pVTt法气体流量标准装置开关阀时间系统差补偿方法  

Compensation Method of Time System Difference of On-off Valve of pVTt Gas Flow Standard Device

作　　者：李宁 向德华 周艳 朱宁 陈炜骄 徐旷宇 LI Ning;XIANG De-hua;ZHOU Yan;ZHU Ning;CHEN Wei-jiao;XU Kuang-yu(Hunan Institute of Metrology and Test,Changsha,Hunan 410014,China)

机构地区：[1]湖南省计量检测研究院,湖南长沙410014

出　　处：《计量学报》2021年第8期1012-1017,共6页Acta Metrologica Sinica

基　　金：国家市场监督管理总局科技计划项目(2019MK059)。

摘　　要：针对pVTt法气体流量标准装置中开关阀影响喷嘴流出系数的测量结果的问题,分析了pVTt法气体流量标准装置中高真空蝶阀和高真空球阀的流通面积与开度的关系,分别推导了2种阀门的质量流量随时间变化的计算公式,并计算了2种阀门最佳的计时位置。设计了一套实验装置对2种阀门最佳的计时位置进行了验证,结果表明:所用蝶阀和球阀的最佳计时点分别位于阀门打开4.5°和2.5°的位置。Aiming at the problem that the switch valve in the pVTt gas flow standard device affects the measurement result of the nozzle outflow coefficient,the relationship between the flow area and the opening of the high vacuum butterfly valve and the high vacuum ball valve in the pVTt gas flow standard device is analyzed,and the formulas of the mass flow rate of the two valves with time are respectively derived;the best timing positions of the two valves are calculated;design experiments have verified that the best timing points of the butterfly valve and ball valve used are located at the valve opening position of 4.5°and 2.5°,respectively.

关 键 词：计量学 气体流量标准装置 pVTt法 开关阀 系统时间差 计时位置 

分 类 号：TB937[一般工业技术—计量学]