Arc extinguishing mechanism and circuit breaker

Abstract

The utility model provides an arc extinguishing mechanism and a circuit breaker, and belongs to the technical field of electrical equipment. The utility model provides an arc extinguishing mechanism and a circuit breaker, the arc extinguishing mechanism is applied to the circuit breaker, and the arc extinguishing mechanism comprises an arc extinguishing chamber, an arc isolating cover and a gas generating part. The arc extinguish chamber comprises a first side plate, a second side plate and a grid plate group, a gap is formed between the first side plate and the second side plate, and the grid plate group is arranged between the first side plate and the second side plate and fixedly connected to the first side plate and the second side plate. The arc isolating cover is installed in the arc extinguishing chamber and covers part of the arc extinguishing grid sheets in the grid sheet group, and the arc isolating cover is provided with an installation groove. And the gas generating part is mounted in the mounting groove, is detachably connected with the arc isolating cover and is exposed in the gap. According to the circuit breaker, the gas generating part is arranged in the arc extinguishing mechanism, the gas generating part can assist the arc extinguishing mechanism in arc extinguishing, and the gas generating part is detachably connected with the arc isolating cover, so that the later maintenance cost of the arc extinguishing mechanism is saved, and the use cost of the circuit breaker can be saved.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and particularly relates to an arc extinguishing mechanism and a circuit breaker. Background Art

[0002] A circuit breaker is an important switching device in a power mechanism, capable of opening, closing, carrying, and interrupting the current in a circuit. When the circuit breaker is tripped, an arc will be generated between the moving contact and the static contact. Usually, the arc generated between the moving contact and the static contact is transferred to the arc extinguishing mechanism of the circuit breaker, and then the arc is extinguished within the arc extinguishing mechanism.

[0003] In the prior art, a gas generating cover is usually arranged in the arc extinguishing mechanism to assist in arc extinguishing. However, the gas generating cover has a large loss during use, resulting in a high maintenance cost for the arc extinguishing mechanism in the later stage. Summary of the Utility Model

[0004] The present application provides an arc extinguishing mechanism and a circuit breaker to reduce the later maintenance cost of the arc extinguishing mechanism.

[0005] In a first aspect, the present application provides an arc extinguishing mechanism and a circuit breaker, which are applied to a circuit breaker. The arc extinguishing mechanism includes an arc extinguishing chamber, an arc dividing cover, and a gas generating member. The arc extinguishing chamber includes a first side plate, a second side plate, and a grid plate group. There is a gap between the first side plate and the second side plate. The grid plate group is arranged between the first side plate and the second side plate and is fixedly connected to the first side plate and the second side plate. The arc dividing cover is installed on the arc extinguishing chamber and covers a part of the arc extinguishing grids in the grid plate group. The arc dividing cover is provided with an installation groove. The gas generating member is installed in the installation groove, and the gas generating member is detachably connected to the arc dividing cover. The gas generating member is exposed in the gap.

[0006] Through the above solution, the present application arranges an arc dividing cover in the arc extinguishing mechanism. The arc dividing cover can protect part of the grid plate group, thereby improving the service life of the grid plate group. The installation groove provided on the arc dividing cover can be used to install the gas generating member. When the moving and static contacts are disconnected to generate an arc, the gas generating member can generate a large amount of gas to blow the arc, thus achieving the effect of assisting in arc extinguishing and improving the breaking performance of the circuit breaker. When the gas generating member is damaged or severely worn, the gas generating member can be replaced in time. In this way, it is not necessary to replace the entire arc dividing cover, saving the maintenance cost of the arc extinguishing mechanism and thus saving the use cost of the circuit breaker.

[0007] In a possible design, the installation groove includes a first groove and a second groove that communicate with each other. The first groove is a blind groove, and the second groove is a through groove provided on the bottom of the first groove. The cross-sectional area of the first groove is larger than the cross-sectional area of the second groove. The gas generating member includes a first plate and a second plate that are connected to each other. The first plate is located in the first groove, and the second plate is located in the second groove. The first plate and / or the second plate is exposed in the gap.

[0008] With the above solution, the first slot is a blind slot, and the second slot is a through slot opened at the bottom of the first slot. In this way, after the gas generating component is installed in the installation slot, part of the gas generating component can be exposed in the gap, and at the same time, the area of the through slot on the arc isolation cover can be reduced. Reducing the area of the through slot can reduce the possibility of the arc flowing into the arc isolation cover through the through slot, enabling the arc isolation cover to better protect the grid plate group. The first plate is connected to the second plate, and after the gas generating component is installed in the installation slot, the first plate is located in the first slot and the second plate is located in the second slot. This design is more stable compared to the installation method of a single slot and a single plate, reducing the possibility of the gas generating component falling out of the installation slot and improving the reliability of use of the arc extinguishing mechanism.

[0009] In a possible design, the first plate is in interference fit with the first slot, and / or the second plate is in interference fit with the second slot.

[0010] With the above solution, the gas generating component and the installation slot are connected by an interference fit. Such a connection method has a simple structure, which can reduce the manufacturing difficulty of the arc isolation cover. Moreover, the first plate is in interference fit with the first slot, and the second plate is in interference fit with the second slot, which can enable the first plate and the second plate to have good centering properties, reducing the probability of the first plate and the second plate shifting and falling out of the installation slot when the gas generating component is eroded by the arc, and improving the reliability of use of the arc extinguishing mechanism.

[0011] In a possible design, a slot is provided at the bottom of the first slot. An insert bar that mates with the slot is provided on the first plate. The insert bar is located in the slot and is in interference fit with the slot.

[0012] With the above solution, by using the interference fit between the insert bar and the slot, the gas generating component can be fixed in the installation slot, and the mating structure of the insert bar and the slot is simple and easy to manufacture. In addition, the mating of the insert bar and the slot can also play a guiding role for the gas generating component during the installation process of the gas generating component, simplifying the installation difficulty of the gas generating component, improving the assembly speed of the arc extinguishing mechanism, and reducing the time cost of circuit breaker production.

[0013] In a possible design, a slot is provided at the bottom of the first slot, and the slot penetrates the bottom of the first slot. An insert bar that mates with the slot is provided on the first plate, and a hook is provided at one end of the insert bar away from the first plate. The insert bar is located in the slot, and the hook passes through the slot and is snap-fitted with the arc isolation cover.

[0014] With the above solution, a hook is provided at one end of the insert bar away from the first plate, and the gas generating component is fixed by using the hook to be snap-fitted with the arc isolation cover. In this way, the fixation of the gas generating component can be made more firm, reducing the probability of the gas generating component falling out of the installation slot and increasing the reliability of use of the arc extinguishing mechanism.

[0015] In a possible design, a slot is provided at the bottom of the first slot, and the slot penetrates through the bottom of the first slot. An insertion bar that mates with the slot is provided on the first plate, and a hook is provided at one end of the insertion bar away from the first plate. A limiting block is provided on the slot wall of the slot. The insertion bar is located within the slot, and the hook is engaged with the limiting block.

[0016] With the above solution, the slot is set as a trapezoidal slot, and the hook is engaged with the limiting block within the slot. This not only makes the fixation of the gas-producing component more secure, but also prevents the hook from protruding from the side wall of the arc isolation cover. In this way, the probability of the problem that the hook protruding from the side wall of the arc isolation cover affects the movement of the moving contact during the separation of the moving contact and the static contact is reduced, and the reliability of the circuit breaker during use is increased.

[0017] In a possible design, the circuit breaker includes a moving contact and a static contact that cooperate with each other. The arc extinguishing grid includes a first segment, a connecting segment, and a second segment that are sequentially connected. The first segment and the second segment are spaced apart. The first segment is mounted on the first side plate, and the second segment is mounted on the second side plate. The number of arc isolation covers is two, and the two arc isolation covers respectively cover the first segment and the second segment, and there is a channel for the moving contact to move between the two arc isolation covers. Gas-producing components are provided on both of the two arc isolation covers, and the gas-producing components are arranged close to the static contact.

[0018] With the above solution, by providing two arc isolation covers, with one arc isolation cover covering the first segment of the arc extinguishing grid and the other arc isolation cover covering the second segment, the first segment and the second segment of the arc extinguishing grid can be protected by the arc isolation covers, thereby increasing the service life of the arc extinguishing grid. Gas-producing components are provided on both of the two arc isolation covers to increase the gas production amount when the moving and static contacts are disconnected, thereby improving the auxiliary effect of the gas-producing components on arc extinguishing. The gas-producing components are arranged close to the static contact. When the moving and static contacts are separated, the energy generated at the contact point of the moving and static contacts is the largest, and the arc can erode the gas-producing components immediately when it is released, causing the gas-producing components to generate gas. In this way, the gas-producing components generate a high-speed gas flow to push the arc into the arc extinguishing chamber for arc extinguishing, which can improve the breaking performance of the circuit breaker.

[0019] In a possible design, the side of the gas-producing component facing the channel does not protrude beyond the side of the arc isolation cover facing the channel.

[0020] With the above solution, the influence of the gas-producing component on the movement of the moving contact can be reduced, and the probability of the problem that the second plate collides with the moving contact during the movement of the moving contact is reduced. The reliability of the arc extinguishing mechanism during use is improved, thereby increasing the reliability of the circuit breaker during use.

