EXPANDER-INTEGRATED COMPRESSOR, FREEZER AND FREEZER OPERATION METHOD Russian patent published in 2018 - IPC F04D29/58 

FIELD: machine building.

SUBSTANCE: expander-compressor includes a motor, a compressor, connected to an output shaft of the motor, an expander, connected to the output shaft of the motor, a non-contact bearing, disposed between the compressor and the expander, a casing or an extraction line, provided so as to be in communication with a region between the compressor and the expander in an internal space of the casing, and configured to extract, from the region, leakage fluid from a side on the compressor towards a side on the expander in the casing and send the leakage fluid to a fluid line, connected to an intake side or a discharge side of the compressor outside the casing. Casing is configured to seal the region from outside of the casing so that a flow of the at least a part of leakage fluid through the extraction line is the only fluid flow between the region and the outside of the casing.

EFFECT: invention is aimed at increasing the efficiency of a refrigeration device.

6 cl, 7 dwg