Reverse spraying prevention device and circuit breaker

Abstract

The utility model provides a reverse spraying prevention device and a circuit breaker, and belongs to the technical field of electrical equipment. The utility model provides a reverse spraying prevention device which is applied to a circuit breaker, the circuit breaker comprises a moving contact, and the reverse spraying prevention device comprises a shell and a reverse spraying prevention plate. A containing cavity is formed in the shell and comprises an operation space and an arc extinguishing space, the operation space and the arc extinguishing space are separated through a partition plate, and the partition plate is provided with a through groove for the moving contact to move. The reverse spraying prevention plate shields the through groove and is provided with an avoiding groove for the moving contact to move. And a labyrinth groove is formed between the reverse spraying prevention plate and the partition plate. According to the circuit breaker, the through groove in the partition plate is shielded by arranging the reverse spraying prevention plate, and the influence of high-temperature airflow on the operating mechanism in the arc extinguishing process of the circuit breaker can be reduced. And the labyrinth groove formed between the reverse spraying prevention plate and the partition plate can reduce the dissipation degree of high-temperature airflow from the arc extinguishing space to the operation space, so that the influence of the high-temperature airflow on the operation mechanism can be reduced, and the use reliability of the circuit breaker is ensured.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and in particular to an anti-backflow device and a circuit breaker. Background Technology

[0002] With social and economic development, the power system has become increasingly important in the national economy. People's demand for electricity is growing, and to promote the rapid development of the power industry, various protective devices for circuit protection have emerged. Among them, the circuit breaker is one of the most common circuit protectors, used for overload and short-circuit protection. That is, when a short circuit or overload occurs, the circuit breaker can automatically disconnect the circuit, thus protecting it.

[0003] During the process of cutting off the circuit, the circuit breaker generates a large number of electric arcs. The generation of electric arcs is accompanied by high temperature and high pressure. If the arcs are not evacuated and extinguished in time, they can easily break down or burn out the circuit breaker, seriously affecting the power safety of the line and users, as well as the breaking capacity of the molded case circuit breaker.

[0004] Existing circuit breakers have an outlet on one side of their arc-extinguishing space that connects to the external environment, and a notch on the other side that connects to the operating space. When the circuit breaker breaks, an electric arc is generated. The pressure difference between the arc-extinguishing space and the outside environment forces the arc gas to flow towards the outlet and eventually into the external environment. At the same time, a reverse airflow may be generated, which transmits high-temperature ionized gas and metal particles through the notch to the operating mechanism. This can ablate the springs inside the operating mechanism, and the metal particles may also adhere to the structural components inside the operating mechanism, causing jamming or damage to the components, thus affecting the performance and use of the circuit breaker. Utility Model Content

[0005] This application provides an anti-backflow device and a circuit breaker to reduce the damage to the operating mechanism caused by high-temperature free gas and metal particles.

[0006] In a first aspect, this application provides an anti-backflow device applied to a circuit breaker. The circuit breaker includes a moving contact, and the anti-backflow device includes a housing and an anti-backflow plate. The housing has an internal receiving cavity, which includes an operating space and an arc-extinguishing space. The operating space and the arc-extinguishing space are separated by a partition, and the partition has a through groove for the moving contact to move. The anti-backflow plate blocks the through groove and has a clearance groove for the moving contact to move. A labyrinth groove is formed between the anti-backflow plate and the partition.

[0007] Through the above-described solution, this application establishes an operating space and an arc-extinguishing space within the casing, and uses a partition to separate the operating space and the arc-extinguishing space. This isolates the operating mechanism from the arc-extinguishing chamber, reducing the impact of high-temperature airflow on the operating mechanism during arc extinguishing. Furthermore, the through-slots on the partition reduce the influence of the partition on the movement of the moving contacts, improving the reliability of the circuit breaker.

[0008] Based on this, this application also provides an anti-backflow plate to block the through slots on the baffle, which can further reduce the impact of high-temperature airflow on the operating mechanism during the arc extinguishing process of the circuit breaker, and ensure the reliability of the circuit breaker.

[0009] More importantly, in this application, a labyrinth groove is formed between the anti-backflow plate and the baffle. Thus, for the high-temperature airflow to enter the operating space from the arc-extinguishing space, it must bypass the labyrinth groove from one side to the other. It is evident that the labyrinth groove extends the path of the high-temperature airflow from the arc-extinguishing space to the operating space, increasing the difficulty of this transition. Therefore, the labyrinth groove between the anti-backflow plate and the baffle effectively reduces the dispersion of the high-temperature airflow from the arc-extinguishing space to the operating space, thereby reducing the impact of the high-temperature airflow on the operating mechanism and ensuring the reliability of the circuit breaker.

[0010] In one possible design, both opposite walls of the through channel are provided with first sliding grooves. The anti-backflow plate contacts the wall of the first sliding groove.

