A winding former, a pancake coil and a transformer

Abstract

The application discloses a winding framework, a cake coil and a transformer, comprising at least one annular framework unit, the annular framework unit having a first axial end and a second axial end, the first axial end being provided with a first spiral groove, the second axial end being provided with a second spiral groove, the first spiral groove being provided with a first positioning port for positioning a winding start end of a first wire cake, the second spiral groove being provided with a second positioning port for positioning a winding end of a second wire cake, a cake-to-cake turning opening being arranged at a position where the first spiral groove and the second spiral groove are connected, and the cake-to-cake turning opening being used for bending a winding tail end of the first wire cake to a winding start end of the second wire cake. The winding framework can realize the winding of positive and negative cakes without the cake turning operation, the winding is very simple, the production efficiency is significantly improved, and in addition, the bending operation of the wire is greatly reduced due to the cake turning operation, and then the risk of internal wire breakage damage is reduced.

Description

A winding bobbin, a disc coil, and a transformer Technical Field

[0001] This invention relates to the field of disc coil winding technology, and more specifically, to a winding frame, a disc coil, and a transformer. Background Technology

[0002] Disc coils are a common type of winding in transformers. Their structure typically uses flat wire wound into a disc shape, with the coil turns arranged radially and then axially. Disc coils offer good heat dissipation, high mechanical strength, and a wide range of applications. Another characteristic of disc coils is that the leads can be located on the same side of the coil, such as inside or outside the disc, eliminating the need for extra turns to accommodate cross-layer entry and exit points, unlike traditional designs. This makes lead exit more convenient.

[0003] However, winding disc-shaped coils is relatively complex. Taking a disc-shaped coil with its leads located inside the coil as an example, the coil discs are arranged alternately in positive and negative directions along the axial direction. The positive coils are wound from the inside out, while the negative coils are wound from the outside in. Winding the coil from the inside out is relatively easy, but winding it from the outside in is much more difficult. Currently, the winding method for positive and negative discs involves winding from the inside out, determining the size and position, and then flipping the coil layer by layer. This process is called "pancake flipping" in the industry. It is cumbersome, has low production efficiency, and makes it difficult to control the winding size. Pancake flipping is currently mainly applicable to flat copper wire windings. The final step of the pancake flipping operation usually requires applying a large force to tighten the flipped coils. For windings using stranded wire, this operation may cause internal wire breakage.

[0004] In summary, how to solve the problems of difficult winding of disc coils and easy damage to the coil wires has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a winding frame, a disc coil, and a transformer to solve the problems of difficult winding of disc coils and easy damage to the coil wires.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A winding frame includes at least one annular frame unit, the annular frame unit having a first axial end and a second axial end, the first axial end being provided with a first spiral groove for winding a first coil of a disc coil, the second axial end being provided with a second spiral groove for winding a second coil of a disc coil, the first spiral groove being provided with a first positioning port for positioning the winding start end of the first coil, the second spiral groove being provided with a second positioning port for positioning the winding end end of the second coil, and a disc-to-disc turning opening being provided at the junction of the first spiral groove and the second spiral groove, the disc-to-disc turning opening being used to allow the winding tail end of the first coil to be bent to the winding start end of the second coil;

[0008] In this case, one of the first and second line cakes is a positive cake, and the other is a negative cake.

[0009] Optionally, both the first positioning port and the second positioning port are located on the inner ring wall of the annular skeleton unit; the inter-disc turning opening is located on the outer ring wall of the annular skeleton unit.

[0010] Optionally, both the first positioning port and the second positioning port are located on the outer ring wall of the annular skeleton unit; the inter-disc turning opening is located on the inner ring wall of the annular skeleton unit.

[0011] Optionally, the first spiral groove is provided with a first anti-detachment part on the groove wall for supporting the first thread cake, and the first anti-detachment part is used to prevent the first thread cake from falling off the first spiral groove.

[0012] And / or, the second spiral groove is provided with a second anti-detachment part on the groove wall for supporting the second thread cake, the second anti-detachment part is used to prevent the second thread cake from falling off the second spiral groove.

[0013] Optionally, when the first anti-detachment part is provided on the first spiral groove, the number of the first anti-detachment parts is multiple and they are arranged at intervals on the inner ring groove wall of each annular groove of the first spiral groove.

[0014] When the second anti-detachment part is provided on the second spiral groove, there are multiple second anti-detachment parts, which are arranged at intervals on the inner ring groove wall of each annular groove of the second spiral groove.

[0015] Optionally, the bottom surface of the first spiral groove is provided with an oil intrusion hole that extends to the bottom surface of the second spiral groove.

[0016] Optionally, the number of oil intrusion holes is multiple, and they are arranged at intervals on the bottom surface of each annular groove of the first spiral groove.

[0017] Optionally, the annular skeleton unit is made of insulating material.

[0018] Optionally, the first axial end is provided with a first connecting portion, and the second axial end is provided with a second connecting portion adapted to the first connecting portion.

[0019] Optionally, one of the first connecting part and the second connecting part is a connecting slot, and the other is a connecting tongue.

[0020] Optionally, the winding skeleton includes a plurality of the ring skeleton units, wherein the first connecting portion of one of the two adjacent ring skeleton units is connected to the second connecting portion of the other ring skeleton unit.

[0021] Compared to the background description, the aforementioned winding bobbin includes at least one annular bobbin unit. The annular bobbin unit has a first axial end and a second axial end. The first axial end is provided with a first spiral groove for winding a first coil of a disc-shaped coil, and the second axial end is provided with a second spiral groove for winding a second coil of a disc-shaped coil. The first spiral groove is provided with a first positioning opening for positioning the winding start of the first coil, and the second spiral groove is provided with a second positioning opening for positioning the winding end of the second coil. A bend opening between the first and second spiral grooves is provided at the junction of the first and second spiral grooves. The bend opening between the coils allows the winding end of the first coil to be bent to the winding start of the second coil. One of the first and second coils is a positive coil, and the other is a negative coil. In the actual winding process of the disc coil, the first coil is led out from the first positioning port and then wound along the first spiral groove until the end of the first coil is reached. Then, it bends from the turning opening between the coils towards the second spiral groove and winds the second coil along the second spiral groove until the end of the second coil is reached and the lead-out end is led out. One of the first and second coils is the positive coil and the other is the negative coil. The coil can be wound in both directions without the need for flipping, which is very simple and significantly improves production efficiency. In addition, since the coil flipping operation is eliminated, the bending operation of the wire is greatly reduced, thereby reducing the risk of internal wire breakage damage.

[0022] In addition, the present invention also provides a disc coil, comprising a winding frame and a coil wound on the winding frame, wherein the winding frame is the winding frame described in any of the above embodiments. Since the winding frame described above has the aforementioned technical effects, the disc coil having the winding frame should also have corresponding technical effects, which will not be elaborated further here.

[0023] Furthermore, the present invention also provides a transformer, comprising an iron core and a disc-shaped coil mounted on the iron core, wherein the disc-shaped coil is the disc-shaped coil described in the above-described scheme. Since this disc-shaped coil possesses the aforementioned technical effects, a transformer having this disc-shaped coil should also possess corresponding technical effects, which will not be elaborated further here. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 is a schematic diagram of the first and second positioning ports of the annular skeleton unit provided in the embodiment of the present invention, located on the inner ring wall and viewed from the first spiral groove side.

[0026] Figure 2 is a schematic diagram of the structure of the annular skeleton unit provided in the embodiment of the present invention, with the first positioning port and the second positioning port located on the inner ring wall and the first and second wires wound around it, from a frontal view.

[0027] Figure 3 is a schematic diagram of the structure of the annular skeleton unit provided in the embodiment of the present invention, with the first positioning port and the second positioning port located on the inner ring wall and the first and second wire cakes wound around it, from the perspective of the first spiral groove side.

[0028] Figure 4 is a schematic diagram of the structure of the annular skeleton unit provided in the embodiment of the present invention, with the first positioning port and the second positioning port located on the inner ring wall and the first and second wire cakes wound around it, from the perspective of the second spiral groove side.

[0029] Figure 5 is a schematic diagram of the first and second positioning ports of the annular skeleton unit provided in the embodiment of the present invention, located on the outer ring wall and viewed from the first spiral groove side.

[0030] Figure 6 is a schematic diagram of the axial structure of the annular skeleton unit provided in the embodiment of the present invention, where the first positioning port and the second positioning port are located on the inner ring wall and the number of turns of the first and second wire discs are both three turns, from the perspective of the first spiral groove side.

[0031] Figure 7 is an axial side view of the ring skeleton unit provided in an embodiment of the present invention, which has a first connecting part and a second connecting part;

[0032] Figure 8 is a schematic diagram of the structure of the winding skeleton provided in the embodiment of the present invention, which uses multiple ring skeleton units spliced ​​together in sequence.

[0033] Among them, in Figures 1-8:

[0034] 1. Ring-shaped skeleton unit, 1. First connecting part 1a, 1. Second connecting part 1b, 1. First spiral groove 11, 1. First anti-detachment part 110, 1. Second spiral groove 12, 1. Second anti-detachment part 120, 1. First positioning port 13, 1. Second positioning port 14, 1. Cake-to-cake turning opening 15, 1. Inner ring wall 16, 1. Outer ring wall 17, 1. Oil intrusion hole 18, 1. Middle ring wall 19.

[0035] First thread cake 2, the starting point of winding the first thread cake 20;

[0036] Second thread 3, winding end of the second thread 30. Detailed Implementation

[0037] The core of this invention is to provide a winding frame, a disc coil, and a transformer to solve the problems of difficult winding of disc coils and easy damage to the coil wires.

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Referring to Figures 1-8, the present invention specifically provides a winding skeleton, including at least one annular skeleton unit 1. The annular skeleton unit 1 has a first axial end and a second axial end. The first axial end is provided with a first spiral groove 11 for winding a first coil 2 of a disc coil, and the second axial end is provided with a second spiral groove 12 for winding a second coil 3 of a disc coil. The first spiral groove 11 is provided with a first positioning port 13 for positioning the winding start end 20 of the first coil 2, and the second spiral groove 12 is provided with a second positioning port 14 for positioning the winding end end 30 of the second coil 3. A coil turning opening 15 is provided at the junction of the first spiral groove 11 and the second spiral groove 12. The coil turning opening 15 is used to bend the winding tail end of the first coil 2 to the winding start end of the second coil 3. Among them, one of the first coil 2 and the second coil 3 is a positive coil, and the other is a negative coil.

[0040] In the actual winding process of the disc coil, the first disc 2 is led out from the first positioning port 13 (that is, the winding start 20 of the first disc 2), and then wound along the first spiral groove 11 until the winding end of the first disc 2 is reached. Then, it bends from the disc turning opening 15 to the second spiral groove 12, and then winds the second disc 3 along the second spiral groove 12 until the winding end of the second disc 3 is reached and the lead-out end (that is, the winding end 30 of the second disc 3) is led out. Among them, the first disc 2 and the second disc 3 are the positive discs and the other is the negative discs. There is no need to flip the discs, and the winding of the positive and negative discs can be realized. The winding is very simple and the production efficiency is significantly improved. In addition, since there is no need to flip the discs, the bending operation of the wire is greatly reduced, thereby reducing the risk of wire breakage damage inside the wire.

[0041] In some specific implementations, referring to Figures 1-4, the first positioning port 13 and the second positioning port 14 can both be disposed on the inner ring wall 16 of the annular frame unit 1; the inter-panel turning opening 15 is disposed on the outer ring wall 17 of the annular frame unit 1. This arrangement enables the annular frame unit 1 to achieve inner lead-out. According to the typical magnetic field distribution rules of transformers, the magnetic field strength between the primary coil and the secondary coil is the highest, while the electric field strength inside the primary coil and outside the secondary coil is close to zero. The higher the magnetic field strength of the conductor, the stronger its proximity effect and the higher the eddy current loss. Therefore, when the annular frame unit 1 is applied to the inner coil (generally a low-voltage coil), it can make the inner lead-out wires located in a position with weaker magnetic field strength, thereby helping to reduce eddy current losses.

[0042] In some other specific embodiments, referring to Figure 5, the first positioning port 13 and the second positioning port 14 can both be disposed on the outer ring wall 17 of the annular frame unit 1; the inter-panel turning opening 15 is disposed on the inner ring wall 16 of the annular frame unit 1. This arrangement allows the lead wire of the annular frame unit 1 to be located outside the coil. When the annular frame unit 1 is applied to the outer coil (generally a high-voltage coil), according to the typical magnetic field distribution rules of the transformer, the magnetic field strength between the primary coil and the secondary coil is the highest, and the electric field strength inside the primary coil and outside the secondary coil is close to zero. The higher the magnetic field strength of the conductor, the stronger its proximity effect and the higher the eddy current loss. This arrangement allows the outer lead wire to be located in a position with a weaker magnetic field strength, thereby helping to reduce eddy current loss.

[0043] It should be noted that, referring to Figures 1-8, an intermediate annular wall 19 should also be provided between the inner annular wall 16 and the outer annular wall 17 of the annular skeleton unit 1, thereby forming a winding groove structure of the first spiral groove 11 and the second spiral groove 12. The number of layers of winding grooves formed by the first spiral groove 11 and the second spiral groove 12 can be selected and set according to the actual needs of the first wire disc 2 and the second wire disc 3. No further specific limitations are made here. For example, it can be designed as a two-layer winding groove structure as shown in Figures 1-5, or as a three-layer winding groove structure as shown in Figure 6, or even a structure with more than three layers of winding grooves. In actual application, the arrangement can be selected according to actual needs, and no further specific limitations are made here.

[0044] In some other specific embodiments, referring to Figures 1-3, structural diagrams 5 and 6, a first anti-detachment part 110 can be provided on the groove wall of the first spiral groove 11 used to support the first thread cake 2. The first anti-detachment part 110 is used to prevent the first thread cake 2 from falling off the first spiral groove 11, thereby ensuring the stability of the first thread cake 2 on the first spiral groove 11 of the annular skeleton unit 1. Similarly, referring to Figures 2 and 4, a second anti-detachment part 120 can be provided on the groove wall of the second spiral groove 12 used to support the second thread cake 3. The second anti-detachment part 120 is used to prevent the second thread cake 3 from falling off the second spiral groove 12, thereby ensuring the stability of the second thread cake 3 on the second spiral groove 12 of the annular skeleton unit 1. The specific structural form of the first anti-detachment part 110 and the second anti-detachment part 120 can be an elastic latch formed on the groove wall of the second spiral groove 12 used to support the second thread cake 3, with the end of the elastic latch protruding radially along the annular skeleton unit 1 to form a limiting structure. Of course, other structural forms can be designed in practical applications, and no further specific limitations are made here. Compared with the traditional pancake coil winding structure, the above-mentioned arrangement of the first anti-detachment part 110 and the second anti-detachment part 120 eliminates the cumbersome wire binding and fixing operation, making winding simpler and more convenient.

[0045] In a further embodiment, referring to Figures 1-3, structural diagrams 5 and 6, when a first anti-detachment part 110 is provided on the first spiral groove 11, the number of the first anti-detachment parts 110 is preferably multiple and they are arranged at intervals on the inner ring groove wall of each annular groove of the first spiral groove 11, for example, evenly distributed along the circumference of the annular skeleton unit 1, and arranged sequentially facing each other along the radial direction of the annular skeleton unit 1. By designing multiple first anti-detachment parts, the anti-detachment effect of the first thread cake 2 can be improved. Similarly, referring to Figure 2 and Figure 4, when a second anti-detachment part 120 is provided on the second spiral groove 12, the number of the second anti-detachment parts 120 is also preferably multiple and they are arranged at intervals on the inner ring groove wall of each annular groove of the second spiral groove 12, for example, evenly distributed along the circumference of the annular skeleton unit 1, and arranged sequentially facing each other along the radial direction of the annular skeleton unit 1. By designing multiple second anti-detachment parts, the anti-detachment effect of the second thread cake 3 can be improved.

