A vacuum interrupter shield

Abstract

The utility model discloses a vacuum arc-extinguishing chamber shielding device relates to electrical shielding technical field. Vacuum arc-extinguishing chamber shielding device includes insulator, shielding net, conducting ring, the insulator is set on vacuum arc-extinguishing chamber, and has part ring and is set on the circumferential side of vacuum arc-extinguishing chamber's dynamic end conducting rod, shielding net sets up in the insulator, and the shape with the shape of insulator is set up in correspondence, conducting ring is fixedly connected with the inner wall of shielding net, and conducting ring passes through from the inner side wall of the insulator, and abuts on the metal casing of vacuum arc-extinguishing chamber dynamic end, the utility model provides vacuum arc-extinguishing chamber shielding device, and the metal casing of vacuum arc-extinguishing chamber is conducted with shielding net through conducting ring and is connected electricity, thereby realizes shielding net and vacuum arc-extinguishing chamber dynamic end keeps same potential all the time, and high electric field is transferred to the inside of insulator, and the air domain field intensity near vacuum arc-extinguishing chamber dynamic end is weakened, makes the electric field distribution near it more uniform, and the insulating property of insulator is ensured.

Description

Technical Field

[0001] This utility model relates to the field of electrical shielding technology, and in particular to a shielding device for a vacuum interrupter chamber. Background Technology

[0002] With the increasing demand for miniaturization in electrical equipment, solid-insulated switches typically use solid insulating materials such as epoxy resin to completely seal the primary circuit and vacuum interrupter. This design offers advantages such as compact structure and small size, but it also results in a confined internal space for the solid insulation components. Particularly when the moving end conductive rod of the vacuum interrupter is connected to the conductive base, bolts, and other post-assembly metal parts, the electric field distribution within the insulation component becomes extremely uneven due to the air insulation distance, the presence of metal sharp points, and the grounding of the epoxy outer surface of the insulation. This easily leads to points of high field strength concentration. When this field strength exceeds the breakdown field strength of air, it will damage the insulation performance of the product.

[0003] Furthermore, in solid-insulated switches, the ceramic body of the vacuum interrupter and the stainless steel end cap on the moving end are fixedly connected by high-temperature silver soldering, which results in defects such as sharp corners and dead angles after welding. The outer silicone rubber coating layer of the interrupter sometimes has imperfect coating process in this area, leading to poor adhesion and the presence of tiny gas gaps. These gaps can cause partial discharge problems in the product. Utility Model Content

[0004] In view of this, the purpose of this utility model is to overcome the shortcomings in related technologies, and this utility model provides a vacuum interrupter shielding device.

[0005] This utility model provides the following technical solution: A shielding device for a vacuum interrupter includes an insulator, a shielding mesh, and a conductive ring.

[0006] The insulator is sleeved on the vacuum interrupter, and a portion of it is arranged around the periphery of the moving end conductive rod of the vacuum interrupter; the shielding mesh is disposed inside the insulator, and its shape corresponds to the shape of the insulator; the conductive ring is fixedly connected to the inner wall of the shielding mesh, and the conductive ring passes through the inner wall of the insulator and abuts against the metal shell of the moving end of the vacuum interrupter; the shielding mesh is electrically connected to the metal shell of the vacuum interrupter through the conductive ring.

[0007] As a further improvement to the above technical solution, the shielding mesh includes a first shielding part and a second shielding part. The first shielding part is sleeved on the periphery of the vacuum interrupter, and the second shielding part surrounds the periphery of the moving end conductive rod of the vacuum interrupter. The inner diameter of the second shielding part is smaller than the inner diameter of the first shielding part, and the conductive ring is disposed on the step formed between the second shielding part and the first shielding part.

[0008] As a further improvement to the above technical solution, the second shielding part is horn-shaped, the end of the second shielding part that communicates with the first shielding part is a, the opening diameter of the second shielding part away from the first shielding part is b, and the outer diameter of the vacuum interrupter is c. The values ​​of a, b, and c satisfy: a < b and a < c.

[0009] As a further improvement to the above technical solution, the insulator is fitted onto the vacuum interrupter chamber by epoxy casting, and the shielding mesh is embedded in the insulator.

[0010] As a further improvement to the above technical solution, an annular blocking step is provided on the side wall of the conductive ring near the axis of the vacuum interrupter.

[0011] As a further improvement to the above technical solution, both openings of the shielding mesh are provided with bent portions that bend away from the axis of the vacuum interrupter.

[0012] As a further improvement to the above technical solution, the conductive ring is provided with an annular sealing boss on the end face near the moving end of the vacuum interrupter, and the sealing boss abuts against the rubber coating layer of the vacuum interrupter.

[0013] As a further improvement to the above technical solution, a conductive sealing ring is provided between the end face of the conductive ring near the moving end of the vacuum interrupter and the metal shell of the vacuum interrupter. The conductive sealing ring is located on the side of the sealing boss near the axis of the vacuum interrupter. The conductive ring moves closer to the metal shell of the vacuum interrupter, which can compress and deform the conductive sealing ring.

[0014] As a further improvement to the above technical solution, the conductive sealing ring is made of conductive silicone rubber material.

[0015] As a further improvement to the above technical solution, both the shielding mesh and the conductive ring are made of brass or stainless steel.

[0016] Compared with related technologies, the beneficial effects of this utility model are: The vacuum interrupter shielding device provided by this utility model requires the following steps during installation: First, the shielding mesh, fixedly connected to the conductive ring, must be fitted onto the outside of the vacuum interrupter. Simultaneously, the conductive ring must be tightly pressed against the metal shell of the vacuum interrupter to achieve a reliable conductive connection between the conductive ring and the metal shell. After the shielding mesh is in place, the insulator is then fitted. The insulator is integrally molded and completely fitted onto the outside of the vacuum interrupter. During the fitting process, it is crucial to ensure that the shielding mesh is accurately embedded within the insulator, allowing the two to tightly bond and form an organic whole. Through the conductive ring, the shielding mesh and the metal shell of the vacuum interrupter achieve an effective conductive connection.

[0017] In practical operation, this design has played a crucial role. Because the shielding mesh and the metal shell of the vacuum interrupter are electrically connected via conductive rings, the shielding mesh and the moving end of the vacuum interrupter are always at the same potential. This transfers the high electric field that might have been concentrated near the moving end of the vacuum interrupter to the shielding mesh, i.e., to the interior of the insulator. This transfer effectively weakens the air field strength near the moving end of the vacuum interrupter, avoiding various problems that could be caused by excessively high field strength. Simultaneously, it effectively shields the sharp edges and corners of the metal within the insulator's inner cavity, as well as the tiny air gaps caused by poor bonding at the welding points of the moving end of the vacuum interrupter, reducing electric field distortion. This improves the overall electric field distribution and enhances the insulation performance of the solid insulating component.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This shows a cross-sectional view of the vacuum interrupter shielding device in one embodiment of the present invention. Figure 2 It shows Figure 1 A magnified view of point A in the middle; Figure 3 A partial schematic diagram of a vacuum interrupter shielding device according to another embodiment of the present invention is shown.

[0021] Explanation of key component symbols: 100-Vacuum interrupter; 110-Moving end conductive rod; 120-Metal shell; 130-Coating layer; 140-Guide sleeve; 141-Protective shell; 200-Insulator; 300-Shielding mesh; 310-First shielding part; 320-Second shielding part; 330-Bending part; 400-Conductive ring; 410-Barrier step; 420-Sealing boss; 500-Conductive sealing ring; 510-Conductive spring. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] like Figure 1 As shown, an embodiment of this utility model provides a vacuum interrupter shielding device, including an insulator 200, a shielding mesh 300, and a conductive ring 400.

[0028] The insulator 200 is sleeved on the vacuum interrupter 100, and a portion of it is arranged around the periphery of the moving end conductive rod 110 of the vacuum interrupter 100. The shielding mesh 300 is disposed inside the insulator 200, and its shape corresponds to that of the insulator 200. The conductive ring 400 is fixedly connected to the inner wall of the shielding mesh 300 by welding or other means. The conductive ring 400 passes through the inner wall of the insulator 200 and abuts against the metal shell 120 of the moving end of the vacuum interrupter 100. The shielding mesh 300 is electrically connected to the metal shell 120 of the vacuum interrupter 100 through the conductive ring 400.

[0029] In this embodiment, the vacuum interrupter shielding device, during installation, firstly, the shielding mesh 300, fixedly connected to the conductive ring 400, is fitted onto the outside of the vacuum interrupter 100. Simultaneously, the conductive ring 400 must abut against the metal shell 120 of the vacuum interrupter 100, thereby achieving a reliable conductive connection between the conductive ring 400 and the metal shell 120. After the shielding mesh 300 is in place, the insulator 200 is then fitted. The insulator 200 is integrally molded and completely fitted onto the outside of the vacuum interrupter 100. During the fitting process, it is ensured that the shielding mesh 300 is accurately embedded within the insulator 200, so that the two are tightly combined to form an organic whole. Through the conductive ring 400, the shielding mesh 300 and the metal shell 120 of the vacuum interrupter 100 achieve an effective conductive connection.

[0030] In practical operation, this design plays a crucial role. Because the shielding mesh 300 and the metal shell 120 of the vacuum interrupter 100 are electrically connected via the conductive ring 400, the shielding mesh 300 and the moving end of the vacuum interrupter 100 are always at the same potential. As a result, the high electric field that might have been concentrated near the moving end of the vacuum interrupter 100 is transferred to the shielding mesh 300, that is, to the interior of the insulator 200. This transfer of electric field effectively weakens the air field strength near the moving end of the vacuum interrupter 100, avoiding various problems that might be caused by excessively high field strength. Simultaneously, it effectively shields the sharp edges and corners of the metal within the cavity of the insulator 200, and also shields the tiny air gaps caused by poor bonding at the welding points of the moving end of the vacuum interrupter 100, reducing electric field distortion. This improves the overall electric field distribution and enhances the insulation performance of the solid insulator.

[0031] In some specific embodiments, the shielding mesh 300 includes a first shielding part 310 and a second shielding part 320. The first shielding part 310 is sleeved on the periphery of the vacuum interrupter 100, and the second shielding part 320 surrounds the periphery of the moving end conductive rod 110 of the vacuum interrupter 100. The inner diameter of the second shielding part 320 is smaller than the inner diameter of the first shielding part 310. The conductive ring 400 is disposed on the step formed between the second shielding part 320 and the first shielding part 310. Specifically, when the shielding mesh 300 is installed, the shielding mesh 300 with the conductive ring 400 installed is positioned and fixed by snapping with the lower core of the mold and the blocking step 410, making the installation process more convenient and accurate.

[0032] Meanwhile, this design ensures that the conductive ring 400 can reliably abut against the metal casing 120 on the outside of the moving end of the vacuum interrupter 100. Reliable contact of the conductive ring 400 is a crucial prerequisite for achieving a conductive connection between the shielding mesh 300 and the metal casing 120. Only when the conductive ring 400 and the metal casing 120 are in close contact can current be smoothly conducted between them, thus maintaining the same potential between the shielding mesh 300 and the metal casing 120. This not only ensures the accuracy of the shielding mesh 300's installation position, avoiding problems such as poor shielding effect due to installation deviations, but also ensures a reliable conductive connection between the shielding mesh 300 and the metal casing 120, providing a strong guarantee for the vacuum interrupter 100 to achieve good electric field shielding and stable electrical performance during operation.

