Arc extinguish chamber structure and circuit breaker

Abstract

The invention provides an arc extinguish chamber structure and a circuit breaker, and relates to the technical field of electric appliance switches. The arc extinguish chamber structure comprises a contact mechanism, an air blowing assembly and an arc extinguish chamber, the contact mechanism comprises a static contact and a moving contact assembly, the moving contact assembly is movably arranged in a shell to be close to or far away from the static contact to realize opening and closing of the circuit breaker, the arc extinguish chamber is located on the side face of the contact mechanism, and an inlet of the arc extinguish chamber faces the moving contact assembly and the static contact; the air blowing assembly comprises an air bag and an air injection assembly communicated with the air bag, the air bag is located on the side, away from the static contact, of the moving contact assembly, and an air injection opening of the air injection assembly is located on the side face of the static contact and faces an inlet of the arc extinguish chamber. And during opening, the moving contact assembly compresses the air bag, so that the air nozzle blows air to the electric arc between the static contact and the moving contact assembly. The arc extinguish chamber structure has high breaking reliability, and can meet the arc extinguish requirement under the working condition of high voltage and small current.

Description

Technical Field

[0001] This application relates to the field of electrical switch technology, and more specifically, to an arc-extinguishing chamber structure and a circuit breaker. Background Technology

[0002] In the field of DC circuit protection, the arc-extinguishing chamber is the core component of a circuit breaker for extinguishing electric arcs and ensuring safe circuit switching; its performance directly determines the breaking reliability of the circuit breaker. Existing DC arc-extinguishing chamber structures have significant technical limitations when handling low-current breaking conditions, especially critical current breaking scenarios. Due to the small amplitude of the critical current and the large distance between the arc and the grid slots, the magnetic blow-out force is weak, making it difficult to effectively pull and transfer the arc into the grid of the arc-extinguishing chamber for extinguishing.

[0003] Currently, the industry mainly relies on increasing the arc gap and incorporating narrow slit structures in the gas-generating components to break the arc. However, with the continuous increase in power system voltage levels, the arc gap cannot be significantly increased due to limitations in the overall equipment structure and installation space, making it difficult to meet the arc-extinguishing requirements of high-voltage operating conditions. Furthermore, the narrow slit structure of the gas-generating components has a significant impact on the arc morphology and gas generation efficiency, easily leading to unstable breaking performance and failing to meet the reliability requirements of high-voltage DC circuits for arc-extinguishing chambers. Summary of the Invention

[0004] The purpose of this application is to address the shortcomings of the prior art by providing an arc-extinguishing chamber structure and circuit breaker that has high breaking reliability and can meet the arc-extinguishing requirements under high voltage and low current conditions.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows: In one aspect of this application, an arc-extinguishing chamber structure is provided, disposed within a housing. The arc-extinguishing chamber structure includes: a contact mechanism, an air-blowing assembly, and an arc-extinguishing chamber. The contact mechanism includes a stationary contact and a moving contact assembly. The moving contact assembly is movably disposed within the housing, near or away from the stationary contact, to realize the opening and closing of the circuit breaker. The arc-extinguishing chamber is located on the side of the contact mechanism, with its inlet facing the moving contact assembly and the stationary contact. The air-blowing assembly includes an air bladder and a jet assembly communicating with the air bladder. The air bladder is located on the side of the moving contact assembly away from the stationary contact, and the jet outlet of the jet assembly is located on the side of the stationary contact and faces the inlet of the arc-extinguishing chamber. When the circuit is opened, the moving contact assembly compresses the air bladder so that the jet outlet blows air into the arc between the stationary contact and the moving contact assembly.

[0006] Optionally, the jet assembly includes a first vent that extends from outside the arc extinguishing chamber to inside the arc extinguishing chamber, with the jet outlet located near the stationary contact.

[0007] Optionally, the jet outlet is configured as a through hole or nozzle on the first vent.

[0008] Optionally, the air inlet of the first vent faces the stationary contact, and the air outlet is configured as a nozzle on the first vent. The number of nozzles is at least two, and the at least two nozzles are spaced apart along the extension direction of the first vent.

[0009] Optionally, the first venting section includes at least two first sub-venting sections, which are connected sequentially. The number of first sub-venting sections is equal to the number of nozzles and their positions correspond one-to-one. The diameter of the at least two first sub-venting sections decreases sequentially from the stationary contact to the direction away from the stationary contact.