[0021] In a possible design, the arc isolation cover is provided with a gas diversion hole, and the diversion hole is communicated with the gap.

[0022] Through the above solution, the gas diversion holes can divert the gas generated inside the arc isolation cover to the gap, reducing the probability of separation problems occurring in the first side plate, the second side plate, and the grid plate group due to the gas generated by the gas generating component, and increasing the reliability of use of the arc extinguishing mechanism.

[0023] In a second aspect, the present application provides a circuit breaker, including a contact set and the arc extinguishing mechanism mentioned in the first aspect above. The contact set is partially disposed inside the arc extinguishing mechanism.

[0024] Through the above solution, the present application provides a gas generating component inside the arc extinguishing mechanism. The arc generated when the moving and static contacts are separated can cause the gas generating component to generate gas, and the gas generated by the gas generating component can blow the arc towards the arc extinguishing grid plates, thereby improving the arc extinguishing effect of the arc extinguishing mechanism, increasing the arc extinguishing efficiency of the arc extinguishing mechanism, and improving the breaking performance of the circuit breaker.

[0025] Moreover, the gas generating component and the arc isolation cover are detachably connected. When the gas generating component is damaged or severely worn during use, the gas generating component can be disassembled and replaced separately. In this way, the later maintenance cost of the arc extinguishing mechanism is saved, and thus the use cost of the circuit breaker can be saved.

[0026] For the circuit breaker provided in the second aspect above, the beneficial effects can refer to the beneficial effects brought by the first aspect and various possible implementation manners of the first aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the arc extinguishing mechanism provided by an embodiment of the present application.

[0028] Figure 2 It is a schematic structural diagram of the arc extinguishing chamber provided by an embodiment of the present application.

[0029] Figure 3 It is a schematic structural diagram of the arc isolation cover provided by an embodiment of the present application from one perspective.

[0030] Figure 4 It is a schematic structural diagram of the gas generating component provided by an embodiment of the present application.

[0031] Figure 5 It is an assembly drawing of the arc isolation cover and the gas generating component provided by an embodiment of the present application from one perspective.

[0032] Figure 6 It is an assembly drawing of the arc isolation cover and the gas generating component provided by an embodiment of the present application from another perspective.

[0033] Figure 7 It is a schematic structural diagram of the arc isolation cover provided by an embodiment of the present application from another perspective.

[0034] Figure 8 isFigure 7 Enlarged view of part B

[0035] Figure 9 For Figure 6 Enlarged view of part A

[0036] Explanation of reference numerals:

[0037] 100, arc extinguishing chamber; 110, first side plate; 120, second side plate; 130, arc extinguishing grid; 131, first segment; 132, connecting segment; 133, second segment;

[0038] 200, arc separating cover; 210, mounting groove; 211, first groove; 212, second groove; 220, slot; 230, limiting block; 240, gas diversion hole;

[0039] 300, gas generating component; 310, first plate; 320, second plate; 330, insert bar; 331, hook. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] The terms "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover without excluding other content. The word "a" or "an" does not exclude the presence of a plurality.

[0043] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase "embodiments" appearing in various places in the specification is not necessarily referring to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0044] In this text, the term "and / or" is merely a description of the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this text, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0045] All directional terms appearing in the following descriptions are the directions shown in the figures, and do not limit the static contact of a circuit breaker in this application and the specific structure of the circuit breaker. For example, in the description of this application, terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of this application.

[0046] In addition, terms such as "first", "second", etc. in the description of this application and the claims or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more of such features.

[0047] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, the "connection" or "coupling" of a mechanical structure can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through screws, bolts, or other fixing members; a physical connection can also be a detachable connection, such as a snap connection or a snap-fit connection; a physical connection can also be an integral connection, such as a welded connection, an adhesive connection, or an integrally formed connection. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings.

[0049] Figure 1 It is a schematic structural diagram of the arc extinguishing mechanism provided for the embodiment of this application. As Figure 1 shown, this application provides a circuit breaker, including a contact group and an arc extinguishing mechanism. The contact group is partially disposed within the arc extinguishing mechanism.

[0050] The contact set includes a moving contact and a static contact. The moving contact is movably connected inside the circuit breaker, and the static contact is fixed inside the circuit breaker. When the circuit breaker is conducting normally, the moving contact abuts against the static contact. When the circuit breaker is disconnected, the moving contact separates from the static contact, and an arc will be generated between the moving contact and the static contact.

