| The reciprocating piston compressor has a simple structure,high cost performance,mature manufacturing technology in China,and has an irreplaceable position in the development of the national economy.However,due to the disadvantages of piston compressor such as heavy operation,large vibration noise,and many wearing parts,its application is limited.Magnetic drive piston compressors that combine magnetic drive technology with piston compressors can not only reduce the vibration and noise generated during the working process of the piston compressor,but also improve the service life of parts to a certain extent.This paper takes the magnetic drive piston compressor as the research object,aiming to study the working characteristics of its key components,analyze whether the working characteristics of the parts meet the requirements and study the transmission performance of the magnetic coupling,the specific work is as follows:Firstly,the vibration problem of magnetic drive piston compressor is studied,the finite element model of the compressor is constructed based on the basic theory of finite element and modal analysis theory,the finite element mode analysis of the compressor system is completed,and the natural frequency and modal mode shape of the compressor are obtained.Then,the experimental data of the compressor is obtained through the test,and the modal parameters under the test mode are obtained by analyzing and processing the test data.Next,the finite element modal parameters are compared with the experimental modal analysis data.The results show that the vibration frequency error of the two is within 15%,which is within a reasonable range.Finally,the finite element mode shape is analyzed to provide reference and direction for subsequent part structure analysis.Secondly,on the basis of the modal mode shape analysis in the first chapter,the characteristics of the connecting rod are analyzed.The force analysis of the connecting rod was carried out,and then the force curves of the large head and the small head of the connecting rod were calculated by MATLAB,the boundary conditions of the connecting rod were determined,the stress cloud and deformation cloud were obtained by static analysis of the connecting rod,and the fatigue life diagram and safety factor cloud were derived based on static analysis,and the results showed that the secondary connecting rod had an infinite life.Again,on the basis of the modal mode shape analysis in the first chapter,the characteristics of the crankcase are analyzed.Based on the working principle and structural characteristics of the crankcase,the dynamic balance analysis of the crankcase working condition is carried out,the load boundary conditions are determined,and then the vibration response analysis of the crankcase is carried out,and the vibration displacement of all parties of the crankcase is obtained,and the maximum displacement of the vibration is compared with the specified standard,and the results show that the compressor meets the vibration regulations of the vibration national standard GB7777-2003.Finally,based on Maxwell’s electromagnetic field theory,the transmission performance of the magnetic transmission piston compressor is analyzed.The magnetic circuit and structural parameters of the magnetic coupling are designed,and the influence of the working air gap and the rotational eccentricity of the inner and outer magnetic rotor on the field strength of the air layer of the magnetic coupling is studied by Maxwell software,and the results show that the field strength of the magnetic coupler decreases with the increase of the working air gap,and the rotational eccentricity also has a certain influence on the field strength. |
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