Patent ID: 9568003
Date: 2017-02-14
CPC Classifications: B01D,F04C,F25B

Claim:
1. A screw compressor comprising: a male rotor and a female rotor whose rotating shafts are parallel to each other and which are rotated in engagement with each other, forming a compression working chamber; and an oil separator into which refrigerant discharged from the compression working chamber flows and which separates the refrigerant into refrigerant gas and oil, wherein the oil separator includes: an outer cylinder; an inner cylinder located inside the outer cylinder; and an introducing flow path letting refrigerant discharged from the compression working chamber flow in so that the refrigerant swirls to a circumferential direction on an inner wall surface of the outer cylinder, wherein an upper end portion of the inner cylinder is held by the oil separator and an outer wall of the inner cylinder is thereby held independently of the inner wall of the outer cylinder, wherein a diameter of an inner wall of the outer cylinder is so configured that the diameter is gradually reduced along a swirl flow path in which refrigerant that flowed in through the introducing flow path swirls, wherein refrigerant that flowed in through 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 flowing from a lower end portion of the inner cylinder into the inner cylinder and going up and the separated oil flowing down along the inner wall surface of the outer cylinder, and wherein an outlet portion of the introducing flow path has a portion of a contraction of pass protruded from a center of the outer cylinder toward the inner wall of the outer cylinder.