Patent ID: 6560996
Filing Date: 2003-05-13
Classification: C03B,Y02P

Abstract:
A vacuum degassing apparatus for molten glass, comprising:a vacuum housing which is evacuated to be depressurized therein; a vacuum degassing vessel made of refractory material, which is provided in the vacuum housing to vacuum-degas molten glass; an uprising pipe made of refractory material, which connects to the vacuum degassing vessel in the vacuum housing, and sucks and draws up undegassed molten glass to introduce the undegassed molten glass into the vacuum degassing vessel; a downfalling pipe made of refractory material, which connects to the vacuum degassing vessel in the vacuum housing and draws down the degassed molten glass from the vacuum degassing vessel to discharge the degassed molten glass; an upstream pit located under a lower edge of the uprising pipe and which supports the vacuum housing and the uprising pipe and connects to the uprising pipe; a brick receiver between the uprising pipe and the upstream pit; and a downstream pit located under a lower edge of the downfalling pipe and which supports the vacuum housing and the downfalling pipe and connects to the downfalling pipe; wherein the lower edge of the uprising pipe and the lower edge of the downfalling pipe are positioned at a lower level than a liquid level of the undegassed molten glass when depressurization starts.