Circuit breaker

Abstract

A circuit breaker relates to the technical field of low-voltage electrical appliances and comprises a shell, a handle, an operating mechanism and a contact mechanism, the shell is provided with a first rotating shaft and a second rotating shaft, the operating mechanism is mounted on the first rotating shaft and comprises a mechanism seat, a jump fastener and a lock fastener, the contact mechanism comprises a moving contact and a static contact, the moving contact is mounted on the second rotating shaft, and the static contact is mounted on the second rotating shaft. The handle and the jump fastener are connected through a first connecting rod. The jump fastener and the moving contact are connected through a second connecting rod. During normal switching-on or switching-off operation, the locking fastener is buckled with the tripping fastener, and the handle is driven to drive the mechanism seat to rotate around the first rotating shaft through the first connecting rod, so that the moving contact is driven to be close to or far away from the static contact through the tripping fastener and the second connecting rod; when a fault is tripped, the locking piece and the tripping piece are tripped, and the moving contact is driven to rotate around the second rotating shaft so as to be far away from the static contact. According to the circuit breaker, the operating mechanism and the moving contact are respectively arranged on different rotating shafts, and the motion decoupling of the operating mechanism and the moving contact is realized during fault tripping, so that the moving contact can be quickly broken.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical apparatus, in particular to a circuit breaker. BACKGROUND

[0002] A circuit breaker is a basic electrical apparatus for switching on, switching off and protecting an electrical circuit. A conventional circuit breaker usually sets a moving contact and an operating mechanism (including a mechanism base, a lock piece, a trip piece, etc.) as an integral component, which is installed on the same rotating shaft. In a normal working state, the integral component is driven by a handle and a connecting rod to complete the closing and opening operations; when a line fault occurs, the lock piece and the trip piece are decoupled by a release, and the integral component rotates as a whole under the action of a spring to separate the moving contact and the static contact to achieve circuit protection.

[0003] However, the conventional circuit breaker has the following defects: because the moving contact and the operating mechanism have a large mass and many moving parts, the integral component needs to overcome a large inertia to move when a fault occurs, which limits the breaking speed of the moving contact, making it difficult to further increase the opening distance, and affecting the breaking capacity and reliability of the circuit breaker. In addition, the moving contact and the operating mechanism are arranged on the same rotating shaft, which makes the structure complex, requires high assembly precision, and is prone to malfunction due to wear or jamming after long-term use. Therefore, there is an urgent need to design a new type of circuit breaker that can significantly improve the response speed and reliability of fault breaking while ensuring reliable operation. SUMMARY

[0004] The purpose of the present application is to provide a circuit breaker that decouples the movement of the operating mechanism and the moving contact by setting them on different rotating shafts when a fault occurs, so that the moving contact can overcome the inertia of the traditional integrated structure and break quickly, thereby significantly improving the breaking speed and reliability of the circuit breaker.

[0005] The embodiments of the present application are implemented as follows: In a first aspect, the application provides a circuit breaker, comprising a housing, a handle, an operating mechanism and a contact mechanism arranged in the housing, the housing is provided with a first rotation shaft and a second rotation shaft in parallel and at intervals, the operating mechanism is rotatably installed on the first rotation shaft, the operating mechanism comprises a mechanism seat, a trip member and a lock member, the contact mechanism comprises a movable contact and a static contact, the movable contact is movably installed on the second rotation shaft, the static contact is fixedly installed in the housing, the handle and the trip member are connected through a first connecting rod, and the trip member and the movable contact are connected through a second connecting rod; wherein, during normal closing or opening operation, the lock member is buckled with the trip member, the handle is driven to drive the mechanism seat to rotate around the first rotation shaft through the first connecting rod, so as to drive the movable contact to move close to or away from the static contact through the trip member and the second connecting rod; during fault tripping, the lock member is unbuckled with the trip member, and the movable contact is driven to rotate around the second rotation shaft to move away from the static contact. The circuit breaker separates the operating mechanism and the movable contact on different rotation shafts, and realizes the motion decoupling of the two during fault tripping, so that the movable contact can overcome the inertia restraint of the traditional integrated structure and break quickly, thereby significantly improving the breaking speed and reliability of the circuit breaker.

[0006] As an implementable manner, one end of the movable contact is provided with a movable contact point, and the other end of the movable contact away from the movable contact point is provided with a sliding groove, and the second rotation shaft is arranged in the sliding groove, so that the movable contact is movably installed on the second rotation shaft.

[0007] As an implementable manner, the contact mechanism further comprises a contact spring, a first end of the contact spring abuts against the movable contact, and a second end of the contact spring abuts against the housing, and the contact spring is used to drive the movable contact to move towards a side away from the static contact.

[0008] As an implementable manner, a first end of the second connecting rod is hinged to the trip member, and a second end of the second connecting rod is hinged to the movable contact, and an abutting point of the contact spring and the movable contact is located between a hinged point of the second connecting rod and the movable contact and the second rotation shaft.

