Operating mechanism for circuit breaker, circuit breaker and ring main unit

Abstract

The application relates to the technical field of power distribution equipment, in particular to a trip mechanism for a circuit breaker, a circuit breaker and a ring main unit, the trip mechanism comprising a base plate, wherein an input shaft, an output shaft, a circuit breaker switch, a closing holding part, a driving cam and a transmission connecting rod part are arranged on the base plate; in the transmission connecting rod part, one end of a first lever arm is in transmission connection with the output shaft, the other end is in rotary connection with a second lever arm through a first rotary shaft, one end of a third lever arm is in rotary connection with the base plate, the other end is in rotary connection with the second lever arm through a second rotary shaft; the first rotary shaft and the driving cam form a cam mechanism; in the application, the peripheral wall of the driving cam has the dual functions of pushing and limiting, cooperates with the closing holding part, exerts certain constraints on the movement track of the transmission connecting rod part, omits an external independent lock buckle component, simplifies the transmission level, eliminates gap accumulation and action dispersion caused by the series connection of multiple movement pairs, and can quickly and efficiently perform closing, opening and other actions with a simple structure.

Description

Technical Field

[0001] This invention relates to the field of power transmission and distribution equipment technology, specifically to an operating mechanism for a circuit breaker, a circuit breaker, and a ring main unit. Background Technology

[0002] As a critical control and protection device in power transmission and distribution systems, the performance of circuit breakers directly affects the safe and stable operation of the entire power system. Spring-operated mechanisms, with their advantages of fast operation, small size, and no need for external high-power power supplies, have become the mainstream drive method for circuit breakers in medium-voltage ring main units.

[0003] With the increasing demands for compact equipment layout in power systems, and the rapid development of gas-insulated ring main units (GIS) towards miniaturization, high reliability, and maintenance-free operation, the market has placed higher technical requirements on circuit breaker operating mechanisms. Specifically, the new generation of operating mechanisms not only needs to have reliable opening and closing control capabilities, but also needs to adapt to the industry development trends of integrated design, standardized production, and miniaturized installation, in order to achieve the goals of reducing the overall equipment footprint, lowering operation and maintenance costs, and enhancing environmental adaptability.

[0004] However, looking at the commonly used circuit breaker spring operating mechanisms in the industry, most adopt a split structure with multi-stage linkages, half-shaft locking, and independent trip units. The various functional modules (such as energy storage units, closing units, opening units, and output units) are spatially scattered, lacking effective functional integration design. This directly results in a large overall volume of the operating mechanism, which not only restricts the miniaturization of the ring main unit but also increases the wiring complexity of the secondary control circuit. Furthermore, existing operating mechanisms contain a large number of independent transmission parts and connecting fasteners. The lengthy power transmission chain relies on the series coordination of multiple kinematic pairs, leading to a gradual accumulation of clearance tolerances between machining and on-site assembly. This not only makes it difficult to guarantee product consistency during mass production and difficult to debug and maintain later, but also increases the probability of failure for individual units due to the large number of parts, reducing the long-term stability and reliability of overall operation.

[0005] In summary, developing a compact operating mechanism, circuit breaker, and compatible ring main unit with few parts, high transmission efficiency, and smooth operation has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes an operating mechanism, circuit breaker, and ring main unit with a simple structure capable of simultaneously controlling the closing, holding, and opening actions of a circuit breaker:

[0007] The specific technical solution for the operating mechanism is as follows:

[0008] An operating mechanism for a circuit breaker includes a base plate. An input shaft, an output shaft, a circuit breaker switch, and a closing holding portion are disposed on the base plate. The output shaft is driven by the circuit breaker switch. The mechanism further includes: a drive cam driven by the input shaft; and a transmission linkage portion disposed on the base plate, including a first arm, a second arm, and a third arm. One end of the first arm is driven by the output shaft, and the other end of the first arm is rotatably connected to the second arm via a first rotating shaft. One end of the third arm is rotatably connected to the base plate, and the other end of the third arm is rotatably connected to the second arm via a second rotating shaft. The included angle between the first arm and the second arm is α, where α < 180°; the included angle between the third arm and the second arm is β, where β < 180°. °; The included angles α and β are located on both sides of the second lever arm, the driving cam and the included angle β are located on the same side of the transmission linkage, the third lever arm is connected to a spring unit, the spring unit provides the third lever arm with the torque to rotate toward the included angle β side, and the first rotating shaft always remains against the driving cam under the action of the spring unit, the first rotating shaft and the driving cam form a cam mechanism; the closing holding part is movably engaged with the second rotating shaft, the closing holding part and the cam mechanism together restrict the movement of the transmission linkage to realize the closing holding of the circuit breaker switch; the closing holding part gives way to the second rotating shaft, allowing the circuit breaker switch to close; the cam mechanism drives the transmission linkage to control the output shaft to realize the closing of the circuit breaker switch.

