Transformer coil, high-voltage coil with transformer coil and winding method

Abstract

According to the transformer coil, the high-voltage coil with the transformer coil and the winding method, the transformer coil is of a cylindrical structure, each layer of the transformer coil is bent into a spiral body through the same conductive strip, and each spiral unit in the axial direction of the spiral body is formed by bending the conductive strip by a circle in the circumferential direction; two adjacent spiral units in the axial direction are recorded as a first spiral unit and a second spiral unit; the conductive strip is formed by arranging a bare wire and an insulating tape side by side, the width of the insulating tape is larger than that of the bare wire, the insulating tape is provided with a middle part, a first side part and a second side part in the width direction, and the first side part, corresponding to the first spiral unit, of the insulating tape is located on the outer side of the corresponding bare wire. The middle part of the insulating tape corresponding to the first spiral unit is located between the bare conductors corresponding to the first and second spiral units, and the second side part of the insulating tape corresponding to the first spiral unit is located on the inner side of the bare conductors corresponding to the second spiral unit. According to the invention, the interlayer insulation thickness can be ensured, the turn-to-turn insulation thickness is reduced, and the cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of transformers, and in particular relates to a transformer coil, a high-voltage coil having the transformer coil, and a winding method of the transformer coil. Background Art

[0002] A coil usually refers to a ring-shaped wire winding and can be used in transformers, motors, etc. The number of times the wire is wrapped around an object is called the number of turns of the coil.

[0003] The cylindrical coil in the transformer is Figure 1 , 2 The winding sequence is as shown in Figure 1 As shown by the middle arrow, after the first layer on the inside is wound, it is necessary to place interlayer insulating material on the periphery of the first layer, and then make an S-bend to start winding the second layer. After the second layer is wound, the remaining layers are wound in sequence according to the method of placing interlayer insulating material, making an S-bend, and winding until the coil is completed.

[0004] And when winding the transformer coil in the prior art, Figure 1 , 2 As shown in the figure, all of them are insulated wires with outer insulation, such as enameled wire, paper-covered wire, glass-fiber-covered wire or their mixed insulated wires. Regardless of the type of insulated wire, it needs to be processed on proprietary equipment in advance, which increases time and cost. At the same time, considering the interlayer insulation strength, the outer insulation of the existing insulated wires generally has a certain thickness, resulting in a large insulation thickness between turns, such as Figure 1 The thickness of the outer insulation of the insulated flat wire with a square cross section is 0.2mm, the thickness of the interlayer insulation is 0.8mm, and the thickness of the interturn insulation is 0.4mm. Figure 2 The thickness of the outer insulation of the insulated round wire with a circular cross section is 0.06mm, the thickness of the interlayer insulation is 0.52mm, and the thickness of the interturn insulation is 0.12mm. However, in actual applications, the interturn voltage is not high, which results in a waste of interturn insulation and an increase in cost. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a transformer coil in view of the current status of the prior art, so as to ensure the insulation thickness between layers while reducing the insulation thickness between turns and reducing the cost.

[0006] The second technical problem to be solved by the present invention is to provide a high-voltage coil having the above-mentioned transformer coil.

[0007] The third technical problem to be solved by the present invention is to provide a winding method for the transformer coil to improve the winding efficiency.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a transformer coil is a cylindrical structure, and each layer in the inner and outer directions of the cylindrical structure is formed by bending the same conductive strip into an axially extending spiral body, and each spiral unit in the axial direction of the spiral body is formed by bending the conductive strip in a circle along the circumferential direction, and two adjacent spiral units in the axial direction according to the bending order are recorded as the first spiral unit and the second spiral unit;

[0009] The characteristic is that: the conductive strip is composed of a bare wire and an insulating tape attached to the bare wire along the length direction, and the width dimension of the insulating tape is greater than the width dimension of the bare wire. The insulating tape has a middle part and a first side part and a second side part respectively located on both sides of the middle part in the width direction. The first side part of the insulating tape corresponding to the first spiral unit is located on the outside of the bare wire corresponding to the first spiral unit, the middle part of the insulating tape corresponding to the first spiral unit is located between the bare wires corresponding to the first spiral unit and the second spiral unit, so that the bare wires of the two adjacent spiral units are separated by the insulating tape, and the second side part of the insulating tape corresponding to the first spiral unit is located on the inner side of the bare wire corresponding to the second spiral unit.

[0010] The present invention adopts a combination of bare wire (without outer insulation) and insulating tape as the conductive strip, which can reduce the processing cost of the conductive strip. In addition, the positional relationship between the insulating tape and the bare wire in the coil of the present invention allows the bare wires of two adjacent spiral units to be separated by the insulating tape, that is, the thickness of the insulating tape is the inter-turn insulation thickness between the bare wires of two adjacent spiral units in the axial direction, thereby reducing the insulation distance between the turns. At the same time, the first and second side parts of the insulating tape can be used as interlayer insulation to ensure the interlayer insulation distance.

