Power transformer iron core

Abstract

The invention provides a power transformer iron core which comprises an upper iron yoke, a lower iron yoke, central columns, left core columns and right core columns, and each central column lamination group, each left core column lamination group and each right core column lamination group are provided with flush upper butt joint parts and lower butt joint parts staggered in a stepping mode respectively; the upper iron yoke laminations have the same size and are stacked into a group in a flush manner, so that the flush butt joint parts are in butt joint with the flush upper butt joint parts of the central column, the left core column and the right core column; and the lower iron yoke laminations are stacked into groups step by step, so that the step-staggered butt joint parts are in butt joint with the step-staggered lower butt joint parts of the central column, the left core column and the right core column. Therefore, the upper iron yoke can be independently stacked and formed, and can be easily jointed with or separated from the central column, the left core column and the right core column, so that the upper iron yoke can be quickly mounted and dismounted, and the laminated sheets cannot be damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer manufacturing, and in particular relates to a power transformer core with a laminated structure. Background Art

[0002] The traditional transformer core structure adopts a multi-level stepped stacking structure, in which the joints between the upper and lower iron yokes and each core column adopt stepped staggered butt-jointed inclined joints. When stacking, the silicon steel sheet laminates are grouped according to a certain number of steps, and each group of silicon steel sheets is stacked in a horizontal or vertical step manner with a fixed distance offset, thereby forming a stepped joint structure, which is then plugged into the stepped joint structure of the corresponding shape of the adjacent silicon steel sheet group. When stacking, workers are required to stack and assemble the silicon steel sheets of the upper and lower iron yokes and each core column in sequence according to the set number of steps and sequence, and at the joint position, the alignment and flatness of the joint must be strictly ensured. In this field, "step stacking" is another term for "step-lap", which means that when the laminates are stacked, the edges are staggered at a fixed displacement, and each stacking forms a step at the stacked edges of adjacent laminates, which can be called a "step stacking" between the laminates. Similarly, when the edges are staggered multiple times with a fixed displacement to form multiple steps, it can be said that multiple "step stacking" has occurred.

[0003] This step-by-step stacking structure ensures a certain degree of joint firmness at the joints of the core structure, but this increases the difficulty of use in application scenarios with special needs for coil replacement. These application scenarios include: when used in scientific research transformers, such as in short-circuit characteristic research prototypes, the coils need to be disassembled and replaced multiple times for repeated testing and research; or in performance testing of the coils, the coils need to be tested in the core state before shipment as components, and then removed from the core for separate transportation. In these application scenarios, since the coils need to be replaced, the iron yoke must be repeatedly removed and inserted, which means that workers need to manually disassemble and install the silicon steel sheets piece by piece. This not only consumes a lot of manpower and time, but the repeated disassembly and installation of each piece can also cause accidental damage to the silicon steel sheets, ultimately affecting product performance and test results.

[0004] Therefore, the applicant realizes that it is necessary to provide a transformer core that is more convenient for disassembling and assembling the coil, so as to solve the above-mentioned problems in the prior art. Summary of the Invention

[0005] The purpose of the present disclosure is to provide a transformer core that can realize the rapid installation and removal of the upper iron yoke. Further, it is hoped to provide a transformer core that can avoid damage to the laminations caused by the removal and installation of the upper iron yoke.

[0006] According to one aspect of the present disclosure, there is provided a transformer core, comprising:

[0007] an upper iron yoke arranged along a first direction and formed by stacking a plurality of upper iron yoke lamination groups, each upper iron yoke lamination group including N stacked upper iron yoke laminations of the same shape, wherein N ≥ 2; a lower iron yoke arranged parallel to the upper iron yoke and formed by stacking a plurality of lower iron yoke lamination groups, each lower iron yoke lamination group including N stacked lower iron yoke laminations; a center column arranged along a second direction perpendicular to the first direction and formed by stacking a plurality of center column lamination groups, each center column lamination group including N stacked center column laminations; a left core column arranged parallel to the center column on the left side of the center column and formed by stacking a plurality of left core column lamination groups, each left core column lamination group including N stacked left core column laminations; and a right core column arranged parallel to the center column on the right side of the center column and formed by stacking a plurality of right core column lamination groups, each right core column lamination group including N stacked right core column laminations,

[0008] The upper edges of the N center column laminations are butted against the center grooves of the N upper iron yoke laminations, and the lower edges of the N center column laminations are butted against the center grooves of the N lower iron yoke laminations; the upper edges of the N left core column laminations are butted against the left edges of the N upper iron yoke laminations, and the lower edges of the N left core column laminations are butted against the left edges of the N lower iron yoke laminations; and the upper edges of the N right core column laminations are butted against the right edges of the N upper iron yoke laminations, and the lower edges of the N right core column laminations are butted against the right edges of the N lower iron yoke laminations.

[0009] In particular, the N center column laminations are stacked step by step so that the center column lamination group has a flush upper butt joint and a step-by-step staggered lower butt joint; the N left core column laminations are stacked step by step so that the left core column lamination group has a flush upper butt joint and a step-by-step staggered lower butt joint; the N right core column laminations are stacked step by step so that the right core column lamination group has a flush upper butt joint and a step-by-step staggered lower butt joint; the N upper iron yoke laminations have the same size and are stacked flush so that the upper iron yoke lamination group has a flush upper butt joint and a step-by-step staggered lower butt joint. The lamination group has a flush center docking portion, a left docking portion, and a right docking portion, so as to be flush docked with the upper docking portion of the center column lamination group, the upper docking portion of the left core column lamination group, and the upper docking portion of the right core column lamination group; and the N lower iron yoke laminations are stacked step by step so that the lower iron yoke lamination group has a step-by-step staggered center docking portion, a left docking portion, and a right docking portion, so as to be step-by-step docked with the lower docking portion of the center column lamination group, the lower docking portion of the left core column lamination group, and the lower docking portion of the right core column lamination group.

[0010] In the transformer core according to the embodiments of the present disclosure, the lower iron yoke is assembled with the center, left, and right cores using the traditional step-by-step stacking and splicing method. However, the upper iron yoke is aligned flush with the center, left, and right cores, rather than interlaced butt joints. This allows for quick installation and removal of the upper iron yoke without damaging the laminations due to frequent installation and removal.

[0011] Specifically, the butt joint edges between two adjacent laminates are inclined at an angle of 45° relative to the first direction.

[0012] Specifically, the lower edge of each center column lamination is in a right-angled shape and has a lower vertex, and the central groove of each lower iron yoke lamination is a right-angled V-shaped groove.

[0013] Optionally, the shapes of the lower edges of the N center leg laminations are stepwise varied, such that the lower vertices of the lower edges of the N center leg laminations are stepwise offset by a first distance in a first direction; the lengths of the N left core leg laminations are stepwise varied, such that the lower edges of the N left core leg laminations are stepwise offset by a first distance in a second direction; the lengths of the N right core leg laminations are stepwise varied, such that the lower edges of the N right core leg laminations are stepwise offset by a first distance in the second direction; and the N lower yoke laminations have the same shape and are stepwise arranged in the first direction such that the center slots, left edges, and right edges of the N lower yoke laminations are stepwise offset by the first distance. A horizontally stepwise stacked transformer core is thereby obtained.

[0014] Alternatively, the lengths of the N center leg laminations are stepwise varied, such that the lower edges of the N center leg laminations are stepwise offset by a second distance in the second direction; the lengths of the N left core leg laminations are stepwise varied, such that the lower edges of the N left core leg laminations are stepwise offset by a second distance in the second direction; the lengths of the N right core leg laminations are stepwise varied, such that the lower edges of the N right core leg laminations are stepwise offset by a second distance in the second direction; and the N lower yoke laminations have stepwise varied lengths and stepwise varied center slot depths, such that the left and right edges of the N lower yoke laminations are stepwise offset by a second distance in the first direction, respectively, and the center slots of the N lower yoke laminations are stepwise offset by a second distance in the second direction. Thus, a vertically stepwise stacked transformer core is obtained.

[0015] Optionally, the transformer core is used for a three-phase transformer, wherein the center leg, the left leg and the right leg are all used to support coils, and each upper yoke lamination and each lower yoke lamination are wide complete laminations.

[0016] Optionally, the transformer core is for a single-phase transformer, wherein only the center column is used to support the coil, and wherein: each upper yoke lamination is composed of two upper yoke half laminations of equal size, and the center slot of the upper yoke lamination is defined by the adjacent edges of the two upper yoke half laminations; and each lower yoke lamination is composed of two lower yoke half laminations of equal size, and the center slot of the lower yoke lamination is defined by the adjacent edges of the two lower yoke half laminations.

[0017] Preferably, N=6, and wherein: the upper iron yoke lamination group, the lower iron yoke lamination group, the center column lamination group, the left core column lamination group and the right core column lamination group each include 6 sheet types; or the upper iron yoke lamination group, the lower iron yoke lamination group, the center column lamination group, the left core column lamination group and the right core column lamination group each include 3 sheet types, and every two laminations have the same sheet type.

[0018] Furthermore, the upper yokes are independently stacked and fixed together via a fastening device. The fastening device includes multiple yoke threading screws, and each upper yoke lamination has multiple through-holes for the threading screws to pass through. This not only facilitates the alignment of the upper yoke laminations, but also ensures the structural strength of the upper yoke, thereby facilitating assembly and disassembly of the upper yoke.

[0019] Furthermore, the device includes a fastening fixture for clamping the upper iron yoke to the center column, left core column, right core column, and lower iron yoke. The fastening fixture includes an upper clamping plate disposed on the top of the upper iron yoke; a lower clamping plate disposed on the bottom of the lower iron yoke; and a plurality of tie rods connected between the upper and lower clamping plates to provide a clamping force. The upper clamping plate and the plurality of tie rods are detachably connected. This facilitates the assembly and disassembly of the upper iron yoke while ensuring its secure installation.

[0020] In the transformer core according to the embodiment of the present invention, the lower iron yoke is still assembled with the center column, left core column and right core column in the original step-by-step stacking and splicing form, while the upper iron yoke does not have a step-by-step docking of the laminations with the center column, left core column and right core column, but is docked flush with a flat docking surface. Therefore, the upper iron yoke can be stacked independently into one body and can be easily engaged or separated with the center column, left core column and right core column without the need for workers to manually insert or remove the laminations, thereby realizing the rapid installation and removal of the upper iron yoke, and preventing the laminations from being damaged due to frequent installation and removal, which saves labor and time costs and ensures the stable performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features and advantages of one or more embodiments of the present invention will become more readily understood through the following description with reference to the accompanying drawings. The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. The drawings are not drawn to scale and may exaggerate or reduce some features to show details of particular components. In the drawings:

[0022] Figure 1 A simplified schematic diagram of a core lamination unit of a three-phase transformer core according to the first embodiment of the present disclosure is shown;

[0023] Figure 2 A schematic diagram showing components of a core lamination unit of a three-phase transformer core according to the first embodiment of the present disclosure;

[0024] Figure 3 A schematic diagram showing a horizontal step-by-step stacking scheme of a core lamination unit of a three-phase transformer core according to the first embodiment of the present disclosure is shown;

[0025] Figure 4 A schematic diagram showing a vertical step-by-step stacking scheme of a core lamination unit of a three-phase transformer core according to a second embodiment of the present disclosure is shown;

[0026] Figure 5 A simplified schematic diagram of a core lamination unit of a single-phase transformer core according to a third embodiment of the present disclosure is shown;

[0027] Figure 6 A schematic diagram showing components of one core lamination unit of a single-phase transformer core according to a third embodiment of the present disclosure; and

[0028] Figure 7 A schematic diagram showing a horizontal step-by-step stacking scheme of a core lamination unit of a single-phase transformer core according to a third embodiment of the present disclosure is shown.

[0029] Description of Figure Numbers:

[0030] 10. Upper iron yoke lamination group 12. Lower edge of upper iron yoke lamination

[0031] 13. Center slot H, through hole

[0032] 14. Left edge of the upper iron yoke lamination 15. Right edge of the upper iron yoke lamination

[0033] 20. Lower iron yoke lamination group 20-1. First lower iron yoke lamination

[0034] 20-2, second lower yoke lamination 20-3, third lower yoke lamination

[0035] 22. Upper edge of lower iron yoke lamination 23. Center groove

[0036] 24. Left edge of the lower yoke lamination 25. Right edge of the lower yoke lamination

[0037] 30. Center column lamination set 30-1. First center column lamination

[0038] 30-2, second center column lamination 30-3, third center column lamination

[0039] 31. Upper edge of the center column lamination 32. Lower edge of the center column lamination

[0040] 40. Left heart column lamination group 40-1. First left heart column lamination

[0041] 40-2, second left heart column lamination 40-3, third left heart column lamination

[0042] 41. Upper edge of the left core lamination 42. Lower edge of the left core lamination

[0043] 50. Right heart column lamination group 50-1. First right heart column lamination

[0044] 50-2, second right heart column lamination 50-3, third right heart column lamination

[0045] 51. Upper edge of the right core lamination 52. Lower edge of the right core lamination

[0046] S1, first distance S2, second distance

[0047] 110, upper iron yoke half laminate 120, lower iron yoke half laminate

[0048] 120-1, first lower iron yoke half laminate 120-2, second lower iron yoke half laminate

[0049] 120-3, the third lower iron yoke half laminate DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form.

