Arc extinguishing system and circuit breaker

Abstract

The arc extinguishing system comprises an arc extinguishing chamber matched with a contact system, the arc extinguishing chamber comprises two arc extinguishing cavities which are communicated with each other, each arc extinguishing cavity is internally provided with at least one grid plate group, the contact system comprises a moving contact assembly and a static contact assembly which are matched with each other, the two arc extinguishing cavities are arranged at an included angle, and the two arc extinguishing cavities are arranged at the included angle. The static contact assembly is arranged at the joint of the two arc extinguishing cavities, the static contact assembly comprises a static arc striking angle, the opening and closing track of the moving contact assembly and one end of the static arc striking angle correspond to an arc inlet of one arc extinguishing cavity, and the other end of the static arc striking angle extends to the other arc extinguishing cavity. And the grid plate groups in the two arc extinguishing cavities are joined at the joint of the two arc extinguishing cavities. According to the utility model, the two arc extinguishing cavities are arranged at the included angle, so that the arc extinguishing grid sheets are additionally arranged in the arc extinguishing chamber in different directions, the breaking performance of high voltage and large current can be considered, and when the arc extinguishing chamber is arranged in the circuit breaker, the arc extinguishing chamber can be enlarged as much as possible in a limited space.

Description

Technical Field

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

[0002] A molded case circuit breaker is a low-voltage circuit protection device with functions such as overload, short circuit and undervoltage protection. 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 method of increasing the arc voltage is usually adopted, based on the theoretical formula U of the static volt-ampere characteristic of DC arc. h As shown by nU0+EL, increasing the number of arc-extinguishing grids is the most effective way to improve performance. However, in traditional arc-extinguishing chambers, the arc-extinguishing grids are arranged along the height. Due to space constraints, increasing the number of grids can compromise their thickness and spacing, resulting in unsatisfactory performance when breaking large currents. In some products, the arc-extinguishing grids are arranged along the length of the circuit breaker. While this can increase the number of grids to some extent, the surface area of ​​the grids and the volume of the arc-extinguishing chamber are relatively small, making it impossible to achieve satisfactory breaking performance for high voltage and high current. Summary of the Invention

[0004] The purpose of this invention is to overcome at least one defect of the prior art and to provide an arc extinguishing system and a circuit breaker.

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

[0006] This utility model provides an arc extinguishing system, including an arc extinguishing chamber that cooperates with a contact system. The arc extinguishing chamber includes two interconnected arc cavities, each of which contains at least one set of grid plates. The contact system includes a moving contact assembly and a stationary contact assembly that cooperate with each other. The two arc extinguishing cavities are arranged at an angle, and the stationary contact assembly is located at the junction of the two arc extinguishing cavities. The stationary contact assembly includes a stationary arc-leading angle. The opening and closing trajectory of the moving contact assembly and one end of the stationary arc-leading angle correspond to the arc inlet of one of the arc extinguishing cavities. The other end of the stationary arc-leading angle extends to the other arc extinguishing cavity. The grid plates in the two arc extinguishing cavities are connected at the junction of the two arc extinguishing cavities.

[0007] Preferably, the inner diameter of the arc inlet corresponding to the opening and closing trajectory of the moving contact assembly is greater than the inner diameter of the connecting port at the junction of the two arc extinguishing cavities.

[0008] Preferably, the stationary contact assembly further includes a stationary contact plate, which corresponds to the same arc-extinguishing cavity as the moving contact assembly. The stationary contact plate is provided with a contact portion and a wiring portion that are spaced apart from each other. The contact portion is connected to one end of the stationary arc-drawing angle and cooperates with the moving contact assembly. The wiring portion is located on the side of the arc-extinguishing cavity opposite to the moving contact assembly.

[0009] Preferably, the contact portion and the wiring portion are respectively disposed at both ends of the stationary contact plate, and a mating area is formed by the stationary contact plate connected between the wiring portion and the contact portion. One end of the stationary arc-drawing angle is provided with a stationary arc-drawing portion, which passes through the mating area and connects to the contact portion. The mating area cooperates with one of the arc-extinguishing cavities to draw an arc.

[0010] Preferably, the stationary contact plate connected between the contact portion and the wiring portion is disposed along the outer side of one of the arc-extinguishing cavities, and a U-shaped groove is formed by the contact portion, the wiring portion and the middle of the stationary contact plate as a mating area.

[0011] Preferably, a stationary contact plate connecting the contact portion and the wiring portion is disposed through one of the arc-extinguishing chambers, and the stationary contact plate located in the arc-extinguishing chamber has a through hole as a mating area.

[0012] Preferably, the mating area is further provided with an arc-inducing plate, which forms an airflow channel with the stationary arc-inducing part at intervals. The stationary arc-inducing part is provided with a protruding arc-inducing protrusion, which makes the inner diameter of the inlet of the airflow channel smaller than the inner diameter of the outlet of the airflow channel.

[0013] Preferably, the other end of the stationary arc angle extends in a direction away from the stationary contact plate, such that the other end of the stationary arc angle exceeds the tail end of the grid plate group corresponding to the stationary arc angle, or the other end of the stationary arc angle is flush with the tail end of the grid plate group corresponding to the stationary arc angle.

[0014] Preferably, another arc-extinguishing cavity is provided with a positioning rib, and the middle part of the static arc-drawing angle is located on the positioning rib.

[0015] Preferably, the arc-extinguishing chamber further includes a moving arc-starting angle, which is spaced apart from the stationary contact plate and corresponds to the arc inlet of the same arc-extinguishing chamber, and the moving arc-starting angle is adjacent to the moving contact assembly at the opening position.

[0016] Preferably, an arc-initiating plate and / or a connecting plate group are provided between the two arc-extinguishing chambers.

[0017] Preferably, the arc-extinguishing chamber includes a pair of side plates, each pair of side plates being spaced apart to form an arc-extinguishing cavity, and at least one pair of spaced-apart gas-generating elements between each pair of side plates. The grid plate group includes a plurality of spaced-apart arc-extinguishing grid plates, with the two sides of each arc-extinguishing grid plate connected to the side plate respectively, and an arc-extinguishing notch opened at one end of each arc-extinguishing grid plate, so that the legs located on both sides of the arc-extinguishing notch are wrapped by the gas-generating elements.

[0018] Preferably, the gas generating component is provided with multiple baffles, each baffle being separated between the legs on the same side of two adjacent arc-extinguishing grid plates, and the width of each baffle is less than the width of each leg, so that a gap as a slit is left between each baffle and the side plate, the slit corresponding to the area of ​​the leg near the side plate.

[0019] Preferably, the ribs of the two gas generating components are spaced apart to form a longitudinal slit, the longitudinal slit is located within the arc extinguishing notch, and the opening width of the longitudinal slit is smaller than the opening width of the arc extinguishing notch.

[0020] Preferably, the middle edge of the arc-extinguishing notch is provided with at least one notch, and when the central axis of the notch is deviated from the axis of the arc-extinguishing notch, the notches of adjacent arc-extinguishing grid plates are staggered.

[0021] Preferably, each arc-extinguishing chamber is formed by a pair of side plates, and a pair of gas-generating elements are provided between each pair of side plates, so that the two arc-extinguishing chambers form a separate structure; or, the two arc-extinguishing chambers share a pair of L-shaped side plates, and a pair of gas-generating elements are provided between the pair of L-shaped side plates, so that the two arc-extinguishing chambers form an integral structure.

[0022] Preferably, it also includes an arc-blocking plate, which is disposed outside the side plate.

[0023] Preferably, the two arc-extinguishing cavities are a first arc-extinguishing cavity and a second arc-extinguishing cavity, the grid plate group of the first arc-extinguishing cavity is a first grid plate group, and the grid plate group of the second arc-extinguishing cavity is a second grid plate group. The moving contact assembly and the stationary contact assembly are spaced apart on both sides of the first arc inlet of the first arc-extinguishing cavity. The first end of the second grid plate group and the tail end of the first grid plate group are connected at the junction of the two arc-extinguishing cavities. The first end of the first grid plate group is adjacent to the moving contact assembly at the opening position, and the tail end of the second grid plate group extends in a direction away from the first arc-extinguishing cavity.

[0024] Preferably, the first grid group includes a main grid group and a sub-grid group. The main grid group is spaced apart from the first arc inlet. The two ends of the main grid group are respectively connected to the second grid group and the sub-grid group at an angle. The sub-grid group is parallel to the second grid group.

[0025] Preferably, the stationary contact assembly has a stationary arc-drawing angle extending away from the first arc-extinguishing cavity, and the spacing between the second grid plate group and the stationary arc-drawing angle gradually decreases along the direction from the first end to the last end.

[0026] Preferably, the distance between the first arc-extinguishing cavity side opposite to the first arc-entry port and the first arc-entry port is less than the length between the first end and the last end of the second grid plate group.

[0027] This utility model also provides a circuit breaker, including a housing and a contact system disposed within the housing, wherein the housing is further provided with an arc extinguishing system as described above.

[0028] Furthermore, at least one first exhaust port and at least one second exhaust port are provided on opposite sides of the housing, and the lowest point of the first exhaust port is higher than the highest point of the second exhaust port, and the inner diameter of the first exhaust port is smaller than the inner diameter of the second exhaust port. The contact system and the arc-extinguishing chamber are located inside the housing between the first exhaust port and the second exhaust port, with one arc-extinguishing chamber located between the first exhaust port and the contact system, and the other arc-extinguishing chamber having one end away from the stationary contact assembly opposite to the second exhaust port.

[0029] Furthermore, an exhaust groove is provided between the side of the arc-extinguishing chamber facing away from the contact system and the outer casing, and one end of the exhaust groove is connected to the second exhaust port.

[0030] Furthermore, the inner diameter of the exhaust groove gradually increases at the end near the second exhaust port.

[0031] The arc-extinguishing system and circuit breaker of this invention have two arc-extinguishing chambers arranged at an angle, so that the grid plates arranged in the two arc-extinguishing chambers extend in two directions respectively. The static arc-inducing angle is coordinated to introduce the arc into the other arc-extinguishing chamber, thereby increasing the arc-extinguishing grid plates in different directions of the arc-extinguishing chamber. At the same time, it can also take into account the breaking performance of high voltage and high current. When the arc-extinguishing chamber is set in the circuit breaker, the arc-extinguishing chamber can be maximized within a limited space.

[0032] In addition, the inner diameter of the arc inlet is larger than the inner diameter of the connecting port at the junction of the two arc-extinguishing chambers, which creates a pressure difference in the arc-extinguishing chamber, which is conducive to gas flow and facilitates the flow of the electric arc in the two arc-extinguishing chambers.

[0033] In addition, the stationary contact plate and the moving contact assembly are matched with the same arc-extinguishing cavity, and the stationary arc-leading angle is matched with two arc-extinguishing cavities respectively, which is conducive to introducing the arc of the stationary contact into the two arc-extinguishing cavities.

[0034] In particular, the stationary contact plate can be set along the outside of the arc-extinguishing cavity or through an arc-extinguishing cavity. The stationary arc-initiating angle passes through the mating area and connects with the stationary contact plate, which not only facilitates the introduction of the electric arc into the arc-extinguishing cavity and improves the arc-initiating effect, but also facilitates the mating with the arc-extinguishing cavity.

[0035] Furthermore, the moving arc-starting angle and the stationary contact plate are located at the arc inlet of the same arc-extinguishing cavity, so that the moving arc-starting angle and the stationary arc-starting angle correspond to two arc-extinguishing cavities respectively. This allows the moving arc-starting angle to introduce the arc of the moving contact assembly into one arc-extinguishing cavity, and the stationary arc-starting angle to introduce the arc of the stationary contact plate into another arc-extinguishing cavity, thereby improving the arc-starting effect.

[0036] In particular, the other end of the static arc angle is flush with or exceeds the tail end of the grid group, which helps to improve the utilization rate of the grid group.

[0037] In addition, the ribs of the gas generating component and the side plate form a slit, which corresponds to a part of the support leg, increasing the path of the electric arc on the surface of the arc extinguishing grid, increasing the cooling rate of the electric arc and the contact area with the gas generating component, thereby increasing the arc pressure.

[0038] In addition, the ribs form longitudinal seams within the arc-extinguishing gap, which helps to compress the electric arc.

[0039] In addition, the two arc-extinguishing cavities can be an integrated structure or a separate structure, which has the advantages of convenient assembly and disassembly and a wide range of applications.

[0040] In addition, the width of the first arc-extinguishing cavity is smaller than the length of the second arc-extinguishing cavity. Increasing the length of the second arc-extinguishing cavity makes it easier to increase the number of arc-extinguishing grids in the second grid group, which helps to improve the arc-extinguishing capability.

[0041] In addition, the distance between the second grid group and the stationary arc angle gradually decreases, which is conducive to the erosion of the second grid group by the electric arc.

[0042] In addition, the circuit breaker casing is equipped with two exhaust ports, each of which is connected to an arc-extinguishing chamber to exhaust gas, which helps to quickly dissipate the exhaust gas. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the arc extinguishing system and the contact system in this utility model;

[0044] Figure 2 This is a schematic diagram of the arc extinguishing system and contact system in this utility model (another embodiment of the stationary contact assembly);

[0045] Figure 3 yes Figure 2 A schematic diagram of the electric arc when the moving contact assembly and the stationary contact assembly have just separated;

[0046] Figure 4 yes Figure 2 Arc diagram when the moving contact assembly is half open Figure 1 ;

[0047] Figure 5 yes Figure 2 Arc diagram when the moving contact assembly is half open Figure 2 ;

[0048] Figure 6 yes Figure 2 A schematic diagram of the electric arc when the moving contact assembly is just opened to its maximum;

[0049] Figure 7 yes Figure 2 A schematic diagram of the electric arc when the moving contact assembly is opened to its maximum;

[0050] Figure 8 This is an exploded view of the arc-extinguishing system in this utility model. Figure 1 ;

[0051] Figure 9 This is an exploded view of the arc-extinguishing system in this utility model. Figure 2 ;

[0052] Figure 10 This is a schematic diagram of the structure of the second arc-extinguishing cavity in this utility model. Figure 1 ;

[0053] Figure 11 This is a schematic diagram of the structure of the second arc-extinguishing cavity in this utility model. Figure 2 ;

[0054] Figure 12 This is the cross-section of the second arc-extinguishing cavity in this utility model. Figure 1 ;

[0055] Figure 13 This is the cross-section of the second arc-extinguishing cavity in this utility model. Figure 2 ; Figure 14 This is a side view of the second arc-extinguishing cavity in this utility model. Figure 1 ;

[0056] Figure 15 This is a side view of the second arc-extinguishing cavity in this utility model. Figure 2 ;

[0057] Figure 16 This is the cross-section of the arc-extinguishing cavity in this utility model. Figure 1 ;

[0058] Figure 17 This is the cross-section of the arc-extinguishing cavity in this utility model. Figure 2 ;

[0059] Figure 18 This is the cross-section of the arc-extinguishing cavity in this utility model. Figure 3 ;

[0060] Figure 19 This is a schematic diagram of the gas-generating component in this utility model. Figure 1 ;

[0061] Figure 20 This is a schematic diagram of the gas-generating component in this utility model. Figure 2 ;

[0062] Figure 21 This is a schematic diagram of the gas-generating component in this utility model. Figure 3 ;

[0063] Figure 22 This is the cross-section of the gas-producing component in this utility model. Figure 1 ;

[0064] Figure 23 This is the cross-section of the gas-producing component in this utility model. Figure 2 ;

[0065] Figure 24 This is a schematic diagram of the arc-extinguishing grid in this utility model. Figure 1 ;

[0066] Figure 25 This is a schematic diagram of the arc-extinguishing grid in this utility model. Figure 2 ;

[0067] Figure 26 This is a schematic diagram of the arc-extinguishing grid in this utility model. Figure 3 ;

[0068] Figure 27 This is a schematic diagram of the contact system in this utility model;

[0069] Figure 28 This is a schematic diagram of the static contact plate in this utility model;

[0070] Figure 29 This is a schematic diagram of the static arc angle in this utility model;

[0071] Figure 30 This is the front view of the static arc angle in this utility model;

