Stacked cylinder annular iron core structure and single-phase electric energy filter adopting same

Abstract

The utility model discloses a laminated cylinder annular iron core structure and a single-phase electric energy filter employing the same, the laminated cylinder annular iron core structure is formed by sequentially stacking a plurality of annular silicon steel sheet layers up and down in a mode of sharing a central axis, magnetic lines of force form a circular closed loop along the annular plane of each silicon steel sheet layer, magnetic resistance is eliminated, and magnetic loss is reduced. Moreover, the diameters of the outer circles of the plurality of silicon steel sheet layers are gradually reduced from the middle position to the two sides of the stack, the diameters of the inner holes are gradually increased from the middle position to the two sides of the stack, and the distance difference between the vertexes of the single-side sections of the plurality of silicon steel sheet layers and the central point of the middle silicon steel sheet layer is within a preset range. The whole appearance of the laminated cylinder annular iron core structure is in a cylindrical ring shape with steps, the winding section of the coil wound on the iron core is round, 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, the efficiency is improved, the temperature rise is reduced, and the laminated cylinder annular iron core structure has the advantages of being high in efficiency, small in size and light in weight.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer cores of power filters, and particularly to a stacked cylinder-shaped toroidal core structure. In addition, the utility model particularly relates to a single-phase power filter adopting the stacked cylinder-shaped toroidal core structure. Background Art

[0002] At present, the transformer core of a power filter usually uses a long strip of silicon steel sheet to be wound into a cuboid toroidal core layer by layer from the inside to the outside, and then the coil is wound around the cuboid toroidal core. The cross-sectional shape of the coil winding is rectangular, which is inconvenient for winding the coil. The winding length of the coil is long, the internal resistance is large, and the temperature rise is high. In addition, the single-turn core is not closed, and the magnetic lines of force need to pass through adjacent layers to achieve closure, resulting in magnetic resistance and large magnetic losses. In addition, the existing single-phase power filter cannot provide emergency power supply to the user load when a fault occurs, and there is no leakage current monitoring, so there is a risk of electric shock once leakage occurs. Content of the Utility Model

[0003] The utility model provides a stacked cylinder-shaped toroidal core structure and a single-phase power filter adopting the same. The magnetic lines of force form a closed-loop movement along the circular ring plane of each silicon steel sheet layer, eliminating magnetic resistance and reducing magnetic losses. The cross-sectional shape of the coil wound around the stacked cylinder-shaped toroidal core structure is circular, which is more convenient for winding the coil, shortening the length of each turn of the wound coil, reducing the internal resistance of the coil, improving the efficiency, and reducing the temperature rise. It has the advantages of high efficiency, small volume, and light weight.

[0004] According to one aspect of the utility model, a stacked cylinder-shaped toroidal core structure is provided, which includes a plurality of circular ring-shaped silicon steel sheet layers. The plurality of silicon steel sheet layers are stacked one above the other in a concentric axis manner. The outer diameter dimensions of the plurality of silicon steel sheet layers gradually decrease from the middle position of the stack to both sides, and the inner hole diameter dimensions of the plurality of silicon steel sheet layers gradually increase from the middle position of the stack to both sides. The distance difference between the vertex of the single-side cross-section of the plurality of silicon steel sheet layers and the center point of the middlemost silicon steel sheet layer is within a preset range.

[0005] Furthermore, the cross-sectional shape of the coil wound around the stacked cylinder-shaped toroidal core structure is circular or approximately circular.

[0006] Furthermore, each silicon steel sheet layer is formed by stacking a plurality of silicon steel sheets in a concentric axis manner one above the other.

[0007] Further, the multiple silicon steel sheet layers 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 at the very middle position of the stack, and 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.

[0008] Further, the outer diameter of the first silicon steel sheet layer is 275 mm to 285 mm, the inner hole diameter is 75 mm to 85 mm, and the thickness is 30 mm to 35 mm. The outer diameter of the second silicon steel sheet layer is 265 mm to 274 mm, the inner hole diameter is 86 mm to 95 mm, and the thickness is 8 mm to 13 mm. The outer diameter of the third silicon steel sheet layer is 255 mm to 264 mm, the inner hole diameter is 96 mm to 105 mm, and the thickness is 4 mm to 8 mm. The outer diameter of the fourth silicon steel sheet layer is 245 mm to 254 mm, the inner hole diameter is 106 mm to 115 mm, and the thickness is 4 mm to 7 mm. The outer diameter of the fifth silicon steel sheet layer is 235 mm to 244 mm, the inner hole diameter is 116 mm to 124 mm, and the thickness is 3 mm to 6 mm. The outer diameter of the sixth silicon steel sheet layer is 215 mm to 225 mm, the inner hole diameter is 135 mm to 144 mm, and the thickness is 4 mm to 8 mm.

[0009] Further, the outer diameter of the first silicon steel sheet layer is 280 mm, the inner hole diameter is 80 mm, and the thickness is 33 mm. The outer diameter of the second silicon steel sheet layer is 270 mm, the inner hole diameter is 90 mm, and the thickness is 11 mm. The outer diameter of the third silicon steel sheet layer is 260 mm, the inner hole diameter is 100 mm, and the thickness is 6 mm. The outer diameter of the fourth silicon steel sheet layer is 250 mm, the inner hole diameter is 110 mm, and the thickness is 5 mm. The outer diameter of the fifth silicon steel sheet layer is 240 mm, the inner hole diameter is 120 mm, and the thickness is 4 mm. The outer diameter of the sixth silicon steel sheet layer is 220 mm, the inner hole diameter is 140 mm, and the thickness is 6 mm.

[0010] Further, the first silicon steel sheet layer is formed by stacking 138 silicon steel sheets with a thickness of 0.23 mm up and down. The second silicon steel sheet layer is formed by stacking 46 silicon steel sheets with a thickness of 0.23 mm up and down. The third silicon steel sheet layer is formed by stacking 25 silicon steel sheets with a thickness of 0.23 mm up and down. The fourth silicon steel sheet layer is formed by stacking 21 silicon steel sheets with a thickness of 0.23 mm up and down. The fifth silicon steel sheet layer is formed by stacking 17 silicon steel sheets with a thickness of 0.23 mm up and down. The sixth silicon steel sheet layer is formed by stacking 25 silicon steel sheets with a thickness of 0.23 mm up and down.

[0011] In addition, the present utility model also provides a single-phase power filter, which includes a main input switch QF1, a soft starter SS, and a transformer T1. The input end of the transformer T1 is connected to a phase wire and a neutral wire of the mains power supply, and the output end is connected to a load. The main input switch QF1 and the soft starter SS are sequentially arranged between the mains power supply and the input end of the transformer T1. The soft starter SS is only connected to the phase wire. The transformer T1 adopts the stacked cylindrical ring core structure as described above.

[0012] Furthermore, it further includes a dual-power conversion switch QF2. One normal-power input end of the dual-power conversion switch QF2 is connected to the output end of the transformer T1, and the other standby-power input end is connected to a phase wire and a neutral wire of the mains power supply, and the output end is connected to the load.

[0013] Furthermore, a first current transformer CT1 is arranged at the input end of the transformer T1, and a second current transformer CT2 is arranged at the output end of the transformer T1.

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

[0015] The stacked cylindrical ring core structure of the present utility model is formed by sequentially stacking multiple circular silicon steel sheet layers in a coaxial manner from top to bottom. The single-turn core is closed, and the magnetic lines of force form a closed-loop movement along the circular plane of each silicon steel sheet layer, eliminating the magnetic resistance and reducing the magnetic loss. Moreover, the outer diameter dimensions of the multiple silicon steel sheet layers gradually decrease from the middle position of the stack to both sides, and the inner hole diameter dimensions of the multiple silicon steel sheet layers gradually increase from the middle position of the stack to both sides. The distance difference between the vertex of the single-side cross-section of the multiple silicon steel sheet layers and the center point of the middlemost silicon steel sheet layer is within a preset range, making the overall shape of the stacked cylindrical ring core structure a stepped cylindrical ring. The cross-sectional shape of the coil wound on the stacked cylindrical ring core structure is circular, which makes the coil winding more convenient, shortens the length of each turn of the wound coil, reduces the internal resistance of the coil, improves the efficiency, reduces the temperature rise, and has the advantages of high efficiency, small volume, and light weight.

