阅读说明：本技术 深水海底电缆 (Deep water submarine cable ) 是由 张洪亮 胡明 于洪淼 严彦 闫志雨 赵囿林 王丽媛 顾春飞 张小龙 花炜 于 2021-07-23 设计创作，主要内容包括：本申请提供一种深水海底电缆。本申请提供的深水海底电缆包括缆芯、缓冲支撑件、光纤单元和保护单元；缆芯数量为至少三个；缓冲支撑件设置在多个缆芯之间,且缓冲支撑件的硬度小于缆芯的外周壁的硬度；缓冲支撑件的边缘处具有间隔分布的支撑部和缺口,支撑部具有容纳光纤单元的容纳空间,缆芯的至少部分位于缺口内；保护单元包覆缆芯、缓冲支撑件和光纤单元,且保护单元的内周壁与每个缆芯的外周壁贴合。本申请的深水海底电缆具有较高的电气性能,且不易被击穿。(The application provides a deep water submarine cable. The deepwater submarine cable comprises a cable core, a buffer supporting piece, an optical fiber unit and a protection unit; the number of the cable cores is at least three; the buffer support member is arranged among the cable cores, and the hardness of the buffer support member is less than that of the peripheral wall of each cable core; the edge of the buffer support part is provided with support parts and notches which are distributed at intervals, the support parts are provided with accommodating spaces for accommodating the optical fiber units, and at least part of the cable core is positioned in the notches; the protection unit coats the cable cores, the buffer support piece and the optical fiber unit, and the inner peripheral wall of the protection unit is attached to the outer peripheral wall of each cable core. The deep water submarine cable has high electrical performance and is not easy to break down.)

1. A deepwater submarine cable is characterized by comprising a cable core, a buffer support piece, an optical fiber unit and a protection unit; the number of the cable cores is at least three;

the buffer support piece is arranged among the cable cores, and the hardness of the buffer support piece is smaller than that of the peripheral wall of each cable core; the edge of the buffer support is provided with support parts and notches which are distributed at intervals, the support parts are provided with accommodating spaces for accommodating the optical fiber units, and at least part of the cable core is positioned in the notches;

the protection unit cladding cable core, buffering support piece with the optic fibre unit, just the internal perisporium of protection unit with every the periphery wall laminating of cable core.

2. The deep water submarine cable according to claim 1, wherein the buffer support comprises a first buffer portion and a plurality of second buffer portions, the first buffer portion being located at a central position of the cable, and an axis of the first buffer portion coinciding with an axis of the cable;

the plurality of second buffer parts are uniformly distributed at intervals in the circumferential direction of the first buffer part, the extending direction of the second buffer parts is consistent with the radial direction of the first buffer part, the notch is formed between two adjacent second buffer parts, and the notch is abutted against the outer peripheral wall of the corresponding cable core;

the extending end of at least one second buffer part is provided with the supporting part, the supporting part is provided with a supporting hole with the axial direction consistent with the axial direction of the cable, the inner cavity of the supporting hole forms the accommodating space, and the optical fiber unit is positioned in the supporting hole.

3. The deep water submarine cable according to claim 2, wherein the second buffer portion is a buffer arm, and widths of both ends of the buffer arm are respectively smaller than a width of a middle portion of the buffer arm;

the buffer arm comprises a first buffer section and a second buffer section which are sequentially connected in the radial direction of the first buffer part, and the first buffer section is positioned on one side, close to the first buffer part, of the second buffer section.

4. The deep water submarine cable according to claim 3, wherein the first buffer section has a plurality of cavities spaced apart in the circumferential direction of the first buffer.

5. The deep water submarine cable according to any one of claims 2 to 4, wherein the optical fiber units and the support parts are the same in number and are arranged correspondingly;

the plurality of support portions are disposed on the same second buffer portion, or the plurality of support portions are disposed on different second buffer portions, respectively.

6. The deep water submarine cable according to claim 5, wherein when a plurality of the support portions are provided on different second buffer portions, the second buffer portions correspond to the support portions one to one.

7. The deep water submarine cable according to claim 6, wherein at least three of the cable cores include a plurality of first cable cores, the plurality of first cable cores are uniformly spaced apart in the circumferential direction of the cable, and two adjacent second buffer portions collectively sandwich one of the first cable cores so that the outer circumferential wall of the first cable core abuts against the corresponding notch.