[0072] Figure 31 This is a schematic diagram of the structure of the dynamic arc angle in this utility model;

[0073] Figure 32 This is a schematic diagram of the arc-guiding plate in this utility model;

[0074] Figure 33 This is a structural schematic diagram of the contact system in this utility model (another embodiment of the stationary contact assembly);

[0075] Figure 34 This is a schematic diagram of the structure of a stationary contact assembly according to another embodiment of the present invention;

[0076] Figure 35 This is a cross-sectional view of a stationary contact assembly according to another embodiment of the present invention;

[0077] Figure 36 This is a schematic diagram of the structure of a static contact plate according to another embodiment of this utility model;

[0078] Figure 37 This is a schematic diagram of the static arc angle of another embodiment of this utility model;

[0079] Figure 38 This is a schematic diagram of the structure of the second arc-blocking cover in another embodiment of this utility model;

[0080] Figure label:

[0081] 3111-First exhaust port, 3112-Second exhaust port, 321-Rotating shaft, 322-Moving contact, 323-Stationary contact assembly, 3230-Stationary contact plate, 3231-Contact part, 32311-Connecting section, 3232-Wiring part, 3233-Stationary contact point, 3234-Inclined section, 3235-Horizontal section, 3236-First transition section, 3237-Second transition section, 3238-Matching Combined area, 3239-Airflow channel, 32391-Inlet, 32392-Outlet, 3241-First arc-blocking cover, 3242-Second arc-blocking cover, 32420-Main body, 32421-Extension, 32422-Baffle, 32423-Arc-initiating support leg, 32424-Support, 32425-Groove, 33-Arc-extinguishing chamber, 3302-Arc-running track, 3303-Side plate, 3304- Gas generating component, 33041-rib, 3305-slit, 3306-longitudinal slit, 331-first arc-extinguishing cavity, 332-second arc-extinguishing cavity, 333-moving arc-starting angle, 3331-moving arc-starting part, 3332-moving sharp angle part, 334-static arc-starting angle, 3341-static arc-starting part, 33410-arc-starting protrusion, 33411-first segment, 33412-second segment, 33413-third segment, 3 342-Stationary 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, 338-De-detaching component, 339-Magnetic yoke, 3391-Magnetic enhancement component, 34-Connecting plate. Detailed Implementation

[0082] The specific implementation of the arc-extinguishing system and circuit breaker of this utility model is further described below with reference to the accompanying drawings. The arc-extinguishing system and circuit breaker of this utility model are not limited to the descriptions in the following embodiments.

[0083] like Figure 1 , 2As shown, the circuit breaker includes a housing, within which an operating mechanism and at least one conductive unit are disposed. Each conductive unit includes a pair of spaced-apart terminals. Between the pair of terminals are a contact system and an arc-extinguishing system. The contact system includes a cooperating moving contact assembly and a stationary contact assembly. The arc-extinguishing system includes an arc-extinguishing chamber 33. Typically, the arc-extinguishing chamber 33 has at least one arc-extinguishing cavity. The side of the arc-extinguishing cavity has an opening that can serve as an arc inlet for cooperation with the contact system. That is, the moving contact assembly and the stationary contact assembly are spaced apart and opposite each other at the arc inlet, and the opening and closing trajectory of the moving contact assembly is opposite to the arc inlet. The moving contact assembly typically includes a rotatably mounted shaft 321. A moving contact 322 is rotatably connected to the rotating shaft 321. The rotating shaft 321 is driven by the operating mechanism to cause the moving contact 322 to separate or contact with the stationary contact assembly, so as to realize the opening and closing swing. The arc inlet is located on the side of the arc extinguishing chamber, which facilitates providing a larger opening distance for the contact system. At least one grid plate group is provided in the arc extinguishing chamber. Each grid plate group includes multiple arc extinguishing grid plates 3360 arranged at intervals. When there are two arc extinguishing chambers, the interiors of the two arc extinguishing chambers are kept in communication with each other. The grid plate groups in the two arc extinguishing chambers are connected. The arc generated by the breaking of the contact system is introduced into the arc extinguishing chamber by the arc extinguishing chamber 33 to extinguish it. The arc extinguishing chamber 33 is connected to the exhaust port opened on the outer shell, thereby discharging the exhaust gas generated by the arc extinguishing.

[0084] The improvement of this application is that the two arc-extinguishing cavities are arranged at an angle, the stationary contact assembly is disposed at the junction of the two arc-extinguishing cavities, the stationary contact assembly includes a stationary arc-leading angle 334, the opening and closing trajectory of the moving contact assembly and one end of the stationary arc-leading angle 334 correspond to the arc inlet of one of the arc-extinguishing cavities, the other end of the stationary arc-leading angle 334 extends to the other arc-extinguishing cavity, and the grid plate groups in the two arc-extinguishing cavities are connected at the junction of the two arc-extinguishing cavities.

[0085] Thus, the two arc-extinguishing chambers of the arc-extinguishing chamber 33 are arranged at an angle, so that the grid plates arranged in the two arc-extinguishing chambers extend in two directions respectively. The static arc-leading angle 334 cooperates to introduce the arc into the other arc-extinguishing chamber, thereby increasing the arc-extinguishing grid plates 3360 in different directions in the arc-extinguishing chamber 33. At the same time, it can also take into account the breaking performance of high voltage and high current. When the arc-extinguishing chamber 33 is installed in the circuit breaker, the arc-extinguishing chamber 33 can be maximized within a limited space.

[0086] Specifically, the two arc-extinguishing cavities are the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332. The grid plate group of the first arc-extinguishing cavity 331 is the first grid plate group 3361, and the grid plate group of the second arc-extinguishing cavity 332 is the second grid plate group 3362. The first end of the second grid plate group 3362 and the tail end of the first grid plate group 3361 are connected at the junction of the two arc-extinguishing cavities. Both the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 have an open structure on all four sides. That is, the four sides of the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 connected in sequence are completely open. The opening along the length direction in the first arc-extinguishing cavity 331 is the first arc inlet of the first arc-extinguishing cavity 331. The first arc inlet is used to cooperate with the contact system. That is, the opening and closing movement trajectory of the moving contact 322 corresponds to the first arc inlet.

[0087] Furthermore, the inner diameter of the arc inlet corresponding to the opening and closing trajectory of the moving contact assembly is greater than the inner diameter of the connecting port at the junction of the two arc-extinguishing chambers. That is, the inner diameter of the first arc inlet of the first arc-extinguishing chamber 331 is greater than the inner diameter of the connecting port of the two arc-extinguishing chambers, thereby creating a pressure difference in the arc-extinguishing chamber 33, which is conducive to gas flow and facilitates the flow of the electric arc in the two arc-extinguishing chambers.

[0088] Preferably, the stationary contact assembly disposed at the junction of the two arc-extinguishing cavities 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 and the moving contact assembly cooperate with the same arc-extinguishing cavity. The stationary arc-drawing angle 334 cooperates with the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 respectively. The other end of the stationary arc-drawing angle 334 extends into the second arc-extinguishing cavity 332.

[0089] Furthermore, the arc-extinguishing chamber 33 is also provided with a moving arc-starting angle 333 that cooperates with the moving contact 322. The moving arc-starting angle 333 is spaced apart from the stationary contact plate 3230 and corresponds to the arc inlet of the same arc-extinguishing chamber. That is, the moving arc-starting angle 333 is set in the first arc-extinguishing chamber 331, and the moving arc-starting angle 333 is adjacent to the moving contact 322 in the open position. The moving arc-starting angle 333 and the stationary arc-starting angle 334 are spaced apart and opposite to each other on opposite sides of the first arc inlet. One end of the arc-starting angle 333 extends into the first arc-extinguishing cavity 331 and connects with the grid plate group of the first arc-extinguishing cavity 331. The stationary arc-starting angle 334 extends outside the opening of the second arc-extinguishing cavity 332 in a direction away from the first arc-extinguishing cavity 331. Thus, the moving arc-starting angle 333 introduces the arc of the moving contact assembly into the first arc-extinguishing cavity 331, and the stationary arc-starting angle 334 introduces the arc of the stationary contact plate 3230 into the second arc-extinguishing cavity 332, thereby improving the arc-starting efficiency.

