Foil-wound dry-type air-core reactor

Abstract

The utility model relates to the field of air-core reactors, and discloses a foil-wound dry-type air-core reactor which comprises an epoxy cylinder, a plurality of coils are arranged on the outer side of the epoxy cylinder, each coil is of a winding structure from inside to outside, a plurality of I-shaped supporting strips are arranged on the inner side of each coil, each coil comprises a copper foil strip, and the copper foil strips are arranged on the outer side of the epoxy cylinder. The copper foil strips are wound from inside to outside, insulation paper is arranged between the wound copper foil strips, sliding grooves are formed in the outer wall, close to the coil, of the epoxy cylinder, fixing plates are arranged in the sliding grooves in a sliding mode, silica gel pads are arranged on one sides of the fixing plates, and the fixing plates abut against the inner side of the coil. According to the utility model, the I-shaped stays between the coils can ensure the heat dissipation of the coils during working, the coils are made of copper foil strips, so that the coils are easy to process, and the fixing plates enable the coils to be convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the field of air-core reactors, in particular to a foil-wound dry-type air-core reactor. Background Art

[0002] Air-core reactors are essential devices in power systems for limiting current, suppressing resonance, filtering out high-order harmonics, and improving power quality. These reactors are typically constructed from alternating layers of conductive foil and insulating material, forming a hollow inductor coil. Due to their structural characteristics, dry-type air-core reactors offer advantages such as compact size, light weight, excellent heat dissipation, and simple maintenance. Air-core reactors are widely used in household appliances, industrial production, and power systems.

[0003] Most existing air-core reactors are made of multi-strand copper wire, which is relatively hard, difficult to wind, and has poor heat dissipation. In addition, the coil mounting bracket of current air-core reactors is usually fixed with screws or glue. This makes disassembly and assembly of the reactor cumbersome during subsequent adjustment and maintenance, and physical disassembly and assembly may damage the paint film on the surface of the copper wire. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a foil-wound dry-type air-core reactor.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a foil-wound dry-type hollow reactor, comprising an epoxy cylinder, a plurality of coils are arranged on the outside of the epoxy cylinder, the coils are wound from the inside to the outside and a plurality of I-shaped struts are arranged on the inside, each of the coils comprises a copper foil strip, the copper foil strips are wound from the inside to the outside and insulating paper is arranged between the windings of the copper foil strips, the outer wall of the epoxy cylinder near the coil is provided with a slide groove, a fixed plate is slidably arranged in the slide groove, a silicone pad is provided on one side of the fixed plate, and the fixed plate abuts against the inner side of the coil;

[0006] Through the above technical solution, the I-shaped support bars between the coils can ensure the heat dissipation of the coils during operation. The use of copper foil strips makes the coils easy to process. Because this product uses multi-strand copper flat wire for low voltage and high current, the copper wire is relatively hard when winding, and the winding process is very difficult. Therefore, copper foil strips are selected as conductors instead of silicon steel sheets as magnetic cores, saving materials and working hours. The internal mold of this process uses 5mm epoxy cylinder material to facilitate the operation of the air-core reactor.

[0007] As a further description of the above technical solution:

[0008] The outer periphery of the coil is coated with adhesive tape, and the adhesive tape is coated on the outer side of the copper foil strip and the insulating paper;

[0009] Using the above technical solution, the inner tube is wrapped with three layers of NM insulating paper for insulation. First, the copper conductive busbar is welded with copper foil and then fixed with 3M tape. NM paper is used between layers for insulation, and two layers of I-beams are used in the middle as a heat sink. After all the turns are completed, another conductive busbar is welded and the outside is wrapped with three layers of NM paper. Because this product is used in three-phase circuits, three coils with the same inductance and the same process are used and wound on the internal mold.

[0010] As a further description of the above technical solution:

[0011] A first conductive bar is welded to one end of the copper foil strip, and a second conductive bar is welded to the other end of the copper foil strip;

[0012] Through the above technical solution, the first conductive bar and the second conductive bar are connected to the power supply to realize the power supply of the reactor. Different conductive bar connections make the air-core reactor have different functions.

[0013] As a further description of the above technical solution:

[0014] The end of the epoxy cylinder is provided with a mounting hole;

[0015] Through the above technical solution, the mounting hole enables the epoxy cylinder to be mounted on the electrical equipment in use.

[0016] As a further description of the above technical solution:

[0017] The four corners of the fixed plate away from the silicone pad are fixedly connected to connecting columns, and the connecting columns slide through the epoxy cylinder. The ends of the connecting columns away from the fixed plate are fixedly connected to trapezoidal blocks, and the side cross-section of the trapezoidal blocks is trapezoidal. The trapezoidal blocks are arranged in the limiting sleeve, and a wedge is arranged between the trapezoidal blocks and the limiting sleeve;

[0018] Through the above technical solution, the wedge block is set as a right-angled triangle, so that when the wedge block fixes the fixed plate, it can squeeze the limit sleeve against each other, so that the fixed plate can squeeze the coil through the silicone pad to fix the coil. When disassembling the coil, the wedge block is separated from between the trapezoidal block and the limit sleeve, and the wedge block is inserted between the trapezoidal block and the epoxy cylinder, so that the fixed plate is separated from the coil, and the coil and the epoxy cylinder can be separated. This mechanical extrusion and disassembly setting achieves the purpose of facilitating the disassembly and assembly of the reactor coil without damaging the copper foil strip.

[0019] As a further description of the above technical solution:

[0020] The limiting sleeve is fixedly connected to the inner wall of the epoxy cylinder;

[0021] Through the above technical solution, the limiting sleeve is used to position the trapezoidal block in combination with the wedge block.

[0022] The utility model has the following beneficial effects:

[0023] 1. In the present invention, the wedge block is set in a right-angled triangle shape, so that when the wedge block fixes the fixed plate, it can squeeze the limit sleeve against each other, so that the fixed plate squeezes the coil through the silicone pad to fix the coil. When removing the coil, the wedge block is separated from between the trapezoidal block and the limit sleeve, and the wedge block is inserted between the trapezoidal block and the epoxy cylinder to separate the fixed plate from the coil, so that the coil and the epoxy cylinder can be separated. This mechanical extrusion and disassembly setting achieves the purpose of facilitating the disassembly and assembly of the reactor coil without damaging the copper foil strip.

[0024] 2. In the present invention, the I-shaped support bars between the coils can ensure the heat dissipation of the coils during operation. The coils are made of copper foil strips, which makes the coils easy to process. Since this product uses multi-strand copper flat wires for low voltage and high current, the copper wires are relatively hard when wound, and the winding process is very difficult. Therefore, copper foil strips are selected as conductors instead of silicon steel sheets as magnetic cores, which saves materials and labor time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional diagram of a foil-wound dry-type air-core reactor proposed in the utility model;

[0026] Figure 2 This is a structural diagram of the coil of a foil-wound dry-type air-core reactor proposed in the utility model;

[0027] Figure 3 The utility model provides a cross-sectional schematic diagram of the epoxy cylinder and coil installation of a foil-wound dry-type air-core reactor.

[0028] Legend:

[0029] 1. Mounting hole; 2. Epoxy tube; 3. First conductive bar; 4. I-beam; 5. Second conductive bar; 6. Coil; 7. Insulation paper; 8. Copper foil strip; 9. Adhesive tape; 10. Limit sleeve; 11. Wedge; 12. Trapezoidal block; 13. Connecting column; 14. Silicone pad; 15. Fixing plate; 16. Slide groove. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections, indirect connections through an intermediate medium, or internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Reference Figure 1-3 The utility model provides an embodiment: a foil-wound dry-type hollow reactor, including an epoxy cylinder 2, a plurality of coils 6 are arranged on the outside of the epoxy cylinder 2, the coils 6 are wound from the inside to the outside and a plurality of I-shaped support bars 4 are arranged on the inside, each coil 6 includes a copper foil strip 8, the copper foil strip 8 is wound from the inside to the outside and an insulating paper 7 is arranged between the copper foil strips 8, the outer wall of the epoxy cylinder 2 near the coil 6 is provided with a slide groove 16, a fixed plate 15 is slidably arranged in the slide groove 16, and one side of the fixed plate 15 A silicone pad 14 is provided, and the fixing plate 15 is against the inner side of the coil 6. The I-shaped support bar 4 between the coils 6 can ensure the heat dissipation of the coils when working. The coils 6 are made of copper foil strips 8 to make the coils 6 easy to process. Because this product uses multi-strand copper flat wire for low voltage and high current, the copper wire is relatively hard when winding, and the winding process is very difficult. Therefore, the copper foil strips 8 are selected as conductors instead of silicon steel sheets as magnetic cores, which saves materials and working hours. The internal mold of this process uses 5mm epoxy cylinder 2 material to facilitate the operation of the air-core reactor;

[0033] Compared with oil-immersed reactors, foil-wound hollow reactors have an oil-free structure, so there will be no oil leakage problem, which improves the safety of operation;

[0034] The cylindrical structure with multiple layers of copper foil strips 8 connected in parallel is adopted, and ventilation air channels are formed between each package to help dissipate heat and reduce the hot spot temperature;

[0035] Since there is no iron core, foil wound air core reactor does not have the problem of ferromagnetic saturation, and the linearity of the inductance value is good, which is suitable for a variety of power system applications;

[0036] Windings are usually made of small-section round wires wound in parallel, which can significantly reduce eddy current loss and magnetic leakage loss. The air-core reactor has flexible installation methods and can be installed in three-phase vertical, triangular, or linear configurations, suitable for different system configurations.

[0037] Since no oil is used, air-core reactors are environmentally friendly, while also reducing fire protection requirements, capital investment, and maintenance costs.

[0038] The outer circumference of coil 6 is covered with tape 9, which is wrapped around the outside of copper foil strip 8 and insulating paper 7. The inner tube is wrapped with three layers of NM insulating paper 7 for insulation. First, the copper foil is welded to the copper conductive bar, and then fixed with 3M tape 9. NM paper is used between layers for insulation. Two layers of I-beams 4 are used in the middle as a heat sink. After all the turns are completed, another conductive bar is welded and the outside is wrapped with three layers of NM paper. Because this product is used for three-phase circuits, three coils with the same inductance and the same process are used and wound on the internal mold.

[0039] One end of the copper foil strip 8 is welded with a first conductive bar 3, and the other end of the copper foil strip 8 is welded with a second conductive bar 5. The first conductive bar 3 and the second conductive bar 5 are connected to a power supply to realize the power supply of the inductor. Different conductive bar connections make the air-core reactor have different functions.

[0040] The end of the epoxy tube 2 is provided with a mounting hole 1 , which allows the epoxy tube 2 to be mounted on the electrical equipment in use.

[0041] The four corners of the fixing plate 15 away from the silicone pad 14 are fixedly connected to the connecting posts 13, and the connecting posts 13 slide through the epoxy cylinder 2. The end of the connecting post 13 away from the fixing plate 15 is fixedly connected to the trapezoidal block 12. The side section of the trapezoidal block 12 is trapezoidal, and the trapezoidal block 12 is arranged in the limiting sleeve 10. A wedge 11 is arranged between the trapezoidal block 12 and the limiting sleeve 10. The wedge 11 is a right-angled triangle. When the wedge 11 fixes the fixing plate 15, it can squeeze against the limiting sleeve 10 to achieve the fixing of the coil 6 by squeezing the fixing plate 15 through the silicone pad 14. When the coil is removed, the wedge 11 is separated from the trapezoidal block 12 and the limiting sleeve 10, and the wedge 11 is inserted between the trapezoidal block 12 and the epoxy cylinder 2, so that the fixing plate 15 is separated from the coil 6, so that the coil and the epoxy cylinder 2 can be separated. Such a mechanical extrusion and disassembly arrangement realizes the purpose of facilitating the disassembly of the reactor coil without damaging the copper foil strip 8.

[0042] The limiting sleeve 10 is fixedly connected to the inner wall of the epoxy cylinder 2 , and the limiting sleeve 10 is used to position the trapezoidal block 12 in combination with the wedge block 11 .

[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A foil-wound dry-type hollow reactor, comprising an epoxy cylinder (2), characterized in that: A plurality of coils (6) are arranged on the outside of the epoxy cylinder (2), and the coils (6) are of a winding structure from the inside to the outside and a plurality of I-shaped struts (4) are arranged on the inside. Each of the coils (6) includes a copper foil strip (8), and the copper foil strip (8) is wound from the inside to the outside and insulating paper (7) is arranged between the windings of the copper foil strip (8). A sliding groove (16) is provided on the outer wall of the epoxy cylinder (2) near the coil (6), and a fixed plate (15) is slidably arranged in the sliding groove (16). A silicone pad (14) is provided on one side of the fixed plate (15), and the fixed plate (15) is pressed against the inner side of the coil (6).

2. The foil-wound dry-type air-core reactor according to claim 1, characterized in that: The outer periphery of the coil (6) is coated with an adhesive tape (9), and the adhesive tape (9) is coated on the outer sides of the copper foil strip (8) and the insulating paper (7).

3. The foil-wound dry-type air-core reactor according to claim 1, characterized in that: One end of the copper foil strip (8) is welded to a first conductive row (3), and the other end of the copper foil strip (8) is welded to a second conductive row (5).

4. The foil-wound dry-type air-core reactor according to claim 1, characterized in that: A mounting hole (1) is provided at the end of the epoxy cylinder (2).

5. The foil-wound dry-type air-core reactor according to claim 1, characterized in that: The four corners of the side of the fixed plate (15) away from the silicone pad (14) are fixedly connected with connecting columns (13), and the connecting columns (13) slide through the epoxy cylinder (2). The ends of the connecting columns (13) away from the fixed plate (15) are fixedly connected with trapezoidal blocks (12), and the side section of the trapezoidal blocks (12) is trapezoidal. The trapezoidal blocks (12) are arranged in the limiting sleeve (10), and a wedge block (11) is arranged between the trapezoidal blocks (12) and the limiting sleeve (10).

6. The foil-wound dry-type air-core reactor according to claim 5, characterized in that: The limiting sleeve (10) is fixedly connected to the inner wall of the epoxy cylinder (2).

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