circuit breaker

Abstract

A circuit breaker includes a housing and at least two parallel circuit breaker poles. Each circuit breaker pole includes a housing, a contact system, and a protection mechanism. The contact system includes a moving contact assembly and a stationary contact. An operating mechanism is provided within the housing of at least one of the circuit breaker poles. The protection mechanism is laterally arranged between the corresponding operating mechanism and the stationary contact and extends towards the operating mechanism. The protection mechanism includes a short-circuit protection mechanism and an overload protection mechanism. The short-circuit protection mechanism and the overload protection mechanism are arranged side by side and distributed on opposite sides of the operating mechanism, or the short-circuit protection mechanism and the overload protection mechanism are arranged side by side on the same side of the operating mechanism. In this invention, the operating mechanism is provided in at least one circuit breaker pole, so that the operating mechanism forms a modular structure with at least one circuit breaker pole, thereby facilitating assembly with other circuit breakers. The protection mechanism makes full use of the space between the stationary contact and the operating mechanism, and also helps to reduce the overall width of the circuit breaker.

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, as well as to disconnect faulty circuits to prevent the escalation of accidents and thus ensure the safe operation of load circuits. In existing circuit breakers, each circuit breaker pole is equipped with a protection mechanism. Typically, the short-circuit protection mechanism and the overload protection mechanism are located in the same circuit breaker pole to accommodate more power distribution systems. This structure has the following drawbacks: First, the operating mechanism has many components and a complex structure. It is usually assembled separately in the housing. Due to the complex cooperation between the operating mechanism and the circuit breaker pole, it is not conducive to forming a modular structure, resulting in assembly inconvenience. Second, the short-circuit protection mechanism and the overload protection mechanism are usually located between the arc-extinguishing system and an adjacent terminal, making the overall width of the circuit breaker larger. In particular, when the short-circuit protection mechanism and the overload protection mechanism are adjacent to different terminals and are distributed on opposite sides of the arc-extinguishing system, the overall width of the circuit breaker is further increased. Summary of the Invention

[0003] The purpose of this utility model 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, within which at least two circuit breaker poles are arranged side by side. Each circuit breaker pole includes a housing, and within the housing are a contact system and a protection mechanism. The contact system includes a cooperating moving contact assembly and a stationary contact. An operating mechanism is provided within the housing of at least one of the circuit breaker poles. The protection mechanism is laterally arranged between the corresponding operating mechanism and the stationary contact and extends towards the operating mechanism. The protection mechanism includes a short-circuit protection mechanism and an overload protection mechanism. The short-circuit protection mechanism and the overload protection mechanism are arranged side by side along a first direction and distributed on opposite sides of the operating mechanism, or the short-circuit protection mechanism and the overload protection mechanism are arranged side by side along a third direction on the same side of the operating mechanism, with the first direction perpendicular to the third direction.

[0006] Preferably, each circuit breaker pole has an operating mechanism installed in its housing, which is triggered by a protection mechanism located in the same housing to trip; one circuit breaker pole has an operating mechanism installed in its housing, and the protection mechanisms of all circuit breaker poles cooperate with the same operating mechanism to trigger the tripping of the operating mechanism.

[0007] Preferably, one of the circuit breaker poles serves as a short-circuit protection pole, and the protection mechanism of the short-circuit protection pole includes only a short-circuit protection mechanism; the other circuit breaker pole serves as an overload protection pole, and the protection mechanism of the overload protection pole includes only an overload protection mechanism.

[0008] Preferably, each circuit breaker pole further includes an arc extinguishing system, the arc extinguishing system including at least one arc extinguishing chamber, one end of the arc extinguishing chamber having an arc inlet, and the other end of the arc extinguishing chamber away from the arc inlet having an exhaust end, the stationary contact having at least a portion stacked with the arc extinguishing chamber in a third direction, and extending in a first direction along the outer side wall of the arc extinguishing chamber connecting the arc inlet and the exhaust end.

[0009] Preferably, the arc extinguishing system includes two arc extinguishing chambers, with the arc inlets of the two arc extinguishing chambers spaced apart and facing each other in a first direction. The contact system is disposed between the two arc extinguishing chambers. In the first direction, the operating mechanism and one arc extinguishing chamber are located on the same side of the contact system, and the operating mechanism and the arc extinguishing chamber on the same side are disposed in a second direction, which is perpendicular to the first direction and the third direction, respectively.

[0010] Preferably, the contact system includes a moving contact assembly and two stationary contacts. The moving contact assembly is driven and connected to the operating mechanism. In a first direction, one stationary contact is located on the same side as the operating mechanism. In a second direction, the operating mechanism, an arc-extinguishing chamber on the same side, and one stationary contact are arranged in sequence, and another stationary contact is located between the operating mechanism and another arc-extinguishing chamber, so that the two stationary contacts are arranged in a rotationally symmetrical structure on opposite sides of the moving contact assembly.

[0011] Preferably, the operating mechanism includes a lever, a jump buckle, and a locking buckle. The lever is rotatably assembled, and the jump buckle and locking buckle are respectively stacked and rotatably assembled on the lever. The locking buckle and the jump buckle are fastened together. The locking buckle is provided with an unlocking part. The unlocking part is triggered by the short circuit protection mechanism and the overload protection mechanism respectively, so that the locking buckle and the jump buckle are released from the fastening engagement.

[0012] Preferably, the operating mechanism is disposed within the housing of one circuit breaker pole, and the unlocking part is disposed through the housings of all circuit breaker poles; alternatively, the unlocking part extends out of the housing and cooperates with the short-circuit protection mechanism and / or overload protection mechanism of the remaining circuit breaker poles within the outer casing.

[0013] Preferably, the operating mechanism is disposed within the housing of each circuit breaker pole, the unlocking part is located within the housing of each circuit breaker pole, and adjacent operating mechanisms are linked together.

