How to divide the explosion-proof level of explosion-proof motors, and what measures are used to achieve explosion-proof?

Compared with general-purpose motors, explosion-proof motors are motor products that belong to the scope of special equipment management. The state is managed according to production licenses, that is, the production and repair units of explosion-proof motors should have corresponding qualifications, otherwise they cannot carry out corresponding production and business activities.

Coal, petroleum, natural gas, chemical and other industrial sectors may, under certain conditions, cause explosion hazards due to the accumulation of gas, steam, air mixture or coal dust. Motor failures in such places, especially electrical failures, It is the source of explosion and fire. Therefore, motors used in places where detonating mixtures may accumulate must be made explosion-proof, and they are required to be safe during operation. In the coal industry, explosion-proof motors should be used in relevant equipment in mines where there is a danger of gas or coal dust explosion, whether it is the main process or the auxiliary process.

The particularity of explosion-proof motors is that there are flammable and explosive gas substances in their working conditions. According to different operating environments, they are divided into different types and explosion-proof grades.

Explosion-proof motors are explosion-proof electrical equipment, and explosion-proof electrical equipment is divided into two categories: I and II. Type I is electrical equipment used in coal mines; II is electrical equipment used in places other than mines, which are distinguished according to the maximum test safety clearance or the minimum ignition current. , Class II electrical equipment is divided into three categories: IIA, IIB, IIC.

According to their characteristics, explosion-proof motors are divided into explosion-proof motors, increased safety motors, positive pressure motors, non-sparking motors and dust explosion-proof motors.

The explosion-proof performance of the motor is guaranteed by special measures, which can prevent the explosion of the surrounding explosive medium, or reduce the possibility of explosion to a minimum. These measures are characterized by explosion protection classes and are divided into two categories. The first category of measures allows the explosion to occur inside the motor, but must not spread to the surrounding medium. The second category of measures is to take isolation measures between the conductive parts and the explosive medium, or to prevent dangerous sparks and local heating of conductive parts that may come into contact with the explosive mixture.