[0009] As an implementable manner, the contact mechanism further comprises a bracket and an arc blocking plate arranged on the bracket, the bracket is rotatably installed on the second rotation shaft, the second end of the second connecting rod is arranged in the bracket and the movable contact, the arc blocking plate extends along a movement track of the movable contact, and is used to block an arc generated when the movable contact and the static contact break from moving towards a side close to the second rotation shaft.

[0010] In one possible implementation, the mechanism seat and the locking fastener are rotatably mounted on the first rotating shaft. The first end of the first connecting rod is hinged to the handle, and the second end passes through the jumping fastener and the mechanism seat. When the locking fastener is released from the jumping fastener, the jumping fastener rotates around the first end of the first connecting rod under the drive of the second connecting rod.

[0011] As one possible implementation, it also includes a release element, which is rotatably installed inside the housing. When the release element is driven to rotate, it can drive the locking element to release from the release element.

[0012] In one possible implementation, the locking member is provided with a boss, and the release member abuts against the boss to push the locking member to release from the release member.

[0013] As one possible implementation, it also includes a trip unit, wherein the push rod of the trip unit is linked with the tripping component to drive the tripping component to rotate; the trip unit includes a current coil and a voltage coil, wherein when a short circuit fault occurs, the current coil operates to drive the push rod to push out, and when there is an overload, leakage current, or remote control, the voltage coil operates to drive the push rod to push out.

[0014] As one possible implementation, the operating mechanism further includes a locking spring, which is sleeved on the first rotating shaft. The first end of the locking spring abuts against the locking member, and the second end abuts against the mechanism seat. The locking spring is used to provide a restoring force for the movement of the locking member relative to the mechanism seat.

[0015] The beneficial effects of the embodiments of this application include: The circuit breaker includes a housing, and a handle, operating mechanism, and contact mechanism disposed within the housing. A first rotating shaft and a second rotating shaft are arranged parallel to each other and spaced apart on the housing. The operating mechanism is rotatably mounted on the first rotating shaft and includes a mechanism base, a trip fastener, and a locking fastener. The contact mechanism includes a moving contact and a stationary contact. The moving contact is movably mounted on the second rotating shaft, and the stationary contact is fixedly mounted within the housing. The handle and the trip fastener are connected via a first connecting rod, and the trip fastener and the moving contact are connected via a second connecting rod. During normal closing or opening operations, the locking fastener engages with the trip fastener, and the handle is driven by the first connecting rod to rotate the mechanism base around the first rotating shaft, thereby causing the moving contact to move closer to or away from the stationary contact via the trip fastener and the second connecting rod. During fault tripping, the locking fastener disengages from the trip fastener, and the moving contact is driven to rotate around the second rotating shaft to move away from the stationary contact. This circuit breaker adopts a dual-shaft independent and motion-decoupled design, with the operating mechanism and moving contact respectively disposed on different rotating shafts and designed with a double-link transmission structure. During normal operation, the mechanism base, trip fastener, locking fastener, and moving contact form a linked whole through two connecting rods, achieving reliable action transmission and position holding. In the event of a fault trip, the moving contact and operating mechanism are decoupled through the rapid release of the locking fastener and trip fastener. The moving contact then breaks at high speed only around its own axis under the action of the breaking drive. This design frees the moving contact from the constraints of the overall inertia of the mechanism in traditional integrated structures, significantly reducing the equivalent mass of moving parts and significantly improving the breaking acceleration and final breaking speed. This effectively increases the contact opening distance, enhances the arc extinguishing capability, and overall improves the breaking performance, operational reliability, and mechanical and electrical life of the circuit breaker. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the circuit breaker in the closed state provided in an embodiment of this application; Figure 2 One of the structural schematic diagrams of the operating mechanism and contact mechanism provided in the embodiments of this application in the closed state; Figure 3 A second schematic diagram of the operating mechanism and contact mechanism in the closed state provided in the embodiments of this application; Figure 4 This is a schematic diagram of the circuit breaker in the open state provided in an embodiment of this application; Figure 5 This is a schematic diagram of the operating mechanism and contact mechanism provided in the embodiments of this application in the open state.

[0018] Icons: 100-Circuit breaker; 10-Housing; 11-First shaft; 12-Second shaft; 20-Handle; 31-Mechanism base; 32-Clutch; 33-Locking element; 331-Boss; 34-Locking spring; 41-Moving contact; 411-Moving contact; 412-Sliding groove; 42-Stationary contact; 43-Contact spring; 44-Bracket; 441-Arc baffle; 51-First link; 52-Second link; 60-Trigger; 70-Trigger device; 71-Top rod. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, not all embodiments. Similar reference numerals and letters in the following drawings indicate similar items. Once an item is defined in one drawing, it does not need to be further defined in other drawings.

