Magnetic circuit structure and relay

Abstract

The utility model relates to the technical field of electronic control devices, and relates to a magnetic circuit structure and a relay. The magnetic circuit structure comprises two yokes, an armature and a permanent magnet, at least one yoke is provided with a bulge on one side facing the other yoke, the bulge is provided with an end face on one side facing the other yoke, and the end face is arranged opposite to the other yoke; the arrangement direction of the two yokes forms a first direction; the permanent magnet is located between the two yokes and makes contact with the surface, not provided with the protruding bracts, of one yoke, and the permanent magnet is arranged in a manner of avoiding the protruding bracts. The armature is positioned between the two yokes; in the length direction of the armature, one end of the armature serves as a fixed fulcrum to rotate relative to the yoke, and the other end of the armature swings relative to the yoke. The armature avoids the convex bracts and the permanent magnet in the second direction, and the second direction is perpendicular to the first direction and the length direction of the armature. The magnetic circuit structure can reduce the assembly difficulty, simplify the assembly steps, and improve the assembly efficiency and the assembly yield.

Description

Magnetic circuit structure and relay Technical Field

[0001] This utility model relates to the field of electronic control device technology, and more specifically, to a magnetic circuit structure and a relay. Background Technology

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is commonly used in automatic control circuits. Essentially, a relay is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] The relays in the related technology include a magnetic circuit structure and a contact structure. The magnetic circuit structure includes two yokes, a permanent magnet, a magnetic conductive plate, and an armature. During assembly, the two symmetrical yokes need to be installed into the base first, and then the permanent magnet and the magnetic conductive plate are installed between the two yokes.

[0004] However, due to the large number of parts in the magnetic circuit assembly process, the iron parts in the aforementioned structural components can only be manually picked up and placed into the base using tweezers. Furthermore, the yoke, magnetic guide plate, and permanent magnet parts matched for monostable or magnetically held models are different, causing difficulties in production management. Simultaneously, due to machining errors in the parts, the machining errors of the yoke, magnetic guide plate, and permanent magnet will either amplify the preset gap size between them or tighten the interference fit. It is worth noting that the amplified gap size affects the magnetic circuit's magnetic conductivity, and the lack of positioning between the magnetic guide plate and the permanent magnet easily leads to part misalignment; while the tightened interference fit easily causes the permanent magnet to be crushed under pressure, making it difficult to manually squeeze it into the center of the base. Summary of the Invention

[0005] This utility model provides a magnetic circuit structure and a relay, which can reduce assembly difficulty, simplify assembly steps, and improve assembly efficiency and yield.

[0006] This utility model embodiment provides a magnetic circuit structure, including: two yokes, an armature, and a permanent magnet, wherein:

[0007] At least one of the yokes has a protrusion on the side facing the other yoke, the protrusion having an end face on the side facing the other yoke, the end face being directly opposite the other yoke, for forming a magnetic path between the end face and the portion of the other yoke directly opposite the end face; the arrangement direction of the two yokes forms a first direction;

[0008] The permanent magnet is located between the two yokes and contacts the surface of one of the yokes without the protrusions, and the permanent magnet is arranged to avoid the protrusions;

[0009] The armature is located between the two yokes; along the length of the armature, one end of the armature is rotatably positioned relative to the yoke as a fixed fulcrum, and the other end of the armature is oscillating relative to the yoke; the armature avoids the protrusion and the permanent magnet in a second direction, which is perpendicular to the first direction and the length of the armature.

[0010] According to some embodiments of this utility model, both yokes are provided with the protrusions, and the end faces of the protrusions in the two yokes are arranged facing each other.

[0011] According to some embodiments of this utility model, the end face is spaced apart from another yoke.

[0012] According to some embodiments of this utility model, the two yokes are arranged parallel to each other and side by side along the first direction.

[0013] According to some embodiments of the present invention, the number of protrusions provided on the yoke is one; the protrusion is located at one end of the yoke in a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0014] According to some embodiments of the present invention, the number of protrusions provided on the yoke is multiple; the multiple protrusions are spaced apart along a third direction, the third direction being perpendicular to the first direction and the second direction.

[0015] According to some embodiments of this utility model, the bulge is a protruding structure formed by stamping the yoke;

[0016] Alternatively, the bulge is a protruding structure provided on the surface of the yoke.

[0017] According to some embodiments of the present invention, in a plane perpendicular to the first direction, the cross-sectional shape of the protrusion structure is rectangular, trapezoidal, or circular.

[0018] According to some embodiments of the present invention, the yoke has an upper region and a lower region, the lower region and the upper region being arranged along the second direction; the bulge is located in the lower region; the armature corresponds to the upper region, and the permanent magnet corresponds to the lower region.

[0019] According to some embodiments of the present invention, each of the yokes includes two oppositely arranged extension arms and a connecting section connecting the two extension arms, wherein the connecting section cooperates with the two extension arms to form a U-shaped structure.

[0020] One end of the armature contacts one extension arm of the yoke through an arc-shaped contact surface and is rotatably mounted relative to the yoke, while the other end is oscillating relative to the other extension arm of the yoke.

[0021] The protrusion is provided at the connecting section of the yoke;

[0022] The permanent magnet is placed between the two yokes and is in contact with the surface of the connecting section of one of the yokes that does not have the protrusion.

[0023] According to some embodiments of the present invention, the extension arm is provided with a protrusion, and the side surface of the protrusion facing the armature forms the arc-shaped contact surface;

[0024] Alternatively, the armature may have a protrusion, and the side surface of the protrusion facing the yoke may form the arc-shaped contact surface.

[0025] This utility model embodiment provides a relay, which includes the magnetic circuit structure provided by any of the technical solutions in the first aspect above.

[0026] One embodiment of the above-described utility model has at least the following advantages or beneficial effects:

[0027] 1. When assembling the magnetic circuit structure provided in this application, only the permanent magnet needs to be attached to the surface of a yoke, with a gap provided between the permanent magnet and the yoke on the other side to isolate the magnetism through the gap. Accordingly, because of the gap provided between the permanent magnet and the yoke on the other side, the assembly of the magnetic circuit structure in this application does not depend on the forming tolerances of each structural component, which can reduce the difficulty of manufacturing parts.

[0028] 2. The magnetic circuit structure provided in this application contains two magnetic loops: one is the main loop, which maintains or operates between the permanent magnet, the yoke, and the armature; the other is the reinforcing loop, which connects the permanent magnet and the two yokes. The protrusions in this application can enhance the magnetic flux from one yoke to the other, increasing magnetic conductivity. Therefore, the magnetic circuit structure provided in this application achieves the effect of a magnetically conductive sheet by forming protrusions on at least one yoke and cooperating with the permanent magnet to form a magnetically conductive loop. This reduces the number of parts in the magnetic circuit structure, simplifying assembly steps, reducing assembly difficulty, and improving assembly efficiency and yield.

[0029] 3. In this application, the inner bulge and the permanent magnet are positioned to avoid the armature in the second direction, allowing sufficient space for the armature to swing. Furthermore, the protrusion size and position of the bulge can be designed independently according to requirements, without being limited by the armature, thus optimizing the magnetic conductivity. Therefore, while meeting the requirements for armature swing space and permanent magnet magnetic force, the two yokes in this application can be spaced apart along the first direction, further reducing the space occupied by the magnetic circuit and achieving a compact and miniaturized relay design. Attached Figure Description

[0030] Figure 1 shows an exploded view of the relay provided in an embodiment of the present invention;

[0031] Figure 2 shows a schematic diagram of the assembled structure in Figure 1;

[0032] Figures 3 to 6 show the usage principle diagrams of the magnetic circuit structure provided in the embodiments of this utility model;

[0033] Figure 7 shows a three-dimensional structural schematic diagram of the magnetic circuit structure provided in the embodiment of this utility model;

[0034] Figure 8 shows an explosion diagram of the magnetic circuit structure in Figure 7;

[0035] Figure 9 shows a three-dimensional schematic diagram of part of the structure in Figure 7;

[0036] Figure 10 shows a plan view of the structure in Figure 9;

[0037] Figure 11 shows a cross-sectional view at point AA in Figure 10.

[0038] The annotations in the attached figures are explained as follows:

[0039] 100, yoke; 110, bulge; 200, armature; 300, permanent magnet; 400, coil frame; 500, coil; 600, mounting base; 700, contact assembly; 710, moving contact; 711, moving contact bracket; 712, moving contact piece; 720, stationary contact. Detailed Implementation

[0040] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0041] This application provides a relay. The relay provided in this application can be applied to a starting voltage range of 50% to 70%. Referring to the structure shown in Figures 1 and 2, the relay includes a magnetic circuit structure and a contact structure. The magnetic circuit structure includes a magnetic circuit assembly and a coil assembly. The magnetic circuit assembly includes a yoke 100, an armature 200, and a permanent magnet 300. The coil assembly includes a coil frame 400, a coil 500, and coil terminals. The coil 500 can also be referred to as enameled wire, and the coil 500 is wound around the surface of the coil frame 400. The coil terminals are connected to the coil 500. The armature 200 passes through a through hole in the coil frame 400. Both the magnetic circuit assembly and the coil assembly are mounted on a mounting base 600. The permanent magnet 300 can be made of ferrite Y33.

[0042] As an example, as shown in Figures 1 and 2, the magnetic circuit assembly includes two yokes 100, with an armature 200 positioned between them. Along the length of the armature 200, one end of the armature 200 serves as a fixed fulcrum and can rotate relative to the yoke 100, while the other end can swing relative to the yoke 100, thereby driving the pusher to activate the contact structure. When the coil 500 is energized, the armature 200 swings under the action of the yoke 100. If a monostable relay is used, when the coil 500 is de-energized, the armature 200 swings in the opposite direction due to the spring's reaction force, bringing it into contact with the other yoke 100 and returning to its initial open state.

[0043] As an example, the contact structure includes two sets of contact components 700, located on both sides of the armature 200 along a first direction. The specific structures of the two sets of contact components 700 may be the same or different. Taking the two sets of contact components 700 being the same as an example, each set of contact components 700 includes a moving contact 710 and a stationary contact 720. The moving contact 710 includes a moving contact bracket 711 and a moving contact piece 712. The moving contact bracket 711 is inserted into the mounting base 600, and the moving contact piece 712 is mounted on the moving contact bracket 711 and moves with the armature 200. The stationary contact 720 includes a stationary contact piece, which is mounted on the mounting base 600, and the stationary contact piece and the moving contact piece 712 form a contact point. As an example, the moving contact piece 712 moves with the armature 200 by a push-lock mechanism.

[0044] In relay applications, as shown in Figure 3, the relay contains two yokes 100, one with a north (N) pole and the other with a south (S) pole. In the initial open state, the armature 200 is non-magnetic and is held in the open state by the permanent magnet 300. Along the length of the armature 200, one end contacts the yoke 100 with the N pole, and the other end contacts the yoke 100 with the S pole. As shown in Figure 4, when the coil 500 is energized, the armature 200 generates both N and S poles. Specifically, the end of the armature 200 in contact with the yoke 100 with the N pole generates the N pole, and the end in contact with the yoke 100 with the S pole generates the S pole. Due to the principle of like poles repelling each other, the repulsive force drives the armature 200 to oscillate. As shown in Figure 5, the armature 200 continues to move in the intermediate state by inertia until the N pole end of the armature 200 attracts the opposite pole of the yoke 100 with the S pole polarity. At the same time, the S pole end of the armature 200 attracts the opposite pole of the yoke 100 with the N pole polarity, accelerating the movement of the armature 200 and bringing the armature 200 to the position shown in Figure 6. At this time, the contacts in the contact structure are closed in place.

[0045] It is worth noting that the magnetic circuit structure in the relay provided in this application embodiment can be any of the following technical solutions.

