Flame-retardant crosslinked polyethylene insulated power cable and method for producing the same

Abstract

The application relates to the technical field of cables, in particular to a flame-retardant crosslinked polyethylene insulated power cable and a preparation method thereof, which comprises a cable body and a cable joint, the cable body is composed of conductor assemblies, insulation assemblies, armored assemblies and heat conducting assemblies, the conductor assemblies are three, and the structure of each conductor assembly from inside to outside is composed of a conductor, an inner semiconductive shielding layer, an insulation layer, an outer semiconductive shielding layer, a soft copper belt, a wrapping tape and a sheath. The flame-retardant crosslinked polyethylene insulated power cable and the preparation method thereof have the advantages that after the cable is cut, inert gas is filled into the cable, and after the filling is completed, the two side ports are sealed, a carbonized layer is formed on the crosslinked polyethylene material under high temperature, further flame retardation is achieved, through the arrangement of the heat conducting assemblies, excellent heat dissipation effect of the cable core is achieved, and through the filling of the inert gas in the storage tank, air can be effectively retarded when a fire occurs, and the flame retardation effect is achieved.

Description

Technical Field

[0001] This application relates to the field of cable technology, and in particular to a flame-retardant cross-linked polyethylene insulated power cable and its preparation method. Background Technology

[0002] Power cables are used in the main lines of power systems to transmit and distribute high-power electrical energy, including voltage levels of 1-500KV and above.

[0003] Flame-retardant cables are cables that, in the event of a fire, can contain the flames to a localized area, preventing them from spreading and protecting other equipment, thus avoiding greater damage. Existing cables often lack sufficient heat dissipation in high-temperature environments, making them prone to overheating and damage, and they also lack flame-retardant structures.

[0004] Therefore, this application provides a flame-retardant cross-linked polyethylene insulated power cable and a method for preparing the same. Summary of the Invention

[0005] The purpose of this application is to solve at least one technical problem raised in the background art.

[0006] This application provides a flame-retardant cross-linked polyethylene insulated power cable, including a cable body and a cable joint, wherein the cable body is composed of a conductor assembly, an insulation assembly, an armor assembly and a heat-conducting assembly; There are three conductor assemblies. The structure of each conductor assembly from the inside out is as follows: conductor, inner semiconductor shielding layer, insulating layer, outer semiconducting shield, soft copper strip, wrapping tape and sheath. The insulating component consists of an insulating filler covering the outer surface of the three conductor components. The insulating filler is made of irradiated cross-linked polyethylene material. The armored assembly includes an inner sheath, a galvanized steel wire layer, and a non-woven fabric cushioning layer. The inner sheath surrounds the outer perimeter of the insulating filler, the galvanized steel wire layer is spirally wound around the surface of the inner sheath, and the non-woven fabric cushioning layer is attached to the outside of the galvanized steel wire layer. The heat-conducting components are set inside the filler and are made of copper wire braided mesh, which are evenly distributed on the outer surface of the three conductor components. The inner wall of the filler has a storage tank filled with inert gas.

[0007] By adopting the above technical solution, inert gas permeates into the filler through micropores. During normal operation, the heat-conducting component conducts the heat generated by the cable core to the filler, achieving efficient heat dissipation. In case of fire, the inert gas is released from the storage tank, blocking oxygen and inhibiting combustion. Through the setting of the heat-conducting component, excellent heat dissipation effect for the cable core is achieved. Furthermore, by filling the storage tank with inert gas, it can effectively retard air in case of fire, achieving a flame-retardant effect.

[0008] Preferably, the cable connector consists of a male cable plug and a female cable plug that can be plugged into each other. Insulating protective sleeves are fixedly installed on the surface of both the male and female cable plugs. Wiring sleeves are opened on the opposite sides of both the male and female cable plugs. Threaded holes are opened on the surface of the wiring sleeves, and locking bolts are threaded into the inner wall of the threaded holes.