[0011] The above scheme involves providing first sliding grooves on both opposite walls of the through slot, ensuring that both side walls of the anti-backflow plate are located within these grooves, forming a labyrinthine groove between the anti-backflow plate and the first sliding groove. This reduces the escape of high-temperature gas generated in the arc-extinguishing chamber from the arc-extinguishing space to the operating space during the circuit breaker's tripping process. The anti-backflow plate is in contact with the groove wall of the first sliding groove, minimizing the gap between them and reducing the probability of high-temperature gas escaping into the operating space along this gap. This reduces the impact of high-temperature gas on the operating mechanism, improving the reliability of the circuit breaker.

[0012] In one possible design, a second groove is provided on both sides of the anti-backflow plate. The wall of the through groove contacts the wall of the second groove.

[0013] The above-described design incorporates second sliding grooves on both sides of the anti-backflow plate, allowing it to engage with the through-groove on the partition plate, thus forming a labyrinth between the anti-backflow plate and the second sliding groove. This reduces the escape of high-temperature gas generated in the arc-extinguishing chamber from the arc-extinguishing space to the operating space during the circuit breaker's tripping process. The anti-backflow plate contacts the groove wall of the second sliding groove, minimizing the gap between them and reducing the probability of high-temperature gas escaping into the operating space along this gap. This reduces the impact of high-temperature gas on the operating mechanism, improving the reliability of the circuit breaker.

[0014] In one possible design, the housing includes a top cover and a base, with the top cover abutting the base. The anti-backflow guard includes a first plate and a second plate, at least one of which has a clearance groove. The top cover has a first mounting groove, and the base has a second mounting groove. The first plate is partially located within the first mounting groove, and the second plate is partially located within the second mounting groove.

[0015] By employing the above-described scheme, this application designs the housing in a form where the top cover and base fit together, which facilitates the installation of internal components of the circuit breaker and reduces the difficulty of installing these components. A first mounting groove is provided within the top cover to provide a mounting position for the first plate, and a second mounting groove is provided within the base to provide a mounting position for the second plate. By configuring the anti-backflow plate as a combination of the first and second plates, it is no longer necessary to separately mount the anti-backflow plate onto the moving contact. The installation of the anti-backflow plate is completed simply by first mounting the first plate onto the top cover, then mounting the second plate onto the base, and finally fitting the top cover and base together. This reduces the difficulty of installing the anti-backflow plate and makes it more convenient to install.

[0016] In one possible design, a first elastic element is provided in a first mounting groove, and a second elastic element is provided in a second mounting groove. One end of a first plate located in the first mounting groove is connected to the first elastic element, and one end of a second plate located in the second mounting groove is connected to the second elastic element.

[0017] Through the above solution, this application provides a first elastic element in the first mounting groove, and connects one end of the first plate located in the first mounting groove to the first elastic element. A second elastic element is provided in the second mounting groove, and connects one end of the second plate located in the second mounting groove to the second elastic element. Thus, during the circuit breaker's opening and closing process, under the elastic force of the first and second elastic elements, the first and second plates can move together with the moving contact. The first and second plates can enclose the moving contact, thus blocking high-temperature gas on both the side of the moving contact facing the top cover and the side facing the base. This reduces the probability of damage to the operating mechanism caused by high-temperature gas and improves the reliability of the circuit breaker.

[0018] In one possible design, the first and second plates are staggered in the arrangement direction of the operating space and the arc-extinguishing space. The portion of the first plate outside the first mounting groove and the portion of the second plate outside the second mounting groove slide in contact, forming a labyrinth groove between the first plate, the second plate, and the partition. The moving contact contacts the groove wall of the clearance groove.

[0019] With the above scheme, the first plate and the second plate are staggered, and the part of the first plate outside the first mounting groove and the part of the second plate outside the second mounting groove slide in contact. This allows the partition, the first plate and the second plate to form a triple overlap in the arrangement direction of the operating space and the arc extinguishing space, thereby increasing the path of the labyrinth groove, further reducing the degree of high temperature gas escape from the arc extinguishing space to the operating space, reducing the impact of high temperature gas on the operating mechanism, and thus improving the reliability of the circuit breaker.

[0020] In one possible design, the top cover has a first mounting portion, and a first mounting groove is located in the first mounting portion. The first mounting portion has a guide slope on the side facing the base. When the first plate moves with the moving contact until it is completely within the first mounting groove, the moving contact is in contact with the guide slope.

[0021] With the above solution, when the moving contact drives the first plate to move completely into the first mounting groove, the guide slope can be completely fitted with the moving contact. This reduces the gap between the moving contact and the top cover, thereby reducing the probability of high-temperature gas escaping into the operating space through the gap. This reduces the impact of high-temperature gas on the operating mechanism and improves the reliability of the circuit breaker.

[0022] In one possible design, the base has a second mounting portion, and a second mounting groove is located in the second mounting portion. The second mounting portion has a limiting surface on the side facing the top cover. When the second plate moves with the moving contact until it is fully located in the second mounting groove, the moving contact is in contact with the limiting surface.

[0023] With the above solution, when the moving contact drives the second plate to move completely into the second mounting slot, the moving contact can be completely fitted with the limiting surface. This reduces the gap between the moving contact and the base, thereby reducing the probability of high-temperature gas escaping into the operating space through the gap. Furthermore, the limiting surface provides support for the moving contact, reducing the probability of damage to the suspended part of the moving contact due to lack of support, and lowering the maintenance cost of the circuit breaker in the later stages.

[0024] In one possible design, a first limiting post is provided in the first mounting groove, and a second limiting post is provided in the second mounting groove. A first limiting hole is provided on the side of the first plate facing the top cover, and the first limiting post is located in the first limiting hole. A second limiting hole is provided on the side of the second plate facing the base, and the second limiting post is located in the second limiting hole.

[0025] Through the above scheme, the first limiting post, in conjunction with the first limiting hole, can limit the movement of the first plate, reducing the probability of the first plate tilting during the movement of the moving contact. Similarly, the second limiting post, in conjunction with the second limiting hole, can limit the movement of the second plate, reducing the probability of the second plate tilting during the movement of the moving contact. This improves the reliability of the anti-backflow plate.

[0026] Secondly, this application provides a circuit breaker, which includes a moving contact, an operating mechanism, an arc-extinguishing chamber, and the anti-backflow device mentioned in the first aspect. The operating mechanism is located within the operating space of the anti-backflow device and is connected to the moving contact. The arc-extinguishing chamber is located within the arc-extinguishing space of the anti-backflow device and is in communication with the outside of the anti-backflow device.

[0027] The circuit breaker provided in the second aspect above has the same beneficial effects as the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal structure of a circuit breaker provided in an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the structure of the base provided in an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the anti-backflow plate provided in an embodiment of this application.

[0031] Figure 4 This is a schematic diagram of the top cover provided in an embodiment of this application.

[0032] Figure 5 This is an assembly diagram of the base and the second plate provided in an embodiment of this application.

[0033] Figure 6 This is a schematic diagram of the structure of the top cover assembly first plate provided in an embodiment of this application.

[0034] Figure 7 This is a schematic diagram of the structure of the first plate provided in an embodiment of this application.

[0035] Figure 8 This is a schematic diagram of the structure of the second plate provided in an embodiment of this application.

[0036] Figure 9 An exploded view of the top cover, the first elastic member, and the first plate provided in an embodiment of this application.

[0037] Figure 10An exploded view of the base, the second elastic member, and the second plate provided in an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100. Housing; 110. Operating space; 120. Arc extinguishing space; 130. Partition; 140. Through groove; 150. Top cover; 151. First mounting groove; 152. First limiting post; 160. Base; 161. Second mounting groove; 162. Second limiting post; 170. First mounting part; 180. Second mounting part;

[0040] 200, Anti-backflow plate; 210, Clearance groove; 220, First plate; 221, First limiting hole; 230, Second plate; 231, Second limiting hole;

[0041] 300. First elastic element;

[0042] 400. Second elastic element;

[0043] 500. Moving contact;

[0044] 600. Operating mechanism. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Figure 1 This is a schematic diagram of the internal structure of a circuit breaker provided in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of the base provided in an embodiment of this application. Figure 1 as well as Figure 2 As shown, this application provides a circuit breaker, which includes a moving contact 500, an operating mechanism 600, an arc-extinguishing chamber, and an anti-backflow device. The operating mechanism 600 is located within the operating space 110 of the anti-backflow device and is connected to the moving contact 500. The arc-extinguishing chamber is located within the arc-extinguishing space 120 of the anti-backflow device and is in communication with the outside of the anti-backflow device.

[0055] The circuit breaker includes a housing 100, which not only provides support for the internal components of the circuit breaker, but also protects the internal components of the circuit breaker.

[0056] The housing 100 has an internal cavity, which is the installation space inside the housing 100. The cavity includes an operating space 110 and an arc extinguishing space 120. The operating mechanism 600 can be installed in the operating space 110 and the arc extinguishing chamber can be installed in the arc extinguishing space 120.

[0057] The operating mechanism 600 is usually connected to the moving contact 500 to control the movement of the moving contact 500, thereby enabling the circuit breaker to open or close. During the opening process of the circuit breaker, an electric arc is generated. The arc-extinguishing chamber can quickly extinguish the generated arc to reduce the damage to the internal components of the circuit breaker caused by the arc.

