Single-frame core, transformer core and transformer

Abstract

The present application relates to a single frame core, a transformer core and a transformer, the single frame core comprising an inner core frame and an outer core frame sleeved outside the inner core frame, the inner core frame comprising a plurality of core cakes stacked along a first direction, and the outer core frame being made by simultaneously winding a second strip on the radial outer circumferential surface of at least some of the plurality of core cakes. The single frame core is divided into two parts, i.e. an inner part and an outer part. By winding the second strip on the inner core frame, the internal structure of the outer circumference of the single frame core can be changed, so that the outer circumferential side of the single frame core is more continuous and complete in the thickness direction (i.e. the width direction of the second strip), rather than being discontinuous in the thickness direction due to the stacking of the plurality of core cakes as in the conventional single frame core. Thus, the strength of the outer circumference of the single frame core is improved, the outer circumference of the single frame core is prevented from being damaged, and the reliability of the transformer core is improved.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to single-frame iron cores, transformer iron cores, and transformers. Background Technology

[0002] Transformers are fundamental equipment for power transmission and distribution, widely used in industry, agriculture, transportation, and urban communities. A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are coils and an iron core (magnetic core). Its main functions include voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformers). The iron core is a crucial component of a transformer. Some iron cores are made by first winding amorphous ribbon into a core disc, and then stacking multiple layers of these discs. However, amorphous ribbon itself has low strength, resulting in a core with low outer perimeter strength after winding and stacking, making it prone to damage. Summary of the Invention

[0003] Therefore, it is necessary to address the problem of low peripheral strength of single-frame cores in stacked amorphous alloy three-phase solid cores by providing a single-frame core, a transformer core, and a transformer.

[0004] A single-frame iron core includes an inner iron core frame and an outer iron core frame sleeved outside the inner iron core frame. The inner iron core frame includes a plurality of iron core discs stacked on top of each other along a first direction. The outer iron core frame is formed by simultaneously winding a second strip around the radial outer circumference of at least a portion of the iron core discs in the inner frame iron core.

[0005] The aforementioned single-frame iron core is divided into inner and outer parts. By winding a second strip around the inner iron core frame, the internal structure of the outer periphery of the single-frame iron core can be changed, making the outer periphery of the single-frame iron core more continuous and complete in the thickness direction (i.e., in the width direction of the second strip). Unlike the stacked single-frame iron core, the outer periphery of the single-frame iron core will be broken in the thickness direction due to the stacking of multiple iron core discs. This improves the strength of the outer periphery of the single-frame iron core, prevents damage to the outer periphery of the single-frame iron core, and improves the reliability of the transformer iron core.

[0006] In one embodiment, each core disc is made by winding a first strip around an axis parallel to the first direction. Thus, the radial dimension of the core disc is proportional to the number of turns of the first strip. When manufacturing large transformers, increasing the number of turns of the first strip allows for the production of larger core discs and single-frame cores, making the manufacture of large transformers more convenient.

[0007] In one embodiment, the inner core frame has an inner peripheral surface and a first outer peripheral surface sleeved outside the inner peripheral surface, at least a portion of the first outer peripheral surface being a straight outer peripheral surface, and the second strip in the outer core frame is wound around the straight outer peripheral surface.

[0008] In one embodiment, the inner core frame includes a first sub-frame, the first sub-frame including a plurality of core discs with radially flush outer peripheral surfaces, such that the radially flush outer peripheral surfaces of the first sub-frame are formed into the flat outer peripheral surfaces.

[0009] In one embodiment, the inner core frame further includes a second sub-frame, the first sub-frame and the second sub-frame are stacked along the first direction, and the second sub-frame includes a plurality of core discs arranged in a stepped radial outer peripheral surface, so that the radial outer peripheral surface of the second sub-frame is formed into a stepped outer peripheral surface;

[0010] The outer core frame includes a first sub-outer peripheral surface and a second sub-outer peripheral surface that are set at an angle and are both stepped. The stepped outer peripheral surface is in contact with the first sub-outer peripheral surface to form a mating surface, and the inner peripheral surface is in contact with the second sub-outer peripheral surface to form a semi-circular surface of the core column.

[0011] In one embodiment, in the direction from the first sub-frame to the second sub-frame, the outer diameter of the plurality of iron core discs within the second sub-frame gradually decreases;

[0012] In the direction from the inner core frame to the outer core frame, the width of the second strip gradually decreases.

[0013] In one embodiment, the single-frame core further includes an encapsulation layer, which is coated and cured on the inner core frame and the outer core frame.

