Laminated cylindrical B-shaped iron core structure and three-phase electric energy filter adopting same

Abstract

The utility model discloses a laminated cylindrical iron core structure shaped like a Chinese character'ri 'and a three-phase electric energy filter adopting the laminated cylindrical iron core structure. A plurality of silicon steel sheets shaped like the Chinese character'ri' are laminated and sequentially stacked up and down in the vertical column direction in a mode of sharing a central axis to form three iron core columns, and the three iron core columns and an upper square iron yoke and a lower square iron yoke form an integral iron core shaped like the Chinese character'ri '. The lengths of the plurality of silicon steel sheet laminations on each iron core column are gradually reduced from the middle position to the two sides of the lamination, and the distance difference between the vertex of the plurality of silicon steel sheet laminations on the cross section of each iron core column and the central point of the iron core column is within a preset range, so that the overall appearance of each iron core column is in the shape of a cylinder with steps; the winding section of the coil on each iron core column is circular or approximately circular, so that the coil is more convenient to wind, the length of each circle of wound coil is shortened, the internal resistance of the coil is reduced, and the temperature rise is reduced. Moreover, the stacked iron cores are provided with positioning holes which vertically penetrate through all the silicon steel sheet laminations, so that the iron cores can be conveniently installed and fixed with a lamination clamp.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer cores of electric energy filters, and particularly to a laminated cylindrical figure-eight core structure. In addition, it also relates to a three-phase electric energy filter adopting the above-mentioned laminated cylindrical figure-eight core structure. Background Technique

[0002] At present, the transformer cores of three-phase electric energy filters usually adopt E-type core structures. Two silicon steel sheets are spliced into a figure-eight silicon steel sheet and stacked. For example, patent CN210956330U discloses an E-type silicon steel sheet core, which is formed by symmetrically splicing a number of first E-type silicon steel sheets and second E-type silicon steel sheets into a figure-eight structure and stacking them. The two symmetric E-type silicon steel sheets are spliced by means of bumps and grooves, which can improve the splicing efficiency. However, since the E-type core adopts a stacked structure with the same size up and down, the cross-sectional shape of the coil wound on the core is rectangular, which is inconvenient for coil winding, and the winding length of the coil is long, the internal resistance is large, and the temperature rise is high. In addition, since the E-type core structure forms a figure-eight silicon steel sheet by splicing, when the magnetic lines of force run in the core and yoke, they need to cross the magnetic resistance of the splicing interface, resulting in large magnetic losses and low efficiency. Content of the Utility Model

[0003] The utility model provides a laminated cylindrical figure-eight core structure and a three-phase electric energy filter adopting the same, making the overall shape of each core column a stepped cylindrical shape, and the cross-sectional shape of the coil wound on each core column is circular or approximately circular, which is more convenient for coil winding, shortening the length of each turn of the coil wound, reducing the internal resistance of the coil, lowering the temperature rise, and having the advantages of small volume and light weight.

[0004] According to one aspect of the utility model, a laminated cylindrical figure-eight core structure is provided, including a plurality of figure-eight silicon steel sheet laminations. The plurality of silicon steel sheet laminations are stacked one above the other in a concentric axis manner in the column direction to form three core columns. The width of the plurality of silicon steel sheet laminations on each core column gradually decreases from the middle position of the stack to both sides. The distance difference between the vertex of the cross-section of the plurality of silicon steel sheet laminations on each core column and the center point of the core column is within a preset range, and positioning holes penetrating all the silicon steel sheet laminations are provided at the upper and lower yokes of the stacked core for easy installation and fixation with a lamination fixture.

[0005] Further, the circumscribed contour of the vertex of the cross-section of the plurality of silicon steel sheet laminations on each core column is circular.

[0006] Further, each silicon steel sheet lamination is stacked by a plurality of integral figure-eight silicon steel sheets.

