Electromagnetic driving mechanism and high-voltage direct-current relay

Abstract

The present application relates to an electromagnetic driving mechanism (10) and a high-voltage direct-current relay. The electromagnetic driving mechanism (10) comprises a coil, a static magnetic conductive member (11), and a movable magnetic conductive member (12). The static magnetic conductive member (11) is provided with a first magnetic pole face (111). The movable magnetic conductive member (12) is provided with a second magnetic pole face (121) opposite to the first magnetic pole face (111). The coil is fixed relative to the static magnetic conductive member (11) and is arranged circumferentially around the movable magnetic conductive member (12). The movable magnetic conductive member (12) can move relative to the coil to approach or move away from the static magnetic conductive member (11). The vertical distance between part of the surface of the first magnetic pole face (111) and part of the surface of the second magnetic pole face (121) is greater than the vertical distance between the remaining parts of said surfaces.

Description

Electromagnetic drive mechanism and high-voltage DC relay

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 2024225054762, filed on October 16, 2024, entitled "Electromagnetic Drive Mechanism and High Voltage DC Relay", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of relay technology, and in particular to an electromagnetic drive mechanism and a high-voltage DC relay. Background Technology

[0004] A relay is an electronic control device with a control system (also known as an input circuit) and a controlled system (also known as an output circuit). Relays are commonly used in automatic control circuits, playing roles such as automatic adjustment, safety protection, and circuit switching. High-voltage DC relays are a common type of relay. When the electromagnetic drive mechanism is used in a high-voltage DC relay, it is also called the magnetic circuit part, used to drive the contact parts of the high-voltage DC relay to perform switching actions. The moving and stationary iron cores of the electromagnetic drive mechanism can be attracted together under magnetic force to drive the contact parts of the high-voltage DC relay to make contact.

[0005] As the applications of high-voltage DC relays continue to expand, the industry's requirements for the electromagnetic attraction between the moving and stationary iron cores are also increasing. By improving the electromagnetic attraction between the moving and stationary iron cores, the voltage at which they engage can be reduced, thus lowering the coil's power consumption. However, in traditional electromagnetic drive mechanisms, the holding force of the moving and stationary iron cores after engagement is insufficient, making it difficult to meet the application requirements. Summary of the Invention

[0006] According to various embodiments of this application, an electromagnetic drive mechanism and a high-voltage DC relay are provided.

[0007] An electromagnetic drive mechanism includes a stationary magnetic conductor, a moving magnetic conductor, and a coil. The stationary magnetic conductor has a first magnetic pole surface. The moving magnetic conductor has a second magnetic pole surface opposite to the first magnetic pole surface. The coil is fixed relative to the stationary magnetic conductor and is arranged circumferentially around the moving magnetic conductor; the moving magnetic conductor is movable relative to the coil to move closer to or further away from the stationary magnetic conductor; the vertical distance between a portion of the surfaces of the first and second magnetic pole surfaces is greater than the vertical distance between the remaining surfaces.

[0008] In the aforementioned electromagnetic drive mechanism, because the vertical distance between a portion of the surfaces of the first and second magnetic pole surfaces is greater than the vertical distance between the remaining surfaces, when the first and second magnetic pole surfaces attract each other, the portions with larger vertical distances will not directly contact each other. Therefore, when the stationary and moving magnetic components attract each other, the contact area between the first and second magnetic pole surfaces is reduced, which helps to increase the magnetic density when the first and second magnetic pole surfaces attract each other, thereby improving the magnetic holding force when the stationary and moving magnetic components attract each other. In one embodiment, at least one of the first and second magnetic pole surfaces is provided with a groove.

[0009] In one embodiment, the first magnetic pole surface has a central portion and a peripheral portion surrounding the central portion, and the second magnetic pole surface has a central portion and a peripheral portion surrounding the central portion. The distance between the central portions of the first and second magnetic pole surfaces is greater than the distance between the peripheral portions of the first and second magnetic pole surfaces. This allows for the rational planning of the contact positions of the moving and stationary magnetic components during attraction, improving both the holding force and the uniformity of the attraction force, thus enhancing the performance stability and structural reliability of the electromagnetic drive mechanism.

[0010] In one embodiment, at least one of the first magnetic pole surface and the second magnetic pole surface is provided with a groove, the bottom wall of the groove forms the middle portion, and the peripheral portion is disposed around the groove.

