Arc extinguishing system of circuit breaker and circuit breaker

Abstract

The application provides an arc extinguishing system of a circuit breaker and the circuit breaker, the circuit breaker comprising a contact system and an exhaust port, the contact system comprising a first contact and a second contact, the second contact being rotatable relative to the first contact, the arc extinguishing system comprising a housing, an arc extinguishing device and an arc leading device. The housing has a receiving cavity, the receiving cavity comprising a first arc extinguishing area and a second arc extinguishing area arranged along a first direction; the arc extinguishing device is located in the receiving cavity, the arc extinguishing device comprising a first arc extinguishing chamber located at least partially in the first arc extinguishing area, a second arc extinguishing chamber located at least partially in the second arc extinguishing area and a first arc guiding member, the first arc extinguishing chamber and the second arc extinguishing chamber being overlapped in projection on a first plane along the first direction, and the first arc extinguishing chamber and the second arc extinguishing chamber being electrically connected through the first arc guiding member, wherein the first plane is perpendicular to the first direction; the arc leading device is used for leading an electric arc into the first arc extinguishing chamber and the second arc extinguishing chamber. The arc extinguishing system of the application improves the breaking capacity of the arc extinguishing system and meets the use requirements of AC / DC systems.

Description

[0001] Related Applications

[0002] The present application claims priority to Chinese Patent Application No. 202122932666.9, filed on November 26, 2021, entitled "Arc extinguishing system of circuit breaker and circuit breaker". TECHNICAL FIELD

[0003] The present application relates to the technical field of circuit breakers, and in particular to an arc extinguishing system of a circuit breaker and the circuit breaker. BACKGROUND

[0004] A circuit breaker refers to a switching device capable of making, carrying and breaking the current under normal circuit conditions and capable of making, carrying and breaking the current under abnormal circuit conditions within a specified time. Generally, a circuit breaker uses an arc extinguishing chamber to extinguish an arc. The arc extinguishing chamber uses metal grid plates arranged in a stacked manner to cut the arc, forcing the long arc to be divided into multiple short arcs to achieve arc voltage division and cooling. Among them, the arc voltage drop is the voltage that maintains the arc continuous burning. The minimum arc burning voltage in standard atmospheric pressure air is several tens of volts. When the arc enters enough arc extinguishing grid plates, the power supply voltage is not enough to support the minimum arc burning voltage, and the arc is extinguished. When the arc is extinguished, the metal grid plates help the arc to cool down to avoid the voltage of the next cycle from breaking down again to cause re-arc.

[0005] In the current AC / DC system, the power supply voltage has been increased to 1000V or even 1500V. In existing products, generally only one arc extinguishing chamber is provided, and the grid plates and the gaps between the grid plates that can be arranged are almost fixed, so it is difficult to improve the arc voltage drop. Under high voltage levels, the breaking capacity of the existing arc extinguishing chamber is limited. SUMMARY

[0006] The embodiments of the present application provide an arc extinguishing system of a circuit breaker and the circuit breaker to at least solve the problem that the breaking capacity of the existing circuit breaker is limited and it is difficult to meet the use requirements of high voltage levels in AC / DC systems.

[0007] In a first aspect, the embodiments of the present application provide an arc extinguishing system of a circuit breaker, the circuit breaker comprising a contact system and an exhaust port, the contact system comprising a first contact and a second contact, the second contact being capable of rotating relative to the first contact to turn on or turn off a circuit, when the circuit is turned off, an arc is generated between the second contact and the first contact, and the arc extinguishing system comprising:

[0008] a housing having a receiving cavity, the receiving cavity comprising a first arc extinguishing area and a second arc extinguishing area arranged along a first direction, the first contact and the second contact being located on one side of the first arc extinguishing area away from the second arc extinguishing area in the receiving cavity;

[0009] An arc extinguishing device is located in the accommodating cavity, and the arc extinguishing device comprises a first arc extinguishing chamber located at least partially in the first arc extinguishing area, a second arc extinguishing chamber located at least partially in the second arc extinguishing area, and a first arc conducting member, a projection of the first arc extinguishing chamber and the second arc extinguishing chamber on a first plane in the first direction overlaps, and the first arc extinguishing chamber and the second arc extinguishing chamber can be electrically connected through the first arc conducting member, wherein the first plane is perpendicular to the first direction.

[0010] An arc striking device is used to introduce the electric arc into the first arc extinguishing chamber and the second arc extinguishing chamber.

[0011] In some embodiments, the first arc extinguishing chamber comprises a first end and a second end opposite in the stacking direction, the second arc extinguishing chamber comprises a third end and a fourth end opposite in the stacking direction, the second end and the third end can be electrically connected through the first arc conducting member, the first end can be electrically connected with the second contact, the fourth end can be electrically connected with the first contact, the first end exceeds the third end in the direction in which the second end points to the first end, the fourth end exceeds the second end in the direction in which the third end points to the fourth end, the projection of the first arc extinguishing chamber on the first plane in the first direction covers the projection of the third end on the first plane in the first direction.

[0012] In some embodiments, a first insulating member is provided in close contact with the first arc conducting member, for electrically isolating the first arc extinguishing chamber and the part of the first arc conducting member opposite to the first arc extinguishing chamber in the first direction.

[0013] In some embodiments, the first arc conducting member has a first surface and a second surface opposite, the first arc conducting member comprises a first arc conducting segment, a first connecting segment, a second connecting segment and a second arc conducting segment connected in sequence, the first arc conducting segment and the first connecting segment are bent towards the first surface, the first connecting segment and the second connecting segment are bent towards the second surface, the second connecting segment and the second arc conducting segment are bent towards the second surface and form an accommodating cavity, the first arc conducting segment is stacked with the third end and the first surface of the first arc conducting segment faces the second arc extinguishing chamber, and the second arc conducting segment is stacked with the second end and the first surface of the second arc conducting segment faces the first arc extinguishing chamber.

[0014] In some embodiments, the first insulating member comprises a first insulating segment, a second insulating segment and a third insulating segment connected in sequence, the first insulating segment is in close contact with the second surface of the first arc conducting segment, the second insulating segment is in close contact with the second surface of the first connecting segment, and the third insulating segment is located in the accommodating cavity.

[0015] In some embodiments, the first insulating member further includes an arc-blocking portion and a flow-diverting portion. The arc-blocking portion is disposed at the bend of the second insulating section and the third insulating section and is located on the side of the first arc-extinguishing chamber near the second arc-extinguishing zone, for preventing the arc in the first arc-extinguishing chamber from moving to the second arc-extinguishing zone. The arc-blocking portion is formed with a plurality of first vent holes adapted to the first arc-extinguishing chamber, and the gas generated by the arc in the first arc-extinguishing chamber can flow to the second arc-extinguishing zone along the second insulating section through the first vent holes. The flow-diverting portion is disposed on the side of the first insulating section away from the first arc-conducting section, for diverting the gas generated by the arc.

[0016] In some embodiments, a second insulating member is further included, which is located on the side of the second arc-extinguishing chamber opposite to the first arc-extinguishing chamber, for preventing back-side breakdown of the second arc-extinguishing chamber. The second insulating member has a plurality of second vent holes adapted to the second arc-extinguishing chamber so that the gas generated by the electric arc in the second arc-extinguishing chamber flows to the exhaust port through the second vent holes.

[0017] In some embodiments, the system further includes two opposing arc-blocking members, each comprising a first arc-blocking segment, a second arc-blocking segment, and a third arc-blocking segment connected in sequence. The first arc-blocking segment is located on the side of the first arc-extinguishing chamber away from the second arc-extinguishing chamber, the second arc-blocking segment is located on the side of the second end of the first arc-extinguishing chamber away from the first end, and the third arc-blocking segment is located on the side of the second arc-extinguishing chamber close to the first arc-extinguishing chamber and is partially sandwiched between the first arc-guided member and the second arc-extinguishing chamber. A narrow gap is formed between the two arc-blocking members to allow the electric arc to move along the narrow gap into the first arc-extinguishing chamber and the second arc-extinguishing chamber.

[0018] In some embodiments, the first arc-extinguishing chamber includes a plurality of stacked first grid plates. Each first grid plate includes a first body and two first extensions. The first extensions extend from the first body toward a side away from the second arc-extinguishing chamber. The two first extensions are disposed opposite to each other and cooperate with the two first arc-blocking segments respectively to form a magnetic field that causes the electric arc to move toward the first arc-extinguishing chamber.

[0019] In some embodiments, the second arc-extinguishing chamber includes a plurality of stacked second and third grid plates, with the plurality of second grid plates located in the middle of the second arc-extinguishing chamber and the plurality of third grid plates located on both sides of the second grid plates. The second grid plate includes a second body and two second extensions, which extend from the second body toward the contact system. The two second extensions are disposed opposite to each other and cooperate with the two arc-blocking members respectively to form a magnetic field that causes the electric arc to move toward the second arc-extinguishing chamber.

[0020] In some embodiments, the device further includes a third arc-extinguishing chamber and a second arc-guiding element. The third arc-extinguishing chamber is located in the first arc-extinguishing zone. The first and third arc-extinguishing chambers are arranged in a direction from the first end to the second end. The third arc-extinguishing chamber includes a fifth end and a sixth end that are opposite in the stacking direction. The fifth end is located between the sixth end and the second end. The fifth end can be electrically connected to the fourth end through the second arc-guiding element. The sixth end can be electrically connected to the first contact through the arc-initiating device. The projections of the second and third arc-extinguishing chambers onto the first plane overlap along a first direction.

[0021] In some embodiments, the arc-initiating device includes a first arc-initiating element and a second arc-initiating element. One end of the first arc-initiating element is connected to the first contact, and the other end of the first arc-initiating element is stacked with the fourth end of the second arc-extinguishing chamber. One end of the second arc-initiating element is electrically connected to the second contact, and the other end of the second arc-initiating element is stacked with the first end of the first arc-extinguishing chamber.

[0022] Secondly, this application provides a circuit breaker including the arc extinguishing system of the circuit breaker described above.

[0023] The arc-extinguishing system of the circuit breaker provided in this application embodiment includes a first arc-extinguishing chamber and a second arc-extinguishing chamber, which are staggered in a first direction. This staggered arrangement significantly saves space. Therefore, the arc-extinguishing system of the circuit breaker provided in this application embodiment makes full use of the limited space within the casing, arranging two arc-extinguishing chambers for arc extinguishing, greatly increasing the number of grid plates, significantly improving the arc voltage drop, and enhancing the breaking capacity of the arc-extinguishing system, fully meeting the usage requirements of high-voltage AC / DC systems. Attached Figure Description

[0024] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structure of a circuit breaker according to an embodiment of this application;

[0026] Figure 2 yes Figure 1 The diagram shows the structural schematic of the contact system and arc extinguishing system in the circuit breaker.

[0027] Figure 3 This is an exploded view of the arc extinguishing system according to an embodiment of this application;

[0028] Figure 4 yes Figure 3 The diagram shows a partial structural schematic of the arc-extinguishing system.

[0029] Figure 5 yes Figure 3The diagram shows the structure of the first insulating component in the arc extinguishing system.

[0030] Figure 6 yes Figure 3 The diagram shows the assembly of the first arc-extinguishing chamber, the first insulating component, and the first arc-guiding component in the arc-extinguishing system.

[0031] Figure 7 yes Figure 3 The diagram shows the structure of the second insulator in the arc extinguishing system.

[0032] Figure 8 yes Figure 3 The diagram shows a partial structural schematic of the assembled arc extinguishing system.

[0033] Figure 9 yes Figure 3 The diagram shows the structure of the arc-isolating component in the arc-extinguishing system.

[0034] Figure 10 yes Figure 3 The diagram shows the structure of the first and second arc-extinguishing chambers in the arc-extinguishing system.

[0035] Figure 11 yes Figure 10 A schematic diagram of the structure of the first grid plate in the first arc-extinguishing chamber;

[0036] Figure 12 yes Figure 10 A schematic diagram of the structure of the third grid plate in the second arc-extinguishing chamber;

[0037] Figure 13 yes Figure 3 The diagram shows the assembled structure of the arc-extinguishing system.

[0038] Figure 14 This is another structural schematic diagram of the circuit breaker according to an embodiment of this application;

[0039] Figure 15 yes Figure 14 A schematic diagram of the arc-extinguishing system of the circuit breaker shown.

