High temperature resistant and bending resistant medium voltage cable for electrical appliance control

Abstract

This invention relates to the field of cable technology, and more particularly to a high-temperature resistant and bend-resistant medium-voltage cable for electrical control. The cable includes a heat dissipation mechanism on its outer side and a connecting mechanism at its ends. The inner side of the cable is sequentially provided with a high-temperature resistant insulation layer, a metal shielding layer, a fire-resistant wrapping layer, and a conductor. The cable utilizes a split-type thermally conductive clamp, an arc-shaped thermally conductive pressure seat, and an elastic clamping plate to provide close support to the outer side of the cable, ensuring stable heat conduction and bend resistance under high-temperature and bending conditions. External heat dissipation channels are formed by heat dissipation fins, air guide holes, an L-shaped support rod, a limiting ring, and fan blades, improving the local heat dissipation capacity of the medium-voltage cable. A first connecting sleeve, an L-shaped locking block, a second connecting ring, a spring, a limiting block, a slot, an elastic telescopic sleeve, a support ring, and a sealing ring enable quick connection, elastic locking, and end sealing of the transfer cable, improving the high-temperature resistance, bend resistance, connection reliability, and maintenance convenience of the electrical control circuit.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more particularly to a high-temperature resistant and bend-resistant medium-voltage cable for electrical control. Background Technology

[0002] Medium-voltage cables are commonly used in electrical control systems, electrical cabinets, frequency converters, industrial and mining automation equipment, metallurgical heat treatment equipment, and other applications requiring stable power supply and control transmission. During operation, these cables not only need to withstand high operating voltages and continuous current-carrying heat, but are also susceptible to factors such as equipment vibration, installation bending, maintenance dragging, end-connection, and insufficient heat dissipation in local spaces. When cables are installed in high-temperature areas or near heat-generating electrical components for extended periods, the cable's outer sheath and internal insulation structure are prone to thermal aging, hardening, cracking, or decreased shielding layer contact stability. When cables need to bypass equipment corners or be transferred between control cabinets, pipe racks, and mobile equipment, the bending stress on the outer side of the cable is concentrated, making the end connections more prone to loosening, sealing failure, or poor contact.

[0003] Existing high-temperature resistant cables mostly focus on improving the heat resistance of the cable body through insulation materials, flame-retardant materials, or wrapping layers. Some cables also have flame-retardant layers, heat insulation layers, or support structures to delay the impact of external fire sources. However, for common issues in electrical control sites such as local heat accumulation, frequent end transitions, stress concentration in bending areas, and insufficient sealing at connections, there is still a lack of a comprehensive structure that can simultaneously conduct heat dissipation on the outside of the cable, provide elastic clamping support, and enable quick and reliable end connection. Especially when medium-voltage cables are installed near high-temperature equipment, relying solely on the heat resistance of the cable material itself is insufficient to dissipate local heat in a timely manner, which will still accelerate the aging of the insulation layer after long-term operation. Ordinary clamps or fasteners mostly only have a fixing function and lack insulation, heat conduction, bending resistance, compression, and air cooling functions, which can easily cause stress concentration at the fixing points.

[0004] To address the aforementioned issues, a search revealed a Chinese invention patent with publication number CN118553471A, which discloses a high-temperature resistant flame-retardant cable. The patent states that the cable "includes a cable core, an insulation layer, filler, a flame-retardant layer, and a sheath. A heat insulation component is fitted on the outside of the insulation layer, and a support component is provided at both ends of the multiple heat insulation components. The heat insulation component includes an open ring, and a telescopic tube is slidably connected inside the open ring. A sealing sliding element is provided at the bottom of the telescopic tube. The support component includes a bracket, and multiple slitting components are arranged in a ring array on the bracket." While this solution can improve flame retardant protection through heat insulation components, support components, and slitting components, and provide some response to high-temperature conditions, it mainly targets flame retardancy from fire sources and internal heat insulation protection of cables. It does not include detachable, split-type heat-conducting clamps, insulating heat-conducting pads, arc-shaped heat-conducting pressure seats, and heat dissipation fins on the outside of medium-voltage electrical control cables. It also does not form an external heat dissipation and airflow guiding structure through air guide holes, L-shaped support rods, and fan blades. Furthermore, it does not include a quick-connect sealing structure composed of L-shaped clips, spring limit blocks, slots, elastic expansion sleeves, support rings, and sealing rings at the cable ends. Therefore, there is still room for improvement in terms of local heat dissipation, bending support, quick-installation maintenance at the ends, and connection sealing stability.

[0005] In light of this, in-depth research into the aforementioned issues led to the creation of this case. Summary of the Invention

[0006] The purpose of this invention is to provide a high-temperature resistant and bend-resistant medium-voltage cable for electrical control, in order to solve the problems mentioned in the background art. Existing high-temperature resistant cables mostly focus on improving the heat resistance of the cable body through insulation materials, flame-retardant materials or wrapping layers. Some cables also have flame-retardant layers, heat insulation layers or support structures to delay the impact of external fire sources. However, these cables do not address the common problems in electrical control sites, such as local heat accumulation, frequent end transitions, stress concentration in bending areas, and insufficient sealing and locking at connections.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature resistant and bend-resistant medium-voltage cable for electrical control, comprising a cable, A heat dissipation mechanism is provided on the outside of the cable, and a connection mechanism is provided at the end of the cable; The heat dissipation mechanism includes a split-type thermally conductive clamp, an insulating thermally conductive pad is attached to the inner side of the split-type thermally conductive clamp, an arc-shaped thermally conductive pressure seat is provided on one side of the insulating thermally conductive pad, heat dissipation fins are connected to the outer side of the split-type thermally conductive clamp, an elastic clamping plate is provided on the inner side of the split-type thermally conductive clamp, a locking plate is connected to one side of the split-type thermally conductive clamp, and a threaded hole is opened on one side of the locking plate.

[0008] Preferably, the cable has a high-temperature resistant insulation layer on its inner side, a metal shielding layer on its inner side, a fire-resistant wrapping layer on its inner side, and a wire core on its inner side.

[0009] Preferably, the split-type thermally conductive clamp is configured as two sets of semi-circular structures that cooperate with each other. The split-type thermally conductive clamp is wrapped around the outside of the cable, and the insulating thermally conductive pad is attached between the split-type thermally conductive clamp and the cable.

[0010] Preferably, the arc-shaped heat-conducting pressure seat is disposed on the inner side of the split heat-conducting clamp, and the elastic clamping sheet is disposed on one side of the arc-shaped heat-conducting pressure seat. The elastic clamping sheet is used to elastically fit and press the outer side of the cable.

[0011] Preferably, multiple sets of heat dissipation fins are provided on the outside of the split thermal conductive clamp, and air guide holes are opened inside the heat dissipation fins.

[0012] Preferably, one side of the heat dissipation fin is connected to an L-shaped support rod, a limiting ring is sleeved on the outer side of the L-shaped support rod, and a fan blade is rotatably connected to the inner side of the limiting ring.

[0013] Preferably, the connecting mechanism includes a first connecting sleeve, an L-shaped locking block connected to one side of the first connecting sleeve, a second connecting ring provided at one end of the first connecting sleeve, a connecting groove provided on one side of the second connecting ring, and an adapter cable connected to one end of the second connecting ring.

[0014] Preferably, a connecting block is connected to one side of the first connecting sleeve, a placement groove is provided on one side of the connecting block, a spring is connected to the inner side of the placement groove, a light rod is passed through the inner side of the spring, and a limiting block is sleeved on one end of the light rod.

[0015] Preferably, a fixing block is connected to the outer side of the second connecting ring, an embedding groove is provided on one side of the fixing block, a slot is provided on the inner side of the embedding groove, and the limiting block and the slot are engaged with each other.

[0016] Preferably, one end of the second connecting ring has a slot, an elastic telescopic sleeve is fitted inside the slot, a pressure rod is slidably connected to the inside of the elastic telescopic sleeve, one end of the pressure rod is connected to a bearing ring, and a sealing ring is fitted to one side of the bearing ring.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This high-temperature resistant and bending-resistant medium-voltage cable for electrical control employs a split-type thermally conductive clamp, an insulating thermally conductive pad, an arc-shaped thermally conductive pressure seat, an elastic clamping plate, a locking plate, and threaded holes to form an external clamping support structure. This allows for detachable reinforcement of high-temperature concentrated areas or bending installation areas of the cable without altering the basic layer structure of the cable itself. The split-type thermally conductive clamp facilitates installation from the outside of the cable, the insulating thermally conductive pad provides both thermal conductivity and insulation, the arc-shaped thermally conductive pressure seat increases the contact area with the cable's outer layer, and the elastic clamping plate maintains a tight fit when the cable is subjected to slight bending, vibration, or thermal expansion and contraction. This reduces the problems of localized cable damage or thermal failure due to loosening caused by traditional rigid clamps, thereby improving the bending resistance and thermal stability of the medium-voltage cable in electrical control applications.

