| 摘要 |
<p>A vacuum degassing apparatus (10,310) for refining molten glass (G) under reduced pressure comprises a vacuum housing (12,312), a vacuum degassing vessel (14,314), an uprising pipe (16,316), a downfalling pipe (18,318) and an upstream (22,322) and downstream pit (24,324) connecting to the uprising and downfalling pipes respectively and which support the vacuum housing. The lower edges of the uprising and downfalling pipes are positioned at such a level so that in use said level is lower than the intended liquid level of the undegassed molten glass upstream thereof. The vacuum degassing vessel (14,314), the uprising pipe (16,316) and the downfalling pipe (18,318) are made of refractory material. <IMAGE></p> |
