A circuit breaker
By designing a U-shaped arc-blocking plate and a limiting structure in the circuit breaker, the problem of low arc-extinguishing efficiency caused by limited internal space of the circuit breaker is solved, and the arc-extinguishing efficiency and reliability are improved without increasing the volume.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DELIXI ELECTRIC
- Filing Date
- 2025-08-19
- Publication Date
- 2026-07-31
AI Technical Summary
The limited internal space of existing circuit breakers results in low arc extinguishing efficiency, which is particularly difficult to improve under high voltage environments.
Without increasing the internal space of the circuit breaker, the volume of the arc-extinguishing chamber is increased by designing a U-shaped arc-blocking plate. An inner cavity and limiting structure are set on the arc-blocking plate, and combined with the top cover clamping and limiting groove, the reliability and arc-extinguishing efficiency of the arc-blocking plate are improved.
Without increasing the size of the circuit breaker, the arc extinguishing efficiency is improved, the damage of the arc to the wiring screws and cables is reduced, and the reliability and safety of use are enhanced.
Smart Images
Figure CN224582239U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electrical equipment technology, and more particularly to a circuit breaker. Background Technology
[0002] Circuit breakers are crucial switching devices in power systems, capable of opening, closing, carrying, and interrupting current in circuits. The arc-extinguishing mechanism is one of the core components of a circuit breaker. It typically includes moving contacts, stationary contacts, an arc-extinguishing chamber, and an arc-damping plate. When a circuit breaker opens, an electric arc is generated between the moving and stationary contacts. This arc is usually transferred to the arc-extinguishing chamber and extinguished there.
[0003] Arc-blocking plates are important auxiliary components of arc-extinguishing mechanisms. Their main function is to control the arc's propagation path through physical isolation and guidance, reduce damage to other components of the circuit breaker caused by the arc, and improve arc-extinguishing efficiency. In existing technologies, the limited internal space of circuit breakers results in relatively low arc-extinguishing efficiency. Utility Model Content
[0004] This application provides a circuit breaker that improves the arc extinguishing efficiency of the circuit breaker without increasing the internal space of the circuit breaker.
[0005] In a first aspect, this application provides a circuit breaker, which includes a base, an arc-extinguishing chamber, and an arc-blocking plate. The base has an installation space inside. The arc-extinguishing chamber is disposed within the installation space and includes an arc-outgoing side. The arc-blocking plate is disposed on the arc-outgoing side and shields it. The arc-blocking plate includes a first side plate, a second side plate, and a base plate. The first side plate, the base plate, and the second side plate are sequentially connected to form a U-shaped structure. The opening of the U-shaped structure faces the arc-extinguishing chamber and communicates with the arc-outgoing side, with a portion of the arc-outgoing side located within the U-shaped structure.
[0006] Through the above-described scheme, the arc-blocking plate of this application is located on the arc-escape side. This plate can block the arc escaping from the arc-extinguishing chamber, reducing damage to the circuit breaker's wiring screws and consequently reducing damage to the cables or copper busbars connected to the screws. The arc-blocking plate is configured as a U-shaped structure formed by the sequential connection of a first side plate, a bottom plate, and a second side plate. This creates an inner cavity within the arc-blocking plate. The opening of the U-shaped structure faces the arc-extinguishing chamber and communicates with the arc-escape side, allowing a portion of the arc-escape side to enter the inner cavity of the arc-blocking plate through the opening. When a portion of the arc-escape side can extend into the inner cavity of the arc-blocking plate, the volume of the arc-extinguishing chamber can be increased, thereby increasing its arc-extinguishing capacity. Increased arc-extinguishing capacity leads to improved arc-extinguishing efficiency of the circuit breaker. Therefore, by providing an inner cavity on the arc-blocking plate, the circuit breaker can accommodate a larger arc-extinguishing chamber, thus improving its arc-extinguishing efficiency without increasing the internal space of the circuit breaker.
[0007] In one possible design, the inner wall of the base is provided with a first limiting groove. The arc-blocking plate also includes limiting blocks. The limiting blocks are disposed on the side of the first side plate away from the second side plate, and / or, the limiting blocks are disposed on the side of the second side plate away from the first side plate. The number of limiting blocks is the same as the number of first limiting grooves and corresponds one-to-one, with the limiting blocks located within the corresponding first limiting grooves.
