1, different motor, blasting fan and the general blower motor is not the same, explosion-proof fan motor must be used explosion-proof fan. 2. Impeller is different in that the impeller material and impeller corresponding to the position of the shell wall material requirements, in case of friction, requirements do not produce sparks. For example, use aluminum blades and iron inner walls, or use iron blades and add aluminum to the inner walls 3. explosion-proof electric fans with different clearance between the Centrifugal impeller and the main engine box have low clearance limits, but the fans in order to require high efficiency usually limit the clearance, and they disagree with each other 4. The safety protection of the inlet and outlet side of different explosion-proof fans requires more stringent safety protection of the inlet and outlet side. The explosion-proof axial flow fan adopts the simplest structure of a fan with a motor directly connected with the impeller The complex structure of belt drive and long shaft drive is adopted to change the current axial fan for pumping oil in coal mine, which is beneficial to operation and maintenance. Methods of selecting explosion-proof Fans 1. Technical explosion-proof fans are used in places with high concentration of combustible gas and needing ventilation, such as underground coal mine and boiler room. The process requirement of explosion-proof Vortex blower, the start-up of the fan and the operation of the fan, the connection terminal of the motor, the fixed rotor and other parts of the spark and the external explosive gas contact, will not cause the safety accident. Rotating parts do not spark when they are rubbed against the housing under special conditions, which can lead to significant results due to combustible gases. Of course, the explosion-proof fan needs explosion-proof motor. 2, from the explosion-proof level, the domestic explosion-proof level is II, temporarily unable to Develop Class I. Class II refers to all the electrical equipment for explosive gas environment except coal mine and underground, which is equipped with motors in common blower. II is divided into IIA, IIB, IIC, IIB equipment can be used for IIA equipment conditions, IIC can be used for IIA, IIB conditions. Explosion-proof fans are EXDIIBT4, motor insulation Class F, the explosion protection standard conforms to the general requirements of GB3836.1-2000 something for electrical equipment used in an explosive gas environment part 1 and the requirements of GB3836.2-2000 something for electrical equipment used in an explosive gas environment part 2, Explosion Protection d something Also does not conform to the IEC60079-1 and European benchmark 3, the well-known brand explosion-proof fan motor is related to the safety of the staff and workers, proposed that consumers choose and buy big-brand goods, to ensure the quality of the products of big manufacturers, and good after-sales maintenance services, the machine and equipment production technology is high, the consumer may choose and buy with peace of mind. Matters needing attention in type selection of explosion-proof Fan 1. The type of fan must be determined according to the necessary air volume, wind dust and the type of fan selected. 2. In order to facilitate the connection and installation of the fan and the system piping, it is necessary to select the proper outlet direction and transmission mode of the fan. 3. When choosing explosion-proof Fan, it should meet the requirement of air volume and air pressure. When choosing, it should choose the fan with low noise as far as possible. 4. During procurement, machines and other enclosures shall be subject to internal inspection to prevent tool or miscellaneous items from remaining.

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