[0058] In existing technologies, magnetic blowout is commonly used to extinguish the arc generated during the circuit breaker's opening process. During this process, a large amount of high-temperature airflow is generated within the arc-extinguishing chamber. Since the operating space 110 is connected to the arc-extinguishing space 120, this high-temperature airflow may enter the operating space 110, damaging the components within. Alternatively, this high-temperature airflow may carry metal particles from inside the housing 100 into the operating space 110, contaminating the components. Therefore, this application provides an anti-backflow device to address these problems.

[0059] The anti-backflow device mentioned in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0060] Figure 3 This is a schematic diagram of the anti-backflow plate provided in an embodiment of this application. Figures 1 to 3As shown, this application provides an anti-backflow device applied to a circuit breaker. The circuit breaker includes a moving contact 500, and the anti-backflow device includes a housing 100 and an anti-backflow plate 200. The housing 100 has an internal cavity, which includes an operating space 110 and an arc-extinguishing space 120. The operating space 110 and the arc-extinguishing space 120 are separated by a partition 130, which has a through groove 140 for the moving contact 500 to move. The anti-backflow plate 200 blocks the through groove 140 and has a clearance groove 210 for the moving contact 500 to move. A labyrinth groove is formed between the anti-backflow plate 200 and the partition 130.

[0061] The housing 100 is hollow inside, and the interior portion of the housing 100 serves as the receiving cavity, which can house multiple internal components of the circuit breaker. The operating space 110 and the arc-extinguishing space 120 can be two relatively independent spaces, separated by a partition 130. Since one end of the moving contact 500 is connected to the operating mechanism 600 located in the operating space 110, and the other end of the moving contact 500 is located in the arc-extinguishing chamber within the arc-extinguishing space 120, a through slot 140 for the moving contact 500 to move can be provided on the partition 130.

[0062] The anti-backflow plate 200 can be plate-shaped and can block the through-slot 140 on the partition 130. The anti-backflow plate 200 can be located within the operating space 110, or within the arc-extinguishing space 120, or on the same plane as the partition 130. The anti-backflow plate 200 can simultaneously block both the partition 130 and the through-slot 140, or it can be snapped onto the partition 130 and block the through-slot 140. Since the anti-backflow plate 200 blocks the through-slot 140, to avoid interference with the movement of the moving contact 500, a clearance groove 210 for the movement of the moving contact 500 can be provided on the anti-backflow plate 200.

[0063] Regardless of the location of the anti-backflow baffle 200, a labyrinth groove can be formed between the anti-backflow baffle 200 and the partition 130. A labyrinth groove is a special sealing structure widely used in various mechanical devices, such as gas turbines, bearing seals, and liquid rocket engine turbopumps. The main function of the labyrinth groove is to reduce fluid leakage through its complex channel structure, thereby improving equipment efficiency and safety. In this application, the labyrinth groove can reduce the possibility of high-temperature gas escaping from the arc-extinguishing space 120 into the operating space 110.

[0064] In summary, this application provides an operating space 110 and an arc-extinguishing space 120 inside the housing 100, and a partition 130 separates the operating space 110 and the arc-extinguishing space 120. This isolates the operating mechanism 600 from the arc-extinguishing chamber, reducing the impact of high-temperature airflow on the operating mechanism 600 during arc extinguishing. Furthermore, the through-slot 140 on the partition 130 reduces the impact of the partition 130 on the movement of the moving contact 500, improving the reliability of the circuit breaker.

[0065] Based on this, this application also provides an anti-backflow plate 200 to shield the through slot 140 on the partition plate 130, which can further reduce the impact of high-temperature airflow on the operating mechanism 600 during the arc extinguishing process of the circuit breaker, and ensure the reliability of the circuit breaker.

[0066] More importantly, in this application, a labyrinth groove is formed between the anti-backflow plate 200 and the partition plate 130. Thus, for the high-temperature airflow to enter the operating space 110 from the arc-extinguishing space 120, it needs to bypass the labyrinth groove from one side to the other. It is evident that the labyrinth groove extends the path of the high-temperature airflow from the arc-extinguishing space 120 to the operating space 110, increasing the difficulty of this process. Therefore, the labyrinth groove formed between the anti-backflow plate 200 and the partition plate 130 effectively reduces the dispersion of the high-temperature airflow from the arc-extinguishing space 120 to the operating space 110, thereby reducing the impact of the high-temperature airflow on the operating mechanism 600 and ensuring the reliability of the circuit breaker.

[0067] There are multiple ways to form a labyrinth groove between the anti-backflow plate 200 and the partition plate 130. Two of these arrangements will be described in detail below with reference to the accompanying drawings, but this does not constitute a limitation on the embodiments of this application.

[0068] The first setting method is as follows: Figure 2 as well as Figure 3 As shown, both opposite walls of the through groove 140 are provided with first sliding grooves. The anti-backflow plate 200 is in contact with the wall of the first sliding groove.

