Method and apparatus for refining of glass melt under the influence of negative pressure.

摘要

A method for the refinement of a glass melt under reduced pressure, in which the to be refined glass melt from a riser pipe distributor (6) via a riser tube (7) is under negative pressure and which in a refining tube (11) is guided, in which the level of the glass melt (3c) significantly above the level in the riser pipe distributor, and at a distance from the end of the ascending pipe (7) in the refining tube (11) via a downpipe (15) in one case pipe distributor (16) is passed, in which the level of the glass melt (3b) for maintaining a current of the riser pipe distributor (6) via the riser tube, the refining tube (11) and the downpipe below the level of the ascending pipe distributor (6) is lowered, characterized in that, along a dividing portion (11b) between the riser pipe (7) and the downpipe (15) the melt in the refining tube (11) by means of a wholly or predominantly in the flow direction extending inner tube (31) with significantly smaller cross section in a lower flow cross section and an upper cross section of flow is divided, whereby the lower..