High-voltage winding, mold assembly and manufacturing method of high-voltage winding

Abstract

The high-voltage winding comprises a winding body, a high-voltage coil and a high-voltage insulating layer, the winding body comprises a plurality of winding plates and a plurality of fixing rings, the winding plates are connected with the fixing rings in a clamped mode, and a plurality of first mounting holes and a plurality of second mounting holes are formed in the fixing rings and used for allowing air channel pieces to penetrate through; the wire is wound on the winding body to form a high-voltage coil, the high-voltage coil comprises a plurality of cake type coils, and the high-voltage insulating layer wraps the high-voltage coil and the winding body; the high-voltage winding further comprises a plurality of air channels, and the air channels are arranged in the axial direction of the high-voltage winding and penetrate through the high-voltage insulating layer. The high-voltage winding is a high-voltage encapsulated cake type winding, and the axial air channels are arranged in the high-voltage winding, so that the high-voltage winding can dissipate heat through the inner and outer surfaces and the axial air channels in the high-voltage winding, the heat dissipation efficiency is higher, the high-voltage winding can be applied to a large-capacity dry type transformer with higher heat dissipation requirements, the application range is wider, and the cost is lower. The invention further discloses a mold assembly and a manufacturing method of the high-voltage winding.

Description

Technical Field

[0001] The present application relates to the technical field of power transformers, and in particular to a high-voltage winding, a mold assembly, and a method for manufacturing the high-voltage winding. Background Art

[0002] The high-voltage encapsulated winding of a dry-type transformer usually only has the inner and outer surfaces as the heat dissipation area, and the heat dissipation efficiency is low, which makes the high-voltage winding easy to overheat during operation, affecting its performance stability and life. At present, the way to improve the heat dissipation performance of the high-voltage winding is usually to set a heat dissipation air duct inside it. High-voltage windings can generally be divided into two categories according to the different coil structures: layer windings and pancake windings.

[0003] Among them, the layered winding adopts a segmented winding method, and its airway setting technology is relatively mature, that is, the wire is first wound at several preset positions on the winding body according to a predetermined number of turns and then cut to obtain several sections of coils, the predetermined number of turns is less than the full number of turns; then, several airway rods are placed at intervals along the axial direction of the outer periphery of each section of the coil; then, the wire of each section of the coil is continued to be wound to the full number of turns on the outer periphery of the airway rod according to the above method, and the wires of each section of the coil located on the inner and outer sides of the airway rod are welded respectively to obtain a high-voltage coil; finally, after the high-voltage insulation layer is formed, the airway rod is pulled out to form a heat dissipation airway.

[0004] The pancake winding generally adopts the continuous winding method, that is, after a pancake coil is wound according to the full number of turns, the wire is not cut and the next pancake coil is wound until all coils are wound. Since the number of wire segments of the pancake winding is much more than that of the layer winding, if the above method is used to manufacture the heat dissipation airway, the wires on both sides of the airway rod of each pancake coil need to be welded, and the welding reliability is greatly reduced; and the gap between two adjacent pancake coils is small, and the wire welding is difficult. Therefore, it is difficult for the pancake winding to dissipate heat by setting up airways. At present, the existing pancake winding usually adopts the method of increasing the cross-sectional area of ​​the high-voltage coil wire to reduce the wire current density, so as to reduce resistance loss and reduce heat generation, but this method uses more wire and increases material cost; and the cross-sectional area of ​​the high-voltage coil becomes larger, which leads to a larger volume of the dry-type transformer and increases the overall material cost. Summary of the invention

[0005] In view of the deficiencies in the prior art, one of the main objectives of the present application is to provide a high-voltage winding having an axial air duct inside, which can improve the heat dissipation efficiency and ensure the safety and reliability of the high-voltage winding operation.

[0006] In order to solve the above technical problems, the technical solution adopted in this application is: a high-voltage winding, including a winding body, a high-voltage coil and a high-voltage insulation layer, the winding body includes a plurality of winding plates and a plurality of fixing rings, the winding plates are clamped and connected with the fixing rings, and the fixing rings are provided with a plurality of first mounting holes and a plurality of second mounting holes, the first mounting holes and the second mounting holes are used to cooperate with the air duct parts; the wire is wound on the winding body to form a high-voltage coil, the high-voltage coil includes a plurality of pancake coils, and the high-voltage insulation layer wraps the high-voltage coil and the winding body; the high-voltage winding also includes a plurality of air ducts, which are arranged along the axial direction of the high-voltage winding and pass through the high-voltage insulation layer.

[0007] Among them, a plurality of comb teeth are arranged on the winding plate, and the plurality of winding plates are evenly distributed along the circumference of the high-voltage winding, and at least one pancake coil is arranged between two adjacent comb teeth on the winding plate.

[0008] Among them, the several fixing rings include two first fixing rings, and two first slots are correspondingly arranged on the several winding plates. The two first fixing rings are clamped at the two ends of the winding plates through the first slots, and several first mounting holes are arranged between every two first slots.

[0009] Among them, several fixing rings include at least one second fixing ring, and at least one fifth slot is correspondingly provided on several winding plates. The second fixing ring is clamped in the middle of the winding plate through the fifth slot, and several second mounting holes are provided between every two fifth slots.

[0010] The first mounting hole and the second mounting hole have the same shape and quantity, and the first mounting hole and the second mounting hole are arranged correspondingly.

[0011] Among them, the cross-section of the airway piece is capsule-shaped or rounded trapezoidal, and the shapes and sizes of the first mounting hole and the second mounting hole correspond to the cross-section of the airway piece; the outer diameter of one end of the airway piece gradually decreases along the axial direction of the airway piece toward the direction away from the airway piece.

[0012] Among them, at least two layers of insulating support materials are arranged in the high-voltage coil for clamping the airway parts, and the insulating support materials are glass fiber mesh cloth, electrical composite material or silicone cloth.

[0013] Wherein, a lubricating layer is arranged on the outer periphery of the airway component, and the lubricating layer is made of a release agent.

[0014] The second purpose of the present application is to provide a mold assembly, including a core mold, two core shafts, a plurality of fixed plates and a plurality of air duct parts, the two core shafts are fixedly connected at both ends of the core mold along the axial direction of the core mold; a plurality of fixed plates are connected to one of the core shafts, and a through hole and a plurality of third mounting holes are provided on the fixed plate, the through hole is used for passing the core shaft, and the third mounting hole is used for passing the air duct parts in cooperation with the winding body.

[0015] The third object of the present application is to provide a method for manufacturing a high voltage winding, which is used to manufacture a high voltage winding, comprising the following steps:

[0016] Step ①: Assemble the mold assembly and the winding body, and sleeve the winding body on the mold assembly;

[0017] Step ②: Winding the wire on the winding body to form a high-voltage coil, wherein, during the winding process of each coil, after the wire is wound to a first preset number of turns, the airway member is inserted along the axial direction of the winding body to a preset position, and then the wire is wound to a second preset number of turns;

[0018] Step ③: Place the winding body with the high-voltage coil as the body to be injected into the injection machine, inject high-temperature vulcanized silicone rubber around the entire periphery of the body to be injected to form a high-voltage insulation layer, pull out the airway parts, and obtain a high-voltage winding with an axial airway.

[0019] The beneficial effects of the present application are as follows: compared with the prior art, the high-voltage encapsulated pancake-type winding of the present application is provided with an axial air channel inside, so that the high-voltage winding can dissipate heat through its inner surface, outer surface and internal axial air channel, and the heat dissipation efficiency is higher, so that this structure can be applied to large-capacity dry-type transformers with higher heat dissipation requirements, and the application range is wider; and compared with the heat dissipation method of increasing the cross-sectional area of ​​the high-voltage coil wire, reducing the resistance loss, and increasing the surface area, the amount of wire used is reduced and the product cost is reduced.

[0020] At the same time, the winding body of the present application uses a fixed ring to clamp the winding plate and install the air duct parts. The structure is simple and stable, which can prevent the winding plate and air duct parts from moving and misaligning during the wire winding process and the high-voltage insulation layer injection process, affecting the quality of the high-voltage winding.

[0021] In addition, the present application covers the wires in contact with both sides of the airway component with insulating support materials, so that after the airway component is pulled out to form the airway, the wires in the airway will not be exposed to the air, which is beneficial to extending the service life of the high-voltage winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 It is a front view of a dry-type transformer 10 according to one embodiment of the present application;

[0024] Figure 2 is a top view of a dry-type transformer 10 according to an embodiment of the present application;

[0025] Figure 3 is a front view of an assembled core 110 according to an embodiment of the present application;

[0026] Figure 4 yes Figure 2 Enlarged view of G in the middle;

[0027] Figure 5 is a three-dimensional schematic diagram of a high-voltage winding 130 according to an embodiment of the present application;

[0028] Figure 6 It is a three-dimensional schematic diagram of a high-voltage coil 1320 wound on a winding body 1310 according to an embodiment of the present application;

[0029] Figure 7 is a three-dimensional schematic diagram of a winding plate 1311 according to an embodiment of the present application;

[0030] Figure 8 is a schematic circuit diagram of a high voltage coil 1320 according to an embodiment of the present application;

[0031] Fig. 9 is a three-dimensional schematic diagram of a winding body 1310 according to an embodiment of the present application;

[0032] Fig.10 is a three-dimensional schematic diagram of a first fixing ring 1410 according to an embodiment of the present application;

[0033] Fig.11 is a three-dimensional schematic diagram of a second fixing ring 1420 according to an embodiment of the present application;

[0034] Fig.12 It is a three-dimensional schematic diagram of a winding body 1310 according to an embodiment of the present application being sleeved on a mold assembly 200;

[0035] Fig.13 is a three-dimensional schematic diagram of a fixing plate 230 according to an embodiment of the present application;

[0036] Fig.14 It is a schematic diagram of a first pancake coil wound with a wire according to an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] like Figure 1-Figure 3As shown, the dry-type transformer 10 is a three-phase transformer, namely the A-phase, B-phase, and C-phase, that is, the dry-type transformer 10 includes three single-phase transformers 100. According to the different structures of the iron core 110, the three transformers 100 can be arranged to form a linear or triangular structure, and the three transformers 100 are symmetrically structured. The dry-type transformer 10 can be an isolation transformer, a frequency conversion transformer, a test transformer, etc.

[0039] In one embodiment, continue to refer to Figure 1-Figure 3 , the 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 a one-to-one correspondence. The columnar iron core body 111 is formed by stacking multiple layers of silicon steel sheets, and the outside of the multiple layers of silicon steel sheets is fixed by tying with a binding tape. 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 the iron core 110.

[0040] An iron core clamping member 140 is arranged on the outside of the iron core 110. The iron core clamping member 140 is formed by connecting three clamping members to form a structure similar to a channel steel, that is, the iron core clamping member 140 is integrally in a "匚"-shaped structure. Among them, the clamping member located in the middle is arranged close to the iron core 110, and the other two clamping members are arranged in a direction away from the iron core 110.

[0041] Combined with Figure 2 and Figure 4As shown, the low-voltage winding 120 includes a copper foil 121, a low-voltage insulating layer 122 and a support bar 123, and the copper foil 121 and the low-voltage insulating layer 122 are alternately arranged. The copper foil 121 is formed by winding a whole copper foil, and the low-voltage insulating layer 122 and the copper foil 121 are overlapped and wound together, so that the copper foil 121 and the low-voltage insulating layer 122 are alternately arranged. At least one heat dissipation air channel is provided in the low-voltage winding 120, and the heat dissipation air channel is located between adjacent copper foils 121 and low-voltage insulating layers 122, and the support bar 123 is located in the heat dissipation air channel, which is used to support and isolate the adjacent copper foils 121 and low-voltage insulating layers 122. Specifically, the support bar 123 is an insulating support bar 123. When the copper foil 121 and the low-voltage insulating layer 122 are overlapped and wound to a fixed number of turns, the insulating support bar 123 is fixed to the outer surface of the low-voltage insulating layer 122 or the copper foil 121. The overlapping winding is continued so that the low-voltage insulating layer 122 and the copper foil 121 are close to the insulating support bar 123. The insulating support bar 123 can be fixed between the adjacent copper foil 121 and the low-voltage insulating layer 122 by gluing, or can be fixed by the extrusion force generated during winding or other methods. A plurality of insulating support bars 123 are arranged in each layer of the heat dissipation air duct, and the plurality of insulating support bars 123 are arranged at intervals along the circumference of the outer peripheral surface of the copper foil 121, and play the role of supporting the adjacent copper foil 121 and the low-voltage insulating layer 122. There are at least two insulating support bars 123 arranged in each layer of the heat dissipation air duct, and can be two, three, four or more. Preferably, the plurality of insulating support bars 123 of the same layer are evenly spaced along the circumference of the outer peripheral surface of the copper foil 121. After the insulating support strip 123 is provided, the copper foil 121 and the low-voltage insulating layer 122 are continuously wound in an overlapping manner to a predetermined number of turns to form a low-voltage winding 120. The provision of the heat dissipation duct enables the heat generated by the low-voltage winding 120 to be released during the operation of the dry-type transformer 10, thereby preventing the dry-type transformer 10 from overheating and failing. The heat dissipation duct may be provided in one layer, or in two or more layers, which is not limited here.

[0042] See also Figure 5-Figure 7 , Fig. 9 The high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320 and a high-voltage insulating layer 1330; the winding body 1310 is circumferentially arranged on the inner side of the high-voltage winding 130, and the wire is wound on the outer side of the winding body 1310 to form a high-voltage coil 1320, and the high-voltage coil 1320 includes a plurality of coil segments, and the plurality of coil segments are arranged at intervals along the axial direction of the high-voltage winding 130; the high-voltage insulating layer 1330 wraps the high-voltage coil 1320 and the winding body 1310. The high-voltage winding 130 is only provided with the winding body 1310, and no rigid insulating inner liner is provided, and the structure of the rigid insulating inner liner is omitted, so that the heat dissipation effect of the high-voltage winding 130 is better, there is no interface between the high-voltage insulating layer 1330 and the rigid insulating inner liner, and thus there is no discharge on the surface of the rigid insulating inner liner, and materials are saved and costs are reduced.

[0043] In this embodiment, the winding body 1310 includes a plurality of winding plates 1311 and a plurality of fixing rings 1400. The plurality of winding plates 1311 are arranged at intervals and are evenly distributed circumferentially on the inner side of the high-voltage winding 130. Each winding plate 1311 is arranged along the axial direction of the high-voltage winding 130, and a plurality of comb teeth are arranged on the winding plate 1311. The high-voltage coil 1320 adopts a pancake coil, that is, it includes a plurality of pancake coils, and at least one pancake coil is arranged between two adjacent comb teeth on the winding plate 1311. Among them, the number of winding plates 1311 is at least two, that is, it can be two, three, four or more, and there is no limitation here. In order to make the wire winding firm and save materials as much as possible, the number of winding plates 1311 of the 10kV / 1000kVA dry-type transformer is set to twelve.

[0044] The winding plate 1311 is a rectangular plate, and the longer side of the winding plate 1311 is arranged along the axial direction of the high-voltage winding 130. The winding plate 1311 is also provided with a plurality of winding grooves 1312. The plurality of winding grooves 1312 are arranged along the radial direction of the high-voltage winding 130 and are distributed at intervals along the axial direction of the high-voltage winding 130, so that the winding plate 1311 is comb-tooth-shaped, that is, a plurality of comb teeth are formed on the winding plate 1311. The height of the comb teeth on the winding plate 1311 along the axial direction of the high-voltage winding 130 is defined as the tooth height. The tooth height at both ends of the winding plate 1311 and the tooth height in the middle of the winding plate 1311 are greater than the tooth height of other parts. This is because the ends of the high-voltage coil 1320 need to cope with a higher impact voltage. Setting the tooth height at both ends of the winding plate 1311 a little larger can enhance the impact resistance. The middle of the winding plate 1311 needs to lead out the tapping wire joint. Setting the tooth height in the middle of the winding plate 1311 a little larger will increase the distance between the corresponding two adjacent winding grooves 1312, which can leave space for the tap joint led out from the middle of the winding plate 1311. At least one pancake coil is set between two adjacent comb teeth on the winding plate 1311, so that each winding groove 1312 is wound with a wire, the high-voltage coil 1320 is reasonably distributed, and each section of the coil is set at intervals. At the same time, the comb tooth area with a slightly larger tooth height is defined as a high comb tooth area, and the comb tooth area with a slightly smaller tooth height is defined as a low comb tooth area. Then, through the above-mentioned arrangement, the winding plate 1311 forms a first high comb tooth area, a first low comb tooth area, a second high comb tooth area, a second low comb tooth area, and a third high comb tooth area in sequence from one end to the other end along the axial direction of the high-voltage winding 130. Furthermore, there is no specific restriction on the tooth heights of the first high comb tooth area, the second high comb tooth area, and the third high comb tooth area, for example, they can be the same as each other or different. And the first high comb tooth area and the third high comb tooth area can be symmetrically arranged with respect to the second high comb tooth area, and the first low comb tooth area and the second low comb tooth area can also be symmetrically arranged with respect to the second high comb tooth area. Of course, they can also be arranged asymmetrically, which is not limited here.

[0045] When a number of winding plates 1311 are evenly distributed circumferentially, the two ends of all the winding plates 1311 are arranged flush, and the winding grooves 1312 on all the winding plates 1311 are matched one by one in the circumferential direction of the high-voltage winding 130. Each coil is circumferentially wound by a wire in a corresponding circle of winding grooves 1312 on all the winding plates 1311, with balanced force and good mechanical strength.

[0046] In other embodiments, in order to allow for the setting positions of the taps, several winding plates may be fixed in an uneven manner, that is, the distances between two adjacent winding plates are not equal, for example, the distance between two adjacent winding plates is 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, so that the tooth height of the comb teeth in the middle of the winding plate does not need to be set larger, and the setting positions of each tap can be reserved.

[0047] In other embodiments, the winding plate may also be an annular disk disposed circumferentially around the high-voltage winding. A plurality of winding plates are disposed at intervals along the axial direction of the high-voltage winding, and the wire is wound in a groove formed by two adjacent winding plates.

[0048] In this embodiment, the winding plate 1311 is made of glass fiber impregnated with epoxy resin, and multiple layers of glass fiber cloth impregnated with epoxy resin are stacked to a certain thickness, and molded and cured to form a rectangular glass fiber reinforced plastic plate. A winding groove 1312 is opened on the glass fiber reinforced plastic plate, and the winding groove 1312 can be formed by milling to form the winding plate 1311. When winding the wire, the winding plate 1311 can be fixedly connected to the outer peripheral surface of the winding tooling by an adhesive, which saves the most materials and can save costs. Among them, the adhesive is a two-component high-temperature resistant epoxy adhesive, and of course it can also be other adhesives, but it is necessary to ensure that the adhesive can make the winding tooling and the winding plate 1311 firmly bonded, and resistant to high temperatures, so as to adapt to the high-temperature injection of the high-voltage insulation layer 1330 outside the winding body 1310.

[0049] In this embodiment, the winding board 1311 is molded and cured. In other embodiments, the comb-shaped winding board can also be directly formed by integral casting and curing to simplify the process. The material of the winding board is consistent with the above and will not be repeated.

[0050] 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, 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 to disperse and shift the wire; and the fiber-reinforced composite material has good heat resistance, which avoids the high-voltage coil 1320 generating excessive heat during the operation of the dry-type transformer 10 and causing the winding body 1310 to deform.

[0051] See also Figure 7 , Figure 9-11 The fixing ring 1400 is annular, and a plurality of fixing rings 1400 are arranged at intervals along the axial direction of the high-voltage winding 130 and are coaxial with the high-voltage winding 130. The fixing ring 1400 is connected to the winding plate 1311 by clamping. The fixing ring 1400 can maintain the stable setting of the winding plate 1311, and avoid the movement and dislocation of the winding plate 1311 during the wire winding process and the high-voltage insulation layer injection process.

[0052] In this embodiment, the plurality of fixing rings 1400 include two first fixing rings 1410. The shape of the first fixing ring 1410 matches the high-voltage winding 130. It can be a circular ring, an elliptical ring, or other ring shapes. The two first fixing rings 1410 are respectively installed at the two ends of the winding plate 1311. A first clamping groove 1313 is provided at the bottom of the winding groove 1312 at the end of the winding plate 1311 for clamping the first fixing ring 1410. The first clamping groove 1313 is arranged along the side wall of the winding groove 1312 close to the end of the winding plate 1311, so that the first fixing ring 1410 can be arranged close to the side wall of the winding groove 1312 at the end of the winding plate 1311 to ensure the connection strength between the first fixing ring 1410 and the winding plate 1311. For the sake of convenience, the space for winding the wire in the winding groove 1312 at the end of the winding plate 1311 except for the installation of the first fixing ring 1410 is defined as the second clamping groove 1314, that is, on the same winding plate 1311, from one end to the other end, the first clamping groove 1313, the second clamping groove 1314, a plurality of winding grooves 1312, the second clamping groove 1314, and the first clamping groove 1313 are arranged in sequence.

[0053] A plurality of grooves 1411 are provided on the plate surfaces of the two first fixing rings 1410 which are away from each other. The grooves 1411 are arranged along the radial direction of the first fixing ring 1410 and are evenly distributed along the circumference of the first fixing ring 1410. The plurality of grooves 1411 correspond to the plurality of winding plates 1311 one by one. The length of the groove 1411 along the circumference of the first fixing ring 1410 is defined as the width of the groove 1411, and the length of the winding plate 1311 along the circumference of the winding body 1310 is defined as the width of the winding plate 1311. The width of the groove 1411 matches the width of the winding plate 1311. The length of the groove 1411 along the axial direction of the first fixing ring 1410 is defined as the depth of the groove 1411, and the length of the comb teeth on the winding plate 1311 along the axial direction of the winding body 1310 is defined as the width of the comb teeth. The depth of the groove 1411 matches the width of the winding plate 1311. The width of the comb teeth at the end of the winding plate 1311 matches; one end of the winding plate 1311 with the comb teeth is defined as the top of the winding plate 1311, and the other end is the bottom of the winding plate 1311; the length from the top of the winding plate 1311 to the bottom of the winding plate 1311 is defined as the height of the winding plate 1311; the height of the winding plate 1311 matches the ring width of the first fixing ring 1410, so that the comb teeth at the end of the winding plate 1311 can be accommodated in the groove 1411 after the winding plate 1311 is clamped and connected with the first fixing ring 1410.

[0054] The first fixing ring 1410 is provided with a plurality of third card slots 1412 on the inner circumference thereof. The plurality of third card slots 1412 are arranged along the radial direction of the first fixing ring 1410 and correspond to the plurality of winding plates 1311 one by one, and the plurality of third card slots 1412 are connected to the plurality of grooves 1411 one by one. The length of the third card slot 1412 along the radial direction of the first fixing ring 1410 is defined as the length of the third card slot 1412. The length of the third card slot 1412 is the distance from the bottom wall of the first card slot 1313 to the bottom wall of the first card slot 1314. The distance between the bottom end of the winding plate 1311 matches, so that the first fixing ring 1410 can be clamped on the winding plate 1311 through the third clamping groove 1412 and the first clamping groove 1313; the length of the first clamping groove 1313 along the axial direction of the winding plate 1311 is defined as the groove width of the first clamping groove 1313, and the length of the groove 1411 of the first fixing ring 141 along its axial direction is defined as the thickness of the first fixing ring 1410, and the groove width of the first clamping groove 1313 matches the thickness of the first fixing ring 1410. In this way, the first fixing ring 1410 and the first clamping groove 1313 are completely matched in size, so that the first fixing ring 1410 is clamped in the first clamping groove 1313 without adhesive. The length of the bottom wall of the first clamping slot 1313 from the bottom end of the winding plate 1311 is less than the length of the bottom wall of the second clamping slot 1314 from the bottom end of the winding plate 1311, so that the first clamping slot 131 and the second clamping slot 1314 form a step-like structure, which can firmly clamp the first fixing ring 1410 and prevent the first fixing ring 1410 from moving. At least one first mounting hole 1413 is provided between two adjacent third clamping slots 1412 on the first fixing ring 1410, which is used to pass the airway member 240; in this embodiment, two first mounting holes 1413 are provided between two adjacent third clamping slots 1412 on the first fixing ring 1410, and a first mounting hole 1413 may not be provided between a group of two adjacent third clamping slots 1412, which is used as a cross-line channel or a lead-out tap when winding the wire. In other embodiments, the first fixing ring can also be fixed in the first slot by an adhesive, as long as the first fixing ring and the first slot can be fixedly connected, and there is no limitation here; one, three or more first mounting holes can be set between two adjacent third slots on the first fixing ring, and the first mounting holes can also be arbitrarily set on the first fixing ring, as long as the airway component can be stably installed, and there is no limitation here.

