A circuit breaker overload alarm trip mechanism

Abstract

The utility model discloses a circuit breaker overload alarm trip mechanism, including setting in the overload trip piece, alarm trip piece, bimetallic strip and the drive part of the linkage setting in bimetallic strip one end in circuit breaker casing, drive part includes the first hook portion of extension buckle on alarm trip piece, and the second hook portion of extension buckle on overload trip piece, and drive part forms the spacing cooperation with alarm trip piece and overload trip piece through first hook portion and second hook portion respectively, and first hook portion and second hook portion staggered setting in drive part far from bimetallic strip one end, make bimetallic strip's bending action first drive first hook portion and alarm trip piece separate, then drive second hook portion and overload trip piece separate, thereby realized the physical separation of both actions on bimetallic strip bending stroke, avoided the mutual interference, can be triggered corresponding action according to the order of alarm trip first, overload trip later, promoted the stability and reliability of mechanism work.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to an overload alarm tripping mechanism for a circuit breaker. Background Technology

[0002] An oil-immersed circuit breaker is a power switching device that uses highly insulating oil as the dielectric. In power systems, oil-immersed circuit breakers are mainly used for the protection and control of power transmission and distribution networks. They can interrupt and isolate fault currents in circuits, protecting electrical equipment and personnel safety. When a circuit experiences overload, undervoltage, short circuit, or other faults, the circuit breaker can automatically disconnect the circuit, preventing the safety of personnel and the normal operation of equipment from being endangered due to circuit faults.

[0003] Existing oil-immersed circuit breakers have overload protection functions. Overload protection is achieved by the circuit breaker's overload tripping mechanism. Since oil-immersed circuit breakers are installed inside the transformer tank, the cause of the tripping is not known to the outside world. Therefore, existing oil-immersed circuit breakers are designed with an overload alarm function followed by overload tripping. This overload tripping mechanism mainly includes a double metal plate connected in series in the main circuit of the circuit breaker, and an overload tripping element and an alarm tripping element rotatably disposed within the housing. A bending surface is provided at one end of the double metal plate, so that the overload tripping element and the alarm tripping element are respectively fastened to the same bending surface of the double metal plate. The bending action of the double metal plate sequentially triggers the tripping of the alarm tripping element and the overload tripping element. The overload trip and alarm trip share the same bending surface of the bimetallic strip. The bending of the bimetallic strip under overload current is a continuous, gradual process. According to design requirements, the alarm trip activates at a smaller bending displacement (trip alarm), while the overload trip activates only at a larger bending displacement (trip trip). The actions of the two components cannot be physically decoupled along the bending stroke of the bimetallic strip. This results in the overload trip failing to trip according to the specified timing after the alarm trip completes its tripping action. Essentially, the mechanical connection design of the two components fails to properly distinguish between the triggering sequence and the independence of force transmission, a technical challenge that urgently needs to be addressed by those skilled in the art. Utility Model Content

[0004] Therefore, the purpose of this utility model is to overcome the shortcomings of the existing technology and provide an overload alarm tripping mechanism that reasonably distinguishes the triggering sequence and the independence of force transmission, and realizes the physical separation of the alarm trigger point and the overload tripping trigger point on the double metal bending stroke.

[0005] To achieve the above objectives, this utility model provides an overload alarm tripping mechanism for a circuit breaker, including an overload tripping component and an alarm tripping component rotatably disposed within the circuit breaker housing, as well as a bimetallic strip connected to the main circuit of the circuit breaker and a driving component linked to one end of the bimetallic strip.

[0006] The driving component includes a first hook portion extending and abutting the alarm tripping component, and a second hook portion extending and abutting the overload tripping component. The driving component forms a limiting engagement with the alarm tripping component and the overload tripping component respectively through the first hook portion and the second hook portion to maintain relative position positioning. The first hook portion and the second hook portion are staggered and arranged at the end of the driving component away from the bimetallic strip.