[0011] In the present invention, interlayer insulating materials can be placed between adjacent inner and outer layers as required to further increase the interlayer insulating distance. Of course, if the first and second side portions of the insulating tape meet the requirements as interlayer insulation, interlayer insulating materials may not be placed separately.

[0012] Preferably, the bare wire is a flat wire with a rectangular cross section or a round wire with a circular cross section;

[0013] When the bare wire is a flat wire, the width dimension A of the insulating tape, the width dimension B of the flat wire, and the thickness dimension C of the flat wire satisfy the following: A>1.1×B+C;

[0014] When the bare wire is a round wire, the width dimension A of the insulating tape and the circumference D of the round wire satisfy: 0.5D<A<D.

[0015] Furthermore, the first side portion of the insulating tape corresponding to the first spiral unit completely shields the outside of the bare wire; and the second side portion of the insulating tape corresponding to the first spiral unit can shield at least a portion of the bare wire.

[0016] Preferably, the insulating tape is composed of one insulating tape body or at least two insulating tape bodies, and when there is one insulating tape body, the insulating tape body is one of insulating film, insulating paper, and insulating cloth; when there are at least two insulating tape bodies, the insulating tape body is at least one of insulating film, insulating paper, and insulating cloth, and the insulating tape bodies are stacked side by side to form the insulating tape.

[0017] In the above schemes, preferably, the thickness of the insulating tape is the inter-turn insulation thickness between the bare wires of two adjacent spiral units in the axial direction, and the thickness of the insulating tape is ≤0.1 mm.

[0018] Furthermore, an interlayer insulating material is selectively provided between two adjacent layers of inner and outer spiral bodies, so that the interlayer insulating thickness of the first and second side portions having the insulating belt is ≥ 0.15 mm.

[0019] The technical solution adopted by the present invention to solve the above second technical problem is: a high-voltage coil, including at least two cylindrical coils arranged along the axial direction, the outgoing wire of the outer layer of the first cylindrical coil of the two adjacent cylindrical coils is the incoming wire of the inner layer of the second cylindrical coil; characterized in that: the cylindrical coil adopts the transformer coil as described above, and there is a radially extending radial airway or oil channel between the two adjacent cylindrical coils to connect the inner and outer spaces of the cylindrical coils. The radial airway is conducive to the circulation of air inside and outside the coil, thereby improving the heat dissipation performance of the coil.

[0020] Preferably, the high voltage coil is used in a dry-type transformer.

[0021] The technical solution adopted by the present invention to solve the third technical problem is: a method for winding a transformer coil as described above, characterized in that:

[0022] When an interlayer insulating material is provided between two adjacent layers of spiral bodies, the steps are as follows:

[0023] 1. Attach the first side portion of the insulating tape to the outside of the bare wire, arrange the middle portion and the second side portion of the insulating tape on the spiral rising side, align one end of the bare wire with one end of the insulating tape to form a winding start, and fix the winding start;

[0024] 2. The bare wire and the insulating tape are bent together in the circumferential direction with the bare wire on the inside and the insulating tape on the outside to form a first spiral unit, and then bent again in the circumferential direction to form a second spiral unit, the bare wire corresponding to the second spiral unit is wound on the second side portion of the insulating tape corresponding to the first spiral unit, and the middle portion of the insulating tape corresponding to the first spiral unit is located between the bare wires of the first and second spiral units, and the winding is continued in the above manner until the Nth spiral unit and the N+1th spiral unit are completed to complete the winding of the first layer of spiral body, and the first spiral unit, the second spiral unit...the Nth spiral unit, the N+1th spiral unit in the first layer of spiral body are arranged in sequence along the first axial direction; wherein N is a natural number ≥ 2;

[0025] 3. After the winding of the first layer of spiral body is completed, interlayer insulation material is placed on the periphery of the first layer of spiral body, and the insulation tape rises to the second layer along the bare wire with S-bends, and is bent in sequence along the second axial direction opposite to the first axial direction into the first spiral unit, the second spiral unit...the Nth spiral unit, the N+1th spiral unit, until the winding of the second layer of spiral body is completed;

[0026] 4. After the second layer of spiral body is wound, interlayer insulation material is placed on the periphery of the second layer of spiral body, and the insulation tape rises to the third layer along with the bare wire with S-bends, and is bent into the first spiral unit, the second spiral unit...the Nth spiral unit, the N+1th spiral unit in sequence along the first axial direction until the winding of the third layer of spiral body is completed;

[0027] 5. After the third layer of spiral body is wound, the remaining layers of spiral body are wound according to the rules of steps 3 and 4 above until the winding of the entire transformer coil is completed;

[0028] When there is no interlayer insulating material between two adjacent layers of spiral bodies, the steps are as follows:

[0029] 1. Attach the first side portion of the insulating tape to the outside of the bare wire, arrange the middle portion and the second side portion of the insulating tape on the spiral rising side, and align one end of the bare wire with one end of the insulating tape to form a winding end, and fix the winding end.