[0020] The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and should not be construed as limiting this application. The terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to connections within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] Please refer to the reference. Figures 1 to 5This application provides a circuit breaker 100, including a housing 10, and a handle 20, an operating mechanism, and a contact mechanism disposed within the housing 10. A first rotating shaft 11 and a second rotating shaft 12 are parallel and spaced apart on the housing 10. The operating mechanism is rotatably mounted on the first rotating shaft 11 and includes a mechanism base 31, a trip fastener 32, and a locking fastener 33. The contact mechanism includes a moving contact 41 and a stationary contact 42. The moving contact 41 is movably mounted on the second rotating shaft 12, and the stationary contact 42 is fixedly mounted within the housing 10. The handle 20 and the trip fastener... The fastener 32 is connected via the first link 51, and the trip fastener 32 and the moving contact 41 are connected via the second link 52. During normal closing or opening operations, the locking fastener 33 engages with the trip fastener 32, and the handle 20 is driven by the first link 51 to drive the mechanism base 31 to rotate around the first shaft 11, thereby causing the moving contact 41 to move closer to or away from the stationary contact 42 via the trip fastener 32 and the second link 52. During fault tripping, the locking fastener 33 disengages from the trip fastener 32, and the moving contact 41 is driven to rotate around the second shaft 12 to move away from the stationary contact 42. By separating the operating mechanism and the moving contact 41 onto different shafts and decoupling their movements during fault tripping, the circuit breaker 100 allows the moving contact 41 to overcome the inertial constraints of traditional integrated structures and quickly disconnect, thus significantly improving the breaking speed and reliability of the circuit breaker 100.

[0023] It should be noted that the circuit breaker 100 includes a housing 10, a handle 20, an operating mechanism, and a contact mechanism. The housing 10 provides an installation reference and protection for the other components and is the overall support structure of the circuit breaker 100. A first rotating shaft 11 and a second rotating shaft 12 are arranged parallel to each other and spaced apart on the housing 10 to achieve physical separation of the operating mechanism and the contact mechanism, thereby avoiding these components being concentrated on the same rotating shaft. The operating mechanism includes a mechanism base 31 (the mounting base for supporting the trip fastener 32 and the locking fastener 33), the trip fastener 32 (the core component for transmission and release), and the locking fastener 33 (the locking component in the closed state). The operating mechanism is rotatably mounted on the first rotating shaft 11, responsible for power transmission during normal operation and unlocking triggering during fault tripping. During normal operation, the mechanism base 31, the trip fastener 32, and the locking fastener 33 can be synchronously linked around the first rotating shaft 11. The contact mechanism includes a moving contact 41 (movable conductive component) and a stationary contact 42 (fixed conductive component). The moving contact 41 is movably mounted on the second rotating shaft 12. The circuit is connected or disconnected by the contact or separation of the moving contact 41 and the stationary contact 42. At the same time, it can also ensure that the moving contact 41 can rotate around the second rotating shaft 12 when a fault trip occurs. In addition, the circuit breaker 100 also includes two connecting rods for transmission. The handle 20 and the trip fastener 32 are connected by the first connecting rod 51, and the trip fastener 32 and the moving contact 41 are connected by the second connecting rod 52 to form a transmission link of "handle 20-operating mechanism-moving contact 41".

[0024] When the circuit breaker 100 is in normal closing or opening mode (i.e., linkage state), when the circuit breaker 100 is closed, the handle 20 is driven by external force (indirectly driven by manual or remote control signals), which drives the trip fastener 32 to rotate around the first rotating shaft 11 through the first connecting rod 51. The trip fastener 32 transmits power through the second connecting rod 52, driving the moving contact 41 to rotate around the second rotating shaft 12 towards the stationary contact 42 until the moving contact 41 contacts the stationary contact 42. During this process, the locking fastener 33 and the trip fastener 32 are engaged and locked, maintaining the closed state. When the circuit breaker 100 is opened, the handle 20 is operated in the opposite direction, and the locking fastener 33 and the trip fastener 32 remain engaged. The power is transmitted in the reverse direction through the transmission link, driving the moving contact 41 away from the stationary contact 42, thereby disconnecting the circuit.

[0025] When the circuit breaker 100 is in fault tripping mode (i.e., decoupled state), when a fault such as short circuit, overload, or leakage occurs in the line, or when a remote tripping signal is received, the locking member 33 is driven by an external force to disengage from the tripping member 32 (e.g., the tripping device 70 of the circuit breaker 100 drives the tripping member 60 to rotate, thereby pushing the boss 331 of the tripping member 32 to achieve disengagement). After the locking member 33 and the tripping member 32 are disengaged, the operating mechanism and the moving contact 41 achieve "motion decoupling". The moving contact 41 is no longer involved by the operating mechanism. It only rotates at high speed around the second rotating shaft 12 under the driving action of driving the moving contact 41 to break (e.g., the contact spring 43), quickly moving away from the stationary contact 42 to complete the fault disconnection.

