thermally coupled with the cold end layer 61. The number of semiconductor 321 cooling chips is multiple, and the multiple semiconductor 321 cooling chips are arranged in sequence and spaced apart in the extension direction of the submarine cable, so as to improve the uniformity of heat dissipation.

[0059] In the embodiment, the submarine cable 100 with heat dissipation function further includes an outer sheath 70 arranged on the outer periphery of the hot end layer 63, which can transfer the heat generated by the hot end layer 63 to the seawater outside the submarine cable through the outer sheath 70.

[0060] The outer sheath 70 includes a shielding layer, a shielding insulation layer, a copper sleeve layer, an armor layer, an outer sheath and other layer structures. It can be understood that the outer sheath 70 also includes a fireproof layer, a waterproof layer and other necessary components constituting the outer sheath 70, and the specific structure of the outer sheath 70 is not limited in the present application, which can be selected according to actual needs.

[0061] In summary, when the temperature in the inner sheath 10 is higher than the boiling point of the cooling liquid, the cooling liquid vaporizes to form circulating gas, which enters the circulating flow channel 11. At this time, the heat dissipation assembly 60 starts to work, and then the circulating gas condenses to form cooling liquid, and the temperature of the cooling liquid is reduced. Because the cooling liquid in the first flow channel 22 and the second flow channel 310 becomes circulating gas, the air pressure in the two flow channels becomes larger, so that the cooling liquid in the first flow section 111 enters the third flow channel 43, and the support 40 and the light unit 50 and the filler in contact with the support 40 are cooled, and the cooled cooling liquid enters the first flow channel 22 through the third flow channel 43, and then enters the second flow channel 310 from the first flow channel 22, so that the central member 20 and the electrical unit 32 are cooled, and then the heat dissipation of each structure in the inner sheath 10 is realized.

[0062] When the heat dissipation is completed, the heat dissipation assembly 60 stops working, and even if part of the cooling liquid is left in the circulating flow channel 11 and the third flow channel 43 due to accidental factors. When the inner sheath temperature of the submarine cable is higher than the boiling point of the cooling liquid or the electrical unit 32 generates more heat, and the cooling liquid in the circulating flow channel 11 and the third flow channel 43 vaporizes, the circulating gas formed by vaporization can continue to participate in the heat dissipation cycle.

[0063] In the foregoing, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those skilled in the art can understand that various changes and replacements can be made to the specific embodiments of the present application without departing from the scope of the present application. These changes and replacements are within the scope defined by the present application.

Claims

1. A submarine cable with heat dissipation function, characterized in that: include: An inner protective layer, wherein a receiving cavity is provided therein, and the inner protective layer is provided with a circulation flow channel; a center piece located in the receiving cavity, the center piece being provided with a first flow channel for receiving a coolant; a plurality of electrical unit assemblies located within the receiving cavity, the electrical unit assemblies comprising electrical units and a covering member disposed around the periphery of the electrical units, the covering member defining a second flow channel for receiving a coolant, the second flow channel communicating with the first flow channel and the circulating flow channel for allowing circulating gas generated by heating the coolant within the first and second flow channels to enter the circulating flow channel; a heat dissipation assembly disposed around the outer periphery of the inner protective layer, the heat dissipation assembly being configured to cool the inner protective layer so as to liquefy the circulating gas in the circulating flow channel; A support member is located in the receiving cavity, and a third flow channel is opened in the support member. The third flow channel connects the circulation flow channel and the first flow channel, and is used to transport the cooling liquid formed by liquefying the circulating gas into the first flow channel.

2. The submarine cable with heat dissipation function according to claim 1, characterized in that: A plurality of the covering parts are arranged around the central part, one side of the covering part is connected to the inner protective layer, and the other side of the covering part is provided with a connecting portion, the connecting portion is connected to the central part, and the connecting portion is provided with an intermediate flow channel, and the intermediate flow channel connects the first flow channel and the second flow channel.

3. The submarine cable with heat dissipation function according to claim 2, characterized in that: A first opening is provided at the connection between the covering member and the inner protective layer, the second flow channel is communicated with the circulation flow channel through the first opening, and a breathable and water-blocking membrane is provided at the first opening.

4. The submarine cable with heat dissipation function according to claim 2, characterized in that: The circulation flow channel includes multiple first flow segments and multiple second flow segments, and the second flow segment is provided between any two adjacent first flow segments. The first flow segment is connected to the second flow channel, and a blocking member is provided between the two ends of the first flow segment and the two adjacent second flow segments. The blocking member is configured to prevent the first flow segment from connecting to the second flow segment.

5. The submarine cable with heat dissipation function according to claim 4, characterized in that: One end of the third flow channel is connected to the first flow section, and the other end of the third flow channel is connected to the first flow channel.

6. The submarine cable with heat dissipation function according to claim 5, characterized in that: The support member is located between two adjacent covering members, one end of the support member is connected to the center member, and the other end of the support member is connected to the inner protective layer. A second opening is provided at the connection between the support member and the inner protective layer, and the third flow channel is connected to the first flow section through the second opening.

7. The submarine cable with heat dissipation function according to claim 6, characterized in that: A first one-way water-blocking film is provided at the second opening, and the first one-way water-blocking film is configured to only allow the coolant to enter the third flow channel from the first flow section.

8. The submarine cable with heat dissipation function according to claim 6, characterized in that: A third opening is provided at the connection between the support member and the center member, the third flow channel is connected to the first flow channel through the third opening, and the third opening is provided with a second one-way water-blocking membrane, which is configured to only allow the coolant to enter the first flow channel from the third flow channel.

9. The submarine cable with heat dissipation function according to claim 6, characterized in that: The submarine cable with heat dissipation function further includes an optical unit. The support member is made of a heat-conducting material and is provided with a wire threading groove for accommodating the optical unit. The support member is provided with two third flow channels, the two third flow channels are arranged on both sides of the light unit, and the two third flow channels are respectively connected to the two first flow sections.

10. The submarine cable with heat dissipation function according to claim 4, characterized in that: The submarine cable with heat dissipation function further includes a filling piece, and the filling piece is filled in the second flow section.

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