A medium-voltage cable that is easy to connect

Abstract

This invention discloses a medium-voltage cable that is easy to connect, relating to the field of power cable technology. It includes a cable body with several cable cores installed at equal angles along the circumference inside. An inner sleeve is installed inside the cable body, and an air bladder is installed inside the inner sleeve. Several rings are evenly and equidistantly installed on the outer wall of the inner sleeve, and several branch rings are evenly and equidistantly installed on both sides of each ring. Several conduits are evenly and equidistantly connected to the outer curved surface of the air bladder. This invention can achieve dual dispersion and buffering of external impact pressure, enabling the cable to adapt to harsher and more complex external environments. It can transform external impact force into a defensive force that inhibits further deformation of the cable body, preventing external impact force from being directly applied to the cable cores, giving the cable an automatic shape repair capability, avoiding direct rigid pulling on the cable body, and dispersing external tensile force and bending stress along the cable radially, achieving more comprehensive and reliable protection for the cable cores.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, specifically to a medium-voltage cable that is easy to connect. Background Technology

[0002] Medium-voltage cables refer to power cables with rated voltages between 1kV and 35kV. They are mainly used for transmitting and distributing electrical energy in power distribution systems. Their structure typically includes conductors, insulation layers, shielding layers, and outer sheaths. They need to have good insulation performance, mechanical strength, and environmental adaptability. They are widely used in urban power grids, industrial power distribution, commercial buildings, and other scenarios.

[0003] However, current power cables mostly rely on thick insulating rubber wrapping around the cable core to enhance the cable's mechanical properties. Due to the lack of targeted compression and tensile strength design, the improvement in the cable's mechanical properties is limited, making the cable prone to breakage and damage during use, affecting insulation performance. The cable core is also prone to deformation, affecting the stability of power transmission and making it unable to adapt to complex external operating environments. Summary of the Invention

[0004] This invention provides a medium-voltage cable that is easy to connect, which can effectively solve the problems mentioned in the background art. Current power cables mostly rely on thick insulating rubber to wrap the cable core to enhance the mechanical properties of the cable. Due to the lack of targeted compression and tensile design, the improvement of the mechanical properties of the cable is limited, which leads to the cable being prone to breakage and damage during use, affecting the insulation performance. The cable core is also prone to deformation, affecting the stability of power transmission and making it unable to adapt to complex external use environments.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a medium-voltage cable that is easy to connect, comprising a cable body, wherein a plurality of cable cores are installed at equal angles along the circumferential direction inside the cable body, and a main protective mechanism is installed inside the cable body.

[0006] The main protective mechanism includes an internal sleeve;

[0007] An inner sleeve is installed inside the cable body, an airbag is installed inside the inner sleeve, several ring strips are evenly installed at equal intervals on the outer wall of the inner sleeve, several support rings are evenly installed at equal intervals on both sides of the ring strips, several conduits are evenly connected at equal intervals on the outer curved surface of the airbag, a box is installed at one end of the inner sleeve, several tie rods are slidably installed at equal angles along the circumferential direction on the side end face of the box, an arc plate is installed at one end of the tie rods, and several connecting pipes are connected at equal angles along the circumferential direction on one side of the inner wall of the box.

[0008] The airbag has a tube installed inside, and several round boxes are evenly installed on the curved surface of the tube at equal intervals. A rotating head is installed inside the round box, and a rotating shaft is installed at the end of the rotating head. A collar is installed at the end of the rotating shaft, and a core sleeve is installed inside the collar. The bottom of the round box has symmetrical through holes, and an inner tube is installed at the end of the through hole.

[0009] Preferably, an insulating sleeve is fitted onto the outer wall of the cable core, a shielding mesh is embedded in the outer wall of the insulating sleeve, and a shielding sleeve is embedded in the inner wall of the cable core.

[0010] Preferably, the support ring is in the shape of a ring sawtooth, and the support ring, cable body, inner sleeve and ring bar surround a number of protective cavities along the radial direction of the cable body. The airbag is connected to the protective cavity through a conduit, and both the airbag and the protective cavity are filled with sulfur hexafluoride.

[0011] Preferably, a partition plate is installed inside the box at both sides of the arc plate, and the arc plate and the partition plate fit together. The length of the partition plate is less than the length of the inner cavity of the box, and the sum of the length of the partition plate and the thickness of the arc plate is greater than the length of the inner cavity of the box. An annular pad is installed at the other end of the tie rod, and a protective tube is sleeved on the outside of the tie rod. The outer diameter of the tie rod is less than the inner diameter of the protective tube, and the protective tube passes through the annular strip.

