Patent US3971548A successfully refreshed from Google Patents.
US3971548A
Expired / Lapsed
US
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Metallurgical furnace having a blast injection nozzle
Assignee: ABB Norden Holding AB
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Filing: 1975-03-20
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Granted: 1976-07-27
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Expires: 1995-03-20
Abstract
Abstract A metallurgical furnace has a wall contacted by molten metal and having a nozzle opening below the level of the metal, a nozzle positioned in this opening forms a passage for injecting a blast into the metal, and this nozzle has means for liquid-cooling the outer end of its blast passage to freeze the molten metal when flowing backwardly through the nozzle's passage in the event of a blast failure. In such an event, the frozen or solidified metal forms a stopper for the nozzle's passage.
Inventors
- 👤 Kare Folgero
- 👤 Lars-Gunnar Norberg
- 👤 Karl-Erik Oberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:56
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/48
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A metallurgical furnace having a wall with an inside contacted by molten metal, the wall having a nozzle opening, and a nozzle in said opening and forming a passage for injecting a blast into said metal, said nozzle having means for liquid-cooling the outer end of said passage to freeze said metal when flowing backwardly through the passage in the event of a blast failure, said nozzle opening and nozzle being conical and the nozzle being removable from the opening, the nozzle comprising a metal conical shell having an outer flange for connection with the outside of the vessel's said wall, said flange having an opening into said shell and through which a fluent refractory material can be injection molded into the shell, a pipe extending longitudinally through the shell and flange forming a blast passage.
Claim 2
Dependent Claim
136 words
A metallurgical furnace having a wall with an inside contacted by molten metal, the wall having a nozzle opening, and a nozzle in said opening and forming a passage for injecting a blast into said metal, said nozzle having means for liquid-cooling the outer end of said passage to freeze said metal when flowing backwardly through the passage in the event of a blast failure, said nozzle opening and nozzle being conical and the nozzle being removable from the opening, the nozzle comprising a metal conical shell having an outer flange for connection with the outside of the vessel's said wall, said flange having an opening into said shell and through which a fluent refractory material can be injection molded into the shell, a pipe extending longitudinally through the shell and flange forming a blast passage.
Claim 3
Dependent Claim
26 words
The furnace of claim 1 in which said means for liquid-cooling is formed by said flange being formed of metal and with a liquid-flow internal passage.
Claim 4
Dependent Claim
22 words
The furnace of claim 2 in which a plug of high thermal conductivity metal is fixed in said flange around said pipe.
Claim 5
Dependent Claim
29 words
The furnace of claim 3 in which said nozzle opening includes a liquid-cooled jacket surrounding said conical metal shell of the nozzle and from which the shell is removable.
Claim 6
Dependent Claim
71 words
The furnace of claim 4 in which the inner portion of said opening is formed by a blast stone fixed to said wall of the vessel, and a metal flange fixed to the outside of said wall and to which said jacket is fixed, has a hole through which a fluent refractory material can be injection molded around said conical shell and jacket to form the outer portion of said opening.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |