CN215955015U - Single-frame iron core, transformer iron core and transformer - Google Patents

Abstract

The utility model relates to a single-frame iron core, a transformer iron core and a transformer, wherein the single-frame iron core comprises an inner iron core frame and an outer iron core frame sleeved outside the inner iron core frame, the inner iron core frame comprises a plurality of iron core cakes which are mutually laminated along a first direction, and the outer iron core frame is formed by simultaneously winding a second strip material on the radial outer peripheral surfaces of at least part of the iron core cakes in the plurality of iron core cakes. The single-frame iron core is divided into an inner part and an outer part, the second strip is wound on the inner iron core frame, the internal structure of the periphery of the single-frame iron core can be changed, the structure of the outer periphery of the single-frame iron core is more continuous and complete in the thickness direction (namely in the width direction of the second strip), the outer periphery of the single-frame iron core is not broken in the thickness direction due to the stacking of a plurality of iron core cakes like the traditional single-frame iron core, the strength of the periphery of the single-frame iron core is further improved, the periphery of the single-frame iron core is prevented from being damaged, and the reliability of the transformer iron core is improved.

Description

Single-frame iron core, transformer iron core and transformer

Technical Field

The utility model relates to the technical field of transformers, in particular to a single-frame iron core, a transformer iron core and a transformer.

Background

The transformer is basic equipment for power transmission and distribution, and is widely applied to the fields of industry, agriculture, traffic, urban communities and the like. A Transformer (Transformer) is a device for changing an alternating voltage by using the principle of electromagnetic induction, and the main components are a coil and an iron core (magnetic core), and the Transformer has the main functions of: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), and the like. The iron core is an important part in the transformer, and some iron cores are manufactured by firstly winding an amorphous strip material into an iron core cake and then stacking multiple layers of the iron core cake. However, the strength of the amorphous strip itself is low, and the strength of the outer periphery of the core formed by winding and stacking is low, and the core is easily damaged.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a single-frame iron core, a transformer iron core and a transformer for solving the problem of low peripheral strength of the single-frame iron core in the stacked amorphous alloy three-phase three-dimensional iron core.

The single-frame iron core comprises an inner iron core frame and an outer iron core frame sleeved outside the inner iron core frame, wherein the inner iron core frame comprises a plurality of iron core cakes stacked along a first direction, and the outer iron core frame is simultaneously wound on at least part of the inner iron core frame through a second strip.

The single-frame iron core is divided into an inner part and an outer part, the second strip is wound on the inner iron core frame, the internal structure of the periphery of the single-frame iron core can be changed, the structure of the periphery of the single-frame iron core is more continuous and complete in the thickness direction (namely in the width direction of the second strip), the periphery of the single-frame iron core is not disconnected in the thickness direction due to the fact that a plurality of iron core cakes are stacked like the periphery of a stacked single-frame iron core, the strength of the periphery of the single-frame iron core is further improved, the periphery of the single-frame iron core is prevented from being damaged, and the reliability of the transformer iron core is improved.

In one embodiment, each said core cake is made from a first strip of material wound about an axis parallel to said first direction. Therefore, the radial size of the iron core cake is in direct proportion to the number of winding turns of the first strip material, when a large-scale transformer needs to be manufactured, the number of winding turns of the first strip material is increased, and then the large-scale iron core cake and the single-frame iron core can be manufactured, and the large-scale transformer is convenient to manufacture.

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 part of the first outer peripheral surface is a straight outer peripheral surface, and the second strip in the outer core frame is wound on the straight outer peripheral surface.

In one embodiment, the inner core frame comprises a first sub-frame body, and the first sub-frame body comprises a plurality of core cakes with flush radial outer peripheral surfaces, so that the radial outer peripheral surfaces of the first sub-frame body are molded into the flat outer peripheral surfaces.