[0012] Preferably, an isolation plate is provided on one side of the inner wall of the round box, the rotating head and the isolation plate divide the inner cavity of the round box into two chambers, and the through holes on both sides of the rotating head are respectively connected to the two chambers. The two ends of the inner tube are respectively connected to two through holes at the position between two adjacent rotating heads, and the inner cavity of the box is connected to the through hole closest to the box body through a connecting pipe. Both the box body and the interior of the round box are filled with insulating oil.

[0013] Preferably, the insulating sleeve is located inside the core sleeve and fits into the core sleeve. The outer wall of the core sleeve has a ring groove at the position corresponding to the collar, and the collar fits into the ring groove. The gaps between the core sleeve, the tube body, and the inner sleeve are all filled with air bladders. The cable core is serrated along the radial direction of the cable body in the initial state.

[0014] Preferably, a self-locking on / off connection mechanism is installed at the end of the cable body;

[0015] The self-locking on / off connection mechanism includes a sealing head;

[0016] Both ends of the cable are equipped with sealing heads. A ring shell is installed on one side of the inner curved surface of the sealing head. Ring ribs are installed on both sides of the outer curved surface of the cable. An air cushion is embedded in the inner curved surface of the ring shell. A protrusion is installed at one end of the sealing head and a recess is installed at the other end of the sealing head. A sealing sleeve is fitted on the outside of the protrusion and the recess.

[0017] The end of the protruding seat is slidably embedded with several tubes at equal angles along the circumferential direction. One end of each tube is fitted with an annular plate inside the protruding seat, and the other end of each tube is fitted with a plug. An expansion sleeve is embedded in the outer wall of the plug. An inner groove is formed on one side of the inner wall of the protruding seat. An insertion hole is formed at the end of the concave seat corresponding to the position of the plug. An annular groove is formed inside the concave seat at the end of the insertion hole. Flow channels are formed inside the sealing head at the edges of the annular groove and the edges of the protruding seat.

[0018] One of the sealing heads has several sockets embedded at equal angles along the circumference at the end of the protrusion, and the other sealing head has several plugs embedded at equal angles along the circumference at the end of the recess. Both the plugs and sockets have conductive cylinders installed at their ends.

[0019] Preferably, the inner wall of the sealing head and the annular shell form an air cavity. The inner cavity of the protrusion and the annular groove are respectively connected to the air cavities on the two sealing heads through two flow channels, and the air cavities are connected to the inner cavity of the air cushion. An air valve is embedded and installed at the position corresponding to the flow channel on the outer curved surface of the sealing head. A safety valve is installed on one side of the end of the protrusion. The inner cavity of the protrusion is connected to the inner space of the protrusion through the inner groove, and the inner groove and the insertion tube are respectively located on both sides of the annular plate.

[0020] Preferably, a plurality of sealing strips are evenly and equidistantly installed on the outer wall of the convex seat, the outer wall of the concave seat, and the inner wall of the sealing sleeve. The convex seat and the concave seat fit into the sealing sleeve. The outer curved surface of the expansion sleeve is evenly and equidistantly provided with a plurality of grooves. The inner wall of the insertion hole is evenly and equidistantly installed with a plurality of convex pads. The convex pads fit into the grooves. The plug fits into the insertion hole. The inner cavity of the plug is connected to the inner cavity of the expansion sleeve.

[0021] Preferably, the socket and the plug are fitted together, and both the socket and the plug are connected to the cable core through a conductive cylinder, wherein the conductive cylinder, the socket and the plug are all conductive structures.

[0022] Compared with the prior art, the advantages of the present invention are: the present invention has a scientific and reasonable structure and is safe and convenient to use;

[0023] 1. Equipped with a main protective structure, the cable can form a pressure-resistant isolation structure through the combination of built-in sleeves, airbags, rings, support rings, and conduits. This effectively improves the cable's adaptability to complex external environments. On the one hand, it can achieve dual dispersion and elimination of external impact pressure, improving the cable's pressure resistance while effectively solving the problem of stress concentration when the cable is subjected to external impact. This effectively reduces the probability of cable breakage under external impact, allowing the cable to adapt to harsher and more complex external environments. On the other hand, it can transform external impact stress into internal support force within the cable body, converting external impact force into a defensive force that inhibits further deformation of the cable body. This not only isolates the impact force from the cable core, preventing external impact force from being directly applied to the cable core and significantly improving the protection effect of the cable core and reducing the probability of cable core deformation, but also transforms external impact force into internal air pressure energy within the cable, giving the cable the ability to automatically repair its shape.

[0024] By combining the box body, arc plate, tie rod, connecting pipe, tube body, round box, rotating head, rotating shaft, collar, through hole and inner tube, a tensile-resistant cable laying structure can be formed. With the limiting constraint of the core sleeve, the external tensile force and bending stress can be transformed into driving force to actively and equivalently lay the cable core. This not only makes the cable core more adaptable to the deformation and expansion process of the cable under the action of external tensile and bending stress, avoiding the cable body from being directly and rigidly stretched, but also disperses the external tensile force and bending stress along the radial direction of the cable and further converts it into the internal pressure energy of the air cushion, which greatly improves the stability of the internal structure of the cable. With the addition of a pressure-resistant isolation structure, more comprehensive and reliable protection of the cable core can be achieved, which greatly improves the overall mechanical performance of the cable.

[0025] 2. Equipped with a self-locking on / off connection mechanism, the sealing head, convex seat, concave seat, sealing sleeve, ring shell, ring rib, and air cushion work together to form a sealed connection structure, which can effectively improve the sealing performance of the cable joint. In addition, the flow-limiting and guiding effects of the insertion tube, ring plate, plug cylinder, expansion sleeve, inner groove, insertion hole, circulation groove, and flow channel can form a self-locking protection mechanism, which can recover and convert the heat dissipated during the use of the cable. On the one hand, the heat dissipated during the use of the cable can be converted into connection stress at the cable joint, which simultaneously improves the sealing performance and connection stability at the joint during the use of the cable. It also makes the connection stress at the cable joint adjustable, transforming the rigid connection into an elastic self-locking connection, solving the problem that the cable joint is prone to loosening and falling off under external force disturbance, enhancing the working stability and safety of the cable. It can also be used in conjunction with the main protection mechanism to further enhance the overall mechanical strength of the cable during use.

[0026] On the other hand, it can be used with conductive cylinder sockets and plugs to transform the heat dissipated during cable use into a self-protection driving force. It can actively cut off the connection between cables in the event of cable overload or short circuit, forming a real-time protection switching mechanism. This can more efficiently and stably isolate faulty cables, not only effectively enhancing the timeliness and effectiveness of self-protection at the joints during cable use, but also effectively preventing the spread of faults during cable use. This can effectively reduce cable fault losses and subsequent cable maintenance costs. At the same time, automatically cutting off the connection of faulty cables can more quickly identify the fault point, greatly reducing the difficulty of maintenance and making the subsequent use of cables more stable and reliable. In addition, it can achieve gaseous protection at the joints, improve the insulation and electromagnetic shielding effect at the joints, and reduce arc damage.

[0027] In summary, this cable possesses targeted anti-compression, anti-pull-out, and anti-bending protection mechanisms, enabling more comprehensive elastic protection of the cable core, significantly enhancing the cable's compressive and tensile strength, simultaneously reducing the probability of cable breakage and conductor deformation, improving the stability of cable power transmission, and greatly enhancing the stability and reliability of cable connections. It also features a self-shutdown protection mechanism, which can effectively isolate faulty cables in a timely manner, preventing the spread of cable faults. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0029] In the attached diagram:

[0030] Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the cable core installation structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the main protective mechanism of the present invention;

[0033] Figure 4 This is a schematic diagram of the arc plate mounting structure of the present invention;

[0034] Figure 5 This is a schematic diagram of the collar mounting structure of the present invention;

[0035] Figure 6 This is a schematic diagram of the rotating head mounting structure of the present invention;

[0036] Figure 7 This is a schematic diagram of the self-locking on / off connection mechanism of the present invention;

[0037] Figure 8 This is a schematic diagram of the cannula installation structure of the present invention;

[0038] Figure 9 This is a schematic diagram of the recessed mounting structure of the present invention;

[0039] The diagram is labeled as follows: 1. Cable body; 11. Cable core; 12. Insulation sleeve; 13. Shielding mesh; 14. Shielding sleeve.

[0040] 200. Main protective mechanism; 201. Internal sleeve; 202. Airbag; 203. Ring bar; 204. Support ring; 205. Conduit; 206. Box body; 207. Arc plate; 208. Tie rod; 209. Connecting pipe; 210. Pipe body; 211. Round box; 212. Rotating head; 213. Rotating shaft; 214. Collar; 215. Core sleeve; 216. Through hole; 217. Inner tube;

[0041] 20. Protective cavity; 21. Partition plate; 22. Annular gasket; 23. Protective tube; 24. Isolation plate; 25. Annular groove;

[0042] 300. Self-locking on / off connection mechanism; 301. Sealing head; 302. Conductive cylinder; 303. Plug; 304. Recess; 305. Sealing sleeve; 306. Ring shell; 307. Ring rib; 308. Air cushion; 309. Insert tube; 310. Ring plate; 311. Plug; 312. Expansion sleeve; 313. Inner groove; 314. Insertion hole; 315. Circulation groove; 316. Flow channel; 317. Socket; 318. Plug;

[0043] 30. Air chamber; 31. Sealing strip; 32. Groove; 33. Convex pad; 34. Air valve; 35. Safety valve. Detailed Implementation

