| 摘要 |
A dual venturi comprises: a tubular part having primary and secondary passageways separated by an internal partition therebetween, wherein a primary gas inlet is provided on the side wall of the primary passageway; a body part, located in the interior of the second passageway of the tubular part, for opening/closing the flow of secondary air by rotating in 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 damper part having a damper part-side secondary gas outlet; a driving part, connected to the side surface of the damper part by a rotational shaft, for rotationally driving the damper part in the horizontal and vertical planes; and a secondary gas inlet for introducing secondary gas into the secondary passageway of the tubular part via the damper part by means of the secondary gas inlet-side 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. |
