Magnetic element

Abstract

The utility model provides a magnetic element. The magnetic element comprises a shell, a magnetic unit and heat-conducting glue, wherein the shell is provided with an accommodating space; the magnetic unit is arranged in the containing space and comprises a winding frame, two magnetic cores and a coil, the winding frame comprises a hollow sleeve and at least two blades arranged at the two ends of the hollow sleeve, and a groove is formed in the side edge of each blade; each magnetic core comprises a bottom plate and a middle column arranged on the bottom plate, and the middle column of each magnetic core is contained in the hollow sleeve of the reel; the coil is wound on the outer surface of the hollow sleeve and is positioned between the at least two blades; the heat-conducting glue is filled in the accommodating space and wraps the magnetic unit. Therefore, all gaps in the shell can be filled with the heat-conducting glue in the vacuum infusion process, and the heat dissipation degree of the magnetic element is improved.

Description

Technical Field

[0001] The present application relates to a magnetic element, and in particular to a magnetic element capable of improving heat dissipation. Background Art

[0002] Magnetic components, such as transformers or inductors, are widely used in power supplies. As the volume power density of power supplies increases, the temperature of magnetic components rises due to high power output. Therefore, in order to improve the efficiency of heat dissipation, the space inside the magnetic components is filled with thermal conductive glue to conduct the heat inside the magnetic components to the surface, and then the heat is taken away by a thermal conductive cold plate or fan.

[0003] However, after the magnetic element is filled with the thermal conductive adhesive, if there is air inside the magnetic element that cannot be discharged, there is a problem of reducing the thermal conductivity effect.

[0004] Therefore, how to provide a magnetic element whose structural design can easily allow the original air in the magnetic element to be easily discharged during the process of pouring thermal conductive adhesive is a direction that technicians in this field are eager to develop. Utility Model Content

[0005] The embodiment of the present application provides a magnetic element, the structural design of which makes it easy for the original air in the magnetic element to be discharged during the process of injecting thermal conductive adhesive, thereby effectively improving the thermal conductivity effect and the heat dissipation degree of the magnetic element.

[0006] The present application provides a magnetic element, which includes: a shell, a magnetic unit and a thermal conductive adhesive. The shell is provided with a containing space; the magnetic unit is arranged in the containing space and includes a winding frame, two magnetic cores and a coil, the winding frame includes a hollow sleeve and at least two blades arranged at both ends of the hollow sleeve, and each blade has a groove on the side; each magnetic core includes a bottom plate and a middle column arranged on the bottom plate, and the middle column of each magnetic core is respectively accommodated in the hollow sleeve of the winding frame; the coil is wound on the outer surface of the hollow sleeve and is located between at least two blades arranged at both ends of the hollow sleeve; the thermal conductive adhesive is filled in the containing space and covers the magnetic unit.

[0007] In the embodiment of the present application, grooves are provided on the sides of the blades and the center column of the magnetic core is accommodated in a hollow sleeve, thereby increasing the channel for the flow of the thermal conductive adhesive, allowing the thermal conductive adhesive to flow smoothly in the shell, which is conducive to the thermal conductive adhesive filling all the gaps in the shell, ensuring that the magnetic element can expel the original air in the magnetic element during the vacuum infusion process of the thermal conductive adhesive, effectively improving the thermal conductivity, thereby improving the heat dissipation of the magnetic element. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0009] Figure 1 is a three-dimensional diagram of a first embodiment of a magnetic element according to the present application;

[0010] Figure 2 for Figure 1 Partial exploded view of magnetic components;

[0011] Figure 3 for Figure 1 A cross-sectional view of a magnetic element along line segment AA';

[0012] Figure 4 for Figure 1 A cross-sectional view of a magnetic element along line segment BB';

[0013] Figure 5 for Figure 2 A three-dimensional diagram of a winding frame;

[0014] Figure 6 for Figure 2 A three-dimensional diagram of a magnetic core;

[0015] Figure 7 for Figure 2 A top view of the magnetic core;

[0016] Figure 8 for Figure 2 A side view of a magnetic unit;

[0017] Fig. 9 is a three-dimensional diagram of a second embodiment of a magnetic element according to the present application; and

[0018] Fig.10 for Fig. 9 Partial exploded view of the magnetic components. DETAILED DESCRIPTION

[0019] The following will be used in conjunction with the accompanying drawings to illustrate the embodiments of the present utility model. In these drawings, the same reference numerals represent the same or similar components or method flows.

[0020] It must be understood that the words "comprises", "including", etc. used in this specification are used to indicate the existence of specific technical features, values, method steps, job processing, components and / or assemblies, but do not exclude the addition of more technical features, values, method steps, job processing, components, assemblies, or any combination of the above.

[0021] In addition, when a component is described as being "connected" or "coupled" to another component, it may be directly connected or coupled to the other component, and intermediate components may be present. Conversely, when a component is described as being "directly connected" or "directly coupled" to another component, there are no intermediate components.

[0022] See also Figures 1 to 4 , Figure 1 is a three-dimensional diagram of a first embodiment of a magnetic element according to the present application, Figure 2 for Figure 1 Partial exploded view of magnetic components, Figure 3 for Figure 1 The cross-sectional view of the magnetic element along the line segment AA', Figure 4 for Figure 1 The cross-sectional view of the magnetic element along line segment BB'. Figures 1 to 4 As shown, in this embodiment, the magnetic element 100 includes: a housing 110, a magnetic unit 120 and a thermal conductive adhesive 130. The number of the magnetic unit 120 can be but is not limited to one; the magnetic element 100 can be but is not limited to an inductor, but this embodiment is not intended to limit this application. For example, the magnetic element 100 can also be a transformer.

[0023] In this embodiment, the housing 110 is provided with a receiving space 112. The housing 110 may be made of a metal material or an alloy material, so that it has good heat conduction properties. Specifically, the housing 110 may be made of one or more combinations of gold, aluminum, copper, platinum, titanium, and chromium; however, this embodiment is not intended to limit the present application. For example, the housing 110 may also be made of a plastic with heat conductivity.

[0024] In this embodiment, the magnetic unit 120 is disposed in the accommodation space 112 and includes a winding frame 122, two magnetic cores 124 and a coil 126, wherein the number of the coil 126 may be but is not limited to one. For example, when the magnetic element 100 is a transformer, the number of the coil 126 may include at least two.

[0025] See also Figure 5 , which is Figure 2 The winding frame 122 includes a hollow sleeve 1222 and at least two blades 1224 disposed at both ends of the hollow sleeve 1222, and a groove 1226 is disposed on the side of each blade 1224. The number of blades 1224 may be but not limited to four (two blades 1224 are disposed at each end of the hollow sleeve 1222), and the structural design of each blade 1224 may be the same, and the two blades 1224 disposed at the same end of the hollow sleeve 1222 may be mirror images; the material of the winding frame 122 may be a non-magnetic material, such as but not limited to plastic, but this embodiment is not intended to limit the present application.

[0026] See also Figure 6 and Figure 7 , Figure 6 for Figure 2 A three-dimensional diagram of the magnetic core, Figure 7 for Figure 2 A top view of the magnetic core 124. Each magnetic core 124 includes a bottom plate 1242 and a center column 1244 disposed on the bottom plate 1242. The center column 1244 of each magnetic core 124 is respectively accommodated in the hollow sleeve 1222 of the winding frame 122 (i.e., the winding frame 122 is sandwiched between the two magnetic cores 124). The two magnetic cores 124 are arranged opposite to each other; the center column 1244 is perpendicular to the bottom plate 1242, and the center column 1244 is disposed at the geometric center of the bottom plate 1242. The structural design of each magnetic core 124 can be the same; the material of the magnetic core 124 can be an iron powder core with low magnetic permeability, such as: iron-silicon alloy and iron-nickel alloy, or a ferrite with higher magnetic permeability, such as: manganese-zinc or nickel-zinc, but this embodiment is not used to limit the present application.

[0027] See also Figure 2 The coil 126 is wound around the outer surface 1228 of the hollow sleeve 1222 and is located between at least two blades 1224 disposed at both ends of the hollow sleeve 1222. The coil 126 may be an enameled coil formed by winding an enameled wire; the coil 126 may be a round coil or a flat coil; the number of layers of the coil 126 wound around the outer surface 1228 of the hollow sleeve 1222 may be but is not limited to two layers, but this embodiment is not intended to limit the present application.

[0028] See also Figure 3 and Figure 4 The thermal conductive adhesive 130 is filled in the accommodation space 112 and covers the magnetic unit 120. The thermal conductive adhesive 130 may be made of an inorganic material with good thermal conductivity, such as epoxy, silicone, or polyurethane (PU), and the thermal conductivity may be, but is not limited to, greater than 0.3 W / mk.

[0029] A groove 1226 is provided on the side of the blade 1224, and the middle column 1244 of the magnetic core 124 is accommodated in the hollow sleeve 1222, so that the channel for the thermal conductive adhesive 130 to flow is increased, allowing the thermal conductive adhesive 130 to flow smoothly in the shell 110, which is conducive to the thermal conductive adhesive 130 filling all the gaps in the shell 110, ensuring that the original air in the magnetic element 100 can be discharged during the vacuum infusion process of the thermal conductive adhesive 130, effectively improving the thermal conductivity effect, thereby improving the heat dissipation of the magnetic element 100.

[0030] In one embodiment, each magnetic core 124 may be provided with a through hole 1246 penetrating the bottom plate 1242 and the middle column 1244 to increase the flow channel of the thermal conductive adhesive 130 , thereby facilitating the thermal conductive adhesive 130 to fill all gaps in the housing 110 , thereby effectively improving the thermal conductivity effect.

[0031] In one embodiment, the blades 1224 may be disposed perpendicularly to the outer surface 1228 of the hollow sleeve 1222. In addition, the blades 1224 and the bottom plate 1242 of the magnetic core 124 may be disposed parallel to each other.

[0032] In one embodiment, the groove 1226 of the blade 1224 may be disposed correspondingly to the bottom plate 1242 of the adjacent magnetic core 124. Figure 2 and Figure 8 As shown, Figure 8 for Figure 2 Specifically, the two blades 1224 disposed at the same end of the hollow sleeve 1222 correspond to the opposite sides of the middle column 1244 of the adjacent magnetic core 124, so that the groove 1226 of the blade 1224 can be disposed correspondingly to the bottom plate 1242 of the adjacent magnetic core 124.

[0033] In one embodiment, each magnetic core 124 may further include a side column 1248 disposed on the bottom plate 1242 and located on one side of the middle column 1244. The bottom plate 1242 may have an opening 50 disposed between the middle column 1244 and the side column 1248. Figure 6 and Figure 8 The magnetic core 124 may include two side pillars 1248 located on opposite sides of the middle pillar 1244, the two side pillars 1248 are perpendicular to the bottom plate 1242, the bottom plate 1242 may be provided with an opening 50 on opposite sides of the middle pillar 1244, respectively, and the two openings 50 may be located between the middle pillar 1244 and the adjacent side pillars 1248. Therefore, the flow channel of the thermal conductive adhesive 130 can be increased, which is conducive to the thermal conductive adhesive 130 filling all the gaps in the housing 110 during the vacuum infusion process.

[0034] In one embodiment, the groove 1226 of the blade 1224 is disposed corresponding to the adjacent opening 50. Figure 8 It can be seen that after the magnetic unit 120 is assembled, the groove 1226 of the blade 1224 can be exposed from the opening 50 of the adjacent magnetic core 124. Therefore, the flow channel of the thermal conductive adhesive 130 can be increased, which is conducive to the thermal conductive adhesive 130 filling all gaps in the housing 110 during the vacuum infusion process.

