A deep water subsea cable

Abstract

The application is suitable for the technical field of deep-sea cable, and provides a deep-water submarine cable, which comprises a plurality of conductive cores and an outer protective structure, the outer protective structure wrapping the plurality of conductive cores; a filling strip structure is arranged between two adjacent conductive cores; wherein the filling strip structure comprises a supporting air bag and a contraction air bag, the contraction air bag is sleeved on the outer wall of the supporting air bag, a contraction cavity is formed between the two, and the two are communicated through a ventilation structure; the contraction air bag comprises an expansion state and a contraction state, when the pressure in the supporting air bag is greater than the pressure in the contraction air bag, the contraction air bag is in the expansion state; when the pressure in the supporting air bag is less than the pressure in the contraction air bag, the contraction air bag is switched from the expansion state to the contraction state. The deep-water submarine cable provided by the application can also ensure sufficient supporting force and keep the cable from being damaged when being bent or subjected to a large pressure.

Description

Technical Field

[0001] This invention relates to the field of deep-sea cable technology, and in particular to a deep-sea submarine cable. Background Technology

[0002] With the development of offshore wind power and the national economy, the demand for submarine cables is increasing, and the requirements for their reliability and environmental protection are also becoming more stringent.

[0003] In existing technologies, submarine cables include multiple conductive cores. To ensure the stability of these cores, a filler strip structure is typically placed between adjacent cores. Most current filler strip structures are hollow, which suffers from low buffering capacity when subjected to high seawater pressure. This can lead to the filler strip structure being crushed and unable to recover, failing to provide continued support for the cable's outer protective structure. Consequently, the performance of the conductive cores is affected, signal transmission is interrupted, and the cable is unsuitable for laying in deep waters. Summary of the Invention

[0004] The purpose of this invention is to provide a deep-sea submarine cable to solve the aforementioned technical problems in the prior art, mainly including the following:

[0005] This application provides a deep-sea submarine cable, comprising:

[0006] The device comprises multiple conductive cores and an outer protective structure, wherein the outer protective structure encloses the multiple conductive cores; the multiple conductive cores are twisted together, and a filler strip structure is provided between two adjacent conductive cores;

[0007] The filling strip structure includes a supporting airbag and a contracting airbag. The contracting airbag is sleeved on the outer wall of the supporting airbag. The contracting airbag and the supporting airbag are connected by a ventilation structure. A contraction cavity is formed between the contracting airbag and the supporting airbag. A support member is fixedly installed in the contraction cavity. The support member extends along the length direction of the conductive core.

[0008] The contractile airbag includes an expanded state and a contracted state. When the pressure in the support airbag is greater than the pressure in the contractile airbag, some of the gas in the support airbag enters the contraction chamber, and the contractile airbag is in an expanded state. When the pressure in the support airbag is less than the pressure in the contractile airbag, some of the gas in the contractile airbag enters the inflation chamber of the support airbag, and the contractile airbag switches from an expanded state to a contracted state.

[0009] To further improve the implementation of this application, the following structure is specifically adopted: the support member includes a support column and a connecting sleeve, the connecting sleeve is fixedly sleeved on the support column, and the connecting sleeve is fixedly connected to the support airbag and the contraction airbag.

[0010] To further improve the implementation of this application, the following structure is specifically adopted: the support member includes at least a first support member, a second support member, and a third support member;

[0011] The first support member is located at the junction of the first conductive core and the outer protective structure, the second support member is located at the junction of the second conductive core and the outer protective structure, and the third support member is located at the junction of the first conductive core and the second conductive core.

[0012] To further improve the implementation of this application, the following structure is specifically adopted: reinforcing ribs are provided on the surface of the supporting airbag.

[0013] To further improve the implementation of this application, the following structure is specifically adopted: a contraction groove is provided on the surface of the contraction airbag, and the contraction groove extends along the length direction of the conductive core.

[0014] To further improve the implementation of this application, the following structure is specifically adopted: a support frame is provided inside the inflation chamber of the support airbag, the support frame has a hollow structure, and the support frame abuts against the support airbag.