[0011] In one embodiment, the first magnetic pole surface is a flat surface, and the second magnetic pole surface has a groove; or...

[0012] The first magnetic pole surface has a groove, and the second magnetic pole surface is a flat surface; or...

[0013] Both the first magnetic pole surface and the second magnetic pole surface are provided with grooves, and the grooves on the first magnetic pole surface and the second magnetic pole surface are opposite to each other.

[0014] In one embodiment, the first magnetic pole surface of the stationary magnetic component has a first receiving groove, and the second magnetic pole surface of the moving magnetic component has a second receiving groove opposite to the first receiving groove. The electromagnetic drive mechanism further includes an elastic element, with its two ends respectively disposed in the first receiving groove and the second receiving groove. The elastic element can be compressed when the moving magnetic component and the stationary magnetic component approach each other. This allows for a more rational planning of the layout of the grooves and holes, improving space utilization efficiency and reducing the impact of the grooves and slots on the structural strength and electromagnetic attraction of the moving and stationary magnetic components.

[0015] In one embodiment, when the first magnetic pole surface is provided with the groove, the first receiving groove is formed in the middle of the first magnetic pole surface and communicates with the groove; when the second magnetic pole surface is provided with the groove, the second receiving groove is formed in the middle of the second magnetic pole surface and communicates with the groove.

[0016] In one embodiment, the moving magnetic component includes a moving core body and an amplification portion connected to the moving core body. The amplification portion surrounds one end of the moving core body facing the stationary magnetic component and is disposed around the moving core body. The surfaces of the moving core body and the amplification portion facing the stationary magnetic component together constitute the second magnetic pole surface. The projection of the first magnetic pole surface onto the second magnetic pole surface approximately coincides with the second magnetic pole surface. By increasing the relative area of ​​the first and second magnetic pole surfaces, the electromagnetic attraction between the moving and stationary magnetic components can be enhanced. Furthermore, the design that the vertical distance between some surfaces of the first and second magnetic pole surfaces is greater than the vertical distance between the remaining surfaces also helps to improve the holding force after attraction.

[0017] In one embodiment, the moving core body has a groove on the side facing the stationary magnetic conductor; or,

[0018] The surface of the amplification section facing the static magnetic component protrudes towards the side where the static magnetic component is located, relative to the surface of the moving core body facing the static magnetic component. The inner circumferential surface of the amplification section and the surface of the moving core body facing the static magnetic component form a groove.

[0019] In one embodiment, the electromagnetic drive mechanism further includes a magnetically conductive connector and a magnetic circuit constraint member, the moving magnetically conductive member being located between the magnetically conductive connector and the magnetic circuit constraint member, and the stationary magnetically conductive member being disposed on the side of the magnetically conductive connector facing the moving magnetically conductive member;

[0020] Alternatively, the electromagnetic drive mechanism may further include a magnetic circuit constraint member, wherein the stationary magnetic conductor is connected to the magnetic circuit constraint member, and the moving magnetic conductor is located between the stationary magnetic conductor and the magnetic circuit constraint member.

[0021] A high-voltage DC relay includes a contact portion and an electromagnetic drive mechanism as described in any of the above embodiments, wherein the mutual approach or separation of the stationary and moving magnetic components of the electromagnetic drive mechanism can drive the contact portion to close or open.

[0022] Details of one or more embodiments of the present invention are set forth in the following drawings and description. Other features, objects, and advantages of the invention will become apparent from the specification, drawings, and claims. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0024] Figure 1 is a schematic diagram of the electromagnetic drive mechanism in some embodiments.

[0025] Figure 2 is an exploded schematic diagram of the electromagnetic drive mechanism shown in Figure 1.

[0026] Figure 3 is a cross-sectional schematic diagram of the electromagnetic drive mechanism shown in Figure 1 along the AA direction.

[0027] Figure 4 is a partially enlarged schematic diagram of the area within the dashed box of the electromagnetic drive mechanism shown in Figure 3.

[0028] Figure 5 is a schematic diagram of the structure of the static magnetic conductor and the dynamic magnetic conductor in some embodiments.

[0029] Figure 6 is a partially enlarged schematic diagram of the electromagnetic drive mechanism in some embodiments where both the first and second magnetic pole surfaces are provided with grooves.

