Marine umbilical cable and device

Abstract

The present application belongs to the technical field of marine cables. Provided are a marine umbilical cable and a device. The marine umbilical cable comprises several first cable units, several second cable units, a first shielding layer and a second shielding layer, wherein the first cable units and the second cable units are respectively stranded into cables, and there is a conductive fluid between the first cable units and the second cable units; the first shielding layer completely covers the peripheral side of the several first cable units, and is located between the first cable units and the second cable units; the second shielding layer completely covers the peripheral side of the several second cable units; and the surfaces of the first shielding layer and the second shielding layer both have wrinkles. Using the separation design of medium-voltage and low-voltage power transmission structures, and using independent shielding measures for medium and low voltages reduce the electromagnetic interference between medium and low voltages, improve the fatigue resistance of the umbilical cable, also improve the pressure resistance of the umbilical cable under high water pressure, and reduce the radial shrinkage of the umbilical cable.

Description

A marine umbilical cable and equipment

[0001] This application claims priority to Chinese Patent Application No. 202410501915.4, filed on April 24, 2024, entitled “A Marine Umbilical Cable and Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of marine cable technology, and more particularly to a marine umbilical cable and equipment. Background Technology

[0003] Currently, the power and monitoring systems of ships, marine engineering projects, and offshore platforms generally use independent cable systems. With the continuous emergence of new marine applications such as deep-sea mining and hydrate extraction, the demand for umbilical cables for high-power equipment in deep-sea environments is increasing.

[0004] Because such marine engineering equipment typically has high power, its operating voltage is also high, and it requires control cables of various specifications to meet underwater communication and control functions. As the "umbilical cord" connecting the mother ship and underwater equipment, the umbilical cable has complex specifications and is also used for launching / retrieving equipment or being tied to recovery conduits. Therefore, the location, condition, and stress of the umbilical cable are of great concern.

[0005] However, currently used metal-armored cables are generally suitable for lighter or simpler underwater equipment, and there is no application of marine umbilical cables suitable for high-depth, high-power, heavy-load applications. Current umbilical cables generally operate at relatively low voltages, typically not exceeding 3.3kV, with relatively simple structures and weak electromagnetic interference. However, when the operating voltage of the umbilical cable rises to medium voltage, and low-voltage control wires are mixed within the cable, the electromagnetic interference between the cores becomes stronger, requiring better electromagnetic shielding measures. Furthermore, due to the operating characteristics, optical fibers need to be added to enhance the monitoring of cable stress, temperature, and condition. Summary of the Invention

[0006] This application provides a marine umbilical cable and equipment. For umbilical cables transmitting mixed voltages, a separate design for medium-voltage and low-voltage transmission structures is adopted, and independent shielding measures are used for the medium and low voltages to reduce electromagnetic interference between them. Furthermore, both the medium-voltage and low-voltage cables employ a corrugated shielding layer for magnetic field shielding, reducing the bending radius of the umbilical cable, improving its fatigue resistance, enhancing its pressure resistance under high water pressure, and reducing radial shrinkage.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] The first aspect of this application provides a marine umbilical cable, comprising:

[0009] A plurality of first cable units are twisted together to form a cable, and there is a conductive fluid between the plurality of first cable units;

[0010] A plurality of second cable units are twisted together to form a cable, and there is a conductive fluid between the plurality of second cable units, and the plurality of second cable units are located on the outer periphery of the plurality of first cable units;

[0011] The first shielding layer completely covers the outer periphery of the cable after the first cable units are twisted together, and the first shielding layer is located between the first cable units and the second cable units.

[0012] The second shielding layer completely covers the outer periphery of the cable after several second cable units are twisted together.

[0013] Both the first and second shielding layers have wrinkles on their surfaces.

[0014] Based on the above technical solution, the following improvements can be made to this application.

[0015] In one possible implementation, each first cable unit includes: a plurality of control lines and at least one signal line;

[0016] Several control lines and signal lines are twisted together to form a cable, and the outer periphery of the cable formed by twisting the control lines and signal lines together has a first insulating layer.

[0017] In one possible implementation, the inner periphery of several first cable units has fillers;

[0018] The filler is used to support several first cable units.

[0019] In one possible implementation, a first inner sheath is provided between several first cable units and a first shielding layer;

[0020] The outer periphery of the first shielding layer has a second inner sheath.

[0021] In one possible implementation, each second cable unit includes: a plurality of power lines, a semiconductive shielding layer, a second insulating layer, and an insulating shielding layer;

[0022] Several power lines are twisted together to form a cable, and a semi-conductive shielding layer is wrapped around the outer periphery of the cable after the power lines are twisted together.

[0023] The second insulating layer is located on the outer periphery of the semiconductive shielding layer, and the insulating shielding layer is located on the outer periphery of the second insulating layer.

[0024] In one possible implementation, the marine umbilical cable also includes at least three sensing optical fibers;

[0025] The three sensing optical fibers are respectively located in the gaps between several second cable units and the second shielding layer, and the three sensing optical fibers are evenly distributed between several second cable units and the second shielding layer.

[0026] Each sensing fiber has a third insulating layer on its outer periphery.

[0027] In one possible implementation, the marine umbilical cable also includes at least three ground wires;

[0028] The three ground wires and the three sensing optical fibers are located in different gaps between several second cable units and the second shielding layer, and the three ground wires are evenly distributed between several second cable units and the second shielding layer.

[0029] Each ground wire has a fourth insulating layer on its outer periphery.

[0030] In one possible implementation, the marine umbilical cable further includes: a first outer sheath and a second outer sheath;

[0031] The first outer sheath is located on the outer periphery of the second shielding layer;

[0032] The second outer sheath is located on the outermost layer of the entire marine umbilical cable.

[0033] In one possible implementation, the marine umbilical cable also includes: a reinforcing layer;

[0034] The reinforcing layer is located between the first outer sheath and the second outer sheath.

[0035] A second aspect of this application provides an apparatus comprising the aforementioned marine umbilical cable.

[0036] This application provides a marine umbilical cable and device. The marine umbilical cable includes a plurality of first cable units, a plurality of second cable units, a first shielding layer, and a second shielding layer. The plurality of first cable units are stranded into a cable, and a conductive fluid is present between the plurality of first cable units. The plurality of second cable units are stranded into a cable, and a conductive fluid is present between the plurality of second cable units, which are located on the outer periphery of the plurality of first cable units. The first shielding layer completely covers the outer periphery of the stranded cable of the plurality of first cable units and is located between the plurality of first cable units and the plurality of second cable units. The second shielding layer completely covers the outer periphery of the stranded cable of the plurality of second cable units. Both the surfaces of the first and second shielding layers have pleats. The device includes the aforementioned marine umbilical cable. Thus, this application enables the separate design of medium-voltage and low-voltage transmission structures for umbilical cables transmitting mixed voltages, and employs independent shielding measures for medium and low voltages to reduce electromagnetic interference between the medium and low voltages. In addition, both medium-voltage and low-voltage cables use a shielding layer with pleats on the surface for magnetic field shielding, which reduces the bending radius of the umbilical cable, improves the fatigue resistance of the umbilical cable, enhances the pressure resistance of the umbilical cable under high water pressure, and reduces the radial shrinkage of the umbilical cable.

[0037] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0039] Figure 1 is a schematic diagram of the structure of a marine umbilical cable provided in an embodiment of this application.

[0040] Explanation of reference numerals in the attached diagram: 100 - Marine umbilical cable; 200 - First cable unit; 210 - Control line; 220 - Signal line; 230 - First insulation layer; 240 - Filler; 300 - Second cable unit; 310 - Power line; 320 - Semi-conductive shielding layer; 330 - Second insulation layer; 340 - Insulating shielding layer; 400 - First shielding layer; 410 - First inner sheath; 420 - Second inner sheath; 500 - Second shielding layer; 510 - First outer sheath; 520 - Second outer sheath; 530 - Reinforcing layer; 600 - Sensor fiber; 610 - Third insulation layer; 700 - Ground wire; 710 - Fourth insulation layer. Detailed Implementation

[0041] As described in the background section, currently commonly used metal-armored cables are generally suitable for lightweight or relatively simple underwater equipment, while marine umbilical cables suitable for high-depth, high-power, and heavy-load applications are not yet in use. Current umbilical cables typically operate at low voltages, usually not exceeding 3.3kV, have relatively simple structures, and exhibit weak electromagnetic interference. However, when the operating voltage of the umbilical cable rises to medium voltage, and low-voltage control wires are mixed within the cable, the electromagnetic interference between the cores increases, requiring better electromagnetic shielding measures. Furthermore, due to the operational characteristics, optical fibers need to be added to enhance the monitoring of cable stress, temperature, and condition.

[0042] To address the aforementioned technical problems, this application provides a marine umbilical cable and device. The marine umbilical cable includes a plurality of first cable units, a plurality of second cable units, a first shielding layer, and a second shielding layer. The plurality of first cable units are twisted into a cable, and a conductive fluid is present between the plurality of first cable units. The plurality of second cable units are twisted into a cable, and a conductive fluid is present between the plurality of second cable units, which are located on the outer periphery of the plurality of first cable units. The first shielding layer completely covers the outer periphery of the stranded cable of the plurality of first cable units and is located between the plurality of first cable units and the plurality of second cable units. The second shielding layer completely covers the outer periphery of the stranded cable of the plurality of second cable units. Both the surfaces of the first and second shielding layers have pleats. The device includes the aforementioned marine umbilical cable. Thus, this application can adopt a separate design for medium-voltage and low-voltage transmission structures for umbilical cables transmitting mixed voltages, and employ independent shielding measures for medium and low voltages to reduce electromagnetic interference between the medium and low voltages. In addition, both medium-voltage and low-voltage cables use a shielding layer with pleats on the surface for magnetic field shielding, which reduces the bending radius of the umbilical cable, improves the fatigue resistance of the umbilical cable, enhances the pressure resistance of the umbilical cable under high water pressure, and reduces the radial shrinkage of the umbilical cable.

[0043] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of 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, and 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.

[0044] This application provides a marine umbilical cable and equipment. For umbilical cables transmitting mixed voltages, a separate design is adopted for medium-voltage and low-voltage transmission structures, and independent shielding is used for the medium and low voltages to reduce electromagnetic interference between them. Furthermore, both the medium-voltage and low-voltage cables employ a corrugated shielding layer for magnetic field shielding, reducing the bending radius of the umbilical cable, improving its fatigue resistance, enhancing its pressure resistance under high water pressure, and reducing radial shrinkage. The specific structure of the marine umbilical cable and equipment provided in this application embodiment will be described below with reference to the accompanying drawings.

[0045] Referring to Figure 1, a first aspect of this application provides a marine umbilical cable 100. In this embodiment, the marine umbilical cable 100 may include a first cable unit 200, a second cable unit 300, a first shielding layer 400, and a second shielding layer 500. In one possible implementation, the number of first cable units 200 and second cable units 300 may be pluralityd; this application does not limit the number of first cable units 200 and second cable units 300. In this embodiment, the first cable unit 200 may be a low-voltage cable, and the second cable unit 300 may be a medium-voltage cable. A plurality of first cable units 200 may be stranded into a low-voltage cable, and a conductive fluid may be present between the plurality of first cable units 200. Correspondingly, a plurality of second cable units 300 may be stranded into a high-voltage cable, and a conductive fluid may also be present between the plurality of second cable units 300, and the plurality of second cable units 300 may be located on the outer periphery of the plurality of first cable units 200. In one possible implementation, the conductive fluid can be a semi-conductive resistive adhesive. This fluid can be used to fill the spaces between several first cable units 200 and several second cable units 300. On the one hand, this makes the core structure of the marine umbilical cable 100 round and compact, reducing the radial shrinkage of the entire marine umbilical cable 100 under high water pressure. On the other hand, the semi-conductive resistive adhesive can completely encapsulate the cores of the first cable units 200 and the second cable units 300, thereby balancing the external electric field and ensuring complete contact with the first shielding layer 400 and the second shielding layer 500, thus improving anti-interference capabilities.

