An external motor side-mounted vacuum circuit breaker

Abstract

This invention discloses an externally mounted vacuum circuit breaker with a side-mounted motor, comprising a vacuum interrupter and an operating box, and a motor assembly mounted outside the operating box. Inside the operating box is an upper drive shaft meshing with an intermediate gear. The right end of the upper drive shaft extends to the right. The motor assembly is detachably connected to the right side wall of the operating box, and the output shaft of the motor assembly is detachably connected to the right end of the upper drive shaft. The motor assembly includes a brake servo motor and a reversing gearbox. The reversing gearbox contains a forward gear and a reverse gear coaxially mounted on the output shaft. The forward gear is sleeved on the output shaft via a forward one-way bearing, and the reverse gear is sleeved on the output shaft via a reverse one-way bearing. Both the forward and reverse gears can slide along the output shaft. This invention modularizes the energy storage motor and reduction gear and places them externally, while also adding an energy storage spindle positioning function to reduce maintenance difficulty.

Description

Technical Field

[0001] This invention belongs to the field of vacuum circuit breaker technology, specifically relating to an external motor side-mounted vacuum circuit breaker. Background Technology

[0002] Side-mounted vacuum circuit breakers typically employ an integrated design of the operating mechanism and the circuit breaker body, resulting in a compact structure. They are commonly used in power plants, industrial and mining enterprises, power distribution, and substations in power systems for the control and protection of power transformation, transmission, and motor voltage transformation. Using vacuum as the arc-extinguishing and insulating medium, when the moving and stationary contacts are energized and opened under the action of the operating mechanism, a vacuum arc is generated between the contacts. Simultaneously, the longitudinal magnetic field generated by the special structure of the contacts ensures that the arc remains diffuse and evenly distributed across the contact surface, maintaining a low arc voltage. When the current naturally crosses zero, the remaining ions, electrons, and metal vapor recombine or accumulate on the contact surface and shield within microseconds, rapidly restoring the dielectric insulation strength of the arc-extinguishing chamber, thereby extinguishing the arc and achieving disconnection.

[0003] The aforementioned operating mechanism includes components such as a tripping knob, a closing knob, a stop, an energy storage indicator, manual energy storage, electric energy storage, and a tripping / closing indicator. When the energy storage motor 35 is functioning correctly, electric energy storage is generally used, with manual energy storage as a backup. Electric energy storage involves the energy storage motor 35 driving the energy storage main shaft 4 through a two-stage reduction gear set. One end of the rotating main shaft has an energy storage crank arm 5. During the swinging motion of the crank arm 5, the energy storage spring 6 is stretched or compressed. The spring is gradually stretched or compressed, converting mechanical energy into elastic potential energy. Simultaneously, the stop locks the spring position to prevent energy release. Manual energy storage involves a handle driving the energy storage main shaft 4. To prevent manual and electric energy storage from interacting, and to prevent the energy storage main shaft 4 from driving the energy storage motor 35 and the handle during the opening and closing process, a one-way bearing is installed between the handle and the energy storage main shaft 4. Only the handle can drive the energy storage main shaft 4, while the energy storage main shaft 4 cannot drive the handle. Similarly, the two-stage reduction gear set of the energy storage motor 35 also has a one-way bearing for the same purpose.

[0004] Compared to conventional vacuum circuit breakers, existing side-mounted vacuum circuit breakers are indeed significantly smaller in size and have a particularly compact internal structure, but they also have some shortcomings:

[0005] 1. Due to its compact internal structure, the components are arranged in layers along the front-to-back direction for optimal organization. For example, the front side cover houses a button layer containing status indicator lights, on / off switches, and other components. Further back is the transmission layer, housing reduction gears, energy storage springs, energy storage spindles, and other components. Following that is the electrical layer, housing the energy storage motor, relays, and other electronic components. If the energy storage motor malfunctions, the components preceding it must be disassembled sequentially before the motor can be replaced. Therefore, the disassembly and assembly process is cumbersome and prone to human error.

[0006] 2. The energy storage motor itself is large in size, taking up a lot of internal space in the circuit breaker, which is not conducive to the arrangement of other parts.

[0007] 3. A first-stage reduction gear set 33 and a second-stage reduction gear set 34 are provided between the output shaft 10 of the energy storage motor 35 and the energy storage main shaft 4. The reduction gear set not only occupies internal space, but also does not form a modular structure with the energy storage motor 35. The transmission is dispersed and not centralized enough, which is not conducive to the existing modular maintenance and improving maintenance efficiency.

[0008] 4. During maintenance / repair, the energy storage spindle needs to rotate forward or backward a certain number of times. However, both the energy storage motor and the energy storage handle are equipped with one-way bearings, preventing them from driving the spindle in the reverse direction. The spindle must be manually rotated using tools, but this movement causes the energy storage spring to store energy, making manual rotation extremely difficult. Furthermore, a greater challenge lies in maintaining the energy storage spindle in a specific position between the closing and opening positions. The circuit breaker's internal stop mechanism cannot remain locked in this specific position, further complicating maintenance and extending the repair time. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention modularizes the energy storage motor and reduction gear, adds a positioning function for the energy storage spindle, and reduces maintenance difficulty. This invention provides an externally mounted side-mounted vacuum circuit breaker, including a vacuum interrupter and an operating box. The vacuum interrupter is mounted at the rear of the operating box via an insulating base, and is linked to the operating mechanism inside the operating box. The operating mechanism includes an energy storage spindle, an energy storage crank arm, an energy storage spring, and an energy storage handle. The energy storage spindle is rotatably connected inside the operating box, the energy storage crank arm is mounted on the left end of the energy storage spindle, and the two ends of the energy storage spring are respectively connected to the energy storage crank arm and the operating box. The energy storage handle is unidirectionally connected to the intermediate gear of the energy storage spindle via a lower drive shaft. The invention also includes a motor assembly mounted outside the operating box, and an upper drive shaft meshing with the intermediate gear inside the operating box. The right side of the upper drive shaft... Extending to the right, the motor assembly is detachably connected to the right side wall of the control box, and the output shaft of the motor assembly is detachably connected to the right end of the upper drive shaft; the motor assembly includes a brake servo motor and a reversing gearbox, the reversing gearbox having a forward gear and a reverse gear coaxially mounted on the output shaft, the forward gear being sleeved on the output shaft via a forward one-way bearing and the reverse gear being sleeved on the output shaft via a reverse one-way bearing, and both the forward gear and the reverse gear can slide along the output shaft; the brake servo motor is connected to the drive gear in the reversing gearbox via a reduction mechanism, and by axially moving the forward gear and the reverse gear, the forward gear meshes with the drive gear or the reverse gear meshes with the drive gear.

[0010] The preferred embodiment of the externally mounted vacuum circuit breaker with a side-mounted motor in this invention is as follows: the output shaft has a spline at its end, and the energy storage main shaft has a spline hole at its end that matches the spline. The motor assembly is bolted to the outside of the control box. After installation, the output shaft can be inserted directly into the spline hole. The installation position is unique, and the motor assembly is very easy to disassemble and assemble, making maintenance extremely easy.

[0011] The preferred embodiment of the externally mounted vacuum circuit breaker with a side-mounted motor in this invention is as follows: the reduction mechanism is a planetary gear mechanism, the shaft of the brake servo motor is coaxially fixed with the sun gear of the planetary gear mechanism, the planet carrier of the planetary gear mechanism has an intermediate shaft, and the intermediate shaft is coaxially fixed with the drive gear. Existing energy storage motors use 1-3 stages of reduction gears. To meet this reduction ratio, a planetary gear mechanism is used instead of multi-stage reduction gears to achieve the same reduction ratio, while eliminating the single-stage reduction gear set in the existing vacuum circuit breaker, freeing up more internal space.

