Structure of particle capturing device for GIL three-post insulator and manufacturing method of particle capturing device

Abstract

The invention relates to the technical field of manufacturing of power transmission and distribution equipment, in particular to a structure of a particle capturing device for a GIL three-post insulator and a manufacturing method of the particle capturing device, and the particle capturing device comprises a metal closed shell, the three-post insulator, the particle capturing device, grating meshes and concave-convex rivet holes formed after being fixed through a rivet-free SPR self-piercing riveting process. The particle capturing device is of a thin-wall cylindrical structure, is installed on the outer circumference of the three-post insulator and makes contact with the inner wall of the coaxially-arranged metal closed shell to form equipotential grounding conduction, grating meshes are evenly distributed in the outer surface of the particle capturing device in the axial direction, and the edges of the grating meshes are subjected to smooth transition treatment. The mesh holes are evenly distributed, penetrate to the bottom of the particle capturing device in the axial direction and are communicated with a low-voltage equipotential area, in the operation process, the grid mesh holes of the particle capturing device capture charged particles under the action of an electric field, and finally the particle capturing efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission and distribution equipment manufacturing, and in particular to a structure of a particle capture device for a GIL three-pillar insulator and a manufacturing method thereof. Background Art

[0002] Gas Insulated Transmission Line (GIL) technology is an important core technology in the field of high-voltage power transmission and distribution. It has the advantages of large capacity, low loss, "zero" magnetic leakage, and adaptability to long-distance power transmission. It is widely used in urban power grids, underground power transmission, and cross-regional power transmission projects. In the GIL system, the three-pillar insulator is a key component that bears the mechanical support and electrical insulation of the high-voltage conductor and is one of the core components to ensure the stable operation of the system.

[0003] However, during the operation of the GIL gas chamber, floating charged metal particles will be generated due to high voltage electric field, vibration or residual impurities in the production process. The presence of these particles in the gas insulation space poses a threat to the three-pillar insulator: first, when the charged particles adhere to the surface of the insulator or the high voltage conductor, it is easy to cause local electric field distortion, resulting in flashover on the insulation surface; in severe cases, it may cause local discharge or insulation breakdown; secondly, the charged particles accumulate for a long time under the action of the high voltage electric field, which will damage the surface structure of the insulator, and finally lead to a decrease in the mechanical strength of the three-pillar insulator, and even serious safety accidents such as rupture or explosion.

[0004] In order to solve the above problems, in the prior art, a particle capture device is often installed on the outer circumference or nearby area of ​​the three-pillar insulator to capture floating charged metal particles. However, these devices still have many shortcomings in practical applications: first, some particle capture devices are simple in design and have limited capture efficiency, and the capture devices are often fixed by welding or bolting. These connection methods are prone to loosening or deformation due to long-term vibration or thermal expansion and contraction, affecting the stable operation of the device. Secondly, the traditional welding fixation method requires multiple processes such as welding, weld grinding, and polishing, which has a high manufacturing cost and there is a problem of welding thermal deformation, which reduces the installation accuracy and consistency of the device. In summary, in order to ensure the stable operation of the three-pillar insulator, the present invention designs an efficient and reliable particle capture device to capture floating charged metal particles in the circumferential direction of the three-pillar insulator. The device has the characteristics of optimized structure, stable installation, high capture efficiency, simplified manufacturing process and convenient maintenance, thereby comprehensively improving the operating safety and stability of the GIL system. Summary of the invention

[0005] The object of the present invention is to provide a structure of a particle capture device for a GIL three-pillar insulator and a manufacturing method thereof to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: The invention discloses a structure of a particle capture device for a GIL three-pillar insulator, comprising a metal closed shell, a three-pillar insulator, a particle capture device, concave-convex rivet holes, and grille meshes. The particle capture device is a thin-walled cylindrical structure, which is installed on the outer circumference of the three-pillar insulator and contacts the inner wall of the coaxially arranged metal closed shell to form an equipotential grounding conduction. The outer surface of the particle capture device is evenly distributed with grille meshes. The overlap of the particle capture device adopts a butt-edge bending overlap structure, which is fixed by a rivet-free SPR self-piercing riveting process. After riveting, a continuous concave hole is formed on the inner surface, and a boss with a height not exceeding 2 mm is formed on the outer surface, and the inner surface presents a smooth transition. The butt-edge bending overlap structure includes a bending edge and an overlap edge.

[0007] According to the above technical solution, the edges of the grid meshes are processed with smooth transition, the meshes are evenly distributed along the axial direction to the bottom of the particle capture device, and are connected to the low-voltage equipotential area.

[0008] According to the above technical solution, the butt-joint edge bending and overlapping structure includes a Z-shaped bending edge formed by mold stamping at one end and a flat overlapping edge at the other end, and the contact angle α between the bending edge and the overlapping edge is controlled between 30° and 45°.

