Magnetic device and power equipment

Abstract

The invention provides a magnetic device and power equipment, and relates to the technical field of heat dissipation. The magnetic device comprises a magnetic core, the magnetic core comprises a middle column and a bottom wall, and one end of the middle column is connected with one side of the bottom wall. The middle column comprises a groove, the groove is sunken in the direction from the circumferential side face of the middle column to the axis of the middle column, and the groove penetrates through the middle column in the axial direction of the middle column. The bottom wall comprises a through hole, the through hole penetrates through the bottom wall in the axial direction of the middle column, and the through hole communicates with the groove. According to the magnetic device, the groove and the through hole which are communicated in the axial direction of the middle column are formed between the middle column and the bottom wall, the air channel in the axial direction of the middle column can be formed in the contact area of the middle column of the magnetic core and the coil, and therefore heat dissipation of the magnetic device can be achieved through circulation of air in the air channel; the heat dissipation efficiency of the magnetic device can be improved, and the performance of the power equipment applying the magnetic device can be further improved.

Description

Technical Field

[0001] The present application relates to the field of heat dissipation technology, and in particular to a magnetic device and a power device. Background Art

[0002] At present, the number of magnetic devices in power equipment is increasing, and the layout of magnetic devices is becoming more and more compact, which also puts higher requirements on the miniaturization design of magnetic devices, which makes the power density of power equipment increase sharply.

[0003] In order to achieve the miniaturization design of magnetic devices, a design scheme of coupling multiple magnetic devices by magnetic circuits is usually adopted at present, so that multiple magnetic devices share a magnetic core, thereby achieving the purpose of reducing the volume of multiple magnetic devices. However, in magnetic devices using the above-mentioned magnetic circuit coupling design, there is usually a magnetic saturation area, which will cause a local high temperature area in the magnetic device. In addition, the temperature of the contact area between the middle column of the magnetic device and the coil is also high, which makes the overall temperature of the magnetic device high. If the magnetic device cannot be effectively cooled in time, it will affect the performance of the magnetic device, and it will also limit the performance of the power device product, thereby limiting the application scenarios of the magnetic device. Summary of the invention

[0004] The present application provides a magnetic device and a power device, which are used to improve the heat dissipation efficiency of the magnetic device, thereby improving the performance of the power device using the magnetic device.

[0005] In the first aspect, the present application provides a magnetic device, which may include a magnetic core, the magnetic core includes a middle column and a bottom wall, the middle column is arranged on one side of the bottom wall, and one end of the middle column is connected to the bottom wall. The middle column includes a groove, the groove is recessed along the peripheral side of the middle column in the direction of the axis of the middle column, and the groove penetrates the middle column along the axial direction of the middle column. The bottom wall includes a through hole, the through hole penetrates the bottom wall along the axial direction of the middle column, and the through hole is connected to the groove. Using the magnetic device provided by the present application, by providing a groove and a through hole connected along the axial direction of the middle column between the middle column and the bottom wall of the magnetic core, an air duct that penetrates the middle column and the bottom wall along the axial direction of the middle column can be formed in the contact area between the middle column of the magnetic core and the coil, so that the heat dissipation of the magnetic device can be achieved by the circulation of air in the air duct, which is conducive to improving the heat dissipation efficiency of the magnetic device, and further can improve the performance of the power device using the magnetic device.

[0006] In a possible implementation of the present application, the center column may be provided with a plurality of grooves, which are arranged at intervals along the circumference of the center column. By providing a plurality of grooves on the center column, the number of air ducts passing through the center column and the bottom wall can be effectively increased, thereby improving the heat dissipation efficiency of the magnetic device.

[0007] In addition, the bottom wall includes one or more through holes, and the projection of each through hole in a plane perpendicular to the axis of the center column coincides with the projection of a groove in a plane perpendicular to the axis of the center column. This can effectively increase the ventilation area of ​​the magnetic core, and can also reduce the material used in the magnetic core, thereby reducing the cost of the magnetic device.

