Grounding switch and switch equipment

Abstract

The utility model belongs to the technical field of electrical equipment, and discloses a grounding switch and switch equipment, the grounding switch comprises a housing, a moving side part, a static side part and a driving mechanism, the moving side part comprises a cylinder and a moving contact arranged on the cylinder; a piston is arranged in the air cylinder and fixedly connected with the shell. An air hole is formed in the end part of the moving contact and is communicated with the inner cavity of the cylinder; the driving mechanism is used for driving the cylinder and the moving contact to move synchronously. When the driving mechanism drives the air cylinder and the moving contact to move in the direction away from the static side part to realize opening of the grounding switch, the space of the inner cavity of the end part of the air cylinder is gradually reduced, the insulating gas is compressed to increase the air pressure in the air cylinder, and the insulating gas in the air cylinder is jetted out through the air hole under the action of high pressure and quickly blown to the root part of an electric arc. Therefore, the arc generated between the contacts is extinguished, the arc extinguishing performance is improved, the grounding switch obtains shorter arcing time, the contacts are prevented from being ablated, and it is ensured that the grounding switch can meet the high-parameter induced current opening and closing test requirement.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a grounding switch and switching device. Background Technology

[0002] Gas-insulated metal-enclosed switchgear (GIS) includes circuit breakers, disconnectors, grounding switches, instrument transformers, surge arresters, busbars, connectors, and outgoing terminals. All these devices or components are enclosed in a grounded metal casing filled with a pressurized insulating gas, such as SF6 or a mixture of SF6 and N2. In the grounding switch, the moving contact slides within its holder to contact or separate from the stationary contact. An electric arc is generated at the moment of separation between the moving and stationary contacts. Currently, in fast-connecting grounding switch structures using SF6 or a mixture of SF6 and N2 as the insulating / arc-extinguishing medium, the performance requirements for type testing are largely achieved through the combined effect of the moving contact's high opening and closing speed, erosion resistance, and the excellent arc-extinguishing capability of the insulating gas. To meet high-parameter induced current opening and closing tests, or to replace the gas with a weaker arc-extinguishing gas, the arc-extinguishing speed and effect are poor, leading to contact erosion and damage, making it difficult to complete high-parameter tests.

[0003] Therefore, there is an urgent need for a grounding switch and switching device to solve the above-mentioned problems in the existing technology. Utility Model Content

[0004] The purpose of this utility model is to provide a grounding switch and switching device that can quickly extinguish the electric arc generated between the stationary contact and the moving contact, improve the arc extinguishing capability, prevent the electric arc from burning the stationary contact and the moving contact, and ensure that it can meet the requirements of high-parameter induced current opening and closing tests.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] On the one hand, a grounding switch is provided, including a housing, a stationary side portion, a moving side portion, and a drive mechanism;

[0007] The moving side portion includes a cylinder and a moving contact disposed on the cylinder; a piston is disposed inside the cylinder and the piston is fixedly connected to the housing; an air hole is disposed at the end of the moving contact and the air hole communicates with the inner cavity of the cylinder;

[0008] The drive mechanism is used to drive the cylinder and the moving contact to move synchronously relative to the piston, and the moving contact contacts or separates from the stationary side under the drive of the drive mechanism.

[0009] As an optional solution for the grounding switch provided by this utility model, the cylinder has a connecting hole at the end where the moving contact is located, and the air hole is connected to the inner cavity of the cylinder through the connecting hole.

[0010] As an optional solution for the grounding switch provided by this utility model, the cylinder includes a sliding cylinder, one end of the sliding cylinder is open, and the other end is provided with an end plate. The connecting hole is provided on the end plate. The piston extends out of the cylinder through the opening and is fixedly connected to the housing. The inner wall of the sliding cylinder is sealed to the piston and in sliding contact.

[0011] The moving contact includes a contact portion and a fixing portion connected together. The contact portion can contact the stationary side portion, and the fixing portion is fixedly connected to the end plate.

[0012] And / or, the piston includes a conductive rod, a first end of which is connected to the housing, and a second end of which is provided with a piston portion, the piston portion being sealed and slidingly engaged with the cylinder.

[0013] As an optional solution to the grounding switch provided by this utility model, the grounding switch further includes a grounding insulator. The housing is provided with a first mounting hole, and the grounding insulator is at least partially embedded in the first mounting hole and connected to the housing. The grounding insulator is provided with a second mounting hole, and the piston is fixedly inserted through the second mounting hole.