[0008] Through the above-described scheme, this application provides a first limiting groove on the inner wall of the base and a limiting block on the arc-extinguishing plate. When the limiting block is located within the first limiting groove, the base can limit the arc-extinguishing plate in a second direction and in the opposite direction. This improves the reliability of the arc-extinguishing plate. The second direction can be the arrangement direction of the arc-extinguishing plate and the arc-extinguishing chamber.
[0009] In one possible design, the circuit breaker also includes a top cover disposed on one side of the base. When the top cover is closed with the base, it can clamp an arc-blocking plate in a first direction. This first direction is parallel to the alignment direction of the top cover and the base.
[0010] With the above solution, after the top cover and base are closed, the arc-blocking plate is clamped in the first direction, which can limit the arc-blocking plate in the first direction. Based on the previous description, the first limiting groove and the limiting block cooperate to allow the base to limit the arc-blocking plate in the second direction and the opposite direction of the second direction. When the top cover and base limit the arc-blocking plate in the first direction, the limiting effect of the arc-blocking plate is better, thereby further improving the reliability of the arc-blocking plate.
[0011] In one possible design, the base plate includes an upper section and a lower section. The upper section has multiple vents that penetrate the base plate along a second direction. The cables and copper busbars connected to the circuit breaker are located on the lower section away from the arc-extinguishing chamber, and the lower section can shield the cables and copper busbars. The second direction refers to the arrangement direction of the arc-blocking plate and the arc-extinguishing chamber.
[0012] The above design divides the base plate into upper and lower sections. The upper section has vents, allowing the arc escaping from the arc-emitting side to enter the external environment, thus reducing the possibility of damage to the internal mechanisms of the circuit breaker. The lower section shields the cables and copper busbars, minimizing damage from the arc. By dividing the base plate into sections, the effect of the arc-blocking plate in preventing the arc from escaping is retained, while also reducing the possibility of the arc being completely blocked and damaging the internal mechanisms of the circuit breaker.
[0013] In one possible design, the circuit breaker also includes an arc-blocking plate located on the side of the arc-blocking plate away from the arc-extinguishing chamber, with the arc-blocking plate abutting against the base plate. The projection of the arc-blocking plate in a second direction covers the vent hole.
[0014] With the above design, the arc-blocking plate is located on the side of the arc-blocking plate furthest from the arc-extinguishing chamber, thus preventing the arc-blocking plate's placement from affecting its operation. The projection of the arc-blocking plate in the second direction covers the vent hole, allowing the arc-blocking plate to effectively shield the vent hole. This reduces the likelihood of dust particles from the external environment entering the circuit breaker through the vent hole. The arc-blocking plate's close fit to the base plate reduces the gap between the arc-blocking plate and the arc-blocking plate, further minimizing the possibility of dust particles from the external environment entering the circuit breaker through the vent hole.
[0015] In one possible design, a slot is provided on the side of the base plate away from the arc-extinguishing chamber. The arc-blocking plate is inserted into the slot.
[0016] With the above solution, since the arc-blocking plate is located on the side of the arc-blocking plate away from the arc-extinguishing chamber, and the slot is located on the side of the base plate away from the arc-extinguishing chamber, installation space for the arc-blocking plate can be provided on the base plate. When the arc-blocking plate is inserted into the slot, the base plate can also limit the movement of the arc-blocking plate, which can improve the reliability of the arc-blocking plate and thus improve the reliability of the circuit breaker.
[0017] In one possible design, the inner wall of the base is provided with a second limiting groove. An insert plate is provided on the side wall of the arc-blocking plate. The insert plate is located within the second limiting groove.
[0018] Through the above solution, this application provides a second limiting groove on the inner wall of the base and an insert plate on the arc-blocking plate. When the insert plate is located within the second limiting groove, the base can limit the arc-blocking plate in the second direction and in the opposite direction. This further improves the reliability of the arc-blocking plate.
[0019] In one possible design, the arc-blocking plate also includes a support block. The support block is connected to the end of the base plate away from the top cover. The support block is closer to the arc-extinguishing chamber than the base plate.
[0020] By using the above method, setting up a support block and connecting it to the end of the base plate away from the top cover, the support block can provide support for the U-shaped structure. Since the support block is closer to the arc-extinguishing chamber than the base plate, interference between the support block and the fastening bolts can be reduced.
[0021] In one possible design, the connection between the support block and the base plate is provided with a rounded chamfer.
[0022] With the above scheme, the connection between the support block and the base plate is provided with an arc-shaped chamfer. The arc-shaped chamfer can make the gas escape process smoother when a large amount of gas is generated in the arc-extinguishing chamber. This can not only reduce the residence time of the gas in the arc-extinguishing chamber, but also make the process of the gas carrying the electric arc into the arc-extinguishing chamber smoother, thereby improving the arc-extinguishing efficiency of the circuit breaker.
