A circuit breaker arc extinguishing structure and circuit breaker

Abstract

The application provides a circuit breaker arc extinguishing structure and a circuit breaker, and relates to the technical field of circuit breakers. The circuit breaker arc extinguishing structure comprises an arc extinguishing assembly and an insulating support; the support has a containing cavity on one side, and at least part of the arc extinguishing assembly is arranged in the containing cavity; the top wall of the arc extinguishing chamber of the arc extinguishing assembly has a protection section, the protection section extends away from the support, and at least part of the protection section is exposed outside the containing cavity and parallel to the corresponding area of the shell; the arc extinguishing chamber has a plurality of first arc extinguishing fins arranged at intervals along the height of the support; at least one first arc extinguishing fin close to the top wall is located in the arc extinguishing chamber and below the protection section on the side away from the support, the top arc does not contact the shell above the arc extinguishing chamber, the protection section and the protection space formed below the protection section play a buffering role on the arc, to a certain extent, the phenomenon that the shell is broken by the arc is avoided, the shell is effectively protected, and the service life of the circuit breaker is ensured.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and in particular to a circuit breaker arc extinguishing structure and a circuit breaker. Background Technology

[0002] A circuit breaker is a device that can close, carry, and interrupt current under normal circuit conditions, and can close, carry, and interrupt current under abnormal circuit conditions within a specified time, thus protecting circuits and electrical equipment.

[0003] The circuit breaker includes a housing, within which components such as an arc-extinguishing module and a contact assembly are housed. The moving contact of the contact assembly can rotate relative to the housing to make contact with the stationary contact of the contact assembly to achieve closing, or to separate from the stationary contact to achieve opening. The arc-extinguishing module is used to extinguish the arc generated when the stationary and moving contacts separate, so as to prevent the arc from affecting or damaging other components inside the circuit breaker.

[0004] However, in related technologies, the casing of the arc extinguishing module is prone to cracking during the arc extinguishing process, which reduces the service life of the circuit breaker. Utility Model Content

[0005] This application provides an arc-extinguishing structure and circuit breaker to reduce the possibility of the circuit breaker casing being broken by electric arc impact during the arc extinguishing process, thereby achieving effective protection of the casing and improving the service life of the circuit breaker.

[0006] In a first aspect, this application provides a circuit breaker arc-extinguishing structure for installation within the circuit breaker housing. The arc-extinguishing structure includes an arc-extinguishing assembly and an insulating support member. One side of the support member has a receiving cavity, in which at least a portion of the arc-extinguishing assembly is disposed. The arc-extinguishing assembly has an arc-extinguishing cavity, and the top wall of the arc-extinguishing cavity has a protective section extending away from the support member. At least a portion of the protective section is exposed outside the receiving cavity and is arranged parallel to a corresponding area of ​​the housing. The arc-extinguishing assembly includes a plurality of first arc-extinguishing grids disposed within the arc-extinguishing cavity. The plurality of first arc-extinguishing grids are spaced apart along the height direction of the support member, and at least one end of a first arc-extinguishing grid near the top wall, facing away from the support member, is located within the arc-extinguishing cavity and below the protective section.

[0007] The arc-extinguishing structure for a circuit breaker provided in this application comprises an arc-extinguishing assembly and an insulating support member. A receiving cavity is provided on one side of the support member, and at least a portion of the arc-extinguishing assembly is disposed within the receiving cavity. The top wall of the arc-extinguishing cavity of the arc-extinguishing assembly has a protective section extending away from the support member, with at least a portion of the protective section exposed outside the receiving cavity. The protective section is arranged parallel to a corresponding area of ​​the housing; that is, the top wall of the arc-extinguishing cavity has a protective section extending to the outside of the receiving cavity, and the protective section is parallel to the corresponding area of ​​the housing. The arc-extinguishing assembly includes a plurality of first arc-extinguishing grids disposed within the arc-extinguishing cavity. The plurality of first arc-extinguishing grids are arranged at intervals along the height of the support member. At least one end of a first arc-extinguishing grid near the top wall of the arc-extinguishing cavity, facing away from the support member, is located inside the arc-extinguishing cavity and below the protective section. In this configuration, the protective section separates the arc-extinguishing chamber from the shell above the arc-extinguishing chamber, and the protective section together with the side of at least one first arc-extinguishing grid plate near the top wall of the arc-extinguishing chamber away from the support member forms the protective space of the shell. That is, the protective section and the side of at least one first arc-extinguishing grid plate near it away from the support member form the protective space.

[0008] In practical use, during the arc extinguishing process, the protective section isolates the arc from the casing above the arc extinguishing chamber. Therefore, arcs near the top of the arc extinguishing chamber enter the protective space. Even if they come into contact with the protective section, they will not directly impact the casing above the arc extinguishing chamber, reducing the possibility of the casing breaking due to direct arc impact. Furthermore, because the protective section separates the arc extinguishing chamber from the casing above it, the protective section and the protective space below it act as a buffer against the arc, further reducing the possibility of the casing breaking due to indirect arc impact during arc extinguishing. This effectively protects the casing and ensures the service life of the circuit breaker.

[0009] Meanwhile, the protective section and the protective space formed below it can, to some extent, prevent components located on the side of the protective section away from the support from being punctured, thus improving safety and further ensuring the service life of the circuit breaker.

[0010] In one possible design, the area of ​​the housing corresponding to the protective section is a horizontal plane, and the protective section is a horizontal plane that extends in the horizontal direction away from the support.

[0011] With the above scheme, the protective section is designed to be a horizontal plane that matches the shell of the corresponding area, making the protective section parallel to the shell above it. This design, compared to a non-parallel design, allows for a smaller protective section while maintaining the same level of protection. This reduces the manufacturing cost of the protective section.

[0012] In one possible design, a first connecting part is provided on the side wall of the protective section, and a second connecting part is provided on the cavity wall of the arc-extinguishing cavity. The protective section is connected to the cavity wall of the arc-extinguishing cavity through the first connecting part and the second connecting part.

[0013] With the above-described design, the protective section is installed on the cavity wall of the arc-extinguishing chamber via the first and second connecting parts, facilitating assembly and ensuring stable connection. Simultaneously, this enhances the structural stability of the protective section, thereby improving its resistance to arc impact and further preventing the shell from cracking due to arc impact.

[0014] In one possible design, the first connecting portion includes a connecting protrusion, and the second connecting portion includes a connecting groove into which the connecting protrusion can extend and engage.

[0015] With the above scheme, the protective section is installed on the cavity wall of the arc-extinguishing cavity through the cooperation of the connecting protrusion and the connecting groove. The structure is simple, easy to manufacture, and the connection is convenient and stable.

[0016] In one possible design, there are at least two first connecting parts, with at least two first connecting parts located on both sides of the protective section, and at least two second connecting parts, with each second connecting part corresponding to one of the first connecting parts.

[0017] The above scheme involves setting multiple first connecting parts on the protective section and multiple second connecting parts on the cavity wall of the arc-extinguishing chamber. The protective section is installed on the arc-extinguishing chamber through the cooperation of multiple sets of first and second connecting parts, which further improves the structural stability of the protective section and thus further enhances its resistance to electric arc impact, resulting in better protection of the shell.

[0018] In one possible design, the arc extinguishing assembly includes a second arc extinguishing grid and two opposing and spaced-apart connecting plates. The second arc extinguishing grid is disposed between the two connecting plates, and both ends of the second arc extinguishing grid are respectively connected to the top of the two connecting plates. The second arc extinguishing grid and the two connecting plates together enclose an arc extinguishing cavity, with the second arc extinguishing grid forming a top wall. Both ends of each first arc extinguishing grid are respectively connected to the two connecting plates.

[0019] The above scheme forms an arc-extinguishing cavity by two opposing and spaced-apart connecting plates and a second arc-extinguishing grid plate connected to the top of the two connecting plates. The structure is simple and easy to manufacture. Furthermore, the second arc-extinguishing grid plate forms the top wall of the arc-extinguishing cavity, thus not only extinguishing the arc but also buffering it and isolating it from the casing, thereby protecting the casing.

[0020] In one possible design, the two bottommost first arc-extinguishing grid plates are fitted together.

[0021] With the above solution, since the stationary contact assembly of the circuit breaker is located inside the arc-extinguishing cavity and below all the first arc-extinguishing grid plates, the two lowest first arc-extinguishing grid plates are fitted together, forming a thicker arc-extinguishing grid plate that is closer to the arc ignition point, facilitating arc extinguishing. This also improves the structural strength and burn-resistance, and to a certain extent avoids the phenomenon of arc breakdown, thus helping to extend the service life of the arc-extinguishing assembly.

[0022] In one possible design, the circuit breaker arc extinguishing structure also includes a stationary contact assembly; the stationary contact assembly includes a conductive element, a stationary contact, and a conductive arc-inducing element. The conductive element is located at the bottom of the support member, and the stationary contact and the arc-inducing element are both located on the side of the conductive element facing the support member. The bottom of the support member has a clearance hole for the stationary contact and the arc-inducing element to be exposed in the arc extinguishing cavity. The stationary contact is located on the side of the moving contact assembly inside the housing, and the arc-inducing element is located on the side of the stationary contact opposite to the moving contact assembly.

[0023] The above solution allows the stationary contact assembly to include a conductive element, a stationary contact, and an arc-starting element. The stationary contact and arc-starting element are positioned at the bottom of the support via the conductive element, facilitating assembly. Because the bottom of the support has a clearance hole for the stationary contact and arc-starting element to be exposed within the arc-extinguishing cavity, after the conductive element is connected to the support, the stationary contact and arc-starting element are exposed within the arc-extinguishing cavity. Furthermore, the arc-starting element is located on the side of the stationary contact away from the moving contact assembly. This allows the arc-starting element to guide the arc and high-pressure air generated when the stationary and moving contact assemblies are opened, causing them to flow towards the side away from the moving contact assembly, facilitating arc extinguishing. It also helps to prevent the stationary contact and surrounding components from being damaged, thus improving safety.

[0024] In one possible design, both the stationary contact and the arc-starting element are sealed to the wall of the clearance hole.

[0025] The above scheme ensures that both the stationary contact and the arc-starting component are sealed to the wall of the clearance hole. This isolates the arc-extinguishing chamber from the outside on the side where the stationary contact is located, allowing the arc-extinguishing chamber to enclose and cover the stationary contact, preventing the arc from leaking out from the vicinity of the stationary contact and the arc-starting component, thus improving safety.

[0026] In one possible design, the arc igniter is inclined toward the first arc extinguishing grid in the direction from the stationary contact to the arc igniter, and is spaced apart from the first arc extinguishing grid located at the bottom.

[0027] The above scheme allows the arc-initiating element to be tilted towards the first arc-extinguishing grid in the direction from the stationary contact to the arc-initiating element. In other words, the arc-initiating element directs the electric arc and high-pressure air toward the side where the first arc-extinguishing grid is located, thereby transferring the electric arc. The arc-initiating element has a good guiding and transferring effect on the electric arc and high-pressure air, which improves the arc-extinguishing effect and reduces the occurrence of breakdown failure during the opening process to a certain extent. It also avoids the burning of the stationary contact and improves safety and service life.

[0028] In one possible design, the side of the arc-starting element facing the stationary contact is connected to the conductive element and in contact with the stationary contact, while the side of the arc-starting element facing away from the stationary contact is suspended.

[0029] By employing the above scheme, the arc-initiating component is brought into contact with the stationary contact. This allows the arc generated during circuit breaking to flow rapidly towards the arc-initiating component, facilitating the component's diversion of the arc and high-pressure air towards the side of the arc-extinguishing chamber away from the support, thus improving arc-extinguishing efficiency and effectiveness. Suspending the side of the arc-initiating component away from the stationary contact prevents short circuits and enhances arc-extinguishing safety.

[0030] In one possible design, the cross-section of the arc-initiating element decreases sequentially along the direction from the stationary contact to the arc-initiating element.

[0031] The above scheme forms the arc-initiating element into a trapezoidal structure, with a larger area on the side facing the stationary contact and a smaller area on the side away from the stationary contact. This facilitates arc initiation on a large surface of the arc-initiating element, making arc transfer easier. Furthermore, while guiding the arc, the arc-initiating element also helps the arc to gather together as it flows along the element, resulting in a higher arc density on the smaller surface side. This overcomes the resistance of the arc entering the arc-extinguishing assembly, allowing the arc to enter the first and second arc-extinguishing grid plates more smoothly for extinguishing, thus improving the arc-extinguishing effect.

[0032] In one possible design, the bottom of the support is provided with an insulating protective structure located on the side of the stationary contact away from the arc-initiating element and at least abutting against the side of the conductive element facing the support.

[0033] The above solution involves setting an insulating protective structure at the bottom of the support component. This protective structure is located on the side of the stationary contact away from the arc-initiating component and at least abuts against the side of the conductive component facing the support component. In this way, the protective structure insulates the conductive component on the side of the stationary contact away from the arc-initiating component. The protective structure ensures that the moving contact assembly will not come into contact with the conductive component when the circuit is opened, thereby avoiding the phenomenon of breakdown failure of the stationary contact and the moving contact during the opening process and improving safety.

[0034] In one possible design, the protective structure includes a first protective wall and a second protective wall connected together, the first protective wall abutting against the outer wall of the conductive element facing the support member, and the second protective wall abutting against the outer wall of the conductive element facing the moving contact assembly.

[0035] The above scheme comprises a first protective wall and a second protective wall connected together. The first protective wall abuts against the side of the conductive element facing the support, thus insulating the side of the conductive element facing the support. The second protective wall abuts against the side of the conductive element facing the moving contact assembly, thus insulating the side of the conductive element facing the moving contact assembly. The structure is simple, easy to manufacture, and provides good insulation between the conductive element and the moving contact assembly.

[0036] In one possible design, a support wall is provided at a position corresponding to the top wall of the arc-extinguishing cavity, and the support wall is parallel to and abuts against the top wall of the arc-extinguishing cavity.

[0037] Through the above scheme, a support wall is set on the top of the support component, so that the support wall corresponds to the top wall of the arc-extinguishing cavity, and the support wall and the top wall of the arc-extinguishing cavity are set parallel and abut against each other. That is to say, a support wall is arranged between the part of the top wall of the arc-extinguishing cavity located in the receiving cavity and the shell. The support wall supports and reinforces the top wall of the arc-extinguishing cavity, further improving the structural stability of the top wall of the arc-extinguishing cavity and the protective section on the top wall. This makes the top wall of the arc-extinguishing cavity and the protective section provide better protection for the shell, and further avoids the phenomenon of the shell being broken by electric arc impact.

[0038] Secondly, this application provides a circuit breaker, including a housing and an arc-extinguishing structure as described above disposed within the housing.

[0039] The beneficial effects of the circuit breakers provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0040] Figure 1 This is an isometric view of the arc-extinguishing structure of a circuit breaker according to an embodiment of this application.

[0041] Figure 2 This is an assembly diagram of the arc-extinguishing structure of a circuit breaker according to an embodiment of this application.

[0042] Figure 3 This is an isometric view of the second arc-extinguishing grid plate of the arc-extinguishing structure of the circuit breaker according to an embodiment of this application.

[0043] Figure 4 This is an isometric view of the first arc-extinguishing grid plate of the arc-extinguishing structure of the circuit breaker according to an embodiment of this application.

[0044] Figure 5 This is a first-view isometric view of the arc-extinguishing component of the arc-extinguishing structure of the circuit breaker according to an embodiment of this application.

[0045] Figure 6 This is a second-view axonometric view of the arc-extinguishing component of the circuit breaker arc-extinguishing structure according to an embodiment of this application.

[0046] Figure 7 This is an isometric view of the stationary contact assembly of the arc-extinguishing structure of a circuit breaker according to an embodiment of this application.

[0047] Figure 8 This is a first-view axonometric view of the support member of the arc-extinguishing structure of the circuit breaker according to an embodiment of this application.

[0048] Figure 9 This is a second-view axonometric view of the support member of the arc-extinguishing structure of the circuit breaker according to an embodiment of this application.

[0049] Figure 10 This is a third-view axonometric view of the support member of the arc-extinguishing structure of the circuit breaker according to an embodiment of this application.

[0050] Figure 11 This is an assembly diagram of a circuit breaker according to an embodiment of this application.

[0051] Figure 12 This is another assembly diagram of the circuit breaker described in one embodiment of this application.

[0052] Explanation of reference numerals in the attached drawings: 100, Arc extinguishing structure; 1, Arc extinguishing assembly; 11, First arc extinguishing grid; 12, Second arc extinguishing grid; 121, Protective section; 122, Inclined section; 13, Connecting plate; 14, Arc extinguishing cavity; 2, Support member; 21, Receiving cavity; 22, Clearance hole; 23, Clearance opening; 24, Support wall; 3, Stationary contact assembly; 31, Conductive component; 32, Stationary contact; 33, Arc ignition component; 4, Protective structure; 41, First protective wall; 42, Second protective wall; 51, First connecting part; 52, Second connecting part; 61, First mounting part; 62, Second mounting part; 71, Third mounting part; 72, Fourth mounting part; 8, Protective space; 200, Housing; 300, Moving contact assembly; 301, Moving contact. Detailed Implementation

[0053] 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0055] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0057] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the arc-extinguishing structure of the circuit breaker or the specific structure of the circuit breaker in this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. 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. Therefore, they should not be construed as limitations on this application.

[0058] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0059] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0060] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by screws, bolts, or other spacers; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] refer to Figures 1 to 3 As shown, this embodiment provides a circuit breaker arc extinguishing structure (hereinafter referred to as arc extinguishing structure) 100, which is used to be installed inside the circuit breaker housing 200.

[0062] For details, please refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figures 8 to 10 As shown, the arc-extinguishing structure 100 includes an arc-extinguishing assembly 1 and an insulating support member 2. One side of the support member 2 has a receiving cavity 21. At least a portion of the arc-extinguishing assembly 1 is disposed within the receiving cavity 21. The arc-extinguishing assembly 1 has an arc-extinguishing chamber 14. The top wall of the arc-extinguishing chamber 14 has a protective section 121. The protective section 121 extends in a direction away from the support member 2, and at least a portion of the protective section 121 is exposed outside the receiving cavity 21 and is arranged parallel to the corresponding area of ​​the housing 200. The arc-extinguishing assembly 1 includes a plurality of first arc-extinguishing grids 11 disposed within the arc-extinguishing chamber 14. The plurality of first arc-extinguishing grids 11 extend along the height direction of the support member 2 (see reference). Figure 2 The first arc-extinguishing grid plate 11, which is arranged at intervals in the Z direction, and is located at least near the top wall of the arc-extinguishing cavity 14, has one end facing away from the support member 2 inside the arc-extinguishing cavity 14 and below the protection section 121.