[0090] Specifically, the stationary contact plate 3230 includes a contact portion 3231 and a wiring portion 3232 spaced apart. The contact portion 3231 and the moving contact 322 are spaced apart and opposite each other at the arc inlet of the same arc-extinguishing chamber (the first arc inlet of the first arc-extinguishing chamber 331). A mating area 3238 is provided between the contact portion 3231 and the wiring portion 3232. One end of the stationary arc-starting angle 334 passes through the mating area 3238 and connects to the contact portion 3231. The mating area 3238 cooperates with one of the arc-extinguishing chambers to ignite an arc. The wiring portion 3232 is located outside the arc-extinguishing chamber 33 and is used to connect to an adjacent wiring terminal.

[0091] The stationary contact plate 3230 is typically a plate-shaped structure. The contact portion 3231 and the wiring portion 3232 are respectively disposed at both ends of the stationary contact plate 3230. The stationary contact plate 3230 connecting the contact portion 3231 and the wiring portion 3232 is disposed along the outer side of one of the arc-extinguishing cavities, for example, along the outer side of the first arc-extinguishing cavity 331. In this case, a U-shaped groove forming a mating area 3238 is formed by the contact portion 3231, the wiring portion 3232 and the middle part of the stationary contact plate 3230. Alternatively, the stationary contact plate 3230 connecting the contact portion 3231 and the wiring portion 3232 passes through one of the arc-extinguishing cavities, and the stationary contact plate 3230 located in the arc-extinguishing cavity has a through hole forming a mating area 3238.

[0092] The other end of the stationary arc angle 334 extends in a direction away from the stationary contact plate 3230, so that the other end of the stationary arc angle 334 exceeds the tail end of the grid plate group corresponding to the stationary arc foot 334, or the other end of the stationary arc angle 334 is flush with the tail end of the grid plate group corresponding to the stationary arc angle 334. That is, the other end of the stationary arc angle 334 exceeds the tail end of the second grid plate group 3362 in the second arc extinguishing cavity 332 or is flush with the tail end of the second grid plate group 3362.

[0093] In addition, the opening along the length of the second arc-extinguishing cavity 332 is the second arc inlet. The stationary arc-drawing angle 334 is located outside the second arc inlet and extends along the second arc inlet, so that the second arc inlet is covered by the stationary arc-drawing angle 334. Preferably, the other end of the stationary arc-drawing angle 334 can be bent and extended into the second arc-extinguishing cavity 332 and is spaced opposite to the tail end of the second grid plate group 3362, thereby ensuring that the electric arc is completely introduced into the second grid plate group 3362 and improving the utilization rate of the second grid plate group 3362.

[0094] like Figure 8-18As shown, the arc-extinguishing chamber 33 includes a pair of side plates 3303, each pair of side plates 3303 being spaced apart to form an arc-extinguishing cavity. At least one pair of spaced-apart gas-generating elements 3304 are provided between each pair of side plates 3303, with the gas-generating elements 3304 corresponding to the two sides of the first arc inlet. The gap between each pair of gas-generating elements 3304 forms an arc-running track 3302. The grid plate group disposed in the arc-extinguishing cavity includes a plurality of spaced-apart arc-extinguishing grid plates 3360. The two sides of each arc-extinguishing grid plate 3360 are connected to the side plates 3303 respectively. One end of each arc-extinguishing grid plate 3360 is provided with an arc-extinguishing notch 33601. The legs 33602 located on both sides of the arc-extinguishing notch 33601 are wrapped by the gas-generating elements 3304.

[0095] Preferred, such as Figure 15-21 As shown, the gas generating component 3304 is provided with multiple baffles 33041. Each baffle 33041 is separated between the legs 33602 on the same side of two adjacent arc-extinguishing grid plates 3360. Alternatively, it can be understood that a slot is formed between two adjacent baffles 33041 to accommodate the legs 33602. Preferably, a wrapping slot 33044 is provided near the end of the leg 33602, so that the end of the leg 33602 is wrapped in the wrapping slot 33044. The width of each baffle 33041 is smaller than the width of each leg 33602, leaving a slit between each baffle 33041 and the side plate 3303. The gap 3305, where the slit 3305 corresponds to the area of ​​the support leg 33602 near the side plate 3303, can increase the path of the arc on the surface of the arc extinguishing grid 3360, increase the cooling rate of the arc and the contact area with the gas generating element 3304, thereby increasing the arc pressure; at the same time, the partition 33041 of the two gas generating elements 3304 are spaced apart to form a longitudinal slit 3306, which corresponds to the arc extinguishing notch 33601, and the opening of the longitudinal slit 3306 is smaller than the opening of the arc extinguishing notch 33601. One end of the longitudinal slit 3306 is connected to the arc running track 3302, forming a longitudinal slit 3306 to facilitate the compression of the arc.

[0096] Furthermore, the two arc-extinguishing chambers of arc-extinguishing chamber 33 can be a single integrated structure (see [reference]). Figure 8 In this case, the two arc-extinguishing chambers share a pair of side plates 3303 and a pair of gas-generating elements 3304, or the two arc-extinguishing chambers share a pair of side plates 3303, and two pairs of gas-generating elements 3304 are arranged between the pair of side plates 3303, with each pair of gas-generating elements 3304 corresponding to one arc-extinguishing chamber. Of course, if... Figure 9 As shown, the two arc-extinguishing chambers are formed by a pair of side plates 3303 and a pair of gas-generating components 3304, respectively. Figure 10 , 12 The diagram in the middle shows the second arc-extinguishing cavity 332 in the split structure, which can meet the needs of different products and has the advantages of convenient disassembly and assembly and wide applicability.

[0097] Combination Figure 1-26 A specific embodiment of an arc extinguishing system is provided. The arc extinguishing system includes an arc extinguishing chamber 33. The arc extinguishing chamber 33 includes two arc extinguishing cavities connected at one end and arranged at an angle to each other. In this embodiment, the two arc extinguishing cavities are vertically connected. Of course, the angle between the two arc extinguishing cavities can also be other angles. For ease of description, the two arc extinguishing cavities are referred to as the first arc extinguishing cavity 331 and the second arc extinguishing cavity 332.

[0098] like Figure 1 As shown, the first arc-extinguishing cavity 331 is arranged along the second direction, that is... Figure 1 The second arc-extinguishing cavity 332 is positioned along the first direction, i.e., in the vertical direction. Figure 1 In 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. 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, of which some of the arc-extinguishing grid plates 3360 are arranged on the side opposite to the first arc inlet, and the other part is disposed in the first arc-extinguishing cavity 3361 on the side of the first arc inlet. In the diagram, multiple arc-extinguishing grid plates 3360, positioned at intervals and opposite to the first arc inlet, are arranged at intervals along a second direction. Multiple arc-extinguishing grid plates 3360 located on one side of the first arc inlet are arranged at intervals along a first direction. This can also be understood as the first grid plate group 3361 comprising a main grid plate group and a secondary grid plate group. The main grid plate group is positioned at intervals opposite to the first arc inlet 3301. One end of the main grid plate group serves as the tail end of the first grid plate group 3361 and is connected at an angle to the head end of the second grid plate group 3362. The other end is connected at an angle to one end of the secondary grid group. The secondary grid group and the second grid group 3362 are respectively connected at an angle to both ends of the main grid group, and the secondary grid group and the second grid group 3362 are parallel to each other. In this embodiment, the main grid group is perpendicular to the secondary grid group and the second grid group 3362, respectively, so that the arc-extinguishing cavity of the arc-extinguishing chamber is approximately U-shaped. The grid group disposed in the second arc-extinguishing cavity 332 is the second grid group 3362. The second grid group 3362 is disposed along the first direction. The first end of the grid plate group 3362 is connected to the tail end of the first grid plate group 3362, and the first end of the second grid plate group 3362 and the first end of the first grid plate group 3361 are respectively located on opposite sides of the first arc inlet. That is, the first ends of the first grid plate group 3361 and the second grid plate group 3362 are spaced apart and opposite each other in the second direction, and the tail end of the second grid plate group 3362 extends along the first direction. In other words, the second grid plate group 3362 includes a plurality of arc-extinguishing grid plates 3360 spaced apart in the first direction.

