Electromagnetic driving mechanism and high-voltage direct-current relay

Abstract

The utility model relates to an electromagnetic driving mechanism and a high-voltage direct-current relay. The electromagnetic driving mechanism comprises a coil, a static magnetic conductive piece and a movable magnetic conductive piece. The static magnetic conductive piece and the coil are relatively fixed; the movable magnetic conductive piece and the static magnetic conductive piece are oppositely arranged, and the movable magnetic conductive piece can be magnetized to move towards the static magnetic conductive piece when the coil is electrified; the movable magnetic conductive piece comprises a movable core body and an amplification part which are arranged in a split mode and connected with each other. The amplification part is arranged at the end, facing the static magnetic conductive piece, of the movable core body and surrounds the movable core body in the circumferential direction. According to the electromagnetic driving mechanism, the movable magnetic conductive piece is arranged to be of a split structure of the movable core body and the amplification part, and the preparation and maintenance cost of the movable magnetic conductive piece can be reduced.

Description

Technical Field

[0001] The present application relates to the field of relay technology, and in particular to an electromagnetic drive mechanism and a high-voltage DC relay. Background Art

[0002] 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, providing functions such as automatic regulation, safety protection, and circuit switching. They are a common type of relay. The electromagnetic drive mechanism, also known as the magnetic circuit portion of a high-voltage DC relay, is used to drive the contacts of the high-voltage DC relay to switch. The electromagnetic drive mechanism's moving and stationary iron cores are attracted by magnetic force, driving the contacts of the high-voltage DC relay into contact.

[0003] As the use of high-voltage DC relays continues to expand, the industry's requirements for the electromagnetic attraction between the moving and stationary cores are becoming increasingly stringent. By increasing the electromagnetic attraction between the moving and stationary cores, the voltage when they are closed can be reduced, thereby reducing the power consumption of the coil. However, in traditional electromagnetic drive mechanisms, increasing the electromagnetic attraction between the moving and stationary cores can easily increase the difficulty of manufacturing and maintaining the moving core. Utility Model Content

[0004] Based on this, it is necessary to provide an electromagnetic drive mechanism and a high-voltage DC relay to enhance the electromagnetic attraction between the moving and static iron cores while reducing the difficulty of manufacturing and maintaining the moving iron core.

[0005] An electromagnetic drive mechanism, comprising:

[0006] Coil;

[0007] a static magnetic conductive member fixed relative to the coil; and

[0008] a dynamic magnetic conductive member, arranged opposite to the static magnetic conductive member, wherein the dynamic magnetic conductive member can be magnetized to move toward the static magnetic conductive member when the coil is energized;

[0009] The dynamic magnetic conductive component includes a dynamic core body and an expansion portion that are separately provided and connected to each other. The expansion portion is provided at one end of the dynamic core body facing the static magnetic conductive component and is circumferentially arranged around the dynamic core body.

[0010] The electromagnetic drive mechanism described above, with the expansion portion disposed on the moving magnetic member surrounding the moving core body, can increase the area of ​​the magnetic pole face of the moving magnetic member facing the static magnetic member, thereby facilitating an increase in the electromagnetic attraction between the moving and static magnetic members, thereby reducing the voltage when the moving and static magnetic members are attracted, and thereby reducing the power consumption of the electromagnetic drive mechanism. Furthermore, while increasing the area of ​​the magnetic pole face, the moving magnetic member is configured as a separate structure consisting of a moving core body and an expansion portion. This reduces the difficulty in designing and manufacturing the various parts of the moving magnetic member, enhances the design flexibility of the moving magnetic member, and facilitates the replacement and maintenance of the expansion portion, thereby reducing the manufacturing and maintenance costs of the moving magnetic member.

[0011] In one embodiment, the dynamic core body and the amplification part are connected by laser welding, brazing welding, expansion riveting connection, press riveting connection, interference fit or threaded connection.

