Prefabricated stress cone insulator

Abstract

The utility model relates to a high-voltage power cable connecting accessory, and discloses a prefabricated stress cone insulator which can be prefabricated in advance, can be crosslinked with a cable to form a whole, effectively eliminates a micro air gap between a stress cone and an insulating layer of the cable, prevents polarization, and effectively improves the electrical performance stability and power transmission safety of the cable during power transmission. The stress cone comprises a conical stress cone part, the longest diameter of the cross section of the first cylinder part is a first diameter, the wider end of the first cylinder part is connected with the wider end of the stress cone part, an annular flange is arranged at the joint of the first cylinder part and the stress cone part, and the annular flange surrounds the stress cone part; the longest diameter of the cross section of the second cylinder part is a second diameter, the second diameter is smaller than the first diameter, one end of the second cylinder part is connected with the narrower end of the stress cone part, and the joint is in continuous transition; the surface, facing the side wall of the stress cone part, of the ring flange and the surface of the first stress cone part form a stress coating part used for coating semi-conductive raw materials.

Description

Technical Field

[0001] The utility model relates to a connecting accessory for high-voltage power cables, in particular to a prefabricated stress cone insulator. 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 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 through 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 and the 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 leading to breakdown of the insulation layer. Moreover, the plug-and-play connector at the cable terminal needs to be prefabricated in advance, and it 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 danger of the micro-air gap interface. Content of the Utility Model

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

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

[0006] A stress cone part in a conical shape;

[0007] A first cylindrical part, the longest diameter of the cross-section of the first cylindrical part is a first diameter, the wider end of the first cylindrical part is connected to the wider end of the stress cone part, and a ring flange is provided at the connection between the first cylindrical part and the stress cone part, and the ring flange surrounds the stress cone part;

[0008] A second cylindrical part, the longest diameter of the cross-section of the second cylindrical part is a second diameter, the second diameter is smaller than the first diameter, and one end of the second cylindrical part is connected to the narrower end of the stress cone part and the connection is a continuous transition;

[0009] Wherein, the surface of the annular flange facing the side wall of the stress cone part and the surface of the stress cone part form a stress coating part, and the surface of the stress coating part is used for coating a semiconductive material.

[0010] According to some embodiments of the present invention, the stress cone part is a first stress cone part; the first cylindrical part is a first cylindrical barrel part, one end of the first cylindrical barrel part is connected to the wider end of the first stress cone part, and the annular flange at the connection between the first cylindrical barrel part and the first stress cone part is a first annular flange; the second cylindrical part is a second cylindrical barrel part, one end of the second cylindrical barrel part is connected to the narrower end of the first stress cone part and the connection is a continuous transition.

[0011] According to some embodiments of the present invention, the first cylindrical barrel part, the first stress cone part and the second cylindrical barrel part are of an integrally formed structure.

[0012] According to some embodiments of the present invention, the inner wall opening diameters of the first cylindrical barrel part, the first stress cone part and the second cylindrical barrel part are the same and form a connection hole penetrating through the stress cone insulator, and the connection hole is used for sleeving a cable.

[0013] According to some embodiments of the present invention, the stress cone part is a second stress cone part; the first cylindrical part is a conical barrel part, the wider end of the conical barrel part is connected to the wider end of the second stress cone part, and the annular flange at the connection between the conical barrel part and the second stress cone part is a second annular flange; the second cylindrical part is a third cylindrical barrel part, one end of the third cylindrical barrel part is connected to the narrower end of the second stress cone part and the connection is a continuous transition.

[0014] According to some embodiments of the present invention, the conical barrel part, the second stress cone part and the third cylindrical barrel part are of an integrally formed structure.

[0015] According to some embodiments of the present invention, the inner wall opening diameters of the conical barrel part, the second stress cone part and the third cylindrical barrel part are the same and form a connection hole penetrating through the stress cone insulator, and the connection hole is used for sleeving a cable.

[0016] According to some embodiments of the present invention, the shape of the stress coating part conforms to a stress curve.

[0017] According to some embodiments of the present invention, the stress cone insulator is made of non-crosslinked polyethylene.

[0018] According to some embodiments of the present utility model, the inner wall opening diameters of the first cylindrical part, the stress cone part, and the second cylindrical part are the same, and a connection hole penetrating through the stress cone insulator is formed, and the connection hole is used for sleeving a cable.

[0019] The embodiments of the present utility model at least have the following beneficial effects: A stress coating part is provided on the surface of the stress cone insulator, and a semi-conductive raw material can be positioned and coated to form a stress control body, which can make the electrical stress distribute uniformly according to the stress cone and maintain at a certain pressure level, ensuring the stability during cable power transmission. At the same time, the stress coating part has a positioning effect, which is convenient for on-site coating, improving the installation efficiency. At the same time, when melting and connecting with the cable on-site, the stress control body and the surface of the stress cone insulator will be compounded and crosslinked, facilitating the formation of an integral welding structure;

[0020] The stress cone insulator can be effectively melt-grafted, crosslinked and combined with the insulation layer of the cable, thereby forming an integral welding structure, which can effectively avoid the situation that there are micro air gaps or separations between the cable and the stress cone insulator. During the cable power transmission operation, it can eliminate or avoid the situation that the micro air gaps in the insulation structure cause electric field distortion and breakdown, effectively improving the safety and reliability of cable power transmission;

[0021] In addition, prefabricating the stress cone insulator in advance not only simplifies the steps and difficulties of on-site welding installation, but also facilitates transportation and storage. The power transmission site can store the required stress cone insulators in advance, which is convenient for replacement and on-site welding installation at any time, effectively improving the convenience and reliability.

[0022] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0024] Figure 1 is a schematic structural diagram of the stress cone insulator applying the first embodiment of the present utility model;

[0025] Figure 2 is Figure 1 a schematic structural diagram of another angle showing the structure;

[0026] Figure 3 is Figure 2 a cross-sectional view showing the structure;

[0027] Figure 4 is Figure 3 a cross-sectional view of another angle showing the structure;

[0028] Figure 5 is Figure 1 a cross-sectional view of the structure shown in plan view;

[0029] Figure 6 is a schematic structural view of the cable installed by applying the embodiment of the present utility model;

[0030] Figure 7 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;

[0031] Figure 8 is a schematic structural view of the stress cone insulator of the second embodiment of the present utility model;

[0032] Figure 9 is Figure 8 a schematic structural view of the structure from another angle;

[0033] Figure 10 is Figure 8 a cross-sectional view of the structure shown in plan view;

[0034] Figure 11 is a schematic structural view of the stress cone insulator of the third embodiment of the present utility model;

[0035] Figure 12 is Figure 11 a schematic structural view of the structure from another angle;

[0036] Figure 13 is Figure 11 a cross-sectional view of the structure shown in plan view.

[0037] Reference numerals:

[0038]

[0039] Detailed implementation manners

[0040] 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, solution and effects of the present utility model. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0041] It should be noted that, unless otherwise specified, when a certain 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 descriptions such as up, down, left, right, top, bottom, etc. used in the present utility model are only relative to the mutual positional relationship of the various components of the present utility model in the drawings.

[0042] 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 art 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.

[0043] 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.

[0044] Reference Figures 1 to 5 、or Figures 8 to 10 、or Figures 11 to 13 , a method for manufacturing a prefabricated fused stress cone, comprising the following steps:

[0045] Manufacture a stress cone insulator 1100, the stress cone insulator 1100 is made of non-crosslinked polyethylene, both ends of the stress cone insulator 1100 extend outward along the axis direction of the stress cone insulator 1100, and a stress coating portion in a conical shape is provided on the outer wall of the stress cone insulator 1100;

[0046] Manufacture a fused stress cone, coat a semiconductive raw material on the stress coating portion to form a stress control body, and after solidification, the stress control body and the stress cone insulator 1100 form an integral structure of the fused stress cone.

[0047] It should be noted that the specific method of coating the semiconductive raw material on the stress coating portion can be one of coating, spraying or applying, and those skilled in the art can select a suitable method for coating according to actual needs, and the semiconductive raw material may be in a liquid or gaseous state during coating.

