Prefabricated fusion stress cone

Abstract

The utility model relates to a high-voltage power cable connection accessory, and discloses a prefabricated fusion stress cone which can be prefabricated in advance, can be crosslinked with a cable to form a whole, effectively eliminates a micro air gap between the stress cone and a cable insulation layer, prevents polarization, and effectively improves the electrical performance stability and power transmission safety of the cable during power transmission. The utility model comprises the following components. The stress cone comprises a stress cone insulator and a stress control body, two ends of the stress cone insulator respectively extend outwards along the axis direction of the stress cone insulator, and the stress cone insulator is used for sleeving a cable; the stress control body is sleeved on the outer wall of the stress cone insulator, and the stress control body and the stress cone insulator are fused, grafted and crosslinked to form an integrated fusion welding structure.

Description

Technical Field

[0001] The utility model relates to a connecting accessory for high-voltage power cables, in particular to a prefabricated fused stress cone. Background Art

[0002] A high-voltage power cable is a power device used for high-voltage electric energy transmission, and is mostly applied to long-distance and large-length power transmission and distribution. In the actual application of high-voltage cables, the electric field is concentrated at the cable terminal position. The uniform distribution of this electric field and the realization of stable electrical performance are completed by the cable terminal stress cone. Therefore, an accessory - a cable terminal plug-and-play connector is required at the high-voltage cable terminal, which can make the electric field constant, dispersed and homogenized, so that the concentrated field strength can be restored to the normal electrical operation state.

[0003] In the existing cable plug-and-play connector structure, during the long-term operation of the cable, the high-field sensitive area between the stress cone insulation and the cable insulation is a movable interface. This interface is affected by the dual action of the electric field and the thermal field. This action causes polarization of the tiny air gaps between the stress cone and the cable inside the connector, as well as trace moisture and impurities on the interface. The polarization effect will cause distortion of the interface electric field between the stress cone and the cable insulation layer in the high electric field strength area, thereby increasing the risk of surface discharge and causing the insulation layer to be broken down. Moreover, the cable terminal plug-and-play connector needs to be prefabricated in advance, which should be convenient for transportation and storage, and can be directly and quickly fused with the high-voltage cable terminal on-site to completely eliminate the electrical hidden dangers of the micro-air gap interface. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a prefabricated fused stress cone, which can be prefabricated in advance, can be cross-linked with the cable to form an integral body, and can effectively eliminate the micro-air gap between the stress cone and the cable insulation layer and prevent polarization, effectively improving the electrical performance stability and power transmission safety during cable power transmission.

[0005] The prefabricated fused stress cone according to an embodiment of the utility model includes:

[0006] A stress cone insulator, both ends of which extend outward along the axis direction of the stress cone insulator, and the stress cone insulator is used for sleeving the cable;

[0007] A stress control body, which is sleeved on the outer wall of the stress cone insulator, and the stress control body and the stress cone insulator are in a melt graft cross-linking combination to form an integral welding structure.

[0008] According to some embodiments of the utility model, the stress cone insulator

[0009] It includes a stress cone connection part in a conical shape, a first cylindrical part, and a second cylindrical part. The longest diameter of the cross-section of the first cylindrical part is the first diameter. The wider end of the first cylindrical part is connected to the wider end of the stress cone connection part. The longest diameter of the cross-section of the second cylindrical part is the second diameter, and the second diameter is smaller than the first diameter. One end of the second cylindrical part is connected to the narrower end of the stress cone connection part. The stress cone connection part penetrates through the stress control body, and the stress cone connection part and the stress control body are in a melt graft crosslinking combination to form an integral welded structure.

[0010] According to some embodiments of the present invention, the stress cone connection part, the first cylindrical part, and the second cylindrical part are an integrally formed structure. The inner wall opening diameters of the stress cone connection part, the first cylindrical part, and the second cylindrical part are the same, and a connection hole is formed through the stress cone insulator. The connection hole is used for sleeving the cable.

[0011] According to some embodiments of the present invention, the stress cone connection part is a first stress cone connection part, and the first stress cone connection part penetrates through the stress control body;

[0012] The first cylindrical part is a first cylindrical barrel part, and one end of the first cylindrical barrel part is connected to the wider end of the first stress cone connection part;

[0013] The second cylindrical part is a second cylindrical barrel part, and one end of the second cylindrical barrel part is connected to the narrower end of the first stress cone connection part and the connection part is a continuous transition.

[0014] According to some embodiments of the present invention, a first ring flange is provided at the connection part between the first cylindrical barrel part and the first stress cone connection part, and the inner wall surface of the first ring flange is melt-connected to the surface of the stress control body.

[0015] According to some embodiments of the present invention, the first cylindrical barrel part, the first stress cone connection part, and the second cylindrical barrel part are an integrally formed structure. The inner wall opening diameters of the first cylindrical barrel part, the first stress cone connection part, and the second cylindrical barrel part are the same, and a connection hole is formed through the stress cone insulator. The connection hole is used for sleeving the cable.

[0016] According to some embodiments of the present invention, the stress cone connection part is a second stress cone connection part;

[0017] The first cylindrical part is a conical barrel part, and the wider end of the conical barrel part is connected to the wider end of the second stress cone connection part;

[0018] The second cylindrical body part is a third cylindrical body part, and one end of the third cylindrical body part is connected to the narrower end of the second stress cone connection part, and the connection part is a continuous transition.

