3 风机的节能分析3.1 风机的基本特性(1) 风压特性以管路中的风门开度不变为前提,表明在某一转速下,风压与风量间关系的曲线PF=f(Q),称为风压特性曲线,如图9中的曲线①所示。与水泵的扬程特性不同,当风量很小时,风压也减小,故曲线呈两边低、中间高的形状。近似计算时,可以把 3 fan energy-saving analysis 3.1 The basic characteristics of the fan (1) wind pressure characteristics of the throttle opening in the pipeline unchanged as a precondition, indicating that at a certain speed, wind pressure and air volume curve PF = f (Q) , Called the wind pressure characteristic curve, as shown in curve (1) in Figure 9. And the pump head characteristics are different, when the wind is small, the wind pressure is also reduced, so the curve was low on both sides, the middle of the high shape. Approximate calculation, you can put