热力膨胀阀氦质谱自动检漏系统的研制

发布时间：2018-02-24 09:27

本文关键词： 氦质谱检漏真空 PLC　出处：《中国计量学院》2014年硕士论文　论文类型：学位论文

【摘要】：本课题对热力膨胀阀氦质谱检漏技术进行了研究并对现有检漏工艺进行优化，设计研发一套适应批量化生产模式的热力膨胀阀氦质谱自动检漏系统。论文首先分析了热力膨胀阀传统检漏方法在效率和精度上的弊端，阐述了氦质谱检漏的原理和方法以及漏率的计算，在此基础上研究了国内外氦质谱检漏技术的发展现状，指出研制热力膨胀阀氦质谱自动检漏系统对热力膨胀阀生产及检测行业具有重要的意义。然后，论文提出了热力膨胀阀氦质谱自动检漏系统的整机设计方案，主要可以分为气路系统、电气控制系统和测试软件三部分。气路系统负责实现对产品的检漏工作，包括获得稳定的检漏气体和检漏所需的真空度等；电气控制系统实现对各部件协调控制，使各工位之间交错测试，互不干扰地完成整个检漏流程。测试软件包括人机交互界面和PLC软件两部分。最后，分析了影响检漏系统运行的因素，，研究了抽真空过程中的数学模型，对系统管路大小和排布进行了计算分析，保证了管路流导与真空泵抽速相匹配，实现了整个系统的优化。通过实验和数据分析表明，系统可以检测到的最小漏率可达1107mbar l/s，检漏节拍最快可达15s/只，与传统的检漏方法相比大大提高了检漏精度和节拍，实现了产品的高精度快速在线检测。
[Abstract]:In this paper, the leak detection technology of thermal expansion valve helium mass spectrometry is studied, and the existing leak detection technology is optimized. An automatic leak detection system for thermal expansion valve helium mass spectrometry is designed and developed to fit the mass production mode. In this paper, the disadvantages of the traditional leak detection methods of thermal expansion valve in efficiency and precision are analyzed, the principle and method of helium mass spectrometry leak detection and the calculation of leakage rate are expounded. Based on this, the development status of helium mass spectrometry leak detection technology at home and abroad is studied. It is pointed out that the development of automatic leak detection system for helium mass spectrum of thermal expansion valve is of great significance to the production and detection of thermal expansion valve. Then, the paper puts forward the whole design scheme of the helium mass spectrum automatic leak detection system of thermal expansion valve, which can be divided into three parts: gas path system, electrical control system and test software. The gas path system is responsible for the leak detection of the product. It includes obtaining stable leak detection gas and vacuum degree needed for leak detection, etc. The electric control system realizes coordinated control of all parts, which makes the work stations interlaced with each other. The testing software includes two parts: the man-machine interface and the PLC software. Finally, the factors affecting the operation of the leak detection system are analyzed, and the mathematical model in the vacuum pumping process is studied. The pipe size and arrangement of the system are calculated and analyzed to ensure the matching of the pipeline flow guide with the pumping speed of the vacuum pump. The optimization of the whole system is realized. The experiment and data analysis show that the minimum leakage rate can be detected up to 1107 mbar l / s, and the fastest leak detection beat can be up to 15 s / s. Compared with the traditional leak detection method, the accuracy and rhythm of leak detection are greatly improved. The high precision and fast on-line detection of the product is realized.
【学位授予单位】：中国计量学院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB774.3

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