[0026] Traditional circuit breakers have the moving contact and operating mechanism as a single unit, which requires overcoming the overall large mass inertia during movement, thus limiting the breaking speed. This application adopts a "dual-axis independent + tripping decoupling" design, so that when a fault trips, the moving contact 41 only needs to move itself and a few related components, which significantly reduces the equivalent mass and significantly improves the breaking acceleration and final breaking speed. Furthermore, when the moving contact 41 moves, the stroke is amplified in two stages through the transmission link, and the contact opening distance is further increased compared to the traditional structure, which effectively improves the arc extinguishing efficiency and thus enhances the breaking capacity of the circuit breaker 100, especially suitable for severe fault scenarios such as short circuits.

[0027] Traditional structures concentrate all components on a single rotating shaft, resulting in dense parts, complex structure, and high assembly precision requirements. Long-term use can lead to jamming due to wear and interference. This application separates the operating mechanism and contact mechanism onto two rotating shafts, reducing the number of parts on a single shaft, simplifying part features, and lowering assembly difficulty. It also reduces frictional interference between moving parts, significantly lowering the risk of operational failure. During normal operation, a stable linkage is formed between the two linkages and the locking structure, ensuring accurate transmission of closing or opening. In case of fault tripping, the locking element 33 and the tripping element 32 quickly decouple, and the movement of the moving contact 41 is unaffected by the inertia of the operating mechanism. The switching between the two modes is clear, avoiding malfunctions or delayed actions.

[0028] As one possible implementation method, such as Figure 2 and Figure 3 As shown, one end of the moving contact 41 is provided with a moving contact point 411, and the other end of the moving contact 41 away from the moving contact point 411 is provided with a sliding groove 412. The second rotating shaft 12 passes through the sliding groove 412 so that the moving contact 41 is movably mounted on the second rotating shaft 12.

[0029] It should be noted that one end of the moving contact 41 is provided with a moving contact 411. The moving contact 411 is the core conductive part that contacts or separates from the stationary contact 42 and directly undertakes the function of circuit switching. The other end of the moving contact 41 away from the moving contact 411 is provided with a sliding groove 412. The sliding groove 412 serves as the mounting and positioning structure of the moving contact 41. When designing the sliding groove 412, it is necessary to adapt to the outer diameter of the second rotating shaft 12 to ensure that the second rotating shaft 12 can slide smoothly in the sliding groove 412 without excessive clearance. At the same time, the extension direction of the sliding groove 412 matches the rotation trajectory of the moving contact 41, that is, the extension direction of the sliding groove 412 extends along the direction of the switching or closing movement. During installation, the second rotating shaft 12 passes through the sliding groove 412, forming a movable connection structure of "second rotating shaft 12-sliding groove 412", so that the moving contact 41 is movably mounted on the second rotating shaft 12, ensuring that the moving contact 41 can rotate around the second rotating shaft 12, realizing the movement of the moving contact 411 and the stationary contact 42. At the same time, within the limiting range of the sliding groove 412, it can make a small linear sliding along the extension direction of the sliding groove 412. The two motion forms cooperate to provide a structural basis for the stroke amplification and breaking of the moving contact 41.

[0030] When the circuit breaker 100 is in normal closing or opening mode (i.e., linkage state), when the circuit breaker 100 is closed, the handle 20 drives the trip fastener 32 through the first connecting rod 51, which in turn drives the second connecting rod 52 to push the moving contact 41. The moving contact 41 rotates around the second rotating shaft 12 as the fulcrum. At the same time, the sliding groove 412 slides slightly along the second rotating shaft 12 towards the moving contact 411 until the first end of the sliding groove 412 abuts against the second rotating shaft 12, ensuring that the moving contact 41 and the stationary contact 42 are precisely engaged and the contact pressure is stable. When the circuit breaker 100 is opened, the reverse power is transmitted, the moving contact 41 rotates in the opposite direction, and the sliding groove 412 slides along the second rotating shaft 12 away from the moving contact 411 until the second end of the sliding groove 412 abuts against the second rotating shaft 12, assisting the moving contact 41 to smoothly return to the initial position.

[0031] When the circuit breaker 100 is in fault trip mode (i.e., decoupled state), when a fault such as short circuit, overload, or leakage occurs in the line, or when a remote trip signal is received, the locking member 33 is driven by an external force to disengage from the tripping member 32 (e.g., the tripping device 70 of the circuit breaker 100 drives the tripping member 60 to rotate, thereby pushing the boss 331 of the tripping member 32 to release). After the locking member 33 and the tripping member 32 are released, the driving action of the moving contact 41 to break (e.g., the contact spring 43) drives the moving contact 41 to rotate at high speed around the second rotating shaft 12. The design of the sliding groove 412 allows the moving contact 41 to slide quickly along the extension direction of the sliding groove 412 in the initial stage of rotation, further reducing the motion resistance and avoiding the limitation of the rotation stroke of the moving contact 41 by the rigid hinge. The extension length of the sliding groove 412 is matched with the transmission ratio of the second connecting rod 52, so that the rotation stroke of the moving contact 41 is amplified in two stages, ultimately significantly increasing the contact opening distance.

