| 摘要 |
Each one of the side edges (4a, 4b) of a door (3) is arranged to run inside and along a respective tube (5a, 5b) that has a longitudinal slit (6a, 6b) and extends vertically, in that each tube is fixed in relation to the furnace, in that the tubes (5a, 5b) are designed to spring back towards a respective position in which the slit (6a, 6b) is closed, and arranged to enclose the side edge (4a, 4b) of the door (3) along essentially the whole length of the side edge (4a, 4b) when the door (3) is in its closed position, and in that a liquid coolant is arranged to stream through the tubes (5a, 5b) and essentially fill up the whole space defined by the combination of the inner surfaces of each tube (5a, 5b) and the outer surfaces of the respective side part of the door (3).
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