Electromagnetic drive mechanism and high-voltage direct-current relay

Abstract

Provided are an electromagnetic drive mechanism (10) and a high-voltage direct-current relay. The electromagnetic drive mechanism (10) comprises a coil, a stationary magnetic conductive member (11), and a movable magnetic conductive member (12). The stationary magnetic conductive member (11) is fixed relative to the coil. The movable magnetic conductive member (12) is arranged opposite to the stationary magnetic conductive member (11), and the movable magnetic conductive member (12) can be magnetized when the coil is energized, so as to move toward the stationary magnetic conductive member (11). The movable magnetic conductive member (12) comprises a movable core body (122) and an expansion portion (123) that are separately arranged and connected to each other, wherein the expansion portion (123) is arranged at the end of the movable core body (122) facing the stationary magnetic conductive member (11) and arranged circumferentially around the movable core body (122).

Description

Electromagnetic drive mechanism and high-voltage DC relay

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on October 16, 2024, with application number 2024225062379 and 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 high-voltage DC 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). High-voltage DC relays are commonly used in automatic control circuits, playing roles such as automatic adjustment, safety protection, and circuit switching. They are a common type of relay. The electromagnetic drive mechanism, also called the magnetic circuit part, is used in high-voltage DC relays to drive the contact parts of the 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 increasing the electromagnetic attraction between the moving and stationary iron cores, the voltage at which they engage can be reduced, thereby reducing coil power consumption. However, in traditional electromagnetic drive mechanisms, increasing the electromagnetic attraction between the moving and stationary iron cores can easily increase the manufacturing and maintenance difficulty of the moving iron core. 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 coil, a stationary magnetic conductor, and a moving magnetic conductor. The stationary magnetic conductor is fixed relative to the coil. The moving magnetic conductor is disposed opposite to the stationary magnetic conductor and can be magnetized to move towards the stationary magnetic conductor when the coil is energized. The moving magnetic conductor includes a separately disposed but interconnected moving core body and an amplification section. The amplification section is disposed at the end of the moving core body facing the stationary magnetic conductor and is arranged circumferentially around the moving core body.

[0008] The aforementioned electromagnetic drive mechanism, by incorporating an amplification section surrounding the moving core body on the moving magnetic component, increases the area of ​​the magnetic pole face of the moving magnetic component facing the stationary magnetic component. This, in turn, enhances the electromagnetic attraction between the two components, reduces the voltage during their engagement, and lowers the power consumption of the electromagnetic drive mechanism. Furthermore, by increasing the magnetic pole face area and designing the moving magnetic component as a separate structure for the moving core body and the amplification section, the design and fabrication complexity of each part of the moving magnetic component is reduced, enhancing its design flexibility. Simultaneously, it facilitates the replacement and maintenance of the amplification section, thereby reducing the fabrication and maintenance costs of the moving magnetic component.

[0009] In one embodiment, the connection method between the moving core body and the expansion part is laser welding, brazing, riveting, press riveting, interference fit, or threaded connection.

[0010] In one embodiment, the outer peripheral surface of the moving core body is provided with a stepped structure. The stepped structure has a first stepped surface extending axially along the moving core body and a second stepped surface facing the stationary magnetic conductor. The amplification part is sleeved on the moving core body, the inner peripheral surface of the amplification part is adapted to the first stepped surface, and the surface of the amplification part facing away from the stationary magnetic conductor abuts against the second stepped surface. This improves the bonding strength between the amplification part and the moving core body.

[0011] In one embodiment, the moving core body includes a main body and a fastening protrusion protruding from the main body towards the stationary magnetic component. The amplification portion is sleeved on the fastening protrusion, with the surface of the amplification portion facing away from the stationary magnetic component abutting against the surface of the main body facing the stationary magnetic component. The inner peripheral surface of the amplification portion is tightly fitted with the outer peripheral surface of the fastening protrusion. This improves the bonding strength between the amplification portion and the moving core body.

