Metal sheathed high voltage dynamic submarine cable and its forming process

Abstract

The application discloses a kind of metal sheath high-pressure dynamic submarine cable, body includes multiple electric unit core wires, the outer layer of electric unit core wire is equipped with insulating layer, pitch layer and aluminum metal sheath, aluminum metal sheath is corrugated, the outer layer of body is equipped with cable sheath layer and armoring layer;The application also discloses a kind of metal sheath high-pressure dynamic submarine cable forming process, its steps are as follows, multiple conductors are twisted into water-blocking conductor;Extrusion insulating layer;Pitch layer is sprayed;Wrap aluminum metal sheath;Aluminum metal sheath is rolled into corrugated shape;PE filling material is taken and is extruded into shape, and cable sheath layer is formed;Armoring layer forming is carried out.The application provides a kind of metal sheath high-pressure dynamic submarine cable and its forming process, which strengthens electric unit core wire in dynamic submarine cable, reduces the strengthening structure of outer layer of dynamic submarine cable, to reduce the diameter of dynamic submarine cable after strengthening and increase the bending resistance of dynamic submarine cable.

Description

Technical Field

[0001] This invention relates to the field of dynamic submarine cables, specifically a metal-sheathed high-voltage dynamic submarine cable and its forming process. Background Technology

[0002] With the increasing efforts in offshore oil and gas exploration, the demand for dynamic submarine cables in major oil and gas fields is growing. At the same time, the environment in which dynamic submarine cables are used is becoming more complex, which leads to increasingly higher requirements for their use.

[0003] Traditional dynamic submarine cables are designed by optimizing the outer sheath and armor layers to enhance their strength and protect the internal electrical core structure. This results in a larger overall diameter and a larger minimum bending radius, making installation more difficult. Furthermore, with the same reinforcement layer thickness, the increased diameter of the dynamic submarine cable weakens its bending resistance, which is not conducive to the widespread use of dynamic submarine cables. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a metal-sheathed high-voltage dynamic submarine cable and its forming process, which strengthens the core wires of the electrical unit in the dynamic submarine cable, reduces the strengthening structure of the outer layer of the dynamic submarine cable, thereby reducing the diameter of the dynamic submarine cable after strengthening and increasing the bending resistance of the dynamic submarine cable.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: a metal-sheathed high-voltage dynamic submarine cable, comprising a body, the body comprising multiple electrical unit core wires, the outer layer of the electrical unit core wires being provided with an insulation layer, an asphalt layer and an aluminum metal sheath from the inside out, the aluminum metal sheath being corrugated, the asphalt layer filling the space between the aluminum metal sheath and the insulation layer, the outer layer of the body being provided with a cable sheath layer and an armor layer, the cable sheath layer being disposed on the inner side of the armor layer.

[0006] Compared with existing technologies, the advantages of this invention are as follows: The aluminum metal sheath is corrugated, making it more suitable for the operating environment of dynamic submarine cables, with stronger bending resistance and greater adaptability to dynamic environments. It also allows the cable to withstand higher short-circuit currents, enabling the dynamic submarine cable to meet high-voltage cable requirements. Furthermore, an asphalt layer is added to the inner layer of the aluminum metal sheath. After the asphalt layer solidifies, it strengthens the structural strength of the aluminum metal sheath, preventing the corrugated structure from crushing and deforming during use. The asphalt also lubricates the aluminum metal sheath, further enhancing its suitability for dynamic environments. At this point, the electrical unit core wires are already protected by the asphalt layer and the aluminum metal sheath, eliminating the need for the traditional outer asphalt layer of dynamic submarine cables. This also allows for a reduction in the thickness or winding density of the armor layer, thereby reducing the diameter of the dynamic submarine cable and enabling it to have a smaller minimum bending radius, thus broadening its application range.

[0007] As an improvement of the present invention, a water-blocking conductor is provided on the inner side of the insulation layer. The water-blocking conductor includes multiple stranded conductors, and a water-blocking strip is provided between the multiple conductors. With this improvement, when no water seeps in, the water-blocking strip is in a normal state. When water seeps in, the water-blocking strip can absorb water and expand, thereby isolating the conductor from the outside world, ensuring that the conductor will not come into contact with water, and ensuring the normal operation of the dynamic submarine cable.

