A circuit breaker

Abstract

The application provides a circuit breaker, belonging to the technical field of electrical equipment. The circuit breaker comprises a shell, a partition plate and an arc extinguishing chamber. The shell comprises a side plate and two bottom plates, the side plate has a closed surrounding contour, the two bottom plates are respectively arranged at two open sides of the side plate, and the two bottom plates are fixedly connected with the side plate. The partition plate is in multiple pieces, and the multiple partition plates are arranged in the shell in a spaced manner, so that multiple independent chambers are formed in the shell, and a limiting plate is arranged in each independent chamber. The arc extinguishing chamber is in multiple pieces, and one arc extinguishing chamber is arranged in each independent chamber. The side plate, the bottom plate, the partition plate and the limiting plate cooperate to limit the arc extinguishing chamber, so that the arc extinguishing chamber is fixed in the shell. The scheme directly divides the installation area by using the internal space of the shell, eliminates the machining requirement of a special positioning groove, the arc extinguishing chamber can be directly placed in the space surrounded by the side plate, the partition plate and the limiting plate, bolt fastening operation is not required, the assembly process is simplified, and the installation cost of the arc extinguishing chamber is reduced.

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 contact assemblies and an arc-extinguishing chamber.

[0003] During the circuit breaker's disconnection process, an electric arc is generated in the contact assembly. This arc can enter the arc-extinguishing chamber for extinguishing. As the arc enters the chamber, it is subjected to the impact of the arc and high-temperature gases, necessitating a relatively stable installation. However, current technology suffers from high installation costs for arc-extinguishing chambers. Utility Model Content

[0004] This application provides a circuit breaker to reduce the installation cost of the arc-extinguishing chamber.

[0005] In a first aspect, this application provides a circuit breaker. The circuit breaker includes a housing, partitions, and arc-extinguishing chambers. The housing includes side plates and two base plates. The side plates have a closed, circumferential profile, forming a hollow region inside. The two base plates are respectively disposed on two open sides of the side plates, and both base plates are fixedly connected to the side plates. Multiple partitions are spaced apart within the housing to form multi-phase independent chambers. Each phase independent chamber is provided with a limiting plate. Multiple arc-extinguishing chambers are provided, with one arc-extinguishing chamber in each phase independent chamber. The side plates, base plates, partitions, and limiting plates cooperate to limit the arc-extinguishing chambers, thereby fixing them within the housing.

[0006] Through the above scheme, the side plates and bottom plate combine to form a rigid frame with a hollow area, providing a foundation installation space for the arc-extinguishing chamber. The partitions are arranged parallel to each other along the length of the shell, dividing the hollow area into multiple independent chambers, achieving physical isolation between the arc-extinguishing chambers of each phase. When the arc-extinguishing chamber is installed inside the circuit breaker shell, its outer surface is in contact with the inner walls of the side plates and / or partitions, its ends are in contact with the bottom plate, and its sides are supported by limiting plates. The spatial coordination of the components forms a three-dimensional limiting network, replacing traditional bolt fixing with structural interference, enabling the arc-extinguishing chamber to remain stable without additional connecting parts.

[0007] Compared to existing technologies, traditional solutions rely on positioning slots to guide the arc-extinguishing chamber's positioning, requiring specific slot structures to be reserved during the shell machining stage, which increases mold complexity and material consumption. This solution, however, utilizes a combination of shell, partitions, and limiting plates to directly divide the installation area within the shell's internal space, eliminating the need for dedicated positioning slots. During assembly, the arc-extinguishing chamber can be directly placed into the space enclosed by the side plates, partitions, and limiting plates without the need for bolt tightening, simplifying the assembly process. Furthermore, the integrated limiting structure avoids the risk of arc-extinguishing chamber displacement due to loose fasteners, thus improving the circuit breaker's reliability.

[0008] In one possible design, the circuit breaker also includes multiple sets of contact assemblies, with one set of contact assemblies located in each phase's independent chamber. The arc-extinguishing chamber includes an arc-entry side and an arc-exit side, with the contact assemblies located near the arc-entry side and near the side plate on the arc-exit side. Multiple vent holes are provided on the side plate near the arc-exit side.

[0009] With the above design, the contact assembly is positioned on the arc-entry side, allowing the arc generated during circuit breaker segmentation to directly enter the arc-extinguishing chamber for segmentation and cooling. The arc-exit side is close to the side plate, enabling gas to accumulate within the arc-extinguishing chamber and then be discharged through vents on the side plate. This avoids the impact of gas retention on arc-extinguishing performance.

[0010] In one possible design, a metal plate is provided between the arc-exit side and the side plate, and the metal plate has multiple filter holes. The diameter of the filter holes is smaller than the diameter of the exhaust holes, and the spacing between the multiple filter holes is smaller than the spacing between the multiple exhaust holes.

[0011] With the above scheme, when the gas generated by the electric arc carries metal particles outward, the small-diameter filter holes on the metal plate first block larger particles, while the remaining smaller particles are discharged through the large-diameter exhaust holes on the side plate. Thus, when the metal plate is arranged between the arc-extinguishing chamber's arc-exit side and the side plate, a double-layer filtration structure is formed, creating a multi-stage barrier effect during filtration, thereby enhancing the arc-extinguishing chamber's deionization effect on charged particles. Furthermore, the metal plate also increases the strength of the side plate, improving the reliability of the circuit breaker.

[0012] In one possible design, the housing has a mounting groove into which a metal plate is inserted.

[0013] The above design allows the sidewalls of the mounting groove to provide circumferential constraint on the metal plate, limiting its lateral displacement, while the bottom of the groove provides longitudinal support. The metal plate is inserted into the housing, eliminating the need for welding or bolting when the plate is confined within the housing. This avoids machining threaded holes or welding points on the housing and reduces the number of fasteners required. This not only lowers manufacturing costs but also prevents the risk of the metal plate detaching due to loose welding or bolts.

[0014] In one possible design, the limiting plate has a through slot that connects to the arc inlet side. The arc generated by the breakage of the contact assembly passes sequentially through the through slot and the arc inlet side before entering the arc extinguishing chamber for extinguishing.

[0015] Through the above scheme, the opening of the through slot can form a spatial matching relationship with the arc-entry side of the arc-extinguishing chamber, allowing the arc to be guided directly to the arc-extinguishing area along a preset path without needing to detour or disperse. While maintaining the chamber separation function, the limiting plate integrates the arc channel through the through slot, avoiding the need for additional arc-guiding components. This design not only achieves efficient directional guidance of the arc during circuit breaker interruption, ensuring the arc quickly enters the arc-extinguishing chamber for extinguishing, but also simplifies the internal structure of the chamber, reduces component processing and assembly costs, thereby improving the production efficiency and operational reliability of the circuit breaker.

[0016] In one possible design, the through channel is a U-shaped channel, and the limiting plate has an air-blocking rib on the side facing the inlet arc. There are two air-blocking ribs, each located on one of the two vertical edges of the U-shaped channel. The distance between the sides of the two air-blocking ribs away from the limiting plate is less than the distance between the sides of the two air-blocking ribs connected to the limiting plate.

[0017] With the above scheme, when the circuit breaker breaks and generates an arc, the arc enters the arc-extinguishing chamber through the open end of the U-shaped groove. The gradually decreasing spacing of the baffle ribs creates an accelerating airflow zone along the arc's movement path, using the airflow to rapidly propel the arc into the arc-extinguishing chamber. As the high-temperature gas generated during arc extinguishing diffuses outward, the decreasing spacing of the baffle ribs forms a physical barrier, forcing the gas to flow in a specific direction and preventing disordered diffusion from impacting the shell side plates. In this way, bidirectional control of gas flow is achieved while maintaining a stable arc path, optimizing arc extinguishing efficiency and avoiding the need for additional complex gas guiding devices.

[0018] In one possible design, the housing includes a base and a substructure, with the base covering the substructure. A side panel portion is located on the base, and another portion of the side panel is located on the substructure. A partition portion is located on the base, and another portion of the partition is located on the substructure. One bottom plate is located on the base, and the other bottom plate is located on the substructure.

[0019] Through the above-described solution, this application achieves automatic positioning and fixation of the arc-extinguishing chamber during the shell assembly process, eliminating the traditional positioning process, reducing the number of fasteners used, and lowering manufacturing costs. The split side plate and partition design simplifies the assembly steps, avoids the alignment difficulties encountered during the installation of traditional integral components, and improves assembly efficiency. The clamping structure formed by the split base plate replaces the traditional bolt fixing method, ensuring the reliability of the arc-extinguishing chamber fixation while reducing the number of parts used.

[0020] In one possible design, the arc-extinguishing chamber includes two support plates and multiple arc-extinguishing grid plates. The two support plates are symmetrically arranged with a gap between them, and the multiple arc-extinguishing grid plates are spaced apart within the gap. Limiting ribs are provided at positions corresponding to the base plate and the two support plates. When the base and the subbase are closed, the limiting ribs on the base abut against the side of the support plate closest to the base, and the limiting ribs on the subbase abut against the side of the support plate closest to the subbase.

