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It means that preventing explosions and preventing explosions must be considered from three necessary conditions, limiting one of the necessary conditions and limiting the explosion. Select the appropriate explosion-proof instrument and explosion-proof electrical equipment. The standard structures include flameproof, increased safety, positive pressure, sand-filled, intrinsically safe and oil-filled.
Explosion-proof is one of the explosion-proof forms. The explosion-proof explosion-proof type is to completely enclose the components of the equipment that can ignite the explosive gas mixture in a shell. The shell can withstand the flammability of the shell through any joint or structural gap of the shell. The mixture explodes internally without damage and does not cause ignition of the external explosive atmosphere formed by one or more gases or vapours.
Place parts that may generate sparks, arcs, and dangerous temperatures into a flameproof enclosure that isolates the interior of the equipment from the surrounding environment. There is a gap in the flameproof enclosure. Due to the respiration of the electrical equipment and the gas permeation, an explosive gas mixture may exist inside. When the explosion occurs, the enclosure can withstand the explosion pressure generated without damage, and at the same time, the gap of the shell structure can cool the flame and lower the flame. The speed of flame propagation or the acceleration of the chain is such that flame or dangerous flame products cannot ignite the external explosive atmosphere through the flameproof gap, thereby achieving the purpose of flameproof.
Flameproof type, explosion-proof electrical equipment structure, explosion-proof explosion-proof type is the equipment may ignite the explosive gas mixture components are all enclosed in a shell, the shell can withstand through the shell of any joint or structural gap, penetrate into The flammable mixture inside the enclosure is exploded inside without damage and does not ignite the external explosive atmosphere formed by one or more gases or vapours (see GB38362 standard).
The explosion-proof type “d†is classified into Type I and Type IIA, Type IIB, and Type IIC according to the types of explosive gas atmospheres it is allowed to use.
This type of explosion-proof equipment is suitable for use in places 1 and 2.
First understand what is explosion proof: