Magnetic circuit structure of relay and relay

Abstract

The application relates to a magnetic circuit structure of a relay and the relay. The magnetic circuit structure comprises a mounting frame body and a magnetic component; the mounting frame body encloses a magnetic circuit space; the magnetic component is arranged in the magnetic circuit space and comprises a permanent magnet and a magnetic conductor; the magnetic conductor can reciprocate relative to the permanent magnet; the permanent magnet can also move between a first position and a second position during reciprocation of the magnetic conductor; the first position and the second position are sequentially arranged along the direction of the permanent magnet and the magnetic conductor; when the magnetic conductor moves away from the permanent magnet, the permanent magnet can move from the first position to the second position; when the magnetic conductor moves towards the permanent magnet and pushes the permanent magnet, the permanent magnet can move from the second position to the first position. The relay can obtain a smaller magnetic circuit working air gap in an initial state, so that the initial attracting performance of the magnetic circuit is better; after the magnetic conductor and the permanent magnet are attracted, they move to a clapping state together and can also obtain a larger movement stroke.

Description

Technical Field

[0001] This application relates to the field of relay technology, and in particular to a magnetic circuit structure for a relay and the relay itself. Background Technology

[0002] Relays are automatic switching elements with isolation functions, widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment, and are one of the most important control elements.

[0003] With the rapid development of AI, the demand for computing power in devices has surged, leading to a significant increase in power density per rack or chip, from the original 3.2kW to 8kW or even 12kW. Higher power density often requires higher operating voltages or current ratings, which imposes stricter safety requirements on relays, such as a contact gap (with reinforced insulation) of at least 5mm. To meet this contact gap requirement, the working stroke of the relay's magnetic circuit drive mechanism must be significantly greater than 5mm. A larger working stroke means a larger initial air gap in the magnetic circuit between the iron core and the permanent magnet (magnetic steel) when the core is released, resulting in a significant increase in magnetic reluctance and consequently, low magnetic efficiency and high drive power consumption. Summary of the Invention

[0004] Therefore, it is necessary to provide a magnetic circuit structure for a relay and a relay in response to the above-mentioned technical problems.

[0005] A magnetic circuit structure for a relay, comprising:

[0006] The mounting frame encloses a space containing the magnetic circuit; and

[0007] A magnetic component is disposed in the magnetic circuit space and includes a permanent magnet and a magnetic conductor. The magnetic conductor is capable of reciprocating relative to the permanent magnet. The permanent magnet is capable of moving between a first position and a second position during the reciprocating motion of the magnetic conductor. The first position and the second position are arranged sequentially along the direction of the permanent magnet and the magnetic conductor.

[0008] When the magnetic conductor moves away from the permanent magnet, the permanent magnet can move from the first position to the second position; and when the magnetic conductor moves towards the permanent magnet and pushes against the permanent magnet, the permanent magnet can move from the second position to the first position.

[0009] In one embodiment, the magnetic circuit structure further includes an elastic element disposed in the mounting frame and connected to the permanent magnet, the elastic element being capable of providing a force to the permanent magnet toward the magnetic conductor.

[0010] When the permanent magnet is in the second position, the elastic element is in its natural state.

[0011] In one embodiment, the magnetic circuit structure further includes a guide rod disposed on the mounting frame, and the permanent magnet is sleeved on the guide rod and can slide along the guide rod.

[0012] In one embodiment, the mounting frame includes a yoke and a fixing plate. The yoke surrounds the magnetic circuit space, the fixing plate is located outside the magnetic circuit space and connected to the yoke, and the guide rod is fixed to the fixing plate and passes through the magnetic circuit space by the yoke.

[0013] When the permanent magnet is in the first position, the permanent magnet abuts against the yoke.

[0014] In one embodiment, one of the yoke and the fixing plate is provided with a first slot, and the other is provided with a first protrusion, the first protrusion being inserted into the first slot.

[0015] In one embodiment, the fixing plate is made of a non-magnetic material.

