A marine umbilical cable and apparatus

Abstract

The application provides a kind of marine umbilical cable and equipment, belong to marine cable technical field.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 first cable unit and the second cable unit are twisted into a cable respectively, and the first cable unit and the second cable unit have a conductive fluid between them.The first shielding layer completely covers the outer circumferential side of the plurality of first cable units, and the first shielding layer is located between the first cable unit and the second cable unit.The second shielding layer completely covers the outer circumferential side of the plurality of second cable units.The surface of the first shielding layer and the second shielding layer both have wrinkles.The medium-voltage transmission and low-voltage transmission structure are separated and designed, and the medium-voltage and low-voltage independent shielding measures are adopted, reducing the electromagnetic interference between medium-voltage and low-voltage, improving the fatigue resistance of the umbilical cable, also improving the compression resistance of the umbilical cable under high water pressure, and reducing the radial contraction of the umbilical cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine cables, in particular to a marine umbilical cable and equipment. BACKGROUND

[0002] The existing power systems and monitoring systems of warships, marine engineering and offshore platforms generally use independent cable systems. With the continuous emergence of new marine application scenarios such as deep-sea mining and hydrate exploitation, the demand for umbilical cables for deep-sea high-power equipment is increasing.

[0003] Among them, since such marine engineering equipment generally has high power, the working voltage of the equipment is also high, and multiple specifications of control lines are needed to meet the communication and control functions under water. As the "umbilical cord" connecting the mother ship and the underwater equipment, the specification of the umbilical cable is relatively complex, and the umbilical cable is also used for hoisting / recovering equipment or binding on the recovery hard pipe. Therefore, the position state and stress condition of the umbilical cable are also concerned.

[0004] However, the commonly used metal armored cable at present is generally suitable for underwater equipment with lighter weight or simpler function, and there is no application of marine umbilical cable suitable for large water depth, large power and heavy load. The working voltage of the current umbilical cable is generally low, usually not more than 3.3kV, the structure is relatively simple, and the electromagnetic interference is weak. However, when the working voltage of the umbilical cable is raised to medium voltage, and the low-voltage control line is mixed in the cable, the electromagnetic interference between the cores is strong, and better electromagnetic shielding measures are needed. In addition, due to the working characteristics, optical fibers need to be added to strengthen the monitoring of cable stress, temperature and state. SUMMARY

[0005] The present application provides a marine umbilical cable and equipment, for the umbilical cable of different voltage mixed power transmission, adopts the structure separation design of medium voltage power transmission and low voltage power transmission, and adopts the measures of independent shielding of medium and low voltage to reduce the electromagnetic interference between medium and low voltage. In addition, the medium voltage cable and the low voltage cable both adopt the shielding layer with wrinkles on the surface for magnetic field shielding, which reduces the bending radius of the umbilical cable, improves the fatigue resistance of the umbilical cable, also improves the pressure resistance of the umbilical cable under high water pressure, and reduces the radial contraction of the umbilical cable.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme:

[0007] The first aspect of the present application provides a marine umbilical cable, comprising:

[0008] A plurality of first cable units are twisted into a cable, and the plurality of first cable units have a conductive fluid therebetween;

[0009] a plurality of second cable units, the plurality of second cable units being twisted into a cable, the plurality of second cable units having electrically conductive fluid therebetween, and the plurality of second cable units being located at an outer circumferential side of the plurality of first cable units;

[0010] a first shielding layer, the first shielding layer completely covering an outer circumferential side of the plurality of first cable units after being twisted into a cable, and the first shielding layer being located between the plurality of first cable units and the plurality of second cable units;

[0011] a second shielding layer, the second shielding layer completely covering an outer circumferential side of the plurality of second cable units after being twisted into a cable;

[0012] surfaces of the first shielding layer and the second shielding layer each have a wrinkle.

[0013] Based on the technical solution described above, the present application can also be improved as follows.

[0014] In a possible implementation manner, each first cable unit comprises a plurality of control lines and at least one signal line.

[0015] The plurality of control lines and the signal line are twisted into a cable, and an outer circumferential side of the plurality of control lines and the signal line after being twisted into a cable has a first insulating layer.

[0016] In a possible implementation manner, an inner circumferential side of the plurality of first cable units has a filler.

[0017] The filler is used to support the plurality of first cable units.

