An opening and closing drive mechanism of a circuit breaker

Abstract

The utility model belongs to electrical equipment technical field, especially open and close gate drive mechanism of circuit breaker, including frame, still include: electromagnetic drive part, including fixed in the coil seat of frame and the movable iron core of being provided with on the coil seat of axial movement, lever transmission part, including the rotation axis of being connected in the frame rotation, fixed in the rotation axis on the tripping swing arm, and the reset torsional spring of being set in the rotation axis, wherein, reset torsional spring one end is connected in fixed part, the other end is used to tripping swing arm, to provide reset torque for its to closing position, movable iron core is used for pressing the stressed end of tripping swing arm, and drives its to overcome the torque rotation of reset torsional spring, makes tripping swing arm's effect end to produce displacement. The utility model discloses through above-mentioned design content, can improve the open and close gate reset reliability of circuit breaker.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, and specifically refers to a circuit breaker opening and closing drive mechanism. Background Technology

[0002] Circuit breakers are indispensable protective devices in power systems and electrical equipment. They are mainly used to automatically disconnect the circuit when overload, short circuit or other faults occur, so as to prevent electrical equipment and lines from being damaged by overcurrent. At the same time, the circuit can also be connected and disconnected manually to ensure the safe and stable operation of the circuit system.

[0003] In the existing technology, the reset structure of the opening and closing drive mechanism of some circuit breakers is complex, and it often relies on multiple springs or connecting rods to achieve reset. This is prone to unreliable reset due to wear of parts or misalignment, which affects the normal closing of the circuit breaker. At the same time, the drive mechanism lacks precise limit and guidance during transmission, which makes the action angle of the tripping swing arm unstable, resulting in poor consistency of opening and closing actions and affecting the reliability of the circuit breaker's on / off control. Therefore, there is an urgent need for a circuit breaker opening and closing drive mechanism with reliable reset and precise action. Utility Model Content

[0004] This invention uses a moving iron core to drive the tripping swing arm to rotate, and a reset torsion spring to provide a reset torque, thereby achieving reliable driving and reset of the circuit breaker's opening and closing, and solving the problems mentioned in the background art.

[0005] The purpose of this utility model is achieved as follows: a circuit breaker opening and closing drive mechanism, including a frame, and further comprising: The electromagnetic drive unit includes a coil base fixed to the frame and a moving iron core axially movable on the coil base; The lever transmission unit includes a rotating shaft rotatably connected to the frame, a release swing arm fixed to the rotating shaft, and a reset torsion spring sleeved on the rotating shaft. One end of the reset torsion spring is connected to the fixed part, and the other end acts on the tripping swing arm to provide it with a reset torque that tends to the closing position. The moving iron core is used to press against the force-bearing end of the tripping swing arm and drive it to rotate against the torque of the reset torsion spring, so that the working end of the tripping swing arm is displaced.

[0006] The present invention is further configured such that the fixing part is the coil seat or the frame.

[0007] The present invention is further configured such that the force-bearing end of the tripping swing arm is provided with a limiting structure for limiting the initial angle of the tripping swing arm when it is in the closed position.

[0008] The present invention is further configured such that the limiting structure is a limiting pin fixed on the frame, and the force-bearing end of the tripping swing arm abuts against the limiting pin when the circuit is closed.

[0009] The present invention is further configured such that a status indicator component is provided on the displacement path of the action end of the tripping swing arm, and the displacement of the action end is used to trigger the status switching of the status indicator component.

[0010] The present invention is further configured such that the status indicator component includes a button spring, and when the circuit is closed, the actuating end of the tripping swing arm remains in contact with the button spring.

[0011] The present invention is further configured such that the working end of the tripping swing arm is provided with a button wheel, and the button wheel is in contact with the button compression spring.

[0012] By adopting the above technical solution, the beneficial effects that this utility model can achieve are: 1. By using a reset torsion spring sleeved on the rotating shaft with one end acting on the tripping swing arm, a reset torque is directly provided to move the circuit towards the closing position, simplifying the reset structure, reducing the impact of matching errors, and improving reset reliability.