[0008] In the present application, the specific arrangement of the through hole of the bottom wall is not limited. In a possible implementation, the hole wall of the through hole may include an arcuate surface and two planes, and the projection of the arcuate surface in the plane perpendicular to the axis of the center column coincides with the projection of a groove in the plane perpendicular to the axis of the center column. In addition, the two planes are respectively connected to an edge of the arcuate surface, and the angle between the two planes toward the arcuate surface is an acute angle. The through hole of the bottom wall is set to the above shape, which can have less impact on the magnetic circuit of the magnetic device, so that the magnetic loss of the magnetic device is small, thereby ensuring the magnetic inductance of the magnetic device while achieving ventilation and heat dissipation of the magnetic core.

[0009] In a possible implementation of the present application, the magnetic core further includes two side walls, the two side walls and the center column are located on the same side of the bottom wall, and the two side walls are located on opposite sides of the center column along the radial direction of the center column. In addition, a plane passing through the axis of the center column and perpendicular to the two side walls passes through at least one groove. This can help increase the distance between the side wall and the center axis, thereby effectively reducing the magnetic saturation region of the magnetic device to reduce the high temperature region of the magnetic device.

[0010] In a possible implementation of the present application, the size of the bottom wall can be smaller to reduce the material used in the magnetic core and reduce the cost of the magnetic core. In addition, the bottom wall can be provided with a through groove, which is recessed along the edge of the bottom wall in the direction of the axis of the middle column, and the through groove penetrates the bottom wall along the axial direction of the middle column, and the through groove is connected to the groove. In addition, the magnetic device can also include a support frame, which includes a windshield, which can be buckled in the notch of the through groove, and the windshield and the through groove form a hollow channel. In this way, the air entering the magnetic device along the axial direction of the middle column can circulate in the hollow channel, thereby increasing the air volume flowing through each magnetic core of the magnetic device, which is beneficial to improving the heat dissipation efficiency of the magnetic device.

[0011] In addition, the bracket may further include a sleeve, which may be sleeved on the middle column. Based on this, the coil of the magnetic device may be wound on the sleeve, so that the coil and the magnetic core may be assembled synchronously when the sleeve is sleeved on the middle column, which may be conducive to realizing the automated assembly of the magnetic device, so as to improve the production efficiency of the magnetic device.

[0012] In a possible implementation of the present application, the magnetic device may include multiple magnetic cores, which are connected in sequence and the axes of the central columns of the multiple magnetic cores coincide. Then, the magnetic device is a coupled magnetic structure, which is beneficial to reducing the volume of the magnetic device and reducing the cost of the magnetic device.

[0013] In addition, the magnetic device further comprises a plurality of coils, each coil being wound around the middle column of the corresponding magnetic core, and the plurality of coils being arranged at intervals along the axial direction of the middle column.

[0014] In another possible implementation of the present application, the magnetic device may include a plurality of magnetic cores, the middle columns of the plurality of magnetic cores are arranged side by side, each of the plurality of coils of the magnetic device is wound around the middle column of the corresponding magnetic core, and the plurality of coils are arranged in a direction perpendicular to the axis of the middle column. In addition, in the present application, the plurality of magnetic cores may be an integrally formed structure, and the plurality of middle columns of the plurality of magnetic cores are all located between two bottom walls arranged oppositely, which is conducive to reducing the material used for the magnetic core, so as to reduce the cost of the magnetic device, and is also conducive to reducing the volume of the magnetic device and improving the structural reliability of the magnetic device.

[0015] In a second aspect, the present application further provides a power device, which includes a housing and a magnetic device according to the first aspect, wherein the magnetic device can be accommodated in the housing, and the magnetic device can be used to realize the power conversion function of the power device. Since the magnetic device provided in the embodiment of the present application has a high heat dissipation efficiency, the power device using the magnetic device has better performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a charging network provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of a coupled magnetic structure of an inductor and a transformer provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of the structure of a magnetic device provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of the structure of a magnetic core provided in an embodiment of the present application;

[0020] Figure 5 for Figure 4 A schematic structural diagram of the magnetic core at another angle shown in FIG.

[0021] Figure 6 for Figure 5 A C-direction view of the magnetic core shown in FIG.

[0022] Figure 7 for Figure 5 D-direction view of the magnetic core shown in ;

[0023] Figure 8 An internal magnetic circuit diagram of a magnetic core of a magnetic device provided in an embodiment of the present application;

[0024] Figures 9a to 9e A schematic diagram of the shape of the through hole of the magnetic core provided in an embodiment of the present application;

[0025] Fig.10 for Figure 3 A schematic diagram of an exploded structure of a magnetic device provided in;

[0026] Fig.11 for Figure 3 An E-direction view of the magnetic device shown in FIG.

