Electromagnetic system and a snap circuit breaker
By optimizing the connection between the armature and the yoke in the electromagnetic system, reducing the air gap, and using hole-shaft fit and elastic element reset, the problem of slow response speed of the electromagnetic system was solved, resulting in a faster tripping rate and higher reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DELIXI ELECTRIC
- Filing Date
- 2025-07-07
- Publication Date
- 2026-06-26
AI Technical Summary
In existing technologies, the electromagnetic system has a slow response speed, resulting in a low tripping rate for snap-action circuit breakers.
By placing the connecting parts on both sides of the armature in the electromagnetic system, the air gap between the armature and the yoke is reduced. The rotational connection between the armature and the yoke is achieved by using a hole-shaft fit and a tight fit of the rotating shaft, and the armature is reset by using an elastic element, thereby improving the armature's attraction speed and reliability.
It enhances the response speed of the electromagnetic system, improves the tripping rate and reliability of the snap-action circuit breaker, and reduces manufacturing and maintenance costs.
Smart Images
Figure CN224417730U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electrical equipment technology, and in particular to an electromagnetic system and a snap-action circuit breaker. Background Technology
[0002] A snap-action circuit breaker is a type of circuit breaker, belonging to the category of low-voltage electrical appliances. It is mainly used for circuit switching control and overload and short-circuit protection. The name "snap-action circuit breaker" comes from the "snap-action" operating principle of its core operating component, which uses electromagnetic force to drive the moving contact and stationary contact to quickly close or separate, thereby connecting or disconnecting the circuit.
[0003] The electromagnetic system is a crucial component of a snap-action circuit breaker, typically comprising a yoke and an armature. The electromagnetic system usually operates in two states: engaged and disengaged. Through the switching between these two states, the snap-action circuit breaker can achieve circuit protection and control functions. However, current technology suffers from a slow engagement response speed of the electromagnetic system, resulting in a low tripping rate for the snap-action circuit breaker. Utility Model Content
[0004] This application provides an electromagnetic system and a snap-action circuit breaker to improve the response speed of the electromagnetic system, thereby improving the tripping rate of the snap-action circuit breaker.
[0005] In a first aspect, this application provides an electromagnetic system comprising a yoke and an armature. The yoke includes a first side plate, a connecting plate, and a second side plate, which are sequentially connected to form a U-shaped structure. The sidewalls of the first and second side plates away from the connecting plate form a first air gap surface. The armature includes a body portion and two connecting portions. The body portion is located on one side of the first air gap surface, and the two connecting portions are connected to a first end of the body portion. One connecting portion is rotatably connected to the outside of the first side plate, and the other connecting portion is rotatably connected to the outside of the second side plate. The body portion includes a second air gap surface facing the connecting plate. When the electromagnetic system is in a released state, the distance between the portion of the second air gap surface near the first end and the first air gap surface approaches zero. When the armature rotates relative to the yoke until the second air gap surface and the first air gap surface are attracted, the electromagnetic system is engaged.
[0006] Compared to the existing technology where the connecting part is connected to one end of the main body, the two connecting parts in this application are located on both sides of the main body. This eliminates the gap between the connecting parts and the main body, allowing the main body to be positioned closer to the yoke when the armature is mounted on it. When the main body is positioned closer to the yoke, the distance between the first end of the main body and the first air gap surface approaches zero, reducing the air gap between the armature and the yoke. A smaller air gap reduces magnetic resistance, leading to a greater electromagnetic attraction force from the yoke. This better attracts the armature, making its action more sensitive and its response faster, thereby improving the tripping rate of the snap-action circuit breaker.
[0007] In one possible design, the connecting part is integrally formed with the main body, and the connecting part is connected to the main body by bending. The connecting part includes a first connecting part and a second connecting part. The first connecting part has a first sidewall, and the second connecting part has a second sidewall. The first sidewall faces the second connecting part, and the second sidewall faces the first connecting part. The angle between the second air gap surface and the first sidewall is 90°, and the angle between the second air gap surface and the second sidewall is 90°.
[0008] The above solution uses bending to integrally form the connecting part and the main body, simplifying the operation and reducing the manufacturing cost of the armature. The angle between the second air gap surface and the first sidewall is 90°. Simultaneously, the angle between the second air gap surface and the second sidewall is also 90°. This reduces the problem of incomplete engagement between the first and second air gap surfaces when the connection angle between the second air gap surface and the first sidewall is an arc angle, thereby improving the reliability of the electromagnetic system.
[0009] In one possible design, both the first and second side plates have a first through hole at the end near the connecting portion, and both connecting portions have a second through hole, with the second through holes positioned opposite to the first through holes. The electromagnetic system also includes a rotating shaft that passes through the two first through holes and the two second through holes.
[0010] In the above scheme, the magnetic yoke is provided with a first through hole, and the connecting part is provided with a second through hole. The first and second through holes are positioned correspondingly. When the rotating shaft passes through the two first and two second through holes, the armature can be rotatably connected to the magnetic yoke. This hole-shaft mating method achieves a rotatable connection between the armature and the magnetic yoke. While ensuring mechanical performance, the hole-shaft mating assembly method is more flexible, has lower manufacturing costs, and also reduces the cost of subsequent maintenance and replacement.
