Vacuum circuit breaker

Abstract

The invention discloses a vacuum circuit breaker, and particularly relates to the technical field of circuit breakers, the vacuum circuit breaker comprises a shell, a main shaft, an opening and closing mechanism and an energy storage mechanism, the vacuum circuit breaker further comprises a protection mechanism, 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, motion conversion from main shaft rotation to swing of the swing rod is achieved, and a sliding block wrapped by a sleeve is arranged on the swing rod; an elastic piece is arranged between hinge points of the sliding block and the swing rod, a cylindrical block is fixed outside the sleeve, guide plates which are vertically symmetrical and inclined are arranged in the shell, and the cylindrical block makes contact with the surfaces of the guide plates to form a sliding pair. The protection mechanism arranged in the invention can greatly shorten the arc existence time, the shorter the arc duration time is, the smaller the erosion to the contact is, the service life of the vacuum arc-extinguishing chamber can be effectively prolonged, the negative influence of long-term vibration on internal parts can be reduced, the problems of loosening, abrasion and failure of the parts can be relieved, and the service life of the vacuum arc-extinguishing chamber can be prolonged. And the service life of each key component of the vacuum circuit breaker is further prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and more particularly, to a vacuum circuit breaker. Background Art

[0002] The "vacuum circuit breaker" gets its name from the fact that both its arc-extinguishing medium and the insulating medium in the contact gap after arc extinguishing are high vacuum. Its advantages include small size, light weight, suitability for frequent operation, and the fact that arc extinguishing requires no maintenance, making it widely used in distribution networks. Vacuum circuit breakers are indoor power distribution devices in 3-10kV, 50Hz three-phase AC systems. They are used to protect and control electrical equipment in industrial and mining enterprises, power plants, and substations. They are particularly suitable for applications requiring oil-free operation, minimal maintenance, and frequent operation. Circuit breakers can be deployed in central cabinets, double-layer cabinets, and fixed cabinets to control and protect high-voltage electrical equipment.

[0003] In practice, the drive mechanism of a vacuum circuit breaker achieves rapid contact opening and closing through precise control, effectively shortening arc duration and reducing thermal erosion and electrolytic wear. However, the high force of the drive mechanism presents two major drawbacks: First, violent contact collisions can easily cause surface damage, wear, dents, and even cracks, leading to reduced conductivity and contact reliability, increased resistance, localized overheating, and the risk of electrical failure. Second, mechanical shock is transmitted throughout the entire structure, and long-term vibration can accelerate the loosening, wear, and failure of internal components, ultimately shortening the equipment's service life.

[0004] For example, the Chinese patent application number 202411975492.6 discloses a high-voltage vacuum circuit breaker opening and closing drive mechanism, which belongs to the field of circuit breaker technology and includes a box body and a vacuum chamber, wherein the vacuum chamber is mounted on the box body and is arranged in multiple groups; a wiring port, wherein the wiring port is fixedly mounted on the side surface of the vacuum chamber, and each group of vacuum chambers is equipped with two groups of wiring ports, and the two groups of wiring ports are arranged in an upper and lower manner; a conductive plate, wherein the conductive plate is mounted inside the wiring port, and one end of the conductive plate extends into the vacuum chamber; and a first conductive column, wherein the upper end of the first conductive column is fixedly connected to the conductive plate of the upper end group. The present invention can achieve an initial fast speed when closing or opening the switch, and a slow speed in the later stage. When performing the opening and closing operation, the initial fast speed and the rapid dynamic change can effectively reduce the generation of arcs, and the slow speed in the later stage can avoid the problem that the excessive opening and closing speed causes excessive impact on the overall structure of the circuit breaker.

[0005] Although a buffer structure has been added to the application document, which can reduce the impact caused by the driving mechanism to a certain extent, it cannot further reduce the speed at which the static contacts and the moving contacts in the vacuum interrupter separate or disconnect. If the arc exists for too long, it is easy to cause damage to the static contacts and the moving contacts.

[0006] Therefore, the present invention proposes a vacuum circuit breaker to solve the above problems. Summary of the Invention

[0007] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a vacuum circuit breaker, which solves the problems raised in the above-mentioned background technology by providing a protection mechanism.