[0023] In one possible design, the arc-blocking sheet is made of insulating paper.
[0024] Through the above-described method, the insulating paper exhibits excellent dielectric properties, as well as advantages such as high strength and good elasticity. Based on this, the arc-blocking sheet made of insulating paper, when impacted by the electric arc and gas escaping from the arc-extinguishing chamber, can not only deform, allowing the escaping arc and gas to enter the external environment, but also prevents the arc-blocking sheet from becoming charged. This not only extends the service life of the arc-blocking sheet but also effectively improves the safety of the circuit breaker. 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 A cross-sectional view of a circuit breaker provided in an embodiment of this application.
[0027] Figure 3 This is a schematic diagram of the circuit breaker provided in this application embodiment after the top cover has been removed.
[0028] Figure 4 This is a schematic diagram of the arc-blocking plate provided in an embodiment of this application from one viewpoint.
[0029] Figure 5 This is a schematic diagram of the arc-blocking plate provided in an embodiment of this application from another perspective.
[0030] Figure 6 This is a schematic diagram of the structure of the base provided in an embodiment of this application.
[0031] Figure 7 This is a schematic diagram of the arc-blocking plate provided in an embodiment of this application.
[0032] Figure 8 This is an assembly drawing of the arc-blocking plate and arc-blocking sheet provided in the embodiments of this application.
[0033] Explanation of reference numerals in the attached figures:
[0034] 100. Base; 110. First limiting groove; 120. Second limiting groove;
[0035] 200. Top cover;
[0036] 300. Arc extinguishing chamber; 310. Outgoing arc side; 320. Incoming arc side;
[0037] 400, Arc-blocking plate; 410, First side plate; 420, Second side plate; 430, Base plate; 431, Ventilation hole; 432, Slot; 440, Limiting block; 450, Support block;
[0038] 500. Arc-blocking plate; 510. Insert plate;
[0039] 600. Moving contact;
[0040] 700. Static contact;
[0041] OX, first direction; OY, second direction. Detailed Implementation
[0042] 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.
[0043] 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.
[0044] 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.
[0045] 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.
[0046] 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.
[0047] 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.
[0048] 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.
[0049] 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.
[0050] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
[0051] Figure 1 This is a schematic diagram of the overall structure of the circuit breaker provided in the embodiments of this application. Figure 2 A cross-sectional view of a circuit breaker provided in an embodiment of this application. Figure 1 as well as Figure 2 As shown, circuit breakers are important switching devices in power systems, capable of opening, closing, carrying, and interrupting current in circuits.
[0052] The arc-extinguishing mechanism is one of the core components of a circuit breaker. It typically includes a moving contact 600, a stationary contact 700, an arc-extinguishing chamber 300, and an arc-blocking plate 400. When the circuit breaker opens, an electric arc is generated between the moving contact 600 and the stationary contact 700.
[0053] An arc-extinguishing chamber 300 typically includes an arc-entry side 320 and an arc-exit side 310 located opposite each other, with the arc-entry side 320 being closer to the moving contact 600 than the arc-exit side 310. The electric arc generated between the moving contact 600 and the stationary contact 700 can enter the arc-extinguishing chamber 300 from the arc-entry side 320 and be extinguished. The process of the electric arc entering the arc-extinguishing chamber 300 and being extinguished is commonly referred to as arc extinguishing. During arc extinguishing, some of the arc may not be extinguished; this unextinguished portion of the arc will escape from the arc-exit side 310 of the arc-extinguishing chamber 300.
[0054] The arc-exiting side 310 of the arc-extinguishing chamber 300 is also equipped with a circuit breaker wiring screw, which is usually used to connect cables and copper busbars. In order to reduce the damage to cables and copper busbars caused by the electric arc escaping from the arc-extinguishing chamber 300, an arc-blocking plate 400 is usually installed between the wiring screw and the arc-exiting side 310. The arc-blocking plate 400 can block the electric arc escaping from the arc-extinguishing chamber 300.
[0055] In existing technologies, the limited internal space of circuit breakers restricts the size of the arc-extinguishing chamber, thus limiting the arc-extinguishing capability of the circuit breaker. With technological advancements, voltages during operation are increasing, leading to a decrease in the arc-extinguishing efficiency of circuit breakers. This necessitates increasing the volume of the arc-extinguishing chamber to improve efficiency. However, increasing the arc-extinguishing chamber size requires increasing the internal space of the circuit breaker, consequently increasing the overall size of the circuit breaker. In most applications, the space available for installing circuit breakers is limited, making installation increasingly difficult as the circuit breaker's size increases.
