REFRIGERATION DEVICE

摘要

An air conditioner (1) using carbon dioxide as the refrigerant has a two-stage compression type compression mechanism (2), a heat source-side heat exchanger (4), an expansion mechanism (5), a utilization-side heat exchanger (6), an intermediate cooler (7) provided in an intermediate refrigerant tube (8) for causing a refrigerant discharged from a front-stage compression element to be sucked by a rear-stage compression element and functioning as a cooler for the refrigerant discharged from the front-stage compression element and sucked into the rear-stage compression element, and an intermediate oil separation mechanism (16) provided at a portion between the front-stage compression element of the intermediate refrigerant tube (8) and the entrance of the intermediate cooler (7), and separating refrigeration machine oil entrained in the refrigerant discharged from the front-stage compression element and returning the separated oil to the suction side of the compression mechanism (2).