| 摘要 |
A method and apparatus are disclosed for low-dust discharge of particulate material such as grain. The apparatus provides a nozzle having a hollow body with an inlet at the top and an outlet at the bottom. An impeller is mounted inside the body in an outwardly and downwardly flaring region below the inlet. A fluid stream of the particulate material drops through the inlet and impinges on the immpeller which deflects or throws the particles outwardly within the flaring region of the nozzle. The coarser, heavier particles have more outward momentum than the lighter, finer particles and are concentrated toward the wall of the nozzle below the impeller while the lighter, finer particles are concentrated toward the center, so that a rough separation is made and stream density is increased. A compacted downwardly moving mass is accumulated within the nozzle and is discharged through the outlet at controlled rate as a denser, relatively dust-free stream in open air. |
