Filter transformer for suppressing harmonic eddy-current loss noise

Abstract

The utility model discloses a filter transformer for suppressing harmonic eddy current loss noise, which is characterized in that a core-wrapped column is arranged between an upper yoke and a lower yoke, the upper yoke and the lower yoke both comprise a plurality of silicon steel sheets, the plurality of silicon steel sheets of the upper yoke are transversely and vertically stacked and arranged front and back, the silicon steel sheets of the upper yoke are divided into two sheets, and the two sheets are arranged in parallel; the upper end of the upper iron yoke and the lower end of the lower iron yoke are provided with an upper pressing beam and a lower pressing beam respectively, and the steel silicon steel sheet further comprises a tensioning piece. The upper end and the lower end of the tensioning piece are installed on the upper pressing beam and the lower pressing beam in a penetrating mode respectively so that the upper end face and the lower end face of the iron core column can be tightly attached to the end face of the upper iron yoke and the end face of the lower iron yoke respectively, and the problems of mechanical noise caused by inter-sheet high-frequency electrodynamic force attraction caused by higher harmonics, eddy current heating caused by large faces of silicon steel sheets and the like are solved. The utility model has the technical characteristics of low temperature rise, low noise, low loss, economy, safety, reliability and the like.

Description

Technical Field

[0001] The utility model relates to a transformer, more specifically, to a filter transformer capable of suppressing harmonic eddy current loss noise, and belongs to the technical field of transformers. Background Art

[0002] A three-phase transformer is a combination of three single-phase transformers of equal capacity, each with three independent windings. They are connected to a three-phase AC power supply via various connections (such as star or delta), and their output is similar. It operates primarily based on the principle of electromagnetic induction: when AC current flows through the primary coil, an AC magnetic flux is generated in the iron or magnetic core. This alternating magnetic flux passes through the secondary winding, inducing a voltage or current there. When the secondary winding is connected to an external load, AC current flows, generating electrical energy. A three-phase transformer primarily consists of an iron core, windings, an oil tank, an oil pillow, insulating bushings, a tap changer, and a gas relay. The iron core is the magnetic circuit portion of the transformer and is constructed from high-quality silicon steel sheets with a thickness of 0.3-0.35 mm or less to reduce hysteresis and eddy current losses. The iron core consists of a core leg, on which the windings are placed, and upper and lower yokes connect the core legs to form a closed magnetic circuit. The windings are the electrical circuit portion of the transformer and are divided into high-voltage and low-voltage windings. There are two types of windings: concentric and overlapping. In the concentric winding, both the high-voltage winding and the low-voltage winding are made into cylindrical shapes, and then coaxially sleeved on the iron core column; in the overlapping winding, both the high-voltage winding and the low-voltage winding are divided into several coils, which are staggered along the height of the iron core column.

[0003] The advantages of three-phase transformers include their ability to transform voltage and transmit current; high efficiency and stability; and the ability to be carefully designed and manufactured to meet user requirements. By establishing a new neutral ground, they can eliminate common-mode interference and other neutral line issues within the power grid. They can also convert three-wire delta connections into a four-wire Y0 system, further eliminating high-frequency pulse interference and noise coupled within the transformer. They are suitable for circuits operating at AC frequencies of 50Hz to 60Hz and voltages up to 660V. They are widely used in imported critical equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectifiers, and lighting.

[0004] However, the three-phase transformer in the prior art has the following technical defects: 1) After the upper yoke, lower yoke and core column in the transformer are assembled into a platform, the yoke and core column are compressed by upper and lower pressure beams through tie rods. The structure is loose, and each phase core column is made separately, making it difficult to achieve that the three core columns are completely equal in height. When assembled into a platform, the three core columns are lined up on the smooth upper surface of the lower yoke, and the three core columns are placed on the lower yoke. Then the upper yoke is installed, and the upper and lower yokes and core columns are compressed by tie rods. Because the upper and lower yokes are structurally stable and not easily deformed, the three core columns cannot be completely equal in height (the basic principle is that three points cannot form a straight line). Even if the three core columns are processed with high precision, it is very easy for the three core columns to not be installed at the same height during actual installation. Therefore, the transformer will eventually suffer from inconsistent pressing force of the three core columns when assembled into a platform, and the core is very likely to vibrate due to electromagnetic interference, causing huge noise.

