Power transformer core

Abstract

The application provides a power transformer core, comprising an upper yoke, a lower yoke, a center column, a left core column and a right core column, wherein each center column lamination group, each left core column lamination group and each right core column lamination group respectively have flush upper butt joints and stepped staggered lower butt joints; each upper yoke lamination has the same size and is stacked in groups flushly, thereby butt joining with the flush upper butt joints of the center column, the left core column and the right core column; and each lower yoke lamination is stacked in groups step by step, thereby butt joining with the stepped staggered lower butt joints of the center column, the left core column and the right core column. Therefore, the upper yoke can be independently stacked and formed, and can be easily connected or separated with the center column, the left core column and the right core column, realizing quick installation and removal of the upper yoke without damaging the laminations.

Description

Technical Field

[0001] This invention belongs to the field of transformer manufacturing technology, and specifically relates to a power transformer core with a laminated structure. Background Technology

[0002] Traditional transformer core structures employ a multi-level stepped stacking structure. The joints between the upper and lower yokes and each core column utilize stepped, staggered, inclined joints. During stacking, silicon steel sheets are grouped according to a specific number of steps, and each group is stacked with a fixed offset distance in a lateral or longitudinal manner, forming a stepped joint structure. This structure then interlocks with the corresponding stepped joint structures of adjacent silicon steel sheet groups. During stacking, workers must sequentially stack and assemble the silicon steel sheets of the upper and lower yokes and each core column according to the set number of steps and sequence, ensuring strict alignment and flatness at the joint locations. In this field, "step-lap" is another term for "step-lap," which means that when stacked sheets are stacked, the edges are staggered by a fixed displacement. Each time a step is formed at the stacked edges of adjacent sheets, it can be called a "step-lap" between sheets. Similarly, when the edges are staggered by a fixed displacement multiple times to form multiple steps, it can be called multiple "step-laps."

[0003] This stepped, layered structure provides a certain degree of bonding strength at the joints of the core structure. However, this increases the difficulty of use in applications requiring coil replacement. Examples include: in research transformers, such as short-circuit characteristic research prototypes, where multiple disassemblies and coil replacements are needed for repeated testing; or in coil performance testing where the coil, as a component, needs to be tested with the core intact before being shipped separately. In these applications, due to the need to replace the coil, repeated yoke removal and insertion are required. This means workers must manually disassemble and install silicon steel sheets piece by piece, which not only consumes significant manpower and time but also risks accidental damage to the silicon steel sheets, ultimately affecting product performance and test results.

[0004] Therefore, the applicant recognized the need to provide a transformer core that is easier to assemble and disassemble the coils in order to solve the aforementioned problems in the prior art. Summary of the Invention

[0005] The purpose of this disclosure is to provide a transformer core that enables the rapid installation and removal of the upper yoke. Furthermore, it is hoped that a transformer core can be provided that avoids damage to the laminations during the installation and removal of the upper yoke.

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

[0007] The structure comprises: an upper yoke, arranged along a first direction and formed by stacking multiple upper yoke laminations, each lamination comprising N upper yoke laminations of identical shape, where N ≥ 2; a lower yoke, arranged parallel to the upper yoke and formed by stacking multiple lower yoke laminations, each lamination comprising N lower yoke laminations; a central pillar, arranged along a second direction perpendicular to the first direction and formed by stacking multiple central pillar laminations, each lamination comprising N central pillar laminations; a left central pillar, arranged parallel to the central pillar to the left of the central pillar and formed by stacking multiple left central pillar laminations, each lamination comprising N left central pillar laminations; and a right central pillar, arranged parallel to the central pillar to the right of the central pillar and formed by stacking multiple right central pillar laminations, each lamination comprising N right central pillar laminations.

[0008] The upper edges of the N central pillar stacks align with the central grooves of the N upper yoke stacks, and the lower edges of the N central pillar stacks align with the central grooves of the N lower yoke stacks; the upper edges of the N left central pillar stacks align with the left edges of the N upper yoke stacks, and the lower edges of the N left central pillar stacks align with the left edges of the N lower yoke stacks; furthermore, the upper edges of the N right central pillar stacks align with the right edges of the N upper yoke stacks, and the lower edges of the N right central pillar stacks align with the right edges of the N lower yoke stacks.

[0009] Specifically, N central core stacks are stacked in a stepwise manner such that the central core stacks have flush upper mating portions and stepped, staggered lower mating portions; N left core stacks are stacked in a stepwise manner such that the left core stacks have flush upper mating portions and stepped, staggered lower mating portions; N right core stacks are stacked in a stepwise manner such that the right core stacks have flush upper mating portions and stepped, staggered lower mating portions; and N upper yoke stacks have the same dimensions and are stacked in a flush manner such that the upper yoke stacks have flush upper mating portions and stepped, staggered lower mating portions. The sheet assembly has a flush center docking portion, a left docking portion, and a right docking portion, which are flush docked with the upper docking portions of the center column sheet assembly, the left center column sheet assembly, and the right center column sheet assembly; and N lower yoke sheets are stacked in a stepwise manner so that the lower yoke sheet assembly has a stepwise staggered center docking portion, a left docking portion, and a right docking portion, which are stepwise docked with the lower docking portions of the center column sheet assembly, the left center column sheet assembly, and the right center column sheet assembly.

[0010] In the transformer core according to the embodiments of this disclosure, the lower yoke is still assembled with the center column, left column, and right column using the original step-by-step stacking method. However, the upper yoke does not have staggered laminations with the center column, left column, and right column; instead, it is flush-joined with a flat mating surface. This allows for quick installation and removal of the upper yoke without damaging the laminations due to frequent installation and removal.

[0011] Specifically, the mating edges between two adjacent laminations are inclined at a 45° angle relative to the first direction.

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

[0013] Optionally, the shape of the lower edges of the N center pillar laminations is stepped, such that the lower vertices of the lower edges of the N center pillar laminations are offset by a first distance in a first direction; the length of the N left center pillar laminations is stepped, such that the lower edges of the N left center pillar laminations are offset by a first distance in a second direction; the length of the N right center pillar laminations is stepped, such that the lower edges of the N right center pillar laminations are offset by a first distance in a second direction; and the N lower yoke laminations have the same shape and are arranged in a stepped manner in a first direction such that the center slots, left edges, and right edges of the N lower yoke laminations are offset by a first distance in a stepped manner. This results in a horizontally stepped stacked transformer core.

[0014] Alternatively, the lengths of the N center pillar laminations are stepped, causing the lower edges of the N center pillar laminations to be offset by a second distance in a second direction; the lengths of the N left center pillar laminations are stepped, causing the lower edges of the N left center pillar laminations to be offset by a second distance in a second direction; the lengths of the N right center pillar laminations are stepped, causing the lower edges of the N right center pillar laminations to be offset by a second distance in a second direction; and the N lower yoke laminations have stepped lengths and stepped center slot depths, causing the left and right edges of the N lower yoke laminations to be offset by a second distance in a first direction, and the center slots of the N lower yoke laminations to be offset by a second distance in a second direction. This results in a transformer core with vertically stepped stacking.

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

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

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

[0018] Furthermore, the upper yokes are independently stacked and fixed together by a fastening device, which includes multiple yoke threading screws, and each upper yoke stack has multiple through holes through which the multiple yoke threading screws pass. This facilitates the alignment of the upper yoke stacks and ensures the structural robustness of the upper yoke, thereby facilitating the assembly and disassembly of the upper yoke.

[0019] Furthermore, it also includes a fastening clamp for clamping the upper yoke to the central post, left central post, right central post, and lower yoke. This fastening clamp includes: an upper clamping plate disposed at the top of the upper yoke; a lower clamping plate disposed at the bottom of the lower yoke; and multiple tie rods connected between the upper and lower clamping plates to provide clamping force. The upper clamping plate and the multiple tie rods are detachably connected. This facilitates both the assembly and disassembly of the upper yoke and ensures its secure installation.

[0020] In the transformer core according to the embodiments of this disclosure, the lower yoke is still assembled with the center column, left column, and right column using the original step-by-step stacking method. However, the upper yoke does not have a step-by-step connection with the center column, left column, and right column; instead, it is flush-connected with a flat mating surface. Therefore, the upper yoke can be stacked independently and can be easily joined or separated from the center column, left column, and right column without the need for workers to manually insert or remove the laminations. This achieves rapid installation and removal of the upper yoke and avoids damage to the laminations due to frequent installation and removal, saving labor and time costs while ensuring stable product performance. Attached Figure Description

[0021] The features and advantages of one or more embodiments of the present invention will become more readily apparent from 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 invention in any way. The drawings are not drawn to scale and some features may be enlarged or reduced to show detail of specific parts. In the drawings:

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

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

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

[0025] Figure 4 A schematic diagram of a vertical step stacking scheme for 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 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 the components of a core lamination unit of a single-phase transformer core according to a third embodiment of the present disclosure is shown; and

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

[0029] Explanation of icon numbers:

[0030] 10. Upper yoke laminations; 12. Lower edge of the upper yoke laminations.

[0031] 13. Center groove H, through hole

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

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

[0034] 20-2, Second lower yoke lamination; 20-3, Third lower yoke lamination

[0035] 22. Upper edge of the lower yoke laminations 23. Central groove

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

[0037] 30. Central column laminate group 30-1. First central column laminate

[0038] 30-2, Second central pillar stack; 30-3, Third central pillar stack

[0039] 31. Upper edge of the central pillar lamination 32. Lower edge of the central pillar lamination

[0040] 40. Left ventricular column stacking group 40-1. First left ventricular column stacking

[0041] 40-2, Second left ventricular column stack; 40-3, Third left ventricular column stack.

[0042] 41. Upper edge of the left ventricular column stack 42. Lower edge of the left ventricular column stack

[0043] 50. Right axial stack 50-1. First right axial stack

[0044] 50-2, Second right ventricular column stack; 50-3, Third right ventricular column stack.

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

[0046] S1, first distance; S2, second distance

[0047] 110. Upper yoke half-lapped plate; 120. Lower yoke half-lapped plate.

[0048] 120-1, First lower yoke half-laminate; 120-2, Second lower yoke half-laminate

[0049] 120-3, Third lower yoke half-laminated plate Detailed Implementation

[0050] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise.

[0052] Figure 1A simplified schematic diagram of a core lamination unit of a three-phase transformer core according to the first embodiment is shown. This core lamination unit includes upper yoke laminations, lower yoke laminations, center column laminations, left center column laminations, and right center column laminations mated together. In this document, "matting" refers to the fact that the edges of two laminations or two components are parallel and fit together in a nearly seamless manner. Here, "stepping" has the same meaning as in the art; "stepping lamination / stacking" means that when laminations are stacked, the edges are staggered by a fixed displacement. Each time a step is formed at the stacking edge of adjacent laminations, it can be called one "stepping lamination" between laminations. Similarly, when the edges are staggered by a fixed displacement multiple times to form multiple steps, it can be called multiple "stepping laminations".

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

[0054] During assembly, the upper edge 31 of the central pillar stack aligns with the central groove 13 of the upper yoke stack, and the lower edge 32 of the central pillar stack aligns with the central groove 23 of the lower yoke stack, thereby centrally positioning the central pillar between the upper and lower yokes; the upper edge 41 of the left central pillar stack aligns with the left edge 14 of the upper yoke stack, and the lower edge 42 of the left central pillar stack aligns with the left edge 24 of the lower yoke stack; and the upper edge 51 of the right central pillar stack aligns with the right edge 15 of the upper yoke stack, and the lower edge 52 of the right central pillar stack aligns with the right edge 25 of the lower yoke stack.

[0055] Specifically, the central column stack, the left central column stack, and the right central column stack are all stacked in a step-by-step manner, such that the central column stack group 30, the left central column stack group 40, and the right central column stack group 50 each have a flush upper mating portion and a step-by-step staggered lower mating portion. The flush upper mating portion includes a flat upper mating surface for mating with the flat mating surface of the upper yoke, while the step-by-step staggered lower mating portion includes a staggered lower mating surface for mating with the staggered mating surface of the lower yoke.

[0056] Furthermore, the laminations in the upper yoke lamination group 10 have the same size and are stacked flat to form a flat mating portion, which is used to mate with the flat upper mating portions of the central column lamination group 30, the left central column lamination group 40 and the right central column lamination group 50.

[0057] Meanwhile, the laminations in the lower yoke lamination group 20 are stacked in a stepwise manner to form a stepwise interlocking docking section, which docks with the stepwise interlocking lower docking sections of the central column lamination group 30, the left central column lamination group 40, and the right central column lamination group 50.

[0058] In the transformer core of this disclosure, assembled in this manner, the lower yoke is still assembled with the center column, left column, and right column using the original step-by-step stacking method. However, the upper yoke does not have staggered laminations with the center column, left column, and right column; instead, it is flush-fitted with a flat mating surface. Therefore, the upper yoke can be independently stacked and easily joined or separated from the center column, left column, and right column using hoisting machinery. This eliminates the need for manual insertion or removal of laminations, enabling quick and easy installation and removal of the upper yoke without damaging the laminations due to frequent installation and removal. This saves labor and time costs while ensuring stable product performance.

[0059] In this disclosure, the mating edges between adjacent laminations are all inclined at a 45° angle relative to the horizontal direction. In particular, the central groove 13 of the upper yoke lamination and the central groove 23 of the lower yoke lamination are both right-angled V-shaped grooves, and the upper edge 31 and lower edge 32 of the central 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 assembly of the various parts of the transformer core according to the first embodiment of this disclosure will be described in more detail. For clarity, this disclosure will use the case of N=3 as an example.

[0061] like Figure 2 and Figure 3As shown, the three central pillar stacks 30-1, 30-2, and 30-3 have lower edges 32 with progressively changing shapes. Specifically, the lower vertices of the lower edges 32 of the first central pillar stack 30-1, the second central pillar stack 30-2, and the third central pillar stack 30-3 are offset by a first distance S1 from left to right in the horizontal direction.

[0062] See Figure 3 Corresponding to the stepping changes of the three central pillar laminations 30-1, 30-2, and 30-3, three lower yoke laminations 20-1, 20-2, and 20-3 with the same shape are arranged stepwise in the horizontal direction so that their central grooves 23 accurately align with the stepwise staggered lower edges 32 of the three central pillar laminations 30-1, 30-2, and 30-3. Specifically, the central grooves 23 of the first lower yoke lamination 20-1, the second lower yoke lamination 20-2, and the third lower yoke lamination 20-3 are offset by a first distance S1 from left to right. Accordingly, the left edges 24 and right edges 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 also offset by a first distance S1 from left to right.

[0063] Corresponding to the stepped changes of the three central pillar laminations 30-1, 30-2, and 30-3, in order to accurately align with the stepped, staggered left edges 24 of the three lower yoke laminations 20-1, 20-2, and 20-3, the three left central pillar laminations 40-1, 40-2, and 40-3 have stepped lengths. Specifically, the first left central pillar lamination 40-1, the second left central pillar lamination 40-2, and the third left central pillar lamination 40-3 are stepped outwards, causing the lower edge 42 to be stepped downwards by a first distance S1 in the vertical direction.

[0064] Corresponding to the stepping changes of the three central pillar laminations 30-1, 30-2, and 30-3, in order to accurately align with the stepping, staggered right edges 25 of the three lower yoke laminations 20-1, 20-2, and 20-3, the three right central pillar laminations 50-1, 50-2, and 50-3 also have stepping length changes. Specifically, opposite to the stepping direction of the three lower yoke laminations 20-1, 20-2, and 20-3, the first right central pillar lamination 50-1, the second right central pillar lamination 50-2, and the third right central pillar lamination 50-3 are shortened step by step, causing the lower edge 52 to be shifted upward step by step by a first distance S1 in the vertical direction.

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

[0066] The first embodiment provides an optional horizontal stepping scheme, in which it can be easily achieved simply by regularly changing the shape or size of the three core columns.

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

[0068] like Figure 4 As shown, the first central pillar stack 30-1, the second central pillar stack 30-2, and the second central pillar stack 30-3 are progressively extended, such that the lower edge 32 is progressively offset downward in the vertical direction by a second distance S2; similarly, the lower edges 42 of the first left central pillar stack 40-1, the second left central pillar stack 40-2, and the third left central pillar stack 40-3 are progressively offset downward in the vertical direction by a second distance S2; and the lower edges 52 of the first right central pillar stack 50-1, the second right central pillar stack 50-2, and the third right central pillar stack 50-3 are progressively offset downward in the vertical direction by a second distance S2.

[0069] Corresponding to the step-like changes in the three central pillar stacks 30-1, 30-2, and 30-3, the three left central pillar stacks 40-1, 40-2, and 40-3, and the three right central pillar stacks 50-1, 50-2, and 50-3, to achieve accurate alignment, the three lower yoke stacks 20-1, 20-2, and 20-3 have progressively shortened lengths and progressively deeper central groove depths. Specifically, the left edge 24 and right edge 25 of the first lower yoke stack 20-1, the second lower yoke stack 20-2, and the third lower yoke stack 20-3 are progressively offset towards the center by a second distance S2 in the horizontal direction, and the depth of the central groove 23 progressively increases by a second distance S2 in the vertical direction.

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

[0071] exist Figures 1 to 4 The transformer core shown is suitable for a three-phase transformer, in which the center column, left column and right column are used to support the coils. Therefore, each upper yoke lamination and each lower yoke lamination is a wide, complete lamination.

[0072] However, the transformer core according to this disclosure can also be used in single-phase transformers, i.e., only the center post is used to support the coils. See also Figures 5 to 7 The diagram illustrates a stacking scheme for a single-phase transformer, in which the left core lamination has a width equivalent to half that of the left core lamination in a three-phase transformer, the right core lamination has a width equivalent to half that of the right core lamination in a three-phase transformer, and the final stacked left core and right core both have approximately semi-circular cross sections.

[0073] Corresponding to the aforementioned changes in the left and right core columns, in this single-phase transformer, the laminations of the upper and lower yokes also have halved widths. Thus, the depths of the central V-groove of the upper yoke and the central V-groove of the lower yoke will be exactly equal to the widths of the upper and lower yokes. In this case, as... Figure 6 As shown, each upper yoke lamination can be composed of two upper yoke half-lamps 110 of equal size, the central groove of which is defined by the adjacent edges of the two upper yoke half-lamps 110; similarly, each lower yoke lamination can be composed of two lower yoke half-lamps 120 of equal size, the central groove of which is defined by the adjacent edges of the two lower yoke half-lamps 120.

[0074] Further, see Figure 6 and Figure 7 The single-phase transformer core can be stacked using a horizontal stepping scheme as described in the first embodiment, wherein the two sets of lower yoke half-lamps 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 a vertical stepping scheme as described in the second embodiment. Specific details will not be elaborated here.

[0075] Although the first to third embodiments described above all use an N=3 scheme as an example, in practical applications, the number N of laminations in a lamination group can be, for example, 6, 7, or 8, and each lamination group can have either N lamination types or N / 2 lamination types. Taking N=6 as an example, as one implementation, the upper yoke lamination group 10, the lower yoke lamination group 20, the central column lamination group 30, the left central column lamination group 40, and the right central column lamination group 50 can each include 6 lamination types, that is, each lamination has one lamination type, and they are progressively arranged. Alternatively, the upper yoke lamination group 10, the lower yoke lamination group 20, the central column lamination group 30, the left central column lamination group 40, and the right central column lamination group 50 can each include 3 lamination types. In this case, every two laminations have the same lamination type, and they are progressively arranged every two laminations.

[0076] In the transformer core stacked according to the above embodiments of the present disclosure, the upper yoke can be independently stacked and fixed into a whole by a fastening device, wherein the fastening device may include a plurality of yoke threading screws, and each upper yoke lamination has a plurality of through holes H for the plurality of yoke threading screws to pass through. This arrangement facilitates the alignment of the upper yoke laminations and ensures the structural robustness of the upper yoke, thereby facilitating the assembly and disassembly of the upper yoke.

[0077] Furthermore, it also includes a fastening clamp for clamping and securing the independently formed upper yoke to the step-joined central post, left central post, right central post, and lower yoke. This fastening clamp includes at least: an upper clamping plate disposed at the top of the upper yoke; a lower clamping plate disposed at the bottom of the lower yoke; and multiple tie rods connecting the upper and lower clamping plates to provide clamping force between them. The upper clamping plate and the multiple tie rods are detachably connected, thus facilitating both the assembly and disassembly of the upper yoke while ensuring its secure installation.

[0078] Based on the foregoing description of specific embodiments of the transformer core according to this disclosure, the transformer core mainly includes: an upper yoke, a lower yoke, a center post, a left center post, and a right center post, wherein the upper yoke is flush with and non-overlapping with the center post, left center post, and right center post. Therefore, the step-by-step mechanism enables rapid installation and removal of the upper yoke, and avoids damage to the laminations during installation and removal of the upper yoke.

[0079] The main improvements and effects are as follows:

[0080] ① In the transformer core according to the embodiments of this disclosure, the lower yoke is still assembled with the center column, left column, and right column using the original step-by-step stacking method. However, the upper yoke does not have staggered joints with the center column, left column, and right column; instead, it is flush-joined with a flat joint surface. 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 yoke can be stacked independently and fixed by a fastening device, which facilitates the alignment of the upper yoke stacks and ensures the structural strength of the upper yoke, thus facilitating the assembly and disassembly of the upper yoke.

[0082] The various embodiments and variations of the present invention have been described in detail above. However, those skilled in the art should understand that the present invention is not limited to the specific embodiments and variations described above, but may include various other possible combinations and arrangements. Other variations and modifications can be implemented by those skilled in the art without departing from the spirit and scope of the present invention. All these variations and modifications fall within the scope of the present invention. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A power transformer core, comprising: The upper yoke is arranged along a first direction and is formed by stacking multiple upper yoke stacks (10), each upper yoke stack (10) comprising N upper yoke stacks of the same shape, wherein N≥2; The lower yoke is arranged parallel to the upper yoke and is formed by stacking multiple lower yoke laminations (20), each lower yoke lamination (20) comprising N stacked lower yoke laminations. A central column is arranged along a second direction perpendicular to the first direction and is formed by stacking multiple central column stacks (30), each central column stack (30) comprising N stacked central column pieces; A left atrial column, arranged parallel to the left side of the central column, and composed of multiple stacked left atrial column lamination groups (40), each left atrial column lamination group (40) comprising N stacked left atrial column laminations; and The right-heart column is arranged parallel to the center column on the right side of the center column and is composed of multiple right-heart column stacks (50), each right-heart column stack (50) comprising N stacked right-heart column pieces. The upper edge (31) of the N central pillar stacks is connected to the central groove (13) of the N upper yoke stacks, and the lower edge (32) of the N central pillar stacks is connected to the central groove (23) of the N lower yoke stacks. The upper edges (41) of the N left-center stacks align with the left edges (14) of the N upper yoke stacks, and the lower edges (42) of the N left-center stacks align with the left edges (24) of the N lower yoke stacks; and The upper edge (51) of the N right-center column laminations aligns with the right edge (15) of the N upper yoke laminations, and the lower edge (52) of the N right-center column laminations aligns with the right edge (25) of the N lower yoke laminations. Its features are, The N central pillar laminations are stacked in a stepwise manner to form a central pillar lamination group (30) having a flush upper mating portion and a stepwise staggered lower mating portion; The N left-heart column laminations are stacked in a stepwise manner such that the left-heart column lamination group (40) has a flush upper mating portion and a stepwise staggered lower mating portion; The N right-center column laminations are stacked in a stepwise manner such that the right-center column lamination group (50) has a flush upper mating portion and a stepwise staggered lower mating portion; The N upper yoke laminations have the same size and are stacked flush, such that the upper yoke lamination group (10) has a flush center joint, a left joint, and a right joint, so as to be flush with the upper joint of the center pillar lamination group (30), the upper joint of the left center pillar lamination group (40), and the upper joint of the right center pillar lamination group (50); and The N lower yoke laminations are stacked in a stepwise manner such that the lower yoke lamination group (20) has a stepped, staggered center docking portion, left docking portion and right docking portion, so as to perform stepwise docking with the lower docking portion of the center pillar lamination group (30), the lower docking portion of the left center pillar lamination group (40) and the lower docking portion of the right center pillar lamination group (50).

