Coil bobbin fixing device

Abstract

The utility model belongs to the electrical insulation field, concretely relates to a coil insulation cylinder fixing device, including the backplate of a plurality of of installing on the both ends of low pressure coil and the positioning structure of setting on the backplate, the positioning structure includes a plurality of limit block that stacks in proper order, the limit block of more close to the backplate is bigger in size, is provided with the limit block between adjacent limit block, the size of limit block is consistent with the adjacent limit block of the side far from the backplate, the top height of limit block is lower than adjacent limit block, and the position of limit block does not exceed the range of adjacent limit block of the side close to the backplate. The utility model fixing device is circumferentially provided with a plurality of fixed points, improves the resistance vibration displacement capacity, ensures the insulation cylinder shape and insulation distance, the installation hole of positioning structure and insulation cylinder realizes zero gap cooperation, improves the stability of insulation cylinder and the electrical safety of dry change, simple structure, convenient assembly, the multistage limit block of positioning structure adapts the insulation distance adjustment in a certain range.

Description

Technical Field

[0001] This utility model belongs to the field of electrical insulation, and specifically relates to a coil insulation cylinder fixing device. Background Technology

[0002] Coil insulation cylinders are critical insulation components in power equipment such as transformers and reactors. Their core function is to construct the main insulation barrier between the high-voltage and low-voltage coils, ensuring the safe and stable operation of the equipment. Therefore, the structural fixation of the coil insulation cylinder is extremely important. If the fixation fails, it will cause displacement or deformation of the insulation cylinder, directly changing the main insulation distance between the high-voltage and low-voltage coils, causing distortion of the electric field distribution, and increasing the risk of partial discharge.

[0003] like Figure 1 As shown, the traditional insulating cylinder is fixed by four insulating pads with limiting grooves above and below the coil, which has the following significant defects: 1. Few fixing points: Insufficient circumferential support makes the insulating cylinder prone to deformation, and the insulation distance fluctuates greatly, affecting electrical safety; 2. Poor reliability: During the transportation or operation of the transformer, the insulating cylinder is prone to loosening or displacement due to vibration and other reasons; 3. Not adjustable: The height and position of the insulating cylinder are fixed and cannot be adapted to different specifications. Utility Model Content

[0004] The present invention aims to solve the above problems by providing a coil insulation cylinder fixing device, which can effectively solve the problems of easy displacement, poor heat dissipation and inefficient assembly of traditional insulation cylinder fixing structures.

[0005] According to the technical solution of this utility model, the coil insulation cylinder fixing device includes several back plates installed at the upper and lower ends of the low voltage coil and a positioning structure set on the back plates. The positioning structure includes several limit blocks stacked sequentially, with the limit blocks closer to the back plate being larger in size; a positioning block is provided between adjacent limit blocks, the size of the positioning block being the same as the adjacent limit block on the side away from the back plate, the top height of the positioning block being lower than the adjacent limit block, and the position of the positioning block not exceeding the range of the adjacent limit block on the side closer to the back plate.

[0006] Furthermore, 6-8 back plates are installed at both the upper and lower ends of the low-voltage coil, distributed along the straight section around the low-voltage coil.

[0007] Furthermore, the back plates at the upper and lower ends of the low-voltage coil are respectively provided.

[0008] Furthermore, the backplate is mounted on the low-voltage coil by adhesive bonding.

[0009] Furthermore, the back plate is provided with a boss, the upper or lower end face of which is flush with the corresponding end face of the back plate.

[0010] Furthermore, it also includes a winding tape for wrapping the back plate around designated positions at the upper and lower ends of the low-voltage coil.

[0011] Furthermore, the top heights of the plurality of limiting blocks are consistent, and the top heights of the positioning blocks are consistent.

[0012] Furthermore, the center lines of the limiting block and the positioning block are located in the same vertical plane.

[0013] The technical solution of this utility model has the following advantages compared with the prior art: 1. Improved stability: Multiple fixed points are set in the circumference, which improves the ability to resist vibration and displacement, and ensures the shape of the insulating cylinder and the insulation distance; 2. Insulation protection: The positioning structure and the mounting holes of the insulating cylinder achieve a zero-gap fit, which improves the stability of the insulating cylinder and the electrical safety of the dry-type transformer; 3. Highly efficient assembly: The simple structure and convenient assembly shorten the installation time and improve assembly efficiency. 4. High versatility: The multi-level positioning blocks of the positioning structure are adapted to adjust the insulation distance within a certain range. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the fixing of a traditional insulating cylinder.

[0015] Figure 2 This is a schematic diagram of the installation of the coil insulation cylinder fixing device of this utility model.

[0016] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle.

[0017] Figure 4 This is a schematic diagram of the insulating cylinder installation process.

[0018] Figure 5 This is a schematic diagram of the assembly of the insulating cylinder.

[0019] Explanation of reference numerals in the attached diagram: 1-back plate, 2-limiting block, 3-positioning block, 4-protrusion, 5-winding tape, 6-low voltage coil, 7-insulating cylinder. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0021] Due to the problems of limited fixing points, easy displacement, and lack of adjustability in traditional insulating cylinder fixing structures, this utility model provides a multi-point, adjustable, and highly stable insulating cylinder fixing solution.

[0022] like Figure 2-3 As shown, the coil insulation tube fixing device of this utility model includes several back plates 1 installed at the upper and lower ends of a low-voltage coil 6, and positioning structures disposed on the back plates 1. The circumferential multi-point fixing improves the resistance to vibration and displacement. Specifically, the back plates 1 have a first surface and a second surface that are parallel to each other. The first surface is connected to the surface of the low-voltage coil 6, for example, by adhesive bonding, thereby mounting the back plates 1 onto the low-voltage coil 6; the positioning structures are disposed on the second surface. Preferably, the first and second surfaces are rectangular, that is, the back plates 1 are rectangular plate structures, and the positioning structures are disposed at one end of the rectangle; to facilitate the installation of the insulation tube, the positioning structures on the back plates 1 at the upper and lower ends of the low-voltage coil 6 are at the same height.

[0023] In some preferred embodiments, 6-8 back plates 1 (6 are shown in the illustration, but the back portion is not shown due to viewing angle) are installed at both the upper and lower ends of the low-voltage coil 6, distributed along the straight section circumferentially of the low-voltage coil 6. It can be imagined that the low-voltage coil 6 circumferentially includes a straight section and an arc-shaped section, forming a shape similar to an elongated ellipse. In the straight section, the insulating cylinder is fixed using the positioning structure on the back plate 1. After determining the insulation distance, the arc-shaped section can utilize the natural curvature of the insulating cylinder to confirm the insulation distance. Therefore, while ensuring the shape of the insulating cylinder and the insulation distance, the fixing device for the arc-shaped section can be omitted, thereby saving costs. Preferably, the back plates 1 at the upper and lower ends of the low-voltage coil 6 are arranged in a one-to-one correspondence, providing a certain vertical support and tension. The back plates 1 at the upper and lower ends can also be staggered to ensure stable fixation of the insulating cylinder.

[0024] A boss 4 can also be provided on the back plate 1. The boss 4 and the positioning structure can be located at the upper and lower ends of the back plate 1, respectively. The upper or lower end face of the boss 4 is flush with the corresponding end face of the back plate 1. Specifically, for the back plate 1 at the upper end of the low-voltage coil 6, the boss 4 is located at the upper end of the back plate 1, and the upper end face of the boss 4 is flush with the upper end face of the back plate 1; for the back plate 1 at the lower end of the low-voltage coil 6, the boss 4 is located at the lower end of the back plate 1, and the lower end face of the boss 4 is flush with the lower end face of the back plate 1. When the back plate 1 is installed, its end face is flush with the end face of the low-voltage coil 6, and the boss 4 plays a positioning role, which can quickly confirm the installation position and angle of the back plate 1. After the back plate 1 is installed, it can be further wound around the low-voltage coil 6 using the winding tape 5. At this time, the boss 4 can also be used to limit the winding tape 5.

[0025] like Figure 3 and 4As shown, the positioning structure includes several limit blocks 2 stacked sequentially. The limit blocks 2 closer to the back plate 1 have larger dimensions (cross-sectional dimensions). The thickness of the limit blocks 2 can be designed according to the differences in insulation distance; for example, the thickness of the limit block 2 closest to the back plate 1 is designed based on the minimum insulation distance. Positioning blocks 3 are provided between adjacent limit blocks 2, that is, limit blocks 2 and positioning blocks 3 are stacked alternately, with the edge blocks being limit blocks 2. The dimensions of the positioning blocks 3 are the same as those of the adjacent limit blocks 2 on the side away from the back plate 1. The top height of the positioning block 3 is lower than that of the adjacent limit blocks 2, and the position of the positioning block 3 does not exceed the range of the adjacent limit blocks 2 on the side closer to the back plate 1.

[0026] In some preferred embodiments, the top heights of the plurality of limiting blocks 2 are consistent, and the top heights of the plurality of positioning blocks 3 are consistent, making the positioning structure more regular. Simultaneously, the center lines of the limiting blocks 2 and the positioning blocks 3 can also be located in the same vertical plane. For example, when both the limiting blocks 2 and the positioning blocks 3 are flat cylindrical structures, their axes are located in the same vertical plane, forming a positioning structure as follows: Figure 3 Or as shown in Figure 4. Figure 3 Alternatively, in option 4, there are 4 limit blocks 2 and 4 positioning blocks 3, which can accommodate 3 levels of insulation distance; to accommodate a wider range of insulation distance adjustment, there can be more levels of positioning structure, that is, more limit blocks 2 and positioning blocks 3 can be set.

[0027] It is conceivable that the top heights of the limiting blocks 2 can be inconsistent, and the positions of the positioning blocks 3 between the limiting blocks 2 can also be offset, as long as the positioning holes on the insulating cylinder can smoothly pass through the limiting blocks 2 of the corresponding size and fall into the position of the positioning block 3, and be blocked by the next-level limiting block 2 (the adjacent limiting block 2 that falls into the positioning block 3 on the side closer to the back plate 1). Similarly, the limiting blocks 2 and positioning blocks 3 can also adopt other shapes, such as flat elliptical cylinders, as long as the corresponding shape of the positioning holes is opened on the insulating cylinder.

[0028] like Figure 4 and 5 As shown, when assembling the insulating cylinder using the fixing device of this utility model, the following steps can be adopted: 1. Wrapping the high-voltage coil: Wrap the high-voltage coil (located outside the insulating cylinder 7, not shown in the figure) inside the iron core column (located inside the low-voltage coil 6, not shown in the figure); 2. Install the fixing device of this utility model: Apply adhesive to the first surface of the back plate 1 and attach it to the designated positions at the upper and lower ends of the low voltage coil 6, and then use the winding tape 5 to wrap and fix it. 3. Install the insulating cylinder 7: According to the insulation distance, make positioning holes on the insulating cylinder 7 that match the size of the positioning structure; during installation, the insulating cylinder 2 passes through the outer limiting block 2 and the positioning block 3 in sequence. After the insulating cylinder 7 moves above the limiting block 2 of the appropriate size, the insulating cylinder 7 is smoothly placed into the positioning block 3 so that it can be precisely matched with the corresponding positioning block 3, ensuring that it is constrained by the next level limiting block 2 and ensuring the reliability of the fixed insulating cylinder 7. 4. Wrap the low-voltage coil 6 and the insulating cylinder 7 together and wrap them on the core column of the existing high-voltage coil to complete the assembly.

[0029] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A coil insulation cylinder fixing device, characterized in that, It includes several back plates (1) installed at the upper and lower ends of the low-voltage coil (6) and a positioning structure set on the back plates (1); The positioning structure includes a number of limit blocks (2) stacked in sequence. The limit blocks (2) closer to the back plate (1) are larger in size. A positioning block (3) is provided between adjacent limit blocks (2). The size of the positioning block (3) is the same as that of the adjacent limit block (2) on the side away from the back plate (1). The top height of the positioning block (3) is lower than that of the adjacent limit block (2), and the position of the positioning block (3) does not exceed the range of the adjacent limit block (2) on the side closer to the back plate (1).

2. The coil insulation cylinder fixing device as described in claim 1, characterized in that, The low-voltage coil (6) has 6-8 back plates (1) installed at both the upper and lower ends, distributed in the straight section around the low-voltage coil (6).

3. The coil insulation tube fixing device as described in claim 1 or 2, characterized in that, The back plates (1) at the upper and lower ends of the low-voltage coil (6) are set one-to-one.

4. The coil insulation cylinder fixing device as described in claim 1, characterized in that, The backplate (1) is mounted on the low-voltage coil (6) by adhesive.

5. The coil insulation cylinder fixing device as described in claim 1, characterized in that, The back plate (1) is provided with a boss (4), the upper or lower end face of the boss (4) is flush with the corresponding end face of the back plate (1).

6. The coil insulation tube fixing device as described in claim 1, 4, or 5, characterized in that, It also includes a winding tape (5) for winding the back plate (1) around the designated positions at the upper and lower ends of the low-voltage coil (6).

7. The coil insulation cylinder fixing device as described in claim 1, characterized in that, The top heights of the plurality of limiting blocks (2) are consistent, and the top heights of the positioning blocks (3) are consistent.

8. The coil insulation tube fixing device as described in claim 1 or 7, characterized in that, The center lines of the limiting block (2) and the positioning block (3) are located in the same vertical plane.

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