[0012] In one embodiment, the stationary magnetic component has a first magnetic pole surface facing the moving magnetic component, and the moving magnetic component has a second magnetic pole surface facing the stationary magnetic component. The orthographic projection of the first magnetic pole surface onto the second magnetic pole surface coincides with the second magnetic pole surface, so that the moving magnetic component and the stationary magnetic component can be effectively attracted together by electromagnetic attraction.

[0013] In one embodiment, the stationary magnetic element includes a stationary core and an extension portion connected to each other, the extension portion being disposed circumferentially around the stationary core.

[0014] In one embodiment, the radial dimension of the extension gradually increases in the direction from the moving magnetic component to the stationary magnetic component, and the orthographic projection of the extension on the plane containing the second magnetic pole surface is located outside the second magnetic pole surface. Thus, the extension can effectively absorb leakage flux in the magnetic circuit, improving the magnetic utilization efficiency of the electromagnetic drive mechanism, thereby enhancing the electromagnetic attraction between the stationary and moving magnetic components. Simultaneously, the extension does not affect the overall structural layout of the electromagnetic drive mechanism, helping to reduce the space occupied by the mechanism. Furthermore, since the extension does not participate in the formation of the first magnetic pole surface, it does not cause a decrease in magnetic density when the first and second magnetic pole surfaces are attracted, thus balancing the improvement of the holding force of the moving and stationary magnetic components.

[0015] In one embodiment, the radial dimension of the amplification section gradually increases in the direction from the moving core body to the stationary magnetic conductor. This increases the area of ​​the second magnetic pole face by providing the amplification section, thereby enhancing the electromagnetic attraction of the moving and stationary magnetic conductors, while also reducing the material consumption and space required for the amplification section.

[0016] In one embodiment, the electromagnetic drive mechanism further includes a sealing element surrounding the moving magnetic element and the stationary magnetic element. The moving magnetic element is slidably disposed within the sealing element along the axial direction. The sealing element includes a first segment, a second segment, a third segment, and a fourth segment sequentially disposed in the direction from the stationary magnetic element to the moving magnetic element. The first segment is inclined to the axial direction of the stationary magnetic element and conforms to the outer peripheral surface of the extension portion. The radial dimension of the second segment is larger than that of the fourth segment. The second segment is disposed corresponding to the amplification portion. The fourth segment is slidably engaged with the moving core body. The third segment is inclined to the axial direction of the moving core body and conforms to the outer peripheral surface of the amplification portion.

[0017] 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;

[0018] 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.

[0019] A high-voltage DC relay includes a contact portion and an electromagnetic drive mechanism as described in any of the above embodiments, wherein the proximity of the stationary and moving magnetic components of the electromagnetic drive mechanism can drive the contact portion to contact each other.

[0020] 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

[0021] 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.

[0022] Figure 1 is a schematic diagram of the electromagnetic drive mechanism in some embodiments.

[0023] Figure 2 is an exploded schematic diagram of the electromagnetic drive mechanism shown in Figure 1.

[0024] Figure 3 is a cross-sectional schematic diagram of the electromagnetic drive mechanism shown in Figure 1 along the AA direction.

[0025] Figure 4 is a partially enlarged schematic diagram of the area within the dashed box of the electromagnetic drive mechanism shown in Figure 3.

[0026] Figure 5 is a schematic diagram of the structure of the moving magnetic conductor in some embodiments.

[0027] Figure 6 is a schematic diagram of the assembly process of the moving magnetic conductor shown in Figure 5.

[0028] Figure 7 is a cross-sectional schematic diagram of the moving magnetic conductor shown in Figure 5 along the BB direction.

[0029] Figure 8 is a structural schematic diagram of the moving magnetic conductor in some other embodiments.

[0030] Figure 9 is a cross-sectional schematic diagram of the moving magnetic conductor shown in Figure 8 along the CC direction. 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] 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.

[0038] 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, so as to realize the conduction or disconnection of the electrical circuit when the high-voltage DC relay is used in the electrical circuit.