[0016] In addition, the single-phase filter of the present utility model also has the above-mentioned 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 for a further detailed description of the present utility model. 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 of the present utility model and their descriptions 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 1It is a schematic diagram of the three-dimensional structural principle of the stacked cylinder-shaped toroidal iron core structure of the preferred embodiment of the present application.

[0020] Figure 2 It is a schematic diagram of the top-view structural principle of the stacked cylinder-shaped toroidal iron core structure of the preferred embodiment of the present application.

[0021] Figure 3 is Figure 2 A schematic cross-sectional structure diagram taken along the A-A section.

[0022] Figure 4 It is a schematic diagram of the cross-sectional dimensions of the first silicon steel sheet layer of the preferred embodiment of the present application.

[0023] Figure 5 It is a schematic diagram of the cross-sectional dimensions of the second silicon steel sheet layer of the preferred embodiment of the present application.

[0024] Figure 6 It is a schematic diagram of the cross-sectional dimensions of the third silicon steel sheet layer of the preferred embodiment of the present application.

[0025] Figure 7 It is a schematic diagram of the cross-sectional dimensions of the fourth silicon steel sheet layer of the preferred embodiment of the present application.

[0026] Figure 8 It is a schematic diagram of the cross-sectional dimensions of the fifth silicon steel sheet layer of the preferred embodiment of the present application.

[0027] Figure 9 It is a schematic diagram of the cross-sectional dimensions of the sixth silicon steel sheet layer of the preferred embodiment of the present application.

[0028] Figure 10 It is a schematic diagram of the circuit principle of the single-phase power filter of another embodiment of the present application.

[0029] Explanation of reference numerals

[0030] 1. First silicon steel sheet layer; 2. Second silicon steel sheet layer; 3. Third silicon steel sheet layer; 4. Fourth silicon steel sheet layer; 5. Fifth silicon steel sheet layer; 6. Sixth silicon steel sheet layer. Detailed implementation manners

[0031] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] Refer to Figures 1 to 3As shown in the figure, a preferred embodiment of the present application provides a stacked cylindrical ring-shaped iron core structure, which includes a plurality of circular silicon steel sheet layers. The plurality of silicon steel sheet layers are stacked one above the other in sequence with a common central axis. The outer diameter dimensions of the plurality of silicon steel sheet layers gradually decrease from the middle position of the stack to both sides, and the inner hole diameter dimensions of the plurality of silicon steel sheet layers gradually increase from the middle position of the stack to both sides. The distance difference between the vertices of the unilateral cross-section of the plurality of silicon steel sheet layers and the center point of the middlemost silicon steel sheet layer is within a preset range. Herein, the distance difference refers to the absolute value of the difference in the distances between the two cross-section vertices and the center point. The preset range of the distance difference is 0 to 10 mm, which can be specifically set according to actual needs.

[0033] It can be understood that the stacked cylindrical ring-shaped iron core structure of this embodiment is formed by stacking a plurality of circular silicon steel sheet layers one above the other in sequence with a common central axis. The single-turn iron core is closed, and the magnetic lines of force form a closed-loop movement along the circular plane of each silicon steel sheet layer, eliminating magnetic resistance and reducing magnetic loss. Moreover, the outer diameter dimensions of the plurality of silicon steel sheet layers gradually decrease from the middle position of the stack to both sides, the inner hole diameter dimensions of the plurality of silicon steel sheet layers gradually increase from the middle position of the stack to both sides, and the distance difference between the vertices of the unilateral cross-section of the plurality of silicon steel sheet layers and the center point of the middlemost silicon steel sheet layer is within a preset range, making the overall shape of the stacked cylindrical ring-shaped iron core structure a stepped cylindrical ring. The winding cross-section shape of the coil wound around the stacked cylindrical ring-shaped iron core structure is circular, making the coil winding more convenient, shortening the length of each turn of the wound coil, reducing the internal resistance of the coil, improving the efficiency, reducing the temperature rise, and having the advantages of high efficiency, small volume, and light weight.

