Iron core unit, three-phase three-dimensional transformer apple yoke laminated iron core and transformer

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By adopting the stacked structure of an apple-shaped iron yoke and semicircular side column and the outer clamping and inner support structure, the problems of unstable cores, many consumables and high losses in traditional transformers are solved, and a more efficient and economical transformer design is achieved.

CN222801543UActive Publication Date: 2025-04-25HEFEI TIANWEI ZHONGYUAN ELECTRICAL CO LTD +1

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Patent Information

Application Number: CN202421629190.9
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-07-11
Publication Date: 2025-04-25
Estimated Expiration: 2034-07-11

AI Technical Summary

Technical Problem

The existing planar stacked iron core transformers have problems such as three-phase magnetic circuit imbalance, many consumables and high losses, while the three-dimensional coiled iron core transformers have large sizes, many consumables, long production cycles, high manufacturing costs and difficult to maintain.

Method used

The core unit is formed by stacking and a semicircular side column through isosceles trapezoidal silicon steel sheets. The core unit is spliced through multi-step oblique joints to form a rectangular core. The side columns of the three sets of core units are connected to each other. The apple-shaped iron yoke is distributed in an equilateral triangle and is clamped by an outer clamping and inner support structure.

Benefits of technology

The stability and mechanical strength of the core unit are improved, the overall height and material cost of the transformer are reduced, the loss is reduced, the energy-saving effect is improved, and the manufacturing process is simplified.

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Abstract

The utility model discloses an iron core unit, a three-phase three-dimensional transformer apple yoke laminated iron core and a transformer, isosceles trapezoid silicon steel sheets are laminated step by step to form the iron core unit with two semicircular side column sections and two apple-shaped iron yoke sections, and the whole iron core unit is reliable and excellent in performance. The defects that a three-phase magnetic circuit of a traditional planar laminated iron core transformer is unbalanced, consumables are large, loss is high, and a three-dimensional wound iron core yoke is large in size, consumables are large, the manufacturing period is long, and manufacturing cost is high can be overcome. According to the apple yoke laminated iron core of the three-phase three-dimensional transformer, the side columns of the three groups of iron core units are in butt joint with one another, so that the apple-shaped iron yokes of the three groups of iron core units are distributed in an equilateral triangle shape, the overall height size of the iron core and the transformer can be reduced, and the material cost is reduced; the outer contour is round and smooth, the partial discharge fault can be avoided, the harmonic magnetic flux influence is reduced, the loss is reduced, the energy-saving effect is improved, and the application prospect is extremely wide.

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Description

Technical Field

[0001] The utility model relates to the technical field of transformer manufacturing, in particular to an iron core unit, a three-phase three-dimensional transformer apple yoke stacked iron core and a transformer. Background Art

[0002] The core is one of the core components of the transformer, and the core structure directly determines the overall structure and economic and technical performance of the transformer. However, the existing traditional planar stacked core has an unbalanced three-phase magnetic circuit, many consumables, and high losses; the three-dimensional wound core has a large yoke size, many consumables, a long production cycle, high manufacturing costs, and is difficult to maintain, which cannot meet the current power transformer's increasingly high performance requirements for material saving, energy efficiency, low carbon and environmental protection, safe and reliable operation, etc. Utility Model Content

[0003] The purpose of the utility model is to provide a core unit, a three-phase three-dimensional transformer apple yoke stacked core and a transformer, so as to solve the problems of unbalanced three-phase magnetic circuit, large consumables, high loss, large size of three-dimensional wound core yoke, large consumables, long production cycle and high manufacturing cost of traditional planar stacked core transformers.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] The utility model provides an iron core unit, comprising two apple-shaped iron yokes arranged in parallel and two semicircular side columns arranged in parallel, wherein the two apple-shaped iron yokes and the two semicircular side columns are spliced to form a closed rectangular iron core unit; wherein:

[0006] The semicircular side column is formed by stacking a plurality of isosceles trapezoidal silicon steel sheets layer by layer, and the cross section of the semicircular side column is semicircular;

[0007] The apple-shaped iron yoke is formed by stacking a plurality of tapered trapezoidal silicon steel sheets and a plurality of isosceles trapezoidal silicon steel sheets alternately and layer by layer, and the cross section of the apple-shaped iron yoke is apple-shaped; the tapered trapezoidal silicon steel sheet is a structure in which a bottom corner is cut off from the isosceles trapezoidal silicon steel sheet;

[0008] The joints between the semicircular side columns and the apple-shaped iron yoke form multi-step stepped oblique joints.

[0009] Preferably, the widths of the first and last trapezoidal silicon steel sheets in the apple-shaped iron yoke are respectively greater than the widths of the first and last trapezoidal silicon steel sheets in the semicircular side columns.

[0010] Preferably, the maximum width of the trapezoidal silicon steel sheets in the apple-shaped iron yoke is smaller than the maximum width of the trapezoidal silicon steel sheets in the semicircular side columns.

[0011] Preferably, the cross-sectional area of the apple-shaped iron yoke is 1.1 to 1.16 times the cross-sectional area of the semicircular side column.

[0012] Preferably, the outer side surfaces of the first-stage silicon steel sheets and the last-stage silicon steel sheets of the semicircular side column are respectively provided with an outer pull plate and an inclined pull plate, and an insulating structure is provided between the outer pull plate and the adjacent silicon steel sheet, and between the inclined pull plate and the adjacent silicon steel sheet; the outer side surfaces of the first-stage silicon steel sheets and the last-stage silicon steel sheets of the apple-shaped iron yoke are respectively provided with an outer clamp and an inlaid clamp, and an insulating structure is provided between the outer clamp and the adjacent silicon steel sheet, and between the inlaid clamp and the adjacent silicon steel sheet;

[0013] The outer clamp and the inlaid clamp are both connected to the apple-shaped iron yoke;

[0014] Both ends of any one of the outer pull plates are fixedly connected to the two outer clamps of the two apple-shaped iron yokes respectively;

[0015] The two ends of any one of the inclined pull plates are respectively connected to the two inlaid clamps of the two apple-shaped iron yokes.

[0016] Preferably, positioning holes are provided on the isosceles trapezoidal silicon steel sheets at any level of the apple-shaped iron yoke, and bolts are sequentially passed through the outer clamp, the positioning holes on the isosceles trapezoidal silicon steel sheets at each level, and the inlaid clamp, and then connected to the fastening structure to achieve the connection between the outer clamp, the inlaid clamp and the apple-shaped iron yoke.

[0017] Preferably, the two apple-shaped iron yokes are arranged in parallel up and down; an upper yoke support plate and a pull strap are provided on the upper apple-shaped iron yoke to realize the connection between the outer clamp and the inlaid clamp and the upper apple-shaped iron yoke, and to fasten the upper apple-shaped iron yoke into shape; a lower yoke pad and a pull strap are provided on the lower apple-shaped iron yoke to realize the connection between the outer clamp and the inlaid clamp and the lower apple-shaped iron yoke, and to fasten the lower apple-shaped iron yoke into shape.

[0018] The utility model also proposes a three-phase three-dimensional transformer apple-yoke stacked core, comprising three groups of core units as described above, the semicircular side columns of the three groups of core units are butted end to end in sequence, the apple-shaped iron yokes at both ends of the three groups of core units are enclosed to form an equilateral triangle, the semicircular side columns of any two adjacent core units are butted together to form a core column with a circular cross-section; the outer clamps of any two adjacent core units are connected and fixed by a clamping device.

[0019] Preferably, the inner rings of the three groups of core units are further provided with inner tightening devices, and the inner tightening devices can tighten the core units from the inside to the outside.

[0020] The utility model also provides a transformer, comprising the three-phase stereo transformer apple yoke laminated core described in any one of the above items.

[0021] Compared with the prior art, the utility model has achieved the following technical effects:

[0022] The core unit proposed in the utility model adopts isosceles trapezoidal silicon steel sheets to be stacked step by step to form two side column cross-sections of semicircular core units and two iron yoke cross-sections of apple-shaped core units. The whole core unit has a stable and exquisite structure, reliable and excellent performance, simple and efficient manufacturing, and can eliminate the shortcomings of traditional flat stacked core transformers such as unbalanced three-phase magnetic circuit, large consumables, high loss, and large size of three-dimensional wound core yokes, large consumables, long production cycle, and high manufacturing cost. The outer contour of the apple-shaped iron yoke is round and has the characteristics of good electrical characteristics, high safety and reliability, compact overall structure, small size, material saving, simple processing, short production cycle, high economic benefit, low loss, high efficiency and energy saving, and small carbon footprint, and is very suitable for the green manufacturing trend of low-carbon cycle.

[0023] The three-phase three-dimensional transformer apple yoke stacked core proposed in the utility model adopts the side columns of three groups of core units to be connected to each other, so that the apple-shaped iron yokes of the three groups of core units are distributed in an equilateral triangle, and then the trapezoidal silicon steel sheets of each layer of the core unit can be reliably clamped through a special outer clamp and inner support structure. The main advantages of the above-mentioned three-phase three-dimensional transformer apple yoke stacked core are reflected in: first, it reduces the overall height of the core and the transformer and effectively reduces the material cost; second, the iron yoke adopts an apple-shaped cross-section, the outer contour is round and smooth, the electric field strength is uniform, and local discharge failures can be avoided; third, the clamping degree of the iron yoke is enhanced, and the overall stability and mechanical strength of the iron core are improved; fourth, the sheet types are few and simple, the manufacturing cycle is short, and the production efficiency is high; fifth, the iron yoke cross-section is optimized, which can reduce the influence of harmonic magnetic flux, reduce losses, and improve energy-saving effects, and has extremely broad application prospects.

[0024] The transformer proposed in the utility model includes the above-mentioned three-phase three-dimensional transformer apple yoke laminated core, and has all the characteristics of the above-mentioned three-phase three-dimensional transformer apple yoke laminated core, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a top view structural schematic diagram of the apple yoke laminated core of the three-phase stereo transformer disclosed in the utility model;

[0027] Figure 2 It is a structural schematic diagram of the iron core unit in the apple yoke laminated iron core of the three-phase stereo transformer disclosed by the utility model;

[0028] Figure 3 for Figure 2 A top view of

[0029] Figure 4 for Figure 2 AA section structure diagram of the apple-shaped iron yoke;

[0030] Figure 5 It is a structural schematic diagram of an iron core column in an apple yoke laminated iron core of a three-phase stereo transformer disclosed in the utility model;

[0031] Figure 6 It is a structural schematic diagram of the inclined pull plate disclosed in the utility model;

[0032] Figure 7 It is a structural schematic diagram of the inlaid clamp disclosed in the utility model;

[0033] Figure 8 It is a structural schematic diagram of a medium waist trapezoidal silicon steel sheet in the core unit disclosed in the utility model;

[0034] Fig. 9 It is a schematic structural diagram of a trapezoidal silicon steel sheet with a sharp corner in a core unit disclosed in the utility model;

[0035] Fig.10 It is a structural schematic diagram of an isosceles trapezoidal silicon steel sheet with holes in the core unit disclosed in the utility model;

[0036] Fig.11 It is a structural schematic diagram of a trapezoidal silicon steel sheet with holes and sharp corners in the core unit disclosed in the utility model;

[0037] Fig.12 It is a schematic cross-sectional view of the inclined pull plate of the utility model.

[0038] In the figure, the reference numerals are:

[0039] 100. Three-phase stereo transformer apple yoke laminated core;

[0040] 1. Core unit; 101. Semicircular side column; 102. Apple-shaped iron yoke; 103. Upper yoke support plate and drawstring; 104. External clamp; 105. External draw plate; 106. Inclined draw plate; 107. Inlaid clamp; 108. Lower yoke pad and drawstring; 109. Isosceles trapezoidal silicon steel sheet; 110. De-sharpened trapezoidal silicon steel sheet; 111. Isosceles trapezoidal silicon steel sheet with holes; 112. De-sharpened trapezoidal silicon steel sheet with holes;

[0041] 2. Clamping device;

[0042] 3. Insulation partition;

[0043] 4. The center column has oblique pads;

[0044] 5. Internal tightening device;

[0045] 6. Iron core column. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0048] Embodiment 1

[0049] like Figure 2 to Figure 4 As shown, this embodiment provides a core unit 1, which includes two apple-shaped iron yokes 102 and two semicircular side columns 101, as shown in FIG. Figure 2 As shown, two apple-shaped iron yokes 102 are arranged in parallel up and down, and two semicircular side columns 101 are arranged in parallel left and right. The two apple-shaped iron yokes 102 and the two semicircular side columns 101 enclose a closed rectangular iron core unit. Among them, the cross-sectional shapes of the apple-shaped iron yokes 102 and the semicircular side columns 101 are different. The cross-sectional shape of the apple-shaped iron yoke 102 is as follows: Figure 4 The apple shape shown in the figure means that the cross section of the apple-shaped iron yoke 102 is first symmetrically opened and then symmetrically contracted, and the overall cross section is shaped like an apple; the cross section of the semicircular side column 101 is semicircular. When multiple core units 1 are combined and spliced for use, two adjacent core units 1 can be spliced through the semicircular side column 101 to form a core column 6 with a circular cross section.

[0050] Specifically, in this embodiment, the two semicircular side columns 101 of the core unit 1 have the same structure. Taking one group as an example, the semicircular side column 101 is preferably composed of Figure 8 The isosceles trapezoidal silicon steel sheets 109 are stacked layer by layer. The width of the trapezoidal silicon steel sheets is characterized by the height length of each trapezoidal silicon steel sheet. In the semicircular side column 101, the widths of the trapezoidal silicon steel sheets at each level are not completely the same or completely different. Trapezoidal silicon steel sheets of corresponding width can be set at each level as needed. Figure 3The semicircular cross section in the dotted circle is formed by stacking isosceles trapezoidal silicon steel sheets 109 of different widths in a step-by-step manner. The width of the isosceles trapezoidal silicon steel sheet 109 is characterized by its height line length.

[0051] Specifically, in this embodiment, the two apple-shaped iron yokes 102 have the same structure. Taking one group as an example, the apple-shaped iron yoke 102 is preferably formed by alternately stacking a tapered trapezoidal silicon steel sheet 110 and an isosceles trapezoidal silicon steel sheet 109. The tapered trapezoidal silicon steel sheet 110 is a structure in which a bottom corner is cut off from the isosceles trapezoidal silicon steel sheet 109. Figure 8 and Fig. 9 As shown, the edge of the position where the sharp corners of the de-sharpened trapezoidal silicon steel sheet 110 are cut off is parallel to the high line of the de-sharpened trapezoidal silicon steel sheet 110 (the "high line" here is the high line in the traditional trapezoidal structure). The width of the trapezoidal silicon steel sheet is characterized by the high line length of each trapezoidal silicon steel sheet. In order to form the apple-shaped iron yoke 102, Figure 4 In the apple-shaped cross-section shown, the widths of the trapezoidal silicon steel sheets at each level are not exactly the same, and trapezoidal silicon steel sheets of corresponding width can be arranged at each level as needed.

[0052] In the same core unit 1, the isosceles trapezoidal silicon steel sheets 109 used in each semicircular side column 101, and the tapered trapezoidal silicon steel sheets 110 and isosceles trapezoidal silicon steel sheets 109 used in each apple-shaped iron yoke 102, have the same thickness, and the total number of stacked silicon steel sheets in any semicircular side column 101 is the same as the total number of stacked silicon steel sheets in any apple-shaped iron yoke 102. Based on this, the silicon steel sheets in each apple-shaped iron yoke 102 and each semicircular side column 101 correspond to each other layer by layer, that is, the core unit 1 as a whole is a laminated core formed by stacking multiple layers of structures, and any layer of structure is spliced by four trapezoidal silicon steel sheets, and the four trapezoidal silicon steel sheets in each layer are all multi-step stepped bevel joints at the head and tail corners. It should be noted that the four trapezoidal silicon steel sheets in any layer of the core unit 1 come from the corresponding layers of trapezoidal silicon steel sheets of two apple-shaped iron yokes 102 and two semicircular side columns 101. During the preparation of the core unit 1 , they are generally stacked layer by layer, and the four trapezoidal silicon steel sheets in each layer come from the corresponding layers of trapezoidal silicon steel sheets of the two apple-shaped iron yokes 102 and the two semicircular side columns 101 .

[0053] Furthermore, in this embodiment, the width of the first and last trapezoidal silicon steel sheets in the apple-shaped iron yoke 102 is preferably greater than the width of the first and last trapezoidal silicon steel sheets in the semicircular side column 101, and the maximum sheet width in the apple-shaped iron yoke 102 is smaller than the maximum sheet width in the semicircular side column 101, so as to effectively compress the height dimension of the apple-shaped iron yoke 102 and appropriately reduce the overall height dimension of the core unit 1. At the same time, the width dimensions of the trapezoidal silicon steel sheets in the apple-shaped iron yoke 102 and the semicircular side column 101 are optimized so that the cross-sectional area of the apple-shaped iron yoke 102 (such as Figure 4 The cross-sectional area of the shape shown) is 1.1 to 1.16 times the cross-sectional area of the semicircular side column 101, so as to optimize and adjust the cross-sectional area of the apple-shaped iron yoke 102, solve the problem of harmonic magnetic flux of the iron yoke, improve the performance of the core unit, and reduce the loss value.

[0054] In this embodiment, the outer side surfaces of the first-stage silicon steel sheet and the last-stage silicon steel sheet of the semicircular side column 101 are respectively provided with an outer pull plate 105 and an inclined pull plate 106, and an insulating structure is provided between the outer pull plate 105 and the adjacent silicon steel sheet, and between the inclined pull plate 106 and the adjacent silicon steel sheet; the outer side surfaces of the first-stage silicon steel sheet and the last-stage silicon steel sheet of the apple-shaped iron yoke 102 are respectively provided with an outer clamp 104 and an inlaid clamp 107, and an insulating structure is provided between the outer clamp 104 and the adjacent silicon steel sheet, and between the inlaid clamp 107 and the adjacent silicon steel sheet. The aforementioned insulating structures can all be insulating gaskets.

[0055] In this embodiment, two apple-shaped iron yokes 102 are arranged in parallel up and down, and two semicircular side columns 101 are arranged in parallel left and right. The outer clamps 104 and the inlaid clamps 107 are both connected to the apple-shaped iron yokes 102, and the two ends of any outer pull plate 105 are respectively fixedly connected to the two outer clamps 104 of the two apple-shaped iron yokes 102 by bolts or the like, and the two outer pull plates 105 and the two outer clamps 104 can be spliced to form a rectangular frame; the two ends of any inclined pull plate 106 are respectively connected to the two inlaid clamps 107 of the two apple-shaped iron yokes 102.

[0056] Specifically, in the present embodiment, positioning holes may be provided on any level of the isosceles trapezoidal silicon steel sheets of the apple-shaped iron yoke 102. Bolts are sequentially passed through the outer clamp 104, the positioning holes on each level of the isosceles trapezoidal silicon steel sheets, and the inlaid clamp 107, and then connected to a fastening structure (such as a nut), thereby enabling the connection between the outer clamp 104 and the inlaid clamp 107 and the apple-shaped iron yoke 102. It should be noted that when the apple-shaped iron yoke 102 needs to be provided with a trapezoidal silicon steel sheet with positioning holes, the isosceles trapezoidal silicon steel sheets 111 with holes and the trapezoidal silicon steel sheets 112 with holes and sharpened corners are alternately stacked step by step to form the apple-shaped cross-section of the apple-shaped iron yoke 102. Fig.10 As shown, compared with the isosceles trapezoidal silicon steel sheet 109, the perforated isosceles trapezoidal silicon steel sheet 111 has two positioning holes opened on the steel plate. Fig.11As shown, the perforated trapezoidal silicon steel sheet 112 is a structure in which a bottom corner is cut off on the basis of the perforated isosceles trapezoidal silicon steel sheet 111, and the edge of the position where the sharp corner is cut off of the perforated trapezoidal silicon steel sheet 112 is parallel to the high line of the perforated trapezoidal silicon steel sheet 112 (the "high line" here is the high line in the traditional trapezoidal structure). In the apple-shaped iron yoke 102, the width settings of the perforated isosceles trapezoidal silicon steel sheet 111 and the perforated trapezoidal silicon steel sheet 112 at different levels are the same as those of the aforementioned trapezoidal silicon steel sheet 110 and the isosceles trapezoidal silicon steel sheet 109, which will not be repeated here.

[0057] In addition to the above-mentioned fixing method, the outer clamp 104 and the inlaid clamp 107 can be connected to the apple-shaped iron yoke 102 in the following manner: an upper yoke support plate and a pull strap 103 are provided on the upper apple-shaped iron yoke 102 to realize the binding connection between the outer clamp 104 and the inlaid clamp 107 and the upper apple-shaped iron yoke 102, and the upper yoke support plate and the pull strap 103 also play a role in fastening and forming the upper apple-shaped iron yoke 102; a lower yoke pad and a pull strap 108 are provided on the lower apple-shaped iron yoke 102 to realize the binding connection between the outer clamp 104 and the inlaid clamp 107 and the lower apple-shaped iron yoke 102, and the lower yoke pad and the pull strap 108 also play a role in fastening and forming the lower apple-shaped iron yoke 102. By adopting the above-mentioned fixing method of the upper yoke support plate and pull strap 103 and the lower yoke pad and pull strap 108, the apple-shaped iron yoke 102 can be directly formed by alternately stacking layer by layer the sharpened trapezoidal silicon steel sheets 110 without positioning holes and the isosceles trapezoidal silicon steel sheets 109.

[0058] In addition, the fixing method of the upper yoke support plate and drawstring 103 and the lower yoke pad and drawstring 108 can be used in combination with the aforementioned method of sequentially penetrating the outer clamp 104, the positioning holes on the isosceles trapezoidal silicon steel sheets at various levels, and the inlaid clamp 107 with bolts and then connecting with a fastening structure (such as a nut), that is, after sequentially penetrating the outer clamp 104, the positioning holes on the isosceles trapezoidal silicon steel sheets at various levels, and the inlaid clamp 107 with bolts and then connecting with a fastening structure such as a nut, the upper yoke support plate and drawstring 103 can be set on the upper apple-shaped iron yoke 102, and the lower yoke pad and drawstring 108 can be set on the lower apple-shaped iron yoke 102. The bolts, the upper yoke support plate and drawstring 103, and the lower yoke pad and drawstring 108 are all detachable connectors, and the specific usage method can be flexibly adjusted according to needs.

[0059] In this embodiment, the inclined plate 106 is made of medium-high carbon steel, which can well solve the problem of pressing and fixing the angle of the final plate. The inlaid clamp 107 is inlaid, which can be well connected and fixed with the inclined plate 106, and can effectively press the inclined plate 106, so that the inclined plate 106 can reliably clamp the two ends of the core unit 1. Figure 3As shown, the inclined plate 106 and the embedded clamp 107 are located at the end of the core unit 1. The inclined plate 106 and the embedded clamp 107 are connected in cooperation to make the core unit 1 stable and tight. Figure 6 and Fig.12 As shown, the inclined plate 106 is a medium-high carbon steel inclined surface structure with an inlay groove, and its cross section is processed into a triangle-like shape. The inclined plate 106 has a larger inclined surface to adapt to the clamping of the end-stage piece of the side column and the stable filling of the triangular area of the core column, and its two ends are provided with inlay grooves. The inlay clamp 107 is a medium carbon steel plate structure with U-shaped notches at both ends and threaded holes. When installed, the inlay groove of the inclined plate 106 and the U-shaped notch of the inlay clamp 107 are engaged with each other in a concave-convex manner, thereby realizing the connection between the inclined plate 106 and the inlay clamp 107.

[0060] The preparation method of the core unit 1 is as follows:

[0061] Using the lamination platform and lamination positioning device in the core lamination assembly device, the lamination positioning device is first fixed on the lamination platform, so that the lamination positioning device can be used to position each level (that is, each layer) of the trapezoidal silicon steel sheet in the core unit 1, ensuring that the semicircular side column 101 and the apple-shaped iron yoke 102 are accurate and stable in size. Specifically:

[0062] Two outer clamps 104 are placed parallel to each other vertically, and two outer pull plates 105 are placed parallel to each other horizontally. The two outer clamps 104 and the two outer pull plates 105 are fastened to each other with bolts to form a rectangular frame, and an insulating structure is set on the upper surfaces of the outer clamps 104 and the outer pull plates 105.

[0063] The prepared silicon steel sheets are stacked layer by layer from the first level to the last level, and the four trapezoidal silicon steel sheets of each layer come from the corresponding layers of trapezoidal silicon steel sheets of the two apple-shaped iron yokes 102 and the two semicircular side columns 101. It should be noted that the isosceles trapezoidal silicon steel sheets 109 of the semicircular side columns 101 are stacked layer by layer on the insulating structure of the outer pull plate 105, and the isosceles trapezoidal silicon steel sheets 109 of the apple-shaped iron yoke 102 and the corner-cut trapezoidal silicon steel sheets 110 are alternately stacked layer by layer on the insulating structure of the outer clamp 104, and the four trapezoidal silicon steel sheets of each layer are all multi-step stepped bevel joints at the head and tail corners.

[0064] After the final silicon steel sheets of the two apple-shaped iron yokes 102 and the two semicircular side columns 101 are stacked, an insulating structure is set on the final silicon steel sheets of the two apple-shaped iron yokes 102 and the two semicircular side columns 101, and then the inclined pull plates 106 and the embedded clamps 107 are placed at the final positions of the apple-shaped iron yokes 102 and the semicircular side columns 101 respectively, and the inclined pull plates 106 and the embedded clamps 107 are matched and connected and fixed to form complete left and right semicircular side columns 101 and upper and lower apple-shaped iron yokes 102.

[0065] Finally, an upper yoke support plate and a pull strap 103 are arranged on the upper apple-shaped iron yoke 102 to fasten the upper apple-shaped iron yoke 102 into shape, and at the same time, the outer clamp 104 and the inlaid clamp 107 are connected to the upper apple-shaped iron yoke 102 by bundling; a lower yoke pad and a pull strap 108 are arranged on the lower apple-shaped iron yoke 102 to fasten the lower apple-shaped iron yoke 102 into shape, and at the same time, the outer clamp 104 and the inlaid clamp 107 are connected to the lower apple-shaped iron yoke 102 by bundling.

[0066] If the silicon steel sheets of the apple-shaped iron yoke 102 are perforated isosceles trapezoidal silicon steel sheets 111 and perforated de-pointed trapezoidal silicon steel sheets 112, bolts can be sequentially passed through the outer clamp 104, the positioning holes on the isosceles trapezoidal silicon steel sheets of various levels, and the inlaid clamp 107, and then connected with nuts to achieve the fixation of the outer clamp 104 and the inlaid clamp 107 to the apple-shaped iron yoke 102. At the same time, the upper yoke support plate and the drawstring 103 can still be set on the upper apple-shaped iron yoke 102, and the lower yoke pad and the drawstring 108 can still be set on the lower apple-shaped iron yoke 102, which is conducive to the fastening and forming of the apple-shaped iron yoke 102.

[0067] At this point, the preparation of one core unit 1 is completed.

[0068] As can be seen from the above, the utility model uses isosceles trapezoidal silicon steel sheets to stack step by step to form an iron core unit 1 with two side columns (i.e., semicircular side columns 101) with semicircular cross-sections and two horizontal iron yokes (i.e., apple-shaped iron yokes 102) with apple-shaped cross-sections, and an inclined pull plate 106 and an inlaid clamp 107 are arranged at the last stage of the iron core unit 1 to make the iron core unit 1 stable and tight. The entire iron core unit 1 has a stable and delicate structure, reliable and excellent performance, simple and efficient manufacturing, and can eliminate the shortcomings of the traditional planar stacked core transformer, such as unbalanced three-phase magnetic circuit, large consumables, high loss, and large size of three-dimensional wound core iron yoke, large consumables, long production cycle, and high manufacturing cost. The outer contour of the apple-shaped iron yoke 102 is round, and it has the characteristics of good electrical characteristics, high safety and reliability, compact overall structure, small size, material saving, simple processing, short production cycle, high economic benefits, low loss, high efficiency and energy saving, and low carbon footprint.

[0069] Embodiment 2

[0070] like Figure 1 As shown, this embodiment proposes a three-phase three-dimensional transformer apple yoke laminated core 100, comprising three groups of core units 1 in the first embodiment, the semicircular side columns 101 of the three groups of core units 1 are connected end to end in sequence, so that the apple-shaped iron yokes 102 at both ends of the three groups of core units 1 are all enclosed to form an equilateral triangle. Among them, an insulating partition is provided at the joint between any two adjacent semicircular side columns 101. Figure 1As shown, a connecting clamping device 2 can be provided between the outer clamps 104 of adjacent core units 1 to achieve fastening between adjacent core units 1. The clamping device 2 here can be a bolt or a screw, which penetrates the ends of the outer clamps 104 of the two core units 1 and can be fastened with a matching nut to achieve fixation. Since the cross section of the semicircular side column 101 of each group of core units 1 is semicircular, after the semicircular side columns 101 of adjacent core units 1 are butted against each other, a core column 6 with a circular cross section can be formed between the two adjacent core units 1.

[0071] Specifically, in this embodiment, an inner tightening device 5 can be provided in the inner ring of the three groups of core units 1. The inner tightening device 5 can adopt a screw structure, which is movably installed on the embedded clamp 107. By rotating and adjusting the screw, each group of core units 1 can be tightened from the inside to the outside in a balanced manner. At the same time, the core column oblique pads 4 can be provided at the three vertex positions of the equilateral triangle to further stabilize the three core units 1, so that the three-phase three-dimensional transformer apple yoke stacked core 100 can be reliably fastened as a whole.

[0072] The preparation method of the above-mentioned three-phase three-dimensional transformer apple yoke laminated core 100 is as follows:

[0073] The three groups of prepared core units 1 are precisely docked into an equilateral triangle with an angle of 60° through the flipping and moving mechanism of the core lamination assembly device, so that each two adjacent semicircular side columns 101 are docked to form a core column 6, and an insulating partition 3 is placed at the docking point. Then the outer clamps 104 of the two adjacent core units 1 are fastened and connected with the clamping device 2, and then the inner tightening device 5 is fixed on the inner clamp of the triangle (i.e., the inlaid clamp 107), and the inner tightening device 5 can tighten the iron yoke to the outside by adjusting the screw. Finally, the core column oblique pads 4 are set at the three vertex positions of the equilateral triangle to complete the preparation of the three-phase three-dimensional transformer apple yoke stacked core 100.

[0074] The above-mentioned three-phase three-dimensional transformer apple yoke stacked core 100 adopts the side columns of three groups of core units 1 to be connected to each other, so that the apple-shaped iron yokes 102 of the three groups of core units 1 are distributed in an equilateral triangle, and then the outer clamping and inner supporting structure formed by the special clamping device 2 and the inner supporting device 5 can reliably clamp the trapezoidal silicon steel sheets of each layer of the core unit 1. The main advantages of the above-mentioned three-phase three-dimensional transformer apple yoke stacked core 100 are: first, it reduces the overall height of the core and the transformer and effectively reduces the material cost; second, the iron yoke adopts an apple-shaped cross-section, the outer contour is round and smooth, the electric field strength is uniform, and partial discharge failures can be avoided; third, the clamping degree of the iron yoke is enhanced, and the overall stability and mechanical strength of the iron core are improved; fourth, the sheet types are few and simple, the manufacturing cycle is short, and the production efficiency is high; fifth, the iron yoke cross-section is optimized, which can reduce the influence of harmonic magnetic flux, reduce losses, and improve energy-saving effects, and has extremely broad application prospects.

[0075] It can be seen that the utility model creatively proposes a new apple-shaped yoke cross-section and a simple and fast three-dimensional stacked core production method, which avoids the defects of the three-dimensional wound core's yoke cross-section being the same as the core column cross-section, the D-shaped yoke cross-section and the conventional transformer core, and lays a foundation for the simple and efficient production of a new three-dimensional stacked core transformer, highlights its technical and economic performance advantages, and is more in line with the requirements of the times for social development and the realization of the production of high-efficiency transformers.

