Combined supporting plate structure of transformer

Abstract

The utility model provides a combined type supporting plate structure of a transformer, which relates to the technical field of transformers and comprises an iron core column, a low-voltage coil sleeved outside the iron core column, a plurality of iron core binding tapes and at least one supporting plate component. The multiple iron core binding belts are sequentially arranged at intervals in the axial direction of the iron core column, the supporting plate assembly is arranged between the low-voltage coil and the iron core column and comprises a first supporting plate and a second supporting plate which are matched in an aligned mode, the first supporting plate is a double-layer structural plate composed of an elastic buffering layer and an insulating heat-resisting layer, the elastic buffering layer is provided with multiple first grooves, and the second supporting plate is provided with multiple second grooves. The iron core binding belts are matched with the first grooves in a one-to-one correspondence mode, the iron core binding belts are embedded in the first grooves in an aligned mode, one plate face of the second supporting plate abuts against the insulating heat-resisting layer, and the other plate face of the second supporting plate abuts against the low-voltage coil. The combined supporting plate structure of the transformer can effectively improve the stability of the iron core and the coil.

Description

Technical Field

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

[0002] For high-capacity, high-voltage dry-type transformers, the core is typically composed of multiple stacked silicon steel sheets, resulting in a complex structure. The design of the core support plate must ensure the stacking accuracy and stability of the silicon steel sheets. The core support plate is one of the important structural components inside the transformer, primarily used to support and fix the core, while also serving as insulation, heat dissipation, and mechanical support. During operation, the transformer is subjected to external forces such as electromagnetic forces, wind pressure, and vibration; the core support plate must possess sufficient mechanical strength to prevent core deformation or loosening. The core support plate is usually made of insulating materials (such as epoxy glass plates) and must meet the insulation requirements under high-voltage conditions to prevent short circuits or discharges.

[0003] Currently, high-capacity dry-type transformers typically have epoxy board supports, which are lower than the coil height, tied to the straight sections of the core using DMD (a three-layer composite material of polyester film, polyester fiber nonwoven fabric, and polyester film) and fiberglass tape before the coils are wound.

[0004] After the support plates are tied, the coils need to be installed. Therefore, the thickness of the support plates needs to be less than the clearance between the coils and the core. As a result, the support plates cannot actually tighten the core and the low-voltage coils, leading to poor stability of the core and coils. On the one hand, the transformer will generate noise during operation; on the other hand, the transformer's short-circuit withstand capability will be reduced. When an external short circuit occurs, the huge inrush current will subject the transformer coils to a large electromagnetic force, causing the coils to deform and preventing the entire transformer from working properly, or even worse, rendering the transformer unusable.

[0005] In view of this, based on years of experience in production and design in this and related fields, the inventor has designed a combined support plate structure for transformers through repeated experiments, in order to solve the problems existing in the prior art. Utility Model Content

[0006] The purpose of this invention is to provide a combined support plate structure for a transformer, which can effectively improve the stability of the core and coil.

[0007] To achieve the above objectives, this utility model proposes a combined support plate structure for a transformer. The combined support plate structure includes a core column, a low-voltage coil sleeved on the core column, multiple core binding straps, and at least one support plate assembly. The core binding straps are wound around the core column, and the multiple core binding straps are sequentially spaced along the axial direction of the core column. The support plate assembly is disposed between the low-voltage coil and the core column. The support plate assembly includes a first support plate and a second support plate that are aligned and fitted together. The first support plate is a double-layer structure plate composed of an elastic buffer layer and an insulating and heat-resistant layer. The elastic buffer layer has multiple first grooves, and the core binding straps are aligned and fitted into the first grooves one by one. One surface of the second support plate abuts against the insulating and heat-resistant layer, and the other surface of the second support plate abuts against the low-voltage coil.

[0008] In the combined support plate structure of the transformer described above, the elastic buffer layer is a silicone rubber layer.

[0009] In the combined support plate structure of the transformer described above, the insulating and heat-resistant layer is an epoxy glass cloth board layer.

[0010] In the combined support plate structure of the transformer described above, the insulating heat-resistant layer has a second groove along the axial direction parallel to the core column, one plate surface of the second support plate passes through the second groove, and the other plate surface of the second support plate protrudes from the second groove and abuts against the low-voltage coil.

[0011] In the combined support plate structure of the transformer described above, at least one third groove for air circulation is provided on the other plate surface of the second support plate.

