关键词: 压力倍放单元, 流场特性, 刚度优化设计, 压降数学模型, “通用—反演—具身”参数推演方法

Abstract:

Aiming at the issues of delayed response in gas self-closing valves under gas leakage conditions， a high-precision sensing mechanism was designed based on the pressure amplification effect to improve the accuracy of abnormal flow cutoff. In the general parameterization （GP） stage， a pressure amplification sensing mechanism was explored， and a corresponding pressure amplification unit structure was designed. The spool dynamics model and a zonal pressure drop mathematical model were established， revealing the core mechanism by which minute flow changes trigger an exponential pressure drop surge and the key influences of spring stiffness on response characteristics. In the inverse parameterization / specific parameterization （IP/SP）stage， key parameter optimization was carried out based on the proposed GIS-P derivation method： through IP combined with FLUENT flow field simulation data， key empirical parameters in the pressure drop mathematical model were calibrated； then， via SP focusing on the target cutoff flow rate， the optimal spring stiffness was determined based on the analysis of the spool force-displacement characteristics. The research confirms that the proposed pressure amplification unit and the GIS-P optimization method may provide an effective theoretical basis and key parameter design guidance for the development of high-precision gas self-closing valves.

Key words: pressure amplifier, flow field characteristics, stiffness optimization design, mathematical model of pressure drop, “general-inverse-specific” parameterization（GIS-P） derivation method