[0018] 2. This high-temperature resistant and bending-resistant medium-voltage cable for electrical control employs heat dissipation fins, air guide holes, L-shaped bearing rods, limiting rings, and fan blades to form an external heat dissipation and airflow guiding structure. It also utilizes a first connecting sleeve, L-shaped locking block, second connecting ring, connecting groove, spring, smooth rod, limiting block, fixing block, slot, elastic telescopic sleeve, pressure rod, bearing ring, and sealing ring to form an end quick-install sealing structure. Multiple sets of heat dissipation fins increase the heat dissipation area, and the air guide holes and fan blades improve local airflow, making it easier for the cable to dissipate heat when used near continuously current-carrying or high-temperature equipment. The connection mechanism allows for quick positioning of the cable and adapter cable via the L-shaped locking block and connecting groove, followed by locking via the elastic engagement of the limiting block and slot. The sealing ring provides end sealing compensation, reducing loosening, dust ingress, moisture ingress, and unstable contact at the connection point, thus improving cable connection reliability, maintenance convenience, and long-term operational safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cable cross-section structure of the present invention; Figure 3 This is a schematic diagram of the installation structure of the heat dissipation mechanism of the present invention; Figure 4 This is a schematic diagram of the exploded structure of the split-type heat-conducting clamp of the present invention; Figure 5 This is a schematic diagram of the structure of the heat dissipation fins used in conjunction with the fan blades of the present invention; Figure 6 This is a schematic diagram of the overall structure of the connecting mechanism of the present invention; Figure 7 This is a partial structural diagram of the connection mechanism of the present invention; Figure 8 For the present invention Figure 6 Enlarged structural diagram at point A in the middle; Figure 9 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 10 This is another schematic diagram of the fitting structure of the embedding groove and the card slot of the present invention.

[0020] In the diagram: 1. Cable; 2. Heat dissipation mechanism; 201. Split-type thermal conductive clamp; 202. Insulating thermal conductive pad; 203. Arc-shaped thermal conductive pressure seat; 204. Heat dissipation fins; 205. Air duct; 206. Elastic clamping plate; 207. Locking plate; 208. Threaded hole; 209. L-shaped support rod; 210. Limiting ring; 211. Fan blade; 3. Connecting mechanism; 301. First connecting sleeve; 302. L-shaped locking block; 303. Second connecting sleeve. 304. Ring; 305. Connecting groove; 306. Adapter cable; 307. Connecting block; 308. Placement groove; 309. Spring; 310. Smooth rod; 311. Limiting block; 312. Fixing block; 313. Embedding groove; 314. Card slot; 315. Elastic telescopic sleeve; 316. Pressure rod; 317. Bearing ring; 318. Sealing ring; 4. High temperature resistant insulation layer; 5. Metal shielding layer; 6. Fire resistant wrapping layer; 7. Wire core. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-10 This invention provides a technical solution: a high-temperature resistant and bend-resistant medium-voltage cable for electrical control, comprising cable 1, A heat dissipation mechanism 2 is provided on the outside of cable 1, and a connection mechanism 3 is provided at the end of cable 1; The heat dissipation mechanism 2 includes a split-type thermally conductive clamp 201. An insulating thermally conductive pad 202 is attached to the inner side of the split-type thermally conductive clamp 201. An arc-shaped thermally conductive pressure seat 203 is provided on one side of the insulating thermally conductive pad 202. A heat dissipation fin 204 is connected to the outer side of the split-type thermally conductive clamp 201. An elastic clamping plate 206 is provided on the inner side of the split-type thermally conductive clamp 201. A locking plate 207 is connected to one side of the split-type thermally conductive clamp 201. A threaded hole 208 is opened on one side of the locking plate 207. The split-type thermally conductive clamp 201 facilitates the formation of a detachable heat dissipation support structure on the outside of the cable 1. The locking plate 207 and the threaded hole 208 facilitate the locking of the two sets of split-type thermally conductive clamps 201 to the outside of the cable 1.