[0063] For specific implementation, refer to Figure 1 , Figure 5 , Figure 6 and Figure 9 As shown, the shape of the receiving cavity 21 matches the shape of the arc extinguishing component 1 facing the support member 2. When the arc extinguishing component 1 is installed in the receiving cavity 21, the arc extinguishing component 1 and the receiving cavity 21 fit well, so that the arc will not flow out from between the two, which facilitates arc extinguishing and helps to improve electrical life.

[0064] Furthermore, the arc-extinguishing component 1 is arranged inside the receiving cavity 21, which provides a certain degree of protection for the arc-extinguishing component 1 and helps to extend its service life.

[0065] By providing a protective section 121 to the top wall of the arc-extinguishing cavity 14, at least a portion of the protective section 121 is exposed outside the receiving cavity 21 and is arranged parallel to the corresponding area of ​​the housing 200. In this way, the protective section 121 isolates the arc-extinguishing cavity 14 and the housing 200, and the housing 200 will not come into contact with the arc inside the arc-extinguishing cavity 14, thus achieving the protection of the housing 200.

[0066] Furthermore, a plurality of first arc-extinguishing grid plates 11 are provided in the arc-extinguishing cavity 14. The plurality of first arc-extinguishing grid plates 11 are arranged at intervals along the height of the support member 2, and at least one of the first arc-extinguishing grid plates 11 near the top wall has one end facing away from the support member 2 located in the arc-extinguishing cavity 14 and below the protective section 121. That is to say, at least one of the uppermost first arc-extinguishing grid plates 11 has one end facing away from the support member 2 located in the arc-extinguishing cavity 14 and below the protective section 121. With this configuration, the area below the protective section 121 and the side of at least the uppermost first arc-extinguishing grid plate 11 in the arc-extinguishing cavity 14 facing away from the support member 2 together form a protective space 8. In this way, the electric arc flowing out from at least the uppermost first arc-extinguishing grid plate 11 will enter the protective space 8 and come into contact with the protective section 121. The electric arc will not come into contact with the housing 200 above the protective section 121. The protective section 121 isolates the housing 200 from the electric arc, thereby preventing the housing 200 from being broken by the electric arc impact. This achieves effective protection for the housing 200 and ensures the service life of the circuit breaker.

[0067] For example, refer to Figure 2 As shown, the top wall of the arc-extinguishing cavity 14 has a protective section 121 extending to the left. This protective section 121 is parallel to the portion of the housing 200 located above the protective section 121, meaning that the protective section 121 is parallel to the housing 200 above it. Multiple first arc-extinguishing grid plates 11 are spaced apart inside the arc-extinguishing cavity 14. The left sides of the two uppermost first arc-extinguishing grid plates 11 are located within the arc-extinguishing cavity 14 and within the protective space 8. In practical use, after the electric arc from the top and bottom of the two uppermost first arc-extinguishing grid plates 11 flows to the left and enters the protective space 8, the electric arc comes into contact with the protective section 121. Due to the blocking effect of the protective section 121, the electric arc will not come into contact with the housing 200 above the protective section 121, thus preventing the housing 200 from being broken by the electric arc impact and achieving protection for the housing 200.

[0068] It should be noted that the end of the first arc-extinguishing grid plate 11 facing away from the support member 2 is located below the protective section 121. Specifically, this can be understood as the end of the first arc-extinguishing grid plate 11 facing away from the support member 2 (refer to...). Figure 2 As shown, the left end of the first arc-extinguishing grid plate 11 is located above the housing 200 (reference) above the protective section 121. Figure 11As shown, the projection on the top wall of the housing 200 is located within the projection area of ​​the protective section 121 on the housing 200 above it. For example, refer to... Figure 11 As shown, the projections of the left ends of the two uppermost first arc-extinguishing grid plates 11 of the arc-extinguishing structure 100 onto the top wall of the housing 200 are both located within the projection area of ​​the protective section 121 onto the top wall of the housing 200.

[0069] The arc-extinguishing structure 100 provided in this embodiment comprises an arc-extinguishing component 1 and an insulating support member 2. A receiving cavity 21 is provided on one side of the support member 2, and at least a portion of the arc-extinguishing component 1 is disposed in the receiving cavity 21. The top wall of the arc-extinguishing cavity 14 of the arc-extinguishing component 1 has a protective section 121. The protective section 121 extends away from the support member 2, and at least a portion of the protective section 121 is exposed outside the receiving cavity 21. The protective section 121 is arranged parallel to the corresponding area of ​​the housing 200. That is, the top wall of the arc-extinguishing cavity 14 has a protective section 121 extending to the outside of the receiving cavity 21, and the protective section 121 is parallel to the corresponding area of ​​the housing 200. The arc extinguishing assembly 1 includes a plurality of first arc extinguishing grid plates 11 disposed within the arc extinguishing cavity 14. The plurality of first arc extinguishing grid plates 11 are arranged at intervals along the height direction of the support member 2. At least one end of the first arc extinguishing grid plate 11 near the top wall of the arc extinguishing cavity 14, facing away from the support member 2, is located inside the arc extinguishing cavity 14 and below the protective section 121. In this arrangement, the protective section 121 separates the arc extinguishing cavity 14 from the housing 200 above the arc extinguishing cavity 14. The protective section 121 and the side of the first arc extinguishing grid plate 11 near the top wall of the arc extinguishing cavity 14 facing away from the support member 2 together form the protective space 8 of the housing 200. That is, the protective section 121 and the side of at least one first arc extinguishing grid plate 11 near it facing away from the support member 2 form the protective space 8.

[0070] In practical use, during the arc extinguishing process, the arc extinguishing assembly 1 isolates the arc from the housing 200 above the arc extinguishing chamber 14 via the protective section 121. Therefore, the arc near the top of the arc extinguishing chamber 14 enters the protective space 8. Even if it comes into contact with the protective section 121, it will not directly impact the housing 200 above the arc extinguishing chamber 14, reducing the possibility of the housing 200 being directly impacted and broken by the arc. Furthermore, because the protective section 121 separates the arc extinguishing chamber 14 from the housing 200 above it, the protective section 121 and the protective space 8 formed below it can buffer the arc, reducing the possibility of the housing 200 being indirectly impacted and broken by the arc during the arc extinguishing process. This effectively protects the housing 200 and ensures the service life of the circuit breaker.

[0071] Meanwhile, the protective section 121 and the protective space 8 formed below it can, to a certain extent, prevent the components on the side of the protective section 121 away from the support member 2 from being punctured, thereby improving the safety of use and further ensuring the service life of the circuit breaker.

