An oil-immersed core structure and reactor employing a U-shaped yoke structure

Abstract

This invention relates to an oil-immersed core structure employing a U-shaped yoke structure. The invention includes a core post fitted with windings; and a yoke portion comprising an upper yoke and a lower yoke, which are respectively connected to both ends of the core post and cooperate with the core post to form a closed magnetic circuit. The upper and lower yokes are stacked in a double U-shape, each double U-shape including a first stacked edge. The two ends of the first stacked edge extend along opposite sides of the first stacked edge to form two symmetrically arranged U-shaped stacked rings. A second stacked edge is provided between each U-shaped stacked ring and the first stacked edge. An insulating plate is provided between the second stacked edge and both the U-shaped stacked ring and the first stacked edge. This invention effectively absorbs leakage magnetic flux between the core post and the yoke ends, solving the problem of localized overheating and effectively preventing the leakage magnetic flux from entering the casing wall and causing heat generation.

Description

Technical Field

[0001] This invention relates to the field of power equipment design and manufacturing technology, and in particular to an oil-immersed core structure and reactor using a U-shaped yoke structure. Background Technology

[0002] In "I"-shaped three-phase oil-immersed core reactors and single-phase oil-immersed reactors, the yoke typically uses a common laminated type. When magnetic flux enters the yoke from the core column, leakage flux at this point can easily cause localized overheating. Existing high-voltage oil-immersed core reactors incorporate magnetic shielding at this point to reduce the impact, but this increases costs and requires more sophisticated manufacturing processes. Summary of the Invention

[0003] Therefore, the present invention provides an oil-immersed iron core structure and reactor with a U-shaped iron yoke structure, which improves the iron core structure of the reactor by adding a wound U-shaped structure to the original laminated iron yoke, so that the magnetic flux of the iron core column of the reactor flows into the iron yoke in a U-shaped stacked ring shape, avoiding right-angle entry and local overheating.

[0004] To solve the above-mentioned technical problems, the present invention provides an oil-immersed iron core structure with a U-shaped iron yoke structure, comprising:

[0005] Iron core column, wherein the iron core column is fitted with windings;

[0006] The iron yoke section includes an upper iron yoke and a lower iron yoke, which are respectively connected to the two ends of the iron core column and cooperate with the iron core column to form a closed magnetic circuit.

[0007] The upper and lower yokes are stacked in a double U-shape. The double U-shape includes a first stacking edge. The two ends of the first stacking edge extend along opposite sides of the first stacking edge to form two symmetrically arranged U-shaped stacking rings. A second stacking edge is provided between each U-shaped stacking ring and the first stacking edge. An insulating plate is provided between the second stacking edge and the U-shaped stacking ring and the first stacking edge.

[0008] In one embodiment of the present invention, a first connecting through hole is provided along the axial direction of the iron core column, and a second connecting through hole is provided on the first stacked edge to cooperate with the first connecting through hole.

[0009] In one embodiment of the present invention, the two ends of the U-shaped stacked ring are U-shaped structures, and the U-shaped structure includes an arc-shaped side and two straight sides connected to the arc-shaped side.

[0010] In one embodiment of the present invention, a through cavity is formed between the U-shaped structure and the second overlapping edge.

[0011] In one embodiment of the present invention, the insulating plate is disposed between the second stacked edge and the two straight edges.

[0012] In one embodiment of the present invention, three iron core columns are arranged side by side between the upper yoke and the lower yoke.

[0013] In one embodiment of the present invention, a grounding wire is connected to the upper yoke and / or the lower yoke.

[0014] In one embodiment of the present invention, a fastening fitting is also included, wherein the upper yoke and the lower yoke are each connected to the upper and lower ends of the core column by the fastening fitting.

[0015] In one embodiment of the present invention, the fastening fitting is provided with yoke fastening bolts.

[0016] The present invention also provides a reactor, including the oil-immersed core structure with a U-shaped yoke structure.

[0017] The technical solution of the present invention has the following advantages compared with the prior art:

[0018] The present invention describes an oil-immersed core structure with a U-shaped yoke, which improves the reactor core structure. By adding a wound U-shaped structure to the original laminated yoke, the magnetic flux of the reactor core column flows into the yoke in a U-shaped stacked ring, avoiding right-angle entry that would cause local overheating. The present invention can effectively absorb the leakage magnetic flux between the core column and the end of the yoke, solve the problem of local overheating, and effectively prevent the leakage magnetic flux from entering the tank wall and causing heat generation. Attached Figure Description

[0019] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of the oil-immersed iron core structure of the U-shaped iron yoke structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the iron yoke structure of the present invention.

[0022] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0023] Figure 4 This is a diagram of fastening hardware connections.

[0024] Explanation of reference numerals in the accompanying drawings: 1. Iron core post; 11. First connecting through hole; 2. Iron yoke; 21. Upper iron yoke; 22. Lower iron yoke; 3. First overlapping edge; 31. Second connecting through hole; 4. U-shaped overlapping ring; 41. Arc-shaped edge; 42. Straight edge; 5. Second overlapping edge; 6. Insulating plate; 7. Through cavity; 8. Grounding wire; 9. Fastening hardware; 10. Yoke fastening bolt. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0026] Reference Figures 1 to 4 As shown, an oil-immersed core structure employing a U-shaped yoke structure according to the present invention includes:

[0027] Iron core column 1, wherein the iron core column 1 is fitted with windings;

[0028] The iron yoke 2 includes an upper iron yoke 21 and a lower iron yoke 22, which are respectively connected to the two ends of the iron core column 1 and cooperate with the iron core column 1 to form a closed magnetic circuit.

[0029] The upper yoke 21 and the lower yoke 22 are stacked in a double U-shaped structure. The double U-shaped structure includes a first stacking edge 3. The two ends of the first stacking edge 3 extend along the opposite sides of the first stacking edge 3 to form two symmetrically arranged U-shaped stacking rings 4. A second stacking edge 5 is provided between each U-shaped stacking ring 4 and the first stacking edge 3. An insulating plate 6 is provided between the second stacking edge 5 and the U-shaped stacking ring 4 and the first stacking edge 3.

[0030] Specifically, a first connecting through hole 11 is provided along the axial direction of the core post 1, and a second connecting through hole 31 is provided on the first overlapping edge 3 to mate with the first connecting through hole 11. This facilitates the axial connection between the core post 1 and the upper yoke 21 and the lower yoke 22. In this embodiment, the connection is achieved using a screw.

[0031] Specifically, the two ends of the U-shaped stacked ring 4 are U-shaped structures, and the U-shaped structure includes an arc-shaped side 41 and two straight sides 42 connected to the arc-shaped side 41.

[0032] Specifically, a cavity 7 is formed between the U-shaped structure and the second overlapping edge 5.

[0033] Specifically, the insulating plate 6 is disposed between the second stacked edge 5 and the two straight edges 42. Through this arrangement, the insulating plate 6 has high magnetic resistance, which can isolate magnetic lines of force and guide them to flow along the U-shaped direction at both ends.

[0034] Specifically, three iron core columns 1 are arranged side by side between the upper iron yoke 21 and the lower iron yoke 22.

[0035] Specifically, the upper yoke 21 and / or the lower yoke 22 are connected to a grounding wire 8 to facilitate the grounding of the iron core.

[0036] Specifically, it also includes fastening fittings 9, wherein the upper yoke 21 and the lower yoke 22 are each fixed to the upper and lower ends of the core column 1 by fastening fittings 9, and yoke fastening bolts 10 are distributed on the fastening fittings 9.

[0037] This invention provides a reactor comprising an oil-immersed core structure with a U-shaped yoke, as described above. The reactor core structure is improved by adding a wound U-shaped structure to the original laminated yoke. This causes the magnetic flux from the reactor core column 1 to flow into the yoke in a U-shaped stacked ring 4, avoiding right-angle entry that could cause localized overheating. This invention effectively absorbs leakage flux between the core column and the yoke end, solving the problem of localized overheating, and effectively preventing the heat generated by leakage flux entering the tank wall.

[0038] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An oil-immersed iron core structure employing a U-shaped iron yoke structure, characterized in that, include: Iron core column (1), the iron core column (1) is fitted with windings; The iron yoke (2) includes an upper iron yoke (21) and a lower iron yoke (22). The upper iron yoke (21) and the lower iron yoke (22) are respectively connected to the two ends of the iron core column (1) and cooperate with the iron core column (1) to form a closed magnetic circuit. The upper yoke (21) and the lower yoke (22) are stacked in a double U-shaped structure. The double U-shaped structure includes a first stacking edge (3). The two ends of the first stacking edge (3) extend along the opposite sides of the first stacking edge (3) to form two symmetrically arranged U-shaped stacking rings (4). The U-shaped stacking rings (4) are non-right-angled U-shapes. A second stacking edge (5) is provided between each U-shaped stacking ring (4) and the first stacking edge (3). An insulating plate (6) is provided between the second stacking edge (5) and the U-shaped stacking ring (4) and the first stacking edge (3).

2. The oil-immersed core structure with a U-shaped yoke structure according to claim 1, characterized in that, A first connecting through hole (11) is provided along the axial direction of the iron core column (1), and a second connecting through hole (31) is provided on the first stacked edge (3) to cooperate with the first connecting through hole (11).

3. The oil-immersed iron core structure with a U-shaped iron yoke structure according to claim 1, characterized in that, The U-shaped stacked ring (4) has U-shaped structures at both ends, and the U-shaped structures include an arc-shaped side (41) and two straight sides (42) connected to the arc-shaped side (41).

4. The oil-immersed core structure with a U-shaped yoke structure according to claim 3, characterized in that, A cavity (7) is formed between the U-shaped structure and the second stacked edge (5).

5. The oil-immersed core structure with a U-shaped yoke structure according to claim 3, characterized in that, The insulating plate (6) is respectively disposed between the second stacked edge (5) and the two straight edges (42).

6. The oil-immersed core structure with a U-shaped yoke structure according to claim 1, characterized in that, Three iron core columns (1) are arranged side by side between the upper iron yoke (21) and the lower iron yoke (22).

7. The oil-immersed core structure with a U-shaped yoke structure according to claim 1, characterized in that, A grounding wire (8) is connected to the upper yoke (21) and / or the lower yoke (22).

8. The oil-immersed core structure with a U-shaped yoke structure according to claim 1, characterized in that, It also includes fastening fittings (9), wherein the upper yoke (21) and the lower yoke (22) are respectively connected to the upper and lower ends of the core column (1) by fastening fittings (9).

9. An oil-immersed core structure employing a U-shaped yoke structure according to claim 8, characterized in that, The fastening fitting (9) is provided with yoke fastening bolts (10).

10. A reactor, characterized in that, Including the oil-immersed iron core structure with a U-shaped iron yoke structure as described in any one of claims 1-9.

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