Explosion is the sudden change of substances from one state to another through physical or chemical changes, and the release of huge energy. The energy released by the rapid speed will make the surrounding objects suffer violent impact and damage.
Three conditions for explosion:
1) Explosive substances: substances that can react with oxygen (air), including gas, liquid and solid. (gas: hydrogen, acetylene, methane, etc.; liquid: alcohol, gasoline; solid: dust, fiber dust, etc.)
2) Oxygen: air.
3) Ignition source: including open fire, electrical spark, mechanical spark, electrostatic spark, high temperature, chemical reaction, light energy, etc.
Why explosion-proof
Explosive substances: some combustible substances will be produced in many production sites. Explosive substances exist in about two-thirds of the places under the coal mine; In the chemical industry, explosive substances exist in more than 80% of the production workshop area. Oxygen: oxygen in the air is everywhere. Ignition source: electrical instruments are widely used in the production process, and various kinds of friction sparks, mechanical wear sparks, electrostatic sparks, high temperatures, etc. are inevitable, especially when instruments and electrical faults occur. Objectively, many industrial sites meet the explosion conditions. When the mixed concentration of explosive substances and oxygen is within the explosion limit, explosion will occur if there is an explosion source. Therefore, it is necessary to take explosion-proof measures.
Detailed introduction of principle:
The principle of flameproof type is based on the explosion-proof concept and fire-proof type in the European standard en13463-1:2002 non electrical equipment for explosive atmospheres Part 1: basic methods and requirements. Flameproof type is an explosion-proof type that takes measures to allow internal explosion and prevent flame propagation. It is the most commonly used explosion-proof type. As the shell of this explosion-proof type of lamp is generally made of metal materials, it has good heat dissipation, high strength and durability, and is very popular with users. In addition, many increased safety explosion-proof lamp parts, such as lamp holders, interlock switches, etc., also adopt flameproof structure. Electrical equipment with flameproof enclosure is called flameproof electrical equipment. If the explosive gas mixture enters the flameproof enclosure and is ignited, the flameproof enclosure can withstand the explosion pressure of the explosive gas mixture inside and prevent the internal explosion from propagating to the explosive mixture around the enclosure. This is a gap explosion-proof principle, that is, a structure designed based on the principle that metal gaps can prevent the propagation of explosion flames and cool the temperature of explosion products, so as to extinguish and cool the flames and inhibit the expansion of explosions.
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