[0009] In this scheme, a multi-stage series layout consisting of the first, second, and third lever arms, combined with the rolling contact between the first rotating shaft and the peripheral wall of the drive cam, establishes a definite motion constraint relationship. This effectively limits the adverse effects of the gradual accumulation of backlash on the final output accuracy, improves assembly consistency during mass production, and reduces debugging time and costs. Unlike existing devices, the entire operating mechanism uses the drive cam not only as an active pusher but also, in conjunction with the transmission link connected to the output shaft, as a constraint when the circuit is closed. The peripheral wall of the drive cam has both pushing and limiting functions, applying a definite constraint to the motion trajectory of the transmission link. This eliminates the need for an external independent locking assembly, simplifies the transmission hierarchy, and eliminates the backlash accumulation and motion dispersion caused by the series connection of multiple kinematic pairs. The structure is simple yet can quickly and efficiently perform multiple functions such as closing and opening the circuit.

[0010] Preferably, a transmission crank arm is coaxially provided on the output shaft, and a switch linkage that cooperates with the circuit breaker switch is rotatably connected to the end of the transmission crank arm. When the output shaft rotates, it drives the switch linkage to swing, thereby controlling the operation of the circuit breaker switch.

[0011] In existing mechanisms, the closing energy storage operation and transmission action are usually completed by independent components. After energy storage is completed, an additional positioning and holding device is required, resulting in an increase in the number of components and structural complexity. Therefore, a closing energy storage component is also provided on the input shaft. The closing energy storage component includes a closing pull member rotatably connected to the eccentric position or side of the drive cam. A closing spring is fixedly connected to the closing pull member, and the other end of the closing spring is rotatably connected to the base plate. When the input shaft is driven to rotate, the closing pull member can stretch the closing spring to perform closing energy storage. By coaxially fixing a closing crank arm on the input shaft, the stretching and energy storage process of the closing spring is completed synchronously with the rotation drive process of the input shaft, realizing the integrated linkage of energy storage operation and transmission drive, eliminating the independent energy storage operation link and the corresponding intermediate conversion component, and simplifying the operation process.

[0012] Preferably, the closing energy storage component further includes a closing lever and a limiting post that abuts against the closing lever. One end of the closing lever is rotatably mounted on the base plate via a closing lever shaft, and the limiting post is disposed on the surface of the drive cam. The closing lever has a working position and a clearance position. When the closing lever is in the working position, it is located on the movement path of the limiting post, allowing the limiting post to abut against the closing lever, thereby maintaining the energy storage of the closing spring. A spring force unit is provided on the closing lever, which provides a torque for the closing lever to rotate in the direction of its working position. In this design, the abutment and limiting of the closing lever against the limiting post on the drive cam surface creates motion constraints on the degrees of freedom of the drive cam, ensuring that the energy storage state of the closing spring can be stably maintained under both static and vibration conditions.

[0013] Preferably, the drive cam includes a semi-circular arc portion concentric with the input shaft and an eccentric transition concave arc portion. The drive cam is configured such that when the drive cam rotates to the point where the limit post is abutted by the closing lever in the working position, the first rotating shaft is engaged in the transition concave arc portion; when the closing lever is in the clearance position, the closing spring drives the drive cam to rotate, and the drive cam causes the included angle α of the transmission linkage to increase, causing the first lever arm to drive the output shaft to rotate, thereby achieving closing. Through a customized drive cam, the kinematic pair formed by the cam mechanism formed by the drive cam can precisely drive or restrict the rotation of the input shaft during its operation.

[0014] Preferably, the closing spring has a maximum pulling distance on the closing lever. When the limiting post is blocked by the closing lever, the closing lever rotates past the maximum position. In this scheme, by designing the extension stroke of the closing spring to exceed the maximum position (i.e., the dead point), the pulling direction of the closing spring on the closing crank arm is reversed eccentrically, generating a continuous driving torque on the input shaft along the original rotation direction. This forces the limiting post to always press against the surface of the closing lever, changing the spring force from resistance to driving force. No external force needs to be provided afterward; the continuous energy storage action of closing can be maintained solely by the spring force.

[0015] Preferably, the output shaft is further provided with a tripping energy storage component. The tripping energy storage component includes a tripping crank arm coaxially connected to the output shaft. A tripping pull member is rotatably connected to the end of the tripping crank arm. One end of a tripping spring is fixedly connected to the tripping pull member, and the other end of the tripping spring is rotatably connected to the base plate. The output shaft rotates by driving a first lever arm via a drive cam. This rotation of the output shaft causes the tripping pull member to stretch the tripping spring, allowing the spring to store energy. In this design, the transmission crank arm and the tripping crank arm are coaxially fixed to the output shaft, ensuring that the closing action and the energy storage of the tripping spring are completed synchronously through the rotation of the same output shaft. A single closing operation simultaneously achieves the dual functions of load driving and energy storage, improving the efficiency of mechanical energy utilization, reducing the number of independent energy storage and transmission components, and making the mechanism layout more compact.