[0014] As an optional solution for the grounding switch provided by this utility model, the grounding insulator includes a positioning cylinder, a first flange portion and a limiting portion connected in sequence, and the second mounting hole passes through the positioning cylinder, the first flange portion and the limiting portion;

[0015] The positioning cylinder passes through the first mounting hole, the first flange abuts against the outer wall of the housing and is connected to the housing by a fastener, the inner ring of the limiting part is provided with a limiting groove, the outer circumference of the piston is provided with a limiting protrusion, and the limiting protrusion is engaged in the limiting groove.

[0016] As an optional solution for the grounding switch provided by this utility model, the driving mechanism includes a driving rod, a connecting plate, and an insulating plate;

[0017] The housing is provided with a first through hole, the drive rod is movably passed through the first through hole, one end of the drive rod extending into the housing is connected to the insulating plate through the connecting plate, and the insulating plate is connected to the cylinder;

[0018] And / or, one of the housing and the drive mechanism is provided with a guide rod, and the other is provided with a guide hole, wherein the guide rod is slidably engaged with the guide hole along the moving direction of the moving contact.

[0019] As an optional solution for the grounding switch provided by this utility model, the stationary side portion includes a stationary side shield, a stationary contact, and an arc-blocking cover;

[0020] The stationary side shield is provided with a mounting cavity and a second through hole communicating with the mounting cavity, and the stationary contact is installed in the mounting cavity;

[0021] The arc-blocking cover is connected to the static side shield, and the arc-blocking cover encloses an arc-blocking cavity that is directly opposite the second through hole;

[0022] The moving contact can pass through the arc-isolating cavity and the second through hole into the mounting cavity, and is plugged into the stationary contact. As an optional solution for the grounding switch provided by this utility model, the outer periphery of the arc-isolating cover is provided with a second flange portion, and the second flange portion is fixedly connected to the stationary side shielding cover;

[0023] And / or, the cross-sectional area of ​​the arc-isolating cavity gradually increases along the direction closer to the moving side portion.

[0024] As an optional solution for the grounding switch provided by this utility model, the stationary contact includes a stationary main contact and a stationary arc contact. The stationary main contact is provided with an inner through hole, and the stationary arc contact passes through the inner through hole and is spaced apart from the hole wall of the inner through hole.

[0025] The moving contact can be inserted between the stationary arc contact and the stationary main contact, and is electrically connected to the stationary arc contact through the air hole. The outer wall of the moving contact is in conductive contact with the stationary main contact.

[0026] On the other hand, a switching device is provided, including a circuit breaker, a disconnecting switch, a linkage mechanism, and a grounding switch as described above, wherein the linkage mechanism connects the circuit breaker, the disconnecting switch, and the grounding switch.

[0027] The beneficial effects of this utility model are:

[0028] This utility model provides a grounding switch and a switching device including the grounding switch. During use, the moving and stationary contacts of the grounding switch are in an environment filled with insulating gas. The moving contact is mounted on a cylinder, and an air hole communicating with the cylinder's inner cavity is provided on the moving contact. A piston that slides within the cylinder is also provided, forming a gas chamber between the piston's end face and the cylinder. When the drive mechanism moves the cylinder and moving contact relative to the piston, closer to the stationary side, during the closing process of the grounding switch, the increase in the gas chamber space creates a negative pressure inside the gas chamber. Under this negative pressure, a large amount of insulating gas is drawn into the gas chamber. As the drive mechanism moves the cylinder and moving contact away from the stationary side to open the grounding switch, the space of the gas chamber gradually shrinks. The insulating gas is compressed, causing the gas pressure inside the gas chamber to rise. Under high pressure, the insulating gas inside the gas chamber can be ejected through the air hole and quickly blown towards the root of the arc to extinguish the arc generated between the moving and stationary contacts. This improves the arc extinguishing performance of the grounding switch, allows the grounding switch to obtain a shorter arc burning time, avoids arc erosion of the stationary and moving contacts, and ensures that the grounding switch can meet the requirements of high-parameter induced current opening and closing tests.

