Electric interlocking mechanism of circuit breaker electric operating mechanism

Abstract

The utility model discloses an electric interlocking mechanism of a circuit breaker electric operating mechanism. The electric interlocking mechanism comprises a substrate, a drawer unlocking assembly and an electromagnetic interlocking assembly. An electromagnetic driving mechanism of the electromagnetic interlocking assembly is fixed on the substrate, an output shaft is connected with a locking cushion block, and a power connector is connected with a wire outlet end of the circuit breaker; the drawer unlocking assembly comprises an unlocking lifting pin, an interlocking piece and a locking pin, and sliding connection is achieved through cooperation of a pin shaft and an arc-shaped groove. According to the on-off state of the circuit breaker, locking and unlocking of the low-voltage cabinet unit drawer are automatically controlled. The device has the advantages that use safety is improved, mistaken opening of the drawer during equipment operation is avoided, and personnel safety and system stability are guaranteed; operation is convenient, the drawer is automatically unlocked during power failure, and working efficiency is improved; and a remote regulation and control system is adapted, so that the intelligent and automatic level of remote control of the power system is improved.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to an electric interlocking mechanism for an electric operating mechanism of a circuit breaker, which is particularly suitable for locking and unlocking control of drawers in low-voltage cabinet units. Background Technology

[0002] In modern power systems, the electric operating mechanism of circuit breakers plays a crucial role in achieving efficient and precise remote control. By remotely controlling the opening and closing of circuit breakers, various changes in operating conditions within the power system can be addressed promptly, ensuring the stability and reliability of power supply.

[0003] Especially in low-voltage switchgear unit drawer applications, the use of circuit breaker electric operating mechanisms is becoming increasingly common. However, a critical problem urgently needs to be addressed. When the low-voltage switchgear unit drawer is energized, the lack of an effective interlocking mechanism to ensure the drawer remains locked could lead to accidental opening during equipment operation, posing a risk of electric shock and equipment malfunction, seriously threatening personnel safety and the normal operation of the power system. Conversely, without an automatic unlocking interlocking design when the drawer is de-energized, it would cause significant inconvenience to equipment maintenance and repair work, reducing work efficiency. Therefore, developing an interlocking mechanism that can lock the unit drawer when energized and unlock it when de-energized is of significant practical importance and urgent need. Utility Model Content

[0004] In view of the shortcomings in the prior art, this utility model provides an electric interlocking mechanism for the electric operating mechanism of a circuit breaker.

[0005] The technical solution adopted by this utility model is: an electric interlocking mechanism for an electric operating mechanism of a circuit breaker, including a base plate, a drawer unlocking assembly and an electromagnetic interlocking assembly;

[0006] The electromagnetic interlocking assembly includes an electromagnetic drive mechanism fixed on a base plate and a locking pad connected to the output shaft of the electromagnetic drive mechanism. The power connector of the electromagnetic drive mechanism is connected to the output terminal of the circuit breaker.

[0007] The drawer unlocking assembly includes an unlocking top pin, an interlocking piece, and a locking pin. One end of the unlocking top pin is connected to the interlocking piece via a pin shaft, and the locking pin is fixedly connected to the interlocking piece. The base plate is provided with an arc-shaped groove one and an arc-shaped groove two, and the pin shaft and the locking pin are slidably connected to the arc-shaped groove one and the arc-shaped groove two, respectively.

[0008] When the circuit breaker is energized, the electromagnetic drive mechanism drives the locking pad to block the interlocking piece, thus locking the interlocking piece. When the circuit breaker is de-energized, the electromagnetic drive mechanism retracts, moving the locking pad away from the interlocking piece, thus unlocking the interlocking piece.

[0009] Furthermore, it also includes a locking plate torsion spring, which is installed on the pin of the interlocking plate, with one end of the locking plate torsion spring connected to the locking pin and the other end connected to the base plate, providing a reset spring force for the locking plate to reset.

[0010] Furthermore, a return spring is fitted onto the output shaft of the electromagnetic drive mechanism.

[0011] Furthermore, the interlocking piece is bent upward on one side of the locking pad to form an action piece, and the locking pad is provided with an action surface that is adapted to the action piece.

[0012] Furthermore, it also includes a micro switch located on one side of the interlocking plate. When the interlocking plate is in the locked state, the interlocking plate presses the micro switch to connect the circuit of the circuit breaker's electric operating mechanism.

[0013] Furthermore, it also includes a status indicator component, which includes an action plate rotatably connected to a rotating shaft on the base plate, an indicator plate disposed on the action plate, an indicator torsion spring, and a drive pin fixed on the action plate. The indicator torsion spring is fitted onto the rotating shaft, with one end connected to the drive pin and the other end connected to a torsion spring post on the base plate. The drive pin engages with a guide groove on the drawer shelf to drive the position indicator plate to rotate and display the status when the drawer moves.

[0014] The beneficial effects of this utility model are:

[0015] 1. Improved safety: When the circuit breaker is energized, the electromagnetic drive mechanism activates the locking pad to block the interlocking plate, keeping the low-voltage cabinet unit drawer locked. This design effectively prevents the drawer from being accidentally opened during equipment operation, greatly reducing the risk of electric shock and ensuring personnel safety. It also reduces the possibility of equipment failure due to accidental drawer opening, maintaining the stable operation of the power system.

[0016] 2. Convenient Operation: When the circuit breaker is de-energized, the electromagnetic drive mechanism retracts, the locking pad moves away from the interlocking plate, and the drawer automatically unlocks. This feature eliminates the need for complex manual unlocking by equipment maintenance and repair personnel, greatly improving work efficiency and reducing operation time and labor costs.

[0017] 3. From the perspective of system adaptability: The electromagnetic drive mechanism power connector of the electromagnetic interlocking component is connected to the circuit breaker output terminal, which can accurately respond according to the power-on and power-off status of the circuit breaker, perfectly meeting the needs of remote control of power system to control the opening and closing of circuit breakers, and further improving the intelligence and automation level of remote control of the entire power system.

[0018] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The utility model will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram from another perspective of the present invention.

[0021] Figure 3 This is a schematic diagram of the substrate structure.

[0022] Figure 4 This is a schematic diagram of the output shaft and torsion spring column.

[0023] Figure 1-4 In the middle: 1. Base plate; 2. Electromagnetic drive mechanism; 3. Output shaft; 4. Locking pad; 5. Power connector; 6. Unlocking pin; 7. Interlocking plate; 8. Locking pin; 11. Pin shaft; 12. Arc groove one; 13. Arc groove two; 14. Locking plate torsion spring; 16. Return spring; 17. Actuating plate; 18. Actuating surface; 19. Micro switch; 20. Rotating shaft; 21. Actuating plate; 22. Indicator plate; 23. Drive pin; 24. Indicating torsion spring; 25. Torsion spring column. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] This utility model provides an electric interlocking mechanism for the electric operating mechanism of a circuit breaker.

[0027] In this embodiment, refer to Figure 1-3 The electric interlocking mechanism of the circuit breaker electric operating mechanism includes a base plate 1, a drawer unlocking assembly and an electromagnetic interlocking assembly.

[0028] The electromagnetic interlocking assembly includes an electromagnetic drive mechanism 2 fixed on a base plate 1 and a locking pad 4 connected to the output shaft 3 of the electromagnetic drive mechanism. The power connector 5 of the electromagnetic drive mechanism is connected to the output terminal of the circuit breaker.

[0029] The drawer unlocking assembly includes an unlocking top pin 6, an interlocking piece 7, and a locking pin 8. One end of the unlocking top pin is connected to the interlocking piece via a pin 11, and the locking pin is fixedly connected to the interlocking piece. The base plate is provided with an arc-shaped groove 12 and an arc-shaped groove 13, and the pin and the locking pin are slidably connected to the arc-shaped groove 12 and the arc-shaped groove 13, respectively.

[0030] When the circuit breaker is energized, the electromagnetic drive mechanism drives the locking pad to block the interlocking piece, thus locking the interlocking piece. When the circuit breaker is de-energized, the electromagnetic drive mechanism retracts, moving the locking pad away from the interlocking piece, thus unlocking the interlocking piece.

[0031] The electric interlocking mechanism in the above technical solution includes a base plate, a drawer unlocking assembly, and an electromagnetic interlocking assembly. The electromagnetic drive mechanism of the electromagnetic interlocking assembly is fixed to the base plate, its output shaft is connected to a locking pad, and its power connector is connected to the circuit breaker's output terminal, enabling it to operate according to the circuit breaker's on / off state. The unlocking pin and interlocking plate of the drawer unlocking assembly are connected by a pin shaft, and the locking pin is fixed to the connecting plate. The pin shaft and locking pin slide within arc-shaped groove one and arc-shaped groove two on the base plate, respectively. When the circuit breaker is energized, the electromagnetic drive mechanism drives the locking pad to block the interlocking plate; when de-energized, the electromagnetic drive mechanism retracts, and the locking pad moves away from the interlocking plate. This achieves automatic control of the locking and unlocking of the low-voltage cabinet unit drawer according to the circuit breaker's on / off state, ensuring operational safety and facilitating equipment maintenance.

[0032] The accompanying drawings in this application are all schematic diagrams of the locked state. When the top pin is subjected to force, the pin shaft and the locking pin move from the position shown in the drawings to the other end of the arc groove one and arc groove two, which is the unlocked state.

[0033] Specifically, it also includes a locking plate torsion spring 14, which is installed on the pin of the interlocking plate, with one end of the locking plate torsion spring connected to the locking pin and the other end connected to the base plate, providing a reset spring force for the locking plate to reset.

[0034] In this embodiment, the locking plate torsion spring is mounted on a pin, with one end connected to a locking pin and the other end connected to a base plate (e.g., by screws). When the interlocking plate deviates from its initial position under external force, the locking plate torsion spring provides a restoring force, causing the interlocking plate to return to its original position. This ensures that the interlocking plate can reliably reset after unlocking, preparing for the next locking operation and enhancing the stability and reliability of the interlocking mechanism.

[0035] Specifically, a return spring 16 is fitted onto the output shaft of the electromagnetic drive mechanism.

[0036] In this embodiment, the electromagnetic drive structure is widely used and belongs to existing conventional technology. Common electromagnetic drive structures generally consist of basic components such as an electromagnetic coil, an iron core, and an armature. When the electromagnetic coil is energized, it generates a magnetic field. The iron core is magnetized under the influence of the magnetic field, which in turn attracts the armature to move, thereby achieving the driving function. As in the electromagnetic drive mechanism of this patent, the magnetic force generated by the energized electromagnetic coil drives the output shaft to move the locking pad. This driving method based on the principle of electromagnetic induction has been widely used in the field of electrical equipment for a long time, and the technology is mature. Its working principle, structural design, and manufacturing process are well known to those skilled in the art. Further details will not be elaborated upon here.

[0037] This application places a reset torsion spring on the output shaft. When the electromagnetic drive mechanism is de-energized, the spring force pushes the output shaft back, causing the locking pad to move away from the interlocking plate. When energized, the electromagnetic force overcomes the spring force of the reset spring, driving the output shaft to extend, causing the locking pad to block the interlocking plate.

[0038] Specifically, the interlocking piece is bent upward on one side of the locking pad to form an action piece 17, and the locking pad is provided with an action surface 18 that is adapted to the action piece 17.

[0039] In this embodiment, the interlocking piece is bent upward on one side of the locking pad to form an action piece, and the locking pad has an action surface adapted to the action piece. When the electromagnetic drive mechanism drives the locking pad to move, the action surface interacts with the action piece, precisely limiting the position of the interlocking piece and realizing the switching between locked and unlocked states. This makes the locking and unlocking actions of the interlocking piece more precise and reliable, improving the working accuracy of the interlocking mechanism.

[0040] Specifically, it also includes a micro switch 19 located on one side of the interlocking plate. When the interlocking plate is in the locked state, the interlocking plate presses the micro switch to connect the circuit of the circuit breaker's electric operating mechanism.

[0041] In this embodiment, a microswitch is installed on one side of the interlocking plate. When the interlocking plate is in the locked state, it presses the microswitch, thereby connecting the circuit of the circuit breaker's electric operating mechanism. When the interlocking plate is unlocked, the microswitch returns to its initial state, and the circuit is disconnected. The circuit of the circuit breaker's electric operating mechanism is only connected and operable when the interlocking plate is in the locked state, avoiding accidental operation of the circuit breaker in an unsafe state and further ensuring operational safety.

[0042] Specifically, it also includes a status indicator component, which includes an action plate 21 rotatably connected to a rotating shaft 20 on the base plate, an indicator plate 22 disposed on the action plate 21, an indicator torsion spring 23, and a drive pin 24 fixed on the action plate. The indicator torsion spring is fitted onto the rotating shaft, with one end connected to the drive pin and the other end connected to a torsion spring post 25 on the base plate. The drive pin engages with a guide groove on the drawer shelf to drive the position indicator plate to rotate and display the status when the drawer moves.

[0043] In this embodiment, the status indicator component includes an action plate rotatably connected to the base plate's rotating shaft, an indicator plate on the action plate, an indicator torsion spring, and a drive pin fixed to the action plate. The indicator torsion spring is fitted onto the rotating shaft, with one end connected to the drive pin and the other end connected to a torsion spring post on the base plate. When the drawer moves, the guide groove on the drawer shelf engages with the drive pin, causing the action plate to rotate, which in turn causes the indicator plate to rotate and display the drawer status. The indicator plate displays the status (such as unlocked and locked), providing a clear understanding of the drawer's position and facilitating timely monitoring of the equipment's operation, thus improving the convenience of equipment operation and maintenance.

[0044] Attention all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. An electric interlocking mechanism for an electric operating mechanism of a circuit breaker, characterized in that: Includes a base plate, drawer unlocking assembly, and electromagnetic interlock assembly; The electromagnetic interlocking assembly includes an electromagnetic drive mechanism fixed on a base plate and a locking pad connected to the output shaft of the electromagnetic drive mechanism. The power connector of the electromagnetic drive mechanism is connected to the output terminal of the circuit breaker. The drawer unlocking assembly includes an unlocking top pin, an interlocking piece, and a locking pin. One end of the unlocking top pin is connected to the interlocking piece via a pin shaft, and the locking pin is fixedly connected to the interlocking piece. The base plate is provided with an arc-shaped groove one and an arc-shaped groove two, and the pin shaft and the locking pin are slidably connected to the arc-shaped groove one and the arc-shaped groove two, respectively. When the circuit breaker is energized, the electromagnetic drive mechanism drives the locking pad to block the interlocking piece, thus locking the interlocking piece. When the circuit breaker is de-energized, the electromagnetic drive mechanism retracts, moving the locking pad away from the interlocking piece, thus unlocking the interlocking piece.

2. The electric interlocking mechanism of the circuit breaker electric operating mechanism according to claim 1, characterized in that: It also includes a locking plate torsion spring, which is mounted on the pin of the interlocking plate, with one end of the locking plate torsion spring connected to the locking pin and the other end connected to the base plate, providing a reset spring force for the locking plate to reset.

3. The electric interlocking mechanism of the circuit breaker electric operating mechanism according to claim 1, characterized in that: A return spring is fitted onto the output shaft of the electromagnetic drive mechanism.

4. The electric interlocking mechanism of the circuit breaker electric operating mechanism according to claim 1, characterized in that: The interlocking piece is bent upward on one side of the locking pad to form an action piece, and the locking pad is provided with an action surface that matches the action piece.

5. The electric interlocking mechanism of the circuit breaker electric operating mechanism according to claim 1, characterized in that: It also includes a micro switch located on one side of the interlocking plate. When the interlocking plate is in the locked state, the interlocking plate presses the micro switch to connect the circuit of the circuit breaker's electric operating mechanism.

6. The electric interlocking mechanism of the circuit breaker electric operating mechanism according to claim 1, characterized in that: It also includes a status indicator component, which includes an action plate rotatably connected to a pivot on the base plate, an indicator plate disposed on the action plate, an indicator torsion spring, and a drive pin fixed on the action plate. The indicator torsion spring is fitted onto the pivot, with one end connected to the drive pin and the other end connected to a torsion spring post on the base plate. The drive pin engages with a guide groove on the drawer shelf to drive the position indicator plate to rotate and display the status when the drawer moves.

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