[0012] The preferred embodiment of the external motor side-mounted vacuum circuit breaker in this invention is as follows: a portion of the output shaft is a splined shaft; the inner rings of both the forward and reverse one-way bearings are provided with internal splines adapted to the splined shaft; the outer ring of the forward one-way bearing is coaxially fixed to the forward gear, and the outer ring of the reverse one-way bearing is coaxially fixed to the reverse gear. The reverse one-way bearing and the reverse gear are assembled as a single unit, and both move synchronously. Only the inner ring of the reverse one-way bearing and the splined shaft can move axially relative to each other, but the synchronous rotation relationship between the inner ring and the splined shaft is not affected. Similarly, the forward one-way bearing and the forward gear are also assembled as a single unit, with the same transmission relationship. The special transmission relationship between the internal splines and the inner rings allows for switching the rotation direction of the energy storage main shaft as needed, making maintenance more convenient.

[0013] The preferred embodiment of the external motor side-mounted vacuum circuit breaker in this invention is as follows: Both the side of the forward gear and the side of the reverse gear are provided with levers, and the levers are rotatably connected to the corresponding forward and reverse gears; both levers extend out of the reversing gearbox and are fixedly connected. Further, the side of the forward gear and the side of the reverse gear are respectively provided with axially extending sleeves, and the outer surface of each sleeve is provided with an annular groove adapted to the corresponding lever. The reversing gearbox has a positioning bolt parallel to the spline shaft on its exterior, and the two levers are rotatably connected to the positioning bolt. By rotating the positioning bolt, the two levers move in the same direction. Under normal circumstances, the positioning bolt keeps the forward gear and the drive gear engaged through the levers, and the brake servo motor rotates forward to drive the forward gear to rotate, ultimately driving the energy storage spring to store energy. Similar to existing electric energy storage methods, the brake servo motor drives the energy storage spring to store energy, and the transmission relationship between the forward and reverse gears does not affect the electric energy storage. If maintenance is required, the meshing transmission relationship can be switched to the reverse gear meshing with the drive gear using the positioning bolts, which facilitates maintenance.

[0014] The beneficial effects of the external motor side-mounted vacuum circuit breaker in this invention are as follows:

[0015] 1. Compared with existing vacuum circuit breakers, the external motor design frees up more internal space. On the one hand, this facilitates a more rational layout and arrangement of internal components. On the other hand, if the motor needs to be replaced, it is not necessary to disassemble the original components, greatly simplifying the maintenance process and significantly reducing the difficulty of repair.

[0016] 2. Eliminate the existing primary reduction gear set inside the vacuum circuit breaker and transfer the reduction mechanism to the motor assembly. That is, the motor assembly and the reduction mechanism form a modular part. Both reduction gear failures and motor failures are concentrated in this module, which reduces the probability of internal failures of the vacuum circuit breaker. The maintenance of modular parts is more professional, the faults are more targeted, and the maintenance efficiency is higher.

[0017] 3. The drive gear, forward gear, and forward one-way bearing form a complete electric energy storage system. The forward one-way bearing prevents the reverse rotation of the energy storage spindle from being transmitted to the drive gear, making it no different from existing electric energy storage systems. However, the drive gear can be switched to a reverse gear and a reverse one-way bearing, with the brake servo motor driving the energy storage spindle in reverse to the required angle for maintenance. After the brake servo motor is de-energized, the shaft locks and does not rotate, thus maintaining the current maintenance angle of the energy storage spindle unchanged. This replaces the manual rotation of the energy storage spindle during maintenance, thereby reducing the difficulty of maintenance.

[0018] This invention also provides a method for positioning the energy storage spindle of a side-mounted vacuum circuit breaker. Based on the aforementioned external motor side-mounted vacuum circuit breaker, the steps are as follows: First, rotate the positioning bolt to move two levers in the same direction via the thread. The two levers drive the forward gear and the reverse gear to move axially along the spline shaft until the forward gear disengages from the drive gear. Continue rotating the positioning bolt until the reverse gear meshes with the drive gear. Then, the brake servo motor rotates in the reverse direction, and the drive gear drives the reverse gear to rotate synchronously in reverse. The output shaft drives the upper drive shaft to rotate until the energy storage spindle rotates to a specified angle, at which point the brake servo motor stops. The brake servo motor locks the current angle of the energy storage spindle, and the positioning is completed. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the internal structure of a side-mounted vacuum circuit breaker in the background art of this invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the externally mounted motor side-mounted vacuum circuit breaker in this invention. Figure 1 ;

