A circuit breaker

Abstract

This application provides a circuit breaker, belonging to the field of electrical equipment technology. The circuit breaker includes a base, a stationary contact, an arc-extinguishing chamber, and an arc-extinguishing shielding assembly. The base includes a base plate. The stationary contact includes a first end and a second end, with the first end fixedly connected to the base plate. A portion of the arc-extinguishing chamber is located on the side of the stationary contact away from the base plate, and the second end is located within the arc-extinguishing chamber. The arc-extinguishing shielding assembly includes an arc-extinguishing cover and a stationary cover. The stationary cover is disposed on the second end, shielding the area of ​​the arc-extinguishing chamber near the stationary contact, while the arc-extinguishing cover is disposed on the area of ​​the arc-extinguishing chamber away from the stationary contact. The arc-extinguishing shielding assembly designed in this application can confine the arc within the effective operating area of ​​the arc-extinguishing chamber, thus reducing the erosion of the stationary contact and arc-extinguishing chamber by the arc generated during the circuit breaker's breaking process, thereby improving the reliability of the arc-extinguishing system. The modular design of the arc-extinguishing cover and stationary cover allows adjustment of the circuit breaker's protection level according to actual operating conditions, optimizing cost structure while ensuring breaking performance.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and more particularly to a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Circuit breakers are equipped with an arc-extinguishing system, which typically includes moving contacts, stationary contacts, and an arc-extinguishing chamber.

[0003] When a circuit breaker interrupts current under abnormal circuit conditions, the moving contact separates from the stationary contact. At this time, an electric arc is generated between the moving and stationary contacts, which is extinguished by the arc-extinguishing system of the circuit breaker. However, the reliability of the arc-extinguishing system in the current technology is relatively low. Utility Model Content

[0004] This application provides a circuit breaker to improve the reliability of arc extinguishing systems.

[0005] In a first aspect, this application provides a circuit breaker. The circuit breaker includes a base, a stationary contact, an arc-extinguishing chamber, and an arc-extinguishing shielding assembly. The base includes a base plate. The stationary contact is located on the base plate and includes a first end and a second end positioned opposite each other, the first end being fixedly connected to the base plate. The arc-extinguishing chamber is disposed on the base plate, with a portion of the arc-extinguishing chamber located on the side of the stationary contact away from the base plate, and the second end located within the arc-extinguishing chamber. The arc-extinguishing shielding assembly includes an arc-extinguishing cover and a stationary cover, with one end of the arc-extinguishing cover facing the stationary cover contacting the other end of the stationary cover facing the arc-extinguishing cover. The stationary cover is disposed on the second end, and simultaneously shields the area of ​​the arc-extinguishing chamber near the stationary contact, while the arc-extinguishing cover is disposed on the area of ​​the arc-extinguishing chamber away from the stationary contact.

[0006] Through the above-described scheme, the arc-extinguishing shielding assembly designed in this application can confine the arc to the arc-extinguishing area of ​​the arc-extinguishing chamber. This reduces the erosion of the stationary contacts and arc-extinguishing chamber by the arc generated during the circuit breaker's breaking process, thereby improving the reliability of the arc-extinguishing system. The arc-extinguishing shielding assembly is designed as a combination of a stationary cover and an arc-extinguishing cover. This not only retains the original function of the arc-extinguishing shielding assembly but also allows for selection of the stationary cover to be used alone or in conjunction with the arc-extinguishing cover, depending on the breaking requirements of the circuit breaker. This modular design allows for adjustment of the protection level according to actual operating conditions, optimizing the cost structure while ensuring breaking performance.

[0007] In one possible design, the arc-extinguishing shroud has an extension section on the side near the stationary shroud. The side of the stationary shroud facing the first end abuts against the extension section to limit the arc-extinguishing shroud, preventing it from moving away from the arc-extinguishing chamber.

[0008] With the above scheme, the side of the stationary cover facing the first end abuts against the extension section. The positioning of the arc extinguishing cover can be achieved simply by the structural cooperation between the stationary cover and the arc extinguishing cover. This can effectively prevent the arc extinguishing cover from being displaced due to arc impact or mechanical vibration during the circuit breaker breaking process, thereby maintaining the integrity of the arc extinguishing shielding assembly and improving the reliability of the arc extinguishing system.

[0009] In one possible design, the circuit breaker further includes a moving contact, which is rotatably mounted within the base, with its second end located along its rotational trajectory. A first baffle is provided on the base plate, positioned on the side of the second end away from the first end, and has a clearance groove for the moving contact to move. A first limiting block is provided on the side of the first baffle facing the second end, located at the edge of the clearance groove. The arc-extinguishing shield has a first limiting groove on the side facing the first baffle, and the first limiting block is located within the first limiting groove. A stop block is provided on the side of the stationary shield facing the first baffle, abutting against the side of the first limiting block away from the clearance groove.

[0010] Through the above solution, this application reduces the swaying problem caused by the lack of limiting devices on the arc-extinguishing chamber and the stationary chamber. When the circuit breaker is subjected to vibration or impact, the displacement of the arc-extinguishing chamber and the stationary chamber is limited by the first limiting block, which can reduce the problem of the moving contact being obstructed due to the displacement blocking groove of the arc-extinguishing chamber and / or the stationary chamber. When the rotation of the moving contact in the groove is undisturbed, the reliability of the circuit breaker's breaking and closing processes can be improved, thereby improving the reliability of the circuit breaker in use.