[0009] By adopting the above technical solution, the conductors at both ends are inserted into the wiring sleeves on the male and female cable plugs respectively, and then the locking bolts are tightened to fix the conductors. Then the male and female cable plugs are connected to each other to realize the transmission of current.

[0010] Preferably, the inner wall of the protective sleeve has a through hole corresponding to the storage tank, and a plug sleeve is fixedly installed at one end of the through hole near the wiring sleeve. The plug sleeve can be inserted into the storage tank, and a sealing groove is provided on the opposite side of the male cable plug and the female cable plug. A sealing ring is provided on the inner wall of the sealing groove.

[0011] By adopting the above technical solution, when the conductors at both ends are inserted into the wiring sleeves on the male and female cable plugs respectively, the insertion sleeves at both ends of the male and female cable plugs will be inserted into the storage slots on the cable bodies at both ends respectively. When the male and female cable plugs are connected to each other, the inert gas can be effectively transferred.

[0012] Preferably, the surface of the cable connector is provided with a forced cutting mechanism. The forced cutting mechanism includes a mounting base fixedly mounted on the surface of the protective sleeve on the male cable plug by bolts, a mounting groove opened in the inner wall of the mounting base, and a nut sleeve rotatably mounted on the inner wall of the mounting base by bearings. The end face of the mounting base is provided with a through hole and two symmetrically arranged guide holes. The through hole and the nut sleeve are on the same central axis. A ball screw is provided on the inner wall of the through hole. The ball screw and the nut sleeve are helically driven. A guide post is slidably fitted on the inner wall of the guide hole. One end of the guide post is provided with a clamping component for clamping the female cable plug. A limit block is fixedly installed on the other end of the guide post and the ball screw.

[0013] Preferably, the surface of the mounting base is provided with a driving component for driving the nut sleeve to rotate. The driving component includes a protective cover fixedly mounted on the surface of the mounting base by bolts, a worm gear rotatably connected to the inner wall of the protective cover, a worm wheel meshing with the worm gear fixedly mounted on the outer surface of the nut sleeve, and a motor for driving the worm gear to rotate fixedly mounted on the surface of the protective cover.

[0014] By adopting the above technical solution, the drive motor can drive the worm to rotate, and the worm wheel meshes with the worm to drive the nut sleeve to rotate. After the nut sleeve and the ball screw are driven by a helical transmission, the ball screw can be moved left and right.

[0015] Preferably, the clamping assembly includes a protective housing fixedly installed at one end of the guide post. The inner wall of the protective housing is provided with a rotating groove and two sliding grooves. The two sliding grooves are symmetrically arranged on both sides of the rotating groove. A spur gear is rotatably connected to the inner wall of the rotating groove. Spur racks that mesh with the spur gears are slidably engaged in the interior of the two sliding grooves. Arc-shaped clamping plates are fixedly installed on the opposite sides of the two spur racks.

[0016] Preferably, one end of the ball screw is fixedly connected to the shaft end of the spur gear.

[0017] By adopting the above technical solution, when the ball screw rotates, it will drive the spur gear to rotate. After the spur gear rotates, it will mesh with the rack and pinion to drive the two racks to move in opposite directions. The two arc-shaped clamps can clamp and release the female cable plug, improving the stability of the male and female cable plugs after they are connected.

[0018] Preferably, two arc-shaped limiting frames are symmetrically fixedly installed on the surface of the protective sleeve on the female cable plug. The inner wall of the arc-shaped limiting frame is provided with a conical groove, and the clamping end of the arc-shaped clamping plate is provided with a conical surface that matches the conical groove.

[0019] By adopting the above technical solution, the sealing ring is placed in the sealing groove opened on the opposite side of the male and female cable plugs. When the two arc-shaped clamps retract, they will enter the arc-shaped limiting frame. The conical surface on the arc-shaped clamps contacts the conical groove in the arc-shaped limiting frame, thereby further locking the male and female cable plugs together and squeezing the sealing ring. The sealing ring can improve the sealing performance between the male and female cable plugs.

