Environment-friendly medium voltage cross-linked polyethylene insulated power cable

Abstract

The application relates to the field of cables, in particular to an environment-friendly medium-voltage cross-linked polyethylene insulated power cable, which comprises a plurality of conductive wire cores, the wire core surfaces are coated with insulation layers, the insulation layer surfaces are coated with inner sheaths, a plurality of heat dissipation mechanisms are linearly arranged on the outer walls of the inner sheaths, and outer sheaths are arranged between the adjacent two heat dissipation mechanisms. The heat dissipation shell, the annular sealing plate and the rotary driving mechanism are arranged, when the temperature is lower than a first threshold value, the first communication groove and the second communication groove are kept dislocated, the cable is in a full sealing state, and external environment erosion is effectively resisted; when the temperature exceeds the first threshold value, the rotary driving mechanism automatically drives the annular sealing plate to rotate to make the two grooves communicate, an air convection channel is formed, the temperature of the insulation layer is reduced, and the thermal aging problem caused by long-time high-temperature operation is avoided.

Description

Technical Field

[0001] This invention relates to the field of cables, and more particularly to an environmentally friendly medium-voltage cross-linked polyethylene insulated power cable. Background Technology

[0002] Currently, medium-voltage cross-linked polyethylene insulated power cables are widely used in urban power distribution networks, industrial sites, and new energy fields due to their excellent electrical and heat resistance properties. These cables typically consist of a conductive core, a cross-linked polyethylene insulation layer covering the core, an inner sheath, and an outer sheath, forming a multi-layered composite structure.

[0003] During cable operation, the conductive core generates Joule heat due to the current passing through it. Especially under high load or high ambient temperature, heat accumulates. If the heat cannot be dissipated effectively in time, the insulation layer will be in a high-temperature state for a long time, which will accelerate the thermal and oxidative aging of the cross-linked polyethylene material, leading to a decrease in insulation performance and even easily causing thermal breakdown accidents.

[0004] Therefore, this invention proposes an environmentally friendly medium-voltage cross-linked polyethylene insulated power cable to solve the above problems. Summary of the Invention

[0005] To achieve the above objectives, the technical solution adopted by this invention is as follows: an environmentally friendly medium-voltage cross-linked polyethylene insulated power cable, comprising several conductive cores, the surface of each core being covered with an insulation layer, the surface of which is covered with an inner sheath, and the outer wall of the inner sheath having several heat dissipation mechanisms arranged in a linear array, with an outer sheath disposed between adjacent heat dissipation mechanisms, the heat dissipation mechanism comprising: A heat dissipation shell, wherein the inner wall of the heat dissipation shell is fixedly connected to the outside of the inner sheath, and the two ends of the outer sheath are sleeved on the ends of two adjacent heat dissipation shells. Several first connecting grooves are symmetrically opened at both ends of the heat dissipation shell, and several ventilation micropores are symmetrically opened in a ring array on the outer wall of the heat dissipation shell. Two annular sealing plates are symmetrically and slidably connected on both sides of the heat dissipation shell. The sidewalls of the annular sealing plates are provided with several second connecting slots that are misaligned with the first connecting slot. When the heat of the insulation layer exceeds a first threshold, the rotary drive mechanism drives the annular sealing plate to rotate, so that the first connecting groove and the first connecting groove are connected.

[0006] Preferably, the rotary drive mechanism includes: An annular heat-conducting shell, with its inner wall fitted onto an inner sheath, is filled with an inert gas. A piston ring is slidably connected to the annular heat-conducting shell, and a connecting rod is fixedly connected to the side wall array of the piston ring. A drive ring is fixedly connected to the end of the connecting rod. An annular rotating plate, the end of which is fixedly connected to the side wall of an annular sealing plate, and several driving grooves are arranged in an annular array on the outer wall of the annular driving plate. A first sliding pin is fixedly connected to the inner side of the driving ring at the position corresponding to the driving groove, and the first sliding pin is slidably connected in the driving groove.

[0007] Preferably, an annular partition is fixedly connected inside the heat dissipation shell to divide the heat dissipation shell into two chambers, left and right, and the ventilation micropores are distributed on both sides of the partition.

[0008] Preferably, the drive groove includes a first straight groove, a first arc-shaped groove, and a second straight groove.

[0009] Preferably, the inner wall of the heat sink housing is provided with a third connecting groove, and the side wall of the annular sealing plate is provided with a fourth connecting groove that communicates with the third connecting groove.

[0010] Preferably, the heat dissipation shell has several adsorption shells symmetrically and rotatably connected on both sides of the partition. The sidewall of the adsorption shell is provided with through holes. The adsorption shell contains smoke and dust adsorbent. The heat dissipation shell has air holes arrayed on both sides of the partition. The adsorption shell is symmetrically and fixedly connected with arc-shaped sealing plates on both sides. The heat dissipation shell is equipped with a rotation drive component. When the heat of the insulation layer exceeds the second threshold, the rotation drive component drives the adsorption shell to rotate, so that the adsorption shell, which was originally at the position of the ventilation micropore, rotates to the position of the air hole. The arc-shaped sealing plate seals the ventilation micropore.

[0011] Preferably, the rotary drive assembly includes: Several L-shaped drive frames are slidably connected to the heat sink in a circular array. A second sliding pin is fixedly connected to the top of each L-shaped drive frame, and a spring is fixedly connected between the L-shaped drive frame and the heat sink. The second arc-shaped groove is formed at the bottom end of the adsorption shell, and the second sliding pin is slidably connected in the second arc-shaped groove; When the heat of the insulation layer exceeds the second threshold, the first sliding pin moves along the second straight groove, pushing the L-shaped drive frame to move through the drive ring, thereby driving the adsorption shell to rotate.

[0012] Preferably, the inner wall of the outer sheath is provided with a fireproof layer.

[0013] Preferably, the outer side of the heat dissipation shell is coated with a hydrophobic layer.

[0014] Preferably, the end of the heat sink shell is fixedly connected with several connecting blocks in an annular array, and the connecting blocks are fixedly connected to the annular heat-conducting shell.

[0015] Compared with the prior art, the present invention has the following beneficial effects: I. This invention, by setting up a heat dissipation shell, an annular sealing plate and a rotary drive mechanism, ensures that when the temperature is below a first threshold, the first connecting groove and the second connecting groove remain misaligned, and the cable is in a fully sealed state, effectively resisting external environmental corrosion; when the temperature exceeds the first threshold, the rotary drive mechanism automatically drives the annular sealing plate to rotate, making the two grooves connected and forming an air convection channel, thereby cooling the insulation layer temperature and avoiding thermal aging problems caused by long-term high-temperature operation.

[0016] Second, by setting a third and a fourth connecting groove, when the insulation layer temperature of the cable is below a set threshold during normal operation, the third and fourth connecting grooves are connected, allowing airflow to circulate freely in the insulation layer, which helps to keep the temperature of the cable constant. When the cable temperature rises, the annular sealing plate rotates, the first and second connecting grooves are connected, and the third and fourth connecting grooves are misaligned and sealed, isolating the location with abnormal temperature, and then dissipating heat through the heat dissipation shell.

[0017] Third, by setting up an adsorption shell and a rotation drive assembly, when a local part of the cable catches fire due to overload and the temperature reaches the second threshold, the first sliding pin moves along the second straight groove, and pushes the L-shaped drive frame to move through the drive ring, so that the second sliding pin moves along the second arc groove. Under the drive of the second arc groove, the adsorption shell moves, so that the adsorption shell, which was originally connected to the ventilation micropore, rotates to the position of the air hole. After the flue gas enters the adsorption shell for adsorption treatment, it is discharged through the air hole, which helps to reduce environmental pollution. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram showing the connection between the heat dissipation shell and the annular heat-conducting shell in this invention; Figure 5 This is a schematic diagram showing the connection between the heat sink and the connecting block of the present invention; Figure 6 This is a schematic diagram showing the connection between the adsorption shell and the annular heat-conducting shell of the present invention; Figure 7 This is a schematic diagram showing the connection between the annular sealing plate and the annular rotating plate in this invention; Figure 8 This is a schematic diagram showing the connection between the annular heat-conducting shell and the driving ring in this invention; Figure 9 This is a schematic diagram showing the connection between the adsorption shell and the L-shaped drive frame in this invention.

[0019] In the diagram: 1. Wire core; 2. Insulation layer; 3. Inner sheath; 4. Outer sheath; 5. Fireproof layer; 6. Heat dissipation shell; 6. Annular partition plate; 601. First connecting groove; 602. Ventilation micropore; 603. Third connecting groove; 604. Air hole; 605. Annular sealing plate; 7. Second connecting groove; 701. Fourth connecting groove; 702. Connecting block; 8. Annular heat-conducting shell; 9. Piston ring; 10. Drive ring; 11. First sliding pin; 12. Annular rotating plate; 13. Drive groove; 14. First straight groove; 1401. First arc groove; 1402. Second straight groove; 1403. Adsorption shell; 15. Through hole; 1501. Arc sealing plate; 1502. Second arc groove; 1502. L-shaped drive frame; 16. Second sliding pin; 17. Spring; 18. Detailed Implementation

[0020] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0021] like Figures 1 to 9 The environmentally friendly medium-voltage cross-linked polyethylene insulated power cable shown includes several conductive cores 1, the surface of which is covered with an insulation layer 2, and the surface of the insulation layer 2 is covered with an inner sheath 3. Several heat dissipation mechanisms are linearly arrayed on the outer wall of the inner sheath 3, and an outer sheath 4 is disposed between two adjacent heat dissipation mechanisms. The heat dissipation mechanisms include: The heat sink 6 has its inner wall fixedly connected to the outside of the inner sleeve 3. The outer sleeve 4 is fitted at both ends of two adjacent heat sinks 6. Several first connecting grooves 602 are symmetrically opened at both ends of the heat sink 6. Several ventilation microholes 603 are symmetrically distributed in a ring array on the outer wall of the heat sink 6. Two annular sealing plates 7 are symmetrically and slidably connected to both sides of the heat dissipation shell 6. The sidewalls of the annular sealing plates 7 are provided with several second connecting grooves 701 that are misaligned with the first connecting groove 602. When the heat of the insulation layer 2 exceeds the first threshold, the rotary drive mechanism drives the ring 11-shaped sealing plate 7 to rotate, so that the first connecting groove 602 and the first connecting groove 602 are connected. The rotary drive mechanism includes: An annular heat-conducting shell 9, the inner wall of the annular heat-conducting shell 9 is fitted on the inner sheath 3, the annular shell is filled with inert gas, a piston ring 10 is sealed and slidably connected inside the annular heat-conducting shell 9, a connecting rod is fixedly connected to the side wall array of the piston ring 10, and a drive ring 11 is fixedly connected to the end of the connecting rod. The annular rotating plate 13 is fixedly connected at its end to the side wall of the annular sealing plate 7. Several driving grooves 14 are arranged in annular array on the outer wall of the annular driving plate. A first sliding pin 12 is fixedly connected to the inner side of the driving ring 11 at the position corresponding to the driving groove 14. The first sliding pin 12 is slidably connected in the driving groove 14. Several connecting blocks 8 are fixedly connected to the annular array at the end of the heat dissipation shell 6, and the connecting blocks 8 are fixedly connected to the annular heat-conducting shell 9; An annular partition 601 is fixedly connected inside the heat sink 6 to divide the heat sink 6 into two chambers, left and right, and ventilation micropores 603 are distributed on both sides of the partition. In existing technologies, during cable operation, the conductive core 1 generates Joule heat due to the current flowing through it. Especially under high loads or high ambient temperatures, heat accumulates. If the heat cannot be dissipated effectively and in a timely manner, the insulation layer 2 will remain at a high temperature for a long time, which will accelerate the thermal-oxidative aging of the cross-linked polyethylene material, leading to a decrease in insulation performance and even easily causing thermal breakdown accidents. This technical solution can solve the above problems. The specific operation is as follows: When the temperature of the insulation layer 2 of the cable is below the set threshold during normal operation, the inert gas filled inside the annular heat-conducting shell 9 is at room temperature, with a small volume and low pressure. The piston ring 10 is kept in the initial position inside the annular heat-conducting shell 9 (usually on the side away from the cable end). At this time, the first sliding pin 12 inside the drive ring 11 is located at the starting position of the drive groove 14 on the annular rotating plate 13 (in the first straight groove 1401). In this state, the second connecting groove 701 and the first connecting groove 602 are kept in a misaligned relationship, the airflow channel is closed, and the annular partition 601 divides the heat dissipation shell 6 into two independent chambers on the left and right. However, due to the misalignment of the first connecting groove 602 and the second connecting groove 701, there is no air convection between the two chambers or between the chambers and the outside. The heat generated inside the cable is slowly dissipated through the inner sheath 3, the heat dissipation shell 6 and the outer sheath 4 via solid heat conduction. The cable as a whole is in a fully sealed protective state. When the current carried by the cable increases or the ambient temperature rises, the temperature of the insulation layer 2 gradually rises. The heat is transferred to the annular heat-conducting shell 9 through the inner sheath 3. The annular heat-conducting shell 9 is made of a high thermal conductivity material, which quickly conducts the heat to the internal inert gas. The inert gas expands in volume after being heated, and the internal pressure of the annular heat-conducting shell 9 increases, pushing the piston ring 10 to slide axially toward the end of the heat dissipation shell 6. The axial movement of the piston ring 10 drives the drive ring 11 to move synchronously through the connecting rod. The first sliding pin 12 on the inner side of the drive ring 11 slides in the drive groove 14 accordingly. The first sliding pin 12 first slides along the first straight groove 1401. During this stage, only axial displacement occurs. The annular rotating plate 13 does not rotate, the annular sealing plate 7 maintains its original angle, and the first connecting groove 602 and the second connecting groove 701 are still misaligned. This process is to adapt to the normal heating of the cable. When the cable temperature exceeds the first threshold, the first sliding pin 12 enters the first arc groove 1402. As the arc groove deflects circumferentially, when the drive ring 11 continues to move axially, the first sliding pin 12 forces the annular rotating plate 13 to rotate circumferentially under the guidance of the arc groove. The annular rotating plate 13 is fixedly connected to the annular sealing plate 7, so the annular sealing plate 7 rotates synchronously, causing the second connecting groove 701 to gradually approach the first connecting groove 602. When the piston ring 10 moves to its limit position, the first sliding pin 12 enters the second straight groove 1403. At this time, the annular sealing plate 7 rotates to the position where the second connecting groove 701 is fully aligned with the first connecting groove 602. The second straight groove 1403 extends axially to ensure that when the temperature continues to rise, the first sliding pin 12 only moves axially and no longer changes the rotation angle, so that the heat dissipation channel remains in a stable fully open state. After the first connecting groove 602 and the second connecting groove 701 are fully aligned, a through airflow channel is formed inside the heat dissipation mechanism. Hot air enters the inner area of ​​the annular sealing plate 7 through the first connecting groove 602 and the second connecting groove 701 on this side, and then is discharged to the outside atmosphere through the ventilation micro-hole 603 on the same side. This helps to remove the heat generated by the conductive core 1 from the inside of the cable, so that the temperature of the insulation layer 2 can be effectively controlled, and the thermal aging problem caused by long-term high-temperature operation can be avoided. After the cable temperature recovers, the above operation is performed to keep the second connecting groove 701 and the first connecting groove 602 in a staggered relationship, the airflow channel is closed, and the cable is in a fully sealed protective state.

[0022] As a further embodiment of the present invention, a third connecting groove 604 is provided on the inner side wall of the heat dissipation shell 6, and a fourth connecting groove 702 communicating with the third connecting groove 604 is provided on the side wall of the annular sealing plate 7. Specifically, when the temperature of the insulation layer 2 is below the set threshold during normal operation of the cable, the third connecting groove 604 and the fourth connecting groove 702 are connected, allowing airflow at the insulation layer 2 to circulate freely, which helps to keep the temperature of the cable constant. When the cable temperature rises, the annular sealing plate 7 rotates, the first connecting groove 602 and the second connecting groove 701 are connected, and the third connecting groove 604 and the fourth connecting groove 702 are misaligned and sealed, isolating the location with abnormal temperature, and then dissipating heat through the heat dissipation shell 6 separately.

[0023] As a further embodiment of the present invention, the heat dissipation shell 6 is symmetrically and rotatably connected to several adsorption shells 15 on both sides of the partition. The side wall of the adsorption shell 15 is provided with through holes 1501. The adsorption shell 15 is provided with smoke and dust adsorbent. The heat dissipation shell 6 is provided with air holes 605 in an array on both sides of the partition. The adsorption shell 15 is symmetrically and fixedly connected to the two sides of the adsorption shell 15 with arc-shaped sealing plates 1502. The heat sink 6 is equipped with a rotation drive component. When the heat of the insulation layer 2 exceeds the second threshold, the rotation drive component drives the adsorption shell 15 to rotate, so that the adsorption shell 15, which was originally at the position of the ventilation microhole 603, rotates to the position of the air hole 605. The arc sealing plate 1502 seals the ventilation microhole 603. The rotary drive assembly includes: Several L-shaped drive brackets 16 are slidably connected to the heat sink 6 in a circular array. A second sliding pin 17 is fixedly connected to the top of each L-shaped drive bracket 16. A spring 18 is fixedly connected between the L-shaped drive bracket 16 and the heat sink 6. The second arc-shaped groove 1502 is formed at the bottom end of the adsorption shell 15, and the second sliding pin 17 is slidably connected in the second arc-shaped groove 1502. When the heat of the insulation layer 2 exceeds the second threshold, the first sliding pin 12 moves along the second straight groove 1403, and pushes the L-shaped drive frame 16 to move through the drive ring 11, so as to drive the adsorption shell 15 to rotate. Specifically, when the cable temperature does not exceed the second threshold, the adsorption shell 15 is connected to the ventilation micro-hole 603, and the sealing plate seals the vent 605. When a local fire occurs in the cable due to overload, the temperature rises further (when the second threshold is reached). The first sliding pin 12 moves along the second straight groove 1403 and pushes the L-shaped drive frame 16 to move through the drive ring 11, causing the second sliding pin 17 to move along the second arc groove 1502. Driven by the second arc groove 1502, the adsorption shell 15 (filled with adsorbent) moves, causing the adsorption shell 15, which was originally connected to the ventilation micro-hole 603, to rotate to the position of the vent 605. At this time, the sealing plate seals the ventilation micro-hole 603, preventing the flue gas from being directly discharged through the ventilation micro-hole 603, and preventing external high-temperature flue gas, toxic gases, and dust from directly entering the cable. Subsequently, the flue gas is adsorbed and treated by the adsorption shell 15 and discharged through the vent 605, which helps to reduce environmental pollution.

[0024] As a further embodiment of the present invention, a fireproof layer 5 is provided on the inner wall of the outer sheath 4; this helps to mitigate the outward spread of fire.

[0025] As a further embodiment of the present invention, a hydrophobic layer is coated on the outer side of the heat dissipation shell 6 to reduce the blockage of the ventilation micropores 603 by liquid water.

[0026] The working principle of this invention is as follows: When the temperature of the insulation layer 2 of the cable is lower than the set threshold during normal operation, the inert gas filled inside the annular heat-conducting shell 9 is at room temperature, with a small volume and low pressure. The piston ring 10 maintains its initial position inside the annular heat-conducting shell 9 (usually on the side away from the cable end). At this time, the first sliding pin 12 inside the drive ring 11 is located at the starting position of the drive groove 14 on the annular rotating plate 13 (in the first straight groove 1401). In this state, the second connecting groove 701 and the first connecting groove 602 are kept in a misaligned relationship, the airflow channel is closed, and the annular partition 601 divides the heat dissipation shell 6 into two independent chambers on the left and right. However, due to the misalignment of the first connecting groove 602 and the second connecting groove 701, there is no air convection between the two chambers or between the chambers and the outside. The heat generated inside the cable is slowly dissipated through the inner sheath 3, the heat dissipation shell 6 and the outer sheath 4 via solid heat conduction. The cable as a whole is in a fully sealed protective state. When the current carried by the cable increases or the ambient temperature rises, the temperature of the insulation layer 2 gradually rises. The heat is transferred to the annular heat-conducting shell 9 through the inner sheath 3. The annular heat-conducting shell 9 is made of a high thermal conductivity material, which quickly conducts the heat to the internal inert gas. The inert gas expands in volume after being heated, and the internal pressure of the annular heat-conducting shell 9 increases, pushing the piston ring 10 to slide axially toward the end of the heat dissipation shell 6. The axial movement of the piston ring 10 drives the drive ring 11 to move synchronously through the connecting rod. The first sliding pin 12 on the inner side of the drive ring 11 slides in the drive groove 14 accordingly. The first sliding pin 12 first slides along the first straight groove 1401. During this stage, only axial displacement occurs. The annular rotating plate 13 does not rotate, the annular sealing plate 7 maintains its original angle, and the first connecting groove 602 and the second connecting groove 701 are still misaligned. This process is to adapt to the normal heating of the cable. When the cable temperature exceeds the first threshold, the first sliding pin 12 enters the first arc groove 1402. As the arc groove deflects circumferentially, when the drive ring 11 continues to move axially, the first sliding pin 12 forces the annular rotating plate 13 to rotate circumferentially under the guidance of the arc groove. The annular rotating plate 13 is fixedly connected to the annular sealing plate 7, so the annular sealing plate 7 rotates synchronously, causing the second connecting groove 701 to gradually approach the first connecting groove 602. When the piston ring 10 moves to its limit position, the first sliding pin 12 enters the second straight groove 1403. At this time, the annular sealing plate 7 rotates to the position where the second connecting groove 701 is fully aligned with the first connecting groove 602. The second straight groove 1403 extends axially to ensure that when the temperature continues to rise, the first sliding pin 12 only moves axially and no longer changes the rotation angle, so that the heat dissipation channel remains in a stable fully open state. After the first connecting groove 602 and the second connecting groove 701 are fully aligned, a through airflow channel is formed inside the heat dissipation mechanism. Hot air enters the inner area of ​​the annular sealing plate 7 through the first connecting groove 602 and the second connecting groove 701 on this side, and then is discharged to the outside atmosphere through the ventilation micro-hole 603 on the same side. This helps to remove the heat generated by the conductive core 1 from the inside of the cable, so that the temperature of the insulation layer 2 can be effectively controlled, and the thermal aging problem caused by long-term high-temperature operation can be avoided. After the cable temperature recovers, the above operation is performed to keep the second connecting groove 701 and the first connecting groove 602 in a staggered relationship, the airflow channel is closed, and the cable is in a fully sealed protective state.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An environmentally friendly medium-voltage cross-linked polyethylene insulated power cable, comprising several conductive cores (1), wherein the surface of each core (1) is covered with an insulation layer (2), the surface of the insulation layer (2) is covered with an inner sheath (3), and the outer wall of the inner sheath (3) is provided with several heat dissipation mechanisms arranged in a linear array, and an outer sheath (4) is provided between two adjacent heat dissipation mechanisms, characterized in that, The heat dissipation mechanism includes: The heat sink (6) has its inner wall fixedly connected to the outside of the inner sleeve (3). The outer sleeve (4) is fitted at both ends of two adjacent heat sinks (6). Several first connecting grooves (602) are symmetrically opened at both ends of the heat sink (6). Several ventilation microholes (603) are symmetrically opened on the outer wall of the heat sink (6). Two annular sealing plates (7) are symmetrically slidably connected on both sides of the heat dissipation shell (6). The sidewalls of the annular sealing plates (7) are provided with several second connecting grooves (701) that are misaligned with the first connecting groove (602). When the heat of the insulation layer (2) exceeds the first threshold, the rotary drive mechanism drives the ring (11) shaped sealing plate (7) to rotate, so that the first connecting groove (602) and the first connecting groove (602) are connected.

2. The environmentally friendly medium-voltage cross-linked polyethylene insulated power cable according to claim 1, characterized in that, The rotary drive mechanism includes: An annular heat-conducting shell (9) is fitted on the inner sleeve (3) with its inner wall covered by an inert gas. A piston ring (10) is slidably connected inside the annular heat-conducting shell (9). A connecting rod is fixedly connected to the side wall array of the piston ring (10), and a drive ring (11) is fixedly connected to the end of the connecting rod. The annular rotating plate (13) is fixedly connected at its end to the side wall of the annular sealing plate (7). The outer wall of the annular driving plate has several driving grooves (14) arranged in annular array. The inner side of the driving ring (11) is fixedly connected to the position of the driving groove (14). The first sliding pin (12) is slidably connected in the driving groove (14).

3. The environmentally friendly medium-voltage cross-linked polyethylene insulated power cable according to claim 2, characterized in that, An annular partition (601) is fixedly connected inside the heat dissipation shell (6) to divide the heat dissipation shell (6) into two chambers, left and right. The ventilation micropores (603) are distributed on both sides of the partition.

4. The environmentally friendly medium-voltage cross-linked polyethylene insulated power cable according to claim 3, characterized in that, The drive groove (14) includes a first straight groove (1401), a first arc groove (1402), and a second straight groove (1403).

5. The environmentally friendly medium-voltage cross-linked polyethylene insulated power cable according to claim 4, characterized in that, The inner wall of the heat sink (6) is provided with a third connecting groove (604), and the side wall of the annular sealing plate (7) is provided with a fourth connecting groove (702) that communicates with the third connecting groove (604).

6. The environmentally friendly medium-voltage cross-linked polyethylene insulated power cable according to claim 5, characterized in that, The heat dissipation shell (6) has several adsorption shells (15) symmetrically and rotatably connected on both sides of the partition. The side wall of the adsorption shell (15) is provided with through holes (1501). The adsorption shell (15) contains smoke and dust adsorbent. The heat dissipation shell (6) has air holes (605) arrayed on both sides of the partition. The adsorption shell (15) is symmetrically and fixedly connected with arc-shaped sealing plates (1502) on both sides. The heat dissipation shell (6) is provided with a rotation drive component. When the heat of the insulation layer (2) exceeds the second threshold, the rotation drive component drives the adsorption shell (15) to rotate, so that the adsorption shell (15) which was originally at the position of the ventilation microhole (603) rotates to the position of the air hole (605) and the arc-shaped sealing plate (1502) seals the ventilation microhole (603).

7. The environmentally friendly medium-voltage cross-linked polyethylene insulated power cable according to claim 5, characterized in that, The rotation drive assembly includes: Several L-shaped drive frames (16) are arranged in a ring array and slidably connected to the heat sink (6). A second sliding pin (17) is fixedly connected to the top of each L-shaped drive frame (16). A spring (18) is fixedly connected between the L-shaped drive frame (16) and the heat sink (6). The second arc-shaped groove (1502) is opened at the bottom end of the adsorption shell (15), and the second sliding pin (17) is slidably connected in the second arc-shaped groove (1502); When the heat of the insulation layer (2) exceeds the second threshold, the first sliding pin (12) moves along the second straight groove (1403) and pushes the L-shaped drive frame (16) to move through the drive ring (11) to drive the adsorption shell (15) to rotate.

8. The environmentally friendly medium-voltage cross-linked polyethylene insulated power cable according to claim 1, characterized in that, The inner wall of the outer sheath (4) is provided with a fireproof layer (5).

9. The environmentally friendly medium-voltage cross-linked polyethylene insulated power cable according to claim 1, characterized in that, The heat dissipation shell (6) is coated with a hydrophobic layer on its outer side.

10. An environmentally friendly medium-voltage cross-linked polyethylene insulated power cable according to claim 1, characterized in that, The heat sink (6) has several connecting blocks (8) fixedly connected to the annular array at its end, and the connecting blocks (8) are fixedly connected to the annular heat-conducting shell (9).

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