CN115497735A - Method for manufacturing transformer iron core - Google Patents

Abstract

The invention relates to a method for manufacturing a transformer iron core, which comprises the following steps: preparing a plurality of groups of iron core cake groups, wherein each group of iron core cake group comprises a plurality of circular ring-shaped iron core cakes which are formed by winding standby strips; each circular annular iron core cake in each iron core cake group is changed into a square annular iron core cake; a plurality of square annular iron core cakes in each group of iron core cake groups are stacked to form a plurality of single-frame iron cores; and splicing the single-frame iron cores to form the transformer iron core with the iron core columns. In the manufacturing method of the transformer core, the size of the transformer core is not limited by the width of the strip, so that the manufacturing difficulty of the large-size transformer core is greatly reduced. In addition, in the manufacturing method of the transformer core, the spare strip is firstly wound into the circular annular core cake, then the circular annular core cake can be changed into the square annular core cake only by once reshaping, and a plurality of square annular core cakes used for stacking and preparing the single-frame core can be conveniently and efficiently manufactured.

Description

Method for manufacturing transformer iron core

Technical Field

The invention relates to the technical field of transformers, in particular to a method for manufacturing a transformer iron core.

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 ac voltage by using the principle of electromagnetic induction, and has main components of a coil and an iron core (magnetic core), and has the main functions of: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), and the like. In recent years, amorphous alloy transformers are increasingly used with the development of transformer technology. However, the method is limited by the width of the amorphous strip, and a large-size amorphous alloy iron core cannot be manufactured according to a general method for manufacturing an involute iron core.

Disclosure of Invention

Therefore, it is necessary to provide a method for manufacturing a transformer core, which aims at the problems that it is difficult to manufacture a large-sized amorphous alloy core and the manufacturing efficiency is low.

A method for manufacturing a transformer core comprises the following steps:

preparing a plurality of groups of iron core cake groups, wherein each group of iron core cake groups comprises a plurality of circular ring-shaped iron core cakes which are formed by winding standby strips;

shaping each circular annular iron core cake in each iron core cake group into a square annular iron core cake;

a plurality of the square ring-shaped iron core cakes in each set of the iron core cake sets are laminated to form a single-frame iron core, so that a plurality of single-frame iron cores are prepared by a plurality of sets of the iron core cake sets;

and splicing a plurality of the single-frame iron cores into a transformer iron core with an iron core column.

According to the manufacturing method of the transformer core, the standby strip material is wound into the circular annular iron core cake through the winding die, then the shaping die applies external force to the circular annular iron core cake to enable the circular annular iron core cake to be changed into the square annular iron core cake, then the square annular iron core cakes can be stacked to form the single-frame iron core, and finally the transformer core with the iron core columns can be formed by splicing the square annular iron core cakes. Therefore, the radial size of the iron core cake is in direct proportion to the number of turns of the wound standby strip, the more the number of turns of the wound standby strip is, the larger the radial size of the iron core cake is, and finally, the height of the single-frame iron core formed by stacking the plurality of iron core cakes is higher, so that the large-size amorphous alloy transformer iron core can be prepared, the size of the amorphous alloy transformer iron core is not limited by the width of the strip any more, and the manufacturing difficulty of the large-size amorphous alloy transformer iron core is greatly reduced.

In addition, in the manufacturing method of the transformer iron core, the standby strip is wound into the circular annular iron core cake, the stress directions of the standby strip in the winding process are all along the direction of a circular tangent line, the stress is uniform in the winding process of the standby strip, the tightness of the wound iron core cake is kept consistent, and the plurality of layers of standby strips in the iron core cake are uniformly distributed to ensure the winding quality. 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 wound more conveniently and efficiently. After the circular annular iron core cake with better winding effect is efficiently prepared, the circular annular iron core cake can be deformed into the square annular iron core cake only by once reshaping, and a plurality of square annular iron core cakes for stacking and preparing the single-frame iron core can be obtained.

In one embodiment, the step of shaping each circular ring-shaped iron core cake in each set of iron core cake sets into a square ring-shaped iron core cake is specifically as follows:

the inner circumference side of the circular annular iron core cake is firstly supported to be square, and then the outer circumference side of the circular annular iron core cake is extruded to be square.

In one embodiment, the step of winding the circular annular iron core cake formed by the standby strip material specifically comprises the following steps:

and winding a spare belt material on the first protection ring to form the circular annular iron core cake, and sleeving a second protection ring on the outer periphery of the circular annular iron core cake.

In one embodiment, the material of the backup ribbon is an amorphous alloy; and/or

The first protection ring and the second protection ring are both made of silicon steel sheets.

In one embodiment, before the step of stacking a plurality of square ring-shaped core cakes in each group of core cake groups to form a plurality of single-frame cores, the method further comprises the following steps:

and annealing the square annular iron core cake.

In one embodiment, after the step of annealing the square ring-shaped core cake, the method further comprises the following steps:

and curing each square ring-shaped iron core cake by using a first colloid coating.

In one embodiment, the step of stacking the plurality of square ring-shaped core cakes in each group of the core cake groups to form a plurality of single-frame cores specifically includes:

and two adjacent square annular iron core cakes in each iron core cake group are bonded through a second colloid.

In one embodiment, after the step of stacking a plurality of square ring-shaped core cakes in each group of core cake groups to form a plurality of single-frame cores, the method further comprises the following steps:

and coating and curing each single-frame iron core by using a third colloid.

In one embodiment, before the step of preparing a plurality of sets of core cake sets, each set of core cake sets including a plurality of circular ring-shaped core cakes each formed by winding a spare strip material, the method further comprises the following steps:

and slitting the initial strip with wider width to obtain the standby strip with narrower width.

A method for manufacturing a transformer core comprises the following steps:

preparing a plurality of groups of iron core cake groups, wherein each group of iron core cake groups comprises a plurality of square annular iron core cakes which are formed by directly winding standby strips;

stacking a plurality of square ring-shaped iron core cakes in each iron core cake group to form a plurality of single-frame iron cores;

and splicing a plurality of the single-frame iron cores to form the transformer iron core with the iron core column.

Drawings

FIG. 1 is a schematic flow chart illustrating a method for manufacturing a transformer core according to an embodiment of the present invention;

FIG. 2 is a schematic view of a transformer core manufactured by the transformer core manufacturing method shown in FIG. 1;

FIG. 3 is a schematic structural diagram of the transformer core shown in FIG. 2 from another perspective;

FIG. 4 is an enlarged, partial cross-sectional view of the transformer core shown in FIG. 3;

fig. 5 is a schematic structural diagram of a circular ring-shaped iron core cake in the manufacturing method of the transformer iron core provided by the invention;

fig. 6 is a schematic structural diagram of a shaping mold used in the method for manufacturing a transformer core according to the present invention;

FIG. 7 is a schematic structural diagram of a square ring-shaped iron core cake shaped by the shaping mold shown in FIG. 6;

fig. 8 is a schematic view showing the structure of another circular ring-shaped core cake in the transformer core manufacturing method according to the present invention;

fig. 9 is a square ring-shaped core cake obtained by shaping the circular ring-shaped core cake shown in fig. 8.

100. A transformer core; 10. a single-frame iron core; 11. a window; 12. a circular ring-shaped iron core cake; 13. a standby strip; 14. a square ring-shaped iron core cake; 15. an inner frame; 151. a first inner frame side; 153. a second inner frame side; 16. an outer frame; 161. a first outer frame side; 163. a second outer frame side; 20. a hollow cavity; 30. a core limb; 52. a first guard ring; 54. a second guard ring; 200. shaping the die; 210. an inner mold; 230. and (7) outer molding.

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, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.

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 invention 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 invention.

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 according to specific situations by those of ordinary skill in the art.

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," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second 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. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Referring to fig. 1-4, in an embodiment of the present invention, a method for manufacturing a transformer core 100 is provided, including the following steps:

in step S100, the initial strip with a wider width is slit to obtain a spare strip 13 with a narrower width, which is convenient for winding in the subsequent step S200. Alternatively, the width of the spare strip 13 is 10-50mm, and the thickness of the circular ring-shaped iron core cake 12 obtained by winding is equal to the width of the spare strip 13, so that the spare strip 13 with different widths can be selected according to the design requirements, and the circular ring-shaped iron core cake 12 with different required thicknesses can be obtained.

Step S200, preparing a plurality of sets of iron core cake groups, each set of iron core cake groups including a plurality of circular ring-shaped iron core cakes 12 each formed by winding a spare tape 13.

