Moving iron core and high voltage DC relay

Abstract

This application relates to a moving iron core and a high-voltage DC relay. The moving iron core includes a moving iron core body, within which a filling groove is provided. The filling groove includes a main groove and at least two sub-grooves. All sub-grooves are arranged circumferentially around the main groove and are connected to the main groove. Adjacent sub-grooves are spaced apart along the circumference of the main groove. The moving iron core body also has an assembly hole, which is connected to the main groove. The assembly hole allows the push rod of the high-voltage DC relay to extend from the outside of the moving iron core body into the main groove. Therefore, the moving iron core of this application, with its main groove and at least two sub-grooves, improves the assembly stability of the moving iron core and the push rod of the high-voltage DC relay. This ensures that during long-term use of the high-voltage DC relay, the moving iron core can still maintain contact and close with the stationary iron core under the driving action of the push rod assembly, thereby extending the service life of the high-voltage DC relay.

Description

Technical Field

[0001] This application relates to the field of relay technology, and in particular to a moving iron core and a high-voltage DC relay. Background Technology

[0002] High-voltage DC relays are core electrical control components in fields such as new energy electric vehicles and energy storage systems. Their reliability directly affects the switching safety of high-voltage circuits and the lifespan of equipment. During relay operation, the contact closure between the moving iron core and the stationary iron core is the key to achieving circuit conduction. However, the moving iron core is subjected to high-frequency impact loads for a long time, causing the moving iron core and the fixed mortise to loosen. This results in an increased gap between the moving and stationary iron cores, making it impossible to maintain a reliable contact gap closure. Utility Model Content

[0003] Therefore, it is necessary to provide a moving iron core to address the above-mentioned problems.

[0004] A type of moving iron core includes:

[0005] The moving iron core body has a filling groove inside, which is used to fill a fixing medium. The filling groove includes a main groove and at least two sub-grooves. All sub-grooves are arranged around the main groove in the circumference and are connected to the main groove. Adjacent sub-grooves are spaced apart in the circumference of the main groove.

[0006] The moving iron core body is also provided with an assembly hole, which is connected to the mother body slot. The assembly hole is used to allow the push rod of the high voltage DC relay to extend from the outside of the moving iron core body into the mother body slot.

[0007] The aforementioned moving iron core filling groove is provided with a main groove and at least two sub-grooves, which improves the assembly stability of the moving iron core and the push rod of the high-voltage DC relay. This ensures that during long-term use of the high-voltage DC relay, the moving iron core can still contact and close with the stationary iron core under the driving action of the push rod assembly, thereby extending the service life of the high-voltage DC relay.

[0008] In one embodiment, the inner peripheral wall of the assembly hole is provided with a first fixing part, which is used to fix and cooperate with a second fixing part provided on the push rod.

[0009] In one embodiment, the first fixing part is configured with an internal thread for engaging with the external thread of the second fixing part; or...

[0010] The first fixing part is constructed as a snap-fit ​​protrusion for engaging with the snap-fit ​​groove of the second fixing part, and / or the first fixing part is constructed as a snap-fit ​​groove for engaging with the snap-fit ​​protrusion of the second fixing part.

[0011] In one embodiment, a first stepped surface is provided at the junction of the mother body groove and the assembly hole along the extension direction of the mother body groove, and the first stepped surface is constructed as a horizontal surface.

[0012] In one embodiment, along the extension direction of the parent groove, from one side of the first stepped surface to the open side of the parent groove, the cross-sectional dimensions of the parent groove gradually increase, or the cross-sectional dimensions of the parent groove remain unchanged.

[0013] In one embodiment, along the extension direction of the parent groove, a second stepped surface is provided at the junction of the sub-groove and the parent groove, and the second stepped surface is constructed as a horizontal surface.

[0014] In one embodiment, the first stepped surface and the second stepped surface are spaced apart along the extension direction of the mother groove.

[0015] In one embodiment, among the multiple sub-slots, every two sub-slots are mirrored based on the central axis of the parent slot.

[0016] In one embodiment, the moving iron core is provided with a first mounting groove along the axial direction of the mounting hole. The first mounting groove is located on the side of the mounting hole away from the mother groove. The first mounting groove is used to arrange the elastic element of the high voltage DC relay.

[0017] This application further proposes a high-voltage DC relay including the moving iron core in some of the above embodiments.

[0018] In one embodiment, the high-voltage DC relay further includes a push rod that extends into the housing groove through a mounting hole;

[0019] A fixed medium is used to fill the filling groove, thereby fixing the moving iron core and the push rod.

[0020] In one embodiment, the fixing medium is an adhesive. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of a high-voltage DC relay according to an embodiment of this application.

[0022] Figure 2 This is a bottom view of a moving iron core according to an embodiment of this application.

[0023] Figure 3 This is a cross-sectional view of a moving iron core according to an embodiment of this application.

[0024] Figure label:

[0025] 100. High-voltage DC relay; 1. Housing; 2. Push rod assembly; 21. Magnetic guide part; 22. Push rod component; 3. Stationary iron core; 30. Second assembly groove; 4. Moving iron core; 401. Moving iron core body;

[0026] 40. First assembly groove; 41. Assembly hole; 42. Filling groove; 421. Mother groove; 4210. First stepped surface; 422. Sub-groove; 4220. Second stepped surface; 5. Fixing medium; 6. Elastic element. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Combination Figure 2 and Figure 3 As shown, the moving iron core 4 according to this application includes a moving iron core body 401, and a filling groove 42 is provided inside the iron core body 401. The filling groove 42 is used to fill the fixing medium 5. The filling groove 42 includes a main groove 421 and at least two sub-grooves 422. All sub-grooves 422 are arranged around the main groove 421 in the circumference, and the sub-grooves 422 are connected to the main groove 421 to form the filling groove 42. And along the circumference of the main groove 421, two adjacent sub-grooves 422 are spaced apart. The moving iron core body 401 is also provided with an assembly hole 41, which is connected to the main groove 421. The assembly hole 41 is used to allow the push rod 22 of the high voltage DC relay 100 to extend from the outside of the moving iron core body 401 into the main groove 421.

[0034] For example, in combination Figures 1 to 3 As shown, the application of the moving iron core 4 in a high-voltage DC relay 100 is illustrated as an example. In some embodiments of this application, the high-voltage DC relay 100 may include a housing 1, a push rod assembly 2, a stationary iron core 3, a moving iron core 4, and a fixing medium 5. The push rod assembly 2, the stationary iron core 3, and the moving iron core 4 are all assembled within the housing 1, and the fixing medium 5 is used to fix the push rod assembly 2 and the moving iron core 4 together.

[0035] For example, the push rod assembly 2 may include a magnetically conductive part 21 and a push rod member 22. The magnetically conductive part 21 is configured to drive the push rod member 22 to move axially along the push rod member 22. When the stationary iron core 3 is fixedly assembled inside the housing 1, the push rod member 22 passes through the stationary iron core 3. When the magnetically conductive part 21 drives the push rod member 22 to move axially along the push rod member 22, the push rod member 22 can move relative to the stationary iron core 3. That is, the stationary iron core 3 is in a fixed state, and the push rod member 22 is in a moving state. Thus, during the long-term use of the high-voltage DC relay 100, since the push rod member 22 is in a moving state, the push rod member 22 can drive the moving iron core 4 to move.

[0036] According to the present application, the moving iron core 4 has a filling groove 42 located in the moving iron core body 401, comprising a main groove 421 and multiple sub-grooves 422. All sub-grooves 422 are arranged circumferentially around the main groove 421 and are connected to the main groove 421 to form the filling groove 42. Adjacent sub-grooves 422 are spaced apart circumferentially from the main groove 421. The fixing medium 5 is injected into the filling groove 42 to fix the portion of the push rod 22 located within the filling groove 42 to the moving iron core body 401. After the fixing medium 5 solidifies, the solid fixing medium 5 and the moving iron core 4 form a connection similar to "gear meshing." For example, the fixing medium 5 can be understood as a component with external teeth, and the moving iron core 4 as a component with internal teeth; the fixing medium 5 and the moving iron core 4 mesh with each other. This improves the bonding force between the moving iron core 4 and the solid fixing medium 5 and prevents the solid fixing medium 5 from rotating relative to the moving iron core 4. It should be noted that in some embodiments of this application, the fixing medium 5 is described as an adhesive material, but this application is not limited to this. For example, the fixing medium 5 can also be other materials with solidification properties like adhesives.

