CN119909847A - Structure and manufacturing method of a particle capture device for GIL three-pillar insulator - Google Patents
Structure and manufacturing method of a particle capture device for GIL three-pillar insulator Download PDFInfo
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Abstract
本发明涉及输配电设备制造技术领域，尤其涉及一种GIL三支柱绝缘子用微粒捕捉装置的结构及其制造方法，包括金属封闭壳体、三支柱绝缘子、微粒捕捉装置、格栅网孔，以及通过无铆钉SPR自冲铆接工艺固定后形成的凹凸型铆孔，所述微粒捕捉装置为薄壁圆柱形结构，安装于三支柱绝缘子的外圆周，与同轴布置的金属封闭壳体的内壁接触形成等电位接地导通，微粒捕捉装置的外表面沿轴向均匀分布有格栅网孔，格栅网孔的边缘经过圆滑过渡处理，网孔均匀分布沿轴向贯穿至微粒捕捉装置的底部，并与低压等电位区域连通，在运行过程中，微粒捕捉装置的格栅网孔在电场作用下捕捉带电微粒，最终可提高微粒捕捉效率。
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, comprising a metal closed shell, a three-pillar insulator, a particle capture device, a grid mesh, and a concave-convex rivet hole formed after being fixed by a rivet-free SPR self-piercing riveting process. 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 grid meshes along the axial direction, the edges of the grid meshes are subjected to a smooth transition treatment, the meshes are evenly distributed along the axial direction to the bottom of the particle capture device, and are connected to a low-voltage equipotential area. During operation, the grid meshes of the particle capture device capture charged particles under the action of an electric field, and ultimately the particle capture efficiency can be improved.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution equipment manufacturing, in particular to a structure of a particle capturing device for a GIL three-post insulator and a manufacturing method thereof.
Background
The gas insulated power transmission line (Gas Insulated Transmission Line, GIL) technology is an important core technology in the field of high-voltage power transmission and distribution, has the advantages of high capacity, low loss, zero magnetic leakage, suitability for long-distance power transmission and the like, and is widely applied to urban power grids, underground power transmission and trans-regional power transmission projects. In the GIL system, the three-post insulator is used as a key component, bears the mechanical supporting and electrical insulation effects of the high-voltage conductor, and is one of core components for guaranteeing the stable operation of the system.
However, floating charged metal particles are generated in the GIL chamber during operation due to a high voltage electric field, vibration, or residual impurities in the production process, etc. The existence of the particles in the gas insulation space threatens the three-post insulator, namely, when the charged particles are attached to the surface of the insulator or a high-voltage conductor, local electric field distortion is easy to be caused, so that the flashover phenomenon of the insulating surface occurs, when the charged particles are serious, local discharge or insulation breakdown is possibly caused, and secondly, the charged particles are accumulated for a long time under the action of the high-voltage electric field, so that the surface structure of the insulator is damaged, the mechanical strength of the three-post insulator is finally reduced, and even serious safety accidents such as cracking or bursting occur.
To solve the above-mentioned problems, a particle catch device is often installed in the prior art at or near the outer circumference of the three-post insulator to catch floating charged metal particles. However, the devices still have a plurality of defects in practical application, namely, firstly, partial particle capturing devices are simple in design and limited in capturing efficiency, in addition, the capturing devices are usually fixed through welding or bolting, the connecting modes are easy to loosen or deform due to long-term vibration or expansion and contraction, the stable operation of the devices is influenced, secondly, the traditional welding and fixing modes are required to undergo a plurality of procedures such as welding, welding seam polishing and polishing, the manufacturing cost is high, the problem of welding thermal deformation exists, and the installation precision and consistency of the devices are reduced. In summary, in order to ensure stable operation of the three-post insulator, the present invention provides a highly efficient and reliable particle capturing device for capturing floating charged metal particles in the circumferential direction of the three-post insulator. The device has the characteristics of structural optimization, stable installation, high capturing efficiency, simplified manufacturing process and convenient maintenance, thereby comprehensively improving the operation safety and stability of the GIL system.
