Transformer core structure and transformer

Abstract

This utility model discloses a transformer core structure and a transformer, relating to the field of transformer technology. The transformer core structure includes a core, a tie plate assembly, and a clamping assembly. The core includes a core column and yokes spliced ​​at both ends of the core column. The tie plate assembly includes non-magnetic steel plates, with two non-magnetic steel plates corresponding to each core column. Each non-magnetic steel plate includes a clamping part and connecting parts at both ends of the clamping part. The clamping part clamps the core column along the lamination direction. The clamping assembly includes a tensioning member and two web plates. The two web plates are clamped to the yoke along a first direction, and the tensioning member provides tension to the two web plates. A splicing seam is formed between the core column and the yoke. The connecting parts cover the splicing seam, and the side of the connecting parts away from the splicing seam is in contact with the web plates. The clamping part has multiple elongated holes, which are arrayed along the width direction of the non-magnetic steel plates. This solution has the advantages of reducing heat accumulation in the tie plate assembly and reducing eddy current losses near the tie plate assembly.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a transformer core structure and a transformer. Background Technology

[0002] The core is one of the core components of a transformer. Typically, the core column needs to be secured with tie plates, while the yoke needs to be secured with web plates. The tie plates are usually bound to the core column with straps to clamp it. However, during transformer operation, magnetic leakage occurs at the core column. Magnetic lines of force pass through the tie plates, causing magnetic circuit distortion and resulting in eddy current losses at the tie plate location, which in turn leads to localized overheating. Utility Model Content

[0003] The main purpose of this utility model is to propose a transformer core structure and a transformer, which aims to solve the problem of local hot spots near the transformer core tie plate.

[0004] To achieve the above objectives, this utility model proposes a transformer core structure, comprising:

[0005] The iron core includes a core column and iron yokes spliced ​​to both ends of the core column;

[0006] A plate assembly includes non-magnetic steel plates. Each core column is provided with two non-magnetic steel plates. Each non-magnetic steel plate includes a clamping part and a connecting part provided at both ends of the clamping part. The stacking direction of the core column is denoted as the first direction. The clamping part clamps the core column along the first direction.

[0007] The clamping assembly includes a tensioner and two webs, the two webs being clamped to the yoke along the first direction, the tensioner being used to provide a tensile force to the two webs;

[0008] A splicing seam is formed between the core column and the yoke. The connecting part covers the splicing seam, and the side of the connecting part away from the splicing seam is in contact with the web. The clamping part has multiple elongated holes, which are arranged in an array along the width direction of the non-magnetic steel plate.

[0009] In one embodiment, the connecting portion has a plurality of threaded holes, the web plate has a countersunk hole corresponding to the threaded holes, the pull plate assembly further includes a screw, the countersunk hole and the threaded hole are connected by the screw, and the side of the screw away from the yoke is located on the same plane as the side of the web plate away from the yoke.

[0010] In one embodiment, the connecting portion has a limiting hole, the pull plate assembly further includes a limiting shaft, the web has a mounting through hole, the limiting shaft is fixedly installed in the mounting through hole, and the limiting shaft passes through the limiting hole, the side of the limiting shaft away from the yoke and the side of the web away from the yoke are located on the same plane.

[0011] In one embodiment, the connecting portion has a limiting hole, the pull plate assembly further includes a limiting shaft, the web plate has a blind hole on the side facing the yoke, the limiting shaft is fixedly installed in the blind hole, and the limiting shaft passes through the limiting hole.

[0012] In one embodiment, the pull plate assembly further includes a first insulating member, which is installed between the non-magnetic steel plate and the iron core. The first insulating member includes a first insulating plate and a plurality of inclined pads, which are installed on the first insulating plate and are fitted to the clamping portion.

[0013] Let the direction from one of the iron yokes to another iron yoke be the second direction, and let the length direction of the inclined pad block make an angle α with the second direction. Then, α satisfies: α∈(0°, 90°);

[0014] The plurality of inclined pads are arranged parallel to each other along the second direction.