[0010] Optionally, the diameters of at least two nozzles decrease sequentially in the direction away from the stationary contact.

[0011] Optionally, the jet assembly further includes a second vent and a third vent, one end of the second vent is connected to the airbag and the other end extends to the side of the stationary contact and is connected to the third vent, and the third vent extends from the second vent to the arc-extinguishing chamber and is connected to the first vent.

[0012] Optionally, the second ventilation section includes a second sub-ventilation section, a third sub-ventilation section, and a fourth sub-ventilation section. One end of the second sub-ventilation section is connected to the third ventilation section, and the other end extends to the airbag and is connected to the third sub-ventilation section. The other end of the third sub-ventilation section extends to the side of the airbag away from the moving contact assembly and is connected to the fourth sub-ventilation section. The other end of the fourth sub-ventilation section is connected to the side of the airbag away from the moving contact assembly.

[0013] Optionally, the jet outlet is configured as a nozzle on the first ventilation section. The nozzle includes a spray tube, one end of which is connected to the first ventilation section. The end face of the spray tube away from the first ventilation section is provided with a plurality of first spray holes, which are evenly distributed on the end face of the spray tube.

[0014] Optionally, the side of the spray nozzle is provided with a plurality of second spray holes, which are evenly distributed around the axis of the spray nozzle.

[0015] Optionally, it also includes a base, on which the moving contact assembly is rotatably mounted, and the airbag is fixed to the base.

[0016] In another aspect of the embodiments of this application, a circuit breaker is provided, including a housing and an arc-extinguishing chamber structure as described above disposed within the housing.

[0017] The beneficial effects of this application include: This application provides an arc-extinguishing chamber structure, disposed within a housing. The arc-extinguishing chamber structure includes a contact mechanism, an air-blowing assembly, and an arc-extinguishing chamber. The contact mechanism includes a stationary contact and a moving contact assembly. The moving contact assembly is movably disposed within the housing, near or away from the stationary contact, to realize the opening and closing of the circuit breaker. The arc-extinguishing chamber is located on the side of the contact mechanism, with its inlet facing the moving contact assembly and the stationary contact. The air-blowing assembly includes an air bladder and an air jet assembly communicating with the air bladder. The air bladder is located on the side of the moving contact assembly away from the stationary contact, and the air jet assembly's air jet outlet is located on the side of the stationary contact and faces the inlet of the arc-extinguishing chamber. During opening, the moving contact assembly compresses the air bladder, causing the air jet outlet to blow air into the arc between the stationary and moving contact assemblies. This arc-extinguishing chamber structure, by adding an air-blowing assembly and adopting a design that links the air-blowing assembly with the moving contact assembly, can directionally blow air between the moving and stationary contacts simultaneously with the opening action, quickly blowing the arc generated during opening into the arc-extinguishing chamber to extinguish it. This structure significantly improves breaking reliability, overcoming the limitations of insufficient magnetic blow-out force even under high-voltage, low-current conditions, achieving efficient arc transfer and reliable arc extinguishing. Simultaneously, it cleverly utilizes the existing moving contact assembly to trigger the airbag's exhaust, eliminating the need for additional drive mechanisms or control components, simplifying the overall structural design, effectively controlling manufacturing costs, and demonstrating strong practicality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the circuit breaker in the closing position provided in the embodiments of this application; Figure 2 This is one of the structural schematic diagrams of the air blowing assembly provided in the embodiments of this application; Figure 3 This is a schematic diagram of the circuit breaker during tripping, provided in an embodiment of this application. Figure 4 A schematic diagram illustrating the change process of the airbag in the air-blowing assembly provided in this application during the opening and closing process; Figure 5 This is a second schematic diagram of the structure of the air blowing assembly provided in the embodiments of this application; Figure 6 for Figure 2 A magnified view of a portion of point A in the middle.

