置换法气体流量标准装置的设计  

Design of displacement gas flow standard equipment

作　　者：王锐刚[1] 赵金燕[1] 胡波[2] 黄勇[2] 

机构地区：[1]云南农业大学基础与信息工程学院,云南昆明650201 [2]云南省计量测试技术研究院,云南昆明650228

出　　处：《机电工程》2013年第8期952-955,共4页Journal of Mechanical & Electrical Engineering

基　　金：国家质检总局科技计划资助项目(2008QK313)

摘　　要：气体流量计量是科学计量的一个重要组成部分,针对目前采用的气体流量标准装置对于小流量气体计量准确度低,并且校准费用大,实现高精度的气体流量计检定及校准较为困难等问题,根据流体力学的基本原理,采用液体置换法设计了检测气体流量的标准方法。当液体以一定流量流入标准量器,测出了流入标准容器的液体流量,并与被校流量计的示值进行了比较,从而检测被测气体流量计的精度,同时在制备的样机上进行了试验。研究结果表明,该方法可以使装置的扩展不确定度为0.09%,校准精度达到0.2级,满足设计的要求。该气体流量标准装置具有操作方便、稳定性高、重复性好等优点,特别是在高准确度小流量气体测量方面具有极大的优势。The measurement of gas flow is an important part of scientific measurement. Aiming at the problems that the standard equipment at present is adapted lower accuracy and higher cost to the calibration for small gas flow measurement, it is difficult to be realized gas flow verification and calibrated for high precision. According to the basic principle fluid mechanics, the standard method for the detection of gas flow was designed by using liquid displacement method. When the liquid was flowed into the standard measure, it was measured liquid flow into the standard containers, and compared the value with showing for the flow gauge, so it could be detected the gas flow meter accuracy. The experiments were carried out in the preparation of the prototype. Test results indicate that this method could make the expansion uncertainty reach 0.09%, and the calibration accuracy reach 0.2 for the equipment, which could reach the design requirements. The gas flow standard equipment has the advantages of convenient operation, high stability, good repeatability, especially with great advantages in high accuracy for small gas flow measurement.

关 键 词：气体流量计量 流量校准 置换法 高准确度 

分 类 号：TH814[机械工程—仪器科学与技术] TP273[机械工程—精密仪器及机械]