[0012] In one embodiment, the outer circumference of the moving core body is provided with a stepped structure, comprising a first stepped surface extending axially along the moving core body and a second stepped surface facing the static magnetic member. The amplifying portion is sleeved onto the moving core body, with the inner circumference of the amplifying portion matching the first stepped surface, and the surface of the amplifying portion facing away from the static magnetic member abutting the second stepped surface. This improves the bonding strength between the amplifying portion and the moving core body.

[0013] In one embodiment, the dynamic core body includes a main body and a fastening protrusion protruding from the side of the main body facing the static magnetic member. The amplifying portion is sleeved onto the fastening protrusion. The surface of the amplifying portion facing away from the static magnetic member abuts against the surface of the main body facing the static magnetic member. The inner circumference of the amplifying portion is tightly matched with the outer circumference of the fastening protrusion. This helps to improve the bonding strength between the amplifying portion and the dynamic core body.

[0014] In one embodiment, the static magnetic member has a first magnetic pole surface facing the dynamic magnetic member, and the dynamic magnetic member has a second magnetic pole surface facing the static magnetic member. The positive projection of the first magnetic pole surface on the second magnetic pole surface coincides with the second magnetic pole surface, so that the dynamic magnetic member and the static magnetic member can effectively utilize electromagnetic attraction to attract each other.

[0015] In one embodiment, the static magnetic permeable member includes a static core and an extension portion connected to each other, and the extension portion is circumferentially arranged around the static core.

[0016] In one embodiment, the radial dimension of the extension portion gradually increases in the direction from the dynamic magnetic member to the static magnetic member, and the orthographic projection of the extension portion on the plane where the second magnetic pole face is located is located outside the second magnetic pole face. In this way, the extension portion can effectively absorb the leakage magnetic flux in the magnetic circuit, improve the magnetic utilization efficiency of the electromagnetic drive mechanism, and thus help to improve the electromagnetic attraction between the static magnetic member and the dynamic magnetic member. At the same time, the provision of the extension portion will not affect the overall structural layout of the electromagnetic drive mechanism, and is conducive to compressing the space occupied by the electromagnetic drive mechanism. In addition, the extension portion does not participate in the formation of the first magnetic pole face, nor will it cause a decrease in the magnetic density when the first magnetic pole face and the second magnetic pole face are attracted to each other, which is conducive to taking into account the improvement of the holding force of the dynamic magnetic member and the static magnetic member.

[0017] In one embodiment, the radial dimension of the expansion portion gradually increases in the direction from the moving core body toward the static magnetic member. This increases the area of ​​the second magnetic pole face by providing the expansion portion, thereby enhancing the electromagnetic attraction between the moving and static magnetic members while also reducing consumables and space requirements of the expansion portion.

[0018] In one embodiment, the electromagnetic drive mechanism also includes a closing element, which is arranged around the dynamic magnetic part and the static magnetic part, and the dynamic magnetic part is slidably arranged in the closing element along the axial direction. The closing element includes a first section, a second section, a third section and a fourth section which are arranged in sequence in the direction from the static magnetic part to the dynamic magnetic part, the first section is inclined to the axial direction of the static magnetic part and is adapted to the outer peripheral surface of the extension part, the radial dimension of the second section is larger than that of the fourth section, the second section is arranged corresponding to the amplification part, the fourth section is slidably matched with the dynamic core body, and the third section is inclined to the axial direction of the dynamic core body and is adapted to the outer peripheral surface of the amplification part.

[0019] In one embodiment, the electromagnetic drive mechanism further includes a magnetic conductive connecting member and a magnetic circuit constraining member, the dynamic magnetic conductive member is located between the magnetic conductive connecting member and the magnetic circuit constraining member, and the static magnetic conductive member is provided on a side of the magnetic conductive connecting member facing the dynamic magnetic conductive member;

[0020] Alternatively, the electromagnetic drive mechanism further includes a magnetic circuit constraint member, the static magnetic permeable member is connected to the magnetic circuit constraint member, and the dynamic magnetic permeable member is located between the static magnetic permeable member and the magnetic circuit constraint member.