[0019] According to some embodiments of the present invention, a second annular flange is provided at the connection part between the conical cylindrical body part and the second stress cone connection part, and the inner wall surface of the second annular flange is melt-connected to the surface of the stress control body.

[0020] According to some embodiments of the present invention, the conical cylindrical body part, the second stress cone connection part, and the third cylindrical body part are of an integrally formed structure. The inner wall opening diameters of the conical cylindrical body part, the second stress cone connection part, and the third cylindrical body part are the same and form a connection hole penetrating through the stress cone insulator. The connection hole is used for sleeving the cable.

[0021] According to some embodiments of the present invention, the stress cone insulator is made of non-crosslinked polyethylene material.

[0022] According to some embodiments of the present invention, the stress control body gradually widens from the first end to the second end. A wide opening is formed at the second end of the stress control body. The first end of the stress control body gradually narrows along the axial direction of the stress control body to form a relatively small end.

[0023] According to some embodiments of the present invention, the stress control body is in a conical shape.

[0024] According to some embodiments of the present invention, the wider end of the stress control body is provided as a third annular flange, so that the end of the stress control body extends radially outward.

[0025] The embodiments of the present invention have at least the following beneficial effects: Since the stress control body satisfies the stress curve, installing the stress control body on the stress cone insulator can avoid the occurrence of electric field breakdown, effectively improving the safety and reliability of cable power transmission; the stress cone insulator and the stress control body are melt-grafted and crosslinked to form an integrally welded structure, and the stress cone insulator can also be melt-grafted and crosslinked with the insulating layer of the cable to form an integrally welded structure, which can effectively avoid the existence of micro-air gaps or separation between the stress control body and the stress cone insulator or between the cable and the stress cone insulator; in addition, prefabricating the fused stress cone in advance not only simplifies the steps and difficulties of on-site welding installation, but also facilitates transportation and storage. The fused stress cones required can be stored in advance at the power transmission site, which is convenient for replacement and on-site welding installation at any time, effectively improving the convenience and reliability.

[0026] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Brief Description of the Drawings

[0027] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 is a schematic structural view of a prefabricated fusion stress cone according to the first embodiment of the present utility model;

[0029] Figure 2 is Figure 1 a sectional view showing the structure;

[0030] Figure 3 is Figure 1 an exploded schematic view showing the structure;

[0031] Figure 4 is Figure 3 a sectional view showing the structure;

[0032] Figure 5 is Figure 3 a plane sectional view showing the structure;

[0033] Figure 6 is Figure 3 a sectional view showing the structure from another angle;

[0034] Figure 7 is a schematic structural view of a cable installed by applying the embodiment of the present utility model;

[0035] Figure 8 is a schematic view of the state after the fusion stress cone of the embodiment of the present utility model is installed on the cable;

[0036] Figure 9 is a schematic view for comparing the structures of four different fusion stress cones of the embodiment of the present utility model;

[0037] Figure 10 is Figure 9 a plane sectional view showing the structure;

[0038] Figure 11 is Figure 9 a schematic view for comparing the structures of four different stress cone control bodies of the structure;

[0039] Figure 12 is Figure 11 a plane sectional view showing the structure;

[0040] Figure 13 is a schematic structural view of a prefabricated fusion stress cone according to the second embodiment of the present utility model;

[0041] Figure 14 is Figure 13 a plan sectional view showing the structure;

[0042] Figure 15 is Figure 14 an exploded schematic view showing the structure;

[0043] Figure 16 is Figure 13 an exploded schematic view showing the structure;

[0044] Figure 17 Schematic diagram of the structure of the prefabricated fusion stress cone according to the third embodiment of the present utility model;

[0045] Figure 18 is Figure 13 an exploded schematic view showing the structure;

[0046] Figure 19 is Figure 13 an exploded schematic view showing the structure from another angle;

[0047] Figure 20 is Figure 13 a plan sectional view showing the structure;

[0048] Figure 21 is Figure 20 an exploded schematic view showing the structure.

[0049] Reference numerals:

[0050] Label Name Label Name 1000 Fusion stress cone 1160 Second stress cone connection part 1100 Stress cone insulator 1170 Third cylindrical barrel part 1110 First cylindrical barrel part 1200 Stress control body 1111 First ring flange 1210 Third ring flange 1120 First stress cone connection part 2000 Cable 1130 Second cylindrical barrel part 2100 Conductor 1140 Connection hole 2200 Insulation layer 1150 Conical barrel part 2300 Insulation shielding layer 1151 Second ring flange Detailed implementation manners

[0051] The concept, specific structure and technical effects of the present utility model will be clearly and completely described below in conjunction with the embodiments and the drawings, so as to fully understand the purpose, scheme and effects of the present utility model. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0052] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. In addition, the up, down, left, right, top, bottom, etc. used in the present utility model are only relative to the mutual positional relationship of the components of the present utility model in the drawings.

[0053] In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this technology belongs. The terms used in the description of this specification are only for describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any combination of one or more of the related listed items.