[0016] In one embodiment, the end of the guide rod away from the magnetic conductor is provided with a riveting part, the riveting part passes through the mounting frame and extends from the side of the mounting frame opposite to the magnetic conductor, wherein the outer diameter of the riveting part before extrusion deformation is smaller than the outer diameter of the guide rod.

[0017] In one embodiment, the guide rod has a stop portion at one end near the magnetic conductor, and the outer diameter of the stop portion is larger than the inner diameter of the permanent magnet;

[0018] The end of the magnetic conductor facing the permanent magnet is provided with a receiving groove, and the depth of the receiving groove is greater than or equal to the axial length of the stop portion.

[0019] In one embodiment, the elastic element is fitted onto the guide rod and abuts against the mounting frame and the permanent magnet.

[0020] In one embodiment, there are two permanent magnets, which are distributed opposite to each other.

[0021] The magnetic circuit structure also includes a coil assembly, which is fixedly disposed relative to the mounting frame and surrounds the outer periphery of the magnetic component. The coil assembly is capable of driving the magnetic conductor to move between the two permanent magnets.

[0022] In one embodiment, the coil assembly includes two coil units, each coil unit having an axially extending coil space for placing the corresponding permanent magnet and for the movable assembly of the corresponding axial end of the magnetic conductor.

[0023] In one embodiment, the permanent magnet is a magnetic steel; and / or, the magnetic conductor is an iron core.

[0024] A relay comprising the magnetic circuit structure as described in any of the preceding claims.

[0025] The magnetic circuit structure and relay described above, by setting the permanent magnet to be able to move in the first position and the second position, can not only obtain a small working air gap in the initial state, so that the initial attraction performance of the magnetic circuit is good, but also obtain a large motion stroke after the magnetic conductor and the permanent magnet are attracted and move together to the engagement state. That is, the actual working stroke is distributed to a small working air gap and actuation stroke, so as to significantly improve the initial working efficiency of the magnetic circuit when the working stroke requirement is large. Attached Figure Description

[0026] Figure 1 and Figure 2 This is a schematic diagram of the magnetic circuit structure of a relay provided in an embodiment of the present application when the first permanent magnet is in the first position and the second permanent magnet is in the second position.

[0027] Figure 3 for Figure 2 The provided relay's magnetic circuit structure is shown in cross-sectional view at point AA.

[0028] Figure 4 for Figure 1 A schematic diagram of the first guide rod of the provided magnetic circuit structure.

[0029] Figure 5 for Figure 1 A cross-sectional view of the magnetic conductor in the provided magnetic circuit structure.

[0030] Figure 6 for Figure 1 A schematic diagram of the structure of the first yoke plate provided.

[0031] Figure 7 for Figure 1 A schematic diagram of the structure of the second yoke plate provided.

[0032] Figure 8 for Figure 1 A schematic diagram of the structure of the first fixing plate is provided.

[0033] The labels in the attached diagram are explained as follows:

[0034] 10. Magnetic circuit structure; 100. Mounting frame; 110. Yoke; 111. First yoke plate; 1111. First slot; 1112. Second slot; 112. Second yoke plate; 1121. Second rib; 1122. First through hole; 120. First fixing plate; 121. First rib; 122. Second through hole; 130. Second fixing plate; 100a. Magnetic circuit space; 200. Magnetic component; 210. First permanent magnet; 220. Second permanent magnet; 230. Magnetic conductor; 231. Receiving groove; 300. First elastic element; 400. Second elastic element; 500. First guide rod; 510. Riveting part; 520. Stop part; 600. Second guide rod; 700. Coil assembly; 710. First coil unit; 720. Second coil unit. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that if 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", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0041] See Figures 1 to 3 One embodiment of this application provides a magnetic circuit structure 10 for a relay. The magnetic circuit structure 10 includes a mounting frame 100 and a magnetic component 200. The mounting frame 100 encloses a magnetic circuit space 100a. The magnetic component 200 is disposed in the magnetic circuit space 100a and includes a permanent magnet and a magnetic conductor 230. The permanent magnet can drive the magnetic conductor 230 to reciprocate relative to the permanent magnet. During the reciprocating motion of the magnetic conductor 230, the permanent magnet can move between a first position and a second position. The first position and the second position are arranged sequentially along the direction of the permanent magnet and the magnetic conductor 230. When the magnetic conductor 230 moves away from the permanent magnet, the permanent magnet can move from the first position to the second position. When the magnetic conductor 230 moves towards the permanent magnet and pushes against the permanent magnet, the permanent magnet can move from the second position to the first position.