[0018] In a possible implementation manner, a first inner sheath is located between the plurality of first cable units and the first shielding layer.

[0019] An outer circumferential side of the first shielding layer has a second inner sheath.

[0020] In a possible implementation manner, each second cable unit comprises a plurality of power lines, a semi-conductive shielding layer, a second insulating layer, and an insulating shielding layer.

[0021] The plurality of power lines are twisted into a cable, and the semi-conductive shielding layer covers an outer circumferential side of the plurality of power lines after being twisted into a cable.

[0022] The second insulating layer is located at an outer circumferential side of the semi-conductive shielding layer, and the insulating shielding layer is located at an outer circumferential side of the second insulating layer.

[0023] In a possible implementation manner, the marine umbilical cable further comprises at least three sensing optical fibers; the three sensing optical fibers are respectively located in gaps between the plurality of second cable units and the second shielding layer, and the three sensing optical fibers are uniformly distributed between the plurality of second cable units and the second shielding layer.

[0024] The outer circumferential side of each sensing optical fiber has a third insulating layer.

[0025] In a possible implementation, the marine umbilical cable further comprises: at least three ground wires;

[0026] The three ground wires are respectively located in different gaps between the plurality of second cable units and the second shielding layer, and the three ground wires are uniformly distributed between the plurality of second cable units and the second shielding layer.

[0027] The outer circumferential side of each ground wire has a fourth insulating layer.

[0028] In a possible implementation, the marine umbilical cable further comprises: a first outer sheath and a second outer sheath.

[0029] The first outer sheath is located on the outer circumferential side of the second shielding layer.

[0030] The second outer sheath is located on the outermost layer of the entire marine umbilical cable.

[0031] In a possible implementation, the marine umbilical cable further comprises: a reinforcing layer.

[0032] The reinforcing layer is located between the first outer sheath and the second outer sheath.

[0033] The second aspect of the present application provides a device comprising the marine umbilical cable described above.

[0034] The present application provides a marine umbilical cable and a device. The marine umbilical cable comprises 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 the plurality of first cable units have electrically conductive fluid therebetween. The plurality of second cable units are twisted into a cable, the plurality of second cable units have electrically conductive fluid therebetween, and the plurality of second cable units are located on the outer circumferential side of the plurality of first cable units. The first shielding layer completely covers the outer circumferential side of the plurality of first cable units after being twisted into a cable, 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 circumferential side of the plurality of second cable units after being twisted into a cable. The surfaces of the first shielding layer and the second shielding layer both have wrinkles. The device comprises the marine umbilical cable described above. In this way, the present application can separate the design of medium-voltage power transmission and low-voltage power transmission for different voltage hybrid power transmission umbilical cables, and use independent shielding measures for medium-voltage and low-voltage to reduce electromagnetic interference between medium-voltage and low-voltage. In addition, the medium-voltage cable and the low-voltage cable both use shielding layers with wrinkled surfaces for magnetic field shielding, which reduces the bending radius of the umbilical cable, improves the fatigue resistance of the umbilical cable, improves the pressure resistance of the umbilical cable under high water pressure, and reduces the radial contraction of the umbilical cable. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0036] Figure 1 The structural schematic diagram of the marine umbilical cable provided by an embodiment of the present application is shown.

[0037] Explanation of reference signs:

[0038] 100 - marine umbilical cable;

[0039] 200 - first cable unit;

[0040] 210 - control line; 220 - signal line; 230 - first insulation layer; 240 - filler;

[0041] 300 - second cable unit;

[0042] 310 - power line; 320 - semi-conductive shielding layer; 330 - second insulation layer; 340 - insulation shielding layer;

[0043] 400 - first shielding layer;

[0044] 410 - first inner sheath; 420 - second inner sheath;

[0045] 500 - second shielding layer;

[0046] 510 - first outer sheath; 520 - second outer sheath; 530 - reinforcing layer;

[0047] 600 - sensing optical fiber;

[0048] 610 - third insulation layer;

[0049] 700 - ground wire;

[0050] 710 - fourth insulation layer. DETAILED DESCRIPTION

[0051] As described in the background, the commonly used metal armored cable at present stage is generally suitable for underwater equipment with lighter weight or simpler function, and the ocean umbilical cable suitable for large water depth, large power and heavy load has not been applied. The working voltage of the current umbilical cable is generally low, usually not more than 3.3kV, the structure is relatively simple, and the electromagnetic interference is weak. However, when the working voltage of the umbilical cable is increased to medium voltage, and the low-voltage control line is mixed in the cable, the electromagnetic interference between the cores is strong, and better electromagnetic shielding measures are needed. In addition, due to the working characteristics, it is necessary to add optical fibers to monitor the cable stress, temperature and state.