[0020] Icons: 10-Arc-extinguishing chamber structure; 111-Contact support; 112-Stationary contact; 113-Moving contact; 12-Air blowing assembly; 121-Airbag; 122-Air pipe; 1221-First ventilation section; 1221a-First sub-ventilation section; 1222-Second ventilation section; 1222a-Second sub-ventilation section; 1222b-Third sub-ventilation section; 1222c-Fourth sub-ventilation section; 1223-Third ventilation section; 123-Nozzle; 1231-Spray tube; 1232-First spray hole; 1233-Second spray hole; 13-Arc-extinguishing chamber; 131-Inlet of arc-extinguishing chamber; 14-Base; 20-Housing shell; 30-Electric arc. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They 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. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Please refer to Figure 1 This application provides an arc-extinguishing chamber structure 10, which is disposed within a housing 20. The housing 20 can be the housing of an electrical switch such as a circuit breaker or a disconnecting switch.

[0027] The arc-extinguishing chamber structure 10 includes a contact mechanism, an air-blowing assembly 12, and an arc-extinguishing chamber 13. The contact mechanism includes a stationary contact 112 and a moving contact assembly. The moving contact assembly is movably disposed within the housing 20, near or away from the stationary contact 112, to achieve the opening and closing of the circuit breaker. The arc-extinguishing chamber 13 is located on the side of the contact mechanism, with its inlet 131 facing the moving contact assembly and the stationary contact 112. The arc-extinguishing chamber 13 is used to extinguish the electric arc 30 generated when the moving contact assembly and the stationary contact 112 open.

[0028] It is understood that the moving contact assembly includes at least a contact support 111 and a moving contact 113 disposed on the contact support 111. The moving contact 113 is the component in the moving contact assembly that is in direct contact with the stationary contact 112, and an electric arc is formed between the moving contact 113 and the stationary contact 112.

[0029] Please refer to the reference. Figure 2 and Figure 3 The air-blowing assembly 12 includes an airbag 121 and an air jet assembly communicating with the airbag 121. The airbag 121 is located on the side of the moving contact assembly opposite to the stationary contact 112. The air jet nozzle of the air jet assembly is located on the side of the stationary contact 112 and faces the inlet 131 of the arc-extinguishing chamber. During opening, the moving contact assembly compresses the airbag 121, causing the air jet nozzle to blow air into the arc between the stationary contact 112 and the moving contact 113. Since the air jet nozzle faces the inlet of the arc-extinguishing chamber 13, the arc 30 is blown into the arc-extinguishing chamber 13.

[0030] It should be noted that the moving contact assembly can directly compress the airbag 121. For example, the contact support 111 in the moving contact assembly can compress the airbag 121, or the moving contact 113 in the moving contact assembly can compress the airbag 121. The moving contact assembly can also indirectly compress the airbag 121. For example, the moving contact assembly can drive the transmission component (such as a connecting rod) linked with it to compress the airbag 121.

[0031] A jet nozzle can be a single outlet capable of ejecting gas, or a combination of two or more small outlets capable of ejecting gas.

[0032] The aforementioned arc-extinguishing chamber structure 10, by adding an air-blowing component 12 and employing a design that links the air-blowing component 12 with the moving contact component, can directionally blow air between the moving and stationary contacts simultaneously with the tripping action, quickly blowing the arc 30 generated during tripping into the arc-extinguishing chamber 13 for complete extinguishing. This structure significantly improves tripping reliability, overcoming the limitations of insufficient magnetic blowing force even under high-voltage, low-current conditions, achieving efficient transfer and reliable arc extinguishing of the arc 30. Simultaneously, it cleverly utilizes the existing moving contact component to trigger the airbag 121 for exhaust, eliminating the need for additional drive mechanisms or control components, simplifying the overall structural design, effectively controlling manufacturing costs, and possessing strong practicality.

[0033] Alternatively, please refer to Figure 1 , Figure 3 and Figure 4 The airbag 121 is elastic; when the moving contact assembly is in the open position, the airbag 121 is compressed; when the moving contact assembly is in the closed position, the airbag 121 is restored.

[0034] During the opening and closing process of the contact mechanism, the airbag 121 is compressed, and the gas inside the airbag 121 is squeezed out from the jet nozzle of the jet assembly. The arc 30 enters the arc-extinguishing chamber 13 or is extinguished under the instantaneous air blowing action. When the moving contact assembly is in the open position, the airbag 121 is fully compressed, and there is no continuous gas ejection from the jet assembly. When the moving contact assembly closes, the jet nozzle absorbs gas in the arc-extinguishing chamber 13, causing the airbag 121 to recover and wait for the next opening. Using the existing moving contact assembly to trigger the compression or recovery of the airbag 121 is simple in structure and low in cost. At the same time, the elastic airbag 121 can absorb the impact energy of the moving contact assembly when opening, thereby reducing the rebound of the moving contact assembly.