[0030] Figure 7 is a partially enlarged schematic diagram of the electromagnetic drive mechanism when the second magnetic pole surface is provided with a groove in some embodiments. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In traditional high-voltage DC relays, the electromagnetic drive mechanism typically requires increasing the area of ​​the opposing magnetic pole surfaces of the moving and stationary iron cores to enhance the electromagnetic attraction between them and reduce coil power consumption. However, this increased area can lead to a decrease in magnetic density when the moving and stationary iron cores attract each other, thus reducing the holding force after attraction and making it difficult to meet application requirements.

[0038] To address the aforementioned problems, this application provides an electromagnetic drive mechanism and a high-voltage DC relay.

[0039] Please refer to Figures 1, 2, and 3. Figures 1 and 2 are schematic diagrams of the structure and exploded views of the electromagnetic drive mechanism 10 in some embodiments of this application, respectively. Figure 3 is a cross-sectional view of the electromagnetic drive mechanism 10 shown in Figure 1 along the AA direction. The electromagnetic drive mechanism 10 provided in this application includes, but is not limited to, applications in any suitable electronic components that convert electromagnetic energy into mechanical energy, such as high-voltage DC relays and solenoid valves. In this application, the electromagnetic drive mechanism 10 is used in a high-voltage DC relay as an example. The electromagnetic drive mechanism 10 includes a stationary magnetic conductor 11 and a moving magnetic conductor 12. The stationary magnetic conductor 11 has a first magnetic pole surface 111, and the moving magnetic conductor 12 has a second magnetic pole surface 121 opposite to the first magnetic pole surface 111. The stationary magnetic conductor 11 and the moving magnetic conductor 12 can move closer to or further away from each other. When the moving magnetic component 12 approaches the stationary magnetic component 11 under the action of electromagnetic attraction until the moving magnetic component 12 and the stationary magnetic component 11 come into contact with each other, the first magnetic pole surface 111 and the second magnetic pole surface 121 come into contact and maintain a state of mutual attraction under the action of electromagnetic holding force.

[0040] The high-voltage DC relay involved in this application may include a contact portion (not shown in the figure) for realizing a switching function. The contact portion may be connected to the moving magnetic element 12. The mutual approach of the moving magnetic element 12 and the stationary magnetic element 11 can drive the contact portion to contact and close. The mutual separation of the moving magnetic element 12 and the stationary magnetic element 11 can drive the contact portion to separate and open, thereby realizing the switching action of the contact portion to realize the conduction or disconnection of the electrical circuit.

[0041] In some embodiments, the electromagnetic drive mechanism 10 further includes a frame (not shown), a coil (not shown), an elastic element 13, and a sealing cylinder 14. The coil is wound around the frame, and the frame has a through hole. The moving magnetic element 12 is slidably disposed in the through hole of the frame, and the stationary magnetic element 11 is fixedly disposed at one end of the through hole and opposite to the moving magnetic element 12. The elastic element 13 includes, but is not limited to, a spring, and its two ends abut against the moving magnetic element 12 and the stationary magnetic element 11, respectively. It is understood that when a current is applied to the coil, the stationary magnetic element 11 and the moving magnetic element 12 are magnetized and generate an electromagnetic attraction force between them, which can drive the moving magnetic element 12 to move toward the stationary magnetic element 11 until the first magnetic pole surface 111 and the second magnetic pole surface 121 come into contact. As the moving magnetic element 12 and the stationary magnetic element 11 approach each other, they compress the elastic element 13. When the holding force between the moving magnetic element 12 and the stationary magnetic element 11 is too small or disappears, the elastic restoring force of the elastic element 13 provides a restoring force to the moving magnetic element 12, driving the moving magnetic element 12 to move away from the stationary magnetic element 11. The sealing cylinder 14 covers the moving magnetic element 12 to protect it and limit its sliding stroke relative to the stationary magnetic element 11. In some embodiments, the sealing cylinder 14 can form a sealed space that encloses the moving magnetic element 12 and the stationary magnetic element 11, providing a sealing effect for them.

[0042] In some embodiments, the electromagnetic drive mechanism 10 further includes a magnetically conductive connector 15, a magnetic circuit constraint member 16, and a magnetically conductive cylinder 17. The magnetically conductive connector 15 includes, but is not limited to, a yoke plate, and the magnetic circuit constraint member 16 includes, but is not limited to, a U-shaped yoke. The magnetically conductive connector 15 is connected to both ends of the magnetic circuit constraint member 16 and together with the magnetic circuit constraint member 16 forms a square frame shape. The magnetically conductive connector 15 and the magnetic circuit constraint member 16 together surround the frame and the coil. The stationary magnetically conductive member 11 is fixedly disposed on the magnetically conductive connector 15, and the movable magnetically conductive member 12 can slide within the space formed by the magnetically conductive connector 15 and the magnetic circuit constraint member 16. The magnetically conductive connector 15 and the magnetic circuit constraint member 16 can jointly seal the magnetic lines of force generated by the coil, thereby enhancing the electromagnetic attraction between the movable magnetically conductive member 12 and the stationary magnetically conductive member 11 when the coil is energized. The magnetic cylinder 17 is located between the frame and the moving magnetic element 12. For example, the magnetic cylinder 17 surrounds the moving magnetic element 12, and the moving magnetic element 12 is slidably disposed inside the magnetic cylinder 17. The frame is sleeved around the outer periphery of the magnetic cylinder 17. The magnetic cylinder 17 can enhance the magnetic field generated by the coil and guide the direction of the magnetic field. At the same time, it helps to reduce the magnetic resistance in the magnetic circuit, thereby improving the magnetic field utilization efficiency and enhancing the electromagnetic attraction between the moving magnetic element 12 and the stationary magnetic element 11.

[0043] It should be noted that the above-mentioned components and their interrelationships are merely examples to facilitate understanding of the function of the electromagnetic drive mechanism 10 of this application. The component composition and structural layout of the electromagnetic drive mechanism 10 are not limited to those described above. As long as the static magnetic conductor 11 and the dynamic magnetic conductor 12 can approach each other under the action of electromagnetic attraction to achieve contact closure of the contact part, it is acceptable.

[0044] Furthermore, referring to Figures 3 and 4, in some embodiments, the vertical distance between a portion of the surfaces of the first magnetic pole surface 111 and the second magnetic pole surface 121 is greater than the vertical distance between the remaining surfaces. That is, the distance between a portion of the surface of the first magnetic pole surface 111 and a portion of the surface of the second magnetic pole surface 121 opposite to that portion is greater than the distance between the remaining surfaces of the first magnetic pole surface 111 and the remaining surfaces of the second magnetic pole surface 121 opposite to that portion. With this configuration, when the moving magnetic component 12 moves towards the stationary magnetic component 11 under the action of electromagnetic attraction until the first magnetic pole surface 111 and the second magnetic pole surface 121 come into contact, because the vertical distance between a portion of the surfaces of the first magnetic pole surface 111 and the second magnetic pole surface 121 is less than the vertical distance between the remaining surfaces, the portions with relatively closer vertical distances will contact first, preventing the portions with relatively greater vertical distances from contacting each other. In other words, when the moving magnetic component 12 and the stationary magnetic component 11 attract each other, the first magnetic pole surface 111 only partially contacts the second magnetic pole surface 121, and the first magnetic pole surface 111 and the second magnetic pole surface 121 have two spaced-apart parts.

[0045] In the aforementioned electromagnetic drive mechanism 10, because the vertical distance between some surfaces of the first magnetic pole surface 111 and the second magnetic pole surface 121 is greater than the vertical distance between the remaining surfaces, when the first magnetic pole surface 111 and the second magnetic pole surface 121 are attracted together, the portions with larger vertical distances between them will not directly contact each other. Therefore, when the stationary magnetic conductor 11 and the moving magnetic conductor 12 are attracted together, the contact area between the first magnetic pole surface 111 and the second magnetic pole surface 121 is reduced, which helps to increase the magnetic density when the first magnetic pole surface 111 and the second magnetic pole surface 121 are attracted together, thereby increasing the magnetic holding force when the stationary magnetic conductor 11 and the moving magnetic conductor 12 are attracted together. Furthermore, when the electromagnetic drive mechanism 10 increases the area of ​​the first magnetic pole surface 111 and the second magnetic pole surface 121 to enhance the electromagnetic attraction force when the stationary magnetic conductor 11 and the moving magnetic conductor 12 are not attracted, thereby reducing the attraction voltage of the stationary magnetic conductor 11 and the moving magnetic conductor 12 and reducing the power consumption of the coil, the electromagnetic drive mechanism 10 can reduce the contact area when the first magnetic pole surface 111 and the second magnetic pole surface 121 are attracted. While increasing the electromagnetic attraction force, it will not affect the holding force when the stationary magnetic conductor 11 and the moving magnetic conductor 12 are attracted. This can avoid the situation where the holding force decreases after attraction due to the increase in the area of ​​the first magnetic pole surface 111 and the second magnetic pole surface 121.

