Miniature circuit breaker

Abstract

The invention discloses a miniature 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 further arranged in the shell. The contact support assembly comprises a contact support, one surface of the contact support is provided with a lock catch, and the other surface of the contact support is also provided with a mounting seat and a moving contact; a first torsional spring is arranged in the mounting seat; one end of the first torsion spring is connected with a fixed block arranged in the shell, and the other end of the first torsion spring is fixed on the moving contact; the bimetallic strip is connected with the moving contact through a wire, and the handle is connected with the contact support through an arranged linkage rod. The first torsion spring ensures that the contact support assembly completes the opening and closing actions, and can also simply and conveniently complete the installation of the contact support assembly at the same time. Compared with the prior art, the equipment has the advantages that the mechanism is simple, the number of used parts is small, the uncertainty during part matching is reduced, then industrial batch production is facilitated, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to a miniature circuit breaker. Background Art

[0002] In the prior art, such as the announcement number: CN114914134A, a tension spring is provided between the handle and the contact support to promote the connection between the moving and static contacts. At the same time, the prior art with the announcement number CN114464505A uses a reset spring to promote the connection between the moving and static 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 object of the present invention is to provide a miniature circuit breaker to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a miniature circuit breaker, comprising a housing, a handle mounted on the housing, and a contact support assembly mounted in the housing, wherein a bimetallic strip is further provided in the housing; the contact support assembly comprises a contact bracket, a lock is provided on one side of the contact bracket, and a mounting base and a moving contact are further provided on the other side of the contact bracket; a first torsion spring is provided in the mounting base; wherein one end of the first torsion spring is connected to a fixed block provided in 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 bracket via a linkage rod.

[0005] As a preferred technical solution of the present invention: a first limiting portion is provided on the outer end surface of the mounting seat, and a second limiting portion is also provided on the moving contact; wherein, one end of the first torsion spring passes through the inner surface of the first limiting portion and is connected to the fixed block, and the other end of the first torsion spring is buckled on the second limiting portion.

[0006] As a preferred technical solution of the present invention: a pressing portion is further provided on the outer end surface of the mounting seat, and the first torsion spring is pressed into the mounting seat through the pressing portion.

[0007] As a preferred technical solution of the present invention: an axial pin rod is also provided on the contact bracket; wherein, the axial pin rod and the mounting seat are on the same plane and are located below the mounting seat; a protrusion is also provided below the axial pin rod, and the protrusion is used to prevent the moving contact from rotating along the axial pin rod.

[0008] As a preferred technical solution of the present invention: the contact support is further provided with heat dissipation holes.

[0009] As a preferred technical solution of the present invention: after the lock is installed on the contact bracket, the extension portion provided on the upper end of the lock extends into the slide groove provided on the contact bracket, and the extension portion prevents the linkage rod from passing over the extension portion.

[0010] As a preferred technical solution of the present invention: a support column is further provided on a side of the contact bracket away from the mounting seat, and the lock is rotatably mounted on the support column, and a stop portion provided on the contact bracket is used to prevent the lock from rotating clockwise.

[0011] As a preferred technical solution of the present invention: a second torsion spring is further provided on the outside of the lock, one end of the second torsion spring is buckled on the third limiting portion provided on the contact bracket, and the other end of the second torsion spring is buckled on the fourth limiting portion provided on the lock.

[0012] By adopting the above technical solution, the present invention has the following beneficial effects: since the first torsion spring is provided to ensure that the contact support assembly completes the opening and closing action while simultaneously moving the side of the contact support assembly having the first torsion spring toward the inner wall surface of the housing, after the contact support assembly is installed in the housing, the contact support assembly can be simply and conveniently installed by moving one end of the first torsion spring onto the fixing block. Based on this, compared with the existing technology, the device has a simple structure, uses fewer components, reduces the uncertainty in the matching of parts, and thus facilitates industrial mass production and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the internal structure of the present invention when it is in an open state; Figure 2 This is a schematic diagram of one side of the handle, contact support assembly, and bimetallic strip after being connected; Figure 3 This is a schematic diagram of the other side of the handle, contact support assembly, and bimetallic strip after connection; Figure 4 for Figure 3 A partial enlarged schematic diagram of point A in the middle; Figure 5 Schematic diagram of the exploded structure of the contact support assembly of the present invention; Figure 6 This is a schematic structural diagram of one side of the contact support of the present invention; Figure 7 This is a schematic structural diagram of the other side of the contact support of the present invention.

[0014] In the figure: 1. Shell; 2. Handle; 3. Contact support assembly; 30. Contact bracket; 31. First torsion spring; 32. Lock; 33. Moving contact; 34. Stop portion; 35. Slide groove; 36. Support column; 37. Heat dissipation hole; 38. First limiting portion; 39. Second limiting portion; 310. Mounting seat; 311. Axis pin rod; 312. Protrusion; 313. Pressing portion; 314. Third limiting portion; 315. Second torsion spring; 316. Extension portion; 317. Fourth limiting portion; 4. Linkage rod; 5. Bimetallic strip; 6. Fixing block; 7. Magnetic assembly. DETAILED DESCRIPTION

[0015] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limitations on the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "upper surface", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limitations on the present invention.

[0016] See also Figure 1-7 , an embodiment of the present invention provides: a small circuit breaker, comprising a housing 1, a handle 2 mounted on the housing 1 and a contact support assembly 3 mounted in the housing 1, and a bimetallic strip 5 is further provided in the housing 1; the contact support assembly 3 includes a contact bracket 30, one side of the contact bracket 30 is provided with a lock 32, and the other side of the contact bracket 30 is further provided with a mounting seat 310 and a moving contact 33; a first torsion spring 31 is provided in the mounting seat 310; wherein, one end of the first torsion spring 31 is connected to a fixed block 6 provided in 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 provided. To sum up, since the first torsion spring 31 is provided to ensure that the contact support assembly 3 completes the opening and closing action while moving the side of the contact support assembly 3 having the first torsion spring 31 toward the inner wall surface of the shell 1, when the contact support assembly 3 is installed to the shell 1, one end of the first torsion spring 31 is pulled onto the fixed block 6, the installation of the contact support assembly 3 can be completed simply and conveniently.

[0017] Furthermore, since the outer end surface of the mounting seat 310 is provided with a first limiting portion 38, and the moving contact 33 is also provided with a second limiting portion 39; wherein, one end of the first torsion spring 31 passes through the inner surface of the first limiting portion 38 and is connected to the fixing block 6, and the other end of the first torsion spring 31 is buckled on the second limiting portion 39, based on this, one end of the first torsion spring 31 can be used to fit on the second limiting portion 39 to achieve preliminary fixation of the moving contact 33, thereby preventing the moving contact 33 from falling off when the contact support assembly 3 is assembled.

[0018] Furthermore, since a pressing portion 313 is provided on the outer end surface of the mounting seat 310, and the first torsion spring 31 is pressed into the mounting seat 310 by the pressing portion 313, when the first torsion spring 31 is simultaneously subjected to the forces of the first limiting portion 38, the second limiting portion 39, the fixing block 6, and the pressing portion 313, the first torsion spring 31 can be stably and reliably located in the mounting seat 310. In particular, the pressing portion 313 causes the first torsion spring 31 to move toward the contact bracket 30, thereby enabling 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 achieving the opening and closing action, thereby expanding the comprehensive application capabilities of the first torsion spring 31, making the installation of the moving contact 33 simpler and more convenient, and eliminating the need to use additional methods to fix it.

[0019] In addition, the contact support 30 is also provided with an axis pin 311, which is coplanar with the mounting base 310 and located below the mounting base 310. A protrusion 312 is also provided below the axis pin 311, which prevents the movable contact 33 from rotating along the axis pin 311. Therefore, the axis pin 311 is used to relatively fix one end of the movable contact 33. At this time, the first torsion spring 31 forces one side of the movable contact 33 to fit against the protrusion 312, further ensuring the stability and reliability of the movable contact 33 after installation. Therefore, the movable contact 33 can be reliably installed by simply ensuring that the first torsion spring 31 is properly installed, thereby making assembly of the contact support 30 and the movable contact 33 simpler and more convenient.

[0020] At the same time, since the contact bracket 30 is also provided with a heat dissipation hole 37, the heat generated by the moving contact 33 can be quickly discharged through the heat dissipation hole 37, which can ensure the reliable operation of the moving contact 33 while reducing the adverse effects of heat on the contact bracket 30.

[0021] Furthermore, because the movable contact 33 and the contact holder 30 are easily and conveniently assembled, the bimetallic strip 5 can be integrated with the movable contact 33. Specifically, prior to assembly, the wires are welded to the bimetallic strip 5 and the movable contact 33, and then the movable contact 33 is mounted on the contact holder 30. This facilitates the integrated production and processing of the movable contact 33 and the bimetallic strip 5. Specifically, the movable contact 33 is placed on the contact holder 30, and one end of the first torsion spring 31 is clipped onto the contact holder 30 and then connected to the fixing block 6 within the housing 1. The other end of the first torsion spring 31 is fixed to the movable contact 33. Specifically, the movable contact 33, the first torsion spring 31, and the contact holder 30 can be assembled first, and then assembled with the bimetallic strip 5. This facilitates the industrial production of the thermal assembly, allowing it to be completely assembled into the housing 1. Consequently, compared to existing technologies, the device boasts a simpler structure and fewer components, reducing uncertainty in component assembly, thereby facilitating industrial mass production and improving production efficiency.