[0008] To achieve the above-mentioned object, 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: The protection mechanism includes a swing rod hinged to the bottom of the housing, the other end of the swing rod being connected to the main shaft to realize the motion conversion from the rotation of the main shaft to the swing of the swing rod; The rocker arm is provided with a sleeve, a slider penetrating the rocker arm is provided in the sleeve, an elastic member is provided between the slider and the hinge point of the rocker arm, a cylindrical block is fixed on the outside of the sleeve, and a guide plate symmetrically inclined up and down is provided in the outer shell, and the cylindrical block contacts the surface of the guide plate to form a sliding pair.

[0009] Preferably, the upper and lower parts of the guide plate have symmetrical inclination angles, and the connection adopts an arc transition structure.

[0010] Preferably, the elastic member is a compression spring, the direction of its preload force always coincides 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.

[0011] Preferably, the opening and closing mechanism also includes an opening assembly, and the opening and closing mechanism includes a crank arm movably arranged at the bottom of the shell, one end of the crank arm swings up and down through the main shaft control, and the other end is connected to the vacuum arc chamber to realize the control of closing and opening the switch.

[0012] Preferably, the opening and closing mechanism further comprises an opening spring arranged at one end of the crank arm, and an opening latch for locking the potential energy of the opening spring is provided on the main shaft.

[0013] Preferably, the energy storage mechanism includes an energy storage spring and an energy storage shaft. The energy storage shaft adopts an automatic energy storage mode driven by a motor and an emergency energy storage mode driven manually by a handle. The motor is started and stopped by a micro switch.

[0014] Preferably, a counter linked to the crank arm is provided in the housing for recording the number of opening and closing operations of the vacuum circuit breaker.

[0015] Preferably, an opening and closing indicator plate and an energy storage indicator plate are provided in the housing. The opening and closing indicator plate is mechanically linked with the main shaft to display the opening and closing status, and the energy storage indicator plate is linked with the energy storage spring to display the energy storage status.

[0016] Technical effects and advantages of the present invention: 1. The present invention has two energy storage modes: motor drive and manual drive. The motor can drive the crankshaft to automatically store energy, and the start and stop are controlled by the micro-motion mechanism. A handle is also provided to facilitate manual driving of the energy storage crankshaft by the operator when the control circuit is out of power. The closing and opening operations are output through the control circuit, which respectively controls the closing and opening coils, drives the interlocking mechanism to operate, and accurately controls the operation of the vacuum interrupter, realizing remote and simple operation and ensuring reliable circuit connection and disconnection. In addition, the energy storage function of the energy storage spring enables the vacuum circuit breaker to close quickly, improve the response speed, and enhance the stability of the power system.

[0017] 2. This invention achieves intelligent monitoring of the operating status of the vacuum circuit breaker and improved stability 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 and closing indicator and the energy storage indicator simultaneously display the on / off and energy storage status, allowing operation and maintenance personnel to grasp the operating parameters in real time. The matching opening latch locks the potential energy stored in the opening spring in the closed state, maintaining stable contact between the moving and static contacts. This design significantly improves the operational reliability and maintainability of the equipment through the dual protection of status visualization and mechanical self-locking.

[0018] 3. The present invention adds a protection mechanism, and its core guide plate adopts a vertically symmetrical and inclined structural design. During the opening or closing operation of the vacuum circuit breaker, the elastic part releases the pre-stored elastic potential energy, providing additional driving force for the rotation of the main shaft, accelerating its rotation, and then driving the dynamic and static contacts in the vacuum interrupter to quickly separate, greatly shortening the arc existence time. The shorter the arc duration, the less erosion on the contacts, which can effectively extend the life of the vacuum interrupter. When the elastic part contracts, it generates a reverse force, which can buffer the subsequent rotation of the main shaft and avoid excessive mechanical shock due to excessive inertia. This buffering mechanism can reduce the negative impact of long-term vibration on internal components, alleviate the problems of loosening, wear and failure of components, and further extend the service life of key components of the vacuum circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 The figure is a rear view of the overall structure of the present invention with part of the outer shell removed.

[0021] Figure 3 It is a left side cutaway schematic diagram of the present invention.

[0022] Figure 4 It is a right side schematic view cut along the cam end face of the present invention.

[0023] Figure 5 It is a right side schematic view cut along the end face of the gate opening latch of the present invention.

[0024] Figure 6 It is a right side schematic view cut along the handle end face of the present invention.

[0025] Figure 7 It is a structural diagram of the protection mechanism in the present invention.

[0026] Figure 8 It is a cross-sectional schematic diagram of the protection mechanism in the present invention.

