An arc extinguishing system and circuit breaker

Abstract

This application provides an arc-extinguishing system and a circuit breaker, belonging to the field of electrical equipment technology. The arc-extinguishing system provided in this application includes a stationary contact, an arc-extinguishing chamber, and a stationary cover. The stationary contact includes a fixed part and a contact part connected to each other. The fixed part is connected to the base of the circuit breaker, and the contact part has a guide groove that extends through the contact part. The arc-extinguishing chamber is disposed on the contact part. The stationary cover is disposed on the portion of the contact part that does not contact the arc-extinguishing chamber. A hook and a limiting block are provided on the side of the stationary cover facing the contact part. The hook passes through the guide groove and hooks to the side of the contact part facing away from the stationary cover. The limiting block is located within the guide groove and contacts the groove wall. The stationary cover mentioned in this application can limit the position of the stationary cover in the thickness, length, and width directions of the stationary contact, reducing the probability of changes in the relative position between the stationary cover and the stationary contact. This improves the shielding efficiency of the stationary cover on the contact part, thereby increasing the reliability of the arc-extinguishing system.

Description

Technical Field

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

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

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

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

[0005] In a first aspect, this application provides an arc-extinguishing system using a circuit breaker, the circuit breaker including a base. The arc-extinguishing system includes a stationary contact, an arc-extinguishing chamber, and a stationary cover. The stationary contact includes a fixed portion and a contact portion connected to each other. The fixed portion is connected to the base, and the contact portion has a flow guide groove that extends through the contact portion. The arc-extinguishing chamber is disposed on the contact portion. The stationary cover is disposed on the portion of the contact portion that does not contact the arc-extinguishing chamber. A hook and a limiting block are provided on the side of the stationary cover facing the contact portion. The hook passes through the flow guide groove and hooks to the side of the contact portion facing away from the stationary cover. The limiting block is located within the flow guide groove and contacts the groove wall.

[0006] The above solution involves installing a hook on the side of the stationary cover facing the contact portion. This hook passes through the guide groove and hooks to the side of the contact portion facing away from the stationary cover, thus limiting the stationary cover's position in the thickness direction of the contact portion. A limiting block is also installed on the side of the stationary cover facing the contact portion, abutting against the wall of the guide groove, thereby limiting the stationary cover's position in the width and length directions of the stationary contact. Limiting the stationary cover in the thickness, length, and width directions of the stationary contact improves its installation stability and reduces the probability of changes in the relative position between the stationary cover and the stationary contact. This improves the stationary cover's shielding efficiency against the contact portion, reduces the probability of arc transfer to the contact portion during circuit breaker breaking, and thus reduces the arc's residence time on the stationary contact. This improves the arc-extinguishing effect of the arc-extinguishing system and enhances its reliability.

[0007] In one possible design, the side of the stationary cover facing the contact portion has a raised rib. The raised rib contacts the side wall of the stationary cover facing the contact portion.

[0008] By employing the above-described method, the ribs can reduce the contact area between the stationary cover and the contact parts. During the circuit breaker's breaking process, a large amount of heat is generated on the contact parts. Since the stationary cover is made of insulating material, reducing the contact area between the stationary cover and the contact parts reduces the heat-exposed area of ​​the stationary cover. When the heat-exposed area of ​​the stationary cover is reduced, the possibility of deformation after heating is reduced. This improves the shielding effect of the stationary cover on the contact parts, reduces the probability of arc transfer to the contact parts during circuit breaker breaking, and thus improves the reliability of the arc extinguishing system.

[0009] In one possible design, the arc-extinguishing system also includes a moving contact rod. The moving contact rod has a groove with the groove opening facing the contact portion.

[0010] By creating a groove on the moving contact rod with the groove opening facing the contact portion, the distance between the moving contact rod and the contact portion can be increased. This ensures that during circuit breaker breaking, the distance between the moving contact and the stationary contact is always less than the distance between the moving contact rod and the contact portion. This reduces the probability of the arc transferring from between the moving and stationary contacts to between the moving contact rod and the contact portion. Consequently, it reduces the residence time of the arc between the moving and stationary contacts, improving the reliability of the arc extinguishing system.

