A multi-core submarine cable and its manufacturing device

Abstract

The present application provides a multi-core submarine cable and its manufacturing device, including: a power cable, the power cable includes an electrical unit for conducting electricity and an optical unit for communication; a buffer and heat insulation structure unit, the buffer and heat insulation structure unit includes a braided rope and a first protective sleeve, and the first protective sleeve is extruded outside the braided rope; an auxiliary metal unit, the auxiliary metal unit includes a metal tube and a second protective sleeve, and the second protective sleeve is extruded outside the metal tube; wherein, the cross-sections of the power cable and the buffer and heat insulation structure unit are both circular, the cross-sectional diameter of the power cable is equal to the cross-sectional diameter of the buffer and heat insulation structure unit, and the buffer and heat insulation structure unit, the auxiliary metal unit and at least two of the power cables are stranded to form the cable core of the multi-core submarine cable. The present application can improve the stability and reliability of the submarine cable and reduce the production cost of the submarine cable.

Description

Technical Field

[0001] This application relates to the technical field of submarine cables, and in particular, to a multi-core submarine cable and a manufacturing device thereof. Background Art

[0002] With the continuous increase in the exploitation of oil and natural gas in the continental shelf sea areas, ocean engineering has become an important means to solve the current energy crisis. During the exploitation of offshore oil and gas, electricity, as the main power source for offshore oil and gas platforms, most offshore platforms rely on the power transmission from land power grids because it is difficult to generate sufficient electricity nearby on offshore platforms. Since it is difficult to implement overhead lines and other methods for offshore power transmission, lightweight and efficient submarine cables have become the most effective way to achieve long-distance and safe power transmission.

[0003] In related technologies, there is only one three-core power cable for the submarine cable, which supplies power to all the equipment on the platform centrally. The transmission is relatively single and the transmission capacity is limited, resulting in the need for additional submarine cables to transmit oil and gas, etc., increasing the manufacturing cost of the submarine cable. In addition, when the submarine cable operates with dynamic characteristics, the increase in system temperature during operation is likely to cause changes in the electrical performance parameters of the submarine cable, resulting in low stability and reliability of the submarine cable. Summary of the Invention

[0004] In view of this, this application provides a multi-core submarine cable and a manufacturing device thereof, which can improve the stability and reliability of the submarine cable and reduce the production cost of the submarine cable.

[0005] The first aspect of this application provides a shielded and flame-retardant flexible cable, including: a power cable, the power cable includes an electrical unit for conducting electricity and an optical unit for communication; a buffer and heat-insulating structure unit, the buffer and heat-insulating structure unit includes a braided rope and a first protective sleeve, and the first protective sleeve is extruded outside the braided rope; an auxiliary metal unit, the auxiliary metal unit includes a metal tube and a second protective sleeve, and the second protective sleeve is extruded outside the metal tube; wherein, the cross-sections of the power cable and the buffer and heat-insulating structure unit are both circular, the cross-sectional diameter of the power cable is equal to the cross-sectional diameter of the buffer and heat-insulating structure unit, and the buffer and heat-insulating structure unit, the auxiliary metal unit and at least two of the power cables are stranded to form the core of the multi-core submarine cable.

[0006] Compared with related technologies, the embodiments of this application have at least the following advantages:

[0007] By setting up the buffer and heat insulation structure unit, it can play a buffering and isolating role during the stranding process of multiple power cables, effectively avoiding the extrusion force during the stranding of power cables. The buffer and heat insulation structure unit can also reduce the power loss during the operation of multi-core submarine cables, and can control the operating temperature of multi-core submarine cables, improving the stability and reliability during the operation of multi-core submarine cables; by setting the cross-sectional diameter of the power cable to be equal to the cross-sectional diameter of the buffer and heat insulation structure unit, it can ensure a round stranding effect of the composite cable and improve the roundness of the finished submarine cable. By setting up the auxiliary metal unit, the auxiliary metal unit includes a metal pipe, through which oil and gas can be filled for offshore platform equipment, power, hydraulic pressure can be provided for subsea equipment, signal transmission and reagent injection can be maintained, ensuring the normal operation of the underwater control system, thus eliminating the need to set up additional submarine cables and reducing the production cost of multi-core submarine cables. In addition, since the power cable includes at least two, the power transmission capacity of the multi-core submarine cable can be improved.