[0046] It should be noted that in the embodiments shown in the accompanying drawings of this application, the stationary magnetic conductor 11 is a stationary iron core and is disposed on the side of the magnetic conductor connector 15 facing the moving magnetic conductor 12. The magnetic conductor connector 15 can be a yoke plate, and the moving magnetic conductor 12 is located between the magnetic conductor connector 15 and the magnetic circuit constraint member 16. In other embodiments not shown in the accompanying drawings of this application, the electromagnetic drive mechanism 10 may omit the stationary iron core, in which case the stationary magnetic conductor 11 can be in the form of a yoke plate. The stationary magnetic conductor 11 is connected to the magnetic circuit constraint member 16, and the moving magnetic conductor 12 is located between the stationary magnetic conductor 11 and the magnetic circuit constraint member 16. The first magnetic pole surface 111 is formed by the side of the yoke plate forming the stationary magnetic conductor 11 facing the moving magnetic conductor 12.

[0047] Referring again to Figure 4, in some embodiments, the moving magnetic conductor 12 includes a moving core body 122 and an amplification portion 123 connected to the moving core body 122. The amplification portion 123 surrounds the end of the moving core body 122 facing the stationary magnetic conductor 11 and is arranged circumferentially around the moving core body 122. The surfaces of the moving core body 122 and the amplification portion 123 facing the stationary magnetic conductor 11 together constitute a second magnetic pole surface 121. The projection of the first magnetic pole surface 111 onto the second magnetic pole surface 121 substantially coincides with the second magnetic pole surface 121. In this embodiment, by adding the amplification portion 123 to the moving core body 122 to increase the area of ​​the second magnetic pole surface 121, the radial dimension of the stationary magnetic conductor 11 is also increased to adapt the area of ​​the first magnetic pole surface 111 to the area of ​​the second magnetic pole surface 121. By increasing the relative area of ​​the first magnetic pole surface 111 and the second magnetic pole surface 121, the electromagnetic attraction between the moving magnetic component 12 and the stationary magnetic component 11 can be enhanced. Furthermore, the design that the vertical distance between some surfaces of the first magnetic pole surface 111 and the second magnetic pole surface 121 is greater than the vertical distance between the remaining surfaces also helps to improve the holding force after attraction. In some embodiments, the moving core body 122 can be a columnar iron core structure with equal radial dimensions in each segment, the expansion portion 123 can be an iron ring structure, and the stationary magnetic component 11 can be a disc-shaped iron core structure.

[0048] Referring to Figures 3 and 4, in some embodiments, the radial dimension of the amplification section 123 gradually increases in the direction from the moving core body 122 towards the stationary magnetic conductor 11. This increases the area of ​​the second magnetic pole surface 121 to enhance electromagnetic attraction while also reducing the material consumption and weight of the moving magnetic conductor 12. Correspondingly, the inner circumferential surface of the sealing cylinder 14 corresponding to the extreme position of the amplification section 123 away from the stationary magnetic conductor 11 can also be configured as an inclined surface axially. In some embodiments, the inner diameter of the portion of the sealing cylinder 14 corresponding to the amplification section 123 and the stationary magnetic conductor 11 can be larger than the inner diameter of the portion corresponding to the moving core body 122 to accommodate the radial dimension difference between the amplification section 123, the stationary magnetic conductor 11, and the moving core body 122, thereby enhancing the support and limiting effect on the moving magnetic conductor 12 and improving the performance stability and structural reliability of the electromagnetic drive mechanism 10.

