Inductor

Abstract

The inductor comprises a shell, a metal heat conduction block and an inductor body, a cavity is formed in the metal heat conduction block, the inductor body is arranged in the cavity and makes contact with the metal heat conduction block, a lead of the inductor body extends out of the metal heat conduction block, and the metal heat conduction block is fixed in the shell and makes contact with the inner wall of the shell. Heat generated during operation of the inductor body can be transmitted to the shell through the metal heat conduction block, and finally the heat is dissipated through the shell. Compared with the prior art that heat is transferred through pouring heat-conducting glue, the heat-conducting property of the inductor can be greatly improved through the metal heat-conducting block, and therefore stable work of the inductor is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic components, and particularly relates to an inductor. Background Art

[0002] An inductor is an electronic component that can convert electrical energy into magnetic energy and store it. In order to achieve different inductance values and characteristics, there are currently combined potted inductors. A combined potted inductor is an electronic component that combines multiple inductance elements together and is protected through a potting encapsulation process. It usually consists of an iron core and a coil. The iron core can be an air-gap iron core or a magnetic material iron core, and the coil is made of a wire coated with an insulating material. These inductance elements can be connected in series, parallel, or in a hybrid connection by sharing the iron core or connecting the coils.

[0003] During the operation of the inductor, certain heat will be generated. Excessive temperature will have the following hazards:

[0004] 1. Reducing efficiency: Inductive heating will convert electrical energy into heat energy, resulting in a decrease in the overall efficiency of the circuit.

[0005] 2. Shortening the lifespan: High temperature will cause the inductor components to be subjected to thermal stress, accelerating material aging, and thus shortening its service life.

[0006] 3. Increasing circuit noise: Inductive heating may cause local thermal effects inside, increasing the noise inside the circuit and may generate self-thermal noise, affecting the stability of the circuit.

[0007] 4. Affecting inductive performance: Key parameters such as inductance value, resistance value, and frequency characteristics will be affected by thermal effects, which may lead to a decline in inductive performance and affect the overall performance of the circuit.

[0008] 5. Safety hazards: The inductor being in a high-temperature state for a long time may cause damage to the insulating material, and even lead to safety problems such as short circuits or fires, posing a threat to equipment and personnel.

[0009] Currently, inductive heat dissipation usually uses potted thermal conductive silicone as a medium to quickly export the working heat of the inductor, so as to ensure the stable and reliable operation of the product. However, due to the limitations of existing thermal conductive materials and the limitations of the manufacturing process during product manufacturing, the heat dissipation effect of the inductor is poor.

[0010] Therefore, how to improve the heat dissipation effect of the inductor is a technical problem that those skilled in the art need to solve currently. Summary of the Utility Model

[0011] The purpose of the utility model is to provide an inductor that can effectively improve its heat dissipation ability.

[0012] To achieve the above purpose, the utility model provides the following technical solutions:

[0013] An inductor includes: a housing, a metal heat-conducting block, and an inductor body. A chamber is provided in the metal heat-conducting block. The inductor body is placed in the chamber and is in contact with the metal heat-conducting block. The lead of the inductor body extends out of the metal heat-conducting block. The metal heat-conducting block is fixed in the housing and is in contact with the inner wall of the housing.

[0014] In some embodiments, the inductor body includes a magnetic core and a coil. The coil is wound around the magnetic core. A first limiting protrusion is provided at one end of the magnetic core, and a second limiting protrusion is provided at the other end. The metal heat-conducting block includes a coil support block, a first limiting block, and a second limiting block located on both sides of the coil support block. A coil accommodation cavity for accommodating the coil is provided in the coil support block. A first limiting groove for accommodating the first limiting protrusion is provided on the side of the first limiting block facing the coil support block. A second limiting groove for accommodating the second limiting protrusion is provided on the side of the second limiting block facing the coil support block.

[0015] In some embodiments, the coil support block includes a detachable upper support block and a detachable lower support block. The upper support block and the lower support block enclose the coil accommodation cavity. The first limiting block includes a detachable first upper limiting block and a detachable first lower limiting block. The first upper limiting block and the first lower limiting block enclose the first limiting groove. The second limiting block includes a detachable second upper limiting block and a detachable second lower limiting block. The second upper limiting block and the second lower limiting block enclose the second limiting groove.

[0016] In some embodiments, a lead groove for the lead to extend out is provided on the side of the coil support block facing the first limiting block or the second limiting block.

[0017] In some embodiments, the bottom surface of the lower support block is an arc surface. An arc-shaped card slot that cooperates with the lower support block is provided in the housing.