[0015] In one embodiment, the first insulating member further includes a plurality of crimping pads, the length direction of which is parallel to the second direction, and the plurality of crimping pads are installed parallel to each other on the first insulating plate, and the crimping pads are fitted to the connecting portion.

[0016] In one embodiment, the clamping assembly further includes a second insulating member, which is mounted between the web and the yoke;

[0017] The second insulating component includes a second insulating plate and a plurality of main pads, the length direction of which is parallel to the second direction, and the plurality of main pads are installed on the second insulating plate in parallel at intervals.

[0018] In one embodiment, the second insulating member further includes auxiliary pads, and the auxiliary pads are installed at both ends of the second insulating plate. The auxiliary pads include a main body and an extension. The opposite sides of the main body are respectively attached to the second insulating plate and the web plate. The extension extends along the second direction and is attached to the core column to clamp the core column.

[0019] In one embodiment, the core column includes multiple sets of silicon steel sheets arranged in layers. Each set of silicon steel sheets includes a first sheet, a second sheet, a third sheet, a fourth sheet, and a fifth sheet stacked in a transverse step. Each of the first to the fifth sheets is formed by splicing two sub-sheets together.

[0020] Along a direction perpendicular to the first piece, the splicing lines of the first piece, the second piece, and the third piece coincide, the splicing lines of the fourth piece and the fifth piece coincide, and the splicing lines from the first piece to the third piece and from the fourth piece to the fifth piece are staggered.

[0021] A transformer includes a transformer core structure as described in any of the above embodiments, the transformer further includes a coil winding and a housing, the coil winding is wound around the core column, the housing has an accommodating cavity, and the transformer core structure and the coil winding are both installed in the accommodating cavity.

[0022] According to the technical solution provided by this utility model, the transformer core structure includes a core, a pull plate assembly, and a clamping assembly. The core includes a core column and yokes spliced ​​at both ends of the core column. The pull plate assembly includes non-magnetic steel plates, and two non-magnetic steel plates are provided for each core column. The non-magnetic steel plates include a clamping part and a connecting part provided at both ends of the clamping part. The stacking direction of the core column is taken as the first direction, and the clamping part clamps the core column along the first direction. The clamping assembly includes a tensioning member and two web plates. The two web plates are clamped to the yoke along the first direction. The tensioning member is used to provide tension to the two web plates. A splicing seam is formed between the core column and the yoke. The connecting part covers the splicing seam, and the side of the connecting part away from the splicing seam is in contact with the web plate. The clamping part has multiple elongated holes, which are distributed in an array along the width direction of the non-magnetic steel plates. This design allows the web plate to directly press the non-magnetic steel plate against the core without the need for straps, reducing heat accumulation in the non-magnetic steel plate. Furthermore, by creating multiple elongated holes in the non-magnetic steel plate, the magnetic lines of force are interrupted, enabling the non-magnetic steel plate to shield the core column, limiting the magnetic flux and reducing eddy current losses, thus preventing localized hot spots near the tension plate assembly. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1This is a partial structural diagram of the transformer core structure provided in an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 A partial side view diagram of the transformer core structure provided in the document;

[0026] Figure 3 A schematic diagram of the connection between the web plate and the non-magnetic steel plate in the clamping assembly provided in this embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the non-magnetic steel plate provided in an embodiment of the present utility model;

[0028] Figure 5 for Figure 4 A schematic cross-sectional view of section AA in the middle;

[0029] Figure 6 for Figure 4 Schematic diagram of the cross-section of section BB;

[0030] Figure 7 for Figure 4 A schematic cross-sectional view of section CC;

[0031] Figure 8 A schematic diagram of the structure of the first insulating member provided in an embodiment of this utility model;

[0032] Figure 9 for Figure 8 A schematic cross-sectional view of section DD;

[0033] Figure 10 This is a schematic diagram of the structure of the second insulating member provided in an embodiment of the present utility model;

[0034] Figure 11 for Figure 10 A schematic diagram of the side structure;

[0035] Figure 12 A schematic diagram of the front and side structure of a set of silicon steel sheets in the core column provided in an embodiment of this utility model;

[0036] Figure 13 for Figure 12 A schematic diagram of the front and side structures of the first to third silicon steel sheets in the assembly;

[0037] Figure 14 for Figure 12 A schematic diagram of the front and side structures of the fourth to fifth silicon steel sheet in the assembly.

