The concept of explosion-proof motors

An explosion-proof motor is a motor that can be used in flammable and explosive plants and does not generate sparks during operation.

Explosion-proof motors are mainly used in coal mines, oil and gas, petrochemical and chemical industries. In addition, they are also widely used in textile, metallurgy, city gas, transportation, grain and oil processing, papermaking, medicine and other sectors. As the main power equipment, explosion-proof motors are usually used to drive pumps, fans, compressors and other transmission machinery.

According to the explosion-proof principle, motors can be divided into flameproof motors/increased safety motors/positive pressure motors/spark-free motors/dust explosion-proof motors.

The basic principle of explosion-proof

(1) The concept of explosion

An explosion is a sudden change of a substance from one state to another through physical or chemical changes, and releases huge energy. The energy released at a rapid speed will cause the surrounding objects to suffer violent impact and damage. Three conditions must be met for an explosion:

①Explosive substances: substances that can react with oxygen (air), including gases, liquids and solids. (Gases: hydrogen, acetylene, methane, etc.; liquids: alcohol, gasoline; solids: dust, fiber dust, etc.

② Oxygen: air.

③ Ignition sources: including open flames, electrical sparks, mechanical sparks, static sparks, high temperatures, chemical reactions, light energy, etc.

(2) Reasons for explosion-proof considerations

① Explosive substances: Many production sites produce certain flammable substances. About two-thirds of underground coal mines have explosive substances; in the chemical industry, more than 80% of production workshops have explosive substances.

② Oxygen: Oxygen in the air is ubiquitous.

③ Ignition sources: In the production process, electrical instruments are used in large quantities, and various friction sparks, mechanical wear sparks, static sparks, high temperatures, etc. are inevitable, especially when instruments and electrical equipment fail.

Objectively, many industrial sites meet the conditions for explosions. When the concentration of the mixture of explosive substances and oxygen is within the explosion limit, if there is an explosion source, an explosion will occur. Therefore, it is necessary to take explosion-proof measures.

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