Circuit breaker

Abstract

The circuit breaker comprises a shell, an operating mechanism and at least one conductive unit are arranged in the shell, the conductive unit comprises a contact system, an arc extinguish chamber and an accessory module, the contact system comprises a moving contact assembly and a static contact assembly, the arc extinguish chamber comprises a first arc extinguish cavity and a second arc extinguish cavity, an included angle is formed between the first arc extinguish cavity and the second arc extinguish cavity, and one ends of the first arc extinguish cavity and the second arc extinguish cavity are communicated. The accessory module, the operating mechanism, the moving contact assembly and the first arc extinguishing cavity are sequentially arranged side by side in the first direction, and the static contact assembly extends to the joint of the first arc extinguishing cavity and the second arc extinguishing cavity in the first direction and extends to the joint of the first arc extinguishing cavity and the second arc extinguishing cavity in the second direction. The static contact assembly is located on the side, facing the operating mechanism, the moving contact assembly and the accessory module, of the second arc extinguishing cavity, and the first direction is perpendicular to the second direction. According to the utility model, the layout is reasonable, the internal space is fully utilized, the arc extinguishing chamber has a larger space, and more arc extinguishing grid sheets can be conveniently arranged, so that the breaking performance of the circuit breaker is improved.

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 molded case circuit breaker is a low-voltage circuit protection device with overload, short circuit and undervoltage protection functions. It is an important electrical device for protecting circuit safety. Its arc-extinguishing chamber is a key component for the circuit breaker to complete the relevant breaking parameters. The arc-extinguishing chamber is usually composed of arc-extinguishing grids, side plates and gas generating components, which are used to limit the movement area of ​​the electric arc and extinguish the electric arc.

[0003] In existing products, to improve the breaking performance of circuit breakers, the number of arc-extinguishing grids is usually increased to increase the arc voltage. However, due to the limited internal space of the circuit breaker and the dispersed and complex layout of the internal modules, it is impossible to meet the development needs of miniaturization and modularization of circuit breakers, and it is also impossible to reserve more assembly space for the arc-extinguishing chamber. Summary of the Invention

[0004] The purpose of this utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a circuit breaker, including a housing, within which an operating mechanism and at least one conductive unit are disposed. The conductive unit includes a contact system, an arc-extinguishing chamber, and an accessory module. The contact system includes a moving contact assembly and a stationary contact assembly. The arc-extinguishing chamber includes a first arc-extinguishing cavity and a second arc-extinguishing cavity that are at an angle to each other and connected at one end. The accessory module, the operating mechanism, the moving contact assembly, and the first arc-extinguishing cavity are arranged side by side in a first direction. The stationary contact assembly extends along the first direction to the junction of the first and second arc-extinguishing cavities. In a second direction, the stationary contact assembly is located on the side of the second arc-extinguishing cavity facing the operating mechanism, the moving contact assembly, and the accessory module. The first and second directions are perpendicular to each other.

[0007] Preferably, each conductive unit further includes a pair of terminals, each pair of terminals being spaced apart at opposite ends of the housing along a first direction, and the contact system being electrically connected between the pair of terminals.

[0008] Preferably, the conductive unit further includes a housing, the space inside the housing is divided into four mounting cavities, three of which are arranged side by side in the first direction, the accessory module, the contact system and the first arc extinguishing cavity are respectively arranged in the three side by side mounting cavities, and the other mounting cavity is used to set the second arc extinguishing cavity. The three mounting cavities are arranged side by side in the second direction, and the mounting cavity used to assemble the second arc extinguishing cavity has the longest length in the first direction.

[0009] Preferably, the housing has a clearance groove in the middle, and the operating mechanism passes through the clearance groove to drive the connection with the moving contact assembly.

[0010] Preferably, the housing has a first exhaust port and a second exhaust port spaced apart in a first direction on opposite sides, with the lowest point of the first exhaust port higher than the highest point of the second exhaust port, and the inner diameter of the first exhaust port smaller than the inner diameter of the second exhaust port.

[0011] The first exhaust port is connected to the side of the first arc-extinguishing chamber opposite to the contact system, and the second exhaust port is connected to the end of the second arc-extinguishing chamber away from the first arc-extinguishing chamber. Both the first exhaust port and the second exhaust port are equipped with at least one anti-freezing element.

[0012] Preferably, the housing includes a pair of mutually overlapping partitions, the contact system and the arc-extinguishing chamber are disposed in the space between the pair of partitions, and a protruding post is provided in the housing between the second exhaust port and one end of the second arc-extinguishing chamber.

[0013] Preferably, the accessory module is a trip unit, which includes a thermomagnetic trip assembly and an adjustable trip assembly. The thermomagnetic trip assembly is fixedly connected to the connecting plate on the moving contact, and the adjustable trip assembly is fixed to the thermomagnetic trip assembly and cooperates with the operating mechanism.

[0014] Preferably, the stationary contact assembly includes a stationary contact plate and a stationary arc-drawing angle. One end of the stationary contact plate is connected to the stationary arc-drawing angle. The stationary contact plate is disposed at the junction of the two arc-extinguishing cavities, and the stationary contact plate and the moving contact assembly together correspond to the first arc-extinguishing cavity. The other end of the stationary arc-drawing angle extends to the second arc-extinguishing cavity along a first direction.

[0015] Preferably, one end of the stationary contact plate is provided with a contact portion, which is connected to the stationary arc-drawing angle and cooperates with the moving contact assembly. The other end of the stationary contact plate is provided with a wiring portion, and the stationary contact plate connected between the wiring portion and the contact portion forms a mating area. The stationary arc-drawing angle passes through the mating area and connects with the contact portion, and the arc is drawn by the mating area in cooperation with the first arc-extinguishing cavity.

[0016] Preferably, the stationary contact plate connected between the contact portion and the wiring portion is disposed along the outer side of the first arc-extinguishing cavity, and a U-shaped groove forming a mating area is formed by the contact portion, the wiring portion and the middle of the stationary contact plate.

[0017] Preferably, an arc-blocking plate is provided between the stationary contact plate and the outer side of the first arc-extinguishing cavity.

[0018] Preferably, the stationary contact plate connecting the contact portion and the wiring portion is disposed through the first arc-extinguishing cavity, and the stationary contact plate located in the first arc-extinguishing cavity has a through hole as a mating area.

[0019] Preferably, the first arc-extinguishing cavity is provided with a first arc inlet, the opening and closing trajectory of the moving contact assembly corresponds to the first arc inlet, the mating area forms a communication port between the first arc-extinguishing cavity and the second arc-extinguishing cavity, and the inner diameter of the communication port is smaller than the inner diameter of the first arc inlet.

[0020] Preferably, the arc-extinguishing chamber is further provided with an arc-initiating plate. In the first direction, the arc-initiating plate and the stationary arc-initiating angle are spaced apart and opposite each other in the mating area, so that an airflow channel is formed between the arc-initiating plate and the stationary arc-initiating part of the stationary arc-initiating angle. One end of the arc-initiating plate is located in the first arc-extinguishing cavity and is connected to the stationary contact plate near the wiring part. The other end of the arc-initiating plate extends through the mating area into the second arc-extinguishing cavity.

[0021] Preferably, the first arc-extinguishing cavity is provided with at least one grid plate group, the second arc-extinguishing cavity is provided with at least one grid plate group, and an arc-inducing plate and / or connecting grid plate group are provided between the grid plate groups of the first arc-extinguishing cavity and the second arc-extinguishing cavity.

[0022] Preferably, the arc-extinguishing chamber includes a pair of spaced-apart side plates, the gap between the pair of side plates forms an arc-extinguishing cavity, and at least a pair of spaced-apart gas-generating elements are provided in the gap between the pair of side plates, and the arc-extinguishing cavity is divided into a first arc-extinguishing cavity and a second arc-extinguishing cavity.

[0023] Alternatively, the arc-extinguishing chamber includes two pairs of spaced-apart side plates, with the gap between each pair of side plates forming a first arc-extinguishing cavity or a second arc-extinguishing cavity, and a pair of spaced-apart gas-generating elements provided between each pair of side plates.

[0024] The first arc-extinguishing cavity is provided with a first grid plate group, and the second arc-extinguishing cavity is provided with a second grid plate group. The first grid plate group is connected to the side plate and the gas generating component of the first arc-extinguishing cavity, and the second grid plate group is connected to the side plate and the gas generating component of the second arc-extinguishing cavity.

[0025] Preferably, the first arc-extinguishing cavity and the second arc-extinguishing cavity are perpendicular to each other.

[0026] The circuit breaker of this utility model has two arc-extinguishing chambers in the arc-extinguishing chamber. The first arc-extinguishing chamber is arranged side by side with the accessory module, the operating mechanism and the moving contact assembly. The stationary contact assembly extends along the first direction to the junction of the first arc-extinguishing chamber and the second arc-extinguishing chamber. In the second direction, the stationary contact assembly is located on the side of the second arc-extinguishing chamber facing the operating mechanism, the moving contact assembly and the accessory module. Its layout is reasonable and makes full use of the internal space. At the same time, it also gives the arc-extinguishing chamber more space, which is convenient for arranging more arc-extinguishing grids, thereby improving the breaking performance of the circuit breaker.

[0027] In addition, the conductive unit has a separate housing, which facilitates modularization and easy assembly.

[0028] In particular, the space inside the housing is divided into multiple mounting cavities to facilitate the assembly of accessory modules, contact systems and arc-extinguishing chambers. The second arc-extinguishing chamber is located in a larger mounting cavity, which facilitates the assembly of more arc-extinguishing grid plates, thereby increasing the volume of the arc-extinguishing chamber.

[0029] In addition, a static arc-starting angle is provided on the side of the second arc-extinguishing chamber facing the contact system to improve the arc-starting efficiency. An exhaust groove is provided on the side of the second arc-extinguishing chamber facing away from the contact system. In particular, the exhaust groove includes a first exhaust groove and a second exhaust groove. By gradually increasing the opening of the first exhaust groove, a pressure gradient is formed, which is conducive to the discharge of airflow.

[0030] In addition, the two arc-extinguishing chambers of the arc-extinguishing chamber can be an integral structure or a separate structure, which has a wide range of applications.

[0031] In addition, the stationary contact plate is arranged along the outer side of the first arc-extinguishing cavity, which not only saves internal space, but also forms a magnetic field in the first arc-extinguishing cavity, which is beneficial for arc ignition.

[0032] In addition, the stationary contact plate can pass through the first arc-extinguishing chamber, saving internal space. In particular, the arc-initiating plate and the stationary arc-initiating angle form an airflow channel in the mating area. The narrower inlet and wider outlet of the airflow channel are conducive to the formation of air pressure difference, which is beneficial to arc initiation. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the circuit breaker of this utility model;

[0034] Figure 2 This is a schematic diagram of the circuit breaker structure in the first embodiment of this utility model. Figure 1 ;

[0035] Figure 3 This is a schematic diagram of the circuit breaker structure in the first embodiment of this utility model. Figure 2 ;

[0036] Figure 4 This is a schematic diagram of the internal structure of the circuit breaker in the first embodiment of this utility model;

[0037] Figure 5 This is a schematic diagram of the structure of two conductive units in the first embodiment of this utility model;

[0038] Figure 6 This is an exploded view of the conductive unit in the first embodiment of this utility model;

[0039] Figure 7 This is a schematic diagram of the structure of a partition between the conductive unit and the housing in the first embodiment of this utility model;

[0040] Figure 8 This is a schematic diagram of the internal structure of the conductive unit after the arc-extinguishing chamber has been removed in the first embodiment of this utility model;

[0041] Figure 9 This is a schematic diagram of the contact system and the housing in the first embodiment of this utility model;

[0042] Figure 10 This is a schematic diagram of the structure of the two contact systems in the first embodiment of this utility model;

[0043] Figure 11 This is a schematic diagram of the contact system in the first embodiment of the present invention during opening;

[0044] Figure 12 This is a schematic diagram of the static contact assembly in the first embodiment of this utility model;

[0045] Figure 13 This is a schematic diagram of the static contact plate in the first embodiment of this utility model;

[0046] Figure 14 This is a schematic diagram of the static arc angle in the first embodiment of this utility model. Figure 1 ;

[0047] Figure 15 yes Figure 14 The main view;

[0048] Figure 16 This is a schematic diagram of the static arc angle in the first embodiment of this utility model. Figure 2 ;

[0049] Figure 17 yes Figure 16 The main view;

[0050] Figure 18 This is a schematic diagram of the structure of the dynamic arc angle in the first embodiment of this utility model. Figure 1 ;

[0051] Figure 19 This is a schematic diagram of the dynamic arc-starting structure in the first embodiment of this utility model. Figure 2 ;

[0052] Figure 20 This is a schematic diagram of the contact system and arc-extinguishing chamber in the first embodiment of this utility model. Figure 1 ;

[0053] Figure 21 This is a schematic diagram of the contact system and arc-extinguishing chamber in the first embodiment of this utility model. Figure 2 ;

[0054] Figure 22 This is a schematic diagram of the contact system and arc-extinguishing chamber in the first embodiment of this utility model. Figure 3 ;

[0055] Figure 23This is a schematic diagram of the contact system and arc-extinguishing chamber in the first embodiment of this utility model. Figure 4 ;

[0056] Figure 24 This is an exploded view of the arc-extinguishing chamber in the first embodiment of this utility model. Figure 1 ;

[0057] Figure 25 This is an exploded view of the arc-extinguishing chamber in the first embodiment of this utility model. Figure 2 ;

[0058] Figure 26 This is an exploded view of the arc-extinguishing chamber in the first embodiment of this utility model. Figure 3 ;

[0059] Figure 27 This is a schematic diagram of the gas-generating component in the first embodiment of this utility model. Figure 1 ;

[0060] Figure 28 This is a schematic diagram of the gas-generating component in the first embodiment of this utility model. Figure 2 ;

[0061] Figure 29 This is a schematic diagram of the gas-generating component in the first embodiment of this utility model. Figure 3 ;

[0062] Figure 30 This is a schematic diagram of the gas-generating component in the first embodiment of this utility model. Figure 4 ;

[0063] Figure 31 This is a schematic diagram of the gas-generating component in the first embodiment of this utility model. Figure 5 ;

[0064] Figure 32 This is a cross-section of the arc-extinguishing cavity in the first embodiment of this utility model. Figure 1 ;

[0065] Figure 33 This is a cross-section of the arc-extinguishing cavity in the first embodiment of this utility model. Figure 2 ;

[0066] Figure 34 This is a schematic diagram of the arc-extinguishing grid sheet in the first embodiment of this utility model. Figure 1 ;

[0067] Figure 35 This is a schematic diagram of the arc-extinguishing grid sheet in the first embodiment of this utility model. Figure 2 ;

[0068] Figure 36 This is a schematic diagram of the arc-extinguishing grid sheet in the first embodiment of this utility model. Figure 3 ;

[0069] Figure 37 This is a schematic diagram of the arc-inducing plate in the first embodiment of this utility model. Figure 1 ;

[0070] Figure 38 This is a schematic diagram of the arc-inducing plate in the first embodiment of this utility model. Figure 2 ;

[0071] Figure 39 This is a schematic diagram of the conductive unit in the second embodiment of the present invention;

[0072] Figure 40 yes Figure 39 The main view;

[0073] Figure 41 yes Figure 39 Cross-sectional view;

[0074] Figure 42 This is a schematic diagram of the electric arc when the moving contact assembly and the stationary contact assembly have just separated, according to the second embodiment of this utility model;

[0075] Figure 43 This is a schematic diagram of the electric arc when the moving contact assembly is half open, according to the second embodiment of this utility model. Figure 1 ;

[0076] Figure 44 This is a schematic diagram of the electric arc when the moving contact assembly is half open, according to the second embodiment of this utility model. Figure 2 ;

[0077] Figure 45 This is a schematic diagram of the electric arc when the moving contact assembly is just opened to its maximum extent according to the second embodiment of this utility model;

[0078] Figure 46 This is a schematic diagram of the electric arc when the moving contact assembly is opened to its maximum extent according to the second embodiment of this utility model;

[0079] Figure 47 This is a schematic diagram of the airflow in the airflow channel in the second embodiment of this utility model;

[0080] Figure 48 This is a front view of the contact system in the second embodiment of this utility model;

[0081] Figure 49 This is an exploded view of the arc-extinguishing system in the second embodiment of this utility model;

[0082] Figure 50 This is a cross-sectional view of the arc-extinguishing chamber in the second embodiment of this utility model;

[0083] Figure 51 This is a schematic diagram of the gas-generating component in the second embodiment of this utility model;

[0084] Figure 52 This is a schematic diagram of the gas-generating component in the second embodiment of this utility model. Figure 1 ;

[0085] Figure 53 This is a schematic diagram of the gas-generating component in the second embodiment of this utility model. Figure 2 ;

[0086] Figure 54 This is a schematic diagram of the gas-generating component in the second embodiment of this utility model. Figure 3 ;

[0087] Figure 55 This is a cross-sectional view of the gas-generating component in the second embodiment of this utility model;

[0088] Figure 56 This is a schematic diagram of the static contact assembly in the second embodiment of this utility model;

[0089] Figure 57 This is a front view of the stationary contact assembly in the second embodiment of this utility model;

[0090] Figure 58 This is a cross-sectional view of the stationary contact assembly in the second embodiment of this utility model;

[0091] Figure 59 This is a schematic diagram of the static contact plate in the second embodiment of this utility model;

[0092] Figure 60 This is a schematic diagram of the static arc angle in the second embodiment of this utility model;

[0093] Figure 61 This is a schematic diagram of the arc-guiding plate in the second embodiment of this utility model;

[0094] Figure 62 This is a schematic diagram of the structure of the second arc-blocking cover in the second embodiment of this utility model;

[0095] Reference numerals:

[0096] 11-Face cover, 12-Base, 2-Operating mechanism, 3-Conductive unit, 31-Housing, 310-Partition plate, 3111-First exhaust port, 3112-Second exhaust port, 3113-Exhaust groove, 3113a-First exhaust groove, 3113b-Second exhaust groove, 312-Protrusion, A-First mounting cavity, B-Second mounting cavity, C-Third mounting cavity, D-Fourth mounting cavity, 32-Contact system, 321-Shaft, 322-Moving contact, 323-Stationary contact assembly, 3230-Stationary contact plate, 3231-Contact part, 32311 - Connecting section, 3232 Wiring part, 3233 Stationary contact, 3234 Inclined section, 3235 Horizontal section, 3236 First transition section, 3237 Second transition section, 3238 Mating area, 3239 Airflow channel, 32391 Inlet, 32392 Outlet, 3241 First arc-blocking cover, 3242 Second arc-blocking cover, 32420 Body, 32421 Extension, 32422 Baffle, 32423 Arc-starting support leg, 32424 Support part, 32425 Groove, 33 Arc-extinguishing chamber, 330 1-First arc inlet, 3302-Arc track, 3303-Side plate, 3304-Gas generating component, 33041-Ribing, 33042-Mounting groove, 33043-Positioning rib, 33044-Wrapping slot, 3305-Slit, 3306-Longitudinal seam, 331-First arc extinguishing cavity, 332-Second arc extinguishing cavity, 333-Dynamic arc ignition angle, 3331-Dynamic arc ignition part, 3332-Dynamic sharp corner, 334-Static arc ignition angle, 3341-Static arc ignition part, 33410-Arc ignition protrusion, 33411-First segment, 33412-Second segment 33413 - Third section, 3342 - Static sharp corner, 3343 - Opening slot, 3344 - Protrusion, 335 - Arc-inducing plate, 3361 - First grid plate group, 3362 - Second grid plate group, 3363 - Connecting grid plate group, 3360 - Arc-extinguishing grid plate, 33601 - Arc-extinguishing notch, 33602 - Support leg, 33603 - Notch slot, 337 - Arc-isolating plate, 338 - De-idling component, 339 - Magnetic yoke, 3391 - Magnetizing component, 34 - Connecting plate, 35 - Accessory module, 351 - Thermomagnetic tripping component, 352 - Adjustable tripping component. Detailed Implementation

[0097] 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.

[0098] A circuit breaker includes a housing, within which an operating mechanism 2 and at least one conductive unit 3 are disposed. The housing has an operating hole, and the operating mechanism 2 is connected to an operating element extending from the operating hole to the outside of the housing for manually driving the operating mechanism 2. Each conductive unit 3 includes a pair of terminals, a contact system 32, and an arc-extinguishing chamber 33. The pair of terminals are spaced apart at both ends of the housing. The contact system 32 is electrically connected between the pair of terminals and is positioned at the first arc inlet 3301 of the arc-extinguishing chamber 33. The contact system 32 includes a cooperating moving contact assembly and a stationary contact assembly 323. The components typically include a rotating shaft 321 and a moving contact 322. The rotating shaft 321 is rotatably disposed in the middle of the housing 31 and driven by the operating mechanism 2. The moving contact 322 is connected to the rotating shaft 321. The driving operating mechanism 2 drives the rotating shaft 321 to rotate within the housing 31, causing the moving contact 322 to be driven to contact or separate from the stationary contact assembly 323. The arc generated by the moving contact 322 breaking with the stationary contact assembly 323 is extinguished by the arc-extinguishing chamber 33. Typically, each conductive unit 3 may also include a housing 31. The contact system 32 and the arc-extinguishing chamber 33 can be assembled within the housing 31, thereby facilitating the formation of a modular structure and making assembly convenient.

[0099] Furthermore, each conductive unit 3 may also be provided with an accessory module 35. The accessory module 35 can be connected to the control module located inside the housing. The controller in the control module outputs a control signal to drive the accessory module 35. Of course, when the accessory module 35 is a thermomagnetic trip unit or the like, the thermomagnetic trip unit current is connected to the main circuit of the conductive unit 3. When an abnormal current flows through the main circuit, the thermomagnetic trip unit triggers the operating mechanism 2 to trip. The working principle of the accessory module 35 can adopt existing technology.

[0100] For ease of description, the direction of the connection between a pair of terminals in each conductive unit 3 is taken as the first direction, that is, in Figure 1 , 4 In the middle, the left and right directions are the first direction, and the two directions perpendicular to the first direction are the second direction and the third direction. The second direction is... Figure 1 , 4 The vertical direction in the middle, and the third direction is... Figure 1 , 4 The direction perpendicular to the paper.

[0101] like Figure 1-4As shown, the improvement of this application is that the arc-extinguishing chamber 33 includes a first arc-extinguishing cavity 331 and a second arc-extinguishing cavity 332 that are at an angle to each other and connected at one end. The accessory module 35, the operating mechanism 2, the moving contact assembly, and the first arc-extinguishing cavity 331 are arranged side by side in a first direction. The stationary contact assembly 323 extends along the first direction to the junction of the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332. In the second direction, the stationary contact assembly 323 is located on the side of the second arc-extinguishing cavity 332 facing the operating mechanism 2, the moving contact assembly, and the accessory module 35. The first direction and the second direction are perpendicular to each other. This structure is reasonable and makes full use of the internal space. It also gives the arc-extinguishing chamber 33 more space to facilitate the arrangement of more arc-extinguishing grid plates, thereby improving the breaking performance of the circuit breaker.

[0102] Preferably, each conductive unit 3 also includes a housing 31. The separate housing 31 facilitates modularization and assembly. Specifically, the space within the housing 31 is divided into four mounting cavities. Three of these cavities are arranged side-by-side in the first direction. The accessory module 35, the contact system 32, and the first arc-extinguishing chamber 331 are respectively located within these three side-by-side mounting cavities. Preferably, a clearance groove is provided in the middle of the housing 31, corresponding to the mounting cavity containing the moving contact assembly. This allows the operating mechanism 2 to pass through the clearance groove and connect to the moving contact assembly. The other mounting cavity is used to house the second arc-extinguishing chamber 332, which is arranged side-by-side with the three mounting cavities in the second direction. The mounting cavity for assembling the second arc-extinguishing chamber 332 has the longest length in the first direction, facilitating the assembly of more arc-extinguishing grid plates and thus increasing the volume of the arc-extinguishing chamber.