[0054] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, without departing from the scope of this disclosure, the first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0055] In a first aspect, referring to Figures 1 to 6 、or Figures 9 to 12 、or Figures 13 to 16 、or Figures 17 to 21 , a prefabricated fusion stress cone according to an embodiment of the present utility model for connecting a cable 2000 includes a stress cone insulator 1100 and a stress control body 1200; both ends of the stress cone insulator 1100 extend outward along the axis direction of the stress cone insulator 1100, and the stress cone insulator 1100 is used for sleeving the cable 2000; the stress control body 1200 is sleeved on the outer wall of the stress cone insulator 1100, and the stress control body 1200 and the stress cone insulator 1100 are in a melt graft crosslinking combination to form an integral welded structure.

[0056] In some embodiments of the present utility model, the stress cone insulator 1100 includes a stress cone connection portion, a first cylindrical portion, and a second cylindrical portion in a conical shape. The longest cross-sectional diameter of the first cylindrical portion is the first diameter. The wider end of the first cylindrical portion is connected to the wider end of the stress cone connection portion. The longest cross-sectional diameter of the second cylindrical portion is the second diameter, and the second diameter is smaller than the first diameter. One end of the second cylindrical portion is connected to the narrower end of the stress cone connection portion. The stress cone connection portion passes through the stress control body 1200, and the stress cone connection portion and the stress control body 1200 are in a melt graft crosslinking combination to form an integral welded structure.

[0057] In some embodiments of the present utility model, the stress cone connection portion, the first cylindrical portion, and the second cylindrical portion are an integrally formed structure. The inner wall opening diameters of the stress cone connection portion, the first cylindrical portion, and the second cylindrical portion are the same, and a connection hole 1140 penetrating the stress cone insulator 1100 is formed. The connection hole 1140 is used for sleeving the cable 2000.

[0058] In some embodiments of the present utility model, the stress control body 1200 is in a conical shape. The wider end of the stress control body 1200 is provided with a third ring flange 1210, so that the end of the stress control body 1200 extends radially outward.

[0059] It can be known that the stress control body 1200 is made of a semiconductive material. Those skilled in the art can determine the stress curve parameters of the stress control body 1200 according to the requirements of the actual power transmission parameters of the cable 2000, and then can determine the shape of the inner cavity of the mold so that the design of the shape of the stress control body 1200 meets the requirements.

[0060] It can be known that the shape of the stress cone insulator 1100 can also be designed accordingly according to the design requirements for the shape of the model in the first composite mold, so that the shape of the fused stress cone 1000 meets the requirements. That is, the stress cone insulator 1100 and the stress control body 1200 are arranged according to the electrical stress structure. The electrical stress is evenly distributed according to the stress cone and maintained at a certain pressure level, which can ensure the working stability of the cable 2000 terminal. And after the stress control body 1200 and the stress cone insulator 1100 are melt grafted and crosslinked and combined, the surfaces of the stress cone insulator 1100 and the stress control body 1200 in contact with each other are tightly attached, and the two are compound crosslinked. That is, the stress control body 1200 and the stress cone insulator 1100 are like an integrally formed structure and will be firmly connected together. It also improves the stability and reliability of the two, ensuring that under long-term high temperature and high pressure, the two will not separate or have air gaps, effectively improving safety.

[0061] It can be known that the insulating layer 2200 of the cable 2000 is made of crosslinked polyethylene material. However, when two objects made of the same crosslinked polyethylene material attempt to be connected by melting, it is very difficult to achieve true fusion between them. This is because after melting and connection, there is often an obvious and non-fused interface between the two. This kind of microscopic air gap is the hidden danger that leads to electric field distortion and promotes the generation of electrical trees, and further leads to the risk of breakdown accidents during the operation of the cable terminal.

[0062] In addition, in the present utility model, the stress cone insulator 1100 is made of non-crosslinked polyethylene material. The characteristics of this material enable it to be tightly combined with the main body of the insulating layer 2200 of the cable 2000 by means of welding. Specifically, the stress cone insulator 1100 can be crosslinked and combined with the insulating layer 2200 of the cable 2000 by means of melt grafting to form a seamless integral fusion structure. This combination method enables the fusion interface between the two different materials to reach a grafting combination state without air gaps and interfaces, thereby ensuring that the stress cone insulator 1100 and the insulating layer 2200 of the cable 2000 can be completely fused to form a unified whole.

[0063] This fusion not only greatly improves the anti-puncture strength, but also forms an integrated structure with thermosetting properties due to the combination of non-crosslinked polyethylene and crosslinked polyethylene, that is, it has an irreversible three-dimensional network structure. This means that once the two are combined, they cannot be separated by simple physical methods (such as heating or dissolving). In addition, this integrated structure also exhibits better high-temperature resistance, enabling the cable 2000 and the fusion stress cone 1000 to maintain long-term stable operation when the operating temperature of the cable conductor is at 115 °C, thus significantly enhancing the stability and safety of the cable during power transmission.

[0064] Taking the fusion stress cone 1000 as the plug-in connector of the cable terminal of the cable 2000, its overall performance has been significantly improved, providing a strong guarantee for the reliability and efficiency of power transmission.