[0046] Referring again to Figure 1, in this embodiment, the first shielding layer 400 completely covers the outer periphery of the bundled first cable units 200, and the first shielding layer 400 can be located between the bundled first cable units 200 and the bundled second cable units 300, thereby separating the first cable units 200 and the second cable units 300. Correspondingly, the second shielding layer 500 completely covers the outer periphery of the bundled second cable units 300. Thus, the first shielding layer 400 and the second shielding layer 500 enable independent shielding for the bundled first cable units 200 and the bundled second cable units 300, reducing electromagnetic interference between them.

[0047] Based on the above embodiments, the surfaces of both the first shielding layer 400 and the second shielding layer 500 may have corrugations. In one possible implementation, both the first shielding layer 400 and the second shielding layer 500 may be corrugated copper tape. It is understood that corrugated copper tape has good flexibility and fatigue resistance. The presence of several corrugations on the surfaces of the first shielding layer 400 and the second shielding layer 500 can prevent easy breakage, reduce the bending radius of the umbilical cable, improve the fatigue resistance of the umbilical cable, enhance the compressive strength of the umbilical cable under high water pressure, and reduce the radial shrinkage of the umbilical cable.

[0048] Referring again to Figure 1, based on the above embodiments, each first cable unit 200 may include: a plurality of control lines 210 and at least one signal line 220. In one possible implementation, the number of control lines 210 may be a plurality, and the number of signal lines 220 may be at least one; therefore, the number of signal lines 220 may be one or more. This application does not limit the number of control lines 210 and signal lines 220. In this embodiment, the plurality of control lines 210 and signal lines 220 are twisted together to form the cable core of the first cable unit 200, and the signal line 220 may be a communication optical unit, i.e., transmitting signals via optical fiber. Thus, transmission via optical fiber ensures that the signal line 220 is not affected by electromagnetic fields. Furthermore, the outer periphery of the twisted cable of the plurality of control lines 210 and signal lines 220 may have a first insulating layer 230. The first insulating layer 230 can protect the control lines 210 and signal lines 220.

[0049] Referring again to Figure 1, based on the above embodiment, the inner periphery of several first cable units 200 may have a filler 240. In one possible implementation, the filler 240 may be a cylindrical structure, which is not limited herein. It is understood that the filler 240 can be used to support several first cable units 200. Thus, from the radial cross-section of the first cable unit 200, the several first cable units 200 can be arranged in a circumferential pattern, facilitating the coverage of the first shielding layer 400.

[0050] Referring again to Figure 1, based on the above embodiment, a first inner sheath 410 may be provided between several first cable units 200 and the first shielding layer 400. The first inner sheath 410 may be fitted to the outer wall of each first cable unit 200, and the gap between the first inner sheath 410 and the first cable unit 200 is filled with a conductive fluid. It is understood that the first inner sheath 410 can be used to protect the first cable unit 200. In one possible implementation, the fluid, the first inner sheath 410, and the first shielding layer 400 can together form the shielding structure of the first cable unit 200. The first shielding layer 400 may be made of smooth copper strip that has undergone an online corrugation process and is longitudinally wrapped around the first inner sheath 410, using an overlapping method to achieve full coverage of the first cable unit 200. Furthermore, to improve the pressure resistance of the first shielding layer 400 at great water depths, a conductive fluid is applied to fill the gaps within the folds of the first shielding layer 400 during longitudinal wrapping. Furthermore, the first shielding layer 400 needs to be grounded at both ends of the first cable unit 200 to reduce the induced voltage around the low-voltage cable formed by the plurality of first cable units 200 to zero. In one possible implementation, the first inner sheath 410 can serve as a padding layer for the first shielding layer 400, while also maintaining electrical contact between the first cable unit 200 and the first shielding layer 400.

[0051] Referring again to Figure 1, based on the above embodiment, the outer periphery of the first shielding layer 400 may have a second inner sheath 420. The second inner sheath 420 may be made of an insulating material. In one possible implementation, the second inner sheath 420 may be an extruded plastic layer on the outside of the first shielding layer 400, enabling electrical isolation between the first cable unit 200 and the second cable unit 300.

