| 摘要 |
Provided is a dual venturi comprising: a tubular part through which air and gas pass; a body part, located in the interior of the tubular part, for opening/closing the flow of secondary air by rotating in the horizontal plane and vertical plane directions, the horizontal plane direction being the cross-sectional direction of the tubular part and the vertical plane direction being perpendicular to the horizontal plane; a central passageway, formed in the center of the body part and having a smaller diameter than the diameter of the tubular part, becoming the passageway for primary air; a damper part having a damper part-side primary gas outlet for discharging primary gas, and a damper part-side secondary gas outlet for discharging secondary gas; a driving part, connected to the side surface of the damper part via a rotational shaft, for rotationally driving the damper part in the horizontal and vertical planes; a gas inlet-side primary gas outlet connected openly to the damper part-side primary gas outlet; and a gas inlet for introducing gas into the tubular part via the damper part by means of the gas inlet-side secondary gas outlet, which openly connects selectively to the damper part-side secondary gas outlet on the basis of the rotational position of the damper part, and for forming the rotational shaft of the damper part along with the rotational shaft of the driving part. |
