Circuit breaker
By replacing the plastic elastic tail with a metal torsion spring in the circuit breaker, the problem of the latch failing to reset under high temperature conditions was solved, thus improving the service life and reliability of the circuit breaker.
Patent Information
- Application Number
- CN202520451871.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-14
AI Technical Summary
Existing circuit breakers experience increased failure rates and negatively impact user experience due to the failure of the elastic tail of the plastic material in high-temperature environments, which prevents the latch from resetting.
A torsion spring made of metal is used to replace the elastic tail on the latch, providing a restoring force to ensure that the latch can reset properly in high-temperature environments.
This improves the service life of circuit breakers in high-temperature environments, avoids latch reset failures, and enhances equipment reliability and user experience.
Smart Images
Figure CN223941757U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a circuit breaker. Background Technology
[0002] Circuit breakers are important electrical components in charging stations. They can control the on / off state of the circuit, carry current, and protect the lines and electrical equipment. When an abnormality occurs in the circuit, the circuit breaker installed in the circuit will activate its internal tripping mechanism according to changes in electrical or thermal parameters, and promptly disconnect the power line to protect the electrical equipment and the circuit.
[0003] When the tripping mechanism in a circuit breaker trips the tripping and locking latches, the locking latch also needs to reset and engage with the tripping latch after the tripping mechanism resets to facilitate smooth reclosing of the circuit breaker. In existing technology, a resilient tail is typically fixed to the locking latch to achieve this reset. When the tripping mechanism drives the locking latch to trip, the resilient tail abuts against the housing, providing the locking latch with a resilient force for reset. However, in this structure, the resilient tail is a plastic component fixed to the locking latch. Since the temperature inside a charging station exceeds 70°C, the plastic resilient tail is prone to elastic failure at high temperatures, leading to the locking latch failing to reset, increasing the failure rate, and negatively impacting user experience. Utility Model Content
[0004] The purpose of this invention is to provide a circuit breaker that can still reset the latch in high-temperature environments, thereby improving the user experience.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] A circuit breaker, including a housing and an operating mechanism disposed within the housing;
[0007] The operating mechanism includes a rotating component, a jump buckle, a locking buckle, and a torsion spring. The rotating component is rotatably disposed within the housing. The jump buckle and the locking buckle are both rotatably disposed on the rotating component. The torsion spring is a metal component and is used to provide a restoring force to the locking buckle to rotate back towards the jump buckle, so that the jump buckle and the locking buckle overlap each other.
[0008] As an optional solution, the housing is provided with a first shaft and a second shaft, the rotating component is provided with a first rotating hole and a limiting elongated hole, the first rotating hole is rotatably connected to the first shaft, and the second shaft is located in the limiting elongated hole;
[0009] The torsion spring is sleeved on the buckle, and the first extension rod at one end of the torsion spring elastically abuts against the second shaft, while the second extension rod at the other end of the torsion spring elastically abuts against the end of the buckle away from the jump buckle.
[0010] As an alternative, the end of the latch away from the jump buckle is provided with a hook plate, and the second extension rod elastically abuts against and is confined within the hook plate.
[0011] As an alternative, the latch is provided with a cylindrical boss, and the torsion spring is sleeved on the cylindrical boss.
[0012] As an alternative, the inner wall of the housing is provided with a first shaft and a second shaft, the rotating component is provided with a first rotating hole and a limiting elongated hole, the first rotating hole is rotatably connected to the first shaft, and the second shaft is located in the limiting elongated hole;
[0013] The torsion spring is sleeved on the first shaft, and the first bent rod at one end of the torsion spring elastically abuts against the end of the lock near the jump buckle, while the second bent rod at the other end of the torsion spring elastically abuts against the rotating component.
[0014] As an alternative, the first bending rod is bent to form a clearance opening, and the second shaft is located in the clearance opening.
[0015] As an alternative, the rotating component has a recess on the side away from the jump buckle, and the second bending rod hooks the rotating component and is confined within the recess.
[0016] As an optional solution, the circuit breaker also includes an electromagnetic tripping mechanism and a bimetallic tripping mechanism;
[0017] The circuit breaker also includes two terminal blocks that are electrically connected to the electromagnetic tripping mechanism and the bimetallic tripping mechanism respectively, as well as fasteners disposed on the terminal blocks. The terminal blocks are connected to the inner wall of the housing, and the terminal blocks are provided with through holes. The fasteners are inserted into the corresponding through holes of the terminal blocks to press the external wires onto the corresponding terminal blocks.
[0018] As an alternative, the fastener includes a bolt and a nut, the nut being disposed on the end face of the terminal block away from the operating mechanism and concentric with the through hole, the bolt passing through the through hole and screwed to the nut, and the external wire being sleeved on the stud of the bolt and pressed between the nut of the bolt and the terminal block.
[0019] As an optional solution, both sides of the housing are provided with insertion slots;
[0020] The wiring board is provided with plug-in bosses on both sides facing the housing, and the plug-in bosses can be plugged into the corresponding plug-in slots.
[0021] The beneficial effects of this utility model are:
[0022] The circuit breaker provided by this utility model uses a torsion spring made of metal to replace the elastic tail fixed on the latch in the prior art. This avoids the situation where the latch cannot be reset due to the failure of the elasticity of the circuit breaker in high temperature environment, and improves the service life of the circuit breaker in high temperature environment. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the circuit breaker provided in Embodiment 1 of this utility model with one half of the shell removed;
[0024] Figure 2 This is a schematic diagram of the operating mechanism involved in Embodiment 1 of this utility model;
[0025] Figure 3 This is a schematic diagram of the shell structure according to Embodiment 1 of this utility model;
[0026] Figure 4 This is a schematic diagram of the electromagnetic tripping mechanism according to Embodiment 1 of this utility model;
[0027] Figure 5 This is a schematic diagram of the operating mechanism involved in Embodiment 2 of this utility model;
[0028] Figure 6 This is a schematic diagram of the rotating component involved in Embodiment 2 of this utility model;
[0029] Figure 7 This is a schematic diagram of the torsion spring involved in Embodiment 2 of this utility model.
[0030] In the picture:
[0031] 1. Housing; 11. Half-shell; 111. Insertion slot; 12. First shaft; 13. Second shaft;
[0032] 2. Handle;
[0033] 3. Operating mechanism; 31. Rotating component; 311. Limiting elongated hole; 312. Rotating shaft; 313. Recess; 32. Connecting rod; 33. Jumper buckle; 34. Lock; 341. Hook plate; 342. Cylindrical boss; 343. Extension end; 35. Torsion spring; 351. First extension rod; 352. Second extension rod; 353. First bending rod; 354. Second bending rod;
[0034] 4. Electromagnetic tripping mechanism; 41. Bracket; 42. Iron core; 43. Coil;
[0035] 5. Double-metal release mechanism;
[0036] 6. Terminal block; 61. Plug-in boss;
[0037] 7. Fasteners; 71. Bolts; 72. Nuts; 73. Spring washers; 74. Flat washers;
[0038] 8. Arc extinguishing chamber. Detailed Implementation
[0039] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0041] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0042] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0043] Example 1
[0044] like Figures 1-4 As shown, this utility model embodiment provides a circuit breaker, including a housing 1, a handle 2 rotatably mounted on the housing 1, an operating mechanism 3 disposed inside the housing 1, and a tripping mechanism (electromagnetic tripping mechanism 4 and bimetallic tripping mechanism 5).
[0045] The handle 2 has an open position and an closed position.
[0046] The operating mechanism 3 includes a rotating component 31, a connecting rod 32, a jump buckle 33, a locking buckle 34, and a torsion spring 35. The rotating component 31 is rotatably disposed within the housing 1. The connecting rod 32 is connected to the jump buckle 33 and the handle 2. The jump buckle 33 and the locking buckle 34 are both rotatably disposed on the rotating component 31, and the jump buckle 33 and the locking buckle 34 can overlap and engage with each other. The torsion spring 35 is a metal component (such as stainless steel wire), and the torsion spring 35 and the locking buckle 34 are separate structures.
[0047] When the circuit breaker is operating normally, when the handle 2 is switched from the open position to the closed position, the rotating component 31 is driven to rotate so that the moving contact and the stationary contact contact to achieve closing. At the same time, the handle 2 also drives the trip latch 33 to rotate through the connecting rod 32. The trip latch 33 then drives the latch 34 to rotate, so that the handle 2 is limited to the closed position. When the handle 2 is switched from the closed position to the open position, the rotating component 31 rotates back to reset so that the moving contact and the stationary contact separate to achieve opening. At the same time, the trip latch 33 drives the latch 34 to rotate back to reset. The torsion spring 35 applies an elastic force to the latch 34 towards the rotation of the trip latch 33, so that the trip latch 33 and the latch 34 remain in an overlapping state, so that when the handle 2 is switched back to the closed position, the circuit breaker can be successfully closed.
[0048] When a short circuit or overload fault occurs in the circuit breaker, the tripping mechanism drives the latch 34 to rotate, so that the trip latch 33 and the latch 34 separate and trip. At this time, the handle 2 switches from the closed position to the open position, and the rotating part 31 rotates back towards the open position to separate the moving contact and the stationary contact to achieve the tripping and de-energizing. After the tripping mechanism resets, the latch 34 rotates back towards the trip latch 33 under the elastic force of the torsion spring 35 to reset, so that the trip latch 33 and the latch 34 remain in the overlapping state to ensure that the circuit can be closed smoothly after the fault is cleared.
[0049] Understandably, when the circuit breaker trips normally or trips due to a fault, the torsion spring 35 can apply an elastic force to the latch 34 so that the latch 34 has a restoring force to rotate toward the trip latch 33, so as to ensure that the trip latch 33 and the latch 34 always remain in the overlapping state.
[0050] The circuit breaker uses a torsion spring 35 made of metal instead of the elastic tail fixed to the latch 34 in the prior art. This avoids the situation where the latch 34 cannot be reset due to the failure of the elasticity of the circuit breaker in high temperature environment, and improves the service life of the circuit breaker in high temperature environment.
[0051] In this embodiment, a first shaft 12 and a second shaft 13 are provided inside the housing 1. The rotating member 31 is provided with a first rotating hole and a limiting elongated hole 311. The first rotating hole is used to rotatably connect with the first shaft 12 so that the rotating member 31 is rotatably disposed inside the housing 1. The second shaft 13 is located inside the limiting elongated hole 311 to limit the rotation angle of the rotating member 31. The rotating member 31 is provided with a rotating shaft 312, and the latch 34 is provided with a second rotating hole. The second rotating hole is rotatably connected with the rotating shaft 312 so that the latch 34 is rotatably connected with the rotating member 31.
[0052] Optionally, a first extension rod 351 is provided at one end of the torsion spring 35, and a second extension rod 352 is provided at the other end of the torsion spring 35. The torsion spring 35 is sleeved on the latch 34, and the first extension rod 351 elastically abuts against the second shaft 13, and the second extension rod 352 elastically abuts against the end of the latch 34 away from the trip latch 33. When the circuit breaker trips, the torsion spring 35 can apply an elastic force to the end of the latch 34 away from the trip latch 33, so that the latch 34 has a restoring force to rotate toward the trip latch 33.
[0053] Specifically, the latch 34 is provided with a cylindrical boss 342, the second rotating hole passes through the cylindrical boss 342, and the torsion spring 35 is sleeved on the cylindrical boss 342 to realize the installation of the torsion spring 35.
[0054] Optionally, a hook plate 341 is provided at the end of the latch 34 away from the jump buckle 33. The second extension rod 352 elastically abuts against the hook plate 341. It can be understood that the opening of the hook plate 341 is set away from the jump buckle 33, that is, the first extension rod 351 and the second extension rod 352 elastically abut against the side opposite to the second shaft 13 and the hook plate 341, respectively. By providing the hook plate 341 in the latch 34, the hook plate 341 limits the second extension rod 352 to prevent the torsion spring 35 from falling off.
[0055] In this embodiment, the tripping mechanism includes an electromagnetic tripping mechanism 4 and a double-metal tripping mechanism 5. When a short circuit occurs in the circuit, the electromagnetic tripping mechanism 4 drives the latch 34 to rotate and separate from the trip latch 33. When an overload occurs in the circuit, the double-metal tripping mechanism 5 drives the latch 34 to rotate and separate from the trip latch 33.
[0056] Furthermore, the circuit breaker also includes two terminal blocks 6 that are electrically connected to the coil 43 of the electromagnetic tripping mechanism 4 and the metal sheet of the bimetallic tripping mechanism 5, respectively, and fasteners 7 disposed on the terminal blocks 6. The terminal blocks 6 are connected to the inner wall of the housing 1, and the terminal blocks 6 are provided with through holes. The fasteners 7 pass through the corresponding through holes of the terminal blocks 6 to press the external wires onto the terminal blocks 6. This structure improves the installation firmness of the external wires by connecting the fasteners 7 to the terminal blocks 6 to fix the external wires.
[0057] Specifically, the fastener 7 includes a bolt 71 and a nut 72. The nut 72 is located on the end face of the terminal block 6 away from the operating mechanism 3 and is concentric with the through hole. The bolt 71 passes through the through hole and is screwed into the nut 72. The external wire is sleeved on the stud of the bolt 71 and pressed between the nut of the bolt 71 and the terminal block 6. This structure is simple, easy to use, and has a strong clamping force.
[0058] Optionally, nut 72 can be riveted or welded to terminal block 6.
[0059] Furthermore, the fastener 7 also includes a spring washer 73 and a flat washer 74 sequentially sleeved on the stud of the bolt 71. The external wire is clamped between the flat washer 74 and the terminal block 6. This structure, by setting the flat washer 74 and the spring washer 73, can effectively prevent the bolt 71 from loosening and can avoid wear on the external wire when tightening the bolt 71.
[0060] In this embodiment, as Figure 3 and combined Figure 1 As shown, the housing 1 includes two interlocking half-shells 11.
[0061] Optionally, each of the inner sidewalls of the two half-shells 11 is provided with a plug-in groove 111, and each of the two ends of the terminal block 6 facing the two half-shells 11 is provided with a plug-in boss 61. When the two half-shells 11 are fastened together, the plug-in bosses 61 on both ends of the terminal block 6 are respectively inserted into the plug-in grooves 111 of the two half-shells 11 to realize the installation and fixation of the terminal block 6, and the terminal block 6 is easy to install.
[0062] Optionally, such as Figure 4 As shown, the electromagnetic tripping mechanism 4 includes a bracket 41, an iron core 42 disposed on the bracket 41, and a coil 43 sleeved on the iron core 42.
[0063] The circuit breaker also includes an arc-extinguishing chamber 8, which has 13 plates to accelerate the extinction of the arc.
[0064] Example 2
[0065] The circuit breaker provided in this embodiment of the present invention has a structure that is basically the same as that in Embodiment 1. For convenience, only the differences are described here.
[0066] like Figures 5-7 As shown, a first bending rod 353 is provided at one end of the torsion spring 35, and a second bending rod 354 is provided at the other end of the torsion spring 35. The torsion spring 35 is sleeved on the first shaft 12, and the first bending rod 353 elastically abuts against the end of the latch 34 near the jumper 33, while the second bending rod 354 elastically abuts against the rotating member 31. In this structure, the second bending rod 354 elastically abuts against the rotating member 31, and the first bending rod 353 elastically abuts against the end of the latch 34 near the jumper 33, so that the torsion spring 35 can apply a restoring force to the latch 34 to rotate toward the jumper 33.
[0067] Furthermore, the first bending rod 353 is bent to form a clearance opening, and the second shaft 13 is located in the clearance opening to prevent the second shaft 13 from affecting the rotation path of the first bending rod 353 during the reset process.
[0068] Furthermore, a recess 313 is provided on the side of the rotating member 31 away from the snap fastener 33, and the second bent rod 354 hooks onto the rotating member 31 and is confined within the recess 313. By hooking the second bent rod 354 onto the rotating member 31, the torsion spring 35 can be prevented from falling off, and the second bent rod 354 is confined within the recess 313, so that the second bent rod 354 and the rotating member 31 form elastic contact, preventing the torsion spring 35 from rotating on its own, thereby affecting the reset of the latch 34.
