High-voltage cable joint fireproof sleeve with rapid reburning inhibition function

Abstract

The invention belongs to the technical field of cable joint external protection components, and particularly relates to a high-voltage cable joint fireproof sleeve with a rapid reburning inhibition function, which comprises a protection component, a cooling component, a plugging component and a fastening component. When the temperature of the cable connector is abnormally increased, the material storage film ring bag tightly attached to the connector can automatically age, shrink and crack along with the temperature rise, and the perfluorohexanone fire extinguishing agent filler can be quickly released without manual intervention. After perfluorohexanone is heated and vaporized, on one hand, a large amount of heat at the joint can be quickly absorbed, the temperature of the joint is reduced to a safety threshold within a short time, and fire spreading is restrained from the source; and on the other hand, steam generated by vaporization can rapidly dilute oxygen concentration between the connector and the high-temperature-resistant rubber inner cylinder, so that the oxygen content is reduced to be below a combustion-supporting critical value, suffocation extinguishment is achieved, the extinguishment success rate is increased, and the problem that fire spreads after an existing protective sleeve is damaged at high temperature is solved.

Description

Technical Field

[0001] This invention belongs to the technical field of external protective components for cable joints, specifically relating to a fireproof sleeve for high-voltage cable joints with a function of quickly suppressing reignition. Background Technology

[0002] In power transmission and transformation cable line systems, cable terminations and intermediate joints are core components ensuring the safe and stable operation of the lines. Their core function is to disperse the electric field intensity at the cut point of the cable termination's outer shield, preventing the cable from being broken down due to electric field concentration, while simultaneously achieving effective connection and extension of the cable line. To further ensure the operational reliability of cable joints, the industry commonly uses protective films or insulating sleeves to cover the outside of cable terminations and intermediate joints. This protective structure, in addition to assisting in enhancing the electric field dispersion effect, also plays a crucial role in internal and external insulation isolation and waterproof sealing. It effectively prevents external moisture and impurities from intruding into the joint, avoiding a decline in the joint's insulation performance and ensuring the continuous and stable power transmission of the power transmission and transformation lines.

[0003] However, during actual power transmission in cable lines, abnormal temperature rises are very likely to occur at cable joints, becoming a major hidden danger restricting the safe operation of the line. On the one hand, cable lines themselves have inherent current impedance, and during power transmission, some electrical energy will be converted into heat energy due to impedance loss, resulting in a certain amount of heat generated in the cable as a whole. On the other hand, as a weak link in the line connection, the operating state of cable joints is affected by a variety of factors. If the insulation strength of the joint is insufficient, the installation tightness is improper, or the conductor contact is not tight, the current impedance at the joint position will increase significantly, far exceeding the impedance of the cable body. The increased impedance will cause a large amount of heat to accumulate at the joint, thus leading to abnormal temperature rise.

[0004] Regarding the aforementioned technologies, the inventors have discovered that existing protective insulating sleeves for cable joints generally suffer from core technical defects. They lack fire-resistant properties and are ill-suited for the harsh operating conditions of abnormally high joint temperatures. When the joint temperature rises abnormally, the existing protective insulating sleeves are insufficient in high-temperature resistance, easily softening, deforming, or even melting and breaking. After the insulating sleeve breaks, its original insulation and waterproofing functions completely fail, allowing external moisture and impurities to directly penetrate the joint, causing a sharp decrease in the joint's insulation strength and leading to faults such as short circuits and leakage. More seriously, the damaged insulating sleeve cannot prevent the high temperature from affecting the surrounding cables and environment. If the joint temperature continues to rise and causes a local fire, the fire-resistant insulating sleeve will burn rapidly, accelerating the spread of the fire and potentially triggering large-scale cable line faults, or even causing a fire accident, resulting in significant economic losses and safety risks. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide a fireproof sleeve for a high-voltage cable connector with a function of quickly suppressing reignition.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fireproof sleeve for a high-voltage cable joint with a rapid reignition suppression function, comprising a protective component, a cooling component, a sealing component, and a fastening component;

[0007] The protective components include a protective outer cylinder, which is used to protect the high-voltage cable joint. Both the upper and lower sides of the protective outer cylinder are connected and assembled with venting components, which are used to guide and discharge high-pressure gas. The protective outer cylinder is equipped with a cooling component inside, and both ends of the protective outer cylinder are fixedly assembled with fastening components, which are used to fix to the joint cable. The fastening components are equipped with a sealing component inside, which is used to seal the gap between the joint cable and the protective outer cylinder.

[0008] The cooling component includes a high-temperature resistant rubber inner cylinder, which is horizontally fixed inside the protective outer cylinder. An installation groove is provided on the inner circumference of the high-temperature resistant rubber inner cylinder. An airbag ring is horizontally fixed in the installation groove of the high-temperature resistant rubber inner cylinder. Multiple material storage film ring bags are arranged sequentially and spaced along the axial direction of the cable on the inner wall of the airbag ring. The internal cavities of the multiple material storage film ring bags are all sealed and filled with fire extinguishing agent filler.

[0009] Furthermore, a pressure relief channel is provided on the inner circumference of the protective outer cylinder, and multiple reinforcing support rings are embedded and fixed inside the protective outer cylinder along the axial direction;

[0010] The protective outer sleeve is preferably made of neoprene rubber.

[0011] Furthermore, multiple vent holes are provided through both sides of the high-temperature resistant rubber inner cylinder, and the multiple vent holes of the high-temperature resistant rubber inner cylinder are connected to the pressure relief channel in the protective outer cylinder. A sealing diaphragm is fixed in each of the multiple vent holes of the high-temperature resistant rubber inner cylinder, and a weak line is engraved in the middle of the sealing diaphragm.

[0012] The high-temperature resistant rubber inner cylinder is preferably made of silicone rubber.

[0013] Furthermore, the venting component includes a pressure relief tube and a cap. The bottom end of the pressure relief tube is vertically connected and fixed to the outer protective cylinder, and the bottom of the inner wall of the pressure relief tube is horizontally fixed with a perforated frame. The cap is vertically movable and inserted into the outside of the pressure relief tube.

[0014] Furthermore, a guide rod is vertically fixed on the inner bottom surface of the cap, and the guide rod on the cap is vertically slidably inserted into the hole frame. Multiple vent holes are evenly opened through the bottom of the outer circumference of the cap. A compression spring is vertically sleeved on the outside of the guide rod, and the two ends of the compression spring are respectively fixed to the bottom surface of the hole frame and the bottom end surface of the guide rod.

[0015] Furthermore, the airbag ring is filled with nitrogen gas, and the airbag ring is preferably made of fluororubber.

[0016] The storage film ring bag is preferably made of polypropylene.

[0017] The preferred material for the extinguishing agent filler is perfluorohexanone.

[0018] Furthermore, the sealing component includes a support cylinder, one end of which is fixed to one end face of the protective outer cylinder, and a support rod ring is fixed inside the support cylinder on the side away from the protective outer cylinder. A support column is uniformly and horizontally fixed on the end face of the support rod ring near the protective outer cylinder, and a storage sealing ring is inserted into the support column of the support rod ring. The storage sealing ring is filled with paraffin-based phase change filler.

[0019] Furthermore, a memory metal ring is fixed to the side of the internal storage sealing ring of the support cylinder near the protective outer cylinder, and multiple cutting blades are evenly and horizontally fixed to the side of the memory metal ring near the storage sealing ring.

[0020] The storage sealing ring is made of polystyrene film;

[0021] Paraffin-based phase change fillers are made from a mixture of expanded graphite and paraffin.

[0022] Furthermore, the fastening component includes a cloth tube, one end of which is fixed to one end face of the protective outer tube, and a rubber ring gasket for sealing is horizontally fixed inside the cloth tube on the side away from the protective outer tube. Multiple rope buckles are evenly fixed in the circumferential direction on the outer wall of the cloth tube on the side away from the protective outer tube, and binding straps are threaded through the multiple rope buckles of the cloth tube. The binding straps are used to bind the cloth tube and fix it to the cable.

[0023] Furthermore, a pressure frame is provided on one side of the fabric tube, and a pressure plate is horizontally provided inside the pressure frame. The pressure plate is vertically slidably assembled in the pressure frame. The two ends of the binding strap are inserted between the pressure frame and the pressure plate. A clamping bolt is vertically threaded through the top surface of the pressure frame, and the bottom end of the clamping bolt is rotatably connected to the top surface of the pressure plate.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. Active protection is achieved through a temperature-triggered fire extinguishing and cooling structure. When the cable joint temperature rises abnormally, the storage film ring bag tightly attached to the joint automatically ages, shrinks, and ruptures as the temperature rises, quickly releasing perfluorohexanone (PFH) extinguishing agent filler without manual intervention. After the PPHH vaporizes upon heating, it can quickly absorb a large amount of heat at the joint, reducing the joint temperature to a safe threshold in a short time, thus curbing the spread of fire at its source. On the other hand, the vaporized steam can quickly dilute the oxygen concentration between the joint and the high-temperature resistant rubber inner cylinder, reducing the oxygen content below the critical value for combustion, achieving asphyxiation extinguishing, improving the fire extinguishing success rate, and solving the problem of fire spread after the existing protective sleeve is damaged at high temperatures.

[0026] 2. A multi-layered oxygen barrier is constructed through a memory metal-triggered sealing structure, automatically sealing gaps and blocking oxygen supply. When the joint temperature rises, the memory metal ring expands and recovers upon heating, driving a cutter to cut the stored sealing ring and release the paraffin-based phase change filler. The filler expands upon heating and quickly fills the gap between the support cylinder and the cable, achieving a high filling rate. This not only completely blocks external oxygen from entering the high-temperature resistant rubber inner cylinder, preventing reignition at the joint, but also prevents the leakage of vaporized extinguishing agent from both sides, ensuring the continuity of the fire extinguishing and cooling effect. Compared to traditional protective sleeves without a sealing structure, the reignition rate is reduced.

[0027] 3. Pressure balance is achieved through an adaptive pressure relief structure. When the internal pressure rises due to the accumulation of vaporized gas, it can break through the sealing diaphragm with the weak line and enter the pressure relief channel, thereby pushing the sealing cap to slide up along the guide rod to relieve pressure. When the pressure drops to a safe range, the compression spring can drive the sealing cap to automatically reset and reseal the pressure relief cylinder, preventing external air from entering. This prevents the protective sleeve from breaking due to excessively high pressure and also prevents the sealing effect from being affected by excessively low pressure, ensuring the structural stability of the protective sleeve throughout the entire fire extinguishing process. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the overall structure of the present invention in an exploded state;

[0030] Figure 3 This is a schematic diagram of the protective component of the present invention in its disassembled state;

[0031] Figure 4 This is a schematic diagram of the cooling component of the present invention in its disassembled state;

[0032] Figure 5 For the present invention Figure 4 A schematic diagram of the airbag ring in its decomposed state;

[0033] Figure 6 For the present invention Figure 3 A schematic diagram of the venting component in its disassembled state;

[0034] Figure 7 This is a schematic diagram of the sealing component in the present invention in its disassembled state;

[0035] Figure 8 This is a schematic diagram of the fastening component in the present invention in its disassembled state.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1. Protective components; 11. Protective outer cylinder; 12. Pressure relief channel; 13. Reinforcing support ring; 14. Venting components; 141. Pressure relief cylinder; 142. Hole frame; 143. Sealing cap; 144. Venting hole; 145. Guide rod; 146. Compression spring; 2. Cooling components; 21. High-temperature resistant rubber inner cylinder; 22. Exhaust hole; 23. Sealing diaphragm; 24. Mounting groove; 25. Airbag ring; 26. Material storage film ring bag; 27. Extinguishing agent filler; 3. Sealing components; 31. Support cylinder; 32. Support rod ring; 33. Material storage sealing ring; 34. Memory metal ring; 35. Cutter; 36. Paraffin-based phase change filler; 4. Fastening components; 41. Cloth cylinder; 42. Rope buckle strap; 43. Rubber ring gasket; 44. Binding strap; 45. Pressure frame; 46. Pressure plate; 47. Compression bolt. Detailed Implementation

[0038] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0039] refer to Figures 1-5 As shown, a fireproof sleeve for a high-voltage cable joint with a rapid reignition suppression function includes a protective component 1, a cooling component 2, a sealing component 3, and a fastening component 4. By setting a protective outer cylinder 11, a high-temperature resistant rubber inner cylinder 21, a venting component 14, and a sealing component 3, these technical features work together to provide a fire protection measure for the high-voltage cable joint to rapidly suppress reignition.

[0040] The protective component 1 includes a protective outer cylinder 11, which is used to protect the high-voltage cable joint. Both the upper and lower sides of the protective outer cylinder 11 are equipped with venting components 14, which are used to guide and discharge high-pressure gas. Firstly, the protective outer cylinder 11, when used to protect the high-voltage cable joint, provides initial physical protection, preventing external flames from directly contacting the cable joint. Secondly, the venting components 14 can promptly guide and discharge the high-pressure gas generated at the cable joint, preventing the high-pressure environment from reducing the mechanical strength of the material and weakening the overall fireproof effect. The protective outer cylinder 11 has a cooling component 2 inside, and both ends of the protective outer cylinder 11 are fixedly assembled with fastening components 4. The fastening components 4 are used to fix the cable to the joint, and the fastening components 4 have a sealing component 3 inside. The sealing component 3 is used to seal the gap between the cable to the joint and the protective outer cylinder 11, ensuring a seal between the cable to the joint and the protective outer cylinder 11, and preventing the possibility of reignition caused by external flames entering through the gap. This structural design can not only quickly isolate the fire source at the joint, but also provide a certain fire extinguishing effect in the initial fire, effectively curbing the fire range and reducing the possibility of reignition;

[0041] The cooling component 2 includes a high-temperature resistant rubber inner cylinder 21, which is horizontally bonded to the inside of the protective outer cylinder 11 using silicone adhesive. An installation groove 24 is formed on the inner circumference of the high-temperature resistant rubber inner cylinder 21. An airbag ring 25 is horizontally bonded to the installation groove 24 of the high-temperature resistant rubber inner cylinder 21 using silicone adhesive. Multiple storage film rings 26 are sequentially and spaced along the cable axial direction on the inner wall of the airbag ring 25. The internal cavities of the multiple storage film rings 26 are sealed and filled with fire extinguishing agent filler 27. The airbag ring 25 and the storage film rings 26 inside the high-temperature resistant rubber inner cylinder 21 form a more efficient cooling system. Through the fire extinguishing agent filler 27 sealed in the storage film rings 26, the fire extinguishing agent can be quickly released to extinguish the fire in the event of an initial fire at the cable joint, preventing the fire from spreading.

[0042] Therefore, the above-mentioned technical features work together to effectively control the fire situation at the cable joint and quickly suppress the spread of the fire, preventing reignition.

[0043] refer to Figure 3 and Figure 4 As shown, a pressure relief channel 12 is provided on the inner circumference of the protective outer cylinder 11, and multiple reinforcing support rings 13 are embedded and fixed axially inside the protective outer cylinder 11. By providing the pressure relief channel 12, the pressure relief channel 12 guides gas to escape from the inside of the protective outer cylinder 11, thus releasing pressure when the internal pressure is too high. This effectively prevents the protective outer cylinder 11 from exploding or deforming due to excessive pressure, ensuring the safety of the equipment. Furthermore, the design of the pressure relief channel 12 also provides safety assurance for the equipment operating in high-pressure environments, extending the service life of the equipment. The embedded reinforcing support rings 13 enhance the structural strength of the protective outer cylinder 11, providing additional support when subjected to external pressure and improving the overall stability of the protective outer cylinder 11. The reinforcing support rings 13 enable the protective outer cylinder 11 to better resist deformation or damage when facing larger external forces, further improving the safety and reliability of the equipment.

[0044] The protective outer cylinder 11 is preferably made of neoprene rubber. The use of neoprene rubber in the protective outer cylinder 11 is due to its good elasticity and wear resistance, as well as its excellent stability and chemical resistance in harsh environments. Therefore, it provides excellent protective performance when subjected to external forces and environmental corrosion, ensuring the effective protective function of the protective outer cylinder 11 in actual use.

[0045] refer to Figure 3 and Figure 4As shown, multiple vent holes 22 are provided on both sides of the high-temperature resistant rubber inner cylinder 21, and these vent holes 22 are connected to the pressure relief channel 12 in the protective outer cylinder 11. Each vent hole 22 has a sealing film 23 horizontally bonded to it using silicone, and the sealing film 23 has a weak line engraved in its center. By providing vent holes 22 on both sides of the high-temperature resistant rubber inner cylinder 21 and connecting them to the pressure relief channel 12 in the protective outer cylinder 11, this design allows some pressure to be released into the pressure relief channel 12 through the vent holes 22 when the internal pressure of the equipment increases, thus preventing damage to the equipment due to excessive pressure. Specifically, the vent holes 22 allow excess gas or pressure to be discharged in a timely manner, helping to maintain the pressure balance of the entire system, thereby improving the safety and reliability of the equipment. The sealing diaphragm 23 is horizontally bonded to the vent 22 with silicone. The sealing diaphragm 23 has a weak line engraved in the middle, which can maintain a sealed state during normal operation of the equipment. When the internal pressure of the equipment reaches a certain critical value, the weak line will break first, thereby causing the sealing diaphragm 23 to fall off and release some pressure. At the same time, the vent 22 remains open and continues to release pressure through the pressure relief channel 12.

[0046] The high-temperature resistant rubber inner cylinder 21 is preferably made of silicone rubber. Silicone rubber has high temperature resistance, corrosion resistance and good sealing performance. This material enables the equipment to work stably in high-temperature environments, while ensuring good sealing of internal components, which helps to further improve the safety and reliability of the system.

[0047] refer to Figure 3 and Figure 6As shown, the venting component 14 includes a pressure relief tube 141 and a cap 143. The bottom end of the pressure relief tube 141 is vertically connected and fixed to the protective outer cylinder 11 by adhesive silicone. A perforated frame 142 is horizontally fixed to the bottom of the inner wall of the pressure relief tube 141. The cap 143 is vertically and movably inserted into the outside of the pressure relief tube 141. By setting the venting component 14, especially the technical features of the pressure relief tube 141 and the cap 143, the pressure relief tube 141, due to its structural design, can effectively guide the release of internal gas. Specifically, the bottom end of the pressure relief tube 141 is vertically connected and fixed to the protective outer cylinder 11 by adhesive silicone. This fixing method ensures the reliability of the connection between the pressure relief tube 141 and the protective outer cylinder 11, thereby guaranteeing its stability and safety during operation. Meanwhile, a perforated frame 142 is horizontally fixed to the bottom of the inner wall of the pressure relief cylinder 141. The perforated frame 142 serves as a gas release path, allowing gas to be smoothly discharged when the internal pressure is too high, thus avoiding safety hazards caused by excessive internal pressure. A vertically movable cap 143 is inserted into the outside of the pressure relief cylinder 141, giving it the ability to flexibly open and close. Under normal operating conditions, the cap 143 effectively prevents gas from escaping, maintaining stable internal pressure. When the internal pressure rises abnormally, the cap 143 automatically opens under the pressure of the gas, allowing gas to be released through the perforated frame 142 inside the pressure relief cylinder 141, thereby relieving pressure. This not only protects the equipment from damage caused by excessive internal pressure but also provides timely protection when equipment malfunctions, greatly improving the safety and reliability of the entire system.