[0029] Moreover, since the drive mechanism in the grounding switch can drive the cylinder to move relative to the piston, the internal cavity space at the end of the cylinder can be variable. This part of the internal cavity is connected to the air hole of the moving contact, which simplifies the structure and effectively shortens the path of the insulating gas when it is injected from the cylinder. This helps to increase the speed of gas injection, thereby accelerating the arc extinguishing speed and improving the arc extinguishing performance. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0031] Figure 1 This is a first isometric view of the grounding switch provided in a specific embodiment of this utility model;

[0032] Figure 2 This is a first cross-sectional view (open state) of the grounding switch provided in a specific embodiment of this utility model;

[0033] Figure 3 This is a second cross-sectional view (closed state) of the grounding switch provided in a specific embodiment of this utility model;

[0034] Figure 4 This is a cross-sectional view of the grounding insulator provided in a specific embodiment of this utility model;

[0035] Figure 5 This is a second isometric view of the grounding switch provided in a specific embodiment of this utility model;

[0036] Figure 6 This is a cross-sectional view of the stationary side shield and stationary contact of the grounding switch provided in a specific embodiment of this utility model.

[0037] In the picture:

[0038] 10. Stationary side; 20. Moving side;

[0039] 1. Piston; 3. Stationary side shield; 4. Stationary contact; 5. Arc blocking cover; 6. Housing; 7. Grounding insulator; 8. Drive mechanism; 9. Guide rod;

[0040] 11. Conductive rod; 12. Piston part; 13. Guide ring; 14. Spring contact finger;

[0041] 111. Limiting protrusion;

[0042] 21. Cylinder; 22. Moving contact; 210. Gas chamber;

[0043] 211. Sliding cylinder; 212. End plate; 213. Connecting block; 2121. Connecting hole;

[0044] 220. Vent; 221. Contact part; 222. Fixing part;

[0045] 31. Mounting cavity; 32. Second through hole;

[0046] 51. Arc-blocking cavity; 52. Second flange portion;

[0047] 41. Stationary main contact; 42. Stationary arc contact; 411. Internal perforation; 412. Elastic element;

[0048] 61. First mounting hole; 62. First through hole;

[0049] 70. Second mounting hole; 71. Positioning cylinder; 72. First flange; 73. Limiting part;

[0050] 731. Limiting groove;

[0051] 81. Drive rod; 82. Connecting plate; 83. Insulating plate;

[0052] 820. Guide hole; 821. First plate; 822. Second plate; 823. Reinforcing plate. Detailed Implementation

[0053] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0054] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 based on the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0057] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0058] In the embodiments of this utility model, the same reference numerals denote the same parts, and for the sake of brevity, detailed descriptions of the same parts are omitted in different embodiments.

[0059] like Figure 1 , Figure 2 as well as Figure 3 As shown, this embodiment provides a grounding switch, including a housing 6, a moving side portion 20, a stationary side portion 10, and a driving mechanism 8. The moving side portion 20 includes a cylinder 21 and a moving contact 22 disposed on the cylinder 21. A piston 1 is disposed inside the cylinder 21 and is fixedly connected to the housing 6. The inner wall of the cylinder 21 is sealed and slidably fitted with the piston 1. An air hole 220 is provided at the end of the moving contact 22, communicating with the inner cavity of the cylinder 21. The driving mechanism 8 is connected to the cylinder 21 and is used to drive the cylinder 21 and the moving contact 22 to move synchronously relative to the piston 1. Under the drive of the driving mechanism 8, the moving contact 22 contacts or separates from the stationary side portion 10. Specifically, the stationary side portion 10 includes a stationary side shield 3 and a stationary contact 4 disposed within the stationary side shield 3. The stationary contact 4 is used for separable contact with the moving contact 22.

[0060] In use, the grounding switch provided in this embodiment has its moving contact 22 and stationary contact 4 in an environment filled with insulating gas. The moving contact 22 is mounted on a cylinder 21, and a vent 220 communicating with the inner cavity of the cylinder 21 is provided on the moving contact 22. A piston 1, which slides within the cylinder 21, is also provided, forming a gas chamber 210 between the end face of the piston 1 and the cylinder 21. When the driving mechanism 8 drives the cylinder 21 and the moving contact 22 to move relative to the piston 1 and approach the stationary side 10, during the closing process of the grounding switch, the increase in the space of the gas chamber 210 creates a negative pressure inside. Under this negative pressure, a large amount of insulating gas is drawn into the gas chamber 210. As the drive mechanism 8 drives the cylinder 21 and the moving contact 22 to move away from the stationary side 10 to open the grounding switch, the space of the gas chamber 210 gradually shrinks. The insulating gas is compressed, causing the gas pressure inside the gas chamber 210 to rise. Under high pressure, the insulating gas inside the gas chamber 210 can be ejected through the air hole 220 and quickly blown towards the root of the arc to extinguish the arc generated between the moving contact 22 and the stationary contact 4, improve the arc extinguishing performance of the grounding switch, enable the grounding switch to obtain a shorter arc burning time, avoid the arc burning of the stationary contact 4 and the moving contact 22, and ensure that the grounding switch can meet the requirements of high-parameter induced current opening and closing tests.

