A magnetic trip unit for a circuit breaker

Abstract

The utility model discloses a magnetic tripping device for circuit breaker relates to circuit breaker technical field, specifically is a kind of magnetic tripping device for circuit breaker, including bottom plate, L-shaped plate, electromagnetic component and strike component, the L-shaped plate is fixedly installed on bottom plate;The utility model is through optimizing structure design, electromagnetic component and strike component are respectively arranged at the both sides of L-shaped plate, and this layout makes the structure of whole device more compact, reduces the mutual interference between spare parts, improves the reliability of device.Compared with prior art, the tripping drive mechanism of the utility model is simpler, reduces complex mechanical connection, reduces the risk of device failure due to damage of spare parts.At the same time, by adopting reasonable fixing mode, the stability of electromagnetic component is ensured, and the loosening problem caused by external impact or vibration is avoided, thereby the overall performance and service life of circuit breaker are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a magnetic tripping device for circuit breakers. Background Technology

[0002] In existing circuit breaker technologies, the magnetic tripping device is a key component, and its performance and structural design significantly impact the overall function and reliability of the circuit breaker. Existing technologies, such as the rear-hook type magnetic amplification tripping device for circuit breakers disclosed in Chinese Patent CN204809173U, employ a combination of components including a base, electromagnetic mechanism, locking lever, and tripping hook. The electromagnetic mechanism is energized to actuate the locking lever, thereby breaking the circuit. While this design achieves the circuit-breaking function to a certain extent, some problems still exist in practical applications.

[0003] First, most existing magnetic tripping devices employ a side-impact tripping method, resulting in a complex tripping transmission mechanism typically made of engineering plastics. This not only increases manufacturing difficulty but also makes components prone to damage, affecting the circuit breaker's lifespan and reliability. Second, the assembly and disassembly of existing devices are cumbersome, requiring individual operation of each component. This increases maintenance costs and reduces work efficiency. Furthermore, existing devices are inadequate in securing and protecting electromagnetic components, making them susceptible to loosening due to external impacts or vibrations, thus affecting their normal operation.

[0004] In view of the problems existing in the prior art, this utility model proposes an improved magnetic tripping device for circuit breakers, which aims to solve the problems existing in the prior art by optimizing the structural design, thereby improving the overall performance and reliability of the circuit breaker. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a magnetic tripping device for circuit breakers, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a magnetic tripping device for a circuit breaker, comprising a base plate, an L-shaped plate, an electromagnetic component, and an impact component. The L-shaped plate is fixedly mounted on the base plate, and the electromagnetic component and the impact component are located on opposite sides of the L-shaped plate. The impact component includes a locking lever, a shaft, a traction rod, and a tripping spring. The traction rod is laterally slidably mounted on one side wall of the L-shaped plate. The lower end of the shaft is fixedly connected to the base plate. The locking lever is sleeved on the outer side wall of the shaft, and the two are rotatably connected. One end of the locking lever is engaged with the traction rod. One end of the tripping spring is fixedly connected to the traction rod, and the tripping spring elastically pushes the traction rod to move laterally.

[0007] Optionally, the electromagnetic component includes a first support plate, a second support plate, a coil frame, and a moving iron core. The first support plate and the second support plate are both horizontally arranged and fixedly installed on the base plate, and the two ends of the coil frame are respectively fixedly installed to the first support plate and the second support plate.

[0008] Optionally, a coil is wound and installed on the outer wall of the coil frame, and the moving iron core is inserted into the coil frame, with the moving iron core slidably installed with the coil frame.

[0009] Optionally, a retaining ring is fixedly installed at the exposed end of the moving iron core.

[0010] Optionally, the striking component further includes a support column, the lower end of which is fixedly connected to the base plate, the support column corresponding to the traction rod, and the end of the release spring away from the traction rod being fixedly connected to the support column.