[0039] 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 element 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 can be magnetized by the magnetic field generated by the coil and generate an electromagnetic attraction force between them, which can drive the moving magnetic element 12 to move towards 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 for the moving magnetic element 12, driving the moving magnetic element 12 to move away from the stationary magnetic element 11 and detach from it. The sealing element 14 covers the moving magnetic element 12 to protect it and limit its sliding stroke relative to the stationary magnetic element 11.

[0040] 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 can jointly enclose the periphery of 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 enclosed 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. That is, the stationary magnetically conductive member 11 is relatively fixed to the coil, and the movable magnetically conductive member 12 can be magnetized when the coil is energized to move towards the stationary magnetically conductive member 11. 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.

[0041] 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.

[0042] Furthermore, referring to Figures 2, 3, and 4, in some embodiments, the moving magnetic conductor 12 is formed by connecting two separate structures. The moving magnetic conductor 12 includes a moving core body 122 and an amplification section 123 connected to each other. The amplification section 123 is located at one end of the moving core body 122 facing the stationary magnetic conductor 11 and is arranged circumferentially around the moving core body 122. The surface of the moving core body 122 facing the stationary magnetic conductor 11 and the surface of the amplification section 123 facing the stationary magnetic conductor 11 together form the second magnetic pole surface 121. The surfaces of the moving core body 122 and the amplification section 123 facing the stationary magnetic conductor 11 can be flush, in which case the second magnetic pole surface 121 is a flat surface. Alternatively, the surfaces of the moving core body 122 and the amplification section 123 can be non-flush, in which case the second magnetic pole surface 121 can be considered to be composed of two spaced-apart surfaces. In some embodiments, the moving core body 122 may include, but is not limited to, an iron core structure, and the expansion part 123 may include, but is not limited to, an iron ring structure.

[0043] It is understandable that adding an amplification section 123 to the moving core body 122 helps to increase the area of ​​the second magnetic pole surface 121 and the relative area of ​​the first magnetic pole surface 111 and the second magnetic pole surface 121. This, in turn, helps to increase the electromagnetic attraction between the moving magnetic conductor 12 and the stationary magnetic conductor 11 when the coil is energized, and helps to reduce the voltage when the moving magnetic conductor 12 and the stationary magnetic conductor 11 are attracted, thus reducing the power consumption of the coil. At the same time, the moving magnetic conductor 12 is formed by connecting the two separately set moving core body 122 and the amplification section 123. During the preparation of the moving magnetic conductor 12, there is no need to adjust the shape and size of the entire moving magnetic conductor 12. The moving core body 122 can adopt a standard moving iron core structure, while the shape and size of the amplification section 123 can be designed to meet the different shape and size specifications of the second magnetic pole surface 121, which helps to reduce the design and preparation difficulty of the moving magnetic conductor 12. Furthermore, when replacing or maintaining the moving magnetic component 12, such as adjusting the area of ​​the second magnetic pole surface 121 or replacing the damaged amplification section 123, the amplification section 123 can be removed from the moving core body 122. Only the amplification section 123 needs to be replaced and maintained, which helps to reduce the manufacturing and maintenance costs of the moving magnetic component 12 and improve the design flexibility of the moving magnetic component 12 to meet more different usage requirements.

[0044] 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.

[0045] In some embodiments, the connection method between the moving core body 122 and the expansion part 123 includes, but is not limited to, any applicable fixed connection method such as laser welding, brazing, riveting connection, press riveting connection, interference fit, threaded fit, etc. The specific connection method can be set according to the structural design and connection requirements. Some of the connection methods are used as examples below.

[0046] Please refer to Figures 5, 6, and 7. In some embodiments, the outer peripheral surface of the moving core body 122 is provided with a stepped structure. The stepped structure has a first stepped surface 1221 extending axially along the moving core body 122 and a second stepped surface 1222 facing the stationary magnetic conductor 11. The first stepped surface 1221 and the second stepped surface 1222 may be perpendicular to each other. In some embodiments, the stepped structure can be formed by designing a mold for the moving core body 122 or by cutting or other processes on the moving core body 122. The amplification part 123 is sleeved on the moving core body 122 and is provided corresponding to the stepped structure. The inner peripheral surface of the amplification part 123 is adapted to the first stepped surface 1221. For example, the radial dimension of the inner peripheral surface of the amplification part 123 is approximately equal to the radial dimension of the first stepped surface 1221 to improve the bonding strength between the amplification part 123 and the moving core body 122. The end face of the amplification section 123 facing away from the static magnetic conductor 11 abuts against the second step surface 1222, so that the amplification section 123 and the moving core body 122 can be mutually positioned in the axial direction.