[0016] Preferably, the closing holding part includes a closing lever, one end of which is rotatably mounted on the base plate. The closing lever has a working position and a clearance position. The closing lever is provided with the elastic unit, which provides a torque for the closing lever to rotate toward the working position. When the closing lever is in the working position, it is located on the movement trajectory of the second rotating shaft and can block the third lever arm from rotating away from the included angle β.

[0017] Traditional anti-pumping schemes mostly rely on external electrical protection devices or control boxes, lacking direct mechanical linkage with the operating mechanism itself, resulting in response delays and requiring regular maintenance and verification of the electrical circuits. When the closing command persists after tripping due to contact sticking or button jamming, the circuit breaker will enter an infinite "trip-close-trip" cycle, seriously threatening equipment and system safety. Therefore, preferably, it also includes an anti-pumping unit, which includes an anti-pumping limit plate, an anti-pumping protrusion, and a closing push plate. One end of the anti-pumping limit plate is rotatably mounted on the base plate. The anti-pumping limit plate is provided with an abutment block and an anti-pumping torsion spring, which causes the anti-pumping limit plate to rotate in the direction of engaging the limit slot. The anti-pumping protrusion is protruding from the transmission crank arm. The closing push plate is coaxially fixed and rotates synchronously with the closing lever. The side of the closing push plate facing the anti-pumping limit plate is provided with a limit slot adapted to the limit plate. In this scheme, the anti-jump limit plate engages with the limit latch in the closed state to lock the closing lever in the working position. In the open state, the anti-jump protrusion disengages from the limit latch through the abutment of the abutment block, thereby releasing the lock on the closing lever. That is, a purely mechanical linkage system integrating the anti-jump limit plate, anti-jump protrusion, and closing push plate is integrated within the operating mechanism. This achieves automatic locking of the closing lever after the opening action is executed, ensuring that the closing lever is forcibly locked in the working position and cannot rotate to the avoidance position when the closing command is continuously present. This fundamentally blocks the possibility of secondary closing from a physical perspective, completely eliminating the path of "jumping" faults. This anti-jump scheme does not rely on any external electrical components or control logic, responds instantaneously with mechanical linkage, has no delay, and requires no regular maintenance.

[0018] A cabinet includes a circuit breaker and an operating mechanism for any of the circuit breakers mentioned above.

[0019] A ring network cabinet includes the aforementioned circuit breaker. Installing the circuit breaker in the cabinet can effectively reduce the cabinet size. The entire circuit breaker is easy to install and also facilitates cabinet opening and maintenance.

[0020] The beneficial effects of this invention are:

[0021] The present invention achieves full mechanical linkage of closing, holding and opening by the compact cooperation between the drive cam and the stage transmission linkage, together with the closing holding part. This greatly reduces the number of parts and the size of the mechanism, meets the needs of circuit breakers to develop towards integration and miniaturization. The structure is simple and can also perform multiple functions such as closing and opening quickly and efficiently. Attached Figure Description

[0022] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0024] Figure 2 This is a front view of the present invention;

[0025] Figure 3 This is a rear view of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the present invention in the open state;

[0027] Figure 5 This is a schematic diagram of the structure of the present invention in the closed-hold state;

[0028] Figure 6 This is a schematic diagram of the structure of the present invention in the closed state;

[0029] Figure 7 This is a schematic diagram of the anti-jump unit of the present invention.

[0030] In the above figures, the corresponding reference numerals are as follows:

[0031] 100-Baseboard, 200-Transmission Linkage, 210-First Lever, 220-Second Lever, 230-Third Lever, 231-First Rotating Shaft, 232-Second Rotating Shaft, 300-Input Shaft, 310-Drive Cam, 311-Semi-circular Arc, 312-Transition Concave Arc, 313-Fine Arc End, 314-Wide Arc End, 315-Limiting Post, 316-Active Motor, 320-Large Gear, 330-Closing Crank Arm, 331-Closing Pull Component, 332-Closing Spring, 400-Input Shaft Output shaft, 410-transmission crank arm, 411-switch shaft, 412-connecting shaft, 413-anti-pumping protrusion, 420-opening crank arm, 421-opening pull piece, 422-opening spring, 500-switch linkage, 600-opening lever, 610-opening lever shaft, 700-closing lever, 710-closing lever shaft, 800-anti-pumping limit vertical plate, 810-anti-pumping shaft, 820-circuit breaker switch, 830-abutment block, 900-closing push plate, 910-limit bayonet. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings and through specific implementation methods of the embodiments of the present invention.