[0033] In some specific embodiments, the second shielding part 320 is horn-shaped, the end of the second shielding part 320 communicating with the first shielding part 310 is 'a', the opening diameter of the second shielding part 320 away from the first shielding part 310 is 'b', and the outer diameter of the vacuum interrupter 100 is 'c'. The values ​​of a, b, and c satisfy: a < b, and a < c. Through the above-mentioned size restrictions, while ensuring that the shielding mesh 300 is stably installed on the vacuum interrupter 100, the horn-shaped opening of the second shielding part 320 has many advantages. On the one hand, it facilitates other components to approach and operate the moving end conductive rod 110 on the vacuum interrupter 100 within the second shielding part 320. In the actual installation and maintenance of electrical systems, it is often necessary to inspect, repair, or connect other lines to the moving end conductive rod 110 of the vacuum interrupter 100. The horn-shaped opening provides more space and a more convenient path for these operations. On the other hand, during the operation of the vacuum interrupter 100, the uniformity of the electric field distribution is crucial to its performance and reliability. Uneven electric field distribution can lead to excessively high local electric field strength, causing phenomena such as arc discharge, which can damage the vacuum interrupter 100 and other related components. The horn-shaped design of the second shielding part 320 effectively regulates the electric field distribution, making it more uniformly distributed within the second shielding part 320. This ensures the reliability of the vacuum interrupter 100, extends its service life, and improves the stability and safety of the entire electrical system.

[0034] In some specific embodiments, the insulator 200 is fitted onto the vacuum interrupter 100 via epoxy casting. Epoxy casting is a mature and efficient insulation process. During operation, epoxy resin and other insulating materials are first mixed according to a specific formula and ratio to ensure good insulation performance, mechanical strength, and heat resistance. Then, the mixed epoxy resin is injected into a pre-designed mold. During casting, parameters such as casting speed, pressure, and temperature must be strictly controlled to ensure the epoxy resin evenly fills every corner of the mold, avoiding defects such as air bubbles and voids, thereby guaranteeing the quality of the insulator 200. Through this epoxy casting method, the insulator 200 can form an organic whole with the vacuum interrupter 100, tightly wrapping the outside of the vacuum interrupter 100 and providing reliable insulation protection. The shielding mesh 300 is embedded within the insulator 200; this embedded structure has several advantages. On the one hand, the shielding mesh 300 can guide the electric field, rationally distributing and channeling the high electric field around the vacuum interrupter 100, reducing the occurrence of excessively high local electric field strength, thereby reducing the risk of electrical faults such as corona discharge and arc flashover. On the other hand, since the shielding mesh 300 is embedded in the insulator 200, the insulator 200 can effectively fix and protect the shielding mesh 300, preventing problems such as loosening, deformation, or displacement during use, and ensuring that the shielding mesh 300 can always stably perform its electric field shielding function.

[0035] By using the epoxy casting method described above, the insulator 200 is fitted onto the vacuum interrupter 100, and the shielding mesh 300 is embedded within the insulator 200. This structural design and installation process ensures that the insulation protection provided by the insulator 200 to the vacuum interrupter 100 and the shielding mesh 300 is more stable and reliable. During normal operation of the vacuum interrupter 100, whether under high voltage and high current conditions or during frequent switching operations, the insulator 200 maintains excellent insulation performance, effectively isolating the vacuum interrupter 100 from the external environment and other live components, preventing accidents such as leakage and short circuits. Simultaneously, the tight connection between the shielding mesh 300 and the insulator 200 ensures the uniformity and stability of the electric field distribution, further improving the electrical performance and reliability of the vacuum interrupter 100, extending its service life, and providing strong support for the safe and stable operation of the power system.

[0036] In some specific embodiments, the conductive ring 400 has an annular blocking step 410 extending from its side wall near the axis of the vacuum interrupter 100. When the insulator 200 is manufactured using a casting process, specific insulating materials (such as epoxy resin) need to be injected into the corresponding mold to encapsulate the vacuum interrupter 100 and other components, thereby forming an insulator 200 with insulating protection function. However, during the casting process, due to the material's own fluidity and gravity, splashing and flowing may occur. If not controlled, these materials are very likely to fall onto the metal shell 120 of the vacuum interrupter 100.