[0048] In some embodiments of the present utility model, the stress control body is in a conical shape.

[0049] It can be known that the stress control body is made of a semiconductive raw material, and those skilled in the art can determine the stress curve parameters of the stress coating portion according to the requirements of the actual transmission parameters of the cable 2000, and then can determine the shape of the inner cavity of the stress cone insulator mold so that the design of the shape of the stress coating portion meets the requirements.

[0050] It can be known that the overall shape of the stress cone insulator 1100 can also be designed according to the requirements of the design, corresponding to the shape of the model in the stress cone insulator mold, so that the shape of the stress cone insulator 1100 meets the requirements. That is, the stress cone insulator 1100 and the stress control body 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 the stress control body can be in a tight state with the surface of the stress coating part by means of coating. When it is welded and installed on the cable on site, the stress control body and the surface of the stress coating part can be compound cross-linked, that is, the stress control body 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 neither of them will separate or have air gaps under long-term high temperature and high pressure, effectively improving safety.

[0051] It can be known that the insulating layer 2200 of the cable 2000 is made of cross-linked polyethylene material. However, when two objects made of the same cross-linked polyethylene material attempt to be connected by melting, it is very difficult to achieve true fusion between them. This is because after melting connection, there is often an obvious and non-fused interface between the two. Such microscopic air gaps are the hidden dangers that lead to electric field distortion and promote the generation of electrical trees, and then the risk of breakdown during the operation of the cable terminal.

[0052] In addition, in the present utility model, the stress cone insulator 1100 is made of non-cross-linked polyethylene material, and the characteristics of this material enable it to achieve a tight combination with the body of the insulating layer 2200 of the cable 2000 by means of welding. Specifically, the stress cone insulator 1100 and the insulating layer 2200 of the cable 2000 can achieve cross-linking combination through 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.

[0053] This fusion not only greatly improves the breakdown strength, but also forms a thermosetting integral structure due to the combination and cross-linking of non-cross-linked polyethylene and cross-linked 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 integral structure also exhibits better high-temperature resistance performance, enabling the cable 2000 and the fused stress cone 1000 to maintain long-term stable operation when the operating temperature of the cable conductor is at 115°C, thereby significantly improving the stability and safety of the cable during power transmission.

[0054] ReferenceFigure 6 , 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 improving the stability and reliability.

[0055] Reference Figure 7 , in some embodiments of the present utility model, the following steps are further included:

[0056] On-site fusion welding installation, the fusion stress cone is sleeved on the cable 2000, and the inner wall of the stress cone insulator 1100 is successively attached to the insulating layer 2200 and the insulating shielding layer of the cable 2000. The fusion stress cone and the cable 2000 are placed in a composite mold, and through heating, the stress cone insulator 1100 is respectively melt-grafted and crosslinked with the stress control body and the insulating layer 2200 of the cable 2000 to form an integral fusion welding structure.

[0057] In some embodiments of the present utility model, after the composite mold is started, it is heated to 125°C to 205°C and maintained for 40 minutes to 60 minutes.

[0058] Making the 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 melt-grafting combination of the stress cone insulator 1100 with the stress control body and the insulating layer 2200 of the cable 2000, enabling the stress cone insulator 1100 to be fully fused with the stress control body or the stress cone insulator 1100 to be fully fused with the insulating layer 2200 of the cable 2000 to respectively form the same whole, that is, the stress cone insulator 1100 is like growing on the insulating layer 2200 of the cable 2000, and the stress control body is like growing on the stress cone insulator 1100.

[0059] Specifically, in some embodiments of the present utility model, the composite mold can work at 135°C to 195°C and be maintained for 45 minutes to 55 minutes.

[0060] Specifically, in some embodiments of the present utility model, the composite mold can work at 150°C to 190°C and be maintained for 45 minutes to 55 minutes.

[0061] The stress cone insulator 1100 and the insulating layer 2200 of the cable 2000 are melt-grafted and crosslinked to form an integral fusion welding structure, enabling the fusion interface between the two to achieve a grafting combination state without air gaps and without demarcation interfaces, and thus having the characteristic of high breakdown strength.

[0062] 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.

