A transformer core

Abstract

The present invention provides a transformer core. The iron yoke and the column are connected to form the iron core; the iron yoke is formed by stacking iron yoke sheets, the iron yoke sheet includes two first ends and a first main body, the first end is a triangle, and the first main body is a rectangle; the column is formed by stacking column sheets, the column sheet includes two second ends and a second main body, the second end is a triangle, and the second main body is a rectangle; the cross section of the iron yoke along the short axis of the iron yoke sheet is "D" shaped, and the plane part of the iron yoke faces the direction of the column installation; the cross section of the column along the short axis of the column sheet is circular; the iron yoke and the column are connected so that the first end and the second end are overlapped one by one to form the iron core sheet, and the iron core sheets are stacked into the iron core, and the first vertex of the first end and the second vertex of the second end are overlapped to form a stutter angle or a straight angle. The transformer core provided by the present invention has the characteristics of less consumption of raw materials, small iron core angle weight, low hysteresis loss, and small no-load loss.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to a transformer core. Background Art

[0002] The transformer core is mainly composed of two structures: a laminated core and a wound core. Both laminated core and wound core have their advantages and disadvantages.

[0003] The wound core structure transformer has a high yoke magnetic density and has problems such as local overheating. If it is damaged, it is inconvenient to repair and the repair cost is high. The winding efficiency is not as high as that of ordinary laminated core.

[0004] The stacked core structure transformer is a transformer core formed by stacking silicon steel sheets of a certain shape and size. When the core is stacked, each layer has a certain number of oblique seams, and the core must be stacked alternately to form a whole. At the seams of the core, the core magnetic flux passes through adjacent silicon steel sheets to form a closed magnetic circuit, and the local hysteresis loss at the single seam increases. In addition, the stacked core structure transformer in the prior art also has the problem of high material consumption.

[0005] However, the laminated core structure technology is mature, the product design performance is optimized, and it can be mass-produced. The reliability of the product has been verified for many years and is completely mature. Most transformer manufacturers have core equipment and assembly equipment, and the product can be repaired at the local repair factory. The appearance bases of various manufacturers are basically standard gauges and can be interchanged. If the technical problems of the laminated core material consumption, utilization rate, gap separation and other structural problems can be solved, it will still have strong market competitiveness. Summary of the invention

[0006] The invention provides a transformer core, which is used to solve the problems of large consumption of core material, low utilization rate and large separation loss of a stacked core transformer.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A transformer core is provided, the core comprising: an iron yoke and a column, wherein the iron yoke and the column are connected to form the core;

[0009] The iron yoke is formed by stacking iron yoke pieces, and the iron yoke pieces include two first end heads and a first main body portion, the first end heads are triangular, and the first main body is rectangular;

[0010] The column is formed by stacking column pieces, and the column piece includes two second end heads and a second main body part, the second end heads are triangular, and the second main body is rectangular;

[0011] The cross section of the iron yoke along the direction of the short axis of the iron yoke piece is "D" shaped, and the plane part of the iron yoke faces the direction in which the column is installed;

[0012] The cross section of the column along the direction of the short axis of the column piece is circular;

[0013] The iron yoke and the column are connected so that the first end and the second end are overlapped one by one to form iron core sheets, and the iron core sheets are stacked into an iron core. The first vertex angle of the first end and the second vertex angle of the second end are overlapped to form a stuttered angle or a straight angle.

[0014] Preferably, the iron yoke piece is asymmetric along the long axis of the iron yoke piece.

[0015] Preferably, the iron yoke piece is symmetrical along the short axis of the iron yoke piece.

[0016] Preferably, the column piece is asymmetric along the long axis of the column piece.

[0017] Preferably, the column piece is centrosymmetrical.

[0018] Preferably, the first vertex angle is 30° to 90°.

[0019] Preferably, the second vertex angle is 30° to 90°.

[0020] Preferably, the first bodies have different minor axis widths and the corresponding second bodies have different minor axis widths.

[0021] Preferably, a triangular opening is provided on the first main body of the iron yoke piece, and the triangular opening and the second end of the column piece having the same minor axis width as the iron yoke piece have the same shape.