[0052] To solve the above technical problems, the embodiment of the present application provides an ocean umbilical cable and equipment. The ocean umbilical cable comprises 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 the plurality of first cable units have electrically conductive fluid therebetween. The plurality of second cable units are twisted into a cable, the plurality of second cable units have electrically conductive fluid therebetween, and the plurality of second cable units are located on the outer circumferential side of the plurality of first cable units. The first shielding layer completely covers the outer circumferential side after the plurality of first cable units are twisted into a cable, 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 circumferential side after the plurality of second cable units are twisted into a cable. The surfaces of the first shielding layer and the second shielding layer both have wrinkles. The equipment comprises the above ocean umbilical cable. In this way, the present application can adopt medium-voltage transmission and low-voltage transmission structure separation design for umbilical cables with different voltage mixed transmission, and adopt medium-voltage and low-voltage independent shielding measures to reduce electromagnetic interference between medium-voltage and low-voltage. In addition, the medium-voltage cable and the low-voltage cable both adopt shielding layers with wrinkles on the surface for magnetic field shielding, which reduces the bending radius of the umbilical cable, improves the fatigue resistance of the umbilical cable, improves the pressure resistance of the umbilical cable under high water pressure, and reduces the radial contraction of the umbilical cable.

[0053] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0054] The embodiment of the present application provides a kind of marine umbilical cable and equipment, for different voltage mixed power transmission umbilical cable, with medium voltage transmission and low voltage transmission structure separation design, and with medium and low voltage independent shielding measures, reduce the electromagnetic interference between medium and low voltage.In addition, medium voltage cable and low voltage cable are shielded by the shielding layer with wrinkle on surface, reduce the bending radius of umbilical cable, improve the fatigue resistance of umbilical cable, also improve the compression resistance of umbilical cable under high water pressure, and reduce the radial shrinkage of umbilical cable.Combined with the drawings, the specific structure of the marine umbilical cable and equipment provided by the embodiment of the present application is introduced.

[0055] Reference Figure 1 The first aspect of the embodiment of the present application provides a kind of marine umbilical cable 100.Therein, in the embodiment of the present application, the marine umbilical cable 100 can include first cable unit 200, second cable unit 300, first shielding layer 400 and second shielding layer 500.Therein, in a possible implementation mode, the number of first cable unit 200 and second cable unit 300 can be several, and the number of first cable unit 200 and second cable unit 300 is not limited herein.In the embodiment of the present application, first cable unit 200 can be low voltage cable, and second cable unit 300 can be medium voltage cable.Therein, several first cable unit 200 can be twisted into low voltage cable, and several first cable unit 200 can have conductive fluid between them.Correspondingly, several second cable unit 300 can be twisted into high voltage cable, and several second cable unit 300 can also have conductive fluid between them, and several second cable unit 300 can be located on the outer periphery side of several first cable unit 200.In a possible implementation mode, the conductive fluid can be semi-conductive water-resistant glue.The fluid can be filled between several first cable unit 200 and several second cable unit 300.On the one hand, the core structure of marine umbilical cable 100 is round and compact, reducing the radial shrinkage of the whole marine umbilical cable 100 under high water pressure.On the other hand, semi-conductive water-resistant glue can completely wrap the core of first cable unit 200 and second cable unit 300, so as to balance the external electric field of insulation, and completely contact with first shielding layer 400 and second shielding layer 500, improve the anti-interference ability.

[0056] Continue to refer to Figure 1In the implementation of the embodiment, the first shielding layer 400 can completely wrap the outer periphery of the plurality of first cable units 200 after being stranded into a cable, and the first shielding layer 400 can be located between the plurality of first cable units 200 and the plurality of second cable units 300, so as to separate the first cable units 200 and the second cable units 300. Correspondingly, the second shielding layer 500 can completely wrap the outer periphery of the plurality of second cable units 300 after being stranded into a cable. In this way, the first shielding layer 400 and the second shielding layer 500 can enable the plurality of first cable units 200 and the plurality of second cable units 300 to be independently shielded, thereby reducing electromagnetic interference between the first cable units 200 and the second cable units 300.