[0103] Combination Figure 1-38 A first embodiment of a circuit breaker is provided.

[0104] like Figure 1-8 As shown, the circuit breaker includes a housing, within which an operating mechanism 2 and two conductive units 3 are disposed. The operating mechanism 2 can employ existing technology. In a second direction, the operating element of the operating mechanism 2 is disposed above the two conductive units 3. The two conductive units 3 are arranged side by side in a third direction. In this embodiment, the housing includes a base 12 and a cover 11 that covers the base 12 along the second direction. An operating hole is provided in the middle of the cover 11. An operating element connected to the operating mechanism 2 extends out from the operating hole for manually driving the operating mechanism 2. The two conductive units 3 are arranged side by side within the base 12. Furthermore, a partition is provided inside the housing to separate two adjacent conductive units 3, preventing the risk of breakdown between two adjacent conductive units 3.

[0105] Each conductive unit 3 includes a pair of terminals (not shown), which are spaced apart along a first direction, such that each terminal is correspondingly located at one end of the housing. A contact system 32, an arc-extinguishing system, and an accessory module 35 are disposed between the pair of terminals. The contact system 32 is electrically connected between the pair of terminals and is used to control the on / off state of the main circuit in each conductive unit 3. The contact system 32 includes a cooperating moving contact assembly and a stationary contact assembly 323. The arc-extinguishing chamber 33 includes two arc-extinguishing cavities, each with an opening on its side. One end of the two arc-extinguishing cavities is connected and forms an angle with each other, connecting the interiors of the two arc-extinguishing cavities and their openings. In this embodiment, the two arc-extinguishing cavities are perpendicular to each other. The arc-extinguishing cavity arranged along the second direction is designated as the first arc-extinguishing cavity 331. The opening of the first arc-extinguishing cavity 331 serves as the first arc inlet 3301, and one side of the first arc inlet 3301 is located at the junction of the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332. The first arc inlet 3301 is located on the side of the first arc-extinguishing cavity 331, which facilitates a larger opening distance between the moving contact assembly and the stationary contact assembly 323. The opening of the second arc-extinguishing cavity 332 serves as the second arc inlet and communicates with the first arc inlet 3301. The grid plate groups in the two arc-extinguishing cavities are connected. The first grid plate group 33 is provided in the first arc-extinguishing cavity 331. 61. A section of the first grid plate group 3361, away from the second arc-extinguishing cavity 332, extends along the first direction to one side of the first arc inlet 3301. The first grid plate group 3361 includes a plurality of spaced-apart arc-extinguishing grid plates 3360. Some of the arc-extinguishing grid plates 3360 are spaced-apart along the second direction on the side opposite to the first arc inlet 3301, while the other part of the arc-extinguishing grid plates 3360 are spaced-apart along the first direction on the side away from the second arc-extinguishing cavity 332 and away from the first arc inlet 3301. Alternatively, the first grid plate group 3361 can be understood as including a main grid plate group and a secondary grid plate group, wherein the main grid plate group is spaced-apart from the first arc inlet 3301, and one end of the main grid plate group... The tail end of the first grid group 3361 is connected at an angle to the head end of the second grid group 3362. The other end of the main grid group is connected at an angle to one end of the sub-grid group. The sub-grid group and the second grid group 3362 are connected at an angle to both ends of the main grid group, and the sub-grid group and the second grid group 3362 are parallel to each other. In this embodiment, the main grid group is perpendicular to the sub-grid group and the second grid group 3362. The arc-extinguishing cavity arranged along the first direction is the second arc-extinguishing cavity 332. The second grid group 3362 is provided in the second arc-extinguishing cavity 332. The second grid group 3362 includes a plurality of arc-extinguishing grids 3360 arranged at intervals along the first direction.

[0106] In this embodiment, both the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 have open structures on all four sides. This can also be understood as the four planes in the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 being completely open. The opening along the length direction in the first arc-extinguishing cavity 331 is the first arc inlet 3301 of the first arc-extinguishing cavity 331. The first arc inlet 3301 is used to cooperate with the contact system, and the first arc inlet 3301 corresponds to the movement trajectory of the moving contact 322. The opening along the length direction in the second arc-extinguishing cavity 332 is the second arc inlet, which is covered by the static arc-drawing angle 334.

[0107] In this embodiment, as Figure 4 As shown, the first arc-extinguishing cavity 331, the moving contact assembly, and the operating system are arranged side by side in the first direction. The stationary contact assembly 323 extends along the first direction to the junction of the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 for cooperation with the moving contact assembly. In the second direction, the stationary contact assembly 323 is located on the side of the second arc-extinguishing cavity 332 facing the operating mechanism 2 and the moving contact assembly. That is, the moving contact assembly and the stationary contact assembly 323 correspond to the first arc inlet 3301 and are spaced apart from each other in the second direction. Located on the side of the first arc inlet 3301 near the second arc extinguishing cavity 332; the accessory module 35 and the first arc extinguishing cavity 331 are respectively located on opposite sides of the contact system 32, that is, the accessory module 35, the contact system 32 and the first arc extinguishing cavity 331 are arranged sequentially in the first direction, and the accessory module 35 is located between the operating member of the operating mechanism 2 and the second arc extinguishing cavity 332 in the second direction. The accessory module 35 is a trip unit, which facilitates the connection of the trip unit to the main line of the conductive unit 3, and also facilitates the cooperation between the trip unit and the operating mechanism 2.

[0108] Preferably, Figure 1-3 As shown in Figures 6-9, each conductive unit 3 includes a housing 31, which provides assembly space to facilitate the formation of a modular structure. Furthermore, the accessory module 35, the contact system 32, and the arc-extinguishing chamber 33 are disposed within the housing 31, and the wiring terminals are disposed at both ends of the housing, thereby providing a larger space within the housing 31 to accommodate the arc-extinguishing chamber 33.

[0109] Specifically, such as Figure 6 As shown, the housing 31 includes two partitions 310 that are spaced apart and opposite each other in the third direction, forming a cavity between the two partitions 310. The housing 31 can serve as a partition inside the outer shell to separate two adjacent conductive units 3, thereby reducing the risk of internal breakdown and improving the insulation level between phases. Moreover, the way the two partitions 310 are spliced ​​can ensure the sealing of the internal arc-extinguishing chamber 33.

[0110] like Figure 4 , 6As shown in Figure -8, a clearance groove is provided in the middle of one side of the housing 31. The operating mechanism 2 is driven to the rotating shaft 321 through the clearance groove. The space inside the housing 31 is divided into four mounting cavities. Three of the mounting cavities are arranged side by side in the first direction, so that the accessory module 35, the moving contact assembly, and the first arc-extinguishing cavity 331 are respectively arranged in the three side by side mounting cavities. The other mounting cavity is used to set the second arc-extinguishing cavity 332 and is arranged side by side with the three mounting cavities in the second direction. The mounting cavity used to assemble the second arc-extinguishing cavity 332 has the largest volume in the first direction. The stationary contact assembly 323 is mainly set in the mounting space used to assemble the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332. This structure is conducive to increasing the size of the second arc-extinguishing cavity 332, making it easier to set more arc-extinguishing grid plates 3360 in the second arc-extinguishing cavity 332, thereby increasing the volume of the arc-extinguishing chamber 33. Figure 8 In the first direction, three mounting cavities arranged side by side are the first mounting cavity A, the second mounting cavity B, and the third mounting cavity C. The first mounting cavity A is located in the middle and is used to assemble the contact system 32. A clearance groove is opened on the first mounting cavity A. The remaining mounting cavity is the fourth mounting cavity D. The second mounting cavity B and the fourth mounting cavity D are connected at one end to be used to set the first arc extinguishing cavity 331 and the second arc extinguishing cavity 332 respectively. The third mounting cavity C is used to assemble the accessory module 35.

[0111] In this embodiment, if Figure 10-17 As shown, the contact system 32 includes a moving contact assembly and a stationary contact assembly 323. The moving contact assembly can adopt existing technology. The moving contact assembly typically includes a rotating shaft 321 and a moving contact 322. The rotating shaft 321 is rotatably mounted in the middle of the housing 31, that is, the rotating shaft 321 is rotatably disposed in the first mounting cavity A. The operating mechanism 2 is driven to the rotating shaft 321 through a clearance groove. One end of the moving contact 322 is driven to the rotating shaft 321, and the other end of the moving contact 322 is provided with a moving contact and extends into the first arc inlet 3301 of the arc extinguishing chamber 33. The opening and closing movement trajectory of the moving contact 322 corresponds to the first arc inlet 3301. That is, the opening position and closing position of the moving contact 322 correspond to the opposite sides of the first arc inlet 3301, respectively. Compared with the existing circuit breaker with two arc extinguishing cavities, the swing amplitude of the moving contact 322 in this embodiment is smaller. Compared with the circuit breaker with only one arc extinguishing cavity, the arc extinguishing effect of this embodiment is better.

[0112] like Figure 4 , 10As shown in Figure -17, the stationary contact assembly 323 includes a stationary contact plate 3230. The stationary contact plate 3230 is mainly located in the same mounting cavity as the first arc-extinguishing cavity 331. The stationary contact plate 3230 and the moving contact assembly correspond to the first arc-extinguishing cavity 331. One end of the stationary contact plate 3230 is provided with a contact portion 3231, and the contact portion 3231 is provided with a stationary contact point 3233. The contact portion 3231 is correspondingly disposed on one side of the first arc inlet 3301, and the contact portion 3231 is located on the side of the first arc inlet 3301 closer to the second arc-extinguishing cavity 332, so that the stationary contact point... The moving contact 3233 is spaced apart from the moving contact in the second direction. The middle part of the stationary contact plate 3230 extends along the first direction outside the first arc extinguishing cavity 331. The middle plate surface of the stationary contact plate 3230 is parallel to the plane formed by the first direction and the second direction. The current flowing through the stationary contact plate 3230 can form a magnetic field in the first arc extinguishing cavity 331 to drive the arc movement. The other end of the stationary contact plate 3230 is provided with a wiring part 3232 for connecting to the wiring terminal. The wiring part 3232 and the contact part 3231 are spaced apart from each other in the first direction.

[0113] Preferably, the stationary contact plate 3230 between the contact portion 3231 and the wiring portion 3232 is provided with a mating area 3238, and the stationary arc-drawing portion 3341 passes through the mating area 3238 and connects to the contact portion 3231. The mating area 3238 is the space formed by the contact portion 3231, the wiring portion 3232 and the stationary contact plate 3230 connected between the contact portion 3231 and the wiring portion 3232.

[0114] like Figure 6 , 11 As shown in Figure 17, the stationary contact assembly 323 also includes a stationary arc-leading angle 334. The connection between the stationary arc-leading angle 334 and the stationary contact plate 3230 is located at the connection between the two arc-extinguishing cavities. That is, corresponding to the first arc inlet 3301 side of the connection between the two arc-extinguishing cavities, the other end of the stationary arc-leading angle 334 extends along the first direction to the second arc-extinguishing cavity 332. Preferably, the stationary arc-leading angle 334 extends along the outside of the opening (second arc inlet) of the second arc-extinguishing cavity 332. It can also be understood that the stationary arc-leading angle 334 covers one side of the opening of the second arc-extinguishing cavity 332, thereby introducing the arc into the arc-extinguishing cavity. The stationary arc-leading angle 334 is mainly located in the same mounting cavity as the second arc-extinguishing cavity 332.

[0115] The stationary contact plate 3230 and the stationary arc-drawing angle 334 are respectively arranged facing each other along the first direction, and the connection between the stationary contact plate 3230 and the stationary arc-drawing angle 334 is located at the junction of the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332. Preferably, the stationary arc-drawing angle 334 is arranged along the outer side of the second arc-drawing inlet of the second arc-extinguishing cavity 332. One end of the stationary arc-drawing angle 334 is connected to the contact portion 3231, and the other end of the stationary arc-drawing angle 334 is flush with one end of the second grid plate group 3362 away from the first grid plate group 3361. Alternatively, the other end of the stationary arc-drawing angle 334 extends beyond one end of the second grid plate group 3362 away from the first grid plate group 3361. Preferably, the other end of the stationary arc-drawing angle 334 can be bent and extended into the second arc-extinguishing cavity 332 and connect with the second arc-drawing cavity 332 away from the first grid plate group 3361. One end of the grid plate group 3362 is spaced apart from each other, and the middle part of the stationary arc-leading angle 334 covers the second arc inlet on the side of the second arc-extinguishing cavity 332 facing the rotating shaft 321. The stationary arc-leading angle 334 mainly cooperates with the second arc-extinguishing cavity 332 to facilitate the introduction of the electric arc into the second arc-extinguishing cavity 332 and improve the utilization rate of the arc-extinguishing grid plate 3360 in the second arc-extinguishing cavity 332. One end of the stationary arc-leading angle 334 is folded back to form a stationary arc-leading part 3341 and is connected to the side of the contact part 3231 with the stationary contact 3233. The end of the stationary arc-leading part 3341 is in contact with the edge of the stationary contact 3233. The stationary arc-leading angle 334 and the stationary contact plate 3230 are arranged in the same direction, occupying little space. The connection between the stationary arc-leading angle 334 and the edge of the stationary contact 3233 can effectively transfer the arc root quickly.

[0116] Preferably, the contact portion 3231 and the stationary arc-inducing portion 3341 are arranged at an angle to the first direction, such that the contact portion 3231 on the side opposite to the stationary contact 3233 is inclined to face the middle of the stationary arc-inducing angle 334, and the middle of the stationary contact plate 3230 is deflected at least once to form at least one inclined segment 3234. The inclined segment 3234 is spaced apart from the stationary arc-inducing portion 3341, so that the current flowing through the inclined segment 3234 is opposite to the current flowing through the stationary arc-inducing portion 3341. According to the principle of repulsion of opposite currents, a magnetic field that can drive the arc to move is generated, thereby improving the arc-inducing effect.

[0117] Preferably, an opening groove 3343 is also provided in the middle of the static arc-leading angle 334. The opening groove 3343 is located between the two ends of the static arc-leading angle 334 to shrink the arc root. Furthermore, the other end of the static arc-leading angle 334 forms a static sharp corner 3342. That is, the width of the static arc-leading angle 334 is the smallest at the end away from the static arc-leading corner 3341. Its width change is preferably gradually reduced. The magnetic field strength of the static sharp corner 3342 is strong, which is conducive to introducing the electric arc into the arc-extinguishing chamber 33.

[0118] Furthermore, one end of the stationary arc-drawing angle 334, which is away from the first arc-extinguishing cavity 331, extends beyond the tail end of the second grid plate group 3362, or one end of the stationary arc-drawing angle 334, which is away from the first arc-extinguishing cavity 331, is flush with the tail end of the second grid plate group 3362. Thus, the stationary arc-drawing angle 334 extends along the outer side of the second arc-extinguishing cavity 332, thereby improving the utilization rate of the grid plate group inside the second arc-extinguishing cavity 332.

[0119] Preferably, it also includes an arc-starting plate 335, which is used to connect the grid plates of the two arc-extinguishing chambers in series. One end of the arc-starting plate 335 is connected to the stationary contact plate 3230 near the wiring part 3232. The middle part of the stationary arc-starting plate 335 is bent and spaced opposite to the stationary arc-starting angle 334. The other end of the arc-starting plate 335 extends away from the stationary contact plate 3230, and the other end of the arc-starting plate 335 and the stationary arc-starting angle 334 are located on the same side of the stationary contact plate 3230. The arc-starting plate 335 and the stationary arc-starting angle 334 cooperate to facilitate the introduction of the arc on the stationary contact assembly into the arc-extinguishing chamber. When the stationary contact plate 3230 is provided with a mating area 3238, and the mating area 3238 is located in the first arc-extinguishing chamber 331, the arc-starting plate 334 passes through the mating area 3238.

[0120] Combination Figure 6 , 10 -17 provides the specific structure of the stationary contact assembly 323.

[0121] like Figure 11-13 As shown, the stationary contact assembly 323 includes a stationary contact plate 3230 and a stationary arc-quenching angle 334. The stationary contact plate 3230 is a straight plate shape arranged along a first direction, and the plane where the stationary contact plate 3230 is located is parallel to the plane enclosed by the first direction and the second direction. In this embodiment, the stationary contact plate 3230 is arranged along the outer side of one of the arc-quenching cavities (first arc-quenching cavity 331). The middle part of the stationary contact plate 3230 is deflected once on the same plane to form a horizontal segment 3235 and an inclined segment 3234. The horizontal segment 3235 is parallel to the first direction. A first transition segment 3236 is formed by bending one end of the horizontal segment 3235 away from the inclined segment 3234. In this embodiment, the first transition segment 3236 extends along a third direction that is perpendicular to both the first direction and the second direction. A wiring portion 3232 is formed by extending one edge of the first transition segment 3236 along the first direction away from the inclined segment 3234. Figure 13 In the middle, the wiring part 3232 is formed by extending the upper edge of the first transition section 3236, and the wiring part 3232 is provided with a wiring hole for connecting to a terminal block.

[0122] The end of the inclined segment 3234 that is away from the horizontal segment 3235 deviates from the first direction, and the end of the inclined segment 3234 that is away from the horizontal segment 3235 bends in the opposite direction to form the second transition segment 3237. The second transition segment 3237 and the inclined segment 3234 form an angle on the same plane. Figure 13In the figure, the second transition section 3237 and the inclined section 3234 are perpendicular to each other on the same plane. The contact portion 3231 is formed by bending and extending the end of the second transition section 3237. In the figure, the plane where the contact portion 3231 is located is perpendicular to the plane where the second transition section 3237 is located. The plane where the contact portion 3231 is located forms an angle with the first direction. The side of the contact portion 3231 facing the wiring portion 3232 is provided with a stationary contact 3233. In this embodiment, the contact portion 3231 and the wiring portion 3232 are spaced apart and opposite to each other on the same side plate 3303 surface of the stationary contact plate 3230.

[0123] The horizontal section 3235 and the inclined section 3234 are arranged along the outer side of the first arc-extinguishing cavity 331. When the current flows through the horizontal section 3235 and the inclined section 3234, a magnetic field can be generated, thereby providing driving force for the electric arc in the first arc-extinguishing cavity 331. It should be noted that an arc-blocking plate 337 is provided between the outer wall of the arc-extinguishing cavity and the stationary contact plate 3230.

[0124] like Figure 11 , 12 As shown in Figures 14-17, the static arc-drawing angle 334 is a straight plate shape parallel to the first direction. This straight plate structure can extend the arc-drawing distance. Furthermore, the static arc-drawing angle 334 extends along the line connecting the contact portion 3231 and the wiring portion 3232, resulting in a small overall space requirement. Preferably, the static arc-drawing angle 334 includes a plate-shaped body with varying widths at both ends, and the width of the plate-shaped body gradually changes. The plate-shaped body is positioned along the first direction. In the figures, the plane containing the plate-shaped body is parallel to the plane formed by the second and third directions. One end of the wider plate-shaped body is folded back to form the static arc-drawing portion 3341. The extension direction is parallel to the plane where the contact part 3231 is located. The stationary arc part 3341 is connected to the contact part 3231 and the edge of the stationary arc part 3341 is connected to the edge of the stationary contact 3233. There is no gap between the stationary arc part 3341 and the stationary contact 3233, so that the arc root at the stationary contact 3233 can be quickly and effectively transferred to the stationary arc angle 334. One end of the plate-shaped body with a smaller width serves as the stationary sharp corner part 3342. The plate-shaped body connected between the stationary sharp corner part 3342 and the stationary arc part 3341 has a strip-shaped opening groove 3343. The opening groove 3343 is used to shrink the arc root to improve the transfer speed of the arc root.

[0125] Furthermore, such as Figure 14 , 15 As shown, a convex hull 3344 is provided in the area of ​​the static arc-leading angle 334 between the static sharp corner 3342 and one end of the opening groove 3343. The convex hull 3344 is located on the side of the static arc-leading angle 334 opposite to the contact part 3231. The sharp corner shape of the static sharp corner 3342, combined with the convex hull 3344, makes the magnetic field strength in the corresponding area large and the magnetic field lines dense, which is conducive to guiding the electric arc.

[0126] Or, such as Figure 16 , 17 As shown in Figure 23, the stationary tip 3342 bends and extends to one side. In the figure, the stationary tip 3342 bends and extends along the second direction, so that the end of the stationary tip 3342 extends into the second arc-extinguishing cavity 332 and is opposite to the distance from the end of the second grid plate group 3362 away from the first arc-extinguishing cavity 331, which is also conducive to arc initiation.

[0127] On the other side of the first arc inlet 3301, there is a moving arc-drawing angle 333 that cooperates with the moving contact 322. The moving arc-drawing angle 333 and the stationary arc-drawing angle 334 are arranged on opposite sides of the first arc inlet 3301 at intervals. One end of the moving arc-drawing angle 333 extends into the first arc-extinguishing cavity 331 and connects with the grid plate group of the first arc-extinguishing cavity 331.

[0128] like Figure 4 , 18 As shown in Figure -23, the movable arc-drawing angle 333 includes a plate-shaped arc-drawing angle body. The middle part of the arc-drawing angle body is bent, so that the entire arc-drawing angle body presents a Z-shape. One end of the arc-drawing angle body is spaced apart from the arc-extinguishing grid plate 3360 near the first arc-entry port 3301. The other end of the arc-drawing angle body serves as the movable arc-drawing part 3331. The end of the movable arc-drawing part 3331 forms a movable tip 3332. The movable tip 3332 is folded back on one side of the first arc-entry port 3301 and faces the arc-drawing part. It should be noted that the widths of the movable arc-drawing part 3331 and the movable tip 3332 can be the same or different.

[0129] Furthermore, such as Figure 19 As shown, when the width of the movable arc portion 3331 is greater than that of the movable tip portion 3332, the movable arc portion 3331 can extend to form two extension arms, which are located on both sides of the movable tip portion 3332.

[0130] In this embodiment, the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 are perpendicular to each other and connected at one end. Of course, the included angle between the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 can also be other angles.

[0131] like Figure 4-7 As shown in Figures 20-26, the first arc-extinguishing cavity 331 is arranged along the second direction, that is... Figure 3 The second arc-extinguishing cavity 332 is positioned along the first direction, i.e., in the vertical direction. Figure 4In the left-right direction, the grid plate group disposed in the first arc-extinguishing cavity 331 is the first grid plate group 3361. The first grid plate group 3361 is spaced apart from the first arc inlet 3301. The first end of the first grid plate group 3361 is disposed along the first direction on one side of the first arc inlet. That is, the first grid plate group 3361 includes a plurality of arc-extinguishing grid plates 3360 disposed at intervals. Some of the arc-extinguishing grid plates 3360 are arranged on the side opposite to the first arc inlet 3301, and the other part is arranged at intervals in the second arc-extinguishing cavity 332 on the side of the first arc inlet 3301. In the figure, the plurality of arc-extinguishing grid plates 3360 opposite to the first arc inlet 3301 are arranged at intervals along the second direction and along the side of the first arc inlet 3301. Multiple arc-extinguishing grids 3360 are arranged at intervals along the first direction; the grid group disposed in the second arc-extinguishing cavity 332 is the second grid group 3362, which is disposed along the first direction. The first end of the second grid group 3362 is connected to the tail end of the first grid group 3362, and the first end of the second grid group 3362 and the first end of the first grid group 3361 correspond to the opposite sides of the first arc inlet, that is, the first ends of the first grid group 3361 and the second grid group 3362 are spaced apart and opposite each other in the second direction, and the tail end of the second grid group 3362 extends along the first direction. In other words, the second grid group 3362 includes multiple arc-extinguishing grids 3360 arranged at intervals in the first direction.

[0132] like Figure 24 , 26 As shown in Figures 32 and 33, the arc-extinguishing chamber 33 includes paired side plates 3303 and gas-generating components 3304. Each pair of side plates 3303 is spaced apart to form an arc-extinguishing chamber open on all four sides. Each pair of side plates 3303 is spaced apart in a third direction, which is... Figure 4 The direction perpendicular to the paper surface, Figure 33In the left and right directions, that is, the first direction, the second direction, and the third direction are perpendicular to each other, the gas generating elements 3304 are arranged in pairs between a pair of side plates 3303. Each pair of gas generating elements 3304 forms an arc-running channel 3302 that communicates with the first arc inlet 3301, and the arc-running channels 3302 of the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 are connected. The moving contact 322 moves towards or away from the stationary contact assembly 323 within the arc-running channel 3302 corresponding to the first arc inlet 3301. The two sides of each arc-extinguishing grid plate 3360 are connected to the side plates 3303 respectively. For example, on the edge of the arc-extinguishing grid plate 3360 The edge is provided with a protrusion, and the side plate 3303 is provided with a slot that engages with the protrusion. Each arc-extinguishing grid plate 3360 has an arc-extinguishing notch 33601 at one end. The arc-extinguishing notches 33601 of two adjacent arc-extinguishing grid plates 3360 are connected to form an arc-extinguishing channel. Support legs 33602 are formed on both sides of each arc-extinguishing notch 33601. The support legs 33602 are inserted into and enclosed by the gas generating component 3304. That is, the gas generating component 3304 is provided with a slot for the support legs 33602 to be inserted into, and the slot has a section of wrapping slot 33044, which wraps the end of the support leg 33602. See details. Figure 54 , 55 When the arc-extinguishing grid assembly is engaged with the side plate 3303 and the gas-generating component 3304, the arc-extinguishing grid plates 3360 at both ends of the grid assembly can block the openings at both ends of the side plate 3303. At this time, each arc-extinguishing chamber only has openings on two sides, with the first arc-extinguishing chamber 331 having its first arc inlet 3301 on its side opening. It should be noted that the length and width of the support legs 33602 of the arc-extinguishing grid plate 3360 can be adjusted according to actual needs. Of course, the arc-extinguishing grid plate 3360 can also be without support legs 33602. For details on the structure of the arc-extinguishing grid plate 3360, please refer to [link to relevant documentation]. Figures 34-36 .

[0133] like Figure 27-31 As shown, each gas generating component 3304 is also provided with multiple baffles 33041. Each baffle 33041 is spaced between the legs 33602 on the same side of two adjacent arc-extinguishing grid plates 3360. This can also be understood as forming a slot between two adjacent baffles 33041 that can be inserted into the leg 33602. Preferably, the end of the slot near the leg 33602 forms a wrapping slot 33044 (see...). Figure 54 , 55The end of the support leg 33602 is wrapped in the wrapping slot 33044. The width of each rib 33041 is smaller than the width of each support leg 33602, so that a gap as a slit 3305 is left between each rib 33041 and the side plate 3303. The slit 3305 corresponds to the area of ​​the support leg 33602 near the side plate 3303, thereby increasing the path of the arc on the surface of the arc extinguishing grid 3360, which is beneficial to compress the arc column, increase the arc movement trajectory and accelerate cooling.

[0134] Furthermore, such as Figures 32-33 As shown, the ribs 33041 of the two gas generating components 3304 are spaced apart to form a longitudinal slit 3306. The longitudinal slit 3306 corresponds to the arc extinguishing notch 33601 (arc extinguishing channel). One end of the longitudinal slit 3306 is connected to the arc running track 3302, and the other end extends beyond the middle edge of the arc extinguishing notch 33601. Preferably, the width of the longitudinal slit 3306 is smaller than the width of the arc extinguishing notch 33601 (arc extinguishing channel). The opening of the longitudinal slit 3306 at the end away from the arc running track 3302 gradually narrows, so that the cross-section of the longitudinal slit 3306 forms a trumpet shape. This structure with gradually changing width is conducive to driving the electric arc to enter quickly. With the cooperation of the gas generating component 3304 and the arc extinguishing grid plate 3360, the electric arc is compressed in the longitudinal slit 3306.

[0135] Preferably, the edge of the rib 33041 has a certain curvature or multiple straight segments connected at an angle, which is beneficial to extending the edge line of the slit 3305, thereby extending the edge lines of the slit 3305 and the longitudinal slit 3306, and thus extending the movement path of the electric arc.

[0136] Furthermore, at least one notch 33603 is provided on the middle edge of the arc-extinguishing notch 33601, such as... Figure 32 , 34 As shown in Figure 35, when the number of notches 33603 is one, the notch 33603 is a V-shaped notch 33603, and the central axis of the notch 33603 is offset from the central axis of the arc-extinguishing notch 33601, thereby causing the notches 33603 of two adjacent arc-extinguishing grid plates 3360 to be misaligned; as shown in Figure 35. Figure 33 , 36 As shown, when there are two or more notches 33603, the notches 33603 are U-shaped grooves. The central axis of one U-shaped groove is offset from the central axis of the arc-extinguishing notch 33601, and the central axis of the other U-shaped groove is set at an angle to the central axis of the arc-extinguishing notch 33601. The notches 33603 of two adjacent arc-extinguishing grid plates 3360 are also staggered. Of course, there can be multiple notches 33603, and the shape of the notches 33603 is not limited to V-shape and U-shape. In this embodiment, one end of the longitudinal slit 3306 also extends beyond the bottom edge of the notch 33603.

[0137] It should be noted that, as Figure 35 As shown, the arc-extinguishing grid plate 3360 does not have an arc-extinguishing notch 33601 or a support leg 33602. It can only have a notch groove 33603. In this case, the edges on both sides of the notch groove 33603 can be inserted into the gas generating component 3304. Usually, this type of arc-extinguishing grid plate 3360 is set in the first arc-extinguishing cavity 331 and is located on the side adjacent to the first arc inlet 3301.

[0138] like Figure 24 As shown, the first arc-extinguishing chamber 331 and the second arc-extinguishing chamber 332 share a pair of L-shaped side plates 3303, and a pair of gas-generating elements 3304 are arranged between the pair of L-shaped side plates 3303. Figure 24 The intermediate gas component 3304 also has an L-shaped structure, thus making the two arc-extinguishing chambers an integral structure, thereby forming an integral structure with two arc-extinguishing chambers in the arc-extinguishing chamber 33; of course, as Figure 25 As shown, each arc-extinguishing chamber is formed by a pair of side plates 3303, each side plate 3303 being rectangular. A pair of gas-generating elements 3304 are disposed between each pair of side plates 3303. Each gas-generating element 3304 is approximately rectangular in structure, and its width is smaller than the width of the side plate 3303. The two arc-extinguishing chambers are connected at one end to form a split-type arc-extinguishing chamber 33. Additionally, as... Figure 26 , 27 As shown, the split-type arc-extinguishing chamber 33 can also use a pair of L-shaped gas-generating components 3304.

[0139] Furthermore, the arc-quenching grids 3360 in the first grid group 3361 and the second grid group 3362 are preferably arranged at an angle, and the included angle is set according to actual needs. Figure 20-23 In the first grid plate group 3361, the arc-extinguishing grid plate 3360 opposite to the first arc inlet 3301 extends at a slight angle to the first direction. The arc-extinguishing grid plate 3360 located on one side of the first arc inlet 3301 in the first grid plate group 3361 extends at an angle to the second direction. The arc-extinguishing grid plate 3360 of the second grid plate group 3362 extends at an angle to the second direction.

[0140] In this embodiment, the distance between the first arc-extinguishing cavity 331 and the first arc-inlet is less than the length between the first end and the last end of the second grid plate group 3362. That is, the width of the first arc-extinguishing cavity 331 is less than the length of the second arc-extinguishing cavity 332. By increasing the length of the second arc-extinguishing cavity 332, it is convenient to increase the number of arc-extinguishing grid plates 3360 in the second grid plate group 3362, which is beneficial for improving the arc-extinguishing capability. The grid plate groups in the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 are connected in series, which facilitates the introduction of the arc from the first arc-extinguishing cavity 331 into the second arc-extinguishing cavity 332. Figure 3 , 20As shown in Figures 21, 26, and 27, an arc-initiating plate 335 is provided at the junction of the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332. The first end of the arc-initiating plate 335 is located inside the first arc-extinguishing cavity 331, and is spaced apart from an arc-extinguishing grid 3360 (an arc-extinguishing grid 3360 at the tail end of the first grid group 3361) near the second arc-extinguishing cavity 332. The second end of the arc-initiating plate 335 is located in the second arc-extinguishing cavity 332. Inside, the other end of the arc-initiating plate 335 is spaced apart from an arc-extinguishing grid 3360 (an arc-extinguishing grid 3360 at the head end of the second grid group 3362) near the first arc-extinguishing cavity 331. Alternatively, the two ends of the arc-initiating plate 335 can be considered as one of the arc-extinguishing grids 3360 located at the end position of the first grid group 3361 and the second grid group 3362, respectively. The arc-initiating plate 335 is V-shaped or Z-shaped, and the specific shape can be selected according to actual needs.

[0141] Or, such as Figure 4 , 22 As shown in -24, a connecting grid plate group 3363 is provided at the junction of the first arc extinguishing cavity 331 and the second arc extinguishing cavity 332. The connecting grid plate group 3363 includes a plurality of connecting grid plates arranged at intervals. Preferably, the connecting grid plate group 3363 is arranged in a fan-shaped structure, thereby connecting the first grid plate group 3361 and the second grid plate group 3362.

[0142] In addition, such as Figure 6 As shown, the arc-extinguishing chamber 33 also includes an arc-isolating plate 337. Preferably, the arc-isolating plates 337 are arranged in pairs outside the side plate 3303. The arc-isolating plates 337 at least cover the first arc-extinguishing cavity 331 and the connection between the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332. When the arc-extinguishing chamber 33 is installed in the casing of the circuit breaker, the arc-isolating plates 337 are located between the middle of the stationary contact plate 3230 and the side wall to achieve the isolation function.

[0143] like Figure 4 , 20As shown in Figure -23, one end of the dynamic arc-inducing angle 333 and the static arc-inducing angle 334 are spaced apart and positioned opposite each other on opposite sides of the first arc inlet 3301. The other end of the dynamic arc-inducing angle 333 is connected to the grid plate group in the first arc-extinguishing cavity 331. In this embodiment, the other end of the dynamic arc-inducing angle 333 is spaced apart and positioned adjacent to an arc-extinguishing grid plate 3360 of the first grid plate group 3361 adjacent to the first arc inlet 3301. The other end of the static arc-inducing angle 334 extends along the outer side of the second arc inlet of the second arc-extinguishing cavity 332 in a direction away from the first arc-extinguishing cavity 331. The maximum distance from the static arc-inducing angle 334 to the grid plate group in the second arc-extinguishing cavity 332 is less than the distance between the second end of the arc-inducing plate 335 and the static arc-inducing angle 334. This ensures smooth airflow while preventing the grid plate group in the second arc-extinguishing cavity 332 from becoming ineffective due to excessively small electrical clearance between the static arc-inducing angle 334 and the second end of the arc-inducing plate 335. Figure 20 In the middle, the distance from the middle of the static arc angle 334 to the middle of the second grid group 3362 is the largest, and this distance is denoted as D2. The distance between the second end of the arc and the first end of the static arc angle 334 is denoted as D1, where D1 > D2.

[0144] Furthermore, the distance between the end of the second grid plate group 3362 away from the first arc-extinguishing cavity 331 and the stationary arc-drawing angle 334 gradually decreases. Specifically, the edge of the arc-extinguishing notch 33601 in the second grid plate group 3362 away from the opening gradually approaches the stationary arc-drawing angle 334, so that the arc-extinguishing channel of the second grid plate group 3362 gradually approaches the stationary arc-drawing angle 334 in the direction away from the first arc-extinguishing cavity 331. This forms a voltage gradient, which is beneficial for the arc to erode the end of the second grid plate group 3362 away from the first arc-extinguishing cavity 331.

[0145] In this embodiment, if Figure 3 , 4As shown in Figures 7-9, the housing 31 has a first exhaust port 3111 and a second exhaust port 3112 on opposite sides. The first exhaust port 3111 and the second exhaust port 3112 are respectively connected to the first arc-extinguishing chamber 331 and the second arc-extinguishing chamber 332. The lowest point of the first exhaust port 3111 is higher than the highest point of the second exhaust port 3112, which is conducive to forming a pressure difference and promoting gas flow. The first exhaust port 3111 is connected to the side of the first arc-extinguishing chamber 331 opposite to the second arc-extinguishing chamber 332. The first exhaust port 3111 and the first arc inlet 3301 correspond to opposite sides of the first arc-extinguishing chamber 331, that is, the first exhaust port 3111 is connected to the side of the first arc-extinguishing chamber 331 opposite to the contact system. The first exhaust port 3111 is located at the corner of the housing 31. The arc-extinguishing grid plates 3360 of the first grid plate group 3361 are inclined in a direction that facilitates exhaust, that is, some of the arc-extinguishing grid plates 3360 in the first grid plate group 3361 are inclined towards the first exhaust port 3111. The second exhaust port 3112 is connected to the end of the second arc-extinguishing chamber 332 that is opposite to the first arc-extinguishing chamber 331. That is, the first exhaust port 3111 and the second exhaust port 3112 are located on opposite sides of the arc-extinguishing chamber 33. Preferably, the arc-extinguishing grid plates 3360 of the second grid plate group 3362 are inclined in a direction that facilitates exhaust, that is, some of the arc-extinguishing grid plates 3360 in the second grid plate group 3362 are inclined towards the second exhaust port 3112. In addition, the inclination angle of the arc-extinguishing grid plates 3360 in the first grid plate group 3361 and the second grid plate group 3362 can be set according to actual needs.

[0146] Preferably, the inner diameter of the first exhaust port 3111 is smaller than the inner diameter of the second exhaust port 3112. This makes it easier for the exhaust gas of the arc-extinguishing chamber 33 to be discharged from the second exhaust port 3112, thereby improving the utilization rate of the second arc-extinguishing chamber 332. Both the first exhaust port 3111 and the second exhaust port 3112 are equipped with at least one anti-freezing element 338 to achieve zero arc flash. Furthermore, a protruding post 312 is provided in the housing 31 between the second exhaust port 3112 and one end of the second arc-extinguishing chamber 332. The protruding post 312 can play the role of dispersing airflow and eliminating free ionization. Screws can be provided inside the protruding post 312 to fix the two partitions 310 into one piece.

[0147] Furthermore, such as Figure 4 , 8 As shown, an exhaust groove 3113 is formed between the second arc-extinguishing chamber 332 (opposite to the contact system 32) and the housing 31. In the second direction, the second arc-extinguishing chamber 332 is located between the exhaust groove 3113 and the stationary arc-starting angle 334. The opening of the exhaust groove 3113 near the second exhaust port 3112 gradually increases, which facilitates the formation of a pressure gradient and gas outflow. Figure 4As shown, the exhaust groove 3113 includes a first exhaust groove 3113a and a second exhaust groove 3113b that are connected to each other. The first exhaust groove 3113a is disposed along a first direction on the side of the second arc-extinguishing cavity 332 opposite to the rotating shaft 321. The opening of the first exhaust groove 3113a gradually increases in the direction away from the first arc-extinguishing cavity 331. That is, the opening width of the first exhaust groove 3113a is the largest near the second exhaust port 3112. The second exhaust groove 3113b is located at the junction of the second arc-extinguishing cavity 332 and the first arc-extinguishing cavity 331. When the grid plates of the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 are connected in series through the connecting grid plate group 3363, preferably, the second exhaust groove 3113b is a fan-shaped groove. It should be noted that when the conductive unit 3 is not provided with a housing 31, the exhaust groove 3313 is located between the side of the second arc-extinguishing cavity 332 opposite to the rotating shaft 321 and the outer shell.

[0148] In this embodiment, as Figure 2-5 As shown, the moving contact assembly is connected to the terminal block via a connecting plate 34. The accessory module 35 is a trip unit that cooperates with the operating mechanism 2. The trip unit includes a thermomagnetic trip assembly 351 and an adjustable trip assembly 352. The thermomagnetic trip assembly 351 is fixedly connected to the connecting plate 34 by screws. In the second direction, the adjustable trip assembly 352 is installed above the thermomagnetic trip assembly. The thermomagnetic trip assembly 351, the adjustable trip assembly 352, and the operating mechanism 2 can adopt existing technology. The adjustable trip assembly 352 can adjust the magnitude of the tripping current. When a fault current occurs in the circuit, it will promptly trip the operating mechanism 2.

[0149] In this embodiment, the adjustable tripping component 352 cooperates with the operating mechanism 2. Correspondingly, part of the adjustable tripping component 352 is located inside the outer shell outside the housing 31, so that the housing 31, the operating mechanism 2 and the adjustable tripping component 352 are encapsulated and fixed by splicing the cover 11 and the base 12 in the second direction.

[0150] Combination Figure 39-62 A second embodiment of the circuit breaker is provided.

[0151] like Figures 39-48As shown, the circuit breaker includes a housing, within which an operating mechanism 2 and two conductive units 3 are disposed. Similar to the first embodiment, the operating mechanism 2 adopts existing technology. The two conductive units 3 are arranged side by side in a third direction. Each conductive unit 3 includes a pair of terminals, a contact system, an arc-extinguishing system, and an accessory module 35. Similar to the first embodiment, the pair of terminals are spaced apart in a first direction. The contact system 32 is connected between the pair of terminals. The contact system 32 includes a moving contact assembly and a stationary contact assembly 323 that cooperate with each other. The moving contact assembly is the same as in the first embodiment. The arc-extinguishing system includes an arc-extinguishing chamber 33. The arc-extinguishing chamber includes two arc-extinguishing cavities the same as in the first embodiment, namely, a first arc-extinguishing cavity 331 and a second arc-extinguishing cavity 332. The stationary contact assembly 323 is disposed along the first direction and penetrates through the first arc-extinguishing cavity 331.

[0152] like Figures 39-48 As shown in Figures 56-62, the stationary contact assembly 323 includes a stationary contact plate 3230 and a stationary arc-quenching angle 334. The stationary contact plate 3230 is a straight plate oriented in a first direction. The plane containing the stationary contact plate 3230 is parallel to the plane enclosed by the first direction and the third direction. The stationary contact plate 3230 is disposed through an arc-quenching cavity. In this embodiment, the stationary contact plate 3230 is disposed through a first arc-quenching cavity 331. A through hole is formed in the middle of the stationary contact plate 3230 as a mating area 3238. The mating area 3238 is formed in the first arc-quenching cavity 331 and connected to the second arc-quenching cavity 332. The connecting port is open, and the inner diameter of the connecting port is smaller than the inner diameter of the first arc inlet 3301, thereby forming a pressure difference, which is conducive to airflow. One end of the stationary contact plate 323 is folded back and extended to form a contact portion 3231. The contact portion 3231 is spaced apart from the plate surface of the stationary contact plate 3230, and at least a part of the contact portion 3231 corresponds to the mating area 3239. The side of the contact portion 3230 facing away from the mating area 3238 is provided with a stationary contact point 3233. The other end of the stationary contact plate 3230 is provided with a wiring hole as a wiring portion 3232. The wiring portion 3232 is used to connect to an adjacent wiring terminal.

[0153] like Figures 39-48 As shown in Figures 56-58 and 61, the stationary contact assembly 323 further includes an arc-inducing plate 335, which is disposed on opposite sides of the mating area 3238 at a distance from the stationary arc-inducing portion 3341. Figures 41-48In 56, 58, and 61, the arc-initiating plate 335 is generally L-shaped. One end of the arc-initiating plate 335 is connected to the area of ​​the stationary contact plate 3230 near the wiring part 3232. The other end of the arc-initiating plate 335 extends away from the stationary contact plate 3230 after passing through the mating area 3238, so that the gap between the arc-initiating plate 335 and the stationary arc-initiating part 3341 forms an airflow channel 3239 of a certain length. The arc-initiating protrusion 33410 corresponds to the opening of the airflow channel 3239. The arc-initiating protrusion 33410 narrows the inlet 32391 of the airflow channel 3239, so that the inner diameter of the inlet 32391 of the airflow channel 3239 is smaller than the inner diameter of the outlet 32392 of the airflow channel 3239. Figure 41 In this diagram, D1 represents the distance from the moving contact assembly to the main grid plate group, D2 represents the inner diameter of the inlet 32391, D3 represents the inner diameter of the outlet 32392, and D4 represents the minimum distance from the stationary arc angle 334 to the second grid plate group 3362 in the second direction. Where D1 ≥ D2 and D4 ≤ D2 ≤ D3, the airflow channel 3239 is funnel-shaped in the second direction, which facilitates the formation of a pressure difference and accelerates gas flow. In this embodiment, the middle part of the stationary arc angle 334 is located on the positioning rib 33043 on the second arc-extinguishing cavity 332.

[0154] Combination Figures 39-48 56-59 provides a structure for the static contact plate 3230 applied in this embodiment, such as... Figure 59 As shown, the stationary contact plate 3230 has a straight plate structure. A through hole is provided in the middle of the stationary contact plate 3230 as a mating area 3238. One end of the stationary contact plate 3230 is folded back and extended to form a contact part 3231. The other end of the stationary contact plate 3230 serves as a wiring part 3232 and is provided with a wiring hole. Figure 59 In this embodiment, the width of the connecting section 32311 between the contact portion 3231 and the stationary contact plate 3230 is smaller than the width of the stationary contact plate 3230 but larger than the width of the contact portion 3231. The side of the contact portion 3231 facing away from the stationary contact plate 3230 is provided with a stationary contact point 3233. The contact portion 3231 extends outward at an angle away from the plate surface of the stationary contact plate 3230, so that there is an assembly gap between the contact portion 3231 and the stationary contact plate 3230. A magnetic yoke 339 can be provided in the assembly gap. When current flows through the contact portion 3231, the magnetic yoke 339 cooperates with the magnetizing component 3391 of the arc extinguishing system to generate a magnetic field. The arc generated by the breakage is driven by the Lorentz force in the magnetic field to move into the arc extinguishing chamber 33. At least a part of the contact portion 3231 corresponds to the mating area 3238. In this embodiment, the end of the contact portion 3231 corresponds to the end of the mating area 3238 away from the wiring portion 3232.

[0155] Combination Figure 48 , 56-58 and 60 provide a static arc-leading angle 334 structure applied in this embodiment. The static arc-leading angle 334 is a straight plate shape parallel to the first direction. The straight plate shape structure can extend the arc-leading distance, and the static arc-leading angle 334 extends along a direction parallel to the static contact plate 3230, occupying a small overall space. Preferably, one end of the static arc-leading angle 334 is folded back to form a static arc-leading portion 3341. The static arc-leading portion 3341 passes through the mating area 3238 of the static contact plate 3230 and connects with the contact portion 3231. The edge of the static arc-leading portion 3341 connects with the edge of the static contact point 3233. There is no gap between the static arc-leading portion 3341 and the static contact point 3233, so that the arc root at the static contact point 3233 is quickly and effectively transferred to the static arc-leading angle 334. The other end of the static arc-leading angle 334 is provided with a static sharp corner portion 3342, and the width of the static sharp corner portion 3342 is minimal. Figure 48 In the middle, the stationary tip 3342 bends and extends to one side, that is, the stationary tip 3342 bends and extends along the second direction, so that the end of the stationary tip 3342 can be spaced opposite to the grid plate group in the arc extinguishing chamber 33, which is also conducive to arc initiation.

