调节引风机，使上箱体中床层物料上部保持微负压，维持良好的干燥环境并防止粉尘外泄（略）。
Fan regulation, which box on the bed material to maintain the upper-vacuum, maintain good dry environment and prevent dust leakage.
在紧密纺大风机系统设计中，车头、车尾各锭的负压差异要保持在允许误差范围之内。
When designing FDF system of compact spinning, the negative pressure drops resulting from spindles at the front and back of the machine should be kept within allowance.
空气管道出口处负压现象的发现，打破了传统的空气管道终端压力分布理论，改变了人们长期形成的风机出口管道终端不会出现负压的观念。
The traditional pressure distribution theory in air pipeline has been smashed by discovery of vacuum phenomena in the outlet of air pipeline.
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