[0008] In some possible implementation manners, the electrical unit includes a conductor, and a conductor shielding layer, a water-tree-resistant XLPE insulation layer, an insulation shielding layer, a first semi-conductive water-blocking tape layer, a copper tape shielding layer, a second semi-conductive water-blocking tape layer, and a third protective sheath that are sequentially wrapped around the outside of the conductor from the inside to the outside.

[0009] In some possible implementation manners, the conductor includes multiple round metal wires and a semi-conductive water-blocking glue; the multiple round metal wires are tightly pressed and stranded, and the semi-conductive water-blocking glue fills the multiple round metal wires after being tightly pressed and stranded to form the conductor.

[0010] In some possible implementation manners, the optical unit includes an optical fiber unit, and an outer sleeve, a semi-conductive inner sheath, an optical unit armor layer, a water-blocking tape layer, and a semi-conductive outer sheath that are sequentially wrapped around the outside of the optical fiber unit from the inside to the outside.

[0011] In some possible implementation manners, there are four power cables, three buffer and heat insulation structure units, and two auxiliary metal units; among them, the center lines of three of the four power cables form an equilateral triangle, and the other power cable is located at the center of the equilateral triangle; the three buffer and heat insulation structure units are respectively located on the three sides of the equilateral triangle.

[0012] In some possible implementation manners, the multi-core submarine cable further includes a circular filling unit; the four power cables, two buffer and heat insulation structure units, and two auxiliary metal units are stranded, and the circular filling unit fills the gap after the four power cables, two buffer and heat insulation structure units, and two auxiliary metal units are stranded to form the cable core of the multi-core submarine cable.

[0013] In some possible implementation manners, the power cable includes three of the electrical units and one optical unit; wherein, the center lines of the three electrical units form an equilateral triangle, and the optical unit is located in the gap between two adjacent electrical units.

[0014] In some possible implementation manners, the multi-core submarine cable further includes a cable inner sheath wrapped around the outer side of the cable core, an armor layer wrapped around the outer side of the cable inner sheath, an anti-corrosion layer coated on the outer side of the armor layer, and a cable outer sheath wrapped around the outer side of the anti-corrosion layer.

[0015] A second aspect of the present application provides a manufacturing device for a multi-core submarine cable, including: a power unit turntable, a structural unit reel, an auxiliary metal unit reel, a structural unit tension control device, a wire dividing and shaping device, and a cable stranding device; the power unit turntable is used for paying off the power cable, the structural unit reel is used for paying off the buffer and heat insulation structural unit, and the auxiliary metal unit reel is used for paying off the auxiliary metal unit; the structural unit tension control device is used for controlling the tension during the pay-off process of the structural unit reel, so that the tension during the pay-off process of the structural unit reel is the same as the tension during the pay-off process of the power unit turntable; the wire dividing and shaping device is used for determining the positions of the power cable, the buffer and heat insulation structural unit, and the auxiliary metal unit according to the cable core structure of the multi-core submarine cable; the cable stranding device is used for stranding the power cable, the buffer and heat insulation structural unit, and the auxiliary metal unit after wire dividing and shaping to form the cable core of the aforementioned multi-core submarine cable.

[0016] In some possible implementation manners, the structural unit tension control device includes a tension control expander, a slewing support wheel, a tension control chain, and a structural unit wire passing device; the structural unit wire passing device includes two groups of parallel guide wheels, and the buffer and heat insulation structural unit passes through the middle of the guide wheels; the tension control expander is connected to the tension control chain and realizes reciprocating telescopic movement through the slewing support wheel to adjust the pay-off tension of the structural unit reel.

[0017] It can be understood that the manufacturing device for the multi-core submarine cable provided in the second aspect above corresponds to the structure in the first aspect above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding structure provided above, and will not be elaborated here. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Cross-sectional view of a multi-core submarine cable provided by an embodiment of the present application.

[0020] Figure 2 Cross-sectional view of an electrical unit provided by an embodiment of the present application.

[0021] Figure 3 Cross-sectional view of an optical unit provided by an embodiment of the present application.

[0022] Figure 4 Cross-sectional view of a buffer heat insulation structure unit provided by an embodiment of the present application.

[0023] Figure 5 Cross-sectional view of an auxiliary metal unit provided by an embodiment of the present application.

[0024] Figure 6 Cross-sectional view of another structure of a multi-core submarine cable provided by an embodiment of the present application.

[0025] Figure 7 Schematic structural diagram of a manufacturing device for a multi-core submarine cable provided by an embodiment of the present application.

[0026] Figure 8 Schematic structural diagram of a structural unit tension control device provided by an embodiment of the present application.

[0027] Figure 9 Top view of a wire dividing and shaping device provided by an embodiment of the present application. Detailed implementation manners

[0028] In order to more clearly understand the above-mentioned objects, features, and advantages of the present application, the present application will be described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the implementation manners of the present application and the features in the implementation manners can be combined with each other.

[0029] Many specific details are set forth in the following description in order to provide a thorough understanding of the present application. The described implementation manners are only a part of the implementation manners of the present application, rather than all of the implementation manners.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific implementation manners, and are not intended to limit the present application.

[0031] It should be further noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element.

[0032] In this application, "at least one" means one or more, and "a plurality" means two or more than two. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural.

[0033] Please refer to Figures 1 to 5 , Figure 1 a cross-sectional view of the multi-core submarine cable provided by this application; Figure 2 a cross-sectional view of the electrical unit provided by this application; Figure 3 a cross-sectional view of the optical unit provided by this application; Figure 4 a cross-sectional view of the buffer and heat insulation structure unit provided by this application; Figure 5 a cross-sectional view of the auxiliary metal unit provided by this application.

[0034] The multi-core submarine cable includes a power cable 1, and the power cable 1 includes an electrical unit 101 for conducting electricity and an optical unit 102 for communication; a buffer and heat insulation structure unit 2, and the buffer and heat insulation structure unit 2 includes a braided rope 22 and a first protective sleeve 23, and the first protective sleeve 23 is extruded outside the braided rope 22; an auxiliary metal unit 4, and the auxiliary metal unit 4 includes a metal tube 24 and a second protective sleeve 25, and the second protective sleeve 25 is extruded outside the metal tube 24; wherein, the cross-sections of the power cable 1 and the buffer and heat insulation structure unit 2 are both circular, the cross-sectional diameter of the power cable 1 is equal to the cross-sectional diameter of the buffer and heat insulation structure unit 2, and the buffer and heat insulation structure unit 2, the auxiliary metal unit 4 and at least two power cables 1 are stranded to form the core of the multi-core submarine cable.

[0035] Compared with the related art, the embodiments of the present application have at least the following advantages: By providing the buffer and heat insulation structure unit 2, it can play a buffer and isolation role during the stranding of multiple power cables 1, effectively avoiding the extrusion force during the stranding of the power cables 1. The buffer and heat insulation structure unit 2 can also reduce the power loss during the operation of the multi-core submarine cable, and can control the operating temperature of the multi-core submarine cable, improving the stability and reliability during the operation of the multi-core submarine cable; By setting the cross-sectional diameter of the power cable 1 to be equal to the cross-sectional diameter of the buffer and heat insulation structure unit 2, it can ensure the roundness of the composite stranding effect and improve the roundness of the finished submarine cable. By providing the auxiliary metal unit 4, the auxiliary metal unit 4 includes a metal tube 24, and oil and gas can be filled for the offshore platform equipment through the metal tube 24, providing power, hydraulic pressure for the subsea equipment, maintaining the transmission of signals and injecting required reagents, ensuring the normal operation of the underwater control system, so that no additional submarine cables need to be set, reducing the production cost of the multi-core submarine cable. In addition, since the power cable 1 includes at least two, it can improve the power transmission capacity of the multi-core submarine cable.

[0036] In some embodiments, the material of the braided rope 22 is polypropylene. The braided rope 22 of this material can make the buffer and heat insulation structure unit 2 have higher strength, thus ensuring the stability of the structure during the stranding of the multi-core submarine cable. In addition, the material of the first protective sheath 23 can be polyethylene, and the present embodiment does not specifically limit the material of the first protective sheath 23.

