Miniature mutual inductor with built-in heat transfer and heat dissipation piece
By incorporating a ring-shaped heat-conducting plate into the miniature current transformer and combining it with a housing, the problem of untimely heat dissipation in the miniature current transformer is solved, enabling rapid heat removal and improving the performance and lifespan of the equipment.
Patent Information
- Application Number
- CN202520083616.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-14
AI Technical Summary
Existing miniature current transformers suffer from reduced performance and lifespan due to their inability to dissipate heat in a timely manner during operation.
A miniature current transformer with built-in heat transfer and heat dissipation components was designed. It adopts a combination structure of annular heat-conducting plate and shell, and contacts the outside air through the through hole to achieve rapid heat dissipation.
This effectively improves the heat dissipation efficiency of miniature current transformers, extends the service life of the equipment, and enhances its practicality.
Smart Images
Figure CN223828302U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of current transformer technology, specifically relating to a miniature current transformer with built-in heat transfer and heat dissipation components. Background Technology
[0002] A miniature current transformer is an electrical device used to transmit electrical energy or signals. It converts electrical energy in one circuit into electrical energy in another circuit through the principle of electromagnetic induction.
[0003] In existing technologies, miniature instrument transformers generate heat during operation, due to factors such as core loss, coil resistance loss, or excessive load current. However, the enclosed casing of miniature instrument transformers prevents the internal heat from being dissipated in a timely manner, which can negatively impact the transformer's performance and lifespan over time. Utility Model Content
[0004] This utility model provides a miniature current transformer with a built-in heat transfer and heat dissipation component, which aims to solve the problem of poor practicality of existing miniature current transformers due to their inability to dissipate heat in a timely manner.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a miniature current transformer with a built-in heat transfer and heat dissipation component, comprising:
[0006] The housing has an annular cavity; the housing has a central hole coaxially arranged with the annular cavity and for a primary side conductor to pass through; along the axial direction of the central hole, the two ends of the housing have annular end faces, and each annular end face has a plurality of through holes communicating with the annular cavity;
[0007] Two annular heat-conducting plates are provided, and the two annular heat-conducting plates are spaced apart in the annular cavity along the axial direction of the central hole;
[0008] An iron core is disposed in the annular cavity and located between the two annular heat-conducting plates;
[0009] The winding is wound around the iron core, and the combination of the winding and the iron core abuts against the two annular heat-conducting plates respectively.
[0010] In one possible implementation, the cross-section of the iron core is rectangular.
[0011] In one possible implementation, the housing includes:
[0012] The upper annular shell has an open upper annular cavity;
[0013] The lower half-ring shell is fixedly connected to the upper half-ring shell; the lower half-ring shell has an open lower annular cavity, which is used to combine with the upper annular cavity to form an annular cavity after the lower half-ring shell is engaged with the upper annular shell.
[0014] The annular end faces are respectively disposed on the upper half-ring shell and the lower half-ring shell.
[0015] In one possible implementation, the upper half-ring shell is integrally bonded to the lower half-ring shell.
[0016] In one possible implementation, each of the through holes on each of the annular end faces is arranged at annular intervals around the axis of the central hole.
[0017] In one possible implementation, the annular heat-conducting sheet is an annular sheet structure made of alumina plate.
[0018] In one possible implementation, an elastic pad is provided between each of the annular heat-conducting sheets and the annular end face.
[0019] In this implementation, the outer casing facilitates secure installation and protects the internal iron core and windings. Annular heat-conducting plates are spaced apart within the annular cavity of the outer casing, sandwiching the wound iron core. Because the annular heat-conducting plates have excellent thermal conductivity, they can rapidly exchange heat with the wound iron core through contact with it. Furthermore, the heat is facilitated by contact with the external air through corresponding through-holes, resulting in timely heat dissipation and high practicality. Attached Figure Description
[0020] Figure 1 A schematic diagram of the structure of a miniature current transformer with built-in heat transfer and heat dissipation components provided in an embodiment of this utility model;
[0021] Figure 2 A cross-sectional view of a miniature current transformer with a built-in heat transfer and heat dissipation component provided in an embodiment of this utility model.
[0022] Explanation of reference numerals in the attached figures:
[0023] 10. Outer shell; 11. Upper half-ring shell; 12. Lower half-ring shell; 13. Ring-shaped cavity; 14. Center hole; 15. Through hole; 20. Ring-shaped heat-conducting plate; 30. Iron core; 40. Winding; 50. Elastic pad. Detailed Implementation
[0024] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0025] Please refer to the following: Figure 1 and Figure 2 The present invention provides a miniature current transformer with a built-in heat transfer and heat dissipation component. The miniature current transformer with a built-in heat transfer and heat dissipation component includes a housing 10, an annular heat-conducting plate 20, an iron core 30, and a winding 40. The housing 10 has an annular cavity 13. The housing 10 has a central hole 14 coaxially arranged with the annular cavity 13 and through which a primary side conductor passes. Along the axial direction of the central hole 14, both ends of the housing 10 have annular end faces, and each annular end face is evenly distributed with multiple through holes 15 communicating with the annular cavity 13. Two annular heat-conducting plates 20 are provided, and the two annular heat-conducting plates 20 are spaced apart in the annular cavity 13 along the axial direction of the central hole 14. The iron core 30 is disposed in the annular cavity 13 and located between the two annular heat-conducting plates 20. The winding 40 is wound around the iron core 30, and the combination of the winding 40 and the iron core 30 abuts against the two annular heat-conducting plates 20 respectively.
[0026] Regarding the miniature current transformer with built-in heat transfer and heat dissipation components provided in this embodiment, its working principle is that the heat generated on the iron core 30 and the winding 40 is transferred to the annular heat-conducting plate 20, and then the annular heat-conducting plate 20 is discharged through the corresponding multiple through holes 15.
[0027] Compared with the prior art, the miniature current transformer with built-in heat transfer and heat dissipation components provided in this embodiment allows for easy fixed installation of the housing 10, while also protecting the internal iron core 30 and winding 40. Annular heat-conducting plates 20 are spaced apart within the annular housing 13 of the housing 10, sandwiching the iron core 30 with the winding 40 wound within them. Because the annular heat-conducting plates 20 have excellent thermal conductivity, they can quickly exchange heat with the iron core 30 with the winding 40 through contact with it. Furthermore, the heat is facilitated by contact with the external air through the corresponding through holes 15, making it highly practical.
[0028] It should be noted that the annular heat-conducting plate 20 can also block the multiple through holes 15 on the outer casing 10, thereby effectively protecting the iron core 30 with the winding 40 inside.
[0029] In some embodiments, the aforementioned iron core 30 may be adopted as follows: Figure 2 The structure shown. See also Figure 2 The cross-section of the iron core 30 is rectangular.
[0030] Firstly, the rectangular cross-section of the iron core 30 facilitates manufacturing. Simultaneously, the rectangular cross-section ensures constraint on the winding 40, resulting in a rectangular winding of the coil. This structure ensures that the two surfaces corresponding to the two annular heat-conducting plates 20 are annular planes, thereby increasing the contact area with the annular heat-conducting plates 20, further enhancing heat exchange capacity, and ensuring timely heat dissipation. This design is highly practical.
[0031] In this embodiment, the material of the iron core 30 can be silicon steel sheet.
[0032] In some embodiments, the housing 10 may be adopted as follows: Figure 1 and Figure 2 The structure shown. See also Figure 1 and Figure 2 The outer casing 10 includes an upper annular shell 11 and a lower annular shell 12. The upper annular shell 11 has an open upper annular cavity. The lower annular shell 12 is fixedly connected to the upper annular shell 11. The lower annular shell 12 has an open lower annular cavity, which is used to form an annular cavity 13 after the lower annular shell 12 is mated with the upper annular shell 11.
[0033] The annular end faces are respectively set on the upper half-annular shell 11 and the lower half-annular shell 12.
[0034] The combination of the upper ring shell 11 and the lower ring shell 12 facilitates assembly and manufacturing, resulting in a simple structure and strong practicality.
[0035] In this embodiment, both the upper half-ring shell 11 and the lower half-ring shell 12 are provided with annular holes. After the upper half-ring shell 11 and the lower half-ring shell 12 are aligned, the two annular holes combine to form a central hole 14.
[0036] In some embodiments, the upper annular shell 11 and the lower annular shell 12 can be adopted as follows: Figure 2 The structure shown. See also Figure 2 The upper half-ring shell 11 and the lower half-ring shell 12 are bonded together as a whole. The bonded structure is more adaptable to miniaturization or micro-scale and is easier to operate.
[0037] In this embodiment, the upper half-ring shell 11 and the lower half-ring shell 12 can adopt a tongue and groove joint structure, which also increases the bonding area between the two.
[0038] In some embodiments, the aforementioned annular end face may be as follows: Figure 2 The structure shown. See also Figure 2 Each through hole 15 on each annular end face is arranged at annular intervals around the axis of the central hole 14.
[0039] Multiple through holes 15 are provided on each annular end face to ensure that the contact area between the annular heat-conducting plate 20 and the air is increased, thereby improving the heat dissipation effect. The through holes 15 are arranged in annular intervals around the axis of the central hole 14 to ensure uniform heat dissipation and strong practicality.