[0023] Furthermore, a high-temperature resistant insulation layer 4 is provided on the inner side of the cable 1, a metal shielding layer 5 is provided on the inner side of the high-temperature resistant insulation layer 4, a fire-resistant wrapping layer 6 is provided on the inner side of the metal shielding layer 5, and a wire core 7 is provided on the inner side of the fire-resistant wrapping layer 6. The high-temperature resistant insulation layer 4 can improve the heat resistance of the outer layer of the cable 1. The metal shielding layer 5 can reduce the impact of external electromagnetic interference on the stability of signal or power transmission of the wire core 7. The fire-resistant wrapping layer 6 can form fire-resistant isolation on the outside of the wire core 7.

[0024] Furthermore, the split-type thermally conductive clamp 201 is configured as two sets of semi-circular structures that cooperate with each other. The split-type thermally conductive clamp 201 is wrapped around the outside of the cable 1, and the insulating thermally conductive pad 202 is attached between the split-type thermally conductive clamp 201 and the cable 1. Through the configuration of the two sets of semi-circular structures, the heat dissipation mechanism 2 can be installed by wrapping around the outside of the cable 1 without having to pass through the cable end, which is convenient for installation on existing cable lines. The setting of the insulating thermally conductive pad 202 can reduce the wear and insulation risks caused by direct contact between metal parts and the outer layer of the cable 1.

[0025] Furthermore, the arc-shaped heat-conducting pressure seat 203 is disposed on the inner side of the split heat-conducting clamp 201, and the elastic clamping plate 206 is disposed on one side of the arc-shaped heat-conducting pressure seat 203. The elastic clamping plate 206 is used to elastically press and clamp the outer side of the cable 1. By setting the arc-shaped heat-conducting pressure seat 203, the contact area between the split heat-conducting clamp 201 and the outer side of the cable 1 can be increased. By setting the elastic clamping plate 206, flexible clamping compensation can be formed on the cable 1, so that the cable 1 can still maintain stable contact during slight bending or thermal expansion and contraction.

[0026] Furthermore, multiple sets of heat dissipation fins 204 are provided on the outside of the split thermal conductive clamp 201, and air guide holes 205 are provided inside the heat dissipation fins 204. By providing heat dissipation fins 204, the area of ​​the outside of the split thermal conductive clamp 201 in contact with air can be increased. By providing air guide holes 205, air can pass through the gaps between the heat dissipation fins 204, reducing heat retention.

[0027] Furthermore, an L-shaped support rod 209 is connected to one side of the heat dissipation fin 204. A limiting ring 210 is sleeved on the outer side of the L-shaped support rod 209, and a fan blade 211 is rotatably connected to the inner side of the limiting ring 210. The L-shaped support rod 209 provides installation support for the limiting ring 210 and the fan blade 211. The fan blade 211 can rotate or turbulent under the influence of natural wind, equipment vibration, or hot airflow, making the airflow near the heat dissipation fin 204 more sufficient.

[0028] Furthermore, the connecting mechanism 3 includes a first connecting sleeve 301, an L-shaped locking block 302 connected to one side of the first connecting sleeve 301, a second connecting ring 303 provided at one end of the first connecting sleeve 301, a connecting groove 304 opened on one side of the second connecting ring 303, and a converter cable 305 connected to one end of the second connecting ring 303. Through the arrangement of the first connecting sleeve 301 and the second connecting ring 303, the end connection between the cable 1 and the converter cable 305 can be realized. Through the arrangement of the L-shaped locking block 302 and the connecting groove 304, insertion pre-positioning can be formed in the initial stage of connection, reducing docking misalignment.

[0029] Furthermore, a connecting block 306 is connected to one side of the first connecting sleeve 301, and a placement groove 307 is provided on one side of the connecting block 306. A spring 308 is connected to the inner side of the placement groove 307, and a smooth rod 309 is passed through the inner side of the spring 308. A limiting block 310 is sleeved on one end of the smooth rod 309. The placement groove 307 provides extension and retraction space for the spring 308, the smooth rod 309 and the limiting block 310. The smooth rod 309 restricts the movement direction of the limiting block 310 and reduces the deviation of the limiting block 310 during extension and retraction.

[0030] Furthermore, a fixing block 311 is connected to the outer side of the second connecting ring 303. An embedding groove 312 is provided on one side of the fixing block 311, and a locking groove 313 is provided on the inner side of the embedding groove 312. The limiting block 310 and the locking groove 313 are engaged with each other. By setting the embedding groove 312, the connecting block 306 can be guided into the inner side of the fixing block 311. By setting the locking groove 313, the limiting block 310 can be automatically engaged and locked under the action of the spring 308.