[0061] Moreover, since the drive mechanism 8 in the grounding switch can drive the cylinder 21 to move relative to the piston 1, the internal cavity space at the end of the cylinder 21 is variable. This part of the internal cavity is connected to the air hole 220 of the moving contact 22, which simplifies the structure and effectively shortens the path of the insulating gas when it is injected from the cylinder 21. This helps to increase the speed of gas injection, thereby accelerating the arc extinguishing speed and improving the arc extinguishing performance.

[0062] In this embodiment, see Figure 2 and Figure 3The cylinder 21 has a connecting hole 2121 at the end where the moving contact 22 is located, and the air hole 220 is connected to the inner cavity of the cylinder 21 through the connecting hole 2121. That is, the moving contact 22 is located at one end of the cylinder 21 and is in separable contact with the stationary contact 4, and the air hole 220 is directly opposite to and connected to the connecting hole 2121. By setting the moving contact 22 at the end of the cylinder 21 and connecting the cylinder 21 with the interior of the moving contact 22, it is easy to achieve the engagement of the moving contact 22 and the stationary contact 4, and ensure that the insulating gas is ejected from the end of the cylinder 21 toward the stationary side portion 10. The structural layout is more reasonable and the arc extinguishing effect is better.

[0063] In this embodiment, the cylinder 21 and the moving contact 22 can be separately manufactured and then assembled together to form a movable part that is movable relative to the piston 1, which is more convenient to manufacture and can improve production speed. Of course, in other embodiments, the cylinder 21 and the moving contact 22 can also be manufactured into an integral structure, with a chamber for sliding through the piston 1 and an air hole 220 for jetting inside.

[0064] Furthermore, the cylinder 21 includes a sliding cylinder 211 with a smooth inner circumferential wall. One end of the sliding cylinder 211 is open, and the other end is provided with an end plate 212. A connecting hole 2121 is provided on the end plate 212. The inner wall of the sliding cylinder 211 is sealed to and in sliding contact with the piston 1. The piston 1 extends out of the cylinder 21 through the opening at one end of the sliding cylinder 211 and is fixedly connected to the housing 6. (Refer to...) Figure 2 In the orientation of the cylinder 21, the left end face of piston 1 and the inner wall of the left end of cylinder 21 form a gas chamber 210. The insulating gas in this gas chamber 210 can only enter and exit through the air hole 220. The chamber formed by the right end face of piston 1 and the inner wall of the right end of cylinder 21 is independent of the gas chamber 210 on the left. The moving contact 22 includes a contact part 221 and a fixing part 222 connected together. The air hole 220 is disposed through the contact part 221 and the fixing part 222, and the fixing part 222 is arranged around the outer periphery of the contact part 221. The contact part 221 can contact or separate from the stationary contact 4 to realize the opening and closing of the grounding switch. The fixing part 222 is fixedly connected to the end plate 212 to realize the fixed connection between the moving contact 22 and the cylinder 21.

[0065] For example, screws or bolts can be used to connect the fixing part 222 and the end plate 212 of the cylinder 21.

[0066] For example, the moving contact 22 is made of copper, with a copper-tungsten top that is resistant to ablation.

[0067] See Figure 2 and Figure 3The piston 1 includes a conductive rod 11, the first end of which is connected to the housing 6, and the second end of which is provided with a piston portion 12. The piston portion 12 is sealed and slidably engaged with the sliding cylinder 211 of the cylinder 21. A gas chamber 210 is formed between the end face of the piston 1 and the inner wall of the cylinder 21. When the moving contact 22 approaches or moves away from the stationary contact 4, the sliding cylinder 211 and the piston 1 are slidably engaged, thereby increasing or decreasing the space of the gas chamber 210 to draw in insulating gas or to eject insulating gas through the vent 220.

[0068] See Figure 2 The piston 1 has a first groove and a second groove along its circumferential ring. A guide ring 13 is disposed in the first groove, and a spring contact finger 14 is disposed in the second groove. During the sliding process of the cylinder 21, the guide ring 13 is sealed and in sliding contact with the inner wall of the sliding cylinder 211. The guide ring 13 is made of polytetrafluoroethylene (PTFE), which is wear-resistant and corrosion-resistant, providing good guidance and friction reduction. The spring contact finger 14 is conductive, ensuring good electrical contact between the cylinder 21 and the piston 1 during the sliding process of the cylinder 21 relative to the piston 1, thus achieving reliable flow between them.

[0069] See Figure 2 The grounding switch also includes a grounding insulator 7. The housing 6 is provided with a first mounting hole 61. The grounding insulator 7 is at least partially embedded in the first mounting hole 61 and connected to the housing 6. The grounding insulator 7 is provided with a second mounting hole 70. The first end of the conductive rod 11 of the piston 1 is fixedly inserted through the second mounting hole 70, which ensures reliable insulation while simplifying the assembly process of the parts to the greatest extent.

[0070] Specifically, see Figure 2 and Figure 4 The grounding insulator 7 includes a positioning cylinder 71, a first flange portion 72, and a limiting portion 73 connected in sequence. A second mounting hole 70 passes through the positioning cylinder 71, the first flange portion 72, and the limiting portion 73. The first flange portion 72 protrudes from the outer periphery of both the positioning cylinder 71 and the limiting portion 73. The positioning cylinder 71 passes through the first mounting hole 61, and the first flange portion 72 abuts against the outer wall of the housing 6 and is connected to the housing 6 by a fastener, ensuring that the grounding insulator 7 is securely and firmly installed on the housing 6. The fastener is exemplarily a bolt or screw. The limiting portion 73 has a limiting groove 731 on its inner ring, and the conductive rod 11 of the piston 1 has a limiting protrusion 111 on its outer ring. The limiting protrusion 111 is engaged in the limiting groove 731, positioning the conductive rod 11 in the second mounting hole 70 and restricting its movement.

[0071] See Figure 1 , Figure 2 as well as Figure 5Specifically, the drive mechanism 8 includes a drive rod 81, a connecting plate 82, and an insulating plate 83. A first through hole 62 is provided on the housing 6. The drive rod 81 movably passes through the first through hole 62. One end of the drive rod 81 extending into the housing 6 is connected to the insulating plate 83 via the connecting plate 82. The insulating plate 83 is connected to the cylinder 21. When the drive rod 81 moves axially within the first through hole 62, it drives the cylinder 21 to slide along the piston 1 via the connecting plate 82 and the insulating plate 83.

[0072] Multiple moving contacts 22, cylinders 21, and stationary contacts 4 are arranged side-by-side and correspond one-to-one. Correspondingly, connecting plates 82 and insulating plates 83 extend along the arrangement direction of the moving contacts 22, so that the insulating plate 83 can simultaneously connect multiple cylinders 21, allowing the multiple cylinders 21 and moving contacts 22 to slide synchronously, achieving opening and closing. Furthermore, the outer peripheral wall of the sliding cylinder 211 of the cylinder 21 is provided with connecting blocks 213 (such as...). Figure 1 As shown, the side of the connecting block 213 facing away from the outer peripheral wall of the sliding cylinder 211 is a flat surface, so as to achieve a fixed connection with the insulating plate 83.

[0073] Optionally, one of the housing 6 and the connecting plate 82 is provided with a guide rod 9, and the other is provided with a guide hole 820. The guide rod 9 is slidably engaged with the guide hole 820 along the sliding direction of the cylinder 21, further improving the movement accuracy and stability of the cylinder 21 and the moving contact 22. Specifically, the housing 6 is provided with a guide rod 9 that extends into the housing 6. The connecting plate 82 is provided with a guide hole 820, and a sliding bearing is provided in the guide hole 820. The guide rod 9 passes through the sliding bearing and is slidably engaged with the sliding bearing.

[0074] For example, three moving contacts 22 are arranged at intervals, that is, the grounding switch includes three-phase moving contacts 22, and the sliding fit of the guide rod 9 and the guide hole 820 can ensure the centering of the three-phase moving contacts 22 when they move.

[0075] See Figure 1 The driving rod 81 moves in the same direction as the moving contact 22, and the axis of the driving rod 81 is spaced apart from the axis of the cylinder 21. To facilitate the connection between the driving rod 81 and the cylinder 21, in this embodiment, the connecting plate 82 includes a first plate 821 and a second plate 822 arranged at an angle. The first plate 821 is connected to the driving rod 81, and the second plate 822 is connected to the insulating plate 83. Furthermore, the first plate 821 and the second plate 822 are perpendicular, which makes it easier to connect the insulating plate 83 and the driving rod 81. A reinforcing plate 823 is connected between the first plate 821 and the second plate 822 to improve the strength and deformation resistance of the entire connecting plate 82. For example, one or more reinforcing plates 823 can be provided between the first plate 821 and the second plate 822.