[0030] 2. The bare wire and the insulating tape are bent together in the circumferential direction with the bare wire on the inside and the insulating tape on the outside to form a first spiral unit, and then bent again in the circumferential direction to form a second spiral unit, the bare wire corresponding to the second spiral unit is wound on the second side portion of the insulating tape corresponding to the first spiral unit, and the middle portion of the insulating tape corresponding to the first spiral unit is located between the bare wires of the first and second spiral units, and the winding is continued in the above manner until the Nth spiral unit and the N+1th spiral unit are completed to complete the winding of the first layer of spiral body, and the first spiral unit, the second spiral unit...the Nth spiral unit, the N+1th spiral unit in the first layer of spiral body are arranged in sequence along the first axial direction; wherein N is a natural number ≥ 2;

[0031] 3. After the winding of the first layer of spiral body is completed, the insulating tape is raised to the second layer along with the bare wire with S-bend, and then the insulating material is placed at the S-bend, and then it is bent in sequence along the second axial direction opposite to the first axial direction into the first spiral unit, the second spiral unit...the Nth spiral unit, the N+1th spiral unit, until the winding of the second layer of spiral body is completed;

[0032] 4. After the second layer of spiral body is wound, the insulating tape is raised to the third layer along with the bare wire with S-bend, and then the insulating material is placed at the S-bend, and then the wire is bent in sequence along the first axial direction into a first spiral unit, a second spiral unit (102), ... an Nth spiral unit, and an N+1th spiral unit, until the winding of the third layer of spiral body is completed;

[0033] 5. After the third layer of spiral body is wound, the remaining layers of spiral body are wound according to the rules of steps 3 and 4 above until the winding of the entire transformer coil is completed.

[0034] The present invention directly uses bare wires and insulating tapes to wind coils together, thereby reducing the processing cost of the conductor; at the same time, when no interlayer insulating material is provided between two adjacent layers of spiral bodies, the winding method of the present invention can greatly improve production efficiency.

[0035] Compared with the prior art, the advantages of the present invention are: the present invention adopts a combination of bare wire and insulating tape as the conductive strip, which can reduce the processing cost of the conductive strip. In addition, the positional relationship between the insulating tape and the bare wire in the coil of the present invention allows the bare wires of two adjacent spiral units to be separated by the insulating tape, that is, the thickness of the insulating tape is the inter-turn insulation thickness between the bare wires of two adjacent spiral units in the axial direction, thereby reducing the insulation distance between the turns. At the same time, the first and second side parts of the insulating tape can be used as interlayer insulation to ensure the interlayer insulation distance.

[0036] In the winding process of the present invention, bare wires and insulating tapes are directly used to wind the coils together, thereby reducing the processing cost of the conductors. At the same time, when no interlayer insulating material is provided between two adjacent layers of spiral bodies, the winding method of the present invention can greatly improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a transformer coil in the prior art;

[0038] Figure 2 It is a structural schematic diagram of another transformer coil in the prior art;

[0039] Figure 3 It is a structural schematic diagram of a transformer coil according to the first embodiment of the present invention;

[0040] Figure 4 A partial structural cross-sectional view of a transformer coil according to a first embodiment of the present invention;

[0041] Figure 5 A longitudinal cross-sectional view of a dry-type transformer according to Embodiment 1 of the present invention;

[0042] Figure 6 A top view of a dry-type transformer according to Embodiment 1 of the present invention;

[0043] Figure 7 It is a front view of a dry-type transformer according to the first embodiment of the present invention;

[0044] Figure 8 A top view of one of the airway plates in the first embodiment of the present invention;

[0045] Fig. 9 for Figure 8 Front view of the middle airway plate;

[0046] Fig.10 A top view of another airway plate according to the first embodiment of the present invention;

[0047] Fig.11 for Fig.10 Front view of the middle airway plate;

[0048] Fig.12 It is a structural schematic diagram of a transformer coil according to a second embodiment of the present invention;

[0049] Fig.13 It is a partial structural cross-sectional view of a transformer coil according to the second embodiment of the present invention;

[0050] Fig.14 It is a structural schematic diagram of a transformer coil according to a third embodiment of the present invention;

[0051] Fig.15It is a partial structural cross-sectional view of a transformer coil according to the third embodiment of the present invention;

[0052] Fig.16 Schematic diagram of the structure of the transformer coil according to the fourth embodiment of the present invention;

[0053] Fig.17 It is a partial structural cross-sectional view of a transformer coil according to the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0054] The present invention is further described in detail below with reference to the accompanying drawings.

[0055] Embodiment 1:

[0056] like Figures 3 to 11 As shown in FIG. 1 , a transformer coil, a high voltage coil having the transformer coil and a preferred embodiment of a winding method of the present invention are shown. The transformer coil is a cylindrical structure, and each layer in the inner and outer directions of the cylindrical structure is bent into an axial direction (i.e., Figure 1 The invention relates to a spiral body 100 extending in the vertical direction (in the vertical direction), each spiral unit in the axial direction of the spiral body 100 is formed by bending the conductive strip 10 in a circle along the circumferential direction, and the two adjacent spiral units in the axial direction according to the bending order are recorded as the first spiral unit 101 and the second spiral unit 102. The conductive strip 10 is arranged by a bare wire 11 and an insulating tape 12 attached to the bare wire 11 along the length direction, and the bare wire 11 is a flat wire with a rectangular cross section, the width of the insulating tape 12 is greater than the width of the bare wire 11, and the insulating tape 12 has a middle part 120 and a first side part 121 and a second side part 122 respectively located on both sides of the middle part 120 in the width direction, and the first side part 121 of the insulating tape 12 corresponding to the first spiral unit 101 is located on the outside of the bare wire 11 corresponding to the first spiral unit 101 and completely covers the bare wire. 11, the middle part 120 of the insulating tape 12 corresponding to the first spiral unit 101 is located between the bare wires 11 corresponding to the first spiral unit 101 and the second spiral unit 102, so that the bare wires 11 of two adjacent spiral units in the axial direction are separated by the insulating tape 12, the thickness of the insulating tape 12 is the inter-turn insulation thickness between the bare wires 11 of two adjacent spiral units in the axial direction, and the second side part 122 of the insulating tape 12 corresponding to the first spiral unit 101 is located on the inner side of the bare wire 11 corresponding to the second spiral unit 102 and covers part of the bare wire 11. Thus, the first side part 121 of the insulating tape 12 located in the inner layer and the corresponding second side part 122 of the insulating tape 12 of the adjacent layer located outside the inner layer jointly form interlayer insulation.

[0057] In this embodiment, the width dimension A of the insulating tape 12, the width dimension B of the flat wire, and the thickness dimension C of the flat wire satisfy: A>1.1×B+C. The thickness of the insulating tape 12 is 0.05 mm (i.e., the inter-turn insulation thickness is 0.05 mm). The insulating tape 12 is composed of an insulating tape body, which is one of an insulating film, insulating paper, and insulating cloth.

[0058] Meanwhile, in this embodiment, an interlayer insulating material 2 is provided between the inner and outer adjacent layers of spiral bodies 100, and the thickness of the interlayer insulating material 2 is 0.4 mm, so that the interlayer insulating thickness of the first and second side portions of the insulating tape 12 is 0.5 mm. For details, please refer to Figure 3 .

[0059] The winding steps of the transformer coil of this embodiment are as follows:

[0060] 1. Attach the first side portion 121 of the insulating tape 12 to the outside of the bare wire 11, arrange the middle portion 120 and the second side portion 122 of the insulating tape 12 on the spiral rising side, and align one end of the bare wire 11 with one end of the insulating tape 12 to form a winding start end, and fix the winding start end;

[0061] 2. The bare wire 11 and the insulating tape 12 are bent together in a circumferential direction with the bare wire 11 on the inside and the insulating tape 12 on the outside to form a first spiral unit 101, and then bent downward and circumferentially to form a second spiral unit 102. The bare wire 11 corresponding to the second spiral unit 102 is wound on the second side portion 122 of the insulating tape 12 corresponding to the first spiral unit 101, and the middle portion 120 of the insulating tape 12 corresponding to the first spiral unit 101 is located between the bare wires 11 of the first and second spiral units. The winding is continued in the above manner until the Nth spiral unit and the N+1th spiral unit are completed to complete the winding of the first layer of the spiral body. In the first layer of the spiral body, the first spiral unit 101, the second spiral unit 102,...the Nth spiral unit, and the N+1th spiral unit are arranged in sequence from top to bottom; wherein N is a natural number ≥ 2;

[0062] 3. After the winding of the first layer of spiral body is completed, an interlayer insulating material 2 is placed on the periphery of the first layer of spiral body, and the insulating tape 12 is raised to the second layer along with the bare wire 11 with S-bends, and then is bent from bottom to top in sequence into a first spiral unit 101, a second spiral unit 102, ... an Nth spiral unit, an N+1th spiral unit, until the winding of the second layer of spiral body is completed;

[0063] Fourth, after the second layer of spiral body is wound, an interlayer insulating material 2 is placed on the periphery of the second layer of spiral body, and the insulating tape 12 is raised to the third layer along with the S-bent bare wire 11, and then bent from top to bottom in sequence into a first spiral unit 101, a second spiral unit 102, ..., an Nth spiral unit, and an N+1th spiral unit, until the winding of the third layer of spiral body is completed;

[0064] 5. After the third layer of spiral body is wound, the remaining layers of spiral body are wound according to the rules of steps 3 and 4 above until the winding of the entire transformer coil is completed.