[0011] In one possible design, both the openings of the first through hole and the second through hole are chamfered.
[0012] By using the above solution, chamfers are set at the openings of the first and second through holes. This not only provides guidance for the shaft during installation, but also removes the sharp edges of the first and second through holes, making them smoother. This increases the safety of the installers during the shaft installation process.
[0013] In one possible design, at least one end of the shaft is tightly fitted with the first through hole.
[0014] With the above scheme, at least one end of the rotating shaft is tightly fitted with the first through hole, which fixes the rotating shaft to the magnetic yoke. When the armature is installed on the magnetic yoke, the first side plate and the second side plate are located between the two rotating parts, and one rotating part is in contact with the first side plate, while the other rotating part is in contact with the second side plate. In this way, the armature will not move along the arrangement direction of the first and second side plates. At this time, the rotating shaft is inserted into the first and second through holes and tightly fitted with the first through hole. Thus, the relative positions of the armature, the magnetic yoke, and the rotating shaft are fixed, preventing the armature from falling off the rotating shaft and the rotating shaft from falling off the magnetic yoke, reducing the possibility of disintegration of the electromagnetic system during use. The above arrangement can improve the reliability of the electromagnetic system.
[0015] In one possible design, the electromagnetic system includes an elastic element located on the side of the body facing away from the yoke. A first end of the elastic element is fixed, and a second end is connected to the armature. During the transition from the initial attraction between the first and second air gap surfaces to the maximum distance between them, the elastic element enables the armature to return to its original position.
[0016] Through the above scheme, when the electromagnetic system transitions from the engaged state to the released state, the force of the elastic element during its recovery deformation allows it to reset the armature. This reduces the likelihood of the snap-action circuit breaker failing to trip during subsequent use due to the armature not resetting. The elastic element improves the reliability of the electromagnetic system, thereby enhancing the reliability of the snap-action circuit breaker.
[0017] In one possible design, the magnetic yoke has a first connecting rod, and the end of the main body away from the connecting part has a second connecting rod. The first end is connected to the first connecting rod to fix the position of the first end, and the second end of the elastic member is connected to the second connecting rod.
[0018] With the above scheme, the first connecting rod is mounted on the magnetic yoke, which remains stationary. When the first end of the elastic element is connected to the first connecting rod, the first end of the elastic element also remains stationary. The armature rotates around a pivot point located on the connecting part. The second connecting rod is located at the end of the main body furthest from the connecting part. When the electromagnetic system is in the attracted state, the elastic element can be stretched further, resulting in a stronger force generated when the elastic element recovers its deformation, and making the armature's reset process more reliable.
[0019] In one possible design, the first link has an extension that extends away from the second link.
[0020] With the above solution, during the process of the electromagnetic system changing from the attracted state to the released state, the elastic element will generate a force by restoring its deformation. This force will cause the elastic element to move away from the second link. Since the first end of the elastic element is connected to the first link, and an extension section is provided on the first link, and the extension section extends away from the second link, the possibility of the first end of the elastic element falling off the first link can be reduced, thus improving the reliability of the electromagnetic system.
[0021] In one possible design, a contact plate is also included, which is partially disposed within the magnetic yoke. The connecting plate has a protruding structure on the side facing the armature, and a fixing hole is provided on the contact plate opposite the protruding structure. The protruding structure and the fixing hole cooperate to fix the contact plate and the magnetic yoke in a fixed connection.
[0022] Through the above scheme, the contact plate can be used as a conductive component in an electromagnetic system. The connecting plate has a raised structure, and the contact plate has fixing holes. The raised structure and fixing holes cooperate to securely connect the contact plate to the magnetic yoke, reducing the possibility of the contact plate falling out of the yoke. When the contact plate is connected to the magnetic yoke, it fits snugly against the yoke, allowing for a larger contact area and thus making the installation more stable. The plate shape of the contact plate allows for a larger area through which current flows, reducing energy loss and improving conductivity.
[0023] Secondly, this application provides a snap-action circuit breaker, which includes a housing and the electromagnetic system mentioned in the first aspect. The housing has a receiving cavity. The electromagnetic system is disposed within the receiving cavity. A blocking member is provided within the receiving cavity, which can limit the armature.
[0024] The beneficial effects of the snap-action circuit breaker provided in the second aspect above can be found in the first aspect and the beneficial effects of various possible embodiments of the first aspect, and will not be repeated here. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the internal structure of the snap-action circuit breaker provided in an embodiment of this application.
[0026] Figure 2 A schematic diagram of the electromagnetic system provided in an embodiment of this application.
[0027] Figure 3 This is a schematic diagram of the structure of the magnetic yoke provided in an embodiment of this application.
[0028] Figure 4 This is a schematic diagram of the armature structure provided in an embodiment of this application from one perspective.
[0029] Figure 5 This is a schematic diagram of the armature provided in an embodiment of this application from another perspective.
[0030] Figure 6 This is a schematic diagram of another configuration of the electromagnetic system provided in an embodiment of this application.