[0051] The contact point between the moving contact and the static contact can be located inside the arc extinguishing mechanism, or the moving path of the moving contact is inside the arc extinguishing mechanism. In this way, when the moving contact separates from the static contact, the generated arc can be extinguished by the arc extinguishing chamber 100, thereby increasing the reliability of the circuit breaker.

[0052] The arc extinguishing mechanism includes arc extinguishing grid plates 130 and an arc separating cover 200. The arc separating cover 200 can play a certain protective role for the arc extinguishing grid plates 130. A gas generating member 300 is detachably connected to the arc separating cover 200. When the moving contact separates from the static contact, the generated arc can cause the gas generating member 300 to generate gas, and the gas generated by the gas generating member 300 can blow the arc towards the arc extinguishing grid plates 130, thereby improving the arc extinguishing effect of the arc extinguishing mechanism.

[0053] In summary, in this application, the gas generating member 300 is provided inside the arc extinguishing mechanism. The arc generated when the moving and static contacts separate can cause the gas generating member 300 to generate gas, and the gas generated by the gas generating member 300 can blow the arc towards the arc extinguishing grid plates 130, thereby improving the arc extinguishing effect of the arc extinguishing mechanism, increasing the arc extinguishing efficiency of the arc extinguishing mechanism, and improving the breaking performance of the circuit breaker.

[0054] Moreover, the gas generating member 300 and the arc separating cover 200 are detachably connected. When the gas generating member 300 is damaged or severely worn during use, the gas generating member 300 can be disassembled and replaced separately. In this way, the later maintenance cost of the arc extinguishing mechanism is saved, and thus the use cost of the circuit breaker can be saved.

[0055] Figure 2 It is a schematic structural diagram of the arc extinguishing chamber provided by an embodiment of this application. As Figure 1 and Figure 2 shown, this application provides an arc extinguishing mechanism and a circuit breaker, which are applied to the circuit breaker. The arc extinguishing mechanism includes an arc extinguishing chamber 100, an arc separating cover 200, and a gas generating member 300. The arc extinguishing chamber 100 includes a first side plate 110, a second side plate 120, and a grid plate group. There is a gap between the first side plate 110 and the second side plate 120. The grid plate group is disposed between the first side plate 110 and the second side plate 120 and is fixedly connected to the first side plate 110 and the second side plate 120.

[0056] Figure 3 It is a schematic structural diagram of the arc separating cover provided by an embodiment of this application from a perspective. Figure 4 It is a schematic structural diagram of the gas generating member provided by an embodiment of this application. Combining Figure 1 、Figure 3 and Figure 4 As shown in Figure 4 , the arc separation cover 200 is installed on the arc extinguishing chamber 100 and covers a part of the arc extinguishing grids 130 in the grid group. The arc separation cover 200 is provided with an installation groove 210. The gas generating member 300 is installed in the installation groove 210. The gas generating member 300 is detachably connected to the arc separation cover 200, and the gas generating member 300 is exposed in the gap.

[0057] The first side plate 110 can be a plate-like structure, and the second side plate 120 can also be a plate-like structure. The first side plate 110 can be arranged parallel to the second side plate 120, and there can be a gap between the first side plate 110 and the second side plate 120, so that the grid group can be installed between the first side plate 110 and the second side plate 120. The contact point between the moving contact and the static contact can be located in this gap. In this way, the arc generated when the moving contact and the static contact are separated can be cut off by the grid group also located in this gap to achieve the effect of arc extinguishing.

[0058] The grid group can include a plurality of arc extinguishing grids 130, and the plurality of arc extinguishing grids 130 can be stacked at equal intervals to facilitate cutting off the arc. One side of the arc extinguishing grid 130 can be fixedly connected to the first side plate 110, and at the same time, the other side of the arc extinguishing grid 130 can be fixedly connected to the second side plate 120. The arc extinguishing grid 130 and the first side plate 110 can be connected by riveting, and the arc extinguishing grid 130 and the second side plate 120 can also be connected by riveting.

[0059] The arc separation cover 200 can be connected to the grid group, and the arc separation cover 200 can also be connected to the first side plate 110 and / or the second side plate 120. A part of the arc separation cover 200 can be located in the gap between the first side plate 110 and the second side plate 120. The arc separation cover 200 can shield a part of the grid group to protect the grid group.

[0060] The side wall of the arc separation cover 200 located in the gap between the first side plate 110 and the second side plate 120 can be provided with an installation groove 210, and the gas generating member 300 can be installed in this installation groove 210. Exemplarily, the gas generating member 300 can be arranged in the installation groove 210 by means of plugging, clamping or interference connection. When the arc generated by the separation of the moving contact and the static contact in the gap erodes the gas generating member 300, the gas generating member 300 eroded by the arc can generate a large amount of gas, increasing the pressure in the arc extinguishing mechanism and forming a pressure difference with the outside, so as to blow the arc to achieve the effect of auxiliary arc extinguishing.

