活塞式压力计活塞有效面积测量方法
2021-09-13甘蓉尹保来罗凡李雁灵王琦琪
甘蓉 尹保来 罗凡 李雁灵 王琦琪



摘要:近年来,活塞式压力计的量值传递需求不断增加,而传统的活塞压力计量传方法存在检定过程繁琐,操作经验要求高、测量程序耗时长的缺点。该文主要研究在量程范围在0.1~10 MPa 以内,以差压变送器测量准确度等级0.01级及以下活塞式压力计活塞的有效面积,并通过静压试验提出差压变送器的选用标准。该方法减少配平两套活塞系统的烦琐流程和建立流体静力平衡的冗长等待,提升工作效率,降低操作难度,重复性和稳定性达到传统法的水平,具有显著的社会效益和经济价值。
关键词:活塞式压力计;有效面积;差压变送器;量值传递
中图分类号: TB9文献标志码: A文章编号:1674–5124(2021)12–0034–05
Measurement method for the effective area of piston gauge
GAN Rong,YIN Baolai,LUO Fan,LI Yanling,WANG Qiqi (National Institute of Measurement and Testing Technology, Chengdu 610021, China)
Abstract: The demand for value transfer of piston gauge has increasing in recent years. Traditional method of calibrating piston gauge has many disadvantages such as complicated procedure, experienced operation and time consuming. This article proposed a new method for calibrating piston gauge based on differential pressure transducer chosen by static pressure experiment. This method can replace the traditional method in range of 0.1-10 MPa and accuracy class of 0.01 and below. It also solves the problem of time consuming for building hydrostatic balance in calibration process and set a new path for value transfer of pressure with advantages of promoting significantly the working efficiency, reducing difficult and shorting the calibration time, which has remarkable social benefit and economic value.
Keywords: piston gauge; effective area; differential pressure transducer; standard transfer
0引言
活塞式壓力计是基于帕斯卡定律及流体静力学平衡原理产生的一种高准确度、高重复性和高可信度的压力计量仪器,随着材料工艺和机加工能力的不断提升,活塞式压力计的可靠性和普及性都得到了极大的推动。目前建立0.005级活塞装置的法定计量检定机构中,除了中国计量科学研究院和中国测试技术研究院外,其他省级或直辖市法定计量检定机构也先后建立了该等级的压力标准装置。在整个压力量值传递体系中,压力量值传递的工作主要集中在由0.005级向0.01级活塞式压力计、0.02级活塞式压力计和0.05级活塞式压力计和数字压力计的传递。
活塞压力计的核心部件是由活塞杆和活塞筒组成的活塞系统,其产生的压力由加载的砝码质量及其有效面积来定义。……
