Switch arc extinguishing structure and arc extinguishing circuit breaker

Abstract

The utility model provides a switch arc extinguishing structure and an arc extinguishing circuit breaker, and relates to the technical field of electrical components. The switch arc extinguishing structure comprises a switch shell, a contact system and an arc extinguishing following structure, the contact system comprises a static contact assembly and a moving contact assembly, the moving contact assembly comprises a moving contact, a moving contact support and a rotating mechanism, and the moving contact is fixed on the moving contact support to realize disconnection and connection of the moving contact and the static contact assembly; the arc extinguishing following structure is fixed on the moving contact support, the arc extinguishing following structure comprises a hollow part and a solid part, and when the moving contact and the static contact assembly are disconnected, the solid part is located between the moving contact and the static contact assembly; when the moving contact and the static contact assembly are closed, the hollow part is located between the moving contact and the static contact assembly. The arc extinguishing following structure can move along with the movement of the moving contact support, so that the arc between the moving contact and the static contact assembly can be quickly separated, and the moving contact or the static contact assembly can be protected from being ablated.

Description

Technical Field

[0001] This application relates to the technical field of electrical components, and particularly to a switch arc extinguishing structure and an arc extinguishing circuit breaker. Background Art

[0002] The on-off and conversion of a circuit are realized through the contact system in the switch of the circuit. The contact system mainly includes a static contact and a moving contact. The process of the static contact and the moving contact being connected and disconnected is accompanied by a gas discharge phenomenon, that is, an arc is generated. The arc is harmful to electrical appliances. For example, the appearance of the arc will delay the disconnection process of the circuit, burn the contact system, shorten the life of the contact system and even the electrical components in the entire circuit, and may even cause fires and personal injury accidents. The arc is also the main way for the electromagnetic energy stored in the circuit to be released. Without this, it is difficult to reduce the overvoltage that appears when the circuit is disconnected. The operation of the contact system is closely related to the arc. It may be burned by the high-temperature arc during operation, and thus mass transfer and electrical erosion occur. Therefore, it is necessary to extinguish the arc in time at the moment when the arc is generated.

[0003] In the prior art, after the contact system is disconnected to generate an arc, the gas generating piece generates gas, and the gas blows the arc into the arc extinguishing chamber to extinguish the arc. However, this form of arc extinguishing cannot ensure that the static and moving contacts are effectively separated within a short time, resulting in too fast ablation of the contact points of the contacts. Summary of the Utility Model

[0004] This application provides a switch arc extinguishing structure and an arc extinguishing circuit breaker to solve the problems of slow arc extinguishing speed and poor arc extinguishing effect in the prior art.

[0005] In a first aspect, this application provides a switch arc extinguishing structure, including: a switch housing; a contact system, the contact system includes a static contact assembly and a moving contact assembly; the static contact assembly is fixed in the switch housing, the moving contact assembly includes a moving contact, a moving contact support and a rotating mechanism, the moving contact is fixed on the moving contact support, the moving contact support is fixed on the switch housing through the rotating mechanism, and the rotating mechanism drives the moving contact support to operate under an external force to realize the disconnection and closing of the moving contact and the static contact assembly; an arc extinguishing following structure, fixed on the moving contact support, the arc extinguishing following structure includes a hollow part and a solid part, the arc extinguishing following structure has a first state and a second state following the operating state of the moving contact support. When the moving contact is disconnected from the static contact assembly, the arc extinguishing following structure is in the first state; when the moving contact is closed with the static contact assembly, the arc extinguishing following structure is in the second state; in the first state, the solid part is located between the moving contact and the static contact assembly; in the second state, the hollow part is located between the moving contact and the static contact assembly.

[0006] Through the above solution, when the moving contact and the static contact assembly are disconnected instantaneously, the arc extinguishing following structure can move closely following the operating state of the moving contact support, so that the solid part is located between the moving contact and the static contact assembly to cut off the generated arc, thereby quickly isolating the arc between the moving contact and the static contact assembly and protecting the moving contact or the static contact assembly from ablation.

