Transformer structure with high heat dissipation effect

Abstract

The transformer structure with the high heat dissipation effect comprises a coil assembly, a magnetic core assembly and a heat dissipation piece, and a coil inner hole is formed in the coil assembly; a magnetic core middle column is arranged on the magnetic core assembly and arranged in the coil inner hole in a penetrating mode. The heat dissipation piece comprises a special-shaped heat dissipation piece, the special-shaped heat dissipation piece comprises a concentrated heat absorption part and a heat dissipation part, the concentrated heat absorption part is arranged in the inner hole of the coil in a penetrating mode and located between the coil assembly and the magnetic core middle column, one end of the heat dissipation part is connected with the concentrated heat absorption part, and the other end of the heat dissipation part is bent and extends out of the inner hole of the coil. Thus, the heat dissipation effect of the transformer can be improved, the size of the transformer can be reduced, the miniaturization design of the transformer is achieved, and then the cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, and in particular to a transformer structure with high heat dissipation effect. Background Art

[0002] As an important equipment in the power system, the main function of the transformer is to change the AC voltage through the principle of electromagnetic induction to achieve the transmission, distribution and use of electric energy. During the operation of the transformer, the temperature of the transformer will rise due to the heat generated by the current passing through the internal resistance, as well as the hysteresis and eddy current loss in the magnetic core. Especially for high-power transformers, current high-power transformers generally have heat dissipation difficulties. For example, there is a serious overheating phenomenon between the inner hole of the coil and the middle column of the magnetic core, which restricts the improvement of the power density of the transformer. The current common solution is to increase the size of the magnetic core to increase the heat dissipation area, but this will not only increase the volume of the transformer product, but also increase the production cost of the transformer product. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a transformer structure with high heat dissipation effect, thereby improving the heat dissipation effect of the transformer and reducing the volume of the transformer.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A transformer structure with high heat dissipation effect comprises: a coil assembly, a magnetic core assembly and a heat sink, wherein a coil inner hole is formed on the coil assembly; a magnetic core center column is arranged on the magnetic core assembly, and the magnetic core center column is penetrated in the coil inner hole; the heat sink comprises a special-shaped heat sink, and the special-shaped heat sink comprises a concentrated heat absorption part and a heat dissipation part, the concentrated heat absorption part is penetrated in the coil inner hole, and the concentrated heat absorption part is located between the coil assembly and the magnetic core center column, one end of the heat dissipation part is connected to the concentrated heat absorption part, and the other end of the heat dissipation part is bent and extended to the outside of the coil inner hole.

[0006] In one embodiment, the cross-section of the concentrated heat absorption portion is an arc-shaped structure, so that the concentrated heat absorption portion has a first arc surface and a second arc surface, the first arc surface faces the inner wall of the coil inner hole, and the second arc surface faces the core center column.

[0007] In one embodiment, the heat dissipation part includes a heat dissipation enhancement end and a bent connection end, the bent connection end is respectively connected to the concentrated heat absorption part and the heat dissipation enhancement end, and the width of the heat dissipation enhancement end and the width of the concentrated heat absorption part are respectively larger than the bent connection end.

[0008] In one of the embodiments, the special-shaped heat sink is a metal heat sink.

[0009] In one of the embodiments, two special-shaped heat sinks are provided, the concentrated heat absorption parts in the two special-shaped heat sinks are respectively penetrated into the inner hole of the coil, and the two special-shaped heat sinks are arranged opposite to each other.

[0010] In one embodiment, the coil assembly includes a plurality of coils and a plurality of insulating sheets, and any one of the insulating sheets is located between two of the coils.

[0011] In one embodiment, the magnetic core assembly includes an upper magnetic core and a lower magnetic core, the upper magnetic core is provided with an upper magnetic core center column, the lower magnetic core is provided with a lower magnetic core center column, and the upper magnetic core center column and the lower magnetic core center column are respectively inserted into the inner hole of the coil.

[0012] In one of the embodiments, an upper limit block is arranged around the periphery of the upper magnetic core middle column, and a heat dissipation part avoidance area is arranged on the upper limit block; the heat dissipation part avoidance area is used to avoid the heat dissipation part so that the heat dissipation part is exposed.

[0013] In one of the embodiments, a bearing base is further included, the magnetic core component is mounted on the bearing base, and the connecting end of the coil component passes through the bearing base.

[0014] In one embodiment, the supporting base is an insulating supporting base.