[0020] Preferably, the protective sleeve is embedded with a high-precision temperature sensor, and its stainless steel detection end forms a direct contact temperature measurement structure with the conductive surface of the cable plug through a thermally conductive ceramic plate. The temperature signal is transmitted to the central control unit through the Modbus RTU protocol, forming a closed-loop control system with the motor.

[0021] By adopting the above technical solution, when the cable generates high temperature, the temperature sensor will transmit the signal to the external central control unit. The central control unit can drive the motor to rotate, which in turn drives the ball screw to extend, forcing the clamping assembly to disengage the female cable plug from the male cable plug, thereby achieving forced cable cutting. At the same time, when the ball screw rotates, it can drive the spur gear to rotate, thereby forcing the two arc-shaped clamps to separate from each other, allowing the female cable plug to disengage from the arc-shaped clamps, thus preventing the entire cable from burning due to a fire on one side of the female or male cable plug.

[0022] This application also proposes a method for preparing a flame-retardant cross-linked polyethylene insulated power cable, comprising the following steps: Oxygen-free copper rods are continuously drawn and annealed to produce stranded conductors with a nominal cross-sectional area of ​​6-500mm². An internal semiconductor shielding layer is formed through a coating process; The insulating material is heated to a molten state using an extruder and then extruded to coat the conductor, forming an insulating layer. The outer semiconductive shield is manufactured using an inner and outer shielded cable material granulator; The copper wire mesh is spirally wrapped using a longitudinal wrapping machine; The three conductor components are arranged in a triangle and irradiated with an electron accelerator to form a three-dimensional network structure of polyethylene molecules.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The flame-retardant cross-linked polyethylene insulated power cable and its preparation method described in this application, wherein inert gas is filled into the cable after it is cut, and the two ends are sealed after filling. The cross-linked polyethylene material forms a carbonized layer at high temperature, which further retards the flame. Through the setting of the heat-conducting component, excellent heat dissipation effect is achieved for the cable core. Furthermore, by filling the storage tank with inert gas, it can effectively retard the air in the event of a fire, thus achieving a flame-retardant effect.

[0024] 2. The flame-retardant cross-linked polyethylene insulated power cable and its preparation method described in this application utilize a clamping assembly to clamp the female plug of the cable. When the cable generates high temperature, the temperature sensor transmits a signal to the external central control unit. The central control unit can drive the motor to rotate, thereby driving the ball screw to extend and force the clamping assembly to pull the female plug of the cable away from the male plug of the cable, thus achieving forced cable cutting.

[0025] 3. The flame-retardant cross-linked polyethylene insulated power cable and its preparation method described in this application can drive the spur gear to rotate when the ball screw rotates, thereby forcing the two arc-shaped clamps to separate from each other, so that the female plug of the cable is separated from the arc-shaped clamps, thus preventing the entire cable from burning due to a fire on one side of the female plug or male plug of the cable. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the cable body according to an embodiment of this application; Figure 2 This is a schematic diagram of the overall structure of the conductor assembly according to an embodiment of this application; Figure 3 This is a three-dimensional structural diagram of the male cable connector according to an embodiment of this application; Figure 4 This is a schematic diagram of the cable female plug structure according to an embodiment of this application; Figure 5 This is a schematic diagram of the cross-sectional structure of the male cable connector according to an embodiment of this application; Figure 6 This is a three-dimensional first-view structural diagram of the forced cutting mechanism according to an embodiment of this application; Figure 7 This is a three-dimensional second-view structural diagram of the forced cutting mechanism according to an embodiment of this application; Figure 8 This is a schematic cross-sectional view of the forced cutting mechanism according to an embodiment of this application; Figure 9 This is a side sectional view of the protective housing structure according to an embodiment of this application; Figure 10 This is a top-section schematic diagram of the arc-shaped limiting frame according to an embodiment of this application; Figure 11 This is a schematic diagram of the overall structure of an embodiment of this application.