[0022] Figure 3 This is a schematic diagram of the internal structure of the externally mounted motor side-mounted vacuum circuit breaker in this invention. Figure 2 ;

[0023] Figure 4 This is a schematic diagram of the internal structure of the externally mounted motor side-mounted vacuum circuit breaker in this invention. Figure 3 ;

[0024] Figure 5 This is a schematic diagram of the motor assembly in this invention;

[0025] Figure 6 for Figure 5 Schematic diagram of the internal structure of the reversing gearbox;

[0026] Figure 7 This is a schematic diagram of the internal transmission relationship of the reversing gearbox in this invention;

[0027] Figure 8 This is a schematic diagram of the connection between the forward gear and the output shaft in this invention. Figure 1 ;

[0028] Figure 9 This is a schematic diagram of the connection between the forward gear and the output shaft in this invention. Figure 2 .

[0029] Reference numerals: 1. Vacuum interrupter; 2. Control box; 3. Insulating base; 4. Energy storage spindle; 5. Energy storage crank arm; 6. Energy storage spring; 7. Energy storage handle; 8. Intermediate gear; 9. Upper drive shaft; 10. Output shaft; 11. Spline; 12. Spline hole; 13. Brake servo motor; 14. Reversing gearbox; 15. Forward gear; 16. Reverse gear; 17. Forward one-way bearing; 18. Reverse one-way bearing; 19. 20. Splined shaft; 21. Internal spline; 22. Inner ring; 23. Outer ring; 24. Sun gear; 25. Planet gear; 26. Planet carrier; 27. Intermediate shaft; 28. Drive gear; 29. ​​Paddle shifter; 30. Sleeve; 31. Annular groove; 32. Positioning bolt; 33. Notch; 34. First-stage reduction gear set; 35. Second-stage reduction gear set; 36. Energy storage motor; 37. Lower drive shaft; 38. Limiting slot box; 39. Gear ring. Detailed Implementation

[0030] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The technical solution, its implementation process, and principles will be further explained below with reference to the accompanying drawings and specific implementation examples in the embodiments of this application.

[0031] like Figure 2 As shown, this embodiment provides an external motor side-mounted vacuum circuit breaker. Similar to existing side-mounted vacuum circuit breakers, it includes a vacuum interrupter 1 and an operating box 2. The vacuum interrupter 1 is mounted on the rear of the operating box 2 via an insulating base 3, and is linked to the operating mechanism inside the operating box 2. The operating mechanism includes an energy storage main shaft 4, an energy storage crank arm 5, an energy storage spring 6, and an energy storage handle 7. The energy storage main shaft 4 is rotatably connected inside the operating box 2. The energy storage crank arm 5 is mounted on the left end of the energy storage main shaft 4. The two ends of the energy storage spring 6 are respectively connected to the energy storage crank arm 5 and the operating box 2. The energy storage handle 7 is unidirectionally connected to the intermediate gear 8 of the energy storage main shaft 4 via a lower drive shaft 36. Specifically, a one-way bearing is provided between the energy storage handle 7 and the lower drive shaft 36. During the downward swing of the energy storage handle 7, the lower drive shaft 36 can be rotated through the one-way bearing, while the upward swing of the energy storage handle 7 will not cause the lower drive shaft 36 to rotate.

[0032] The differences from existing side-mounted vacuum circuit breakers are as follows:

[0033] like Figure 3 , Figure 4 As shown, the system includes a motor assembly mounted outside the control box 2. Inside the control box 2, an upper drive shaft 9 meshes with an intermediate gear 8. The right end of the upper drive shaft 9 extends to the right. The motor assembly is detachably connected to the right side wall of the control box 2, and the output shaft 10 of the motor assembly is detachably connected to the right end of the upper drive shaft 9. Specifically, the right side wall of the control box 2 has three threaded holes, and the motor assembly has bolts corresponding to each of the three threaded holes. The end of the output shaft 10 has a spline 11, and the end of the energy storage spindle 4 has a spline hole 12 that matches the spline 11. After the motor assembly is bolted to the outside of the control box 2, the spline 11 portion of the output shaft 10 is inserted directly into the spline hole 12. The installation position is unique, making the motor assembly very easy to assemble and disassemble, and extremely easy to maintain.