[0022] Based on the above solution, after the lock catch 32 is mounted on the contact bracket 30, the extension portion 316 provided on the upper end of the lock catch 32 extends into the slide groove 35 provided on the contact bracket 30, and the extension portion 316 prevents the linkage rod 4 from passing over the extension portion 316. Therefore, when the linkage rod 4 follows the linkage of the handle 2, the lock catch 32 can reliably ensure the synchronous linkage with the contact bracket 30.

[0023] Furthermore, a support post 36 is provided on a side of the contact support 30 away from the mounting base 310, and the latch 32 is rotatably mounted on the support post 36. A stopper 34 provided on the contact support 30 prevents the latch 32 from rotating clockwise. The stopper 34 prevents the latch 32 from rotating unrestricted along the support post 36, thereby ensuring reliable linkage between the latch 32 and the contact support 30.

[0024] Furthermore, a second torsion spring 315 is provided on the exterior of the lock catch 32. One end of the second torsion spring 315 engages with the third stopper 314 on the contact support 30, and the other end engages with the fourth stopper 317 on the lock catch 32. Therefore, the second torsion spring 315 ensures that the lock catch 32 remains in contact with the stopper 34, preventing the lock catch 32 from rotating counterclockwise. After the switch is opened, if the handle 2 is not fully rotated, the second torsion spring 315 can still drive the handle to rotate clockwise. The user needs to continue to move the handle 2 toward the closed position to complete the closing operation.

[0025] To sum up, the lock catch 32 returns to its original position under the action of the reset spring force, and the lock catch 32 is prevented from "running away" under the action of the contact bracket 30 and the stop portion 34; under the limitation of the lock catch 32 and the contact bracket 30, the U-shaped lock catch 32 is positioned at the set position on the contact bracket 30, and at this time the contact support assembly 3 can be driven to move by the handle 2.

[0026] In addition, a magnetic assembly 7 is provided inside the shell, wherein the magnetic assembly 7 is assembled into a component by automatic lines such as spot welding and riveting, so as to facilitate automatic assembly by a robot.

[0027] At the same time, the wires between the bimetallic strip on the contact support assembly 3 and the moving contact 33 are also spot-welded or other means to form a component, and then the moving contact 33 is combined with the contact bracket 30 to form a contact support 3. At this time, the contact support assembly 3 can be automatically assembled into the housing 1 by a robot.

[0028] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A miniature circuit breaker, characterized in that: It comprises a housing (1), a handle (2) mounted on the housing (1), and a contact support assembly (3) mounted in the housing (1), and a bimetallic strip (5) is further provided in the housing (1); The contact support assembly (3) includes a contact bracket (30), one side of the contact bracket (30) is provided with a lock (32), and the other side of the contact bracket (30) is also provided with a mounting seat (310) and a moving contact (33); A first torsion spring (31) is provided in the mounting seat (310); 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 to 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 bracket (30) via a provided linkage rod (4).

2. A miniature circuit breaker according to claim 1, characterized in that: The outer end surface of the mounting seat (310) is provided with a first limiting portion (38), and the moving contact (33) is also provided with a second limiting portion (39); wherein, one end of the first torsion spring (31) passes through the inner surface of the first limiting portion (38) and is connected to the fixing block (6), and the other end of the first torsion spring (31) is buckled on the second limiting portion (39).

3. A miniature circuit breaker according to claim 2, characterized in that: A pressing portion (313) is also provided on the outer end surface of the mounting seat (310), and the first torsion spring (31) is pressed into the mounting seat (310) through the pressing portion (313).

4. A miniature circuit breaker according to claim 3, characterized in that: The contact support (30) is further provided with an axis pin rod (311); wherein the axis pin rod (311) and the mounting seat (310) are on the same plane and are located below the mounting seat (310); a protrusion (312) is further provided below the axis pin rod (311), and the protrusion (312) is used to prevent the moving contact (33) from rotating along the axis pin rod (311).

5. A miniature circuit breaker according to claim 4, characterized in that: The contact support (30) is also provided with a heat dissipation hole (37).

6. A miniature circuit breaker according to any one of claims 1 to 5, characterized in that: After the lock catch (32) is mounted on the contact bracket (30), the extension portion (316) provided on the upper end of the lock catch (32) extends into the slide groove (35) provided on the contact bracket (30), and the extension portion (316) prevents the linkage rod (4) from passing over the extension portion (316).

7. A miniature circuit breaker according to claim 6, characterized in that: A support column (36) is further provided on a side of the contact bracket (30) away from the mounting seat (310), and the lock catch (32) is rotatably mounted on the support column (36), and a stopper (34) provided on the contact bracket (30) is used to prevent the lock catch (32) from rotating clockwise.

8. A miniature circuit breaker according to claim 7, characterized in that: A second torsion spring (315) is further provided on the outside of the lock catch (32), one end of the second torsion spring (315) is buckled on a third limiting portion (314) provided on the contact bracket (30), and the other end of the second torsion spring (315) is buckled on a fourth limiting portion (317) provided on the lock catch (32).

Images