Asahi Glass Company, Limited

Agc Inc.

Hiroaki Hamamoto

Michito Sasaki

Hajime Itoh

Wataru Miyoshi

Kensuke Nagai

Takahiro Nagata

Toru Nishikawa

Rei Kitamura

Hironobu Yamamichi

Shuji Kabashima

Suguru Kobayashi

Toshiyuki Uematsu

Housaku Yonetsu

Takashi Kubo

Kazuo Ninomiya

Takahisa Nagata

Satoshi Abiko

There are provided a conduit structure for molten glass, a vacuum degassing apparatus using the conduit structure, and a process for vacuum-degassing molten glass by use of the vacuum degassing apparatus, wherein without using a cooling system, solid thermal insulating materials constituting a backup for the conduit are prevented from being corroded by molten glass oozing out of a joint between adjacent fused cast refractories constituting the conduit, and wherein production cost is reduced. A conduit structure for molten glass, comprising a conduit and a backup disposed around the conduit; the conduit being a hollow pipe made of fused cast refractories disposed in longitudinal and circumferential directions thereof; the backup comprising a refractory layer outside the conduit, and a thermal insulating material layer disposed outside the refractory layer; the refractory layer including a refractory brick layer made by placing refractory bricks along the longitudinal and circumferential directions of the conduit, and a monolithic refractory layer formed by placing a monolithic refractory containing from 30 to 100% of AlOand from 0 to 70% of SiOin percent by mass on an oxide basis and sintering the monolithic refractory;

Molten glass conduit structure, and device and method using conduit structure

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.

Vacuum degassing apparatus, apparatus for producing glassware, and method for producing glassware

A conduit structure for molten glass, in which molten glass is flown through a double-pipe structure, with little stress loading even for a long time operation. A supporting rib connecting an inner pipe and an outer pipe is employed in the double pipe structure having the inner pipe and outer pipe in the conduit structure for molten glass, wherein excessive stress concentration hardly occurs in an inner pipe-joint portion, an outer pipe-joint portion and the rib when the rib is applied with a stress load due to the weight of the inner pipe.

Conduit structure for molten glass, vacuum degassing apparatus, vacuum degassing method for molten glass and process for producing glass products employing said conduit structure

A vacuum degassing apparatus having a throughput of at least 200 tons/day without causing problems such as a stagnation of molten glass flow in the molten glass flow path, an increment of flow rate of the molten glass flow in a local area, an excessive increment of pressure loss of the molten glass flow. A vacuum degassing apparatus comprises a vacuum degassing vessel, and an uprising pipe and a downfalling pipe which are connected with the vacuum degassing vessel, wherein the vacuum degassing vessel includes a wide portion for providing a molten glass flow path, and in the wide portion, the proportion W/Lof the breadth of molten glass flow path Wto the length of molten glass flow path Lis at least 0.2 and that in the vacuum degassing vessel, the breadth of molten glass flow path Wof the portion connected with the uprising pipe and the breadth of molten glass flow path Wof the portion connected with the downfalling pipe are narrower than the breadth of molten glass flow path Win the wide portion, and the position of the bottom of molten glass flow path of the portion connected with the uprising pipe and the position of the bottom of molten glass flow path of the portion connected with the downfalling pipe are lower than the position of the bottom of molten glass flow path of the wide portion.

Vacuum degassing apparatus, apparatus for producing glass products and process for producing glass products

Growing community of inventors

Tokyo, Japan

Hiroaki Hamamoto