[0049] In some embodiments, at least one of the first magnetic pole surface 111 and the second magnetic pole surface 121 is provided with a groove 125. For example, when the first magnetic pole surface 111 is provided with a groove 125, the bottom wall of the groove 125 together with the remaining surface of the stationary magnetic conductor 11 facing the moving magnetic conductor 12 constitutes the first magnetic pole surface 111. When the second magnetic pole surface 121 is provided with a groove 125, the bottom wall of the groove 125 together with the remaining surface of the moving magnetic conductor 12 facing the stationary magnetic conductor 11 constitutes the second magnetic pole surface 121. When the moving magnetic conductor 12 and the stationary magnetic conductor 11 are attracted together, the portions of the first magnetic pole surface 111 and the second magnetic pole surface 121 located outside the groove 125 are in contact, and the bottom wall of the groove 125 does not form a contact surface for attraction, thereby improving the holding force after attraction. Moreover, the setting process of the groove 125 is simple, which can simplify the manufacturing process of the moving magnetic conductor 12 and the stationary magnetic conductor 11 and reduce the manufacturing cost.

[0050] In some embodiments, the first magnetic pole surface 111 has a central portion 126 and a peripheral portion 127 surrounding the central portion 126, and the second magnetic pole surface 121 has a central portion 126 and a peripheral portion 127 surrounding the central portion 126. The distance between the central portion 126 of the first magnetic pole surface 111 and the central portion 126 of the second magnetic pole surface 121 is greater than the distance between the peripheral portions 127 of the first magnetic pole surface 111 and the peripheral portions 127 of the second magnetic pole surface 121. For example, in some embodiments, at least one of the first magnetic pole surface 111 and the second magnetic pole surface 121 is provided with a groove 125, the bottom wall of the groove 125 forms the central portion 126, and the peripheral portion 127 is disposed around the groove 125. By increasing the distance between the middle portion 126 of the first magnetic pole surface 111 and the middle portion 126 of the second magnetic pole surface 121, when the moving magnetic element 12 and the stationary magnetic element 11 are attracted together, the peripheral portion 127 of the moving magnetic element 12 contacts the peripheral portion 127 of the stationary magnetic element 11, while the middle portion 126 of the moving magnetic element 12 and the middle portion 126 of the stationary magnetic element 11 are spaced apart. This allows for a reasonable planning of the contact position between the moving magnetic element 12 and the stationary magnetic element 11 during attraction, improving both the holding force and the uniformity of the attraction force. This is beneficial for improving the performance stability and structural reliability of the electromagnetic drive mechanism 10.

[0051] The following are three embodiments in which the moving magnetic component 12 and the stationary magnetic component 11 are spaced apart at their middle portions 126 when they are attracted together. This application is not limited to these embodiments. Referring to Figures 3 and 4, in some embodiments, a groove 125 is provided on the first magnetic pole surface 111, and the second magnetic pole surface 121 is a flat surface. The groove 125 is located at the middle position of the first magnetic pole surface 111, and the bottom wall of the groove 125 forms the middle portion 126 of the first magnetic pole surface 111. Referring to Figures 5 and 6, in other embodiments, grooves 125 are provided on both the first magnetic pole surface 111 and the second magnetic pole surface 121. The grooves 125 are respectively located at the middle positions of the first magnetic pole surface 111 and the second magnetic pole surface 121. The grooves 125 on the first magnetic pole surface 111 and the second magnetic pole surface 121 are opposite to each other, and the bottom walls of the two grooves 125 respectively form the middle portions 126 of the first magnetic pole surface 111 and the second magnetic pole surface 121. Referring to Figure 7, in some embodiments, the first magnetic pole surface 111 is a flat surface, and the second magnetic pole surface 121 is provided with a groove 125. The groove 125 is located in the middle of the second magnetic pole surface 121, and the bottom wall of the groove 125 forms the middle part 126 of the second magnetic pole surface 121. The part of the first magnetic pole surface 111 opposite to the groove 125 forms the middle part 126 of the first magnetic pole surface 111.