[0021] Through the above scheme, the arc-extinguishing chamber forms a stable frame structure with symmetrically arranged support plates, and the arc-extinguishing grid plates are evenly distributed within the gaps to achieve arc segmentation. When the base and the bottom plate are closed, the limiting ribs on the bottom plate of the base abut downwards against the upper end of the support plate of the arc-extinguishing chamber, and the limiting ribs on the bottom plate of the bottom plate abut upwards against the lower end of the support plate of the arc-extinguishing chamber. This creates a two-way mechanical constraint on the arc-extinguishing chamber. This constraint is automatically completed through the shell closing action, which not only reduces the number of fasteners used but also further improves the fixing effect of the arc-extinguishing chamber.

[0022] In one possible design, the circuit breaker also includes an arc-starting plate disposed between two support plates.

[0023] By implementing the above-mentioned scheme, this application can optimize the arc movement path by setting an arc-initiating plate, thereby shortening the time for the arc to enter the arc-extinguishing grid and effectively improving the energy dissipation efficiency during the circuit breaker's breaking process.

[0024] In one possible design, the partition on the base has a protrusion on the side facing the base, and the partition on the base has a groove on the side facing the base. Alternatively, the partition on the base has a groove on the side facing the base, and the partition on the base has a protrusion on the side facing the base. When the base and the base are closed, the protrusion is located within the groove.

[0025] Through the above-described design, the combination of protrusions and grooves on the partition plate not only achieves positioning but also enhances the connection stability between the base and the subbase, avoiding the risk of displacement due to vibration. Furthermore, the combination of protrusions and grooves on the partition plate increases the electrical clearance and creepage distance between adjacent phases, thus reducing the probability of short circuits during circuit breaker disconnection and improving the reliability of the circuit breaker. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the circuit breaker provided in the embodiments of this application.

[0027] Figure 2 This is a schematic diagram of the base provided in an embodiment of this application from one perspective.

[0028] Figure 3This is a schematic diagram of the arc-extinguishing chamber disposed within the base, as provided in an embodiment of this application.

[0029] Figure 4 This is a partial structural schematic diagram of the circuit breaker provided in an embodiment of this application.

[0030] Figure 5 This is a schematic diagram of the arc-extinguishing chamber provided in an embodiment of this application.

[0031] Figure 6 This is a schematic diagram of the structure of the metal plate provided in an embodiment of this application.

[0032] Figure 7 This is a schematic diagram of the base provided in an embodiment of this application from another perspective.

[0033] Figure 8 for Figure 7 An enlarged view of section A.

[0034] Figure 9 This is a schematic diagram of the structure of the base provided in an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures: 100. Shell; 110. Side plate; 111. Vent hole; 120. Base plate; 121. Limiting rib; 130. Mounting groove; 200. Partition; 210. Limiting plate; 220. Protrusion; 230. Groove; 300, Arc-extinguishing chamber; 310, Arc-entry side; 320, Arc-exit side; 330, Support plate; 340, Arc-extinguishing grid plate; 400. Contact assembly; 500, metal plate; 510, filter holes; 600. Air baffle; 700, Arc-starting plate. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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, terms such as "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 used 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.

[0042] 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.

[0043] 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.

[0044] In existing technologies, conventional circuit breaker arc-extinguishing chambers typically require a dedicated positioning groove to be cut along the casing during installation. The arc-extinguishing chamber is then inserted into the groove from above and fixed to the base and pedestal with fasteners. This installation method complicates the assembly process of the arc-extinguishing chamber and necessitates the additional machining of the positioning groove structure on the circuit breaker casing, increasing mold costs and machining time. Furthermore, the use of fasteners not only increases the number of parts but also makes it susceptible to installation errors that could affect the positioning accuracy of the arc-extinguishing chamber.

[0045] 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.

[0046] 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 a schematic diagram of the base provided in an embodiment of this application from one perspective. Figure 3 This is a schematic diagram of the arc-extinguishing chamber disposed within the base, as provided in an embodiment of this application. Figures 1 to 3 As shown, this application provides a circuit breaker. The circuit breaker includes a housing 100, partitions 200, and arc-extinguishing chambers 300. The housing 100 includes side plates 110 and two base plates 120. The side plates 110 have a closed circumferential profile, forming a hollow region inside the side plates 110. The two base plates 120 are respectively disposed on the two open sides of the side plates 110, and both base plates 120 are fixedly connected to the side plates 110. There are multiple partitions 200, which are spaced apart within the housing 100 to form multi-phase independent chambers within the housing 100. Each phase independent chamber is provided with a limiting plate 210. There are multiple arc-extinguishing chambers 300, with one arc-extinguishing chamber 300 in each phase independent chamber. The side plates 110, base plates 120, partitions 200, and limiting plates 210 cooperate to limit the arc-extinguishing chamber 300, thereby fixing the arc-extinguishing chamber 300 within the housing 100.