[0011] In one possible design, the arc-extinguishing chamber includes two side plates and multiple arc-extinguishing grids. The two side plates are symmetrically arranged with a gap between them, and the multiple arc-extinguishing grids are spaced apart within the gap. Each of the two side plates has a slot near the bottom plate, and a locking block is provided on the bottom plate, with the locking block located within the slot.

[0012] Through the above-described scheme, this application can effectively limit the displacement of the arc-extinguishing chamber. The symmetrically arranged two side plates can reduce the displacement problem of the arc-extinguishing grid plates caused by structural instability, ensuring that the arc can be uniformly divided and cooled. The mechanical interlocking of the slot and the block further enhances the connection stability between the arc-extinguishing chamber and the base plate, reducing the probability of displacement of the arc-extinguishing chamber caused by arc impact when the circuit breaker is disconnected, thereby improving the reliability of the arc-extinguishing system.

[0013] In one possible design, the side plate away from the base plate has a second limiting groove, and the arc-extinguishing cover away from the stationary cover has a second limiting block, which is located within the second limiting groove. The stationary cover has a hook on the side facing the stationary contact, and the hook engages with the stationary contact.

[0014] Through the above scheme, the interlocking relationship between the second limiting groove and the second limiting block ensures that the arc-extinguishing cover is limited by the side plate after installation, thereby reducing the probability of the arc-extinguishing cover falling off the arc-extinguishing chamber when it shakes due to arc impact or mechanical vibration. The hook engages with the stationary contact, rigidly fixing the stationary cover to the stationary contact and preventing the stationary cover from shifting due to high arc temperature or airflow during the breaking process. The two sets of structures respectively utilize the top of the arc-extinguishing chamber and the stationary contact to constrain the arc-extinguishing shielding assembly, forming a dual limiting mechanism to ensure the relative position of the arc-extinguishing shielding assembly with the arc-extinguishing chamber and the stationary contact remains stable. This improves the reliability of the arc-extinguishing system.

[0015] In one possible design, a pad is provided on the base plate, and a second end is located on the pad. The second end is provided with a flow guide groove, and an insert is provided on the side of the pad facing the second end. The insert is located inside the flow guide groove and contacts the groove wall.

[0016] Through the above scheme, the pad is fixedly connected to the base plate to form a basic support platform. The second end of the stationary contact is entirely supported by the surface of the pad. When the circuit breaker breaks, the mechanical impact force borne by the stationary contact can be dispersed and transmitted to the base plate through the pad, thus improving the impact resistance of the stationary contact. The channel wall of the guide groove forms a surface contact constraint with the insert block, allowing the base plate to limit the stationary contact through the pad, thereby improving the installation stability of the stationary contact. When the installation stability of the stationary contact is improved, the installation stability of the stationary cover will also be improved, which in turn improves the installation stability of the arc extinguishing cover. Thus, when the installation stability of the arc extinguishing shield assembly is improved, the reliability of the arc extinguishing system can be enhanced.

[0017] In one possible design, the circuit breaker also includes a center cover that is mounted on the base. A first abutment block is provided on the side of the center cover facing the base, and the first abutment block abuts against the end of the side plate away from the base plate.

[0018] With the above solution, the end of the side plate furthest from the base plate is blocked by the first abutment block, preventing it from moving along the arrangement direction of the middle cover and the base. This ensures that the arc-extinguishing grid plates remain parallel under the constraint of the side plate. Consequently, the overall structural stability of the arc-extinguishing chamber is enhanced, reducing the problem of reduced arc-extinguishing efficiency due to misalignment of the arc-extinguishing grid plates, and thus improving the reliability of the arc-extinguishing system.

[0019] In one possible design, a second abutment block is provided on the side of the middle cover facing the base, and the second abutment block is located on one side of the first abutment block. The second abutment block abuts against the side of the arc-extinguishing shroud facing the middle cover.

[0020] The above solution reduces the displacement of the arc-extinguishing shroud in the alignment direction of the middle cover and the base. Since the arc-extinguishing shroud is mounted on the arc-extinguishing chamber, when the shroud is positioned, the arc-extinguishing chamber is also positioned, thus improving the installation stability of the arc-extinguishing chamber. This, in turn, improves the reliability of the arc-extinguishing system.

[0021] In one possible design, a second baffle is provided on the side of the middle cover facing the base, and the second baffle is positioned opposite the first baffle. The end of the second baffle facing the first baffle abuts against the end of the first baffle facing the second baffle.

[0022] With the above scheme, the end of the second baffle facing the first baffle abuts against the end of the first baffle facing the second baffle, which can form a continuous barrier between the second baffle and the first baffle. This not only blocks the path of the arc spreading away from the arc-extinguishing chamber, forcing the arc to be confined within the space where the arc-extinguishing chamber is located, but also increases the air pressure inside the cavity where the arc-extinguishing chamber is located. This can improve the breaking capacity of the circuit breaker and thus improve the reliability of the arc-extinguishing system.

[0023] In one possible design, the second baffle is equipped with reinforcing ribs.

[0024] Through the above scheme, when the second baffle is subjected to arc impact during the circuit breaker's breaking process, the addition of reinforcing ribs can increase the moment of inertia of the baffle section, disperse local stress concentration, and thus suppress the bending deformation of the second baffle caused by heat or mechanical impact. This ensures the integrity of the cavity containing the arc-extinguishing chamber, reduces gas leakage during circuit breaker breaking, thereby improving the breaking capacity of the circuit breaker and ultimately enhancing the reliability of the arc-extinguishing system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the circuit breaker provided in the embodiments of this application.