[0037] After the fixed medium 5 filled in the filling groove 42 has completely solidified, it fixes the moving iron core 4 and the push rod 22, keeping them in a relatively static state. Furthermore, because the fixed medium 5 and the moving iron core 4 form a meshing connection, when the push rod 22 is driven to rotate, the "teeth" of the fixed medium 5 abut against the "teeth" of the moving iron core 4, thus restricting the relative rotation of the moving iron core 4 and the fixed medium 5. In other words, to achieve the goal of driving the moving iron core 4 to rotate relative to the fixed medium 5, a large enough torque is required on the moving iron core 4 to break the abutment between the "teeth" of the fixed medium 5 and the "teeth" of the moving iron core 4.

[0038] Because the fixing medium 5 is injected into the filling groove 42 to fix the moving iron core 4 and the push rod 22, it is difficult for the moving iron core 4 and the push rod 22 to rotate relative to each other. This results in high assembly stability between the moving iron core 4 and the push rod 22, reducing the risk of relative rotation. Therefore, according to the present application, the moving iron core 4 can improve the bonding force between the moving iron core 4 and the fixing medium 5, thereby forming a stable fixed connection between the moving iron core 4 and the push rod 22, and further reducing the risk of rotation of the moving iron core 4 relative to the push rod 22 to a certain extent. Because the assembly stability of the moving iron core 4 and the push rod 22 is improved, the risk of rotation of the moving iron core 4 is reduced during long-term use of the high-voltage DC relay 100, allowing the moving iron core 4 and the stationary iron core 3 to close reliably, thus extending the service life of the high-voltage DC relay 100.

[0039] In some embodiments of this application, the inner peripheral wall of the assembly hole 41 is provided with a first fixing part, which is used to fix and cooperate with a second fixing part provided on the push rod 22, so that the moving iron core 4 and the push rod 22 are fixedly connected through the fixed cooperation between the first fixing part and the second fixing part, so as to further improve the assembly stability between the push rod 22 and the moving iron core 4.

[0040] For example, in one embodiment of this application, the second fixing part is constructed with an external thread, and the first fixing part is constructed with an internal thread, thereby achieving a screwed connection between the push rod 22 and the moving iron core 4. The screwed connection allows for precise control of the axial relative position of the push rod 22 and the moving iron core 4 through the screwing depth. Simultaneously, the helix angle of the thread provides a self-locking effect, preventing the push rod 22 from axially loosening due to vibration or external forces before the adhesive cures. Furthermore, the meshing surface of the thread can also share the axial tensile force and part of the circumferential shear force between the push rod 22 and the moving iron core 4, reducing the mechanical stress borne solely by the fixing medium 5, thereby improving the fatigue life of the connection structure formed by the push rod 22, the moving iron core 4, and the fixing medium 5. The guiding effect of the screwed connection ensures the coaxiality of the push rod 22 and the moving iron core 4 during assembly, avoiding uneven stress distribution within the fixing medium 5 after curing due to assembly eccentricity. It is worth noting that the screw connection between the push rod 22 and the moving iron core 4, and the "meshing connection" formed by the fixed medium 5 and the moving iron core 4, create a synergistic enhancement mechanism. Under dynamic operating conditions, the screw connection resists the initial axial and circumferential loads, while the cured colloid in the filling groove 42 provides anti-torsional resistance through its mechanical engagement with the sub-groove 422. The combination of these two significantly improves the connection reliability between the push rod 22 and the moving iron core 4, making it particularly suitable for the high-impact environment of the high-voltage DC relay 100 with frequent start-stop.

