High-energy-efficiency transformer iron core

Abstract

The invention discloses a high-energy-efficiency transformer iron core, which relates to the technical field of transformer iron cores, and further comprises edge laminations, central laminations and transverse laminations which are arranged in a fixed frame. By arranging the edge laminations, the central laminations and the transverse laminations, the edge laminations, the central laminations and the transverse laminations form the iron core of a structure shaped like a Chinese character'ri ', the flow guide grooves are formed in the edge laminations and the central laminations, the flow passing grooves are formed in the transverse laminations, and the flow passing grooves are matched with the flow guide grooves, so that flow guide of heat-conducting oil in the iron core can be realized; flow guide strips are arranged on one sides of the edge laminations and the central laminations, the flow guide strips can be inserted into the flow passing grooves, and the flow guide grooves are connected with the flow passing grooves in an inserted mode, so that heat dissipation of the interior of the iron core is achieved, and overheating deformation of the iron core can be avoided. The overlapping stability between the multiple sets of edge laminations and the central laminations is improved, and meanwhile the heat exchange efficiency between the edge laminations and the heat conduction oil can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer cores, and particularly relates to a high-efficiency transformer core. Background Art

[0002] A transformer generally consists of a core and several coil windings. The coil windings are wound around the core. After one winding is connected to a power supply, an induced current and an induced voltage are generated in other windings through the core. By adjusting the turns ratio of the windings, the voltage ratio of each winding can be changed, that is, voltage transformation is achieved.

[0003] In the prior art, in order to reduce the generation of eddy currents, the core type core of a transformer adopts a laminated structure, and the stacked iron sheets are insulated from each other (coated with insulating paint or separated by insulating gaskets). When the transformer is working, certain eddy currents will still be generated in the core and cause heating, and the windings themselves will also heat up due to the resistance thermal effect. When the continuously generated heat cannot be dissipated in time, it will cause the temperature of the transformer to rise, resulting in an increase in the resistance value of the windings and further increasing the heat generation, forming a vicious cycle. There is no special heat dissipation measure for the core in the prior art, and usually, heat dissipation is achieved by the contact between the core and the air, with low heat dissipation efficiency.

[0004] For example, a transformer core for facilitating heat dissipation with the publication number of CN116666063B. It includes a U-shaped laminated sheet, a one-shaped laminated sheet, and a guiding heat dissipation plate; the one-shaped laminated sheet has an extension portion extending to the right on the right side of the U-shaped laminated sheet; the guiding heat dissipation plate is obliquely fixed between the extension portions of the odd layers and the extension portions of the even layers. The guiding heat dissipation plate is composed of a plurality of guiding heat dissipation strips, the guiding heat dissipation strips are arranged in the front-rear direction, and each guiding heat dissipation strip is spaced apart in the left-right direction and also spaced apart in the up-down direction; one end of the guiding heat dissipation strip of the odd layer is clamped between the two extension portions of the adjacent even layers, and the other end of the guiding heat dissipation strip of the odd layer is in contact connection or fixed connection with the extension portion of the same layer; one end of the guiding heat dissipation strip of the even layer is clamped between the two extension portions of the adjacent odd layers, and the other end of the guiding heat dissipation strip of the even layer is in contact connection or fixed connection with the extension portion of the same layer. It can improve the heat dissipation efficiency of the core.

[0005] The above technical solution has some problems in practical applications. This technical solution completes the assembly of the core by laminating. However, during the operation of the transformer, its heat is generated from the inside out, and the internal heat is difficult to quickly discharge, easily causing the core to overheat and deform, affecting the normal use of the transformer.

[0006] Therefore, it is very necessary to invent a high-efficiency transformer core to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a high-efficiency transformer core to solve the problems raised in the above background art.