Disclosure of Invention
The present invention is directed to a particle trap structure for GIL three-post insulator and a method for manufacturing the same, which solve the above-mentioned problems.
In order to solve the technical problems, the invention provides the following technical scheme:
The particle capturing device comprises a metal closed shell, three post insulators, particle capturing devices, concave-convex rivet holes and grid meshes, wherein the particle capturing devices are of a thin-wall cylindrical structure, are arranged on the outer circumference of the three post insulators, are contacted with the inner wall of the coaxially arranged metal closed shell to form equipotential grounding conduction, the grid meshes are uniformly distributed on the outer surface of the particle capturing devices, the lap joint of the particle capturing devices adopts a butt joint edge folding lap joint structure, the butt joint edge folding lap joint structure is fixed through a rivetless SPR self-piercing riveting process, continuous concave holes are formed on the inner side surface after riveting, a boss with the height of not more than 2mm is formed on the outer side surface, the inner side surface presents smooth transition, and the butt joint edge folding lap joint structure comprises a folding edge and a lap joint edge.
According to the technical scheme, the edges of the mesh holes of the grid are subjected to smooth transition treatment, and the mesh holes are uniformly distributed and axially penetrate to the bottom of the particle capturing device and are communicated with the low-voltage equipotential region.
According to the technical scheme, the butt-joint edge bending lap joint structure comprises a Z-shaped bending edge formed by stamping one end through a die and a flat lap joint edge at the other end, and the contact angle alpha between the bending edge and the lap joint edge is controlled to be between 30 degrees and 45 degrees.
According to the technical scheme, the diameter of the orifice of the concave hole formed in the lap joint area by the rivet-free SPR self-piercing riveting process is 3mm to 5mm, the hole depth is 1.5mm to 2mm, the concave holes are uniformly arranged into a straight line, the hole spacing is S, and the edge distance between the outer concave hole and the lap joint edge is S/2.
According to the technical scheme, the height of the riveting boss of the particle capturing device is controlled to be 1.5mm to 2mm, and the inner and outer edges of the boss are subjected to smooth transition treatment so as to reduce electric field distortion and improve particle capturing efficiency.
According to the technical scheme, the manufacturing method of the particle capturing device for the GIL three-post insulator comprises the following steps of:
S1, cutting an aluminum thin plate into a rectangular plate, and finishing punching operation of mesh holes and fixing holes of a grid for capturing particles by using a punch;
S2, rolling the aluminum sheet into a cylinder shape through a rolling device, and stamping and bending one side of the sheet into a Z shape by using a custom mold and overlapping the other side of the sheet;
S3, adopting a rivetless SPR self-piercing riveting process to fasten and shape the joint edges to form a stable interlocking structure, and simultaneously maintaining a cylindrical form coaxially arranged with the metal enclosed shell;
and S4, cleaning and drying the riveted particle capturing device, taking out after drying, and naturally cooling for use.
According to the above technical solution, the step of cutting the aluminum sheet into rectangular plates and finishing the punching operation of the mesh and the fixing holes of the grid for capturing particles by using a punch press further comprises:
s11, selecting a high-strength aluminum alloy sheet meeting the requirements of a GIL system as a raw material, controlling the thickness of the aluminum sheet to be between 2mm and 3mm, cutting the aluminum sheet by using numerical control cutting equipment, enabling the edge of the cut aluminum sheet to be smooth and burr-free, inputting a program by a numerical control punch, setting the aperture and the pitch of grid meshes, sequentially punching the grid meshes for capturing particles on the surface of the aluminum sheet by the set program, and enabling the apertures to be round;
And S12, determining the size and the position of a fixing hole connected with the three-post insulator according to a design drawing, wherein the fixing hole is a standard circular hole, and then punching the fixing hole at a preset position of the aluminum sheet.
