A cable head stress cone

Abstract

The application discloses a cable head stress cone, which belongs to the technical field of cable head protection equipment. The device comprises an insulating adhesive body, a heat-treated ceramic insulating inner sleeve, the insulating inner sleeve comprising two oppositely arranged insulating inner half tubes, the two insulating inner half tubes being sealingly connected through the insulating adhesive body, a heat-insulating interlayer pipe assembly, the heat-insulating interlayer pipe assembly being sleeved on the outer circumferential side of the insulating inner sleeve, the heat-insulating interlayer pipe assembly comprising at least one pair of oppositely arranged heat-insulating half tubes, the two heat-insulating half tubes being sealingly connected through the insulating adhesive body, and a protective sleeve, the protective sleeve being sleeved on the circumferential side of the heat-insulating interlayer pipe assembly. When the insulating inner sleeve is subjected to high temperature, the insulating inner sleeve is heat-treated to be ceramic, so that the electric breakdown is prevented; the heat-insulating interlayer pipe assembly can buffer the internal thermal stress, and the insulating inner sleeve can reduce the temperature gradient difference, so that the possibility of thermal breakdown is reduced; and the multi-pipe sleeve connection forms the cable head stress cone, the diameter of which gradually decreases to provide protection on the external mechanical structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable head protection equipment, and particularly relates to a cable head stress cone. BACKGROUND

[0002] The cable joint is used for locking and fixing the incoming and outgoing lines. When the cable is jointed, the original insulation layer of the cable is damaged. The cold shrink tube is used to replace the original insulation layer. In the process of operation of the cable head under high temperature and high voltage, the stress cone of the cable head is prone to breakdown defects. In some prior art, a whole stress cone structure is designed. The structure has too high rigidity and is prone to concentrated stress points under the action of circuit faults such as short circuit, flashover breakdown and the like, thereby causing concentrated stress cracking or falling off and the like. In another prior art, when the stress cone is subjected to high temperature, the internal structure is prone to damage due to too large temperature gradient, thereby causing thermal breakdown. In other prior art, the insulation performance is prone to degradation under high temperature environment, thereby causing electric breakdown. In addition, unscientific production process or improper installation of the technical personnel can cause mechanical breakdown of the cable. The above defects can further induce partial discharge and even breakdown failure, thereby damaging other electrical equipment and causing losses due to the cable joint failure. SUMMARY

[0003] The present application provides a cable head stress cone, which aims to solve the problem that the existing cable head stress cone is prone to breakdown defects, so as to improve the insulation protection capability of the cable head.

[0004] The present application provides a cable head stress cone, which comprises:

[0005] An insulation adhesive body;

[0006] A heat-ceramized insulation inner sleeve pipe, the insulation inner sleeve pipe comprises two oppositely arranged insulation inner half pipes, the two insulation inner half pipes are sealingly connected through the insulation adhesive body, and the material composition of the insulation inner sleeve pipe comprises any one of heat-ceramized silicone rubber and heat-ceramized polyolefin;

[0007] A heat insulation interlayer pipe assembly, the heat insulation interlayer pipe assembly is sleeved on the outer circumferential side of the insulation inner sleeve pipe, the heat insulation interlayer pipe assembly comprises at least one pair of oppositely arranged heat insulation half pipes, and the two heat insulation half pipes are sealingly connected through the insulation adhesive body;

[0008] A protective sleeve pipe, the protective sleeve pipe is sleeved on the outer side of the circumferential side of the heat insulation interlayer pipe assembly;

[0009] The insulation inner sleeve pipe, the heat insulation interlayer pipe assembly and the protective sleeve pipe are sequentially sleeved to form the cable head stress cone, and the diameter of the cable head stress cone gradually decreases at least partially.

[0010] In one of the embodiments, the insulating adhesive body comprises encapsulation glue and reinforcing glue for insulating and heat-proofing;

[0011] In the direction from the insulating inner sleeve to the heat-proofing sandwich pipe assembly, the insulating adhesive body comprises, in sequence, an inner encapsulation glue layer, a reinforcing glue layer and an outer encapsulation glue layer;

[0012] Both the inner encapsulation glue layer and the outer encapsulation glue layer are composed of the encapsulation glue;

[0013] The reinforcing glue layer is composed of the reinforcing glue.

[0014] In one of the embodiments, the reinforcing glue and the material of the insulating inner sleeve are of the same kind.