[0041] Alternatively, in another embodiment of this application, the second fixing part is constructed as one of a snap-fit ​​protrusion and a snap-fit ​​groove, and the first fixing part is constructed as the other of a snap-fit ​​protrusion and a snap-fit ​​groove, with the snap-fit ​​protrusion engaging with the snap-fit ​​groove. It should be understood that when the second fixing part is constructed as a snap-fit ​​protrusion, the first fixing part is correspondingly constructed as a snap-fit ​​groove; and when the second fixing part is constructed as a snap-fit ​​groove, the first fixing part is correspondingly constructed as a snap-fit ​​protrusion. When the push rod 22 is inserted into the assembly hole 41 of the moving iron core 4, the snap-fit ​​protrusion and the snap-fit ​​groove engage and lock, thereby enabling rapid assembly of the push rod 22 and the moving iron core 4. For example, during the assembly of the push rod 22 and the moving iron core 4, the snap-fit ​​structure allows the push rod 22 and the moving iron core 4 to be pre-positioned in one step through axial insertion, without the need for rotation (such as screw engagement), simplifying the assembly process. The side contact surfaces of the snap-fit ​​protrusion and the groove can directly restrict the relative circumferential rotation between the push rod 22 and the moving iron core 4, thus further reducing the risk of relative rotation between the moving iron core 4 and the push rod 22.

[0042] Combination Figure 1 and Figure 3 As shown, in some embodiments of this application, a first stepped surface 4210 is provided at the junction of the mother groove 421 and the assembly hole 41 along the central axis of the mother groove 421. It can also be understood that the first stepped surface 4210 is the bottom surface of the mother groove 421. The first stepped surface 4210 is constructed as a horizontal plane, that is, the first stepped surface 4210 is a plane perpendicular to the central axis of the mother groove 421. Similarly, the first stepped surface 4210 is also perpendicular to the axial direction of the push rod 22.

[0043] After the fixing medium 5 is injected into the filling groove 42 and cured, the fixing medium 5 fills the filling groove 42. Since the first stepped surface 4210 is a horizontal plane, the part of the cured fixing medium 5 that contacts the first stepped surface 4210 also forms a plane perpendicular to the axial direction of the push rod 22. This planar structure allows the fixing medium 5 to directly form a large-area fit with the first stepped surface 4210 of the moving iron core 4 in the axial direction. Therefore, when the moving iron core 4 is subjected to a force along the axial direction of the push rod 22 (such as the inertial force of the moving iron core 4 during the process of the push rod 22 driving the moving iron core 4 to move), the planar area of ​​the cured colloid provides axial support for the moving iron core 4, thus strengthening the axial assembly stability of the moving iron core 4 and the push rod 22.

[0044] See Figure 3As shown, in some embodiments of this application, along the axial direction of the mother groove 421, from one side of the first stepped surface 4210 to the side of the opening of the mother groove 421, the cross-sectional dimensions of the mother groove 421 gradually increase. This can also be understood as the sidewall of the mother groove 421 being designed as an outwardly inclined conical surface or a stepped flared structure, so that the cross-sectional area of ​​the mother groove 421 at the opening is larger than the cross-sectional area near the first stepped surface 4210. Because the cross-sectional dimensions of the mother groove 421 gradually increase, a guide channel with a "wide entrance and narrow bottom" is formed during the glue injection process. This not only facilitates the addition of liquid fixative medium 5 into the filling tank 42, but also ensures that when the liquid fixative medium 5 is injected from the opening of the mother tank 421, the flow path of the liquid fixative medium 5 is naturally guided to the first step surface 4210 and the sub-tank 422 as the cross-section of the mother tank 421 gradually contracts, thus ensuring that the colloid is preferentially filled to the bottom of the filling tank 42 (i.e., near the first step surface 4210 in the filling tank 42).

[0045] Alternatively, in some other embodiments of this application, the cross-sectional dimensions of the parent groove 421 remain unchanged along its axial direction. This can also be understood as the cross-sectional dimensions of the parent groove 421 remaining consistent from one side of the first stepped surface 4210 to the open side of the parent groove 421. It should be understood that in some embodiments, the parent groove 421 is divided into multiple sequentially arranged cross-sections along its axial direction, each with a shape that can be the same or different. For example, one layer of cross-sections may be quadrilateral, another layer may be pentagonal, or each layer of cross-sections may be circular or quadrilateral, etc.

[0046] Combination Figure 1 and Figure 3As shown, in some embodiments of this application, along the extension direction of the parent groove 421, a second stepped surface 4220 is provided at the junction of the sub-groove 422 and the parent groove 421. The second stepped surface 4220 is constructed as a horizontal plane. It can also be understood that the second stepped surface 4220 is the bottom surface of the sub-groove 422. The second stepped surface 4220 is constructed as a horizontal plane, meaning it is a plane perpendicular to the central axis of the parent groove 421. Similarly, the second stepped surface 4220 is also perpendicular to the axial direction of the push rod 22. When the fixing medium 5 is injected into the filling groove 42 and solidifies, the fixing medium 5 fills the filling groove 42. Since the second stepped surface 4220 is a horizontal plane, the portion of the solidified fixing medium 5 in contact with the second stepped surface 4220 also forms a plane perpendicular to the axial direction of the push rod 22. This planar structure allows the fixed medium 5 to directly form a large-area contact with the second stepped surface 4220 of the moving iron core 4 in the axial direction. Thus, when the moving iron core 4 is subjected to an axial force along the push rod 22 (such as the inertial force of the moving iron core 4 during the process of the push rod 22 driving the moving iron core 4 to move), the planar area of ​​the cured colloid provides axial support for the moving iron core 4, thereby enhancing the axial assembly stability of the moving iron core 4 and the push rod 22.

[0047] Combination Figure 1 and Figure 3 As shown in some embodiments of this application, the first stepped surface 4210 and the second stepped surface 4220 are spaced apart along the extension direction of the mother groove 421. Because the first stepped surface 4210 and the second stepped surface 4220 are spaced apart, the fixing medium 5 forms a double-layer structure within the filling groove 42. When the moving iron core 4 applies a force to the fixing medium 5 due to a load along the axial direction of the push rod 22, the double-layer structure of the fixing medium 5 divides the transmission path between the moving iron core 4 and the fixing medium 5 into two levels: one level is the transmission through the plane formed by the first stepped surface 4210 within the fixing medium 5, and the other level is the transmission through the plane formed by the second stepped surface 4220. This disperses the force transmission, reduces the risk of stress concentration, and thus improves the connection stability between the push rod 22, the moving iron core 4, and the fixing medium 5.

[0048] See Figure 2 As shown, in some embodiments of this application, in a plurality of sub-slots 422, every two sub-slots 422 are mirrored based on the central axis of the parent slot 421. For example, see [link to relevant documentation]. Figure 2As shown, in one embodiment of this application, the filling groove 42 has four sub-grooves 422, and each pair of the four sub-grooves 422 is arranged in a mirror image based on the central axis of the parent groove 421. When a circumferential torque is generated between the moving iron core 4 and the push rod 22, the fixed medium 5 in the symmetrical sub-grooves 422 is simultaneously subjected to shear forces in opposite directions, thereby forming a self-balancing anti-torsional resistance in the circumferential direction. This symmetrical force-bearing mode can avoid the risk of local peeling caused by unilateral overload and significantly improve the connection stability among the push rod 22, the moving iron core 4, and the fixed medium 5.

[0049] Combination Figure 1 and Figure 3 As shown, in some embodiments of this application, the moving iron core 4 is provided with a first mounting groove 40. Along the axial direction of the mounting hole 41, the first mounting groove 40 is located on the side of the mounting hole 41 away from the mother groove 421. The first mounting groove 40 is used to arrange the elastic element 6 of the high voltage DC relay 100.

[0050] For example, see Figure 1 As shown, in one embodiment of this application, the elastic element 6 is constructed as a helical spring, but this application is not limited to this. In other embodiments of this application, the elastic element 6 can also be a cylindrical elastic rubber element, etc. The helical spring is sleeved on the push rod 22, and along the length direction of the helical spring, one end of the helical spring is assembled in the second mounting groove 30, and the other end of the helical spring is assembled in the first mounting groove 40. The second mounting groove 30 and the first mounting groove 40 can jointly limit the helical spring. The helical spring disposed between the stationary iron core 3 and the moving iron core 4 can realize the rapid reset of the moving iron core 4. For example, when the magnetic guide 21 drives the push rod 22 to move the moving iron core 4 towards the stationary iron core 3 to contact and close, the helical spring (i.e., the elastic element 6) is compressed, and the elastic force of the helical spring offsets part of the impact energy, reducing the mechanical stress at the moment of collision between the moving iron core 4 and the stationary iron core 3; when the magnetic guide 21 is de-energized, the restoring force of the elastic element 6 drives the moving iron core 4 to reset quickly, ensuring that the moving iron core 4 and the stationary iron core 3 can be separated in time.

[0051] Combination Figures 1 to 3As shown, the high-voltage DC relay 100 according to this application includes a moving iron core 4, a push rod 22, and a fixing medium 5 as described in some of the above embodiments. Since the fixing medium 5 is injected into the filling groove 42 to fix the moving iron core 4 and the push rod 22, it is difficult for the moving iron core 4 and the push rod 22 to rotate relative to each other. This results in high assembly stability between the moving iron core 4 and the push rod 22, reducing the risk of relative rotation. With the improved assembly stability of the moving iron core 4 and the push rod 22, the risk of rotation of the moving iron core 4 is reduced during long-term use of the high-voltage DC relay 100, allowing the moving iron core 4 to reliably close with the stationary iron core 3, thereby extending the service life of the high-voltage DC relay 100.

[0052] 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.

[0053] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A moving iron core, characterized by, include: The moving iron core body has a filling groove inside, which is used to fill a fixing medium. The filling groove includes a main groove and at least two sub-grooves. All the sub-grooves are arranged around the main groove in the circumference and are connected to the main groove. Adjacent sub-grooves are spaced apart in the circumference of the main groove. The moving iron core body is also provided with an assembly hole, which is connected to the mother slot. The assembly hole is used to allow the push rod of the high voltage DC relay to extend from the outside of the moving iron core body into the mother slot.

2. The moving iron core of claim 1, wherein The inner peripheral wall of the assembly hole is provided with a first fixing part, which is used to fix and cooperate with the second fixing part provided on the push rod.

3. The moving iron core of claim 2, wherein, The first fixing part is constructed with an internal thread for engaging with the external thread of the second fixing part; or... The first fixing part is configured as a snap-fit ​​protrusion for snap-fitting with the snap-fit ​​groove of the second fixing part, and / or the first fixing part is configured as a snap-fit ​​groove for snap-fitting with the snap-fit ​​protrusion of the second fixing part.

4. The moving iron core of claim 1, wherein Along the extending direction of the mother body groove, a first stepped surface is provided at the junction of the mother body groove and the assembly hole, and the first stepped surface is constructed as a horizontal surface.

5. The moving iron core of claim 4, wherein, Along the extension direction of the mother groove, from one side of the first stepped surface to the open side of the mother groove, the cross-sectional dimensions of the mother groove gradually increase, or the cross-sectional dimensions of the mother groove remain unchanged.

6. The moving iron core of claim 4, wherein, Along the extension direction of the parent groove, a second stepped surface is provided at the junction of the sub-groove and the parent groove, and the second stepped surface is constructed as a horizontal surface.

7. The moving iron core of claim 6, wherein, Along the extending direction of the mother body groove, the first stepped surface and the second stepped surface are spaced apart.

8. The moving iron core of claim 1, wherein, In the plurality of said sub-slots, every two said sub-slots are mirrored based on the central axis of said parent slot.

9. The moving iron core according to claim 1, characterized in that, The moving iron core is provided with a first mounting groove along the axial direction of the mounting hole. The first mounting groove is located on the side of the mounting hole away from the mother groove. The first mounting groove is used to arrange the elastic element of the high voltage DC relay.

10. A high voltage DC relay characterized by, include: The moving iron core according to any one of claims 1 to 9.

11. The high-voltage DC relay according to claim 10, characterized in that Also includes: A push rod, which extends into the mother body groove through the assembly hole; A fixing medium is used to fill the filling groove, thereby fixing the moving iron core to the push rod.

12. The high-voltage DC relay according to claim 11, characterized in that The fixing medium is adhesive.

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