Arc blocking devices and circuit breakers

Abstract

This application provides an arc-blocking device and a circuit breaker, belonging to the field of electrical equipment technology. In this arc-blocking device, one end of an elastic element is connected to the circuit breaker housing, and the other end is connected to an arc-blocking element, which is located on the movement trajectory of the circuit breaker's moving contact. When the moving and stationary contacts of the circuit breaker are in contact, the arc-blocking element is located on the side of the moving contact facing away from the stationary contact. During the separation process of the moving and stationary contacts, the moving contact pushes against the first side of the arc-blocking element, causing the arc-blocking element to drive the elastic element to bend and deform in the first direction until the moving contact slips off from the first side. Then, under the elastic force of the elastic element, the arc-blocking element moves in the second direction to between the moving and stationary contacts, thereby forcibly cutting off the arc generated when the moving and stationary contacts separate. It has good breaking capacity and can effectively improve the arc-extinguishing capability of the circuit breaker. Furthermore, the arc-blocking device provided in this embodiment has a simple structure, is easy to assemble, operates reliably, and has a certain degree of universality.

Description

Technical Field

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

[0002] Circuit breakers are important switching devices in power systems, capable of closing, carrying, and interrupting current in circuits. When faults such as leakage, overload, or short circuit occur in the system, circuit breakers can disconnect the circuit by tripping to prevent the fault from escalating.

[0003] In existing DC circuit breakers, the electric arc generated when the moving and stationary contacts break continues to burn between them, making it difficult to extinguish in the arc-extinguishing chamber. This can lead to circuit breaker failure. Therefore, an arc-isolating device that can effectively cut off the electric arc is needed to quickly extinguish it. Summary of the Invention

[0004] In view of the above problems, this application provides an arc-blocking device and a circuit breaker, which can effectively cut off the arc generated when the moving and stationary contacts of a DC circuit breaker break, thereby improving the arc-extinguishing efficiency of the circuit breaker.

[0005] A first aspect of this application provides an arc-blocking device applied to a circuit breaker. The arc-blocking device includes an elastic element and an arc-blocking element. One end of the elastic element is connected to the circuit breaker housing, and the arc-blocking element is connected to the other end of the elastic element. The arc-blocking element is located on the movement trajectory of the moving contact of the circuit breaker. When the moving contact and the stationary contact of the circuit breaker are in contact, the arc-blocking element is located on the side of the moving contact facing away from the stationary contact. During the separation of the moving and stationary contacts, the moving contact pushes against a first side of the arc-blocking element, causing the arc-blocking element to bend and deform in a first direction, until the moving contact slips off from the first side. Then, under the elastic force of the elastic element, the arc-blocking element moves in a second direction between the moving contact and the stationary contact. The first direction is consistent with the direction in which the moving contact moves away from the stationary contact, and the second direction is opposite to the first direction.

[0006] Through the above scheme, the arc-blocking component can move from the side of the moving contact away from the stationary contact to between the moving and stationary contacts, and can forcibly cut off the arc generated when the moving and stationary contacts break apart. It has good arc-cutting capability and can effectively improve the arc-extinguishing capability of the circuit breaker. Furthermore, the arc-blocking device provided in this embodiment has a simple structure, is easy to assemble, operates reliably, and has a certain degree of universality.

[0007] In some embodiments, during the closing process of the moving contact and the stationary contact, the moving contact pushes against the second side of the arc-blocking member, causing the arc-blocking member to drive the elastic member to bend and deform in the second direction until the moving contact slides off from the second side. Then, under the elastic force of the elastic member, the arc-blocking member moves in the first direction to the side of the moving contact opposite to the stationary contact, and the second side is opposite to the first side.

[0008] With the above solution, the arc-blocking component can be moved out from between the moving contact and the stationary contact when the moving contact needs to close and the stationary contact needs to close. This reduces the impact of the arc-blocking component on the movement of the moving contact toward the stationary contact and does not hinder the reliable contact between the moving contact and the stationary contact.

