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叙述了通风机变型设计原则，针对前向多翼风机特点，介绍了变型设计方法及在变型设计时确定风机结构参数的若干建议。
Describes the design principle of variable fan, according to the characteristics of forward multi-winged fan, introduces the variant design method and some suggestions on how to determine the fan structure parameters in the variant design.