[0014] A transformer core, wherein the three-phase three-dimensional core comprises a plurality of single-frame cores as described in any one of claims 1-7, wherein the plurality of single-frame cores are spliced ​​together, and a core column is formed at the splicing point of each two adjacent single-frame cores.

[0015] In one embodiment, the number of single-frame iron cores is three, each single-frame iron core has a window, the three single-frame iron cores are connected end to end around a second direction perpendicular to the first direction, and a hollow cavity is formed between the three single-frame iron cores that communicates with each of the windows and extends along the second direction.

[0016] A transformer includes a body, the body comprising a coil and a transformer core, the coil being wound around the core post of the transformer core. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a transformer core in one embodiment of the present invention;

[0018] Figure 2 for Figure 1 The diagram shows the structure of a single-frame core in a transformer core.

[0019] Figure 3 for Figure 2 The diagram shows the structure of the inner core frame in a single-frame iron core.

[0020] Figure 4 for Figure 3 The diagram shows the structure of the core disc within the inner core frame.

[0021] Labeling Explanation: 200, Transformer core; 201, Hollow cavity; 100, Single-frame core; 10, Inner core frame; 11, Core disc; 12, Inner circumferential surface; 14, First outer circumferential surface; 141, Straight outer circumferential surface; 143, Stepped outer circumferential surface; 13, First strip; 15, First sub-frame; 17, Second sub-frame; 18, Mating surface; 19, Half-circumferential surface; 20, Window; 30, Outer core frame; 31, Second strip; 32, First sub-outer circumferential surface; 34, Second sub-outer circumferential surface; 50, Core column. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] See Figures 1-3 In one embodiment of the present invention, a single-frame iron core 100 is provided. The single-frame iron core 100 includes an inner iron core frame 10 and an outer iron core frame 30 sleeved outside the inner iron core frame 10. The inner iron core frame 10 includes a plurality of iron core discs 11 stacked on top of each other along a first direction. The outer iron core frame 30 is formed by simultaneously winding a second strip 31 around the radial outer peripheral surface of at least a portion of the iron core discs 11 in the inner frame iron core 10. This is equivalent to dividing the single-frame core 100 into inner and outer parts. By winding the second strip 31 around the inner core frame 10, the internal structure of the outer periphery of the single-frame core 100 can be changed, making the outer periphery of the single-frame core 100 more continuous and complete in the thickness direction (i.e., the width direction of the second strip 31). Unlike the stacked single-frame core, the outer periphery is not broken in the thickness direction due to the stacking of multiple core discs 11, thereby improving the strength of the outer periphery of the single-frame core 100, preventing damage to the outer periphery of the single-frame core 100, and improving the reliability of the transformer core 200.

[0029] Furthermore, due to the limited width of amorphous alloy strips, it is difficult to manufacture large-size amorphous alloy transformer cores (200mm), which in turn makes the manufacture of large transformers difficult. (See also...) Figure 1 and Figure 4 To address this issue, in the single-frame core 100 provided in this embodiment, each core disc 11 within the inner core frame 10 is made by winding a first strip 13 around an axis parallel to the first direction. Thus, the radial dimension of the core disc 11 is proportional to the number of turns of the first strip 13. When manufacturing large transformers, increasing the number of turns of the first strip 13 allows for the preparation of larger core discs 11 and single-frame cores 100, making the manufacture of large transformers simpler and more convenient.

[0030] Optionally, the first strip 13 is an amorphous alloy strip, such as an iron-based amorphous alloy strip, which has excellent properties in terms of high saturation magnetic induction, permeability, excitation current, and iron loss. Furthermore, the width of the first strip 13 is 10mm-150mm, which can be selected according to the actual core design; the thickness of the first strip 13 is 0.01mm-0.03mm, which can also be selected according to the actual core design. Alternatively, the second strip 31 is a silicon steel strip or an amorphous alloy strip.

[0031] See Figures 1-3 In some embodiments, the inner core frame 10 has an inner peripheral surface 12 and a first outer peripheral surface 14 sleeved outside the inner peripheral surface 12. At least a portion of the first outer peripheral surface 14 is a straight outer peripheral surface 141, and the outer core frame 30 is sleeved outside the straight outer peripheral surface 141. The straight outer peripheral surface 141 is formed by a plurality of planes arranged around a first direction and intersecting end-to-end. Thus, the straight outer peripheral surface 141 of the inner core frame 10 includes a plurality of planes. When manufacturing the outer core frame 30, the second strip 31 is wound along the straight outer peripheral surface 141, allowing the second strip 31 to fit tightly against the straight outer peripheral surface 141, ensuring a reliable combination of the outer core frame 30 and the inner core frame 10. This prevents gaps between the inner core frame 10 and the outer core frame 30 from affecting the overall performance of the single-frame core 100.

