Integrated environmentally friendly cable for underwater monitoring transmission

Abstract

This application belongs to the field of submarine cable technology and provides a comprehensive environmentally friendly cable for underwater monitoring and transmission. From the inside out, it comprises a cable core, a wrapping tape, a heat dissipation layer, a water-blocking layer, an armor layer, and an outer sheath. The heat dissipation layer includes heat dissipation units, each comprising an evaporation layer and a condensation layer. The evaporation layer surrounds the wrapping tape, and the condensation layer surrounds the evaporation layer. At least one first tube is disposed within the condensation layer, and a second tube is disposed within the evaporation layer. The first and second tubes are connected, and a heat dissipation medium is disposed within both tubes. The heat dissipation medium in the second tube evaporates and enters the first tube, while the heat dissipation medium in the first tube cools down and descends into the second tube. By placing a heat dissipation layer outside the wrapping tape layer, the heat dissipation path can be minimized, improving heat conduction efficiency. Furthermore, the structure of the heat dissipation layer is an active heat dissipation structure, greatly improving the heat dissipation effect.

Description

Technical Field

[0001] This application relates to the field of submarine cable technology, specifically to an integrated environmentally friendly cable for underwater monitoring and transmission. Background Technology

[0002] Underwater monitoring and transmission cables have broad application prospects in marine engineering, environmental monitoring, and offshore wind power transmission. As critical equipment, poor heat dissipation in underwater monitoring and transmission cables can lead to a continuous rise in conductor temperature, exceeding the insulation's temperature resistance rating, accelerating insulation material aging, shortening service life, and increasing conductor resistance in high-temperature environments, resulting in actual current carrying capacity lower than theoretical values ​​and reduced system capacity. Traditional three-core submarine cables have poor heat dissipation, easily causing heat accumulation in the internal core structure, affecting the normal operation of the cable. Summary of the Invention

[0003] To address the problems existing in the prior art, this application provides an integrated environmentally friendly cable for underwater monitoring and transmission, including a heat dissipation layer, a heat dissipation unit, an evaporation layer, and a condensation layer. At least one first pipe is disposed within the condensation layer, and a second pipe is disposed within the evaporation layer. A heat dissipation medium is disposed within both the first and second pipes. The first and second pipes are connected, and the heat dissipation medium evaporates in the second pipe and condenses in the first pipe. Furthermore, the heat dissipation layer has an active heat dissipation structure, thereby solving the technical problem of poor heat dissipation performance in the integrated environmentally friendly cable for underwater monitoring and transmission.

[0004] This application provides an integrated environmentally friendly cable for underwater monitoring and transmission, which consists of a cable core, a wrapping tape, a heat dissipation layer, a water-blocking layer, an armor layer, and an outer sheath from the inside out. The heat dissipation layer includes a heat dissipation unit, which includes an evaporation layer and a condensation layer. The evaporation layer is adjacent to and surrounds the wrapping tape, and the condensation layer is disposed outside the evaporation layer.

[0005] At least one first tube is provided in the condensation layer, and a second tube is provided in the evaporation layer. The first tube has a first through hole and a second through hole, which are connected to the second tube. A heat dissipation medium is provided in the first tube and the second tube. The heat dissipation medium evaporated in the second tube enters the first tube through the first through hole, and the heat dissipation medium cooled in the first tube enters the second tube through the second through hole. The first tube and the second tube are filled with a matrix, so that the evaporation layer and the condensation layer form a whole.

[0006] In some embodiments, the first tube is a tube with a wavy shape formed on the circumferential surface of the cable; the second tube is a flat tube with a radially wavy shape formed on the cross-section of the cable.

[0007] In some embodiments, the first end of the first tube extends toward the cable core and communicates with the first side crest of the second tube through a first through hole, and the second end of the first tube extends downward and communicates with the second side crest of the second tube through a second through hole.

[0008] In some embodiments, the number of the first tubes is consistent with the number of wave crests formed by the second tubes on the cross-section of the cable. The central axis of the first tubes corresponds to the wave crests of the second tubes. Each first tube is provided with a plurality of first through holes and second through holes at intervals on its central axis. The second tubes are connected to the first through holes and second through holes at corresponding positions on the wave crests.

[0009] In some embodiments, the number of wave crests formed by the second tube on the cross-section of the cable is an even multiple of the number of the first tubes. Each first tube has a plurality of first through holes at the first side of the wave crest and a plurality of second through holes at the second side of the wave crest. The second tube is connected to the first tube at the position corresponding to the first through hole on the odd-numbered wave crests and is connected to the first tube through the second through hole at the position corresponding to the second through hole on the even-numbered wave crests.

[0010] In some embodiments, the heat dissipation units are evenly spaced in the circumferential direction of the cable and unevenly spaced in the longitudinal direction of the cable.

[0011] In some embodiments, the heat dissipation medium includes both gaseous and liquid media, thereby enabling autonomous flow through changes in air pressure during evaporation and condensation.

[0012] In some embodiments, the inner wall of the second tube is further provided with support ribs in the longitudinal direction, and through holes are provided on the support ribs for the flow of heat dissipation medium.

[0013] In some embodiments, the armor layer includes a first reinforcement and a second reinforcement, the first reinforcement being solid glass fiber, and the second reinforcement including hollow glass fiber and triangular steel wire disposed within the hollow glass fiber.

[0014] In some embodiments, the cable core includes a filler strip, the filler strip including a support strip and a heat-conducting strip, wherein the support strip forms a polygonal cavity and the optical fiber unit is disposed within the polygonal cavity; one end of the heat-conducting strip contacts the conductor core and the other end contacts the wrapping tape, for transferring the heat of the conductor core to the outer heat dissipation layer.

[0015] Compared with existing technologies, the beneficial effects achieved by this application are as follows: This application provides a heat dissipation layer on the outside of the wrapping layer, which minimizes the heat dissipation path and improves heat conduction efficiency; furthermore, the heat dissipation layer has an active heat dissipation structure, greatly enhancing the heat dissipation effect. The evaporation layer of the heat dissipation layer has a radially corrugated flat tube structure, which improves both heat dissipation and the compressive strength of the integrated environmentally friendly cable for underwater monitoring and transmission. The condensation layer forms a curved structure around the cable circumference, increasing the flow path of the heat dissipation medium and allowing it to cool sufficiently, thus improving the heat dissipation effect of the heat dissipation unit and ensuring good heat dissipation performance of the cable. In addition, the armor layer features a hollow glass fiber structure filled with triangular steel wires, which improves heat transfer while the stability of the triangles ensures the strength of the integrated environmentally friendly cable for underwater monitoring and transmission.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This invention provides a schematic diagram of the structure of an integrated environmentally friendly cable for underwater monitoring transmission.

[0019] Figure 2 A schematic diagram of the conductor core structure in this application is shown;

[0020] Figure 3 This paper shows a schematic diagram of one structure of the heat dissipation unit in this application;

[0021] Figure 4 It shows Figure 3 A schematic diagram of the structure of the first tube in the heat dissipation unit;

[0022] Figure 5 A schematic diagram of another structure of the heat dissipation unit in this application is shown;

[0023] Figure 6 It shows Figure 5 A schematic diagram of the structure of the first tube in the heat dissipation unit;

[0024] Figure 7 This paper shows another structural schematic diagram of the heat dissipation unit in this application.