[0015] To further improve the implementation of this application, the following structure is specifically adopted: the ventilation structure includes a ventilation shell and a pair of ventilation valves; each pair of ventilation valves is symmetrically arranged; one end of each ventilation valve is connected to the inner wall of the ventilation shell, and the other end extends towards the air intake direction of the ventilation structure; there are multiple pairs of ventilation valves along the axial direction of the ventilation shell; a ventilation hole is formed between each pair of ventilation valves; the ventilation valves are made of flexible material; in the same ventilation hole, the cross-sectional area of ​​the ventilation hole in the air intake state is larger than the cross-sectional area of ​​the ventilation hole in the air return state.

[0016] To further improve the implementation of this application, the following configuration structure is adopted: along the air intake direction of the ventilation structure, the cross-sectional area of ​​the ventilation shell gradually decreases.

[0017] To further improve the implementation of this application, the following structure is specifically adopted: extending along the length of the conductive core, the intermediate air bladder is provided with an optical fiber sensor for measuring water pressure.

[0018] To further improve the implementation of this application, the following structure is specifically adopted: along the length of the conductive core, there are multiple pairs of filling strip structures, and multiple filling strip structures are connected in sequence; each filling strip structure is an independent airbag structure.

[0019] Compared with the prior art, the present invention has at least the following technical effects:

[0020] The deep-sea submarine cable provided in this application utilizes a filler strip structure between two adjacent conductive cores. This filler strip structure includes a supporting air bladder and a contracting air bladder. The contracting air bladder is fitted onto the outer wall of the supporting air bladder, and a contraction cavity is formed between the inner wall of the contracting air bladder and the outer wall of the supporting air bladder. A venting structure connects the inflation cavity of the supporting air bladder and the contraction cavity of the contracting air bladder. When the pressure in the supporting air bladder is greater than the pressure in the contracting air bladder, some gas from the supporting air bladder enters the contraction cavity, causing the contracting air bladder to expand and release gas promptly, thus maintaining the supporting force of the filler strip structure. When the pressure in the supporting air bladder is less than the pressure in the contracting air bladder, some gas from the contracting air bladder enters the inflation cavity of the supporting air bladder, causing the contracting air bladder to switch from an expanded to a contracted state. This filler strip structure can continue to provide sufficient support to the submarine cable under significant pressure, can return to its initial shape, is not easily damaged, and eliminates the need for processes such as glue application, reducing manufacturing steps. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the cross-section of the deep-sea submarine cable in this application;

[0023] Figure 2 This is a cross-sectional schematic diagram of the filling strip structure in this invention;

[0024] Figure 3 This is a schematic diagram of the support frame in this invention;

[0025] Figure 4 This is a schematic diagram of the support structure in this invention;

[0026] Figure 5 This is a schematic diagram of the ventilation structure in this invention.

[0027] In the picture:

[0028] 10. Conductive core; 11. First conductive core; 12. Second conductive core; 13. Third conductive core;

[0029] 20. External protective structure;

[0030] 30. Filler strip structure;

[0031] 31. Support airbag; 311. Inflation chamber;

[0032] 32. Contraction airbag; 321. Contraction groove; 3132. Contraction chamber;

[0033] 33. Support component; 331. Support column; 332. Connecting sleeve; 333. First support component; 334. Second support component; 335. Third support component;

[0034] 34. Support frame;

[0035] 40. Intermediate airbag;

[0036] 50. Fiber optic sensors;

[0037] 60. Ventilation structure; 61. Ventilation shell; 62. Ventilation valve; 63. Ventilation port. Detailed Implementation

[0038] The following description provides many different embodiments or examples for implementing various features of this application. The elements and arrangements described in the specific examples below are only for concise expression of this application and are merely examples, not intended to limit this application.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to represent selected embodiments of this application.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0041] In this application, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" a first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In existing technologies, submarine cables include multiple conductive cores. To ensure the stability of these cores, a filler strip structure is typically placed between adjacent cores. However, current filler strips present the following technical problems:

[0043] 1. When the current filler strip is subjected to high pressure in the deep sea, it may bend or deform. When the pressure decreases, the filler strip cannot return to its original shape and cannot continue to provide sufficient support for the outer protective structure, causing the outer protective structure to be dented or damaged, thus preventing the signal from being transmitted normally.

[0044] 2. When subjected to high pressure, the cushioning function of the filler strip is low, and it is easily damaged.

[0045] 3. After the existing filler strips are installed between the conductive core and the outer protective structure, additional steps such as potting are required, which involves many processes.

[0046] In view of this, this application provides a deep-sea submarine cable, such as Figures 1-5 As shown, it includes:

[0047] Multiple conductive cores 10 and an outer protective structure 20 are provided, wherein the outer protective structure 20 encloses the multiple conductive cores 10; the multiple conductive cores 10 are twisted together, and a filler strip structure 30 is provided between two adjacent conductive cores 10.

[0048] For example, the conductive core 10 is elongated and has an internal conductor for transmitting electrical energy. In a submarine cable, there may be three conductive cores 10, such as a first conductive core 11, a second conductive core 12, and a third conductive core 13, tightly twisted together. The conductive core 10 is enclosed by an outer protective structure 20 to prevent water ingress and ensure its performance. After the multiple conductive cores 10 are twisted together, gaps form between the outer walls of adjacent conductive cores 10, resulting in structural instability. Therefore, a filler strip structure 30 is provided in these gaps to fix adjacent conductive cores 10. The filler strip structures 30 in the gaps between adjacent conductive cores 10 are identical.

[0049] The filling strip structure 30 includes a supporting airbag 31 and a contracting airbag 32. The contracting airbag 32 is sleeved on the outer wall of the supporting airbag 31. The contracting airbag 32 and the supporting airbag 31 are connected by a ventilation structure 60. A contraction cavity 3132 is formed between the contracting airbag 32 and the supporting airbag 31. A support member 33 is fixedly disposed in the contraction cavity 3132. The support member 33 extends along the length direction of the conductive core 10.

[0050] For example, the shape of the filler strip structure 30 is adapted to the shape of the gap formed between the outer walls of two adjacent conductive cores 10. The surface of the contraction airbag 32 is wrinkled, allowing the contraction airbag 32 to expand and contract along a preset shape. The contraction airbag 32 is sleeved on the outer wall of the support airbag 31, and a contraction cavity 3132 is formed between the inner wall of the contraction airbag 32 and the outer wall of the support airbag 31. The inflation cavity 311 and the contraction cavity 3132 of the support airbag 31 can be connected through the ventilation structure 60, which allows the gas in the support airbag 31 and the gas in the contraction airbag 32 to flow to each other, thereby enabling the filler strip structure 30 to dynamically adjust in time when subjected to different pressures.

[0051] It should be noted that, as Figures 1-3 As shown, the black dots filling the inflation chamber 311 of the supporting airbag 31 are for easy display of the inflation chamber 311. The cross-section of the supporting member 33 is distinguished by cross-sectional lines for easy identification.

[0052] For example, a support member 33 is installed at the connection between the support airbag 31 and the contraction airbag 32 and in the contraction cavity 3132. The support member 33 can provide support for the outer protective structure 20 and the conductive core 10, increase the support force of the support airbag 31 on the conductive core 10 and the outer protective structure 20. At the same time, the setting of the support member 33 can also make the support airbag 31 form a preset shape after inflation, avoiding the situation where the support airbag 31 is twisted and the gas cannot be filled smoothly.

[0053] The support member 33 creates a contraction space between the outer wall of the support airbag 31 and the inner wall of the outer protective structure 20, allowing the contraction airbag 32 to expand and contract radially within this space. Multiple support members 33 are arranged within the contraction cavity 3132, dividing the contraction airbag 32 into multiple sub-contraction airbags. For example, a sub-contraction airbag is formed between two adjacent support members 33, with both ends of the sub-contraction airbag sealed to the corresponding support member 33. Each sub-contraction airbag communicates with the inflation cavity 311 of the support airbag 31 via the ventilation structure 60. When the support airbag 31 is subjected to significant pressure, gas can be simultaneously transmitted to multiple sub-contraction airbags, releasing pressure promptly. The adjacent support members 33 also divide the contraction space into multiple sub-contraction spaces, allowing the sub-contraction airbags to expand and contract smoothly within these spaces. After expansion, the sub-contraction airbags bulge between adjacent support members 33, forming multiple support points for better support of the conductive core 10 and the outer protective structure 20.

[0054] In some alternative embodiments, the cross-section of the coastal cable has a smaller area for the support airbag 31 than for the contraction airbag 32, which can prevent the support airbag 31 from breaking under high pressure.

[0055] In some alternative embodiments, the support 33 is sealed to the inner wall of the contraction airbag 32.