[0005] 2) It is impossible to accurately position the core column at the corresponding fixed position of the upper and lower iron yokes, and the stability of the entire core cannot be ensured. Mechanical noise is easily caused by assembly errors, and the product structure is poor, loose, and difficult to operate;

[0006] 3) If Figure 12 The figure shows the laminated core leg in the magnetic induction zone of a conventional transformer. To overcome the electrodynamic pull and prevent mechanical vibration and noise, a core-curing adhesive is applied to the entire core leg. Glass ribbon or fiberglass tape is then tied to the cured core leg. This structure works adequately for AC fundamental waves. However, when encountering higher-order spectral waves, the radial magnetic flux of the leakage field propagates through the large surface of the silicon steel laminations, causing eddy current heating (at the cross-section). This rapidly increases the core temperature, and the core-curing adhesive loses its ability to maintain stability. The glass ribbon and fiberglass tape, however, only act as a limiter, lacking any clamping force, and are therefore unable to control the electrodynamic pull between the silicon steel laminations within the core leg. High-order harmonics increase the pull-in frequency dramatically, causing the high-frequency electrodynamic pull between the laminations to generate increasingly loud mechanical noise, ultimately leading to complete loosening of the core leg and a short circuit between the conductors, destroying the transformer. Utility Model Content

[0007] In order to solve the above-mentioned problems in the prior art, the utility model provides a filter transformer that suppresses harmonic eddy current loss noise with technical characteristics such as low temperature rise, low noise, low loss, economy, safety and reliability.

[0008] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0009] The utility model discloses a filter transformer for suppressing harmonic eddy current loss noise, comprising a coil, insulation, a body, an oil tank and three iron core columns arranged at equal intervals, wherein the iron core column is installed between an upper iron yoke and a lower iron yoke, and the upper iron yoke and the lower iron yoke each include a plurality of silicon steel sheets, and the silicon steel sheets are fitted and pressed into blocks by fasteners, the plurality of silicon steel sheets of the upper iron yoke are arranged horizontally and vertically and stacked front to back, the silicon steel sheets of the upper iron yoke are divided into two pieces, and the dividing lines on adjacent silicon steel sheets are staggered to achieve cross-staggered clamping and clamping between the stacked silicon steel sheets, an upper pressure beam and a lower pressure beam are respectively installed at the upper end of the upper iron yoke and the lower end of the lower iron yoke, and also includes a tensioning member, the upper and lower ends of the tensioning member are respectively passed through and installed on the upper pressure beam and the lower pressure beam to achieve the upper and lower end faces of the iron core column being fitted tightly against the end faces of the upper iron yoke and the lower iron yoke respectively.

[0010] Preferably, the dividing lines on adjacent silicon steel sheets are respectively located on the left and right sides of the center lines of the two silicon steel sheets, and the two dividing lines are spaced 10 mm apart.

[0011] Preferably, three equally spaced mounting grooves are respectively provided on the lower end surface of the upper iron yoke and the upper end surface of the lower iron yoke, and the middle mounting groove is located at the center line of the upper iron yoke. The mounting grooves are formed by cutting silicon steel sheets, wherein the width of the mounting grooves (silicon steel sheet cutting openings) located at the center is greater than the spacing between adjacent dividing lines, and the mounting grooves on the upper iron yoke and the mounting grooves on the lower iron yoke are arranged one by one above and below, and boss tenons are embedded in the mounting grooves, and each of the core columns is restricted and positioned by the corresponding boss tenons above and below.

[0012] Preferably, the boss tenon is formed by stacking a plurality of silicon steel sheets, and the boss tenon protrudes from the end surfaces of the upper iron yoke and the lower iron yoke.

[0013] Preferably, the size of the boss tenon is compatible with the size of the mounting groove.

[0014] Preferably, process holes are opened at the upper and lower ends of the core column, the size of the process holes is adapted to the size of the boss tenon, and the boss tenons on the upper iron yoke and the lower iron yoke can be inserted into the process holes to restrict and position the core column.

[0015] Preferably, the fasteners include four channel steels and multiple bolts, two of which are used to clamp the silicon steel sheets on the upper iron yoke front and back and are fixed by passing bolts and nuts, and the other two channel steels are used to clamp the silicon steel sheets on the lower iron yoke front and back and are fixed by passing bolts and nuts.

[0016] Preferably, the tensioning member comprises a pull rod, and the upper and lower ends of the pull rod are respectively passed through the channel steels located at the upper and lower ends and are locked and fixed by nuts.

[0017] Preferably, there are two upper pressure beams and two lower pressure beams, the two upper pressure beams are longitudinally spaced apart and arranged on the upper end surface of the upper iron yoke, and the two lower pressure beams are longitudinally spaced apart and arranged on the lower end surface of the lower iron yoke; the two upper pressure beams are respectively located in the middle of adjacent iron core columns, and the upper pressure beams and the lower pressure beams are arranged in one-to-one correspondence, and the front end of the upper pressure beam and the front end of the lower pressure beam, as well as the rear end of the upper pressure beam and the rear end of the lower pressure beam are respectively locked and fixed by tensioning pieces.

[0018] Preferably, a plurality of silicon steel laminations are stacked around the core column, and the plurality of silicon steel laminations form a circular column structure, so that the lamination direction of the core column is parallel to the derivation direction of the magnetic excitation line, thereby achieving a transverse electromotive force without high-order harmonic AC between the silicon steel laminations of the core column.

[0019] Beneficial effects: low temperature rise, low noise, low loss, economic, safe and reliable; by cutting the silicon steel sheet on the iron yoke with a 10mm cross-stagger in the center line of the length direction, and then stacking them into a whole iron yoke, the eddy current loss of the single silicon steel sheet is reduced by 1%. Even if three core columns of unequal height are placed on the broken yoke, the upper iron yoke is installed, and the pull rod is tightened, the upper iron yoke can also be slightly deformed due to the height difference of the three columns. Through this slight deformation, the three core columns of unequal height are tightly fitted with the upper and lower iron yokes, so that the three columns are The equal forces ensure the tightness of the entire core structure, solve the technical problem that the three points cannot be in a straight line, and thus reduce the vibration of the core caused by electromagnetic radiation; using the process hole in the middle of the radiating core column, three boss tenons corresponding to the process holes of the core column are stacked with silicon steel sheets at the corresponding positions of the upper and lower iron yokes. When assembling the core column, as long as the process holes of the core column are aligned with the boss tenons, the spacing between the three columns and the iron yoke are accurately assembled. The structure of the entire product is stable, strict and easy to operate; the lamination direction of the entire core column is consistent with the direction of the magnetic excitation line (such as Figure 10 The iron core column is parallel to the direction of the arrow in the middle, so that there is no high-order harmonic AC horizontal attraction electromotive force between the plates, which solves the mechanical noise caused by the high-frequency electromotive force attraction between the plates caused by high-order harmonics. Compared with the existing technical basis, the technology of the utility model has a stable and solid overall structure, and the process makes its operation simple and the installation precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the transformer of the utility model.

[0021] Figure 2 It is a top view of the overall structure of the transformer of the utility model.

[0022] Figure 3 It is a schematic diagram of the connection between the iron core column and the iron yoke of the utility model.

[0023] Figure 4 It is a side view of the connection between the iron core column and the iron yoke of the utility model.

[0024] Figure 5 This is a top view of the lower iron yoke of the utility model.

[0025] Figure 6 It is an enlarged view of point A of the present utility model.

[0026] Figure 7 This is a schematic diagram of the arrangement of some silicon steel sheets at the installation groove of the utility model.

[0027] Figure 8 It is a top view of the connection between the lower iron yoke and the iron core column of the utility model.

[0028] Figure 9 This is the main view of the connection between the lower iron yoke and the iron core column of the utility model.

[0029] Figure 10 It is a schematic diagram of the connection between the lower iron yoke and the boss tenon of the utility model.

[0030] Figure 11 This is a diagram showing the lamination method of the iron core column of the utility model and the direction of the magnetic lines of force of the magnetically derived leakage magnetic field.

[0031] Figure 12 It is a diagram showing the direction of magnetic lines of force of the core column lamination method and the leakage magnetic field in the existing technology. DETAILED DESCRIPTION

[0032] The following is in conjunction with the instructions Figure 1-12 , the utility model is further described below, but the utility model is not limited to the following embodiments.