[0044] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0045] Example: Figure 1-9 As shown, the present invention provides a technical solution, a medium-voltage cable that is easy to connect, including a cable body 1, a plurality of cable cores 11 are installed at equal angles along the circumferential direction inside the cable body 1, an insulating sleeve 12 is sleeved on the outer wall of the cable core 11, the insulating sleeve 12 is made of isocyanate and polyol to improve its elasticity and wear resistance, a shielding mesh 13 is embedded in the outer wall of the insulating sleeve 12, the shielding mesh 13 is made of aluminum foil, a shielding sleeve 14 is embedded in the inner wall of the cable body 1, the shielding sleeve 14 is woven from tin-plated copper wire to ensure the insulation performance and electromagnetic shielding effect of the cable, adapting to complex application scenarios, and a main protective mechanism 200 is installed on the inner side of the cable body 1;

[0046] The main protective structure 200 includes an inner sleeve 201;

[0047] An inner sleeve 201 is installed inside the cable body 1. An air bladder 202 is installed inside the inner sleeve 201. Several rings 203 are evenly installed on the outer wall of the inner sleeve 201 at equal intervals. Several branch rings 204 are evenly installed on both sides of the rings 203 at equal intervals. Several conduits 205 are evenly connected to the outer curved surface of the air bladder 202 at equal intervals. The branch rings 204 are in the shape of ring serrations. The branch rings 204, the cable body 1, the inner sleeve 201 and the rings 203 form several protective cavities 20 along the radial direction of the cable body 1. The air bladder 202 is connected to the protective cavity 20 through the conduits 205. The air bladder 202 and the protective cavity 20 are filled with sulfur hexafluoride to construct a pressure-resistant protection mechanism and improve the pressure resistance of the cable.

[0048] The inner sleeve 201 has a box 206 installed at one end. Several tie rods 208 are slidably installed at equal angles along the circumferential direction on the side end face of the box 206. An arc plate 207 is installed at one end of the tie rod 208. A partition plate 21 is installed inside the box 206 at both sides of the arc plate 207, and the arc plate 207 fits the partition plate 21. The length of the partition plate 21 is less than the length of the inner cavity of the box 206, and the sum of the length of the partition plate 21 and the thickness of the arc plate 207 is greater than the length of the inner cavity of the box 206. An annular pad 22 is installed at the other end of the tie rod 208. A protective tube 23 is sleeved on the outside of the tie rod 208. The outer diameter of the tie rod 208 is less than the inner diameter of the protective tube 23, and the protective tube 23 passes through the annular strip 203 to construct a dynamic tensile resistance mechanism and improve the tensile resistance of the cable. Several connecting pipes 209 are connected at equal angles along the circumferential direction on one side of the inner wall of the box 206.

[0049] An airbag 202 has a tube 210 installed inside it. Several round boxes 211 are evenly installed on the outer curved surface of the tube 210. A rotating head 212 is rotatably installed inside the round box 211. A rotating shaft 213 is installed at the end of the rotating head 212. A collar 214 is installed at the end of the rotating shaft 213. A core sleeve 215 is installed inside the collar 214. An insulating sleeve 12 is located inside the core sleeve 215 and fits into the core sleeve 215. A ring groove 25 is opened on the outer wall of the core sleeve 215 at the position corresponding to the collar 214, and the collar 214 fits into the ring groove 25. The gaps between the core sleeve 215, the tube 210 and the inner sleeve 201 are filled by the airbag 202. The cable core 11 is serrated along the radial direction of the cable body 1 in the initial state to give the cable ductility and improve the overall protection.

[0050] The bottom of the round box 211 is symmetrically provided with through holes 216, and an inner tube 217 is installed at the end of the through hole 216. An isolation plate 24 is provided on one side of the inner wall of the round box 211. The rotating head 212 and the isolation plate 24 divide the inner cavity of the round box 211 into two chambers. The through holes 216 on both sides of the rotating head 212 are respectively connected to the two chambers. The two ends of the inner tube 217 are respectively connected to the two through holes 216 located between two adjacent rotating heads 212. The inner cavity of the box body 206 is connected to the through hole 216 closest to the box body 206 through the connecting pipe 209. The box body 206 and the round box 211 are both filled with insulating oil to provide synchronous protection for the cable and improve the overall mechanical strength of the cable.

[0051] A self-locking on / off connection mechanism 300 is installed at one end of the cable body 1;

[0052] The self-locking on / off connection mechanism 300 includes a sealing head 301;

[0053] Both ends of the cable body 1 are equipped with sealing heads 301. An annular shell 306 is installed on one side of the inner curved surface of the sealing head 301. Annular ribs 307 are installed on both sides of the outer curved surface of the cable body 1 at the positions of the annular shell 306. An air cushion 308 is embedded in the inner curved surface of the annular shell 306. A protrusion 303 is installed at the end of one sealing head 301 and a recess 304 is installed at the end of the other sealing head 301. A sealing sleeve 305 is sleeved on the outside of the protrusion 303 and the recess 304.

