A transformer body clamping structure

Abstract

This utility model relates to a transformer body clamping structure, belonging to the field of transformer manufacturing technology. It includes a transformer body main body, comprising a core, coils on the outer side of the core, and core clamping components. The distributed clamping structure includes side yoke pads, a central yoke pad, and a central insulating pressure plate assembly. The distributed clamping structure is used to axially clamp the coils, and the side yoke pads, central yoke pads, and central insulating pressure plate assembly are all located between the core clamping components and the coils. The side clamping protection structure includes side channel steel, a side insulating pressure plate assembly, and coil pressing support strips. This utility model, through the distributed clamping structure and the side clamping protection structure, improves the heat dissipation capacity of the internal structure of the transformer body, reduces the risk of deformation of the internal structure during sudden short circuits, and significantly improves the transformer's short-circuit withstand capability.

Description

Technical Field

[0001] This utility model relates to the field of transformer manufacturing technology, specifically to a transformer body clamping structure. Background Technology

[0002] Transformers play an extremely important role in the field of power transmission. In the field of transformer manufacturing technology, the elongated oval core and coil structure can significantly reduce the manufacturing cost of transformers. However, the cross-section of this structure is elongated oval, and it is difficult to wind the straight part of the winding tightly, resulting in gaps in the radial direction, which in turn leads to a decrease in the transformer's short-circuit withstand capability.

[0003] Existing technologies for improving short-circuit withstand capability are not only complex and costly in terms of operation, but also fail to consider the transformer's heat dissipation capacity. Simply adding axial or radial clamping to the transformer body at different locations improves the transformer's short-circuit withstand capability to some extent, but sacrifices heat dissipation capacity, creating certain potential hazards. Utility Model Content

[0004] This utility model aims to solve the above-mentioned technical problems by providing a transformer body clamping structure.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A transformer body clamping structure, including

[0007] The main body of the device includes an iron core, coils outside the iron core, and iron core clamps;

[0008] A distributed clamping structure, comprising a side yoke pad, a middle yoke pad, and a middle insulating pressure plate assembly, wherein the distributed clamping structure is used to axially clamp the coil, and the side yoke pad, the middle yoke pad, and the middle insulating pressure plate assembly are all located between the core clamp and the coil;

[0009] The side-clamping protection structure includes a side channel steel, a side insulating pressure plate assembly, and a coil pressing support curtain. The coil pressing support curtain is located on both sides of the straight portion of the coil. The side insulating pressure plate assembly is located between the coil pressing support curtain and the side channel steel. The side channel steel is fixed to the core clamp by an L-shaped steel.

[0010] Preferably, the central insulating pressure plate assembly includes a central insulating pressure plate and central insulating pads, wherein the central insulating pads are evenly arranged on the central insulating pressure plate in a straight line and a circular array.

[0011] Preferably, the side yoke pad and the middle yoke pad are a combination structure of a base plate and multiple sets of wooden strips on the base plate. The wooden strips are arranged in a straight array and form oil flow channels between them. The oil flow channels connect the iron core and the outer side of the main body of the vessel.

[0012] Preferably, the side yoke pads are rectangular and the central yoke pads are trapezoidal.

[0013] Preferably, the side insulation pressure plate assembly includes a side insulation paperboard and a side insulation pressure block, the side insulation pressure block being horizontally bonded to the side insulation paperboard, and the side insulation pressure block being perpendicular to the long side direction of the coil pressing support strip curtain.

[0014] Preferably, a side channel steel reinforcing plate is welded to the inner side of the side channel steel, and oblong through holes are opened at the upper and lower ends of the side channel steel and the side insulating paperboard. The oblong through holes are opposite to the through holes of the L-shaped steel and the straight part is perpendicular to them.

[0015] Preferably, the L-shaped steel is welded to both sides of the core clamp, and a triangular L-shaped steel reinforcing plate is welded on the L-shaped steel. The side of the L-shaped steel facing the side pressing and protective structure has a through hole, and the L-shaped steel reinforcing plate is welded to the non-bent side of the side where the through hole is located.

[0016] With the above structure, this utility model has the following advantages:

[0017] This utility model improves the heat dissipation capacity of the internal structure of the transformer body through a distributed compression structure and a side compression protection structure, reduces the risk of deformation of the internal structure of the transformer body during sudden short circuits, and significantly improves the short circuit resistance of the transformer.

