差压式双锥流量计研究及实验分析

摘要

Some traditional differential pressure flowmeter such as orifice has big pipe pressure loss and big measurement error in small flow measurement because of the throttle piece,this paper designed a double-cone prototype flowmeter based on small prcssure loss double-cone throttle and the intelligent controller of MSP430.Master meter method was adopted to realize the actual process water flow calibration and verification experiment,verification experiments included error analysis,repeatability,linearity analysis and evaluation of uncertainty.Experiment result shows that the prototype has higher measurement accuracy compared with orifice and nozzle throttle meters,measurement error is less than 0.6％ over 0.5～4.0 m/s range.%针对孔板等传统差压式流量计中节流件对流体压力损失大、小流量测量误差大等问题,研究采用压力损失小的双锥节流件,并结合MSP430智能控制器设计制作了DN50双锥流量计样机.以水为介质采用标准表法对双锥流量计进行了实流标定及测试,测试过程包括相对示值误差分析、重复性分析、线性度分析和不确定度评定.结果表明,双锥流量计在0.5～4.0 m/s范围的测量误差在0.6％以内,同标准孔板和标准喷嘴相比具有较高的测量精度.