[0007] In a possible design, the arc extinguishing following structure further includes a connecting part, the connecting part is rotatably connected to the moving contact support, and the connecting part sequentially connects the solid part and the hollow part in the direction from being close to the moving contact support to being far from the moving contact support; the arc extinguishing following structure rotates following the operation of the moving contact support; when the moving contact support drives the moving contact to be disconnected from the static contact assembly, the arc extinguishing following structure rotates relative to the moving contact support, so that the solid part moves between the moving contact and the static contact assembly.

[0008] Through the above solution, the connecting part is rotatably connected to the moving contact support, so that when the moving contact support moves, it can rotate relative to the connecting part. The connecting part sequentially connects the solid part and the hollow part in the direction from being close to the moving contact support to being far from the moving contact support. When the moving contact support drives the moving contact to be disconnected from the static contact assembly, the connecting part follows the movement of the moving contact support and rotates relative to the moving contact support at the same time, so that the arc extinguishing following structure deflects, and the solid part moves between the moving contact and the static contact assembly to cut off the arc between the moving contact and the static contact assembly.

[0009] In a possible design, a limiting post is further arranged on the moving contact support, the limiting post is located on the side of the connecting part relative to the static contact assembly, and the limiting post is used to follow the movement of the moving contact support when the moving contact is disconnected from the static contact assembly to push the arc extinguishing following structure to the first state.

[0010] Through the above solution, when the moving contact support moves, the arc extinguishing following structure will follow the movement of the moving contact support. At the same time, the arc extinguishing following structure will rotate relative to the moving contact support under the action of its own gravity. At this time, the solid part in the arc extinguishing following structure will move towards the arc direction. Since the limiting post is fixed on the moving contact support, when the moving contact support moves, the connecting part and the moving contact support rotate relative to each other until they abut against the limiting post. The limiting post can resist the connecting part, so that the solid part just stays between the moving contact and the static contact assembly, avoiding excessive rotation of the connecting part relative to the moving contact support, resulting in deviation and causing the problem that it cannot just stay between the moving contact and the static contact assembly, so as to achieve the effect of the limiting post effectively restricting the position of the solid part.

[0011] In a possible design, the arc extinguishing following structure further includes an arc separating grid plate fixed on the side of the hollow part away from the solid part. The arc separating grid plate has a plurality of spaced isolation grids, and the isolation grids are arranged in the same direction.

[0012] With the above solution, after the arc is generated, it will move downward relative to the moving contact. During the downward movement, it will be intercepted by the arc isolation grid. Moreover, since there are multiple isolation grids arranged at intervals on the arc isolation grid, the multiple isolation grids can cut the downward-moving arc into multiple short segments, thereby reducing the possibility of arc reignition and further eliminating the arc.

[0013] In a possible design, the arc isolation grid is arranged on the side of the hollow part facing the moving contact, and the plane where the arc isolation grid is located forms an angle with the plane where the hollow part is located.

[0014] With the above solution, since the solid part has cut the arc between the moving contact and the static contact assembly into two segments, one segment of the arc is between the static contact assembly and the solid part, and the other segment of the arc is between the solid part and the moving contact. Moreover, the arc appears on the path where the moving contact moves away from the static contact assembly. Therefore, the arc column between the solid part and the moving contact is longer and the possibility of reignition is relatively high. Therefore, the arc isolation grid only needs to be arranged on the side of the hollow part facing the moving contact, which can further cut the longer segment of the arc into multiple short segments and completely eliminate the possibility of arc reignition. Designing the arc isolation grid only on one side of the hollow part is also beneficial to saving space and reducing material costs.

[0015] In a possible design, the static contact assembly includes a static contact and a static contact connecting piece. The static contact is fixed to the switch housing through the static contact connecting piece; the area of the solid part facing the static contact side is larger than the surface area of the static contact, and / or the area of the solid part facing the moving contact side is larger than the surface area of the moving contact.

[0016] With the above solution, when the moving contact and the static contact assembly are disconnected, actually the moving contact and the static contact are disconnected. When the moving contact and the static contact are separated, the moving contact moves away from the static contact. An arc is generated between the moving contact and the static contact on the path of separation. When the area of the solid part facing the static contact side is larger than the surface area of the static contact, that is, the area of the solid part facing the static contact side is larger than the cross-sectional area of the arc, thus ensuring the cutting of the arc towards the static contact side and achieving the arc extinguishing effect; in addition, the area of the solid part facing the moving contact side is larger than the surface area of the moving contact, that is, the area of the solid part facing the moving contact side is larger than the cross-sectional area of the arc, thus cutting the cross-section of the arc towards the moving contact side and achieving the arc extinguishing effect.