[0008] As an improvement of the present invention, the armor layer is formed by wrapping armor steel wires through an extruded PE sheath process. Through this improvement, the design of the outer sheath of the armor layer can be reduced. Compared with the traditional design of combining the armor layer and the outer sheath, the outer diameter of the body can be reduced and the body can have a smaller bending radius, making the application environment of the dynamic submarine cable wider.

[0009] The technical solution adopted by this invention to solve the above problems is as follows: a metal-sheathed high-voltage dynamic submarine cable forming process, used to form a metal-sheathed high-voltage dynamic submarine cable, the steps of which are as follows. S1: A water-blocking strip is placed between multiple conductors to twist them into a water-blocking conductor; S2: Extruded insulating layer on the outer layer of the water-blocking conductor; S3: Spray an asphalt layer on the outer layer of the insulation layer; S4: Wrap an aluminum metal sheath around the outer layer of the asphalt layer, and weld the joints of the aluminum metal sheath. S5: Polish the surface of the joint and roll the aluminum metal sheath into a corrugated shape using a rolling mill to complete the forming of a single electrical unit core wire; S6: Take multiple water-blocking conductors and PE filler, extrude them, and form a cable sheath layer on the outer layer. S7: After the PE sheath 6.2 is extruded on the outer layer of the armored steel wire 6.1, the armor layer is formed on the outer layer of the cable sheath.

[0010] Compared with existing technologies, the advantages of this invention are as follows: The water-blocking strip design effectively ensures the safety of the dynamic submarine cable on the seabed. The corrugated aluminum sheath makes it more suitable for the operating environment of the dynamic submarine cable, providing stronger bending resistance and adaptability to dynamic environments. It also allows the cable to withstand higher short-circuit currents, enabling the dynamic submarine cable to meet high-voltage cable requirements. Furthermore, an asphalt layer is added to the inner layer of the aluminum sheath. After the asphalt layer solidifies, it strengthens the structural strength of the aluminum sheath, preventing the corrugated structure from crushing and deforming during use. The asphalt also lubricates the aluminum sheath, further enhancing its suitability for dynamic environments. With the electrical unit core wire protected by the asphalt layer and aluminum sheath, the asphalt layer on the outer layer of traditional dynamic submarine cables can be eliminated. This also allows for a reduction in the thickness or winding density of the armor layer, thereby reducing the diameter of the dynamic submarine cable and enabling it to have a smaller minimum bending radius, thus broadening its application range.

[0011] As an improvement of the present invention, in step S3, the asphalt layer is sprayed simultaneously and under the same pressure through multiple nozzles to ensure the uniformity of the asphalt layer spraying. Through the improvement, the uniformity of the asphalt layer is ensured. When the aluminum metal sheath is corrugated, the asphalt layer can be fully filled inside the aluminum metal sheath, thereby ensuring the uniformity of the strength of the aluminum metal sheath and avoiding local crushing of the aluminum metal sheath.

[0012] As an improvement of the present invention, a plurality of spray holes are disposed on the inner side of a spraying ring. The spraying ring has a storage chamber, one end of which has a feed inlet. A control ring is rotatably connected within the storage chamber along the center of the spraying ring. The control ring has a switch hole. Normally, the switch hole and the spray hole are misaligned. When the switch hole and the spray hole correspond one-to-one, asphalt is sprayed from the storage chamber outwards. A pressure spring is provided at the end of the control ring near the feed inlet. When the asphalt in the storage chamber reaches a specified pressure, the control ring compresses. The pressure spring controls the movement of the control ring towards the pressure spring, aligning the switch hole with the spray hole. This improvement allows for the storage of asphalt in the storage chamber, providing a buffer before spraying. After the storage chamber is full, the high pressure from the continued filling compresses the control ring, aligning the switch hole with the spray hole and forming a complete spray channel. Simultaneously, the pressure within the entire storage chamber is uniform, ensuring consistent pressure across all spray holes during spraying and guaranteeing uniform asphalt spraying.

[0013] As an improvement of the present invention, the storage chamber is provided with a moving chamber for controlling the movement of the ring plate. One end of the moving chamber is used to install a pressure spring, and the end of the moving chamber away from the pressure spring is sealed and movable. Through this improvement, the design of the moving chamber ensures the stability of the movement of the control ring plate and avoids the asphalt from affecting the structure inside the moving chamber.

[0014] As an improvement of the present invention, a discharge hole is provided at the end of the storage chamber away from the feed hole. The discharge hole is located on the side of the moving chamber away from the pressure spring. With this improvement, when the asphalt spraying work is completed, the asphalt in the storage chamber needs to be discharged from the storage chamber with clean water in time to avoid the asphalt from solidifying in the storage chamber, which would affect the subsequent use of the storage chamber. Most of the asphalt can be discharged from the spray hole, but a small amount of asphalt in contact with the control ring cannot be discharged from the spray hole due to the lack of flow space. A discharge hole needs to be specially set up for discharge.

[0015] As an improvement of the present invention, a conical cylinder is provided at the end of the spraying ring near the station for wrapping the aluminum metal sheath. The diameter of the conical cylinder decreases from the spraying ring toward the station for wrapping the aluminum metal sheath. The water-blocking conductor for spraying asphalt moves along the axial direction of the conical cylinder. Multiple dispersed stripes are arranged along the inclined sidewall of the conical cylinder. The dispersed stripes are multi-layered, with adjacent layers of dispersed stripes staggered. As the diameter of the conical cylinder decreases, the thickness of the dispersed stripes decreases. The inner wall of the smallest diameter end of the conical cylinder is smooth. When the asphalt passes through the conical cylinder, a uniformly distributed asphalt layer is formed. Through this improvement, because the fluid asphalt cannot naturally and uniformly distribute on the surface of the insulation layer when sprayed from the spraying ring, it is possible to achieve the desired effect. The subsequent uniform wrapping of the aluminum metal sheath is more challenging. Therefore, it is necessary to ensure that the asphalt is evenly distributed on the surface of the insulation layer before proceeding with subsequent processes to achieve a higher quality dynamic submarine cable. The conical tube design allows the asphalt to shrink and compact, expelling air from the asphalt and ensuring its density. It also ensures that the asphalt forms a uniformly distributed asphalt layer as it passes through the conical tube. The dispersion stripe design allows the asphalt to disperse rapidly within the conical tube. Fluid asphalt is difficult to compress and shrink during the compression process. The dispersion stripe can disrupt the surface tension structure of the asphalt, reducing the difficulty of shrinkage. Furthermore, since the asphalt is only discharged from a few nozzles and its circumferential distribution is uneven, the dispersion stripe can fully disperse the asphalt to achieve a uniform distribution.

[0016] As an improvement of the present invention, the station for wrapping the aluminum metal sheath is connected to the asphalt layer spraying station. Through this improvement, the asphalt sprayed on the surface of the insulation layer can be quickly coated, avoiding the asphalt from flowing downward due to gravity, thus preventing uneven asphalt distribution. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the metal-sheathed high-voltage dynamic submarine cable of the present invention.

[0018] Figure 2 This is a schematic cross-sectional view of the core wire of the electrical unit of the present invention.

[0019] Figure 3 This is an enlarged structural schematic diagram of the armor layer of the present invention.

[0020] Figure 4 This is a schematic diagram of the spraying ring structure of the present invention.

[0021] Figure 5 This is a schematic diagram of the unfolded conical cylinder structure of the present invention.

[0022] Figure 6 This is a schematic diagram of the local magnified distribution structure of the dispersed stripes of the present invention.

[0023] Figure 7 This is a schematic diagram of the thickness distribution structure of the dispersed stripes in this invention.

