Coil insulation structure of transformer for microwave oven, air conditioner and electric reactor for household electrical appliance

Abstract

The utility model relates to the field of enameled coils, and discloses a coil insulation structure of transformers for microwave ovens, air conditioners and electric reactors for household appliances, which comprises insulation paper positioned outside the enameled coils, the insulation paper wraps the enameled coils and is wound on the enameled coils, and the insulation paper is mica paper and polyester films or aramid paper for electrical insulation. The polyester film or the aramid paper for electrical insulation is compounded on the surface of the mica paper, or the insulation paper is a mixture of the mica paper and the aramid paper, and the insulation paper completely wraps the length direction or the short side direction of the enameled coil or the enameled coil in the length direction or the short side direction of the enameled coil. According to the technical scheme, the overall plasticity, flexibility and voltage resistance of the enameled coil can be improved, the voltage resistance value can be increased to 1.5 times or above of the original voltage resistance value, the corona phenomenon is prevented from occurring in the using process, and the overall service life of the transformer reactor is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of enameled coils, specifically a coil insulation structure for transformers used in microwave ovens, air conditioners, and reactors used in household appliances. Background Technology

[0002] Traditionally, transformers for microwave ovens, and reactors for air conditioners, washing machines, and refrigerators use mica paper as their coil. A thin film needs to be placed inside the mica paper, which requires two processes. This not only results in low efficiency but also a relatively low withstand voltage. Under high voltage conditions, corona discharge can easily occur, causing defects in the mica paper, damaging it, and leading to short circuits. In addition, the overall cost is relatively high.

[0003] Document CN201921866077 discloses insulating paper for reactors or transformers, a reactor, and a transformer, including: a limiting portion for covering the outer periphery of the coil, and a limiting portion extending radially inward and / or outward from the end of the outer periphery toward the inner and / or outer side of the coil, the limiting portion being used to limit the insulating paper. The reactor or transformer includes a mounting base, an iron core, a coil assembled on the iron core, and insulating paper insulating the iron core from the coil, the iron core being fixed on the mounting base; the insulating paper is the type used for reactors or transformers. This type of insulating paper, with only one layer during installation, has poor voltage withstand performance, is prone to corona discharge, causing short circuits and reducing the service life of the reactor or transformer.

[0004] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned issues, this utility model discloses a coil insulation structure for transformers used in microwave ovens, air conditioners, and reactors used in household appliances. This structure increases the overall plasticity, flexibility, and voltage resistance of the enameled coil, raising the voltage resistance value to more than 1.5 times the original value. It also prevents corona discharge during use and extends the overall service life of the transformer and reactor.

[0006] The technical solution of this utility model is: the coil insulation structure of transformers for microwave ovens, air conditioners and reactors for household appliances, including insulating paper located outside the enameled coil, insulating paper wrapped around the enameled coil, the insulating paper being mica paper and electrical insulation polyester film or aramid paper, the electrical insulation polyester film or aramid paper being laminated on the surface of the mica paper, or the insulating paper being a mixture of mica paper and aramid paper.

[0007] The insulating paper completely covers the enameled coil.

[0008] Insulating paper is wrapped around the enameled coil along its length or short side.

[0009] By adopting the above technical solutions, using mica paper and electrical insulation polyester film or aramid paper, or directly using DuPont 418, the overall withstand voltage of the reactor and transformer can be increased by 1.5 times.

[0010] Preferably, the insulating paper includes a vertical portion and a horizontal portion, which are perpendicular to each other on the enameled coil. The ends of the vertical and horizontal portions are located at the junction of the length and width directions of the enameled coil, and the vertical and horizontal portions of the insulating paper form a square shape.

[0011] Preferably, the portion of the vertical part located inside the enameled coil also includes an outer vertical part and an inner overlapping part, with the inner overlapping part located outside the horizontal part and folded inward.

[0012] By adopting the above technical solution, the inner overlapping part is overlapped together inside the enameled coil, thus avoiding the coil inside the enameled coil being exposed to the outside.

[0013] Preferably, the sum of the widths of the inner overlapping portions is greater than the width of the vertical portion.

[0014] By adopting the above technical solution, when the inner overlapping parts are overlapped, the inner side of the enameled coil is easily concealed within the inner overlapping part, preventing part of the enameled coil from being exposed to the outside.

[0015] Preferably, the vertical part, the horizontal part, and the inner overlapping part are connected by creases, and the vertical part, the horizontal part, and the inner overlapping part are integrally attached to the enameled coil.