[0011] Optionally, the striking component further includes a first spring, which is sleeved on the outer wall of the shaft, located above the locking lever, with one end of the first spring fixedly connected to the support column and the other end of the first spring fixedly connected to the locking lever.

[0012] Optionally, the traction rod is composed of a first triggering part, a second triggering part, and a connecting part. The first triggering part and the second triggering part are C-shaped as a whole, and a slot is provided on the side wall of the connecting part.

[0013] Optionally, the locking lever is composed of a rod body and a locking part, with the rod body perpendicular to the locking part. When the locking part is rotated, its end engages or disengages with the slot of the connecting part.

[0014] Optionally, the L-shaped plate has a through hole, and the end of the rod body away from the locking part passes through the through hole, so that the moving iron core collides with the rod body when it slides.

[0015] Optionally, a cover plate is detachably installed on the base plate, and the cover plate covers the electromagnetic components.

[0016] This utility model provides a magnetic tripping device for circuit breakers, which has the following advantages: 1. This utility model, through optimized structural design, places the electromagnetic component and the striking component on opposite sides of the L-shaped plate. This layout makes the entire device more compact, reduces mutual interference between components, and improves the device's reliability. Compared with existing technologies, the tripping transmission mechanism of this utility model is simpler, reduces complex mechanical connections, and lowers the risk of device failure due to component damage. Simultaneously, by employing a reasonable fixing method, the stability of the electromagnetic component is ensured, avoiding loosening problems caused by external impacts or vibrations, thereby significantly improving the overall performance and service life of the circuit breaker.

[0017] 2. The magnetic release device of this utility model is designed with ease of assembly and disassembly in mind. Through a reasonable layout and connection method of components, the entire device can be quickly assembled and disassembled. For example, the lateral sliding installation of the traction rod and the rotating connection between the locking lever and the shaft allow for rapid installation and disassembly of components, significantly reducing maintenance time and costs. Furthermore, this utility model further facilitates the maintenance and repair of the electromagnetic components by incorporating a removable cover plate, thus improving work efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the circuit breaker body; Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a three-dimensional structural diagram of the present invention; Figure 4 This is a three-dimensional structural diagram of the traction rod in this utility model; Figure 5 This is a three-dimensional structural diagram of the L-shaped plate in this utility model; Figure 6 This is a three-dimensional structural diagram of the locking lever in this utility model.

[0020] In the diagram: 1. Base plate; 2. First support plate; 3. Traction rod; 301. First actuating part; 302. Second actuating part; 303. Connecting part; 4. Coil frame; 5. Coil; 6. Second support plate; 7. Retaining ring; 8. L-shaped plate; 9. Through hole; 10. Locking lever; 1001. Rod body; 1002. Locking part; 11. First spring; 12. Shaft; 13. Support column; 14. Tripping spring; 15. Moving iron core; 16. Circuit breaker body; 17. Cover plate. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying anything.

[0022] 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. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0023] Please see Figures 1 to 6 This utility model provides a technical solution: a magnetic tripping device for a circuit breaker is installed inside the circuit breaker body 16. The magnetic tripping device for a circuit breaker includes a base plate 1, an L-shaped plate 8, an electromagnetic component, and an impact component. The base plate 1 is fixedly installed on the circuit breaker body 16.

[0024] L-shaped plate 8 is fixedly mounted on base plate 1, with the electromagnetic component and striking component located on opposite sides of L-shaped plate 8. The striking component includes a locking lever 10, a shaft 12, a traction rod 3, and a trip spring 14. The traction rod 3 is laterally slidably mounted on one side wall of L-shaped plate 8. The lower end of shaft 12 is fixedly connected to base plate 1. The locking lever 10 is sleeved on the outer side wall of shaft 12, and the two are rotatably connected. One end of the locking lever 10 is engaged with the traction rod 3. The traction rod 3 is connected to the internal actuating mechanism of circuit breaker body 16. One end of the trip spring 14 is fixedly connected to the traction rod 3, and the trip spring 14 elastically pushes the traction rod 3 to move laterally.