[0076] In the embodiments of this application, the insulating board 83 is made of epoxy laminated glass cloth board (EPGC1), which has good insulation performance and high mechanical strength.

[0077] See Figure 2 and Figure 6 The stationary shield 3 is provided with a mounting cavity 31 and a second through hole 32 communicating with the mounting cavity 31. The stationary contact 4 is installed in the mounting cavity 31. The stationary part 10 also includes an arc-blocking cover 5, which is connected to the end of the stationary shield 3 near the piston 1, and the arc-blocking cover 5 encloses an arc-blocking cavity 51 directly opposite the second through hole 32. When the drive rod 81 of the drive mechanism 8 drives the cylinder 21 and the moving contact 22 to slide relative to the piston 1 and approach the stationary contact 4, the moving contact 22 can pass through the arc-blocking cavity 51 and the second through hole 32 into the mounting cavity 31 and make contact with the stationary contact 4 to achieve a conductive connection between the moving contact 22 and the stationary contact 4. Specifically, the moving contact 22 is inserted into the stationary contact 4 through an air hole 220 so that the stationary contact 4 makes conductive contact with the inner wall of the air hole 220. Furthermore, the outer diameter of the portion of the stationary contact 4 inserted into the air hole 220 is slightly smaller than the inner diameter of the air hole 220, so that the stationary contact 4 can be smoothly inserted into the air hole 220 of the moving contact 22 when the circuit is closed.

[0078] From the start of the circuit breaker tripping until the moving contact 22 and the stationary contact 4 separate, the stationary contact 4 blocks the vent 220 in the center of the moving contact 22, preventing the insulating gas in the gas chamber 210 from flowing out smoothly, thus increasing the pressure in the gas chamber 210. When the moving and stationary contacts separate and an arc is ignited, the gas in the gas chamber 210 is rapidly ejected and blown towards the arc.

[0079] By setting up the arc-blocking shield 5, when the insulating gas in the gas chamber 210 is ejected through the vent 220 to extinguish the arc, the presence of the arc-blocking shield 5 allows the insulating gas to be gathered and concentrated within the arc-blocking cavity 51, maximizing the utilization of the blown-out insulating gas. By reasonably evaluating the speed of the moving contact 22 and the possible arcing time, and calculating the blocking distance between the arc-blocking shield 5 and the moving contact 22, the arc can be extinguished within the range of the arc-blocking shield 5. In addition, the arc-blocking shield 5 can also suppress the arc within the arc-blocking cavity 51, preventing the arc from drifting around and reducing the risk of the arc-blocking shield 5 being broken down and discharged.

[0080] In this embodiment, the arc shield 5 is made of an insulating material, such as polytetrafluoroethylene, which has good insulating properties.

[0081] In this embodiment, the stationary contact 4 is made of copper-tungsten material, which is resistant to ablation.

[0082] See Figure 6The arc-isolating cover 5 has a second flange 52 around its outer periphery. The second flange 52 is fixedly connected to the stationary side shield 3, thus achieving a fixed connection between the arc-isolating cover 5 and the stationary side shield 3. For example, bolts or screws or other fasteners can be used to fix the second flange 52 and the stationary side shield 3 to ensure a stable connection.

[0083] Furthermore, in this embodiment, the cross-sectional area of ​​the arc-blocking cavity 51 gradually increases along the direction close to the moving side portion 20, so that the end of the arc-blocking cavity 51 close to the moving contact 22 forms a funnel-shaped structure, thereby gathering more insulating gas and improving the arc-extinguishing effect.

[0084] In the embodiments of this application, such as Figure 6 As shown, the stationary contact 4 specifically includes a stationary main contact 41 and a stationary arc contact 42. The stationary main contact 41 is provided with an inner through hole 411, and the stationary arc contact 42 passes through the inner through hole 411, with a gap between it and the wall of the inner through hole 411. (Combined with...) Figure 3 The moving contact 22 can be inserted between the stationary arc contact 42 and the stationary main contact 41, and is electrically connected to the stationary arc contact 42 through the vent 220. The outer wall of the moving contact 22 is electrically connected to the stationary main contact 41. That is, on the inner side of the moving contact 22, it is electrically connected to the stationary arc contact 42 through the inner wall of the vent 220, and on the outer side of the moving contact 22, it is electrically connected to the inner wall of the stationary main contact 41 through its outer wall. This effectively improves the contact stability between the moving contact 22 and the stationary contact 41, reduces contact resistance, and helps to reduce heat generation and poor contact.