[0018] Both structures simultaneously compress the coil in the axial and radial directions, reducing the risk of deformation of the internal structure of the transformer body during sudden short circuits and significantly improving the transformer's short-circuit withstand capability; effectively preventing short circuit problems caused by loose wires or insufficient compression, as well as technical problems such as temperature rise inside the transformer body.

[0019] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a top view of this application;

[0022] Figure 2 This is the front view of this application;

[0023] Figure 3 This is a side view of this application;

[0024] Figure 4 This is a schematic diagram of the distribution and structure of the pad blocks in the distributed compression structure of this application;

[0025] Figure 5 This is a structural schematic diagram of the central insulating pressure plate assembly of this application;

[0026] Figure 6 This is a structural schematic diagram of the side channel steel assembly of this application;

[0027] Figure 7 This is a schematic diagram of the side insulating pressure plate assembly of this application;

[0028] Figure 8 This is a structural schematic diagram of the L-shaped steel assembly of this application.

[0029] As shown in the figure: 1. Iron core; 2. Coil; 3. Iron core clamp; 4. Side yoke pad; 5. Middle yoke pad; 6. Middle insulation pressure plate assembly; 7. Middle insulation pressure plate; 8. Middle insulation pad; 9. Side channel steel; 10. Side channel steel reinforcing plate; 11. Side insulation pressure plate assembly; 12. Insulating paperboard; 13. Side insulation pressure block; 14. Coil pressing support curtain; 15. L-shaped steel; 16. L-shaped steel reinforcing plate. Detailed Implementation

[0030] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] The present invention will now be described in further detail in conjunction with the full text.

[0033] Combined with appendix Figures 1-8 A short-circuit resistant transformer body clamping structure, comprising:

[0034] The main body of the transformer includes the core 1, the coil 2, and the core clamp 3, which are the basic components of the transformer body. Specifically, the coil 2 is fitted on the outside of the core 1, and the upper and lower ends of the coil (3) are respectively equipped with side clamping protection structures. It is clamped by the core clamp 3.

[0035] The distributed clamping structure includes a side yoke pad 4, a middle yoke pad 5, and a middle insulating pressure plate assembly 6. The distributed clamping structure is used to axially clamp the coil 2, and the side yoke pad 4, the middle yoke pad 5, and the middle insulating pressure plate assembly 6 are all located between the core clamp 3 and the coil 2.

[0036] In a specific implementation, the side-clamping protection structure of this utility model includes a side channel steel 9, a side insulating pressure plate assembly 11, and a coil pressing support curtain 14. The coil pressing support curtain 14 is located on both sides of the straight portion of the coil 2. The side insulating pressure plate assembly 11 is located between the coil pressing support curtain 14 and the side channel steel 9. The side channel steel 9 is fixed to the core clamp 3 by L-shaped steel 15. The distributed clamping structure is located between the upper and lower ends of each coil and the upper and lower clamps of the core. The arrangement can be referred to... Figure 4 The side yoke pad 4 is located between the upper and lower sides of the side coil and the upper and lower clamping parts of the core. The middle insulating pressure plate assembly 6 is located between the upper and lower ends of the two adjacent coils and the upper and lower clamping parts of the core. The middle insulating pad 8 is evenly arranged on the middle insulating pressure plate 7 in a straight line and a circular array. The specific arrangement can be found in the following reference. Figure 5 The distributed clamping structure uses individual pads arranged in a composite array of straight lines and circles, ensuring axial clamping while maintaining a larger oil flow space. Among them, the side 4 yoke pads, the middle yoke pads 5, and the middle insulating pressure plate assembly 6 are all located between the core clamp 3 and the coil 2 for axial clamping.

[0037] The central insulating pressure plate assembly 6 includes a central insulating pressure plate 7 and a central insulating pad 8. The central insulating pad 8 is evenly arranged on the central insulating pressure plate 7 in a straight line and a circular array.

[0038] The side yoke pad 4 and the middle yoke pad 5 are a combination structure of base plate and wooden strips. The wooden strips are arranged in a straight array and form an oil flow channel between them. The oil flow channel connects the iron core 1 and the outside of the body.

[0039] The side yoke pad 4 is a rectangular structure, arranged in a composite array of straight lines and circles on the upper and lower sides of the coil 2; the middle yoke pad 5 is a trapezoidal structure, placed at an angle to the outer circle of the iron core and with the cut direction parallel to the iron core clamp 3, arranged in a composite array of straight lines and circles on the upper and lower sides of the adjacent positions of the two coils.