[0052] Referring again to Figure 1, based on the above embodiments, each second cable unit 300 may include: a power line 310, a semi-conductive shielding layer 320, a second insulation layer 330, and an insulating shielding layer 340. In one possible implementation, the number of power lines 310 can be plurality, and this application does not limit the number of power lines 310. In this embodiment, a plurality of power lines 310 are twisted into a cable, and the semi-conductive shielding layer 320 can cover the outer periphery of the cable formed by the twisted power lines 310. Correspondingly, the second insulation layer 330 can be located on the outer periphery of the semi-conductive shielding layer 320, and the insulating shielding layer 340 can be located on the outer periphery of the second insulation layer 330. Thus, a plurality of power lines 310, a semi-conductive shielding layer 320, a second insulation layer 330, and an insulating shielding layer 340 can be arranged sequentially from the inside out to form the second cable unit 300.

[0053] Referring again to Figure 1, based on the above embodiment, a plurality of first cable units 200 can serve as fillers located on the inner periphery of a plurality of second cable units 300. In one possible implementation, the plurality of first cable units 200 can be arranged in a circumferential pattern, allowing them to support the plurality of second cable units 300. Thus, from the radial cross-section of the second cable units 300, the plurality of second cable units 300 can also be arranged in a circumferential pattern, facilitating the coverage of the second shielding layer 500.

[0054] Referring again to Figure 1, based on the above embodiments, the marine umbilical cable 100 may further include: sensing optical fibers 600. In one possible implementation, the number of sensing optical fibers 600 can be at least three; however, this application does not limit the number of sensing optical fibers 600. In this embodiment, three sensing optical fibers 600 are used as an example. The three sensing optical fibers 600 can be located in the gaps between several second cable units 300 and the second shielding layer 500, and are evenly distributed between the several second cable units 300 and the second shielding layer 500. Thus, from the radial cross-section of the second cable unit 300, since the several second cable units 300 are arranged in a circular pattern, the cross-section of the three sensing optical fibers 600 can be arranged in an equilateral triangular shape, facilitating that the sensing optical fibers 600 can completely cover the entire marine umbilical cable 100, thereby achieving omnidirectional signal transmission. In addition, each sensing fiber 600 may have a third insulating layer 610 on its outer periphery, which can protect the sensing fiber 600.

[0055] Based on the above embodiments, in one possible implementation, each sensing fiber 600 can be composed of an optical fiber, a protective layer, aramid fibers, and an outer sheath. The sensing fiber 600 can be wound around the outer layer of several second cable units 300, and by combining a distributed optical fiber stress testing device, the state changes of the marine umbilical cable 100 can be inferred by measuring the phase stress changes of the three sensing fibers 600.

[0056] Referring again to Figure 1, based on the above embodiments, the marine umbilical cable 100 may further include a ground wire 700. In one possible implementation, the number of ground wires 700 may be at least three; this application does not limit the number of ground wires 700. In this embodiment, three ground wires 700 are used as an example. It can be understood that the three ground wires 700 may also be located in different gaps between several second cable units 300 and the second shielding layer 500, and the three ground wires 700 may be evenly distributed between the several second cable units 300 and the second shielding layer 500. In one possible implementation, the three ground wires 700 and the three sensing optical fibers 600 may be located in different gaps between several second cable units 300 and the second shielding layer 500, and the three ground wires 700 and the three sensing optical fibers 600 may be spaced apart and evenly distributed in the different gaps between the several second cable units 300 and the second shielding layer 500. Additionally, each ground wire 700 may have a fourth insulating layer 710 on its outer periphery, which can protect the ground wire 700.