[0021] A high-voltage DC relay comprises a contact portion and an electromagnetic drive mechanism as described in any of the above embodiments, wherein the static magnetic conductive part and the dynamic magnetic conductive part of the electromagnetic drive mechanism approach each other to drive the contact portion into contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1Schematic diagram of the structure of the electromagnetic drive mechanism in some embodiments.

[0023] Figure 2 for Figure 1 Schematic diagram of the explosion of the electromagnetic drive mechanism shown.

[0024] Figure 3 for Figure 1 The schematic cross-sectional view of the electromagnetic drive mechanism shown is along the AA direction.

[0025] Figure 4 for Figure 3 A partial enlarged schematic diagram of the dotted box area of ​​the electromagnetic drive mechanism is shown.

[0026] Figure 5 Schematic diagram of the structure of the dynamic magnetic conductive component in some embodiments.

[0027] Figure 6 for Figure 5 Schematic diagram of the assembly process of the dynamic magnetic conductive parts shown.

[0028] Figure 7 for Figure 5 The cross-sectional schematic diagram of the dynamic magnetic conductive component along the BB direction is shown.

[0029] Figure 8 Schematic diagram of the structure of the dynamic magnetic conductive component in other embodiments.

[0030] Figure 9 for Figure 8 The cross-sectional schematic diagram of the dynamic magnetic conductive component along the CC direction is shown.

[0031] Reference numerals:

[0032] 10. Electromagnetic drive mechanism; 11. Static magnetic member; 111. First magnetic pole face; 112. Static core; 113. Extension portion; 12. Dynamic magnetic member; 121. Second magnetic pole face; 122. Dynamic core body; 1221. First step face; 1222. Second step face; 1223. Body; 1224. Fastening protrusion; 123. Amplification portion; 13. Elastic element; 14. Closing element; 141. First section; 142. Second section; 143. Third section; 144. Fourth section; 145. Fifth section; 15. Magnetic connector; 16. Magnetic circuit restraint; 17. Magnetic cylinder. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0036] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, 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 embodiment.

[0039] See Figure 1 、 Figure 2 and Figure 3 , Figure 1 and Figure 2 They are respectively a structural schematic diagram and an explosion schematic diagram of the electromagnetic drive mechanism 10 in some embodiments of the present application, Figure 3 for Figure 1 The electromagnetic drive mechanism 10 shown is a schematic cross-sectional view along the AA direction. The electromagnetic drive mechanism 10 provided in the present application includes but is not limited to being used in any applicable electronic components such as high-voltage DC relays and solenoid valves that convert electromagnetic energy into mechanical energy. In the present application, the electromagnetic drive mechanism 10 is used in a high-voltage DC relay as an example. The electromagnetic drive mechanism 10 includes a static magnetic member 11 and a dynamic magnetic member 12. The static magnetic member 11 has a first magnetic pole face 111, and the dynamic magnetic member 12 has a second magnetic pole face 121 opposite to the first magnetic pole face 111. The static magnetic member 11 and the dynamic magnetic member 12 can approach or move away from each other. When the dynamic magnetic member 12 approaches the static magnetic member 11 under the action of electromagnetic attraction until the dynamic magnetic member 12 and the static magnetic member 11 contact each other, the first magnetic pole face 111 and the second magnetic pole face 121 contact each other, and maintain a state of mutual attraction under the action of the electromagnetic holding force.