[0052] Referring again to Figures 2 and 4, in some embodiments, a first receiving groove 112 is formed on the first magnetic pole surface 111 of the stationary magnetic conductor 11, and a second receiving groove 124 opposite to the first receiving groove 112 is formed on the second magnetic pole surface 121 of the moving magnetic conductor 12. The first receiving groove 112 extends in the direction of the perpendicular line connecting the first magnetic pole surface 111 and the second magnetic pole surface 121. The two ends of the elastic element 13 are respectively disposed in the first receiving groove 112 and the second receiving groove 124, and respectively abut against the bottom walls of the first receiving groove 112 and the second receiving groove 124, so that the elastic element 13 can be compressed when the moving magnetic conductor 12 and the stationary magnetic conductor 11 approach each other. The first receiving groove 112 and the second receiving groove 124 can be respectively located at the middle position of the first magnetic pole surface 111 and the second magnetic pole surface 121, so as to reduce the influence of the arrangement of the first receiving groove 112 and the second receiving groove 124 on the structural strength and electromagnetic attraction of the moving magnetic conductor 12 and the stationary magnetic conductor 11.

[0053] Furthermore, referring to Figures 4 and 6, in some embodiments, when the first magnetic pole surface 111 is provided with a groove 125, a first receiving groove 112 is formed in the middle 126 of the first magnetic pole surface 111 and communicates with the groove 125. The first receiving groove 112 can be formed at the middle position of the middle 126 of the first magnetic pole surface 111. Referring to Figures 6 and 7, in some embodiments, when the second magnetic pole surface 121 is provided with a groove 125, a second receiving groove 124 is formed in the middle 126 of the second magnetic pole surface 121 and communicates with the groove 125. The second receiving groove 124 can be formed at the middle position of the middle 126 of the second magnetic pole surface 121. Thus, the layout of the groove 125 and the hole structure can be rationally planned, improving space utilization efficiency and reducing the influence of the groove 125 and the groove structure on the structural strength and electromagnetic attraction of the moving magnetic component 12 and the stationary magnetic component 11.

[0054] The process for setting the groove 125 is not limited. Referring to Figures 4 and 6, when the stationary magnetic conductor 11 has a groove 125, the portion of the stationary magnetic conductor 11 corresponding to the groove 125 and the portion outside the groove 125 can be an integral structure. Referring to Figures 6 and 7, when the moving magnetic conductor 12 has a groove 125, the portion of the moving magnetic conductor 12 corresponding to the groove 125 and the portion outside the groove 125 can be an integral structure. In this embodiment, the groove 125 can be formed by integral molding through mold design, or the groove 125 can be formed on the moving magnetic conductor 12 and / or the stationary magnetic conductor 11 through any applicable processing technology such as stamping, milling, wire cutting, or laser cutting.

[0055] Referring to Figures 6 and 7, in some other embodiments, when the moving magnetic conductor 12 is provided with an amplification portion 123 and a groove 125 is provided on the moving magnetic conductor 12, the surface of the amplification portion 123 facing the stationary magnetic conductor 11 protrudes towards the side where the moving core body 122 faces the stationary magnetic conductor 11 relative to the surface of the moving core body 122 facing the stationary magnetic conductor 11. The inner peripheral surface of the amplification portion 123 and the surface of the moving core body 122 facing the stationary magnetic conductor 11 form a groove 125. The surface of the moving core body 122 facing the stationary magnetic conductor 11 forms the middle portion 126 of the second magnetic pole surface 121, and the surface of the amplification portion 123 facing the stationary magnetic conductor 11 forms the peripheral portion 127 of the second magnetic pole surface 121. Therefore, during the process of connecting the amplification part 123 to the moving core body 122 to form the moving magnetic conductor 12, the surfaces of the amplification part 123 and the moving core body 122 facing the stationary magnetic conductor 11 are not flush. This results in a groove 125 being formed between the amplification part 123 and the moving core body 122 after they are fixedly connected, eliminating the need for additional steps to form the groove 125. This simplifies the fabrication process of the moving magnetic conductor 12 and reduces manufacturing costs. In this embodiment, the connection method between the amplification part 123 and the moving core body 122 includes, but is not limited to, welding, riveting, fastening, gluing, or any other suitable connection method. Of course, in other embodiments, the moving core body 122 and the amplification part 123 can also be an integral structure. The groove 125 can be formed after integral molding by designing the mold of the moving magnetic conductor 12, or the groove 125 can be formed on the moving magnetic conductor 12 by any other suitable process.

[0056] 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.