[0065] According to the manufacturing process of the prefabricated fusion stress cone of the present utility model, it includes the following steps:

[0066] Manufacture the stress control body 1200, and manufacture the stress control body 1200 in a conical shape;

[0067] Manufacture the fusion stress cone 1000, place the stress control body 1200 in the first composite mold, and inject non-crosslinked polyethylene raw material into the first composite mold. The non-crosslinked polyethylene raw material passes through the stress control body 1200, and through heating and extrusion, the non-crosslinked polyethylene raw material forms the stress cone insulator 1100. After cooling, the stress control body 1200 is sleeved on the outer wall of the stress cone insulator 1100, and the stress control body 1200 and the stress cone insulator 1100 are melt-grafted and crosslinked to form an integrated welded structure of the fusion stress cone 1000.

[0068] In some embodiments of the present utility model, the step of manufacturing the stress control body 1200 specifically includes:

[0069] Start the first extruder filled with semi-conductive raw material, preheat the first extruder at 100 °C to 190 °C, and the preheating duration is 30 minutes to 50 minutes;

[0070] Start the stress control body mold with the mold closed and locked, heat it to 120 °C to 190 °C, and maintain it for 35 minutes to 45 minutes;

[0071] Start the first extruder, and make the first extruder inject the molten semi-conductive raw material into the stress control body mold;

[0072] When the overflow port of the stress control body mold discharges glue, stop the first extruder from extruding glue, and raise the temperature of the stress control body mold to 180 °C to 230 °C, and maintain it for 1 hour 30 minutes to 2 hours 30 minutes;

[0073] Stop heating the stress control body mold. After the stress control body mold is cooled to room temperature, take out the stress control body 1200.

[0074] Further, in some embodiments of the present invention, the steps of manufacturing the stress control body 1200 specifically include:

[0075] Start the first extruder filled with semiconductive raw materials, preheat the first extruder at 110°C to 180°C, and the preheating duration is 35 minutes to 45 minutes;

[0076] Start the stress control body mold with the mold closed and locked, heat it to 130°C to 180°C, and maintain for 35 minutes to 45 minutes;

[0077] Start the first extruder, and make the first extruder inject molten semiconductive raw materials into the stress control body mold;

[0078] When the overflow port of the stress control body mold discharges glue, stop the glue extrusion of the first extruder, and raise the temperature of the stress control body mold to 190°C to 220°C, and maintain for 1 hour and 40 minutes to 2 hours;

[0079] Stop heating the stress control body mold. After the stress control body mold is cooled to room temperature, take out the stress control body 1200.

[0080] In some embodiments of the present invention, the stress control body 1200 is integrally made of a super-smooth semiconductive material. The stress control body 1200 uses a super-smooth semiconductive material, which can effectively and evenly disperse the electric field, reduce the electric field concentration phenomenon, thereby reducing the electric field strength and avoiding the occurrence of breakdown discharge phenomenon; at the same time, it can improve the material bonding degree, ensure a high material bonding degree with the stress cone insulator 1100, and form a more stable stress cone structure; it can also make the stress cone control body structure lighter, while being easy to process and install, saving costs; and it can improve the reliability, and the residual processing stress on the super-smooth surface is extremely small, which helps to improve the reliability and stability of the cable 2000 during power transmission.

[0081] In some embodiments of the present invention, the specific steps of manufacturing the fused stress cone 1000 include:

[0082] Start the second extruder filled with non-crosslinked polyethylene raw materials, preheat the second extruder at 120°C to 200°C, and the preheating duration is 30 minutes to 50 minutes;

[0083] Place the stress control body 1200 at the corresponding position in the cavity of the first composite mold and lock the mold. Start the first composite mold, heat it to 120°C to 170°C, and maintain for 20 minutes to 40 minutes;

[0084] Start the second extruder to inject the molten non-crosslinked polyethylene raw material into the first composite die, and keep the pressure in the first composite die at 10 kg / cm 2 to 18 kg / cm 2 ;

[0085] When the overflow port of the first composite die discharges glue, stop the glue extrusion of the second extruder, heat the first composite die to 150°C to 190°C, and keep it for 40 to 60 minutes to melt, graft, and crosslink the stress control body 1200 and the stress cone insulator 1100 to form the fused stress cone 1000 with an integral welded structure;

[0086] Stop heating the first composite die. After cooling the stress control body die to room temperature, take out the fused stress cone 1000.

[0087] In some embodiments of the present invention, the specific steps for manufacturing the fused stress cone 1000 include:

[0088] Start the second extruder filled with non-crosslinked polyethylene raw material, preheat the second extruder at 130°C to 190°C, and the preheating duration is 35 to 45 minutes;

[0089] Place the stress control body 1200 at the corresponding position in the cavity of the first composite die mold and close the mold lock. Start the first composite die, heat it to 130°C to 160°C, and keep it for 25 to 35 minutes;

[0090] Start the second extruder to inject the molten non-crosslinked polyethylene raw material into the first composite die, and keep the pressure in the first composite die at 11 kg / cm 2 to 17 kg / cm 2 ;

[0091] When the overflow port of the first composite die discharges glue, stop the glue extrusion of the second extruder, heat the first composite die to 160°C to 180°C, and keep it for 45 to 55 minutes to melt, graft, and crosslink the stress control body 1200 and the stress cone insulator 1100 to form the fused stress cone 1000 with an integral welded structure;

[0092] Stop heating the first composite die. After cooling the stress control body die to room temperature, take out the fused stress cone 1000.

[0093] Reference Figure 7, in some embodiments of the present utility model, before on-site fusion welding installation, the outer wall of the cable 2000 is dissected to strip the conductor 2100, the insulating layer 2200, and the insulating shielding layer 2300 from the cable 2000. And polishing and cleaning its surface can improve the fusion welding effect between the cable 2000 and the stress cone insulator 1100, further enhancing the stability and reliability.

[0094] Reference Figure 8 , when the fusion stress cone 1000 is installed by on-site fusion welding, it includes the following steps:

[0095] For on-site fusion welding installation, the fusion stress cone 1000 is sleeved on the cable 2000, and the inner wall of the stress cone insulator 1100 is sequentially attached to the insulating layer 2200 and the insulating shielding layer 2300 of the cable 2000. The fusion stress cone 1000 and the cable 2000 are placed in the second composite mold, and through heating, the stress cone insulator 1100 and the insulating layer 2200 of the cable 2000 are melted, grafted, cross-linked, and combined to form an integral fusion structure.

[0096] In some embodiments of the present utility model, after the second composite mold is started, it is heated to 125°C to 205°C and maintained for 40 minutes to 60 minutes.

[0097] Making the second composite mold work in the state of being heated to 125°C to 205°C and maintained for 40 minutes to 60 minutes can improve the effect of melting, grafting, and combining the insulating layer 2200 of the cable 2000 and the stress cone insulator 1100, enabling the two to be fully fused to form a single entity, that is, the stress cone insulator 1100 is like growing on the insulating layer 2200 of the cable 2000.

[0098] Specifically, in some embodiments of the present utility model, the second composite mold can work at 135°C to 195°C and be maintained for 45 minutes to 55 minutes.

[0099] The stress cone insulator 1100 and the insulating layer 2200 of the cable 2000 are melt grafted and crosslinked to form an integral welded structure, enabling the fusion interface between the two to achieve no air gap, and thus having the characteristic of high breakdown strength. In addition, in the present utility model, the insulating layer 2200 of the cable 2000 is made of crosslinked polyethylene material, while the stress cone insulator 1100 is made of non-crosslinked polyethylene material. The characteristics of this material enable it to be tightly combined with the main body of the insulating layer 2200 of the cable 2000 by means of welding. Specifically, the stress cone insulator 1100 can be crosslinked and combined with the insulating layer 2200 of the cable 2000 through melt grafting to form a seamless integral fusion structure. This combination method enables the fusion interface between two different materials to reach a grafting combination state without air gap and without interface, thereby ensuring that the stress cone insulator 1100 and the insulating layer 2200 of the cable 2000 can be completely fused to form a unified whole.

[0100] In some embodiments of the present utility model, both ends of the stress cone insulator 1100 extend outward along the axis direction of the stress cone insulator 1100. The stress cone insulator 1100 has a connection hole 1140 for sleeving the cable 2000. The connection hole 1140 extends along the axis of the stress cone insulator 1100 and penetrates through the stress cone insulator 1100.

[0101] It can be known that the stress cone insulator 1100 can be directly processed with the connection hole 1140 by the first composite mold, or the connection hole 1140 can be prefabricated without processing and then processed on site according to the size of the cable 2000, and the size of the connection hole 1140 is determined by drilling. During actual on-site processing, the cable 2000 is strung into the connection hole 1140 to obtain an assembly, and then processed with the second composite mold. After cooling, the fused stress cone 1000 will fit the insulating layer 2200 of the cable 2000 to form an integral structure, that is, the stress cone insulator 1100 grows on the cable 2000 like.

[0102] It can be known that in some embodiments of the present utility model, the stress control body 1200 conforms to the stress curve. Therefore, the shape of the mold cavity in the stress control body mold can be designed according to the stress curve, so that the shape of the stress control body 1200 meets the requirements, that is, by using molds with different mold cavity shapes, the shape of the stress control body 1200 can include but is not limited to Figures 9 to 12 the four shapes in; among them, Figures 9 to 12 A1, A2, A3, and A4 in are the same group of fused stress cones 1000, Figures 9 to 12 B1, B2, B3, and B4 in are the same group of fused stress cones 1000, Figures 9 to 12 C1, C2, C3, and C4 in are the same group of fused stress cones 1000,Figures 9 to 12 D1, D2, D3, and D4 in it are the fusion stress cones 1000 of the same group. Combining with the drawings, it can be known that the specific shapes of the stress control body 1200 and the stress cone insulator 1100 can be designed according to the actual working parameters of the cable 2000 and combined with the stress curve, and then the required shapes can be processed by a corresponding mold.

[0103] First Embodiment:

[0104] A prefabricated fusion stress cone 1000 for connecting a cable 2000 includes a stress cone insulator 1100 and a stress control body 1200; both ends of the stress cone insulator 1100 extend outward along the axis direction of the stress cone insulator 1100, and the stress cone insulator 1100 is used for sleeving the cable 2000; the stress control body 1200 is sleeved on the outer wall of the stress cone insulator 1100, and the stress control body 1200 and the stress cone insulator 1100 are combined by melt grafting crosslinking to form an integral welded structure.

[0105] More specifically, in the first embodiment, a prefabricated fusion stress cone 1000 for connecting a cable 2000 includes a stress cone insulator 1100 and a stress control body 1200. The stress cone insulator 1100 is used for sleeving the cable 2000. The stress cone insulator 1100 includes a conical stress cone connection part, a first cylindrical part, and a second cylindrical part. The longest cross-sectional diameter of the first cylindrical part is the first diameter. The wider end of the first cylindrical part is connected to the wider end of the stress cone connection part. The longest cross-sectional diameter of the second cylindrical part is the second diameter, and the second diameter is smaller than the first diameter. One end of the second cylindrical part is connected to the narrower end of the stress cone connection part; the stress control body 1200 is sleeved on the outer wall of the stress cone connection part, and the stress control body 1200 and the stress cone connection part are combined by melt grafting crosslinking to form an integral welded structure.

[0106] Referring to Figures 1 to 6 , in the first embodiment, the first cylindrical part of the stress cone insulator 1100 is the first cylindrical barrel part 1110, the stress cone connection part is the first stress cone connection part 1120, and the second cylindrical part is the second cylindrical barrel part 1130; the first stress cone connection part 1120 is conical. The wider end of the first stress cone connection part 1120 is connected to one end of the first cylindrical barrel part 1110, and the first stress cone connection part 1120 penetrates into the stress control body 1200; one end of the second cylindrical barrel part 1130 is connected to the narrower end of the first stress cone connection part 1120 and the connection is a continuous transition.

[0107] In the first embodiment, a first annular flange 1111 is provided at the connection between the first cylindrical barrel portion 1110 and the first stress cone connection portion 1120. The first annular flange 1111 surrounds the first stress cone connection portion 1120, and the inner wall surface of the first annular flange 1111 is melt-connected to the surface of the stress control body 1200. The provision of the first annular flange 1111 can meet the requirements of the electrical stress structure setting, and further ensure the adaptation to the stress control body 1200 and ensure that the stress cones of the electrical stress installation are evenly distributed and maintained at a certain pressure level, guaranteeing the working stability of the cable 2000 terminal. At the same time, the stress control body 1200 is provided on the first stress cone connection portion 1120 and is melt-connected to the first stress cone connection portion 1120; at this time, the side of the first annular flange 1111 facing the axis of the stress cone insulator 1100 is melt-connected to the surface of the stress control body 1200, which can not only ensure that the stress control body 1200 can be firmly connected to the stress cone insulator 1100, but also ensure that the stress cones of the electrical stress installation are evenly distributed and maintained at a certain pressure level.

[0108] In the first embodiment, the first cylindrical barrel portion 1110, the first stress cone connection portion 1120, and the second cylindrical barrel portion 1130 are of an integrally formed structure. The inner wall opening diameters of the first cylindrical barrel portion 1110, the first stress cone connection portion 1120, and the second cylindrical barrel portion 1130 are the same, and a connection hole 1140 is formed through the stress cone insulator 1100. The connection hole 1140 is used for sleeving the cable 2000. It can be known that the first cylindrical barrel portion 1110, the first stress cone connection portion 1120, and the second cylindrical barrel portion 1130 can be made by a mold with a corresponding cavity shape.

[0109] In the first embodiment, the stress control body 1200 is conical. The wider end of the stress control body 1200 is provided as a third annular flange 1210, so that the end of the stress control body 1200 extends radially outward. When the stress control body 1200 is melt-connected to the stress cone insulator 1100, the outer wall of the third annular flange 1210 is melt-connected to the side of the first annular flange 1111 facing the axis of the stress cone insulator 1100. After the two are matched, it can not only ensure the stability between the two, but also ensure that the stress cones of the electrical stress installation are evenly distributed and maintained at a certain pressure level.

[0110] The stress cone insulator 1100 is grafted and crosslinked with the stress control body 1200, so that there will be no air gap or separation at the interface between the stress cone insulator 1100 and the stress control body 1200, which can improve the stability of the fused stress cone 1000. At the same time, prefabricating the fused stress cone 1000 in advance can facilitate transportation and storage, prevent the performance of the fused stress cone 1000 from degrading due to long-term storage, and can provide spare parts at the power transmission site. When replacement is needed due to problems or new requirements, the stocked items can be directly taken for installation, improving convenience and reliability.

[0111] In the first embodiment, when the fused stress cone 1000 is welded and installed on-site, referring to Figure 8 , the following steps are included:

[0112] For on-site welding and installation, the fused stress cone 1000 is sleeved on the cable 2000, and the inner wall of the stress cone insulator 1100 is sequentially attached to the insulation layer 2200 and the insulation shielding layer 2300 of the cable 2000. The fused stress cone 1000 and the cable 2000 are placed in the second composite mold. By heating, specifically, making the second composite mold work at a temperature of 165°C and maintaining this state for 50 minutes, the stress cone insulator 1100 and the insulation layer 2200 of the cable 2000 can be melt-grafted and crosslinked to form an integral welded structure.

[0113] After cooling and taking out, the insulation layer 2200 of the cable 2000 and the stress cone insulator 1100 will be melt-grafted and combined, so that the two are fully fused to form an integral whole, that is, the stress cone insulator 1100 is like growing on the insulation layer 2200 of the cable 2000. Among them, before on-site welding and installation, the surface of the cable 2000 has been anatomized and polished and cleaned in advance as required.

[0114] Second embodiment:

[0115] The main difference between the second embodiment and the first embodiment is that the overall shape of the fused stress cone 1000 in the second embodiment is different. Referring to Figures 13 to 16 , in the second embodiment, the stress cone insulator 1100 includes a conical cylindrical part 1150 as the first cylindrical part, a second stress cone connecting part 1160 as the stress cone part, and a third cylindrical part 1170 as the second cylindrical part; the second stress cone connecting part 1160 is conical, the wider end of the second stress cone connecting part 1160 is connected to the wider end of the conical cylindrical part 1150, and the second stress cone connecting part 1160 is inserted into the stress control body 1200; one end of the third cylindrical part 1170 is connected to the narrower end of the second stress cone connecting part 1160 and the connection is a continuous transition.

[0116] In the second embodiment, a second annular flange 1151 is provided at the connection between the conical cylindrical body portion 1150 and the second stress cone connection portion 1160. The second annular flange 1151 surrounds the second stress cone connection portion 1160, and the inner wall surface of the second annular flange 1151 is melt-connected to the surface of the stress control body 1200. The conical cylindrical body portion 1150, the second stress cone connection portion 1160, and the third cylindrical body portion 1170 are integrally formed structures. The inner wall opening diameters of the conical cylindrical body portion 1150, the second stress cone connection portion 1160, and the third cylindrical body portion 1170 are the same and form a connection hole 1140 that penetrates the stress cone insulator 1100. The connection hole 1140 is used to sleeve the cable 2000.

[0117] In the second embodiment, the stress control body 1200 is also conical as a whole. A third annular flange 1210 is also provided at the wider end of the stress control body 1200, so that the end of the stress control body 1200 extends radially outward. When the stress control body 1200 is melt-connected to the stress cone insulator 1100, the outer wall of the third annular flange 1210 is melt-connected to the side of the second annular flange 1151 facing the axis of the stress cone insulator 1100. After the two are combined, it can not only ensure the stability between the two, but also ensure that the stress cone distribution of the electrical stress installation is uniform and maintained at a certain pressure level.

[0118] Similarly, in the second embodiment, through the steps of on-site fusion welding installation, the fused stress cone 1000 is sleeved on the cable 2000, and through heating and extrusion, the cable 2000 and the fused stress cone 1000 are melt-connected to form an integral structure.

[0119] It can be known that the main difference between the second embodiment and the first embodiment is that the inclination of a part of the surface of the stress cone insulator 1100 is larger and is conical, which is mainly designed according to the actual requirements of the cable 2000.

[0120] Third embodiment:

[0121] Refer to Figures 17 to 21 It can be seen that the main difference between the third embodiment and the second embodiment is that the shape of the insulator of the fused stress cone 1000 in the third embodiment is different. The stress cone insulator 1100 in the third embodiment is also conical, but compared with the second embodiment, the cone angle of the conical cylindrical body portion 1150 in the third embodiment is smaller. Therefore, the main difference between the third embodiment and the second embodiment is that the surface inclination of the stress cone insulator 1100 is smaller, which is mainly designed according to the actual requirements of the cable 2000.

[0122] Combining the second embodiment and the third embodiment, it can be known that the conical cylindrical body portion 1150, the second stress cone connection portion 1160, and the third cylindrical body portion 1170 can be made by a mold with a corresponding cavity shape.

[0123] In addition, it can be known that the stress cone insulator 1100 can also be made into a structure in the shape of a cylinder as a whole first, then the stress control body 1200 is sleeved, and in cooperation with the stress control body 1200 and the shape of the mold cavity in the corresponding mold, through heating and extrusion, and then in cooperation with the shape of the inner wall of the stress control body 1200 and the interaction of the mold, at the corresponding position of the stress cone insulator 1100, the shape of the first stress cone connection part 1120 or the second stress cone connection part 1160 is pressed and formed, while the shape of the first cylindrical barrel part 1110 and the second cylindrical barrel part 1130, or the conical barrel part 1150 and the third cylindrical barrel part 1170, is formed by pressing the shape of the mold cavity in the mold; furthermore, if the stress cone insulator 1100 is made first and then the stress control body 1200 is sleeved to form the fused stress cone 1000 in the mold, the stress cone insulator 1100 on the fused stress cone 1000 will increase in the direction of extension at both ends compared with the original stress cone insulator 1100 in length, and the thickness will be smaller than the original one.

[0124] It should be noted that in the embodiment of the present invention, the structures of the first composite mold, the second composite mold, the third composite mold, the stress control body mold, the first extruder, and the second extruder are all commonly used equipment in the field of processing, so they will not be specifically described in the present invention.

[0125] According to the embodiment of the present invention, by setting like this, at least the following effects can be achieved. Since the stress control body 1200 satisfies the stress curve, installing the stress control body 1200 on the stress cone insulator 1100 can avoid the occurrence of electric field breakdown, effectively improving the safety and reliability of cable power transmission; the stress cone insulator 1100 and the stress control body 1200 are melt grafted and crosslinked, and at the same time the stress cone insulator 1100 can also be effectively melt grafted and crosslinked with the insulating layer 2200 of the cable 2000, thereby forming an integral welded structure, which can effectively avoid the existence of micro air gaps or separation between the stress control body 1200 and the stress cone insulator 1100 or between the cable 2000 and the stress cone insulator 1100. During the power transmission process of the cable 2000, the occurrence of electric field breakdown can be avoided, effectively improving the safety and reliability of the cable 2000 power transmission; in addition, prefabricating the fused stress cone 1000 in advance not only simplifies the steps and difficulties of on-site welding and installation, but also facilitates transportation and storage. The required fused stress cones 1000 can be stored in advance at the power transmission site, which is convenient for replacement and on-site welding and installation at any time, effectively improving the convenience and reliability.

[0126] The above are only the preferred embodiments of the present utility model. The present utility model is not limited to the above-mentioned implementation manners. As long as it achieves the technical effects of the present utility model by the same means, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included within the scope of protection of the present disclosure. All of them shall fall within the scope of protection of the present utility model. Within the scope of protection of the present utility model, various different modifications and variations can be made to its technical solutions and / or implementation manners.

Claims

1. A prefabricated fusion stress cone for connecting cables (2000), characterized in that: include: A stress cone insulator (1100), wherein two ends of the stress cone insulator (1100) extend outwards along the axis direction of the stress cone insulator (1100), and the stress cone insulator (1100) is used for sleeved cables (2000); A stress control body (1200) is sleeved on the outer wall of the stress cone insulator (1100); the stress control body (1200) and the stress cone insulator (1100) are combined by melt grafting and cross-linking to form an integrated fusion structure.

2. The prefabricated fusion stress cone according to claim 1, characterized in that: The stress cone insulator (1100) comprises a stress cone connecting portion in a cone shape, a first cylindrical portion and a second cylindrical portion, wherein the longest diameter of the cross section of the first cylindrical portion is a first diameter, a wider end of the first cylindrical portion is connected to a wider end of the stress cone connecting portion, the longest diameter of the cross section of the second cylindrical portion is a second diameter, the second diameter is smaller than the first diameter, one end of the second cylindrical portion is connected to a narrower end of the stress cone connecting portion, the stress cone connecting portion is penetrated into the stress control body (1200), and the stress cone connecting portion and the stress control body (1200) are melt-grafted and cross-linked to form an integrated fusion structure.

3. The prefabricated fusion stress cone according to claim 2, characterized in that: The stress cone connecting portion, the first cylindrical portion and the second cylindrical portion are an integrally formed structure, the inner wall opening diameters of the stress cone connecting portion, the first cylindrical portion and the second cylindrical portion are the same, and a connecting hole (1140) is formed that passes through the stress cone insulator (1100), and the connecting hole (1140) is used for sleeve-connecting the cable (2000).

4. The prefabricated fusion stress cone according to claim 2 or 3, characterized in that: The stress cone connection portion is a first stress cone connection portion (1120); The first barrel portion is a first cylindrical barrel portion (1110), and one end of the first cylindrical barrel portion (1110) is connected to a wider end of the first stress cone connecting portion (1120); The second barrel portion is a second cylindrical barrel portion (1130), one end of which is connected to a narrower end of the first stress cone connecting portion (1120), and the connection is a continuous transition.

5. The prefabricated fusion stress cone according to claim 4, characterized in that: A first annular flange (1111) is provided at the connection between the first cylindrical barrel portion (1110) and the first stress cone connecting portion (1120), and the inner wall surface of the first annular flange (1111) is melt-connected to the surface of the stress control body (1200).

6. The prefabricated fusion stress cone according to claim 2 or 3, characterized in that: The stress cone connection portion is a second stress cone connection portion (1160); The first cylindrical body portion is a conical cylindrical body portion (1150), and a wider end of the conical cylindrical body portion (1150) is connected to a wider end of the second stress cone connecting portion (1160); The second barrel portion is a third cylindrical barrel portion (1170), one end of the third cylindrical barrel portion (1170) is connected to a narrower end of the second stress cone connecting portion (1160), and the connection is a continuous transition.

7. The prefabricated fusion stress cone according to claim 6, characterized in that: A second annular flange (1151) is provided at the connection between the conical cylindrical body (1150) and the second stress cone connecting portion (1160), and the inner wall surface of the second annular flange (1151) is melt-connected to the surface of the stress control body (1200).

8. The prefabricated fusion stress cone according to any one of claims 1 to 3, characterized in that: The stress cone insulator (1100) is made of non-cross-linked polyethylene material.

9. The prefabricated fusion stress cone according to any one of claims 1 to 3, characterized in that: The stress control body (1200) gradually widens from the first end to the second end, the second end of the stress control body (1200) forms a wide opening, and the first end of the stress control body (1200) gradually narrows along the axial direction of the stress control body (1200) to form a relatively small end.

10. The prefabricated fusion stress cone according to any one of claims 1 to 3, characterized in that: The stress control body (1200) is in a cone shape, and a wider end of the stress control body (1200) is arranged as a third annular flange (1210), so that the end of the stress control body (1200) extends radially outward.

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