Release structure for circuit breaker
By integrating components such as microswitches, pull rods, trip rods, and permanent magnets into a trip unit structure, the problem of multi-functional integration of circuit breakers within a limited space is solved. This achieves the integration of contact position indication, shunt trip, and circuit breaker trip functions, thereby improving the protection effect of electrical equipment.
Patent Information
- Application Number
- CN202422805262.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-18
AI Technical Summary
Existing circuit breakers are difficult to integrate multi-functional protection devices within limited space, and the separation of undervoltage and overvoltage trip units results in incomplete protection.
Design a trip unit structure that integrates components such as microswitches, pull rods, trip rods, permanent magnets, and coils to achieve the functions of contact position indication, shunt tripping, and circuit breaker tripping in one unit. Circuit conduction is achieved through circuit boards and terminals, enhancing stability and compactness.
The circuit breaker features a compact structure, comprehensive functions, and can fully protect electrical equipment, ensure stable operation, and integrate multi-functional protection.
Smart Images
Figure CN223501787U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-voltage electrical appliance manufacturing technology, specifically to a trip unit structure for circuit breakers. Background Technology
[0002] With the development of power systems, the functional requirements for circuit breakers are increasing. How to integrate more circuit breaker accessories within the limited space of a circuit breaker has become a problem that technicians need to consider. Circuit breakers are usually equipped with undervoltage or overvoltage trip units to achieve undervoltage or overvoltage protection for electrical equipment.
[0003] When an undervoltage release is used in conjunction with a circuit breaker in electrical equipment, the undervoltage release should operate as follows: even if the input voltage of the electrical equipment slowly drops to between 70% and 35% of its rated voltage, the undervoltage release should open the circuit. Therefore, the undervoltage release prevents the electrical equipment from closing under abnormal conditions where its supply voltage is below 35% of its rated voltage. The undervoltage release also allows the electrical equipment to close when its supply voltage is equal to or higher than 85% of its rated voltage.
[0004] When an overvoltage trip unit is used in conjunction with a circuit breaker on electrical equipment, the overvoltage trip unit shall operate as follows: when the supply voltage of the electrical equipment exceeds a specific trigger value, the overvoltage trip unit shall open the circuit of the electrical equipment. Summary of the Invention
[0005] This invention addresses the shortcomings of existing technologies by providing a trip unit structure for circuit breakers. This structure is compact, feature-rich, and offers excellent operational stability. It integrates contact position indication, shunt tripping, and circuit breaker tripping functions into one, providing more comprehensive protection for electrical equipment.
[0006] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions:
[0007] A trip unit structure for a circuit breaker includes a base housing with two cavities, designated as cavity I and cavity II. A trip rod is housed in cavity I. A pull rod fixed to the front end of the trip rod is located on the side of the base housing. A metal bracket is located at the rear of the trip rod, and a permanent magnet is positioned between the rear end of the trip rod and the metal bracket. A microswitch is housed in cavity II, and a rocker arm is located on the side of the microswitch. A rocker arm return spring is positioned between the rocker arm and the microswitch.
[0008] Preferably, the rear end of the metal bracket is provided with a pressure plate that is movably sleeved with the metal bracket, and a release spring that is sleeved with the release rod is provided between the pressure plate and the pull rod.
[0009] Preferably, the base housing is provided with a circuit board, the metal bracket is provided with a coil that is welded and fixed to the circuit board, the upper rear end of the circuit board is provided with a rear terminal, and the upper front end of the circuit board is provided with a front terminal.
[0010] Preferably, the upper end of the circuit board is provided with an end cap that is snap-fitted and fixed to the base housing.
[0011] Preferably, the micro switch, rear terminal, and front terminal are all soldered onto the circuit board, so that the circuit is connected between the circuit board and the micro switch, rear terminal, front terminal, and coil.
[0012] Preferably, the pull rod is engaged in the groove of the release rod and moves together with the release rod.
[0013] This invention can achieve the following effects:
[0014] This invention provides a trip unit structure for circuit breakers, which, compared with existing technologies, features a compact structure, comprehensive functions, and good operational stability. It integrates contact position indication, shunt tripping, and circuit breaker tripping functions into one, providing more comprehensive protection for electrical equipment. Attached Figure Description
[0015] Figure 1 This is a side view of the structure of this utility model.
[0016] Figure 2 This is a top view of the structure of this utility model.
[0017] Figure 3 This is a schematic diagram of the internal structure of this utility model.
[0018] In the diagram: 1. Base housing; 2. End cap; 3. Circuit board; 4. Rear terminal block; 5. Micro switch; 6. Rocker arm; 7. Rocker arm return spring; 8. Front terminal block; 9. Pull rod; 10. Tripping rod; 11. Chamber I; 12. Pressure plate; 13. Metal bracket; 14. Coil; 15. Permanent magnet; 16. Chamber II; 17. Tripping spring. Detailed Implementation
[0019] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.
[0020] Example: Figure 1 , Figure 2 and Figure 3As shown, a trip unit structure for a circuit breaker includes a base housing 1. The base housing 1 has two cavities, designated as cavity I 11 and cavity II 16. A circuit board 3 is mounted on the base housing 1, with an end cap 2 that is snap-fitted and fixed to the base housing 1 at its upper end. A coil 14, welded and fixed to the circuit board 3, is housed within a metal bracket 13. A rear terminal 4 is located at the upper rear end of the circuit board 3, and a front terminal 8 is located at the upper front end. A trip rod 10 is located within cavity I 11, and a pull rod 9, fixed to the front end of the trip rod 10, is located on the side of the base housing 1. The pull rod 9 engages within a groove in the trip rod 10 and moves together with it. A metal bracket 13 is provided at the rear of the trip lever 10. A permanent magnet 15 is provided between the rear end of the trip lever 10 and the metal bracket 13. A pressure plate 12 is provided inside the rear end of the metal bracket 13 and is movably sleeved with the metal bracket 13. A trip spring 17 is provided between the pressure plate 12 and the pull rod 9 and is sleeved with the trip lever 10. A micro switch 5 is provided in the cavity II 16. A rocker arm 6 is provided on the side of the micro switch 5. A rocker arm return spring 7 is provided between the rocker arm 6 and the micro switch 5. The micro switch 5, the rear terminal 4, and the front terminal 8 are all soldered to the circuit board 3, so that the circuit between the circuit board 3 and the micro switch 5, the rear terminal 4, the front terminal 8, and the coil 14 is conductive.
[0021] Working principle: The circuit breaker shaft rotates with the closing and opening of the circuit breaker. At this time, the shaft will drive the rocker arm 6 to rotate, and the rocker arm 6 will switch the state of the micro switch 5. The signal is then transmitted to the rear terminal 4 through the circuit board 3. At this time, the circuit breaker controller can be connected to the rear terminal 4 to read the state of the contacts.
[0022] When the circuit breaker is re-clamped, the pull rod 9 moves to the right, causing the trip rod 10 to engage with the permanent magnet 15. At this time, the trip unit is reset, the trip spring 17 is compressed, and the trip unit is ready to trip. At this time, energy is supplied to the coil 14 through the front terminal 8 or the rear terminal 4 to make the trip rod 10 disengage from the attraction of the permanent magnet 15. The trip spring 17 begins to return to its original state, and the trip rod 10 moves to the left under the action of the trip spring 17, pushing the pull rod 9 to the left. The pull rod 9 pulls the traction rod to complete the tripping action of the circuit breaker.
[0023] The front terminal 8 is used by the user for shunt tripping function, and the rear terminal 4 sends status signals to the circuit breaker and receives tripping signals from the circuit breaker.
[0024] In summary, the trip unit structure for circuit breakers is characterized by its compact structure, comprehensive functions, and good operational stability. It integrates contact position indication, shunt tripping, and circuit breaker tripping functions into one, providing more comprehensive protection for electrical equipment.
[0025] It will be apparent to those skilled in the art that this invention 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 essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0026] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.
Claims
1. A trip unit structure for a circuit breaker, characterized in that: The system includes a base housing (1), which has two cavities, namely cavity I (11) and cavity II (16); a tripping rod (10) is provided in cavity I (11), and a pull rod (9) fixed to the front end of the tripping rod (10) is provided on the side of the base housing (1), and a metal bracket (13) is provided at the rear of the tripping rod (10), and a permanent magnet (15) is provided between the rear end of the tripping rod (10) and the metal bracket (13); a micro switch (5) is provided in cavity II (16), and a rocker arm (6) is provided on the side of the micro switch (5), and a rocker arm return spring (7) is provided between the rocker arm (6) and the micro switch (5).
2. The trip unit structure for a circuit breaker according to claim 1, characterized in that: The metal bracket (13) is provided with a pressure plate (12) that is movably connected to the metal bracket (13) at its rear end. A release spring (17) that is connected to the release rod (10) is provided between the pressure plate (12) and the pull rod (9).
3. The trip unit structure for a circuit breaker according to claim 2, characterized in that: The base housing (1) is provided with a circuit board (3), and the metal bracket (13) is provided with a coil (14) that is welded and fixed to the circuit board (3). The upper rear end of the circuit board (3) is provided with a rear terminal (4), and the upper front end of the circuit board (3) is provided with a front terminal (8).
4. The trip unit structure for a circuit breaker according to claim 3, characterized in that: The circuit board (3) is provided with an end cap (2) that is snapped and fixed to the base housing (1).
5. The trip unit structure for a circuit breaker according to claim 3, characterized in that: The micro switch (5), rear terminal (4), and front terminal (8) are all soldered onto the circuit board (3), so that the circuit is connected between the circuit board (3) and the micro switch (5), rear terminal (4), front terminal (8), and coil (14).
6. The trip unit structure for a circuit breaker according to claim 1, characterized in that: The pull rod (9) is engaged in the groove of the release rod (10) and moves together with the release rod (10).