SCREW COMPRESSOR AND CHILLER UNIT PROVIDED WITH SAME

摘要

A screw compressor in which it is possible to achieve size reduction and reduce the oil rate and a chiller unit equipped with the screw compressor are provided. In the screw compressor, an oil separator includes: an outer cylinder; an inner cylinder positioned inside the outer cylinder; and an introducing flow path that lets refrigerant discharged from a compression working chamber flow in so that the refrigerant swirls to the circumferential direction on the inner wall surface of the outer cylinder. The upper end portion of the inner cylinder is held by the oil separator and the outer wall of the inner cylinder is thereby held independently of the inner wall of the outer cylinder. The diameter of the inner wall of the outer cylinder is so configured that the diameter is gradually reduced along the swirl flow path in which refrigerant that flowed in through the introducing flow path swirls. The refrigerant that flowed in through the introducing passage swirls and goes down along the swirl flow path which is the inner wall of the outer cylinder and is thereby separated into gas refrigerant and oil. Thereafter, the separated gas refrigerant flows from the lower end portion of the inner cylinder into the inner cylinder and goes up; and the separated oil flows down along the inner wall surface of the outer cylinder.