EXPANDER-INTEGRATED COMPRESSOR, FREEZER, AND FREEZER OPERATION METHOD

摘要

In order to reduce the heat that travels to an expander from fluid leaked from the compressor side inside a casing of an expander-integrated compressor and in order to improve the coefficient of performance (COP) of a freezer, this expander-integrated compressor comprises: a motor; a compressor connected the output shaft of the motor; an expander connected to the output shaft of the motor; a non-contact bearing arranged between the compressor and the expander; a casing; and a gas extraction line provided so as to communicate with an area in the casing internal space that is between the compressor and the expander, said gas extraction line extracting fluid leaked from the compressor side to the expander side in the casing interior, from the area to a fluid line connected to the intake side or the discharge side of the compressor on the outside of the casing. The casing is configured such that the area is sealed from the exterior of the casing, such that the flow of fluid between the area and the outside of the casing is only some of the leaked fluid that has traveled via the gas extraction line.