[0009] According to the above technical solution, the diameter of the concave holes formed in the overlapping area by the rivet-free 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 holes and the edge of the overlapping edge is S / 2.

[0010] According to the above technical solution, the height of the riveted boss of the particle capture device is controlled at 1.5 mm to 2 mm, and the inner and outer edges of the boss are processed with smooth transition to reduce electric field distortion and improve particle capture efficiency.

[0011] According to the above technical solution, the manufacturing method of the particle capture device for GIL three-pillar insulator comprises the following steps: S1. Cutting the aluminum sheet into rectangular plates and punching the grid mesh and fixing holes for particle capture using a punching machine; S2, roll the aluminum sheet into a cylindrical shape using a rolling device, and then use a customized mold to punch and bend one side of the sheet into a Z shape and overlap it with the other side; S3, using rivet-free SPR self-piercing riveting technology to fasten the overlapped edges to form a stable interlocking structure while maintaining a cylindrical shape coaxially arranged with the metal enclosure; S4. After riveting, the particle capture device is cleaned and dried, taken out after drying, and can be used after natural cooling.

[0012] According to the above technical solution, the step of cutting the aluminum sheet into a rectangular plate and using a punching machine to punch the mesh and fixing holes of the particle capture grid further includes: Step S11: Select a high-strength aluminum alloy sheet that meets the requirements of the GIL system as a raw material, the thickness of the aluminum sheet is controlled between 2 mm and 3 mm, and the aluminum sheet is cut using a CNC shearing device. After cutting, the edge is flat and burr-free. Then, a program is input through a CNC punch press to set the aperture and hole spacing of the grid mesh. The program is set to punch out grid meshes for particle capture on the surface of the aluminum sheet in sequence, and the hole openings are circular; Step S12: According to the design drawings, determine the size and position of the fixing hole connected to the three-pillar insulator, the fixing hole is a standard circular hole, and then punch out the fixing hole at a predetermined position of the aluminum sheet.

[0013] According to the above technical solution, the step of rolling the aluminum sheet into a cylindrical shape by a rolling device, and then using a customized mold to stamp and bend one side of the sheet into a Z shape and overlap it with the other side further includes: Place the cut and punched aluminum sheet on the workbench of the rolling equipment, start the equipment, and gradually bend the aluminum sheet into a cylindrical shape through the continuous rolling action of the roller. The cylinder after rolling maintains high coaxiality, and the deviation is controlled within ±0.5mm. Use a customized mold to stamp one side of the aluminum sheet. The mold shape is a "Z"-shaped structure. The "Z"-shaped bent edge is overlapped with the other flat edge of the aluminum sheet. During the overlap process, the angle and position are adjusted, and the contact surface is tightly fitted for subsequent riveting process. The inner surface of the bent edge is designed to be a smooth transition, and the transition curvature radius ranges from 1mm to 2mm.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention adopts a butt-jointed edge overlap structure and combines it with the SPR self-piercing riveting cold processing process for fixation. Through this process improvement, the traditional cumbersome processes such as welding, weld grinding, polishing, secondary shaping and rounding are abandoned. This method effectively reduces the number of processes and process cycles in the production process, reduces the dust pollution generated during the grinding and polishing process, 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, not only the production efficiency is improved, but also the overall processing cost is significantly reduced. The technical problems of the existing particle capture device in structural manufacturing, such as numerous processes, long processing cycle, serious environmental pollution and poor processing accuracy, are solved, and the overall manufacturing process and cost-effectiveness are optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the assembly structure of the particle capture device and its peripheral components in the present invention; Figure 2 It is a schematic diagram of the structure of the particle capturing device in the present invention; Figure 3 It is a structural schematic diagram of the connection of the butt-edge bending and lap joint structure; Figure 4 It is a schematic diagram of the arrangement of concave holes in the butt-edge bending overlap structure.

[0016] In the figure: 1 metal closed shell, 2 three-pillar insulator, 3 particle capture device, 4 concave and convex rivet holes, 5 grid mesh, 31 bending 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 bending edge and the overlapping edge. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, the structure of a particle capture device for a GIL three-pillar insulator includes a metal closed shell 1, a three-pillar insulator 2, a particle capture device 3, concave-convex rivet holes 4, and a grid mesh 5. The particle capture device 3 is a thin-walled cylindrical structure, which is installed on the outer circumference of the three-pillar insulator 2 and contacts the inner wall of the coaxially arranged metal closed shell 1 to form an equipotential grounding conduction.