[0025] The base plate 1, serving as the core load-bearing structure of the device, is rigidly fixed to the circuit breaker body 16, providing a stable installation benchmark and structural support for the entire system. The L-shaped plate 8 is bolted to the base plate 1, and its 90° bend structure forms a functional partition barrier, separating the electromagnetic components and the impact components on opposite sides, achieving physical isolation between electromagnetic interference and mechanical transmission, and ensuring the stability of system operation.

[0026] In the striking component, the shaft 12 is vertically fixed to the base plate 1, providing high-precision rotational support for the locking lever 10; the locking lever 10 is fitted with the shaft 12 and forms a rotational fit, achieving precise positioning of the traction rod 3 through an end-clamping structure. The traction rod 3 is laterally slidably constrained by the guide groove of the L-shaped plate 8, and one end is linked to the internal action mechanism of the circuit breaker body 16, forming the core of force transmission; the trip spring 14 is rigidly fixed to the traction rod 3, pre-stored elastic potential energy to form a stable lateral driving force, providing an efficient power source for the tripping action and ensuring rapid response in case of fault.

[0027] Specifically, the electromagnetic components include a first support plate 2, a second support plate 6, a coil frame 4, and a moving iron core 15. The first support plate 2 and the second support plate 6 are both horizontally arranged and fixedly installed on the base plate 1. The two ends of the coil frame 4 are fixedly installed to the first support plate 2 and the second support plate 6, respectively.

[0028] The electromagnetic component, serving as the core power source of the device, comprises a first support plate 2, a second support plate 6, a coil frame 4, and a moving iron core 15. The base plate 1 acts as a rigid load-bearing substrate, upon which the first and second support plates 2 and 6 are fixed in a horizontal array, forming a high-precision support frame that ensures precise matching of the spacing between them to the dimensions of the coil frame 4. The coil frame 4 is rigidly fixed at both ends to the two support plates, forming a stable axial positioning reference and providing a reliable carrier for coil winding and magnetic field generation. This structure allows the magnetic field generated by the coil after energization to act uniformly on the built-in moving iron core 15, which can smoothly slide along the frame axis, efficiently converting electromagnetic energy into mechanical driving force. This provides a stable power source for subsequent tripping actions, ensuring triggering accuracy.

[0029] More specifically, a coil 5 is wound and installed on the outer wall of the coil frame 4, and a moving iron core 15 is inserted into the coil frame 4, with the moving iron core 15 slidably installed with the coil frame 4. A retaining ring 7 is fixedly installed on the exposed end of the moving iron core 15.

[0030] The coil frame 4 serves as the core supporting structure, with the coil 5 assembled on its outer wall using precision winding technology to construct a high-efficiency magnetic field generating module. When the coil 5 is energized, it generates a directional magnetic field. The built-in moving iron core 15, with its high magnetic permeability, forms a low-friction sliding pair with the coil frame 4, sliding precisely along the frame axis under the action of the magnetic field force, achieving efficient conversion of electromagnetic energy into mechanical kinetic energy. A retaining ring 7 fixed to the exposed end of the moving iron core 15 constitutes an axial limiting barrier, precisely constraining the stroke of the moving iron core 15, preventing excessive sliding that could cause structural damage, and ensuring the reliability of the system operation.

[0031] Specifically, the striking component also includes a support column 13, the lower end of which is fixedly connected to the base plate 1. The support column 13 corresponds to the traction rod 3, and the end of the release spring 14 away from the traction rod 3 is fixedly connected to the support column 13.

