Cross-linked polyethylene insulated power cable terminal structure

Abstract

The invention discloses a cross-linked polyethylene insulated power cable terminal structure, and relates to the technical field of cable terminals, the cross-linked polyethylene insulated power cable terminal structure comprises two clamping rings, a connecting module and a temperature sensing module, the two clamping rings are respectively used for sleeving and clamping one end, close to each other, of a terminal head and a sheath tube so as to respectively fix the terminal head and the sheath tube, and the temperature sensing module is connected with the connecting module. Each clamping ring comprises two semi-rings, one ends of the two semi-rings are hinged, and the other ends of the two semi-rings are connected through a fastener, so that the two semi-rings are tightly combined into the complete clamping ring; the connecting module is arranged between the two clamping rings and used for combining the two clamping rings into a whole; the temperature sensing module is located in one of the clamping rings, is arranged corresponding to the stress cone and is used for sensing the temperature of the stress cone part in real time; a temperature indicating piece is movably arranged in the clamping ring, and the temperature sensing module drives the temperature indicating piece to move according to temperature changes so as to display the temperature outwards in real time. The terminal head has the effect of improving the connection stability of the terminal head and the protective sleeve.

Description

Technical Field

[0001] This application relates to the technical field of cable terminals, and particularly to a cross-linked polyethylene insulated power cable terminal structure. Background Art

[0002] A power cable terminal refers to a device installed at the end of a cable, used to connect the cable to electrical equipment, overhead lines, or other cables. The main function of the cable terminal is to provide a reliable electrical connection while ensuring the insulation performance and mechanical protection of the cable. The copper conductor of the cable is usually wrapped with an insulating layer, and cross-linked polyethylene insulation (XLPE) is a polyethylene material processed by chemical or physical methods, whose molecular structure changes from linear to a three-dimensional network structure. This structural transformation endows it with higher heat resistance, mechanical strength, and electrical properties, enabling functions such as electrical insulation, optimized electric field distribution, mechanical protection, and sealing performance, ensuring the safe and reliable operation of the cable terminal.

[0003] Cable terminals include heat-shrinkable terminals and cold-shrinkable terminals. Among them, the heat-shrinkable terminal shrinks to a predetermined size by heating during installation, while the cold-shrinkable terminal generally uses rubber materials with good elasticity (such as silicone rubber and ethylene propylene rubber), and it shrinks onto the cable by pulling out the support strip during installation. The cold-shrinkable terminal generally includes a terminal head and a protective sleeve. The terminal head is sleeved outside the exposed copper wire core, and the protective sleeve covers the shield layer with the metal sheath peeled off. One end of the terminal head is also covered outside the end of the protective sleeve. A stress cone is also provided inside the terminal head to evenly distribute the electric field, prevent corona discharge, and ensure the long-term stable operation of the cable terminal. The stress cone is provided at one end of the terminal head close to the protective sleeve.

[0004] Since both the terminal head and the protective sleeve are directly sleeved outside the cable during installation, and the cable terminals outdoors are often exposed to environments such as wind, sun, or rain, over time, the terminal head may become loose. Once the terminal head becomes loose, it will cause abnormal heating of the cable terminal, especially in the area near the stress cone, which will further affect the working state and lifespan of the cable terminal. Summary of the Invention

[0005] In order to improve the situation where the terminal head of an outdoor cable terminal may become loose during actual operation, resulting in abnormal heating, this application provides a cross-linked polyethylene insulated power cable terminal structure.

[0006] This application provides a cross-linked polyethylene insulated power cable terminal structure, adopting the following technical solutions: A cross-linked polyethylene insulated power cable terminal structure includes Clamping rings, there are two of them. The two clamping rings are respectively used to sleeved and clamp on the mutually approaching ends of the terminal head and the protective sleeve to fix the terminal head and the protective sleeve respectively. Each clamping ring includes two half-rings. One end of the two half-rings is hinged, and the other end is connected by a fastener so that the two half-rings are closely combined into a complete clamping ring; Connection module, arranged between the two clamping rings, used to combine the two clamping rings into a whole; Temperature sensing module, located in one of the clamping rings. The temperature sensing module is arranged corresponding to the stress cone and is used to sense the temperature of the stress cone part in real time; A temperature indicating member is movably arranged in the clamping ring. The temperature sensing module drives the temperature indicating member to move according to the temperature change to externally display the temperature state of the stress cone in real time.

[0007] Optionally, the temperature sensing module includes a temperature sensing member and a heat conducting member. The heat conducting member is closely attached to the outer wall of the terminal head and is arranged corresponding to the stress cone. One end of the temperature sensing member is connected to the heat conducting member, and the other end is connected to the end of the temperature indicating member. The temperature sensing member can expand and contract along its own length direction according to the temperature change to drive the temperature indicating member to move.

[0008] Optionally, the temperature indicating member is rotatably connected in the clamping ring, and the rotation axis is perpendicular to both the length direction of the temperature indicating member and the length direction of the temperature sensing member at the same time. Two temperature indicating areas with different colors are arranged at intervals along the length direction of the temperature indicating member to correspondingly display different temperature states of the stress cone. Two observation windows are arranged diagonally on the outer wall of the clamping ring. When the temperature indicating member rotates, the temperature indicating areas on it appear at different observation windows respectively.

[0009] Optionally, the temperature indicating member is rotatably connected in the clamping ring through a rotating shaft. The rotating shaft is close to the end where the temperature indicating member is connected to the temperature sensing member, and the temperature indicating area is arranged at the end of the temperature indicating member away from the temperature sensing member.

[0010] Optionally, the temperature indicating member can drive the connection module to unlock or lock during the rotation process. When the terminal head is in a normal temperature state, the connection module is locked; when the terminal head is in an abnormal temperature state, the temperature indicating member drives the connection module to unlock so that the two clamping rings are independent of each other.

[0011] Optionally, the connection module includes a connecting rod. A locking groove is arranged on the side wall of one end of the connecting rod. The end of the connecting rod with the locking groove is inserted into the clamping ring provided with the temperature indicating member. The other end of the connecting rod is hinged to the other clamping ring. A locking rod is rotatably connected in the clamping ring. The rotation axis of the locking rod is parallel to the length direction of the temperature sensing member. A locking block is arranged at one end of the locking rod. When the temperature indicating member rotates, it can drive the locking rod to rotate so that the locking block is lapped and locked with the locking groove.

[0012] Optionally, a driving block is provided at one end of the temperature indicating member away from the temperature sensing member. The driving block is arc-shaped and is slidably connected within the clamping ring. The side wall of the driving block contacts the end of the locking rod away from the locking block, and the thickness of the driving block gradually increases along the extending direction of its own arc. The driving block is located between the locking rod and the side wall of the clamping ring. A restoring member is provided inside the clamping ring. One end of the restoring member is connected to the inner wall of the clamping ring, and the other end is connected to the locking block.

[0013] Optionally, a prompting member is slidably connected within the clamping ring. The prompting member includes a prompting rod and a connecting plate. The connecting plate is located within the clamping ring and is arranged corresponding to the locking block. A plurality of prompting rods are provided and are evenly spaced on the side wall of the connecting plate away from the locking block. One end of the prompting rod penetrates and is slidably connected to the side wall of the clamping ring. When the locking block moves along with the locking rod, it can contact the connecting plate and push the prompting rod out of the clamping ring.

[0014] Optionally, a cooling channel is provided inside the prompting rod. The cooling channel includes an air inlet and an air outlet that are connected. The air inlet is located inside the clamping ring and penetrates the connecting plate. The air outlet is opened on the side wall of the prompting rod. When the prompting rod slides, the air outlet is conducted or blocked by the side wall of the clamping ring.

[0015] In summary, the present application includes at least one of the following beneficial effects: 1. By sleeving a clamping ring on each of the terminal head and the protective sleeve, and the clamping ring clamps the end of the terminal head and the protective sleeve that are close to each other. At the same time, the two clamping rings are combined into a whole through a connecting rod. Each clamping ring respectively clamps the ends of the terminal head and the protective sleeve, so that the relative movement between the terminal head and the protective sleeve is minimized, thereby maintaining the stability of the installation position of the terminal head. And after the two clamping rings are combined into a whole, they can move together as a whole or keep the position fixed. The two clamping rings can clamp more firmly on the cable, and at the same time, the contact area between the clamping ring and the cable is larger, and the clamping force of the clamping ring on the cable is greater, further maintaining the stability of the installation positions of the terminal head and the protective sleeve, and reducing the abnormal heating of the cable caused by the loosening of the terminal head. 2. By arranging a temperature-sensitive component and a temperature-indicating component in the clamping ring corresponding to the stress cone, the length of the temperature-sensitive component can change according to different temperatures. The heat-conducting component is closely attached to the outside of the stress cone. If the cable abnormally heats up at the stress cone position, the heat at the stress cone can be quickly transferred to the heat-conducting component, and then the heat-conducting component transfers the heat to the temperature-sensitive component, causing the temperature of the temperature-sensitive component to gradually rise. The temperature-sensitive component that has risen in temperature elongates along its own length direction, and the elongated temperature-sensitive component drives the temperature-indicating component to rotate along its own rotation axis. During the rotation of the temperature-indicating component, the temperature-indicating areas of different colors on the temperature-indicating component rotate accordingly. When the temperature at the stress cone rises to the alarm temperature, the temperature-indicating area indicating "high-temperature warning" on the temperature-indicating component rotates to correspond to one of the observation windows, so that the warning color on the temperature-indicating area can be revealed outward through the observation window, prompting the maintenance personnel to check the terminal head here. When the temperature at the stress cone is normal, the temperature-indicating area indicating "normal temperature" on the temperature-indicating component rotates to correspond to the other observation window, used to externally display that the temperature of the terminal head here is normal, thus reducing the judgment time of the maintenance personnel; 3. By arranging a rotatable locking rod in the clamping ring, under normal circumstances, the locking rod rotates under the drive of the restoring component, so that the locking block remains in a state of overlapping with the locking groove. At this time, the two clamping rings are combined into a whole through the overlapping of the locking block and the locking groove. When the temperature at the stress cone abnormally rises, the temperature-indicating component rotates, and the rotating temperature-indicating component drives the driving block to rotate synchronously. Since the thickness of the driving block gradually increases and contacts the end of the locking rod away from the locking block, the driving block will gradually drive the locking rod to rotate after rotation. At this time, the locking block moves away from the connecting rod direction. When the temperature at the stress cone rises to the temperature that needs to be warned, the driving block just drives the locking block to disengage from the locking groove. At this time, the two clamping rings are separated into independent individuals, facilitating the maintenance personnel to remove the clamping rings. At the same time, the prompting rod is pushed out of the clamping ring under the drive of the locking rod, and the protruding prompting rod can be used to prompt the maintenance personnel to check the terminal head here. When the temperature at the stress cone returns to normal, the locking block can be driven by the restoring component to overlap with the locking groove again, making the two clamping rings recombine into a whole. At this time, the prompting rod still remains protruding, and it can also play a role in prompting the maintenance personnel to perform maintenance. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram showing the overall structure of the power cable terminal in the embodiment of the present application; Figure 2 is Figure 1 a cross-sectional schematic diagram at A-A; Figure 3 is Figure 2 an enlarged schematic diagram at B; Figure 4 is a partial structural schematic diagram showing the position of the observation window in the embodiment of the present application; Figure 5It is a partial cross-sectional schematic diagram showing the working principle of the temperature indicating member in the embodiment of the present application; Figure 6 It is a partial cross-sectional schematic diagram showing the working principle of the locking rod in the embodiment of the present application; Figure 7 is Figure 6 An enlarged schematic diagram at C.

[0017] Explanation of reference numerals: 1, terminal head; 11, stress cone; 2, protective sleeve; 3, first clamping ring; 31, temperature indicating member; 311, temperature indicating area; 312, driving block; 32, temperature sensing module; 321, temperature sensing member; 322, heat conducting member; 323, limiting groove; 33, locking rod; 331, locking block; 34, arc-shaped guiding block; 35, restoring member; 36, connecting plate; 361, magnetic sheet; 37, observation window; 4, second clamping ring; 5, half ring; 51, fastener; 6, connecting rod; 61, locking groove; 7, prompting rod; 71, cooling channel; 72, air inlet; 73, air outlet. Detailed implementation manners

[0018] The following further Figures 1-7 describes the present application in detail with reference to the

[0019] The embodiment of the present application discloses a cross-linked polyethylene insulated power cable terminal structure. Referring to Figure 1 and Figure 2 , the cross-linked polyethylene insulated power cable terminal structure includes a terminal head 1, a protective sleeve 2 and two clamping rings. Among them, the two clamping rings are respectively a first clamping ring 3 and a second clamping ring 4. The first clamping ring 3 is arranged corresponding to the terminal head 1, and the first clamping ring 3 also correspondingly surrounds the outside of the stress cone 11. The second clamping ring 4 is arranged corresponding to the protective sleeve 2. The two clamping rings are respectively sleeved and clamped at one end of the terminal head 1 and the protective sleeve 2 close to each other, and are respectively used to fix the terminal head 1 and the protective sleeve 2, so that the positions of the terminal head 1 and the protective sleeve 2 on the cable are kept stable.

[0020] To facilitate the disassembly and assembly of the clamping rings, both the first clamping ring 3 and the second clamping ring 4 include two half rings 5. One ends of the two half rings 5 are hinged, and the other ends are connected by fasteners 51, so that the two half rings 5 are closely combined into a complete first clamping ring 3 or second clamping ring 4. In the embodiment of the present application, the fastener 51 can be a combination of a fastening bolt and a fastening nut. After the two half rings 5 clamp the cable, the two half rings 5 are fixed into a complete clamping ring through the combination of the fastening bolt and the fastening nut, so that the first clamping ring 3 clamps one end of the terminal head 1 close to the protective sleeve 2, while the second clamping ring 4 clamps one end of the protective sleeve 2 close to the terminal head 1, so that the terminal head 1 and the protective sleeve 2 are both stably installed on the cable, thereby ensuring the stable operation of the cable terminal.

[0021] Referring to Figures 3 to 6, for facilitating the real-time monitoring of the temperature change at the stress cone 11 inside the terminal head 1 and enabling maintenance personnel to quickly identify it, a temperature indicating element 31 and a temperature sensing module 32 are provided inside the first clamping ring 3. The temperature sensing module 32 can sense the temperature change at the stress cone 11 in real time and display it through the temperature indicating element 31 according to the temperature change situation. Specifically, the temperature sensing module 32 includes a temperature sensing element 321 and a heat conducting element 322. The heat conducting element 322 is made of a metal material with a high heat conduction coefficient, such as copper-aluminum alloy and other materials. Correspondingly, the rest of the first clamping ring 3 can be made of plastic materials such as polypropylene, which is less sensitive to temperature compared with the heat conducting element 322. The outer wall of the heat conducting element 322 is in close contact with the outer wall of the terminal head 1, corresponding to the stress cone 11, and is used to sense the temperature change inside the terminal head 1 at all times. At the same time, the inner wall of the heat conducting element 322 is fixedly connected to the temperature sensing element 321, so that the heat conducting element 322 can transfer heat to the temperature sensing element 321 in time.

[0022] The temperature sensing element 321 can be made of a shape memory alloy material, such as a small-sized nickel-titanium alloy. This shape memory alloy material can shorten at room temperature and elongate when the temperature rises. Its deformation rate of the two-way shape memory effect is as high as 46.15%, and it can work stably in the temperature range from room temperature to 70 °C, enabling the temperature sensing element 321 to deform according to the temperature change. In the embodiment of the present application, the temperature sensing element 321 can be made into a spring-like appearance, so that the temperature sensing element 321 can elongate or shorten along its own length direction when the temperature changes. When the temperature is low, the length of the temperature sensing element 321 correspondingly shortens; when the temperature rises, the length of the temperature sensing element 321 correspondingly elongates.

[0023] The temperature sensing element 321 is arranged perpendicular to the central axis of the clamping ring. One end of the temperature sensing element 321 away from the heat conducting element 322 is fixedly connected to the end of the temperature indicating element 31. The temperature indicating element 31 has a rod-like appearance and is rotationally connected to the inside of the first clamping ring 3 through a rotating shaft, and the axis of the rotating shaft is perpendicular to the length direction of the temperature indicating element 31 and the length direction of the temperature sensing element 321 at the same time. The expansion and contraction of the temperature sensing element 321 can push the temperature indicating element 31 to rotate around the rotating shaft.

[0024] Furthermore, two temperature indicating areas 311 are provided on the side wall of the end of the temperature indicating element 31 away from the temperature sensing element 321, and the two temperature indicating areas 311 have different colors. In the embodiment of the present application, the two temperature indicating areas 311 can be green and red respectively, which are used to indicate "normal temperature" and "high temperature warning" of the terminal head 1 respectively. The two temperature indicating areas 311 are spaced apart on the side wall of the temperature indicating element 31, and along the direction away from the temperature sensing element 321, the colors of the two temperature indicating areas 311 are green and red respectively.

[0025] For the convenience of the temperature display area 311 being able to be displayed outwardly, two observation windows 37 distributed diagonally are provided on the outer wall of the first clamping ring 3. When the temperature indicating member 31 rotates, the temperature display areas 311 thereon are respectively shown outwardly at different observation windows 37, facilitating maintenance personnel to observe the color of the corresponding temperature display area 311 from the observation windows 37, so as to take corresponding maintenance measures. When the temperature is normal, the green temperature display area 311 is aligned with the observation window 37, indicating that the temperature of the terminal head 1 is normal; when the temperature rises to the warning value, the red temperature display area 311 is aligned with the other observation window 37, sending out a high-temperature warning signal to prompt the maintenance personnel to handle it in time to ensure the safe operation of the equipment. In other embodiments of the present application, there may also be three temperature display areas 311 with different colors, respectively indicating "normal temperature", "slightly high temperature" and "high-temperature warning", and the corresponding observation windows 37 are also provided with three distributed diagonally, so that when the temperature indicating member 31 rotates according to the temperature change of the terminal head 1, the temperature state of the terminal head 1 can be displayed outwardly from the three observation windows 37 respectively. The observation window 37 can be a through hole, and a transparent plastic sheet or glass sheet is embedded at the through hole, forming a visible observation window 37 that can observe the temperature indicating member 31 inside the clamping ring while being sealed. The actual size of the observation window 37 opened can be increased or decreased according to the actual size of the first clamping ring 3, so that the observation window 37 can fully display the movement of the temperature indicating member 31 outwardly.

[0026] Since the telescopic amount of the temperature sensing member 321 is limited, the rotation angle of the temperature indicating member 31 pushed by the temperature sensing member 321 is also correspondingly limited. To ensure that the rotation angle of the temperature indicating member 31 is large enough so that different temperature display areas 311 can rotate to the corresponding observation windows 37 for display, the rotating shaft of the temperature indicating member 31 is arranged at one end close to the connection between the temperature indicating member 31 and the temperature sensing member 321, using the lever principle to amplify the limited telescopic amount of the temperature sensing member 321, so that the temperature display area 311 at the other end of the temperature indicating member 31 can rotate more displacement. At the same time, in order to improve the rotation stability of the temperature indicating member 31, a limiting groove 323 is provided on the heat conducting member 322, and the temperature indicating member 31 rotates in the limiting groove 323 of the heat conducting member 322, and the side wall of the temperature indicating member 31 is in sliding contact with the inner wall of the limiting groove 323 of the heat conducting member 322, effectively preventing the temperature indicating member 31 from shifting during rotation.

[0027] The temperature-sensitive component 321 can change its own length according to different temperatures. The heat-conducting component 322 is closely attached to the outside of the stress cone 11. If the terminal head 1 abnormally heats up at the stress cone 11, the heat at the stress cone 11 can be quickly transferred to the heat-conducting component 322, and the heat-conducting component 322 then transfers the heat to the temperature-sensitive component 321, causing the temperature of the temperature-sensitive component 321 to gradually increase. The temperature-sensitive component 321 with an increased temperature elongates along its own length direction, and the elongated temperature-sensitive component 321 drives the temperature-indicating component 31 to rotate along its own rotation axis. During the rotation of the temperature-indicating component 31, the temperature-indicating areas 311 with different colors on the temperature-indicating component 31 rotate accordingly. When the temperature at the stress cone 11 rises to the alarm temperature, the red temperature-indicating area 311 indicating "high-temperature warning" on the temperature-indicating component 31 rotates to correspond to one of the observation windows 37, so that the color for warning on the temperature-indicating area 311 can be revealed outward from the observation window 37, prompting the maintenance personnel to check the terminal head 1 here; when the temperature at the stress cone 11 is normal, the green temperature-indicating area 311 indicating "normal temperature" on the temperature-indicating component 31 rotates to correspond to the other observation window 37, for outwardly indicating that the temperature of the terminal head 1 here is normal, thereby effectively reducing the judgment time of the maintenance personnel.

[0028] Refer to Figures 4 to 6 , a connecting rod 6 is also arranged between the two clamping rings. A locking groove 61 is formed on the side wall of one end of the connecting rod 6 corresponding to the first clamping ring 3. The end of the connecting rod 6 with the locking groove 61 is inserted into the first clamping ring 3, and the other end of the connecting rod 6 is hinged to the second clamping ring 4 through a ball head. A tapered relief groove is formed in the second clamping ring 4 corresponding to the ball head position of the connecting rod 6, so that the connecting rod 6 can conveniently adjust the docking angle. A locking rod 33 is rotatably connected inside the clamping ring. The rotation axis of the locking rod 33 is parallel to the length direction of the temperature-indicating component 31. A locking block 331 is fixed at the end of the locking rod 33 away from the temperature-indicating component 31. The outer shape of the locking block 331 matches the contour of the locking groove 61. When the locking rod 33 rotates, the locking block 331 can be lapped with the locking groove 61, thereby realizing the locking of the first clamping ring 3 and the second clamping ring 4, and combining the first clamping ring 3 and the second clamping ring 4 into a whole.

[0029] Further, a driving block 312 is fixed to one end of the temperature indicating member 31 away from the temperature sensing member 321. The driving block 312 is arc-shaped and is slidably connected to the first clamping ring 3. The driving block 312 is located between the locking rod 33 and the side wall of the clamping ring. An arc-shaped guiding block 34 is fixed to the inner wall of the first clamping ring 3 corresponding to the position of the driving block 312. The driving block 312 is in sliding contact with the arc-shaped guiding block 34, and the arc-shaped guiding block 34 can provide a stable guiding effect for the driving block 312. The side wall of the driving block 312 is in contact with the side wall of the locking rod 33 away from the locking block 331. The thickness of the driving block 312 gradually increases along the extending direction of its own arc. In the embodiment of the present application, the thickness of the driving block 312 gradually increases in the counterclockwise direction. A restoring member 35 is arranged inside the clamping ring. The restoring member 35 can be a compression spring. One end of the restoring member 35 is fixedly connected to the inner wall of the clamping ring, and the other end is fixedly connected to the side wall of the locking block 331.

[0030] Under normal conditions, the restoring member 35 pushes the locking block 331 to always overlap with the locking groove 61, so that the two clamping rings are combined into a whole. At this time, the position with the thinnest thickness of the driving block 312 is between the locking rod 33 and the inner wall of the first clamping ring 3; when the temperature of the terminal head 1 rises, the driving block 312 swings clockwise following the temperature indicating member 31. Since the thickness of the driving block 312 gradually increases in the counterclockwise direction, the part where the thickness of the driving block 312 increases is between the locking rod 33 and the inner wall of the first clamping ring 3, so that the driving block 312 can gradually push the locking rod 33 to rotate. When the temperature of the terminal head 1 rises to the warning temperature, the driving block 312 just pushes the locking rod 33 to rotate until the locking block 331 is completely separated from the locking groove 61. At this time, the first clamping ring 3 is separated from the second clamping ring 4, which is convenient for maintenance personnel to quickly separate the two clamping rings for maintenance. When the temperature of the terminal head 1 returns to normal, the restoring member 35 pushes the locking block 331 to overlap with the locking groove 61 again.

[0031] The two clamping rings are combined into a whole through a connecting rod 6. Each clamping ring respectively clamps the ends of the terminal head 1 and the protective sleeve 2, so that the relative movement between the terminal head 1 and the protective sleeve 2 is minimized, thereby maintaining the stability of the installation position of the terminal head 1. And after the two clamping rings are combined into a whole, they can move together or keep the position fixed as a whole. The two clamping rings can clamp more firmly on the cable; at the same time, the contact area between the clamping ring and the cable is larger, and the clamping force of the clamping ring on the cable is greater, further maintaining the stability of the installation positions of the terminal head 1 and the protective sleeve 2 and reducing the abnormal heating of the cable caused by the loosening of the terminal head 1.

[0032] Further, referring to Figure 6 and Figure 7, a prompting rod 7 is slidably connected inside the side wall of the first clamping ring 3. At the same time, a connecting plate 36 is arranged inside the first clamping ring 3. The connecting plate 36 is arranged corresponding to the position of the locking block 331, and the connecting plate 36 is fixedly connected to the prompting rod 7. A plurality of prompting rods 7 are provided and are evenly spaced on the side wall of the connecting plate 36 away from the locking block 331. One end of the prompting rod 7 penetrates and is slidably connected to the side wall of the first clamping ring 3. A magnetic sheet 361 is fixed on the side wall of the connecting plate 36 close to the prompting rod 7, and an iron sheet is fixed on the inner wall of the first clamping ring 3 corresponding to the position of the magnetic sheet 361. When the locking block 331 moves along with the locking rod 33, it can contact the connecting plate 36 and push the connecting plate 36 together with the prompting rod 7 until one end of the prompting rod 7 is pushed out of the first clamping ring 3. At this time, the magnetic sheet 361 adsorbs to the iron sheet, making the connecting plate 36 closely fit the inner wall of the first clamping ring 3, ensuring that the connecting plate 36 is stable and motionless, and further making one end of the prompting rod 7 remain protruding outside the first clamping ring 3. A fluorescent coating with a striking color is sprayed on the outer wall of the end of the prompting rod 7 protruding outside the first clamping ring 3, which can clearly show outside that the prompting rod 7 has protruded, facilitating maintenance personnel to quickly identify the locking state. Even if the temperature of the terminal head 1 has returned to normal before maintenance, the prompting rod 7 still remains in the protruding state, ensuring that maintenance personnel can accurately judge that the terminal head 1 has reached the warning temperature, so as to timely conduct necessary inspections and maintenance to prevent the occurrence of potential failures.

[0033] Further, a cooling channel 71 is opened inside the prompting rod 7. The cooling channel 71 includes an air inlet 72 and an air outlet 73 that are connected. The air inlet 72 is located inside the first clamping ring 3 and penetrates the connecting plate 36, and the air outlet 73 is opened on the side wall of the prompting rod 7. Under normal circumstances, the air outlet 73 is blocked by the side wall of the first clamping ring 3, separating the cooling channel 71 from the outside; when the temperature of the terminal head 1 rises, the prompting rod 7 slides outwards, making the air outlet 73 communicate with the outside, so that the high temperature inside the first clamping ring 3 can be further discharged through the cooling channel 71. To improve the cooling efficiency, both the prompting rod 7 and the connecting plate 36 can be made of stainless steel with good thermal conductivity.

[0034] The implementation principle of the terminal structure of a cross-linked polyethylene insulated power cable in an embodiment of the present application is as follows: Under normal circumstances, the locking rod 33 is driven by the restoring member 35 to keep the locking block 331 in a state of overlapping with the locking groove 61. At this time, the two clamping rings are combined into a whole, enhancing the fixing effect on the terminal head 1 and the protective sleeve 2. When the temperature at the stress cone 11 rises abnormally, the temperature indicating member 31 drives the driving block 312 to swing, and the driving block 312 gradually drives the locking rod 33 to rotate. At this time, the locking block 331 moves away from the connecting rod 6. When the temperature at the stress cone 11 rises to the temperature that needs to be warned, the driving block 312 just drives the locking block 331 to disengage from the locking groove 61. At this time, the two clamping rings are separated into independent individuals, facilitating the maintenance personnel to remove the clamping rings. At the same time, the indicating rod 7 is pushed out of the first clamping ring 3 under the drive of the locking rod 33. The protruding indicating rod 7 can be used to prompt the maintenance personnel to check the terminal head 1 here. When the temperature at the stress cone 11 returns, the locking block 331 can be driven by the restoring member 35 to overlap with the locking groove 61 again, so that the two clamping rings are combined into a whole again. At this time, the indicating rod 7 still remains protruding, which can also play a role in prompting the maintenance personnel to perform maintenance. Moreover, the temperature inside the first clamping ring 3 can also be discharged through the cooling channel 71 inside the indicating rod 7.

[0035] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A terminal structure of a cross-linked polyethylene insulated power cable, characterized in that: including Clamping rings, two of them are provided. The two clamping rings are respectively used to sleeved and clamp one end of the terminal head and the protective sleeve close to each other to fix the terminal head and the protective sleeve respectively. Each clamping ring includes two half rings. One end of the two half rings is hinged, and the other end is connected by a fastener so that the two half rings are closely combined into a complete clamping ring; A connection module is arranged between the two clamping rings and is used to combine the two clamping rings into a whole; A temperature sensing module is located in one of the clamping rings. The temperature sensing module is arranged corresponding to the stress cone and is used to sense the temperature of the stress cone part in real time; A temperature indicating member is movably arranged in the clamping ring. The temperature sensing module drives the temperature indicating member to move according to the temperature change to externally display the temperature state of the stress cone in real time.

2. The terminal structure of the cross-linked polyethylene insulated power cable according to claim 1, characterized in that: The temperature sensing module includes a temperature sensing member and a heat conducting member. The heat conducting member is closely attached to the outer wall of the terminal head and is arranged corresponding to the stress cone. One end of the temperature sensing member is connected to the heat conducting member, and the other end is connected to the end of the temperature indicating member. The temperature sensing member can expand and contract along its own length direction according to the temperature change to drive the temperature indicating member to move.

3. The cross-linked polyethylene insulated power cable terminal structure according to claim 2, characterized in that: The temperature indicating member is rotatably connected in the clamping ring, and the rotation axis is perpendicular to both the length direction of the temperature indicating member and the length direction of the temperature sensing member at the same time. Two temperature indicating areas with different colors are arranged at intervals along the length direction of the temperature indicating member and are used to correspondingly display different temperature states of the stress cone. Two observation windows are arranged diagonally on the outer wall of the clamping ring. When the temperature indicating member rotates, the temperature indicating areas thereon appear at different observation windows respectively.

4. The cross-linked polyethylene insulated power cable terminal structure according to claim 3, wherein: The temperature indicating member is rotatably connected to the clamping ring through a rotating shaft. The rotating shaft is close to the end where the temperature indicating member is connected to the temperature sensing member, and the temperature indicating area is arranged at the end of the temperature indicating member away from the temperature sensing member.

5. The cross-linked polyethylene insulated power cable terminal structure according to claim 3, characterized in that: The temperature indicating member can drive the connection module to unlock or lock during the rotation process. When the terminal head is in a normal temperature state, the connection module is locked; when the terminal head is in an abnormal temperature state, the temperature indicating member drives the connection module to unlock so that the two clamping rings are independent of each other.

6. The cross-linked polyethylene insulated power cable terminal structure according to claim 5, characterized in that: The connection module includes a connecting rod. A locking groove is arranged on the side wall of one end of the connecting rod. The end of the connecting rod with the locking groove is inserted into the clamping ring provided with the temperature indicating member, and the other end of the connecting rod is hinged to the other clamping ring. A locking rod is rotatably connected in the clamping ring, and the rotation axis of the locking rod is parallel to the length direction of the temperature sensing member. A locking block is arranged at one end of the locking rod. When the temperature indicating member rotates, it can drive the locking rod to rotate so that the locking block is lapped and locked with the locking groove.

7. The terminal structure of the cross-linked polyethylene insulated power cable according to claim 6, characterized in that: A driving block is arranged at the end of the temperature indicating member away from the temperature sensing member. The driving block is arc-shaped and is slidably connected in the clamping ring. The side wall of the driving block is in contact with the end of the locking rod away from the locking block, and the thickness of the driving block gradually increases along the extending direction of its own arc. The driving block is located between the locking rod and the side wall of the clamping ring. A restoring member is arranged inside the clamping ring. One end of the restoring member is connected to the inner wall of the clamping ring, and the other end is connected to the locking block.

8. The cross-linked polyethylene insulated power cable terminal structure according to claim 6, characterized in that: A prompting member is slidably connected in the clamping ring. The prompting member includes a prompting rod and a connecting plate. The connecting plate is located inside the clamping ring and is arranged corresponding to the locking block. A plurality of prompting rods are arranged and evenly spaced on the side wall of the connecting plate away from the locking block. One end of the prompting rod penetrates and is slidably connected to the side wall of the clamping ring. When the locking block moves with the locking rod, it can contact the connecting plate and push the prompting rod out of the clamping ring.

9. The terminal structure of the cross-linked polyethylene insulated power cable according to claim 8, wherein: A cooling channel is provided inside the prompt rod, and the cooling channel includes an air inlet and an air outlet that are connected. The air inlet is located inside the clamping ring and passes through the connecting plate, and the air outlet is provided on the side wall of the prompt rod. When the prompt rod slides, the air outlet is opened or blocked by the side wall of the clamping ring.

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