Electromagnetic interference shielding device for distribution box

Abstract

The utility model belongs to electric box shielding technical field especially is a kind of power distribution box shielding protection device of anti-electromagnetic interference, including electric box, the front end of electric box is hinged with cabinet door by hinge, the bottom of electric box is fixedly connected with reinforcing seat, the sidewall of electric box is equipped with several ventilating grooves, the sidewall of electric box is equipped with several air flue, and heat dissipation fan is fixedly installed on the inner wall of electric box on air flue, the inner sidewall of electric box is fixedly connected with bracket.The utility model, electric box is composed of permalloy, plated copper honeycomb, aluminium sheet layer, inner wall is coated with epoxy resin paint, cabinet door is sealed with mechanical lock, bottom has "mouth" type reinforcing seat support, sidewall is equipped with ventilating groove, air flue and six different wind direction heat dissipation fan heat dissipation, rear sidewall incoming and outgoing line hole has gravity closure round cover, can prevent electromagnetic interference in full frequency band, give consideration to heat dissipation, dustproof and waterproof, structure is stable, and it is convenient to install maintenance.

Description

Technical Field

[0001] This utility model relates to the field of electrical box shielding technology, specifically to a shielding and protection device for electrical distribution boxes to prevent electromagnetic interference. Background Technology

[0002] In modern industrial automation and power systems, distribution boxes serve as the core hub of electrical equipment, and their operational stability directly impacts the safety of the entire system. However, with the widespread application of various electronic devices and communication technologies, electromagnetic interference (EMI) problems are becoming increasingly severe. Whether it's the low-frequency magnetic fields generated by inverters and motors in industrial environments, or the high-frequency electromagnetic waves from communication equipment and radio frequency devices, these can cause signal distortion, malfunctions, or even damage to precision components such as PLCs and sensors within the distribution box, seriously threatening the reliable operation of the power system. Existing distribution boxes have significant shortcomings in electromagnetic protection. Traditional single-material shielding layers are insufficient to suppress interference across the entire frequency band, and problems such as gap leakage and the conflict between heat dissipation and shielding are common. For example, ordinary metal enclosures have low shielding effectiveness against low-frequency magnetic fields, while simple ventilation openings for heat dissipation can lead to high-frequency electromagnetic wave leakage, making it difficult for the distribution box to operate stably in complex electromagnetic environments.

[0003] Meanwhile, fields with stringent electromagnetic environment requirements, such as medical and aerospace industries, have placed higher standards on the shielding performance of distribution boxes. Traditional protective devices, due to structural design flaws, cannot achieve efficient heat dissipation while ensuring shielding effectiveness, leading to excessive temperature rise during long-term operation and further exacerbating component aging and failure risks. Furthermore, existing technologies lack systematic solutions for electromagnetic leakage problems at cable entry / exit holes and cabinet door seams, making it difficult to meet the stringent electromagnetic compatibility requirements of modern industry.

[0004] Against this backdrop, developing a shielding protection device for distribution boxes to prevent electromagnetic interference is crucial for solving the electromagnetic compatibility problem in industrial power systems. This device needs to overcome the technical bottlenecks of traditional single-shielding structures, achieving synergistic suppression of low-frequency magnetic fields and high-frequency electromagnetic waves through material optimization and structural innovation. Simultaneously, it must resolve the conflict between heat dissipation and shielding, providing a safe and reliable operating environment for precision electrical components. Summary of the Invention

[0005] Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a shielding and protection device for distribution boxes to prevent electromagnetic interference, thus solving the problems mentioned in the background section.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0009] An electromagnetic interference shielding and protection device for a distribution box includes an electrical box. A cabinet door is hinged to the front end of the electrical box. A reinforcing base is fixedly connected to the bottom of the electrical box. Several ventilation slots and air ducts are provided on the side walls of the electrical box. A cooling fan is fixedly installed on the inner wall of the electrical box along the air ducts. A bracket is fixedly connected to the inner wall of the electrical box, and the bracket has an array of mounting holes for positioning and installing mounting strips. Each mounting strip has an array of mounting holes for installing electrical components. An inlet / outlet hole is provided on the rear wall of the electrical box, and a round cover is rotatably connected to the rear wall of the electrical box.

[0010] The electrical box consists of an inner layer of permalloy, a middle layer of copper-plated honeycomb, and an outer layer of aluminum plate, achieving the effect of preventing electromagnetic interference.

[0011] Furthermore, a mechanical lock is installed on the cabinet door to seal the opening and closing of the cabinet door and the electrical box.

[0012] Furthermore, the reinforcing seat is U-shaped and is used to support the electrical box.

[0013] Furthermore, a total of six cooling fans are provided, each with a different airflow direction.

[0014] Furthermore, the area of ​​the circular cover is larger than the area of ​​the inlet / outlet hole, and the circular cover covers the inlet / outlet hole. The rotation point of the circular cover is above the inlet / outlet hole, and the circular cover faces downward under the action of gravity.

[0015] Furthermore, the inner wall of the permalloy is coated with an epoxy resin coating.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a shielding and protection device for distribution boxes to prevent electromagnetic interference, which has the following beneficial effects:

[0018] This utility model's electrical box is constructed from layers of permalloy, copper-plated honeycomb, and aluminum plates. The inner wall is coated with epoxy resin, the cabinet door is sealed with a mechanical lock, and the bottom is supported by a "U"-shaped reinforcing seat. The side walls are equipped with ventilation slots, air ducts, and six cooling fans with different airflow directions. The rear side wall has gravity-closed round covers at the cable inlet and outlet holes, which can prevent electromagnetic interference across the entire frequency band, while also providing heat dissipation, dust and water protection. The structure is stable and easy to install and maintain. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the rear view structure of this utility model;

[0021] Figure 3This is a schematic diagram of the electrical box structure of this utility model.

[0022] In the diagram: 1. Electrical box; 2. Cabinet door; 3. Mechanical lock; 4. Reinforcing base; 5. Ventilation slot; 6. Air duct; 7. Cooling fan; 8. Bracket; 9. Mounting strip; 10. Cable inlet / outlet hole; 11. Round cover; 100. Permalloy; 200. Copper-plated honeycomb; 300. Aluminum plate; 400. Epoxy resin coating. Detailed Implementation

[0023] 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.

[0024] Example

[0025] like Figure 1-3 As shown in the figure, an embodiment of the present invention provides a shielding and protection device for a distribution box to prevent electromagnetic interference, including a power box 1, wherein the front end of the power box 1 is hinged to a cabinet door 2, which is sealed to the power box 1 for opening and closing.

[0026] The bottom of the electrical box 1 is fixedly connected to a reinforcing base 4 to support the electrical box 1 and enhance the stability of the device;

[0027] The side wall of the electrical box 1 is provided with a number of ventilation slots 5 and a number of air ducts 6. A cooling fan 7 is fixedly installed on the air duct 6 on the inner wall of the electrical box 1. The cooling fan 7 forms a heat dissipation system to exhaust the heat inside the electrical box 1, avoid overheating of the equipment due to shielding, and ensure the shielding effectiveness.

[0028] A bracket 8 is fixedly connected to the inner wall of the electrical box 1. The bracket 8 has multiple mounting holes arranged in an array. Mounting strips 9 are positioned and installed through the mounting holes. The mounting strips 9 have multiple mounting holes arranged in an array. Electrical components are installed through the mounting holes. This provides a stable installation structure, allowing electrical components to be installed in an orderly manner and to work stably in a shielded environment.

[0029] The electrical box 1 has a wire inlet / outlet hole 10 on its rear side wall, and a round cover 11 is rotatably connected to the rear side wall of the electrical box 1; under the action of gravity, it covers the wire inlet / outlet hole 10 downwards.

[0030] The electrical box 1 is composed of an inner layer of permalloy 100, a middle layer of copper-plated honeycomb 200, and an outer layer of aluminum plate 300, achieving the effect of electromagnetic interference prevention. The layered structure realizes full-band electromagnetic shielding. Permalloy 100 targets low-frequency magnetic fields, copper-plated honeycomb 200 suppresses high-frequency electromagnetic waves, aluminum plate 300 reflects external high-frequency interference, and epoxy resin coating 400 fills gaps and improves conductivity.

[0031] The working principle of the electromagnetic interference shielding device for the distribution box is as follows: The distribution box 1 consists of a layered shielding structure composed of an inner layer of permalloy 100, a middle layer of copper-plated honeycomb 200, and an outer layer of aluminum plate 300. The permalloy 100 utilizes its high magnetic permeability to provide magnetic shielding for low-frequency magnetic fields of 50Hz-1kHz. The copper-plated honeycomb 200 suppresses high-frequency electromagnetic waves of 1kHz-1GHz through waveguide cutoff and diffraction loss. The aluminum plate 300, combined with the surface tin foil, reflects external high-frequency interference. The epoxy resin coating 400 applied to the inner wall fills the gaps. The system enhances conductivity and overall shielding effectiveness; cabinet door 2 is sealed to electrical box 1 via mechanical lock 3, reducing electromagnetic leakage at seams; bottom reinforcing base 4 supports electrical box 1; side wall ventilation slots 5, air ducts 6, and cooling fans 7 constitute a heat dissipation system, expelling heat while ensuring shielding effectiveness; a round cover 11 at the rear side wall inlet / outlet hole 10 covers the outlet hole, with the rotation point at the top, closing downwards using gravity to reduce electromagnetic leakage from the outlet hole; brackets 8 and mounting strips 9 are used to install electrical components, ensuring their stable operation in the shielded environment.