[0056] To address the aforementioned issues, this application provides a circuit breaker that can improve the arc-extinguishing efficiency of the circuit breaker without increasing its internal space.
[0057] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
[0058] Figure 3 This is a schematic diagram of the circuit breaker provided in an embodiment of this application after the top cover has been removed. Figure 2 and Figure 3 As shown, this application provides a circuit breaker, which includes a base 100, an arc-extinguishing chamber 300, and an arc-blocking plate 400. The base 100 has an installation space inside. The arc-extinguishing chamber 300 is disposed in the installation space and includes an arc-outward side 310.
[0059] The arc-extinguishing mechanism of the circuit breaker can be installed within the mounting space inside the base 100. Multiple partitions can also be installed within the mounting space of the base 100, dividing the mounting space into several independent mounting spaces, each of which can contain a set of arc-extinguishing mechanisms.
[0060] Figure 4 This is a schematic diagram of the arc-blocking plate provided in an embodiment of this application from one viewpoint. Figure 5 This is a schematic diagram of the arc-blocking plate provided in an embodiment of this application from another perspective. (See diagram below.) Figures 3 to 5 As shown, the arc-blocking plate 400 is disposed on the arc-exiting side 310 and blocks the arc-exiting side 310. The arc-blocking plate 400 includes a first side plate 410, a second side plate 420 and a bottom plate 430. The first side plate 410, the bottom plate 430 and the second side plate 420 are connected in sequence to form a U-shaped structure. The opening of the U-shaped structure faces the arc-extinguishing chamber 300 and is connected to the arc-exiting side 310.
[0061] The base plate 430, the first side plate 410, and the second side plate 420 can all be plate-shaped structures. The first side plate 410 and the second side plate 420 are arranged opposite to each other and spaced apart, with the base plate 430 located between the first side plate 410 and the second side plate 420. In this way, the first side plate 410, the base plate 430, and the second side plate 420 can be connected sequentially, allowing the arc-blocking plate 400 to form a U-shaped structure, with part of the arc-exiting side 310 located within the U-shaped structure.
[0062] When the arc-blocking plate 400 has a U-shaped structure, it has an inner cavity that can communicate with the arc-ejecting side 310 of the arc-extinguishing chamber 300. The arc-ejecting side 310 can extend into the inner cavity of the arc-blocking plate 400 through the opening of the U-shaped structure.
[0063] The U-shaped arc-blocking plate 400 is slightly larger in volume compared to the flat arc-blocking plate 400 in the prior art. For example... Figure 2 As shown, the space occupied by the arc-blocking plate 400 after its volume increase is the space between the arc-extinguishing chamber 300 and the wiring screw. Therefore, it can be concluded that the use of the wiring screw is not affected when the arc-blocking plate 400 is set as a U-shaped structure.
[0064] In summary, the arc-blocking plate 400 of this application is disposed on the arc-escape side 310. The arc-blocking plate 400 can block the arc escaping from the arc-extinguishing chamber 300, thereby reducing the damage caused by the escaping arc to the circuit breaker's wiring screws, and thus reducing the damage caused by the escaping arc to the cables and copper busbars connected to the wiring screws.
[0065] The arc-blocking plate 400 is configured as a U-shaped structure formed by the sequential connection of a first side plate 410, a bottom plate 430, and a second side plate 420. This allows the arc-blocking plate 400 to have an inner cavity. The opening of the U-shaped structure faces the arc-extinguishing chamber 300 and communicates with the arc-ejecting side 310, allowing part of the arc-ejecting side 310 to enter the inner cavity of the arc-blocking plate 400 through the opening of the U-shaped structure. When part of the arc-ejecting side 310 can extend into the inner cavity of the arc-blocking plate 400, the volume of the arc-extinguishing chamber 300 can be increased, thereby increasing the arc-extinguishing capacity of the arc-extinguishing chamber 300. When the arc-extinguishing capacity of the arc-extinguishing chamber 300 increases, the arc-extinguishing efficiency of the circuit breaker can be improved.
[0066] Therefore, by setting an inner cavity on the arc-blocking plate 400, the circuit breaker can accommodate a larger arc-extinguishing chamber 300, thus improving the arc-extinguishing efficiency of the circuit breaker without increasing the internal space of the circuit breaker.