[0057] On the basis of the above-mentioned embodiment, the surfaces of the first shielding layer 400 and the second shielding layer 500 can each have corrugations. In a possible implementation, the first shielding layer 400 and the second shielding layer 500 can each be a corrugated copper strip. It can be understood that the corrugated copper strip has good bending properties and fatigue resistance. The plurality of corrugations on the surfaces of the first shielding layer 400 and the second shielding layer 500 can avoid the occurrence of easy breakage, reduce the bending radius of the umbilical cable, improve the fatigue resistance of the umbilical cable, improve the compression resistance of the umbilical cable under high water pressure, and reduce the radial contraction of the umbilical cable.

[0058] With reference to the above-mentioned embodiment, Figure 1 On the basis of the above-mentioned embodiment, each first cable unit 200 can include a plurality of control lines 210 and at least one signal line 220. In a possible implementation, the number of control lines 210 can be a plurality, and the number of signal lines 220 can be at least one. The number of signal lines 220 can be one or more, and the present application does not limit the number of control lines 210 and signal lines 220. In the embodiment, the plurality of control lines 210 and the signal line 220 are stranded into a cable to form the cable core of the first cable unit 200, and the signal line 220 can be a communication optical unit, that is, the signal is transmitted through an optical fiber. In this way, the transmission through the optical fiber can ensure that the signal line 220 is not affected by electromagnetic waves. In addition, the outer periphery of the plurality of control lines 210 and the signal line 220 after being stranded into a cable can have a first insulating layer 230. The first insulating layer 230 can protect the control lines 210 and the signal line 220.

[0059] With reference to the above-mentioned embodiment, Figure 1Based on the above embodiments, 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 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.

[0060] Continue to refer to Figure 1 Based on the above embodiments, 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.

[0061] Continue to refer to Figure 1 Based on the above embodiments, 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.

[0062] Continue to refer to Figure 1On the basis of the above-mentioned embodiments, each second cable unit 300 can comprise a power line 310, a semi-conductive shielding layer 320, a second insulation layer 330, and an insulation shielding layer 340. In one possible implementation, the number of power lines 310 can be several, which is not limited in the present application. In the embodiments of the present application, the several power lines 310 are stranded into a cable, and the semi-conductive shielding layer 320 can be wrapped on the outer circumferential side of the stranded cable of the several power lines 310. Accordingly, the second insulation layer 330 can be located on the outer circumferential side of the semi-conductive shielding layer 320, and the insulation shielding layer 340 can be located on the outer circumferential side of the second insulation layer 330. In this way, the several power lines 310, the semi-conductive shielding layer 320, the second insulation layer 330, and the insulation shielding layer 340 can be arranged in sequence from inside to outside, thereby forming the second cable unit 300.

[0063] With reference to the above-mentioned embodiments, Figure 1 On the basis of the above-mentioned embodiments, the several first cable units 200 can be filled and located on the inner circumferential side of the several second cable units 300. In one possible implementation, the several first cable units 200 can be arranged in a circumferential shape, so that the several first cable units 200 can be used to support the several second cable units 300. In this way, from the radial cross-section of the second cable unit 300, the several second cable units 300 can also be arranged in a circumferential shape, which is convenient for the second shielding layer 500 to be wrapped.

[0064] With reference to the above-mentioned embodiments, Figure 1 On the basis of the above-mentioned embodiments, the marine umbilical cable 100 can further comprise a sensing optical fiber 600. In one possible implementation, the number of sensing optical fibers 600 can be at least three, which is not limited in the present application. In the embodiments of the present application, the number of sensing optical fibers 600 is taken as an example of three, the three sensing optical fibers 600 can be respectively located in the gap between the several second cable units 300 and the second shielding layer 500, and the three sensing optical fibers 600 are uniformly distributed between the several second cable units 300 and the second shielding layer 500. In this way, from the radial cross-section of the second cable unit 300, since the several second cable units 300 are arranged in a circumferential shape, the cross-section of the three sensing optical fibers 600 can be arranged in an equilateral triangle shape, which is convenient for the sensing optical fiber 600 to completely cover the entire marine umbilical cable 100, thereby realizing omnidirectional signal transmission. In addition, the outer circumferential side of each sensing optical fiber 600 can have a third insulation layer 610, which can protect the sensing optical fiber 600.