[0017] In a possible design, the hollow part is a hollow hole. Among them, the area of the hollow hole is larger than the surface area of the static contact or the moving contact, so that the moving contact can pass through the hollow hole to close with the static contact, or the static contact can pass through the hollow hole to close with the moving contact.

[0018] With the above solution, when the moving contact and the static contact assembly are closed, in fact, the moving contact and the static contact come into contact to close. When the moving contact and the static contact are in contact, the hollowed-out part is a hollow hole to ensure that there is no blockage between the moving contact and the static contact. The area of the hollow hole can be larger than the surface area of the static contact so that the static contact can pass through the hollow hole to ensure that the static contact can contact the moving contact. The area of the hollow hole can also be larger than the surface area of the moving contact so that the moving contact can pass through the hollow hole to ensure that the moving contact can contact the static contact.

[0019] In a possible design, it further includes an arc extinguishing chamber and at least one magnetic blowing piece; the magnetic blowing piece is used to introduce the conductive particles generated when the moving contact and the static contact assembly are disconnected into the arc extinguishing chamber.

[0020] With the above solution, after the arc is cut or cut into multiple segments, there may still be free conductive particles everywhere. An arc extinguishing chamber and at least one magnetic blowing piece are provided in the switch arc extinguishing structure. The magnetic blowing piece can generate a magnetic field, and the acting force of the magnetic field on the current introduces the conductive particles into the arc extinguishing chamber to achieve the effect of complete arc extinguishing.

[0021] In a possible design, it further includes at least one air blowing piece and an arc extinguishing chamber; the air blowing piece is used to introduce the conductive particles generated when the moving contact and the static contact assembly are disconnected into the arc extinguishing chamber.

[0022] With the above solution, after the arc is cut or cut into multiple segments, there may still be free conductive particles everywhere. An arc extinguishing chamber and at least one air blowing piece are provided in the switch arc extinguishing structure. The air blowing piece generates gas, which can blow the arc longitudinally or transversely, so that the arc cools and elongates in the airflow leading to the arc extinguishing chamber, causing strong deionization to achieve the effect of complete arc extinguishing.

[0023] In a second aspect, the present application provides an arc extinguishing circuit breaker, including the switch arc extinguishing structure in the first aspect.

[0024] For what is provided in the above second aspect and each possible design of the second aspect, the beneficial effects can refer to the beneficial effects brought by the above first aspect and each possible implementation manner of the first aspect, which will not be elaborated here.

[0025] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to be able to more clearly understand the technical means of the embodiments of the present application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and understandable, the following specifically illustrates the specific implementation manners of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 Schematic diagram of the arc extinguishing following structure provided by an embodiment of the present application.

[0028] Figure 2 Schematic diagram of the moving contact support provided by an embodiment of the present application.

[0029] Figure 3 Schematic diagram of the first state of the switch arc extinguishing structure provided by an embodiment of the present application.

[0030] Figure 4 Schematic diagram of the second state of the switch arc extinguishing structure provided by an embodiment of the present application.

[0031] Figure 5 Schematic diagram of the arc extinguishing of the arc separating grid in the switch arc extinguishing structure provided by an embodiment of the present application.

[0032] Explanation of reference numerals: 100, switch housing; 110, static contact assembly; 120, moving contact assembly; 121, moving contact link; 200, moving contact support; 210, second rotating shaft; 220, limit post; 300, rotating body; 311, first rotating shaft; 310, torsion spring structure; 400, arc extinguishing following structure; 410, connecting portion; 420, solid portion; 430, hollow portion; 440, arc separating grid; 500, arc. Detailed implementation manners

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0034] 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 description of the embodiments of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the drawings are intended to cover non-exclusive inclusion.

[0035] As used herein, the term "embodiment" means that the specific features, structures, or characteristics described in connection with an embodiment may be included in at least one embodiment of the present application. The phrase "embodiment" appearing in various positions in the specification does not necessarily refer 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 may be combined with other embodiments.

