A molded case circuit breaker armature assembly

Abstract

The utility model relates to a plastic case circuit breaker armature assembly. The utility model solves the technical problem to provide a plastic case circuit breaker armature assembly. The utility model adopts the technical scheme: including armature support, circuit breaker thermal element, iron core, armature rotatably arranged on the armature support through pivot, armature locking assembly, the circuit breaker thermal element includes the thermal element receiving portion of horizontal arrangement and the thermal element fixed part vertically arranged one end at thermal element receiving portion, is equipped with the thermal element let -alone hole on thermal element receiving portion, is equipped with the thermal element butt joint hole on thermal element fixed part. The utility model has the advantages of: preventing the spring from falling back after the circuit breaker tripping and pushing the armature tripping lock block back to the blocking position, so that the armature cannot reset under the condition of not eliminating the fault, even if the operator forcibly pushes the switch handle, it is also impossible to realize closing, fundamentally prevents the misoperation of the circuit breaker under the hidden danger state, and significantly improves the safety and reliability of the circuit breaker.

Description

Technical Field

[0001] This utility model relates to an armature assembly for a molded case circuit breaker. Background Technology

[0002] In the tripping mechanism of a molded case circuit breaker, the armature assembly is a crucial component for achieving electromagnetic tripping. The armature assembly typically consists of an armature, an iron core, a heating element, and its support. Its main function is to use the magnetic force generated by the electromagnetic coil to attract the armature when a short circuit or severe overload occurs, thereby tripping the circuit breaker mechanism and achieving rapid circuit disconnection.

[0003] In most traditional structures, the armature automatically returns to its original position after the circuit breaker trips, following the switch reset action. Even if the circuit fault is not eliminated, the armature can still return to its original position if the operator forcibly closes the circuit breaker, causing the circuit breaker to close again. This poses a serious risk of accidental closure under hazardous conditions. Improvements and optimizations are made to address this issue. Utility Model Content

[0004] To solve the above problems, the technical problem to be solved by this utility model is to provide an armature assembly for a molded case circuit breaker.

[0005] The technical solution adopted by the armature assembly of the molded case circuit breaker of this utility model is characterized by including an armature bracket, a circuit breaker thermal element, an iron core, an armature rotatably mounted on the armature bracket via a rotating shaft, and an armature locking assembly. The circuit breaker thermal element includes a horizontally arranged thermal element receiving part and a thermal element fixing part vertically arranged at one end of the thermal element receiving part. The thermal element receiving part is provided with a thermal element clearance hole, and the thermal element fixing part is provided with a thermal element mating hole. The armature includes an armature magnetic attraction part, the upper end of which bends outward to form an armature release foot, and the lower end of which flips and extends to form an armature reinforcement part that fits against the outside of the armature magnetic attraction part. Armature swing blocks are provided on both sides of the upper end of the armature magnetic attraction part, and armature driving holes are provided on the armature swing blocks. The armature locking assembly includes an armature release locking block, an anti-return spring, and a locking block linkage rod that are connected to the lower end of the armature magnetic attraction part. The locking block linkage rod includes a linkage rod body. The armature release locking block has a wedge-shaped structure with a higher inner side and a lower outer side. A locking block connecting hole is provided at the bottom of the armature release locking block. The linkage rod body passes through the heat element clearance hole below the heat element receiving part and is connected and fixed to the locking block connecting hole. The anti-return spring is sleeved on the linkage rod body, with one end abutting the bottom of the armature release locking block and the other end abutting the heat element receiving part.

[0006] The iron core includes an iron core body that is attached to the outside of the heating element fixing part. The left and right ends of the iron core body are vertically bent to form iron core sides for strengthening the magnetic field. The iron core body is provided with iron core docking holes corresponding to the docking holes of the heating element.

[0007] The armature bracket includes a bracket body, the left and right ends of which are vertically bent to form bracket side covers. The bracket side covers are provided with bracket driving holes. The bracket driving holes and the armature driving holes are connected by the rotating shaft. The bracket body is provided with bracket docking holes. The bracket docking holes, the iron core docking holes and the thermal element docking holes are riveted together in sequence.

[0008] The front end of the side cover of the bracket is bent vertically inward to form a bracket limiting foot for limiting the armature when it swings.

[0009] The upper end of the heat element receiving part is provided with a lower spring positioning groove at the heat element clearance hole, the bottom of the armature release locking block is provided with an upper spring positioning groove at the locking block connection hole, and the anti-reverse spring is placed between the lower spring positioning groove and the upper spring positioning groove.

[0010] The upper end of the heat element fixing part is bent and extended to form a heat element external connection part arranged parallel to the heat element fixing part, and the heat element external connection part is provided with a heat element waist-shaped external connection hole.

[0011] The advantages of this utility model of the armature assembly for a molded case circuit breaker are as follows: after the circuit breaker trips, the anti-return spring pushes the armature release lock block back to the blocking position, so that the armature cannot return to its original position if the fault is not eliminated. Even if the operator forcibly pushes the switch handle, it cannot be closed, which fundamentally prevents the circuit breaker from being accidentally closed under potential danger conditions and significantly improves the safety and reliability of the circuit breaker. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a schematic diagram of the armature assembly of the molded case circuit breaker of this utility model; Figure 2 This is a schematic diagram of the structure of the thermal element of the circuit breaker of this utility model; Figure 3 This is a schematic diagram of the armature structure of this utility model; Figure 4 This is a structural schematic diagram of the armature locking assembly of this utility model; Figure 5 This is a schematic diagram of the armature release locking block of this utility model; Figure 6 This is a schematic diagram of the iron core structure of this utility model; Figure 7 This is a structural schematic diagram of the armature bracket of this utility model. Detailed Implementation

[0014] like Figure 1-7 As shown, the armature assembly of the molded case circuit breaker of this utility model includes an armature bracket 1, a circuit breaker thermal element 2, an iron core 3, an armature 4 rotatably mounted on the armature bracket 1 via a rotating shaft 5, and an armature locking assembly 6. The circuit breaker thermal element 2 includes a horizontally arranged thermal element receiving part 10 and a thermal element fixing part 11 vertically arranged at one end of the thermal element receiving part 10. The thermal element receiving part 10 is provided with a thermal element clearance hole 13, and the thermal element fixing part 11... The armature 4 is provided with a heating element docking hole 14; the armature 4 includes an armature magnetic attraction part 16, the upper end of which is bent outward to form an armature release foot 17, and the lower end of which is rotated 180 degrees to form an armature reinforcement part 18 that fits against the outside of the armature magnetic attraction part 16. Armature swing blocks 19 are provided on both sides of the upper end of the armature magnetic attraction part 16, and armature driving holes 20 are provided on the armature swing blocks 19. The armature locking assembly 6 includes components that are connected to the armature... The lower end of the magnetic attraction part 16 is connected to the armature release locking block 22, the anti-return spring 23, and the locking block linkage rod 24. The locking block linkage rod 24 includes a linkage rod body 25. The armature release locking block 22 has a wedge-shaped structure, with the inner side higher than the outer side. The bottom of the armature release locking block 22 is provided with a locking block connecting hole 27. The linkage rod body 25 passes through the heat element clearance hole 13 below the heat element receiving part 10 and is then connected and fixed to the locking block connecting hole 27. The anti-return spring 23 is sleeved. The linkage rod 25 has one end abutting the bottom of the armature tripping block 22 and the other end abutting the thermal element receiving part 10. After the circuit breaker trips, the anti-reverse spring 23 pushes the armature tripping block 22 back to the blocking position, so that the armature 4 cannot return to its original position if the fault is not eliminated. Even if the operator forcibly pushes the switch handle, it cannot be closed, which fundamentally prevents the circuit breaker from being accidentally closed under the condition of potential danger and significantly improves the safety and reliability of the circuit breaker.

[0015] The iron core 3 includes an iron core body 30 attached to the outside of the heating element fixing part 11. The left and right ends of the iron core body 30 are vertically bent to form iron core side parts 31 for strengthening the magnetic field, which effectively increases the magnetic flux density and magnetic field concentration, thereby improving the magnetic force of the armature magnetic attraction part 16. The iron core body 30 is provided with an iron core docking hole 32 corresponding to the heating element docking hole 14.

[0016] The armature bracket 1 includes a bracket body 34, the left and right ends of which are vertically bent to form a bracket side cover 35. The bracket side cover 35 is provided with a bracket driving hole 36. The bracket driving hole 36 and the armature driving hole 20 are connected by the rotating shaft 5. The bracket body 34 is provided with a bracket docking hole 37. The bracket docking hole 37, the iron core docking hole 32 and the heat element docking hole 14 are riveted together in sequence.

[0017] The front end of the bracket side cover 35 is bent vertically inward to form a bracket limiting foot 38 for limiting the armature 4 on the outside when it swings, so as to prevent the armature from excessively swinging due to inertia or vibration, and to ensure accurate motion trajectory and reliable movement.

[0018] The upper end of the heat element receiving part 10 is provided with a lower spring positioning groove 40 at the heat element clearance hole 13, and the bottom of the armature release locking block 22 is provided with an upper spring positioning groove 41 at the locking block connection hole 27. The anti-retraction spring 23 is placed between the lower spring positioning groove 40 and the upper spring positioning groove 41 to ensure that the force direction of the spring is stable during compression and release, and to improve the reliability of locking and resetting actions.

[0019] The upper end of the heat element fixing part 11 is bent and extended to form a heat element external connection part 12 arranged parallel to the heat element fixing part 11, and the heat element external connection part 12 is provided with a heat element waist-shaped external connection hole 15.

[0020] Working process: When a phase of the circuit breaker experiences an overload or short circuit, the armature 4 causes an increase in magnetic force at the core 3. Under the influence of this magnetic imbalance, the corresponding phase's armature 4 swings towards the core. The lower end of the armature reinforcement 18 of the armature 4 moves inward, causing the armature tripping block 22 to press down. Simultaneously, the armature tripping foot 17 directly drives the circuit breaker switching mechanism to operate—the circuit breaker switch is brought to the open position, tripping the circuit breaker and disconnecting the circuit. After the armature reinforcement 18 swings to its position, the anti-return spring 23 causes the armature tripping block 22 to return to its original position, preventing the armature 4 from returning to its original position. Even if the operator attempts to reset the switch (force close) through the circuit breaker panel, the armature 4 cannot return to the closed position due to the mechanical obstruction of the armature tripping block 22. This prevents accidental closing of the circuit breaker before the fault is cleared, thus preventing further damage to the equipment / line. After the fault is cleared, the armature 4 can be unlocked and quickly reset by pulling down the locking block linkage rod 24.

[0021] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model are included within the protection scope of the present utility model.

Claims

1. An armature assembly for a molded case circuit breaker, characterized in that: The circuit breaker includes an armature bracket (1), a circuit breaker thermal element (2), an iron core (3), an armature (4) rotatably mounted on the armature bracket (1) via a rotating shaft (5), and an armature locking assembly (6). The circuit breaker thermal element (2) includes a horizontally arranged thermal element receiving part (10) and a thermal element fixing part (11) vertically arranged at one end of the thermal element receiving part (10). The thermal element receiving part (10) is provided with a thermal element clearance hole (13), and the thermal element fixing part (11) is provided with a thermal element docking hole (14). The armature (4) includes an armature magnetic attraction part (16), the upper end of which is bent outward to form an armature release foot (17), and the lower end of which is rotated 180 degrees to form an armature reinforcement part (18) that fits against the outside of the armature magnetic attraction part (16). Armature swing blocks (19) are provided on both sides of the upper end of the armature magnetic attraction part (16), and armature driving holes (20) are provided on the armature swing blocks (19). The armature locking assembly (6) includes an armature release locking block (22) that is connected to the lower end of the armature magnetic attraction part (16), an anti-reverse spring (23), and a locking block. Linkage rod (24), the locking block linkage rod (24) includes linkage rod body (25), the armature release locking block (22) is a wedge structure, with the inner side higher than the outer side, the bottom of the armature release locking block (22) is provided with a locking block connecting hole (27), the linkage rod body (25) passes through the heat element relief hole (13) from below the heat element receiving part (10) and is connected and fixed to the locking block connecting hole (27), the anti-reverse spring (23) is sleeved on the linkage rod body (25), one end of which abuts against the bottom of the armature release locking block (22) and the other end of which abuts against the heat element receiving part (10).

2. The armature assembly of the molded case circuit breaker according to claim 1, characterized in that: The core (3) includes a core body (30) attached to the outside of the heat element fixing part (11). The left and right ends of the core body (30) are vertically bent to form core side parts (31) for strengthening the magnetic field. The core body (30) is provided with core docking holes (32) corresponding to the heat element docking holes (14).

3. The armature assembly of the molded case circuit breaker according to claim 2, characterized in that: The armature bracket (1) includes a bracket body (34), the left and right ends of the bracket body (34) are bent vertically to form a bracket side cover (35), the bracket side cover (35) is provided with a bracket driving hole (36), the bracket driving hole (36) and the armature driving hole (20) are connected by the rotating shaft (5), the bracket body (34) is provided with a bracket docking hole (37), the bracket docking hole (37), the iron core docking hole (32) and the heat element docking hole (14) are riveted together in sequence.

4. The armature assembly of the molded case circuit breaker according to claim 3, characterized in that: The front end of the bracket side cover (35) is bent vertically inward to form a bracket limiting foot (38) for limiting the armature (4) on the outside when it swings.

5. The armature assembly of the molded case circuit breaker according to claim 1, characterized in that: The upper end of the heat element receiving part (10) is provided with a lower spring positioning groove (40) at the heat element clearance hole (13), and the bottom of the armature release locking block (22) is provided with an upper spring positioning groove (41) at the locking block connection hole (27). The anti-reverse spring (23) is placed between the lower spring positioning groove (40) and the upper spring positioning groove (41).

6. The armature assembly of the molded case circuit breaker according to claim 1, characterized in that: The upper end of the heat element fixing part (11) is bent and extended to form a heat element external connection part (12) arranged parallel to the heat element fixing part (11), and the heat element external connection part (12) is provided with a heat element waist-shaped external connection hole (15).

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