According to the above technical solution, the step of rolling the aluminum sheet into a cylindrical shape by a rolling device, and then stamping and bending one side of the sheet into a zigzag shape by using a custom mold, and overlapping the other side of the sheet further comprises:
The method comprises the steps of placing the cut and punched aluminum thin plate on a workbench of a rolling device, starting the device, enabling the aluminum thin plate to be gradually bent to form a cylinder through continuous rolling action of rollers, enabling the cylinder body after rolling to keep high coaxiality, controlling deviation within +/-0.5 mm, stamping one side of the aluminum thin plate by using a custom die, overlapping the bent edge forming the Z shape with the other flat edge of the aluminum thin plate by using the die with a Z-shaped structure, adjusting angles and positions in the overlapping process, tightly attaching contact surfaces so as to enable the contact surfaces to be in a follow-up riveting process, enabling the inner surface of the bent edge to be designed to be in smooth transition, and enabling the transition curvature radius range to be 1mm to 2mm.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the butt joint structure is adopted, and the SPR self-piercing riveting cold processing technology is combined for fixing, so that the traditional complicated procedures of welding, welding seam grinding, polishing, secondary shaping, rounding and the like are abandoned, the number of procedures and the technological period in the production process are effectively reduced, dust pollution in the grinding and polishing process is reduced, the problem of rounding caused by welding and thermal deformation is avoided, the production efficiency is improved, the overall processing cost is obviously reduced, the technical problems of multiple procedures, long processing period, serious environmental pollution, poor processing precision and the like in the structure manufacturing of the conventional particle capturing device are solved, and the overall manufacturing flow and the cost benefit are optimized.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of an assembly structure of a particle trap device and its peripheral components according to the present invention;
FIG. 2 is a schematic view of a particle trap according to the present invention;
FIG. 3 is a schematic view of the structure of the junction of the butt edge fold lap joint structure;
FIG. 4 is a schematic view of the arrangement of the concave holes in the butt edge fold and overlap structure.
In the figure, a metal closed shell, a three-post insulator, a particle capturing device, concave-convex rivet holes, a grid mesh, a 31 bent edge, a 32 joint edge, wherein S is the hole spacing after concave holes are uniformly arranged into a straight line, and alpha is the contact angle between the bent edge and the joint edge.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the structure of the particle catch device for the GIL three-pillar insulator comprises a metal closed shell 1, a three-pillar insulator 2, a particle catch device 3, concave-convex rivet holes 4 and grid meshes 5, wherein the particle catch device 3 is of a thin-wall cylindrical structure, is arranged on the outer circumference of the three-pillar insulator 2, and is contacted with the inner wall of the coaxially arranged metal closed shell 1to form equipotential ground connection conduction.
More specifically, as shown in fig. 2 and 3, the outer surface of the particle catch arrangement 3 is uniformly distributed with grid mesh 5 in the axial direction, the edge of the grid mesh 5 is smoothly transited, the mesh is evenly distributed and axially penetrated to the bottom of the particle catch device 3, and is communicated with the low-voltage equipotential region, the lap joint of the particle capturing device 3 is a butt-joint edge bending lap joint structure, the butt-joint edge bending lap joint structure comprises a bending edge 31 and a lap joint edge 32, and the bending edge 31 is a Z-shaped bending edge. The contact angle alpha between the folded edge 31 and the overlap edge 32 is controlled between 30 DEG and 45 DEG, and the inner side surface of the overlap region is in the shape of a circular arc.
More specifically, as shown in fig. 4, the overlap region is fixed by a rivetless SPR self-piercing riveting process, concave-convex rivet holes 4 are formed after riveting, continuous concave holes are formed on the inner side of the overlap region, the hole diameters of the concave holes are 3mm to 5mm, the hole depths are 1.5mm to 2mm, the concave holes are uniformly arranged into a straight line, the hole spacing is S, the edge distance between the outer concave holes and the overlap edge 32 is S/2, a boss with the height not exceeding 2mm is formed on the outer surface of the overlap region, the boss height is 1.5mm to 2mm, and the inner and outer edges of the boss are subjected to smooth transition treatment to reduce electric field distortion and improve particle capturing efficiency.