[0040] The high-voltage DC relay involved in the present application may include a contact portion (not shown in the figure) for realizing a switching function. The contact portion can be transmission-connected to the dynamic magnetic member 12. The mutual approach of the dynamic magnetic member 12 and the static magnetic member 11 can drive the contact portion to contact and close, and the mutual distance between the dynamic magnetic member 12 and the static magnetic member 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 when the high-voltage DC relay is used in 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 closing element 14. The coil is wound around the frame, which has a through hole. The dynamic magnetic member 12 is slidably disposed in the through hole of the frame, and the static magnetic member 11 is fixedly disposed at one end of the through hole and opposite to the dynamic magnetic member 12. The elastic element 13 includes, but is not limited to, a spring, etc., and the two ends of the elastic element 13 respectively abut against the dynamic magnetic member 12 and the static magnetic member 11. It is understood that when current is applied to the coil, the static magnetic member 11 and the dynamic magnetic member 12 can be magnetized by the magnetic field generated by the coil and generate electromagnetic attraction between each other, which can drive the dynamic magnetic member 12 to move toward the static magnetic member 11 until the first magnetic pole face 111 and the second magnetic pole face 121 come into contact. As the dynamic magnetic member 12 and the static magnetic member 11 approach each other, they squeeze the elastic element 13, causing it to be compressed. When the holding force between the dynamic magnetic member 12 and the static magnetic member 11 is too small or disappears, the elastic restoring force of the elastic element 13 provides a reset force for the dynamic magnetic member 12, driving the dynamic magnetic member 12 to move away from the static magnetic member 11 and separate from the static magnetic member 11. The closing element 14 is provided on the dynamic magnetic member 12 to protect the dynamic magnetic member 12 and limit the sliding stroke of the dynamic magnetic member 12 relative to the static magnetic member 11.

[0042] In some embodiments, the electromagnetic drive mechanism 10 further includes a magnetic connector 15, a magnetic circuit constraint 16, and a magnetic cylinder 17. The magnetic connector 15 includes but is not limited to a yoke plate, and the magnetic circuit constraint 16 includes but is not limited to a U-shaped yoke. The magnetic connector 15 is connected to both ends of the magnetic circuit constraint 16 and together with the magnetic circuit constraint 16 forms a square frame shape. The magnetic connector 15 and the magnetic circuit constraint 16 can be together enclosed around the skeleton and the coil. The static magnetic member 11 is fixedly mounted on the magnetic connector 15. The dynamic magnetic member 12 can slide within the space enclosed by the magnetic connector 15 and the magnetic circuit constraint 16. The magnetic connector 15 and the magnetic circuit constraint 16 can together enclose the magnetic lines of force generated by the coil, thereby enhancing the electromagnetic attraction between the dynamic magnetic member 12 and the static magnetic member 11 when the coil is energized. In other words, the static magnetic member 11 is fixed relative to the coil, and the dynamic magnetic member 12 can be magnetized when the coil is energized to move toward the static magnetic member 11. The magnetic tube 17 is located between the frame and the dynamic magnetic member 12. For example, the magnetic tube 17 surrounds the outer periphery of the dynamic magnetic member 12, and the dynamic magnetic member 12 is slidably disposed within the magnetic tube 17. The frame is sleeved around the outer periphery of the magnetic tube 17. The magnetic tube 17 can enhance the magnetic field generated by the coil and guide the direction of the magnetic field. It also helps to reduce the magnetic resistance in the magnetic circuit, thereby improving the efficiency of magnetic field utilization and enhancing the electromagnetic attraction between the dynamic magnetic member 12 and the static magnetic member 11.

[0043] It should be noted that the above-mentioned components and their relationships are only examples for the convenience of understanding the functions of the electromagnetic drive mechanism 10 of the present application. The component composition and structural layout of the electromagnetic drive mechanism 10 are not limited to the above-mentioned records. As long as the static magnetic conductive part 11 and the dynamic magnetic conductive part 12 can approach each other under the action of electromagnetic attraction to achieve contact closure of the contact parts, it can be sufficient.

[0044] Further, combined with Figure 2 、 Figure 3 and Figure 4As shown, in some embodiments, the dynamic magnetic member 12 is formed by connecting two separate structures. The dynamic magnetic member 12 includes a dynamic core body 122 and an expansion portion 123 that are connected to each other. The expansion portion 123 is provided at one end of the dynamic core body 122 facing the static magnetic member 11 and is circumferentially arranged around the dynamic core body 122. The surface of the dynamic core body 122 facing the static magnetic member 11 and the surface of the expansion portion 123 facing the static magnetic member 11 together form a second magnetic pole surface 121. The surface of the dynamic core body 122 facing the static magnetic member 11 and the surface of the expansion portion 123 facing the static magnetic member 11 can be flush, and the second magnetic pole surface 121 is a flat surface. The surface of the dynamic core body 122 facing the static magnetic member 11 and the surface of the expansion portion 123 facing the static magnetic member 11 can also be uneven, and the second magnetic pole surface 121 can be considered to be composed of two spaced-apart surfaces. In some embodiments, the dynamic core body 122 includes but is not limited to an iron core structure, and the expansion portion 123 includes but is not limited to an iron ring structure.

[0045] It is understandable that the addition of the expansion portion 123 to the moving core body 122 is beneficial to increasing the area of ​​the second magnetic pole face 121 and the relative area between the first magnetic pole face 111 and the second magnetic pole face 121, thereby increasing the electromagnetic attraction between the moving magnetic member 12 and the static magnetic member 11 when the coil is energized, and is beneficial to reducing the voltage when the moving magnetic member 12 and the static magnetic member 11 are attracted, thereby reducing the power consumption of the coil. At the same time, the moving magnetic member 12 is formed by connecting the two parts of the moving core body 122 and the expansion portion 123, which are separately provided. During the preparation process of the moving magnetic member 12, there is no need to adjust the shape and size of the entire moving magnetic member 12. The moving core body 122 can adopt a standard moving iron core structure, and the shape and size of the expansion portion 123 can be designed to meet the different shape and size specifications of the second magnetic pole face 121, which is beneficial to reducing the design and preparation difficulty of the moving magnetic member 12. Moreover, when replacing or maintaining the dynamic magnetic component 12, such as adjusting the area of ​​the second magnetic pole surface 121 or replacing the damaged expansion part 123, the expansion part 123 can be removed from the dynamic core body 122, and only the expansion part 123 needs to be replaced and maintained, which is beneficial to reducing the preparation and maintenance cost of the dynamic magnetic component 12 and improving the design flexibility of the dynamic magnetic component 12 to meet more different usage requirements.

[0046] It should be noted that in the embodiment shown in the drawings of the present application, the static magnetic member 11 is a static iron core and is provided on the side of the magnetic connecting member 15 facing the dynamic magnetic member 12. The magnetic connecting member 15 may be a yoke iron plate, and the dynamic magnetic member 12 is located between the magnetic connecting member 15 and the magnetic path constraint 16. In other embodiments not shown in the drawings of the present application, the electromagnetic drive mechanism 10 may omit the static iron core. In this case, the static magnetic member 11 may be in the form of a yoke iron plate, the static magnetic member 11 is connected to the magnetic path constraint 16, the dynamic magnetic member 12 is located between the static magnetic member 11 and the magnetic path constraint 16, and the first magnetic pole face 111 is formed by the side of the yoke iron plate forming the static magnetic member 11 facing the dynamic magnetic member 12.

[0047] In some embodiments, the connection method between the dynamic core body 122 and the expansion part 123 includes but is not limited to any applicable fixed connection method such as laser welding, brazing welding, expansion riveting connection, press riveting connection, interference fit, threaded fit, etc., which can be specifically set according to the structural design and connection requirements. Some of the connection methods are used as examples below.

[0048] See Figure 5 、 Figure 6 and Figure 7 As shown, in some embodiments, the outer circumference of the moving core body 122 is provided with a stepped structure. The stepped structure includes a first stepped surface 1221 extending axially along the moving core body 122 and a second stepped surface 1222 facing the static magnetic member 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 the moving core body 122. The expansion portion 123 is sleeved onto the moving core body 122 and arranged corresponding to the stepped structure. The inner circumference of the expansion portion 123 is adapted to mate with the first stepped surface 1221. For example, the radial dimension of the inner circumference of the expansion portion 123 is substantially equal to the radial dimension of the first stepped surface 1221, thereby enhancing the bonding strength between the expansion portion 123 and the moving core body 122. The end surface of the expansion portion 123 facing away from the static magnetic member 11 abuts against the second stepped surface 1222, thereby enabling the expansion portion 123 and the moving core body 122 to be mutually restrained in the axial direction.