[0036] The term "and / or" in this document is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: the existence of A, the simultaneous existence of A and B, and the existence of B. Additionally, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0037] The directional terms appearing in the following description are the directions shown in the figures and do not limit the specific structure of the switching arc extinguishing structure of the present application. For example, in the description of the present application, terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 the present 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 should not be construed as a limitation of the present application.

[0038] Furthermore, the terms "first", "second", etc. in the description of the present application and the claims or the above-mentioned drawings are used to distinguish different objects and not to describe a specific order, and may explicitly or implicitly include one or more of such features.

[0039] In the description of the present application, unless otherwise specified, "a plurality of" means two or more (including two). Similarly, "a plurality of groups" means two or more groups (including two groups).

[0040] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, the "connection" or "coupling" of mechanical structures may refer to a physical connection. For example, a physical connection may be a fixed connection, such as a fixed connection through a spacer, such as a fixed connection through screws, bolts, or other spacers; a physical connection may also be a detachable connection, such as a snap connection or a snap-fit connection; a physical connection may also be an integral connection, such as a connection formed by welding, bonding, or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. The "connection" or "coupling" of circuit structures may refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it may be a direct connection, that is, a physical connection, or it may be indirectly connected through at least one intermediate element, as long as the circuit is electrically connected, and it may also be the internal connection of two elements; a signal connection may refer not only to a signal connection through a circuit but also to a signal connection through a media medium, such as radio waves. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] As a switch, an arc extinguishing circuit breaker can quickly cut off the power supply circuit when the leakage current in the power supply circuit exceeds a predetermined value to avoid dangerous situations such as electric shock to the human body and equipment leakage. The on-off and conversion of the circuit are realized through the execution component contact system in the switch of the electrical circuit, mainly through its contacts and arc extinguishing device. The contact system mainly includes a static contact and a moving contact. The process of the static contact and the moving contact being connected and disconnected is accompanied by a gas discharge phenomenon, that is, an arc is generated.

[0042] An arc is an instantaneous spark phenomenon generated when the electric field is too strong and the gas undergoes electrical breakdown to continuously form conductive particles, enabling the current to pass through an insulating medium (such as air) under normal conditions. When the contacts of the switch are separated to cut off the power circuit, an arc is generated between the contacts. When an arc exists, not only is the circuit not cut off, but the high temperature of the arc can melt or burn the surface of the contacts. Therefore, arc extinguishing measures need to be taken in various switches.

[0043] In the related art, a gas generating piece is used to generate gas, and the gas blows the arc into the arc extinguishing chamber to extinguish the arc. However, this form of arc extinguishing cannot ensure effective separation of the static and moving contacts in a short time, resulting in ablation of the contact points of the contacts.

[0044] In view of this, an arc extinguishing structure for a switch and an arc extinguishing circuit breaker are provided in an embodiment of the present application. An arc extinguishing following structure is provided, and the arc extinguishing following structure has a solid part and a hollow part. The positions of the solid part and the hollow part are switched according to the operating state supported by the moving contact. The arc extinguishing following structure can move closely following the operating state supported by the moving contact to achieve the purpose of quickly extinguishing the arc when the arc is generated.

[0045] In order to enable those skilled in the art to better understand the solution of 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.

[0046] Figure 1 It is a schematic diagram of the arc extinguishing following structure provided in this embodiment. Figure 2 It is a schematic diagram of the moving contact support provided in this embodiment. Figure 3 It is a schematic diagram of the first state of the arc extinguishing structure for a switch provided in this embodiment. Figure 4 It is a schematic diagram of the second state of the arc extinguishing structure for a switch provided in this embodiment. Please refer to Figures 1 to 4 The present application provides an arc extinguishing structure for a switch, including: a switch housing 100, a contact system, and an arc extinguishing following structure 400.

[0047] The switch housing 100 is a support structure of the circuit breaker and is used to accommodate each component in the arc extinguishing structure for a switch. The switch housing 100 can be a gas-producing material, for example, it can be a gas-producing arc extinguishing nylon material.

[0048] The contact system is fixed inside the switch housing 100. The contact system includes a static contact assembly 110 and a moving contact assembly 120. Among them, the static contact assembly 110 includes a static contact and a static contact connecting member, and the static contact is fixed on the switch housing 100 through the static contact connecting member. The moving contact assembly 120 includes a moving contact, a moving contact support 200, and a rotating mechanism. The moving contact is fixed on the moving contact support 200, and the moving contact support 200 is fixed on the switch housing 100 through the rotating mechanism. The rotating mechanism drives the moving contact support 200 to operate under the action of an external force to realize the disconnection and closing of the moving contact and the static contact assembly 110.

[0049] In this embodiment, the rotating mechanism includes a rotating body 300, a first rotating shaft 311, and a torsion spring structure 310. The moving contact is fixed on the moving contact support 200 through a moving contact link 121. The first rotating shaft 311 is fixed on the switch housing 100. The torsion spring structure 310 is sleeved on the first rotating shaft 311. One end of the torsion spring structure 310 abuts against the rotating body 300, and the other end abuts against the moving contact link 121 to fix the moving contact support 200 on the rotating body 300. When the rotating body 300 is driven to move around the first rotating shaft 311, the moving contact support 200 rotates around the first rotating shaft 311 following the rotating body 300. The rotation of the moving contact support 200 drives the moving contact link 121 to move, thereby driving the moving contact to move relative to the static contact to form an open or closed state. The two ends of the torsion spring structure 310 respectively abut against the rotating body 300 and the moving contact link 121, generating a pre-pressure on the moving contact link 121, which can prevent the moving contact from rebounding after contacting the static contact, making the contact between the moving contact and the static contact more stable when closed.

[0050] The arc extinguishing following structure 400 is fixed on the moving contact support 200. The arc extinguishing following structure 400 includes a hollow part 430 and a solid part 420. The arc extinguishing following structure 400 has a first state and a second state following the operating state of the moving contact support 200. When the moving contact is disconnected from the static contact assembly 110, the arc extinguishing following structure 400 is in the first state. When the moving contact is closed with the static contact assembly 110, the arc extinguishing following structure 400 is in the second state. In the first state, the solid part 420 is located between the moving contact and the static contact; in the second state, the hollow part 430 is located between the moving contact and the static contact.

[0051] In this embodiment, when the moving contact is instantaneously disconnected from the static contact assembly 110, the arc extinguishing following structure 400 can move closely following the operating state of the moving contact support 200, so that the solid part 420 is located between the moving contact and the static contact assembly 110 to cut off the generated arc 500, thereby quickly isolating the arc 500 between the moving contact and the static contact assembly 110 and protecting the moving contact or the static contact assembly 110 from being ablated.

[0052] In this embodiment, the arc extinguishing following structure 400 further includes a connecting part 410. The connecting part 410 is rotatably connected to the moving contact support 200. Specifically, a second rotating shaft 210 is provided on the moving contact support 200. The second rotating shaft 210 is parallel to the first rotating shaft 311. One end of the connecting part 410 is rotatably fixed on the second rotating shaft 210, and the other end of the connecting part 410 is connected to the solid part 420. When the moving contact support 200 rotates, the moving contact support 200 can rotate relative to the connecting part 410.

[0053] The connecting part 410 is sequentially connected to the solid part 420 and the hollow part 430 in the direction from near the moving contact support 200 to far from the moving contact support 200. The arc extinguishing following structure 400 rotates following the movement of the moving contact support 200. When the moving contact support 200 drives the moving contact to disconnect from the static contact assembly 110, the arc extinguishing following structure 400 rotates relative to the moving contact support 200, so that the solid part 420 moves between the moving contact and the static contact assembly 110. When the moving contact support 200 drives the moving contact to disconnect from the static contact assembly 110, the moving contact support 200 will also drive the connecting part 410 to move at the same time. At this time, the connecting part 410 rotates relative to the moving contact support 200, so that the solid part 420 will move and rotate to between the moving contact and the static contact assembly 110, realizing the cutting of the arc between the moving contact and the static contact assembly 110. The effect of cutting off the arc is achieved instantly when the arc is generated, thereby avoiding the ablation of the moving contact and the static contact.

[0054] In this embodiment, when the moving contact support 200 moves, the arc extinguishing following structure 400 will move following the moving contact support 200. At the same time, the arc extinguishing following structure 400 will rotate relative to the moving contact support 200 due to its own gravity. At this time, the solid part 420 in the arc extinguishing following structure 400 will move towards the arc direction until it moves between the moving contact and the static contact and cuts off the arc.