[0011] In one possible design, the moving contact rod is also provided with a reinforcing rib, which is positioned close to the groove.

[0012] By implementing the above solution, the addition of reinforcing ribs can improve the strength of the moving contact rod, reduce the probability of breakage due to reduced strength during use, improve the reliability of the moving contact rod, and thus improve the reliability of the arc extinguishing system.

[0013] In one possible design, the arc-extinguishing chamber includes an arc-extinguishing grid assembly and an arc-isolating shield. The arc-isolating shield covers a portion of the arc-extinguishing grid assembly.

[0014] Through the above-described solution, this application installs an arc-isolating cover within the arc-extinguishing chamber. This cover protects part of the arc-extinguishing grid assembly, thereby extending its service life. Consequently, the service life of the arc-extinguishing system can be improved.

[0015] In one possible design, the arc-blocking shield is provided with an exhaust channel. The exhaust channel is located on the side of the arc-blocking shield away from the moving contact.

[0016] The above-mentioned solution improves the exhaust efficiency of the arc-extinguishing chamber by setting up the exhaust trough, and reduces the residence time of the high-temperature gas generated during the circuit breaker's breaking process in the arc-extinguishing chamber. This reduces the probability of damage to the arc-extinguishing chamber due to the inability to remove the high-temperature gas in time, thereby improving the reliability of the arc-extinguishing chamber and the overall reliability of the arc-extinguishing system.

[0017] In one possible design, the arc-extinguishing grid assembly includes multiple arc-extinguishing grids spaced apart. The arc-blocking cover has a first limiting protrusion inserted into the gap between two adjacent arc-extinguishing grids.

[0018] The above solution involves setting a first limiting protrusion on the arc-extinguishing shield and inserting it into the intervals between multiple arc-extinguishing grid plates. The arc-extinguishing grid plates can then limit the first limiting protrusion, thereby limiting the arc-extinguishing shield. This reduces the probability of the arc-extinguishing shield falling out of the arc-extinguishing chamber, thus improving the reliability of the arc-extinguishing system.

[0019] In one possible design, the stationary contact also includes a contact seat, and the arc-extinguishing grid has an arc-inducing plate. The contact seat is disposed on the contact portion and faces the moving contact. The arc-inducing plate is bent toward the contact seat.

[0020] With the above scheme, when the circuit breaker breaks and generates an arc, the arc will be generated between the moving contact and the stationary contact. At this time, the arc-inducing plate on the arc-extinguishing grid can attract the arc towards the arc-extinguishing grid. When the arc-inducing plate is bent towards the contact seat, the end of the arc-inducing plate will be closer to the stationary contact, which can improve the efficiency of the arc-inducing plate in attracting the arc.

[0021] In one possible design, the contact seat extends toward the fixing part. The contact seat has a stationary contact, which is located on the side of the contact seat away from the fixing part.

[0022] With the above design, the contact base extends towards the fixed part, and the stationary contact is located on the side of the contact base away from the fixed part. During the circuit breaker's breaking process, the arc can be transferred from the stationary contact to the part of the contact base extending towards the fixed part. This reduces the time the arc erodes the stationary contact. When the arc erosion time is reduced, the wear on the stationary contact is reduced, eliminating the need for frequent replacements and thus lowering the operating cost of the stationary contact. This, in turn, reduces the operating cost of the arc extinguishing system.

[0023] Secondly, this application provides a circuit breaker including a base and the arc-extinguishing system mentioned in the first aspect. The arc-extinguishing system is located within the base. The arc-isolating chamber has a second limiting protrusion. The base has a limiting groove, and the second limiting protrusion is located within the limiting groove.

[0024] 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

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

[0026] Figure 2 This is a schematic diagram of the structure of the base provided in an embodiment of this application.

[0027] Figure 3 Assembly diagram of the stationary contact, arc-extinguishing chamber, and stationary cover provided in the embodiments of this application.

[0028] Figure 4 This is a schematic diagram of the structure of the stationary contact provided in an embodiment of this application.

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

[0030] Figure 6 This is a schematic diagram of the static cover provided in an embodiment of this application from another perspective.

[0031] Figure 7 This is a schematic diagram showing the contact between the stationary contact and the moving contact in an embodiment of this application.

[0032] Figure 8 This is a schematic diagram of the structure of the moving contact provided in an embodiment of this application.

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

[0034] Figure 10 This is a schematic diagram of the arc-extinguishing shield provided in an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Stationary contact; 110. Fixing part; 120. Contact part; 121. Contact seat; 122. Flow guide groove; 130. Stationary contact point;

[0037] 200. Arc-extinguishing chamber; 210. Arc-extinguishing grid plate; 211. Arc-starting plate; 220. Arc-isolating cover; 221. Exhaust groove; 222. First limiting protrusion; 223. Second limiting protrusion;

[0038] 300. Static cover; 310. Hook; 320. Limiting block; 330. Raised rib;

[0039] 400, Moving contact rod; 410, First end; 420, Second end; 430, Moving contact point; 440, Groove; 450, Reinforcing rib;

[0040] 500. Base; 510. Arc baffle; 511. Limiting groove;

[0041] 600, middle cover. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0044] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and drawings of this application are intended to cover without excluding other meanings. The words "a" or "an" do not exclude the presence of multiples.

[0045] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0047] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by fasteners, such as a connection secured by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0051] Figure 1 This is a schematic diagram of the overall structure of the circuit breaker provided in the embodiments of this application. Figure 2 This is a schematic diagram of the structure of the base provided in an embodiment of this application. Figure 3 Assembly drawings of the stationary contact, arc-extinguishing chamber, and stationary cover provided in embodiments of this application. Figures 1 to 3 As shown, this application provides a circuit breaker, which includes a base 500 and an arc-extinguishing system. The arc-extinguishing system is located within the base 500. The arc-isolating cover 220 of the arc-extinguishing chamber 200 is provided with a second limiting protrusion 223. The base 500 is provided with a limiting groove 510, and the second limiting protrusion 223 is located within the limiting groove 510.

[0052] The circuit breaker includes a housing, which comprises a middle cover 600 and a base 500, the base 500 having internal installation space. The circuit breaker can be multi-phase, each phase can have its own independent space, and each phase can be equipped with an arc-extinguishing system. The base 500 also contains an arc-blocking plate 510, which divides the space for each phase in two. The arc-extinguishing system is located in the space on one side of the arc-blocking plate 510, while the other components within the circuit breaker can be located in the space on the other side. In this way, the arc-blocking plate 510 can block the arc generated within the arc-extinguishing system, protecting the other components within the circuit breaker. The middle cover 600 can be placed on the base 500 to protect the arc-extinguishing system within the base 500.

[0053] The arc-extinguishing system includes an arc-extinguishing chamber 200, which is equipped with an arc-isolating cover 220. The arc-isolating cover 220 has a second limiting protrusion 223 on the side facing the arc-isolating plate 510, and the arc-isolating plate 510 has a limiting groove 511 on the side facing the arc-isolating cover 220. When the arc-extinguishing system is installed in the base 500, the second limiting protrusion 223 is located within the limiting groove 511, at which point the arc-isolating plate 510 can limit the arc-isolating cover 220. With the arc-isolating plate 510 positioned on the base 500 and the arc-isolating cover 220 positioned on the arc-extinguishing chamber 200, the base 500 can also limit the arc-extinguishing chamber 200. This reduces the possibility of the arc-extinguishing chamber 200 shaking within the base 500, increasing the reliability of the arc-extinguishing chamber 200 and thus increasing the reliability of the circuit breaker.

[0054] The arc extinguishing system mentioned in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0055] Figure 4 This is a schematic diagram of the structure of the stationary contact provided in an embodiment of this application. Figures 2 to 4 As shown, the arc-extinguishing system mentioned in this application includes a stationary contact 100, an arc-extinguishing chamber 200, and a stationary cover 300. The stationary contact 100 includes a fixing part 110 and a contact part 120 connected to each other. The fixing part 110 is connected to the base 500, and the contact part 120 is provided with a guide groove 122 that penetrates through the contact part 120. The arc-extinguishing chamber 200 is disposed on the contact part 120.