[0032] like Figure 1 As shown, in some embodiments, a mechanical lock 3 is installed on the cabinet door 2, which seals the cabinet door 2 and the electrical box 1 for opening and closing; ensuring the shielding integrity of the electrical box 1, while the mechanical lock 3 also provides a mechanical fixing function for the cabinet door 2, ensuring the structural stability of the device during normal use.

[0033] like Figure 1 As shown, in some embodiments, the reinforcing base 4 is U-shaped and is used to support the electrical box 1; this structure can evenly distribute the weight of the electrical box 1, enhance the stability of the device when it is placed, and avoid tilting or shaking caused by the weight of the electrical box 1 itself or the installation of internal components.

[0034] like Figure 1 As shown, in some embodiments, a total of six cooling fans 7 are provided, with different airflow directions. The cooling fans 7 with different airflow directions can push air from the ventilation slots 5 and air ducts 6 into the electrical box 1, and after flowing through the electrical components, they are discharged from the top or the other side, avoiding airflow dead zones caused by a single airflow direction, improving heat dissipation efficiency, and ensuring that the temperature inside the box is controlled within a safe range.

[0035] like Figure 2As shown, in some embodiments, the area of ​​the round cover 11 is larger than the area of ​​the inlet / outlet hole 10, and the round cover 11 covers the inlet / outlet hole 10. The rotation point of the round cover 11 is above the inlet / outlet hole 10. Under the action of gravity, the round cover 11 is downward. The closed state under the action of gravity can prevent dust, water vapor and other substances from entering the electrical box 1, improve the protection level of the device, and protect the operating environment of electrical components.

[0036] like Figure 3 As shown, in some embodiments, the inner wall of the permalloy 100 is coated with an epoxy resin coating 400 to form an insulating coating of moderate thickness, with a layered shielding structure.

[0037] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electromagnetic interference shielding device for a power distribution box, comprising a box (1), characterized in that: The front end of the electrical box (1) is hinged to a cabinet door (2). The bottom of the electrical box (1) is fixedly connected to a reinforcing seat (4). The side wall of the electrical box (1) is provided with several ventilation slots (5). The side wall of the electrical box (1) is provided with several air ducts (6). A cooling fan (7) is fixedly installed on the air duct (6) on the inner wall of the electrical box (1). A bracket (8) is fixedly connected to the inner side wall of the electrical box (1). The bracket (8) is provided with multiple mounting holes in an array. The mounting strip (9) is positioned and installed through the mounting holes. The mounting strip (9) is provided with multiple mounting holes in an array. Electrical components are installed through the mounting holes. The rear side wall of the electrical box (1) is provided with inlet and outlet holes (10). A round cover (11) is rotatably connected to the rear side wall of the electrical box (1). The electrical box (1) is composed of an inner layer of permalloy (100), a middle layer of copper-plated honeycomb (200) and an outer layer of aluminum plate (300), which achieves the effect of preventing electromagnetic interference.

2. The electromagnetic interference shielding device for electrical distribution boxes of claim 1, wherein: A mechanical lock (3) is installed on the cabinet door (2), which seals the cabinet door (2) and the electrical box (1) for opening and closing.

3. The electromagnetic interference shielding device for electrical distribution boxes of claim 1, wherein: The reinforcing seat (4) is "U" shaped and is used to support the electrical box (1).

4. The electromagnetic interference shielding device for electrical enclosures of claim 1, wherein: There are six cooling fans (7) in total, and they are set in different directions.

5. The electromagnetic interference shielding and protection device for a distribution box according to claim 1, characterized in that: The area of ​​the round cover (11) is larger than the area of ​​the inlet / outlet hole (10), and the round cover (11) covers the inlet / outlet hole (10). The rotation point of the round cover (11) is above the inlet / outlet hole (10). Under the action of gravity, the round cover (11) is downward.

6. The electromagnetic interference shielding device for electrical boxes of claim 1, wherein: The inner wall of the permalloy (100) is coated with an epoxy resin coating (400).

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