[0035] It is understood that the airbag 121 can be made of insulating material or non-insulating material. The shape of the airbag 121 can be square, round, sheet-like, or any other shape that can achieve the same effect.

[0036] Alternatively, please refer to Figure 2 and Figure 3 The jet assembly includes a first vent 1221, which extends from outside the arc-extinguishing chamber 13 into the arc-extinguishing chamber 13, with the jet nozzle positioned close to the stationary contact 112. This allows the arc to be blown into the arc-extinguishing chamber more quickly for extinguishing.

[0037] Optionally, the jet outlet is configured as a through hole or nozzle 123 on the first vent 1221.

[0038] Setting the jet nozzle as a through hole on the first vent 1221 results in a simple and compact structure that requires no additional parts, reducing processing and assembly costs. It also minimizes airflow path resistance, resulting in low airflow loss and a fast jet response. Setting the jet nozzle as a nozzle 123 on the first vent 1221 allows for greater flexibility in its design. Different nozzle 123 structures can be designed to achieve various blowing schemes; for example, a Laval nozzle can eject a high-density, high-velocity, nearly parallel airflow.

[0039] Optionally, the air inlet end of the first vent 1221 faces the stationary contact 112, and the air outlet is configured as a nozzle 123 on the first vent 1221. The number of nozzles 123 is at least two, and the at least two nozzles 123 are distributed at intervals along the extension direction of the first vent 1221.

[0040] Gas in the airbag 121 can enter the first vent 1221 from the air inlet end along any path. The design of the first vent 1221 ensures that at least two nozzles 123 sequentially expel gas along the direction the contact opens. Figure 2 and Figure 3 In the illustrated embodiment, when the passive contact assembly of the airbag 121 is compressed, the left nozzle 123 first ejects gas, followed by the right nozzle 123. By setting a staged jetting structure with at least two nozzles 123, the entire opening distance range of the contact can be covered, ensuring that the arc 30 is subjected to air blowing throughout the entire process of formation and elongation, further improving the arc 30 transfer efficiency and arc extinguishing reliability.

[0041] Alternatively, please refer to Figure 3 and Figure 5 The first venting section 1221 includes at least two first sub-venting sections 1221a, which are connected sequentially. The number of first sub-venting sections 1221a is equal to the number of nozzles 123, and their positions correspond one-to-one; that is, each first sub-venting section 1221a is provided with one nozzle 123. From the stationary contact 112 away from the stationary contact 112, the diameter of the at least two first sub-venting sections 1221a decreases sequentially.

[0042] The first ventilation section 1221 is composed of multiple first sub-ventilation sections 1221a with successively decreasing diameters. The smaller the diameter of the first sub-ventilation section 1221a, the greater the resistance to gas. This makes it easier for gas to be ejected from the nozzle 123 closest to the stationary contact 112 first, thereby avoiding gas being ejected only from the nozzle 123 furthest from the stationary contact 112, further improving the arc extinguishing effect and arc extinguishing speed.

[0043] by Figure 5In the embodiment shown, the first sub-vent 1221a on the left is closer to the stationary contact 112 and has a larger diameter, while the first sub-vent 1221a on the right is farther away from the stationary contact 112 and has a smaller diameter.

[0044] Optionally, the diameters of at least two nozzles 123 decrease sequentially in the direction away from the stationary contact 112.

[0045] The smaller the diameter of the nozzle 123, the greater the resistance to the gas. This makes it easier for the gas to be ejected first from the nozzle 123 closest to the stationary contact 112, thus avoiding the gas being ejected only from the nozzle 123 furthest from the stationary contact 112.

[0046] by Figure 5 In the embodiment shown, the nozzle 123 on the left is closer to the stationary contact 112 and has a larger diameter, while the nozzle 123 on the right is further away from the stationary contact 112 and has a smaller diameter.

[0047] Of course, the schemes of decreasing diameter of the first sub-vent 1221a and decreasing diameter of the nozzle 123 in sequence from the stationary contact 112 away from the stationary contact 112 can be used in combination to improve the guiding effect of gas.