[0037] In some embodiments, the cross-sectional diameter of the braided rope 22 is equal to 2 / 3 of the cross-sectional diameter of the power cable 1. The braided rope 22 is formed by braiding multiple single-strand high-strength PP ropes and is in a stranded shape; a polyethylene protective sheath 23 is extruded and coated on the outer layer of the braided rope 22. Among them, the extrusion control temperature of the polypropylene PP material is 200 °C, and the extrusion temperature of the polyethylene is 160 °C to 170 °C, ensuring the production stability during the extrusion process of the first protective sheath 23 made of polyethylene material. Finally, the cross-sectional diameter of the power cable 1 is equal to the cross-sectional diameter of the buffer and heat insulation structure unit 2.

[0038] In some embodiments, the metal tube 24 is a stainless steel tube, and the material of the second protective sheath 25 is polyethylene. The auxiliary metal unit 4 plays an auxiliary role in filling oil and gas for the offshore platform equipment, and can also provide power, hydraulic pressure for the subsea equipment, maintain the transmission of signals and inject required reagents, ensuring the normal operation of the underwater control system.

[0039] Please refer to again Figure 2 , the electrical unit 101 includes a conductor 8, and a conductor shielding layer 9, a water tree resistant XLPE insulation layer 10, an insulation shielding layer 11, a first semi-conductive water-resistant tape layer 12, a copper tape shielding layer 13, a second semi-conductive water-resistant tape layer 14, and a third protective sheath 15 that are sequentially wrapped around the outside of the conductor 8 from the inside to the outside.

[0040] In some embodiments, the conductor 8 includes a plurality of round metal wires and a semiconductive water-resistant adhesive; the plurality of round metal wires are tightly pressed and stranded, and the semiconductive water-resistant adhesive fills the plurality of tightly pressed and stranded round metal wires to form the conductor.

[0041] Specifically, the conductor 8 is an extruded conductor structure obtained by tightly pressing and stranding a plurality of round metal wires in multiple layers. During the stranding process, a semiconductive water-resistant adhesive is filled in the gaps between the strands of each stranded wire. The semiconductive water-resistant adhesive is a water-blocking material composed of a semiconductor compound, which is used to replace the semiconductive water-resistant tape in the conventional submarine cable structure to achieve a better longitudinal water-blocking effect.

[0042] The conductor shielding layer 9, the water-tree-resistant XLPE insulating layer 10, and the insulating shielding layer 11 are a cross-linked three-layer co-extruded structure that bears the operating voltage of the submarine cable; the insulating material is a water-tree-resistant XPLE material, which can ensure that the submarine cable does not form water trees and cause insulation extrusion when it enters water, thus ensuring the stability of the circuit; the cross-linked three-layer co-extruded structure undergoes degassing of the core to remove low-molecular gases during the cross-linking reaction of the submarine cable and avoid affecting the performance of the submarine cable.

[0043] The first semiconductive water-resistant tape layer 12, the copper tape shielding layer 13, and the second semiconductive water-resistant tape layer 14 are synchronously wrapped. The first semiconductive water-resistant tape layer 12 and the second semiconductive water-resistant tape layer 14 further play a role in buffering and water-blocking. The copper tape shielding layer 13 is overlapped and wrapped with soft copper tape to achieve a better electromagnetic shielding effect.

[0044] In some embodiments, the third protective sheath 15 is made of polyethylene, thereby providing a better waterproof effect for the electrical unit 101.

[0045] Please refer to again Figure 3 , the optical unit 102 includes an optical fiber unit 16, and an outer sheath 17, a semiconductive inner sheath 18, an optical unit armor layer 19, a water-blocking tape layer 20, and a semiconductive outer sheath 21 that are sequentially wrapped around the outside of the optical fiber unit 16 from the inside to the outside.

[0046] Please refer to again Figure 1 , the power cable 1 includes three electrical units 101 and one optical unit 102; among them, the center lines of the three electrical units 101 form an equilateral triangle, and the optical unit 102 is located in the gap between two adjacent electrical units 101.

[0047] Specifically, after the phase-separated sheath extrusion of the power cable 1 is completed, according to the arrangement position of the three-phase sheath cable core, the three cores (i.e., the three electrical units 101) of the power cable 1 are cabled. The optical unit 102 fills the gap between two adjacent electrical units 101, and the void is filled with a cylindrical polyethylene strip to achieve a better cabled roundness effect. After cabling, an artificial synthetic tape is wrapped around the outer layer of the core to achieve a bundling and rounding effect after the three cores are stranded.