[0007] When the bimetallic strip bends, it first causes the second hook of the driving component to separate from the alarm tripping component, and then causes the second hook to separate from the overload tripping component. After the alarm tripping component is separated from the driving component, it rotates to trigger the connection of the alarm circuit structure. After the overload tripping component is separated from the driving component, it rotates to trigger the tripping action of the contact mechanism.

[0008] As a preferred embodiment, the alarm release component is provided with a first release platform that is connected to the first hook portion to form a positioning engagement, and the first hook portion restricts the rotation of the alarm release component when it engages with the first release platform.

[0009] As a preferred embodiment, the overload release member is provided with a second release platform that is connected to the second hook to form a positioning engagement, and the second hook engages with the second release platform to restrict the rotation of the overload release member.

[0010] As a preferred embodiment, the first hook and the second hook are staggered L-shaped hooks, and the vertical length of the second hook is greater than the vertical length of the first hook.

[0011] As a preferred embodiment, the latching connection distance between the first hook and the first release platform is less than the fastening connection distance between the second hook and the second release platform.

[0012] As a preferred embodiment, the driving component has a sheet-like structure and extends along the length of the bimetallic strip and is fixed to one end of the bimetallic strip. The bimetallic strip can be oscillatingly disposed within the circuit breaker housing via an adjustment assembly.

[0013] As a preferred embodiment, the contact mechanism includes a movable bracket rotatably disposed within the circuit breaker housing and a movable contact disposed on the movable bracket, as well as an operating component that drives the movable bracket and the movable contact to perform opening and closing movements. A opening spring is connected between the movable bracket and the circuit breaker housing. A limiting plate located on the movement path of the overload tripping component is rotatably disposed within the circuit breaker housing. The movable bracket is engaged with the bottom groove of the limiting plate. After the overload tripping component releases the limiting engagement with the driving component, it pushes the limiting plate to separate from the movable bracket.

[0014] As a preferred embodiment, the overload tripping component has a second protrusion on one side, and a tripping spring connected to the second protrusion is provided inside the circuit breaker housing. Under the action of the tripping spring, the overload tripping component pushes the limiting plate through the second protrusion.

[0015] As a preferred embodiment, the alarm circuit structure includes two alarm terminals disposed on the circuit breaker housing and a spring member for connecting or disconnecting the circuit between the two alarm terminals. The spring member includes a first elastic foot that contacts one of the alarm terminals and a first elastic foot that connects to the alarm tripping member. When the driving member separates from the alarm tripping member, the spring member drives the alarm tripping member to rotate and connects the two alarm terminals.

[0016] As a preferred embodiment, the alarm tripping component has a first protrusion on one side, and the first elastic foot is hooked onto the first protrusion.

[0017] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0018] 1. In the overload alarm tripping mechanism provided by this utility model, based on the linkage between the bimetallic strip and the driving component, the first hook and the second hook on the driving component are staggered, and the first hook and the second hook respectively form a limiting cooperation with the alarm tripping component and the overload tripping component. This ensures that when the bimetallic strip bends, the first hook first separates from the alarm tripping component, and then the second hook separates from the overload tripping component. This cleverly utilizes the spatial position difference and bending displacement difference, thus enabling the alarm tripping component to operate with a smaller bending displacement and the overload tripping component to operate with a larger bending displacement, thereby controlling the bending motion of the bimetallic strip. The process achieves physical separation of the two actions, avoiding mutual interference. It solves the problem in the existing technology where the overload tripping component cannot trip according to the specified sequence after the alarm tripping component completes its tripping action. This overload alarm tripping mechanism directly cooperates with the alarm tripping component and the overload tripping component through the two hooks of the driving component. It ensures that when the line is overloaded, the overload alarm and overload tripping of the circuit breaker are independently triggered by the two hooks of different positions and different timing actions on the driving component. This reduces the risk of mechanical interference between the two actions, ensures accurate and reliable action sequence, and enables the mechanism to respond to overload situations more promptly, thereby improving product safety.