[0055] In this embodiment, the plurality of fixing rings 1400 further include a second fixing ring 1420. The shape of the second fixing ring 1420 is the same as that of the first fixing ring 1410, and both are circular, elliptical or other rings. The width of the fixing ring 1400 along the radial direction of the winding body 1310 is defined as the ring width of the fixing ring 1400. The ring width of the second fixing ring 1420 is smaller than the ring width of the first fixing ring 1410, and the inner circumference size of the second fixing ring 1420 is larger than the inner circumference size of the first fixing ring 1410. The outer circumference size of the second fixing ring 1420 is smaller than the outer circumference size of the first fixing ring 1410. The second fixing ring 1420 is arranged in the middle of the winding plate 1311. A fifth slot 1315 is provided in the middle of the winding plate 1311. The fifth slot 1315 is located at the top of a comb tooth in the middle of the winding plate 1313. The second fixing ring 1420 is fixed in the fifth slot 1315, which ensures the effective connection between the second fixing ring 1420 and the winding plate 1311. The width of the second fixing ring 1420 is smaller than the height of the winding plate 1311, which is convenient for leading out the tapping wire when winding the wire, and also convenient for the flow of silicone rubber when injecting the high-voltage insulation layer. A plurality of fourth slots 1421 are provided along the radial direction of the inner circumference of the second fixing ring 1420. The plurality of fourth slots 1421 are evenly distributed, and the number of the fourth slots 1421 is equal to that of the winding plate 1311. The length of the fourth slot 1421 along the circumference of the second fixing ring 1420 is defined as the width of the fourth slot 1421, and the width of the fourth slot 1421 matches the width of the winding plate 1311; the distance from one end of the fourth slot 1421 to the other end along the radial direction of the winding body 1310 is defined as the length of the fourth slot 1421, and the length of the fourth slot 1421 is equal to or slightly less than the length of the fifth slot 1315 from the bottom end of the winding plate 1311; the length of the second fixing ring 1420 along its axial direction is defined as the thickness of the second fixing ring 1420, and the length of the fifth slot 1315 along the axial direction of the winding body 1310 is defined as the height of the fifth slot 1315, and the thickness of the second fixing ring 1420 matches the height of the fifth slot 1315. In this way, the second fixing ring 1420 and the fifth slot 1315 are completely matched in size, so that the second fixing ring 1420 is fixed in the fifth slot 1315 through the fourth slot 1421 without adhesive. Accordingly, no wire is wound in the fifth slot 1315. In other embodiments, a plurality of second fixing rings may be provided, and they may be arranged on the winding board at intervals, which is not limited here.At least one second mounting hole 1422 is provided between two adjacent fourth slots 1421 on the second fixing ring 1420. The second mounting hole 1422 is provided corresponding to the first mounting hole 1413, that is, the two have the same shape and number, and are used to cooperate with the airway member 240 to be inserted; in this embodiment, two second mounting holes 1422 are provided between two adjacent fourth slots 1421 on the second fixing ring 1420, and no second mounting hole 1422 may be provided between one group of two adjacent fourth slots 1421, which is used as a cross-line channel or a lead-out tap when winding the wire. In other embodiments, the second fixing ring and the fifth slot may also be fixed with an adhesive, as long as the second fixing ring and the fifth slot can be fixedly connected, and no limitation is made here; one, three or more second mounting holes may be provided between two adjacent fourth slots on the second fixing ring, and the second mounting holes may also be arbitrarily provided on the second fixing ring, as long as the airway member can be stabilized corresponding to the first mounting hole, and no limitation is made here.

[0056] The fixing ring 1400 is also made of glass fiber impregnated with epoxy resin. It is formed by stacking multiple layers of glass fiber cloth impregnated with epoxy resin to a certain thickness, and then molded and cured to form an annular glass fiber reinforced plastic plate. The fixing ring 1400 can also be a glass fiber reinforced polyimide composite material plate. The material is easy to obtain and easy to process. The fixing ring 1400 made of fiber reinforced composite material has good mechanical strength, can stably support the winding of the wire, and is not easy to damage, so as to avoid the high temperature vulcanized silicone rubber from generating a large injection impact force when it is injected outside the winding body 1310, which will disperse and displace the wire. The fiber reinforced composite material has good heat resistance, which can avoid the deformation of the fixing ring 1400 caused by overheating during the operation of the dry-type transformer 10. In this embodiment, the fixing ring 1400 is molded and cured. In other embodiments, the auxiliary parts can also be directly molded by integral casting and curing to simplify the process. The material of the fixing ring is consistent with the above, and will not be repeated.

[0057] See also Figure 12-14 The present application also discloses a mold assembly 200 for manufacturing a high-voltage winding 130, that is, during the molding process of the high-voltage winding 130, it is necessary to first install the winding body 1310 on the mold assembly 200, and perform wire winding on the winding body 1310 to form a high-voltage coil 1320 and install the airway component 240, and then use the winding body 1310 and the high-voltage coil 1320 together with the mold assembly 200 as the body to be injected, put the body to be injected into the mold of the injection machine, add silicone rubber raw materials, and inject high-temperature vulcanized silicone rubber as a whole on the periphery of the body to be injected to form a high-voltage insulation layer 1330, and after demolding and pulling out the airway component 240, the pancake-shaped high-voltage winding 130 including the airway can be obtained.

[0058] The mold assembly 200 includes a core mold 210, two core shafts 220, a plurality of fixed plates 230 and a plurality of airway parts 240. The core mold 210 is a hollow cylindrical body made of metal steel. The hollow core mold 210 is light in weight and easy to install; the material consumption is small and the production cost is low. The outer contour of the core mold 210 matches the inner contour of the fixed ring 1400, that is, the cross-section of the core mold 210 can correspond to a circle, an ellipse, or other shapes, so that the winding body 1310 can be firmly sleeved on the outer periphery of the core mold 210. In other embodiments, the core mold can also be a solid cylindrical body with high strength and good integrity. When the high-voltage coil 1320 is wound and during the injection molding process of the high-voltage insulation layer 1330, the winding body 1310 is located on the outer peripheral surface of the core mold 210, and the axial length of the winding body 1310 along the core mold 210 is less than or equal to the axial length of the core mold 210 along its axial direction.

[0059] The two mandrels 220 are fixedly connected to the center of the two end surfaces of the mandrel 210 along the axial direction of the mandrel 210. The mandrel 220 is a rod-shaped structure with a rectangular cross section, which is used to install the fixing plate 230 and fix the mold assembly 200 in the mold of the injection molding machine during the high-temperature vulcanized silicone rubber injection molding process. The mandrel 220 and the mandrel 210 can be fixed by welding. The mandrel 220 and the mandrel 210 are made of the same material, both of which are metal steel. In other embodiments, the cross section of the mandrel can also be circular or other shapes, and the mandrel can also be made of other metal materials, as long as it can achieve its function of installing the fixing plate and fixing the mold assembly.

[0060] Several fixing plates 230 are connected to one of the core shafts 220 at intervals. The fixing plates 230 are elliptical plate structures. The shape of the fixing plates 230 is the same as the outer peripheral shape of the first fixing ring 1410 and the size is equal. The fixing plates 230 are provided with a through hole 231 and several third mounting holes 232. The through hole 231 is set at the center of the fixing plate 230 for passing the core shaft 220. The shape of the through hole 231 corresponds to the core shaft 220, so that the core shaft 220 can be passed through and fixed in the through hole 231, preventing the fixing plate 230 from twisting and sliding on the core shaft 220, which causes the airway component 240 to be unable to be stably installed, affecting the airway quality of the high-voltage winding 130. The number and position of the third mounting holes 232 are set corresponding to the first mounting hole 1413 and the second mounting hole 1422, and each mounting hole cooperates with each other for passing the airway component 240. In this embodiment, two fixing plates 230 are provided. Compared with only one fixing plate 230, two fixing plates 230 can better limit the airway member 240, preventing the airway member 240 from shaking due to instability and being unable to penetrate into the second mounting hole 1422, resulting in the airway being unable to be formed; and it can prevent the airway member 240 from being obliquely penetrated in each mounting hole, so that the airway finally formed in the high-voltage winding 130 is skewed and cannot penetrate the high-voltage insulation layer 1330 along the axial direction of the high-voltage winding 130, and cannot achieve the purpose of heat dissipation. In other embodiments, the fixing plates can also be provided as one, three or more, as long as the airway member can be stably installed, and there is no limitation here.

[0061] In one embodiment, the airway member 240 is a rod-shaped structure with a capsule-shaped cross section, and the cross-sectional shape of the airway member 240 corresponds to the shape and size of the first mounting hole 1413, the second mounting hole 1422, and the third mounting hole 232, that is, the first mounting hole 1413, the second mounting hole 1422, and the third mounting hole 232 are capsule-shaped, which is convenient for the stable installation of the airway member 240. In another embodiment, the airway member 240 is a rod-shaped structure with a rounded trapezoidal cross section, and the cross-sectional shape of the airway member 240 corresponds to the shape of the second mounting hole 1422 and the third mounting hole 232, that is, at this time, the first mounting hole 1413, the second mounting hole 1422, and the third mounting hole 232 are rounded trapezoidal holes, which is convenient for the stable installation of the airway member 240. One end of the airway member 240 has a taper, that is, the outer diameter of one end of the airway member 240 gradually decreases along its axial direction toward the direction away from the airway member 240, which is convenient for the airway member 240 to be inserted into each mounting hole.

[0062] Combination Figure 5 , Figure 6 and Figure 8Taking the A-phase transformer 100 as an example, the wire is circumferentially wound on the outer peripheral surface of the winding body 1310 to form a high-voltage coil 1320. Specifically, the wire is wound in the winding groove 1312 of the winding plate 1311, so that the high-voltage coil 1320 is spaced apart in the axial direction of the high-voltage winding 130, and two external connections are formed at the head and tail ends of the wire after winding, namely a first external connection D and a second external connection X. The first external connection D is used to connect cables and other external connections, and the second external connection X is used to connect other external connections, such as in a three-phase transformer, for interconnection with each phase transformer. In addition, the wire leads out six taps in the middle part 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 switch. For the convenience 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. The first tap switch is arranged in parallel with the second tap switch. The six taps form a tap device of the high-voltage coil 1320, which is used for the dry-type transformer 10 to adjust the voltage according to different operating conditions.

[0063] The high-voltage insulation layer 1330 wraps the high-voltage coil 1320 and the winding body 1310 to form the high-voltage winding 130. Among them, the high-voltage insulation layer 1330 is a high-temperature vulcanized silicone rubber. Compared with the existing room temperature vulcanization process, the use of high-temperature vulcanized silicone rubber can make the high-voltage insulation layer 1330 more stable, with higher mechanical properties, and better adhesion to the high-voltage coil 1320 and the winding body 1310, which can effectively extend the service life of the high-voltage insulation layer 1330. In addition, compared with liquid silicone rubber, the silicone rubber filler of the present application is evenly dispersed, and local discharge will not occur due to filler agglomeration, and the product performance is better.

[0064] Combination Figure 6-Figure 14 When the high-voltage coil 1320 is wound by the pancake winding method, first, assemble the winding body 1310. The first fixing ring 1410 and the second fixing ring 1420 are clamped on the winding plate 1311 to form the winding body 1310. Specifically, the third clamping grooves 1412 of the two first fixing rings 1410 are respectively clamped in the first clamping grooves 1313 at both ends of the winding plate 1311, and the comb teeth at the ends of the winding plate 1311 are accommodated in the grooves 1411, so that the two first fixing rings 1410 are respectively clamped and connected with the two ends of the winding plate 1311; the fourth clamping groove 1421 is clamped in the fifth clamping groove 1315, so that the second fixing ring 1420 is clamped and connected with the middle part of the winding plate 1311.

[0065] Next, assemble the mold assembly 200. The winding body 1310 is sleeved on the mold assembly 200, and at least two fixing plates 230 are fixed on the core shaft 220 on one side of the mold assembly 200, that is, each fixing plate 230 is fixed to the outer periphery of the core shaft 220 at intervals through the through holes 231. Furthermore, before this step, a release agent can be applied to the outer peripheral surface of the core mold 210 to facilitate subsequent demolding after the high-voltage winding 130 is formed.

[0066] Then, the high voltage coil 1320 is wound. During the winding process of each coil, after the wire is wound to a first preset number of turns, the air channel member 240 is inserted to a preset position along the axial direction of the winding body 1310, and then the wire is wound to a second preset number of turns.

[0067] In one application scenario, combined with Figure 5 , Figure 6 and Figure 8 As shown, the conductor includes a first conductor and a second conductor, both of which are continuous conductors, and the first conductor and the second conductor are both coated with an insulating layer, which can be a polyimide film, a polyester film, a glass fiber film, or the insulating layer can be other insulating materials such as insulating paint, or a combination of multiple insulating materials can be used, which is not limited here. For the convenience of description, the end of the winding body 1310 close to the fixed plate 230 is defined as the first end, and the other end of the winding body 1310 is defined as the second end. The first conductor is wound from the first end of the winding body 1310 along the axial direction of the high-voltage winding 130 to the middle of the winding body 1310, and three taps are led out. The inner turn wire end of the first wire located at the first end of the winding body 1310 forms a first external connection D exposed outside the high-voltage insulating layer 1330, that is, the first external connection D is led out at the inner turn wire end of the first pancake coil (i.e., the head end of the first wire).