[0048] Optionally, the jet assembly further includes a second vent 1222 and a third vent 1223. One end of the second vent 1222 is connected to the airbag 121, and the other end extends to the side of the stationary contact 112 and connects to the third vent 1223. The third vent 1223 extends from the second vent 1222 toward the arc-extinguishing chamber 13 and connects to the first vent 1221. In this way, the gas in the airbag 121 can be guided into the first vent 1221 without occupying too much space.

[0049] Optionally, the second ventilation section 1222 includes a second sub-ventilation section 1222a, a third sub-ventilation section 1222b, and a fourth sub-ventilation section 1222c. One end of the second sub-ventilation section 1222a is connected to the third ventilation section 1223, and the other end extends to the airbag 121 and is connected to the third sub-ventilation section 1222b. The other end of the third sub-ventilation section 1222b extends to the side of the airbag 121 opposite to the moving contact assembly and is connected to the fourth sub-ventilation section 1222c. The other end of the fourth sub-ventilation section 1222c is connected to the side of the airbag 121 opposite to the moving contact assembly. This configuration avoids interference between the second ventilation section 1222 and the moving contact assembly and the airbag 121, and prevents the second ventilation section 1222 from affecting the linkage between the moving contact assembly and the airbag 121.

[0050] Optionally, the jet assembly also includes an air tube 122, which communicates with the airbag 121, and the jet nozzle is disposed on the air tube 122. In this case, the first ventilation section 1221, the second ventilation section 1222, and the third ventilation section 1223 are all part of the air tube 122.

[0051] Alternatively, please refer to Figure 2 , Figure 3 and Figure 6 The jet outlet is configured as a nozzle 123 on the first ventilation section 1221. The nozzle 123 includes a spray tube 1231. One end of the spray tube 1231 is connected to the first ventilation section 1221. The end face of the spray tube 1231 away from the first ventilation section 1221 is provided with a plurality of first spray holes 1232. The plurality of first spray holes 1232 are evenly distributed on the end face of the spray tube 1231.

[0052] The nozzle 123 is securely connected to the first venting section 1221 via the spray tube 1231, ensuring the gas delivery is sealed. Multiple first spray holes 1232 evenly distributed on the end face disperse the airflow into multiple uniform airflow streams, expanding the air blowing coverage area and enhancing the ability to envelop and pull the arc 30 between the contacts. Simultaneously, uniform airflow avoids excessively strong or weak local airflow, ensuring balanced force on the arc 30 during its formation and elongation, facilitating the rapid and stable transfer of the arc 30 to the arc-extinguishing chamber 13, adapting to high-voltage, low-current operating conditions, and further optimizing arc-extinguishing reliability.

[0053] Optionally, the side of the spray nozzle 1231 is provided with a plurality of second spray holes 1233, which are evenly distributed around the axis of the spray nozzle 1231.

[0054] The second nozzles 1233, evenly arranged around the axis on the side of the nozzle 1231, can form an annular air curtain. In conjunction with the first nozzle 1232, it can achieve all-round air blowing, strengthen the wrapping and traction of the electric arc 30, avoid local airflow blind spots, help the electric arc 30 to be evenly stressed and quickly transferred, and further improve the reliability of arc extinguishing.

[0055] Alternatively, please refer to Figure 1 and Figure 3 The arc-extinguishing chamber structure 10 also includes a base 14, a moving contact assembly is rotatably mounted on the base 14, and an airbag 121 is fixed on the base 14.

[0056] The base 14 provides a stable mounting reference for the moving contact assembly and the airbag 121. The rotating setting of the moving contact assembly can ensure accurate and smooth opening action. The airbag 121 is fixed to the base 14 to avoid displacement during air jetting and ensure stable air blowing direction.

[0057] This embodiment also provides a circuit breaker, including a housing 20 and an arc-extinguishing chamber structure 10 as described above disposed within the housing 20.

[0058] The circuit breaker includes the same structure and beneficial effects as the arc-extinguishing chamber structure 10 in the foregoing embodiments. The structure and beneficial effects of the arc-extinguishing chamber structure 10 have been described in detail in the foregoing embodiments and will not be repeated here.