[0035] See also Figure 2 , Figure 3 , Figure 5 and Figure 8The winding frame 122 may further include at least one convex strip 60 disposed on the outer surface 1228 of the hollow sleeve 1222, and the coil 126 is wound around the outer surface 1228 and contacts the at least one convex strip 60, so that a gap 70 is formed between the coil 126 and the outer surface 1228. Therefore, the flow channel of the thermal conductive adhesive 130 can be increased, which is conducive to the thermal conductive adhesive 130 filling all the gaps in the housing 110 during the vacuum infusion process. In this embodiment, the number of the convex strips 60 may be but is not limited to eight, and the extension direction of the convex strips 60 is the same as the extension direction of the hollow sleeve 1222, but this embodiment is not intended to limit the present application.

[0036] In one embodiment, the convex strip 60 may be disposed corresponding to the concave groove 1226 of the blade 1224, such as Figure 5 and Figure 8 In addition, Figure 5 and Figure 8 In the embodiment, the convex strips 60 on the left and right sides of the outer surface 1228 of the hollow sleeve 1222 can be exposed at the bottom of the corresponding groove 1226 .

[0037] In one embodiment, the outer surface 1228 of the hollow sleeve 1222 is provided with an opening 80, and the opening 80 is communicated with the hollow channel 90 of the hollow sleeve 1222. Figure 5 As shown. Therefore, the flow channel of the thermal conductive adhesive 130 can be increased, which is conducive to the thermal conductive adhesive 130 filling all the gaps in the housing 110 during the vacuum infusion process. In this embodiment, the number of the openings 80 can be but is not limited to two, but this embodiment is not intended to limit the present application.

[0038] In one embodiment, a glue pouring groove 116 connected to the accommodating space 112 is provided on the outer side wall 114 of the housing 110. The glue pouring groove 116 may be provided at a corner of the housing 110; the number of the glue pouring grooves 116 may be but is not limited to two; in the vacuum pouring process of the thermal conductive glue 130, the glue pouring device may be inserted from the glue pouring groove 116 into the housing 110, so that the thermal conductive glue 130 may flow into the connected accommodating space 112 along the inner groove wall of the glue pouring groove 116, thereby avoiding the accumulation of bottom air in the accommodating space 112 and improving the heat dissipation of the magnetic element 100; the more glue pouring grooves 116 there are, the more the vacuum pouring process of the thermal conductive glue 130 may be performed simultaneously through multiple glue pouring devices, thereby shortening the time spent on the glue pouring process. In one example, the glue pouring groove 116 may be a notched groove. In another example, the glue pouring groove 116 may be an oblique opening.

[0039] In one embodiment, the housing 110 may include a base 117 and a cover plate 118, a notch 40 is recessed on the side of the cover plate 118, the cover plate 118 is covered on the base 117, a glue injection port 30 is formed between the notch 40 of the cover plate 118 and the side wall 119 of the base 117, and the glue injection port 30 is communicated with the accommodating space 112. In the vacuum injection process of the thermal conductive glue 130, the glue injection device can be inserted into the housing 110 from the glue injection port 30, so that the thermal conductive glue 130 can flow into the accommodating space 112 along the inner wall surface of the side wall 119 of the base 117, so as to avoid the accumulation of air at the bottom of the accommodating space 112 and improve the heat dissipation of the magnetic element 100; the cover plate 118 can be engaged with the side wall 119 of the base 117.

[0040] In one embodiment, the magnetic element 100 may further include an insulating tape 140, and the insulating tape 140 covers a portion of the coil 126, so that the coil 126 is fixed on the winding frame 122. Figure 2 and Figure 4 The number of layers of the coil 126 wound on the outer surface 1228 of the hollow sleeve 1222 is two, so the insulating tape 140 can not only cover the last circle of the coil 126 wound on the winding frame 122, but also cover the first circle located in the same layer as the last circle, so that the coil 126 is fixed on the winding frame 122. Since the insulating tape 140 does not completely cover the coil 126, the thermal conductive adhesive 130 can enter the gap of the coil 126 during the vacuum infusion process of the thermal conductive adhesive 130, which is conducive to the thermal conductive adhesive 130 to export the heat generated by the coil 126, thereby improving the heat dissipation degree of the magnetic element 100.

[0041] In one embodiment, the width of the insulating tape 140 may be greater than the wire diameter of the coil 126 and less than 1.5 times the wire diameter of the coil 126. Figure 4 shown.

[0042] In one embodiment, two ends of the coil 126 may pass through the cover plate 118 of the housing 110 .

[0043] See also Fig. 9 and Fig.10 , Fig. 9 is a three-dimensional diagram of a second embodiment of a magnetic element according to the present application. Fig.10 for Fig. 9Partial exploded view of the magnetic element. The magnetic element 200 includes a shell 210, two magnetic units 120 and thermally conductive adhesive (not drawn), wherein the shell 210 is provided with a receiving space 212. In addition, the shell 210 is also provided with N partitions 211, and the N partitions 211 divide the receiving space 212 into N+1 receiving grooves 213. The number of magnetic units 120 is N+1, and the N+1 magnetic units 120 are arranged one-to-one in the N+1 receiving grooves 213, and N is a positive integer; in this embodiment, N=1, that is, the shell 210 is provided with a partition 211, and the partition 211 divides the receiving space 212 into two receiving grooves 213; the two magnetic units 120 are arranged one-to-one in the two receiving grooves 213; the thermally conductive adhesive is filled in the two receiving grooves 213 and covers the two magnetic units 120, but this embodiment is not used to limit the present application.

[0044] In one embodiment, the housing 210 may include a base 217 and two cover plates 218, each cover plate 218 is covered on the base 217 to form a glue injection port 30, and the glue injection port 30 is communicated with the corresponding receiving groove 213. The glue injection device can be inserted into the housing 210 from the glue injection port 30, so that the thermal conductive glue can flow into the receiving groove 213 along the inner wall surface of the side wall 219 of the base 217, thereby avoiding the accumulation of air at the bottom of the receiving groove 213 and improving the heat dissipation of the magnetic element 200.

[0045] In one embodiment, the base 217 may be provided with two glue pouring grooves 216 respectively connected with the two receiving grooves 213. The glue pouring groove 216 may be provided at the corner of the housing 210; the glue pouring device may be inserted from the glue pouring groove 216 into the housing 210, so that the thermal conductive glue may flow into the connected receiving grooves 213 along the inner groove wall of the glue pouring groove 216, thereby avoiding air accumulation at the bottom layer of the receiving groove 213 and improving the heat dissipation of the magnetic element 200.

[0046] In summary, in the embodiment of the present application, the side of the blade is provided with a groove, and the middle column of the magnetic core is accommodated in the hollow sleeve, so that the channel for the flow of the thermal conductive glue is increased, so that the thermal conductive glue can flow smoothly in the shell, which is conducive to the thermal conductive glue filling all the gaps in the shell, ensuring that the magnetic element can discharge the original air in the magnetic element during the vacuum infusion process of the thermal conductive glue, effectively improving the heat conduction effect, thereby improving the heat dissipation of the magnetic element. In addition, the magnetic core is provided with a through hole that passes through the bottom plate and the middle column, the bottom plate is provided with an opening between the middle column and the side column, the groove of the blade is arranged corresponding to the adjacent opening, and the outer surface of the hollow sleeve of the winding frame is provided with a convex strip and / or the outer surface of the hollow sleeve is provided with an opening, so as to further increase the channel for the flow of the thermal conductive glue, which is more conducive to the thermal conductive glue filling all the gaps in the shell during the vacuum infusion process. In addition, by setting the glue injection groove and / or the glue injection port, the thermal conductive glue flows into the connected accommodation space or accommodation groove along the inner wall surface of the shell, avoiding the accumulation of air at the bottom of the accommodation space or accommodation groove, thereby improving the heat dissipation of the magnetic element. Furthermore, by wrapping part of the coil with insulating tape, the thermal conductive glue can enter the gap of the coil during the vacuum injection process of the thermal conductive glue, which is conducive to the thermal conductive glue to remove the heat generated by the coil, thereby improving the heat dissipation of the magnetic element.

[0047] Although the present invention is described using the above embodiments, it should be noted that these descriptions are not configured to limit the present invention. On the contrary, the present invention covers obvious modifications and similar arrangements that are obvious to those skilled in the art. Therefore, the scope of the claims should be interpreted in the broadest way to include all obvious modifications and similar arrangements.

Claims

1. A magnetic element, characterized in that: include: A housing is provided with a containing space; A magnetic unit is disposed in the accommodating space, and the magnetic unit includes: The winding frame comprises a hollow sleeve and at least two blades arranged at two ends of the hollow sleeve, and a groove is concavely provided on the side of each of the at least two blades; Two magnetic cores, each of the two magnetic cores comprises a bottom plate and a middle column arranged on the bottom plate, and the middle column of each of the two magnetic cores is respectively accommodated in the hollow sleeve of the winding frame; as well as a coil, wound around the outer surface of the hollow sleeve and located between the at least two blades; and The heat-conducting adhesive is filled in the accommodating space and covers the magnetic unit.

2. The magnetic element according to claim 1, characterized in that Each of the two magnetic cores is provided with a through hole penetrating the bottom plate and the middle column.

3. The magnetic element according to claim 1, characterized in that The at least two blades are vertically arranged on the outer surface of the hollow sleeve.

4. The magnetic element according to claim 1, characterized in that The grooves of the at least two blades are respectively arranged corresponding to the bottom plates of adjacent magnetic cores.

5. The magnetic element according to claim 1, characterized in that Each of the at least two magnetic cores further includes a side column arranged on the bottom plate and located on one side of the middle column. The bottom plate is provided with an opening, and the opening is located between the middle column and the side column.

6. The magnetic element according to claim 5, characterized in that The winding frame also includes at least one convex strip arranged on the outer surface of the hollow sleeve, and the coil is wound around the outer surface and contacts the at least one convex strip, so that a gap is formed between the coil and the outer surface.

7. The magnetic element according to claim 6, characterized in that The at least one convex strip is arranged corresponding to the concave groove.

8. The magnetic element according to claim 5 or 7, characterized in that: The grooves are arranged correspondingly to the adjacent openings.

9. The magnetic element according to claim 1, characterized in that: The outer surface of the hollow sleeve is provided with an opening, and the opening is communicated with the hollow channel of the hollow sleeve.

10. The magnetic element according to claim 1, characterized in that A glue pouring groove communicated with the accommodating space is arranged on the outer side wall of the shell.

11. The magnetic element according to claim 1, characterized in that: The shell includes a base and a cover plate, a side edge of the cover plate is concavely provided with a notch, the cover plate is covered on the base, a glue injection port is formed between the notch of the cover plate and the side wall of the base, and the glue injection port is communicated with the accommodating space.

12. The magnetic element according to claim 1, characterized in that It also includes an insulating tape, which covers a portion of the coil so that the coil is fixed on the winding frame.

13. The magnetic element according to claim 12, characterized in that: The insulating tape covers the last turn of the coil wound on the winding frame.

14. The magnetic element according to claim 12 or 13, characterized in that: The width of the insulating tape is greater than the wire diameter of the coil and less than 1.5 times the wire diameter of the coil.

15. The magnetic element according to claim 1, characterized in that The shell is also provided with N partitions, and the N partitions divide the accommodating space into N+1 accommodating grooves. The number of the magnetic units is N+1, and the N+1 magnetic units are arranged one-to-one in the N+1 accommodating grooves, and N is a positive integer.

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