A Co-Rotating Scroll Compressor for Positive Displacement and Centrifugal Dual-Mode Operations

The co-rotating mechanism is utilized for scroll vacuum pump application by one of the authors.It was found that the corotating scroll compressor is transformed to a centrifugal compressor by reducing the eccentricity between the two scrolls to zero.The authors propose a co-rotating scroll compressor which works not only as a positive displacement compressor, but also as a centrifugal one in this paper.The multiple scroll warps are used in the pump section for dynamic balance, which are similar to the impellers of centrifugal compressors.Design eccentricity r is used for the positive displacement operation, and the eccentricity is used for the centrifugal operation.The basic concept is described, and the preliminary results are shown.