[0032] Furthermore, the inner core frame 10 includes a first sub-frame 15, which includes multiple core discs 11 with their radially outer peripheral surfaces flush, so that the radially outer peripheral surfaces within the first sub-frame 15 are formed into straight outer peripheral surfaces 141, facilitating the winding of the second strip 31. Specifically, the second strip 31 in the second frame is simultaneously wound around the radially outer peripheral surfaces of all the core discs 11 in the first sub-frame 15, so that it fits into the outer core frame 30 through the straight outer peripheral surfaces 141 formed by the first sub-frame 15.

[0033] Furthermore, the inner core frame 10 also includes a second sub-frame 17. The first sub-frame 15 and the second sub-frame 17 are stacked along a first direction, and the second sub-frame 17 includes a plurality of core discs 11 arranged in a stepped radial outer peripheral surface, so that the radial outer peripheral surface of the second sub-frame 17 is formed into a stepped outer peripheral surface 143. In addition, the outer core frame 30 includes a first sub-outer peripheral surface 32 and a second sub-outer peripheral surface 34 arranged at an angle and both being stepped. The stepped outer peripheral surface 143 abuts with the first sub-outer peripheral surface 32 to form a mating surface 18, and the inner peripheral surface 12 abuts with the second sub-outer peripheral surface 34 to form a semi-circular surface 19 of the core column 50. Thus, each single-frame core 100 has a mating surface 18 and a semi-circular surface 19. When assembling the transformer core 200, the mating surfaces 18 of two adjacent single-frame cores 100 are joined together, which in turn causes the two semi-circular surfaces 19 of two adjacent single-frame cores 100 to join together to form the outer circumference of the entire core column 50. The core column 50 is formed at the joint of two adjacent cores. Optionally, the cross-section of the core column 50 is approximately elliptical or circular to facilitate rapid winding of the coil.

[0034] Specifically, in the direction from the first sub-frame 15 to the second sub-frame 17, the outer diameter of the multiple iron core discs 11 inside the second sub-frame 17 gradually decreases, thus forming a stepped outer peripheral surface on the second sub-frame 17; in the direction from the inner iron core frame 10 to the outer iron core frame 30, the width of the second strip 31 gradually decreases, thus forming the outer iron core frame 30 by winding the second strip 31, whose width gradually decreases from the inside to the outside, so that the outer iron core frame 30 forms a first sub-outer peripheral surface 32 and a second sub-outer peripheral surface 34 that are angled and stepped.

[0035] In some embodiments, the single-frame core 100 further includes an encapsulation layer (not shown), which is coated and cured onto the inner core frame 10 and the outer core frame 30. When manufacturing the single-frame core 100, a core disc 11 is first formed by winding a first strip 13, then multiple core discs 11 are stacked to form the inner core frame 10. Next, a second strip 31 is wound around the radial outer circumference of the inner core frame 10 to form the outer core frame 30 fitted onto the inner core frame 10. Finally, an adhesive is coated onto all exposed surfaces of the inner core frame 10 and the outer core frame 30, and the adhesive is cured by heating. This yields the encapsulation layer, which bonds and cures the inner core frame 10 and the outer core frame 30 into a single unit. Optionally, the adhesive used to make the encapsulation layer is a resin adhesive.

[0036] Furthermore, since the core cake 11 required for the inner core frame 10 is a square annular core cake 11, in any of the above embodiments, the core cake 11 is made by first rolling the first strip 13 into a circular annular core cake and then shaping it into a square annular core cake. In this way, the strip is first wound into a circular annular core cake 11, and during the winding process, the force on the strip is always along the direction of the circular tangent. The force on the strip is uniform during the winding process, the tightness of the wound core cake 11 remains consistent, and the multiple layers of strip in the core cake 11 are evenly distributed, ensuring the winding quality. At the same time, because the circular annular core cake is wound, a higher winding rotation speed can be used during the winding process, making it easier to wind the circular annular core cake. After obtaining a circular annular core cake with a good winding effect, only one shaping is needed to transform the circular annular core cake into a square annular core cake, which can conveniently and efficiently obtain multiple core cakes 11 for stacking to prepare the single-frame core 100.