[0040] Figure 16 yes Figure 15 The diagram shows the explosive structure of the arc-extinguishing system.

[0041] Figure 17 This is a schematic diagram of the arc current flow of a circuit breaker according to an embodiment of this application;

[0042] Figure 18 This is a schematic diagram of the current flow and high-temperature gas diffusion of the circuit breaker in the early stage of breaking according to an embodiment of this application;

[0043] Figure 19This is a schematic diagram of the current flow and high-temperature gas diffusion of the circuit breaker during the breaking phase in an embodiment of this application.

[0044] Figure 20 This is a schematic diagram of the current flow and high-temperature gas diffusion of the circuit breaker in the later stage of breaking according to an embodiment of this application.

[0045] Figure 21 This is a schematic diagram of the current flow and high-temperature gas diffusion of the circuit breaker in an embodiment of this application when it is fully disconnected;

[0046] Figure 22 This is another structural schematic diagram of the circuit breaker according to an embodiment of this application.

[0047] Figure label:

[0048] 1. Shell;

[0049] 11. First arc-extinguishing zone;

[0050] 12. Second arc-extinguishing zone;

[0051] 131. First side plate; 132. Second side plate; 133. Mounting hole; 15. First arc-blocking wall; 16. Second arc-blocking wall;

[0052] 14. Arc blocking sheet;

[0053] 2. Arc extinguishing device;

[0054] 21. First arc-extinguishing chamber; 211. First end; 212. Second end; 213. First grid plate; 214. First body; 215. First extension; 216. First groove;

[0055] 22. Second arc-extinguishing chamber; 221. Third end; 222. Fourth end; 223. Second grid plate; 224. Third grid plate; 225. Second body; 226. Second extension; 227. Third groove;

[0056] 23. First arc guide component; 231. First surface; 232. Second surface; 233. First arc guide segment; 234. First connecting segment; 235. Second connecting segment; 236. Second arc guide segment;

[0057] 2310, First guide arc segment; 2320, First curved segment; 2330, Second guide arc segment; 2340, First straight segment; 2350, First curved segment; 2360, Second straight segment;

[0058] 24. The third arc-extinguishing chamber;

[0059] 25. Second guide arc component; 251. Third guide arc segment; 252. Second curved segment; 253. Fourth guide arc segment; 254. Third straight segment; 255. Second curved segment; 256. Fourth straight segment;

[0060] 26. Eliminate free plate;

[0061] 27. First insulating component; 271. First insulating section; 272. Second insulating section; 273. Third insulating section; 274. Arc-blocking part; 275. Diverting part; 276. First vent hole;

[0062] 28. Second insulating component; 281. Second vent hole;

[0063] 29. Arc-blocking component; 291. First arc-blocking segment; 292. Second arc-blocking segment; 293. Third arc-blocking segment; 294. Narrow slit; 295. First receiving part; 296. Second receiving part;

[0064] 3. Arc-starting device;

[0065] 31. First arc-starting component; 311. First arc-starting segment; 312. First straight plate segment; 313. First arc-starting part; 314. Connecting part; 315. Second arc-starting part;

[0066] 32. Second arc-starting component; 321. Second arc-starting segment; 322. Second straight plate segment; 323. Jumping part; 324. First guide part;

[0067] 51. First isolation plate; 52. Second isolation plate; 53. First connector; 54. Second connector;

[0068] 61. First arc-blowing component; 62. Second arc-blowing component;

[0069] 7. Incoming cable tray;

[0070] 8. Cable runner;

[0071] 9. Contact system; 91. First contact; 92. Second contact;

[0072] 10. Exhaust port;

[0073] X, first direction;

[0074] Y, the second direction;

[0075] Z, Third-party orientation. Detailed Implementation

[0076] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0077] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0078] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0079] To better understand this application, the following will be combined with... Figures 1 to 22 The embodiments of this application are described below.

[0080] Figure 1 This is a schematic diagram of the structure of a circuit breaker according to an embodiment of this application. Figure 2 yes Figure 1 The diagram shown illustrates the structure of the contact system and arc-extinguishing system in the circuit breaker. Figure 3 This is an exploded structural diagram of the arc extinguishing system according to an embodiment of this application.

[0081] Please see Figure 1 , Figure 2 and Figure 3 This application provides an arc extinguishing system for a circuit breaker. The circuit breaker includes a contact system 9 and a housing. The housing is used to house the contact system 9 and the arc extinguishing system. The housing has an exhaust port. The contact system 9 includes a first contact 91 and a second contact 92. The second contact 92 is rotatable relative to the first contact 91 to connect or disconnect the circuit. When the circuit is disconnected, an electric arc is generated between the second contact 92 and the first contact 91.

[0082] Optionally, the first contact 91 is a stationary contact, and the second contact 92 is a moving contact. It should be noted that the first contact 91 can also be a movable contact.

[0083] The arc extinguishing system includes a housing 1, an arc extinguishing device 2, and an arc ignition device 3.

[0084] The housing 1 has a receiving cavity, which includes a first arc-extinguishing region 11 and a second arc-extinguishing region 12 arranged along a first direction X. A first contact 91 and a second contact 92 are located in the receiving cavity on the side of the first arc-extinguishing region 11 away from the second arc-extinguishing region 12. That is, the contact system 9, the first arc-extinguishing region 11, and the second arc-extinguishing region 12 are arranged sequentially along the first direction X. The exhaust port communicates with the second arc-extinguishing region 12, that is, it is located on the side of the second arc-extinguishing region 12 away from the first arc-extinguishing region 11.

[0085] The arc-extinguishing device 2 is located in the receiving cavity. The arc-extinguishing device 2 includes a first arc-extinguishing chamber 21 at least partially located in the first arc-extinguishing zone 11, a second arc-extinguishing chamber 22 at least partially located in the second arc-extinguishing zone 12, and a first arc-guiding element 23. The projections of the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 onto a first plane along a first direction X overlap, and the two are electrically connected through the first arc-guiding element 23. The first plane is perpendicular to the first direction. It should be noted that the electrical connection refers to the generation of an electric arc when the first contact 91 and the second contact 92 are disconnected. The electric arc forms an arc current in each component, thus connecting the circuit and forming an electrical connection.

[0086] In one embodiment, the projection portions of the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 onto the first plane along the first direction X overlap.

[0087] In another embodiment, the projection of the second arc-extinguishing chamber 22 along the first direction X onto the first plane completely covers the projection of the first arc-extinguishing chamber 21 along the first direction X onto the first plane.

[0088] In another embodiment, the projection of the first arc-extinguishing chamber 21 along the first direction X onto the first plane completely covers the projection of the second arc-extinguishing chamber 22 along the first direction X onto the first plane.

[0089] In one embodiment, the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 are stacked along a third direction Z, which is perpendicular to the first direction X. Of course, the angles formed by the stacking directions of the first and second arc-extinguishing chambers 21 and the first direction X can also be other angles, such as 80°-100°, meaning the stacking directions of the first and second arc-extinguishing chambers 21 can be different. The angles formed by the stacking directions of the first and second arc-extinguishing chambers 21 and the first direction X must satisfy the requirement that the arc can be cut by both of them.

[0090] Furthermore, the angle between the stacking direction of the first arc-extinguishing chamber 21 and the stacking direction of the second arc-extinguishing chamber 22 ranges from 0° to 10°. The angle between these two directions must ensure that the electric arc can be cut by both.

[0091] Arc-initiating device 3 is used to introduce the electric arc into the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22.

[0092] It should be noted that when the electric arc enters the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22, it means that the electric arc is cut by the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22, and the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 form a series electrical connection.

[0093] During the circuit breaking process, the arc current generated by the arc flows sequentially from the first contact 91 to the arc-initiating device 3, the arc-extinguishing device 2, the arc-initiating device 3 and the second contact 92, or sequentially from the second contact 92 to the arc-initiating device 3, the arc-extinguishing device 2, the arc-initiating device 3 and the first contact 91. Regardless of the direction of the arc current, the magnetic field generated by the arc current itself causes the arc to be blown towards the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 along the first direction X. That is, without the action of other arc-blowing devices, the arc can still be introduced into the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 for arc extinguishing by the self-blowing effect of the arc current and the guiding effect of the arc-initiating device 3.

[0094] The arc-extinguishing system of the circuit breaker provided in this embodiment includes a first arc-extinguishing chamber 21 and a second arc-extinguishing chamber 22, which are staggered in the first direction X. This staggered arrangement significantly saves space. Therefore, the arc-extinguishing system of the circuit breaker provided in this embodiment makes full use of the limited space within the housing 1, arranging two arc-extinguishing chambers for arc extinguishing. This greatly increases the number of grid plates, significantly improves the arc voltage drop, and enhances the breaking capacity of the arc-extinguishing system, fully meeting the usage requirements of high-voltage AC / DC systems.

[0095] Example 1

[0096] In some embodiments, the first arc-extinguishing chamber 21 includes a first end 211 and a second end 212 opposite to each other in the stacking direction, and the second arc-extinguishing chamber 22 includes a third end 221 and a fourth end 222 opposite to each other in the stacking direction. The second end 212 and the third end 221 can be electrically connected through the first arc-guiding member 23. The first end 211 can be electrically connected to the second contact 92, and the fourth end 222 can be electrically connected to the first contact 91. The first end 211 extends beyond the third end 221 in the direction from the second end 212 to the first end 211, and the fourth end 222 extends beyond the second end 212 in the direction from the third end 221 to the fourth end 222. The projection of the first arc-extinguishing chamber 21 along the first direction X on the first plane covers the projection of the third end 221 along the first direction X on the first plane.

[0097] The first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 are arranged in an alternating structure. The first end 211 of the first arc-extinguishing chamber 21 extends beyond the third end 221 of the second arc-extinguishing chamber 22 in the direction pointing from the second end 212 to the first end 211. Similarly, the fourth end 222 of the second arc-extinguishing chamber 22 extends beyond the second end 212 of the first arc-extinguishing chamber 21 in the direction pointing from the third end 221 to the fourth end 222. This arrangement creates a blank area in the first arc-extinguishing zone 11 opposite to the second arc-extinguishing chamber 22 in the first direction X, allowing the electric arc to more easily enter and be cut within the second arc-extinguishing chamber 22. Furthermore, the second arc-extinguishing zone 12 also has a blank area opposite to the first arc-extinguishing chamber 21 in the first direction X, allowing the gas generated after arc cutting in the first arc-extinguishing chamber 21 to be more easily discharged through this blank area.

[0098] Figure 4 yes Figure 3 The diagram shows a partial structural schematic of the arc extinguishing system.

[0099] Please see Figure 4 In some embodiments, the arc extinguishing system may further include a first insulating element 27, which is fitted to the first arc guide element 23 to provide electrical isolation between the first arc extinguishing chamber 21 and the portion of the first arc guide element 23 opposite to the first arc extinguishing chamber 21 in a first direction and to prevent back-side breakdown of the first arc extinguishing chamber 21.

[0100] Please see Figure 1 and Figure 4 Under the magnetic blow-out action, the arc is blown from the position of the contact system 9 along the first direction X towards the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22. In the first arc-extinguishing chamber 21, the arc, under the magnetic blow-out action, will still bend towards the second arc-extinguishing zone 12. As a result, the arc under the magnetic blow-out action is easily blown out of the first arc-extinguishing chamber 21, causing the arc to break down outside the first arc-extinguishing chamber 21, and may even come into contact with the first arc-guiding member 23, causing a short circuit. This prevents the arc from being completely cut by the grid of the first arc-extinguishing chamber 21. Therefore, the first insulating member 27 is provided to insulate the first arc-extinguishing chamber 21 and the portion of the first arc-guiding member 23 that is directly opposite to the first arc-extinguishing chamber 21 in the first direction X from each other. This can prevent short circuits and also prevent breakdown behind the first arc-extinguishing chamber 21, ensuring that the arc is completely cut by the first arc-extinguishing chamber 21 and ensuring the arc-extinguishing effect. The portion of the first arc-guiding member 23 that is directly opposite to the first arc-extinguishing chamber 21 in the first direction X includes the first connecting section 234.

[0101] It should be noted that the width of the first insulating member 27 should be wider than the width of the first arc guiding member 23, that is, the length of the first insulating member 27 along the second direction Y is greater than the length of the first arc guiding member 23 along the second direction Y, so as to ensure complete insulation between the first arc extinguishing chamber 21 and the part of the first arc guiding member 23 that is directly opposite to the first arc extinguishing chamber 21 in the first direction X.

