Structure and manufacturing method of a particle trapping device for GIL three-post insulators

Abstract

This invention relates to the field of power transmission and distribution equipment manufacturing technology, and particularly to the structure and manufacturing method of a particle capture device for GIL three-post insulators. The device includes a metal enclosed housing, a three-post insulator, a particle capture device, a grid mesh, and concave-convex riveting holes formed by a rivetless SPR self-piercing riveting process. The particle capture device is a thin-walled cylindrical structure installed on the outer circumference of the three-post insulator, contacting the inner wall of the coaxially arranged metal enclosed housing to form an equipotential grounding connection. The outer surface of the particle capture device has grid mesh evenly distributed along the axial direction, with rounded edges. The mesh evenly distributed along the axial direction extends to the bottom of the particle capture device and connects with a low-voltage equipotential region. During operation, the grid mesh of the particle capture device captures charged particles under the action of an electric field, ultimately improving particle capture efficiency.

Description

Technical Field

[0001] This invention relates to the field of power transmission and distribution equipment manufacturing technology, specifically to the structure and manufacturing method of a particle capture device for GIL three-post insulators. Background Technology

[0002] Gas-insulated transmission line (GIL) technology is a crucial core technology in the field of high-voltage power transmission and distribution. It boasts advantages such as large capacity, low loss, zero magnetic leakage, and adaptability to long-distance transmission, and is widely used in urban power grids, underground transmission, and inter-regional transmission projects. In GIL systems, the three-post insulator, as a key component, provides mechanical support and electrical insulation for the high-voltage conductor, making it one of the core components ensuring stable system operation.

[0003] However, during operation, GIL gas chambers can generate floating charged metal particles due to high-voltage electric fields, vibrations, or residual impurities from the production process. The presence of these particles within the gas-insulated space poses a threat to the three-post insulator: firstly, when charged particles adhere to the insulator surface or high-voltage conductors, they can easily cause local electric field distortion, leading to flashover on the insulation surface; in severe cases, this may cause partial discharge or insulation breakdown. Secondly, the long-term accumulation of charged particles under the influence of the high-voltage electric field can damage the surface structure of the insulator, ultimately leading to a decrease in the mechanical strength of the three-post insulator, or even serious safety accidents such as rupture or explosion.

[0004] To address the aforementioned issues, existing technologies often install particle capture devices on or near the outer circumference of three-post insulators to capture floating charged metal particles. However, these devices still have several shortcomings in practical applications: Firstly, some particle capture devices have simple designs and limited capture efficiency; moreover, they are often fixed by welding or bolting, which are prone to loosening or deformation due to long-term vibration or thermal expansion and contraction, affecting the stable operation of the device. Secondly, traditional welding fixing methods require multiple processes such as welding, weld grinding, and polishing, resulting in high manufacturing costs and the problem of welding thermal deformation, reducing the installation accuracy and consistency of the device. In summary, to ensure the stable operation of three-post insulators, this invention designs a highly efficient and reliable particle capture device that captures floating charged metal particles in the circumferential direction of the three-post insulator. This device features optimized structure, stable installation, high capture efficiency, simplified manufacturing process, and convenient maintenance, thereby comprehensively improving the operational safety and stability of the GIL system. Summary of the Invention

[0005] The purpose of this invention is to provide a structure and manufacturing method of a particle trapping device for GIL three-post insulators, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A particle trapping device for a GIL three-post insulator includes a metal enclosed housing, a three-post insulator, a particle trapping device, concave and convex riveting holes, and a grid mesh. The particle trapping device is a thin-walled cylindrical structure installed on the outer circumference of the three-post insulator, and contacts the inner wall of the coaxially arranged metal enclosed housing to form an equipotential grounding connection. The outer surface of the particle trapping device is uniformly distributed with grid mesh holes. The overlap of the particle trapping device adopts a butt-edge bending overlap structure. The butt-edge bending overlap structure is fixed by a rivetless SPR self-piercing riveting process. After riveting, the inner surface forms continuous concave holes, and the outer surface forms a boss with a height not exceeding 2mm, and the inner surface presents a smooth transition. The butt-edge bending overlap structure includes a bent edge and an overlap edge.

[0008] According to the above technical solution, the edges of the grid mesh are rounded, and the mesh is evenly distributed along the axial direction to the bottom of the particle capture device and is connected to the low-voltage equipotential region.

[0009] According to the above technical solution, the butt joint bending and overlapping structure includes a Z-shaped bending edge formed by die stamping at one end and a flat overlapping edge at the other end. The contact angle α between the bending edge and the overlapping edge is controlled between 30° and 45°.

[0010] According to the above technical solution, the diameter of the concave holes formed in the overlapping area by the rivetless SPR self-piercing riveting process is 3mm to 5mm, the hole depth is 1.5mm to 2mm, and the concave holes are evenly arranged in a straight line with a hole spacing of S. The distance between the outer concave hole and the edge of the overlapping side is S / 2.