[0063] It can be known that the connection hole 1140 of the stress cone insulator 1100 can be directly processed by a stress cone insulator mold, or the processing hole may not be prefabricated, and the size of the connection hole 1140 is determined by processing according to the size of the cable 2000 on-site. During actual on-site processing, the cable 2000 is strung into the connection hole 1140 to obtain an assembled body, and then processed using a composite mold. After cooling, the fused stress cone will adhere to the insulating layer 2200 of the cable 2000 to form an integral structure, that is, the stress cone insulator 1100 is like growing on the cable 2000.

[0064] In some embodiments of the present utility model, the stress control body is integrally made of a super-smooth semiconductive material. The use of a super-smooth semiconductive material for the stress control body 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; 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 reliability, with extremely small residual processing stress on the super-smooth surface, which helps to improve the reliability and stability of the cable 2000 during power transmission.

[0065] In some embodiments of the present utility model, the specific steps for manufacturing the stress cone insulator 1100 include:

[0066] Start the extruder loaded with non-crosslinked polyethylene raw materials, preheat the extruder at 120°C to 200°C, and the preheating duration is 30 minutes to 50 minutes;

[0067] Start the stress cone insulator mold, heat it to 120°C to 170°C, and maintain for 20 minutes to 40 minutes;

[0068] Start the extruder, inject the molten non-crosslinked polyethylene raw materials from the extruder into the stress cone insulator mold, and keep the pressure in the stress cone insulator mold at 10 kg / cm 2 to 18 kg / cm 2 ;

[0069] When the glue overflows from the glue overflow port of the stress cone insulator mold, stop the extruder from extruding glue, and take out the stress cone insulator 1100 after cooling.

[0070] In some embodiments of the present utility model, the specific steps for manufacturing the stress cone insulator 1100 include:

[0071] Start the extruder loaded with non-crosslinked polyethylene raw material, preheat the extruder at 130°C to 190°C, and the preheating duration is 35 minutes to 45 minutes;

[0072] Start the stress cone insulator mold, heat it to 130°C to 160°C, and maintain for 25 minutes to 35 minutes;

[0073] Start the extruder, make the extruder inject the molten non-crosslinked polyethylene raw material into the stress cone insulator mold, and keep the pressure in the stress cone insulator mold at 11 kg / cm 2 to 17 kg / cm 2 ;

[0074] When the glue overflows from the glue overflow port of the stress cone insulator mold, stop the extruder from extruding glue, and take out the stress cone insulator 1100 after cooling.

[0075] A prefabricated stress cone insulator 1100, comprising:

[0076] A stress cone part in a conical shape;

[0077] A first 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 part, and a ring flange is provided at the connection between the first cylindrical part and the stress cone part, and the ring flange surrounds the stress cone part;

[0078] A second cylindrical part, the longest cross-sectional diameter of the second cylindrical part is the second diameter, the second diameter is smaller than the first diameter, and one end of the second cylindrical part is connected to the narrower end of the stress cone part and the connection is a continuous transition;

[0079] Wherein, the side wall surface of the ring flange facing the stress cone part and the surface of the stress cone part form a stress coating part, and the surface of the stress coating part is used for coating semi-conductive raw material.

[0080] In some embodiments of the present utility model, the inner wall opening diameters of the first cylindrical part, the stress cone part and the second cylindrical part are the same, and a connection hole 1140 is formed through the stress cone insulator 1100, and the connection hole 1140 is used for sleeving the cable 2000.

[0081] The first embodiment:

[0082] Specifically, in the first embodiment, the specific steps for manufacturing the stress cone insulator 1100 include:

[0083] Start the extruder loaded with non-crosslinked polyethylene raw material, preheat the extruder at 160°C, and the preheating duration is 40 minutes;

[0084] Start the stress cone insulator mold, heat it to 145°C, and maintain for 30 minutes;

[0085] Start the extruder, and let the extruder inject molten non-crosslinked polyethylene raw material into the stress cone insulator mold, and keep the pressure in the stress cone insulator mold at 14 kg / cm 2 ;

[0086] When the glue overflows from the glue overflow port of the stress cone insulator mold, stop the extruder from extruding glue, and take out the stress cone insulator 1100 after cooling.

