Design Method of Offsetting the Orbiting Scroll and Its Influence on the Self-Rotation Characteristics of the Orbiting Scroll

In order to reduce the diameter of compressor casing of the automotive scroll compressor, the orbiting scroll is sometimes offset along a certain direction. This paper summarizes the method of offsetting the orbiting scroll, and analyses the influence of the offset amount on the self-rotation characteristics of the orbiting scroll. The theoretical calculation results show that a larger offset amount is beneficial to increase the stroke volume, however it is easy to make the orbiting scroll rotate around its driving center in the negative direction which would cause an impact on the scroll wrap and the anti-rotation mechanism. At last, this paper affords some advices in how to offset the orbiting scroll