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现场设计风机时,通常先按所需要的风压、风量、和电动机转速计算出比较速n_(?),然后根据比转速n_(?)在风机图册上选型,如果选不到合适的风机型号,可以变动电动机的转速再选,如再选也不行,就需要进行变型设计。变型设计以比转速n_(?)相近的型号风机为基础,根据风压H求出风机叶轮直径,再根据风量Q对叶轮宽度和机壳宽度进行修正。1 变型设计的几点体会
When designing the fan in the field, the relative speed n_ (?) Is usually calculated according to the required air pressure, air volume, and motor speed, and then selected according to the specific speed n_ (?) In the fan book. If no suitable Fan model, you can change the speed of the motor re-election, such as re-election does not work, you need to change the design. The variant design is based on a fan of similar size to the n_ (?) Speed. The fan impeller diameter is obtained from the wind pressure H, and then the width of the impeller and the width of the housing are corrected according to the air flow Q. A few variants of the design experience