High-strength medium-voltage power transmission cable

Abstract

The utility model discloses a high-strength medium-voltage power transmission cable, and relates to the field of cables, the high-strength medium-voltage power transmission cable comprises a cable body and an outer sheath, the cable body comprises a conductor, the outer side of the conductor is provided with a conductor shielding layer, the middle part of the inner side of the cable body is provided with a reinforcing member, and the side surface of the reinforcing member is provided with an arc-shaped groove. The lower arc of the conductor shielding layer is matched with the inner side of the arc-shaped groove, the conductor shielding layer is located in the arc-shaped groove, and a buffer cavity is formed in the middle of the reinforcing piece. When the outside of the cable body is extruded, the conductor shielding layer applies force to the reinforcer, the final stressed part is the reinforcer, the conductor shielding layer and the conductor can be protected, the overall strength is improved, the middle part of the reinforcer is provided with the buffer cavity, the reinforcer deforms when being stressed, the buffer cavity can provide a good deformation space, and the overall strength is improved. And the overall strength is improved.

Description

Technical Field

[0001] This application relates to the field of cables, and more particularly to a high-strength medium-voltage transmission cable. Background Technology

[0002] With the development of technology, there are more and more types of cables on the market. Because the application environment of cables is relatively harsh, they need to have characteristics such as high tensile strength, torsional strength, high mechanical stress resistance, waterproof, oil-proof, UV protection, flame retardancy, chemical corrosion resistance, and high temperature resistance. However, the cables on the market at present cannot fully meet the above requirements, especially in terms of cable strength and fire resistance, which are slightly insufficient. Therefore, there is an urgent need for improvement.

[0003] For example, patent document CN215265676U discloses a high-strength fire-resistant special cable, including a conductor, an insulation layer wrapped around the conductor, a filler filling the insulation layer, a first sealing layer wrapped around the filler, a perforated support frame outside the first sealing layer, a second sealing layer wrapped around the support frame, and a metal mesh outside the second sealing layer. However, this prior art still has some drawbacks, such as: the overall strength of the cable needs to be further improved, and the direct contact between the conductors inside the cable can easily cause wear, reducing the strength of the cable and affecting its service life. Utility Model Content

[0004] To address the problem of wear and tear caused by direct contact between conductors inside the cable, which reduces the cable's strength, this application provides a high-strength medium-voltage transmission cable.

[0005] This application provides a high-strength medium-voltage power transmission cable with the following technical solution:

[0006] The cable includes a cable body and an outer sheath. The cable body includes a conductor, and a conductor shielding layer is provided on the outer side of the conductor. A reinforcing member is installed in the middle of the inner side of the cable body. An arc-shaped groove is formed on the side of the reinforcing member. The lower arc shape of the conductor shielding layer matches the inner side of the arc-shaped groove, and the conductor shielding layer is located inside the arc-shaped groove. A buffer cavity is formed in the middle of the reinforcing member.

[0007] By adopting the above technical solution, when the cable body is squeezed externally, the conductor shielding layer will exert force on the reinforcing member. The final stressed component is the reinforcing member, which can protect the conductor shielding layer and the conductor, and improve the overall strength. A buffer cavity is opened in the middle of the reinforcing member. When the reinforcing member is stressed, it will deform. The buffer cavity can provide good deformation space.

[0008] Preferably, an insulating shielding layer is provided on the outer side of the conductor shielding layer, and the gap between the inner side of the insulating shielding layer and the conductor shielding layer is filled with an insulator.

[0009] By adopting the above technical solution, the main function of the insulation layer is to prevent electrical energy from being lost from the cable, ensure the efficiency and stability of power transmission, effectively prevent external electric field interference to the cable, and ensure the quality and stability of power transmission.

[0010] Preferably, an isolation sleeve is provided on the outside of the insulating shielding layer, and a metal shielding layer is provided between the isolation sleeve and the insulating shielding layer.

[0011] By adopting the above technical solutions, the metal shielding layer can effectively shield external electromagnetic interference, ensure stable signal transmission, and prevent electromagnetic leakage of the cable.

[0012] Preferably, the outer side of the isolation sleeve is provided with a halogen-free low-smoke glass fiber strip, a cavity is provided between the halogen-free low-smoke glass fiber strip and the outer sheath, and an armor layer is provided inside the cavity, the armor layer being made of aluminum wire.

[0013] By adopting the above technical solution, the mechanical strength of the cable body can be significantly improved through the aluminum wire armor layer, enabling it to withstand greater tensile, compressive, and lateral pressure.

[0014] Preferably, the conductor is made of copper, the conductor shielding layer is made of semi-conductive polyolefin, and the outer sheath is made of halogen-free, low-smoke, flame-retardant polyolefin.

[0015] By adopting the above technical solution, the outer layer of the low-smoke halogen-free flame-retardant polyolefin cable is made of special materials, which has strong wear resistance and can effectively resist various mechanical damage and chemical corrosion.

[0016] Preferably, the insulator is made of cross-linked polyethylene, and the insulating shielding layer is made of semi-conductive polyolefin.

[0017] By adopting the above technical solution, the semiconductive shielding layer can eliminate the air gap between the insulating layer and the metal shielding layer, making the electric field distribution more uniform and avoiding partial discharge caused by excessive local electric field intensity.

[0018] Preferably, the isolation sleeve is made of polyethylene, and the metal shielding layer is made of loosely wound copper wire.

[0019] By adopting the above technical solution, the copper wire sparse winding shielding has a high density, which can effectively absorb and isolate electromagnetic waves and has excellent anti-interference performance.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] In this application, when the cable body is compressed on the outside, the conductor shielding layer will exert force on the reinforcing member. The final stressed component is the reinforcing member, which can protect the conductor shielding layer and the conductor, and improve the overall strength. A buffer cavity is provided in the middle of the reinforcing member. When the reinforcing member is stressed, it will deform. The buffer cavity can provide good deformation space and improve the overall strength. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall cross-sectional structure of a high-strength medium-voltage power transmission cable according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram illustrating the overall external structure of the embodiments of this application;

[0024] Figure 3 This is a schematic diagram illustrating the main inner structure of the embodiments of this application;

[0025] Figure 4 This is a schematic diagram illustrating the enlarged structure of part A, which is the main embodiment of this application.

[0026] Reference numerals: 1. Conductor; 2. Conductor shielding layer; 3. Insulator; 4. Insulating shielding layer; 5. Metallic shielding layer; 6. Isolation sleeve; 7. Halogen-free low-smoke fiberglass tape; 8. Armoring layer; 9. Outer sheath; 10. Reinforcing member; 11. Arc groove; 12. Buffer cavity; 13. Cable body; 14. Cavity. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0028] This application discloses a high-strength medium-voltage power transmission cable. Please refer to... Figure 3 and Figure 4The cable includes a cable body 13 and an outer sheath 9. The cable body 13 includes a conductor 1, with a conductor shielding layer 2 on the outer side of the conductor 1. A reinforcing member 10 is installed in the middle of the inner side of the cable body 13. An arc-shaped groove 11 is formed on the side of the reinforcing member 10. The lower arc shape of the conductor shielding layer 2 matches the inner side of the arc-shaped groove 11, and the conductor shielding layer 2 is located inside the arc-shaped groove 11. When the cable body 13 is compressed from the outside, the conductor shielding layer 2 will exert force on the reinforcing member 10. The final stress-bearing component is the reinforcing member 10, which can protect the conductor shielding layer 2 and the conductor 1, and improve the overall strength. A buffer is formed in the middle of the reinforcing member 10. The cavity 12 and the reinforcing member 10 will deform under stress. The buffer cavity 12 can provide good deformation space. The conductor 1 is made of copper, and the conductor shielding layer 2 is made of semi-conductive polyolefin. The semi-conductive shielding layer can eliminate the air gap between the insulation layer and the metal shielding layer 5, making the electric field distribution more uniform, avoiding the partial discharge phenomenon caused by excessive local electric field strength, and improving the insulation level of the cable body 13. The outer sheath 9 is made of halogen-free low-smoke flame-retardant polyolefin. The outer layer of the low-smoke halogen-free flame-retardant polyolefin cable is made of special materials, which has strong wear resistance and can effectively resist various mechanical damage and chemical corrosion.