[0057] Referring again to Figure 1, based on the above embodiment, several power lines 310, sensing optical fibers 600, and ground wires 700 are twisted into a cable and wound around the outer periphery of the first cable unit 200 to form the core of the second cable unit 300. In one possible implementation, the semi-conductive shielding layer 320, the fluid, the ground wire 700, and the second shielding layer 500 in the power lines 310 can together form the shielding structure of the second cable unit 300. The second shielding layer 500 can be made by longitudinally wrapping several second cable units 300 with smooth copper strip through an online corrugating process, using an overlapping method to achieve full coverage of the second cable units 300. Furthermore, to improve the pressure resistance of the second shielding layer 500 at great water depths, a conductive fluid is applied to fill the gaps in the folds of the second shielding layer 500 during longitudinal wrapping. Additionally, the second shielding layer 500 needs to be grounded at both ends of the second cable unit 300 to reduce the induced voltage around the medium-voltage cable formed by the several second cable units 300 to zero.

[0058] Referring again to Figure 1, based on the above embodiment, the marine umbilical cable 100 may further include a first outer sheath 510 and a second outer sheath 520. The first outer sheath 510 may be located on the outer periphery of the second shielding layer 500, while the second outer sheath 520 is located on the outermost layer of the entire marine umbilical cable 100. In one possible implementation, both the first outer sheath 510 and the second outer sheath 520 may be made of insulating material. It is understood that the first outer sheath 510 may be an extruded plastic layer on the outside of the second shielding layer 500. This protects several second cable units 300, sensing optical fibers 600, and ground wires 700, and also facilitates watertight treatment of the marine umbilical cable 100 at its underwater terminal. Correspondingly, the second outer sheath 520 may be an extruded plastic layer located on the outermost layer, further facilitating watertight treatment of the marine umbilical cable 100 at its underwater terminal. Both the first outer sheath 510 and the second outer sheath 520 have a certain thickness and good compressive strength, and the extruded surface is mechanically or chemically sealed to prevent seawater from entering the interior of the marine umbilical cable 100.

[0059] Referring again to Figure 1, based on the above embodiment, the marine umbilical cable 100 may further include a reinforcing layer 530. The reinforcing layer 530 may be located between the first outer sheath 510 and the second outer sheath 520. In one possible implementation, the reinforcing layer 530 may be made of high-strength fibers. Exemplarily, it may be made of materials such as aramid or ultra-high molecular weight polyethylene, providing sufficient strength for the load-bearing capacity of the marine umbilical cable 100 through winding or braiding. It is understood that the second outer sheath 520 may be located on the outer periphery of the reinforcing layer 530, and the second outer sheath 520 may be used to protect the reinforcing layer 530.

[0060] Of course, in some embodiments, the first shielding layer 400 and the second shielding layer 500 can also be made of copper wire braid. Furthermore, the conductive fluid can also be made of semi-conductive resistive yarn, etc. In one possible implementation, an independent shielding layer and a sheath layer can be added to the outer periphery of the power line 310 to further electromagnetically shield and protect the power line 310.

[0061] A second aspect of this application provides a device (not shown in the figures) that may include the aforementioned marine umbilical cable 100. It is understood that this device can be applied to fields such as deep-sea scientific research, deep-sea mining, hydrate extraction, and deep-sea observation systems.

[0062] In this embodiment, a plurality of control lines 210 and signal lines 220 constitute an inner low-voltage cable core. The outer periphery of the low-voltage cable core has an extruded first inner sheath 410, and a first shielding layer 400 is longitudinally covered on the outer periphery of the first inner sheath 410. The fluid inside the low-voltage cable core, the first inner sheath 410, and the first shielding layer 400 together constitute the low-voltage cable core shielding structure. Additionally, a plurality of power lines 310 and ground lines 700 are wound around the outer layer of the low-voltage cable core, forming an outer medium-voltage cable core together with the sensing optical fiber 600. The outer periphery of the medium-voltage cable core is longitudinally covered with a second shielding layer 500. The fluid inside the medium-voltage cable core, the semi-conductive shielding layer 320 in the power lines 310, the ground line 700, and the second shielding layer 500 together constitute the medium-voltage cable core shielding structure. In this way, the low-voltage shielding structure and the medium-voltage shielding structure are independent of each other. The first shielding layer 400 and the second shielding layer 500 are both 100% fully covered to avoid electromagnetic interference between low voltage and medium voltage. Both types of shielding structures are grounded at both ends of the marine umbilical cable 100.

