气密性检测仪校准装置的研究

发布时间：2018-03-27 18:54

本文选题：压差　切入点：泄漏量　出处：《华南理工大学》2015年硕士论文

【摘要】：国内装备制造业正高速发展,密封产品质量性能越发引起人关注,气密性检测仪数量随之增多,但是国内气密性检测仪至今无法实现溯源,既没有相应校准系统,也没有国家校准规范。该类仪器校准仅参照JJG875-2005《数字压力计》规程对输出压力作校准,未能实现压差校准,可见此类方法并不能满足气密性检测仪校准要求。因此,本文提出一种可对气密性检测仪提供溯源依据的气密性检测装置,实现压力和压差传感器同时校准。论文主要工作包括:⑴通过分析气密性检测仪原理、运行过程及推导泄露量和压差关系公式,设计气密性检测仪校准装置总体结构方案。该校准装置主要由控制装置、计量标准器具和微压调节装置三个部分组成,其中控制装置由三菱PLC及液晶触摸屏组成,并实现主程序和关键校准子程序。⑵根据气密性检测仪输出压力和压差精度要求,确定标准器技术指标,选定希特公司的压力和压差传感器作为标准器,通过高精度AD转换器连接,使气密性检测仪压力和压差传感器精度符合校准要求。⑶最后对整个系统进行重复性、稳定性、示值误差相对扩展不确定度进行分析。本校准装置工作过程,其压力和压差等各种参数显示正确,通过传统方法对校准装置压力传感器和压差传感器进行静态校准,校准结果表明传感器准确度等级符合0.1级要求;同时通过和传统方法标准漏孔法测量结果比对,结果符合相关标准要求。根据校准结果计算测量结果相对扩展不确定度为分别为U95rel=0.29%和U95rel=0.12%,符合小于允许误差的1/3的要求。该校准装置完全达到预期总体目标,本文研制的气密性检测仪校准装置为气密性检测仪的校准提供坚实基础。
[Abstract]:With the rapid development of domestic equipment manufacturing industry, people pay more attention to the quality and performance of sealing products, and the number of air tightness detectors increases. However, the domestic air tightness detectors have not been able to trace their source, and there is no corresponding calibration system. There is also no national calibration specification. The calibration of this type of instrument only refers to the JJG875-2005 digital pressure gauge code for the calibration of the output pressure and fails to realize the calibration of the pressure difference. It can be seen that this kind of method does not meet the calibration requirements of the gas tightness detector. In this paper, a kind of air tightness detecting device which can provide traceability basis for gas tightness detector is put forward, which can calibrate the pressure and pressure difference sensors simultaneously. The main work of this paper includes the analysis of the principle of the air tightness detector by analyzing the principle of the air tightness detector. The operation process and the formula of the relationship between leakage quantity and pressure difference are deduced, and the overall structure of the calibration device of the gas tightness detector is designed. The calibration device is mainly composed of three parts: the control device, the measuring standard instrument and the micro-pressure regulating device. The control device is composed of Mitsubishi PLC and LCD touch screen, and the main program and the key calibration subroutine .2 are used to determine the technical specifications of the standard device according to the precision requirements of the output pressure and pressure difference of the gas tightness detector. The pressure and pressure difference sensors of Hite Company are selected as standard devices, which are connected by high-precision AD converters, so that the accuracy of the pressure and pressure differential sensors of the gas tightness detector meets the calibration requirements. 3. Finally, the whole system is repeatable and stable. The relative spread uncertainty of the indication error is analyzed. In the working process of the calibration device, various parameters such as pressure and pressure difference are shown correctly, and the static calibration of the pressure sensor and the differential pressure sensor of the calibration device is carried out by the traditional method. The calibration results show that the accuracy level of the sensor meets the requirement of class 0.1, and the accuracy of the sensor is compared with that of the traditional standard leak method. The results meet the requirements of the relevant standards. The relative extended uncertainty of the measured results is U95rell 0.29% and U95rell 0.12, respectively, according to the requirement of less than one third of the allowable error. The calibration device completely achieves the expected overall goal. The calibration device of the gas tightness detector developed in this paper provides a solid basis for the calibration of the gas tightness detector.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH823.2;TP216

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