[0040] The side insulation pressure plate assembly 11 includes a side insulation paperboard 12 and a side insulation pressure block 13. The side insulation pressure block 13 is horizontally bonded to the side insulation paperboard 12, and an oil flow channel is left between the side insulation pressure blocks 13. The side insulation pressure block 13 is perpendicular to the long side direction of the coil pressing support strip curtain 14.

[0041] The coil pressing support curtain 14 is composed of cardboard and wooden support strips. The wooden support strips are installed perpendicular to the winding direction of the coil 2 wires, and heat dissipation oil channels are left between the wooden support strips. The side channel steel 9 is welded with a side channel steel reinforcing plate 10. The side channel steel 9 and the side insulating cardboard 12 have oblong through holes at the top and bottom. The oblong through holes are opposite to the through holes of the L-shaped steel 15 and the straight part is perpendicular to them.

[0042] In a specific implementation of this invention, the side-clamping protection structure is located outside the side coil of the three-phase three-column transformer, used for side-clamping protection of the coil. The coil clamping support curtain 14 is bonded to the outermost conductors of the straight sections on both sides of the coil 2, serving as transition protection and heat dissipation for the side channel steel 9 and the side insulation pressure plate assembly 11 clamping the coil. It should be noted that the side coil clamping support curtain is in direct contact with the side insulation pressure plate assembly 11, and the clamping support curtains of adjacent coils are isolated from each other by phase-separated wooden partitions. The side insulation pressure block 13 in the side insulation pressure plate assembly 11 is horizontally bonded to the side insulation cardboard 12, and its arrangement can be referred to... Figure 7 Oil flow channels are provided between the side insulating pressure blocks 13 for oil flow and heat dissipation. The side insulating pressure blocks 13 are perpendicular to the long side of the coil pressing support curtain 14, which can improve the firmness of coil pressing. The side plate channel steel 9 is located on the outside of the side insulating pressure plate assembly 11 and is fixed to the clamp by L-shaped steel 15 welded to the clamp. It is used to apply pressing force to the side of the coil and play a role in pressing and protection.

[0043] L-shaped steel 15 is welded to both sides of the core clamp 3, and triangular L-shaped steel reinforcing plates 16 are welded on L-shaped steel 15. The side of L-shaped steel 15 facing the side pressing protective structure has an elongated through hole, and L-shaped steel reinforcing plates 16 are welded to the non-bent side of the side where the through hole is located.

[0044] The transformer body provided in this application improves internal heat dissipation through a distributed clamping structure, enhancing the force distribution at various points during axial clamping. This structure ensures uniform clamping force across the coil during axial clamping, resulting in a more robust coil and extended service life. The side clamping protection structure provides clamping force from the sides, facilitating operation and effectively clamping the conductors radially within the coil, thus significantly improving the transformer's short-circuit withstand capability and heat dissipation. Both structures provide simultaneous axial and radial clamping, and the optimized distributed structure further increases the heat dissipation area, reducing potential hazards caused by poor internal coil heat dissipation and effectively preventing short circuits due to loose conductors or insufficient clamping.

[0045] In this embodiment, the side yoke pads 4 and the central yoke pads 5 of the distributed compression structure are a combined structure, composed of a base plate and wooden strips. The wooden strips are arranged in a linear array, with oil flow channels between the strips. The cross-sectional structure of the yoke pads is as follows: Figure 4 As shown in the circled area, the oil flow channel runs directly from the core to the outside of the vessel body, which can effectively improve the heat dissipation capacity inside the vessel body.

[0046] Specifically, the side yoke pads 4 are rectangular in structure and are evenly arranged on the upper and lower sides of the side coils in a composite array of straight lines and circles. The central yoke pads 5 are trapezoidal in structure and are cut obliquely from the rectangular pads. The central yoke pads 5 are placed at a certain angle to the circumcircle of the core, and the cut direction is parallel to the direction of the clamping parts. The central yoke pads 5 are evenly arranged on the upper and lower sides of adjacent positions of the coils in a composite array of straight lines and circles. The distributed arrangement of the yoke pads provides a larger heat dissipation space and a larger heat dissipation channel between the pads, which can further increase the oil flow, quickly and effectively reduce the internal temperature of the transformer, and prevent the accumulation of heat inside the coils.