[0025] In the diagram: 1-Cable core, 11-Conductor core, 111-Water-blocking conductor, 112-Inner shielding layer, 113-Insulation layer, 114-Outer shielding layer, 115-Water-blocking buffer strip, 116-Metallic shielding layer, 117-Blended semi-conductive sheath, 12-Filling strip, 121-Supporting strip, 122-Heat-conducting strip, 13-Optical unit, 2-Wrapping tape, 3-Heat dissipation layer, 30-Heat dissipation unit, 31-Condensation layer, 311-First tube, 312-Second tube 313-Second through hole, 32-Evaporation layer, 321-Second tube, 33-Gaseous medium, 34-Liquid medium, 35-Matrix, 4-Water-blocking layer, 5-PP inner lining layer, 6-Armor layer, 61-First reinforcing member, 62-Second reinforcing member, 621-Hollow glass fiber, 622-Triangular steel wire, 7-Outer sheath, 71-Heat dissipation fins, A-First end, B-Second end, C-First side, D-Second side, O-Central shaft. Detailed Implementation

[0026] The term "comprising" in this application specification is synonymous with "including," "containing," or "characterized in," and is inclusive or open-ended, and does not exclude additional undescribed elements or method steps.

[0027] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] This application provides an integrated environmentally friendly cable for underwater monitoring and transmission, comprising, from the inside out, a cable core 1, a sheath 2, a heat dissipation layer 3, a water-blocking layer 4, a PP inner liner 5, an armor layer 6, and an outer sheath 7. Figure 1 As shown. The cable core 1 includes a conductor core 11, a filler strip 12, and an optical unit 13. The conductor core 11 includes a water-blocking conductor 111, an inner shielding layer 112, an insulating layer 113, an outer shielding layer 114, a water-blocking buffer strip 115, a metallic shielding layer 116, and a blended semi-conductive sheath 117, as shown. Figure 2 As shown.

[0031] Among them, the insulation layer 113 is a nano-filled polypropylene insulation material. It uses nano-crystals to fill the polypropylene insulation material. Polypropylene is recyclable. It is mainly by doping different nanoparticles to introduce the interface region and decompose the by-products of the insulation material in the cross-linking process. No degassing process is required, which can save production costs. At the same time, it improves the smoothness and uniformity of the surface of the insulation layer 113, reduces the leakage current caused by local defects, and thus improves the space charge performance and breakdown performance.

[0032] The blended semi-conductive sheath 117 comprises: approximately 50%-70% polyethylene with a density between 0.945-0.955 g / cm³, approximately 20%-40% conductive carbon black (furnace black can be used), approximately 0.5%-1% antioxidant, approximately 10%-20% thermoplastic elastomer, approximately 3%-5% water-resistant agent, and approximately 1%-2% stabilizer. The blended semi-conductive sheath 117 possesses certain conductivity to improve electrical properties such as electric field distribution, while also exhibiting better mechanical properties, able to withstand greater external impact and long-term mechanical wear. Especially when the cable is connected to a transformer system with three phases separated, it provides better protection for the insulated core.

[0033] The filler strip 12 has a hollow structure, including a support strip 121 and a heat-conducting strip 122. The support strip 121 forms a polygonal cavity, and the optical fiber unit is disposed in the polygonal cavity. One end of the heat-conducting strip 122 contacts the conductor core 11, and the other end contacts the wrapping tape 2, for transferring the heat of the conductor core 11 to the outer heat dissipation layer 3.

[0034] The polygonal cavity formed by the support bar 121 is roughly trapezoidal, with a pair of diagonals supporting the outer edge of the cable core 1 and between adjacent conductor cores 11. The lower half of the trapezoidal structure uses a semi-conductive PE sheath, while the upper half uses a PE sheath. This structure effectively prevents damage to the optical cable from cable twisting during the cabling process of the integrated environmentally friendly cable for underwater monitoring and transmission. Simultaneously, the use of a semi-conductive PE sheath maintains conductivity with the outer sheath 7 of the cable core 1, ensuring a good electrical connection. The support bar 121 is made of polypropylene, forming a support with the trapezoid, and its hollow structure improves the cable's bending performance.