[0059] The above description is merely an optional embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An arc-extinguishing chamber structure, disposed within a shell (20), characterized in that, The arc-extinguishing chamber structure (10) includes: a contact mechanism, an air-blowing assembly (12), and an arc-extinguishing chamber (13). The contact mechanism includes a stationary contact (112) and a moving contact assembly. The moving contact assembly is movably disposed within the housing (20) near or away from the stationary contact (112) to realize the opening and closing of the circuit breaker. The arc-extinguishing chamber (13) is located on the side of the contact mechanism, and the entrance (131) of the arc-extinguishing chamber faces the moving contact assembly and the stationary contact (112). The air blowing assembly (12) includes an air bag (121) and an air jet assembly communicating with the air bag (121). The air bag (121) is located on the side of the moving contact assembly away from the stationary contact (112). The air jet nozzle of the air jet assembly is located on the side of the stationary contact (112) and faces the inlet (131) of the arc extinguishing chamber. When the circuit is opened, the moving contact assembly compresses the air bag (121) so that the air jet nozzle blows air into the arc (30) between the stationary contact (112) and the moving contact assembly.

2. The arc-extinguishing chamber structure as described in claim 1, characterized in that, The jet assembly includes a first vent (1221) extending from outside the arc-extinguishing chamber (13) into the arc-extinguishing chamber (13), and the jet outlet is located near the stationary contact (112).

3. The arc-extinguishing chamber structure as described in claim 2, characterized in that, The jet outlet is configured as a through hole or nozzle (123) on the first vent (1221).

4. The arc-extinguishing chamber structure as described in claim 3, characterized in that, The air inlet of the first vent (1221) faces the stationary contact (112), and the air outlet is configured as a nozzle (123) on the first vent (1221). The number of nozzles (123) is at least two, and the at least two nozzles (123) are distributed at intervals along the extension direction of the first vent (1221).

5. The arc-extinguishing chamber structure as described in claim 4, characterized in that, The first ventilation section (1221) includes at least two first sub-ventilation sections (1221a), which are connected in sequence. The number of the first sub-ventilation sections (1221a) is equal to the number of the nozzles (123) and their positions correspond one-to-one. The diameter of the at least two first sub-ventilation sections (1221a) decreases in sequence from the stationary contact (112) away from the stationary contact (112).

6. The arc-extinguishing chamber structure as described in claim 4, characterized in that, The diameters of at least two of the nozzles (123) decrease sequentially from the stationary contact (112) toward the direction away from the stationary contact (112).

7. The arc-extinguishing chamber structure as described in claim 2, characterized in that, The jet assembly further includes a second vent (1222) and a third vent (1223). One end of the second vent (1222) is connected to the airbag (121), and the other end extends to the side of the stationary contact (112) and is connected to the third vent (1223). The third vent (1223) extends from the second vent (1222) toward the arc-extinguishing chamber (13) and is connected to the first vent (1221).

8. The arc-extinguishing chamber structure as described in claim 7, characterized in that, The second ventilation section (1222) includes a second sub-ventilation section (1222a), a third sub-ventilation section (1222b), and a fourth sub-ventilation section (1222c). One end of the second sub-ventilation section (1222a) is connected to the third ventilation section (1223), and the other end extends to the airbag (121) and is connected to the third sub-ventilation section (1222b). The other end of the third sub-ventilation section (1222b) extends to the side of the airbag (121) away from the moving contact assembly and is connected to the fourth sub-ventilation section (1222c). The other end of the fourth sub-ventilation section (1222c) is connected to the side of the airbag (121) away from the moving contact assembly.

9. The arc-extinguishing chamber structure as described in claim 3, characterized in that, The jet outlet is configured as a nozzle (123) on the first ventilation section (1221). The nozzle (123) includes a spray tube (1231). One end of the spray tube (1231) is connected to the first ventilation section (1221). The end face of the spray tube (1231) away from the first ventilation section (1221) is provided with a plurality of first spray holes (1232). The plurality of first spray holes (1232) are evenly distributed on the end face of the spray tube (1231).

10. The arc-extinguishing chamber structure as described in claim 9, characterized in that, The side of the spray nozzle (1231) is provided with a plurality of second spray holes (1233), and the plurality of second spray holes (1233) are evenly distributed around the axis of the spray nozzle (1231).

11. The arc-extinguishing chamber structure as described in claim 1, characterized in that, It also includes a base (14), the movable contact assembly is rotatably mounted on the base (14), and the airbag (121) is fixed on the base (14).

12. A circuit breaker, characterized in that, It includes a housing (20) and an arc-extinguishing chamber structure as described in any one of claims 1 to 11 disposed within the housing (20).

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