Medium-voltage cable convenient to connect

Abstract

The invention discloses a convenient-to-connect medium-voltage cable, and relates to the technical field of power cables, the convenient-to-connect medium-voltage cable comprises a cable body, a plurality of cable cores are installed in the cable body in the circumferential direction at equal angles, a built-in sleeve is installed on the inner side of the cable body, an air bag is installed in the built-in sleeve, and a plurality of ring strips are evenly installed on the outer wall of the built-in sleeve at equal intervals; according to the invention, double dispersion and buffering of external impact pressure can be realized, so that the cable can adapt to a more severe and complicated external environment, the external impact force can be converted into defense force for inhibiting further deformation of the cable body, and the cable can be prevented from being damaged. The external impact force is prevented from being directly applied to the cable core, the cable appearance is endowed with the automatic repairing capability, the cable body can be prevented from being directly and rigidly pulled, the external pulling force and the bending stress can be dispersed in the radial direction of the cable, and more comprehensive and reliable protection on the cable core is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, in particular to a medium-voltage cable that is easy to connect. Background Art

[0002] Medium-voltage cables are power cables with rated voltages between 1kV and 35kV. They are primarily used for transmitting and distributing electrical energy in power distribution systems. They typically consist of conductors, insulation layers, shielding layers, and outer sheaths. They must possess excellent 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 wrapped cable cores to enhance the mechanical properties of the cables. Due to the lack of targeted compression and tensile design, the improvement in the mechanical properties of the cables is limited, resulting in the cables being easily broken and damaged during use, affecting the insulation performance. The cable cores are also easily deformed, affecting the stability of power transmission and unable to adapt to complex external usage environments. Summary of the Invention

[0004] The present invention provides a medium-voltage cable that is easy to connect, which can effectively solve the problem raised in the above background technology that the 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, resulting in the cable being easily broken and damaged during use, affecting the insulation performance. The cable core is also easily deformed, affecting the stability of power transmission, and cannot adapt to complex external use environments.

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

[0006] The main body protection mechanism includes a built-in sleeve;

[0007] An internal sleeve is installed inside the cable body, an airbag is installed inside the internal sleeve, a number of ring strips are evenly installed on the outer wall of the internal sleeve, a number of support rings are evenly installed on both sides of the ring strips, a number of guide tubes are evenly connected to the outer curved surface of the airbag, a box body is installed on one end of the internal sleeve, a number of tie bars are installed on the side end surface of the box body for sliding at equal angles in the circumferential direction, an arc plate is installed on one end of the tie bar, and a number of connecting pipes are connected to one side of the inner wall of the box body at equal angles in the circumferential direction;

[0008] A tube body is installed on the inside of the airbag, and several round boxes are evenly and equidistantly installed on the outer curved surface of the tube. A rotating head is rotatably installed inside the round box, a rotating shaft is installed on the end of the rotating head, a support ring is installed on the end of the rotating shaft, a core sleeve is installed on the inside of the ring, and through holes are symmetrically opened at the bottom end of the round box, and an inner tube is installed on the end of the through hole.

[0009] Preferably, an insulating sleeve is sleeved on the outer wall of the cable core, a shielding net is embedded in the outer wall of the insulating sleeve, and a shielding sleeve is embedded in the inner wall of the cable body.

[0010] Preferably, the branch ring is annularly serrated, and the branch ring, cable body, built-in sleeve and ring strip form several protective cavities along the radial direction of the cable body. The airbag is connected to the protective cavity through a catheter, and the airbag and the protective cavity are both filled with sulfur hexafluoride.

[0011] Preferably, partition plates are installed inside the box body at both sides of the arc plate, and the arc plate fits with the partition plate. The length of the partition plate is less than the length of the inner cavity of the box body, 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 body. An annular pad is installed at the other end of the tie bar, and a protective tube is sleeved on the outside of the tie bar. The outer diameter of the tie bar is smaller than the inner diameter of the protective tube, and the protective tube passes through the ring bar.

[0012] Preferably, an isolation plate is provided on one side of the inner wall of the round box, and the rotor and the isolation plate divide the inner cavity of the round box into two chambers, and the through holes located on both sides of the rotor are respectively connected to the two chambers, and the two ends of the inner tube are respectively connected to the two through holes located between the two adjacent rotors, and the inner cavity of the box body is connected to the through hole closest to the box body through a connecting tube, and the box body and the inside of the round box are both filled with insulating oil.

[0013] Preferably, the insulating sleeve is located inside the core sleeve, and the insulating sleeve fits with the core sleeve. An annular groove is provided on the outer wall of the core sleeve corresponding to the position of the ring, and the ring fits with the annular groove. The gaps between the core sleeve and the tube body and the built-in sleeve are all filled with air bags. The cable core is distributed in a zigzag shape 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] Sealing heads are installed at both ends of the cable body, an annular shell is installed on one side of the inner curved surface of the sealing head, annular ribs are installed on both sides of the outer curved surface of the cable body, an air cushion is embedded in the inner curved surface of the annular shell, a convex seat is installed at one end of the sealing head, and a concave seat is installed at the other end of the sealing head, and sealing sleeves are sleeved on the outer sides of the convex seat and the concave seat;

[0017] A plurality of inserts are slidably mounted on the end of the convex seat at equal angles along the circumferential direction, a ring plate is mounted on one end of the insert, a plug is mounted on the other end of the insert, 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 convex seat, a plug hole is formed at the end of the concave seat corresponding to the position of the plug, a circulation groove is formed inside the concave seat at the end of the plug hole, and flow channels are formed inside the sealing head at the edges of the circulation groove and the edges of the convex seat;

[0018] One end of the sealing head is located inside the convex seat and is embedded with several sockets at equal angles along the circumferential direction. The other end of the sealing head is located inside the concave seat and is embedded with several plugs at equal angles along the circumferential direction. Both the plug and socket ends are installed with conductive tubes.

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

[0020] Preferably, a number 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 are both matched with the sealing sleeve, and the convex seat and the concave seat are matched with each other, the outer curved surface of the expansion sleeve is evenly and equidistantly provided with a number of grooves, the inner wall of the socket is evenly and equidistantly installed with a number of convex pads, and the convex pads are matched with the grooves, the plug tube is matched with the socket, and the inner cavity of the plug tube is connected with the inner cavity of the expansion sleeve.

[0021] Preferably, the socket and the plug are matched, and both the socket and the plug are connected to the cable core through a conductive tube, and the conductive tube, the socket and the plug are all conductive structures.

[0022] Compared with the prior art, the present invention has the following beneficial effects: the structure of the present invention is scientific and reasonable, and the use is safe and convenient;

[0023] 1. It is equipped with a main body protection mechanism, which can form a pressure-resistant isolation structure through the cooperation of built-in sleeves, air bags, rings, support rings and conduits, effectively improving the adaptability of the cable to complex external use environments. On the one hand, it can achieve dual dispersion and elimination of external impact pressure. While improving the compressive properties of the cable, it can effectively solve the pain point of stress concentration when the cable is impacted by external forces, effectively reducing the probability of cable damage under external force impact, so that the cable can adapt to more severe and complex external environments. On the other hand, it can transform external impact stress into internal supporting force of the cable body, and transform external impact force into defensive force to inhibit further deformation of the cable body. It can not only isolate the impact force from the cable core, avoid external impact force directly applied to the cable core, greatly improve the protection effect of the cable core, and reduce the probability of cable core deformation, but also transform external impact force into internal air pressure energy of the cable, giving the cable shape automatic repair ability;

[0024] By cooperating with the box body, arc plate, tensioning rod, connecting tube, tube body, round box, rotating head, rotating shaft, ring, through hole and inner tube, a tensile-resistant pay-out structure can be formed. Combined with the limiting constraint of the core sleeve, the external pulling force and bending stress can be used as the driving force to actively and equivalently pay out the cable core. This not only makes the cable core more adaptable to the deformation and expansion process of the cable body under the action of external pulling force and bending stress, and avoids the cable body from being subjected to direct hard pulling, but also disperses the external pulling force and bending stress along the radial direction of the cable, and further converts them into the internal air pressure energy of the air cushion, thereby greatly improving the stability of the internal structure of the cable. Combined with the pressure-resistant isolation structure, it can achieve more comprehensive and reliable protection of the cable core, and greatly improve the comprehensive mechanical properties of the cable.

