An operating mechanism and circuit breaker

Abstract

The application relates to the technical field of low-voltage electrical apparatus, in particular to an operating mechanism and a circuit breaker, which comprises a trip buckle, a connecting rod, an operating handle and an elastic reset member; a first rotating part for connecting with a circuit breaker shell is arranged on the operating handle; a second rotating part for connecting with a mechanism seat in the circuit breaker is arranged on the trip buckle; the rotating axes of the first rotating part and the second rotating part are parallel and spaced; the first end of the connecting rod is hinged with the operating handle, and the second end is connected with the trip buckle; an extension arm perpendicular to the rotating axis is arranged on the elastic reset member; during opening movement, the operating handle pushes the elastic reset member to move around the first rotating part, the extension arm pushes the trip buckle to move around the second rotating part and is locked with a locking piece arranged on the mechanism seat. The application can push the trip buckle to smoothly pass through the dead point through the elastic reset member under the condition that the elastic force is insufficient, so that the safety of the circuit breaker is effectively improved.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to an operating mechanism and a circuit breaker. Background Technology

[0002] As a key device for circuit protection, the circuit breaker must quickly disconnect the circuit to ensure the safety of equipment and personnel in the event of overload, short circuit, or other faults. Its working principle is generally as follows: When a fault current occurs, the trip unit inside the circuit breaker responds and drives the tripping mechanism, causing the latch to release. The mechanism seat, under the action of elastic elements such as energy storage springs, moves rapidly, driving the moving contact to complete the opening operation. Simultaneously, the operating handle also automatically switches from the closed position to the open position under the action of elastic force, providing external status indication.

[0003] During the tripping process, the trip latch re-establishes a locking relationship with the locking latch via the connecting rod to ensure that the circuit breaker remains in the tripped state. However, in the motion transmission chain, the connection structure between the connecting rod and the trip latch will have three collinear motion dead points, namely, the hinge point of the trip latch, the hinge point between the connecting rod and the trip latch, and the hinge point between the connecting rod and the operating handle are all on the same straight line, causing the mechanism to fail to form a mechanical self-locking mechanism.

[0004] Existing technology relies on the impact force generated by the release of a spring element within the operating handle, along with the inertia of moving parts, to cause the linkage and trip latch to cross the dead point and re-engage with the locking latch. However, this design has significant drawbacks: the spring element needs to maintain compressed energy storage for a long time under normal circuit breaker closing conditions. Over time, especially in harsh environments such as humid and dusty conditions, the spring's elasticity deteriorates, resulting in insufficient energy release. Simultaneously, dust accumulation hinders the free movement of the operating handle, causing it to lack sufficient force to break through the dead point during automatic tripping. Ultimately, this prevents the trip latch and locking latch from effectively engaging, leading to a failure of the circuit breaker's mechanical interlock, affecting its reliable tripping and safety indication, and creating safety hazards. Utility Model Content

[0005] The purpose of this application is to provide an operating mechanism and circuit breaker that can smoothly pass through the dead point by moving the trip lever through the elastic reset element when the elastic force is insufficient, thereby effectively improving the safety of the circuit breaker.

[0006] The embodiments of this application are implemented as follows: In a first aspect, this application provides an operating mechanism, including a trip latch, a connecting rod, an operating handle, and a resilient reset member; the operating handle has a first rotating part for connecting to the circuit breaker housing; the trip latch has a second rotating part for connecting to a mechanism seat inside the circuit breaker; the rotation axes of the first rotating part and the second rotating part are parallel and spaced apart; the first end of the connecting rod is hinged to the operating handle, and the second end is connected to the trip latch; the resilient reset member has an extension arm perpendicular to the rotation axis; during the tripping operation, the operating handle pushes the resilient reset member to move around the first rotating part, and the extension arm moves the trip latch to move around the second rotating part and locks it with a locking member provided on the mechanism seat.

[0007] As an optional implementation, the elastic reset member includes a torsion spring; one end of the torsion spring is connected to the extension arm, and the other end of the torsion spring is provided with a hook for attaching to the extension arm, and the torsion spring stores a preset elastic potential energy during deformation.

[0008] As an optional implementation, the torsion spring surrounds the first rotating part, and the central axis of the torsion spring is aligned with the central axis of the first rotating part.

[0009] As an optional implementation, the operating handle is provided with an abutment portion located outside the torsion spring; during the opening movement, the abutment portion contacts the hook and / or the extension arm and pushes the torsion spring to deform, and the extension arm moves the jump buckle around the second rotating part by elastic force.

[0010] As an optional implementation, during the closing motion, the abutment portion separates from the hook and / or extension arm.

[0011] As an optional implementation, the connecting rod has a bend between the first end and the second end; when the mechanism seat moves to the open position and the operating handle is in the closed position, the bend is used to avoid the second rotating part.

[0012] As an optional implementation, the geometric center of the connection between the jump buckle and the connecting rod forms a first line with the geometric center of the second rotating part; the geometric centers at both ends of the connecting rod form a second line. When the angle between the first line and the second line is ±10°, the extension arm moves the jump buckle to lock with the locking member.

[0013] As an optional implementation, the jump buckle is provided with a sliding groove, and the second end of the connecting rod is connected to the sliding groove; when the extension arm moves the jump buckle to disengage from the dead point position generated by the hinge between the jump buckle and the mechanism seat and the collinearity of the two ends of the connecting rod, the second end of the connecting rod slides from one end of the sliding groove to the other end.

[0014] As an optional implementation, the mechanism base is provided with a rotating shaft, and the second rotating part includes a slot connected to the rotating shaft.

[0015] Secondly, this application provides a circuit breaker, including a housing, the aforementioned operating mechanism, a mechanism base, and a locking element disposed on the mechanism; the operating mechanism and the mechanism base are installed inside the housing; during the opening movement, the operating handle of the operating mechanism pushes the elastic reset element to move around the first rotating part, and the extension arm moves the jumper to move around the second rotating part and locks it with the locking element.

[0016] The beneficial effects of this application include: The operating mechanism and circuit breaker provided in this application achieve reliable locking of the trip latch and the latch during the circuit breaker tripping process by setting an elastic reset component with a flexible structure and an extension arm, significantly improving the mechanism's operational stability and safety performance. During tripping, the operating handle drives the elastic reset component, whose extension arm directly actuates the trip latch to rotate around the second rotating part, driving the trip latch past the dead point and re-locking with the latch. This effectively avoids the jamming or locking failure problems caused by the three collinear dead points in traditional structures. Simultaneously, the elastic characteristics of the elastic reset component absorb the impact energy during tripping, reducing component wear, improving operational smoothness, and exhibiting good adaptability to assembly errors and environmental interference. This design not only solves the potential mechanical interlocking failure caused by insufficient impact force due to the slow reset speed of the operating handle, but also integrates transmission and reset functions, simplifies the structure, reduces maintenance costs, and thus comprehensively improves the reliability, durability, and safety indication accuracy of the circuit breaker under long-term operating conditions. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is one of the schematic diagrams of the operating mechanism and circuit breaker structure in the embodiments of this application; Figure 2 This is a second schematic diagram of the operating mechanism and circuit breaker structure in an embodiment of this application; Figure 3 This is the third schematic diagram of the operating mechanism and circuit breaker structure in the embodiments of this application; Figure 4 This is the fourth schematic diagram of the operating mechanism and circuit breaker structure in the embodiments of this application; Figure 5 This is the fifth schematic diagram of the operating mechanism and circuit breaker structure in the embodiments of this application.

[0019] Icons: 100-Jump buckle; 101-Linkage rod; 102-Operating handle; 103-Elastic reset component; 104-First rotating part; 105-Mechanism seat; 106-Second rotating part; 107-Extension arm; 108-Locking component; 109-Torsion spring; 110-Hook; 111-Abutting part; 112-Slide groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] Existing technology relies on the impact force generated by the release of a spring element within the operating handle, along with the inertia of moving parts, to propel the linkage and trip latch past the dead point and re-engage with the locking latch. However, this design has a significant drawback: the spring element needs to maintain compressed energy storage for an extended period during the circuit breaker's normal closing state. Over time, especially in harsh environments such as humid or dusty conditions, the spring's elasticity deteriorates, resulting in insufficient energy release. Furthermore, dust accumulation can hinder the free movement of the operating handle. Consequently, the operating handle lacks sufficient force to break through the dead point during automatic tripping, ultimately preventing the trip latch and locking latch from effectively engaging. This leads to a failure of the circuit breaker's mechanical interlock, affecting its reliable tripping and safety indication, and creating a safety hazard.

