Winding system for CVT capacitive divider

Abstract

The utility model provides a CVT capacitor voltage divider's winding system, first capacitor paper roll, first lower isolation membrane roll, first aluminium foil roll laminated and form first aluminium foil membrane group, through first pass axle winding on capacitor winding shaft, first upper isolation membrane roll, second capacitor paper roll, second lower isolation membrane roll, second aluminium foil roll laminated and form second aluminium foil membrane group, through second pass axle winding on capacitor winding shaft, first upper isolation membrane roll passes through the pressure effect of the counter-pressure roller and winds on capacitor winding shaft to make second upper isolation membrane can exert winding force to first aluminium foil membrane group of first pass axle, second aluminium foil membrane group of second pass axle. The utility model provides a CVT capacitor voltage divider's winding system, can make the capacitor roll obtain better tightening force through the laminating mode of second upper isolation membrane to two aluminium foil membrane groups, and two aluminium foil membrane groups do not need to bear the effect of excessive tension, thereby making the deformed capacitor voltage divider after winding is not easy to be shaped.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, and in particular to a winding system for a CVT capacitor voltage divider. Background Technology

[0002] CN110993377A discloses a winding machine for winding aluminum foil capacitors. This winding machine divides eight strip coils into two groups of three and five, employing clamping rollers at multiple points during the winding process. Because the clamping rollers themselves impede the strip coils, the clamping force needs to be overcome, and a certain degree of stretching is applied to the strip. This results in uneven tension in the strip during winding. After winding, this uneven tension generates a retraction force, and the unequal retraction force can easily cause varying degrees of deformation in the voltage divider after winding.

[0003] Furthermore, conventional CVT capacitors typically only have their aluminum foil folded on one side, and some even omit the fold altogether to control costs. For example, CN105185589A discloses a 35kV high-voltage power capacitor that uses a folded aluminum foil on one side. Even with a folded edge on one side, the unfolded edge on the other side may still have burrs or deformation. These defects can lead to partial discharge and component breakdown under high voltage conditions. Utility Model Content

[0004] The technical problem to be solved by this utility model embodiment is to provide a winding system for a CVT capacitor voltage divider to solve the problem of shrinkage and deformation of CVT capacitor voltage divider components during the winding process.

[0005] To solve the above-mentioned technical problems, this utility model provides a winding system for a CVT capacitor divider, including: a capacitor winding shaft (10), a first guide shaft (21), a second guide shaft (22), a pressure roller (30), a first capacitor paper roll (41), a first lower isolation film roll (42), a first aluminum foil roll (43), a first upper isolation film roll (44), a second capacitor paper roll (45), a second lower isolation film roll (46), a second aluminum foil roll (47), and a second upper isolation film roll (48), wherein the first capacitor paper roll (41), the first lower isolation film roll (42), the first aluminum foil roll (43), the first upper isolation film roll (44), the second capacitor paper roll (45), the second lower isolation film roll (46), the second aluminum foil roll (47), and the second upper isolation film roll (48) are arranged in a specific order. Arranged from bottom to top according to the stacking relationship, the first capacitor paper roll (41), the first lower separator film roll (42), and the first aluminum foil roll (43) are stacked to form the first aluminum foil film group, which is wound on the capacitor take-up shaft (10) through the first through shaft (21); the first upper separator film roll (44), the second capacitor paper roll (45), the second lower separator film roll (46), and the second aluminum foil roll (47) are stacked to form the second aluminum foil film group, which is wound on the capacitor take-up shaft (10) through the second through shaft (22). The second upper separator film roll (48) is wound on the capacitor take-up shaft (10) after being pressed by the pressure roller (30), so that the second upper separator film can apply a winding force to the first aluminum foil film group passing through the first through shaft (21) and the second aluminum foil film group passing through the second through shaft (22).

[0006] Before forming an aluminum foil film assembly with the second aluminum foil, the first upper separator film roll (44), the second capacitor paper roll (45), and the second lower separator film roll (46) pass through multiple shafts.

[0007] Before the first aluminum foil is bonded together with the first capacitor paper and the first lower separator to form the first aluminum foil film group, it is folded inward on both sides by the first folding device.

[0008] Before the second aluminum foil is bonded to the first upper separator film, the second capacitor paper, and the second lower separator film to form the second aluminum foil film group, it is also folded inward on both sides by the second folding device.

[0009] Both the first folding device (5a) and the second folding device (5b) adopt aluminum foil folding device (50). The aluminum foil folding device (50) includes: feeding pressure roller (51), bending roller (52), inclined guide roller (53) and laminating roller (54). The feeding pressure roller (51) feeds aluminum foil in a flat state. There are two inclined guide rollers (53), which are arranged symmetrically between the bending roller (52) and the laminating roller (54). The inclined guide roller (53) presses the edge of the bent aluminum foil towards the middle. The laminating roller (54) presses the folded edge of the aluminum foil towards the aluminum foil body in an S-shape, thereby releasing the stress generated by the folding edge of the aluminum foil while forming an indentation.

[0010] The bending rollers (52) include a column roller (52a) and a groove roller (52b). The column roller (52a) is located at the bottom and the groove roller (52b) is located at the top. The column roller and the groove roller are not directly connected. The groove roller (52b) includes a main roller in the middle and guide wheels on both sides. The diameter of the main roller of the groove roller is smaller than the diameter of the column roller, and the diameter of the guide wheels on both sides is larger than the diameter of the column roller. The column roller and the guide wheels overlap in the axial direction, and the area of ​​the overlap is not less than one-quarter of the circumference of the column roller. A gap is maintained between the two sides of the column roller and the guide wheels. The size of the gap is slightly larger than the thickness of the aluminum foil. A distance is maintained between the surface of the groove roller and the surface of the column roller. The size of the distance is much larger than the thickness of the aluminum foil.

[0011] The lower edge of the main roller is higher than the upper edge of the column roller; the axis of the main roller is arranged to the right relative to the axis of the column roller.

[0012] The feeding roller (51), bending roller (52) and laminating roller are arranged in an upwardly inclined direction; and the bending roller (52) is arranged in a downward manner relative to the feeding roller (51) and laminating roller (54) on both sides, so that the aluminum foil forms an upward reverse angle after passing through the bending roller (52).

[0013] The inclined guide roller (53) is arranged at a 45-degree angle, and the height and lateral position of the inclined guide roller are adjustable.

[0014] It also includes a frame structure (55), and the feeding roller (51), bending roller (52), inclined guide roller (53) and laminating roller (54) are all mounted on the frame structure (55).

[0015] The CVT capacitor divider winding system provided by this utility model can achieve better tightening force by laminating two aluminum foil film groups through a second upper insulating film, while the two aluminum foil film groups do not need to bear excessive tension, thus making the wound capacitor divider less prone to deformation. Using a double-sided folded edge structure allows both sides of the aluminum foil of the capacitor divider to form folded edges. Since aluminum foil edges may have defects such as burrs, roughness, unevenness, or wavy shapes, uneven electric field distribution during high-voltage connection can lead to partial discharge and component breakdown, affecting product quality and stability. Folding the aluminum foil during winding effectively improves the edge electric field distribution and reduces high-voltage breakdown caused by material defects and burrs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structural layout of the winding system of the CVT capacitor voltage divider described in an embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram of the aluminum foil folding device according to an embodiment of the present invention.

[0018] Figure 3 This is a front view (viewed from the right) of the bending rollers according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the inclined guide roller described in an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the lamination process of the laminating rollers described in an embodiment of the present invention. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Example like Figure 1 As shown, this utility model provides a winding system for a CVT capacitor voltage divider, including: a capacitor winding shaft 10, a first guide shaft 21, a second guide shaft 22, a pressure roller 30, a first capacitor paper roll 41, a first lower isolation film roll 42, a first aluminum foil roll 43, a first upper isolation film roll 44, a second capacitor paper roll 45, a second lower isolation film roll 46, a second aluminum foil roll 47, and a second upper isolation film roll 48. The first capacitor paper roll 41, the first lower isolation film roll 42, the first aluminum foil roll 43, the first upper isolation film roll 44, the second capacitor paper roll 45, the second lower isolation film roll 46, the second aluminum foil roll 47, and the second upper isolation film roll 48 are stacked in a layered relationship from bottom to top. The capacitor is arranged in an upper configuration, in which the first capacitor paper roll 41, the first lower separator film roll 42, and the first aluminum foil roll 43 are stacked to form a first aluminum foil film group, which is wound onto the capacitor take-up shaft 10 via the first guide shaft 21; the first upper separator film roll 44, the second capacitor paper roll 45, the second lower separator film roll 46, and the second aluminum foil roll 47 are stacked to form a second aluminum foil film group, which is wound onto the capacitor take-up shaft 10 via the second guide shaft 22; the second upper separator film roll 48 is wound onto the capacitor take-up shaft 10 after being pressed by the pressure roller 30, so that the second upper separator film can apply a winding force to the first aluminum foil film group passing through the first guide shaft 21 and the second aluminum foil film group passing through the second guide shaft 22.

[0025] Before forming an aluminum foil film assembly with the second aluminum foil, the first upper separator film roll 44, the second capacitor paper roll 45, and the second lower separator film roll 46 pass through multiple shafts.

[0026] Before the first aluminum foil is bonded together with the first capacitor paper and the first lower separator to form the first aluminum foil film group, it is folded inward on both sides by the first folding device.

[0027] Before the second aluminum foil is bonded to the first upper separator film, the second capacitor paper, and the second lower separator film to form the second aluminum foil film group, it is also folded inward on both sides by the second folding device.

[0028] The CVT capacitor divider winding system provided by this utility model can achieve better tightening force by laminating two aluminum foil film groups through a second upper insulating film, while the two aluminum foil film groups do not need to bear excessive tension, thus making the wound capacitor divider less prone to deformation. Using a double-sided folded edge structure allows both sides of the aluminum foil of the capacitor divider to form folded edges. Since aluminum foil edges may have defects such as burrs, roughness, unevenness, or wavy shapes, uneven electric field distribution during high-voltage connection can lead to partial discharge and component breakdown, affecting product quality and stability. Folding the aluminum foil during winding effectively improves the edge electric field distribution and reduces high-voltage breakdown caused by material defects and burrs.

[0029] like Figure 2-4 As shown, this utility model provides an aluminum foil folding device 50, including: a feeding roller 51, a bending roller 52, an inclined guide roller 53, and a laminating roller 54. The feeding roller 51 feeds aluminum foil in a flat state. There are two inclined guide rollers 53, which are arranged symmetrically between the bending roller 52 and the laminating roller 54. The inclined guide roller 53 presses the edge of the bent aluminum foil towards the center. The laminating roller 54 presses the folded edge of the aluminum foil towards the aluminum foil body in an S-shape, thereby releasing the stress generated by the folding of the aluminum foil while forming an indentation.

[0030] The laminating rollers 54 include two rollers, a first roller on the left and a second roller on the right. The height of the second roller is slightly higher than that of the first roller, so that the aluminum foil first passes through the first roller, goes around the first roller, and enters the extrusion gap between the first and second rollers. Then it extends out from the lower part of the second roller to the right, thus forming an S-shaped movement that can repeatedly extrude the aluminum foil. When passing through the first roller, the aluminum foil body side surface bends and extrudes the folded edge side surface; when passing through the second roller, the folded edge side surface bends and extrudes the aluminum foil body side surface, thereby releasing stress.

[0031] The bending rollers 52 include a column roller 52a and a groove roller 52b. The column roller 52a is located at the lower part, and the groove roller 52b is located at the upper part. The column roller and the groove roller are not directly connected. The groove roller 52b includes a main roller in the middle and guide wheels on both sides. The diameter of the main roller of the groove roller is smaller than the diameter of the column roller, and the diameter of the guide wheels on both sides is larger than the diameter of the column roller. The column roller and the guide wheels overlap in the axial direction, and the overlapping area is not less than one-quarter of the circumference of the column roller. A gap is maintained between the two sides of the column roller and the guide wheels, and the size of the gap is slightly larger than the thickness of the aluminum foil. A distance is maintained between the surface of the groove roller and the surface of the column roller, and the size of the distance is much larger than the thickness of the aluminum foil.

[0032] After passing through the bending roller 52, the two sides of the aluminum foil are bent downwards. The feeding roller 51, bending roller 52 and laminating roller 54 form a small V-shaped structure. That is, the cross-section formed by the upper edges of the feeding roller and laminating roller 54 passes through the groove roller of the bending roller, thus forming an upward reverse angle. This allows for better tilting guidance when passing through the tilting guide roller.

[0033] The lower edge of the main roller is higher than the upper edge of the column roller; the axis of the main roller is arranged to the right relative to the axis of the column roller.

[0034] The feeding roller 51, bending roller 52, and laminating roller are arranged in an upward-sloping direction; and the bending roller 52 is arranged in a downward manner relative to the feeding roller 51 and laminating roller 54 on both sides, so that the aluminum foil forms an upward reverse angle after passing through the bending roller 52; since the two sides of the aluminum foil are bent downward, which is opposite to the upward reverse angle of the aluminum foil during the process of aluminum foil travel, the two sides of the bent edges of the aluminum foil bear a greater tensile force together, so that under the action of the two sides of the tensile force, the two sides of the aluminum foil are bent and simultaneously tilted inward and gathered together.

[0035] The inclined guide roller 53 is arranged at a 45-degree angle, and the height and lateral position of the inclined guide roller are adjustable.

[0036] It also includes a frame structure 55, and the feeding roller 51, bending roller 52, inclined guide roller 53 and laminating roller 54 are all mounted on the frame structure 55.

[0037] The utility model provides a method for folding aluminum foil on both sides, including: S1. Aluminum foil is supplied by the feeding roller 51 and flattened. S2. The aluminum foil passes through the bending rollers 52, and the edges on both sides are simultaneously pressed down by the bending rollers 52 to form a 90-degree bend. S3. The inclined guide roller 53 simultaneously tilts and presses the two sides of the bent aluminum foil inward, so that the two sides of the aluminum foil and the aluminum foil body form an acute angle. S4. The aluminum foil enters between the laminating rollers 54, and the laminating rollers 54 press the two sides of the bent aluminum foil towards the aluminum foil body and bond it to the aluminum foil body.

[0038] In step S2, the main body of the aluminum foil passes through the roller, and the edges on both sides are guided by the guide wheels into the gap between the roller and the guide wheels, and are bent vertically downward by the guide wheels. Then, the aluminum foil passes through the upward reverse angle formed by the grooved roller, causing the bent edges of the aluminum foil to further adhere to the aluminum foil body.

[0039] Step S3 also includes adjusting the lateral position and height of the inclined guide roller 53.

[0040] In step S4, the aluminum foil is repeatedly laminated by the laminating roller 54 in an S-shaped pattern.

[0041] During the folding process, the aluminum foil is flattened by the feeding pressure roller 51 and then conveyed to the bending roller 52. Before being conveyed to the bending roller, the two sides of the aluminum foil begin to gradually tilt downwards and deform. When it reaches the vertical gap formed between the column roller and the guide roller of the bending roller, the edge of the aluminum foil is bent downwards by the vertical gap. Then the main body of the aluminum foil and the two sides form an n-shaped shape. The main body of the aluminum foil passes through the groove roller of the bending roller and then forms an upward reverse angle, which causes the folded edges on both sides to tilt inwards. When it passes through the inclined guide roller, it is further pressed by the inclined guide roller until it reaches the lamination roller. Then the roller passes through the S-shaped movement and repeatedly laminates the folded edge to make the folded edge fit with the main body of the aluminum foil.

[0042] This invention provides a method for double-sided folding of aluminum foil, which simultaneously folds both sides of the aluminum foil inward to form a wrapped edge structure. Stress is released through lamination rollers, ensuring better shaping of the folded aluminum foil. Using an aluminum foil folding device to fold both sides of the aluminum foil results in smooth and flat edges, fundamentally preventing discharge caused by defects on both sides of the aluminum foil and avoiding high-voltage breakdown of components. This improves the withstand voltage of components and facilitates more reliable product operation.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A winding system for a CVT capacitor divider, characterized in that, include: The capacitor winding shaft (10), first guide shaft (21), second guide shaft (22), pressure roller (30), first capacitor paper roll (41), first lower separator film roll (42), first aluminum foil roll (43), first upper separator film roll (44), second capacitor paper roll (45), second lower separator film roll (46), second aluminum foil roll (47), and second upper separator film roll (48) are arranged from bottom to top according to the stacking relationship. The first aluminum foil roll is formed by stacking the first aluminum foil roll (41), the first lower separator film roll (42), and the first aluminum foil roll (43), and is wound on the capacitor take-up shaft (10) through the first through shaft (21); the second aluminum foil roll is formed by stacking the first upper separator film roll (44), the second capacitor paper roll (45), the second lower separator film roll (46), and the second aluminum foil roll (47), and is wound on the capacitor take-up shaft (10) through the second through shaft (22). The second upper separator film roll (48) is wound on the capacitor take-up shaft (10) after being pressed by the pressure roller (30), so that the second upper separator film can apply a winding force to the first aluminum foil roll through the first through shaft (21) and the second aluminum foil roll through the second through shaft (22).

2. The winding system according to claim 1, characterized in that, Before forming an aluminum foil film assembly with the second aluminum foil, the first upper separator film roll (44), the second capacitor paper roll (45), and the second lower separator film roll (46) pass through multiple shafts.

3. The winding system according to claim 1, characterized in that, Before the first aluminum foil is bonded together with the first capacitor paper and the first lower separator to form the first aluminum foil film group, it is folded inward on both sides by the first folding device.

4. The winding system according to claim 1, characterized in that, Before the second aluminum foil is bonded to the first upper separator film, the second capacitor paper, and the second lower separator film to form the second aluminum foil film group, it is also folded inward on both sides by the second folding device.

5. The winding system according to claim 3 or 4, characterized in that, Both the first folding device (5a) and the second folding device (5b) adopt aluminum foil folding device (50). The aluminum foil folding device (50) includes: feeding pressure roller (51), bending roller (52), inclined guide roller (53) and laminating roller (54). The feeding pressure roller (51) feeds aluminum foil in a flat state. There are two inclined guide rollers (53), which are arranged symmetrically between the bending roller (52) and the laminating roller (54). The inclined guide roller (53) presses the edge of the bent aluminum foil towards the middle. The laminating roller (54) presses the folded edge of the aluminum foil towards the aluminum foil body in an S-shape, thereby releasing the stress generated by the folding edge of the aluminum foil while forming an indentation.

6. The winding system according to claim 5, characterized in that, The bending rollers (52) include a column roller (52a) and a groove roller (52b). The column roller (52a) is located at the bottom and the groove roller (52b) is located at the top. The column roller and the groove roller are not directly connected. The groove roller (52b) includes a main roller in the middle and guide wheels on both sides. The diameter of the main roller of the groove roller is smaller than the diameter of the column roller, and the diameter of the guide wheels on both sides is larger than the diameter of the column roller. The column roller and the guide wheels overlap in the axial direction, and the area of ​​the overlap is not less than one-quarter of the circumference of the column roller. A gap is maintained between the two sides of the column roller and the guide wheels. The size of the gap is slightly larger than the thickness of the aluminum foil. A distance is maintained between the surface of the groove roller and the surface of the column roller. The size of the distance is much larger than the thickness of the aluminum foil.

7. The winding system according to claim 6, characterized in that, The lower edge of the main roller is higher than the upper edge of the column roller; the axis of the main roller is arranged to the right relative to the axis of the column roller.

8. The winding system according to claim 6, characterized in that, The feeding roller (51), bending roller (52) and laminating roller are arranged in an upwardly inclined direction; and the bending roller (52) is arranged in a downward manner relative to the feeding roller (51) and laminating roller (54) on both sides, so that the aluminum foil forms an upward reverse angle after passing through the bending roller (52).

9. The winding system according to claim 6, characterized in that, The inclined guide roller (53) is arranged at a 45-degree angle, and the height and lateral position of the inclined guide roller are adjustable.

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