[0026] Figure 2 This is an assembly diagram of the arc-extinguishing chamber and arc-extinguishing shielding assembly provided in an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of the structure of the stationary contact provided in an embodiment of this application.

[0028] Figure 4 This is a schematic diagram of the arc-extinguishing shield provided in an embodiment of this application.

[0029] Figure 5 This is a schematic diagram of the static cover provided in an embodiment of this application.

[0030] Figure 6 This is an assembly diagram of the arc-extinguishing shield and the static shield provided in the embodiments of this application.

[0031] Figure 7 This is a schematic diagram of the structure of the base provided in an embodiment of this application.

[0032] Figure 8 for Figure 7 A magnified view of section A.

[0033] Figure 9 This is a schematic diagram of the arc-extinguishing chamber provided in an embodiment of this application.

[0034] Figure 10 This is an assembly diagram of the stationary cover and stationary contact provided in an embodiment of this application.

[0035] Figure 11 This is a schematic diagram of the structure of the cover provided in an embodiment of this application.

[0036] Explanation of reference numerals in the attached figures: 100. Base; 110. Base plate; 120. First baffle; 121. Clearance groove; 122. First limit block; 130. Locking block; 140. Pad block; 141. Insert block; 200, stationary contact; 210, first end; 220, second end; 221, flow guide groove; 300. Arc-extinguishing chamber; 310. Side plate; 311. Slot; 320. Arc-extinguishing grid plate; 330. Second limiting slot; 340. Groove; 400. Arc extinguishing shield; 410. Extension section; 420. First limiting groove; 430. Second limiting block; 440. Protrusion; 500. Static cover; 510. Stop block; 520. Hook; 600. Moving contact; 700, middle cover; 710, first abutment block; 720, second abutment block; 730, second baffle; 731, reinforcing rib. Detailed Implementation

[0037] 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.

[0038] 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 belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0039] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and drawings of this application are intended to cover without excluding other meanings. The words "a" or "an" do not exclude the presence of multiples.

[0040] 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.

[0041] 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 represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0042] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of 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," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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.

[0043] 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.

[0044] 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 fasteners, such as a connection secured by screws, bolts, or other fasteners; 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.

[0045] In existing technologies, the arc-extinguishing chamber of circuit breakers lacks an effective limiting structure, which makes it prone to swaying during the arc-extinguishing process, affecting the arc-extinguishing effect. The arc-extinguishing chamber and stationary contacts are exposed to the arc environment, and the arc directly burns the arc-extinguishing grid and contact surface during disconnection, resulting in a reduction in component life and consequently reducing the reliability of the circuit breaker.

[0046] To address the aforementioned problems, this application provides a circuit breaker. To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0047] Figure 1 This is a schematic diagram of the overall structure of the circuit breaker provided in the embodiments of this application. Figure 2 This is an assembly diagram of the arc-extinguishing chamber and arc-extinguishing shielding assembly provided in an embodiment of this application. Figure 3 This is a schematic diagram of the structure of the stationary contact provided in an embodiment of this application. Figure 4 This is a schematic diagram of the arc-extinguishing shield provided in an embodiment of this application. Figure 5 This is a schematic diagram of the structure of the static shield provided in an embodiment of this application. Figures 1 to 5 As shown, this application provides a circuit breaker. The circuit breaker includes a base 100, a stationary contact 200, an arc-extinguishing chamber 300, and an arc-extinguishing shielding assembly. The base 100 includes a base plate 110. The stationary contact 200 is located on the base plate 110 and includes a first end 210 and a second end 220 positioned opposite each other. The first end 210 is fixedly connected to the base plate 110. The arc-extinguishing chamber 300 is disposed on the base plate 110, with a portion of the arc-extinguishing chamber 300 located on the side of the stationary contact 200 away from the base plate 110, and the second end 220 located within the arc-extinguishing chamber 300. The arc-extinguishing shielding assembly includes an arc-extinguishing cover 400 and a stationary cover 500, with the end of the arc-extinguishing cover 400 facing the stationary cover 200 in contact with the end of the stationary cover 200 facing the arc-extinguishing cover 400. A stationary cover 500 is installed at the second end 220, and the stationary cover 500 also shields the area of ​​the arc-extinguishing chamber 300 near the stationary contact 200. An arc-extinguishing cover 400 is installed in the area of ​​the arc-extinguishing chamber 300 away from the stationary contact 200.

[0048] Among them, the base 100 refers to the base structure that supports the core components of the circuit breaker, and the base plate 110 serves as the mounting surface for fixing the stationary contact 200 and the arc-extinguishing chamber 300.

[0049] The stationary contact 200 refers to the fixed contact component for current transmission. Specifically, it can be formed by stamping copper alloy sheet. The first end 210 of the stationary contact 200 can be rigidly connected to the base plate 110 by bolts to ensure conductivity stability.