[0027] The accompanying drawings are: 1. Shell; 2. Spindle; 3. Opening and closing mechanism; 301. Crank arm; 302. Closing assembly; 3021. Pressure plate; 3022. Connecting rod; 3023. Cam; 3024. Needle bearing; 3025. First interlocking mechanism; 3026. Closing coil; 303. Opening assembly; 3031. Opening spring; 3032. Opening latch; 3033. Second interlocking mechanism; 3034. Opening coil; 4. Energy storage mechanism; 401. Energy storage spring; 402. Energy storage crank shaft; 5. Protective mechanism; 501. Rocker; 502. Active portion; 5021. Sleeve; 5022. Slider; 5023. Elastic member; 5024. Cylindrical block; 5025. Guide plate; 6. Micro switch; 7. Motor; 8. Counter; 9. Opening and closing indicator; 10. Energy storage indicator; 11. Handle. DETAILED DESCRIPTION

[0028] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] Example 1 See also Figures 1 to 8 As shown, the vacuum circuit breaker in the embodiment of the present invention includes a housing 1 and a main shaft 2. The main shaft 2 is rotatably arranged in the housing 1, and also includes: an opening and closing mechanism 3 and an energy storage mechanism 4.

[0030] See also Figure 1 and Figure 2 As shown, the opening and closing mechanism 3 includes a crank arm 301 movably arranged 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 the switch; Figure 3As shown, the energy storage mechanism 4 includes an energy storage spring 401 and an energy storage crank 402. One end of the energy storage spring 401 is connected to the top of the housing 1, and the other end is connected to the end of the energy storage crank 402. The energy storage spring 401 is used to store energy and achieve rapid closing.

[0031] Specifically, a moving contact and a static contact are provided in the vacuum interrupter, and 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 static contact to separate or contact, thereby realizing the control of closing and opening the circuit breaker.

[0032] See also Figure 3 and Figure 4 As shown, the opening and closing mechanism 3 also includes a closing assembly 302, which includes a pressure plate 3021 arranged on the main shaft 2, and the end of the pressure plate 3021 away from the main shaft 2 is hinged with a connecting rod 3022, and the free end of the connecting rod 3022 is hinged to the end of the crank arm 301 close to the main shaft 2.

[0033] See also Figure 2 and Figure 4 As shown, the closing assembly 302 also includes a cam 3023 arranged on the energy storage crank shaft 402, and a needle bearing 3024 is provided on the other end of the pressure plate 3021 away from the main shaft 2, which is in contact with the outer surface of the cam 3023. A first interlocking mechanism 3025 hinged to the cam 3023 is provided in the housing 1, and a closing coil 3026 for driving the first interlocking mechanism 3025 to operate is provided in the housing 1.

[0034] Specifically, the closing coil 3026 starts to work after receiving the closing signal, and the output end 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.

[0035] See also Figure 2 and Figure 5 As shown, the opening and closing mechanism 3 also includes a gate opening component 303, and the gate opening component 303 includes an opening spring 3031. One end of the opening spring 3031 is connected to the end of the crank arm 301 close to the main shaft 2, and the other end is connected to the bottom of the shell 1. An opening latch 3032 is provided on the main shaft 2, and the opening latch 3032 is used to lock the opening spring 3031. A second interlocking mechanism 3033 is provided in the shell 1 for driving the opening latch 3032 to swing, and an opening coil 3034 is provided in the shell 1 for driving the second interlocking mechanism 3033 to operate.

[0036] Specifically, the opening coil 3034 starts working after receiving the opening signal, and the output end of the opening coil 3034 drives the second interlocking mechanism 3033 to operate. The second interlocking mechanism 3033 drives the opening latch 3032 to swing, releasing the limit on the main shaft 2, and then releasing the lock on the opening spring 3031.

[0037] See also Figure 1 and Figure 6 As shown, a micro switch 6 and a motor 7 are provided in the housing 1 , and 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 , and the motor 7 is controlled to start and stop by the micro switch 6 .

[0038] It should be noted that the micro switch 6 and the motor 7 are both 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 structures will not be described in detail here.

[0039] See also Figure 1 As shown, a counter 8 linked to the crank arm 301 is provided in the housing 1 for recording the number of opening and closing operations of the vacuum circuit breaker. Each time the crank arm 301 is closed and opened, the counter 8 counts once.