[0069] The through groove 140 can be U-shaped or concave, and includes a groove bottom and two corresponding groove walls. A first sliding groove can be provided on each of the two corresponding groove walls of the through groove 140.

[0070] The first groove can be a recessed structure provided on the wall of the through groove 140. One sidewall of the anti-reverse spray plate 200 can be located in the first groove provided on one sidewall of the through groove 140, and the other sidewall of the anti-reverse spray plate 200 can be located in the first groove provided on the other sidewall of the through groove 140. In this way, a labyrinth groove can be formed between the anti-reverse spray plate 200 and the first groove.

[0071] When the first configuration is selected, a first sliding groove is provided on both opposite walls of the through groove 140, so that both side walls of the anti-backflow plate 200 are located within the first sliding groove, forming a labyrinth between the anti-backflow plate 200 and the first sliding groove. This reduces the degree of escape of high-temperature gas generated in the arc-extinguishing chamber from the arc-extinguishing space 120 to the operating space 110 during the circuit breaker's tripping process. The anti-backflow plate 200 is in contact with the groove wall of the first sliding groove, which reduces the gap between the anti-backflow plate 200 and the groove wall of the first sliding groove, thereby reducing the probability of high-temperature gas escaping into the operating space 100 along the gap between the anti-backflow plate 200 and the groove wall of the first sliding groove. This reduces the impact of high-temperature gas on the operating mechanism 600, improving the reliability of the circuit breaker.

[0072] The second setting method is as follows: Figure 2 as well as Figure 3 As shown, the anti-backflow plate 200 has second sliding grooves on both sides. The groove wall of the through groove 140 is in contact with the groove wall of the second sliding groove.

[0073] The anti-reverse spray plate 200 has second sliding grooves on both sides of the groove wall facing the through groove 140. The second sliding grooves can be recessed structures on both sides of the anti-reverse spray plate 200. One groove wall of the through groove 140 is located in the second sliding groove on one side of the anti-reverse spray plate 200, and the other groove wall of the through groove 140 is located in the second sliding groove on the other side of the anti-reverse spray plate 200. In this way, a labyrinth groove can be formed between the anti-reverse spray plate 200 and the second sliding groove.

[0074] When the second configuration is selected, the anti-backflow plate 200 has second sliding grooves on both sides, allowing the anti-backflow plate 200 to engage with the through groove 140 on the partition plate 130, thus forming a labyrinth between the anti-backflow plate 200 and the second sliding groove. This reduces the degree of escape of high-temperature gas generated in the arc-extinguishing chamber from the arc-extinguishing space 120 to the operating space 110 during the circuit breaker's tripping process. The anti-backflow plate 200 is in contact with the groove wall of the second sliding groove, reducing the gap between them and thus decreasing the probability of high-temperature gas escaping into the operating space 100 along this gap. This reduces the impact of high-temperature gas on the operating mechanism 600, improving the reliability of the circuit breaker.

[0075] Figure 4 This is a schematic diagram of the top cover provided in an embodiment of this application. Figure 5 This is an assembly diagram of the base and the second plate provided in an embodiment of this application. Figure 6 This is a schematic diagram of the structure of the top cover assembly first plate provided in an embodiment of this application. Figure 7 This is a schematic diagram of the structure of the first plate provided in an embodiment of this application. Figure 8 This is a schematic diagram of the structure of the second plate provided in an embodiment of this application. Figure 2 as well as Figures 4 to 8 As shown, the housing 100 includes a top cover 150 and a base 160, with the top cover 150 covering the base 160. The anti-backflow plate 200 includes a first plate 220 and a second plate 230, at least one of which has a clearance groove 210. The top cover 150 has a first mounting groove 151, and the base 160 has a second mounting groove 161. The first plate 220 is partially located within the first mounting groove 151, and the second plate 230 is partially located within the second mounting groove 161.

[0076] The top cover 150 has an installation space inside, and the base 160 also has an installation space inside. When the top cover 150 and the base 160 are closed, they can form a housing 100. The installation space inside the top cover 150 and the installation space inside the base 160 can be combined to form a receiving cavity inside the housing 100.

[0077] The first plate 220 can be a plate-like structure, and the second plate 230 can also be a plate-like structure. The first plate 220 and the second plate 230 can be the same size and shape. The first plate 220 and the second plate 230 can be spliced ​​together to form an anti-backflow plate 200. The clearance groove 210 can be provided at the end of the first plate 220 near the second plate 230, or the clearance groove 210 can be provided at the end of the second plate 230 near the first plate 220, or clearance grooves 210 can be provided at both the end of the first plate 220 near the second plate 230 and the end of the second plate 230 near the first plate 220.

[0078] The first mounting groove 151 can be a recessed structure with the top cover 150 facing the base 160, and the first plate 220 is disposed within this recessed structure. The second mounting groove 161 can be a recessed structure with the base 160 facing the top cover 150, and the second plate 230 can be disposed within this recessed structure. When the top cover 150 and the base 160 are closed, the first plate 220 and the second plate 230 can be combined to form the anti-backflow plate 200.