[0047] In this embodiment, the moving core body 122 and the amplification part 123 can be prepared separately. Then, the amplification part 123 is fitted onto the end of the moving core body 122 along the direction of the dashed arrow shown in Figure 6 until the end face of the amplification part 123 abuts against the second step surface 1222. Then, the moving core body 122 and the amplification part 123 are fixedly connected by any applicable connection process. For example, the inner circumferential surface of the amplification section 123 and the first step surface 1221 are connected by laser welding; or, brazing filler metal is provided on the second step surface 1222 and brazing is used; or, the portion of the moving core body 122 corresponding to the first step surface 1221 is expanded and riveted, so that the first step surface 1221 and the amplification section 123 are tightly connected. When expanding and riveting is used, the inner circumferential surface of the amplification section 123 can be tilted relative to the axial direction of the moving core body 122. For example, the radial dimension of the inner circumferential surface can gradually increase in the direction of the moving core body 122 pointing to the static magnetic conductor 11, thereby improving the bonding strength between the moving core body 122 and the amplification section 123 after expanding and riveting.

[0048] Referring to Figures 8 and 9, in some embodiments, the moving core body 122 includes a body 1223 and a fastening protrusion 1224 protruding from the body 1223 toward the stationary magnetic conductor 11. The radial dimension of the fastening protrusion 1224 may be smaller than the radial dimension of the first step surface 1221 in the embodiment shown in Figure 7. The fastening protrusion 1224 can be formed by designing a mold for the moving core body 122 or by cutting on the moving core body 122. The amplification part 123 is sleeved on the fastening protrusion 1224. The end face of the amplification part 123 facing away from the stationary magnetic conductor 11 abuts against the surface of the body 1223 toward the stationary magnetic conductor 11 to limit each other in the axial direction. The inner peripheral surface of the amplification part 123 is tightly fitted with the outer peripheral surface of the fastening protrusion 1224. In this embodiment, the inner circumferential surface of the amplification part 123 can be inclined to the axial direction of the moving core body 122. For example, in the direction from the moving core body 122 to the stationary magnetic conductor 11, the radial dimension of the inner circumferential surface of the amplification part 123 can gradually increase. After the amplification part 123 is fitted onto the fastening protrusion 1224, the fastening protrusion 1224 is expanded and riveted so that the outer circumferential surface of the fastening protrusion 1224 is tightly fitted with the inner circumferential surface of the amplification part 123, which helps to improve the bonding strength between the amplification part 123 and the moving core body 122. Of course, in this embodiment, any applicable connection method such as adhesive bonding, snap fastening, interference fit, threaded connection, or welding can also be used to achieve the fixed connection between the amplification part 123 and the moving core body 122.

[0049] Referring again to Figures 2, 3, and 4, in some embodiments, the orthographic projection of the first magnetic pole surface 111 onto the second magnetic pole surface 121 coincides with the second magnetic pole surface 121, so that the moving magnetic conductor 12 and the stationary magnetic conductor 11 can be effectively attracted together by electromagnetic attraction. In some embodiments, the stationary magnetic conductor 11 includes a stationary core 112 and an extension portion 113 connected to each other. The extension portion 113 is arranged axially around the stationary core 112, and the connection method between the extension portion 113 and the stationary core 112 includes, but is not limited to, any applicable method such as laser welding, brazing, or riveting. In some embodiments, the radial dimension of the extension portion 113 gradually increases in the direction from the moving magnetic conductor 12 to the stationary magnetic conductor 11, and the orthographic projection of the extension portion 113 onto the plane containing the second magnetic pole surface 121 is located outside the second magnetic pole surface 121. For example, the orthographic projection of the stationary core 112 onto the second magnetic pole surface 121 coincides with the second magnetic pole surface 121, while the extension portion 113 is located on the outer periphery of the stationary core 112. The stationary core 112 can be an iron core structure, and the extension 113 can be an iron ring structure.

[0050] With this configuration, the extension portion 113 can effectively absorb leakage magnetic flux in the magnetic circuit, improve the magnetic utilization efficiency of the electromagnetic drive mechanism 10, and thus help improve the electromagnetic attraction between the stationary magnetic conductor 11 and the moving magnetic conductor 12. At the same time, the configuration of the extension portion 113 will not affect the overall structural layout of the electromagnetic drive mechanism 10, which is conducive to reducing the space occupied by the electromagnetic drive mechanism 10. In addition, the extension portion 113 does not participate in the formation of the first magnetic pole surface 111, and will not cause the magnetic density to decrease when the first magnetic pole surface 111 and the second magnetic pole surface 121 are attracted together, which is conducive to balancing the improvement of the holding force of the moving magnetic conductor 12 and the stationary magnetic conductor 11.

[0051] 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 to the stationary magnetic conductor 11. This increases the area of ​​the second magnetic pole surface 121 by providing the amplification section 123, thereby enhancing the electromagnetic attraction of the moving magnetic conductor 12 and the stationary magnetic conductor 11, while also reducing the material consumption and space occupied by the amplification section 123. It should be noted that the sealing element 14 is arranged around the moving magnetic conductor 12 and the stationary magnetic conductor 11. The structure of the sealing element 14 can be adapted and adjusted according to the structure of the moving magnetic conductor 12 and the stationary magnetic conductor 11 to provide good protection and limiting effect for them. In some embodiments, the sealing element 14 can form a sealed space enclosing the moving magnetic conductor 12 and the stationary magnetic conductor 11, providing sealing protection and reducing the risk of corrosion or oxidation of the moving magnetic conductor 12 and the stationary magnetic conductor 11.

[0052] For example, referring to Figures 2 and 3, in some embodiments, the enclosing element 14 includes a first segment 141, a second segment 142, a third segment 143, and a fourth segment 144 arranged sequentially in the direction from the stationary magnetic element 11 to the moving magnetic element 12. The first segment 141, the second segment 142, the third segment 143, and the fourth segment 144 can be connected sequentially and are all generally in the form of annular sheet structures. When the outer peripheral surface of the extension portion 113 is inclined to the axial direction of the stationary magnetic element 11, the first segment 141 is also inclined to the axial direction of the stationary magnetic element 11 and conforms to the outer peripheral surface of the extension portion 113. For example, in the direction from the moving magnetic element 12 to the stationary magnetic element 11, the radial dimension of the inner peripheral surface of the first segment 141 gradually increases. The inner peripheral surface of the first segment 141 can abut against the extension portion 113 or there is a gap between the first segment 141 and the extension portion 113, which can provide protection for the stationary magnetic element 11. The radial dimension of the second segment 142 is larger than that of the fourth segment 144. The second segment 142 is set to correspond to the sliding stroke of the amplification section 123. The fourth segment 144 is slidably engaged with the moving core body 122. Both the second segment 142 and the fourth segment 144 can be hollow columnar structures with equal radial dimensions at all points. The third segment 143 is connected to the second segment 142 and the fourth segment 144 respectively. The third segment 143 is inclined to the axial direction of the moving core body 122 and conforms to the outer peripheral surface of the amplification section 123. When the moving magnetic conductor 12 moves to its limit position away from the stationary magnetic conductor 11, the outer peripheral surface of the amplification section 123 can abut against the inner peripheral surface of the third segment 143. In this embodiment, the magnetic cylinder 17 can be sleeved on the fourth segment 144.