[0156] Specifically, such as Figure 48 As shown, in this embodiment, the static arc angle 334 is a strip-shaped straight plate. One end of the static arc angle 334 is folded back to form the static arc portion 3341, and the other end of the static arc angle 334 is bent to form the static sharp corner portion 3342. The static arc angle 334 and the static sharp corner portion 3342 are located on opposite sides of the plate surface of the static arc angle 334. Figure 56 , 57 In configuration 60, the width of the stationary sharp corner portion 3342 is the smallest, and its width is preferably reduced gradually to maximize the magnetic field strength of the stationary sharp corner portion 3342, which is beneficial for arc initiation; furthermore, the middle part of the stationary arc-initiating portion 3341 is bent at least once to form the arc-initiating protrusion 33410. Figure 60 In the middle section of the stationary arc portion 3341, the middle part is bent once, making the entire stationary arc portion 3341 into a hook shape. The stationary arc portion 3341 includes a first segment 33411, a second segment 33412, and a third segment 33413 connected in sequence. The first segment 33411 is connected to the contact portion 3231 to form a contact point, and the end of the first segment 33411 is connected to the edge of the stationary contact 3233 to avoid leaving a gap between them. The three segments 33413 obliquely pass through the mating area 3238 and connect with the stationary contact plate 3230 to form the second contact point. The second segment 33412 and the third segment 33413 are connected at an angle, and the connection point between the second segment 33412 and the third segment 33413 serves as the arc-initiating protrusion 33410. The arc-initiating protrusion 33410, the first segment 33411, and the second segment 33412 are all located on the same side of the stationary contact plate 3230 as the stationary contact point 3233. It should be noted that the second contact point can be connected to the stationary arc-initiating part 3341 and the stationary contact plate 3230 at other locations.

[0157] Of course, the static arc angle 334 in this embodiment can also adopt the structure of the static arc angle 334 in the first embodiment.

[0158] like Figures 56-58 As shown in Figure 61, the stationary contact assembly 323 also includes an arc-inducing plate 335, which is disposed on opposite sides of the mating area 3238 at a distance from the stationary arc-inducing portion 3341. Figures 56-58 In section 61, the arc-initiating plate 335 is generally L-shaped. One end of the arc-initiating plate 335 is connected to the area of ​​the stationary contact plate 3230 near the wiring section 3232. The other end of the arc-initiating plate 335 extends away from the stationary contact plate 3230 after passing through the mating area 3238, so that the gap between the arc-initiating plate 335 and the stationary arc-initiating section 3341 forms an airflow channel 3239 of a certain length. The arc-initiating protrusion 33410 corresponds to the opening of the airflow channel 3239. The arc-initiating protrusion 33410 narrows the inlet 32391 of the airflow channel 3239, so that the inner diameter of the inlet 32391 of the airflow channel 3239 is smaller than the inner diameter of the outlet 32392 of the airflow channel 3239. Figure 41 , 58 In the diagram, D2 represents the inner diameter of the inlet 32391, and D3 represents the inner diameter of the outlet 32392. D3 > D2. At this time, the airflow channel 3239 is funnel-shaped in the second direction, which is conducive to forming a pressure difference and accelerating the gas outflow.

[0159] In this embodiment, one end of the arc-initiating plate 335 passes through the mating area 3328 and connects to the stationary contact plate 3230 near the wiring part 3232. The arc-initiating plate 335 and the stationary arc-initiating angle 334 are located on opposite sides of the mating area 3238. That is, the arc-initiating plate 335 and the stationary arc-initiating angle 334 are spaced apart and opposite each other in the first direction. The other end of the arc-initiating plate 335 extends in a direction away from the stationary contact plate 3230. The other end of the arc-initiating plate 335 and the stationary arc-initiating angle 334 are located on the same side of the stationary contact plate 3230. The stationary arc-initiating angle 334 and the arc-initiating plate 335 are located on opposite sides of the mating area 3328 (connection port) in the first direction. The arc-initiating plate 335 and the stationary arc-initiating angle 334 cooperate to initiate the arc, which is beneficial to introduce the arc on the stationary contact assembly 323 into the arc-extinguishing chamber 33.

[0160] In addition, such as Figures 41-47 As shown, the arc-starting plate 335 is also used to connect the adjacent ends of the grid plate groups in the two arc-extinguishing cavities together. That is, one end of the arc-starting plate 335 is located in the first arc-extinguishing cavity and is fixedly mounted on the stationary contact plate 3230, so that it is spaced apart from one end of the first grid plate group, and the other end extends into the second arc-extinguishing cavity 332 and is spaced apart from one end of the second grid plate group.

[0161] It should be noted that the area of ​​the stationary arc-leading angle 334 near the stationary arc-leading part 3341 is fixedly connected to the stationary contact plate 3230, thereby ensuring the connection stability between the stationary contact plate 3230 and the stationary arc-leading angle 334; similarly, the arc-leading plate 335 and the stationary contact plate 3230 are also fixedly connected.

[0162] like Figure 48 , 56 As shown in -58 and 62, the stationary contact assembly 323 also includes an arc-blocking cover, which covers at least one side of the stationary contact plate 3230. That is, the arc-blocking cover and the stationary contact are located on the same side of the stationary contact plate 3230. When the stationary contact plate 3230 is disposed through the arc-extinguishing cavity, the arc-blocking cover can isolate the electric arc from the stationary contact plate 3230 and prevent the electric arc from eroding the stationary contact plate 3230.

[0163] In this embodiment, the arc-blocking cover is divided into a first arc-blocking cover 3241 and a second arc-blocking cover 3242. The first arc-blocking cover 3241 covers one end of the stationary contact plate 3230 away from the wiring portion 3232, that is, the first arc-blocking cover 3241 wraps around the outside of the connecting section 32311. The second arc-blocking cover 3242 has a groove 32425 in the middle corresponding to the mating area 3238. The second arc-blocking cover 3242 has a baffle 32422 near the edge of the wiring portion 3232. The baffle 32422 can cooperate with the arc-extinguishing chamber 33 in the circuit breaker to prevent the arc from affecting the wiring portion 3232. The second arc-blocking cover 3242 covers the plate surface of the stationary contact plate 3230 located between the wiring portion 3232 and the contact portion 3231. That is, at least one side of the area of ​​the stationary contact plate 3230 passing through the arc-extinguishing chamber is covered by the second arc-blocking cover 3242. Figures 56-58 In the middle, the second arc shield 3242 covers the side of the stationary contact plate 3230 facing the first grid plate group 332, and the second arc shield 3242 wraps around most of the area of ​​the stationary contact plate 3230 to prevent the electric arc from eroding the stationary contact plate 3230.

[0164] Preferably, Figure 62As shown, the edge of the second arc shield 3242 is also provided with an arc-inducing structure. At least part of the arc-inducing structure is arranged around the groove 32425, and the arc-inducing structure extends on the side of the stationary contact plate 3230 opposite to the contact portion 3231, which is conducive to guiding the arc flow. At the same time, the arc-inducing structure can also cooperate to form a structure of narrow inlet 32391 and wide outlet 32392 in the airflow channel 3239. At least part of the arc-inducing structure is formed by extending from the edge of the groove 32425. The arc-inducing structure includes an extension 32421 and / or an arc-inducing support leg 32423. The extension 32421 and the stationary arc-inducing portion 3341 are spaced opposite each other in the mating area 3238. The end of the extension 32421 extends on the side of the stationary contact plate 3230 opposite to the contact portion 3231. The arc-inducing plate 335 can be arranged along the extension 32421. The arc-inducing support leg 32423 extends along the edge of the groove 32425. The groove 32425 is provided on both sides of the opposite edge. The gap between the two arc-leading legs 32423 is the largest at the position away from the stationary contact plate 3230. For example, the end of each arc-leading leg 32423 is provided with an inclination angle so that the opposite side of the two arc-leading legs 32423 is a slope. This achieves the maximum gap between the two arc-leading legs 32423 at the position away from the stationary contact plate 3230. Of course, the end of each arc-leading leg 32423 can also be bent outward. In this way, based on the gap between the arc-leading protrusion 33410 and the arc-leading plate 335 having a narrow inlet 32391 and a wide outlet 32392 in the second direction, combined with the gap of the two arc-leading legs 32423 in the third direction, the airflow channel 3239 is further made to form a trumpet-shaped structure with a narrow inlet 32391 and a wide outlet 32392. Of course, the extension 32421 and the arc-starting leg 32423 can be provided at different times, that is, only the extension 32421 can be provided, or only the arc-starting leg 32423 can be provided.

[0165] Furthermore, the arc-inducing structure also includes a support portion 32424, which is formed by extending from the edge of the second arc-isolating cover 3242. Each support portion 32424 and an adjacent arc-inducing leg 32423 form a receiving space. The stationary contact plates 3230 located on both sides of the mating area 3238 are correspondingly arranged in the receiving space, so that the second arc-isolating cover 3242 can be mounted on the stationary contact plate 3230.

[0166] In this embodiment, as Figure 62 As shown, the second arc-blocking cover 3242 includes a plate-shaped body 32420. The middle part of the body 32420 is provided with a groove 32425 corresponding to the mating area 3238, so that the body 32420 has an overall U-shaped structure. The body 32420 on both sides of the groove 32425 is attached to the stationary contact plate 3230 as a mounting arm. Figure 62In the middle, each mounting arm has an arc-leading support leg 32423 on its inner edge and a support portion 32424 on its outer edge. The length of the arc-leading support leg 32423 is greater than the length of the support portion 32424, forming an accommodating space between the arc-leading support leg 32423 and the support portion 32424. One end of the body 32420 is provided with a baffle 32422. The baffle 32422 is arranged adjacent to the extension portion 32421 along a direction perpendicular to the body 32420, but the baffle 32422 and the extension portion 32421 extend on both sides of the plate surface of the body 32420, respectively.

[0167] In this embodiment, the arc extinguishing system can be further improved based on the first embodiment, such as... Figure 49 , 53 As shown, the gas generating component 3304 is provided with a mounting groove 33042. A magnetizing component 3391 can be installed within the mounting groove 33042. The magnetizing component 3391 corresponds to both sides of the arc inlet. The magnetizing component 3391, in conjunction with other components, generates a magnetic field, causing the arc generated when the moving contact assembly and the stationary contact assembly 323 separate, to continue entering the arc extinguishing chamber from the arc inlet under the drive of the Lorentz force. Of course, if the magnetizing component 3391 is not provided, the mounting groove 33042 can be omitted. Additionally, as... Figures 50-55 As shown, the second arc-extinguishing cavity 332 is provided with positioning ribs 33043. Figure 51 In the middle, the positioning rib 33043 is disposed on one side opposite to the two pairs of gas generating components 3304. The positioning rib 33043 provides a support position for the static arc angle 334. In this embodiment, the middle part of the static arc angle 334 is disposed on the positioning rib 33043.

[0168] like Figure 52 As shown, the arc-extinguishing grid 3360 is provided with multiple notches and slots 33603. Figure 50 In the middle, multiple notches and slots 33603 form a crown-shaped structure, which makes the electric field intensity at the sharp corners stronger, which is conducive to guiding the electric arc into the grid assembly.

[0169] Combination Figures 42-46 The arc extinguishing process is described in the diagram, where the black arc represents the electric arc.

[0170] like Figure 42 As shown, when the moving contact assembly and the stationary contact assembly 323 just separate, under the action of a strong electric field, the air between the moving contact assembly and the stationary contact assembly 323 is broken down and an electric arc is generated. The temperature between the moving contact assembly and the stationary contact assembly 323 rises rapidly, the gas expands due to heat, and the gas generating element 3304 begins to generate gas. Under the action of airflow and magnetic field, the arc root begins to move to the first segment 33411 of the stationary arc angle 334, and the arc column becomes bent.