[0014] Preferably, the housing has a through hole in the middle, through which the armature of the short-circuit protection mechanism or the bimetallic component of the overload protection mechanism inside the housing passes. At least one part of the middle of the housing protrudes outward to form a mounting part for assembling the operating mechanism. At least part of the unlocking part of the operating mechanism protrudes outside the mounting part and is adjacent to the through hole, so that the unlocking part cooperates with the armature and / or bimetallic component of the other circuit breaker poles.

[0015] Preferably, both ends of the housing serve as wiring terminals, and the housing connected between the two wiring terminals forms an operating end along the outer side of the mounting portion. The housing connected between the wiring terminals and the operating end is provided with an operating hole.

[0016] The outer casing and / or housing is provided with an adjustment hole, and the adjustment hole is located on the side wall of the outer casing and / or housing between the operating hole and the operating end, so that the adjustment screw of the overload protection mechanism corresponds to the adjustment hole.

[0017] Preferably, it also includes a handle mechanism arranged side by side with the operating mechanism. The handle mechanism is linked to the operating mechanism and is jointly arranged in the mounting part. The mounting part and the operating end are provided with corresponding handle holes. The handle part of the handle mechanism extends out of the outer shell from the handle hole.

[0018] Preferably, the middle of each housing protrudes outward to form a mounting part, and each mounting part is provided with an operating mechanism. The short-circuit protection mechanism or overload protection mechanism in the same housing cooperates with the operating mechanism, and the operating mechanisms of two adjacent circuit breaker poles are linked together.

[0019] Preferably, the short-circuit protection mechanism includes a magnetic yoke, an armature, and a conductive plate. The armature and the magnetic yoke are spaced apart. The conductive plate passes through the conductor cavity formed between the armature and the magnetic yoke. The head end of the armature is rotatably assembled, and the tail end of the armature is used to trigger the operating mechanism to trip.

[0020] Preferably, the overload protection mechanism includes a bimetallic component and an adjusting screw. One end of the bimetallic component cooperates with the operating mechanism, and the other end of the bimetallic component is connected to one end of the adjusting screw. The other end of the adjusting screw corresponds to an adjusting hole opened on the housing.

[0021] The circuit breaker of this utility model has an operating mechanism in at least one of the circuit breaker poles, so that the operating mechanism forms a modular structure with at least one circuit breaker pole, which facilitates assembly with other circuit breakers. At the same time, the protection mechanism makes full use of the space between the stationary contact and the operating mechanism, which not only improves the space utilization rate, but also helps to reduce the overall width of the circuit breaker.

[0022] In addition, when only one operating mechanism is set, the unlocking part of the operating mechanism extends out of the housing and cooperates with the short-circuit protection mechanism and overload protection mechanism of the other circuit breaker poles. When an operating mechanism is set in each circuit breaker pole, adjacent operating mechanisms are linked together. The assembly method of the operating mechanism can meet different needs and has a wide range of applications.

[0023] Furthermore, in applications where grounding systems are not considered, circuit breakers can simplify protection mechanisms, forming short-circuit protection and overload protection, avoiding the need for too many protection mechanisms on the same circuit, which helps reduce costs and manufacturing complexity. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the circuit breaker of this utility model;

[0025] Figure 2 This is a schematic diagram of the circuit breaker of this utility model after the cover is opened;

[0026] Figure 3 This is a schematic diagram of the internal structure of the circuit breaker pole after the overload protection mechanism has been removed.

[0027] Figure 4 This is a schematic diagram of the internal structure of the circuit breaker pole after the short-circuit protection mechanism has been removed.

[0028] Figure 5 This is a schematic diagram of the internal structure of the circuit breaker poles of this utility model after the overload protection mechanism has been removed (excluding the housing);

[0029] Figure 6 This is a schematic diagram of the internal structure of the circuit breaker poles of this utility model after the short-circuit protection mechanism has been removed (excluding the housing);

[0030] Figure 7 This is a schematic diagram of the internal structure of the short-circuit protection mechanism and the overload protection mechanism arranged in parallel in this utility model;

[0031] Figure 8 This is a schematic diagram of the structure in which the short-circuit protection mechanism and the overload protection mechanism are arranged side by side in this utility model;

[0032] Figure 9 This is a schematic diagram of the short-circuit protection mechanism in this utility model;

[0033] Figure 10 yes Figure 9 The main view;

[0034] Figure 11 This is a schematic diagram of the overload protection mechanism in this utility model;

[0035] Figure label:

[0036] 10-Circuit breaker pole, 101-Short circuit protection pole, 102-Overload protection pole, 11-Housing, 111-Terminal, 112-Operating terminal, 113-Operating hole, 114-Adjusting hole, 115-Wiring port, 116-Handle hole, 117-Air outlet, 1101-Base, 1102-Cover, 125-Through hole, 2-Operating mechanism, 234-Unlocking part, 31-Moving contact assembly, 310-Contact support, 311 - Moving contact bridge, 312- Rotating shaft, 32- Stationary contact, 320- Stationary contact plate, 321- First stationary contact, 322- Second stationary contact, 41- Arc extinguishing chamber, 42- Exhaust channel, 43- Stationary arc ignition plate, 5- Short circuit protection mechanism, 50- Bracket, 51- Magnetic yoke, 52- Armature, 53- Elastic element, 6- Overload protection mechanism, 61- Bimetallic component, 62- Adjusting screw, 7- Terminal block, 70- Conductive plate, 8- Handle mechanism. Detailed Implementation

[0037] 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.

[0038] The circuit breaker includes a housing 11, within which an operating mechanism 2 and at least two parallel circuit breaker poles 10 are disposed. Each circuit breaker pole 10 includes a pair of spaced-apart terminals 7, and a contact system is connected 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 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. The contact system is also equipped with an arc extinguishing system, which extinguishes the electric arc generated when the contact system breaks.

[0039] Preferably, the circuit breaker pole 10 is also provided with a protection mechanism, which includes a short-circuit protection mechanism 5 and / or an overload protection mechanism 6. The short-circuit protection mechanism 5 and the overload protection mechanism 6 are respectively connected to the main line of the circuit breaker pole 10 and cooperate with the operating mechanism 2. When a short-circuit fault occurs, the short-circuit protection mechanism 5 triggers the operating mechanism 2 to trip. When an overload fault occurs, the overload protection mechanism 6 triggers the operating mechanism 2 to trip.

[0040] Typically, each circuit breaker pole 10 includes a housing, which provides assembly space for the contact system, arc extinguishing system, and protection mechanism. The terminals 7 of each circuit breaker pole 10 can be located inside the housing or in the outer casing 11. The housing allows the circuit breaker poles 10 to form a modular structure, which is convenient for assembly in the outer casing 11. Of course, it is also possible to not provide a housing and separate adjacent circuit breaker poles 10 by a partition located in the outer casing 11.

[0041] For ease of description, the length, height, and width of the circuit breaker are used to represent the first direction, the second direction, and the third direction, respectively. Figure 1 As shown, the direction of the X-axis is the first direction, the direction of the Y-axis is the second direction, and the direction of the Z-axis is the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0042] The improvement of this application is that an operating mechanism 2 is provided in the housing of at least one of the circuit breaker poles 10. The protection mechanism is arranged laterally between the corresponding operating mechanism 2 and the stationary contact 32 and extends towards the operating mechanism 2. The protection mechanism includes a short-circuit protection mechanism 5 and an overload protection mechanism 6. The short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side along a first direction and distributed on opposite sides of the operating mechanism 2. Alternatively, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side along a third direction on the same side of the operating mechanism 2.

[0043] Thus, the operating mechanism 2 is installed in at least one of the circuit breaker poles 10, forming a modular structure with at least one circuit breaker pole 10. This facilitates assembly with other circuit breakers. Simultaneously, the protection mechanism fully utilizes the space between the stationary contact 32 and the operating mechanism 2, improving space utilization and reducing the overall width of the circuit breaker. It also avoids installing too many protection mechanisms in the same circuit, reducing cost and manufacturing complexity. Specifically, the protection mechanism is arranged approximately parallel to the first direction and extends towards the operating mechanism 2. This can be understood as the protection mechanism being laterally positioned between the stationary contact 32 and the operating mechanism 2, shortening the cooperation distance between them and improving cooperation stability. Furthermore, it avoids placing the protection mechanism between the terminal 7 and the arc-extinguishing chamber 41, further reducing the overall width of the circuit breaker.

[0044] like Figure 3-7 As shown, in the first direction, the protection mechanism can be disposed on one side of the operating mechanism 2, that is, the protection mechanism is disposed on one side of the operating mechanism 2 along a direction approximately parallel to the first direction, and the protection mechanism extends towards the operating mechanism 2. The short-circuit protection mechanism 5 and the overload protection mechanism 6 are disposed side by side in the third direction, so that the short-circuit protection mechanism 5 and the overload protection mechanism 6 are located on the same side of the operating mechanism 2 in the first direction; or, as Figure 8 As shown, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side. In the first direction, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are respectively arranged on opposite sides of the operating mechanism 2.

[0045] Furthermore, in applications where grounding systems are not considered, the protection mechanisms in each circuit breaker pole 10 can be simplified to avoid having too many protection mechanisms on the same circuit, thus saving costs and simplifying assembly. For example, one circuit breaker pole 10 can serve as a short-circuit protection pole 101, and the protection mechanism of the short-circuit protection pole 101 can only include the short-circuit protection mechanism 5. The other circuit breaker pole 10 can serve as an overload protection pole 102, and the protection mechanism of the overload protection pole 102 can only include the overload protection mechanism 6.

[0046] Furthermore, the circuit breaker may have only one operating mechanism 2, which is located in one of the housings. The unlocking part 234 of the operating mechanism 2, which cooperates with the protection mechanism, extends from the housing. The unlocking part 234 may be installed through all the housings along a third direction, or the unlocking part 234 may be located in the outer shell 11 outside the other housings, so that the short-circuit protection mechanism 5 and overload protection mechanism 6 of the other circuit breaker poles 10 can cooperate with the unlocking part 234. Of course, the circuit breaker may also be equipped with two or more operating mechanisms 2. Preferably, the number of operating mechanisms 2 is the same as the number of circuit breaker poles 10. Thus, an operating mechanism 2 can be installed in each housing, and the operating mechanisms 2 of two adjacent circuit breaker poles 10 are linked together. The unlocking part 234 of the operating mechanism 2 is located in each housing. The assembly method of the operating mechanism 2 can meet different needs and has a wide range of applications.

[0047] Combination Figure 1-7 9-11 provides a specific embodiment of a circuit breaker.

[0048] like Figure 1 As shown, the circuit breaker includes a housing 11, at least one operating mechanism 2, and at least two circuit breaker poles 10. The opposite ends of the housing 11 serve as terminals 111. Each terminal 111 is provided with an operating hole 113 and a connection port 115. The central axis of the connection port 115 is parallel to a first direction, and the central axis of the operating hole 113 is parallel to a second direction. The side wall of the housing 11 connecting the two terminals 111 protrudes outward to form an operating end 112. That is, the side wall of the housing 11 connecting the two terminals 111 protrudes outward along the second direction to form an operating end 112. The operating end 112 is provided with a handle hole 116, and the central axis of the handle hole 116 is parallel to the second direction. It should be noted that when there are two or more operating holes 113 on the same terminal 111, two adjacent operating holes 113 are arranged side by side in the third direction. Correspondingly, when there are two or more handle holes 116, they are also arranged side by side in the third direction. Furthermore, the outer casing 11 of this embodiment includes a cover 1102 and a base 1101. The cover 1102 covers the base 1101, and the operating mechanism 2 and the circuit breaker pole 10 are disposed together between the cover 1102 and the base 1101.

[0049] like Figure 1-4 As shown, each circuit breaker pole 10 includes a housing, and at least one housing protrudes outward along a second direction from the middle of one side to form a mounting portion, which is correspondingly disposed in the operating end 112 of the housing 11. The mounting portion and the operating end 112 are respectively provided with a handle hole 116; at least one housing is provided with an adjustment hole 114, which is corresponding to the housing side wall between the mounting portion and the operating hole 113, and the central axis of the adjustment hole 114 is parallel to the second direction.

[0050] like Figure 1 , 2 As shown, two housings are arranged side by side in the third direction inside the outer casing 11. Each housing is provided with a mounting part, and an operating mechanism 2 is provided in the mounting part. The operating mechanism 2 includes a lever, a jump buckle, and a lock. The lever is rotated and assembled. The jump buckle and the lock are respectively stacked and rotated on the lever in the third direction. One end of the lock engages with the jump buckle, and the other end of the lock is provided with an unlocking part 234. The unlocking part 234 does not need to extend out of its respective housing. It only needs to ensure that the two adjacent operating mechanisms 2 are linked and connected.

[0051] Furthermore, the operating mechanism 2 is also linked to a handle mechanism 8. The handle mechanism 8 and the operating mechanism 2 are rotatably assembled in the same mounting part. The handle mechanism 8 and the operating mechanism 2 are arranged side by side in the first direction. The handle mechanism 8 can adopt existing technology. The handle mechanism 8 is linked to the lever of the operating mechanism 2 through a U-shaped connecting rod. The handle part of the handle mechanism 8 passes through the handle hole 116 of the mounting part and the operating end 112 and extends out of the outer shell 11 for manually operating the circuit breaker from the outside.

[0052] like Figure 1-7As shown, each circuit breaker pole 10 includes a pair of terminals 7, which are spaced apart and correspondingly disposed within the housing 11 outside the two ends of the housing in a first direction. Each terminal 7 corresponds to an operating hole 113 and a wiring port 115 of the terminal 111. A contact system and an arc extinguishing system are disposed within the housing between the pair of terminals 7. The contact system includes a rotating shaft 312 and two stationary contacts 32. The rotating shaft 312 is rotatably disposed in the middle of the housing and has a contact cavity in the middle of the rotating shaft 312. The contact cavity is arranged radially along the rotating shaft 312. A moving contact bridge 311 is disposed in the middle of the rotating shaft 312, with both ends of the moving contact bridge 311 serving as moving contact portions. Each moving contact portion extends beyond the rotating shaft 312. The two stationary contacts 32 are arranged in a spiral configuration. The stationary contacts 32 are symmetrically arranged on opposite sides of the moving contact assembly 31. For ease of description, the two stationary contacts 32 are divided into a first stationary contact 321 and a second stationary contact 322. In the first direction, the first stationary contact 321 and the second stationary contact 322 are located on opposite sides of the moving contact assembly 31, wherein the first stationary contact 321 and the operating mechanism 2 are located on opposite sides of the moving contact assembly 31, and the second stationary contact 322 and the operating mechanism 2 are located on the same side of the moving contact assembly 31. In the second direction, the first stationary contact 321 is closer to the operating mechanism 2, and the second stationary contact 322 is farther away from the operating mechanism 2. That is, the first stationary contact 321 is located between the moving contact assembly 31 and the operating mechanism 2, and the second stationary contact 322 and the operating mechanism 2 are located between the moving contact assembly 31.

[0053] like Figure 3-7 As shown, the arc-extinguishing system includes two arc-extinguishing chambers 41, with their inlets spaced apart and facing each other in a first direction. In the figure, the two arc-extinguishing chambers 41 are arranged side-by-side in a direction slightly angled to the first direction. The exhaust end of each arc-extinguishing chamber 41 faces away from its inlet and towards the adjacent terminal 7. A contact system is fitted between the two arc-extinguishing chambers 41. In the first direction, one arc-extinguishing chamber 41 and the operating mechanism 2 are located on opposite sides of the contact system, while the other arc-extinguishing chamber 41 and the operating mechanism 2 are located on the same side of the contact system. The first stationary contact 321 corresponds to one arc-extinguishing chamber 41 and is close to the operating mechanism. At one end of the structure 2, the second stationary contact 322 corresponds to the other end of the arc-extinguishing chamber 41 away from the operating mechanism 2. That is, the operating mechanism 2, the arc-extinguishing chamber 41 on the same side, and the second stationary contact 322 are arranged sequentially in the second direction. The first stationary contact 321 is located between the operating mechanism 2 and the other arc-extinguishing chamber 41 in the second direction, so that the first stationary contact 321 and the second stationary contact 322 form a rotationally symmetrical structure. Each stationary contact 32 is at least partially stacked with the arc-extinguishing chamber 41 in the second direction, and extends along the outer wall of the arc-extinguishing chamber 41 connecting the arc inlet and the exhaust end in the first direction.

[0054] Additionally, the arc-extinguishing system may also include an exhaust channel 42, which connects the exhaust end of each arc-extinguishing chamber 41 to an exhaust port disposed on the housing. The exhaust port corresponds to the air outlet 117 on the housing 11. In this embodiment, the air outlet 117 is disposed at the terminal 111, and the air outlet 117 and the terminal 115 are located on the same side wall of the housing 11. Figure 3 , 4 In the second direction, the exhaust port of one terminal 111 is located below the terminal 7 on the same end. In the third direction, the exhaust port of the other terminal 11 is arranged side by side with the terminal 7 on the same end. The exhaust gas discharged from the arc-extinguishing chamber 41 is buffered and cooled by the exhaust channel 42 and then discharged from the outlet 117 to avoid the high-temperature exhaust gas being directly discharged from the circuit breaker.

[0055] Furthermore, the arc-extinguishing system also includes an arc-initiating structure, which is located at the arc inlet and cooperates with the contact system. In this embodiment, the arc-initiating structure includes a moving arc-initiating part and a stationary arc-initiating plate 43. The moving arc-initiating part is preferably disposed on the moving contact assembly 31, and the stationary arc-initiating plate 43 cooperates with the stationary contact 32. That is, one end of the stationary arc-initiating plate 43 is connected to the stationary contact plate 320 with a stationary contact point, and the other end extends into the arc-extinguishing chamber 41. Of course, in this embodiment, the arc-extinguishing system can also adopt existing technology.

[0056] like Figure 2-4 As shown in Figures 9 and 10, in this embodiment, each circuit breaker pole 10 is also provided with a protection mechanism. In the second direction, the operating mechanism 2, the protection mechanism and the stationary contact 32 are arranged in sequence. The protection mechanism is connected to the main line of each circuit breaker pole through the middle of the stationary contact plate of the first stationary contact 321, and the protection mechanism is located on the side of the stationary contact plate of the first stationary contact 321 that is away from the arc extinguishing chamber 41.

[0057] The protection mechanism includes a short-circuit protection mechanism 5 and an overload protection mechanism 6 arranged side by side in the third direction. In the first direction, the protection mechanism is located on the same side of the operating mechanism 2 and extends along the direction close to the operating mechanism 2. It can also be understood that the short-circuit protection mechanism 5 and the overload protection mechanism 6 in the protection mechanism are arranged laterally. The extension direction of the short-circuit protection mechanism 5 and the overload protection mechanism 6 is approximately parallel to the first direction, which facilitates cooperation with the operating mechanism 2.

[0058] In this embodiment, if applications such as grounding systems are not considered, the protection mechanism within each circuit breaker pole 10 can be further simplified. At least one circuit breaker pole 10 serves as a short-circuit protection pole 101, and its protection mechanism includes only a short-circuit protection mechanism 5. The other circuit breaker pole 10 serves as an overload protection pole 102, and its protection mechanism includes only an overload protection mechanism 6. The short-circuit protection mechanism 5 and the overload protection mechanism 6 are respectively connected to the main lines of the two circuit breaker poles 10. The short-circuit protection mechanism 5 and the overload protection mechanism 6 can be coupled to adjacent terminals 7 to be connected to the main line of their respective circuit breaker poles 10. The short-circuit protection pole 101 and the overload protection pole 102 are used in series. When a short-circuit fault occurs, the short-circuit protection mechanism 5 triggers the operating mechanism 2 to trip. When an overload fault occurs, the overload protection mechanism 6 triggers the operating mechanism 2 to trip. By simplifying the protection mechanism in each circuit breaker pole 10, too many protection mechanisms connected in the same circuit can be avoided, which helps to reduce costs and simplify assembly.

[0059] Specifically, such as Figure 3 As shown, the operating mechanism 2 is configured within each circuit breaker pole, that is, an operating mechanism 2 is installed within the housing. Regardless of whether the protection mechanism is simplified, in the first direction, the short-circuit protection mechanism 5 and the operating mechanism 2 are located on opposite sides of the moving contact assembly 31, respectively. In the second direction, the short-circuit protection mechanism 5 is located between the first stationary contact 321 and the operating mechanism 2. It can also be understood that the short-circuit protection mechanism 5 is located between the first stationary contact 321 and the handle mechanism 8, except that the distance between the short-circuit protection mechanism 5 and the handle mechanism 8 is greater than the distance between the short-circuit protection mechanism 5 and the operating mechanism 2. The short-circuit protection mechanism 5 extends approximately along the first direction from the outer wall of the adjacent arc-extinguishing chamber 41 (the side wall of the arc-extinguishing chamber 41 connecting the arc inlet and the exhaust end) towards the operating mechanism 2. It can also be understood that the short-circuit protection mechanism 5 is laterally arranged between the handle mechanism 8 and the first stationary contact 321. At this time, the short-circuit protection mechanism 5 is arranged in a direction approximately parallel to the first direction, and the armature 52 of the short-circuit protection mechanism 5 extends towards the operating mechanism 2.

[0060] like Figure 2 , 3As shown in Figures 5-7, 9, and 10, the short-circuit protection mechanism 5 includes a magnetic yoke 51, an armature 52, a conductive plate 70, and a support 50. The magnetic yoke 51 and the armature 52 are spaced apart and opposite each other in the second direction, forming a conductive cavity between them. The conductive plate 70 passes through the conductive cavity and can connect to adjacent terminals 7 and / or adjacent first stationary contacts 321. In the second direction, the armature 52 is disposed on the side of the first stationary contact 321 facing away from the moving contact assembly 31. The head end of the armature 52 is rotatably connected to the bracket 50. The armature 52 extends towards the operating mechanism 2, so that the tail end of the armature 52 engages with the unlocking part 234. When a short-circuit current flows through the conductive plate 70, the magnetic yoke 51 and the armature 52 engage to generate a magnetic field. This magnetic field drives the tail end of the armature 52 to trigger the unlocking part 234, causing the latch and the jumper to disengage. An elastic element 53 is connected between the bracket 50 and the armature 52, and the elastic element 53 provides a reset force for the armature 52 to reset.

[0061] Preferably, the armature 52 extends at an angle toward the latch, and the angle between the extension direction of the armature 52 and the first direction is between 10° and 30°. The slightly inclined setting of the armature 52 can ensure the cooperation between the armature 52 and the latch, and also avoid occupying too much space between the operating mechanism 2 and the stationary contact 32.

[0062] In addition, the stationary contact plate 320 of the first stationary contact 321 can pass through the conductor cavity between the magnetic yoke 51 and the armature 52 as a conductive plate 70, thereby eliminating the need for a conductive plate 70 and saving internal space.

[0063] like Figure 2 , 4 As shown in Figures 6 and 11, in the first direction, the overload protection mechanism 6 and the operating mechanism 2 are located on opposite sides of the moving contact assembly 31, respectively. In the second direction, the overload protection mechanism 6 is located between the first stationary contact 321 and the operating mechanism 2. Of course, the overload protection mechanism 6 is also located in the space between the handle mechanism 8 and the first stationary contact 321, but the distance between the overload protection mechanism 6 and the handle mechanism 8 is greater than the distance between the overload protection mechanism 6 and the operating mechanism 2. The overload protection mechanism 6 extends approximately along a direction at an angle to the first direction from the side wall of the adjacent arc-extinguishing chamber 41 (the side wall of the arc-extinguishing chamber 41 connecting the arc inlet and the exhaust end) towards the operating mechanism 2.

[0064] Figure 2 , 4In 6 and 11, the overload protection mechanism 6 includes a bimetallic component 61 and an adjusting screw 62. One end of the bimetallic component 61 extends towards the operating mechanism 2 and engages with the unlocking part 234 of the operating mechanism 2. The other end of the bimetallic component 61 is fixed inside the housing 11. Preferably, the bimetallic component 61 is inclined inside the housing 11, and the angle between the extension direction of the bimetallic component 61 and the first direction is -30° to -10°. The bimetallic component 61 is arranged with a slight inclination. In the third direction, the bimetallic component 61 and the armature 52 are arranged side by side, which can ensure the engagement of the bimetallic component 61 and the armature 52 with the latch, and also avoid occupying too much space between the operating mechanism 2 and the stationary contact 32. One end of the adjusting screw 62 is connected to the other end of the bimetallic component 61, and the other end of the adjusting screw 62 engages with the adjusting hole 114 opened on the housing. By operating the adjusting screw 62, the interval between the bimetallic component 61 and the operating mechanism 2 can be changed, thereby realizing the setting of the current value.

[0065] In this embodiment, the adjustment hole 114 is formed on the side wall of the housing connecting the mounting part and the operating hole 113, and the adjustment hole 114 is parallel to the central axis of the operating hole 113. That is, the central axis of the adjustment hole 114 and the operating hole 113 are parallel to the second direction. After opening the cover 1102, the terminal 7 and the overload protection mechanism 6 can be adjusted from the same side. Of course, the adjustment hole 114 can be correspondingly formed between the operating hole 113 and the terminal 111 of the housing 11, and the adjustment hole 114 of the housing 11 corresponds to the adjustment hole of the housing. By changing the setting position of the adjustment hole 114, the distance between the adjustment hole 114 and the bimetallic component 61 is shortened, so that the adjusting screw 62 or the bimetallic component 61 no longer needs to cross or avoid the terminal 7, so that the overload protection mechanism 6 does not need to be corresponding to the exhaust end of the arc-extinguishing chamber 41, shortening the length of the bimetallic component 61 or the adjusting screw 62, saving internal space and reducing costs. Of course, in this embodiment, the protection mechanism and the stationary contact 32 can also have other coupling methods, such as Figure 7 As shown, in the first direction, the protection mechanism extends towards the operating mechanism 2 in a direction approximately parallel to the second direction. It can also be understood that the protection mechanism is vertically arranged inside the housing 12, and such a structure is similar to the arrangement of existing protection mechanisms.

[0066] Similar to the horizontally arranged protection mechanisms, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side in the third direction. Unlike the horizontally arranged protection mechanisms, in the first direction, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are located on the same side of the moving contact assembly 31 as the second stationary contact 322 and the operating mechanism 2. Furthermore, both the short-circuit protection mechanism 5 and the overload protection mechanism 6 extend along the exhaust end of the adjacent arc-extinguishing chamber 41 towards the operating mechanism 2. This assembly position is conducive to ensuring electrical safety.

[0067] Of course, the operating mechanism 2 can be installed in the housing of only one of the circuit breaker poles 10. That is, only one housing has a mounting part, and the other circuit breaker poles 10 have no communication with the operating mechanism 2. The two circuit breaker poles 10 share an operating mechanism 2 installed in the mounting part. The operating mechanism 2 also adopts the above structure, except that the unlocking part 234 extends along the third direction and protrudes from the mating hole opened on the housing and is located inside the outer shell 11. The other housings do not have mounting parts, but a through hole 125 is opened on the side wall of the housing connected between a pair of operating holes 113. The central axis of the through hole 125 is parallel to the second direction. The through hole 125 is located in the middle of the housing and adjacent to the unlocking part 234 that passes through the housing.

[0068] When the two circuit breaker poles 10 are divided into short-circuit protection pole 101 and overload protection pole 102, it is preferable to set the operating mechanism 2 in the short-circuit protection pole 101 and not set the operating mechanism 2 in the overload protection pole 102. In addition, the housing is provided with an adjustment hole 114 corresponding to the overload protection mechanism 6 and adjacent to the through hole, or the adjustment hole 114 and the through hole are combined into a strip hole with a certain length in the first direction, so that one end of the bimetallic component 61 and the adjustment screw 62 are exposed from both ends of the strip hole. The adjustment hole can be set only on the housing 12 of the overload protection pole 102.

[0069] It should be noted that, in the first direction, when the short-circuit protection mechanism 5 and the overload protection mechanism 6 are located between the exhaust end of the arc-extinguishing chamber 41 on the same side and the terminal 7, the armature 52 or the bimetallic assembly 61 also cooperates with the unlocking part 234 of the operating mechanism 2 through the through hole 125.

[0070] Furthermore, both the armature 52 and the bimetallic component 61 cooperate with the unlocking part 234 of the latch 23. To increase the insulation performance between the armature 52 and the bimetallic component 61, an insulating element can be provided at the tail end of the armature 52 and / or the tail end of the bimetallic component 61, or an insulating element can be provided between the tail end of the armature 52 and / or one end of the bimetallic component 61. Of course, the insulating element and the insulating element can also be integrally provided on the latch 23.

[0071] Combination Figure 1 , 2 Examples of a second type of circuit breaker are provided in 8-11.

[0072] In this embodiment, the circuit breaker includes a housing 11, an operating mechanism 2 and at least two circuit breaker poles 10 are provided inside the housing 11, and each circuit breaker pole 10 includes a housing 12, in which a contact system, an arc extinguishing system and a protection mechanism are provided. The contact system adopts a direct-acting double-break structure. The structure and arrangement of the other structures, such as the housing 11, the operating mechanism 2, the housing 12 and the arc extinguishing system, are as described in the above embodiment.

[0073] Unlike the first embodiment, the contact system in this embodiment includes a moving contact assembly 31 and two stationary contacts 32. In the first direction, the moving contact assembly 31 is disposed between the arc inlets of the two arc-extinguishing chambers 41. The two stationary contacts 32 are spaced apart in the first direction and correspond to the opposite sides of the moving contact assembly 31. In the second direction, the stationary contacts 32 are located between the arc-extinguishing system and the operating mechanism 2. The moving contact assembly 31 is driven by the operating mechanism 2 to move linearly in the second direction.

[0074] Specifically, the moving contact assembly 31 includes a contact support 310 and a moving contact bridge 311. The contact support 310 is connected to the lever drive of the operating mechanism 2. The moving contact bridge 311 is disposed through the contact support 310 along a first direction. Each end of the moving contact bridge 311 is provided with a moving contact portion. Each moving contact portion is spaced apart from a stationary contact 32 in a second direction. The structure of each stationary contact 32 is the same as that of the stationary contact 32 in the above embodiment.

[0075] In this embodiment, the protection mechanism includes a short-circuit protection mechanism 5 and an overload protection mechanism 6. The protection mechanism is disposed between the stationary contact 32 and the operating mechanism 2 along a direction approximately parallel to the first direction. The short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side, that is, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are respectively located on opposite sides of the operating mechanism 2 in the first direction. The short-circuit protection mechanism 5 is coupled to one of the stationary contacts 32, and the overload protection mechanism 6 is coupled to the other stationary contact 32.

[0076] Furthermore, when each circuit breaker pole 10 is divided into a short-circuit protection pole 101 and an overload protection pole 102, in the first direction, the short-circuit protection mechanism 5 in the short-circuit protection pole 101 and the overload protection mechanism 6 in the overload protection pole 102 can be located on opposite sides of the operating mechanism 2. In this embodiment, the specific structure of the short-circuit protection mechanism 5 and the overload protection mechanism 6 can refer to the above embodiment.

[0077] In addition, when the contact system is a rotating double-break structure, the side-by-side arrangement of the short-circuit protection mechanism 5 and the overload protection mechanism 6 is difficult to apply due to the position of the two stationary contacts 32.

[0078] An embodiment of a third type of circuit breaker is provided (not shown).

[0079] In this embodiment, the circuit breaker includes a housing 11, an operating mechanism 2 and at least two circuit breaker poles 10 are provided inside the housing 11, and each circuit breaker pole 10 includes a housing 12, in which a contact system, an arc extinguishing system and a protection mechanism are provided. The contact system adopts a single-break structure, and correspondingly, the arc extinguishing system only needs to be provided with one arc extinguishing chamber 41. The structure and arrangement of the housing 11, the operating mechanism 2, the housing 12 and the protection mechanism are the same as in the first embodiment.

[0080] In this embodiment, the moving contact assembly and the arc extinguishing system can adopt existing technologies. Typically, the contact system includes a moving contact assembly 31 and a stationary contact 32. The moving contact assembly 31 includes a contact support and a moving contact body. The contact support is coaxially rotatably assembled with a lever, and the moving contact body is connected to the contact support. Further, the moving contact body can be formed by two or more moving contact plates coaxially rotatably connected. The stationary contact 32 and the arc extinguishing chamber 41 are arranged side by side in the first direction. One end of the stationary contact plate of the stationary contact 32 is provided with a stationary contact point. The stationary contact point and one end of the moving contact body are spaced apart and opposite each other in the first direction. The other end of the stationary contact plate extends away from the moving contact body along the first direction on one side outside the arc extinguishing chamber 41. The protection mechanism is coupled to the middle of the stationary contact plate. At this time, in the second direction, the protection mechanism, the middle of the stationary contact plate, and the arc extinguishing chamber 41 are arranged sequentially, and the protection mechanism extends towards the operating mechanism 2 in a direction close to the first direction.

[0081] In this embodiment, the short-circuit protection mechanism 5 and the overload protection mechanism 6 in the same circuit breaker pole 10 are arranged side by side in the third direction. Furthermore, the circuit breaker pole 10 can also be divided into a short-circuit protection pole 101 and an overload protection pole 102.

[0082] 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.

[0083] 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 at least two parallel circuit breaker poles (10) are disposed within the housing (11), each circuit breaker pole (10) comprising a housing, wherein a contact system and a protection mechanism are disposed within the housing, the contact system comprising a cooperating moving contact assembly (31) and a stationary contact (32), Its features are: An operating mechanism (2) is provided in the housing of at least one of the circuit breaker poles (10). The protection mechanism is arranged laterally between the corresponding operating mechanism (2) and the stationary contact (32) and extends toward the operating mechanism (2). The protection mechanism includes a short-circuit protection mechanism (5) and an overload protection mechanism (6). The short-circuit protection mechanism (5) and the overload protection mechanism (6) are arranged side by side along the first direction and distributed on opposite sides of the operating mechanism (2), or the short-circuit protection mechanism (5) and the overload protection mechanism (6) are arranged side by side along the third direction on the same side of the operating mechanism (2), with the first direction perpendicular to the third direction.

2. The circuit breaker according to claim 1, characterized in that: Each circuit breaker pole (10) is equipped with an operating mechanism (2) in its housing, which is triggered by a protection mechanism located in the same housing to trip the operating mechanism (2); or one of the circuit breaker poles (10) is equipped with an operating mechanism (2) in its housing, and the protection mechanisms of all circuit breaker poles (10) cooperate with the same operating mechanism (2) to trigger the tripping of the operating mechanism (2).

