Cushion block

Abstract

The utility model discloses a cushion block which is used for preparing a high-voltage winding provided with an air channel, a winding body of the high-voltage winding comprises a plurality of winding plates, a plurality of winding grooves are formed in the winding plates, so that a plurality of comb teeth are formed on one sides of the winding plates and used for winding wires, the cushion block is an arc-shaped block, and the radian of the cushion block is matched with the circumferential surface of the winding body. The length direction of the cushion block is arranged in the circumferential direction of the winding body, and in the length direction of the comb teeth, the cushion block is located in the middle of the comb teeth and used for separating wires wound on the comb teeth so as to form an installation space of the air channel piece. According to the high-voltage winding, the installation space of the air channel piece can be formed in the wire winding process through the cushion block, so that an air channel is formed in the high-voltage winding, the heat dissipation performance of the high-voltage winding is improved, the manufacturing cost and the installation cost are saved, and the competitive advantage of a product is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transformers, in particular to a cushion block. BACKGROUND

[0002] At present, transformers can be divided into oil-immersed transformers, dry-type transformers and gas transformers. Dry-type transformers have the advantages of no oil, fire prevention, long service life, energy saving, low noise, simple maintenance, safety and reliability. Most of the dry-type transformers on the current market are dry-type transformers with resin-encapsulated high-voltage windings and open dry-type transformers. Although dry-type transformers have developed greatly in the past 10 years, there are still problems such as insulation cracking, poor heat conduction and harsh operating environment.

[0003] The current pie-type high-voltage winding of the dry-type transformer usually uses a rigid comb plate as a winding structure, and a winding slot is formed between any two adjacent combs. When winding, the winding generally starts from one end of the rigid comb plate, and a number of turns of coils are wound in the first winding slot on the rigid comb plate according to the pie-type winding method to form a first pie coil. The second pie coil is wound in the winding slot or the next winding slot, and all the coils are wound completely. Since the pie-type coil usually needs to be wound after the completion of the first pie coil, it is difficult to set up a cooling air duct inside the pie-type coil to cool the high-voltage winding. A common solution to this problem is to use larger gauge wires to avoid the influence of coil heating on the performance of the high-voltage winding. However, this method will increase the use of iron cores and wires, increase the size of the product, and thus increase the production cost and installation cost, making the product lose its competitive advantage. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a cushion block which can form an installation space for an air duct piece during the winding process of the wire, so as to form an air duct in the high-voltage winding, improve the heat dissipation performance of the high-voltage winding, save the manufacturing cost and installation cost, and improve the competitive advantage of the product.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: a cushion block for preparing a high-voltage winding with an air duct, the winding body of the high-voltage winding comprising a plurality of winding plates, the winding plates being provided with a plurality of winding slots to form a plurality of combs on one side of the winding plate for winding wires, the cushion block being an arc block, the curvature of the cushion block matching the peripheral surface of the winding body, the length direction of the cushion block being arranged along the peripheral direction of the winding body, and in the length direction of the comb, the cushion block is located in the middle part of the comb to separate the wires wound on the comb and form an installation space for an air duct piece.

[0006] Among them, the cushion block is clamped and connected in the middle part of the comb.

[0007] Two sides of the comb tooth are provided with L-shaped grooves, the two L-shaped grooves are oppositely arranged and symmetrically distributed along the length direction of the winding plate, so that two limiting steps are formed on both sides of the middle part of the comb tooth for mounting the cushion block.

[0008] The middle part of one side of the cushion block is provided with a mounting groove, the mounting groove is arranged along the radial direction of the winding body, and the cushion block is clamped on the limiting step of the comb tooth through the mounting groove.

[0009] The height of the mounting groove on the cushion block is slightly smaller than or equal to the width of the winding groove along the axial direction of the winding body.

[0010] The bottom wall of the mounting groove is provided with a rounded corner structure at both ends, and / or the two sides of the cushion block along the length direction of the cushion block are provided with an inverted bevel structure.

[0011] The other side of the cushion block without the mounting groove is provided with a wire crossing groove, the wire crossing groove is arranged obliquely, so that a wire inlet is formed on the bottom side of one end of the cushion block, and a wire outlet is formed on the top side of the other end of the cushion block.

[0012] The size of the wire inlet and the wire outlet is greater than the cross-sectional dimension of the wire.

[0013] The wire inlet is located on the inner side surface of one end of the cushion block close to the bottom of the comb tooth, and the wire outlet is located on the outer side surface of the other end of the cushion block away from the bottom of the comb tooth; or the wire inlet is located on the bottom side of the end surface of one end of the cushion block, and the wire outlet is located on the top side of the end surface of the other end of the cushion block; or the wire inlet is located on the inner side surface of one end of the cushion block close to the bottom of the comb tooth, and the wire outlet is located on the top side of the end surface of the other end of the cushion block; or the wire inlet is located on the bottom side of the end surface of one end of the cushion block, and the wire outlet is located on the outer side surface of the other end of the cushion block away from the bottom of the comb tooth.

[0014] The depth of the wire crossing groove matches the width of the wire, and the width of the wire crossing groove matches the thickness of the wire.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, the cushion block can form an installation space of the air passage part during the winding process of the wire, so as to form an air passage, improve the heat dissipation performance of the high-voltage winding, save the manufacturing cost and the installation cost, and improve the competitive advantage of the product; the cushion block can also support the wire in the winding groove to further ensure the firmness of the wire winding. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the front view of the dry-type transformer 10 of an embodiment of the present application;

[0017] Figure 2 is the top view of the dry-type transformer 10 of an embodiment of the present application;

[0018] Figure 3is a front view of the assembled core 110 of one embodiment of the present application;

[0019] Figure 4 is Figure 2 is an enlarged view of the portion G in FIG. 10;

[0020] Figure 5 is a perspective view of the winding body 1310 of one embodiment of the present application;

[0021] Figure 6 is a perspective view of the winding plate 1313 of one embodiment of the present application;

[0022] Figure 7 is a perspective view of the first auxiliary member 13111 of one embodiment of the present application;

[0023] Figure 8 is a perspective view of the second auxiliary member 13112 of one embodiment of the present application;

[0024] Figure 9 is a perspective view of the spacer 1410 of one embodiment of the present application;

[0025] Figure 10 is a perspective view of the spacer 1410 of another embodiment of the present application;

[0026] Figure 11 is a perspective view of the high-voltage coil 1320 wound on the winding body 1310 of one embodiment of the present application;

[0027] Figure 12 is a perspective view of the high-voltage winding 130 of one embodiment of the present application;

[0028] Figure 13 is a circuit diagram of the high-voltage coil 1320 of one embodiment of the present application;

[0029] Figure 14 is a partial cross-sectional view of the high-voltage winding 130 of one embodiment of the present application. DETAILED DESCRIPTION

[0030] In accordance with the requirements of the application will now be disclosed. However, it should be understood that the embodiments disclosed herein are merely typical examples of the application, which can be embodied in various forms. Therefore, the specific details disclosed herein are not considered limiting, but only as a representative basis for the claims and as a representative basis for teaching those skilled in the art to apply the application in any appropriate manner in practice, including the use of various features disclosed herein and in combination with features that can not be explicitly disclosed herein.

[0031] "connected" in the present application, unless otherwise explicitly specified or limited, shall be construed in a broad sense, which can be directly connected or connected through an intermediate medium. In the description of the present application, it should be understood that the orientation or positional relationship indicated by "upper", "lower", "end", "one end" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] As shown in Figures 1-3 , the dry-type transformer 10 is a three-phase transformer, which is A-phase, B-phase and C-phase respectively, that is, the dry-type transformer 10 includes three single-phase transformers 100. According to the structure of the core 110, the three transformers 100 can be arranged to form a linear type or a triangular structure, and the three transformers 100 are in a symmetrical structure. In addition, the dry-type transformer 10 can also be an isolation transformer, a frequency conversion transformer, a test transformer, etc.

[0033] In an embodiment, continuing to refer to Figures 1-3 , the three transformers 100 are arranged to form a linear structure, and the dry-type transformer 10 includes the core 110, three low-voltage windings 120 and three high-voltage windings 130. The core 110, the low-voltage winding 120 and the high-voltage winding 130 are arranged in order from inside to outside. The core 110 includes three columnar core bodies 111, an upper yoke 112 located at the upper end of the three columnar core bodies 111 and a lower yoke 113 located at the lower end of the three columnar core bodies 111, the three low-voltage windings 120 are respectively sleeved on the outer periphery of the three columnar core bodies 111, and the three high-voltage windings 130 are respectively sleeved on the outer periphery of the three low-voltage windings 120, that is, the three columnar core bodies 111, the three low-voltage windings 120 and the three high-voltage windings 130 are sleeved one by one in order from inside to outside. The columnar core body 111 is made of a plurality of layers of silicon steel sheets stacked together and is fixed by binding with a binding tape outside the plurality of layers of silicon steel sheets. The radial cross section of the columnar core body 111 is substantially elliptical or circular or other shapes, as long as it can be accommodated in the hollow cavity of the low-voltage winding 120, which is not limited here. The upper yoke 112 and the lower yoke 113 are also made of a plurality of layers of silicon steel sheets stacked together, so that the three columnar core bodies 111 are fixedly connected, thereby forming a three-phase core 110 as shown in Figure 3 .

[0034] In combination with Figure 1 and Figure 2As shown, the outer side of the iron core 110 is provided with an iron core clamp 140, which is formed by three clamps connected to each other to form a structure similar to a channel steel, i.e., the iron core clamp 140 as a whole has a "Fang" shaped structure. Of course, in other embodiments, the iron core clamp can also be a hollow pipe, i.e., the iron core clamp is formed by a plurality of clamps connected to each other and surrounded by a plate structure to form a closed structure, so that the structure of the iron core clamp is more stable.

[0035] The iron core clamp 140 is made of a fiber-reinforced composite material, which can be molded by impregnating glass fibers with epoxy resin, or molded by impregnating aramid fibers with epoxy resin, or can be integrally formed by other composite materials, which is not limited here.

[0036] The fiber-reinforced composite material refers to a composite material formed by winding, molding or pultrusion of reinforcing fiber materials such as glass fibers and aramid fibers, and a matrix material. The iron core clamp 140 made of fiber-reinforced composite material has low cost, light weight, good mechanical properties, and low carbon emission in the production process, which is more green and environmentally friendly.

[0037] In combination Figure 2 and Figure 4 As shown, the low-voltage winding 120 includes a copper foil 121, a low-voltage insulation layer 122, and a support strip 123, and the copper foil 121 and the low-voltage insulation layer 122 are arranged alternately. Specifically, the copper foil 121 is formed by winding an entire copper foil, and the low-voltage insulation layer 122 is arranged in overlap with the copper foil 121 and is wound together. The low-voltage winding 120 is provided with at least one heat dissipation air channel, which is located between adjacent copper foils 121 and low-voltage insulation layers 122, and the support strip 123 is located in the heat dissipation air channel and is used to support the adjacent copper foils 121 and low-voltage insulation layers 122. The support strip 123 is an insulating support strip 123, and a plurality of insulating support strips 123 are arranged in each heat dissipation air channel, and the plurality of insulating support strips 123 are arranged in a circumferential direction of the outer circumferential surface of the copper foil 121 and are spaced apart, which simultaneously serves to support the adjacent copper foils 121 and low-voltage insulation layers 122. The insulating support strips 123 arranged in each heat dissipation air channel are at least two, which can be two, three, four or more. Preferably, the plurality of insulating support strips 123 in the same layer are uniformly and spaced apart in the circumferential direction of the outer circumferential surface of the copper foil 121. The arrangement of the heat dissipation air channel can release the heat generated by the low-voltage winding 120 during the operation of the dry-type transformer 10, thereby avoiding overheating failure. The heat dissipation air channel can be provided with one layer, two layers or more layers, which is not limited here.

[0038] The low-voltage insulation layer 122 is made of polyimide impregnated paper, specifically SHS-P diphenyl ether pre-impregnated material, which is made by impregnating diphenyl ether resin with polyimide film and poly sulfone fiber non-woven soft composite material and then baking. Of course, the low-voltage insulation layer can also be made of DMD insulation paper or silicone rubber film, or other insulating materials, which can be selected according to the different insulation heat resistance grades of dry-type transformers.

[0039] The insulation support strip 123 is made of glass fiber impregnated epoxy resin or aramid fiber impregnated epoxy resin, which is not limited here. The insulation support strip 123 is a long strip with an I-shaped cross section, which has more stable mechanical strength. Of course, the insulation support strip can also be a long strip with a square cross section or other shapes, as long as it can play a supporting and isolating role.

[0040] As shown in Figures 5-14 The high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320, and a high-voltage insulation layer 1330. The conductive wire is wound on the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 includes a winding portion 1312, and the conductive wire is wound in the winding portion 1312 to form the high-voltage coil 1320. The high-voltage coil 1320 includes a plurality of coil segments, and the plurality of coil segments are distributed along the axial direction of the winding body 1310.

[0041] The winding portion 1312 includes a plurality of winding plates 1313. The length direction of the plurality of winding plates 1313 is arranged along the axial direction of the winding body 1310 and uniformly distributed along the circumferential direction of the winding body 1310. A plurality of winding grooves 1314 are arranged on the winding plate 1313 to form a plurality of comb teeth on one side of the winding plate 1313, which are used for winding the conductive wire. The number of winding plates 1313 is at least two, which can be two, three or more, which is not limited here. In order to make the conductive wire wind firmly and save materials as much as possible, the number of winding plates 1313 of the 10kV / 1000kVA dry-type transformer is set to twelve.

[0042] The winding plate 1313 is a rectangular plate, and the longer side of the winding plate 1313 is arranged along the axial direction of the winding body 1310. A plurality of winding grooves 1314 on the winding plate 1313 are arranged along the radial direction of the winding body 1310 and are spaced apart along the axial direction of the winding body 1310, so that one side of the winding plate 1313 forms a plurality of comb teeth. 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 middle of the winding plate 1313 needs to lead out the taps of the tap line. If the tooth height of the comb teeth in the middle of the winding plate 1313 is set to be larger, the distance between the corresponding adjacent two winding grooves 1314 is larger, and space can be left for the taps led out from the middle of the winding plate 1313. Further, the length of the comb teeth in the middle of the winding plate 1313 along the radial direction of the winding body 1310 is less than the length of the comb teeth in other parts. If the length of the comb teeth in the middle of the winding plate 1313 is set to be smaller, the strength of the winding plate 1313 can be ensured while saving materials and reducing costs. If the length of the comb teeth in the middle of the winding plate 1313 is set to be smaller, space can be left for the taps led out from the middle of the winding plate 1313.

[0043] At least one coil is arranged between the adjacent two comb teeth on the winding plate 1313, so that each winding groove 1314 is wound with a wire. The high-voltage coil 1320 is reasonably distributed and arranged, and each coil is arranged at intervals. Specifically, when the plurality of winding plates 1313 are circumferentially uniformly distributed, the winding grooves 1314 on all the winding plates 1313 correspond to each other in the circumferential direction of the winding body 1310. Each coil is wound with a wire on a corresponding circle of winding grooves 1314 on all the winding plates 1313 along the circumferential direction of the winding body 1310. The stress is balanced, and the mechanical strength is good.

[0044] In other embodiments, in order to leave space for the arrangement position of the taps, the plurality of winding plates can also be unevenly arranged. For example, the distance between any two adjacent winding plates is greater than the distance between any other two adjacent winding plates. At this time, each tap is led out from the two adjacent winding plates. In this way, 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 arrangement position of each tap can also be left.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] In the embodiment, the cushion block 1410 is clamped and connected at the middle of the comb tooth, so that the cushion block 1410 can be stably arranged in the winding groove 1314. Specifically, the two sides of the comb tooth on the winding plate 1313 where the cushion block 1410 is installed are provided with L-shaped grooves 1411, the two L-shaped grooves 1411 are oppositely arranged and symmetrically distributed along the length direction of the winding plate 1313, so that the cross section of the comb tooth along the radial direction of the winding body 1310 is in the shape of "convex", thereby forming two limiting steps 1412 at the two sides of the middle of the comb tooth, for installing the cushion block 1410. Correspondingly, the middle of one side of the cushion block 1410 is provided with an installation groove 1413, the installation groove 1413 is arranged along the radial direction of the winding body 1310, and the cushion block 1410 is clamped on the limiting step 1412 of the comb tooth through the installation groove 1413, so that the cushion block 1410 can be stably clamped on the middle of the comb tooth.

[0049] The height of the cushion block 1410 along the axial direction of the winding body 1310 is defined as the height of the cushion block 1410, the width of the cushion block 1410 along the radial direction of the winding body 1310 is defined as the width of the cushion block 1410, and the length of the cushion block 1410 along the circumferential direction of the winding body 1310 is defined as the length of the cushion block 1410. The height of the installation groove 1413 on the cushion block 1410 can be slightly smaller than or equal to the width of the winding groove 1314 along the axial direction of the winding body 1310, so that the cushion block 1410 can be clamped on the comb tooth and accommodated in the winding groove 1314, thereby ensuring the supporting effect on the wire in the winding groove 1314; the width of the cushion block 1410 is directly related to the width of the formed air passage piece installation space along the radial direction of the winding body 1310, and can be adjusted according to the design requirements of the air passage of the high-voltage winding 130; the length of the cushion block 1410 can be adjusted according to the supporting requirements of the wire and the installation requirements of the air passage piece, as long as the cushion blocks 1410 installed on the adjacent two winding plates 1313 do not interfere with each other, which is not limited specifically herein.

[0050] Further, the bottom wall of the installation groove 1413 on the cushion block 1410 can be provided with a rounded corner structure, so as to facilitate the assembly of the cushion block 1410 and the winding plate 1313. The two ends of the cushion block 1410 along the length direction thereof can also be provided with a rounded corner structure, so as to avoid the sharp edges of the two ends of the cushion block 1410 damaging the insulation layer of the wire surface and affecting the insulation performance of the high-voltage winding 130; and the two sides of the cushion block 1410 along the length direction thereof can also be provided with an inclined corner structure, so as to facilitate the flow of silicone rubber in the subsequent injection molding process, ensure the uniformity and stability of the high-voltage insulation layer 1330, and thereby ensure the quality of the high-voltage winding 130.

[0051] Further, as shown in FIG. 13B, the cushion block 1410 can be provided with a plurality of installation grooves 1413 along the length direction thereof, and the installation grooves 1413 are arranged along the radial direction of the winding body 1310. The installation grooves 1413 on the cushion block 1410 can be arranged in pairs along the length direction of the cushion block 1410, and the two installation grooves 1413 in each pair are oppositely arranged and symmetrically distributed along the length direction of the cushion block 1410, so as to form two limiting steps 1412 at the two sides of the middle of the comb tooth, for installing the cushion block 1410. Figure 10As shown, the other side of the cushion block 1410 which is not provided with the mounting groove 1413 can be provided with a cross-wire groove 1414 which is obliquely arranged, so that the bottom side of one end of the cushion block 1410 forms a wire inlet 1415, and the top side of the other end of the cushion block 1410 forms a wire outlet 1416, so as to facilitate the transition winding of the wire from the inner side of the cushion block 1410 to the outer side of the cushion block 1410.

[0052] The size of the wire inlet 1415 and the wire outlet 1416 can be greater than the cross-sectional dimension of the wire, so that the wire can be easily inserted from the wire inlet 1415 and then passed out of the wire outlet 1416 after passing through the cross-wire groove 1414, which is simple and efficient. In addition, the positions of the wire inlet 1415 and the wire outlet 1416 can be specifically arranged as follows: the wire inlet 1415 is located on the inner side of the one end of the cushion block 1410 close to the bottom of the comb tooth, and the wire outlet 1416 is located on the outer side of the other end of the cushion block 1410 away from the bottom of the comb tooth, so that the cross-wire groove 1414 extends obliquely from the inner side of the cushion block 1410 to the outer side of the cushion block 1410; or the wire inlet 1415 is located on the bottom side of the end face of the one end of the cushion block 1410, and the wire outlet 1416 is located on the top side of the end face of the other end of the cushion block 1410, so that the cross-wire groove 1414 extends obliquely from the one end face of the cushion block 1410 to the other end face of the cushion block 1410; or the wire inlet 1415 is located on the inner side of the one end of the cushion block 1410 close to the bottom of the comb tooth, and the wire outlet 1416 is located on the top side of the end face of the other end of the cushion block 1410, so that the cross-wire groove 1414 extends from the inner side of the cushion block 1410 to the other end face of the cushion block 1410; or the wire inlet 1415 is located on the bottom side of the end face of the one end of the cushion block 1410, and the wire outlet 1416 is located on the outer side of the other end of the cushion block 1410 away from the bottom of the comb tooth, as long as the transition winding of the wire can be realized, which is not specifically limited here.

[0053] The depth of the cross-wire groove 1414 along the axial direction of the wire winding body 1310 is defined as the depth of the cross-wire groove 1414, and the width of the cross-wire groove 1414 along the radial direction of the wire winding body 1310 is defined as the width of the cross-wire groove 1414; the width of the wire along the axial direction of the wire winding body 1310 is defined as the width of the wire, and the thickness of the wire along the radial direction of the wire winding body 1310 is defined as the thickness of the wire. The depth of the cross-wire groove 1414 matches the width of the wire, and the width of the cross-wire groove 1414 matches the thickness of the wire. In an application scenario, a pie-shaped coil is arranged in each wire winding groove 1314, the depth of the cross-wire groove 1414 can be slightly greater than or equal to the width of the wire, and the width of the cross-wire groove 1414 can be slightly greater than or equal to the thickness of the wire, so as to facilitate the passing of the wire in the wire winding groove 1414 and improve the efficiency of the cross-wire operation.

[0054] Further, the two side ends of the cushion block 1410 can be provided with notches 1418, so that after a certain number of turns are wound in a winding groove 1314, the wire can be guided to pass into the next winding groove adjacent to it from the notch 1418 to continue winding without being interfered by the cushion block 1410 in the winding groove 1314. The shape and size of the notch 1418 can be designed according to the winding requirements, which is not specifically limited here.

[0055] Further, the other side of the winding plate 1313 not provided with the comb teeth is provided with a plurality of support portions 1315 for abutting the winding tool, i.e. the support portions 1315 and the comb teeth are respectively located on the opposite sides of the winding plate 1313, and the plurality of support portions 1315 are arranged along the radial direction of the winding body 1310 and are spaced apart along the axial direction of the winding body 1310. The plurality of support portions 1315 abut the outer circumferential surface of the winding tool, so that under the high temperature condition of injection molding of the high-voltage insulating layer 1330, the winding plate 1313 will not soften and deform due to high temperature, causing the high-voltage coil 1320 to lack support, effectively avoiding the high-voltage coil 1320 from deforming inwardly, and ensuring the quality of the high-voltage winding 130. In addition, the arrangement of the support portions 1315 makes the distance between the bottom surface of the winding groove 1314 of the winding plate 1313 and the side of the winding plate 1313 not provided with the comb teeth not need to be set too large to meet the strength design requirements, so that the space required by the winding portion 1312 can be reduced, and the amount of wire required by the high-voltage coil 1320 and the amount of silicone rubber required by the high-voltage insulating layer 1330 can be reduced, effectively reducing the cost, and the size of the high-voltage winding 130 of the same voltage level can also be smaller, saving the floor area.

[0056] 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 width of the support portion 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 width of the support portion 1315 in other parts of the winding plate 1313. This is because the two ends of the winding plate 1313 need to be slotted to be fixed with the auxiliary member 1311. The width of the support portion 1315 at the end of the winding plate 1313 is set to be larger, which can ensure that the slotting of the end of the winding plate 1313 does not weaken its mechanical strength, and the support portion 1315 can provide sufficient support to the end of the high-voltage coil 1320. For example, the support portion 1315 can be arranged to correspond to the position of the winding slot 1314 at the end of the winding plate 1313, and one end of the support portion 1315 can extend to the same level as the end surface of the winding plate 1313. Since the comb teeth in the middle of the winding plate 1313 have a large tooth height, the distance between the two adjacent winding slots 1314 is also large. The width of the support portion 1315 in the middle of the winding plate 1313 is set to be larger, which can ensure that the support portion 1315 can provide sufficient support to the middle of the high-voltage coil 1320. For example, the support portion 1315 can be arranged to correspond to the position of the 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.

[0057] At the same time, the area where the support portion 1315 with a larger width is located is defined as a wide support area, and the area where the support portion 1315 with a smaller width is located is defined as a narrow support area. Then, through the above setting, the winding plate 1313 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 from one end to the other end along the axial direction of the winding body 1310. Further, 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. In this way, the support of each support portion 1315 to the high-voltage coil 1320 is more uniform and stable. Of course, it can also be asymmetrically arranged, which is not specifically limited here.

[0058] Further, at least part of the support portions 1315 are arranged corresponding to the winding grooves 1314. In an application scenario, each of the support portions 1315 in the part is arranged corresponding to one winding groove 1314. For the convenience of description, the support portions 1315 in the part are defined as first support portions, that is, the part of the support portions 1315 includes a plurality of first support portions, each of which is arranged on the other side of the winding plate 1313 where no comb teeth are arranged and between the extension lines of the adjacent two comb teeth corresponding thereto, and the width of each first support portion is substantially equal to the width of the corresponding winding groove 1314 along the axial direction of the winding body 1310. For example, the first narrow support region and the second narrow support region on the winding plate 1313 are both arranged with the first support portions in the above manner, so that the two regions can be better supported by the first support portions corresponding to a section of the coil, further avoiding the deformation of the high-voltage coil 1320. It can be understood that the number and arrangement region of the first support portions are not specifically limited.

[0059] In another application scenario, at least part of the support portions 1315 are arranged corresponding to at least two adjacent winding grooves 1314. Each of the support portions 1315 in the part is arranged corresponding to at least two adjacent winding grooves 1314. For the convenience of description, the support portions 1315 in the part are defined as second support portions, that is, the part of the support portions 1315 includes a plurality of second support portions, each of which is arranged on the other side of the winding plate 1313 where no comb teeth are arranged and between the extension lines of the comb teeth at the two ends of the corresponding plurality of winding grooves 1314, and the width of each second support portion is substantially equal to the sum of the width of the corresponding plurality of winding grooves 1314 along the axial direction of the winding body 1310 and the tooth height of the comb teeth between the corresponding plurality of winding grooves 1314. For example, one second support portion is arranged corresponding to two adjacent winding grooves 1314, the second support portion is located between the extension lines of the comb teeth at the two ends of the corresponding two winding grooves 1314, and the width of the second support portion is substantially 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. For another example, one second support portion is arranged corresponding to three adjacent winding grooves 1314, the second support portion is located between the extension lines of the comb teeth at the two ends of the corresponding three winding grooves 1314, and the width of the second support portion is substantially 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 region, the second wide support region, and the third wide support region are all arranged with the second support portions in the above manner, so that the three regions can be better supported by the second support portions corresponding to the two ends and the middle of the high-voltage coil 1320, further avoiding the deformation of the high-voltage coil 1320. It can be understood that the number and arrangement region of the second support portions can be designed according to specific requirements, which are not specifically limited herein.

[0060] Further, on each winding plate 1313, a plurality of adjacent winding grooves 1314 correspondingly arranged a support part 1315, for example, every two adjacent winding grooves 1314 correspondingly arranged a support part 1315, or every three adjacent winding grooves 1314 correspondingly arranged a support part 1315, so as to reduce the number of support parts 1315, while ensuring the support effect of the high-voltage coil 1320, the structure of the winding plate 1313 is simpler, and the production and manufacturing are facilitated. The width and specific setting position of the support part 1315 can be adjusted according to the support requirement, which is not limited here.

[0061] Through the above setting, the plurality of support parts 1315 on each winding plate 1313 is in a sawtooth structure as a whole. When the winding part 1312 is fixed on the winding tool, and the support part 1315 abuts against the outer peripheral surface of the winding tool, a plurality of channels arranged at intervals will be formed between the winding plate 1313 and the outer peripheral surface of the winding tool, which can be used for the flow of injected silicone rubber raw materials, so that the injection effect is more uniform and the efficiency is higher. Compared with the winding plate without the support part 1315, the side without the comb teeth of the winding plate abuts against the outer peripheral surface of the winding tool as a whole. The winding plate may be damaged due to directly bearing a large injection pressure. In the injection process of the winding plate 1313 of the present application, the silicone rubber raw materials can flow from one side of the winding plate 1313 to the other side through the above-mentioned channels, effectively buffering the impact force of the silicone rubber raw materials on the winding plate 1313, and preventing the winding plate 1313 from being damaged by a large injection pressure.

[0062] Further, the support part 1315 and the winding plate 1313 are smoothly connected, that is, the cross section of each support part 1315 along the radial direction of the winding body 1310 is substantially trapezoidal. The lower base of the trapezoid is connected with the side of the winding plate 1313, and the waist of the trapezoid and the side of the winding plate 1313 are smoothly transitioned, which can improve the connection strength between the support part 1315 and the winding plate 1313. When the width of the support part 1315 is less than the width of the winding groove 1314 corresponding to it, the distance between the bottom surface of the winding groove 1314 and the other side surface of the winding plate 1313 where the support part 1315 is arranged is too small, which weakens the mechanical strength of the winding plate 1313, and the winding plate 1313 is difficult to withstand the large injection pressure in the process of injecting the high-voltage insulating layer 1330 and is damaged.

[0063] In the present embodiment, the winding plate 1313 is made of glass fiber impregnated epoxy resin. After a plurality of layers of glass fiber cloth are impregnated with epoxy resin and stacked to a certain thickness, a rectangular glass steel plate part is formed by mold curing, and the winding grooves 1314 and the support parts 1315 are formed by turning, thereby forming the winding plate 1313. The material is most economical, and the cost can be saved. In other embodiments, the comb-shaped winding plate can be directly formed by integral casting and curing, which simplifies the process, and the material of the winding plate is consistent with the foregoing, which will not be described again.

[0064] The winding body 1310 further comprises a plurality of auxiliary members 1311 arranged in a ring shape and spaced along the axial direction of the winding body 1310, and the auxiliary members 1311 are clamped and connected with the winding plate 1313. The winding body 1310 eliminates the structure of the rigid insulating inner liner, so that the heat conduction effect of the high-voltage winding 130 is better, and the interface between the high-voltage insulating layer of the traditional high-voltage winding and the rigid insulating inner liner is eliminated, thereby suppressing the surface discharge of the rigid insulating inner liner, and saving materials and reducing costs.

[0065] The winding plate 1313 is fixedly arranged along the axial direction of the auxiliary member 1311 at the inner periphery of the plurality of auxiliary members 1311, so that the winding plate 1313 simultaneously connects all the auxiliary members 1311, and the plurality of winding plates 1313 are uniformly distributed along the circumferential direction of the auxiliary member 1311. Among them, the axial direction of the auxiliary member 1311, the axial direction of the winding part 1312, the axial direction of the winding body 1310, and the axial direction of the high-voltage winding 130 are in the same direction. The auxiliary member 1311 can be a circular ring or an elliptical ring, which can be designed according to the overall shape of the high-voltage winding 130. The auxiliary member 1311 can keep the winding plate 1313 stably arranged, avoid the winding plate 1313 from moving and being misaligned during the wire winding process and during the injection of the high-voltage insulating layer 1330, causing the high-voltage coil 1320 to deviate and affecting the quality of the high-voltage winding 130; compared with the winding body structure in which the winding plate is fixed outside the auxiliary member, in the present application, the winding plate 1313 is fixed inside the auxiliary member 1311, and all the winding plates 1313 can be tightened to the theoretical position outside the winding tool by the tensioning force of the wire winding, without the need for the auxiliary member 1311 to provide corresponding support, so that the auxiliary member 1311 and the winding plate 1313 can be stably assembled without the need for individual grinding of the auxiliary member 1311 and the winding tool, thereby greatly saving labor, improving assembly efficiency, and effectively preventing the winding part 1312 from moving on the surface of the winding tool, thereby preventing the high-voltage coil 1320 from being deformed due to uneven injection pressure, and ensuring the quality of the high-voltage winding 130.

[0066] The auxiliary piece 1311 and the winding plate 1313 are correspondingly provided with clamping grooves, and are connected by the clamping grooves matched with each other. The inner surface of the auxiliary piece 1311 is provided with a plurality of first clamping grooves 1316, and the plurality of first clamping grooves 1316 are uniformly arranged along the circumference of the auxiliary piece 1311, and the number of the first clamping grooves 1316 is equal to the number of the winding plates 1313. The side of the plurality of winding plates 1313 provided with the comb teeth is correspondingly provided with a plurality of second clamping grooves 1317, and the plurality of second clamping grooves 1317 are arranged at intervals along the length direction of the winding plate 1313, and the number of the second clamping grooves 1317 is equal to the number of the auxiliary pieces 1311. The plurality of winding plates 1313 are correspondingly clamped in the first clamping grooves 1316 of the plurality of auxiliary pieces 1311 through the second clamping grooves 1317, so that the plurality of winding plates 1313 are uniformly distributed in the inner circumferences of the plurality of auxiliary pieces 1311 in the circumferential direction. At the same time, the first clamping grooves 1316 on all the auxiliary pieces 1311 are one-to-one matched in the axial direction of the auxiliary piece 1311, so that each winding plate 1313 can be arranged in the axial direction of the auxiliary piece 1311, and then the wires are wound in the comb teeth of the winding plate 1313 to form the high-voltage coil 1320, that is, the plurality of sections of the high-voltage coil 1320 are arranged at intervals in the axial direction of the winding part 1312, and the stress is balanced, and the mechanical strength is good.

[0067] In the embodiment, the plurality of auxiliary pieces 1311 include two first auxiliary pieces 13111 and at least one second auxiliary piece 13112, and the first auxiliary piece 13111 is clamped at the end of the winding plate 1313, and the second auxiliary piece 13112 is clamped at the middle of the winding plate 1313. Figure 5 、 Figure 7 and Figure 8 As shown in the drawings, the first auxiliary piece 13111 is clamped at the end of the winding plate 1313, and the second auxiliary piece 13112 is clamped at the middle of the winding plate 1313. In other embodiments, the number of the first auxiliary piece and the second auxiliary piece can be adjusted according to the design requirements of the high-voltage winding, for example, two first auxiliary pieces, two or three or more second auxiliary pieces, the first auxiliary piece is clamped at the end of the winding plate, and a plurality of second auxiliary pieces are clamped at the middle of the winding plate in the axial direction of the winding body; and the first auxiliary piece can also be clamped at the middle of the winding plate, and the second auxiliary piece can also be clamped at the end of the winding plate, as long as the comb tooth structure of the winding plate is correspondingly adjusted, which is not limited specifically herein.

[0068] The inner surface of the first auxiliary member 13111 is provided with a plurality of first clamping grooves 1316, and the winding groove 1314 at the end of the winding plate 1313 is provided with a second clamping groove 1317, so that when the winding plate 1313 is installed in the first clamping groove 1316 of the first auxiliary member 13111, the first auxiliary member 13111 can abut against the inner wall of the comb teeth at the end of the winding plate 1313, which can ensure that the connection between the first auxiliary member 13111 and the winding plate 1313 is more secure, 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 member 13112 is provided with a plurality of first clamping grooves 1316, and the top of the comb teeth in the middle of the winding plate 1313 is provided with a second clamping groove 1317, so that when the winding plate 1313 is installed in the first clamping groove 1316 of the second auxiliary member 13112, it does not affect the winding of the coil in the winding groove 1314 in the middle of the winding plate 1313.

[0069] The width of the first clamping groove 1316 along the circumferential direction of the auxiliary member 1311 is defined as the groove width of the first clamping groove 1316, the width of the second clamping groove 1317 along the length direction of the winding plate 1313 is defined as the groove depth of the second clamping groove 1317, and the width of the winding plate 1313 along the circumference of the winding body 1310 is defined as the thickness of the winding plate 1313. The groove width of the first clamping groove 1316 matches the thickness of the winding plate 1313, and the groove depth of the second clamping groove 1317 matches the thickness of the auxiliary member 1311 at the first clamping groove 1316, so that the winding plate 1313 and the auxiliary member 1311 are firmly assembled, avoiding the situation that when the groove width of the first clamping groove 1316 is less than the thickness of the winding plate 1313 or the groove depth of the second clamping groove 1317 is less than the thickness of the auxiliary member 1311 at the first clamping groove 1316, the winding plate 1313 is difficult to fix on the auxiliary member 1311, and also avoiding the situation that when the groove width of the first clamping groove 1316 is greater than the thickness of the winding plate 1313 or the groove depth of the second clamping groove 1317 is greater than the thickness of the auxiliary member 1311 at the first clamping groove 1316, the winding plate 1313 cannot be stably matched and falls off from the inside of the auxiliary member 1311.

[0070] Further, the winding plate 1313 is fixed with the auxiliary member 1311 by an adhesive, i.e. the second clamping groove 1317 of the winding plate 1313 is fixedly connected in the first clamping groove 1316 of the auxiliary member 1311 by the adhesive, which can make the connection between the winding plate 1313 and the auxiliary member 1311 more stable. The adhesive is a two-component high-temperature-resistant epoxy adhesive, and of course it can also be other adhesive, but it needs to ensure that the adhesive can firmly bond the winding plate 1313 and the auxiliary member 1311, and the adhesive needs to be high-temperature-resistant to adapt to the high-temperature injection of the high-voltage insulation layer 1330 covering the winding plate 1313 and the auxiliary member 1311.

[0071] Further, each first auxiliary piece 13111 is provided with a plurality of first grooves 1318 on the side surface of the end comb teeth of the winding plate 1313, the plurality of first grooves 1318 are in one-to-one correspondence with the plurality of first clamping grooves 1316 and are also provided in correspondence with the plurality of winding plates 1313, for accommodating the comb teeth at the end of the winding plate 1313. The plurality of first grooves 1318 are radially arranged along the first auxiliary piece 13111 and uniformly distributed along the circumference of the first auxiliary piece 13111, the length of the first grooves 1318 along the radial direction of the first auxiliary piece 13111 can be correspondingly arranged according to the length of the comb teeth at the end of the winding plate 1313, the width of the first grooves 1318 along the circumferential direction of the first auxiliary piece 13111 matches the thickness of the winding plate 1313, and the depth of the first grooves 1318 along the axial direction of the first auxiliary piece 13111 matches the tooth height of the comb teeth at the end of the winding plate 1313, so that when the second clamping grooves 1317 at the end of the winding plate 1313 are fixedly connected in the first clamping grooves 1316 of the first auxiliary piece 13111, the comb teeth at the end of the winding plate 1313 can be accommodated in the first grooves 1318, and the two end surfaces of the winding plate 1313 are flush with the mutually distant surfaces of the two first auxiliary pieces 13111. Compared with the winding part structure of the winding plate protruding from the surface of the auxiliary piece, the structure of the present application can effectively avoid the impact of the injection impact force generated when the high-temperature vulcanized silicone rubber is injected outside the winding body 1310 on the comb teeth at the end of the winding plate 1313, thereby causing the winding plate 1313 to deviate or even be damaged, affecting the quality of the high-voltage winding 130.

[0072] Further, a limiting block 1417 is arranged between two adjacent comb teeth at the end of the winding plate 1313, and the limiting block 1417 is arranged along the radial direction of the first auxiliary member 13111. Correspondingly, a plurality of second grooves are arranged on the other side plate surface of the first auxiliary member 13111, and the plurality of second grooves are arranged corresponding to the plurality of winding plates 1313, and are used for clamping connection with the limiting block 1417, that is, the plurality of second grooves are arranged along the radial direction of the first auxiliary member 13111 and are uniformly distributed along the circumferential direction of the first auxiliary member 13111, that is, the plurality of second grooves also one-to-one correspond to the plurality of first clamping grooves 1316 and the plurality of first grooves 1318. The length of the second groove along the radial direction of the first auxiliary member 13111 can be arranged corresponding to the length of the limiting block 1417 along the radial direction of the winding body 1310, and the specific design can be designed according to the connection requirement 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, and the distance between the comb teeth at the end of the winding plate 1313 and the adjacent limiting block 1417 is equal to the distance between the groove bottoms of the first groove 1318 and the second groove on the first auxiliary member 13111. In this way, the first auxiliary member 13111 can be stably clamped on the limiting block 1417 through the second groove 1417, and the connection strength between the first auxiliary member 13111 and the winding plate 1313 is further improved.

[0073] Further, a plurality of flow-through grooves 1319 are arranged on the inner side of the first auxiliary member 13111, so that the injected silicone rubber raw material can flow from the end of the winding portion 1312 to the inner side of the winding portion 1312 during the injection molding process of the high-voltage insulating layer 1330, and then the high-voltage insulating layer 1330 can fully fill the gap between the winding portion 1312 and the high-voltage coil 1320 and the two ends of the winding portion 1312. In the embodiment, four flow-through grooves 1319 are arranged symmetrically on the inner side of the first auxiliary member 13111, which can make the injected silicone rubber raw material flow more uniformly and improve the injection quality. In other embodiments, the flow-through grooves can also be one, two, three or more, or can be arranged asymmetrically, which is not limited here.

[0074] The width of the auxiliary member 1311 along the radial direction of the winding body 1310 is defined as the width of the auxiliary member 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 member 13111 mainly fixes the two ends of the winding plate 1313, and the second auxiliary member 13112 assists in fixing the middle part of the winding plate 1313, the width of the first auxiliary member 13111 is set to be greater than the width of the second auxiliary member 13112. In this way, the amount of material used can be reduced while ensuring the stable assembly of the winding part 1312, thereby reducing costs. The width of the first auxiliary member 13111 is approximately equal to the width of the winding plate 1313. On the one hand, this can ensure the stable assembly of the winding part 1312 and prevent the winding plate 1313 from being damaged due to the high injection pressure during the injection of the high-voltage insulation layer 1330. On the other hand, the first auxiliary member 13111 can also serve as a limiting member for the coils wound in the winding slots 1314 at the ends of the winding plate 1313, thereby preventing the displacement of the wires and affecting the quality of the high-voltage winding 130. The width of the second auxiliary member 13112 can be less than the width of the winding plate 1313, for example, it can be one-half or one-third of the width of the winding plate 1313. In this way, the second auxiliary member 13112 can assist in fixing the winding plate 1313 without affecting the extraction of the tap from the middle part of the winding plate 1313.

[0075] Further, the middle part of the first auxiliary member 13111 is provided with a plurality of first air channel holes 1511, which are spaced apart along the circumferential direction of the winding body 1310 and used for assisting in fixing the air channel member. Specifically, the first air channel holes 1511 are through holes, and the plurality of first air channel holes 1511 and the plurality of pads 1410 are correspondingly arranged on the same circumferential surface of the winding body 1310, and the first air channel holes 1511 are located between the adjacent two winding plates 1313 on which the pads 1410 are mounted. That is, the distance between the first air channel holes 1511 and the inner side wall of the first auxiliary member 13111 is equal to the distance between the pad 1410 and the other side wall of the winding plate 1313 on which the comb teeth are not arranged. The size of the first air channel holes 1511 along the radial direction of the winding body 1310 is equal to the width of the pad 1410, and the size of the first air channel holes 1511 along the circumferential direction of the winding body 1310 is less than or equal to the distance between the corresponding pads 1410 on the adjacent two winding plates 1313. In this way, the air channel member can be correspondingly inserted into the first air channel holes 1511 on the two first auxiliary members 13111, so that it can be stably mounted in the mounting space between the adjacent two winding plates 1313 on which the pads 1410 are arranged without being interfered by the pads 1410. This can prevent the air channel member from being loosened and displaced due to the impact of the high injection pressure during the injection of the high-voltage insulation layer 1330, thereby affecting the quality of the air channel and the forming quality of the high-voltage insulation layer 1330.

[0076] Further, the middle part or the outer side plate surface of the second auxiliary member 13112 is provided with a plurality of second air passage holes 1512 corresponding to the plurality of first air passage holes 1511, which are used to further assist in fixing the air passage member. It can be understood that when the width of the second auxiliary member 13112 is greater than the distance between the first air passage hole 1511 and the inner side wall of the first auxiliary member 1311, the second air passage hole 1512 can be arranged in the middle part of the second auxiliary member 13112; when the width of the second auxiliary member 13112 is slightly smaller than the distance between the first air passage hole 1511 and the inner side wall of the first auxiliary member 1311, the second air passage hole 1512 can be arranged on the outer side plate surface of the second auxiliary member 13112, that is, the second air passage hole 1512 is a groove-shaped hole. The position distribution of the second air passage hole 1512 is similar to that of the first air passage hole 1511, which will not be described here.

[0077] Further, the contour shape of the first air passage hole 1511 and the second air passage hole 1512 matches the cross-sectional shape of the air passage member, so that the air passage member can be more stably 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.

[0078] In the present embodiment, one pad 1410 is arranged in each winding groove 1314 of the fourteen winding plates 1313, and correspondingly, thirteen first air passage holes 1511 are arranged in the middle part of the first auxiliary member 13111 in a ring shape, and thirteen second air passage holes 1512 are arranged on the outer side plate surface of the second auxiliary member 13112, so that each group of first air passage holes 1511 and second air passage holes 1512 is arranged between the fourteen winding plates 1313, that is, in the fourteen winding plates 1313, no first air passage hole 1511 and second air passage hole 1512 is arranged between two adjacent winding plates 1313, so as to leave a space for guiding the lead wire to pass through the adjacent two winding grooves. When the winding plate 1313 is fixedly connected with the auxiliary member 1311, an installation space of the air passage member can be formed between the two winding plates 1313 adjacent to the two sides of any group of first air passage holes 1511 and second air passage holes 1512, so that thirteen air passages can be formed after the high-voltage winding 130 is formed, so that the high-voltage winding 130 can realize uniform and rapid heat dissipation, thereby improving the operation reliability of the product. In other embodiments, two, three or more pads can be arranged in each winding groove of the winding plate, and two, three or more air passage holes can be arranged on the auxiliary member, so that more layers of air passages can be formed. The specific adjustment can be made according to the air passage design of the high-voltage winding, which will not be limited here.

[0079] The winding body 1310 further comprises a plurality of supporting members 1610 fixed at the inner periphery of the auxiliary member 1311 along the circumferential direction of the winding body 1310, and the length direction of the supporting member 1610 is arranged along the axial direction of the winding body 1310. Specifically, the inner surface of each auxiliary member 1311 is further provided with a plurality of third clamping grooves 1611, and the supporting member 1610 is a rectangular rod member, the length of which along the axial direction of the winding body 1310 is the same as that of the winding plate 1313. The supporting member 1610 is clamped and fixed at the inner periphery of the auxiliary member 1311 through the third clamping groove 1611, so that when the wire is wound, the supporting member 1610 can abut against the winding tool and stably support the inner side of each coil, avoiding the coil from being retracted due to the winding tension, and ensuring the winding quality of the high-voltage coil 1320. When the other side of the winding plate 1313 is provided with a plurality of supporting portions 1315, the side of the supporting member 1610 abutting against the winding tool can also be provided with a plurality of supporting portions 1315 to further ensure the supporting effect. The specific arrangement of the supporting portion 1315 is as described above and will not be repeated here. In other embodiments, the supporting member can be provided with a plurality of fourth clamping grooves, and each auxiliary member can be clamped and fixed at the outer periphery of the supporting member through the fourth clamping groove, or the first auxiliary member can be provided with a plurality of third clamping grooves, and the supporting member can be provided with a fourth clamping groove at the middle portion, so that each supporting member can be fixed at the inner periphery of the auxiliary member. The specific arrangement is not limited here.

[0080] Further, the plurality of supporting members 1610 are symmetrically distributed along the central axis section of the winding body 1310, so that the supporting effect of each supporting member 1610 on 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 affects the quality of the high-voltage winding 130. The plurality of supporting members 1610 can include two, four, six or more supporting members 1610, and the plurality of supporting members 1610 can be distributed at the inner periphery of the two sides of the auxiliary member 1311 or uniformly distributed at the inner periphery of the auxiliary member 1311, as long as uniform support for the wire can be achieved. The specific arrangement is not limited here.

[0081] In the present embodiment, the auxiliary member 1311 is also made of glass fiber impregnated epoxy resin, which is formed by impregnating a plurality of layers of glass fiber cloth with epoxy resin, then stacking to a certain thickness, and then molding and curing to form a glass steel member; the winding plate 1313 and the auxiliary member 1311 are separately formed and then clamped and fixed by adhesion.

[0082] The winding body 1310 is made of the above-mentioned fiber-reinforced composite material, which has the characteristics of light weight and high strength, so that the winding body 1310 has good mechanical strength and can effectively support the winding of the wire, is not easy to be damaged, and avoids the injection impact force generated when the high-temperature vulcanized silicone rubber is injected outside the winding body 1310 from dispersing and displacing the wire; and the fiber-reinforced composite material has good heat resistance, avoiding deformation of the winding body 1310 due to excessive heat generated by the high-voltage coil 1320 during operation of the dry-type transformer 10.

[0083] In combination Figure 5 , Figure 6 , Figure 11 , Figure 13 and Figure 14 As shown in FIGS. 1-3, the high-voltage coil 1320 is formed by winding the wire circumferentially on the outer circumferential surface of the winding body 1310. Specifically, the wire is wound in the winding groove 1314 of the winding portion 1312, so that the high-voltage coil 1320 is distributed at intervals in the axial direction of the winding body 1310, and the wire forms two circumscribed circles at the beginning and end of the winding, which are the first circumscribed circle D and the second circumscribed circle X, respectively. The first circumscribed circle D is used to connect the cable, and the second circumscribed circle X is used to connect other external wires, such as in a three-phase transformer, to connect with each other between the phase transformers. The wire is led out six taps in the middle of the winding body 1310 along its axial direction, which are tap 2, tap 3, tap 4, tap 5, tap 6, and tap 7, respectively. The six taps form tap switches. For ease of description, tap 2, tap 4, and tap 6 are defined as the first tap switch, and tap 3, tap 5, and tap 7 are defined as the second tap switch.

[0084] In an application scenario, the wires are wound in a pie winding method, and only one pie-shaped coil is arranged in each winding slot 1314, so that each coil segment has only one pie-shaped coil. The wires include a first wire and a second wire, both of which are continuous wires, and the first wire and the second wire are both coated with an insulating layer, which can be a polyimide film or a glass fiber film, or other insulating materials such as polyester paint, or a combination of multiple insulating materials, which is not limited herein. For convenience of description, the upper end of the winding part 1312 when the high-voltage winding 130 is vertically placed is defined as the first end, and the lower end of the winding part 1312 is defined as the second end. The first wire is wound from the first end of the winding part 1312 to the middle of the winding body 1310 along the axial direction of the winding body 1310, and three taps are led out. The first wire is wound from the first end of the winding part 1312 to the second end of the winding part 1312, and the first wire is wound in the first winding slot 1314 corresponding to one turn on all winding plates 1313 to form an inner coil of the first coil segment 1321, and then a spacer 1410 is installed in the winding slot 1314, that is, each spacer 1410 is respectively clamped on the limiting step 1412 of the second comb tooth corresponding to all winding plates 1313 through the installation slot 1413, and then the first wire is introduced into the cross-line slot 1414 from the wire inlet 1415 on one of the spacers 1410 provided with the cross-line slot 1414 and led out from the wire outlet 1416, and then the first wire is wound in the winding slot 1314 to form an outer coil of the first coil segment 1321. The inner turn wire end of the first coil segment 1321 (i.e., the first end of the first wire) is the first external D, and the outer turn wire end of the first coil segment 1321 extends into the second winding slot 1314 corresponding to one turn on all winding plates 1313 to form an inner coil of the second coil segment 1322, and then a spacer 1410 is installed and an outer coil of the second coil segment 1322 is wound, and the process is repeated until the first wire is wound to the middle of the winding body 1310 to form a plurality of coil segments, and the outer turn wire ends of three coil segments are respectively led out as the tap 6, the tap 4 and the tap 2 as shown in FIG. 6, and the winding of the first wire is completed. Figure 13

[0085] ​The second wire is wound from the middle of the winding part 1312 to the second end of the winding part 1312 along the axial direction of the winding body 1310, and leads out another three taps. Specifically, the second wire starts to be wound in the next winding groove 1314 adjacent to the tap 2, forming a third segment coil 1323, and the second wire continues to be wound to the second end of the winding part 1312 in the same manner as the first wire, and leads out another three taps, i.e., the tap 3, the tap 5 and the tap 7, from the three segment coils starting from the third segment coil 1323 during the winding process, until the second wire is wound to the corresponding last winding groove 1314 on each winding plate 1313 at the second end of the winding part 1312 and forms a terminal segment coil 1324. The outer turn wire end of the terminal segment coil 1324, i.e., the end of the second wire, is the second external X, and the winding of the second wire is completed.

[0086] During the winding of the wire, the wire is wound in the corresponding winding groove 1314 on all the winding plates 1313, so that each segment coil formed by the winding of the wire is perpendicular to the axial direction of the winding body 1310, the winding is convenient, the wire is arranged neatly, the winding plates 1313 are uniformly stressed, and the mechanical strength is good.

[0087] In this way, the pie-type high-voltage coil 1320 is formed, which has good mechanical strength and strong resistance to the electric power generated by the short-circuit current, has more pie numbers and better heat dissipation capacity compared with the layer-type coil. Moreover, in the axial direction of the winding body 1310, the first tap changer and the second tap changer are arranged in parallel, and the six taps form the tap device of the high-voltage coil 1320, which is used to adjust the voltage according to different operating conditions of the dry-type transformer 10. Of course, in other embodiments, a layer-type coil can also be used.