[0042] The magnetic circuit structure 10 can be applied to a magnetic latching relay, which may include a transmission component, a moving component, and a contact system. The magnetic circuit structure 10 can drive the moving component to move by driving the transmission component, thereby enabling the contact system to switch between a closed state and an open state.

[0043] To meet the time requirements of high-computing devices such as AI servers, this application employs a dual-drive magnetic circuit structure to significantly shorten the switching time. For example... Figures 1 to 3 As shown, there are two permanent magnets, namely a first permanent magnet 210 and a second permanent magnet 220, which are distributed opposite to each other. The magnetic circuit structure 10 also includes a coil assembly 700, which is fixedly disposed relative to the mounting frame 100 and surrounds the outer periphery of the magnetic assembly 200. The coil assembly 700 can drive the magnetic conductor 230 to move between the first permanent magnet 210 and the second permanent magnet 220. It should be noted that... Figure 3 The coil assembly 700 is not shown in the figure.

[0044] Optionally, the coil assembly 700 includes two coil units, namely a first coil unit 710 and a second coil unit 720. Each coil unit has an axially extending coil space for placing the corresponding permanent magnet and for the movable assembly of the corresponding axial end of the magnetic conductor. This eliminates the need to design each coil unit to be excessively long along the axial direction, saving material costs.

[0045] When a current in a specific direction is applied to the coil assembly 700, the magnetic conductor 230 is magnetized, causing the end of it near the first permanent magnet 210 (or the second permanent magnet 220) to have the same polarity as the end of the first permanent magnet 210 (or the second permanent magnet 220) near the magnetic conductor 230, thus generating an electromagnetic repulsion force. Simultaneously, the end of it near the second permanent magnet 220 (or the first permanent magnet 210) has the opposite polarity to the end of the second permanent magnet 220 (or the first permanent magnet 210) near the magnetic conductor 230, thus generating an electromagnetic attraction force. The electromagnetic attraction and repulsion forces are in the same direction and act together on the magnetic conductor 230, causing it to move under the combined effect of these two forces. This enables rapid movement of the magnetic conductor 230, thereby driving the contacts to complete switching, with a switching speed as fast as 40ms.

[0046] During the reciprocating linear motion of the magnetic conductor 230, both the first permanent magnet 210 and the second permanent magnet 220 move between a first position and a second position. The following description, taking the initial state where the first permanent magnet 210 is in the first position and the second permanent magnet 220 is in the second position, will detail how the first permanent magnet 210 and the second permanent magnet 220 move. It is understood that the first position and the second position of the first permanent magnet 210 and the second permanent magnet 220 are different positions, and also different positions.

[0047] In the initial state, the first permanent magnet 210 is located in the first position and abuts against the mounting frame 100 and the magnetic conductor 230, while the second permanent magnet 220 is located in the second position and away from the mounting frame 100, thus allowing it to get closer to the magnetic conductor 230 and reducing the working air gap between the second permanent magnet 220 and the magnetic conductor 230. When a current in a specific direction is applied to the coil assembly, energizing the magnetic conductor 230, the magnetic conductor 230 moves towards the second permanent magnet 220 under the magnetic repulsion of the first permanent magnet 210 and the magnetic attraction of the second permanent magnet 220. At the same time, the first permanent magnet 210 moves from the first position to the second position to reduce the working air gap between the first permanent magnet 210 and the magnetic conductor 230. After the magnetic conductor 230 collides with the second permanent magnet 220, the second permanent magnet 220 also moves from the second position to the first position, allowing the magnetic conductor 230 to continue moving in the current direction, which increases the working stroke of the magnetic conductor 230. When a current in the opposite direction is applied to the coil assembly, the magnetic conductor 230 moves toward the first permanent magnet 210, and the first permanent magnet 210 and the second permanent magnet 220 also move accordingly.