[0052] Figure 1A simplified schematic diagram of a core lamination unit of a three-phase transformer core of the first embodiment is schematically shown. The core lamination unit includes an upper yoke lamination, a lower yoke lamination, a center column lamination, a left core column lamination, and a right core column lamination that are butt-jointed. In this article, "butt-jointing" refers to the fact that the edges of two laminations or two components that are joined are parallel and fit together in an almost seamless state. Here, the meaning of "stepping" is equivalent to the exclusive meaning in this field, and "step stacking / stacking" means that when the laminations are stacked, the edges are staggered with a fixed displacement, and each stacking of the stacked edges of adjacent laminations forms a step, which can be called a "step stacking" between the laminations. Similarly, when the edges are staggered multiple times with a fixed displacement to form multiple steps, it can be called multiple "step stacking" occurs.

[0053] In the transformer core, the upper iron yoke is arranged in a horizontal direction (first direction) and is formed by stacking a plurality of upper iron yoke lamination groups 10 , each upper iron yoke lamination group 10 including N stacked upper iron yoke laminations of the same shape. N is an integer greater than or equal to 2. The lower iron yoke is arranged horizontally parallel to the upper iron yoke and is composed of a plurality of stacked lower iron yoke lamination groups 20, each of which includes N stacked lower iron yoke laminations. The center leg is arranged along the vertical centerline of the transformer core (i.e., along a second direction perpendicular to the first direction) and is composed of a plurality of stacked center leg lamination groups 30, each of which includes N stacked center leg laminations. The left core leg is arranged vertically parallel to the center leg and is composed of a plurality of stacked left core leg lamination groups 40, each of which includes N stacked left core leg laminations. The right core leg is arranged vertically parallel to the center leg and is composed of a plurality of stacked right core leg lamination groups 50, each of which includes N stacked right core leg laminations. Typically, the plurality of lamination groups can have different widths, so that the ultimately stacked upper iron yoke, lower iron yoke, left core leg, center leg, and right core leg all have approximately cylindrical cross-sections.

[0054] During assembly, the upper edge 31 of the center column lamination is docked with the center groove 13 of the upper iron yoke lamination, and the lower edge 32 of the center column lamination is docked with the center groove 23 of the lower iron yoke lamination, so that the center column is centrally arranged between the upper iron yoke and the lower iron yoke; the upper edge 41 of the left core column lamination is docked with the left edge 14 of the upper iron yoke lamination, and the lower edge 42 of the left core column lamination is docked with the left edge 24 of the lower iron yoke lamination; and wherein, the upper edge 51 of the right core column lamination is docked with the right edge 15 of the upper iron yoke lamination, and the lower edge 52 of the right core column lamination is docked with the right edge 25 of the lower iron yoke lamination respectively.

[0055] In particular, the center column laminations, left core column laminations and right core column laminations are stacked into groups in a step-by-step manner, so that the center column lamination group 30, the left core column lamination group 40 and the right core column lamination group 50 respectively have a flush upper docking part and a step-by-step staggered lower docking part, the flush upper docking part includes a flat upper docking surface for docking with the flat docking surface of the upper iron yoke, and the step-by-step staggered lower docking part includes a staggered lower docking surface for docking with the staggered docking surface of the lower iron yoke.

[0056] Further, the laminations in the upper iron yoke lamination stack 10 have the same size and are stacked flush in groups, thereby forming flush docking portions to dock with the flush upper docking portions of the center column lamination stack 30 , the left core column lamination stack 40 and the right core column lamination stack 50 .

[0057] At the same time, the laminations in the lower iron yoke lamination group 20 are stacked into groups step by step to form a step-by-step staggered docking portion to dock with the step-by-step staggered lower docking portions of the center column lamination group 30, the left core column lamination group 40 and the right core column lamination group 50.

[0058] In the transformer core formed in this manner, the lower yoke is assembled with the center, left, and right cores using the original step-by-step stacking and splicing method. However, the upper yoke is aligned flush with the center, left, and right cores, rather than interlaced, butt-jointed laminations. Therefore, the upper yoke can be independently stacked and easily joined or separated from the center, left, and right cores using a lifting mechanism. This eliminates the need for manual insertion or removal of laminations, enabling quick and easy installation and removal of the upper yoke. Frequent installation and removal prevents damage to the laminations, saving both labor and time while ensuring stable product performance.

[0059] In the present disclosure, the butt edges between two adjacent laminations are both beveled edges inclined at an angle of 45° relative to the horizontal direction. In particular, the center groove 13 of the upper iron yoke lamination and the center groove 23 of the lower iron yoke lamination are both right-angled V-shaped grooves, and the upper edge 31 and the lower edge 32 of the center column lamination are both right-angled to match the shape of the right-angled V-shaped groove.

[0060] Next, we will combine Figure 2 and Figure 3 The design and combination of the various parts of the transformer core according to the first embodiment of the present disclosure will be described in more detail. For the sake of clarity, the present disclosure will be described using the case where N=3 as an example.

[0061] like Figure 2 and Figure 3As shown, the three center column laminations 30-1, 30-2, and 30-3 have lower edges 32 with step-changing shapes. Specifically, the lower vertices of the lower edges 32 of the first center column lamination 30-1, the second center column lamination 30-2, and the third center column lamination 30-3 are step-shifted from left to right in the horizontal direction by a first distance S1.

[0062] See also Figure 3 Corresponding to the stepwise changes in the three center column laminations 30-1, 30-2, and 30-3, the three lower yoke laminations 20-1, 20-2, and 20-3, each having the same shape, are arranged in a stepwise manner in the horizontal direction so that their center grooves 23 precisely mate with the stepwise staggered lower edges 32 of the three center column laminations 30-1, 30-2, and 30-3. Specifically, the center grooves 23 of the first, second, and third lower yoke laminations 20-1, 20-2, and 20-3 are stepwise offset from left to right by a first distance S1. Correspondingly, the left and right edges 24 and 25 of the first, second, and third lower yoke laminations 20-1, 20-2, and 20-3 are also stepwise offset from left to right by the first distance S1.

[0063] Corresponding to the stepwise length changes of the three center column laminations 30-1, 30-2, and 30-3, the three left column laminations 40-1, 40-2, and 40-3 have stepwise length changes to accurately mate with the stepwise staggered left edges 24 of the three lower iron yoke laminations 20-1, 20-2, and 20-3. Specifically, the first left column lamination 40-1, the second left column lamination 40-2, and the third left column lamination 40-3 are progressively lengthened, such that the lower edges 42 of the laminations are progressively offset downwardly by a first distance S1 in the vertical direction.

[0064] Similarly, corresponding to the stepwise changes in the length of the three center column laminations 30-1, 30-2, and 30-3, the three right core column laminations 50-1, 50-2, and 50-3 also have stepwise changes in length to accurately mate with the stepwise staggered right edges 25 of the three lower iron yoke laminations 20-1, 20-2, and 20-3. Specifically, in the opposite direction of the stepwise changes in the length of the three lower iron yoke laminations 20-1, 20-2, and 20-3, the first right core column lamination 50-1, the second right core column lamination 50-2, and the third right core column lamination 50-3 are stepwise shortened, causing the lower edge 52 to be stepwise offset upward in the vertical direction by a first distance S1.

[0065] Of course, the above stepping direction or sequence is not unique and can be reversed.

[0066] This first embodiment provides an optional horizontal stepping solution, which can be easily realized by only regularly changing the shapes or sizes of the three stems.

[0067] As an alternative, Figure 4 A schematic diagram of a vertical step-by-step stacking scheme of a three-phase transformer core according to a second embodiment of the present disclosure is shown. In this scheme, the three center leg laminations, the three left leg laminations, and the three right leg laminations all have step-by-step lengths.

[0068] like Figure 4 As shown, the first center column lamination 30-1, the second center column lamination 30-2 and the second center column lamination 30-3 are extended step by step so that the lower edge 32 is offset step by step downward in the vertical direction by a second distance S2; similarly, the lower edge 42 of the first left core column lamination 40-1, the second left core column lamination 40-2 and the third left core column lamination 40-3 is offset step by step downward in the vertical direction by a second distance S2; and the lower edge 52 of the first right core column lamination 50-1, the second right core column lamination 50-2 and the third right core column lamination 50-3 is offset step by step downward in the vertical direction by a second distance S2.

[0069] To achieve accurate docking, the three lower yoke laminations 20-1, 20-2, and 20-3 have progressively shorter lengths and progressively deeper center groove depths, corresponding to the progressive changes in the three center column laminations 30-1, 30-2, and 30-3, the three left core column laminations 40-1, 40-2, and 40-3, and the three right core column laminations 50-1, 50-2, and 50-3. Specifically, the left edge 24 and right edge 25 of the first lower yoke lamination 20-1, the second lower yoke lamination 20-2, and the third lower yoke lamination 20-3 are progressively offset toward the center in the horizontal direction by a second distance S2, and the depth of the center groove 23 is progressively deepened in the vertical direction by the second distance S2.

[0070] Of course, the above stepping direction or sequence is not unique and can be reversed.

[0071] exist Figures 1 to 4 The transformer core shown in FIG is suitable for a three-phase transformer, wherein the center leg, the left core leg and the right core leg are all used to support the coil, so each upper iron yoke lamination and each lower iron yoke lamination are wide complete laminations.

[0072] However, the transformer core according to the present disclosure can also be used in a single-phase transformer, i.e. only the central leg is used to support the coils. Figures 5 to 7 , which shows a stacking scheme for a single-phase transformer, in which case the left core lamination has a width equivalent to half of the left core lamination in a three-phase transformer, the right core lamination has a width equivalent to half of the right core lamination in a three-phase transformer, and the left core and right core finally stacked have a roughly semicircular cross-section.

[0073] Corresponding to the above changes in the left and right core legs, in this single-phase transformer, the laminations of the upper and lower iron yokes also have half the width. In this way, the depth of the central V-shaped groove of the upper iron yoke and the central V-shaped groove of the lower iron yoke will be exactly equal to the width of the upper and lower iron yokes. In this case, if Figure 6 As shown, each upper yoke lamination can be composed of two upper yoke half laminations 110 of equal size, and the center groove of the upper yoke lamination is defined by the adjacent edges of the two upper yoke half laminations 110; similarly, each lower yoke lamination can be composed of two lower yoke half laminations 120 of equal size, and the center groove of the lower yoke lamination is defined by the adjacent edges of the two lower yoke half laminations 120.

[0074] Further, see Figure 6 and Figure 7 The single-phase transformer core can be stacked using the horizontal stepping scheme described in the first embodiment, wherein the two sets of lower yoke half laminations 120-1, 120-2, and 120-3 are stacked in a stepping manner in the horizontal direction. Although not shown, the single-phase transformer core can also be stacked using the vertical stepping scheme described in the second embodiment. The specific details will not be elaborated here.

[0075] Although the first to third embodiments are described above using the solution of N=3 as an example. However, in actual applications, in a lamination group, the number N of laminations can be equal to 6, 7 or 8, etc., and each lamination group can have either N lamination types or N / 2 lamination types. Taking N=6 as an example, as an embodiment, the upper iron yoke lamination group 10, the lower iron yoke lamination group 20, the center column lamination group 30, the left core column lamination group 40 and the right core column lamination group 50 can each include 6 lamination types, that is, each lamination has one lamination type, step by step; alternatively, the upper iron yoke lamination group 10, the lower iron yoke lamination group 20, the center column lamination group 30, the left core column lamination group 40 and the right core column lamination group 50 can each include 3 lamination types. In this case, every two laminations have the same lamination type, and every two laminations step by step.

[0076] In the transformer cores stacked according to the above-described embodiments of the present disclosure, the upper yokes can be independently stacked and fixed together via a fastening device. The fastening device can include multiple yoke threading screws, and each upper yoke lamination has multiple through-holes H for the multiple yoke threading screws to pass through. This arrangement facilitates the alignment of the upper yoke laminations and ensures the structural strength of the upper yokes, thereby facilitating assembly and disassembly of the upper yokes.

