Copper core cross-linked polyethylene insulated medium-voltage power cable

Abstract

The invention discloses a copper core cross-linked polyethylene insulated medium-voltage power cable, and relates to the technical field of medium-voltage cables, a central positioning rubber rod is installed in the middle of the inner side of a rubber shaping wrapping layer, and the surface of the central positioning rubber rod is sleeved with a metal heat conduction round sleeve; arc-shaped metal heat conduction blocks are installed on the surface of the metal heat conduction round sleeve in the circumferential direction at equal intervals, arc-shaped positioning rubber protruding blocks are fixedly connected to the two ends of each arc-shaped metal heat conduction block, and metal heat conduction long rods are connected to the bottom end of the metal heat conduction round sleeve at equal intervals. The heat generated by the core body in the cable is transmitted outwards to the arc-shaped laminated metal sheets, so that the heat can be dissipated in time, the situation that the normal transmission power of the core body is affected by temperature rise caused by the fact that the heat is continuously accumulated in the cable for a long time is prevented, and cooling water in the hollow rubber sealing water storage sleeve plays a role in heat absorption and cooling. And the transmitted heat is absorbed, and rapid and efficient cooling is achieved.

Description

Technical Field

[0001] This invention relates to the field of medium-voltage cable technology, specifically to a copper-core cross-linked polyethylene insulated medium-voltage power cable. Background Technology

[0002] Cross-linked polyethylene (XLPE) insulation material is polyethylene that has undergone cross-linking between its macromolecules under the action of high-energy rays (such as gamma rays, alpha rays, electron rays, etc.) or cross-linking agents, which can improve its heat resistance and other properties. XLPE insulated power cables are a type of power cable that uses XLPE as the insulation layer. They are mainly used in fixed laying scenarios in power distribution networks or industrial installations with a rated voltage of 0.6 / 1kV and below, covering environments such as overhead, indoor, tunnels, and cable trenches. This cable transforms polyethylene into a three-dimensional network structure through a cross-linking process, possessing both chemical stability and high-temperature resistance, and has higher current carrying capacity and mechanical strength compared to traditional cables. However, during long-term operation of cables, the core continuously generates heat in its sealed internal environment, leading to heat accumulation inside the cable, poor heat dissipation, and inability to dissipate heat. The core being in a high-heat environment for a long time will affect its normal operation and transmission power. Therefore, this invention provides a copper core cross-linked polyethylene insulated medium-voltage power cable to meet people's needs. Summary of the Invention

[0003] This invention provides a copper core cross-linked polyethylene insulated medium-voltage power cable, which can effectively solve the problem mentioned in the background art that when the cable operates for a long time, the core is in its sealed internal environment and continuously generates heat, which leads to heat accumulation inside the cable, poor heat dissipation, and the inability to dissipate heat. The core being in a high-heat environment for a long time will affect its normal operation and transmission power.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a copper core cross-linked polyethylene insulated medium-voltage power cable, comprising three cores, each core having a rubber insulation layer extruded and wrapped on its surface, each rubber insulation layer having a metal braided shielding layer sleeved on its surface, each metal braided shielding layer having a shielding insulation layer sleeved on its surface, a rubber molding wrapping layer sleeved on the outside of each shielding insulation layer, a rubber protective sleeve sleeved on the outside of the rubber molding wrapping layer, and a high-efficiency heat dissipation and protection mechanism provided on the inside of the rubber molding wrapping layer; The high-efficiency heat dissipation and protection mechanism includes a central positioning rubber rod; A central positioning rubber rod is installed in the middle of the inner side of the rubber plastic wrapping layer, and a metal heat-conducting circular sleeve is sleeved on the surface of the central positioning rubber rod. The surface of the metal heat-conducting circular sleeve is equidistantly fitted with arc-shaped metal heat-conducting blocks along the circumferential direction, and both ends of the arc-shaped metal heat-conducting blocks are fixedly connected with arc-shaped positioning rubber protrusions. The bottom end of the metal heat-conducting circular sleeve is equidistantly connected with metal heat-conducting long rods, the bottom end of the rubber protective sleeve is embedded with an arc-shaped fitted metal sheet, and the bottom surface of the rubber protective sleeve is fitted with a hollow rubber sealing water-retaining sleeve.

[0005] According to the above technical solution, the three cores are equidistantly distributed on the outside of the central positioning rubber rod along the circumferential direction. The position of the arc-shaped metal heat-conducting block corresponds to the position of the three cores. The arc-shaped metal heat-conducting block and the arc-shaped positioning rubber protrusion are both tightly attached to the surface of the shielding insulation layer.

[0006] According to the above technical solution, the hollow rubber sealing water storage sleeve is provided with support partition blocks installed at equal intervals inside, and the bottom end of the hollow rubber sealing water storage sleeve is connected to an adhesive plate, and the bottom end of the adhesive plate is provided with metal heat dissipation fins. One side of the hollow rubber sealing water storage sleeve is fitted with a long plate, and the other side of the hollow rubber sealing water storage sleeve is connected with a limit binding strap at equal intervals. The middle of the fitted long plate is provided with positioning screw holes at equal intervals, and one end of the limit binding strap is fitted with a locking bolt. The top surface of the rubber protective sleeve is provided with limit grooves at equal intervals.

[0007] According to the above technical solution, the hollow rubber sealing water storage sleeve is filled with cooling water, the limiting binding strap is wrapped around the top surface of the rubber protective sleeve, and the top of the limiting binding strap is embedded in the interior of the limiting groove.

[0008] According to the above technical solution, the locking bolt moves through the limiting binding strap, one end of the locking bolt is embedded in the interior of the positioning screw hole, the hollow rubber sealing water storage sleeve and the rubber protective sleeve are fixed and bound together by the limiting binding strap and the locking bolt, and the hollow rubber sealing water storage sleeve is closely attached to the surface of the bottom end of the arc-shaped metal sheet.

[0009] According to the above technical solution, the surface of the rubber molding wrapping layer is covered with a heat insulation layer, the surface of the heat insulation layer is fitted with a cross-linked polyethylene insulation layer, and the interior of the rubber molding wrapping layer is filled with a filler layer.

[0010] According to the above technical solution, the outer wall of the cross-linked polyethylene insulation layer is tightly bonded to the inner wall of the rubber protective sleeve; The metal heat-conducting rod passes sequentially through the rubber molding wrapping layer, the heat insulation layer, the cross-linked polyethylene insulation layer, and the rubber protective sleeve, and the bottom end of the metal heat-conducting rod is connected to the arc-shaped attached metal sheet.

[0011] According to the above technical solution, a support and buffer mechanism is installed on the surface of the rubber protective sleeve; The supporting buffer mechanism includes an arc-shaped, tightly fitted fixing block; The surface of the rubber protective sleeve is symmetrically equipped with arc-shaped tight-fitting fixing blocks, and one end of the bottom of the arc-shaped tight-fitting fixing blocks is connected to an inclined fixing block. An arc-shaped metal buffer spring is installed in the middle of the bottom of the inclined fixing block. A positioning rotating rod is rotatably installed at the bottom end of the arc-shaped fixed block, and an inclined swing support block is connected to the middle of the positioning rotating rod. An installation through hole is opened at the bottom end of the arc-shaped fixed block. The top surface of the rubber protective sleeve is equidistantly equipped with fixed splicing blocks, and the middle of the fixed splicing block is provided with an installation groove. A rubber connecting strip is fixedly installed at the bottom of the inner wall of the installation groove. A limiting piston block is embedded in the middle of the mounting groove, and the two ends of the limiting piston block are symmetrically connected with tight-fitting compression pads.

[0012] According to the above technical solution, the positions of every two arc-shaped fixing blocks correspond to each other, and the top of the arc-shaped fixing block is connected to the edge of the rubber connecting strip. Both ends of the positioning rotating rod are fixedly connected to rotating cylinders, which are movably embedded inside the mounting through hole. The bottom end of the arc-shaped metal buffer spring is connected to the inclined swing support block, and the horizontal plane height of the bottom end of the inclined swing support block is lower than the horizontal plane height of the bottom end of the metal heat dissipation fins.

[0013] According to the above technical solution, the compression pad is tightly fitted to the inner wall of the fixed splicing block, the bottom of the limiting piston block is arc-shaped, and the bottom end of the limiting piston block is pressed tightly against the top surface of the arc-shaped fixed block and the rubber connecting strip.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a scientific and reasonable structure and is safe and convenient to use. 1. It is equipped with a high-efficiency heat dissipation and protection mechanism. The arc-shaped metal heat-conducting block, the metal heat-conducting circular sleeve and the metal heat-conducting long rod work together to form a heat conduction flow path. The heat generated inside the cable core is transferred to the arc-shaped attached metal sheet, which can facilitate the timely dissipation of heat and prevent the heat from accumulating inside the cable for a long time, causing the temperature to rise and affecting the normal transmission power of the core. In addition, the cooling water inside the hollow rubber sealed water jacket plays a role in absorbing heat and cooling down, absorbing the transferred heat and achieving rapid and efficient cooling. The arc-shaped metal heat-conducting block serves to position and install the core, separating and limiting the cores to maintain a certain distance between them after production and installation, preventing the cores from being too close together and affecting each other. In addition, the arc-shaped positioning rubber protrusion wraps and fixes the core to prevent it from falling off the center of the arc-shaped metal heat-conducting block, making operation and installation more convenient and quick. Furthermore, the curved metal sheet and the hollow rubber sealing water-retaining sleeve are located on the bottom surface of the rubber protective sleeve, covering and sealing the protruding part of the metal heat-conducting rod to prevent gaps from causing water penetration.

[0015] 2. The hollow rubber sealing water jacket is supported and stabilized by the support partition block to prevent it from being squeezed and deformed, which would cause uneven distribution of cooling water and affect heat dissipation. This improves the structural stability of the hollow rubber sealing water jacket. At the same time, the metal heat dissipation fins increase the heat dissipation area from below, which can quickly guide heat out of the hollow rubber sealing water jacket and reduce the temperature of the cooling water, so that it can continuously absorb heat and cool down for a long time. By utilizing the interplay of locking bolts and positioning screw holes, the limiting binding strap is locked and fixed, allowing it to wrap around and be fixed to the outside of the rubber protective sleeve. This serves to fix and splice the hollow rubber sealing water-retaining sleeve, ensuring it can stably and tightly adhere to the curved metal sheet. The splicing and fixing method is simple during cable installation, while the limiting groove positions the limiting binding strap, making the binding and splicing more stable.

[0016] 3. A support and buffer mechanism is provided, which uses the limit piston block and the rubber connecting strip to press and position the arc-shaped tight-fitting fixing block, so that it can fit tightly against the surface of the rubber protective sleeve. This, in turn, positions the arc-shaped metal buffer spring and the tilting swing support block. The tilting swing support block and the arc-shaped tight-fitting fixing block provide support and stability for the cable as a whole, improving the stability of the cable during placement and installation. Furthermore, when the cable is squeezed or touched by foreign objects during installation and use, the entire cable will sink. The arc-shaped metal buffer spring and the tilted swing support block will convert the sinking pressure into the elastic potential energy of deformation, thereby achieving the function of buffer protection and preventing the pressure from being directly applied to the cable and causing the cable to be flattened and deformed.

[0017] 4. The rubber connecting strip provides sufficient flexible swing space for the splicing and clamping of the arc-shaped tight-fitting fixing block, which is convenient for clamping operation. The limiting piston block and the fixed splicing block work together to press and fix the arc-shaped tight-fitting fixing block, preventing it from becoming unstable after clamping and causing the cable to fall off. The insertion and installation of the limiting piston block is simple, which greatly facilitates splicing, assembly and disassembly. At the same time, the tight-fitting compression rubber pad improves the installation stability of the limiting piston block and prevents the limiting piston block from sliding off.

[0018] In summary, by combining a high-efficiency heat dissipation and protection mechanism with a support and buffer mechanism, the cable is protected from different directions. Heat dissipation can dissipate excess heat from inside the cable, allowing the core to operate at a suitable and safe temperature, while support and protection can reduce damage to the cable caused by the external environment. The inclined swing support block in the support and buffer mechanism supports the entire cable, so that the bottom of the metal heat sink fins does not come into contact with the mounting surface, preventing damage to the metal heat sink fins and providing sufficient space for heat dissipation. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0020] In the attached diagram: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic cross-sectional view of the cable of the present invention; Figure 3 This is a schematic diagram of the locking bolt of the present invention; Figure 4 This is a schematic diagram of the installation structure of the arc-shaped metal sheet of the present invention; Figure 5 This is a schematic diagram of the installation structure of the metal heat-conducting rod of the present invention; Figure 6 This is a schematic diagram of the structure of the high-efficiency heat dissipation and protection mechanism of the present invention; Figure 7 This is a schematic diagram of the installation structure of the arc-shaped metal buffer spring of the present invention; Figure 8 This is a schematic diagram of the supporting buffer mechanism of the present invention; The diagram labels are as follows: 1. Core; 2. Rubber insulation layer; 3. Metal braided shielding layer; 4. Shielding insulation layer; 5. Rubber molding wrapping layer; 6. Heat insulation layer; 7. High-efficiency heat dissipation and protection mechanism; 701. Central positioning rubber rod; 702. Metal heat-conducting circular sleeve; 703. Arc-shaped metal heat-conducting block; 704. Arc-shaped positioning rubber protrusion; 705. Metal heat-conducting long rod; 706. Arc-shaped bonding metal sheet; 707. Hollow rubber sealing water-retaining sleeve; 708. Supporting partition block; 709. Adhesive plate; 710. Metal heat dissipation fins; 711. Bonding long plate; 712. Positioning screw hole; 713. Limiting binding strap; 714. Locking bolt; 715. Limiting groove; 8. Support and buffer mechanism; 801. Arc-shaped close-fitting fixing block; 802. Inclined fixing block; 803. Arc-shaped metal buffer spring; 804. Positioning rotating rod; 805. Inclined swing support block; 806. Fixed splicing block; 807. Mounting groove; 808. Rubber connecting strip; 809. Limiting piston block; 810. Close-fitting compression pad; 811. Mounting through hole; 9. Cross-linked polyethylene insulation layer; 10. Rubber protective sleeve; 11. Filler layer. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Example: Figure 1-8 As shown, the present invention provides a technical solution: a copper core cross-linked polyethylene insulated medium-voltage power cable, comprising three cores 1, each core 1 having a rubber insulation layer 2 extruded and wrapped on its surface, each rubber insulation layer 2 having a metal braided shielding layer 3 sleeved on its surface, each metal braided shielding layer 3 having a shielding insulation layer 4 sleeved on its surface, each shielding insulation layer 4 having a rubber molding wrapping layer 5 sleeved on its outer side, each rubber molding wrapping layer 5 having a rubber protective sleeve 10 sleeved on its outer side, and an efficient heat dissipation and protection mechanism 7 provided on the inner side of the rubber molding wrapping layer 5; The high-efficiency heat dissipation and protection mechanism 7 includes a central positioning rubber rod 701, a metal heat-conducting circular sleeve 702, an arc-shaped metal heat-conducting block 703, an arc-shaped positioning rubber protrusion 704, a metal heat-conducting long rod 705, an arc-shaped bonding metal sheet 706, a hollow rubber sealing water-retaining sleeve 707, a support partition block 708, a bonding plate 709, metal heat dissipation fins 710, a bonding long plate 711, a positioning screw hole 712, a limiting binding strap 713, a locking bolt 714, and a limiting groove 715; A central positioning rubber rod 701 is installed in the middle of the inner side of the rubber molding wrapping layer 5, and a metal heat-conducting circular sleeve 702 is sleeved on the surface of the central positioning rubber rod 701. Arc-shaped metal heat-conducting blocks 703 are equidistantly installed on the surface of the metal heat-conducting circular sleeve 702 along the circumferential direction. Arc-shaped positioning rubber protrusions 704 are fixedly connected to both ends of the arc-shaped metal heat-conducting blocks 703. Three cores 1 are equidistantly distributed on the outside of the central positioning rubber rod 701 along the circumferential direction. The position of the arc-shaped metal heat-conducting blocks 703 corresponds to the position of the three cores 1. The arc-shaped metal heat-conducting blocks 703 and the arc-shaped positioning rubber protrusions 704 are tightly attached to the surface of the shielding insulation layer 4. Metal heat-conducting circular sleeve 702 is equidistantly connected to metal heat-conducting long rods 705 at its bottom end. An arc-shaped metal sheet 706 is embedded in the bottom end of the rubber protective sleeve 10. A hollow rubber sealing water-retaining sleeve 707 is fitted to the bottom surface of the rubber protective sleeve 10. The arc-shaped metal heat-conducting block 703, the metal heat-conducting circular sleeve 702, and the metal heat-conducting long rods 705 work together to form a heat conduction flow path, transferring the heat generated inside the cable core 1 to the arc-shaped metal sheet 706 so that the heat can be dissipated in time, preventing the heat from accumulating inside the cable for a long time and causing the temperature to rise, affecting the normal transmission power of the core 1. In addition, the cooling water inside the hollow rubber sealing water-retaining sleeve 707 plays a role in absorbing heat and cooling down, absorbing the transferred heat and achieving rapid and efficient cooling. Meanwhile, the arc-shaped metal heat-conducting block 703 plays a role in positioning and installing the core 1, separating and limiting the core 1 so that they maintain a certain distance from each other after production and installation, preventing the core 1 from getting too close and affecting each other. In addition, the arc-shaped positioning rubber protrusion 704 wraps and fixes the core 1 to prevent the core 1 from falling off the middle of the arc-shaped metal heat-conducting block 703, making operation and installation more convenient and quick. Furthermore, the arc-shaped metal sheet 706 and the hollow rubber sealing water storage sleeve 707 are located on the bottom surface of the rubber protective sleeve 10, covering and sealing the protruding part of the metal heat-conducting rod 705 to prevent gaps from causing water to seep in. The hollow rubber sealing water storage sleeve 707 has support partition blocks 708 installed at equal intervals inside. The bottom end of the hollow rubber sealing water storage sleeve 707 is fixedly connected to an adhesive plate 709, and the bottom end of the adhesive plate 709 is equipped with metal heat dissipation fins 710. A fitting plate 711 is installed on one side of the hollow rubber sealing water storage sleeve 707, and a limiting binding strap 713 is connected at equal intervals on the other side of the hollow rubber sealing water storage sleeve 707. Positioning screw holes 712 are equally spaced in the middle of the fitting plate 711. A locking bolt 714 is installed at one end of the limiting binding strap 713. Limiting grooves 715 are equally spaced on the top surface of the rubber protective sleeve 10. The interior of the hollow rubber sealing water storage sleeve 707 is filled with cooling water. The limiting binding strap 713 wraps around the top surface of the rubber protective sleeve 10, and the top of the limiting binding strap 713 is embedded in the limiting groove 715. The locking bolt 714 moves through the limiting binding strap 713, and one end of the locking bolt 714 is embedded in the positioning screw hole. Inside 712, the hollow rubber sealing water storage jacket 707 and the rubber protective sleeve 10 are fixed and bound together by the limiting binding strap 713 and the locking bolt 714. The hollow rubber sealing water storage jacket 707 is closely attached to the surface of the bottom end of the arc-shaped metal sheet 706. The hollow rubber sealing water storage jacket 707 is supported and stabilized by the support partition block 708 to prevent it from being squeezed and deformed, which would cause uneven distribution of cooling water and affect heat dissipation. This improves the structural stability of the hollow rubber sealing water storage jacket 707. At the same time, the metal heat dissipation fins 710 increase the heat dissipation area from below, which can quickly guide heat out of the hollow rubber sealing water storage jacket 707 and reduce the temperature of the cooling water, so that it can continuously absorb heat and cool down for a long time. The locking bolt 714 and the positioning screw hole 712 are used to lock and fix the limiting binding strap 713, so that the limiting binding strap 713 can be fixed around the outside of the rubber protective sleeve 10, which plays a role in fixing and splicing the hollow rubber sealing water storage sleeve 707, so that it can be stably and tightly attached to the arc-shaped metal sheet 706. The splicing and fixing method is simple during cable installation. The limiting groove 715 plays a positioning role for the limiting binding strap 713, making its binding and splicing more stable. The surface of the rubber molding wrapping layer 5 is covered with a heat insulation layer 6, and the surface of the heat insulation layer 6 is fitted with a cross-linked polyethylene insulation layer 9. The outer wall of the cross-linked polyethylene insulation layer 9 is tightly fitted with the inner wall of the rubber protective sleeve 10. The interior of the rubber molding wrapping layer 5 is filled with a filler layer 11. A metal heat-conducting rod 705 passes through the rubber molding wrapping layer 5, the heat insulation layer 6, the cross-linked polyethylene insulation layer 9 and the rubber protective sleeve 10 in sequence. The bottom end of the metal heat-conducting rod 705 is connected to an arc-shaped metal sheet 706. A support and buffer mechanism 8 is installed on the surface of the rubber protective sleeve 10; The support and buffer mechanism 8 includes an arc-shaped close-fitting fixing block 801, an inclined fixing block 802, an arc-shaped metal buffer spring 803, a positioning rotating rod 804, an inclined swing support block 805, a fixed splicing block 806, a mounting groove 807, a rubber connecting strip 808, a limiting piston block 809, a close-fitting compression rubber pad 810, and a mounting through hole 811. The surface of the rubber protective cover 10 is symmetrically equipped with arc-shaped tight-fitting fixing blocks 801. One end of the bottom of the arc-shaped tight-fitting fixing block 801 is connected to an inclined fixing block 802. An arc-shaped metal buffer spring 803 is installed in the middle of the bottom of the inclined fixing block 802. A positioning rotating rod 804 is rotatably installed at the bottom of the arc-shaped tight-fitting fixing block 801. An inclined swing support block 805 is connected in the middle of the positioning rotating rod 804. An installation through hole 811 is opened at the bottom of the arc-shaped tight-fitting fixing block 801. Fixed splicing blocks 806 are equidistantly installed on the top surface of the rubber protective sleeve 10. An installation groove 807 is opened in the middle of the fixed splicing block 806. A rubber connecting strip 808 is fixedly installed at the bottom of the inner wall of the installation groove 807. Every two arc-shaped fixed blocks 801 are positioned corresponding to each other. The top of the arc-shaped fixed blocks 801 is connected to the edge of the rubber connecting strip 808. Both ends of the positioning rotating rod 804 are fixedly connected to rotating cylinders, which are movably embedded in the installation through hole 811. The bottom end of the arc-shaped metal buffer spring 803 is connected to the inclined swing support block 805. The bottom end of the arc-shaped metal buffer spring 803 is connected to the inclined swing support block 805. The horizontal height of the bottom end of the inclined swing support block 805 is lower than the horizontal height of the bottom end of the metal heat dissipation fin 710. A limiting piston block 809 is embedded in the middle of the mounting groove 807. The two ends of the limiting piston block 809 are symmetrically connected with compression pads 810. The compression pads 810 are tightly fitted to the inner wall of the fixing splice block 806. The bottom of the limiting piston block 809 is arc-shaped. The bottom end of the limiting piston block 809 is pressed tightly against the top surface of the arc-shaped fixing block 801 and the rubber connecting strip 808. By cooperating with each other, the limiting piston block 809 and the rubber connecting strip 808 play a role in pressing and positioning the arc-shaped fixing block 801, so that it can be tightly attached to the surface of the rubber protective sleeve 10. This, in turn, plays a role in positioning the arc-shaped metal buffer spring 803 and the tilting swing support block 805. The tilting swing support block 805 and the arc-shaped fixing block 801 provide support and stability for the cable as a whole, improving the stability of the cable during installation. Furthermore, when the cable is squeezed or touched by foreign objects during installation and use, the entire cable will sink. The arc-shaped metal buffer spring 803 and the tilted swing support block 805 will convert the sinking pressure into the elastic potential energy of deformation, thereby achieving the function of buffer protection and preventing the pressure from being directly applied to the cable and causing the cable to be flattened and deformed. The rubber connecting strip 808 provides sufficient flexible swing space for the splicing and clamping of the arc-shaped tight-fitting fixing block 801, facilitating clamping operations. The limiting piston block 809 and the fixing splicing block 806 cooperate with each other to press and fix the arc-shaped tight-fitting fixing block 801, preventing it from becoming unstable after clamping and causing the cable to fall off. The insertion and installation method of the limiting piston block 809 is simple, which greatly facilitates splicing, assembly and disassembly. At the same time, the tight-fitting compression rubber pad 810 improves the installation stability of the limiting piston block 809 and prevents the limiting piston block 809 from sliding off.

[0023] The working principle and usage process of this invention are as follows: First, during the cable production process, the rubber insulation layer 2 is extruded and wrapped around the surface of the three cores 1. Then, the metal braided shielding layer 3 and the shielding insulation layer 4 are sequentially attached. The three cores 1 are placed equidistantly on the outside of the central positioning rubber rod 701. According to the orientation of the arc-shaped metal heat-conducting block 703, the core 1 is embedded and installed. The arc-shaped positioning rubber protrusion 704 is pulled outward to open, so that the core 1 can smoothly enter the interior of the arc-shaped metal heat-conducting block 703. Then, the inner wall of the arc-shaped metal heat-conducting block 703 and the outer wall of the shielding insulation layer 4 are close together. After the arc-shaped positioning rubber protrusion 704 is released, it also adheres tightly to the shielding insulation layer 4. The arc-shaped positioning rubber protrusion 704 plays a role in limiting the core 1 and preventing it from falling off the arc-shaped metal heat-conducting block 703. Then, the rubber molding wrapping layer 5, the heat insulation layer 6, the cross-linked polyethylene insulation layer 9, and the rubber protective sleeve 10 are sequentially fitted and installed. An arc-shaped metal sheet 706 is embedded and adhesively installed at the bottom of the surface of the rubber protective sleeve 10. The gaps inside the rubber molding wrapping layer 5 are filled with a filling layer 11, which is a polypropylene wrapping tape. The metal heat-conducting long rod 705 is connected to the metal heat-conducting round sleeve 702 on the surface of the central positioning rubber rod 701. During cable production, the metal heat-conducting long rod 705 is kept to pass through the rubber molding wrapping layer 5, the heat insulation layer 6, the cross-linked polyethylene insulation layer 9, and the rubber protective sleeve 10 in sequence, and is connected to the arc-shaped metal sheet 706. During cable installation, the fixing splicing block 806 is placed on the top surface of the rubber protective sleeve 10. At its bottom are rubber connecting strips 808, each connected to two arc-shaped, tightly fitting fixing blocks 801. These two arc-shaped, tightly fitting fixing blocks 801 are symmetrically placed on the surface of the rubber protective sleeve 10, ensuring they are tightly fitted against the surface wall of the rubber protective sleeve 10. The tilting and swinging support block 805 faces downwards, contacting the installation ground. The operator then takes the limiting piston block 809 and inserts it into the installation... Inside the mounting groove 807, the tops of the two arc-shaped tight-fitting fixing blocks 801 are pressed and limited, so that the arc-shaped tight-fitting fixing blocks 801 can no longer swing on the surface of the rubber protective sleeve 10. The tight-fitting compression pad 810 is squeezed and deformed and fits against the inner wall of the fixing splicing block 806, so that the limiting piston block 809 will not easily fall off. In this way, the tilting swing support block 805, the arc-shaped metal buffer spring 803 and the arc-shaped tight-fitting fixing block 801 play a role in supporting and stabilizing the cable as a whole. There is a certain gap between the bottom end of the rubber protective sleeve 10 and the mounting plane. Next, the staff placed the hollow rubber sealing water storage sleeve 707 under the rubber protective sleeve 10, aligned the limiting binding strap 713 with the position of the limiting groove 715, wrapped it around the top of the rubber protective sleeve 10 and then attached it to the corresponding long plate 711, pulled the limiting binding strap 713 upward and tightened it, took the locking bolt 714, passed it through the limiting binding strap 713 and screwed it into the positioning screw hole 712, which played a role in locking and fixing the hollow rubber sealing water storage sleeve 707, so that the hollow rubber sealing water storage sleeve 707 was tightly attached to the bottom surface of the arc-shaped attached metal sheet 706, and there was a gap between the metal heat dissipation fins 710 at the bottom and the installation and placement plane. During cable use, the core 1 generates heat as it continuously operates and transmits heat. This heat accumulates inside the cable and diffuses outward. The heat is then transferred to the arc-shaped metal heat-conducting block 703, the metal heat-conducting circular sleeve 702, and the metal heat-conducting long rod 705, forming an outward heat conduction path. The heat is then transferred to the arc-shaped fitted metal sheet 706. The hollow rubber sealed water-storing sleeve 707 contains cooling water, which absorbs the transferred heat and plays a role in heat conduction and cooling. Meanwhile, the metal heat dissipation fins 710 increase the contact area with the air, thereby transferring the heat absorbed by the cooling water to the external environment. The cooling water can continuously absorb heat, allowing the core 1 to operate in a suitable temperature environment. Meanwhile, when the cable is placed and used, the arc-shaped fixed block 801 and the tilting swing support block 805 support and stabilize the cable, preventing the cable from tilting and swinging, thus improving the installation stability of the cable. If a foreign object squeezes or touches the top of the cable from above, it will put pressure on the cable and cause the cable to sink. The tilting swing support block 805 will be squeezed and swing. The arc-shaped metal buffer spring 803 will bend and deform after being pressed, converting the pressure into bending elastic potential energy, thereby relieving the pressure and buffering the cable during the sinking process after being pressed, preventing the cable from being squeezed and deformed.

[0024] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A copper-core cross-linked polyethylene insulated medium-voltage power cable, comprising three cores (1), characterized in that: The surfaces of the three cores (1) are all extruded and wrapped with rubber insulation layers (2), the surfaces of the three rubber insulation layers (2) are all fitted with metal braided shielding layers (3), the surfaces of the three metal braided shielding layers (3) are all fitted with shielding insulation layers (4), the outer sides of the three shielding insulation layers (4) are fitted with rubber shaping wrapping layers (5), the outer sides of the rubber shaping wrapping layers (5) are fitted with rubber protective sleeves (10), and the inner side of the rubber shaping wrapping layers (5) is provided with a high-efficiency heat dissipation and protection mechanism (7). The high-efficiency heat dissipation and protection mechanism (7) includes a central positioning rubber rod (701). A central positioning rubber rod (701) is installed in the middle of the inner side of the rubber shaping wrapping layer (5), and a metal heat-conducting round sleeve (702) is sleeved on the surface of the central positioning rubber rod (701). The surface of the metal heat-conducting circular sleeve (702) is equidistantly equipped with arc-shaped metal heat-conducting blocks (703) along the circumferential direction, and arc-shaped positioning rubber protrusions (704) are fixedly connected to both ends of the arc-shaped metal heat-conducting blocks (703). The bottom end of the metal heat-conducting circular sleeve (702) is equidistantly connected with metal heat-conducting long rods (705), the bottom end of the rubber protective sleeve (10) is embedded with an arc-shaped metal sheet (706), and the bottom surface of the rubber protective sleeve (10) is fitted with a hollow rubber sealing water-retaining sleeve (707).

2. The copper-core cross-linked polyethylene insulated medium-voltage power cable according to claim 1, characterized in that, The three cores (1) are equidistantly distributed along the circumferential direction on the outside of the central positioning rubber rod (701). The position of the arc-shaped metal heat-conducting block (703) corresponds to the position of the three cores (1). The arc-shaped metal heat-conducting block (703) and the arc-shaped positioning rubber protrusion (704) are closely attached to the surface of the shielding insulation layer (4).

3. A copper-core cross-linked polyethylene insulated medium-voltage power cable according to claim 1, characterized in that, The hollow rubber sealing water storage sleeve (707) has support partition blocks (708) installed at equal intervals inside. The bottom end of the hollow rubber sealing water storage sleeve (707) is connected to an adhesive plate (709). The bottom end of the adhesive plate (709) is equipped with metal heat dissipation fins (710). The hollow rubber sealing water storage sleeve (707) has a fitting long plate (711) installed on one side, and a limit binding strap (713) is connected at equal intervals on the other side of the hollow rubber sealing water storage sleeve (707). The fitting long plate (711) has positioning screw holes (712) at equal intervals in the middle. A locking bolt (714) is installed at one end of the limit binding strap (713). The rubber protective sleeve (10) has limit grooves (715) at equal intervals on the top surface.

4. A copper-core cross-linked polyethylene insulated medium-voltage power cable according to claim 3, characterized in that, The hollow rubber sealing water storage sleeve (707) is filled with cooling water. The limiting binding strap (713) is wrapped around the top surface of the rubber protective sleeve (10). The top of the limiting binding strap (713) is embedded in the limiting groove (715).

5. A copper-core cross-linked polyethylene insulated medium-voltage power cable according to claim 1, characterized in that, The locking bolt (714) is movably inserted through the limiting binding strap (713). One end of the locking bolt (714) is embedded inside the positioning screw hole (712). The hollow rubber sealing water storage sleeve (707) and the rubber protective sleeve (10) are fixedly bound together by the limiting binding strap (713) and the locking bolt (714). The hollow rubber sealing water storage sleeve (707) is closely attached to the surface of the bottom end of the arc-shaped fitting metal sheet (706).

6. A copper-core cross-linked polyethylene insulated medium-voltage power cable according to claim 1, characterized in that, The surface of the rubber molding wrapping layer (5) is covered with a heat insulation layer (6), the surface of the heat insulation layer (6) is covered with a cross-linked polyethylene insulation layer (9), and the interior of the rubber molding wrapping layer (5) is filled with a filler layer (11).

7. A copper-core cross-linked polyethylene insulated medium-voltage power cable according to claim 6, characterized in that, The outer wall of the cross-linked polyethylene insulation layer (9) is tightly fitted to the inner wall of the rubber protective sleeve (10); The metal heat-conducting rod (705) passes through the rubber plastic wrapping layer (5), the heat insulation layer (6), the cross-linked polyethylene insulation layer (9) and the rubber protective sleeve (10) in sequence, and the bottom end of the metal heat-conducting rod (705) is connected to the arc-shaped metal sheet (706).

8. A copper-core cross-linked polyethylene insulated medium-voltage power cable according to claim 1, characterized in that, The surface of the rubber protective sleeve (10) is equipped with a support and buffer mechanism (8); The support and buffer mechanism (8) includes an arc-shaped, tightly attached fixing block (801); The surface of the rubber protective sleeve (10) is symmetrically equipped with arc-shaped tight-fitting fixing blocks (801), and one end of the bottom of the arc-shaped tight-fitting fixing block (801) is connected to an inclined fixing block (802). An arc-shaped metal buffer spring (803) is installed in the middle of the bottom of the inclined fixing block (802). A positioning rotating rod (804) is rotatably installed at the bottom end of the arc-shaped tight-fitting fixing block (801), and an inclined swing support block (805) is connected to the middle part of the positioning rotating rod (804). An installation through hole (811) is opened at the bottom end of the arc-shaped tight-fitting fixing block (801). The top surface of the rubber protective sleeve (10) is equidistantly equipped with fixed splicing blocks (806), and the middle part of the fixed splicing block (806) is provided with an installation groove (807). A rubber connecting strip (808) is fixedly installed at the bottom of the inner wall of the installation groove (807). A limiting piston block (809) is embedded in the middle of the mounting groove (807), and the two ends of the limiting piston block (809) are symmetrically connected with compression pads (810).

9. A copper-core cross-linked polyethylene insulated medium-voltage power cable according to claim 8, characterized in that, The positions of each pair of the arc-shaped close-fitting fixing blocks (801) correspond to each other, and the top of the arc-shaped close-fitting fixing blocks (801) is connected to the edge of the rubber connecting strip (808); Both ends of the positioning rotating rod (804) are fixedly connected to rotating cylinders, which are movably embedded in the installation through hole (811). The bottom end of the arc-shaped metal buffer spring (803) is connected to the inclined swing support block (805). The horizontal height of the bottom end of the inclined swing support block (805) is lower than the horizontal height of the bottom end of the metal heat dissipation fin (710).

10. A copper-core cross-linked polyethylene insulated medium-voltage power cable according to claim 8, characterized in that, The compression pad (810) is tightly fitted to the inner wall of the fixed splicing block (806), the bottom of the limiting piston block (809) is arc-shaped, and the bottom end of the limiting piston block (809) is pressed tightly against the top surface of the arc-shaped fixed block (801) and the rubber connecting strip (808).

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