[0050] An arc-extinguishing shielding assembly is an important component used to enhance the arc-extinguishing capability of a circuit breaker, protect its internal components, and improve its electrical performance. The arc-extinguishing shielding assembly includes a stationary cover 500 and an arc-extinguishing cover 400. The stationary cover 500 can be injection molded from high-temperature resistant ceramic material and can simultaneously cover the second end 220 of the stationary contact 200 and the area of ​​the arc-extinguishing chamber 300 near the stationary contact 200. The arc-extinguishing cover 400 can be made of insulating resin material and can cover the area of ​​the arc-extinguishing chamber 300 away from the stationary contact 200. Thus, the stationary cover 500 and the arc-extinguishing cover 400 work together to form continuous protection within the circuit breaker.

[0051] Specifically, the second end 220 of the stationary contact 200 can extend into the interior of the arc-extinguishing chamber 300 to form an arc initiation point. The arc-extinguishing chamber 300 can be positioned above the second end 220 of the stationary contact 200 to form an arc expansion space. The stationary cover 500 can simultaneously cover the second end 220 of the stationary contact 200 and the area of ​​the arc-extinguishing chamber 300 near the stationary contact 200, preventing the arc from eroding the second end 220 of the stationary contact 200 at the moment the circuit breaker breaks, and simultaneously guiding the arc into the interior of the arc-extinguishing chamber 300. The arc-extinguishing cover 400 is positioned over the area of ​​the arc-extinguishing chamber 300 away from the stationary contact 200, protecting this area.

[0052] In summary, the arc-extinguishing shielding assembly designed in this application can confine the arc to the arc-extinguishing area of ​​the arc-extinguishing chamber 300. This reduces the erosion of the stationary contact 200 and the arc-extinguishing chamber 300 by the arc generated during the circuit breaker's breaking process, thereby improving the reliability of the arc-extinguishing system. The arc-extinguishing shielding assembly is designed as a combination of a stationary cover 500 and an arc-extinguishing cover 400. This design not only retains the original function of the arc-extinguishing shielding assembly but also allows for selection based on the circuit breaker's breaking requirements: the stationary cover 500 can be used alone, or the stationary cover 500 and the arc-extinguishing cover 400 can be used simultaneously. This modular design allows for adjustment of the protection level according to actual operating conditions, optimizing the cost structure while ensuring breaking performance.

[0053] Figure 6 This is an assembly diagram of the arc-extinguishing shield and the stationary shield provided in an embodiment of this application. Furthermore, to improve the reliability of the arc-extinguishing shield assembly, such as... Figures 1 to 6As shown, the arc-extinguishing shield 400 has an extension section 410 on the side near the stationary shield 500. The side of the stationary shield 500 facing the first end 210 abuts against the extension section 410 to limit the arc-extinguishing shield 400, preventing the arc-extinguishing shield 400 from moving away from the arc-extinguishing chamber 300.

[0054] The extension section 410 refers to an extension structure provided on the side of the arc-extinguishing shield 400 near the stationary shield 500. Specifically, it can be implemented as a plate-like or protruding structure integrally formed with the arc-extinguishing shield 400. It increases the contact area between the arc-extinguishing shield 400 and the stationary shield 500, forming a limiting support surface. This feature, through the extension length and shape design of the extension section 410, ensures that the stationary shield 500 can effectively block the displacement path of the arc-extinguishing shield 400.

[0055] The contact between the side of the stationary cover 500 facing the first end 210 and the extension section 410 means that the area of ​​the stationary cover 500 away from the base plate 110 forms a surface contact with the surface of the extension section 410. Specifically, this can be achieved by adjusting the installation position of the stationary cover 500 so that after assembly, the stationary cover 500 naturally presses against the extension section 410 in the direction facing the first end 210. This feature utilizes the stationary cover 500 as a fixed component, and the reaction force of the contact between the stationary cover 500 and the extension section 410 constrains the degree of freedom of movement of the arc-extinguishing cover 400.

[0056] Specifically, the arc-extinguishing cover 400 is limited by the contact relationship between the extension section 410 and the stationary cover 500. When the arc-extinguishing cover 400 is subjected to external force, the rigid structure of the stationary cover 500 applies a reverse constraint force to the extension section 410, preventing the arc-extinguishing cover 400 from moving away from the arc-extinguishing chamber 300.

[0057] In summary, the side of the stationary cover 500 facing the first end 210 abuts against the extension section 410. The positioning of the arc extinguishing cover 400 can be achieved solely through the structural cooperation between the stationary cover 500 and the arc extinguishing cover 400. This effectively prevents the arc extinguishing cover 400 from shifting due to arc impact or mechanical vibration during the circuit breaker disconnection process, thereby maintaining the integrity of the arc extinguishing shielding assembly and improving the reliability of the arc extinguishing system.

[0058] Figure 7 This is a schematic diagram of the structure of the base provided in an embodiment of this application. Figure 8 for Figure 7 An enlarged view of section A. (See image.) Figure 1 , Figures 3 to 5 , Figure 7 as well as Figure 8As shown, the circuit breaker also includes a moving contact 600, which is rotatably mounted within the base 100, with its second end 220 located on the rotation trajectory of the moving contact 600. A first baffle 120 is provided on the base plate 110, located on the side of the second end 220 away from the first end 210. The first baffle 120 has a clearance groove 121 for the moving contact 600 to move. A first limiting block 122 is provided on the side of the first baffle 120 facing the second end 220, located at the edge of the clearance groove 121. An arc-extinguishing shield 400 has a first limiting groove 420 on the side facing the first baffle 120, with the first limiting block 122 located within it. A stop block 510 is provided on the side of the stationary shield 500 facing the first baffle 120, abutting against the side of the first limiting block 122 away from the clearance groove 121.