[0007] Furthermore, the multiple silicon steel sheet stacks include a first silicon steel sheet layer, a second silicon steel sheet layer, a third silicon steel sheet layer, a fourth silicon steel sheet layer, a fifth silicon steel sheet layer and a sixth silicon steel sheet layer, the first silicon steel sheet layer is located in the middle position of the stack, the second silicon steel sheet layer, the third silicon steel sheet layer, the fourth silicon steel sheet layer, the fifth silicon steel sheet layer and the sixth silicon steel sheet layer are stacked in sequence from the inside to the outside on both sides of the first silicon steel sheet layer, and all the silicon steel sheet layers have the same width at the two iron yokes.

[0008] Furthermore, the overall length of the first silicon steel sheet layer is 420mm-430mm, the length of the middle opening is 60mm-70mm, and the thickness is 30mm-35mm; the overall length of the second silicon steel sheet layer is 410mm-419mm, the length of the middle opening is 71mm-80mm, and the thickness is 8mm-13mm; the overall length of the third silicon steel sheet layer is 400mm-409mm, the length of the middle opening is 81mm-90mm, and the thickness is 4mm-8mm; the overall length of the fourth silicon steel sheet layer is 390mm-399mm, the length of the middle opening is 91mm-100mm, and the thickness is 4mm-7mm; the overall length of the fifth silicon steel sheet layer is 380mm-389mm, the length of the middle opening is 101mm-110mm, and the thickness is 3mm-6mm; the overall length of the sixth silicon steel sheet layer is 360mm-370mm, the length of the middle opening is 120mm-130mm, and the thickness is 4mm-8mm.

[0009] Furthermore, the overall length of the first silicon steel sheet layer is 425 mm, the middle opening length is 62 mm, and the thickness is 33 mm; the overall length of the second silicon steel sheet layer is 415 mm, the middle opening length is 72 mm, and the thickness is 11 mm; the overall length of the third silicon steel sheet layer is 405 mm, the middle opening length is 82 mm, and the thickness is 6 mm; the overall length of the fourth silicon steel sheet layer is 395 mm, the middle opening length is 92 mm, and the thickness is 5 mm; the overall length of the fifth silicon steel sheet layer is 385 mm, the middle opening length is 102 mm, and the thickness is 4 mm; the overall length of the sixth silicon steel sheet layer is 365 mm, the middle opening length is 122 mm, and the thickness is 6 mm.

[0010] Furthermore, the first silicon steel sheet layer is formed by stacking 138 0.23 mm thick "S"-shaped silicon steel sheets on top of each other, the second silicon steel sheet layer is formed by stacking 46 0.23 mm thick "S"-shaped silicon steel sheets on top of each other, the third silicon steel sheet layer is formed by stacking 25 0.23 mm thick "S"-shaped silicon steel sheets on top of each other, the fourth silicon steel sheet layer is formed by stacking 21 0.23 mm thick "S"-shaped silicon steel sheets on top of each other, the fifth silicon steel sheet layer is formed by stacking 17 0.23 mm thick "S"-shaped silicon steel sheets on top of each other, and the sixth silicon steel sheet layer is formed by stacking 25 0.23 mm thick "S"-shaped silicon steel sheets on top of each other.

[0011] Furthermore, the number of the positioning holes is six, and they are symmetrically arranged in pairs.

[0012] In addition, the utility model also provides a three-phase power filter, including a main input switch QF1 and a transformer T1, the input end of the transformer T1 is connected to the three phase lines and one neutral line of the mains, and the output end is connected to the load. The main input switch is arranged between the three-phase power supply line of the mains and the input end of the transformer T1, and the transformer T1 adopts the laminated cylindrical Japanese-shaped iron core structure as described above.

[0013] Furthermore, it includes a dual power conversion switch QF2, one input end of the dual power conversion switch QF2 is connected to the output end of the transformer T1, the other input end is connected to the mains three-phase power supply line, and the output end is connected to the load.