[0072] refer to Figure 2 As shown, in some embodiments, the area of ​​the housing 200 corresponding to the protective section 121 is a horizontal plane, and the protective section 121 is a horizontal plane that extends in the horizontal direction away from the support member 2.

[0073] The arc-extinguishing structure of the circuit breaker is 100 as follows Figure 2 Taking the orientation shown as an example, the area of ​​housing 200 corresponding to protective section 121 refers to the area within housing 200 directly above protective section 121. In this embodiment, the horizontal direction and horizontal plane are based on… Figure 2 The description of the placement orientation shown is based on the fact that in actual use, when the placement orientation of the circuit breaker changes, the horizontal direction and horizontal plane will also change accordingly.

[0074] The protective section 121 is designed to be a horizontal plane that matches the corresponding area of ​​the housing 200, making the protective section 121 parallel to the housing 200 above it. This design allows for a smaller size of the protective section 121 while maintaining the same level of protection, compared to a non-parallel design. This reduces the manufacturing cost of the protective section 121.

[0075] refer to Figures 1 to 3 As shown, in some embodiments, a first connecting part 51 is provided on the side wall of the protective section 121, and a second connecting part 52 is provided on the cavity wall of the arc-extinguishing cavity 14. The protective section 121 is connected to the cavity wall of the arc-extinguishing cavity 14 through the first connecting part 51 and the second connecting part 52.

[0076] In other words, the protective section 121 is installed on the cavity wall of the arc-extinguishing chamber 14 through the first connecting part 51 and the second connecting part 52, which is convenient to assemble and has a stable connection. At the same time, it enhances the structural stability of the protective section 121, thereby improving the arc impact resistance of the protective section 121 and further preventing the shell 200 from cracking due to arc impact.

[0077] refer to Figure 1 and Figure 3 As shown, in some embodiments, the first connecting portion 51 includes a connecting protrusion, and the second connecting portion 52 includes a connecting groove into which the connecting protrusion can extend and engage.

[0078] In other words, the protective section 121 is installed on the cavity wall of the arc-extinguishing cavity 14 through the cooperation of the connecting protrusion and the connecting groove. It has a simple structure, is easy to manufacture, and is convenient and stable to connect.

[0079] In practice, the connecting protrusion can be a tenon, and the connecting groove can be a mortise. The tenon and mortise are fixedly riveted together to achieve a rigid connection between the protective section 121 and the cavity wall of the arc extinguishing cavity 14. The connection stability is high, which enhances the protective function of the protective section 121 for the shell 200.

[0080] In other embodiments, the first connecting part is a connecting groove and the second connecting part is a connecting protrusion.

[0081] refer to Figure 3 As shown, in some embodiments, there are at least two first connecting parts 51, which are respectively disposed on both sides of the protective section 121, and at least two second connecting parts 52, which are connected to the first connecting parts 51 in a one-to-one correspondence.

[0082] In other words, multiple first connecting parts 51 are provided on the protective section 121, and the multiple first connecting parts 51 are respectively located on both sides of the protective section 121. Multiple second connecting parts 52 are provided on the cavity wall of the arc extinguishing cavity 14, and one second connecting part 52 is connected to one first connecting part 51. The protective section 121 is installed on the arc extinguishing cavity 14 through the cooperation of multiple sets of first connecting parts 51 and second connecting parts 52, which further improves the structural stability of the protective section 121, thereby further improving the arc impact resistance of the protective section 121 and providing better protection for the shell 200.

[0083] For example, refer to Figure 3 As shown, the protective section 121 is provided with two connecting protrusions, which are located on both sides of the protective section 121. The cavity wall of the arc extinguishing cavity 14 is provided with two connecting grooves. The protective section 121 is installed in the arc extinguishing cavity 14 through the cooperation of the two sets of connecting protrusions and connecting grooves, which makes the connection convenient and stable.

[0084] In some embodiments, reference Figure 1 , Figure 2 and Figure 4 As shown, a first mounting part 61 is provided on the side wall of the first arc-extinguishing grid plate 11, and a second mounting part 62 is provided on the cavity wall of the arc-extinguishing cavity 14. The first arc-extinguishing grid plate 11 is installed in the arc-extinguishing cavity 14 through the cooperation of the first mounting part 61 and the second mounting part 62.

[0085] For specific implementation, refer to Figure 1 and Figure 4 As shown, the first mounting part 61 can be a tenon, and the second mounting part 62 can be a mortise. The first arc-extinguishing grid plate 11 is riveted into the arc-extinguishing cavity 14 by the cooperation of the tenon and the mortise.

[0086] Furthermore, multiple tenons are provided on the side wall of the first arc-extinguishing grid plate 11, and the multiple tenons are respectively located on both sides of the first arc-extinguishing grid plate 11. Correspondingly, multiple tenons are provided on the cavity wall of the arc-extinguishing cavity 14, and the tenons and tenons are connected one-to-one.

[0087] In other embodiments, the first mounting part 61 may be a mortise, for example, and the second mounting part 62 may be a tenon.

[0088] refer to Figure 5 and Figure 6 As shown, in some embodiments, the arc extinguishing assembly 1 includes a second arc extinguishing grid 12 and two opposite and spaced connecting plates 13. The second arc extinguishing grid 12 is disposed between the two connecting plates 13, and both ends of the second arc extinguishing grid 12 are respectively connected to the top of the two connecting plates 13. The second arc extinguishing grid 12 and the two connecting plates 13 together form an arc extinguishing cavity 14. The second arc extinguishing grid 12 is formed as a top wall, and both ends of each first arc extinguishing grid 11 are respectively connected to the two connecting plates 13.

[0089] An arc-extinguishing cavity 14 is formed by two opposing and spaced-apart connecting plates 13 and a second arc-extinguishing grid plate 12 connected to the top of the two connecting plates 13. This structure is simple and easy to manufacture. The second arc-extinguishing grid plate 12 forms the top wall of the arc-extinguishing cavity 14, thus not only does the top wall of the arc-extinguishing cavity 14 have an arc-extinguishing function, but it also buffers the electric arc and isolates it from the housing 200, thereby protecting the housing 200.

[0090] It is understandable that the side of the second arc-extinguishing grid plate 12 facing away from the receiving cavity 21 has a protective section 121 extending to the outside of the receiving cavity 21. While extinguishing the arc, the second arc-extinguishing grid plate 12 can also protect the housing 200, preventing the housing 200 from being damaged by the electric arc.