[0027] Explanation of reference numerals in the attached drawings: 100, Cable body; 101, Conductor assembly; 1011, Conductor; 1012, Inner semiconductor shielding layer; 1013, Insulation layer; 1014, Outer semiconducting shield; 1015, Soft copper tape; 1016, Wrapping tape; 1017, Sheath; 102, Insulation assembly; 1021, Storage tank; 103, Armoring assembly; 1031, Inner sheath; 1032, Galvanized steel wire layer; 1033, Non-woven fabric buffer layer; 104, Thermal conductive assembly; 200. Cable connector; 201. Male cable plug; 202. Female cable plug; 203. Protective sleeve; 204. Wiring sleeve; 205. Locking bolt; 206. Gas passage hole; 207. Insert sleeve; 208. Sealing groove; 209. Sealing ring; 300. Forced cutting mechanism; 301. Mounting base; 302. Nut sleeve; 303. Ball screw; 304. Guide column; 305. Limit block; 400. Protective cover; 401. Worm gear; 402. Worm wheel; 403. Motor; 404. Temperature sensor; 405. Thermally conductive ceramic plate; 500. Protective housing; 501. Spur gear; 502. Spur rack; 503. Arc-shaped clamp; 504. Arc-shaped limiting frame; 505. Conical groove. Detailed Implementation

[0028] The following combination Figures 1 to 10 This application will be described in further detail below.

[0029] Example 1 Please refer to the following carefully. Figure 1 and Figure 2A flame-retardant cross-linked polyethylene insulated power cable includes a cable body 100 and a cable joint 200. The cable body 100 is composed of conductor assemblies 101, insulation assemblies 102, armor assemblies 103, and heat-conducting assemblies 104. There are three conductor assemblies 101. The structure of each conductor assembly 101 from the inside out is: conductor 1011, inner semiconductor shielding layer 1012, insulation layer 1013, outer semiconducting shield 1014, soft copper tape 1015, wrapping tape 1016, and sheath 1017. The insulation assembly 102 consists of insulating filler covering the outer surface of the three conductor assemblies 101. The insulating filler is made of... The irradiated cross-linked polyethylene material, the armored assembly 103 includes an inner sheath 1031, a galvanized steel wire layer 1032 and a non-woven fabric buffer layer 1033. The inner sheath 1031 surrounds the insulating filler. The galvanized steel wire layer 1032 is spirally wound on the surface of the inner sheath 1031. The non-woven fabric buffer layer 1033 is attached to the outside of the galvanized steel wire layer 1032. The heat-conducting assembly 104 is disposed in the filler. The heat-conducting assembly 104 is composed of copper wire braided mesh and is evenly distributed on the outer surface of the three conductor assemblies 101. The inner wall of the filler has a storage tank 1021, which is filled with an inert gas, namely nitrogen.

[0030] Specifically, the three sets of conductor components 101 are arranged in a triangle. Inert gas is filled in after the cable is cut, and the two ends are sealed after filling. After the conductor 1011 heats up, the copper wire braided mesh can conduct heat radially. The cross-linked polyethylene material is irradiated to establish a three-dimensional heat conduction network, which improves the thermal conductivity of the insulation layer 1013. Then the heat is axially conducted to the grounding terminal through the galvanized steel wire layer 1032.

[0031] The working principle of this embodiment is as follows: Inert gas permeates into the filler through the micropores of the irradiated cross-linked polyethylene material. During normal operation, the heat-conducting component 104 conducts the heat generated by the cable core to the filler, achieving efficient heat dissipation. In case of fire, the inert gas is released from the storage tank 1021, blocking oxygen and inhibiting combustion. The cross-linked polyethylene material forms a carbonized layer at high temperature, further retardant. Through the setting of the heat-conducting component 104, excellent heat dissipation effect for the cable core is achieved. Furthermore, by filling the storage tank 1021 with inert gas, it can effectively retard air in case of fire, achieving a flame-retardant effect.

