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, the side, facing the other yoke, of at least one yoke is provided with a protrusion, and the side, facing the other yoke, of the protrusion is provided with an end face; the permanent magnet is positioned between the two yokes; and the permanent magnet is arranged opposite to the end surface of the bulge on one yoke, and the permanent magnet is in contact with the surface of the other yoke, so that a magnetic conduction path is formed among the end surface, the permanent magnet and the other yoke. According to the magnetic circuit structure, the number of structural parts can be reduced, assembling steps are simplified, assembling difficulty is reduced, and assembling efficiency and assembling yield are improved.

Description

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. Utility Model Content

[0005] This utility model provides a magnetic circuit structure and a relay. The magnetic circuit structure can reduce the number of structural components, simplify assembly steps, reduce assembly difficulty, 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, and the protrusion has an end face on the side facing the other yoke;

[0008] The permanent magnet is located between the two yokes; and the end face of the permanent magnet is directly opposite to the protrusion on one of the yokes, and the permanent magnet is in contact with the surface of the other yoke, so as to form a magnetic path between the end face, the permanent magnet and the other yoke.

[0009] According to some embodiments of this utility model, in the two yokes, each yoke is provided with a protrusion; the permanent magnet is in contact with one of the yokes through the protrusion, and the end face of the permanent magnet is directly opposite to the end face of the protrusion on the other yoke.

[0010] According to some embodiments of this utility model, in the two yokes, one of the yokes is provided with the protrusion; the permanent magnet is in contact with the yoke without the protrusion, and the end face of the permanent magnet is directly opposite to the end face of the protrusion on the other yoke.

[0011] According to some embodiments of this utility model, the end face is arranged in contact with the permanent magnet.

[0012] According to some embodiments of this utility model, the end face is spaced apart from the permanent magnet.

[0013] According to some embodiments of this utility model, the two yokes are arranged parallel and side by side along a first direction; the armature is located between the two yokes; along the length direction of the armature, one end of the armature is arranged as a fixed fulcrum and rotates relative to the yoke, and the other end of the armature is arranged to swing relative to the yoke; the armature avoids the protrusion and the permanent magnet in a second direction, and the second direction is perpendicular to the first direction and the length direction of the armature.

[0014] According to some embodiments of the present invention, the number of protrusions provided on the yoke is one;

[0015] Alternatively, the number of protrusions on the yoke may be multiple, and the multiple protrusions may be spaced apart along a third direction, which is perpendicular to the first direction and the second direction.

[0016] According to some embodiments of this utility model, the bulge is a protruding structure formed by stamping the yoke;

[0017] Alternatively, the bulge is a protruding structure provided on the surface of the yoke.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] The protrusion is provided at the connecting section of the yoke;

[0023] The permanent magnet is placed between the two yokes; the permanent magnet is in contact with the surface of the connecting section of one of the yokes and is directly opposite to the end face of the protrusion on the connecting section of the other yoke.

[0024] 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;

[0025] Alternatively, the armature may have a protrusion, and the side surface of the protrusion facing the yoke may form the arc-shaped contact surface.

[0026] This application also provides a relay, which includes the magnetic circuit structure provided by any of the above technical solutions.

[0027] One embodiment of the above-described utility model has at least the following advantages or beneficial effects:

[0028] 1. When assembling the magnetic circuit structure provided in this application, the permanent magnet is placed in contact with the surface of a yoke, and the permanent magnet is positioned directly opposite the end face of the protrusion on the other side of the yoke. The assembly of the magnetic circuit structure in this application is less dependent on the forming tolerances of each structural component, thus reducing the difficulty of parts manufacturing.

[0029] 2. In the magnetic circuit structure provided in this application, there is a magnetic circuit, i.e., a main circuit, between the yoke, armature, and permanent magnet for maintaining or operating states. The magnetic path formed between the end face of the protrusion, the permanent magnet, and another yoke piece is part of this main circuit. The magnetic circuit structure provided in this application allows adjustment of the magnetic flux transmitted from the permanent magnet to the yoke by adjusting the opposing areas of the protrusion and the permanent magnet, as well as the distance between them, thereby changing the holding force exhibited on the yoke. Accordingly, the magnetic circuit structure provided in this application, by forming a protrusion on at least one yoke piece, can cooperate with the permanent magnet to form a magnetic path, thereby reducing the number of parts within the magnetic circuit structure, simplifying assembly steps, reducing assembly difficulty, and improving assembly efficiency and yield.

[0030] 3. In the magnetic circuit structure provided in this application, the protrusion and the permanent magnet are positioned in the second direction to avoid the armature. This structural arrangement not only provides sufficient space for the armature to swing, but also allows for the individual design of the protrusion size and position of the protrusion without being limited by the armature, thus optimizing the magnetic conductivity. Accordingly, 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

[0031] Figure 1 The diagram shown is an exploded view of the relay provided in an embodiment of this utility model;

[0032] Figure 2 What is shown is Figure 1 A schematic diagram of the assembled structure;

[0033] Figures 3 to 6 The diagram shown illustrates the operational principle of the magnetic circuit structure provided in this embodiment of the present invention.

[0034] Figure 7 The diagram shown is a three-dimensional structural schematic of the magnetic circuit structure provided in an embodiment of this utility model;

[0035] Figure 8 What is shown is Figure 7 Exploded view of the central magnetic circuit structure;

[0036] Figure 9 What is shown is Figure 7 A three-dimensional schematic diagram of the middle section structure;

[0037] Figure 10 What is shown is Figure 9 A plan view of the structure;

[0038] Figure 11 What is shown is Figure 10 A planar schematic diagram of the middle structure applied to a relay;

[0039] Figure 12 The diagram shown is a second structural schematic of the magnetic circuit structure provided in this embodiment of the present invention;

[0040] Figure 13 What is shown is Figure 12 A planar schematic diagram of the middle structure applied to a relay;

[0041] Figure 14 The diagram shown is a third structural schematic of the magnetic circuit structure provided in this embodiment of the present invention;

[0042] Figure 15 What is shown is Figure 14A planar schematic diagram of the structure applied to a relay.

[0043] The annotations in the attached figures are explained as follows:

[0044] 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

[0045] 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.

[0046] This application provides a relay. Exemplarily, the relay provided in this application can be applied to a starting voltage range of 50% to 70%. Please refer to... Figure 1 and Figure 2 The relay, as shown, 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, also known as enameled wire, is wound around the surface of the coil frame 400, and the coil terminals connect 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.

[0047] As an example, such as Figure 1 and Figure 2 As shown, 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 acts 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 yokes 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.

[0048] 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.

[0049] In relay applications, such as Figure 3 As shown, the relay contains two yokes 100, one with a north (N) polarity and the other with a south (S) polarity. 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 polarity, and the other end contacts the yoke 100 with the S polarity. Figure 4 As shown, when coil 500 is energized, armature 200 generates N and S poles through excitation. Specifically, the end of armature 200 that contacts the yoke 100 with the N pole generates the N pole, and the end of armature 200 that contacts 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 armature 200 to oscillate. Figure 5 As shown, the armature 200 continues to move due to inertia in the intermediate state until the N pole end of the armature 200 attracts the opposite pole of the yoke 100 with the S pole, and at the same time, the S pole end of the armature 200 attracts the opposite pole of the yoke 100 with the N pole, accelerating the movement of the armature 200 and bringing the armature 200 into a state as shown. Figure 6 At the position shown, the contacts within the contact structure are now closed.

[0050] 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.

[0051] This application provides a magnetic circuit structure. Please refer to... Figures 7 to 15 The structure shown includes two yokes 100, an armature 200, and a permanent magnet 300. One yoke 100 has a protrusion 110 on the side facing the other yoke 100, and the protrusion 110 has an end face on the side facing the other yoke 100. It is understood that... Figure 7 The protruding buds 110 are schematically separated on the surface of the yoke 100 by dashed lines.

[0052] like Figure 7 As shown, the permanent magnet 300 is located between two yokes 100; and the permanent magnet 300 is positioned opposite the end face of the protrusion 110 on one yoke 100, and the permanent magnet 700 is in contact with the surface of the other yoke 100, so as to form a magnetic path between the end face of the protrusion 110, the permanent magnet 300 and the other yoke 100.

[0053] It is understandable that "orthogonal arrangement" means that if the protrusion 110 and the permanent magnet 300 are projected onto another yoke 100 along the first direction, the orthogonal projection of the protrusion 110 onto the yoke 100 is located within the projection of the permanent magnet 300 onto the yoke 100.

[0054] When assembling the magnetic circuit structure provided in this embodiment, the permanent magnet 300 is brought into contact with the surface of a yoke 100, and the permanent magnet 300 is positioned directly opposite the end face of the protrusion 110 on the other side of the yoke 100. Compared to the large-area contact between the permanent magnet, the yoke, and the magnetic conductor in related technologies, the assembly of the magnetic circuit structure in this embodiment is less dependent on the forming tolerances of each structural component, which can reduce the difficulty of manufacturing parts.

[0055] It is worth noting that in the magnetic circuit structure provided in this application embodiment, there is a magnetic loop, namely the main loop, between the yoke 100, armature 200, and permanent magnet 300 for maintaining or operating states. The magnetic path formed between the end face of the bulge 110, the permanent magnet 300, and another yoke 100 is part of the main loop. The magnetic circuit structure provided in this application embodiment can adjust the magnitude of the magnetic flux transmitted from the permanent magnet 300 to the yoke 100 by adjusting the opposing areas of the bulge 110 and the permanent magnet 300, as well as the distance between them, thereby changing the holding force exhibited on the yoke 100.

[0056] It should be noted that the magnetic circuit structure provided in this application embodiment forms a protrusion 110 on at least one yoke 100, which can cooperate with the permanent magnet 300 to form a magnetic conduction path, thereby reducing the number of parts in the magnetic circuit structure, simplifying the assembly steps, reducing the assembly difficulty, and improving the assembly efficiency and assembly yield.

[0057] In one embodiment, the two yokes 100 are arranged parallel and side-by-side along a first direction; please refer to [further details]. Figure 7 In the structure shown, 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.

[0058] It is worth noting that 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.

[0059] 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. It is understood that the first direction Y is approximately parallel to the thickness direction of the yoke 100, and 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 disposed on the inner side of the two yokes 100.

[0060] It should be noted that in the magnetic circuit structure provided in this application embodiment, the inner bulge 110 and the permanent magnet 300 are positioned in the second direction Z to avoid the armature 200. This structural arrangement not only provides sufficient space for the armature 200 to swing, but also allows for the individual design of the protrusion size and position of the bulge 110, without being limited by the armature 200, thus optimizing the magnetic conductivity. Accordingly, 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 structures in related technologies, the two yokes 100 in this application embodiment can be spaced apart along the first direction Y, thereby further reducing the space occupied by the magnetic circuit and achieving a compact and miniaturized relay design.

[0061] In the specific configuration of the yoke 100 in this application embodiment, only one yoke 100 may be provided with a protrusion 110, or both yoke 100 may be provided with protrusions 110. Depending on the contact position between the permanent magnet 300 and the yoke 100, the magnetic circuit structure provided in this application embodiment has at least the following structural forms.

[0062] In one embodiment, such as Figures 7 to 15 As shown, in the two yokes 100, each yoke 100 is provided with a protrusion 110; the permanent magnet 300 is in contact with one yoke 100 through the protrusion 110, and the end faces of the permanent magnet 300 and the protrusion 110 on the other yoke 100 are directly opposite each other.

[0063] Of course, when both yokes 100 are provided with protrusions 110, it can also be configured such that: the protrusion 110 on one yoke 100 is directly opposite the permanent magnet 300 in the first direction Y, and the other yoke 100 is in surface-to-surface contact with the permanent magnet 300. That is, the protrusion 110 on the other yoke 100 avoids the permanent magnet 300.