[0091] In some embodiments, reference Figure 1 and Figure 3 As shown, a third mounting part 71 is provided on the side wall of the second arc-extinguishing grid plate 12, and a fourth mounting part 72 is provided on the cavity wall of the arc-extinguishing cavity 14. The second arc-extinguishing grid plate 12 is installed in the arc-extinguishing cavity 14 through the cooperation of the third mounting part 71 and the fourth mounting part 72.

[0092] For specific implementation, refer to Figure 1 and Figure 3 As shown, the third mounting part 71 can be a tenon, the fourth mounting part 72 can be a mortise, and the second arc-extinguishing grid plate 12 is riveted into the arc-extinguishing cavity 14 by the cooperation of the tenon and the mortise.

[0093] Furthermore, multiple tenons are provided on the side wall of the second arc-extinguishing grid plate 12, and the multiple tenons are respectively located on both sides of the second arc-extinguishing grid plate 12. Correspondingly, multiple mortises are provided on the cavity wall of the arc-extinguishing cavity 14, and the tenons and mortises are connected one-to-one.

[0094] In other embodiments, the third mounting part 71 may be a mortise, for example, and the fourth mounting part 72 may be a tenon.

[0095] refer to Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments, the two bottommost first arc-extinguishing grid plates 11 are fitted together.

[0096] Since the stationary contact assembly 3 of the circuit breaker is located inside the arc extinguishing cavity 14 and below all the first arc extinguishing grid plates 11, the two lowest first arc extinguishing grid plates 11 are fitted together, so that the two lowest first arc extinguishing grid plates 11 combine to form a thicker arc extinguishing grid plate, which is closer to the arc ignition point, making it easier to extinguish the arc. It also improves the structural strength and burn resistance, reduces the occurrence of arc breakdown to a certain extent, and helps to extend the service life of the arc extinguishing assembly 1.

[0097] In other embodiments, the thickness of the bottommost first arc-extinguishing grid plate 11 is greater than the thickness of the other first arc-extinguishing grid plates 11. For example, the thickness of the bottommost first arc-extinguishing grid plate 11 is twice the thickness of the other first arc-extinguishing grid plates 11. This makes the bottommost first arc-extinguishing grid plate 11 closer to the arc-starting point, which is convenient for arc extinguishing, and its structural strength and fire resistance are also higher.

[0098] refer to Figure 2 , Figures 7 to 10 As shown, in some embodiments, the circuit breaker arc extinguishing structure 100 further includes a stationary contact assembly 3; the stationary contact assembly 3 includes a conductive element 31, a stationary contact 32, and a conductive arc-inducing element 33. The conductive element 31 is disposed at the bottom of the support member 2. The stationary contact 32 and the arc-inducing element 33 are both disposed on the side of the conductive element 31 facing the support member 2. The bottom of the support member 2 is provided with a clearance hole 22 for the stationary contact 32 and the arc-inducing element 33 to be exposed in the arc extinguishing cavity 14. The stationary contact 32 is disposed on the side close to the moving contact assembly 300 inside the housing 200. The arc-inducing element 33 is located on the side of the stationary contact 32 away from the moving contact assembly 300.

[0099] By including a conductive element 31, a stationary contact 32, and an arc-starting element 33 in the stationary contact assembly 3, the stationary contact 32 and the arc-starting element 33 are disposed at the bottom of the support member 2 via the conductive element 31, making assembly convenient. Since the bottom of the support member 2 has a clearance hole 22 for the stationary contact 32 and the arc-starting element 33 to be exposed within the arc-extinguishing cavity 14, after the conductive element 31 is connected to the support member 2, the stationary contact 32 and the arc-starting element 33 are exposed within the arc-extinguishing cavity 14. Furthermore, the arc-starting element 33 is located on the side of the stationary contact 32 facing away from the moving contact assembly 300. This allows the arc-starting element 33 to guide the arc and high-pressure air generated when the stationary contact 32 and the moving contact assembly 300 separate, causing the arc and high-pressure air to flow towards the side facing away from the moving contact assembly 300 under the guidance of the arc-starting element 33, facilitating arc extinguishing. It also helps to prevent the stationary contact 32 and its surrounding components from being punctured, thus improving safety.

[0100] The moving contact assembly 300 includes a moving contact 301. The moving contact assembly 300 is rotatable relative to the housing 200 toward the arc-extinguishing structure 100, so that the moving contact 301 contacts the stationary contact 32 to achieve closing. Alternatively, it can rotate toward a direction away from the arc-extinguishing structure 100, so that the moving contact 301 separates from the stationary contact 32 to achieve opening.

[0101] For specific implementation, refer to Figure 1 , Figure 2 , Figure 6 and Figure 9 As shown, the support member 2 has a clearance opening 23 on the side opposite to the receiving cavity 21, which allows the moving contact assembly 300 to extend into or be removed from the arc extinguishing cavity 14. The structure is simple and easy to use.

[0102] In some embodiments, both the stationary contact 32 and the arc-starting element 33 are sealed to the wall of the clearance hole 22.

[0103] By sealing both the stationary contact 32 and the arc-starting element 33 with the wall of the clearance hole 22, the arc-extinguishing cavity 14 can be separated from the outside on the side where the stationary contact 32 is located. This allows the arc-extinguishing cavity 14 to wrap and cover the stationary contact 32, preventing the arc from leaking out from the vicinity of the stationary contact 32 and the arc-starting element 33, thus improving safety.

[0104] refer to Figure 2 and Figure 7 As shown, in some embodiments, in the direction from the stationary contact 32 to the arc-inducing member 33, the arc-inducing member 33 is inclined toward the direction of the first arc-extinguishing grid 11 and is spaced apart from the first arc-extinguishing grid 11 located at the bottom.

[0105] By tilting the arc-initiating element 33 towards the direction close to the first arc-extinguishing grid plate 11 along the direction from the stationary contact 32 to the arc-initiating element 33, that is, the arc-initiating element 33 guides the electric arc and high-pressure air toward the side where the first arc-extinguishing grid plate 11 is located, thereby achieving the transfer of the electric arc. The arc-initiating element 33 has a good guiding and transfer effect on the electric arc and high-pressure air, which improves the arc extinguishing effect and reduces the occurrence of breakdown failure during the opening process to a certain extent. It also avoids the burning of the stationary contact 32 and improves safety and service life.

[0106] refer to Figure 2 As shown, in some embodiments, the side of the arc-starting member 33 facing the stationary contact 32 is connected to the conductive member 31 and contacts the stationary contact 32, while the side of the arc-starting member 33 away from the stationary contact 32 is suspended.