[0031] Furthermore, a slot 314 is provided at one end of the second connecting ring 303, and an elastic telescopic sleeve 315 is fitted inside the slot 314. A pressure rod 316 is slidably connected to the inner side of the elastic telescopic sleeve 315. A bearing ring 317 is connected to one end of the pressure rod 316, and a sealing ring 318 is attached to one side of the bearing ring 317. The slot 314 provides an installation position for the elastic telescopic sleeve 315. The pressure rod 316 and the bearing ring 317 continuously compress the sealing ring 318, so that the connecting mechanism 3 has a sealing compensation effect after docking.

[0032] Working principle: First, when the high-temperature resistant and bend-resistant medium-voltage cable used for electrical control is put into use, the conductor 7 bears the transmission of medium-voltage electrical energy or control signals. The fire-resistant wrapping layer 6, the metal shielding layer 5, and the high-temperature resistant insulation layer 4 sequentially form fire-resistant isolation, shielding protection, and high-temperature insulation protection on the outside of the conductor 7, enabling the cable 1 to adapt to electrical control cabinets, heat treatment equipment, frequency converter control equipment, or other high-temperature electrical environments. When the cable 1 is laid near heating elements, bending corners, or areas of stress at the ends, the two sets of separate thermally conductive clamps 201 are installed together from the outside of the cable 1. The insulating thermally conductive pad 202 first contacts the outside of the cable 1, transferring the heat from the surface of the cable 1 to the separate thermally conductive clamps 201, while avoiding direct wear or damage to the outer layer of the cable by the metal clamps. Locking is then achieved through locking plate 207 and threaded hole 208. Arc-shaped heat-conducting pressure seat 203, along with split-type heat-conducting clamp 201, is close to the outside of cable 1. Elastic clamping plate 206 provides continuous flexible compression to cable 1, ensuring that cable 1 remains in close contact for heat conduction and support even during slight bending, vibration, or thermal expansion and contraction. This prevents localized suspension, loosening, or stress concentration at the fixing point of cable 1. When cable 1 continuously carries current and generates heat, the heat is transferred from the outside of cable 1 through insulating heat-conducting pad 202 to split-type heat-conducting clamp 201, and then to multiple sets of heat dissipation fins 204. The heat dissipation fins 204 expand the heat dissipation area, and the air guide hole 205 provides a channel for airflow through the heat dissipation fins 204. Under the influence of equipment operating vibration, on-site natural wind, or rising hot airflow, the heat dissipation fins 204 provide a suitable environment for heat dissipation. The fan blades 211 inside the limiting ring 210 can rotate or turbulent around the L-shaped support rod 209, allowing hot air around the heat dissipation fins 204 to be discharged more quickly, thereby reducing local heat accumulation in the cable 1 and delaying the aging of the high-temperature insulation layer 4 and internal structure. When the cable 1 needs to be connected to the adapter cable 305, the first connecting sleeve 301 and the second connecting ring 303 are brought close to each other, so that the L-shaped locking block 302 enters the connecting groove 304 to complete the initial positioning. The connecting block 306 enters the embedding groove 312 of the fixing block 311 along with the first connecting sleeve 301. Under the action of the edge of the embedding groove 312, the limiting block 310 first compresses the spring 308 and retracts along the smooth rod 309. When the first connecting sleeve 301 and the second connecting ring 303 are in place, the spring 308 pushes... The movable limit block 310 extends into the slot 313 to complete the locking, preventing the end of cable 1 and the adapter cable 305 from loosening due to vibration, pulling, or bending. Simultaneously, the elastic telescopic sleeve 315 in the slot 314 drives the pressure rod 316 and the bearing ring 317 to compress and compensate the sealing ring 318, ensuring a tight seal even with slight machining errors, thermal expansion and contraction, or vibration at the connection end faces. This reduces the entry of dust, moisture, and high-temperature airflow into the connection gap. When maintenance or replacement of the adapter cable 305 is required, external force is used to push the limit block 310 out of the slot 313. The spring 308 is compressed, releasing the lock, and the first connecting sleeve 301 can then separate from the second connecting ring 303. Throughout the entire operation, the heat dissipation mechanism 2 primarily undertakes external heat conduction and dissipation, as well as bending resistance support.The connecting mechanism 3 primarily handles rapid end positioning, elastic locking, and sealing compensation. Together, these mechanisms improve the high-temperature resistance, bending resistance, connection reliability, and ease of maintenance of medium-voltage cables in electrical control environments.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature resistant and bend-resistant medium-voltage cable for electrical control, comprising a cable (1), characterized in that: A heat dissipation mechanism (2) is provided on the outside of the cable (1), and a connection mechanism (3) is provided at the end of the cable (1). The heat dissipation mechanism (2) includes a split-type thermally conductive clamp (201), an insulating thermally conductive pad (202) is attached to the inner side of the split-type thermally conductive clamp (201), an arc-shaped thermally conductive pressure seat (203) is provided on one side of the insulating thermally conductive pad (202), a heat dissipation fin (204) is connected to the outer side of the split-type thermally conductive clamp (201), an elastic clamping sheet (206) is provided on the inner side of the split-type thermally conductive clamp (201), a locking plate (207) is connected to one side of the split-type thermally conductive clamp (201), and a threaded hole (208) is opened on one side of the locking plate (207).

