According to the tangential force of crank pin approximately for radial force four times, between the radial gas force F-r and tangential gas force F-t acting on the orbiting scroll, the radial force is invariableness with the spindle rotation angle, but tangential force F-t with the spindle rotation angle changes, and in the discharge angle theta* at maximum. As a result of our comprehensive analyses to loads at crankshaft bearing of the scroll compressor as well as installation angle of the counter weight and mass of the counterweight, it is concluded that the imbalance residual quantity of the crank pin tangential force effects on crankshaft bearing and radial force acting on the crank pin, which results from gas force of orbiting scroll, is balanced, and the vibration of the scroll compressor is decreased. This paper puts forward a set of formulas, which are derived based on analysis of the loads at crankshaft of scroll compressor. The formulas can be used to determine the parameters of installation angle of the counterweight and the force of loads at crankshaft for scroll compressor.
