A vacuum circuit breaker

Abstract

The application discloses a vacuum circuit breaker, and particularly relates to the technical field of circuit breakers, which comprises a shell, a main shaft, an opening and closing mechanism, an energy storage mechanism and a protection mechanism, wherein the protection mechanism comprises a swing rod hinged to the bottom of the shell, the other end of the swing rod is connected with the main shaft, the swing rod is provided with a sleeve-wrapped sliding block, an elastic element is arranged between the sliding block and the hinged point of the swing rod, a cylindrical block is fixed outside the sleeve, a guide plate is arranged in the shell and is symmetrically inclined, and the cylindrical block is in surface contact with the guide plate to form a sliding pair. The protection mechanism can greatly shorten the existence time of the electric arc, the shorter the duration of the electric arc, the smaller the erosion of the contact, the service life of the vacuum arc-extinguishing chamber can be effectively prolonged, the negative influence of long-term vibration on the internal parts can be reduced, the problems of loosening, wear and failure of the parts can be solved, and the service life of the key parts of the vacuum circuit breaker can be further prolonged.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more specifically, to a vacuum circuit breaker. Background Technology

[0002] Vacuum circuit breakers are named for their high-vacuum nature, which is both the arc-extinguishing medium and the insulating medium between the contacts after arc extinguishing. They are characterized by their small size, light weight, suitability for frequent operation, and maintenance-free arc extinguishing, making them widely used in power distribution networks. Vacuum circuit breakers are indoor power distribution devices in 3-10kV, 50Hz three-phase AC systems, used in industrial and mining enterprises, power plants, and substations for the protection and control of electrical equipment. They are particularly suitable for applications requiring oil-free operation, minimal maintenance, and frequent operation. Circuit breakers can be installed in medium-voltage switchgear, double-layer switchgear, and fixed switchgear for the control and protection of high-voltage electrical equipment.

[0003] In practical applications, the drive mechanism of a vacuum circuit breaker achieves rapid opening and closing of contacts through precise control, effectively shortening the arc duration and reducing thermal erosion and electrolytic wear. However, the relatively large force of the drive mechanism has two major drawbacks: First, the violent collision of contacts can easily cause surface damage, wear, dents, or even breakage, leading to decreased conductivity, reduced contact reliability, increased resistance, localized overheating, and the risk of electrical faults; Second, mechanical impact will be transmitted to the entire structure, and long-term vibration will accelerate the loosening, wear, and failure of internal parts, ultimately shortening the service life of the equipment.

[0004] For example, Chinese patent application number 202411975492.6 discloses a high-voltage vacuum circuit breaker opening and closing drive mechanism, belonging to the field of circuit breaker technology. It includes a housing and a vacuum chamber, with multiple sets of vacuum chambers mounted on the housing; wiring ports fixedly mounted on the side surface of the vacuum chambers, with two sets of wiring ports installed on each set of vacuum chambers, arranged vertically; a conductive plate installed inside the wiring ports, with one end extending into the vacuum chamber; and a first conductive post, the upper end of which is fixedly connected to the upper set of conductive plates. This invention enables a fast initial speed during closing or opening, followed by a slower speed. During opening and closing operations, the rapid initial speed and dynamic change effectively reduce arc generation, while the slower speed avoids excessive impact on the overall structure of the circuit breaker due to excessively fast opening and closing speeds.

[0005] Although the application document adds a buffer structure, which can reduce the impact caused by the drive mechanism to a certain extent, it cannot further reduce the speed at which the stationary and moving contacts separate or break in the vacuum interrupter. The arc may cause damage to the stationary and moving contacts if it exists for too long.

[0006] To address these issues, the present invention proposes a vacuum circuit breaker. Summary of the Invention

[0007] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a vacuum circuit breaker, which solves the problems mentioned in the background art by setting a protection mechanism.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a vacuum circuit breaker, comprising a housing, a main shaft, an opening and closing mechanism, and an energy storage mechanism, and further comprising:

[0009] The protective mechanism includes a swing arm hinged to the bottom of the housing, the other end of which is connected to the main shaft, realizing the motion conversion from the rotation of the main shaft to the swing of the swing arm;

[0010] The swing arm is provided with a sleeve, and a slider that passes through the swing arm is provided inside the sleeve. An elastic element is provided between the slider and the hinge point of the swing arm. A cylindrical block is fixed outside the sleeve, and a guide plate that is symmetrically inclined is provided inside the outer shell. The cylindrical block and the surface of the guide plate are in contact to form a sliding pair.