[0037] The annular barrier step 410 extending from the conductive ring 400 plays a crucial barrier role during the casting process of the insulator 200. During the casting process, a sealing ring is installed between the lower core of the mold and the bottom surface of the barrier step 410, which seals the epoxy material and prevents it from overflowing. The matching inner diameter of the lower core and the barrier step 410 also serves a positioning function, ensuring the proper placement of the shielding mesh 300 and the conductive ring 400 within the insulator 200.

[0038] In some specific embodiments, both openings of the shielding mesh 300 are provided with bent portions 330 that curve away from the axis of the vacuum interrupter 100. From the perspective of electric field distribution, a complex electric field is generated around the vacuum interrupter 100 during operation. One of the main functions of the shielding mesh 300 is to uniformly distribute the electric field and avoid excessively high local electric field strength. The bent portions 330 at the openings of the shielding mesh 300 play an important auxiliary role in this process. When an electric field acts on the shielding mesh 300, the special shape of the bent portions 330 can change the propagation path and distribution state of the electric field. It can make the electric field lines transition more smoothly when passing through the bent portions 330, reducing the abrupt changes and concentration of the electric field at the openings. In this way, the bent portions 330 can further improve the uniformity of the field strength distribution, making the electric field around the vacuum interrupter 100 more stable and balanced.

[0039] like Figure 2 As shown, in some specific embodiments, the conductive ring 400 has an annular sealing boss 420 on its end face near the moving end of the vacuum interrupter 100. During installation, the sealing boss 420 tightly abuts against the rubber coating layer 130 of the vacuum interrupter 100. The rubber coating layer 130 is an important component of the vacuum interrupter 100, serving not only as insulation protection but also as a buffer against external mechanical impacts to a certain extent. The contact between the sealing boss 420 and the rubber coating layer 130 forms a sealing barrier, providing a fundamental guarantee for the subsequent insulator 200 casting process.

[0040] When casting the insulator 200, a specific insulating material (such as epoxy resin) needs to be injected into the mold to encapsulate components such as the vacuum interrupter 100 and the conductive ring 400, forming the insulator 200 with insulating and fixing functions. However, during the casting process, due to its own fluidity and gravity, the insulating material may flow or seep through, posing a risk of exceeding the adhesive layer 130 of the vacuum interrupter 100.

[0041] If insulating material spills over the rubber coating layer 130 and lands on the metal casing 120, it will cause a series of serious problems. The metal casing 120 is an important component of the vacuum interrupter 100, and it needs to maintain a good conductive connection with the conductive ring 400 to ensure smooth current flow. However, the adhesion of insulating material will cause the conductive connection between the conductive sealing ring 500 and the metal casing 120 to fail, meaning that the shielding mesh 300 and the moving end of the interrupter cannot achieve equipotentiality.

[0042] The sealing boss 420 on the conductive ring 400 plays a crucial sealing and blocking role during the casting process of the insulator 200. It effectively prevents the flow and penetration of insulating material, preventing it from crossing the rubber coating layer 130 of the vacuum interrupter 100 and falling onto the metal casing 120. In this way, the sealing boss 420 ensures the reliability of the conductive connection between the conductive ring 400 and the metal casing 120, allowing for stable and efficient current transmission between them. Simultaneously, it provides a good foundation for the conductive connection between the shielding mesh 300 and the metal casing 120, as the shielding mesh 300 needs to be electrically connected to the metal casing 120 through the conductive ring 400 to perform its function of shielding the electric field and uniformly distributing the electric field.

[0043] In some specific embodiments, at least two sealing bosses 420 are concentrically arranged along the radial direction of the vacuum interrupter chamber 100 to further improve its sealing and isolation effect on insulating materials.

[0044] In some specific embodiments, a conductive sealing ring 500 is provided between the end face of the conductive ring 400 near the moving end of the vacuum interrupter 100 and the metal shell 120 of the vacuum interrupter 100. The conductive sealing ring 500 is located on the side of the sealing boss 420 near the axis of the vacuum interrupter 100. When an installation operation is performed, and the conductive ring 400 moves closer to the metal shell 120 of the vacuum interrupter 100, the conductive sealing ring 500 will be compressed and deformed due to the pressure between the conductive ring 400 and the metal shell 120. The conductive sealing ring 500 is usually made of a material with certain elasticity and conductivity, which can produce elastic deformation under pressure without affecting its conductivity. The conductive sealing ring 500 can be a conductive silicone rubber ring with a rectangular or O-shaped cross-section.

[0045] As the conductive sealing ring 500 deforms, it gradually moves closer to the guide sleeve 140 at the moving end of the vacuum interrupter 100. The guide sleeve 140 plays a crucial role in guiding the movement of the moving contact within the vacuum interrupter 100. It is equipped with a metal protective shell 141 on its outer side, which not only protects the guide sleeve 140 but also participates in the electrical connection of the entire vacuum interrupter 100. During the continuous compression and deformation process, the conductive sealing ring 500 eventually abuts against the metal protective shell 141 outside the guide sleeve 140.

[0046] This contact design has several important implications. First, it ensures the reliability of the conductive connection between the conductive ring 400 and the metal housing 120 and protective shell 141. In electrical systems, a stable conductive connection is crucial for ensuring normal current transmission. If the conductive connection is unreliable, problems such as increased contact resistance and localized overheating may occur, thereby affecting the performance and service life of the entire vacuum interrupter 100. The conductive sealing ring 500, through compression deformation, abuts against the metal protective shell 141, forming a tight electrical connection point, which effectively reduces contact resistance and ensures smooth current transmission between the conductive ring 400, the metal housing 120, and the protective shell 141.

[0047] Secondly, this design ensures that the shielding mesh 300 is equipotentially connected with the metal casing 120 and the protective shell 141. The shielding mesh 300 plays a crucial role in the vacuum interrupter 100 by uniformizing the electric field and preventing corona discharge and local breakdown. For the shielding mesh 300 to function properly, it must be equipotentially connected with surrounding metal components (such as the metal casing 120 and the protective shell 141). The reliable conductive connection established through the conductive sealing ring 500 enables the shielding mesh 300 to achieve equipotential connection with the metal casing 120 and the protective shell 141, thereby creating a stable electric field environment around the vacuum interrupter 100. This ensures that the shielding mesh 300 effectively performs its shielding and uniform electric field functions, guaranteeing the safe and stable operation of the vacuum interrupter 100 under various operating conditions.

[0048] In some specific embodiments, the conductive sealing ring 500 is made of conductive silicone rubber material. From a conductivity perspective, the conductive silicone rubber material is not ordinary silicone rubber; it incorporates appropriate amounts of conductive fillers, such as carbon black, metal powders (silver powder, copper powder, etc.), or conductive fibers into the silicone rubber matrix, giving the originally insulating silicone rubber good conductivity. This conductivity meets the current transmission requirements between the conductive ring 400 and components such as the metal housing 120 and the outer metal protective shell 141 of the guide sleeve 140. During the operation of the vacuum interrupter 100, current needs to flow smoothly between various conductive components to ensure the normal operation of the arc-extinguishing function. The conductive sealing ring 500 made of conductive silicone rubber material provides a stable conductive path, effectively reducing contact resistance, minimizing heat generated due to excessive resistance, and preventing equipment failures caused by localized overheating, thereby ensuring the stable electrical performance of the vacuum interrupter 100.

[0049] From a mechanical performance perspective, silicone rubber inherently possesses excellent elasticity and flexibility. When the conductive ring 400 approaches the metal housing 120 of the vacuum interrupter 100, the conductive sealing ring 500 is compressed and deformed. The conductive silicone rubber material adapts well to this pressure change, exhibiting elastic deformation under compression and rapidly returning to its original shape after the pressure is released. This excellent elasticity ensures that the conductive sealing ring 500 maintains tight contact with the metal housing 120 and the metal protective shell 141 under various installation and usage conditions, guaranteeing the reliability of the conductive connection. Even when the vacuum interrupter 100 is subjected to external forces such as vibration or impact, the conductive sealing ring 500 can mitigate the impact on the conductive connection through its elastic buffering, preventing loosening or disconnection.

