US4122295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace wall structure capable of tolerating high heat load for use in electric arc furnace
Assignee: IHI Corp
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Filing: 1977-01-04
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Granted: 1978-10-24
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Expires: 1997-01-04
Abstract
Abstract Disclosed is a furnace wall structure which is placed in opposed relation with electrodes of a electric arc furnace and is made of copper or copper alloy in order to ensure a long service life, improved safety and a minimum thermal loss and in which a front plate which defines a heat-receiving surface exposed within the furnace is cooled by the forced circulation of cooling water.
Inventors
- 👤 Toshio Nanjyo
- 👤 Akinori Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:44
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; F; F27; F27B; F27B3/00; F27B3/10; F27B3/12; F27D; F27D1/00; F27D1/12; F27D9/00; F27D2009/0002; F27D2009/004; F27D2009/0056; F27D2009/0062
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
54 words
A high-heat-load furnace wall structure for an electric arc furnace wherein a cooling water passage is provided at the rear surface of a front plate of a main body which is made of copper or copper alloy and which is exposed in the furnace, and cooling water is circulated through said cooling water passage.
Claim 2
Dependent Claim
54 words
A high-heat-load furnace wall structure for an electric arc furnace wherein a cooling water passage is provided at the rear surface of a front plate of a main body which is made of copper or copper alloy and which is exposed in the furnace, and cooling water is circulated through said cooling water passage.
Claim 3
Dependent Claim
45 words
A high-heat-load furnace wall structure as set forth in claim 1 wherein a thermal conductivity and a thickness of said front plate are so selected that said front plate may have a thermal resistance from (0.5 to 1.5) × 10 -4 m 2 ·h° C./Kcal.
Claim 4
Dependent Claim
66 words
A high-heat-load furnace wall structure as set forth in claim 2 wherein poles pieces each made of a magnetic material and having a sufficient area are disposed within the cooling water passage, an electromagnet is disposed outwardly of said main body, and the cooling water is made to flow at a high flow rate between said pole pieces and the rear surface of said front plate.
Claim 5
Dependent Claim
23 words
A high-heat-load furnace wall structure as set forth in claim 1 wherein the heat-receiving surface of said front plate is formed with ledges.
Claim 6
Dependent Claim
23 words
A high-heat-load furnace wall structure as set forth in claim 2 wherein the heat-receiving surface of said front plate is formed with ledges.
Claim 7
Dependent Claim
23 words
A high-heat-load furnace wall structure as set forth in claim 3 wherein the heat-receiving surface of said front plate is formed with ledges.
Claim 8
Dependent Claim
41 words
A high-heat-load furnace wall structure as set forth in claim 1 wherein the heat-receiving surface of said front plate is coated with a metal, cement or ceramic having a high melting temperature at least higher than the melting temperature of copper.
Claim 9
Dependent Claim
41 words
A high-heat-load furnace wall structure as set forth in claim 2 wherein the heat-receiving surface of said front plate is coated with a metal, cermet, or ceramic having a high melting temperature at least higher than the melting temperature of copper.
Claim 10
Dependent Claim
41 words
A high-heat-load furnace wall structure as set forth in claim 4 wherein the heat-receiving surface of said front plate is coated with a metal, cermet, or ceramic having a high melting temperature at least higher than the melting temperature of copper.
Claim 11
Dependent Claim
41 words
A high-heat-load furnace wall structure as set forth in claim 5 wherein the heat-receiving surface of said front plate is coated with a metal, cermet or ceramic having a high melting temperature at least higher than the melting temperature of copper.
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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |