The explosion-proof in the PLC control cabinet is achieved by using a flameproof enclosure. The principle of this explosion-proof is mainly to place the live parts of the electrical equipment in a special enclosure, which can effectively isolate the sparks generated by the electrical parts inside the enclosure from the explosive mixture outside the enclosure, and can also withstand the explosion pressure generated when the sparks of the electrical equipment inside the enclosure are ignited, and the enclosure itself will not be damaged. In addition, this enclosure can also prevent the explosion products inside the shell from spreading to the explosive mixture outside the shell, thereby avoiding the ignition or explosion of the explosive mixture outside the shell. This kind of electrical equipment with a flameproof enclosure is called “flameproof electrical equipment” and is widely used in places where flammable gases and steam exist, such as underground coal mines and other explosive environment workplaces.
Specifically, the explosion-proof design of the PLC control cabinet takes the following points into consideration:
Explosion-proof principle: By using a flameproof enclosure to isolate the sparks generated by electrical components from the explosive environment that may exist outside.
Explosion-resistant function: The enclosure can withstand the pressure generated by the internal explosion without being destroyed, preventing the internal explosive from spreading to the outside.
Heat dissipation design: While considering explosion-proof, it is also necessary to solve the heat dissipation problem of electrical components. Usually, heat dissipation holes are reserved on the explosion-proof cabinet, and explosion-proof pipes are used to lead out of the non-explosion-proof area to ensure the normal operation and safe use of the equipment.
In addition, according to different application environments and requirements, PLC control cabinets can also adopt other explosion-proof levels and technologies, such as increased safety, positive pressure, intrinsic safety, etc., to ensure safety and reliability in different hazardous environments.
