Magnetic shielding structure, transformer and transformer magnetic shielding method

Abstract

The invention discloses a magnetic shielding structure, a transformer and a transformer magnetic shielding method, and relates to the technical field of transformers. The shielding body comprises a reinforcing body and an insulating material, the gap of the reinforcing body is filled with the insulating material, the reinforcing body is coated with the insulating material to form an insulating layer, the insulating layer is used for blocking electric connection between the magnetic shielding structure and a shell of the transformer, and the reinforcing body is used for being electrically connected with a grounding body of the transformer. Compared with a traditional metal plate, the shielding body is formed by compositing the reinforcing body and the insulating material, the weight is lighter, the insulating performance is better, machining and forming are convenient, and the transportation cost and the manufacturing cost can be effectively reduced. Meanwhile, a complex structure can be realized, electromagnetic interference can be better shielded, and the overall performance is improved. The magnetic shielding structure is formed by compounding the reinforcing body and the insulating material, so that the magnetic shielding structure has good mechanical performance and can bear impact and vibration of external force, the service life is prolonged, and the stability and reliability of the magnetic shielding structure are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and more specifically, to a magnetic shielding structure, a transformer, and a transformer magnetic shielding method. Background Art

[0002] During transformer operation, magnetic leakage can have adverse effects, such as heating surrounding metal components and interfering with nearby electronic equipment. Therefore, magnetic shielding structures are crucial for transformers.

[0003] Traditional magnetic shielding structures typically utilize metal plates. While these plates offer some effectiveness in magnetic shielding, they also have numerous limitations. The high density of metal plates increases the overall weight of the transformer, making transportation and installation more difficult while also placing higher demands on the supporting structure. Furthermore, ensuring insulation from the surrounding area during installation is relatively difficult, and complex magnetic shielding structures are complex and expensive to manufacture.

[0004] Therefore, how to achieve lightweighting of the magnetic shielding structure while ensuring the stability and reliability of the magnetic shielding structure has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present application is to provide a magnetic shielding structure to achieve lightweight magnetic shielding structure while ensuring the stability and reliability of the magnetic shielding structure.

[0006] Another object of the present application is to provide a transformer having the above-mentioned magnetic shielding structure.

[0007] Another object of the present application is to provide a transformer magnetic shielding method using the above magnetic shielding structure.

[0008] To achieve the above objectives, this application provides the following technical solutions:

[0009] A magnetic shielding structure comprising:

[0010] The shielding body includes a reinforcement body and an insulating material. The insulating material fills the gaps in the reinforcement body and covers the reinforcement body to form an insulating layer. The insulating layer is used to block the electrical connection between the magnetic shielding structure and the transformer shell. The reinforcement body is used to be electrically connected to the grounding body of the transformer.

[0011] Optionally, in the above magnetic shielding structure, the reinforcement is made of long metal fibers.

[0012] Optionally, in the above magnetic shielding structure, the long metal fibers include one of steel fibers, aluminum fibers, copper fibers and nickel fibers.

[0013] Optionally, in the above magnetic shielding structure, the insulating material is a resin material.

[0014] Optionally, in the above magnetic shielding structure, the resin material includes one of epoxy resin, phenolic resin and polyurethane resin.

[0015] Optionally, in the above magnetic shielding structure, the shielding body comprises a cylindrical or rectangular shape.

[0016] A transformer comprises a magnetic shielding structure, wherein the magnetic shielding structure is the magnetic shielding structure as described in any one of the above items.

[0017] Optionally, the above transformer further includes a grounding body, which passes through the insulating layer of the shielding body and is connected and fixed to the reinforcement body.

[0018] A transformer magnetic shielding method, using the magnetic shielding structure as described in any one of the above items, comprises the following steps:

[0019] Prepare a shielding body, fill the gaps in the reinforcement with the insulating material and cover the reinforcement with the insulating material to form the insulating layer, and place the insulating material in a molding die for molding to obtain the shielding body;

[0020] Assemble the transformer, install the shielding body at the target position of the transformer, and pass the grounding body of the transformer through the insulating layer and connect and fix it to the reinforcement body.

[0021] Optionally, in the above transformer magnetic shielding method, in the step of preparing the shielding body, the shielding body is formed by a compression molding process or a vacuum adsorption process.

[0022] The magnetic shielding structure provided in this application electrically connects the reinforcement of the shielding body to the grounding body of the transformer, thereby achieving the magnetic conductivity of the magnetic shielding structure, thereby effectively shielding the magnetic field inside the transformer, reducing leakage flux, and improving transformer efficiency. At the same time, insulating material fills the gaps in the reinforcement and coats the reinforcement to form an insulating layer. This insulating layer ensures that the shielding body has good insulation performance, preventing short circuits between the magnetic shielding structure and structures such as the transformer housing, thereby improving the safety and reliability of the transformer. As can be seen from the above examples, the magnetic shielding structure provided in this application, which is formed by combining the reinforcement and insulating material to form the shielding body, is lighter and has better insulation performance than traditional metal plates. It is also easy to process and form, effectively reducing transportation and manufacturing costs. At the same time, it can realize complex structures, better shielding against electromagnetic interference, and improving overall performance. By combining the reinforcement and insulating material, the magnetic shielding structure can have good mechanical properties, can withstand external impact and vibration, extend its service life, and ensure the stability and reliability of the magnetic shielding structure.

[0023] The technical features mentioned above, the technical features described below, and the technical features shown individually in the accompanying drawings may be combined arbitrarily, as long as the combined technical features do not conflict with each other. All possible feature combinations are technical contents explicitly described in this document. Any of the multiple sub-features included in the same statement can be applied independently and does not necessarily have to be applied in conjunction with the other sub-features. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0025] Figure 1 A schematic structural diagram of a magnetic shielding structure provided in an embodiment of the present application;

[0026] Figure 2 This is a flow chart of the transformer magnetic shielding method provided in an embodiment of the present application.

[0027] Wherein, 100 is the shielding body, 10 is the reinforcement body, and 20 is the insulation layer. DETAILED DESCRIPTION

[0028] The core of this application is to provide a magnetic shielding structure to achieve lightweight magnetic shielding structure while ensuring the stability and reliability of the magnetic shielding structure.

[0029] Another core of the present application is to provide a transformer having the above-mentioned magnetic shielding structure.

[0030] Another core of the present application is to provide a transformer magnetic shielding method using the above-mentioned magnetic shielding structure.

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] Transformer magnetic leakage refers to the phenomenon that during the operation of the transformer, part of the magnetic flux fails to be effectively transmitted through the main magnetic circuit (i.e., the iron core), but instead forms a closed loop through the air or other non-ferromagnetic materials.

[0033] Magnetic flux leakage is an unavoidable physical phenomenon during transformer operation. However, excessive magnetic leakage can have adverse effects, such as heating surrounding metal components and interference with nearby electronic equipment. Measures such as optimizing magnetic circuit design, selecting high-permeability materials, reducing winding gaps, and adding magnetic shielding structures are commonly used to minimize magnetic leakage.

[0034] Traditional magnetic shielding structures typically utilize metal plates. While these plates offer some effectiveness in magnetic shielding, they also have numerous limitations. The high density of metal plates increases the overall weight of the transformer, making transportation and installation more difficult while also placing higher demands on the supporting structure. Furthermore, ensuring insulation from the surrounding area during installation is relatively difficult, and complex magnetic shielding structures are complex and expensive to manufacture.

[0035] For this reason, Figure 1 As shown, an embodiment of the present application discloses a magnetic shielding structure, including a shielding body 100. The shielding body 100 is formed by compounding a reinforcement body 10 and an insulating material. Compared to traditional metal plates, the shielding body 100 is lighter, has better insulation performance, is easier to process and form, and can effectively reduce transportation and manufacturing costs. At the same time, it can achieve a complex structure, better shield electromagnetic interference, and improve overall performance. The compounding of the reinforcement body 10 and the insulating material can give the magnetic shielding structure excellent mechanical properties, can withstand external impact and vibration, extend its service life, and ensure the stability and reliability of the magnetic shielding structure.

[0036] The following will be combined Figure 1 The magnetic shielding structure disclosed in the embodiments of the present application is specifically explained and illustrated.

[0037] The shield body 100 may include a reinforcement 10 and an insulating material. The reinforcement 10 may be electrically connected to the transformer's grounding body, enabling the magnetic conductivity of the magnetic shielding structure to effectively shield the transformer's internal magnetic field, reduce leakage flux, and improve transformer efficiency. The insulating material may fill the gaps in the reinforcement 10 and coat the reinforcement 10 to form an insulating layer 20. The insulating layer 20 blocks the electrical connection between the magnetic shielding structure and the transformer housing, ensuring that the shield body 100 has good insulation performance, preventing short circuits between the magnetic shielding structure and the transformer housing and other structures, and improving the safety and reliability of the transformer.

[0038] In some embodiments, as Figure 1As shown, the reinforcement 10 can be made of long metal fibers, wherein the long metal fibers can be, but are not limited to, one of steel fibers, aluminum fibers, copper fibers, and nickel fibers. Preferably, the long metal fibers are steel fibers, thereby improving the mechanical strength of the magnetic shielding structure, making it more resistant to impact and vibration, and extending its service life. At the same time, the reinforcement 10 made of steel fibers can help to quickly conduct heat inside the transformer, reduce temperature rise, improve operating efficiency and stability, and reduce external electromagnetic interference, thereby improving the transformer's anti-interference ability. In addition, steel fibers can effectively suppress eddy currents, reduce energy loss, improve the energy efficiency of the transformer, and help achieve a more compact and lightweight transformer structure.

[0039] In some embodiments, as Figure 1 As shown, the insulating material can be a resin material, wherein the resin material can be one of, but not limited to, epoxy resin, phenolic resin, and polyurethane resin. By distributing the reinforcement 10 made of long metal fibers in a complex manner within the resin matrix, the leakage magnetic field can be effectively scattered and absorbed, achieving a better magnetic shielding effect than traditional metal plates. The resin matrix not only provides insulation protection but also prevents the long metal fibers from being corroded by the external environment, thereby ensuring the long-term stability of the material. Preferably, the resin material can be epoxy resin. Epoxy resin has high dielectric strength and low dielectric loss, which can effectively isolate current, prevent short circuits and leakage, and ensure the safe operation of the transformer. At the same time, after curing, epoxy resin has high mechanical strength, can withstand the mechanical stress and vibration of the transformer, and extend the life of the equipment. Epoxy resin is resistant to a variety of chemical substances and can prevent the reinforcement 10 of the shielding body 100 from damage due to chemical corrosion.

[0040] In some embodiments, as Figure 1 As shown, the shielding body 100 can adopt a rectangular structure, and of course can also adopt other complex shapes such as a cylindrical structure, and the thickness of the shielding body 100 can be adjusted according to the power and operating frequency of the transformer to achieve the best magnetic shielding effect.

[0041] The magnetic shielding structure disclosed in the embodiments of this application utilizes a reinforcement 10 of the shielding body 100 to electrically connect to the transformer's grounding body, thereby enhancing the magnetic conductivity of the magnetic shielding structure. This effectively shields the magnetic field within the transformer, reduces magnetic flux leakage, and improves transformer efficiency. Furthermore, insulating material fills the gaps within the reinforcement 100 and forms an insulating layer 20 on the outside of the reinforcement 10. This insulating layer 20 ensures that the shielding body 100 has good insulation performance, preventing short circuits between the magnetic shielding structure and structures such as the transformer housing, thereby improving the safety and reliability of the transformer.

[0042] The magnetic shielding structure disclosed in the embodiment of the present application is a shielding body 100 formed by compounding a reinforcement body 10 and an insulating material. Compared with traditional metal plates, it is lighter in weight, has better insulation performance, and is easy to process and form, which can effectively reduce transportation costs and manufacturing costs. At the same time, it can realize complex structures, better shield electromagnetic interference, and improve overall performance. The reinforcing effect of the reinforcement body 10 makes the magnetic shielding structure have good mechanical properties, can withstand external force impact and vibration, extend the service life, and ensure the stability and reliability of the magnetic shielding structure. Due to the skin effect of the induced potential and the increase in the surface area of the metal long fiber structure, the magnetic shielding structure prepared by using a metal long fiber resin composite material can greatly reduce the overall weight of the transformer, solving the strict weight restrictions during transportation and installation. Under harsh environmental conditions, the corrosion resistance and insulation of the metal long fiber resin composite material extend the service life of the transformer and reduce the maintenance frequency. In addition, the metal long fiber resin composite material used to prepare the magnetic shielding structure can be manufactured through mature processes, which improves production efficiency and reduces manufacturing costs.

[0043] An embodiment of the present application further discloses a transformer, including a magnetic shielding structure, and the magnetic shielding structure adopts the magnetic shielding structure disclosed in the above embodiment, so it has all the technical effects of the above magnetic shielding structure, which will not be repeated here.

[0044] Among them, the transformer may also include a grounding body, and the grounding body can pass through the insulating layer 20 of the shielding body 100 and be connected and fixed to the reinforcement body 10, so as to realize the magnetic conductivity of the magnetic shielding structure, thereby effectively shielding the magnetic field inside the transformer, reducing leakage magnetic flux, and improving transformer efficiency.

[0045] like Figure 2 As shown, the present application also discloses a transformer magnetic shielding method, which uses the magnetic shielding structure disclosed in the above embodiment and thus has all the technical effects of the above magnetic shielding structure. This article will not repeat them here. The transformer magnetic shielding method includes step S100 of preparing a shielding body and step S200 of assembling a transformer.

[0046] Step S100, preparing a shielding body;

[0047] The insulating material is filled into the voids of the reinforcement 10 and coated on the reinforcement 10 to form an insulating layer 20, and is placed in a molding mold for molding to obtain the shielding body 100. Specifically, the treated long steel fibers are impregnated into a resin matrix and placed into a specific mold for molding, so that the resin material is solidified, and finally the shielding body 100 made of a steel fiber resin composite material of the desired shape and size is obtained. It should be noted that after the treated long steel fibers are impregnated into a resin matrix and placed into a specific mold, a compression molding process can be adopted, but is not limited to, that is, maintaining a certain pressure and temperature for an appropriate time to form the shielding body 100. Of course, other molding processes such as vacuum adsorption process can also be used to prepare the shielding body 100, which is not limited herein.

[0048] Step S200, assembling a transformer;

[0049] The shielding body 100 is installed at the target location of the transformer, i.e., the location where magnetic shielding is required, and its relative position with the core, winding, and other components is ensured to be accurate. Meanwhile, the grounding body is connected and fixed to the reinforcement body 10 by passing through the insulating layer 20. Other conventional assembly steps are then completed to bring the transformer into an operational state. It should be noted that in actual applications, parameters such as the content and diameter of the long metal fibers and the type of resin matrix can be flexibly adjusted according to the transformer specifications, operating environment, and magnetic shielding requirements to achieve optimal magnetic shielding performance and a balance of overall performance.

[0050] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0051] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0052] Unless otherwise specified or limited, the terms "connected" and "connection" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0053] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A magnetic shielding structure, characterized in that: include: A shielding body (100) comprising a reinforcement body (10) and an insulating material, wherein the insulating material is filled in a gap in the reinforcement body (10) and coated on the reinforcement body (10) to form an insulating layer (20), wherein the insulating layer (20) is used to block the electrical connection between the magnetic shielding structure and the shell of the transformer, and the reinforcement body (10) is used to be electrically connected to the grounding body of the transformer.

2. The magnetic shielding structure according to claim 1, wherein: The reinforcement (10) is made of long metal fibers.

3. The magnetic shielding structure according to claim 2, wherein: The long metal fibers include one of steel fibers, aluminum fibers, copper fibers and nickel fibers.

4. The magnetic shielding structure according to claim 1, wherein: The insulating material is a resin material.

5. The magnetic shielding structure according to claim 4, characterized in that: The resin material includes one of epoxy resin, phenolic resin and polyurethane resin.

6. The magnetic shielding structure according to any one of claims 1 to 5, characterized in that: The shielding body (100) comprises a cylindrical or rectangular shape.

7. A transformer, characterized in that: It comprises a magnetic shielding structure, wherein the magnetic shielding structure is the magnetic shielding structure according to any one of claims 1 to 6.

8. The transformer according to claim 7, characterized in that It also includes a grounding body, which passes through the insulating layer (20) of the shielding body (100) and is connected and fixed to the reinforcement body (10).

9. A transformer magnetic shielding method, using the magnetic shielding structure according to any one of claims 1 to 6, characterized in that: Including steps: Prepare a shielding body, fill the gaps of the reinforcement (10) with the insulating material and coat the reinforcement (10) with the insulating material to form the insulating layer (20), and place the insulating material in a molding die for molding to obtain the shielding body (100); Assembling the transformer, installing the shielding body (100) at a target position of the transformer, and passing the grounding body of the transformer through the insulating layer (20) and connecting and fixing it to the reinforcement body (10).

10. The transformer magnetic shielding method according to claim 9, characterized in that: In the step of preparing the shielding body, a compression molding process or a vacuum adsorption process is adopted to form the shielding body (100).

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