[0019] More specifically, Figure 2 and Figure 3 As shown, the outer surface of the particle capture device 3 is evenly distributed with grid meshes 5 along the axial direction, the edges of the grid meshes 5 are processed with smooth transition, the meshes are evenly distributed along the axial direction to the bottom of the particle capture device 3, and are connected with the low-voltage equipotential area, the overlap of the particle capture device 3 is a butt-joint bending overlap structure, the butt-joint bending overlap structure includes a bending edge 31 and an overlap edge 32, and the bending edge 31 is a Z-shaped bending edge. The contact angle α between the bending edge 31 and the overlap edge 32 is controlled between 30° and 45°, and the inner surface of the overlap area is an arc-shaped transition.

[0020] More specifically, Figure 4As shown, the overlapping area is fixed by a rivet-free SPR self-piercing riveting process, and a concave-convex rivet hole 4 is formed after riveting, and a continuous concave hole is formed on the inside of the overlapping area. The hole diameter of the concave hole is 3mm to 5mm, the hole depth is 1.5mm to 2mm, and the concave holes are evenly arranged in a straight line. The hole spacing is S, and the edge distance between the outer concave holes and 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, and the boss height is 1.5mm to 2mm. The inner and outer edges of the boss are subjected to a smooth transition treatment to reduce electric field distortion and improve particle capture efficiency.

[0021] The manufacturing method of the particle capture device for a GIL three-pillar insulator comprises the following steps: S1. Cut the aluminum sheet into rectangular plates, and use a punching machine to punch the particle capturing grid mesh 5 and the fixing holes.

[0022] S2. Roll the aluminum sheet into a cylindrical shape using a rolling device, and then use a customized mold to stamp and bend one side of the cut aluminum sheet into a Z shape and overlap it with the other side.

[0023] S3. The rivet-free SPR self-piercing riveting process is used to fasten and shape the overlap edge 32 to form a stable interlocking structure while maintaining a cylindrical shape coaxially arranged with the metal closed shell.

[0024] S4. After riveting, the particle capture device is cleaned and dried to ensure its stable shape and reliable function. The surface is clean and free of foreign matter. After drying, take it out and let it cool naturally before use.

[0025] The step S1 further comprises the following steps: Step S11: Select a high-strength aluminum alloy sheet that meets the requirements of the GIL system as a raw material, the thickness of the aluminum sheet is controlled between 2 mm and 3 mm, and use a high-precision CNC shearing device to cut the aluminum sheet. After cutting, the edge is flat and burr-free. Then, a program is input through a CNC punch press to set the aperture and hole spacing of the grid mesh. The program is set to punch out grid meshes for particle capture on the surface of the aluminum sheet in sequence, and the hole openings are circular; Step S12: According to the design drawings, the size and position of the fixing hole connected to the three-pillar insulator 2 are determined. The fixing hole is a standard circular hole, and the fixing hole is punched out at a predetermined position of the aluminum sheet.

[0026] Specifically, step S2 further includes the following contents: placing the cut and punched aluminum sheet on the workbench of the rolling equipment, starting the equipment, and gradually bending the aluminum sheet into a cylindrical shape through the continuous rolling action of the roller. The cylinder after rolling maintains high coaxiality, and the deviation is controlled within ±0.5mm. A customized mold is used to stamp one side of the aluminum sheet. The mold shape is a "Z"-shaped structure, and the "Z"-shaped bending edge 31 is overlapped with the flat edge of the other end of the aluminum sheet. During the overlapping process, the angle and position are adjusted, and the contact surface is closely fitted for the subsequent riveting process. The inner surface of the bending edge 31 is designed to be a smooth transition, and the transition curvature radius ranges from 1mm to 2mm, so as to reduce the structural fatigue caused by stress concentration during long-term operation and improve the mechanical life of the device.

[0027] In this embodiment, during the operation of the device, the grid mesh 5 of the particle capture device 3 captures charged particles under the action of the electric field, and the particles gradually accumulate on the surface of the grid mesh 5. At this time, the stable structure of the riveted holes and the bosses can ensure that the device can operate for a long time under a high-voltage environment without frequent maintenance due to the accumulation of particles. At the same time, the edges of the grid mesh 5 are designed with a smooth transition to avoid the formation of high electric field concentration due to the sharp edges of the structure during the capture process, further improving the capture efficiency. When the device is subjected to external mechanical vibration or electric field fluctuations, the bending and overlapping structure of the butt edge can maintain the overall mechanical strength and electrical connection stability of the device. At the same time, during the riveting process, the concave holes and bosses formed by the SPR self-piercing riveting process provide a double locking effect, which can effectively prevent the particle capture device from loosening due to mechanical fatigue under a high-voltage operating environment. The outer design of the boss is a highly uniform convex structure, which effectively reduces local electric field distortion and further ensures the operational stability of the GIL system.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A structure of a particle capture device for a GIL three-pillar insulator, comprising a metal closed shell (1), a three-pillar insulator (2), a particle capture device (3), concave-convex rivet holes (4), and grid mesh (5), characterized in that: The particle capture device (3) is a thin-walled cylindrical structure, which is installed on the outer circumference of the three-pillar insulator (2) and contacts the inner wall of the coaxially arranged metal closed shell (1) to form an equipotential grounding conduction. The outer surface of the particle capture device (3) is evenly distributed with grid mesh holes (5). The overlapping part of the particle capture device (3) adopts a butt-jointed edge bending overlap structure. The butt-jointed edge bending overlap structure is fixed by a rivet-free SPR self-piercing riveting process. After riveting, the inner surface forms a continuous concave hole, and the outer surface forms a boss with a height not exceeding 2 mm, and the inner surface presents a smooth transition. The butt-jointed edge bending overlap structure includes a bending edge (31) and an overlap edge (32).

