A low-voltage coil structure convenient to wind and a transformer

Abstract

The utility model relates to transformer technical field, especially low voltage coil structure and transformer convenient to wind of a kind of, including first coil module, insulating module and second coil module are sequentially connected from top to bottom;Insulating module includes insulating ring and several insulating blocks;Several insulating blocks are arranged along the circumferential direction interval of insulating ring, and every insulating block is connected with insulating ring;And first middle insulation, first interlayer insulation and first bracing curtain are respectively connected with the abutting connection of several insulating blocks top, second middle insulation, second interlayer insulation and second bracing curtain are respectively connected with the abutting connection of several insulating blocks bottom;Can avoid the wrinkled accumulation of first interlayer insulation and second interlayer insulation, can reduce the misalignment and dislocation of first bracing curtain and second bracing curtain, solve the wrinkled accumulation of interlayer insulation of existing low voltage coil structure, and oil passage bracing curtain misalignment and dislocation easily lead to poor oil flow effect, also make coil stress imbalance and deformation problem.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a low-voltage coil structure and transformer that are easy to wind. Background Technology

[0002] The low-voltage coil is the core component of a transformer, responsible for transmitting electrical energy and converting voltage to meet the needs of various electrical devices. Low-voltage foil coils generally employ a multi-layered cylindrical structure, wound from conductive materials (such as aluminum or copper foil), interlayer insulation, and oil channel support strips. The conductive layer typically uses a segmented design, consisting of two foil sheets arranged at intervals. To meet electrical safety requirements, the opposite ends of the two foil sheets are connected by a central insulation, while the opposing ends are connected to end insulation. During winding, the central and end insulation are wound synchronously with the foil sheets.

[0003] Interlayer insulation, oil duct support strips, and intermediate insulation often employ a one-piece design, meaning a single piece of material with a large height span is continuously wound. As the number of winding layers increases, the curvature changes, leading to uneven tension in each layer. This causes wrinkling and buildup in the one-piece interlayer insulation, disrupting the continuity of the coil structure. Furthermore, the wrinkling and buildup can cause axial displacement of the interlayer insulation along the coil, exposing some conductive layers and creating small gaps with adjacent conductive layers, resulting in localized temperature increases in the low-voltage coil and affecting the transformer's safe operation and service life. Simultaneously, the large height span of the one-piece oil duct support strips, combined with the wrinkling and buildup of the interlayer insulation, makes misalignment and misalignment during winding prone to occur. In this case, the oil duct gap (the gap between two support strips) is compressed by the conductive layers and interlayer insulation, causing localized narrowing or bending, resulting in poor oil flow and excessively high localized coil temperature. Under short-circuit conditions, this can also cause coil deformation due to stress imbalance. In addition, multiple rework adjustments are required during coil winding, increasing the rework rate and reducing overall coil winding efficiency. Utility Model Content

[0004] The main purpose of this utility model is to provide a low-voltage coil structure that is easy to wind, which can effectively avoid the wrinkling and accumulation of the first and second interlayer insulation during the winding process. It can reduce the misalignment and misplacement of the first and second support curtains during winding, and solve the problems of wrinkling and accumulation of interlayer insulation in existing low-voltage coil structures, which damages the continuity of the coil structure, affects the safe operation and service life of transformers, and the misalignment and misplacement of oil channel support curtains, which leads to poor oil flow and coil deformation due to stress imbalance.

[0005] Another objective of this invention is to provide a transformer including the aforementioned low-voltage coil structure, which can ensure the safe operation of the transformer, extend its service life, and ensure accurate alignment of the first and second support curtains, thereby improving oil flow efficiency and further enhancing the transformer's heat dissipation performance. This solves the problems of easy wrinkling and accumulation of interlayer insulation in existing low-voltage coil structures, which disrupts the continuity of the coil structure and affects the safe operation and service life of the transformer. Furthermore, it addresses the issues of inaccurate alignment and misalignment of the oil channel support curtains, leading to poor oil flow efficiency and causing coil deformation due to stress imbalance.

[0006] To achieve the above objectives, the present invention proposes a low-voltage coil structure that is easy to wind, comprising a first coil module, an insulation module, and a second coil module connected sequentially from top to bottom. Both the first coil module and the second coil module are multi-layer cylindrical structures. The insulation module includes an insulation ring and a plurality of insulation blocks; the axes of the insulation ring, the first coil module and the second coil module coincide; the plurality of insulation blocks are arranged at intervals along the circumference of the insulation ring, and each insulation block is connected to the insulation ring; The first coil module includes several first end insulations, several first middle insulations, several first conductive layers, several first interlayer insulations, and several first support strips; the top and bottom ends of each first conductive layer are respectively provided with the first end insulation and the first middle insulation, and the first interlayer insulation or the first support strip is provided between two adjacent first conductive layers. The second coil module includes several second end insulations, several second middle insulations, several second conductive layers, several second interlayer insulations, and several second support strips; the top and bottom ends of each second conductive layer are respectively provided with second middle insulation and second end insulation, and the second interlayer insulation or second support strips are provided between two adjacent second conductive layers; Furthermore, the first central insulation, the first interlayer insulation, and the first support strip are all connected to the top of the plurality of insulating blocks, and the second central insulation, the second interlayer insulation, and the second support strip are all connected to the bottom of the plurality of insulating blocks.

[0007] Optionally, the plurality of insulating blocks are all horizontally arranged, and each insulating block has a groove at one end along its length direction that mates with the insulating ring. The groove extends through the insulating block along its width direction, and the insulating ring is engaged in the groove.

[0008] Optionally, the insulating ring includes a first straight segment, a first arc segment, a second straight segment, and a second arc segment connected end to end in sequence; the first straight segment and the second straight segment are arranged in parallel, and the first arc segment and the second arc segment are arranged opposite to each other; the first straight segment, the first arc segment, the second straight segment, and the second arc segment are all connected to a plurality of insulating blocks.

[0009] Optionally, the plurality of insulating blocks are symmetrically distributed about the line connecting the midpoint of the first straight segment and the midpoint of the second straight segment as an axis of symmetry.

[0010] Optionally, the height H1 of the first end insulation is greater than the height H2 of the first middle insulation; the height H4 of the second end insulation is greater than the height H3 of the second middle insulation.

[0011] Optionally, the height H1 of the first end insulation is the same as the height H4 of the second end insulation; the height H2 of the first middle insulation is the same as the height H3 of the second middle insulation.

[0012] Optionally, the height of the first support strip curtain is the same as the height of the second support strip curtain.

[0013] Optionally, the low-voltage coil structure further includes a terminal block module, which includes a first inner terminal block, a first outer terminal block, a second inner terminal block, and a second outer terminal block. The first external terminal block and the second external terminal block are both disposed on the outside of the first coil module and the second coil module, and the first internal terminal block and the second internal terminal block are both disposed on the inside of the first coil module and the second coil module; the first internal terminal block is disposed opposite to the first external terminal block, the second internal terminal block is disposed opposite to the second external terminal block, and the first internal terminal block is located between the first external terminal block and the second internal terminal block; The first inner terminal block, the first outer terminal block, the second inner terminal block, and the second outer terminal block all extend in a vertical direction, and one end of the first inner terminal block, one end of the first outer terminal block, one end of the second inner terminal block, and one end of the second outer terminal block all extend out of the first coil module. The first inner terminal block is connected to the starting end of the first conductive layer, and the first outer terminal block is connected to the end of the first conductive layer; the second inner terminal block is connected to the starting end of the second conductive layer, and the second outer terminal block is connected to the end of the second conductive layer.

[0014] This utility model also proposes a transformer, including any of the aforementioned low-voltage coil structures that are easy to wind.

[0015] Compared with the prior art, the embodiments of this utility model have the following beneficial effects: 1. In this low-voltage coil structure, the interlayer insulation, support curtain, and middle insulation all adopt a component-type structure. Specifically, it includes a first interlayer insulation, a second interlayer insulation, a first middle insulation, a second middle insulation, a first support curtain, and a second support curtain. The heights of the first and second interlayer insulations are both less than the height of a single-piece interlayer insulation. By using first and second interlayer insulations with smaller height spans, wrinkling and accumulation of the first and second interlayer insulations during winding can be effectively avoided, reducing the wrinkling rate of the interlayer insulation, minimizing rework, and preventing axial misalignment of the first and second interlayer insulations that could expose part of the conductive layer. This further ensures the safe operation of the transformer and extends its service life. This low-voltage coil structure, using a component-type structure, has the advantages of low winding difficulty, high winding efficiency, and high structural continuity.

[0016] 2. In this low-voltage coil structure, the insulation components include an insulating ring and several insulating blocks. The insulating ring serves as a connector, linking the insulating blocks together to further improve assembly efficiency. The insulating blocks not only provide support for the first coil module, but also, together with the first and second central insulation sections, achieve electrical isolation, effectively isolating the first and second coil modules and meeting electrical safety requirements.

[0017] 3. In this low-voltage coil structure, the height of the first and second support curtains is smaller than that of the one-piece oil channel support curtain. As the wrinkling and accumulation of the first and second interlayer insulation are reduced, the misalignment and misalignment of the first and second support curtains during winding can be reduced. In addition, the first support curtain is set to abut the top of several insulating blocks, and the second support curtain is set to abut the bottom of several insulating blocks. During winding, the first and second support curtains can be aligned with the insulating blocks, which can further reduce the misalignment and misalignment of the first and second support curtains during winding, improve the oil flow effect, further improve the heat dissipation performance of the transformer, and prevent the overall coil from deforming due to stress imbalance under short-circuit conditions. Attached Figure Description

[0018] Figure 1 This is a front view of a low-voltage coil structure that is easy to wind, according to an embodiment of the present invention. Figure 2 This is a partial exploded view of an insulating module of a low-voltage coil structure that is easy to wind, according to an embodiment of the present invention. Figure 3 for Figure 1 A top view showing the first end insulation hidden; Figure 4This is a cross-sectional view of a low-voltage coil structure that is easy to wind according to an embodiment of the present invention; Figure 5 This is a front view of a low-voltage coil structure that is easy to wind, according to another embodiment of the present invention.

[0019] In the attached diagram: 1. First coil module; 11. First end insulation; 12. First middle insulation; 13. First conductive layer; 14. First interlayer insulation; 15. First support strip curtain; 2. Insulation module; 21. Insulation ring; 211. First straight segment; 212. First arc segment; 213. Second straight segment; 214. Second arc segment; 22. Insulating block; 221. Groove; 3. Second coil module; 31. Second end insulation; 32. Second middle insulation; 33. Second conductive layer; 34. Second interlayer insulation; 35. Second support strip curtain; 4. Terminal block module; 41. First inner terminal block; 42. First outer terminal block; 43. Second inner terminal block; 44. Second outer terminal block. Detailed Implementation

[0020] 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.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Furthermore, in this utility model, descriptions involving "first," "second," etc., 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, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. 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.

[0024] This invention proposes a low-voltage coil structure that is easy to wind.

[0025] In the embodiments of this utility model, such as Figures 1 to 4 As shown, the easy-to-wind low-voltage coil structure includes a first coil module 1, an insulation module 2, and a second coil module 3 connected sequentially from top to bottom. Both the first coil module 1 and the second coil module 3 are multi-layer cylindrical structures. The insulation module 2 includes an insulation ring 21 and several insulation blocks 22; the axes of the insulation ring 21, the first coil module 1 and the second coil module 3 coincide; the several insulation blocks 22 are arranged at intervals along the circumference of the insulation ring 21, and each insulation block 22 is connected to the insulation ring 21. The first coil module 1 includes several first end insulations 11, several first middle insulations 12, several first conductive layers 13, several first interlayer insulations 14, and several first support curtains 15; each first conductive layer 13 has a first end insulation 11 and a first middle insulation 12 at its top and bottom respectively, and a first interlayer insulation 14 or a first support curtain 15 is provided between two adjacent first conductive layers 13. The second coil module 3 includes several second end insulations 31, several second middle insulations 32, several second conductive layers 33, several second interlayer insulations 34, and several second support curtains 35; each second conductive layer 33 has a second middle insulation 32 and a second end insulation 31 at its top and bottom respectively, and a second interlayer insulation 34 or a second support curtain 35 is provided between two adjacent second conductive layers 33. Furthermore, the first central insulation 12, the first interlayer insulation 14, and the first support curtain 15 are all connected to the top of several insulating blocks 22, and the second central insulation 32, the second interlayer insulation 34, and the second support curtain 35 are all connected to the bottom of several insulating blocks 22.

[0026] In this low-voltage coil structure, the interlayer insulation, support curtain, and middle insulation all adopt a component-based structure. Specifically, it includes a first interlayer insulation 14, a second interlayer insulation 34, a first middle insulation 12, a second middle insulation 32, a first support curtain 15, and a second support curtain 35. The heights of the first interlayer insulation 14 and the second interlayer insulation 34 are both less than the height of a single-piece interlayer insulation. By using the smaller height difference between the first and second interlayer insulation 14 and 34, wrinkling and accumulation of the first and second interlayer insulation 14 and 34 during winding can be effectively avoided, reducing the wrinkling rate of the interlayer insulation, minimizing rework, and preventing axial displacement of the first and second interlayer insulation 14 and 34 that could expose part of the conductive layer. This further ensures the safe operation of the transformer and extends its service life. This low-voltage coil structure, using a component-based design, has the advantages of low winding difficulty, high winding efficiency, and high structural continuity.

[0027] In this low-voltage coil structure, the insulation components include an insulating ring 21 and several insulating blocks 22. The insulating ring 21 serves as a connector, linking the insulating blocks 22 together, which further improves assembly efficiency. The insulating blocks 22 not only provide support for the first coil module 1, but also, together with the first central insulation 12 and the second central insulation 32, achieve electrical isolation, effectively isolating the first coil module 1 and the second coil module 3 to meet electrical safety requirements.

[0028] In this low-voltage coil structure, the height of the first support curtain 15 and the second support curtain 35 is smaller than that of the one-piece oil channel support curtain. As the wrinkling and accumulation of the first interlayer insulation 14 and the second interlayer insulation 34 are reduced, the misalignment and misalignment of the first support curtain 15 and the second support curtain 35 during winding can be reduced. In addition, the arrangement of the first support curtain 15 abutting against the top of several insulating blocks 22 and the arrangement of the second support curtain 35 abutting against the bottom of several insulating blocks 22 can be used to align the first support curtain 15 and the second support curtain 35 during winding with the help of several insulating blocks 22. This can further reduce the misalignment and misalignment of the first support curtain 15 and the second support curtain 35 during winding, improve the oil flow effect, further improve the heat dissipation performance of the transformer, and prevent the overall coil from deforming due to stress imbalance under short-circuit conditions.

[0029] This invention solves the problems of easy wrinkling and accumulation of interlayer insulation in existing low-voltage coil structures, which disrupts the continuity of the coil structure. At the same time, the wrinkling and accumulation of interlayer insulation causes axial displacement along the coil, exposing part of the conductive layer and creating a small gap discharge with the adjacent conductive layer, affecting the safe operation and service life of the transformer. Furthermore, the oil channel support curtain is prone to misalignment and misplacement, resulting in poor oil flow and causing coil stress imbalance and deformation.

[0030] To elaborate further, such as Figure 3 As shown, the innermost layer of the first coil module 1 and the innermost layer of the second coil module 3 are both inner insulating cylinders. The inner insulating cylinder is usually composed of cardboard (1mm thick) and a layer of low-voltage interlayer insulation. The thickness of the first interlayer insulation 14, the second interlayer insulation 34 and the low-voltage interlayer insulation is very thin, about 0.15mm.