[0057] 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. An electromagnetic drive mechanism, comprising: A statically conductive magnetic component having a first magnetic pole face; The moving magnetic conductor has a second magnetic pole surface opposite to the first magnetic pole surface; A coil is fixed relative to the stationary magnetic conductor and is arranged circumferentially around the moving magnetic conductor; The moving magnetic conductor can move relative to the coil to move closer to or away from the stationary magnetic conductor; The vertical distance between some surfaces of the first magnetic pole surface and the second magnetic pole surface is greater than the vertical distance between the remaining surfaces.

2. The electromagnetic drive mechanism of claim 1, wherein, At least one of the first magnetic pole surface and the second magnetic pole surface is provided with a groove.

3. The electromagnetic drive mechanism of claim 1, wherein, The first magnetic pole surface has a central portion and a peripheral portion surrounding the central portion, and the second magnetic pole surface has a central portion and a peripheral portion surrounding the central portion. The distance between the central portion of the first magnetic pole surface and the central portion of the second magnetic pole surface is greater than the distance between the peripheral portions of the first magnetic pole surface and the peripheral portions of the second magnetic pole surface.

4. The electromagnetic drive mechanism of claim 3, wherein, At least one of the first magnetic pole surface and the second magnetic pole surface is provided with a groove, the bottom wall of the groove forms the middle part, and the peripheral part is arranged around the groove.

5. The electromagnetic drive mechanism of claim 4, wherein, The first magnetic pole surface is a flat surface, and the second magnetic pole surface is provided with the groove.

6. The electromagnetic drive mechanism of claim 4, wherein, The first magnetic pole surface has the groove, and the second magnetic pole surface is a flat surface.

7. The electromagnetic drive mechanism of claim 4, wherein, The grooves are provided on both the first magnetic pole surface and the second magnetic pole surface, and the grooves on the first magnetic pole surface and the second magnetic pole surface are opposite to each other.

8. The electromagnetic drive mechanism of claim 4, wherein, The stationary magnetic conductor has a first receiving groove on its first magnetic pole surface and a second receiving groove opposite to the first receiving groove on its second magnetic pole surface. The electromagnetic drive mechanism also includes an elastic element with its two ends respectively located in the first receiving groove and the second receiving groove. The elastic element can be compressed when the moving magnetic conductor and the stationary magnetic conductor come close to each other.

9. The electromagnetic drive mechanism of claim 8, wherein, When the first magnetic pole surface is provided with the groove, the first receiving groove is opened in the middle of the first magnetic pole surface and communicates with the groove; when the second magnetic pole surface is provided with the groove, the second receiving groove is opened in the middle of the second magnetic pole surface and communicates with the groove.

10. The electromagnetic drive mechanism of claim 1, wherein, The moving magnetic conductor includes a moving core body and an amplification section connected to the moving core body. The amplification section surrounds one end of the moving core body facing the stationary magnetic conductor and is disposed around the moving core body. The surfaces of the moving core body and the amplification section facing the stationary magnetic conductor together constitute the second magnetic pole surface. The projection of the first magnetic pole surface onto the second magnetic pole surface roughly coincides with the second magnetic pole surface.

11. The electromagnetic drive mechanism of claim 10, wherein, The moving core body has a groove on the side facing the stationary magnetic conductor.

12. The electromagnetic drive mechanism of claim 10, wherein, The surface of the amplification section facing the stationary magnetic component protrudes towards the side where the stationary magnetic component is located, relative to the surface of the moving core body facing the stationary magnetic component. The inner circumferential surface of the amplification section and the surface of the moving core body facing the stationary magnetic component form a groove.

13. The electromagnetic drive mechanism of claim 1, wherein, The electromagnetic drive mechanism further includes a magnetically conductive connector and a magnetic circuit constraint member. The moving magnetically conductive member is located between the magnetically conductive connector and the magnetic circuit constraint member, and the stationary magnetically conductive member is located on the side of the magnetically conductive connector facing the moving magnetically conductive member.

14. The electromagnetic drive mechanism of claim 1, wherein, The electromagnetic drive mechanism further includes a magnetic circuit constraint member, the stationary magnetic conductor is connected to the magnetic circuit constraint member, and the moving magnetic conductor is located between the stationary magnetic conductor and the magnetic circuit constraint member.

15. A high-voltage DC relay, comprising a contact portion and an electromagnetic drive mechanism as described in any one of claims 1-14, wherein the mutual approach or distance between the stationary and moving magnetic components of the electromagnetic drive mechanism can drive the contact portion to close or open.

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