[0102] Please seeFigure 2 In some embodiments, the first arc guide 23 has a first surface 231 and a second surface 232 facing away from each other. The first arc guide 23 includes a first arc guide segment 233, a first connecting segment 234, a second connecting segment 235, and a second arc guide segment 236 that are bent and connected in sequence. The first arc guide segment 233 and the first connecting segment 234 are bent toward the first surface 231, the first connecting segment 234 and the second connecting segment 235 are bent toward the second surface 232, and the second connecting segment 235 and the second arc guide segment 236 are bent toward the second surface 232 to form a receiving cavity. The first arc guide segment 233 is stacked with the third end 221 and the first surface 231 of the first arc guide segment 233 faces the second arc extinguishing chamber 22. The second arc guide segment 236 is stacked with the second end 212 and the first surface 231 of the second arc guide segment 236 faces the first arc extinguishing chamber 21.

[0103] In one embodiment, the first guide segment 233, the second connecting segment 235, and the second guide segment 236 are parallel to each other. Furthermore, the first guide segment 233, the second connecting segment 235, and the second guide segment 236 are all plate-like structures, and all three are parallel to the first direction X.

[0104] The first arc guide 23 is configured as a first arc guide segment 233, a first connecting segment 234, a second connecting segment 235, and a second arc guide segment 236 that are sequentially bent and connected, such that the first arc guide segment 233 and the second arc extinguishing chamber 22 are stacked, and the second arc guide segment 236 and the first arc extinguishing chamber 21 are stacked. There are gaps between adjacent grid plates in the first arc guide segment 233 and the second arc extinguishing chamber 22, and there are gaps between adjacent grid plates in the second arc guide segment 236 and the first arc extinguishing chamber 21. The presence of gaps increases the arc voltage drop, thereby improving the breaking capacity of the arc extinguishing system.

[0105] The first arc guide 23 has an arc-cutting function. The electric arc generated between the first contact 91 and the second contact 92 moves along the first direction X. When the electric arc comes into contact with the bend of the second connecting section 235 and the second arc guide section 236, it is divided by them. Then, the two segments of the electric arc are cut into the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 respectively under the guidance of the arc ignition device 3.

[0106] Figure 5 yes Figure 3 The diagram shows the structure of the first insulating component in the arc extinguishing system.

[0107] Please see Figure 5In some embodiments, the first insulating member 27 includes a first insulating segment 271, a second insulating segment 272 and a third insulating segment 273 that are bent and connected in sequence. The first insulating segment 271 is attached to the second surface 232 of the first arc-guided segment 233, the second insulating segment 272 is attached to the second surface 232 of the first connecting segment 234, and the third insulating segment 273 is located in the receiving cavity.

[0108] The first insulating component 27 is attached to the side of the first arc guide component 23 facing the first arc extinguishing chamber 21, which not only provides insulation but also saves space.

[0109] Figure 6 yes Figure 3 The diagram shows the assembly of the first arc-extinguishing chamber, the first insulating component, and the first arc-guiding component in the arc-extinguishing system.

[0110] Please see Figure 6 In one embodiment, the width of the first insulating segment 271 is greater than the width of the first arc-guiding segment 233, the width of the second insulating segment 272 is greater than the width of the first connecting segment 234, and the width of the third insulating segment 273 is greater than the width of either the second connecting segment 235 or the second arc-guiding segment 236. This arrangement ensures sufficient insulation between the first connecting segment 234 of the first arc-guiding member 23 and the first arc-extinguishing chamber 21, preventing the arc on the grid plate in the middle of the first arc-extinguishing chamber 21 from passing over the side end face of the first insulating member 27 and entering the first connecting segment 234 of the first arc-guiding member 23, thus avoiding a short circuit. It also prevents the arc from breaking down the receiving cavity between the second connecting segment 235 and the second arc-guiding segment 236.

[0111] In one embodiment, the first insulating segment 271, the second insulating segment 272, and the third insulating segment 273 are all plate-like structures. The first insulating segment 271 and the third insulating segment 273 are parallel to each other and both are parallel to the first direction X.

[0112] In some embodiments, the first insulating member 27 further includes an arc-blocking portion 274 and a flow-diverting portion 275. The arc-blocking portion 274 is disposed at the bend of the second insulating section 272 and the third insulating section 273 and is located on the side of the first arc-extinguishing chamber 21 near the second arc-extinguishing region 12. It is used to prevent the electric arc in the first arc-extinguishing chamber 21 from moving to the outside of the first arc-extinguishing chamber 21 and forming a back-end breakdown phenomenon. The arc-blocking portion 274 is formed with a plurality of first vent holes 276 adapted to the first arc-extinguishing chamber 21. The gas generated by the electric arc in the first arc-extinguishing chamber 21 can flow along the second insulating section 272 to the second arc-extinguishing region 12 through the first vent holes 276. The flow-diverting portion 275 is disposed on the side of the first insulating section 271 away from the first arc-guiding section 233 and is used to divert the gas generated by the electric arc.

[0113] In another embodiment, the arc-blocking portion 274 is formed with a plurality of first ventilation slots adapted to the first arc-extinguishing chamber 21, and the gas generated by the electric arc in the first arc-extinguishing chamber 21 can flow through the first ventilation slots along the second insulating section 272 to the second arc-extinguishing zone 12.

[0114] By providing the arc-blocking section 274, the electric arc is contained within the first arc-extinguishing chamber 21, preventing the arc from moving to the side of the first arc-extinguishing chamber 21 near the second arc-extinguishing chamber 22 and causing back-end breakdown. This ensures the arc is completely cut off by the first arc-extinguishing chamber 21, improving its arc-extinguishing capability. A flow-diverting section 275 is provided, through which the gas generated by the arc is diverted. Adjusting the size of the flow-diverting section 275 adjusts the gas outlet area of ​​the first arc-extinguishing chamber 21 at the flow-diverting section 275, thus adjusting the ratio of the outlet areas of the first and second arc-extinguishing chambers 21 to achieve optimal gas outlet performance. Furthermore, the flow-diverting section 275 provides structural support to the arc-blocking section 274.

[0115] In one embodiment, the arc-blocking portion 274 is a plate-like structure that fits against the end face of the first arc-extinguishing chamber 21 facing the second arc-extinguishing zone 12. A plurality of first vent holes 276 in the arc-blocking portion 274 can communicate with the first gap between any two adjacent grid plates in the first arc-extinguishing chamber 21.

[0116] Furthermore, each of the multiple first vent holes 276 corresponds one-to-one with the first gap between any two adjacent grid plates. The two first vent holes 276 corresponding to the two adjacent first gaps in the first arc-extinguishing chamber 21 are located on both sides of the extension direction of the arc-blocking portion 274, and the projections of the two first vent holes 276 on the first insulating member 27 along the extension direction do not overlap. The extension direction of the arc-blocking portion 274 is parallel to the grid plate stacking direction of the first arc-extinguishing chamber 21.

[0117] This design increases the structural strength of the arc-blocking part 274 while blocking the electric arc and ensuring gas flow.

[0118] In one embodiment, the current shunt 275 is integrally formed with the first insulating section 271, and the arc blocking section 274 and the current shunt 275 are integrally formed. Of course, the arc blocking section 274 and the current shunt 275 can also be provided separately, and this application does not impose any further limitations on this.

[0119] In one embodiment, the arc-blocking portion 274 is fixed at the bend of the second insulating section 272 and the third insulating section 273.

[0120] In one embodiment, the total area of ​​the first vent 276 is 300 mm². 2 This design ensures both the normal discharge of gas from the first arc-extinguishing chamber 21 and the structural strength of the arc-blocking part 274.

[0121] In one embodiment, the area of ​​the first vent 276 located at both ends of the arc-blocking portion 274 in the extending direction is larger than the area of ​​the first vent 276 in the middle of the arc-blocking portion 274. This arrangement guides the airflow to run more smoothly at both ends, thereby lengthening the electric arc, making it easier for it to be cut by the first arc-extinguishing chamber 21, and improving the arc-extinguishing effect.

[0122] Figure 7 yes Figure 3 The diagram shows the structure of the second insulating component in the arc extinguishing system.

[0123] Please see Figure 7 In some embodiments, the arc extinguishing system further includes a second insulating member 28, which is located on the side of the second arc extinguishing chamber 22 away from the first arc extinguishing chamber 21, and is used to prevent back-side breakdown of the second arc extinguishing chamber 22. The second insulating member 28 has a plurality of second vent holes 281 adapted to the second arc extinguishing chamber 22 so that the gas generated by the electric arc in the second arc extinguishing chamber 22 flows to the exhaust port through the second vent holes 281.

[0124] By setting the second insulating element 28, the electric arc is blocked in the second arc-extinguishing chamber 22, preventing the electric arc from moving to the side of the second arc-extinguishing chamber 22 away from the first arc-extinguishing chamber 21 and causing back-side breakdown. The electric arc can be completely cut off by the second arc-extinguishing chamber 22.

[0125] In one embodiment, the second insulating member 28 is a plate-like structure that is fitted into the second arc-extinguishing chamber 22. A plurality of second vent holes 281 in the second insulating member 28 are connected to the second gap between any two adjacent grid plates in the second arc-extinguishing chamber 22.

[0126] Furthermore, each of the plurality of second vent holes 281 corresponds one-to-one with the second gap between any two adjacent grid plates. The two second vent holes 281 corresponding to two adjacent second gaps in the second arc-extinguishing chamber 22 are located on both sides of the extending direction of the second insulating member 28, and the projections of the two second vent holes 281 along the extending direction onto the second plane do not overlap. The extending direction of the second insulating member 28 is parallel to the grid plate stacking direction of the second arc-extinguishing chamber 22, and the second plane is perpendicular to the extending direction of the second insulating member 28.

[0127] This design increases the structural strength of the second insulating component 28 while blocking electric arcs and ensuring gas flow.

[0128] In one embodiment, the total area of ​​the second vent 281 is 600 mm². 2 This design ensures both the normal discharge of gas from the second arc-extinguishing chamber 22 and the structural strength of the second insulating component 28.

[0129] In one embodiment, the total area of ​​the first vent 276 is smaller than the total area of ​​the second vent 281. Furthermore, the total area of ​​the first vent 276 is half the total area of ​​the second vent 281. This arrangement helps to optimize the ratio of the exhaust area of ​​the first arc-extinguishing chamber 21 to the second arc-extinguishing chamber 22, thereby achieving the best arc-extinguishing effect.

[0130] In one embodiment, the area of ​​the second vent holes 281 located at both ends of the second insulating member 28 in the extending direction is larger than the area of ​​the second vent hole 281 in the middle of the second insulating member 28. This arrangement guides the airflow to run more smoothly at both ends, thereby lengthening the arc and making it easier for it to be cut by the second arc-extinguishing chamber 22.

[0131] Figure 8 yes Figure 3 The diagram shown is a partial structural diagram of the assembled arc-extinguishing system. Figure 9 yes Figure 3 The diagram shows the structure of the arc-isolating component in the arc-extinguishing system.

[0132] Please see Figure 8 and Figure 9 In some embodiments, the arc-extinguishing system further includes two opposing arc-blocking components 29. Each arc-blocking component 29 includes a first arc-blocking segment 291, a second arc-blocking segment 292, and a third arc-blocking segment 293 connected in sequence. The first arc-blocking segment 291 is located on the side of the first arc-extinguishing chamber 21 facing away from the second arc-extinguishing chamber 22. The second arc-blocking segment 292 is located on the side of the second end 212 of the first arc-extinguishing chamber 21 facing away from the first end 211. The third arc-blocking segment 293 is located on the side of the second arc-extinguishing chamber 22 near the first arc-extinguishing chamber 21 and is partially sandwiched between the first arc-guiding component 23 and the second arc-extinguishing chamber 22. A narrow slit 294 is formed between the two arc-blocking components 29 to allow the electric arc to move along the narrow slit 294 into the first and second arc-extinguishing chambers 21 and 22. The arc-blocking components 29 are made of insulating material.

[0133] By setting up the arc-blocking element 29, the electric arc between the first contact 91 and the second contact 92 moves along the narrow gap 294 between the two arc-blocking elements 29 to the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22, and will not move to other positions, thus speeding up the movement process and improving the arc-extinguishing efficiency.

