A ground fault circuit interrupter trip mechanism

Abstract

The utility model discloses a leakage circuit breaker tripping mechanism, including the casing, the circuit board, the operating mechanism, the tripping device and the tripping mechanism, be provided with the trigger lever on the tripping mechanism, and the tripping device is linked with the trigger lever, and the tripping mechanism is linked with the operating mechanism, when the tripping device works, through the trigger lever can drive the tripping mechanism work promotes the operating mechanism work to realize power failure, the trigger lever is equipped with the connecting rod part who sets up along the vertical direction, still including having in the bimetallic element of casing, be equipped with the first extension on the bimetallic element and extend to the left side of connecting rod part, and the moving iron core of tripping device is connected with the connecting rod, be equipped with the second extension that extends to the left side of hooking in the connecting rod part on the connecting rod, and the first extension and the second extension are staggered along the vertical direction and set up, adopt bimetallic element to realize overload protection, and realize leakage protection through the tripping device, can reduce the demand to the iron core spring force, and the reaction speed is fast when the leakage, and the safety factor is higher.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a tripping mechanism for a residual current circuit breaker. Background Technology

[0002] The existing residual current tripping mechanism of circuit breakers includes a circuit breaker housing and a trip unit and linkage unit located inside the circuit breaker housing. The trip unit includes a coil, a coil frame, a magnetic yoke, and an iron core. The coil is wound on the coil frame, which is cylindrical. The magnetic yoke is U-shaped, with opposite sides of the magnetic yoke fitted onto the two ends of the coil frame. The iron core passes through the coil frame, and one end of the iron core has a push rod. The coil frame has an opening for the push rod to enter and exit. This type of tripping mechanism has a large coil frame, which is inconvenient to install in small (e.g., 18mm wide) residual current circuit breakers. Generally, a solution is to use a shared iron core for the voltage coil and the current coil. However, sharing an iron core will cause electromagnetic interference, and due to the instantaneous action characteristics, the spring force of the iron core needs to be increased, which may cause the voltage coil to fail to operate. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art and provide a tripping mechanism for a residual current circuit breaker. The tripping mechanism is triggered by two driving methods, uses a bimetallic element to achieve overload protection, and uses a trip unit to achieve leakage protection. This can reduce the demand on the iron core spring force, and the reaction speed is fast when leakage occurs, resulting in a higher safety factor.

[0004] This utility model discloses a tripping mechanism for a residual current circuit breaker, including a housing, a circuit board, an operating mechanism, a trip unit, and a tripping mechanism. The trip unit includes a coil frame, an electromagnetic coil wound on the coil frame, a moving iron core slidably disposed in the middle of the coil frame, and a magnetic spring that drives the moving iron core to extend. The tripping mechanism is provided with a trigger rod, and the trip unit and the trigger rod are linked together. The tripping mechanism and the operating mechanism are also linked together. When the trip unit is working, the trigger rod can drive the tripping mechanism to work, causing the operating mechanism to work and achieve power disconnection. The trigger rod is characterized by having a connecting rod portion arranged vertically, and also includes a bimetallic element disposed in the housing. The bimetallic element has a first extension portion extending to the left side of the connecting rod portion. The moving iron core of the trip unit is connected to a connecting rod, and the connecting rod has a second extension portion extending to the left side of the connecting rod portion. The first extension portion and the second extension portion are staggered in the vertical direction.

[0005] Using the above technical solution, the tripping mechanism is triggered by two driving methods. Overload protection is achieved by using bimetallic components, and leakage protection is achieved by using a trip unit. This reduces the demand on the iron core spring force, provides a fast response speed during short circuits, and has a higher safety factor. Furthermore, the staggered arrangement of the first extension and the second extension ensures that their individual triggering will not be interfered with, and the structure is relatively stable.

[0006] A further feature of this invention is that the tail of the connecting rod is connected to an extension plate, and a U-shaped groove is provided on the extension plate. The head of the moving iron core is arranged in an I-shape and is locked in the U-shaped groove, so that the moving iron core and the connecting rod extend or retract synchronously.

[0007] Using the above technical solution, the head of the moving iron core is set in an I-shape, so that it can enter the U-shaped groove and abut against the left and right sides of the extension plate, so that the moving iron core can pull the connecting rod to extend and retract. Further, the optimal option is to set a limiting plate on the left side of the moving iron core to prevent the moving iron core from extending too far.

[0008] A further feature of this invention is that the extension plate is made of a material that can be relatively deformed, and the inner walls on both sides of the U-shaped groove are provided with blocking blocks to prevent the iron core from coming out.

