CN221040792U - Coating film, inductance assembly and integrated inductor - Google Patents
Coating film, inductance assembly and integrated inductor Download PDFInfo
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- CN221040792U CN221040792U CN202322612905.1U CN202322612905U CN221040792U CN 221040792 U CN221040792 U CN 221040792U CN 202322612905 U CN202322612905 U CN 202322612905U CN 221040792 U CN221040792 U CN 221040792U
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- coating film
- coil
- injection molding
- magnetic core
- molding shell
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- 239000011248 coating agent Substances 0.000 title claims abstract description 51
- 238000000576 coating method Methods 0.000 title claims abstract description 51
- 238000001746 injection moulding Methods 0.000 claims abstract description 43
- 238000011049 filling Methods 0.000 claims abstract description 14
- 239000011810 insulating material Substances 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 229920006305 unsaturated polyester Polymers 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 239000010408 film Substances 0.000 description 43
- 230000017525 heat dissipation Effects 0.000 description 8
- 239000000945 filler Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004641 Diallyl-phthalate Substances 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- QUDWYFHPNIMBFC-UHFFFAOYSA-N bis(prop-2-enyl) benzene-1,2-dicarboxylate Chemical compound C=CCOC(=O)C1=CC=CC=C1C(=O)OCC=C QUDWYFHPNIMBFC-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013039 cover film Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
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- Coils Or Transformers For Communication (AREA)
Abstract
The utility model discloses a coating film, an inductance component and an integrally formed inductance, wherein the coating film is tightly filled between a magnetic core and a coil, the coating film is of a grid film structure made of insulating materials, and a plurality of evenly distributed through holes are formed in the coating film; the inductance component comprises a magnetic core, a coil and the coating film, wherein the magnetic core is nested in the coil, and the coating film is tightly arranged between the magnetic core and the coil; the integrated inductor comprises an injection molding shell, a terminal and the inductor assembly, wherein the injection molding shell is tightly wrapped outside the inductor assembly, a filling part inside the injection molding shell is tightly filled between the magnetic core and the coil, and the terminal is arranged on the surface of the injection molding shell; according to the utility model, the injection molding shell wrapping the inductor assembly is formed in an injection molding mode, and the filling part densely filled between the magnetic core and the coil is formed in the injection molding shell, so that the gap between the magnetic core and the coil is eliminated, and the inductor size is reduced.
Description
Technical Field
The utility model relates to the field of electronic elements, in particular to a coating film, an inductance component and an integrally formed inductance.
Background
With the development of modern industry, electronic products are widely applied in various fields and places, and magnetic components such as inductors, transformers and the like play roles in circuits such as voltage boosting and reducing, energy storage, filtering and the like, and are indispensable in the circuits. Nowadays, with the miniaturization and integration development of electronic products, the smaller the volume of each electronic component is, the more advantageous. Current low current, low power electronic components have tended to mature using packaging integral molding processes, such as inductance integral molding techniques of core-clad coils. However, due to the limitations of the prior art and the process, the large-scale electronic component products are difficult to integrate.
Disclosure of utility model
The utility model aims to provide a coating film, an inductance component and an integrally formed inductance so as to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
The utility model provides a coating film, which is tightly filled between a magnetic core and a coil, wherein the coating film is of a grid film structure made of an insulating material, and a plurality of uniformly distributed through holes are formed in the coating film.
As a further scheme of the utility model: the coating film is one of a polydiallyl phthalate, an epoxy resin film or an unsaturated polyester.
As a further scheme of the utility model: the through holes are in one of triangle, circle, ellipse, rectangle or polygon.
As a further scheme of the utility model: and a plurality of mutually parallel hard reinforcing ribs are arranged on the coating film.
As a further scheme of the utility model: the coating film is a netlike film structure which is formed by interweaving the first ribs and the second ribs and is provided with a plurality of through holes.
On the other hand, the utility model also provides an inductance component which comprises a magnetic core, a coil and the coating film, wherein the magnetic core is nested in the coil, and the coating film is tightly arranged between the magnetic core and the coil.
As a further scheme of the utility model: the coil is provided with a hollowed-out part, and the hollowed-out part is formed by winding a wire.
In a third aspect, the utility model further provides an integrally formed inductor, which comprises an injection molding shell, a terminal and the inductor assembly, wherein the injection molding shell is tightly wrapped outside the inductor assembly, a filling part inside the injection molding shell is tightly filled between the magnetic core and the coil, and the terminal is arranged on the surface of the injection molding shell.
As a further scheme of the utility model: and the injection molding shell is provided with radiating holes for exposing part of the coils.
As a further scheme of the utility model: the surface of the injection molding shell forms a terminal groove, the terminal is fixed in the terminal groove, and the end face of the terminal exceeds the end face of the injection molding shell.
Compared with the prior art, the utility model has the beneficial effects that:
The utility model discloses a coating film, inductance assembly and integrated into one piece's inductance is through setting up the coating film of being made by thermosetting insulating material between inductance assembly's magnetic core and coil, thereby make and form reasonable interval between magnetic core and the coil, and form the encapsulation shell of packing outside inductance assembly through injection molding's mode, form closely knit packing portion between magnetic core and coil in the encapsulation shell, thereby eliminate the clearance between magnetic core and the coil, reduce the inductance size, realize integration and integration, avoid short circuit between magnetic core and the coil, improve the security, simultaneously, the heat that the magnetic core produced can be dissipated to the outside of moulding plastics shell through the conduction of packing portion, improve the radiating effect of magnetic core.
Drawings
FIG. 1 is a schematic diagram of a coating film according to an embodiment;
FIG. 2 is a schematic diagram of a middle inductor according to an embodiment;
FIG. 3 is a schematic diagram of a structure of a middle-integrated inductor according to an embodiment;
FIG. 4 is an exploded view of a prior art inductor;
FIG. 5 is a schematic cross-sectional view of a prior art magnetic core and coil;
In the figure: the magnetic core 1, 21, the coil 2, 22, the hollowed-out portion 22a, the terminals 3, 23, the case 4, the case frame 5, the coating film 10, the first rib 11, the second rib 12, the reinforcing rib 13, the through hole 14, the inductance element 20, the first terminal 231, the second terminal 232, the injection molded case 24, the heat dissipation hole 241, and the terminal groove 242.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 4, the conventional inductance component mainly includes a magnetic core 1, a coil 2 wound around the magnetic core 1, a terminal 3 connected to an end of the coil 2, and a housing 4 for sealing the magnetic core 1 and the coil 2 together, wherein the housing 4 is mainly made of an insulating material and forms a hollow housing 4 structure matching with the installation and positioning of the magnetic core 1 and the coil 2, the housing 4 integrally seals the magnetic core 1 and the coil 2 together to ensure the sealing and insulation of the inductance, and the terminal 3 is disposed on an outer surface of the housing 4 to be connected with an external circuit board or other circuit devices. Therefore, the current product is formed by assembling a plurality of parts, in order to ensure assembly, manufacturability and assemblability of each part need to be fully considered when designing the product structure, in order to avoid poor assembly, a large gap needs to be designed in each part in the process of designing the product, for example, as shown in fig. 5, a shell skeleton 5 for separating the magnetic core 1 and the coil 2 is arranged inside the shell 4, and the shell skeleton 5 is used for being inserted between the magnetic core 1 and the coil 2 for positioning and insulation during assembly, so that a large gap exists among the magnetic core 1, the coil 2 and the shell skeleton 5, and the existence of the gap influences the size of the inductance product on one hand, and dust accumulation and ash accumulation can exist under the condition of loose assembly, so that the service life is influenced.
In order to solve the above-mentioned problems, fig. 1 shows a coating film 10, wherein the coating film 10 is filled between a magnetic core 21 and a coil 22 to isolate the magnetic core 21 from the coil 22, and simultaneously can play a role of compressing and positioning between the two, thereby reducing a gap between the two to prevent a short circuit caused by high voltage breakdown of the magnetic core 21 and the coil 22.
In one embodiment, the coating film 10 is a mesh film structure formed by interweaving the first ribs 11 and the second ribs 12, and the plurality of through holes 14 are uniformly distributed on the coating film 10. In the coating film 10 shown in fig. 1, the shape of the through holes 14 is diamond, and in other embodiments, the through holes 14 may be one of triangle, circle, ellipse, rectangle, or polygon.
