Winding body of high-voltage winding

Abstract

The utility model discloses a winding body of a high-voltage winding, the winding body is used for winding a wire to form a high-voltage coil, the winding body comprises a plurality of winding plates, the winding plates are distributed in the circumferential direction of the winding body, the length directions of the winding plates are arranged in the axial direction of the winding body, and the winding plates are provided with a plurality of winding grooves to enable the winding plates to form a plurality of comb teeth; the radial length of the comb teeth at the end parts of the winding plates and the comb teeth at the middle parts of the winding plates along the winding body is smaller than the length of the comb teeth at other parts; a cushion block is arranged in each winding groove in at least two adjacent winding plates, the length direction of the cushion blocks is arranged in the circumferential direction of the winding body, and the cushion blocks are located in the middles of the comb teeth. The auxiliary parts are annular and are arranged at intervals in the axial direction of the winding body, and the winding plates are fixedly connected with the auxiliary parts. According to the high-voltage winding, the cushion blocks are arranged to form the mounting space of the air channel piece between the two adjacent winding plates, so that the air channel is formed, the heat dissipation performance of the high-voltage winding is improved, and the cost is saved.

Description

Technical Field

[0001] This application relates to the field of power transformer technology, and in particular to a winding body for a high-voltage winding. Background Technology

[0002] Transformers can currently be classified into three types: oil-immersed transformers, dry-type transformers, and gas-fired transformers. Dry-type transformers offer advantages such as being oil-free, fire-resistant, having a long lifespan, being energy-efficient and low-noise, easy to maintain, and safe and reliable. Most dry-type transformers currently on the market are either resin-cast high-voltage windings or open-type. Although dry-type transformers have seen significant development in the past decade, problems such as insulation cracking, poor thermal conductivity, and harsh operating environments still exist during operation.

[0003] Currently, dry-type transformers typically use rigid comb plates as the winding structure for their disc-shaped high-voltage windings. A winding slot is formed between any two adjacent comb teeth. Winding generally begins from one end of the rigid comb plate. The designed number of turns is wound in the first winding slot of the rigid comb plate according to the disc-shaped winding method, forming the first disc coil. The second disc coil is then wound in the same or the next winding slot until all coils are wound. Because disc-shaped coils typically require one disc coil to be completed before the next can be wound, it is difficult to install cooling air channels inside the disc coil to dissipate heat from the high-voltage winding. A common solution to this problem is to use larger gauge wires to prevent coil overheating from affecting the high-voltage winding performance. However, this method increases the amount of core and wire used, increases the product size, and consequently increases production and installation costs, causing the product to lose its competitive advantage. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this application is to provide a high-voltage winding body that forms an air duct installation space between two adjacent winding plates by setting a pad, thereby improving the heat dissipation performance of the high-voltage winding and saving costs.

[0005] To achieve the above objectives, the technical solution adopted in this application is: a high-voltage winding body for winding conductors to form a high-voltage coil. The winding body includes: a plurality of winding plates distributed circumferentially along the winding body, the length direction of the plurality of winding plates being arranged along the axial direction of the winding body, a plurality of winding grooves being provided on the winding plates to form a plurality of comb teeth, the comb teeth at the ends of the winding plates and the comb teeth in the middle of the winding plates having a radial length less than the length of the comb teeth in other parts; a pad is provided in each winding groove of at least two adjacent winding plates, the length direction of the pad being arranged along the circumferential direction of the winding body, and the pad being located in the middle of the comb teeth; a plurality of auxiliary components, the plurality of auxiliary components being annular and spaced apart along the axial direction of the winding body, and the plurality of winding plates being fixedly connected to the auxiliary components.

[0006] The winding plate is mounted on the inner circumference of the auxiliary component. The auxiliary component includes two first auxiliary components and at least one second auxiliary component. The first auxiliary component is mounted on the end of the winding plate, and the second auxiliary component is mounted on the middle of the winding plate.

[0007] Among them, several first grooves are provided on one side plate of the two first auxiliary components, and the several first grooves are correspondingly provided with several winding plates to accommodate the comb teeth at the end of the winding plates.

[0008] Among them, a limiting block is provided between two adjacent comb teeth at the end of the winding plate, and several second grooves are provided on the other side plate of the first auxiliary component. The several second grooves are correspondingly provided with several winding plates and are used to engage with the limiting block.

[0009] The length of the second groove along the radial direction of the first auxiliary component corresponds to the length of the limiting block along the radial direction of the winding body; the width of the second groove along the circumferential direction of the first auxiliary component matches the width of the limiting block along the circumferential direction of the winding body; the depth of the second groove along the axial direction of the first auxiliary component matches the height of the limiting block along the axial direction of the winding body; the distance between the comb teeth at the end of the winding plate and the adjacent limiting block is equal to the distance between the bottom of the first groove and the second groove on the first auxiliary component.

[0010] The pad is attached to the middle of the comb teeth.

[0011] The comb teeth are provided with L-shaped grooves on both sides. The two L-shaped grooves are arranged opposite each other and are symmetrically distributed along the length of the winding plate, so that two limiting steps are formed on both sides of the middle part of the comb teeth.

[0012] The pad has a mounting groove in the middle of one side, which is set along the radial direction of the winding body. The pad is locked onto the limiting step of the comb teeth through the mounting groove.

[0013] The height of the mounting groove on the pad is slightly less than or equal to the width of the winding groove along the axial direction of the winding body.

[0014] Among them, the other side of the winding plate without comb teeth is provided with several support parts, which are arranged radially along the winding body and distributed at intervals along the axial direction of the winding body.

[0015] The beneficial effects of this application are as follows: Unlike the prior art, this application forms an installation space for the air passage component by setting a pad between two adjacent winding plates, so as to form an air passage, improve the heat dissipation performance of the high voltage winding, save manufacturing and installation costs, and enhance the competitive advantage of the product; the pad can also provide a certain support for the wires in the winding slot, further ensuring that the wires are wound securely.

[0016] Meanwhile, by setting the length of the comb teeth at the end of the winding board to be smaller, this application can save materials and reduce costs while ensuring the strength of the winding board; by setting the length of the comb teeth in the middle of the winding board to be smaller, space can be left for the taps led out from the middle of the winding board. Attached Figure Description

[0017] Figure 1 This is a front view of a dry-type transformer 10 according to one embodiment of this application;

[0018] Figure 2 This is a top view of a dry-type transformer 10 according to one embodiment of this application;

[0019] Figure 3 This is a front view of the assembled iron core 110 according to one embodiment of this application;

[0020] Figure 4 yes Figure 2 Enlarged view of point G in the middle;

[0021] Figure 5 This is a three-dimensional schematic diagram of the winding body 1310 according to an embodiment of this application;

[0022] Figure 6 This is a perspective view of the winding board 1313 according to one embodiment of this application;

[0023] Figure 7 This is a perspective view of the first auxiliary component 13111 according to an embodiment of this application;

[0024] Figure 8 This is a perspective view of the second auxiliary component 13112 according to an embodiment of this application;

[0025] Figure 9 This is a perspective view of the pad 1410 according to one embodiment of this application;

[0026] Figure 10 This is a perspective view of the pad 1410 according to another embodiment of this application;

[0027] Figure 11 This is a three-dimensional schematic diagram of a high-voltage coil 1320 wound on a winding body 1310 according to an embodiment of this application;

[0028] Figure 12 This is a perspective view of the high-voltage winding 130 according to one embodiment of this application;

[0029] Figure 13 This is a simplified circuit diagram of the high-voltage coil 1320 according to one embodiment of this application;

[0030] Figure 14 This is a partial cross-sectional view of the high-voltage winding 130 according to one embodiment of this application. Detailed Implementation

[0031] As requested, specific embodiments of this application are disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of this application and may be embodied in various forms. Therefore, the specific details disclosed herein are not intended to be limiting, but merely to serve as the basis for the claims and as a representative basis for teaching those skilled in the art to apply this application differently in practice in any appropriate manner, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0032] The term "connection" as used in this application, unless otherwise explicitly specified or limited, should be interpreted broadly, encompassing both direct connection and connection via an intermediate medium. In the description of this application, it should be understood that the orientation or positional relationship indicated by terms such as "upper," "lower," "end," and "one end" is based on the orientation or positional relationship shown in the accompanying drawings and is used solely for the convenience of describing this application and for simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0033] like Figures 1-3 As shown, the dry-type transformer 10 is a three-phase transformer, consisting of phase A, phase B, and phase C, meaning it comprises three single-phase transformers 100. Depending on the structure of the core 110, the three transformers 100 can be arranged in a linear or triangular configuration, and they can also be symmetrical. Furthermore, this dry-type transformer 10 can also be an isolation transformer, a frequency converter, a test transformer, etc.

[0034] In one embodiment, see further. Figures 1-3, three transformers 100 are arranged to form a linear structure. The dry-type transformer 10 includes an iron core 110, three low-voltage windings 120, and three high-voltage windings 130. The iron core 110, the low-voltage windings 120, and the high-voltage windings 130 are arranged in sequence from the inside to the outside. The iron core 110 includes three columnar iron core bodies 111, an upper yoke 112 located at the upper ends of the three columnar iron core bodies 111, and a lower yoke 113 located at the lower ends of the three columnar iron core bodies 111. The three low-voltage windings 120 are respectively sleeved on the outer peripheries of the three columnar iron core bodies 111, and the three high-voltage windings 130 are respectively sleeved on the outer peripheries of the three low-voltage windings 120, that is, the three columnar iron core bodies 111, the three low-voltage windings 120, and the three high-voltage windings 130 are sleeved in sequence from the inside to the outside in one-to-one correspondence. The columnar iron core body 111 is formed by stacking multiple layers of silicon steel sheets, and is fixed by tying with a binding tape outside the multiple layers of silicon steel sheets. The radial cross-section of the columnar iron core body 111 is generally oval or circular or other shapes, as long as it can be accommodated in the hollow cavity of the low-voltage winding 120, and there is no limitation here. The upper yoke 112 and the lower yoke 113 are also formed by stacking multiple layers of silicon steel sheets to fixedly connect the three columnar iron core bodies 111, thereby forming a three-phase iron core 110 as shown in Figure 3 shown.

[0035] Combined with Figure 1 and Figure 2 shown, an iron core clamp 140 is provided on the outer side of the iron core 110. The iron core clamp 140 is formed by connecting three clamps to form a structure similar to a channel steel, that is, the iron core clamp 140 as a whole has a "C" - shaped structure. Of course, in other embodiments, the iron core clamp can also be a hollow pipe fitting, that is, the iron core clamp is formed by connecting several clamp pieces of plate structures and surrounding them to form a closed structure, making the structure of the iron core clamp more stable.

[0036] Among them, the iron core clamp 140 is made of a fiber-reinforced composite material. Specifically, it can be formed by impregnating glass fiber with epoxy resin by molding, or by impregnating aramid fiber with epoxy resin by molding, and other composite materials can also be integrally formed, and there is no limitation here.

[0037] The fiber-reinforced composite material refers to a composite material formed by an enhanced fiber material, such as glass fiber, aramid fiber, etc., and a matrix material through forming processes such as winding, molding, or pultrusion. The iron core clamp 140 made of the fiber-reinforced composite material has low cost, light weight, good mechanical properties, and low carbon emission during the production process of the fiber-reinforced composite material, and is more green and more environmentally friendly.

[0038] Combined with Figure 2 and Figure 4As shown, the low-voltage winding 120 includes copper foil 121, a low-voltage insulation layer 122, and support bars 123, with the copper foil 121 and the low-voltage insulation layer 122 alternately arranged. Specifically, the copper foil 121 is formed by winding a whole sheet of copper foil, and the low-voltage insulation layer 122 is overlapped with the copper foil 121 and wound together. The low-voltage winding 120 is provided with at least one heat dissipation channel, which is located between adjacent copper foils 121 and low-voltage insulation layers 122, and the support bars 123 are located within the heat dissipation channel, used to support and isolate adjacent copper foils 121 and low-voltage insulation layers 122. The support bars 123 are insulating support bars 123, and multiple insulating support bars 123 are provided in each heat dissipation channel. The multiple insulating support bars 123 are arranged circumferentially along the outer periphery of the copper foil 121, and at intervals, simultaneously serving to support adjacent copper foils 121 and low-voltage insulation layers 122. Each heat dissipation duct contains at least two, and may contain two, three, four, or more insulating support strips 123. Preferably, multiple insulating support strips 123 in the same layer are evenly spaced along the circumferential direction of the outer periphery of the copper foil 121. The heat dissipation duct can release the heat generated by the low-voltage winding 120 during the operation of the dry-type transformer 10, preventing overheating failure. The heat dissipation duct can be provided in one layer, or in two or more layers; no limitation is imposed here.

[0039] Among them, the low-voltage insulation layer 122 is made of polyimide impregnated paper, specifically SHS-P diphenyl ether prepreg material, which is made by impregnating polyimide film and polysulfone fiber nonwoven soft composite material with diphenyl ether resin and then baking. Of course, the low-voltage insulation layer can also be made of DMD insulation paper or silicone rubber film, or other insulation materials, depending on the insulation heat resistance level of the dry-type transformer.

[0040] The insulating support strip 123 is made of glass fiber impregnated with epoxy resin or aramid fiber impregnated with epoxy resin, without limitation. Furthermore, the insulating support strip 123 is an I-shaped strip for better mechanical stability. Of course, the insulating support strip can also be a square or other shaped strip, as long as it serves a supporting and insulating function.

[0041] like Figures 5-14 As shown, the high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320, and a high-voltage insulation layer 1330. Conductors are wound around the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 includes a winding portion 1312, in which conductors are wound to form the high-voltage coil 1320. The high-voltage coil 1320 includes several coil segments, which are spaced apart along the axial direction of the winding body 1310.

[0042] The winding section 1312 includes a plurality of winding plates 1313. The winding plates 1313 are arranged along the axial direction of the winding body 1310 and are evenly distributed circumferentially along the winding body 1310. A plurality of winding grooves 1314 are provided on each winding plate 1313, forming a plurality of comb teeth on one side of each plate for winding conductors. The number of winding plates 1313 is at least two, but can be two, three, or more; no limitation is made here. To ensure secure conductor winding and to save material as much as possible, the number of winding plates 1313 in the 10kV / 1000kVA dry-type transformer is set to twelve.

[0043] The winding plate 1313 is a rectangular plate. The longer side of the winding plate 1313 is arranged along the axial direction of the winding body 1310. Several winding slots 1314 on the winding plate 1313 are arranged radially along the winding body 1310 and spaced apart along the axial direction of the winding body 1310, so that several comb teeth are formed on one side of the winding plate 1313. The height of the comb teeth on the winding plate 1313 along the axial direction of the winding body 1310 is defined as the tooth height. The tooth height of the comb teeth in the middle of the winding plate 1313 is greater than the tooth height of the comb teeth in other parts. This is because the tap joint of the tap connector needs to be led out from the middle of the winding plate 1313. Setting the tooth height in the middle of the winding plate 1313 to be larger will result in a larger distance between two adjacent winding slots 1314, which can leave space for the tap joint led out from the middle of the winding plate 1313. Furthermore, the comb teeth at the end and in the middle of the winding plate 1313 have a radial length less than that of the comb teeth in other parts of the winding body 1310. Setting the length of the comb teeth at the end of the winding plate 1313 to be smaller can save materials and reduce costs while ensuring the strength of the winding plate 1313. Setting the length of the comb teeth in the middle of the winding plate 1313 to be smaller can leave space for the taps led out from the middle of the winding plate 1313.

[0044] At least one coil segment is provided between two adjacent comb teeth on the winding plate 1313, so that each winding slot 1314 is wound with a wire, and the high-voltage coils 1320 are reasonably distributed, with each coil segment spaced apart. Specifically, when several winding plates 1313 are evenly distributed circumferentially, the winding slots 1314 on all winding plates 1313 correspond one-to-one with the winding body 1310 circumferentially. Each coil segment is wound with a wire along the circumference of the winding body 1310 in the corresponding winding slot 1314 on all winding plates 1313, resulting in balanced force and good mechanical strength.

[0045] In other embodiments, to allow for the placement of the taps, the winding plates can be arranged unevenly. For example, the distance between two adjacent winding plates may be greater than the distance between any other two adjacent winding plates. In this case, each tap is led out from between the two adjacent winding plates. Thus, the tooth height of the comb teeth in the middle of the winding plate does not need to be set to be larger, and the placement position of each tap can still be left.

[0046] At least two adjacent winding plates 1313 each winding slot 1314 are provided with a pad 1410 for preparing a high-voltage winding 130 with an air passage. The length direction of the pad 1410 is arranged along the circumference of the winding body 1310, and the pad 1410 is located in the middle of the comb teeth in the length direction of the comb teeth. It is used to separate the wires on the comb teeth to form an installation space for the air passage component. That is, when the wires are wound in the winding slot 1314 with the pad 1410, they can be separated by the pad 1410, thereby forming an installation space for the air passage component between two adjacent winding plates 1313. This allows the air passage component to occupy a certain space to form an air passage during the subsequent injection molding process of the high-voltage insulation layer 1330, thereby improving the heat dissipation performance of the high-voltage winding 130. Compared with a high-voltage winding of the same voltage level but without an air passage, the high-voltage winding 130 of this application does not need to use larger gauge wires to avoid heat generation, and the amount of iron core does not need to be increased. This can save manufacturing and installation costs and improve the competitive advantage of the product. In addition, the pad 1410 can also provide some support for the wires in the winding groove 1314, further ensuring that the wires are wound securely.

[0047] The air duct component can be an air duct plate, air duct tube, air duct rod, or other structure, as long as it occupies a certain space in the corresponding installation space formed by the pad 1410, facilitating the subsequent formation of the air duct. The cross-sectional shape of the air duct component can be selected according to the air duct structure design and is not specifically limited here. It is understood that when the air duct component is a solid structure such as an air duct rod or air duct plate, the air duct component can be pulled out to form the air duct after the high-voltage insulation layer 1330 is formed; when the air duct component is a through-hole hollow structure such as an air duct tube, the air duct can be formed directly without pulling out the air duct tube after the high-voltage insulation layer 1330 is injected.

[0048] like Figure 9 As shown, the pad 1410 can be an arc-shaped block, and the curvature of the pad 1410 matches the circumferential surface of the winding body 1310. Thus, when the length direction of the pad 1410 is arranged along the circumferential direction of the winding body 1310, the inner side of the pad 1410 near the bottom of the comb teeth and the outer side away from the bottom of the comb teeth both match the circumferential surface of the winding body 1310, ensuring that the circumferential direction of the coil on both the inner and outer sides of the pad 1410 remains consistent, guaranteeing balanced force on the coil, thereby ensuring the quality of the high-voltage winding 130. In other embodiments, the pad can also be a cuboid structure, as long as it can form an installation space for the air duct component; no specific limitations are imposed here.

[0049] In this embodiment, the pad 1410 is snapped into the middle of the comb teeth, allowing the pad 1410 to be securely positioned within the winding groove 1314. Specifically, the comb teeth on the winding plate 1313 where the pad 1410 is to be installed have L-shaped grooves 1411 on both sides. The two L-shaped grooves 1411 are arranged opposite to each other and symmetrically distributed along the length of the winding plate 1313, making the cross-section of the comb teeth along the radial direction of the winding body 1310 convex. This forms two limiting steps 1412 on both sides of the middle of the comb teeth for installing the pad 1410. Correspondingly, the middle of one side of the pad 1410 has an installation groove 1413, which is arranged radially along the winding body 1310. The pad 1410 is snapped into the limiting steps 1412 of the comb teeth through the installation groove 1413, thus allowing the pad 1410 to be securely snapped into the middle of the comb teeth.

[0050] The height of the pad 1410 along the axial direction of the winding body 1310 is defined as the height of the pad 1410, the width of the pad 1410 along the radial direction of the winding body 1310 is defined as the width of the pad 1410, and the length of the pad 1410 along the circumferential direction of the winding body 1310 is defined as the length of the pad 1410. The height of the mounting groove 1413 on the pad 1410 can be set to be slightly less than or equal to the width of the winding groove 1314 along the axial direction of the winding body 1310. This ensures that the pad 1410 can be accommodated in the winding groove 1314 after being engaged on the comb teeth, thus ensuring the support effect for the wires in the winding groove 1314. The width of the pad 1410 is directly related to the radial width of the air passage installation space formed along the winding body 1310, and can be adjusted according to the air passage design requirements of the high-voltage winding 130. The length of the pad 1410 can be adjusted according to the support requirements of the wires and the installation requirements of the air passage, as long as the pads 1410 installed on two adjacent winding plates 1313 do not interfere with each other, and no specific restrictions are imposed here.

[0051] Furthermore, the bottom walls of the mounting groove 1413 on the pad 1410 can be rounded at both ends to facilitate assembly of the pad 1410 with the winding plate 1313. Rounded corners can also be provided at both ends of the pad 1410 along its length to prevent the edges from being too sharp and damaging the insulation layer on the conductor surface, thus affecting the insulation performance of the high-voltage winding 130. Additionally, chamfered corners can be provided on both sides of the pad 1410 along its length to facilitate the flow of silicone rubber during subsequent injection molding, ensuring the uniformity and stability of the high-voltage insulation layer 1330, thereby guaranteeing the quality of the high-voltage winding 130.

[0052] Furthermore, such as Figure 10As shown, the pad 1410 may have a cross-line groove 1414 on the other side where the mounting groove 1413 is not provided. The cross-line groove 1414 is inclined so that the bottom side of one end of the pad 1410 forms an inlet 1415 and the top side of the other end of the pad 1410 forms an outlet 1416, so that the wire can pass through the inside of the pad 1410 and be wound around to the outside of the pad 1410.

[0053] The dimensions of the inlet 1415 and outlet 1416 can be larger than the cross-sectional dimensions of the wire. This facilitates the wire entering through the inlet 1415, passing through the cross-connection groove 1414, and exiting through the outlet 1416, resulting in simple operation and high efficiency. Furthermore, the positions of the inlet 1415 and outlet 1416 can be specifically configured such that the inlet 1415 is located on the inner side of one end of the pad 1410 near the bottom of the comb teeth, and the outlet 1416 is located on the outer side of the other end of the pad 1410 away from the bottom of the comb teeth, allowing the cross-connection groove 1414 to extend obliquely from the inner side of the pad 1410 to the outer side of the pad 1410; or, the inlet 1415 is located on the bottom side of the end face of one end of the pad 1410, and the outlet 1416 is located on the top side of the end face of the other end of the pad 1410, allowing the cross-connection groove 1414 to extend obliquely from the inner side of the pad 1410 to the outer side of the pad 1410. The end face extends obliquely to the other end face of the pad 1410; or, the inlet 1415 is located on the inner side of one end of the pad 1410 near the bottom of the comb teeth, and the outlet 1416 is located on the top side of the end face of the other end of the pad 1410, so that the cross-line groove 1414 extends from the inner side of the pad 1410 to the other end face of the pad 1410; or, the inlet 1415 is located on the bottom side of the end face of one end of the pad 1410, and the outlet 1416 is located on the outer side of the other end of the pad 1410 away from the bottom of the comb teeth. As long as the transition winding of the wire can be achieved, no specific restrictions are made here.

[0054] The depth of the cross-slot 1414 along the axial direction of the winding body 1310 is defined as the depth of the cross-slot 1414, and the width of the cross-slot 1414 along the radial direction of the winding body 1310 is defined as the width of the cross-slot 1414. The width of the conductor along the axial direction of the winding body 1310 is defined as the width of the conductor, and the thickness of the conductor along the radial direction of the winding body 1310 is defined as the thickness of the conductor. The depth of the cross-slot 1414 matches the width of the conductor, and the width of the cross-slot 1414 matches the thickness of the conductor. In one application scenario, a disc coil is set in each winding slot 1314. The depth of the cross-slot 1414 can be set to be slightly larger than or equal to the width of the conductor, and the width of the cross-slot 1414 can be set to be slightly larger than or equal to the thickness of the conductor. This facilitates the threading of the conductor in the winding slot 1414 and improves the efficiency of the cross-slot operation.

[0055] Furthermore, notches 1418 may be provided at both ends of the pad 1410, so that after the wire has been wound a set number of turns in a certain winding groove 1314, it can be guided from the notch 1418 into the next adjacent winding groove to continue winding without interference from the pad 1410 in that winding groove 1314. The shape and size of the notch 1418 can be designed according to the winding requirements, and no specific restrictions are imposed here.

[0056] Furthermore, on the other side of the winding plate 1313 without comb teeth, several support portions 1315 are provided to abut against the winding fixture. That is, the support portions 1315 and the comb teeth are located on opposite sides of the winding plate 1313, and the several support portions 1315 are arranged radially along the winding body 1310 and spaced apart axially along the winding body 1310. The several support portions 1315 abut against the outer peripheral surface of the winding fixture, so that under the high temperature conditions of injection molding high voltage insulation layer 1330, the winding plate 1313 will not soften and deform due to high temperature, resulting in the high voltage coil 1320 lacking support, effectively avoiding the high voltage coil 1320 from inward deformation, and ensuring the quality of high voltage winding 130. Furthermore, the support portion 1315 allows the distance between the bottom surface of the winding groove 1314 of the winding plate 1313 and the side of the winding plate 1313 without comb teeth to meet the strength design requirements without needing to be large. This reduces the space required for the winding portion 1312, thereby reducing the amount of wire used in the high-voltage coil 1320 and the amount of silicone rubber used in the high-voltage insulation layer 1330, effectively reducing costs. Moreover, the size of the high-voltage winding 130 of the same voltage level can also be smaller, saving floor space.

[0057] The width of the support portion 1315 on the winding plate 1313 along the axial direction of the winding body 1310 is defined as the width of the support portion 1315. The widths of the support portions 1315 at both ends of the winding plate 1313 and the width of the support portion 1315 in the middle of the winding plate 1313 are greater than the widths of the support portions 1315 in other parts of the winding plate 1313. This is because the ends of the winding plate 1313 need to be slotted to be fixed with the auxiliary component 1311. Setting the width of the support portion 1315 at the ends of the winding plate 1313 to be larger ensures that the slotting at the ends of the winding plate 1313 does not weaken its mechanical strength, and the support portion 1315 can provide sufficient support for the ends of the high-voltage coil 1320. For example, the support portion 1315 can be set to be connected to the winding groove 1 at the ends of the winding plate 1313. Position 314 corresponds to the support portion 1315, and one end of the support portion 1315 extends to be flush with the end face of the winding plate 1313. Since the tooth height of the comb teeth in the middle of the winding plate 1313 is relatively large, the distance between two adjacent winding slots 1314 is also relatively large. Setting the width of the support portion 1315 in the middle of the winding plate 1313 to be larger can ensure that the support portion 1315 can provide sufficient support for the middle of the high voltage coil 1320. For example, the support portion 1315 can be set to correspond to the position of two adjacent winding slots 1314 in the middle of the winding plate 1313, that is, the width of the support portion 1315 can cover the two adjacent winding slots 1314.

[0058] Simultaneously, the area containing the wider support portion 1315 is defined as the wide support area, and the area containing the narrower support portion 1315 is defined as the narrow support area. Through this arrangement, the winding plate 1313, along the axial direction of the winding body 1310 from one end to the other, sequentially forms a first wide support area, a first narrow support area, a second wide support area, a second narrow support area, and a third wide support area. Furthermore, the first wide support area and the third wide support area are symmetrically arranged about the second wide support area, and the first narrow support area and the second narrow support area are symmetrically arranged about the second wide support area. This makes the support of each support portion 1315 on the high-voltage coil 1320 more uniform and stable. Of course, asymmetrical arrangements are also possible; no specific restrictions are placed here.

[0059] Furthermore, at least a portion of the support portion 1315 is correspondingly disposed with the winding groove 1314. In one application scenario, each support portion 1315 in this part is correspondingly disposed with one winding groove 1314. For ease of description, the support portion 1315 in this part is defined as the first support portion, that is, this part of the support portion 1315 includes several first support portions. Each first support portion is disposed on the other side of the winding plate 1313 without comb teeth and is located between the extension lines of its corresponding two adjacent comb teeth. The width of each first support portion is approximately equal to the width of its corresponding winding groove 1314 along the axial direction of the winding body 1310. For example, the first narrow support area and the second narrow support area on the winding plate 1313 are both provided with first support portions in the above manner, so that the two areas can better support their corresponding coil segments through the first support portions, further avoiding the inward deformation of the high-voltage coil 1320. It is understood that the number and placement area of ​​the first support portions are not specifically limited.

[0060] In another application scenario, at least a portion of the support portion 1315 is correspondingly disposed with at least two adjacent winding slots 1314. Each support portion 1315 in this portion is correspondingly disposed with at least two adjacent winding slots 1314. For ease of description, the support portion 1315 in this portion is defined as a second support portion, that is, this portion of the support portion 1315 includes a plurality of second support portions. Each second support portion is disposed on the other side of the winding plate 1313 without comb teeth and is located between the extension lines of the comb teeth at both ends of its corresponding plurality of winding slots 1314. The width of each second support portion is approximately equal to the sum of the width of its corresponding plurality of winding slots 1314 along the axial direction of the winding body 1310 and the tooth height of the comb teeth between its corresponding plurality of winding slots 1314. For example, one second support portion is disposed corresponding to two adjacent winding slots 1314. The second support portion is located between its corresponding two The second support portion is positioned between the extended lines of the comb teeth at both ends of each winding groove 1314, and the width of the second support portion is approximately equal to the sum of the width of the two winding grooves 1314 along the axial direction of the winding body 1310 and the tooth height of the comb teeth between the two winding grooves 1314. Alternatively, a second support portion may be provided for three adjacent winding grooves 1314, located between the extended lines of the comb teeth at both ends of the three corresponding winding grooves 1314, and the width of the second support portion is approximately equal to the sum of the width of the three winding grooves 1314 along the axial direction of the winding body 1310 and the tooth height of the two comb teeth between the three winding grooves 1314. The first wide support area, the second wide support area, and the third wide support area are all configured in the above manner, so that these three areas can better support the two ends and the middle of the high-voltage coil 1320 through the second support portion, further preventing the high-voltage coil 1320 from inward deformation. It is understood that the number and placement area of ​​the second support portions can be designed according to specific needs and are not specifically limited here.

[0061] Furthermore, on each winding plate 1313, a support portion 1315 is provided for each pair of adjacent winding slots 1314. For example, one support portion 1315 is provided for every two adjacent winding slots 1314, or one support portion 1315 is provided for every three adjacent winding slots 1314. This reduces the number of support portions 1315, ensuring effective support for the high-voltage coil 1320 while simplifying the structure of the winding plate 1313 and facilitating manufacturing. The width and specific location of the support portion 1315 can be adjusted according to support requirements and are not specifically limited here.

[0062] With the above configuration, the support portions 1315 on each winding plate 1313 are generally serrated. When the winding portion 1312 is fixed on the winding fixture and the support portion 1315 abuts against the outer peripheral surface of the winding fixture, several spaced channels will be formed between the winding plate 1313 and the outer peripheral surface of the winding fixture. These channels can be used to flow the injected silicone rubber material, making the injection effect more uniform and efficient. At the same time, compared with the winding plate without support portions 1315, the side without comb teeth abuts against the outer peripheral surface of the winding fixture. The winding plate may be damaged due to directly bearing a large injection pressure. However, during the injection process, the silicone rubber material of the winding plate 1313 can flow from one side of the winding plate 1313 to the other side through the channels, effectively buffering the impact of the silicone rubber material on the winding plate 1313 and preventing the winding plate 1313 from being damaged by a large injection pressure.

[0063] Furthermore, the support portion 1315 is smoothly connected to the winding plate 1313. That is, the cross-section of each support portion 1315 along the radial direction of the winding body 1310 is approximately trapezoidal. The lower base of the trapezoid is connected to the side of the winding plate 1313, so that the waist of the trapezoid and the side of the winding plate 1313 are smoothly transitioned. This can improve the connection strength between the support portion 1315 and the winding plate 1313. It can also prevent the mechanical strength of the winding plate 1313 from being weakened when the width of the support portion 1315 is smaller than the width of the corresponding winding groove 1314. This would prevent the winding plate 1313 from being damaged due to the large injection pressure during the injection of the high-voltage insulation layer 1330.

[0064] In this embodiment, the winding plate 1313 is made of glass fiber impregnated with epoxy resin. Multiple layers of glass fiber cloth impregnated with epoxy resin are stacked to a certain thickness, then molded and cured to form a rectangular fiberglass plate. The winding groove 1314 and support portion 1315 are then machined to form the winding plate 1313. This method uses minimal material and saves costs. In other embodiments, a comb-shaped winding plate can also be integrally cast and cured to directly form the winding plate, simplifying the process. The material of the winding plate is the same as described above and will not be repeated.

[0065] The winding body 1310 also includes several auxiliary components 1311, which are arranged in a ring shape and spaced apart along the axial direction of the winding body 1310. The auxiliary components 1311 are snapped together with the winding plate 1313. This winding body 1310 eliminates the structure of a rigid insulating inner liner, resulting in better heat conduction of the high-voltage winding 130. It also eliminates the interface between the high-voltage insulation layer and the rigid insulating inner liner of the traditional high-voltage winding, thereby suppressing surface discharge of the rigid insulating inner liner, saving materials, and reducing costs.

[0066] The winding plate 1313 is fixedly disposed on the inner circumference of several auxiliary components 1311 along the axial direction of the auxiliary components 1311, so that the winding plate 1313 connects all the auxiliary components 1311 simultaneously, and the several winding plates 1313 are evenly distributed along the circumference of the auxiliary components 1311. The axial directions of the auxiliary components 1311, the winding portion 1312, the winding body 1310, and the high-voltage winding 130 are all in the same direction. The auxiliary component 1311 can be circular or elliptical, depending on the overall shape of the high-voltage winding 130. The auxiliary component 1311 can maintain the stable setting of the winding plate 1313, preventing the winding plate 1313 from moving or misaligning during the wire winding process and the injection of the high-voltage insulation layer 1330, which would cause the high-voltage coil 1320 to shift and affect the quality of the high-voltage winding 130. Furthermore, compared to a winding structure that fixes the winding plate to the outside of the auxiliary component, in this application, the winding plate 1313 is fixed to the inside of the auxiliary component 1311, and the tension force of the wire winding can hold all the winding plates 1313 in place. When the outer periphery of the winding fixture is tightened to the theoretical position, there is no need for auxiliary parts 1311 to provide corresponding support. Therefore, it is not necessary to grind each auxiliary part 1311 with the winding fixture to achieve a stable assembly of the winding plate 1313 and the auxiliary parts 1311. This greatly saves labor, improves assembly efficiency, and effectively prevents the winding part 1312 from moving around on the surface of the winding fixture. This prevents the high-voltage coil 1320 from deforming due to uneven injection pressure, thus ensuring the quality of the high-voltage winding 130.

[0067] The auxiliary component 1311 and the winding plate 1313 are respectively provided with corresponding slots, and the two are connected by engaging with each other through the matching slots. The inner surface of the auxiliary component 1311 is provided with a plurality of first slots 1316, which are evenly arranged along the circumference of the auxiliary component 1311, and the number of first slots 1316 is equal to the number of winding plates 1313; the winding plates 1313 are provided with a plurality of second slots 1317 on the side where the comb teeth are provided, which are spaced apart along the length of the winding plates 1313, and the number of second slots 1317 is equal to the number of auxiliary components 1311; the winding plates 1313 are respectively engaged in the first slots 1316 of the auxiliary components 1311 through the second slots 1317, so that the winding plates 1313 are evenly distributed circumferentially on the inner circumference of the auxiliary components 1311. Meanwhile, the first slots 1316 on all auxiliary components 1311 are matched one-to-one in the axial direction of the auxiliary component 1311, so that each winding plate 1313 can be set along the axial direction of the auxiliary component 1311, thereby allowing the wire to be wound in the comb teeth on the winding plate 1313 to form a high-voltage coil 1320. That is, several sections of the high-voltage coil 1320 are distributed at intervals in the axial direction of the winding part 1312, with balanced force and good mechanical strength.

[0068] In this embodiment, the plurality of auxiliary components 1311 includes two first auxiliary components 13111 and at least one second auxiliary component 13112, combined with Figure 5 , Figure 7 and Figure 8 As shown, a first auxiliary component 13111 is secured to the end of the winding plate 1313, and a second auxiliary component 13112 is secured to the middle of the winding plate 1313. In other embodiments, the number of the first and second auxiliary components can be adjusted according to the design requirements of the high-voltage winding. For example, it may include two first auxiliary components, two or three or more second auxiliary components. The first auxiliary components are secured to the end of the winding plate, and multiple second auxiliary components are spaced apart along the axial direction of the winding body and secured to the middle of the winding plate. Alternatively, the first auxiliary component can be secured to the middle of the winding plate, and the second auxiliary component can be secured to the end of the winding plate, as long as the comb tooth structure of the winding plate is adjusted accordingly. No specific limitation is made here.

[0069] The inner surface of the first auxiliary component 13111 is provided with a plurality of first slots 1316, and a second slot 1317 is provided in the winding groove 1314 at the end of the winding plate 1313. The second slot 1317 is set close to the comb teeth at the end of the winding plate 1313, so that when the winding plate 1313 is installed in the first slot 1316 of the first auxiliary component 13111, the first auxiliary component 13111 can abut against the inner wall of the comb teeth at the end of the winding plate 1313, which can ensure a tighter connection between the first auxiliary component 13111 and the winding plate 1313, and does not affect the winding of the coil in the winding groove 1314 at the end of the winding plate 1313. The inner surface of the second auxiliary component 13112 is provided with a plurality of first slots 1316, and the top of the comb teeth in the middle of the winding plate 1313 is provided with a second slot 1317, so that when the winding plate 1313 is installed in the first slots 1316 of the second auxiliary component 13112, it does not affect the winding of the coil in the winding groove 1314 in the middle of the winding plate 1313.

[0070] The width of the first slot 1316 along the circumferential direction of the auxiliary component 1311 is defined as the slot width of the first slot 1316. The width of the second slot 1317 along the length of the winding plate 1313 is defined as the slot depth of the second slot 1317. The width of the winding plate 1313 along the circumferential direction of the winding body 1310 is defined as the thickness of the winding plate 1313. The slot width of the first slot 1316 matches the thickness of the winding plate 1313, and the slot depth of the second slot 1317 matches the thickness of the auxiliary component 1311 at the first slot 1316, so that the winding plate 1313... The assembly with the auxiliary component 1311 is secure, which avoids the problem that the width of the first slot 1316 is less than the thickness of the winding plate 1313 or the depth of the second slot 1317 is less than the thickness of the auxiliary component 1311 at the first slot 1316, making it difficult to fix the winding plate 1313 on the auxiliary component 1311. It also avoids the problem that the winding plate 1313 cannot be stably matched and will fall off the inside of the auxiliary component 1311 when the width of the first slot 1316 is greater than the thickness of the winding plate 1313 or the depth of the second slot 1317 is greater than the thickness of the auxiliary component 1311 at the first slot 1316.

[0071] Furthermore, the winding plate 1313 is fixed to the auxiliary component 1311 by an adhesive. Specifically, the second slot 1317 of the winding plate 1313 is fixedly connected to the first slot 1316 of the auxiliary component 1311 by the adhesive, which makes the connection between the winding plate 1313 and the auxiliary component 1311 more stable. The adhesive is a two-component high-temperature resistant epoxy resin, but other adhesives can also be used. However, it is necessary to ensure that the adhesive can firmly bond the winding plate 1313 and the auxiliary component 1311, and the adhesive must be heat resistant to adapt to the high-voltage insulation layer 1330 being coated with the winding plate 1313 and the auxiliary component 1311 by high-temperature injection.

[0072] Furthermore, each first auxiliary component 13111 has several first grooves 1318 on the side plate near the end of the comb teeth of the winding plate 1313. The several first grooves 1318 are connected to several first slots 1316 in a one-to-one correspondence and are also correspondingly provided with several winding plates 1313 to accommodate the comb teeth at the end of the winding plate 1313. A plurality of first grooves 1318 are arranged radially along the first auxiliary member 13111 and evenly distributed circumferentially along the first auxiliary member 13111. The length of the first groove 1318 along the radial direction of the first auxiliary member 13111 can be set according to the length of the comb teeth at the end of the winding plate 1313. The width of the first groove 1318 along the circumferential direction of the first auxiliary member 13111 matches the thickness of the winding plate 1313. The depth of the first groove 1318 along the axial direction of the first auxiliary member 13111 matches the tooth height of the comb teeth at the end of the winding plate 1313. Thus, when the second slot 1317 at the end of the winding plate 1313 is fixedly connected to the first slot 1316 of the first auxiliary member 13111, the comb teeth at the end of the winding plate 1313 can be accommodated in the first groove 1318, and the two end faces of the winding plate 1313 are respectively flush with the plate surfaces of the two first auxiliary members 13111 that are far apart from each other. Compared to the winding section structure where the winding plate protrudes from the auxiliary plate, the structure of this application can effectively avoid the injection impact force generated when the high-temperature vulcanized silicone rubber is injected into the winding body 1310, which could impact the comb teeth at the end of the winding plate 1313, thereby causing the winding plate 1313 to shift or even be damaged, affecting the quality of the high-voltage winding 130.

[0073] Furthermore, a limiting block 1417 is provided between two adjacent comb teeth at the end of the winding plate 1313, and the limiting block 1417 is arranged radially along the first auxiliary member 13111. Correspondingly, a plurality of second grooves are provided on the other side plate surface of the first auxiliary member 13111, and the plurality of second grooves are correspondingly arranged with a plurality of winding plates 1313 for engaging with the limiting block 1417. That is, the plurality of second grooves are arranged radially along the first auxiliary member 13111 and are evenly distributed along the circumference of the first auxiliary member 13111, and the plurality of second grooves are also connected to a plurality of first slots 1316 and a plurality of first grooves 1318 in a one-to-one correspondence. The length of the second groove along the radial direction of the first auxiliary member 13111 can be set according to the length of the limiting block 1417 along the radial direction of the winding body 1310, and can be designed according to the connection requirements of the two. The width of the second groove along the circumferential direction of the first auxiliary member 13111 matches the width of the limiting block 1417 along the circumferential direction of the winding body 1310. The depth of the second groove along the axial direction of the first auxiliary member 13111 matches the height of the limiting block 1417 along the axial direction of the winding body 1310. In addition, the distance between the comb teeth at the end of the winding plate 1313 and its adjacent limiting block 1417 is equal to the distance between the bottom of the first groove 1318 and the second groove on the first auxiliary member 13111. This allows the first auxiliary member 13111 to be securely locked on the limiting block 1417 through the second groove 1417, further improving the connection strength between the first auxiliary member 13111 and the winding plate 1313.

[0074] Furthermore, the inner side of the first auxiliary component 13111 is provided with several flow grooves 1319, which facilitates the injection of silicone rubber material from the end of the winding portion 1312 into the inner side of the winding portion 1312 during the injection molding process of the high-voltage insulating layer 1330. This allows the high-voltage insulating layer 1330 to fully fill the gap between the winding portion 1312 and the high-voltage coil 1320, as well as both ends of the winding portion 1312. In this embodiment, four flow grooves 1319 are provided, symmetrically arranged on the inner side of the first auxiliary component 1311, which makes the flow of the injected silicone rubber material more uniform and improves the injection quality. In other embodiments, one, two, three, or more flow grooves may be provided, or they may be asymmetrically arranged; no specific limitation is made here.

[0075] The width of the auxiliary component 1311 along the radial direction of the winding body 1310 is defined as the width of the auxiliary component 1311, and the width of the winding plate 1313 along the radial direction of the winding body 1310 is defined as the width of the winding plate 1313. Since the first auxiliary component 13111 plays a major role in fixing the two ends of the winding plate 1313, and the second auxiliary component 13112 plays a secondary role in fixing the middle part of the winding plate 1313, the width of the first auxiliary component 13111 is set to be greater than the width of the second auxiliary component 13112. This can reduce the amount of material used and lower the cost while ensuring the stable assembly of the winding part 1312. The width of the first auxiliary component 13111 is approximately equal to the width of the winding plate 1313. This ensures the stable assembly of the winding section 1312, preventing damage to the winding plate 1313 due to excessive injection pressure during the injection of the high-voltage insulation layer 1330. It also provides some restraint to the coil wound in the winding groove 1314 at the end of the winding plate 1313, preventing wire displacement and affecting the quality of the high-voltage winding 130. The width of the second auxiliary component 13112 can be smaller than the width of the winding plate 1313, for example, it can be half or one-third of the width of the winding plate 1313. This allows it to assist in fixing the winding plate 1313 without affecting the tap of the high-voltage coil 1320 at the center of the winding plate 1313.

[0076] Furthermore, the first auxiliary component 13111 has a plurality of first air passage holes 1511 in its middle portion. These first air passage holes 1511 are spaced apart circumferentially along the winding body 1310 to assist in fixing the air passage components. Specifically, the first air passage holes 1511 are through holes. A plurality of first air passage holes 1511 and a plurality of pads 1410 are correspondingly disposed on the same circumferential surface of the winding body 1310. The first air passage holes 1511 are located between two adjacent winding plates 1313 on which pads 1410 are installed. That is, the distance between the first air passage hole 1511 and the inner wall of the first auxiliary component 1311 is equal to the distance between the pad 1410 and the other side wall of the winding plate 1313 without comb teeth. The radial dimension of the first air passage hole 1511 along the winding body 1310 is equal to the width of the pad 1410. 11. The circumferential dimension of the winding body 1310 is less than or equal to the distance between the corresponding pads 1410 on two adjacent winding plates 1313. In this way, the air passage component can be inserted into the corresponding first air passage hole 1511 on the two first auxiliary components 13111, so that it can be stably installed in the installation space between the two adjacent winding plates 1313 with the pads 1410 without interference from the pads 1410. This avoids the air passage component from becoming loose and displaced due to the impact of large injection pressure during the injection of the high voltage insulation layer 1330, which would affect the quality of the air passage and the molding quality of the high voltage insulation layer 1330.

[0077] Furthermore, the second auxiliary component 13112 has a plurality of second air passage holes 1512 on its middle or outer side plate, and the plurality of second air passage holes 1512 correspond one-to-one with the plurality of first air passage holes 1511, for further assisting in fixing the air passage component. It can be understood that when the width of the second auxiliary component 13112 is greater than the distance between the first air passage hole 1511 and the inner side wall of the first auxiliary component 1311, the second air passage hole 1512 can be located in the middle of the second auxiliary component 13112; when the width of the second auxiliary component 13112 is slightly smaller than the distance between the first air passage hole 1511 and the inner side wall of the first auxiliary component 13112, the second air passage hole 1512 can be located on the outer side plate of the second auxiliary component 13112, that is, the second air passage hole 1512 is a slot-shaped hole. The positional distribution of the second air passage holes 1512 is similar to that of the first air passage holes 1511, and will not be described again here.

[0078] Furthermore, the outline shape of the first air passage hole 1511 and the second air passage hole 1512 matches the cross-sectional shape of the air passage component, so that the air passage component can be more securely installed in the corresponding first air passage hole 1511 and second air passage hole 1512, ensuring the quality of the air passage and the forming quality of the high voltage insulation layer 1330.

[0079] In this embodiment, a pad 1410 is provided in each winding groove 1314 on the fourteen winding plates 1313. Correspondingly, the middle part of the first auxiliary member 13111 is provided with thirteen first air passage holes 1511 at intervals, and the outer side of the second auxiliary member 13112 is provided with thirteen second air passage holes 1512. This makes each set of first air passage holes 1511 and second air passage holes 1512 spaced apart from the fourteen winding plates 1313. That is, in the fourteen winding plates 1313, no first air passage holes 1511 and second air passage holes 1512 are provided between two adjacent winding plates 1313, so as to leave space for the wire to be guided through the two adjacent winding grooves. After the winding plate 1313 is fixedly connected to the auxiliary component 1311, an installation space for an air duct component can be formed between any two adjacent winding plates 1313 on both sides of any set of first air duct holes 1511 and second air duct holes 1512. This allows for the formation of thirteen air ducts after the high-voltage winding 130 is formed, enabling the high-voltage winding 130 to achieve uniform and rapid heat dissipation, thereby improving the operational reliability of the product. In other embodiments, two, three, or more pads can be correspondingly provided in each winding slot on each winding plate, and two, three, or more turns of air duct holes can be correspondingly provided on each auxiliary component, thus forming more layers of air ducts. The specific arrangement can be adjusted according to the air duct design of the high-voltage winding, and no specific limitations are imposed here.

[0080] The winding body 1310 also includes several support members 1610, which are fixedly fixed to the inner circumference of the auxiliary member 1311 at intervals along the circumference of the winding body 1310, and the length direction of the support members 1610 is arranged along the axial direction of the winding body 1310. Specifically, the inner surface of each auxiliary member 1311 is also provided with several third slots 1611. The support member 1610 is a rectangular rod, and its length along the axial direction of the winding body 1310 is the same as that of the winding plate 1313. The support member 1610 is engaged with the inner circumference of the auxiliary member 1311 through the third slots 1611, so that when the wire is wound, the support member 1610 can abut against the winding fixture and firmly support the inner side of each section of the coil, avoiding the coil from sinking due to the winding tension, and ensuring the winding quality of the high voltage coil 1320. Furthermore, when the other side of the winding plate 1313 is provided with several support portions 1315, the side of the support member 1610 used to abut against the winding fixture can also be provided with several support portions 1315 to further ensure the support effect. The specific arrangement of the support portions 1315 is as described above and will not be repeated here. In other embodiments, the support member may be provided with several fourth slots, and each auxiliary member may be secured to the outer periphery of the support member through the fourth slots. Alternatively, the first auxiliary member may be provided with several third slots, and the support member may be provided with a fourth slot in the middle, so that each support member can be fixed to the inner periphery of the auxiliary member. No specific limitations are made here.

[0081] Furthermore, the support members 1610 are symmetrically distributed along the central axis of the winding body 1310. This ensures that the support provided by each support member 1610 to the coil is more uniform and stable, avoiding problems such as inconsistent thickness of the high-voltage insulation layer 1330 due to eccentric support, which would affect the quality of the high-voltage winding 130. The support members 1610 may include two, four, six, or more support members 1610. They may be distributed on both sides of the inner periphery of the auxiliary member 1311, or evenly distributed circumferentially on the inner periphery of the auxiliary member 1311, as long as uniform support for the conductor is achieved; no specific limitations are imposed here.

[0082] In this embodiment, the auxiliary component 1311 is also made of glass fiber impregnated with epoxy resin. After multiple layers of glass fiber cloth are impregnated with epoxy resin and stacked to a certain thickness, they are molded and cured to form a fiberglass component. The winding plate 1313 and the auxiliary component 1311 are separately formed and then fixed by snap-fit ​​bonding.

[0083] The winding body 1310 is made of the aforementioned fiber-reinforced composite material, which has the characteristics of being lightweight and high-strength. This gives the winding body 1310 good mechanical strength, effectively supporting the winding of the conductor and preventing damage. It also avoids the conductor being scattered and displaced by the injection impact force generated when high-temperature vulcanized silicone rubber is injected into the winding body 1310. Furthermore, the fiber-reinforced composite material has good heat resistance, preventing the winding body 1310 from deforming due to excessive heat generated by the high-voltage coil 1320 during the operation of the dry-type transformer 10.

[0084] Combination Figure 5 , Figure 6 , Figure 11 , Figure 13 and Figure 14 As shown, taking phase A transformer 100 as an example, the conductor is circumferentially wound on the outer circumferential surface of the winding body 1310 to form a high-voltage coil 1320. Specifically, the conductor is wound in the winding groove 1314 of the winding section 1312, so that the high-voltage coil 1320 is spaced apart along the axial direction of the winding body 1310. After the conductor is wound, two external connections are formed at the beginning and end, namely the first external connection D and the second external connection X. The first external connection D is used to connect cables, and the second external connection X is used to connect other external connections, such as the interconnection between the transformers of each phase in a three-phase transformer. Six taps are led out from the middle of the winding body 1310 along its axial direction, namely tap 2, tap 3, tap 4, tap 5, tap 6 and tap 7. The six taps form a tap changer. For ease of description, tap 2, tap 4 and tap 6 are defined as the first tap changer, and tap 3, tap 5 and tap 7 are defined as the second tap changer.

[0085] In one application scenario, the conductor uses a pancake winding method, with only one pancake coil in each winding slot 1314. Each coil segment contains only one pancake coil. The conductor includes a first conductor and a second conductor, both of which are continuous. Both the first and second conductors are covered with an insulating layer, which can be a polyimide film, a fiberglass film, or other insulating materials such as polyester varnish, or a combination of multiple insulating materials. For ease of description, when the high-voltage winding 130 is placed vertically, the upper end of the winding section 1312 is defined as the first end, and the lower end of the winding section 1312 is defined as the second end. The first conductor is wound from the first end of the winding section 1312 along the axial direction of the winding body 1310 to the middle of the winding section 1312, and three taps are led out. The first conductor is wound from the first end of the winding section 1312 to the second end of the winding section 1312. The first conductor is wound with the designed number of turns in the first winding groove 1314 corresponding to all winding plates 1313 to form the inner coil of the first section coil 1321. Then, a pad 1410 is installed in the winding groove 1314. That is, each pad 1410 is respectively clamped on the limiting step 1412 of the corresponding second comb tooth on all winding plates 1313 through the mounting groove 1413. The first conductor is introduced into the cross-line groove 1414 from the inlet 1415 on one of the pads 1410 with the cross-line groove 1414 and led out from the outlet 1416. The designed number of turns is then wound in the winding groove 1314 to form the outer coil of the first section coil 1321. The inner turn of the first coil 1321 (i.e., the beginning of the first wire) is the first external connector D. The outer turn of the first coil 1321 extends into the corresponding second winding slot 1314 on all winding plates 1313 to continue winding and form the inner coil of the second coil 1322. Then, the spacer 1410 is installed and the outer coil of the second coil 1322 is wound, and so on, until the first wire is wound to the middle of the winding body 1310 to form several coil segments. Three taps are led out from the outer turn of three of the coil segments, respectively. Figure 13 The taps 6, 4, and 2 shown represent the completion of the first wire winding.

[0086] The second conductor is wound from the middle of the winding section 1312 along the axial direction of the winding body 1310 to the second end of the winding section 1312, and three additional taps are led out. Specifically, the second conductor begins to wind in the next winding groove 1314 adjacent to tap 2, forming the third coil segment 1323. The second conductor continues to wind towards the second end of the winding section 1312 in the same winding manner as the first conductor, forming several coil segments. During the winding process, three additional taps are led out from the three coil segments starting from the third coil segment 1323, namely tap 3, tap 5, and tap 7, until the second conductor winds to the last winding groove 1314 of the corresponding turn on each winding plate 1313 at the second end of the winding section 1312 and forms the terminal coil segment 1324. The outer turn of the terminal coil segment 1324 (i.e., the end of the second conductor) is the second external connector X, and the winding of the second conductor is now complete.

[0087] When the wire is wound, it is wound in a winding groove 1314 corresponding to all the winding plates 1313, so that each coil formed by the wire is perpendicular to the axis of the winding body 1310. The winding is convenient and the wire is neatly arranged. The winding plate 1313 is subjected to uniform force and has good mechanical strength.

[0088] Thus, a disc-shaped high-voltage coil 1320 is formed, which has good mechanical strength and strong resistance to the electrodynamic forces generated by short-circuit currents. Compared with a layered coil, it has more discs and better heat dissipation. Furthermore, in the axial direction of the winding body 1310, the first tap changer and the second tap changer are arranged parallel to each other, and the six taps form the tapping device of the high-voltage coil 1320, used by the dry-type transformer 10 to adjust the voltage according to different operating conditions. Of course, a layered coil can also be used in other embodiments.

[0089] The conductor is wound around the winding body 1310 to form a high-voltage coil 1320, which is thus loop-shaped. The loop width of the high-voltage coil 1320 is defined as its width. The width of the high-voltage coil 1320 is consistent in all its radial sections, ensuring overall force balance. Of course, considering practical operation, the widths of each coil in its radial section may not be exactly the same, as long as they are approximately the same.

[0090] In this embodiment, the tap changer includes six taps, so the dry-type transformer 10 has five adjustable voltage levels. In other embodiments, the tap changer may also include four taps, that is, the first tap changer and the second tap changer each include two taps, so the dry-type transformer has three adjustable voltage levels. As long as it meets the actual usage requirements of the dry-type transformer, it is acceptable and no limitation is imposed here.

[0091] like Figure 11 and Figure 12As shown, the high-voltage insulation layer 1330 wraps around the high-voltage coil 1320 and the winding body 1310 to form the high-voltage winding 130. The high-voltage insulation layer 1330 is made of high-temperature vulcanized silicone rubber. First, the conductor is wound around the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 and the high-voltage coil 1320 are used as the injection mold. The injection mold is filled with high-temperature vulcanized silicone rubber by adding silicone rubber raw material, and the high-voltage winding 130 is obtained by injecting it into the outer periphery of the injection mold. The high-voltage insulation layer 1330 uses high-temperature vulcanized silicone rubber, which improves the overall insulation and mechanical properties of the high-voltage winding 130.

[0092] The high-temperature vulcanized silicone rubber of this application adopts a high-temperature vulcanized silicone rubber material system, which specifically includes raw rubber, reinforcing agent, flame retardant, heat resistant agent and other auxiliary materials.

[0093] Before injecting the high-temperature vulcanized silicone rubber, air duct components need to be installed. Several air duct components are installed on each auxiliary component 1311 through corresponding air duct holes. Additionally, tooling connectors can be installed on the injection mold. These tooling connectors have protective cavities corresponding to the six taps. The taps are fixed within these protective cavities, and the remaining space within the cavities is filled using bolts or other connectors. This prevents the six taps from being encased in silicone rubber during the injection process and thus unusable for wiring.

[0094] After the high-voltage coil 1320 and the winding body 1310 are encapsulated by high-temperature vulcanized silicone rubber through vacuum injection, the high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the winding body 1310 and wraps the two ends of the winding body 1310, so that the high-voltage winding 130 is hollow columnar in whole, and the air passage component is pulled out, forming several axial air passages in the high-voltage insulation layer 1330.

[0095] The high-voltage winding 130 of this application has a high-temperature vulcanized silicone rubber high-voltage insulation layer 1330 prepared outside the high-voltage coil 1320. Compared with the epoxy resin high-voltage insulation layer in the prior art, it has the following advantages: 1) It has better fire resistance, low-temperature resistance, aging resistance and short-circuit test capability, which can effectively extend the service life of the dry-type transformer 10; 2) The copper coil is easy to peel off from the silicone rubber, and the material recyclability is greater than 99%, which is more environmentally friendly; 3) The silicone rubber elastomer can reduce the partial discharge caused by mechanical vibration, which has an inhibitory effect on equipment discharge, and the product of silicone rubber under discharge is non-conductive silicon dioxide, which can effectively inhibit the continued deterioration of insulation; 4) It can reduce the operating loss of the transformer and save energy; 5) It has better resistance to harsh environments and can be installed indoors and outdoors. Meanwhile, this application utilizes integral high-temperature vulcanization injection molding. Compared to existing room-temperature vulcanization, this process makes the high-voltage insulation layer 1330 more stable, has higher mechanical properties, and exhibits better adhesion to the high-voltage coil 1320 and winding body 1310, effectively extending the service life of the high-voltage insulation layer 1330. Furthermore, compared to liquid silicone rubber, the high-temperature vulcanized silicone rubber filler in this application is more uniformly dispersed, preventing partial discharge in the dry-type transformer 10 due to filler agglomeration, thus resulting in superior overall performance of the dry-type transformer 10.

[0096] In this embodiment, such as Figure 14 The diagram shows a partial cross-sectional view of the high-voltage winding 130, which is covered with a high-voltage insulation layer 1330, cut along its axial direction. The conductor is wound using the aforementioned winding method in a comb-shaped winding plate 1313 to form a disc-shaped high-voltage coil 1320. Along the axial direction of the high-voltage winding 130, the disc-shaped high-voltage coil 1320 and the comb teeth of the winding plate 1313 are spaced apart, meaning a disc coil is positioned between two adjacent comb teeth. In other embodiments, the conductor can also be wound using other methods to form the high-voltage coil, as long as the structure of the winding portion is adjusted accordingly; no specific limitations are imposed here.

[0097] The technical content and features of this application have been disclosed above. However, it is understood that, based on the inventive concept of this application, those skilled in the art can make various changes and improvements to the above-described structure and materials, including combinations of the technical features disclosed or claimed herein, and explicitly including other combinations of these features. All such modifications and / or combinations fall within the technical field to which this application pertains and are within the scope of protection of the claims of this application.

Claims

1. A winding body of a high-voltage winding for winding a conductor to form a high-voltage coil, characterized in that the winding body comprises: a plurality of winding plates distributed along the circumferential direction of the winding body, the length direction of the plurality of winding plates being arranged along the axial direction of the winding body, and a plurality of winding grooves are arranged on the winding plates to form a plurality of comb teeth, the lengths of the comb teeth at the end of the winding plate and the comb teeth at the middle of the winding plate are smaller than the lengths of the comb teeth at other parts along the radial length of the winding body; a spacer is arranged in each winding groove on at least two adjacent winding plates, the length direction of the spacer is arranged along the circumferential direction of the winding body, and the spacer is located at the middle of the comb teeth; a plurality of auxiliary members are arranged along the axial direction of the winding body, the plurality of auxiliary members are annular and spaced apart, and the plurality of winding plates are fixedly connected with the auxiliary members. The winding plate is clamped on the inner periphery of the auxiliary member, the plurality of auxiliary members comprise two first auxiliary members and at least one second auxiliary member, the first auxiliary member is clamped on the end of the winding plate, and the second auxiliary member is clamped on the middle of the winding plate. A plurality of first grooves are arranged on one side of the first auxiliary member, the plurality of first grooves correspond to the plurality of winding plates, and are used to accommodate the comb teeth at the end of the winding plate. A limiting block is arranged between the two adjacent comb teeth at the end of the winding plate, a plurality of second grooves are arranged on the other side of the first auxiliary member, the plurality of second grooves correspond to the plurality of winding plates, and are used to be clamped and connected with the limiting block.

2. The winding body of a high voltage winding as claimed in claim 1, characterized in that The length of the second groove along the radial direction of the first auxiliary member corresponds to the length of the limiting block along the radial direction of the winding body; the width of the second groove along the circumferential direction of the first auxiliary member matches the width of the limiting block along the circumferential direction of the winding body; the depth of the second groove along the axial direction of the first auxiliary member matches the height of the limiting block along the axial direction of the winding body; the distance between the comb teeth at the end of the winding plate and the adjacent limiting block is equal to the distance between the groove bottoms of the first grooves and the second grooves on the first auxiliary member.

3. The winding body of a high voltage winding as claimed in claim 2, characterized in that The spacer is clamped and connected at the middle of the comb teeth.

4. The winding body of a high voltage winding as claimed in claim 3, characterized in that L-shaped grooves are arranged on both sides of the comb teeth, the two L-shaped grooves are arranged opposite to each other and symmetrically distributed along the length direction of the winding plate, so that two limiting steps are formed on both sides of the middle of the comb teeth.

5. The winding body of a high voltage winding as claimed in claim 4, characterized in that An installation groove is arranged on one side of the middle of the spacer, the installation groove is arranged along the radial direction of the winding body, and the spacer is clamped on the limiting step of the comb teeth through the installation groove.

6. The winding body of a high voltage winding as claimed in claim 1, characterized in that The height of the installation groove on the spacer is slightly smaller than or equal to the width of the winding groove along the axial direction of the winding body.

7. The winding body of a high voltage winding as claimed in claim 6, characterized in that The other side of the winding plate without the comb teeth is provided with a plurality of support portions, the plurality of support portions are arranged along the radial direction of the winding body and spaced apart along the axial direction of the winding body.

8. The winding body of a high voltage winding according to claim 7, characterized in that ​ 9. The winding body of a high voltage winding according to claim 8, characterized in that ​ 10. The winding body of a high voltage winding as claimed in claim 1, characterized in that ​

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