A pressure-equalizing three-position disconnect switch for an environmentally friendly gas cabinet

Abstract

This invention discloses a pressure-equalizing three-position disconnect switch for environmentally friendly gas cabinets, including a stationary contact base with a V-shaped structure. The stationary contact base is mounted on an insulating beam, and the V-shaped opening of the stationary contact base is adapted to the V-shaped tip of the insulating beam. A moving contact is slidably assembled inside the stationary contact base. A linkage assembly is driven by an insulating shaft. In the linkage assembly, two moving contacts (isolation moving contact and grounding moving contact) move simultaneously through the same insulating shaft, and can be quickly switched mutually exclusive, eliminating the possibility of simultaneous closing of isolation and grounding due to misoperation. The V-shaped overlapping combination of the insulating beam and the stationary contact base can significantly improve the performance and reliability of the equipment. The natural geometric stability of the V-shaped structure (triangle principle) combined with the stacked design forms a three-dimensional support frame, reducing local stress concentration. The modular installation of the V-shape is stacked vertically, reducing the horizontal projected area, reducing the volume, and adapting to space-constrained scenarios such as underground substations.

Description

Technical Field

[0001] This invention belongs to the field of disconnector technology, specifically relating to a pressure-equalizing three-position disconnector for environmentally friendly gas cabinets. Background Technology

[0002] With the acceleration of global industrialization, power system voltage levels are constantly increasing (e.g., from 10kV to 110kV, 220kV, and even 500kV), and traditional low-voltage power distribution equipment can no longer meet the needs of high-voltage scenarios. Three-position disconnect switches were initially used in fully enclosed switchgear (GIS) and pass-through switch (PASS) systems, adapting to high-voltage environments through integrated design. During circuit inspection or maintenance, a clearly visible disconnect point is required to ensure personnel safety. Traditional disconnect switches can only switch the circuit on and off, while grounding switches require separate operation. This separate design makes them prone to safety accidents due to misoperation (e.g., closing the grounding switch while the main circuit is energized). Three-position disconnect switches, through mechanical interlocking design, integrate isolation and grounding functions, fundamentally eliminating such risks.

[0003] Conventional disconnect switches have extremely uneven electric field distribution, requiring larger dimensions to meet insulation requirements. When circuit breakers use solid-sealed poles, the size of the disconnect switch determines the overall size of the environmental protection cabinet. Under the current market conditions, it is necessary to meet both environmental protection requirements and the requirement for a small external size (the State Grid tender for 10kV voltage level requires the external size and installation dimensions of the environmental protection cabinet to be equivalent to those of SF6 insulated cabinets). This places higher demands on the design and manufacturing of environmental protection cabinets. It is becoming increasingly difficult to achieve small-volume environmental protection cabinets at 24kV and 36kV (40.5kV in China), which means that the internal space utilization of the cabinet needs to be higher. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure-equalizing three-position disconnect switch for environmentally friendly gas cabinets, so as to solve the problems of modularity, size installation, and space utilization in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A pressure-equalizing three-position disconnect switch for an environmentally friendly gas cabinet includes a front mounting plate and a rear mounting plate. A mounting beam, an insulating beam, and an insulating shaft are connected and fixed between the front mounting plate and the rear mounting plate. The insulating beam is configured with a V-shaped structure. A stationary contact seat, which has a V-shaped structure, is mounted on the insulating beam. The V-shaped opening of the stationary contact seat is adapted to the V-shaped tip of the insulating beam. A moving contact is slidably assembled inside the stationary contact seat.

[0006] The linkage component is driven by the insulating shaft, and one end of the linkage component is also connected to the moving contact. The rotation of the insulating shaft drives the linkage component to work with the moving contact to change the state of the three working positions.

[0007] Preferably, the insulating beam has embedded holes at both ends and a plurality of umbrella skirts on the insulating beam.

[0008] Preferably, a reinforcing rib is provided between the umbrella skirts, and the reinforcing rib has a fastening hole inside, and the insulating beam is fixedly connected to the stationary contact seat through the reinforcing rib.

[0009] Preferably, at least two umbrella skirts are provided between the reinforcing ribs.

[0010] Preferably, the stationary contact seat includes a first shaft and a second shaft. The stationary contact seat is provided with a steel back bearing inside. The outer wall of the stationary contact seat is fitted with a positioning screw for locking the steel back bearing. A guide groove is provided on one side of the stationary contact seat. A boss is provided on the stationary contact seat. The insulating beam is mounted on the boss. The surface of the boss is provided with a hole that is concentric with the fastening hole. A terminal is provided on the first shaft. The first shaft and the second shaft are integrally formed.

[0011] Preferably, both the first and second shaft cylinders have an arc-shaped head at their upper ends, and a spring contact finger is installed inside the arc-shaped head.

[0012] Preferably, the linkage assembly includes a transmission plate, which is fixedly connected to an insulating shaft. Two reinforcing bolts are connected to the transmission plate, and linkage rods are rotatably connected to the two reinforcing bolts. Concentric shafts are connected to the two linkage rods, and moving contacts are connected to the two concentric shafts respectively. The moving contacts are an isolating moving contact and a grounding moving contact. The isolating moving contact is located inside the second shaft cylinder, and the grounding moving contact is located inside the first shaft cylinder. A shaft hole is provided on the surface of the transmission plate for cooperating with the insulating shaft. The isolating moving contact and the grounding moving contact are slidably sleeved in the steel back bearing.

[0013] Preferably, the transmission plate is configured in a fan shape, the circular end of the transmission plate does not contact the stationary contact seat, and the reinforcing bolts are symmetrically located at the arc ends of the transmission plate.

[0014] Preferably, both the isolating moving contact and the grounding moving contact have a path groove at their bottom ends.

[0015] Preferably, one side of the linkage rod is arc-shaped. When either the isolating moving contact or the grounding moving contact is in the closed position, the arc-shaped part of the linkage rod will remain concentric with the insulating shaft, and the arc-shaped part of either linkage rod will abut against the bottom of the arc head.

[0016] The technical solution of this invention has the following beneficial effects: 1. The V-shaped structure of the insulating beam better accommodates the V-shaped stationary contact base. Under the operation of the specialized operating mechanism, its insulating shaft rotates, driving the linkage assembly to rotate. The equalizing three-position disconnector can achieve rapid opening, closing, and grounding operations, completing a high level of fault closing capability. In the linkage assembly, two moving contacts (the isolating moving contact and the grounding moving contact) move simultaneously via the same insulating shaft and can be quickly and mutually exclusive, eliminating the possibility of simultaneous closing of the isolating and grounding contacts due to misoperation.

[0017] 2. The V-shaped overlapping installation of the insulating beam and the stationary contact seat can significantly improve the performance and reliability of the equipment. The natural geometric stability of the V-shaped structure (triangle principle) combined with the layered design forms a three-dimensional support frame, reducing local stress concentration. The V-shaped overlapping installation increases the break distance and improves the break withstand voltage. The modular installation of the V-shape is stacked in the vertical direction, reducing the horizontal projected area and shrinking the volume, making it suitable for space-constrained scenarios such as underground substations. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the insulating beam structure of the present invention.

[0022] Figure 4 This is an overall internal cross-sectional view of the present invention.

[0023] Figure 5 This is a schematic cross-sectional view of the isolation closing mechanism of the present invention.

[0024] Figure 6 This is a schematic cross-sectional view of the grounding closing mechanism of the present invention.

[0025] Figure 7 This is a schematic diagram of the static contact seat structure of the present invention.

[0026] Figure 8 This is a partial cross-sectional plan view of the present invention.

[0027] Figure 9 This is a partial cross-sectional perspective view of the present invention.

[0028] Figure 10 This is a cross-sectional view of the internal structure of the static contact seat of the present invention.

[0029] Figure 11 This is an exploded view of the internal structure of the static contact seat of the present invention.

[0030] Reference numerals: 10, front mounting plate; 101, rear mounting plate; 102, mounting beam; 103, grounding contact seat; 104, insulating shaft; 105, isolating contact seat; 20, insulating beam; 201, embedded hole; 202, umbrella skirt; 203, reinforcing rib; 204, fastening hole; 30, stationary contact seat; 3001, first shaft cylinder; 3002, second shaft cylinder; 301, steel back bearing; 302, spring contact finger; 303, arc head; 304, positioning screw; 305, terminal block; 306, boss; 307, guide groove; 40, linkage assembly; 401, transmission plate; 402, shaft hole; 403, reinforcing bolt; 404, linkage rod; 405, isolating moving contact; 4051, grounding moving contact; 406, concentric shaft; 407, path groove. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0032] Example 1: Reference Figures 1-11 , A pressure-equalizing three-position disconnect switch for an environmentally friendly gas cabinet includes a front mounting plate 10 and a rear mounting plate 101. A mounting beam 102, an insulating beam 20, and an insulating shaft 104 are connected and fixed between the front mounting plate 10 and the rear mounting plate 101. The insulating beam 20 is configured with a V-shaped structure. In the embodiments of the present invention, reference is made to Figure 1 and Figure 2 The front mounting plate 10 and the rear mounting plate 101 are the basic mounting planes of the three-position disconnect switch of the present invention. The mounting beam 102 and the insulating beam 20 support the front mounting plate 10 and the rear mounting plate 101 for assembly.

[0033] The stationary contact seat 30 has a V-shaped structure and is mounted on the insulating beam 20. The V-shaped opening of the stationary contact seat 30 is adapted to the V-shaped tip of the insulating beam 20. The moving contact is slidably assembled inside the stationary contact seat 30.

[0034] In this embodiment of the invention, setting the insulating beam 20 into a V-shaped structure allows for better adaptation to the installation of the V-shaped stationary contact base 30. Here, the V-shaped opening of the stationary contact base 30 matches the V-shaped tip of the insulating beam 20. Therefore, it can be concluded that the opening size of the stationary contact base 30 is larger than the opening size of the insulating beam 20, and the included angle between the stationary contacts 30 is X (reference). Figure 5 The stationary contact 30 adopts a V-shaped structure, and its pointed ends can remain connected to each other, providing a good working environment for the linkage component 40. Secondly, the angle between X is designed to be between 50° and 60°, and in this invention, the angle between X is preferably 60° to accommodate the connection of the linkage component 40. The moving contact is initially hidden inside the stationary contact 30 (see reference). Figure 4 ).

[0035] In an embodiment of the present invention, optionally, the stationary contact 30 has a cylindrical structure with all edges rounded off, eliminating sharp edges. The cylindrical structure is symmetrical in both the axial and radial directions. When the moving contact (usually also cylindrical) is inserted, the electric field distribution at the contact surface is uniform, avoiding insulation breakdown caused by localized electric field concentration. Furthermore, the cylindrical shape can increase the heat dissipation area by increasing the diameter or length, and combined with air convection or forced cooling, improves the current-carrying capacity. The movement of the moving contact is entirely linear, eliminating the adverse effects of electrodynamic forces on closing during operation. The area where arcing might occur is separated from the stable current-conducting area, improving operational reliability.

[0036] The linkage component 40 is driven by the insulating shaft 104. One end of the linkage component 40 is also connected to the moving contact. The rotation of the insulating shaft 104 drives the linkage component 40 to work with the moving contact to change the state of the three working positions.

[0037] In this implementation scheme, the three-position states are: open, closed, and grounded. A dynamic seal exists on the side of the insulating shaft 104. An O-ring and bearing are installed in the groove inside the dynamic seal. Before installation in the cabinet, it is temporarily fixed to the front mounting plate 10. After installation, it is tightened from the outside of the gas chamber of the gas-filled switchgear to the front mounting plate 10, forming a natural seal. Simultaneously, the bearing inside the dynamic seal allows the dynamic seal itself to rotate while ensuring the gas chamber is sealed. The external surface of the dynamic seal has an interface for connection with a dedicated mechanism, and the internal surface has an interface for connection with the insulating shaft 104. Under the operation of the specialized operating mechanism, the rotation of the insulating shaft 104 drives the rotation of the linkage component 40. The equalizing three-position disconnector can achieve rapid opening, closing, and grounding operations, completing a high level of fault closing capability. The linkage component 40 is installed and connected to the V-shaped stationary contact seat 30, which can significantly improve the utilization of internal space.

[0038] In order to further improve the insulation performance of the three-position disconnect switch, the insulating beam 20 is provided with embedded holes 201 at both ends, and the insulating beam 20 is provided with several umbrella skirts 202.

[0039] In this embodiment of the invention, an insert nut is built into the embedded hole 201. The use of the insert nut ensures the installation strength of the insulating beam 20. The umbrella skirt 202 is used to increase the creepage distance between phases, ensuring the insulation strength and improving the structural strength of the insulating beam 20. Described in terms of the cross-section of the insulating beam 20, the umbrella skirt 202 covers the outer wall of the cross-section of the insulating beam 20 in a V-shape. The insert nuts are symmetrically arranged at both ends of the V-shaped insulating beam 20. The front end is fixedly connected to the front mounting plate 10, and the rear end is fixedly connected to the rear mounting plate 101. The front mounting plate 10 and the rear mounting plate 101 are further reinforced by the mounting beam 102. A grounding contact seat 103 is provided on the mounting beam 102, forming the basic structure of the equalizing three-position disconnect switch. The stationary contact seat 30 is fixed on the insulating beam 20 to form the body of the equalizing three-position disconnect switch.

[0040] A reinforcing rib 203 is provided between the umbrella skirts 202. The reinforcing rib 203 has a fastening hole 204 inside. The insulating beam 20 is fixedly connected to the stationary contact seat 30 through the reinforcing rib 203.

[0041] In the embodiments of the present invention, reference is made to Figure 3 The reinforcing rib 203 is the main connection point with the stationary contact seat 30, and its fastening hole 204 is also equipped with an insert nut to ensure the connection strength of the installation structure. The reinforcing rib 203 is only located on the inner included angle surface of the V-shaped insulating beam 20.

[0042] At least two umbrella skirts 202 are provided between the reinforcing ribs 203.

[0043] In the embodiments of the present invention, reference is made to Figure 3 Compared to a single-skirt design, a double-skirt design further extends the creepage path, significantly improving insulation margin, especially in polluted or humid environments (such as coastal or industrial areas). The raised structure of the skirt 202 increases air convection, aiding in heat dissipation. The design of two or more skirts 202 optimizes temperature distribution, reducing cracking or deformation caused by thermal stress.

[0044] The stationary contact seat 30 includes a first shaft cylinder 3001 and a second shaft cylinder 3002. A steel back bearing 301 is provided inside the stationary contact seat 30. A positioning screw 304 is fastened to the outer wall of the stationary contact seat 30 to lock the steel back bearing 301. A guide groove 307 is provided on one side of the stationary contact seat 30. A boss 306 is provided on the stationary contact seat 30. An insulating beam 20 is mounted on the boss 306. The surface of the boss 306 is provided with a hole that is concentric with the fastening hole 204. A terminal block 305 is provided on the first shaft cylinder 3001.

[0045] In the embodiments of the present invention, reference is made to Figures 4-11The steel back bearing 301 has a cylindrical structure with an open side that is not closed. The direction of the opening corresponds to the position of the guide groove 307. The steel back bearing 301 is nested inside the first shaft cylinder 3001 and the second shaft cylinder 3002. The positioning screw 304 is locked inside the first shaft cylinder 3001 and the second shaft cylinder 3002. The surface of the steel back bearing 301 has a hole that mates concentrically with the positioning screw 304. The positioning screw 304 can fix the steel back bearing 301 inside the stationary contact seat 30. There are two positioning screws 304 on each shaft cylinder, which fix it from both sides, preventing it from rotating or falling off from the bottom. The moving contact is wrapped in the steel back bearing 301 inside the shaft cylinder and can slide smoothly within it. The guide groove 307 has a wide opening at the bottom and a narrow opening at the top. When the linkage component moves, it enters the guide groove 307, thereby limiting the movement position of the linkage component.

[0046] The first shaft cylinder 3001 and the second shaft cylinder 3002 form a V-shaped structure. The boss 306 is located on the included angle surface inside the V-shape (the included angle between the first shaft cylinder 3001 and the second shaft cylinder 3002). When the stationary contact seat 30 is installed with the insulating beam 20, the boss 306 is aligned with the reinforcing rib 203 of the insulating beam 20. Specifically, the fastening hole 204 in the reinforcing rib 203 is concentrically aligned with the hole on the boss 306. When installing the bolt for the insert nut in the fastening hole 204, the bolt is inserted into the shaft cylinder from the guide groove 307 and located in the hole of the boss 306. A screwdriver is then inserted from the guide groove 307 to tighten the bolt locked inside the fastening hole 204, thus completing the fixed installation of the stationary contact seat 30. Finally, the V-shaped overlapping installation of the insulating beam 20 and the stationary contact seat 30 can significantly improve the performance and reliability of the equipment. The natural geometric stability of the V-shaped structure (triangle principle) combined with the layered design forms a three-dimensional support frame, reducing local stress concentration. The V-shaped overlapping installation increases the break distance and improves the break withstand voltage. The V-shaped modular installation is stacked in the vertical direction, reducing the horizontal projected area and shrinking the volume, making it suitable for space-constrained scenarios such as underground substations.

[0047] To improve the structural performance of the stationary contact seat 30, the first shaft cylinder 3001 and the second shaft cylinder 3002 are integrally formed.

[0048] In the embodiments of the present invention, further, refer to Figure 7 The integrally formed V-shaped stationary contact base 30 reduces the number of connection points between components, lowering the debugging requirements caused by installation errors. The insulating shaft 104 does not have direct contact with the integral stationary contact base 30 (see reference). Figure 8 and Figure 9 Therefore, there is no surface discharge problem on the phase-to-phase distance of the insulating shaft 104 that may be caused by excessively small creepage distance.

[0049] Both the upper ends of the first shaft cylinder 3001 and the second shaft cylinder 3002 are provided with arc-shaped heads 303, and spring contact fingers 302 are installed inside the arc-shaped heads 303.

[0050] In the embodiments of the present invention, reference is made to Figures 4-11 Because the location where an electric arc might occur during closing is at the end of the moving contact (the part that first approaches the other stationary contact 30), and the location of the main current flow is at the part in contact with the spring contact finger 302, the present invention has a high electrical life. The arc-shaped head 303 maximizes the uniformity of the electric field between the breaks. The spring contact finger 302, through its elastic deformation capability, generates continuous and stable contact pressure between the contact surfaces.

[0051] The linkage assembly 40 includes a transmission plate 401, which is fixedly connected to the insulating shaft 104. Two reinforcing bolts 403 are connected to the transmission plate 401, and linkage rods 404 are rotatably connected to the two reinforcing bolts 403 respectively. Concentric shafts 406 are connected to the two linkage rods 404, and moving contacts are connected to the two concentric shafts 406 respectively. The moving contacts are an isolating moving contact 405 and a grounding moving contact 4051. The isolating moving contact 405 is located inside the second shaft cylinder 3002, and the grounding moving contact 4051 is located inside the first shaft cylinder 3001. A shaft hole 402 is opened on the surface of the transmission plate 401 for cooperating with the insulating shaft 104. The isolating moving contact 405 and the grounding moving contact 4051 are slidably sleeved in the steel back bearing 301.

[0052] In the embodiments of the present invention, reference is made to Figures 1-11 The rotation of the insulating shaft 104 drives the transmission plate 401 to rotate. Each set of linkage components 40 has two transmission plates 401, and the linkage rod 404 is placed between the two transmission plates 401 to improve the connection stability of the linkage rod 404. The linkage rod 404 is connected by a reinforcing bolt 403. Here, the reinforcing bolt 403 does not completely lock the linkage rod 404, that is, the linkage rod 404 can rotate freely on the reinforcing bolt 403. A concentric shaft 406 (pin connection) is connected to the top part of the linkage rod 404. The linkage rod 404 can rotate around the concentric shaft 406, which is fixed to the bottom of the moving contact, that is, to isolate the moving contact 405 and the grounding moving contact 4051. The moving contact is slidably restricted in the steel back bearing 301, so that the rotation of the transmission plate 401 can drive the linkage rod 404 to deflect, and finally make the moving contact slide in the steel back bearing 301 to realize the change of the three working positions.

[0053] Here, the transmission plate 401 is made of insulating material, and the center end (shaft hole 402) is made of hexagonal hole to match the hexagonal shape of the insulating shaft 104. The linkage rod 404 is also made of insulating material, and one end is clamped between the two transmission plates 401 and connected by reinforcing bolts 403. The reinforcing bolts 403 are also made of insulating material.

[0054] More specifically, in the three-station state changes, such as Figure 4 As shown: the isolating moving contact 405 and the grounding moving contact 4051 are both hidden inside the integrated stationary contact base 30 assembly. At this time, the equalizing three-position disconnect switch is in the isolated position. Figure 5 As shown: When the insulating shaft 104 is rotated clockwise, the isolating moving contact 405 is pushed to the closed position by the linkage rod 404 driven by the transmission plate 401, and the isolating moving contact 405 is inserted into the isolating contact seat 105. At this time, the grounding moving contact 4051 is in the open position (the grounding moving contact 4051 is disengaged from the grounding contact seat 103). During the movement of the linkage rod 404, due to the mechanical connection, the linkage rod 404 below the isolating moving contact 405 is blocked by the arc head 303 on the second shaft cylinder 3002 and cannot move towards the isolating contact seat 105, thereby ensuring the limit position of closing and the stability of opening and closing. The isolating contact seat 105 at one end of the circuit breaker that cooperates with the disconnecting switch is not part of the disconnecting switch but is a contact that the disconnecting switch must cooperate with, so it is shown for reference in the figure, indicating that the isolating moving contact 405 has reached the isolating closed position. In the diagram, L1 and L2 are the opening distances of the isolating switch and the grounding switch, respectively. Setting different values ​​can meet different insulation requirements, thus allowing them to be used for different voltage levels. Since the insulation voltage requirements of the isolating and grounding contacts are different, the values ​​of L1 and L2 can be equal or unequal. When they are equal, the lengths of the isolating moving contact and the grounding moving contact are equal. When they are unequal, their dimensions need to be adjusted. Specifically, the corresponding dimensions should be set according to the distance between L1 and L2. In the appendix Figure 4 Based on the above, as shown in the appendix Figure 6 When the insulating shaft 104 is rotated counterclockwise, the grounding moving contact 4051 is pushed to the closed position by the linkage rod 404 driven by the transmission plate 401. At this time, the disconnecting switch changes to the grounding state. The grounding moving contact 4051 is in the closed position and is inserted into the grounding contact seat 103. At this time, the isolating moving contact 405 is in the open position (the isolating moving contact 405 is disengaged from the isolating contact seat 105). Similarly, during the movement of the linkage rod 404, due to the mechanical connection, the linkage rod 404 below the grounding moving contact 4051 will be blocked by the arc head 303 on the first shaft cylinder 3001 and cannot move towards the grounding contact seat 103, thereby ensuring the limit position of closing and the stability of opening and closing.

[0055] In summary, it can be concluded that by driving two moving contacts (isolation moving contact 405 and grounding moving contact 4051) simultaneously through the same insulating shaft 104, they can be quickly switched out of mutual exclusion. When the isolation moving contact 405 is closed, the grounding moving contact 4051 must be in the open position, and vice versa. There is also an intermediate position where the isolation moving contact 405 and the grounding moving contact 4051 are respectively hidden inside the second shaft cylinder 3002 and the first shaft cylinder 3001. Therefore, the present invention has three working positions: isolation closing, isolation (grounding) opening, and ground closing.

[0056] The transmission plate 401 is configured in a fan shape, and the circular end of the transmission plate 401 does not contact the stationary contact seat 30. The reinforcing bolts 403 are symmetrically located at the arc end of the transmission plate 401.

[0057] In the embodiments of the present invention, reference is made to Figure 8 and Figure 9 The fan-shaped transmission plate 401 optimizes the compactness of the spatial structure. The circular end of the transmission plate 401 is concentric with the insulating shaft 104; the reinforcing bolt 403 is located at the arc end of the transmission plate 401, meaning that the linkage rod 404 is also rotatably connected to the arc end of the transmission plate 401. Therefore, the two rotatably connected linkage rods 404 on the arc end of the transmission plate 401 form a mechanical interlock, preventing misoperation through geometric constraints. For example, the operation is performed in a fixed sequence of "opening the switch → grounding" or "grounding → opening the switch," eliminating the risk of reverse operation. Furthermore, the arc-shaped structure optimizes the utilization of the internal space of the cabinet.