[0047] The closed, encircling side plate 110 refers to the side plate 110 forming a continuous, closed ring structure to create a stable three-dimensional frame structure, providing basic support for the arc-extinguishing chamber 300. The two base plates 120 refer to the plate-shaped components that cover the openings at both ends of the side plate 110. The two base plates 120 and the side plate 110 together can construct a sealed installation space.

[0048] The multiple partitions 200 are spaced apart, meaning that the internal space of the housing 100 can be divided into multiple independent areas, thus allowing for multi-phase operation within the circuit breaker. The partitions 200 can be integrally formed with the housing 100 as stiffening ribs. The multiple partitions 200 within the housing 100 ensure that the arc-extinguishing chambers 300 of each phase operate without interference. The limiting plate 210 refers to a positioning structure located within an independent chamber.

[0049] In summary, the side plate 110 and the base plate 120 combine to form a rigid frame with a hollow area, providing a basic installation space for the arc-extinguishing chamber 300. The partition plates 200 are arranged parallel to each other along the length of the housing 100, dividing the hollow area into multiple independent chambers and achieving physical isolation between the arc-extinguishing chambers 300 of each phase. When the arc-extinguishing chamber 300 is installed inside the circuit breaker housing 100, its outer surface is in contact with the inner wall of the side plate 110 and / or the partition plate 200, its ends are in contact with the base plate 120, and its sides are supported by the limiting plate 210. The spatial coordination of the components forms a three-dimensional limiting network, and by replacing traditional bolt fixing with structural interference, the arc-extinguishing chamber 300 can remain stable without additional connecting parts.

[0050] Compared to existing technologies, traditional solutions rely on positioning slots to guide the arc-extinguishing chamber 300 for positioning, requiring a specific slot structure to be reserved during the machining of the housing 100, which increases mold complexity and material consumption. This solution, however, utilizes the combined arrangement of the housing 100, partition 200, and limiting plate 210 to directly divide the installation area within the housing 100, eliminating the need for machining dedicated positioning slots. During assembly, the arc-extinguishing chamber 300 can be directly placed into the space enclosed by the side plate 110, partition 200, and limiting plate 210 without the need for bolt tightening, simplifying the assembly process. Furthermore, the integrated limiting structure avoids the risk of displacement of the arc-extinguishing chamber 300 due to loose fasteners, thus improving the reliability of the circuit breaker.

[0051] Figure 4 This is a partial structural schematic diagram of the circuit breaker provided in an embodiment of this application. Figure 5 This is a schematic diagram of the arc-extinguishing chamber provided in an embodiment of this application. Figure 4 as well as Figure 5As shown, the circuit breaker mentioned in this application also includes multiple sets of contact assemblies 400, with one set of contact assemblies 400 provided in each phase's independent chamber. The arc-extinguishing chamber 300 includes an arc-entry side 310 and an arc-exit side 320. The contact assembly 400 is located near the arc-entry side 310, and the arc-exit side 320 is located near the side plate 110. The side plate 110 near the arc-exit side 320 is provided with multiple vent holes 111.

[0052] The contact assembly 400 refers to a conductive component used to interrupt current and generate an electric arc. The contact assembly 400 may include a moving contact and a stationary contact. The contact assembly 400 may be located close to the arc-entry side 310, so that the electric arc generated by the circuit breaker during the interruption process can more easily enter the arc-extinguishing chamber 300 through the arc-entry side 310.

[0053] The arc-entry side 310 refers to the side of the arc-extinguishing chamber 300 closest to the contact assembly 400, which can be configured as an open structure to receive the electric arc generated when the circuit breaker breaks. The arc-exit side 320 refers to the side of the arc-extinguishing chamber 300 furthest from the contact assembly 400, which can be configured as a closed structure to extinguish the electric arc.

[0054] The vent 111 refers to the through hole structure opened on the side plate 110. The vent 111 can be a circular hole or a rectangular hole, etc. The diameter of the vent 111 can be 3-5 mm. The vent 111 can be used to discharge the gas generated during the arc extinguishing process outside the shell 100.

[0055] With the above technical solution, the contact assembly 400 is positioned on the arc-entry side 310, allowing the arc generated during circuit breaker segmentation to directly enter the arc-extinguishing chamber 300 for segmentation and cooling. The arc-exit side 320 is close to the side plate 110, enabling gas to accumulate within the arc-extinguishing chamber 300 and then be discharged through the exhaust port 111 on the side plate 110. This avoids the impact of gas retention on arc-extinguishing performance.

[0056] Figure 6 This is a schematic diagram of the structure of the metal plate provided in an embodiment of this application. Since the vent 111 of this application is directly disposed on the side plate 110, in order to improve the strength of the side plate 110, such as... Figure 3 , Figure 4 as well as Figure 6 As shown, this application further includes a metal plate 500 between the arc-exit side 320 and the side plate 110, and the metal plate 500 has a plurality of filter holes 510. The diameter of the filter holes 510 is smaller than the diameter of the exhaust holes 111, and the spacing between the plurality of filter holes 510 is smaller than the spacing between the plurality of exhaust holes 111.