[0056] In some alternative embodiments, nitrogen may preferably be used to fill the support airbag 31 and the contraction airbag 32.

[0057] The contractile airbag 32 includes an expanded state and a contracted state. When the pressure in the support airbag 31 is greater than the pressure in the contractile airbag 32, some of the gas in the support airbag 31 enters the contraction chamber 3132, and the contractile airbag 32 is in an expanded state. When the pressure in the support airbag 31 is less than the pressure in the contractile airbag 32, some of the gas in the contractile airbag 32 enters the inflation chamber 311 of the support airbag 31, and the contractile airbag 32 switches from an expanded state to a contracted state.

[0058] For example, when a section of the submarine cable is bent or compressed, the pressure in the support airbag 31 increases. If the gas is not released in time, the support airbag 31 will rupture at the bend or compression point, and the rupture shape will be irregular. The gas will disperse instantly. When the compression force disappears, the gas has already dispersed and cannot re-enter the support airbag 31, thereby damaging the conductive core 10. Therefore, in this application, a contraction airbag 32 is provided on the outer wall of the support airbag 31. When the pressure on the support airbag 31 exceeds a preset value, the gas in the inflation chamber 311 of the support airbag 31 will enter the contraction chamber 3132 through the ventilation structure 60. The contraction airbag 32 switches from a contracted state to an expanded state, allowing the gas in the support airbag 31 to be released, while the gas remains in the contraction chamber 3132. At this time, the support airbag 31 and the contraction airbag 32 together provide support for the outer protective structure 20 and the conductive core 10, ensuring the normal transmission of submarine cable signals. When the submarine cable is subjected to violent impacts from seawater, the gas in the contraction airbag 32 will be discharged into the support airbag 31, causing the contraction airbag 32 to switch from an expanded state to a contracted state, thus preparing for the exhaust of the support airbag 31.

[0059] Therefore, the deep-sea submarine cable provided in this application uses a filler strip structure 30 arranged between two adjacent conductive cores 10. The filler strip structure includes a support airbag 31 and a contraction airbag 32. The contraction airbag 32 is sleeved on the outer wall of the support airbag 31. A contraction cavity 3132 is formed between the inner wall of the contraction airbag 32 and the outer wall of the support airbag 31. The air venting structure 60 connects the inflation cavity 311 of the support airbag 31 and the contraction cavity 3132 of the contraction airbag 32. When the pressure in the support airbag 31 is greater than the pressure in the contraction airbag 32, some of the gas in the support airbag 31 enters the contraction chamber 3132, and the contraction airbag 32 is in an expanded state, allowing the gas in the support airbag 31 to be released in a timely manner, while ensuring the supporting force of the filler strip structure 30. When the pressure in the support airbag 31 is less than the pressure in the contraction airbag 32, some of the gas in the contraction airbag 32 enters the inflation chamber 311 of the support airbag 31, and the contraction airbag 32 switches from the expanded state to the contracted state. The filler strip structure 30 of this application can continue to provide sufficient support for the submarine cable under great pressure, can return to its initial shape, is not easily damaged, and does not require processes such as glue filling, reducing manufacturing process steps.

[0060] According to some optional embodiments, the support member 33 includes a support column 331 and a connecting sleeve 332, the connecting sleeve 332 being fixedly sleeved on the support column 331, and the connecting sleeve 332 being fixedly connected to the support airbag 31 and the contraction airbag 32.

[0061] For example, the support column 331 can be made of rigid material, while the connecting sleeve 332 can be made of flexible material. The support column 331 can better fix the ends of the support airbag 31 and the contraction airbag 32 in the gap, and when the support airbag 31 and the contraction airbag 32 are inflated, they only extend in the radial direction and their length in the longitudinal direction remains unchanged. The ends of the support airbag 31 and the contraction airbag 32 can be fixedly connected to the connecting sleeve 332 by adhesive, which also avoids the support member 33 from scratching the conductive core 10.

[0062] In some optional embodiments, multiple support members 33 are spaced apart in the contraction cavity 3132 formed by the supporting airbag 31 and the contraction airbag 32. The support members 33 are fixedly attached to the contraction cavity 3132, and multiple contraction cavities 3132 are defined between two adjacent support members 33. At the same time, two adjacent support members 33 also define a storage space to facilitate the contraction and expansion of the contraction airbag 32. When the contraction airbag 32 is in the expanded state, the contraction airbag 32 protrudes from between two adjacent support members 33 to form a support portion. This support portion abuts against the outer protective structure 20 and the conductive core 10, providing greater support force.

