US4417723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuyere for blowing gases into molten metal bath container
Assignee: Kobe Steel Ltd
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Filing: 1982-01-04
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Granted: 1983-11-29
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Expires: 2002-01-04
Abstract
Abstract A blowing tuyere to be embedded in a bottom of side wall of a molten metal bath container for blowing a gas thereinto, the tuyere including a cylindrical core body fixedly located at the center of the tuyere and an outer tube fixed concentrically around the core body with a gap of a predetermined width to form an annular blowing passage therebetween.
Inventors
- 👤 Minoru Kitamura
- 👤 Shinji Koyama
- 👤 Shuzo Ito
- 👤 Masahiko Ohgami
- 👤 Hideo Matsui
- 👤 Isamu Hirose
- 👤 Hideaki Fujimoto
- 👤 Tsuyoshi Yasui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:25
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/005; C21C5/28; C21C5/30; C21C5/35; C21C5/42; C21C5/46; C21C5/48; C21C7/00; C21C7/04; C21C7/072; C22; C22B; C22B9/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
A tuyere having a longitudinal axis, said tuyere for blowing a gas therethrough to be embedded in a bottom or side wall of a molten metal bath container, said tuyere comprising: a cylindrical core body which further comprises a solid refractory material having a first outer diameter and located at the center of said tuyere coaxially with respect to said longitudinal axis; a first tube having a second outer diameter and fixed coaxially around and immediately adjacent said core body and forming a first continuous annular gap having a first width forming a first annular blowing passage; means for reducing erosion of said wall of said molten metal bath container adjacent said tuyere; and means for stabilizing a flow rate of said gas through said tuyere over a wide range of said flow rate.
Claim 2
Dependent Claim
134 words
A tuyere having a longitudinal axis, said tuyere for blowing a gas therethrough to be embedded in a bottom or side wall of a molten metal bath container, said tuyere comprising: a cylindrical core body which further comprises a solid refractory material having a first outer diameter and located at the center of said tuyere coaxially with respect to said longitudinal axis; a first tube having a second outer diameter and fixed coaxially around and immediately adjacent said core body and forming a first continuous annular gap having a first width forming a first annular blowing passage; means for reducing erosion of said wall of said molten metal bath container adjacent said tuyere; and means for stabilizing a flow rate of said gas through said tuyere over a wide range of said flow rate.
Claim 3
Dependent Claim
23 words
A tuyere as claimed in claim 1 wherein said core body of said refractory material further exclusively comprises a substantially homogeneous core body.
Claim 4
Dependent Claim
42 words
A tuyere as claimed in claim 1 further comprising a second tube fixed coaxially around and radially outwardly from said first tube and forming a second annular gap therebetween, said second gap having a second width forming a second annular blowing passage.
Claim 5
Dependent Claim
49 words
A tuyere as claimed in claim 1 wherein said means for reducing erosion further comprises said core body and said first tube being arranged such that 0.02≦t/d≦0.08, wherein t represents said first width of said first annular gap and d represents said first outer diameter of said core body.
Claim 6
Dependent Claim
54 words
A tuyere as claimed in claim 1 wherein said means for stabilizing said flow rate further comprises said core body and said first tube arranged such that a ratio of said first outer diameter of said core body to said second diameter of said first tube lies within a range between 0.1 and 0.4.
Claim 7
Dependent Claim
54 words
A tuyere as claimed in claim 4 wherein said means for stabilizing said flow rate further comprises said core body and said first tube arranged such that a ratio of said first outer diameter of said core body to said second diameter of said first tube lies within a range between 0.1 and 0.4.
Claim 8
Dependent Claim
71 words
A tuyere as claimed in claim 6 wherein said means for reducing erosion and said means for stabilizing said flow rate each further comprises said first tube disposed about said core body such that the following structural relationship is satisfied, t/D=-0.11d/D+0.11 where t is said first width of said gap, d is said first outer diameter of said core body, and D is said second outer diameter of said first tube.
Claim 9
Dependent Claim
30 words
A tuyere as claimed in claims 1, 2, 3, 4, 5, 6 or 7, wherein said first width of said annular gap further comprises a gap smaller than 3 mm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |