Transformer frame

Abstract

The present application relates to the technical field of transformers, and discloses a transformer skeleton, which includes a skeleton body, including a central part and an isolation part; the central part has a plug hole for inserting a transformer core; the isolation part has multiple parts, each of which is surrounded by the central part, and multiple isolation parts are distributed on the central part along the transformer core insertion path; wherein winding slots for winding the primary winding and / or secondary winding coils of the transformer are formed between adjacent isolation parts. The present application can improve the heat dissipation capacity of the transformer.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular, to a transformer skeleton. Background Art

[0002] The transformer skeleton is an important part of a transformer and is mainly used to support and fix coils. Most of the existing transformer skeletons are of single-layer design. For example, the Chinese patent document with the publication number CN203415381U discloses a transformer skeleton and a transformer, in which the winding part on the transformer skeleton is arranged between the primary connecting plate and the secondary connecting plate, and an inner cavity for placing a magnetic core is provided in the middle of the winding part.

[0003] When the coils of the transformer are wound on the winding part, they need to be stacked one by one, and an insulating material is used to isolate between the inner and outer layers, so that the coils located in the inner circle have poor heat dissipation, which is not conducive to improving the service life of the transformer. Summary of the Invention

[0004] In order to improve the heat dissipation capacity of the transformer, the present application provides a transformer skeleton.

[0005] The present application provides a transformer skeleton, adopting the following technical solutions:

[0006] A transformer skeleton includes: a skeleton body, including a central part and isolation parts; the central part has a jack for inserting a transformer magnetic core; there are multiple isolation parts, and each isolation part surrounds the periphery of the central part, and the multiple isolation parts are spaced apart along the insertion path of the transformer magnetic core on the central part; wherein, a winding slot for winding the primary winding and / or secondary winding coils of the transformer is formed between adjacent isolation parts.

[0007] By adopting the above technical solutions, multiple isolation parts surround the central part, forming multiple winding slots, enabling the primary winding and / or secondary winding coils of the transformer to be wound in layers, improving the stacking method of the coils, enhancing the heat dissipation performance between the coils, improving the problem of shortened life caused by poor heat dissipation of the inner-layer coils, thereby enhancing the overall service life and performance stability of the transformer, and increasing the capacity and efficiency of the transformer.

[0008] Optionally, the transformer skeleton further includes copper sheets. There are multiple copper sheets, and the copper sheets can serve as the primary winding or secondary winding of the transformer, and each isolation part has a copper sheet therein;

[0009] Each copper sheet includes a surrounding part and a lead-out part; the surrounding part is embedded in the isolation part, and the surrounding part simultaneously surrounds the central part; there are two lead-out parts, both of which are connected to the surrounding part, and both lead-out parts extend to the outside of the isolation part, and there is a break between the surrounding part and the two lead-out parts.

[0010] By adopting the above technical solution, the copper sheet is used as the winding and directly embedded in the isolation part, which not only simplifies the coil winding process, but also improves the integration and structural strength of the winding. The surrounding part encloses the central part to improve the concentration of the magnetic field, and the arrangement of the lead-out part facilitates the connection with the external circuit.

[0011] Optionally, at least one of the lead-out parts on the copper sheet is opposite to the lead-out part of the adjacent copper sheet.

[0012] By adopting the above technical solution, at least one lead-out part is opposite to the lead-out part of the adjacent copper sheet, optimizing the connection layout between windings, facilitating subsequent electrical connection and insulation treatment, reducing the wiring complexity and cost, and at the same time being beneficial to improving the overall compactness and aesthetics of the transformer.

[0013] Optionally, all the copper sheets are divided into two groups of copper sheet groups, and the copper sheets in the two groups of copper sheet groups correspond one by one, and the two corresponding copper sheets are mirror-symmetrical along the perpendicular bisector of the axis of the central part;

[0014] Among two adjacent copper sheets in the same copper sheet group, one lead-out part on one copper sheet is opposite to one lead-out part on the other copper sheet, and the other lead-out part on one copper sheet is offset from the other lead-out part on the other copper sheet.

[0015] By adopting the above technical solution, the copper sheets are grouped and arranged in a mirror-symmetrical manner along the perpendicular bisector of the axis of the central part, and the lead-out parts of adjacent copper sheets in the same group are designed to be opposite and offset. This layout method not only balances the electromagnetic force between windings, but also simplifies the connection path, reduces electromagnetic interference, and improves the electromagnetic compatibility and operation stability of the transformer.

[0016] Optionally, the periphery of the isolation part has a notch for exposing the surrounding part.

[0017] By adopting the above technical solution, a notch is provided on the periphery of the isolation part to expose the surrounding part, which is convenient for checking and confirming the embedded position and state of the copper sheet, and at the same time provides convenience for subsequent processing and debugging, improves the maintainability and production efficiency of the transformer, and can improve the heat dissipation capacity of the copper sheet.

[0018] Optionally, a lead wire groove is formed on the periphery of each isolation part, and the lead wire groove is for the wire of the transformer winding coil to abut against.

[0019] By adopting the above technical solution, a lead wire groove is provided on the isolation part, providing a set path for the wire of the transformer winding coil, reducing the situation of wire chaos and crossing, improving the neatness and electrical safety of the winding. And it also helps to reduce the volume and weight of the transformer and improve the space utilization rate.

[0020] Optionally, a wire pressing mechanism opposite to the lead wire groove is provided on the isolation part, and the wire pressing mechanism includes

[0021] a base, arranged on the isolation part and located on one side of the lead wire groove;

[0022] a conveyor belt, conveyed in the base;

[0023] a pressing strip, connected to the conveyor belt, driven by the conveyor belt to move on the base, and capable of moving into the lead wire groove to press the wire of the transformer winding coil; and

[0024] an adjusting member, installed in the base and connected to the conveyor belt, for driving the conveyor belt to convey to adjust the position of the pressing strip.

[0025] By adopting the above technical solution, the pressing strip is driven by the conveyor belt to move into the lead wire groove to press the wire, realizing the pressing of the wire, improving the stability and reliability of the winding. At the same time, the design of the adjusting member enables the wire pressing force to be adjustable, adapting to wires of different specifications and materials, enhancing the applicability and flexibility of the transformer.

[0026] Optionally, the adjusting member includes

[0027] an adjusting shaft, including an adjusting section and a threaded section connected coaxially, the threaded section is threadedly connected in the base along the height direction of the lead wire groove, and a guiding groove is spirally opened on the outer wall of the adjusting section along its own axial direction;

[0028] a connecting piece, connected to the conveyor belt and sleeved on the outer wall of the adjusting section, and a guiding protrusion that abuts into the guiding groove is provided on the inner wall of the connecting piece; and

[0029] a limiting shaft, arranged in the base and parallel to the adjusting shaft, and the connecting piece simultaneously slides axially along the limiting shaft and is sleeved in the limiting shaft.

[0030] By adopting the above technical solution, the precise adjustment of the position of the pressing strip can be realized by rotating the adjusting shaft, with simple operation and accurate positioning.

[0031] Optionally, the skeleton body is integrally injection molded from an insulating material.

[0032] By adopting the above technical solution, the skeleton body is integrally injection molded from an insulating material, improving the insulation performance and overall strength of the skeleton, reducing the number of components and assembly processes, lowering the production cost and cycle. At the same time, the integrally formed design also helps to improve the sealing performance and corrosion resistance of the skeleton, extending the service life of the transformer.

[0033] In summary, the present application includes at least one of the following beneficial effects:

[0034] 1. Through the cooperation of the isolation part and the center part, a multi-layer winding slot is formed, so that the winding coil can be wound in layers, thereby increasing the heat dissipation area, increasing the heat dissipation capacity of the transformer, and improving the problem of shortened life of the inner coil due to poor heat dissipation.

[0035] 2. The copper sheet is pre-buried in the isolation part, which not only simplifies the coil winding process, but also supports the skeleton body, improves the structural strength of the transformer skeleton, and by selecting the number of copper sheets in series and the number of turns of the coil, the output voltage and current can be adjusted according to demand, which is flexibly applicable to a variety of power conversion;

[0036] 3. The wire in the lead slot is pressed by the pressing strip in the wire pressing mechanism to improve the stability and reliability of the winding. Brief Description of the Figures

[0037] Figure 1 is a schematic diagram of the structure of the first embodiment of the present application;

[0038] Figure 2 is a front view of the first embodiment of the present application;

[0039] Figure 3 is a schematic diagram of the explosion structure of a group of copper sheets in an embodiment of the present application;

[0040] Figure 4 is a schematic diagram of the structure of the second embodiment of the present application;

[0041] Figure 5 Yes Figure 4 Schematic diagram of the enlarged structure at A in the middle;

[0042] Figure 6 is a schematic diagram of the structure of the wire pressing mechanism in the second embodiment of the present application;

[0043] Figure 7 is a schematic diagram of the structure of the connecting piece in the second embodiment of the present application.

[0044] Description of the accompanying drawings: 1. skeleton body; 101. center part; 102. isolation part; 2. winding slot; 3. copper sheet; 31. surrounding part; 32. lead-out part; 4. fracture; 5. notch; 6. lead-in slot; 7. wire pressing mechanism; 71. base; 72. conveyor belt; 73. pressing strip; 74. adjusting member; 741. adjusting shaft; 7411. adjusting section; 7412. threaded section; 742. connecting piece; 743. limiting shaft; 8. guide slot; 9. guide convex; 10. first piece; 11. second piece; 12. supporting shaft; 13. giving way slot; 14. jack. Specific implementation method

[0045] ​The following further elaborates on this application in conjunction with the attached drawings. Figures 1 - 7 A further detailed description of this application will be given below.

[0046] Embodiment 1:

[0047] An embodiment of this application discloses a transformer skeleton. Referring to Figure 1 , the transformer skeleton includes a skeleton body 1 and copper sheets 3. The skeleton body 1 is integrally injection-molded from an insulating material, and the copper sheets 3 are embedded in the skeleton body 1 during the injection molding of the skeleton body 1 to be formed together with the skeleton body 1.

[0048] Referring to Figure 1 and Figure 2 , among them, the skeleton body 1 includes a central part 101 and a partition part 102. The central part 101 is cylindrical, and the central part 101 has a jack 14 that axially penetrates through opposite ends of itself along its own axis. When the transformer is assembled, the magnetic core of the transformer is inserted into the jack 14 from both ends of the central part 101 for the assembly of the skeleton and the magnetic core.

[0049] There are multiple partition parts 102. The multiple partition parts 102 are uniformly spaced along the axial direction of the central part 101 and are formed on the outer periphery of the central part 101. The multiple partition parts 102 coincide in the axial direction of the central part 101. Each partition part 102 is an annular sheet with a plate surface perpendicular to the axis of the central part 101, and the partition part 102 surrounds the central part 101, so that a winding slot 2 is formed between each adjacent two partition parts 102 and the outer periphery of the central part 101. Thus, multiple winding slots 2 are distributed in sequence along the axial direction of the central part 101.

[0050] Referring to Figure 1 and Figure 3 , there are multiple copper sheets 3. Each partition part 102 has at least one copper sheet 3. Each copper sheet 3 includes a surrounding part 31 and a lead-out part 32. The surrounding part 31 is arc-shaped. The surrounding part 31 is embedded in the partition part 102, and the surrounding part 31 coaxially surrounds the central part 101. The two ends where the surrounding part 31 starts and ends are close to each other and a break 4 is formed between them to limit the contact between the two ends of the surrounding part 31.

[0051] The lead-out part 32 is sheet-shaped. Each copper sheet 3 has two lead-out parts 32. The two lead-out parts 32 are respectively connected to both ends of the surrounding part 31. At the same time, the two lead-out parts 32 are parallel to each other and both extend downward to the outside of the partition part 102, and the width of the end of the lead-out part 32 far from the partition part 102 is smaller than the width of the end of the lead-out part 32 close to the partition part 102.

[0052] When the transformer is in use, the lead-out part 32 serves as the pin of the transformer and is installed and electrically conducted by plugging or connecting the lead-out part 32 to the PCB board. When the transformer is assembled, the primary winding coil can be wound in all the winding slots 2, and the number of turns of the primary winding can be adjusted by adjusting the number of coil turns. At this time, the copper sheet 3 serves as the secondary winding, and the lead-out parts 32 of different copper sheets 3 are connected to be able to connect the copper sheets 3 in series, and the number of turns of the secondary winding can be adjusted by adjusting the number of series-connected copper sheets 3. When the transformer is assembled, the secondary winding coil can also be wound in all the winding slots 2, and at this time the copper sheet 3 serves as the primary winding. In addition, the primary coil can be wound in a part of the winding slots 2, and the secondary coil can be wound in a part of the winding slots 2, and the lead-out part 32 of the copper sheet 3 serves as the connection point of the winding coil jumper wire to conduct electricity for the coil.

[0053] When performing the winding operation of the winding coil, after the wire of the winding coil is wound into a coil in one winding slot 2, it can be introduced into another winding slot 2 to continue winding, and the isolation part 102 isolates the coils in the two winding slots 2 to reduce heat transfer. At the same time, the isolation part 102 forms heat dissipation surfaces respectively facing the opposite two sides of the two winding slots 2, and each winding slot 2 communicates with the external environment of the skeleton body 1, thereby increasing the heat dissipation area of the transformer and improving the heat dissipation capacity of the transformer.

[0054] Refer to Figure 1 and Figure 2 Furthermore, a notch 5 is formed on the outer periphery of the isolation part 102 to expose the outer periphery of the surrounding part 31. The notch 5 is formed during the injection molding of the skeleton body 1 and is provided with a plurality of notches 5 along the circumferential direction of the isolation part 102 to be able to increase the part of the copper sheet 3 communicating with the external environment and improve the heat dissipation capacity of the copper sheet 3. And the exposed part of the surrounding part 31 is far from the central part 101, so it is not easy to interfere with the winding coil.

[0055] Refer to Figure 1 and Figure 3 Furthermore, at least one lead-out part 32 on the copper sheet 3 is opposite to the lead-out part 32 of the adjacent copper sheet 3 to facilitate the series connection of the lead-out parts 32 of the adjacent copper sheets 3. Specifically, the number of copper sheets 3 is an even number. In this embodiment, all the copper sheets 3 are divided into two groups of copper sheet groups, and the two groups of copper sheet groups are axially distributed along the central part 101, and the number of copper sheets 3 in the two groups of copper sheet groups is the same. The copper sheets 3 in the two groups of copper sheet groups correspond one by one, and the corresponding two copper sheets 3 have the same shape and size, and the corresponding two copper sheets 3 are mirror-symmetrical about the perpendicular bisector of the axis of the central part 101.

[0056] Refer to Figure 3, wherein, in the same copper sheet group, the positions of the lead-out portions 32 on different copper sheets 3 relative to the surrounding portion 31 are all different, the lead-out portions 32 on the copper sheet 3 far from the perpendicular midline of the axis of the central portion 101 are close to one side edge of the isolation portion 102, and the lead-out portions 32 on the copper sheet 3 close to the perpendicular midline of the axis of the central portion 101 are close to the edge of the isolation portion 102 on the other side, so that the lead-out portions 32 of different copper sheets 3 in the same group have misaligned parts.

[0057] Reference Figure 1 and Figure 3 , specifically, taking two adjacent copper sheets 3 in the same copper sheet group as an example, the two copper sheets 3 are defined as the first sheet 10 and the second sheet 11 respectively, one of the lead-out portions 32 on the first sheet 10 and one of the lead-out portions 32 on the second sheet 11 are opposite and overlapped in the axial direction of the center portion 101, and the other lead-out portion 32 on the first sheet 10 and the other lead-out portion 32 on the second sheet 11 are respectively located on both sides of the relative lead-out portion 32, so that the two are misaligned with each other. Therefore, when the adjacent copper sheets 3 are connected in series, the relative lead-out portions 32 on the adjacent copper sheets 3 can be connected, so that the connection between the copper sheets 3 is more convenient and clear. And the isolation portion 102 corresponding to the first sheet 10 does not block the misaligned lead-out portion 32 of the second sheet 11, and the isolation portion 102 corresponding to the second sheet 11 does not block the misaligned lead-out portion 32 of the first sheet 10, so as to provide an operating space when connecting the lead-out portions 32.

[0058] Reference Figure 1 and Figure 2 , further, each isolation part 102 is formed with a lead groove 6 on the top side away from the lead part, and two lead grooves 6 are provided on the top side of the isolation part 102, and the two lead grooves 6 are respectively located on the two sides of the isolation part 102 away from each other. The lead groove 6 is used for the wire of the winding coil to be pressed into when crossing the isolation part 102, so as to improve the stability of the wire and make it difficult for the wire to be randomly displaced when crossing the isolation part 102 to affect the guiding winding effect.

[0059] In this embodiment, there are five isolating parts 102 and six copper sheets 3. Two copper sheets 3 are embedded in the isolating part 102 in the middle, and one copper sheet 3 is embedded in each of the other isolating parts 102. There is a gap between the two copper sheets 3 in the middle isolating part 102 and is filled with insulating material during injection molding to isolate each other. In other embodiments, the isolating parts 102 can also be an odd number such as three or seven, the number of copper sheets 3 is one more than the isolating parts 102, and there are two copper sheets 3 in the isolating part 102 in the middle, and one copper sheet 3 in each of the other isolating parts 102.

[0060] The implementation principle of a transformer skeleton in the embodiment of the present application is as follows: when the transformer skeleton is used, the isolation part 102 isolates the winding coil into a multi-layer structure, the wire of the winding coil crosses the isolation part 102 from the lead groove 6, and the copper sheet 3 is plugged into the PCB board.

[0061] Example 2:

[0062] The difference between the embodiment of the present application and the embodiment 1 is that, refer to Figure 4 , the embodiment of the present application further includes a wire pressing mechanism 7, which is used to press the wire in the lead groove 6.

[0063] Reference Figure 5 and Figure 6 , specifically, the wire pressing mechanism 7 includes a base 71, a conveyor belt 72, a pressing strip 73 and an adjusting member 74. The wire pressing mechanism 7 is assembled before the frame body 1 is injected and placed in the injection mold of the frame body 1, so as to be fixed together with the isolation part 102 during the injection molding of the frame body 1.

[0064] The base 71 is fixed on the isolation part 102 and corresponds to the lead groove 6 one by one. One side of the base 71 serves as the inner side wall of the lead groove 6. The base 71 is hollow inside, and two parallel support shafts 12 are fixed inside the base 71. The axial direction of the support shaft 12 is parallel to the axial direction of the center part 101, and the distribution direction of the two support shafts 12 is parallel to the height direction of the lead groove 6.

[0065] The conveyor belt 72 corresponds to the base 71 one by one. The conveyor belt 72 is located in the inner cavity of the base 71 and is simultaneously sleeved on the two support shafts 12 in the base 71, and can be transmitted on the support shafts 12. The pressing strip 73 is in the shape of a rectangular strip, one end of which is fixed on the conveyor belt 72, and the length extension direction of the pressing strip 73 is perpendicular to the axial direction of the support shaft 12. The base 71 is provided with a clearance groove 13 for the pressing strip 73 to extend and move with the conveyor belt 72, and the clearance groove 13 is connected to the inner cavity of the base 71.

[0066] Reference Figure 5 and Figure 6 , the adjusting member 74 includes an adjusting shaft 741, a connecting piece 742 and a limiting shaft 743. The adjusting shaft 741 is in the shape of a circular shaft, and includes an adjusting section 7411 and a threaded section 7412 that are coaxially fixedly connected. The threaded section 7412 is threadedly connected to the bottom of the base 71 along the distribution direction of the two supporting shafts 12. The adjusting section 7411 is located in the inner cavity of the base 71, and one end of the adjusting section 7411 away from the threaded section 7412 extends to the outside of the base 71 away from the center 101. At the same time, the end of the adjusting section 7411 away from the threaded section 7412 has a handle. The limiting shaft 743 is fixed on the base 71 and is located in the inner cavity of the base 71, and the axis of the limiting shaft 743 is parallel to the axis of the adjusting shaft 741.

[0067] Reference Figure 6 and Figure 7 Figure 7 , the connecting piece 742 is in the shape of a square sheet, the connecting piece 742 is fixed on the conveyor belt 72, and the connecting piece 742 is simultaneously sleeved on the outer wall of the adjusting section 7411 and the outer wall of the limiting shaft 743. The connecting piece 742 can slide on the adjusting section 7411 and the limiting shaft 743 along the direction parallel to the axial direction of the adjusting section 7411, so as to drive the conveyor belt 72 to convey. It should be noted that a guiding protrusion 9 is fixed on the inner wall of the connecting piece 742 opposite to the adjusting section 7411. The guiding protrusion 9 is in the shape of a convex column, and a guiding groove 8 for the guiding protrusion 9 to abut and slide into is formed on the outer peripheral wall of the adjusting section 7411. The guiding groove 8 is spirally formed on the outer peripheral wall of the adjusting section 7411 along the axial direction of the adjusting section 7411, and the pitch of the guiding groove 8 is greater than the pitch of the threaded section 7412.

[0068] Reference Figure 5 、 Figure 6 and Figure 7 Figure 7 , when the guiding protrusion 9 abuts against one end of the guiding groove 8 close to the threaded section 7412, the pressing strip 73 is located outside the lead wire groove 6, and the length extension direction of the pressing strip 73 is parallel to the distribution direction of the two support shafts 12. At this time, the pressing strip 73 does not interfere with the wire in the lead wire groove 6, and the operator can press the wire against the lead wire groove 6. Then, when the adjusting shaft 741 is moved downward in a threaded manner, the guiding protrusion 9 can move upward relative to the adjusting section 7411, so as to drive the connecting piece 742 to move upward, thereby driving the conveyor belt 72 to convey, driving the pressing strip 73 to move into the lead wire groove 6, so that the pressing strip 73 presses down the wire in the lead wire groove 6 to further limit the wire and improve the stability of the wire in the lead wire groove 6.

[0069] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A transformer skeleton, characterized in that: include: A skeleton body (1) comprises a central portion (101) and an isolating portion (102); the central portion (101) has an insertion hole (14) for inserting a transformer core; the isolating portion (102) has a plurality of portions, each of the isolating portions (102) is enclosed around the central portion (101), and the plurality of isolating portions (102) are distributed on the central portion (101) at intervals along the transformer core insertion path; wherein winding slots (2) for winding the primary winding and / or secondary winding coils of the transformer are formed between adjacent isolating portions (102); A lead wire groove (6) is formed on the circumference of each of the isolation portions (102), and the lead wire groove (6) is used for the conductor of the transformer winding coil to enter; The isolation portion (102) is provided with a wire pressing mechanism (7) opposite to the wire guide groove (6), and the wire pressing mechanism (7) comprises A base (71) is arranged on the isolation portion (102) and is located on one side of the lead groove (6); A conveyor belt (72) conveying in the base (71); a pressing bar (73) connected to the conveyor belt (72), driven by the conveyor belt (72) to move on the base (71), and capable of moving into the lead groove (6) to press against the conductor of the transformer winding coil; and an adjusting member (74), installed in the base (71) and connected to the conveyor belt (72), and used for driving the conveyor belt (72) to adjust the position of the pressing strip (73); The adjusting member (74) comprises An adjusting shaft (741) comprises an adjusting section (7411) and a threaded section (7412) which are coaxially connected, wherein the threaded section (7412) is threadedly connected to the base (71) along the height direction of the guide groove (6), and a guide groove (8) is formed on the outer wall of the adjusting section (7411) along its own axial direction in a spiral manner; A connecting piece (742) connected to the conveyor belt (72) and sleeved on the outer wall of the adjusting section (7411), and having a guide protrusion (9) on the inner wall of the connecting piece (742) that presses into the guide groove (8); and A limiting shaft (743) is disposed in the base (71) and is parallel to the adjusting shaft (741), and the connecting piece (742) simultaneously slides axially along the limiting shaft (743) and is sleeved in the limiting shaft (743); Two mutually parallel support shafts (12) are fixed inside the base (71), and the distribution direction of the two support shafts (12) is parallel to the height direction of the guide groove (6). The conveyor belt (72) is located in the inner cavity of the base (71) and is simultaneously sleeved on the two support shafts (12) in the base (71); when the guide protrusion (9) abuts against one end of the guide groove (8) close to the threaded section (7412), the pressure strip (73) is located outside the guide groove (6), and the length extension direction of the pressure strip (73) is parallel to the distribution direction of the two support shafts (12).

2. A transformer skeleton according to claim 1, characterized in that: The transformer skeleton also includes a copper sheet (3), a plurality of the copper sheets (3) are provided, the copper sheets (3) can be used as a primary winding or a secondary winding of the transformer, and each of the isolation parts (102) has the copper sheet (3); Each of the copper sheets (3) comprises a surrounding portion (31) and a lead-out portion (32); the surrounding portion (31) is pre-buried in the isolation portion (102), and the surrounding portion (31) simultaneously surrounds the central portion (101); the lead-out portion (32) has two leads, both connected to the surrounding portion (31), and both of the two lead-out portions (32) extend to the outside of the isolation portion (102), and a partitioning fracture (4) is provided between the surrounding portion (31) and the two lead-out portions (32).

3. A transformer skeleton according to claim 2, characterized in that: At least one lead-out portion (32) on the copper sheet (3) is opposite to the lead-out portion (32) of an adjacent copper sheet (3).

4. A transformer skeleton according to claim 3, characterized in that: All the copper sheets (3) are divided into two groups of copper sheets (3), the copper sheets (3) in the two groups of copper sheets (3) correspond to each other one by one, and the two corresponding copper sheets (3) are mirror-symmetrical along the perpendicular midline of the axis of the central part (101); In two adjacent copper sheets (3) of the same copper sheet (3) group, one lead-out portion (32) on one of the copper sheets (3) is opposite to one lead-out portion (32) on the other copper sheet (3), and another lead-out portion (32) on one of the copper sheets (3) is offset from another lead-out portion (32) on the other copper sheet (3).

5. A transformer skeleton according to claim 2, characterized in that: The peripheral side of the isolation portion (102) has a notch (5) for exposing the surrounding portion (31).

6. A transformer skeleton according to claim 1, characterized in that: The skeleton body (1) is integrally injection-molded from insulating material.

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