8. A deepwater submarine cable according to claim 6 or 7, wherein the first buffer is provided with a through-hole, the axis of which coincides with the axis of the cable.

9. The deep water submarine cable according to claim 8, wherein the plurality of cable cores further comprises a second cable core, the second cable core being disposed within the through-hole, and an axis of the second cable core being coincident with an axis of the through-hole.

10. The deep water submarine cable according to claim 9, wherein the protective elements comprise armour comprising at least one layer of armour elements comprising a plurality of metal strips arranged in close circumferential proximity along the cable.

11. The deep water submarine cable according to claim 10, wherein the metal strips have a recess and a projection that are connected in series in a radial direction of the cable, and a recess direction of the recess and a projection direction of the projection both coincide with a circumferential direction of the cable, and in the armor unit, the projection of one of the two adjacent metal strips snaps into the recess of the other.

12. The deep water submarine cable according to claim 11, wherein the concave portion is a concave arc section and the convex portion is a convex arc section.

13. The deep water submarine cable according to claim 10, wherein when the armor comprises a plurality of armor units, the armor units are sequentially sleeved in the radial direction of the cable, and the metal strips in two adjacent armor units are staggered in the radial direction of the cable.

14. The deep water submarine cable according to claim 13, wherein the surfaces of the metal strips facing the inside of the cable and the surfaces facing the outside of the cable extend in the circumferential direction of the cable at different lengths.

Technical Field

The application relates to the technical field of electric wires and cables, in particular to a deepwater submarine cable.

Background

Submarine cables are wires wrapped with insulating materials and laid under the sea floor and river water for telecommunication transmission. The submarine cables are divided into two types, namely submarine communication cables and submarine power cables, the submarine communication cables are mainly used for communication services, and the submarine power cables are mainly used for transmitting high-power electric energy underwater.

Most of existing submarine cables comprise one or more cable cores, optical fiber units, filling units and protection units, wherein the extending directions of the optical fiber units, the filling units and the protection units are consistent with the extending direction of the cable cores, the cable cores and the optical fiber units are located in the protection units, the filling units are filled between the cable cores and the optical fiber units, the cable cores are power units, the protection units comprise armor layers, outer protection layers and the like, and the armor layers are formed by twisting a plurality of metal strips extending along one direction; in the process that the submarine cable is laid underwater, under the action of the gravity of the submarine cable and the buoyancy of seawater on the submarine cable, the bottom end of the armor layer is under the action of a downward pulling force, metal strips in the armor layer are tightened to the inside, and a cable core, a filling unit and an optical fiber unit which are positioned inside are extruded.

Therefore, in the process of laying the submarine cable, the bottom end of the armor layer is stressed increasingly, so that the extrusion force applied to the cable core and the like inside the armor layer is increased, and after the submarine cable is laid, the electrical performance of the submarine cable is reduced, and even the submarine cable is punctured.

Disclosure of Invention

The application provides a deep water submarine cable, has higher electric property, and can avoid taking place to puncture.

The application provides a deepwater submarine cable, which comprises a cable core, a buffer support piece, an optical fiber unit and a protection unit; the number of the cable cores is at least three; the buffer support member is arranged among the cable cores, and the hardness of the buffer support member is less than that of the peripheral wall of each cable core; the edge of the buffer support part is provided with support parts and notches which are distributed at intervals, the support parts are provided with accommodating spaces for accommodating the optical fiber units, and at least part of the cable core is positioned in the notches; the protection unit coats the cable cores, the buffer support piece and the optical fiber unit, and the inner peripheral wall of the protection unit is attached to the outer peripheral wall of each cable core.

Optionally, in the deep water submarine cable provided by the present application, the buffer support comprises a first buffer part and a plurality of second buffer parts, the first buffer part is located at a central position of the cable, and an axis of the first buffer part coincides with an axis of the cable; the plurality of second buffer parts are uniformly distributed at intervals in the circumferential direction of the first buffer part, the extending direction of the second buffer parts is consistent with the radial direction of the first buffer part, the gap is formed between every two adjacent second buffer parts, and the gap is abutted against the outer circumferential wall of the corresponding cable core; the extending end of the at least one second buffer part is provided with a supporting part, the supporting part is provided with a supporting hole, the axial direction of the supporting hole is consistent with the axial direction of the cable, an inner cavity of the supporting hole forms an accommodating space, and the optical fiber unit is positioned in the supporting hole.