[0065] like Figure 5 As shown, the high voltage coil of this embodiment includes four axially (i.e. Figure 5 The cylindrical coils 1 (i.e., the transformer coils mentioned above) are arranged in the vertical direction (in the vertical direction), and there is a radial air passage 111 extending radially between two adjacent cylindrical coils 1 to connect the inner and outer spaces of the cylindrical coils, and there are multiple radial air passages 111 between two adjacent cylindrical coils 1, which are arranged at intervals along the circumference of the coils. In this embodiment, the four cylindrical coils 1 are divided into two groups in pairs, namely, the first group of coils 1a of the two cylindrical coils 1 located on the upper side and the second group of coils 1b of the two cylindrical coils 1 located on the lower side. The outgoing wire of the first cylindrical coil of the two adjacent cylindrical coils 1 in each group is the incoming wire of the second cylindrical coil, and the first cylindrical coil, the second cylindrical coil and the incoming and outgoing wires between the two are arranged in a Z shape. At the same time, the radial air passage 111 between the first group of coils 1a and the second group of coils 1b is recorded as the first radial air passage 111a, and the radial air passage 111 between the two adjacent cylindrical coils 1 in each group is recorded as the second radial air passage 111b. The height dimension H1 of the first radial air passage 111a in the vertical direction is greater than the height dimension H2 of the second radial air passage 111b, and the first radial air passage 111a is located at the center of the high voltage coil.

[0066] like Figure 5 As shown, the dry-type transformer of this embodiment includes an iron core 6, a low-voltage winding 3 wound around the outer periphery of the iron core 6, a high-voltage winding 4 wound around the outer periphery of the low-voltage winding 3, and an insulating cylinder 5 arranged between the low-voltage winding 3 and the high-voltage winding 4. The high-voltage winding 4 adopts the above-mentioned high-voltage coil. The insulating cylinder 5 includes two connected upper and lower sections of insulating cylinders 50, the inner diameter of the upper insulating cylinder is larger than the inner diameter of the lower insulating cylinder, the lower end of the upper insulating cylinder is sleeved on the outer periphery of the upper end of the lower insulating cylinder, and an annular gap 51 is formed between the two, the annular gap 51 is arranged corresponding to the first radial airway 111a, and the height dimension H3 of the annular gap 51 in the axial direction is not less than 20mm. At the same time, in this embodiment, the two sections of insulating cylinders 50 and the low-voltage winding are bonded by struts.

[0067] The steps of winding the high voltage winding in this embodiment are as follows:

[0068] 1. Wind the first coil 1a and the second coil 1b in sequence, and place them vertically in the mold one above the other. A second airway plate is placed between two adjacent cylindrical coils 1 in the first coil 1a and the second coil 1b, and a first airway plate is placed between the first coil 1a and the second coil 1b. The shapes of the first and second airway plates are designed according to the shapes of the cross sections of the high-voltage windings, as shown in FIG. Figure 8 , 10 The shape shown;

[0069] 2. Place the mold with the first group of coils 1a and the second group of coils 1b at an ambient temperature of 100-120°C for 8-12 hours, then evacuate the coils, pour epoxy resin, and cure after pouring. After curing, remove the mold and the first and second airway plates to obtain a high-voltage winding with radial airways 111. The evacuation, pouring epoxy resin and curing processes are prior art and will not be described in detail.

[0070] 3. The high-voltage winding with radial air passage 111 prepared in step 2 is placed in a vacuum tank filled with semiconductor liquid insulating material and soaked for 2 to 5 times, and then removed and solidified. In this way, there is a semiconductor layer on the surface of the high-voltage winding, making the electric field on the surface of the coil uniform, and preventing the coil insulation from being damaged due to the high local electric field.

[0071] Specifically, the method for winding a single set of coils in step 1 is:

[0072] After the last layer of the first cylindrical coil is wound, the wire is bent so that the outgoing wire of the first cylindrical coil is the incoming wire of the second cylindrical coil, and then the first layer, the second layer, and the last layer of the second cylindrical coil are wound on the mold in sequence.

[0073] And in this embodiment, if Figure 7 As shown, six taps are led out from the middle part of the high-voltage winding in the axial direction, namely tap 2, tap 3, tap 4, tap 5, tap 6, and tap 7. The tap leading method is the existing technology and will not be described in detail.

[0074] Of course, in the present invention, the number of cylindrical coils 1 in the high-voltage winding can also be an odd number greater than 2, and the cylindrical coil 1 in the middle section in the axial direction is a tapping section for leading out the tap, and an insulating layer is provided between the inner and outer adjacent layers of the tap lead-out area on the tapping section.

[0075] Embodiment 2:

[0076] like Fig.12 , 13As shown, a preferred embodiment 2 of a transformer coil, a high-voltage coil having the transformer coil, and a winding method of the present invention is shown. This embodiment is basically the same as the embodiment 1, except that in this embodiment, the bare wire 11 is a round wire with a circular cross section, and the width dimension A of the insulating tape 12 and the circumference D of the round wire satisfy: 0.5D<A<D. And the second side portion 122 of the insulating tape 12 corresponding to the first spiral unit 101 is located on the inner side of the bare wire 11 corresponding to the second spiral unit 102 and completely covers the bare wire 11.