[0046] In some other specific embodiments, referring to Figures 1, 5, and 6, an oil ingress hole 18 extending through to the bottom surface of the second spiral groove 12 can be provided on the bottom surface of the first spiral groove 11. By designing this oil ingress hole 18, the oil immersion effect of the conductor can be improved when the annular skeleton unit 1 is wound and applied to an oil-immersed transformer, thereby improving the insulation capacity. It should be noted that the specific structural form of the oil ingress hole 18 can be a waist-shaped hole or a through hole of other shapes, such as a circular hole. In addition, when opening it, it is preferable to remove part of the material on the inner annular groove wall of the second spiral groove 12 corresponding to the position where the oil ingress hole 18 is opened to form a certain oil guiding groove, which further helps the oil immersion effect of the conductor.

[0047] In a further embodiment, the number of the aforementioned oil ingress holes 18 is preferably multiple, and they are arranged at intervals on the bottom surface of each annular groove of the first spiral groove 11, for example, evenly distributed along the circumference of the annular skeleton unit 1, and arranged sequentially facing each other along the radial direction of the annular skeleton unit 1. By designing a structure with multiple oil ingress holes 18, the oil immersion effect of the wire is further improved.

[0048] It should be noted that the aforementioned annular frame unit 1 is preferably made of an insulating material, such as epoxy resin. By designing the annular frame unit 1 as an insulating material, the inner ring wall 16, the outer ring wall 17, and the middle ring wall 19 can form inter-turn insulation. At the same time, the walls formed by the bottom of the first spiral groove 11 and the bottom of the second spiral groove 12 corresponding to the annular frame unit 1 constitute inter-pane insulation of the pancake coil, thereby giving the wound pancake coil a better insulation effect.

[0049] In some specific implementations, referring to Figure 7, the first axial end may be provided with a first connecting portion 1a, and the second axial end may be provided with a second connecting portion 1b adapted to the first connecting portion 1a. By designing this structural form, the annular skeleton unit 1 can be combined according to actual needs. That is, the winding skeleton may specifically include multiple annular skeleton units 1. Referring to Figure 8, multiple annular skeleton units 1 are spliced ​​along the axial direction. The first connecting portion 1a of one annular skeleton unit 1 of two adjacent annular skeleton units 1 is connected to the second connecting portion 1b of the other annular skeleton unit 1, thereby realizing the expansion of the number of turns and the expansion of the pie group, thus meeting the needs of different transformer operating conditions.

[0050] It should be noted that, of the aforementioned first connecting part 1a and second connecting part 1b, one is preferably a connecting slot, and the other is preferably a connecting tongue. By designing the connecting slot and connecting tongue as described above, the assembly and disassembly of two adjacent annular frame units 1 becomes more convenient. It is understood that the aforementioned connection slot and connecting tongue configuration is merely an example of the connection method between the first connecting part 1a and the second connecting part 1b in this embodiment of the invention. In actual applications, other detachable or non-detachable connection methods can be designed, and no further specific limitations are made here.

[0051] In addition, the present invention also provides a disc coil, comprising a winding frame and a coil wound on the winding frame, wherein the winding frame is the winding frame described in any of the above embodiments. Since the winding frame described above has the aforementioned technical effects, the disc coil having the winding frame should also have corresponding technical effects, which will not be elaborated further here.

[0052] Furthermore, the present invention also provides a transformer, comprising an iron core and a disc-shaped coil mounted on the iron core, wherein the disc-shaped coil is the disc-shaped coil described in the above-described scheme. Since this disc-shaped coil possesses the aforementioned technical effects, a transformer having this disc-shaped coil should also possess corresponding technical effects, which will not be elaborated further here.