[0033] Example 1:

[0034] like Figures 1 to 6 As shown, the present invention provides an operating mechanism for a circuit breaker, comprising a base plate 100. A transmission linkage portion 200 is provided on the base plate 100. An input shaft 300 and an output shaft 400 are rotatably disposed on the base plate 100, both extending in a direction perpendicular to the base plate 100. A transmission crank arm 410 and a tripping crank arm 420 are coaxially fixedly disposed on the output shaft 400. When the output shaft 400 rotates around its own axis, it drives the transmission crank arm 410 and the tripping crank arm 420 to rotate in the same direction. A drive cam 310 and a large gear 320 are coaxially fixedly connected to the input shaft 300. The large gear 320 is transmissionally connected to a drive motor 316. The drive motor drives the large gear 320 to rotate, thereby driving the drive cam 310 to rotate around the input shaft 300. It should be noted that the drive cam 310, the large gear 320, and the input shaft 300 are coaxially fixedly connected by a flat key or spline to ensure the reliability of power transmission.

[0035] The transmission linkage 200 is composed of a plurality of linkage arms that are rotatably connected in sequence. The linkage arm at the head end is rotatably connected to the transmission crank arm 410, and the linkage arm at the tail end is rotatably connected to the base plate 100.

[0036] Please see Figure 4 The drive cam 310 includes a semi-circular arc portion 311 concentric with the input shaft 300 and an eccentric transition concave arc portion 312. The transition concave arc portion 312 connects to both ends of the semi-circular arc portion 311, forming a thin arc end 313 and a wide arc end 314. The thin arc end 313 can be inserted into the transmission connecting rod portion 200, allowing the pivot of one set of connecting rod arms to be secured in the transition concave arc portion 312. Specifically, the semi-circular arc portion 311 of the drive cam 310 has a contour of a semi-circular arc concentric with the input shaft 300; the transition concave arc portion 312 is an inwardly concave arc segment; the thin arc end 313 is a transition end with a smaller radius of curvature at the connection between the transition concave arc portion 312 and the semi-circular arc portion 311; and the wide arc end 314 is a transition end with a larger radius of curvature at the connection between the transition concave arc portion 312 and the semi-circular arc portion 311. The connection between the transition concave arc portion 312 and the semi-circular arc portion 311 adopts a smooth arc transition to ensure that the first rotating shaft 231 can slide smoothly during the process of moving from the transition concave arc portion 312 to the semi-circular arc portion 311, and avoid jamming or impact.

[0037] Please continue reading. Figure 3The transmission crank arm 410 is circumferentially spaced around the output shaft 400, with a switch shaft 411 and a connecting shaft 412. A switch linkage 500 is rotatably connected to the switch shaft 411, and the switch linkage 500 is drively connected to the circuit breaker switch 820. A tripping pull member 421 is rotatably connected to the tripping crank arm 420, and a tripping spring 422 is connected to the tripping pull member 421. The other end of the tripping spring 422 is fixedly connected to the base plate 100. When the transmission crank arm 410 is subjected to force and rotates, it drives the tripping crank arm 420 to rotate synchronously. The transmission crank arm 410 drives the switch linkage 500 to rotate, thereby controlling the closing and opening of the circuit breaker. The tripping crank arm 420 drives the tripping pull member 421 to lengthen the tripping spring 422, allowing the tripping spring 422 to accumulate kinetic energy and achieve tripping force storage.

[0038] Specifically, such as Figures 4 to 6 The transmission linkage 200 is a multi-link structure, including a first link arm 210, a second link arm 220, and a third link arm 230. One end of the first link arm 210 is connected to the output shaft, and the other end of the first link arm 210 is rotatably connected to the second link arm 220 via a first rotating shaft 231. One end of the third link arm 230 is rotatably connected to the base plate, and the other end of the third link arm is rotatably connected to the second link arm via a second rotating shaft 232. The included angle between the first link arm 210 and the second link arm 220 is α. <180°; the included angle formed by the third lever arm 230 and the second lever arm 220 is β, β < 180°; the included angles α and β are located on both sides of the second lever arm 220, and the driving cam is located on the same side of the transmission link with the included angle β. The third lever arm is connected to a spring unit, which provides the third lever arm 230 with a torque to rotate toward the included angle β side. Under the action of the spring unit, the first rotating shaft 231 always remains in contact with the driving cam, and the first rotating shaft 231 and the driving cam form a cam mechanism. In this embodiment, a first bearing can be sleeved on the first rotating shaft 231, and a second bearing can be sleeved on the second rotating shaft 232. The first bearing is used to abut against the peripheral wall of the driving cam 310. In this embodiment, the first bearing is a roller bearing, which can reduce the frictional resistance between the bearing and the peripheral wall of the driving cam 310 and improve the transmission efficiency.

[0039] A closing crank arm 330 is also concentrically connected to the drive cam 310 on the input shaft 300, and the closing crank arm 330 rotates synchronously with the drive cam 310. A closing pull member 331 is rotatably mounted on the closing crank arm 330, and a closing spring 332 is fixedly connected to the closing pull member 331. The other end of the closing spring 332 is fixedly connected to the base plate 100. The large gear 320 is driven by a motor, which drives the input shaft 300 to rotate, thereby causing the closing crank arm 330 to rotate around the input shaft 300, causing the closing pull member 331 to stretch the closing spring 332, allowing the closing spring 332 to perform closing energy storage. In some embodiments, the closing crank arm 330 can be omitted, and the closing pull member 331 can be directly rotatably mounted on the drive cam 310.

[0040] During the closing energy storage process, the drive cam 310 also rotates. At this time, the thin arc end 313 of the drive cam 310 can be inserted into the transmission link 200. The pivot of one set of link arms is fastened in the transition concave arc part 312, which can restrict the rotation of the drive cam 310 in the direction of the pivot of the link arm. At this time, it is only necessary to restrict the rotation on the other side of the drive cam 310 to allow the closing spring 332 to store energy.

[0041] A trip lever 600 is provided on one side of the transmission linkage 200, and the input shaft 300 is provided on the other side of the transmission linkage 200. One end of the trip lever 600 is fixedly and rotatably mounted on the base plate 100 via a trip lever shaft 610. The trip lever 600 can reach two extreme positions by rotation, namely the working position and the clearance position. When in the working position, the tip of the trip lever 600 is located on the rotation trajectory of the end of the third lever arm 230 where the second shaft 232 is located, which can block the rotation of the third lever arm 230 toward the trip lever 600. A trip lever torsion spring is provided at the trip lever shaft 610, and the trip lever 600 always has a tendency to rotate toward the working position under the elastic force of the trip lever torsion spring, that is, the trip lever 600 can always be in the working position under the elastic force of the torsion spring. A force greater than that of the torsion spring of the trip lever is required to rotate the trip lever 600 from the working position to the avoidance position. And like a pawl, a limit structure is provided to lock the extreme position of the trip lever in the working position, preventing it from rotating further away from the avoidance position.

[0042] A third lever torsion spring is provided at the pivot of the third lever 230, so that the third lever 230 is subjected to a force that rotates it away from the trip lever 600.

[0043] The present invention also includes a closing actuator 700 for storing and maintaining the closing spring 332. One end of the closing actuator 700 is fixedly and rotatably mounted on the base plate 100 via a closing actuator shaft 710. In this embodiment, the closing actuator shaft 710 is rotatably sleeved on the output shaft 400, and the closing actuator 700 and the output shaft 400 are clearance-fitted to achieve independent rotation. The two extreme positions reached by the closing actuator 700 through rotation are the working position and the clearance position. When in the working position, the non-rotating end of the closing actuator 700 is on the movement trajectory of the limiting post 315 fixedly provided on the surface of the drive cam 310, and can prevent the drive cam 310 from rotating to one side by abutting against the drive cam 310. A closing actuator torsion spring is also provided at the closing actuator shaft 710, and the closing actuator 700 always has a tendency to rotate towards the working position under the elastic force of the closing actuator torsion spring.

[0044] Based on the above structure, the operating principle of this invention is as follows:

[0045] (a) Initial state

[0046] In the initial state, such as Figure 4 As shown, neither the opening spring 422 nor the closing spring 332 is under stress or energy storage. At this time, the switch linkage 500 driven by the transmission crank arm 410 keeps the circuit breaker in the open state. At this time, the frontal projection of the opening lever 600 coincides with the frontal projection of the second lever arm 220. The third lever arm 230 is always subjected to a counterclockwise rotational force under the action of the third lever arm torsion spring. The force on the second lever arm 220 causes the first rotating shaft 231 to always abut against the outer wall of the semi-circular arc portion 311 of the drive cam 310.

[0047] (ii) Closing the energy storage operation

[0048] To perform a closing operation, a closing energy storage operation is first required. The active motor controls the large gear 320 to rotate counterclockwise, which in turn causes the input shaft 300 to drive the drive cam 310 and the closing crank arm 330 to rotate counterclockwise. During the counterclockwise rotation of the closing crank arm 330, the closing spring 332 is continuously stretched, allowing it to store energy. After the closing crank arm 330 rotates to its maximum stretching distance, it needs to continue rotating so that the reaction force of the closing spring 332 on the closing crank arm 330 shifts from a clockwise direction to a counterclockwise direction. That is, the motor needs to control the drive cam 310 to rotate more than 180°, so that the closing spring 332 is at its over-dead position. Figure 5 As shown.

[0049] During the counterclockwise rotation of the drive cam 310, the limiting post 315 on the surface of the drive cam 310 rotates accordingly until the limiting post 315 abuts against the tip of the closing latch 700. At this time, the first rotating shaft 231 just passes the semi-circular arc portion 311 and is positioned at the transition concave arc portion 312. The third lever arm 230 rotates counterclockwise under the force of the third lever arm torsion spring, and the second lever arm 220 is actuated by the force of the third lever arm 230, causing the first rotating shaft 231 to fall into the transition concave arc portion 312, forming a configuration where the thin arc end 313 of the drive cam 310 is inserted into the transmission connecting rod portion 200, and the first rotating shaft 231 is fastened in the transition concave arc portion 312.

[0050] Furthermore, when the third lever 230 rotates counterclockwise, the end with the second rotating shaft 232 applies force to the trip lever 600, causing the trip lever 600 to rotate to the clearance position. After the third lever 230 passes, the trip lever 600 returns to the working position under the action of the trip lever torsion spring on its rotating shaft. At this time, the limiting post 315 of the drive cam 310 is limited by the closing lever 700 in the clockwise direction. The tension of the closing spring 332 is eccentric, generating a counterclockwise force on the drive cam 310. Even if the motor stops working and the large gear 320 is not subjected to external force, the limiting post 315 on the drive cam 310 can still abut against the closing lever 700 under the tension of the closing spring 332, allowing the entire closing spring 332 to complete its power storage action and automatically lock.

[0051] (III) Closing Operation

[0052] When a closing operation is required, the closing actuator 700 can be rotated to the avoidance position by manual (pressing the button to deflect the closing actuator) or electric (electric telescopic rod to push the closing actuator to rotate) control. The drive cam 310 will instantly lose its contact restriction, and the closing spring 332 will release its elasticity, causing the drive cam 310 to rotate counterclockwise.

[0053] During the counterclockwise rotation of the drive cam 310, the first shaft 231 on the second lever arm 220 moves around the outer wall of the drive cam 310. Under the action of the wide arc end 314 of the drive cam 310, the first shaft 231 moves further and further away from the input shaft 300; as the drive cam 310 continues to rotate, the first shaft 231 moves back to the semicircular arc portion 311. Since the outline of the semicircular arc portion 311 is a semicircle concentric with the input shaft 300, the distance between the first shaft 231 and the input shaft 300 remains constant, allowing the first shaft 231 to be abutted and restricted on the semicircular arc portion 311. Furthermore, since the second shaft 232 on the second lever arm 220 is abutted by the trip lever 600 in the direction of force movement, the force on the second lever arm 220 is transmitted to the first lever arm 210, and the first lever arm 210 drives the transmission crank arm 410 to rotate counterclockwise around the output shaft 400. The transmission crank arm 410 drives the switch linkage 500 to pull the circuit breaker switch, thereby closing the circuit breaker.

[0054] Simultaneously, the rotation of the transmission crank arm 410 drives the rotation of the tripping crank arm 420. The tripping crank arm 420 drives the tripping pull member 421 to stretch the tripping spring 422, causing the tripping spring 422 to accumulate kinetic energy and achieve tripping force storage. At this time, if the tripping spring 422 wants to release its elastic force, the tripping crank arm 420 can only rotate clockwise along the direction of the elastic force. The clockwise rotation tendency of the synchronously rotating transmission crank arm 410 is transmitted to the first lever arm 210, which then transmits the force to the second lever arm 220. The end of the second lever arm 220 located on the second rotating shaft 232 is limited by the tripping latch 600, and the end located on the first rotating shaft 231 is abutted and limited by the semi-circular portion 311 of the drive cam 310, preventing rotation. This ensures that the tripping spring 422 always maintains its stored energy, achieving the holding action of closing the circuit. Figure 6 As shown.

[0055] (iv) Circuit breaker tripping operation

[0056] When a tripping operation is required, the tripping lever 600 is manually (by pressing a button to deflect it) or electrically (by using an electric telescopic rod to rotate it) controlled to rotate to the clearance position. At this time, the rotation restriction of the second rotating shaft 232 is released. The tripping spring 422 releases its elastic force, pulling the transmission crank arm 410 to rotate clockwise, which in turn drives the switch linkage 500 to pull the circuit breaker switch, realizing the tripping of the circuit breaker. The entire operating mechanism eventually returns to the initial tripping state.

[0057] Example 2:

[0058] The difference between this embodiment and Embodiment 1 is that the circuit breaker operating mechanism in this embodiment is also equipped with an anti-pumping unit. When the circuit breaker performs a closing operation, if the closing control command persists (e.g., the closing button is mechanically stuck, the control circuit contacts are stuck, or the relay protection device errs in outputting a closing signal), and a short-circuit fault occurs in the line, after the relay protection device triggers the circuit breaker to open, the closing circuit remains in a conducting state, and the circuit breaker will immediately close again, resulting in continuous closing. This phenomenon causes the vacuum interrupter contacts to be subjected to multiple short-circuit current impacts, leading to accelerated contact erosion, decreased insulation performance of the interrupter, and in severe cases, interrupter breakdown, cabinet arc short circuit, or even equipment explosion and power grid over-tripping accidents. Existing anti-pumping units are usually implemented through external protection devices or operating boxes, which cannot be linked to the operating mechanism and require regular maintenance.

[0059] In this embodiment, an anti-jump unit is provided, such as... Figure 7 As shown, an anti-jump limit vertical plate 800 is provided on one side of the closing actuator 700. One end of the anti-jump limit vertical plate 800 is rotatably connected to the base plate 100 via an anti-jump pivot 810. An anti-jump torsion spring is provided on the anti-jump limit vertical plate 800 at the anti-jump pivot 810 on the base plate 100, and the anti-jump torsion spring causes the anti-jump limit vertical plate 800 to rotate toward the closing actuator 700. An anti-jump protrusion 413 is also provided on the transmission crank arm 410. An abutment block 830 is provided on the anti-jump limit vertical plate 800, which abuts against the anti-jump protrusion 413 when the circuit is opened, restricting the rotation of the anti-jump limit vertical plate 800 under the action of the anti-jump torsion spring.