[0009] Using the above technical solution, the moving iron core will generate an impact force when it extends and retracts, making it easy to jump out of the U-shaped groove. By blocking the block, it can be prevented from jumping out. In addition, the extension plate can be deformed relatively, and it can be pressed into the U-shaped groove by external force. The structural layout is relatively simple, easy to assemble, and the effect is stable.

[0010] A further feature of this invention is that a guide groove is provided on the housing at the position of the connecting rod, and the connecting rod slides within the guide groove.

[0011] By adopting the above technical solution, the linkage can be prevented from deviating, making it more stable during sliding and further preventing it from interfering with the deformation of the bimetallic component.

[0012] A further feature of this invention is that the guide groove is located above the bimetallic element.

[0013] By adopting the above technical solution, the guide groove can be avoided from interfering with the deformation of the bimetallic component.

[0014] A further feature of this invention is that an inclined guide surface is provided at the opening of the U-shaped groove.

[0015] By adopting the above technical solution, the head of the moving iron core can be guided into the U-shaped groove.

[0016] A further feature of this invention is that the circuit board is provided with a plurality of first positioning holes, the trip unit is provided with a plurality of second positioning holes corresponding to the positions of the first positioning holes, and a locking member is provided between the first positioning holes and the second positioning holes.

[0017] By adopting the above technical solution, the stability of the trip unit installation is increased, preventing it from shaking relative to the circuit board. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the present invention when the circuit is closed; Figure 3 This is a schematic diagram of the internal structure of the present invention during tripping; Figure 4 This is a schematic diagram of part of the structure of this utility model; Figure 5 This is a schematic diagram of the circuit board structure of this utility model; Figure 6 This is a schematic diagram of the circuit board and trip unit structure of this utility model; Figure 7 This is a diagram showing the fit between the latch, the jumper, and the latch spring of this utility model. Figure 8 This is a schematic diagram of the tie rod structure of this utility model; Figure 9 This is a schematic diagram of the trip unit structure of this utility model; Figure 10 for Figure 3 Enlarged view of part a. Detailed Implementation

[0019] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings: In the description of this utility model, it should be understood that the terms "upper," "lower," "bottom," "top," "front," "rear," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model. The most preferred release mechanism can be a latch, a jump latch, and a latch spring that drives the latch and the jump latch to abut against each other, all rotatably mounted on the housing. The jump latch and the operating mechanism can be linked by a linkage. Moreover, the operating mechanism and the release mechanism are prior art and are not the main inventive points of this application. They will not be described in detail here. For details, please refer to the Chinese patent application with application number 202310310248.7 (the vertical direction in this document is the direction of arrow a in the accompanying drawings).

[0020] This utility model discloses a tripping mechanism for a residual current circuit breaker (RCCB), comprising a housing 1, a circuit board 2, an operating mechanism 3, a trip unit 4, and a tripping mechanism 5. The tripping mechanism 5 is equipped with a trigger rod 6. The trip unit 4 includes a coil frame 41, an electromagnetic coil 42 wound on the coil frame 41, a moving iron core 43 slidably disposed in the middle of the coil frame 41, and a magnetic spring 44 for driving the moving iron core 43 to extend. The trip unit 4 and the trigger rod 6 are linked, and the tripping mechanism 5 and the operating mechanism 3 are linked. When the trip unit 4 operates, the trigger rod 6 drives the tripping mechanism 5 to operate, causing the operating mechanism 3 to trip, thus separating the moving contact from the stationary contact and achieving power disconnection. In this embodiment of the utility model, the trigger rod 6 is arranged vertically. The connecting rod portion 61 also includes a bimetallic element 7 disposed within the housing 1. The bimetallic element 7 has a first extension portion 71 extending to the left side of the connecting rod portion 61. A connecting rod 8 is connected to the moving iron core 43 of the trip unit 4. The connecting rod 8 has a second extension portion 81 extending to the left side of the connecting rod portion 61. The first extension portion 71 and the second extension portion 81 are staggered in the vertical direction. The trip mechanism is triggered by two driving methods. Overload protection is achieved by using the bimetallic element 7, and leakage protection is achieved by using the trip unit 4. This reduces the demand on the iron core spring force, provides a fast response speed during short circuits, and has a higher safety factor. Furthermore, the staggered arrangement of the first extension portion 71 and the second extension portion 81 ensures that their individual triggering will not be interfered with, and the structure is relatively stable.

[0021] The tail of the connecting rod 8 is connected to an extension plate 82, and a U-shaped groove 821 is provided on the extension plate 82. The head of the moving iron core 43 is I-shaped and is locked in the U-shaped groove 821 so that the moving iron core 43 extends or retracts synchronously with the connecting rod 8. The I-shaped head of the moving iron core 43 allows it to enter the U-shaped groove 821 and abut against the left and right sides of the extension plate 82, so that the moving iron core 43 can pull the connecting rod 8 to extend or retract. Further, the most preferred option is to provide a limiting plate on the left side of the moving iron core 43 to prevent the moving iron core 43 from extending excessively.