[0011] Preferably, the upper and lower parts of the guide plate are symmetrically inclined, and the connection adopts a rounded transition structure.

[0012] Preferably, the elastic element is a compression spring, the direction of which is always coincident with the axis of the rocker arm, and the inner wall of the sleeve is provided with a linear slide rail that cooperates with the rocker arm.

[0013] Preferably, the opening and closing mechanism further includes an opening assembly. The opening and closing mechanism includes a crank arm movably disposed at the bottom of the housing. One end of the crank arm is controlled to swing up and down by a main shaft, and the other end is connected to a vacuum interrupter to realize the control of closing and opening.

[0014] Preferably, the opening and closing mechanism further includes an opening spring disposed at one end of the crank arm, and the main shaft is provided with an opening lever for locking the potential energy of the opening spring.

[0015] Preferably, the energy storage mechanism includes an energy storage spring and an energy storage crank shaft. The energy storage crank shaft adopts an automatic energy storage mode driven by a motor and an emergency energy storage mode driven by a handle. The motor is controlled to start and stop via a micro switch.

[0016] Preferably, the housing is equipped with a counter that is linked to the crank arm to record the number of opening and closing operations of the vacuum circuit breaker.

[0017] Preferably, the housing is provided with an opening / closing indicator and an energy storage indicator. The opening / closing indicator is mechanically linked with the main shaft to display the opening / closing status, and the energy storage indicator is linked with the energy storage spring to display the energy storage status.

[0018] The technical effects and advantages of this invention are as follows:

[0019] 1. This invention features two energy storage methods: motor-driven and manual-driven. The motor drives a crankshaft for automatic energy storage, with its start and stop controlled by a micro-motion mechanism. A handle is also provided for manual operation of the energy storage crankshaft when the control circuit is out of power. Closing and opening operations are controlled by signals output from the control circuit, which in turn control the closing and opening coils, driving the interlocking mechanism to precisely control the vacuum interrupter's operation. This enables remote and simple operation, ensuring reliable circuit switching. Furthermore, the energy storage function of the energy storage spring allows the vacuum circuit breaker to close quickly, improving response speed and enhancing power system stability.

[0020] 2. This invention achieves intelligent monitoring and stability improvement of the vacuum circuit breaker's operating status by integrating a counter, status indicator components, and a mechanical locking mechanism. The counter accurately records the number of opening and closing operations, providing data support for equipment maintenance; the opening / closing indicator and energy storage indicator simultaneously display the on / off and energy storage status, facilitating real-time monitoring of operating parameters by maintenance personnel; and the matching opening lever locks the potential energy stored in the opening spring during the closed state, maintaining stable contact between the moving and stationary contacts. This design, through dual protection of status visualization and mechanical self-locking, significantly improves the equipment's operational reliability and maintainability.

[0021] 3. This invention incorporates a protective mechanism. Its core guide plate features a symmetrical and inclined design. During the opening or closing operation of the vacuum circuit breaker, the elastic element releases pre-stored elastic potential energy, providing additional driving force for the main shaft rotation, accelerating its rotation and causing the moving and stationary contacts within the vacuum interrupter to separate rapidly, significantly shortening the arc duration. A shorter arc duration results in less erosion of the contacts, effectively extending the lifespan of the vacuum interrupter. The contraction of the elastic element generates a counterforce, which buffers subsequent main shaft rotation, preventing excessive mechanical impact due to inertia. This buffering mechanism reduces the negative impact of long-term vibration on internal components, alleviating issues such as component loosening, wear, and failure, further extending the service life of key components of the vacuum circuit breaker. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a rear view of the overall structure of the present invention with part of the outer shell removed.

[0024] Figure 3 This is a schematic diagram of the left-side cross-section of the present invention.

[0025] Figure 4 This is a right-side view schematic diagram of the present invention cut along the end face of the cam.

[0026] Figure 5This is a right-side view of the invention, cut along the end face of the gate opener.

[0027] Figure 6 This is a right-side view of the invention, cut along the end face of the handle.

[0028] Figure 7 This is a schematic diagram of the protective mechanism in this invention.

[0029] Figure 8 This is a cross-sectional schematic diagram of the protection mechanism in this invention.