[0048] refer to Figure 6As shown, a guide rod 145 is vertically fixed on the inner bottom surface of the cap 143. The guide rod 145 on the cap 143 is vertically slidably inserted into the hole frame 142, and multiple vent holes 144 are evenly distributed through the bottom of the outer circumference of the cap 143. A compression spring 146 is vertically sleeved on the outside of the guide rod 145, and the two ends of the compression spring 146 are respectively fixed to the bottom surface of the hole frame 142 and the bottom end surface of the guide rod 145. By setting the guide rod 145 vertically fixed on the inner bottom surface of the cap 143, the guide rod 145 can slide vertically along the hole of the hole frame 142, allowing the cap 143 to move up and down relative to the hole frame 142. The compression spring 146 is vertically sleeved on the outside of the guide rod 145, and the compression spring 146 is fixed at both ends to the bottom surface of the hole frame 142 and the bottom end surface of the guide rod 145, so that the cap 143 is kept in close contact with the hole frame 142 by the elastic force of the spring when not pressed. In this way, the multiple vent holes 144 evenly distributed through the bottom of the outer circumference of the cap 143 can effectively seal the holes on the orifice frame 142 when the cap 143 is not pressed down, preventing gas leakage and thus achieving a sealing effect. Furthermore, when pressure relief is needed, pressing the cap 143 moves it downwards, compressing the compression spring 146, thereby aligning the vent holes 144 of the cap 143 with the holes on the orifice frame 142, allowing gas to smoothly escape through the vent holes 144, thus achieving pressure relief.

[0049] refer to Figure 4 and Figure 5 As shown, the airbag ring 25 is filled with nitrogen, and the airbag ring 25 is preferably made of fluororubber. The reason why the nitrogen-filled airbag ring 25 can achieve this effect is that it has the function of inhibiting oxygen and preventing moisture and corrosive gases in the environment from penetrating. Fluororubber has good aging resistance. Traditional air may accelerate the aging of rubber materials, while nitrogen does not contain oxygen and can effectively extend the service life of the airbag ring 25.

[0050] The storage membrane ring bag 26 is preferably made of polypropylene, a material widely used due to its excellent physical and chemical properties. It has good wear resistance, effectively resisting mechanical friction and scratches, while also possessing excellent chemical corrosion resistance, effectively protecting the extinguishing agent from the influence of external chemicals. Therefore, the polypropylene storage membrane ring bag 26 not only prevents the extinguishing agent from leaking for a long time but also prevents the extinguishing agent from contacting pollutants in the external environment, ensuring that the extinguishing agent can exert its maximum effectiveness at critical moments. Furthermore, when the temperature rises, the polypropylene storage membrane ring bag 26 becomes brittle and ruptures, thereby releasing the storage membrane ring bag 26.

[0051] The extinguishing agent filler 27 is preferably made of perfluorohexanone (PFH). PFH, as a major component of extinguishing agents, is used in professional and demanding firefighting scenarios due to its exceptional properties. It possesses excellent thermal conductivity, rapidly dissipating heat from the vicinity of the fire source, thereby lowering the temperature and interrupting the combustion chain reaction. Simultaneously, PFH does not decompose into harmful substances at high temperatures, effectively preventing the generation of toxic gases in the fire. Therefore, as a highly efficient extinguishing agent filler 27, PFH not only rapidly extinguishes initial fires but also effectively inhibits the further spread of fire, improving the overall efficiency and safety of firefighting.

[0052] refer to Figure 7 As shown, the sealing component 3 includes a support cylinder 31. One end of the support cylinder 31 is horizontally bonded to one end face of the protective outer cylinder 11 using silicone adhesive. A support rod ring 32 is horizontally bonded to the inside of the support cylinder 31, away from the protective outer cylinder 11, using silicone adhesive. Support columns are uniformly and horizontally fixed to the end face of the support rod ring 32 near the protective outer cylinder 11, and a storage sealing ring 33 is inserted into the support column of the support rod ring 32. The storage sealing ring 33 is filled with paraffin-based phase change filler 36. By setting up a sealing component with a support cylinder 31 and a support rod ring 32, and with one end of the support cylinder 31 horizontally bonded to one end face of the protective outer cylinder 11 using silicone adhesive, this design increases the firm connection between the sealing component and the protective outer cylinder, enhancing the stability of the overall structure. The support rod ring 32 is located at the other end of the support cylinder 31 and is also horizontally bonded to the support cylinder 31 using silicone adhesive, further strengthening the structural strength of the entire device. Evenly fixed supports are mounted on the support ring 32. These supports provide a stable position for the storage sealing ring 33, preventing it from moving easily. The storage sealing ring 33 can slide freely on the supports. By adjusting the position of the storage sealing ring 33, the sealing range can be precisely controlled, ensuring a sealing effect. The storage sealing ring 33 is filled with paraffin-based phase change filler 36. This filler has a large heat capacity and latent heat of phase change, enabling it to absorb and store a large amount of heat. Specifically, when the ambient temperature rises, the paraffin-based phase change filler inside the storage sealing ring 33 will gradually melt.