2. The high-temperature resistant and bending-resistant medium-voltage cable for electrical control according to claim 1, characterized in that: The cable (1) has a high-temperature resistant insulation layer (4) on its inner side, a metal shielding layer (5) on its inner side, a fire-resistant wrapping layer (6) on its inner side, and a wire core (7) on its inner side.

3. A high-temperature resistant and bending-resistant medium-voltage cable for electrical control according to claim 1, characterized in that: The split-type thermally conductive clamp (201) is configured as two sets of semi-circular structures that cooperate with each other. The split-type thermally conductive clamp (201) is wrapped around the outside of the cable (1), and the insulating thermally conductive pad (202) is attached between the split-type thermally conductive clamp (201) and the cable (1).

4. A high-temperature resistant and bend-resistant medium-voltage cable for electrical control according to claim 1, characterized in that: The arc-shaped heat-conducting pressure seat (203) is located on the inner side of the split heat-conducting clamp (201), and the elastic pressing plate (206) is located on one side of the arc-shaped heat-conducting pressure seat (203). The elastic pressing plate (206) is used to elastically press and tighten the outer side of the cable (1).

5. A high-temperature resistant and bend-resistant medium-voltage cable for electrical control according to claim 1, characterized in that: Multiple sets of heat dissipation fins (204) are provided on the outside of the split heat-conducting clamp (201), and air guide holes (205) are opened inside the heat dissipation fins (204).

6. A high-temperature resistant and bend-resistant medium-voltage cable for electrical control according to claim 5, characterized in that: One side of the heat dissipation fin (204) is connected to an L-bearing rod (209), and a limiting ring (210) is sleeved on the outer side of the L-bearing rod (209). A fan blade (211) is rotatably connected to the inner side of the limiting ring (210).

7. A high-temperature resistant and bend-resistant medium-voltage cable for electrical control according to claim 1, characterized in that: The connecting mechanism (3) includes a first connecting sleeve (301), an L-shaped card block (302) is connected to one side of the first connecting sleeve (301), a second connecting ring (303) is provided at one end of the first connecting sleeve (301), a connecting groove (304) is provided on one side of the second connecting ring (303), and a converter cable (305) is connected to one end of the second connecting ring (303).

8. A high-temperature resistant and bend-resistant medium-voltage cable for electrical control according to claim 7, characterized in that: A connecting block (306) is connected to one side of the first connecting sleeve (301). A placement groove (307) is provided on one side of the connecting block (306). A spring (308) is connected to the inside of the placement groove (307). A light rod (309) is passed through the inside of the spring (308). A limiting block (310) is sleeved on one end of the light rod (309).

9. A high-temperature resistant and bend-resistant medium-voltage cable for electrical control according to claim 7 or 8, characterized in that: The second connecting ring (303) is connected to a fixing block (311) on the outside. An embedding groove (312) is provided on one side of the fixing block (311), and a card slot (313) is provided on the inner side of the embedding groove (312). The limiting block (310) and the card slot (313) are engaged with each other.

10. A high-temperature resistant and bend-resistant medium-voltage cable for electrical control according to claim 7, characterized in that: The second connecting ring (303) has a slot (314) at one end, and an elastic telescopic sleeve (315) is fitted inside the slot (314). A pressure rod (316) is slidably connected inside the elastic telescopic sleeve (315). A bearing ring (317) is connected to one end of the pressure rod (316), and a sealing ring (318) is attached to one side of the bearing ring (317).

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