[0011] According to the above technical solution, the height of the riveting boss of the particle capturing device is controlled between 1.5mm and 2mm, and the inner and outer edges of the boss are smoothed to reduce electric field distortion and improve particle capturing efficiency.

[0012] According to the above technical solution, the manufacturing method of the particle trapping device for GIL three-post insulators includes the following steps:

[0013] S1. Cut the aluminum sheet into rectangular plates and use a punch press to punch the mesh and fixing holes for particle capture grid.

[0014] S2. The aluminum sheet is rolled into a cylindrical shape using a rolling equipment, and then one side of the sheet is punched and bent into a Z-shape using a custom mold and overlapped with the other side.

[0015] S3. The rivetless SPR self-piercing riveting process is adopted to fasten and shape the overlapping edges to form a stable interlocking structure, while maintaining the cylindrical shape arranged coaxially with the metal enclosed shell.

[0016] S4. After riveting, the particle capture device should be cleaned and dried. After drying, it can be taken out and cooled naturally before use.

[0017] According to the above technical solution, the step of cutting the aluminum sheet into rectangular plates and punching the mesh and fixing holes for particle capture using a punch press further includes:

[0018] Step S11: Select a high-strength aluminum alloy sheet that meets the requirements of the GIL system as raw material. The thickness of the aluminum sheet is controlled between 2mm and 3mm. Use a CNC shearing device to cut the aluminum sheet. After cutting, the edges are flat and burr-free. Then, input the program through a CNC punching machine to set the aperture and spacing of the grid mesh. The program will punch out the grid mesh for particle capture on the surface of the aluminum sheet in sequence. The openings are circular.

[0019] Step S12: According to the design drawings, determine the size and position of the fixing holes for connecting with the three-post insulator. The fixing holes are standard circular holes. Then, punch the fixing holes at the predetermined positions on the aluminum sheet.

[0020] According to the above technical solution, the step of rolling the aluminum sheet into a cylindrical shape using a rolling device, then using a custom mold to punch and bend one side of the sheet into a Z-shape and overlap it with the other side further includes:

[0021] The cut and punched aluminum sheet is placed on the worktable of the rolling equipment. The equipment is started, and the aluminum sheet is gradually bent into a cylindrical shape by the continuous rolling action of the rollers. The rolled cylinder maintains high coaxiality, with the deviation controlled within ±0.5mm. A custom mold is used to stamp one side of the aluminum sheet. The mold is shaped like a "Z". The bent edge forming the "Z" is overlapped with the flat edge of the other end of the aluminum sheet. During the overlap process, the angle and position are adjusted to ensure that the contact surfaces fit tightly for subsequent riveting. The inner surface of the bent edge is designed to have a smooth transition with a transition curvature radius ranging from 1mm to 2mm.

[0022] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: This invention, by adopting a butt-joint overlapping structure and combining it with SPR self-piercing riveting cold working process for fixation, eliminates the cumbersome traditional processes such as welding, weld grinding, polishing, secondary shaping, and rounding. This method effectively reduces the number of processes and the process cycle in the production process, reduces dust pollution generated during grinding and polishing, and avoids the problem of out-of-roundness caused by welding and thermal deformation. By reducing additional processing steps such as secondary shaping and rounding, it not only improves production efficiency but also significantly reduces the overall processing cost. It solves the technical problems of existing particle capture devices, such as numerous processes, long processing cycles, serious environmental pollution, and poor processing accuracy in structural manufacturing, thus optimizing the overall manufacturing process and cost-effectiveness. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the assembly structure of the particle capture device and its peripheral components in this invention;

[0025] Figure 2 This is a schematic diagram of the particle capture device in this invention;

[0026] Figure 3 This is a structural diagram of the connection point of the butt joint bending and overlapping structure;

[0027] Figure 4 This is a schematic diagram of the arrangement of concave holes in a butt joint bending and overlapping structure.

[0028] In the figure: 1 metal enclosed shell, 2 three-post insulator, 3 particle capture device, 4 concave and convex rivet holes, 5 grid mesh, 31 bent edge, 32 overlapping edge, S is the hole spacing after the concave holes are evenly arranged in a straight line, and α is the contact angle between the bent edge and the overlapping edge. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figure 1As shown, the structure of a particle trapping device for a GIL three-post insulator includes a metal enclosed housing 1, a three-post insulator 2, a particle trapping device 3, concave and convex rivet holes 4, and a grid mesh 5. The particle trapping device 3 is a thin-walled cylindrical structure, installed on the outer circumference of the three-post insulator 2, and in contact with the inner wall of the coaxially arranged metal enclosed housing 1 to form an equipotential grounding connection.

