To secure clean discharge air by providing a separator tank of a vertically long cylindrical vessel with an inner cylinder in its upper part, a gas inlet on its side surface, and a gas outlet on its upper surface, so that the center line of gas inlet on the side surface in plan view and the radial direction of the axis of the separator tank are offset.
A separator tank 5 is provided with a gas inlet 15 on the side surface of the tank 5, and a gas outlet 16 on its upper surface. The tank is constituted in such a way that, denoting by D the inside diameter of the tank 5, d1 the outside diameter of an inner cylinder 8, and x the distance between the center line of the gas inlet 15 on the side surface in plan view and the axis of the separator tank 5 respectively, d1/D is 0.4 or more, and x/D is 0.2 or more. When the discharge gas of a compressor enters the tank 5, it collides both with the inner circumferential surface of the tank 5 and with the outer circumferential surface of the inner cylinder 8, and the oil content drops due to the swirl between both surfaces. Further, when the remaining oil content enters the fiber layer of an oil separation filter, the particles of oil is aggregatedly grown, and is separated from the discharge gas.
KAMETANI HIROCHIKA
AOKI MASAKAZU
TODA MASAAKI
HITACHI SHIMIZU ENG KK