[0032] As one possible implementation method, such as Figure 2 , Figure 3 and Figure 5 As shown, the contact mechanism also includes a contact spring 43. The first end of the contact spring 43 abuts against the moving contact 41, and the second end abuts against the housing 10, forming a stable force link of "housing 10-contact spring 43-moving contact 41", ensuring that the elastic force of the contact spring 43 can be accurately transmitted to the moving contact 41. The contact spring 43 is used to drive the moving contact 41 to move toward the side away from the stationary contact 42.

[0033] When the circuit breaker 100 is in normal closing or opening mode (i.e., linkage state), when the circuit breaker 100 is closed, the handle 20 drives the second link 52 through the first link 51 and the jump fastener 32, pushing the moving contact 41 to rotate around the second rotating shaft 12 towards the stationary contact 42. During the rotation of the moving contact 41, the contact spring 43 is compressed and its energy is stored. At this time, the direction of the elastic force of the contact spring 43 is opposite to the direction of the closing driving force, forming a reverse preload force to ensure that the contact pressure between the moving contact 41 and the stationary contact 42 is stable after closing, avoiding poor contact. When the circuit breaker 100 is opened, the handle 20 drives the transmission link in the reverse direction, the locking fastener 33 and the jump fastener 32 remain engaged, the contact spring 43 releases part of the stored energy, and the driving force of the second link 52 assists in pushing the moving contact 41 to rotate in the reverse direction, away from the stationary contact 42, making the opening action smoother and reducing the manual operation effort.

[0034] When the circuit breaker 100 is in fault trip mode (i.e., decoupled state), when a fault such as short circuit, overload, or leakage occurs in the line, or when a remote trip signal is received, the locking member 33 is driven by an external force to disengage from the tripping member 32 (e.g., the tripping device 70 of the circuit breaker 100 drives the tripping member 60 to rotate, thereby pushing the boss 331 of the tripping member 32 to release). After the locking member 33 and the tripping member 32 are released, the operating mechanism and the moving contact 41 are decoupled (the locking member 33 and the mechanism seat 31 are not driven by the movement of the moving contact 41). At this time, the contact spring 43 becomes the only core driving force for the moving contact 41 to break. The contact spring 43 quickly releases all the stored energy, generating an instantaneous elastic force along the breaking direction, driving the moving contact 41 to rotate at high speed around the second rotating shaft 12, while simultaneously completing a small sliding along the sliding groove 412. With the help of the two-stage stroke amplification structure, the moving contact 41 is quickly broken.

[0035] As one possible implementation method, such as Figure 2 , Figure 3 and Figure 5 As shown, the first end of the second link 52 is hinged to the jump fastener 32, and the second end is hinged to the moving contact 41. The contact point between the contact spring 43 and the moving contact 41 is located between the hinge point of the second link 52 and the moving contact 41 and the second rotating shaft 12.

[0036] It should be noted that, for example, the contact spring 43 is sleeved on the second rotating shaft 12, forming a coaxial assembly structure of "second rotating shaft 12 - contact spring 43". The radial displacement of the spring is strictly limited by the second rotating shaft 12 to prevent skewing or offset during operation. The first end of the second connecting rod 52 is hinged to the jump fastener 32, and the second end is hinged to the moving contact 41. The contact point between the contact spring 43 and the moving contact 41 is located between the hinge point of the second connecting rod 52 and the moving contact 41 and the second rotating shaft 12, forming a "power" The reasonable mechanical layout of "drive point (the hinge point between the second link 52 and the moving contact 41) - elastic reset point (the contact point between the contact spring 43 and the moving contact 41) - rotation fulcrum (second rotating shaft 12)" can avoid mutual interference of forces and allow the elastic force to act directly on the vicinity of the rotation fulcrum of the moving contact 41. The torque is better, and the acceleration of the moving contact 41 rotating around the second rotating shaft 12 is significantly improved. With the two-stage stroke amplification, the breaking speed is significantly improved compared with the traditional integrated structure, and the contact opening distance is further increased.

[0037] As one possible implementation method, such as Figure 2 , Figure 3 and Figure 5As shown, the contact mechanism also includes a bracket 44 and an arc-blocking plate 441 disposed on the bracket 44. The bracket 44 is rotatably mounted on the second rotating shaft 12. The second end of the second connecting rod 52 passes through the bracket 44 and the moving contact 41. The arc-blocking plate 441 extends along the movement trajectory of the moving contact 41 and is used to block the electric arc generated when the moving contact 41 and the stationary contact 42 break from moving towards the side closer to the second rotating shaft 12.