[0065] On the basis of the above-mentioned embodiments, in a possible implementation, each sensing optical fiber 600 can be composed of an optical fiber, a protective layer, aramid fiber, and an outer protective layer. The sensing optical fiber 600 can be wound on the outer layer of the plurality of second cable units 300, and the distributed optical fiber stress testing device can infer the state change of the marine umbilical cable 100 by the phase stress change of the three sensing optical fibers 600.

[0066] With reference to the above-mentioned embodiments, Figure 1 On the basis of the above-mentioned embodiments, the marine umbilical cable 100 can further include a ground wire 700. In a possible implementation, the number of the ground wire 700 can be at least three, and the number of the ground wire 700 is not limited in the present application. In the embodiments of the present application, the number of the ground wire 700 is taken as three for example, and it can be understood that the three ground wires 700 can also be located in different gaps between the plurality of second cable units 300 and the second shielding layer 500, and the three ground wires 700 are uniformly distributed between the plurality of second cable units 300 and the second shielding layer 500. In a possible implementation, the three ground wires 700 and the three sensing optical fibers 600 can be located in different gaps between the plurality of second cable units 300 and the second shielding layer 500, and the three ground wires 700 and the three sensing optical fibers 600 are spaced and uniformly located in different gaps between the plurality of second cable units 300 and the second shielding layer 500. In addition, the outer circumferential side of each ground wire 700 can have a fourth insulating layer 710, and the fourth insulating layer 710 can protect the ground wire 700.

[0067] With reference to the above-mentioned embodiments, Figure 1 On the basis of the above-mentioned embodiments, the plurality of power lines 310, the sensing optical fiber 600, and the ground wire 700 are stranded into a cable, and wound on the outer circumferential side of the first cable unit 200 to form the cable core of the second cable unit 300. In a possible implementation, the semi-conductive shielding layer 320 in the power line 310, the fluid, the ground wire 700, and the second shielding layer 500 can jointly form a shielding structure of the second cable unit 300. The second shielding layer 500 can be a smooth copper strip subjected to an online embossing process, and longitudinally wrapped on the plurality of second cable units 300 to achieve full coverage of the second cable units 300 in a lap joint manner. In addition, in order to improve the pressure resistance of the second shielding layer 500 in deep water, a conductive fluid is coated to fill the gap in the second shielding layer 500 when longitudinally wrapping. In addition, the second shielding layer 500 needs to be grounded at both ends of the second cable unit 300 to zero the induced voltage around the plurality of second cable units 300 to form a medium voltage cable.

[0068] With reference to the above-mentioned embodiments, Figure 1On the basis of the above-mentioned embodiments, the marine umbilical cable 100 can further include a first outer sheath 510 and a second outer sheath 520. The first outer sheath 510 can be located at the outer circumferential side of the second shielding layer 500, and the second outer sheath 520 is located at the outermost layer of the entire marine umbilical cable 100. In a possible implementation, the first outer sheath 510 and the second outer sheath 520 can be made of insulating materials. It can be understood that the first outer sheath 510 can be an extruded plastic layer outside the second shielding layer 500. On the one hand, it can protect the components such as the plurality of second cable units 300, the sensing optical fiber 600, and the ground wire 700, and on the other hand, it can facilitate the water-tight treatment of the marine umbilical cable 100 at the underwater terminal. Correspondingly, the second outer sheath 520 can be an extruded plastic layer located at the outermost layer, and the second outer sheath 520 can further facilitate the water-tight treatment of the marine umbilical cable 100 at the underwater terminal. The first outer sheath 510 and the second outer sheath 520 both have a certain thickness and good pressure resistance, and the extruded surface is mechanically or chemically sealed to prevent seawater from entering the inside of the marine umbilical cable 100.

