Strength Analysis Of A Orbiting Scroll Under The Action Of Multi Field Coupling

The scroll is the core component of the scroll compressor to compress the gas.When the compressor is working,gas load,temperature load and inertial force load act on the scroll.The stress and strain distribution of the scroll under the action of each load has an important influence on the stability,efficiency and service life of the compressor.The establishment of reasonable and accurate load models is one of the key issues to study the stress-strain distribution law and influence of the scroll under the coupling of multiple loads.First of all,in this paper,based on the structural characteristics of the scroll compressor and the thermal working process,the nonlinear temperature distribution model of the scroll is constructed.The flow area of the compressed cavity gas is divided into two parts.By solving the temperature of the main turbulent area of the gas,the temperature of the bottom layer of the laminar flow is obtained by using the Fourier heat conduction formula,and then the temperature of the bottom layer of the laminar flow is equivalent to the wall temperature of the vortex tooth to establish a nonlinear temperature load model of the dynamic vortex disk which is closer to the actual working condition.Secondly,the finite element method is used to solve the stress-strain law of the orbiting,static and assembled scroll plates under the nonlinear temperature load,gas force load,inertia load and multi field coupling load.According to the stress caused by the three kinds of loads,the stress caused by the gas load is the largest.But from the point of deformation,the temperature load causes the largest deformation;the application of the nonlinear temperature load makes the deformation of the orbiting scroll significantly increase,which shows that the load has the greatest impact on scroll performance.The maximum deformation caused by the gas load occurs in the second compression chamber;the inertia load causes the smallest deformation on the scroll,which is several orders of magnitude smaller than other loads.The application of temperature load has an impact on the total distribution of the scroll teeth,making the maximum deformation position move from the second compression chamber to the top of the central chamber.Thirdly,the stress-strain analysis of the static scroll and the assembled scroll under nonlinear temperature load,gas force load and coupling load is carried out.It is found that the overall deformation of the static scroll decreases due to the existence of the heat sink,and the stress-strain declines to a large extent due to the interference between the two scroll plates after assembling.Finally,the axial and radial deformation laws of different materials are compared.In this paper,the radial and axial deformation of the tip and root of the scroll made of cast iron,cast copper and cast aluminum under temperature load,gas force load and coupling load are analyzed.The results show that the deformation trends of the three materials are the same under various loads.The deformation of the scroll made ofcast aluminum is larger than that of the other two materials.The scroll made of cast iron has the smallest deformation and the smallest gap under various loads,which is the most suitable material for making the scroll.In this paper,the temperature load mode of scroll is improved,the stress-strain law of single scroll and assembly under different loads is solved closer to the actual working condition,and the deformation of different material scroll under various loads is analyzed and compared,which has important theoretical and engineering guiding significance for the design and material selection of scroll.