[0067] like Figure 1 , Figure 2 as well as Figure 4 As shown, the arc-blocking plate 400 also includes a support block 450. The support block 450 can be a protrusion structure provided on the arc-blocking plate 400, and the support block 450 is connected to the end of the base plate 430 away from the top cover 200. The support block 450 can provide support for the U-shaped structure.
[0068] Because a stationary contact 700 is provided between the arc-blocking plate 400 and the base 100, the support block 450 is disposed on the stationary contact 700 and in contact with the stationary contact 700. The stationary contact 700 and the base 100 need to be connected by fastening bolts. In order to reduce the interference of the arc-blocking plate 400 with the fastening bolts, the support block 450 can be closer to the arc-extinguishing chamber 300 than the base plate 430.
[0069] In summary, by setting up the support block 450 and connecting it to the end of the base plate 430 away from the top cover 200, the support block 450 can provide support in a U-shaped structure. Since the support block 450 is closer to the arc-extinguishing chamber 300 than the base plate 430, interference between the support block 450 and the fastening bolts can be reduced.
[0070] like Figure 2 , Figure 4 as well as Figure 5 As shown, the connection between the support block 450 and the base plate 430 is provided with an arc-shaped chamfer. The arc-shaped chamfer can be provided at the connection between the support block 450 and the base plate 430 located within the U-shaped structure cavity.
[0071] When the circuit breaker is tripped, an electric arc will be generated between the moving contact 600 and the stationary contact 700. Due to the high heat of the electric arc, the temperature inside the arc-extinguishing chamber 300 will rise, thereby generating a large amount of gas. This will cause the pressure inside the arc-extinguishing chamber 300 to be higher than the pressure of the external environment. The generated gas will enter the external environment from the arc-out side 310.
[0072] The gas transfer process involves the gas entering the arc-extinguishing chamber 300 from the arc-entry side 320, passing through the arc-exit side 310 and the arc-blocking plate 400, and finally entering the external environment. Due to the presence of the arc-blocking plate 400, some gas can enter the external environment, while other gas will return to the arc-extinguishing chamber 300 after contacting the arc-blocking plate 400. During the gas transfer process, the gas can carry the electric arc from the arc-entry side 320 into the arc-extinguishing chamber 300.
[0073] In summary, the connection between the support block 450 and the base plate 430 is provided with an arc-shaped chamfer. The arc-shaped chamfer can make the gas escape process smoother when a large amount of gas is generated in the arc-extinguishing chamber 300. This not only reduces the residence time of the gas in the arc-extinguishing chamber 300, but also makes the process of the gas carrying the electric arc into the arc-extinguishing chamber 300 smoother, thereby improving the arc-extinguishing efficiency of the circuit breaker.
[0074] To improve the reliability of the circuit breaker, this application also improves the limiting of the arc baffle 400. The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.
[0075] Figure 6 This is a schematic diagram of the structure of the base provided in an embodiment of this application. Figure 1 as well as Figures 4 to 6 As shown, the inner wall of the base 100 is provided with a first limiting groove 110. The arc-blocking plate 400 also includes a limiting block 440.
[0076] The first limiting groove 110 can be a blind groove structure opened on the inner wall of the base 100. The first limiting groove 110 can be opened along the arrangement direction of the top cover 200 and the base 100, and the first limiting groove 110 can be connected to the installation space of the base 100.
[0077] There can be one first limiting groove 110, or there can be two first limiting grooves 110. When there is one first limiting groove 110, the first limiting groove 110 can be disposed on the inner wall of the base 100, or the first limiting groove 110 can be disposed on the partition in the installation space. When there are two first limiting grooves 110, the two first limiting grooves 110 can be disposed on two opposite inner walls of the base 100, or one first limiting groove 110 can be disposed on the inner wall of the base 100, and the other first limiting groove 110 can be disposed on the partition.
[0078] The limiting block 440 can be a protrusion structure provided on the arc-blocking plate 400. There can be one or two limiting blocks 440. When there is one limiting block 440, it can be located on the side of the first side plate 410 away from the second side plate 420, or it can be located on the side of the second side plate 420 away from the first side plate 410. When there are two limiting blocks 440, they can be provided on both the side of the first side plate 410 away from the second side plate 420 and the side of the second side plate 420 away from the first side plate 410.
[0079] The arc-blocking plate 400 can be installed into the installation space of the base 100 along the arrangement direction of the top cover 200 and the base 100. During the installation process, the limiting block 440 can slide along the first limiting groove 110 until the arc-blocking plate 400 is installed.
[0080] It should be noted that the number of limiting blocks 440 is the same as the number of first limiting grooves 110 and they correspond one-to-one, and the limiting blocks 440 are located within the corresponding first limiting grooves 110. When the limiting block 440 is located within the first limiting groove 110, the side wall of the limiting block 440 can contact the groove wall of the first limiting groove 110.
[0081] In summary, this application provides a first limiting groove 110 on the inner wall of the base 100 and a limiting block 440 on the arc-blocking plate 400. When the limiting block 440 is located within the first limiting groove 110, the base 100 can limit the arc-blocking plate 400 in the second direction OY and in the opposite direction of the second direction OY. This improves the reliability of the arc-blocking plate 400. The second direction OY can be the arrangement direction of the arc-blocking plate 400 and the arc-extinguishing chamber 300.
[0082] like Figure 1 , Figure 2 , Figure 5 as well as Figure 6 As shown, the circuit breaker also includes a top cover 200, which is disposed on one side of the base 100. The top cover 200 can close with the base 100 to protect the mechanism installed in the installation space.
[0083] After the baffle plate 400 is installed into the mounting space of the base 100, the top cover 200 and the base 100 fit together to clamp the baffle plate 400 in the first direction OX. In this way, the top cover 200 and the base 100 can limit the baffle plate 400 in the first direction OX. The first direction OX is parallel to the arrangement direction of the top cover 200 and the base 100.
[0084] In summary, after the top cover 200 and the base 100 are closed, the arc-blocking plate 400 is clamped in the first direction OX, which can limit the arc-blocking plate 400 in the first direction OX. Based on the above description, the first limiting groove 110 and the limiting block 440 cooperate to allow the base 100 to limit the arc-blocking plate 400 in the second direction OY and the opposite direction of the second direction OY. When the top cover 200 and the base 100 limit the arc-blocking plate 400 in the first direction OX, the limiting effect of the arc-blocking plate 400 is better, thereby further improving the reliability of the arc-blocking plate 400.
[0085] Because some of the arc cannot be extinguished during the arc extinguishing process of the circuit breaker and escapes from the arc extinguishing chamber 300, an arc-blocking plate 400 is installed on the arc-out side 310 of the arc extinguishing chamber 300 to block the escaping arc. However, if this part of the escaping arc is completely blocked by the arc-blocking plate 400, it may damage the internal mechanism of the circuit breaker.
[0086] Therefore, please continue to refer to Figure 1 as well as Figures 3 to 5 As shown, the base plate 430 includes an upper area and a lower area.
[0087] The upper section, near the top cover 200, has multiple vents 431. These vents 431 can penetrate the base plate 430 along the second direction OY, allowing the arc-extinguishing chamber 300 to communicate with the external environment. The vents 431 can be square or round, etc. The electric arc escaping from the arc-escape side 310 can enter the external environment through the vents 431.
[0088] Because the terminal screw is located on the base 100, and the lower zone is close to the base 100, the cable and copper busbar connected to the terminal screw can be located on the side of the lower zone away from the arc-extinguishing chamber 300. The lower zone can shield the cable and copper busbar, preventing the escaping arc from contacting them.
[0089] In summary, the base plate 430 is divided into an upper section and a lower section. The upper section is equipped with a vent 431, allowing the electric arc escaping from the arc-escape side 310 to enter the external environment through the vent 431. This reduces the possibility of the escaping arc damaging the internal mechanism of the circuit breaker. The lower section can shield the cables and copper busbars, reducing the damage caused by the escaping arc to them. By dividing the base plate 430 into sections, the effect of the arc-blocking plate 400 in blocking the escaping arc is retained, while also reducing the possibility of the escaping arc being completely blocked and damaging the internal mechanism of the circuit breaker.
[0090] Figure 7 This is a schematic diagram of the arc-blocking plate provided in an embodiment of this application. Figure 8 This is an assembly drawing of the arc-blocking plate and arc-blocking sheet provided in an embodiment of this application. Figure 3 , Figure 4 , Figure 7 as well as Figure 8 As shown, to improve the dustproof effect of the circuit breaker, this application also provides an arc-blocking plate 500 inside the circuit breaker. The arc-blocking plate 500 is located on the side of the arc-blocking plate 400 away from the arc-extinguishing chamber 300, and the arc-blocking plate 400 is attached to the base plate 430. The projection of the arc-blocking plate 500 in the second direction OY covers the vent hole 431.