[0008] To achieve the above object, the present invention provides the following technical solution: a high-efficiency transformer core, comprising a fixing frame, and also comprising edge laminations, central laminations and transverse laminations installed inside the fixing frame, wherein a plurality of edge laminations, central laminations and transverse laminations are provided, and the plurality of edge laminations, central laminations and transverse laminations are stacked in sequence; The fixing frame is used to fix a plurality of edge laminations, a central lamination and a transverse lamination, and the fixing frame includes four brackets, a support screw is fixedly installed between two adjacent brackets, and a guide assembly for the flow of heat transfer oil is installed between the four brackets; The edge laminations are provided in two groups, and the two groups of edge laminations are symmetrically arranged, the central lamination is installed between the two groups of edge laminations, the transverse laminations are provided in two groups, and the two groups of transverse laminations are respectively installed at both ends of the central lamination, the edge laminations, the central laminations and the transverse laminations form a "sun" shape structure, and a splicing structure and a heat dissipation structure are arranged between the edge laminations, the central laminations and the transverse laminations.

[0009] Preferably, the splicing structure is used to improve the splicing stability between the edge laminations, the central laminations and the transverse laminations, and the splicing structure includes a beveled edge, a tapered edge, a tapered groove and an oblique groove, the beveled edge is arranged at both ends of the edge lamination, the tapered edge is arranged at both ends of the central lamination, the tapered groove is opened in the inner middle part of the transverse lamination, and the tapered groove corresponds to the tapered edge, and the oblique groove is opened at both ends of the transverse lamination, and the oblique groove corresponds to the beveled edge.

[0010] Preferably, an oblique block is fixedly provided on the outer side wall of the oblique edge, and the oblique block is overlapped and installed at the notch of the oblique groove, and conical blocks are fixedly provided on both sides of the conical edge, and the conical blocks are overlapped and installed at the notch of the conical groove.

[0011] Preferably, the heat dissipation structure is used to guide the heat transfer oil to flow between the edge laminations, the central laminations and the transverse laminations to discharge heat, and the heat dissipation structure includes a guide groove, a guide strip and a flow groove, the guide groove is opened in the middle of the edge lamination and the central lamination, the flow groove is opened in the middle of the transverse lamination, and one end of the flow groove is connected to the guide groove, the guide strip is fixedly installed on one side of the edge lamination and the central lamination, and the guide strip is plugged into the inside of the guide groove.

[0012] Preferably, the guide bar is configured as a "U"-shaped structure, and heat-conducting fins are fixedly mounted on inner walls on both sides of the guide bar, the heat-conducting fins are configured as a corrugated structure, and the cross-section of the heat-conducting fins is configured as an inclined structure.

[0013] Preferably, the heat dissipation structure also includes a connecting groove, an extension groove and a connecting ring, the connecting groove is opened at one side end of the transverse stack, and the connecting groove is connected to the flow groove, the extension groove is opened at the bottom of the connecting groove, and the extension groove is configured as a funnel-shaped structure, the connecting ring is fixedly installed at the other side end of the transverse stack, and the connecting ring corresponds to the connecting groove.

[0014] Preferably, a notch is formed through the outer side of the connecting ring, and the position of the notch corresponds to the flow groove.

[0015] Preferably, the flow guide assembly includes an annular seat, a connecting cover and a connecting pipe, the annular seat is fixedly installed at both ends of the outer side of the bracket, and the annular seat corresponds to the connecting ring, the connecting cover is fixedly installed on the outer side of the annular seat at one end of the bracket, and the connecting covers on the outer sides of two adjacent brackets are staggered, the connecting pipe is fixedly installed between two adjacent connecting covers, and the connecting pipe and the connecting cover are used to realize the connection of the heat transfer oil channel between the two brackets.

[0016] Preferably, the flow guide assembly also includes a fixed cover and an oil guide pipe, the fixed cover is fixedly installed on the outside of the annular seat, and the fixed cover and the connecting cover are staggered, the oil guide pipe is fixedly installed on the outside of the fixed cover, and the oil guide pipe and the fixed cover are used to realize the input and output of heat transfer oil.

[0017] Preferably, the edge laminations, the central laminations and the transverse laminations located outside the heat dissipation core have decreasing widths.

[0018] Technical effects and advantages of the present invention: 1. The present invention provides edge laminations, central laminations and transverse laminations, which form a core with a "sun"-shaped structure. Guide grooves are provided on the edge laminations and the central laminations, and flow grooves are provided on the transverse laminations. The flow grooves cooperate with the guide grooves to guide the flow of heat transfer oil inside the core, so as to dissipate heat inside the core, thereby avoiding overheating and deformation of the core. At the same time, guide strips are provided on one side of the edge laminations and the central laminations, and the guide strips can be inserted into the flow grooves. The plug-in arrangement of the guide grooves and the flow grooves can improve the stacking stability between multiple groups of edge laminations and the central laminations, and at the same time increase the heat exchange efficiency between them and the heat transfer oil, thereby further improving the heat dissipation efficiency of the core. 2. The present invention provides beveled edges and beveled blocks at both ends of the edge laminations, provides tapered edges and tapered blocks at both ends of the central laminations, and provides tapered grooves and beveled grooves at the middle and both ends of the transverse laminations, respectively. The tapered grooves can cooperate with the tapered edges and tapered blocks, and the beveled grooves can cooperate with the beveled edges and beveled blocks, so as to improve the stability of the edge laminations, the central laminations and the transverse laminations after lamination, thereby improving the stability of the core in use and limiting the deformation range of the core when it is overheated; 3. The present invention sets a fixing frame, which includes four brackets for fixing edge laminations, central laminations and transverse laminations. By setting connecting pipes between the four brackets, the connecting pipes can realize the connection of the heat transfer oil channels between two adjacent brackets, so as to improve the flow range of the heat transfer oil between the edge laminations, central laminations and transverse laminations, thereby improving the heat exchange efficiency between the heat transfer oil and the iron core, thereby improving the heat dissipation effect of the iron core. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the edge lamination, central lamination and transverse lamination structure of the present invention.

[0021] Figure 3 It is a schematic diagram of the combination of the edge lamination, the central lamination and the transverse lamination structure of the present invention.

[0022] Figure 4 It is a bottom view of the edge lamination, central lamination and transverse lamination structure combination of the present invention.

[0023] Figure 5 It is a schematic diagram of the scattered structure of the edge laminations, the central laminations and the transverse laminations of the present invention.

[0024] Figure 6 It is a schematic diagram of the central lamination structure of the present invention.

[0025] Figure 7 It is a schematic diagram of the edge lamination structure of the present invention.

[0026] Figure 8 It is a schematic diagram of the transverse lamination structure of the present invention.

[0027] Fig. 9 It is a side schematic diagram of the transverse lamination structure of the present invention.

[0028] Fig.10 It is a schematic diagram of the fixing frame structure of the present invention.

[0029] Fig.11 It is a schematic diagram of the support structure of the present invention.