[0063] In this embodiment, the first shielding layer 400 and the second shielding layer 500, in addition to providing electromagnetic shielding, also exhibit good bending performance, increasing the fatigue resistance of the marine umbilical cable 100. They also provide some pressure resistance in deep-water environments, reducing radial shrinkage of the cable under high water pressure. Furthermore, this application uses uniformly distributed sensing optical fibers 600 wound around the outer periphery of the medium-voltage cable core, improving the tensile and bending resistance of the entire marine umbilical cable 100. Combined with a stress testing device, changes in phase stress can be used to infer the state changes of the marine umbilical cable 100. Semiconductor resistive adhesive is used to fill the gaps between the first cable unit 200 and the second cable unit 300, and between the first shielding layer 400 and the second shielding layer 500. This ensures that the low-voltage and medium-voltage cable cores have a rounded and compact structure, and that the semiconductor resistive adhesive completely covers the cable core, balancing the external electric field and ensuring complete contact with the first shielding layer 400 and the second shielding layer 500, thus enhancing anti-interference capabilities.

[0064] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0065] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0066] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0067] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0068] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A marine umbilical cable, characterized in that, include: A plurality of first cable units are twisted together to form a cable, and there is a conductive fluid between the plurality of first cable units; A plurality of second cable units are twisted together to form a cable, a conductive fluid is present between the plurality of second cable units, and the plurality of second cable units are located on the outer periphery of the plurality of first cable units; The first shielding layer completely covers the outer periphery of the bundled cable of the plurality of first cable units, and the first shielding layer is located between the plurality of first cable units and the plurality of second cable units. The second shielding layer completely covers the outer periphery of the cable formed by twisting several second cable units together. Both the first shielding layer and the second shielding layer have wrinkles on their surfaces.

2. The marine umbilical cable according to claim 1, characterized in that, Each of the first cable units includes: a plurality of control lines and at least one signal line; The plurality of control lines and the signal lines are twisted together to form a cable, and the outer periphery of the plurality of control lines and the signal lines after being twisted together to form a cable has a first insulating layer.

3. The marine umbilical cable according to claim 2, characterized in that, The inner circumferential sides of several of the first cable units have fillers; The filler is used to support several of the first cable units.

4. The marine umbilical cable according to claim 3, characterized in that, A first inner sheath is provided between several of the first cable units and the first shielding layer; The outer periphery of the first shielding layer has a second inner sheath.

5. The marine umbilical cable according to claim 4, characterized in that, Each of the second cable units includes: a plurality of power lines, a semiconductive shielding layer, a second insulating layer, and an insulating shielding layer; A plurality of the power lines are twisted together to form a cable, and the semi-conductive shielding layer covers the outer periphery of the plurality of power lines after they are twisted together to form a cable; The second insulating layer is located on the outer periphery of the semiconductive shielding layer, and the insulating shielding layer is located on the outer periphery of the second insulating layer.

6. The marine umbilical cable according to claim 5, characterized in that, The marine umbilical cable also includes: at least three sensing optical fibers; The three sensing optical fibers are respectively located in the gaps between the second cable units and the second shielding layer, and the three sensing optical fibers are evenly distributed between the second cable units and the second shielding layer. Each of the sensing optical fibers has a third insulating layer on its outer periphery.

7. The marine umbilical cable according to claim 6, characterized in that, The marine umbilical cable also includes: at least three ground wires; The three ground wires and the three sensing optical fibers are respectively located in different gaps between the second cable units and the second shielding layer, and the three ground wires are evenly distributed between the second cable units and the second shielding layer. Each of the ground wires has a fourth insulating layer on its outer periphery.

8. The marine umbilical cable according to claim 7, characterized in that, The marine umbilical cable further includes: a first outer sheath and a second outer sheath; The first outer sheath is located on the outer periphery of the second shielding layer; The second outer sheath is located on the outermost layer of the entire marine umbilical cable.

9. The marine umbilical cable according to claim 8, characterized in that, The marine umbilical cable also includes: a reinforcing layer; The reinforcing layer is located between the first outer sheath and the second outer sheath.

10. A device, characterized in that, Includes the marine umbilical cable as described in any one of claims 1-9.

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