[0048] In some embodiments, the multi-core submarine cable further includes a cable inner sheath 5 wrapped around the outside of the cable core, an armor layer 6 wrapped around the outside of the cable inner sheath 5, an anti-corrosion layer coated on the outside of the armor layer 6, and a cable outer sheath 7 wrapped around the outside of the anti-corrosion layer.

[0049] It should be noted that there are electric field interaction and heating phenomena during the transmission process of the power unit 101. When the multi-core submarine cable is working, the current distribution in the cable core is uneven, and eddy currents will be generated in both the copper tape shielding layer 13 and the armor layer 6, resulting in power loss. At the same time, the temperature of the multi-core submarine cable gradually increases layer by layer from the cable core, copper tape shielding layer 13, third protective sleeve 15, cable inner sheath 5, and armor layer 6 during operation, and reaches equilibrium after a period of time. The increase in temperature affects the performance parameters of the cable. By stranding the buffer and heat insulation structure units 2 in a staggered manner, the power loss during the operation of the multi-core submarine cable can be greatly reduced, and the temperature during the operation of the multi-core submarine cable can be controlled, improving the stability of the multi-core submarine cable during operation.

[0050] Please refer to again Figure 1 , there are four power cables 1, three buffer and heat insulation structure units 2, and two auxiliary metal units 4; among them, the center lines of three of the four power cables 1 form an equilateral triangle, and the other power cable 1 is located at the center of the equilateral triangle; the three buffer and heat insulation structure units 2 are respectively located on the three sides of the equilateral triangle.

[0051] The multi-core submarine cable further includes a circular filling unit 3; the four power cables 1, three buffer and heat insulation structure units 2, and two auxiliary metal units 4 are stranded, and the circular filling unit 3 fills the gaps formed after the stranding of the four power cables 1, three buffer and heat insulation structure units 2, and two auxiliary metal units 4 to form the cable core of the multi-core submarine cable.

[0052] Specifically, the power cables 1, buffer and heat insulation structure units 2, and auxiliary metal units 4 are stranded and combined according to the gap positions. The gap positions are filled with the circular filling unit 3 for cable forming and compound filling to ensure the roundness effect of the cable core of the multi-core submarine cable.

[0053] In some embodiments, the circular filling unit 3 is a polyethylene circular filling strip.

[0054] In some embodiments, the number of power cables 1 is not specifically limited and can be set according to actual needs. The number of buffer and heat insulation structure units 2 is adjusted accordingly according to the change in the number of power cables 1. For example, when there are 5 power cables 1, there are 2 buffer and heat insulation structure units 2.

[0055] Please refer to Figure 6, which is a cross-sectional view of another structure of the multi-core submarine cable provided by the embodiment of the present application. There are 7 power cables 1, and only the electrical unit 101 is arranged inside the power cable 1 to improve the load capacity of the power cable 1. The optical unit 102 and the auxiliary metal unit 4 are arranged in the gaps between adjacent power cables 1.

[0056] For the convenience of understanding, the multi-core submarine cable provided by the embodiment of the present application will be specifically described below:

[0057] Four power cables 1 and three buffer and heat insulation structure units 2 are compounded into a cable. Two auxiliary metal units 4 are filled in the gaps between the power cable 1 and the buffer and heat insulation structure unit 2, and the remaining gaps are filled with a circular filling unit 3 (such as a flexible material circular PE strip + PP filling rope) to ensure better bending flexibility of the multi-core submarine cable. The filling material fills the compounded cable gaps to ensure the roundness of the multi-core submarine cable during compounding into a cable; after cable laying, a layer of braided synthetic tape is wrapped around the outer layer to play the roles of tightening, buffering, and isolation.