The manufacturing method of the particle capturing device for the GIL three-post insulator comprises the following steps:
s1, cutting an aluminum thin plate into rectangular plates, and punching the mesh 5 of the grid for capturing particles and the fixing holes by using a punch.
S2, rolling the aluminum sheet into a cylinder shape through a rolling device, and stamping and bending one side of the cut aluminum sheet into a Z shape by using a custom mold and overlapping the other side of the cut aluminum sheet.
S3, fastening and forming the joint edge 32 by adopting a rivetless SPR self-piercing riveting process to form a stable interlocking structure, and simultaneously maintaining a cylindrical form coaxially arranged with the metal enclosed shell.
S4, cleaning and drying the riveted particle capturing device to ensure stable form and reliable function. Clean surface, no foreign matter residue, drying, taking out, and naturally cooling.
The step S1 further comprises the steps of:
S11, selecting a high-strength aluminum alloy sheet meeting the requirements of a GIL system as a raw material, controlling the thickness of the aluminum sheet to be between 2mm and 3mm, cutting the aluminum sheet by using high-precision numerical control cutting equipment, enabling the edge of the cut aluminum sheet to be smooth and burr-free, inputting a program through a numerical control punch, setting the aperture and the pitch of grid meshes, sequentially punching the grid meshes for capturing particles on the surface of the aluminum sheet by the set program, and enabling the apertures to be round;
and S12, determining the size and the position of a fixing hole connected with the three-post insulator 2 according to a design drawing, wherein the fixing hole is a standard circular hole, and punching the fixing hole at a preset position of the aluminum sheet.
Specifically, the step S2 further comprises the steps of placing the cut and punched aluminum sheet on a workbench of a rolling device, starting the device, and gradually bending the aluminum sheet into a cylinder shape through continuous rolling action of rollers. The cylinder body after the rolling maintains high coaxiality, the deviation is controlled within +/-0.5 mm, one side of the aluminum sheet is punched by using a custom die, the die is in a Z-shaped structure, and the bent edge 31 forming the Z shape is lapped with the other flat edge of the aluminum sheet. The angle and the position are adjusted in the lapping process, the contact surface is tightly attached to facilitate the subsequent riveting process, the inner surface of the bending edge 31 is designed to be in smooth transition, and the transition curvature radius range is 1mm to 2mm, so that structural fatigue caused by stress concentration in long-term operation is reduced, and the mechanical life of the device is prolonged.
In this embodiment, during operation of the apparatus, the grid mesh 5 of the particle catch device 3 catches charged particles under the action of an electric field, and the particles gradually accumulate on the surface of the grid mesh 5. At this time, the stable structure of the riveting hole and the boss can ensure that the device runs for a long time in a high-pressure environment without frequent maintenance due to particle accumulation, and meanwhile, the edge of the grid mesh 5 is designed in a smooth transition manner, so that high electric field concentration caused by sharp edges of the structure in the capturing process of particles can be avoided, and the capturing efficiency is further improved. When the device is subjected to external mechanical shock or electric field fluctuation, the butt edge bending and lapping structure can maintain the integral mechanical strength and the electrical connection stability of the device. Meanwhile, in the riveting process, the concave holes and the lug bosses formed through the SPR self-piercing riveting process provide double locking effects, so that the particle capturing device can be effectively prevented from loosening due to mechanical fatigue in a high-pressure operation environment, the outer part of the lug boss is designed into a highly uniform convex structure, the distortion of a local electric field is effectively reduced, and the operation stability of a GIL system is further ensured.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited thereto, but may be modified or substituted for some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
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