[0054] A plurality of insert tubes 309 are slidably embedded in the end of the boss 303 at equal angles along the circumferential direction. One end of each insert tube 309 is fitted with a ring plate 310 located inside the boss 303, and the other end is fitted with a plug 311. An expansion sleeve 312 is embedded in the outer wall of the plug 311. An inner groove 313 is formed on one side of the inner wall of the boss 303. An insertion hole 314 is formed at the end of the recess 304 corresponding to the position of the plug 311. A plurality of sealing strips 31 are evenly and equidistantly installed on the outer wall of the boss 303, the outer wall of the recess 304, and the inner wall of the sealing sleeve 305. Both seat 303 and recessed seat 304 fit into sealing sleeve 305, and convex seat 303 and recessed seat 304 fit into each other. The outer curved surface of expansion sleeve 312 is provided with several grooves 32 at equal intervals. The inner wall of insertion hole 314 is provided with several convex pads 33 at equal intervals, and the convex pads 33 fit into the grooves 32. The plug 311 fits into insertion hole 314, and the inner cavity of plug 311 is connected to the inner cavity of expansion sleeve 312 to enhance the stability of cable connection and the sealing of joint. An acirculation groove 315 is provided inside recessed seat 304 at the end of insertion hole 314.

[0055] The sealing head 301 has flow channels 316 at the edges of the annular groove 315 and the boss 303. The inner wall of the sealing head 301 and the ring shell 306 form an air cavity 30. The inner cavity of the boss 303 and the annular groove 315 are connected to the air cavities 30 on the two sealing heads 301 through the two flow channels 316 respectively. The air cavity 30 is connected to the inner cavity of the air cushion 308. An air valve 34 is embedded and installed on the outer curved surface of the sealing head 301 at the position corresponding to the flow channel 316. A safety valve 35 is installed on one side of the end of the boss 303. The inner cavity of the boss 303 is connected to the inner space of the boss 303 through the inner groove 313. The inner groove 313 and the insertion tube 309 are located on both sides of the ring plate 310 to improve the connection stability and safety protection stability of the cable.

[0056] A sealing head 301 has several sockets 317 embedded at equal angles along the circumference at the end of the sealing head 301 located inside the protrusion 303. Another sealing head 301 has several plugs 318 embedded at equal angles along the circumference at the end of the sealing head 301 located inside the recess 304. The sockets 317 and plugs 318 fit together, and both sockets 317 and plugs 318 are connected to the cable core 11 through conductive cylinders 302. The conductive cylinders 302, sockets 317, and plugs 318 are all conductive structures to improve the convenience of cable connection and give the cable self-connection and protection capabilities. The ends of plugs 318 and sockets 317 are all equipped with conductive cylinders 302.

[0057] The working principle and usage process of this invention are as follows: First, the specifications and dimensions of the cable are selected and determined according to actual needs. Then, according to the total length of the cable required, the corresponding number of cables are selected. The cables are connected in sequence through the self-locking on / off connection mechanism 300. Finally, the cables are connected to the relevant devices according to actual application needs.

[0058] During the cable connection and installation process, firstly, using an external inflation device, sulfur hexafluoride gas is injected into the inside of the boss 303 through the safety valve 35, and the air pressure on the end face of the ring plate 310 is adjusted. This air pressure is the safe air pressure during cable use. By adjusting and limiting this air pressure, the self-protection sensitivity of the cable during use can be adjusted, and automatic protective switching at the joint can be achieved.

[0059] Next, one end of the sealing sleeve 305 is placed on the protrusion 303 of the first cable, and the plug 311 on it is aligned with the socket 314 on the second cable. The other end of the sealing sleeve 305 is placed on the recess 304 on the second cable, so that the corresponding plug 311 is inserted into the socket 314, and the protrusion 303 of the first cable abuts against the recess 304 on the second cable. Correspondingly, the plug 318 will also be inserted into the corresponding socket 317 to connect the cores 11 of the two cables.

[0060] Next, using an external inflation device, sulfur hexafluoride gas is injected into the gas valve 34. The sulfur hexafluoride gas passes through the gas valve 34 into the flow channel 316, and then enters the annular groove 315 through the flow channel 316. Subsequently, it passes through the plug 311 into the expansion sleeve 312, and passes through the insertion tube 309 into the space on the other side of the annular plate 310 inside the boss 303. Subsequently, it passes through the inner groove 313 into the space where the socket 317 and plug 318 are located inside the boss 303 and the concave seat 304. With the flow channel 316 connected, the sulfur hexafluoride gas also enters the gas chamber 30 simultaneously and fills the air cushion 308.

