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为研究和优化极限温度状态下的膜式燃气表内部结构、材料及计量性能,文章研究设计了一种置入高低温程控箱内、检测极限温度下的膜式燃气表计量性能的试验装置。该装置采用临界流文丘里喷嘴作为主标准,罗茨流量计为参考标准。主标准由多个临界流喷嘴组成,可并联组合使用,喷嘴流出系数作相应的雷诺数修正。装置检测流量范围0.016~10 m3/h,适用温度范围-25~+55℃,装置扩展不确定度为0.5%(k=2)。可检测G1.6~G10各规格的膜式燃气表的流量误差特性和压力损失特性。
In order to study and optimize the internal structure, material and metrological performance of membrane gas meter under the condition of ultimate temperature, this paper studies and designs a test device which measures the metrological performance of membrane gas meter in the temperature control box and detects the limit temperature. The device uses a critical flow Venturi nozzle as the main standard, Roots flow meter as a reference standard. The main standard consists of a number of critical flow nozzle composition can be combined with the use of the nozzle outflow coefficient for the corresponding Reynolds number correction. Device detection flow range of 0.016 ~ 10 m3 / h, the applicable temperature range -25 ~ +55 ℃, device expansion uncertainty of 0.5% (k = 2). It can detect the flow rate error and pressure loss characteristics of the G1.6 ~ G10 membrane gas meters.