In one embodiment, the inner core frame further includes a second sub-frame body, the first sub-frame body and the second sub-frame body are stacked in the first direction, and the second sub-frame body includes a plurality of core cakes arranged in a step-like manner on the outer circumferential surface in the radial direction, so that the outer circumferential surface in the radial direction of the second sub-frame body is formed into a step-like outer circumferential surface;

the outer iron core frame comprises a first sub-outer peripheral surface and a second sub-outer peripheral surface which are arranged in an angle mode and are in a step shape, the step-shaped outer peripheral surface is in butt joint with the first sub-outer peripheral surface to form a matching surface, and the inner peripheral surface is in butt joint with the second sub-outer peripheral surface to form a half peripheral surface of the iron core column.

In one embodiment, the outer diameters of a plurality of iron core cakes in the second subframe are gradually reduced in the direction in which the first subframe points to the second subframe body;

the width of the second strip material is gradually reduced in a direction in which the inner core frame is directed toward the outer core frame.

In one embodiment, the single-frame iron core further comprises an encapsulation layer, and the encapsulation layer is coated and cured on the inner iron core frame and the outer iron core frame.

The utility model provides a transformer core, three-phase three-dimensional iron core a plurality of above-mentioned single frame iron core, it is a plurality of single frame iron core splices each other, every adjacent two single frame iron core concatenation department forms the iron core post.

In one embodiment, the number of the single-frame iron cores is three, each single-frame iron core is provided with a window, the three single-frame iron cores are in end-to-end butt joint around a second direction perpendicular to the first direction, and a hollow cavity communicated with each window and penetrating along the second direction is formed among the three single-frame iron cores.

A transformer comprises a transformer body, wherein the transformer body comprises a coil and the transformer core, and the coil is wound on the core column of the transformer core.

Drawings

Fig. 1 is a schematic structural diagram of a transformer core according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a single-frame core of the transformer core shown in FIG. 1;

fig. 3 is a schematic structural view of an inner core frame in the single-frame core shown in fig. 2;

fig. 4 is a schematic view showing the structure of the core cake in the inner core frame shown in fig. 3.

Description of reference numerals: 200. a transformer core; 201. a hollow cavity; 100. a single-frame iron core; 10. an inner core frame; 11. a discus with iron core; 12. an inner peripheral surface; 14. a first outer peripheral surface; 141. a straight outer peripheral surface; 143. a stepped outer peripheral surface; 13. a first strip; 15. a first sub-frame body; 17. a second sub-frame body; 18. a mating surface; 19. A half peripheral surface; 20. a window; 30. an outer core frame; 31. a second strip; 32. a first sub outer peripheral surface; 34. a second sub-outer peripheral surface; 50. a core limb.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1-3, in an embodiment of the present invention, a single-frame 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 cakes 11 stacked on each other along a first direction, and the outer iron core frame 30 is formed by simultaneously winding a second strip 31 around at least a part of the radial outer circumferential surfaces of the iron core cakes 11 in the inner iron core frame 10. Equivalently, the single-frame iron core 100 is divided into the inner part and the outer part, so that the inner structure of the outer periphery of the single-frame iron core 100 can be changed by winding the second strip 31 on the inner iron core frame 10, the structure of the outer periphery of the single-frame iron core 100 in the thickness direction (namely the width direction of the second strip 31) is more continuous and complete, the stacking of a plurality of iron core cakes 11 is not broken in the thickness direction like the outer periphery of the stacked single-frame iron core, the strength of the outer periphery of the single-frame iron core 100 is improved, the outer periphery of the single-frame iron core 100 is prevented from being damaged, and the reliability of the transformer iron core 200 is improved.

In addition, the width of the amorphous alloy strip is limited, and it is difficult to manufacture the transformer core 200 of large-sized amorphous alloy, and thus it is difficult to manufacture a large-sized transformer. Referring to fig. 1 and 4, in order to solve the problem, in the single frame core 100 of the present embodiment, each core cake 11 in the inner core frame 10 is made of a first tape 13 wound around an axis parallel to the first direction. Therefore, the radial size of the iron core cake 11 is in direct proportion to the number of winding turns of the first strip 13, when a large-scale transformer needs to be manufactured, the number of winding turns of the first strip 13 is increased, so that the large-scale iron core cake 11 and the single-frame iron core 100 can be manufactured, and the large-scale transformer is simple and convenient to manufacture.

Optionally, the first strip 13 is an amorphous alloy strip, such as an iron-based amorphous alloy strip, and has high saturation magnetic induction, and excellent magnetic permeability, excitation current, iron loss, and the like. In addition, the width of the first strip 13 is 10mm-150mm, and the first strip can be selected according to the condition of actually designing the iron core; the thickness of the first strip 13 is 0.01mm-0.03mm, and can also be selected according to the actual design condition of the iron core. Still optionally, the second strip 31 is a silicon steel strip, or an amorphous alloy strip.

Referring to fig. 1-3, in some embodiments, the inner core frame 10 has an inner circumferential surface 12 and a first outer circumferential surface 14 sleeved outside the inner circumferential surface 12, at least a portion of the first outer circumferential surface 14 is a straight outer circumferential surface 141, and the outer core frame 30 is sleeved outside the straight outer circumferential surface 141. The straight peripheral surface 141 is formed by a plurality of planes which are arranged around the first direction and are connected end to end in an intersecting manner. In this way, the flat outer circumferential surface 141 of the inner core frame 10 includes a plurality of flat surfaces, the second strip 31 is wound around the flat outer circumferential surface 141 when the outer core frame 30 is manufactured, and the second strip 31 can be closely attached to the flat outer circumferential surface 141, so that the outer core frame 30 and the inner core frame 10 are reliably combined, and the gap between the inner core frame 10 and the outer core frame 30 is prevented from affecting the overall performance of the single frame core 100.

Further, the inner core frame 10 includes a first sub-frame 15, and the first sub-frame 15 includes a plurality of core pieces 11 having flush radial outer peripheral surfaces, so that the radial outer peripheral surface in the first sub-frame 15 is formed into a flat outer peripheral surface 141, thereby facilitating winding of the second tape 31. Specifically, the second strip 31 in the second frame body is simultaneously wound around the radial outer peripheral surfaces of all the iron core cakes 11 in the first sub-frame body 15, so as to be fittingly sleeved with the outer iron core frame 30 through the straight outer peripheral surface 141 formed by the first sub-frame body 15.

Further, the inner core frame 10 further includes a second sub-frame body 17, the first sub-frame body 15 and the second sub-frame body 17 are laminated in the first direction, and the second sub-frame body 17 includes a plurality of core pieces 11 whose radially outer peripheral surfaces are provided in a step shape, so that the radially outer peripheral surface of the second sub-frame body 17 is formed into a step-shaped outer peripheral surface 143. The outer core frame 30 includes a first sub outer peripheral surface 32 and a second sub outer peripheral surface 34 which are disposed at an angle and are stepped, the stepped outer peripheral surface 143 abuts against the first sub outer peripheral surface 32 to form the mating surface 18, and the inner peripheral surface 12 abuts against the second sub outer peripheral surface 34 to form the half peripheral surface 19 of the core limb 50. Thus, each single-frame iron core 100 has a matching surface 18 and a half-circumference surface 19, when the transformer iron core 200 is assembled, the matching surfaces 18 of two adjacent single-frame iron cores 100 are butted, so that the two half-circumference surfaces 19 of two adjacent single-frame iron cores 100 are butted with each other to form the outer circumference surface of the whole iron core column 50, and the iron core column 50 is formed at the butted position of the two adjacent single-frame iron cores 100. Optionally, the core limb 50 is approximately elliptical or circular in cross-section to facilitate rapid winding of the coil.