[0024] The diagram shows: 1. Electrical unit core wire, 1.1. Conductor, 1.2. Water-blocking tape, 2. Insulation layer, 3. Asphalt layer, 4. Aluminum metal sheath, 5. Cable sheath layer, 6. Armor layer, 6.1. Armored steel wire, 6.2. PE sheath, 7. PE filler, 8. Spraying ring, 8.1. Storage chamber, 8.2. Feed hole, 8.3. Control ring plate, 8.3.1. Switch hole, 8.4. Pressure spring, 8.5. Moving chamber, 8.6. Discharge hole, 8.7. Spray hole, 9. Conical cylinder, 9.1. Dispersed stripes. Detailed Implementation

[0025] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1-3 As shown, a metal-sheathed high-voltage dynamic submarine cable includes a body, which comprises multiple electrical unit core wires 1. The outer layer of each electrical unit core wire 1 is provided with an insulation layer 2, an asphalt layer 3, and an aluminum metal sheath 4 from the inside out. The aluminum metal sheath 4 is corrugated. The asphalt layer 3 fills the space between the aluminum metal sheath 4 and the insulation layer 2. The outer layer of the body is provided with a cable sheath layer 5 and an armor layer 6. The cable sheath layer 5 is located inside the armor layer 6. The inner side of the insulation layer 2 is provided with a water-blocking conductor. The water-blocking conductor comprises multiple stranded conductors 1.1. A water-blocking tape 1.2 is provided between the multiple conductors 1.1. The armor layer 6 is formed by wrapping armor steel wires 6.1 that have undergone the PE sheath 6.2 extrusion process.

[0027] A molding process for a metal-sheathed high-voltage dynamic submarine cable, the steps of which are as follows: S1: A water-blocking strip 1.2 is placed between multiple conductors 1.1, and the multiple conductors 1.1 are twisted together to form a water-blocking conductor; S2: Extruded insulating layer 2 on the outer layer of the water-blocking conductor; S3: Spray asphalt layer 3 on the outer layer of insulation layer 2; S4: Wrap an aluminum metal sheath 4 around the outer layer of the asphalt layer 3, and weld the joint of the aluminum metal sheath 4. S5: Polish the surface of the joint and roll the aluminum metal sheath 4 into a corrugated shape using a rolling mill to complete the forming of the single electrical unit core wire 1; S6: Take multiple water-blocking conductors and PE filler 7 for extrusion molding, and form a cable sheath layer 5 on its outer layer. S7: After the PE sheath 6.2 is extruded on the outer layer of the armored steel wire 6.1, the armor layer 6 is formed on the outer layer of the cable sheath layer 5.

[0028] In step S2, the insulating layer 2 has three layers, and the three insulating layers 2 are extruded simultaneously, including an insulating shielding layer.

[0029] like Figure 4 As shown, in step S3, the asphalt layer 3 is sprayed simultaneously and under the same pressure through multiple nozzles 8.7 to ensure the uniformity of the asphalt layer 3 spraying. The multiple nozzles 8.7 are located inside a spraying ring 8. The spraying ring 8 has a storage chamber 8.1 inside, and a feed hole 8.2 is provided at one end of the storage chamber 8.1. A control ring plate 8.3 is rotatably connected to the storage chamber 8.1 along the center of the spraying ring 8. The control ring plate 8.3 has a switch hole 8.3.1. Normally, the switch hole 8.3.1 is staggered with the nozzles 8.7. When the switch hole 8.3.1 corresponds one-to-one with the nozzles 8.7, asphalt is sprayed outward from the storage chamber 8.1. A pressure spring 8 is provided at the end of the control ring plate 8.3 near the feed hole 8.2. 4. When the asphalt material in the storage chamber 8.1 reaches the specified pressure, the control ring 8.3 compresses the pressure spring 8.4, causing the control ring 8.3 to move towards the pressure spring 8.4 and aligning the switch hole 8.3.1 with the spray hole 8.7. The storage chamber 8.1 has a moving chamber 8.5 for the movement of the control ring 8.3. One end of the moving chamber 8.5 is used to mount the pressure spring 8.4, and the end of the moving chamber 8.5 away from the pressure spring 8.4 is in a sealed moving configuration. The end of the storage chamber 8.1 away from the feed hole 8.2 has a discharge hole 8.6, located on the side of the moving chamber 8.5 away from the pressure spring 8.4. During asphalt spraying, the discharge hole 8.6 is in a closed state. After the asphalt spraying is completed, the pressure spring 8.4 resets, and the switch hole 8.3.1 and spray hole 8.7 are restored to their misaligned configuration.