[0069] Optionally, the end of the latch 34 that abuts against the first bending rod 353 is provided with an extension end 343, and the first bending rod 353 elastically abuts against the extension end 343, making the structural design more reasonable.
[0070] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A circuit breaker, comprising a housing (1) and an operating mechanism (3) disposed within the housing (1); Its features are, The operating mechanism (3) includes a rotating component (31), a jump buckle (33), a locking buckle (34), and a torsion spring (35). The rotating component (31) is rotatably disposed within the housing (1). The jump buckle (33) and the locking buckle (34) are both rotatably disposed on the rotating component (31). The torsion spring (35) is a metal component and is used to provide a restoring force to the locking buckle (34) to rotate back towards the jump buckle (33), so that the jump buckle (33) and the locking buckle (34) overlap each other.
2. The circuit breaker according to claim 1, characterized in that, The housing (1) is provided with a first shaft (12) and a second shaft (13). The rotating part (31) is provided with a first rotating hole and a limiting elongated hole (311). The first rotating hole is rotatably connected to the first shaft (12), and the second shaft (13) is located in the limiting elongated hole (311). The torsion spring (35) is sleeved on the buckle (34), and the first extension rod (351) at one end of the torsion spring (35) elastically abuts against the second shaft (13), and the second extension rod (352) at the other end of the torsion spring (35) elastically abuts against the end of the buckle (34) away from the jump buckle (33).
3. The circuit breaker according to claim 2, characterized in that, The latch (34) is provided with a hook plate (341) at one end away from the jumper (33), and the second extension rod (352) elastically abuts against and is confined within the hook plate (341).
4. The circuit breaker according to claim 2, characterized in that, The latch (34) is provided with a cylindrical boss (342), and the torsion spring (35) is sleeved on the cylindrical boss (342).
5. The circuit breaker according to claim 1, characterized in that, The inner wall of the housing (1) is provided with a first shaft (12) and a second shaft (13). The rotating part (31) is provided with a first rotating hole and a limiting elongated hole (311). The first rotating hole is rotatably connected to the first shaft (12), and the second shaft (13) is located inside the limiting elongated hole (311). The torsion spring (35) is sleeved on the first shaft (12), and the first bent rod (353) at one end of the torsion spring (35) elastically abuts against the end of the latch (34) near the jump buckle (33), and the second bent rod (354) at the other end of the torsion spring (35) elastically abuts against the rotating member (31).
6. The circuit breaker according to claim 5, characterized in that, The first bending rod (353) is bent to form a clearance opening, and the second shaft (13) is located in the clearance opening.
7. The circuit breaker according to claim 5, characterized in that, The rotating member (31) has a recess (313) on the side away from the jump buckle (33), and the second bending rod (354) hooks the rotating member (31) and is confined within the recess (313).
8. The circuit breaker according to any one of claims 1-7, characterized in that, The circuit breaker also includes an electromagnetic tripping mechanism (4) and a bimetallic tripping mechanism (5); The circuit breaker also includes two terminal blocks (6) that are electrically connected to the electromagnetic tripping mechanism (4) and the bimetallic tripping mechanism (5) respectively, and fasteners (7) disposed on the terminal blocks (6). The terminal blocks (6) are connected to the inner wall of the housing (1), and the terminal blocks (6) are provided with through holes. The fasteners (7) are inserted into the through holes of the corresponding terminal blocks (6) to press the external wires onto the corresponding terminal blocks (6).
9. The circuit breaker according to claim 8, characterized in that, The fastener (7) includes a bolt (71) and a nut (72). The nut (72) is disposed on the end face of the terminal block (6) away from the operating mechanism (3) and is concentric with the through hole. The bolt (71) passes through the through hole and is screwed to the nut (72). The external wire is sleeved on the stud of the bolt (71) and pressed between the nut of the bolt (71) and the terminal block (6).
10. The circuit breaker according to claim 8, characterized in that, Both sides of the housing (1) are provided with insertion slots (111); The wiring board (6) is provided with plug-in bosses (61) on both sides facing the housing (1), and the plug-in bosses (61) can be plugged into the corresponding plug-in slots (111).