Specifically, in the direction in which the first sub-frame body 15 is directed to the second sub-frame body 17, the outer diameters of the plurality of core compacts 11 in the second sub-frame body 17 are gradually reduced, so that a stepped outer peripheral surface is formed on the second sub-frame body 17; the width of the second strip 31 is gradually reduced in a direction in which the inner core frame 10 is directed toward the outer core frame 30, so that the outer core frame 30 is formed by winding the second strip 31, the width of which is gradually reduced from the inside to the outside, such that the outer core frame 30 is formed with a first sub outer circumferential surface 32 and a second sub outer circumferential surface 34 which are angularly disposed and are both stepped.

In some embodiments, the single-frame core 100 further includes an encapsulation layer (not shown), which is coated and cured on the inner core frame 10 and the outer core frame 30. When the single-frame iron core 100 is manufactured, the first strip 13 is wound to form the iron core cakes 11, then the plurality of iron core cakes 11 are stacked to form the inner iron core frame 10, the second strip 31 is wound on the radial outer peripheral surface of the inner iron core frame 10 to form the outer iron core frame 30 sleeved on the inner iron core frame 10, finally, colloid is coated on the whole exposed surface of the inner iron core frame 10 and the outer iron core frame 30, the colloid is heated and cured, the packaging layer packaged and cured on the inner iron core frame 10 and the outer iron core frame 30 can be obtained, and the inner iron core frame 10 and the outer iron core frame 30 can be bonded and cured into a whole through the packaging layer. Optionally, the glue for making the encapsulation layer is resin glue.

In addition, since the core cake 11 required for the inner core frame 10 is the square ring-shaped core cake 11, in any of the above embodiments, the core cake 11 is made by winding the first tape 13 into the circular ring-shaped core cake and then shaping it into the square ring-shaped core cake. Therefore, the strip is wound into the circular annular iron core cake 11, the stress direction of the strip is along the direction of a circular tangent line in the winding process, the stress is uniform in the winding process of the strip, the tightness of the wound iron core cake 11 is kept consistent, and multiple layers of strips in the iron core cake 11 are uniformly distributed, so that the winding quality is ensured. Meanwhile, because the circular annular iron core cake is wound, a higher winding rotation speed can be adopted in the winding process, and the circular annular iron core cake is convenient to wind. After the circular annular iron core cake with a good winding effect is prepared, the circular annular iron core cake can be changed into the square annular iron core cake only by once reshaping, and a plurality of iron core cakes 11 for preparing the single-frame iron core 100 in a stacked mode can be conveniently and efficiently obtained.

In some embodiments, the first sub-frame body 15 in the single-frame iron core 100 further includes an adhesive layer (not shown), and two adjacent iron core cakes 11 are adhered by the adhesive layer, so that the plurality of iron core cakes 11 are adhered into a whole, and then the first sub-frame body 15 is formed. Optionally, the iron core cake 11 is annealed after being wound and formed, and then stacked and pasted to form the first sub-frame 15, so that stress generated in the winding and shaping processes of the iron core cake 11 is eliminated through annealing, and the overall performance of the iron core cake 11 is more stable.

Referring to fig. 1 to 3, based on the same concept, in an embodiment of the present invention, a transformer core 200 is further provided, where the transformer core 200 includes a plurality of the single-frame cores 100, the plurality of single-frame cores 100 are spliced with each other, and a core column 50 is formed at a splicing position of each two adjacent core cakes 11. In this way, the plurality of single-frame cores 100 are combined to form the transformer core 200 having the core limb 50.

In some embodiments, the number of the single-frame iron cores 100 is three, and three single-frame iron cores 100 are butted end to form a three-phase three-dimensional iron core. Specifically, each single-frame iron core 100 has a window 20, the three single-frame iron cores 100 are in end-to-end butt joint with each other around a second direction perpendicular to the first direction, and a hollow cavity 201 communicated with each window 20 and penetrating along the second direction is formed between the three single-frame iron cores 100. Thus, the coil can be wound around the core limb 50 through the two adjacent windows 20 and the hollow cavity 201. It is understood that in other embodiments, the number of the single-frame cores 100 included in the transformer core 200 may be other values, and is not limited herein.

Specifically, in the three-phase three-dimensional core, the second strip 31 is wrapped and wound around the outer periphery of each single-frame core 100, so that although the thickness of the outer periphery of the single-frame core 100 is reduced, the outer periphery of the single-frame core 100 is in the width direction of the second strip 31 in the thickness direction, the inner structure of the outer periphery of the frame core 100 continuously extends in the thickness direction, the strength in the thickness direction is further enhanced, and the outer periphery of the single-frame core 100 is prevented from being thin and damaged in the three-phase three-dimensional core.

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 cakes 11 stacked on each other along a first direction, and the outer core frame 30 is formed by simultaneously winding a second tape 31 around at least a part of the radial outer circumferential surfaces of the core cakes 11 in the plurality of core cakes 11. Equivalently, the single-frame iron core 100 is divided into the inner part and the outer part, so that the inner structure of the outer periphery of the single-frame iron core 100 can be changed by winding the second strip 31 on the inner iron core frame 10, the structure of the outer periphery of the single-frame iron core 100 in the thickness direction (i.e. in the width direction of the second strip 31) is more continuous and complete, and the outer periphery of the single-frame iron core 100 is not broken in the thickness direction due to the stacking of a plurality of iron core cakes 11 like the outer periphery of the stacked single-frame iron core, thereby improving the strength of the outer periphery of the single-frame iron core 100, preventing the outer periphery of the single-frame iron core 100 from being damaged, and improving the reliability of the transformer iron core 200.

In addition, the width of the amorphous alloy strip is limited, and it is difficult to manufacture the transformer core 200 of large-sized amorphous alloy, and thus it is difficult to manufacture a large-sized transformer. Referring to fig. 1 and 4, in order to solve this problem, the present embodiment provides a single frame core 100 in which each core cake 11 in an inner core frame 10 is made of a first tape 13 wound around a first direction. Therefore, the radial size of the iron core cake 11 is in direct proportion to the number of winding turns of the first strip 13, when a large-scale transformer needs to be manufactured, the number of winding turns of the first strip 13 is increased, so that the large-scale iron core cake 11 and the single-frame iron core 100 can be manufactured, and the large-scale transformer is convenient to manufacture.

Referring to fig. 1-3, in some embodiments, the inner core frame 10 has an inner circumferential surface 12 and a first outer circumferential surface 14 sleeved outside the inner circumferential surface 12, at least a portion of the first outer circumferential surface 14 is a straight outer circumferential surface 141, and the outer core frame 30 is sleeved outside the straight outer circumferential surface 141. The straight peripheral surface 141 is formed by a plurality of planes which are arranged around the first direction and are connected in an intersecting manner. In this way, the flat outer circumferential surface 141 of the inner core frame 10 includes a plurality of flat surfaces, the second strip 31 is wound along the flat outer circumferential surface when the outer core frame 30 is manufactured, and the second strip 31 can be closely attached to the flat outer circumferential surface 141, so that the outer core frame 30 and the inner core frame 10 are reliably combined, and the gap between the inner core frame 10 and the outer core frame 30 is prevented from affecting the overall performance of the single frame core 100.

In some embodiments, the transformer core 200 further includes a vibration reduction plate, and the vibration reduction plate is disposed between two adjacent single-frame cores 100, so as to separate the two adjacent single-frame cores 100 by the vibration reduction plate, thereby preventing the two adjacent single-frame cores 100 from being in hard contact, and reducing noise generated when the transformer core 100 operates. The two adjacent single-frame cores 100 are insulated by the damping sheet. Optionally, the damping sheet is a damping paperboard.

In some embodiments, each of the single-frame cores 100 has two core yokes respectively located at two opposite sides of the window 20 along a direction parallel to the second direction, and a surface of each of the core yokes facing the window 20 is a plane, so that the core yokes are prevented from protruding into the window 20 to reduce a space of the window, thereby increasing a winding space for winding the core limb 50, and further reducing an overall height of the transformer core 100. Or, the surface of each core yoke facing the window 11 is in a step shape and is arranged in a bending manner in a direction away from the window 20, so that the core yoke is configured to be bent away from the window 20 along a virtual arc, thereby increasing the internal space of the window 20, increasing the winding space for winding the core limb 50, and further reducing the overall height of the transformer core 100.

Based on the same concept, in an embodiment of the utility model, a transformer is further provided. The transformer comprises a transformer body, the transformer body comprises the transformer core 200, and the transformer core 200 can be manufactured into a large size, so that a large transformer can be manufactured conveniently. Further, the outer peripheral side of the single frame core 100 is the width direction of the second strip 31 in the thickness direction, and the inner structure of the outer peripheral side of the single frame core 100 extends continuously in the thickness direction, thereby enhancing the strength of the outer peripheral side in the thickness direction and preventing the outer peripheral side of the single frame core 100 from being thin and damaged. The transformer body further comprises a coil, wherein the coil is wound on the iron core column 50 and used for performing electromagnetic induction with the inside of the iron core after being electrified, and the function of the transformer is realized.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The single-frame iron core is characterized by comprising an inner iron core frame and an outer iron core frame sleeved outside the inner iron core frame, wherein the inner iron core frame comprises a plurality of iron core cakes which are mutually stacked along a first direction, and the outer iron core frame is simultaneously wound on at least part of the radial outer peripheral surface of the iron core cakes in the inner iron core frame through a second strip.

2. The single frame core as defined in claim 1, wherein each of said core cakes is made of a first strip material wound about an axis parallel to said first direction.

3. The single-frame iron core according to claim 1, wherein the inner iron 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 flat outer peripheral surface, and the second strip in the outer iron core frame is wound around the flat outer peripheral surface.

4. The single-frame iron core according to claim 3, wherein the inner core frame comprises a first sub-frame body including a plurality of the core biscuits whose radially outer peripheral surfaces are flush, so that the radially outer peripheral surface of the first sub-frame body is shaped into the flat outer peripheral surface.

5. The single-frame core according to claim 4, wherein the inner core frame further comprises a second sub-frame body, the first sub-frame body and the second sub-frame body are laminated in the first direction, and the second sub-frame body comprises a plurality of core pieces whose radially outer peripheral surfaces are arranged in a stepped manner, so that the radially outer peripheral surface of the second sub-frame body is shaped into a stepped outer peripheral surface;

the outer iron core frame comprises a first sub-outer peripheral surface and a second sub-outer peripheral surface which are arranged in an angle mode and are in a step shape, the step-shaped outer peripheral surface is in butt joint with the first sub-outer peripheral surface to form a matching surface, and the inner peripheral surface is in butt joint with the second sub-outer peripheral surface to form a half peripheral surface of the iron core column.

6. The single-frame core according to claim 5, wherein outer diameters of a plurality of the core cakes in the second sub-frame body are gradually reduced in a direction in which the first sub-frame body is directed toward the second sub-frame body;

the width of the second strip material is gradually reduced in a direction in which the inner core frame is directed toward the outer core frame.

7. The single-frame iron core according to any one of claims 1 to 6, further comprising an encapsulation layer, wherein the encapsulation layer is coated and cured on the inner iron core frame and the outer iron core frame.

8. A transformer core, comprising a plurality of single-frame cores as claimed in any one of claims 1 to 7, wherein the plurality of single-frame cores are spliced with each other, and a core column is formed at the splicing position of every two adjacent single-frame cores.

9. The transformer core according to claim 8, wherein the number of the single-frame cores is three, each of the single-frame cores has a window, the three single-frame cores are butted end to end around a second direction perpendicular to the first direction, and a hollow cavity communicated with each of the windows and penetrating in the second direction is formed among the three single-frame cores.

10. A transformer, characterized by comprising a body comprising a coil and a transformer core as claimed in claim 8 or 9, said coil being wound around said core leg of said transformer core.

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