[0027] Fig.12 A schematic diagram of the structure of a support frame provided in an embodiment of the present application;

[0028] Fig.13 A schematic diagram of the structure of a magnetic device provided in an embodiment of the present application from another angle;

[0029] Fig.14 for Fig.13 EE cross-sectional view of the magnetic device shown in;

[0030] Fig.15 Another structural schematic diagram of a magnetic device provided in an embodiment of the present application;

[0031] Fig.16 Another schematic diagram of the structure of the magnetic device provided in the embodiment of the present application.

[0032] Reference numerals:

[0033] 100-charging pile; 1001-rectifier; 1002-connector;

[0034] 200-transformer; 300-inductor;

[0035] 1-magnetic core; 101-middle column; 1011-groove; 102-bottom wall; 1021-through hole; 10211-arc surface; 10212-plane; 1022-through slot;

[0036] 103 - side wall; 2 - coil; 3 - support frame; 301 - windshield; 302 - sleeve. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted. The words expressing position and direction described in the embodiments of the present application are all illustrated by taking the accompanying drawings as examples, but changes may be made as needed, and the changes made are all included in the scope of protection of the present application. The drawings of the embodiments of the present application are only used to illustrate the relative position relationship, and they do not represent the true proportion.

[0038] It should be noted that specific details are described in the following description to facilitate understanding of the present application. However, the present application can be implemented in a variety of other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific implementation methods disclosed below.

[0039] In order to facilitate the understanding of the magnetic device provided in the embodiment of the present application, its application scenario is first described below. The magnetic device can be, but is not limited to, a device for realizing power conversion such as a transformer or an inductor. In addition, the magnetic device can be used in scenarios such as energy storage systems, photovoltaic power generation systems, or charging networks. Taking the charging station scenario as an example, refer to Figure 1 , Figure 1 A schematic diagram of a charging network provided in an embodiment of the present application. The charging network may include multiple charging piles 100, and the charging piles 100 include a rectifier 1001 and a connector 1002, wherein the rectifier 1001 can convert AC power into DC power through a magnetic device and output it to the connector 1002, and the connector 1002 can be connected to a powered device (such as a vehicle) to replenish energy to the powered device.

[0040] As the power of power devices such as rectifier 1001 increases, the power of magnetic devices in power devices is also getting higher. In addition, as the number of magnetic devices in power devices increases, the layout of magnetic devices becomes more compact and the volume of magnetic devices becomes smaller, resulting in a higher power density of magnetic devices. At present, in order to achieve a miniaturized design of high-power density magnetic devices, a plurality of magnetic devices can be arranged with a common magnetic core by means of magnetic circuit coupling, so as to achieve the purpose of reducing the volume while satisfying the magnetic inductance of each magnetic device. For example, refer to Figure 2 , Figure 2 A schematic diagram of a coupled magnetic structure of an inductor 300 and a transformer 200 provided in an embodiment of the present application. Figure 2In the coupled magnetic structure shown, the coil of the inductor 300 and the coil of the transformer 200 are both wound on the middle column of the same group of connected magnetic cores 1, and the coil of the inductor 300 and the coil of the transformer 200 are arranged at intervals. In the process of operation of the coupled magnetic structure, the magnetic flux generated by the inductor 300 and the magnetic flux generated by the transformer 200 are offset at the connection between the two. In this way, the volume of the coupled magnetic structure can be reduced while avoiding affecting the magnetic properties of the inductor 300 and the transformer 200.

[0041] However, in the above-mentioned coupled magnetic structure, there is a local magnetic saturation region at the connection between the middle column and the bottom wall of the magnetic core 1, for example Figure 2 The area shown at A in the figure is usually located on the path with the minimum magnetic resistance. The local magnetic saturation of the magnetic device will lead to a decrease in the magnetic induction of the magnetic device and cause local high temperature of the magnetic device. In addition, there is also a local high temperature area in the contact area between the coil and the middle column of the magnetic device, such as Figure 2 The area shown at B in the figure makes the temperature of the entire magnetic device higher. If there is no good heat dissipation measure, the performance of the magnetic device will be reduced, thus limiting the application scenarios of the magnetic device.