[0058] Both the isolating moving contact 405 and the grounding moving contact 4051 have a path groove 407 at their bottom ends.

[0059] In the embodiments of the present invention, see Figure 11 During the rotation of the linkage rod 404, the path groove 407 can prevent the bottom of the moving contact from interfering with the operation of the linkage rod 404, thus improving the integrity of the structure.

[0060] One side of the linkage rod 404 is arc-shaped. When either the isolating moving contact 405 or the grounding moving contact 4051 is in the closed position, the arc-shaped part of the linkage rod 404 will remain concentric with the insulating shaft 104. At the same time, the arc-shaped part of either linkage rod 404 will abut against the bottom of the arc head 303.

[0061] In one embodiment of the present invention, as described above, "During the movement of the linkage rod 404, due to the mechanical connection, the linkage rod 404 below the isolating moving contact 405 is blocked by the arc head 303 on the second shaft cylinder 3002 and cannot move towards the isolating contact seat 105." Here, the arc-shaped part of the linkage rod 404 is blocked by the arc head 303. By optimizing the arc structure, the maximum push distance of the linkage rod 404 can be controlled, ensuring that the linkage rod 404 can complete the mechanical interlock with the transmission plate 401. At the same time, the arc-shaped part of the other linkage rod 404 will also remain concentric with the insulating shaft 104. In the isolation and grounding states, the linkage rod 404 always maintains the conversion between these two forms, with the arc part remaining concentric with the insulating shaft 104, or the arc part abutting against the arc head 303 below.

[0062] The specific implementation process of this invention is as follows: like Figure 4 As shown: the isolating moving contact 405 and the grounding moving contact 4051 are both hidden inside the integrated stationary contact base 30 assembly. At this time, the equalizing three-position disconnect switch is in the isolated position. Figure 5 As shown: When the insulating shaft 104 is rotated clockwise, the isolating moving contact 405 is pushed to the closed position by the linkage rod 404 driven by the transmission plate 401, and the isolating moving contact 405 is inserted into the isolating contact seat 105. At this time, the grounding moving contact 4051 is in the open position (the grounding moving contact 4051 is disengaged from the grounding contact seat 103).

[0063] In the appendix Figure 4 Based on the above, as shown in the appendix Figure 6 When the insulating shaft 104 is rotated counterclockwise, the grounding moving contact 4051 is pushed to the closed position by the linkage rod 404 driven by the transmission plate 401. At this time, the disconnecting switch changes to the grounding state. At this time, the grounding moving contact 4051 is in the closed position and is inserted into the grounding contact seat 103. At this time, the isolating moving contact 405 is in the open position (the isolating moving contact 405 is disengaged from the isolating contact seat 105).

[0064] The above embodiments are merely exemplary models of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Various modifications or equivalent substitutions can be made to the present invention within its spirit and scope of protection. Such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

[0065] In the description of this invention, it should be noted that the terms "inner," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the appended circle, or the orientation or positional relationship in which the product of this invention is conventionally placed during use. They are used only for the convenience of describing the invention and simplifying the description, 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, these terms indicating orientation or positional relationships should not be construed as limitations on the invention.

[0066] In the description of this invention, it should be further noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, these terms can refer to a fixed connection, a detachable connection, or an integral connection between elements; they can also refer to a mechanical connection or an electrical connection; or they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

Claims

1. A pressure-equalizing three-position disconnect switch for an environmentally friendly gas cabinet, characterized in that, It includes a front mounting plate (10) and a rear mounting plate (101). A mounting beam (102), an insulating beam (20), and an insulating shaft (104) are connected and fixed between the front mounting plate (10) and the rear mounting plate (101). The insulating beam (20) is configured with a V-shaped structure. A stationary contact seat (30) has a V-shaped structure and is mounted on the insulating beam (20). The V-shaped opening of the stationary contact seat (30) is adapted to the V-shaped tip of the insulating beam (20). A moving contact is slidably assembled inside the stationary contact seat (30). A linkage assembly (40) is driven by the insulating shaft (104). One end of the linkage assembly (40) is also connected to the moving contact. The rotation of the insulating shaft (104) drives the linkage assembly (40) to work with the moving contact to change the state of the three working positions.