[0016] By adopting the above technical solution, the enameled coil is completely covered in insulating paper along its length.

[0017] Preferably, the inner overlapping portion is located inside the enameled coil, and the inner overlapping portions are connected by tape.

[0018] By adopting the above technical solution, the inner overlapping parts are glued together with tape to prevent the insulating paper from coming apart during use and to prevent the length of the enameled coil from being exposed.

[0019] Preferably, the enameled coil has two terminals leading out from the short side, and the end of the enameled coil passes through the insulating paper and connects to the terminals.

[0020] Preferably, the mixture is a sheet-like insulating paper formed by mixing mica paper and aramid paper together at the time of manufacture.

[0021] The advantages of this utility model are: 1. By completely wrapping the enameled coil with insulating paper along its length or short side, the insulating paper has greater structural plasticity, which increases the overall withstand voltage of the enameled coil by 1.5 times that of the traditional method.

[0022] 2. The structure of this utility model using mica paper composite film or aramid paper, or the insulating paper is a mixture of mica paper and aramid paper, is non-toxic and harmless, has stronger fire resistance, can also prevent leakage and short circuit, prevent corona discharge, improve the overall performance of the enameled coil, and has higher heat dissipation and less environmental pollution.

[0023] 3. This utility model effectively improves the overall pressure resistance, reduces manufacturing costs, has greater plasticity and flexibility, and effectively extends service life. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the transformer assembly of this utility model;

[0025] Figure 2 This is a schematic diagram of the assembly structure of the reactor of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the insulating paper of this utility model;

[0028] Figure 5 This utility model Figure 2 A structural schematic diagram of enlarged view of part A in the middle;

[0029] Figure 6 This is a schematic diagram of the unfolded structure of the insulating paper of this utility model.

[0030] Figure 7 This is a schematic diagram of the structure of the present invention, in which insulating paper is fully wrapped around an enameled coil.

[0031] Among them: 1. Enamelled coil, 2. Insulating paper, 201. Horizontal part, 202. Vertical part, 2021. Inner overlapping part, 3. Mica paper, 4. Film or aramid paper, 5. Primary coil, 6. Secondary coil, 7. Reactor. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0033] like Figure 1-7As shown, the coil insulation structure of transformers for microwave ovens, air conditioners, and reactors for household appliances includes insulating paper 2 located outside the enameled coil 1. The insulating paper 2 is wrapped around the enameled coil 1. The insulating paper 2 is mica paper 3 and electrical insulation polyester film or aramid paper. Electrical insulation polyester film or aramid paper 4 is laminated on the surface of mica paper 3, or the insulating paper is a mixture of mica paper and aramid paper. The mixture is a sheet-like insulating paper 2 formed by mixing mica paper 3 and aramid paper 4 together at the factory. The insulating paper 2 completely covers the length or short side of the enameled coil 1. By using mica paper 3 and electrical insulation polyester film or aramid paper 4, or directly using DuPont 418, or directly using mica paper, the overall withstand voltage value of the reactor and transformer can be increased by 1.5 times.

[0034] The insulating paper 2 completely covers the enameled coil 1.

[0035] Insulating paper 2 is wrapped around the enameled coil 1 along its length or short side. Example 1

[0036] This type of insulating paper is used for reactor 4 or the primary coil 6 of transformer.

[0037] The insulating paper 2 includes a vertical portion 202 and a horizontal portion 201, which are perpendicular to each other on the enameled coil 1. The ends of the vertical portion 202 and the horizontal portion 201 are located at the junction of the length and width directions of the enameled coil 1, forming a U-shape between the vertical portion 202 and the horizontal portion 201 of the insulating paper 2. The portion of the vertical portion 202 located inside the enameled coil 1 also includes an outer vertical portion 202 and an inner overlapping portion 2021. The inner overlapping portion 2021 is located outside the horizontal portion 201 and is folded inward. The inner overlapping portion 2021 is overlapped together inside the enameled coil 1 to prevent the inner coil of the enameled coil 1 from being exposed.

[0038] The sum of the widths of the inner overlapping portions 2021 is greater than the width of the vertical portion 202. When the inner overlapping portions 2021 are overlapped, the inner side of the enameled coil 1 is completely concealed within the inner overlapping portions 2021, preventing part of the enameled coil 1 from being exposed to the outside.

[0039] The vertical part 202, the horizontal part 2021 and the inner overlapping part 2021 are connected by creases. The vertical part 202, the horizontal part 201 and the inner overlapping part 2021 are attached to the enameled coil 1 as a whole, and the length direction of the enameled coil 1 is completely covered in the insulating paper 2.

[0040] The inner overlapping part 2021 is located inside the enameled coil 1. The inner overlapping parts 2021 are connected by tape. The tape is used to stick the inner overlapping parts 2021 together to prevent the insulating paper 2 from coming apart during use and to prevent the length of the enameled coil 1 from being exposed.

[0041] Two terminals are led out from the short side of the enameled coil 1, and the end of the enameled coil 1 passes through the insulating paper and connects to the terminals.

[0042] Wrapping the insulating paper 2 around the enameled coil along its length or short side, and then taping the inner overlapping parts together, prevents the enameled coil 1 from being exposed. This also improves the overall plasticity, flexibility, and voltage resistance of the enameled coil, preventing corona discharge from easily occurring. Example 2

[0043] This type of insulating paper is used for the secondary coil 5 of the transformer.

[0044] When the insulating paper completely covers the enameled coil 1, the short side of the enameled coil 1 is completely covered by the insulating paper, and the portion of the insulating paper located on the upper and inner sides of the short side has an opening. Alternatively, the long side of the enameled coil 1 is completely covered by the insulating paper, and the portion of the insulating paper located on the upper and inner sides of the long side has an opening, which facilitates the inward bending of the insulating paper. The remaining folding methods are the same as when the insulating paper 2 covers the enameled coil 1 in the long or short side direction. Example 3

[0045] This type of insulating paper 2 is used for the secondary coil 5 of the transformer.

[0046] On the long or short side of the enameled coil 1 covered by insulating paper 2, the insulating paper 2 is in the shape of two inverted U-shapes, overlapping each other. The openings of the two inverted U-shapes of insulating paper 2 are arranged opposite to each other, so that the long or short side is completely covered inside. Figure 1 The shape on the left side of the secondary coil 5.

[0047] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. The coil insulation structure of transformers for microwave ovens, reactors for air conditioners and household appliances, including insulating paper located outside the enameled coil, characterized in that: The insulating paper is wrapped around the enameled coil. The insulating paper is mica paper and electrical insulation polyester film or aramid paper. The electrical insulation polyester film or aramid paper is laminated on the surface of the mica paper, or the insulating paper is a mixture of mica paper and aramid paper.

2. The coil insulation structure of the microwave oven transformer, air conditioner, and household appliance reactor according to claim 1, characterized in that: The insulating paper completely covers the enameled coil.

3. The coil insulation structure of the microwave oven transformer, air conditioner, and household appliance reactor according to claim 1, characterized in that: The insulating paper is wrapped around the enameled coil along its length or short side.

4. The coil insulation structure of the microwave oven transformer, air conditioner, and household appliance reactor according to claim 3, characterized in that: The insulating paper includes a vertical portion and a horizontal portion. The ends of the vertical portion and the horizontal portion are located at the intersection of the length direction and the width direction of the enameled coil. The vertical portion and the horizontal portion are perpendicular to each other on the enameled coil. The vertical portion and the horizontal portion of the insulating paper form a square shape.

5. The coil insulation structure for microwave oven transformers, air conditioners, and household appliance reactors according to claim 4, characterized in that: The vertical portion located inside the enameled coil also includes an outer vertical portion and an inner overlapping portion. The inner overlapping portion is located outside the horizontal portion and is folded inward. The sum of the widths of the inner overlapping portions is greater than the width of the vertical portion.

6. The coil insulation structure for microwave oven transformers, air conditioners, and household appliance reactors according to claim 5, characterized in that: The vertical part, the horizontal part, and the inner overlapping part are connected by creases, and the vertical part, the horizontal part, and the inner overlapping part are integrally attached to the enameled coil.

7. The coil insulation structure for microwave oven transformers, air conditioners, and household appliance reactors according to claim 6, characterized in that: The inner overlapping portion is located inside the enameled coil, and the inner overlapping portions are connected by tape.

8. The coil insulation structure of the transformer for microwave ovens, air conditioners, and reactors for household appliances according to claim 1, characterized in that: The enameled coil has two terminals extending from its short side, and the end of the enameled coil passes through the insulating paper and connects to the terminals.

9. The coil insulation structure of the transformer for microwave ovens, air conditioners, and reactors for household appliances according to claim 1, characterized in that: The mixture is a sheet-like insulating paper formed by mixing mica paper and aramid paper together during the manufacturing process.

Images