[0085] More specifically, see Figure 6 The stationary main contact 41 includes multiple conductive parts distributed circumferentially along the outer periphery of the stationary arc contact 42, forming a stationary main contact 41 with an inner through hole 411. Each conductive part has an elastic element 412 on the side facing away from the stationary arc contact 42. The stationary side portion 10 also includes a stationary side mounting portion, on which a stationary side shield 3 is mounted, and the stationary side mounting portion is partially located inside the stationary side shield 3. The stationary main contact 41 is located inside the stationary side mounting portion, and its multiple conductive parts elastically abut against the stationary side mounting portion through the elastic element 412. When the moving contact 22 enters between the stationary main contact 41 and the stationary arc contact 42, the multiple conductive parts can open outward and compress the elastic element 412. This facilitates the smooth insertion of the moving contact 22 into the stationary contact 4, and the elastic force of the elastic element 412 ensures good conductive contact between the moving contact 22 and the stationary main contact 41.

[0086] The working principle of the grounding switch provided in this embodiment is as follows:

[0087] When closing the circuit breaker, please refer to [the relevant documentation]. Figure 1 and Figure 2Under the action of the drive rod 81, the cylinder 21 and the moving contact 22 move linearly as a whole through the connecting plate 82 and the insulating plate 83. The cylinder 21 slides with the piston 1, and the moving contact 22 gradually approaches the stationary contact 4 until the moving contact 22 passes through the arc-blocking cavity 51 and the second through hole 32 and enters the stationary shield 3, where it is inserted and engaged with the stationary contact 4, completing the closing operation. The closed state is as follows: Figure 3 As shown. During the closing process, the gas chamber 210 expands and the pressure decreases. External insulating gas is quickly replenished into the gas chamber 210 through the air hole 220 of the moving contact 22, achieving a balance between the internal and external gas pressures.

[0088] During the opening process, under the action of the drive rod 81, the cylinder 21 and the moving contact 22 move away from the stationary side portion 10 together, compressing the gas inside the cylinder. In the initial opening phase, the moving contact 22 slides against the stationary contact 4, blocking the gas flow out of the cylinder 21, compressing the gas chamber 210 and increasing the pressure within it. At the instant the moving contact 22 and the stationary contact 4 separate, the gas is blown out through the air hole 220, extinguishing the arc. During the arc extinguishing process, the arc-blocking cover 5, on the one hand, gathers the gas inside the arc-blocking cavity 51 to enhance the blowing capability, and on the other hand, acts as insulation, ensuring that the arc remains between the moving contact 22 and the stationary contact 4 and cannot drift onto the stationary side shield 3.

[0089] This application also provides a switchgear, including a circuit breaker, a disconnecting switch, a linkage mechanism, and a grounding switch as described above. The linkage mechanism connects the circuit breaker, the disconnecting switch, and the grounding switch. For example, the linkage mechanism is used to lock the disconnecting switch and the grounding switch after the circuit breaker is closed. Exemplarily, the switchgear is a GIS (Gas Insulated Metal Enclosed Switchgear). The composition and connection of the GIS (such as the linkage between the linkage mechanism and the circuit breaker, the grounding switch, and the disconnecting switch) are existing mature technologies and will not be described in detail here.

[0090] The advantages of the switching device having the grounding switch provided in this embodiment are as described above.

[0091] It is understood that the grounding switch provided in this embodiment can also be used alone to achieve opening and closing, or it can be applied in the above-mentioned switching equipment and used in conjunction with circuit breakers and disconnecting switches.

[0092] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A grounding switch, characterized in that, It includes a housing (6), a stationary part (10), a moving part (20), and a drive mechanism (8); The moving side portion (20) includes a cylinder (21) and a moving contact (22) disposed on the cylinder (21); a piston (1) is disposed inside the cylinder (21), and the piston (1) is fixedly connected to the housing (6); an air hole (220) is disposed at the end of the moving contact (22), and the air hole (220) communicates with the inner cavity of the cylinder (21); The drive mechanism (8) is used to drive the cylinder (21) and the moving contact (22) to move synchronously relative to the piston (1), and the moving contact (22) contacts or separates from the stationary side portion (10) under the drive of the drive mechanism (8).

