Vacuum degassing apparatus and vacuum degassing method for molten glass
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0600925
(2012-08-31)
|
등록번호 |
US-8468851
(2013-06-25)
|
우선권정보 |
JP-2008-046247 (2008-02-27) |
발명자
/ 주소 |
- Nishikawa, Toru
- Yamamichi, Hironobu
- Koyama, Tetsuya
- Endo, Yuji
- Itoh, Hajime
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출원인 / 주소 |
- Asahi Glass Company, Limited
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대리인 / 주소 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
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인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
▼
A vacuum degassing apparatus for molten glass is comprised of an uprising pipe, a vacuum degassing vessel, a downfalling pipe, an upstream side pit that supplies molten glass to the uprising pipe, and a downstream side pit that receives molten glass from the downfalling pipe. The vacuum degassing ap
A vacuum degassing apparatus for molten glass is comprised of an uprising pipe, a vacuum degassing vessel, a downfalling pipe, an upstream side pit that supplies molten glass to the uprising pipe, and a downstream side pit that receives molten glass from the downfalling pipe. The vacuum degassing apparatus for molten glass is further comprised of a separating mechanism that separates a part of molten glass moving from the downfalling pipe to the downstream side pit, and a returning pipe that returns separated molten glass to the upstream side pit.
대표청구항
▼
1. A vacuum degassing method for molten glass, comprising: passing molten glass through a vacuum degassing vessel inside of which is maintained in a vacuum state;separating a boundary laminar flow of the molten glass flown out from the vacuum degassing vessel; andreturning the separated boundary lam
1. A vacuum degassing method for molten glass, comprising: passing molten glass through a vacuum degassing vessel inside of which is maintained in a vacuum state;separating a boundary laminar flow of the molten glass flown out from the vacuum degassing vessel; andreturning the separated boundary laminar flow of the molten glass to the vacuum degassing vessel. 2. The vacuum degassing method for molten glass according to claim 1, wherein an amount of the separated boundary laminar flow of the molten glass is at least 0.1% and at most 10% of an amount of the molten glass passing through the vacuum degassing vessel. 3. The vacuum degassing method for molten glass according to claim 1, wherein an amount of the separated boundary laminar flow of the molten glass is at least 1% and at most 5% of an amount of the molten glass passing through the vacuum degassing vessel. 4. The vacuum degassing method for molten glass according to claim 1, wherein the passing comprises changing a ratio of an amount of the separated boundary laminar flow of the molten glass to an amount of the molten glass passing through the vacuum degassing vessel while the molten glass is passed through the vacuum degassing vessel. 5. The vacuum degassing method for molten glass according to claim 1, further comprising heating the separated boundary laminar flow of the molten glass before the returning of the separated boundary laminar flow of the molten glass to the vacuum degassing vessel. 6. The vacuum degassing method for molten glass according to claim 1, further comprising stirring the separated boundary laminar flow of the molten glass before the returning of the separated boundary laminar flow of the molten glass to the vacuum degassing vessel. 7. A method of manufacturing a glass product, comprising: melting a glass material in a melting furnace to obtain molten glass;passing the molten glass through a vacuum degassing vessel inside of which is maintained in a vacuum state;separating a boundary laminar flow of the molten glass flown out from the vacuum degassing vessel;returning the separated boundary laminar flow of the molten glass to the vacuum degassing vessel; andsupplying a remaining flow of the molten glass flown out from the vacuum degassing vessel to a forming apparatus configured to shape the molten glass. 8. The method according to claim 7, wherein an amount of the separated boundary laminar flow of the molten glass is at least 0.1% and at most 10% of an amount of the molten glass passing through the vacuum degassing vessel. 9. The method according to claim 7, wherein an amount of the separated boundary laminar flow of the molten glass is at least 1% and at most 5% of an amount of the molten glass passing through the vacuum degassing vessel. 10. The method according to claim 7, wherein the passing comprises changing a ratio of an amount of the separated boundary laminar flow of the molten glass to an amount of the molten glass passing through the vacuum degassing vessel while the molten glass is passed through the vacuum degassing vessel. 11. The method according to claim 7, further comprising heating the separated boundary laminar flow of the molten glass before the returning of the separated boundary laminar flow of the molten glass to the vacuum degassing vessel. 12. The method according to claim 7, further comprising stirring the separated boundary laminar flow of the molten glass before the returning of the separated boundary laminar flow of the molten glass to the vacuum degassing vessel. 13. The method according to claim 7, wherein the molten glass flown out from the vacuum degassing vessel is passed through a downfalling pipe attached to the vacuum degassing vessel and through a conduit structure positioned on a downstream side of the downfalling pipe, the conduit structure has a double pipe structure comprising an inner pipe and an outer pipe, the outer pipe has a closed end and a side wall that has an opening, and the separating comprises causing the boundary laminar flow of the molten glass to flow through the opening provided on the side wall of the outer pipe, and causing the remaining flow of the molten glass flown out from the vacuum degassing vessel to flow through the inner pipe. 14. The method according to claim 13, wherein the remaining flow is passed through an open end of the inner pipe such that the remaining flow flows in a downstream direction. 15. The method according to claim 13, further comprising forming a two-layer flow in an uprising pipe connected to the vacuum degassing vessel, the two-layer flow includes a lower flow and an upper flow, the lower flow comprises the boundary laminar flow flown through the opening provided on the side wall of the outer pipe, and the upper flow comprises newly supplied molten glass. 16. The method according to claim 7, wherein the molten glass flown out from the vacuum degassing vessel is passed through a downfalling pipe attached to the vacuum degassing vessel and received in a downstream side pit connected to the downfalling pipe, the separated boundary laminar flow of the molten glass is returned to the vacuum degassing vessel through a returning pipe connected to the downstream side pit at an opening, and the opening of the returning pipe satisfies (1) and (2), and separates the boundary laminar flow of the molten glass flown out from the vacuum degassing vessel: (1) the opening crosses a part of an imaginary area obtained by imaginarily extending the downfalling pipe in a downstream direction; and(2) the opening does not cross an imaginary line obtained by imaginarily extending a central axis of the downfalling pipe in the downstream direction. 17. The method according to claim 16, wherein a minimum distance dmin between the returning pipe and the imaginary line, and a radius Ddown of the downfalling pipe, satisfy: 0
이 특허에 인용된 특허 (4)
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Trevelyan Robert E. (Wigan GBX) Whitfield Peter J. (St. Helens GBX), Glass melting furnace with control of the glass flow in the riser.
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Takeshita Shinji,JPX ; Tanaka Chikao,JPX ; Ishimura Kazuhiko,JPX, Refining method for molten glass and an apparatus for refining molten glass.
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Yusuke Takei JP; Masataka Matsuwaki JP; Toshiyasu Kawaguchi JP; Takashi Kijima JP; Atsushi Tanigaki JP; Katsuharu Imamaki CN; Michito Sasaki JP; Toshihiro Ishino JP, Vacuum degassing apparatus for molten glass.
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Ishimura Kazuhiko,JPX ; Saito Fumiaki,JPX ; Yoshikawa Masaaki,JPX ; Okada Misao,JPX ; Nakajima Shinsuke,JPX, Vacuum degassing method and its apparatus.
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