[0030] In the figure: 1, fixing frame; 2, edge lamination; 3, central lamination; 4, transverse lamination; 11, bracket; 12, support screw; 13, annular seat; 14, connecting cover; 15, connecting pipe; 16, fixing cover; 17, oil guide pipe; 21, bevel edge; 22, bevel block; 23, guide groove; 31, tapered edge; 32, tapered block; 33, guide strip; 331, thermal fin; 41, tapered groove; 42, bevel groove; 43, flow groove; 44, connecting groove; 441, extension groove; 442, connecting ring; 443, notch. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention provides Figures 1 to 11 A high-efficiency transformer core shown in the figure includes a fixing frame 1, and also includes edge laminations 2, central laminations 3 and transverse laminations 4 installed inside the fixing frame 1, wherein a plurality of edge laminations 2, central laminations 3 and transverse laminations 4 are provided, and the plurality of edge laminations 2, central laminations 3 and transverse laminations 4 are stacked in sequence; The edge laminations 2, the central laminations 3 and the transverse laminations 4 located outside the heat dissipation core have decreasing widths; The fixing frame 1 is used to fix a plurality of edge laminations 2, a central lamination 3 and a transverse lamination 4. The fixing frame 1 comprises four brackets 11. A support screw 12 is fixedly installed between two adjacent brackets 11. A guide assembly for the flow of heat transfer oil is installed between the four brackets 11. Two groups of edge laminations 2 are provided, and the two groups of edge laminations 2 are symmetrically arranged, the central lamination 3 is installed between the two groups of edge laminations 2, and two groups of transverse laminations 4 are provided, and the two groups of transverse laminations 4 are installed at both ends of the central lamination 3 respectively. The edge laminations 2, the central laminations 3 and the transverse laminations 4 form a "sun" shape structure, and a splicing structure and a heat dissipation structure are provided between the edge laminations 2, the central laminations 3 and the transverse laminations 4; The splicing structure is used to improve the splicing stability between the edge laminations 2, the central laminations 3 and the transverse laminations 4. The splicing structure includes a bevel 21, a tapered edge 31, a tapered groove 41 and an oblique groove 42. The bevel 21 is arranged at both ends of the edge lamination 2, the tapered edge 31 is arranged at both ends of the central lamination 3, the tapered groove 41 is opened in the inner middle part of the transverse lamination 4, and the tapered groove 41 corresponds to the tapered edge 31, and the oblique groove 42 is opened at both ends of the transverse lamination 4, and the oblique groove 42 corresponds to the bevel 21. In addition, an oblique block 22 is fixedly provided on the outer side wall of the oblique edge 21, and the oblique block 22 is overlapped and installed at the notch of the oblique groove 42, and conical blocks 32 are fixedly provided on both sides of the conical edge 31, and the conical blocks 32 are overlapped and installed at the notch of the conical groove 41; The heat dissipation structure is used to guide the heat transfer oil to flow between the edge laminations 2, the central laminations 3 and the transverse laminations 4 to discharge heat. The heat dissipation structure includes a guide groove 23, a guide bar 33 and a flow groove 43. The guide groove 23 is opened in the middle of the edge laminations 2 and the central laminations 3. The flow groove 43 is opened in the middle of the transverse laminations 4, and one end of the flow groove 43 is connected to the guide groove 23. The guide bar 33 is fixedly installed on one side of the edge laminations 2 and the central laminations 3, and the guide bar 33 is plugged and installed inside the guide groove 23. The guide bar 33 cooperates with the guide groove 23 to improve the stability of multiple edge laminations 2 and the central laminations 3 after being stacked. Furthermore, the guide bar 33 is configured as a "U"-shaped structure, and the inner walls on both sides of the guide bar 33 are fixedly mounted with heat-conducting fins 331, the heat-conducting fins 331 are configured as a corrugated structure, and the cross-section of the heat-conducting fins 331 is configured as an inclined structure. The design of the corrugated structure and the inclined structure can increase the contact area between the heat-conducting fins 331 and the heat-conducting oil, thereby increasing the heat exchange efficiency between the iron core and the heat-conducting oil. The heat dissipation structure further includes a connecting groove 44, an extension groove 441 and a connecting ring 442. The connecting groove 44 is opened at one end of the transverse laminate 4, and the connecting groove 44 is connected to the flow groove 43. The extension groove 441 is opened at the groove bottom of the connecting groove 44, and the extension groove 441 is set as a funnel-shaped structure. The connecting ring 442 is fixedly installed at the other end of the transverse laminate 4, and the connecting ring 442 corresponds to the connecting groove 44. The setting of the connecting ring 442 can improve the stacking stability between two adjacent transverse laminates 4. In addition, a notch 443 is formed through the outer side of the connecting ring 442, and the position of the notch 443 corresponds to the flow groove 43. The setting of the notch 443 can ensure that the heat transfer oil passes through the flow groove 43 and enters the connecting ring 442. The flow guide assembly includes an annular seat 13, a connecting cover 14 and a connecting pipe 15. The annular seat 13 is fixedly installed at both ends of the outer side of the bracket 11, and the annular seat 13 corresponds to the connecting ring 442. The connecting cover 14 is fixedly installed on the outer side of the annular seat 13 at one end of the bracket 11, and the connecting covers 14 on the outer sides of two adjacent brackets 11 are staggered. The connecting pipe 15 is fixedly installed between two adjacent connecting covers 14. The connecting pipe 15 and the connecting cover 14 are used to realize the connection of the heat transfer oil channel between the two brackets 11. The connecting pipe 15 and the connecting cover 14 can realize the flow of the heat transfer oil between the two transverse laminations 4, thereby improving the circulation range of the heat transfer oil, so as to achieve the purpose of improving the heat dissipation efficiency of the core; The flow guide assembly also includes a fixed cover 16 and an oil guide pipe 17. The fixed cover 16 is fixedly installed on the outer side of the annular seat 13, and the fixed cover 16 and the connecting cover 14 are staggered. The oil guide pipe 17 is fixedly installed on the outer side of the fixed cover 16. The oil guide pipe 17 and the fixed cover 16 are used to realize the input and output of the heat transfer oil. The oil guide pipe 17 can be connected to the circulation pipeline of the heat transfer oil to realize the driving of the heat transfer oil.

[0033] In summary, in the actual application of the device, a plurality of edge laminations 2, a central lamination 3 and a transverse lamination 4 are stacked in sequence to form a core with a "sun" shaped structure. After stacking, the plurality of edge laminations 2, the central lamination 3 and the transverse lamination 4 are fixed by a fixing frame 1. After the assembly is completed, the core is installed inside the transformer and immersed in the heat transfer oil. During the operation of the transformer core, the heat-conducting oil enters the annular seat 13 through the oil guide pipe 17 and the fixed cover 16 on the outside of the bracket 11, and then enters the connecting groove 44 at one end of the transverse lamination 4. At this time, the heat-conducting oil is divided into two parts in the connecting groove 44. One part of the heat-conducting oil continues to flow along the connecting groove 44 to diffuse between multiple transverse laminations 4, and the other part of the heat-conducting oil enters the guide groove 23 along the flow groove 43, and absorbs heat from the edge laminations 2 and the central lamination 3 through the guide strip 33 and the heat-conducting fin 331. After absorbing the heat, the heat-conducting oil is discharged from the connecting groove 44 at the other end of the transverse lamination 4 after being guided by the flow groove 43, so as to bring out the heat in the core. During the circulation of the heat-conducting oil inside the core, the heat-conducting oil can flow between the two transverse laminations 4 through the connecting pipe 15, thereby increasing the circulation range of the heat-conducting oil to achieve the purpose of improving the heat dissipation efficiency of the core. When the core is assembled, the edge laminations 2 are overlapped with the transverse laminations 4 through the inclined blocks 22 and the inclined grooves 42, and the central laminations 3 are overlapped with the transverse laminations 4 through the tapered blocks 32 and the tapered grooves 41, and multiple groups of edge laminations 2, central laminations 3 and transverse laminations 4 are overlapped with each other. The overlapped edge laminations 2, central laminations 3 and transverse laminations 4 can be pressed against each other, so that the overlap stability between the inclined blocks 22 and the inclined grooves 42, and between the tapered blocks 32 and the tapered grooves 41 is improved, thereby improving the deformation resistance of the core, and then improving the stability of the core during operation.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high energy efficiency transformer core, characterized in that: It comprises a fixing frame (1), and also comprises edge stacks (2), central stacks (3) and transverse stacks (4) installed inside the fixing frame (1), wherein a plurality of the edge stacks (2), central stacks (3) and transverse stacks (4) are provided, and the plurality of edge stacks (2), central stacks (3) and transverse stacks (4) are stacked in sequence; The fixing frame (1) is used to fix a plurality of edge stacks (2), a central stack (3) and a transverse stack (4), the fixing frame (1) comprising four brackets (11), a support screw (12) being fixedly installed between two adjacent brackets (11), and a flow guide assembly for the flow of heat transfer oil being installed between the four brackets (11); The edge stacking sheets (2) are provided in two groups, and the two groups of edge stacking sheets (2) are symmetrically arranged. The central stacking sheets (3) are installed between the two groups of edge stacking sheets (2). The transverse stacking sheets (4) are provided in two groups, and the two groups of transverse stacking sheets (4) are installed at two ends of the central stacking sheets (3) respectively. The edge stacking sheets (2), the central stacking sheets (3) and the transverse stacking sheets (4) form a "sun"-shaped structure. A splicing structure and a heat dissipation structure are provided between the edge stacking sheets (2), the central stacking sheets (3) and the transverse stacking sheets (4).