[0025] 2. A self-locking on-off connection mechanism is provided. Through the cooperation of the sealing head, convex seat, concave seat, sealing sleeve, ring shell, ring rib and air cushion, a sealed connection structure can be formed, which can effectively improve the sealing performance of the cable joint. In addition, the flow limiting and guiding function of the insert tube, ring plate, plug tube, expansion sleeve, inner groove, jack, annular groove and flow channel can constitute a self-locking protection mechanism to recycle and convert the heat emitted during the use of the cable. On the one hand, the heat emitted during the use of the cable can be converted into the connection stress of the cable connection, and the sealing performance and connection stability of the joint during the use of the cable can be simultaneously improved. The connection stress of the cable connection can be adjusted, and the rigid connection can be converted into an elastic self-locking connection, which solves the problem that the cable joint is easy to loosen and fall off under external force disturbance, enhances the working stability and use safety of the cable, and can cooperate with the main body protection mechanism to further enhance the overall mechanical strength of the cable during use.

[0026] On the other hand, it can be used in conjunction with the conductive tube socket and plug to convert the heat emitted during the use of the cable into a self-protection driving force. It can actively cut off the connection between cables when the cable is overloaded or short-circuited, forming a real-time protection on-off mechanism, which can isolate the faulty cable more efficiently and stably. It can not only effectively enhance the timeliness and effectiveness of the self-protection work at the joints during the use of the cable, but also effectively prevent the propagation of cable faults during use, effectively reduce cable fault losses, and reduce the subsequent maintenance costs of the cable. At the same time, automatically cutting off the connection of the faulty cable can more quickly determine the fault point, greatly reduce the difficulty of maintenance, and make the subsequent use of the cable more stable and reliable. On the other hand, it can realize gaseous protection at the joints, improve the insulation and electromagnetic shielding effect of the joints, and reduce arc damage.

[0027] In summary, this cable has targeted pressure protection mechanisms and anti-pulling and anti-bending protection mechanisms, which can achieve more comprehensive elastic protection for the cable core, greatly enhance the cable's pressure and tensile properties, and simultaneously reduce the probability of cable breakage and conductor deformation, thereby improving the cable's power transmission stability and significantly improving the stability and reliability of the cable connection. It also has a self-switching protection mechanism that can effectively isolate faulty cables in a timely manner to prevent the spread of cable faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0029] In the attached figure:

[0030] Figure 1 It is a structural schematic diagram of the present invention;

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

[0032] Figure 3 It is a schematic structural diagram of the main body protection mechanism of the present invention;

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

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

[0035] Figure 6 This is a schematic diagram of the rotor installation structure of the present invention;

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

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

[0038] Figure 9 It is a schematic diagram of the recess installation structure of the present invention;

[0039] Reference numerals in the figure: 1, cable body; 11, cable core; 12, insulation sleeve; 13, shielding mesh; 14, shielding sleeve;

[0040] 200, main body protection mechanism; 201, built-in sleeve; 202, airbag; 203, ring strip; 204, support ring; 205, catheter; 206, box body; 207, arc plate; 208, tie rod; 209, connecting pipe; 210, tube 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. Separator plate; 22. Ring gasket; 23. Protective tube; 24. Isolation plate; 25. Ring groove;