[0009] In some embodiments, the moving contact includes a first contact side for contacting the stationary contact, the stationary contact includes a second contact side for contacting the moving contact, the arc-blocking member is a plate-like structure, and when the arc-blocking member is located between the moving contact and the stationary contact, the arc-blocking member is substantially perpendicular to the arrangement direction of the first contact side and the second contact side.

[0010] The above scheme allows the arc-isolating element to be basically perpendicular to the length direction of the arc between the moving contact and the stationary contact, making it easier to cut off the arc through the arc-isolating element and quickly extinguish the arc, thereby improving the arc-extinguishing capability of the circuit breaker.

[0011] In some embodiments, when the arc-blocking member is located between the moving contact and the stationary contact, the projections of the first contact side and the second contact side both fall within the projection range of the arc-blocking member along the arrangement direction.

[0012] The above scheme enables the arc-cutting component to have a larger arc-cutting area when cutting the arc, so as to cut the arc as completely as possible and effectively improve the efficiency of arc extinguishing.

[0013] In some embodiments, the arc-blocking element is a plastic part made of a gas-generating material.

[0014] Through the above scheme, the arc-blocking component can generate gas while cutting off the electric arc between the moving contact and the stationary contact. This gas has a certain cooling effect on the electric arc, which helps to improve the arc extinguishing efficiency.

[0015] In some embodiments, when the moving contact and the stationary contact are in contact, there is a preset gap between the arc-blocking member and the side of the moving contact facing away from the stationary contact.

[0016] The above solution ensures that the arc-isolating component does not contact the side of the moving contact facing away from the stationary contact. In this way, when the moving contact and the stationary contact are in contact, the moving contact will not exert a force on the arc-isolating component to cause it to displace. Since the arc-isolating component does not move, it will not exert a force on the elastic component to cause it to bend and deform. Therefore, it can reduce the possibility of the elastic component being in a deformed state and breaking, and improve the service life of the elastic component.

[0017] In some embodiments, the elastic element includes a first elastic arm and a second elastic arm. The ends of the first and second elastic arms facing the housing are both connected to the housing, and the ends of the first and second elastic arms facing away from the housing are both connected to the arc-blocking element. When the arc-blocking element is located between the moving contact and the stationary contact, the first and second elastic arms are arranged side-by-side along an arrangement direction perpendicular to the first and second contact sides.

[0018] The above-described solution increases the service life of the elastic element, thereby extending the service life of the arc-blocking device. Arranging the two elastic arms side-by-side along a direction perpendicular to the first and second contact sides facilitates bending deformation and reduces the possibility of mutual interference.

[0019] In some embodiments, the first elastic arm and the second elastic arm are both elastic plates, and the elastic plates have multiple bends.

[0020] The above scheme allows multiple bends to serve as stress relief points when the elastic plate bends, facilitating bending deformation of the elastic plate while reducing the possibility of breakage due to stress concentration during bending deformation of the elastic component.

[0021] A second aspect of the embodiments of this application provides a circuit breaker, including a housing and an arc-blocking device as described in the first aspect.

[0022] In some embodiments, the housing includes an arc-blocking plate with a mounting groove on the side facing the arc-blocking device. The arc-blocking device also includes a mounting platform located within and connected to the mounting groove, with the side of the mounting platform facing the elastic element connected to the elastic element.

[0023] With the above solution, the elastic element can be indirectly connected to the circuit breaker housing via the mounting platform to securely connect the arc-blocking device to the housing.

[0024] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of an arc-blocking device provided in an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the structure of a circuit breaker provided in an embodiment of this application.

[0028] Figure 3 An exploded view of a circuit breaker provided in an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Arc blocking device; 11. Elastic element; 111. First elastic arm; 112. Second elastic arm; 12. Arc blocking element; 121. First side; 122. Second side; 13. Mounting platform; 2. Housing; 21. Arc blocking plate; 211. Mounting groove; 3. Moving contact; 31. First contact side; 4. Stationary contact; 41. Second contact side; X, First direction; Y, Second direction. Detailed Implementation

[0031] 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.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0033] 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.

[0034] 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 the arc-isolating device and circuit breaker of this application. For example, in the description of this application, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, the descriptions of directions such as X and Y, which are used to explain the operation and construction of the components of the arc-isolating device and circuit breaker in this embodiment, are not absolute but relative. Although these directions are appropriate when the components of the arc-isolating device and circuit breaker are in the positions shown in the figure, they should be interpreted differently when these positions change.