[0064] In another embodiment, of the two yokes 100, one yoke 100 is provided with a protrusion 110; the permanent magnet 300 is in contact with the yoke 100 without the protrusion 110, and the end face of the permanent magnet 300 and the protrusion 110 on the other yoke 100 are directly opposite each other. In other words, the protrusion 110 on one yoke 100 is adjacent to and directly opposite the permanent magnet 300 in the first direction Y, and the other yoke 100 without the protrusion 110 is in surface-to-surface contact with the permanent magnet 300.

[0065] In one embodiment, the end face of the protrusion 110 is spaced apart from the permanent magnet 300. In this embodiment, the size of the gap between the protrusion 110 and the permanent magnet 300, as well as their opposing areas, can be adjusted according to the required magnetic flux. Of course, the gap between the end face of the protrusion 110 and the permanent magnet 300 should not be too large to avoid failing to form an effective magnetic conduction path and affecting the magnetic conduction effect.

[0066] In another embodiment, the end face of the protrusion 110 is arranged in contact with the permanent magnet 300.

[0067] It should be noted that the magnetic conductivity of the contact arrangement in this embodiment is better controlled; the magnetic flux can be adjusted simply by controlling the size of the contact area. In other words, the size of the contact area can be adjusted according to the required magnetic flux.

[0068] 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.

[0069] Please refer to Figure 8 The structure shown takes an example where only one of the two yokes 100 has a protrusion 110. Along the third direction X, the position of the protrusion 110 can be varied, as long as the end face of the protrusion 110 is directly opposite the permanent magnet 300. Specifically, "the end face of the protrusion 110 is directly opposite the permanent magnet 300" means that the protrusion 110 and the permanent magnet 300 are not misaligned in either the second direction Z or the third direction X.

[0070] As an example, such as Figures 10 to 13 As shown, the yoke 100 has one protrusion 110, the end face of which contacts the surface of the permanent magnet 300. Further, it is preferable that the protrusion 110 contacts the permanent magnet 300 in the middle region in the third direction X. Of course, the protrusion 110 may also have a gap with the permanent magnet 300, which will not be elaborated further.

[0071] As another example, the yoke 100 has multiple protrusions 110, which are spaced apart along a third direction X, and the end face of each protrusion 110 contacts the surface of the permanent magnet 300. Figures 14 to 15 As shown, the yoke 100 has two protrusions 110, which are spaced apart along a third direction X. It is worth noting that, as... Figure 14 As shown, the positions of the two protrusions 110 can be referenced to the position of the permanent magnet 300 after assembly between the two yokes 100, so that the contact positions of the two protrusions 110 and the permanent magnet 300 are relatively uniform in the third direction X.

[0072] The protrusion 110 can be fabricated using various processes. In one embodiment, such as... Figure 10 As shown, 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 DT4E (electromagnetic pure iron) to facilitate the stamping of the protrusion 110 on the surface of the yoke 100. The material of the permanent magnet 300 can be ferrite Y33.

[0073] Or, such as Figure 12 As shown, the protrusion 110 is a raised structure provided on the surface of the yoke 100. At this time, the protrusion 110 can be prepared on the surface of the yoke 100 by casting or cutting.

[0074] 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.

[0075] 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.

[0076] Of course, when both yokes 100 are provided with protrusions 110, the number, location and preparation method of protrusions 110 on each yoke 100 can be set with reference to the above method, and will not be elaborated further.

[0077] 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.

[0078] 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.

[0079] 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 first direction Y, thereby further reducing the space occupied by the magnetic circuit and achieving a compact and miniaturized relay design.

[0080] 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.

[0081] In this embodiment, one end of the armature 200 contacts an 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; a protrusion 110 is provided on the connecting section of the yoke 100; a permanent magnet 300 is placed between the two yokes 100; the permanent magnet 300 is in contact with the surface of the connecting section of one yoke 100 and is directly opposite to the end face of the protrusion 110 provided on the connecting section of the other yoke 100.

[0082] 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.

[0083] In summary, the magnetic circuit structure provided in this application embodiment can change the magnetic flux of the two yokes 100 by controlling the size of the area of ​​the protrusion 110 and the permanent magnet 300 facing each other.

[0084] For example, in a monostable relay design, to reduce the magnetic flux transmitted from the permanent magnet 300 to the yoke 100 in the closed state, this can be achieved by reducing the area of ​​the direct contact between the permanent magnet 300 and the flange 110, thereby weakening the holding force exhibited by the yoke 100. 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. Furthermore, the magnetic flux transmitted from the permanent magnet 300 to the yoke 100 can be adjusted by regulating the direct contact area between the flange 110 and the permanent magnet 300, thereby changing the holding force (i.e., the holding force in the closed state) exhibited by the yoke 100, and thus adjusting the release voltage of the monostable product. It is understood that a larger closing holding force results in a smaller release voltage.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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, and the protrusion has an end face on the side facing the other yoke; The permanent magnet is located between the two yokes; and the end face of the permanent magnet is directly opposite to the protrusion on one of the yokes, and the permanent magnet is in contact with the surface of the other yoke, so as to form a magnetic path between the end face, the permanent magnet and the other yoke.

2. The magnetic circuit structure according to claim 1, characterized in that, In the two yokes, each yoke is provided with a protrusion; the permanent magnet is in contact with one of the yokes through the protrusion, and the end face of the permanent magnet is directly opposite the end face of the protrusion on the other yoke.

3. The magnetic circuit structure according to claim 1, characterized in that Of the two yokes, one yoke is provided with the protrusion; the permanent magnet is in contact with the yoke without the protrusion, and the end face of the permanent magnet is directly opposite the end face of the protrusion on the other yoke.

4. The magnetic circuit structure according to any one of claims 1-3, characterized in that, The end face is positioned in contact with the permanent magnet.

5. The magnetic circuit structure according to any one of claims 1 to 3, characterized in that, The end face is spaced apart from the permanent magnet.

6. The magnetic circuit structure according to any one of claims 1-3, characterized in that, The two yokes are arranged parallel to each other along a first direction; the armature is located between the two yokes; along the length of the armature, one end of the armature is arranged as a fixed fulcrum and rotates relative to the yoke, while the other end of the armature is arranged to swing 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.

7. The magnetic circuit structure according to claim 6, characterized in that, The number of protrusions provided on the yoke is one; Alternatively, the number of protrusions on the yoke may be multiple, and the multiple protrusions may be spaced apart along a third direction, which is perpendicular to the first direction and the second direction.

8. The magnetic circuit structure according to claim 6, characterized in that, The bulge is a protruding structure formed by stamping the yoke iron; Alternatively, the bulge is a protruding structure provided on the surface of the yoke.

9. The magnetic circuit structure of claim 8, wherein In a plane perpendicular to the first direction, the cross-sectional shape of the protrusion structure is rectangular, trapezoidal, or circular.

10. The magnetic circuit structure of claim 6, wherein 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.

11. The magnetic circuit structure of claim 10, wherein Each of the yokes includes two oppositely arranged extension arms and a connecting section connecting the two extension arms, the connecting section cooperating with the two extension arms 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 mounted relative to the yoke, while the other end is oscillating relative to the other extension arm of the yoke. The protrusion is provided at the connecting section of the yoke; The permanent magnet is placed between the two yokes; the permanent magnet is in contact with the surface of the connecting section of one of the yokes and is directly opposite to the end face of the protrusion on the connecting section of the other yoke.

12. The magnetic circuit structure according to claim 11, characterized in that, The extension arm is provided with a protrusion, and the side surface of the protrusion facing the armature forms the arc-shaped contact surface; Alternatively, the armature may have a protrusion, and the side surface of the protrusion facing the yoke may form the arc-shaped contact surface.

13. A relay characterized by comprising: Includes the magnetic circuit structure as described in any one of claims 1-12.

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