US Patent 11247217 Double-flow nozzle

Disclosed is a double-flow nozzle according to the present invention, the double-flow nozzle including: a body portion provided with a space portion defined at an inner side thereof; a first discharge pipe provided at the body portion and discharging a first fluid being supplied to the space portion; and a second discharge pipe discharging a second fluid while being in a state inserted into the first discharge pipe, wherein the first discharge pipe, in a state spaced apart by a predetermined gap from an outer surface of the second discharge pipe, includes a plurality of swirl-generating flow passages spaced apart by a predetermined interval from each other and arranged along a circumferential direction of the second discharge pipe.