摘要:
The present invention provides a new method for airtightly joining a hollow tube made of a reinforced platinum and a flange made of platinum or a platinum alloy, which prevents decreasing of mechanical strength of the hollow tube made of a reinforced platinum due to its joining with a flange. A method for airtightly joining a hollow tube made of a reinforced platinum with a flange made of platinum or a platinum alloy, which is a method for airtightly joining the outer periphery of a hollow tube made of a reinforced platinum produced by dispersing metal oxides in platinum or a platinum alloy, with a flange made of platinum or a platinum alloy, the method comprising a step of shrink-fitting a ring made of platinum or a platinum alloy to the outer periphery of the hollow tube, a step of heating the hollow tube to which the ring is shrink-fit at from 1,150 to 1,450°C for from 1 to 10 hours, and a step of welding the flange made of platinum or a platinum alloy to the outer periphery of the ring.
摘要:
A glass melt production apparatus, which comprises a melting vessel, a vacuum degassing apparatus, a first conducting pipe structure connecting the melting vessel and the vacuum degassing apparatus, and a second conducting pipe structure to introduce a glass melt to a forming means, provided downstream the vacuum degassing apparatus; the vacuum degassing apparatus having an uprising pipe through which the glass melt from the melting vessel ascends, a vacuum degassing vessel, and a downfalling pipe through which the glass melt from the vacuum degassing vessel descends; the flow path of the glass melt in the uprising pipe, the vacuum degassing vessel and the downfalling pipe being made of a refractory material; the first conducting pipe structure having an upstream pit to supply the glass melt to the uprising pipe; and the second conducting pipe structure having a downstream pit containing the glass melt from the downfalling pipe; the glass melt production apparatus further comprising a third conducting pipe structure connecting the upstream pit and the downstream pit; and the third conducting pipe structure having a closing means to shut off a flow of the glass melt in the third conducting pipe structure; the third conducting pipe structure or the closing means having a glass melt flow path for emergencies, which allows the glass melt to pass therethrough, depending on the height of a liquid level of the glass melt in the third conducting pipe structure in the vicinity of the closing means.
摘要:
It is an object of the present invention to provide a conduit structure for molten glass, whereby even if molten glass is flown for a long time through a double-pipe structure portion comprising an inner pipe and an outer pipe joined together, stress load is little. The present invention provides a double pipe structure comprising an inner pipe and an outer pipe, wherein a supporting rib is provided between the inner pipe and the outer pipe to bridge the inner pipe and the outer pipe; wherein the supporting rib has an inner straight portion joined with the outer face of the inner pipe so as to extend along the longitudinal direction of the inner pipe, an outer straight portion joined with the inner face of the outer pipe so as to extend along the longitudinal direction of the outer pipe, and a connecting wall portion extending from the inner straight portion to the outer straight portion to integrate them; and the supporting rib has a concave portion along each of one side edge of the connecting wall portion present between one side end portion of the inner straight portion and one side end portion of the outer straight portion, and the other side edge of the connecting wall portion present between the other side end portion of the inner straight portion and the other side end portion of the outer straight portion, and reaching both side end portions of the respective straight portions via rounded portions, and the supporting rib has projecting portions formed on respective ends of the inner straight portion and respective ends of the outer straight portion.
摘要:
It is an object of the present invention to provide a conduit structure for molten glass, whereby even if molten glass is flown for a long time through a double-pipe structure portion comprising an inner pipe and an outer pipe joined together, stress load is little. The present invention provides a double pipe structure comprising an inner pipe and an outer pipe, wherein a supporting rib is provided between the inner pipe and the outer pipe to bridge the inner pipe and the outer pipe; wherein the supporting rib has an inner straight portion joined with the outer face of the inner pipe so as to extend along the longitudinal direction of the inner pipe, an outer straight portion joined with the inner face of the outer pipe so as to extend along the longitudinal direction of the outer pipe, and a connecting wall portion extending from the inner straight portion to the outer straight portion to integrate them; and the supporting rib has a concave portion along each of one side edge of the connecting wall portion present between one side end portion of the inner straight portion and one side end portion of the outer straight portion, and the other side edge of the connecting wall portion present between the other side end portion of the inner straight portion and the other side end portion of the outer straight portion, and reaching both side end portions of the respective straight portions via rounded portions, and the supporting rib has projecting portions formed on respective ends of the inner straight portion and respective ends of the outer straight portion.
摘要翻译:本发明提供一种用于熔融玻璃的导管结构的目的,由此,即使熔融玻璃通过双重管结构部,其包括上外管的内管和飞行时间长接合在一起,应力负荷是小 , 本发明提供了一种双管结构,包括上外管内管的和,worin在内管和外管以桥接所述内管和外管之间设置一个支撑肋; worin支撑肋具有上内直线部分与所述内管的外表面接合,以便沿内管的纵向方向上延伸,在外部直线部接合于外管,以便沿所述延伸的内表面 外管的长度方向,和一个连接壁部从内直线部到外直部将它们集成延伸; 和支撑肋具有沿着各内直部的一个侧端部与外侧直线部的一个侧端部,所述连接壁的另一侧边缘之间存在的连接壁部的一个侧边缘的凹部 内直线部的另一侧端部与外侧直线部的另一侧端部,并在到达通过圆形部分的respectivement直线部bothside端部分,并且所述支撑肋之间存在部分具有突出部上respectivement FORMED 外直部的内直部和各自的端部的端部。
摘要:
It is an object of the present invention to provide a vacuum degassing apparatus wherein even if bubbles of molten glass come into contact with an inner wall of an upper space of a vacuum degassing vessel to produce a molten glass flowing along the inner wall, such a molten glass can be discharged to the outside of the vacuum degassing vessel. The present invention is characterized in that the vacuum degassing vessel comprises a bottom wall portion, a side wall portion and a ceiling portion, that define a molten glass-accommodating portion and an upper space, the upper space is constituted by a combination of a plurality of crown refractories; among the plurality of crown refractories constituting the upper space, a crown refractory provided on an upper face of such a soldier refractory is disposed so that a lower portion of a face of the crown refractory facing to the inside of the vacuum degassing vessel is positioned more outside than the position of a molten-glass-contact surface of the soldier refractory, a storage portion for molten glass is formed between the upper face of the soldier refractory and a lower portion of the crown refractory disposed on the soldier refractory; and that a discharge path for molten glass communicating with the storage portion and the outside of the vacuum degassing vessel is formed, in a portion where the soldier refractory is joined with the crown refractory.
摘要:
To facilitate a preheating operation in a vacuum degassing apparatus having a flow path of a glass melt in an uprising pipe, a vacuum degassing vessel and a downfalling pipe constituted by a refractory material. Flow of a glass melt G between a melting vessel 100 and an upstream pit 210 of a first conducting pipe structure connected to a vacuum degassing vessel 320 is shut off, and in a state where the flow of the glass melt G in a by-pass 500 for the glass melt G is shut off by a first closing means 220, a combustion gas from preheating burners 530, 540 is introduced to the by-pass 500 to preheat the flow path of the glass melt G in an uprising pipe 330, the vacuum degassing vessel 320 and a downfalling pipe 340.
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.