AB产品1794-TB3G

1794-TB3G

螺杆式空压机工频运行时的转速/功率-周期示意图。t1是空压机加栽运行时间，t2是空压机卸栽运行时间，加栽/卸栽时的转速和功率分别为P1/n1和P2/n2。忽略空压机机械效率η的变化，W1和W2分别为空压机加栽运行时间t1和卸栽运行时间t2中由电源输送给空压机电机的能量。其中W1转换为压缩空气势能、动能和热能等形式的能量，供设备使用。而W2则转换为机械的摩擦热能和声音、震动等形式的能量损失掉。

所以螺杆式空压机经过变频改造后，由于电机处于变速运行情况下，而通过式3的推导知道电机的平均功率与电机的平均转速成一次方正比例关系。空压机变频改造后，是根据用气系统的用气量恒压变流供气；所以变频改造后，空压机在周期T（t1+ t2）内所作的功W，等于同等工况下，空压机工频运行时，加载运行时间t1内所作的功W1。如图8所示。

通过以上分析，可知只要知道螺杆式空压机工频改造前卸载运行时间和卸载电流，就可以大致计算出，相同工况下变频改造后的节能功率和节能电量（忽略机械效率η的变化）。

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