[0079] In summary, this application's design of the housing 100 with the top cover 150 and base 160 overlapping facilitates the installation of internal circuit breaker components and reduces the difficulty of installation. A first mounting groove 151 within the top cover 150 provides a mounting position for the first plate 220, and a second mounting groove 161 within the base 160 provides a mounting position for the second plate 230. By combining the first plate 220 and the second plate 230, the anti-backflow plate 200 no longer needs to be fitted onto the moving contact 500. Installation is simply a matter of first mounting the first plate 220 onto the top cover 150, then mounting the second plate 230 onto the base 160, and finally overlapping the top cover 150 and base 160. This reduces the installation difficulty of the anti-backflow plate 200 and makes its installation more convenient.

[0080] Figure 9 An exploded view of the top cover, the first elastic member, and the first plate provided in an embodiment of this application. Figure 10 An exploded view of the base, second elastic member, and second plate provided in an embodiment of this application. Figure 1 , Figure 9 as well as Figure 10 As shown, a first elastic element 300 is provided in the first mounting groove 151, and a second elastic element 400 is provided in the second mounting groove 161. One end of the first plate 220 located in the first mounting groove 151 is connected to the first elastic element 300, and one end of the second plate 230 located in the second mounting groove 161 is connected to the second elastic element 400.

[0081] The first elastic element 300 can be a spring. One end of the first elastic element 300 is connected to the bottom of the first mounting groove 151, and the other end of the first elastic element 300 is connected to the end of the first plate 220 located in the first mounting groove 151.

[0082] The second elastic element 400 can be a spring. One end of the second elastic element 400 is connected to the bottom of the second mounting groove 161, and the other end of the second elastic element 400 is connected to the end of the second plate 230 located in the second mounting groove 161.

[0083] The moving contact 500 includes a connecting part and a contact part, and the connecting part of the moving contact 500 is connected to the operating mechanism 600. During the opening process of the circuit breaker, the contact part moves towards the top cover 150, and during the closing process of the circuit breaker, the contact part moves towards the base 160.

[0084] Based on this, when the first plate 220 is partially located within the first mounting groove 151 and the second plate 230 is partially located within the second mounting groove 161, when the contact portion moves toward the top cover 150, the contact portion pushes against the first plate 220, allowing the first plate 220 to move toward the top cover 150. At this time, the first elastic member 300 compresses and stores energy, and the second elastic member 400 releases energy, allowing the second plate 230 to also move toward the top cover 150. When the contact portion moves toward the base 160, the contact portion pushes against the second plate 230, allowing the second plate 230 to move toward the base 160. At this time, the second elastic member 400 compresses and stores energy, and the first elastic member 300 releases energy, allowing the first plate 220 to also move toward the base 160.

[0085] In summary, this application provides a first elastic element 300 within the first mounting groove 151, with one end of the first plate 220 located within the first mounting groove 151 connected to the first elastic element 300. A second elastic element 400 is provided within the second mounting groove 161, with one end of the second plate 230 located within the second mounting groove 161 connected to the second elastic element 400. Thus, during the circuit breaker's opening and closing process, under the elastic force of the first elastic element 300 and the second elastic element 400, the first plate 220 and the second plate 230 can move together with the moving contact 500. The first plate 220 and the second plate 230 can enclose the moving contact 500, thereby blocking high-temperature gas on both the side of the moving contact 500 facing the top cover 150 and the side facing the base 160. This reduces the probability of damage to the operating mechanism 600 caused by high-temperature gas and improves the reliability of the circuit breaker.

[0086] like Figure 1 as well as Figure 3 As shown, the first plate 220 and the second plate 230 are offset in the arrangement direction of the operating space 110 and the arc extinguishing space 120. The portion of the first plate 220 outside the first mounting groove 151 and the portion of the second plate 230 outside the second mounting groove 161 slide in contact, so that a labyrinth groove is formed between the first plate 220, the second plate 230 and the partition 130. The moving contact 500 contacts the groove wall of the clearance groove 210, and the moving contact 500 is always in contact with the first plate 220 and the second plate 230 during movement.

[0087] The first plate 220 and the second plate 230 can both be located within the operating space 110, or both can be located within the arc-extinguishing space 120. The first mounting slot 151 and the second mounting slot 161 can be staggered in the arrangement direction of the operating space 110 and the arc-extinguishing space 120. Thus, when the first plate 220 is installed in the first mounting slot 151 and the second plate 230 is installed in the second mounting slot 161, the first plate 220 and the second plate 230 can be staggered in the arrangement direction of the operating space 110 and the arc-extinguishing space 120.

