A new high-pressure clearance seal with flexible laddered piston assembly in oil-free miniature compressor for potential hydrogen applications and investigation on its dynamic sealing efficiency |
| |
| Affiliation: | 1. School of Mechanical Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. Department of Mechanical Engineering, North China Electric Power University, Baoding, Hebei 071003, China;3. School of Mechanical Engineering, Shannxi University of Technology, Hanzhong 723001, China;4. State Key Laboratory of Compressor Technology (Anhui Laboratory of Compressor Technology), Hefei 230031, China;5. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China |
| |
| Abstract: | In this paper, a new flexible laddered piston assembly of clearance seal without any soft seal part was proposed for a long life time run of high-pressure stage in oil-free miniature compressor for potential hydrogen applications. In this assembly, the functions of radial load bearing and gas sealing were undertaken independently by large and small piston. The dynamic sealing performance evaluation was carried out by comprehensively considering the real-time variation of gas properties and piston motion with thermodynamic process in the compression chamber. Simulation study shows that the introduced clearance gap has a great influence on the expansion, compression and discharge process. Leakage through the clearance would lead to the in-cylinder pressure drop during the discharge process and bring about oscillation and earlier closure of the discharge valve. Sealing clearance exert more significant influence on the sealing efficiency in the high-pressure stage compared to sealing length and shaft speed. |
| |
| Keywords: | Laddered piston assembly Oil-free miniature compressor High-pressure clearance sealing Thermodynamic modelling Volumetric efficiency |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