[0031] Explanation of reference numerals in the attached figures:
[0032] 100, Magnetic yoke; 110, First air gap surface; 120, First side plate; 130, Second side plate; 140, Connecting plate; 150, First through hole;
[0033] 200, armature; 210, connecting part; 211, second through hole; 212, first side wall; 213, second side wall; 220, body part; 230, second air gap surface;
[0034] 300. Shaft;
[0035] 400. Reset structure; 410. First connecting rod; 411. Extension section; 420. Second connecting rod; 430. Elastic element;
[0036] 500. Contact plate;
[0037] 600. Shell. Detailed Implementation
[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0040] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and drawings of this application are intended to cover without excluding other meanings. The words "a" or "an" do not exclude the presence of multiples.
[0041] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0042] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0043] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0044] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.
[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by fasteners, such as a connection secured by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0046] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
[0047] Figure 1 This is a schematic diagram of the internal structure of the snap-action circuit breaker provided in an embodiment of this application. Figure 2 A schematic diagram of the electromagnetic system provided in an embodiment of this application. (See attached diagram.) Figure 1 as well as Figure 2 As shown, this application provides a snap-action circuit breaker, which includes a housing 600 and an electromagnetic system. The housing 600 has a receiving cavity. The electromagnetic system is disposed within the receiving cavity. A blocking member is provided within the receiving cavity, which can limit the armature 200.
[0048] A snap-action circuit breaker is a common low-voltage electrical appliance, mainly used for distributing electrical energy and protecting lines and electrical equipment. Snap-action circuit breakers are widely used in factories, hotels, and office buildings due to their compact structure, rapid operation, and high reliability.
[0049] The snap-action circuit breaker primarily operates through an electromagnetic system. Under normal circumstances, the current in the circuit is within the normal range, the electromagnetic system of the snap-action circuit breaker is in the released state, and the circuit remains conductive. At this time, the armature 200 and the yoke 100 are not in contact. When a fault such as a short circuit or overload occurs in the circuit, causing a sharp increase in current, the electromagnetic attraction generated by the electromagnetic system will increase rapidly. A reset structure 400 can be installed within the electromagnetic system. When the electromagnetic attraction reaches a certain level, it will overcome the force of the reset structure 400, causing the armature 200 to move rapidly towards the yoke 100 and engage. During this movement, the armature 200 can push the operating mechanism inside the snap-action circuit breaker to release, thereby opening the switch contacts and cutting off the energized circuit. At this time, the electromagnetic system is in the engaged state.
[0050] After the circuit within the electromagnetic system is broken, no current flows through it, and the electromagnetic attraction generated by the system disappears. Once the electromagnetic attraction disappears, the reset structure 400 can reset the armature 200, restoring the electromagnetic system to its released state. A blocking element can be installed inside the housing 600 of the snap-action circuit breaker. When the reset structure 400 resets the armature 200, the blocking element can limit the armature 200's movement, reducing the risk of excessive rotation of the armature 200 during the reset process, which could affect the normal operation of the subsequent electromagnetic system.
[0051] In existing technology, a groove is often cut near the end of the main body to form a slot, and then the armature located near the end of the slot is bent to form a connecting part. Thus, the position of the slot creates a gap in the alignment direction of the armature between the connecting part and the main body. In this case, when the armature is mounted on the yoke, the position of the gap results in a greater distance between the main body and the yoke, thereby creating a larger air gap between the armature and the yoke.
[0052] Because the magnitude of electromagnetic attraction is inversely proportional to the square of the air gap, a larger air gap results in a smaller magnetic induction intensity, which in turn weakens the electromagnetic attraction. When the electromagnetic attraction weakens, the operating mechanism of the electromagnetic system is obstructed, and the sensitivity of the electromagnetic system decreases.
[0053] To address the aforementioned problems, this application provides an electromagnetic system. 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 with reference to the accompanying drawings.
[0054] Figure 3 This is a schematic diagram of the structure of the magnetic yoke provided in an embodiment of this application. Figure 4 This is a schematic diagram of the armature structure provided in an embodiment of this application from one perspective. Figure 5 This is a schematic diagram of the armature provided in an embodiment of this application from another perspective. (See diagram below.) Figures 2 to 5As shown, this application provides an electromagnetic system including a yoke 100 and an armature 200. The yoke 100 includes a first side plate 120, a connecting plate 140, and a second side plate 130, which are sequentially connected to form a U-shaped structure. The sidewalls of the first side plate 120 and the second side plate 130 away from the connecting plate 140 form a first air gap surface 110. The armature 200 includes a body portion 220 and two connecting portions 210. The body portion 220 is located on one side of the first air gap surface 110, and the two connecting portions 210 are connected to the first end of the body portion 220. One connecting portion 210 is rotatably connected to the outside of the first side plate 120, and the other connecting portion 210 is rotatably connected to the outside of the second side plate 130. The main body 220 includes a second air gap surface 230 facing the connecting plate 140. When the electromagnetic system is in the released state, the distance between the portion of the second air gap surface 230 near the first end and the first air gap surface 110 approaches zero. When the armature 200 rotates relative to the yoke 100 until the second air gap surface 230 and the first air gap surface 110 are attracted, the electromagnetic system is attracted.
[0055] The first side plate 120, the second side plate 130, and the connecting plate 140 can all be plate-shaped structures. The first side plate 120 and the second side plate 130 are arranged opposite to each other and spaced apart, with the connecting plate 140 located between the first side plate 120 and the second side plate 130. In this way, the first side plate 120, the connecting plate 140, and the second side plate 130 can be connected sequentially, allowing the magnetic yoke 100 to form a U-shaped structure.
[0056] In electromagnetic systems, an air gap refers to a region of non-magnetic material, either artificially created or naturally present, within a magnetic circuit. The air gap is typically air, but can also be a vacuum or other insulating medium. It is a crucial component of the magnetic circuit and plays a key regulatory role in the performance of the electromagnetic system. In this application, the air gap can be understood as the air gap between the armature 200 and the yoke 100.
[0057] The sidewalls of the first side plate 120 and the second side plate 130 away from the connecting plate 140 are the first air gap surface 110. That is, the first air gap surface 110 can be the sidewalls of the first side plate 120 and the second side plate 130 facing the main body 220.
[0058] The main body 220 can be in the shape of a long strip plate, and the armature 200 can also be provided with a second air gap surface 230, which can be the side wall of the main body 220 facing the connecting plate 140.
[0059] The two connecting portions 210 can be plate-like structures provided on both sides of the main body 220, and the two connecting portions 210 can be arranged opposite to each other. When the armature 200 is installed on the magnetic yoke 100, the first side plate 120 and the second side plate 130 can be located between the two connecting portions 210, and the first side plate 120 can contact one of the connecting portions 210, and the second side plate 130 can contact the other connecting portion 210.
[0060] The connecting part 210 can be fixedly connected to the end of the main body 220 away from the operating mechanism inside the snap-action circuit breaker, thus reducing the impact of the connecting part 210 on the operating mechanism inside the snap-action circuit breaker. The connecting part 210 can be rotatably connected to the magnetic yoke 100, so that the connecting part 210 can drive the main body 220 to rotate during rotation, enabling the main body 220 to be linked with the operating mechanism inside the snap-action circuit breaker.
[0061] The distance between the first end of the main body 220 and the first air gap surface 110 approaches zero. Approaching zero means that the distance between the first end and the first air gap surface 110 can be 0.03mm, 0.15mm or 0.2mm, etc.
[0062] The electromagnetic system has two states: a released state and an engaged state. In the released state, the main body 220 and the yoke 100 form a certain angle, and the distance between the first air gap surface 110 and the second air gap surface 230 is at its maximum. In the engaged state, the first air gap surface 110 and the second air gap surface 230 are in contact.
[0063] In some possible embodiments, the connecting part 210 can be an L-shaped structure, which includes a connecting section and a rotating section connected to each other. The rotating section is bent away from the control mechanism relative to the connecting section. The connecting section can be fixedly connected to the main body 220, and the end of the rotating section away from the connecting section can be rotatably connected to the magnetic yoke 100. With this arrangement, the rotation center of the main body 220 can be moved away from the control mechanism in the snap-action circuit breaker, thereby enabling the first air gap surface 110 and the second air gap surface 230 to make better contact.
[0064] In summary, compared to the prior art where the connecting part 210 is connected to one end of the main body 220, the two connecting parts 210 in this application are located on both sides of the main body 220. This eliminates the gap between the connecting parts 210 and the main body 220. Therefore, when the armature 200 is mounted on the yoke 100, the main body 220 can be positioned closer to the yoke 100. When the main body 220 is positioned closer to the yoke 100, the distance between the first end of the main body 220 and the first air gap surface 110 can approach zero, thus reducing the air gap between the armature 200 and the yoke 100. When the air gap between the armature 200 and the yoke 100 is reduced, the magnetic resistance is reduced. When the magnetic resistance is reduced, the electromagnetic attraction force generated by the yoke 100 can be greater, thus better attracting the armature 200, making the armature 200 more sensitive and faster in response, thereby improving the tripping rate of the snap-action circuit breaker.
[0065] like Figures 4 to 5 As shown, the connecting portion 210 is integrally formed with the main body portion 220, and the connecting portion 210 is connected to the main body portion 220 by bending. The connecting portion 210 includes a first connecting portion and a second connecting portion. The first connecting portion has a first sidewall 212, and the second connecting portion has a second sidewall 213. The first sidewall 212 faces the second connecting portion, and the second sidewall 213 faces the first connecting portion. The included angle between the second air gap surface 230 and the first sidewall 212 is 90°, and the included angle between the second air gap surface 230 and the second sidewall 213 is 90°.
[0066] The first sidewall 212 and the second sidewall 213 can be two opposing sidewalls on the two connecting parts 210 respectively. When the magnetic yoke 100 is installed on the armature 200, the first sidewall 212 can contact the first side plate 120, and the second sidewall 213 can contact the second side plate 130.