[0032] Example 2 Compared with Embodiment 1, another implementation of this application is as follows: Please refer to this carefully. Figures 3 to 8The cable connector 200 consists of a male cable plug 201 and a female cable plug 202 that can be plugged into each other. Insulating protective sleeves 203 are fixedly installed on the surface of both the male cable plug 201 and the female cable plug 202. A terminal sleeve 204 is provided on the opposite side of both the male cable plug 201 and the female cable plug 202. A threaded hole is provided on the surface of the terminal sleeve 204, and a locking bolt 205 is threadedly connected to the inner wall of the threaded hole.

[0033] Specifically, the conductors 1011 at both ends are inserted into the wiring sleeves 204 on the male cable plug 201 and the female cable plug 202, respectively. Then, the locking bolts 205 are tightened to fix the conductors 1011. After that, the male cable plug 201 and the female cable plug 202 are plugged into each other to realize the transmission of current.

[0034] The inner wall of the protective sleeve 203 is provided with a gas channel hole 206 corresponding to the storage tank 1021. A plug sleeve 207 is fixedly installed at one end of the gas channel hole 206 near the wiring sleeve 204. The plug sleeve 207 can be inserted into the storage tank 1021.

[0035] Specifically, when the conductors 1011 at both ends are inserted into the wiring sleeves 204 on the male plug 201 and the female plug 202 of the cable respectively, the insertion sleeves 207 at both ends of the male plug 201 and the female plug 202 of the cable will be inserted into the storage slots 1021 on the cable bodies 100 at both ends respectively. When the male plug 201 and the female plug 202 of the cable are connected to each other, the inert gas can be effectively transferred.

[0036] The surface of the cable connector 200 is provided with a forced cutting mechanism 300. The forced cutting mechanism 300 includes a mounting base 301 fixedly mounted on the surface of the protective sleeve 203 on the male cable plug 201 by bolts, a mounting groove opened in the inner wall of the mounting base 301, and a nut sleeve 302 rotatably mounted on the inner wall of the mounting base 301 by bearings. The end face of the mounting base 301 is provided with a through hole and two symmetrically arranged guide holes. The through hole and the nut sleeve 302 are on the same central axis. The inner wall of the through hole is provided with a ball screw 303, which is screwed to drive the nut sleeve 302. The inner wall of the guide hole is slidably fitted with a guide post 304. One end of the guide post 304 is provided with a clamping component for clamping the female cable plug 202. The other end of the guide post 304 and the ball screw 303 are fixedly installed with a limit block 305.

[0037] The surface of the mounting base 301 is provided with a driving component for driving the nut sleeve 302 to rotate. The driving component includes a protective cover 400 fixedly mounted on the surface of the mounting base 301 by bolts. A worm gear 401 is rotatably connected to the inner wall of the protective cover 400. A worm wheel 402 that meshes with the worm gear 401 is fixedly mounted on the outer surface of the nut sleeve 302. A motor 403 for driving the worm gear 401 to rotate is fixedly mounted on the surface of the protective cover 400. A high-precision temperature sensor 404 is embedded in the protective sleeve 203. Its stainless steel probe end forms a direct contact temperature measurement structure with the conductive surface of the cable male plug 201 through a thermally conductive ceramic plate 405. The temperature signal is transmitted to the central control unit through the Modbus RTU protocol, forming a closed-loop control system with the motor 403.

[0038] Specifically, the drive motor 403 can drive the worm 401 to rotate, and the worm wheel 402 meshes with the worm 401 to drive the nut sleeve 302 to rotate. After the nut sleeve 302 and the ball screw 303 are driven by a helical transmission, the ball screw 303 can be moved left and right.

[0039] The working principle of this embodiment is as follows: the clamping component can clamp the female cable plug 202. When the cable generates high temperature, the temperature sensor 404 will transmit the signal to the external central control unit. The central control unit can drive the motor 403 to rotate, thereby driving the ball screw 303 to extend and force the clamping component to drive the female cable plug 202 to disengage from the male cable plug 201, thereby achieving forced disconnection of the two cables.

