An electromagnetic system for a molded case circuit breaker

Abstract

This utility model discloses an electromagnetic system for a molded case circuit breaker, including a magnetic yoke, a coil frame fixedly mounted on the magnetic yoke, and a coil sleeved on the outside of the coil frame. One end of the coil is connected to a stationary contact, and the other end of the coil is connected to a conductive element. A through slot is opened in the middle of the coil frame, and a moving iron core is slidably installed inside the through slot. A push rod is fixedly connected to one side of the moving iron core, and a reaction spring is sleeved on the outside of the push rod. A stationary iron core is rotatably installed at one end of the coil frame. A square slot is opened on one side of the stationary iron core, and a square block is slidably installed inside the square slot. A drive ring is integrally formed on one side of the square block. This utility model, through the square block, drive ring, internal thread, external thread, and stationary iron core, allows the resistance applied by the reaction spring to the moving iron core to be adjusted by rotating the stationary iron core, thereby changing the current required to trigger the movement of the moving iron core, so as to adapt to molded case circuit breakers with different rated current specifications.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to an electromagnetic system for a molded case circuit breaker. Background Technology

[0002] The electromagnetic system of a molded case circuit breaker is one of its core protection components. It is mainly used to drive the circuit breaker to trip when a circuit fault occurs, thereby realizing the circuit protection function. The electromagnetic system mainly consists of a magnetic yoke, coil frame, coil, push rod, moving iron core, stationary iron core, and return spring. Its working principle is that when the circuit current is normal, the magnetic force generated by the coil is small and insufficient to overcome the resistance of the return spring. The moving iron core remains stationary, and the circuit is normally conducting. When a circuit fault occurs, the current in the coil increases, and the magnetic force generated by the coil exceeds the resistance of the return spring. The moving iron core is attracted and moves, which drives the push rod to move. The push rod triggers the tripping mechanism to disconnect the circuit through mechanical linkage.

[0003] Traditional electromagnetic systems have difficulty changing the current required to trigger the movement of the moving iron core, which means that the same electromagnetic system can usually only be used with molded case circuit breakers of a single rated current specification, resulting in significant limitations in its application. Utility Model Content

[0004] The purpose of this invention is to provide an electromagnetic system for a molded case circuit breaker to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an electromagnetic system for a molded case circuit breaker, comprising a magnetic yoke, a coil frame fixedly mounted on the magnetic yoke, and a coil sleeved on the outside of the coil frame. One end of the coil is connected to a stationary contact, and the other end of the coil is connected to a conductive element. A through groove is formed in the middle of the coil frame, and a moving iron core is slidably installed inside the through groove. A push rod is fixedly connected to one side of the moving iron core, and a reaction spring is sleeved on the outside of the push rod. A stationary iron core is rotatably installed at one end of the coil frame, and a square groove is formed on one side of the stationary iron core. A square block is slidably installed inside the square groove, and a drive ring is integrally formed on one side of the square block. An external thread is provided on the outside of the drive ring, and an internal thread that mates with the external thread is formed on the inner wall of the through groove.

[0006] As a preferred embodiment of this utility model, a convex ring is provided on the outer side of the stationary iron core, and an annular groove is provided on the inner side wall of the coil frame, with the convex ring rotatably installed inside the annular groove.

[0007] As a preferred embodiment of this utility model, both the drive ring and the square block are provided with circular grooves, and both the stationary iron core and the square block are provided with through holes.

[0008] As a preferred embodiment of this utility model, the outer side of the stationary iron core is provided with grooves evenly distributed circumferentially.

[0009] As a preferred embodiment of this utility model, the magnetic yoke is provided with a rotating groove for supporting the rotation of the stationary iron core, and one end of the stationary iron core extends into the rotating groove.

[0010] Compared with the prior art, the beneficial effects of this utility model are: by setting up a square block, a drive ring, an internal thread, an external thread and a stationary iron core, the rotation of the stationary iron core can adjust the resistance applied by the reaction spring to the moving iron core, thereby changing the current required to trigger the movement of the moving iron core, so as to adapt to molded case circuit breakers with different rated current specifications. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0012] Figure 2 This is a cross-sectional view of the present invention;

[0013] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle;

[0014] Figure 4 This utility model Figure 1 Exploded view;

[0015] Figure 5 This is a schematic diagram of the coil frame structure of this utility model;

[0016] Figure 6 This is a schematic diagram of the structure of the drive ring and the square block of this utility model;

[0017] Figure 7 This is a schematic diagram of the static iron core of this utility model.