[0022] The extension plate 82 is made of a relatively deformable material. The inner walls on both sides of the U-shaped groove 821 are provided with blocking blocks 822 to prevent the iron core 43 from falling out. When the moving iron core 43 extends or retracts, it will generate an impact force and is easy to jump out of the U-shaped groove 821. By blocking it with the blocking blocks 822, it can be prevented from jumping out. In addition, the extension plate 82 is relatively deformable and can be pressed into the U-shaped groove 821 by external force. The structural layout is relatively simple, easy to assemble, and the effect is stable.

[0023] The housing 1 has a guide groove 9 arranged laterally at the position of the connecting rod 8. The connecting rod 8 slides within the guide groove 9, which can prevent the connecting rod 8 from deviating and make it more stable when sliding, and further prevent it from interfering with the deformation of the bimetallic element 7.

[0024] The guide groove 9 is located above the bimetallic element 7 to prevent the guide groove 9 from interfering with the deformation of the bimetallic element 7.

[0025] An inclined guide surface 823 is provided at the opening of the U-shaped groove 821, which can guide the head of the moving iron core 43 to be inserted into the U-shaped groove 821.

[0026] The circuit board 2 is provided with a plurality of first positioning holes 21, and the trip unit 4 is provided with a plurality of second positioning holes 411 corresponding to the positions of the first positioning holes 21. A locking element (preferably a screw or pin not shown in the figure) is provided between the first positioning holes 21 and the second positioning holes 411 to increase the stability of the trip unit 4 during installation and prevent it from shaking relative to the circuit board 2.

Claims

1. A tripping mechanism for a residual current circuit breaker, comprising a housing (1), a circuit board (2), an operating mechanism (3), a trip unit (4), and a tripping mechanism (5), wherein the trip unit (4) comprises a coil frame (41), an electromagnetic coil (42) wound on the coil frame (41), a movable iron core (43) slidably disposed in the middle of the coil frame (41), and a magnetic spring (44) for driving the movable iron core (43) to extend; the tripping mechanism (5) is provided with a trigger rod (6), the trip unit (4) and the trigger rod (6) are linked and cooperate, and the tripping mechanism (5) and the operating mechanism (3) are linked and cooperate. When the trip unit (4) is working, the trigger rod (6) can drive the tripping mechanism (5) to work, causing the operating mechanism (3) to trip and achieve power disconnection, characterized in that: The trigger rod (6) is provided with a connecting rod portion (61) arranged in the vertical direction, and also includes a bimetallic element (7) provided in the housing (1). The bimetallic element (7) is provided with a first extension portion (71) extending to the left side of the connecting rod portion (61). The moving iron core (43) of the trip unit (4) is connected to a connecting rod (8). The connecting rod (8) is provided with a second extension portion (81) extending to the left side of the connecting rod portion (61). The first extension portion (71) and the second extension portion (81) are staggered in the vertical direction.

2. The tripping mechanism of a residual current circuit breaker according to claim 1, characterized in that: The tail of the connecting rod (8) is connected to an extension plate (82), and a U-shaped groove (821) is provided on the extension plate (82). The head of the moving iron core (43) is set in an I-shape and is locked in the U-shaped groove (821) so that the moving iron core (43) and the connecting rod (8) extend or retract synchronously.

3. The tripping mechanism of a residual current circuit breaker according to claim 2, characterized in that: The extension plate (82) is made of a material that can be relatively deformed, and the inner walls on both sides of the U-shaped groove (821) are provided with blocking blocks (822) for the limited braking iron core (43) to come out.

4. A residual current circuit breaker tripping mechanism according to claim 1, 2, or 3, characterized in that: The housing (1) has a guide groove (9) arranged in a transverse direction at the position of the connecting rod (8), and the connecting rod (8) slides within the guide groove (9).

5. The tripping mechanism of a residual current circuit breaker according to claim 3, characterized in that: The guide groove (9) is located above the bimetallic element (7).

6. A residual current circuit breaker tripping mechanism according to claim 2 or 3, characterized in that: An inclined guide surface (823) is provided at the opening of the U-shaped groove (821).

7. A residual current circuit breaker tripping mechanism according to claim 1, 2, or 3, characterized in that: The circuit board (2) is provided with a plurality of first positioning holes (21), and the trip unit (4) is provided with a plurality of second positioning holes (411) corresponding to the positions of the first positioning holes (21). A locking member is provided between the first positioning holes (21) and the second positioning holes (411).

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