[0046] This application provides a magnetic circuit structure. Referring to the structure shown in Figures 7 to 9, the magnetic circuit structure includes: two yokes 100, an armature 200, and a permanent magnet 300, wherein: at least one yoke 100 has a protrusion 110 on the side facing the other yoke 100, the protrusion 110 has an end face on the side facing the other yoke 100, and the end face is directly opposite to the other yoke 100, so as to form a magnetic conductive path between the end face and the part of the other yoke 100 directly opposite the end face; the arrangement direction of the two yokes 100 forms a first direction.

[0047] It is understandable that the structure opposite to the end face of the protrusion 110 can be the surface of the yoke 100 where the protrusion 110 is not provided, or the structure opposite to the end face of the protrusion 110 on another yoke 100 can be the end face of the protrusion 110.

[0048] Referring to the structure shown in Figures 7 to 9, the armature 200 is located between two yokes 100. Along the length of the armature 200, one end of the armature 200 is rotatably positioned relative to the yoke 100 as a fixed fulcrum, while the other end of the armature 200 is oscillating relative to the yoke 100. Exemplarily, this embodiment includes only one armature 200, and the armature 200 is generally a flat plate structure, which is not only lightweight but also saves on parts and reduces costs.

[0049] Please continue referring to the structure shown in Figure 7. The permanent magnet 300 is located between the two yokes 100 and contacts the surface of one of the yokes 100 without the protrusion 110, while the permanent magnet 300 avoids the protrusion 100. It can be understood that the contact between the permanent magnet 300 and the yoke 100 is a surface-to-surface contact. The yoke 100 in contact with the permanent magnet 300 may or may not have the protrusion 110; it is only necessary to ensure that the contact position between the yoke 100 and the permanent magnet 300 is the part without the protrusion 110.

[0050] It is worth noting that, as shown in Figure 7, the armature 200 avoids the protrusion 110 and the permanent magnet 300 in a second direction, which is perpendicular to the first direction and the length direction of the armature 200.

[0051] It is understood that, for a clearer understanding of the magnetic circuit structure provided in the embodiments of this application, the first direction in each figure is now identified by Y, and the second direction by Z. When assembling the magnetic circuit structure provided in the embodiments of this application, only the permanent magnet 300 needs to be attached to the surface of a yoke 100. The permanent magnet 300 and the yoke 100 on the other side are spaced apart to isolate the magnetism through the gap. Therefore, because the permanent magnet 300 and the yoke 100 on the other side are spaced apart, the assembly of the magnetic circuit structure in the embodiments of this application does not depend on the forming tolerances of each structural component, which can reduce the difficulty of parts manufacturing.

[0052] Furthermore, referring to the structure shown in Figure 10, the magnetic circuit structure provided in this embodiment contains two magnetic loops. One is the magnetic loop that maintains or operates between the permanent magnet 300, the yoke 100, and the armature 200, i.e., the main loop; the other is the magnetic loop between the permanent magnet 300 and the two yokes 100, which serves as a reinforcing loop. The convex bud 110 in this embodiment can enhance the magnetic flux from one yoke 100 to the other, increasing the magnetic conductivity.

[0053] It is understandable that the magnetic path formed between the end face and the part of the other yoke 100 that is directly opposite the end face serves as part of the reinforcement circuit.

[0054] It should be noted that the magnetic circuit structure provided in this application embodiment forms a protrusion 110 on at least one yoke 100 and forms a magnetic circuit with a permanent magnet 300 to achieve the effect of a magnetic sheet. This can reduce the number of parts in the magnetic circuit structure, simplify the assembly steps, reduce the assembly difficulty, and improve the assembly efficiency and yield.

[0055] Furthermore, in this embodiment, the protrusion 110 and the permanent magnet 300 are positioned in the second direction Z to avoid the armature 200, allowing sufficient space for the armature 200 to swing. Moreover, the protrusion size and position of the protrusion 110 can be designed independently as needed, without being limited by the armature 200, thus optimizing the magnetic conductivity. Therefore, while meeting the swing space requirements of the armature 200 and the magnetic force requirements of the permanent magnet 300, compared to the magnetic circuit structure in related technologies, the two yokes 100 in this embodiment can be spaced apart along the first direction Y, further reducing the space occupied by the magnetic circuit and achieving a compact and miniaturized relay design.

[0056] For example, referring to the structure shown in Figure 7, the two yokes 100 are arranged parallel to each other along the first direction Y to increase the facing area of ​​the two yokes 100, so as to facilitate the reasonable layout of the protrusions 110. At this time, the first direction Y in this embodiment is approximately parallel to the thickness direction of the yokes 100, and the two yokes 100 can be spaced apart along their thickness direction.

[0057] It is understandable that the second direction Z is approximately parallel to the height direction of the yoke 100. The opposite side of the two yokes 100 can be referred to as the inner side. Accordingly, the armature 200 and the permanent magnet 300 are both placed on the inner side of the two yokes 100, and the protrusion 110 is also set on the inner side of the two yokes 100.

[0058] It is worth noting that in the magnetic circuit structure provided in this application embodiment, both yokes 100 may have protrusions 110, or only one yoke 100 may have a protrusion 110. It is understood that since the two yokes 100 are arranged side-by-side in the first direction Y, there is a certain gap between them to accommodate the armature 200 and the permanent magnet 300. At the protrusion 110 position, the gap between adjacent yokes 100 is reduced or even eliminated. In other words, the end face contacts the other yoke 100; or, the end face is spaced apart from the other yoke 100.

[0059] When only one yoke 100 is selected to set the protrusion 110, the protrusion 110 in the first direction Y needs to be set to a large size in order to effectively reduce or eliminate the gap between the two yokes 100. The specific details will not be elaborated here.

[0060] In one embodiment, referring to the structure shown in Figures 9 to 10, both yokes 100 are provided with protrusions 110, and the end faces of the protrusions 110 in the two yokes 100 are arranged facing each other.

[0061] It is worth noting that the end face gap of the two protrusions 110 is set to be greater than 0, as shown in Figure 11, to adjust the magnetic flux according to actual needs. When the gap d between the end faces of the two protrusions 110 is small enough, the two protrusions 110 may just touch, in which case there is no contact force between them. Furthermore, the gap d between the end faces of the two protrusions 110 should not be too large to avoid failing to form an effective magnetic path and affecting the magnetic conduction effect.

[0062] In this embodiment, the placement of the protrusion 110 can be varied, as long as it effectively avoids the permanent magnet 300. "Avoiding the permanent magnet 300" means that the protrusion 110 and the permanent magnet 300 are not opposite each other in the first direction Y, and that they do not affect each other in the second direction Z.

[0063] It is worth noting that the relay provided in this application embodiment also has a third direction as a directional reference standard, which is perpendicular to the first direction Y and the second direction Z. The third direction in each figure is now identified by X. It can be understood that the third direction X is approximately parallel to the length direction of the yoke 100.

[0064] As an example, as shown in Figure 9, the yoke 100 has one protrusion 110; the protrusion 110 is located at one end of the yoke 100 in the third direction X. That is, the protrusion 110 and the permanent magnet 300 are offset in the third direction X to avoid each other. It should be noted that this structure is easy to manufacture and can reduce the manufacturing difficulty and cost. Furthermore, the protrusion 110 is located at the end of the yoke 100 in the third direction X away from the swing side of the armature 200 to effectively avoid the armature 200.

[0065] Of course, compared with the position of the protrusion 110 shown in Figure 9, the position of the protrusion 110 can be moved inward from the end of the yoke 100 along the third direction X to shorten the magnetic conduction distance and improve the magnetic conduction effect.

[0066] It should be understood that in the above example, each yoke 100 has only one protrusion 110, and the protrusions 110 on two yokes 100 are positioned opposite each other. Of course, multiple protrusions 110 can be provided on each yoke 100 as needed. For example, the number of protrusions 110 on each yoke 100 can be multiple, and these multiple protrusions 110 can be spaced apart along the third direction X. The protrusions 110 on each yoke 100 can be positioned opposite each other to the protrusions 110 on another yoke 100, or they can be offset from the protrusions 110 on another yoke 100 along the third direction X.

[0067] Alternatively, only one yoke 100 may be selected to have a protrusion 110. When only one yoke 100 has a protrusion 110, the number of protrusions 110 on it can be one or more.

[0068] When forming the protrusion 110, the protrusion 110 can be achieved through various processes. In one embodiment, the protrusion 110 is a protruding structure formed by stamping the yoke 100, that is, the protrusion 110 and the yoke 100 are a stamped integral structure. For example, the material of the yoke 100 can be selected as DT4E (electromagnetic pure iron) to facilitate the stamping formation of the protrusion 110 on the surface of the yoke 100.

[0069] Alternatively, the protrusion 110 is a raised structure provided on the surface of the yoke 100. In this case, the protrusion 110 can be prepared on the surface of the yoke 100 by casting or cutting.

[0070] In this embodiment, the protruding structure can be a boss or a protruding post. For example, when the protrusion 110 is formed by a stamping process, the protrusion 110 can be a boss to ensure the overall structural strength after stamping and prevent the yoke 100 from breaking at the stamping point. Alternatively, when the protrusion 110 is formed by a cutting process, the protrusion 110 can be a protruding post to reduce the difficulty of cutting.

[0071] Understandably, the shape of the protrusion 110 can be adjusted as needed to optimize the magnetic conductive area and improve the magnetic conductivity. For example, in a plane perpendicular to the first direction Y, the cross-sectional shape of the protrusion structure is rectangular, trapezoidal, or circular.

[0072] Taking the yoke 100 relative to the ground as an example, the yoke 100 has an upper region and a lower region, which are arranged along a second direction Z. In one embodiment, the armature 200 corresponds to the upper region of the yoke 100 along the second direction Z, and the permanent magnet 300 corresponds to the lower region of the yoke 100 along the second direction Z; the bulge 110 is located in the lower region of the yoke 100.

[0073] It is understood that the upper region and the lower region refer to a certain range, rather than a specific location. In the embodiments of this application, the assembly position of the armature 200 corresponds to the upper region of the yoke 100, the assembly position of the permanent magnet 300 corresponds to the lower region of the yoke 100, and the protrusion 110 is provided in the lower region of the yoke 100.

[0074] It is worth noting that in this embodiment, the protrusion 110 is only provided in the lower region inside the yoke 100. This not only allows the upper region to be reserved for the armature 200 to swing, but also allows the protrusion size and placement of the protrusion 110 to be designed independently according to requirements, without being limited by the armature 200, thereby optimizing the magnetic conduction effect. Accordingly, while meeting the swing space requirements of the armature 200 and the magnetic force requirements of the permanent magnet 300, compared with the magnetic circuit structure in related technologies, the two yokes 100 in this embodiment can be spaced apart along the thickness direction, thereby further reducing the space occupied by the magnetic circuit and achieving a compact and miniaturized relay design.

[0075] In one embodiment, each yoke 100 includes two opposing extension arms and a connecting section connecting the two extension arms. The connecting section cooperates with the two extension arms to form a U-shaped structure to reduce the weight of the yoke 100, thereby facilitating the lightweight design of the relay.

[0076] In this embodiment, one end of the armature 200 contacts one extension arm of the yoke 100 through an arc-shaped contact surface and is rotatably arranged relative to the yoke 100, while the other end is oscillating relative to the other extension arm of the yoke 100; the protrusion 110 is provided on the connecting section of the yoke 100; the permanent magnet 300 is placed between the two yokes 100 and is in contact with the surface of the connecting section of one yoke 100 without the protrusion 110.

[0077] In one embodiment, the extension arm has a protrusion that forms an arcuate contact surface on one side of the armature 200; or, the armature 200 has a protrusion that forms an arcuate contact surface on one side of the yoke 100.

[0078] In summary, the magnetic circuit structure provided in this application embodiment changes the magnetic flux of the two yokes 100 by controlling the gap value and presence or absence between them.

[0079] For example, in a monostable relay design, to reduce the holding force of the permanent magnet 300 in the closed state, a gap can be added between the permanent magnet 300 and the yoke 100 to isolate the magnetic field, thereby reducing the holding force on the yoke 100 and adjusting the release voltage of the monostable product. When the excitation voltage of the coil 500 is removed, the holding force on the yoke 100 is less than the spring reaction force, meaning the contacts open due to the spring force. It is understandable that a larger closing holding force results in a smaller release voltage.