[0107] By bringing the arc-initiating element 33 into contact with the stationary contact 32, the arc generated during circuit breaking can quickly flow to the arc-initiating element 33. This facilitates the arc-initiating element 33 guiding the arc and high-pressure air to the side of the arc-extinguishing chamber 14 away from the support member 2, thus improving arc-extinguishing efficiency and effect. Suspending the side of the arc-initiating element 33 away from the stationary contact 32 prevents short circuits and improves arc-extinguishing safety.

[0108] refer to Figure 7 As shown, the arc-initiating element 33 extends along the dashed line L in a direction away from the stationary contact 32, and the dashed line L is the extension line of the arc-initiating element 33.

[0109] refer to Figure 2 and Figure 7 As shown, in some embodiments, the cross-section of the arc-inducing member 33 decreases sequentially in the direction from the stationary contact 32 to the arc-inducing member 33.

[0110] It should be noted that the cross-section of the arc-starting element 33 can be understood as the cross-section obtained by cutting the arc-starting element 33 with a plane perpendicular to the extension line of the arc-starting element 33.

[0111] By making the cross-section of the arc-initiating element 33 decrease sequentially along the direction from the stationary contact 32 to the arc-initiating element 33, the arc-initiating element 33 can be formed into a trapezoidal structure. The area of ​​the arc-initiating element 33 facing the stationary contact 32 is larger, while the area of ​​the arc-initiating element 33 away from the stationary contact 32 is smaller. This facilitates arc initiation over a large area of ​​the arc-initiating element 33, making arc transfer easier. Furthermore, while guiding the arc, the arc-initiating element 33 also helps the arc to concentrate as it flows along the arc-initiating element 33, resulting in a higher arc density on the smaller side of the arc-initiating element 33. This overcomes the resistance of the arc entering the arc-extinguishing assembly 1, allowing the arc to enter the first arc-extinguishing grid plate 11 and the second arc-extinguishing grid plate 12 more smoothly for arc extinguishing, thus improving the arc extinguishing effect.

[0112] refer to Figure 2As shown, in some embodiments, the bottom of the support member 2 is provided with an insulating protective structure 4, which is located on the side of the stationary contact 32 away from the arc-inducing member 33 and at least abuts against the side of the conductive member 31 facing the support member 2.

[0113] By providing an insulating protective structure 4 at the bottom of the support member 2, the protective structure 4 is located on the side of the stationary contact 32 away from the arc-starting member 33 and at least abuts against the side of the conductive member 31 facing the support member 2. In this way, the protective structure 4 provides insulation for the conductive member 31 located on the side of the stationary contact 32 away from the arc-starting member 33. The protective structure 4 ensures that the moving contact assembly 300 will not come into contact with the conductive member 31 when the circuit is opened, thereby avoiding the phenomenon of breakdown failure of the stationary contact 32 and the moving contact 301 during the opening process and improving safety.

[0114] refer to Figure 2 , Figure 9 and Figure 10 As shown, in some embodiments, the protective structure 4 includes a first protective wall 41 and a second protective wall 42 connected together. The first protective wall 41 abuts against the outer wall of the conductive member 31 on the side facing the support member 2, and the second protective wall 42 abuts against the outer wall of the conductive member 31 on the side facing the moving contact assembly 300.

[0115] By including a connected first protective wall 41 and a second protective wall 42 in the protective structure 4, the structure is simple and easy to manufacture. Specifically, the first protective wall 41 abuts against the side of the conductive element 31 facing the support member 2, and the side of the conductive element 31 facing the support member 2 is insulated. (Refer to...) Figure 2 As shown, the first protective wall 41 is located on the side of the stationary contact 32 away from the arc-starting member 33 and abuts against the top wall of the conductive member 31. The first protective wall 41 provides insulation for the top surface of the conductive member 31.

[0116] The second protective wall 42 abuts against the side of the conductive element 31 facing the moving contact assembly 300, thus insulating the side of the conductive element 31 facing the moving contact assembly 300. (Refer to...) Figure 2 As shown, the second protective wall 42 is connected to the side of the first protective wall 41 away from the stationary contact 32 and extends downwards. The second protective wall 42 is insulated from the right side wall of the conductive element 31.

[0117] The protective structure 4 is configured as a first protective wall 41 and a second protective wall 42 connected together. The first protective wall 41 and the second protective wall 42 respectively insulate the side of the conductive element 31 facing the support and the side of the conductive element 31 facing the moving contact assembly 300. In this way, the protective structure 4 can simultaneously insulate the two outer walls of the conductive element 31, thereby achieving a better insulation effect between the conductive element 31 and the moving contact assembly 300.

[0118] In a specific implementation, the first protective wall 41 and the second protective wall 42 can be perpendicular, forming a right-angled protective structure 4. When the conductive element 31 is connected to the bottom of the support 2, the first protective wall 41 and the second protective wall 42 respectively abut against the side wall of the conductive element 31 facing the support 2 and the side wall of the conductive element 31 facing the moving contact assembly 300 (see reference). Figure 2 As shown, the first protective wall 41 and the second protective wall 42 abut against the top wall and the right side wall of the conductive component 31, respectively, which facilitates assembly.

[0119] The first protective wall 41 and the second protective wall 42 can be integrally formed, resulting in good integrity and high structural strength. Alternatively, in other implementations, the first protective wall 41 and the second protective wall 42 can be connected together by welding.

[0120] In other embodiments, the protective structure may include only a first protective wall located on the side of the stationary contact away from the arc-inducing member, and the first protective wall abutting against the side of the conductive member 31 facing the support member 2.

[0121] refer to Figure 1 , Figure 2 and Figure 9 As shown, in some embodiments, a support wall 24 is provided at a position corresponding to the top wall of the arc-extinguishing cavity 14 on the support member 2, and the support wall 24 is parallel to and abuts against the top wall of the arc-extinguishing cavity 14.

[0122] By providing a support wall 24 on the top of the support member 2, the support wall 24 corresponds to the top wall of the arc-extinguishing cavity 14, and is arranged parallel to and abuts against the top wall of the arc-extinguishing cavity 14. In other words, the support wall 24 is arranged between the portion of the top wall of the arc-extinguishing cavity 14 located in the receiving cavity 21 and the shell 200. With this arrangement, when an electric arc impacts the top wall of the arc-extinguishing cavity 14, the support wall 24 provides support and structural reinforcement, further improving the structural stability of the top wall of the arc-extinguishing cavity 14 and the protective section 121 on the top wall. This results in better protection of the shell 200 by the top wall of the arc-extinguishing cavity 14 and the protective section 121, further preventing the shell 200 from cracking due to electric arc impact.