[0018] In some embodiments, the bottom surfaces of the first lower limiting block and the second lower limiting block are arc surfaces. A first arc-shaped boss that cooperates with the bottom of the first lower limiting block and a second arc-shaped boss that cooperates with the bottom of the second lower limiting block are provided in the housing. The structure between the first arc-shaped boss and the second arc-shaped boss forms the arc-shaped card slot.

[0019] In some embodiments, a plurality of the metal heat-conducting blocks are provided in the housing, and one inductor body is provided in each metal heat-conducting block.

[0020] In some embodiments, an insulating layer is provided on the surface of the metal heat-conducting block.

[0021] In some embodiments, a plurality of heat dissipation fins are provided on the outer side surface of the housing.

[0022] In some embodiments, the housing is filled with a thermally conductive adhesive, and the thermally conductive adhesive is used to fill the gaps between the inductor body and the metal heat conduction block, and between the metal heat conduction block and the housing.

[0023] Compared with the prior art, the above technical solution has the following advantages:

[0024] An inductor provided by the present utility model includes: a housing, a metal heat conduction block, and an inductor body. A cavity is provided in the metal heat conduction block. The inductor body is placed in the cavity and is in contact with the metal heat conduction block. The lead of the inductor body extends out of the metal heat conduction block. The metal heat conduction block is fixed in the housing and is in contact with the inner wall of the housing. The heat generated during the operation of the inductor body will be transferred to the housing through the metal heat conduction block, and finally the heat will be dissipated through the housing. Compared with the prior art of transferring heat through potting thermally conductive adhesive, the use of the metal heat conduction block can greatly improve the thermal conductivity of the inductor, thereby ensuring the stable operation of the inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0026] Figure 1 It is a schematic structural diagram of an inductor provided by a specific embodiment of the present utility model;

[0027] Figure 2 It is a schematic structural diagram of the housing of an inductor provided by a specific embodiment of the present utility model;

[0028] Figure 3 It is a schematic structural diagram of the metal heat conduction block of an inductor provided by a specific embodiment of the present utility model;

[0029] Figure 4 It is a schematic structural diagram of the inductor body of an inductor provided by a specific embodiment of the present utility model.

[0030] The reference numerals are as follows:

[0031] 10 - housing, 11 - arc-shaped card slot, 12 - first arc-shaped boss, 13 - second arc-shaped boss, 14 - heat dissipation fin;

[0032] 20-metal heat conducting block, 21-coil supporting block, 211-upper supporting block, 212-lower supporting block, 22-first limiting block, 221-first upper limiting block, 222-first lower limiting block, 23-second limiting block, 231-second upper limiting block, 232-second lower limiting block;

[0033] 30 - inductor body, 31 - lead wire, 32 - coil, 33 - first limiting protrusion, 34 - second limiting protrusion. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] Please refer to Figures 1 to 4 An inductor provided by an embodiment of the utility model includes: a shell 10, a metal heat-conducting block 20 and an inductor body 30, wherein the shell 10 is preferably a metal shell 10, a chamber is provided in the metal heat-conducting block 20, the inductor body 30 is placed in the chamber and contacts the metal heat-conducting block 20, a lead 31 of the inductor body 30 extends out of the metal heat-conducting block 20, the metal heat-conducting block 20 is fixed in the shell 10 and contacts the inner wall of the shell 10, the heat generated by the inductor body 30 during operation will be transferred to the shell 10 through the metal heat-conducting block 20, and finally the heat will be dissipated through the shell 10. The prior art is to fill the shell 10 with thermally conductive adhesive, and mainly transfer heat through the thermally conductive adhesive. Since the thermal conductivity of the thermally conductive adhesive is relatively low compared to the metal thermally conductive block 20 (the thermal conductivity of metal is usually tens to hundreds of W / (m·K), and the thermal conductivity of most thermally conductive adhesives is between 0.1W / (m·K) and 2W / (m·K)), under the premise that other conditions remain unchanged, the thermal conductivity of the inductor can be greatly improved by the metal thermally conductive block 20, thereby ensuring the stable operation of the inductor.