[0015] In one of the embodiments, the material component of the insulating inner sleeve comprises heat-activated ceramicized silicone rubber;

[0016] The material component of the reinforcing glue comprises silicone rubber and fillers, and the fillers comprise one or more of calcium carbonate, talcum powder, mica powder and glass fiber.

[0017] In one of the embodiments, the heat-proofing sandwich pipe assembly comprises at least two pairs of the heat-proofing half-pipes;

[0018] One pair of the heat-proofing half-pipes are both inner heat-proofing half-pipes, and the two inner heat-proofing half-pipes are oppositely arranged to form an inner heat-proofing pipe, which is sleeved outside the circumferential side of the insulating inner sleeve and is used for absorbing heat from the inside;

[0019] One pair of the heat-proofing half-pipes are both outer heat-proofing half-pipes, and the two outer heat-proofing half-pipes are oppositely arranged to form an outer heat-proofing pipe, which is sleeved outside the circumferential side of the inner heat-proofing pipe and is used for insulating heat from the outside.

[0020] In one of the embodiments, a plurality of reinforcing strips are arranged between the inner heat-proofing pipe and the outer heat-proofing pipe, the plurality of reinforcing strips are fixed to the inner wall of the outer heat-proofing pipe, and the plurality of reinforcing strips are regularly arranged in the circumferential direction.

[0021] In one of the embodiments, the vertical cross-sectional profile shape of the reinforcing strip matches the vertical cross-sectional profile shape of the outer heat-proofing half-pipe, and the plurality of reinforcing strips are regularly arranged in the circumferential direction around the outer heat-proofing pipe.

[0022] In one of the embodiments, the material component of the inner heat-proofing half-pipe comprises one or more of cross-linked polyethylene and nano-modified polyethylene;

[0023] The material component of the outer heat-proofing half-pipe comprises one or more of polyimide and polyimide mixed with ceramic particles or heat-conducting insulating fillers.

[0024] In one of the embodiments, the insulating inner sleeve comprises, in sequence, a narrow-diameter tube segment, a tapered tube segment and a wide-diameter tube segment; the narrow-diameter tube segment is connected with the wide-diameter tube segment through the tapered tube segment.

[0025] In one of the embodiments, the thermal barrier tube assembly and the protective sleeve are both shape-matched with the insulating inner sleeve.

[0026] From the above technical solutions, the present application has the following advantages:

[0027] The cable head stress cone provided by the embodiment has the following advantages: firstly, the insulating inner sleeve and the thermal barrier tube assembly are both formed by bonding of half tubes, so that the cable head stress cone has higher flexibility and adaptability, and the situation of cracking due to excessive rigidity and concentrated stress is avoided; secondly, the insulating inner sleeve has the characteristic of ceramicization under heat, and when high temperature occurs due to circuit faults such as short circuit and flashover breakdown, the insulating inner sleeve will harden into a ceramic shape to form a good insulating barrier around the cable head, so that the cable conductor is isolated from the external environment, that is, the ceramicized insulating inner sleeve can physically isolate the electric arc to prevent electric breakdown caused by insufficient insulation, thereby protecting the joint and surrounding equipment from further damage and preventing the occurrence of electric breakdown; thirdly, the ceramicization of the insulating inner sleeve can preliminarily isolate heat, and the thermal barrier tube assembly can secondarily isolate heat, so that the insulating inner sleeve and the thermal barrier tube assembly can reduce the temperature gradient difference inside, thereby avoiding the situation of thermal breakdown; and finally, the protective sleeve physically protects the overall structure against external impact and environmental erosion, and the cable head stress cone part formed by the multiple tube sleeves has a gradually decreasing diameter to provide protection on the external mechanical structure. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0029] Figure 1 A schematic diagram of the overall structure of the cable head stress cone provided by the embodiment of the present application is shown in the following figure:

[0030] Figure 2 A schematic diagram of the structure of the cable head stress cone (without the protective sleeve) provided by the embodiment of the present application is shown in the following figure:

[0031] Figure 3 An exploded schematic diagram of the cable head stress cone (without the protective sleeve) provided by the embodiment of the present application is shown in the following figure:

[0032] Figure 4 A structure diagram of an insulating adhesive body of a cable head stress cone provided by the embodiment of the present application is shown in the figure.

[0033] Figure 5 A cross-sectional structure diagram of a cable head stress cone provided by the embodiment of the present application is shown in the figure.

[0034] Figure 6 A structure diagram of a reinforcing strip of a cable head stress cone provided by the embodiment of the present application is shown in the figure.

[0035] Reference signs:

[0036] 1, insulating adhesive body; 10, inner sealing adhesive layer; 11, reinforcing adhesive layer; 12, outer sealing adhesive layer; 2, insulating inner sleeve; 20, insulating inner half sleeve; 21, narrow-diameter tube segment; 22, conical tube segment; 23, wide-diameter tube segment; 3, thermal insulation interlayer tube assembly; 30, inner thermal insulation tube; 300, inner thermal insulation half tube; 31, outer thermal insulation tube; 310, outer thermal insulation half tube; 32, reinforcing strip; 4, protective sleeve. DETAILED DESCRIPTION

[0037] The embodiment of the present application provides a cable head stress cone, and the technical problem of easy breakdown defects of the existing cable head stress cone is solved.

[0038] In order to make the application purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the following described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0039] Please refer to Figures 1 to 6 The present application provides a cable head stress cone, which comprises:

[0040] an insulating adhesive body 1;

[0041] a heat-ceramized insulating inner sleeve 2, the heat-ceramized insulating inner sleeve 2 comprises two oppositely arranged insulating inner half sleeves 20, the two insulating inner half sleeves 20 are sealingly connected through the insulating adhesive body 1, and the material composition of the heat-ceramized insulating inner sleeve 2 comprises any one of heat-ceramized silicone rubber and heat-ceramized polyolefin;

[0042] a thermal insulation interlayer tube assembly 3, the thermal insulation interlayer tube assembly 3 is sleeved on the outer circumferential side of the heat-ceramized insulating inner sleeve 2, and the thermal insulation interlayer tube assembly 3 comprises at least one pair of oppositely arranged thermal insulation half tubes, and the two thermal insulation half tubes are sealingly connected through the insulating adhesive body 1;

[0043] A protective sleeve 4 is sleeved on the outer circumferential side of the thermal insulation sandwich pipe assembly 3.

[0044] The cable head stress cone formed by the sleeving of the insulating inner sleeve 2, the thermal insulation sandwich pipe assembly 3 and the protective sleeve 4 has a gradually reduced diameter.

[0045] In the working process of the embodiment, when the cable head stress cone is sleeved on the cable head, and the cable head has a serious fault such as short circuit, flashover breakdown, etc. accompanied by high temperature, the insulating inner sleeve 2 will be ceramicized when it is heated, the ceramicized insulating inner sleeve 2 can form physical isolation to the electric arc, protect the joint and the surrounding equipment from further damage by the electric arc, and prevent the occurrence of electric breakdown; the thermal insulation sandwich pipe assembly 3 can buffer the internal thermal stress, and cooperate with the insulating inner sleeve 2 to reduce the temperature gradient difference inside, thereby reducing the possibility of thermal breakdown; the protective sleeve 4 provides support and protection on the external mechanical structure, and the cable head stress cone formed by the sleeving of multiple pipes has a gradually reduced diameter to provide protection on the external mechanical structure, thereby avoiding damage to the internal structure of the cable head and the cable head stress cone caused by external force interference.

[0046] Compared with the prior art, the embodiment has the following advantages: first, it is not easy to crack under concentrated stress. The cable head stress cone of the embodiment adopts a split half-pipe structure design, and the two half-pipes are bonded by the insulating adhesive 1. The insulating adhesive 1 can deform to a certain extent and buffer external force, so that the stress cone as a whole can better adapt to changes in external force, exhibit higher flexibility, have higher flexibility and adaptability, reduce stress concentration, and improve the durability and reliability of the overall structure, thereby optimizing the balance between protection performance and service life, avoiding the use of a complete pipe in the prior art, which has poor flexibility and adaptability, and is prone to have a concentrated stress point under external impact or stress, thereby increasing the risk of damage; second, it is not easy to have electric breakdown. The insulating inner sleeve 2 abutting against the cable head has the characteristic of being ceramicized when heated. When the cable head has a serious fault such as short circuit, flashover breakdown, etc. accompanied by high temperature, the insulating inner sleeve 2 will be ceramicized, still maintaining good insulation performance, and preventing the occurrence of electric breakdown; third, it is not easy to have thermal breakdown. The insulating inner sleeve 2 of the embodiment can preliminarily insulate heat, the thermal insulation sandwich pipe assembly 3 can secondarily insulate heat, and the cooperation of the insulating inner sleeve 2 and the thermal insulation sandwich pipe assembly 3 can reduce the temperature gradient difference inside, thereby avoiding the occurrence of thermal breakdown due to a large temperature gradient in the single insulation layer of the prior art; fourth, it is not easy to be damaged when subjected to external force interference. The protective sleeve 4 of the outermost layer of the cable head stress cone of the embodiment can physically protect the overall structure and resist external impact and environmental erosion; fifth, it is easy to install. The half-pipe structure of the embodiment has higher flexibility in the installation process, can flexibly adjust the installation method or installation process, and is convenient to install and maintain.

[0047] Therefore, the stress cone of the embodiment can reduce the breakdown problems of traditional stress cones such as concentrated stress cracking, electrical breakdown, thermal breakdown and mechanical breakdown, effectively optimize the protection performance of the cable head stress cone through the three-layer pipe body, has good anti-breakdown effect, can still maintain structural integrity and mechanical strength in a high-temperature and high-voltage environment, and significantly reduces the risk of equipment damage and power system interruption.

[0048] In a specific embodiment, as shown in Figure 3 and Figure 5 , a realizable structure of the insulating inner sleeve 2 is further provided, the insulating inner sleeve 2 formed by two insulating inner half pipes 20 includes a narrow-diameter pipe section 21, a conical pipe section 22 and a wide-diameter pipe section 23 in sequence; the narrow-diameter pipe section 21 is connected with the wide-diameter pipe section 23 through the conical pipe section 22, and in specific implementation, the narrow-diameter pipe section 21 serves as a crimping position of the cable head, and the wide-diameter pipe section 23 serves as an arc pressure relief channel of the electric arc; when the cable head appears short circuit or flashover breakdown, the electric arc will be shot to the ground through the arc pressure relief channel, without affecting the adjacent electrical equipment, thereby reducing the equipment loss; and the structure of the conical pipe section 22 with the upper small and the lower large can enhance the structural strength of the entire cable head stress cone.

[0049] In an embodiment, the arc pressure relief channel adopts a controllable directional pressure relief structure to reduce the influence of pressure relief on the ground environment and further improve the overall performance.

[0050] In an embodiment, the material component of the insulating inner sleeve 2 is heat-activated ceramicized silicone rubber; in specific implementation, the insulating inner sleeve 2 will be ceramicized when heated, the ceramicized insulating inner sleeve 2 can form physical isolation to the electric arc, and the ceramicized insulating inner sleeve 2 has the following two advantages: first, the material can be hardened into a ceramic shape at high temperature (650℃-3000℃), which can provide additional mechanical strength and thermal protection, thereby forming physical isolation when a high-temperature electric arc is caused by cable failure, and protecting the sleeve of the joint and stress cone or the surrounding equipment from further damage; second, such material has excellent sealing and insulation properties, can maintain the stability of the connection for a long time under normal temperature conditions, and provides reliable secondary protection under extreme conditions, thereby significantly improving the overall safety and reliability of the system.

[0051] In the embodiment, the heat-activated ceramicized silicone rubber will be hardened into a ceramic shape at 650℃-3000℃, specifically, the material of the heat-activated ceramicized silicone rubber is TCG-70 special silicone rubber material; in specific implementation, when the cable head appears short circuit arc or flashover arc, the accompanying temperature is 2000℃-3000℃, and the ceramicization trigger temperature of the heat-activated ceramicized silicone rubber is 650℃-3000℃, which covers the common temperature of short circuit arc and flashover arc, thereby ensuring daily use.

[0052] In a specific embodiment, as shown in Figure 2 and Figure 3 Further provided is an implementable structure of the thermal insulation sandwich pipe assembly 3, which comprises at least two pairs of thermal insulation half-pipes; one pair of thermal insulation half-pipes are both inner thermal insulation half-pipes 300, the two inner thermal insulation half-pipes 300 are oppositely arranged and bonded by the insulating adhesive body 1 to form an inner thermal insulation pipe 30, the inner thermal insulation pipe 30 is sleeved outside the circumferential side of the insulating inner sleeve pipe 2, and the inner thermal insulation pipe 30 is used to absorb the heat on the inner side; one pair of thermal insulation half-pipes are both outer thermal insulation half-pipes 310, the two outer thermal insulation half-pipes 310 are oppositely arranged and bonded by the insulating adhesive body 1 to form an outer thermal insulation pipe 31, the outer thermal insulation pipe 31 is sleeved outside the circumferential side of the inner thermal insulation pipe 30, and the outer thermal insulation pipe 31 is used to insulate the heat on the outer side; in specific implementation, the insulating inner sleeve pipe 2 serves as the first thermal insulation layer, the inner thermal insulation layer serves as the second thermal insulation layer, and the outer thermal insulation layer serves as the third thermal insulation layer, so that the three thermal insulation layers can increase the effect of gradient thermal insulation, and the multi-layer division can significantly slow down the thermal gradient influence and impact force conduction, so that the entire sheath has higher durability and protection performance under harsh conditions, and thermal breakdown damage caused by excessive temperature gradient of the traditional stress cone with only a single thermal insulation layer can be avoided.

[0053] In an embodiment, as shown in Figure 2 and Figure 3 The material composition of the inner thermal insulation half-pipe 300 comprises one or more of cross-linked polyethylene and nano-modified polyethylene, for example, the inner thermal insulation half-pipe 300 can be composed of cross-linked polyethylene, the inner thermal insulation half-pipe 300 can also be composed of nano-modified polyethylene (nano-enhanced polyethylene), and the inner thermal insulation half-pipe 300 can also be composed of a combination of cross-linked polyethylene and nano-modified polyethylene; in specific implementation, the inner thermal insulation half-pipe 300 can maintain stable performance in a high-temperature environment, while providing additional support for the subsequent sleeve pipe, effectively enhancing thermal stability and electrical performance.

[0054] In an embodiment, as shown in Figure 2 and Figure 3 The material composition of the outer thermal insulation half-pipe 310 comprises one or more of polyimide and polyimide mixed with ceramic particles or heat-conducting insulating fillers, for example, the outer thermal insulation half-pipe 310 can be composed of polyimide, the outer thermal insulation half-pipe 310 can also be composed of polyimide mixed with ceramic particles, the outer thermal insulation half-pipe 310 can also be composed of polyimide mixed with heat-conducting insulating fillers, and the outer thermal insulation half-pipe 310 can also be composed of polyimide mixed with heat-conducting insulating fillers; in specific implementation, the outer thermal insulation half-pipe 310 can provide extremely high thermal stability and mechanical strength, especially providing additional protection under high-temperature or impact conditions, and further insulating heat and electrical interference.

[0055] Based on the above embodiments, as shown in Figure 3As shown, the shape of the thermal insulation sandwich pipe assembly 3 matches the shape of the insulating inner sleeve 2, that is, the inner thermal insulation pipe 30 and the outer thermal insulation pipe 31 of the thermal insulation sandwich pipe assembly 3 are both narrow-diameter pipes at one end and wide-diameter pipes at the other end, and the narrow-diameter pipe and the wide-diameter pipe are connected by a tapered pipe. In actual implementation, the thermal insulation sandwich pipe assembly 3 matches the shape of the insulating inner sleeve 2, which can enhance the structural stability of the entire stress cone.

[0056] Based on the above embodiment of the thermal insulation sandwich pipe assembly 3, as shown in Figure 6 In order to strengthen the structural strength of the thermal insulation sandwich pipe assembly 3, the thermal insulation sandwich pipe assembly 3 further includes a plurality of reinforcing strips 32, which are arranged between the inner thermal insulation pipe 30 and the outer thermal insulation pipe 31, and are fixedly connected to the inner wall of the outer thermal insulation pipe 31. In actual implementation, the reinforcing strips 32 can enhance the structural stability, such as preventing deformation and vibration of the thermal insulation sandwich pipe assembly 3, and can also optimize the mechanical properties, disperse the load of the inner and outer thermal insulation half-pipes 310, resist external physical impact, and ensure the normal working state of the thermal insulation sandwich pipe assembly 3 and its internal structure.

[0057] In this embodiment, in order to further enhance the structural stability of the thermal insulation sandwich pipe assembly 3, as shown in Figure 4 The vertical cross-sectional profile shape of the reinforcing strip 32 matches the vertical cross-sectional profile shape of the outer thermal insulation half-pipe 310, and the plurality of reinforcing strips 32 are arranged in a regular manner around the outer thermal insulation pipe 31. For example, the outer thermal insulation half-pipe 310 has a structure of a narrow-diameter pipe, a tapered pipe, and a wide-diameter pipe, and the reinforcing strip 32 includes a first vertical strip, an inclined strip, and a second vertical strip connected in sequence. The first vertical strip is arranged on the inner wall of the narrow-diameter pipe, the inclined strip is arranged on the inner wall of the tapered pipe, and the second vertical strip is arranged on the inner wall of the wide-diameter pipe. In actual implementation, the reinforcing strip 32 is arranged to match the profile of the outer thermal insulation pipe 31, which can effectively enhance the structural stability of the thermal insulation sandwich pipe assembly 3.

[0058] The number of reinforcing strips 32 is two, and the reinforcing strips 32 are arranged in a regular manner on both sides of the outer thermal insulation pipe 31 in the same vertical plane, that is, the reinforcing strips 32 are arranged in the middle of the outer thermal insulation half-pipe 310. Of course, other numbers and regular arrangement methods can also be selected by those skilled in the art, and are not limited herein.

[0059] In a specific embodiment, as shown in Figure 2As shown, further provided is an implementable structure of the insulating adhesive body 1, which comprises encapsulation glue and reinforcing glue for insulating and heat insulation; in the direction from the insulating inner sleeve 2 to the heat insulation sandwich pipe assembly 3, the insulating adhesive body 1 comprises, in sequence, an inner encapsulation glue layer 10, a reinforcing glue layer 11 and an outer encapsulation glue layer 12; the inner encapsulation glue layer 10 and the outer encapsulation glue layer 12 are both composed of encapsulation glue; the reinforcing glue layer 11 is composed of reinforcing glue; in a specific implementation, the inner encapsulation glue layer 10 and the outer encapsulation glue layer 12 can improve the connection firmness of the reinforcing glue layer 11, and the insulating adhesive body 1 composed of the inner encapsulation glue layer 10, the reinforcing glue layer 11 and the outer encapsulation glue layer 12 glues and connects two insulating inner half pipes 20, two inner heat insulation half pipes 300 and two outer heat insulation half pipes 310, reduces the kinetic energy of metal jet flow by using the multi-layer interval buffer mode, reduces the possibility of outward impact from the gap, reduces the impact on the protected equipment, and further optimizes the connection strength and insulating performance of the stress cone.

[0060] In an embodiment, the two insulating inner half pipes 20 are glued and connected by the inner encapsulation glue layer 10, the two inner heat insulation half pipes 300 are glued and connected by the reinforcing glue layer 11, and the two outer heat insulation half pipes 310 are glued and connected by the outer encapsulation glue layer 12.

[0061] In an embodiment, the two insulating inner half pipes 20 are glued and connected by the inner encapsulation glue layer 10 and the reinforcing glue layer 11, the two inner heat insulation half pipes 300 are glued and connected by the reinforcing glue layer 11, and the two outer heat insulation half pipes 310 are glued and connected by the outer encapsulation glue layer 12.

[0062] In an embodiment, the material of the reinforcing glue and the insulating inner sleeve 2 is the same type of material, that is, the material of the reinforcing glue and the insulating inner sleeve 2 can be the same type of silicone material or the same type of plastic material; in a specific implementation, the same type of material has better bonding effect and better sealing performance.

[0063] In the embodiment, the material components of the reinforcing glue include silicone rubber and fillers, the fillers include one or more of calcium carbonate, talcum powder, mica powder and glass fiber, and the fillers are mixed in the silicone rubber; specifically, the reinforcing glue is YD-45 special sealing glue for electric power; the material of the heat-resistant ceramicized silicone rubber is TCG-70 special silicone rubber material, that is, the reinforcing glue and the heat-resistant ceramicized silicone rubber are both silicone materials, and the bonding effect is enhanced after bonding of the two, thereby improving the sealing performance.

[0064] In an embodiment, as shown in Figure 1 the material components of the inner encapsulation glue layer 10 and the outer encapsulation glue layer 12 include epoxy resin, that is, the inner encapsulation glue layer 10 and the outer encapsulation glue layer 12 are both formed of epoxy resin.

[0065] In a specific embodiment, as shown in ​As shown, further provided is an achievable structure of the protective sleeve 4, which is sleeved on the outer side of the thermal insulation sandwich pipe assembly 3, and the protective sleeve 4 is shaped to match the shape of the insulating inner sleeve 2, that is, the protective sleeve 4 is a structure with a narrow-diameter pipe at one end and a wide-diameter pipe at the other end, and a tapered pipe connecting between the narrow-diameter pipe and the wide-diameter pipe. In specific implementation, the protective sleeve 4 is shaped to match the insulating inner sleeve 2 and the thermal insulation sandwich pipe assembly 3, thereby enhancing the structural stability of the entire stress cone.

[0066] In an embodiment, the protective sleeve 4 can be provided with different colors to facilitate work.

[0067] In summary, the present application adopts a multi-layer pipe structure, which includes the innermost insulating inner sleeve 2, the next inner inner thermal insulation pipe 30, the next outer outer thermal insulation pipe 31 and the outermost protective sleeve 4, and the design of clear division of labor and mutual cooperation provides excellent thermal stability and mechanical strength for the stress cone, avoids the breakdown problems of traditional stress cones such as concentrated stress cracking, electric breakdown, thermal breakdown and mechanical breakdown, and guides the fault arc to the ground through the setting of the arc pressure relief channel, thereby avoiding affecting other equipment.

[0068] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

[0069] Finally, it should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations.

Claims

1. A cable head stress cone characterized in that, The cable head stress cone formed by the insulation inner sleeve, the thermal insulation sandwich pipe assembly and the protective sleeve gradually reduces in diameter. The insulation adhesive body includes encapsulation glue and reinforcing glue for insulation and thermal insulation. The insulation adhesive body includes an inner encapsulation glue layer, a reinforcing glue layer and an outer encapsulation glue layer arranged in sequence from the insulation inner sleeve to the thermal insulation sandwich pipe assembly. The inner encapsulation glue layer and the outer encapsulation glue layer are both composed of the encapsulation glue. The reinforcing glue layer is composed of the reinforcing glue. The reinforcing glue and the material of the insulation inner sleeve are the same kind of material.

2. The cable head stress cone of claim 1, wherein, The material composition of the insulation inner sleeve includes heat-ceramized silicone rubber. The material composition of the reinforcing glue includes silicone rubber and fillers, and the fillers include one or more of calcium carbonate, talcum powder, mica powder and glass fiber. The thermal insulation sandwich pipe assembly includes at least two pairs of thermal insulation half pipes. One pair of the thermal insulation half pipes are inner thermal insulation half pipes, and the two inner thermal insulation half pipes are arranged oppositely to form an inner thermal insulation pipe, which is arranged outside the periphery of the insulation inner sleeve and is used to absorb heat from the inside.

3. The cable head stress cone of claim 2, wherein, One pair of the thermal insulation half pipes are outer thermal insulation half pipes, and the two outer thermal insulation half pipes are arranged oppositely to form an outer thermal insulation pipe, which is arranged outside the periphery of the inner thermal insulation pipe and is used to insulate heat from the outside.

4. The cable head stress cone of claim 3, wherein, A plurality of reinforcing strips are arranged between the inner thermal insulation pipe and the outer thermal insulation pipe, and the plurality of reinforcing strips are fixed to the inner wall of the outer thermal insulation pipe and are regularly arranged in the circumferential direction. The vertical cross-sectional profile shape of the reinforcing strip matches that of the outer thermal insulation half pipe, and the plurality of reinforcing strips are regularly arranged in the circumferential direction of the outer thermal insulation pipe.

5. The cable head stress cone of claim 1, wherein, The material composition of the inner thermal insulation half pipe includes one or more of cross-linked polyethylene and nano-modified polyethylene. The material composition of the outer thermal insulation half pipe includes polyimide mixed with heat-conducting insulating fillers. The insulation inner sleeve includes a narrow-diameter pipe segment, a tapered pipe segment and a wide-diameter pipe segment in sequence, and the narrow-diameter pipe segment and the wide-diameter pipe segment are connected through the tapered pipe segment.

6. The cable head stress cone of claim 5, wherein, The thermal insulation sandwich pipe assembly and the protective sleeve match the shape of the insulation inner sleeve.

7. The cable head stress cone of claim 6, wherein, ​ 8. The cable head stress cone of claim 6, wherein, ​ ​ 9. The cable head stress cone of claim 1, wherein, ​ 10. The cable head stress cone of claim 9, wherein, ​

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