一、前言 我厂使用的上海鼓风机厂生产的9～19～11No9离心通风机,因其具有风压高,风量大的特性,能适应小氮肥厂造气工段制气的需要,愈来愈受广大用户欢迎。但因小氮肥造气系统生产采用间歇法制气,当炉子停止送风时,鼓风机发生喘振,产生强烈的振动,发出阵阵吼叫声,A声压级高达108～110分贝,操作人员对该机产生了严重的恐 First, the foreword I plant uses the Shanghai blower factory production 9 ~ 19 ~ 11No9 centrifugal ventilator, because of its wind pressure is high, the air volume characteristic, can adapt to the small nitrogen fertilizer plant gas production section the gas demand, more and more receives The majority of users are welcome. However, the production of small nitrogen gas system using intermittent gas, when the furnace to stop blowing, the blower surge occurs, resulting in strong vibration, bursts of roar, A sound pressure level up to 108 ~ 110 dB, the operator of the Machine has a serious fear