[0048] As can be seen, the magnetic circuit structure 10 provided in this application, by setting the permanent magnet to be able to move in the first position and the second position, can not only obtain a small working air gap in the initial state, so that the initial attraction performance of the magnetic circuit is better, but also obtain a large motion stroke after the magnetic conductor 230 and the permanent magnet are attracted and move together to the engagement state. That is, the actual working stroke is distributed to a small working air gap and motion stroke, so as to significantly improve the initial working efficiency of the magnetic circuit under the large working stroke requirement.

[0049] In some embodiments of this application, the permanent magnet is a magnetic steel and the magnetic conductor 230 is an iron core.

[0050] In some embodiments of this application, the magnetic circuit structure 10 further includes an elastic element disposed in the mounting frame 100 and connected to the permanent magnet. The elastic element is capable of providing a force to the permanent magnet toward the guide magnet 230.

[0051] As an example, such as Figures 1 to 3As shown, there are two elastic elements: a first elastic element 300 and a second elastic element 400. The first elastic element 300 is connected to the first permanent magnet 210, and the second elastic element 400 is connected to the second permanent magnet 220. In the initial state, the first permanent magnet 210 compresses the first elastic element 300 due to the pushing force of the magnetic conductor 230, causing the first elastic element 300 to deform. Meanwhile, the second permanent magnet 220, being away from the magnetic conductor 230, keeps the second elastic element 400 in its natural state. When current is applied to the coil assembly and the magnetic conductor 230 is energized, the magnetic conductor 230 moves away from the first permanent magnet 210 and toward the second permanent magnet 220. During the movement of the magnetic conductor 230, the first elastic element 300 resets, pushing the first permanent magnet 210 toward the magnetic conductor 230, providing assistance to the movement of the magnetic conductor 230, which can further shorten the switching time of the relay. After the magnetic conductor 230 collides with the second permanent magnet 220, the magnetic conductor 230 compresses the second elastic element 400 and continues to move in the original direction. At this time, the second elastic element 400 absorbs the impact force exerted by the magnetic conductor 230 on the second permanent magnet 220 due to deformation, buffering the impact of the magnetic conductor 230 on the second permanent magnet 220, reducing the risk of permanent magnet brittle fracture, and avoiding failure of the magnetic circuit function.

[0052] Furthermore, the magnetic circuit structure 10 also includes a guide rod disposed on the mounting frame 100, with the permanent magnet sleeved on the guide rod and capable of sliding along it. The guide rod enables the permanent magnet to move in a directional manner, effectively driving the magnetic conductor 230 to reciprocate linearly. See, as an example... Figures 1 to 3 There are two guide rods, namely the first guide rod 500 and the second guide rod 600. The first guide rod 500 is used to install the first permanent magnet 210, and the second guide rod 600 is used to install the second permanent magnet 220.

[0053] In one embodiment, such as Figure 4 As shown, the end of the first guide rod 500 away from the first magnetic conductor 230 is provided with a riveting portion 510. The riveting portion 510 passes through the mounting frame 100 and extends from the side of the mounting frame 100 opposite to the first magnetic conductor 230. The outer diameter of the riveting portion 510 before compression deformation is smaller than the outer diameter of the first guide rod 500. Under the action of external force, the riveting portion 510 can deform to form a head, which cooperates with the first guide rod 500 to clamp the first guide rod 500 onto the mounting frame 100.