[0022] Based on the above embodiments, it can be seen that the embodiments of the present invention provide a transformer core. The core includes: an iron yoke and a column; the iron yoke is formed by stacking iron yoke sheets, the iron yoke sheet includes two first ends and a first main body, the first end is a triangle, and the first main body is a rectangle; the column is formed by stacking column sheets, the column sheet includes two second ends and a second main body, the second end is a triangle, and the second main body is a rectangle; the cross section of the iron yoke along the direction of the short axis of the iron yoke sheet is "D" shaped; the cross section of the column along the direction of the short axis of the column sheet is circular; the iron yoke is connected to the column to form an iron core, and the plane part of the iron yoke faces the direction of the column; the iron yoke is connected to the column so that the first end and the second end are overlapped one by one, and the first vertex angle of the first end and the second vertex angle of the second end are overlapped to form a straight angle or a flat angle. The triangular ends of the iron yoke pieces are equivalent to cutting the four right-angle parts of the four-corner iron core, reducing the iron core corner weight and the consumption of raw materials; the triangular ends of the iron yoke pieces are connected, the length of the joints is reduced, and the difference between the cross-sectional area of ​​the corner joint area and the cross-sectional area of ​​the core column and the iron yoke is reduced, which reduces the hysteresis loss and thus reduces the no-load loss of the transformer.

[0023] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A schematic diagram of an iron yoke sheet provided in an embodiment of the present invention;

[0026] Figure 2 A schematic cross-sectional view of an iron yoke provided in an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of a column sheet provided in an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of a column cross section provided by an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of splicing an iron yoke sheet and a column sheet provided in an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of stacking two layers of iron yoke sheets and two layers of column sheets provided in an embodiment of the present invention;

[0031] Figure 7 A dimension diagram of each iron yoke piece of an iron yoke cross section provided in an embodiment of the present invention;

[0032] Figure 8 A schematic diagram of the dimensions of each column slice in a column cross section provided in an embodiment of the present invention;

[0033] Fig. 9 Another schematic diagram of stacking iron yoke sheets and column sheets provided in an embodiment of the present invention.

[0034] Explanation of reference numerals: 1- iron yoke, 11- iron yoke sheet, 111- first end, 1111- first vertex, 112- first body, 2- column, 21- column sheet, 211- second end, 2111- second vertex, 212- second body, 3- triangular opening, 4- iron core sheet. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of this application.

[0036] Figure 1 A schematic diagram of an iron yoke sheet provided in an embodiment of the present invention, such as Figure 1 As shown, the iron yoke piece 11 includes two first end heads 111 and a first main body 112, the first end head 111 is a triangle, and the first main body 112 is a rectangle. The two opposite sides of the first main body 112 are respectively connected to the first end head 111. It should be noted that the connection here does not mean that the first end head 111 and the first main body 112 are spliced ​​together, but the two parts are integrally formed. Preferably, the two edges of the first end head 111 that are not connected to the first main body 112 are asymmetric along the long axis of the iron yoke piece 11, so as to obtain an asymmetric iron yoke piece 11, that is, the iron yoke piece 11 is an asymmetric structure along the long axis direction of the iron yoke piece 11, but the iron yoke piece 11 has a symmetrical structure along the short axis of the iron yoke piece 11. The angle between the first end head 111 and the first main body 112 is the first vertex angle 1111, and the angle range of the first vertex angle 1111 is 30° to 90°.

[0037] Figure 2 A schematic cross-sectional view of an iron yoke provided in an embodiment of the present invention, such as Figure 2 As shown, the iron yoke 1 is formed by stacking iron yoke pieces 11. When stacking, different types of iron yoke pieces 11 are selected. The lengths of the long axis direction of the iron yoke pieces 11 of different types are the same, the angles of the first vertex 1111 at both ends are the same, and the widths of the short axes of the iron yoke pieces 11 are different. During the stacking process, the iron yoke pieces 11 with a larger width are stacked from the middle position to a certain thickness, and then the narrower iron yoke pieces 11 are selected and arranged symmetrically on both sides in sequence. It should be noted that Figure 2 Only the stacking of the largest iron yoke piece 11 in the middle is shown, and the stacking of both sides is done in the same way. Figure 2 They are not drawn one by one. Theoretically, the best magnetic flux will be obtained when the cross section of the iron yoke 1 along the short axis of the iron yoke sheet 11 is circular. However, the coil wound on the column 2 should be compressed. Therefore, the cross section of the iron yoke 1 along the short axis of the iron yoke sheet 11 is "D" shaped, which is equivalent to translating the middle part of the iron yoke sheet 11 downward on the basis of the circular cross section so that a part of the arc surface is transformed into a plane. The "D" shaped yoke structure with an enlarged cross section is adopted to reduce the magnetic flux density in the iron yoke 1 and reduce the no-load loss; the contact area between the end of the iron yoke 1 and the coil pressure plate is increased to improve the transformer's ability to resist short circuits.

[0038] Figure 3 A schematic diagram of a column sheet provided by an embodiment of the present invention, such as Figure 3 As shown, the column piece 21 includes two second end heads 211 and a second main body 212, the second end head 211 is a triangle, and the second main body 212 is a rectangle. The two opposite sides of the second main body 212 are respectively connected to the second end head 211. It should be noted that the connection here does not mean that the second end head 211 and the second main body 212 are spliced ​​together, but the two parts are integrally formed. Preferably, the two edges of the second end head 211 that are not connected to the second main body 212 are asymmetric along the long axis direction of the column piece 21, so as to obtain an asymmetric column piece 21, that is, the column piece 21 is an asymmetric structure along the long axis of the column piece 21, but the column piece 21 has a central symmetric structure. The angle between the second end head 211 and the second main body 212 is the second vertex angle 2111, and the angle range of the second vertex angle 2111 is 30° to 90°.

[0039] Figure 4 A schematic diagram of a column cross section provided by an embodiment of the present invention, such as Figure 4 As shown, the column 2 is formed by stacking column pieces 21. Different types of column pieces 21 are selected for stacking. The column pieces 21 of different types have the same length in the long axis direction, the same angles of the second vertex 2111 at both ends, and different widths of the short axis of the column pieces 21. During the stacking process, the column piece 21 with a larger width is stacked from the middle position to a certain thickness, and then the narrower column pieces 21 are selected and arranged symmetrically on both sides in sequence, and finally the cross section of the column 2 along the short axis direction of the column piece 21 is formed to be circular. It should be noted that Figure 4 Only the stacking of the largest column piece 21 in the middle is shown, and the stacking of the two sides is also performed. Figure 4 Not all of them are drawn here.

[0040] Figure 5 A schematic diagram of splicing an iron yoke sheet and a column sheet provided in an embodiment of the present invention, such as Figure 5 As shown, the first end 111 and the second end 211 are overlapped one by one to form the core sheet 4, and the first vertex 1111 of the first end 111 and the second vertex 2111 of the second end 211 are overlapped to form a stuttered angle or a straight angle.

[0041] Figure 6 A schematic diagram of stacking two layers of iron yoke sheets and two layers of column sheets provided in an embodiment of the present invention, as shown in FIG. Figure 6As shown, the joint between the first layer of core sheets 4 and the second layer of core sheets 4 is formed by stacking the iron yoke sheets 11 and the column sheets 21 on the core. The process is as follows: first, the iron yoke sheets 11 and the column sheets 21 of the same level (with the same short axis width) are selected to be spliced ​​into the core sheets 4. The shape of the core sheets 4 is a common shape in the market; then the iron yoke sheets 11 are flipped along the long axis direction of the iron yoke sheets 11 and the column sheets 21 are flipped along the long axis direction of the column sheets 21. Because the iron yoke sheets 11 and the column sheets 21 are asymmetric along the long axis direction, the second layer will press the first joint so that the joints do not overlap, and the morphology forms an embedded iron yoke 1 assembly form. And so on, the assembly of the core is finally completed.