[0015] Compared with the prior art, the present invention has at least the following advantages:

[0016] The transformer structure with high heat dissipation effect of the present invention is provided with a coil assembly, a magnetic core assembly and a heat sink, specifically, by providing a special-shaped heat sink, and making the concentrated heat absorption part on the special-shaped heat sink penetrate into the inner hole of the coil and be located between the coil assembly and the magnetic core center column, so that the heat of the coil assembly and the magnetic core center column can be first quickly absorbed and concentrated on the concentrated heat absorption part, and then the heat is quickly conducted to the heat dissipation part through the concentrated heat absorption part, and the heat is quickly dissipated through the heat dissipation part. In this way, not only the heat dissipation effect of the transformer can be improved, but also the volume of the transformer can be reduced, the miniaturization design of the transformer can be realized, and the cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0018] Figure 1 It is a schematic structural diagram of a transformer structure with high heat dissipation effect in one embodiment of the present invention;

[0019] Figure 2 for Figure 1A first exploded structural diagram of a transformer structure with high heat dissipation effect;

[0020] Figure 3 for Figure 1 A second exploded structural diagram of a transformer structure with high heat dissipation effect;

[0021] Figure 4 for Figure 1 A schematic diagram of the structure of a special-shaped heat sink of a transformer structure with high heat dissipation effect;

[0022] Figure 5 for Figure 1 A schematic diagram of the structure of a heat sink of a transformer structure with high heat dissipation effect; DETAILED DESCRIPTION

[0023] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings.

[0024] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a transformer structure with high heat dissipation effect includes: a coil assembly 100, a magnetic core assembly 200 and a heat sink 300, wherein a coil inner hole is formed on the coil assembly 100; a magnetic core center column is arranged on the magnetic core assembly 200, and the magnetic core center column is penetrated in the coil inner hole; the heat sink 300 includes a special-shaped heat sink 310, and the special-shaped heat sink 310 includes a concentrated heat absorption portion 311 and a heat dissipation portion 312, the concentrated heat absorption portion 311 is penetrated in the coil inner hole, and the concentrated heat absorption portion 311 is located between the coil assembly 100 and the magnetic core center column, one end of the heat dissipation portion 312 is connected to the concentrated heat absorption portion 311, and the other end of the heat dissipation portion 312 is bent and extended to the outside of the coil inner hole.

[0025] It should be noted that by setting the heat sink 300 on the transformer, the heat dissipation effect of the transformer can be improved. Specifically, by setting the special-shaped heat sink 310, and making the concentrated heat absorption part 311 on the special-shaped heat sink 310 penetrate into the inner hole of the coil, and be located between the coil assembly 100 and the core center column, so that the heat of the coil assembly 100 and the core center column can be quickly absorbed and concentrated on the concentrated heat absorption part 311, and then the heat is quickly conducted to the heat dissipation part 312 through the concentrated heat absorption part 311, and the heat is quickly dissipated through the heat dissipation part 312, which effectively reduces the temperature, and also reduces the core loss, greatly improving the power density of the transformer. In this way, not only can the heat dissipation effect of the transformer be improved, but also the volume of the transformer can be reduced, and the miniaturization design of the transformer can be realized, and then the cost can be reduced. For example, the conventional method to solve the problem of the inner hole of the coil and the center column of the magnetic core is to increase the size of the magnetic core, which will increase the volume of the entire transformer product at the same time, and will directly lead to an increase in the raw material consumption of the transformer by 10-20%. By adding a special-shaped heat sink 310 to the transformer, the volume of the transformer with the same power can be reduced by more than 10%, thereby realizing the miniaturization design of the transformer.

[0026] In one embodiment, the cross section of the concentrated heat absorption part 311 is an arc-shaped structure, so that the concentrated heat absorption part 311 has a first arc surface 311a and a second arc surface 311b, the first arc surface 311a faces the inner side wall of the inner hole of the coil, and the second arc surface 311b faces the middle column of the magnetic core. That is, the concentrated heat absorption part 311 is designed to match the actual shape of the inner hole of the coil and the middle column of the magnetic core. In this embodiment, the side wall of the inner hole of the coil and the side wall of the middle column of the magnetic core are both arc-shaped structures, so the corresponding first arc surface 311a and second arc surface 311b of the concentrated heat absorption part 311 are both arc-shaped structures, so that it is not only convenient to install the heat sink 300, but also can increase the contact area between the concentrated heat absorption part 311 and the side wall of the inner hole of the coil and the middle column of the magnetic core, so as to improve the heat conduction effect, and further improve the heat dissipation effect.

[0027] In one embodiment, the heat dissipation portion 312 includes a heat dissipation enhancement end 312a and a bent connection end 312b, the bent connection end 312b is connected to the concentrated heat absorption portion 311 and the heat dissipation enhancement end 312a, respectively, and the width of the heat dissipation enhancement end 312a and the width of the concentrated heat absorption portion 311 are respectively larger than the bent connection end 312b. The width of the bent connection end 312b is made smaller than the size of the heat dissipation enhancement end 312a and the concentrated heat absorption portion 311, so that the heat dissipation portion 312 can be bent more easily. At the same time, increasing the area of ​​the heat dissipation enhancement end 312a can further increase the heat dissipation speed, thereby further improving the heat dissipation effect of the transformer.

[0028] Preferably, the special-shaped heat sink 310 is a metal heat sink. Metal materials have high thermal conductivity, so the heat between the coil assembly 100 and the core center column can be quickly transferred to the concentrated heat absorption portion 311, and then quickly dissipated through the heat dissipation portion 312, thereby achieving rapid heat dissipation of the inner hole of the transformer coil and improving the heat dissipation effect. In this embodiment, the metal heat sink is preferably a copper heat sink, so that a high heat dissipation effect can be achieved. At the same time, the use of a copper heat sink can also effectively solve the magnetic interference and radiation problems caused by the transformer in the power module, which can help reduce the EMC (Electromagnetic Compatibility) of the power module.

[0029] In one embodiment, two special-shaped heat sinks 310 are provided, and the concentrated heat absorption parts 311 of the two special-shaped heat sinks 310 are respectively penetrated into the inner holes of the coil, and the two special-shaped heat sinks 310 are arranged opposite to each other. That is, the special-shaped heat sink 310 adopts a half-type structure instead of an integral structure, and two special-shaped heat sinks 310 are used in combination, so that the concentrated heat absorption part 311 on the special-shaped heat sink 310 can be filled with a larger area between the coil assembly 100 and the core center column, which is not only beneficial to the processing of the special-shaped heat sink 310, but also beneficial to the installation of the special-shaped heat sink 310 into the inner hole of the coil (if the special-shaped heat sink 310 with an integral structure is adopted, the concentrated heat absorption part 311 is cylindrical, and the cylindrical concentrated heat absorption part 311 is prone to dimensional deviation due to processing errors during the processing. When the dimensional deviation is large, it will cause the concentrated heat absorption part 311 to be unable to be installed in the coil, or the core center column will be unable to be installed in the inner hole of the coil. However, the special-shaped heat sink 310 with a half-type structure combination does not have this problem, and the dimensional accuracy requirement is lower).

[0030] In one embodiment, the coil assembly 100 includes a plurality of coils 110 and a plurality of insulating sheets 120, and any insulating sheet 120 is located between two coils 110. The insulating sheet 120 serves as an insulator, thereby ensuring the electrical safety and reliability of the transformer, and providing certain mechanical support and protection for the coils 110. For example, the insulating sheet 120 may be made of insulating materials such as polyimide film or silicone rubber, preferably silicone rubber, which has the characteristics of high temperature resistance and corrosion resistance, can maintain stable performance in harsh environments, and has better mechanical properties, can withstand certain pressure and impact, and thus can improve the performance of the transformer.

[0031] In one embodiment, the magnetic core assembly 200 includes an upper magnetic core 210 and a lower magnetic core 220. An upper magnetic core middle column 211 is disposed on the upper magnetic core 210, and a lower magnetic core middle column 221 is disposed on the lower magnetic core 220. The upper magnetic core middle column 211 and the lower magnetic core middle column 221 are respectively inserted into the inner hole of the coil. In this way, the upper magnetic core middle column 211 and the lower magnetic core middle column 221 can be easily installed into the inner hole of the coil.

[0032] In one embodiment, an upper limit block is provided around the periphery of the upper magnetic core middle column 211, and a heat dissipation part avoidance area 211a is provided on the upper limit block; the heat dissipation part avoidance area 211a is used to avoid the heat dissipation part 312 so that the heat dissipation part 312 is exposed. In this way, the contact area between the heat dissipation part 312 and the outside world can be increased, thereby further improving the heat dissipation effect.

[0033] In one embodiment, the transformer structure with high heat dissipation effect further includes a bearing base 400, the magnetic core assembly 200 is mounted on the bearing base 400, and the connection end of the coil assembly 100 passes through the bearing base 400. The magnetic core assembly 200 and the coil assembly 100 are supported by the bearing base 400 to facilitate the installation of the transformer. Preferably, the bearing base 400 is an insulating bearing base 400, and the insulating bearing base 400 is a plastic base, so that the insulation effect of the transformer can be improved, thereby improving the safety of the transformer.

[0034] See also Figure 5 As shown, in one embodiment, in order to further improve the heat dissipation effect of the transformer, an enhanced heat dissipation layer 313 is further provided on the special-shaped heat sink 310, and one end of the enhanced heat dissipation layer 313 is connected to the heat dissipation portion 312; the other end of the enhanced heat sink extends to the top of the heat dissipation portion 312, and is arranged relative to the heat dissipation portion 312 at a distance. In this way, the contact area between the special-shaped heat sink 310 and the outside world can be further increased, thereby further improving the heat dissipation effect. In this embodiment, in order to further improve the heat dissipation speed, the cross-section of the enhanced heat dissipation layer 313 is wavy, thereby further increasing the heat dissipation area and improving the heat dissipation speed. For example, the enhanced heat dissipation layer 313 can be arranged on the heat dissipation portion 312 by welding.

[0035] See also Figure 5 As shown, in one embodiment, in order to prevent the heat of the heat dissipation portion 312 located on the coil assembly 100 from continuing to be conducted to the coil assembly 100, a heat insulation layer 314 is provided on one side of the heat dissipation portion 312 close to the coil assembly 100. The heat insulation layer 314 prevents the heat from continuing to be conducted toward the coil assembly 100, thereby further improving the heat dissipation effect. In this embodiment, the heat insulation layer 314 can be a heat insulation material such as epoxy resin, polyurethane foam, polyester fiber felt, and aerogel felt.

[0036] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A transformer structure with high heat dissipation effect, characterized in that: include: A coil assembly having a coil inner hole formed therein; A magnetic core assembly, wherein the magnetic core assembly is provided with a magnetic core center column, and the magnetic core center column is inserted into the inner hole of the coil; and The heat sink comprises a special-shaped heat sink, the special-shaped heat sink comprises a concentrated heat absorption portion and a heat dissipation portion, the concentrated heat absorption portion is penetrated into the inner hole of the coil, and the concentrated heat absorption portion is located between the coil assembly and the core center column, one end of the heat dissipation portion is connected to the concentrated heat absorption portion, and the other end of the heat dissipation portion is bent and extended to the outside of the inner hole of the coil.

2. The transformer structure with high heat dissipation effect according to claim 1, characterized in that: The cross section of the concentrated heat absorption part is an arc-shaped structure, so that the concentrated heat absorption part has a first arc surface and a second arc surface, the first arc surface faces the inner side wall of the coil inner hole, and the second arc surface faces the core center column.

3. The transformer structure with high heat dissipation effect according to claim 1, characterized in that: The heat dissipation part includes a heat dissipation enhancement end and a bent connection end, the bent connection end is respectively connected to the concentrated heat absorption part and the heat dissipation enhancement end, and the width of the heat dissipation enhancement end and the width of the concentrated heat absorption part are respectively greater than the bent connection end.

4. The transformer structure with high heat dissipation effect according to claim 1, characterized in that: The special-shaped heat sink is a metal heat sink.

5. The transformer structure with high heat dissipation effect according to any one of claims 1 to 4, characterized in that: There are two special-shaped heat sinks, the concentrated heat absorption parts in the two special-shaped heat sinks are respectively penetrated in the inner holes of the coil, and the two special-shaped heat sinks are arranged opposite to each other.

6. The transformer structure with high heat dissipation effect according to any one of claims 1 to 4, characterized in that: The coil assembly includes a plurality of coils and a plurality of insulating sheets, and any one of the insulating sheets is located between two of the coils.

7. The transformer structure with high heat dissipation effect according to any one of claims 1 to 4, characterized in that: The magnetic core assembly comprises an upper magnetic core and a lower magnetic core. The upper magnetic core is provided with an upper magnetic core center column, and the lower magnetic core is provided with a lower magnetic core center column. The upper magnetic core center column and the lower magnetic core center column are respectively penetrated in the inner hole of the coil.

8. The transformer structure with high heat dissipation effect according to claim 7, characterized in that: An upper limit block is arranged around the periphery of the middle column of the upper magnetic core, and a heat dissipation part avoidance area is arranged on the upper limit block; the heat dissipation part avoidance area is used to avoid the heat dissipation part so that the heat dissipation part is exposed.

9. The transformer structure with high heat dissipation effect according to any one of claims 1 to 4, characterized in that: It also includes a bearing base, the magnetic core component is installed on the bearing base, and the connecting end of the coil component passes through the bearing base.

10. The transformer structure with high heat dissipation effect according to claim 9, characterized in that: The bearing base is an insulating bearing base.

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