Indoor high-voltage vacuum circuit breaker

Abstract

The application provides an indoor high-voltage vacuum circuit breaker, comprising a vacuum device. The vacuum device is internally provided with a fixed terminal and a movable terminal, the movable terminal can move along a first axis, the first axis is a central axis of the vacuum device; a deformable structure is arranged between the fixed terminal and the movable terminal, one end of the deformable structure is in sliding connection with the fixed terminal, and the other end is in fixed connection with the movable terminal; the deformable structure and the inner wall of the vacuum device jointly enclose a first chamber, the deformable structure and the fixed terminal and the movable terminal jointly enclose a second chamber, and the deformable structure can be bent and deformed towards the inside of the second chamber. By arranging the deformable structure which can deform according to the pressure changes in the first chamber and the second chamber, the erosion time of the arc on the movable terminal and the fixed terminal is reduced, the arc extinguishing effect is enhanced, the required vacuum degree of the device is ensured, and the normal operation of the equipment is ensured.

Description

Technical Field

[0001] This invention relates to the technical field of high-voltage vacuum circuit breakers, and in particular to an indoor high-voltage vacuum circuit breaker. Background Technology

[0002] With the continuous development of power systems and increasing attention to the reliability of power equipment, there is a growing need for power protection equipment that can safely cut off current and protect equipment and personnel. This has led to the widespread application of high-voltage vacuum circuit breakers as an important type of power protection device. The working principle of a vacuum circuit breaker utilizes the characteristics of an electric arc in a vacuum environment. In high-voltage circuits, the electric arc cannot persist in a vacuum, thus achieving fast and effective switching control.

[0003] However, the internal vacuum level of existing vacuum circuit breakers is reduced due to manufacturing errors, and the vacuum level also gradually decreases due to prolonged mechanical movement during use. When the vacuum level is lower than the standard, the arc extinguishing effect in the vacuum chamber cannot be guaranteed. Moreover, existing vacuum circuit breakers may generate electric arcs during the opening process, causing the equipment to be corroded by the electric arc.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide an indoor high-voltage vacuum circuit breaker to address the problem that reduced vacuum levels in current vacuum circuit breakers affect arc extinguishing effectiveness and thus cause equipment corrosion.

[0006] The above objectives are achieved through the following technical solutions:

[0007] An indoor high-voltage vacuum circuit breaker includes a vacuum device. The vacuum device contains a fixed terminal and a movable terminal. The movable terminal is movable along a first axis, which is the central axis of the vacuum device. A deformable structure is provided between the fixed terminal and the movable terminal. One end of the deformable structure is slidably connected to the fixed terminal, and the other end is fixedly connected to the movable terminal. The deformable structure and the inner wall of the vacuum device together form a first chamber. The deformable structure, the fixed terminal, and the movable terminal together form a second chamber.

[0008] During the closing phase of the fixed terminal and the moving terminal, the first chamber and the second chamber are connected, and the pressure of the first chamber and the second chamber can be exchanged. During the opening phase of the fixed terminal and the moving terminal, the first chamber and the second chamber are not connected, and the deformable structure can be bent and deformed toward the interior of the second chamber.

[0009] In one embodiment, a valve is provided at the connection between the deformable structure and the fixed terminal. The valve is located at the communication between the first chamber and the second chamber and is used to restrict the flow of material in the first chamber to the second chamber.

[0010] In one embodiment, the valve is provided with a first damping structure, which limits the valve closing time to be later than the closing time.

[0011] In one embodiment, the valve is provided with a second damping structure, which keeps the valve closed during the opening phase of the fixed terminal and the moving terminal.

[0012] In one embodiment, the valve is configured as two valves, respectively disposed on both sides of the fixed terminal.

[0013] In one embodiment, the moving terminal is provided with a movable guide plate, which slides along the first axis and together with the moving terminal forms a receiving area, the receiving area being able to receive the substance discharged from the first chamber.

[0014] In one embodiment, the deformable structure is provided with a pressure relief valve. When the pressure in the first chamber does not exceed a preset value, the pressure relief valve restricts the first chamber from discharging substances to the external environment. When the pressure in the first chamber exceeds the preset value, the pressure relief valve no longer restricts the first chamber from discharging substances to the external environment.