[0068] Specifically, the first wire is wound into a first pancake coil from the first end of the winding body 1310 to the second end of the winding body 1310, and the first wire is wound in the second clamping groove 1314 of the first circle winding groove 1412 at the first end of the winding body 1310 according to a first preset number of turns, wherein the first preset number of turns is M; after the winding is completed, a layer of insulating support material is coated on the outer layer of the first pancake coil that has been wound with M turns, and the insulating support material is glass fiber mesh cloth, electrical composite material or silicone cloth; the airway component 240 is inserted into the first preset position in the winding body 1310 from the first end of the winding body 1310 along the axial direction of the winding body 1310, that is, the tapered end of the airway component 240 is pierced with a third mounting hole 232 and a first mounting hole 1413 on the first fixing ring 1410 close to the fixing plate 230 in sequence, and along the M turns that have been wound The outer periphery of the first pancake coil moves toward the second end of the winding body 1310 until the airway piece 240 reaches the first preset position and stops moving, wherein the first preset position is the second comb tooth of the first end of the winding body 1310, so as to prevent the airway piece 240 from extending into the second winding groove 1312 at the first end of the winding body 1310 and affecting the winding of the second pancake coil; when all the airway pieces 240 are inserted into the first preset position, a layer of insulating support material is coated on the outer periphery of all the airway pieces 240, wherein the insulating support material does not coat the tail end of the first wire, so as to avoid affecting the continuous winding of the first wire; then the first wire is continued to be wound around the outer periphery of the layer of insulating support material according to the second preset number of turns N until the winding of the first pancake coil is completed, wherein the sum of the second preset number of turns N and the first preset number of turns M is the designed total number of turns of a pancake coil of the high-voltage coil 1320. Furthermore, before the airway member 240 is installed, a lubricating material may be applied to the outer periphery of the airway member 240 to form a lubricating layer, and the lubricating layer is made of a release agent, so that the airway member 240 can be smoothly pulled out after the high-voltage insulating layer 1330 is formed. In this embodiment, the insulating support material is set to two layers for sandwiching the airway member 240, and in other embodiments, it can also be set to three layers, four layers or more layers.

[0069] Then, the first wire continues to wind the second pancake coil toward the second end of the winding body 1310, that is, the outer turn wire end of the first pancake coil extends to the corresponding second circle winding groove 1312 on all winding plates 1311 and is wound according to the first preset number of turns M; after the winding is completed, a layer of insulating support material is coated on the outer layer of the second pancake coil that has been wound with M turns; the airway piece 240 is inserted into the second preset position in the winding body 1310 along the axial direction of the winding body 1310 until the airway piece 240 reaches the second preset position and stops moving, wherein the second preset position is the third comb tooth at the first end of the winding body 1310, so as to prevent the airway piece 240 from extending into the third winding groove 1312 at the first end of the winding body 1310 and affecting the winding of the third pancake coil; after all the airway pieces 240 are inserted into the second preset position, a layer of insulating support material is coated on the outer periphery of all the airway pieces 240; then the first wire is continued to be wound according to the second preset number of turns N on the periphery of the insulating support material to complete the winding of the second pancake coil.

[0070] Afterwards, the remaining pancake coils are wound in the same manner as the second pancake coil until the first conductor is wound to the middle of the winding body 1310, and three taps are respectively led out from the outer turn conductor ends of the three pancake coils adjacent to the side of the second fixing ring 1420 facing the first end of the winding body 1310, that is, Figure 5 The tap 6, tap 4 and tap 2 shown form a first tap changer, and the winding of the first conductor is now completed.

[0071] Then, each airway member 240 is inserted into the second mounting hole 1422 until one end of the airway member 240 is flush with the plate surface of the second fixing ring 1420 facing the second end of the winding body 1310 and stops moving, and the second wire is wound from the middle of the winding body 1310 to the second end of the winding body 1310. Specifically, the second wire starts to be wound in the winding groove 1312 adjacent to the side of the second fixing ring 1420 facing the second end of the winding body 1310, and three taps are respectively led out from the outer turn wire ends of the three-pancake coil adjacent to the side of the second fixing ring 1420 facing the second end of the winding body 1310, that is, Figure 5The tap 3, tap 5 and tap 7 shown form a second tap switch; then continue winding until the second wire is wound around the second clamping groove 1314 of the last winding groove 1412 at the second end of the winding body 1310 and forms a terminal coil. The specific winding method and the installation method of the airway component 240 are the same as those of the first wire. The outer turn wire end of the second wire located at the second end of the winding body 1310 forms a second external connection X exposed outside the high-voltage insulation layer 1330, that is, the second external connection X is led out at the outer turn wire end of the terminal coil (i.e., the end of the second wire). At this time, the airway component 240 penetrates the first mounting hole 1413 on the first fixing ring 1410 at the second end of the winding body 1310, and the second wire is wound. In other embodiments, the taps can be distributed at other positions in the middle of the high-voltage coil on the winding body according to the actual coil structure design requirements, which is not limited here.

[0072] When the wire is wound, it is wound in a circle of winding grooves 1312 corresponding to all winding plates 1311, so that each coil formed by the winding of the wire is perpendicular to the axis of the high-voltage winding 130, the winding is convenient and the wire is arranged neatly, the winding plate 1311 is evenly stressed, and the mechanical strength is good.

[0073] In this way, a pancake-shaped high-voltage coil 1320 is formed. The high-voltage coil structure has good mechanical strength and a strong ability to withstand the electromotive force generated by short-circuit current. Compared with the layer-type high-voltage coil, it has more pancakes.

[0074] The wire is wound on the winding body 1310 to form a high-voltage coil 1320, so that the high-voltage coil 1320 is ring-shaped, and the ring width of the high-voltage coil 1320 is defined as the width of the high-voltage coil 1320. The width of the high-voltage coil 1320 on each radial section is consistent, that is, the outer side surface of the high-voltage coil 1320 is equidistant from the outer peripheral surface of the high-voltage winding 130, so that the overall force of the high-voltage coil 1320 is balanced. Of course, considering the actual operation situation, the width of the high-voltage coil on its radial section may not be exactly the same, as long as it is roughly the same.