[0055] A limiting post 220 is further arranged on the moving contact support 200. The limiting post 220 is located on the side of the connecting part 410 relative to the static contact assembly 110. The limiting post 220 is used to follow the movement of the moving contact support 200 when the moving contact disconnects from the static contact assembly 110, so as to push the arc extinguishing following structure 400 to the first state.

[0056] The limiting post 220 is fixed on the moving contact support 200. When the moving contact support 200 moves, the connecting part 410 rotates relative to the moving contact support 200 until it abuts against the limiting post 220. The limiting post 220 can resist the connecting part 410, so that the solid part 420 just stays between the moving contact and the static contact assembly 110, avoiding the problem that the connecting part 410 rotates too much relative to the moving contact support 200 and causes deviation, resulting in the inability to just stay between the moving contact and the static contact assembly 110, so as to achieve the effect of the limiting post 220 effectively limiting the position of the solid part 420.

[0057] Figure 5 It is a schematic diagram of arc extinguishing of the arc separating grid piece 440 in the switch arc extinguishing structure provided in this embodiment. Please refer to Figure 1 and Figure 5 . The arc extinguishing following structure 400 further includes an arc separating grid piece 440 fixed on the side of the hollow part 430 away from the solid part 420. The arc separating grid piece 440 has a plurality of isolation grids arranged at intervals, and the isolation grids are arranged in the same direction.

[0058] It can be seen that after the arc 500 is generated, it will move away from the moving contact support relative to the moving contact. Since the arc isolation grid 440 is provided on the side of the hollow portion 430 of the arc extinguishing following structure 400 away from the solid portion 420, the arc 500 will be intercepted by the arc isolation grid 440 during the process of moving away from the moving contact support. Moreover, since there are multiple isolation grids arranged at intervals on the arc isolation grid 440, the multiple isolation grids can cut the downward-moving arc 500 into multiple short segments, thereby reducing the possibility of the arc 500 reigniting and further extinguishing the arc 500.

[0059] The isolation grids are arranged in the same direction. The same direction can be the direction from the side where the moving contact is located to the side where the static contact is located. Usually, the direction in which the arc is elongated is the arc-shaped connection line between the moving contact and the static contact. And during the elongation of the arc, the middle part of the arc extends in the direction away from the moving contact support. When the middle part of the arc 500 extends in the direction away from the moving contact support and encounters multiple isolation grids arranged at intervals, the isolation grids divide the arc 500 into multiple short segments, thereby being able to better reduce the possibility of the arc 500 reigniting.

[0060] In this embodiment, the arc isolation grid 440 is arranged on the side of the hollow portion 430 facing the moving contact, and the plane where the arc isolation grid 440 is located forms an angle with the plane where the hollow portion 430 is located.

[0061] Since the solid portion 420 has already cut the arc 500 between the moving contact and the static contact assembly 110 into two segments, one segment of the arc is between the static contact assembly 110 and the solid portion 420, and the other segment of the arc is between the solid portion 420 and the moving contact. And the arc appears on the path where the moving contact moves away from the static contact assembly 110. Therefore, the arc between the solid portion 420 and the moving contact is longer and the possibility of reigniting is relatively high. Therefore, the arc isolation grid 440 only needs to be arranged on the side of the hollow portion 430 facing the moving contact, which can further cut the longer segment of the arc into multiple short segments and completely eliminate the possibility of the arc reigniting. Designing the arc isolation grid 440 only on one side of the hollow portion 430 is also beneficial to saving space and reducing the manufacturing cost of the arc isolation grid 440.

[0062] In some embodiments, the arc isolation grid 440 is arranged on the side of the hollow portion 430 facing the static contact, and the plane where the arc isolation grid 440 is located forms an angle with the plane where the hollow portion 430 is located. During the process of the middle part of the arc 500 between the static contact assembly 110 and the solid portion 420 extending in the direction away from the moving contact support, it can be intercepted by the arc isolation grid 440 to achieve the arc extinguishing effect.

[0063] In this embodiment, the area of the solid portion 420 facing the static contact side is larger than the surface area of the static contact, and / or the area of the solid portion 420 facing the moving contact side is larger than the surface area of the moving contact.