[0031] like Figure 4 As shown, in one embodiment of this application, the first coil module 1 is provided with, from the inside out, an inner insulating cylinder (not shown in the figure), a first conductive layer 13, a first interlayer insulation 14, a first conductive layer 13, a first interlayer insulation 14, a first conductive layer 13, a first support curtain 15, a first conductive layer 13, a first interlayer insulation 14, a first conductive layer 13, a first interlayer insulation 14, a first conductive layer 13, a first support curtain 15, and a first conductive layer 13; each first conductive layer 13 has a first end insulation 11 and a first middle insulation 12 at its top and bottom ends, respectively; The second coil module 3 is arranged from the inside out as follows: an inner insulating cylinder (not shown in the figure), a second conductive layer 33, a second interlayer insulation 34, a second conductive layer 33, a second interlayer insulation 34, a second conductive layer 33, a second support curtain 35, a second conductive layer 33, a second interlayer insulation 34, a second conductive layer 33, a second interlayer insulation 34, a second conductive layer 33, a second support curtain 35, and a second conductive layer 33; each second conductive layer 33 has a second middle insulation 32 and a second end insulation 31 at its top and bottom ends, respectively.

[0032] like Figure 2 As shown, in one embodiment of this application, a plurality of insulating blocks 22 are horizontally arranged, and each insulating block 22 has a groove 221 that cooperates with the insulating ring 21 at one end of its own length direction. The groove 221 penetrates the insulating block 22 along the width direction of the insulating block 22, and the insulating ring 21 is engaged in the groove 221.

[0033] By providing a groove 221 and having an insulating ring 21 engaged within it, the insulating ring 21 stably connects several insulating blocks 22 together. The insulating ring 21 also positions these insulating blocks 22, preventing displacement or loosening of the insulating blocks 22 when subjected to external forces, thus further improving the stability of the low-voltage coil structure. The groove 221 extends through the insulating block 22 along its width, facilitating the engagement of the insulating ring 21 and improving the assembly efficiency of the insulating module 2.

[0034] like Figure 2As shown, in one embodiment of this application, the insulating ring 21 includes a first straight segment 211, a first arc segment 212, a second straight segment 213, and a second arc segment 214 connected end to end in sequence; the first straight segment 211 and the second straight segment 213 are arranged in parallel, and the first arc segment 212 and the second arc segment 214 are arranged opposite to each other; the first straight segment 211, the first arc segment 212, the second straight segment 213, and the second arc segment 214 are all connected to a plurality of insulating blocks 22.

[0035] The insulating ring 21 includes a first straight segment 211, a first arc segment 212, a second straight segment 213, and a second arc segment 214. By setting two straight segments and two arc segments, the insulating ring 21 and several insulating blocks 22 can be stably connected together, thereby ensuring that the first support curtain 15 and the second support curtain 35 can abut against these insulating blocks 22. Moreover, the insulating ring 21, which combines straight segments and arc segments, can better fit the actual shape of the first coil module 1 and the second coil module 3, thereby further ensuring the structural stability of this low-voltage coil structure.

[0036] like Figure 2 As shown, in one embodiment of this application, a plurality of insulating blocks 22 are symmetrically distributed with the line connecting the midpoint of the first straight line segment 211 and the midpoint of the second straight line segment 213 as the axis of symmetry.

[0037] The arrangement of several insulating blocks 22 symmetrically distributed with the line connecting the midpoint of the first straight segment 211 and the midpoint of the second straight segment 213 as the axis of symmetry is beneficial for the alignment of the first support curtain 15 and the second support curtain 35 during winding, ensuring accurate alignment of the first support curtain 15 and the second support curtain 35. Moreover, the symmetrically distributed insulating blocks 22 can evenly distribute stress, effectively preventing local deformation of the low-voltage coil structure due to uneven stress on the first central insulation 12, the second central insulation 32, the first interlayer insulation 14, the second interlayer insulation 34, the first support curtain 15, and the second support curtain 35, thus ensuring the overall stability of the low-voltage coil structure.

[0038] like Figure 1 As shown, in one embodiment of this application, the height H1 of the first end insulation 11 is greater than the height H2 of the first middle insulation 12; the height H4 of the second end insulation 31 is greater than the height H3 of the second middle insulation 32.

[0039] To ensure the electrical safety of this low-voltage coil structure and prevent end breakdown of the overall structure, the heights of the first end insulation 11 at the top and the second end insulation 31 at the bottom of the overall structure need to be relatively large. The first middle insulation 12 and the second middle insulation 32 are used to isolate the first conductive layer 13 and the second conductive layer 33. Since the potential difference between the first conductive layer 13 and the second conductive layer 33 is small, the heights of the first middle insulation 12 and the second middle insulation 32 can be relatively small. Therefore, the height H1 of the first end insulation 11 is larger than the height H2 of the first middle insulation 12, and the height H4 of the second end insulation 31 is larger than the height H3 of the second middle insulation 32.

[0040] like Figure 1 As shown, in one embodiment of this application, the height H1 of the first end insulation 11 is the same as the height H4 of the second end insulation 31; the height H2 of the first middle insulation 12 is the same as the height H3 of the second middle insulation 32.

[0041] The height H1 of the first end insulation 11 is the same as the height H4 of the second end insulation 31, and the height H2 of the first middle insulation 12 is the same as the height H3 of the second middle insulation 32. In this way, the first end insulation 11 and the second end insulation 31 can use the same size and specification of insulation material in actual production, and the first middle insulation 12 and the second middle insulation 32 can use the same size and specification of insulation material in actual production. This not only reduces the assembly difficulty but also improves production efficiency.

[0042] like Figure 4 As shown, in one embodiment of this application, the height of the first support curtain 15 is the same as the height of the second support curtain 35.

[0043] The first support curtain 15 and the second support curtain 35 are at the same height. This can further ensure that the first support curtain 15 and the second support curtain 35 are accurately aligned, simplify the assembly steps, improve production efficiency, and reduce production costs.

[0044] like Figure 5 As shown, in one embodiment of this application, the low-voltage coil structure further includes a terminal block module 4, which includes a first inner terminal block 41, a first outer terminal block 42, a second inner terminal block 43, and a second outer terminal block 44. The first external terminal block 42 and the second external terminal block 44 are both disposed on the outside of the first coil module 1 and the second coil module 3, and the first internal terminal block 41 and the second internal terminal block 43 are both disposed on the inside of the first coil module 1 and the second coil module 3; the first internal terminal block 41 is disposed opposite to the first external terminal block 42, the second internal terminal block 43 is disposed opposite to the second external terminal block 44, and the first internal terminal block 41 is located between the first external terminal block 42 and the second internal terminal block 43; The first inner terminal block 41, the first outer terminal block 42, the second inner terminal block 43, and the second outer terminal block 44 are all arranged to extend in the vertical direction, and one end of the first inner terminal block 41, one end of the first outer terminal block 42, one end of the second inner terminal block 43, and one end of the second outer terminal block 44 simultaneously extend out of the first coil module 1; The first inner terminal block 41 is connected to the starting end of the first conductive layer 13, and the first outer terminal block 42 is connected to the end of the first conductive layer 13; the second inner terminal block 43 is connected to the starting end of the second conductive layer 33, and the second outer terminal block 44 is connected to the end of the second conductive layer 33.

[0045] In this low-voltage coil structure, the first inner terminal block 41, the first outer terminal block 42, the second inner terminal block 43, and the second outer terminal block 44 are respectively connected to the corresponding conductive layers and led out. Thus, in actual assembly, each terminal block only needs to be connected to a connecting block, which in turn connects to the corresponding low-voltage bushing (the low-voltage bushing is located outside the transformer tank). This allows the low-voltage coil structure to further adapt to different power grid standards and operating requirements, achieving efficient power transmission and voltage conversion.

[0046] This utility model also proposes a transformer, including the above-mentioned low-voltage coil structure.

[0047] This transformer includes the aforementioned low-voltage coil structure. The first interlayer insulation 14 and the second interlayer insulation 34 of the low-voltage coil structure have a low wrinkling rate, resulting in fewer rework issues during actual production. This also prevents axial misalignment of the first and second interlayer insulation 14 and 34, which could expose part of the conductive layer, ensuring safe operation and extending the transformer's service life. Furthermore, the accurate alignment of the first and second support curtains 15 and 35 improves oil flow and further enhances the transformer's heat dissipation performance. This solves the problems of wrinkling and buildup of interlayer insulation in existing low-voltage coil structures, which disrupts the continuity of the coil structure and affects the transformer's safe operation and service life. Additionally, it addresses the issues of misalignment and misalignment of the oil channel support curtains, leading to poor oil flow and coil deformation due to stress imbalance.

