Simple winding die for oil-immersed power transformer

Abstract

The present invention discloses a simple winding mold for an oil-immersed power transformer, and specifically relates to the technical field of transformer winding, comprising a center ring, on which a support assembly is provided, wherein the support assembly comprises a support cylinder provided at the top of a dislocation cavity, and a plurality of pads are distributed on the outside of the support cylinder. The present invention can resist the radial inward pressure during the winding of the wire through the corresponding coordinated use of various structures, avoid the collapse or bulging of the inner layer of the coil due to tension compression, provide more uniform outer support, and significantly improve the circular retention of the coil cross section. The sector-shaped cross-section design and the nested coordination of adjacent extension plates can realize segmented and layered support for the coil. The structure can flexibly adjust the support range according to the thickness of the coil, cooperate with the reference plate to position the wire, and effectively avoid the slipping and uneven accumulation of the wire during wide coil or multi-layer winding. Combined with the winding tension and pre-pressing process, it can greatly improve the overall tightness and radial mechanical strength of the coil.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer winding, and more particularly to a simple winding die for an oil-immersed power transformer. Background Art

[0002] Oil-immersed transformer, also known as oil-immersed test transformer, distribution transformer is an important component of substation. Oil-immersed transformer is generally installed in a separate transformer room and relies on oil as cooling medium, such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling and forced oil circulation. The transformer requires a coil, and the coil is wound through a winding mold.

[0003] Among them, the patent with announcement number CN209249287U discloses a simple winding mold for an oil-immersed power transformer, including a base, a column, a first fixing ring, an electric telescopic rod, a second fixing ring, a winding column, an anti-slip pad and a control switch. The top middle part of the base is fixedly connected to the column;

[0004] During use, this structure controls the extension or contraction of the electric telescopic rod via a control switch, which in turn drives the second fixed ring outward or inward, and thus the winding posts within the second fixed ring outward or inward, thereby adjusting the diameter of the opening formed by the four sets of winding posts. However, the contact area between the winding posts and the wire is relatively small. As the coil reaches the outer layer (especially in multi-layer coils or wide coils), the weight of the wire and the winding tension cause the inner layer of the wire to be subjected to increasing radial inward pressure. This causes the inner layer of the coil to compress, easily changing the entire coil cross-section from circular to elliptical (commonly known as "collapse" or "bulging"), which is particularly serious during the preloading process. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a simple winding mold for an oil-immersed power transformer, aiming to solve the problems raised in the above-mentioned background technology.

[0006] The present invention provides the following technical solution: a simple winding die for an oil-immersed power transformer, comprising a center ring, on which a support assembly is provided;

[0007] The support assembly includes a support cylinder arranged at the top of the center ring, a plurality of pads are distributed on the outside of the support cylinder, and a supporting plate is provided on one side of each pad, and a limiting groove is provided on the surface of the plurality of supporting plates;

[0008] Two center cylinders are sleeved on the outside of the support cylinder, and a plurality of sliders are slidably connected to the outside of each center cylinder, and the plurality of sliders are respectively located on one side of the corresponding pad, and a plurality of limit blocks are fixedly provided on the side of the pad away from the support plate, and the plurality of limit blocks are provided with an oblique groove, and the sliders extend into the oblique groove and are slidably connected to the oblique groove, and a screw rod is threadedly connected to the oblique groove;

[0009] Optionally, in a possible embodiment, a tray is provided at the bottom of the center ring, a plurality of staggered openings are opened through the tray, and each of the staggered openings is respectively located below the pad, a plurality of vertical rods are slidably connected in the staggered openings, and each of the vertical rods is respectively fixed to the bottom of the corresponding pad, a plurality of interference wheels are respectively provided on both sides of the vertical rods, and an offset cavity is formed between each two adjacent interference wheels, the tray is located in the middle of the staggered cavity, and the interference wheel is in contact with the tray, a plurality of reference plates are distributed on the outside of the tray, and each of the reference plates is respectively located on one side of the bottom of the corresponding support plate;

[0010] Optionally, in a possible embodiment, side connecting rods are respectively provided on both sides of the support plate, and each of the side connecting rods is provided with a transverse groove, and a plurality of extension plates are respectively slidably connected in the transverse grooves, and the cross-sectional shapes of the plurality of extension plates are all arranged to be fan-shaped, and a stopper is respectively provided at one end of each extension plate, and the plurality of extension plates are distributed along the axial circumference of the support tube, and two adjacent extension plates are slidably connected;

[0011] Optionally, in a possible embodiment, a locking sleeve is provided in the middle of the center tube, and the locking sleeve is provided on the outside of the support tube. A support ring is fixedly provided at one end of the support tube, and the screw rod is located on the support ring and is rotatably connected to the support ring. The vertical cross-sectional shapes of the inclined groove and the slider are both set to be triangular, and both sides of the inner wall of the inclined groove are provided with a blocking rod wrapped around the outside of the slider.

[0012] Technical effects and advantages of the present invention:

[0013] 1. The present invention uses a screw to drive the slider to slide within the chute, driving the pad and support plate to spread outward along the axis of the support tube, forming an adjustable radial support force. This structure can resist the radial inward pressure during wire winding, preventing the inner layer of the coil from collapsing or bulging due to tension compression, providing more uniform external support, and significantly improving the circularity of the coil cross section.

[0014] 2. The extension plates on both sides of the support plate of this invention slide along the transverse grooves of the side connecting rods. Through their sector-shaped cross-section design and nested cooperation with adjacent extension plates, they provide segmented and layered support for the coils. This structure flexibly adjusts the support range according to coil thickness. Combined with the reference plate's positioning of the wires, it effectively prevents wire slippage and uneven accumulation during wide coils or multi-layer winding. Combined with the winding tension and preloading process, it significantly improves the overall coil density and radial mechanical strength.

[0015] 3. The vertical rod of the present invention is slidably connected to the misaligned opening of the tray, and the limiting function of the abutment wheel and the misaligned cavity ensures the stability of the pad during movement. The center tube is fixed to the support tube by a locking sleeve, and the rotational connection between the lead screw and the support ring realizes precise drive. This design enables the mold to adapt to the winding requirements of coils of different specifications while maintaining structural rigidity during the adjustment process, reducing the risk of coil deformation caused by unstable support.

[0016] In summary, the coordinated use of various structures can resist radial inward pressure during wire winding, preventing collapse or bulging of the inner coil layer due to tension compression. This provides more uniform external support, significantly improving the circular shape of the coil cross section. The sector-shaped cross-section design and the nesting of adjacent extension plates enable segmented and layered support for the coil. This structure flexibly adjusts the support range based on coil thickness, and, in conjunction with the reference plate's positioning of the wire, effectively prevents wire slippage and uneven accumulation during wide coils or multi-layer winding. Combined with the winding tension and preloading process, it significantly improves the overall coil's tightness and radial mechanical strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below are schematic diagrams and are not intended to limit the actual dimensions of the products, actual processes of the methods, actual timing of signals, and the like involved in the embodiments of the present disclosure.

[0018] Figure 1 It is the main view of the overall structure of the present invention.

[0019] Figure 2 It is a top view of the overall structure of the present invention.

[0020] Figure 3 Schematic diagram of the support assembly of the present invention.

[0021] Figure 4 It is a schematic diagram of the support plate, side connecting rods, vertical rods and contact wheels of the present invention.

[0022] Figure 5It is a schematic diagram of the support cylinder, pad, slider and dislocation cavity of the present invention.

[0023] Figure 6 It is a schematic diagram of the center tube, slider, pad and limit block of the present invention.

[0024] Figure 7 Schematic diagram of the support cylinder, tray, reference plate and offset cavity of the present invention.

[0025] Figure 8 Schematic diagram of the support plate, extension plate, stopper, side connecting rod and vertical rod of the present invention.

[0026] The accompanying drawings are marked as follows: 1. Center ring; 2. Support tube; 3. Pad; 4. Support plate; 5. Limit groove; 6. Center tube; 7. Slider; 8. Limit block; 9. Inclined groove; 10. Screw; 11. Tray; 12. Offset mouth; 13. Vertical rod; 14. Interference wheel; 15. Side connecting rod; 16. Horizontal groove; 17. Extension plate; 18. Stop block; 19. Reference plate; 20. Locking sleeve; 21. Offset cavity; 22. Support ring. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] As attached Figure 1 -Attached Figure 8 The simplified winding mold for an oil-immersed power transformer shown in the figure, through the support assembly provided on the center ring 1, can resist the radial inward pressure during the winding of the wire, preventing the inner layer of the coil from collapsing or bulging due to tension compression. It can provide more uniform external support, significantly improving the circularity of the coil cross section. Through the sector-shaped cross-section design and the nesting of adjacent extension plates, the coil can be supported in sections and layers. This structure can flexibly adjust the support range according to the thickness of the coil, and cooperates with the positioning of the wire by the reference plate 19 to effectively prevent the wire from slipping and uneven accumulation during wide coils or multi-layer winding. Combined with the winding tension and pre-stressing process, it can significantly improve the overall tightness and radial mechanical strength of the coil. The specific structural configuration of the assembly is as follows;

[0029] The support assembly includes a support tube 2 arranged at the top of the center ring 1. A plurality of pads 3 are distributed on the outside of the support tube 2, and a support plate 4 is provided on one side of each pad 3. The surfaces of the plurality of support plates 4 are provided with a limiting groove 5.

[0030] As attached Figure 1 、 3As shown in FIG4 , the wire body is supported by the support plate 4 , and each limiting groove 5 first positions the wire body wound on the surface of the support plate 4 to ensure the winding stability of the wire body.

[0031] Two central tubes 6 are sleeved on the outside of the support tube 2, and a plurality of sliders 7 are slidably connected to the outside of each central tube 6. The plurality of sliders 7 are respectively located on one side of the corresponding pad 3. A plurality of limit blocks 8 are fixedly provided on the side of the pad 3 away from the support plate 4. The plurality of limit blocks 8 are all provided with an inclined groove 9, and the sliders 7 extend into the inclined groove 9 and are slidably connected to the inclined groove 9. A screw rod 10 is threadedly connected to the inclined groove 9.

[0032] As attached Figure 2 、 3 As shown in Figures 5 and 6, the slider 7 is driven to move up and down on the outside of the center tube 6 by rotating the screw rod 10, and then the limit block 8 is displaced through the traction force of the slider 7 through the inclined groove 9 and the inclined surfaces of the slider 7 and the inclined groove 9, and then the pad 3 and the support plate 4 are diffused outward along the axial direction of the support tube 2, realizing the function of adjusting the coil tension, and can provide uniform and adjustable radial support force from the outside, effectively resisting the inward contraction force of the wire.

[0033] A tray 11 is provided at the bottom of the center ring 1. A plurality of offset openings 12 are provided through the tray 11. Each offset opening 12 is located below the pad 3. A vertical rod 13 is slidably connected to each of the multiple offset openings 12. Each vertical rod 13 is fixed to the bottom of the corresponding pad 3.

[0034] As attached Figure 4 、 5 As shown in FIG8 , the vertical rod 13 is slidably connected to the offset opening 12 to ensure the stability of the pad 3 when it is displaced.

[0035] A plurality of contact wheels 14 are provided on both sides of the vertical rod 13, and a dislocation cavity 21 is formed between each two adjacent contact wheels 14. The tray 11 is located in the middle of the dislocation cavity 21, and the contact wheels 14 are in contact with the tray 11.

[0036] As attached Figure 8 As shown, the vertical rod 13 is installed in the dislocation opening 12 through the dislocation cavity 21 for positioning, so that the vertical rod 13 can only move horizontally in the dislocation opening 12, ensuring the stability of the displacement of the vertical rod 13.

[0037] Side connecting rods 15 are provided on both sides of the support plate 4, and each side connecting rod 15 is provided with a transverse groove 16, and an extension plate 17 is slidably connected in each of the transverse grooves 16;

[0038] As attached Figure 1 、 2As shown in Figures 3, 4, and 4, the extension plates 17 are vertically stacked on the outside of the support plate 4 using the side connecting rods 15 as support points. The cavity formed between two adjacent extension plates 17 facilitates segmented support of the coil, thereby achieving the function of changing the tightness of the coil, further forming a combination of outer support force and axial fixed support to form an internal and external clamping effect. Combined with the winding tension and subsequent pre-pressing process, the overall tightness and radial mechanical strength of the coil can be significantly improved, making it more able to withstand short-circuit electric force during operation.

[0039] The cross-sectional shape of the multiple extension plates 17 is set to be fan-shaped, and a stopper 18 is set at one end of each extension plate 17. The multiple extension plates 17 are distributed along the axial circumference of the support tube 2, and two adjacent extension plates 17 are slidably connected;

[0040] As attached Figure 8 The extension plate 17 is connected to the transverse groove 16 in a sliding manner so that the extension plate 17 can be pulled out from the side link 15, thereby realizing the function of adjusting the length of the extension plate 17, which is easy to adapt to coils of different thicknesses. The stopper 18 abuts against the support plate 4 and is aligned with the outer side of the pad 3 to realize the function of positioning the extension plate 17.

[0041] There are several reference plates 19 distributed on the outside of the tray 11, and each reference plate 19 is located on one side of the bottom of the corresponding support plate 4;

[0042] As attached Figure 1 、 2 As shown in Figures 3, 5 and 7, the coil is positioned by the reference plate 19 in conjunction with the extension plate 17 to prevent the wire from sliding to both sides or unevenly stacking when winding a wide coil or the last few layers.

[0043] A locking sleeve 20 is provided in the middle of the center tube 6, and the locking sleeve 20 is sleeved on the outside of the support tube 2. A support ring 22 is fixedly provided at one end of the support tube 2. The screw rod 10 is located on the support ring 22 and is rotatably connected to the support ring 22.

[0044] As attached Figure 6 As shown in the slider 7, the locking sleeve 20 positions the center tube 6 to ensure the stability of the center tube 6 installed on the support tube 2, while the support ring 22 can position the screw rod 10 to ensure the stability of the screw rod 10 when rotating.

[0045] The vertical cross-sections of the inclined groove 9 and the slider 7 are both triangular, and both sides of the inner wall of the inclined groove 9 are provided with blocking rods wrapped around the outer side of the slider 7;

[0046] As attached Figure 5 and 6 As shown, through the triangular cross-section of the inclined groove 9 and the slider 7, the position of the limit block 8 can be adjusted through the inclined surface of the inclined groove 9 when the slider 7 is displaced.

[0047] The specific working principle is as follows: the screw 10 is rotated. Since the screw is threadedly connected to the inclined slot 9, and the slider 7 is embedded in the inclined slot and slidably connected to the central tube 6, the rotation of the screw 10 is converted into the up and down displacement of the slider 7 along the axial direction of the support tube 2. The slider 7 pushes the limit block 8 via the inclined surface of the inclined slot 9, driving the pad 3 and the support plate 4 to move radially outward along the support tube 2. At this time, the vertical rod 13 slides synchronously within the offset opening 12 of the tray 11. The contact wheel 14 cooperates with the offset cavity 21 to limit the displacement of the vertical rod, ensuring the smooth movement of the pad.

[0048] When the coil is wound to the outer layer, the outward expansion amplitude of the support plate 4 is adjusted by the screw rod, so that the limiting groove 5 on the surface of the support plate 4 provides continuous radial support force to the wire, offsetting the inward pressure caused by the weight of the wire and the winding tension, and maintaining the cross-sectional shape of the coil.

[0049] According to the thickness of the coil, the extension plate 17 is pulled out or pushed in along the transverse groove 16 of the side connecting rod 15. The extension plate 17 with a sector-shaped cross-section is positioned with the support plate 4 through the stopper 18. Adjacent extension plates 17 are slidably connected to form a continuous support surface, realizing layered support for the outer layer of the coil;

[0050] Furthermore, a compression spring is provided at the connection between the extension plate 17 and the side link 15, for example, a reset spring is installed at the bottom of the transverse groove 16. When the coil is pre-stressed, the extension plate can adaptively buffer to avoid damage to the wire due to rigid extrusion.

[0051] During the winding process, the reference plate 19 initially positions the wire at the bottom of the support plate 4, and the extension plate 17 forms a lateral constraint on the upper wire to prevent the wire from shifting to both sides during wide-width winding; after the winding is completed, the support assembly is retracted by the screw rod, so that the extension plate and the support plate jointly apply radial pressure to the coil, and cooperate with the pre-pressing process to further improve the tightness of the coil.

[0052] The center tube 6 is fixed to the support tube 2 through the locking sleeve 20. The support ring 22 provides a rotation fulcrum for the screw rod 10. The cooperation between the inclined groove 9 and the triangular slider 7 ensures the force transmission efficiency during the transmission process. The blocking rod wraps the slider 7 to prevent it from escaping from the inclined groove 9, and finally forms a rigid support system to ensure the stability of the mold structure and the adjustment accuracy during the winding process.

[0053] Furthermore, a servo motor is mounted on the support ring 22 and connected to the lead screw 10 via a synchronous belt. The motor encoder provides feedback on the displacement of the lead screw 10. When winding the high-voltage coil of the transformer, the encoder is used to set the inner layer support force, the middle layer, and the gradient parameters of the outer layer. This allows the system to automatically trigger the motor to adjust the lead screw 10 according to the number of winding layers. After winding is completed, the segmented pre-stressing program is initiated. A worm gear mechanism or ratchet and pawl assembly is added to the end of the lead screw 10 to prevent the lead screw from rotating due to tension fluctuations during the winding process, ensuring constant support force. For example, a worm gear meshing with the lead screw can be installed on the support ring 22, and manual locking can be achieved using a worm handle.

[0054] Furthermore, a strain gauge tension sensor is embedded inside the support plate 4 or extension plate 17 to monitor the wire tension in real time and provide feedback to the screw drive system. For example, when the tension exceeds a threshold, the PLC controller automatically adjusts the screw speed and the supporting force simultaneously, forming a closed-loop control.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A simple winding die for an oil-immersed power transformer, including a center ring, characterized by: A support assembly is provided on the center ring; The support assembly includes a support cylinder arranged at the top of the center ring, a plurality of pads are distributed on the outside of the support cylinder, and a supporting plate is provided on one side of each pad, and a limiting groove is provided on the surface of the plurality of supporting plates; Two center cylinders are sleeved on the outside of the support cylinder, and a plurality of sliders are slidably connected to the outside of each center cylinder, and the plurality of sliders are respectively located on one side of the corresponding pad, and a plurality of limit blocks are fixedly provided on the side of the pad away from the support plate, and the plurality of limit blocks are provided with an oblique groove, and the sliders extend into the oblique groove and are slidably connected to the oblique groove, and a screw rod is threadedly connected to the oblique groove; A tray is provided at the bottom of the center ring, and a plurality of staggered openings are opened on the tray, and each of the staggered openings is respectively located below the pad, and a vertical rod is slidably connected in each of the plurality of staggered openings, and each of the vertical rods is respectively fixed to the bottom of the corresponding pad; Side connecting rods are respectively provided on both sides of the support plate, and each of the side connecting rods is provided with a transverse groove, and an extension plate is respectively slidably connected in a plurality of the transverse grooves; The cross-sectional shape of the plurality of extension plates is set to be fan-shaped, and a stopper is provided at one end of each extension plate. The plurality of extension plates are distributed along the axial circumference of the support tube, and two adjacent extension plates are slidably connected; A plurality of reference plates are distributed on the outside of the tray, and each reference plate is located on one side of the bottom of the corresponding support plate; A locking sleeve is provided in the middle of the central tube, and the locking sleeve is sleeved on the outside of the support tube. A support ring is fixedly provided at one end of the support tube, and the screw rod is located on the support ring and is rotatably connected to the support ring; The vertical cross-sections of the inclined groove and the slider are both triangular, and blocking rods wrapped around the outside of the slider are provided on both sides of the inner wall of the inclined groove.

2. The simple winding die for an oil-immersed power transformer according to claim 1, characterized in that: A plurality of interference wheels are respectively provided on both sides of the vertical rod, and a dislocation cavity is formed between each two adjacent interference wheels. The tray is located in the middle of the dislocation cavity, and the interference wheels are in contact with the tray.

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