[0063] According to some optional embodiments, the support member 33 includes at least a first support member 333, a second support member 334, and a third support member 335;

[0064] The first support member 333 is located at the junction of the first conductive core 11 and the outer protective structure 20, the second support member 334 is located at the junction of the second conductive core 12 and the outer protective structure 20, and the third support member 335 is located at the junction of the first conductive core 11 and the second conductive core 12.

[0065] In the above scheme, the first support member 333 is installed near the first conductive core 11 and the outer protective structure 20, making it difficult for the first support member 333 to move. The second support member 334 is installed near the second conductive core 12 and the outer protective structure 20, making it difficult for the second support member 334 to move. The third support member 335 is installed at the junction of the first conductive core 11 and the second conductive core 12, and the two clamp the third support member 335, ensuring that the third support member 335 can be kept in its current position.

[0066] In some alternative embodiments, the shape of the support member 33 can match the shape of its location, and there is no limitation. For example, the first support member 333, the second support member 334, and the third support member 335 are circular, while the support member 33 between the contraction airbag 32 and the contraction cavity 3132 of the support airbag 31 can be elliptical.

[0067] In some alternative embodiments, the support member 33 can be installed in the gap formed by multiple conductive cores 10 by twisting. When the support member 33 at a certain position is damaged, it can be removed and replaced without replacing the entire submarine cable.

[0068] According to some alternative embodiments, the surface of the support airbag 31 is provided with reinforcing ribs.

[0069] In the above scheme, the reinforcing ribs can be honeycomb-shaped. This design can increase the tension of the support airbag 31 during inflation and also allow the support airbag 31 to maintain a good inflation shape, so that the pressure can be applied more effectively to the outer wall of the support airbag 31, improve the expansion uniformity of the outer wall of the support airbag 31, and better provide support for the submarine cable.

[0070] In this application, the support airbag 31 serves as the main support airbag and needs to have sufficient support force, while the retractable airbag 32 serves as a backup airbag.

[0071] According to some alternative embodiments, a shrinkage groove 321 is provided on the surface of the shrinkage airbag 32, and the shrinkage groove 321 extends along the length direction of the conductive core 10.

[0072] In the above scheme, the shape of the contraction groove 321 is not limited and can be arc-shaped. With the setting of the contraction groove 321, when the gas in the support airbag 31 enters the contraction airbag 32, the contraction airbag 32 can open in a preset shape. When the gas in the contraction airbag 32 enters the support airbag 31, the contraction groove 321 facilitates the contraction of the contraction airbag 32 along the groove, ensuring that the contraction airbag 32 maintains a good shape after contraction, preventing the contraction airbags 32 from overlapping unevenly.

[0073] According to some optional embodiments, a support frame 34 is provided inside the inflation cavity 311 of the support airbag 31. The support frame 34 has a hollow structure and abuts against the inner wall of the support airbag 31.

[0074] In the above scheme, the structure of the support frame 34 is adapted to the shape of the inflation chamber 311 of the support airbag 31. The support frame 34 is used to provide support for the support airbag 31, so that the support airbag 31 can withstand greater pressure. When the pressure disappears, the support airbag 31 can quickly return to its initial state, which can ensure the stability of the submarine cable and improve the pressure bearing capacity of the submarine cable.