[0077] Furthermore, a fastening fixture is included for clamping and securing the independently formed upper iron yoke to the center column, left core column, right core column, and lower iron yoke that are step-by-step joined. The fastening fixture includes at least: an upper clamping plate disposed on the top of the upper iron yoke; a lower clamping plate disposed on the bottom of the lower iron yoke; and a plurality of tie rods connected between the upper and lower clamping plates to provide a clamping force between the upper and lower clamping plates. The upper clamping plate and the plurality of tie rods are detachably connected, thereby facilitating the assembly and disassembly of the upper iron yoke while ensuring a secure installation of the upper iron yoke.

[0078] Based on the above description of the specific embodiment of the transformer core according to the present disclosure, it can be seen that the transformer core of the present disclosure mainly includes: an upper iron yoke, a lower iron yoke, a center post, a left core post, and a right core post. The upper iron yoke is aligned with the center post, the left core post, and the right core post, without any overlap. Therefore, the step-by-step method enables rapid installation and removal of the upper iron yoke, and avoids damage to the laminations during installation and removal of the upper iron yoke.

[0079] The main improvements and effects are:

[0080] ① In the transformer core according to the embodiments of the present disclosure, the lower yoke is assembled with the center, left, and right cores using the traditional step-by-step stacking and splicing method. However, the upper yoke is aligned flush with the center, left, and right cores, rather than interlaced butt joints. This allows for quick installation and removal of the upper yoke without damaging the laminations due to frequent installation and removal.

[0081] ② The upper iron yoke can be independently stacked and fixed by a fastening device, which not only facilitates the alignment of the upper iron yoke laminations, but also ensures the structural firmness of the upper iron yoke, thereby facilitating the disassembly and assembly of the upper iron yoke.

[0082] While various embodiments and variations of the present invention have been described above, those skilled in the art will appreciate that the present invention is not limited to the specific embodiments and variations described above but rather encompasses various other possible combinations and combinations. Other variations and modifications may be implemented by those skilled in the art without departing from the spirit and scope of the present invention. All such variations and modifications fall within the scope of the present invention. Furthermore, all components described herein may be replaced by other technically equivalent components.

Claims

1. A power transformer core, comprising: An upper iron yoke, the upper iron yoke being arranged along a first direction and being formed by stacking a plurality of upper iron yoke lamination groups (10), each upper iron yoke lamination group (10) comprising N stacked upper iron yoke laminations of the same shape, wherein N is greater than or equal to 2; A lower iron yoke, the lower iron yoke being arranged in parallel with the upper iron yoke and being formed by stacking a plurality of lower iron yoke lamination groups (20), each lower iron yoke lamination group (20) comprising N stacked lower iron yoke laminations; A central column, the central column being arranged along a second direction perpendicular to the first direction and being formed by stacking a plurality of central column lamination groups (30), each central column lamination group (30) comprising N stacked central column laminations; A left core column, the left core column is arranged parallel to the center column and on the left side of the center column, and is formed by stacking a plurality of left core column lamination groups (40), each left core column lamination group (40) including N stacked left core column laminations; and A right core column, the right core column is arranged parallel to the center column and on the right side of the center column, and is formed by stacking a plurality of right core column lamination groups (50), each right core column lamination group (50) including N stacked right core column laminations, The upper edges (31) of the N center column laminations are butted against the center grooves (13) of the N upper iron yoke laminations, and the lower edges (32) of the N center column laminations are butted against the center grooves (23) of the N lower iron yoke laminations; The upper edges (41) of the N left core laminations are butted against the left edges (14) of the N upper iron yoke laminations, and the lower edges (42) of the N left core laminations are butted against the left edges (24) of the N lower iron yoke laminations; and The upper edges (51) of the N right core laminations are butted against the right edges (15) of the N upper iron yoke laminations, and the lower edges (52) of the N right core laminations are butted against the right edges (25) of the N lower iron yoke laminations. It is characterized in that The N center column laminations are stacked step by step so that the center column lamination group (30) has a flush upper butt joint and a step-by-step staggered lower butt joint; The N left core laminations are stacked step by step so that the left core lamination group (40) has a flush upper butt joint and a step-by-step staggered lower butt joint; The N right core laminations are stacked step by step so that the right core lamination set (50) has a flush upper butt joint and a step-by-step staggered lower butt joint; The N upper iron yoke laminations have the same size and are stacked flush so that the upper iron yoke lamination group (10) has a flush center docking portion, a left docking portion, and a right docking portion to be flush docked with the upper docking portion of the center column lamination group (30), the upper docking portion of the left core column lamination group (40), and the upper docking portion of the right core column lamination group (50); and The N lower iron yoke laminations are stacked step by step so that the lower iron yoke lamination group (20) has a center docking portion, a left docking portion and a right docking portion that are staggered in a step-by-step manner, so as to be step-docked with the lower docking portion of the center column lamination group (30), the lower docking portion of the left core column lamination group (40) and the lower docking portion of the right core column lamination group (50).

2. The power transformer core according to claim 1, characterized in that The butt joint edges between two adjacent laminates are inclined at an angle of 45° relative to the first direction.

3. The power transformer core according to claim 2, characterized in that: The lower edge (32) of each central column lamination is in a right-angled shape and has a lower vertex, and the central groove (23) of each lower iron yoke lamination is a right-angled V-shaped groove.

4. The power transformer core according to claim 3, characterized in that: The N center column laminations have lower edges (32) with step-wise changes in shape, so that lower vertices of the lower edges (32) of the N center column laminations are step-wise offset by a first distance (S1) in the first direction; The N left core laminations have lengths that vary in steps, so that lower edges (42) of the N left core laminations are offset in steps by the first distance (S1) in the second direction; The N right core laminations have lengths that vary in steps, so that lower edges (52) of the N right core laminations are offset in steps by the first distance (S1) in the second direction; and The N lower iron yoke laminations have the same shape and are arranged stepwise in the first direction, so that the center groove (23), left edge (24) and right edge (25) of the N lower iron yoke laminations are stepwise offset by the first distance (S1).

5. The power transformer core according to claim 3, characterized in that: The N center column laminations have lengths that vary in steps, so that lower edges (32) of the N center column laminations are offset in steps in the second direction by a second distance (S2); The N left core laminations have step-wise varying lengths, so that lower edges (42) of the N left core laminations are step-wise offset by the second distance (S2) in the second direction; The N right core laminations have step-wise varying lengths, so that lower edges (52) of the N right core laminations are step-wise offset by the second distance (S2) in the second direction; and The N lower yoke laminations have a step-by-step length and a step-by-step center groove depth, so that the left edge (24) and the right edge (25) of the N lower yoke laminations are respectively step-by-step offset by the second distance (S2) in the first direction, and the center groove of the N lower yoke laminations is step-by-step offset by the second distance (S2) in the second direction.

6. The power transformer core according to any one of claims 1 to 5, characterized in that: The transformer core is used for a three-phase transformer, wherein the center column, the left core column and the right core column are all used to support coils, and each upper iron yoke lamination and each lower iron yoke lamination are wide and complete laminations.

7. The power transformer core according to any one of claims 1 to 5, characterized in that: The transformer core is for a single-phase transformer, wherein only the central leg is used to support the coils, and wherein: Each upper yoke lamination is composed of two upper yoke half laminations (110) of equal size, and the central groove (13) of the upper yoke lamination is defined by the adjacent edges of the two upper yoke half laminations (110); and Each lower iron yoke lamination is composed of two lower iron yoke half laminations (120) of equal size, and the central groove (23) of the lower iron yoke lamination is defined by the adjacent edges of the two lower iron yoke half laminations (120).

8. The power transformer core according to any one of claims 1 to 5, characterized in that: N=6, and where: The upper iron yoke lamination group (10), the lower iron yoke lamination group (20), the center column lamination group (30), the left core column lamination group (40), and the right core column lamination group (50) each include six types of laminations; or The upper iron yoke lamination group (10), the lower iron yoke lamination group (20), the center column lamination group (30), the left core column lamination group (40) and the right core column lamination group (50) each include three types of laminations, and every two laminations have the same lamination type.

9. The power transformer core according to any one of claims 1 to 5, characterized in that: The upper iron yokes are stacked and fixed via a fastening device, wherein the fastening device includes a plurality of yoke-penetrating screws, and each upper iron yoke lamination has a plurality of through holes (H) for the plurality of yoke-penetrating screws to pass through.

10. The power transformer core according to claim 9, characterized in that: The power transformer core further includes a fastening fixture for clamping the upper iron yoke with the center column, the left core column, the right core column and the lower iron yoke, the fastening fixture including: an upper splint, arranged on top of the upper iron yoke; a lower clamping plate, arranged at the bottom of the lower iron yoke; and A plurality of pull rods are connected between the upper clamping plate and the lower clamping plate to provide a clamping force, wherein the upper clamping plate and the plurality of pull rods are connected in a detachable manner.

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