[0054] See also Figure 4 The first guide rod 500 has a stop portion 520 at one end near the magnetic conductor 230, and the outer diameter of the stop portion 520 is larger than the inner diameter of the first permanent magnet 210; see also Figure 5The end of the magnetic conductor 230 facing the first permanent magnet 210 is provided with a receiving groove 231, the depth of which is greater than or equal to the axial length of the stop portion 520. The stop portion 520 can limit the first permanent magnet 210 to prevent it from falling off the first guide rod 500. In addition, by limiting the relationship between the depth of the receiving groove 231 and the axial length of the stop portion 520, it can be ensured that the magnetic conductor 230 can collide with the first permanent magnet 210, so that the first permanent magnet 210 can move from the second position to the first position.

[0055] The first guide rod 500, the riveting part 510, and the stop part 520 can be an integral structure. This ensures the connection strength between these three components.

[0056] The second guide rod 600 can have the same structure as the first guide rod 500, or it can be different.

[0057] like Figures 1 to 3 As shown, in one embodiment, the first elastic element 300 is sleeved on the first guide rod 500 and abuts against the mounting frame 100 and the first permanent magnet 210. This arrangement facilitates the installation of the first elastic element 300 and reduces the number of first elastic elements 300. Of course, in other embodiments, there may be multiple first elastic elements 300, which are spaced apart circumferentially along the first guide rod 500, and each first elastic element 300 is connected between the mounting frame 100 and the first permanent magnet 210. The first elastic element 300 may be a spring.

[0058] The installation method, quantity, and structure of the second elastic element 400 can be the same as those of the first elastic element 300, or they can be different.

[0059] See Figures 1 to 3 In some embodiments of this application, the mounting frame 100 includes a yoke 110 and a fixing plate. The yoke 110 forms a magnetic circuit space 100a. The fixing plate is located outside the magnetic circuit space 100a and connected to the yoke 110. A guide rod is fixed on the fixing plate and passes through the magnetic circuit space 100a via the yoke 110. When the permanent magnet is in the first position, it abuts against the yoke 110. If the guide rod is directly installed on the side of the yoke 110 facing the guide magnet 230, the elastic element will be entirely located in the magnetic circuit space 100a, interfering with the movement of the permanent magnet. This would prevent the permanent magnet from contacting the yoke 110 under the impact of the guide magnet 230, resulting in a short stroke of the guide magnet 230. To address this, this application uses a fixing plate to install the guide rod outside the yoke 110, allowing the permanent magnet to abut against the yoke 110 under the impact of the guide magnet 230, thereby increasing the stroke of the guide magnet 230.

[0060] Among them, the yoke 110 can be a split structure, such as Figures 1 to 3As shown, the device may include two first yoke plates 111 and two second yoke plates 112. The two first yoke plates 111 are arranged opposite each other in a first direction, and the two second yoke plates 112 are arranged opposite each other in a second direction, with each second yoke plate 112 connected between the two first yoke plates 111. The first direction is perpendicular to the reciprocating linear motion direction of the magnetic conductor 230, and the second direction is parallel to the reciprocating linear motion direction of the magnetic conductor 230. It is understood that each second yoke plate 112 has a first through hole 1122 for a corresponding guide rod and elastic element to pass through (see...). Figure 7 ).

[0061] Of course, in some other embodiments, the yoke 110 may also be an integral structure.

[0062] Optionally, see Figure 7 The second yoke plate 112 has a second protruding rib 1121 at its longitudinal end, and the first yoke plate 111 has a second slot 1112 at its longitudinal end (see...). Figure 6 The second protruding rib 1121 is inserted into the second slot 1112.

[0063] like Figures 1 to 3 As shown, two fixing plates are provided, namely a first fixing plate 120 and a second fixing plate 130. The first fixing plate 120 and the second fixing plate 130 are arranged on both sides of the yoke 110 along the movement direction of the magnetic conductor 230. The first fixing plate 120 is used to install the first guide rod 500, and the second fixing plate 130 is used to install the second guide rod 600. Among them, the first fixing plate 120 has a second through hole 122 for the riveting part 510 of the first guide rod 500 to pass through (see Figure 8 The second fixing plate 130 has a third through hole through which the riveting part 510 of the second guide rod 600 passes.

