Miniature circuit breaker
A simplified operation mechanism and leak detection system for small circuit breakers using a jump lever and twist spring reduce complexity and costs while ensuring effective operation and detection.
Patent Information
- Application Number
- CN202422335918.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-24
AI Technical Summary
The operating mechanism of existing small circuit breakers is complex and has a large number of parts, resulting in high production costs.
A simplified operating mechanism is adopted, including a handle, connecting rod, contact bracket and jump buckle, which eliminates the locking and tripping of jump buckles by using the elastic force of the third torsion spring. Combined with the leakage test assembly, the reset and conduction of the leakage test button is driven by the second torsion spring, reducing the number of parts.
It realizes simple structure and fast assembly, reduces production costs, and ensures the normal operation and leakage testing functions of the circuit breaker.
Smart Images
Figure CN223108813U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of low-voltage electrical appliances, and particularly relates to a miniature circuit breaker. Background Art
[0002] A miniature circuit breaker refers to a protective electrical appliance installed on the terminal distribution line, mainly used for overload and short-circuit protection of the line.
[0003] The operating mechanism of the existing miniature circuit breaker includes a handle, a connecting rod, a contact support, a tripping latch and a locking latch. The handle is rotatably installed on the circuit breaker housing. One end of the connecting rod is connected to the handle, and the other end is connected to the locking latch. Both the locking latch and the tripping latch are installed on the contact support. The locking latch is provided with a second lock tooth that cooperates with the first lock tooth of the tripping latch. A moving contact is also fixedly installed on the contact support. During closing, the handle drives the locking latch to rotate through the connecting rod. The second lock tooth of the locking latch abuts against the first lock tooth of the tripping latch, thereby driving the contact support to rotate, so that the moving contact contacts and communicates with the static contact. The above operating mechanism has a large number of components and a relatively complex structure, increasing the production cost. Summary of the Utility Model
[0004] Therefore, the technical problem to be solved by the present utility model is to overcome the defects of the complex structure and high production cost of the operating mechanism in the prior art, so as to provide a miniature circuit breaker with a simple structure and low production cost.
[0005] To this end, the present utility model provides a miniature circuit breaker, including a contact mechanism and an operating mechanism. The contact mechanism includes a moving contact and a static contact. The operating mechanism includes a handle, a connecting rod, a contact support and a tripping latch. The handle is rotatably installed on the circuit breaker housing; the connecting rod has a first rod portion connected to the handle and a second rod portion connected to the contact support; the contact support is rotatably installed on the circuit breaker housing through a second shaft. The contact support is provided with a first lock block that can abut against the second rod portion. The moving contact is installed on the contact support; the tripping latch is rotatably installed on the contact support through a third shaft. The third shaft and the second shaft are not coaxially arranged. The tripping latch has a second lock block corresponding to the first lock block. A locking opening is formed between the second lock block and the first lock block. A third torsion spring is arranged between the tripping latch and the contact support. The tripping latch has an initial position corresponding to the normal operation of the circuit breaker and a tripping position corresponding to the tripping of the circuit breaker when a fault occurs. Wherein, in the initial position, under the elastic action of the third torsion spring, the second lock block abuts against the first lock block, and the second rod portion abuts against the locking opening; in the tripping position, the second lock block is separated from the first lock block, the opening of the locking opening becomes larger, and the second rod portion moves out of the locking opening.
[0006] The circuit breaker housing is provided with a circuit board, a conductive plate and a leakage test assembly. The conductive plate is connected to the circuit board through a first wire. The leakage test assembly includes: a leakage test button movably mounted on the circuit breaker housing, which has an initial position and a test position; a second torsion spring including a second torsion spring body, and a third elastic arm and a fourth elastic arm extending outward from the second torsion spring body. The third elastic arm is connected to the circuit board through a second wire. The fourth elastic arm abuts against the bottom of the leakage test button for driving the leakage test button to reset from the test position to the initial position. The end of the fourth elastic arm is provided with a second contact portion that contacts and communicates with or separates from the conductive plate. When the leakage test button is in the test position, the second contact portion contacts the conductive plate, and the leakage test circuit where the second torsion spring is located is turned on.
[0007] The bottom of the leakage test button is provided with a second slot for the fourth elastic arm to insert.
[0008] The opening of the second slot is a flared opening.
[0009] The third elastic arm is provided with a third contact portion with multiple bends. The circuit breaker housing is provided with a third slot adapted to the third contact portion. The third contact portion is connected to the circuit board through the second wire.
[0010] The outer wall of the leakage test button is provided with a step, and the inner wall of the circuit breaker housing is provided with a limit block corresponding to the step. When the leakage test button is in the initial position, the limit block abuts against the top of the step.
[0011] The technical solution of the present utility model has the following advantages:
[0012] 1. The miniature circuit breaker provided by the present utility model has an operating mechanism including a handle, a connecting rod, a contact bracket and a tripping latch. During the closing process, under the elastic force of the third torsion spring, the second locking block of the tripping latch abuts against the first locking block of the contact bracket, and the second rod portion of the connecting rod abuts against the locking port. The handle drives the contact bracket and the tripping latch to rotate together through the connecting rod, so that the moving contact on the contact bracket contacts and communicates with the static contact; when faults such as overload and short circuit occur, the tripping latch trips under the action of an external force, causing the second locking block to separate from the first locking block, the opening of the locking port becomes larger, and the second rod portion moves out of the locking port, so that the circuit breaker trips. Compared with the prior art that requires setting a tripping latch and a locking latch, this saves the locking latch, has fewer parts, a simple structure, is quick and convenient to assemble, and reduces the production cost.
[0013] 2. For the miniature circuit breaker provided by the present utility model, the leakage test assembly includes: a leakage test button movably installed on the circuit breaker housing, which has an initial position and a test position; a second torsion spring including a second torsion spring body, and a third elastic arm and a fourth elastic arm extending outward from the second torsion spring body. The third elastic arm is connected to the circuit board through a second wire, and the fourth elastic arm abuts against the bottom of the leakage test button for driving the leakage test button to reset from the test position to the initial position. A second contact part for contacting and connecting or separating from the conductive plate is provided at the end of the fourth elastic arm. Wherein, when the leakage test button is in the test position, the second contact part contacts the conductive plate, and the leakage test loop where the second torsion spring is located is conducted. In this way, the second torsion spring can not only drive the leakage test button to reset, but also play a role in conducting electricity with the conductive plate, and the structure is simpler. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0015] Figure 1 is a schematic structural diagram of the miniature circuit breaker of the present utility model;
[0016] Figure 2 is a schematic structural diagram of the operating mechanism and the leakage test assembly;
[0017] Figure 3 is an exploded structural diagram of the operating mechanism, the leakage test assembly and the circuit board;
[0018] Figure 4 is an exploded structural diagram of the leakage test assembly;
[0019] Figure 5 is a perspective view of the circuit breaker housing;
[0020] Figure 6 is Figure 5 an enlarged structural diagram of part C in
[0021] Description of the reference numerals: 1. Contact mechanism; 2. Circuit breaker housing; 3. Moving contact; 4. Stationary contact; 5. Circuit board; 6. Conductive plate; 7. Operating mechanism; 8. Contact bracket; 18. Leakage test assembly; 19. Leakage test button; 20. Second torsion spring; 21. Second torsion spring body; 22. Second contact portion; 23. Third elastic arm; 24. Fourth elastic arm; 25. Step; 26. Limit block; 32. Handle; 34. Link; 35. First rod portion; 36. Second rod portion; 37. Second shaft; 38. Trip latch; 39. Third shaft; 40. Locking port; 41. First lock block; 42. Second lock block; 43. Third torsion spring; 44. Second slot; 45. Third contact portion; 46. Third slot. Detailed implementation manners
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0024] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0025] In addition, the technical features involved in different implementation manners of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0026] Embodiment
[0027] This embodiment provides a miniature circuit breaker, as Figure 1As shown, it includes a circuit breaker housing 2, and a contact mechanism 1, an operating mechanism 7, a circuit board 5, a conductive plate 6, and a leakage test assembly 18 disposed inside the circuit breaker housing 2.
