Double-layer multi-spiral coil formed by parallelly winding two wires in radial direction

Abstract

The utility model discloses a double-layer multi-spiral coil formed by parallelly winding two wires in the radial direction. The double-layer multi-spiral coil comprises a double-layer multi-spiral coil body, heat dissipation grooves and capacity expansion grooves. The two heat dissipation grooves are spirally distributed and symmetrically formed in the double-layer multi-spiral coil body; an expansion groove is formed in the heat dissipation groove; each heat dissipation groove comprises a flaring part and a capacity increasing part; the flaring part is of an inclined structure, and the outer side of the heat dissipation groove is a narrow opening. The capacity increasing part is of an arc-shaped structure; the expansion groove is of a V-shaped structure, and the tip end of the expansion groove is arranged in the direction away from the flaring part. Heat dissipation holes are further included; the double-layer multi-spiral coil formed by parallel winding of the two wires in the radial direction is simple and reasonable in structure and ingenious in design, heat generated by the double-layer multi-spiral coil body can be dissipated through the heat dissipation grooves and the heat dissipation holes, the heat dissipation effect is good, and the heat dissipation effect is good. And the service life of the double-layer multi-spiral coil body is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to a double-layer multi-helix coil with two radially wound conductors. Background Technology

[0002] A double-layer multi-helix coil is a type of coil that uses multiple conductors connected in parallel along the axial direction. The coil consists of two layers with opposite winding directions, and the two layers of conductors are connected and transitioned at the ends of the coil. The leakage flux generated between the two layers by the current flowing through the coil cancels each other out. Moreover, this structure does not have the large current leads that are drawn from the bottom upwards in traditional single-layer coils, thereby reducing eddy current losses in the coil and surrounding structural components. It has high technical and economic performance and is widely used in the low-voltage windings of large-capacity transformers.

[0003] For example, Chinese utility model patent CN214797055U discloses a spiral coil structure in a transformer, including inner and outer double-layer spiral coils. In each layer of spiral coils, after one of two adjacent turns is fully wound, the coil is wound in the opposite direction along the axial direction to complete the winding. This utility model, while taking into account electromagnetic performance, helps to reduce the coil height and improve the coil fill factor.

[0004] Currently, in the market, double-layer multi-helix coils, due to their mostly circular or square cross-sections, generate a large amount of heat that is difficult to dissipate during operation. This not only poses a safety hazard but also easily affects the service life of the double-layer multi-helix coils. Utility Model Content

[0005] The purpose of this invention is to provide a double-layer multi-helix coil with two radially wound conductors to solve the problem of the large amount of heat generated by the double-layer multi-helix coil during operation, as mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a double-layer multi-helix coil with two radially wound conductors, comprising a double-layer multi-helix coil body, a heat dissipation groove, and an expansion groove; the two heat dissipation grooves are symmetrically arranged in a spiral distribution on the double-layer multi-helix coil body; an expansion groove is provided inside the heat dissipation groove.

[0007] Preferably, the heat dissipation groove includes a flared section and a capacity-enhancing section; the flared section has an inclined structure, and the outer side of the heat dissipation groove has a narrow opening.

[0008] Preferably, the expansion section has an arc-shaped structure.

[0009] Preferably, the expansion groove has a V-shaped structure, and the tip of the expansion groove is positioned away from the flared part.

[0010] Preferably, it also includes heat dissipation holes; a plurality of the heat dissipation holes are arranged in a ring array on the double-layer multi-helix coil body.

[0011] Preferably, it also includes spiral A, spiral B, spiral C, inner coil paper tube, outer coil paper tube, inner spiral wire transposition, outer spiral wire transposition, and inner and outer spiral transposition.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model, by setting heat dissipation grooves, expansion grooves, and heat dissipation holes, winds the double-layer multi-helix coil body onto an iron core. The heat generated by the outer double-layer multi-helix coil body during operation can be dissipated into the air through the heat dissipation grooves, while the heat generated by the inner double-layer multi-helix coil body during operation will first accumulate in the heat dissipation grooves. By setting the flared part as an inclined structure, the expansion part as an arc structure, and the expansion groove as a V-shaped structure, the capacity of the heat dissipation grooves can be increased. Finally, the heat is gradually discharged and dissipated into the air through the heat dissipation holes. Compared with the prior art, this utility model has a simple and reasonable structure and ingenious design. It can dissipate the heat generated by the double-layer multi-helix coil body through the heat dissipation grooves and heat dissipation holes, thus extending the service life of the double-layer multi-helix coil body.

[0014] 2. Compared with traditional structures, since two wires are wound in parallel within each radial spiral, the size of a single wire and the number of cores can be reduced, improving manufacturability and thus reducing the difficulty of processing and manufacturing the wires and coils, and reducing the risk of wire breakage and coil winding failure. Through three transpositions in the middle of the inner and outer layers and the lower part between the inner and outer layers, the circulating current between the multiple parallel-wound wires is reduced, preventing local overheating of the coil and improving the safety and reliability of the transformer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the coil structure in Example 1;

[0016] Figure 2 This is a schematic diagram of the overall structure of Example 2;

[0017] Figure 3 This is a cross-sectional view of the double-layer multi-helix coil body in Example 2;

[0018] Figure 4 Example 2 Figure 2 Enlarged diagram of point A in the middle.

[0019] In the picture:

[0020] 1. Helix A; 2. Helix B; 3. Helix C; 4. Inner coil paper tube; 5. Outer coil paper tube; 6. Inner helix wire transposition; 7. Outer helix wire transposition; 8. Inner and outer helix transposition; 9. Double-layer multi-helix coil body; 10. Heat dissipation groove; 11. Capacity expansion groove; 12. Heat dissipation hole; 1001. Flared section; 1002. Capacity expansion section. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1:

[0023] Please see Figure 1 This utility model provides a technical solution: a double-layer multi-helix coil with two radially wound wires, including helix A1, helix B2, helix C3, inner coil paper tube 4, outer coil paper tube 5, inner helical wire transposition 6, outer helical wire transposition 7, and inner and outer helical transposition 8.

[0024] The coil described in this utility model has a coaxial structure with inner and outer layers. For clarity, the axes of the inner and outer coils are shifted to illustrate the two coil layers separately, as shown below. Figure 1 The left view is a schematic diagram of the inner layer structure of the coil, and the right view is a schematic diagram of the outer layer structure of the coil. The two layers of coil are wound concentrically in the axial direction. The schematic diagram shows a double-layer triple-helix coil with two conductors wound in the radial direction. Other numbers of helices are also possible. The coil is wound on the inner coil paper tube 4. The three helices are numbered in the axial direction as helical A1, helical B2, and helical C3 respectively. There are two conductors in the radial direction in each helix. Starting from the upper part of the inner layer, after winding 1 / 4 of the total number of turns, the two wires wound in parallel within each spiral in the middle of the inner layer undergo a transposition of the inner spiral wires in the radial direction 6. Then, after winding another 1 / 4 of the total number of turns, the inner and outer spirals are transposed at the lower part of the coil 8. While raising the layers, the spirals are interchanged in the axial direction. After the transposition, the wires pass through the outer coil paper tube 5 between the inner and outer layers and rise to the outer coil. After winding 1 / 4 of the total number of turns, the two wires wound in parallel within each spiral in the middle of the outer layer undergo a transposition of the outer spiral wires in the radial direction 7. Then, after winding another 1 / 4 of the total number of turns, the wires are led out from the upper part of the outer coil.

[0025] Example 2:

[0026] Please see Figures 2 to 4This utility model provides a technical solution: a double-layer multi-helix coil with two radially wound wires, including a double-layer multi-helix coil body 9, a heat dissipation groove 10, and an expansion groove 11; the two heat dissipation grooves 10 are symmetrically arranged in a spiral on the double-layer multi-helix coil body 9; the expansion groove 11 is provided in the heat dissipation groove 10; the heat dissipation groove 10 includes a flared part 1001 and an expansion part 1002; the flared part 1001 has an inclined structure, and the outer side of the heat dissipation groove 10 is narrow; the expansion part 1002 has an arc-shaped structure; the expansion groove 11 has a V-shaped structure, and the tip of the expansion groove 11 is arranged away from the flared part 1001; it also includes heat dissipation holes 12; a plurality of heat dissipation holes 12 are arranged in a ring array on the double-layer multi-helix coil body 9.

[0027] This invention, by setting heat dissipation grooves 10, expansion grooves 11, and heat dissipation holes 12, winds a double-layer multi-helix coil body 9 onto an iron core. The heat generated by the outer double-layer multi-helix coil body 9 during operation can be dissipated into the air through the heat dissipation grooves 10, while the heat generated by the inner double-layer multi-helix coil body 9 during operation will first accumulate in the heat dissipation grooves 10. By setting the flared part 1001 as an inclined structure, the expansion part 1002 as an arc structure, and the expansion groove 11 as a V-shaped structure, the capacity of the heat dissipation grooves 10 can be increased. Finally, the heat is gradually discharged and dissipated into the air through the heat dissipation holes 12. Compared with the prior art, this invention has a simple and reasonable structure and ingenious design. It can dissipate the heat generated by the double-layer multi-helix coil body 9 through the heat dissipation grooves 10 and heat dissipation holes 12, thus extending the service life of the double-layer multi-helix coil body 9.

[0028] Working principle: In use, the double-layer multi-helix coil body 9 is wound on the iron core. The heat generated by the outer double-layer multi-helix coil body 9 during operation can be dissipated into the air through the heat dissipation groove 10. The heat generated by the inner double-layer multi-helix coil body 9 during operation will first accumulate in the heat dissipation groove 10. By setting the flared part 1001 as an inclined structure, the capacity expansion part 1002 as an arc structure, and the capacity expansion groove 11 as a V-shaped structure, the capacity of the heat dissipation groove 10 can be increased. Finally, the heat is gradually discharged and dissipated into the air through the heat dissipation hole 12.

[0029] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-layer multi-helix coil with two radially wound conductors, characterized in that, It includes a double-layer multi-helix coil body (9), a heat dissipation groove (10) and an expansion groove (11); the two heat dissipation grooves (10) are symmetrically opened on the double-layer multi-helix coil body (9) in a spiral distribution; the expansion groove (11) is opened in the heat dissipation groove (10).

2. A double-layer multi-helix coil with two radially wound conductors according to claim 1, characterized in that, The heat dissipation groove (10) includes a flared section (1001) and a capacity-enhancing section (1002); the flared section (1001) is an inclined structure, and the outer side of the heat dissipation groove (10) is a narrow opening.

3. A double-layer multi-helix coil with two radially wound conductors according to claim 2, characterized in that, The expansion section (1002) has an arc-shaped structure.

4. A double-layer multi-helix coil with two radially wound conductors according to claim 2, characterized in that, The expansion groove (11) has a V-shaped structure, and the tip of the expansion groove (11) is positioned away from the flared part (1001).

5. A double-layer multi-helix coil with two radially wound conductors according to claim 1, characterized in that, It also includes heat dissipation holes (12); a plurality of the heat dissipation holes (12) are arranged in a ring array on the double-layer multi-helix coil body (9).

6. A double-layer multi-helix coil with two radially wound conductors according to claim 1, characterized in that, It also includes spiral A (1), spiral B (2), spiral C (3), inner coil paper tube (4), outer coil paper tube (5), inner spiral wire transposition (6), outer spiral wire transposition (7), and inner and outer spiral transposition (8).

Images