Lightweight submarine cable

Abstract

The utility model discloses a lightweight submarine cable, comprising a body, the outer ring of the body is provided with an armor layer (1), the armor layer (1) is formed by braiding aluminum alloy wires plated with semi-conductive films, the outer layer of the armor layer (1) is provided with a polypropylene rope outer cover (2), the inner layer of the armor layer (1) is provided with a polypropylene rope lining (3), the inner ring of the body is provided with an electric unit conductor (4), and the outer ring of the body is provided with a sheath (5). Each electric unit conductor (4) is wrapped by a conductor shielding layer (5), an insulating layer (6) and an insulation shielding layer (7) from inside to outside, and the insulating layer (6) is formed by extrusion molding of a polypropylene material. According to the light-weight submarine cable, the submarine cable weight is reduced, the submarine cable laying requirement is reduced, and the laying cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of submarine cables, in particular to a lightweight submarine cable. Background Art

[0002] With the development of marine resources, offshore platforms are being built farther and farther from shore, resulting in longer and longer submarine cables being laid. Correspondingly, the weight of submarine cables is getting heavier, and the requirements for heavy equipment used to lay submarine cables are also getting higher and higher. In order to meet the laying needs, the tonnage of laying ships is also getting larger, which greatly increases the laying cost of submarine cables. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a lightweight submarine cable which reduces the weight of the submarine cable, thereby reducing the demand for laying the submarine cable and reducing the laying cost.

[0004] The technical solution adopted by the utility model to solve the above-mentioned problem is: a lightweight submarine cable, including a main body, the outer ring of the main body is provided with an armor layer, the armor layer is woven by aluminum alloy wire plated with a semi-conductive film, the outer layer of the armor layer is provided with a polypropylene rope outer sheath, the inner layer of the armor layer is provided with a polypropylene rope lining, the inner ring of the main body is provided with an electric unit conductor, the electric unit conductor is wrapped with a conductor shielding layer, an insulating layer and an insulating shielding layer from the inside to the outside, and the insulating layer is extruded by polypropylene material.

[0005] Compared with the prior art, the advantages of the utility model are as follows: the traditional armor layer mainly adopts a steel wire structure, which is heavy and has large losses, while the design of the armor layer adopts aluminum alloy wire coated with a semi-conductive film, which not only reduces the weight of the armor layer, but also solves the problem of long-term corrosion of the aluminum alloy wire in seawater because of the material of the semi-conductive film, and also solves the problem of electrical connectivity between aluminum wires; and the design of providing a polypropylene rope outer sheath on the outer layer of the armor layer and a polypropylene rope lining on the inner layer of the armor layer can utilize the wear resistance and seawater corrosion resistance of polypropylene to protect the armor layer, prevent the semi-conductive film on the surface of the aluminum alloy wire from being worn, and ensure the mechanical stability of the submarine cable in the complex environment of the seabed. Stability and service life; at the same time, the traditional steel wire armor layer also has a corresponding polyethylene (PE) material or other material sheath layer structure on its outer layer, and the material density of polypropylene (PP) is slightly smaller than that of polyethylene (PE) under the same density pressure, which also plays a role in reducing the weight of the submarine cable; similarly, the use of polypropylene (PP) in the insulation layer also plays a role in reducing the weight of the submarine cable compared to polyethylene (PE), thereby reducing the weight of the submarine cable from multiple angles. For ultra-long submarine cables, the weight reduction is large, which reduces the difficulty of submarine cable transportation and laying, and correspondingly reduces the dependence on heavy equipment required for submarine cable laying, indirectly reducing the laying cost of the submarine cable.

[0006] As an improvement of the utility model, a plurality of electric unit conductors are arranged in the body, and the outer layers of the plurality of electric unit conductors are bound into a bundle with a circular cross-section by a rubber-coated cloth tape, and the gap between two of the electric unit conductors and the rubber-coated cloth tape is filled with a polypropylene filling strip. Through the improvement, polypropylene filling strips are used to fill the gaps among the plurality of electric unit conductors. While ensuring the mechanical strength of the filling, compared with filling strips made of other materials, the weight of the submarine cable is also reduced.