[0038] It should be noted that the contact mechanism also includes a bracket 44, which is rotatably mounted on the second rotating shaft 12. It shares the same rotating shaft with the moving contact 41 and the contact spring 43, forming an integrated assembly unit and avoiding the need for additional installation structures. The arc-blocking plate 441 can be integrally formed or fixedly mounted on the bracket 44 to ensure that the arc-blocking plate 441 moves synchronously with the bracket 44. The arc-blocking plate 441 extends along the movement trajectory of the moving contact 41 and covers the area where the electric arc is generated when the moving contact 41 and the stationary contact 42 break apart. It is used to prevent the electric arc generated when the moving contact 41 and the stationary contact 42 break apart from moving towards the side closer to the second rotating shaft 12.

[0039] When the circuit breaker 100 is in normal closing or opening mode (i.e., linkage state), when the circuit breaker 100 is closed, the handle 20 drives the trip fastener 32 through the first link 51, which in turn drives the second link 52 to push the moving contact 41 to rotate around the second rotating shaft 12 towards the stationary contact 42. Since the second link 52 passes through both the bracket 44 and the moving contact 41, the moving contact 41 moves synchronously, causing the bracket 44 to rotate, so that the arc-blocking plate 441 on the bracket 44 moves closer to the stationary contact 42 along with the moving contact 41, and finally stops outside the area where an arc may be generated (i.e., the standby position), without affecting the contact between the moving contact 41 and the stationary contact 42. When the circuit breaker 100 is opened, the transmission link transmits power in the reverse direction, and the moving contact 41 moves away from the stationary contact 42 around the second rotating shaft 12. The bracket 44 rotates synchronously in the reverse direction with the moving contact 41, and the arc-blocking plate 441 returns to its initial position, avoiding collision or interference with other components inside the housing 10.

[0040] When the circuit breaker 100 is in fault trip mode (i.e., decoupled state), when a fault such as short circuit, overload, or leakage occurs in the line, or when a remote trip signal is received, the locking element 33 is driven by external force to disengage from the tripping element 32 (e.g., the trip unit 70 of the circuit breaker 100 drives the tripping element 60 to rotate, thereby pushing the boss 331 of the tripping element 32 to release). After the locking element 33 and the tripping element 32 are released, the contact spring 43 drives the moving contact 41 to rotate at high speed around the second rotating shaft 12, and the moving contact 41 interacts with the stationary contact 42. The rapid disconnection instantly generates an electric arc. As the moving contact 41 disconnects, the bracket 44 rotates synchronously under the influence of the second link 52. The arc-blocking plate 441 precisely covers the arc area along the movement trajectory of the moving contact 41, preventing the arc from moving towards the side closer to the second rotating shaft 12. This avoids the arc burning key components such as the second rotating shaft 12 and the contact spring 43. With the secondary stroke amplification of the moving contact 41, the arc is confined to the space between the arc-blocking plate 441 and the moving contact 41 and the stationary contact 42, accelerating the extinguishing of the arc.

[0041] As one possible implementation method, such as Figure 2 , Figure 3 and Figure 5 As shown, the mechanism base 31 and the locking fastener 33 are rotatably mounted on the first rotating shaft 11. The first end of the first connecting rod 51 is hinged to the handle 20, and the second end passes through the jump fastener 32 and the mechanism base 31. When the locking fastener 33 is released from the jump fastener 32, the jump fastener 32 rotates around the first end of the first connecting rod 51 under the drive of the second connecting rod 52.

[0042] It should be noted that the mechanism base 31 and the locking element 33 are rotatably mounted on the first rotating shaft 11. The mechanism base 31 provides the mounting base and movement limit for the locking element 33 and the tripping element 32. The locking element 33 is responsible for locking with the tripping element 32 in the closed state. Both rotate around the first rotating shaft 11 to ensure the basic transmission stability of the operating mechanism. The first end of the connecting rod is hinged to the handle 20, and the second end passes through the tripping element 32 and the mechanism base 31, forming a transmission structure of "handle 20-first connecting rod 51-tripping element 32 and mechanism base 31". This ensures that the power is transmitted from the handle 20 to the moving contact 41 during normal operation, and the movement of the two is decoupled in case of fault tripping, without affecting the disconnection of the moving contact 41.

