vacuum ventilation system 真空式通风系统
vacuum system of ventilation 抽吸通风系统
low vacuum compannd ventilation 低真空复合通风
Vacuum machines should be installed in the ventilation and dry cleaning establishments.
真空机应安装在干燥通风和清洁的场所。
Ventilation of starting rotation device ventilation pipe is from Axial flow of swirl hole inner surface takes air leads to vacuum cavity, model existence of scale effect.
起旋室通气井通风系由旋流洞内表面轴向水流“挟带”空气而致空腔内气体压强减小进入，模型存在缩尺效应。
Higher temperature, oil temperature increase, decrease viscosity, steam increased, the limit will cause a vacuum up, we should strengthen the ventilation cooling.
环境温度较高时，油温升高，粘度下降，饱和蒸汽增大，会引起极限真空上升，应加强通风散热。
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