[0076] Embodiment 3

[0077] This embodiment provides a transformer, including the three-phase stereo transformer apple yoke laminated core 100 disclosed in the second embodiment.

[0078] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A core unit, characterized in that: It comprises two apple-shaped iron yokes arranged in parallel and two semicircular side columns arranged in parallel, wherein the two apple-shaped iron yokes and the two semicircular side columns are spliced to form a closed rectangular iron core unit; wherein: The semicircular side column is formed by stacking a plurality of isosceles trapezoidal silicon steel sheets layer by layer, and the cross section of the semicircular side column is semicircular; The apple-shaped iron yoke is formed by stacking a plurality of tapered trapezoidal silicon steel sheets and a plurality of isosceles trapezoidal silicon steel sheets alternately and layer by layer, and the cross section of the apple-shaped iron yoke is apple-shaped; the tapered trapezoidal silicon steel sheet is a structure in which a bottom corner is cut off from the isosceles trapezoidal silicon steel sheet; The joints between the semicircular side columns and the apple-shaped iron yoke form multi-step stepped bevel joints.

2. The core unit according to claim 1, characterized in that: The widths of the first and last trapezoidal silicon steel sheets in the apple-shaped iron yoke are respectively greater than the widths of the first and last trapezoidal silicon steel sheets in the semicircular side columns.

3. The core unit according to claim 1, characterized in that: The maximum width of the trapezoidal silicon steel sheets in the apple-shaped iron yoke is smaller than the maximum width of the trapezoidal silicon steel sheets in the semicircular side columns.

4. The core unit according to claim 1, characterized in that: The cross-sectional area of the apple-shaped iron yoke is 1.1 to 1.16 times the cross-sectional area of the semicircular side column.

5. The core unit according to any one of claims 1 to 4, characterized in that: The outer side surfaces of the first-stage silicon steel sheets and the last-stage silicon steel sheets of the semicircular side column are respectively provided with an outer pull plate and an inclined pull plate, and an insulating structure is provided between the outer pull plate and the adjacent silicon steel sheet, and between the inclined pull plate and the adjacent silicon steel sheet; the outer side surfaces of the first-stage silicon steel sheets and the last-stage silicon steel sheets of the apple-shaped iron yoke are respectively provided with an outer clamp and an inlaid clamp, and an insulating structure is provided between the outer clamp and the adjacent silicon steel sheet, and between the inlaid clamp and the adjacent silicon steel sheet; The outer clamp and the inlaid clamp are both connected to the apple-shaped iron yoke; Both ends of any one of the outer pull plates are fixedly connected to the two outer clamps of the two apple-shaped iron yokes respectively; The two ends of any one of the inclined pull plates are respectively connected to the two inlaid clamps of the two apple-shaped iron yokes.

6. The core unit according to claim 5, characterized in that: Positioning holes are provided on the isosceles trapezoidal silicon steel sheets at any level of the apple-shaped iron yoke. Bolts are sequentially passed through the outer clamp, the positioning holes on the isosceles trapezoidal silicon steel sheets at each level and the inlaid clamp, and then connected to the fastening structure to achieve the connection between the outer clamp, the inlaid clamp and the apple-shaped iron yoke.

7. The core unit according to claim 5, characterized in that: The two apple-shaped iron yokes are arranged in parallel up and down; an upper yoke support plate and a pull strap are provided on the upper apple-shaped iron yoke to realize the connection between the outer clamp and the inlaid clamp and the upper apple-shaped iron yoke, and to fasten the upper apple-shaped iron yoke into shape; a lower yoke pad and a pull strap are provided on the lower apple-shaped iron yoke to realize the connection between the outer clamp and the inlaid clamp and the lower apple-shaped iron yoke, and to fasten the lower apple-shaped iron yoke into shape.

8. A three-phase transformer apple yoke laminated core, characterized in that: It comprises three groups of core units as described in any one of claims 5 to 7, the semicircular side columns of the three groups of core units are butted end to end in sequence, the apple-shaped iron yokes at both ends of the three groups of core units are enclosed to form an equilateral triangle, the semicircular side columns of any two adjacent core units are butted together to form a core column with a circular cross-section; the outer clamps of any two adjacent core units are connected and fixed by a clamping device.

9. The three-phase transformer apple yoke laminated core according to claim 8, characterized in that: The inner rings of the three groups of core units are also provided with inner tightening devices, and the inner tightening devices can tighten the core units from the inside to the outside.

10. A transformer, characterized in that: It includes the three-phase stereo transformer apple yoke laminated core as described in claim 8 or 9.