Stress and Deformation Analyses of Scrolls of Scroll Compressor

An analysis was made for a scroll type compressor with 24-ton freezing capacity, used in air conditioning systems. In the simulation, the finite element method was employed. The scroll was assumed to be made of gray cast iron and aluminum alloy, respectively. It was also assumed that the scroll was subjected to the maximum pressure and the temperature in an extreme condition.
The results showed that the temperature gradient was the main cause of high stresses and severe deformation occurring in the scroll. The maximum stresses and deformation were at the center of the scroll. The pushing force of eccentric shaft couple with the refrigerant pressure made the scroll overturn. The tensile stresses and the compressive stresses of the gray cast iron scroll were lower than the ultimate strength of the gray cast iron. So it could be regard as a safety design. However, the maximum stress in the aluminum-alloyed scroll was closed to the yield strength of the alloy. Therefore, the thickness of the scroll blade should be increased suitably.