[0088] The portion of the first plate 220 located outside the first mounting groove 151 and the portion of the second plate 230 located outside the second mounting groove 161 are always in sliding contact, so that the portion of the first plate 220 located outside the first mounting groove 151 and the portion of the second plate 230 located outside the second mounting groove 161 are arranged in a front-to-back configuration along the arrangement direction of the operating space 110 and the arc extinguishing space 120.

[0089] The partition 130 can be disposed on one side of the first plate 220 and the second plate 230, and the partition 130 can slide in contact with either the first plate 220 or the second plate 230. The arrangement of the partition 130 with the first plate 220 and the second plate 230 can be such that the first plate 220 is located between the partition 130 and the second plate 230, or the second plate 230 is located between the partition 130 and the first plate 220. The partition 130, the first plate 220, and the second plate 230 are in a triple-overlapping configuration, and the gaps between the partition 130, the first plate 220, and the second plate 230 can form a labyrinth groove.

[0090] In summary, the first plate 220 and the second plate 230 are misaligned, and the portion of the first plate 220 outside the first mounting groove 151 and the portion of the second plate 230 outside the second mounting groove 161 slide in contact. This allows the partition plate 130, the first plate 220, and the second plate 230 to form a triple overlap in the arrangement direction of the operating space 110 and the arc-extinguishing space 120. This increases the path of the labyrinth groove, further reduces the degree of high-temperature gas escape from the arc-extinguishing space 120 to the operating space 110, and reduces the impact of high-temperature gas on the operating mechanism 600, thereby improving the reliability of the circuit breaker.

[0091] like Figure 1 , Figure 4 as well as Figure 6 As shown, the top cover 150 is provided with a first mounting part 170, and a first mounting groove 151 is located in the first mounting part 170. The first mounting part 170 is provided with a guide slope on the side facing the base 160. When the first plate 220 moves with the moving contact 500 until it is completely located in the first mounting groove 151, the moving contact 500 is in contact with the guide slope.

[0092] The first mounting part 170 can be a protruding structure provided on the top cover 150 toward the base 160, the first mounting groove 151 can be a groove structure opened on the first mounting part 170 toward the base 160, and the guide slope can be a surface formed after chamfering on the first mounting part 170.

[0093] When the circuit breaker trips, the moving contact 500 moves toward the top cover 150 and drives the first plate 220 to move into the first mounting groove 151. When the moving contact 500 moves to a stationary state, it drives the first plate 220 to fully enter the first mounting groove 151. The moving contact 500 forms a certain angle with the top cover 150 and abuts against the guide slope.

[0094] With the above configuration, when the moving contact 500 drives the first plate 220 to move completely into the first mounting groove 151, the guide slope can be completely fitted with the moving contact 500. This reduces the gap between the moving contact 500 and the top cover 150, thereby reducing the probability of high-temperature gas escaping into the operating space 110 through the gap. This reduces the impact of high-temperature gas on the operating mechanism 600 and improves the reliability of the circuit breaker.

[0095] like Figure 1 , Figure 2 as well as Figure 5 As shown, the base 160 is provided with a second mounting part 180, and a second mounting groove 161 is located in the second mounting part 180. The second mounting part 180 is provided with a limiting surface on the side facing the top cover 150. When the second plate 230 moves with the moving contact 500 until it is completely located in the second mounting groove 161, the moving contact 500 is in contact with the limiting surface.

[0096] The second mounting part 180 can be a protruding structure provided in the direction of the base 160 toward the top cover 150, the second mounting groove 161 can be a groove structure provided in the direction of the second mounting part 180 toward the top cover 150, and the limiting surface can be the surface of the second mounting part 180 toward the direction of the top cover 150.

[0097] When the circuit breaker is closed, the moving contact 500 will move toward the base 160, and the moving contact 500 will drive the second plate 230 to move into the second mounting groove 161. When the moving contact 500 moves to a stationary state, the moving contact 500 will drive the second plate 230 to fully enter the second mounting groove 161, and the moving contact 500 will abut against the limiting surface.

[0098] With the above settings, when the moving contact 500 drives the second plate 230 to move completely into the second mounting groove 161, the moving contact 500 can be completely fitted with the limiting surface. This reduces the gap between the moving contact 500 and the base 160, thereby reducing the probability of high-temperature gas escaping into the operating space 110 through the gap. Furthermore, the limiting surface can provide support for the moving contact 500, reducing the probability of damage to the suspended part of the moving contact 500 due to lack of support, and lowering the maintenance cost of the circuit breaker in the later stages.

[0099] like Figure 2 , Figure 4 , Figure 7 as well as Figure 8 As shown, a first limiting post 152 is provided in the first mounting groove 151, and a second limiting post 162 is provided in the second mounting groove 161. A first limiting hole 221 is provided on the side of the first plate 220 facing the top cover 150, and the first limiting post 152 is located in the first limiting hole 221. A second limiting hole 231 is provided on the side of the second plate 230 facing the base 160, and the second limiting post 162 is located in the second limiting hole 231.