[0040] Example 3 Compared with Embodiment 2, another implementation of this application is as follows: Please refer to this carefully. Figure 4 as well as Figures 9 to 11 The clamping assembly includes a protective housing 500 fixedly installed at one end of the guide post 304. The inner wall of the protective housing 500 has a rotating groove and two sliding grooves, symmetrically arranged on both sides of the rotating groove. A spur gear 501 is rotatably connected to the inner wall of the rotating groove. Spur racks 502, meshing with the spur gear 501, are slidably engaged inside the two sliding grooves. Arc-shaped clamping plates 503 are fixedly installed on the opposite sides of the two spur racks 502. The ball screw 303... One end is fixedly connected to the shaft end of the spur gear 501. Two arc-shaped limiting frames 504 are symmetrically fixedly installed on the surface of the protective sleeve 203 on the female cable plug 202. The inner wall of the arc-shaped limiting frame 504 is provided with a conical groove 505. The clamping end of the arc-shaped clamping plate 503 is provided with a conical surface that matches the conical groove 505. The opposite surfaces of the male cable plug 201 and the female cable plug 202 are provided with a sealing groove 208. The inner wall of the sealing groove 208 is provided with a sealing ring 209.

[0041] Specifically, the conical groove 505 has an angle of 45°±1°. When the ball screw 303 rotates, it drives the spur gear 501 to rotate. After the spur gear 501 rotates, it meshes with the rack 502, thereby driving the two racks 502 to move in opposite directions. The two arc-shaped clamps 503 can clamp and release the female cable plug 202, improving the stability of the male cable plug 201 and the female cable plug 202 after they are connected. The sealing ring 209 is placed inside the male cable plug. When the two arc-shaped clamps 503 retract, they enter the arc-shaped limiting frame 504 within the sealing groove 208 on the opposite surfaces of the plug 201 and the female plug 202. The conical surface on the arc-shaped clamp 503 contacts the conical groove 505 in the arc-shaped limiting frame 504, thereby further locking the male plug 201 and the female plug 202 together and compressing the sealing ring 209. The sealing ring 209 can improve the sealing performance between the male plug 201 and the female plug 202.

[0042] The working principle of this embodiment is as follows: when the ball screw 303 rotates to drive the male cable plug 201 and the female cable plug 202 to separate, the spur gear 501 can be driven to rotate, thereby forcing the two arc-shaped clamps 503 to separate from each other, so that the female cable plug 202 is separated from the arc-shaped clamps 503, thus preventing the entire cable from burning due to a fire on one side of the female cable plug 202 or the male cable plug 201.

[0043] This application also proposes a method for preparing a flame-retardant cross-linked polyethylene insulated power cable, comprising the following steps: 1011 stranded conductors with a nominal cross-sectional area of ​​6-500 mm² are manufactured by continuous wire drawing and annealing process using oxygen-free copper rods. An inner semiconductor shielding layer 1012 is formed by a coating process; The insulating material is heated to a molten state using an extruder and then extruded to coat the conductor 1011, forming an insulating layer 1013. The outer semiconductive shield 1014 is manufactured using an inner and outer shielded cable material granulator; The copper wire mesh is spirally wrapped using a longitudinal wrapping machine; The three conductor components 101 are arranged in a triangle and irradiated with an electron accelerator to form a three-dimensional network of polyethylene molecules.