[0015] In one embodiment, two pressure relief valves are provided, one on each side of the deformable structure.

[0016] In one embodiment, the movable guide plate is provided with a hose structure, one end of which is connected to the movable guide plate and the other end of which is connected to the pressure relief valve.

[0017] In one embodiment, the movable guide plate is provided with a connection channel that connects the hose structure to the external environment.

[0018] The beneficial effects of this invention are:

[0019] This invention provides an indoor high-voltage vacuum circuit breaker, comprising a vacuum device. The vacuum device contains a fixed terminal and a moving terminal, the moving terminal being movable along a first axis, which is the central axis of the vacuum device. A deformable structure is provided between the fixed and moving terminals, one end of which is slidably connected to the fixed terminal, and the other end is fixedly connected to the moving terminal. The deformable structure and the inner wall of the vacuum device together form a first chamber, and the deformable structure, together with the fixed and moving terminals, forms a second chamber. The deformable structure is capable of bending and deforming towards the interior of the second chamber. By providing a deformable structure that can deform according to pressure changes in the first and second chambers, the erosion time of the moving and fixed terminals by the electric arc is reduced, the arc extinguishing effect is enhanced, and the required vacuum level of the device is ensured, thus ensuring the normal operation of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an indoor high-voltage vacuum circuit breaker provided in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A schematic diagram of the vacuum device in an indoor high-voltage vacuum circuit breaker.

[0022] Figure 3 for Figure 2 Side view of an indoor high-voltage vacuum circuit breaker when the circuit is conducting.

[0023] Figure 4 for Figure 3 A cross-sectional view of section AA during the closing stage of the vacuum device in an indoor high-voltage vacuum circuit breaker.

[0024] Figure 5 for Figure 3 A cross-sectional view of the vacuum device in an indoor high-voltage vacuum circuit breaker when it is closed.

[0025] Figure 6 for Figure 3 A cross-sectional view of the vacuum device in an indoor high-voltage vacuum circuit breaker when it is tripped.

[0026] Figure 7 for Figure 3 Cross-sectional view of the first chamber of an indoor high-voltage vacuum circuit breaker during depressurization;

[0027] Figure 8 for Figure 7 A cross-sectional view of the first chamber of an indoor high-voltage vacuum circuit breaker depressurized to normal conditions;

[0028] Figure 9 for Figure 4 A partially enlarged schematic diagram of B in the indoor high-voltage vacuum circuit breaker;

[0029] Figure 10 for Figure 5 A partially enlarged schematic diagram of C in an indoor high-voltage vacuum circuit breaker;

[0030] Figure 11 for Figure 7 A partially enlarged schematic diagram of D in an indoor high-voltage vacuum circuit breaker;

[0031] Figure 12 for Figure 8 A partially enlarged schematic diagram of E in an indoor high-voltage vacuum circuit breaker.

[0032] in:

[0033] 100. External control power frame;

[0034] 200. Vacuum device; 201. Insulating outer layer; 202. Plum blossom contact; 210. Ceramic layer; 211. Isolation cover; 220. Fixed terminal; 221. Moving terminal; 230. One-way channel; 231. One-way valve; 240. Movable guide plate; 241. Connection channel; 250. Deformable structure; 251. Push block; 260. Mounting ring; 261. Valve; 262. Pressure relief valve; 263. Valve; 270. First compression spring; 271. Second compression spring; 280. Bellows; 281. Hose structure;

[0035] 300. First chamber;

[0036] 400. Second chamber. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0038] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0039] In this invention, 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," "over," and "on top" of 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.

[0040] The following reference Figures 1 to 12 This invention describes an indoor high-voltage vacuum circuit breaker provided by an embodiment of the present invention.

[0041] like Figures 1 to 3 As shown, the indoor high-voltage vacuum circuit breaker provided in this embodiment of the invention is particularly suitable for arc extinguishing in indoor high-voltage power systems, and can also be applied to arc extinguishing in other high-voltage operating conditions. Specifically, the indoor high-voltage vacuum circuit breaker includes an external control power frame 100, a vacuum device 200, and stylus contacts 202. The external control power frame 100 not only provides necessary support and power for the indoor high-voltage vacuum circuit breaker, but also works in conjunction with the vacuum device 200 to form the basic structure of the equipment. The stylus contacts 202 can effectively reduce contact resistance, ensure stable current transmission, and reduce heat generation. The vacuum device 200 effectively realizes the arc extinguishing function by creating a negative pressure environment of vacuum inside, ensuring that the circuit breaker can operate stably under high-voltage conditions. The vacuum device 200 is also equipped with an isolation cover 211 and a ceramic layer 210 inside, and has an insulating outer layer 201 outside. The three work together to maintain the vacuum environment and protect the internal components.