In step S300, each circular ring-shaped core cake 12 in each group of core cake groups is shaped into a square ring-shaped core cake 14.

Referring to fig. 5 to 7, specifically, the inner circumference side of the circular ring-shaped core cake 12 is first expanded into a square shape, and the outer circumference side of the circular ring-shaped core cake 12 is then pressed into a square shape. That is, when shaping the circular ring-shaped core cake 12 into the square ring-shaped core cake 14, the inner mold 210 of the shaping mold 200 is first placed on the inner peripheral side of the circular ring-shaped core cake 12, and the inner peripheral side of the circular ring-shaped core cake 12 is supported in a square shape conforming to the outer periphery of the inner mold 210; then, the outer periphery of the circular ring-shaped core compact 12 is sandwiched by the outer mold 230, and the outer periphery of the circular ring-shaped core compact 12 is sandwiched in a square shape conforming to the inner periphery of the outer mold 230. So, alright be whole circular cyclic annular iron core cake 12 plastic for square ring form iron core cake 14, and the inside multilayer spare strip 13 of square ring form iron core cake 14 after the plastic is the square ring winding that is all smooth, inside spare strip 13 can not appear the fold because of the plastic, guarantees the quality of square ring form iron core cake 14 through earlier inside-outside plastic mode.

Referring to fig. 8 and 9, alternatively, the step of winding the spare belt material 13 to form the circular ring-shaped core cake 12 in step S100 is to wind the spare belt material 13 on the first protection ring 52 to form the circular ring-shaped core cake 12, and to sleeve the second protection ring 54 on the outer circumference of the circular ring-shaped core cake 12. In this way, the first protective ring 52 and the second protective ring 54 are respectively sleeved on the inner periphery and the outer periphery of the circular ring-shaped iron core cake 12, the strength of the inner periphery and the outer periphery is improved, when the circular ring-shaped iron core cake 12 is shaped by the shaping die 200, the first protective ring 52 and the second protective ring 54 are respectively in direct contact with the first protective ring 52 and the second protective ring 54, shaping force is applied to the spare belt material 13 in the circular ring-shaped iron core cake 12 through the first protective ring 52 and the second protective ring 54, the spare belt material 13 of the circular ring-shaped iron core cake 12 is prevented from being directly extruded by the shaping die 200 to be damaged, and the spare belt material 13 in the circular ring-shaped iron core cake is protected through the first protective ring 52 and the second protective ring 54, the strength of the whole inner periphery and the outer periphery of the circular ring-shaped iron core cake 12 is improved, and the wear resistance is improved.

Specifically, the material of the spare strip 13 is amorphous alloy, such as iron-based amorphous alloy strip, the thickness of which is 0.01-0.04mm, and the width of which is 10-150mm; the magnetic material has high saturation magnetic induction intensity, and is excellent in magnetic conductivity, exciting current, iron loss and the like. The first protective ring 52 and the second protective ring 54 are made by winding a plurality of turns of silicon steel strips, for example, three turns of silicon steel strips, the thickness of the silicon steel strips is 0.1-1mm, the strength of the silicon steel strips is high, and the amorphous alloy strips can be effectively protected. It is understood that the first protective ring 52 and the second protective ring 54 may be made of other magnetic metal materials, and are not limited herein.

Step S400, annealing the square ring-shaped iron core cake 14, eliminating the stress generated inside when the circular ring-shaped iron core cake 12 is shaped into the square ring-shaped iron core cake 14, so that the shape and the structure of the whole shaped square ring-shaped iron core cake 14 are not changed due to the existence of the internal stress, the shape and the structure stability of the square ring-shaped iron core cake 14 are ensured, and the quality of the transformer iron core 100 is further ensured. Wherein the temperature of the heat treatment annealing is 300-400 ℃, and the time of the heat treatment annealing is 3-12 hours. Moreover, the heat treatment annealing process is carried out in a protective gas atmosphere to prevent the square annular iron core from being oxidized, for example, the protective gas is nitrogen or inert gas; in addition, the heat treatment annealing process is performed in a direct current magnetic field environment, and the hysteresis loop of the square ring-shaped core cake 14 is improved.

Further, after annealing the square ring-shaped core cake 14, the method further comprises the following steps: each square ring-shaped core cake 14 is cured using a first gel pack. For further ensuring the stability of the square annular iron core cake 14, the square annular iron core cake 14 is wrapped with a first colloid, and then the first colloid is heated and cured, so that a layer of cured first colloid can be wrapped on the square annular iron core cake 14, and then the square annular iron core cake 14 is cured. Optionally, the first colloid is a resin glue.

In step S500, a plurality of square ring-shaped core biscuits 14 in each core biscuit group are stacked to form a single-frame core 10, so that a plurality of single-frame cores 10 are prepared from a plurality of groups of core biscuit groups.

Specifically, two adjacent square ring-shaped iron core cakes 14 in each iron core cake group are bonded through a second colloid, so that the plurality of square ring-shaped iron core cakes 14 in each iron core cake group are stacked and assembled, and finally, a plurality of groups of iron core cake groups are stacked to obtain a plurality of single-frame iron cores 10. Optionally, the second colloid is a resin glue.

Step S600, each single-frame iron core 10 is wrapped and cured by using a third colloid, that is, each single-frame iron core 10 is wrapped and covered with the third colloid, and then the third colloid is cured by heating, and each single-frame iron core 10 is covered with a layer of cured third colloid, so that the multiple layers of iron core cakes in the single-frame iron core 10 are reliably integrated into a whole. Optionally, the third colloid is a resin glue.

Step S700, a plurality of single-frame iron cores 10 are spliced to form the transformer iron core 100 with the iron core column 30, and referring to fig. 2-4, the obtained transformer iron core 100 is shown in the figure.

In the manufacturing method of the transformer core, the spare strip 13 is wound by the winding die to form the circular annular core cake 12, then the shaping die 200 applies external force to the circular annular core cake 12 to deform the circular annular core cake 12 into the square annular core cake 14, then a plurality of square annular core cakes 14 are stacked to form the single-frame core 10, and finally the single-frame cores 10 are spliced to form the transformer core 100 with the core column 30. Therefore, the radial size of the iron core cake is in direct proportion to the number of turns of the wound standby strip 13, the more the number of turns of the wound standby strip 13 is, the larger the radial size of the iron core cake is, and finally, the single-frame iron core 10 formed by stacking a plurality of iron core cakes is higher in height, so that the large-size amorphous alloy transformer iron core 100 can be prepared, the size of the amorphous alloy transformer iron core 100 is not limited by the width of the strip any more, and the manufacturing difficulty of the large-size amorphous alloy transformer iron core 100 is greatly reduced.

In addition, in the manufacturing method of the transformer core 100, the standby strip 13 is wound into the circular ring-shaped core cake 12, the stress directions of the standby strip 13 are all along the direction of a circular tangent line in the winding process, the stress is uniform in the winding process of the standby strip 13, the tightness of the wound core cake is kept consistent, and the plurality of layers of standby strips 13 in the core cake are uniformly distributed, so that the winding quality is ensured. Meanwhile, because the circular annular iron core cake 12 is wound, a higher winding rotation speed can be adopted in the winding process, and the circular annular iron core cake 12 is wound conveniently and efficiently. After the circular annular iron core cake 12 with a good winding effect is efficiently manufactured, the circular annular iron core cake 12 can be deformed into the square annular iron core cake 14 only by once reshaping, and a plurality of square annular iron core cakes 14 for stacking and manufacturing the single-frame iron core 10 can be conveniently and efficiently obtained.

In another embodiment of the present invention, a method for manufacturing a transformer core is further provided, which is different from the method for manufacturing a transformer core in the above embodiments in that the standby strip 13 is directly wound into the square ring-shaped core cake 14, so as to reduce the number of processes and cost. In addition, other steps in any of the above embodiments can be applied to this embodiment, and the following description mainly refers to differences.

Specifically, the method for manufacturing the transformer core provided by the embodiment includes the following steps:

step S210, preparing a plurality of groups of iron core cake groups, wherein each group of iron core cake groups comprises a plurality of square annular iron core cakes 14 which are formed by directly winding standby strip materials 13;

step S230, a plurality of square ring-shaped iron core cakes 14 in each group of iron core cake groups are stacked to form a single-frame iron core 10, so as to prepare a plurality of single-frame iron cores 10 by a plurality of groups of iron core cake groups;

step S250, a plurality of single-frame iron cores 10 are spliced to form the transformer iron core 100 with the iron core column 30, and referring to fig. 3-4, the obtained transformer iron core 100 is shown in the figure.

