研制了一种量程为3m~3/h的内潜式钠流量计,这是一种全密封结构的流量计,它可以浸入钠中工作。详细介绍了它的结构、分度特性与阻力特性的理论计算、试验装置与标定试验,给出了它在200～600℃温度范围的分度特性解析表达式及误差分析。这种内潜式钠流量计的基本误差<±2.3％量程。它可用于解决快堆堆内部件的钠流量测量问题,例如,堆内钠净化回路、内潜钠泵及堆内考验部件等的钠流量测量。 Developed a range of 3m ~ 3 / h of sub-submersible sodium flow meter, which is a fully enclosed structure of the flow meter, which can be immersed in sodium work. The structure, indexing characteristics and resistance characteristics of the theoretical calculation, test device and calibration test are introduced in detail. The analytical expression and error analysis of its indexing characteristic in the temperature range from 200 ℃ to 600 ℃ are given. This sub-submersible sodium flowmeter basic error <± 2.3% range. It can be used to address sodium flow measurement issues within parts of a fast reactor stack, such as sodium flow measurement in a sodium purge loop, a submerged sodium pump and in-stack test components.