[0134] In one embodiment, the arc-isolating element 29 is made of a gas-generating material. For example, the arc-isolating element 29 can be made of melamine. The gas produced by the arc-isolating element 29, made of a gas-generating material, helps to extinguish the arc, thereby accelerating the arc-extinguishing efficiency.

[0135] In one embodiment, the first arc-blocking segment 291 extends into the first arc-extinguishing chamber 21.

[0136] In one embodiment, the second arc-blocking segment 292 extends into the second arc-extinguishing chamber 22.

[0137] In one embodiment, the third arc-blocking segment 293 extends into the second arc-extinguishing chamber 22.

[0138] In one embodiment, the third arc-isolating segment 293 extends from the second arc-isolating segment 292 toward the third end 221 and the fourth end 222 of the second arc-extinguishing chamber 22, thereby electrically isolating the second arc-extinguishing chamber 22 from a portion of the first arc-guiding member 23, and from a portion of the arc-initiating device 3. Specifically, the third arc-isolating segment 293 is configured to electrically isolate the portions of the second arc-extinguishing chamber 22 and the first arc-guiding member 23 that are directly opposite the second arc-extinguishing chamber 22 along the first direction X, such as the first connecting segment 234, preventing the arc from jumping directly from the first connecting segment 234 along the first direction X to the grid plate of the second arc-extinguishing chamber 22. Similarly, the configuration of another portion of the third arc-isolating segment 293 electrically isolates the portions of the second arc-extinguishing chamber 22 and the first arc-initiating member 31 that are directly opposite the second arc-extinguishing chamber 22 along the first direction X, preventing the arc from jumping directly from the portion of the first arc-initiating member 31 that is directly opposite the second arc-extinguishing chamber 22 along the first direction X to the grid plate of the second arc-extinguishing chamber 22.

[0139] Furthermore, the third arc-blocking segment 293 has a fishtail-shaped structure, with one part of the two outwardly protruding parts of the fishtail-shaped structure located between the second arc-extinguishing chamber 22 and the first arc-guiding component 23, and the other part located between the second arc-extinguishing chamber 22 and the arc-initiating device 3.

[0140] Figure 10 yes Figure 3 The diagram shows the structure of the first and second arc-extinguishing chambers in the arc-extinguishing system. Figure 11 yes Figure 10 A schematic diagram of the structure of the first grid plate in the first arc-extinguishing chamber.

[0141] Please see Figure 10 and Figure 11 In some embodiments, the first arc-extinguishing chamber 21 includes a plurality of stacked first grid plates 213. Each first grid plate 213 includes a first body 214 and two first extensions 215. The first extensions 215 extend from the first body 214 toward the side away from the second arc-extinguishing chamber 22. The two first extensions 215 are arranged opposite to each other and cooperate with two first arc-blocking segments 291 respectively to form a magnetic field that causes the electric arc to move toward the first arc-extinguishing chamber 21.

[0142] It should be noted that the relative directions of the two first arc-separating segments 291 are the same as the relative directions of the two first extensions 215. Therefore, the first extension 215 on one side of the plurality of first grid plates 213 is inserted into the first arc-separating segment 291 on the same side, and the first extension 215 on the other side of the plurality of first grid plates 213 is inserted into the first arc-separating segment 291 on the same side.

[0143] The two first extensions 215 can generate a magnetic field when the electric arc is generated. The magnetic field has a magnetic blowing effect on the electric arc, which causes the electric arc to move through the narrow slit 294 into the first arc extinguishing chamber 21. Therefore, the arrangement of the first extensions 215 accelerates the movement speed of the electric arc and shortens the arc extinguishing time.

[0144] In one embodiment, the first extension 215 extends from the first body 214 in the direction from the second arc-extinguishing region 12 to the first arc-extinguishing region 11, and the relative directions of the two first extensions 215 are perpendicular to the first direction X. That is, the relative directions of the two first arc-blocking segments 291 and the relative directions of the two first extensions 215 are both parallel to the second direction Y.

[0145] In one embodiment, both the first body 214 and the first extension 215 are plate-shaped structures, and the surfaces of the first body 214 and the first extension 215 are arranged parallel to the first direction X and also parallel to the second direction Y.

[0146] In one embodiment, a first receiving portion 295 is formed on the side of the first arc segment 291 opposite to the narrow slit 294, and the first receiving portion 295 is used to receive the first extension 215.

[0147] It should be noted that the first body 214 of the first grid plate 213 plays the role of arc extinguishing, while the first extension 215 only plays the role of magnetic blowing. Therefore, the area of ​​the first body 214 must be larger than the area of ​​the first extension 215.

[0148] The first receiving portion 295 is formed on the side of the first arc-blocking segment 291 away from the narrow slit 294. The two first extension portions 215 are still insulated from each other by the first arc-blocking segment 291. Therefore, the electric arc will not jump into the first extension portion 215 during the movement, but will move directly to the first body 214 of the first grid plate 213 along the narrow slit 294, and will be cut by the larger first body 214.

[0149] In one embodiment, a first groove 216 is formed on the side of the first body 214 near the first extension 215, extending away from the first extension 215 and opposite to the narrow slit 294. The presence of the first groove 216 helps to elongate the electric arc and facilitates arc extinguishing.

[0150] Furthermore, the first groove 216 is an inclined groove. Two adjacent first grid plates 213 are flipped. In this way, two inclined grooves with opposite inclination directions are alternately arranged, and the electric arc travels with the inclined groove, thus being elongated, which facilitates arc extinguishing.

[0151] Figure 12 yes Figure 10 A schematic diagram of the structure of the third grid plate in the second arc-extinguishing chamber.

[0152] Please see Figure 12 In some embodiments, the second arc-extinguishing chamber 22 includes a plurality of stacked second grid plates 223 and third grid plates 224. The plurality of second grid plates 223 are located in the middle of the second arc-extinguishing chamber 22, and the plurality of third grid plates 224 are located on both sides of the second grid plates 223. The second grid plate 223 includes a second body 225 and two second extensions 226. The two second extensions 226 extend from the second body 225 toward the contact system 9. The two second extensions 226 are arranged opposite to each other and cooperate with the two arc-blocking members 29 respectively to form a magnetic field that causes the arc to move toward the second arc-extinguishing chamber 22.

[0153] It should be noted that the relative directions of the two arc-blocking members 29 are the same as the relative directions of the two second extensions 226. Therefore, the second extension 226 on one side of the plurality of second grid plates 223 is inserted and engaged with the arc-blocking member 29 on the same side, and the second extension 226 on the other side of the plurality of second grid plates 223 is inserted and engaged with the arc-blocking member 29 on the same side.

[0154] Specifically, the grid plates of the second arc-extinguishing chamber 22 are arranged in the following order: multiple third grid plates 224, multiple second grid plates 223, and multiple third grid plates 224. The second grid plate 223 with a second extension 226 is located in the center to avoid interference between the second extension 226 and any of the first arc-guiding member 23, the first arc-extinguishing chamber 21, and the arc-initiating device 3.

[0155] The two second extensions 226 can generate a magnetic field when the electric arc is generated. The magnetic field exerts a magnetic blowing effect on the electric arc, causing the electric arc to move through the narrow slit 294 into the second arc-extinguishing chamber 22. Therefore, the arrangement of the second extensions 226 accelerates the movement speed of the electric arc and shortens the arc-extinguishing time.

[0156] In one embodiment, the second extension 226 extends from the second body 225 in the direction from the second arc-extinguishing zone 12 to the first arc-extinguishing zone 11, and the relative directions of the two second extensions 226 are perpendicular to the first direction X, that is, the relative directions of the two second extensions 226 and the relative directions of the two arc-blocking members 29 are parallel to the second direction Y.

[0157] In one embodiment, the second body 225 and the second extension 226 are both plate-shaped structures, and the surfaces of the second body 225 and the second extension 226 are parallel to the first direction X and also parallel to the second direction Y.

[0158] In one embodiment, the second extension 226 extends into the second arc-blocking segment 292 and the third arc-blocking segment 293, that is, into the first arc-extinguishing region 11. The longer the second extension 226 is, the stronger the magnetic blow-out effect and the faster the arc extinguishing.

[0159] Furthermore, the second diaphragm segment 292 and the third diaphragm segment 293 together form a second receiving portion 296 for accommodating the second extension 226. The second receiving portion 296 is formed on the side of the second diaphragm segment 292 and the third diaphragm segment 293 opposite to the narrow slit 294.

[0160] It should be noted that the second body 225 of the second grid plate 223 serves to extinguish the arc, while the second extension 226 only serves to blow the magnetic force. Therefore, the area of ​​the second body 225 must be larger than the area of ​​the second extension 226.

[0161] The second receiving portion 296 is formed on the side of the arc-blocking member 29 away from the narrow slit 294. The two second extension portions 226 are still insulated from each other by the blocking of the second arc-blocking segment 292 and the third arc-blocking segment 293. Therefore, the electric arc will not jump into the second extension portion 226 during the movement, but will move directly into the second body 225 of the second grid plate 223 along the narrow slit 294, and will be cut by the second body 225 with a larger area.

[0162] In one embodiment, a second groove is formed on the side of the second body 225 near the second extension 226, extending in a direction away from the second extension 226 and opposite to the narrow slit 294. The presence of the second groove helps to elongate the electric arc and facilitates arc extinguishing.

[0163] Furthermore, the second groove is an inclined groove. Two adjacent second grid plates 223 are flipped. In this way, two inclined grooves with opposite inclination directions are alternately arranged, and the electric arc travels with the inclined groove, thus being elongated, which facilitates arc extinguishing.

[0164] In one embodiment, a third groove 227 is formed on the side of the third grid plate 224 near the first arc-extinguishing region 11, and the third groove 227 is opposite to the narrow slit 294. The presence of the third groove 227 is beneficial for elongating the arc and facilitating arc extinguishing.

[0165] Furthermore, the third groove 227 is an inclined groove. Two adjacent third grid plates 224 are flipped. In this way, two inclined grooves with opposite inclination directions are alternately arranged, and the electric arc travels with the inclined groove, thus being elongated, which facilitates arc extinguishing.

[0166] Please seeFigure 2 In some embodiments, the arc-starting device 3 includes a first arc-starting element 31 and a second arc-starting element 32. One end of the first arc-starting element 31 is connected to the first contact 91, and the other end of the first arc-starting element 31 is stacked with the fourth end 222 of the second arc-extinguishing chamber 22. One end of the second arc-starting element 32 can be electrically connected to the second contact 92, and the other end of the second arc-starting element 32 is stacked with the first end 211 of the first arc-extinguishing chamber 21.

[0167] The first arc-initiating element 31 is connected to the first contact 91 and is stacked on top of the fourth end 222 of the second arc-extinguishing chamber 22. This allows the arc to be introduced into the second arc-extinguishing chamber 22 for arc extinguishing during the arc-extinguishing stage. The stacking of the first arc-initiating element 31 and the fourth end 222 of the second arc-extinguishing chamber 22, i.e., the spaced arrangement, increases the arc voltage drop in the second arc-extinguishing chamber 22, which is beneficial for arc extinguishing. Similarly, the second contact 92 is electrically connected to the second arc-initiating element 32 after rotation. The second arc-initiating element 32 introduces the arc into the first arc-extinguishing chamber 21 for arc extinguishing. The stacking of the second arc-initiating element 32 on the first end 211 of the first arc-extinguishing chamber 21 increases the arc voltage drop in the first arc-extinguishing chamber 21, which is also beneficial for arc extinguishing.

[0168] In one embodiment, one end of the first arc-initiating member 31 is threadedly connected to the first contact 91. Of course, welding or other methods can also be used, and this application does not impose further limitations on this.

[0169] In one embodiment, the first arc-initiating element 31 includes a first arc-initiating portion 313, a connecting portion 314, and a second arc-initiating portion 315 connected in sequence. The first arc-initiating portion 313 is connected to the first contact 91, and the second arc-initiating portion 315 is stacked on top of the fourth end 222 of the second arc-extinguishing chamber 22. The first arc-initiating element 31 includes a third surface and a fourth surface facing away from each other, wherein the third surface faces the second arc-extinguishing chamber 22 and the first arc-extinguishing chamber 21. The second arc-initiating portion 315 and the connecting portion 314 are bent toward the third surface, and the connecting portion 314 and the first arc-initiating portion 313 are bent toward the fourth surface.

