Abstract:

This paper introduced the functional components of cabin pressure regulating system CTY-xx. The structure and  working principles of NPRV were explained. The theory of plate was used to analyze the behavior of the diaphragm in NPRV, and it is conclused that the opening of the valve is proportional to the pressure difference. The calculation method of effective flow area was given and the needed conditions of acquiring maximum nominal flow area was deduced. In analyzing dynamic characterization of the valve, the requirements of system stability can not be met if only the external behavior is concerned.This paper took the material property of polymer into consideration in establishing dynamic equation of the diaphragm. On the basis of that, the requirements of system stability were analyzed and the ways to shorten response time were pointed out. The testing results show that the bigger the valve's radium, the quicker the relief process.

Key words: cabin, pneumatic, pressure regulating system, negative pressure relief valve(NPRV), characterization

摘要：

介绍了CYT-xx压力调节系统的组成,解释了负压活门的结构和工作原理。将薄片材料的形变理论应用于负压活门的膜片,得出膜片活动范围内活门开度与压差之间存在线性关系的结论，给出了活门有效气流面积的计算方法，推导出活门取得最大名义气流面积应满足的条件。在分析活门动态特性时，仅考虑膜片形变过程的外部特性满足不了系统的稳定性要求，于是，从高分子材料内部特性出发，建立了描述膜片形变过程的动态方程，并据此分析了系统稳定所必须的条件，指出满足稳定性要求条件下提高快速性的方向。试验结果表明，活门半径越大，泄压过程越快。

关键词: 座舱, 气动, 压力调节系统, 负压活门, 特性