[0061] In summary, in the arc extinguishing mechanism of the present application, an arc isolating cover 200 is provided. The arc isolating cover 200 can protect part of the grid plate group, and can improve the service life of the grid plate group. The installation groove 210 provided on the arc isolating cover 200 can be used to install the gas generating component 300. When the moving and static contacts are disconnected to generate an arc, the gas generating component 300 can generate a large amount of gas to blow the arc, thus achieving an auxiliary arc extinguishing effect and improving the breaking performance of the circuit breaker.

[0062] Among them, the gas generating component 300 is detachably connected to the arc isolating cover 200. Therefore, when the gas generating component 300 is damaged or severely worn, the gas generating component 300 can be replaced in time. In this way, it is not necessary to replace the entire arc isolating cover 200, saving the maintenance cost of the arc extinguishing mechanism and thus saving the use cost of the circuit breaker.

[0063] As Figure 3 shown, the installation groove 210 includes a first groove 211 and a second groove 212 that communicate with each other. The first groove 211 is a blind groove, and the second groove 212 is a through groove provided on the bottom of the first groove 211. The cross-sectional area of the first groove 211 is larger than the cross-sectional area of the second groove 212.

[0064] Figure 5 This is an assembly drawing of the arc isolating cover and the gas generating component provided by an embodiment of the present application from one perspective. Figure 6 This is an assembly drawing of the arc isolating cover and the gas generating component provided by an embodiment of the present application from another perspective. As Figures 4 to 6 shown, the gas generating component 300 includes a first plate 310 and a second plate 320 that are connected to each other. The first plate 310 is located in the first groove 211, and the second plate 320 is located in the second groove 212. The first plate 310 and / or the second plate 320 are exposed in the gap.

[0065] The first groove 211 can be a blind groove opened on the side wall of the arc isolating cover 200 close to the gap. The area of the bottom of the first groove 211 can be larger than the area of the second groove 212, so that the second groove 212 can be opened on the bottom of the first groove 211.

[0066] The first plate 310 is provided on one side of the second plate 320, and the first plate 310 and the second plate 320 can be fixedly connected. The shape of the first plate 310 can be the same as the shape of the first groove 211. The cross-sectional area of the first plate 310 can be the same as the cross-sectional area of the first groove 211, or the cross-sectional area of the first plate 310 can be slightly larger than the cross-sectional area of the first groove 211.

[0067] Actually, the cross-sectional area of the first plate 310 can also be slightly smaller than the cross-sectional area of the first groove 211. In this way, when the gas generating component 300 is installed on the arc isolating cover 200, the installation groove 210 will not interfere with the installation of the first plate 310.

[0068] The shape of the second plate 320 can be the same as that of the second groove 212. The cross-sectional area of the second plate 320 can be the same as the cross-sectional area of the second groove 212, or the cross-sectional area of the second plate 320 can be slightly larger than the cross-sectional area of the second groove 212, or the cross-sectional area of the second plate 320 can be slightly smaller than the cross-sectional area of the second groove 212. In this way, when the gas generating member 300 is installed on the arc isolation cover 200, the installation groove 210 will not interfere with the installation of the second plate 320.

[0069] When the cross-sectional area of the second plate 320 is the same as the cross-sectional area of the second groove 212, or when the cross-sectional area of the second plate 320 is slightly larger than the cross-sectional area of the second groove 212, the second plate 320 is exposed in the gap. When the cross-sectional area of the second plate 320 is slightly smaller than the cross-sectional area of the second groove 212, the second plate 320 and a part of the first plate 310 are exposed in the gap.

[0070] In summary, the first groove 211 is a blind groove, and the second groove 212 is a through groove opened at the bottom of the first groove 211. In this way, after the gas generating member 300 is installed in the installation groove 210, part of the gas generating member 300 can be exposed in the gap, and the area of the through groove on the arc isolation cover 200 can be reduced. Reducing the through groove area can reduce the possibility of the arc flowing into the arc isolation cover 200 from the through groove, enabling the arc isolation cover 200 to better protect the grid plate group. The first plate 310 is connected to the second plate 320, and after the gas generating member 300 is installed in the installation groove 210, the first plate 310 is located in the first groove 211, and the second plate 320 is located in the second groove 212. This design is more stable compared to the single-groove and single-plate installation method, reducing the possibility of the gas generating member 300 falling out of the installation groove 210 and improving the reliability of use of the arc extinguishing mechanism.