3. The circuit breaker according to claim 1, characterized in that: One of the circuit breaker poles (10) serves as a short-circuit protection pole (101), and the protection mechanism of the short-circuit protection pole (101) includes only a short-circuit protection mechanism (5). The other circuit breaker pole (10) serves as an overload protection pole (102), and the protection mechanism of the overload protection pole (102) includes only an overload protection mechanism (6).

4. The circuit breaker according to claim 1, characterized in that: Each circuit breaker pole (10) also includes an arc extinguishing system, which includes at least one arc extinguishing chamber (41), one end of which is provided with an arc inlet and the other end of which is away from the arc inlet is an exhaust end. The stationary contact (32) is at least partially stacked with the arc extinguishing chamber (41) in a second direction and extends along the outer wall of the arc extinguishing chamber (41) connecting the arc inlet and the exhaust end in the first direction.

5. The circuit breaker according to claim 4, characterized in that: The arc extinguishing system includes two arc extinguishing chambers (41), with the arc inlets of the two arc extinguishing chambers (41) spaced apart and facing each other in a first direction. The contact system is disposed between the two arc extinguishing chambers (41). In the first direction, the operating mechanism (2) and one arc extinguishing chamber (41) are located on the same side of the contact system, and the operating mechanism (2) and the arc extinguishing chamber (41) on the same side are disposed in a second direction, which is perpendicular to the first direction and the third direction, respectively.

6. The circuit breaker according to claim 5, characterized in that: The contact system includes a moving contact assembly (31) and two stationary contacts (32). The moving contact assembly (31) is driven to connect with the operating mechanism (2). In a first direction, one stationary contact (32) is located on the same side as the operating mechanism (2). In a second direction, the operating mechanism (2), an arc-extinguishing chamber (41) on the same side, and one stationary contact (32) are arranged in sequence. Another stationary contact (32) is located between the operating mechanism (2) and another arc-extinguishing chamber (41), so that the two stationary contacts (32) are arranged in a rotationally symmetrical structure on opposite sides of the moving contact assembly (31).

7. The circuit breaker according to any one of claims 1-6, characterized in that: The operating mechanism (2) includes a lever, a jump buckle and a lock. The lever is rotated and assembled. The jump buckle and the lock are respectively stacked and rotated on the lever. The lock and the jump buckle are fastened together. The lock is provided with an unlocking part (234). The unlocking part (234) is triggered by the short circuit protection mechanism (5) and the overload protection mechanism (6) respectively, so that the lock and the jump buckle are released from fastening.

8. The circuit breaker according to claim 7, characterized in that: The operating mechanism (2) is disposed in the housing of one circuit breaker pole (10), and the unlocking part (234) is disposed through the housing of all circuit breaker poles (10). Alternatively, the unlocking part (234) passes through the housing and cooperates with the short-circuit protection mechanism (5) and / or overload protection mechanism (6) of the other circuit breaker poles (10) in the outer shell (11).

9. The circuit breaker according to claim 7, characterized in that: The operating mechanism (2) is located inside the housing of each circuit breaker pole (10), and the unlocking part (234) is located inside the housing of each circuit breaker pole (10). Two adjacent operating mechanisms (2) are linked together.

10. The circuit breaker according to claim 8, characterized in that: The housing has a through hole (125) in the middle, through hole (125) for the armature (52) of the short circuit protection mechanism (5) or the bimetallic component (61) of the overload protection mechanism (6) inside the housing to pass through. At least one of the housing protrudes outward to form a mounting part for assembling the operating mechanism (2). At least part of the unlocking part (234) of the operating mechanism (2) protrudes out of the mounting part and is adjacent to the through hole (125), so that the unlocking part (234) cooperates with the armature (52) and / or bimetallic component (61) of the other circuit breaker poles (10).

11. The circuit breaker according to claim 10, characterized in that: The two ends of the outer casing (11) serve as wiring terminals (111), and the outer casing (11) connected between the two wiring terminals (111) forms an operating end (112) along the outer side of the mounting portion. The outer casing (11) connected between the wiring terminals (111) and the operating end (112) is provided with an operating hole (113). The outer casing (11) and / or housing is provided with an adjustment hole (114), and the adjustment hole (114) is located on the side wall of the outer casing (11) and / or housing between the operation hole (113) and the operation end (112), so that the adjustment screw (62) of the overload protection mechanism (6) corresponds to the adjustment hole (114).

12. The circuit breaker according to claim 11, characterized in that: It also includes a handle mechanism (8) arranged side by side with the operating mechanism (2). The handle mechanism (8) is linked to the operating mechanism (2) and is jointly arranged in the mounting part. The mounting part and the operating end (112) are provided with corresponding handle holes (116). The handle part of the handle mechanism (8) extends out of the outer shell (11) from the handle hole (116).

13. The circuit breaker according to claim 7, characterized in that: The middle of each housing protrudes outward to form a mounting part, and each mounting part is provided with an operating mechanism (2). The short circuit protection mechanism (5) or overload protection mechanism (6) in the same housing cooperates with the operating mechanism (2), and the operating mechanisms (2) of two adjacent circuit breaker poles (10) are linked together.

14. The circuit breaker according to claim 1, characterized in that: The short-circuit protection mechanism (5) includes a magnetic yoke (51), an armature (52) and a conductive plate (70). The armature (52) and the magnetic yoke (51) are spaced apart. The conductive plate (70) passes through the conductor cavity formed between the armature (52) and the magnetic yoke (51). The head end of the armature (52) is rotatably assembled. The tail end of the armature (52) is used to trigger the operating mechanism (2) to trip.

15. The circuit breaker according to claim 1, characterized in that: The overload protection mechanism (6) includes a double metal component (61) and an adjusting screw (62). One end of the double metal component (61) is engaged with the operating mechanism (2), and the other end of the double metal component (61) is connected to one end of the adjusting screw (62). The other end of the adjusting screw (62) corresponds to the adjusting hole (114) opened on the housing.

Images