[0030] The attached figures are labeled as follows:

[0031] 1. Outer shell;

[0032] 2. Spindle;

[0033] 3. Opening and closing mechanism; 301. Crank arm; 302. Closing assembly; 3021. Pressure plate; 3022. Connecting rod; 3023. Cam; 3024. Needle roller bearing; 3025. First interlocking mechanism; 3026. Closing coil; 303. Opening assembly; 3031. Opening spring; 3032. Opening lever; 3033. Second interlocking mechanism; 3034. Opening coil;

[0034] 4. Energy storage mechanism; 401. Energy storage spring; 402. Energy storage crankshaft;

[0035] 5. Protective mechanism; 501. Swing rod; 502. Moving part; 5021. Sleeve; 5022. Slider; 5023. Elastic element; 5024. Cylindrical block; 5025. Guide plate;

[0036] 6. Micro switch; 7. Motor; 8. Counter; 9. Open / close indicator; 10. Energy storage indicator; 11. Handle. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] Please see Figures 1 to 8 As shown, the vacuum circuit breaker in this embodiment of the invention includes a housing 1 and a main shaft 2, the main shaft 2 being rotatably disposed within the housing 1, and also includes an opening and closing mechanism 3 and an energy storage mechanism 4.

[0040] Please see Figure 1 and Figure 2 As shown, the opening and closing mechanism 3 includes a crank arm 301 movably disposed at the bottom of the housing 1. One end of the crank arm 301 is controlled to swing up and down via the main shaft 2, and the other end is connected to the vacuum interrupter to realize the control of closing and opening; combined with Figure 3 As shown, the energy storage mechanism 4 includes an energy storage spring 401 and an energy storage crankshaft 402. One end of the energy storage spring 401 is connected to the top of the outer casing 1, and the other end is connected to the end of the energy storage crankshaft 402. The energy storage spring 401 is used to store energy and realize fast closing.

[0041] Specifically, the vacuum interrupter is equipped with a moving contact and a stationary contact. The end of the crank arm 301 is connected to the moving contact in the vacuum interrupter. When the crank arm 301 swings up and down, it drives the moving contact to move up and down, controlling the moving contact and the stationary contact to separate or contact, thereby realizing the control of closing and opening.

[0042] Please see Figure 3 and Figure 4 As shown, the opening and closing mechanism 3 also includes a closing assembly 302. The closing assembly 302 includes a pressure plate 3021 disposed on the main shaft 2. A connecting rod 3022 is hinged to the end of the pressure plate 3021 away from the main shaft 2. The free end of the connecting rod 3022 is hinged to the end of the crank arm 301 near the main shaft 2.

[0043] Please see Figure 2 and Figure 4 As shown, the closing assembly 302 also includes a cam 3023 disposed on the energy storage crankshaft 402, a needle roller bearing 3024 that contacts the outer surface of the cam 3023 is disposed on the other end of the pressure plate 3021 away from the main shaft 2, a first interlocking mechanism 3025 that is hinged to the cam 3023 is disposed inside the housing 1, and a closing coil 3026 for driving the first interlocking mechanism 3025 to operate is disposed inside the housing 1.

[0044] Specifically, after receiving the closing signal, the closing coil 3026 starts to work. The output of the closing coil 3026 drives the first interlocking mechanism 3025 to operate, and the first interlocking mechanism 3025 releases the limit on the cam 3023.

[0045] Please see Figure 2 and Figure 5 As shown, the opening and closing mechanism 3 also includes an opening assembly 303, which includes an opening spring 3031. One end of the opening spring 3031 is connected to one end of the crank arm 301 near the main shaft 2, and the other end is connected to the bottom of the housing 1. The main shaft 2 is provided with an opening lever 3032, which is used to lock the opening spring 3031. The housing 1 is provided with a second interlocking mechanism 3033 for driving the opening lever 3032 to swing. The housing 1 is provided with an opening coil 3034 for driving the second interlocking mechanism 3033 to operate.

[0046] Specifically, after receiving the opening signal, the gate opening coil 3034 starts to work. The output end of the gate opening coil 3034 drives the second interlocking mechanism 3033 to operate. The second interlocking mechanism 3033 drives the gate opening lever 3032 to swing, releasing the limit on the main shaft 2, and thus releasing the lock on the gate opening spring 3031.

[0047] Please see Figure 1 and Figure 6 As shown, the housing 1 is equipped with a micro switch 6 and a motor 7. The energy storage crank 402 adopts an automatic energy storage mode driven by the motor 7 and an emergency energy storage mode manually driven by the handle 11. The motor 7 is controlled to start and stop by the micro switch 6.