[0057] The metal plate 500 can be an independent metal component located between the exhaust channel of the arc-extinguishing chamber 300 and the side plate 110 of the shell 100. Specifically, it can be formed by stamping a stainless steel plate with a thickness of 0.5-1.2 mm. A pre-filter layer is formed by machining densely distributed filter holes 510 on the metal plate 500. The pore size of the filter holes 510 can be 0.5-1.5 mm, and the filter holes 510 can be used to intercept metal debris and charged particles generated by the electric arc.

[0058] In summary, when the gas generated by the electric arc carries metal particles outward, the small-diameter filter holes 510 on the metal plate 500 first block large particles, while the remaining smaller particles are discharged through the large-diameter exhaust holes 111 on the side plate 110. Thus, when the metal plate 500 is arranged between the arc-extinguishing chamber 300's arc-exit side 320 and the side plate 110, a double-layer filtration structure is formed. This allows the metal plate 500 to create a multi-stage barrier effect during filtration, thereby enhancing the arc-extinguishing chamber 300's deionization effect on charged particles. Furthermore, the metal plate 500 also increases the strength of the side plate 110, improving the reliability of the circuit breaker.

[0059] Figure 7 A schematic diagram of the base provided in an embodiment of this application from another perspective. Further, as... Figure 3 , Figure 4 , Figure 6 as well as Figure 7 As shown, the housing 100 is also provided with a mounting groove 130, into which the metal plate 500 can be inserted.

[0060] Mounting groove 130 refers to a groove-shaped structure with a specific shape provided on the inner wall of housing 100. Specifically, there can be two mounting grooves 130, which can be respectively provided on side plate 110 and partition plate 200, and the two mounting grooves 130 can be positioned opposite each other. The mounting groove 130 can provide positioning and fixed support for metal plate 500.

[0061] Insertion refers to the direct embedding of the metal plate 500 into the mounting groove 130 through the matching relationship between its edge and the groove. Specifically, it can be achieved by interference fit or clearance fit. Through insertion, the metal plate 500 can remain stable without additional fasteners.

[0062] Specifically, the size and shape of the mounting groove 130 can match the edge of the metal plate 500, and the metal plate 500 can be inserted along the extension direction of the mounting groove 130 during assembly until it is fully embedded in the groove.

[0063] Through the above technical solution, the sidewalls of the mounting groove 130 can form a circumferential constraint on the metal plate 500, limiting its lateral displacement, while the bottom of the groove provides longitudinal support. The metal plate 500 is installed inside the housing 100 by insertion, so that the metal plate 500 is confined within the housing 100 without welding or bolting. This avoids machining threaded holes or welding positions on the housing 100 and reduces the number of fasteners used. This not only reduces manufacturing costs but also avoids the risk of the metal plate 500 falling off due to welding or bolt loosening.

[0064] like Figures 2 to 4 As shown, the limiting plate 210 may be provided with a through groove, which is connected to the arc inlet side 310. The electric arc generated by the contact assembly 400 can pass through the through groove and the arc inlet side 310 in sequence and then enter the arc extinguishing chamber 300 for extinguishing.

[0065] A through slot refers to a through-channel structure opened on the limiting plate 210. The through slot can be used to form a channel for the directional movement of the electric arc.

[0066] When the contact assembly 400 breaks, the electric arc first passes through a through slot on the limiting plate 210, which forms a continuous channel with the opening on the arc-entry side 310. Under the action of electromagnetic force, the electric arc moves along the extension direction of the through slot and enters the arc-extinguishing chamber 300 through the arc-entry side 310.

[0067] In summary, the through slot allows for spatial alignment with the arc-entry side 310 of the arc-extinguishing chamber 300, enabling the arc to be guided directly to the arc-extinguishing area along a preset path without needing to detour or disperse. The limiting plate 210, while maintaining the chamber separation function, integrates the arc channel through the through slot, avoiding the need for additional arc-guiding components. This design not only achieves efficient directional guidance of the arc during circuit breaker interruption, ensuring the arc quickly enters the arc-extinguishing chamber 300 for extinguishing, but also simplifies the internal structure of the chamber, reducing component processing and assembly costs, thereby improving the circuit breaker's production efficiency and operational reliability.