[0038] Explanation of icon numbers:

[0039] 1000. Transformer core structure;

[0040] 1. Iron core; 11. Core column; 111. Silicon steel sheet assembly; 1111. First sheet; 1112. Second sheet; 1113. Third sheet; 1114. Fourth sheet; 1115. Fifth sheet; 12. Yoke; 13. Window;

[0041] 2. Pull plate assembly; 21. Non-magnetic steel plate; 211. Clamping part; 2111. Long strip hole; 212. Connecting part; 2121. Threaded hole; 2122. Limiting hole; 22. First insulating component; 221. First insulating plate; 222. Inclined pad; 223. Pressing pad;

[0042] 3. Clamping assembly; 31. Web plate; 311. Countersunk hole; 32. Tensioner; 321. Pull rod; 322. Pull strap; 33. Limiting shaft; 34. Second insulating component; 341. Second insulating plate; 342. Main pad; 343. Auxiliary pad; 3431. Main body; 3432. Extension;

[0043] X, the first direction; Y, the second direction.

[0044] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0046] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0047] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0048] In a transformer, the core structure is the core structure that enables the transformer to perform its power transformation function, and the transformer's operating condition determines the quality of power supply in the power grid. After the core is laminated in the core processing equipment, tie plates are used to clamp and fix the core column, and web plates are used to clamp and fix the yoke. Typically, tie plates are directly tied to the core column with straps, and web plates are tightened to the yoke with tie rods. Coil windings are usually wound around the outer circumference of the core column.

[0049] The applicant discovered that leakage flux is a common phenomenon inside transformers. However, the leakage flux near the core column directly affects the pull plate. Magnetic field lines pass through and cut the pull plate, causing significant eddy current losses at the pull plate. This results in localized overheating at the pull plate, and the generated heat is transferred to the coil windings. As a result, heat accumulates in the coil windings, leading to overheating. Overheating of the coil windings, in turn, increases the resistance and causes magnetic circuit distortion, ultimately resulting in voltage instability, excessive harmonics, and a decline in power transmission quality.

[0050] In view of this, this utility model proposes a transformer core structure to solve or alleviate the above problems.

[0051] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the transformer core structure 1000 includes a core 1, a pull plate assembly 2, and a clamping assembly 3. The core 1 includes a core column 11 and yokes 12 spliced ​​at both ends of the core column 11. The pull plate assembly 2 includes non-magnetic steel plates 21, with two non-magnetic steel plates 21 corresponding to each core column 11. Each non-magnetic steel plate 21 includes a clamping portion 211 and connecting portions 212 disposed at both ends of the clamping portion 211. The lamination direction of the core column 11 is denoted as the first direction X. Figure 2(In the direction indicated by the middle arrow X), the clamping part 211 clamps the core column 11 along the first direction X; the clamping assembly 3 includes a tensioning member 32 and two web plates 31, the two web plates 31 are clamped to the iron yoke 12 along the first direction X, the tensioning member 32 is used to provide tension to the two web plates 31; a splicing seam is formed between the core column 11 and the iron yoke 12, the connecting part 212 presses against the splicing seam, and the side of the connecting part 212 away from the splicing seam is in contact with the web plate 31, the clamping part 211 has a plurality of elongated holes 2111, the plurality of elongated holes 2111 are arrayed along the width direction of the non-magnetic steel plate 21.

[0052] Specifically, in this embodiment, the non-magnetic steel plate 21 is mainly used to clamp the core column 11, ensuring that the silicon steel sheets in the core column 11 are tightly fitted, thereby reducing the probability of bulging in the core column 11 and improving its short-circuit withstand performance. In this structure, a tensioning member 32 provides tension to the two web plates 31, clamping them to the yoke 12. The web plates 31 are relatively large, and the two ends of the non-magnetic steel plate 21 are pressed tightly by the web plates 31 at the connection 212 between the yoke 12 and the core column 11, thus allowing the non-magnetic steel plate 21 to be clamped to the core column 11 under the pressure of the web plates 31. Furthermore, the core column 11 and the yoke 12 are connected by a splice, forming a splice seam. Bulging is prone to occur near the splice seam. The connection 212 of the non-magnetic steel plate 21 is pressed tightly to the connection seam between the core column 11 and the core 1 by the web plates 31, reducing the probability of bulging in this area.

[0053] According to the technical solution provided in this embodiment, on the one hand, the web plate 31 can directly press the non-magnetic steel plate 21 onto the iron core 1 without the need for binding straps to fix the non-magnetic steel plate 21, thereby reducing one layer of structure between the core column 11 and the coil winding, and thus reducing the heat accumulation in the non-magnetic steel plate 21; on the other hand, the non-magnetic steel plate 21 has extremely low permeability and good anti-magnetization performance, which has a certain effect of reducing eddy current losses. On this basis, by opening multiple elongated holes 2111 on the non-magnetic steel plate 21, the magnetic lines of force in the non-magnetic steel plate 21 are interrupted, thereby enabling the non-magnetic steel plate 21 to shield the core column 11, limiting the magnetic flux in the non-magnetic steel plate 21, thereby reducing eddy current losses and avoiding the generation of local hot areas near the pull plate assembly 2.

[0054] Furthermore, for ease of maintenance, in this embodiment, the non-magnetic steel plate 21 and the web plate 31 are detachably connected. For details, please refer to [link to relevant documentation]. Figures 3 to 7The connecting part 212 has multiple threaded holes 2121, and the web plate 31 has countersunk holes 311 corresponding to the threaded holes 2121. The pull plate assembly 2 also includes screws. The countersunk holes 311 and the threaded holes 2121 are connected by screws. The side of the screw away from the yoke 12 is on the same plane as the side of the web plate 31 away from the yoke 12. Since the distance between the connecting part 212 between the non-magnetic steel plate 21 and the web plate 31 and the lead wire of the coil winding may be small, in order to avoid partial discharge and further reduce eddy current loss, a countersunk hole 311 is provided on the web plate 31 at the position relative to the threaded holes 2121. The countersunk hole 311 is used to completely sink the head of the screw into the web plate 31, so that there are no sharp corners on the surface of the web plate 31. This can avoid energy loss or lead wire damage caused by sharp corner discharge, and at the same time, it can avoid the formation of magnetic flux "concentration points" at sharp corners, further reducing eddy current loss.

[0055] Furthermore, to facilitate the assembly of the non-magnetic steel plate 21 and the web plate 31, a limiting structure is also required between them. For details, please refer to [link to relevant documentation]. Figures 3 to 7 In one embodiment of this utility model, the connecting part 212 has a limiting hole 2122, and the pull plate assembly 2 also includes a limiting shaft 33. The web plate 31 has a mounting through hole, and the limiting shaft 33 is fixedly installed in the mounting through hole, passing through the limiting hole 2122. The side of the limiting shaft 33 away from the yoke 12 and the side of the web plate 31 away from the yoke 12 are on the same plane. The limiting shaft 33 is welded to the mounting through hole or press-fitted. When welding is used, please refer to [reference needed]. Figure 3 To ensure the flatness of the web plate 31, bevels need to be provided on both sides of the mounting through hole, so that the weld is located in the bevel, thus avoiding sharp corners in the web plate 31. This design allows the operator to clearly observe the position of the limiting shaft 33, facilitating its insertion into the limiting block, thereby improving the assembly efficiency between the non-magnetic steel plate 21 and the web plate 31; at the same time, it avoids sharp corners in the web plate 31, thus preventing sharp corner discharge and eddy current losses.

[0056] In another embodiment, a blind hole is provided on the side of the web 31 facing the yoke 12, and a limiting shaft 33 is fixedly installed in the blind hole, with the limiting shaft 33 passing through the limiting hole 2122. This arrangement completely avoids the limiting shaft 33 protruding from the side of the web 31 away from the yoke 12, thereby preventing sharp corners from forming on the side of the web 31 away from the yoke 12. In this embodiment, the limiting shaft 33 and the blind hole are still connected by welding or interference fit. If welding is used, a bevel is only needed on the side of the blind hole facing the yoke 12, so that the weld can be set in the bevel.

[0057] Please see Figure 1 , Figure 8 and Figure 9In one embodiment of this utility model, the pull plate assembly 2 further includes a first insulating member 22, which is installed between the non-magnetic steel plate 21 and the iron core 1. The first insulating member 22 includes a first insulating plate 221 and a plurality of inclined pads 222. The inclined pads 222 are installed on the first insulating plate 221 and are fitted to the clamping part 211. The direction from one iron yoke 12 to another iron yoke 12 is denoted as the second direction Y. Figure 1 (In the direction indicated by the middle arrow Y), the length direction of the inclined pad 222 forms an angle α with the second direction Y, where α satisfies: α∈(0°, 90°); multiple inclined pads 222 are arranged parallel and spaced along the second direction Y. The first insulating member 22 provides insulation for the core column 11 and the non-magnetic steel plate 21. During installation, the inclined pad 222 is in contact with the clamping part 211, and the first insulating plate 221 is in contact with the core column 11. The pads between the clamping part 211 and the core column 11 prevent the clamping effect of the clamping part 211 on the core column 11 from being weakened due to depressions on the surface of the clamping part 211 or the core column 11. In this embodiment, the preferred angle α is 30° to 60°. This arrangement facilitates the flow of transformer oil along the gaps between the inclined pads 222, thereby improving the heat dissipation efficiency of the core column 11 and the clamping part 211. In addition, the setting of the inclined pad 222 reduces the heat transfer efficiency between the core column 11 and the clamping part 211, thereby preventing the clamping part 211 from overheating and affecting the coil winding.

[0058] Further, please refer to Figure 8 In one embodiment of this utility model, the first insulating member 22 further includes a plurality of pressing pads 223. The length direction of the pressing pads 223 is parallel to the second direction Y, and the plurality of pressing pads 223 are installed parallel and spaced apart on the first insulating plate 221. The pressing pads 223 are fitted to the connecting part 212. The pressing pads 223 are positioned corresponding to the splicing seam between the core column 11 and the yoke 12. If the area around the splicing seam between the core column 11 and the yoke 12 is referred to as the splicing area, by setting the length direction of the pressing pads 223 parallel to the second direction Y, compared with the inclined pads 222, the area projected by the pressing pads 223 onto the splicing area is larger. This allows the connecting part 212 to transmit pressure to the splicing area more evenly through the pressing pads 223 and the first insulating plate 221, thereby enhancing the clamping effect of the connecting part 212 on the splicing area and further preventing bulging in the splicing area.

[0059] In one embodiment of this utility model, please refer to Figure 1 , Figure 10 and Figure 11The clamping assembly 3 also includes a second insulating member 34, which is installed between the web plate 31 and the yoke 12. The second insulating member 34 includes a second insulating plate 341 and a plurality of main pads 342. The length direction of each main pad 342 is parallel to the second direction Y, and the plurality of main pads 342 are installed parallel to each other on the second insulating plate 341. By setting the main pads 342, an oil gap structure can be formed between the yoke 12 and the web plate 31, thereby enhancing the insulation performance between the two. In addition, the parallel spacing of the main pads 342 on the second insulating plate 341 can also provide a reasonable force transmission path between the web plate 31 and the yoke 12, so that the web plate 31 can press the yoke 12 tightly to ensure that the yoke 12 does not become loose.

[0060] Further, please refer to Figure 10 and Figure 11 In one embodiment of this utility model, the second insulating member 34 further includes auxiliary pads 343. Auxiliary pads 343 are installed at both ends of the second insulating plate 341. Each auxiliary pad 343 includes a main body 3431 and an extension 3432. The opposite sides of the main body 3431 are respectively attached to the second insulating plate 341 and the web plate 31. The extension 3432 extends along the second direction Y and is attached to the core column 11 to clamp the core column 11. The extension 3432, protruding from the second insulating plate 341, can clamp the core column 11 under the pressure of the web plate 31, thereby further enhancing the clamping effect on the core column 11 and improving the overall strength of the core column 11.

[0061] In one embodiment of this utility model, the tensioning member 32 includes multiple pull rods 321 and multiple pull straps 322. The yoke 12 and the core column 11 enclose a window 13. The pull straps 322 pass through the window 13, and both ends of the pull straps 322 are connected to two web plates 31. Both ends of the pull rods 321 are respectively connected to the two web plates 31. Please refer to [link / reference]. Figure 1 Multiple tie rods 321 are provided. Several tie rods 321 are located at the edge of the web 31 away from the core column 11. Additionally, one side tie rod 321 is provided on each side of the web 31. Bolts are provided at both ends of each tie rod 321 for connection to the web 31. To prevent deformation of the yoke 12 and further tighten the web 31, a strap 322 is provided passing through the window 13 to tighten the web 31 on both sides. Bolts are provided on both sides of the strap 322 for connection to the web 31. By providing tie rods 321 and straps 322, multi-directional tensile force can be provided to the web 31, thereby enhancing the clamping effect of the web 31 on the yoke 12 and the connecting part 212.

[0062] In one embodiment of this utility model, please refer to Figures 12 to 14The core column 11 includes multiple sets of silicon steel sheet groups 111 stacked together. Each silicon steel sheet group 111 includes a first sheet 1111, a second sheet 1112, a third sheet 1113, a fourth sheet 1114, and a fifth sheet 1115 stacked in a transversely stepped manner. Each of the first sheet 1111 to the fifth sheet 1115 is formed by splicing two sub-sheets together. Along the direction perpendicular to the first sheet 1111, the splicing lines of the first sheet 1111, the second sheet 1112, and the third sheet 1113 coincide, and the splicing lines of the fourth sheet 1114 and the fifth sheet 1115 coincide. The splicing lines of the first sheet 1111 to the third sheet 1113 and the fourth sheet 1114 to the fifth sheet 1115 are staggered. The dimensions of the first sheet 1111 to the fifth sheet 1115 are all different, and each sheet is transversely stepped, forming a five-level stepped structure. Compared to the commonly used three-stage step structure, the five-stage joint design more easily disperses magnetic flux, resulting in a more uniform eddy current distribution, reducing local hot spots, and lowering the transformer's no-load loss by 1% to 2%. The first 1111 to the fifth 1115 sheets are all silicon steel sheets, each composed of two sub-sheets, facilitating easy handling by workers. Furthermore, the overlapping splicing lines of the first to third sheets allow workers to pick up one sub-sheet from each of the first to third sheets at a time, meaning they can simultaneously pick up three sub-sheets and place them on the stacking device, then pick up the remaining three sub-sheets from the first to third sheets and place them on the stacking device. Thus, workers only need to perform two picking and placing actions to complete the stacking operation of the first 1111 to the third 1113 sheets, thereby improving the efficiency of the stacking process. Furthermore, the interlacing of the seams of the first to third sheets and the fourth to fifth sheets, after multiple sets of silicon steel sheet groups 111 are stacked, allows the silicon steel sheets in the core column 11 to be interlaced and clamped tightly, thereby improving the overall strength of the core column 11. It should be noted that the iron yoke 12 and the core column 11 are assembled to form the iron core 1, and the lamination pattern of the iron yoke 12 needs to be compatible with the lamination pattern of the core column 11.

[0063] This utility model also proposes a transformer, which includes a transformer core structure 100. The specific structure of the transformer core structure 100 is as described in the above embodiments. Since this transformer adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The transformer also includes coil windings and a shell. The coil windings are wound on the core column, and a receiving cavity is formed inside the shell. The transformer core structure and the coil windings are both installed in the receiving cavity. The coil windings constitute the circuit part of the transformer, divided into a primary winding and a secondary winding, which are connected to the power supply and the load respectively, and voltage transformation is achieved through the turns ratio. After the coil windings are wound on the core column 11, the coil windings and the core 1 constitute the core transformer structure. By installing the core transformer structure in the receiving cavity, the shell can prevent rainwater, dust, foreign objects, etc., from entering the transformer, avoiding short circuits or mechanical damage to the core transformer structure.