[0042] like Figures 4 to 7As shown, both the fixed terminal 220 and the moving terminal 221 are disposed inside the vacuum device 200. The moving terminal 221 moves along a first axis, which is the central axis of the vacuum device 200. A deformable structure 250 is provided between the fixed terminal 220 and the moving terminal 221. One end of the deformable structure 250 is slidably connected to the fixed terminal 220, and the other end is fixedly connected to the moving terminal 221. Specifically, the fixed terminal 220 is a contact point fixed inside the vacuum device 200, and the moving terminal 221 can move along the first axis to contact and separate from the fixed terminal 220 to realize the closing and opening operations of the circuit. The fixed terminal 220 and the moving terminal 221 together form a second chamber 400 through the deformable structure 250, and the deformable structure 250 and the isolation cover 211 together form a first chamber 300. The deformable structure 250 has the ability to adapt to pressure changes inside the first chamber 300 and the second chamber 400, and reduces the erosion time of the electric arc on the fixed terminal 220 and the moving terminal 221 through its own deformation. Before the fixed terminal 220 and the moving terminal 221 come into contact, the first chamber 300 and the second chamber 400 are connected, and both the first chamber 300 and the second chamber 400 are in a vacuum negative pressure state with equal pressure.

[0043] During the closing phase of the fixed terminal 220 and the moving terminal 221, the first chamber 300 and the second chamber 400 are connected, allowing for material exchange. During the opening phase of the fixed terminal 220 and the moving terminal 221, the first chamber 300 and the second chamber 400 are not connected, and the deformable structure 250 can bend and deform towards the interior of the second chamber 400. Specifically, during the closing process of the moving terminal 221 from the fixed terminal 220, because the first chamber 300 and the second chamber 400 are connected, the pressure in the first chamber 300 is equal to the pressure in the second chamber 400, and the deformable structure 250 is in a vertical state. When the moving terminal 221 comes into contact with the fixed terminal 220, the closing circuit is completed, and the first chamber 300 and the second chamber 400 are no longer connected.

[0044] During the opening phase of the circuit breaker, when the moving terminal 221 and the fixed terminal 220 are open, the first chamber 300 and the second chamber 400 are not connected, resulting in a decrease in pressure inside the second chamber 400 and creating a pressure difference between the first chamber 300 and the second chamber 400. The higher pressure in the first chamber 300 then exerts a compressive force on the second chamber 400, causing the deformable structure 250 to bend and deform inward into the second chamber 400. As the opening process continues, the pressure difference between the first chamber 300 and the second chamber 400 continues to increase, and the compressive force becomes increasingly greater, leading to an increase in the degree of bending of the deformable structure 250.

[0045] Therefore, during the tripping process, the pressure in the second chamber 400 gradually decreases and becomes lower than the pressure in the first chamber 300. This change increases the vacuum level in the second chamber 400, reduces the possibility of arc formation, and thus shortens the arc occurrence time between the moving terminal 221 and the fixed terminal 220, enhancing the arc extinguishing effect and ultimately extending the service life of the device. When the fixed terminal 220 and the moving terminal 221 reach their maximum distance, the first chamber 300 and the second chamber 400 become conductive, and the pressure in the first chamber 300 balances with the pressure in the second chamber 400. At this point, the deformable structure 250 returns to its vertical state.

[0046] In one embodiment, such as Figure 9 and Figure 10 As shown, a valve 261 is installed between the deformable structure 250 and the fixed terminal 220. The valve 261 is located at the connection between the first chamber 300 and the second chamber 400, and restricts the flow of material in the first chamber 300 to the second chamber 400. Specifically, a push block 251 is provided on the deformable structure 250. When the distance between the moving terminal 221 and the fixed terminal 220 reaches its maximum, the push block 251 connects with the valve 261, pushing the valve 261 to slide downward (i.e., Figure 9 The moving terminal 221 moves towards the fixed terminal 220, thereby opening valve 261 and connecting the first chamber 300 and the second chamber 400, making the pressure in the first chamber 300 and the second chamber 400 equal. During the movement of the moving terminal 221 towards the fixed terminal 220, although the push block 251 does not continuously abut against valve 261, valve 261 closes slowly during this process. This keeps the first chamber 300 and the second chamber 400 connected and maintains the same pressure throughout the process. This is done to prevent valve 261 from closing prematurely, which could affect the pressure balance between the first chamber 300 and the second chamber 400, preventing the moving terminal 221 from successfully contacting the fixed terminal 220.

[0047] Furthermore, during the separation of the moving terminal 221 and the fixed terminal 220, the valve 261 closes to prevent the first chamber 300 and the second chamber 400 from communicating, thereby ensuring that the necessary pressure difference can be formed between the first chamber 300 and the second chamber 400. Also, the interior of the ceramic layer 210 is in a vacuum state, and the valve 261 ensures that the interior of the second chamber 400 is always kept in a vacuum state.

[0048] Furthermore, the vacuum device 200 is also equipped with a valve 263 and a mounting ring 260. The valve 263 and valve 261 are installed inside the mounting ring 260 to ensure that the parts can work normally without damage. The valve 263 and valve 261 cooperate with each other to control the connection or disconnection of the first chamber 300 and the second chamber 400.

[0049] In one embodiment, valve 261 is provided with a first damping structure to limit the closing time of valve 261 to be later than the closing time. Specifically, the first damping structure is disposed between valve 263 and valve 261, and this first damping structure is a first compression spring 270. During the closing process, the push block 251 does not directly act on valve 261. At this time, the first compression spring 270 is used to control valve 261 to slide slowly and in a controlled manner, thereby keeping valve 263 open throughout the closing process, ensuring that the first chamber 300 and the second chamber 400 remain connected and maintain the same pressure during this process. Therefore, the first compression spring 270 avoids the risk that premature closure of valve 263 may disrupt the pressure balance between the first chamber 300 and the second chamber 400, thus affecting the smooth closing process.

[0050] Furthermore, such as Figure 11 As shown, valve 261 is equipped with a second damping structure. During the opening phase of the fixed terminal 220 and the moving terminal 221, the second damping structure keeps valve 261 closed. Specifically, the second damping structure acts on valve 261 and valve 263, and this second damping structure is a second compression spring 271. During the opening phase, the force applied by the second compression spring 271 is greater than the force generated by the pressure difference, thereby causing the second compression spring 271 to apply upward force to valve 263 and valve 261 (i.e.,...). Figure 11 The force (in the vertical direction) prevents valves 263 and 261 from sliding relative to each other, ensuring that valve 261 remains closed. This ensures that the pressure difference between the first chamber 300 and the second chamber 400 is maintained during the opening process, causing the deformable structure 250 to bend, thereby reducing the time that the electric arc generated between the moving terminal 221 and the stationary terminal 220 erodes the two terminals.

[0051] In particular, such as Figure 8 and Figure 12 As shown, when the vacuum pressure in the first chamber 300 is leaked to normal pressure during the closing process, the second spring 271 will be compressed due to the pressure difference between the first chamber 300 and the second chamber 400. This causes valves 261 and 263 to move downwards synchronously (i.e.,...). Figure 12 The moving part 251 moves vertically, thus rendering the push block 251 ineffective against valve 261. Valve 263 then closes, effectively blocking the connection between the first chamber 300 and the second chamber 400, ensuring a vacuum negative pressure state is maintained inside the second chamber 400. Simultaneously, the pressure difference causes the deformable structure 250 to bend inwards into the second chamber 400. During the movement of the moving terminal 221 towards the fixed terminal 220, the deformable structure 250 gradually bends and forms an insulating layer between the fixed terminal 220 and the moving terminal 221, preventing accidental conduction and ensuring safe operation.