[0060] A closing push plate 900 is concentrically arranged and rotates synchronously with the closing actuator 700. In this embodiment, the closing push plate 900 is fixedly sleeved on the closing actuator shaft 710 and rotates synchronously with the closing actuator 700. A limiting slot 910 is provided on the side of the closing push plate 900 facing the anti-jump limit vertical plate 800. During opening, the closing push plate 900 and the anti-jump limit vertical plate 800 do not interfere with each other.

[0061] Based on the above structure, the anti-jump principle of this invention is as follows:

[0062] (a) Action of the anti-jump limit plate during the closing process

[0063] When performing the closing operation, the closing lever 700 needs to be rotated to the avoidance position first. The closing spring 332 releases its elastic force, driving the cam 310 to rotate counterclockwise, and the closing action begins.

[0064] During the closing operation, the transmission crank arm 410 rotates counterclockwise, and the anti-jump protrusion 413 on the transmission crank arm 410 moves away from the abutment block 830 of the anti-jump limiting vertical plate 800 as the transmission crank arm 410 rotates counterclockwise. At this time, the anti-jump limiting vertical plate 800 loses the limiting effect of the abutment block 830, and rotates under the action of the anti-jump torsion spring, entering the waiting position.

[0065] After the closing action is completed, the closing lever 700 automatically returns to the working position under the action of the closing lever torsion spring. At this time, the anti-jump limit plate 800 engages with the limit slot 910 of the closing push plate 900, locking the closing lever 700 in the working position.

[0066] (ii) Locking state of the closing lever

[0067] After the anti-jump limit plate 800 engages with the limit slot 910, the closing push plate 900 cannot rotate, thereby locking the closing lever 700, which rotates concentrically and synchronously with the closing push plate 900, into the working position. At this time, even if a closing control command is present, the closing lever 700 cannot rotate to the avoidance position, and cannot subsequently perform a closing action before the opening action.

[0068] (iii) Unlocking of the anti-pumping limit plate during the tripping operation

[0069] When a tripping action is required, the tripping lever 600 is rotated to the clearance position, the tripping spring 422 releases its elastic force, and pulls the transmission crank arm 410 to rotate clockwise, thus the circuit breaker performs the tripping action.

[0070] During the tripping operation, the transmission crank arm 410 returns to its clockwise position. The anti-jump protrusion 413 on the transmission crank arm 410, as it rotates clockwise, re-engages with the abutment block 830 of the anti-jump limiting vertical plate 800. Driven by the anti-jump protrusion 413, the anti-jump limiting vertical plate 800 overcomes the elastic force of the anti-jump torsion spring and rotates away from the limiting slot 910 of the closing push plate 900. The closing latch 700 then unlocks and returns to an operable state.

[0071] Thus, the mechanical anti-jump unit of the present invention completes a complete working cycle. From the completion of the closing action to the completion of the opening action, the closing latch 700 is always locked in the working position by the anti-jump limit plate 800, and cannot perform a second closing operation, thereby effectively preventing the "jumping" phenomenon caused by the continuous existence of the closing command.

[0072] Example 3:

[0073] A circuit breaker includes the operating mechanism described in any of the above embodiments. The operating mechanism is installed within the circuit breaker's mechanism housing, and its power output terminal is connected to the moving contact within the arc-extinguishing chamber for driving the moving contact to contact or separate from the stationary contact, thereby realizing the closing and opening of the circuit breaker. This circuit breaker is preferably used in medium-voltage power distribution systems, but this application is not limited thereto.

[0074] Example 4:

[0075] A ring main unit includes the circuit breaker described in Embodiment 3. The circuit breaker is housed within the ring main unit, with its incoming and outgoing terminals connected to the busbar and corresponding outgoing circuits of the ring main unit, respectively. The operating mechanism of the circuit breaker is used to drive the circuit breaker to open and close, thereby controlling the connection and disconnection of the corresponding circuits, and enabling protective tripping in case of a fault. This ring main unit can be a gas-insulated, air-insulated, or solid-insulated ring main unit, but this application is not limited to these types.

[0076] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention.

