How explosion-proof lamps work

How explosion-proof lamps work

An explosion is a change from a state of matter, through physical or chemical changes, to a sudden change to another state and the release of enormous energy. The energy released at a rapid rate will subject the surrounding objects to violent impact and destruction.

The three conditions that an explosion must have:

1) Explosives: Substances that react with oxygen (air), including gases, liquids, and solids. (gas: hydrogen, acetylene, methane, etc.; liquid: alcohol, gasoline; solids: dust, fiber dust, etc.)

2) Oxygen: air.

3) Source of ignition: including open flame, electrical spark, mechanical spark, static spark, high temperature, chemical reaction, light energy, etc.

Why explosion proof

Explosives: Many production sites produce certain flammable substances. About two-thirds of the coal mine underground has explosives; in the chemical industry, more than 80% of the production workshops contain explosive substances. Oxygen: The oxygen in the air is ubiquitous. Ignition Source: The use of electrical instruments, various frictional sparks, mechanical wear sparks, static sparks, and high temperatures during the production process are unavoidable, especially when instrumentation or 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, an explosion will occur if there is an explosion source. Therefore, it is necessary to adopt explosion protection.

Principle introduction:

The explosion-proof type principle According to the explosion-proof concept and fire type of the European standard EN13463-1:2002 "Non-electrical equipment for explosive atmospheres Part 1: Basic methods and requirements", the flameproof type adopts measures to allow internal explosion and prevent flame propagation. An explosion-proof type is the most commonly used explosion-proof type. Since the explosion-proof type lamp housing is generally made of a metal material, the heat dissipation is good, the strength of the housing is high and the durability is good, and it is very popular with users. Moreover, many increased safety explosion-proof lighting components, such as lamp holders, interlock switches, etc., are also flameproof structures. An electrical device with a flameproof enclosure is called a flameproof electrical device. If the explosive gas mixture enters the flameproof enclosure and is ignited, the flameproof enclosure can withstand the explosive pressure of the internal explosive gas mixture and prevent the internal explosion from propagating to the explosive mixture around the enclosure. This is a kind of clearance explosion-proof principle, that is, a structure designed by using the metal gap to prevent the propagation of the explosion flame and cool down the temperature of the explosion product, achieve flame extinction and temperature reduction, and suppress the expansion of the explosion principle.

The concept of an explosion is the explosion of matter from one state, through physical or chemical changes, suddenly into another state, and the release of enormous energy. The energy released at a rapid rate will subject the surrounding objects to violent impact and destruction. The three conditions that an explosion must have:

1) Explosives: Substances that react with oxygen (air), including gases, liquids, and solids. (gas: hydrogen, acetylene, methane, etc.; liquid: alcohol, gasoline; solids: dust, fiber dust, etc.)

2) Oxygen: air.

3) Source of ignition: including open flame, electrical spark, mechanical spark, static spark, high temperature, chemical reaction, light energy, etc. Why Explosion-proof Explosives: Many production sites produce certain flammable substances. About two-thirds of the coal mine underground has explosives; in the chemical industry, more than 80% of the production workshops contain explosive substances. Oxygen: The oxygen in the air is ubiquitous. Ignition Source: The use of electrical instruments, various frictional sparks, mechanical wear sparks, static sparks, and high temperatures during the production process are unavoidable, especially when instrumentation or 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, an explosion will occur if there is an explosion source. Therefore, it is necessary to adopt explosion protection. The principle of explosion-proof instrument hazardous areas hazardous areas: explosive material area definition of China standard...