[0088] The wire is wound on the winding body 1310 to form the high-voltage coil 1320, and the high-voltage coil 1320 is annular. The width of the high-voltage coil 1320 is defined as the width of the high-voltage coil 1320, and the width of the high-voltage coil 1320 in each radial cross section is uniform, so that the overall stress of the high-voltage coil 1320 is balanced. Of course, considering the actual operation, the width of each coil in its radial cross section can also not be exactly the same, as long as it is approximately the same.

[0089] In this embodiment, the tap changer includes six taps, and the dry-type transformer 10 has five positions to adjust the voltage. In other embodiments, the tap changer can include four taps, i.e., the first tap changer and the second tap changer each include two taps, and the dry-type transformer includes three positions to adjust the voltage, as long as it meets the actual use requirements of the dry-type transformer, which is not limited herein.

[0090] As shown in FIG. 6, the first tap changer and the second tap changer are arranged in parallel in the axial direction of the winding body 1310, and the six taps form the tap device of the high-voltage coil 1320. Figure 11 and Figure 12As shown, the high-voltage insulating layer 1330 wraps the high-voltage coil 1320 and the winding body 1310 to form the high-voltage winding 130. The high-voltage insulating layer 1330 is high-temperature vulcanized silicone rubber. The wire is wound on the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 and the high-voltage coil 1320 are used as an injection body. The injection body is placed in an injection mold. By adding silicone rubber raw materials, the high-temperature vulcanized silicone rubber is injected around the injection body to obtain the high-voltage winding 130. The high-voltage insulating layer 1330 uses high-temperature vulcanized silicone rubber, which improves the insulation performance and mechanical properties of the high-voltage winding 130 as a whole.

[0091] In this application, the high-temperature vulcanized silicone rubber uses a high-temperature vulcanized silicone rubber material system, which specifically includes raw rubber, reinforcing agent, flame retardant, heat-resistant agent, and other auxiliary materials.

[0092] Before the high-temperature vulcanized silicone rubber is injected as a whole, the air passage piece needs to be installed. Several air passage pieces are installed on each auxiliary piece 1311 through corresponding air passage holes. A tool connecting piece can be provided on the injection mold. The tool connecting piece is provided with a protection cavity corresponding to the six taps. The taps are fixed in the protection cavity, and the remaining space in the protection cavity is filled by bolts and other connecting pieces, so that the six taps cannot be covered by silicone rubber during the injection process and cannot be used for wiring.

[0093] After the high-temperature vulcanized silicone rubber is injected as a whole to cover the high-voltage coil 1320 and the winding body 1310, 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 in the form of a hollow column as a whole, and the air passage piece is pulled out to form several axial air passages in the high-voltage insulating layer 1330.

[0094] The high-voltage winding 130 of the present application is provided with a high-voltage insulation layer 1330 of high-temperature vulcanized silicone rubber outside the high-voltage coil 1320, which has the following advantages compared with the high-voltage insulation layer of epoxy resin in the prior art: 1) good fireproof performance, low-temperature resistance, aging resistance and short-circuit test capability, which can effectively prolong 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 green and environmentally friendly; 3) the silicone rubber elastomer can weaken the partial discharge inducement caused by mechanical vibration, has an inhibitory effect on equipment discharge, and the product of the silicone rubber under the action of discharge is non-conductive silicon dioxide, which can effectively inhibit the continuous deterioration of the insulation; 4) can reduce the operating loss of the transformer, and is more energy-saving; 5) has good ability to resist harsh environments and can be installed indoors and outdoors. At the same time, the present application is formed by overall high-temperature vulcanization injection molding, which is more stable than the existing room temperature vulcanization, has higher mechanical properties, and has better adhesion to the high-voltage coil 1320 and the winding body 1310, which can effectively prolong the service life of the high-voltage insulation layer 1330. And compared with liquid silicone rubber, the high-temperature vulcanized silicone rubber of the present application has uniform filler dispersion, and will not cause partial discharge of the dry-type transformer 10 due to filler agglomeration, so that the overall performance of the dry-type transformer 10 is better.

[0095] In the present embodiment, as shown in Figure 14 The high-voltage winding 130 is cut along its axial direction, and the conductive wire is wound in the comb-shaped winding plate 1313 by the above-mentioned winding method to form a pie-type high-voltage coil 1320. In the axial direction of the high-voltage winding 130, the pie-type high-voltage coil 1320 is arranged at intervals with the combs of the winding plate 1313, that is, a pie coil is arranged between two adjacent combs. In other embodiments, the conductive wire can also form a high-voltage coil by other winding methods, as long as the structure of the winding part is adjusted accordingly, which is not specifically limited here.

[0096] The technical content and technical features of the present application have been disclosed as above, however, it can be understood that under the creative idea of the present application, those skilled in the art can make various changes and improvements to the above-mentioned structure and material, including the combination of the technical features disclosed or claimed herein, and obviously including other combinations of these features. These modifications and / or combinations all fall within the technical field to which the present application relates, and fall within the protection scope of the claims of the present application.

Claims

1. A pad for preparing a high-voltage winding with air passages, the winding body of the high-voltage winding comprising a plurality of winding plates, the winding plates having a plurality of winding grooves forming a plurality of comb teeth on one side for winding wires, characterized in that, The cushion block is an arc block, the arc of the cushion block matches the peripheral surface of the winding body, the length direction of the cushion block is arranged along the circumferential direction of the winding body, and in the length direction of the comb tooth, the cushion block is located at the middle part of the comb tooth, so as to separate the wires wound on the comb tooth to form the mounting space of the air duct piece.

2. The pad of claim 1, wherein The cushion block is clamped and connected at the middle part of the comb tooth.

3. The pad of claim 2, wherein Two sides of the comb tooth are provided with L-shaped grooves, 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 respectively formed at the two sides of the middle part of the comb tooth, for mounting the cushion block.

4. The pad of claim 3, wherein A mounting groove is arranged at the middle part of one side of the cushion block, the mounting groove is arranged along the radial direction of the winding body, and the cushion block is clamped on the limiting step of the comb tooth through the mounting groove.

5. The pad of claim 4, wherein The height of the mounting groove on the cushion block is slightly smaller than or equal to the width of the winding groove along the axial direction of the winding body.

6. The pad of claim 4, wherein The bottom wall of the mounting groove is provided with a rounded corner structure at both ends, and / or the two sides of the cushion block along the length direction of the cushion block are provided with an inverted bevel structure.

7. The pad of claim 4 wherein, The other side of the cushion block without the mounting groove is provided with a wire crossing groove, the wire crossing groove is arranged obliquely, so that the bottom side of one end of the cushion block forms a wire inlet, and the top side of the other end of the cushion block forms a wire outlet.

8. The pad of claim 7, wherein The size of the wire inlet and the wire outlet is greater than the cross-sectional dimension of the wire.

9. The pad of claim 7, wherein The wire inlet is located on the inner side surface of one end of the cushion block close to the bottom of the comb tooth, and the wire outlet is located on the outer side surface of the other end of the cushion block away from the bottom of the comb tooth. Alternatively, the wire inlet is located on the bottom side of the end surface of one end of the cushion block, and the wire outlet is located on the top side of the end surface of the other end of the cushion block. Alternatively, the wire inlet is located on the inner side surface of one end of the cushion block close to the bottom of the comb tooth, and the wire outlet is located on the top side of the end surface of the other end of the cushion block. Alternatively, the wire inlet is located on the bottom side of the end surface of one end of the cushion block, and the wire outlet is located on the outer side surface of the other end of the cushion block away from the bottom of the comb tooth.

10. The pad of claim 7, wherein The depth of the wire crossing groove matches the width of the wire, and the width of the wire crossing groove matches the thickness of the wire.

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