Reliability optimization design method for crankshaft of reciprocating compressor

Abstract

The invention belongs to the field of structure optimization design for components of compressors, and particularly relates to a reciprocating compressor crankshaft reliability optimization design method. The reciprocating compressor crankshaft reliability optimization design method includes steps of performing three-dimensional modeling, meshing to generate finite element modules, obtaining crankshaft stress values on discrete working conditions, calculating stress strain distribution of a crankshaft on the discrete working conditions by the aid of finite element modules, determining dangerous working conditions and dangerous nodes of the crankshaft, obtaining the stress values of the dangerous nodes on different discrete working conditions, checking fatigue strength of the different dangerous nodes, analyzing the finite element modal of the crankshaft to obtain natural vibration mode and natural frequency of the crankshaft, and finally judging whether resonance exists between frequency of exciting force and the natural frequency or not. The reciprocating compressor crankshaft reliability optimization design method is easy to operate and implement, has effects of improving working reliability of the crankshaft practically, improving operation reliability of high-parameter compressors while having a high reference value to realize miniaturization and light weight on the premise of reliability guarantee.

Description

technical field [0001] The invention belongs to the field of structural optimization design of compressor parts, and in particular relates to a method of using SolidWorks software to establish a three-dimensional solid model of a crankshaft of a reciprocating compressor, and generate a finite element model from the three-dimensional solid model of the crankshaft to complete crankshaft strength analysis and crankshaft transition Reliability optimization design method for crankshafts of reciprocating compressors with rounded corners. Background technique [0002] The crankshaft is the main moving part of the reciprocating compressor, and its size parameters and performance directly affect the working reliability and life of the compressor. With the development of the compressor and the continuous improvement of the strengthening index, the working conditions of the crankshaft are more severe. The crankshaft is subjected to the periodically changing load caused by the gas press...

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Problems solved by technology

There are also some documents on three-dimensional finite element analysis of crankshafts in academic conferences and journals at home and abroad, which have played a role in promoting the application of finite element method in the study of crankshaft strength, but these works also have some shortcomings, such as: some The calculation model only considers a single load situation, ignoring the torque and inertial force; some only calculate a single crank, and the side conditions are too simplified, without considering the load change of the crankshaft during the actual working process, let alone from the entire crankshaft. The angle of analysis considers the interaction of each crank throw, so it can only study the stress distribution law near the fillet of the stress concentration part of the crankshaft, and cannot calculate the working stress there.

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