A circuit breaker trip mechanism and a miniature circuit breaker

Abstract

The utility model discloses a circuit breaker tripping mechanism and small -size circuit breaker of simple structure, small and good working stability that occupy space. Adopted technical scheme includes: lock catch, contact support, movable contact, first torsional spring, second torsional spring, U -shaped connecting rod and handle, the lock catch upper end is equipped with the sliding slot and the connecting rod positioning groove of smooth transition with sliding slot, the inside of lower end is equipped with the tripping surface, contact support is through the first connecting axle setting in the lock catch upper, contact support lower end outside is equipped with movable contact installation slot, top inside is equipped with the connecting rod positioning step cooperation with connecting rod positioning groove, movable contact is through the second connecting axle setting in movable contact installation slot of contact support.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breakers, and in particular relates to a miniature circuit breaker. Background Technology

[0002] A miniature circuit breaker, also known as a micro circuit breaker, is an electrical device used to protect circuits. The tripping mechanism of a traditional miniature circuit breaker includes a bracket, a trip lever and a latch mounted on the bracket. The trip lever is connected to a handle via a connecting rod. The lower end of the bracket is connected to the moving contact. A first torsion spring is located at the hinge of the trip lever. The first lever arm at the upper end of the first torsion spring acts on the upper end of the trip lever, and the second lever arm at the lower end of the first torsion spring acts on the bracket. A second torsion spring is located at the hinge of the latch. The third lever arm at the lower end of the second torsion spring acts on the lower end of the latch, and the fourth lever arm at the upper end of the second torsion spring acts on the bracket. Traditional tripping mechanisms are relatively complex and have disadvantages such as large space requirements and poor operational stability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a circuit breaker tripping mechanism and a miniature circuit breaker with a simplified structure, small footprint, and good operational stability.

[0004] To solve the above problems, the technical solution adopted by this utility model includes: a latch, a contact bracket, a moving contact, a first torsion spring, a second torsion spring, a U-shaped connecting rod, and a handle; the upper end of the latch is provided with a sliding groove and a connecting rod positioning groove that smoothly transitions with the sliding groove, and the inner side of the lower end is provided with a release surface; the contact bracket is set on the latch through a first connecting shaft in the middle, the outer side of the lower end of the contact bracket is provided with a moving contact mounting groove, and the inner side of the top is provided with a connecting rod positioning step that cooperates with the connecting rod positioning groove; the moving contact is set in the moving contact mounting groove of the contact bracket through a second connecting shaft; the first torsion spring is installed on a first mounting post in the middle of the contact bracket, the first upper force arm of the first torsion spring applies pressure to the upper end of the contact bracket, and the first lower force arm applies pressure to the upper end of the moving contact; the second torsion spring is installed between the latch and the contact bracket for resetting the latch; one end of the U-shaped connecting rod is connected to the handle, and the other end is set between the connecting rod positioning groove and the connecting rod positioning step.

[0005] The rear end of the moving contact is formed by bending to form a spring positioning post, and the spring positioning post is provided with a first spring positioning groove, and the first lower force arm of the first torsion spring is limited within the first spring positioning groove.

[0006] The top of the latch has an integrally formed opening and closing indicator.

[0007] The second torsion spring is sleeved on the second mounting post at the upper end of the latch, and the upper part of its second lever arm abuts against the upper and lower ends of the bushing in the middle of the latch abuts against the second connecting shaft.

[0008] The lower end of the latch is provided with a positioning groove, and the lower end of the contact bracket is provided with a positioning protrusion that is embedded in the positioning groove.

[0009] The upper end of the contact support is provided with a second spring positioning groove, and the first upper lever arm of the first torsion spring is limited within the second spring positioning groove.

[0010] A miniature circuit breaker includes a housing and an electromagnetic trip unit disposed within the housing. The housing is equipped with the circuit breaker tripping mechanism described above, which cooperates with the electromagnetic trip unit.

[0011] The advantages of the circuit breaker tripping mechanism and miniature circuit breaker of this utility model are as follows: The tripping mechanism, through the cooperation between the latch, contact bracket, first torsion spring and second torsion spring, achieves the separation of the moving contact and the stationary contact through linkage when the latch is pushed by the electromagnetic tripping device. This not only simplifies the parts and assembly of the tripping mechanism, but also improves the working stability.

[0012] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a front structural schematic diagram of the circuit breaker tripping mechanism of this utility model; Figure 2 This is a schematic diagram of the back structure of the circuit breaker tripping mechanism of this utility model; Figure 3 This is an exploded view of the circuit breaker tripping mechanism of this utility model; Figure 4 This is a schematic diagram of the contact support structure of this utility model; Figure 5 This is a schematic diagram of the structure of the latch of this utility model; Figure 6 This is a schematic diagram of the structure of the moving contact of this utility model; Figure 7 This is a structural schematic diagram of the miniature circuit breaker of this utility model. Detailed Implementation Example 1:

[0014] Reference Figure 1-6As shown, the circuit breaker tripping mechanism of this utility model includes a latch 1, a contact bracket 2, a moving contact 3, a first torsion spring 4, a second torsion spring 5, a U-shaped connecting rod 6, and a handle 7. The latch 1 has a sliding groove 8 at its upper end and a connecting rod positioning groove 9 that smoothly transitions to the sliding groove 8. The latch 1 has a tripping surface 10 on its lower inner side. When the moving iron core of the electromagnetic trip unit extends, it pushes against the tripping surface 10. The contact bracket 2 is mounted on the latch 1 via a first connecting shaft 11 in the middle. The contact bracket 2 has a moving contact mounting groove 12 on its lower outer side and a connecting rod positioning step 13 on its top inner side that mates with the connecting rod positioning groove 9. The moving contact 3 is mounted in the moving contact mounting groove 12 of the contact bracket 2 via a second connecting shaft 14 to ensure the stability of the moving contact 3 after assembly. The first torsion spring 4 is mounted on the first mounting post 15 in the middle of the contact bracket 2. The first upper force arm 16 of the first torsion spring 4 applies pressure to the upper end of the contact bracket 2, and the first lower force arm 17 of the first torsion spring 4 applies pressure to the upper end of the moving contact 3. Under the action of the first torsion spring 4, the moving contact 3 rotates towards the electromagnetic trip unit. When the circuit is closed, the moving contact 3 can fit more tightly against the stationary contact of the electromagnetic trip unit. The second torsion spring 5 is installed between the latch 1 and the contact bracket 2 for resetting the latch 1. One end of the U-shaped connecting rod 6 is connected to the handle 7, and the other end of the U-shaped connecting rod 6 is disposed between the connecting rod positioning groove 9 and the connecting rod positioning step 13.

[0015] Preferably, the rear end of the moving contact 3 is formed by bending to form a spring positioning post 18. The spring positioning post 18 is provided with a first spring positioning groove 19, and the first lower force arm 17 of the first torsion spring 4 is limited within the first spring positioning groove 19. The upper end of the contact support 2 is provided with a second spring positioning groove 25, and the first upper force arm 16 of the first torsion spring 4 is limited within the second spring positioning groove 25. Through the joint positioning of the first spring positioning groove 19 and the second spring positioning groove 25, the first torsion spring 4 can be more stably assembled on the contact support 2, preventing it from falling off.

[0016] Preferably, the top of the latch 1 is integrally formed with an open / close indicator 20. The surface of the open / close indicator 20 is typically decorated with red and green colors. Red indicates the closed state, while green indicates the open state, for the user's convenience.

[0017] Preferably, the second torsion spring 5 is sleeved on the second mounting post 21 at the upper end of the latch 1, with the upper part of its second lever arm 22 abutting against the bushing 29 in the middle of the latch 1, and the lower end of the second lever arm 22 abutting against the second connecting shaft 14. The second torsion spring 5, with the above-described structure, has the advantages of good stability and convenient assembly.

[0018] Preferably, the lower end of the latch 1 is provided with a positioning groove 23, and the lower end of the contact bracket 2 is provided with a positioning protrusion 24 that is embedded in the positioning groove 23. This further improves the stability of the assembly between the latch 1 and the contact bracket 2, while reducing the size. Example 2:

[0019] Reference Figure 7 As shown, the miniature circuit breaker of this utility model includes a housing 27 and an electromagnetic trip unit 28 disposed within the housing 27. The circuit breaker tripping mechanism a described in Embodiment 1 is disposed within the housing 27 and cooperates with the electromagnetic trip unit 28. After assembly, the two ends of the first connecting shaft 11 are connected to the housing 27. The tripping surface 10 is located in front of the moving iron core of the electromagnetic trip unit.

[0020] Working principle: When manually closing the circuit breaker, press the handle 7. Figure 7 The clockwise rotation shown pushes the U-shaped connecting rod 6, and the end of the U-shaped connecting rod 6, limited by the connecting rod positioning groove 9 and the connecting rod positioning step 13, can synchronously push the contact bracket 2 and the moving contact 3 to rotate, so that the moving contact 3 is in contact with the stationary contact of the electromagnetic trip unit. When the trip is automatic, the moving iron core of the electromagnetic trip unit pushes against the tripping surface 10 of the latch 1, the latch 1 is activated, the original closed position (formed between the connecting rod positioning groove 9 and the connecting rod positioning step 13) is released, the U-shaped connecting rod 6 disengages from the closed position and enters the sliding groove 8 of the latch 1, which can move the moving contact 3 away from the stationary contact of the electromagnetic trip unit (i.e., the open state), and at the same time the handle 7 and the contact bracket 2 are reset.

[0021] The foregoing is not intended to limit the present invention in any way. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A circuit breaker tripping mechanism, characterized in that: The device includes a latch (1), a contact bracket (2), a moving contact (3), a first torsion spring (4), a second torsion spring (5), a U-shaped connecting rod (6), and a handle (7); the latch (1) has a sliding groove (8) at its upper end and a connecting rod positioning groove (9) that smoothly transitions with the sliding groove (8), and a release surface (10) on its lower inner side; the contact bracket (2) is mounted on the latch (1) via a first connecting shaft (11) in the middle, and the contact bracket (2) has a moving contact mounting groove (12) on its lower outer side and a connecting rod positioning step (13) on its top inner side that cooperates with the connecting rod positioning groove (9); the moving contact (3) is mounted on the latch (14) via a second connecting shaft (15). The first torsion spring (4) is installed on the first mounting post (15) in the middle of the contact bracket (2). The first upper force arm (16) of the first torsion spring (4) applies pressure to the upper end of the contact bracket (2) and the first lower force arm (17) applies pressure to the upper end of the moving contact (3). The second torsion spring (5) is installed between the latch (1) and the contact bracket (2) for resetting the latch (1). One end of the U-shaped connecting rod (6) is connected to the handle (7) and the other end is located between the connecting rod positioning groove (9) and the connecting rod positioning step (13).

2. The circuit breaker tripping mechanism according to claim 1, characterized in that: The rear end of the moving contact (3) is formed by bending to form a spring positioning post (18), and the spring positioning post (18) is provided with a first spring positioning groove (19), and the first lower force arm (17) of the first torsion spring (4) is limited in the first spring positioning groove (19).

3. The circuit breaker tripping mechanism according to claim 1, characterized in that: The latch (1) has an integrally formed opening and closing indicator (20) on its top.

4. The circuit breaker tripping mechanism according to claim 1, characterized in that: The second torsion spring (5) is sleeved on the second mounting post (21) at the upper end of the latch (1), and the upper part of its second lever arm (22) abuts against the upper and lower ends of the bushing (29) in the middle of the latch (1) and abuts against the second connecting shaft (14).

5. The circuit breaker tripping mechanism according to claim 1, characterized in that: The lower end of the latch (1) is provided with a positioning groove (23), and the lower end of the contact bracket (2) is provided with a positioning protrusion (24) embedded in the positioning groove (23).

6. The circuit breaker tripping mechanism according to claim 2, characterized in that: The upper end of the contact bracket (2) is provided with a second spring positioning groove (25), and the first upper lever arm (16) of the first torsion spring (4) is limited in the second spring positioning groove (25).

7. A miniature circuit breaker, comprising a housing (27) and an electromagnetic trip unit (28) disposed within the housing (27), characterized in that: The housing (27) is provided with a circuit breaker tripping mechanism (a) as described in any one of claims 1-6, which cooperates with the electromagnetic tripping device (28).

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