| 摘要 |
A sealing device (1) is arranged around a rod electrode (4) ex-tending vertically through an aperture (3) made in the ceiling (2) of an arc fur-nace and being vertically movable inside the furnace to prevent the access of gases from the furnace through the aperture (3) to the atmosphere, and on the other hand to prevent air from flowing from the atmosphere into the furnace. The sealing device comprises a gas distribution chamber (5) provided with an inlet channel (6) for feeding essentially passive gas, such as nitrogen or air, into the gas distribution chamber. The sealing device also includes a slit noz-zle (7) encasing the electrode, through which nozzle a gas jet is arranged to be discharged from the gas distribution chamber (5) towards the electrode (4) in a direction that is at an angle (a) with respect to the horizontal plane and has a slightly upwards inclined orientation, and that is, with respect to the furnace interior, pointed outwardly, so that the sealing is carried out owing to the ef-fect of the created stagnation pressure. |