[0019] 2. In the overload alarm tripping mechanism provided by this utility model, the driving component, through the first hook and the second hook, respectively forms a limiting cooperation with the alarm tripping component and the overload tripping component, which can maintain the relative position positioning. When the bimetallic strip does not bend sufficiently, it ensures that the alarm tripping component and the overload tripping component will not move arbitrarily. When the bimetallic strip changes according to the preset bending stroke, it can strictly trigger the corresponding action in the order of alarm tripping first and overload tripping later, so that the action sequence of the entire overload alarm tripping process is accurate and reliable, and improves the stability and reliability of the mechanism.

[0020] 3. In the overload alarm tripping mechanism provided by this utility model, the first hook is engaged with the first tripping platform of the alarm tripping component, and the second hook is engaged with the second tripping platform of the overload tripping component. When the bimetallic strip begins to bend due to overload and heat, it drives the drive plate to displace and first act on the first hook, which is located further forward, causing the first hook to disengage from the alarm tripping component. This causes the alarm tripping component to rotate and trigger the alarm circuit structure connector, thus realizing the overload alarm function. At this time, since the second hook is located further back, the torque application point is farther away, and the displacement required for tripping has not yet been reached. Therefore, it remains engaged with the overload tripping component. After the alarm action is completed, as the bimetallic strip continues to bend and reaches a greater displacement, it acts on the second hook to disengage from the overload tripping component, triggering the tripping action of the contact mechanism. This structural design physically separates the two actions of the alarm tripping component and the overload tripping component along the bending stroke of the bimetallic strip, ensuring that the overload alarm action always occurs before the overload tripping action, and that the overload tripping action is not disturbed by the completion of the overload alarm action.

[0021] 4. In the overload alarm tripping mechanism provided by this utility model, the first hook and the second hook are staggered L-shaped hooks. Through the difference in the vertical length and engagement distance of the two hooks, the tripping actions of the two hooks do not interfere with each other, thereby achieving the purpose of the alarm action occurring before the tripping action. According to the fact that the bending of the bimetallic strip is a continuous process, the rotation angle of the driving component also increases continuously. When the driving component rotates with the bimetallic strip by the same angle, the linear displacement generated by the end of the second hook in the tangential direction will be greater than the linear displacement generated by the end of the first hook. That is, when the bimetallic strip bends, the first hook with the shorter vertical section and smaller engagement distance will disengage from the alarm tripping component first, thereby triggering the alarm action; as the bending amount of the bimetallic strip increases, the second hook will disengage from the overload tripping component, thereby triggering the overload tripping action. This structural setting can accurately control the tripping sequence, optimize force transmission, adapt to the characteristics of the bimetallic strip, and enhance the reliability and anti-interference of the action, thereby significantly improving the reliability and accuracy of the overload protection function of the oil-immersed circuit breaker. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overload alarm tripping mechanism of this utility model.

[0024] Figure 2 This is a three-dimensional structural diagram of the overload alarm tripping mechanism of this utility model;

[0025] Figure 3 This is a schematic diagram showing the connection between the drive component, the overload tripping component, and the alarm tripping component of this utility model.

[0026] Figure 4 This is a partially enlarged structural diagram of the spring component and alarm terminal of this utility model.

[0027] Explanation of reference numerals in the attached drawings: 1. Alarm tripping component; 11. First tripping platform; 11. First boss; 2. Overload tripping component; 21. Second tripping platform; 22. Second boss; 3. Bimetallic strip; 31. Adjustment assembly; 4. Drive component; 41. First hook; 42. Second hook; 5. Contact mechanism; 51. Moving bracket; 52. Moving contact; 53. Stationary contact; 54. Opening spring; 55. Operating assembly; 56. Limit plate; 6. Tripping spring; 7. Spring component; 71. First elastic foot; 72. Second elastic foot; 8. Alarm terminal; 9. Circuit breaker housing. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0031] Example

[0032] This embodiment provides, as follows: Figure 1-4 The circuit breaker overload alarm tripping mechanism shown includes an overload tripping component 2 and an alarm tripping component 1 rotatably disposed within the circuit breaker housing 9, a bimetallic strip 3 connected to the main circuit of the circuit breaker, and a driving component 4 linked to one end of the bimetallic strip 3. The driving component 4 includes a first hook portion 41 extending and abutting against the alarm tripping component 1, and a second hook portion 42 extending and abutting against the overload tripping component. The driving component 4 forms a limiting engagement with the alarm tripping component 1 and the overload tripping component through the first hook portion 41 and the second hook portion 42, respectively, to maintain relative positional positioning. The first hook 41 and the second hook 42 are staggered and disposed at the end of the driving member 4 away from the bimetallic strip 3. When the bimetallic strip 3 bends, it first drives the second hook 42 of the driving member 4 to separate from the alarm tripping member 1, and then drives the second hook 42 to separate from the overload tripping member. After the alarm tripping member 1 is separated from the driving member 4, it rotates to trigger the connection of the alarm circuit structure, that is, to trigger the overload alarm action of the circuit breaker. After the overload tripping member 2 is separated from the driving member 4, it rotates to trigger the tripping action of the contact mechanism 5, that is, to trigger the overload tripping action of the circuit breaker.

[0033] The above-described implementation method is the core technical solution of this embodiment. Based on the linkage between the bimetallic strip 3 and the driving component 4, the first hook 41 and the second hook 42 on the driving component 4 are staggered, and the first hook 41 and the second hook 42 respectively form a limiting engagement with the alarm tripping component 1 and the overload tripping component. This ensures that when the bimetallic strip 3 bends, it first causes the first hook 41 to separate from the alarm tripping component 1, and then causes the second hook 42 to separate from the overload tripping component. This cleverly utilizes the spatial position difference and bending displacement difference. This design enables the alarm tripping component 1 to operate with a smaller bending displacement (tripping triggers an alarm), and the overload tripping component to operate with a larger bending displacement (tripping triggers a trip). The bimetallic strip 3 achieves physical separation of the two actions during its bending stroke, avoiding mutual interference. This solves the problem in the prior art where the overload tripping component cannot trip according to the specified timing after the alarm tripping component 1 completes its tripping action. This overload alarm tripping mechanism directly cooperates with the alarm tripping component 1 and the overload tripping component through the two hooks of the drive component 4. This ensures that when an overload occurs in the line, the overload alarm and overload tripping of the circuit breaker are independently triggered by the two hooks of the drive component 4 at different positions and with different timing actions. This reduces the risk of mechanical interference between the two actions, ensures accurate and reliable action sequence, improves the response speed of the action, and enables the mechanism to react to overload situations more promptly, thereby improving product safety.

[0034] In a further preferred configuration, the alarm release member 1 is provided with a first release platform 11 that is connected to the first hook portion 41 to form a positioning engagement, and the first hook portion 41 restricts the rotation of the alarm release member 1 when it engages with the first release platform 11; correspondingly, the overload release member 2 is provided with a second release platform 21 that is connected to the second hook portion 42 to form a positioning engagement, and the second hook portion 42 restricts the rotation of the overload release member 2 when it engages with the second release platform 21. When the bimetallic strip 3 begins to bend due to overload and heat, it drives the drive plate to displace and first act on the first hook 41, which is located further forward. This causes the first hook 41 to disengage from the alarm tripping component 1, causing the alarm tripping component 1 to rotate and trigger the alarm circuit structure connector, thus realizing the overload alarm function. At this time, since the second hook 42 is located further back, the torque application point is farther away, and the displacement required for tripping has not yet been reached. Therefore, it remains engaged with the overload tripping component. After the alarm action is completed, as the bimetallic strip 3 continues to bend and reaches a greater displacement, the second hook 42 is acted on to disengage from the overload tripping component, thereby triggering the tripping action of the contact mechanism 5. This structural design physically separates the two actions of the alarm tripping component 1 and the overload tripping component 2 along the bending stroke of the bimetallic strip 3, ensuring that the overload alarm action always occurs before the overload tripping action, and that the overload tripping action is not disturbed by the completion of the overload alarm action.