[0091] The arc-blocking plate 500 can be arranged parallel to the arc-blocking plate 400, and the arc-blocking plate 400 can be located between the arc-blocking plate 500 and the arc-exiting side 310. The arc-blocking plate 500 can be attached to the side of the arc-blocking plate 400 away from the arc-exiting side 310. When the arc-blocking plate 500 is installed on the circuit breaker, the arc-blocking plate 500 can block the upper area of the base plate 430.
[0092] When the circuit breaker is in its normal operating state, the arc-blocking plate 500 is in contact with the base plate 430. When the circuit breaker trips, the electric arc and gas escaping from the arc-extinguishing chamber 300 impact the arc-blocking plate 500 through the vent 431. At this time, the arc-blocking plate 500 bends in the opposite direction of the second direction OY, creating a gap between the arc-blocking plate 500 and the arc-blocking plate 400, allowing the gas and electric arc to enter the external environment through this gap. After the gas and the escaping electric arc enter the external environment, the arc-blocking plate 500 can reset along the second direction OY according to its own characteristics until it is in contact with the base plate 430.
[0093] The arc-blocking sheet 500 can be made of insulating paper. For example, the arc-blocking sheet 500 can be made of meta-aromatic polyamide fiber paper (NOMEX paper) or TFT composite paper.
[0094] Insulating paper possesses excellent dielectric properties, as well as advantages such as high strength and good elasticity. Based on this, the arc-blocking sheet 500 made of insulating paper, when impacted by the electric arc and gas escaping from the arc-extinguishing chamber 300, can not only deform, allowing the escaping arc and gas to enter the external environment, but also prevent the arc-blocking sheet 500 from becoming charged. This not only extends the service life of the arc-blocking sheet 500 but also effectively improves the safety of the circuit breaker.
[0095] In summary, the arc-blocking plate 500 is located on the side of the arc-blocking plate 400 away from the arc-extinguishing chamber 300, which avoids the arc-blocking plate 400's operation being affected by its placement. The projection of the arc-blocking plate 500 in the second direction OY covers the vent hole 431, allowing the arc-blocking plate 500 to shield the vent hole 431. This reduces the possibility of dust particles from the external environment entering the circuit breaker through the vent hole 431. The arc-blocking plate 500's close contact with the base plate 430 reduces the gap between the arc-blocking plate 500 and the arc-blocking plate 400, further reducing the possibility of dust particles from the external environment entering the circuit breaker through the vent hole 431.
[0096] The method of fixing the arc-blocking plate 500 mentioned in this application will be described in detail below with reference to the accompanying drawings.
[0097] Please continue to refer to Figure 1 , Figure 4 , Figure 7 as well as Figure 8 As shown, a slot 432 is provided on the side of the base plate 430 away from the arc-extinguishing chamber 300. The arc-blocking plate 500 is inserted into the slot 432.
[0098] The slot 432 can be a blind slot structure opened on the base plate 430 along the arrangement direction of the top cover 200 and the base 100. The part of the arc-blocking plate 500 that blocks the vent 431 is located outside the slot 432, so that the part of the arc-blocking plate 500 that blocks the vent 431 will not be limited by the slot 432 and can deform, thus making room for the escaped electric arc and gas to communicate with the external environment.
[0099] In summary, because the arc-blocking plate 500 is located on the side of the arc-blocking plate 400 away from the arc-extinguishing chamber 300, the slot 432 is located on the side of the base plate 430 away from the arc-extinguishing chamber 300, allowing for installation space on the base plate 430 for the arc-blocking plate 500. When the arc-blocking plate 500 is inserted into the slot 432, the base plate 430 can also limit the movement of the arc-blocking plate 500, thus improving the reliability of the arc-blocking plate 500 and consequently enhancing the reliability of the circuit breaker.
[0100] Furthermore, such as Figure 1 as well as Figures 4 to 6 As shown, the inner wall of the base 100 is provided with a second limiting groove 120. The side wall of the arc-blocking plate 500 is provided with an insert plate 510. The insert plate 510 is located within the second limiting groove 120.
[0101] The second limiting groove 120 can be a blind groove structure opened on the inner wall of the base 100. The second limiting groove 120 can be opened along the arrangement direction of the top cover 200 and the base 100, and the second limiting groove 120 can be connected to the installation space of the base 100. The second limiting groove 120 is farther away from the arc-extinguishing chamber 300 than the first limiting groove 110.
[0102] There can be one or two second limiting grooves 120. When there is one second limiting groove 120, it can be located on the inner wall of the base 100 or on a partition within the installation space. When there are two second limiting grooves 120, they can be located on opposite inner walls of the base 100, or one can be located on the inner wall of the base 100 and the other on a partition.