[0077] Embodiment three:

[0078] like Fig.14 , 15 As shown, the preferred embodiment 3 of a transformer coil, a high-voltage coil having the transformer coil and a winding method of the present invention is shown. This embodiment is basically the same as the embodiment 1, except that no interlayer insulating material is provided between the inner and outer adjacent layers of spiral bodies 100 in this embodiment, and the thickness of the insulating tape 12 is 0.1 mm (i.e., the inter-turn insulation thickness is 0.1 mm, and the inter-layer insulation thickness is 0.2 mm). The insulating tape 12 is composed of two insulating tape bodies, and the insulating tape body is at least one of an insulating film, insulating paper, and insulating cloth.

[0079] The winding steps of the transformer coil of this embodiment are as follows:

[0080] 1. Attach the first side portion 121 of the insulating tape 12 to the outside of the bare wire 11, arrange the middle portion 120 and the second side portion 122 of the insulating tape 12 on the spirally raised side, and align one end of the bare wire 11 with one end of the insulating tape 12 to form a winding end, and fix the winding end.

[0081] 2. The bare wire 11 and the insulating tape 12 are bent together in a circumferential direction with the bare wire 11 on the inside and the insulating tape 12 on the outside to form a first spiral unit 101, and then bent downward and circumferentially to form a second spiral unit 102. The bare wire 11 corresponding to the second spiral unit 102 is wound on the second side portion 122 of the insulating tape 12 corresponding to the first spiral unit 101, and the middle portion 120 of the insulating tape 12 corresponding to the first spiral unit 101 is located between the bare wires 11 of the first and second spiral units. The winding is continued in the above manner until the Nth spiral unit and the N+1th spiral unit are completed to complete the winding of the first layer of the spiral body. In the first layer of the spiral body, the first spiral unit 101, the second spiral unit 102,...the Nth spiral unit, and the N+1th spiral unit are arranged in sequence from top to bottom; wherein N is a natural number ≥ 2;

[0082] 3. After the winding of the first layer of the spiral is completed, the insulating tape 12 is raised to the second layer along with the bare wire 11 with an S-bend, and then an insulating material is placed at the S-bend, and then the wire is bent from bottom to top in sequence into a first spiral unit 101, a second spiral unit 102, ... an Nth spiral unit, an N+1th spiral unit, until the winding of the second layer of the spiral is completed;

[0083] 4. After the second layer of spiral body is wound, the insulating tape 12 is raised to the third layer along with the bare wire 11 with S-bend, and then the insulating material is placed at the S-bend, and then the wire is bent from top to bottom in sequence into the first spiral unit 101, the second spiral unit 102, ... the Nth spiral unit, the N+1th spiral unit, until the winding of the third layer of spiral body is completed;

[0084] 5. After the third layer of spiral body is wound, the remaining layers of spiral body are wound according to the rules of steps 3 and 4 above until the winding of the entire transformer coil is completed.

[0085] Embodiment 4:

[0086] like Fig.16 , 17 As shown, the fourth preferred embodiment of a transformer coil, a high-voltage coil having the transformer coil, and a winding method of the present invention is basically the same as the second embodiment, except that no interlayer insulation material is provided between the inner and outer adjacent layers of spiral bodies 100 in this embodiment, and the thickness of the insulating tape 12 is 0.1 mm (i.e., the inter-turn insulation thickness is 0.1 mm, and the inter-layer insulation thickness is 0.2 mm). The insulating tape 12 is composed of two insulating tape bodies, and the insulating tape body is at least one of an insulating film, insulating paper, and insulating cloth.

[0087] The winding steps of the transformer coil of this embodiment are as follows:

[0088] 1. Attach the first side portion 121 of the insulating tape 12 to the outside of the bare wire 11, arrange the middle portion 120 and the second side portion 122 of the insulating tape 12 on the spiral rising side, and align one end of the bare wire 11 with one end of the insulating tape 12 to form a winding start end, and fix the winding start end.

[0089] 2. The bare wire 11 and the insulating tape 12 are bent together in a circumferential direction with the bare wire 11 on the inside and the insulating tape 12 on the outside to form a first spiral unit 101, and then bent downward and circumferentially to form a second spiral unit 102. The bare wire 11 corresponding to the second spiral unit 102 is wound on the second side portion 122 of the insulating tape 12 corresponding to the first spiral unit 101, and the middle portion 120 of the insulating tape 12 corresponding to the first spiral unit 101 is located between the bare wires 11 of the first and second spiral units. The winding is continued in the above manner until the Nth spiral unit and the N+1th spiral unit are completed to complete the winding of the first layer of the spiral body. In the first layer of the spiral body, the first spiral unit 101, the second spiral unit 102,...the Nth spiral unit, and the N+1th spiral unit are arranged in sequence from top to bottom; wherein N is a natural number ≥ 2;