[0067] The first connecting portion and the second connecting portion are respectively disposed on both sides of the main body portion 220. The first side wall 212 is disposed on the first connecting portion and faces the second connecting portion. The second side wall 213 is disposed on the second connecting portion and faces the first connecting portion. Thus, the first side wall 212 is connected to the second air gap surface 230, and the second side wall 213 is also connected to the second air gap surface 230.
[0068] The angle between the second air gap surface 230 and the first sidewall 212 is 90°, that is, the second air gap surface 230 and the first sidewall 212 are perpendicular to each other. The angle between the second air gap surface 230 and the second sidewall 213 is 90°, that is, the second air gap surface 230 and the second sidewall 213 are perpendicular to each other.
[0069] The first side plate 120, the connecting plate 140, and the second side plate 130 are connected end to end to form a U-shaped magnetic yoke 100. The first side plate 120 is perpendicular to the connecting plate 140, and the second side plate 130 is perpendicular to the connecting plate 140. When the first connecting part is rotatably connected to the outside of the first side plate 120, and the second connecting part is rotatably connected to the outside of the second side plate 130, the first side wall 212 can fit against the outside of the first side plate 120, and the second side wall 213 can fit against the outside of the second side plate 130.
[0070] In summary, by bending, the connecting part 210 and the main body 220 are integrally formed, which simplifies the operation and reduces the manufacturing cost of the armature 200. The angle between the second air gap surface 230 and the first side wall 212 is 90°, and the angle between the second air gap surface 230 and the second side wall 213 is also 90°. This reduces the problem of incomplete engagement between the first air gap surface 110 and the second air gap surface 230 when the connection angle between the second air gap surface 230 and the first side wall 212 is an arc angle, and / or when the connection angle between the second air gap surface 230 and the second side wall 213 is an arc angle, thereby improving the reliability of the electromagnetic system.
[0071] like Figures 2 to 4 As shown, both the first side plate 120 and the second side plate 130 have a first through hole 150 at one end near the connecting part 210, and both connecting parts 210 have a second through hole 211, with the second through hole 211 positioned opposite to the first through hole 150. The electromagnetic system also includes a rotating shaft 300, which passes through the two first through holes 150 and the two second through holes 211.
[0072] Because the connecting part 210 is rotatably connected to the magnetic yoke 100, and the connecting part 210 is located on the side of the main body 220 away from the control mechanism inside the snap-action circuit breaker, the first through hole 150 can be located at the end of the magnetic yoke 100 away from the control mechanism. Because the magnetic yoke 100 includes a first side plate 120 and a second side plate 130, and the first side plate 120 and the second side plate 130 are positioned opposite each other, when the magnetic yoke 100 is provided with the first through hole 150, the end of the first side plate 120 away from the control mechanism can be provided with a first through hole 150, and the end of the second side plate 130 away from the control mechanism can also be provided with a first through hole 150. The first through hole 150 provided on the first side plate 120 can be positioned opposite to the first through hole 150 provided on the second side plate 130.
[0073] Since there are two connecting parts 210, a second through hole 211 can be provided on both connecting parts 210. When the armature 200 is installed on the magnetic yoke 100, the second through hole 211 provided on one of the connecting parts 210 can be opposite to the first through hole 150 provided on the first side plate 120, and the second through hole 211 provided on the other connecting part 210 can be opposite to the first through hole 150 provided on the second side plate 130.
[0074] The rotating shaft 300 can be a cylindrical structure. The rotating shaft 300 passes through the first through hole 150 and the second through hole 211, which can enable the armature 200 and the magnetic yoke 100 to be rotatably connected.
[0075] With the electromagnetic system in Figure 2 Taking the placement shown as an example, during the process of the electromagnetic system changing from the attracted state to the released state, the armature 200 can rotate counterclockwise around the pivot 300. During the process of the electromagnetic system changing from the released state to the attracted state, the armature 200 can rotate clockwise around the pivot 300.
[0076] It should be noted that the placement of the electromagnetic system in the illustrations of this application is only an example and does not impose any specific limitations on the placement of the electromagnetic system. In actual design, the placement of the electromagnetic system can be flexibly selected according to the design requirements.
[0077] In summary, the magnetic yoke 100 is provided with a first through hole 150, and the connecting part 210 is provided with a second through hole 211. The first through hole 150 and the second through hole 211 are positioned correspondingly. When the rotating shaft 300 passes through the first through hole 150 and the second through hole 211, the armature 200 can be rotatably connected to the magnetic yoke 100. This hole-shaft mating method achieves a rotatable connection between the armature 200 and the magnetic yoke 100. While ensuring mechanical performance, this hole-shaft mating assembly method is more flexible, has lower manufacturing costs, and also reduces the cost of subsequent maintenance and replacement.
[0078] In addition to achieving the rotational connection between the armature 200 and the yoke 100 by means of the aforementioned rotating shaft 300 passing through the two first through holes 150 and the two second through holes 211, this application can also achieve the rotational connection between the armature 200 and the yoke 100 by at least the following means.
[0079] For example, the side of the first side plate 120 facing away from the second side plate 130 may be provided with a protrusion, and the side of the second side plate 130 facing away from the first side plate 120 may also be provided with a protrusion. A blind groove may be provided on the first side wall 212, and a blind groove may also be provided on the second side wall 213.