[0048] It should be noted that both the micro switch 6 and the motor 7 are existing technologies. When the button of the micro switch 6 is pressed, the motor 7 is powered on and starts to rotate. When the button of the micro switch 6 is released, the motor 7 is powered off and stops rotating. Their structure will not be described in detail here.

[0049] Please see Figure 1 As shown, the housing 1 is equipped with a counter 8 that is linked to the crank arm 301 to record the number of opening and closing operations of the vacuum circuit breaker. The counter 8 counts once for each closing and opening operation of the crank arm 301.

[0050] Please see Figure 1 and Figure 3 As shown, the outer casing 1 is equipped with an opening / closing indicator 9 and an energy storage indicator 10. The opening / closing indicator 9 is mechanically linked with the main shaft 2 to display the opening / closing status, and the energy storage indicator 10 is linked with the energy storage spring 401 to display the energy storage status.

[0051] It should be noted that the counter 8, the opening and closing indicator 9, and the energy storage indicator 10 are all existing technologies. The counter 8 is used to count the number of times the vacuum circuit breaker is opened and closed, the opening and closing indicator 9 is used to display the current status of the vacuum circuit breaker, and the energy storage indicator 10 is used to display the energy storage status of the energy storage spring 401. Their specific structures will not be described in detail here.

[0052] When in use, the free end of the crank arm 301 needs to be connected to the moving contact of the vacuum interrupter, and then the vacuum circuit breaker is connected to the control circuit in the electrical cabinet. In the initial state, the energy storage spring 401 is set to be in the stretched state. At this time, the vacuum circuit breaker is in the energy storage and open state. The open / close indicator 9 shows that the circuit is open, and the energy storage indicator 10 shows that the circuit is stored.

[0053] When the vacuum circuit breaker needs to be closed, the control circuit outputs a closing signal, which is transmitted to the closing coil 3026. The output end of the closing coil 3026 extends and triggers the first interlocking mechanism 3025 to operate, causing the first interlocking mechanism 3025 to release the limit on the cam 3023. At this time, the cam 3023 and the energy storage crankshaft 402 can rotate freely. The tension generated by the stretching of the energy storage spring 401 drives the energy storage crankshaft 402 to rotate. The energy storage crankshaft 402 drives the cam 3023 to swing downward. The cam 3023 presses the needle roller bearing 3024 downward. The needle roller bearing 3024 drives the pressure plate 3021 to swing downward. The pressure plate 3021 drives the main shaft 2 to rotate.

[0054] Simultaneously, the pressure plate 3021 drives the connecting rod 3022 to move downward, and the connecting rod 3022 drives the end of the crank arm 301 near the main shaft 2 to swing downward. The crank arm 301 begins to compress the opening spring 3031 downward, while the end of the crank arm 301 away from the main shaft 2 begins to swing upward. The crank arm 301 drives the moving contact of the vacuum interrupter connected to it to move upward, so that the moving contact of the vacuum interrupter contacts the stationary contact. The vacuum circuit breaker is in the closed state, the circuit is connected, the opening and closing indicator 9 switches to the closed display, the energy storage indicator 10 switches to the no energy storage display, the opening lever 3032 swings and locks the main shaft 2, so that the stationary contact and the moving contact in the vacuum interrupter remain in contact, and the opening spring 3031 is in a compressed state.

[0055] When the vacuum circuit breaker needs to be opened, the control circuit outputs an opening signal, which is transmitted to the opening coil 3034. The output end of the opening coil 3034 extends and triggers the second interlocking mechanism 3033 to operate. The second interlocking mechanism 3033 drives the opening lever 3032 to swing, releasing the limit on the main shaft 2. The elastic force generated by the compression of the opening spring 3031 drives the crank arm 301 near the main shaft 2 to swing upward, while the end of the crank arm 301 away from the main shaft 2 begins to swing downward, causing the moving contact in the vacuum interrupter to move downward. The moving contact separates from the stationary contact. Since both the moving and stationary contacts are in the vacuum environment inside the vacuum interrupter, the generation of electric arc can be suppressed during the separation process. The vacuum circuit breaker is in the open state, and the opening / closing indicator 9 switches to the open display. The counter 8 counts once, which makes it easy for staff to know the number of times the vacuum circuit breaker has been used. When the counter 8 reaches a certain number of times, the staff can perform maintenance on the vacuum circuit breaker.