[0036] 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.

[0037] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0038] 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, such as a fixed connection, for example, a connection fixed by fasteners, such as a connection fixed 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 based on the specific circumstances.

[0039] 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.

[0040] Circuit breakers include DC circuit breakers and AC circuit breakers. Both DC and AC circuit breakers include moving contacts and stationary contacts. The position of the stationary contact remains fixed. The moving contact can move towards the stationary contact to close the connection, and it can also move away from the stationary contact to open the connection. When the moving and stationary contacts open, an electric arc is generated. Because electric arcs are conductive, if they are not promptly transferred and extinguished, they will damage the moving and stationary contacts, reducing the performance of the circuit breaker and even causing it to fail and become unable to open or close properly.

[0041] For AC circuit breakers, the AC current allowed to pass through has a natural zero-crossing point in each cycle, at which the arc is easily extinguished. However, when an AC circuit breaker interrupts a large instantaneous AC current, the time required for the arc to extinguish is longer, causing the arc to remain between the moving and stationary contacts for a longer period, posing a risk of burning the moving and stationary contacts. For DC circuit breakers, the DC current allowed to pass through does not have a zero-crossing point, and additional arc-extinguishing devices are usually required to enhance their arc-extinguishing capability. For example, an arc-starting plate can be added to guide the arc to the arc-extinguishing chamber for extinguishing. However, when a DC circuit breaker interrupts a small amount of DC current, the arc does not easily jump to the arc-starting plate and be guided to the arc-extinguishing chamber, and will continue to burn between the moving and stationary contacts, also posing a risk of burning the moving and stationary contacts.

[0042] In view of this, embodiments of this application provide an arc-blocking device to forcibly cut off the electric arc between the moving contact and the stationary contact, thereby solving the aforementioned problem of arc extinguishing difficulty.

[0043] Figure 1 This is a schematic diagram of the structure of an arc-blocking device 1 provided in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of a circuit breaker provided in an embodiment of this application. The circuit breaker includes... Figure 1 The arc-blocking device 1 shown can be used with either an AC or DC circuit breaker. It can interrupt the arc generated when the circuit breaker interrupts a current of any magnitude, and is particularly suitable for DC circuit breakers interrupting small currents. Figure 1 and Figure 2 As shown, the arc-blocking device 1 includes an elastic element 11 and an arc-blocking element 12. One end of the elastic element 11 is connected to the housing 2 of the circuit breaker. The arc-blocking element 12 is connected to the other end of the elastic element 11, and the arc-blocking element 12 is located on the movement trajectory of the moving contact 3 of the circuit breaker.

[0044] The elastic element 11 is a structural component in the arc-blocking device 1 that can undergo bending deformation. For example, the elastic element 11 can be any structure with bending deformation capabilities, such as a spring or an elastic plate. The elastic element 11 includes a first end and a second end that are positioned opposite each other. The first end of the elastic element 11 can be directly fixedly connected to the housing 2, or it can be connected to the housing 2 through other intermediate structural components. This application embodiment does not limit this. After the first end of the elastic element 11 is connected to the housing 2, the position of the first end will remain fixed, and the first end is equivalent to the fixed end of the arc-blocking device 1. After the second end of the elastic element 11 is connected to the arc-blocking element 12, the arc-blocking element 12 will be displaced as the moving contact 3 of the circuit breaker moves. Therefore, the positions of the second end and the arc-blocking element 12 are not fixed, and the arc-blocking element 12 is equivalent to the free end of the arc-blocking device 1.

[0045] The arc-isolating element 12 is a structural component in the arc-isolating device 1 used to cut off the electric arc generated when the moving contact 3 and the stationary contact 4 are disconnected. The arc-isolating element 12 is located on the movement trajectory of the moving contact 3 of the circuit breaker, so that the moving contact 3 can contact the arc-isolating element 12 during the process of moving towards the stationary contact 4 to close the moving contact 3 and the process of moving away from the stationary contact 4 to disconnect the moving contact 3 and the stationary contact 4, thereby causing the arc-isolating element 12 to displace. In some embodiments, the arc-isolating element 12 can be a plastic part made of a gas-generating material. The gas-generating material can be nylon, polyoxymethylene resin, etc., and this application embodiment does not limit this. These gas-generating materials generate gases such as hydrogen under the action of a high-temperature electric arc, which can cool the electric arc and improve the arc-extinguishing efficiency.