[0071] Please continue to refer to Figure 5 and Figure 6 As shown, in some embodiments, the first plate 310 is in interference fit with the first groove 211, and / or the second plate 320 is in interference fit with the second groove 212.

[0072] When the cross-sectional area of the first plate 310 is slightly larger than the cross-sectional area of the first groove 211, or when the cross-sectional area of the first plate 310 is the same as the cross-sectional area of the first groove 211, the first plate 310 is in interference fit with the first groove 211. When the cross-sectional area of the second plate 320 is slightly larger than the cross-sectional area of the second groove 212, or when the cross-sectional area of the second plate 320 is the same as the cross-sectional area of the second groove 212, the second plate 320 is in interference fit with the second groove 212.

[0073] With the above settings, the gas generating component 300 is connected to the installation groove 210 by interference fit. Such a connection method has a simple structure, which can reduce the manufacturing difficulty of the arc isolation cover 200. Moreover, the first plate 310 is in interference fit with the first groove 211, and the second plate 320 is in interference fit with the second groove 212, which can make the first plate 310 and the second plate 320 have good centering, reduce the probability of the first plate 310 and the second plate 320 shifting when the gas generating component 300 is eroded by the arc and falling out of the installation groove 210, and improve the use reliability of the arc extinguishing mechanism.

[0074] As Figure 3 and Figure 4 shown, a slot 220 is provided at the bottom of the first groove 211. An insertion bar 330 is provided on the first plate 310 and is matched with the slot 220. The insertion bar 330 is located in the slot 220 and is in interference fit with the slot 220.

[0075] Since a second groove 212 penetrating the bottom of the first groove 211 is also provided at the bottom of the first groove 211, in order to avoid interference between the slot 220 and the second groove 212, the slot 220 can be provided on one side of the second groove 212.

[0076] The insertion bar 330 can be provided on the side of the first plate 310 facing the first groove 211. The cross-sectional area of the slot 220 can be the same as the cross-sectional area of the slot 220, or the cross-sectional area of the slot 220 can be slightly larger than the cross-sectional area of the slot 220. In this way, interference fit can be achieved between the insertion bar 330 and the slot 220. There can be one slot 220, or there can be multiple slots 220. Correspondingly, there can be one insertion bar 330, or there can be multiple insertion bars 330. The number of insertion bars 330 should be the same as the number of slots 220.

[0077] With the above settings, by using the interference fit between the insertion bar 330 and the slot 220, the gas generating component 300 can be fixed in the installation groove 210, and the matching structure of the insertion bar 330 and the slot 220 is simple and convenient for manufacturing. Moreover, the cooperation between the insertion bar 330 and the slot 220 can also play a guiding role in the installation process of the gas generating component 300, simplify the installation difficulty of the gas generating component 300, improve the assembly speed of the arc extinguishing mechanism, and reduce the time cost of circuit breaker production.

[0078] Continue to refer to Figure 3 and Figure 4As shown, a slot 220 is provided at the bottom of the first groove 211, and the slot 220 penetrates the bottom of the first groove 211. An insertion bar 330 that mates with the slot 220 is provided on the first plate 310, and a hook 331 is provided at one end of the insertion bar 330 away from the first plate 310. The insertion bar 330 is located within the slot 220, and the hook 331 passes through the slot 220 and is snap-connected to the arc isolation cover 200.

[0079] The slot 220 penetrates the bottom of the first groove 211, that is to say, the slot 220 penetrates the side wall of the arc isolation cover 200. The insertion bar 330 includes two opposite ends. One end of the insertion bar 330 close to the first plate 310 is fixedly connected to the first plate 310, and a hook 331 is provided at the end of the insertion bar 330 away from the first plate 310. When the gas generating member 300 is installed in the installation groove 210, the end of the insertion bar 330 provided with the hook 331 passes through the slot 220 and is snap-connected to the side wall of the arc isolation cover 200, so that the gas generating member 300 is fixed within the installation groove 210.

[0080] Through the above arrangement, a hook 331 is provided at the end of the insertion bar 330 away from the first plate 310, and the hook 331 is snap-connected to the arc isolation cover 200 to fix the gas generating member 300. In this way, the fixation of the gas generating member 300 can be made more firm, the probability of the gas generating member 300 falling out of the installation groove 210 is reduced, and the reliability of use of the arc extinguishing mechanism is increased.

[0081] Figure 7 It is a schematic structural view of the arc isolation cover provided by the embodiment of the present application from another perspective. Figure 8 It is Figure 7 an enlarged view of part B in Figure 9 It is Figure 6 an enlarged view of part A in Figures 7 to 9 As shown, a slot 220 is provided at the bottom of the first groove 211, and the slot 220 penetrates the bottom of the first groove 211. An insertion bar 330 that mates with the slot 220 is provided on the first plate 310, and a hook 331 is provided at one end of the insertion bar 330 away from the first plate 310. A limiting block 230 is provided on the wall of the slot 220. The insertion bar 330 is located within the slot 220, and the hook 331 is snap-connected to the limiting block 230.