[0014] The utility model has the following beneficial effects:

[0015] The laminated cylindrical 'S'-shaped iron core structure of the present invention is formed by stacking multiple 'S'-shaped silicon steel sheet laminates in a coaxial manner in the column direction to form three iron core columns, which are then combined with two upper and lower square iron yokes to form a 'S'-shaped integral iron core. The length of the multiple silicon steel sheet laminates on each iron core column gradually decreases from the middle position of the stack to the sides, and the difference in distance between the vertices of the multiple silicon steel sheet laminates on the cross section of each iron core column and the center point of the iron core column is within a preset range, so that the overall shape of each iron core column is a cylindrical shape with steps. The winding cross-section of the coil wrapped around each iron core column is circular or approximately circular, making coil winding more convenient, shortening the length of each coil, reducing the internal resistance of the coil, and lowering the temperature rise, with the advantages of small size and light weight. In addition, the stacked iron core is provided with positioning holes that pass through all the silicon steel sheet laminates to facilitate installation and fixation with the lamination clamp, which is conducive to improving the stacking efficiency of the iron core.

[0016] In addition, the three-phase electric energy filter of the present invention also has the above advantages.

[0017] In addition to the purposes, features and advantages described above, the present utility model has other purposes, features and advantages. The following will refer to the drawings to further elaborate on the present utility model in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0019] Figure 1 is a schematic three-dimensional structural principle diagram of the laminated cylindrical figure-eight-shaped iron core structure of the preferred embodiment of this application.

[0020] Figure 2 is Figure 1 a structural schematic diagram of the laminated cylindrical figure-eight-shaped iron core structure disconnected from the middle in the width direction.

[0021] Figure 3 is a schematic front-view structural principle diagram of the laminated cylindrical figure-eight-shaped iron core structure of the preferred embodiment of this application.

[0022] Figure 4 is a schematic left-view structural principle diagram of the laminated cylindrical figure-eight-shaped iron core structure of the preferred embodiment of this application.

[0023] Figure 5 is a schematic top-view structural principle diagram of the laminated cylindrical figure-eight-shaped iron core structure of the preferred embodiment of this application.

[0024] Figure 6 is Figure 5 a schematic sectional dimension diagram cut along A-A.

[0025] Figure 7 is a schematic sectional dimension diagram of the first silicon steel sheet layer of the preferred embodiment of this application.

[0026] Figure 8 is a schematic sectional dimension diagram of the second silicon steel sheet layer of the preferred embodiment of this application.

[0027] Figure 9 is a schematic sectional dimension diagram of the third silicon steel sheet layer of the preferred embodiment of this application.

[0028] Figure 10 is a schematic sectional dimension diagram of the fourth silicon steel sheet layer of the preferred embodiment of this application.

[0029] Figure 11 is a schematic sectional dimension diagram of the fifth silicon steel sheet layer of the preferred embodiment of this application.

[0030] Figure 12 is a schematic sectional dimension diagram of the sixth silicon steel sheet layer of the preferred embodiment of this application.

[0031] Figure 13 This is a schematic diagram of the circuit principle of a three-phase power filter according to another embodiment of the present application.

[0032] Description of Reference Numerals

[0033] 1. Iron core column; 2. Positioning hole; 3. First silicon steel sheet layer; 4. Second silicon steel sheet layer; 5. Third silicon steel sheet layer; 6. Fourth silicon steel sheet layer; 7. Fifth silicon steel sheet layer; 8. Sixth silicon steel sheet layer. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] Reference Figures 1 to 6 As shown, a preferred embodiment of the present application provides a laminated cylindrical 'S' shaped iron core structure, comprising a plurality of 'S' shaped silicon steel sheet stacks, wherein the plurality of silicon steel sheet stacks are stacked up and down in the column direction in a manner of a common central axis and form three iron core columns 1, the three iron core columns 1 having the same structure and shape, the coil being wound on each iron core column 1, the length of the plurality of silicon steel sheet stacks on each iron core column 1 gradually decreasing from the middle position of the stack to both sides, the distance difference between the vertices of the plurality of silicon steel sheet stacks on the cross section of each iron core column 1 and the center point of the iron core column 1 being within a preset range, and the stacked iron core is provided with positioning holes 2 that pass through all silicon steel sheet layers from top to bottom, so as to facilitate installation and fixation with the lamination fixture, and facilitate stacking. Among them, the distance difference refers to the absolute value of the distance difference between the two vertices and the center point, and the preset range of the distance difference is 0 to 10 mm, which can be set according to actual needs. In addition, the upper and lower iron yokes of the laminated cylindrical 'S' shaped iron core structure are square, which is also convenient for fixing the lamination fixture.

[0036] It can be understood that the laminated cylindrical 'S'-shaped iron core structure of this embodiment is formed by stacking multiple 'S'-shaped silicon steel sheet laminates in the column direction in a manner of co-centering the axis to form three iron core columns 1. The length of the multiple silicon steel sheet laminates on each iron core column 1 gradually decreases from the middle position of the stack to both sides, and the difference in distance between the vertices of the multiple silicon steel sheet laminates on the cross section of each iron core column 1 and the center point of the iron core column 1 is within a preset range, so that the overall shape of each iron core column 1 is a cylindrical shape with steps. The winding cross-section of the coil wound on each iron core column 1 is circular or approximately circular, making coil winding more convenient, shortening the length of each coil, reducing the internal resistance of the coil, and reducing the temperature rise, with the advantages of small size and light weight. In addition, the stacked iron core is provided with positioning holes 2 that pass through all the silicon steel sheet laminates from top to bottom to facilitate installation and fixation with the lamination fixture, which is conducive to improving the stacking efficiency of the iron core.

[0037] Among them, the number of the positioning holes 2 is multiple, and they are arranged symmetrically in pairs, which is beneficial to improving the stability of the stacking operation and the uniformity of the stacking pressure. Preferably, the number of the positioning holes 2 is six, and the three groups of symmetrically distributed positioning holes 2 are evenly spaced along the length direction of the E-shaped silicon steel sheet layer.

[0038] It can be understood that after multiple silicon steel sheets are stacked to form a laminated cylindrical E-shaped iron core structure, the iron core is wrapped and tightened with a sand belt and then the coil is wound. The coils are respectively wound on the three iron core columns 1. Among them, the circumscribed contour of the vertices of the multiple silicon steel sheet laminations on the cross-section of each iron core column 1 is circular, elliptical or kidney-shaped, so that the cross-sectional shape of the coil wound on the circular iron core structure is circular, elliptical or kidney-shaped. Compared with the rectangular cross-sectional shape of the existing coil, the length of each turn of the coil is shortened, the internal resistance of the coil is reduced, the temperature rise is lowered, and the coil winding is more convenient. Preferably, as Figure 6 shown, the circumscribed contour of the vertices of the multiple silicon steel sheet laminations on the cross-section of each iron core column 1 is circular, so that the cross-sectional shape of the coil wound on the circular iron core structure is circular, and the winding length of each turn of the coil is the shortest.

[0039] Among them, each silicon steel sheet layer is formed by stacking multiple integral (i.e., whole-piece) E-shaped silicon steel sheets in a concentric axis manner. By stacking multiple thin silicon steel sheets with the same size to form a silicon steel sheet layer, it is beneficial to improving the performance of the iron core. And each thin silicon steel sheet is an integral E-shaped, without splicing joints. The single-turn iron core is closed, and the magnetic lines of force form a closed loop along the E-shaped plane of each silicon steel sheet layer, eliminating the magnetic resistance, reducing the magnetic loss, and can move with almost "zero" magnetic resistance, greatly increasing the magnetic flux of the transformer, reducing the iron core loss and the heating phenomenon, improving the efficiency of the iron core. In addition, the magnetostrictive stress is easily absorbed, which can ensure no noise in the application. Of course, in other embodiments, each silicon steel sheet layer can also adopt a thick single silicon steel sheet, and each silicon steel sheet can also adopt an E-shaped splicing structure.

[0040] Specifically, the multiple silicon steel sheet stacks include a first silicon steel sheet layer 3, a second silicon steel sheet layer 4, a third silicon steel sheet layer 5, a fourth silicon steel sheet layer 6, a fifth silicon steel sheet layer 7 and a sixth silicon steel sheet layer 8. The first silicon steel sheet layer 3 is located in the middle of the stack, and the second silicon steel sheet layer 4, the third silicon steel sheet layer 5, the fourth silicon steel sheet layer 6, the fifth silicon steel sheet layer 7 and the sixth silicon steel sheet layer 8 are stacked in sequence from the inside to the outside on both sides of the first silicon steel sheet layer 3. The overall width of all silicon steel sheets is the same and the width of the middle opening is the same. Among them, the overall length of the first silicon steel sheet layer 3 is 420mm-430mm, the length of the middle opening is 60mm-70mm, and the thickness is 30mm-35mm; the overall length of the second silicon steel sheet layer 4 is 410mm-419mm, the length of the middle opening is 71mm-80mm, and the thickness is 8mm-13mm; the overall length of the third silicon steel sheet layer 5 is 400mm-409mm, the length of the middle opening is 81mm-90mm, and the thickness is 4mm-8mm. The fourth silicon steel sheet layer 6 has an overall length of 390 mm to 399 mm, a middle opening length of 91 mm to 100 mm, and a thickness of 4 mm to 7 mm. The fifth silicon steel sheet layer 7 has an overall length of 380 mm to 389 mm, a middle opening length of 101 mm to 110 mm, and a thickness of 3 mm to 6 mm. The sixth silicon steel sheet layer 8 has an overall length of 360 mm to 370 mm, a middle opening length of 120 mm to 130 mm, and a thickness of 4 mm to 8 mm.

[0041] As a preference, combined Figures 7 to 12As shown, the first silicon steel sheet layer 3 has an overall length of 425 mm, a middle opening length of 62 mm, and a thickness of 33 mm; the second silicon steel sheet layer 4 has an overall length of 415 mm, a middle opening length of 72 mm, and a thickness of 11 mm; the third silicon steel sheet layer 5 has an overall length of 405 mm, a middle opening length of 82 mm, and a thickness of 6 mm; the fourth silicon steel sheet layer 6 has an overall length of 395 mm, a middle opening length of 92 mm, and a thickness of 5 mm; the fifth silicon steel sheet layer 7 has an overall length of 385 mm, a middle opening length of 102 mm, and a thickness of 4 mm; and the sixth silicon steel sheet layer 8 has an overall length of 365 mm, a middle opening length of 122 mm, and a thickness of 6 mm. The first silicon steel sheet layer 3 is composed of 138 0.23mm thick, "S"-shaped silicon steel sheets stacked one on top of the other; the second silicon steel sheet layer 4 is composed of 46 0.23mm thick, "S"-shaped silicon steel sheets stacked one on top of the other; the third silicon steel sheet layer 5 is composed of 25 0.23mm thick, "S"-shaped silicon steel sheets stacked one on top of the other; the fourth silicon steel sheet layer 6 is composed of 21 0.23mm thick, "S"-shaped silicon steel sheets stacked one on top of the other; the fifth silicon steel sheet layer 7 is composed of 17 0.23mm thick, "S"-shaped silicon steel sheets stacked one on top of the other; and the sixth silicon steel sheet layer 8 is composed of 25 0.23mm thick, "S"-shaped silicon steel sheets stacked one on top of the other. It is understood that each silicon steel sheet has an insulating coating on its surface to ensure insulation between adjacent sheets. It is understood that the resulting stacked cylindrical "S"-shaped core structure has a length of 425mm, a width of 415mm, and a thickness of 97mm. In addition, the silicon steel sheet is preferably a cold-rolled oriented silicon steel sheet, which has a very high magnetic permeability.

[0042] In addition, if Figure 13 As shown, another embodiment of the present application also provides a three-phase power filter, comprising a main input switch QF1 and a transformer T1. The input end of the transformer T1 is connected to the three phase lines and one neutral line of the mains power supply, and the output end is connected to the load. The main input switch is arranged between the three-phase mains power supply line and the input end of the transformer T1. The transformer T1 adopts the laminated cylindrical spherical iron core structure described above. The main input switch QF1 is used to control the on and off of the mains power supply line, and the transformer T1 is used to safely filter the three-phase mains power, converting dangerous three-phase alternating current into safe three-phase alternating current. Because the live and neutral lines at the output end of the transformer T1 have large impedance to ground, the ground current of each phase after conversion is less than the safe current value for the human body. If a person touches a single live or neutral line, there will be no electric shock accident. The specific filtering principle is prior art and will not be repeated here. Please refer to the patent CN208837572U previously applied for by the applicant. In addition, the transformer T1 can also be connected to the mains ground line, and the output end also includes a ground line.

[0043] Optionally, the three-phase power filter further includes a dual power conversion switch QF2, one input of which is connected to the output of transformer T1, the other input of which is connected to the three-phase mains power supply line, and the output of which is connected to the load. The dual power conversion switch QF2 is electrically connected to a controller (not shown), and the controller can control the dual power conversion switch QF2 to switch the power supply to the load. For example, when the controller outputs a control signal to the control port YJ1 of the dual power conversion switch QF2, the dual power conversion switch QF2 is switched to connect to the output of transformer T1; and when the controller outputs a control signal to the control port YJ2 of the dual power conversion switch QF2, the dual power conversion switch QF2 is switched to connect to the mains power. When the three-phase power filter is operating normally, the controller can control the dual power conversion switch QF2 to switch to connect to the output of transformer T1, at which point filtered safe AC power is output to the load. When the three-phase power filter fails, the controller controls the dual power conversion switch QF2 to switch to connect to the mains power, at which point the mains power provides emergency power to the load. In addition, the controller can also control the dual power conversion switch QF2 to be suspended, at which time no electric energy is output and power supply to the load is stopped.

[0044] In addition, current transformers CT1, CT2, and CT3 are installed on the three phase lines of the mains power supply, and current transformers CT4, CT5, and CT6 are installed on the three output phase lines of transformer T1 to monitor the input and output currents of transformer T1. Current transformers CT1, CT2, CT3, CT4, CT5, and CT6 are all electrically connected to the controller. When the output current of any phase of transformer T1 is detected to be outside the specified range, the controller controls the dual-power transfer switch QF2 to switch to the mains power supply, which provides emergency power. Furthermore, a leakage current transformer LD1 is installed at the output end of dual-power transfer switch QF2 to monitor leakage current. Furthermore, fuses F1, F2, F3, and F4 are installed on the four mains power supply lines, and fuses F5, F6, F7, and F8 are installed on the four output lines of transformer T4 to provide single-phase overcurrent protection.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A laminated cylindrical spherical iron core structure, characterized in that: It includes multiple silicon steel sheet laminations in the shape of a Chinese character "ri", and the multiple silicon steel sheet laminations are stacked one above the other in sequence in the direction of the upright column in a way of sharing the same central axis to form three iron core columns (1). The width of the multiple silicon steel sheet laminations on each iron core column (1) gradually decreases from the middle position of the stack to both sides. The distance difference between the vertex on the cross-section of each iron core column (1) of the multiple silicon steel sheet laminations and the center point of the iron core column (1) is within a preset range, and positioning holes (2) penetrating through all the silicon steel sheet laminations are provided at the upper and lower yokes of the stacked iron core to facilitate installation and fixation with the lamination fixture.

2. The laminated cylindrical 'S' shaped core structure according to claim 1, wherein: The circumscribed contour of the vertex on the cross-section of each iron core column (1) of the multiple silicon steel sheet laminations is circular.

3. The laminated cylindrical "S"-shaped iron core structure according to claim 1, characterized in that: Each silicon steel sheet lamination is stacked by multiple integral Chinese character "ri"-shaped silicon steel sheets.

4. The laminated cylindrical "S"-shaped iron core structure according to claim 1, characterized in that: The multiple silicon steel sheet laminations include a first silicon steel sheet layer (3), a second silicon steel sheet layer (4), a third silicon steel sheet layer (5), a fourth silicon steel sheet layer (6), a fifth silicon steel sheet layer (7) and a sixth silicon steel sheet layer (8). The first silicon steel sheet layer (3) is located at the very middle position of the stack. The second silicon steel sheet layer (4), the third silicon steel sheet layer (5), the fourth silicon steel sheet layer (6), the fifth silicon steel sheet layer (7) and the sixth silicon steel sheet layer (8) are stacked in sequence from the inside to the outside on both sides of the first silicon steel sheet layer (3). The widths of all the silicon steel sheet layers at the two yokes are the same.