[0034] It can be understood that after using a plurality of silicon steel sheet layers to stack into a stacked cylindrical ring-shaped iron core structure, the iron core is wrapped and tied tightly with a yarn tape before the coil is wound. The coil is wound between the inner hole side and the outer circle side of the iron core in the height direction. Herein, the winding cross-section shape of the coil on the stacked cylindrical ring-shaped iron core structure is circular or approximately circular. Compared with the rectangular winding cross-section shape of the existing coil, it shortens the length of each turn of the coil, reduces the internal resistance of the coil, improves the efficiency, reduces the temperature rise, and makes the coil winding more convenient. Preferably, as Figure 3 shown by the dotted line in the figure, the winding cross-section shape of the coil on the stacked cylindrical ring-shaped iron core structure is circular, that is, the circumscribed contour shape of the vertices of the unilateral cross-section of the plurality of silicon steel sheet layers is circular. At this time, the winding length of each turn of the coil is the shortest.

[0035] Each silicon steel sheet layer is formed by stacking a plurality of silicon steel sheets one above the other with a common central axis. By using a plurality of thin silicon steel sheets to stack into a silicon steel sheet layer, it is beneficial to improve the performance of the iron core. Of course, in other embodiments, each silicon steel sheet layer can also use a thick single silicon steel sheet.

[0036] Specifically, the multiple silicon steel sheet layers include a first silicon steel sheet layer 1, a second silicon steel sheet layer 2, a third silicon steel sheet layer 3, a fourth silicon steel sheet layer 4, a fifth silicon steel sheet layer 5, and a sixth silicon steel sheet layer 6. The first silicon steel sheet layer 1 is located at the very middle position of the stack, and the second silicon steel sheet layer 2, the third silicon steel sheet layer 3, the fourth silicon steel sheet layer 4, the fifth silicon steel sheet layer 5, and the sixth silicon steel sheet layer 6 are stacked in sequence from the inside to the outside on both sides of the first silicon steel sheet layer 1. Among them, the outer diameter of the first silicon steel sheet layer 1 is 275 mm to 285 mm, the inner hole diameter is 75 mm to 85 mm, and the thickness is 30 mm to 35 mm; the outer diameter of the second silicon steel sheet layer 2 is 265 mm to 274 mm, the inner hole diameter is 86 mm to 95 mm, and the thickness is 8 mm to 13 mm; the outer diameter of the third silicon steel sheet layer 3 is 255 mm to 264 mm, the inner hole diameter is 96 mm to 105 mm, and the thickness is 4 mm to 8 mm; the outer diameter of the fourth silicon steel sheet layer 4 is 245 mm to 254 mm, the inner hole diameter is 106 mm to 115 mm, and the thickness is 4 mm to 7 mm; the outer diameter of the fifth silicon steel sheet layer 5 is 235 mm to 244 mm, the inner hole diameter is 116 mm to 124 mm, and the thickness is 3 mm to 6 mm; the outer diameter of the sixth silicon steel sheet layer 6 is 215 mm to 225 mm, the inner hole diameter is 135 mm to 144 mm, and the thickness is 4 mm to 8 mm.

[0037] Optionally, as Figure 2 , Figures 4 to 9 shown, the outer diameter of the first silicon steel sheet layer 1 is 280 mm, the inner hole diameter is 80 mm, and the thickness is 33 mm; the outer diameter of the second silicon steel sheet layer 2 is 270 mm, the inner hole diameter is 90 mm, and the thickness is 11 mm; the outer diameter of the third silicon steel sheet layer 3 is 260 mm, the inner hole diameter is 100 mm, and the thickness is 6 mm; the outer diameter of the fourth silicon steel sheet layer 4 is 250 mm, the inner hole diameter is 110 mm, and the thickness is 5 mm; the outer diameter of the fifth silicon steel sheet layer 5 is 240 mm, the inner hole diameter is 120 mm, and the thickness is 4 mm; the outer diameter of the sixth silicon steel sheet layer 6 is 220 mm, the inner hole diameter is 140 mm, and the thickness is 6 mm. Among them, the first silicon steel sheet layer 1 is stacked up and down by 138 silicon steel sheets with a thickness of 0.23 mm, the second silicon steel sheet layer 2 is stacked up and down by 46 silicon steel sheets with a thickness of 0.23 mm, the third silicon steel sheet layer 3 is stacked up and down by 25 silicon steel sheets with a thickness of 0.23 mm, the fourth silicon steel sheet layer 4 is stacked up and down by 21 silicon steel sheets with a thickness of 0.23 mm, the fifth silicon steel sheet layer 5 is stacked up and down by 17 silicon steel sheets with a thickness of 0.23 mm, and the sixth silicon steel sheet layer 6 is stacked up and down by 25 silicon steel sheets with a thickness of 0.23 mm. It can be understood that the surface of each silicon steel sheet is provided with an insulating coating to ensure the insulation between adjacent two silicon steel sheets.

[0038] In addition, as Figure 10 shown, the present utility model also provides a single-phase power filter, which includes a main input switch QF1, a soft starter SS and a transformer T1. The input end of the transformer T1 is connected to a phase wire and a neutral wire of the mains power supply, and the output end is connected to a load. The main input switch QF1 and the soft starter SS are sequentially arranged between the mains power supply and the input end of the transformer T1. The soft starter SS is only connected to the phase wire, and the transformer T1 adopts the stacked cylinder-shaped toroidal core structure as described above. Among them, the main input switch QF1 is used to control the on-off of the mains power input line, the soft starter SS is used to smoothly load the mains power onto the transformer T1 to prevent inrush current at the moment of power-on, and the transformer T1 is used to safely filter the single-phase power of the mains power supply, converting dangerous single-phase alternating current into safe single-phase alternating current. The ground current of this phase after conversion is less than the human body safety current value. The specific filtering principle belongs to the prior art and will not be elaborated here. Reference can be made to the patent CN208837572U previously applied by the applicant. In addition, the power filter can also be connected to the ground wire of the mains power supply, and the output end also includes a ground wire.

[0039] Optionally, the single-phase power filter further includes a dual-power conversion switch QF2. The dual-power conversion switch QF2 is electrically connected to a controller. One normal power input end of the dual-power conversion switch QF2 is connected to the output end of the transformer T1, another input end is connected to a phase wire and a neutral wire of the mains power supply, and the output end is connected to a load. When the single-phase power filter works normally, the dual-power conversion switch QF2 can be controlled by a controller (not shown in the figure) to switch to be connected to the output end of the transformer T1. At this time, filtered safe alternating current is output to the load for use; when the single-phase power filter fails, the dual-power conversion switch QF2 is controlled by the controller to switch to be connected to the mains power supply. At this time, the mains power supply provides emergency power supply to the load. In addition, the controller can also control the dual-power conversion switch QF2 to be suspended. At this time, no electric energy is output and the power supply to the load stops.

[0040] In addition, a first current transformer CT1 is arranged on the input end of the transformer T1, and a second current transformer CT2 is arranged on the output end, so as to monitor the input current and output current of the transformer T1. Both the first current transformer CT1 and the second current transformer CT2 are electrically connected to the controller. For example, when it is monitored that the output current of the transformer T1 is not within the specified range, the controller controls the dual-power conversion switch QF2 to switch to be connected to the mains power supply, and the mains power supply provides emergency power supply. In addition, a leakage current transformer LD1 is also arranged on the output end of the dual-power conversion switch QF2 for monitoring leakage current.

[0041] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A stacked cylindrical ring core structure, characterized in that: It comprises a plurality of circular silicon steel sheet layers, which are stacked up and down in sequence in a manner of sharing a common central axis, wherein the outer diameter of the plurality of silicon steel sheet layers gradually decreases from the middle position of the stack to both sides, and the inner hole diameter of the plurality of silicon steel sheet layers gradually increases from the middle position of the stack to both sides, and the distance difference between the vertices of the single-side cross-section of the plurality of silicon steel sheet layers and the center point of the middlemost silicon steel sheet layer is within a preset range.

2. The stacked cylindrical ring core structure according to claim 1, characterized in that: The cross-sectional shape of the coil wound on the stacked cylindrical ring core structure is circular.

3. The stacked cylindrical ring core structure according to claim 1, characterized in that: Each silicon steel sheet layer is formed by stacking multiple silicon steel sheets up and down with a common central axis.

4. The stacked cylindrical ring core structure according to claim 1, characterized in that: The plurality of silicon steel sheet layers comprise a first silicon steel sheet layer (1), a second silicon steel sheet layer (2), a third silicon steel sheet layer (3), a fourth silicon steel sheet layer (4), a fifth silicon steel sheet layer (5) and a sixth silicon steel sheet layer (6), wherein the first silicon steel sheet layer (1) is located in the middle of the stack, and the second silicon steel sheet layer (2), the third silicon steel sheet layer (3), the fourth silicon steel sheet layer (4), the fifth silicon steel sheet layer (5) and the sixth silicon steel sheet layer (6) are stacked in sequence from the inside to the outside on both sides of the first silicon steel sheet layer (1).

5. The stacked cylindrical ring core structure according to claim 4, characterized in that: The first silicon steel sheet layer (1) has an outer diameter of 275 mm to 285 mm, an inner diameter of 75 mm to 85 mm, and a thickness of 30 mm to 35 mm; the second silicon steel sheet layer (2) has an outer diameter of 265 mm to 274 mm, an inner diameter of 86 mm to 95 mm, and a thickness of 8 mm to 13 mm; the third silicon steel sheet layer (3) has an outer diameter of 255 mm to 264 mm, an inner diameter of 96 mm to 105 mm, and a thickness of 4 mm to 8 mm. The outer diameter of the fourth silicon steel sheet layer (4) is 245mm-254mm, the inner diameter is 106mm-115mm, and the thickness is 4mm-7mm. The outer diameter of the fifth silicon steel sheet layer (5) is 235mm-244mm, the inner diameter is 116mm-124mm, and the thickness is 3mm-6mm. The outer diameter of the sixth silicon steel sheet layer (6) is 215mm-225mm, the inner diameter is 135mm-144mm, and the thickness is 4mm-8mm.

6. The stacked cylindrical ring core structure according to claim 5, characterized in that: The first silicon steel sheet layer (1) has an outer diameter of 280 mm, an inner diameter of 80 mm, and a thickness of 33 mm; the second silicon steel sheet layer (2) has an outer diameter of 270 mm, an inner diameter of 90 mm, and a thickness of 11 mm; the third silicon steel sheet layer (3) has an outer diameter of 260 mm, an inner diameter of 100 mm, and a thickness of 6 mm; the fourth silicon steel sheet layer (4) has an outer diameter of 250 mm, an inner diameter of 110 mm, and a thickness of 5 mm; the fifth silicon steel sheet layer (5) has an outer diameter of 240 mm, an inner diameter of 120 mm, and a thickness of 4 mm; the sixth silicon steel sheet layer (6) has an outer diameter of 220 mm, an inner diameter of 140 mm, and a thickness of 6 mm.

7. The stacked cylindrical ring core structure according to claim 4, characterized in that: The first silicon steel sheet layer (1) is formed by stacking 138 silicon steel sheets with a thickness of 0.23 mm, the second silicon steel sheet layer (2) is formed by stacking 46 silicon steel sheets with a thickness of 0.23 mm, the third silicon steel sheet layer (3) is formed by stacking 25 silicon steel sheets with a thickness of 0.23 mm, the fourth silicon steel sheet layer (4) is formed by stacking 21 silicon steel sheets with a thickness of 0.23 mm, the fifth silicon steel sheet layer (5) is formed by stacking 17 silicon steel sheets with a thickness of 0.23 mm, and the sixth silicon steel sheet layer (6) is formed by stacking 25 silicon steel sheets with a thickness of 0.23 mm.

8. A single-phase electric energy filter, characterized in that: It includes a main input switch QF1, a soft starter SS and a transformer T1. The input end of the transformer T1 is connected to a phase line and a neutral line of the mains, and the output end is connected to the load via QF2. The main input switch QF1 and the soft starter SS are successively arranged between the mains and the input end of the transformer T1. The soft starter SS is only connected to the phase line. The transformer T1 adopts the stacked cylindrical ring core structure as described in any one of claims 1 to 7.

9. The single-phase electric energy filter according to claim 8, characterized in that: It also includes a dual power conversion switch QF2, one of the normal power input terminals of the dual power conversion switch QF2 is connected to the output terminal of the transformer T1, the other input terminal is connected to a phase line and a neutral line of the mains, and the output terminal is connected to the load.

10. The single-phase electric energy filter according to claim 8, characterized in that: A first current transformer CT1 is provided at the input end of the transformer T1, and a second current transformer CT2 is provided at the output end.

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