[0042] In view of this, the magnetic device provided in the embodiment of the present application forms an air duct in the contact area between the coil and the middle column by opening a through hole on the magnetic core that penetrates the middle column and the bottom wall along the axial direction of the middle column, thereby effectively improving the heat dissipation efficiency of the magnetic device, which is beneficial to improving the product performance of the power device using the magnetic device. The magnetic device provided in the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] Reference Figure 3 , Figure 3 A schematic diagram of a structure of a magnetic device provided in an embodiment of the present application. The magnetic device comprises a magnetic core 1 and a coil 2. In the present application, the magnetic core 1 refers to a structure formed by a magnetic material, and illustratively, it can be a magnetic metal oxide structure formed by sintering various iron oxide mixtures.

[0044] Reference Figure 4 , Figure 4A structural schematic diagram of a magnetic core 1 provided in an embodiment of the present application. The magnetic core 1 includes a center column 101 and a bottom wall 102, wherein the center column 101 is located on one side of the bottom wall 102, and one end of the center column 101 is connected to the bottom wall 102. The center column 101 has a groove 1011, and the groove 1011 is recessed along the peripheral side of the center column 101 in the direction of the axis of the center column 101, and the groove 1011 penetrates the center column 101 along the axial direction of the center column 101. In the present application, the projection shape of the groove 1011 in the first projection plane is not limited, and it can be exemplarily a regular shape such as a circular arc, an elliptical arc or a rectangle, or it can be some possible irregular shapes. In the present application, the first projection plane can be any plane perpendicular to the axis of the center column 101.

[0045] In addition, the center column 101 may be provided with a plurality of grooves 1011, the projection shapes of the plurality of grooves 1011 in the first projection plane may be the same or different, and along the circumference of the center column 101, the plurality of grooves 1011 may be arranged at equal or unequal intervals, which are not limited in the present application. Figure 4 In the magnetic core 1 shown, the center column 101 may be provided with four arc-shaped grooves, and along the circumference of the center column 101 , the four arc-shaped grooves are arranged at equal intervals.

[0046] It is understandable that the provision of multiple grooves 1011 on the middle column 101 can not only improve the heat dissipation effect of the magnetic core 1 , but also reduce the material used in the magnetic core 1 , thereby reducing the cost of the magnetic core 1 .

[0047] Reference Figure 5 , Figure 5 for Figure 4 The bottom wall 102 of the magnetic core 1 may also be provided with a through hole 1021, which penetrates the bottom wall 102 along the axial direction of the middle column 101, and the through hole 1021 is connected with the groove 1011 to connect the middle column 101 with the other side of the bottom wall 102, so as to facilitate the air on the other side of the bottom wall 102 to flow toward the middle column 101, so as to achieve heat dissipation for the middle column 101.

[0048] You can continue to refer to Figure 5 In the magnetic core 1 provided in the embodiment of the present application, the projection area of ​​the through hole 1021 in the first projection plane may be larger than the projection area of ​​the groove 1011 in the first projection plane, and a portion of the projection of the through hole 1021 in the first projection plane may coincide with the projection of a groove 1011 in the first projection plane.

[0049] In the embodiment of the present application, the number of through holes 1021 of the bottom wall 102 of the magnetic core 1 is not limited, and can be one or more, and the number of through holes 1021 of the bottom wall 102 can be the same as or different from the number of grooves 1011 of the middle column 101. Figure 4 and Figure 5 In the magnetic core 1 shown, the bottom wall 102 includes two through holes 1021, and the middle column 101 includes four grooves 1011, and each through hole 1021 is respectively connected to one groove 1011. It is worth mentioning that in the embodiment of the present application, the through holes 1021 of the bottom wall 102 and the corresponding grooves 1011 of the middle column 101 can be processed through the same process, which can effectively improve the processing efficiency of the magnetic core 1.

[0050] It can be understood that in the magnetic core 1 provided in the embodiment of the present application, by setting a through hole 1021 on the bottom wall 102, the ventilation area of ​​the bottom wall 102 can be increased, thereby increasing the air volume passing through the middle column 101 while effectively reducing the material used in the magnetic core 1 to reduce the cost of the magnetic core 1.