[0018] In the diagram: 1. Magnetic yoke; 2. Coil frame; 3. Coil; 4. Conductive component; 5. Stationary contact; 6. Push rod; 7. Stationary iron core; 8. Moving iron core; 9. Reaction spring; 10. Internal thread; 11. Convex ring; 12. Annular groove; 13. Groove; 14. Through hole; 15. Square block; 16. Drive ring; 17. External thread; 18. Through groove; 19. Circular groove; 20. Square groove; 21. Rotary groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1 to 7This utility model provides a technical solution: an electromagnetic system for a molded case circuit breaker, including a magnetic yoke 1, a coil frame 2 fixedly mounted on the magnetic yoke 1, and a coil 3 sleeved on the outside of the coil frame 2. When the circuit current is normal, the magnetic force generated by the coil 3 is small, and the moving iron core 8 is insufficient to overcome the resistance of the counterforce spring 9, so the moving iron core 8 remains stationary. When a circuit fault occurs, the current in the coil 3 increases, and the magnetic force generated by the coil 3 exceeds the resistance of the counterforce spring 9, causing the moving iron core 8 to be attracted and move. The moving iron core 8 drives the push rod 6 to move, and the push rod 6 triggers the tripping mechanism to disconnect the circuit through mechanical linkage. One end of the coil 3 is connected to... The stationary contact 5 and the other end of the coil 3 are connected to a conductive element 4. A through slot 18 is provided in the middle of the coil frame 2. A moving iron core 8 is slidably installed inside the through slot 18. One end of the push rod 6 passes through the drive ring 16, the square block 15, the stationary iron core 7, and the magnetic yoke 1 in sequence and extends to the outside of the magnetic yoke 1. The push rod 6 is fixedly connected to one side of the moving iron core 8. A reaction spring 9 is sleeved on the outside of the push rod 6. One end of the reaction spring 9 abuts against the moving iron core 8, and the other end abuts against the square block 15. The reaction spring 9 cannot pass through the through hole 14. The reaction spring 9 is used to apply resistance to the moving iron core 8 to ensure that the moving iron core 8 remains in its original position under normal current. A stationary iron core 7 is rotatably mounted at one end of the coil frame 2. A square groove 20 is formed on one side of the stationary iron core 7. A square block 15 is slidably mounted inside the square groove 20. The square block 15 and the square groove 20 cooperate to allow the stationary iron core 7 to drive the square block 15 to rotate, and the square block 15 and the stationary iron core 7 can also slide. A drive ring 16 is integrally formed on one side of the square block 15. The outer side of the drive ring 16 is provided with an external thread 17. The inner wall of the through groove 18 is provided with an internal thread 10 that cooperates with the external thread 17. Under the action of the external thread 17 and the internal thread 10, when the drive ring 16 rotates, the drive ring 16 will move along the through groove 18. If the direction of slot 18 is displaced, and the drive ring 16 is moved closer to the moving iron core 8, the square block 15 will compress the reaction spring 9. At this time, the resistance exerted by the reaction spring 9 on the moving iron core 8 increases, and the current required to trigger the movement of the moving iron core 8 increases. If the drive ring 16 is moved away from the moving iron core 8, the reaction spring 9 gradually extends as the square block 15 moves. At this time, the resistance exerted by the reaction spring 9 on the moving iron core 8 decreases, and the current required to trigger the movement of the moving iron core 8 decreases. Thus, the magnitude of the current required to trigger the movement of the moving iron core 8 can be changed to adapt to molded case circuit breakers with different rated current specifications, thereby improving practicality.

[0021] The stationary iron core 7 has a convex ring 11 on its outer side and an annular groove 12 on the inner side wall of the coil frame 2. The convex ring 11 is rotatably installed inside the annular groove 12. The convex ring 11 and the annular groove 12 are used to limit the stationary iron core 7, so that the stationary iron core 7 can rotate with the coil frame 2, but cannot be displaced in the horizontal or vertical direction with the coil frame 2, thus preventing the stationary iron core 7 from shifting.

[0022] Both the drive ring 16 and the square block 15 have circular grooves 19, which are used to limit the reaction spring 9. The circular grooves 19 on the square block 15 are connected to the through holes 14. Both the stationary iron core 7 and the square block 15 have through holes 14, which allow the top rod 6 to extend out of the coil frame 2.

[0023] Among them, the outer side of the stationary iron core 7 is evenly provided with grooves 13 along the circumference, which makes it convenient for workers to use tools to push the stationary iron core 7 to rotate.

[0024] The magnetic yoke 1 has a rotating groove 21 for supporting the rotation of the stationary iron core 7. One end of the stationary iron core 7 extends into the rotating groove 21, and the other end of the stationary iron core 7 can rotate within the rotating groove 21 to ensure the stability of the stationary iron core 7.

[0025] Specifically, when it is necessary to change the current required to trigger the movement of the moving iron core 8, a tool is inserted into the groove 13 to push the stationary iron core 7 to rotate. The stationary iron core 7 drives the square block 15 to rotate, and the square block 15 drives the drive ring 16 to rotate. Under the action of the internal thread 10 and the external thread 17, the drive ring 16 moves. If the drive ring 16 rotates clockwise, it will move towards the moving iron core 8. The drive ring 16 drives the square block 15 to move, and the square block 15 will compress the reaction spring 9. At this time, the reaction spring 9 exerts a force on the moving iron core 8. As the resistance applied by the iron core 8 increases, the current required to trigger the movement of the moving iron core 8 also increases. If the drive ring 16 rotates counterclockwise, it will move away from the moving iron core 8. The drive ring 16 drives the square block 15 to move. As the square block 15 moves, the reaction spring 9 gradually extends. At this time, the resistance applied by the reaction spring 9 to the moving iron core 8 decreases, and the current required to trigger the movement of the moving iron core 8 decreases. Thus, the resistance applied by the reaction spring 9 to the moving iron core 8 can be adjusted to change the magnitude of the current required to trigger the movement of the moving iron core 8.

[0026] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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.

[0027] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic system for a molded case circuit breaker, comprising a magnetic yoke (1), a coil frame (2) fixedly mounted on the magnetic yoke (1), and a coil (3) sleeved on the outside of the coil frame (2), wherein one end of the coil (3) is connected to a stationary contact (5), and the other end of the coil (3) is connected to a conductive element (4), characterized in that: The coil frame (2) has a through groove (18) in the middle. A moving iron core (8) is slidably installed inside the through groove (18). A push rod (6) is fixedly connected to one side of the moving iron core (8). A reaction spring (9) is sleeved on the outside of the push rod (6). A stationary iron core (7) is rotatably installed at one end of the coil frame (2). A square groove (20) is opened on one side of the stationary iron core (7). A square block (15) is slidably installed inside the square groove (20). A drive ring (16) is integrally formed on one side of the square block (15). An external thread (17) is provided on the outside of the drive ring (16). An internal thread (10) that matches the external thread (17) is opened on the inner wall of the through groove (18).

2. The electromagnetic system of a molded case circuit breaker according to claim 1, characterized in that: The outer side of the stationary iron core (7) is provided with a convex ring (11), and the inner side wall of the coil frame (2) is provided with an annular groove (12). The convex ring (11) is rotatably installed inside the annular groove (12).

3. The electromagnetic system of a molded case circuit breaker according to claim 1, characterized in that: Both the drive ring (16) and the square block (15) are provided with circular grooves (19), and both the stationary iron core (7) and the square block (15) are provided with through holes (14).

4. The electromagnetic system of a molded case circuit breaker according to claim 1, characterized in that: The outer side of the stationary iron core (7) is uniformly provided with grooves (13) along the circumference.

5. The electromagnetic system of a molded case circuit breaker according to claim 1, characterized in that: The magnetic yoke (1) has a rotating groove (21) for supporting the rotation of the stationary iron core (7), and one end of the stationary iron core (7) extends into the rotating groove (21).

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