[0059] The moving contact 600 can be rotatably connected to the base 100 via a rotating shaft or pivot structure to ensure that the moving contact 600 can rotate along a set trajectory during the breaking or closing process of the circuit breaker.

[0060] The first baffle 120 refers to a plate-shaped structure that is perpendicular to the base plate 110. Specifically, it can be integrally formed with the base 100 by injection molding. The first baffle 120 is used to block the electric arc from spreading away from the arc-extinguishing chamber 300 and prevent the internal components of the circuit breaker from being burned by the electric arc.

[0061] The clearance groove 121 refers to the U-shaped or rectangular through groove formed on the first baffle 120. The clearance groove 121 can provide the moving contact 600 with movement space when the circuit breaker is opened or closed.

[0062] The first limiting block 122 refers to a block-shaped structure protruding from the surface of the first baffle 120. The first limiting block 122 can be set on the side of the first baffle 120 facing the second end 220.

[0063] There can be two first limiting blocks 122, which can be respectively disposed at two symmetrical edges of the clearance groove 121. There can also be two first limiting grooves 420, which can correspond to two first limiting blocks 122 respectively. Correspondingly, there can also be two stop blocks 510, which can correspond to two stop blocks 510 respectively.

[0064] Specifically, when the moving contact 600 separates from the second end 220 of the stationary contact 200 along its rotational trajectory during the circuit breaker's breaking process, the arc can enter the arc-extinguishing chamber 300. The first baffle 120, by providing a clearance groove 121, allows the moving contact 600 to move normally. Simultaneously, two first limiting blocks 122 are respectively embedded in the corresponding first limiting grooves 420 on the arc-extinguishing cover 400. This restricts the displacement of the arc-extinguishing cover 400, reducing the possibility of the arc-extinguishing cover 400 obstructing the clearance groove 121. The two stops 510 provided on the stationary cover 500 can respectively abut against the side of the corresponding first limiting block 122 away from the clearance groove 121. This restricts the displacement of the stationary cover 500, reducing the possibility of the stationary cover 500 obstructing the clearance groove 121.

[0065] Through the above technical solution, this application reduces the swaying problem caused by the lack of limiting positions for the arc-extinguishing shield 400 and the stationary shield 500. When the circuit breaker is subjected to vibration or impact, the displacement of the arc-extinguishing shield 400 and the stationary shield 500 is limited by the first limiting block 122, which can reduce the problem of the moving contact 600 being obstructed due to the displacement blocking groove 121 of the arc-extinguishing shield 400 and / or the stationary shield 500. When the rotation of the moving contact 600 within the groove 121 is undisturbed, the reliability of the circuit breaker's breaking and closing processes can be improved, thereby improving the reliability of the circuit breaker in use.

[0066] Figure 9 This is a schematic diagram of the arc-extinguishing chamber provided in an embodiment of this application. Figures 7 to 9 As shown, the arc-extinguishing chamber 300 includes two side plates 310 and multiple arc-extinguishing grid plates 320. The two side plates 310 are symmetrically arranged with a gap between them, and the multiple arc-extinguishing grid plates 320 are spaced apart within the gap. Each of the two side plates 310 has a slot 311 at one end near the base plate 110, and a locking block 130 is provided on the base plate 110, located within the slot 311.

[0067] The symmetrical arrangement of the two side plates 310 means that the two side plates 310 are mirror-distributed with the gap as the center. The symmetrical layout can form a stable support structure, which can improve the stability of the arc extinguishing chamber 300.

[0068] The slot 311 refers to the groove-shaped structure formed at the contact point between the side plate 310 and the base plate 110. It can be made by stamping or milling. The slot 311 and the locking block 130 on the base plate 110 can form a mechanical interlock, thereby limiting the arc extinguishing chamber 300.

[0069] The arc-extinguishing grid plates 320 are spaced apart, meaning that multiple arc-extinguishing grid plates 320 can be arranged at equal intervals within the gap, or multiple arc-extinguishing grid plates 320 can be arranged at unequal intervals within the gap. When all multiple arc-extinguishing grid plates 320 are arranged within the gap, one side of each arc-extinguishing grid plate 320 can be riveted to one of the side plates 310, and the other side of each arc-extinguishing grid plate 320 can be riveted to another side plate 310.

[0070] Specifically, the two side plates 310 are symmetrically installed to form a fixed gap, and the arc-extinguishing grid plates 320 are arranged at intervals within the gap, so that the arc is evenly divided and cooled after entering the gap. The slot 311 provided at the end of the side plate 310 near the bottom plate 110 engages with the locking block 130 provided on the bottom plate 110. After the locking block 130 is inserted into the slot 311, it forms a limit to prevent the arc-extinguishing chamber 300 from being displaced due to impact force when the circuit breaker is disconnected.

[0071] Through the above technical solutions, this application can effectively limit the displacement of the arc-extinguishing chamber 300. The symmetrically arranged two side plates 310 can reduce the displacement problem of the arc-extinguishing grid plate 320 due to structural instability, ensuring that the arc can be uniformly divided and cooled. The mechanical interlock between the slot 311 and the block 130 further enhances the connection stability between the arc-extinguishing chamber 300 and the base plate 110, reducing the probability of displacement of the arc-extinguishing chamber 300 caused by arc impact when the circuit breaker is disconnected, thereby improving the reliability of the arc-extinguishing system.

[0072] To improve the stability of the installation of the arc-extinguishing shield 400 and the static shield 500, the following improvements have been made in this application.

[0073] Figure 10 This is an assembly diagram of the stationary cover and stationary contact provided in an embodiment of this application. Figures 1 to 5 as well as Figures 9 to 10 As shown, the side plate 310 is provided with a second limiting groove 330 on the side away from the bottom plate 110, and the arc extinguishing cover 400 is provided with a second limiting block 430 on the side away from the static cover 500. The second limiting block 430 is located in the second limiting groove 330.

[0074] The second limiting groove 330 refers to a groove-shaped structure provided at the end of the side plate 310 away from the bottom plate 110. Because the arc extinguishing cover 400 is located in the area of ​​the arc extinguishing chamber 300 away from the stationary contact 200, and the stationary contact 200 is located on the bottom plate 110, when the second limiting groove 330 is provided at the end of the side plate 310 away from the bottom plate 110, the second limiting groove 330 can be used to accommodate the second limiting block 430 of the arc extinguishing cover 400, and the displacement of the arc extinguishing cover 400 is restricted by the contact between the groove wall of the second limiting groove 330 and the second limiting block 430.

[0075] The second limiting block 430 refers to the outward protrusion structure on the side wall of the arc extinguishing cover 400 away from the static cover 500. Specifically, it can be formed by injection molding or welding. The shape of the second limiting block 430 can match the second limiting groove 330. When the second limiting block 430 is located in the second limiting groove 330, it can form a mechanical limit.

[0076] In some possible embodiments, the size of the second limiting groove 330 may be larger than the size of the second limiting block 430. When the second limiting block 430 is located within the second limiting groove 330, the empty portion of the second limiting groove 330 may be used to install other components.

[0077] Please continue to refer to Figures 1 to 5 as well as Figures 9 to 10 As shown, the stationary cover 500 has a hook 520 on the side facing the stationary contact 200, and the hook 520 is hooked to the stationary contact 200.

[0078] The hook 520 refers to the bent hook-shaped structure provided on the side of the stationary cover 500 facing the stationary contact 200. The hook of the hook 520 can engage with the edge of the stationary contact 200 to prevent the stationary cover 500 from separating from the stationary contact 200. As described above, the stationary contact 200 is fixed to the base 100, and the stationary cover 500 limits the arc-extinguishing cover 400. When the positions of the stationary cover 500 and the stationary contact 200 are fixed, the installation stability of the arc-extinguishing cover 400 can be further improved.

[0079] In summary, the engagement of the second limiting groove 330 and the second limiting block 430 ensures that the arc-extinguishing cover 400 is limited by the side plate 310 after installation. This reduces the probability of the arc-extinguishing cover 400 detaching from the arc-extinguishing chamber 300 due to arc impact or mechanical vibration. The hook 520 engages with the stationary contact 200, rigidly fixing the stationary cover 500 to the stationary contact 200 and preventing the stationary cover 500 from shifting due to high arc temperature or airflow during the breaking process. The two sets of structures utilize the top of the arc-extinguishing chamber 300 and the stationary contact 200 respectively to constrain the arc-extinguishing shielding assembly, forming a dual limiting mechanism to ensure the relative position of the arc-extinguishing shielding assembly with the arc-extinguishing chamber 300 and the stationary contact 200 remains stable. This improves the reliability of the arc-extinguishing system.

[0080] Since the stationary contact 200 provides constraint for the stationary cover 500, the following improvements have been made in this application to further improve the installation stability of the stationary cover 500. For example... Figure 2 , Figure 3 as well as Figures 7 to 10As shown, the base plate 110 is provided with a spacer block 140, and the second end 220 is located on the spacer block 140. The second end 220 is provided with a flow guide groove 221, and a side of the spacer block 140 facing the second end 220 is provided with an insertion block 141. The insertion block 141 is located in the flow guide groove 221, and the insertion block 141 is in contact with the groove wall of the flow guide groove 221.

[0081] The spacer block 140 refers to a support structure fixed on the base plate 110 for carrying the second end 220 of the stationary contact 200, which can be specifically implemented by injection molding of an insulating material.

[0082] The flow guide groove 221 refers to a groove-shaped structure provided on the second end 220 of the stationary contact 200. The flow guide groove 221 may be an I-shape or a U-shape, and the flow guide groove 221 may penetrate the stationary contact 200 along the thickness direction of the stationary contact 200.

[0083] The insertion block 141 may be a protruding structure extending perpendicularly from the surface of the spacer block 140 in a direction away from the base plate 110, which may specifically be formed integrally with the spacer block 140. The width of the insertion block 141 may be less than or equal to the width of the flow guide groove 221, so that the insertion block 141 can be inserted into the flow guide groove 221.

[0084] In summary, the spacer block 140 is fixedly connected to the base plate 110 to form a basic support platform, and the entire second end 220 of the stationary contact 200 is supported on the surface of the spacer block 140. When the circuit breaker is disconnected, the mechanical impact force borne by the stationary contact 200 can be dispersed and transmitted to the base plate 110 through the spacer block 140, which can improve the impact resistance of the stationary contact 200. The groove wall of the flow guide groove 221 and the insertion block 141 form a surface contact constraint, so that the base plate 110 can limit the position of the stationary contact 200 through the spacer block 140, which can improve the installation stability of the stationary contact 200. When the installation stability of the stationary contact 200 is improved, the installation stability of the stationary housing 500 will also be improved, which in turn can improve the installation stability of the arc extinguishing housing 400. Thus, when the installation stability of the arc extinguishing shield assembly is improved, the service reliability of the arc extinguishing system can be improved.