[0040] In some embodiments, the annular heat-conducting sheet 20 described above can be adopted as follows: Figure 1 and Figure 2 The structure shown. See also Figure 1 and Figure 2 The annular heat-conducting plate 20 is an annular sheet structure made of alumina plate.
[0041] Alumina plate is a thermally conductive and insulating material, and its lightweight nature ensures timely heat dissipation from the annular cavity 13.
[0042] As a specific implementation of this embodiment, each annular heat-conducting plate 20 has annular folded edges on both its outer edge and inner edge (the inner edge and the edge of the inner hole), and the iron core 30 with the winding 40 is placed between the two annular folded edges. This structure can ensure that the contact area between the annular heat-conducting plate 20 and the iron core 30 with the winding 40 is increased, thereby further improving the heat dissipation effect.
[0043] It should be noted that the height of the annular fold on each annular heat-conducting plate 20 must be less than half the thickness of the iron core 30 with the winding 40 wound around it, so as to ensure that the annular heat-conducting plate 20 can stably contact the iron core 30 with the winding 40 wound around it, and ensure the heat exchange effect.
[0044] In some embodiments, the annular heat-conducting sheet 20 described above can be adopted as follows: Figure 2 The structure shown. See also Figure 2 Each annular heat-conducting plate 20 is provided with an elastic pad 50 between itself and the annular wall.
[0045] In this embodiment, each annular heat-conducting plate 20 is slidably disposed in the annular cavity 13, and the sliding direction is along the axial direction of the central hole 14.
[0046] Multiple through holes 15 are arranged annularly around the axis of the central hole 14 on each annular end face, with a gap between any two adjacent through holes 15. Each elastic pad 50 may include multiple silicone rubber pads, each corresponding to a gap to ensure uniform and stable support for the annular heat-conducting sheet 20. In addition, each annular heat-conducting element is bounced by the elastic pad 50, and the two move relative to each other, thereby ensuring that the two annular heat-conducting elements are stably in contact with the iron core 30 on which the winding 40 is wound.
[0047] Of course, during the assembly of the outer casing 10, manufacturing errors may occur, and the annular heat-conducting component may become loose, that is, it may move in the axial direction of the central hole 14; it is also possible that the upper half of the annular shell 11 and the lower half of the annular shell 12 cannot be aligned, and thus cannot be fixedly connected. In this case, the elastic pad 50 can be used for compensation to ensure the stability of the annular heat-conducting plate 20 and the iron core 30 with the winding 40.
[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A miniature current transformer with built-in heat transfer and heat dissipation components, characterized in that, include: The housing has an annular cavity; the housing has a central hole coaxially arranged with the annular cavity and through which a primary side wire passes; Along the axial direction of the central hole, both ends of the outer shell have annular end faces, and each annular end face is evenly distributed with a plurality of through holes communicating with the annular cavity; Two annular heat-conducting plates are provided, and the two annular heat-conducting plates are spaced apart in the annular cavity along the axial direction of the central hole; An iron core is disposed in the annular cavity and located between the two annular heat-conducting plates; The winding is wound around the iron core, and the combination of the winding and the iron core abuts against the two annular heat-conducting plates respectively.
2. The miniature current transformer with built-in heat transfer and heat dissipation components as described in claim 1, characterized in that, The cross-section of the iron core is rectangular.
3. The miniature current transformer with built-in heat transfer and heat dissipation components as described in claim 1, characterized in that, The outer casing includes: The upper annular shell has an open upper annular cavity; The lower half-ring shell is fixedly connected to the upper half-ring shell; the lower half-ring shell has an open lower annular cavity, which is used to combine with the upper annular cavity to form an annular cavity after the lower half-ring shell is engaged with the upper annular shell. The annular end faces are respectively disposed on the upper half-ring shell and the lower half-ring shell.
4. The miniature current transformer with built-in heat transfer and heat dissipation components as described in claim 3, characterized in that, The upper half-ring shell and the lower half-ring shell are integrally bonded together.
5. The miniature current transformer with built-in heat transfer and heat dissipation components as described in claim 1, characterized in that, Each of the through holes on each of the annular end faces is arranged at annular intervals around the axis of the central hole.
6. The miniature current transformer with built-in heat transfer and heat dissipation components as described in claim 1, characterized in that, The annular heat-conducting sheet is a ring-shaped structure made of alumina plate.
7. The miniature current transformer with built-in heat transfer and heat dissipation components as described in claim 1, characterized in that, An elastic pad is provided between each of the annular heat-conducting sheets and the annular end face.