circuit breaker

Abstract

A circuit breaker includes a housing with two ends serving as terminals. Each terminal contains a wiring terminal, which corresponds to an operating hole and a wiring port located within the housing. An operating mechanism is housed within the housing, and an overload protection mechanism is located within the housing between the operating mechanism and one of the terminals. The overload protection mechanism includes a bimetallic component and an adjusting screw. The bimetallic component cooperates with the operating mechanism. An adjusting hole is located on the same side wall of the housing between the operating hole and the operating mechanism, with one end of the adjusting screw corresponding to the adjusting hole and the other end connected to the bimetallic component for adjusting the distance between the bimetallic component and the operating mechanism. In this invention, the adjusting hole and the operating hole are located on the same side of the housing, facilitating adjustment of the terminals and the overload protection mechanism from the same side, shortening the distance between the adjusting hole and the bimetallic component, saving internal space, and reducing costs.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device used to disconnect and connect load circuits, and to disconnect faulty circuits to prevent the escalation of accidents, thereby ensuring the safe operation of the load circuit. In existing circuit breakers, the terminals and overload protection mechanisms located inside the casing require external tightening of the corresponding terminal screws and adjusting screws. However, the existing circuit breaker structure has the following drawbacks: First, the operating holes for the terminal screws and the adjusting holes for the adjusting screws are located on two adjacent side walls of the casing, requiring sufficient space outside the two side walls of the circuit breaker for operation. Second, the adjusting holes and the overload protection mechanism are usually located on opposite sides of the terminal, resulting in a large distance between the adjusting holes and the bimetallic assembly. This means that at least one of the adjusting screws or the bimetallic assembly needs to pass through or around the terminal, increasing the length of the parts and hindering cost savings. Third, the overload protection mechanism is usually located between the exhaust end of the arc-extinguishing chamber and the terminal, and the high-temperature exhaust gas from the arc-extinguishing chamber interferes with the operation of the overload protection mechanism. Utility Model Content

[0003] The purpose of this invention is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a circuit breaker, including a housing, with both ends of the housing serving as terminals. Each terminal has a corresponding operating hole and wiring port. An operating mechanism is located within the housing, and an overload protection mechanism is located within the housing between the operating mechanism and one of the terminals. The overload protection mechanism includes a bimetallic component and an adjusting screw. The bimetallic component cooperates with the operating mechanism. An adjusting hole is located on the same side wall of the housing between the operating hole and the operating mechanism, with one end of the adjusting screw corresponding to the adjusting hole and the other end connected to the bimetallic component for adjusting the distance between the bimetallic component and the operating mechanism.

[0006] Preferably, the outer casing connected between the two terminals protrudes outward to form an operating end, the operating mechanism is disposed inside the operating end, and the adjustment hole is located between one of the terminals and the operating end.

[0007] Preferably, the bimetallic component extends obliquely along the direction from the adjustment hole to the operating mechanism, such that one end of the bimetallic component is spaced apart from the operating mechanism, and the other end of the bimetallic component is connected to an adjacent terminal block through a conductive plate, and the adjustment screw is connected to the other end of the bimetallic component.

[0008] Preferably, it also includes an arc-extinguishing chamber, wherein the bimetallic component is disposed between the arc-extinguishing chamber and the operating mechanism.

[0009] Preferably, one end of the arc-extinguishing chamber is provided with an arc inlet, and the other end of the arc-extinguishing chamber away from the arc inlet is an exhaust end, and the bimetallic component is arranged along one side between the arc inlet and the exhaust end of the arc-extinguishing chamber.

[0010] Preferably, the exhaust end is opposite to the adjacent wiring terminal, the wiring terminal is provided with an air outlet, and an exhaust channel is connected between the exhaust end and the air outlet.

[0011] Preferably, the operating mechanism includes a lever with a rotating assembly, on which a jump buckle and a lock buckle are rotatably mounted, and the jump buckle and the lock buckle are fastened together. The lock buckle is provided with an unlocking part, which is triggered by the double metal component to release the lock buckle from the fastening engagement.

[0012] Preferably, one end of the latch is provided with a latch portion, which cooperates with a snap hook, and the other end of the latch is provided with a cantilever, which is located on opposite sides of the latch's rotation axis, and the cantilever is provided with an unlocking portion.

[0013] Preferably, one end of the dual-metal component is stacked with the cantilever, and the unlocking part protrudes outward along a plane perpendicular to the cantilever, so that one end of the dual-metal component and the unlocking part are spaced apart and opposite each other.

[0014] Preferably, the housing further includes a contact system comprising a moving contact assembly and two stationary contacts. The moving contact assembly is disposed between two terminals and drivenly connected to the operating mechanism. Each stationary contact is located between the moving contact assembly and an adjacent terminal. The bimetallic assembly is located between one of the stationary contacts and the operating mechanism. The adjusting screw is located on the side of the bimetallic assembly facing away from the stationary contact.

[0015] Preferably, the moving contact assembly includes a rotating shaft driven to rotate by an operating mechanism, and a moving contact bridge is provided at the middle of the rotating shaft along the radial direction of the rotating shaft. The two ends of the moving contact bridge extend outside the rotating shaft as two moving contact portions, and each moving contact portion cooperates with a stationary contact.

[0016] Alternatively, the moving contact assembly includes a contact support, which is driven to move linearly by an operating mechanism. The contact support is provided with a moving contact bridge, the two ends of which extend as two moving contact portions to opposite sides of the contact support, each moving contact portion cooperating with a stationary contact.

[0017] The circuit breaker of this utility model has the adjustment hole and the operating hole located on the same side of the housing, which facilitates the adjustment of the wiring terminals and overload protection mechanism from the same side. At the same time, the setting position of the adjustment hole has been changed, and the distance between the adjustment hole and the bimetallic assembly has been shortened. This means that the adjustment screw or bimetallic assembly no longer needs to cross or avoid the wiring terminals, nor does it need to be opposite to the exhaust end of the arc-extinguishing chamber. This shortens the length of the bimetallic assembly or adjustment screw, saves internal space, and reduces costs.

[0018] In addition, the adjustment hole is adjacent to the operating end, and the operating end provides an assembly position for the operating mechanism. This makes it convenient to set the overload protection mechanism in the housing between the wiring terminal and the operating end. The overload protection mechanism can simultaneously accommodate the operating mechanism and the adjustment hole in the assembly position, which has the advantage of reasonable layout.

[0019] In addition, the bimetallic components, through tilted assembly, can make full use of the space near the operating mechanism, thereby improving space utilization.

[0020] In addition, the overload protection mechanism avoids the exhaust end of the arc-extinguishing chamber to prevent the exhaust gas after arc extinguishing from interfering with the bimetallic module.

[0021] In addition, the latch is equipped with a cantilever, and the double metal components are stacked on the cantilever, which improves the stability of the fit. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the circuit breaker of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the circuit breaker of this utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of the circuit breaker of this utility model;

[0025] Figure 4 This is a schematic diagram showing the cooperation between the overload protection mechanism and the stationary contact in this utility model;

[0026] Figure 5 This is a schematic diagram of the locking mechanism in this utility model;

[0027] Figure label:

[0028] 10-Circuit breaker pole, 11-Housing, 111-Terminal, 112-Operating terminal, 113-Operating hole, 114-Adjusting hole, 115-Connecting port, 117-Gas outlet, 2-Operating mechanism, 21-Lever, 22-Tap latch, 23-Lock, 230-Circular plate, 231-Snap fastener, 232-Cantilever, 233-Connecting plate, 234-Unlocking part, 24-Linkage, 25-Reset torsion spring, 31-Moving contact assembly, 310-Contact support, 311-Moving contact bridge, 312-Shaft, 32-Stationary contact, 4-Arc extinguishing system, 41-Arc extinguishing chamber, 42-Exhaust passage, 421-Isolation part, 5-Short circuit protection mechanism, 6-Overload protection mechanism, 61-Bimetallic assembly, 62-Adjusting screw, 7-Terminal, 8-Handle mechanism. Detailed Implementation

[0029] The specific embodiments of the circuit breaker of this utility model are further described below with reference to the accompanying drawings. The circuit breaker of this utility model is not limited to the descriptions in the following embodiments.

[0030] The circuit breaker includes a housing 11, with opposite ends of the housing 11 serving as terminals 111. Each terminal 111 has an operating hole 113 and a wiring port 115 on two adjacent side walls. A terminal 7 is installed inside the terminal 111. The terminal 7 typically includes a wiring frame and a wiring screw. The wiring frame corresponds to the adjacent wiring port 115 and is used to connect to an external conductor. One end of the wiring screw is rotatably mounted on the wiring frame, and the other end corresponds to an operating hole 113 of the terminal 111. The wiring screw is operated by rotating through the operating hole 113, thereby engaging the wiring frame with the wiring screw to connect to an external conductor.

[0031] An operating mechanism 2 and at least one circuit breaker pole 10 are provided inside the housing 11. The operating mechanism 2 is rotatably mounted inside the housing 11. Each circuit breaker pole 10 includes a pair of terminals 7, a contact system, and an arc extinguishing system 4. The contact system includes a cooperating moving contact assembly 31 and two stationary contacts 32. Each stationary contact 32 is electrically connected to the adjacent terminal 7. The moving contact assembly 31 is located between the two stationary contacts 32 and is driven by the operating mechanism 2, so that the moving contact assembly 31 simultaneously contacts or separates from the two stationary contacts 32, thereby connecting or disconnecting the main line of each circuit breaker pole 10. The arc extinguishing system 4 cooperates with the contact system to extinguish the electric arc generated when the contact system is opened. The exhaust gas generated by the arc extinguishing system 4 is discharged from the vent 117 opened on the housing 11.

[0032] An overload protection mechanism 6 is connected to the main line of at least one circuit breaker pole 10. The overload protection mechanism 6 is installed inside the housing 11 and cooperates with the operating mechanism 2. The overload protection mechanism 6 is located between the operating mechanism 2 and a terminal 7. When an overload fault occurs in the main line, the overload protection mechanism 6 triggers the operating mechanism 2 to trip. Specifically, the overload protection mechanism 6 includes a bimetallic component 61 and an adjusting screw 62. One end of the bimetallic component 61 is fixed inside the housing 11, and the other end is opposite to the operating mechanism 2. One end of the adjusting screw 62 is connected to the fixed end of the bimetallic component 61, and the other end of the adjusting screw 62 protrudes from the adjusting hole 114 opened on the housing 11. By operating the adjusting screw 62, the distance between the bimetallic component 61 and the operating mechanism 2 is changed, thereby realizing the current value setting.

[0033] The improvement of this application lies in that the housing 11 between the operating hole 113 and the operating mechanism 2 is provided with an adjustment hole 114, and the adjustment hole 114 and the operating hole 113 are located on the same side wall of the housing 11. One end of the adjusting screw 62 corresponds to the adjustment hole 114, and the other end is connected to the bimetallic component 61 for adjusting the distance between the bimetallic component 61 and the operating mechanism 2. In this way, the adjustment hole 114 and the operating hole 113 are located on the same side of the housing 11, which facilitates the adjustment of the terminal 7 and the overload protection mechanism 6 from the same side. At the same time, the setting position of the adjustment hole 114 is changed, and the distance between the adjustment hole 114 and the bimetallic component 61 is shortened. This means that the adjusting screw 62 or the bimetallic component 61 no longer needs to cross or avoid the terminal 7, nor does it need to be opposite the exhaust end of the arc-extinguishing chamber 41. This shortens the length of the bimetallic component 61 or the adjusting screw 62, saves internal space, and reduces costs.

[0034] Specifically, the outer casing 11 connected between the two terminals 111 protrudes outward to form an operating end 112. The operating mechanism 2 is located inside the operating end 112. The adjustment hole 114 is located between one terminal 111 and the operating end 112. The interior of the operating end 112 provides an assembly position for the operating mechanism 2, leaving sufficient space for the overload protection mechanism 6. This allows the overload protection mechanism 6 to be conveniently installed inside the outer casing 11 between the terminal 111 and the operating end 112, so that the overload protection mechanism 6 can simultaneously accommodate the operating mechanism 2 and the adjustment hole 114 in its assembly position, thus possessing the advantage of a reasonable layout.

[0035] Preferably, the dual-metal component 61 is inclinedly disposed within the housing 11 corresponding to the adjustment hole 114 and the terminal 111, such that one end of the dual-metal component 61 is spaced apart from the operating mechanism 2, and the other end of the dual-metal component 61 is connected to the adjustment screw 62. At the same time, the other end of the dual-metal component 61 is electrically connected to an adjacent terminal 7 through a conductive plate. The inclined dual-metal component 61 makes full use of the space close to the operating mechanism 2, thereby improving space utilization.

[0036] Generally, a contact system and an arc extinguishing system 4 are also provided inside the outer casing 11. The contact system includes a moving contact assembly 31 and a static contact 32 which cooperate with each other. The arc extinguishing system 4 includes an arc extinguishing chamber 41. The incoming arc port of the arc extinguishing chamber 41 is connected to the contact system. One end of the arc extinguishing chamber 41 far from the incoming arc port serves as an exhaust end. The exhaust end faces the terminal 7 and is connected to an air outlet 117 opened on the side wall of the outer casing 11. The bimetal component 61 is arranged along one side of the arc extinguishing chamber 41 connected between the incoming arc port and the exhaust end, so as to avoid arranging the bimetal component 61 between the arc extinguishing chamber 41 and the terminal 7 and prevent the tail gas from interfering with the use of the bimetal component 61.

[0037] Combined with Figure 1-5 A specific embodiment of a circuit breaker is provided.

[0038] The circuit breaker includes an outer casing 11, and the outer casing 11 is in an overall rectangular cavity structure. Figure 1-3 Among them, the opposite ends of the outer casing 11 serve as wiring terminals 111. Operation holes 113 and wiring ports 115 are provided on two side walls of the outer casing 11 adjacent to each wiring terminal 111. The wiring terminal 111 is also provided with an air outlet 117. Preferably, the air outlet 117 and the wiring port 115 are located on the same side wall. The outer casing 11 connected between the two wiring terminals 111 bulges outwards to form an operation end 112, making the outer casing 11 as a whole in a "convex" shape. A handle hole is provided on the end face of the operation end 112. In this embodiment, the central axes of the two wiring ports 115 are parallel to the connection line between the two wiring terminals 111, and the central axes of the operation holes 113 and the handle hole are parallel to the protruding direction of the operation end 112; an adjustment hole 114 is provided on the side wall of the outer casing 11 between one operation end 112 and the wiring terminal 111, and the adjustment hole 114 and the operation hole 113 are located on the same side wall of the outer casing 11.

[0039] An operating mechanism 2 is rotatably assembled inside the outer casing 11. In this embodiment, the operating mechanism 2 is correspondingly arranged inside the operation end 112. The operating mechanism 2 can adopt an existing structure, such as Figure 2 As shown, the operating mechanism 2 includes a lever 21 rotatably assembled. A trip latch 22 and a locking latch 23 are rotatably assembled on the lever 21, and one end of the trip latch 22 and the locking latch 23 are latched and cooperated. The other end of the locking latch 23 is provided with an unlocking portion 234. A return torsion spring 25 is sleeved on the locking latch 23, and both ends of the return torsion spring 25 cooperate with the locking latch 23 and the outer casing 11 respectively, and the return torsion spring 25 provides a return force for the locking latch 23.

[0040] Combined with Figure 2-5 A structure of the locking latch 23 applied to this embodiment is provided.

[0041] Such as Figure 4 、 5As shown, the latch 23 includes a circular plate 230. A latch portion 231 is formed by radially protruding outward from one side edge of the circular plate 230. The latch portion 231 is used to form a latching engagement with the snap fastener 22. The other side edge of the circular body extends along the axial direction of the circular plate 230 to form a connecting plate 233. A cantilever 232 is formed by extending from the edge of the connecting plate 233 in a direction away from the circular plate 230. The cantilever 232 and the latch portion 231 are located on opposite sides of the rotation axis of the latch 23. The cantilever 232 and the circular plate 230 are on two mutually parallel planes. An unlocking portion 234 is provided at the end of the cantilever 232 away from the connecting plate 233. Preferably, the unlocking portion 234 is a convex shaft structure. The unlocking portion 234 is spaced apart from the connecting plate 233 along a plane perpendicular to the plane where the cantilever 232 is located.

[0042] Furthermore, a handle mechanism 8 is also provided inside the outer casing 11. The handle mechanism 8 is linked to the operating mechanism 2. The handle mechanism 8 and the connection between the handle mechanism 8 and the operating mechanism 2 can adopt existing technology. Figure 2 , 3 In this embodiment, the handle mechanism 8 and the operating mechanism 2 are rotatably mounted in the operating end 112. The handle of the handle mechanism 8 extends from the operating hole 113 to the outside of the housing 11 for manually operating the circuit breaker. In this embodiment, a U-shaped connecting rod is connected between the handle mechanism 8 and the lever 21. One end of the U-shaped connecting rod is connected to the handle mechanism 8, and the other end is connected to the lever 21.

[0043] like Figure 1-3 As shown, at least one circuit breaker pole 10 is also provided inside the housing 11. Each circuit breaker pole 10 includes a pair of terminals 7. Each terminal 7 is respectively provided in a terminal 111 of the housing 11. The operation hole 113 and the wiring port 115 of each terminal 111 are respectively corresponding to a terminal 7. A contact system is provided between the pair of terminals 7. The contact system includes a moving contact assembly 31 and a stationary contact 32 that cooperate with each other. The moving contact assembly 31 is driven to connect with the operating mechanism 2. The operating mechanism 2 drives the moving contact assembly 31 to contact or separate from the stationary contact 32, thereby connecting or disconnecting the main line of each circuit breaker pole 10.

[0044] like Figure 2-4As shown, each circuit breaker pole 10 is also connected to an overload protection mechanism 6 on its main line. The overload protection mechanism 6 can adopt existing technology. Typically, the overload protection mechanism 6 includes a bimetallic component 61 and an adjusting screw 62. One end of the bimetallic component 61 is engaged with the operating mechanism 2, and the other end of the bimetallic component 61 is connected to an adjacent terminal 7 through a conductive plate. At the same time, the other end of the bimetallic component 61 is connected to one end of the adjusting screw 62, and the other end of the adjusting screw 62 is engaged with the adjusting hole 114 on the housing 11. By rotating the adjusting screw 62, the distance between the bimetallic component 61 and the operating mechanism 2 is adjusted, thereby setting the current value. When an overload fault occurs, the bimetallic component 61 is heated and bent. The bimetallic component 61 triggers the unlocking part 234 of the latch 23, thereby driving the latch 23 to rotate and disengaging the latch 23 from the trip latch 22.

[0045] In this embodiment, the dual-metal component 61 extends along the direction from the adjustment hole 114 to the operating mechanism 2. Preferably, the dual-metal component 61 is inclinedly disposed within the housing 11. Figure 4 In this configuration, one end of the dual-metal component 61 is stacked on the cantilever 232, such that one end of the dual-metal component 61 is spaced apart from the unlocking part 234. That is, one end of the dual-metal component 61 passes through the gap between the unlocking part 234 and the connecting plate 233, so that the dual-metal component 61 and the unlocking part 234 are spaced apart from each other. The other end of the dual-metal component 61 is connected to an adjusting screw 62. Figure 2 , 4 In the middle, the adjusting screw 62 is connected to the other end of the bimetallic component 61. The adjusting screw 62 corresponds to the adjusting hole 114 on the housing 11. This makes it convenient to operate the adjusting screw 62, and it also eliminates the need for the adjusting screw 62 or the bimetallic component 61 to cross or avoid the terminal 7. This helps to reduce the size of the bimetallic component 61 and the adjusting screw 62. At the same time, the tilted assembly of the bimetallic component 61 can make full use of the space near the operating mechanism 2, thereby improving the space utilization rate.

[0046] When an overload fault occurs, the dual-metal component 61 is heated and bent, triggering the unlocking part 234, which in turn drives the latch 23 to rotate, thereby releasing the latch engagement with the jumper 22. The dual-metal component 61 is stacked on the cantilever 232, which improves the engagement stability between the dual-metal component 61 and the latch 23. The principle of the dual-metal component 61 triggering the operating mechanism 2 to release is existing technology.

[0047] Each circuit breaker pole 10 is also equipped with a contact system, an arc extinguishing system 4, and a circuit breaker protection mechanism 5. The contact system is located between a pair of terminals 7. The arc extinguishing system 4 works in conjunction with the contact system to extinguish the electric arc generated by the contact system opening. The circuit breaker protection mechanism 5 is connected to the main line. In the event of a short circuit fault, the circuit breaker protection mechanism 5 triggers the operating mechanism 2 to trip, ultimately causing the contact system to open and disconnect the power.

[0048] In this embodiment, the contact system adopts a double-break structure, that is, the contact system includes a moving contact assembly 31 and two stationary contacts 32. The moving contact assembly 31 is assembled between the two stationary contacts 32, that is, each stationary contact 32 is located between the moving contact assembly 31 and a terminal 7, and each stationary contact 32 is electrically connected to the adjacent terminal 7. Figure 2 , 3 In the vertical direction, the bimetallic component 61 is located between one of the stationary contacts 32 and the operating mechanism 2. The adjusting screw 62 is located on the side of the bimetallic component 61 facing away from the stationary contact 32. The moving contact component 31 is driven to connect with the operating mechanism 2, and the moving contact component 31 is driven to rotate or move in a straight line by the operating mechanism 2.

[0049] In this embodiment, driven by the operating mechanism 2, the moving contact assembly 31 can move in a straight line (see...). Figure 2 Of course, the moving contact assembly 31 can also be rotatable (see...). Figure 3 ).

[0050] like Figure 2 As shown, the moving contact includes a contact support 310, which is linked to the lever 21 of the operating mechanism 2 via a connecting rod 24. The operating mechanism 2 drives the contact support 310 to move linearly. A moving contact bridge 311 is mounted on the contact support 310. The two ends of the moving contact bridge 311 extend to the opposite sides of the contact support 310 as two moving contacts. Each moving contact is used to cooperate with a stationary contact 32. Two stationary contacts 32 are arranged side by side on opposite sides of the moving contact assembly 31, and both stationary contacts 32 are located between the operating mechanism 2 and the moving contact. A bimetallic assembly 61 is arranged between one of the stationary contacts 32 and the operating mechanism 2. An adjusting screw 62 is located on the side of the bimetallic assembly 61 facing away from the stationary contact 32. Each stationary contact 32 is electrically connected to the adjacent terminal 7.

[0051] like Figure 3 As shown, the moving contact includes a rotating shaft 312, which is rotatably disposed in the middle of the housing 11 and rotates around the rotation axis of the rotating shaft 312. A moving contact bridge 311 is provided in the middle of the rotating shaft 312 along the radial direction of the rotating shaft 312. The two ends of the moving contact bridge 311 extend outside the rotating shaft 312 as two moving contact parts. Each moving contact part cooperates with a stationary contact 32. The two stationary contacts 32 are arranged in rotational symmetry on opposite sides of the moving contact assembly 31. One stationary contact 32 is closer to the operating mechanism 2, and the other stationary contact 32 is farther away from the operating mechanism 2. The bimetallic assembly 61 is located between the operating mechanism 2 and the stationary contact 32 close to the operating mechanism 2. Each stationary contact 32 is electrically connected to the adjacent terminal 7.

[0052] like Figure 2 , 3As shown, the arc extinguishing system 4 includes two spaced-apart arc extinguishing chambers 41. The moving contact assembly 31 rotates or moves between the two arc extinguishing chambers 41. Each stationary contact 32 and one end of the moving contact assembly 31 are spaced apart at the arc inlet of one arc extinguishing chamber 41, wherein the movement trajectory of the moving contact assembly 31 corresponds to the arc inlet, as shown. Figure 2 , 3 As shown, each stationary contact 32 is positioned in conjunction with an arc-extinguishing chamber 41 near the operating mechanism 2; or, one stationary contact 32 is positioned in conjunction with an arc-extinguishing chamber 41 near the operating mechanism 2, and the other stationary contact 32 is positioned in conjunction with another arc-extinguishing chamber 41 on the side away from the operating mechanism 2; each stationary contact 32 is connected to an adjacent terminal 7 via a stationary contact plate or a conductive plate, and the stationary contact plate or conductive plate extends along the side of each arc-extinguishing chamber 41 to avoid occupying too much space.

[0053] Furthermore, the arc extinguishing system 4 also includes an outlet 117, which is preferably located on the side wall of the housing 11 at the terminal 111. The end of the arc extinguishing chamber 41 away from the arc inlet is the exhaust end, which can directly correspond to the exhaust port, thereby allowing the exhaust gas to be discharged. Preferably, the arc extinguishing system 4 also includes an exhaust channel 42, which is connected between the exhaust end and the outlet 117, so that the exhaust gas discharged from the arc extinguishing chamber 41 is buffered by the exhaust channel 42 before being discharged from the housing 11. Preferably, the exhaust gas flowing into the exhaust channel 42 is preferably discharged after changing direction multiple times, so that the exhaust gas is fully cooled. For example, multiple blocking parts 421 can be provided in the exhaust channel 42. Each blocking part 421 can block metal ions in the exhaust gas by changing the flow direction of the exhaust gas, thereby preventing the direct discharge of the exhaust gas from causing environmental pollution.

[0054] Each circuit breaker pole 10 can also be connected to a circuit breaker protection mechanism 5 on its main line. The circuit breaker protection mechanism 5 adopts existing technology and can be a solenoid-type trip unit or a snap-action trip unit. In this embodiment, the circuit breaker protection mechanism 5 adopts a smaller snap-action trip unit, which helps to save internal space. Figure 2 In the circuit breaker protection mechanism 5, there are usually two opposing magnetic yokes and armatures. A conductive plate connected to the terminal 7 passes through the gap between the magnetic yoke and the armature. When the short-circuit current flows through the conductive plate, the armature is driven to move closer to the magnetic yoke, thereby triggering the unlocking part 234 of the operating mechanism 2, which causes the latch 23 and the trip latch 22 to disengage and disconnect the power.

[0055] In this embodiment, only one circuit breaker pole 10 is used as an example. Multiple circuit breaker poles 10 can also be provided inside the housing 11. At least one circuit breaker pole 10 is provided with an overload protection mechanism 6. In addition, the number of operating mechanisms 2 can be one or more. That is, when the number of circuit breaker poles 10 is two or more, each circuit breaker pole 10 can be configured with one operating mechanism 2, or all circuit breaker poles 10 can share one operating mechanism 2.

[0056] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0057] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A circuit breaker, comprising a housing (11), wherein both ends of the housing (11) are respectively used as terminals (111), and terminals (7) are provided inside the terminals (111), the terminals (7) corresponding to the operating holes (113) and wiring ports (115) opened on the terminals (111), an operating mechanism (2) is provided inside the housing (11), and an overload protection mechanism (6) is provided inside the housing (11) between the operating mechanism (2) and one terminal (111), the overload protection mechanism (6) comprising a bimetallic component (61) and an adjusting screw (62), the bimetallic component (61) cooperating with the operating mechanism (2), characterized in that: The housing (11) between the operating hole (113) and the operating mechanism (2) is provided with an adjustment hole (114), and the adjustment hole (114) and the operating hole (113) are located on the same side wall of the housing (11), so that one end of the adjusting screw (62) corresponds to the adjustment hole (114), and the other end is connected to the double metal assembly (61) to adjust the distance between the double metal assembly (61) and the operating mechanism (2).

2. The circuit breaker according to claim 1, characterized in that: The outer casing (11) connected between the two terminals (111) protrudes outward to form an operating end (112). The operating mechanism (2) is located inside the operating end (112). The adjustment hole (114) is located between one terminal (111) and the operating end (112).

3. The circuit breaker according to claim 1, characterized in that: The double metal component (61) extends obliquely along the direction from the adjustment hole (114) to the operating mechanism (2), such that one end of the double metal component (61) is spaced opposite to the operating mechanism (2), and the other end of the double metal component (61) is connected to the adjacent terminal (7) through the conductive plate (70). The adjustment screw (62) is connected to the other end of the double metal component (61).

4. The circuit breaker according to claim 1, characterized in that: It also includes an arc-extinguishing chamber (41), and the dual-metal assembly (61) is disposed between the arc-extinguishing chamber (41) and the operating mechanism (2).

5. The circuit breaker according to claim 4, characterized in that: One end of the arc-extinguishing chamber (41) is provided with an arc inlet, and the other end of the arc-extinguishing chamber (41) away from the arc inlet is the exhaust end. The double metal assembly (61) is arranged along one side between the arc inlet and the exhaust end of the arc-extinguishing chamber (41).

6. The circuit breaker according to claim 5, characterized in that: The exhaust end is opposite to the adjacent terminal (7), the terminal (111) is provided with an air outlet (117), and an exhaust channel (42) is connected between the exhaust end and the air outlet (117).

7. The circuit breaker according to claim 1, characterized in that: The operating mechanism (2) includes a lever (21) with a rotating assembly. A snap fastener (22) and a lock fastener (23) are rotatably mounted on the lever (21). The snap fastener (22) and the lock fastener (23) are fastened together. The lock fastener (23) is provided with an unlocking part (234). The unlocking part (234) is triggered by the double metal component (61) to release the lock fastener (23) from the snap fastener (22).

8. The circuit breaker according to claim 7, characterized in that: One end of the latch (23) is provided with a buckle part (231), which is engaged with the snap buckle (22). The other end of the latch (23) is provided with a cantilever (232), which is located on opposite sides of the rotation axis of the latch (23). The cantilever (232) is provided with an unlocking part (234).

9. The circuit breaker according to claim 8, characterized in that: One end of the dual-metal component (61) is stacked with the cantilever (232), and the unlocking part (234) protrudes outward along the plane perpendicular to the cantilever (232), so that one end of the dual-metal component (61) and the unlocking part (234) are spaced apart and opposite to each other.

10. The circuit breaker according to claim 1, characterized in that: The housing (11) is also provided with a contact system, which includes a moving contact assembly (31) and two stationary contacts (32). The moving contact assembly (31) is disposed between two terminals (111) and drivenly connected to the operating mechanism (2). Each stationary contact (32) is located between the moving contact assembly (31) and an adjacent terminal (7). The bimetallic assembly (61) is located between one of the stationary contacts (32) and the operating mechanism (2). The adjusting screw (62) is located on the side of the bimetallic assembly (61) facing away from the stationary contact (32).

11. The circuit breaker according to claim 10, characterized in that: The moving contact assembly (31) includes a rotating shaft (312) driven to rotate by the operating mechanism (2). A moving contact bridge (311) is provided in the middle of the rotating shaft (312) along the radial direction of the rotating shaft (312). The two ends of the moving contact bridge (311) extend outside the rotating shaft (312) as two moving contact portions. Each moving contact portion cooperates with a stationary contact (32). Alternatively, the moving contact assembly (31) includes a contact support (310), which is driven to move in a straight line by an operating mechanism (2). The contact support (310) is provided with a moving contact bridge (311), the two ends of which extend to opposite sides of the contact support (310) as two moving contact portions, each moving contact portion cooperating with a stationary contact (32).

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