[0030] like Figure 4-7 As shown, a conical cylinder 9 is provided at the end of the spraying ring 8 near the station for wrapping the aluminum metal sheath 4. The diameter of the conical cylinder 9 decreases from the spraying ring 8 towards the station for wrapping the aluminum metal sheath 4. The water-blocking conductor for spraying asphalt moves along the axial direction of the conical cylinder 9. The conical cylinder 9 has multiple dispersed stripes 9.1 arranged along the inclined surface of the side wall. The dispersed stripes 9.1 are multi-layered, and the dispersed stripes 9.1 on adjacent layers are staggered. As the diameter of the conical cylinder 9 decreases, the thickness of the dispersed stripes 9.1 decreases. The inner wall of the end with the smallest diameter of the conical cylinder 9 is smooth, forming a uniformly distributed asphalt layer 3 when the asphalt passes through the conical cylinder 9. The design of the conical cylinder 9 makes the distribution of the asphalt layer 3 more uniform, making it easier to achieve high-quality processing results in the subsequent wrapping of the aluminum metal sheath 4 and rolling into a corrugated shape.

[0031] The station for wrapping the aluminum metal sheath 4 is connected to the station for spraying the asphalt layer 3.

[0032] Through the design of this invention, the aluminum metal sheath 4 is corrugated, making it more suitable for the use environment of dynamic submarine cables, with stronger bending resistance and greater adaptability to dynamic environments. It can also enable the cable to withstand higher short-circuit currents, allowing the dynamic submarine cable to meet the requirements of high-voltage cables. Then, an asphalt layer 3 is added to the inner layer of the aluminum metal sheath 4. After the asphalt layer 3 solidifies, it can strengthen the structural strength of the aluminum metal sheath 4, preventing the corrugated structure of the aluminum metal sheath 4 from being crushed and deformed during use. The asphalt can also lubricate the aluminum metal sheath 4, making the aluminum metal sheath 4 more suitable for dynamic environments. At this time, the electrical unit core wire 1 is already protected by the asphalt layer 3 and the aluminum metal sheath 4, while the asphalt layer 3 of the traditional outer layer of dynamic submarine cables can be eliminated. The thickness or winding density of the armor layer 6 can also be reduced, thereby reducing the diameter of the dynamic submarine cable and enabling the dynamic submarine cable to have a smaller minimum bending radius. At the same time, the armor layer 6 formed by the extrusion PE sheath 6.2 process can also enable the dynamic submarine cable to have a smaller minimum bending radius. With dual optimization, the application environment of the dynamic submarine cable is broadened.

[0033] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A metal-sheathed high-voltage dynamic submarine cable, comprising a body, characterized in that: The main body includes multiple electrical unit core wires (1). The outer layer of the electrical unit core wires (1) is provided with an insulation layer (2), an asphalt layer (3) and an aluminum metal sheath (4) from the inside out. The aluminum metal sheath (4) is corrugated. The asphalt layer (3) fills the space between the aluminum metal sheath (4) and the insulation layer (2). The outer layer of the main body is provided with a cable sheath layer (5) and an armor layer (6). The cable sheath layer (5) is located inside the armor layer (6). The inner side of the insulation layer (2) is provided with a water-blocking conductor. The water-blocking conductor includes multiple stranded conductors (1.1). A water-blocking strip (1.2) is provided between the multiple conductors (1.1).

2. The high-voltage dynamic submarine cable with a metal sheath according to claim 1, characterized in that: The armor layer (6) is formed by wrapping armor steel wire (6.1) through the extrusion PE sheath (6.2) process.

