(57) An expander-integrated compressor 200A includes a closed casing 1, a compression
mechanism 2, an expansion mechanism 3, a shaft 5, an oil pump 6, and a heat insulating
structure 30A. The oil pump 6 is disposed between the compression mechanism 1 and
the expansion mechanism 3, and draws, via an oil suction port 62q, an oil held in
an oil reservoir 25 to supply it to the compression mechanism 2. The heat insulating
structure 30A is disposed between the oil pump 6 and the expansion mechanism 3, and
limits a flow of the oil between an upper tank 25a, in which the oil suction port
62q is located, and a lower tank 25b, in which the expansion mechanism 3 is located,
so as to suppress heat transfer from the oil filling the upper tank 25a to the oil
filling the lower tank 25b
.
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