[0053] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] It should be understood that the use of terms such as "system," "device," "unit," and / or "module" in this application is merely one method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0055] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0056] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0057] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0058] If a flowchart is used in this application, it is used to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0059] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A winding frame, characterized in that, The device includes at least one annular skeleton unit (1), which has a first axial end and a second axial end. The first axial end is provided with a first spiral groove (11) for winding a first coil (2) of a disc coil, and the second axial end is provided with a second spiral groove (12) for winding a second coil (3) of a disc coil. The first spiral groove (11) is provided with a first positioning port (13) for positioning the winding start end (20) of the first coil (2), and the second spiral groove (12) is provided with a second positioning port (14) for positioning the winding end end (30) of the second coil (3). A disc-to-coil turning opening (15) is provided at the junction of the first spiral groove (11) and the second spiral groove (12), and the disc-to-coil turning opening (15) is used for the winding end of the first coil (2). The end is bent to the winding start of the second coil (3); wherein, one of the first coil (2) and the second coil (3) is a positive coil and the other is a negative coil; the number of the winding skeleton is two, and they are the inner coil skeleton and the outer coil skeleton of the transformer, respectively; in the inner coil skeleton, the first positioning port (13) and the second positioning port (14) are both set on the inner ring wall (16) of the ring skeleton unit (1); the inter-coil turning opening (15) is set on the outer ring wall (17) of the ring skeleton unit (1); in the outer coil skeleton, the first positioning port (13) and the second positioning port (14) are both set on the outer ring wall (17) of the ring skeleton unit (1); the inter-coil turning opening (15) is set on the inner ring wall (16) of the ring skeleton unit (1).

2. The winding frame as described in claim 1, characterized in that, The first spiral groove (11) is provided with a first anti-detachment part (110) on the groove wall for supporting the first thread cake (2), and the first anti-detachment part (110) is used to prevent the first thread cake (2) from falling off from the first spiral groove (11); and / or, the second spiral groove (12) is provided with a second anti-detachment part (120) on the groove wall for supporting the second thread cake (3), and the second anti-detachment part (120) is used to prevent the second thread cake (3) from falling off from the second spiral groove (12).

3. The winding frame as described in claim 2, characterized in that, When the first spiral groove (11) is provided with a first anti-detachment part (110), the number of the first anti-detachment parts (110) is multiple and they are arranged at intervals on the inner ring groove wall of each annular groove of the first spiral groove (11); when the second spiral groove (12) is provided with a second anti-detachment part (120), the number of the second anti-detachment parts (120) is multiple and they are arranged at intervals on the inner ring groove wall of each annular groove of the second spiral groove (12).

4. The winding frame as described in claim 1, characterized in that, The bottom surface of the first spiral groove (11) is provided with an oil intrusion hole (18) that extends to the bottom surface of the second spiral groove (12).

5. The winding frame as described in claim 4, characterized in that, The number of oil intrusion holes (18) is multiple, and they are arranged at intervals on the bottom surface of each annular groove of the first spiral groove (11).

6. The winding frame as described in claim 1, characterized in that, The ring-shaped skeleton unit (1) is made of insulating material.

7. The winding frame as described in claim 1, characterized in that, The first axial end is provided with a first connecting part (1a), and the second axial end is provided with a second connecting part (1b) that is adapted to the first connecting part (1a).

8. The winding frame as described in claim 7, characterized in that, One of the first connecting part (1a) and the second connecting part (1b) is a connecting slot, and the other is a connecting tongue.

9. The winding frame as described in claim 7, characterized in that, The winding skeleton includes a plurality of ring skeleton units (1), and the first connecting part (1a) of one of the two adjacent ring skeleton units (1) is connected to the second connecting part (1b) of the other ring skeleton unit (1).

10. A disc-shaped coil, comprising a winding bobbin and a coil wound on the winding bobbin, characterized in that, The winding frame is the winding frame as described in any one of claims 1-9.

11. A transformer, comprising an iron core and a disc-shaped coil mounted on the iron core, characterized in that, The disc coil is the disc coil as described in claim 10.

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