[0087] The cavity shape in the stress cone insulator mold has been designed in advance according to the set requirements, so that the stress cone insulator 1100 can form a stress coating part.

[0088] In the first embodiment, after applying the manufacturing method of the above embodiment, a stress cone insulator 1100 is made, which is used to connect the cable 2000. The stress cone insulator 1100 is made of non-crosslinked polyethylene. The two ends of the stress cone insulator 1100 extend outward along the axis direction of the stress cone insulator 1100, and the outer wall of the stress cone insulator 1100 is provided with a conical stress coating part; the stress coating part is used for coating molten semiconductive raw material.

[0089] Refer to Figures 1 to 5 , in the first embodiment, the stress cone insulator 1100 includes;

[0090] A first cylindrical barrel part 1110 as the first barrel part, a first stress cone part 1120 as the stress cone part, and a second cylindrical barrel part 1130 as the second barrel part; the first stress cone part 1120 in a conical shape; the longest diameter of the cross-section of the first cylindrical barrel part 1110 is the first diameter. One end of the first cylindrical barrel part 1110 is connected to the wider end of the first stress cone part 1120. The annular flange at the connection of the first cylindrical barrel part 1110 and the first stress cone part 1120 is the first annular flange 1111, and the first annular flange 1111 surrounds the first stress cone part 1120; the second cylindrical barrel part 1130, the longest diameter of the cross-section of the second cylindrical barrel part 1130 is the second diameter, and the second diameter is smaller than the first diameter. One end of the second cylindrical barrel part 1130 is connected to the narrower end of the second stress cone part 1160 and the connection is a continuous transition; wherein, the surface of the first annular flange 1111 facing the side wall of the first stress cone part 1120 and the surface of the first stress cone part 1120 form a stress coating part for coating semiconductive raw material.

[0091] The outer shape of the stress coating part can meet the requirements of the power stress structure setting, thereby ensuring adaptation to the stress control body and ensuring uniform stress cone distribution after electrical stress installation and maintaining at a certain pressure level, guaranteeing the working stability of the cable 2000 terminal. At the same time, a semiconductive raw material is coated on the stress coating part to form a stress control body. Through further heating and extrusion, the stress control body can be melt-connected with the stress cone insulator; it can ensure uniform stress cone distribution during electrical stress installation and maintain at a certain pressure level.

[0092] In the first embodiment, the first cylindrical barrel part 1110, the first stress cone part 1120, and the second cylindrical barrel part 1130 are of an integrally formed structure. The inner wall opening diameters of the first cylindrical barrel part 1110, the first stress cone part 1120, and the second cylindrical barrel part 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 part 1110, the first stress cone part 1120, and the second cylindrical barrel part 1130 can be made by molds with corresponding cavity shapes.

[0093] By using the above processing parameters, the stress cone insulator 1100 and the stress control body can be fully grafted and crosslinked, so that there will be no air gap or separation at the interface between the stress cone insulator 1100 and the stress control body, which can improve the stability of the fused stress cone. At the same time, prefabricating the fused stress cone in advance can facilitate transportation and storage, and will not cause the performance of the fused stress cone to decline due to long-term storage. And it can provide spare parts at the power transmission site. When problems need to be replaced or there are new requirements, the stocked goods can be directly taken for installation, improving convenience and reliability.

[0094] In the first embodiment, when the fused stress cone is welded and installed on-site, refer to Figure 7 , and it also includes the following steps:

[0095] For on-site welding installation, the fused stress cone is sleeved on the cable 2000, and the inner wall of the stress cone insulator 1100 is successively attached to the insulation layer 2200 and the insulation shielding layer of the cable 2000. The fused stress cone and the cable 2000 are placed in a composite mold. By heating, specifically, making the composite mold work at a temperature of 165°C and maintaining for 50 minutes, the stress cone insulator 1100 and the insulation layer 2200 of the cable 2000 can be melt-grafted and crosslinked together, and the stress cone insulator 1100 and the stress control body can be melt-grafted and crosslinked together, respectively forming an integral welded structure.