2. The structure of a particle capture device for a GIL three-post insulator according to claim 1, characterized in that: The edges of the grid meshes (5) are processed with a smooth transition, and the meshes are evenly distributed and penetrate axially to the bottom of the particle capture device (3), and are connected to the low-voltage equipotential area.

3. The structure of a particle capture device for a GIL three-post insulator according to claim 1, characterized in that: The butt-joint edge bending and overlapping structure comprises a Z-shaped bending edge (31) formed by die stamping at one end, and a flat overlapping edge (32) at the other end, and a contact angle α between the bending edge (31) and the overlapping edge (32) is controlled to be between 30° and 45°.

4. The structure of a particle capture device for a GIL three-post insulator according to claim 1, characterized in that: The concave holes formed in the overlapped area by the rivet-free SPR self-piercing riveting process have an opening diameter of 3 mm to 5 mm, a hole depth of 1.5 mm to 2 mm, and the concave holes are evenly arranged in a straight line, with a hole spacing of S, and the distance between the outer concave holes and the edge of the overlapped edge (32) is S / 2.

5. The structure of a particle capture device for a GIL three-post insulator according to claim 4, characterized in that: The height of the riveted boss of the particle capturing device (3) is controlled to be between 1.5 mm and 2 mm, and the inner and outer edges of the boss are subjected to a smooth transition process to reduce electric field distortion and improve particle capturing efficiency.

6. A method for manufacturing a particle capture device for a GIL triple-pillar insulator, characterized in that: The following steps are involved: S1. Cutting the aluminum sheet into rectangular plates and punching the grid mesh and fixing holes for particle capture using a punching machine; S2, roll the aluminum sheet into a cylindrical shape through a rolling device, and then use a customized mold to punch and bend one side of the sheet into a Z shape and overlap it with the other side; S3, using rivet-free SPR self-piercing riveting technology to fasten the overlapped edges to form a stable interlocking structure while maintaining a cylindrical shape coaxially arranged with the metal enclosure; S4. After riveting, the particle capture device is cleaned and dried, taken out after drying, and can be used after natural cooling.

7. The method for manufacturing a particle capture device for a GIL three-post insulator according to claim 6, characterized in that: The step of cutting the aluminum sheet into rectangular plates and punching the mesh holes and fixing holes of the particle capture grid using a punch press further comprises: Step S11: Select a high-strength aluminum alloy sheet that meets the requirements of the GIL system as a raw material, the thickness of the aluminum sheet is controlled between 2 mm and 3 mm, and the aluminum sheet is cut using a CNC shearing device. After cutting, the edge is flat and burr-free. Then, a program is input through a CNC punch press to set the aperture and hole spacing of the grid mesh. The program is set to punch out grid meshes for particle capture on the surface of the aluminum sheet in sequence, and the hole openings are circular; Step S12: According to the design drawing, the size and position of the fixing hole connected to the three-pillar insulator (2) are determined, the fixing hole being a standard circular hole, and then the fixing hole is punched out at a predetermined position of the aluminum sheet.

8. The method for manufacturing a particle capture device for a GIL three-post insulator according to claim 6, characterized in that: The step of rolling the aluminum sheet into a cylindrical shape by a rolling device, and then using a customized mold to punch and bend one side of the sheet into a Z-shape and overlap it with the other side further includes: The aluminum sheet that has been cut and punched is placed on the workbench of the rolling equipment, and the equipment is started. The aluminum sheet is gradually bent into a cylindrical shape through the continuous rolling action of the roller. The cylindrical body after rolling maintains high coaxiality, and the deviation is controlled within ±0.5mm. A customized mold is used to stamp one side of the aluminum sheet. The mold shape is a "Z"-shaped structure. The "Z"-shaped bending edge (31) is overlapped with the other end of the flat edge of the aluminum sheet. The angle and position are adjusted during the overlap process. The contact surface is closely fitted to facilitate the subsequent riveting process. The inner surface of the bending edge (31) is designed to be a smooth transition, and the transition curvature radius ranges from 1mm to 2mm.

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