[0037] In some embodiments, the first sub-frame 15 in the single-frame core 100 further includes an adhesive layer (not shown). Adjacent core discs 11 are bonded together by the adhesive layer, so that multiple core discs 11 are bonded into a whole, thereby forming the first sub-frame 15. Optionally, the core discs 11 are annealed after being wound and formed, and then stacked and bonded to form the first sub-frame 15. This is to eliminate the stress generated during the winding and shaping process of the core discs 11 through annealing, making the overall performance of the core discs 11 more stable.

[0038] See Figures 1-3 Based on the same concept, in one embodiment of the present invention, a transformer core 200 is also provided. The transformer core 200 includes a plurality of the above-mentioned single-frame cores 100, which are spliced ​​together, and a core post 50 is formed at the splicing point of every two adjacent core discs 11. In this way, a transformer core 200 with core posts 50 is formed by combining a plurality of single-frame cores 100.

[0039] In some embodiments, the number of single-frame iron cores 100 is three, and the three single-frame iron cores 100 are connected end-to-end to form a three-phase three-dimensional iron core. Specifically, each single-frame iron core 100 has a window 20, and the three single-frame iron cores 100 are connected end-to-end around a second direction perpendicular to the first direction, forming a hollow cavity 201 between the three single-frame iron cores 100 that communicates with each window 20 and extends along the second direction. In this way, coils can be wound onto the iron core column 50 through adjacent windows 20 and hollow cavities 201. It is understood that in some other embodiments, the number of single-frame iron cores 100 included in the transformer iron core 200 may also be other values, which are not limited here.

[0040] Specifically, in the three-phase three-dimensional iron core, the outer periphery of each single-frame iron core 100 is wrapped with a second strip 31, so that although the thickness of the outer periphery of the single-frame iron core 100 is reduced, the thickness direction is the width direction of the second strip 31. The internal structure of the outer periphery of the frame iron core 100 extends continuously in the thickness direction, thereby strengthening the strength in the thickness direction and preventing damage to the outer periphery of the single-frame iron core 100 in the three-phase three-dimensional iron core due to its thinness.

[0041] Specifically, the single-frame core 100 includes an inner core frame 10 and an outer core frame 30 sleeved outside the inner core frame 10. The inner core frame 10 includes a plurality of core discs 11 stacked together along a first direction. The outer core frame 30 is formed by simultaneously winding a second strip 31 around the radial outer circumferential surface of at least a portion of the core discs 11. Essentially, the single-frame core 100 is divided into inner and outer parts. By winding the second strip 31 around the inner core frame 10, the internal structure of the outer periphery of the single-frame core 100 can be changed, making the outer periphery of the single-frame core 100 more continuous and complete in the thickness direction (i.e., the width direction of the second strip 31). Unlike stacked single-frame cores, the outer periphery is not broken in the thickness direction due to the stacking of multiple core discs 11, thus improving the strength of the outer periphery of the single-frame core 100, preventing damage to the outer periphery of the single-frame core 100, and improving the reliability of the transformer core 200.

[0042] Furthermore, due to the limited width of amorphous alloy strips, it is difficult to manufacture large-size amorphous alloy transformer cores (200mm), which in turn makes the manufacture of large transformers difficult. (See also...) Figure 1 and Figure 4 To address this issue, in the single-frame core 100 provided in this embodiment, each core disc 11 within the inner core frame 10 is made by winding a first strip 13 in a first direction. Thus, the radial dimension of the core disc 11 is proportional to the number of turns of the first strip 13. When manufacturing large transformers, increasing the number of turns of the first strip 13 allows for the preparation of larger core discs 11 and the single-frame core 100, making the manufacture of large transformers more convenient.

[0043] See Figures 1-3In some embodiments, the inner core frame 10 has an inner peripheral surface 12 and a first outer peripheral surface 14 sleeved outside the inner peripheral surface 12. At least a portion of the first outer peripheral surface 14 is a straight outer peripheral surface 141, and the outer core frame 30 is sleeved outside the straight outer peripheral surface 141. The straight outer peripheral surface 141 is formed by a plurality of planes arranged and intersecting around a first direction. Thus, the straight outer peripheral surface 141 of the inner core frame 10 includes a plurality of planes. When manufacturing the outer core frame 30, the second strip 31 is wound along the straight outer peripheral surface, allowing the second strip 31 to fit tightly against the straight outer peripheral surface 141, ensuring a reliable combination of the outer core frame 30 and the inner core frame 10. This prevents gaps between the inner core frame 10 and the outer core frame 30 from affecting the overall performance of the single-frame core 100.