[0013] 2. By setting a limit structure at the force-bearing end of the tripping swing arm, the initial angle of the tripping swing arm in the closed position is limited, ensuring the stability of the tripping swing arm's operating angle and improving the consistency of the opening and closing actions.

[0014] 3. By linking the action end of the tripping swing arm with the status indicator component, its displacement directly triggers the switching of the status indicator component, so that the status feedback and the driving action are closely coordinated, thus improving the accuracy of the status indication. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a utility model Figure 1 Enlarged structural diagram of section A in the first direction; Figure 3 This is a utility model Figure 1 A magnified structural diagram in the second direction.

[0016] The reference numerals in the figure are as follows: 1. Frame; 2. Electromagnetic drive unit; 20. Coil holder; 21. Moving iron core; 3. Lever transmission unit; 30. Rotating shaft; 31. Tripping swing arm; 310. Force-receiving end; 311. Actuating end; 32. Reset torsion spring; 4. Fixing part; 5. Limiting structure; 50. Limiting pin; 6. Status indicator assembly; 60. Button compression spring; 61. Button wheel. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 : Example 1:

[0018] This embodiment provides a circuit breaker opening and closing drive mechanism, including a frame 1, and further including: The electromagnetic drive unit 2 includes a coil seat 20 fixed to the frame 1 and a moving iron core 21 axially movable on the coil seat 20; The lever transmission unit 3 includes a rotating shaft 30 rotatably connected to the frame 1, a release swing arm 31 fixed to the rotating shaft 30, and a reset torsion spring 32 sleeved on the rotating shaft 30. One end of the reset torsion spring 32 is connected to the fixed part 4, and the other end acts on the tripping swing arm 31 to provide it with a reset torque that tends to close the circuit. The moving iron core 21 is used to press against the force-bearing end 310 of the tripping swing arm 31 and drive it to rotate against the torque of the reset torsion spring 32, so that the action end 311 of the tripping swing arm 31 is displaced.

[0019] The opening and closing drive mechanism is used to control the circuit breaker to connect or disconnect the circuit, providing power and transmitting torque for the closing and opening actions of the circuit breaker to ensure that the circuit breaker can achieve circuit connection and disconnection as required. Its structure consists of a frame 1, an electromagnetic drive part 2, and a lever transmission part 3. The components are assembled to form a complete transmission system, and the power is transmitted through the cooperation of electromagnetic drive and lever transmission.

[0020] Frame 1 provides an installation reference and fixing carrier for other components to ensure the relative position stability of each component and ensure smooth transmission. It has multiple mounting positions to adapt to the internal space of the circuit breaker and the assembly requirements of each component. It can be connected to the circuit breaker body by bolts, and each functional component is installed on it in a corresponding manner.

[0021] The electromagnetic drive unit 2 converts electrical energy into mechanical power to provide driving force for the rotation of the tripping swing arm 31. Its structure consists of a coil seat 20 and a moving iron core 21. The moving iron core 21 is axially movable and mounted on the coil seat 20, generating driving force through electromagnetic induction. The coil seat 20 is used to accommodate the coil and provide guidance for the moving iron core 21, ensuring stable electromagnetic induction and smooth movement of the moving iron core 21. Its structure is a seat structure with an axial through hole for the moving iron core 21 to pass through. Its shape is adapted to the coil installation and the guiding requirements of the moving iron core 21, and it is fixed to the frame 1 by bolts. The moving iron core 21 is used to generate axial movement under the action of electromagnetic force to press against the tripping swing arm 31 and drive its rotation. Its structure is a columnar structure, and its shape is adapted to the axial through hole of the coil seat 20. Under the action of electromagnetic force, it can move relative to the axial through hole of the coil seat 20. One end faces the force-bearing end 310 of the tripping swing arm 31. Axial displacement is achieved and the force is transmitted through electromagnetic force.