[0064] When the moving contact disconnects from the static contact assembly 110, it is actually the moving contact and the static contact that disconnect. When the moving contact and the static contact separate, the moving contact moves away from the static contact, and an arc 500 is generated between the moving contact and the static contact on the path of separation. When the area of the solid part 420 facing the static contact side is larger than the surface area of the static contact, that is, the area of the solid part 420 facing the static contact side is larger than the cross-sectional area of the arc 500, the arc 500 facing the static contact side can be guaranteed to be cut off, achieving the arc extinguishing effect; in addition, the area of the solid part 420 facing the moving contact side is larger than the surface area of the moving contact, that is, the area of the solid part 420 facing the moving contact side is larger than the cross-sectional area of the arc 500, so that the cross-section of the arc 500 facing the moving contact side can be cut off, achieving the arc extinguishing effect.

[0065] The shape of the solid part 420 can be square or circular. As long as the arc 500 can be cut off and blocked between the moving contact and the static contact, the arc extinguishing effect can be achieved. In this embodiment, the solid part 420 is square. During the process of cutting off the arc 500, the sides of the square are straight lines, and the straight lines can achieve faster cutting of the cross-section of the arc 500.

[0066] In this embodiment, the hollow part 430 is a hollow hole. Among them, the area of the hollow hole is larger than the surface area of the static contact or the moving contact, so that the moving contact can pass through the hollow hole to close with the static contact, or the static contact can pass through the hollow hole to close with the moving contact.

[0067] When the moving contact closes with the static contact assembly 110, it is actually the moving contact and the static contact that come into contact to close. When the moving contact and the static contact come into contact, the hollow part 430 is a hollow hole to ensure that there is no block between the moving contact and the static contact. The area of the hollow hole can be larger than the surface area of the static contact, so that the static contact can pass through the hollow hole to ensure that the static contact can contact the moving contact. The area of the hollow hole can also be larger than the surface area of the moving contact, so that the moving contact can pass through the hollow hole to ensure that the moving contact can contact the static contact.

[0068] The shape of the hollow hole can be square or circular, as long as the moving contact or the static contact can pass through. In this embodiment, the hollow hole is square, which is convenient for connecting with the solid part 420 to form a unified whole.

[0069] In some embodiments, the arc extinguishing structure of the switch further includes an arc extinguishing chamber and at least one magnetic blowing piece. The magnetic blowing piece is used to introduce the conductive particles generated when the moving contact disconnects from the static contact assembly 110 into the arc extinguishing chamber.

[0070] Through the above solution, after the arc is cut or cut into multiple segments, there may still be free conductive particles everywhere. An arc extinguishing chamber and at least one magnetic blowout piece are provided in the switch arc extinguishing structure. The magnetic blowout piece can generate a magnetic field, and the magnetic field generates a force on the current, so that the conductive particles are introduced into the arc extinguishing chamber, and the arc is cooled and elongated in the air flow leading to the arc extinguishing chamber, so as to achieve the effect of completely extinguishing the arc. Multiple magnetic blowout pieces can generate a greater electromagnetic force, thereby enhancing the magnetic field intensity, promoting the arc column to move and elongate at a faster speed. The movement and elongation of the arc contribute to the cooling and deionization of the arc column, and finally the effect of quickly and completely extinguishing the arc can be achieved.

[0071] In some embodiments, the switch arc extinguishing structure may further include at least one air blowout piece and an arc extinguishing chamber; the air blowout piece is used to introduce the conductive particles generated when the moving contact is disconnected from the static contact assembly 110 into the arc extinguishing chamber.

[0072] After the arc is cut or cut into multiple segments, there may still be free conductive particles everywhere. An arc extinguishing chamber and at least one air blowout piece are provided in the switch arc extinguishing structure. The air blowout piece generates gas, which can blow the arc longitudinally or transversely, so that the arc is cooled and elongated in the air flow leading to the arc extinguishing chamber, so as to achieve the effect of completely extinguishing the arc.

[0073] Therefore, through the arc extinguishing following structure 400 in this embodiment, the arc can be quickly cut, so that the arc can be separated by the solid part 420 at the moment of generation. The two arcs contact on the solid part 420 and can be quickly cooled by the solid part 420. At the same time, the solid part 420 prevents the space between the static contact and the moving contact from being continuously filled with new high-voltage arc gas, avoiding melting or burning of the contact surface.

