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Finite element analysis of crankshaft of 6M51 reciprocating compressor under gas regulation condition

Published:2021-12-22 author:JIANG Zhi-nong, WANG Jin-ming, WANG Yao, et al. Browse: 1035 Check PDF documents

Finite element analysis of crankshaft of 6M51 reciprocating

compressor under gas regulation condition

JIANG Zhi-nong1,2, WANG Jin-ming2, WANG Yao1,2, QI Zhen2, SUN Xu2, ZHANG Jin-jie1,2

(1.State Key Laboratory of Compressor Technology, Beijing University of Chemical Technology,

Beijing 100029, China;2.Beijing Key Laboratory of Health Monitoring Control and Fault Self-Recovery

for High-end Machinery, Beijing University of Chemical Technology, Beijing 100029, China)

Abstract: Aiming at the problem that the failure rate of the transmission mechanism of the large compressor increased after the introduction of the air volume adjustment device, the mechanical analysis and finite element analysis of the crankshaft of the 6M51reciprocating compressor were carried out. First, through the construction of a mechanical model, the force changes of the transmission mechanism of the reciprocating compressor unit under variable working conditions were analyzed. Then, combined with the finite element analysis the deformation and strength characteristics of the connecting rod journals at all levels during the variable working conditions of the crankshaft were analysed. Finally, the static strength and fatigue strength of the crankshaft were checked. The results show that the strength of the crankshaft of the compressor is safe and reliable, and it can operate safely and stably under variable operating conditions. However, the deformation and stress increase of the reciprocating compressor under the condition of air volume adjustment are more obvious when operating under 20%—40% load. The fatigue coefficient is greatly reduced, which will accelerate the deterioration of the crankshaft, and it is easy to break and cause the compressor to malfunction. Therefore, it is necessary to avoid keeping the unit under 20%—40% load for long-term operation. The research results can provide reference for the design of similar compressor crankshafts and variable load operation.

Key words: reciprocating compressor; air volume regulation; crankshaft; dynamics analysis; finite element analysis(FEA)

JIANG Zhi-nong, WANG Jin-ming, WANG Yao, et al. Finite element analysis of crankshaft of 6M51 reciprocating compressor under gas regulation condition［J］.Journal of Mechanical & Electrical Engineering, 2021,38(10):1324-1331.

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