3. A forming process for a metal-sheathed high-voltage dynamic submarine cable, characterized in that, The steps for forming a metal-sheathed high-voltage dynamic submarine cable according to any one of claims 1-2 are as follows: S1: A water-blocking strip (1.2) is placed between multiple conductors (1.1), and the multiple conductors (1.1) are twisted together to form a water-blocking conductor; S2: Extruded insulating layer (2) on the outer layer of the water-blocking conductor; S3: Spray an asphalt layer (3) on the outer layer of the insulation layer (2); S4: Wrap an aluminum metal sheath (4) around the outer layer of the asphalt layer (3) and weld the joint of the aluminum metal sheath (4); S5: Polish the surface of the joint and roll the aluminum metal sheath (4) into a corrugated shape using a rolling mill to complete the forming of a single electrical unit core wire (1); S6: Take multiple water-blocking conductors and PE filler (7) for extrusion molding, and form a cable sheath layer (5) on its outer layer. S7: After the PE sheath (6.2) is extruded on the outer layer of the armored steel wire (6.1), the armor layer (6) is formed on the outer layer of the cable sheath layer (5).

4. The metal-sheathed high-voltage dynamic submarine cable forming process according to claim 3, characterized in that: In step S3, the asphalt layer (3) is sprayed simultaneously and under the same pressure through multiple nozzles (8.7) to ensure the uniformity of the asphalt layer (3) spraying.

5. The metal-sheathed high-voltage dynamic submarine cable forming process according to claim 4, characterized in that: Multiple spray holes (8.7) are located inside a spraying ring (8). The spraying ring (8) has a material storage chamber (8.1) with a feed hole (8.2) at one end. A control ring (8.3) is rotatably connected to the material storage chamber (8.1) along the center of the spraying ring (8). The control ring (8.3) has a switch hole (8.3.1). Normally, the switch hole (8.3.1) is misaligned with the spray holes (8.7). When the switch hole (8.7) is turned off, the switch hole (8.3.1) is turned off. 3.1) When the spray hole (8.7) corresponds one-to-one with the spray hole (8.7), the asphalt is sprayed from the inside of the storage chamber (8.1) to the outside. The control ring (8.3) is provided with a pressure spring (8.4) at one end near the feed hole (8.2). When the asphalt in the storage chamber (8.1) reaches the specified pressure, the control ring (8.3) compresses the pressure spring (8.4), the control ring (8.3) moves towards the pressure spring (8.4), and the switch hole (8.3.1) is set to correspond with the spray hole (8.7).

6. The metal-sheathed high-voltage dynamic submarine cable forming process according to claim 5, characterized in that: The storage chamber (8.1) is provided with a movable chamber (8.5) for moving the control ring (8.3). One end of the movable chamber (8.5) is used to install a pressure spring (8.4), and the end of the movable chamber (8.5) away from the pressure spring (8.4) is in a sealed movable configuration.

7. The metal-sheathed high-voltage dynamic submarine cable forming process according to claim 6, characterized in that: The storage chamber (8.1) is provided with a discharge hole (8.6) at one end away from the feed hole (8.2), and the discharge hole (8.6) is located on the side of the moving chamber (8.5) away from the pressure spring (8.4).

8. The metal-sheathed high-voltage dynamic submarine cable forming process according to claim 5, characterized in that: The spraying ring (8) has a conical cylinder (9) at one end near the station for wrapping the aluminum metal sheath (4). The diameter of the conical cylinder (9) decreases from the spraying ring (8) toward the station for wrapping the aluminum metal sheath (4). The water-blocking conductor for spraying asphalt moves along the axis of the conical cylinder (9). The conical cylinder (9) has multiple dispersed stripes (9.1) arranged along the inclined surface of the side wall. The dispersed stripes (9.1) have multiple layers. The dispersed stripes (9.1) on adjacent layers are staggered. As the diameter of the conical cylinder (9) decreases, the thickness of the dispersed stripes (9.1) decreases. The inner wall of the end with the smallest diameter of the conical cylinder (9) is smooth. When the asphalt passes through the conical cylinder (9), a uniformly distributed asphalt layer (3) is formed.

9. The metal-sheathed high-voltage dynamic submarine cable forming process according to claim 3, characterized in that: The station for wrapping the aluminum metal sheath (4) is connected to the station for spraying the asphalt layer (3).

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