[0044] Working principle: First, strip the conductor 1011 from the cable body 100. Then, insert the conductors 1011 at both ends into the wiring sleeves 204 on the male cable plug 201 and the female cable plug 202 respectively. Tighten the locking bolts 205 to fix the conductors 1011. At this time, the plug sleeves 207 at both ends of the male cable plug 201 and the female cable plug 202 will be inserted into the storage slots 1021 on the cable body 100 at both ends respectively. After conductor 1011 is fixed inside the connector sleeve 204, drive motor 403 rotates forward, driving ball screw 303 to rotate, thereby driving the clamping assembly to move towards the cable male plug 201. Simultaneously, the rotation of ball screw 303 drives spur gear 501 to rotate, thereby driving the two arc-shaped clamping plates 503 to move closer together. When the two arc-shaped clamping plates 503 approach the arc-shaped limit frame 504, they continue to retract and enter the conical groove 505, thus utilizing the arc-shaped clamping plates... The conical surface on 503 contacts the conical groove 505 in the arc-shaped limiting frame 504, which can further lock the male cable plug 201 and the female cable plug 202 together and compress the sealing ring 209. The sealing ring 209 can improve the sealing between the male cable plug 201 and the female cable plug 202. At the same time, when the male cable plug 201 and the female cable plug 202 are plugged into each other, current can be transmitted. Meanwhile, inert gas will pass through the gas channel hole 206 to achieve effective transmission of inert gas. When the cable generates high temperature, the temperature sensor 404 transmits a signal to the external central control unit. The central control unit can drive the motor 403 to rotate in the opposite direction, thereby causing the ball screw 303 to extend and force the clamping assembly to disengage the female cable plug 202 from the male cable plug 201, thus achieving forced disconnection of the two cables. At the same time, when the ball screw 303 rotates, it can drive the spur gear 501 to rotate, thereby forcing the two arc-shaped clamps 503 to separate from each other, allowing the female cable plug 202 to disengage from the arc-shaped clamps 503, preventing the entire cable from burning due to a fire on one side of the female cable plug 202 or the male cable plug 201. It should be noted that during the process of the ball screw 303 extending to disengage the female cable plug 202 from the male cable plug 201, the two arc-shaped clamps 503 will not open excessively and will not disengage from the arc-shaped limit frame 504. After the female cable plug 202 is completely disengaged from the male cable plug 201, the ball screw 303 continues to extend, thereby allowing the arc-shaped clamps 503 to disengage from the female cable plug 202.

[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flame-retardant cross-linked polyethylene insulated power cable, comprising a cable body (100) and a cable joint (200), characterized in that: The cable body (100) is composed of a conductor assembly (101), an insulation assembly (102), an armor assembly (103), and a heat-conducting assembly (104); There are three conductor assemblies (101). The structure of each conductor assembly (101) from the inside out is as follows: conductor (1011), inner semiconductor shielding layer (1012), insulating layer (1013), outer semiconducting shield (1014), soft copper strip (1015), wrapping tape (1016) and sheath (1017). The insulating component (102) is an insulating filler covering the outer surface of the three conductor components (101), and the insulating filler is made of irradiated cross-linked polyethylene material; The armored assembly (103) includes an inner sheath (1031), a galvanized steel wire layer (1032), and a non-woven fabric buffer layer (1033). The inner sheath (1031) surrounds the outer periphery of the insulating filler, the galvanized steel wire layer (1032) is spirally wound on the surface of the inner sheath (1031), and the non-woven fabric buffer layer (1033) is attached to the outside of the galvanized steel wire layer (1032). The heat-conducting component (104) is disposed in the filler. The heat-conducting component (104) is made of copper wire braided mesh and is evenly distributed on the outer surface of the three conductor components (101). The inner wall of the filler is provided with a storage tank (1021) and the storage tank (1021) is filled with inert gas. The cable connector (200) consists of a male cable plug (201) and a female cable plug (202) that can be plugged into each other. Insulating protective sleeves (203) are fixedly installed on the surface of both the male cable plug (201) and the female cable plug (202). A wiring sleeve (204) is provided on the opposite side of both the male cable plug (201) and the female cable plug (202). A threaded hole is provided on the surface of the wiring sleeve (204), and a locking bolt (205) is threadedly connected to the inner wall of the threaded hole. The surface of the cable connector (200) is provided with a forced cutting mechanism (300). The forced cutting mechanism (300) includes a mounting base (301) fixedly mounted on the surface of the protective sleeve (203) on the male cable plug (201) by bolts, a mounting groove opened in the inner wall of the mounting base (301), and a nut sleeve (302) rotatably mounted on the inner wall of the mounting base (301) by bearings. The end face of the mounting base (301) is provided with a through hole and two symmetrically arranged guide holes. The through hole and the nut sleeve (302) are on the same central axis. The inner wall of the through hole is provided with a ball screw (303). The ball screw (303) and the nut sleeve (302) are screw driven. The inner wall of the guide hole is slidably fitted with a guide post (304). One end of the guide post (304) is provided with a clamping component for clamping the female cable plug (202). The other end of the guide post (304) and the ball screw (303) is fixedly installed with a limit block (305). The surface of the mounting base (301) is provided with a driving component for driving the nut sleeve (302) to rotate. The driving component includes a protective cover (400) fixedly mounted on the surface of the mounting base (301) by bolts. The inner wall of the protective cover (400) is rotatably connected to a worm gear (401). The outer surface of the nut sleeve (302) is fixedly mounted with a worm wheel (402) that meshes with the worm gear (401) for transmission. The surface of the protective cover (400) is fixedly mounted with a motor (403) for driving the worm gear (401) to rotate. The clamping assembly includes a protective housing (500) fixedly installed at one end of the guide post (304). The inner wall of the protective housing (500) is provided with a rotating groove and two sliding grooves. The two sliding grooves are symmetrically arranged on both sides of the rotating groove. A spur gear (501) is rotatably connected to the inner wall of the rotating groove. A spur rack (502) that meshes with the spur gear (501) is slidably engaged in the interior of the two sliding grooves. An arc-shaped clamping plate (503) is fixedly installed on the opposite sides of the two spur racks (502).