[0035] like Figure 2-4As shown, the first hook 41 and the second hook 42 are staggered L-shaped hooks. The vertical length of the second hook 42 is greater than the vertical length of the first hook 41. This L-shaped hook design provides good rigidity and fastening stability. The hook is not easily deformed and can effectively maintain the relative position of the driving component 4 with the alarm release component 1 and the overload release component 2. Furthermore, the latching connection distance between the first hook 41 and the first release platform 11 is less than the fastening connection distance between the second hook 42 and the second release platform 21. In this structural design, the second hook 42 has a longer vertical section and a greater latching distance to the second tripping platform compared to the first hook 41. This difference in the vertical length and latching distance between the two hooks ensures that their tripping actions do not interfere with each other, thus achieving the goal of the alarm action occurring before the tripping action. Since the bending of the bimetallic strip 3 is a continuous process, the rotation angle of the driving member 4 also increases continuously. When the driving member 4 rotates the same angle as the bimetallic strip 3, the linear displacement of the end of the second hook 42 in the tangential direction will be greater than that of the first hook 41. The linear displacement generated at the end of hook 41 is such that when the bimetallic strip 3 bends, the first hook 41, with its shorter vertical section and smaller engagement distance, first disengages from the alarm tripping member 1, thereby triggering the alarm action; as the bending amount of the bimetallic strip 3 increases, the second hook 42 disengages from the overload tripping member 2, thereby triggering the overload tripping action. This structural design can precisely control the tripping sequence, optimize force transmission, adapt to the characteristics of the bimetallic strip, and enhance the reliability and anti-interference of the action, thereby significantly improving the reliability and accuracy of the overload protection function of the oil-immersed circuit breaker.

[0036] The driving component 4 has a sheet-like structure and extends along the length of the bimetallic strip 3, fixed to one end of the bimetallic strip 3. The bimetallic strip 3 can be swung and adjusted within the circuit breaker housing 9 via the adjusting component 31, thus adjusting the initial angle of the bimetallic strip 3. By connecting the driving component 4 to the bimetallic strip 3, the overall length is increased, which can meet the connection distance requirements between the bimetallic strip 3 and the alarm tripping component 1 and the overload tripping component 2, respectively. As can be seen from the above, the two hooks on the driving component 4 adopt an L-shaped hook and a structural design with a difference in vertical section length and a difference in hook depth. In addition, the two hooks are staggered and act on two different positions of the alarm tripping component 1 and the overload tripping component 2. This structural design can clearly distinguish the action threshold of overload alarm and overload trip, strictly ensuring the timing sequence of "alarm first, then trip".

[0037] In this embodiment, combined with Figure 1 and Figure 4As shown, the alarm circuit structure includes two alarm terminals 8 disposed in the circuit breaker housing 9 and a spring member 7 for connecting or disconnecting the circuit between the two alarm terminals 8. The spring member 7 extends between the two alarm terminals 8 and includes a first elastic foot 71 that contacts one of the alarm terminals 8, and a first elastic foot 71 connected to the alarm tripping member 1. A first protrusion 11 is provided on one side of the alarm tripping member 1, and the first elastic foot 71 is hooked onto the first protrusion 11. After the alarm tripping member 1 is released from the constraint of the driving member 4, it will rotate under the elastic force of the spring member 7. The two alarm terminals can be connected to external alarm devices such as alarm lights or alarm lamps via wiring. In this structural configuration, when the oil-immersed circuit breaker is operating normally, the alarm tripping element 1 and the driving element 4 form a limiting engagement and compress the spring element 7, causing the spring element 7 to deform elastically under pressure and move away from the other alarm terminal 8, thereby disconnecting the circuit connection between the two alarm terminals 8, i.e., disconnecting the alarm circuit structure. However, when the circuit breaker experiences an overload or temperature rise, the bimetallic strip will drive the driving element 4 to separate from the alarm tripping element 1, causing the alarm tripping element 1 to rotate under the force of the spring element 7. The spring element 7 recovers its deformation when the driving element 4 and the alarm tripping element 1 separate, and after recovering its deformation, it connects the two alarm terminals 8, thereby connecting the alarm circuit structure to realize the overload alarm function. The advantage of this technical solution is that when the circuit breaker is overloaded, the alarm action is triggered by the cooperation between the alarm tripping component 1, the spring component 7 and the alarm terminal 8 to remind the user that a circuit overload fault has occurred. This allows the user to judge and choose whether to disconnect the circuit or to eliminate the circuit fault as soon as possible, thereby avoiding major losses caused by the sudden disconnection of the circuit. This realizes the overload alarm function of the oil-immersed circuit breaker.

[0038] In this embodiment, combined with Figure 1-3As shown, a second protrusion 22 is provided on one side of the overload tripping member 2. A tripping spring 6 connected to the second protrusion 22 is provided inside the circuit breaker housing 9. The function of the tripping spring 6 is to drive the overload tripping member 2 to rotate when the overload tripping member 2 is released from the limiting engagement with the driving member 4. The contact mechanism 5 includes a movable support 51 rotatably disposed inside the circuit breaker housing 9 and a movable contact 52 disposed on the movable support 51, as well as an operating component 55 that drives the movable support 51 and the movable contact 52 to perform opening and closing movements. A stationary contact 53 opposite to the movable contact 52 is provided inside the circuit breaker housing 9. A opening spring 54 is connected between the movable support 51 and the circuit breaker housing 9. A limiting plate 56 is rotatably disposed inside the circuit breaker housing 9, located on the movement path of the overload tripping member 2. The moving bracket 51 is engaged with the bottom groove of the limiting plate 56. After the overload tripping member 2 and the driving member 4 are released from the limiting engagement, the limiting plate 56 is pushed to separate from the moving bracket 51. Specifically, a second protrusion 22 is provided on one side of the overload tripping member 2. A tripping spring 6 connected to the second protrusion 22 is provided inside the circuit breaker housing 9. When the bimetallic strip bends and drives the driving member 4 to disengage from the overload tripping member 2, the overload tripping member 2 will rotate under the force of the tripping spring 6, thereby pushing the limiting plate 56 to move through the second protrusion 22. When the contact mechanism 5 drives the moving contact 52 to contact the stationary contact 53, it is in the closed state. At this time, the opening spring 54 is stretched and stored. Therefore, when the limit plate 56 is driven by the overload tripping component 2, it swings away from the moving bracket 51, causing the limit plate 56 to disengage from the moving bracket 51. At this time, the contact mechanism 5 will perform the tripping action under the spring force released by the opening spring 54, thereby realizing the separation of the moving and stationary contacts and realizing the overload tripping protection function of the oil-immersed circuit breaker. The operating component 55 includes a handle slider that is slidably disposed in the slide groove of the circuit breaker housing, and a transmission component connecting the handle slider and the moving bracket 51. When the circuit breaker is reclosed, the handle slider moves along the slide groove and pushes the overload tripping component and the alarm tripping component to reset and rotate, so that the overload tripping component and the alarm component are respectively re-limited and engaged with the two hooks of the driving component.