[0022] The lever transmission unit 3 is used to convert the axial force of the moving iron core 21 into rotational torque and transmit it to drive the circuit breaker to perform opening and closing actions. Its structure consists of a rotating shaft 30, a tripping swing arm 31, and a return torsion spring 32, all assembled on the frame 1 and cooperating with the electromagnetic drive unit 2. The rotating shaft 30 provides a rotation fulcrum for the tripping swing arm 31, ensuring stable rotation of the tripping swing arm 31. Its structure is a cylindrical shaft, its shape adapted to the assembly requirements of the tripping swing arm 31 and the return torsion spring 32. It is rotatably connected to the frame 1 via bearings, and both the tripping swing arm 31 and the return torsion spring 32 are assembled on it. The tripping swing arm 31 receives the force from the moving iron core 21 and rotates around the rotating shaft 30, driving the circuit breaker to perform opening and closing actions through displacement at one end. Its structure is a swing arm-shaped structure with a force-receiving end 310 and an action end 311, its shape adapted to force transmission and installation. To meet space requirements, the middle part is fixedly connected to the rotating shaft 30 by bolts and can rotate synchronously with the rotating shaft 30. The force-bearing end 310 corresponds to the moving iron core 21, and the action end 311 corresponds to the circuit breaker actuator. The reset torsion spring 32 is used to provide a reset torque to drive the tripping arm 31 back to the initial closing position. Its structure is a spiral elastic component, and its shape is adapted to the assembly requirements of the rotating shaft 30. It is sleeved on the rotating shaft 30, and its two ends are respectively engaged with the fixing part 4 and the tripping arm 31. The end engaged with the tripping arm 31 can rotate with the rotation of the force-bearing end 310. After rotating away from the closing position, it generates a preload force to reset to the closing position through its own elastic deformation, so as to drive the lever transmission part 3 to reset when the closing signal is received. The fixing part 4 provides a fixed end point for the reset torsion spring 32 to ensure that the reset torsion spring 32 can generate a stable reset torque.

[0023] According to the above design, when the circuit breaker needs to trip, the coil in the coil base 20 is energized to generate electromagnetic force, which drives the moving iron core 21 to move axially along the coil base 20. After the moving iron core 21 moves, it presses against the force-bearing end 310 of the tripping swing arm 31, applying an axial force. Under the action of this force, the tripping swing arm 31 overcomes the reset torque of the reset torsion spring 32 and rotates around the rotation shaft 30. During the rotation of the tripping swing arm 31, its working end 311 generates a corresponding displacement, which is transmitted to the actuator of the circuit breaker, causing the circuit breaker to perform the tripping action. When the coil is de-energized, the electromagnetic force disappears, the reset torsion spring 32 releases the reset torque generated by the elastic deformation, and drives the tripping swing arm 31 to rotate in the opposite direction around the rotation shaft 30, returning to the initial state of the closing position. At the same time, it drives the moving iron core 21 to reset, and the circuit breaker completes the closing action. Throughout the process, the rotation shaft 30 provides a stable rotation fulcrum for the tripping swing arm 31, ensuring smooth power transmission.

[0024] The fixing part 4 is either the coil seat 20 or the frame 1. The purpose of this design is to provide a stable and reliable fixed support for the reset torsion spring 32, ensuring a continuous and stable output of the reset torque. When the fixing part 4 is the coil seat 20, one end of the reset torsion spring 32 is connected to the coil seat 20 by means of a buckle or hook, and the fixed installation state of the coil seat 20 is used to achieve positioning. When the fixing part 4 is the frame 1, one end of the reset torsion spring 32 can also be connected to the frame 1 by means of a buckle or hook, and the rigid support structure of the frame 1 is used to form a fixation, thereby providing a stable installation reference for the reset torsion spring 32, ensuring that its position is stable during deformation and reset, and not affecting the normal operation of the tripping swing arm 31.

[0025] The force-bearing end 310 of the tripping swing arm 31 is provided with a limiting structure 5, which is used to limit the initial angle of the tripping swing arm 31 when it is in the closed position. The purpose of this design is to ensure that the tripping swing arm 31 maintains a fixed initial angle when it is in the closed position, and to ensure the consistency of the opening and closing actions. The limiting structure 5 can be in the form of a boss, a stop, etc., and is assembled with the frame 1 or the coil seat 20 by a fixed connection. When the tripping swing arm 31 returns to the closed position under the action of the reset torsion spring 32, the force-bearing end 310 of the tripping swing arm 31 abuts or cooperates with the limiting structure 5, restricting the further rotation of the tripping swing arm 31, so that the tripping swing arm 31 is always in the preset initial position, providing a stable reference for the subsequent driving cooperation of the moving iron core 21, and not affecting the normal transmission of the mechanism.

[0026] The limiting structure 5 is a limiting pin 50 fixed to the frame 1. The force-bearing end 310 of the tripping swing arm 31 abuts against the limiting pin 50 when in the closed position. The purpose of this design is to provide a clear and stable limit to the initial angle of the closed position of the tripping swing arm 31. The limiting pin 50 is fixed in a preset hole in the frame 1 by a threaded connection. Its structure is simple and easy to install. It forms a direct abutment with the force-bearing end 310 of the tripping swing arm 31. When the tripping swing arm 31 returns to the closed position under the action of the reset torsion spring 32, the limiting pin 50 can effectively prevent it from continuing to rotate, ensuring that the tripping swing arm 31 is in the preset initial position after each closing. At the same time, the shape of the limiting pin 50 facilitates reliable contact with the tripping swing arm 31 and is not prone to misalignment due to long-term use, ensuring the consistency of the subsequent driving action of the moving iron core 21. Moreover, its own structure is robust and can adapt to the repeated action requirements of the mechanism without affecting the smoothness of the overall transmission.

[0027] A status indicator component 6 is provided on the displacement path of the actuating end 311 of the tripping swing arm 31. The displacement of the actuating end 311 triggers the state switching of the status indicator component 6. The purpose of this design is to provide intuitive feedback on the opening and closing status of the circuit breaker through the displacement of the actuating end 311 of the tripping swing arm 31. The status indicator component 6 may be a lever-type structure, a linkage rod structure, or a contact-type structure. It is assembled on the displacement path of the actuating end 311 of the tripping swing arm 31 and forms a fixed connection with the frame 1. When the tripping swing arm 31 moves the actuating end 311 with the opening and closing action, the actuating end 311 will contact or separate from the status indicator component 6, thereby triggering the component to switch to the indication state corresponding to the current circuit opening and closing state. This allows the operator to quickly know the working status of the circuit breaker through the state change of the component without affecting the normal displacement of the tripping swing arm 31 and the overall transmission process of the mechanism.

[0028] The status indicator component 6 includes a button spring 60. When the circuit is closed, the actuating end 311 of the tripping swing arm 31 is in contact with the button spring 60. The purpose of this design is to provide feedback on the opening and closing status of the circuit breaker through the contact relationship between the tripping swing arm 31 and the push button spring 60. The push button spring 60 is a spiral elastic component, with one end fixedly connected to the frame 1 or the circuit breaker body, and the other end in a naturally extended state. In the closed position, the working end 311 of the tripping swing arm 31 is in contact with the periphery of the push button spring 60. When the tripping swing arm 31 causes the working end 311 to move with the opening action, the working end 311 separates from the periphery of the push button spring 60. The switching between the contact and separation states reflects the on / off status of the circuit breaker. At the same time, the spiral structure of the push button spring 60 provides a stable contact point for the working end 311, and its elastic characteristics can adapt to the contact and disengagement process of the working end 311 without affecting the normal displacement of the tripping swing arm 31 and the smooth transmission of the mechanism.

[0029] The actuating end 311 of the tripping swing arm 31 is provided with a button wheel 61, which contacts the button spring 60. The purpose of this design is to optimize the contact fit between the tripping swing arm 31 and the button spring 60, and reduce wear during repeated operation. The button wheel 61 is a circular rolling component, rotatably connected to the actuating end 311 of the tripping swing arm 31 via a pin or bearing. When the tripping swing arm 31 moves the actuating end 311, the button wheel 61 and the circumference of the button spring 60 remain in contact. The circular rolling structure transforms the contact between the two into rolling friction, which, compared to direct rigid contact, effectively reduces wear during repeated contact and separation, extends the service life of the button wheel 61 and the button spring 60, and does not affect the reliability of their state switching or the normal transmission of the tripping swing arm 31.