[0058] After cable laying, the cable core of the multi-core submarine cable is extruded with an inner cable sheath 5 to ensure better waterproof effect of the multi-core submarine cable; the armor layer 6 is made of steel wires, and the type of steel wires is determined according to the specific water depth requirements during the use of the multi-core submarine cable. For example, conventional galvanized low-carbon steel wires are selected for shallower water depths, medium-carbon galvanized steel wires are selected for deeper water depths, and galvanized high-carbon steel wires are selected for complex usage conditions for armoring to ensure better armoring mechanical properties. An anticorrosive layer is coated on the outer layer of the armor layer 6, and the anticorrosive layer uses modified asphalt for asphalt spraying to ensure that it can be evenly and completely coated on the surface of the armor layer 6.

[0059] Please refer to Figure 7 , which is a schematic structural diagram of the manufacturing device for the multi-core submarine cable provided by the embodiment of the present application.

[0060] The manufacturing device for the multi-core submarine cable includes: a power unit turntable 261, a structure unit reel 263, an auxiliary metal unit reel 262, a structure unit tension control device 265, a wire splitting and shaping device 266, and a cable laying and stranding device 267; the power unit turntable 261 is used to pay out the power cable 1, the structure unit reel 263 is used to pay out the buffer and heat insulation structure unit 2, and the auxiliary metal unit reel 262 is used to pay out the auxiliary metal unit 4; the structure unit tension control device 265 is used to control the tension during the pay-out process of the structure unit reel 265 so that the tension during the pay-out process of the structure unit reel 263 is the same as the tension during the pay-out process of the power unit turntable 261; the wire splitting and shaping device 266 is used to determine the positions of the power cable 1, the buffer and heat insulation structure unit 2, and the auxiliary metal unit 4 according to the cable core structure of the multi-core submarine cable; the cable laying and stranding device 267 is used to strand the power cable 1, the buffer and heat insulation structure unit 2, and the auxiliary metal unit 4 after wire splitting and shaping to form the cable core of the aforementioned multi-core submarine cable.

[0061] Specifically, the manufacturing device for the multi-core submarine cable further includes a filling unit wire reel 264, a stranding and wrapping device 268, an upper turning wheel 269A, and a lower turning wheel 269B. The filling unit wire reel 264 is used for paying off the circular filling unit 3, and the stranding and wrapping device 268 is used for wrapping a layer of braided synthetic tape around the cable core of the multi-core submarine cable formed by stranding, so as to play the roles of tightening, buffering, and isolation.

[0062] As Figure 7 shown, the manufacturing device for the multi-core submarine cable further includes a vertical stranding bottom platform 2610, a vertical stranding first platform 2611, a vertical stranding second platform 2612, and a vertical stranding and twisting platform 2613. The power unit turntable 261, the auxiliary metal unit wire reel 262, and the lower turning wheel 269B are all located on the vertical stranding bottom platform 2610; the structural unit wire reel 263 and the filling unit wire reel 264 are both located on the vertical stranding first platform 2611; the structural unit tension control device 265 is located on the vertical stranding second platform 2612; the wire dividing and shaping device 266 is located on the vertical stranding and twisting platform 2613.

[0063] It can be understood that during the composite stranding process of the multi-core submarine cable, since it includes the stranding of multiple power cables 1, buffer and heat insulation structural units 2, auxiliary metal units 4, and circular filling units 3, each unit has different tension characteristics, and it is difficult to control the forming during conventional stranding and twisting; the internal structure of the buffer and heat insulation structural unit 2 is a high-strength polypropylene braided rope structure, and the outer layer is extruded with a polyethylene sheath, so that while the buffer and heat insulation structural unit 2 has high strength characteristics, its single weight is relatively light and the tension control is relatively small, and the tension control needs to be increased during the stranding and twisting process; the internal structure of the auxiliary metal unit 4 is a stainless steel pipe structure with relatively high strength, and the tension control needs to be reduced during the stranding and twisting process; therefore, during the stranding and twisting process of each unit of the multi-core submarine cable, it is easy to form the position offset of each unit due to different tension controls of each unit, resulting in the difficulty in forming the composite stranding of the multi-core submarine cable, and there is uneven cable tension, thus leading to the cable snake phenomenon.