[0075] According to some optional embodiments, the ventilation structure 60 includes a ventilation housing 61 and a pair of ventilation valves 62; each pair of ventilation valves 62 is symmetrically arranged; one end of each ventilation valve 62 is connected to the inner wall of the ventilation housing 61, for example, one end of the ventilation valve 62 is fixedly connected to the inner wall of the ventilation housing 61, and the other end of the ventilation valve 62 extends toward the air intake direction of the ventilation structure 60, for example, the ventilation valve 62 is inclined along the air intake direction of the ventilation structure 60; there are multiple pairs of ventilation valves 62 along the axial direction of the ventilation housing 61; a ventilation hole 63 is formed between each pair of ventilation valves 62; the ventilation valves 62 are made of flexible material; in the same ventilation hole 63, the cross-sectional area of ​​the ventilation hole 63 in the air intake state is larger than the cross-sectional area of ​​the ventilation hole 63 in the air return state. The air intake direction of the ventilation structure 60 is opposite to or approximately opposite to the air return direction of the ventilation structure 60. In some embodiments, the number of pairs of ventilation valves 62 is 2, 3, 5, or other numbers, and the specific number of pairs of ventilation valves 62 can be determined according to the actual situation. In some embodiments, the aperture of the ventilator holes 63 formed by all pairs of ventilation valves 62 can be the same, different, or partially the same. In this embodiment, the ventilation structure 60 extends towards the air intake direction of the ventilation structure 60 through the other end of the ventilation valves 62, so that each pair of ventilation valves 62 deforms under the drive of air intake to form a larger ventilator hole 63, and deforms under the drive of air return to form a relatively smaller ventilator hole 63, thereby satisfying that the cross-sectional area of ​​the ventilator hole 63 in the air intake state is larger than the cross-sectional area of ​​the ventilator hole 63 in the air return state. In this embodiment, in the same vent 63, the cross-sectional area of ​​the vent 63 in the air intake state is larger than the cross-sectional area of ​​the vent 63 in the air return state, so that the venting structure 60 can quickly intake air when it is in the air intake state, and slowly return air when it is in the air return state.

[0076] It should be noted that when the ventilation structure 60 is in the air intake state, for example, when the gas in the support airbag 31 flows into the contraction airbag 32, the gas in the support airbag 31 can quickly enter into the contraction airbag 32, timely discharge some gas, release pressure, and prevent the support airbag 31 from being damaged, gas from overflowing, and unable to be retracted, thus losing the support of the external protection structure 20 and the conductive core 10. When the ventilation structure 60 is in the air return state, for example, when the gas in the contraction airbag 32 flows into the support airbag 31, the gas in the contraction airbag 32 can slowly enter into the support airbag 31, and the contraction airbag 32 can slowly contract into the preset shape according to the contraction groove 321, avoiding the overlapping or stacking of the contraction airbags 32 caused by rapid contraction.

[0077] In some embodiments, the ventilation valve 62 is made of materials such as silicone, rubber, or latex, so that the ventilation valve 62 can easily deform under the drive of air intake or air return.

[0078] Optionally, the vent housing 61 can be made of polyimide or other materials. The polyimide material of the vent housing 61 provides pressure and corrosion resistance.

[0079] According to some alternative embodiments, the cross-sectional area of ​​the vent housing 61 gradually decreases along the air intake direction of the venting structure 60. For example, the vent housing 61 is trumpet-shaped. By gradually decreasing the cross-sectional area of ​​the vent housing 61 along the air intake direction of the venting structure 60, it is beneficial for the venting structure 60 to quickly intake air when it is in the air intake state, and to slowly return air when it is in the air return state.

[0080] According to some alternative embodiments, the intermediate air bladder 40 is provided with an optical fiber sensor 50 for measuring water pressure, extending along the length of the conductive core 10.

[0081] In the above scheme, the air pressure in each filler strip structure 30 can be monitored in real time by fiber optic sensor 50, which facilitates timely understanding of the pressure status of the submarine cable and signal transmission.

[0082] In this embodiment, the conductive core 10 may include, for example, a water-blocking conductor, an insulating layer, a shielding layer, and a protective layer arranged sequentially from the inside to the outside; or, the conductive core 10 may include: a water-blocking conductor, and a conductor shielding layer, a cross-linked polyethylene insulating layer, an insulating shielding layer, an inner semiconducting water-blocking tape wrapping layer, a metal shielding layer, an outer semiconducting water-blocking tape wrapping layer, an aluminum-plastic composite tape layer, and a phase-separating sheath arranged sequentially around the water-blocking conductor.

[0083] In this embodiment, the outer protective structure 20 may include, for example, an inner sheath, a first armor layer, a first armor strap, a second armor layer, a second armor strap, and an outer sheath, which are sequentially disposed around the conductive core 10 and the filler strip structure 30.

[0084] According to some optional embodiments, there are multiple filler strip structures 30 along the length direction of the conductive core 10, and the multiple filler strip structures 30 are connected in sequence; each filler strip structure 30 is an independent airbag structure.

[0085] In the above scheme, two adjacent filler strip structures 30 are not connected. When any one of the filler strip structures 30 breaks, it will not affect the other filler strip structures 30.

