Patent ID: 8857211

Claim:
An injectable two-staged rotary compressor for use in a heat pump system that employs an injection refrigerating cycle, the rotary compressor comprising: a sealed container; a lower stage compressing unit; an upper stage compressing unit; a motor configured to drive the lower stage compressing unit and the upper stage compressing unit; a first suction pipe that is connected to a suction side of the lower stage compressing unit and configured to lead a low-pressure refrigerant of the injection refrigerating cycle to the lower stage compressing unit; an interconnecting path that connects a discharging side of the lower stage compressing unit to a suction side of the upper stage compressing unit; a discharging pipe that is connected to the sealed container, and configured to discharge a high-pressure refrigerant, discharged into the sealed container from the upper stage compressing unit, into the injection refrigerating cycle; and a second suction pipe configured to lead an intermediary-pressure injected refrigerant that is a wet refrigerant from the injection refrigerating cycle to the interconnecting path, wherein the second suction pipe is extended into the sealed container and is provided with a heat-exchange promoting unit configured to promote exchange of heat between the intermediary-pressure injected refrigerant and an internal space of the sealed container in such a manner that the high-pressure refrigerant is cooled by exchanging heat with the intermediary-pressure injected refrigerant, the heat-exchange promoting unit being a part of the second suction pipe arranged in the high-pressure refrigerant discharged from the upper stage compressing unit in the sealed container.