[0046] In some embodiments, in order not to affect the normal closing of the moving contact 3 and the stationary contact 4, the arc-blocking member 12 is not located between the moving contact 3 and the stationary contact 4 when they are in contact. For example, the arc-blocking member 12 may be located on the side of the moving contact 3 facing away from the stationary contact 4. For the sake of simplicity, the side of the moving contact 3 facing away from the stationary contact 4 will be referred to as the outer side of the moving contact 3, and the side of the moving contact 3 facing the stationary contact 4 will be referred to as the inner side of the moving contact 3.

[0047] During the process of breaking the moving contact 3 and the stationary contact 4, the outer side of the moving contact 3 first contacts and pushes against the first part of the first side 121 of the arc-blocking member 12 (e.g., Figure 1 As shown, the arc-blocking member 12 causes the elastic member 11 to bend and deform in the first direction X, during which the elastic member 11 stores energy. As the moving contact 3 continues to move away from the stationary contact 4, the contact area between the moving contact 3 and the arc-blocking member 12 moves from the first part of the first side 121 to the second part of the first side 121, until the moving contact 3 slips off from the second part of the first side 121. Then, under the elastic force of the elastic member 11, the arc-blocking member 12 moves in the second direction Y to between the moving contact 3 and the stationary contact 4. The first part of the first side 121 is the part of the first side 121 closest to the elastic member 11, and the second part of the first side 121 is the part of the first side 121 furthest from the elastic member 11. Furthermore, the first direction X is the same as the direction in which the moving contact 3 moves away from the stationary contact 4, and the second direction Y is opposite to the first direction X.

[0048] When the positional relationship between the moving contact 3 and the stationary contact 4 is as follows: Figure 2 As shown, the aforementioned first direction X and the direction in which the moving contact 3 moves away from the stationary contact 4 can both be clockwise, and the aforementioned second direction Y can be counterclockwise.

[0049] In this embodiment, the arc-blocking member 12 can bend and deform the elastic member 11 in the first direction X under the push of the moving contact 3, so that the elastic member 11 stores energy. When the moving contact 3 slides off the arc-blocking member 12 in the first direction X, the elastic member 11 can drive the arc-blocking member 12 to move in the opposite direction Y, so that the arc-blocking member 12 moves between the moving contact 3 and the stationary contact 4. During the process of the arc-blocking member 12 moving between the moving contact 3 and the stationary contact 4, it can forcibly cut off the arc generated when the moving contact 3 and the stationary contact 4 break, and its arc-cutting ability is good, which can effectively improve the arc-extinguishing ability of the circuit breaker. Furthermore, the arc-blocking device 1 provided in this embodiment has a simple structure, is easy to assemble, operates reliably, and has a certain degree of universality.

[0050] After the arc-blocking member 12 cuts off the arc, during the closing process of the moving contact 3 and the stationary contact 4, the inner side of the moving contact 3 pushes against the first part of the second side 122 of the arc-blocking member 12, causing the arc-blocking member 12 to drive the elastic member 11 to bend and deform in the second direction Y. During this process, the elastic member 11 stores energy. As the moving contact 3 continues to move towards the stationary contact 4, the contact part between the moving contact 3 and the arc-blocking member 12 moves from the first part of the second side 122 to the second part of the second side 122, until the moving contact 3 slips off from the second part of the second side 122. Then, under the elastic force of the elastic member 11, the arc-blocking member 12 moves in the first direction X to the side of the moving contact 3 facing away from the stationary contact 4. The first part of the second side 122 is the part of the second side 122 that is close to the elastic member 11, and the second part of the second side 122 is the part of the second side 122 that is far away from the elastic member 11. The second side 122 of the arc-blocking member 12 is opposite to the first side 121 of the arc-blocking member 12.

[0051] Figure 3 An exploded view of a circuit breaker provided in an embodiment of this application; in some embodiments, such as... Figure 3 As shown, the moving contact 3 includes a first contact side 31 for contacting the stationary contact 4, and the stationary contact 4 includes a second contact side 41 for contacting the moving contact 3. The arc-blocking member 12 can be a plate-shaped structure. When the arc-blocking member 12 is located between the moving contact 3 and the stationary contact 4, the arc-blocking member 12 is substantially perpendicular to the arrangement direction of the first contact side 31 and the second contact side 41.

[0052] The stationary contact 4 is typically provided with a stationary silver point. The side of the stationary silver point facing the moving contact 3 is a plane. Due to the limited internal space of the circuit breaker, the range of movement of the moving contact 3 relative to the stationary contact 4 is limited. Therefore, the arrangement direction of the first contact side 31 and the second contact side 41 can be substantially perpendicular to the plane facing the moving contact 3, and the length direction of the arc between the moving contact 3 and the stationary contact 4 can also be substantially perpendicular to this plane. "Substantially perpendicular" means that the included angle between them is approximately 90 degrees. For example, the included angle could be 85 degrees, 88 degrees, 90 degrees, 93 degrees, etc., and this embodiment does not limit this. Furthermore, any reference to "substantially perpendicular" in the following text can be understood by referring to the explanation of "substantially perpendicular" here, and will not be repeated below.

[0053] The arc-blocking member 12 is basically perpendicular to the arrangement direction of the first contact side 31 and the second contact side 41, which means that the two large plates of the arc-blocking member 12 are basically perpendicular to this arrangement direction.

[0054] In this embodiment, the arc-blocking member 12 is configured as a plate-like structure. When the arc-blocking member 12 is located between the moving contact 3 and the stationary contact 4, the arc-blocking member 12 is basically perpendicular to the arrangement direction of the first contact side 31 and the second contact side 41. In this way, the arc-blocking member 12 can be basically perpendicular to the length direction of the arc between the moving contact 3 and the stationary contact 4, which makes it easier to cut off the arc through the arc-blocking member 12, so as to quickly extinguish the arc and improve the arc-extinguishing capability of the circuit breaker.

[0055] In some embodiments, when the arc-blocking member 12 is located between the moving contact 3 and the stationary contact 4, the projection of the first contact side 31 and the projection of the second contact side 41 both fall within the projection range of the arc-blocking member 12 along the arrangement direction.

[0056] The arc between the moving contact 3 and the stationary contact 4 is cut along a direction substantially perpendicular to the arrangement direction of the first contact side 31 and the second contact side 41. This arc has a certain cross-sectional area, and the size of this cross-sectional area is substantially equal to the area of ​​the first contact side 31 or the second contact side 41. The arc-blocking member 12 is cut in the same way. Assuming that the cross-sectional area of ​​the arc-blocking member 12 is smaller than the cross-sectional area of ​​the arc, the arc-blocking member 12 can only cut off part of the arc and cannot cut off the entire arc. The part of the arc that is not cut off may reignite, and there is a possibility that the arc cannot be extinguished.

[0057] In view of this, the dimensions of the arc-blocking component 12 are limited in this embodiment. Through the solution of this embodiment, the arc-blocking component 12 can have a large arc-cutting area when cutting the arc, so as to cut the arc as completely as possible and effectively improve the efficiency of arc extinguishing.

[0058] It is worth noting that since the arc breaker 12 is too large, it may interfere with adjacent structural components. Therefore, when designing the arc breaker 12, it is necessary to take into account the distance between the arc breaker 12 and other structural components so that the arc breaker 12 does not come into contact with the circuit breaker housing 2, stationary contacts and other structural components when it moves, so as to reduce the possibility that the arc breaker 12 may get stuck with other structural components and fail to reset smoothly.

[0059] In some embodiments, when the moving contact 3 and the stationary contact 4 are in contact, there is a preset gap between the arc-blocking member 12 and the side of the moving contact 3 facing away from the stationary contact 4.

[0060] The preset gap can be a small value such as 0.2 mm or 0.3 mm.