[0044] In some embodiments, the transformer core 200 further includes vibration damping plates. Vibration damping plates are disposed between two adjacent single-frame cores 100 to separate them, preventing hard contact and reducing noise during transformer core 100 operation. Furthermore, the vibration damping plates insulate adjacent single-frame cores 100. Optionally, the vibration damping plates are made of vibration-damping paperboard.

[0045] In some embodiments, along a direction parallel to the second direction, each single-frame core 100 has two core yokes located on opposite sides of the window 20. The surface of each core yoke facing the window 20 is planar, preventing the core yoke from protruding into the window 20 and reducing the window space, thereby increasing the winding space for winding onto the core post 50, and thus reducing the overall height of the transformer core 100. Alternatively, the surface of each core yoke facing the window 11 is stepped and curved away from the window 20, thus being constructed to curve away from the window 20 along a virtual arc, thereby increasing the internal space of the window 20, increasing the winding space for winding onto the core post 50, and thus reducing the overall height of the transformer core 100.

[0046] Based on the same concept, in one embodiment of the present invention, a transformer is also provided. The transformer includes a body, which includes the aforementioned transformer core 200. The transformer core 200 can be manufactured in a large size, thus facilitating the fabrication of large transformers. Furthermore, the outer periphery of the single-frame core 100 is the same width as the second strip 31 in the thickness direction. The internal structure of the outer periphery of the single-frame core 100 extends continuously in the thickness direction, thereby strengthening the outer periphery along the thickness direction and preventing damage due to a thin outer periphery. The body also includes a coil wound around the core post 50, used for electromagnetic induction with the interior of the core after energization, realizing the function of a transformer.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A single-frame iron core, characterized in that, The single-frame iron core includes an inner iron core frame and an outer iron core frame sleeved outside the inner iron core frame. The inner iron core frame includes a plurality of iron core discs stacked on top of each other along a first direction. The outer iron core frame is formed by simultaneously winding a second strip around at least a portion of the radial outer circumference of the iron core discs in the inner iron core frame. The inner core frame has an inner peripheral surface and a first outer peripheral surface sleeved outside the inner peripheral surface. At least a portion of the first outer peripheral surface is a straight outer peripheral surface, and the second strip in the outer core frame is wound around the straight outer peripheral surface. The inner core frame includes a first sub-frame and a second sub-frame, which are stacked along the first direction; in the direction from the first sub-frame to the second sub-frame, the outer diameter of the plurality of core discs in the second sub-frame gradually decreases; in the direction from the inner core frame to the outer core frame, the width of the second strip gradually decreases.

2. The single-frame iron core according to claim 1, characterized in that, Each of the core discs is made by winding a first strip around an axis parallel to the first direction.

3. The single-frame iron core according to claim 1, characterized in that, The first sub-frame includes a plurality of iron core discs with radially flush outer peripheral surfaces, so that the radially flush outer peripheral surfaces of the first sub-frame are formed into the flat outer peripheral surfaces.

4. The single-frame iron core according to claim 3, characterized in that, The second sub-frame includes a plurality of iron core discs arranged in a stepped manner on the radial outer peripheral surface, so that the radial outer peripheral surface of the second sub-frame is formed into a stepped outer peripheral surface; The outer core frame includes a first sub-outer peripheral surface and a second sub-outer peripheral surface that are set at an angle and are both stepped. The stepped outer peripheral surface is in contact with the first sub-outer peripheral surface to form a mating surface, and the inner peripheral surface is in contact with the second sub-outer peripheral surface to form a semi-circular surface of the core column.

5. The single-frame iron core according to any one of claims 1-4, characterized in that, The single-frame iron core also includes an encapsulation layer, which is coated and cured on the inner iron core frame and the outer iron core frame.

6. A transformer core, characterized in that, It includes multiple single-frame iron cores as described in any one of claims 1-5, wherein the multiple single-frame iron cores are spliced ​​together, and an iron core column is formed at the splicing point of each two adjacent single-frame iron cores.

7. The transformer core according to claim 6, characterized in that, The number of single-frame iron cores is three, each single-frame iron core has a window, the three single-frame iron cores are connected end to end around a second direction perpendicular to the first direction, and a hollow cavity is formed between the three single-frame iron cores that communicates with each of the windows and runs through the second direction.

8. A transformer, characterized in that, The transformer includes a body, which includes a coil and the transformer core as described in claim 6 or 7 above, wherein the coil is wound around the core post of the transformer core.

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