[0056] The stationary contact 100 can be made of a highly conductive material such as copper or silver. The stationary contact 100 comprises two interconnected parts. One part is a fixing part 110, which secures the stationary contact 100 within the base 500. The other part is a contact part 120, on which a contact seat 121 can be provided, and on which a stationary contact 130 can be provided.

[0057] The guide groove 122 can be a groove structure provided on the contact portion 120, and the guide groove 122 can penetrate the contact portion 120 along its thickness direction. The guide groove 122 can be a U-shaped groove, and when the guide groove 122 is provided on the contact portion 120, it can be arranged around the stationary contact 130. In this way, when the current flows through the contact portion 120, it cannot flow in a straight line, but will detour around the guide groove 122 before reaching the stationary contact 130, thereby achieving current diversion in the contact portion 120, so as to provide an electro-repulsive force through current reversal. When the electro-repulsive force in the arc-extinguishing system increases, the breaking effect of the circuit breaker will be improved, thereby increasing the reliability of the arc-extinguishing system.

[0058] The arc-extinguishing chamber 200 may include an arc-extinguishing grid assembly and two side plates. The two side plates may be symmetrically arranged, and there may be a gap between the two side plates. The arc-extinguishing grid assembly may be disposed within the gap between the two side plates. When the arc-extinguishing chamber 200 is disposed on the contact portion 120, the side of the two side plates facing the contact portion 120 may come into contact with the contact portion 120.

[0059] Figure 5 This is a schematic diagram of the static shield provided in an embodiment of this application from a certain perspective. Figure 6 This is a schematic diagram of the static shield provided in an embodiment of this application from another perspective. (See diagram below.) Figures 3 to 6 As shown, the static cover 300 is installed on the part of the contact portion 120 that does not contact the arc-extinguishing chamber 200. The static cover 300 is provided with a hook 310 and a limiting block 320 on the side facing the contact portion 120. The hook 310 passes through the guide groove 122 and hooks with the side of the contact portion 120 facing away from the static cover 300. The limiting block 320 is located in the guide groove 122 and contacts the groove wall of the guide groove 122.

[0060] The stationary cover 300 can be made of insulating material. The stationary cover 300 can cover the remaining portion of the contact portion 120 except for the contact seat 121. By providing the stationary cover 300, insulation protection can be provided to the remaining portion of the contact portion 120 except for the contact seat 121. Thus, during the circuit breaker's breaking process, the arc will not transfer from the contact seat 121 to other parts of the contact portion 120, thereby improving the arc-extinguishing effect of the arc-extinguishing system and enhancing its reliability.

[0061] When the stationary cover 300 is installed on the contact portion 120, the stationary cover 300 is located between the two side plates of the arc-extinguishing chamber 200. Compared with the prior art where the arc-extinguishing chamber 200 is placed on the stationary cover 300, the stationary cover 300 being located between the two side plates of the arc-extinguishing chamber 200 can reduce the volume of the stationary cover 300, thereby achieving the effect of saving costs.

[0062] The hook 310 has a hook-shaped structure and can be made of the same material as the stationary cover 300. The hook 310 includes a hook shank and a hook bend. The hook shank can be located within the guide groove 122, and the hook bend can hook onto the side wall of the contact portion 120 away from the arc-extinguishing chamber 200. There can be one or more hooks 310. When there are multiple hooks 310, they can be arranged substantially symmetrically on the stationary cover 300.

[0063] The limiting block 320 can be a protruding structure provided on the side of the stationary cover 300 facing the contact portion 120, or the limiting block 320 can be U-shaped. When the hook bend of the hook 310 hooks with the side wall of the contact portion 120 away from the arc-extinguishing chamber 200, the limiting block 320 can be located in the guide groove 122 and can contact the groove wall of the guide groove 122.

[0064] In summary, by providing a hook 310 on the side of the stationary cover 300 facing the contact portion 120, and by using the hook 310 to pass through the guide groove 122 and hook onto the side of the contact portion 120 opposite to the stationary cover 300, the stationary cover 300 can be limited in the thickness direction of the contact portion 120. By providing a limiting block 320 on the side of the stationary cover 300 facing the contact portion 120, and by having the limiting block 320 abut against the wall of the guide groove 122, the stationary cover 300 can be limited in the width and length directions of the stationary contact 100. Limiting the stationary cover 300 in the thickness, length, and width directions of the stationary contact 100 improves the installation stability of the stationary cover 300 and reduces the probability of changes in the relative position between the stationary cover 300 and the stationary contact 100. The shielding efficiency of the stationary cover 300 on the contact part 120 is improved, reducing the probability of the arc transferring to the contact part 120 during the circuit breaker's breaking process. This reduces the time the arc stays on the stationary contact 100, thereby improving the arc extinguishing effect of the arc extinguishing system and thus improving the reliability of the arc extinguishing system.

[0065] Please continue to refer to Figure 6 As shown, the stationary cover 300 has a raised rib 330 on the side facing the contact portion 120. The raised rib 330 is in contact with the side wall of the contact portion 120 facing the stationary cover 300.

[0066] The rib 330 can be a raised structure provided on the side of the stationary cover 300 facing the contact portion 120. The rib 330 can be integrally formed with the stationary cover 300, or the rib 330 can be provided on the stationary cover 300 by snap-fit ​​or adhesive method after the stationary cover 300 is formed.

[0067] The number of raised ribs 330 can be one or more. When there are multiple raised ribs 330, the multiple raised ribs 330 can be arranged in parallel on the static cover 300, or the multiple raised ribs 330 can be arranged in an alternating or irregular manner on the static cover 300.

[0068] When the static cover 300 is placed on the contact portion 120, the protruding rib 330 contacts the side wall of the contact portion 120 facing the static cover 300. At this time, the part of the side wall of the static cover 300 facing the contact portion 120 without the protruding rib 330 can form a gap with the side wall of the contact portion 120 facing the static cover 300.

[0069] In summary, the rib 330 reduces the contact area between the stationary cover 300 and the contact portion 120. During the circuit breaker's breaking process, a large amount of heat is generated on the contact portion 120. Since the stationary cover 300 is made of insulating material, reducing the contact area between the stationary cover 300 and the contact portion 120 reduces the heat-exposed area of ​​the stationary cover 300. When the heat-exposed area of ​​the stationary cover 300 is reduced, the possibility of deformation after heating is reduced. This improves the shielding effect of the stationary cover 300 on the contact portion 120, reducing the probability of arc transfer to the contact portion 120 during circuit breaker breaking, thereby improving the reliability of the arc-extinguishing system.

[0070] Figure 7 This is a schematic diagram illustrating the contact between the stationary contact and the moving contact as provided in an embodiment of this application. Figure 4 as well as Figure 7 As shown, the arc extinguishing system also includes a moving contact rod 400. When the moving contact 430 is in contact with the stationary contact 130, the moving contact rod 400 is relatively close to the contact portion 120. When the moving contact 430 separates from the stationary contact 130, the shortest distance between the moving contact rod 400 and the contact portion 120 may be less than the minimum distance between the moving contact 430 and the stationary contact 130. Due to the characteristics of an electric arc, the arc may transfer between two closer conductors, which could cause the arc to transfer from between the moving contact 430 and the stationary contact 130 to between the moving contact rod 400 and the contact portion 120.

[0071] To reduce the likelihood of the aforementioned problems, this application improves the moving contact. The moving contact mentioned in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0072] Figure 8 This is a schematic diagram of the structure of the moving contact provided in an embodiment of this application. Figure 2 , Figure 4 as well as Figure 8 As shown, the movable contact rod 400 is provided with a groove 440, and the groove opening of the groove 440 faces the contact part 120.

[0073] The moving contact rod 400 is located on one side of the stationary contact 100. The moving contact rod 400 includes a first end 410 and a second end 420 positioned opposite each other. The first end 410 has a moving contact 430 on its side facing the stationary contact 100. A contact support is provided within the circuit breaker base 500, and the contact support is rotatably connected to the circuit breaker base 500. The second end 420 is fixedly connected to the contact support. During rotation, the contact support can drive the moving contact rod 400 to rotate together. During rotation, the moving contact 400 can contact or separate from the stationary contact 130.

