Double split foil wound coil mold

Abstract

The utility model discloses a kind of double-split foil winding type coil mould, it is related to transformer coil winding mould technical field, wherein, including frame body, fixed plate and insulating cylinder, frame body includes first component and second component, the cross section of first component and second component is semicircular ring, first component and second component cooperate, to be used for the shaft of winding machine, fixed plate is welded in first component or second component along the axial direction of frame body, both ends of fixed plate are provided with mounting hole, mounting hole is used for being connected with copper bar by bolt, insulating cylinder is used for being set in frame body, and insulating cylinder is fixedly connected with frame body, insulating cylinder is provided with the clamping position corresponding with fixed plate, clamping position includes first clamping groove and second clamping groove, first clamping groove and second clamping groove are respectively used for clamping with two copper bars. The double-split foil winding type coil mould not only can prevent copper foil displacement phenomenon under the action of tension, but also can realize two split units winding simultaneously, greatly improve winding efficiency.

Description

Technical Field

[0001] This utility model relates to the field of transformer coil winding mold technology, and in particular to a double-split foil winding coil mold. Background Technology

[0002] Double-split transformers are widely used in power grid transmission and distribution, new energy grid connection and industrial special power supply fields due to their advantages such as enabling multiple independent outputs, reducing short-circuit current and optimizing power distribution.

[0003] Currently, the winding of double-split foil-wound coils generally requires first winding a first layer of copper foil on a mold. After winding a certain length, a second layer of copper foil is then wound, spaced apart from the first layer. This process forms a double-split foil-wound coil. The entire winding process is complex and inefficient.

[0004] Therefore, it is necessary to provide a new double-split foil-wound coil mold to solve the above-mentioned technical problems. Utility Model Content

[0005] The main purpose of this invention is to propose a double-split foil-wound coil mold, which aims to improve the technical problems of low winding efficiency and complex operation of double-split foil-wound coils in the prior art.

[0006] To achieve the above objectives, this utility model provides a double-split foil-wound coil mold, comprising:

[0007] The frame includes a first component and a second component, the first component and the second component having a semi-circular cross-section, the first component and the second component cooperating to be fitted onto the rotating shaft of the winding machine;

[0008] A fixing plate is welded to the first component or the second component along the axial direction of the frame. Both ends of the fixing plate are provided with mounting holes, which are used to connect to the copper busbar by bolts.

[0009] An insulating cylinder is used to be sleeved on the frame and is fixedly connected to the frame. The insulating cylinder is provided with a snap-fit ​​position corresponding to the fixed plate. The snap-fit ​​position includes a first snap-fit ​​groove and a second snap-fit ​​groove that are spaced apart along the axial direction of the insulating cylinder. The first snap-fit ​​groove and the second snap-fit ​​groove are respectively used to snap-fit ​​with two copper busbars.

[0010] In one embodiment, the fixing plate is arranged along the axis of symmetry of the first component or the second component.

[0011] In one embodiment, the length of the insulating cylinder is greater than the length of the frame.

[0012] In one embodiment, the double-split foil-wound coil mold further includes a plurality of first connecting plates and a plurality of second connecting plates. The first connecting plates are connected to one end of the frame, and the second connecting plates are connected to the other end of the frame. The plurality of first connecting plates and the plurality of second connecting plates are arranged in a circle around the center of the frame, with the center line of the fixed plate as the starting point. The plurality of first connecting plates and the plurality of second connecting plates are fixedly connected to the insulating cylinder.

[0013] In one embodiment, the thickness of both the first connecting plate and the second connecting plate ranges from 3 mm to 5 mm.

[0014] In one embodiment, the lengths of both the first connecting plate and the second connecting plate range from 9 mm to 11 mm.

[0015] In one embodiment, each of the first connecting plates has a first fixing hole, each of the second connecting plates has a second fixing hole, one end of the insulating cylinder has a plurality of first connecting holes corresponding to the first fixing holes, and the other end of the insulating cylinder has a plurality of second connecting holes corresponding to the second fixing holes. The first connecting holes are connected to the first fixing holes by bolts, and the second connecting holes are connected to the second fixing holes by bolts.

[0016] In one embodiment, the insulating cylinder is an epoxy glass insulating cylinder.

[0017] In one embodiment, the thickness of the insulating cylinder ranges from 4 mm to 8 mm.

[0018] In one embodiment, the distance between the first card slot and the second card slot ranges from 35mm to 50mm.

[0019] In the above scheme, the double-split foil-wound coil mold includes a frame, a fixing plate, and an insulating cylinder. The frame includes a first component and a second component. The cross-section of the first component and the second component is semi-circular. The first component and the second component cooperate to be fitted onto the rotating shaft of the winding machine. The fixing plate is welded to the first component or the second component along the axial direction of the frame. Both ends of the fixing plate are provided with mounting holes. The mounting holes are used to connect to copper busbars by bolts. The insulating cylinder is used to fit onto the frame and is fixedly connected to the frame. The insulating cylinder is provided with snap-fit ​​positions corresponding to the fixing plate. The snap-fit ​​positions include a first slot and a second slot spaced apart along the axial direction of the insulating cylinder. The first slot and the second slot are respectively used to snap-fit ​​two copper busbars. Specifically, the length of the first and second components is the height of the low-voltage coil. A fixing plate is welded onto either the first or second component, the length of which is determined by the length of the copper busbars. The inner walls of both the first and second components are fitted against the rotating shaft of the winding device. The first and second components are then fixedly connected, clamping them onto the rotating shaft. An insulating sleeve is then fitted onto the frame, aligning the first and second slots on the insulating sleeve with the fixing plate. Two copper busbars are fixed to both ends of the fixing plate with bolts, spaced apart along the length of the fixing plate. One copper busbar is engaged in the first slot, and the other is engaged in the second slot. The copper busbar is connected to the second slot, and bolts restrict its displacement. The first and second slots are engaged to restrict its rotation. This ensures the copper busbar does not rotate or shift during winding. The winding machine is then started, and the shaft drives the frame and insulating cylinder to rotate synchronously. Two copper foil rolls are positioned on either side of the mold, and the copper foil on each roll is welded to the two copper busbars. This allows for the simultaneous winding of two coil units with opposite winding directions and spacing. Once both coil units have reached the target number of turns, the winding machine stops, the copper foil is cut, and the coil ends are bound with fiberglass tape to ensure stable forming of the double-split foil-wound coil. This invention not only enables simultaneous winding of two split units, simplifying the winding process and greatly improving winding efficiency, but also securely fixes the insulating cylinder to the mold frame, ensuring the copper busbar does not shift due to copper foil tension. Attached Figure Description

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

[0021] Figure 1 A schematic diagram of the structure of an embodiment of the frame provided by this utility model from one perspective;

[0022] Figure 2 A structural schematic diagram of another embodiment of the frame provided by this utility model;

[0023] Figure 3 A schematic diagram of the structure of an embodiment of the insulating cylinder provided by this utility model from one perspective;

[0024] Figure 4 This is a structural schematic diagram from another perspective of an embodiment of the insulating cylinder provided by this utility model.

[0025] Explanation of icon numbers:

[0026] 1. Frame; 11. First component; 12. Second component; 2. Fixing plate; 21. Mounting hole; 3. Insulating cylinder; 31. Snap-fit ​​position; 311. First slot; 312. Second slot; 32. First connecting hole; 33. Second connecting hole; 4. First connecting plate; 41. First fixing hole; 5. Second connecting plate; 51. Second fixing hole.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] To achieve the above objectives, please refer to Figures 1 to 4This utility model proposes a double-split foil-wound coil mold, including a frame 1, a fixing plate 2, and an insulating cylinder 3. The frame 1 includes a first component 11 and a second component 12. The cross-section of the first component 11 and the second component 12 is semi-circular. The first component 11 and the second component 12 cooperate to be sleeved on the rotating shaft of the winding machine. The fixing plate 2 is welded to the first component 11 or the second component 12 along the axial direction of the frame 1. Both ends of the fixing plate 2 are provided with mounting holes 21. The mounting holes 21 are used to connect to copper busbars by bolts. The insulating cylinder 3 is used to be sleeved on the frame 1 and is fixedly connected to the frame 1. The insulating cylinder 3 is provided with a snap-fit ​​position 31 corresponding to the fixing plate 2. The snap-fit ​​position 31 includes a first snap groove 311 and a second snap groove 312 spaced apart along the axial direction of the insulating cylinder 3. The first snap groove 311 and the second snap groove 312 are respectively used to snap with two copper busbars. Specifically, the length of the first component 11 and the second component 12 is the height of the low-voltage coil. A fixing plate 2 is welded onto the first component 11 or the second component 12. The length of the fixing plate 2 is determined according to the length of the copper busbar. The inner walls of the first component 11 and the second component 12 are fitted to the shaft of the winding device. Then, the first component 11 and the second component 12 are fixedly connected, thereby clamping the first component 11 and the second component 12 onto the shaft. Then, the insulating cylinder 3 is sleeved onto the frame 1, and the first slot 311 and the second slot 312 on the insulating cylinder 3 correspond to the fixing plate 2. Two copper busbars are fixed at both ends of the fixing plate 2 by bolts. The two copper busbars are spaced apart along the length of the fixing plate 2. At this time, one of the copper busbars is clamped into the first... In slot 311, another copper busbar is engaged in the second slot 312. The displacement of the copper busbar is restricted by bolts, and the rotation of the copper busbar is restricted by the engagement of the first slot 311 and the second slot 312. This ensures that the copper busbar will not rotate or move during winding. Then, the winding machine is started, and the shaft drives the frame 1 and the insulating cylinder 3 to rotate synchronously. Two copper foil rolls are respectively placed on both sides of the mold, and the copper foil on the two copper foil rolls is welded to the two copper busbars respectively. This allows two coil units with opposite winding directions and intervals to be wound at the same time. When both coil units reach the target number of turns, the winding machine stops, the copper foil is cut, and then the ends of the coil are tied with glass ribbon to ensure the stable forming of the double-split foil-wound coil. In this embodiment, a fixing plate 2 for connecting to the copper busbar is welded onto the frame 1, and a first slot 311 and a second slot 312 corresponding to the fixing plate 2 are formed on the insulating copper. Two copper busbars are engaged in the first slot 311 and the second slot 312, thus enabling the simultaneous winding of two split units, simplifying the winding steps and greatly improving winding efficiency. Furthermore, the frame 1 is divided into a first component 11 and a second component 12, which are interconnected to securely fix the insulating cylinder 3 to the frame 1, ensuring that the copper busbars do not shift due to copper foil tension.

[0032] The frame 1 is assembled from the first component 11 and the second component 12, and can be easily disassembled.

[0033] The copper busbars at both ends of the fixing plate 2 are symmetrically distributed along the axial direction, and the first slot 311 and the second slot 312 of the insulating cylinder 3 are symmetrically distributed accordingly, avoiding the risk of insulation breakdown caused by local field strength concentration; the symmetrically distributed copper busbars and slots form a physical separation barrier, supporting the simultaneous winding of two split units without stopping the machine to switch the winding direction, thus improving winding efficiency.

[0034] Furthermore, the inner diameters at both ends of the insulating cylinder 3 are chamfered, which makes it easier to fit the insulating cylinder 3 onto the frame 1.

[0035] Please see Figure 1 and Figure 2 In one embodiment, the fixing plate 2 is arranged along the axis of symmetry of the first component 11 or the second component 12. During winding, the tension of the copper foil is transmitted to the fixing plate 2 through the copper busbar, and then from the fixing plate 2 to the first component 11 or the second component 12. If the fixing plate 2 deviates from the axis of symmetry, it will cause excessive local stress on the first component 11 or the second component 12, resulting in radial bending. The fixing plate 2, arranged along the axis of symmetry, can evenly distribute the tension throughout the first component 11 or the second component 12, thereby improving the fatigue life of the mold and meeting the needs of long-term mass production. The position of the fixing plate 2 is uniform in different batches of molds, and accessories such as copper busbars and insulating cylinders 3 can be produced in a standardized manner without the need for separate design, which can reduce manufacturing costs.

[0036] In one embodiment, the length of the insulating cylinder 3 is greater than the length of the frame 1. During the coil winding process, the foil is prone to bulging or loosening at both ends of the axial direction due to lack of support. If the insulating cylinder 3 is the same length as the frame 1, the frame 1 can only support the effective winding area in the middle of the coil, and the foil at the ends is prone to deformation due to lack of support. The insulating cylinder 3 is longer than the frame 1, and the part that extends beyond the frame 1 can serve as an extension support for the ends of the coil, forcibly constraining the arrangement of the foil at the ends, avoiding loosening or bulging, ensuring the overall axial dimensional accuracy of the coil, and improving the flatness of the ends, which is convenient for subsequent assembly of the coil body.

[0037] In actual production, the same specification mold may need to wind coils of different lengths. If the insulating cylinder 3 and the frame 1 are the same length, and the length of the frame 1 is fixed, it cannot accommodate slightly longer coils. If the frame 1 is replaced, it will increase the cost. If the length of the insulating cylinder 3 is greater than that of the frame 1, the excess part can be used to accommodate the winding requirements of slightly longer coils without replacing the frame 1. This improves the mold's adaptability to different coil specifications and reduces the mold cost for multi-specification production.

[0038] Please see Figure 1 and Figure 2In one embodiment, the double-split foil-wound coil mold further includes multiple first connecting plates 4 and multiple second connecting plates 5. The first connecting plates 4 are connected to one end of the frame 1, and the second connecting plates 5 are connected to the other end of the frame 1. The multiple first connecting plates 4 and multiple second connecting plates 5 are arranged in a circle around the center of the frame 1, with the center line of the fixing plate 2 as the starting point. The multiple first connecting plates 4 and multiple second connecting plates 5 are fixedly connected to the insulating cylinder 3. The traditional fixing method between the insulating cylinder 3 and the frame 1 relies on local contact or friction. After high-speed winding or long-term use, the fit is prone to loosening due to vibration and temperature rise, causing the insulating cylinder 3 to slip circumferentially or move axially relative to the frame 1, affecting the coil winding accuracy. Multiple first connecting plates 4 and second connecting plates 5 are arranged around the center of the frame 1 with the center line of the fixed plate 2 as the starting point, and are fixedly connected to the insulating cylinder 3 to form a multi-point uniform fixing structure at both ends. The connecting plates rigidly lock the insulating cylinder 3 to the frame 1. The torque is uniformly transmitted through multiple circumferentially distributed connecting plates to avoid slippage caused by excessive local contact stress. The relative rotation angle of the insulating cylinder 3 in the circumference is 0. The connecting plates at both ends form an axial bidirectional clamping to restrict the movement of the insulating cylinder 3 along the axial direction of the frame 1.

[0039] Furthermore, the first connecting plate 4 and the second connecting plate 5 are both distributed in a 60° fan shape, and there are 5 of each of the first connecting plate 4 and the second connecting plate 5. According to the design of this embodiment, the insulating cylinder 3 and the frame 1 are firmly connected without increasing the cost too much.

[0040] In one embodiment, the thickness of both the first connecting plate 4 and the second connecting plate 5 is between 3mm and 5mm. The thickness range of 3mm to 5mm ensures that the first connecting plate 4 and the second connecting plate 5 do not undergo plastic deformation when subjected to tension, thus ensuring a rigid connection between the insulating cylinder 3 and the frame 1. Compared with the traditional 8mm to 10mm thick connecting plates, the weight is reduced and the cost is lower.

[0041] In one embodiment, the lengths of the first connecting plate 4 and the second connecting plate 5 are both in the range of 9mm to 11mm. The lengths of the first connecting plate 4 and the second connecting plate 5 directly affect the deformation during torque transmission. If the length is too long, the lever arm increases, and the first connecting plate 4 and the second connecting plate 5 are prone to bending due to torque, causing the insulating cylinder 3 to slip circumferentially. If the length is too short, the connection area is insufficient, and the connection is prone to loosening. In this embodiment, setting the length to 9mm to 11mm can achieve rigid transmission with a short lever arm. The lever arm is small, the torsional stiffness of the connecting plate is improved, the length is moderate, and the connection area can also meet the connection with the insulating cylinder 3.

[0042] Please see Figure 1 , Figure 3 and Figure 4In one embodiment, each first connecting plate 4 has a first fixing hole 41, and each second connecting plate 5 has a second fixing hole 51. One end of the insulating cylinder 3 has a plurality of first connecting holes 32 corresponding to the first fixing holes 41, and the other end of the insulating cylinder 3 has a plurality of second connecting holes 33 corresponding to the second fixing holes 51. The first connecting holes 32 are connected to the first fixing holes 41 by bolts, and the second connecting holes 33 are connected to the second fixing holes 51 by bolts. Connecting the insulating cylinder 3, the first connecting plate 4, and the second connecting plate 5 by bolts ensures connection strength while enabling faster installation and disassembly.

[0043] In one embodiment, the insulating cylinder 3 is an epoxy glass insulating cylinder 3. The insulating cylinder 3 needs to withstand the tension of the foil material. Using epoxy glass material to make the insulating cylinder 3 provides high compressive strength, preventing uneven interlayer gaps in the foil material caused by the collapse of the insulating cylinder 3. The surface quality of the insulating cylinder 3 directly affects the flatness of the foil during winding and the dimensional accuracy of the coil. The epoxy glass insulating cylinder 3 can be precision machined to ensure excellent surface finish. Compared to metal insulating cylinders 3, epoxy glass insulating cylinders 3 have advantages in weight and corrosion resistance.

[0044] In one embodiment, the thickness of the insulating cylinder 3 ranges from 4 mm to 8 mm. While meeting the bending strength requirements, a thickness of 4 mm to 8 mm results in a lighter weight compared to an insulating cylinder 3 with a thickness of 10 mm to 12 mm, and also allows for more efficient replacement when needed.

[0045] In one embodiment, the distance between the first slot 311 and the second slot 312 ranges from 35mm to 50mm. This 35mm to 50mm distance range can accommodate the insulation requirements of medium-low voltage to some high-voltage coils. A suitable spacing avoids localized field concentration due to excessive proximity or material waste due to excessive distance, balancing insulation reliability and structural compactness. The capacity ratio of the double-split coil is achieved through the size difference of the split units. The slot spacing determines the relative position of the two units, and a range of 35mm to 50mm can accommodate different capacity ratio requirements.

[0046] The above are merely exemplary embodiments of this utility model and do not limit the scope of protection of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A double-split foil-wound coil mold, characterized in that, include: The frame includes a first component and a second component, the first component and the second component having a semi-circular cross-section, the first component and the second component cooperating to be fitted onto the rotating shaft of the winding machine; A fixing plate is welded to the first component or the second component along the axial direction of the frame. Both ends of the fixing plate are provided with mounting holes, which are used to connect to the copper busbar by bolts. An insulating cylinder is used to be sleeved on the frame and is fixedly connected to the frame. The insulating cylinder is provided with a snap-fit ​​position corresponding to the fixed plate. The snap-fit ​​position includes a first snap-fit ​​groove and a second snap-fit ​​groove that are spaced apart along the axial direction of the insulating cylinder. The first snap-fit ​​groove and the second snap-fit ​​groove are respectively used to snap-fit ​​with two copper busbars.

2. The double-split foil-wound coil mold as described in claim 1, characterized in that, The fixing plate is arranged along the axis of symmetry of the first component or the second component.

3. The double-split foil-wound coil mold as described in claim 2, characterized in that, The length of the insulating cylinder is greater than the length of the frame.

4. The double-split foil-wound coil mold as described in claim 3, characterized in that, The double-split foil-wound coil mold also includes multiple first connecting plates and multiple second connecting plates. The first connecting plates are connected to one end of the frame, and the second connecting plates are connected to the other end of the frame. The multiple first connecting plates and multiple second connecting plates are arranged in a circle around the center of the frame, with the center line of the fixed plate as the starting point. The multiple first connecting plates and multiple second connecting plates are fixedly connected to the insulating cylinder.

5. The double-split foil-wound coil mold as described in claim 4, characterized in that, The thickness of both the first connecting plate and the second connecting plate ranges from 3mm to 5mm.

6. The double-split foil-wound coil mold as described in claim 4, characterized in that, The lengths of both the first connecting plate and the second connecting plate range from 9mm to 11mm.

7. The double-split foil-wound coil mold as described in claim 4, characterized in that, Each of the first connecting plates has a first fixing hole, and each of the second connecting plates has a second fixing hole. One end of the insulating cylinder has a plurality of first connecting holes corresponding to the first fixing holes, and the other end of the insulating cylinder has a plurality of second connecting holes corresponding to the second fixing holes. The first connecting holes are connected to the first fixing holes by bolts, and the second connecting holes are connected to the second fixing holes by bolts.

8. The double-split foil-wound coil mold according to any one of claims 1 to 7, characterized in that, The insulating cylinder is an epoxy glass insulating cylinder.

9. The double-split foil-wound coil mold according to any one of claims 1 to 7, characterized in that, The thickness of the insulating cylinder ranges from 4 mm to 8 mm.

10. The double-split foil-wound coil mold according to any one of claims 1 to 7, characterized in that, The distance between the first card slot and the second card slot ranges from 35mm to 50mm.

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