[0048] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A low voltage coil construction for facilitating winding, characterized in that It includes a first coil module, an insulation module, and a second coil module connected sequentially from top to bottom. Both the first coil module and the second coil module are multi-layer cylindrical structures. The insulation module includes an insulation ring and a plurality of insulation blocks; the axes of the insulation ring, the first coil module and the second coil module coincide; the plurality of insulation blocks are arranged at intervals along the circumference of the insulation ring, and each insulation block is connected to the insulation ring; The first coil module includes several first end insulations, several first middle insulations, several first conductive layers, several first interlayer insulations, and several first support strips; the top and bottom ends of each first conductive layer are respectively provided with the first end insulation and the first middle insulation, and the first interlayer insulation or the first support strip is provided between two adjacent first conductive layers. The second coil module includes several second end insulations, several second middle insulations, several second conductive layers, several second interlayer insulations, and several second support strips; the top and bottom ends of each second conductive layer are respectively provided with second middle insulation and second end insulation, and the second interlayer insulation or second support strips are provided between two adjacent second conductive layers; Furthermore, the first central insulation, the first interlayer insulation, and the first support strip are all connected to the top of the plurality of insulating blocks, and the second central insulation, the second interlayer insulation, and the second support strip are all connected to the bottom of the plurality of insulating blocks.

2. The low-voltage coil structure for easy winding according to claim 1, characterized in that, The insulating blocks are all horizontally arranged, and each insulating block has a groove at one end along its length that mates with the insulating ring. The groove extends through the insulating block along its width, and the insulating ring is engaged in the groove.

3. The low voltage coil construction for easy winding of claim 1, wherein, The insulating ring includes a first straight segment, a first arc segment, a second straight segment, and a second arc segment connected end to end in sequence; the first straight segment and the second straight segment are arranged in parallel, and the first arc segment and the second arc segment are arranged opposite to each other; the first straight segment, the first arc segment, the second straight segment, and the second arc segment are all connected to a plurality of insulating blocks.

4. The low voltage coil structure for easy winding of claim 3, wherein, The insulating blocks are symmetrically distributed with the line connecting the midpoint of the first straight line segment and the midpoint of the second straight line segment as the axis of symmetry.

5. The low voltage coil construction for easy winding of claim 1, wherein, The height H1 of the first end insulation is greater than the height H2 of the first middle insulation; the height H4 of the second end insulation is greater than the height H3 of the second middle insulation.

6. The low voltage coil structure for easy winding of claim 5, wherein, The height H1 of the first end insulation is the same as the height H4 of the second end insulation; the height H2 of the first middle insulation is the same as the height H3 of the second middle insulation.

7. The low voltage coil construction for easy winding of claim 1, wherein, The height of the first support strip curtain is the same as the height of the second support strip curtain.

8. The low voltage coil construction for easy winding of claim 1, wherein, The low-voltage coil structure also includes a terminal block module, which includes a first inner terminal block, a first outer terminal block, a second inner terminal block, and a second outer terminal block. The first external terminal block and the second external terminal block are both disposed on the outside of the first coil module and the second coil module, and the first internal terminal block and the second internal terminal block are both disposed on the inside of the first coil module and the second coil module; the first internal terminal block is disposed opposite to the first external terminal block, the second internal terminal block is disposed opposite to the second external terminal block, and the first internal terminal block is located between the first external terminal block and the second internal terminal block; The first inner terminal block, the first outer terminal block, the second inner terminal block, and the second outer terminal block all extend in a vertical direction, and one end of the first inner terminal block, one end of the first outer terminal block, one end of the second inner terminal block, and one end of the second outer terminal block all extend out of the first coil module. The first inner terminal block is connected to the starting end of the first conductive layer, and the first outer terminal block is connected to the end of the first conductive layer; the second inner terminal block is connected to the starting end of the second conductive layer, and the second outer terminal block is connected to the end of the second conductive layer.

9. A transformer, characterized by Includes the low-voltage coil structure that is easy to wind as described in any one of claims 1 to 8.

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