[0032] The support column 13 serves as the rigid load-bearing fulcrum for the striking component, with its lower end rigidly connected to the base plate 1, forming a stable force support structure. It is arranged correspondingly to the traction rod 3, providing a precise installation reference for the trip spring 14. The trip spring 14 is fixed at both ends, connecting the traction rod 3 and the support column 13 respectively, and is pre-compressed during assembly to store elastic potential energy. This design establishes an efficient force transmission path. When the latch is released, the spring releases energy to push the traction rod 3 to slide laterally, providing a stable and controllable driving force for the circuit breaker tripping, ensuring precise operation.

[0033] More specifically, the striking component also includes a first spring 11, which is sleeved on the outer wall of the shaft 12. The first spring 11 is located above the locking lever 10. One end of the first spring 11 is fixedly connected to the support column 13, and the other end of the first spring 11 is fixedly connected to the locking lever 10.

[0034] The first spring 11 is the core reset component of the striking mechanism. It is coaxially mounted on the outer wall of the shaft 12 and precisely positioned above the locking lever 10, forming a stable force constraint system. Its two ends are rigidly connected to the support column 13 and the locking lever 10, respectively. In its natural state, it is slightly pre-tightened, providing a continuous reset torque for the locking lever 10. This design ensures that the locking lever 10 always maintains a reliable engagement with the traction rod 3, and after unlocking, it quickly drives the locking lever 10 back to its original position, establishing an efficient and stable mechanical reset mechanism and ensuring the cyclic working accuracy of the tripping system.

[0035] More specifically, the traction rod 3 is composed of a first actuating part 301, a second actuating part 302, and a connecting part 303. The first actuating part 301 and the second actuating part 302 are C-shaped as a whole, and a slot is provided on the side wall of the connecting part 303. The locking lever 10 is composed of a rod body 1001 and a locking part 1002. The rod body 1001 and the locking part 1002 are perpendicular. When the locking part 1002 is rotated, its end engages or disengages with the slot of the connecting part 303. A through hole 9 is provided on the L-shaped plate 8. The end of the rod body 1001 away from the locking part 1002 passes through the through hole 9, and collides with the rod body 1001 when the moving iron core 15 slides.

[0036] The traction rod 3 adopts an integrated configuration, consisting of a first actuating part 301, a second actuating part 302, and a connecting part 303. The two actuating parts are arranged in a C-shape to form a multi-point contact force transmission interface, ensuring the stability of the linkage with the circuit breaker body 16 mechanism; the slot opened on the side wall of the connecting part 303 establishes a precise locking reference. The locking lever 10 has a vertically orthogonal configuration with a rod body 1001 and a locking part 1002. The rod body 1001 is positioned by passing through the through hole 9 of the L-shaped plate 8. When it is rotated under force, it drives the locking part 1002 to lock or unlock with the slot. When the moving iron core 15 slides, it impacts the rod body 1001, triggering the locking action, thus establishing an efficient and precise mechanical triggering link.

[0037] Specifically, a cover plate 17 is detachably installed on the base plate 1, and the cover plate 17 covers the electromagnetic components.

[0038] The cover plate 17 is assembled on the electromagnetic components with a detachable structure, precisely covering them to form a sealed protective barrier. This design can isolate interference such as dust and moisture, ensuring the stable operation of core components such as coil 5 and moving iron core 15, while also facilitating later inspection and maintenance, thus creating a reliable operating environment for the electromagnetic system.

[0039] In use, in the initial state, the coil 5 is de-energized and the moving iron core 15 is in the initial position inside the coil frame 4; the pre-tightening force of the first spring 11 causes the locking part 1002 of the locking lever 10 to engage with the slot of the connecting part 303 of the traction rod 3, the traction rod 3 is positioned, and the release spring 14 is in a pre-compressed state to store potential energy.

[0040] In the event of a malfunction, the coil 5 is energized, generating a magnetic field that drives the moving iron core 15 to slide along the coil frame 4. Its exposed end strikes the rod portion 1001 of the locking lever 10. The rod portion 1001 rotates around the shaft 12, causing the locking portion 1002 to disengage from the slot and release the constraint on the traction rod 3.

[0041] The trip spring 14 releases potential energy, pushing the traction rod 3 to slide along the guide groove of the L-shaped plate 8. Its C-shaped first and second triggering parts are linked to the internal mechanism of the circuit breaker body 16 to achieve tripping and disconnection.

[0042] After the fault is cleared, the external force resets the traction rod 3, the first spring 11 drives the locking lever 10 to return to its original position, the locking part 1002 re-engages into the slot, and the device returns to its initial state.

[0043] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A magnetic tripping device for a circuit breaker, characterized in that: Includes base plate (1), L-shaped plate (8), electromagnetic components and striking components, The L-shaped plate (8) is fixedly installed on the base plate (1), and the electromagnetic component and the striking component are located on both sides of the L-shaped plate (8); The striking component includes a locking lever (10), a shaft (12), a traction rod (3), and a release spring (14). The traction rod (3) is laterally slidably installed on one side wall of the L-shaped plate (8). The lower end of the shaft (12) is fixedly connected to the base plate (1). The locking lever (10) is sleeved on the outer side wall of the shaft (12) and the two are rotatably connected. One end of the locking lever (10) is engaged with the traction rod (3). One end of the release spring (14) is fixedly connected to the traction rod (3), and the release spring (14) elastically pushes the traction rod (3) to move laterally.

2. The magnetic tripping device for a circuit breaker according to claim 1, characterized in that: The electromagnetic components include a first support plate (2), a second support plate (6), a coil frame (4), and a moving iron core (15). The first support plate (2) and the second support plate (6) are both arranged horizontally and fixedly installed on the base plate (1). The two ends of the coil frame (4) are fixedly installed to the first support plate (2) and the second support plate (6) respectively.

3. A magnetic tripping device for a circuit breaker according to claim 2, characterized in that: A coil (5) is wound and installed on the outer wall of the coil frame (4), and the moving iron core (15) is inserted inside the coil frame (4). The moving iron core (15) and the coil frame (4) are slidably installed.

4. A magnetic tripping device for a circuit breaker according to claim 2, characterized in that: A retaining ring (7) is fixedly installed on the exposed end of the moving iron core (15).

5. A magnetic tripping device for a circuit breaker according to claim 1, characterized in that: The striking component also includes a support column (13), the lower end of which is fixedly connected to the base plate (1), the support column (13) is corresponding to the traction rod (3), and the end of the release spring (14) away from the traction rod (3) is fixedly connected to the support column (13).

6. A magnetic tripping device for a circuit breaker according to claim 5, characterized in that: The striking component also includes a first spring (11), which is sleeved on the outer wall of the shaft (12). The first spring (11) is located above the locking lever (10). One end of the first spring (11) is fixedly connected to the support column (13), and the other end of the first spring (11) is fixedly connected to the locking lever (10).

7. A magnetic tripping device for a circuit breaker according to claim 2, characterized in that: The traction rod (3) is composed of a first trigger part (301), a second trigger part (302), and a connecting part (303). The first trigger part (301) and the second trigger part (302) are C-shaped as a whole, and a slot is provided on the side wall of the connecting part (303).

8. A magnetic tripping device for a circuit breaker according to claim 7, characterized in that: The locking lever (10) is composed of a rod body (1001) and a locking part (1002). The rod body (1001) and the locking part (1002) are perpendicular. When the locking part (1002) is rotated, its end engages or disengages with the slot of the connecting part (303).

9. A magnetic tripping device for a circuit breaker according to claim 8, characterized in that: The L-shaped plate (8) has a through hole (9), and the end of the rod body (1001) away from the latch (1002) passes through the through hole (9). When the moving iron core (15) slides, it collides with the rod body (1001).

10. A magnetic tripping device for a circuit breaker according to claim 1, characterized in that: A cover plate (17) is detachably installed on the base plate (1), and the cover plate (17) covers the electromagnetic components.

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