5. The laminated cylindrical "S"-shaped iron core structure according to claim 4, characterized in that: The overall length of the first silicon steel sheet layer (3) is 420 mm to 430 mm, the length of the middle opening is 60 mm to 70 mm, and the thickness is 30 mm to 35 mm. The overall length of the second silicon steel sheet layer (4) is 410 mm to 419 mm, the length of the middle opening is 71 mm to 80 mm, and the thickness is 8 mm to 13 mm. The overall length of the third silicon steel sheet layer (5) is 400 mm to 409 mm, the length of the middle opening is 81 mm to 90 mm, and the thickness is 4 mm to 8 mm. The overall length of the fourth silicon steel sheet layer (6) is 390 mm to 399 mm, the length of the middle opening is 91 mm to 100 mm, and the thickness is 4 mm to 7 mm. The overall length of the fifth silicon steel sheet layer (7) is 380 mm to 389 mm, the length of the middle opening is 101 mm to 110 mm, and the thickness is 3 mm to 6 mm. The overall length of the sixth silicon steel sheet layer (8) is 360 mm to 370 mm, the length of the middle opening is 120 mm to 130 mm, and the thickness is 4 mm to 8 mm.

6. The laminated cylindrical "S"-shaped iron core structure according to claim 5, characterized in that: The first silicon steel sheet layer (3) has an overall length of 425 mm, a middle opening length of 62 mm, and a thickness of 33 mm; the second silicon steel sheet layer (4) has an overall length of 415 mm, a middle opening length of 72 mm, and a thickness of 11 mm; the third silicon steel sheet layer (5) has an overall length of 405 mm, a middle opening length of 82 mm, and a thickness of 6 mm; the fourth silicon steel sheet layer (6) has an overall length of 395 mm, a middle opening length of 92 mm, and a thickness of 5 mm; the fifth silicon steel sheet layer (7) has an overall length of 385 mm, a middle opening length of 102 mm, and a thickness of 4 mm; and the sixth silicon steel sheet layer (8) has an overall length of 365 mm, a middle opening length of 122 mm, and a thickness of 6 mm.

7. The laminated cylindrical "S"-shaped iron core structure according to claim 6, characterized in that: The first silicon steel sheet layer (3) is formed by stacking 138 0.23 mm thick Chinese-shaped silicon steel sheets, the second silicon steel sheet layer (4) is formed by stacking 46 0.23 mm thick Chinese-shaped silicon steel sheets, the third silicon steel sheet layer (5) is formed by stacking 25 0.23 mm thick Chinese-shaped silicon steel sheets, the fourth silicon steel sheet layer (6) is formed by stacking 21 0.23 mm thick Chinese-shaped silicon steel sheets, the fifth silicon steel sheet layer (7) is formed by stacking 17 0.23 mm thick Chinese-shaped silicon steel sheets, and the sixth silicon steel sheet layer (8) is formed by stacking 25 0.23 mm thick Chinese-shaped silicon steel sheets.

8. The laminated cylindrical "S"-shaped iron core structure according to claim 1, wherein: The number of the positioning holes (2) is six, and they are symmetrically arranged in pairs.

9. A three-phase power filter, characterized in that: It includes a main input switch QF1 and a transformer T1. The input end of the transformer T1 is connected to the three phase lines of the mains in a triangle, and the output end is connected to the load. The main input switch is arranged between the three-phase mains power supply line and the input end of the transformer T1. The transformer T1 adopts the laminated cylindrical Japanese-shaped iron core structure according to any one of claims 1 to 8.

10. The three-phase power filter according to claim 9, characterized in that: It also includes a dual power conversion switch QF2, one input end of which is connected to the output end of the transformer T1, the other input end is connected to the three-phase mains power supply line, and the output end is connected to the load.

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