The principle of the flame-proof type according to the concept of explosion-proof and fire-proof types of the European standard EN13463-1:2002, non-electrical equipment for explosive atmospheres part 1: basic methods and requirements, the flameproof type is one of the most commonly used types of flameproof that measures are taken to permit internal explosion and prevent flame propagation. Because this kind of explosion-proof type of lamp shell is generally made of metal materials, good heat dissipation, shell strength and good durability, very popular with users.
Moreover, many safety-increasing explosion-proof lamps and lanterns components, such as lamp holders, interlock switches and so on, also adopt explosion-proof structure. The electrical equipment with flameproof shell is called flameproof electrical equipment. If the explosive gas mixture enters the explosion-proof shell and is ignited, the explosion-proof shell can withstand the explosion pressure of the internal explosive gas mixture and prevent the internal explosion to spread to the explosive mixture around the shell. This is a kind of gap explosion-proof principle, that is, the use of metal gap can prevent the spread of the explosion flame and cooling the temperature of the explosion products, to achieve the flame extinguishment and cooling, to suppress the expansion of the explosion design of a structure.
It is suitable for the dangerous places in Zone 1 and zone 2 of explosive gas environment, Zone 20, Zone 21 and zone 22 of combustible dust environment, Zone IIA, IIB and IIC of explosive gas environment, Zone 20, Zone 21 and zone 22 of combustible dust environment Suitable for temperature group T 1-t 6 environment.