[0053] In some embodiments, the sealing element 14 further includes a fifth segment 145 connected to the first segment 141. The fifth segment 145 may be approximately perpendicular to the axial direction of the stationary magnetic conductor 11. The fifth segment 145 may be a flange at the end of the sealing element 14. The fifth segment 145 is attached to the side of the magnetic conductor connector 15 facing the moving magnetic conductor 12, so that the sealing element 14 can be connected to the magnetic conductor connector 15 as a whole, providing good protection and limiting effect for the moving magnetic conductor 12 and the stationary magnetic conductor 11.

[0054] 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.

[0055] 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 wherein, include: coil; A static magnetic conductor is fixed relative to the coil; and, A moving magnetic conductor is disposed opposite to the stationary magnetic conductor, and the moving magnetic conductor can be magnetized when the coil is energized to move toward the stationary magnetic conductor. The moving magnetic conductor includes a moving core body and an amplification part that are separately arranged and connected to each other. The amplification part is located at one end of the moving core body facing the stationary magnetic conductor and is arranged around the moving core body in the circumferential direction.

2. The electromagnetic drive mechanism of claim 1, wherein, The connection between the moving core body and the expansion section can be laser welding, brazing, riveting, press riveting, interference fit, or threaded connection.

3. The electromagnetic drive mechanism of claim 1, wherein, The outer peripheral surface of the moving core body is provided with a stepped structure. The stepped structure has a first stepped surface extending along the axial direction of the moving core body and a second stepped surface facing the static magnetic conductor. The amplification part is sleeved on the moving core body. The inner peripheral surface of the amplification part is adapted to the first stepped surface, and the surface of the amplification part facing away from the static magnetic conductor abuts against the second stepped surface.

4. The electromagnetic drive mechanism of claim 1, wherein, The moving core body includes a main body and a fastening protrusion protruding from the main body on the side facing the static magnetic component. The amplification part is sleeved on the fastening protrusion. The surface of the amplification part facing away from the static magnetic component abuts against the surface of the main body facing the static magnetic component. The inner peripheral surface of the amplification part is tightly fitted with the outer peripheral surface of the fastening protrusion.

5. The electromagnetic drive mechanism of claim 1, wherein, The stationary magnetic conductor has a first magnetic pole surface facing the moving magnetic conductor, and the moving magnetic conductor has a second magnetic pole surface facing the stationary magnetic conductor. The orthographic projection of the first magnetic pole surface onto the second magnetic pole surface coincides with the second magnetic pole surface.

6. The electromagnetic drive mechanism of claim 5, wherein, The static magnetic conductor includes a static core and an extension portion connected to each other, the extension portion being arranged circumferentially around the static core.

7. The electromagnetic drive mechanism of claim 6, wherein, The radial dimension of the extension gradually increases in the direction from the moving magnetic component to the stationary magnetic component, and the orthographic projection of the extension on the plane containing the second magnetic pole surface is located outside the second magnetic pole surface.

8. The electromagnetic drive mechanism of claim 7, wherein, In the direction from the moving core body to the stationary magnetic conductor, the radial dimension of the amplification section gradually increases.

9. The electromagnetic drive mechanism of claim 8, wherein, The electromagnetic drive mechanism further includes a sealing element, which surrounds the moving magnetic conductor and the stationary magnetic conductor. The moving magnetic conductor is slidably disposed within the sealing element along the axial direction. The sealing element includes a first segment, a second segment, a third segment, and a fourth segment arranged sequentially in the direction from the stationary magnetic conductor to the moving magnetic conductor. The first segment is inclined to the axial direction of the stationary magnetic conductor and conforms to the outer peripheral surface of the extension portion. The radial dimension of the second segment is larger than that of the fourth segment. The second segment is disposed corresponding to the amplification portion. The fourth segment is slidably engaged with the moving core body. The third segment is inclined to the axial direction of the moving core body and conforms to the outer peripheral surface of the amplification portion.

10. 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.

11. 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.

12. A high voltage DC relay comprising a contact portion and an electromagnetic drive mechanism as claimed in any one of claims 1-11, the mutual approach of the static and dynamic flux guides of the electromagnetic drive mechanism being capable of driving the contact portion into contact.

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