[0082] The insertion bar 330 and the hook 331 have been described in detail above and will not be elaborated here.

[0083] The limiting block 230 is fixedly provided on the wall of the slot 220, so that the slot 220 forms a stepped slot. When the gas generating member 300 is installed in the installation groove 210, the insertion bar 330 is located within the slot 220, the hook 331 is snap-connected to the limiting block 230, and the hook 331 does not protrude from the side wall of the arc isolation cover 200.

[0084] With the above settings, the slot 220 is set as a trapezoidal slot, and the hook 331 is engaged with the limiting block 230 in the slot 220. This not only makes the fixation of the gas generating part 300 more reliable, but also prevents the hook 331 from protruding from the side wall of the arc isolation cover 200. In this way, the probability of the problem that the hook 331 protruding from the side wall of the arc isolation cover 200 affects the movement of the moving contact during the separation of the moving contact and the static contact is reduced, and the reliability of the circuit breaker in use is increased.

[0085] As Figure 1 and Figure 2 shown, the circuit breaker includes a moving contact and a static contact that cooperate with each other. The arc extinguishing grid 130 includes a first segment 131, a connecting segment 132, and a second segment 133 that are sequentially connected. The first segment 131 and the second segment 133 are arranged at intervals. The first segment 131 is installed on the first side plate 110, and the second segment 133 is installed on the second side plate 120. The number of arc isolation covers 200 is two, and the two arc isolation covers 200 respectively cover the first segment 131 and the second segment 133, and there is a channel for the movement of the moving contact between the two arc isolation covers 200. Gas generating parts 300 are provided on both of the two arc isolation covers 200, and the gas generating parts 300 are arranged close to the static contact.

[0086] The arc extinguishing grid 130 can be U-shaped. The first segment 131 and the second segment 133 can be parallel to each other, or the first segment 131 and the second segment 133 can be arranged non-parallelly. Multiple arc extinguishing grids 130 can be arranged at intervals to form a grid group. The arc generated by the breaking of the moving contact and the static contact can be cut by the multiple arc extinguishing grids 130.

[0087] The structures of the two arc isolation covers 200 can be exactly the same. One of the arc isolation covers 200 can cover the first segment 131, and the other arc isolation cover 200 can cover the second segment 133. After the two arc isolation covers 200 are both installed on the grid group, the gap generated between the two arc isolation covers 200 is the channel for the movement of the moving contact. When the moving and static contacts are separated to generate an arc, the generated arc can be cut by the connecting segment 132.

[0088] Gas generating parts 300 are provided on both of the two arc isolation covers 200, and the two gas generating parts 300 can be arranged opposite to each other. When the gas generating parts 300 are arranged close to the static contact, the contact point of the moving contact and the static contact will also be close to the gas generating parts 300.

[0089] In summary, by providing two arc separation covers 200, with one arc separation cover 200 covering the first segment 131 and the other arc separation cover 200 covering the second segment 133 of the arc extinguishing grid 130, the first segment 131 and the second segment 133 of the arc extinguishing grid 130 can be protected by the arc separation covers 200, thereby increasing the service life of the arc extinguishing grid 130. Gas generating members 300 are provided on both of the two arc separation covers 200 to increase the gas generation amount when the moving and static contacts are separated, so as to improve the auxiliary effect of the gas generating members 300 on arc extinguishing. The gas generating members 300 are arranged close to the static contact. When the moving and static contacts are separated, the energy generated at the contact point of the moving and static contacts is the largest, and the arc can erode the gas generating members 300 at the moment of being released, so that the gas generating members 300 generate gas. In this way, the gas generating members 300 generate a high-speed gas flow to push the arc into the arc extinguishing chamber 100 for arc extinguishing, which can improve the breaking performance of the circuit breaker.

[0090] As Figure 1 and Figure 6 shown, the side of the gas generating member 300 facing the channel does not protrude beyond the side of the arc separation cover 200 facing the channel.

[0091] The side wall of the second plate 320 facing the channel can be flush with the side wall of the arc separation cover 200 facing the channel, or the side wall of the second plate 320 facing the channel can be located in the second groove 212.

[0092] Through the above arrangement, the influence of the gas generating member 300 on the movement of the moving contact can be reduced, and the probability of the problem that the second plate 320 collides with the moving contact during the movement of the moving contact is reduced. The use reliability of the arc extinguishing mechanism is improved, thereby increasing the use reliability of the circuit breaker.