Optionally, in the deep-water submarine cable provided by the present application, the second buffer portion is a buffer arm, and widths of both ends of the buffer arm are respectively smaller than a width of a middle portion of the buffer arm; the buffer arm comprises a first buffer section and a second buffer section which are sequentially connected in the radial direction of the first buffer part, and the first buffer section is positioned on one side, close to the first buffer part, of the second buffer section.

Optionally, in the deep water submarine cable provided by the present application, the first buffer section has a plurality of cavities distributed at intervals in a circumferential direction of the first buffer portion.

Optionally, in the deep-water submarine cable provided by the present application, the number of the optical fiber units and the number of the supporting portions are the same and the optical fiber units and the supporting portions are correspondingly arranged; the plurality of supporting parts are arranged on the same second buffer part, or the plurality of supporting parts are respectively arranged on different second buffer parts.

Optionally, in the deep water submarine cable provided by the present application, when the plurality of support parts are disposed on different second buffer parts, the second buffer parts correspond to the support parts one to one.

Optionally, in the deep water submarine cable provided by the application, the at least three cable cores include a plurality of first cable cores, the plurality of first cable cores are uniformly distributed at intervals in the circumferential direction of the cable, and two adjacent second buffer portions clamp one first cable core together, so that the outer circumferential wall of each first cable core abuts against the corresponding notch.

Optionally, in the deep-water submarine cable provided by the present application, the first buffer portion is provided with a through hole, and an axis of the through hole coincides with an axis of the cable.

Optionally, in the deep-water submarine cable provided by the present application, the plurality of cable cores further includes a second cable core, the second cable core is disposed in the through hole, and an axis of the second cable core coincides with an axis of the through hole.

Optionally, in the deep-water submarine cable provided by the present application, the protection unit includes an armor layer, and the armor layer includes at least one layer of armor layer unit, and the armor layer unit includes a plurality of metal strips arranged next to each other along the circumferential direction of the cable.

Optionally, in the deep-water submarine cable provided by the present application, the metal strips have a concave portion and a convex portion connected in sequence in a radial direction of the cable, both a concave direction of the concave portion and a convex direction of the convex portion are in accordance with a circumferential direction of the cable, and in the armor layer unit, the convex portion of one of two adjacent metal strips is snapped into the concave portion of the other metal strip.

Optionally, in the deep water submarine cable provided by the present application, the concave portion is a concave arc section, and the convex portion is a convex arc section.

Optionally, in the deep-water submarine cable provided by the application, when the armor layer includes multiple armor layer units, the multiple armor layer units are sequentially sleeved in the radial direction of the cable, and the metal strips in two adjacent armor layer units are distributed in a staggered manner in the radial direction of the cable.

Optionally, in the deep water submarine cable provided by the present application, the surface of the metal strip facing the inside of the cable and the surface facing the outside of the cable have different extending lengths in the circumferential direction of the cable.

The deepwater submarine cable comprises a cable core, a buffer supporting piece, an optical fiber unit and a protection unit; the number of the cable cores is at least three; the buffer support member is arranged among the cable cores, and the hardness of the buffer support member is less than that of the peripheral wall of each cable core; the edge of the buffer support part is provided with support parts and notches which are distributed at intervals, the support parts are provided with accommodating spaces for accommodating the optical fiber units, and at least part of the cable core is positioned in the notches; the protection unit coats the cable cores, the buffer support piece and the optical fiber unit, and the inner peripheral wall of the protection unit is attached to the outer peripheral wall of each cable core. The deep water submarine cable provided by the application has higher electrical performance and is not easy to break down.

The construction of the present application and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1a is a schematic view of a first structure of a deep-water submarine cable according to an embodiment of the present application;

fig. 1b is a schematic view of a second structure of a deep-water submarine cable according to an embodiment of the present application;

fig. 1c is a schematic view of a third structure of a deep-water submarine cable according to an embodiment of the present application;

fig. 1d is a schematic view of a fourth structure of a deep-water submarine cable according to an embodiment of the present application;

fig. 1e is a schematic view of a fifth structure of a deep-water submarine cable according to an embodiment of the present application;

fig. 2 is a schematic diagram illustrating a positional relationship among a buffer support, an optical fiber unit and a cable core in the deep-water submarine cable according to the embodiment of the present application;

fig. 3 is a schematic structural diagram of a buffer support in a deep-water submarine cable according to an embodiment of the present application;

fig. 4 is a positional relationship between cable cores when the number of cable cores in the deep-water submarine cable provided by the embodiment of the present application is more than three;

fig. 5 is a schematic structural diagram of an optical fiber unit in a deep-water submarine cable according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a filling unit in a deep-water submarine cable according to an embodiment of the present application.

Description of reference numerals:

1-a cable core; 1 a-a first cable core; 1 b-a second cable core; 11-a water-blocking conductor; 12-a conductor shield layer; 13-an insulating layer; 14-an insulating shield layer; 15-semi-conductive water-blocking layer; 16-a metallic shielding layer; 17-a non-metallic layer; 2-a buffer support; 21-a support part; 211-support holes; 22-a notch; 23-a first buffer; 231-a through hole; 24-a second buffer; 241-a first buffer section; 2411-a cavity; 242-a second buffer segment; 3-an optical fiber unit; 31-an optical fiber; 32-an inner liner layer; 33-stainless steel coiled tubing; 34-weaving a reinforcing layer; 4-a protection unit; 41-wrapping a covering; 42-a layer of armor mat; 43-an armor layer; 431-an armor unit; 4311-metal strip; 44-armor strapping; 5-a filling unit; 51-a first arc segment; 52-second arc segment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that, in the description of the present application, the terms "first" and "second" are used merely for convenience in describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Submarine cables are wires wrapped with insulating materials and laid under the sea floor and river water for telecommunication transmission. The submarine cables are divided into two types, namely submarine communication cables and submarine power cables, the submarine communication cables are mainly used for communication services, and the submarine power cables are mainly used for transmitting high-power electric energy underwater.

Most of existing submarine cables comprise one or more cable cores, optical fiber units, filling units and protection units, wherein the extending directions of the optical fiber units, the filling units and the protection units are consistent with the extending direction of the cable cores, the cable cores and the optical fiber units are located in the protection units, the filling units are filled between the cable cores and the optical fiber units, the cable cores are power units, the protection units comprise armor layers, outer protection layers and the like, and the armor layers are formed by twisting a plurality of metal strips extending along one direction; in the process that the submarine cable is laid underwater, under the action of gravity of the submarine cable, the armor layer can be under the action of downward tension, wherein the armor layer at the position of the water surface is under the maximum action of the tension, correspondingly, metal strips forming the armor layer can be tightened towards the inside, and a cable core, a filling unit and an optical fiber unit which are positioned inside can be extruded; further, when the existing submarine cable includes a plurality of cores, the plurality of cores are arranged next to each other in point contact, and the contact area is small.

Therefore, in the process of laying the submarine cable, the stress of the armor layer is increased along with the increase of the water depth, so that the extrusion force applied to the cable cores and the like inside the armor layer is increased; in the submarine cable including a plurality of cable cores, when the external inward pressing force is too large, the contact points between the cable cores may be deformed, and further the internal insulation structure is deformed and damaged, so that the electrical performance of the cable cores of the submarine cable is reduced, and even the cable cores may be punctured.

Therefore, the embodiment of the application provides the deepwater submarine cable, and the buffer supporting pieces are arranged among the cable cores to buffer the extrusion force received by the cable cores; and through improving the metal strip structure in the armor layer to make the metal strip be difficult to remove to the central point of cable when receiving the extrusion force, thereby ensure that the cable is difficult to take place to puncture, and can guarantee that the electrical property of cable does not take place to damage and descend because of the cable core is extruded.

Fig. 1a is a schematic view of a first structure of a deep-water submarine cable according to an embodiment of the present invention. Fig. 1b is a schematic view of a second structure of a deep-water submarine cable according to an embodiment of the present invention. Fig. 1c is a schematic view of a third structure of a deep-water submarine cable according to an embodiment of the present invention. Fig. 1d is a schematic view of a fourth structure of the deep-water submarine cable according to the embodiment of the present application. Fig. 1e is a schematic structural diagram of a fifth deep-water submarine cable according to an embodiment of the present application.

As shown in fig. 1a to 1e, an embodiment of the present application provides a deep-water submarine cable including a cable core 1, a buffer support 2, an optical fiber unit 3, and a protection unit 4; the cable cores 1 are electric units, and the number of the cable cores 1 is at least three; the buffer support member 2 is arranged among the plurality of cable cores 1, and the hardness of the buffer support member 2 is less than that of the peripheral wall of the cable cores 1; the edge of the buffer support 2 is provided with a support part 21 and a gap 22 which are distributed at intervals, the support part 21 is provided with a containing space for containing the optical fiber unit 3, and at least part of the cable core 1 is positioned in the gap 22; the protection unit 4 covers the cable cores 1, the buffer support 2 and the optical fiber unit 3, and the inner peripheral wall of the protection unit 4 is attached to the outer peripheral wall of each cable core 1. The deep-water submarine cable provided by the embodiment of the application comprises the buffer support parts 2 arranged among the cable cores 1, so that in the process of laying the deep-water submarine cable underwater, when the cable cores 1 receive extrusion force due to the self-gravity of the deep-water submarine cable, the buffer support parts 2 can buffer the extrusion force received by the cable cores 1, the cable cores 1 are prevented from being excessively extruded, and the electric performance of the cable cores 1 can be prevented from being reduced or broken down due to extrusion deformation.

In a specific embodiment of this embodiment, there are 3 cable cores 1, and the included angle between adjacent cable cores 1 is 120 °.

Fig. 2 is a schematic diagram of a positional relationship among a buffer support, an optical fiber unit and a cable core in the deep-water submarine cable according to the embodiment of the present application.

As shown in fig. 2, and in some alternative embodiments, cable core 1 includes water-blocking conductor 11, conductor shield 12, insulating layer 13, insulating shield 14, semiconductive water-blocking layer 15, metallic shield 16, and non-metallic layer 17; the water blocking conductor 11 is positioned at the center of the cable core 1, and the conductor shielding layer 12, the insulating layer 13, the insulating shielding layer 14, the semi-conductive water blocking layer 15, the metal shielding layer 16 and the non-metal layer 17 are sequentially sleeved outside the water blocking conductor 11, wherein the conductor shielding layer 12 is used for improving the electric field distribution on the surface of a lead and eliminating a gap between the lead and the insulating layer 13 so as to improve the overall electrical performance of the cable; the function of the insulating shielding layer 14 is to rapidly transfer out the induced charges generated on the surface of the insulating layer 13.

In some specific embodiments, the water-blocking conductor 11 is a compressed round conductor, the water-blocking conductor 11 may be formed by layering and twisting a plurality of round copper wires, and a seawater-proof water-blocking material is filled between each layer of copper wires; the water blocking conductor 11 may also be formed by layering and twisting a plurality of aluminum wires, specifically, the shape of the monofilament forming the water blocking conductor 11 is trapezoidal or circular, and the resistance of the monofilament forming the water blocking conductor 11 meets the GB/T3953 standard.

It should be noted that, in some optional embodiments, the conductor shielding layer 12, the insulating layer 13 and the insulating shielding layer 14 adopt a three-layer co-extrusion type, and are extruded at one time, and external impurities can be prevented from being introduced among the conductor shielding layer 12, the insulating layer 13 and the insulating shielding layer 14 through the three-layer co-extrusion type, so that the roundness and the interface smoothness of the cable core 1 are improved; meanwhile, the conductor shielding layer 12, the insulating layer 13 and the insulating shielding layer 14 can be tightly combined together, so that the initial free discharge voltage can be improved, the electric field distribution can be improved, the voltage withstanding level of the cable can be improved, and the service life of the cable can be prolonged.

In some optional embodiments, the semiconductive water-blocking layer 15 is formed by lapping and wrapping one or more layers of semiconductive water-blocking tapes, and the material of the semiconductive water-blocking layer 15 is a seawater-proof semiconductive water-blocking tape with high water absorption rate and high expansion rate; the metal shielding layer 16 can be an extruded alloy lead sleeve structure, and can also be a structure formed by twisting a plurality of metal wires and/or covering and lapping a metal belt; the nonmetal layer 17 is formed on the outer periphery of the metal shielding layer 16 by extrusion, and the nonmetal layer 17 is made of an insulating material or a semiconductive polyethylene material, and the material of the nonmetal layer 17 is not particularly limited.

In a specific embodiment of the present embodiment, the buffering supporting member 2 is made of a silicone material with a shore hardness of less than 50 HA. The shore hardness is a reading of a value measured by a shore hardness meter.

Fig. 3 is a schematic structural diagram of a buffer support in a deep water submarine cable according to an embodiment of the present application.