[0034] like Figures 5 to 9As shown, the motor assembly in this embodiment includes a brake servo motor 13 and a commutator gearbox 14. The brake servo motor 13 is a motor system that integrates an electromagnetic brake device on the basis of a regular servo motor. The electromagnetic brake device consists of brake pads, an electromagnetic coil, a spring, etc., and is installed at the end or rear end of the motor shaft. The working principle is as follows: when the electromagnetic coil is energized, it generates a magnetic field that attracts the brake pads, overcoming the spring force to release the brake, and the motor rotates normally. When the power is off: the electromagnetic coil loses power, the spring resets, and pushes the brake pads to clamp the motor shaft, achieving rapid braking. The commutator gearbox 14 has a forward gear 15 and a reverse gear 16 coaxially mounted on the output shaft 10. The forward gear 15 is sleeved on the output shaft 10 through a forward one-way bearing 17, and the reverse gear 16 is sleeved on the output shaft 10 through a reverse one-way bearing 18. Both the forward gear 15 and the reverse gear 16 can slide along the output shaft 10. Specifically, a portion of the splined shaft 19 of the output shaft 10, the inner ring 21 of the forward one-way bearing 17, and the inner ring 21 of the reverse one-way bearing 18 are all provided with internal splines 20 adapted to the splined shaft 19. The outer ring 22 of the forward one-way bearing 17 is coaxially fixed to the forward gear 15, and the outer ring 22 of the reverse one-way bearing 18 is coaxially fixed to the reverse gear 16. The reverse one-way bearing 18 and the reverse gear 16 are assembled as one unit, and the two move synchronously. Only the inner ring 21 of the reverse one-way bearing 18 and the splined shaft 19 can move axially relative to each other, but the synchronous rotation relationship between the inner ring 21 and the splined shaft 19 is not affected. Similarly, the forward one-way bearing 17 and the forward gear 15 are also assembled as one unit, and the transmission relationship is the same. However, the difference is that the forward one-way bearing 17 only allows the output shaft 10 to transmit forward rotation to the forward gear 15, and reverse transmission cannot drive the forward gear 15 to rotate. The reverse one-way bearing 18 only allows the output shaft 10 to transmit reverse rotation to the reverse gear 16, while forward transmission cannot drive the reverse gear 16 to rotate.

[0035] like Figure 6 , Figure 7As shown, the aforementioned brake servo motor 13 is connected to the drive gear 27 in the reversing gearbox 14 via a reduction mechanism. Axial movement of the forward gear 15 and the reverse gear 16 causes the forward gear 15 to mesh with the drive gear 27, or the reverse gear 16 to mesh with the drive gear 27. Specifically, the reduction mechanism is a planetary gear mechanism. The ring gear 38 of the planetary gear mechanism is fixed inside the reversing gearbox 14. The sun gear 23 and three planet gears 24 rotate, simultaneously driving the planet carrier 25 to rotate. The shaft of the brake servo motor 13 is coaxially fixed to the sun gear 23 of the planetary gear mechanism. The planet carrier 25 of the planetary gear mechanism has an intermediate shaft 26, which is coaxially fixed to the drive gear 27. By using a planetary gear mechanism instead of a multi-stage reduction gear, the same reduction ratio is achieved, while eliminating the first-stage reduction gear group 33 in the existing vacuum circuit breaker, freeing up more internal space. By integrating the motor assembly and the reduction mechanism into a single modular component, both reduction gear and motor faults are concentrated within this module. This reduces the probability of internal faults in the vacuum circuit breaker, making the maintenance of modular components more professional, more targeted in fault diagnosis, and more efficient.