[0033] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", "horizontal", "longitudinal", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0034] The primary feature of the filter transformer designed in this application is its ability to operate safely and reliably in high-harmonic environments. This is particularly true under the influence of high-harmonics generated by current offshore wind power, solar power generation, hydrogen energy, and associated energy storage. This allows the transformer to maintain low temperature rise, low losses, and low noise, ensuring long-term, economical, safe, and reliable operation.

[0035] like Figure 1-11The figure shows a specific embodiment of a filter transformer for suppressing harmonic eddy current loss noise. A filter transformer for suppressing harmonic eddy current loss noise includes a coil, an insulation, a body, an oil tank, and three equally spaced iron core columns 8. The iron core columns 8 are installed between an upper iron yoke 1 and a lower iron yoke 2. The upper iron yoke 1 and the lower iron yoke 2 each include a plurality of silicon steel sheets 3 and the silicon steel sheets 3 are pressed together into a block by fasteners. The plurality of silicon steel sheets 3 of the upper iron yoke 1 are all horizontally vertical and the front and back are stacked. The silicon steel sheets 3 of the upper iron yoke 1 are divided into two pieces, and the dividing lines 4 on adjacent silicon steel sheets 3 are staggered to achieve cross-staggered clamping and clamping between the stacked silicon steel sheets 3. The upper end of the upper iron yoke 1 and the lower end of the lower iron yoke 2 are respectively installed with an upper pressure beam 5 and a lower pressure beam 6, and also include a tensioning member 7. The upper and lower ends of the tensioning member 7 are respectively installed on the upper pressure beam 5 and the lower pressure beam 6 to achieve the upper and lower end faces of the core column 8 being respectively tightly attached to the end faces of the upper iron yoke 1 and the lower iron yoke 2.

[0036] Existing technologies (such as "Transformer Radiant Core Columns") have disclosed that the core columns are composed of upper and lower iron yokes and core columns, respectively. After being assembled into a table, the iron yokes and the core columns are compressed by upper and lower pressure beams through pull rods. Therefore, its structure is loose, and each phase of the core column is made separately, making it difficult to achieve completely equal heights for the three core columns. When assembled into a table, although the three core columns are lined up on the smooth surface of the lower iron yoke, the upper and lower iron yokes are structurally stable and not easily deformed, so the three core columns cannot achieve completely equal heights (the design focus of this application is: the contact points of the three core columns with the upper iron yoke are regarded as three points. Since the upper iron yoke is hard and not easily deformed, when the three core columns are pulled, it is impossible to achieve the same force and consistent fit between the three core columns and the upper iron yoke and the three core columns and the lower iron yoke. The principle is: the basic principle that three points cannot form a straight line). Even if the processing precision of the three core columns is very high, it is very easy to encounter the problem that the three core columns cannot be installed at the same height during actual installation. Therefore, the transformer will inevitably fail to meet the same pressure when the three core legs are assembled, causing the core to vibrate due to electromagnetic interference, resulting in loud noise. This problem cannot be solved at present, and can only be repaired through regular inspection or replacement.

[0037] In response to the above technical problems, the utility model solves the "technical problem that three points cannot form a straight line" in the transformer. Its creativity lies in: the silicon steel sheets 3 of the upper iron yoke 2, which are vertical and stacked front to back, are cut at the center line in the longitudinal direction and formed into a cross-staggered spacing of 10 mm, and then the cross-staggered sheets are stacked to form a whole upper iron yoke 2 (Note: the silicon steel sheets 3 are cut longitudinally along the length direction to achieve a 1% reduction in the eddy current loss of a single silicon steel sheet 3), solving the "technical problem that three points cannot form a straight line" in the transformer.

[0038] The silicon steel sheet creatively designed in this application is called a broken yoke (this design point has significant substance and is a freely defined name).

[0039] Operation method / principle: For example, if three core columns 8 of different heights are placed on the lower iron yoke 2, and then the upper iron yoke 1 is installed, and the tension rod 13 (i.e., tension member 7) is tightened at the same time, since the silicon steel sheets 3 on the upper iron yoke 1 are vertical and stacked front to back, they are cross-staggered stacked front to back. Therefore, even if the upper iron yoke 1 is pressed into a block, the silicon steel sheets 3 on the upper iron yoke 1 have a certain deformation in the vertical direction. Pull rods 13 are set between the left core column 8 and the middle core column 8, and between the middle core column 8 and the right core column 8. At the same time, the pull rods 13 on the left and right sides are tightened. During the tightening process, the silicon steel sheets 3 on the upper iron yoke 1 in the middle can be deformed downward, so that the upper ends of the core columns 8 on the right, middle, and left sides are subjected to uniform force and have consistent fit. Therefore, it is precisely because the upper iron yoke 1 will form a slight deformation due to the height difference of the three columns that this slight deformation allows the three core columns 8 of unequal height to fit tightly with the upper and lower iron yokes, so that the three core columns 8 are subjected to equal force, ensuring the tightness of the entire core structure, solving the technical problem that the three points cannot be in a straight line, and thus reducing the vibration of the core caused by electromagnetic radiation. This design point seems simple, but it actually breaks the technical understanding of traditional iron yokes by those skilled in the art. It takes into account the required hardness and stability, and also achieves slight deformation (the overall structure is clamped by the offset and external fasteners, so it is only slightly deformed, and the technical solution of this application only requires slight deformation). The utility model provides a broader space for the development and use of transformers.

[0040] In a preferred embodiment, the dividing lines 4 on adjacent silicon steel sheets 3 are respectively located on the left and right sides of the center lines of the two silicon steel sheets 3, and the two dividing lines 4 are spaced 10 mm apart. The cutting spacing is a preferred size and can be adjusted according to actual needs. This application does not impose any specific restrictions.

[0041] In a preferred embodiment, three equally spaced mounting grooves 9 are respectively provided on the lower end surface of the upper iron yoke 1 and the upper end surface of the lower iron yoke 2, and the middle mounting groove 9 is located at the center line of the upper iron yoke 1. Figure 7As shown, the present application preferably adopts a non-through mounting groove 9 (i.e., the depth dimension of the mounting groove is not as large as the width dimension of the silicon steel sheet), and the mounting groove is formed by cutting the silicon steel sheet 3, wherein the width of the cutting opening of the mounting groove 9 located at the center is greater than the spacing between the adjacent dividing lines 4 (so that the cutting opening forming the mounting groove 9 covers part of the dividing lines 4 on the silicon steel sheet 3). Since the mounting groove 9 is also formed by cutting a number of silicon steel sheets 3, the dividing lines 4 located at the top of some silicon steel sheets 3 will be covered by the cutting opening forming the mounting groove 9, while the dividing lines 4 on the silicon steel sheet 3 located at the bottom of the mounting groove 9 are still staggered. The design scheme of the present application has a compact structural design, high integration, and novel design scheme, and can accurately achieve technical effects. Specifically: the mounting groove 9 on the upper iron yoke 1 is arranged one by one with the mounting groove 9 on the lower iron yoke 2, and a boss tenon 10 is embedded in the mounting groove 9. Each of the core columns 8 is restricted and positioned by the boss tenon 10 corresponding to the upper and lower bosses.

[0042] In a preferred embodiment, the boss tenon 10 is formed by stacking a number of silicon steel sheets 3, and the boss tenon 10 protrudes from the end faces of the upper iron yoke 1 and the lower iron yoke 2. The size of the boss tenon 10 is compatible with the size of the mounting slot 9. Process holes are provided at the upper and lower ends of the core column 8, and the size of the process hole is compatible with the size of the boss tenon 10. The boss tenons 10 on the upper iron yoke 1 and the lower iron yoke 2 can be inserted into the process holes to limit the positioning of the core column 8. The above design allows the boss tenons 10 to fit tightly with the boss tenons 10, facilitating precise assembly and ensuring that the core column 8 does not shift. When assembling the core column 8, it is sufficient to align the process hole of the core column 8 with the boss tenon 10, ensuring that the spacing between the three columns and the iron yoke are precisely assembled. The entire product structure is stable, solid, and easy to operate.