[0047] Specifically, the coil pressing support curtain 14 is composed of cardboard and wooden support strips. The installation direction of the support strips is perpendicular to the winding direction of the conductor, and heat dissipation oil channels are left between the support strips. Sufficient heat dissipation space is provided while ensuring lateral compression. The insulating blocks are evenly arranged on the insulating pressure plate, with the arrangement direction perpendicular to the placement direction of the support strips, and oil flow channels are left between each insulating block. The side channel steel 9 is tightly attached to the side insulating pressure plate assembly 11 and is fixed to the L-shaped steel 15 welded to the core clamp by bolts.

[0048] Specifically, a rectangular reinforcing plate 10 is welded to the inner side of the side channel steel 9, and its placement can be referenced. Figure 6This is to enhance the strength of the channel steel. Oblong through holes are provided on both the upper and lower sides of the side channel steel 9 and the insulating pressure plate 12 for connection and fixation with the L-shaped steel 15. The oblong through holes are respectively positioned opposite to the through holes of the L-shaped steel 15 of the high-voltage upper and lower clamps and the low-voltage upper and lower clamps, but the straight sections of the oblong through holes are perpendicular to each other to ensure sufficient installation margin.

[0049] Specifically, the L-shaped steel 15 is fixed to both sides of each clamp by welding. A triangular reinforcing plate 16 is welded onto the L-shaped steel 15. It is worth noting that the L-shaped steel 15 has two elongated through holes on the side facing the side clamping protection device. The triangular reinforcing plate 16 is welded to the side of the through hole on the non-bent side. The U-shaped end face formed is welded to the iron core clamp and is used to connect with the side clamping protection device.

[0050] The present invention and its embodiments have been described above. This description is not restrictive, and the embodiments shown throughout the text are only one of the embodiments of the present invention. The actual structure is not limited to this. In conclusion, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A transformer body clamping structure, characterized in that, include The main body of the device includes an iron core (1), a coil (2) outside the iron core (1), and an iron core clamp (3); A distributed clamping structure is provided, comprising a side yoke pad (4), a middle yoke pad (5), and a middle insulating pressure plate assembly (6). The distributed clamping structure is used to axially clamp the coil (2), and the side yoke pad (4), the middle yoke pad (5), and the middle insulating pressure plate assembly (6) are all located between the core clamp (3) and the coil (2). The side-clamping protection structure includes a side channel steel (9), a side insulating pressure plate assembly (11), and a coil pressing support curtain (14). The coil pressing support curtain (14) is located on both sides of the straight part of the coil (2). The side insulating pressure plate assembly (11) is located between the coil pressing support curtain (14) and the side channel steel (9). The side channel steel (9) is fixed to the core clamp (3) by an L-shaped steel (15).

2. The transformer core pressing structure according to claim 1, wherein: The central insulating pressure plate assembly (6) includes a central insulating pressure plate (7) and a central insulating pad (8), wherein the central insulating pad (8) is evenly arranged on the central insulating pressure plate (7) in a straight line and a circular array.

3. The transformer core compression structure of claim 1, wherein: The side yoke pad (4) and the middle yoke pad (5) are a combination structure of multiple sets of wooden strips on the bottom plate and the bottom plate. The wooden strips are arranged in a straight array and form an oil flow channel between them. The oil flow channel connects the iron core (1) and the outer side of the main body of the vessel.

4. The transformer core compression structure of claim 1, wherein: The side yoke pad (4) has a rectangular structure, and the middle yoke pad (5) has a trapezoidal structure.

5. The transformer core compression structure of claim 1, wherein: The side insulation plate assembly (11) includes a side insulation paperboard (12) and a side insulation block (13). The side insulation block (13) is horizontally bonded to the side insulation paperboard (12). The side insulation block (13) is perpendicular to the long side of the coil pressing support strip curtain (14).

6. The transformer core pressing structure according to claim 5, wherein The side channel steel (9) is welded with a side channel steel reinforcing plate (10) on its inner side. The side channel steel (9) and the side insulating paperboard (12) have elongated oval through holes at their upper and lower ends. The elongated oval through holes are opposite to the through holes of the L-shaped steel (15) and the straight part is perpendicular to them.

7. The transformer core pressing structure according to claim 6, wherein L-shaped steel (15) is welded to both sides of the core clamp (3), and a triangular L-shaped steel reinforcing plate (16) is welded on the L-shaped steel (15). The L-shaped steel (15) has a through hole on the side facing the side pressing the protective structure. The L-shaped steel reinforcing plate (16) is welded to the non-bent side of the side where the through hole is located.

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