基于流量时间法的活塞式热量表检定装置研制

发布时间：2018-05-17 14:53

  本文选题：流量时间法 + 活塞式　； 参考：《中国计量学院》2016年硕士论文

【摘要】：近十年来,我国供热商品化的进程有了快速的发展,按户计热收费已经成为供热发展的既定目标,在城市供热体制改革中,作为按热量计量收费的关键设备的热量表,其作为贸易交接的重点计量器具已被列入国家强制检定目录,要求在安装前进行首次检定。而目前国内各计量技术机构和生产企业正在使用、改造的热量表检定装置仍然是基于静态质量法或容积法的传统标准装置,虽然检定精度高,但却存在效率低,能耗大等劣势,难以适应热量表行业的快速发展。本文在现有热量表检定技术的基础上,设计了一套基于流量时间法的活塞式热量表检定装置,根据热量表检定规程的要求,提出了检定装置的总体设计方案和设计指标,完成了对检定装置的机械设计及对各个组成部件的选型计算,并利用FLUENT软件对检定装置的实验管路进行了数值模拟,以验证检定装置机械设计的合理性,最后对检定装置的上下位机检定控制程序进行了设计,建立了一套以西门子S7-1200 PLC为核心,LabVIEW编程运行环境下的自动检定控制系统,实现了对多个热量表的总量检定和分量检定;利用高精度热电阻检定仪及标准铂电阻完成了对热量表配对温度传感器的检定。实验结果表明,检定过程中,检定装置运行平稳,无噪声和振动等异常,根据检定装置的不确定度分析得到,检定装置对热量表流量传感器检定的扩展不确定度为0.374%,对配对温度传感器检定的扩展不确定度为0.0118℃,符合检定装置的设计指标及热量表检定规程的要求。
[Abstract]:In the past ten years, the process of commercialization of heating in our country has developed rapidly. Heat collection by household has become the established goal of the development of heating. In the reform of urban heating system, heat meter is the key equipment of heat metering and charging. As a key measuring instrument for trade transfer, it has been listed in the national compulsory verification catalogue, which requires the first verification before installation. At present, the domestic metering technical institutions and production enterprises are using the modified verification device for the heat meter, which is still a traditional standard device based on static mass method or volume method. Although the accuracy of verification is high, it has disadvantages such as low efficiency, large energy consumption, and so on. Difficult to adapt to the rapid development of the heat meter industry. Based on the existing verification technology of heat meter, a verification device of piston type heat meter based on flow time method is designed in this paper. According to the requirements of verification regulation of heat meter, the overall design scheme and design index of verification device are put forward. The mechanical design of the verification device and the selection and calculation of the components are completed, and the numerical simulation of the experimental pipeline of the verification device is carried out by using FLUENT software to verify the rationality of the mechanical design of the verification device. Finally, the verification control program of the upper and lower machine of the verification device is designed, and a set of automatic verification and control system based on Siemens S7-1200 PLC is established, which realizes the total quantity verification and component verification of multiple heat meters. The matching temperature sensor of heat meter is calibrated by using high precision thermal resistance calibrator and standard platinum resistance. The experimental results show that, in the process of verification, the verification device runs smoothly and has no noise and vibration. According to the analysis of the uncertainty of the verification device, The extended uncertainty of the verification device for the flow sensor of the heat meter is 0.374, and the extended uncertainty for the verification of the matched temperature sensor is 0.0118 鈩，

本文编号：1901810