[0068] Figure 8 for Figure 7 An enlarged view of section A. (See image.) Figure 2 , Figure 3 , Figure 5 , Figure 7 as well as Figure 8 As shown, the through groove can be a U-shaped groove, and the limiting plate 210 has an air-blocking rib 600 on the side facing the arc-entry side 310. There are two air-blocking ribs 600, which are respectively set on the two vertical edges of the U-shaped groove. The distance between the two air-blocking ribs 600 on the side away from the limiting plate 210 is smaller than the distance between the two air-blocking ribs 600 on the side connected to the limiting plate 210.

[0069] A U-shaped channel refers to a channel with a U-shaped cross-sectional profile, which can be formed on the limiting plate 210 by stamping or machining. An air-blocking rib 600 is a plate-like structure extending along the vertical edge of the U-shaped channel towards the arc-advancing side 310, which can be a metal strip integrally formed with the limiting plate 210 or a welded additional component. A gradually narrowing airflow channel can be formed by varying the spacing between two air-blocking ribs 600. The spacing of the air-blocking ribs 600 decreases on the side away from the limiting plate 210, which can be achieved using a symmetrical tilt or arc-shaped transition geometry design, creating a gradually narrowing angle between the two air-blocking ribs 600.

[0070] In summary, when the circuit breaker trips and generates an arc, the arc enters the arc-extinguishing chamber 300 through the open end of the U-shaped groove. The gradually decreasing spacing of the air-blocking ribs 600 creates an accelerating airflow region along the arc's movement path, using the airflow to propel the arc rapidly into the arc-extinguishing chamber 300. As the high-temperature gas generated during arc extinguishing diffuses outward, the decreasing spacing of the air-blocking ribs 600 forms a physical barrier, forcing the gas to flow in a specific direction and preventing disordered diffusion from impacting the side plate 110 of the casing 100. In this way, bidirectional control of gas flow is achieved while maintaining a stable arc path, optimizing arc extinguishing efficiency and avoiding the need for complex gas guiding devices.

[0071] Figure 9 This is a schematic diagram of the structure of the base provided in an embodiment of this application. Figure 2 , Figure 7 as well as Figure 9 As shown, this application further proposes that the housing 100 includes a base and a base, with the base covering the base. A side plate 110 is partially located on the base, and another portion of the side plate 110 is located on the base. A partition 200 is partially located on the base, and another portion of the partition 200 is located on the base. One bottom plate 120 is located on the base, and the other bottom plate 120 is located on the base.

[0072] The base and the base are fitted together, which means that the two independent components form a closed shell 100 through a mating structure. Specifically, it can be achieved by using a snap-fit ​​or bolt connection, which is used to form the installation space of the arc-extinguishing chamber 300 during the assembly process.

[0073] The split layout of the side panel 110 means that the side panel 110 is divided into upper and lower parts, which are integrated on the base and the base respectively. This can be achieved through injection molding. After the base and the base are closed, a complete side panel 110 can be formed.

[0074] The partition 200 split layout means that the partition 200 is divided into upper and lower parts, which are fixed to the base and the base respectively. When the base and the base are closed, a continuous partition 200 can be formed.

[0075] The separate configuration of the base plate 120 refers to the two base plates 120 being fixed to the base and the base respectively. This can be achieved through an injection molding process, which forms a clamping and limiting effect on the arc-extinguishing chamber 300 when the shell 100 is closed.

[0076] Specifically, during assembly, the base and the base form a closed shell 100 through a closing action. The upper half of the side plate 110 integrated on the base and the lower half of the side plate 110 on the base automatically splice together to form a complete side plate 110. The upper half of the partition 200 is fixed inside the base, and the lower half of the partition 200 is fixed inside the base. When the base and the base are closed, the upper and lower partitions 200 form a continuous isolation structure to divide independent chambers. The bottom plate 120 on the base and the bottom plate 120 on the base form a clamping effect on the upper and lower ends of the arc-extinguishing chamber 300 after closing. The mechanical pressure generated by the closing of the shell 100 achieves the fixation of the arc-extinguishing chamber 300 without the need for additional positioning slots or fasteners.

[0077] Through the above technical solutions, this application achieves automatic positioning and fixing of the arc-extinguishing chamber 300 during the assembly process of the shell 100, eliminating the traditional positioning process, reducing the number of fasteners used, and lowering production costs. The split-type side plate 110 and partition plate 200 design simplifies the assembly steps, avoids the alignment difficulties encountered during the installation of traditional integral components, and improves assembly efficiency. The clamping structure formed by the split base plate 120 replaces the traditional bolt fixing method, ensuring the reliability of the arc-extinguishing chamber 300 while reducing the number of parts used.

