Apparatus for refining molten glass under reduced pressure and method of its construction

摘要

An apparatus (10) for refining molten glass under reduced pressure comprises a vacuum degassing vessel (14) provided within a housing (12) and an uprising (16) and a downfalling (18) pipe, both connected to said vessel (14). The vacuum degassing apparatus further comprises a flow path, which in use directly contacts the molten glass, made of dense refractory bricks (32), the path including an inner surface brick layer (32a), whose refractory bricks have a flatness of 0.5mm on contacting surfaces with one anther and/or the path including a backup brick layer (32b,32c) and a ramming material filling layer (34) between the backup brick layer (32b,32c) the inner surface brick layer (32a).