Oil-return device for scroll compressor and scroll compressor

The embodiment of the invention provides an oil-return device for a scroll compressor. The scroll compressor comprises a medium-pressure cavity, which is a cavity surrounded by a hub of a dynamic scroll plate and a part of a frame. The scroll compressor also comprises an actuating mechanism used for driving the scroll compressor. Sliding bearings are adopted between the actuating mechanism and frame, and between the actuating mechanism and the hub of the dynamic scroll plate. Oil on the hub of the dynamic scroll plate flows out of the frame through an oil-return passage in the frame. Furthermore, the embodiment of the invention provides another oil-return device, and a scroll compressor using the oil-return device.