[0100] The first limiting post 152 can be a columnar structure disposed within the first mounting groove 151, and the first limiting post 152 can be disposed in the middle of the first mounting groove 151. The second limiting post 162 can be a columnar structure disposed within the second mounting groove 161, and the second limiting post 162 can be disposed in the middle of the second mounting groove 161.

[0101] The first limiting hole 221 can be a groove structure provided on the first plate 220 facing the top cover 150. The shape of the first limiting hole 221 can be the same as the shape of the first limiting post 152, so that when the first plate 220 is installed in the first mounting groove 151, the first limiting post 152 can be inserted into the first limiting hole 221. The second limiting hole 231 can be a groove structure provided on the second plate 230 facing the base 160. The shape of the second limiting hole 231 can be the same as the shape of the second limiting post 162, so that when the second plate 230 is installed in the second mounting groove 161, the second limiting post 162 can be inserted into the second limiting hole 231.

[0102] With the above configuration, the first limiting post 152, in conjunction with the first limiting hole 221, can limit the movement of the first plate 220, reducing the probability of the first plate 220 tilting during the movement of the moving contact 500. Similarly, the second limiting post 162, in conjunction with the second limiting hole 231, can limit the movement of the second plate 230, reducing the probability of the second plate 230 tilting during the movement of the moving contact 500. This improves the reliability of the anti-backflow plate 200.

Claims

1. An anti-backflow device, applied to a circuit breaker, the circuit breaker including a moving contact, characterized in that, The anti-backflow device includes: The housing has an internal cavity, which includes an operating space and an arc-extinguishing space. The operating space and the arc-extinguishing space are separated by a partition, and the partition has a through groove for the moving contact to move. An anti-backflow plate is provided to block the through groove, and the anti-backflow plate is provided with a clearance groove for the movement of the moving contact. A labyrinth groove is formed between the anti-backflow plate and the partition.

2. The anti-backflow device according to claim 1, characterized in that, The two opposite walls of the through groove are each provided with a first sliding groove; The anti-backflow plate is in contact with the wall of the first chute.

3. The anti-backflow device according to claim 1, characterized in that, The anti-backflow plate is provided with a second sliding groove on both sides; The wall of the through groove is in contact with the wall of the second sliding groove.

4. The anti-backflow device according to claim 1, characterized in that, The housing includes a top cover and a base, with the top cover covering the base; The anti-backflow plate includes a first plate and a second plate, and at least one of the first plate and the second plate is provided with the clearance groove; The top cover is provided with a first mounting groove, and the base is provided with a second mounting groove; The first plate portion is located within the first mounting slot, and the second plate portion is located within the second mounting slot.

5. The anti-backflow device according to claim 4, characterized in that, The first mounting groove is provided with a first elastic element, and the second mounting groove is provided with a second elastic element; The first plate is connected to the first elastic element at one end within the first mounting groove, and the second plate is connected to the second elastic element at one end within the second mounting groove.

6. The anti-backflow device according to claim 5, characterized in that, The first plate and the second plate are misaligned in the arrangement direction of the operating space and the arc extinguishing space; The portion of the first plate located outside the first mounting groove and the portion of the second plate located outside the second mounting groove slide in contact, so that a labyrinth groove is formed between the first plate, the second plate and the partition. The moving contact contacts the wall of the clearance groove.

7. The anti-backflow device according to claim 4, characterized in that, The top cover is provided with a first mounting portion, and the first mounting groove is located in the first mounting portion; The first mounting part has a guide slope on the side facing the base. When the first plate moves with the moving contact to be completely located in the first mounting groove, the moving contact is in contact with the guide slope.

8. The anti-backflow device according to claim 5, characterized in that, The base is provided with a second mounting part, and the second mounting groove is located in the second mounting part; The second mounting part has a limiting surface on the side facing the top cover. When the second plate moves with the moving contact to be completely located in the second mounting groove, the moving contact is in contact with the limiting surface.

9. The anti-backflow device according to claim 4, characterized in that, The first mounting slot is provided with a first limiting post, and the second mounting slot is provided with a second limiting post; The first plate has a first limiting hole on the side facing the top cover, and the first limiting post is located in the first limiting hole; The second plate has a second limiting hole on the side facing the base, and the second limiting post is located in the second limiting hole.

10. A circuit breaker, characterized in that, Includes a moving contact, an operating mechanism, an arc-extinguishing chamber, and an anti-backflow device as described in any one of claims 1 to 9; The operating mechanism is located within the operating space of the anti-backflow device, and the operating mechanism is connected to the moving contact. The arc-extinguishing chamber is located within the arc-extinguishing space of the anti-backflow device, and the arc-extinguishing chamber is connected to the outside of the anti-backflow device.

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