[0080] When the armature 200 is installed on the magnetic yoke 100, the protrusion provided on the first side plate 120 can be located in the blind groove provided on the first side wall 212, and the protrusion and the blind groove can be rotatably connected. The protrusion provided on the second side plate 130 can be located in the blind groove provided on the second side wall 213, and the protrusion and the blind groove can be rotatably connected.
[0081] To facilitate the installation of the rotating shaft 300, armature 200, and magnetic yoke 100, such as Figure 3 as well as Figure 4 As shown, both the openings of the first through hole 150 and the second through hole 211 are chamfered.
[0082] The chamfer can be a bevel set at the edge of the first through hole 150 and the second through hole 211. The chamfer angle can be 30°, 45° or 60°, etc.
[0083] In summary, the chamfering at the openings of the first through hole 150 and the second through hole 211 not only provides guidance for the shaft 300 during installation, but also removes the sharp edges of the first through hole 150 and the second through hole 211, making their edges smoother. This increases the safety of installers during the installation of the shaft 300.
[0084] Please continue to refer to Figure 3 as well as Figure 4 As shown, at least one end of the rotating shaft 300 is tightly fitted with the first through hole 150.
[0085] One end of the rotating shaft 300 can be interference-fitted with the first through hole 150 provided on the first side plate 120, or one end of the rotating shaft 300 can be interference-fitted with the first through hole 150 provided on the second side plate 130, or both ends of the rotating shaft 300 can be interference-fitted with the first through hole 150 provided on the first side plate 120 and the first through hole 150 provided on the second side plate 130, respectively.
[0086] With the electromagnetic system in Figure 2 Taking the placement shown as an example, during the process of the electromagnetic system changing from the attracted state to the released state, or from the released state to the attracted state, the armature 200 can rotate counterclockwise or clockwise around the rotating shaft 300 as the rotation center, and the rotating shaft 300 does not rotate.
[0087] In summary, the rotating shaft 300 is tightly fitted at least one end with the first through hole 150, which fixes the rotating shaft 300 to the magnetic yoke 100. When the armature 200 is installed on the magnetic yoke 100, the first side plate 120 and the second side plate 130 are located between the two rotating parts, with one rotating part in contact with the first side plate 120 and the other rotating part in contact with the second side plate 130. This prevents the armature 200 from moving along the arrangement direction of the first side plate 120 and the second side plate 130. At this time, the rotating shaft 300 is inserted into the first through hole 150 and the second through hole 211, and is tightly fitted with the first through hole 150. This fixes the relative positions of the armature 200, the magnetic yoke 100, and the rotating shaft 300, preventing the armature 200 from falling off the rotating shaft 300 and the rotating shaft 300 from falling off the magnetic yoke 100, thus reducing the possibility of disintegration of the electromagnetic system during use. This design improves the reliability of the electromagnetic system.
[0088] like Figure 2 As shown, the electromagnetic system includes an elastic element 430, which is located on the side of the main body 220 facing away from the magnetic yoke 100. The first end of the elastic element 430 is fixed in position, and the second end of the elastic element 430 is connected to the armature 200. During the process from the initial attraction between the first air gap surface 110 and the second air gap surface 230 to the maximum distance between the first air gap surface 110 and the second air gap surface 230, the elastic element 430 can reset the armature 200.
[0089] The elastic element 430 can be a tension spring, which may include a first end and a second end that are positioned opposite each other.
[0090] With the electromagnetic system in Figure 2 Taking the placement shown as an example, due to a short circuit or other fault in the snap-action circuit breaker, the instantaneous current in the conductive component suddenly increases, and the magnetic field at the conductive component inside the magnetic yoke 100 also suddenly increases. The electromagnetic attraction generated by the magnetic yoke 100 then suddenly increases. At this time, the electromagnetic attraction is greater than the tension of the elastic element 430, causing the armature 200 to rotate clockwise until the first air gap surface 110 and the second air gap surface 230 come into contact, further stretching the elastic element 430. At this point, the electromagnetic system transitions from a released state to an engaged state.
[0091] Please continue to consider the electromagnetic system as being in a state of flux. Figure 2 Taking the placement shown as an example, when the electromagnetic system transitions from the released state to the engaged state, the snap-action circuit breaker trips internally, the current in the conductive component disappears, and the magnetic field at the conductive component inside the yoke 100 also disappears. At this time, the yoke 100 no longer generates electromagnetic attraction. Under the force of the elastic element 430 restoring its deformation, the armature 200 rotates counterclockwise until the blocking element in the receiving cavity limits the armature 200. At this point, the electromagnetic system transitions from the engaged state to the released state.
[0092] With the above configuration, when the electromagnetic system transitions from the engaged state to the released state, the force of the elastic element 430 during its recovery deformation allows it to reset the armature 200. This reduces the likelihood of the snap-action circuit breaker failing to trip during subsequent use due to the armature 200 not resetting. The elastic element 430 improves the reliability of the electromagnetic system, thereby enhancing the reliability of the snap-action circuit breaker.