[0080] Finally, it should be noted that the various embodiments / implementations provided by this utility model can be combined with each other without creating contradictions, and will not be described in detail here.

[0081] In the embodiments of the utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the utility model according to the specific circumstances.

[0082] In the description of the utility model embodiments, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the utility model embodiments and simplifying the description, and do not indicate or imply that the device or unit 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 the utility model embodiments.

[0083] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0084] The above are merely preferred embodiments of the utility model and are not intended to limit the utility model. For those skilled in the art, various modifications and variations can be made to the utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the utility model should be included within the protection scope of the utility model.

Claims

1. A magnetic circuit structure, characterized in that, include: Two yokes, an armature, and a permanent magnet, wherein: at least one of the yokes has a protrusion on the side facing the other yoke, the protrusion having an end face on the side facing the other yoke, the end face being directly opposite to the other yoke, for forming a magnetic path between the end face and the portion of the other yoke directly opposite the end face; the arrangement direction of the two yokes forms a first direction; the permanent magnet is located between the two yokes and in contact with the surface of one yoke without the protrusion, and the permanent magnet is arranged to avoid the protrusion; the armature is located between the two yokes; along the length direction of the armature, one end of the armature is rotatably arranged relative to the yoke as a fixed fulcrum, and the other end of the armature is oscillating relative to the yoke; the armature avoids the protrusion and the permanent magnet in a second direction, the second direction being perpendicular to the first direction and the length direction of the armature.

2. The magnetic circuit structure according to claim 1, characterized in that, Both yokes are provided with the protrusions, and the end faces of the protrusions in the two yokes are arranged facing each other.

3. The magnetic circuit structure according to claim 1 or 2, characterized in that, The end face is spaced apart from the other yoke.

4. The magnetic circuit structure according to claim 1 or 2, characterized in that, The two yokes are arranged parallel to each other and side by side along the first direction.

5. The magnetic circuit structure according to claim 1 or 2, characterized in that, The number of protrusions provided on the yoke is one; the protrusion is located at one end of the yoke in a third direction, which is perpendicular to the first direction and the second direction.

6. The magnetic circuit structure according to claim 1 or 2, characterized in that, The number of protrusions disposed on the yoke is multiple; the multiple protrusions are spaced apart along a third direction, which is perpendicular to the first direction and the second direction.

7. The magnetic circuit structure according to claim 1 or 2, characterized in that, The protrusion is a protruding structure formed by stamping the yoke; or, the protrusion is a protruding structure provided on the surface of the yoke.

8. The magnetic circuit structure according to claim 7, characterized in that, In a plane perpendicular to the first direction, the cross-sectional shape of the protrusion structure is rectangular, trapezoidal, or circular.

9. The magnetic circuit structure according to claim 1 or 2, characterized in that, The yoke has an upper region and a lower region, which are arranged along the second direction; the bulge is located in the lower region; the armature corresponds to the upper region, and the permanent magnet corresponds to the lower region.

10. The magnetic circuit structure according to claim 9, characterized in that, Each yoke includes two opposing extension arms and a connecting section connecting the two extension arms. The connecting section and the two extension arms cooperate to form a U-shaped structure. One end of the armature contacts one extension arm of the yoke through an arc-shaped contact surface and is rotatably disposed relative to the yoke. The other end is oscillating relative to the other extension arm of the yoke. A protrusion is disposed on the connecting section of the yoke. The permanent magnet is placed between the two yokes and is in contact with the surface of the connecting section of one yoke without the protrusion.

11. The magnetic circuit structure according to claim 10, characterized in that, The extension arm has a protrusion, and the surface of the protrusion facing the armature forms the arc-shaped contact surface; or, the armature has a protrusion, and the surface of the protrusion facing the yoke forms the arc-shaped contact surface.

12. A relay, characterized in that, Includes the magnetic circuit structure as described in any one of claims 1-11.

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