[0099] like Figure 10-12As shown, 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 1 The direction perpendicular to the paper surface, Figure 10 In the left-right direction, that is, the first direction, the second direction, and the third direction are perpendicular to each other, the gas generating components 3304 are arranged in pairs between a pair of side plates 3303, and each pair of gas generating components 3304 forms an arc running track 3302 that communicates with the first arc inlet; the two sides of each arc extinguishing grid plate 3360 are connected to the side plate 3303 respectively. For example, the edge of the arc extinguishing grid plate 3360 is provided with a protrusion, the side plate 3303 is provided with a slot that engages with the protrusion, and one end of each arc extinguishing grid plate 3360 is provided with an arc extinguishing function. 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 has an insertion groove for the support legs 33602, and the insertion groove has a wrapping slot 33044 that wraps the end of the support leg 33602. See details [link to documentation]. Figure 22 , 23 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. One of the openings can serve as the first arc inlet of the first arc-extinguishing chamber 331, and the opening on one side of the second arc-extinguishing chamber 332 serves as the second arc inlet. 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. See [link to documentation] for details. Figure 25 .like Figure 14-23 As shown, each gas generating component 3304 is also provided with multiple baffles 33041. Each baffle 33041 is separated between the legs 33602 on the same side of two adjacent arc-extinguishing grid plates 3360. The width of each baffle 33041 is smaller than the width of each leg 33602, so that a gap as a slit 3305 is left between each baffle 33041 and the side plate 3303. The slit 3305 corresponds to the area of ​​the leg 33602 near the side plate 3303, thereby increasing the path of the arc on the surface of the arc-extinguishing grid plate 3360, which is beneficial for compressing the arc column, increasing the arc movement trajectory and accelerating cooling.

[0100] Furthermore, such as Figure 14-22As 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.

[0101] Preferably, the edge of the rib 33041 has a certain curvature or multiple straight segments connected at an angle, which is beneficial for 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. Furthermore, the arc-extinguishing notch 33601 has at least one notch groove 33603 on its central edge, such as... Figure 14-18 As shown, when there is only one notch 33603, it 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, thus causing the notches 33603 of two adjacent arc-extinguishing grid plates 3360 to be misaligned. Of course, there can be multiple notches 33603, thus forming a crown-shaped structure, which makes the electric field strength at the sharp corners stronger, which is conducive to guiding the arc into the grid plate group; as Figure 14 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.

[0102] It should be noted that, as Figure 25 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.

[0103] The distance between the first arc-extinguishing cavity 331 and the first arc-extinguishing cavity 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 to improve the arc-extinguishing capability.

[0104] like Figure 8 As shown, the first arc-extinguishing chamber 331 and the second arc-extinguishing chamber 332 share a pair of L-shaped side plates 3303. A pair of gas-generating elements 3304 are arranged between the pair of L-shaped side plates 3303. The gas-generating elements 3304 in the figure are also L-shaped, 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 8-20 As shown, each arc-extinguishing chamber is formed by a pair of side plates 3303. Each side plate 3303 is rectangular. A pair of gas-generating elements 3304 are provided 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 arc-extinguishing chamber 33.

[0105] 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 1 In the first grid plate group 3361, the arc-extinguishing grid plate 3360 opposite to the first arc inlet is set at a slight angle to the first direction. The arc-extinguishing grid plate 3360 located on one side of the first arc inlet in the first grid plate group 3361 is set at an angle to the second direction. The arc-extinguishing grid plate 3360 of the second grid plate group 3362 is set at an angle to the second direction.

[0106] The grid assembly in the first arc-extinguishing cavity 331 and the second arc-extinguishing cavity 332 is connected in series, which facilitates the introduction of the electric arc in the first arc-extinguishing cavity 331 into the second arc-extinguishing cavity 332, such as Figure 1 , 2As shown, an arc-inducing 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-inducing plate 335 is located inside the first arc-extinguishing cavity 331, and the first end of the arc-inducing plate 335 is spaced apart from an arc-extinguishing grid 3360 (the 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-inducing plate 335 is located inside the second arc-extinguishing cavity 332, and the other end of the arc-inducing plate 335 is spaced apart from an arc-extinguishing grid 3360 (the arc-extinguishing grid 3360 at the head end of the second grid group 3362) near the first arc-extinguishing cavity 331. It can also be considered that the two ends of the arc-inducing plate 335 are respectively the arc-extinguishing grid 3360 located at the end position of the first grid group 3361 and the second grid group 3362.

[0107] Or, such as Figure 8 As shown, a connecting grid group 3363 is provided at the junction of the first arc extinguishing cavity 331 and the second arc extinguishing cavity 332. The connecting grid group 3363 includes a plurality of connecting grids arranged at intervals. Preferably, the connecting grid group 3363 is arranged in a fan-shaped structure, thereby connecting the first grid group 3361 and the second grid group 3362.

[0108] Preferred, such as Figure 21 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 separates from the stationary contact to continue flowing from the arc inlet into the arc-extinguishing chamber under the drive of the Lorentz force. Of course, if the magnetizing component 3391 is not provided, the mounting groove 33042 is not required. Additionally, the second arc-extinguishing chamber 332 is provided with positioning ribs 33043. Figure 18 , 19 In -22, the positioning ribs 33043 are located on one side opposite to the two pairs of gas generating components 3304.

[0109] In addition, the arc-extinguishing chamber 33 also includes an arc-isolating plate (not shown). Preferably, the arc-isolating plates are arranged in pairs outside the side plate 3303. The arc-isolating plates 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 plate is located between the middle of the stationary contact plate 3230 and the side wall to achieve the isolation function.

[0110] The arc-extinguishing chamber 33 also includes a dynamic arc-starting angle 333 and a static arc-starting angle 334, such as Figure 1 , 2As shown in Figures 27-31, one end of the dynamic arc-starting angle 333 and the static arc-starting angle 334 are spaced apart and positioned on opposite sides of the first arc-entry port. One end of the static arc-starting angle 334 is located at the junction of the two arc-extinguishing cavities, and the other end of the dynamic arc-starting 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-starting angle 333 is spaced apart and positioned opposite to an arc-extinguishing grid plate 3360 adjacent to the first arc-entry port of the first grid plate group 3361. The other end of the static arc-starting angle 334 is positioned along the second arc-entry port of the second arc-extinguishing cavity 332. Extending outwards from the first arc-extinguishing cavity 331, the middle of the stationary arc-inducing angle 334 is positioned on the positioning rib 33043, serving to limit the stationary arc-inducing angle 334. The maximum distance from the stationary arc-inducing angle 334 to the grid assembly inside the second arc-extinguishing cavity 332 is less than the distance from the second end of the arc-inducing plate 335 to the stationary arc-inducing angle 334. This ensures smooth airflow while preventing the electrical clearance between the stationary arc-inducing angle 334 and the second end of the arc-inducing plate 335 from being too small, which could cause the grid assembly inside the second arc-extinguishing cavity 332 to malfunction. Figure 1 In the middle, the distance from the middle of the static arc-leading angle 334 to the middle of the second grid plate group 3362 is the largest, and this distance is denoted as D2. The distance between the second end of the arc-leading plate 335 and the first end of the static arc-leading angle 334 is denoted as D1, where D1 > D2.

[0111] 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.

[0112] Combination Figure 1 , 2 -7.9-21 provides a specific structure for the static arc-inducing angle 334 applied in this embodiment. The static arc-inducing angle 334 includes a plate-shaped body with different widths at both ends, and the width of the plate-shaped body gradually changes. The plate-shaped body is disposed along the outer side of the second arc-extinguishing cavity 332. In the figure, the plate-shaped body can cover the second arc inlet of the second arc-extinguishing cavity 332. One end of the wider plate-shaped body is folded back to form a static arc-inducing portion 3341. The plane where the static arc-inducing portion 3341 is located is inclined opposite to the middle of the plate-shaped body. At the same time, at least a part of the static arc-inducing angle 334 is inclined opposite to the static contact plate 3230 to facilitate arc induction. One end of the narrower plate-shaped body serves as the static sharp corner portion 3342, and the width of the static sharp corner portion 3342 is the smallest. Of course, the static arc-inducing angle 334 can also be a plate structure with a uniform width, only the width of the static sharp corner portion 3342 needs to be the smallest.