[0007] As an improvement of the utility model, a plurality of optical unit conductors are further provided in the body, and an embedding groove for installing the optical unit conductor is provided on the polypropylene filling strip, and the embedding groove is arranged at one end of the polypropylene filling strip connected to the rubber-coated cloth tape. Through the improvement, the installation of the optical unit conductor in the submarine cable is realized, and the roundness of the submarine cable is ensured at the same time.

[0008] As an improvement of the utility model, the embedding groove is arranged on the symmetric plane of the polypropylene filling strip. Through the improvement, the optical unit conductor is subjected to more uniform force in the submarine cable to avoid extrusion deformation, while also ensuring the uniformity of the weight distribution of the submarine cable and the stability of the mechanical properties of the submarine cable.

[0009] As an improvement of the utility model, a hollow cavity is provided inside the polypropylene filling strip, and the weight of the submarine cable is further reduced through the improvement.

[0010] As an improvement of the utility model, radial support ribs and central support ribs are provided in the hollow cavity, the radial support ribs are arranged along the radial direction of the body, and the central support ribs are arranged along the central connecting line between the electrical unit conductor and the optical unit conductor. Through the improvement, due to the design of the hollow cavity, when the submarine cable is bent, the strength of the hollow cavity is weak and it is easy to deform, thereby causing deformation of the submarine cable. Therefore, radial support ribs and central support ribs are added in the deformation area of ​​the hollow cavity that is easily squeezed to ensure the use quality of the polypropylene filling strip, which is not easy to deform.

[0011] As an improvement of the present invention, the outer layer of the electric unit conductor is also provided with an aluminum alloy wire shielding layer and an aluminum alloy tape anti-tie layer, the aluminum alloy wire shielding layer is arranged on the outer layer of the insulating shielding layer, and a semi-conductive resistance water tape is arranged between the aluminum alloy wire shielding layer and the insulating shielding layer. Through the improvement, the aluminum alloy wire shielding layer and the aluminum alloy tape anti-tie layer are used to form a double metal shielding layer to avoid electromagnetic interference between the electric unit conductors, wherein the aluminum alloy tape anti-tie layer can also enhance the mechanical stress resistance of the electric unit conductor. For example, in the reciprocating bending process of the submarine cable, if there is only one layer of aluminum alloy wire shielding layer and its winding method is single, the aluminum alloy wire in the aluminum alloy wire shielding layer may break. After adding a layer of aluminum alloy tape anti-tie layer, the bending stress it is subjected to is always opposite to that of the aluminum alloy wire shielding layer, thereby ensuring the integrity of the bending stress resistance in the bending process of the submarine cable, avoiding the breakage of the aluminum alloy wire in the aluminum alloy wire shielding layer, and ensuring the long-term effectiveness of the metal shielding; and the semi-conductive resistance water tape plays a water-blocking role, which can improve the safety of the electric unit conductor in seawater.

[0012] As an improvement of the utility model, the outer layer of the aluminum alloy belt anti-tie layer is provided with a semi-conductive polypropylene sheath. Through the improvement, not only the structural stability of the aluminum alloy belt anti-tie layer is ensured, but also the weight is light.

[0013] As an improvement of the present invention, the electrical unit conductor is formed by twisting a water-blocking enameled wire copper core. Through the improvement, by coating the copper core with water-blocking paint, the electrical insulation performance of the copper core can be provided, which can significantly reduce the skin effect of large-section conductors, thereby effectively improving the current carrying capacity. Accordingly, under the condition of the same cross-sectional flow rate, the water-blocking enameled wire copper core requires a smaller cross-sectional area than a conventional copper core, which can reduce costs and weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model.