[0031] More specifically, such as Figure 2 and Figure 3 As shown, the outer surface of the particle capture device 3 is uniformly distributed with grid mesh 5 along the axial direction. The edges of the grid mesh 5 are smoothly transitioned. The mesh is uniformly distributed and extends axially to the bottom of the particle capture device 3, connecting with the low-voltage equipotential region. The overlap of the particle capture device 3 is a butt-edge bent overlap structure, which includes a bent edge 31 and an overlap edge 32. The bent edge 31 is a Z-shaped bent edge. The contact angle α between the bent edge 31 and the overlap edge 32 is controlled between 30° and 45°, and the inner surface of the overlap area has a rounded transition.

[0032] More specifically, such as Figure 4 As shown, the overlapping area is fixed by a rivetless SPR self-piercing riveting process, forming concave-convex rivet holes 4 after riveting. Continuous concave holes are formed on the inside of the overlapping area. The diameter of the concave hole is 3mm to 5mm and the hole depth is 1.5mm to 2mm. The concave holes are evenly arranged in a straight line with a hole spacing of S. The distance between the outer concave hole and the edge of the overlapping edge 32 is S / 2. A boss with a height not exceeding 2mm is formed on the outer surface of the overlapping area. The boss height is 1.5mm to 2mm, and the inner and outer edges of the boss are smoothly transitioned to reduce electric field distortion and improve particle capture efficiency.

[0033] The method for manufacturing a particle trapping device for a GIL three-post insulator includes the following steps:

[0034] S1. Cut the aluminum sheet into rectangular plates and use a punch press to punch the mesh 5 and fixing holes for particle capture.

[0035] S2. The aluminum sheet is rolled into a cylindrical shape using a rolling equipment. Then, a custom mold is used to punch and bend one side of the cut aluminum sheet into a Z-shape and overlap it with the other side.

[0036] S3. The rivetless SPR self-piercing riveting process is adopted to fasten and form the overlapping edge 32, forming a stable interlocking structure, while maintaining the cylindrical shape coaxially arranged with the metal closed shell.

[0037] S4. After riveting, the particle capture device should be cleaned and dried to ensure its stable shape and reliable function. The surface should be clean and free of foreign matter. After drying, remove it and allow it to cool naturally before use.

[0038] Step S1 further includes the following steps:

[0039] Step S11: Select a high-strength aluminum alloy sheet that meets the requirements of the GIL system as raw material. The thickness of the aluminum sheet is controlled between 2mm and 3mm. Use a high-precision CNC shearing equipment to cut the aluminum sheet. After cutting, the edges are flat and burr-free. Then, input the program through the CNC punching machine to set the aperture and spacing of the grid mesh. The program will punch out the grid mesh for particle capture on the surface of the aluminum sheet in sequence. The openings are circular.

[0040] Step S12: According to the design drawings, determine the size and position of the fixing hole connected to the three-post insulator 2. The fixing hole is a standard circular hole, and the fixing hole is punched out at the predetermined position of the aluminum sheet.

[0041] Specifically, step S2 further includes the following: placing the cut and punched aluminum sheet on the worktable of the rolling equipment, starting the equipment, and using the continuous rolling action of rollers to gradually bend the aluminum sheet into a cylindrical shape. The rolled cylinder maintains high coaxiality, with the deviation controlled within ±0.5mm. A custom mold is used to stamp one side of the aluminum sheet. The mold shape is a "Z" shaped structure. The "Z" shaped bent edge 31 is overlapped with the flat edge of the other end of the aluminum sheet. During the overlap process, the angle and position are adjusted to ensure a tight fit between the contact surfaces for subsequent riveting. The inner surface of the bent edge 31 is designed with a smooth transition, with a transition curvature radius ranging from 1mm to 2mm, to reduce structural fatigue caused by stress concentration during long-term operation and improve the mechanical life of the device.

[0042] In this embodiment, during operation, the mesh 5 of the particle capture device 3 captures charged particles under the influence of an electric field, and the particles gradually accumulate on the surface of the mesh 5. At this time, the stable structure of the riveting holes and bosses ensures long-term operation of the device under high-pressure conditions, eliminating the need for frequent maintenance due to particle accumulation. Simultaneously, the rounded edges of the mesh 5 prevent high electric field concentration caused by sharp edges during particle capture, further improving capture efficiency. When the device is subjected to external mechanical vibration or electric field fluctuations, the overlapping and bending structure at the butt edges maintains the overall mechanical strength and electrical connection stability of the device. Furthermore, the concave holes and bosses formed by the SPR self-piercing riveting process during riveting provide a double locking effect, effectively preventing the particle capture device from loosening due to mechanical fatigue under high-pressure operating conditions. The external design of the bosses features a highly uniform raised structure, effectively reducing local electric field distortion and further ensuring the operational stability of the GIL system.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A structure of a particle capturing device for a GIL three post insulator, comprising a metal closed shell (1), a three post insulator (2), a particle capturing device (3), a concave-convex type rivet hole (4), and a grid mesh (5), characterized in that: The micro-particle capturing device (3) is a thin-walled cylindrical structure, which is installed on the outer circumference of the three-pole insulator (2) and in contact with the inner wall of the coaxially arranged metal closed shell (1) to form an equipotential grounding conduction. The outer surface of the micro-particle capturing device (3) is uniformly distributed with grid mesh holes (5). The overlapping part of the micro-particle capturing device (3) adopts a butt joint edge bending and overlapping structure. The butt joint edge bending and overlapping structure is fixed by a rivetless SPR self-punching riveting process. The inner surface after riveting forms a continuous concave hole, the outer surface forms a boss with a height of not more than 2 mm, and the inner surface presents a smooth transition. The butt joint edge bending and overlapping structure includes a bending edge (31) and an overlapping edge (32); The edges of the grid mesh holes (5) are treated by smooth transition, and the mesh holes are uniformly distributed and penetrate through the bottom of the micro-particle capturing device (3) along the axial direction, and are in communication with the low-voltage equipotential area; The butt joint edge bending and overlapping structure includes a Z-shaped bending edge (31) formed at one end by die stamping, and a flat overlapping edge (32) at the other end. The contact angle α between the bending edge (31) and the overlapping edge (32) is controlled between 30° and 45°; The rivetless SPR self-punching riveting process forms a concave hole with a hole diameter of 3 mm to 5 mm and a hole depth of 1.5 mm to 2 mm in the overlapping area. The concave holes are uniformly arranged in a straight line with a hole spacing S, and the distance between the outer concave hole and the edge of the overlapping edge (32) is S / 2. The height of the riveting boss of the micro-particle capturing device (3) is controlled between 1.5 mm and 2 mm. The inner and outer edges of the boss are treated by smooth transition to reduce electric field distortion and improve the efficiency of capturing particles.

2. A manufacturing method of a particle capturing device for a GIL three-strut insulator, characterized by, The method comprises the following steps: S1, cut the aluminum sheet into a rectangular plate, and use a punch to complete the punching operation of the grid mesh hole for capturing particles and the fixing hole; S2, roll the aluminum sheet into a cylindrical shape by using a rolling device, and then use a customized die to stamp and bend one side of the sheet into a Z shape and overlap the other side; S3, adopt a rivetless SPR self-punching riveting process to fasten and form the overlapping edge into a stable interlocking structure, while maintaining the coaxial arrangement of the cylindrical shape with the metal closed shell; S4, after riveting, the micro-particle capturing device is cleaned and dried, then taken out and naturally cooled for use.

3. The method of manufacturing a particulate arrestor for a GIL three- post insulator according to claim 2, characterized in that: The step of cutting the aluminum sheet into a rectangular plate and using a punch to complete the punching operation of the grid mesh hole for capturing particles and the fixing hole further comprises: Step S11: select a high-strength aluminum alloy sheet that meets the requirements of the GIL system as the raw material. The thickness of the aluminum sheet is controlled between 2 mm and 3 mm. Use a numerical control shearing device to cut the aluminum sheet. The edges after cutting are smooth and free of burrs. Then input the program through a numerical control punch, set the hole diameter and hole spacing of the grid mesh hole, and set the program to punch the grid mesh hole for capturing particles on the surface of the aluminum sheet in sequence. The hole is circular in shape; Step S12: according to the design drawing, determine the size and position of the fixing hole connected with the three-pole insulator (2). The fixing hole is a standard circular hole. Then punch the fixing hole at the predetermined position of the aluminum sheet.

4. The method of manufacturing a particulate arrestor for a GIL three- post insulator according to claim 2, characterized in that: The step of rolling the aluminum sheet into a cylindrical shape by the rolling device and then stamping and bending one side of the sheet into a Z-shaped form using a customized mold and overlapping the other side further comprises: The cut and punched aluminum sheet is placed on the workbench of the rolling device, the device is started, and the aluminum sheet is gradually bent into a cylindrical shape through the continuous rolling action of the rollers. The cylindrical body after rolling has high coaxiality, with a deviation controlled within ±0.5 mm. A customized mold is used to stamp one side of the aluminum sheet, and the mold shape is a "Z"-shaped structure. The bent side (31) in the "Z"-shaped form is overlapped with the other flat side of the aluminum sheet. The angle and position are adjusted during the overlapping process, and the contact surfaces are tightly fitted for subsequent riveting process. The inner surface of the bent side (31) is designed with a smooth transition, and the transition curvature radius ranges from 1 mm to 2 mm.

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