Cable head stress cone

Abstract

The invention discloses a cable head stress cone which is used in the technical field of cable head protection equipment. The device comprises: an insulating adhesive body; the insulated inner sleeve comprises two insulated inner half tubes which are oppositely arranged, and the two insulated inner half tubes are connected in a sealing manner through an insulated bonding body; the heat insulation interlayer pipe assembly is arranged on the peripheral side of the insulation inner sleeve in a sleeving mode, 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 connected in a sealed mode through an insulation bonding body; and the protective sleeve is arranged outside the peripheral side of the heat insulation interlayer pipe assembly in a sleeving mode. When the insulating inner sleeve encounters high temperature, the insulating inner sleeve can be heated to be ceramized, and the condition of electric breakdown is prevented. The heat insulation interlayer pipe assembly can buffer internal thermal stress and can be matched with the insulation inner sleeve to reduce the gradient difference of internal temperature, and therefore the possibility of thermal breakdown is reduced. And the diameter of the stress cone part of the cable head formed by sleeving multiple pipes is gradually reduced so as to provide protection on an external mechanical structure.

Description

Technical Field

[0001] The invention relates to the technical field of cable head protection equipment, in particular to a cable head stress cone. Background Art

[0002] The cable joint is used to lock and fix the incoming and outgoing lines. When the cable is jointed, the original insulation layer of the cable will be damaged. Cold shrink tubes are now used to replace the original insulation layer. During the operation of the cable head at high temperature and high voltage, the stress cone of the cable head is prone to breakdown defects. In some existing technologies, an integral stress cone structure design is adopted. The structural design is too rigid and concentrated stress points appear under the action of circuit faults such as short circuit and flashover breakdown, resulting in concentrated stress cracking or falling off. Defects; in other existing technologies, when the stress cone encounters high temperature, it is easy to cause internal structure damage due to excessive temperature gradient, resulting in thermal breakdown; in some other existing technologies, the insulation performance will decrease in high temperature environment, resulting in electrical breakdown problems; in addition, unscientific production processes or inadequate skills of installers may cause the cable to suffer mechanical breakdown; the above defects will further induce local discharge or even breakdown failures, thereby damaging other electrical equipment and causing losses due to power cable joint failures. Summary of the invention

[0003] The invention provides a cable head stress cone, aiming 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 invention provides a cable head stress cone, comprising:

[0005] Insulation adhesive;

[0006] A heat-ceramicized insulating inner sleeve, the insulating inner sleeve comprising two relatively arranged insulating inner half-tubes, the two insulating inner half-tubes being sealed and connected by the insulating adhesive, and the material component of the insulating inner sleeve comprising any one of heat-ceramicized silicone rubber and heat-ceramicized polyolefin;

[0007] A heat-insulating sandwich pipe assembly, wherein the heat-insulating sandwich pipe assembly is sleeved on the outer peripheral side of the insulating inner sleeve, and the heat-insulating sandwich pipe assembly comprises at least one pair of oppositely arranged heat-insulating half-pipes, and the two heat-insulating half-pipes are sealed and connected by the insulating adhesive;

[0008] A protective sleeve, the protective sleeve being sleeved outside the circumference of the thermal insulation sandwich tube assembly;

[0009] The cable head stress cone formed by sequentially sleeve-connecting the insulating inner sleeve, the heat-insulating sandwich tube assembly and the protective sleeve has a gradually decreasing diameter of at least part thereof.

[0010] In one of the embodiments, the insulating adhesive body includes a packaging adhesive and a reinforcing adhesive for insulation and heat insulation;

[0011] Along the direction from the insulating inner sleeve to the heat-insulating sandwich tube assembly, the insulating adhesive body comprises an inner sealing rubber layer, a reinforcing rubber layer and an outer sealing rubber layer arranged in sequence;

[0012] The inner sealing glue layer and the outer sealing glue layer are both composed of the packaging glue;

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

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

[0015] In one embodiment, the material composition of the insulating inner sleeve includes heated ceramic silicone rubber;

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

[0017] In one of the embodiments, the thermally insulated sandwich tube assembly comprises at least two pairs of the thermally insulated half tubes;

[0018] A pair of the heat-insulating half-tubes are both inner heat-insulating half-tubes, and the two inner heat-insulating half-tubes are arranged opposite to each other to form an inner heat-insulating tube, and the inner heat-insulating tube is sleeved outside the circumference of the insulating inner sleeve, and the inner heat-insulating tube is used to absorb the heat inside;

[0019] A pair of the insulation half-tubes are both outer insulation half-tubes, and the two outer insulation half-tubes are arranged relative to each other to form an outer insulation tube. The outer insulation tube is sleeved outside the circumference of the inner insulation tube, and the outer insulation tube is used to isolate the external heat.

