| 摘要 |
A vertically symmetrical mechanical stirrer adapted for submersion in a metallurgical melt includes an entrance canal in the bottom of the stirrer and at least two discharge canals in communication with the entrance canal. The community or common zone of the entrance canal and the discharge canals defines an inner mixing and degassing chamber. The entrance canal has a length which is not more than twice its inner diameter; the discharge canals have a length at least twice their average inner diameter and inner diameter of which uniformly diminish in the direction of flow from the mixing chamber to the point of discharge. The discharge canals are inclined upwardly at an angle from the horizontal of at least 10 DEG . The distance between the lowest points at the entrances to the discharge canals proximate to the mixing chamber is at least 20 percent greater than the inner diameter of the entrance canal. The exterior surfaces of the stirrer constituting a vertically symmetrical upper surface above the discharge points of the said discharge canals, and a lower surface, also vertically symmetrical, below the said points, are effectively congruent with annular torus eddies formed in the melt by the stirrer.
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