[0103] The insert plate 510 can be a protruding structure provided on the side wall of the arc-blocking plate 500. There can be one insert plate 510 or two insert plates 510. When there is one insert plate 510, it can be provided on one of the side walls of the arc-blocking plate 500. When there are two insert plates 510, they can be provided on both opposite side walls of the arc-blocking plate 500.
[0104] The arc-blocking plate 500 can be installed into the installation space of the base 100 along the arrangement direction of the top cover 200 and the base 100. During the installation of the arc-blocking plate 500, the insert plate 510 can slide along the second limiting groove 120 until the arc-blocking plate 500 is installed.
[0105] It should be noted that the number of insert plates 510 is the same as the number of second limiting grooves 120 and they correspond one-to-one, and the insert plates 510 are located in the corresponding second limiting grooves 120. When the insert plate 510 is located in the second limiting groove 120, the side wall of the insert plate 510 can contact the groove wall of the second limiting groove 120.
[0106] In some possible embodiments, a portion of the insert plate 510 is located within the slot 432, and the slot 432 has a notch on the groove wall near the inner wall of the base 100, through which the portion of the insert plate 510 can extend out of the slot 432 and enter into the second limiting groove 120.
[0107] In summary, this application provides a second limiting groove 120 on the inner wall of the base 100 and an insert plate 510 on the arc-blocking plate 500. When the insert plate 510 is located within the second limiting groove 120, the base 100 can limit the arc-blocking plate 500 in the second direction OY and in the opposite direction of the second direction OY. This further improves the reliability of the arc-blocking plate 500.
Claims
1. A circuit breaker, characterized in that, include: The base has an internal installation space; An arc-extinguishing chamber is disposed within the installation space, and the arc-extinguishing chamber includes an arc-ejecting side; An arc-blocking plate is disposed on the arc-exiting side and blocks the arc-exiting side. The arc-blocking plate includes a first side plate, a second side plate, and a bottom plate. The first side plate, the bottom plate, and the second side plate are connected in sequence to form a U-shaped structure. The opening of the U-shaped structure faces the arc-extinguishing chamber and communicates with the arc-exiting side. Part of the arc-exiting side is located inside the U-shaped structure.
2. The circuit breaker according to claim 1, characterized in that, The inner wall of the base is provided with a first limiting groove; The arc-blocking plate also includes a limiting block; The limiting block is disposed on the side of the first side plate away from the second side plate, and / or the limiting block is disposed on the side of the second side plate away from the first side plate; The number of the limiting blocks is the same as the number of the first limiting slots and they correspond one-to-one. The limiting blocks are located in the corresponding first limiting slots.
3. The circuit breaker according to claim 1, characterized in that, It also includes a top cover, which is disposed on one side of the base; When the top cover is closed with the base, it can clamp the arc-blocking plate in the first direction; Wherein, the first direction is parallel to the arrangement direction of the top cover and the base.
4. The circuit breaker according to any one of claims 1-3, characterized in that, The base plate includes an upper section and a lower section; The upper area is provided with a plurality of ventilation holes, and the plurality of ventilation holes penetrate the bottom plate along the second direction; The cable and copper busbar connected to the circuit breaker are located on the side of the lower zone away from the arc-extinguishing chamber, and the lower zone can shield the cable and copper busbar. The second direction refers to the arrangement direction of the arc-blocking plate and the arc-extinguishing chamber.
5. The circuit breaker according to claim 4, characterized in that, It also includes an arc-blocking plate, which is located on the side of the arc-blocking plate away from the arc-extinguishing chamber, and the arc-blocking plate is in contact with the base plate; The projection of the arc-blocking plate in the second direction covers the air vent.
6. The circuit breaker according to claim 5, characterized in that, The base plate has a slot on the side away from the arc-extinguishing chamber; The arc-blocking plate is inserted into the slot.
7. The circuit breaker according to claim 5, characterized in that, The inner wall of the base is provided with a second limiting groove; The side wall of the arc-blocking plate is provided with an insert plate; The insert plate is located within the second limiting groove.
8. The circuit breaker according to claim 3, characterized in that, The arc-blocking plate also includes a support block; The support block is connected to the end of the base plate away from the top cover; The support block is closer to the arc-extinguishing chamber than the base plate.
9. The circuit breaker according to claim 8, characterized in that, The connection between the support block and the base plate is provided with an arc-shaped chamfer.
10. The circuit breaker according to claim 5, characterized in that, The arc-blocking sheet is made of insulating paper.