Dynamical Analysis of Scroll Compressor with the Compliant Crank Mechanism

The machining precision in the scroll compressor with the compliant crank mechanism is not required so high as that with the fixed throw crank, but the sealing performance is better than the later's, therefore the scroll compressor with the compliant crank mechanism operates at higher efficiency. In this study, the characters of the compliant crank mechanism are discussed, while the Oldham coupling and ball coupling mechanisms are separately used to restrict the orbiting scroll rotation. The movement behaviors of the orbiting scroll and the compliant crank mechanism are analysed in detail when the ball coupling mechanism is adopted, their dynamical models are developed on the basis of the force analysis. This research is useful for the optimization design of the compliant crank mechanism. INTRODUCTION When the scroll compressor operates in the ideal condition, the orbiting scroll moves around the center of the fixed scroll at a small crank radius, while its rotation is close confined, the wrap axes of two scrolls are parallel to each other, the wraps are in mesh to form the crescent shaped pockets. But in the actual situation, it is quite difficult to insure the perfect mesh, owing to the effects of the machining and installing precisions, so the leakages through the mating clearances occur, these affect the compressor performance. In order to solve this problem, some mechanisms are required, one of them is the compliant crank mechanism. The compliant crank mechanism has been analyzed in a number of papers [13] in recent years, while the Oldham coupling is adopted to restrict the rotation of the orbiting scroll. The dynamical analysis of scroll compressor with the compliant crank mechanism is carried out in this paper, while the ball coupling mechanism is used to restrict the orbiting scroll rotation.