Patent ID: 9505645
Filing Date: 2016-11-29
CPC Classification: C03B

Claim Text:
1. A vacuum degassing apparatus for molten glass, comprising: a vacuum housing; a vacuum vessel disposed in the vacuum housing such that molten glass is introduced into the vacuum vessel; an introduction pipe positioned in the vacuum housing and connected to an upstream side of the vacuum vessel such that the molten glass is introduced into the vacuum vessel; a discharge pipe positioned in the vacuum housing and connected to downstream side of the vacuum vessel such that the molten glass is discharged from the vacuum vessel; and an extension pipe connected to at least one of an upstream end of the introduction pipe and a downstream end of the discharge pipe and extending through a through hole formed in an outer wall of the vacuum housing, wherein the extension pipe is made of heat-resisting metal and has a base end portion formed on one end close to the vacuum vessel, a body portion formed continuous to the base end portion, and a sealing flange extending outward from an outer periphery of the body portion and mounted to the outer wall of the vacuum housing such that the sealing flange is covering the through hole in the outer wall, the extension pipe is detachably fixed to the outer side of the outer wall through a fixing structure disposed on of the sealing flange such that the base end portion of the extension pipe is received in an opening formed at the upstream end of the introduction pipe or the downstream end of the discharge pipe, and the sealing flange contacts with the outer wall.