[0064] The first fixing plate 120 can also be installed on the first yoke plate 111 by means of a slot and a rib. Specifically, for example... Figure 6 As shown, the first yoke plate 111 is provided with a first slot 1111 at its longitudinal end, and the first fixing plate 120 is provided with a first rib 121 at its longitudinal end (see Figure 121). Figure 8 The first protruding rib 121 is inserted into the first slot 1111. This arrangement facilitates the assembly and disassembly of the first fixing plate 120. Of course, in some other embodiments, the first fixing plate 120 is provided with the first slot 1111, and the first yoke plate 111 is provided with the first protruding rib 121.

[0065] The second fixing plate 130 is installed on the first yoke plate 111 in the same way as the first fixing plate 120. Of course, it can also be installed differently, for example, by welding, screwing or other methods.

[0066] Both the first fixing plate 120 and the second fixing plate 130 are made of non-magnetic materials, such as plastic. This arrangement can prevent the formation of magnetic short circuits between the first fixing plate 120 and the yoke 110, and between the second fixing plate 130 and the yoke 110.

[0067] On the other hand, one embodiment of this application also provides a relay, which includes a magnetic circuit structure 10, a transmission member, a moving member, and a contact system. The transmission member is connected to a magnetic conductor 230, the moving member is connected to the transmission member, and the moving member can drive the contact system to switch between a closed state and an open state.

[0068] The relay can be a DC relay or a converter relay. To meet the time requirements of high-computing-power devices such as AI servers, this application employs a dual-drive magnetic circuit structure 10 to significantly shorten the switching time. Figures 1 to 3 As shown, there are two permanent magnets, namely a first permanent magnet 210 and a second permanent magnet 220, which are distributed opposite to each other. The magnetic circuit structure 10 also includes a coil assembly 700, which is fixedly disposed relative to the mounting frame 100 and surrounds the outer periphery of the magnetic assembly 200. The coil assembly 700 can drive the magnetic conductor 230 to move between the first permanent magnet 210 and the second permanent magnet 220.

[0069] During the reciprocating linear motion of the magnetic conductor 230 in the magnetic circuit structure 10, both the first permanent magnet 210 and the second permanent magnet 220 move between the first position and the second position. The following is a detailed description of how the first permanent magnet 210 and the second permanent magnet 220 operate, taking the initial state in which the first permanent magnet 210 is in the first position and the second permanent magnet 220 is in the second position as an example.

[0070] In the initial state, the first permanent magnet 210 is located in the first position and abuts against the mounting frame 100 and the magnetic conductor 230, while the second permanent magnet 220 is located in the second position and away from the mounting frame 100, allowing it to get closer to the magnetic conductor 230, thus reducing the working air gap between the second permanent magnet 220 and the magnetic conductor 230. When a current in a specific direction is applied to the coil assembly, energizing the magnetic conductor 230, the magnetic conductor 230 moves towards the second permanent magnet 220 under the magnetic repulsion of the first permanent magnet 210 and the magnetic attraction of the second permanent magnet 220. Simultaneously, the first permanent magnet 210 moves from the first position to the second position to further reduce the working air gap between the first permanent magnet 210 and the magnetic conductor 230. After the magnetic conductor 230 collides with the second permanent magnet 220, the second permanent magnet 220 also moves from the second position to the first position, allowing the magnetic conductor 230 to continue moving in the current direction, which increases the working stroke of the magnetic conductor 230. When a current in the opposite direction is applied to the coil assembly, the magnetic conductor 230 moves toward the first permanent magnet 210, and the first permanent magnet 210 and the second permanent magnet 220 also move accordingly.