[0042] 300, self-locking on / off connection mechanism; 301, sealing head; 302, conductive cylinder; 303, protruding seat; 304, recessed seat; 305, sealing sleeve; 306, ring shell; 307, ring rib; 308, air cushion; 309, cannula; 310, ring plate; 311, plug cylinder; 312, expansion sleeve; 313, inner groove; 314, jack; 315, circulation groove; 316, flow channel; 317, socket; 318, plug;

[0043] 30. Air cavity; 31. Sealing strip; 32. Groove; 33. Pad; 34. Air valve; 35. Safety valve. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used 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, and the insulating sleeve 12 is made of isocyanate and polyol to improve its elasticity and wear resistance. A shielding net 13 is embedded and installed on the outer wall of the insulating sleeve 12, and the shielding net 13 is made of aluminum foil. A shielding sleeve 14 is embedded and installed on the inner wall of the cable body 1, and the shielding sleeve 14 is woven from tinned copper wire to ensure the insulation performance and electromagnetic shielding effect of the cable, and adapt to complex application scenarios. A main body protection mechanism 200 is installed on the inner side of the cable body 1;

[0046] The main body protection mechanism 200 includes a built-in sleeve 201;

[0047] An internal sleeve 201 is installed on the inside of the cable body 1, and an airbag 202 is installed inside the internal sleeve 201. Several ring strips 203 are evenly installed on the outer wall of the internal sleeve 201, and several branch rings 204 are evenly installed on both sides of the ring strips 203. Several conduits 205 are evenly connected to the outer curved surface of the airbag 202. The branch rings 204 are annular and serrated. The branch rings 204, the cable body 1, the internal sleeve 201 and the ring strips 203 are combined to form several protective cavities 20 along the radial direction of the cable body 1. The airbag 202 is connected to the protective cavity 20 through the conduit 205, and the airbag 202 and the protective cavity 20 are filled with sulfur hexafluoride to construct a pressure protection mechanism to improve the pressure resistance of the cable.

[0048] A box body 206 is installed at one end of the built-in sleeve 201, and a plurality of tie bars 208 are installed on the side surface of the box body 206 at equal angles for sliding along the circumferential direction. An arc plate 207 is installed at one end of the tie bar 208. A partition plate 21 is installed on both sides of the arc plate 207 inside the box body 206, and the arc plate 207 fits 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, 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 body 206. An annular pad 22 is installed at the other end of the tie bar 208. A protective tube 23 is sleeved on the outside of the tie bar 208. The outer diameter of the tie bar 208 is less than the inner diameter of the protective tube 23, and the protective tube 23 passes through the ring bar 203 to construct a dynamic tensile mechanism to improve the tensile performance of the cable. A plurality of connecting tubes 209 are connected to one side of the inner wall of the box body 206 at equal angles along the circumferential direction.

[0049] A tube body 210 is installed on the inside of the airbag 202, and a number of round boxes 211 are evenly and equidistantly installed on the outer curved surface of the tube body 210. A rotary head 212 is rotatably installed inside the round box 211, and a rotating shaft 213 is installed at the end of the rotating head 212. A support ring 204 is installed at the end of the rotating shaft 213. A core sleeve 215 is installed on the inside of the ring 214. The insulating sleeve 12 is located inside the core sleeve 215, and the insulating sleeve 12 fits with the core sleeve 215. An annular groove 25 is provided on the outer wall of the core sleeve 215 at the position corresponding to the ring 214, and the ring 214 fits with the annular groove 25. The gaps between the core sleeve 215, the tube body 210 and the built-in sleeve 201 are all filled with the airbag 202. In the initial state, the cable core 11 is distributed in a zigzag shape along the radial direction of the cable body 1 to give the cable ductility and improve the comprehensiveness of protection.

[0050] A through hole 216 is symmetrically provided at the bottom end of the round box 211, 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, and the through holes 216 located on both sides of the rotating head 212 are respectively connected to the two chambers, and the two ends of the inner tube 217 are respectively connected to the two through holes 216 located between the two adjacent rotating heads 212, and the inner cavity of the box body 206 is connected to the through hole 216 closest to the box body 206 through the connecting tube 209. The box body 206 and the round box 211 are both filled with insulating oil to synchronously protect the cable and improve the comprehensive mechanical strength of the cable.

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

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

[0053] Sealing heads 301 are installed at both ends of the cable body 1. 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 located on the annular shell 306. An air cushion 308 is embedded in the inner curved surface of the annular shell 306. A convex seat 303 is installed at the end of one sealing head 301, and a concave seat 304 is installed at the end of the other sealing head 301. Sealing sleeves 305 are sleeved on the outer sides of the convex seat 303 and the concave seat 304.

[0054] The end of the convex seat 303 is embedded with a number of inserts 309 slidably installed at equal angles along the circumferential direction. One end of the insert 309 is located at the inner position of the convex seat 303 and a ring plate 310 is installed. The other end of the insert 309 is installed with a plug tube 311. The outer wall of the plug tube 311 is embedded with an expansion sleeve 312. An inner groove 313 is provided on one side of the inner wall of the convex seat 303, and a socket 314 is provided at the end of the concave seat 304 corresponding to the position of the plug tube 311. Several sealing strips 31 are evenly installed on 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. The seat 303 and the recess 304 both fit together with the sealing sleeve 305, and the protruding seat 303 fits together with the recess 304. The outer curved surface of the expansion sleeve 312 is evenly and evenly provided with a number of grooves 32. The inner wall of the insertion hole 314 is evenly and evenly provided with a number of convex pads 33, which fit together with the grooves 32. The plug tube 311 fits together with the insertion hole 314, and the inner cavity of the plug tube 311 is connected to the inner cavity of the expansion sleeve 312 to enhance the stability of the cable connection and the sealing of the joint. A circulation groove 315 is provided inside the recess 304 at the end of the insertion hole 314.

[0055] Flow channels 316 are provided inside the sealing head 301 at the edges of the corresponding annular groove 315 and the edges of the convex seat 303. The inner wall of the sealing head 301 and the ring shell 306 enclose an air cavity 30. The inner cavity of the convex seat 303 and the annular groove 315 are respectively connected to the air cavities 30 on the two sealing heads 301 through two flow channels 316, and the air cavity 30 is connected to the inner cavity of the air cushion 308. An air valve 34 is embedded and installed at the position of the flow channel 316 on the outer curved surface of the sealing head 301. A 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 connected to the inner space of the convex seat 303 through the inner groove 313. The inner groove 313 and the cannula 309 are respectively located on both sides of the ring plate 310 to improve the connection stability and safety protection stability of the cable.

[0056] The end of one sealing head 301 is located at the inner side of the convex seat 303 and is embedded with several sockets 317 at equal angles along the circumferential direction. The end of the other sealing head 301 is located at the inner side of the concave seat 304 and is embedded with several plugs 318 at equal angles along the circumferential direction. The sockets 317 and the plugs 318 fit together, and both the sockets 317 and the plugs 318 are connected to the cable core 11 through the conductive tube 302. The conductive tube 302, the socket 317 and the plug 318 are all conductive structures to improve the convenience of cable connection and give the cable self-switching protection capability. The ends of the plug 318 and the socket 317 are both installed with a conductive tube 302.

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

[0058] During the cable connection and installation process, first, external inflating equipment is used to inject sulfur hexafluoride gas into the protrusion 303 through the safety valve 35 to adjust the air pressure on the side end surface of the ring plate 310. This air pressure is the safety air pressure during cable use. By adjusting and limiting this air pressure, the self-protection sensitivity of the cable during use can be adjusted to achieve automatic protective on / off at the joint;

[0059] Next, one end of the sealing sleeve 305 is placed over the convex seat 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 over the concave seat 304 on the second cable, and the corresponding plug 311 is inserted into the socket 314, so that the convex seat 303 of the first cable abuts the concave seat 304 on the second cable. Correspondingly, the plug 318 is also inserted into the corresponding socket 317, connecting the cable cores 11 of the two cables.

[0060] Then, using an external inflation device, sulfur hexafluoride gas is injected into the air valve 34. The sulfur hexafluoride gas passes through the air valve 34 and enters the flow channel 316. Then, it enters the annular groove 315 through the flow channel 316. Then, it enters the expansion sleeve 312 through the plug tube 311 and passes through the insert 309 to enter the space on the other side of the ring plate 310 inside the protrusion 303. Then, it passes through the inner groove 313 and enters the space where the socket 317 and plug 318 are located inside the protrusion 303 and the recess 304. With the flow channel 316 connected, the sulfur hexafluoride gas also enters the air cavity 30 at the same time and fills the air cushion 308.

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

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

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

[0064] During normal use of the cable, that is, when the locking pressure is lower than the safety pressure, the heat emitted by the cable can be used to increase the locking force between the protrusion 303 and the recess 304, as well as the locking force between the protrusion 303, the recess 304 and the cable body 1. At the same time, sulfur hexafluoride gas can play a gaseous insulating role, improving the insulation and electromagnetic shielding effect of the joint.

[0065] When the cable is overloaded or a short circuit occurs, the heat it emits increases, causing the locking air pressure to be greater than the safety air pressure. At this time, under the push of the locking air pressure, the ring plate 310 will overcome the safety air pressure on the other side and push the insert 309 to slide. At the same time, under the action of the locking air pressure, the expansion sleeve 312 will more stably squeeze the plug hole 314, causing the insert 309 to push the recess 304 through the plug tube 311, widening the distance between the recess 304 and the protrusion 303, disconnecting the socket 317 and the plug 318, and severing the connection between the two cables. By adjusting the locking air pressure and the safety air pressure in the above process, the process can be dynamically adjusted to achieve safe transmission of electrical energy and prevent the spread of circuit faults in the event of an accident.

[0066] Similarly, during the use of the cable, when the cable is subjected to external force, the cable body 1 will apply the impact force to the support ring 204. Under the external force, the support ring 204 will deform accordingly. Its serrated design can initially buffer 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 internal pressure of the airbag 202 to rise, converting the external impact force into the internal energy of the sulfur hexafluoride gas pressure inside the airbag 202.

[0067] On the one hand, under the action of the internal energy of the air pressure, the airbag 202 will provide the internal sleeve 201 with more sufficient elastic support, preventing the external impact force from causing further deformation of the cable body 1, that is, converting the external impact force into a defensive force that inhibits further deformation of the cable body 1, isolating the impact force from the cable core 11, and preventing the external impact force from being directly applied to the cable core 11, causing damage to the cable core 11. On the other hand, under the action of air pressure, as the sulfur hexafluoride gas flows, the external impact force will be dispersed along the airbag 202, further buffering and diluting the external impact force, and avoiding the concentration of the impact force.

[0068] When the cable is pulled by an external force and bends under the action of 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 body 206 under the action of the pulling force, forcing the hydraulic fluid to flow through the through hole 216 along the connecting pipe 209 and into the round box 211 under the action of pressure.

[0069] Then, under the pressure of the hydraulic fluid, the turret 212 deflects accordingly, squeezing the hydraulic fluid on the other side of the turret 212, and the hydraulic fluid on the other side enters the adjacent round box 211 through the through hole 216 and the inner tube 217 on the other side of the turret 212, causing the adjacent turret 212 to deflect synchronously. The aforementioned process is repeated, causing each turret 212 to deflect synchronously. Then, driven by each turret 212, each rotating shaft 213 drives each collar 214 to deflect synchronously, overcoming the pressure applied by the airbag 202 and adjusting the orientation of the core sleeve 215.

[0070] It should be noted here 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 zigzag shape along the radial direction of the cable body 1. Under the pulling effect of the external force, as the ring 214 deflects, the core sleeve 215 will wrap the cable core 11, so that the cable core 11 is gradually transformed from a zigzag shape to a straight shape, and equivalent pay-off is performed, thereby lengthening the length of the cable core 11 in the radial direction of the cable body 1, reducing the pulling force on the cable core 11 caused by external pulling and the pulling force on the cable core 11 during the bending process of the cable body 1, and dispersing the pulling force and bending stress during the equivalent pay-off process of the ring 214 deflecting the cable core 11, thereby enhancing its tensile performance.

[0071] In the above process, the external impact force, external pulling force and bending stress applied to the cable will eventually be applied to the airbag 202 simultaneously, and while performing force unloading and buffering, it will be converted into the internal energy of the air pressure inside the airbag 202. After the external impact force, external pulling force and bending stress applied to the cable are exhausted and disappear, under the action of the internal energy of the air pressure inside the airbag 202, the various structures of the cable will be reset accordingly.

[0072] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A medium voltage cable that is easy to connect, comprising a cable body (1), characterized in that: A plurality of cable cores (11) are installed at equal angles along the circumferential direction inside the cable body (1), and a main body protection mechanism (200) is installed inside the cable body (1); The main body protection mechanism (200) comprises a built-in sleeve (201); The cable body (1) is provided with an internal sleeve (201), an air bag (202) is provided inside the internal sleeve (201), a plurality of ring strips (203) are provided on the outer wall of the internal sleeve (201) at equal intervals, a plurality of support rings (204) are provided on both sides of the ring strips (203) at equal intervals, a plurality of guide tubes (205) are provided on the outer curved surface of the air bag (202) at equal intervals, a box body (206) is provided on one end of the internal sleeve (201), a plurality of tie rods (208) are provided on the side end surface of the box body (206) so as to be slidable at equal angles along the circumferential direction, an arc plate (207) is provided on one end of the tie rod (208), and a plurality of connecting pipes (209) are provided on one side of the inner wall of the box body (206) at equal angles along the circumferential direction; A tube body (210) is installed inside the airbag (202), and a plurality of round boxes (211) are evenly and equidistantly installed on the outer curved surface of the tube body (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 support ring (204) is installed at the end of the rotating shaft (213), a core sleeve (215) is installed inside the sleeve ring (214), and a through hole (216) is symmetrically opened at the bottom end of the round box (211), and an inner tube (217) is installed at the end of the through hole (216).

2. A medium voltage cable that is easy to connect according to claim 1, characterized in that: An insulating sleeve (12) is sleeved on the outer wall of the cable core (11), a shielding net (13) is embedded and installed on the outer wall of the insulating sleeve (12), and a shielding sleeve (14) is embedded and installed on the inner wall of the cable body (1).

3. The medium voltage cable that is easy to connect according to claim 1, characterized in that: The support ring (204) is annular and sawtooth-shaped, and the support ring (204), the cable body (1), the built-in sleeve (201) and the ring strip (203) enclose a plurality of protective cavities (20) along the radial direction of the cable body (1). The airbag (202) is connected to the protective cavity (20) through a conduit (205), and the interior of the airbag (202) and the protective cavity (20) are both filled with sulfur hexafluoride.

4. The medium voltage cable that is easy to connect according to claim 1, characterized in that: A partition plate (21) is installed inside the box body (206) at positions on both sides of the arc plate (207), and the arc plate (207) fits in 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), 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 body (206). An annular pad (22) is installed at the other end of the tie bar (208). A protective tube (23) is sleeved on the outside of the tie bar (208). The outer diameter of the tie bar (208) is less than the inner diameter of the protective tube (23), and the protective tube (23) passes through the ring bar (203).

5. The medium voltage cable that is easy to connect according to claim 1, characterized in that: 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) separate the inner cavity of the round box (211) into two chambers, and the through holes (216) located 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 the two adjacent rotating heads (212), and the inner cavity of the box body (206) is connected to the through hole (216) closest to the box body (206) through the connecting tube (209). The interior of the box body (206) and the round box (211) are both filled with insulating oil.