[0025] To solve the above technical problems, refer to Figure 1 , Figure 2 as well as Figure 3 As shown, this application provides an operating mechanism, including a trip latch 100, a connecting rod 101, an operating handle 102, and an elastic reset member 103; the operating handle 102 is provided with a first rotating part 104 for connecting to the circuit breaker housing; the trip latch 100 is provided with a second rotating part 106 for connecting to the mechanism seat 105 inside the circuit breaker; the rotation axes of the first rotating part 104 and the second rotating part 106 are parallel and spaced apart; the first end of the connecting rod 101 is hinged to the operating handle 102, and the second end is connected to the trip latch 100; the elastic reset member 103 is provided with an extension arm 107 perpendicular to the rotation axis; during the tripping operation, the operating handle 102 pushes the elastic reset member 103 to move around the first rotating part 104, and the extension arm 107 moves the trip latch 100 to move around the second rotating part 106 and locks it with a locking member 108 provided on the mechanism seat 105.

[0026] It should be noted that the circuit breaker operating mechanism provided in this application embodiment solves the problem of mechanical self-locking failure caused by the occurrence of three collinear dead points in the connection mechanism between the connecting rod 101 and the trip latch 100 during the opening process in the prior art through the structure and transmission cooperation of the elastic reset member 103.

[0027] Specifically, the operating mechanism includes a trip latch 100, a connecting rod 101, an operating handle 102, and an elastic reset member 103 with an extension arm 107. The operating handle 102 and the trip latch 100 are connected to the housing and the mechanism base 105 respectively through a first rotating part 104 and a second rotating part 106 that are parallel and spaced apart. The two ends of the connecting rod 101 are connected to the operating handle 102 and the trip latch 100 respectively, forming a transmission chain. When the circuit breaker automatically trips due to a fault, the operating handle 102 moves rapidly from the closed position to the open position under the action of the energy storage spring, pushing the elastic reset member 103 to rotate synchronously. During the movement, the extension arm 107 on it directly actuates the trip latch 100 to rotate around the second rotating part 106, thereby actively driving the trip latch 100 to re-establish the locking connection with the latch. This design changes the traditional mode of passively overcoming dead points by relying on inertia and impact force. By using the forced driving action of the extension arm 107 on the trip latch 100, the influence of the motion dead point of the three collinear points is effectively avoided, ensuring that the trip latch 100 and the latch are reliably connected, improving the stability and reliability of the tripping action, avoiding interlock failure caused by spring aging or environmental factors, and enhancing the safety and durability of the circuit breaker operation.

[0028] It should be noted that the elastic reset member 103 in this embodiment can undergo elastic deformation during the opening movement of the operating handle 102. Its extension arm 107 can generate a certain buffering and adaptive adjustment capability when the trip latch 100 is activated, effectively reducing rigid impact during transmission, reducing mechanical wear, and improving the service life of the mechanism. In the event of slight assembly errors or motion interference, self-compensation can be achieved through local deformation, enhancing the fault tolerance and operational stability of the mechanism, and ensuring reliable locking of the trip latch 100 and the locking latch.

[0029] The operating mechanism provided in this application embodiment, by setting an elastic reset member 103 with an elastic structure and an extension arm 107, achieves reliable locking of the trip latch 100 and the latch during the circuit breaker tripping process, significantly improving the stability and safety performance of the mechanism. During tripping, the operating handle 102 drives the elastic reset member 103 to move, and its extension arm 107 directly moves the trip latch 100 to rotate around the second rotating part 106, driving the trip latch 100 past the dead point and re-locking with the latch, effectively avoiding the jamming or locking failure problems caused by the three collinear dead points in traditional structures. Simultaneously, the elastic characteristics of the elastic reset member 103 itself can absorb the impact energy during tripping, reducing component wear, improving movement smoothness, and exhibiting good adaptability to assembly errors and environmental interference. This design not only solves the potential mechanical interlocking failure caused by insufficient impact force due to aging and corrosion of the spring inside the operating handle 102, but also integrates transmission and reset functions, simplifying the structure and reducing maintenance costs, thereby comprehensively improving the reliability, durability, and safety indication accuracy of the circuit breaker under long-term operating conditions.

[0030] Reference Figure 4 As shown, as an optional implementation, the elastic reset member 103 includes a torsion spring 109; one end of the torsion spring 109 is connected to the extension arm 107, and the other end of the torsion spring 109 is provided with a hook 110 for attaching to the extension arm 107, and the torsion spring 109 deforms to store a preset elastic potential energy.

[0031] It should be noted that in this embodiment, the elastic reset member 103 adopts a torsion spring 109 structure, which includes a torsion spring 109 with one end connected to the extension arm 107 and the other end provided with a hook 110 for attaching to the extension arm 107. When the circuit breaker is closed, the torsion spring 109 is in a pre-deformed state and stores a preset elastic potential energy.

[0032] When the circuit breaker is normally closed, the operating handle 102 does not drive the elastic reset member 103 to rotate, and the extension arm 107 is in a suspended or loose state. When an overload or short circuit fault occurs in the circuit, the circuit breaker triggers the tripping action. The latch 108 unlocks from the trip latch 100 under the action of the trip unit, the mechanism seat 105 quickly returns to the open position, and the operating handle 102 moves rapidly from the closed position to the open position under the action of the internal energy storage spring. At this time, the operating handle 102 drives the torsion spring 109 and its extension arm 107 to rotate synchronously. With the assistance of the elastic force of the torsion spring 109, the extension arm 107 more effectively moves the trip latch 100 to rotate around its second rotating part 106, driving the trip latch 100 to pass the dead point in the transmission chain of the connecting rod 101, and quickly and reliably re-establish the locking relationship with the latch.

[0033] The embodiments of this application not only enhance the driving force of the trip button 100 action and improve the reliability of the tripping response, but also realize the integrated function of elastic reset and auxiliary drive by utilizing the torsion spring 109 structure, thereby improving the compactness and stability of the mechanism.

[0034] It should be noted that the elastic reset member 103 also includes an elastic sheet or other elastic structural member.

[0035] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, in one optional embodiment, the torsion spring 109 surrounds the first rotating part 104, and the central axis of the torsion spring 109 is aligned with the central axis of the first rotating part 104.

[0036] It should be noted that in this embodiment, the torsion spring 109 is arranged around the first rotating part 104 of the operating handle 102, and its central axis coincides with the central axis of the first rotating part 104, thus achieving coaxial arrangement. This structural design allows the torsion spring 109 to deform uniformly around the rotation center of the operating handle 102 during operation, resulting in more symmetrical and stable force distribution. This effectively avoids uneven twisting, stress concentration, or spring misalignment caused by eccentric installation, improving motion accuracy and fatigue life. When the circuit breaker is tripped, the rotation of the operating handle 102 drives the extension arm 107 at one end of the torsion spring 109 to rotate close to the trip latch 100. The spring undergoes torsional deformation around the central axis of the first rotating part 104, driving the extension arm 107 to move the trip latch 100 around the second rotating part 106, completing the locking action between the trip latch 100 and the latch. This coaxial arrangement not only optimizes the spatial layout and improves the structural compactness, but also ensures that the driving force transmission path of the elastic reset component 103 is the shortest and the response is faster, significantly enhancing the reliability and consistency of mechanical interlocking during the tripping process.

[0037] Reference Figure 2 as well as Figure 3 As shown, in one optional implementation, the operating handle 102 is provided with an abutment portion 111 located outside the torsion spring 109; during the opening movement, the abutment portion 111 contacts the hook 110 and / or the extension arm 107 and pushes the torsion spring 109 to deform, and the extension arm 107 moves the jumper 100 around the second rotating part 106 by elastic force.

[0038] It should be noted that the operating handle 102 is provided with an abutment portion 111 located outside the torsion spring 109. During the opening process, the abutment portion 111 contacts the hook 110 and the extension arm 107 of the torsion spring 109 and applies a pushing force, directly driving the torsion spring 109 to undergo torsional deformation. In the circuit breaker open state, the operating handle 102 rotates to cause the abutment portion 111 to press the hook 110 or the extension arm 107, forcing the torsion spring 109 to increase energy storage around the central axis of the first rotating part 104, forming a stable preset elastic potential energy; then, the extension arm 107 drives the trip latch 100 to rotate around the second rotating part 106 by relying on the stored elastic potential energy, realizing the reliable engagement of the trip latch 100 and the latch.