In one embodiment, the cover film 10 is made of a thermoset insulating material that is relatively resistant to high temperatures, low in hardness, and has some ability to elastically deform, such as using diallyl phthalate, epoxy, and unsaturated polyesters, which deform independently of temperature. When in assembly, the coating film 10 is coated on the periphery of the magnetic core 21, a certain tension is maintained by the elastic deformation capability and the holding of the grid structure, the formed coil 22 is sleeved into the magnetic core 21, the coating film 10 is clamped between the coil 22 and the magnetic core 21 without scattering, and the magnetic core 21 and the coil 22 generate outward extrusion tension under the action of elasticity, so that the position fixing between the magnetic core 21 and the coil 22 is realized, and the mode of isolating through the shell framework 5 formed on the shell 4 in the prior art is eliminated. Meanwhile, under the working condition, the heat generated by the magnetic core 21 and the wires does not influence the coating film 10.
In some embodiments, a plurality of mutually parallel hard reinforcing ribs 13 are arranged on the coating film 10 at intervals. The reinforcing ribs 13 extend entirely in the width direction of the wrapping film 10, but both ends thereof are located inside the widthwise edges of the wrapping film 10. When the magnetic core 21 is wrapped by the wrapping film 10, the reinforcing ribs 13 are arranged on the inner side, so that the insufficient distance between the copper wires and the magnetic core 21 is prevented, and the separation distance is increased; on the other hand, the structural strength of the coating film 10 is increased, the deformation of the coating film 10 is reduced, and the coating thickness is made uniform.
On the other hand, referring to fig. 2, the present invention provides an inductance assembly, which includes a magnetic core 21, a coil 22, and a coating film 10 according to any one of the above embodiments, wherein the magnetic core 21 is nested inside the coil 22, and the coating film 10 is tightly disposed between the magnetic core 21 and the coil 22. By the arrangement of the coating film 10, a proper interval is kept between the magnetic core 21 and the coil 22, the separation distance is increased, and short circuit is prevented; in addition, the magnetic core 21 and the coil 22 can be pressed and positioned through the elastic tensioning action of the coating film 10, so that the assembly is convenient.
In some embodiments, the coil 22 is provided with a hollowed portion 22a, the hollowed portion 22a may be one or more, and the hollowed portion 22a is a rectangular, circular, square or other through hole structure formed on the periphery of the coil 22, so as to achieve a certain heat dissipation effect. It should be noted that the hollowed-out portion 22a is not formed by cutting the coil, but is the hollowed-out portion 22a formed by winding the wire of the coil, so that the wire on the coil 22 still maintains a complete state.
In a third aspect, referring to fig. 3, the present invention further provides an integrally formed inductor, which includes the inductor assembly, the injection molding shell 24 and the terminal 23 in the above embodiment. The injection molding shell 24 of the integrally formed inductor is tightly wrapped outside the inductor assembly, so that the assembly interval between the magnetic core 21 and the coil 22 can be completely eliminated, the problem that the overall size of the inductor is large due to the clearance left during the assembly of the prefabricated shell 4 in the prior art is avoided, and the inductor size is further reduced.
The injection molding shell 24 is made of insulating materials with good thermal conductivity, including but not limited to PPS or thermal conductive adhesive, and the injection molding shell 24 is tightly wrapped outside the inductance component and integrally formed, and a filling portion (not shown in the figure) filled in a gap between the magnetic core 21 and the coil 22 is formed inside the injection molding shell 24, and the filling portion is tightly filled between the magnetic core 21 and the coil 22 with the wrapping film 10 as a framework, so that the magnetic core 21 and the coil 22 are completely isolated, the gap between the two is completely eliminated, and the short circuit risk is eliminated.
Since the injection molding shell 24 is made of an insulating material with good thermal conductivity, the injection molding shell 24 is provided with the filling part positioned inside, and the filling part is densely filled in the gap between the magnetic core 21 and the coil 22, so that a large heat conducting surface is formed, and a large amount of heat generated by the magnetic core 21 is conducted to the outside of the injection molding shell 24 through the filling part to dissipate heat in the working process of the inductor, so that the heat dissipation effect of the magnetic core 21 is greatly improved.
It should be noted that in one embodiment, the periphery of the coil 22 is formed with a hollowed-out portion 22a, so that the injection molding shell 24 is located at the hollowed-out portion 22a to form a transition portion (not shown in the figure), and the transition portion connects the filling portion located inside the coil 22 and the portion of the housing 4 located outside the coil 22, and on one hand, the transition portion plays a certain role in positioning the inductance element 20 firmly in the injection molding shell 24, and on the other hand, the transition portion can increase the heat conduction path from the filling portion to the external housing 4, so as to accelerate heat dissipation.
In some embodiments, the injection molding shell 24 is further provided with heat dissipation holes 241 exposing a portion of the coils 22, and the heat dissipation holes 241 are in one-to-one correspondence with the coils 22 to increase the heat dissipation effect of the coils 22.
In some embodiments, the outer surface of the injection molded shell 24 is also provided with terminal grooves 242 for the terminals 23 to snap into.
The integrally formed inductor terminal 23 comprises two first terminals 231 and a second terminal 232, wherein the two first terminals 231 are respectively and electrically connected to one ends of the two coils 22, the second terminal 232 is used as a common end and commonly connected to the other ends of the two coils 22, the three terminals are fixed in corresponding terminal grooves 242 on the injection molding shell 24, and the end faces of the terminals 23 exceed the end faces of the injection molding shell 24, so that wiring is facilitated.
The utility model discloses an integrated into one piece's inductance, its preparation method is as follows:
Firstly, wrapping the wrapping film 10 on the periphery of the magnetic core 21, inwards pressing the reinforcing ribs 13 of the wrapping film 10 on the outer surface of the magnetic core 21, then jointly inserting the magnetic core 21 wrapped with the wrapping film 10 into the coil 22, keeping a proper gap between the magnetic core 21 and the coil 22 under the elastic force of the wrapping film 10, connecting the terminals 23 at two ends of the coil 22, and limiting the positions of the terminals 23 according to the design scheme;
Manufacturing a hollow mould or skeleton with a prefabricated shape, positioning the inductor assembly in the hollow mould, positioning the terminal 23 in a corresponding groove close to the inner wall of the hollow mould, after positioning, injecting injection molding filler in a high-temperature fluid state into the mould, filling the inner cavity of the whole hollow mould with the injection molding filler, filling part of the injection molding filler between the magnetic core 21 and the coil 22 and along the through hole 14 of the coating film 10, and cooling to form the filling part; and the other part of injection molding filler enters from the hollowed-out part 22a in the middle of the coil 22 and is filled in a sealing way to form the transition part, the rest of injection molding filler wraps the outside of the inductance component and is cooled to form the outer shell 4, and finally, all injection molding fillers are cooled to form the integral injection molding shell 24, and the heat dissipation holes 241 and the terminal grooves 242 are formed on the surface of the injection molding shell 24.
Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.
Claims (10)
1. A coating film, characterized in that: the coating film is tightly filled between the magnetic core and the coil, the coating film is of a grid film structure made of insulating materials, and a plurality of through holes which are uniformly distributed are formed in the coating film.
2. The coating film of claim 1, wherein: the coating film is one of a polydiallyl phthalate film, an epoxy resin film and an unsaturated polyester film.
3. The coating film of claim 1, wherein: the through hole is in one of a circular shape, an elliptic shape and a polygonal shape.
4. The coating film of claim 1, wherein: and a plurality of mutually parallel hard reinforcing ribs are arranged on the coating film.
5. The coating film of claim 1, wherein: the coating film is a netlike film structure which is formed by interweaving the first ribs and the second ribs and is provided with a plurality of through holes.
6. An inductance assembly, characterized in that: the magnetic core is nested inside the coil, and the coating film is arranged between the magnetic core and the coil in a tensioning mode.
7. The inductance assembly of claim 6, wherein: the coil is provided with a hollowed-out part, and the hollowed-out part is formed by winding a wire.
8. An integrated inductor, characterized in that: including injection molding shell, terminal and the inductance subassembly of claim 6, the tight parcel of injection molding shell is outside the inductance subassembly, the inside filling part of injection molding shell closely pack in between the magnetic core and the coil, the terminal sets up in the surface of injection molding shell.
9. The integrally formed inductor as claimed in claim 8, wherein: and the injection molding shell is provided with radiating holes for exposing part of the coils.
10. The integrally formed inductor as claimed in claim 8, wherein: the surface of the injection molding shell forms a terminal groove, the terminal is fixed in the terminal groove, and the end face of the terminal exceeds the end face of the injection molding shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322612905.1U CN221040792U (en) | 2023-09-25 | 2023-09-25 | Coating film, inductance assembly and integrated inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322612905.1U CN221040792U (en) | 2023-09-25 | 2023-09-25 | Coating film, inductance assembly and integrated inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221040792U true CN221040792U (en) | 2024-05-28 |
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ID=91187796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322612905.1U Active CN221040792U (en) | 2023-09-25 | 2023-09-25 | Coating film, inductance assembly and integrated inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221040792U (en) |
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2023
- 2023-09-25 CN CN202322612905.1U patent/CN221040792U/en active Active
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