[0012] In the combined support plate structure of the transformer described above, the third groove is arranged in a vertical direction, and the two ends of the third groove respectively penetrate to the upper and lower ends of the second support plate.

[0013] In the combined support plate structure of the transformer described above, the third groove is inclined and its two ends extend to the opposite sides of the second support plate.

[0014] The transformer combined support plate structure described above, wherein the second support plate is an epoxy board support plate.

[0015] In the combined support plate structure of the transformer as described above, the core binding strap is wound around the core post at least 15 times along the circumferential direction of the core post.

[0016] In the combined support plate structure of the transformer described above, the core binding strap is a DMD strap.

[0017] Compared with the prior art, the present invention has the following features and advantages:

[0018] The combined support plate structure of the transformer proposed in this utility model improves the support plate between the core column and the low-voltage coil. Its support plate assembly has a first support plate and a second support plate that are aligned and matched. Through the division of labor and cooperation between the first support plate and the second support plate, it takes into account the functions of fixing, buffering and insulation, and realizes the integration of multiple functions.

[0019] The combined support plate structure of the transformer proposed in this utility model has a first support plate responsible for fixing the binding straps, buffering stress, and providing insulation. Specifically, the iron core binding straps are fitted and fixed by a first groove on the elastic buffer layer, effectively preventing the slippage of the first support plate and the wear of the iron core binding straps. At the same time, the multi-point distributed fixing formed by multiple iron core binding straps on the iron core column effectively ensures the stability of the iron core column. The elastic buffer layer of the first support plate can absorb vibration and deformation stress, reducing material fatigue. The insulating and heat-resistant layer can resist high temperature and electric field erosion, significantly reducing the aging of the first support plate, thereby extending the overall service life of the transformer.

[0020] The combined support plate structure of the transformer proposed in this utility model provides stable physical support for the low-voltage coil and the iron core column with the second support plate, ensuring that the distance between the low-voltage coil and the iron core column is constant. Furthermore, the independent installation or replacement of the support plate assembly is realized through the detachable cooperation between the second support plate and the first support plate, without the need to disassemble the entire coil or iron core, simplifying the maintenance process and reducing operation and maintenance costs. Attached Figure Description

[0021] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0022] Figure 1 This is a schematic diagram of the combined support plate structure of the transformer proposed in this utility model;

[0023] Figure 2 This is a top view of the combined support plate structure in this utility model;

[0024] Figure 3 for Figure 2 A magnified view of a section at point I;

[0025] Figure 4 for Figure 1Enlarged view of section II in the middle;

[0026] Figure 5 This is a front view of the first support plate in this utility model;

[0027] Figure 6 This is a side view of the first support plate in this utility model;

[0028] Figure 7 This is a top view of the first support plate in this utility model;

[0029] Figure 8 This is a side view of the second support plate in this utility model.

[0030] Explanation of reference numerals in the attached figures

[0031] 100. Modular support plate structure; 10. Iron core column;

[0032] 20. Low-voltage coil; 30. Iron core binding strap;

[0033] 40. First support plate; 41. Elastic buffer layer;

[0034] 42. Insulating and heat-resistant layer; 43. First groove;

[0035] 44. Second groove; 50. Second support plate;

[0036] 51. Third groove; 60. High-voltage coil. Detailed Implementation

[0037] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0038] Unless otherwise defined, the directions such as up, down, left, and right mentioned in this document refer to those shown in this utility model. Figure 1 The directions such as up, down, left, and right are used as a reference, and will be explained here together.

[0039] like Figures 1 to 8As shown, this utility model proposes a combined support plate structure 100 for a transformer. The combined support plate structure 100 includes a core column 10, a low-voltage coil 20 sleeved outside the core column 10, multiple core binding straps 30, and at least one support plate assembly. The core binding straps 30 are wound around the core column 10, and the multiple core binding straps 30 are arranged sequentially and at intervals along the axial direction of the core column 10. The support plate assembly is disposed between the low-voltage coil 20 and the core column 10. The support plate assembly includes a first support plate 40 and a second support plate 50 that are aligned and fitted together. The first support plate 40 is a double-layer structure plate composed of an elastic buffer layer 41 and an insulating and heat-resistant layer 42. The elastic buffer layer 41 has multiple first grooves 43. The core binding straps 30 and the first grooves 43 are aligned and fitted together, and the core binding straps 30 are aligned and embedded in the first grooves 43. One surface of the second support plate 50 abuts against the insulating and heat-resistant layer 42, and the other surface of the second support plate 50 abuts against the low-voltage coil 20.

[0040] The combined support plate structure 100 of the transformer proposed in this utility model improves the support plate between the iron core column 10 and the low-voltage coil 20. Its support plate assembly has a first support plate 40 and a second support plate 50 that are aligned and matched. Through the division of labor and cooperation between the first support plate 40 and the second support plate 50, the functions of fixing, buffering and insulation are taken into account, and multi-functional integration is achieved.

[0041] The present invention proposes a combined support plate structure 100 for transformers. The first support plate 40 is responsible for fixing the binding straps, buffering stress, and providing insulation. Specifically, the iron core binding straps 30 are fitted and fixed by the first groove 43 on the elastic buffer layer 41, which effectively prevents the sliding of the first support plate 40 and the wear of the iron core binding straps 30. At the same time, the multi-point distributed fixing formed by multiple iron core binding straps 30 on the iron core column 10 effectively ensures the stability of the iron core column 10. The elastic buffer layer 41 of the first support plate 40 can absorb vibration and deformation stress, reducing material fatigue. The insulating and heat-resistant layer 42 can resist high temperature and electric field erosion, significantly reducing the aging of the first support plate 40, thereby extending the overall service life of the transformer.

[0042] The present invention proposes a combined support plate structure 100 for transformers. The second support plate 50 provides stable physical support for the low-voltage coil 20 and the iron core column 10, ensuring that the distance between the low-voltage coil 20 and the iron core column 10 is constant. Furthermore, through the detachable cooperation between the second support plate 50 and the first support plate 40, the support plate assembly can be installed or replaced independently without disassembling the entire coil or iron core, simplifying the maintenance process and reducing operation and maintenance costs.

[0043] In one optional embodiment of the present invention, the elastic buffer layer 41 is a silicone rubber layer, which can provide elastic buffering for the first support plate 40.

[0044] In one optional embodiment of this utility model, the insulating and heat-resistant layer 42 is an epoxy glass cloth board layer, which provides support and insulation protection for the first support plate 40.

[0045] In an optional embodiment of this invention, a second groove 44 is formed in the insulating and heat-resistant layer 42 along the axis parallel to the core column 10. One surface of the second support plate 50 passes through the second groove 44, and the other surface of the second support plate 50 protrudes from the second groove 44 and abuts against the low-voltage coil 20. The second groove 44 serves to position the second support plate 50, preventing it from shifting during installation and avoiding changes in the force-bearing position of the second support plate 50.

[0046] In an optional embodiment of the present invention, at least one third groove 51 for air circulation is provided on the other side of the second support plate 50 (which abuts against the low-voltage coil 20), so that the cooling airflow can flow along the second support plate 50, effectively reducing the surface temperature of the low-voltage coil and avoiding insulation aging caused by local overheating.

[0047] In an optional example of this embodiment, the third groove 51 is arranged in a vertical direction, and the two ends of the third groove 51 extend to the upper and lower ends of the second support plate 50, respectively.

[0048] In an optional example, the second support plate 50 has multiple third grooves 51 arranged sequentially at fixed intervals.

[0049] In another alternative example of this implementation, such as Figure 8 As shown, the third groove 51 is inclined, and its two ends extend to the opposite sides of the second support plate 50. With this structure, a directional airflow channel is formed through the third groove 51 without affecting the strength of the second support plate 50, thereby increasing the cooling air velocity, effectively reducing the surface temperature of the low-voltage coil, and preventing insulation aging caused by localized overheating.

[0050] In an optional example, the third groove 51 has a width of 3 mm and a depth of 3 mm.

[0051] In an optional example, the third groove 51 is tilted at an angle of 45 degrees relative to the horizontal plane.

[0052] In an optional example, the second support plate 50 has multiple third grooves 51 arranged sequentially at fixed intervals.

[0053] In one optional embodiment of this utility model, the second support plate 50 is an epoxy board support plate, which has both insulation and supporting strength.

[0054] In an optional example of this embodiment, the lower end of the second support plate 50 adopts a wedge-shaped structure with gradually decreasing thickness. The inclined surface design can effectively reduce assembly resistance and effectively avoid shear stress damage to the casting layer of the low-voltage coil 20 during the embedding process of the second support plate 50.

[0055] Furthermore, the lower edge of the second support plate 50 has a rounded corner with a radius R of 1 mm.

