Expansion and compression all-in-one machine capable of continuously adjusting working conditions based on rotating speed coupling

The invention discloses an expansion and compression all-in-one machine capable of continuously adjusting working conditions based on rotating speed coupling. The expansion and compression all-in-one machine comprises an outer shell, an expansion scroll plate, a compression scroll plate, a planetary gear and a motor. The outer shell is divided into an upper part and a lower part, an expansion scroll plate, a planetary gear and a compression scroll plate are sequentially arranged in the upper half part in the axial direction, and the outer shell is further provided with two air inlets, two air outlets and two pressure adjusting openings. The lower half part is provided with a driving motor connected with the planetary gear, and the expansion scroll plate and the compression scroll plate are connected with the planetary gear. Vortex expansion and vortex compression are adopted, so that the structure is more efficient and compact; through the elastic design of the static disc vortex, the expansion ratio/compress