Optimum Design on Structural Parameters of Reciprocating Refrigeration Compressor Crankshaft

Crankshaft is one of the main components of a piston refrigeration compressor. Its structure parameters influence the reliability and service life. [Research objective] Improve the reliability of the crankshaft and further understand the impact of structural parameters on the strength of the crankshaft. [Research method] The forces acting on crankshaft are analyzed on the basis of dynamic calculation of reciprocating compressor working process. Finite Element Method (FEM) is applied for three-dimensional modeling and static strength analysis. [Research result] The stress at the transition fillet of crankshaft journal under the maximum comprehensive piston force is obtained accordingly. The reliability and accuracy of this model is verified by the experimental results. The influence of the crankshaft with crankpin diameter, center distance of adjacent crankpins and fillet radius on stress concentration has been investigated in detail. The optimal undercut fillet is designed for reducing the maximum stress obviously. The results provide a reference for similar design and production of compressor crankshaft.