2. The high energy efficiency transformer core according to claim 1, characterized in that: The splicing structure is used to improve the splicing stability between the edge laminations (2), the central laminations (3) and the transverse laminations (4), and the splicing structure comprises a bevel (21), a tapered edge (31), a tapered groove (41) and an oblique groove (42), wherein the bevel (21) is arranged at both ends of the edge lamination (2), the tapered edge (31) is arranged at both ends of the central lamination (3), the tapered groove (41) is opened at the inner middle part of the transverse lamination (4), and the tapered groove (41) corresponds to the tapered edge (31), and the oblique groove (42) is opened at both ends of the transverse lamination (4), and the oblique groove (42) corresponds to the bevel (21).

3. The high energy efficiency transformer core according to claim 2, characterized in that: An oblique block (22) is fixedly provided on the outer side wall of the oblique edge (21), and the oblique block (22) is overlapped and installed at the notch of the oblique groove (42). Conical blocks (32) are fixedly provided on both sides of the conical edge (31), and the conical blocks (32) are overlapped and installed at the notch of the conical groove (41).

4. The high energy efficiency transformer core according to claim 1, characterized in that: The heat dissipation structure is used to guide the heat transfer oil to flow between the edge laminations (2), the central laminations (3) and the transverse laminations (4) to discharge heat. The heat dissipation structure comprises a guide groove (23), a guide bar (33) and a flow groove (43). The guide groove (23) is opened in the middle of the edge laminations (2) and the central laminations (3). The flow groove (43) is opened in the middle of the transverse laminations (4). One end of the flow groove (43) is connected to the guide groove (23). The guide bar (33) is fixedly installed on one side of the edge laminations (2) and the central laminations (3). The guide bar (33) is plugged and installed inside the guide groove (23).

5. The high energy efficiency transformer core according to claim 4, characterized in that: The guide bar (33) is configured as a "U"-shaped structure, and heat-conducting fins (331) are fixedly mounted on the inner walls on both sides of the guide bar (33), the heat-conducting fins (331) are configured as a corrugated structure, and the cross-section of the heat-conducting fins (331) is configured as an inclined structure.

6. The high energy efficiency transformer core according to claim 4, characterized in that: The heat dissipation structure further comprises a connecting groove (44), an extension groove (441) and a connecting ring (442); the connecting groove (44) is opened at one end of the transverse laminate (4), and the connecting groove (44) is connected to the flow groove (43); the extension groove (441) is opened at the groove bottom of the connecting groove (44), and the extension groove (441) is configured as a funnel-shaped structure; the connecting ring (442) is fixedly mounted at the other end of the transverse laminate (4), and the connecting ring (442) corresponds to the connecting groove (44).

7. The high energy efficiency transformer core according to claim 6, characterized in that: A notch (443) is formed through the outer side of the connecting ring (442), and the position of the notch (443) corresponds to the flow groove (43).

8. The high energy efficiency transformer core according to claim 6, characterized in that: The flow guide assembly comprises an annular seat (13), a connecting cover (14) and a connecting pipe (15); the annular seat (13) is fixedly mounted on both ends of the outer side of the bracket (11), and the annular seat (13) corresponds to the connecting ring (442); the connecting cover (14) is fixedly mounted on the outer side of the annular seat (13) at one end of the bracket (11), and the connecting covers (14) on the outer sides of two adjacent brackets (11) are arranged in a staggered manner; the connecting pipe (15) is fixedly mounted between two adjacent connecting covers (14); the connecting pipe (15) and the connecting cover (14) are used to realize the communication of the heat transfer oil channel between the two brackets (11).

9. The high energy efficiency transformer core according to claim 8, characterized in that: The flow guide assembly further comprises a fixed cover (16) and an oil guide pipe (17); the fixed cover (16) is fixedly mounted on the outside of the annular seat (13), and the fixed cover (16) and the connecting cover (14) are arranged in a staggered manner; the oil guide pipe (17) is fixedly mounted on the outside of the fixed cover (16); and the oil guide pipe (17) and the fixed cover (16) are used to realize the input and output of heat transfer oil.

10. The high energy efficiency transformer core according to claim 1, characterized in that: The edge laminations (2), the central laminations (3) and the transverse laminations (4) located outside the heat dissipation core have decreasing widths.

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