[0035] Furthermore, at least two heat-conducting strips 122 are provided in the same filler strip 12, respectively disposed on both sides of the polygonal cavity, and in contact with the two adjacent conductor cores 11.

[0036] Furthermore, at least two sets of heat-conducting strips 122 are provided in the same filler strip 12, symmetrically arranged on both sides of the support strip 121. Each set of heat-conducting strips 122 includes two heat-conducting strips 122, which are in contact with the optical unit 13 and the conductor core 11 respectively. At the same time, heat is conducted to the optical unit 13 and the conductor core 11.

[0037] The heat dissipation layer 3 includes a heat dissipation unit 30, which includes a condensation layer 31 and an evaporation layer 32. The evaporation layer 32 is adjacent to and surrounds the wrapping tape 2, and is in contact with the wrapping tape 2. The condensation layer 31 is disposed outside the evaporation layer 32. At least one first pipe 311 is disposed within the condensation layer 31, and a second pipe 321 is disposed within the evaporation layer 32. A heat dissipation medium is disposed within both the first pipe 311 and the second pipe 321. The first pipe 311 has a first through hole 312 and a second through hole 313, which are connected to the second pipe 321. The heat dissipation medium evaporated in the second pipe 321 enters the first pipe 311 through the first through hole 312, and the cooled heat dissipation medium in the first pipe 311 enters the second pipe 321 through the second through hole 313. The first pipe 311 and the second pipe 321 are filled with a matrix 35, so that the evaporation layer 32 and the condensation layer 31 form a whole, thereby protecting the pipes. Figure 3 As shown. Each heat dissipation unit 30 can be prefabricated and wrapped during cabling. The heat dissipation unit 30 can also be made in various specifications, wherein the width of the heat dissipation unit 30 can be the same, while the length can have at least two specifications.

[0038] Furthermore, when the first through-hole 312 connects the first pipe 311 and the second pipe 321, the first through-hole 312 has a larger diameter on the side closer to the first pipe 311 than on the side closer to the second pipe 321. Similarly, when the second through-hole 313 connects the first pipe 311 and the second pipe 321, the second through-hole 313 has a smaller diameter on the side closer to the first pipe 311 than on the side closer to the second pipe 321. The heat dissipation medium in the second pipe 321 evaporates and enters the first pipe 311 through the first through-hole 312. After cooling, the heat dissipation medium in the first pipe 311 descends into the second pipe 321 through the second through-hole 313. That is, both the first through-hole 312 and the second through-hole 313 have asymmetrical diameters, resulting in a flow preference where the heat dissipation medium is more easily introduced on the side with the larger diameter. This creates a regular flow path in the first pipe 311 and the second pipe 321, preventing the heat dissipation medium from accumulating at certain locations in the first and second pipes, thereby reducing the circulation efficiency of the heat dissipation medium.

[0039] The condensation layer 31 is provided with at least one first tube 311, which is a tube with a wavy shape formed on the circumferential surface of the cable; the second tube 321 is a flat tube with a radially wavy shape formed on the cross-section of the cable.

[0040] The second tube 321 is a flat tube arranged in a wavy shape along the radial direction, which changes the traditional "point" or "line" contact heat dissipation to "surface" heat dissipation of the entire armor layer 6, resulting in an exponential increase in heat dissipation area and efficiency. The first tube 311 is a circular tube arranged in a wavy shape along the axial direction.

[0041] In some embodiments, the first end A of the first tube 311 extends towards the cable core 1 and communicates with the first side C crest of the second tube 321 through a first through hole 312, and the second end B of the first tube 311 extends downward and communicates with the second side D crest of the second tube 321 through a second through hole 313. Figure 3-4 As shown.

[0042] In some embodiments, the number of first tubes 311 is consistent with the number of wave crests formed by the second tubes 321 on the cable cross-section. The central axis O of the first tubes 311 corresponds to the wave crest of the second tubes 321. Each first tube 311 has a plurality of first through holes 312 and second through holes 313 spaced apart on its central axis O. The second tubes 321 are connected to the first through holes 312 and second through holes 313 at corresponding positions on the wave crests. Figure 5-6 As shown.