[0064] Through the manufacturing device for the multi-core submarine cable provided in this embodiment, the power cable 1 pays off through the power unit turntable 261 arranged on the vertical stranding bottom platform 2610, the auxiliary metal unit 4 pays off from the auxiliary metal unit 262 wire reel, and the circular filling unit 3 pays off through the filling unit wire reel 264 arranged on the vertical stranding first platform 2611; due to the particularity of the buffer and heat insulation structural unit 2, after the buffer and heat insulation structural unit 2 pays off through the vertical stranding first platform 2611, it passes through the structural unit tension control device 265 on the vertical stranding second platform 2612, threads to the wire dividing and shaping device 266 on the vertical stranding and twisting platform 2613, and is stranded and combined with the power cable 1, the auxiliary metal unit 4, and the circular filling unit 3 through the stranding and twisting device 267 to form the whole stranded cable core.

[0065] Please refer to Figure 8 Figure 8 , the structural unit tension control device 265 includes a tension control expander 265A, a slewing support wheel 265B, upper and lower limit support devices 265C1 and 265C2, a tension control chain 265D, a slide rail device 265E, and a structural unit wire passing device 265F. The structural unit wire passing device 265F is composed of two sets of parallel guide wheels. The buffer heat insulation structural unit 2 passes through the middle position of the guide wheels. The tension control chain 265D is connected to the tension control expander 265A, and through the slewing support wheel 265B, a reciprocating telescopic motion is realized to control the change of the wire release tension of the buffer heat insulation structural unit 2.

[0066] During the stranding process of the buffer heat insulation structural unit 2, as the vertical stranding equipment rotates, each unit is stranded. There are differences in the tension of the buffer heat insulation structural unit 2, which pushes the structural unit wire passing device 265F. Through the tension control expander 265A and the tension control chain 265D, the tension adjustment change is realized; when the structural unit wire passing device 265F is at the upper limit 265C1, the wire release tension of the buffer heat insulation structural unit 2 is relatively large, which is fed back to the structural unit tension control device 265, and the wire passing device 265F moves downward to reduce the wire release tension of the buffer heat insulation structural unit 2, and the position during the stranding process is well-fitted, ensuring the roundness of the stranded core. When the wire release tension is small, the structural unit wire passing device 265F is at the lower limit, which is fed back to the structural unit tension control device 265, and the structural unit wire passing device 253F moves upward to increase the wire release tension of the buffer heat insulation structural unit 2, ensuring the stability of the stranding process.

[0067] Please refer to Figure 9 Figure 9 , the wire splitting and shaping device 266 is a stranded wire splitting disc. The stranded wire splitting disc includes a power unit limit hole 266A, a structural unit limit hole 266B, an auxiliary metal unit limit hole 266C, and a circular filling unit limit hole 266D. The power cable 1, the buffer heat insulation structural unit 2, the circular filling unit 3, and the auxiliary metal unit 4 pass through the wire splitting and shaping device 266 in sequence according to the multi-core submarine cable structure, thereby ensuring the stability of the stranding process of each unit; the wire splitting and shaping device 266 confirms the distribution of the wire passing holes according to the specific structural position of the cable core.

[0068] Compared with the related technologies, the embodiments of the present application have at least the following advantages: (1) It realizes the transmission of electric power, optical unit communication signals, and the supply of oil pressure signals to underwater equipment for multiple offshore wellhead platforms, greatly saving the raw material input required in the design of conventional submarine cables and reducing the production cost of multi-core submarine cables. (2) It can optimize the structure of the offshore wellhead platform, reduce the size and weight of the offshore wellhead platform, and lower the production and manufacturing cost of the offshore wellhead platform. (3) It greatly reduces the change of the electrical performance parameters of the submarine cable due to the increase in the system temperature during the operation of the submarine cable, and improves the stability and reliability of the submarine cable. (4) By setting the structural unit tension control device 265 and the wire splitting and shaping device 266, the stranding stability of the multi-core submarine cable can be better guaranteed, and the roundness of the stranded wire cores can be ensured.

[0069] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A multi-core submarine cable, characterized in that, Comprising: A power cable, the power cable comprising an electrical unit for conducting electricity and an optical unit for communication; A buffer and heat insulation structure unit, the buffer and heat insulation structure unit comprising a braided rope and a first protective sleeve, the first protective sleeve being extruded outside the braided rope; An auxiliary metal unit, the auxiliary metal unit comprising a metal tube and a second protective sleeve, the second protective sleeve being extruded outside the metal tube; Wherein, the cross-sections of the power cable and the buffer and heat insulation structure unit are both circular, the cross-section diameter of the power cable is equal to the cross-section diameter of the buffer and heat insulation structure unit, and the buffer and heat insulation structure unit, the auxiliary metal unit and at least two of the power cables are stranded to form the core of a multi-core submarine cable.