Claims

1. An operating mechanism for a circuit breaker, comprising a base plate, wherein an input shaft, an output shaft, a circuit breaker switch, and a closing holding part are disposed on the base plate, the output shaft being drively connected to the circuit breaker switch, characterized in that, Also includes: The drive cam is connected to the input shaft. A transmission linkage, disposed on the base plate, includes a first arm, a second arm, and a third arm. One end of the first arm is drively connected to the output shaft, and the other end of the first arm is rotatably connected to the second arm via a first rotating shaft. One end of the third arm is rotatably connected to the base plate, and the other end of the third arm is rotatably connected to the second arm via a second rotating shaft. The included angle between the first arm and the second arm is α, where α < 180°; the included angle between the third arm and the second arm is β, where β < 180°. The included angles α and β are located on both sides of the second lever arm, the driving cam and the included angle β are located on the same side of the transmission link, the third lever arm is connected to a spring unit, the spring unit provides the third lever arm with the torque to rotate toward the included angle β side, and the first rotating shaft always remains against the driving cam under the action of the spring unit, the first rotating shaft and the driving cam form a cam mechanism; The closing holding part is movably engaged with the second rotating shaft. The closing holding part and the cam mechanism together restrict the movement of the transmission linkage part to realize the closing holding of the circuit breaker switch. The closing holding part makes way for the second rotating shaft to allow the circuit breaker switch to close. The cam mechanism drives the transmission linkage part to control the movement of the output shaft to realize the closing of the circuit breaker switch.

2. The operating mechanism for a circuit breaker according to claim 1, characterized in that, A transmission crank arm is coaxially mounted on the output shaft. A switch linkage that cooperates with the circuit breaker switch is rotatably connected to the end of the transmission crank arm. When the output shaft rotates, it drives the switch linkage to swing, thereby controlling the operation of the circuit breaker switch.

3. The operating mechanism for a circuit breaker according to claim 2, characterized in that, The input shaft is also provided with a closing energy storage component, which includes a closing pull member rotatably connected to the eccentric position or side of the drive cam. A closing spring is fixedly connected to the closing pull member, and the other end of the closing spring is rotatably connected to the base plate. When the input shaft is driven to rotate, the closing pull member can stretch the closing spring to perform closing energy storage.

4. The operating mechanism for a circuit breaker according to claim 3, characterized in that, The closing energy storage component further includes a closing lever and a limiting post that abuts against the closing lever. One end of the closing lever is rotatably mounted on the base plate via a closing lever shaft, and the limiting post is disposed on the surface of the drive cam. The closing lever has a working position and a clearance position. When the closing lever is in the working position, it is located on the movement path of the limiting post, allowing the limiting post to abut against the closing lever, thereby achieving the energy storage and retention of the closing spring. The closing lever is provided with a spring force unit, which provides the closing lever with a torque to rotate in the direction of the closing lever's working position.

5. The operating mechanism for a circuit breaker according to claim 4, characterized in that, The drive cam includes a semi-circular arc portion concentric with the input shaft and an eccentric transition concave arc portion. The drive cam is configured such that when the drive cam rotates to the point where the limiting post is abutted by the closing lever in the working position, the first rotating shaft is engaged in the transition concave arc portion. When the closing lever is in the clearance position, the closing spring drives the drive cam to rotate, and the drive cam causes the included angle α of the transmission linkage to expand, causing the first lever arm to drive the output shaft to rotate, thereby achieving closing. The closing spring has a maximum pulling distance on the closing pull member. When the limiting post is blocked by the closing lever, the closing pull member rotates past the maximum position.

6. The operating mechanism for a circuit breaker according to claim 2, characterized in that, The output shaft is also provided with a tripping energy storage component, which includes a tripping crank arm coaxially connected to the output shaft. A tripping pull member is rotatably connected to the end of the tripping crank arm. One end of the tripping spring is fixedly connected to the tripping pull member, and the other end of the tripping spring is rotatably connected to the base plate. The output shaft drives the first lever arm to rotate by driving the cam. The rotation of the output shaft can cause the tripping pull member to stretch the tripping spring, so that the tripping spring stores energy.

7. The operating mechanism for a circuit breaker according to claim 6, characterized in that, The closing holding part includes a closing lever, one end of which is rotatably mounted on the base plate. The closing lever has a working position and a clearance position. The closing lever is provided with the elastic unit, which provides a torque for the closing lever to rotate toward the working position. When the closing lever is in the working position, it is located on the movement trajectory of the second rotating shaft and can block the rotation of the third lever arm toward the direction away from the included angle β.

8. The operating mechanism for a circuit breaker according to claim 5, characterized in that, It also includes an anti-jump unit, which includes an anti-jump limit plate, an anti-jump protrusion, and a closing push plate. One end of the anti-jump limit plate is rotatably mounted on the base plate. The anti-jump limit plate is provided with an abutment block and an anti-jump torsion spring. The anti-jump torsion spring causes the anti-jump limit plate to rotate in the direction of engaging the limit slot. The anti-jump protrusion is protruding from the transmission crank arm. The closing push plate is coaxially fixed and rotates synchronously with the closing lever. The closing push plate has a limit slot adapted to the limit plate on the side facing the anti-jump limit plate.

9. A circuit breaker, characterized in that, Includes an operating mechanism for a circuit breaker as described in any one of claims 1 to 8.

10. A ring network cabinet, characterized in that, Includes a circuit breaker as described in claim 9.

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