[0061] The aforementioned process can also be achieved by injecting sulfur hexafluoride gas through the gas valve 34 on the protrusion 303. Ultimately, the space filled by the sulfur hexafluoride gas will remain consistent, but the flow direction of the sulfur hexafluoride gas during the injection process will change accordingly. Finally, under the pressure of the sulfur hexafluoride gas, the expansion sleeve 312 will expand accordingly to press against the insertion hole 314, the protrusion pad 33 will be inserted into the groove 32 accordingly, and the air cushion 308 will also expand accordingly under the action of air pressure, squeezing the inner cable 1.

[0062] For ease of description, the sulfur hexafluoride gas pressure is used as the locking pressure. By adjusting and limiting the locking pressure, the pressure applied by the expansion sleeve 312 to the insertion hole 314 and the clamping force applied by the air cushion 308 to the cable body 1 can be adjusted, locking the protrusion 303, the recess 304, and the cable body 1, thus completing the connection between the two cables. It should be noted that while ensuring connection stability, the locking pressure should be less than the safety pressure. Repeat the above process to connect each cable in sequence. After connecting the cable to the corresponding device, it can be put into normal use.

[0063] During the use of the cable, the cable will heat up accordingly with the change of load. The heating phenomenon at the joint will be more obvious. The heat emitted will be absorbed by the sulfur hexafluoride gas in the space where the socket 317 and plug 318 are located inside the protrusion 303 and the concave seat 304, causing the gas pressure of the sulfur hexafluoride gas in this part to rise accordingly, that is, the locking gas pressure will rise accordingly.

[0064] During normal use of the cable, when the locking air pressure is less than the safe air pressure, the heat emitted by the cable can be used to increase the locking force between the boss 303 and the concave seat 304, as well as the locking force between the boss 303 and the concave seat 304 and the cable body 1. At the same time, sulfur hexafluoride gas can play a gaseous isolation role, improving the insulation and electromagnetic shielding effect at the joint.

[0065] When the cable is overloaded or short-circuited, the heat it emits increases, causing the locking air pressure to exceed the safety air pressure. At this time, under the pressure of the locking air pressure, the ring plate 310 will overcome the safety air pressure on the other side and push the insertion tube 309 to slide. At the same time, under the action of the locking air pressure, the expansion sleeve 312 will more stably squeeze the insertion hole 314, causing the insertion tube 309 to push the concave seat 304 through the plug 311, opening the gap between the concave seat 304 and the convex seat 303, disconnecting the connection between the socket 317 and the plug 318, and cutting off the connection between the two cables. By adjusting the locking air pressure and the safety air pressure in the aforementioned process, the process can be dynamically adjusted to achieve safe power transmission and prevent the spread of circuit faults in case of accidents.

[0066] Similarly, during the use of the cable, when the cable is subjected to an external impact, the cable body 1 will apply the impact force to the support ring 204. Under the impact of the external force, the support ring 204 will deform accordingly. Its serrated design can provide initial buffering of the external force. At the same time, its deformation will cause the protective cavity 20 to be compressed and squeezed. The sulfur hexafluoride gas inside the protective cavity 20 will enter the airbag 202 through the conduit 205, causing the air pressure inside the airbag 202 to rise, turning the external impact force into the internal pressure energy of the sulfur hexafluoride gas inside the airbag 202.

[0067] On the one hand, under the action of air pressure, the airbag 202 will provide more elastic support to the inner sleeve 201, preventing the cable body 1 from being further deformed by external impact force. That is, the external impact force is converted into a defensive force that inhibits the further deformation of the cable body 1, and the impact force is isolated from the cable core 11, so as to avoid the external impact force being directly applied to the cable core 11 and causing the cable core 11 to break. On the other hand, under the action of air pressure, with the flow of sulfur hexafluoride gas, the external impact force will be dispersed along the airbag 202, further buffering and diluting the external impact force, and avoiding the concentration of impact force.

[0068] When the cable is subjected to external force and bends under external bending stress, the pulling force will act more directly on the tie rod 208 under the action of the annular pad 22, causing the tie rod 208 to drag the arc plate 207. The corresponding arc plate 207 will squeeze the hydraulic fluid inside the box 206 under the action of the pulling force, forcing the hydraulic fluid to enter the round box 211 through the through hole 216 along the connecting pipe 209 under pressure.