[0123] For example, refer to Figure 2 and Figure 3As shown, in the direction from left to right, the second arc-extinguishing grid 12 includes a connected protective section 121 and an inclined section 122, the inclined section 122 being inclined towards the arc-extinguishing cavity 14 in the direction from left to right. Correspondingly, the support wall 24 at the top of the support member 2 has an inclined wall that matches the inclined section 122, and the inclined wall of the support wall 24 is parallel to and abuts against the inclined section 122 of the second arc-extinguishing grid 12. With this arrangement, when an electric arc impacts the inclined section 122 of the second arc-extinguishing grid 12, the inclined wall of the support wall 24 can provide support and structural reinforcement for the inclined section 122 of the second arc-extinguishing grid 12.

[0124] refer to Figures 1 to 12 As shown, this embodiment provides a circuit breaker, which includes a housing 200 and an arc-extinguishing structure 100 disposed inside the housing 200.

[0125] The arc extinguishing structure 100 includes a stationary contact assembly 3, which includes a stationary contact 32; a moving contact assembly 300 is also provided inside the housing 200, which includes a moving contact 301 that can contact or detach from the stationary contact 32.

[0126] The moving contact assembly 300 is rotatably connected to the housing 200. The moving contact assembly 300 can rotate relative to the housing 200 toward the direction closer to the stationary contact 32, so that the moving contact 301 and the stationary contact 32 make contact to close the circuit and realize electrical conduction. The moving contact assembly 300 can also rotate relative to the housing 200 toward the direction away from the stationary contact 32, so that the moving contact 301 and the stationary contact 32 are disengaged from the circuit and the electrical conduction is released, thereby protecting the circuit and electrical equipment.

[0127] The arc-extinguishing structure in this embodiment has the same structure and implementation principle as the arc-extinguishing structure provided in the above embodiments, and can bring the same or similar technical effects. It will not be described in detail here, but can be referred to the description of the above embodiments.

Claims

1. An arc chute for installation within a housing of a circuit breaker, comprising: The circuit breaker arc extinguishing structure comprises an arc extinguishing assembly and an insulated support; One side of the support is provided with a containing cavity, at least part of the arc extinguishing assembly is arranged in the containing cavity, the arc extinguishing assembly is provided with an arc extinguishing cavity, a top wall of the arc extinguishing cavity is provided with a protection section, the protection section extends away from the support, at least part of the protection section is exposed outside the containing cavity and is arranged in parallel with a corresponding area of the shell; The arc extinguishing assembly comprises a plurality of first arc extinguishing vanes arranged in the arc extinguishing cavity, the plurality of first arc extinguishing vanes are arranged in the height direction of the support, and at least one end of a first arc extinguishing vane close to the top wall, away from the support, is arranged in the arc extinguishing cavity and below the protection section.

2. The circuit breaker arc extinguishing structure of claim 1, wherein The corresponding area of the shell corresponding to the protection section is a horizontal plane, and the protection section is a horizontal plane arranged in the horizontal direction and extending away from the support.

3. The circuit breaker arc extinguishing structure of claim 1, wherein A first connecting part is arranged on the side wall of the protection section, a second connecting part is arranged on the cavity wall of the arc extinguishing cavity, and the protection section is connected with the cavity wall of the arc extinguishing cavity through the first connecting part and the second connecting part.

4. The circuit breaker arc extinguishing structure of claim 3, wherein, The first connecting part comprises a connecting convex, and the second connecting part comprises a connecting groove into which the connecting convex is inserted; And / or, the first connecting part is at least two, at least two first connecting parts are arranged on both sides of the protection section, the second connecting part is at least two, and the second connecting part is connected with the first connecting part one by one.

5. The circuit breaker arc mitigation structure of claim 1, wherein, The arc extinguishing assembly comprises a second arc extinguishing vane and two opposite and spaced connecting plates, the second arc extinguishing vane is arranged between the two connecting plates, and two ends of the second arc extinguishing vane are connected with the top of the two connecting plates respectively, the second arc extinguishing vane and the two connecting plates jointly enclose the arc extinguishing cavity, the second arc extinguishing vane forms the top wall, and two ends of each first arc extinguishing vane are connected with the two connecting plates respectively; And / or, the two first arc extinguishing vanes at the lowermost position are arranged in close contact.

6. The circuit breaker arc extinguishing structure according to any one of claims 1 to 5, characterized in that, The circuit breaker arc extinguishing structure further comprises a static contact assembly; The static contact assembly comprises a conductive part, a static contact point and a conductive arc leading part, the conductive part is arranged at the bottom of the support, the static contact point and the arc leading part are arranged on the side of the conductive part facing the support, the bottom of the support is provided with a avoiding hole for the static contact point and the arc leading part to be exposed in the arc extinguishing cavity, the static contact point is arranged close to the side of the shell where the movable contact assembly is located, and the arc leading part is located on the side of the static contact point away from the movable contact assembly.

7. The circuit breaker arc extinguishing structure of claim 6, wherein, The static contact point and the arc leading part are both arranged in sealing connection with the hole wall of the avoiding hole; And / or, in the direction from the static contact point to the arc leading part, the arc leading part is arranged in an inclined manner towards the direction close to the first arc extinguishing vane and is arranged in spaced connection with the first arc extinguishing vane at the lowermost position; And / or, the side of the arc leading part facing the static contact point is connected with the conductive part and in contact with the static contact point, and the side of the arc leading part away from the static contact point is arranged in suspension. And / or, in the direction from the static contact to the arc striking element, the cross section of the arc striking element is successively reduced.

8. The circuit breaker arc extinguishing structure of claim 6, wherein, The bottom of the support is provided with an insulating protection structure, which is located on the side of the static contact away from the arc striking element and at least abuts with the side of the conductive element facing the support.

9. The circuit breaker arc extinguishing structure according to any one of claims 1 to 5, characterized in that, The support is provided with a support wall at the position corresponding to the top wall of the arc extinguishing chamber, which is parallel to and abuts with the top wall of the arc extinguishing chamber.

10. A circuit breaker characterized by, The circuit breaker arc extinguishing structure as claimed in any one of claims 1 to 9 is included in a housing.

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