[0043] In a preferred embodiment, the fasteners include four channel steels 12 and a plurality of bolts, two of which are used to clamp the silicon steel sheets 3 on the upper iron yoke 1 front and back and are secured by bolts and nuts, and the other two channel steels 12 are used to clamp the silicon steel sheets 3 on the lower iron yoke 2 front and back and are secured by bolts and nuts. The tensioning member 7 includes a pull rod 13, the upper and lower ends of which are respectively passed through the channel steels 12 at the upper and lower ends and secured by nuts. The upper pressure beams 5 and the lower pressure beams 6 are each provided with two, the two upper pressure beams 5 being longitudinally spaced apart on the upper end surface of the upper iron yoke 1, and the two lower pressure beams 6 being longitudinally spaced apart on the lower end surface of the lower iron yoke 2; the two upper pressure beams 5 are respectively located between adjacent core columns 8, and the upper pressure beams 5 and the lower pressure beams 6 are arranged one-to-one, and the front ends of the upper pressure beams 5 and the front ends of the lower pressure beams 6 and the rear ends of the upper pressure beams 5 and the rear ends of the lower pressure beams 6 are respectively secured by the tensioning member 7. The structure is simple, the installation is convenient, the practicability is strong, and it is suitable for the assembly operation based on the current technology.

[0044] In a preferred embodiment, a plurality of silicon steel laminations 14 are stacked around the core column 8, and the plurality of silicon steel laminations 14 form a circular column structure, so that the lamination direction of the core column 8 is parallel to the derivation direction of the magnetic excitation line, thereby achieving a transverse electromotive force without high-order harmonic AC between the silicon steel laminations 14 of the core column 8.

[0045] like Figure 12 The figure shows the laminated core column in the magnetic induction area of ​​the traditional transformer. In order to overcome the electric attraction force and prevent the vibration and mechanical noise from occurring here, the core curing glue is used to cure the entire core column ( Figure 12 (The silicon steel sheets, which gradually increase in length from the left and right ends toward the center, are coated with curing adhesive throughout. After curing, glass ribbons or fiberglass tape are then tied to the core legs. This structure is barely usable for AC fundamental waves. However, when encountering higher-order spectral waves, the radial magnetic derivative magnetic lines of force (direction of the arrow) of the leakage field penetrate the large surface of the silicon steel sheets, causing eddy current heating (at the cross-section). The core temperature rises sharply, and the core curing adhesive loses its overall curing effect. The glass ribbons and fiberglass tapes only serve as limiters and lack clamping force, making it impossible to control the electrodynamic attraction between the silicon steel sheets within the core legs. High-order harmonics increase the frequency of attraction, causing the high-frequency electrodynamic attraction between the core legs to generate increasing mechanical noise, eventually leading to complete loosening of the core legs, and eventually short-circuiting the conductors and burning out the transformer.

[0046] However, the present application makes the lamination direction of the transformer magnetic induction zone iron core column parallel to the direction of the magnetic field lines of the magnetic derivative of the leakage magnetic field (such as Figure 11 As shown), the magnetic derivative magnetic lines of force of the core column in the magnetic induction area can only enter and exit from the thickness direction of the silicon steel sheet 3 (generally about 0.3 mm), and the eddy current ring of the magnetic lines of force is limited to the thickness of the silicon steel sheet 3, completely eliminating the opportunity for the magnetic lines of force derived from the radial leakage magnetic field in the magnetic induction area to pass through the large surface of the silicon steel sheet 3, so that no hot spots are generated in the radiating core column in the magnetic induction area, so that the transformer is not affected by high-order harmonics, ensuring that the filter transformer designed in this application can operate in a high-order harmonic environment with low temperature rise, low loss, environmental protection, economy, reliability and safety.

[0047] Finally, it should be noted that the present invention is not limited to the above embodiments and may be subject to many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered to be within the scope of protection of the present invention.

Claims

1. A filter transformer for suppressing harmonic eddy current loss noise, comprising a coil, insulation, a body, an oil tank, and three equally spaced iron core columns (8), wherein the iron core columns (8) are installed between an upper iron yoke (1) and a lower iron yoke (2), wherein the upper iron yoke (1) and the lower iron yoke (2) each comprise a plurality of silicon steel sheets (3), and the silicon steel sheets (3) are pressed together into a block by fasteners, and characterized in that: The plurality of silicon steel sheets (3) of the upper iron yoke (1) are arranged in a horizontal and vertical manner and stacked front to back. The silicon steel sheets (3) of the upper iron yoke (1) are divided into two sheets, and the dividing lines (4) on adjacent silicon steel sheets (3) are staggered to achieve cross-staggered clamping and fastening between the stacked silicon steel sheets (3). An upper pressure beam (5) and a lower pressure beam (6) are respectively installed at the upper end of the upper iron yoke (1) and the lower end of the lower iron yoke (2), and a tensioning member (7) is also included. The upper and lower ends of the tensioning member (7) are respectively passed through and installed on the upper pressure beam (5) and the lower pressure beam (6) to achieve the upper and lower end faces of the core column (8) being respectively pressed against the end faces of the upper iron yoke (1) and the lower iron yoke (2).

2. The filter transformer for suppressing harmonic eddy current loss noise according to claim 1, characterized in that: The dividing lines (4) on adjacent silicon steel sheets (3) are respectively located on the left and right sides of the center lines of the two silicon steel sheets (3), and the two dividing lines (4) are spaced 10 mm apart.

3. A filter transformer for suppressing harmonic eddy current loss noise according to claim 1 or 2, characterized in that: Three equally spaced mounting grooves (9) are respectively provided on the lower end surface of the upper iron yoke (1) and the upper end surface of the lower iron yoke (2), wherein the middle mounting groove (9) is located at the center line of the upper iron yoke (1), wherein the width of the mounting groove (9) located at the center is greater than the spacing between adjacent dividing lines (4), the mounting groove (9) on the upper iron yoke (1) and the mounting groove (9) on the lower iron yoke (2) are arranged one by one, and a boss tenon (10) is embedded in the mounting groove (9), and each of the core columns (8) is restricted and positioned by the boss tenon (10) corresponding to the upper and lower boss tenons.

4. The filter transformer for suppressing harmonic eddy current loss noise according to claim 3, characterized in that: The boss tenon (10) is formed by stacking a plurality of silicon steel sheets (3).

5. The filter transformer for suppressing harmonic eddy current loss noise according to claim 4, characterized in that: The size of the boss tenon (10) is compatible with the size of the mounting groove (9).

6. The filter transformer for suppressing harmonic eddy current loss noise according to claim 3, characterized in that: The upper and lower ends of the core column (8) are provided with process holes, the size of the process holes being compatible with the size of the boss tenon (10), and the boss tenon (10) on the upper iron yoke (1) and the lower iron yoke (2) can be inserted into the process holes to restrict and position the core column (8).

7. The filter transformer for suppressing harmonic eddy current loss noise according to claim 1, characterized in that: The fasteners include four channel steels (12) and a plurality of bolts, wherein two channel steels (12) are used to be clamped front and back on the silicon steel sheets (3) on the upper iron yoke (1) and are locked and fixed by passing bolts and nuts, and the other two channel steels (12) are used to be clamped front and back on the silicon steel sheets (3) on the lower iron yoke (2) and are locked and fixed by passing bolts and nuts.

8. The filter transformer for suppressing harmonic eddy current loss noise according to claim 7, characterized in that: The tensioning member (7) includes a pull rod (13), and the upper and lower ends of the pull rod (13) are respectively passed through the channel steel (12) located at the upper and lower ends and are locked and fixed by nuts.

9. The filter transformer for suppressing harmonic eddy current loss noise according to claim 8, characterized in that: There are two upper pressure beams (5) and two lower pressure beams (6), and the two upper pressure beams (5) are longitudinally spaced apart and arranged on the upper end surface of the upper iron yoke (1), and the two lower pressure beams (6) are longitudinally spaced apart and arranged on the lower end surface of the lower iron yoke (2); the two upper pressure beams (5) are respectively located in the middle of adjacent iron core columns (8), and the upper pressure beams (5) and the lower pressure beams (6) are arranged in a one-to-one correspondence, and the front end of the upper pressure beam (5) and the front end of the lower pressure beam (6) and the rear end of the upper pressure beam (5) and the rear end of the lower pressure beam (6) are respectively locked and fixed by tensioning members (7).

10. The filter transformer for suppressing harmonic eddy current loss noise according to claim 1, characterized in that: A plurality of silicon steel laminations (14) are stacked around the core column (8), and the plurality of silicon steel laminations (14) form a circular column structure, so that the lamination direction of the core column (8) is parallel to the direction of derivation of the magnetic excitation line, thereby achieving no high-order harmonic alternating current transverse attraction electromotive force between the silicon steel laminations (14) of the core column (8).

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