[0056] After the vacuum circuit breaker is in the open state, the control circuit outputs an electrical signal, which acts on the micro switch 6. When the button of the micro switch 6 is pressed, the motor 7 starts to work. The output of the motor 7 drives the energy storage shaft 402 to rotate. The energy storage shaft 402 stretches the energy storage spring 401, and the elastic force of the energy storage spring 401 gradually increases. When the elastic force stored in the energy storage spring 401 reaches the preset value, the energy storage indicator 10 switches to the energy storage display to facilitate the rapid closing of the vacuum circuit breaker next time.

[0057] When the control circuit lacks power, the operator can also manually store energy by rotating the energy storage shaft 402 through the handle 11. A one-way bearing can be set at the rotation connection point between the handle 11 and the outer casing 1, so that the operator can pull the handle 11 back and forth to drive the energy storage shaft 402 to rotate unidirectionally in the direction of the tension energy storage spring 401, which is convenient for the operator to use.

[0058] Example 2

[0059] In practical use, it was found that when the vacuum circuit breaker is closing and opening, the energy storage spring 401 and the opening spring 3031 exert a large force to drive the various components, and the lack of a buffer structure makes it easy for these components to collide with other components in the vacuum circuit breaker, which can easily cause damage and reduce the service life of the vacuum circuit breaker. Although some existing circuit breakers have added a buffer structure, they cannot reduce the speed at which the stationary and moving contacts separate or open in the vacuum interrupter. The arc can easily damage the stationary and moving contacts if it exists for too long. Further improvements have been made based on the above embodiments.

[0060] Please see Figure 2 and Figure 6 and Figure 7 As shown, the protection mechanism 5 includes a rocker arm 501. One end of the rocker arm 501 is hinged to the bottom of the housing 1, and the other end is connected to the main shaft 2. The rocker arm 501 is provided with a movable part 502. When the vacuum circuit breaker is closed or opened, the movable part 502 can make the main shaft 2 rotate faster and then slower.

[0061] Please see Figure 7 and Figure 8 As shown, the movable part 502 includes a sleeve 5021 sleeved on the rocker arm 501. A slider 5022 that passes through the rocker arm 501 is provided inside the sleeve 5021. An elastic element 5023 is provided between the end of the rocker arm 501 that is hinged to the outer shell 1 and the slider 5022. A cylindrical block 5024 is provided outside the sleeve 5021. A guide plate 5025 is provided inside the outer shell 1. The upper and lower parts of the guide plate 5025 are inclined and symmetrical to each other. The cylindrical block 5024 and the surface of the guide plate 5025 are in contact to form a sliding pair.

[0062] Please refer to Figure 8 As shown, the elastic element 5023 is a compression spring, and its preload direction always coincides with the axis of the rocker arm 501. The inner wall of the sleeve 5021 is provided with a linear slide rail that cooperates with the rocker arm 501.

[0063] Please see Figure 7 As shown, the upper and lower parts of the guide plate 5025 are tilted at symmetrical angles, and the connection adopts a rounded transition structure.

[0064] Based on the above embodiments, in the initial state of use, the cylindrical block 5024 is in contact with the lower part of the guide plate 5025, and the angle between the swing rod 501 and the lower part of the guide plate 5025 is an acute angle. When the control circuit sends a closing signal, the energy storage spring 401 drives the main shaft 2 to rotate. When the main shaft 2 rotates, it will pull the swing rod 501 to swing upward. The elastic element 5023 always applies elastic force to the slider 5022, and the direction of the elastic force is always consistent with the length direction of the swing rod 501.

[0065] The cylindrical block 5024 slides upward along the inclined surface at the bottom of the guide plate 5025. The distance between the cylindrical block 5024 and the hinge point between the rocker arm 501 and the outer shell 1 gradually increases. The sleeve 5021 and the slider 5022 slide along the length of the rocker arm 501. The elastic element 5023 tends to drive the rocker arm 501 to swing upward. The elastic element 5023 gradually extends. At this time, the elastic force of the elastic element 5023 drives the rocker arm 501 to swing upward, which can accelerate the upward swing speed of the rocker arm 501. The force of the elastic element 5023 driving the rocker arm 501 to swing upward finally acts on the main shaft 2, which coincides with the rotation direction of the main shaft 2. This can accelerate the rotation speed of the main shaft 2, thereby accelerating the contact speed between the moving contact and the stationary contact in the vacuum interrupter, reducing the duration of arc generation, reducing the consumption rate of the moving and stationary contact materials by the arc, and thus extending the service life of the vacuum interrupter.