[0042] Figure 7 A dimension diagram of each iron yoke piece of an iron yoke cross section provided in an embodiment of the present invention, Figure 8 A schematic diagram of the dimensions of each column slice in a column cross section provided by an embodiment of the present invention, such as Figure 7 and Figure 8 As shown, according to the different sizes of the iron core, iron yoke sheets 11 and column sheets 21 of different sizes are produced. The iron yoke sheets 11 and column sheets 21 of the same layer of iron core sheets 4 have the same number of levels, and the total number of stacked iron yoke sheets 11 and column sheets 21 of each level is the same, forming a certain thickness. The thickness of the stacked iron yoke sheets 11 and column sheets 21 of each level is determined according to the size of the iron core and the requirements for the performance of the iron core. For example, when the iron core is larger or the requirements for the performance of the iron core are higher, the number of stacked iron yoke sheets 11 and column sheets 21 of each level is smaller, and the more levels of iron yoke sheets 11 and column sheets 21 are used, that is, the arc surfaces of the iron yoke 1 and column 2 are made as smooth as possible.

[0043] Depending on the shape of the core, some cores do not have intermediate columns, but most cores are provided with different numbers of intermediate columns as required. To meet market demand, the present application provides a preferred core structure. Fig. 9 Another schematic diagram of stacking iron yoke sheets and column sheets provided in an embodiment of the present invention is as follows: Fig. 9 As shown, the first body 112 of the iron yoke piece 11 is provided with a triangular opening 3, which has the same shape as the second end 211 of the column piece 21 having the same minor axis width as the iron yoke piece 11. In this way, the center column can be directly installed at the position of the triangular opening 3.

[0044] The embodiments in this specification are described in a progressive manner. The same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0045] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention invented herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary techniques in the art not described in the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

[0046] It should be noted that, unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in the relevant fields, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or device including the elements. Relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0047] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A transformer core, characterized in that: The core includes: An iron yoke (1) and a column (2), wherein the iron yoke (1) and the column (2) are connected to form an iron core; The iron yoke (1) is formed by stacking iron yoke pieces (11) of different models, the iron yoke pieces (11) of different models have the same length in the long axis direction, the same angle of the first vertex angles (1111) at both ends, and different widths in the short axis direction, the iron yoke piece (11) comprises two first end heads (111) and a first main body (112), the first end heads (111) are triangular, and the first main body (112) is rectangular; The column (2) is formed by stacking column pieces (21) of different models, the column pieces (21) of different models have the same length in the long axis direction, the same angles of the second vertex angles (2111) at both ends, and different widths in the short axis direction, the column piece (21) comprises two second end heads (211) and a second main body (212), the second end heads (211) are triangular, and the second main body (212) is rectangular; The cross section of the iron yoke (1) along the direction of the short axis of the iron yoke sheet (11) is in a "D" shape, and the plane portion of the iron yoke (1) faces the direction in which the column (2) is installed; The cross section of the column (2) along the direction of the short axis of the column piece (21) is circular; The iron yoke (1) and the column (2) are connected so that the first end (111) and the second end (211) are overlapped in a one-to-one correspondence to form iron core sheets (4), the iron core sheets (4) are stacked to form an iron core, and a first vertex (1111) of the first end (111) and a second vertex (2111) of the second end (211) are overlapped to form an obtuse angle; The iron yoke piece (11) is asymmetric along the long axis of the iron yoke piece (11); and the iron yoke piece (11) is symmetric along the short axis of the iron yoke piece (11).

2. The transformer core according to claim 1, characterized in that: The column piece (21) is asymmetric along the long axis of the column piece (21).

3. The transformer core according to claim 2, characterized in that: The column piece (21) is centrally symmetrical.

4. The transformer core according to claim 1, characterized in that: The first vertex angle (1111) is between 30° and 90°.

5. The transformer core according to claim 1, characterized in that: The second vertex angle (2111) is between 30° and 90°.

6. The transformer core according to claim 1, characterized in that: A triangular opening (3) is provided on the first body (112) of the iron yoke piece (11), and the triangular opening (3) and a second end (211) of a column piece (21) having the same minor axis width as the iron yoke piece (11) have the same shape.

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