[0029] Please refer to Figures 1 to 3 An insulating shielding layer 4 is provided on the outside of the conductor shielding layer 2. The gap between the inner side of the insulating shielding layer 4 and the conductor shielding layer 2 is filled by an insulator 3. The insulator 3 is made of cross-linked polyethylene, and the insulating shielding layer 4 is made of semi-conductive polyolefin. The semi-conductive shielding layer can eliminate the air gap between the insulating layer and the metal shielding layer 5, making the electric field distribution more uniform and avoiding partial discharge caused by excessive local electric field strength. This is especially important for cables because partial discharge can cause electrical treeing, which can lead to insulation breakdown. The semi-conductive polyolefin can improve the overall safety.

[0030] Please refer to Figure 1 and Figure 2 An isolation sleeve 6 is provided on the outside of the insulating shielding layer 4, and a metal shielding layer 5 is provided between the isolation sleeve 6 and the insulating shielding layer 4. The isolation sleeve 6 is made of polyethylene, and the metal shielding layer 5 is made of loosely wound copper wire. The high density of the loosely wound copper wire shielding can effectively absorb and isolate electromagnetic waves, and has excellent anti-interference performance. When electronic equipment operates at high speed, it will generate strong electromagnetic interference. Using loosely wound copper wire shielding can avoid the impact of this interference on the equipment. At the same time, it can also prevent crosstalk caused by incoming and outgoing signal lines, ensuring the stability of the equipment signal.

[0031] Please refer to Figure 1The outer side of the isolation sleeve 6 is provided with a halogen-free low-smoke glass fiber tape 7. A cavity 14 is provided between the halogen-free low-smoke glass fiber tape 7 and the outer sheath 9. An armor layer 8 is provided inside the cavity 14. The armor layer 8 is made of aluminum wire. The aluminum wire armor layer 8 can significantly improve the mechanical strength of the cable body 13, enabling it to withstand greater tensile, compressive and lateral pressure. During the laying process, even if it encounters harsh terrain and conditions, the armored cable can maintain the integrity and stability of the structure.

[0032] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-strength medium-voltage power transmission cable, characterized in that: The cable includes a cable body (13) and an outer sheath (9). The cable body (13) includes a conductor (1). A conductor shielding layer (2) is provided on the outer side of the conductor (1). A reinforcing member (10) is installed in the middle of the inner side of the cable body (13). An arc groove (11) is provided on the side of the reinforcing member (10). The lower arc of the conductor shielding layer (2) is adapted to the inner side of the arc groove (11), and the conductor shielding layer (2) is located inside the arc groove (11). A buffer cavity (12) is provided in the middle of the reinforcing member (10).

2. The high-strength medium-voltage transmission cable according to claim 1, characterized in that: An insulating shielding layer (4) is provided on the outside of the conductor shielding layer (2), and the gap between the inner side of the insulating shielding layer (4) and the conductor shielding layer (2) is filled by an insulator (3).

3. A high-strength medium-voltage transmission cable according to claim 2, characterized in that: An isolation sleeve (6) is provided on the outside of the insulating shielding layer (4), and a metal shielding layer (5) is provided between the isolation sleeve (6) and the insulating shielding layer (4).

4. A high-strength medium-voltage transmission cable according to claim 3, characterized in that: The outer side of the isolation sleeve (6) is provided with a halogen-free low-smoke glass fiber strip (7), and a cavity (14) is provided between the halogen-free low-smoke glass fiber strip (7) and the outer sheath (9). An armor layer (8) is provided inside the cavity (14), and the armor layer (8) is made of aluminum wire.

5. A high-strength medium-voltage transmission cable according to claim 1, characterized in that: The conductor (1) is made of copper, the conductor shielding layer (2) is made of semi-conductive polyolefin, and the outer sheath (9) is made of halogen-free low-smoke flame-retardant polyolefin.

6. A high-strength medium-voltage transmission cable according to claim 2, characterized in that: The insulator (3) is made of cross-linked polyethylene, and the insulating shielding layer (4) is made of semi-conductive polyolefin.

7. A high-strength medium-voltage transmission cable according to claim 3, characterized in that: The isolation sleeve (6) is made of polyethylene, and the metal shielding layer (5) is made of loosely wound copper wire.

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