[0015] Figure 2 The utility model is a schematic diagram of the outer layer structure of the aluminum alloy electrical unit conductor.

[0016] As shown in the figure: 1. Armor layer, 2. Polypropylene rope outer sheath, 3. Polypropylene rope inner lining, 4. Electrical unit conductor, 5. Conductor shielding layer, 6. Insulation layer, 7. Insulation shielding layer, 8. Rubber-coated cloth tape, 9. Polypropylene filling strip, 9.1. Embedded groove, 9.2. Hollow cavity, 9.3. Radial support ribs, 9.4. Central support ribs, 10. Aluminum alloy wire shielding layer, 11. Aluminum alloy belt reverse tie layer, 12. Semiconducting resistance water tape, 13. Semiconducting polypropylene sheath, 14. Optical unit conductor. DETAILED DESCRIPTION

[0017] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, a lightweight submarine cable comprises a body, the outer ring of the body is provided with an armor layer 1, the armor layer 1 is woven by aluminum alloy wire coated with a semi-conductive film, the outer layer of the armor layer 1 is provided with a polypropylene rope outer sheath 2, the inner layer of the armor layer 1 is provided with a polypropylene rope lining 3, the inner ring of the body is provided with an electric unit conductor 4, the electric unit conductor 4 is wrapped with a conductor shielding layer 5, an insulating layer 6 and an insulating shielding layer 7 from the inside to the outside, the insulating layer 6 is extruded by polypropylene material, and the electric unit conductor 4 is twisted by a water-blocking enameled wire copper core.

[0019] Three electric unit conductors 4 are arranged in the body. The outer layers of the three electric unit conductors 4 are bound into a bundle with a circular cross section by a rubberized cloth tape 8. The gap between the two electric unit conductors 4 and the rubberized cloth tape 8 is filled by a polypropylene filling strip 9. Two optical unit conductors 14 are also arranged in the body. The polypropylene filling strip 9 is provided with an embedding groove 9.1 for installing the optical unit conductor 14. The embedding groove 9.1 is arranged at one end of the polypropylene filling strip 9 connected to the rubberized cloth tape 8. The embedding groove 9.1 is arranged on the symmetric plane of the polypropylene filling strip 9. There are three polypropylene filling strips 9 in the body, of which the embedding grooves 9.1 of two polypropylene filling strips 9 are used to embed the optical unit conductor 14, and the other embedding groove 9.1 is embedded with a bundle-shaped filling strip made of polypropylene material and having the same diameter as the optical unit conductor 14, so as to ensure the fullness of the body and the uniformity of the body mass distribution.

[0020] A hollow cavity 9.2 is provided inside the polypropylene filling strip 9, and radial support ribs 9.3 and central support ribs 9.4 are provided inside the hollow cavity 9.2. The radial support ribs 9.3 are arranged along the radial direction of the body, and the central support ribs 9.4 are arranged along the central connecting line between the electrical unit conductor 4 and the optical unit conductor 14.

[0021] like Figure 1 , Figure 2 As shown, the outer layer of the electrical unit conductor 4 is also provided with an aluminum alloy wire shielding layer 10 and an aluminum alloy tape reversed layer 11, the aluminum alloy wire shielding layer 10 is arranged on the outer layer of the insulating shielding layer 7, and a semiconductive resistance water tape 12 is arranged between the aluminum alloy wire shielding layer 10 and the insulating shielding layer 7, and the outer layer of the aluminum alloy tape reversed layer 11 is provided with a semiconductive polypropylene sheath 13.

[0022] From the perspective of cost, compared with traditional submarine cables, the lightweight submarine cable has a smaller cross-section of the electrical unit conductor 4 coated with water-blocking paint under the condition of the same current carrying capacity, which can reduce the cost of the electrical unit conductor 4 by about 10%; and polypropylene material is used in many places. The material is easy to process and its price is similar to that of polyethylene. In addition, because the design of the lead sheath structure is reduced, it is expected that the cost can be reduced by 20% for projects with the same working conditions and current carrying capacity requirements.