[0052] In a further embodiment, two valves 261 are configured, one on each side of the fixed terminal 220. Specifically, two valves 263 can also be configured. By having two valves 263 and two valves 261 work together, multiple gas flow paths are provided, enabling a more rapid balance of pressure between the first chamber 300 and the second chamber 400. During the opening and closing processes, the multiple configurations of valves 263 and 261 help to distribute the load and pressure, reducing the burden on individual components.

[0053] Furthermore, the arrangement of multiple valves 263 and 261 allows for more precise gas flow control and pressure regulation. Adjusting each valve 261 and 263 according to different states of the vacuum device 200 maintains the optimal negative pressure within the second chamber 400, thereby improving arc extinguishing efficiency and enhancing equipment safety.

[0054] In one embodiment, such as Figure 1 As shown, a movable guide plate 240 is also provided on the movable terminal 221. The movable guide plate 240 slides along the first axis and together with the movable terminal 221 forms a receiving area, which can accommodate the substance discharged from the first chamber 300. Specifically, the movable guide plate 240 is located at one end near the movable terminal 221 of the first chamber 300. When a pressure difference occurs between the first chamber 300 and the second chamber 400, the movable guide plate 240 can adapt to the pressure change and slide along the first axis, thereby forming a receiving area together with the movable terminal 221. The gas in the first chamber 300 will be discharged into the receiving area and then discharged into the external environment.

[0055] In one embodiment, such as Figure 10 As shown, the deformable structure 250 is equipped with a pressure relief valve 262. When the pressure inside the first chamber 300 does not exceed a preset value, the pressure relief valve 262 restricts the discharge of substances from the first chamber 300 to the external environment. When the pressure inside the first chamber 300 exceeds the preset value, the pressure relief valve 262 no longer restricts the discharge of substances from the first chamber 300 to the external environment. Specifically, the pressure relief valve 262 is located on the side of the deformable structure 250 near the moving terminal 221. The main function of the pressure relief valve 262 is to discharge gas from the first chamber 300 to balance the pressure of the first chamber 300 and ensure that its pressure is not lower than the preset value. During the closing phase, the pressure relief valve 262 remains closed. During the tripping phase, the pressure difference between the first chamber 300 and the second chamber 400 causes the pressure relief valve 262 to open. The pressure relief valve 262 only allows the gas in the first chamber 300 to be discharged from the device, thereby gradually reducing its pressure and ensuring that the pressure of the first chamber 300 is not lower than the preset value, so that there is a pressure difference between the first chamber 300 and the second chamber 400.

[0056] Furthermore, two pressure relief valves 262 are configured, one on each side of the deformable structure 250. Specifically, the two pressure relief valves 262 are located on both sides of the deformable structure 250 near the moving terminal 221. By configuring the pressure relief valves 262 in multiple locations, adjustment from different angles is possible, thereby improving the accuracy of pressure control.

[0057] In one embodiment, the movable guide plate 240 is provided with a hose structure 281. One end of the hose structure 281 is connected to the movable guide plate 240, and the other end is connected to a pressure relief valve 262. Specifically, when a pressure difference occurs between the first chamber 300 and the second chamber 400, the pressure relief valve 262 will open. Since the movable guide plate 240 and the pressure relief valve 262 are connected by the hose structure 281, the gas in the first chamber 300 is discharged into the movable guide plate 240 through the hose structure 281 to balance the excessive pressure difference between the first chamber 300 and the second chamber 400 and to keep the pressure in the first chamber 300 from falling below a preset value. This causes the movable guide plate 240 to slide along the first axis, thereby forming a suitable receiving area between the movable guide plate 240 and the moving terminal 221.

[0058] Furthermore, to better balance the pressure within the first chamber 300, the vacuum device 200 is also equipped with a bellows 280, which maintains a constant pressure. A one-way channel 230 is also provided on the moving terminal 221, and the bellows 280 is connected to the gap between the movable guide plate 240 and the moving terminal 221 through the one-way channel 230. A one-way valve 231 is provided within the one-way channel 230 to ensure that gas can only flow from the movable guide plate 240 to the bellows 280. Therefore, when gas from the first chamber 300 flows into the movable guide plate 240, it will flow through the one-way channel 230 to the bellows 280. This process not only balances the pressure within the first chamber 300 but also maintains a vacuum negative pressure state within the first chamber 300.