[0039] Reference Figure 1 As shown, in one optional implementation, during the closing motion, the abutment portion 111 separates from the hook 110 and / or the extension arm 107. Additionally, the torsion spring 109 releases its elastic potential energy to push the abutment portion 111 back, reducing the force required for manual closing by the operator and facilitating the closing operation.

[0040] It should be noted that when the circuit breaker performs the closing action, the operating handle 102 rotates from the open position to the closed position. The abutment part 111 on the handle disengages from the hook 110 and extension arm 107 of the torsion spring 109 during the initial movement, achieving separation. Simultaneously, the elastic potential energy stored in the torsion spring 109 during the opening state is released during the closing process. Its restoring force not only drives its own reset but also acts in the opposite direction on the abutment part 111 of the operating handle 102 or related transmission components, generating an auxiliary pushing force. This counter-pushing force is in the same direction as the closing movement of the operating handle 102, partially offsetting the mechanical friction and internal spring resistance required to close the circuit, thereby effectively reducing the force required for manual closing by the operator. This application embodiment utilizes a collaborative mechanism of "separation of the contact part 111 + elastic reverse push" to ensure that the torsion spring 109 reliably stores energy and drives the trip latch 100 to lock during the tripping operation. At the same time, it cleverly utilizes the energy storage and release process to assist the closing operation. This not only improves the reliability of the tripping interlock but also significantly improves the human-machine operation experience, making the closing action more convenient and smooth, reducing operator fatigue. It is especially beneficial for improving the overall performance and safety of the circuit breaker in application scenarios with frequent operation or strict requirements for operating force.

[0041] Reference Figure 1 As shown, in one optional implementation, the connecting rod 101 has a bend between the first end and the second end; when the mechanism base 105 moves to the open position and the operating handle 102 is in the closed position, the bend is used to avoid the second rotating part 106.

[0042] It should be noted that when the circuit breaker encounters a short circuit or other fault, the locking element 108 unlocks from the trip latch 100 under the action of the trip unit. The mechanism base 105 and the moving contact quickly return to the open position. However, the operating handle 102 may remain temporarily in the closed position due to differences in transmission timing or inertia. At this time, the connecting rod 101, as a key component connecting the operating handle 102 and the trip latch 100, collides with the second rotating part 106 on the trip latch 100. By providing a bend in the middle of the connecting rod 101, the installation space of the second rotating part 106 can be effectively avoided during this transition phase, ensuring that the mechanism base 105 completes the rapid tripping action without obstruction. This avoidance design ensures the timeliness of fault response and the reliability of mechanical action, preventing jamming, deformation, or tripping failure caused by interference between the connecting rod 101 and the rotating parts. When the subsequent operating handle 102 begins to move towards the open position under the drive of the elastic element, the connecting rod 101 rotates with its hinge point, and the bent part automatically disengages from the avoidance area, restoring normal transmission function. This structure achieves compatibility of movement timing and compact spatial layout by optimizing the geometry of the connecting rod 101 without adding extra parts, significantly improving the operational reliability and structural safety of the circuit breaker under transient fault conditions.

[0043] When the handle is reset to near the disconnected position, the geometric center of the connection between the jump buckle 100 and the connecting rod 101 forms a first line with the geometric center of the second rotating part 106; the geometric centers at both ends of the connecting rod 101 form a second line. When the angle between the first line and the second line is ±10°, the extension arm 107 moves the jump buckle 100 to lock with the locking member 108.

[0044] It should be noted that when the first and second connecting lines are collinear and reach the dead point position, the extension arm 107 abuts against the jump buckle 100 and moves the jump buckle 100 to lock with the locking fastener 108.

[0045] Alternatively, if needed, the first and second connecting lines can be nearly collinear. Nearly collinearity can be understood as the extension arm 107 abutting against the jump buckle 100 when the angle between the first and second connecting lines is ±10°, and then moving the jump buckle 100 to lock it against the locking element 108. (Refer to...) Figure 5 As shown, in one optional implementation, the jump buckle 100 is provided with a slide groove 112, and the second end of the connecting rod 101 is connected to the slide groove 112; when the extension arm 107 moves the jump buckle 100 to disengage from the hinge point between the jump buckle 100 and the mechanism seat 105 and the dead point position generated by the collinearity of the two ends of the connecting rod 101, the second end of the connecting rod 101 slides from one end of the slide groove 112 to the other end.