[0050] Furthermore, conductive silicone rubber materials also possess excellent corrosion resistance and aging resistance. Vacuum interrupters 100 typically operate in complex environments, potentially subject to corrosion from various chemicals and the influence of environmental factors such as temperature and humidity. Ordinary materials are prone to corrosion and aging in such environments, affecting their conductivity and service life. However, conductive silicone rubber materials resist the erosion of various chemicals, maintain stable performance over a wide temperature range, and are less prone to aging and deterioration. This allows the conductive sealing ring 500 to maintain excellent conductivity and mechanical properties throughout long-term use.

[0051] like Figure 3 As shown, in some specific embodiments, the conductive sealing ring 500 can employ multiple conductive springs 510. From a conductivity perspective, the conductive springs 510 are typically made of metal materials with good conductivity, such as copper alloys or stainless steel. These metal materials themselves have low resistivity, ensuring minimal current loss when current passes through the conductive springs 510. Once the conductive ring 400 and the metal housing 120 are connected through multiple conductive springs 510, current can be smoothly transmitted along the path formed by these conductive springs 510. Furthermore, the parallel connection of multiple conductive springs 510 further reduces the overall contact resistance. Because in a parallel circuit, the reciprocal of the total resistance is equal to the sum of the reciprocals of the individual resistances, the parallel connection of multiple conductive springs 510 is equivalent to increasing the cross-sectional area of ​​the conductive path, thereby effectively reducing energy loss during current transmission and ensuring efficient conductivity between the conductive ring 400 and the metal housing 120, meeting the current transmission requirements of the vacuum interrupter 100 during normal operation.

[0052] In terms of mechanical properties, the conductive spring 510 possesses unique elastic characteristics. During installation, when the conductive ring 400 approaches the metal housing 120, the conductive spring 510 is compressed. Due to its excellent elasticity, it can undergo elastic deformation within a certain range and automatically adjust its compression degree according to the distance between the conductive ring 400 and the metal housing 120. This adaptive elastic deformation capability allows the conductive spring 510 to maintain pressure on both the conductive ring 400 and the metal housing 120, thus ensuring a tight contact between them. Even when the vacuum interrupter 100 is subjected to external forces such as vibration and impact, the elasticity of the conductive spring 510 can act as a buffer and shock absorber. It can absorb and disperse the energy generated by external forces, preventing the connection between the conductive ring 400 and the metal housing 120 from loosening or breaking due to external forces, and always maintaining a stable conductive connection.

[0053] From the perspective of ease of installation and maintenance, using multiple conductive springs 510 as conductive sealing rings 500 also has significant advantages. The conductive springs 510 have a relatively simple structure and small size, allowing them to be easily placed at predetermined positions between the conductive ring 400 and the metal housing 120 during installation. Furthermore, due to their elasticity, precise control of the distance between the conductive ring 400 and the metal housing 120 is not required during installation; it is sufficient to ensure that the conductive springs 510 can be reasonably compressed, greatly reducing the difficulty and precision requirements of installation.

[0054] In some specific embodiments, the shielding mesh 300 and the conductive ring 400 are both made of brass or stainless steel; from an electrical performance perspective, both brass and stainless steel possess good conductivity. Brass is an alloy composed of copper and zinc, and its conductivity is relatively excellent, meeting the basic requirements for current transmission in the vacuum interrupter 100. During the operation of the vacuum interrupter 100, current needs to flow smoothly between various components to achieve normal opening and closing operations. The shielding mesh 300 requires a uniform electric field to prevent local electric field concentration from causing corona discharge and breakdown, and good conductivity ensures that the shielding mesh 300 can effectively distribute the charge evenly, playing a role in stabilizing the electric field. The conductivity of brass reduces energy loss and heat generation when current passes through the conductive ring 400.

