US3708599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature apparatus
Assignee: Thermal Transfer Corp
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Filing: 1971-04-22
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Granted: 1973-01-02
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Expires: 1991-04-22
Abstract
Abstract A high temperature furnace unit is provided for melting metals which comprises a furnace container having at least one tuyere adjacent the bottom, at least one electrode in each such tuyere, a source of high voltage electrical current connected to said electrode capable of arc within said container, a source of combustible gas connected to each said tuyere feeding gas around the electrode at a pressure sufficient to form a pocket of gas around the electrode at the end of the tuyere.
Inventors
- 👤 W Krause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:53
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/08; C; C21; C21C; C21C5/00; C21C5/52; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
A high temperature furnace unit for melting metals comprising a furnace container, an apparatus in said furnace container for producing high temperatures therein by an electrical discharge into a gas bubble formed within said furnace and including at least one fluid cooled tuyere in the furnace container submerged in the metal in the furnace, at least one electrode in each such tuyere, a source of high voltage electrical discharge current connected to said electrode, and means supplying a combustion/reduction gas at high velocity connected to each said tuyere feeding gas through the tuyere around the electrode at a pressure sufficient to form a pocket of gas around the end of the electrode at the end of the tuyere whereby the electrode is completely surrounded by said gas and the tuyere is kept free of metal.
Claim 2
Dependent Claim
135 words
A high temperature furnace unit for melting metals comprising a furnace container, an apparatus in said furnace container for producing high temperatures therein by an electrical discharge into a gas bubble formed within said furnace and including at least one fluid cooled tuyere in the furnace container submerged in the metal in the furnace, at least one electrode in each such tuyere, a source of high voltage electrical discharge current connected to said electrode, and means supplying a combustion/reduction gas at high velocity connected to each said tuyere feeding gas through the tuyere around the electrode at a pressure sufficient to form a pocket of gas around the end of the electrode at the end of the tuyere whereby the electrode is completely surrounded by said gas and the tuyere is kept free of metal.
Claim 3
Dependent Claim
37 words
A high temperature furnace as claimed in claim 1 wherein three carbon electrodes are inserted in a tuyere in conical fashion with the three electrode axes intersecting at a point within the furnace beyond the tuyere end.
Claim 4
Dependent Claim
25 words
A high temperature furnace as claimed in claim 1 wherein the electrodes are held between feed rollers which advance and retract the electrodes as required.
Claim 5
Dependent Claim
40 words
A high temperature furnace as claimed in claim 1 wherein the electrodes are held and advanced between spaced pairs of rollers whereby two electrodes can be successively fed and controlled to provide continuous electrode control and feed to said furnace.
Claim 6
Dependent Claim
41 words
A high temperature furnace as claimed in claim 1 having a vertical shaft receiving material to be melted and provided with means for introducing hot waste gases counterflow to said scrap for preheating the same prior to its entering the furnace.
Claim 7
Dependent Claim
36 words
A high temperature furnace as claimed in claim 5 wherein the means for introducing the waste gases is at least one annular bristle pipe ring with tuyeres projecting through the stack intermediate its top and bottom.
Claim 8
Dependent Claim
33 words
A high temperature furnace as claimed in claim 1 having recuperator means utilizing the waste heat of the used combustible gases for preheating combustion air for the burners which produce the combustible gas.
Claim 9
Dependent Claim
16 words
A high temperature furnace as claimed in claim 1 wherein the combustible gases are reduction gases.
Claim 10
Dependent Claim
32 words
A high temperature furnace as claimed in claim 8 having recuperator means utilizing the waste heat of the discharged reduction gases for preheating combustion air for burners which produce the reduction gas.
Claim 11
Independent Claim
88 words
An apparatus for producing high temperatures in metals in a melting furnace by an electrical discharge into a gas bubble formed with the furnace and comprising a fluid cooled tuyere submerged in the metal in the furnace through which at least one electrode extends, said electrode being connected to a source of electrical discharge current and means supplying a combustion/reduction gas at high velocity through the tuyere around the said electrode whereby the electrode is completely surrounded by said gas and the tuyere is kept free of metal.
Claim 12
Independent Claim
88 words
An apparatus for producing high temperatures in metals in a melting furnace by an electrical discharge into a gas bubble formed with the furnace and comprising a fluid cooled tuyere submerged in the metal in the furnace through which at least one electrode extends, said electrode being connected to a source of electrical discharge current and means supplying a combustion/reduction gas at high velocity through the tuyere around the said electrode whereby the electrode is completely surrounded by said gas and the tuyere is kept free of metal.
References Cited (Backward Citations)
US3239592A
Cited
US3380904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |