A miniature circuit breaker

Abstract

The application discloses a small circuit breaker, which comprises a shell, a handle installed on the shell and a contact support assembly installed in the shell, and a bimetallic strip is arranged in the shell; the contact support assembly comprises a contact support, one side of the contact support is provided with a lock catch, and the other side of the contact support is further provided with a mounting seat and a movable contact; a first torsional spring is arranged in the mounting seat; one end of the first torsional spring is connected with a fixing block arranged in the shell, and the other end of the first torsional spring is fixed on the movable contact; the bimetallic strip is connected with the movable contact through a wire, and the handle is connected with the contact support through a linkage rod; the first torsional spring can simply and conveniently complete the installation of the contact support assembly while guaranteeing the contact support assembly to complete the opening and closing action. Compared with the prior art, the equipment has the advantages of simple mechanism, fewer components, reduced uncertainty of component cooperation, facilitated industrialized batch production and improved production efficiency.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, specifically to a miniature circuit breaker. Background Technology

[0002] In the prior art, such as the one with announcement number CN114914134A, the handle and the contact support are connected by a tension spring. Meanwhile, the prior art with announcement number CN114464505A uses a return spring to connect the moving and stationary contacts. It is not difficult to see that the structure of the contact support assembly in the prior art is relatively complex and has a large number of parts, which is not conducive to production and assembly and affects the efficiency of industrial production. Summary of the Invention

[0003] The purpose of this invention is to provide a miniature circuit breaker to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a miniature circuit breaker, comprising a housing, a handle mounted on the housing, and a contact support assembly mounted within the housing, wherein a bimetallic strip is also provided within the housing; the contact support assembly includes a contact bracket, one side of which is provided with a latch, and the other side of which is provided with a mounting base and a moving contact; a first torsion spring is provided within the mounting base; wherein one end of the first torsion spring is connected to a fixing block provided within the housing, and the other end of the first torsion spring is fixed to the moving contact; the bimetallic strip is connected to the moving contact via a wire, and the handle is connected to the contact via a linkage rod. The bracket is connected; the outer end face of the mounting base is provided with a first limiting part, and the moving contact is also provided with a second limiting part; wherein, one end of the first torsion spring passes through the inner surface of the first limiting part and is connected to the fixing block, and the other end of the first torsion spring is fastened to the second limiting part; the outer end face of the mounting base is also provided with a pressing part, and the first torsion spring is pressed into the mounting base by the pressing part; the contact bracket is also provided with a shaft pin; wherein, the shaft pin is on the same surface as the mounting base and is located below the mounting base; a protrusion is also provided below the shaft pin, and the protrusion is used to prevent the moving contact from rotating along the shaft pin.

[0005] As a preferred embodiment of the present invention, the contact support is further provided with heat dissipation holes.

[0006] As a preferred technical solution of the present invention: after the latch is installed on the contact bracket, the extension portion provided at the upper end of the latch extends into the sliding groove provided on the contact bracket, and the linkage rod is prevented from passing through the extension portion by the extension portion.

[0007] As a preferred technical solution of the present invention: the side of the contact bracket away from the mounting base is also provided with a support column, and the latch is rotatably mounted on the support column, and the latch is prevented from rotating clockwise by a stop part provided on the contact bracket.

[0008] As a preferred technical solution of the present invention: a second torsion spring is provided on the outside of the latch, one end of the second torsion spring is fastened to the third limiting part provided on the contact bracket, and the other end of the second torsion spring is fastened to the fourth limiting part provided on the latch.

[0009] The beneficial effects of adopting the above technical solution are as follows: Because the first torsion spring is positioned to ensure that the contact support assembly completes its opening and closing action while simultaneously moving the side of the contact support assembly with the first torsion spring towards the inner wall of the housing, after the contact support assembly is installed into the housing, one end of the first torsion spring is moved onto the fixing block, thus easily and conveniently completing the installation of the contact support assembly. Based on this, compared with the prior art, this device has a simpler mechanism, fewer components, reduces uncertainty in component assembly, and thus facilitates industrial mass production and improves production efficiency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the internal structure of the present invention when it is in the open state;

[0011] Figure 2 This is a schematic diagram of one side of the handle, contact support assembly, and bimetallic strip of the present invention after they are connected.

[0012] Figure 3 This is a schematic diagram of the other side after the handle, contact support assembly, and bimetallic strip of the present invention are connected.

[0013] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0014] Figure 5 This is an exploded structural diagram of the contact support assembly of the present invention;

[0015] Figure 6 This is a schematic diagram of one side of the contact support structure of the present invention;

[0016] Figure 7 This is a schematic diagram of the other side of the contact support structure of the present invention.

[0017] In the diagram: 1. Housing; 2. Handle; 3. Contact support assembly; 30. Contact bracket; 31. First torsion spring; 32. Lock; 33. Moving contact; 34. Stop part; 35. Slide groove; 36. Support column; 37. Heat dissipation hole; 38. First limiting part; 39. Second limiting part; 310. Mounting base; 311. Shaft pin; 312. Protrusion; 313. Pressing part; 314. Third limiting part; 315. Second torsion spring; 316. Extension part; 317. Fourth limiting part; 4. Linkage rod; 5. Bimetallic strip; 6. Fixing block; 7. Magnetic assembly. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "upper surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore should not be construed as limiting the present invention.

[0019] Please see Figure 1-7 The present invention provides an embodiment of a miniature circuit breaker, comprising a housing 1, a handle 2 mounted on the housing 1, and a contact support assembly 3 mounted inside the housing 1, wherein a bimetallic strip 5 is also provided inside the housing 1; the contact support assembly 3 includes a contact bracket 30, one side of which is provided with a latch 32, and the other side of which is provided with a mounting base 310 and a moving contact 33; a first torsion spring 31 is provided inside the mounting base 310; wherein one end of the first torsion spring 31 is connected to a fixing block 6 provided inside the housing 1, and the other end of the first torsion spring 31 is fixed to the moving contact 33; the bimetallic strip 5 is connected to the moving contact 33 through a wire, and the handle 2 is connected to the contact bracket 30 through a linkage rod 4.

[0020] In summary, since the first torsion spring 31 is installed to ensure that the contact support assembly 3 completes the opening and closing action, the side of the contact support assembly 3 with the first torsion spring 31 moves towards the inner wall of the housing 1. After the contact support assembly 3 is installed on the housing 1, one end of the first torsion spring 31 can be moved to the fixing block 6, and the installation of the contact support assembly 3 can be completed simply and conveniently.

[0021] Furthermore, since the outer end face of the mounting base 310 is provided with a first limiting part 38, and the moving contact 33 is also provided with a second limiting part 39; wherein, one end of the first torsion spring 31 passes through the inner surface of the first limiting part 38 and is connected to the fixing block 6, and the other end of the first torsion spring 31 is fastened to the second limiting part 39, based on this, one end of the first torsion spring 31 can be attached to the second limiting part 39 to achieve preliminary fixation of the moving contact 33, thereby preventing the moving contact 33 from falling off during the assembly of the contact support assembly 3.

[0022] Furthermore, since a clamping part 313 is provided on the outer end face of the mounting base 310, the first torsion spring 31 is pressed into the mounting base 310 by the clamping part 313. Therefore, when the first torsion spring 31 is simultaneously subjected to the forces of the first limiting part 38, the second limiting part 39, the fixing block 6, and the clamping part 313, the first torsion spring 31 can be stably and reliably located within the mounting base 310. In particular, the clamping part 313 causes the first torsion spring 31 to move towards the contact bracket 30, thereby allowing the first torsion spring 31 to reliably press the moving contact 33 onto the contact bracket 30, further ensuring the stability of the moving contact 33 after installation. Based on this, the first torsion spring 31 can fix the moving contact 33 while performing the opening and closing action, thus expanding the comprehensive application capability of the first torsion spring 31. Therefore, the installation of the moving contact 33 is simpler and more convenient, without the need for additional methods to fix it.

[0023] Furthermore, the contact support 30 is also equipped with a pivot pin 311; the pivot pin 311 is on the same surface as the mounting base 310 and is located below the mounting base 310; a protrusion 312 is also provided below the pivot pin 311, and the protrusion 312 prevents the moving contact 33 from rotating along the pivot pin 311. Therefore, by using the pivot pin 311 to fix one end of the moving contact 33 relatively, the first torsion spring 31 causes one side of the moving contact 33 to fit against the protrusion 312, thereby further ensuring the stability and reliability of the moving contact 33 after installation. Based on this, it is only necessary to ensure that the first torsion spring 31 is installed in place to achieve reliable installation of the moving contact 33, thus making the assembly of the contact support 30 and the moving contact 33 simpler and more convenient.

[0024] Meanwhile, since the contact support 30 is also provided with heat dissipation holes 37, the heat generated by the moving contact 33 can be quickly dissipated through the heat dissipation holes 37. This ensures the reliable operation of the moving contact 33 while reducing the adverse effects of heat on the contact support 30.

[0025] Furthermore, since the installation of the moving contact 33 and the contact support 30 is simple and convenient, the bimetallic strip 5 can be integrated with the moving contact 33. That is, before assembly, the wire is soldered to the bimetallic strip 5 and the moving contact 33, and then the moving contact 33 is installed onto the contact support 30. Based on this, it is also convenient for the integrated production and processing of the moving contact 33 and the bimetallic strip 5. Specifically, the moving contact 33 is placed in the contact support 30, and then one end of the first torsion spring 31 is clamped onto the contact support 30 and connected to the fixing block 6 inside the housing 1. The other end of the first torsion spring 31 is fixed to the moving contact 33. Specifically, the moving contact 33, the first torsion spring 31 and the contact support 30 can be combined first, and then combined with the bimetallic strip 5. This is conducive to the industrial production of the thermal assembly being installed as a whole into the housing 1. Based on this, compared with the prior art, this equipment has a simple structure, fewer parts, reduces the uncertainty of parts matching, and thus facilitates industrial mass production and improves production efficiency.

[0026] Based on the above solution, after the latch 32 is installed on the contact bracket 30, the extension 316 at the upper end of the latch 32 extends into the sliding groove 35 on the contact bracket 30, and prevents the linkage rod 4 from passing through the extension 316. Therefore, when the linkage rod 4 moves in conjunction with the handle 2, it can reliably ensure the synchronous linkage between the latch 32 and the contact bracket 30.

[0027] Furthermore, the contact bracket 30 has a support column 36 on the side away from the mounting base 310, and the latch 32 is rotatably mounted on the support column 36. A stop portion 34 on the contact bracket 30 prevents the latch 32 from rotating clockwise. Due to the stop portion 34, the latch 32 will not rotate unrestricted along the support column 36, ensuring reliable linkage between the latch 32 and the contact bracket 30.

[0028] Meanwhile, a second torsion spring 315 is also provided on the outside of the latch 32. One end of the second torsion spring 315 is fastened to the third limiting part 314 provided on the contact bracket 30, and the other end of the second torsion spring 315 is fastened to the fourth limiting part 317 provided on the latch 32. Therefore, the second torsion spring 315 can be used to keep the latch 32 against the stop part 34 to prevent the latch 32 from rotating counterclockwise. When the circuit is open, if the handle 2 is not rotated to the correct position, the second torsion spring 315 can also drive the handle to rotate clockwise. The user needs to continue to move the handle 2 towards the closing position to complete the closing action.

[0029] In summary, the latch 32 returns to its original position under the force of the reset spring, and under the action of the contact bracket 30 and the stop part 34, the latch 32 is prevented from "running over"; under the limit of the latch 32 and the contact bracket 30, the U-shaped latch 32 is positioned on the contact bracket 30 at the set position, and at this time the handle 2 can drive the contact support assembly 3 to move.

[0030] In addition, the interior of the housing is equipped with a magnetic component 7, which is assembled into a part by an automated line for spot welding, riveting and other processes, so that it can be automatically assembled by a robotic arm.

[0031] At the same time, the wires between the bimetallic strip on the contact support assembly 3 and the moving contact 33 are also made into a component by means of spot welding, etc. Then, the moving contact 33 is combined with the contact bracket 30 to form a contact support assembly 3. At this time, the contact support assembly 3 can be automatically assembled into the housing 1 by a robot.

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A miniature circuit breaker, characterized in that: Includes a housing (1), a handle (2) mounted on the housing (1) and a contact support assembly (3) mounted inside the housing (1), and the housing (1) is also provided with a bimetallic strip (5). The contact support assembly (3) includes a contact bracket (30), one side of which is provided with a latch (32), and the other side of which is provided with a mounting base (310) and a moving contact (33). The mounting base (310) is provided with a first torsion spring (31); wherein, one end of the first torsion spring (31) is connected to a fixing block (6) provided in the housing (1), and the other end of the first torsion spring (31) is fixed on the moving contact (33); The bimetallic strip (5) is connected to the moving contact (33) via a wire, and the handle (2) is connected to the contact support (30) via a linkage rod (4); The outer end face of the mounting base (310) is provided with a first limiting part (38), and the moving contact (33) is also provided with a second limiting part (39); wherein, one end of the first torsion spring (31) passes through the inner surface of the first limiting part (38) and is connected to the fixing block (6), and the other end of the first torsion spring (31) is fastened to the second limiting part (39); The mounting base (310) is also provided with a pressing part (313) on its outer end face, and the first torsion spring (31) is pressed into the mounting base (310) by the pressing part (313); The contact bracket (30) is also provided with a shaft pin (311); wherein the shaft pin (311) is on the same surface as the mounting base (310) and is located below the mounting base (310); The lower part of the pivot pin (311) is also provided with a protrusion (312), and the protrusion (312) is used to prevent the moving contact (33) from rotating along the pivot pin (311).

2. The miniature circuit breaker according to claim 1, characterized in that: The contact support (30) is also provided with heat dissipation holes (37).

3. A miniature circuit breaker according to claim 2, characterized in that: After the latch (32) is installed on the contact bracket (30), the extension (316) provided at the upper end of the latch (32) extends into the sliding groove (35) provided on the contact bracket (30), and prevents the linkage rod (4) from passing through the extension (316) through the extension (316).

4. A miniature circuit breaker according to claim 3, characterized in that: The contact bracket (30) is provided with a support column (36) on the side away from the mounting base (310), and the latch (32) is rotatably mounted on the support column (36), and the latch (32) is prevented from rotating clockwise by a stop part (34) provided on the contact bracket (30).

5. A miniature circuit breaker according to claim 4, characterized in that: The latch (32) is further provided with a second torsion spring (315). One end of the second torsion spring (315) is fastened to the third limiting part (314) provided on the contact bracket (30), and the other end of the second torsion spring (315) is fastened to the fourth limiting part (317) provided on the latch (32).

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