生物洁净室的负压控制

介绍了负压生物洁净室需要保持的负压控制值的相关要求,分析了房间负压和漏风量的关系。当采用定风量阀末端控制洁净室负压时,定风量阀的控制精度对结果产生很大影响,通过实测分析了定风量阀无法保持风量恒定的原因,提出了漏风量换气次数的概念及定风量阀在洁净室负压控制中的适用条件,并讨论了采用变风量阀及手动调节阀控制洁净室负压的方法。

Negative pressure difference Control in biological clean rooms

Presents the relative regulation value of negative pressure difference that need to be maintained in biological clean rooms. Analyses the relationship between negative pressure difference value and air leakage from clean rooms. When the constant air volume valve is adopted to control the negative pressure, its precision has severe effect on the control result. According to the field testing, analyses the reasons of constant air volume valve failing to keep constant air volume and puts forward the concept of air leakage exchange rate and application condition of the constant air volume valve on the negative pressure difference control in clean rooms. Discusses the method of using VAV valves and manual regulating valves to control the negative pressure difference in clean rooms.