[0046] It should be noted that the trip latch 100 in this embodiment of the application is provided with a sliding groove 112, and the second end of the connecting rod 101 is slidably connected in the sliding groove 112 to form a sliding hinge structure. When the circuit breaker is triggered to trip due to a fault, the operating handle 102 drives the elastic reset member 103 to move, and its extension arm 107 actively moves the trip latch 100 to rotate around the second rotating part 106, so as to disengage from the dead point of motion formed by the hinge point between the trip latch 100 and the mechanism seat 105 and the line connecting the two ends of the connecting rod 101. During this process, since the second end of the connecting rod 101 and the trip latch 100 are slidably connected through the sliding groove 112, the connection point between the connecting rod 101 and the trip latch 100 can slide from one end to the other end in the sliding groove 112, effectively adapting to the change in the movement trajectory between the two and avoiding jamming or stress concentration caused by rigid connection. This sliding fit structure allows the connecting rod 101 to adjust its posture through sliding during the initial rotation of the trip latch 100, smoothly passing the mechanical dead point, thereby ensuring that the trip latch 100 can reliably re-establish locking with the latch. This design guides the relative displacement of the end of the connecting rod 101 through the slide groove 112, enhancing the flexibility and fault tolerance of the transmission mechanism, significantly improving the smoothness and reliability of the tripping action, and ensuring stable operation even with assembly errors or component deformation, further guaranteeing the realization of the circuit breaker's mechanical interlocking function.

[0047] As an optional implementation, the mechanism base 105 is provided with a rotating shaft, and the second rotating part 106 includes a slot that connects to the rotating shaft. The length of the slot is greater than one times the diameter of the rotating shaft and less than 1.5 times its diameter.

[0048] It should be noted that the mechanism base 105 in this embodiment of the application is provided with a rotating shaft, and the second rotating part 106 on the trip latch 100 is connected to the rotating shaft through a slot to form a movable hinge structure. The length of the slot is designed to be greater than the diameter of the rotating shaft but less than 1.5 times the diameter of the rotating shaft. The technical principle is that while ensuring that the trip latch 100 can realize the basic rotation function around the rotating shaft, a small relative axial displacement or assembly tolerance is allowed between the trip latch 100 and the mechanism base 105, thereby effectively absorbing the stress concentration problem caused by manufacturing errors, assembly deviations or transient force deformation during the tripping operation. This slot structure with limited clearance retains the stability of the hinge connection and avoids swaying or positioning inaccuracy caused by excessive degrees of freedom of movement.

[0049] This application provides a circuit breaker, including a housing, the aforementioned operating mechanism, a mechanism base 105, and a locking member 108 disposed on the mechanism; the operating mechanism and the mechanism base 105 are installed inside the housing; during the opening movement, the operating handle 102 of the operating mechanism pushes the elastic reset member 103 to move around the first rotating part 104, and the extension arm 107 moves the trip latch 100 around the second rotating part 106 and locks it with the locking member 108.

[0050] The circuit breaker provided in this application embodiment significantly improves the reliability of the tripping action and the stability of the mechanical interlock by integrating the optimized operating mechanism into the housing and cooperating with the mechanism base 105 and the locking element 108. In the event of an overload or short circuit fault, the operating handle 102 drives the elastic reset element 103 to move under the action of the energy storage spring. Its extension arm 107 actively moves the trip latch 100 to rotate around the second rotating part 106, forcibly driving the trip latch 100 to cross the motion dead point and reliably lock with the locking element 108, effectively avoiding the jamming or locking failure problem caused by the collinearity of the three points of the connecting rod 101 in the traditional structure. At the same time, the coaxial torsion spring 109 structure of the elastic reset element 103, the bending part avoidance design of the connecting rod 101, the sliding connection of the slide groove 112, and the slot limit cooperation, etc., work together to achieve precise transmission, stress release and motion avoidance during the tripping process, greatly improving the fault tolerance, durability and response speed of the mechanism. Furthermore, this structure automatically stores energy during opening and releases assistance during closing, reducing manual operation effort and improving the human-machine experience. The overall solution not only solves the long-standing problem of unreliable opening indication due to spring aging, but also enhances the operational safety and consistency of the circuit breaker in harsh environments, offering comprehensive technical advantages such as compact structure, stable performance, and low maintenance costs.

