Design of Key Parameters of Piston-cylinder Assembly of 500MPa Piston Pressure Gauge
WANG Chen1,LIU Huan-yu1,YANG Yuan-chao2,FAN Shuang-jiao1,CAO Jin3,PANG Gui-bing1
1. College of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian, Liaoning 116033, China
2. National Institute of Metrology, Beijing 100029, China
3. Chongqing Institute of Metrology and Quality Inspection Chongqing 400050, China
Abstract：According to the requirements of 500MPa piston pressure gauge piston system design, its parameters are calculated theoretically, and the section diameter of piston rod, the maximum length of piston rod extending out of piston barrel, the outer diameter of piston barrel and the gap between piston barrel and fixed sleeve are determined. The design results are analyzed by finite element analysis software. The results show that the strength of the piston system is reliable. The piston system is manufactured according to the design results, and the verification test is carried out on the self-developed 500MPa piston pressure gauge prototype. The piston system operates stably in the process of 500 times of pressurization and decompression. The uncertainty of piston is calibrated, and the expanded uncertainty is 0.0038%. It shows that the structural design of the piston system is reasonable and can meet the requirements of practical application.
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2021, Vol. 42 