[0086] In an optional embodiment, there are multiple filler strip structures 30 along the length of the cable, and these multiple filler strip structures 30 are connected sequentially; the internal cavities of each filler strip structure 30 are not interconnected. That is, each filler strip structure 30 is independent of the others and does not affect them. Even if one filler strip structure 30 is broken, the other filler strip structures 30 will not be affected.

[0087] In an optional embodiment, there are multiple filler strip structures 30 along the circumference of the cable, and the filler strip structures 30 are disposed between two adjacent conductive cores 10.

[0088] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A deep-sea submarine cable, characterized in that, include: Multiple conductive cores (10) and an outer protective structure (20), wherein the outer protective structure (20) wraps the multiple conductive cores (10); the multiple conductive cores (10) are twisted together, and a filler strip structure (30) is provided between two adjacent conductive cores (10). The filling strip structure (30) includes a supporting airbag (31) and a contracting airbag (32). The contracting airbag (32) is sleeved on the outer wall of the supporting airbag (31). The contracting airbag (32) and the supporting airbag (31) are connected by a ventilation structure (60). A contraction cavity (3132) is formed between the contracting airbag (32) and the supporting airbag (31). A support member (33) is fixedly installed in the contraction cavity (3132). The support member (33) extends along the length direction of the conductive core (10). The contractile airbag (32) includes an expanded state and a contracted state. When the pressure in the support airbag (31) is greater than the pressure in the contractile airbag (32), some of the gas in the support airbag (31) enters the contraction chamber (3132), and the contractile airbag (32) is in an expanded state. When the pressure in the support airbag (31) is less than the pressure in the contractile airbag (32), some of the gas in the contractile airbag (32) enters the inflation chamber (311) of the support airbag (31), and the contractile airbag (32) switches from an expanded state to a contracted state. The surface of the contraction airbag (32) is provided with a contraction groove (321), which extends along the length direction of the conductive core (10). The ventilation structure (60) has a ventilation hole (63), and the cross-sectional area of ​​the ventilation hole (63) in the air intake state is larger than the cross-sectional area of ​​the ventilation hole (63) in the air return state. Along the length direction of the conductive core (10), there are multiple filling strip structures (30), and multiple filling strip structures (30) are connected in sequence; each filling strip structure (30) is an independent airbag structure.

2. The deep-sea submarine cable as described in claim 1, characterized in that, The support member (33) includes a support column (331) and a connecting sleeve (332). The connecting sleeve (332) is fixedly sleeved on the support column (331) and is fixedly connected to the support airbag (31) and the contraction airbag (32).

3. The deep-sea submarine cable as described in claim 2, characterized in that, The support member (33) includes at least a first support member (333), a second support member (334) and a third support member (335); The first support member (333) is located at the junction of the first conductive core (11) and the outer protective structure (20), the second support member (334) is located at the junction of the second conductive core (12) and the outer protective structure (20), and the third support member (335) is located at the junction of the first conductive core (11) and the second conductive core (12).

4. The deep-sea submarine cable as described in claim 1, characterized in that, The surface of the support airbag (31) is provided with reinforcing ribs.

5. The deep-sea submarine cable as described in claim 1, characterized in that, A support frame (34) is provided inside the inflation chamber (311) of the support airbag (31). The support frame (34) has a hollow structure and abuts against the support airbag (31).

6. The deep-sea submarine cable as described in claim 1, characterized in that, The ventilation structure (60) includes a ventilation shell (61) and a pair of ventilation valves (62); each pair of ventilation valves (62) is symmetrically arranged; one end of each ventilation valve (62) is connected to the inner wall of the ventilation shell (61), and the other end extends toward the air intake direction of the ventilation structure (60); along the axial direction of the ventilation shell (61), there are multiple pairs of ventilation valves (62); a ventilation hole (63) is formed between each pair of ventilation valves (62); the ventilation valves (62) are made of flexible material.

7. The deep-sea submarine cable as described in claim 6, characterized in that, Along the air intake direction of the ventilation structure (60), the cross-sectional area of ​​the ventilation housing (61) gradually decreases.

8. The deep-sea submarine cable as described in claim 1, characterized in that, It also includes an intermediate airbag (40) that extends along the length of the conductive core (10) and is provided with an optical fiber sensor (50) for measuring water pressure.

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