[0090] 3. After the winding of the first layer of the spiral is completed, the insulating tape 12 is raised to the second layer along with the bare wire 11 with an S-bend, and then an insulating material is placed at the S-bend, and then the wire is bent from bottom to top in sequence into a first spiral unit 101, a second spiral unit 102, ... an Nth spiral unit, an N+1th spiral unit, until the winding of the second layer of the spiral is completed;

[0091] 4. After the second layer of spiral body is wound, the insulating tape 12 is raised to the third layer along with the bare wire 11 with S-bend, and then the insulating material is placed at the S-bend, and then the wire is bent from top to bottom in sequence into the first spiral unit 101, the second spiral unit 102, ... the Nth spiral unit, the N+1th spiral unit, until the winding of the third layer of spiral body is completed;

[0092] 5. After the third layer of spiral body is wound, the remaining layers of spiral body are wound according to the rules of steps 3 and 4 above until the winding of the entire transformer coil is completed.

[0093] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0094] The term "vertical" is also used in the specification and claims of the present invention, which means basically along the up and down direction, and is not limited to the vertical direction only, and can also be slightly inclined relative to the vertical direction.

[0095] The term "radial" is also used in the specification and claims of the present invention, which means basically along the inward and outward direction, and is not limited to the radial direction passing through the center of the circle, and can also be slightly deviated from the radial direction.

Claims

1. A transformer coil, having a cylindrical structure, wherein each layer in the inner and outer directions of the cylindrical structure is formed by bending the same conductive strip (10) into an axially extending spiral body (100), wherein each spiral unit in the axial direction of the spiral body (100) is formed by bending the conductive strip (10) in a circle along the circumferential direction, and two adjacent spiral units in the axial direction in a bending order are referred to as a first spiral unit (101) and a second spiral unit (102); Features: The conductive strip (10) is composed of a bare conductor (11) and an insulating tape (12) attached to the bare conductor (11) along the length direction, and the width of the insulating tape (12) is greater than the width of the bare conductor (11). The insulating tape (12) has a middle portion (120) and a first side portion (121) and a second side portion (122) respectively located on both sides of the middle portion (120) in the width direction. The first side portion (121) of the insulating tape (12) corresponding to the first spiral unit (101) is located at the first spiral unit. The first spiral unit (101) is located on the outer side of the bare wire (11) corresponding to the first spiral unit (101), the middle part (120) of the insulating tape (12) corresponding to the first spiral unit (101) is located between the bare wires (11) corresponding to the first spiral unit (101) and the second spiral unit (102), so that the bare wires (11) of the two adjacent spiral units are separated by the insulating tape (12), and the second side part (122) of the insulating tape (12) corresponding to the first spiral unit (101) is located on the inner side of the bare wire (11) corresponding to the second spiral unit (102).

2. The transformer coil according to claim 1, characterized in that: The bare wire (11) is a flat wire with a rectangular cross section or a round wire with a circular cross section; When the bare wire (11) is a flat wire, the width dimension A of the insulating tape (12), the width dimension B of the flat wire, and the thickness dimension C of the flat wire satisfy the following relationship: A>1.1×B+C; When the bare wire (11) is a round wire, the width dimension A of the insulating tape (12) and the circumference D of the round wire satisfy the following relationship: 0.5D<A<D.

3. The transformer coil according to claim 2, characterized in that: The first side portion (121) of the insulating tape (12) corresponding to the first spiral unit (101) completely covers the outside of the bare wire (11); and the second side portion (122) of the insulating tape (12) corresponding to the first spiral unit (101) can cover at least a part of the bare wire (11).

4. The transformer coil according to claim 1, characterized in that: The insulating tape (12) is composed of one insulating tape body or at least two insulating tape bodies, and when there is one insulating tape body, the insulating tape body is one of insulating film, insulating paper, and insulating cloth; when there are at least two insulating tape bodies, the insulating tape body is at least one of insulating film, insulating paper, and insulating cloth, and the insulating tape bodies are stacked side by side to form the insulating tape (12).

5. The transformer coil according to any one of claims 1 to 4, characterized in that: The thickness of the insulating tape (12) is the inter-turn insulation thickness between the bare wires (11) of two adjacent spiral units in the axial direction, and the thickness of the insulating tape (12) is ≤0.1 mm.

6. The transformer coil according to claim 5, characterized in that: An interlayer insulating material (2) is selectively provided between two adjacent layers of spiral bodies (100) so that the interlayer insulating thickness of the first and second side portions having the insulating band (12) is ≥0.15 mm.

7. A high voltage coil, comprising at least two cylindrical coils (1) arranged in an axial direction, wherein the outgoing wire of the outer layer of the first cylindrical coil of the two adjacent cylindrical coils (1) is the incoming wire of the inner layer of the second cylindrical coil; characterized in that: The cylindrical coil (1) adopts the transformer coil as claimed in any one of claims 1 to 6, and a radially extending radial air channel (111) or oil channel is provided between two adjacent cylindrical coils (1) to connect the inner and outer spaces of the cylindrical coil (1).