[0170] Furthermore, the first arc-inducing portion 313 and the second arc-inducing portion 315 are parallel to each other. The angle formed by the second arc-inducing portion 315 and the connecting portion 314 bending towards the third surface is an obtuse angle, and the angle formed by the connecting portion 314 and the first arc-inducing portion 313 bending towards the fourth surface is also an obtuse angle. The connecting portion 314 extends from the second arc-inducing portion 315 away from the second arc-extinguishing chamber 22 to the first arc-inducing portion 313. In this way, the second arc-inducing portion 315 and the second arc-extinguishing chamber 22 are stacked, and the connecting portion 314 extends away from the fourth end 222 of the second arc-extinguishing chamber 22 and close to the second grid plate 223. A receiving space is formed between the connecting portion 314 and the second arc-extinguishing chamber 22, and a portion of the third arc-blocking segment 293 is located in this receiving space, so that the connecting portion 314 and the third grid plate 224 are insulated from each other.

[0171] It should be noted that although there is a narrow gap 294 between the two third arc-isolating segments 293, the position corresponding to the narrow gap 294 in the third grid plate 224 is the third groove 227. The third groove 227 makes the distance between the third grid plate 224 and the connecting part 314 greater, which can prevent the arc root from jumping directly from the connecting part 314 to the third grid plate 224 located above the fourth end 222. Similarly, the same applies between the second arc-extinguishing chamber 22 and the first arc-guiding member 23. The arrangement of another part of the third arc-isolating segment 293 can make the second arc-extinguishing chamber 22 and the first connecting segment 234 almost electrically isolated.

[0172] In one embodiment, the distance between the third grid plate 224 and the connecting portion 314 is 3-5 mm. Within this distance range, the arc is more likely to enter the second arc-extinguishing chamber 22 from the first arc-initiating element 31 for arc extinguishing, and the arc will almost never jump directly from the connecting portion 314 to the third grid plate 224.

[0173] In one embodiment, the distance between the third grid plate 224 and the first connecting section 234 is 3-5 mm. Within this distance range, the arc is more likely to enter the second arc-extinguishing chamber 22 from the first arc-guiding member 23 for arc extinguishing, and the arc will almost never jump directly from the first connecting section 234 to the third grid plate 224.

[0174] It should be noted that this application may also omit the first arc-initiating element 31, and instead, by setting the shape of the second arc-extinguishing chamber 22 so that the fourth end 222 of the second arc-extinguishing chamber 22 is closer to the first contact 91, the arc breaks down the air between the two during the arc-extinguishing stage, thus making them electrically connected.

[0175] In one embodiment, the second arc-initiating element 32 includes a potential switching piece, which includes a switching part 323 and a first guiding part 324. When the second contact 92 is rotated to the maximum angle, there is a gap between the switching part 323 and the second contact 92. The switching part 323 is used to introduce the arc of the second contact 92 into itself. The first guiding part 324 is stacked with the first end 211 of the first arc-extinguishing chamber 21 to introduce the arc into the first arc-extinguishing chamber 21.

[0176] In another embodiment, the second arc-inducing member 32 includes a second guide portion and a third guide portion. When the second contact 92 is rotated to the maximum angle, the second guide portion contacts the second contact 92 to introduce the electric arc of the second contact 92 into itself. The third guide portion is stacked with the first end 211 of the first arc-extinguishing chamber 21 to introduce the electric arc into the first arc-extinguishing chamber 21.

[0177] It should be noted that this application may also omit the second arc-initiating element 32. By setting the shape of the first arc-extinguishing chamber 21 so that the first end 211 of the first arc-extinguishing chamber 21 is closer to the second contact 92, the arc breaks down the air between the two during the arc-extinguishing stage, thus making them electrically connected.

[0178] Figure 13 yes Figure 3 The diagram shows the assembled structure of the arc extinguishing system.

[0179] Please see Figure 13 In some embodiments, the housing 1 includes a first side plate 131 and a second side plate 132, which are disposed opposite to each other to form a receiving cavity. The first side plate 131 and the second side plate 132 are respectively provided with a plurality of mounting holes 133 for mounting the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, the first arc-guiding member 23, the arc-isolating member 29, and the second insulating member 28.

[0180] In one embodiment, the first side plate 131 and the second side plate 132 are disposed opposite each other along a second direction Y, which is perpendicular to the first direction X. Further, two arc-blocking members 29 are disposed opposite each other along the second direction Y, two first extensions 215 are disposed opposite each other along the second direction Y, and two second extensions 226 are disposed opposite each other along the second direction Y.

[0181] This application provides a circuit breaker, including the arc extinguishing system of the circuit breaker described above.

[0182] Example 2

[0183] The difference between this embodiment and embodiment 1 is that the arc extinguishing system further includes a third arc extinguishing chamber and a second arc guiding member. The third arc extinguishing chamber is located in the first arc extinguishing zone 11. The first arc extinguishing chamber 21 and the third arc extinguishing chamber are arranged in the direction from the first end 211 to the second end 212. The third arc extinguishing chamber includes a fifth end and a sixth end that are opposite to each other in the stacking direction. The fifth end is located between the sixth end and the second end. The fifth end can be electrically connected to the fourth end 222 through the second arc guiding member. The sixth end can be electrically connected to the first contact 91 through the arc ignition device 3. The projections of the second arc extinguishing chamber 22 and the third arc extinguishing chamber on the first plane along the first direction X overlap.

[0184] In one embodiment, the sixth end extends beyond the fourth end of the second arc-extinguishing chamber 22 in the direction from the fifth end to the sixth end.

[0185] In one embodiment, the stacking directions of the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber are all set along the third direction Z. Of course, the angles formed by the stacking directions of the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber with the first direction X can also be other angles, such as 80°-100°, meaning the stacking directions of the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber can be different. The angles formed by the stacking directions of the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber with the first direction X must satisfy the requirement that the arc can be cut by both of them.

[0186] This arrangement not only ensures that the arc generated by the first contact 91 and the second contact 92 during disconnection can be cut by the three arc-extinguishing chambers—the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber—significantly improving the breaking capacity of the arc-extinguishing system, but also saves space by staggering the arrangement of the first, second, and third arc-extinguishing chambers, thus adapting to situations where the circuit breaker space is limited. Therefore, the arc-extinguishing system of the circuit breaker provided in this embodiment arranges as many arc-extinguishing chambers as possible in a relatively small space, greatly increasing the number of arc-extinguishing chamber plates, significantly improving the arc voltage drop, and enhancing the breaking capacity of the circuit breaker.

[0187] Example 3

[0188] Figure 14 This is another structural schematic diagram of the circuit breaker according to an embodiment of this application.

[0189] Please see Figure 14 In some alternative embodiments, the second arc-extinguishing chamber 22 extends beyond the first arc-extinguishing chamber 21 in the direction in which the first contact 91 points to the second contact 92.

[0190] Alternatively, the first arc-extinguishing chamber 21 may extend beyond the second arc-extinguishing chamber 22 in the direction from the second contact 92 to the first contact 91.

[0191] In some alternative embodiments, the first arc-extinguishing chamber 21 has a first end and a second end arranged in the direction from the first contact 91 to the second contact 92, and the second arc-extinguishing chamber 22 has a third end and a fourth end arranged in the direction from the first contact 91 to the second contact 92.

[0192] The first arc guide component 23 includes a first arc guide segment 2310, a first bend segment 2320, and a second arc guide segment 2330 connected in sequence. The first arc guide segment 2310 is stacked with the second end of the first arc extinguishing chamber 21, and the second arc guide segment 2330 is stacked with the third end of the second arc extinguishing chamber 22.

[0193] Optionally, the first arc guide 23 is made of conductive metal material.

[0194] Optionally, the angle between the first guide arc segment 2310 and the first curved segment 2320 is an obtuse angle, and the angle between the first curved segment 2320 and the second guide arc segment 2330 is an obtuse angle.

[0195] A first arc guide 23 is provided, which is divided into a first arc guide segment 2310, a first bending segment 2320, and a second arc guide segment 2330. The first arc guide segment 2310 is stacked with the second end of the first arc extinguishing chamber 21, and the second arc guide segment 2330 is stacked with the third end of the second arc extinguishing chamber 22. The first arc guide 23 not only guides the electric arc itself and introduces the electric arc into the second arc extinguishing chamber 22, but also extends into the first arc extinguishing area 11 and the second arc extinguishing area 12 and is made of magnetic material. It can provide a magnetic blowing effect for the electric arc generated by the contact system 9, that is, blow the electric arc away from the second arc extinguishing chamber 22 away from the contact system 9 and then cut it. Therefore, the first arc guide 23 provides a dual function for the electric arc to enter the second arc extinguishing chamber 22.

[0196] Optionally, the first arc guide segment 2310 includes a first straight segment 2340, a first curved segment 2350, and a second straight segment 2360 connected in sequence. The first straight segment 2340 is stacked with the second end of the first arc extinguishing chamber 21, the second straight segment 2360 is connected to the first curved segment 2320, and the first curved segment 2350 is connected to the ends of the first straight segment 2340 and the second straight segment 2360 near the contact system 9.

[0197] Furthermore, the second straight segment 2360, the first straight segment 2340, and the second guide arc segment 2330 are all set in parallel, and the central angle corresponding to the first curved segment 2350 is 180°.

[0198] In some alternative embodiments, the first guide arc segment 2310 comprises only a straight line segment. Further optionally, this straight line segment is parallel to the second guide arc segment 2330.

[0199] In some alternative embodiments, the projections of the first contact 91 and the second contact 92 along the first direction X onto the first plane cover the projections of the second end of the first arc-extinguishing chamber 21 and the first arc-guiding segment 2310 along the first direction X onto the first plane, wherein the first plane is perpendicular to the first direction X.

[0200] In some alternative embodiments, the projections of the first contact 91 and the second contact 92 along the first direction X onto the housing 1 only cover the projection of the first arc segment 2310 along the first direction X onto the first plane.

[0201] The projections of the first contact 91 and the second contact 92 along the first direction X onto the first plane are configured to cover the projections of the first arc-conducting segment 2310 along the first direction X onto the first plane. When the internal space of the circuit breaker is relatively compact, this configuration ensures that when the first contact 91 and the second contact 92 are just separated, an arc is generated between the first contact 91, the arc-initiating device 3, the first arc-extinguishing chamber 21, the first arc-conducting segment 2310, and the second contact 92. That is, when the first contact 91 and the second contact 92 are just separated, the arc can be introduced into the first arc-extinguishing chamber 21 and cut off, thereby improving the arc-extinguishing capability of the arc-extinguishing system.

[0202] In some alternative embodiments, the first arc guide 23 is a wire, one end of which is connected to the second end of the first arc extinguishing chamber 21, and the other end is connected to the third end of the second arc extinguishing chamber 22.

[0203] Using wires for connection saves space and is low in cost.

[0204] In some optional embodiments, the arc-extinguishing device 2 further includes a third arc-extinguishing chamber 24 and a second arc-guiding element 25. The third arc-extinguishing chamber 24 is disposed in the first arc-extinguishing zone 11 and is arranged with the first arc-extinguishing chamber 21 in the direction from the first contact 91 to the second contact 92, and there is a first gap between them to form a first exhaust channel from the first gap, through the second arc-extinguishing chamber 22 to the exhaust port 10. The third arc-extinguishing chamber 24 and the second arc-extinguishing chamber 22 overlap in their orthographic projections on the first plane along the first direction X, and they can be arc-connected by the second arc-guiding element 25. The arc-initiating device 3 is used to introduce the arc current into the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22 and the third arc-extinguishing chamber 24 in the direction from the first contact 91 to the second contact 92.

[0205] Optionally, the first arc-extinguishing chamber 21 and the third arc-extinguishing chamber 24 are arranged sequentially along the third direction Z. That is, the stacking direction of the first arc-extinguishing chamber 21 and the stacking direction of the third arc-extinguishing chamber 24 are the same, both along the third direction Z. Furthermore, the first arc-extinguishing chamber 21 and the third arc-extinguishing chamber 24 have the same dimensions.

[0206] It should be noted that the stacking direction of the first arc-extinguishing chamber 21 and the stacking direction of the third arc-extinguishing chamber 24 may not be the same, but the requirement that the arc can be cut by the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22 and the third arc-extinguishing chamber 24 must be met. For example, the angle between the stacking direction of the first arc-extinguishing chamber 21 and the stacking direction of the third arc-extinguishing chamber 24 is 0°-15°.