[0043] When the circuit breaker 100 is in normal closing or opening mode (i.e., linkage state), when the circuit breaker 100 closes, the handle 20 is driven to rotate around its own fulcrum, which pushes the trip fastener 32 to rotate around the first rotating shaft 11 through the first connecting rod 51. During the rotation of the trip fastener 32, it engages and locks with the locking fastener 33. At the same time, the moving contact 41 is pushed towards the stationary contact 42 through the second connecting rod 52, and finally the circuit breaker is closed. At this time, the first connecting rod 51, the trip fastener 32, and the mechanism base 31 are all in operation. The locking element 33 forms a stable linkage to ensure the reliable maintenance of the closed position. When the circuit breaker 100 is opened, the reverse operation handle 20 is activated, and the first connecting rod 51 pulls the tripping element 32 to rotate in the opposite direction around the first rotating shaft 11. The locking element 33 and the tripping element 32 remain engaged. The tripping element 32 drives the moving contact 41 away from the stationary contact 42 through the second connecting rod 52. At the same time, the mechanism base 31 and the locking element 33 rotate in the opposite direction synchronously with the tripping element 32, realizing the smooth transmission of the opening action.

[0044] When the circuit breaker 100 is in fault trip mode (i.e., decoupled state), when a fault such as short circuit, overload, or leakage occurs in the line, or when a remote trip signal is received, the locking element 33 is driven by an external force to disengage from the tripping element 32 (e.g., the trip unit 70 of the circuit breaker 100 drives the tripping element 60 to rotate, thereby pushing the boss 331 of the tripping element 32 to release). After the locking element 33 and the tripping element 32 are released, the tripping element 32 is no longer constrained by the locking element 33. Driven by the second link 52 (the moving contact 41 is pulled by the contact spring 43, and the second link 52 pulls the jump fastener 32 in the opposite direction), the mechanism seat 31 and the locking fastener 33 remain stationary around the first rotating shaft 11, and are not driven by the movement of the jump fastener 32 and the moving contact 41, thus completely avoiding the influence of the inertia of the operating mechanism on the breaking of the moving contact 41.

[0045] As one possible implementation method, such as Figure 2 and Figure 3 As shown, the circuit breaker 100 also includes a trip unit 70, the push rod 71 of which is linked with the tripping element 60 to drive the tripping element 60 to rotate. In one possible implementation, the circuit breaker 100 further includes the tripping element 60, which is rotatably mounted within the housing 10. When the tripping element 60 is driven to rotate, it can drive the locking element 33 and the tripping element 32 to disengage. Figure 5 , Figure 1 and Figure 4 As shown, in one possible implementation, the locking member 33 is provided with a boss 331, and the release member 60 abuts against the boss 331 to push the locking member 33 and the release member 32 to release.

[0046] It should be noted that the circuit breaker 100 also includes a tripping member 60, which is rotatably installed inside the housing 10. For example, the tripping member 60 has an L-shaped structure. One end of the tripping member 60 is provided with a force-bearing part corresponding to the push rod 71 of the trip unit 70, and the other end is provided with a driving part matching the boss 331 of the tripping member 32. The force-bearing part of the tripping member 60 is directly opposite the push rod 71 of the trip unit 70, and the two are in clearance fit. When the trip unit 70 is activated, the push rod 71 can directly strike the force-bearing part of the tripping member 60, driving it to rotate around its own fulcrum. The driving part of the tripping member 60 and the boss 331 of the tripping member 32 form a contact driving relationship. When the tripping member 60 rotates, the driving part forces the tripping member 32 to disengage from the locking member 33 by moving the boss 331.

[0047] As one possible implementation method, such as Figure 2 and Figure 3 As shown, the trip unit 70 includes a current coil and a voltage coil. When a short circuit fault occurs, the current coil drives the push rod 71 to push out. When there is an overload, leakage current, or remote control, the voltage coil drives the push rod 71 to push out.

[0048] It should be noted that the trip unit 70 includes a current coil and a voltage coil. The current coil is adapted to short-circuit faults, with fewer coil turns and thicker wire diameter, providing instantaneous response capability to large currents. Its trigger threshold matches the short-circuit fault current. The voltage coil is adapted to overload, leakage faults, and remote control scenarios. It has more coil turns and thinner wire diameter, providing high sensitivity to current changes. It can be activated by detecting line current overload, leakage signals, or receiving external remote control commands. The two coils have independent windings but share the same push rod 71 drive mechanism. The extension direction and stroke of the push rod 71 are completely consistent, ensuring the uniformity of the tripping action under the two triggering methods. This eliminates the need for two additional drive components, simplifying the structure.

[0049] As one possible implementation method, such as Figure 5 , Figure 1 and Figure 4 Figure 2 Figure 3 Figure 5 As shown, the operating mechanism also includes a locking spring 34, which is sleeved on the first rotating shaft 11. The first end of the locking spring 34 abuts against the locking member 33 and the second end abuts against the mechanism seat 31. The locking spring 34 is used to provide a restoring force for the movement of the locking member 33 relative to the mechanism seat 31.