[0049] In this embodiment, the moving core body 122 and the expansion part 123 can be prepared separately, and then Figure 6The expansion portion 123 is sleeved onto the end of the dynamic core body 122 in the direction of the dotted arrow shown until the end face of the expansion portion 123 abuts the second step surface 1222, and then the dynamic core body 122 and the expansion portion 123 are fixedly connected by any suitable connection process. For example, the inner circumferential surface of the expansion portion 123 and the first step surface 1221 are connected by laser welding; or, a brazing material is provided on the second step surface 1222 and brazing is used for connection; or, for example, the portion of the dynamic core body 122 corresponding to the first step surface 1221 is expanded and riveted so that the first step surface 1221 is tightly connected to the expansion portion 123. When the expansion and riveting connection is adopted, the inner circumferential surface of the expansion portion 123 can be tilted relative to the axial direction of the dynamic core body 122. For example, the radial dimension of the inner circumferential surface can gradually increase in the direction from the dynamic core body 122 to the static magnetic member 11, thereby improving the bonding strength between the dynamic core body 122 and the expansion portion 123 after the expansion and riveting connection.

[0050] See Figure 8 and Figure 9 In other embodiments, the moving core body 122 includes a main body 1223 and a fastening protrusion 1224 protruding from the main body 1223 toward the side of the static magnetic member 11. The radial dimension of the fastening protrusion 1224 may be less than Figure 7 In the embodiment shown, the radial dimension of the first step surface 1221 can be obtained by designing the mold of the moving core body 122, or by forming a fastening protrusion 1224 on the moving core body 122 by cutting or other methods. The expansion portion 123 is sleeved on the fastening protrusion 1224, and the end surface of the expansion portion 123 facing away from the static magnetic component 11 abuts against the surface of the main body 1223 facing the static magnetic component 11 to limit each other in the axial direction, and the inner circumference of the expansion portion 123 is tightly matched with the outer circumference of the fastening protrusion 1224. In this embodiment, the inner circumference of the expansion portion 123 can be inclined to the axial direction of the moving core body 122. For example, in the direction in which the moving core body 122 points to the static magnetic component 11, the radial dimension of the inner circumference of the expansion portion 123 can gradually increase. After the expansion portion 123 is sleeved onto the fastening protrusion 1224, the fastening protrusion 1224 is expanded and riveted so that the outer circumference of the fastening protrusion 1224 is tightly matched with the inner circumference of the expansion portion 123, which is conducive to improving the bonding strength between the expansion portion 123 and the dynamic core body 122. Of course, in this embodiment, any suitable connection method such as gluing, snap-fitting, interference fit, threaded connection, welding, etc. can also be used to achieve the fixed connection between the expansion portion 123 and the dynamic core body 122.

[0051] Please see again Figure 2 、 Figure 3 and Figure 4In some embodiments, the orthographic projection of the first magnetic pole face 111 on the second magnetic pole face 121 coincides with the second magnetic pole face 121, so that the dynamic magnetic member 12 and the static magnetic member 11 can effectively utilize electromagnetic attraction to attract each other. In some embodiments, the static magnetic member 11 includes a static core 112 and an extension 113 that are interconnected. The extension 113 is axially disposed around the static core 112. The connection between the extension 113 and the static core 112 includes, but is not limited to, laser welding, brazing, riveting, or any other suitable method. In some embodiments, the radial dimension of the extension 113 gradually increases in the direction from the dynamic magnetic member 12 to the static magnetic member 11, and the orthographic projection of the extension 113 on the plane where the second magnetic pole face 121 is located is located outside the second magnetic pole face 121. For example, the orthographic projection of the static core 112 on the second magnetic pole face 121 coincides with the second magnetic pole face 121, and the extension 113 is located on the outer periphery of the static core 112. The stationary core 112 may be an iron core structure, and the extension portion 113 may be an iron ring structure.

[0052] With such a configuration, the extension portion 113 can effectively absorb the leakage magnetic flux in the magnetic circuit, improve the magnetic utilization efficiency of the electromagnetic drive mechanism 10, and thus help to improve the electromagnetic attraction between the static magnetic component 11 and the dynamic magnetic component 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 beneficial to compressing the occupied space of the electromagnetic drive mechanism 10. In addition, the extension portion 113 does not participate in the formation of the first magnetic pole surface 111, nor will it cause the magnetic density of the first magnetic pole surface 111 and the second magnetic pole surface 121 to decrease when they are attracted to each other, which is beneficial to taking into account the improvement of the holding force of the dynamic magnetic component 12 and the static magnetic component 11.

[0053] refer to Figure 3 and Figure 4 As shown, in some embodiments, the radial dimension of the expansion portion 123 gradually increases in the direction in which the moving core body 122 points to the static magnetic member 11. Thus, while the area of ​​the second magnetic pole face 121 is increased by providing the expansion portion 123 to enhance the electromagnetic attraction of the moving magnetic member 12 and the static magnetic member 11, it is also beneficial to reduce the consumables and occupied space of the expansion portion 123. It should be noted that the closing element 14 is provided around the moving magnetic member 12 and the static magnetic member 11, and the structure of the closing element 14 can be adapted and adjusted according to the structure of the moving magnetic member 12 and the static magnetic member 11 to provide good protection and limiting effect on the moving magnetic member 12 and the static magnetic member 11. In some embodiments, the closing element 14 can form a sealed space that encloses the moving magnetic member 12 and the static magnetic member 11, which can provide sealing protection for the moving magnetic member 12 and the static magnetic member 11, and reduce the risk of corrosion or oxidation of the moving magnetic member 12 and the static magnetic member 11.

[0054] For example, combined with Figure 2 and Figure 3As shown, in some embodiments, the sealing element 14 includes a first section 141, a second section 142, a third section 143, and a fourth section 144, which are sequentially arranged in the direction from the static magnetic member 11 to the dynamic magnetic member 12. The first section 141, the second section 142, the third section 143, and the fourth section 144 can be sequentially connected and each has a generally annular sheet structure. When the outer circumferential surface of the extension 113 is inclined with respect to the axial direction of the static magnetic member 11, the first section 141 is also inclined with respect to the axial direction of the static magnetic member 11 and is adapted to the outer circumferential surface of the extension 113. For example, in the direction from the dynamic magnetic member 12 to the static magnetic member 11, the radial dimension of the inner circumferential surface of the first section 141 gradually increases. The inner circumferential surface of the first section 141 can abut against the extension 113, or there can be a gap between the inner circumferential surface and the extension 113, thereby providing protection for the static magnetic member 11. The radial dimension of the second segment 142 is greater than that of the fourth segment 144. The second segment 142 is configured to correspond to the sliding stroke of the amplifying portion 123. The fourth segment 144 slidably engages with the moving core body 122. Both the second segment 142 and the fourth segment 144 can be hollow cylindrical structures with equal radial dimensions at all locations. The third segment 143 is connected to the second segment 142 and the fourth segment 144, respectively. The third segment 143 is inclined relative to the axial direction of the moving core body 122 and conforms to the outer circumference of the amplifying portion 123. When the dynamic magnetic conductive member 12 moves to its extreme position away from the static magnetic conductive member 11, the outer circumference of the amplifying portion 123 can abut the inner circumference of the third segment 143. In this embodiment, the magnetic conductive cylinder 17 can be sleeved onto the fourth segment 144.