[0207] Optionally, the third arc-extinguishing chamber 24 extends beyond the second arc-extinguishing chamber 22 in the direction from the first contact 91 to the second contact 92. Alternatively, the projection of the second arc-extinguishing chamber 22 along the first direction X onto the first plane may also overlap the projection of the third arc-extinguishing chamber 24 along the first direction X onto the first plane.

[0208] A third arc-extinguishing chamber 24 is provided, and the first and third arc-extinguishing chambers 21 and 24 are arranged along the direction from the first contact 91 to the second contact 92. The second arc-extinguishing chamber 22 is staggered with the first arc-extinguishing chamber 21 along the first direction X, and the second and third arc-extinguishing chambers 22 are also staggered with the third arc-extinguishing chamber 24 along the first direction X. This arrangement not only allows the arc generated when the first and second contacts 91 and 92 are disconnected to be cut by the three arc-extinguishing chambers 21, 22, and 24, greatly improving the breaking capacity of the arc-extinguishing system, but also saves space by staggering the three arc-extinguishing chambers 21, 22, and 24, thus adapting to situations where the circuit breaker space is limited. Therefore, the arc-extinguishing system of the circuit breaker provided in this embodiment arranges as many arc-extinguishing chambers as possible in a small space, greatly increasing the number of arc-extinguishing chamber grids, significantly improving the arc voltage drop, and enhancing the breaking capacity of the circuit breaker.

[0209] Furthermore, the second arc-extinguishing chamber 22 is staggered with the first arc-extinguishing chamber 21 along the first direction X, and the second arc-extinguishing chamber 22 is also staggered with the third arc-extinguishing chamber 24 along the first direction X. Therefore, the distance between the first arc-extinguishing chamber 21 and the third arc-extinguishing chamber 24 along the third direction Z must be less than the length of the second arc-extinguishing chamber 22 along the third direction Z. Thus, the electric arc is gradually lengthened as it enters the second arc-extinguishing chamber 22 from the first arc-guided member 23 and the second arc-guided member 25, which is beneficial for the arc to be cut.

[0210] Optionally, the first arc-extinguishing chamber 21 and the third arc-extinguishing chamber 24 are arranged sequentially along the third direction Z, and the distance between the third arc-extinguishing chamber 24 and the contact system 9 is greater than the distance between the first arc-extinguishing chamber 21 and the contact system 9. This arrangement ensures that when the first contact 91 and the second contact 92 are just broken, the arc first enters the first arc-extinguishing chamber 21 via the first arc-guiding element 23 and is cut off.

[0211] In some alternative embodiments, the second arc guide 25 includes a third arc guide segment 251, a second bend segment 252 and a fourth arc guide segment 253 connected in sequence, and the second arc extinguishing chamber 22 has a third end and a fourth end arranged in the direction from the first contact 91 to the second contact 92. The third arc guide segment 251 is stacked with the end of the third arc extinguishing chamber 24 near the first arc extinguishing chamber 21, and the fourth arc guide segment 253 is stacked with the fourth end of the second arc extinguishing chamber 22.

[0212] Optionally, the second arc guide 25 is made of a metallic conductive material.

[0213] Optionally, the angle between the third guide arc segment 251 and the second bend segment 252 is an obtuse angle, and the angle between the second bend segment 252 and the fourth guide arc segment 253 is an obtuse angle.

[0214] A second arc guide 25 is provided, which is divided into a third arc guide segment 251, a second bending segment 252, and a fourth arc guide segment 253. The third arc guide segment 251 is stacked with the end of the third arc-extinguishing chamber 24 near the first arc-extinguishing chamber 21, and the fourth arc guide segment 253 is stacked with the fourth end of the second arc-extinguishing chamber 22. That is, the second arc guide 25 not only guides the electric arc itself and introduces the electric arc into the second arc-extinguishing chamber 22, but also extends into the first arc-extinguishing area 11 and the second arc-extinguishing area 12 and is made of magnetic material. It can provide a magnetic blowing effect for the electric arc generated by the contact system 9, that is, blow the electric arc away from the second arc-extinguishing chamber 22 away from the contact system 9 and then cut it. Therefore, the second arc guide 25 provides a dual function for the electric arc to enter the second arc-extinguishing chamber 22.

[0215] Optionally, the third arc-guided segment 251 includes a third straight segment 254, a second curved segment 255, and a fourth straight segment 256 connected in sequence. The third straight segment 254 is stacked with the end of the third arc-extinguishing chamber 24 near the first arc-extinguishing chamber 21. The fourth straight segment 256 is connected to the second curved segment 252. The second curved segment 255 is connected to the ends of the third straight segment 254 and the fourth straight segment 256 near the contact system 9.

[0216] Furthermore, the third straight segment 254, the fourth straight segment 256, and the fourth guide arc segment 253 are all set in parallel, and the central angle corresponding to the second curved segment 255 is 180°.

[0217] In some alternative embodiments, the third guide segment 251 comprises only a straight line segment. Furthermore, this straight line segment is parallel to the fourth guide segment 253.

[0218] Optionally, when the first arc guide segment 2310 includes a first straight segment 2340, a first curved segment 2350, and a second straight segment 2360 connected in sequence, and the third arc guide segment 251 includes a third straight segment 254, a second curved segment 255, and a fourth straight segment 256 connected in sequence, the first arc guide element 23 and the second arc guide element 25 are symmetrically arranged along a first plane parallel to the first direction X. This arrangement simplifies manufacturing, requiring only the fabrication of one type of arc guide element. Furthermore, it facilitates the layout of other arc-extinguishing chambers and other components.

[0219] It should be noted that the first arc guide 23 and the second arc guide 25 have a gap along the first direction X to form the first exhaust channel described above, which passes through the second arc-extinguishing chamber 22 to the exhaust port 10. When the electric arc is cut, high-temperature gas is generated. The high-temperature gas moves from the area of ​​high pressure to the area of ​​low pressure. Therefore, when the electric arc is cut, the high-temperature gas is discharged through the first exhaust channel.

[0220] In some alternative embodiments, the second arc guide 25 is a wire, with one end connected to the end of the third arc-extinguishing chamber 24 near the first arc-extinguishing chamber 21, and the other end connected to the fourth end of the second arc-extinguishing chamber 22. Using a wire to connect the third arc-extinguishing chamber 24 and the second arc-extinguishing chamber 22 saves space and reduces costs.

[0221] In some alternative embodiments, the contact system 9 has a conducting state and a disconnected state capable of generating an electric arc. The arc-initiating device 3 includes a first arc-initiating element 31 and a second arc-initiating element 32. The first arc-initiating element 31 is electrically connected to the first contact 91, and the second arc-initiating element 32 is used to electrically connect to the second contact 92 in the disconnected state and introduce the electric arc into the second arc-extinguishing chamber 22. The first arc-initiating element 31 is used to introduce the electric arc into the first arc-extinguishing chamber 21.

[0222] Optionally, the first arc-initiating component 31 includes a first arc-initiating segment 311 and a first straight plate segment 312. The first arc-initiating segment 311 is electrically connected to the first contact 91, and the first straight plate segment 312 and the first end of the first arc-extinguishing chamber 21 are stacked together.

[0223] Alternatively, the first arc segment 311 and the first straight plate segment 312 are integrally formed.

[0224] Optionally, the angle between the first arc segment 311 and the first straight segment 312 is an obtuse angle.

[0225] Optionally, the first straight plate segment 312 is fixedly connected to the inner wall of the circuit breaker. The first arc-initiating element 31 introduces the electric arc into the first arc-extinguishing chamber 21 through the first straight plate segment 312, and the electric arc enters the second arc-extinguishing chamber 22 via the first arc-guiding element 23.

[0226] In some alternative embodiments, the first arc-inducing element 31 is a wire, with one end of the first arc-inducing element 31 connected to the first contact 91 and the other end connected to the first end of the first arc-extinguishing chamber 21.

[0227] In some alternative embodiments, the second arc-initiating element 32 includes a second arc-initiating segment 321 and a second straight plate segment 322. The second contact 92 is capable of abutting against the second arc-initiating segment 321 in the broken state. The second straight plate segment 322 is stacked with the end of the third arc-extinguishing chamber 24 away from the first arc-extinguishing chamber 21.

[0228] Optionally, the angle between the second arc segment 321 and the second straight segment 322 is an obtuse angle.

[0229] Optionally, the second arc segment 321 and the second straight segment 322 are integrally formed.

[0230] Optionally, the second arc-leading segment 321 and the second straight segment 322 are fixed inside the circuit breaker. The second straight segment 322 is stacked with the end of the third arc-extinguishing chamber 24 away from the first arc-extinguishing chamber 21, so as to introduce the electric arc into the third arc-extinguishing chamber 24. The electric arc enters the second arc-extinguishing chamber 22 via the second arc-guiding member 25.

[0231] Figure 15 yes Figure 14 The diagram shows the structure of the arc-extinguishing system of the circuit breaker. Figure 16 yes Figure 15 A schematic diagram of the explosive structure of the arc extinguishing system.

[0232] Please see Figure 15 and Figure 16 In some alternative embodiments, the housing 1 includes a first arc-blocking wall 15 and a second arc-blocking wall 16, the first arc-blocking wall 15 and the second arc-blocking wall 16 being disposed opposite each other along a second direction Y, wherein the second direction Y is perpendicular to the first direction X.

[0233] Optionally, the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber 24 are fixed between the first arc-isolating wall 15 and the second arc-isolating wall 16. Further optionally, the first arc-isolating wall 15 and the second arc-isolating wall 16 are each provided with multiple through holes, and multiple grid plates of the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber 24 all extend into the through holes of the first arc-isolating wall 15 and the second arc-isolating wall 16 along the second direction Y. That is, the first arc-isolating wall 15 and the second arc-isolating wall 16 serve to install and fix the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber 24.

[0234] In some alternative embodiments, the arc extinguishing system further includes a first arc blowing device located between the first arc-isolating wall 15 and the second arc-isolating wall 16. The first arc blowing device includes a first isolation plate 51 and a second isolation plate 52. The first isolation plate 51 and the second isolation plate 52 are arranged opposite to each other in the direction from the first contact 91 to the second contact 92. The first isolation plate 51 is located in at least one of the first arc extinguishing zone 11 and the second arc extinguishing zone 12, and the second isolation plate 52 is located in at least one of the first arc extinguishing zone 11 and the second arc extinguishing zone 12.

[0235] Using two arc-blowing components greatly enhances the arc-blowing capability compared to using a single component.

[0236] Optionally, both the first isolation plate 51 and the second isolation plate 52 are located in the first arc-extinguishing zone 11 and the second arc-extinguishing zone 12. This arrangement ensures that the arc-extinguishing range of the first isolation plate 51 and the second isolation plate 52 covers the first arc-extinguishing zone 11 and the second arc-extinguishing zone 12, thereby allowing the arc to be blown as far away from the second arc-extinguishing chamber 22 as possible, and then cut by the second arc-extinguishing chamber 22.

[0237] Optionally, the first isolation plate 51 and the second isolation plate 52 each include a magnetic conductive plate and an insulating material wrapped around the outer periphery of the magnetic conductive plate. Further optionally, the magnetic conductive plate is a silicon steel sheet.

[0238] Optionally, both the first isolation plate 51 and the second isolation plate 52 are gas-generating materials, such as melamine. Of course, other gas-generating materials can also be used, and this application does not impose further limitations here. Using gas-generating materials to provide a blowing effect for the electric arc is effective and reliable. Furthermore, the gas-generating material can also blow the high-temperature gas generated after the electric arc is cut, directing it towards the exhaust port 10.

[0239] Optionally, the first isolation plate 51 and the second isolation plate 52 respectively include a magnetic plate and a gas-generating material wrapped around the outer periphery of the magnetic plate. This configuration can provide two magnetic blowing effects for the electric arc, namely, arc blowing by the magnetic plate and arc blowing by the gas, greatly enhancing the magnetic blowing effect.

[0240] In some alternative embodiments, the first isolation plate 51 and the first arc guide 23 are connected, and the first arc guide 23 wraps around at least a portion of the outer peripheral surface of the first isolation plate 51. The second isolation plate 52 is connected to the second arc guide 25, and the second arc guide 25 wraps around at least a portion of the outer peripheral surface of the second isolation plate 52.