[0056] In one optional embodiment of the present invention, the width of the second support plate 50 is one-third of the total width of the widest silicon steel sheet (intermediate layer) among the stacked silicon steel sheets of the core column 10.

[0057] In one optional embodiment of the present invention, the core binding strap 30 is wound around the core post 10 at least 15 times along the circumferential direction of the core post 10.

[0058] In one optional embodiment of this invention, the core binding strap 30 is a DMD strap. The DMD strap has a three-layer composite structure consisting of a polyester film, a polyester fiber nonwoven fabric, and a polyester film, which can provide excellent electrical insulation performance to prevent multi-point grounding faults in the core and enhance the mechanical strength of the core column.

[0059] Furthermore, the core binding tape 30 has a thickness of 0.2 mm. The ultra-thin thickness of 0.2 mm makes the surface electric field distribution of the core column 10 more uniform and reduces eddy current loss. In addition, the tensile strength of the DMD tape is ≥120 MPa, which reduces the radial deformation of the core column by 40-60%.

[0060] In another optional embodiment of this utility model, the iron core binding strap 30 is a glass fiber adhesive tape.

[0061] In an optional embodiment of this invention, two support plate assemblies are provided between the core column 10 and the low-voltage coil 20, and the two support plate assemblies are respectively provided on opposite sides of the main stage of the core column 10.

[0062] In an optional embodiment of this invention, three support plate assemblies are provided between the core column 10 and the low-voltage coil 20, wherein two support plate assemblies are respectively provided on opposite sides of the widest silicon steel sheet of the core column 10, and the other support plate assembly is provided on the side of the narrowest silicon steel sheet facing the low-voltage coil.

[0063] Please refer to Figures 1 to 6 The assembly process of the combined support plate structure 100 for the transformer proposed in this utility model is as follows:

[0064] First, wrap the iron core binding tape 30 around the iron core column 10 15 times at a certain interval. Then, align the first groove 43 of the first support plate 40 with the iron core column 10 that has been wrapped with the iron core binding tape 30, and temporarily fix it with glass glue.

[0065] Insert the high-voltage coil 60 and the low-voltage coil 20, and then insert the second support plate 50 to tighten the low-voltage coil and the iron core.

[0066] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. A combined support plate structure for a transformer, characterized in that, The combined support plate structure includes an iron core column, a low-voltage coil sleeved on the iron core column, multiple iron core binding straps, and at least one support plate assembly. The iron core binding straps are wound around the iron core column, and the multiple iron core binding straps are arranged sequentially and at intervals along the axial direction of the iron core column. The support plate assembly is disposed between the low-voltage coil and the iron core column. The support plate assembly includes a first support plate and a second support plate that are aligned and fitted together. The first support plate is a double-layer structure plate composed of an elastic buffer layer and an insulating and heat-resistant layer. The elastic buffer layer has multiple first grooves. The iron core binding straps are aligned and fitted into the first grooves one by one. One surface of the second support plate abuts against the insulating and heat-resistant layer, and the other surface of the second support plate abuts against the low-voltage coil.

2. The combined support plate structure of the transformer as described in claim 1, characterized in that, The elastic buffer layer is a silicone rubber layer.

3. The combined support plate structure of the transformer as described in claim 1, characterized in that, The insulating and heat-resistant layer is an epoxy glass cloth board layer.

4. The combined support plate structure of the transformer as described in claim 1, characterized in that, Along the axial direction parallel to the core column, the insulating heat-resistant layer has a second groove, one surface of the second support plate passes through the second groove, and the other surface of the second support plate protrudes from the second groove and abuts against the low-voltage coil.

5. The combined support plate structure of the transformer as described in claim 1, characterized in that, At least one third groove for air circulation is provided on the other surface of the second support plate.

6. The combined support plate structure of the transformer as described in claim 5, characterized in that, The third groove is arranged vertically, and its two ends extend through the upper and lower ends of the second support plate, respectively.

7. The combined support plate structure of the transformer as described in claim 5, characterized in that, The third groove is inclined, and its two ends extend through to the opposite sides of the second support plate.

8. The combined support plate structure of the transformer as described in claim 1, characterized in that, The second support plate is an epoxy board support plate.

9. The combined support plate structure of the transformer as described in claim 1, characterized in that, The core binding strap is wrapped around the core post at least 15 times along the circumference of the core post.

10. The combined support plate structure of the transformer as described in claim 1, characterized in that, The core binding strap is a DMD strap.

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