[0085] Figure 11 is a schematic structural view of a middle cover provided by an embodiment of the present application. As Figure 1 , Figure 2 and Figure 11 shown, the circuit breaker of the present application further comprises a middle cover 700, and the middle cover 700 is covered on the base 100. A side of the middle cover 700 facing the base 100 is provided with a first abutment block 710, and the first abutment block 710 abuts against an end of the side plate 310 away from the base plate 110.

[0086] The middle cover 700 refers to the shell structure that covers the base 100. The middle cover 700 can form a closed space by cooperating with the base 100, which restricts the range of movement of the internal components of the circuit breaker and protects the internal components of the circuit breaker.

[0087] The first abutment block 710 can be a protruding structure provided on the side of the middle cover 700 facing the bottom cover. The first abutment block 710 can be made by injection molding process that is integrally formed with the middle cover 700. The function of the first abutment block 710 is to physically limit the arc extinguishing chamber 300 by abutting against the side plate 310.

[0088] Specifically, when the middle cover 700 is assembled onto the base 100, the first abutment block 710 can form surface contact with the edge of the side plate 310 of the arc-extinguishing chamber 300 away from the base plate 110. During the circuit breaker disconnection process, the vibration generated by the arc impact can be transmitted through the side plate 310 to the first abutment block 710, and then the middle cover 700 can absorb part of the energy generated by this vibration.

[0089] Through the above technical solution, the end of the side plate 310 away from the base plate 110 is blocked by the first abutment block 710 and cannot move along the arrangement direction of the middle cover 700 and the base 100. In this way, the arc-extinguishing grid plates 320 can maintain a parallel arrangement under the limitation of the side plate 310. As a result, the overall structural stability of the arc-extinguishing chamber 300 can be enhanced, the problem of reduced arc-extinguishing efficiency caused by misalignment of the arc-extinguishing grid plates 320 can be reduced, and the reliability of the arc-extinguishing system can be improved.

[0090] Further, please continue to refer to Figure 1 , Figure 2 as well as Figure 11 As shown, a second abutment block 720 is also provided on the side of the middle cover 700 facing the base 100, and the second abutment block 720 is disposed on one side of the first abutment block 710. The second abutment block 720 abuts against the side of the arc extinguishing cover 400 facing the middle cover 700.

[0091] The second abutment block 720 can be a protruding structure provided on the side of the middle cover 700 facing the bottom cover. The second abutment block 720 can be made by injection molding process that is integrally formed with the middle cover 700. The second abutment block 720 can apply a restraining force to the arc extinguishing cover 400 in the arrangement direction of the middle cover 700 and the base 100.

[0092] Specifically, when the arc-extinguishing shield 400 is subjected to mechanical impact during the breaking process, the second abutment block 720 can directly contact the side of the arc-extinguishing shield 400 facing the middle cover 700 to limit the arc-extinguishing shield 400 in a direction perpendicular to the base 100. This abutment relationship restricts the displacement of the arc-extinguishing shield 400 in the alignment direction of the middle cover 700 and the base 100. During the circuit breaker breaking operation, when the thermal expansion force generated by the arc acts on the arc-extinguishing shield 400, the rigid contact of the second abutment block 720 can effectively counteract the force on the arc-extinguishing shield 400.

[0093] The above technical solution can reduce the displacement of the arc-extinguishing cover 400 in the alignment direction of the middle cover 700 and the base 100. Since the arc-extinguishing cover 400 is installed on the arc-extinguishing chamber 300, when the arc-extinguishing cover 400 is limited, the arc-extinguishing chamber 300 can also be limited, thus improving the installation stability of the arc-extinguishing chamber 300. This, in turn, improves the reliability of the arc-extinguishing system.

[0094] In some possible embodiments, such as Figure 1 , Figure 2 , Figure 4 as well as Figure 9 As shown, a groove 340 can be provided on the side plate 310 of the arc-extinguishing chamber 300 facing the first baffle 120. A protrusion 440 can be provided on the arc-extinguishing cover 400 at a position corresponding to the groove 340. The protrusion 440 can be located in the groove 340. In this way, not only can the arc-extinguishing chamber 300 limit the movement of the arc-extinguishing cover 400 towards the second end 220, but the arc-extinguishing cover 400 can also be further limited in the arrangement direction of the middle cover 700 and the base 100.

[0095] like Figure 1 , Figures 7 to 9 as well as Figure 11 As shown, a second baffle 730 is also provided on the side of the middle cover 700 facing the base 100, and the second baffle 730 is positioned opposite to the first baffle 120. The end of the second baffle 730 facing the first baffle 120 abuts against the end of the first baffle 120 facing the second baffle 730.

[0096] The second baffle 730 refers to a plate-like structure installed inside the middle cover 700. The second baffle 730 is used to form symmetrical support with the first baffle 120 on the base 100. The contact between the second baffle 730 and the first baffle 120 means that the end of the second baffle 730 facing the first baffle 120 and the end of the first baffle 120 facing the second baffle 730 achieve force transmission through planar contact. That is, the pressure of the second baffle 730 on the first baffle 120 can be transmitted to the first baffle 120 through the contact surface, and the reaction force generated by the first baffle 120 can be transmitted to the second baffle 730 through the contact surface.

[0097] In some specific embodiments, the end of the second baffle 730 may be configured as a ramp or boss structure, for example, by using a ramp to guide assembly positioning.

[0098] With the above arrangement, the end of the second baffle 730 facing the first baffle 120 abuts against the end of the first baffle 120 facing the second baffle 730, which can form a continuous barrier between the second baffle 730 and the first baffle 120. This not only blocks the path of the arc spreading away from the arc-extinguishing chamber 300, forcing the arc to be confined within the space where the arc-extinguishing chamber 300 is located, but also increases the air pressure inside the cavity where the arc-extinguishing chamber 300 is located. This can improve the breaking capacity of the circuit breaker and thus improve the reliability of the arc-extinguishing system.

[0099] like Figure 9 as well as Figure 11 As shown, this application also provides a reinforcing rib 731 on the second baffle 730.

[0100] The reinforcing rib 731 can be a protruding structure extending from the surface of the second baffle 730. Specifically, it can be implemented by longitudinally parallel strip protrusions or grid-like intersecting protrusions to improve the bending resistance of the second baffle 730.

[0101] In summary, when the second baffle 730 is subjected to arc impact during the circuit breaker's breaking process, the reinforcing rib 731 increases the moment of inertia of the baffle section, disperses local stress concentration, and thus suppresses the bending deformation of the second baffle 730 caused by heat or mechanical impact. This ensures the integrity of the cavity containing the arc-extinguishing chamber 300, reduces gas leakage during circuit breaker breaking, improves the circuit breaker's breaking capacity, and ultimately enhances the reliability of the arc-extinguishing system.

Claims

1. A circuit breaker, characterized in that, include: Base, including the base plate; A stationary contact is located on the base plate. The stationary contact includes a first end and a second end that are positioned opposite each other. The first end is fixedly connected to the base plate. An arc-extinguishing chamber is disposed on the base plate, with a portion of the arc-extinguishing chamber located on the side of the stationary contact away from the base plate, and the second end located within the arc-extinguishing chamber; An arc-extinguishing shielding assembly includes an arc-extinguishing cover and a stationary cover, wherein one end of the arc-extinguishing cover facing the stationary cover is in contact with one end of the stationary cover facing the arc-extinguishing cover; The static cover is disposed on the second end, and at the same time, the static cover shields the area of ​​the arc-extinguishing chamber near the static contact, while the arc-extinguishing cover is disposed on the area of ​​the arc-extinguishing chamber away from the static contact.

2. The circuit breaker according to claim 1, characterized in that, The arc-extinguishing shroud has an extension section on the side near the static shroud; The side of the static shield facing the first end abuts against the extension section to limit the arc-extinguishing shield, preventing it from moving away from the arc-extinguishing chamber.

3. The circuit breaker according to any one of claims 1-2, characterized in that, The circuit breaker also includes a moving contact, which is rotatably disposed within the base, with the second end located on the rotation trajectory of the moving contact; The base plate is provided with a first baffle, which is located on the side of the second end away from the first end, and the first baffle is provided with a clearance groove for the moving contact to move. The first baffle is provided with a first limiting block on the side facing the second end, and the first limiting block is disposed at the edge of the relief groove; The arc-extinguishing cover is provided with a first limiting groove on the side facing the first baffle, and the first limiting block is located in the first limiting groove; The static cover has a stop block on the side facing the first baffle, and the stop block abuts against the side of the first limiting block away from the relief groove.

4. The circuit breaker according to claim 3, characterized in that, The arc-extinguishing chamber includes two side plates and multiple arc-extinguishing grid plates. The two side plates are symmetrically arranged and there is a gap between the two side plates. The multiple arc-extinguishing grid plates are spaced apart in the gap. Each of the two side plates has a slot at one end near the bottom plate, and a block is provided on the bottom plate, with the block located in the slot.

5. The circuit breaker according to claim 4, characterized in that, The side plate is provided with a second limiting groove on the side away from the bottom plate, and the arc extinguishing cover is provided with a second limiting block on the side away from the static cover. The second limiting block is located in the second limiting groove. The stationary cover is provided with a hook on the side facing the stationary contact, and the hook is hooked to the stationary contact.

6. The circuit breaker according to claim 1, characterized in that, The base plate is provided with a pad, and the second end is located on the pad; The second end is provided with a flow guide groove, and the pad is provided with an insertion block on the side facing the second end. The insertion block is located in the flow guide groove and is in contact with the groove wall of the flow guide groove.

7. The circuit breaker according to claim 4, characterized in that, It also includes a middle cover, which is disposed on the base; The middle cover has a first abutting block on the side facing the base, and the first abutting block abuts against the end of the side plate away from the bottom plate.

8. The circuit breaker according to claim 7, characterized in that, The middle cover has a second abutting block on the side facing the base, and the second abutting block is disposed on one side of the first abutting block; The second abutting block abuts against the side of the arc-extinguishing cover facing the middle cover.

9. The circuit breaker according to claim 7, characterized in that, The middle cover is provided with a second baffle on the side facing the base, and the second baffle is opposite to the first baffle. The end of the second baffle facing the first baffle abuts against the end of the first baffle facing the second baffle.

10. The circuit breaker according to claim 9, characterized in that, The second baffle is provided with reinforcing ribs.

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