2. The power transformer core according to claim 1, characterized in that, The mating edges between two adjacent laminations are inclined at a 45° angle 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 right-angled and has a lower vertex, and the central groove (23) of each lower yoke lamination is a right-angled V-shaped groove.

4. The power transformer core according to claim 3, characterized in that, The N central pillar stacks have lower edges (32) with progressively changing shapes, such that the lower vertices of the lower edges (32) of the N central pillar stacks are progressively offset by a first distance (S1) in the first direction. The N left-heart column stacks have progressively varying lengths, such that the lower edges (42) of the N left-heart column stacks are progressively offset by the first distance (S1) in the second direction; The N right-heart column laminations have progressively varying lengths, such that the lower edges (52) of the N right-heart column laminations are progressively offset by the first distance (S1) in the second direction; and The N lower yoke laminations have the same shape and are arranged in a stepwise manner in the first direction, such that the center groove (23), left edge (24) and right edge (25) of the N lower yoke laminations are offset in a stepwise manner by the first distance (S1).

5. The power transformer core according to claim 3, characterized in that, The N central pillar stacks have progressively varying lengths, such that the lower edges (32) of the N central pillar stacks are progressively offset by a second distance (S2) in the second direction; The N left-heart column stacks have progressively varying lengths, such that the lower edges (42) of the N left-heart column stacks are progressively offset by the second distance (S2) in the second direction; The N right-heart column laminations have progressively varying lengths, such that the lower edges (52) of the N right-heart column laminations are progressively offset by the second distance (S2) in the second direction; and The N lower yoke stacks have progressively varying lengths and progressively varying center groove depths, such that the left edge (24) and right edge (25) of the N lower yoke stacks are progressively offset by the second distance (S2) in the first direction, and the center groove of the N lower yoke stacks is progressively 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 in a three-phase transformer, wherein the center column, the left core column and the right core column are all used to support the coils, and each upper yoke lamination and each lower yoke lamination are wide, complete laminations.

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

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

9. The power transformer core according to any one of claims 1 to 5, characterized in that, The upper yokes are stacked and fixed by a fastening device, wherein the fastening device includes a plurality of yoke threading screws, and each upper yoke stack has a plurality of through holes (H) through which the plurality of yoke threading screws pass.

10. The power transformer core according to claim 9, characterized in that, The power transformer core further includes a fastening clamp for clamping the upper yoke to the center post, the left center post, the right center post, and the lower yoke, the fastening clamp comprising: Upper clamping plate, arranged on top of the upper yoke; Lower clamping plate, arranged at the bottom of the lower yoke; and Multiple pull rods are connected between the upper clamping plate and the lower clamping plate to provide clamping force, wherein the upper clamping plate and the multiple pull rods are detachably connected.

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