[0093] Please continue to refer to Figures 2 to 5 As shown, the magnetic yoke 100 is provided with a first connecting rod 410, and the body part 220 is provided with a second connecting rod 420 at the end away from the connecting part 210. The first end is connected to the first connecting rod 410 to fix the position of the first end, and the second end of the elastic member 430 is connected to the second connecting rod 420.
[0094] The first link 410, the second link 420, and the elastic element 430 can form the reset structure 400 of the electromagnetic system.
[0095] The first connecting rod 410 can be a rod-shaped structure provided on the magnetic yoke 100. The first connecting rod 410 can be provided on the first air gap surface 110, and the first connecting rod 410 can extend in a direction away from the connecting plate 140. The first connecting rod 410 can be provided on the side of the magnetic yoke 100 near the connecting part 210. The first connecting rod 410 can be integrally formed with the magnetic yoke 100, or the first connecting rod 410 can be provided on the magnetic yoke 100 by welding or bonding after the magnetic yoke 100 is formed.
[0096] The second link 420 can be a rod-shaped structure mounted on the armature 200. Because the second link 420 needs to cooperate with the first link 410, it can be located on the side of the armature 200 facing away from the yoke 100. Similarly, the second link 420 can also extend in a direction away from the connecting plate 140. The second link 420 can be integrally formed with the armature 200, or it can be mounted on the armature 200 after it has been formed by welding or bonding.
[0097] The first connecting rod 410 may be provided with a groove for suspending the elastic element 430, and the second connecting rod 420 may also be provided with a groove for suspending the elastic element 430. The first end of the elastic element 430 may be connected to the groove provided on the first connecting rod 410, and the second end of the elastic element 430 may be connected to the groove provided on the second connecting rod 420.
[0098] In summary, the first connecting rod 410 is mounted on the magnetic yoke 100, which remains stationary. When the first end of the elastic element 430 is connected to the first connecting rod 410, the first end of the elastic element 430 also remains stationary. The armature 200 rotates around the pivot 300, which is mounted on the connecting portion 210. The second connecting rod 420 is located at the end of the main body 220 furthest from the connecting portion 210. When the electromagnetic system is in the engaged state, the elastic element 430 can be stretched further, resulting in a stronger force generated when the elastic element 430 recovers its deformation, thus making the reset process of the armature 200 more reliable.
[0099] Figure 6 This is a schematic diagram illustrating another configuration of the electromagnetic system provided in an embodiment of this application. In some possible embodiments, such as... Figure 6 As shown, there are two first connecting rods 410 and two elastic members 430. One first connecting rod 410 is disposed on the first side plate 120, and the other first connecting rod 410 is disposed on the second side plate 130. The second connecting rod 420 is equidistant from both sides of the main body 220. The first end of the first elastic member 430 is connected to the first first connecting rod 410, and the second end of the first elastic member 430 is connected to the second connecting rod 420. The first end of the second elastic member 430 is connected to the second first connecting rod 410, and the second end of the second elastic member 430 is connected to the second connecting rod 420.
[0100] In the above embodiment, two first connecting rods 410 are respectively disposed on the first side plate 120 and the second side plate 130, and the second connecting rod 420 is disposed in the middle of the end of the main body 220 away from the connecting part 210. When one elastic member 430 connects the first connecting rod 410 disposed on the first side plate 120 and the second connecting rod 420 disposed on the main body 220, and the other elastic member 430 connects the first connecting rod 410 disposed on the second side plate 130 and the second connecting rod 420 disposed on the main body 220, the reset process of the armature 200 can be made more stable, reducing the problem that the armature 200 will shift during the reset process due to the reset structure 400 being disposed on one side. This can improve the reliability of the electromagnetic system and thus improve the reliability of the snap-action circuit breaker.
[0101] To further increase the reliability of electromagnetic systems, such as Figure 1 as well as Figure 2 As shown, the first link 410 is provided with an extension section 411, which extends in a direction away from the second link 420.
[0102] The extension section 411 can be a protrusion structure provided on the side of the first link 410 away from the magnetic yoke 100 facing away from the second link 420. When the electromagnetic system is installed inside the housing 600 of the snap-action circuit breaker, the extension section 411 can abut against the inner wall of the housing 600, or the distance between the end of the extension section 411 away from the second link 420 and the inner wall of the housing 600 can be less than the wire diameter of the elastic element 430.
[0103] With the above configuration, during the process of the electromagnetic system changing from the attracted state to the released state, the elastic element 430 will generate a force by restoring its deformation. This force will cause the elastic element 430 to move away from the second link 420. Since the first end of the elastic element 430 is connected to the first link 410, and an extension section 411 is provided on the first link 410, and the extension section 411 extends away from the second link 420, the possibility of the first end of the elastic element 430 falling off the first link 410 can be reduced, thus improving the reliability of the electromagnetic system.
[0104] like Figure 2 As shown, in some possible embodiments, the electromagnetic system further includes a contact plate 500, which is partially disposed within the magnetic yoke 100. A protruding structure is provided on the side of the connecting plate 140 facing the armature 200, and a fixing hole is provided on the contact plate 500 opposite to the protruding structure. The protruding structure cooperates with the fixing hole to fix the contact plate 500 to the magnetic yoke 100.
