Rotary type expander and fluid machinery

摘要

A rotary type expander ( 60 ) is provided with two rotary mechanism parts ( 70, 80 ). These two rotary mechanism parts ( 79, 80 ) differ from each other in displacement volume. The outflow side of the first rotary mechanism part ( 70 ) of small displacement volume is fluidly connected to the inflow side of the second rotary mechanism part ( 80 ) of large displacement volume. In addition, the process in which the volume of a first low-pressure chamber ( 74 ) in the first rotary mechanism part ( 70 ) decreases is in synch with the process in which the volume of a second high-pressure chamber ( 83 ) in the second rotary mechanism part ( 80 ) increases. Refrigerant at high pressure is first introduced into a first high-pressure chamber ( 73 ) of the first rotary mechanism part ( 70 ). Thereafter, this high-pressure refrigerant passes through a communicating passage ( 64 ) and then flows by way of the first low-pressure chamber ( 74 ) into the second high-pressure chamber ( 83 ) while expanding. The after-expansion refrigerant flows out to an outflow port ( 35 ) from a second low-pressure chamber ( 84 ) of the second rotary mechanism part ( 80 ).