[0050] It should be noted that the operating mechanism also includes a locking spring 34, which is sleeved on the first rotating shaft 11 and shares the same rotating shaft with the mechanism seat 31 and the locking element 33, forming an integrated assembly structure and avoiding the need for additional installation structures. The first end of the locking spring 34 abuts against the locking element 33 and the second end abuts against the mechanism seat 31. When the circuit is closed, the driving force of the tripping element 32 and the preload of the locking spring 34 are balanced to ensure that the tripping element 32 and the locking element 33 are stably engaged. In case of fault tripping, the driving force of the tripping element 60 breaks through this balance and releases the circuit. After release, the preload of the locking spring 34 is converted into the restoring force of the locking element 33, driving the locking element 33 back to its initial position.

[0051] The above description is merely an optional embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0052] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

Claims

1. A circuit breaker, characterized in that, The device includes a housing (10), a handle (20), an operating mechanism, and a contact mechanism disposed within the housing (10). A first rotating shaft (11) and a second rotating shaft (12) are arranged parallel to each other and spaced apart on the housing (10). The operating mechanism is rotatably mounted on the first rotating shaft (11). The operating mechanism includes a mechanism seat (31), a jump fastener (32), and a locking fastener (33). The contact mechanism includes a moving contact (41) and a stationary contact (42). The moving contact (41) is movably mounted on the second rotating shaft (12), and the stationary contact (42) is fixedly mounted within the housing (10). The handle (20) and the jump fastener (32) are connected by a first connecting rod (51), and the jump fastener (32) and the moving contact (41) are connected by a second connecting rod (52). During normal closing or opening operations, the locking element (33) engages with the tripping element (32), and the handle (20) is driven by the first connecting rod (51) to drive the mechanism seat (31) to rotate around the first rotating shaft (11), so as to drive the moving contact (41) to move closer to or away from the stationary contact (42) through the tripping element (32) and the second connecting rod (52); during fault tripping, the locking element (33) disengages from the tripping element (32), and the moving contact (41) is driven to rotate around the second rotating shaft (12) to move away from the stationary contact (42).

2. The circuit breaker according to claim 1, characterized in that, One end of the moving contact (41) is provided with a moving contact point (411), and the other end of the moving contact (41) away from the moving contact point (411) is provided with a sliding groove (412). The second rotating shaft (12) passes through the sliding groove (412) so that the moving contact (41) is movably mounted on the second rotating shaft (12).

3. The circuit breaker according to claim 1, characterized in that, The contact mechanism also includes a contact spring (43), the first end of which abuts against the moving contact (41) and the second end of which abuts against the housing (10). The contact spring (43) is used to drive the moving contact (41) to move toward the side away from the stationary contact (42).

4. The circuit breaker according to claim 3, characterized in that, The first end of the second connecting rod (52) is hinged to the jump fastener (32), and the second end is hinged to the moving contact (41). The contact spring (43) and the moving contact (41) abut against each other between the hinge point of the second connecting rod (52) and the moving contact (41) and the second rotating shaft (12).

5. The circuit breaker according to claim 1, characterized in that, The contact mechanism also includes a bracket (44) and an arc-blocking plate (441) disposed on the bracket (44). The bracket (44) is rotatably mounted on the second rotating shaft (12). The second end of the second connecting rod (52) passes through the bracket (44) and the moving contact (41). The arc-blocking plate (441) extends along the movement trajectory of the moving contact (41) and is used to block the electric arc generated when the moving contact (41) and the stationary contact (42) are separated from moving towards the side closer to the second rotating shaft (12).

6. The circuit breaker according to claim 1, characterized in that, The mechanism seat (31) and the locking element (33) are rotatably mounted on the first rotating shaft (11). The first end of the first connecting rod (51) is hinged to the handle (20), and the second end passes through the jump fastener (32) and the mechanism seat (31). When the locking element (33) and the jump fastener (32) are unfastened, the jump fastener (32) rotates around the first end of the first connecting rod (51) under the drive of the second connecting rod (52).

7. The circuit breaker according to claim 1, characterized in that, It also includes a release element (60), which is rotatably installed inside the housing (10). When the release element (60) is driven to rotate, it can drive the locking element (33) to release from the jumping element (32).

8. The circuit breaker according to claim 7, characterized in that, The locking member (33) is provided with a boss (331), and the release member (60) abuts against the boss (331) to push the locking member (33) and the release member (32) to release.

9. The circuit breaker according to claim 7, characterized in that, It also includes a trip unit (70), the push rod (71) of the trip unit (70) is linked with the tripping component (60) to drive the tripping component (60) to rotate; the trip unit (70) includes a current coil and a voltage coil. When there is a short circuit fault, the current coil works to drive the push rod (71) to push out. When there is an overload, leakage, or remote control, the voltage coil works to drive the push rod (71) to push out.

10. The circuit breaker according to claim 1, characterized in that, The operating mechanism also includes a locking spring (34), which is sleeved on the first rotating shaft (11). The first end of the locking spring (34) abuts against the locking member (33) and the second end abuts against the mechanism seat (31). The locking spring (34) is used to provide a restoring force for the movement of the locking member (33) relative to the mechanism seat (31).

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