[0040] See also Figure 1 and Figure 3 As shown, an opening and closing indicator 9 and an energy storage indicator 10 are provided in the housing 1. 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.

[0041] 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.

[0042] When in use, it is necessary to connect the free end of the crank arm 301 to the moving contact of the vacuum interrupter, and then connect the vacuum circuit breaker to the control circuit in the electrical cabinet. In the initial state, the energy storage spring 401 is set to be in an extended state. At this time, the vacuum circuit breaker is in an energy storage and open state. The opening and closing indicator 9 shows that the circuit is open, and the energy storage indicator 10 shows that energy has been stored.

[0043] 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 operation of the first interlocking mechanism 3025, causing the first interlocking mechanism 3025 to release the limit on the cam 3023. At this time, the cam 3023 and the energy storage crank shaft 402 can rotate freely. The tension generated by the stretched energy storage spring 401 drives the energy storage crank shaft 402 to rotate. The energy storage crank shaft 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, and the pressure plate 3021 drives the main shaft 2 to rotate.

[0044] At the same time, 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 close to the main shaft 2 to swing downward, and the crank arm 301 begins to squeeze the opening spring 3031 downward, and the end of the crank arm 301 away from the main shaft 2 begins to swing upward, and 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 static contact, the vacuum circuit breaker is in the closed state, the circuit is connected, the opening and closing indicator sign 9 switches to the closed display, and the energy storage indicator sign 10 switches to the non-energy storage display, the opening latch 3032 swings and clamps the main shaft 2, so that the static contact and the moving contact in the vacuum interrupter remain in contact, and the opening spring 3031 is in a compressed state.

[0045] When the vacuum circuit breaker needs to open, 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 latch 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 end of the crank arm 301 close to the main shaft 2 to swing upward, and the end of the crank arm 301 away from the main shaft 2 begins to swing downward, driving the moving contact in the vacuum interrupter chamber to move downward, and the moving contact and the static contact are separated. Since both the moving contact and the static contact are in the vacuum environment in the vacuum interrupter chamber, the generation of the arc can be suppressed during the separation process. The vacuum circuit breaker is in the open state, the opening and closing indicator 9 switches to the open display, and the counter 8 counts once, so that the staff can understand the number of times the vacuum circuit breaker has been used. When the counter 8 shows a certain number of times, the staff can maintain the vacuum circuit breaker.

[0046] After the vacuum circuit breaker is in the open state, the control circuit outputs an electrical signal, which acts on the microswitch 6. The button of the microswitch 6 is pressed, and the motor 7 starts working. The output end of the motor 7 drives the energy storage crank shaft 402 to rotate. The energy storage crank 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 stored display, which facilitates the rapid closing of the vacuum circuit breaker next time.

[0047] When the control circuit lacks power, the staff can also use the handle 11 to drive the energy storage shaft 402 to rotate, thereby manually storing energy. A one-way bearing can be set at the rotating connection point between the handle 11 and the shell 1, so that the staff can pull the handle 11 back and forth to drive the energy storage shaft 402 to rotate unidirectionally in the direction of stretching the energy storage spring 401, which is convenient for the staff to use.

[0048] Example 2 In actual use, it was found that when the vacuum circuit breaker is closed and opened, the energy storage spring 401 and the opening spring 3031 drive the various components to operate with great force, and there is a lack of a buffer structure. These components collide with other components in the vacuum circuit breaker with great force and are easily damaged, thereby reducing the service life of the vacuum circuit breaker. Although some circuit breakers in the prior art have added a buffer structure, they cannot reduce the speed at which the static contacts and the moving contacts in the vacuum interrupter are separated or disconnected. The arc exists for too long, which can easily cause damage to the static contacts and the moving contacts. Further improvements are made on the basis of the above embodiment.

[0049] See also Figure 2 and Figure 6 and Figure 7 As shown, the protection mechanism 5 includes a rocker arm 501, one end of which is hinged to the bottom of the housing 1, and the other end is connected to the main shaft 2. A movable portion 502 is provided on the rocker arm 501. When the vacuum circuit breaker is closed or opened, the movable portion 502 can first accelerate and then reduce the speed of the main shaft 2.