[0030] According to this embodiment, the circuit breaker opening and closing drive mechanism uses frame 1 as the mounting base. The coil seat 20 of the electromagnetic drive unit 2 is fixed to frame 1, and the moving iron core 21 is axially movable and assembled on the coil seat 20. The rotating shaft 30 of the lever transmission unit 3 is rotatably connected to frame 1. The tripping swing arm 31 is fixed to the rotating shaft 30. The reset torsion spring 32 is sleeved on the rotating shaft 30, with one end connected to the coil seat 20 or frame 1 as a fixing part 4, and the other end acting on the tripping swing arm 31 to provide a reset torque that tends to close. A limit pin 50 is provided near the force-bearing end 310 of the tripping swing arm 31 to limit the initial closing angle. The action end 311 is equipped with a button wheel 61 through a rotating connection between the wheel axle and the shaft hole. The button wheel 61 maintains peripheral contact with the button compression spring 60 on the displacement path. During operation, the coil is energized to drive the moving iron core 21 to move axially and press against the tripping spring. The force-bearing end 310 of the tripping arm 31 overcomes the torque of the reset torsion spring 32 and rotates around the rotating shaft 30. The action end 311 drives the button wheel 61 to move synchronously. The state indication is switched by contacting or separating from the button spring 60. After the coil is de-energized, the reset torsion spring 32 drives the tripping arm 31 back to the initial position defined by the limit pin 50 to complete the closing. This design, through the coordinated cooperation of various components, makes the circuit breaker's opening and closing actions smooth. The assembly method of the reset torsion spring 32 and the rotating shaft 30 ensures the stability of the reset. The setting of the limit pin 50 ensures the consistency of the operating angle of the tripping arm 31. The rolling contact between the button wheel 61 and the button spring 60 reduces component wear. The linkage of the status indication component 6 realizes clear feedback on the circuit breaker's working status, extends the overall service life of the mechanism, and ensures the stability and reliability of the operation process.

[0031] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A circuit breaker opening and closing drive mechanism, comprising a frame (1), characterized in that, Also includes: The electromagnetic drive unit (2) includes a coil seat (20) fixed to the frame (1) and a movable iron core (21) axially movable on the coil seat (20). The lever transmission unit (3) includes a rotating shaft (30) rotatably connected to the frame (1), a release swing arm (31) fixed on the rotating shaft (30), and a reset torsion spring (32) sleeved on the rotating shaft (30). One end of the reset torsion spring (32) is connected to the fixed part (4), and the other end acts on the tripping swing arm (31) to provide it with a reset torque that tends to close the circuit. The moving iron core (21) is used to press against the force-bearing end (310) of the tripping swing arm (31) and drive it to rotate against the torque of the reset torsion spring (32), so that the action end (311) of the tripping swing arm (31) is displaced.

2. The circuit breaker opening and closing drive mechanism according to claim 1, characterized in that, The fixing part (4) is the coil seat (20) or the frame (1).

3. The circuit breaker opening and closing drive mechanism according to claim 1, characterized in that, The force-bearing end (310) of the tripping swing arm (31) is provided with a limiting structure (5) to limit the initial angle of the tripping swing arm (31) when it is in the closed position.

4. The circuit breaker opening and closing drive mechanism according to claim 3, characterized in that, The limiting structure (5) is a limiting pin (50) fixed on the frame (1). The force-bearing end (310) of the tripping swing arm (31) abuts against the limiting pin (50) when the circuit is closed.

5. The circuit breaker opening and closing drive mechanism according to claim 1, characterized in that, A status indicator component (6) is provided on the displacement path of the action end (311) of the tripping swing arm (31), and the displacement of the action end (311) is used to trigger the status switching of the status indicator component (6).

6. The circuit breaker opening and closing drive mechanism according to claim 5, characterized in that, The status indicator component (6) includes a button spring (60), and when the circuit is closed, the actuating end (311) of the tripping swing arm (31) is in contact with the button spring (60).

7. The circuit breaker opening and closing drive mechanism according to claim 6, characterized in that, The action end (311) of the tripping swing arm (31) is provided with a button wheel (61), which is in contact with the button spring (60).

Images