[0053] refer to Figure 7As shown, a shape memory metal ring 34 is horizontally bonded to the inner storage sealing ring 33 of the support cylinder 31 near the outer protective cylinder 11 by silicone. Multiple cutters 35 are uniformly and horizontally fixed on the side of the shape memory metal ring 34 near the storage sealing ring 33. When the temperature at the joint of the high-voltage cable rises, it is conducted through the air to the sealing member 34. The heated shape memory metal ring 34 recovers and extends, causing the cutters 35 on it to extend toward the storage sealing ring 33, cutting the storage sealing ring 33 and causing it to break. The paraffin-based phase change filler 36 filled in it expands when heated. The expanded paraffin-based phase change filler 36 fills the gap between the support cylinder 31 and the high-voltage cable. On the one hand, it prevents external oxygen from entering the high-temperature resistant rubber inner cylinder 21, increasing the possibility of reignition of the high-voltage cable joint. On the other hand, it prevents the vaporized gas from being discharged from both sides, which would cause the stability of the high-voltage cable to deteriorate.

[0054] The storage sealing ring 33 is made of polystyrene film. Polystyrene film has good flexibility and sealing properties, and can fit tightly to the edge of the storage space to form an effective barrier.

[0055] The paraffin-based phase change filler 36 is made of a mixture of expanded graphite and paraffin. The expanded graphite and paraffin undergo a phase change at a specific temperature, which allows the filler material to absorb heat and expand when needed, thereby sealing the gap between the filler cylinder 31 and the high-voltage cable.

[0056] refer to Figure 2 and Figure 8 As shown, the fastening component 4 includes a cloth tube 41. One end of the cloth tube 41 is horizontally bonded to one end face of the protective outer tube 11 with silicone. A rubber ring gasket 43 for sealing is horizontally bonded to the inside of the cloth tube 41 on the side away from the protective outer tube 11 with silicone. Multiple rope buckles 42 are evenly bonded to the outer wall of the cloth tube 41 along the circumferential direction with silicone on the side away from the protective outer tube 11. Binding straps 44 are threaded through the rope buckles 42 of the cloth tube 41. The binding straps 44 are used to bind the cloth tube 41 and fix it to the cable. By setting the cloth tube 41 and the rubber ring gasket 43 inside, the cloth tube 41, due to its soft and elastic material, can fit tightly against the cable, and the rubber ring gasket 43 provides a good seal, preventing moisture and other impurities from penetrating into the cable. Simultaneously, by setting the rope buckles 42 on the outer wall of the cloth tube 41 and threading the binding straps 44 through them, the binding straps 44 can be adjusted appropriately to tightly bind the cloth tube 41, thereby fixing it to the cable. These rope straps 42, under the action of the binding straps 44, can ensure that the cloth tube 41 is firmly fixed to the cable and is not affected by external tension and torsional forces.

[0057] refer to Figure 8As shown, a pressure frame 45 is provided on one side of the fabric tube 41. A pressure plate 46 is horizontally arranged inside the pressure frame 45. The pressure plate 46 is vertically slidably assembled in the pressure frame 45. The two ends of the binding strap 44 pass through the pressure frame 45 and the pressure plate 46. A clamping bolt 47 is vertically threaded through the top surface of the pressure frame 45, and the bottom end of the clamping bolt 47 is rotatably connected to the top surface of the pressure plate 46. By setting up the pressure frame 45 and vertically sliding the pressure plate 46 inside the pressure frame 45, and with the two ends of the binding strap 44 passing through the pressure frame 45 and the pressure plate 46, this design allows the fabric tube 41 to achieve good fixation and binding of materials mechanically during use. Since the pressure plate 46 can slide freely in the vertical direction, and the pressure frame 45 has a clamping bolt 47 at the top, with the bottom end of the clamping bolt 47 connected to the top of the pressure plate 46 and fixed by a threaded structure, the vertical position of the pressure plate 46 can be precisely adjusted. This working principle ensures that the binding strap 44 can adapt to materials of different sizes and shapes, providing a more uniform and stable fixation. Specifically, the user can adjust the clamping bolt 47 according to actual needs to compress the pressure applied to the material by the pressure plate 46, thereby ensuring that the material will not loosen or fall off during transportation and operation.

[0058] The working principle of this invention is as follows: In use, firstly, the protective component 1, cooling component 2, sealing component 3, and fastening component 4 are integrated into a single assembly. Then, a layer of silicone rubber is applied to the outer wall of multiple storage film rings 26 filled with liquid fire extinguishing agent filler 27. Next, the silicone-coated rings are sequentially and laterally bonded to the inner wall of the airbag ring 25 at intervals. Then, a layer of silicone rubber is applied to the outer wall of the airbag ring 25. The airbag ring 25 is then inserted into the mounting groove 24 of the high-temperature resistant rubber inner cylinder 21 and fixed using silicone rubber. Finally, the inner circumferential surfaces of the protective outer cylinder 11 in the protective component 1 are... All ends are coated with silicone liquid. The high-temperature resistant rubber inner cylinder 21 of the cooling component 2 is inserted into the protective outer cylinder 11. After a certain period of time, the cooling component 2 is bonded and assembled in the protective component 1. Similarly, the support cylinder 31 of the sealing component 3 is bonded to the outer end face of the protective outer cylinder 11 with silicone. At the same time, the cloth cylinder 41 of the fastening component 4 is sleeved on the outside of the support cylinder 31. One end of the cloth cylinder 41 is fixed to the outer end face of the protective outer cylinder 11 with silicone liquid. Thus, the integrated assembly of the protective component 1, the cooling component 2, the sealing component 3 and the fastening component 4 is completed.

[0059] Then, the integrated high-temperature resistant rubber inner cylinder 21 is fitted onto the joint of the high-voltage cable. The air bladder ring 25 inside the high-temperature resistant rubber inner cylinder 21 is squeezed by the high-voltage cable joint, causing the air bladder ring 25 to deform. The deformation of the air bladder ring 25 pushes the multiple storage film rings 26 inside to press against the joint of the high-voltage cable. At the same time, the sealing components 3 at both ends of the high-temperature resistant rubber inner cylinder 21 are respectively fitted onto the outer walls of the two cable joints. Finally, the binding strap 44 is threaded through the rope buckle 42 of the cloth cylinder 41 in the fastening component 4. The binding strap 44 tightly binds the rubber ring pad 43 in the inner wall of the cloth cylinder 41 to press against the outer walls of the two cable joints. In order to ensure that the binding strap 44 tightly binds the cloth cylinder 41, the two ends of the binding strap 44 are passed through the pressure frame 45. Then, the pressure bolt 47 is rotated to push the pressure plate 46 to slide vertically down in the pressure frame 45, squeezing the two ends of the binding strap 44 to keep the binding tight and stable in the pressure frame 45, thus completing the protective installation at the joint of the high-voltage cable.

[0060] During use, when the temperature at the high-voltage cable joint rises, the storage film ring 26 tightly attached to the joint ages, shrinks, and ruptures due to heat, causing the fire extinguishing agent filler 27 inside to spill out. The fire extinguishing agent filler 27 is made of perfluorohexanone. When heated, the fire extinguishing agent filler 27 vaporizes, absorbing heat from the high-voltage cable joint, reducing the temperature at the high-voltage cable joint, and reducing the possibility of reignition at the high-voltage cable joint. Then, the vapor generated by vaporization dilutes the oxygen present at the high-voltage cable joint and the high-temperature resistant rubber inner cylinder 21, further reducing the possibility of reignition at the high-voltage cable joint. At the same time, the temperature rise at the high-voltage cable joint is conducted through the air to contact the shape memory metal ring 34 in the sealing component 3. The heated shape memory metal ring 34 recovers and extends, causing the cutter 35 on it to extend towards the storage sealing ring 33, cutting and rupturing the storage sealing ring 33. The paraffin-based phase change filler 36 filled inside expands when heated. The expanded paraffin-based phase change filler 36 The gap between the filler cylinder 31 and the high-voltage cable serves two purposes: firstly, it prevents external oxygen from entering the high-temperature resistant rubber inner cylinder 21, increasing the possibility of reignition at the high-voltage cable joint; secondly, it prevents the vaporized gas from impacting the high-voltage cable and causing instability. Finally, when the vaporized gas is discharged from the vent holes 22 on both sides of the high-temperature resistant rubber inner cylinder 21, the increased air pressure causes the sealing diaphragm 23 with the weak wire to rupture. The vaporized gas enters the pressure relief channel 12 between the high-temperature resistant rubber inner cylinder 21 and the protective outer cylinder 11. The increased air pressure pushes the cap 143 to slide vertically upward on the guide rod 145 in the hole holder 142 in the pressure relief tube 141, pulling the compression spring 146 to deform. When the vent hole 144 on the cap 143 is unobstructed, the vaporized gas is discharged from the vent hole 144. When the air pressure in the pressure relief channel 12 decreases, the deformation force of the compression spring 146 causes the cap 143 to be re-sleeved on the pressure relief tube 141, preventing external air from entering.

[0061] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A fireproof sleeve for a high-voltage cable joint with rapid reignition suppression function, characterized in that, It includes protective components (1), cooling components (2), sealing components (3) and fastening components (4); The protective component (1) includes a protective outer cylinder (11), which is used to protect the high-voltage cable joint. The upper and lower sides of the protective outer cylinder (11) are connected and assembled with venting components (14), which are used to guide and discharge high-pressure gas. The cooling component (2) is provided inside the protective outer cylinder (11), and the fastening component (4) is fixedly assembled at both ends of the protective outer cylinder (11). The fastening component (4) is used to fix it on the joint cable, and the sealing component (3) is provided inside the fastening component (4). The sealing component (3) is used to seal the gap between the joint cable and the protective outer cylinder (11). The cooling component (2) includes a high-temperature resistant rubber inner cylinder (21), which is horizontally fixed inside the protective outer cylinder (11). An installation groove (24) is provided on the inner circumferential surface of the high-temperature resistant rubber inner cylinder (21). An airbag ring (25) is horizontally fixed in the installation groove (24) of the high-temperature resistant rubber inner cylinder (21). Multiple storage film ring bags (26) are arranged sequentially and spaced along the axial direction of the cable on the inner wall of the airbag ring (25). The internal cavities of the multiple storage film ring bags (26) are all sealed and filled with fire extinguishing agent filler (27).