8. The high voltage coil according to claim 7, characterized in that: The high voltage coil is used for a dry-type transformer.

9. A method for winding a transformer coil as claimed in claim 6, characterized in that When an interlayer insulating material (2) is provided between two adjacent layers of spiral bodies (100), the steps are as follows:

1. attaching the first side portion (121) of the insulating tape (12) to the outside of the bare wire (11), arranging the middle portion (120) and the second side portion (122) of the insulating tape (12) on the spirally raised side, and aligning one end of the bare wire (11) with one end of the insulating tape (12) to form a winding start end, and fixing the winding start end; 2. The bare wire (11) and the insulating tape (12) are bent together in a circumferential direction with the bare wire (11) on the inside and the insulating tape (12) on the outside to form a first spiral unit (101), and then bent again in a circumferential direction to form a second spiral unit (102), the bare wire (11) corresponding to the second spiral unit (102) is wound on the second side portion (122) of the insulating tape (12) corresponding to the first spiral unit (101), and the middle portion (120) of the insulating tape (12) corresponding to the first spiral unit (101) is located between the bare wires (11) of the first and second spiral units, and the winding is continued in the above manner until the Nth spiral unit and the N+1th spiral unit are completed to complete the winding of the first layer of spiral body, and the first spiral unit (101), the second spiral unit (102) ... the Nth spiral unit, the N+1th spiral unit in the first layer of spiral body are arranged in sequence along the first axial direction; wherein N is a natural number ≥ 2; 3. After the winding of the first layer of spiral body is completed, an interlayer insulating material (2) is placed on the periphery of the first layer of spiral body, and the insulating tape (12) rises to the second layer along the bare wire (11) with an S-bend, and is bent in sequence along a second axial direction opposite to the first axial direction into a first spiral unit (101), a second spiral unit (102), ... an Nth spiral unit, an N+1th spiral unit, until the winding of the second layer of spiral body is completed; Fourth, after the second layer of spiral body is wound, an interlayer insulating material (2) is placed on the periphery of the second layer of spiral body, and the insulating tape (12) rises to the third layer along with the bare wire (11) with an S-bend, and is bent in sequence along the first axial direction into a first spiral unit (101), a second spiral unit (102), ... an Nth spiral unit, an N+1th spiral unit, until the winding of the third layer of spiral body is completed; 5. After the third layer of spiral body is wound, the remaining layers of spiral body are wound according to the rules of steps 3 and 4 above until the winding of the entire transformer coil is completed; When no interlayer insulating material (2) is provided between two adjacent layers of spiral bodies (100), the steps are as follows:

1. attaching the first side portion (121) of the insulating tape (12) to the outside of the bare wire (11), arranging the middle portion (120) and the second side portion (122) of the insulating tape (12) on the spirally raised side, and aligning one end of the bare wire (11) with one end of the insulating tape (12) to form a winding start end, and fixing the winding start end; 2. The bare wire (11) and the insulating tape (12) are bent together in a circumferential direction with the bare wire (11) on the inside and the insulating tape (12) on the outside to form a first spiral unit (101), and then bent again in a circumferential direction to form a second spiral unit (102), the bare wire (11) corresponding to the second spiral unit (102) is wound on the second side portion (122) of the insulating tape (12) corresponding to the first spiral unit (101), and the middle portion (120) of the insulating tape (12) corresponding to the first spiral unit (101) is located between the bare wires (11) of the first and second spiral units, and the winding is continued in the above manner until the Nth spiral unit and the N+1th spiral unit are completed to complete the winding of the first layer of spiral body, and the first spiral unit (101), the second spiral unit (102),...the Nth spiral unit, and the N+1th spiral unit in the first layer of spiral body are arranged in sequence along the first axial direction; wherein N is a natural number ≥ 2; 3. After the winding of the first layer of the spiral body is completed, the insulating tape (12) is raised to the second layer along with the bare wire (11) with an S-bend, and then an insulating material is placed at the S-bend, and then the wire is bent in sequence along a second axial direction opposite to the first axial direction to form a first spiral unit (101), a second spiral unit (102), ... an Nth spiral unit, an N+1th spiral unit, until the winding of the second layer of the spiral body is completed; Fourth, after the second layer of spiral body winding is completed, the insulating tape (12) is raised to the third layer along with the bare wire (11) with S-bend, and then the insulating material is placed at the S-bend, and then the wire is bent in sequence along the first axial direction to form a first spiral unit (101), a second spiral unit (102), ... an Nth spiral unit, and an N+1th spiral unit, until the winding of the third layer of spiral body is completed; 5. After the third layer of spiral body is wound, the remaining layers of spiral body are wound according to the rules of steps 3 and 4 above until the winding of the entire transformer coil is completed.

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