| 摘要 |
It is an object of the present invention to provide a vacuum degassing apparatus configured so as to be capable of carrying out more simply exchange operation for an extension pipe made of heat-resisting metal and immersed in molten glass. The present invention includes a vacuum housing, a vacuum vessel, an introduction pipe and a discharge pipe which are assembled by a plurality of bricks, and an extension pipe connected to at least one of the introduction pipe and the discharge pipe and made of heat-resisting metal. The extension pipe is constituted by a base end portion, a body portion formed so as to be continuous to the base end portion, and a sealing flange extending from an outer peripheral side of the body portion at a position where one end of at least one of the introduction pipe and the discharge pipe is connected to a through hole formed in an outer wall of the vacuum housing. The extension pipe is detachably fixed to the outer wall through a fixing structure disposed on an outer peripheral portion of the sealing flange, at a position where the extension pipe has the base end portion placed into an end brick constituting an opening in one end of the introduction pipe or an opening in one end of the discharge pipe and where the sealing flange covers through holes formed in the outer wall. |