[0096] After cooling, take it out, then the insulating 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 insulating layer 2200 of the cable 2000. Similarly, the stress control body is also like growing on the stress cone insulator 1100. 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.

[0097] Second Embodiment:

[0098] The main difference between the second embodiment and the first embodiment is that the cavity shape of the corresponding mold in the second embodiment is different, that is, the shape of the stress cone insulator 1100 will be different, but the overall process is still carried out according to the prefabricated stress cone insulator of the present utility model. Among them, the temperature and the heating and extrusion time may be appropriately adjusted according to actual needs.

[0099] Refer to Figures 8 to 10 , in the second embodiment, the stress cone insulator 1100 includes a conical cylindrical part 1150 as the first cylindrical part, a second stress cone part 1160 as the stress cone part, and a third cylindrical part 1170 as the second cylindrical part; the second stress cone part 1160 is conical, the wider end of the conical cylindrical part 1150 is connected to the wider end of the second stress cone part 1160, and the annular flange at the connection between the conical cylindrical part 1150 and the second stress cone part 1160 is the second annular flange 1151, and the second annular flange 1151 surrounds the second stress cone part 1160; one end of the third cylindrical part 1170 is connected to the narrower end of the first stress cone part 1120 and the connection is continuously transitional; among them, the surface of the second annular flange 1151 facing the side wall of the second stress cone part 1160 and the surface of the second stress cone part 1160 form a stress coating part for coating a semi-conductive raw material.

[0100] The conical cylindrical part 1150, the first stress cone part 1120, and the third cylindrical part 1170 are of an integrally formed structure. The inner wall opening diameters of the conical cylindrical part 1150, the first stress cone part 1120, and the third cylindrical part 1170 are the same and form a connection hole 1140 penetrating through the stress cone insulator 1100. The connection hole 1140 is used for sleeving the cable 2000.

[0101] Similarly, in the second embodiment, it is also through the steps of on-site welding and installation that the fused stress cone is sleeved on the cable 2000, and through heating and extrusion, the cable 2000 and the fused stress cone are melt-connected to form an integral structure.

[0102] It can be known that the main difference between the second embodiment and the first embodiment lies in that a part of the surface of the stress cone insulator 1100 has a greater inclination and is cone-shaped, which is mainly designed according to the actual requirements of the cable 2000.

[0103] Third Embodiment:

[0104] Referring to Figures 11 to 13 , the main difference between the third embodiment and the second embodiment is that the cavity shape of the corresponding mold in the third embodiment is different, that is, the shape of the fused stress cone insulator will be different. The stress cone insulator 1100 in the third embodiment is also cone-shaped, but compared with the second embodiment, the cone angle of the conical cylinder part 1150 in the third embodiment is smaller. Therefore, the main difference between the third embodiment and the second embodiment lies in 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.

[0105] Combining the second embodiment and the third embodiment, it can be known that the conical cylinder part 1150, the first stress cone part 1120, and the third cylindrical cylinder part 1170 can be made by molds with corresponding cavity shapes.

[0106] It should be noted that in the embodiments of the present invention, the molds, composite molds, extruders, and the structures of the extruders mentioned are all commonly used equipment in the field of processing, so they will not be specifically described in the present invention.

[0107] According to the embodiments of the present invention, by setting it like this, at least the following effects can be achieved. The surface of the stress cone insulator 1100 is provided with a stress coating part, which can position and coat the semi-conductive raw material to form a stress control body, so that the electrical stress can be evenly distributed according to the stress cone and maintained at a certain pressure level to ensure the stability of the cable 2000 during power transmission. At the same time, the stress coating part has a positioning effect, which is convenient for on-site coating and improves the installation efficiency. At the same time, when it is melt-connected with the cable on-site, the stress control body and the surface of the stress cone insulator 1100 will be compounded and crosslinked to form an integral welded structure;

[0108] The stress cone insulator 1100 is made of non-crosslinked polyethylene. The properties of this material enable it to combine and crosslink with crosslinked polyethylene, that is, the stress cone insulator 1100 can be combined and crosslinked with the insulating layer 2200 of the cable 2000 by means of melt grafting to form a seamless integrated 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 fully fused to form a unified whole. During the power transmission operation of the cable 2000, the situation of electric field distortion and breakdown caused by microscopic air gaps in the insulation structure can be eliminated or avoided, effectively improving the safety and reliability of the power transmission of the cable 2000;

[0109] In addition, prefabricating the stress cone insulator in advance not only simplifies the steps and difficulties of on-site welding installation, but also facilitates transportation and storage. The stress cone insulator 1100 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 convenience and reliability.

[0110] The above are only the preferred embodiments of the present invention. The present invention is not limited to the above-mentioned implementation manners. As long as it achieves the technical effects of the present invention 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 protection scope of the present disclosure. All should belong to the protection scope of the present invention. Within the protection scope of the present invention, various different modifications and changes can be made to its technical solutions and / or implementation manners.

Claims

1. A prefabricated stress cone insulator, characterized in that: include: A stress cone portion in a cone shape; A first 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 portion, and an annular flange is provided at the connection between the first cylindrical portion and the stress cone portion, and the annular flange surrounds the stress cone portion; A second cylindrical portion, wherein 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, and one end of the second cylindrical portion is connected to a narrower end of the stress cone portion and the connection is a continuous transition; The surface of the annular flange facing the side wall of the stress cone portion and the surface of the stress cone portion form a stress coating portion, and the surface of the stress coating portion is used for coating a semi-conductive material.

2. The prefabricated stress cone insulator according to claim 1, characterized in that: The stress cone portion is a first stress cone portion (1120); The first barrel portion is a first cylindrical barrel portion (1110), one end of the first cylindrical barrel portion (1110) is connected to a wider end of the first stress cone portion (1120), and the annular flange at the connection between the first cylindrical barrel portion (1110) and the first stress cone portion (1120) is a first annular flange (1111); 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 portion (1120), and the connection is a continuous transition.

3. The prefabricated stress cone insulator according to claim 2, characterized in that: The first cylindrical barrel portion (1110), the first stress cone portion (1120) and the second cylindrical barrel portion (1130) are an integrally formed structure.

4. The prefabricated stress cone insulator according to claim 2, characterized in that: The inner wall opening diameters of the first cylindrical barrel portion (1110), the first stress cone portion (1120) and the second cylindrical barrel portion (1130) are the same, and form a connecting hole (1140) that passes through the stress cone insulator (1100), and the connecting hole (1140) is used for sleeve connection of the cable (2000).

5. The prefabricated stress cone insulator according to claim 1, characterized in that: The stress cone portion is a second stress cone portion (1160); The first cylindrical portion is a conical cylindrical portion (1150), a wider end of the conical cylindrical portion (1150) is connected to a wider end of the second stress cone portion (1160), and the annular flange at the connection between the conical cylindrical portion (1150) and the second stress cone portion (1160) is a second annular flange (1151); 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 portion (1160), and the connection is a continuous transition.

6. The prefabricated stress cone insulator according to claim 5, characterized in that: The conical barrel portion (1150), the second stress cone portion (1160) and the third cylindrical barrel portion (1170) are an integrally formed structure.

7. The prefabricated stress cone insulator according to claim 5, characterized in that: The inner wall openings of the conical barrel portion (1150), the second stress cone portion (1160) and the third cylindrical barrel portion (1170) have the same diameter and form a connecting hole (1140) that passes through the stress cone insulator (1100), and the connecting hole (1140) is used for sleeve connection of the cable (2000).

8. The prefabricated stress cone insulator according to any one of claims 2 to 7, characterized in that: The shape of the stress coating portion conforms to a stress curve.

9. The prefabricated stress cone insulator according to any one of claims 2 to 7, characterized in that: The stress cone insulator (1100) is made of non-cross-linked polyethylene material.

10. The prefabricated stress cone insulator according to claim 1, characterized in that: The inner wall openings of the first cylindrical portion, the stress cone portion and the second cylindrical portion have the same diameter and form a connection hole (1140) penetrating the stress cone insulator (1100). The connection hole (1140) is used for sleeve connection of a cable (2000).

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