[0069] With reference to the above-mentioned embodiments, Figure 1 On the basis of the above-mentioned embodiments, the marine umbilical cable 100 can further include a reinforcing layer 530. The reinforcing layer 530 can be located between the first outer sheath 510 and the second outer sheath 520. In a possible implementation, the reinforcing layer 530 can be made of high-strength fibers. For example, aramid fibers, ultra-high molecular weight polyethylene, or the like can be used to prepare the reinforcing layer 530, which can provide sufficient strength for the load-bearing of the marine umbilical cable 100 by means of winding or weaving. It can be understood that the second outer sheath 520 can be located at the outer circumferential side of the reinforcing layer 530, and the second outer sheath 520 can be used to protect the reinforcing layer 530.

[0070] Of course, in some embodiments, the first shielding layer 400 and the second shielding layer 500 can also be made of copper wire weaving. In addition, the electrically conductive fluid can also be made of semi-conductive water-resistant yarn, etc. In a possible implementation, the outer circumferential side of the power line 310 can be provided with an independent shielding layer and a sheath layer, so as to further electromagnetically shield and protect the power line 310.

[0071] The second aspect of the embodiments of the present application provides a device (not shown in the figure), which can include the marine umbilical cable 100 described above. It can be understood that the device can be applied to the fields of deep-sea scientific research, deep-sea mining, hydrate exploitation, deep-sea observation system, etc.

[0072] In the embodiment of the present application, the control lines 210 and the signal lines 220 form the low-voltage cable core of the inner layer, and the low-voltage cable core has the extruded first inner sheath 410 on the outer circumferential side, and the first shielding layer 400 is longitudinally wrapped on the outer circumferential side of the first inner sheath 410. The fluid in the low-voltage cable core, the first inner sheath 410 and the first shielding layer 400 together form the low-voltage cable core shielding structure. In addition, the power lines 310 and the ground wire 700 are wound on the outer layer of the low-voltage cable core, and together with the sensing optical fiber 600 form the medium-voltage cable core of the outer layer, and the medium-voltage cable core has the second shielding layer 500 longitudinally wrapped on the outer circumferential side. The fluid in the medium-voltage cable core, the semiconductive shielding layer 320 in the power line 310, the ground wire 700 and the second shielding layer 500 together form 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 in the form of 100% full wrapping, avoiding electromagnetic interference between the low-voltage and the medium-voltage, and both types of shielding structures are grounded at both ends of the marine umbilical cable 100.

[0073] In the embodiment of the present application, the first shielding layer 400 and the second shielding layer 500 not only have the function of electromagnetic shielding, but also have good bending performance, which increases the fatigue resistance of the marine umbilical cable 100. In deep water environment, it can play a certain pressure resistance role, reducing the radial contraction of the cable under high water pressure. In addition, the present application adopts uniformly distributed sensing optical fibers 600, which are wound on the outer circumferential side of the medium-voltage cable core, which improves the tensile and bending properties of the entire marine umbilical cable 100, and in combination with the stress testing device, the phase stress change can be used to infer the state change of the marine umbilical cable 100. The semiconductive water-blocking glue is used to fill the gap between the first cable unit 200 and the second cable unit 300, and the gap between the first shielding layer 400 and the second shielding layer 500, on the one hand, the structure of the low-voltage cable core and the medium-voltage cable core is round and compact, on the other hand, the semiconductive water-blocking glue can be completely wrapped around the cable core, balance the external electric field of the insulation, and completely contact with the first shielding layer 400 and the second shielding layer 500, and improve the anti-interference ability.

[0074] Each embodiment or implementation in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between each embodiment can be referred to each other.

[0075] It should be noted that the terms "in a specific implementation", "in some embodiments", "in the present embodiment", "exemplarily" and the like in the specification mean that the embodiments described may include a specific feature, structure or property, but not necessarily every embodiment includes the specific feature, structure or property. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or property is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or property in combination with other embodiments that are explicitly or implicitly described.

[0076] In general, terminology can be understood at least in part from an ordinary sense of the corresponding terminology as would be understood by those of ordinary skill regardless of a meaning of the corresponding terminology in suit. For example, and as would be understood by those of ordinary skill, the terms "a" or "an" can mean one or more than one, and the term "the" can mean one or more than one, depending at least in part on context. As used herein, the term "exemplary" can mean serving as a non-limiting example, instance, or illustration. As used herein, the term "or" can mean and / or. As used herein, the term "and / or" can mean and / or. As used herein, the phrase at least based on criteria, measurements, or work can include based on the criteria, measurements, or work, or based on no criteria, measurements, or work, or based on a combination of criteria, measurements, or work and no criteria, measurements, or work.

