Topology Optimization Design And Research On Connecting Rod Structure Of A Compressor

With the rapid development of intelligent computer information technology and interdisciplinary integration,in order to reduce the economic cost and improve the material utilization rate of component structure,computer aided design is also more and more applied to the structural design of construction machinery.The maintenance room of the construction site is particularly important in the construction because of the long-term need to maintain the specimens to test the reliability of building materials.The vast majority of compressors on the maintenance outdoor unit are scroll compressors.However,due to the complexity of the structure of scroll compressors,it is not easy to optimize them.Therefore,the comparable power is small,which can meet the needs of the minimal type of engineering cultivation specimens in a small range,and the mature small connecting rod compressors are applied.Small maintenance room refrigeration compressor is the core equipment of refrigeration,in which the crank-connecting rod structure plays a very important role in refrigeration compressor,is one of the core components of refrigeration compressor,is the main rod to ensure that the circular shaft and the compression cylinder piston can work together.The crank-connecting rod in the compressor work is mainly affected by the reciprocating load and other factors,because the crank-connecting rod reciprocating load characteristics,make it more easy to fracture,in order to ensure the crank-connecting rod can work efficiently need to carry on the statics,modal,fatigue analysis of the connecting rod.Based on the analysis,the crank connecting rod is optimized and improved.This paper takes the connecting rod of a refrigeration compressor of a project as the research object,simplifies the working conditions and design of the connecting rod under the general working state,establishes the structure model through the modeling software,carries on the load analysis,the topology optimization design,obtains the optimal structure.The main research contents and work are as follows:(1)The internal components and structure of the compressor are introduced.According to the real structural materials,relevant parameters are set and constraint conditions are imposed.The finite element three-dimensional model of connecting rod structure and its important components is established through the modeling software Space Claim.(2)The Workbench platform was imported for finite element load analysis to simplify the analysis of the force of connecting rod structure under normal working state.In order to ensure the accuracy of its finite element simulation,the quality of model mesh division was evaluated.Through statics analysis,modal analysis,fatigue analysis,we can know the load under the normal working state.After calculation,the load concentration part of the crank connecting rod is basically consistent with the actual damage part.Under normal working conditions,the design is relatively conservative,and the optimization space is abundant,which is suitable for optimization design.(3)The mathematical model of the crank connecting rod structure was established,and the variable density method(SIMP)topology optimization method was used to optimize the design of the connecting rod model under the initial conditions.The initialization optimization model was obtained and analyzed.Through the analysis,the most dangerous and large deformation parts were known.The second analysis shows that the optimal design method can effectively improve the service efficiency and service life of the crank connecting rod.After the final topology optimization,the mass of the connecting rod structure is reduced by 30.66%,the maximum stress is reduced by 20.14%,and the maximum displacement is slightly increased,but the effect is not obvious and can be basically ignored.The fatigue analysis and modal analysis results are good,which provides a reference for the work simulation research of the compressor connecting rod.At the same time,it also provides a design method with low cost and good effect for the mechanical optimization design in related fields.