[0069] Then, under the pressure of the hydraulic fluid, the rotating head 212 will deflect accordingly and squeeze the hydraulic fluid on the other side of the rotating head 212. The hydraulic fluid on the other side will enter the adjacent round box 211 through the through hole 216 and inner tube 217 on the other side of the rotating head 212, causing the adjacent rotating head 212 to deflect synchronously. The above process is repeated, causing each rotating head 212 to deflect synchronously. Then, under the drive of each rotating head 212, each rotating shaft 213 will drive each collar 214 to deflect synchronously, overcoming the pressure applied by the airbag 202 and adjusting the position of the core sleeve 215.

[0070] It is important to note that in the initial state, under the squeezing force of the airbag 202 and the limiting effect of the core sleeve 215, the cable core 11 is distributed in a sawtooth shape along the radial direction of the cable body 1. Under the action of external pulling force, as the collar 214 deflects, the core sleeve 215 will wrap around the cable core 11, causing the cable core 11 to gradually transform from a sawtooth shape to a straight shape, thus performing equivalent cable laying, increasing the length of the cable core 11 in the radial direction of the cable body 1, reducing the pulling force of external pulling on the cable core 11 and the pulling force on the cable core 11 during the bending of the cable body 1, and dispersing the pulling force and bending stress during the equivalent cable laying process of the collar 214 deflecting, thereby strengthening its tensile performance.

[0071] During the aforementioned process, the external impact force, external tensile force, and bending stress on the cable will eventually be applied to the airbag 202 simultaneously. While relieving the force and buffering, they will be converted into the internal pressure energy inside the airbag 202. After the external impact force, external tensile force, and bending stress on the cable are exhausted and disappear, the various structures of the cable will be reset accordingly under the action of the internal pressure energy inside the airbag 202.

[0072] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. Medium voltage cable with facilitated connection, comprising a cable body (1), characterized in that: The cable body (1) is internally installed with a plurality of cable cores (11) at equal angles in the circumferential direction, and the inner side of the cable body (1) is installed with a main body protection mechanism (200); The main body protection mechanism (200) comprises an inner sleeve (201); The inner sleeve (201) is internally installed with an air bag (202), and the outer wall of the inner sleeve (201) is uniformly installed with a plurality of ring strips (203) at equal intervals, the two sides of the ring strip (203) are uniformly installed with a plurality of branch rings (204) at equal intervals, the outer curved surface of the air bag (202) is uniformly connected with a plurality of catheters (205) at equal intervals, one end of the inner sleeve (201) is installed with a box body (206), the side end face of the box body (206) is slidingly installed with a plurality of reinforcing bars (208) at equal angles in the circumferential direction, one end of the reinforcing bar (208) is installed with an arc plate (207), and one side of the inner wall of the box body (206) is connected with a plurality of communication tubes (209) at equal angles in the circumferential direction; The inner side of the air bag (202) is installed with a pipe body (210), the outer curved surface of the pipe body (210) is uniformly installed with a plurality of circular boxes (211) at equal intervals, the inner side of the circular box (211) is rotatably installed with a rotating head (212), the end of the rotating head (212) is installed with a rotating shaft (213), the end of the rotating shaft (213) is installed with a sleeve ring (214), the inner side of the sleeve ring (214) is installed with a core sleeve (215), and the bottom end of the circular box (211) is symmetrically provided with a through hole (216), and the end of the through hole (216) is installed with an inner tube (217).

2. A medium voltage cable for facilitated connection according to claim 1, characterized in that The outer wall of the cable core (11) is sleeved with an insulating sleeve (12), the outer wall of the insulating sleeve (12) is embeddedly installed with a shielding net (13), and the inner wall of the cable body (1) is embeddedly installed with a shielding sleeve (14).

3. A medium voltage cable for facilitated connection according to claim 1, characterized in that The branch ring (204) is annular sawtooth-shaped, the branch ring (204), the cable body (1), the inner sleeve (201) and the ring strip (203) are enclosed to form a plurality of protection cavities (20) along the radial direction of the cable body (1), the air bag (202) is communicated with the protection cavity (20) through the catheter (205), and the air bag (202) and the protection cavity (20) are both filled with sulfur hexafluoride.

4. A medium voltage cable for facilitated connection according to claim 1, characterized in that The inner side of the box body (206) is installed with a partition plate (21) at both sides of the arc plate (207), the arc plate (207) is matched with the partition plate (21), the length of the partition plate (21) is less than the length of the inner cavity of the box body (206), the sum of the length of the partition plate (21) and the thickness of the arc plate (207) is greater than the length of the inner cavity of the box body (206), the other end of the reinforcing bar (208) is installed with an annular gasket (22), the outer side of the reinforcing bar (208) is sleeved with a protective tube (23), the outer diameter of the reinforcing bar (208) is less than the inner diameter of the protective tube (23), and the protective tube (23) penetrates the ring strip (203).