[0064] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A transformer core structure, characterized by, include: The iron core includes a core column and iron yokes spliced ​​to both ends of the core column; A plate assembly includes non-magnetic steel plates. Each core column is provided with two non-magnetic steel plates. Each non-magnetic steel plate includes a clamping part and a connecting part provided at both ends of the clamping part. The stacking direction of the core column is denoted as the first direction. The clamping part clamps the core column along the first direction. The clamping assembly includes a tensioner and two webs, the two webs being clamped to the yoke along the first direction, the tensioner being used to provide a tensile force to the two webs; A splicing seam is formed between the core column and the yoke. The connecting part covers the splicing seam, and the side of the connecting part away from the splicing seam is in contact with the web. The clamping part has multiple elongated holes, which are arranged in an array along the width direction of the non-magnetic steel plate.

2. The transformer core structure of claim 1, wherein The connecting part has multiple threaded holes, and the web plate has countersunk holes corresponding to the threaded holes. The pull plate assembly also includes screws. The countersunk holes and the threaded holes are connected by the screws. The side of the screw away from the yoke is on the same plane as the side of the web plate away from the yoke.

3. The transformer core structure as described in claim 2, characterized in that, The connecting part has a limiting hole, the pull plate assembly also includes a limiting shaft, the web has a mounting through hole, the limiting shaft is fixedly installed in the mounting through hole, and the limiting shaft passes through the limiting hole. The side of the limiting shaft away from the yoke and the side of the web away from the yoke are on the same plane.

4. The transformer core structure as described in claim 2, characterized in that, The connecting part has a limiting hole, the pull plate assembly also includes a limiting shaft, the web plate has a blind hole on the side facing the yoke, the limiting shaft is fixedly installed in the blind hole, and the limiting shaft passes through the limiting hole.

5. The transformer core structure as described in claim 1, characterized in that, The pull plate assembly further includes a first insulating component, which is installed between the non-magnetic steel plate and the iron core. The first insulating component includes a first insulating plate and a plurality of inclined pads. The inclined pads are installed on the first insulating plate and are fitted to the clamping part. Let the direction from one of the iron yokes to another iron yoke be the second direction, and let the length direction of the inclined pad block make an angle α with the second direction. Then, α satisfies: α∈(0°, 90°); The plurality of inclined pads are arranged parallel to each other along the second direction.

6. The transformer core structure as described in claim 5, characterized in that, The first insulating component further includes a plurality of crimping pads, the length direction of which is parallel to the second direction, and the plurality of crimping pads are installed parallel and spaced apart on the first insulating plate, and the crimping pads are fitted to the connecting portion.

7. The transformer core structure as described in claim 5, characterized in that, The clamping assembly further includes a second insulating member, which is installed between the web and the yoke; The second insulating component includes a second insulating plate and a plurality of main pads, the length direction of which is parallel to the second direction, and the plurality of main pads are installed on the second insulating plate in parallel at intervals.

8. The transformer core structure as described in claim 7, characterized in that, The second insulating component further includes auxiliary pads. The auxiliary pads are installed at both ends of the second insulating plate. Each auxiliary pad includes a main body and an extension. The opposite sides of the main body are respectively attached to the second insulating plate and the web plate. The extension extends along the second direction and is attached to the core column to clamp the core column.

9. The transformer core structure as described in claim 1, characterized in that, The core column includes multiple sets of silicon steel sheets arranged in layers. Each set of silicon steel sheets includes a first sheet, a second sheet, a third sheet, a fourth sheet, and a fifth sheet stacked in a transverse step. Each of the first to the fifth sheets is formed by splicing two sub-sheets together. Along a direction perpendicular to the first piece, the splicing lines of the first piece, the second piece, and the third piece coincide, the splicing lines of the fourth piece and the fifth piece coincide, and the splicing lines from the first piece to the third piece and from the fourth piece to the fifth piece are staggered.

10. A transformer, characterized in that, The transformer includes a transformer core structure as described in any one of claims 1 to 9, and the transformer further includes a coil winding and a housing. The coil winding is wound around the core column, and a receiving cavity is formed inside the housing. The transformer core structure and the coil winding are both installed in the receiving cavity.

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