[0071] As can be seen, the relay provided in this application, by setting the permanent magnet of the magnetic circuit structure 10 to be able to move in the first position and the second position, can not only obtain a small working air gap in the initial state, so that the initial attraction performance of the magnetic circuit is better, but also obtain a large movement stroke after the magnetic conductor 230 and the permanent magnet are attracted to each other and move together to the engagement state. That is, the actual working stroke is distributed to a small working air gap and actuation stroke, so as to significantly improve the initial working efficiency of the magnetic circuit under the large working stroke requirement.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A magnetic circuit structure for a relay, characterized in that, include: The mounting frame is used to enclose the space containing the magnetic circuit. as well as A magnetic component is disposed in the magnetic circuit space and includes a permanent magnet and a magnetic conductor. The magnetic conductor is capable of reciprocating relative to the permanent magnet. The permanent magnet is capable of moving between a first position and a second position during the reciprocating motion of the magnetic conductor. The first position and the second position are arranged sequentially along the direction of the permanent magnet and the magnetic conductor. When the magnetic conductor moves away from the permanent magnet, the permanent magnet can move from the first position to the second position; and when the magnetic conductor moves towards the permanent magnet and pushes against the permanent magnet, the permanent magnet can move from the second position to the first position.

2. The magnetic circuit structure according to claim 1, characterized in that, The magnetic circuit structure also includes an elastic element, which is disposed in the mounting frame and connected to the permanent magnet. The elastic element can provide the permanent magnet with a force that moves toward the magnetic conductor. When the permanent magnet is in the second position, the elastic element is in its natural state.

3. The magnetic circuit structure according to claim 2, characterized in that, The magnetic circuit structure also includes a guide rod disposed on the mounting frame, and the permanent magnet is sleeved on the guide rod and can slide along the guide rod.

4. The magnetic circuit structure according to claim 3, characterized in that, The mounting frame includes a yoke and a fixing plate. The yoke encloses the magnetic circuit space. The fixing plate is located outside the magnetic circuit space and connected to the yoke. The guide rod is fixed on the fixing plate and passes through the magnetic circuit space via the yoke. When the permanent magnet is in the first position, the permanent magnet abuts against the yoke.

5. The magnetic circuit structure according to claim 4, characterized in that, One of the yoke and the fixing plate is provided with a first slot, and the other is provided with a first protruding rib, which is inserted into the first slot.

6. The magnetic circuit structure according to claim 4, characterized in that, The fixing plate is made of non-magnetic material.

7. The magnetic circuit structure according to claim 3, characterized in that, The guide rod has a riveting part at the end away from the magnetic conductor. The riveting part passes through the mounting frame and extends from the side of the mounting frame opposite to the magnetic conductor. The outer diameter of the riveting part before extrusion deformation is smaller than the outer diameter of the guide rod.

8. The magnetic circuit structure according to claim 3, characterized in that, The guide rod has a stop portion at one end near the magnetic conductor, and the outer diameter of the stop portion is larger than the inner diameter of the permanent magnet. The end of the magnetic conductor facing the permanent magnet is provided with a receiving groove, and the depth of the receiving groove is greater than or equal to the axial length of the stop portion.

9. The magnetic circuit structure according to claim 3, characterized in that, The elastic element is fitted onto the guide rod and abuts against the mounting frame and the permanent magnet.

10. The magnetic circuit structure according to any one of claims 1 to 9, characterized in that, The permanent magnet is provided in two parts, and the two permanent magnets are distributed relative to each other; The magnetic circuit structure also includes a coil assembly, which is fixedly disposed relative to the mounting frame and surrounds the outer periphery of the magnetic component. The coil assembly is capable of driving the magnetic conductor to move between the two permanent magnets.

11. The magnetic circuit structure according to claim 10, characterized in that, The coil assembly includes two coil units, each coil unit having an axially extending coil space for placing the corresponding permanent magnet and for the movable assembly of the corresponding axial end of the magnetic conductor.

12. The magnetic circuit structure according to any one of claims 1 to 9, characterized in that, The permanent magnet is a magnetic steel; and / or the magnetic conductor is an iron core.

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

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