[0051] In the magnetic device provided in the embodiment of the present application, the specific location of the through hole 1021 on the bottom wall 102 is not limited. For example, the through hole 1021 can be set on the path with the smallest magnetic resistance of the magnetic core 1, thereby reducing or even eliminating the magnetic saturation area of ​​the magnetic device to reduce the high temperature area of ​​the magnetic device. Figure 4 and Figure 5 The magnetic core 1 may further include two side walls 103 , which are located on the same side of the bottom wall 102 as the center column 101 , are connected to the bottom wall 102 , and are disposed on two opposite sides of the center column 101 .

[0052] It can be understood that in the magnetic core 1, the smaller the distance between the middle column 101 and the side wall 103 is, the smaller the corresponding magnetic resistance is. Therefore, the magnetic core 1 has the smallest magnetic resistance at the point where the distance between the middle column 101 and the side wall 103 is the smallest. Figure 6 , Figure 6 for Figure 5 In the magnetic core 1 provided in the embodiment of the present application, a plane passing through the axis of the middle column 101 and perpendicular to the two side walls 103 passes through at least one through hole 1021, for example, Figure 6In the magnetic core 1 shown, a plane PP passing through the axis of the center column 101 and perpendicular to the two side walls 103 passes through the two through holes 1021, so that the distance between the center column 101 and the two side walls 103 at all locations can be larger, thereby achieving the purpose of reducing the magnetic saturation region of the magnetic device. Since each through hole 1021 can be obtained by the same process as a groove 1011, the plane PP passing through the axis of the center column 101 and perpendicular to the two side walls 103 passes through the through hole 1021 and also passes through the corresponding groove 1011.

[0053] In addition, the present application does not limit the specific location of the other grooves 1011 of the center column 101. For example, Figure 6 In the magnetic core 1 shown, the two grooves 1011 of the middle column 101 may be symmetrically arranged relative to the plane PP passing through the axis of the middle column 101 and perpendicular to the two side walls 103 .

[0054] In the embodiment of the present application, the projection shape of the through hole 1021 in the first projection plane is not limited. For example, reference may be made to Figure 7 , Figure 7 for Figure 5 The D-direction view of the magnetic core 1 shown in FIG. Figure 7 It can be used to show the projection of the magnetic core 1 within the first reference plane. Figure 7 In the magnetic core 1 shown, the projection shape of the through hole 1021 in the first projection plane is drop-shaped, which can also be understood as the projection shape of the through hole 1021 in the first projection plane is fan-shaped, wherein the portion where the projection of the through hole 1021 in the first projection plane overlaps with the projection of the groove 1011 in the first projection plane is arc-shaped, then the groove 1011 can be an arc-shaped groove, and the hole wall of the through hole 1021 includes an arc-shaped surface 10211, then the projection of the arc-shaped surface 10211 in the first projection plane overlaps with the projection of the groove 1011 in the first projection plane. In addition, the hole wall of the through hole 1021 also includes two planes 10212, and the two planes 10212 are located on the side of the curved surface 10211 that is away from the axis of the central column 101. The two planes 10212 are respectively connected to an edge of the curved surface 10211, and the angle between the two planes 10212 toward the curved surface 10211 is an acute angle. Then, the projection of the through hole 1021 in the first projection plane is arranged in a contracted shape along the direction from the central column 101 to the side wall 103.

[0055] In addition, please refer to Figure 8 , Figure 8 An internal magnetic circuit diagram of a magnetic core 1 of a magnetic device provided in an embodiment of the present application. Figure 8It can be seen that the projection shape of the through hole 1021 of the bottom wall 102 of the magnetic core 1 in the first projection plane is the above-mentioned teardrop-like shape or fan-shaped, which can make the setting of the through hole 1021 have less influence on the magnetic circuit of the magnetic device, so that the magnetic loss of the magnetic device is smaller, thereby ensuring the magnetic inductance of the magnetic device while achieving ventilation and heat dissipation of the magnetic core 1.

[0056] It is worth mentioning that in the magnetic device provided in the embodiment of the present application, the magnetic core 1 can be an integrally formed structure, which can effectively simplify the magnetic structure and improve the structural reliability of the magnetic core 1.

[0057] In the magnetic device provided in the embodiment of the present application, the through hole 1021 of the bottom wall 102 of the magnetic core 1 can be set to other possible shapes besides the above-mentioned teardrop-like shape or fan-shaped shape. Figure 9a In the magnetic core 1 shown in FIG. 1 , the through hole 1021 of the bottom wall 102 may be a circular hole. Figure 9b In the magnetic core 1 shown in FIG. 1 , the through hole 1021 of the bottom wall 102 is an elliptical hole. Fig.9c In the magnetic core 1 shown in FIG. 1 , the through hole 1021 of the bottom wall 102 is a rectangular hole. Figure 9d In the magnetic core 1 shown in FIG. 1 , the through hole 1021 of the bottom wall 102 is a triangular hole. Fig.9e In the magnetic core 1 shown, the through hole 1021 of the bottom wall 102 passes through the edge of the bottom wall 102 away from the axis of the middle column, and the through hole 1021 has an opening at the edge of the bottom wall 102 away from the axis of the middle column. The above is only an exemplary description of the possible shapes of the through hole 1021 of the magnetic core 1. In other possible embodiments of the present application, the through hole 1021 can also be a hole of other regular or irregular shapes, which will not be introduced one by one here, but they should all be understood to fall within the protection scope of the present application.

[0058] It is understandable that the magnetic core 1 of the magnetic device provided in the embodiment of the present application can still be processed by using the existing molding process, which is beneficial to reducing the processing cost of the magnetic core 1.

[0059] From the above introduction to the coupled magnetic structure, it can be seen that the coupled magnetic structure may include a plurality of coils 2 and a plurality of connected magnetic cores 1, wherein each coil 2 may be wound around the middle column 101 of the corresponding magnetic core 1 to achieve its corresponding function. Fig.10 , Fig.10 for Figure 3 A schematic diagram of an exploded structure of a magnetic device provided in the invention comprises a plurality of magnetic cores 1 and a plurality of coils 2, wherein the axes of the middle columns 101 of the plurality of magnetic cores 1 coincide with each other, and the plurality of magnetic cores 1 are connected to each other, and the connection method thereof may be but is not limited to bonding.

[0060] In addition, the plurality of coils 2 can be respectively wound around the corresponding middle column 101 of the magnetic core 1, and the plurality of coils 2 are arranged at intervals along the axial direction of the middle column 101, and two adjacent coils 2 are separated by the bottom wall 102. Fig.11 , Fig.11 for Figure 3 The E-direction view of the magnetic device shown in FIG. Since the center column 101 of the magnetic core 1 is provided with a groove 1011, when the coil 2 is wound on the center column 101, the coil 2 can block the notch of the groove 1011 to form a hollow channel extending along the axial direction of the center column 101 between the coil 2 and the center column 101, and the hollow channel is connected to the outside of the magnetic device. In this way, the contact area between the coil 2 and the center column 101 can be cooled by allowing air to flow in the axial direction of the center column 101 in the hollow channel, thereby achieving heat dissipation of the magnetic device.

[0061] It is understandable that in Figure 3 In the magnetic device shown, the grooves 1011 and through holes 1021 of each magnetic core 1 are arranged in the same position and quantity, and along the axial direction of the middle column 101, the grooves 1011 of each magnetic core 1 are arranged one by one and are connected, so that after the air outside the magnetic device enters the magnetic device through the bottom wall 102 of the magnetic core 1, it can pass through each magnetic core 1 and the corresponding coil 2 in sequence along the axial direction of the middle column 101 to achieve heat dissipation for each magnetic core 1 and the corresponding coil 2.

[0062] You can continue to refer to Fig.11 In the magnetic device provided in the embodiment of the present application, the bottom wall 102 of the magnetic core 1 may also be provided with a through groove 1022, which is recessed from the edge of the bottom wall 102 toward the axis of the center column 101, and the through groove 1022 penetrates the bottom wall 102 along the axial direction of the center column 101, and the through groove 1022 may be connected to the groove 1011. Figure 5 As shown, in the present application, the through slot 1022 can also be obtained through a single process with the corresponding groove 1011 , which can effectively improve the processing efficiency of the magnetic core 1 , thereby improving the processing efficiency of the magnetic device.

[0063] In order to reduce the leakage of air entering the magnetic device at the through slot 1022 of the bottom wall 102, a wind shield structure may be provided at the notch of the through slot 1022. Fig.10 , the magnetic device may further include a support frame 3. In addition, referring to Fig.12 , Fig.12 A structural schematic diagram of a support frame 3 provided in an embodiment of the present application. The support frame 3 includes a windshield plate 301, and the plate surface of the windshield plate 301 can be a curved surface.

[0064] In addition, refer to Fig.13 , Fig.13A schematic diagram of the structure of the magnetic device provided in the embodiment of the present application from another angle. Fig.13 The coil is omitted. Fig.14 , Fig.14 for Fig.13 EE cross-sectional view of the magnetic device shown in FIG. The windshield 301 can be buckled in the notch of the through slot 1022 to form a hollow channel along the axial direction of the center column 101 between the windshield 301 and the through slot 1022. In this way, the air entering the magnetic device along the axial direction of the center column 101 can flow in the hollow channel, thereby increasing the air volume flowing through each magnetic core 1 of the magnetic device, which is beneficial to improving the heat dissipation efficiency of the magnetic device.

[0065] In addition, in the magnetic device provided in the embodiment of the present application, sealant can also be filled between the edge of the wind shield 301 and the magnetic core 1, so as to achieve the connection between the support frame 3 and the magnetic core 1 while improving the sealing of the hollow channel formed between the wind shield 301 and the through groove 1022, thereby further increasing the air volume flowing through each magnetic core 1 of the magnetic device.

[0066] You can continue to refer to Fig.11 and Fig.12 The support frame 3 provided in the embodiment of the present application may further include a sleeve 302 , which may be sleeved on the middle column 101 . In addition, the end of the sleeve 302 may also abut against the bottom wall 102 , thereby enabling the magnetic core 1 to limit the support frame 3 .

[0067] In the embodiment of the present application, the coil 2 can be wound on the sleeve 302, so that the assembly of the coil 2 and the magnetic core 1 can be achieved through the assembly of the support frame 3 and the magnetic core 1, which is conducive to the automated assembly of the coil 2 and the magnetic core 1, which is conducive to improving the degree of automation in the processing of magnetic devices, thereby improving the production efficiency of magnetic devices.

[0068] In the embodiment of the present application, the support frame 3 can be an integrally formed structure, that is, the windshield plate 301 and the sleeve 302 can be formed by the same process, which is conducive to simplifying the structure of the support frame 3 and improving the structural reliability of the support frame 3. In addition, the present application does not limit the material of the support frame 3, and an exemplary material thereof can be a high temperature resistant insulating material such as nylon.

[0069] In the magnetic device described in the above embodiment of the present application, the axes of the middle columns 101 of the plurality of magnetic cores 1 coincide with each other, and the plurality of coils 2 are arranged at intervals along the axial direction of the middle column 101. Fig.15 , Fig.15 Another structural schematic diagram of a magnetic device provided in an embodiment of the present application, in Fig.15In the magnetic device shown, the middle columns 101 of the multiple magnetic cores 1 are arranged side by side, and the axes of the middle columns 101 of the multiple magnetic cores 1 are parallel and do not overlap, and the multiple coils 2 are respectively wound around the corresponding middle columns 101 of the magnetic cores 1, and the multiple coils 2 are arranged in a direction perpendicular to the axis of the middle column 101.

[0070] exist Fig.15 In the magnetic device shown, the multiple magnetic cores 1 can be an integrally formed structure, and the multiple middle columns 101 of the multiple magnetic cores 1 are all located between two oppositely arranged bottom walls 102, which is beneficial to reducing the material used for the magnetic cores 1 to reduce the cost of the magnetic device. It is also beneficial to reduce the volume of the magnetic device and improve the structural reliability of the magnetic device.

[0071] It is understandable that in Fig.15 In the magnetic device shown, each magnetic core 1 may also be provided with a groove 1011 and a through hole 1021, which may be specifically provided with reference to any of the above embodiments, and will not be described in detail here. Fig.15 Other structures of the magnetic device shown can be arranged with reference to the magnetic device provided in any of the above embodiments, and will not be described in detail here.

[0072] The magnetic device provided in the embodiment of the present application can form an axial wind duct along the middle column in the contact area between the middle column of the magnetic core and the coil by setting a groove in the magnetic core that penetrates the middle column and the bottom wall along the axial direction of the middle column, so that the heat dissipation of the magnetic device can be achieved through the circulation of air in the wind duct, which is conducive to improving the heat dissipation efficiency of the magnetic device. In addition, the grooves provided in the magnetic core can also reduce the materials used in the magnetic core, which is conducive to reducing the cost of the magnetic core.

[0073] In addition, the magnetic device provided in the present application may be, in addition to the above-mentioned coupled magnetic structure, also be Fig.16 The single magnetic component shown has one coil 2 wound around the magnetic core 1. The single magnetic component can be specifically configured with reference to the magnetic component provided in any of the above embodiments, and will not be described in detail here.

[0074] The magnetic device provided in the above embodiment of the present application can be used for various power devices. In practical applications, the power device may further include a housing, and the magnetic device may be accommodated in the housing. The magnetic device may be used to realize the power conversion function of the power device. Since the magnetic device provided in the embodiment of the present application has a high heat dissipation efficiency, the power device using the magnetic device has better performance.

[0075] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A magnetic device, characterized in that: Comprising a magnetic core, wherein: The magnetic core includes a middle column and a bottom wall, wherein the middle column is arranged on one side of the bottom wall, and one end of the middle column is connected to the bottom wall; the middle column includes a groove, wherein the groove is recessed along the peripheral side of the middle column in the direction of the axis of the middle column, and the groove penetrates the middle column along the axial direction of the middle column; The bottom wall comprises a through hole, the through hole penetrates the bottom wall along the axial direction of the center column, and the through hole is communicated with the groove.

2. The magnetic device according to claim 1, characterized in that The center column is provided with a plurality of the grooves, and the plurality of the grooves are arranged at intervals along the circumference of the center column.

3. The magnetic device according to claim 2, characterized in that The bottom wall includes one or more through holes, and a portion of a projection of each through hole in a plane perpendicular to the axis of the center column coincides with a projection of one of the grooves in a plane perpendicular to the axis of the center column.

4. The magnetic device according to claim 3, characterized in that The hole wall of the through hole includes an arcuate surface and two planes, the projection of the arcuate surface in the plane perpendicular to the axis of the center column coincides with the projection of one of the grooves in the plane perpendicular to the axis of the center column; the two planes are respectively connected to an edge of the arcuate surface, and the angle between the two planes toward the arcuate surface is an acute angle.

5. The magnetic device according to any one of claims 2 to 4, characterized in that: The magnetic core also includes two side walls, which are located on the same side of the bottom wall as the center column, and are located on opposite sides of the center column along the radial direction of the center column; a plane passing through the axis of the center column and perpendicular to the two side walls passes through at least one of the grooves.

6. The magnetic device according to any one of claims 2 to 5, characterized in that: The bottom wall is provided with a through groove, the through groove is recessed along the edge of the bottom wall toward the axis of the center column, the through groove penetrates the bottom wall along the axial direction of the center column, and the through groove is communicated with the groove.

7. The magnetic device according to claim 6, characterized in that The magnetic device further comprises a support frame, wherein the support frame comprises a windshield plate, wherein the windshield plate is buckled in a notch of the through slot, and the windshield plate and the through slot form a hollow channel.

8. The magnetic device according to claim 6 or 7, characterized in that: The magnetic device further includes a coil, and the support frame further includes a sleeve, the sleeve is sleeved on the middle column, and the coil is wound around the sleeve.

9. The magnetic device according to any one of claims 1 to 8, characterized in that: The magnetic device comprises a plurality of magnetic cores, the plurality of magnetic cores are connected in sequence, and the axes of the middle columns of the plurality of magnetic cores coincide.

10. The magnetic device according to any one of claims 1 to 8, characterized in that: The magnetic device includes a plurality of magnetic cores, and the middle columns of the plurality of magnetic cores are arranged side by side.

11. The magnetic device according to claim 9 or 10, characterized in that: The magnetic device includes a plurality of coils, each of which is wound around the middle column of the corresponding magnetic core.

12. A power device, characterized in that: The invention comprises a shell and a magnetic device according to any one of claims 1 to 11, wherein the magnetic device is accommodated in the shell.

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