[0074] The embodiment of the present application also provides an arc extinguishing circuit breaker, and the circuit breaker includes any one of the above-mentioned switch arc extinguishing structures. Since the switch arc extinguishing structure and its beneficial effects have been described in detail in the previous embodiments, the present application will not be elaborated here.

[0075] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A switch arc extinguishing structure, characterized in that, Comprising: Switch housing; Contact system, the contact system comprising a stationary contact assembly and a moving contact assembly; the stationary contact assembly is fixed within the switch housing, the moving contact assembly includes a moving contact, a moving contact support, and a rotating mechanism, the moving contact is fixed to the moving contact support, the moving contact support is fixed to the switch housing through the rotating mechanism, and the rotating mechanism drives the moving contact support to operate under an external force to achieve disconnection and closing of the moving contact and the stationary contact assembly; Arc extinguishing follow-up structure, fixed to the moving contact support, the arc extinguishing follow-up structure comprising a hollow portion and a solid portion, the arc extinguishing follow-up structure having a first state and a second state following the operating state of the moving contact support, when the moving contact and the stationary contact assembly are disconnected, the arc extinguishing follow-up structure is in the first state; when the moving contact and the stationary contact assembly are closed, the arc extinguishing follow-up structure is in the second state; in the first state, the solid portion is located between the moving contact and the stationary contact assembly; in the second state, the hollow portion is located between the moving contact and the stationary contact assembly.

2. The arc extinguishing structure of the switch according to claim 1, wherein The arc extinguishing follow-up structure further includes a connecting portion, the connecting portion is rotatably connected to the moving contact support, and the connecting portion connects the solid portion and the hollow portion in sequence from a direction close to the moving contact support to a direction away from the moving contact support; the arc extinguishing follow-up structure rotates following the operation of the moving contact support; When the moving contact support drives the moving contact to disconnect from the stationary contact assembly, the arc extinguishing follow-up structure rotates relative to the moving contact support, so that the solid portion moves between the moving contact and the stationary contact assembly.

3. The arc extinguishing structure of the switch according to claim 2, characterized in that, A limiting post is further provided on the moving contact support, the limiting post is located on a side of the connecting portion relative to the stationary contact assembly, and the limiting post is used to follow the operation of the moving contact support when the moving contact and the stationary contact assembly are disconnected, so as to push the arc extinguishing follow-up structure to the first state.

4. The arc extinguishing structure of the switch according to claim 3, characterized in that, The arc extinguishing follow-up structure further includes an arc separating grid plate fixed to a side of the hollow portion away from the solid portion, and the arc separating grid plate has a plurality of spaced apart isolation grids, and the isolation grids are arranged in the same direction.

5. The arc extinguishing structure of the switch according to claim 4, characterized in that, The arc separating grid plate is disposed on a side of the hollow portion facing the moving contact, and a plane where the arc separating grid plate is located forms an angle with a plane where the hollow portion is located.

6. The arc extinguishing structure of the switch according to claim 1, characterized in that The stationary contact assembly includes a stationary contact and a stationary contact connecting member, the stationary contact is fixed to the switch housing through the stationary contact connecting member; an area of a side of the solid portion facing the stationary contact is larger than a surface area of the stationary contact, and / or an area of a side of the solid portion facing the moving contact is larger than a surface area of the moving contact.

7. The arc extinguishing structure of the switch according to claim 6, characterized in that, The hollow portion is a hollow hole, wherein an area of the hollow hole is larger than a surface area of the stationary contact or the moving contact, so that the moving contact can pass through the hollow hole to close with the stationary contact, or the stationary contact can pass through the hollow hole to close with the moving contact.

8. The arc extinguishing structure of the switch according to claim 1, characterized in that, It further includes at least one magnetic blowout piece and an arc extinguishing chamber; the magnetic blowout piece is used for introducing conductive particles generated when the moving contact is disconnected from the static contact assembly into the arc extinguishing chamber.

9. The arc extinguishing structure of the switch according to claim 1, characterized in that, It further includes at least one air blowout piece and an arc extinguishing chamber; the air blowout piece is used for introducing conductive particles generated when the moving contact is disconnected from the static contact assembly into the arc extinguishing chamber.

10. An arc extinguishing circuit breaker, characterized in that, It includes the switch arc extinguishing structure according to any one of claims 1 to 9.

Images