[0074] The groove 440 can be a groove structure provided on the movable contact rod 400. The groove 440 can penetrate the movable contact rod 400 along the thickness direction, and the groove opening of the groove 440 can face the contact portion 120. The groove 440 can be provided between the first end 410 and the second end 420, or the groove 440 can be provided on the movable contact rod 400 near the first end 410.

[0075] The groove 440 can be integrally formed with the moving contact rod 400 during the forming process, or the groove 440 can be set on the moving contact rod 400 by grooving or carving after the moving contact rod 400 is formed.

[0076] In summary, by providing a groove 440 on the moving contact rod 400, with the groove opening facing the contact portion 120, the distance between the moving contact rod 400 and the contact portion 120 can be increased. Thus, during the circuit breaker's breaking process, the distance between the moving contact 430 and the stationary contact 130 can always be less than the distance between the moving contact rod 400 and the contact portion 120. This reduces the probability of the arc transferring from between the moving contact 430 and the stationary contact 130 to between the moving contact rod 400 and the contact portion 120. Furthermore, this reduces the residence time of the arc between the moving contact and the stationary contact 100, improving the reliability of the arc extinguishing system.

[0077] Please continue to refer to Figure 2 as well as Figure 8 As shown, this application also provides a reinforcing rib 450 on the moving contact rod 400, and the reinforcing rib 450 is positioned close to the groove 440.

[0078] The reinforcing rib 450 can be a raised structure or a groove-like structure provided on the moving contact rod 400 near the groove 440. The reinforcing rib 450 can be integrally formed with the moving contact rod 400.

[0079] In summary, the addition of reinforcing rib 450 can improve the strength of the moving contact rod 400, reduce the probability of breakage due to reduced strength during use, improve the reliability of the moving contact rod 400, and thus improve the reliability of the arc extinguishing system.

[0080] Figure 9 This is a partial structural schematic diagram of the arc-extinguishing chamber provided in an embodiment of this application. Figure 3 as well as Figure 9 As shown, the arc-blocking cover 220 can cover part of the arc-extinguishing grid assembly.

[0081] The arc-blocking shield 220 can be connected to the arc-extinguishing grid assembly, or it can be connected to the side plate of the arc-extinguishing chamber 200. Part of the arc-blocking shield 220 can be located within the gap formed between two side plates of the arc-extinguishing chamber 200. The arc-blocking shield 220 can partially shield the arc-extinguishing grid assembly.

[0082] With the above-described configuration, this application includes an arc-isolating cover 220 within the arc-extinguishing chamber 200. The arc-isolating cover 220 can protect part of the arc-extinguishing grid assembly, thereby extending the service life of the arc-extinguishing grid assembly. Consequently, the service life of the arc-extinguishing system can be improved.

[0083] An arc-extinguishing chamber 200 is disposed on the contact portion 120, and the moving contact portion is disposed on one side of the stationary contact 100. When the arc-extinguishing system is installed in the base 500, both the stationary contact 130 and the moving contact 430 are located within the arc-extinguishing chamber 200. When the moving contact 430 separates from the stationary contact 130, an electric arc is generated between the moving contact 430 and the stationary contact 130, and the heat generated by the arc produces high-temperature gas.

[0084] Figure 10 This is a schematic diagram of the arc-damping shield provided in an embodiment of this application. To solve the above problems, such as... Figure 7 , Figure 9 as well as Figure 10 As shown, this application provides an exhaust groove 221 on the arc-blocking cover 220. The exhaust groove 221 is located on the side of the arc-blocking cover 220 away from the moving contact.

[0085] The exhaust groove 221 can be a groove structure provided on the arc-blocking cover 220. The exhaust groove 221 can be integrally formed with the arc-blocking cover 220, or the exhaust groove 221 can be provided on the arc-blocking cover 220 by grooving or carving after the arc-blocking cover 220 is formed.

[0086] In summary, the venting groove 221 can improve the venting efficiency of the arc-extinguishing chamber 200 and reduce the residence time of the high-temperature gas generated during the circuit breaker's breaking process in the arc-extinguishing chamber 200. This reduces the probability of damage to the arc-extinguishing chamber 200 due to the inability to expel the high-temperature gas in time, thereby improving the reliability of the arc-extinguishing chamber 200 and, consequently, the reliability of the arc-extinguishing system.

[0087] Please continue to refer to Figure 9 as well as Figure 10As shown, the arc-extinguishing grid assembly includes multiple arc-extinguishing grids 210, which are spaced apart. The arc-blocking cover 220 is provided with a first limiting protrusion 222, which is inserted into the gap between two adjacent arc-extinguishing grids 210.

[0088] Multiple arc-extinguishing grid plates 210 can be evenly spaced between the two side plates of the arc-extinguishing chamber 200, or the spacing between the multiple arc-extinguishing grid plates 210 can be different. In this way, when the circuit breaker breaks and generates an arc, the multiple arc-extinguishing grid plates 210 can cut the complete arc into multiple smaller arc segments for extinguishing.

[0089] The arc-blocking cover 220 has a first limiting protrusion 222 on the side facing the arc-extinguishing grid 210 it covers. The first limiting protrusion 222 can be a plate-like structure or a block-like structure. There can be one first limiting protrusion 222, or there can be multiple first limiting protrusions 222. When there are multiple first limiting protrusions 222, the maximum number of first limiting protrusions 222 must be one less than the number of arc-extinguishing grids 210. For example, when there are five arc-extinguishing grids 210, there can be a maximum of four first limiting protrusions 222.

[0090] It should be noted that the thickness of the first limiting protrusion 222 needs to be less than the distance between two adjacent arc-extinguishing grid plates 210, so that the first limiting protrusion 222 can be inserted into the interval between the multiple arc-extinguishing grid plates 210. When the first limiting protrusion 222 is inserted into the interval between two adjacent arc-extinguishing grid plates 210, the first limiting protrusion 222 can contact the two adjacent arc-extinguishing grid plates 210.

[0091] In summary, by providing a first limiting protrusion 222 on the arc-isolating shield 220 and inserting the first limiting protrusion 222 into the intervals of the multiple arc-extinguishing grid plates 210, the arc-extinguishing grid plates 210 can limit the first limiting protrusion 222, thereby limiting the arc-isolating shield 220. This reduces the probability of the arc-isolating shield 220 falling out of the arc-extinguishing chamber 200, thus improving the reliability of the arc-extinguishing system.

[0092] like Figure 4 , Figure 7 as well as Figure 9 As shown, the stationary contact 100 also includes a contact seat 121, and the arc-extinguishing grid 210 is provided with an arc-inducing plate 211. The contact seat 121 is disposed on the contact portion 120, and the contact seat 121 faces the moving contact. The arc-inducing plate 211 is bent toward the contact seat 121.

[0093] The contact seat 121 can be a raised structure or a recessed structure, or it can be a region on the contact portion 120. The contact seat 121 can be positioned toward the moving contact rod 400, so that when the contact support drives the moving contact rod 400 to rotate, the moving contact 430 can make contact with the stationary contact 130.

[0094] The arc-starting plate 211 can be a plate-like structure set on the arc-extinguishing grid plate 210 closest to the stationary contact 130. The arc-starting plate 211 can be integrally formed with the arc-extinguishing grid plate 210, or the arc-starting plate 211 can be set on the arc-extinguishing grid plate 210 by snap-fit ​​or adhesive after the arc-extinguishing grid plate 210 is formed.

[0095] The arc-starting plate 211 can be positioned towards the stationary contact 130, and the arc-starting plate 211 can be bent towards the contact seat 121. This application does not limit the bending angle of the arc-starting plate 211, and the bending angle of the arc-starting plate 211 can be set according to actual usage requirements.

[0096] In summary, when the circuit breaker breaks and generates an arc, the arc will be generated between the moving contact 430 and the stationary contact 130. At this time, the arc-inducing plate 211 provided on the arc-extinguishing grid 210 can attract the arc towards the arc-extinguishing grid 210. When the arc-inducing plate 211 bends towards the contact seat 121, the end of the arc-inducing plate 211 will be closer to the stationary contact 130, which can improve the efficiency of the arc-inducing plate 211 in attracting the arc.

[0097] like Figure 4 , Figure 8 as well as Figure 9 As shown, the contact base 121 extends toward the fixing part 110. The stationary contact 130 is provided on the side of the contact base 121 away from the fixing part 110.

[0098] Since both the moving contact 430 and the stationary contact 130 are located inside the arc-extinguishing chamber 200, and the arc-extinguishing chamber 200 is disposed on the contact portion 120, when the contact seat 121 extends toward the fixing portion 110, the contact seat 121 actually extends toward the interior of the arc-extinguishing chamber 200.

[0099] As the contact seat 121 extends towards the interior of the arc-extinguishing chamber 200, it becomes closer to the arc-initiating plate 211. Thus, when the arc-initiating plate 211 attracts the arc, the arc is transferred from the stationary contact 130 to the portion of the contact seat 121 extending towards the fixing part 110. This reduces the time the arc spends eroding the stationary contact 130. Reduced erosion time means less wear on the stationary contact 130, eliminating the need for frequent replacements and lowering the operating cost of the stationary contact 100. This, in turn, reduces the overall operating cost of the arc-extinguishing system.

Claims

1. An arc-extinguishing system applied to a circuit breaker, the circuit breaker comprising a base, characterized in that, The arc extinguishing system includes: A stationary contact includes a fixed part and a contact part that are connected to each other. The fixed part is connected to the base, and the contact part is provided with a guide groove that extends through the contact part. An arc-extinguishing chamber is disposed on the contact portion; A static cover is provided on the part of the contact portion that does not contact the arc-extinguishing chamber. The static cover has a hook and a limiting block on the side facing the contact portion. The hook passes through the flow guide groove and hooks to the side of the contact portion facing away from the static cover. The limiting block is located in the flow guide groove and contacts the groove wall of the flow guide groove.

2. The arc-extinguishing system according to claim 1, characterized in that, The static cover has a raised rib on the side facing the contact portion; The rib contacts the side wall of the contact portion facing the static cover.

3. The arc-extinguishing system according to claim 1, characterized in that, It also includes the moving contact rod; The movable contact rod is provided with a groove, and the groove opening faces the contact portion.

4. The arc-extinguishing system according to claim 3, characterized in that, The movable contact rod is also provided with reinforcing ribs, which are positioned close to the groove.

5. The arc-extinguishing system according to claim 4, characterized in that, The arc-extinguishing chamber includes an arc-extinguishing grid assembly and an arc-isolating cover; The arc-blocking cover is provided over part of the arc-extinguishing grid assembly.

6. The arc-extinguishing system according to claim 5, characterized in that, The arc-blocking cover is equipped with an exhaust groove; The exhaust channel is located on the side of the arc-blocking cover away from the moving contact.

7. The arc-extinguishing system according to claim 6, characterized in that, The arc-extinguishing grid assembly includes multiple arc-extinguishing grids, which are spaced apart. The arc-blocking cover is provided with a first limiting protrusion, which is inserted into the interval between two adjacent arc-extinguishing grid plates.

8. The arc-extinguishing system according to claim 7, characterized in that, The stationary contact also includes a contact seat, and the arc-extinguishing grid is provided with an arc-inducing plate; The contact seat is disposed on the contact portion, and the contact seat faces the moving contact; The arc-inducing plate is bent toward the contact seat.

9. The arc extinguishing system according to claim 8, characterized in that, The contact seat extends toward the fixing part; The contact seat is provided with a stationary contact, which is located on the side of the contact seat away from the fixing part.

10. A circuit breaker, characterized in that, Includes a base and an arc-extinguishing system as described in any one of claims 1 to 9; The arc-extinguishing system is located inside the base; The arc-extinguishing chamber's arc-blocking cover is provided with a second limiting protrusion; The base is provided with a limiting groove, and the second limiting protrusion is located in the limiting groove.

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