[0241] Specifically, the first arc guide 23 includes a first arc sub-segment 2310, a first curved segment 2320, and a second arc sub-segment 2330. The first arc guide segment 2310 includes a first straight segment 2340, a first curved segment 2350, and a second straight segment 2360 connected in sequence. The first straight segment 2340, the first curved segment 2350, the second straight segment 2360, the first curved segment 2320, and the second arc guide sub-segment 2330 are fixedly connected to the outer peripheral surface of the first isolation plate 51. Optionally, the first isolation plate 51 includes a first outer peripheral surface surrounding the second direction Y, and the first arc guide 23 at least partially wraps around the first outer peripheral surface.

[0242] The second arc guide 25 includes a third arc guide segment 251, a second curved segment 252, and a fourth arc guide segment 253. The third arc guide segment 251 includes a third straight segment 254, a second curved segment 255, and a fourth straight segment 256. The third straight segment 254, the second curved segment 255, the fourth straight segment 256, the second curved segment 252, and the fourth arc guide segment 253 are fixedly connected to the outer peripheral surface of the second isolation plate 52. Optionally, the second isolation plate 52 includes a second outer peripheral surface surrounding the second direction Y, and the second arc guide 25 at least partially covers the second outer peripheral surface.

[0243] The first arc guide 23 is wrapped around at least part of the outer peripheral surface of the first isolation plate 51, and the second arc guide 25 is wrapped around at least part of the outer peripheral surface of the second isolation plate 52. This arrangement not only improves the arc blowing effect, but also saves space and facilitates processing and manufacturing.

[0244] The first arc-guiding segment 2310 is configured to include a first straight segment 2340, a first curved segment 2350, and a second straight segment 2360. The third arc-guiding segment 251 is configured to include a third straight segment 254, a second curved segment 255, and a fourth straight segment 256. This configuration not only changes the direction of the arc current, providing a magnetic blow-out effect for the arcs in the first arc-extinguishing chamber 21 and the third arc-extinguishing chamber 24, but also allows the first curved segment 2350 to be close to the first contact 91 and the second contact 92, facilitating the introduction of the arc into itself when the first contact 91 and the second contact 92 have just broken. The second curved segment 255 is close to the second contact 92, allowing the arc to be introduced into itself during the breaking process of the first contact 91 and the second contact 92.

[0245] Optionally, the first isolation plate 51 has multiple first plug-in members 53 at both ends along the second direction Y, and the multiple first plug-in members 53 are plugged into and cooperate with the first arc-blocking wall 15 and the second arc-blocking wall 16. The second isolation plate 52 has multiple second plug-in members 54 at both ends along the second direction Y, and the second plug-in members 54 are plugged into and cooperate with the first arc-blocking wall 15 and the second arc-blocking wall 16. The first arc-guided member 23 is installed on the housing 1 through the first isolation plate 51, and the second arc-guided member 25 is installed on the housing 1 through the second isolation plate 52.

[0246] In some alternative embodiments, the first isolation plate 51 has a second gap with the inner wall of the circuit breaker to form a second exhaust channel from the first arc-extinguishing chamber 21 and the second gap to the exhaust port 10. The second isolation plate 52 has a third gap with the inner wall of the circuit breaker to form a third exhaust channel from the third arc-extinguishing chamber 24 and the third gap to the exhaust port 10.

[0247] The first exhaust channel, the second exhaust channel, and the third exhaust channel are formed, so that the high-temperature gas generated after the electric arc is cut can be discharged to the exhaust port 10 through the first exhaust channel, the second exhaust channel, and the third exhaust channel and then discharged.

[0248] In some alternative embodiments, the arc extinguishing system further includes a second arc blowing device, which includes a first arc blowing member 61 and a second arc blowing member 62 disposed opposite to each other along the second direction Y. The first arc blowing member 61 is fixed to the side of the first arc partition wall 15 facing the receiving cavity, and the second arc blowing member 62 is fixed to the side of the second arc partition wall 16 facing the receiving cavity.

[0249] Optionally, the first arc blowing component 61 and the second arc blowing component 62 are mirror-symmetrical.

[0250] Optionally, the first arc-blowing element 61 and the second arc-blowing element 62 are made of a gas-generating material, such as melamine. Of course, the first arc-blowing element 61 and the second arc-blowing element 62 can also be other structures capable of blowing an arc, such as a magnetic sheet.

[0251] By setting the first arc blowing element 61 and the second arc blowing element 62, the electric arc in the first arc extinguishing zone 11 is further blown towards the second arc extinguishing zone 12, so that the electric arc is cut by the second arc extinguishing chamber 22, thereby improving the magnetic blowing effect and improving the breaking capacity of the arc extinguishing system.

[0252] In some alternative embodiments, the exhaust port 10 is disposed opposite to the second arc-extinguishing chamber 22 in the first direction X.

[0253] Since a large part of the electric arc will be cut by the second arc-extinguishing chamber 22, the exhaust port 10 is set opposite to the second arc-extinguishing chamber 22. The gas generated after the electric arc is cut can be directly discharged through the exhaust port 10. Moreover, the exhaust port 10 is about equidistant from the second exhaust channel and the third exhaust channel after it is opposite to the second arc-extinguishing chamber 22, which can facilitate the discharge of gas from the second exhaust channel and the third exhaust channel at the same time.

[0254] In some alternative embodiments, the arc extinguishing system further includes a de-freezing plate 26, which is installed between the first arc-blocking wall 15 and the second arc-blocking wall 16.

[0255] Optionally, at least one of the second and third exhaust passages is equipped with a de-freezing plate 26.

[0256] By setting up the deionization plate 26, metal particles in the high-temperature gas can be adsorbed and the high-temperature gas can be further cooled.

[0257] Optionally, the exhaust port 10 is provided with an arc-blocking plate 14 and a zero-arc grid plate.

[0258] Figure 17 This is a schematic diagram of the arc current flow of a circuit breaker according to an embodiment of this application.

[0259] Please see Figure 17 , Figure 17 The direction of the arc current and the direction of the magnetic field generated by the arc current are shown, i.e., flowing sequentially from the inlet busbar 7 to the first contact 91, the first arc-initiating element 31, the first arc-extinguishing chamber 21, the first arc-guiding element 23, the second arc-extinguishing chamber 22, the second arc-guiding element 25, the third arc-extinguishing chamber 24, the second arc-initiating element 32, and the second contact 92, and finally flowing to the outlet busbar 8. According to Fleming's left-hand rule, at the locations of the first arc-extinguishing chamber 21, the third arc-extinguishing chamber 24, and the first exhaust channel, the magnetic field causes the arc to move towards the second arc-extinguishing zone 12. Furthermore, the first and second arc-blowing devices also cause the arc to move away from the contact system 9 along the first direction X.

[0260] Figure 18 This is a schematic diagram of the current flow and high-temperature gas diffusion of the circuit breaker in the early stage of breaking, according to an embodiment of this application. Figure 19 This is a schematic diagram of the current flow and high-temperature gas diffusion of the circuit breaker during the breaking phase according to an embodiment of this application.Figure 20 This is a schematic diagram of the current flow and high-temperature gas diffusion of the circuit breaker in the later stage of breaking, according to an embodiment of this application. Figure 21 This is a schematic diagram of the current flow and high-temperature gas diffusion of the circuit breaker in an embodiment of this application when it is fully disconnected.

[0261] Please see Figure 18 When the first contact 91 and the second contact 92 just break apart, that is, in the early stage of breaking apart, an electric arc is generated between the first contact 91 and the second contact 92. The opening angle between the first contact 91 and the second contact 92 is relatively small. The second contact 92 is close to the first arc guide member 23. The arc root on the first contact 91 is guided to the first arc ignition member 31 located on the lower side of the first arc extinguishing chamber 21. Therefore, an electric arc is formed between the first contact 91, the first arc ignition member 31, the first arc extinguishing chamber 21, the first arc guide member 23 and the second contact 92. The high-temperature gas flows to the exhaust port 10 through the first exhaust channel and the second exhaust channel.

[0262] Please see Figure 19 When the first contact 91 and the second contact 92 are further opened, that is, in the middle of the breaking, the second contact 92 moves to the vicinity of the second arc guide 25, and an electric arc is formed between the first arc ignition member 31, the first arc extinguishing chamber 21, the first arc guide 23, the second arc extinguishing chamber 22, the second arc guide 25 and the second contact 92. The electric arc between the first arc guide 23 and the second arc guide 25 is guided and elongated until it enters the second arc extinguishing chamber 22 and is cut. Most of the high-temperature gas flows to the exhaust port 10 through the first exhaust channel and the second exhaust channel, and a small part of the high-temperature gas flows to the exhaust port 10 through the third exhaust channel.

[0263] Please see Figure 20 When the second contact 92 continues to open, that is, in the later stage of the breaking process, some of the grid plates of the third arc-extinguishing chamber 24 begin to cut the arc, while the arc between the first arc-guiding element 23 and the second arc-guiding element 25 enters the second arc-extinguishing chamber 22 and is cut, thus further increasing the arc sustaining voltage.

[0264] like Figure 21As shown, when the second contact 92 is opened to its maximum position, i.e., completely disconnected, the arc root on the second contact 92 transfers to the second arc-initiating element 32. An electric arc is generated between the first arc-initiating element 31, the first arc-extinguishing chamber 21, the first arc-guiding element 23, the second arc-extinguishing chamber 22, the second arc-guiding element 25, the third arc-extinguishing chamber 24, the second arc-initiating element 32, and the second contact 92. The electric arc is cut by all the grid plates of the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber 24. The electric arc includes an upper arc formed between the second arc-guiding element 25 and the second arc-initiating element 32 and moving along the stacked arrangement of the third arc-extinguishing chamber 24; a middle arc formed between the first arc-guiding element 23 and the second arc-guiding element 25 and moving along the stacked arrangement of the second arc-extinguishing chamber 22; and a lower arc formed between the first arc-guiding element 23 and the first arc-initiating element 31 and moving along the stacked arrangement of the first arc-extinguishing chamber 21. The second arc-guiding element 25 and the second arc-initiating element 32 constitute the two electrodes of the upper arc, the first arc-guiding element 23 and the second arc-guiding element 25 constitute the two electrodes of the middle arc, and the first arc-guiding element 23 and the first arc-initiating element 31 constitute the two electrodes of the lower arc. The arc is stretched and cooled to the maximum extent.

[0265] In some alternative embodiments, the stacking direction of the grid plates in the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber 24 is perpendicular to the direction of arc movement. This maximizes the arc-cutting effect.

[0266] The arc extinguishing system provided in this application embodiment arranges three arc extinguishing chambers in a limited arc extinguishing space, forming a series connection between them. This greatly increases the number of grid plates, improves the voltage required to maintain arcing, enhances the breaking capacity, and meets the requirements for AC and DC high voltage applications.

[0267] When applied to AC / DC systems, the arc extinguishing system of this application embodiment has a high breaking capacity, especially the breaking capacity at high voltage levels.

[0268] The arc-initiating device 3, the first arc-guiding element 23, and the second arc-guiding element 25 of the embodiments of this application improve the situation where the arc is difficult to enter the arc-extinguishing chamber and is easily extinguished without a zero-crossing state under the rated current of the DC system.

[0269] Example 4

[0270] Figure 22 This is another structural schematic diagram of the circuit breaker according to an embodiment of this application.

[0271] Please see Figure 22 The difference between this embodiment and embodiment 2 is that the first arc-extinguishing chamber 21 extends beyond the second arc-extinguishing chamber 22 in the direction from the first contact 91 to the second contact 92.

[0272] Further optionally, the second arc-extinguishing chamber 22 extends beyond the first arc-extinguishing chamber 21 in the direction from the second contact 92 to the first contact 91.

[0273] In some optional embodiments, the arc-extinguishing device 2 further includes a third arc-extinguishing chamber 24 and a second arc-guiding element 25. The third arc-extinguishing chamber 24 is disposed in the second arc-extinguishing zone 12 and is arranged with the second arc-extinguishing chamber 22 in the direction from the first contact 91 to the second contact 92, with a first gap between them to form a first exhaust channel from the first arc-extinguishing chamber 21 through the first gap to the exhaust port 10. The third arc-extinguishing chamber 24 and the first arc-extinguishing chamber 21 overlap in their orthogonal projections on the first plane along a first direction, and they can be arc-connected by the second arc-guiding element 25. The arc-initiating device 3 is used to introduce the arc current into the second arc-extinguishing chamber 22, the first arc-extinguishing chamber 21, and the third arc-extinguishing chamber 24 in the direction from the first contact 91 to the second contact 92.