[0036] like Figure 5 , Figure 6As shown, to achieve the reversing of the reverse gear 16 and the forward gear 15, this embodiment provides paddles 28 on the side of both the forward gear 15 and the reverse gear 16, and the paddles 28 are rotatably connected to the corresponding forward gear 15 and reverse gear 16. Specifically, axially extending sleeves 29 are provided on the side of both the forward gear 15 and the reverse gear 16, and the outer surface of each sleeve 29 is provided with an annular groove 30 that matches the corresponding paddle 28. One end of the paddle 28 is an open annular shape, which is engaged in the corresponding annular groove 30, thereby forming a rotatable connection between the paddle 28 and the sleeve 29. This does not affect the normal rotation of the reverse gear 16 and the forward gear 15, but at the same time, it ensures the positioning of the paddle 28 on the reverse gear 16 and the forward gear 15. Both paddles 28 extend out of the reversing gearbox 14 and are fixedly connected. The two paddles 28 move simultaneously, and the distance between them does not change over time, thereby maintaining a constant distance between the reverse gear 16 and the forward gear 15. Additionally, a limiting slot box 37 adapted to the paddle 28 is provided on the inner side of the right side wall of the reversing gearbox 14. Each paddle 28 has a limiting slider adapted to the sliding groove of the limiting slot box 37 in its middle. The sliding groove of the limiting slot box 37 is parallel to the spline shaft 19. The two paddles 28 move along the sliding groove, maintaining a predetermined direction without misalignment. A positioning bolt 31 parallel to the spline shaft 19 is provided on the outside of the reversing gearbox 14. The two paddles 28 are rotatably connected to the positioning bolt 31. By rotating the positioning bolt 31, the two paddles 28 move in the same direction. The positioning bolt 31 is rotatably connected to the outside of the reversing gearbox 14 via two fixing blocks, and the right side wall of the reversing gearbox 14 has a notch 32 corresponding to the paddle 28. Under normal conditions, the positioning bolt 31, through the paddles 28, keeps the forward gear 15 meshing with the drive gear 27. The brake servo motor 13 rotates forward to drive the forward gear 15 to rotate, ultimately driving the energy storage spring 6 to store energy. Similar to existing electric energy storage methods, the brake servo motor 13 drives the energy storage spring 6 to store energy, and the transmission relationship between the forward gear 15 and the reverse gear 16 does not affect the electric energy storage. If maintenance is required, the meshing transmission relationship can be switched to the reverse gear 16 meshing with the drive gear 27 via the positioning bolt 31 for easy maintenance.

[0037] Similar to existing vacuum circuit breakers, the electric energy storage function is the same under normal conditions. Simply use the positioning bolt 31 to keep the forward gear 15 and the drive gear 27 engaged through the lever 28. The brake servo motor 13 drives the sun gear 23 to rotate, and the sun gear 23 drives the drive gear 27 to rotate through the planet gear 24. The forward gear 15 drives the output shaft 10 to rotate, the upper drive shaft 9 drives the intermediate gear 8 to rotate, and finally the energy storage main shaft 4 drives the energy storage crank arm 5 to swing forward, driving the energy storage spring 6 to store energy.

[0038] Unlike existing vacuum circuit breakers, if the energy storage spindle 4 needs to be rotated in reverse to a certain angle during maintenance, the forward one-way bearing 17 of the forward gear 15 cannot reverse the forward gear 15 to correspondingly drive the energy storage spindle 4 in reverse. This situation requires the following steps:

[0039] First, rotate the positioning bolt 31 to move the two levers 28 in the same direction via the thread. The two levers 28 drive the forward gear 15 and the reverse gear 16 to move axially along the spline shaft 19 until the forward gear 15 disengages from the drive gear 27. Continue rotating the positioning bolt 31 until the reverse gear 16 meshes with the drive gear 27. Then, the brake servo motor 13 rotates in the reverse direction, and the drive gear 27 drives the reverse gear 16 to rotate synchronously in reverse. The output shaft 10 drives the upper drive shaft 9 to rotate until the energy storage spindle 4 rotates to the specified angle, at which point the brake servo motor 13 stops. The brake servo motor 13 locks the current angle of the energy storage spindle 4, and the positioning is completed.

