Insulation paper framework and magnetic element

Abstract

The utility model discloses an insulation paper skeleton and a magnetic element, and the magnetic element comprises a magnetic core (20) which is fixed on a bottom plate (10); the barrel-shaped insulation paper framework (30) is made of insulation paper in a curling mode and arranged on a magnetic core middle column (21) of the magnetic core in a sleeving mode, and a plurality of through holes (31) are formed in a barrel body of the barrel-shaped insulation paper framework (30); and the coil (40) is wound on the insulation paper framework (30), and a coil pin (41) is led out from the bottom plate (10).

Description

TECHNICAL FIELD

[0001] The utility model relates to magnetic component technical field especially relates to an insulating paper framework and use this kind framework's magnetic component. BACKGROUND

[0002] At present, the magnetic component in the field of charging pile is different from the vehicle-mounted component, the application power section is much higher than 3.3KW / 6.6KW commonly used by vehicle-mounted charger (OBC), and the use power has come to 30KW, 40KW or even 60KW;Meanwhile, due to the cost / space restriction, the charging pile component requires smaller volume compared to the vehicle-mounted component, high power, small volume, which determines that the charging pile component generates more heat, and in contrast, the small volume also reduces the heat dissipation channel of the charging pile component (effective air duct reduces / waterway contact area reduces / cannot be flat), a large amount of heat accumulates, the component temperature cannot be controlled, and the temperature may exceed 145 DEG C or even reach 170 DEG C, and long-time high-temperature operation causes insulation problems such as wire tape aging and paint film aging, which causes great safety hazards. Therefore, it is necessary to improve the design of the existing magnetic component to adapt to the small volume, high power, good heat dissipation and other multidirectional requirements of the charging pile on the magnetic component. SUMMARY

[0003] The main purpose of the utility model is to provide an insulating paper framework and a magnetic component using the insulating paper framework to solve the above problems existing in the prior art magnetic component.

[0004] According to one aspect of the utility model, a magnetic component is provided, which comprises: a magnetic core fixed on a bottom plate;A cylindrical insulating paper framework made of insulating paper curling, which is sleeved on the magnetic core column of the magnetic core, and a plurality of through holes are formed on the cylinder body;Coil, which is wound on the insulating paper framework, and the coil pin is led out from the bottom plate.

[0005] Further, the column surface of the magnetic core column has an axially extending recessed part, and the through hole of the insulating paper framework is located at the recessed part.

[0006] Further, the column surface has two recessed parts symmetrically arranged on the upper and lower sides;The cylinder body of the insulating paper framework symmetrically has two rows of axially arranged through holes, and the two rows of through holes are respectively located at the two recessed parts.

[0007] Further, the magnetic core is provided with notches at both ends, and the bottom of the notches is connected with the recessed part.

[0008] Further, the magnetic core is provided with a through hole, which extends axially along the magnetic core column and penetrates from the first end face of the magnetic core to the second end face of the magnetic core through the magnetic core column, and the first end face and the second end face are two opposite end faces of the magnetic core.

[0009] Further, the coil and the insulating paper framework are assembled, and a heat-conducting gel is filled in the air gap of the coil, and then the magnetic core is assembled.

[0010] Further, the heat-conducting gel is filled in the through hole.

[0011] Further, the magnetic core is fixedly connected to the bottom plate by the fixing gel.

[0012] Further, the bottom plate is provided with a plurality of pads for lifting the magnetic core.

[0013] According to another aspect of the utility model, an insulating paper framework is provided for a magnetic element, the insulating paper framework is made into a cylindrical shape by curling insulating paper so as to be sleeved on a middle column of a magnetic core of the magnetic element, and a plurality of through holes are formed in the cylindrical body.

[0014] The beneficial effects of the technical scheme of the utility model are as follows: compared with the existing plastic framework, the insulating paper framework of the utility model can effectively reduce the occupied space, in terms of the width of the magnetic core cavity, the use of the insulating paper framework can reduce the originally reserved 1.2mm space on one side to only 0.5mm space of at most two layers of insulating paper, which can reduce the size of the magnetic core by about 1.5mm (under the premise of the same wire width), on the other hand, the insulating paper framework has high profiling property and good toughness, and can be attached to the magnetic core without considering the tolerance of the magnetic core, compared with the plastic framework, the influence of the installation gap can be ignored, and due to the through holes, the heat dissipation of the magnetic core is facilitated. Ultimately, the magnetic element of the utility model has smaller occupied space and higher density compared with the existing magnetic element with the same performance. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective structural schematic view of the magnetic element of the embodiment of the utility model.