When the transformer core 100 is manufactured, the standby strip 13 is directly wound into the square ring-shaped core cake 14 through the square die, then a plurality of square ring-shaped core cakes 14 cakes can be stacked to form the single-frame core 10, and finally, the plurality of single-frame cores 10 are spliced to form the transformer core 100 with the core column 30. Therefore, the radial size of the iron core cake is in direct proportion to the number of turns of the wound standby strip 13, the more the number of turns of the wound standby strip 13 is, the larger the radial size of the iron core cake is, and finally, the height of the single-frame iron core 10 formed by stacking the plurality of iron core cakes is higher, so that the large-size amorphous alloy transformer iron core 100 can be prepared, the size of the amorphous alloy transformer iron core 100 is not limited by the width of the strip any more, and the manufacturing difficulty of the large-size amorphous alloy transformer iron core 100 is greatly reduced. In addition, in the manufacturing method of the transformer core 100, the standby strip 13 is directly wound into the square ring-shaped core cake 14, so that the manufacturing processes are reduced, and the processing die and the cost are saved.

In addition, the method for manufacturing the transformer core 100 according to any of the above embodiments of the present invention is not limited to manufacturing a certain type of core, and different types of cores, such as three-phase three-dimensional cores, single-phase planar cores, and three-phase five-column planar cores, can be manufactured by adjusting the sizes of the plurality of core cakes.

Referring to fig. 2-4, fig. 2-4 illustrate a three-phase three-dimensional iron core obtained by the method for manufacturing a transformer iron core according to the present invention.

The three-phase three-dimensional iron core comprises three single-frame iron cores 10 which are in end-to-end butt joint, a hollow cavity 20 is formed by enclosing the three single-frame iron cores 10, a window 11 communicated with the hollow cavity 20 is formed in each single-frame iron core 10, an iron core column 30 is formed by butt joint of every two adjacent single-frame iron cores 10, and the iron core column 30 is used for winding coils. And, each of the single-frame cores 10 includes a plurality of core cakes 12 laminated to each other in a first direction in which the hollow cavities 20 are directed to the windows 11, and each of the core cakes 12 is made of the spare tape 13 wound around the first direction. That is to say, in the process of manufacturing the three-phase three-dimensional iron core, the standby strip 13 is wound to form the square ring-shaped iron core cake 14, then a plurality of square ring-shaped iron core cakes 14 are stacked together to form the single-frame iron core 10, and finally, the three single-frame iron cores 10 are butted to form the three-phase three-dimensional iron core. Each square annular iron core cake 14 is made by winding the spare strip 13, the more the number of turns of the spare strip 13 is, the larger the peripheral size of the square annular iron core cake 14 is, the larger the number of turns of the strip 13 is, the large-size square annular iron core cake 14 can be conveniently made by adjusting the number of the turns of the strip 13, the size of the iron core is not limited, and then the large-size transformer can be conveniently made.

Also, the outer periphery of the core limb 30 is configured in a multi-step shape that is close to a circle, so that the core limb 30 is close to a circle, facilitating winding of a coil on the core limb 30.

Specifically, in a third direction perpendicular to both the second direction in which the hollow cavity 20 extends and the first direction, the inner frame 15 of each square ring-shaped core cake 14 has a first inner frame edge 151, the outer frame 16 of each core has a first outer frame edge 161 sleeved outside the first inner frame edge 151, the plurality of first inner frame edges 151 of the plurality of square ring-shaped core cakes 14 in each single-frame core 10 are arranged in a step shape, and the plurality of first outer frame edges 161 of the plurality of square ring-shaped core cakes 14 in each single-frame core 10 are arranged in a step shape; a plurality of first inner frame edges 151 of a plurality of square annular iron core cakes 14 of two adjacent single-frame iron cores 10 enclose and close a part of the periphery of the iron core column 30, a plurality of first outer frame edges 161 of a plurality of square annular iron core cakes 14 in two adjacent single-frame iron cores 10 enclose and close another part of the periphery of the iron core column 30, which is equivalent to the periphery of the iron core column 30 formed by the step-shaped enclosure of the first inner frame edges 151 and the first outer frame edges 161 of the plurality of single-frame iron cores 10, and the gradient of the step shape is controlled, namely the size difference between the two adjacent square annular iron core cakes 14, so that the periphery of the whole iron core column 30 can be closed to be circular.

Further, along the direction parallel to the second direction, the inner frame 15 of each square ring-shaped iron core cake 14 has a second inner frame edge 153 intersecting with the first inner frame edge 151, the outer frame 16 of each square ring-shaped iron core cake 14 has a second outer frame edge 163 sleeved outside the second inner frame edge 153 and intersecting with the first outer frame edge 161, and each square ring-shaped iron core cake 14 has two sets of second inner frame edges 153 and second outer frame edges 163 respectively distributed on two sides of the window 11 along the direction parallel to the second direction. A plurality of second inner frame limits 153 of a plurality of iron cores in single frame iron core 10 set up the level, or a plurality of second inner frame limits 153 are constructed to be arranged to the crooked arc of keeping away from window 11 along the direction of parallel second direction, and the iron core that so forms is middle or early to keeping away from window 11 and crooked or be the level form, makes window 11 space bigger, is convenient for coil more, increases wire winding space, reduces the holistic height of iron core.

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 invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method for manufacturing a transformer core is characterized by comprising the following steps:

preparing a plurality of groups of iron core cake groups, wherein each group of iron core cake groups comprises a plurality of circular ring-shaped iron core cakes which are formed by winding standby strips;

shaping each circular annular iron core cake in each iron core cake group into a square annular iron core cake;

a plurality of the square ring-shaped iron core cakes in each set of the iron core cake sets are laminated to form a single-frame iron core, so that a plurality of single-frame iron cores are prepared by a plurality of sets of the iron core cake sets;

and splicing a plurality of the single-frame iron cores into a transformer iron core with an iron core column.

2. The method for manufacturing a transformer core according to claim 1, wherein the step of shaping each circular ring-shaped core cake in each group of core cake groups into square ring-shaped core cakes is specifically as follows:

the inner circumference side of the circular annular iron core cake is firstly supported to be square, and then the outer circumference side of the circular annular iron core cake is extruded to be square.

3. The method for manufacturing a transformer core according to claim 2, wherein the step of winding the circular ring-shaped core cake by the standby strip is specifically:

and winding a spare belt material on the first protection ring to form the circular annular iron core cake, and sleeving a second protection ring on the outer periphery of the circular annular iron core cake.

4. The method of manufacturing a transformer core according to claim 3, wherein the material of the backup tape is an amorphous alloy; and/or

The first protection ring and the second protection ring are both made of silicon steel sheets.

5. The method for manufacturing a transformer core according to any one of claims 1 to 4, wherein before the step of stacking a plurality of the square-ring-shaped core cakes in each of the groups of the core cakes to form a plurality of single-frame cores, the method further comprises the steps of:

and annealing the square annular iron core cake.

6. The method of manufacturing a transformer core according to claim 5, wherein after the step of annealing the square-ring-shaped core cake, the method further comprises the steps of:

and curing each square ring-shaped iron core cake by using a first colloid coating.

7. The method for manufacturing the transformer core according to any one of claims 1 to 4, wherein the step of stacking a plurality of the square ring-shaped core cakes in each group of the core cake groups to form a plurality of single-frame cores is specifically:

and two adjacent square annular iron core cakes in each iron core cake group are bonded through a second colloid.

8. The method for manufacturing a transformer core according to any one of claims 1 to 4, wherein after the step of laminating a plurality of the square-ring-shaped core cakes in each of the core cake groups to form a plurality of single-frame cores, the method further comprises the steps of:

and coating and curing each single-frame iron core by using a third colloid.

9. The method for manufacturing a transformer core according to any one of claims 1 to 4, wherein, before the step of preparing a plurality of sets of core-cake sets, each set of the core-cake sets comprising a plurality of circular ring-shaped core-cakes each formed by winding a spare strip material, the method further comprises the steps of:

and slitting the initial strip with wider width to obtain the standby strip with narrower width.

10. A method for manufacturing a transformer core is characterized by comprising the following steps:

preparing a plurality of groups of iron core cake groups, wherein each group of iron core cake groups comprises a plurality of square ring-shaped iron core cakes which are formed by directly winding standby strips;

stacking a plurality of square ring-shaped iron core cakes in each iron core cake group to form a plurality of single-frame iron cores;

and splicing a plurality of the single-frame iron cores to form the transformer iron core with the iron core column.

Images