2. The flame-retardant cross-linked polyethylene insulated power cable according to claim 1, characterized in that, The inner wall of the protective sleeve (203) is provided with a gas channel hole (206) corresponding to the storage tank (1021). A plug sleeve (207) is fixedly installed at one end of the gas channel hole (206) near the wiring sleeve (204). The plug sleeve (207) can be inserted into the storage tank (1021). A sealing groove (208) is provided on the opposite side of the male cable plug (201) and the female cable plug (202). A sealing ring (209) is provided on the inner wall of the sealing groove (208).

3. The flame-retardant cross-linked polyethylene insulated power cable according to claim 1, characterized in that, One end of the ball screw (303) is fixedly connected to the shaft end of the spur gear (501).

4. The flame-retardant cross-linked polyethylene insulated power cable according to claim 1, characterized in that, Two arc-shaped limiting frames (504) are symmetrically fixedly installed on the surface of the protective sleeve (203) on the female cable plug (202). The inner wall of the arc-shaped limiting frame (504) is provided with a conical groove (505), and the clamping end of the arc-shaped clamp (503) is provided with a conical surface that matches the conical groove (505).

5. A flame-retardant cross-linked polyethylene insulated power cable according to claim 1, characterized in that, The protective sleeve (203) is embedded with a high-precision temperature sensor (404). Its stainless steel probe end forms a direct contact temperature measurement structure with the conductive surface of the cable plug (201) through a thermally conductive ceramic plate (405). The temperature signal is transmitted to the central control unit through the Modbus RTU protocol, forming a closed-loop control system with the motor (403).

6. The method for preparing a flame-retardant cross-linked polyethylene insulated power cable according to claim 1, characterized in that, Includes the following steps: Stranded conductors (1011) with a nominal cross-sectional area of ​​6-500 mm² are made by continuous wire drawing and annealing of oxygen-free copper rods. An internal semiconductor shielding layer (1012) is formed by a coating process. The insulating material is heated to a molten state using an extruder and then extruded onto the conductor 1011 to form an insulating layer (1013). The outer semiconductive shield (1014) is manufactured using an inner and outer shielded cable material granulator; The copper wire mesh is spirally wrapped using a longitudinal wrapping machine; The three conductor components (101) are arranged in a triangle and irradiated with an electron accelerator to form a three-dimensional network structure of polyethylene molecules.

Images