[0113] Furthermore, such as Figure 29 , 30 As shown, a protrusion 3344 is provided on the side of the stationary sharp corner 3342 facing the second arc-extinguishing cavity 332. The sharp corner shape of the stationary sharp corner 3342, together with the protrusion 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. Alternatively, the stationary sharp corner 3342 bends and extends into the second arc-extinguishing cavity 332 and is spaced apart from the end of the grid plate group in the second arc-extinguishing cavity 332 that is away from the first arc-extinguishing cavity 331. This is conducive to introducing the electric arc into the second arc-extinguishing cavity 332, and also improves the utilization rate of the arc-extinguishing grid plate 3360 in the second grid plate group 3362.

[0114] Preferred, such as Figure 29 , 30 As shown, the plate-shaped body connecting the stationary sharp corner portion 3342 and the stationary arc-drawing portion 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. Preferably, the stationary contact assembly in this embodiment is further connected to an arc-inducing plate 335. In the first direction, the stationary arc-inducing angle 334 and the arc-inducing plate 335 are spaced apart and opposite each other. The arc-inducing plate 335 has a plate-like structure, and the middle part of the arc-inducing plate 335 is bent to form an L-shape. One end of the arc-inducing plate 335 passes through the mating area 3329 and connects to the stationary contact plate 3230 near the wiring part 3232. The arc-inducing plate 335 and the stationary arc-inducing angle 334 are located on opposite sides of the mating area 3238. The other end of the arc-inducing plate 335 extends in a direction away from the stationary contact plate 3230, and the other end of the arc-inducing plate 335 and the stationary arc-inducing angle 334 are located on the same side of the stationary contact plate 3230. The arc-inducing plate 335 and the stationary arc-inducing angle 334 cooperate to induce an arc, which is beneficial to introduce the electric arc on the stationary contact assembly into the arc-extinguishing chamber. 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.

[0115] Combination Figure 1-7 A specific structure for the dynamic arc-drawing angle 333 applied in this embodiment is provided. The dynamic 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 overall 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. The other end of the arc-drawing angle body serves as the dynamic arc-drawing part 3331. The end of the dynamic arc-drawing part 3331 forms a dynamic tip 3332. The dynamic tip 3332 is folded back on one side of the first arc-entry port. The dynamic tip 3332 is spaced apart from the stationary arc-drawing part 3341 on both sides of the first arc-entry port. It should be noted that the widths of the dynamic arc-drawing part 3331 and the dynamic tip 3332 can be the same or different.

[0116] The circuit breaker includes a housing, within which an operating mechanism and at least one conductive unit are disposed. The conductive unit includes a pair of terminals, a contact system, and an arc-extinguishing chamber 33 as described in the above embodiment. The pair of terminals are spaced apart at opposite ends of the housing. The contact system is disposed at the first arc inlet of the arc-extinguishing chamber 33. The contact system includes a cooperating moving contact assembly and a stationary contact assembly. The moving contact assembly and the stationary contact assembly are spaced apart and opposite each other in a second direction. The stationary contact assembly is disposed at the junction of the two arc-extinguishing chambers and connected to a stationary arc-starting angle 334. The moving contact assembly is connected to an adjacent terminal via a connecting plate 34, and the stationary contact assembly is connected to another adjacent terminal. Figure 1 , 2 As shown, the moving contact assembly includes a rotating shaft 321 and a moving contact 322 connected to the rotating shaft 321. The rotating shaft 321 is linked to the operating mechanism, and the moving contact 322 is located on the side of the first arc inlet away from the second arc extinguishing cavity 332. The moving contact 322 swings in the second direction at the first arc inlet. 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. The stationary contact assembly includes a stationary contact plate 3230 and a stationary arc ignition angle 334. The end of the stationary contact plate 3230 with a stationary contact point is located on the side of the first arc inlet closer to the second arc extinguishing cavity 332. The moving contact 322 and the stationary contact plate 3230 are respectively engaged with the moving arc ignition angle 333 and the stationary arc ignition angle 334 of the first arc inlet.

[0117] Combination Figure 1 , 27 -30 provides a specific embodiment of a static touch plate 3230.

[0118] like Figure 1 , 27 As shown in Figure 28, the stationary contact assembly 323 includes a stationary contact plate 3230 and a stationary lead-out angle 334. The stationary contact plate 3230 is a straight plate shape arranged along a first direction, and the plane on which the stationary contact plate 3230 is located is parallel to the plane enclosed by the first direction and the second direction. 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, and 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 27 , 28 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.

[0119] The end of the inclined segment 3234 that is far from the horizontal segment 3235 deviates Figure 27 , 28 In the first direction, the inclined segment 3234, which 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 27 , 28 In the middle section, the second transition section 3237 and the inclined section 3234 are perpendicular to each other on the same plane, and the contact portion 3231 is formed by bending and extending the end of the second transition section 3237. Figure 27 , 28 In this embodiment, the plane where the contact portion 3231 is located is perpendicular to the plane where the second transition section 3237 is located, and 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 of the stationary contact plate 3230.

[0120] In addition, there is a gap between the contact part 3231 and the wiring part 3232. The middle part of the stationary contact plate 3230 connected between the contact part 3231 and the wiring part 3232 is arranged along the same side of the gap, so that the contact part 3231, the wiring part 3232 and the middle part of the stationary contact plate 3230 connected between the contact part 3231 and the wiring part 3232 form a mating area 3238. When the stationary contact assembly is installed in the circuit breaker, the mating area 3238 can be used to accommodate the arc extinguishing cavity. That is, the inclined end 3234 and the horizontal section 3235 of the stationary contact plate 3230 are attached to the outer side of the first arc extinguishing cavity 331. At this time, an arc-blocking plate needs to be installed between the first arc extinguishing cavity 331 and the stationary contact plate 3230.

[0121] Combination Figure 2-7 33-38 provide another specific structure for the stationary contact assembly used in this embodiment.

[0122] The stationary contact assembly 323 includes a stationary contact plate 3230 and a stationary arc angle 334, wherein the stationary contact plate 3230 is an edge... Figure 2-7 The plate is horizontally oriented and has a straight plate shape. The plane of the stationary contact plate 3230 is located through the first arc extinguishing cavity 331. A through hole is opened in the middle of the stationary contact plate 3230 as a mating area 3238. One end of the stationary contact plate 323 is folded back and extended to form a contact part 3231. The contact part 3231 is spaced apart from the plate surface of the stationary contact plate 3230, and at least a part of the contact part 3231 corresponds to the mating area 3239. A stationary contact point 3233 is provided on the side of the contact part 3230 that is away from the mating area 3238. The other end of the stationary contact plate 3230 is provided with a wiring hole as a wiring part 3232.

[0123] The stationary arc angle 334 is generally in the shape of a strip plate. The stationary arc angle 334 is arranged in a direction parallel to the stationary contact plate 3230. One end of the stationary arc angle 334 is folded back to form a stationary arc portion 3341. The stationary arc portion 3341 passes through the mating area 3238 and connects to the contact portion 3231. The other end of the stationary arc angle 334 extends in a direction away from the contact portion 3231. Thus, the stationary contact plate 3230 and the stationary arc angle 334 are arranged in an approximate first direction, so that the stationary contact assembly 323 is separated in the second direction between the second arc extinguishing cavity 332 and the operating mechanism (moving contact assembly).

[0124] Furthermore, such as Figure 32-38 As shown, 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. Figure 32 In this configuration, the arc-inducing plate 335 is generally L-shaped. One end of the arc-inducing plate 335 is connected to the area of ​​the stationary contact plate 3230 near the wiring portion 3232. The other end of the arc-inducing plate 335 extends away from the stationary contact plate 3230 after passing through the mating area 3238, so that the gap between the arc-inducing plate 335 and the stationary arc-inducing portion 3341 forms an airflow channel 3239 of a certain length. Preferably, the middle part of the stationary arc-inducing portion 3341 is bent at least once to form an arc-inducing protrusion 33410. The arc-inducing protrusion 33410 corresponds to the opening of the airflow channel 3239, and the arc-inducing 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 2 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.