[0039] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A circuit breaker overload alarm tripping mechanism, comprising an overload tripping member (2) and an alarm tripping member (1) rotatably disposed on the circuit breaker housing (9), and a bimetallic strip (3) connected to the main circuit of the circuit breaker and a driving member (4) linked to one end of the bimetallic strip (3); characterized in that: The driving member (4) includes a first hook (41) extending and abutting against the alarm release member (1) and a second hook (42) extending and abutting against the overload release member. The driving member (4) forms a limiting engagement with the alarm release member (1) and the overload release member respectively through the first hook (41) and the second hook (42) to maintain relative positioning. The first hook (41) and the second hook (42) are staggered and arranged at one end of the driving member (4) away from the bimetallic strip (3). When the bimetallic strip (3) bends, it first causes the second hook (42) of the drive member (4) to separate from the alarm trip member (1), and then causes the second hook (42) to separate from the overload trip member. After the alarm trip member (1) is separated from the drive member (4), it rotates to trigger the connection of the alarm circuit structure. After the overload trip member (2) is separated from the drive member (4), it rotates to trigger the tripping action of the contact mechanism (5).

2. The circuit breaker overload alarm tripping mechanism according to claim 1, characterized in that: The alarm release component (1) is provided with a first release platform (11) that is connected to the first hook (41) to form a positioning engagement. When the first hook (41) engages with the first release platform (11), it restricts the rotation of the alarm release component (1).

3. The circuit breaker overload alarm tripping mechanism according to claim 2, characterized in that: The overload release member (2) is provided with a second release platform (21) that is connected to the second hook (42) to form a positioning engagement. When the second hook (42) engages with the second release platform (21), it restricts the rotation of the overload release member (2).

4. The circuit breaker overload alarm tripping mechanism according to claim 3, characterized in that: The first hook (41) and the second hook (42) are staggered L-shaped hooks, and the vertical length of the second hook (42) is greater than the vertical length of the first hook (41).

5. The circuit breaker overload alarm tripping mechanism according to claim 4, characterized in that: The latching distance between the first hook (41) and the first release table (11) is less than the fastening distance between the second hook (42) and the second release table (21).

6. The circuit breaker overload alarm tripping mechanism according to claim 5, characterized in that: The drive component (4) has a sheet-like structure and extends along the length of the bimetallic strip (3) and is fixed at one end of the bimetallic strip (3). The bimetallic strip (3) can be swung inside the circuit breaker housing (9) by means of the adjustment component (31).

7. The circuit breaker overload alarm tripping mechanism according to any one of claims 1-6, characterized in that: The contact mechanism (5) includes a movable bracket (51) rotatably disposed within the circuit breaker housing (9) and a movable contact (52) disposed on the movable bracket (51), and an operating component (55) that drives the movable bracket (51) and the movable contact (52) to perform opening and closing movements. A opening spring (54) is connected between the movable bracket (51) and the circuit breaker housing (9). A limiting plate (56) is rotatably disposed within the circuit breaker housing (9) on the movement path of the overload tripping member (2). The movable bracket (51) is engaged and locked in the bottom slot of the limiting plate (56). After the overload tripping member (2) and the driving member (4) release the limiting engagement, the limiting plate (56) is pushed to separate from the movable bracket (51).

8. The circuit breaker overload alarm tripping mechanism according to claim 7, characterized in that: The overload tripping member (2) has a second protrusion (22) on one side. The circuit breaker housing (9) is provided with a tripping spring (6) that connects to the second protrusion (22). Under the action of the tripping spring (6), the overload tripping member (2) pushes the limiting plate (56) to move through the second protrusion (22).

9. The circuit breaker overload alarm tripping mechanism according to any one of claims 1-6, characterized in that: The alarm circuit structure includes two alarm terminals (8) disposed on the circuit breaker housing (9) and a spring member (7) for connecting or disconnecting the circuit between the two alarm terminals (8). The spring member (7) includes a first elastic foot (71) connected to one of the alarm terminals (8) and a first elastic foot (71) connected to the alarm tripping member (1). When the driving member (4) is separated from the alarm tripping member (1), the spring member (7) drives the alarm tripping member (1) to rotate and connects the two alarm terminals (8) by the spring member (7).

10. The circuit breaker overload alarm tripping mechanism according to claim 9, characterized in that: The alarm release component (1) has a first protrusion (11) on one side, and the first elastic foot (71) is hooked onto the first protrusion (11).

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