6. The medium voltage cable that is easy to connect according to claim 2, characterized in that: The insulating sleeve (12) is located inside the core sleeve (215), and the insulating sleeve (12) and the core sleeve (215) are matched. An annular groove (25) is provided on the outer wall of the core sleeve (215) at a position corresponding to the collar (214), and the collar (214) and the annular groove (25) are matched. The gaps between the core sleeve (215), the tube body (210) and the built-in sleeve (201) are all filled with airbags (202). In the initial state, the cable core (11) is distributed in a zigzag shape along the radial direction of the cable body (1).

7. The medium voltage cable that is easy to connect according to claim 1, characterized in that: A self-locking on-off connection mechanism (300) is installed at the end of the cable body (1); The self-locking on-off connection mechanism (300) comprises a sealing head (301); Both ends of the cable body (1) are equipped with sealing heads (301), one side of the inner curved surface of the sealing head (301) is equipped with an annular shell (306), the outer curved surface of the cable body (1) is equipped with annular ribs (307) at positions on both sides of the annular shell (306), the inner curved surface of the annular shell (306) is embedded with an air cushion (308), one end of the sealing head (301) is equipped with a convex seat (303), and the other end of the sealing head (301) is equipped with a concave seat (304), and the outer sides of the convex seat (303) and the concave seat (304) are sleeved with sealing sleeves (305); The end of the convex seat (303) is embedded with a plurality of inserts (309) slidably installed at equal angles along the circumferential direction, one end of the inserts (309) is installed with a ring plate (310) at an internal position of the convex seat (303), the other end of the inserts (309) is installed with a plug tube (311), the outer wall of the plug tube (311) is embedded with an expansion sleeve (312), an inner groove (313) is provided on one side of the inner wall of the convex seat (303), an insert hole (314) is provided at the end of the concave seat (304) corresponding to the position of the plug tube (311), a circulation groove (315) is provided inside the concave seat (304) at the end position of the insert hole (314), and a flow channel (316) is provided at the edge of the sealing head (301) corresponding to the circulation groove (315) and the edge of the convex seat (303); One end of the sealing head (301) is located inside the convex seat (303) and is embedded with a plurality of sockets (317) at equal angles along the circumferential direction. Another end of the sealing head (301) is located inside the concave seat (304) and is embedded with a plurality of plugs (318) at equal angles along the circumferential direction. The ends of the plugs (318) and the sockets (317) are both installed with conductive tubes (302).

8. The medium voltage cable easy to connect according to claim 7, characterized in that: The inner wall of the sealing head (301) and the annular shell (306) are combined to form an air cavity (30); the inner cavity of the convex seat (303) and the annular flow groove (315) are respectively communicated with the air cavities (30) on the two sealing heads (301) through two flow channels (316), and the air cavity (30) is connected to the inner cavity of the air cushion (308); an air valve (34) is embedded and installed at a position corresponding to the flow channel (316) on the outer curved surface of the sealing head (301); a 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 inner space of the convex seat (303) through the inner groove (313), and the inner groove (313) and the insert (309) are respectively located on both sides of the ring plate (310).

9. The medium voltage cable that is easy to connect 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 evenly and evenly installed with a plurality of sealing strips (31); the convex seat (303) and the concave seat (304) are both matched with the sealing sleeve (305), and the convex seat (303) and the concave seat (304) are matched with each other; the outer curved surface of the expansion sleeve (312) is evenly and evenly provided with a plurality of grooves (32); the inner wall of the insertion hole (314) is evenly and evenly installed with a plurality of convex pads (33), and the convex pads (33) are matched with the grooves (32); the plug tube (311) is matched with the insertion hole (314), and the inner cavity of the plug tube (311) is connected with the inner cavity of the expansion sleeve (312).

10. The medium voltage cable that is easy to connect according to claim 7, characterized in that: The socket (317) and the plug (318) are matched, and both the socket (317) and the plug (318) are connected to the cable core (11) via the conductive tube (302). The conductive tube (302), the socket (317) and the plug (318) are all conductive structures.

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