[0028] The operating mechanism 7, such as Figure 2 and Figure 3 As shown, it includes: a handle 32 rotatably mounted on the circuit breaker housing 2; a connecting rod 34 having a first rod portion 35 connected to the handle 32 and a second rod portion 36 connected to a contact support 8; the contact support 8 rotatably mounted on the circuit breaker housing 2 by a second shaft 37, the contact support 8 being provided with a first locking block 41 that can abut against the second rod portion 36, a moving contact 3 being mounted on the contact support 8, and a return spring being provided between the contact support 8 and the circuit breaker housing 2; a trip latch 38 rotatably mounted on the contact support 8 by a third shaft 39, the third shaft 39 being non-coaxial with the second shaft 37, the trip latch 38 having a second locking block 42 corresponding to the first locking block 41, a locking opening 40 being formed between the second locking block 42 and the first locking block 41, a third torsion spring 43 being provided between the trip latch 38 and the contact support 8, the trip latch 38 having an initial position corresponding to normal operation of the circuit breaker and a tripping position corresponding to tripping of the circuit breaker in case of a fault, wherein, in the initial position, under the elastic force of the third torsion spring 43, the second locking block 42 abuts against the first locking block 41, and the second rod portion 36 abuts against the locking opening 40; in the tripping position, the second locking block 42 is separated from the first locking block 41, the opening of the locking opening 40 becomes larger, and the second rod portion 36 moves out of the locking opening 40.
[0029] The circuit board 5, the conductive plate 6, and the leakage test assembly 18 are disposed inside the circuit breaker housing 2, the conductive plate 6 being connected to the circuit board 5 by a first wire, such as Figure 4 As shown, the leakage test assembly 18 includes: a leakage test button 19 movably mounted on the circuit breaker housing 2, which has an initial position and a test position; a second torsion spring 20 including a second torsion spring body 21, and a third elastic arm 23 and a fourth elastic arm 24 extending outward from the second torsion spring body 21, the third elastic arm 23 being provided with a third contact portion 45 having multiple bends, such as Figure 6As shown, a third slot 46 adapted to the third contact portion 45 is provided on the circuit breaker housing 2. The third contact portion 45 is connected to the circuit board 5 through the second wire. The fourth elastic arm 24 abuts against the bottom of the leakage test button 19 and is used to drive the leakage test button 19 to reset from the test position to the initial position. A second contact portion 22 that contacts, communicates with, or separates from the conductive plate 6 is provided at the end of the fourth elastic arm 24. Among them, when the leakage test button 19 is in the test position, the second contact portion 22 contacts the conductive plate 6, and the leakage test return where the second torsion spring 20 is located is conducted. A second slot 44 for inserting the fourth elastic arm 24 is provided at the bottom of the leakage test button 19, and the opening of the second slot 44 is a flared opening. In this embodiment, a step 25 is provided on the outer wall of the leakage test button 19, as Figure 5 and Figure 6 shown, a limiting block 26 corresponding to the step 25 is provided on the inner wall of the circuit breaker housing 2. Among them, when the leakage test button 19 is in the initial position, the limiting block 26 abuts against the top of the step 25.
[0030] For the miniature circuit breaker provided by the present utility model, the operating mechanism includes a handle 32, a connecting rod 34, a contact support 8, and a tripping latch 38. During the closing process, under the elastic action of the third torsion spring 43, the second locking block 42 of the tripping latch 38 abuts against the first locking block 41 of the contact support 8, and the second rod portion 36 of the connecting rod 34 abuts against the locking port 40. The handle 32 drives the contact support 8 and the tripping latch 38 to rotate together through the connecting rod 34, so that the moving contact 3 on the contact support 8 contacts and communicates with the static contact 4; when faults such as overload and short circuit occur, the tripping latch 38 trips under an external force, causing the second locking block 42 to separate from the first locking block 41, the opening of the locking port 40 becomes larger, and the second rod portion 36 moves out of the locking port 40, thereby tripping the circuit breaker. Compared with the prior art that requires setting a tripping latch and a locking latch, the locking latch is omitted, the number of parts is small, the structure is simple, the assembly is fast and convenient, and the production cost is reduced.
[0031] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the creative concept of the present utility model.
Claims
1. A miniature circuit breaker, comprising a contact mechanism (1) and an operating mechanism (7), the contact mechanism (1) comprising a moving contact (3) and a static contact (4), characterized in that, The operating mechanism (7) includes: A handle (32) rotatably mounted on the circuit breaker housing (2); A connecting rod (34) having a first rod portion (35) connected to the handle (32) and a second rod portion (36) connected to the contact support (8); A contact support (8) rotatably mounted on the circuit breaker housing (2) by a second shaft (37). The contact support (8) is provided with a first locking block (41) that can abut against the second rod portion (36). A moving contact (3) is mounted on the contact support (8); A tripping latch (38) rotatably mounted on the contact support (8) by a third shaft (39). The third shaft (39) is not coaxial with the second shaft (37). The tripping latch (38) has a second locking block (42) corresponding to the first locking block (41). A locking opening (40) is formed between the second locking block (42) and the first locking block (41). A third torsion spring (43) is provided between the tripping latch (38) and the contact support (8). The tripping latch (38) has an initial position corresponding to the normal operation of the circuit breaker and a tripping position corresponding to the tripping of the circuit breaker in case of a fault. Wherein, in the initial position, under the elastic force of the third torsion spring (43), the second locking block (42) abuts against the first locking block (41), and the second rod portion (36) abuts against the locking opening (40); in the tripping position, the second locking block (42) is separated from the first locking block (41), the opening of the locking opening (40) becomes larger, and the second rod portion (36) moves out of the locking opening (40).
2. The miniature circuit breaker according to claim 1, characterized in that, A circuit board (5), a conductive plate (6) and a leakage test assembly (18) are provided inside the circuit breaker housing (2). The conductive plate (6) is connected to the circuit board (5) by a first wire. The leakage test assembly (18) includes: A leakage test button (19) movably mounted on the circuit breaker housing (2), which has an initial position and a test position; A second torsion spring (20) includes a second torsion spring body (21), and a third elastic arm (23) and a fourth elastic arm (24) extending outward from the second torsion spring body (21). The third elastic arm (23) is connected to the circuit board (5) by a second wire. The fourth elastic arm (24) abuts against the bottom of the leakage test button (19) for driving the leakage test button (19) to reset from the test position to the initial position. A second contact portion (22) that contacts and communicates with or separates from the conductive plate (6) is provided at the end of the fourth elastic arm (24). Wherein, when the leakage test button (19) is in the test position, the second contact portion (22) contacts the conductive plate (6), and the leakage test loop where the second torsion spring (20) is located is conducted.
3. The miniature circuit breaker according to claim 2, characterized in that, A second slot (44) for inserting the fourth elastic arm (24) is provided at the bottom of the leakage test button (19).
4. The miniature circuit breaker according to claim 3, characterized in that, The opening of the second slot (44) is a flared opening.
5. The miniature circuit breaker according to any one of claims 2-4, characterized in that, The third elastic arm (23) is provided with a third contact part (45) with multiple bends, a third slot (46) adapted to the third contact part (45) is provided on the circuit breaker housing (2), and the third contact part (45) is connected to the circuit board (5) through the second wire.
6. The miniature circuit breaker according to any one of claims 2-4, characterized in that, A step (25) is provided on the outer wall of the leakage test button (19), and a limiting block (26) corresponding to the step (25) is provided on the inner wall of the circuit breaker housing (2). When the leakage test button (19) is in the initial position, the limiting block (26) abuts against the top of the step (25).