Composite high voltage cable

Abstract

The application discloses a composite high-voltage cable and relates to the technical field of power cables, which comprises a cable body, a ring belt arranged on the cable body, an outer sheath, an inner sheath arranged on the inner side of the outer sheath, an isolation layer arranged on the inner side of the inner sheath, a plurality of conductors arranged in the isolation layer, a wrapping layer arranged on the outer side of the conductors, a limiting piece arranged in the isolation layer, the limiting piece being used for fixing the conductors, a heat dissipation cavity formed between the limiting piece and the conductors, a plurality of buffer strips arranged between the isolation layer and the inner sheath, a buffer cavity formed between two adjacent buffer strips, the heat dissipation cavity being communicated with the buffer cavity, and a plurality of exhaust pipes circumferentially arranged on the ring belt and communicated with the buffer cavity. The heat dissipation cavity is communicated with the buffer cavity to form a heat dissipation channel, the overall heat dissipation efficiency of the cable is improved, the buffer strips and the buffer cavity are used for absorbing mechanical impact in cooperation, the anti-vibration capability is enhanced, the limiting piece is used for fixing the conductors to prevent displacement, and the electrical stability is ensured.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and in particular to a composite high-voltage cable. Background Technology

[0002] Power cables are cables used for transmitting and distributing electrical energy. They are commonly used in urban underground power grids, power plant lead-out lines, internal power supply in industrial and mining enterprises, and underwater transmission lines across rivers and seas. High-voltage cables are a type of power cable, mainly used for transmitting electrical energy between 1kV and 1000kV. They are core equipment for long-distance, high-capacity power transmission in power systems, and their core function is to connect power generation, transmission, and distribution links, supporting the stable operation of the power grid.

[0003] High-voltage cables generate Joule heat when transmitting current. If the heat cannot be dissipated in time, the conductor resistance will increase with the temperature, further aggravating energy loss. At the same time, the insulation layer resistance may decrease, which may lead to the risk of breakdown. Long-term high temperature will also accelerate the aging of polymer materials and shorten the service life of the cable. Existing cables do not have good heat dissipation performance.

[0004] Therefore, there is an urgent need for a composite high-voltage cable to solve the problems existing in the above-mentioned technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a composite high-voltage cable to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a composite high-voltage cable, including a cable body, a ring band on the cable body, an outer sheath, an inner sheath inside the outer sheath, an isolation layer inside the inner sheath, a plurality of conductors inside the isolation layer, a wrapping layer outside the conductors, a limiting member installed inside the isolation layer for fixing the conductors, a heat dissipation cavity formed between the limiting member and the conductors, a plurality of buffer strips between the isolation layer and the inner sheath, a buffer cavity formed between adjacent buffer strips, the heat dissipation cavity communicating with the buffer cavity, and a plurality of exhaust pipes circumferentially installed on the ring band, the exhaust pipes communicating with the buffer cavity.

[0007] Optionally, a sealing sleeve is fixedly installed on the outer side of the ring belt, and the sealing sleeve is located at the connection between the exhaust pipe and the ring belt.

[0008] Optionally, a filter head may be detachably connected to the end of the exhaust pipe, the filter head being used to prevent external impurities from entering the exhaust pipe and clogging it.

[0009] Optionally, the exhaust pipe is provided with external threads, and a sleeve is installed on the filter head. The inner wall of the sleeve is provided with internal threads, and the external threads are adapted to the internal threads.

[0010] Optionally, an annular groove is provided at the end of the exhaust pipe, and a sealing ring is installed in the annular groove.

[0011] Optionally, a plurality of auxiliary cables are arranged circumferentially on the inner side of the inner sheath, and an outer protective layer is wrapped around the outside of the auxiliary cables. A second shielding layer and a first shielding layer are arranged sequentially on the outside of the outer protective layer. A filling layer is arranged between the second shielding layer and the outer protective layer. The first shielding layer and the second shielding layer are located between the inner sheath and the isolation layer.

[0012] Optionally, a protective layer and a buffer layer are provided between the outer sheath and the inner sheath.

[0013] Optionally, the isolation layer has a plurality of second through holes, which communicate with the buffer cavity, and the buffer strip has a plurality of first through holes, which connect the plurality of buffer cavities.

[0014] Optionally, the center of the limiting member is provided with a cavity.

[0015] This invention discloses the following technical effects: The cable adopts a multi-layer structure, with a buffer strip forming a buffer cavity between the outer and inner sheaths. Within the insulation layer, a conductor is fixed by a limiting member, forming a heat dissipation cavity. The heat dissipation cavity and the buffer cavity are connected, and heat flows from the heat dissipation cavity to the buffer cavity and is finally discharged outwards through the exhaust pipe on the ring belt, thus achieving a good heat dissipation effect. One ring belt is placed every 50 meters or 100 meters to ensure effective heat dissipation. This invention improves the overall heat dissipation efficiency of the cable by forming a heat dissipation channel through the connection between the heat dissipation cavity and the buffer cavity. Furthermore, the buffer strip and the buffer cavity work together to absorb mechanical impact, enhancing vibration resistance. Simultaneously, the limiting member fixes the conductor to prevent displacement, ensuring electrical stability. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the cable of the present invention; Figure 3 This is a schematic diagram of the structure of the annular band of the present invention; Figure 4 For the present invention Figure 3 A magnified view of part A in the image; Figure 5This is a schematic diagram of the exhaust pipe structure of the present invention; Figure 6 For the present invention Figure 5 A magnified view of part B in the image; Figure 7 This is an assembly diagram of the filter head and exhaust pipe of the present invention; Figure 8 This is a schematic diagram of the structure of the isolation layer and buffer strip of the present invention; In the diagram: 1. Cable body; 2. Ring; 3. Sealing sleeve; 4. Outer sheath; 5. Protective layer; 6. Buffer layer; 7. Inner sheath; 8. Buffer strip; 9. Wrapping layer; 10. Limiting element; 11. Conductor; 12. Cavity; 13. First shielding layer; 14. Auxiliary cable; 15. Filling layer; 16. Isolation layer; 17. Outer protective layer; 18. Second shielding layer; 19. Heat dissipation cavity; 20. Buffer cavity; 21. Exhaust pipe; 22. Filter head; 23. Sleeve; 24. Sealing ring; 25. External thread; 26. Internal thread; 27. First through hole; 28. Second through hole. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figures 1 to 8 As shown, this embodiment provides a composite high-voltage cable, including a cable body 1, a ring band 2 on the cable body 1, an outer sheath 4, an inner sheath 7 inside the outer sheath 4, an isolation layer 16 inside the inner sheath 7, a plurality of conductors 11 inside the isolation layer 16, a wrapping layer 9 outside the conductors 11, a limiting member 10 installed inside the isolation layer 16 for fixing the conductors 11, a heat dissipation cavity 19 formed between the limiting member 10 and the conductors 11, a plurality of buffer strips 8 between the isolation layer 16 and the inner sheath 7, a buffer cavity 20 formed between two adjacent buffer strips 8, the heat dissipation cavity 19 and the buffer cavity 20 are connected, and a plurality of exhaust pipes 21 are circumferentially installed on the ring band 2, the exhaust pipes 21 are connected to the buffer cavity 20.

[0020] The cable adopts a multi-layer structure. A buffer strip 8 is set between the outer sheath 4 and the inner sheath 7 to form a buffer cavity 20. Within the isolation layer 16, the conductor 11 is fixed by a limiting member 10, forming a heat dissipation cavity 19. The heat dissipation cavity 19 is connected to the buffer cavity 20. Heat flows from the heat dissipation cavity 19 to the buffer cavity 20 and is finally discharged outward through the exhaust pipe 21 on the ring belt 2, thus achieving a good heat dissipation effect. A ring belt 2 is set every 50 meters or 100 meters to ensure the effectiveness of heat dissipation. This invention forms a heat dissipation channel through the connection between the heat dissipation cavity 19 and the buffer cavity 20, improving the overall heat dissipation efficiency of the cable. Furthermore, the buffer strip 8 and the buffer cavity 20 work together to absorb mechanical impact, enhancing vibration resistance. At the same time, the limiting member 10 fixes the conductor 11 to prevent displacement, ensuring electrical stability.

[0021] Further refining the design, a sealing sleeve 3 is fixedly installed on the outer side of the ring belt 2, located at the connection between the exhaust pipe 21 and the ring belt 2. The sealing sleeve 3 can prevent rainwater, dust and other impurities from entering the exhaust pipe 21 from the connection, avoiding blockage, ensuring the airtightness of the heat dissipation channel, and maintaining efficient heat dissipation performance.

[0022] Further refining the design, a filter head 22 is detachably connected to the end of the exhaust pipe 21. The filter head 22 is used to prevent external impurities from entering the exhaust pipe 21 and clogging it. The detachable design facilitates replacement of the filter head 22 during later maintenance, reducing maintenance costs. The filter head 22 can extend the service life of the equipment and prevent heat dissipation failure caused by blockage.

[0023] Further refining the design, the exhaust pipe 21 is provided with an external thread 25, and the filter head 22 is equipped with a sleeve 23. The inner wall of the sleeve 23 is provided with an internal thread 26, and the external thread 25 is adapted to the internal thread 26. The end of the exhaust pipe 21 is detachably connected to the sleeve 23 of the filter head 22 via the external thread 25 and the internal thread 26. The threaded connection structure is reliable and easy to operate.

[0024] The design is further refined by adding an annular groove at the end of the exhaust pipe 21, within which a sealing ring 24 is installed. The sealing ring 24 prevents impurities from seeping in, ensuring the long-term smooth operation of the exhaust pipe 21.

[0025] Further refining the design, several auxiliary cables 14 are arranged circumferentially inside the inner sheath 7. An outer protective layer 17 surrounds the auxiliary cables 14. A second shielding layer 18 and a first shielding layer 13 are sequentially arranged outside the outer protective layer 17. A filler layer 15 is placed between the second shielding layer 18 and the outer protective layer 17. The first shielding layer 13 and the second shielding layer 18 are located between the inner sheath 7 and the isolation layer 16. The first shielding layer 13 and the second shielding layer 18 form an electromagnetic shielding layer, reducing mutual interference between the main cable and the auxiliary cables 14. The filler layer 15 absorbs mechanical stress, protecting the structure of the auxiliary cables 14. The auxiliary cables 14 have expansion capabilities, enabling signal transmission and other functions, thus improving the overall utilization rate of the cable.

[0026] Further refining the design, a protective layer 5 and a buffer layer 6 are provided between the outer sheath 4 and the inner sheath 7. The protective layer 5 enhances the resistance to mechanical damage, while the buffer layer 6 absorbs impact energy and reduces internal structural damage caused by vibration or impact. This multi-layer composite structure can improve the overall weather resistance and service life of the cable.

[0027] Further refining the design, the isolation layer 16 has several second through holes 28, which communicate with the buffer chamber 20. The buffer strip 8 has several first through holes 27, which connect the buffer chambers 20. The second through holes 28 in the isolation layer 16 connect the buffer chambers 20, promoting airflow and accelerating the transfer of heat from the heat dissipation chamber 19 to the buffer chamber 20, thus improving heat dissipation efficiency. The first through holes 27 in the buffer strip 8 connect adjacent buffer chambers 20. During operation, the cable generates heat, which is discharged through the heat dissipation chamber 19 to the buffer chamber 20 and then discharged through the exhaust pipe 21, effectively dissipating internal heat. In addition, when there is a large amount of heat, it can be transferred from one buffer chamber 20 to another, thereby gradually alleviating the internal high temperature and ensuring good heat dissipation performance.

[0028] Further refining the design, the limiting component 10 has a cavity 12 at its center. The cavity 12 at the center of the limiting component 10 serves two purposes: firstly, it reduces weight and overall cable density, facilitating installation; secondly, it provides good toughness, balances internal and external pressures, reduces stress concentration caused by thermal expansion and contraction, and prevents structural damage.

[0029] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0030] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A composite high-voltage cable, characterized in that: The cable includes a cable body (1), on which a ring band (2) is provided. The cable body (1) includes an outer sheath (4), and an inner sheath (7) is provided inside the outer sheath (4). An isolation layer (16) is provided inside the inner sheath (7). A plurality of conductors (11) are provided inside the isolation layer (16). A wrapping layer (9) is provided outside the conductors (11). A limiting member (10) is installed inside the isolation layer (16). The limiting member (10) is used to fix the conductors (11). A heat dissipation cavity (19) is formed between the limiting member (10) and the conductors (11). A plurality of buffer strips (8) are provided between the isolation layer (16) and the inner sheath (7). A buffer cavity (20) is formed between two adjacent buffer strips (8). The heat dissipation cavity (19) is connected to the buffer cavity (20). A plurality of exhaust pipes (21) are installed circumferentially on the ring band (2). The exhaust pipes (21) are connected to the buffer cavity (20).

2. The composite high-voltage cable according to claim 1, characterized in that: A sealing sleeve (3) is fixedly installed on the outside of the ring (2), and the sealing sleeve (3) is located at the connection between the exhaust pipe (21) and the ring (2).

3. The composite high-voltage cable according to claim 1, characterized in that: The exhaust pipe (21) is detachably connected to a filter head (22), which is used to prevent external impurities from entering the exhaust pipe (21) and blocking it.

4. The composite high-voltage cable according to claim 3, characterized in that: The exhaust pipe (21) is provided with an external thread (25), and the filter head (22) is provided with a sleeve (23). The inner wall of the sleeve (23) is provided with an internal thread (26), and the external thread (25) is adapted to the internal thread (26).

5. The composite high-voltage cable according to claim 3, characterized in that: The exhaust pipe (21) has an annular groove at its end, and a sealing ring (24) is installed in the annular groove.

6. The composite high-voltage cable according to claim 1, characterized in that: The inner sheath (7) is provided with a plurality of auxiliary cables (14) circumferentially arranged on the inner side. The auxiliary cables (14) are wrapped with an outer protective layer (17) on the outside. A second shielding layer (18) and a first shielding layer (13) are arranged sequentially on the outside of the outer protective layer (17). A filling layer (15) is provided between the second shielding layer (18) and the outer protective layer (17). The first shielding layer (13) and the second shielding layer (18) are located between the inner sheath (7) and the isolation layer (16).

7. The composite high-voltage cable according to claim 1, characterized in that: A protective layer (5) and a buffer layer (6) are provided between the outer sheath (4) and the inner sheath (7).

8. The composite high-voltage cable according to claim 1, characterized in that: The isolation layer (16) has several second through holes (28) that are connected to the buffer cavity (20). The buffer strip (8) has several first through holes (27) that are connected to the buffer cavities (20).

9. The composite high-voltage cable according to claim 1, characterized in that: The center of the limiting member (10) is provided with a cavity (12).

Images