2. The equalizing three-position disconnect switch for an environmentally friendly gas cabinet according to claim 1, characterized in that: The insulating beam (20) has embedded holes (201) at both ends, and a number of umbrella skirts (202) are provided on the insulating beam (20).

3. The equalizing three-position disconnect switch for an environmentally friendly gas cabinet according to claim 2, characterized in that: A reinforcing rib (203) is provided between the umbrella skirts (202), and a fastening hole (204) is provided inside the reinforcing rib (203). The insulating beam (20) is fixedly connected to the stationary contact seat (30) through the reinforcing rib (203).

4. The equalizing three-position disconnect switch for an environmentally friendly gas cabinet according to claim 3, characterized in that: At least two umbrella skirts (202) are provided between the reinforcing ribs (203).

5. The equalizing three-position disconnect switch for an environmentally friendly gas cabinet according to claim 3, characterized in that: The stationary contact seat (30) includes a first shaft cylinder (3001) and a second shaft cylinder (3002). A steel back bearing (301) is provided inside the stationary contact seat (30). A positioning screw (304) is fastened to the outer wall of the stationary contact seat (30) to lock the steel back bearing (301). A guide groove (307) is provided on one side of the stationary contact seat (30). A boss (306) is provided on the stationary contact seat (30). The insulating beam (20) is installed in contact with the boss (306). The surface of the boss (306) is provided with a hole that is concentric with the fastening hole (204). A terminal block (305) is provided on the first shaft cylinder (3001). The first shaft cylinder (3001) and the second shaft cylinder (3002) are integrally formed.

6. The equalizing three-position disconnect switch for an environmentally friendly gas cabinet according to claim 5, characterized in that: Both the first shaft cylinder (3001) and the second shaft cylinder (3002) are provided with arc-shaped heads (303) at their upper ends, and spring contact fingers (302) are installed inside the arc-shaped heads (303).

7. The equalizing three-position disconnect switch for an environmentally friendly gas cabinet according to claim 6, characterized in that: The linkage assembly (40) includes a transmission plate (401), which is fixedly connected to an insulating shaft (104). Two reinforcing bolts (403) are connected to the transmission plate (401), and linkage rods (404) are rotatably connected to the two reinforcing bolts (403). Concentric shafts (406) are connected to the two linkage rods (404), and moving contacts are connected to the two concentric shafts (406). The moving contacts are an isolation moving contact (405) and a grounding moving contact (4051). The isolation moving contact (405) is located inside the second shaft cylinder (3002), and the grounding moving contact (4051) is located inside the first shaft cylinder (3001). A shaft hole (402) is provided on the surface of the transmission plate (401) for cooperating with the insulating shaft (104). The isolating moving contact (405) and the grounding moving contact (4051) are slidably sleeved in the steel back bearing (301).

8. The equalizing three-position disconnect switch for an environmentally friendly gas cabinet according to claim 7, characterized in that: The transmission plate (401) is configured in a fan shape, and the circular end of the transmission plate (401) does not contact the stationary contact seat (30). The reinforcing bolts (403) are symmetrically located at the arc end of the transmission plate (401).

9. A pressure-equalizing three-position disconnect switch for an environmentally friendly gas cabinet according to claim 8, characterized in that: The bottom ends of both the isolating moving contact (405) and the grounding moving contact (4051) are provided with path grooves (407).

10. A pressure-equalizing three-position disconnect switch for an environmentally friendly gas cabinet according to claim 9, characterized in that: The linkage rod (404) is arc-shaped on one side. When one of the isolating moving contact (405) and the grounding moving contact (4051) is in the closed position, the arc-shaped part of the linkage rod (404) will be concentric with the insulating shaft (104), and at the same time, the arc-shaped part of any linkage rod (404) will abut against the bottom of the arc head (303).

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