Difference of Backward Centrifugal Fan And Forward Centrifugal Fan

In this paper, we mainly talk about the backward centrifugal fan and forward centrifugal fan difference. The efficiency of the tilting centrifugal fan is high and the power curve is not overloaded. Its power curve is usually in the middle of the common range to reach the maximum, so generally not overload. The blades and impellers have high structural strength and can be used in higher hydrostatic systems. The performance curve of the forward centrifugal fan may be parallel to the pipe network resistance curve and the system static pressure may cause the motor to be overloaded. In addition, the blade structure strength is low, can not run at a higher speed.

From the efficiency point of view, since the forward speed of the forward blade is higher than that of the backward blade, the kinetic energy of the airflow is also lost in the case of the solenoid of the cabinet, so that the static pressure The proportion of the head is very small. And the backward speed of the rotor is relatively small, so the air flow in the energy conversion loss is small, so to overcome the system resistance of the static pressure accounted for a larger proportion. In the backlash blade fan, the channel is generally enlarged and is more relaxed than the channel of the forward blade, and the curvature of the rear blade is smaller than that of the forward blade, so the air flow is in the back The hydraulic loss in the middle of the road is smaller than that of the forward blade. So that the efficiency of backward centrifugal fans to be high.

From the noise point of view, due to the forward speed of the forward lap to the air flow than the backward blade large, so the air flow in the energy conversion is also greater loss of air flow and chassis collision speed is also large, Channel curvature is gentle, air flow is also more smooth. So the forward blade blade fan than the backward blade fan noise.

Through the analysis of the forward and backward blade fans, I think in the selection of fans, in addition to the fan body size, equipment purchase costs, land area and other initial investment comparison, the fan efficiency, power consumption and other management Cost, but also have enough understanding.