What are the key technologies and processes for electromagnetic shielding of industrial computer chassis?
Release Time : 2025-04-23
In industrial environments, electromagnetic interference is more complex, and the electromagnetic shielding performance of industrial computer cases is crucial. It not only protects the internal components of the computer from external electromagnetic interference, but also prevents the electromagnetic radiation generated by the computer itself from affecting other devices. The following are some key technologies and processes of industrial computer cases in electromagnetic shielding.
First, material selection is the basis of electromagnetic shielding. Industrial computer cases usually use metal materials with good conductivity, such as steel plates, aluminum alloys, etc. These metal materials can effectively reflect and absorb electromagnetic waves. Among them, steel plates have high electromagnetic shielding effectiveness and can well block low-frequency electromagnetic waves; while aluminum alloys have the advantages of light weight and corrosion resistance, and perform well in high-frequency electromagnetic shielding. In order to further improve the shielding performance, some chassis will also use metal composite materials or add electromagnetic shielding coatings on the surface.
Secondly, the structural design of the chassis plays a key role in electromagnetic shielding. Compared with the spliced structure, the chassis with an integral structure has better shielding performance because it reduces gaps and holes, thereby reducing the leakage path of electromagnetic waves. At the same time, the connection method between the cover plate, side plate and other components of the chassis is also very important. The use of conductive rubber strips, metal springs, etc. for sealing connections can effectively fill the gaps and prevent electromagnetic waves from leaking from the gaps.
Furthermore, electromagnetic shielding nets are one of the commonly used technical means. Installing electromagnetic shielding nets at the vents, heat dissipation holes and other locations of the chassis can block the propagation of electromagnetic waves while ensuring ventilation and heat dissipation. Electromagnetic shielding nets generally use metal wire mesh or metal woven mesh, and their mesh count and material will be selected according to different electromagnetic shielding requirements. The higher the mesh count, the better the shielding effect, but the ventilation performance may be affected to a certain extent, and a balance needs to be made between the two.
In addition, filtering technology is also an important part of electromagnetic shielding. By installing filters at the interfaces of the power cord, signal line and other interfaces of the chassis, the electromagnetic interference signal on the line can be effectively cut off to prevent it from being transmitted to the outside of the chassis or entering the inside of the chassis through the line. The selection of filters needs to be accurately matched according to different frequency ranges and interference intensities to achieve the best filtering effect.
In addition, grounding technology is also indispensable for electromagnetic shielding. Good grounding can timely guide the induced charge on the chassis into the earth, thereby reducing electromagnetic radiation. The grounding methods of the chassis usually include single-point grounding and multi-point grounding, which need to be reasonably selected according to the structure and electromagnetic environment of the chassis. At the same time, the impedance of the grounding line should be as low as possible to ensure the effectiveness of the grounding.
In terms of manufacturing process, the quality of the welding process directly affects the electromagnetic shielding performance of the chassis. The welding point should ensure good conductivity and sealing, avoid problems such as cold welding and leaking welding, so as to prevent electromagnetic waves from leaking from the welding gap. In addition, surface treatment processes such as electroplating and spraying can not only improve the corrosion resistance of the chassis, but also improve the conductivity of the chassis surface and enhance the electromagnetic shielding effect.
Industrial computer case involves multiple key links in electromagnetic shielding, such as material selection, structural design, shielding net application, filtering technology, grounding technology and manufacturing process. By comprehensively applying these technologies and processes, the electromagnetic shielding performance of industrial computer case can be effectively improved to ensure that industrial computers can operate stably and reliably in complex electromagnetic environments.