[0171] like Figure 43As shown, when the moving contact assembly is opened to half the angle, the arc root moves to the second segment 33412 of the stationary arc angle 334 under the action of airflow and magnetic field. Since the first arc extinguishing cavity 331 in the arc extinguishing chamber 33 corresponds to the first exhaust port 3111, the arc tends to move towards the first grid plate group 3361. Since the stationary contact assembly 323 is provided with an airflow channel 3239, the arc also tends to move towards the airflow channel 3239.

[0172] like Figure 44 As shown, when the moving contact assembly continues to open, the electric arc has entered the first arc-extinguishing chamber 331 under the action of airflow and magnetic field, and is cut by the main grid plate group of the first grid plate group 3361. The arc root moves to the inlet 32391 of the airflow channel 3239. Since the inner diameter of the inlet 32391 is smaller than the inner diameter of the outlet 32392, the electric arc breaks down at the arc inlet 3301 and connects with the arc-initiating plate 335, and returns to the moving contact assembly through the electric arc of the secondary grid plate group.

[0173] like Figure 45 As shown, when the moving contact assembly is opened to its maximum, the stationary arc-inducing section 3341 in the stationary contact assembly 232 is at the same potential. That is, the second segment 33412 and the third segment 33413 of the stationary arc-inducing section 3341 are at the same potential. Therefore, the arc root will move rapidly to the third segment 33413 of the stationary arc-inducing section 3341 under the action of the electrodynamic force, and connect to the first grid plate group 3361 in the first arc-extinguishing cavity 331 through the arc-inducing plate 335. At this time, the electric arc in the airflow channel 3239 moves to the outlet 32392. At the same time, because the moving contact assembly is opened to its maximum, under the action of the moving arc-inducing angle 333, the electric arc is quickly connected in series through the main grid plate group and the auxiliary grid plate group. Under the action of the first grid plate group 3361 in the first arc-extinguishing cavity 331 and the magnetic field, the electric arc is quickly sucked into the grid plate group and cut into a short arc. Thus, the first grid plate group 3361 in the first arc-extinguishing cavity 331 is fully utilized.

[0174] like Figure 46As shown, the moving contact assembly has been opened to its maximum. Since the inner diameter of the outlet 32392 of the airflow channel 3239 is much smaller than the inner diameter of the second exhaust port 3112, most of the exhaust gas in the arc-extinguishing chamber 33 is discharged from the second exhaust port 3112. In addition, in this embodiment, D1 represents the distance from the moving contact assembly to the main grid plate group, D2 represents the inner diameter of the inlet 32391, D3 represents the inner diameter of the outlet 32392, and D4 represents the minimum distance from the static arc angle 334 in the second direction to the second grid plate group 3362, where D1≥D2, D4≤D2≤D3. Since D4 is much smaller than D2 and D3, and the second grid plate group 3362 has a voltage gradient and the exhaust groove 3113 has a pressure gradient, the electric arc at the outlet 32392 of the airflow channel 3239 will quickly enter the second arc-extinguishing chamber and be cut into a short arc. Thus, the second grid plate group 3362 in the second arc-extinguishing chamber 332 is fully utilized.

[0175] In this embodiment, the arc-initiating plate 335 connects the arc airflow of the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 in series. The arc-initiating plate 335 plays the roles of arc initiation, arc running, and series connection in this process. Additionally, as... Figure 46 As shown, each conductive unit has a housing 31, and the gas flow process mainly takes place inside the housing 31 at the positions corresponding to the two arc-extinguishing chambers. When the housing 31 is not provided, the gas flow process takes place inside the outer shell corresponding to the two arc-extinguishing chambers.

[0176] 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.

[0177] 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, wherein an operating mechanism (2) and at least one conductive unit (3) are disposed within the housing, the conductive unit (3) comprising a contact system (32), an arc-extinguishing chamber (33), and an accessory module (35), the contact system (32) comprising a moving contact assembly and a stationary contact assembly (323), characterized in that: The arc-extinguishing chamber (33) includes a first arc-extinguishing cavity (331) and a second arc-extinguishing cavity (332) that are at an angle to each other and connected at one end. The accessory module (35), the operating mechanism (2), the moving contact assembly and the first arc-extinguishing cavity (331) are arranged side by side in a first direction. The stationary contact assembly (323) extends along the first direction to the junction of the first arc-extinguishing cavity (331) and the second arc-extinguishing cavity (332). In the second direction, the stationary contact assembly (323) is located on the side of the second arc-extinguishing cavity (332) facing the operating mechanism (2), the moving contact assembly and the accessory module (35). The first direction and the second direction are perpendicular to each other.

2. The circuit breaker according to claim 1, characterized in that... Each conductive unit (3) also includes a pair of terminals, each pair of terminals being spaced apart at opposite ends of the housing along a first direction, and the contact system (32) being electrically connected between the pair of terminals.

3. The circuit breaker according to claim 1, characterized in that: The conductive unit (3) also includes a housing (31), the space inside the housing (31) is divided into four mounting cavities, three of which are arranged side by side in the first direction. The accessory module (35), the contact system (32) and the first arc extinguishing cavity (331) are respectively arranged in the three side by side mounting cavities. The other mounting cavity is used to set the second arc extinguishing cavity (332) and is arranged side by side with the three mounting cavities in the second direction. The mounting cavity used to assemble the second arc extinguishing cavity (332) has the longest length in the first direction.

4. The circuit breaker according to claim 3, characterized in that: The housing (31) has a clearance groove in the middle, and the operating mechanism (2) passes through the clearance groove and is driven to connect with the moving contact assembly.

5. The circuit breaker according to claim 3, characterized in that: The housing (31) has a first exhaust port (3111) and a second exhaust port (3112) spaced apart in a first direction on opposite sides. The lowest point of the first exhaust port (3111) is higher than the highest point of the second exhaust port (3112), and the inner diameter of the first exhaust port (3111) is smaller than the inner diameter of the second exhaust port (3112). The first exhaust port (3111) is connected to the side of the first arc-extinguishing cavity (331) opposite to the contact system, and the second exhaust port (3112) is connected to the end of the second arc-extinguishing cavity (332) away from the first arc-extinguishing cavity (331). Both the first exhaust port (3111) and the second exhaust port (3112) are equipped with at least one anti-freezing element (338).

6. The circuit breaker according to claim 5, characterized in that: The housing (31) includes a pair of mutually covering partitions (310), the contact system (32) and the arc-extinguishing chamber (33) are disposed in the space between the pair of partitions (310), and a protrusion (312) is provided in the housing (31) between the second exhaust port (3112) and one end of the second arc-extinguishing chamber (332).

7. The circuit breaker according to claim 1, characterized in that: The accessory module (35) is a trip unit, which includes a thermomagnetic trip assembly (351) and an adjustable trip assembly (352). The thermomagnetic trip assembly (351) is fixedly connected to the connecting plate (34) on the moving contact (322), and the adjustable trip assembly (352) is fixed on the thermomagnetic trip assembly (351) and cooperates with the operating mechanism (2).

8. The circuit breaker according to claim 1, characterized in that: The stationary contact assembly (323) includes a stationary contact plate (3230) and a stationary arc-drawing angle (334). One end of the stationary contact plate (3230) is connected to one end of the stationary arc-drawing angle (334). The stationary contact plate (3230) is disposed at the junction of two arc-extinguishing cavities. The stationary contact plate (3230) and the moving contact assembly correspond to the first arc-extinguishing cavity (331). The other end of the stationary arc-drawing angle (334) extends along the first direction to the second arc-extinguishing cavity (332).

9. The circuit breaker according to claim 8, characterized in that: One end of the stationary contact plate (3230) is provided with a contact portion (3231), which is connected to the stationary arc-drawing angle (334) and cooperates with the moving contact assembly. The other end of the stationary contact plate (3230) is provided with a wiring portion (3232). The stationary contact plate (3230) connected between the wiring portion (3232) and the contact portion (3231) forms a mating area (3238). The stationary arc-drawing angle (334) passes through the mating area (3238) and connects with the contact portion (3231). The mating area (3238) cooperates with the first arc-extinguishing cavity (331) to ignite an arc.

10. The circuit breaker according to claim 9, characterized in that: A stationary contact plate (3230) connecting the contact portion (3231) and the wiring portion (3232) is provided along the outer side of the first arc extinguishing cavity (331), and a U-shaped groove forming a mating area (3238) is formed by the middle of the contact portion (3231), the wiring portion (3232) and the stationary contact plate (3230).

11. The circuit breaker according to claim 10, characterized in that: An arc-blocking plate (337) is provided between the static contact plate (3230) and the outer side of the first arc-extinguishing cavity (331).

12. The circuit breaker according to claim 9, characterized in that: A stationary contact plate (3230) connecting the contact part (3231) and the wiring part (3232) is disposed through the first arc extinguishing cavity (331). The stationary contact plate (3230) located in the first arc extinguishing cavity (331) has a through hole as a mating area (3238).

13. The circuit breaker according to claim 12, characterized in that: The first arc-extinguishing cavity (331) is provided with a first arc inlet (3301), the opening and closing trajectory of the moving contact assembly corresponds to the first arc inlet (3301), and the mating area (3238) forms a communication port between the first arc-extinguishing cavity (331) and the second arc-extinguishing cavity (332). The inner diameter of the communication port is smaller than the inner diameter of the first arc inlet (3301).

14. The circuit breaker according to claim 12, characterized in that: An arc-inducing plate (335) is also provided in the arc-extinguishing chamber (33). In the first direction, the arc-inducing plate (335) and the stationary arc-inducing angle (334) are spaced apart and opposite each other in the mating area (3238), so that an airflow channel (3239) is formed between the arc-inducing plate (335) and the stationary arc-inducing part (3341) of the stationary arc-inducing angle (334). One end of the arc-inducing plate (335) is located in the first arc-extinguishing cavity (331) and is connected to the stationary contact plate (3230) near the wiring part (3232). The other end of the arc-inducing plate (335) extends through the mating area (3238) into the second arc-extinguishing cavity (332).

15. The circuit breaker according to claim 1, characterized in that: The first arc-extinguishing cavity (331) is provided with at least one grid plate group, and the second arc-extinguishing cavity (332) is provided with at least one grid plate group. An arc-inducing plate (335) and / or a connecting grid plate group (3363) are provided between the grid plate groups of the first arc-extinguishing cavity (331) and the second arc-extinguishing cavity (332).

16. The circuit breaker according to claim 1, characterized in that: The arc-extinguishing chamber (33) includes a pair of spaced-apart side plates (3303), the gap between the pair of side plates (3303) forms an arc-extinguishing cavity, and at least a pair of spaced-apart gas-generating elements (3304) are provided in the gap between the pair of side plates (3303). The arc-extinguishing cavity is divided into a first arc-extinguishing cavity (331) and a second arc-extinguishing cavity (332). Alternatively, the arc-extinguishing chamber (33) includes two pairs of spaced-apart side plates (3303), the gap between each pair of side plates (3303) forms a first arc-extinguishing cavity (331) or a second arc-extinguishing cavity (332), and a pair of spaced-apart gas-generating elements (3304) are provided between each pair of side plates (3303). The first arc-extinguishing cavity (331) is provided with a first grid plate group (3361), and the second arc-extinguishing cavity (332) is provided with a second grid plate group (3362). The first grid plate group (3361) is connected to the side plate (3303) and the gas generating component (3304) of the first arc-extinguishing cavity (331), and the second grid plate group (3362) is connected to the side plate (3303) and the gas generating component (3304) of the second arc-extinguishing cavity (332).

17. The circuit breaker according to claim 1, characterized in that: The first arc-extinguishing cavity (331) and the second arc-extinguishing cavity (332) are perpendicular to each other.

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