[0050] See also Figure 7 and Figure 8 As shown, the movable part 502 includes a sleeve 5021 sleeved on the rocker 501, a slider 5022 penetrating the rocker 501 is provided in the sleeve 5021, an elastic member 5023 is provided between the end of the rocker 501 hinged to the housing 1 and the slider 5022, a cylindrical block 5024 is provided on the outside of the sleeve 5021, and a guide plate 5025 is provided in the housing 1, the upper and lower parts of the guide plate 5025 are inclined and symmetrical to each other, and the cylindrical block 5024 and the guide plate 5025 are in surface contact to form a sliding pair.

[0051] Please refer to Figure 8 As shown, the elastic member 5023 is a compression spring, the direction of its preload force always coincides with the axis of the rocker 501 , and the inner wall of the sleeve 5021 is provided with a linear slide rail that cooperates with the rocker 501 .

[0052] See also Figure 7 As shown, the upper and lower parts of the guide plate 5025 have symmetrical inclination angles, and the connection adopts an arc transition structure.

[0053] On the basis of the above embodiment, during use, in the initial state, the cylindrical block 5024 is in contact with the lower part of the guide plate 5025, and the angle between the rocker arm 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, and when the main shaft 2 rotates, it will pull the rocker arm 501 to swing upward. The elastic member 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 rocker arm 501.

[0054] The cylindrical block 5024 slides upward along the inclined surface of the lower part of the guide plate 5025, and the cylindrical block 5024 gradually becomes farther away from the hinge point of the rocker arm 501 and the housing 1. The sleeve 5021 and the slider 5022 slide along the length direction of the rocker arm 501. The elastic member 5023 tends to drive the rocker arm 501 to swing upward, and the elastic member 5023 gradually stretches. At this time, the elastic force of the elastic member 5023 drives the rocker arm 501 to swing upward, which can accelerate the speed at which the rocker arm 501 swings upward. The force of the elastic member 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, and can accelerate the rotation speed of the main shaft 2, thereby accelerating the contact speed of the moving contact and the static contact in the vacuum interrupter, reducing the time duration of the arc generation, and reducing the arc consumption rate of the moving and static contact materials, thereby extending the service life of the vacuum interrupter.

[0055] 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 toward the direction close to the hinge point between the rocker arm 501 and the shell 1. The elastic member 5023 has a tendency to drive the rocker arm 501 to swing downward, and the elastic member 5023 gradually shortens. At this time, the elastic force of the elastic member 5023 acts as 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 a role in buffering mechanical impact.

[0056] When the vacuum circuit breaker is opened, 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 of the guide plate 5025 to the lower part, which also achieves the effect of first accelerating and then reducing the rotation speed of the main shaft 2. Accelerating the rotation speed of the main shaft 2 can speed up the separation speed of the static contact and the moving contact in the vacuum interrupter, thereby reducing the duration of the arc generation and the speed at which the arc consumes the material of the static and moving contacts. Reducing the rotation speed of the main shaft 2 can buffer mechanical impacts, which is beneficial to extending the service life of various components in the vacuum circuit breaker.

[0057] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by 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: A protection mechanism (5) comprising a swing rod (501) hinged to the bottom of the housing (1), wherein the other end of the swing rod (501) is connected to the main shaft (2) to achieve motion conversion from rotation of the main shaft (2) to swing of the swing rod (501); The rocking rod (501) is provided with a sleeve (5021), a slider (5022) penetrating the rocking rod (501) is provided in the sleeve (5021), an elastic member (5023) is provided between the slider (5022) and the hinge point of the rocking rod (501), a cylindrical block (5024) is fixed on the outside of the sleeve (5021), and a guide plate (5025) symmetrically inclined in the upper and lower directions is provided in the housing (1), and the cylindrical block (5024) and the guide plate (5025) are in contact with each other on the surface to form a sliding pair.

2. The vacuum circuit breaker according to claim 1, characterized in that The upper and lower parts of the guide plate (5025) have symmetrical inclination angles, and the connection adopts an arc transition structure.

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

4. The vacuum circuit breaker according to claim 3, characterized in that The opening and closing mechanism (3) comprises a crank arm (301) movably arranged 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 achieve closing and opening control.

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

6. The vacuum circuit breaker according to claim 5, characterized in that The energy storage mechanism (4) comprises an energy storage spring (401) and an energy storage crank shaft (402). The energy storage crank shaft (402) adopts an automatic energy storage mode driven by a motor (7) and an emergency energy storage mode manually 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 A counter (8) linked to the crank arm (301) is provided in the housing (1) and is used 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 An opening and closing indicator (9) and an energy storage indicator (10) are provided in the housing (1); 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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