[0059] In one embodiment, such as Figures 4 to 12 As shown, the movable guide plate 240 is provided with a connecting channel 241, which connects to the hose structure 281 and links the hose structure 281 to the external environment. Specifically, the connecting channel 241 is located inside the movable guide plate 240, with one end connected to the hose structure 281 and the other end communicating with the one-way channel 230. Gas discharged from the first chamber 300 enters the one-way channel 230 through the connecting channel 241 and eventually flows into the external environment of the bellows 280. In addition, a one-way valve 231 is provided in the one-way channel 230. This one-way valve 231 only allows gas to flow from the inside of the device to the outside, effectively preventing external gas from flowing back in, thereby protecting the vacuum environment of the first chamber 300 and the second chamber 400.

[0060] Furthermore, two connecting channels 241 can be configured, respectively located at both ends of the movable guide plate 240. Two hose structures 281 can also be configured, respectively located at both ends of the movable guide plate 240. Therefore, the arrangement of multiple connecting channels 241 and hose structures 281 can provide more gas flow paths, thereby accelerating the pressure balance within the first chamber 300 and better maintaining the vacuum negative pressure state within the first chamber 300.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An indoor high-voltage vacuum circuit breaker, characterized in that, include: A vacuum device is provided inside, comprising a fixed terminal and a movable terminal. The movable terminal is movable along a first axis, which is the central axis of the vacuum device. A deformable structure is provided between the fixed terminal and the movable terminal. One end of the deformable structure is slidably connected to the fixed terminal, and the other end is fixedly connected to the movable terminal. The deformable structure and the inner wall of the vacuum device together form a first chamber, and the deformable structure, the fixed terminal, and the movable terminal together form a second chamber. During the closing phase of the fixed terminal and the moving terminal, the first chamber is connected to the second chamber, and the pressure of the first chamber and the second chamber can be exchanged. During the opening phase of the fixed terminal and the moving terminal, the first chamber and the second chamber are not connected, and the deformable structure can be bent and deformed toward the interior of the second chamber; A valve is provided at the connection between the deformable structure and the fixed terminal. The valve is located at the connection between the first chamber and the second chamber and is used to restrict the flow of material in the first chamber to the second chamber. A push block is provided on the deformable structure, and the valve is provided with a first damping structure and a second damping structure. When the distance between the moving terminal and the fixed terminal reaches its maximum, the push block connects to the valve and pushes the valve downward to open the valve and connect the first chamber and the second chamber. During the closing process of the moving terminal moving towards the fixed terminal, the first damping structure controls the valve to slide slowly and in a controlled manner, keeping the first chamber and the second chamber connected and maintaining the same pressure during this process. The first damping structure is used to limit the valve closing time to be later than the closing time. During the opening process of the moving terminal separating from the fixed terminal, the second damping structure keeps the valve closed to prevent the first chamber and the second chamber from connecting, thereby ensuring that a pressure difference is maintained between the first chamber and the second chamber.

2. The indoor high-voltage vacuum circuit breaker according to claim 1, characterized in that, The valve is configured as two valves, which are respectively located on both sides of the fixed terminal.

3. The indoor high-voltage vacuum circuit breaker according to claim 1, characterized in that, The moving terminal is provided with a movable guide plate, which slides along the first axis and together with the moving terminal forms a receiving area, which can accommodate the substance discharged from the first chamber.

4. The indoor high-voltage vacuum circuit breaker according to claim 3, characterized in that, The deformable structure is equipped with a pressure relief valve. When the pressure in the first chamber does not exceed a preset value, the pressure relief valve restricts the discharge of substances from the first chamber to the external environment. When the pressure in the first chamber exceeds the preset value, the pressure relief valve no longer restricts the discharge of substances from the first chamber to the external environment.

5. The indoor high-voltage vacuum circuit breaker according to claim 4, characterized in that, Two pressure relief valves are provided, one on each side of the deformable structure.

6. The indoor high-voltage vacuum circuit breaker according to claim 5, characterized in that, The movable guide plate is provided with a hose structure, one end of which is connected to the movable guide plate and the other end of which is connected to the pressure relief valve.

7. The indoor high-voltage vacuum circuit breaker according to claim 6, characterized in that, The movable guide plate is provided with a connection channel, which connects the hose structure to the external environment.

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