2. A fireproof sleeve for a high-voltage cable joint with rapid reignition suppression function as described in claim 1, characterized in that: The protective outer cylinder (11) has a pressure relief channel (12) on its inner circumferential surface, and multiple reinforcing support rings (13) are embedded and fixed inside the protective outer cylinder (11) along the axial direction. The protective outer cylinder (11) is preferably made of neoprene rubber.

3. A fireproof sleeve for a high-voltage cable joint with rapid reignition suppression function as described in claim 2, characterized in that: The high-temperature resistant rubber inner cylinder (21) has multiple vent holes (22) through both sides, and the multiple vent holes (22) of the high-temperature resistant rubber inner cylinder (21) are connected to the pressure relief channel (12) in the protective outer cylinder (11). Each of the multiple vent holes (22) of the high-temperature resistant rubber inner cylinder (21) has a sealing film (23) fixed in it, and the sealing film (23) has a weak line engraved in the middle. The high-temperature resistant rubber inner cylinder (21) is preferably made of silicone rubber.

4. A fireproof sleeve for a high-voltage cable joint with rapid reignition suppression function as described in claim 1, characterized in that: The venting component (14) includes a pressure relief tube (141) and a cap (143). The bottom end of the pressure relief tube (141) is vertically connected and fixed on the protective outer cylinder (11), and a hole frame (142) is horizontally fixed at the bottom of the inner wall of the pressure relief tube (141). The cap (143) is vertically movable and inserted into the outside of the pressure relief tube (141).

5. A fireproof sleeve for a high-voltage cable joint with rapid reignition suppression function according to claim 4, characterized in that: A guide rod (145) is vertically fixed on the inner bottom surface of the cap (143). The guide rod (145) on the cap (143) is vertically slidably inserted into the hole frame (142). Multiple vent holes (144) are evenly opened through the bottom of the outer circumference of the cap (143). A compression spring (146) is vertically sleeved on the outside of the guide rod (145). The two ends of the compression spring (146) are respectively fixed on the bottom surface of the hole frame (142) and the bottom end surface of the guide rod (145).

6. A fireproof sleeve for a high-voltage cable joint with rapid reignition suppression function as described in claim 1, characterized in that: The airbag ring (25) is filled with nitrogen gas, and the airbag ring (25) is preferably made of fluororubber. The storage film ring bag (26) is preferably made of polypropylene; The fire extinguishing agent filler (27) is preferably made of perfluorohexanone.

7. A fireproof sleeve for a high-voltage cable joint with rapid reignition suppression function as described in claim 1, characterized in that: The sealing component (3) includes a support cylinder (31), one end of which is fixed to one end face of the protective outer cylinder (11), and a support rod ring (32) is fixed inside the support cylinder (31) on the side away from the protective outer cylinder (11). A support column is uniformly and horizontally fixed on one end face of the support rod ring (32) near the protective outer cylinder (11), and a storage sealing ring (33) is inserted on the support column of the support rod ring (32). The storage sealing ring (33) is filled with paraffin-based phase change filler (36).

8. A fireproof sleeve for a high-voltage cable joint with rapid reignition suppression function according to claim 7, characterized in that: The internal storage sealing ring (33) of the support cylinder (31) is fixed with a memory metal ring (34) on the side near the protective outer cylinder (11), and multiple cutters (35) are evenly and horizontally fixed on the side of the memory metal ring (34) near the storage sealing ring (33). The storage sealing ring (33) is made of polystyrene film; The paraffin-based phase change filler (36) is made of a mixture of expanded graphite and paraffin.

9. A fireproof sleeve for a high-voltage cable joint with rapid reignition suppression function according to claim 1, characterized in that: The fastening component (4) includes a cloth tube (41), one end of which is fixed to one end face of the protective outer tube (11), and a rubber ring gasket (43) for sealing is horizontally fixed inside the cloth tube (41) on the side away from the protective outer tube (11). Multiple rope buckles (42) are evenly fixed along the circumferential direction on the outer wall of the cloth tube (41) on the side away from the protective outer tube (11), and binding straps (44) are threaded through the multiple rope buckles (42) of the cloth tube (41). The binding straps (44) are used to bind the cloth tube (41) and fix it to the cable.

10. A fireproof sleeve for a high-voltage cable joint with rapid suppression of reignition as described in claim 9, characterized in that: A pressure frame (45) is provided on one side of the cloth tube (41), and a pressure plate (46) is horizontally provided inside the pressure frame (45). The pressure plate (46) is vertically slidably assembled in the pressure frame (45). The two ends of the binding strap (44) are inserted between the pressure frame (45) and the pressure plate (46). A clamping bolt (47) is vertically threaded through the top surface of the pressure frame (45), and the bottom end of the clamping bolt (47) is rotatably connected to the top surface of the pressure plate (46).

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