[0016] Figure 2 is another perspective schematic view of the magnetic element of the embodiment of the utility model.

[0017] Figure 3 is an exploded view of the structure of the magnetic element of the embodiment of the utility model.

[0018] Figure 4 is a schematic view of the insulating paper framework of the embodiment of the utility model.

[0019] Figure 5 is a 3D cross-sectional view of the magnetic core air duct of the embodiment of the utility model.

[0020] Figure 6 is a 3D cross-sectional view of the middle column of the magnetic core of the embodiment of the utility model. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The embodiments provided are for illustrative purposes only and are not intended to be limiting. Furthermore, the spatial directional terms such as "upper," "lower," "left," "right," "top," and "bottom" used in the description of the technical solution of the present invention are for the convenience of describing the relative positional relationships between the product's constituent components. They do not imply that the product only has the orientation shown in the drawings. In actual use, as the product's orientation changes, the spatial descriptions used to describe its orientation should also be interpreted in a similar manner. In addition, terms such as "first" and "second" are only used to distinguish components. It should be understood that these components should not be limited by such terms, and they do not inherently imply that these components have the aforementioned ordinal numbers, nor do they represent the arrangement order of one component with another or the order of manufacturing methods.

[0022] Please refer to Figures 1 to 3 This utility model provides a magnetic element, including a base plate 10, a magnetic core 20, a cylindrical insulating paper frame 30, and a coil 40. The magnetic core 20 is fixed on the base plate 10, the insulating paper frame 30 is sleeved on the magnetic core central column 21 of the magnetic core 20, the coil 40 is wound on the insulating paper frame 30, and the coil lead 41 is led out from the base plate 10.

[0023] The insulating paper frame 30 of this utility model embodiment is as follows: Figure 4 As shown, it is made of rolled insulating paper, and the whole is in the shape of a hollow cylinder, with several through holes 31 on the cylinder. Figure 3 and Figure 6 In a preferred embodiment, the magnetic core column 21 is generally cylindrical. More preferably, its cylindrical surface has two symmetrical recessed portions 24, which extend axially along the column and pass through both ends of the magnetic core column. Correspondingly, the insulating paper frame 30 has two rows of axially arranged through holes 31 symmetrically arranged on its cylindrical body. The position of the two rows of through holes is designed so that when the insulating paper frame 30 is fitted onto the magnetic core column 21, the two rows of through holes are aligned with the two recessed portions. The design of the recessed portions can, on the one hand, avoid the distance between the coil and the magnetic core being too close, better meeting the insulation requirements; on the other hand, it forms an airflow path between the insulating paper frame and the magnetic core column, allowing air to blow directly through the magnetic core column and the coil, enhancing heat dissipation and achieving air-cooled heat dissipation.

[0024] Continue to refer to Figure 3 and Figure 6 In some preferred embodiments, the magnetic core 20 has notches 22 at both ends, and the bottom of the notches connects with the recessed portion 24. More preferably, the notches 22 are arc-shaped to conform to the shape of the coil 40.

[0025] refer to Figure 5 and Figure 6In some preferred embodiments, the magnetic core 20 has a through-hole 23 that extends axially along the core post 21 and passes through the core post from the first end face to the second end face, where the first and second end faces are two opposite end faces of the magnetic core 20. Furthermore, thermally conductive adhesive can be injected into the through-hole 23.

[0026] The manufacturing and assembly process of the magnetic element in this embodiment of the utility model includes:

[0027] The length, width, and perforation position of the insulating paper are determined according to the size of the magnetic core column. The paper is then perforated, rolled, and bonded to form a cylindrical insulating paper skeleton 30.

[0028] The pre-wound coil 40 is assembled with the insulating paper frame 30, and thermally conductive gel is filled at the air vent of the coil 40. This effectively occupies the space that may be caused by the expansion of the magnetic core column after the glue flows in, thus avoiding the magnetic core column from breaking after the glue is poured. At the same time, it increases the thermal conductivity of the magnetic core column and further reduces the product temperature.

[0029] Next, the insulating paper frame with the coil assembled is fitted onto one half of the magnetic core (the magnetic core is made of...). Figure 6 On the central column (which is assembled from two halves as shown), the other half of the magnetic core is then assembled. The mating surfaces of the two halves of the magnetic core are coated with glue and bonded together, thus obtaining the main body of the magnetic element.

[0030] Finally, the main body of the magnetic component is fixed to the base plate. Specifically, the bottom of the magnetic core 20 is bonded to the base plate 10 using adhesive 50, and the coil pin 41 is led out from the corresponding hole on the base plate 10 and fixed with solder at the pin and the hole.

[0031] In addition, in some embodiments, the base plate 10 is provided with several pads 11, which are used to raise the magnetic core. This increases the distance between the magnetic core and the base plate, which is beneficial for pin routing and also helps potting compound to enter, thus enhancing heat dissipation.

[0032] As can be seen, the magnetic element in this embodiment of the present invention can be cooled by air or by liquid (thermal conductive adhesive).

[0033] In summary, the insulating paper skeleton of this invention is smaller in size than traditional plastic skeletons, requiring only 0.25mm in thickness, while the minimum thickness for plastic skeletons is 0.8mm. Furthermore, the insulating paper has good shape retention, avoiding space waste caused by the inherent tolerances of the magnetic core and plastic parts. In addition, the perforations on the insulating paper skeleton significantly increase the area exposed to airflow / the contact area with the potting compound, compared to traditional insulating paper, resulting in better heat dissipation.

[0034] This utility model also has the following features:

[0035] 1) Make full use of the shape characteristics of the magnetic core itself (the air ducts and glue holes formed by the recessed parts) to punch holes in the insulating paper to ensure the insulation requirements are met.

[0036] 2) Based on the product's heat generation characteristics, the opening positions of the insulating paper can be designed in a targeted manner to increase heat dissipation wherever heat is generated.

[0037] 3) In view of the characteristics of high power and small size of charging pile components, this utility model effectively occupies a smaller volume (compared to plastic parts frame) to achieve the purpose of both insulation and increased heat dissipation.

[0038] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and all such modifications, with identical performance or use, should be considered within the protection scope of the present invention.

Claims

1. A magnetic element, characterized in that, include: The magnetic core (20) is fixed on a base plate (10); The cylindrical insulating paper skeleton (30) is made of rolled insulating paper and is fitted onto the magnetic core column (21) of the magnetic core, and several through holes (31) are opened on the cylindrical body. A coil (40) is wound on the insulating paper frame (30), and coil leads (41) are led out from the base plate (10).

2. The magnetic element as described in claim 1, characterized in that: The cylindrical surface of the magnetic core column (21) has an axially extending recessed portion, and the through hole (31) of the insulating paper skeleton (30) is located in the recessed portion.

3. The magnetic element as described in claim 2, characterized in that: The cylindrical surface has two symmetrical recessed parts; the insulating paper skeleton (30) has two rows of axially arranged through holes symmetrically opened on the cylinder, and the two rows of through holes are respectively located at the two recessed parts.

4. The magnetic element as described in claim 2 or 3, characterized in that: The magnetic core (20) has notches (22) at both ends, and the bottom of the notches is connected to the recessed part.

5. The magnetic element as described in claim 1, characterized in that: The magnetic core (20) has a through hole (23) which extends axially along the central column (21) of the magnetic core and passes through the central column to the second end face of the magnetic core. The first end face and the second end face are two opposite end faces of the magnetic core (20).

6. The magnetic element as described in claim 5, characterized in that: After the coil (40) is assembled with the insulating paper skeleton (30), thermally conductive gel is filled into the air gap of the coil (40), and then assembled with the magnetic core (20).

7. The magnetic element as described in claim 6, characterized in that: It also includes thermally conductive adhesive injected through the through-hole (23).

8. The magnetic element as claimed in claim 1, characterized in that: The magnetic core (20) is bonded and fixed to the base plate (10) by adhesive (50).

9. The magnetic element as described in claim 1 or 8, characterized in that: The base plate (10) is provided with several pads (11) for raising the magnetic core (20).

10. An insulating paper frame for a magnetic element, characterized in that: The insulating paper skeleton is made by rolling insulating paper into a cylindrical shape so that it can be sleeved on the magnetic core column of the magnetic element, and several through holes are opened on the cylindrical body.

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