[0055] In some embodiments, the closing element 14 also includes a fifth section 145 connected to the first section 141. The fifth section 145 can be roughly perpendicular to the axial direction of the static magnetic component 11. The fifth section 145 can be a flange at the end of the closing element 14. The fifth section 145 is attached to the side of the magnetic connecting member 15 facing the dynamic magnetic component 12, so that the closing element 14 can be connected to the magnetic connecting member 15 as a whole, providing good protection and limiting effects for the dynamic magnetic component 12 and the static magnetic component 11.

[0056] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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 above-described embodiments merely represent several implementation methods of the present application. 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 a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An electromagnetic drive mechanism, characterized in that: include: Coil; a static magnetic conductive member fixed relative to the coil; and, a dynamic magnetic conductive member, disposed opposite to the static magnetic conductive member, wherein the dynamic magnetic conductive member can be magnetized to move toward the static magnetic conductive member when the coil is energized; The dynamic magnetic conductive component includes a dynamic core body and an expansion portion that are separately provided and connected to each other. The expansion portion is provided at one end of the dynamic core body facing the static magnetic conductive component and is circumferentially arranged around the dynamic core body.

2. The electromagnetic drive mechanism according to claim 1, characterized in that: The dynamic core body and the amplification part are connected by laser welding, brazing welding, expansion riveting connection, press riveting connection, interference fit or threaded connection.

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

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

5. The electromagnetic drive mechanism according to claim 1, characterized in that: The static magnetic permeable component has a first magnetic pole surface facing the dynamic magnetic permeable component, and the dynamic magnetic permeable component has a second magnetic pole surface facing the static magnetic permeable component. The orthographic projection of the first magnetic pole surface on the second magnetic pole surface coincides with the second magnetic pole surface.

6. The electromagnetic drive mechanism according to claim 5, characterized in that: The static magnetic permeable member includes a static core and an extension portion connected to each other, and the extension portion is arranged around the static core in a circumferential direction.

7. The electromagnetic drive mechanism according to claim 6, characterized in that: The radial dimension of the extension portion gradually increases in the direction from the dynamic magnetic conductive component to the static magnetic conductive component, and the orthographic projection of the extension portion on the plane where the second magnetic pole surface is located is located outside the second magnetic pole surface.

8. The electromagnetic drive mechanism according to claim 7, characterized in that: In the direction from the moving core body to the static magnetic permeable member, the radial dimension of the enlarged portion gradually increases.

9. The electromagnetic drive mechanism according to claim 8, characterized in that: The electromagnetic drive mechanism also includes a closing element, which is arranged around the dynamic magnetic part and the static magnetic part, and the dynamic magnetic part is slidably arranged in the closing element along the axial direction. The closing element includes a first section, a second section, a third section and a fourth section which are arranged in sequence in the direction from the static magnetic part to the dynamic magnetic part. The first section is inclined to the axial direction of the static magnetic part and is adapted to the outer peripheral surface of the extension part. The radial dimension of the second section is larger than that of the fourth section. The second section is arranged corresponding to the amplification part. The fourth section is slidably matched with the dynamic core body. The third section is inclined to the axial direction of the dynamic core body and is adapted to the outer peripheral surface of the amplification part.

10. The electromagnetic drive mechanism according to claim 1, wherein: The electromagnetic drive mechanism further includes a magnetic conductive connecting member and a magnetic circuit constraining member, wherein the dynamic magnetic conductive member is located between the magnetic conductive connecting member and the magnetic circuit constraining member, and the static magnetic conductive member is located on a side of the magnetic conductive connecting member facing the dynamic magnetic conductive member; Alternatively, the electromagnetic drive mechanism further includes a magnetic circuit constraint member, the static magnetic permeable member is connected to the magnetic circuit constraint member, and the dynamic magnetic permeable member is located between the static magnetic permeable member and the magnetic circuit constraint member.

11. A high voltage DC relay, characterized in that: It comprises a contact portion and the electromagnetic drive mechanism according to any one of claims 1 to 10, wherein the static magnetic conductive part and the dynamic magnetic conductive part of the electromagnetic drive mechanism approach each other to drive the contact portion to contact each other.

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