[0125] like Figure 2 , 27 As shown in Figure -36, 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 36In 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.

[0126] like Figure 2 , 33 As shown in Figure -37, the static arc angle 334 is located on 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 34 and 37 In the figure, the width of the stationary sharp corner portion 3342 is the smallest, and its width is preferably gradually reduced 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 initiation portion 3341 is bent at least once to form the arc initiation protrusion 33410. In the figure, the middle part of the stationary arc initiation portion 3341 is bent once, so that the stationary arc initiation portion 3341 is hook-shaped as a whole. The stationary arc initiation 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. Furthermore, the end of the first segment 33411 connects with the edge of the stationary contact 3233, avoiding any gap between them. The third segment 33413 obliquely passes through the mating area 3238 and connects 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 3233. It should be noted that the second contact point can be connected to the stationary arc-initiating part 3341 at other locations on the stationary contact plate 3230.

[0127] 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.

[0128] like Figure 2-7 As shown in Figures 33-36, 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 35-37 In this configuration, the arc-initiating plate 335 is 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, forming an airflow channel 3239 of a certain length between the arc-initiating plate 335 and the stationary arc-initiating part 3341. The arc-initiating protrusion 33410 corresponds to the opening of the airflow channel 3239, narrowing the inlet 32391 of the airflow channel 3239, making the inner diameter of the inlet 32391 of the airflow channel 3239 smaller than the inner diameter of the outlet 32392 of the airflow channel 3239. Figure 35 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.

[0129] In addition, such as Figure 2-7 As shown in Figure 35, 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 installed 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.

[0130] like Figure 1 , 8 As shown in -14 and 15, 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.

[0131] In this embodiment, as Figure 34 , 35 As shown in Figure 38, 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 part 3232, that is, the first arc-blocking cover 3241 wraps around the outside of the connecting section 32311; as shown in Figure 38. Figure 38As shown, 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 part 3232. The baffle 32422 can cooperate with the arc-extinguishing chamber 33 in the circuit breaker to prevent the electric arc from affecting the wiring part 3232. The second arc-blocking cover 3242 covers the plate surface of the stationary contact plate 3230 located between the wiring part 3232 and the contact part 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. In the figure, the second arc-blocking cover 3242 covers the side of the stationary contact plate 3230 facing the first grid plate group 332. The second arc-blocking cover 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.

[0132] Preferred, such as Figure 38 As 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.

[0133] Furthermore, such as Figure 35 , 38As shown, the arc-starting structure also includes a support portion 32424, which is formed by extending from the edge of the second arc-blocking cover 3242. Each support portion 32424 and an adjacent arc-starting 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-blocking cover 3242 can be mounted on the stationary contact plate 3230.

[0134] In this embodiment, as Figure 38 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 is U-shaped. The body 32420 on both sides of the groove 32425 is attached to the stationary contact plate 3230 as mounting arms. In the figure, the inner edge of each mounting arm is provided with an arc-inducing leg 32423, and the outer edge of each mounting arm is provided with a support portion 32424. The length of the arc-inducing leg 32423 is greater than the length of the support portion 32424, forming an accommodating space between the arc-inducing 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.

[0135] When the grid plates in the two arc-extinguishing chambers are connected by an arc-initiating plate 335, 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. The other end of the arc-initiating plate 335 extends in a direction away from the stationary contact plate 3230, and 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 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.

[0136] 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.

[0137] In addition, the arc-extinguishing system also includes an exhaust port and an exhaust groove that cooperate with the arc-extinguishing chamber 33, wherein the exhaust port is disposed on the outer casing 1 of the circuit breaker, and the exhaust groove is disposed between the arc-extinguishing chamber 33 and the outer casing. Preferably, the arc-extinguishing system also includes a de-ignition element assembled on the exhaust port, thereby achieving zero arc flash.

[0138] like Figure 1 , 2As shown in Figure 7, at least one first exhaust port 3111 and at least one second exhaust port 3112 are provided on opposite sides of the housing. The contact system and the arc-extinguishing chamber 33 are located inside the housing between the first exhaust port 3111 and the second exhaust port 3112, and 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. One arc-extinguishing chamber is located between the first exhaust port 3111 and the contact system, and the other arc-extinguishing chamber is opposite the second exhaust port 3112 at the end away from the stationary contact assembly. That is, 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 exhaust port 3111 is connected to the side of the first arc-extinguishing chamber 331 opposite to the second arc-extinguishing chamber 332. In this embodiment, the first exhaust port 3111 and the first arc inlet port are respectively located on opposite sides of the first arc-extinguishing chamber 331. Preferably, the first exhaust port 3111 is located at the corner of the outer shell, and the arc-extinguishing grid plates 3360 of the first grid plate group 3361 are inclined in a direction that facilitates exhaust. The second exhaust port 3112 is connected to the end of the second arc-extinguishing chamber 332 opposite to the first arc-extinguishing chamber 331. That is, the first exhaust port 3111 and the second exhaust port 3112 are respectively located on opposite sides of the arc-extinguishing chamber 33, and the arc-extinguishing grid plates 3360 of the second grid plate group 3362 are preferably inclined in a direction that facilitates exhaust.

[0139] 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 from 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. In particular, when the inner diameter of the first exhaust port 3111 is smaller than the inner diameter of the inlet 32391 of the airflow channel 3239, the airflow preferentially exits from the airflow channel 3239, the second arc-extinguishing chamber 331, and the second exhaust port 3112, and finally exits from the first exhaust port 3111. Preferably, 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.

[0140] Furthermore, an exhaust groove is provided between the side of the arc-extinguishing chamber 33 facing away from the contact system and the outer shell, and one end of the exhaust groove is connected to the second exhaust port 3112. In this embodiment, an exhaust groove is formed between the side of the second arc-extinguishing chamber 332 facing away from the contact system and the outer shell. The inner diameter of the exhaust groove gradually increases at the end near the second exhaust port 3112, which is conducive to forming a pressure gradient and facilitating gas outflow. Of course, when the conductive unit has a separate shell, the exhaust groove is located between the second arc-extinguishing chamber 332 and the shell, and the first exhaust port 3111 and the second exhaust port 3112 are also correspondingly arranged on opposite sides of the shell.

[0141] In this embodiment, when the stationary contact plate 3230 is arranged along the outer side of the arc extinguishing chamber, the movement principle of its arc within the two arc extinguishing chambers is similar to the prior art; the arc extinguishing process of the stationary contact plate 3230 penetrating one of the arc extinguishing chambers is described in [reference needed]. Figure 2-7 The black arc represents the electric arc, and the specific process is as follows:

[0142] like Figure 3 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.

[0143] like Figure 4 As 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.

[0144] like Figure 5 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.

[0145] like Figure 6 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.

[0146] like Figure 7 As 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.

[0147] 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. In this process, the arc-initiating plate 335 plays the roles of arc initiation, arc running and series connection.

[0148] 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.

[0149] 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. An arc-extinguishing system, comprising an arc-extinguishing chamber (33) cooperating with a contact system, the arc-extinguishing chamber (33) comprising two interconnected arc-extinguishing cavities, each arc-extinguishing cavity being provided with at least one grid plate assembly, the contact system comprising a cooperating moving contact assembly and a stationary contact assembly, characterized in that: The two arc-extinguishing cavities are arranged at an angle, and the stationary contact assembly is disposed at the junction of the two arc-extinguishing cavities. The stationary contact assembly includes a stationary arc-leading angle (334). The opening and closing trajectory of the moving contact assembly and one end of the stationary arc-leading angle (334) correspond to the arc inlet of one of the arc-extinguishing cavities. The other end of the stationary arc-leading angle (334) extends to the other arc-extinguishing cavity. The grid plate groups in the two arc-extinguishing cavities are connected at the junction of the two arc-extinguishing cavities.

2. The arc-extinguishing system according to claim 1, characterized in that: The inner diameter of the arc inlet corresponding to the opening and closing trajectory of the moving contact assembly is greater than the inner diameter of the connecting port at the junction of the two arc extinguishing cavities.

