Stress And Deformation Analysis Of Oil-Free Air Scroll Compressor

The advantages of a lightweight,simple structure,low sound,operating reliability,high volume efficiency,design and construction,and a wide variety of manufacturing and life applications are the popular uses of scroll compressors in refrigeration,air conditioning,and gas compression applications.However,pure gas,which needs no lubricant oil to engage in a compression process,must be used on special occasions such as food processing,refrigeration,textile processing,medical equipment,and other fields.In view of the scroll compressor’s existing research situation,a new kind of oil-free air scroll compressor prototype was built.In the operating phase,the geometric theory,mathematical model,and analysis of oil-less air scroll compressor were studied in-depth,scrolls were simulated transiently,and the mesh scroll teeth were examined for stress and deformation distribution.Finally,the output parameters of the prototype are calculated to assess the accuracy of the machine model.(1)The equation of a scroll profile was defined based on the prototype geometric parameters.The working chambers’ volume and volume change rate were resolved and determined by a number of separated working chambers.The change law with the rotation angle on the shaft was obtained for the working chamber’s entire volume.It is also measured the theoretical displacement of the scroll compressor.The gas force and torque are measured when rotating,and static scrolls of the scroll compressor and gas and torque law are calculated using the main shaft’s rotary angle.(2)Following the 3D prototype model,the heat transfer and leakage model were taken respectively from the beginning of the suction until the end of the exhaust.Under actual working conditions,a complete mathematical model was built.The software’s Fortran and MATLAB programmed by the Euler principle to obtain pressure,volume,exhaust temperature,and mass flow through the adjustments in shaft angle.By calculating the established thermodynamic model,it is concluded that the heat transfer influences the pressure and change in temperature most,whereas leakage has the most considerable influence on changes in efficiency.The oilfree scroll compressors have better capacity relative to oil scroll compressors.(3)Finite element method analysis is carried out with an oil-less air scroll compressor based on thermal,structural,thermostatic loading simulations,and physical constraints.The stresses and deformation of the scrolls and the static and dynamic phenomenon of scroll compressors were studied.The scroll considers both the actual and simplified operating load conditions.The temperature distribution is obtained by thermal load conditions,while thermal,structural,and thermo-static boundary conditions are employed to obtain Von-misses stress and deformation of the fixed and moving scroll—research analysis of the law of stress and deformation in the meshing condition of scrolls.The findings illustrate that the fluid’s motion is by the scroll’s rotating direction,and a little leakage can occur at the meshing gap.Every chamber’s temperature distribution is not sufficiently uniform.The temperature indicates upward patterns from the intake area to the central exhaust area—the load of the temperature influences the stress and deformation of the scroll teeth.(4)The test platform was designed to assess the prototype performance parameters.The variance in power,exhaust volume,and exhaust temperature with exhaust pressure was measured at different rotational speeds.The simulation’s accuracy is further checked by matching the test findings with the simulated results,which provides some data support for the further analysis of the oil-less air scroll compressor.