[0023] From the perspective of construction benefits, under the same current carrying capacity, the reduction in the volume of the electrical unit conductor 4, the conversion of the armor layer 1 from steel wire to aluminum alloy wire coated with a semi-conductive film, and the multiple applications of polypropylene materials are expected to reduce the weight by 40% in projects with the same working conditions and current carrying capacity requirements. In addition, the lightweight design has greatly improved the problem that the length of the original long submarine cable is limited by the load capacity of the construction ship, greatly increasing the continuous production and laying length of a single jointless submarine cable, greatly reducing the impact of the intermediate joint on the quality of the submarine cable, and the lightweight submarine cable is easier to lay, reducing the dependence on heavy equipment, laying faster, and having less impact on the environment.

[0024] The above description is only for the best embodiment of the utility model, but it cannot be understood as a limitation of the claims. The utility model is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the protection scope of the independent claims of the utility model are within the protection scope of the utility model.

Claims

1. A lightweight submarine cable, comprising a body, characterized in that: The outer ring of the main body is provided with an armor layer (1), the armor layer (1) is woven from aluminum alloy wire coated with a semi-conductive film, the outer layer of the armor layer (1) is provided with a polypropylene rope outer sheath (2), the inner layer of the armor layer (1) is provided with a polypropylene rope lining (3), the inner ring of the main body is provided with an electric unit conductor (4), the electric unit conductor (4) is wrapped from the inside to the outside with a conductor shielding layer (5), an insulating layer (6) and an insulating shielding layer (7), and the insulating layer (6) is extruded from a polypropylene material.

2. A lightweight submarine cable according to claim 1, characterized in that: The body is provided with a plurality of electric unit conductors (4), the outer layers of the plurality of electric unit conductors (4) are bound into a bundle with a circular cross-section by means of a rubberized cloth tape (8), and the gap between two of the electric unit conductors (4) and the rubberized cloth tape (8) is filled with a polypropylene filling strip (9).

3. A lightweight submarine cable according to claim 2, characterized in that: A plurality of optical unit conductors are also arranged in the body, and an embedding groove (9.1) for installing the optical unit conductor is provided on the polypropylene filling strip (9), and the embedding groove (9.1) is arranged at one end of the polypropylene filling strip (9) connected to the rubber-coated cloth strip (8).

4. A lightweight submarine cable according to claim 3, characterized in that: The embedding groove (9.1) is arranged on the symmetric surface of the polypropylene filling strip (9).

5. A lightweight submarine cable according to claim 4, characterized in that: The polypropylene filling strip (9) is provided with a hollow cavity (9.2) inside.

6. A lightweight submarine cable according to claim 5, characterized in that: The hollow cavity (9.2) is provided with radial support ribs (9.3) and central support ribs (9.4), the radial support ribs (9.3) being arranged along the radial direction of the body, and the central support ribs (9.4) being arranged along the central connection line between the electric unit conductor (4) and the optical unit conductor.

7. A lightweight submarine cable according to claim 2, characterized in that: The outer layer of the electric unit conductor (4) is also provided with an aluminum alloy wire shielding layer (10) and an aluminum alloy tape reverse-twisting layer (11); the aluminum alloy wire shielding layer (10) is provided on the outer layer of the insulating shielding layer (7); and a semiconducting water-resistant tape (12) is provided between the aluminum alloy wire shielding layer (10) and the insulating shielding layer (7).

8. A lightweight submarine cable according to claim 7, characterized in that: The outer layer of the aluminum alloy belt reverse tie layer (11) is provided with a semi-conductive polypropylene sheath (13).

9. A lightweight submarine cable according to claim 1, characterized in that: The electrical unit conductor (4) is formed by twisting a water-blocking enameled copper wire core.

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