As shown in fig. 3, in the deep water submarine cable provided by the embodiment of the present application, the buffer support 2 includes a first buffer portion 23 and a plurality of second buffer portions 24, the first buffer portion 23 is located at a central position of the cable, and an axis of the first buffer portion 23 coincides with an axis of the cable; the plurality of second buffer portions 24 are evenly distributed at intervals in the circumferential direction of the first buffer portion 23, the extending direction of the second buffer portions 24 is the same as the radial direction of the first buffer portion 23, the notch 22 is formed between two adjacent second buffer portions 24, and the notch 22 abuts against the outer circumferential wall of the corresponding cable core 1.

In order to mount and limit the optical fiber unit 3, in the embodiment of the present application, a support portion 21 is disposed at an extending end of at least one second buffer portion 24, the support portion 21 has a support hole 211 whose axial direction is the same as the axial direction of the cable, an inner cavity of the support hole 211 forms an accommodating space, and the optical fiber unit 3 is located in the support hole 211. Thus, the optical fiber unit 3 can be radially restrained, and the optical fiber unit 3 is prevented from being displaced and deformed when being subjected to a radial pressing force.

In some specific embodiments, the optical fiber units 3 and the supporting portions 21 are the same in number and are arranged correspondingly; a plurality of support portions 21 may be provided on the same second cushioning portion 24; the plurality of support portions 21 may be provided on different second buffer portions 24. For example, the same second buffer portion 24 may be provided with at least one support portion 21 without the support portion 21.

In order to facilitate the manufacturing of the cushion support 2, in some alternative embodiments, when a plurality of support portions 21 are disposed on different second cushion portions 24, the second cushion portions 24 correspond to the support portions 21 one by one. In this way, the process steps of the cushion support 2 can be simplified.

In a specific implementation manner of this embodiment, there are three second buffer portions 24, an included angle between adjacent second buffer portions 24 is 120 °, there are three optical fiber units 3, there are three support portions 21, and the support portions 21 and the second buffer portions 24 are arranged in a one-to-one correspondence; the second buffer part 24 is a buffer arm, and the width of the two ends of the buffer arm is respectively smaller than the width of the middle part of the buffer arm; the buffer arm includes a first buffer segment 241 and a second buffer segment 242 sequentially connected in a radial direction of the first buffer portion 23, and the first buffer segment 241 is located on a side of the second buffer segment 242 close to the first buffer portion 23.

In order to increase the deformation of the buffer support 2 to have high buffer performance, in some alternative embodiments, the first buffer section 241 has a plurality of cavities 2411 distributed at intervals in the circumferential direction of the first buffer portion 23. Thus, due to the existence of the cavity 2411, when the cable core 1 is subjected to extrusion force, the buffer support member 2 can be greatly deformed to buffer the extrusion force with more force.

In a specific embodiment of the present embodiment, the first buffer segment 241 has two cavities 2411 distributed at intervals in the circumferential direction of the first buffer portion 23, and it should be noted that the cavities 2411 here may be inner cavities of groove bodies or inner cavities of holes, and here, the number and specific form of the cavities 2411 are not particularly limited.

In order to further improve the buffering performance of the buffering support 2, in the specific embodiment of the present embodiment, a through hole 231 is provided on the first buffering part 23, and the axis of the through hole 231 coincides with the axis of the cable. Like this, when cable core 1 received the extrusion force, buffer support piece 2 can further cushion more extrusion forces, prevents that cable core 1 from taking place excessive deformation.

Fig. 4 is a positional relationship between cable cores when the number of cable cores in the deep-water submarine cable provided by the embodiment of the present application is greater than three.

As shown in fig. 4, in some other embodiments, when the number of the cable cores 1 is greater than 3, the plurality of cable cores 1 may include a plurality of first cable cores 1a and a plurality of second cable cores 1b, the plurality of first cable cores 1a are uniformly distributed at intervals in the circumferential direction of the cable, and two adjacent second buffer portions 24 collectively sandwich one first cable core 1a so that the peripheral wall of the first cable core 1a abuts in the corresponding notch 22, the second cable core 1b is disposed in the through hole 231, and the axis of the second cable core 1b coincides with the axis of the through hole 231. It should be noted that, in the process of implementing the present application, the number and size of the cable cores 1 may be determined according to actual requirements, and here, the number and size of the cable cores 1 are not specifically limited.

Fig. 5 is a schematic structural diagram of an optical fiber unit in a deep-water submarine cable according to an embodiment of the present application.

As shown in fig. 5, in some alternative embodiments, the optical fiber unit 3 includes a plurality of optical fibers 31, and an inner liner 32, a stainless steel spiral hose 33 and a braided reinforcing layer 34 sequentially wrapped outside the plurality of optical fibers 31; wherein, the lining layer 32 is formed by extruding nylon or fluorinated ethylene propylene to improve the temperature-resistant grade of the cable; the stainless steel spiral hose 33 plays roles of pressure resistance, bending resistance and torsion resistance, and the extrusion force greatly affects the attenuation of the cable, so that the stainless steel spiral hose 33 can improve the extrusion resistance of the cable and is arranged in a spiral shape to improve the bending resistance of the cable; the braided reinforcing layer 34 is formed by combining a stainless steel wire and a fiber braided reinforcing layer, the fiber braided reinforcing layer is formed by poly-p-phenylene benzobisoxazole fibers, and the braided reinforcing layer has the performances of high strength and high temperature resistance, and can prolong the service life of the whole cable.

As shown in fig. 1a to 1e, in some alternative embodiments, the protection unit 4 includes a wrapping layer 41, an armor cushion layer 42, an armor layer 43 and an armor tying layer 44, which are sequentially sleeved from inside to outside, wherein a tying material of the wrapping layer 41 is a high-strength rubberized fabric tape; the armor cushion layer 42 can be an insect-proof copper tape layer, and is formed on the periphery of the wrapping layer 41 in a wrapping mode through a copper tape; the armor layer 43 comprises at least one armor layer unit 431, when the armor layer units 431 are multiple layers, the multiple layers of armor layer units 431 are sequentially sleeved in the radial direction of the cable, the armor layer units 431 comprise a plurality of metal strips 4311 which are closely arranged along the circumferential direction of the cable, and the periphery of the armor layer 43 is coated with an anticorrosive asphalt material; the armor strapping layer 44 is two layers of polypropylene ropes wound around the periphery of the armor layer 43, and the twisting directions of the two layers of polypropylene ropes are opposite; the armored cushion layer 42 is set to be an insect-proof copper tape layer, so that the effects of mouse prevention, termite prevention and marine organism erosion prevention can be achieved, the operation capacity of the deep-water submarine cable in a complex marine environment is improved, and the service life of the deep-water submarine cable is prolonged.

In some embodiments, the binding material of the wrapping layer 41 may also be high-strength polytetramethylene terephthalate (pbt) tape, polyester fiber tape, non-woven fabric, cotton tape, or other suitable material; armor 43 can be twisted by many low carbon galvanized steel wires and form, and armor 43 also can be mixed the transposition by galvanized steel wire and copper wire and form. Here, the binding material of the wraparound 41 and the specific material of the armor 43 are not limited.

As shown in fig. 1a, when the sea water is shallow, the height of the corresponding deep-water submarine cable is small, and therefore, the pressing force generated by the gravity of the cable on the middle portion of the cable is small, and at this time, the pattern of the metal strip 4311 along the radial cross section of the cable may be circular, and since the pressing force is small, the metal strip 4311 is difficult to be displaced in the radial direction of the cable.

When the seawater is deep, the length of the corresponding deep-water submarine cable in the water is large, so that the extrusion force generated by the gravity of the cable on the middle part of the cable is large, and at this time, in order to prevent the metal strip 4311 from shifting in the radial direction of the cable, the metal strip 4311 with a circular cross-section pattern should be improved, specifically, the metal strip 4311 can enable the part of the metal strip 4311 close to the center of the cable in the radial direction of the cable to have a certain blocking effect on the part far away from the center of the cable, so that the shifting in the radial direction of the cable of the metal strip 4311 can be avoided, and the twisting angle of the metal strip 4311 is maintained, so that the middle part of the cable is subjected to a small extrusion force.

As shown in fig. 1b to 1d, in some embodiments, the metal strips 4311 have a concave portion 43111 and a convex portion 43112 connected in this order in the radial direction of the cable, the concave direction of the concave portion 43111 and the convex direction of the convex portion 43112 both coincide with the circumferential direction of the cable, and in the armor layer unit, the convex portion 43112 of one of the two adjacent metal strips 4311 is snapped into the concave portion 43111 of the other. Thus, when the middle portion of the cable is subjected to a pressing force, even if the metal strip 4311 is urged to move to a position close to the center of the cable, at this time, the protruding portion 43112 or the recessed portion 43111 of one of the two adjacent metal strips 4311 can also block the recessed portion 43111 or the protruding portion 43112 of the other metal strip 4311, so that the metal strip 4311 can be prevented from moving in the radial direction of the cable, and the inside of the cable can be prevented from being greatly pressed.