[0061] By employing the above-mentioned scheme, the arc-isolating element 12 does not contact the side of the moving contact 3 facing away from the stationary contact 4. Thus, when the moving contact 3 and the stationary contact 4 are in contact, the moving contact 3 will not exert a force on the arc-isolating element 12, causing the arc-isolating element 12 to shift. Since the arc-isolating element 12 does not move, it will not exert a force on the elastic element 11, causing the elastic element 11 to bend and deform. Therefore, the possibility of the elastic element 11 breaking due to being constantly in a deformed state can be reduced, thereby improving the service life of the elastic element 11.

[0062] Regarding the structure of the elastic element 11, in some embodiments, the elastic element 11 can be a spring. Since plastic springs are less susceptible to the effects of high-temperature metal particles compared to metal springs, the elastic element 11 can be a spring made of plastic. When the elastic element 11 is a spring, both ends of the elastic element 11 have hooks, and the housing 2 and the arc-blocking member 12 can both be provided with connection holes at the positions for connecting the elastic element 11. The hooks at both ends of the elastic element 11 can pass through these connection holes and connect to the housing 2 and the arc-blocking member 12 respectively. It is understood that the elastic element 11 can also be made of other structural components such as an elastic plate that can meet the requirements for bending deformation, and the number of elastic elements 11 can be one or more; this application does not limit this.

[0063] For example, such as Figure 1 As shown, the elastic element 11 may include a first elastic arm 111 and a second elastic arm 112. The end of the first elastic arm 111 facing the housing 2 and the end of the second elastic arm 112 facing the housing 2 are both connected to the housing 2. The end of the first elastic arm 111 facing away from the housing 2 and the end of the second elastic arm 112 facing away from the housing 2 are both connected to the arc blocking element 12. The arrangement direction of the first elastic arm 111 and the second elastic arm 112 is basically perpendicular to the length direction of the electric arc.

[0064] The first elastic arm 111 and the second elastic arm 112 can be the aforementioned plastic spring or elastic plate, etc. The connection method between them and the housing 2 and the arc-blocking member 12 can also refer to the previous description, and will not be repeated here.

[0065] The elastic element 11 includes two elastic arms, which can increase the service life of the elastic element 11, thereby extending the service life of the arc blocking device 1. Arranging the two elastic arms side by side along an arrangement direction perpendicular to the first contact side 31 and the second contact side 41 facilitates the bending and deformation of the two elastic arms and reduces the possibility of mutual interference.

[0066] Furthermore, when both the first elastic arm 111 and the second elastic arm 112 are elastic plates, the elastic plate can have multiple bends. Multiple bends can serve as stress relief points when the elastic plate bends, which facilitates the bending deformation of the elastic plate and reduces the possibility of fracture damage due to stress concentration when the elastic element 11 bends.

[0067] Figure 2 This is a schematic diagram of the structure of a circuit breaker provided in an embodiment of this application, as shown below. Figure 2 As shown in the figure, this application also provides a circuit breaker, which includes a housing 2 and an arc-blocking device 1 as described in the previous embodiments. Since the structure and beneficial effects of the arc-blocking device 1 have been described in detail in the previous embodiments, they will not be repeated here.

[0068] The previous embodiment of arc-blocking device 1 described that one end of the elastic element 11 in arc-blocking device 1 is connected to the housing 2 of the circuit breaker, and the elastic element 11 can be directly connected to the housing 2. It is understood that the elastic element 11 can also be indirectly connected to the housing 2 through other intermediate structural components. For example, such as... Figure 2 and Figure 3 As shown, the housing 2 includes an arc-blocking plate 21, and the side of the arc-blocking plate 21 facing the arc-blocking device 1 may be provided with a mounting groove 211, such as... Figure 1 As shown, the arc-blocking device 1 may also include a mounting platform 13, which may be one of the aforementioned intermediate structural components. The mounting platform 13 is located in and connected to the mounting groove 211, and the side of the mounting platform 13 facing the elastic member 11 is connected to the elastic member 11.

[0069] The mounting platform 13, the elastic element 11, and the arc-blocking element 12 can be integrally formed. The mounting platform 13 and the mounting groove 211 can be connected by an interference fit to secure one end of the arc-blocking device 1 to the housing 2. It is understood that the mounting platform 13 can also be a protrusion structure of the arc-blocking plate 21 facing the elastic element 11, and this embodiment of the application does not limit this.

[0070] The circuit breaker provided in this embodiment can forcibly cut off the arc generated when the moving contact 3 and the stationary contact 4 are broken by the arc-blocking element 12 in the arc-blocking device 1. It has good breaking capacity and can effectively improve the arc-extinguishing capability of the circuit breaker. Furthermore, the arc-blocking device 1 provided in this embodiment has a simple structure, is easy to assemble, operates reliably, and has a certain degree of universality.

[0071] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An arc-blocking device, applied to a circuit breaker, characterized in that, The arc-blocking device includes: An elastic element, one end of which is connected to the housing of the circuit breaker; An arc-blocking element is connected to the other end of the elastic element, and the arc-blocking element is located on the movement trajectory of the moving contact of the circuit breaker. When the moving contact and stationary contact of the circuit breaker are in contact, the arc-blocking member is located on the side of the moving contact facing away from the stationary contact. During the separation process of the moving contact and the stationary contact, the moving contact pushes against the first side of the arc-blocking member, causing the arc-blocking member to drive the elastic member to bend and deform in the first direction until the moving contact slips off from the first side. Then, under the elastic force of the elastic member, the arc-blocking member moves in the second direction to the space between the moving contact and the stationary contact. The first direction is consistent with the direction in which the moving contact moves away from the stationary contact, and the second direction is opposite to the first direction.

2. The arc-blocking device according to claim 1, characterized in that, During the closing process of the moving contact and the stationary contact, the moving contact pushes against the second side of the arc-blocking member, causing the arc-blocking member to drive the elastic member to bend and deform in the second direction until the moving contact slides off the second side. Then, under the elastic force of the elastic member, the arc-blocking member moves in the first direction to the side of the moving contact opposite to the stationary contact, and the second side is opposite to the first side.

3. The arc-blocking device according to claim 1, characterized in that, The moving contact includes a first contact side for contacting the stationary contact, and the stationary contact includes a second contact side for contacting the moving contact. The arc-blocking member has a plate-like structure. When the arc-blocking member is located between the moving contact and the stationary contact, the arc-blocking member is perpendicular to the arrangement direction of the first contact side and the second contact side.

4. The arc-blocking device according to claim 3, characterized in that, When the arc-blocking member is located between the moving contact and the stationary contact, along the arrangement direction, the projections of the first contact side and the second contact side both fall within the projection range of the arc-blocking member.

5. The arc-blocking device according to any one of claims 1 to 4, characterized in that, The arc-blocking component is a plastic part made of gas-generating material.

6. The arc-blocking device according to any one of claims 1 to 4, characterized in that, When the moving contact and the stationary contact are in contact, there is a preset gap between the arc-blocking member and the side of the moving contact facing away from the stationary contact.

7. The arc-blocking device according to claim 3, characterized in that, The elastic element includes a first elastic arm and a second elastic arm. The end of the first elastic arm facing the housing and the end of the second elastic arm facing the housing are both connected to the housing. The end of the first elastic arm facing away from the housing and the end of the second elastic arm facing away from the housing are both connected to the arc-blocking element. When the arc-blocking member is located between the moving contact and the stationary contact, the first elastic arm and the second elastic arm are arranged side by side along an arrangement direction perpendicular to the first contact side and the second contact side.

8. The arc-blocking device according to claim 7, characterized in that, Both the first elastic arm and the second elastic arm are elastic plates, and the elastic plates have multiple bends.

9. A circuit breaker, characterized in that, It includes a housing and an arc-blocking device as described in any one of claims 1 to 8.

10. The circuit breaker according to claim 9, characterized in that, The housing includes an arc-blocking plate, and the arc-blocking plate has a mounting groove on the side facing the arc-blocking device; The arc-blocking device further includes a mounting platform, which is located in and connected to the mounting groove, and the side of the mounting platform facing the elastic member is connected to the elastic member.

Images