[0040] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. An external motor side-mounted vacuum circuit breaker, comprising a vacuum interrupter and an operating box, wherein the vacuum interrupter is mounted on the rear of the operating box via an insulating base, and the vacuum interrupter is linked with an operating mechanism inside the operating box; the operating mechanism comprises an energy storage spindle, an energy storage crank arm, an energy storage spring, and an energy storage handle, wherein the energy storage spindle is rotatably connected to the operating box, the energy storage crank arm is mounted on the left end of the energy storage spindle, the two ends of the energy storage spring are respectively connected to the energy storage crank arm and the operating box, and the energy storage handle is unidirectionally driven by a lower drive shaft and an intermediate gear of the energy storage spindle; characterized in that Includes a motor assembly installed outside the control box, and an upper drive shaft meshing with an intermediate gear inside the control box. The right end of the upper drive shaft extends to the right. The motor assembly is detachably connected to the right side wall of the control box, and the output shaft of the motor assembly is detachably connected to the right end of the upper drive shaft. The motor assembly includes a brake servo motor and a reversing gearbox. The reversing gearbox contains a forward gear and a reverse gear coaxially mounted on the output shaft. The forward gear is sleeved on the output shaft via a forward one-way bearing, and the reverse gear is sleeved on the output shaft via a reverse one-way bearing. Both the forward and reverse gears can slide along the output shaft. The brake servo motor is connected to the drive gear in the reversing gearbox via a reduction mechanism. By axially moving the forward and reverse gears, the forward gear can mesh with the drive gear, or the reverse gear can mesh with the drive gear.

2. The external motor side-mounted vacuum circuit breaker according to claim 1, characterized in that: The output shaft has a spline at its end, and the energy storage spindle has a spline hole at its end that is compatible with the spline.

3. The external motor side-mounted vacuum circuit breaker according to claim 2, characterized in that: The reduction mechanism is a planetary gear mechanism. The rotating shaft of the brake servo motor is coaxially fixed with the sun gear of the planetary gear mechanism. The planet carrier of the planetary gear mechanism has an intermediate shaft, and the intermediate shaft is coaxially fixed with the drive gear.

4. A vacuum circuit breaker of claim 3, wherein: A portion of the output shaft is a splined shaft. The inner rings of the forward one-way bearing and the reverse one-way bearing are both provided with internal splines that are adapted to the splined shaft. The outer ring of the forward one-way bearing is coaxially fixed with the forward gear, and the outer ring of the reverse one-way bearing is coaxially fixed with the reverse gear.

5. An external motor side-mounted vacuum circuit breaker according to claim 4, characterized in that: Both the side of the forward gear and the side of the reverse gear are provided with a pawl, and the pawl is rotatably connected to the corresponding forward gear and reverse gear; both pawls extend out of the reversing gear box and are fixedly connected.

6. The externally mounted vacuum circuit breaker according to claim 5, characterized in that: The sides of the forward gear and the reverse gear are respectively provided with axially extending sleeves, and the outer surface of each sleeve is provided with an annular groove that matches the corresponding paddle.

7. An external motor side-mounted vacuum circuit breaker according to claim 6, characterized in that: The reversing gearbox is provided with a positioning bolt parallel to the spline shaft on its exterior. Two paddles are rotatably connected to the positioning bolt. By rotating the positioning bolt, the two paddles can be moved in the same direction.

8. A method for positioning the energy storage spindle of a side-mounted vacuum circuit breaker, characterized in that: Based on the external motor-side mounted vacuum circuit breaker as described in claim 7, the steps are as follows: S1. Rotate the positioning bolt to move the two levers in the same direction through the thread. The two levers drive the forward gear and the reverse gear to move along the axial direction of the spline shaft until the forward gear separates from the drive gear. Continue to rotate the positioning bolt until the reverse gear meshes with the drive gear. S2. The brake servo motor rotates in the reverse direction, and the drive gear drives the reverse gear to rotate synchronously in reverse. The output shaft drives the upper drive shaft to rotate until the energy storage spindle rotates to the specified angle. Then the brake servo motor stops and locks the current angle of the energy storage spindle through the brake servo motor, and the positioning is completed.

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