As shown in fig. 1b and 1c, in some alternative embodiments, the concave portion 43111 is a concave arc segment, and the convex portion 43112 is a convex arc segment, so that the cross-sectional pattern of the metal strip 4311 in the radial direction of the cable is close to "S" shape, and the radius and the central angle of the concave portion 43111 and the convex portion 43112 can be kept equal to facilitate bending or machining the metal strip 4311.

In other alternative embodiments, as shown in fig. 1d, the recess 43111 may have two mutually angled side walls, and the protrusion 43112 may also have two mutually angled side walls, that is, the cross-sectional pattern of the metal strip 4311 in the radial direction of the cable is close to a "Z" shape, and in order to facilitate bending or machining of the metal strip 4311, the angle between the two side walls of the recess 43111 and the protrusion 43112 may be kept equal, and the two opposite side walls of the recess 43111 and the protrusion 43112 are parallel to each other and have the same length.

It should be noted that the concave portion 43111 and the convex portion 43112 may have other shapes, so long as the convex portion 43112 or the concave portion 43111 of one of the two adjacent metal strips 4311 can block the concave portion 43111 or the convex portion 43112 of the other one, the object of the embodiment of the present application can be achieved, and here, the specific shapes of the concave portion 43111 and the convex portion 43112 are not limited.

When the armor 43 includes a plurality of armor units 431, the metal strips 4311 may have other shapes, for example, the metal strips 4311 in two adjacent armor units 431 are distributed in a staggered manner in the radial direction of the cable. In this way, the metal strip 4311 in the inner-layer armor unit 431 can provide a certain barrier to the metal strip 4311 in the outer-layer armor unit 431.

As shown in fig. 1e, in some specific embodiments, the surface of the metal strip 4311 facing the inside of the cable and the surface facing the outside of the cable have different extending lengths in the circumferential direction of the cable, that is, the cross-sectional pattern of the metal strip 4311 in the radial direction of the cable may be trapezoidal. Here, the sectional pattern of the metal strip 4311 in the cable radial direction is not particularly limited.

Fig. 6 is a schematic structural diagram of a filling unit in a deep-water submarine cable according to an embodiment of the present application.

As shown in fig. 1a, 1b, 1c, 1d and 1e, the deep-water submarine cable according to the embodiment of the present invention further includes a plurality of filling units 5, the filling units 5 are filled in an area surrounded by the protection unit 4, the cable core 1 and the buffer support 2, and an outer circumferential wall of each filling unit 5 is attached to an inner circumferential wall of the protection unit 4. In this way, even if the protective layer moves or sags toward the center of the cable under the condition of too large pressing force, the filling unit 5 can block the protective layer to ensure the electrical performance of the deep water submarine cable provided by the embodiment of the present application.

The filling unit 5 may be formed by extruding polyethylene or polypropylene. Here, the extrusion material used for the filling unit 5 is not particularly limited.

In some alternative embodiments, the inner circumferential wall of the filling unit 5 comprises a first arc section 51 and two second arc sections 52, the first arc section 51 is located between the two second arc sections 52, the first arc section 51 is attached to the outer circumferential wall of the corresponding support portion 21, the second arc section 52 is attached to the outer circumferential wall of the corresponding cable core 1, that is, the radius of the first arc section 51 is equal to that of the support portion, and the radius of the second arc section 52 is equal to that of the corresponding cable core 1.

In a specific implementation manner of this embodiment, when the number of the cable cores 1 is three, the central angle corresponding to the first arc segment 51 is 60 °, and the central angle corresponding to the second arc segment 52 is 120 °. When the number of the cable cores 1 is larger than three, the specific shapes of the corresponding filling units 5 are not described.

The deepwater submarine cable comprises a cable core, a buffer supporting piece, an optical fiber unit and a protection unit; the number of the cable cores is at least three; the buffer support member is arranged among the cable cores, and the hardness of the buffer support member is less than that of the peripheral wall of each cable core; the edge of the buffer support part is provided with support parts and notches which are distributed at intervals, the support parts are provided with accommodating spaces for accommodating the optical fiber units, and at least part of the cable core is positioned in the notches; the protection unit coats the cable cores, the buffer support piece and the optical fiber unit, and the inner peripheral wall of the protection unit is attached to the outer peripheral wall of each cable core. The deep water submarine cable provided by the application has higher electrical performance and is not easy to break down.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.