[0066] When the cylindrical block 5024 passes the connection between the upper and lower parts of the guide plate 5025, the cylindrical block 5024 can smoothly reach the upper part of the guide plate 5025 due to the arc transition at the connection. At this time, the rocker arm 501 continues to swing upward, and the cylindrical block 5024 moves upward along the inclined surface of the upper part of the guide plate 5025. The sleeve 5021 and the slider 5022 slide towards the hinge point between the rocker arm 501 and the outer shell 1. The elastic element 5023 has a tendency to drive the rocker arm 501 to swing downward. The elastic element 5023 gradually shortens. At this time, the elastic force of the elastic element 5023 acts as the resistance to the upward swing of the rocker arm 501. This resistance is finally transmitted to the main shaft 2, which can reduce the rotation speed of the main shaft 2, reduce the collision force of each component, and play the role of buffering mechanical impact.

[0067] When the vacuum circuit breaker opens, the main shaft 2 drives the rocker arm 501 to swing from top to bottom, and the cylindrical block 5024 moves from the upper part to the lower part of the guide plate 5025. This achieves the effect of first increasing and then decreasing the rotation speed of the main shaft 2. Increasing the rotation speed of the main shaft 2 can speed up the separation speed of the stationary and moving contacts in the vacuum interrupter, thereby reducing the duration of arc generation and reducing the rate at which the arc consumes the materials of the moving and stationary contacts. Decreasing the rotation speed of the main shaft 2 can buffer the mechanical impact, which is beneficial to extending the service life of various components in the vacuum circuit breaker.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vacuum circuit breaker, comprising a housing (1), a main shaft (2), an opening and closing mechanism (3), and an energy storage mechanism (4), characterized in that, Also includes: The protective mechanism (5) includes a swing arm (501) hinged to the bottom of the housing (1), the other end of which is connected to the main shaft (2) to realize the motion conversion from the rotation of the main shaft (2) to the swing of the swing arm (501); The swing arm (501) is provided with a sleeve (5021), and a slider (5022) that passes through the swing arm (501) is provided inside the sleeve (5021). An elastic element (5023) is provided between the slider (5022) and the hinge point of the swing arm (501). A cylindrical block (5024) is fixed outside the sleeve (5021). A guide plate (5025) with symmetrical inclination is provided inside the outer shell (1). The cylindrical block (5024) and the surface of the guide plate (5025) are in contact to form a sliding pair.

2. The vacuum circuit breaker according to claim 1, characterized in that, The guide plate (5025) has symmetrical tilt angles at its upper and lower parts, and the connection adopts a rounded transition structure.

3. The vacuum circuit breaker according to claim 2, characterized in that, The elastic element (5023) is a compression spring, and its preload direction always coincides with the axis of the rocker arm (501). The inner wall of the sleeve (5021) is provided with a linear slide rail that cooperates with the rocker arm (501).

4. The vacuum circuit breaker according to claim 3, characterized in that, The opening and closing mechanism (3) includes a crank arm (301) movably disposed at the bottom of the housing (1). One end of the crank arm (301) is controlled to swing up and down by the main shaft (2), and the other end is connected to the vacuum interrupter to realize the control of closing and opening.

5. The vacuum circuit breaker according to claim 4, characterized in that, The opening and closing mechanism (3) also includes an opening spring (3031) disposed at one end of the crank arm (301), and the main shaft (2) is provided with an opening lever (3032) for locking the potential energy of the opening spring (3031).

6. The vacuum circuit breaker according to claim 5, characterized in that, The energy storage mechanism (4) includes an energy storage spring (401) and an energy storage crank (402). The energy storage crank (402) adopts an automatic energy storage mode driven by a motor (7) and an emergency energy storage mode driven by a handle (11). The motor (7) is controlled to start and stop by a micro switch (6).

7. The vacuum circuit breaker according to claim 6, characterized in that, The outer casing (1) is equipped with a counter (8) that is linked to the crank arm (301) to record the number of opening and closing operations of the vacuum circuit breaker.

8. The vacuum circuit breaker according to claim 7, characterized in that, The outer casing (1) is provided with an opening and closing indicator (9) and an energy storage indicator (10). The opening and closing indicator (9) is mechanically linked with the main shaft (2) to display the opening and closing status, and the energy storage indicator (10) is linked with the energy storage spring (401) to display the energy storage status.

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