[0020] In one of the embodiments, a plurality of reinforcement strips are provided between the inner insulation tube and the outer insulation tube; the plurality of reinforcement strips are fixedly connected to the inner wall of the outer insulation tube, and the plurality of reinforcement strips are regularly arranged in the circumferential direction.

[0021] In one of the embodiments, the vertical cross-sectional profile shape of the reinforcement strip matches the vertical cross-sectional profile shape of the outer thermal insulation half pipe, and a plurality of the reinforcement strips are regularly arranged around the circumference of the outer thermal insulation pipe.

[0022] In one embodiment, the material composition of the inner insulation half pipe includes one or more of cross-linked polyethylene and nano-modified polyethylene;

[0023] The material composition of the outer heat-insulating half pipe includes one or more of polyimide and polyimide mixed with ceramic particles or heat-conductive insulating fillers.

[0024] In one of the embodiments, the insulating inner sleeve comprises a narrow diameter pipe section, a conical pipe section and a wide diameter pipe section in sequence; the narrow diameter pipe section and the wide diameter pipe section are connected via the conical pipe section.

[0025] In one of the embodiments, the thermal insulation sandwich tube assembly and the protective sleeve both match the shape of the insulating inner sleeve.

[0026] It can be seen from the above technical solutions that the present invention has the following advantages:

[0027] This embodiment provides a cable head stress cone. First, since the insulating inner sleeve and the heat-insulating sandwich tube assembly are both split-type half-tubes bonded together, they have higher flexibility and adaptability, avoiding the situation of concentrated stress cracking due to excessive rigidity; secondly, since the insulating inner sleeve has the characteristic of ceramicization when heated, it will harden into a ceramic state when high temperature occurs in the event of circuit faults such as short circuits and flashover breakdown, forming a good insulation barrier around the cable head, isolating the cable conductor from the external environment, that is, the ceramicized insulating inner sleeve can form a physical isolation for the arc, prevent electrical breakdown caused by insufficient insulation, and protect the joint and surrounding equipment from further damage. Prevent electrical breakdown; secondly, the ceramicization of the insulating inner sleeve can provide preliminary thermal insulation, and the insulating sandwich tube assembly can provide secondary thermal insulation. The insulating inner sleeve and the insulating sandwich tube assembly can reduce the internal temperature gradient difference to avoid thermal breakdown; finally, the protective sleeve physically protects the overall structure to resist external impact and environmental erosion. The diameter of the cable head stress cone formed by the multi-tube sleeve gradually becomes smaller to provide protection for the external mechanical structure. It can be seen that the cable head stress cone of this embodiment effectively solves the breakdown defect of the cable head stress cone in the prior art through the design of half-tube and multi-layer sleeve, and improves the insulation protection capability of the cable head. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 A schematic diagram of the overall structure of a cable head stress cone provided by an embodiment of the present invention;

[0030] Figure 2 A schematic structural diagram of a cable head stress cone (without the protective sleeve) provided in an embodiment of the present invention;

[0031] Figure 3 An exploded schematic diagram of a cable head stress cone (without the protective sleeve) provided in an embodiment of the present invention;

[0032] Figure 4 A schematic structural diagram of an insulating adhesive body of a cable head stress cone provided by an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of the cross-sectional structure of a cable head stress cone provided by an embodiment of the present invention;

[0034] Figure 6 A schematic structural diagram of a reinforcement strip of a cable head stress cone provided in an embodiment of the present invention.

[0035] Reference numerals:

[0036] 1. Insulating adhesive body; 10. Inner sealing glue layer; 11. Reinforced glue layer; 12. Outer sealing glue layer; 2. Insulating inner sleeve; 20. Insulating inner half pipe; 21. Narrow diameter pipe section; 22. Conical pipe section; 23. Wide diameter pipe section; 3. Insulating sandwich pipe assembly; 30. Inner insulation pipe; 300. Inner insulation half pipe; 31. Outer insulation pipe; 310. Outer insulation half pipe; 32. Reinforcement strip; 4. Protective sleeve. DETAILED DESCRIPTION

[0037] The embodiment of the present invention provides a cable head stress cone, which is used to solve the technical problem that the existing cable head stress cone is prone to breakdown defects.

[0038] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figures 1 to 6 The present invention provides a cable head stress cone, comprising:

[0040] Insulating adhesive 1;

[0041] The insulating inner sleeve 2 is heated and ceramicized, and the insulating inner sleeve 2 comprises two insulating inner half-tubes 20 arranged opposite to each other, and the two insulating inner half-tubes 20 are sealed and connected by an insulating adhesive 1, and the material component of the insulating inner sleeve 2 comprises any one of heated ceramicized silicone rubber and heated ceramicized polyolefin;

[0042] The heat-insulating sandwich pipe assembly 3 is sleeved on the outer peripheral side of the insulating inner sleeve 2, and the heat-insulating sandwich pipe assembly 3 includes at least one pair of oppositely arranged heat-insulating half-pipes, and the two heat-insulating half-pipes are sealed and connected by an insulating adhesive 1;

[0043] A protective sleeve 4, which is sleeved outside the circumference of the thermal insulation sandwich pipe assembly 3;

[0044] The cable head stress cone formed by sequentially sleeve-connecting the insulating inner sleeve 2, the heat-insulating interlayer tube assembly 3 and the protective sleeve 4 has a diameter that gradually decreases at least in part.

[0045] During the working process of this embodiment, after the cable head stress cone is sleeved on the cable head, when the cable head has a serious fault accompanied by high temperature such as short circuit, flashover breakdown, etc., when the insulating inner sleeve 2 encounters high temperature, the insulating inner sleeve 2 will be heated and ceramicized. The ceramicized insulating inner sleeve 2 can form a physical isolation for the arc, protect the joint and surrounding equipment from further damage by the arc, and prevent the occurrence of electrical breakdown; the thermal insulation sandwich tube assembly 3 can buffer the internal thermal stress, and cooperate with the insulating inner sleeve 2 to reduce the internal temperature gradient difference, thereby reducing the possibility of thermal breakdown; the protective sleeve 4 plays a supporting function to provide protection for the external mechanical structure, and the diameter of the cable head stress cone part formed by the multi-tube sleeve gradually decreases to provide protection for the external mechanical structure, avoiding external force interference to damage the cable head and the internal structure of the cable head stress cone.

[0046] Compared with the prior art, the present embodiment has the following advantages: first, it is not easy to crack due to concentrated stress. The cable head stress cone of the present embodiment adopts a split half-tube structure design. The two half-tubes are bonded by an insulating adhesive 1. The insulating adhesive 1 can undergo a certain degree of deformation, which plays a role in buffering external forces, so that the stress cone as a whole can better adapt to changes in external forces, showing higher flexibility. It has higher flexibility and adaptability, can reduce stress concentration, and improve the durability and reliability of the overall structure, thereby optimizing the balance between protection performance and service life, and avoiding the technology of using a complete tube as in the prior art, which has poor flexibility and adaptability, and is prone to concentrated stress points under external impact or stress due to excessive overall rigidity, increasing the risk of damage; second, it is not easy to have electrical breakdown. The insulating inner sleeve 2 of the present embodiment that abuts and fits the cable head has the characteristic of being ceramicized when heated, and the electrical When a short circuit, flashover breakdown or other serious faults accompanied by high temperature occur at the cable head, the insulating inner sleeve 2 will be ceramicized and still maintain good insulation performance to prevent the occurrence of electrical breakdown; third, thermal breakdown is not easy to occur. The insulating inner sleeve 2 of this embodiment can perform preliminary thermal insulation, and the insulating sandwich tube assembly 3 performs secondary thermal insulation. The cooperation of the insulating inner sleeve 2 and the insulating sandwich tube assembly 3 can reduce the internal temperature gradient difference, avoiding the situation in which the prior art has only a single insulation layer and the temperature gradient is too large and thermal breakdown occurs; fourth, it is not easy to be damaged when disturbed by external forces. The protective sleeve 4 of the outermost layer of the stress cone of the cable head of this embodiment can physically protect the overall structure and resist external impact and environmental erosion; fifth, it is easy to install. The semi-tube structure of this embodiment is combined with the semi-tube design, and the installation process is more flexible. The installation method or installation process can be flexibly adjusted, which is convenient for installation and maintenance.

[0047] It can be seen that the stress cone of this embodiment can reduce the breakdown problems of traditional stress cones such as concentrated stress cracking, electrical breakdown, thermal breakdown and mechanical breakdown through the three-layer casing structure. The protection performance of the cable head stress cone is effectively optimized through the three-layer tube body, and the anti-breakdown effect is good. It can still maintain structural integrity and mechanical strength in high temperature and high voltage environment, and significantly reduce the risk of equipment damage and power system interruption.

[0048] In a specific embodiment, Figure 3 and Figure 5 As shown, a feasible structure of an insulating inner sleeve 2 is further provided. The insulating inner sleeve 2 formed by two insulating inner half-tubes 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 to the wide diameter pipe section 23 through the conical pipe section 22. During specific implementation, the narrow diameter pipe section 21 serves as the crimping position of the cable head, and the wide diameter pipe section 23 serves as the arc pressure relief channel of the arc. When a short circuit or flashover breakdown occurs in the cable head, the arc will be ejected to the ground through the arc pressure relief channel without affecting the nearby electrical equipment, thereby reducing equipment losses; and the structure of the conical pipe section 22 with a small top and a large bottom can enhance the structural strength of the stress cone of the entire cable head.

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

[0050] In one embodiment, the material component of the insulating inner sleeve 2 is heated ceramic 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 for the arc. The ceramicized insulating inner sleeve 2 has the following two advantages. First, the material hardens into a ceramic state at high temperature (650°C to 3000°C), which can provide additional mechanical strength and thermal protection, thereby forming physical isolation when a high-temperature arc is triggered by a cable fault, protecting the sleeve of the joint and stress cone or surrounding equipment from further damage; second, this material has excellent sealing and insulation properties, can maintain the stability of the connection for a long time at normal temperature, and provide reliable secondary protection under extreme conditions, significantly improving the overall safety and reliability of the system.

[0051] In this embodiment, the heated ceramic silicone rubber will harden into a ceramic state at 650°C ~ 3000°C. Specifically, the material of the heated ceramic silicone rubber is TCG-70 special silicone rubber material. During implementation, when a short-circuit arc or a flashover arc occurs at the cable head, the accompanying temperature is between 2000°C and 3000°C, and the ceramic triggering temperature of the heated ceramic silicone rubber is between 650°C and 3000°C, covering the common temperatures of short-circuit arcs and flashover arcs, ensuring daily use.

[0052] In a specific embodiment, Figure 2 and Figure 3 As shown, a feasible structure of an insulated sandwich pipe assembly 3 is further provided, and the insulated sandwich pipe assembly 3 includes at least two pairs of insulated half-tubes; one pair of insulated half-tubes are both inner insulated half-tubes 300, the two inner insulated half-tubes 300 are arranged relatively and bonded by an insulating adhesive 1 to form an inner insulated pipe 30, the inner insulated pipe 30 is sleeved on the outer side of the insulating inner sleeve 2, and the inner insulated pipe 30 is used to absorb the inner heat; one pair of insulated half-tubes are both outer insulated half-tubes 310, the two outer insulated half-tubes 310 are arranged relatively and bonded by an insulating adhesive 1 to form an outer insulated pipe Tube 31, the outer insulation tube 31 is sleeved on the outer side of the inner insulation tube 30, and the outer insulation tube 31 is used to isolate the external heat. In specific implementation, the insulating inner sleeve 2 is used as the first insulation layer, the inner insulation layer is used as the second insulation layer, and the outer insulation layer is used as the third insulation layer. The three insulation layers can increase the effect of gradient insulation. The multi-layer division of labor significantly reduces the influence of thermal gradient and impact force conduction, so that the entire sheath has higher durability and protection performance under harsh conditions, avoiding thermal breakdown damage caused by excessive temperature gradient due to only a single insulation layer like the traditional stress cone.

[0053] In one embodiment, if Figure 2 and Figure 3 As shown, the material composition of the inner insulation half tube 300 includes one or more of cross-linked polyethylene and nano-modified polyethylene. For example, the inner insulation half tube 300 can be composed of cross-linked polyethylene, the inner insulation half tube 300 can also be composed of nano-modified polyethylene (nano-enhanced polyethylene), and the inner insulation half tube 300 can also be composed of a composite of cross-linked polyethylene and nano-modified polyethylene. In specific implementation, the inner insulation half tube 300 can maintain stable performance in a high temperature environment, while providing additional support for subsequent sleeves, effectively enhancing thermal stability and electrical performance.

[0054] In one embodiment, if Figure 2 and Figure 3 As shown, the material composition of the outer thermal insulation half tube 310 includes one or more of polyimide and polyimide mixed with ceramic particles or thermally conductive insulating fillers. For example, the outer thermal insulation half tube 310 can be composed of polyimide, the outer thermal insulation half tube 310 can also be composed of polyimide mixed with ceramic particles, the outer thermal insulation half tube 310 can also be composed of polyimide mixed with thermally conductive insulating fillers, and the outer thermal insulation half tube 310 can also be composed of polyimide mixed with thermally conductive insulating fillers. In specific implementation, the outer thermal insulation half tube 310 can provide extremely high thermal stability and mechanical strength, especially provide additional protection under high temperature or impact conditions, and play a role in further isolating heat and electrical interference.

[0055] Based on the above embodiments, Figure 3As shown, the shape of the thermal insulation sandwich tube assembly 3 matches the shape of the insulating inner sleeve 2, that is, the inner insulation tube 30 and the outer insulation tube 31 of the thermal insulation sandwich tube assembly 3 are both narrow-diameter tubes at one end and wide-diameter tubes at the other end, and the narrow-diameter tube and the wide-diameter tube are connected by a conical tube. In specific implementation, the thermal insulation sandwich tube 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-mentioned embodiment of the thermal insulation sandwich pipe assembly 3, as Figure 3 As shown, in order to enhance the structural strength of the thermal insulation sandwich tube assembly 3, the thermal insulation sandwich tube assembly 3 also includes a plurality of reinforcing strips 32, and the plurality of reinforcing strips 32 are arranged between the inner insulation tube 30 and the outer insulation tube 31, and the plurality of reinforcing strips 32 are fixedly connected to the inner wall of the outer insulation tube 31. In specific implementation, the reinforcing strips 32 can enhance the structural stability, such as preventing the thermal insulation sandwich tube assembly 3 from deformation and vibration, and at the same time can optimize the mechanical properties, disperse the loads of the inner and outer insulation half-tubes 310, resist external physical impact, and ensure the normal working state of the thermal insulation sandwich tube 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 FIG. Figure 6 As shown, the vertical cross-sectional profile shape of the reinforcing strip 32 matches the vertical cross-sectional profile shape of the outer insulation half-tube 310, and multiple reinforcing strips 32 are regularly arranged around the outer insulation tube 31. For example, the outer insulation half-tube 310 is a structure of a narrow diameter tube, a conical tube and a wide diameter tube. The reinforcing strip 32 includes a first vertical strip, an oblique strip and a second vertical strip connected in sequence. The first vertical strip is arranged on the inner wall of the narrow diameter tube, the oblique strip is arranged on the inner wall of the conical tube, and the second vertical strip is arranged on the inner wall of the wide diameter tube. In specific implementation, the configuration of matching the profile of the reinforcing strip 32 with the outer insulation tube 31 can effectively enhance the structural stability of the insulation sandwich tube assembly 3.

[0058] Among them, the number of reinforcement strips 32 is two, and the regular arrangement of the reinforcement strips 32 is: on the same vertical plane, the two reinforcement strips 32 are relatively arranged on both sides of the outer insulation tube 31, that is, the reinforcement strip 32 is arranged in the middle of the outer insulation half tube 310. Of course, other numbers and regular arrangements can also be selected by technical personnel in this field, and no excessive restrictions are made here.

[0059] In a specific embodiment, Figure 4As shown, an achievable structure of an insulating adhesive body 1 is further provided, the insulating adhesive body 1 includes a packaging glue and a reinforcing glue for insulation and heat insulation; along the direction from the insulating inner sleeve 2 to the insulating sandwich tube assembly 3, the insulating adhesive body 1 includes an inner sealing glue layer 10, a reinforcing glue layer 11 and an outer sealing glue layer 12 arranged in sequence; the inner sealing glue layer 10 and the outer sealing glue layer 12 are both composed of packaging glue; the reinforcing glue layer 11 is composed of reinforcing glue, in specific implementation, the inner sealing glue layer 10 and the outer sealing glue layer 12 can improve the connection firmness of the reinforcing glue layer 11, and the insulating adhesive body 1 composed of the inner sealing glue layer 10, the reinforcing glue layer 11 and the outer sealing glue layer 12 glues the two insulating inner half-tubes 20 together, the two inner heat-insulating half-tubes 300 together, and the two outer heat-insulating half-tubes 310 together, the insulating adhesive body 1 adopts a multi-layer spacing buffering method to reduce the kinetic energy of the metal jet, reduce the possibility of outward impact from the gap, reduce the impact on the protected equipment, and further optimize the connection strength and insulation performance of the stress cone.

[0060] In one embodiment, the two insulating inner half pipes 20 are bonded together by an inner sealing layer 10 , the two inner heat insulating half pipes 300 are bonded together by a reinforcing adhesive layer 11 , and the two outer heat insulating half pipes 310 are bonded together by an outer sealing layer 12 .

[0061] In one embodiment, the two insulating inner half pipes 20 are bonded together by an inner sealing layer 10 and a reinforcing layer 11 , the two inner heat insulating half pipes 300 are bonded together by a reinforcing layer 11 , and the two outer heat insulating half pipes 310 are bonded together by an outer sealing layer 12 .

[0062] In one embodiment, the materials of the reinforcing glue and the insulating inner sleeve 2 are the same material, that is, the materials of the reinforcing glue and the insulating inner sleeve 2 can be the same silicone material or the same plastic material. In specific implementation, the bonding effect of the same material will be better and the sealing performance will be better.

[0063] In this embodiment, the material components of the reinforcing glue include silicone rubber and fillers, and the fillers include one or more of calcium carbonate, talcum powder, mica powder, and glass fiber. The fillers are mixed in the silicone rubber. Specifically, the reinforcing glue is YD-45 special electric power sealant; the material of the heated ceramic silicone rubber is TCG-70 special silicone rubber material, that is, the reinforcing glue and the heated ceramic silicone rubber are both silicone materials. After the two are bonded, the bonding effect can be enhanced, thereby improving the sealing performance.

[0064] In one embodiment, if Figure 2 As shown, the material components of the inner sealing layer 10 and the outer sealing layer 12 include epoxy resin, that is, the inner sealing layer 10 and the outer sealing layer 12 are both formed of epoxy resin.

[0065] In a specific embodiment, Figure 1As shown, a feasible structure of a protective sleeve 4 is further provided, and the protective sleeve 4 is sleeved on the outside of the thermal insulation sandwich tube assembly 3, and the shape of the protective sleeve 4 matches the shape of the insulating inner sleeve 2, that is, the protective sleeve 4 is a narrow diameter tube at one end and a wide diameter tube at the other end, and the narrow diameter tube and the wide diameter tube are connected by a conical tube. During specific implementation, the protective sleeve 4 matches the shape of the insulating inner sleeve 2 and the thermal insulation sandwich tube assembly 3, which can enhance the structural stability of the entire stress cone.

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

[0067] In summary, the present solution adopts a multi-layer pipe body structure, including the innermost insulating inner sleeve 2, the second innermost inner insulation tube 30, the second outermost outer insulation tube 31 and the outermost protective sleeve 4. The design with clear division of labor and mutual coordination provides excellent thermal stability and mechanical strength for the stress cone, avoiding the breakdown problems of traditional stress cones such as concentrated stress cracking, electrical breakdown, thermal breakdown and mechanical breakdown, and through the setting of the arc pressure relief channel, the fault arc is guided to the ground to avoid affecting other equipment.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

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

Claims

1. A cable head stress cone, characterized in that: include: Insulation adhesive; A heat-ceramicized insulating inner sleeve, the insulating inner sleeve comprising two relatively arranged insulating inner half-tubes, the two insulating inner half-tubes being sealed and connected by the insulating adhesive, and the material component of the insulating inner sleeve comprising any one of heat-ceramicized silicone rubber and heat-ceramicized polyolefin; A heat-insulating sandwich pipe assembly, wherein the heat-insulating sandwich pipe assembly is sleeved on the outer peripheral side of the insulating inner sleeve, and the heat-insulating sandwich pipe assembly comprises at least one pair of oppositely arranged heat-insulating half-pipes, and the two heat-insulating half-pipes are sealed and connected by the insulating adhesive; A protective sleeve, the protective sleeve being sleeved outside the circumference of the thermal insulation sandwich tube assembly; The cable head stress cone formed by sequentially sleeve-connecting the insulating inner sleeve, the heat-insulating sandwich tube assembly and the protective sleeve has a gradually decreasing diameter of at least part thereof.

2. The cable head stress cone according to claim 1, characterized in that: The insulating adhesive body includes packaging adhesive and reinforcing adhesive for insulation and heat insulation; Along the direction from the insulating inner sleeve to the heat-insulating sandwich tube assembly, the insulating adhesive body comprises an inner sealing rubber layer, a reinforcing rubber layer and an outer sealing rubber layer arranged in sequence; The inner sealing glue layer and the outer sealing glue layer are both composed of the packaging glue; The reinforcing adhesive layer is composed of the reinforcing adhesive.

3. The cable head stress cone according to claim 2, characterized in that: The reinforcing glue and the insulating inner sleeve are made of the same material.

4. The cable head stress cone according to claim 3, characterized in that: The material components of the insulating inner sleeve include heated ceramic silicone rubber; The material components of the reinforcing rubber include silicone rubber and fillers, and the fillers include one or more of calcium carbonate, talcum powder, mica powder, and glass fiber.

5. The cable head stress cone according to claim 1, characterized in that: The thermally insulated sandwich tube assembly comprises at least two pairs of the thermally insulated half tubes; A pair of the heat-insulating half-tubes are both inner heat-insulating half-tubes, and the two inner heat-insulating half-tubes are arranged opposite to each other to form an inner heat-insulating tube, and the inner heat-insulating tube is sleeved outside the circumference of the insulating inner sleeve, and the inner heat-insulating tube is used to absorb the heat inside; A pair of the insulation half-tubes are both outer insulation half-tubes, and the two outer insulation half-tubes are arranged relative to each other to form an outer insulation tube. The outer insulation tube is sleeved outside the circumference of the inner insulation tube, and the outer insulation tube is used to isolate the external heat.

6. The cable head stress cone according to claim 5, characterized in that: A plurality of reinforcing strips are provided between the inner insulation tube and the outer insulation tube; the plurality of reinforcing strips are fixedly connected to the inner wall of the outer insulation tube, and the plurality of reinforcing strips are regularly arranged in the circumferential direction.

7. The cable head stress cone according to claim 6, characterized in that: The vertical cross-sectional profile shape of the reinforcement strip matches the vertical cross-sectional profile shape of the outer thermal insulation half pipe, and a plurality of the reinforcement strips are regularly arranged around the circumference of the outer thermal insulation pipe.

8. The cable head stress cone according to claim 6, characterized in that: The material composition of the inner heat-insulating half-tube includes one or more of cross-linked polyethylene and nano-modified polyethylene; The material composition of the outer heat-insulating half pipe includes one or more of polyimide and polyimide mixed with ceramic particles or heat-conductive insulating fillers.

9. The cable head stress cone according to claim 1, characterized in that: The insulating inner sleeve comprises a narrow-diameter pipe section, a conical pipe section and a wide-diameter pipe section in sequence; the narrow-diameter pipe section and the wide-diameter pipe section are connected via the conical pipe section.

10. The cable head stress cone according to claim 9, characterized in that: The heat-insulating sandwich tube assembly and the protective sleeve both match the shape of the insulating inner sleeve.

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