Before installing a fan, first understand the difference between the axial flow fan and the centrifugal fan, and the matching relationship between the flow and pressure system of the Fan;. First of all, the difference between Centrifugal Fan and axial fan is understood: Centrifugal Fan is the axial air inlet and the radial air inlet, using centrifugal force to determine the rotating speed and outer diameter to work, so that the air can increase the pressure, therefore, at the same outer diameter and rotating speed, the pressure produced is greater than the pressure of the mixed-flow fan and the axial-flow Fan, the air volume is smaller than the mixed-flow Fan, the axial-flow fan is the axial air inlet, the axial-flow air outlet, the blade inclination angle, the thrust lift to carry on the work, therefore, the centrifugal fan is the axial air outlet, the axial air outlet, blade Angle, thrust lift. Under the same outside diameter and rotating speed, the pressure produced is far less than that of the Centrifugal Fan. Under the axial structure, because the over-flow area is much larger than the Centrifugal Fan, the air volume is much larger than the Centrifugal Fan The structure to be considered and the system resistance of the piping system and fan characteristics (pressure, flow, speed) to match; if the system resistance, smaller size of the structure, we must choose centrifugal fan, because fan premise in the workflow, first, the pressure on it to overcome system resistance, air flow rate (speed) ; for cooling, air flow rate (speed) , just enough, extra air volume will consume the fan reactive power; fat reduction of engine efficiency; on the other hand, if the system resistance is small, large size structure, it is necessary to select the axial flow fan; as a low-pressure axial flow fan, enough to overcome the resistance of the system, so it can exhaust a large amount of air; finally, it should be pointed out that in operation, the fan, if the pressure in the system produces an insurmountable resistance, the amount of air is zero; in this case, the fan is doing useless work;

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