[0055] Stainless steel also possesses good electrical conductivity. Although its conductivity is slightly lower than that of materials like pure copper, it is an ideal choice for applications where conductivity requirements are not extremely stringent and other properties are more important. Furthermore, stainless steel contains elements such as chromium and nickel, which form a dense oxide film. This oxide film has extremely high resistance, preventing current from passing through it under normal operating conditions, reducing leakage current, and further improving the stability of electrical performance.

[0056] In terms of mechanical properties, both brass and stainless steel perform well. Brass has good strength and hardness, and can withstand certain mechanical stress and impact.

[0057] Stainless steel has superior mechanical properties, possessing high strength, hardness, and toughness.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A shielding device for a vacuum interrupter chamber, characterized in that, include: An insulator (200) is sleeved on a vacuum interrupter (100) and has a portion surrounding the moving end conductive rod (110) of the vacuum interrupter (100). A shielding mesh (300) is disposed within the insulator (200) and its shape corresponds to the shape of the insulator (200); A conductive ring (400) is fixedly connected to the inner wall of the shielding mesh (300). The conductive ring (400) passes through the inner wall of the insulator (200) and abuts against the metal shell (120) at the moving end of the vacuum interrupter (100). The shielding mesh (300) is electrically connected to the metal shell (120) of the vacuum interrupter (100) through the conductive ring (400).

2. The vacuum interrupter shielding device according to claim 1, characterized in that, The shielding mesh (300) includes a first shielding part (310) and a second shielding part (320). The first shielding part (310) is sleeved on the periphery of the vacuum interrupter (100), and the second shielding part (320) surrounds the periphery of the moving end conductive rod (110) of the vacuum interrupter (100). The inner diameter of the second shielding part (320) is smaller than the inner diameter of the first shielding part (310). The conductive ring (400) is disposed on the step formed between the second shielding part (320) and the first shielding part (310).

3. The vacuum interrupter shielding device according to claim 2, characterized in that, The second shielding part (320) is horn-shaped. The end of the second shielding part (320) that communicates with the first shielding part (310) is a. The opening diameter of the second shielding part (320) away from the first shielding part (310) is b. The outer diameter of the vacuum interrupter (100) is c. The values ​​of a, b, and c satisfy: a < b and a < c.

4. The vacuum interrupter shielding device according to claim 2, characterized in that, The insulator (200) is fitted onto the vacuum interrupter (100) by epoxy casting, and the shielding mesh (300) is embedded in the insulator (200).

5. The vacuum interrupter shielding device according to claim 4, characterized in that, The conductive ring (400) has an annular blocking step (410) extending on the side wall near the axis of the vacuum interrupter (100).

6. The vacuum interrupter shielding device according to claim 4, characterized in that, Both openings of the shielding mesh (300) are provided with bent portions (330) that bend away from the axis of the vacuum interrupter (100).

7. The vacuum interrupter shielding device according to claim 4, characterized in that, The conductive ring (400) has an annular sealing boss (420) on the end face near the moving end of the vacuum interrupter (100), and the sealing boss (420) abuts against the rubber coating layer (130) of the vacuum interrupter (100).

8. The vacuum interrupter shielding device according to claim 7, characterized in that, A conductive sealing ring (500) is provided between the end face of the conductive ring (400) near the moving end of the vacuum interrupter (100) and the metal shell (120) of the vacuum interrupter (100). The conductive sealing ring (500) is located on the side of the sealing boss (420) near the axis of the vacuum interrupter (100). The conductive ring (400) moves closer to the metal shell (120) of the vacuum interrupter (100) and can compress and deform the conductive sealing ring (500).

9. The vacuum interrupter shielding device according to claim 8, characterized in that, The conductive sealing ring (500) is made of conductive silicone rubber material.

10. The vacuum interrupter shielding device according to any one of claims 1 to 9, characterized in that, Both the shielding mesh (300) and the conductive ring (400) are made of brass or stainless steel.

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