2. The multi-core submarine cable according to claim 1, characterized in that, The electrical unit comprises a conductor, and a conductor shielding layer, a water-tree resistant XLPE insulation layer, an insulation shielding layer, a first semi-conductive water-blocking tape layer, a copper tape shielding layer, a second semi-conductive water-blocking tape layer and a third protective sleeve which are sequentially wrapped around the outside of the conductor from inside to outside.

3. The multi-core submarine cable according to claim 2, wherein, The conductor comprises a plurality of round metal wires and a semi-conductive water-blocking glue; The plurality of round metal wires are tightly pressed and stranded, and the semi-conductive water-blocking glue fills the plurality of round metal wires after being tightly pressed and stranded to form the conductor.

4. The multi-core submarine cable according to claim 1, characterized in that, The optical unit comprises an optical fiber unit, and an outer sleeve tube, a semi-conductive inner sheath, an optical unit armor layer, a water-blocking tape layer and a semi-conductive outer sheath which are sequentially wrapped around the outside of the optical fiber unit from inside to outside.

5. The multi-core submarine cable according to claim 1, characterized in that, There are four of the power cables, three of the buffer and heat insulation structure units, and two of the auxiliary metal units; Wherein, the center lines of three of the four power cables form an equilateral triangle, and the other power cable is located at the center of the equilateral triangle; the three buffer and heat insulation structure units are respectively located on the three sides of the equilateral triangle.

6. The multi-core submarine cable according to claim 5, characterized in that, The multi-core submarine cable further comprises a circular filling unit; The four power cables, the three buffer and heat insulation structure units and the two auxiliary metal units are stranded, and the circular filling unit fills the gaps after the four power cables, the three buffer and heat insulation structure units and the two auxiliary metal units are stranded to form the core of the multi-core submarine cable.

7. The multi-core submarine cable according to claim 1, wherein, The power cable comprises three of the electrical units and one of the optical units; Wherein, the center lines of the three electrical units form an equilateral triangle, and the optical unit is located in the gap between two adjacent electrical units.

8. The multi-core submarine cable according to claim 1, characterized in that, The multi-core submarine cable further comprises a cable inner sheath wrapped around the outside of the core, an armor layer wrapped around the outside of the cable inner sheath, an anti-corrosion layer coated on the outside of the armor layer, and a cable outer sheath wrapped around the outside of the anti-corrosion layer.

9. A manufacturing device for a multi-core submarine cable, characterized in that, Comprising: A power unit turntable, a structure unit reel, an auxiliary metal unit reel, a structure unit tension control device, a wire splitting and shaping device and a stranding and twisting device; The power unit turntable is used for paying out the power cable, the structure unit reel is used for paying out the buffer and heat insulation structure unit, and the auxiliary metal unit reel is used for paying out the auxiliary metal unit; The structural unit tension control device is used to control the tension during the wire pay-off process of the structural unit wire reel, so that the tension during the wire pay-off process of the structural unit wire reel is the same as the tension during the wire pay-off process of the power unit turntable; The wire splitting and shaping device is used to determine the positions of the power cable, the buffer and heat insulation structural unit, and the auxiliary metal unit according to the core structure of the multi-core submarine cable; The cable stranding device is used to strand the power cable, the buffer and heat insulation structural unit, and the auxiliary metal unit after wire splitting and shaping to form the core of the multi-core submarine cable according to any one of claims 1 to 8.

10. The manufacturing device of the multi-core submarine cable according to claim 9, characterized in that, The structural unit tension control device includes a tension control expander, a slewing support wheel, a tension control chain, and a structural unit wire passing device; The structural unit wire passing device includes two groups of parallel guide wheels, and the buffer and heat insulation structural unit passes through the middle of the guide wheels; the tension control expander and the tension control chain are connected, and reciprocating telescopic movement is realized through the slewing support wheel to adjust the wire pay-off tension of the structural unit wire reel.

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