[0078] Please continue to refer to Figure 2 , Figure 7 as well as Figure 9 As shown, the arc-extinguishing chamber 300 includes two support plates 330 and multiple arc-extinguishing grid plates 340. The two support plates 330 are symmetrically arranged with a gap between them, and the multiple arc-extinguishing grid plates 340 are spaced apart within the gap. A limiting rib 121 is provided at a position corresponding to the base plate 120 and the two support plates 330. When the base and the subbase are closed, the limiting rib 121 on the base abuts against the side of the support plate 330 near the base, and the limiting rib 121 on the subbase abuts against the side of the support plate 330 near the subbase.

[0079] The two support plates 330 of the arc-extinguishing chamber 300 refer to the symmetrical plates that constitute the main frame of the arc-extinguishing chamber 300. Specifically, they can be made of stamped steel plates. The two support plates 330 are symmetrically arranged and there is a gap between the two support plates 330, which can form a fixed space to accommodate the arc-extinguishing grid plate 340.

[0080] The limiting rib 121 refers to the protrusion structure provided on the base plate 120 of the base and the bottom plate 120 of the base. The limiting rib 121 can be integrally formed with the base plate 120. The limiting rib 121 is used to form a bidirectional clamping effect on the support plate 330 of the arc-extinguishing chamber 300 when the base and the bottom plate are closed. The arc-extinguishing grid plate 340 refers to a sheet-like component made of magnetically conductive material, specifically formed by stacking thin copper alloy sheets. The arc-extinguishing grid plate 340 is used to divide the electric arc and accelerate its cooling and extinguishing.

[0081] In summary, the arc-extinguishing chamber 300 forms a stable frame structure through symmetrically arranged support plates 330, and the arc-extinguishing grid plates 340 are evenly distributed within the gaps to achieve arc segmentation. When the base and the base plate are closed, the limiting ribs 121 on the base plate 120 abut downwards against the upper end of the support plate 330 of the arc-extinguishing chamber 300, and the limiting ribs 121 on the base plate 120 abut upwards against the lower end of the support plate 330 of the arc-extinguishing chamber 300, thus forming a two-way mechanical constraint on the arc-extinguishing chamber 300. This constraint is automatically completed by the closing action of the housing 100, which not only reduces the number of fasteners used but also further improves the fixing effect of the arc-extinguishing chamber 300.

[0082] like Figure 1 , Figure 4 , Figure 5 as well as Figure 9 As shown, based on the setting of the limiting rib 121, the circuit breaker mentioned in this application also includes an arc-starting plate 700, which can be set between two support plates 330.

[0083] The arc-starting plate 700 refers to a conductive or magnetic component installed between the two support plates 330 of the arc-extinguishing chamber 300, used to guide the arc path. It can be made of thin metal sheet or alloy material, and the arc-starting plate 700 can be fixed by welding or snap-fitting. As described above, the limiting rib 121 provides support for the support plates 330 of the arc-extinguishing chamber 300, thus raising the installation height of the arc-extinguishing chamber 300. When the installation height of the arc-extinguishing chamber 300 is raised, sufficient space can be left between the arc-extinguishing chamber 300 and the base plate 120 for installing the arc-starting plate 700.

[0084] The function of the arc-starting plate 700 is to provide directional guidance when an electric arc is generated, so as to prevent the electric arc from spreading disorderly within the casing 100.

[0085] Specifically, when the contacts break and generate an electric arc, the arc-initiating plate 700 directly captures the arc and guides it into the arc-extinguishing grid 340. The arc is constrained in the physical channel formed by the arc-initiating plate 700 and enters the arc-extinguishing grid 340 along a predetermined path for segmentation and cooling, thus avoiding arc retention within the housing 100.

[0086] In some specific embodiments, the arc-initiating plate 700 can be configured as a long strip structure parallel to the arc-extinguishing grid plate 340, and its length direction can be consistent with the extension direction of the support plate 330 of the arc-extinguishing chamber 300. The arc-initiating plate 700 can be installed in the vicinity of the arc-entry side 310 to ensure that the arc is effectively captured in the early stage of entering the arc-extinguishing chamber 300.

[0087] Through the above technical solution, this application can optimize the arc movement path by setting the arc-initiating plate 700, thereby shortening the time for the arc to enter the arc-extinguishing grid plate 340 and effectively improving the energy dissipation efficiency during the circuit breaker breaking process.

[0088] like Figure 2 , Figure 7 as well as Figure 9 As shown, the partition 200 on the base has a protrusion 220 on the side facing the base, and a groove 230 on the side facing the base. Alternatively, the partition 200 on the base has a groove 230 on the side facing the base, and a protrusion 220 on the side facing the base. When the base and the base are closed, the protrusion 220 is located within the groove 230.

[0089] The protrusion 220 refers to the protrusion structure extending outward from the surface of the partition 200. Specifically, it can be implemented using a cylindrical or rectangular boss, which is used to embed into the corresponding groove 230 to form a physical limit.