[0105] The contact plate 500 can be configured as a conductive element of a snap-action circuit breaker. The contact plate 500 can be plate-shaped and may include two opposite ends, one end of which can be electrically connected to an external power source, and the other end of which can be used to house the stationary contact of the snap-action circuit breaker. The portion between the two ends of the contact plate 500 can be located within the yoke 100.
[0106] The connecting plate 140 may have a protrusion on the side facing the armature 200, and the contact plate 500 may have a fixing hole, which can be a through hole or a blind hole with its opening facing the connecting plate 140. The protrusion on the connecting plate 140 can enter the fixing hole to fix the connecting plate 140 and the contact plate 500. When the contact plate 500 is fixedly connected to the magnetic yoke 100, the contact plate 500 can fit against the connecting plate 140.
[0107] In one possible embodiment, the connecting plate 140 may be provided with fixing holes, and the contact plate 500 may be provided with protruding structures.
[0108] With the above configuration, the contact plate 500 can be used as a conductive component in an electromagnetic system. The connecting plate 140 has a raised structure, and the contact plate 500 has a fixing hole. The raised structure and the fixing hole cooperate to fix the contact plate 500 to the magnetic yoke 100, thus reducing the possibility of the contact plate 500 falling out of the magnetic yoke 100. When the contact plate 500 is connected to the magnetic yoke 100, the contact plate 500 and the magnetic yoke 100 are in close contact, allowing the contact plate 500 to have a larger contact area with the magnetic yoke 100, making the installation of the contact plate 500 more stable. The contact plate 500 is plate-shaped, and the area through which current flows is large, reducing energy loss and thus improving conductivity.
Claims
1. An electromagnetic system, characterized in that, include: The magnetic yoke includes a first side plate, a connecting plate, and a second side plate. The first side plate, the connecting plate, and the second side plate are connected sequentially to form a U-shaped structure. The sidewalls of the first side plate and the second side plate away from the connecting plate form a first air gap surface. The armature includes a body and two connecting parts. The body is located on one side of the first air gap surface, and the two connecting parts are connected to the first end of the body. One of the connecting parts is rotatably connected to the outside of the first side plate, and the other connecting part is rotatably connected to the outside of the second side plate. The main body includes a second air gap surface facing the connecting plate. When the electromagnetic system is in the released state, the distance between the portion of the second air gap surface near the first end and the first air gap surface tends to be zero. When the armature rotates relative to the yoke until the second air gap surface and the first air gap surface are attracted, the electromagnetic system is attracted.
2. The electromagnetic system according to claim 1, characterized in that, The connecting part is integrally formed with the main body, and the connecting part is connected to the main body by bending. The connecting portion includes a first connecting portion and a second connecting portion. The first connecting portion is provided with a first sidewall, and the second connecting portion is provided with a second sidewall. The first sidewall faces the second connecting portion, and the second sidewall faces the first connecting portion. The angle between the second air gap surface and the first sidewall is 90°.
3. The electromagnetic system according to claim 1, characterized in that, Both the first side plate and the second side plate are provided with a first through hole at one end near the connecting part, and the two connecting parts are provided with a second through hole, with the second through hole being opposite to the first through hole. The electromagnetic system also includes a rotating shaft that passes through two first through holes and two second through holes.
4. The electromagnetic system according to claim 3, characterized in that, Both the first through hole and the second through hole have chamfered openings.
5. The electromagnetic system according to claim 3, characterized in that, At least one end of the rotating shaft is tightly fitted with the first through hole.
6. The electromagnetic system according to claim 5, characterized in that, The electromagnetic system includes an elastic element located on the side of the body facing away from the magnetic yoke; The first end of the elastic element is fixed in position, and the second end of the elastic element is connected to the armature; During the process from the initial attraction between the first air gap surface and the second air gap surface to the maximum distance between the first air gap surface and the second air gap surface, the elastic element enables the armature to return to its original position.
7. The electromagnetic system according to claim 6, characterized in that, The magnetic yoke is provided with a first connecting rod, and the body part is provided with a second connecting rod at the end away from the connecting part; The first end is connected to the first connecting rod to fix the position of the first end, and the second end of the elastic element is connected to the second connecting rod.
8. The electromagnetic system according to claim 7, characterized in that, The first link has an extension section that extends in a direction away from the second link.
9. The electromagnetic system according to any one of claims 1-8, characterized in that, It also includes a contact plate, the contact plate portion being disposed within the magnetic yoke; The connecting plate has a protruding structure on the side facing the armature, and the contact plate has a fixing hole at the position opposite to the protruding structure. The protruding structure cooperates with the fixing hole to fix the contact plate to the magnetic yoke.
10. A snap-action circuit breaker, characterized in that, Includes a housing and an electromagnetic system as described in any one of claims 1 to 9; The housing is provided with a receiving cavity; The electromagnetic system is disposed within the receiving cavity; The cavity is provided with a blocking element, which can limit the armature.