Abstract:  During the work of scroll compressor, due to the complex working environment and force of scroll, deformation and stress are easy to occur on it, resulting in poor sealing and fatigue damage and affecting the work efficiency and reliability of scroll compressor. Aiming at this problem, based on the finite element theory, the numerical simulation of a microminiature asynchronous scroll compressor was carried out (under various loads), and the distribution of deformation, stress and fatigue life under actual working conditions was analyzed. Firstly, the construction principle of the asynchronous suction and exhaust scroll compressor was analyzed, the structured mesh of the scroll was divided, and the elements of material, connection, constraint and load were assigned to establish the finite element calculation model of the scroll. Then, the deformation and stress distribution of the scroll under gas temperature load, gas pressure load, inertial force load and multiload coupling were analyzed respectively, and the reliability of the simulation results was analyzed. Finally, the fatigue life of the scroll under normal temperature and pressure conditions was calculated, and the variation of fatigue life under varying load conditions was studied. The results show that the gas temperature load is the main factor causing the deformation and stress of the scroll. At high suction temperature, the fatigue life of scroll plate decreases linearly with the increase of suction temperature and pressure, and the influence of the former is more obvious. At low suction temperature, the fatigue life of scroll plate decreases rapidly at high suction pressure level.
Key words:  asynchronous suction and exhaust scroll compressor; positive displacement compressor; deformation trend of scroll; stress distribution law; fatigue life; temperature load