2. The grounding switch according to claim 1, characterized in that, The cylinder (21) has a connecting hole (2121) at the end where the moving contact (22) is located, and the air hole (220) is connected to the inner cavity of the cylinder (21) through the connecting hole (2121).

3. The grounding switch according to claim 2, characterized in that, The cylinder (21) includes a sliding cylinder (211), one end of which is open and the other end is provided with an end plate (212). The connecting hole (2121) is provided on the end plate (212). The piston (1) extends out of the cylinder (21) through the opening and is fixedly connected to the housing (6). The inner wall of the sliding cylinder (211) is sealed to the piston (1) and in sliding contact. The moving contact (22) includes a contact portion (221) and a fixing portion (222) connected together. The contact portion (221) can contact the stationary side portion (10), and the fixing portion (222) is fixedly connected to the end plate (212). And / or, the piston (1) includes a conductive rod (11), the first end of which is connected to the housing (6), and the second end of which is provided with a piston portion (12), which is sealed and slidably engaged with the cylinder (21).

4. The grounding switch according to claim 1, characterized in that, The grounding switch also includes a grounding insulator (7), the housing (6) is provided with a first mounting hole (61), the grounding insulator (7) is at least partially embedded in the first mounting hole (61) and connected to the housing (6), the grounding insulator (7) is provided with a second mounting hole (70), and the piston (1) is fixedly inserted through the second mounting hole (70).

5. The grounding switch according to claim 4, characterized in that, The grounding insulator (7) includes a positioning cylinder (71), a first flange (72) and a limiting part (73) connected in sequence, and the second mounting hole (70) passes through the positioning cylinder (71), the first flange (72) and the limiting part (73); The positioning cylinder (71) passes through the first mounting hole (61), the first flange (72) abuts against the outer wall of the housing (6) and is connected to the housing (6) by a fastener, the limiting part (73) has a limiting groove (731) in the inner ring, the piston (1) has a limiting protrusion (111) in the outer ring, and the limiting protrusion (111) is engaged in the limiting groove (731).

6. The grounding switch according to claim 1, characterized in that, The driving mechanism (8) includes a driving rod (81), a connecting plate (82), and an insulating plate (83); The housing (6) is provided with a first through hole (62), the drive rod (81) is movably passed through the first through hole (62), one end of the drive rod (81) extending into the housing (6) is connected to the insulating plate (83) through the connecting plate (82), and the insulating plate (83) is connected to the cylinder (21). And / or, one of the housing (6) and the drive mechanism (8) is provided with a guide rod (9), and the other is provided with a guide hole (820), and the guide rod (9) is slidably engaged with the guide hole (820) along the moving direction of the moving contact (22).

7. The grounding switch according to any one of claims 1-6, characterized in that, The stationary side portion (10) includes a stationary side shield (3), a stationary contact (4), and an arc-blocking shield (5); The static side shield (3) is provided with a mounting cavity (31) and a second through hole (32) communicating with the mounting cavity (31), and the static contact (4) is installed in the mounting cavity (31); The arc-blocking cover (5) is connected to the static side shield (3), and the arc-blocking cover (5) encloses an arc-blocking cavity (51) that is directly opposite to the second through hole (32); The moving contact (22) can pass through the arc-blocking cavity (51) and the second through hole (32) into the mounting cavity (31) and be inserted into the stationary contact (4).

8. The grounding switch according to claim 7, characterized in that, The outer periphery of the arc shield (5) is provided with a second flange (52), and the second flange (52) is fixedly connected to the static side shield (3); And / or, the cross-sectional area of ​​the arc-blocking cavity (51) gradually increases along the direction close to the moving side portion (20).

9. The grounding switch according to claim 7, characterized in that, The stationary contact (4) includes a stationary main contact (41) and a stationary arc contact (42). The stationary main contact (41) is provided with an inner through hole (411). The stationary arc contact (42) passes through the inner through hole (411) and is spaced apart from the hole wall of the inner through hole (411). The moving contact (22) can be inserted between the stationary arc contact (42) and the stationary main contact (41), and is electrically connected to the stationary arc contact (42) through the air hole (220). The outer wall of the moving contact (22) is in electrical contact with the stationary main contact (41).

10. A switching device, characterized in that, It includes a circuit breaker, a disconnecting switch, a linkage mechanism, and a grounding switch as described in any one of claims 1-9, wherein the linkage mechanism connects the circuit breaker, the disconnecting switch, and the grounding switch.

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