[0043] In some embodiments, the number of wave crests formed by the second tube 321 on the cable cross-section is an even multiple of the number of first tubes 311. Each first tube 311 has a plurality of first through holes 312 at the crest on its first side C, and a plurality of second through holes 313 at the crest on its second side D. The second tube 321 connects to the first tube 311 at the positions corresponding to the first through holes 312 on the odd-numbered crests, and connects to the first tube 311 at the positions corresponding to the second through holes 313 on the even-numbered crests through the second through holes 313. The arrangement of the first through holes 312 and the second through holes 313 is as follows: Figure 7 As shown.

[0044] The heat dissipation units 30 are evenly spaced in the circumferential direction of the cable, but unevenly spaced in the longitudinal direction. For example, when the heat dissipation units 30 are made in two specifications, the first and second specifications of heat dissipation units 30 are the same in width but different in length, and have two lengths. During cabling, the two specifications of heat dissipation units 30 are arranged at intervals in the circumferential direction, so that the joints of the heat dissipation units 30 in the longitudinal direction of the cable are not on the same circumference.

[0045] Compared to uniform spacing, the heat dissipation effect is still present in the radial direction at the adjacent points of different heat dissipation units 30, thus giving the integrated environmentally friendly cable for underwater monitoring and transmission a good overall heat dissipation effect. Furthermore, the non-uniform spacing in the longitudinal direction causes the heat dissipation units 30 on the same cross section of the cable circumference to interlock. Compared to uniform spacing, this can prevent breakage at the joints when bending, thus ensuring the cable's tensile strength.

[0046] The materials for the first tube 311 and the second tube 321 can be high-strength corrosion-resistant alloys, such as titanium alloy (TC4) or duplex stainless steel. They combine extremely high strength, excellent resistance to seawater corrosion, and good thermal conductivity.

[0047] The heat dissipation medium in the first tube 311 and the second tube 321 can be filled with liquid medium 34 and gaseous medium 33. During the evaporation and condensation process, the flow is driven autonomously by the change of gas pressure, avoiding complex drive design.

[0048] Furthermore, the inner wall of the second tube 321 is provided with support ribs in the longitudinal direction to support the second tube 321 when it is bent, so as to prevent it from being squeezed and flattened, thus affecting the flow of heat dissipation medium. At the same time, through holes are provided on the support ribs for the flow of heat dissipation medium.

[0049] The further heat dissipation units 30 are unevenly spaced longitudinally. Compared with uniformly spaced units, they still have a heat dissipation effect radially at the adjacent points of different heat dissipation units 30. This gives the integrated environmentally friendly cable for underwater monitoring and transmission a good overall heat dissipation effect.

[0050] The armor layer 6 includes a first reinforcing member 61 and a second reinforcing member 62. The first reinforcing member 61 is solid glass fiber, and the second reinforcing member 62 includes hollow glass fiber 621 and triangular steel wires 622 disposed within the hollow glass fiber 621. The hollow structure is filled with air to further improve heat dissipation. In addition, the triangular steel wires 622 support the hollow glass fiber 621 to ensure the strength of the armor layer 6. Furthermore, the corners of the triangular steel wires 622 are not adjacent to the inner sheath, which ensures the stability of the cable armor and avoids the force of the triangle acting on a point of the inner sheath, thus preventing damage to the inner sheath.

[0051] The outer surface of the outer sheath 7 is also provided with heat dissipation fins 71 to increase the turbulence of seawater and further improve the heat dissipation effect.

[0052] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A comprehensive environmentally friendly cable for underwater monitoring and transmission, comprising, from the inside out, a cable core, a wrapping tape, a heat dissipation layer, a water-blocking layer, an armor layer, and an outer sheath; characterized in that, The heat dissipation layer includes a heat dissipation unit, which includes an evaporation layer and a condensation layer. The evaporation layer is adjacent to and surrounds the wrapping tape, and the condensation layer is disposed outside the evaporation layer. The condensation layer is provided with at least one first tube, and the evaporation layer is provided with a second tube. The first tube is a tube with a wavy shape formed on the circumference of the cable; the second tube is a flat tube with a wavy shape formed in the radial direction on the cross-section of the cable. The first tube is provided with a first through hole and a second through hole, which are connected to the second tube. A heat dissipation medium is provided inside the first tube and the second tube. The heat dissipation medium evaporated in the second tube enters the first tube through the first through hole, and the heat dissipation medium cooled in the first tube enters the second tube through the second through hole. The first tube and the second tube are filled with a matrix, so that the evaporation layer and the condensation layer form a whole.

2. The integrated environmentally friendly cable for underwater monitoring and transmission according to claim 1, characterized in that, When the first through hole connects the first pipe and the second pipe, the first through hole has a larger diameter near the first pipe than near the second pipe. When the second through hole connects the first pipe and the second pipe, the second through hole has a smaller diameter near the first pipe than near the second pipe.

3. The integrated environmentally friendly cable for underwater monitoring and transmission according to claim 1, characterized in that, The first end of the first tube extends towards the cable core and connects with the first side crest of the second tube through the first through hole. The second end of the first tube extends downward and connects with the second side crest of the second tube through the second through hole.

4. The integrated environmentally friendly cable for underwater monitoring and transmission according to claim 1, characterized in that, The number of the first tubes is the same as the number of wave crests formed by the second tubes on the cross-section of the cable. The central axis of the first tubes corresponds to the wave crests of the second tubes. Each first tube has several first through holes and second through holes spaced apart on its central axis. The second tubes are connected to the first through holes and second through holes at the corresponding positions on the wave crests.

5. The integrated environmentally friendly cable for underwater monitoring and transmission according to claim 1, characterized in that, The number of wave crests formed by the second tube on the cross-section of the cable is an even multiple of the number of the first tube. Each first tube has several first through holes at the first side of the wave crest and several second through holes at the second side of the wave crest. The second tube is connected to the first tube at the position corresponding to the first through hole on the odd-numbered wave crests, and the second tube is connected to the first tube through the second through hole at the position corresponding to the second through hole on the even-numbered wave crests.

6. The integrated environmentally friendly cable for underwater monitoring and transmission according to claim 1, characterized in that, The heat dissipation units are evenly spaced in the circumferential direction of the cable, but are unevenly spaced in the longitudinal direction of the cable.

7. The integrated environmentally friendly cable for underwater monitoring and transmission according to claim 1, characterized in that, The heat dissipation medium includes both gaseous and liquid media, thereby achieving autonomous flow through changes in air pressure during evaporation and condensation.

8. The integrated environmentally friendly cable for underwater monitoring and transmission according to claim 1, characterized in that, The inner wall of the second tube is also provided with support ribs in the longitudinal direction, and through holes are provided on the support ribs for the flow of heat dissipation medium.

9. The integrated environmentally friendly cable for underwater monitoring and transmission according to claim 1, characterized in that, The armor layer includes a first reinforcing member and a second reinforcing member. The first reinforcing member is solid glass fiber, and the second reinforcing member includes hollow glass fiber and triangular steel wire disposed within the hollow glass fiber.

10. The integrated environmentally friendly cable for underwater monitoring and transmission according to claim 1, characterized in that, The cable core includes a filler strip, which includes a support strip and a heat-conducting strip. The support strip forms a polygonal cavity, and the optical fiber unit is disposed inside the polygonal cavity. One end of the heat-conducting strip contacts the conductor core, and the other end contacts the wrapping tape, used to transfer the heat of the conductor core to the outer heat dissipation layer.

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