It is mainly used for ventilating and conveying air and other gases which are non-spontaneous combustion, non-explosive, non-volatile, non-harmful to human body and non-corrosive to steel in general factories and large buildings. However, the conveying gas shall not contain viscous substances, dust and hard particles not more than 150 mg/m3, and the gas temperature shall not exceed 80 ° C. Type 4-72 centrifugal fan is the earliest fan used in our country, but it is also the most common fan used, from high-rise buildings to subway, from boiler blast to factory ventilation, from the northern border to the coast of the South China Sea, it can be seen from the western plateau to the eastern border. From one end of the motor to face, where the impeller according to the clockwise direction rotating are known as “Right”, said “Right”, otherwise known as “Left-cyclone”, said to the left. The outlet position of the fan is indicated by the outlet angle of the casing. Type 4-72 fan no 2.8-6 is made into a type when it leaves the factory. The user unit can install it to the required position according to the requirements. The adjustment range of No2.8 outlet is 0 ° ~ 225 ° , the interval is 45 ° ; NO3.2 ~ 6 outlet is 0 ° ~ 225 ° , the interval is 22.5 ° ; NO8 ~ 12 outlet is 0 ° ~ 225 ° , the interval is 45 ° ; No16,20 air outlet angle made of fixed 0 ° , 90 ° , 180 ° three, can not be adjusted, the order should be noted. There are four driving modes of fan: Type A drive for No2.8 ~ 5, Type A drive for NO6 and Type C drive for No8 ~ 12, and Type C and Type D drive for No8 ~ 12, no16 ~ 20 adopts B type drive. If the above machine number, transmission mode, export angle can not meet your production needs, our factory has the ability to transform or design for you until you are satisfied.

The Fan No2.8A ~ 6A is mainly composed of impeller, casing, air inlet, motor, etc. , and the drive part impeller-it is composed of 10 backward-tilting airfoil blades, curved wheel cover and flat plate rear disc. After dynamic and static balance correction and overspeed operation experiment, it has high efficiency, stable and reliable operation and good air performance. Case-welded with ordinary steel into the volute-shaped whole. Air inlet-made into a whole structure, installed on the side of the fan, the section parallel to the axis is a curve shape, the function is to make the air flow smoothly into the impeller, and the loss is small. Drive-consists of spindle, bearing box, rolling bearing, pulley or coupling.