[0093] Since the grid group is connected to the first side plate 110 and the second side plate 120 by riveting, during the process of the gas generating member 300 generating gas, gas is also generated inside the arc separation cover 200. And because the arc separation cover 200 is connected to the grid group, in this way, the gas generated inside the arc separation cover 200 may impact the first side plate 110 and / or the second side plate 120, resulting in the separation of the first side plate 110, the second side plate 120 and the grid group. To reduce the possibility of the above problems occurring, the following improvements are made in this application.

[0094] As Figure 1 and Figure 3 shown, the arc separation cover 200 is provided with a gas diversion hole 240, and the gas diversion hole 240 is communicated with the gap.

[0095] The gas diversion hole 240 can be a through hole opened on the side wall of the arc separation cover 200, and the gas diversion hole 240 can communicate the inside of the arc separation cover 200 with the channel.

[0096] In summary, the gas diversion holes 240 can divert the gas generated inside the arc isolation cover 200 into the gap, reducing the probability of separation problems occurring in the first side plate 110, the second side plate 120, and the grid plate group due to the gas generated by the gas generating component 300, and increasing the reliability of use of the arc extinguishing mechanism.

Claims

1. An arc extinguishing mechanism, applied to a circuit breaker, is characterized in that, Comprising: An arc extinguishing chamber, including a first side plate, a second side plate and a grid plate group. There is a gap between the first side plate and the second side plate. The grid plate group is arranged between the first side plate and the second side plate and is fixedly connected to the first side plate and the second side plate; An arc separating cover, installed on the arc extinguishing chamber and covering a part of the arc extinguishing grid plates in the grid plate group. The arc separating cover is provided with a mounting groove; A gas generating component, installed in the mounting groove. The gas generating component is detachably connected to the arc separating cover, and the gas generating component is exposed in the gap.

2. The arc extinguishing mechanism according to claim 1, characterized in that, The mounting groove includes a first groove and a second groove that communicate with each other. The first groove is a blind groove, and the second groove is a through groove provided on the bottom of the first groove. The cross-sectional area of the first groove is larger than the cross-sectional area of the second groove; The gas generating component includes a first plate and a second plate connected to each other. The first plate is located in the first groove, and the second plate is located in the second groove; The first plate and / or the second plate is exposed in the gap.

3. The arc extinguishing mechanism according to claim 2, characterized in that, The first plate is in interference fit with the first groove, and / or, the second plate is in interference fit with the second groove.

4. The arc extinguishing mechanism according to claim 3, characterized in that, The bottom of the first groove is provided with a slot; The first plate is provided with an insert bar that cooperates with the slot. The insert bar is located in the slot, and the insert bar is in interference fit with the slot.

5. The arc extinguishing mechanism according to claim 3, characterized in that, The bottom of the first groove is provided with a slot that penetrates the bottom of the first groove; The first plate is provided with an insert bar that cooperates with the slot. One end of the insert bar away from the first plate is provided with a hook; The insert bar is located in the slot, and the hook passes through the slot and is clamped with the arc separating cover.

6. The arc extinguishing mechanism according to claim 3, characterized in that, The bottom of the first groove is provided with a slot that penetrates the bottom of the first groove; The first plate is provided with an insert bar that cooperates with the slot. One end of the insert bar away from the first plate is provided with a hook; The wall of the slot is provided with a limiting block. The insert bar is located in the slot, and the hook is clamped with the limiting block.

7. The arc extinguishing mechanism according to claim 1, characterized in that, The circuit breaker includes a moving contact and a static contact that cooperate with each other. The arc extinguishing grid plates include a first segment, a connecting segment and a second segment connected in sequence. The first segment and the second segment are arranged at intervals. The first segment is installed on the first side plate, and the second segment is installed on the second side plate; The number of the arc separating covers is two. The two arc separating covers respectively cover the first segment and the second segment, and there is a channel for the moving contact to move between the two arc separating covers; The two arc separating covers are both provided with the gas generating component, and the gas generating component is arranged close to the static contact.

8. The arc extinguishing mechanism according to claim 7, characterized in that, The side of the gas generating component facing the channel does not protrude beyond the side of the arc separating cover facing the channel.

9. The arc extinguishing mechanism according to any one of claims 1-8, characterized in that, The arc separating cover is provided with a gas diversion hole, and the gas diversion hole communicates with the gap.

10. A circuit breaker, characterized in that, Comprising a contact group and the arc extinguishing mechanism according to any one of claims 1 to 9; Part of the contact group is arranged in the arc extinguishing mechanism.

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