[0051] The above description is merely a preferred 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.

Claims

1. An operating mechanism, characterized in that, The circuit breaker includes a trip latch (100), a connecting rod (101), an operating handle (102), and a resilient reset member (103). The operating handle (102) has a first rotating part (104) for connection with the circuit breaker housing. The trip latch (100) has a second rotating part (106) for connection with a mechanism seat (105) inside the circuit breaker. The rotation axes of the first rotating part (104) and the second rotating part (106) are parallel and spaced apart. The first rotating part (104) of the connecting rod (101) has a first rotating part (105) for connection with the circuit breaker housing. One end is hinged to the operating handle (102), and the second end is connected to the trip latch (100); the elastic reset member (103) is provided with an extension arm (107) perpendicular to the rotation axis; when the circuit breaker is opened, the operating handle (102) pushes the elastic reset member (103) to move around the first rotating part (104), and the extension arm (107) moves the trip latch (100) around the second rotating part (106) and locks it with the locking member (108) provided on the mechanism seat (105).

2. The operating mechanism according to claim 1, characterized in that, The elastic reset member (103) includes a torsion spring (109); one end of the torsion spring (109) is connected to the extension arm (107), and the other end of the torsion spring (109) is provided with a hook (110) for attaching to the extension arm (107). The torsion spring (109) stores a preset elastic potential energy by deformation.

3. The operating mechanism according to claim 2, characterized in that, The torsion spring (109) surrounds the first rotating part (104), and the central axis of the torsion spring (109) is consistent with the central axis of the first rotating part (104).

4. The operating mechanism according to claim 2, characterized in that, The operating handle (102) is provided with an abutment part (111) located outside the torsion spring (109); when the circuit breaker is opened, the abutment part (111) contacts the hook (110) and / or the extension arm (107) and pushes the torsion spring (109) to deform, and the extension arm (107) moves the jump buckle (100) around the second rotating part (106) by elastic force.

5. The operating mechanism according to claim 4, characterized in that, During the closing motion, the abutment (111) separates from the hook (110) and / or the extension arm (107).

6. The operating mechanism according to any one of claims 1-5, characterized in that, The connecting rod (101) has a bend between its first and second ends; when the mechanism seat (105) moves to the open position and the operating handle (102) is in the closed position, the bend is used to avoid the second rotating part (106).

7. The operating mechanism according to any one of claims 1-5, characterized in that, The geometric center of the connection between the jump buckle (100) and the connecting rod (101) forms a first line with the geometric center of the second rotating part (106); the geometric centers at both ends of the connecting rod (101) form a second line. When the angle between the first line and the second line is ±10°, the extension arm (107) moves the jump buckle (100) to lock with the locking member (108).

8. The operating mechanism according to any one of claims 1-5, characterized in that, The jump buckle (100) is provided with a slide groove (112), and the second end of the connecting rod (101) is connected to the slide groove (112). When the extension arm (107) moves the jump buckle (100) to disengage from the hinge point between the jump buckle (100) and the mechanism seat (105) and the dead point position generated by the collinearity of the two ends of the connecting rod (101), the second end of the connecting rod (101) slides from one end of the slide groove (112) to the other end.

9. The operating mechanism according to any one of claims 1-5, characterized in that, The mechanism base (105) is provided with a rotating shaft, and the second rotating part (106) includes a slot hole connected to the rotating shaft.

10. A circuit breaker, characterized in that, It includes a housing, an operating mechanism as described in any one of claims 1-9, a mechanism seat (105), and a locking element (108) disposed on the mechanism; the operating mechanism and the mechanism seat (105) are installed inside the housing; when the circuit breaker is opened, the operating handle (102) of the operating mechanism pushes the elastic reset element (103) to move around the first rotating part (104), and the extension arm (107) moves the trip latch (100) around the second rotating part (106) and locks it with the locking element (108).

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