[0090] The groove 230 refers to the inward recessed receiving structure on the surface of the partition 200. Specifically, it can be implemented by using a groove that matches the shape of the protrusion 220, which is used to receive the protrusion 220 and limit its displacement.

[0091] When the base and the base are closed, the protrusion 220 and the groove 230 on the partition 200 engage with each other to form a mechanical fit. Through the complementary structure of the protrusion 220 and the groove 230, the partition 200 can be positioned without the need for external fasteners during assembly. When the base and the base are closed, the protrusion 220 is embedded in the groove 230, and the concave and convex structures on both sides of the partition 200 generate a restraining force, thereby fixing the partition 200 within the housing 100.

[0092] Through the above technical solution, the structure in which the protrusion 220 and groove 230 on the partition 200 cooperate to achieve limiting while enhancing the connection stability between the base and the seat, avoiding the risk of displacement due to vibration. Furthermore, the cooperation between the protrusion 220 and groove 230 on the partition 200 can also increase the electrical clearance and creepage distance between adjacent phases, thus reducing the probability of short circuits during circuit breaker disconnection and improving the reliability of the circuit breaker.

Claims

1. A circuit breaker, characterized in that, include: The housing includes a side plate and two bottom plates. The side plate has a closed circumferential profile to form a hollow region inside the side plate. The two bottom plates are respectively disposed on the two open sides of the side plate, and both bottom plates are fixedly connected to the side plate. The partition is provided in multiple partitions, which are spaced apart within the housing to form a multi-phase independent chamber within the housing. Each phase independent chamber is provided with a limiting plate. The arc-extinguishing chamber is provided in multiple ways, with each phase having an arc-extinguishing chamber in its independent chamber. The side plate, the bottom plate, the partition plate, and the limiting plate work together to limit the arc-extinguishing chamber so that the arc-extinguishing chamber is fixed inside the housing.

2. The circuit breaker according to claim 1, characterized in that, It also includes multiple sets of contact assemblies, with each independent chamber of each phase equipped with a set of contact assemblies; The arc-extinguishing chamber includes an arc-inlet side and an arc-outlet side, with the contact assembly located near the arc-inlet side and the arc-outlet side located near the side plate; Multiple vent holes are provided on the side plate near the arc-shaped side.

3. The circuit breaker according to claim 2, characterized in that, A metal plate is provided between the arc-exiting side and the side plate, and the metal plate is provided with multiple filter holes; The diameter of the filter holes is smaller than the diameter of the exhaust holes, and the spacing between the plurality of filter holes is smaller than the spacing between the plurality of exhaust holes.

4. The circuit breaker according to claim 3, characterized in that, The housing has a mounting groove, and the metal plate is inserted into the mounting groove.

5. The circuit breaker according to claim 2, characterized in that, The limiting plate is provided with a through groove, which is connected to the arc-entry side; The electric arc generated by the break of the contact assembly passes sequentially through the through slot and the arc inlet side before entering the arc extinguishing chamber for extinguishing.

6. The circuit breaker according to claim 5, characterized in that, The through groove is a U-shaped groove, and the limiting plate has an air-blocking rib on the side facing the arc-entry side; There are two air-blocking ribs, which are respectively disposed on the two vertical edges of the U-shaped groove; The distance between the two air-blocking ribs on the side away from the limiting plate is less than the distance between the two air-blocking ribs on the side connected to the limiting plate.

7. The circuit breaker according to any one of claims 1-6, characterized in that, The housing includes a base and a base, wherein the base covers the base; The side plate is located on the base, and the other part of the side plate is located on the base plate; The partition plate is located on the base, and the other part of the partition plate is located on the base. One of the base plates is located on the base, and the other base plate is located on the pedestal.

8. The circuit breaker according to claim 7, characterized in that, The arc-extinguishing chamber includes two support plates and multiple arc-extinguishing grid plates. The two support plates are symmetrically arranged and there is a gap between the two support plates. The multiple arc-extinguishing grid plates are spaced apart in the gap. The base plate and the two supporting plates are provided with limiting ribs at corresponding positions. When the base and the base are covered, the limiting ribs provided on the base abut against the side of the supporting plate near the base, and the limiting ribs provided on the base abut against the side of the supporting plate near the base.

9. The circuit breaker according to claim 8, characterized in that, It also includes an arc-inducing plate, which is disposed between the two support plates.

10. The circuit breaker according to claim 7, characterized in that, The partition plate disposed on the base has a protrusion on the side facing the base, and the partition plate disposed on the base has a groove on the side facing the base; Alternatively, the partition plate disposed on the base has a groove on the side facing the base, and the partition plate disposed on the base has a protrusion on the side facing the base; When the base and the base are in contact, the protrusion is located within the groove.

Images