[0077] It will be readily understood that the terms "on", "above", and "over", when used in this disclosure, should be interpreted to include not only the meanings of "directly on", but also the meaning of "on" with intervening features or layers therebetween, and that "above" or "over" should be interpreted to include not only the meaning of "above" or "over", but also the meaning of "above" or "over" with no intervening features or layers therebetween (i.e., directly on).

[0078] In addition, spatially relative terms, such as "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0079] Finally, it should be noted that the above-described embodiments are merely exemplary of the application of the present application and should not be used in a manner to limit the present application; not even if it is described in one of the above embodiments. Those of ordinary skill in the art will understand that, based on the foregoing description of the embodiments described above, they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to some or all of the technical features therein; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A marine umbilical cable, characterized by The marine umbilical cable comprises: a plurality of first cable units, the plurality of first cable units being twisted to form a first cable, and the plurality of first cable units being filled with electrically conductive fluid; a plurality of second cable units, the plurality of second cable units being twisted to form a second cable, the plurality of second cable units being filled with electrically conductive fluid, and the plurality of second cable units being located at the outer circumferential side of the plurality of first cable units; a first shielding layer, the first shielding layer completely covering the outer circumferential side of the first cable, and the first shielding layer being located between the plurality of first cable units and the plurality of second cable units; the first shielding layer being grounded at both ends of the first cable unit and zeroing the induced voltage acting on the periphery of the first cable; a second shielding layer, the second shielding layer completely covering the outer circumferential side of the second cable; the second shielding layer being grounded at both ends of the second cable unit and zeroing the induced voltage acting on the periphery of the second cable; a sensing optical fiber, the sensing optical fiber being located in the gap between the plurality of second cable units and the second shielding layer; a ground wire, the ground wire and the sensing optical fiber being located in different gaps between the plurality of second cable units and the second shielding layer, respectively; the voltage of the first cable being less than the voltage of the second cable; the surfaces of the first shielding layer and the second shielding layer both having wrinkles; the inner circumferential side of the plurality of first cable units having a filler, the filler being used to support the plurality of first cable units.

2. The marine umbilical cable according to claim 1, characterized in that Each of the first cable units comprises a plurality of control lines and at least one signal line; the plurality of control lines and the signal line being twisted into a cable, and the outer circumferential side of the plurality of control lines and the signal line after being twisted into a cable having a first insulating layer.

3. The marine umbilical cable according to claim 2, characterized in that, a first inner sheath being located between the plurality of first cable units and the first shielding layer; the outer circumferential side of the first shielding layer having a second inner sheath.

4. The marine umbilical cable according to claim 3, characterized in that, Each of the second cable units comprises a plurality of power lines, a semi-conductive shielding layer, a second insulating layer, and an insulating shielding layer; the plurality of power lines being twisted into a cable, and the semi-conductive shielding layer covering the outer circumferential side of the plurality of power lines after being twisted into a cable; the second insulating layer being located at the outer circumferential side of the semi-conductive shielding layer, and the insulating shielding layer being located at the outer circumferential side of the second insulating layer.

5. The marine umbilical cable according to claim 4, characterized in that The marine umbilical cable comprises at least three sensing optical fibers; the three sensing optical fibers being located in the gaps between the plurality of second cable units and the second shielding layer, respectively, and the three sensing optical fibers being uniformly distributed between the plurality of second cable units and the second shielding layer; the outer circumferential side of each of the sensing optical fibers having a third insulating layer.

6. The marine umbilical cable according to claim 5, characterized in that The marine umbilical cable comprises at least three ground wires; the three ground wires and the three sensing optical fibers being located in different gaps between the plurality of second cable units and the second shielding layer, respectively, and the three ground wires being uniformly distributed between the plurality of second cable units and the second shielding layer; the outer circumferential side of each of the ground wires having a fourth insulating layer.

7. The marine umbilical cable according to claim 6, 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 an outer circumferential side of the second shielding layer. The second outer sheath is located on an outermost layer of the entire marine umbilical cable.

8. The marine umbilical cable according to claim 7, characterized in that The marine umbilical cable further includes a reinforcing layer. The reinforcing layer is located between the first outer sheath and the second outer sheath.

9. An apparatus, comprising: A marine umbilical cable comprising the marine umbilical cable of any one of claims 1 to 8.

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