[0274] Optionally, the second arc-extinguishing chamber 22 and the third arc-extinguishing chamber 24 are arranged sequentially along the third direction Z. That is, the stacking direction of the second arc-extinguishing chamber 22 and the stacking direction of the third arc-extinguishing chamber 24 are the same, both along the third direction Z. Furthermore, the second arc-extinguishing chamber 22 and the third arc-extinguishing chamber 24 have the same dimensions.

[0275] It should be noted that the stacking direction of the second arc-extinguishing chamber 22 and the stacking direction of the third arc-extinguishing chamber 24 may not be the same, but the requirement that the arc can be cut by the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22 and the third arc-extinguishing chamber 24 must be met. For example, the angle between the stacking direction of the second arc-extinguishing chamber 22 and the stacking direction of the third arc-extinguishing chamber 24 is 0°-15°.

[0276] Optionally, the third arc-extinguishing chamber 24 extends beyond the first arc-extinguishing chamber 21 in the direction from the first contact 91 to the second contact 92. Alternatively, the projection of the first arc-extinguishing chamber 21 along the first direction X onto the first plane may also cover the projection of the third arc-extinguishing chamber 24 along the first direction X onto the first plane.

[0277] In this embodiment, the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber 24 differ from the first embodiment 1 only in their arrangement and position. Other components, such as the first arc-guiding component 23, the second arc-guiding component 25, the first arc-initiating component 31, and the second arc-initiating component 32, are structurally modified to fulfill their intended functions.

[0278] For example, the first arc-initiating member 31 increases the length of the first straight plate segment 312 to be stacked with the third end of the second arc-extinguishing chamber 22, and the second arc-initiating member 32 increases the length of the second straight plate segment 322 to be stacked with the end of the third arc-extinguishing chamber 24 away from the second arc-extinguishing chamber 22.

[0279] For example, the first arc guide 23 and the second arc guide 25 only need to be flipped in the third direction Z. After flipping, the first arc guide segment 2310 of the first arc guide 23 is stacked with the first end of the first arc extinguishing chamber 21, and the second arc guide segment 2330 is stacked with the fourth end of the second arc extinguishing chamber 22. The third arc guide segment 251 of the second arc guide 25 is stacked with the second end of the first arc extinguishing chamber 21, and the fourth arc guide segment 253 is stacked with the end of the third arc extinguishing chamber 24 closest to the second arc extinguishing chamber 22.

[0280] The housing 1, the first arc blowing device, and the second arc blowing device are also adapted.

[0281] Similarly, the first arc guide 23 has a second gap with the inner wall of the circuit breaker to form a second exhaust channel from the second gap, the second arc-extinguishing chamber 22 to the exhaust port 10. The second arc guide 25 has a third gap with the inner wall of the circuit breaker to form a third exhaust channel from the third gap, the third arc-extinguishing chamber 24 to the exhaust port 10.

[0282] The arc extinguishing process of the arc extinguishing system of the circuit breaker in this embodiment is as follows:

[0283] When the first contact 91 and the second contact 92 just break apart, that is, in the early stage of breaking apart, an electric arc is generated between the first contact 91 and the second contact 92. The opening angle between the first contact 91 and the second contact 92 is relatively small. The second contact 92 is close to the grid plate closest to it in the first arc-extinguishing chamber 21. The arc root on the first contact 91 is guided to the first arc-initiating element 31 located on the lower side of the second arc-extinguishing chamber 22. Therefore, the electric arc is formed between the first contact 91, the first arc-initiating element 31, the second arc-extinguishing chamber 22, the first arc-guiding element 23, a small part of the grid plate of the first arc-extinguishing chamber 21 and the second contact 92. The high-temperature gas flows to the exhaust port 10 through the first exhaust channel and the second exhaust channel.

[0284] When the first contact 91 and the second contact 92 are further opened, that is, during the middle of the breaking, the number of grid plates of the first arc-extinguishing chamber 21 swept by the second contact increases, and an electric arc is formed between the first arc-initiating element 31, the second arc-extinguishing chamber 22, the first arc-guiding element 23, most of the grid plates of the first arc-extinguishing chamber 21 and the second contact 92, wherein high-temperature gas flows to the exhaust port 10 through the first exhaust channel and the second exhaust channel.

[0285] When the second contact 92 continues to open, that is, in the later stage of the breakage, the second contact 92 is adjacent to the second arc guide 25, and an electric arc is formed between the first arc ignition member 31, the second arc extinguishing chamber 22, the first arc guide 23, all the grids of the first arc extinguishing chamber 21, the second arc guide 25 and the second contact 92, wherein the high temperature gas flows to the exhaust port 10 through the first exhaust channel and the second exhaust channel.

[0286] When the second contact 92 is opened to its maximum position, i.e., completely disconnected, the arc root on the second contact 92 transfers to the second arc-initiating element 32. An electric arc is generated between the first arc-initiating element 31, the second arc-extinguishing chamber 22, the first arc-guiding element 23, the first arc-extinguishing chamber 21, the second arc-guiding element 25, the third arc-extinguishing chamber 24, the second arc-initiating element 32, and the second contact 92. The arc is cut by all the grids of the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, and the third arc-extinguishing chamber 24. The arc is stretched and cooled to the maximum extent.

[0287] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An arc-extinguishing system for a circuit breaker, the circuit breaker comprising a contact system and an exhaust port, the contact system comprising a first contact and a second contact, the second contact being rotatable relative to the first contact to connect or disconnect a circuit, wherein when the circuit is disconnected, an electric arc is generated between the second contact and the first contact, characterized in that, The arc extinguishing system includes: The housing has a receiving cavity, the receiving cavity including a first arc-extinguishing region and a second arc-extinguishing region arranged along a first direction, the first contact and the second contact being located in the receiving cavity on the side of the first arc-extinguishing region away from the second arc-extinguishing region; An arc-extinguishing device is located in the receiving cavity. The arc-extinguishing device includes a first arc-extinguishing chamber at least partially located in the first arc-extinguishing zone, a second arc-extinguishing chamber at least partially located in the second arc-extinguishing zone, and a first arc-guiding element. The projections of the first arc-extinguishing chamber and the second arc-extinguishing chamber onto a first plane along the first direction overlap, and the two can be electrically connected through the first arc-guiding element. The first arc-extinguishing chamber includes a first end and a second end opposite in the stacking direction. The second arc-extinguishing chamber includes a third end and a fourth end opposite in the stacking direction. The second end and the third end can be electrically connected through the first arc-guiding element. The first end can be electrically connected to a second contact, and the fourth end can be electrically connected to the first contact. The first end extends beyond the third end in the direction from the second end to the first end, and the fourth end extends beyond the second end in the direction from the third end to the fourth end. The projection of the first arc-extinguishing chamber onto the first plane along the first direction covers the projection of the third end onto the first plane along the first direction, wherein the first plane is perpendicular to the first direction. An arc-initiating device is used to introduce the electric arc into the first and second arc-extinguishing chambers.

2. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that, It also includes a first insulating member, which is fitted to the first arc guide member to provide electrical isolation between the first arc extinguishing chamber and the portion of the first arc guide member opposite to the first arc extinguishing chamber along the first direction.

3. The arc extinguishing system of the circuit breaker according to claim 2, characterized in that, The first arc guide member has a first surface and a second surface facing away from each other. The first arc guide member includes a first arc guide segment, a first connecting segment, a second connecting segment, and a second arc guide segment that are bent and connected in sequence. The first arc guide segment and the first connecting segment are bent toward the first surface, the first connecting segment and the second connecting segment are bent toward the second surface, and the second connecting segment and the second arc guide segment are bent toward the second surface to form a receiving cavity. The first arc-guided segment is stacked with the third end, and the first surface of the first arc-guided segment faces the second arc-extinguishing chamber. The second arc-guided segment is stacked with the second end, and the first surface of the second arc-guided segment faces the first arc-extinguishing chamber.

4. The arc extinguishing system of the circuit breaker according to claim 3, characterized in that, The first insulating member includes a first insulating segment, a second insulating segment, and a third insulating segment that are bent and connected in sequence. The first insulating segment is attached to the second surface of the first arc-guided segment, the second insulating segment is attached to the second surface of the first connecting segment, and the third insulating segment is located in the receiving cavity.

5. The arc extinguishing system of the circuit breaker according to claim 4, characterized in that, The first insulating component also includes an arc-blocking portion and a current-splitting portion. The arc-blocking portion is disposed at the bend of the second and third insulating sections and is located on the side of the first arc-extinguishing chamber closer to the second arc-extinguishing zone, for preventing the electric arc in the first arc-extinguishing chamber from moving to the second arc-extinguishing zone. The arc-blocking portion has a plurality of first vent holes adapted to the first arc-extinguishing chamber, allowing the gas generated by the electric arc in the first arc-extinguishing chamber to flow through the first vent holes along the second insulating section to the second arc-extinguishing zone. The diversion section is located on the side of the first insulating section away from the first arc-guiding section, and is used to divert the gas generated by the electric arc.

6. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that, It also includes a second insulating element, which is located on the side of the second arc-extinguishing chamber opposite to the first arc-extinguishing chamber, to prevent back-side breakdown of the second arc-extinguishing chamber. The second insulating element has a plurality of second vent holes adapted to the second arc-extinguishing chamber, so that the gas generated by the electric arc in the second arc-extinguishing chamber flows through the second vent holes to the exhaust port.

7. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that, It also includes two arc-isolating components arranged opposite to each other. Each arc-isolating component includes a first arc-isolating segment, a second arc-isolating segment, and a third arc-isolating segment connected in sequence. The first arc-isolating segment is located on the side of the first arc-extinguishing chamber away from the second arc-extinguishing chamber. The second arc-isolating segment is located on the side of the second arc-extinguishing chamber away from the first end. The third arc-isolating segment is located on the side of the second arc-extinguishing chamber close to the first arc-extinguishing chamber and is partially sandwiched between the first arc-guided component and the second arc-extinguishing chamber. A narrow gap is formed between the two arc-isolating components to allow the electric arc to move along the narrow gap into the first arc-extinguishing chamber and the second arc-extinguishing chamber.

8. The arc extinguishing system of the circuit breaker according to claim 7, characterized in that, The first arc-extinguishing chamber includes a plurality of stacked first grid plates. Each first grid plate includes a first body and two first extensions. The first extensions extend from the first body toward a side away from the second arc-extinguishing chamber. The two first extensions are arranged opposite each other and cooperate with the two first arc-blocking segments respectively to form a magnetic field that causes the electric arc to move toward the first arc-extinguishing chamber.

9. The arc extinguishing system of the circuit breaker according to claim 7, characterized in that, The second arc-extinguishing chamber includes multiple stacked second and third grid plates, with the multiple second grid plates located in the middle of the second arc-extinguishing chamber and the multiple third grid plates located on both sides of the second grid plates. The second grid plate includes a second body and two second extensions extending from the second body toward the contact system. The two second extensions are arranged opposite each other and cooperate with the two arc-blocking members respectively to form a magnetic field that causes the electric arc to move toward the second arc-extinguishing chamber.

10. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that, It also includes a third arc-extinguishing chamber and a second arc-guiding component. The third arc-extinguishing chamber is located in the first arc-extinguishing zone, and the first and third arc-extinguishing chambers are arranged along the direction from the first end to the second end. The third arc-extinguishing chamber includes a fifth end and a sixth end that are opposite to each other in the stacking direction. The fifth end is located between the sixth end and the second end. The fifth end can be electrically connected to the fourth end through the second arc-guiding member. The sixth end can be electrically connected to the first contact through the arc-initiating device. The projections of the second arc-extinguishing chamber and the third arc-extinguishing chamber on the first plane along the first direction overlap.

11. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that, The arc-starting device includes a first arc-starting component and a second arc-starting component. One end of the first arc-initiating element is connected to the first contact, and the other end of the first arc-initiating element is stacked with the fourth end of the second arc-extinguishing chamber. One end of the second arc-initiating element can be electrically connected to the second contact, and the other end of the second arc-initiating element is stacked with the first end of the first arc-extinguishing chamber.

12. A circuit breaker, characterized in that, include: The arc extinguishing system of the circuit breaker as described in any one of claims 1-11.

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