[0036] In some embodiments, Figure 3 and Figure 4As shown, the inductor body 30 includes a magnetic core and a coil 32 wound around the magnetic core. A first limiting protrusion 33 is provided at one end of the magnetic core, and a second limiting protrusion 34 is provided at the other end. The metal heat-conducting block 20 includes a coil support block 21 and a first limiting block 22 and a second limiting block 23 on both sides of the coil support block 21. That is, the metal heat-conducting block 20 is a split structure, which is convenient for the installation of the inductor body 30. A coil accommodation cavity for accommodating the coil 32 is provided in the coil support block 21. A first limiting groove for accommodating the first limiting block 22 is provided on the side of the first limiting block 22 facing the coil support block 21, and a second limiting groove for accommodating the second limiting block 23 is provided on the side of the second limiting block 23 facing the coil support block 21. The heat generated by the coil 32 can be dissipated through the coil support block 21, and the heat generated by the magnetic core is dissipated through the first limiting block 22 and the second limiting block 23. The first limiting block 22 and the second limiting block 23 can limit the axial position of the inductor body 30. Specifically, please refer to Figure 3 , to facilitate the heat dissipation of the coil 32, the projections of the first limiting block 22 and the second limiting block 23 along the axial direction of the coil 32 are located within the projection range of the coil support block 21, and a part of the coil accommodation cavity is exposed outside the first limiting block 22 and the second limiting block 23.

[0037] In some embodiments, to further facilitate the installation of the inductor body 30, the coil support block 21 includes a detachable upper support block 2 and a lower support block 2, and the upper support block 2 and the lower support block 2 enclose the coil accommodation cavity. The first limiting block 22 includes a detachable first upper limiting block 221 and a first lower limiting block 222, and the first upper limiting block 221 and the first lower limiting block 222 enclose the first limiting groove. The second limiting block 23 includes a detachable second upper limiting block 231 and a second lower limiting block 232, and the second upper limiting block 231 and the second lower limiting block 232 enclose the second limiting groove. During installation, the lower support block 2, the first lower limiting block 222 and the second lower limiting block 232 can be first installed in the housing 10, and then the inductor body 30 is installed in the coil accommodation cavity, the first limiting groove and the second limiting groove, and finally the upper support block 2, the first upper limiting block 221 and the second upper limiting block 231 are buckled on the inductor body 30. In addition, the inductor body 30 can also be first assembled in the metal heat-conducting block 20, and then the metal heat-conducting block 20 is fixed in the housing 10. The upper support block 2 and the lower support block 2, the first upper limiting block 221 and the first lower limiting block 222, and the second upper limiting block 231 and the second lower limiting block 232 can all be fixed by pins or screws.

[0038] In some embodiments, such as Figure 1 and Figure 3As shown, on one side of the coil support block 21 facing the first limit block 22 or the second limit block 23, there is a lead 31 groove for the lead 31 to extend out. Through the lead 31 groove, it is convenient to lead out the lead 31. The lead 31 is preferably in a sheet structure, and the cross-section of the lead 31 groove is also a corresponding rectangular structure.

[0039] In some embodiments, such as Figure 2 and Figure 3 As shown, the bottom surface of the lower support block 2 is an arc surface. Inside the housing 10, there is an arc-shaped card slot 11 that cooperates with the lower support block 2. Through the arc-shaped card slot 11, on the one hand, the lower support block 2 can be limited and fixed, and on the other hand, the contact between the lower support block 2 and the tip of the housing 10 can be reduced, thereby avoiding the lower support block 2 piercing the housing 10. The bottom surfaces of the first lower limit block 222 and the second lower limit block 232 are arc surfaces. Inside the housing 10, there is a first arc-shaped boss 12 that cooperates with the bottom of the first lower limit block 222, and a second arc-shaped boss 13 that cooperates with the bottom of the second lower limit block 232. The structure between the first arc-shaped boss 12 and the second arc-shaped boss 13 forms the arc-shaped card slot 11. Among them, through the first arc-shaped boss 12 and the second boss, on the one hand, the first limit block 22 and the second limit block 23 can be staggered from the coil support block 21 for heat dissipation, and on the other hand, the arc-shaped card slot 11 can be formed for the installation of the coil support block 21. In addition, it can also play the role of a reinforcing rib, which is beneficial to improving the strength of the housing 10.

[0040] In some embodiments, there are multiple metal heat-conducting blocks 20 inside the housing 10, and each metal heat-conducting block 20 is provided with an inductor body 30. As Figure 1 shown, the multiple metal heat-conducting blocks 20 are distributed along the axial direction of the coil 32. The first limit blocks 22 and the second limit blocks 23 of two adjacent metal heat-conducting blocks 20 can be integrally formed for easy manufacturing and installation.

[0041] In some embodiments, the surface of the metal heat-conducting block 20 is provided with an insulating layer. Specifically, an insulating layer can be plated on the surface of the metal heat-conducting block 20 to improve the safety of its operation.

[0042] In some embodiments, in order to improve the heat dissipation effect of the inductor, several heat dissipation fins 14 are provided on the outer side surface of the housing 10. As Figure 1 and Figure 2 shown, there are multiple heat dissipation fins 14 extending along the horizontal direction on the outer side surface of the housing 10. The heat dissipation fins 14 can be integrally formed on the outside of the housing 10.

[0043] In some embodiments, the housing 10 is filled with a thermal conductive adhesive, which is used to fill the gaps between the inductor body 30 and the metal heat-conducting block 20, as well as between the metal heat-conducting block 20 and the housing 10. By filling with the thermal conductive adhesive, on the one hand, the stability of the inductor body 30 and the metal heat-conducting block 20 can be improved; on the other hand, the insulation performance of the inductor body 30 can be enhanced. Secondly, it can also achieve a certain heat-conducting effect.

[0044] Taking a 30kW photovoltaic inverter inductor as an example, the magnetic cores of the inductor all adopt iron-silicon-aluminum materials with an initial magnetic permeability of 60μ. After the inductor body 30 is encapsulated with glue into the housing 10, the temperature rise test results of each part are in the range of 80°C to 0°C. After setting the metal heat-conducting block 20 to accommodate the inductor body 30, the temperature rise test results of each part are in the range of 60°C to 100°C. Compared with the original scheme, the temperature is reduced by about 25% at most. Further, if a layer of boron nitride ceramic material is plated on the surface of the metal heat-conducting block 20, its insulation performance is also greatly improved.

[0045] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0046] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0047] The above has introduced in detail an inductor provided by the present utility model. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. An inductor, characterized in that, Comprising: A housing (10), a metal heat-conducting block (20), and an inductor body (30). A chamber is provided in the metal heat-conducting block (20). The inductor body (30) is placed in the chamber and is in contact with the metal heat-conducting block (20). The lead (31) of the inductor body (30) extends out of the metal heat-conducting block (20). The metal heat-conducting block (20) is fixed in the housing (10) and is in contact with the inner wall of the housing (10).

2. The inductor according to claim 1, characterized in that, The inductor body (30) includes a magnetic core and a coil (32). The coil (32) is wound around the magnetic core. A first limiting protrusion (33) is provided at one end of the magnetic core, and a second limiting protrusion (34) is provided at the other end. The metal heat-conducting block (20) includes a coil support block (21), a first limiting block (22), and a second limiting block (23) located on both sides of the coil support block (21). A coil accommodation cavity for accommodating the coil (32) is provided in the coil support block (21). A first limiting groove for accommodating the first limiting block (22) is provided on the side of the first limiting block (22) facing the coil support block (21). A second limiting groove for accommodating the second limiting block (23) is provided on the side of the second limiting block (23) facing the coil support block (21).

3. The inductor according to claim 2, wherein The coil support block (21) includes a detachable upper support block (211) and a lower support block (212). The upper support block (211) and the lower support block (212) enclose the coil accommodation cavity. The first limiting block (22) includes a detachable first upper limiting block (221) and a first lower limiting block (222). The first upper limiting block (221) and the first lower limiting block (222) enclose the first limiting groove. The second limiting block (23) includes a detachable second upper limiting block (231) and a second lower limiting block (232). The second upper limiting block (231) and the second lower limiting block (232) enclose the second limiting groove.

4. The inductor according to claim 2, characterized in that, A lead (31) groove for allowing the lead (31) to extend out is provided on one side of the coil support block (21) facing the first limiting block (22) or the second limiting block (23).

5. The inductor according to claim 3, characterized in that, The bottom surface of the lower support block (212) is an arc surface. An arc-shaped card slot (11) matching the lower support block (212) is provided in the housing (10).

6. The inductor according to claim 5, characterized in that, The bottom surfaces of the first lower limiting block (222) and the second lower limiting block (232) are arc surfaces. A first arc-shaped boss (12) matching the bottom of the first lower limiting block (222) and a second arc-shaped boss (13) matching the bottom of the second lower limiting block (232) are provided in the housing (10). The structure between the first arc-shaped boss (12) and the second arc-shaped boss (13) forms the arc-shaped card slot (11).

7. The inductor according to claim 1, wherein, A plurality of the metal heat-conducting blocks (20) are provided in the housing (10), and one inductor body (30) is provided in each metal heat-conducting block (20).

8. The inductor according to claim 1, wherein The surface of the metal heat conducting block (20) is provided with an insulating layer.

9. The inductor according to claim 1, wherein A plurality of heat dissipation fins (14) are provided on the outer side surface of the outer shell (10).

10. The inductor according to claim 1, characterized in that, The outer shell (10) is filled with a heat conducting adhesive, and the heat conducting adhesive is used to fill the gaps between the inductor body (30) and the metal heat conducting block (20), and between the metal heat conducting block (20) and the outer shell (10).

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