[0075] In this embodiment, the second wire is wound from the middle of the winding body 1310 to the second end thereof. In other embodiments, the second wire can also be wound upward from the second end of the winding body to the middle of the winding body 1310, except that the second external connection X is formed first, and then the tap 7, tap 5 and tap 3 are formed in sequence. Of course, the winding method of the high-voltage coil 1320 is not limited to the above method, and other methods can also be used to form a pancake-shaped high-voltage coil, as long as the high-voltage winding 130 can be finally formed.

[0076] In this embodiment, the tap switch includes six taps, and the dry-type transformer 10 has five gears for adjusting the voltage. In other embodiments, the tap switch may also include four taps, that is, the first tap switch and the second tap switch each include two taps, and the dry-type transformer has three gears for adjusting the voltage. As long as it meets the actual use requirements of the dry-type transformer, it is not limited here. At this point, the high-voltage coil is wound.

[0077] Afterwards, the winding body 1310 wound with the high-voltage coil 1320 is placed into the mold of the injection machine together with the mold assembly 200 as the body to be injected, and silicone rubber raw materials are added. High-temperature vulcanized silicone rubber is injected around the entire periphery of the body to be injected to form a high-voltage insulation layer to obtain a preform.

[0078] Among them, after the high-voltage coil 1320 and the winding body 1310 are covered by the overall vacuum injection of high-temperature vulcanized silicone rubber, 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 a hollow column as a whole, which can be a hollow cylinder, a hollow long cylinder, or other hollow columns. The high-voltage insulation 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.

[0079] Finally, the preform is separated from the mold assembly 200, and the airway piece 240 is pulled out to obtain a high-voltage winding 130 with an axial airway, specifically a high-voltage encapsulated pancake winding. Among them, the axial airway is arranged along the axial direction of the high-voltage winding 130 and penetrates the high-voltage insulation layer 1330, so that the high-voltage winding 130 can dissipate heat through its inner surface, outer surface and internal axial airway, and the heat dissipation efficiency is higher, so that the high-voltage winding 130 can be applied to large-capacity dry-type transformers 10 with higher heat dissipation requirements, and the application range is wider; and compared with the traditional heat dissipation method of reducing resistance loss by increasing the cross-sectional area of ​​the high-voltage coil wire, the amount of wire used is reduced, and the product cost is reduced. Since both sides of the airway piece 240 and the high-voltage coil 130 contacting the coil are coated with insulating support materials, when the airway piece 240 is pulled out to form the airway, the wire in the airway will not be exposed to the air, which is conducive to extending the service life of the high-voltage winding 130.

[0080] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A high voltage winding, characterized in that: The high-voltage winding includes a winding body, a high-voltage coil and a high-voltage insulation layer. The winding body includes a plurality of winding plates and a plurality of fixing rings. The winding plates are clamped and connected to the fixing rings. The fixing rings are provided with a plurality of first mounting holes and a plurality of second mounting holes. The first mounting holes and the second mounting holes are used to cooperate with the air duct parts. The wire is wound on the winding body to form the high-voltage coil. The high-voltage coil includes a plurality of pancake coils. The high-voltage insulation layer wraps the high-voltage coil and the winding body. The high-voltage winding also includes a plurality of air ducts. The air ducts are arranged along the axial direction of the high-voltage winding and penetrate the high-voltage insulation layer.

2. The high voltage winding according to claim 1, characterized in that: The winding plate is provided with a plurality of comb teeth, and the plurality of winding plates are evenly distributed along the circumference of the high-voltage winding, and at least one coil is arranged between two adjacent comb teeth on the winding plate.

3. The high voltage winding according to claim 1, characterized in that: The plurality of fixing rings include two first fixing rings, and the plurality of winding plates are correspondingly provided with two first slots. The two first fixing rings are clamped at both ends of the winding plates through the first slots, and a plurality of first mounting holes are provided between every two first slots.

4. The high voltage winding according to claim 1, characterized in that: Several of the fixing rings include at least one second fixing ring, and at least one fifth slot is correspondingly provided on several of the winding plates. The second fixing ring is clamped in the middle of the winding plate through the fifth slot, and several of the second mounting holes are provided between every two of the fifth slots.

5. The high voltage winding according to claim 1, characterized in that: The first mounting hole and the second mounting hole are identical in shape and number, and the first mounting hole and the second mounting hole are arranged correspondingly.

6. The high voltage winding according to claim 1, characterized in that: The cross section of the airway piece is capsule-shaped or rounded trapezoidal, and the shapes and sizes of the first mounting hole and the second mounting hole correspond to and match the cross section of the airway piece; the outer diameter of one end of the airway piece gradually decreases along the axial direction of the airway piece toward a direction away from the airway piece.

7. The high voltage winding according to claim 1, characterized in that: At least two layers of insulating support material are arranged in the high-voltage coil for sandwiching the airway component, and the insulating support material is glass fiber mesh cloth, electrical composite material or silicone cloth.

8. The high voltage winding according to claim 1, characterized in that: A lubricating layer is arranged on the outer periphery of the airway component, and the lubricating layer is made of a release agent.

9. A mold assembly for manufacturing a high voltage winding according to any one of claims 1 to 8, characterized in that: The mold assembly includes a core mold, two core shafts, a plurality of fixed plates and a plurality of airway components. The two core shafts are fixedly connected to the two ends of the core mold along the axial direction of the core mold; a plurality of fixed plates are connected to one of the core shafts, and a through hole and a plurality of third mounting holes are provided on the fixed plate. The through hole is used to pass the core shaft, and the third mounting hole is used to cooperate with the winding body to pass the airway components.

10. A method for manufacturing a high voltage winding, used for manufacturing the high voltage winding according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step ①: Assemble the mold assembly and the winding body, and sleeve the winding body on the mold assembly; Step ②: Winding the wire on the winding body to form a high-voltage coil, wherein, during the winding process of each coil, after the wire is wound to a first preset number of turns, the airway member is inserted along the axial direction of the winding body to a preset position, and then the wire is wound to a second preset number of turns; Step ③: Place the winding body wound with the high-voltage coil as the body to be injected into the injection machine, inject high-temperature vulcanized silicone rubber as a whole around the body to be injected to form a high-voltage insulation layer, pull out the airway component, and obtain the high-voltage winding with an axial airway.

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