5. A medium voltage cable for facilitated connection according to claim 1, characterized in that, The inner wall of the round box (211) is provided with a partition plate (24), the rotating head (212) and the partition plate (24) divide the inner cavity of the round box (211) into two chambers, the through holes (216) on the two sides of the rotating head (212) are communicated with the two chambers respectively, the inner tube (217) is communicated with the two through holes (216) between the two adjacent rotating heads (212) respectively, and the inner cavity of the box body (206) is communicated with the closest through hole (216) of the box body (206) through the communication pipe (209). The box body (206) and the round box (211) are filled with insulating oil.

6. A medium voltage cable for facilitated connection according to claim 2, characterized in that The insulating sleeve (12) is located in the core sleeve (215), and the insulating sleeve (12) is matched with the core sleeve (215). The outer wall of the core sleeve (215) is provided with a ring groove (25) at the position corresponding to the sleeve ring (214), and the sleeve ring (214) is matched with the ring groove (25). The gaps between the core sleeve (215), the pipe body (210) and the built-in sleeve (201) are filled with the air bag (202). The cable core (11) is distributed in a zigzag shape along the radial direction of the cable body (1) in the initial state.

7. A medium voltage cable for facilitated connection according to claim 1, characterized in that The cable body (1) is provided with a self-locking on-off connection mechanism (300) at the end. The self-locking on-off connection mechanism (300) comprises a sealing head (301). The cable body (1) is provided with a sealing head (301) at both ends. The inner curved surface of the sealing head (301) is provided with a ring shell (306). The outer curved surface of the cable body (1) is provided with a ring rib (307) at the positions on both sides of the ring shell (306). The inner curved surface of the ring shell (306) is embeddedly provided with an air cushion (308). One end of the sealing head (301) is provided with a convex seat (303), and the other end of the sealing head (301) is provided with a concave seat (304). The outer side of the convex seat (303) and the concave seat (304) is sleeved with a sealing sleeve (305). A plurality of insertion tubes (309) are embeddedly and slidingly arranged at the end of the convex seat (303) at equal angles in the circumferential direction. The one end of the insertion tube (309) is provided with a ring plate (310) at the position in the inner part of the convex seat (303). The other end of the insertion tube (309) is provided with a plug cylinder (311). The outer wall of the plug cylinder (311) is embeddedly provided with an expansion sleeve (312). The inner wall of the convex seat (303) is provided with an inner groove (313) at one side. The end of the concave seat (304) is provided with an insertion hole (314) at the position corresponding to the plug cylinder (311). The inner part of the concave seat (304) is provided with a circulation groove (315) at the position of the end of the insertion hole (314). The inner part of the sealing head (301) is provided with a flow channel (316) at the positions corresponding to the edge of the circulation groove (315) and the edge of the convex seat (303). One end of the sealing head (301) is installed at an equal angle in the circumferential direction at the position inside the convex seat (303), and the other end of the sealing head (301) is installed at an equal angle in the circumferential direction at the position inside the concave seat (304), and the plug (318) and the socket (317) are installed at the end of the conductive cylinder (302).

8. A medium voltage cable for facilitated connection according to claim 7, characterized in that The inner wall of the sealing head (301) and the ring shell (306) form a gas cavity (30), the inner cavity of the convex seat (303) and the annular flow groove (315) are communicated with the gas cavity (30) on the two sealing heads (301) through two flow channels (316), and the gas cavity (30) is communicated with the inner cavity of the air cushion (308), the sealing head (301) is installed with an air valve (34) at the position corresponding to the flow channel (316), the safety valve (35) is installed on one side of the end of the convex seat (303), the inner cavity of the convex seat (303) is communicated with the space inside the convex seat (303) through the inner groove (313), and the inner groove (313) and the insertion tube (309) are located on both sides of the ring plate (310).

9. A medium voltage cable for facilitated connection according to claim 7, characterized in that The outer wall of the convex seat (303), the outer wall of the concave seat (304) and the inner wall of the sealing sleeve (305) are uniformly installed with a plurality of sealing strips (31) at equal intervals, the convex seat (303) and the concave seat (304) are matched with the sealing sleeve (305), and the convex seat (303) and the concave seat (304) are matched, the outer curved surface of the expansion sleeve (312) is provided with a plurality of grooves (32) at equal intervals, the inner wall of the insertion hole (314) is uniformly installed with a plurality of convex pads (33) at equal intervals, and the convex pad (33) is matched with the groove (32), the plug-in cylinder (311) is matched with the insertion hole (314), and the inner cavity of the plug-in cylinder (311) is communicated with the inner cavity of the expansion sleeve (312).

10. A medium voltage cable for facilitated connection according to claim 7, characterized in that The socket (317) is matched with the plug (318), and the socket (317) and the plug (318) are connected with the cable core (11) through the conductive cylinder (302), and the conductive cylinder (302), the socket (317) and the plug (318) are conductive structures.

Images