3. The arc-extinguishing system according to claim 1, characterized in that: The stationary contact assembly further includes a stationary contact plate (3230), which corresponds to the same arc-extinguishing cavity as the moving contact assembly. The stationary contact plate (3230) is provided with a contact portion (3231) and a wiring portion (3232) spaced apart from each other. The contact portion (3231) is connected to one end of the stationary arc-starting angle (334) and cooperates with the moving contact assembly. The wiring portion (3232) is located on the side of the arc-extinguishing cavity opposite to the moving contact assembly.

4. The arc-extinguishing system according to claim 3, characterized in that: The contact portion (3231) and the wiring portion (3232) are respectively disposed at both ends of the stationary contact plate (3230). The stationary contact plate (3230) connected between the contact portion (3231) and the wiring portion (3232) forms a mating area (3238). One end of the stationary arc-starting angle (334) is provided with a stationary arc-starting portion (3341). The stationary arc-starting portion (3341) passes through the mating area (3238) and connects with the contact portion (3231). The mating area (3238) cooperates with one of the arc-extinguishing cavities to start an arc.

5. The arc-extinguishing system according to claim 4, 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 one of the arc-extinguishing chambers, 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).

6. The arc-extinguishing system according to claim 4, characterized in that: A stationary contact plate (3230) connecting the contact part (3231) and the wiring part (3232) is disposed through one of the arc extinguishing cavities. The stationary contact plate (3230) located in the arc extinguishing cavity has a through hole as a mating area (3238).

7. The arc-extinguishing system according to claim 6, characterized in that: An arc-guiding plate (335) is also provided in the mating area (3238). The arc-guiding plate (335) and the stationary arc-guiding part (3341) are spaced apart to form an airflow channel (3239). The stationary arc-guiding part (3341) is provided with a protruding arc-guiding protrusion (33410). The arc-guiding protrusion (33410) makes the inner diameter of the inlet (32391) of the airflow channel (3239) smaller than the inner diameter of the outlet (32392) of the airflow channel (3239).

8. The arc extinguishing system according to claim 4, characterized in that: The other end of the static arc angle (334) extends in a direction away from the static contact plate (3230), such that the other end of the static arc angle (334) exceeds the tail end of the grid plate group corresponding to the static arc angle (334), or, the other end of the static arc angle (334) is flush with the tail end of the grid plate group corresponding to the static arc angle (334).

9. The arc-extinguishing system according to claim 8, characterized in that: Another arc-extinguishing cavity is provided with a positioning rib (33043), and the middle part of the static arc-drawing angle (334) is located on the positioning rib (33043).

10. The arc-extinguishing system according to claim 3, characterized in that: The arc-extinguishing chamber (33) also includes a moving arc-starting angle (333), which is spaced apart from the stationary contact plate (3230) and corresponds to the arc inlet of the same arc-extinguishing chamber. The moving arc-starting angle (333) is adjacent to the moving contact assembly at the opening position.

11. The arc-extinguishing system according to claim 1, characterized in that: An arc-initiating plate (335) and / or a connecting plate group (3363) are provided between the two arc-extinguishing chambers.

12. The arc-extinguishing system according to claim 1, characterized in that: The arc-extinguishing chamber (33) includes a pair of side plates (3303), each pair of side plates (3303) being spaced apart to form an arc-extinguishing chamber. At least one pair of spaced-apart gas-generating elements (3304) are provided between each pair of side plates (3303). The grid plate group includes a plurality of spaced-apart arc-extinguishing grid plates (3360). The two sides of each arc-extinguishing grid plate (3360) are connected to the side plates (3303) respectively. One end of each arc-extinguishing grid plate (3360) is provided with an arc-extinguishing notch (33601), so that the legs (33602) located on both sides of the arc-extinguishing notch (33601) are wrapped by the gas-generating elements (3304).

13. The arc-extinguishing system according to claim 12, characterized in that: The gas generating component (3304) is provided with a plurality of baffles (33041), each baffle (33041) being separated between the legs (33602) on the same side of two adjacent arc-extinguishing grid plates (3360), and the width of each baffle (33041) is less than the width of each leg (33602), so that a gap as a slit (3305) is left between each baffle (33041) and the side plate (3303), the slit (3305) corresponding to the area of ​​the leg (33602) near the side plate (3303).

14. The arc-extinguishing system according to claim 13, characterized in that: The ribs (33041) of the two gas generating components (3304) are spaced apart to form a longitudinal slit (3306), the longitudinal slit (3306) is located inside the arc extinguishing notch (33601), and the opening width of the longitudinal slit (3306) is smaller than the opening width of the arc extinguishing notch (33601).

15. The arc-extinguishing system according to claim 14, characterized in that: The arc-extinguishing notch (33601) has at least one notch (33603) at its central edge. When the central axis of the notch (33603) deviates from the axis of the arc-extinguishing notch (33601), the notches (33603) of adjacent arc-extinguishing grid plates (3360) are staggered.

16. The arc-extinguishing system according to claim 15, characterized in that: Each arc-extinguishing chamber is formed by a pair of side plates (3303), and a pair of gas-generating elements (3304) are provided between each pair of side plates (3303), so that the two arc-extinguishing chambers form a separate structure; or, the two arc-extinguishing chambers share a pair of L-shaped side plates (3303), and a pair of gas-generating elements (3304) are provided between the pair of L-shaped side plates (3303), so that the two arc-extinguishing chambers form an integral structure.

17. The arc-extinguishing system according to claim 12, characterized in that: It also includes an arc-blocking plate, which is disposed outside the side plate (3303).

18. The arc-extinguishing system according to any one of claims 1-17, characterized in that: The two arc-extinguishing chambers are a first arc-extinguishing chamber (331) and a second arc-extinguishing chamber (332). The grid plate group of the first arc-extinguishing chamber (331) is the first grid plate group (3361), and the grid plate group of the second arc-extinguishing chamber (332) is the second grid plate group (3362). The moving contact assembly and the stationary contact assembly are spaced apart on both sides of the first arc inlet of the first arc-extinguishing chamber (331). The first end of the second grid plate group (3362) and the tail end of the first grid plate group (3361) are connected at the junction of the two arc-extinguishing chambers. The first end of the first grid plate group (3361) is adjacent to the moving contact assembly at the open position, and the tail end of the second grid plate group (3362) extends in a direction away from the first arc-extinguishing chamber (331).

19. The arc-extinguishing system according to claim 18, characterized in that: The first grid group (3361) includes a main grid group and a sub-grid group. The main grid group is spaced apart from the first arc inlet. The two ends of the main grid group are respectively connected at an angle to the second grid group (3362) and the sub-grid group. The sub-grid group is parallel to the second grid group (3362).

20. The arc-extinguishing system according to claim 18, characterized in that: The stationary contact assembly has a stationary arc-drawing angle extending away from the first arc-extinguishing cavity (331), and the second grid plate group (3362) gradually decreases in distance from the stationary arc-drawing angle (334) along the direction from the first end to the last end.

21. The arc-extinguishing system according to claim 18, characterized in that: The distance between the first arc-extinguishing cavity (331) opposite to the first arc inlet 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).

22. A circuit breaker, comprising a housing and a contact system disposed within the housing, characterized in that: The outer casing is further provided with an arc extinguishing system as described in any one of claims 1-21.

23. The circuit breaker according to claim 22, characterized in that: At least one first exhaust port (3111) and at least one second exhaust port (3112) are provided on opposite sides of the housing, and 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 contact system and the arc-extinguishing chamber (33) are located inside the housing between the first exhaust port (3111) and the second exhaust port (3112). One of the arc-extinguishing chambers is located between the first exhaust port (3111) and the contact system, and the other arc-extinguishing chamber is located at the end away from the stationary contact assembly opposite to the second exhaust port (3112).

24. The circuit breaker according to claim 23, characterized in that: The arc-extinguishing chamber (33) has an exhaust groove between the side facing away from the contact system and the outer casing, and one end of the exhaust groove is connected to the second exhaust port (3112).

25. The circuit breaker according to claim 24, characterized in that: The inner diameter of the exhaust groove gradually increases at the end near the second exhaust port (3112).

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