FLUID MACHINE AND REFRIGERATION CYCLE APPARATUS

Disclosed is a fluid machine (8A) provided with an expander (4) having an expander suction hole (4a) and an expander discharge hole (4b), a compressor (6) having a compressor suction hole (6a) and a compressor discharge hole (6b), and a shaft (81) for coupling the expander (4) to the compressor (6). The expander suction hole (4a) and the compressor suction hole (6a) are opened or closed in accordance with the rotation of the shaft (81). The expander suction hole (4a) is open when the compressor suction hole (6a) is closed. The compressor suction hole (6a) is open and does not communicate with the compressor discharge hole (6b) when the expander suction hole (4a) is closed.