US4660808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-insulating casting tube for a metallurgical vessel
Assignee: Daussan SAS
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Filing: 1985-05-22
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Granted: 1987-04-28
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Expires: 2005-05-22
Abstract
Abstract A heat insulating casting tube is disposed between the outlet orifice of a first metallurgical vessel and a second metallurgical vessel. One end of the casting tube has a removable and substantially leaktight engagement about a casting nozzle or an adapter forming an extension of the nozzle of the first vessel. The casting tube is formed of a material sinterable under the action of the heat of the liquid metal as it flows in the tube. A ring of refractory material is disposed on the tube end engaged on and surrounding the lateral surface of the casting nozzle or adapter. The internal surface of this ring is shaped as the lateral surface of the casting nozzle or adapter and has a substantially leaktight engagement with that lateral surface. The height of the ring is such that its bottom edge is located above the zone in which the liquid metal which is poured into the tube would be liable to come into contact with the internal surface of the tube.
Inventors
- 👤 Jean-Charles Daussan
- 👤 Gerard Daussan
- 👤 Andre Daussan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:06
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/50; B22D41/502
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
243 words
In a combination comprising a heat-insulating casting tube (5) disposed between the outlet orifice of a first metallugical vessel (1) and a second metallurgical vessel (4), one end (5a) of the casting tube having a removable and substantially leaktight engagement about a casting nozzle (3) or about an adapter (18) forming an extension of a nozzle (19) of said first vessel (1) so as to restrict the flow of air between the casting tube and the nozzle or adpter, said casting tube being formed of material (7) comprising inorganic particles which are embedded in an organic binder, said inorganic particles being sinterable under the action of the heat of the liquid metal as it flows within said tube; the improvement comprising a ring (8, 9, 11, 12, 13, 14, 30) of refractory material on said tube end (5a) engaged on and surrounding the lateral surface of the casting nozzle (3) or adapter (18), the internal surface of the said ring being shaped as the lateral surface of said casting nozzle (3) or adapter (18) and having a substantially leaktight engagement with said lateral surface, the height of said ring being such that its bottom edge (8b) is located above the zone in which the liquid metal (15) which is poured into the tube would be liable to come into contact with the internal surface of said tube, and another refractory ring on the end of the tube which is opposite the first-mentioned ring.
Claim 2
Dependent Claim
243 words
In a combination comprising a heat-insulating casting tube (5) disposed between the outlet orifice of a first metallugical vessel (1) and a second metallurgical vessel (4), one end (5a) of the casting tube having a removable and substantially leaktight engagement about a casting nozzle (3) or about an adapter (18) forming an extension of a nozzle (19) of said first vessel (1) so as to restrict the flow of air between the casting tube and the nozzle or adpter, said casting tube being formed of material (7) comprising inorganic particles which are embedded in an organic binder, said inorganic particles being sinterable under the action of the heat of the liquid metal as it flows within said tube; the improvement comprising a ring (8, 9, 11, 12, 13, 14, 30) of refractory material on said tube end (5a) engaged on and surrounding the lateral surface of the casting nozzle (3) or adapter (18), the internal surface of the said ring being shaped as the lateral surface of said casting nozzle (3) or adapter (18) and having a substantially leaktight engagement with said lateral surface, the height of said ring being such that its bottom edge (8b) is located above the zone in which the liquid metal (15) which is poured into the tube would be liable to come into contact with the internal surface of said tube, and another refractory ring on the end of the tube which is opposite the first-mentioned ring.
Claim 3
Dependent Claim
47 words
A combination according to claim 1, wherein the height of the ring (8, 9, 11, 12, 13, 14) of refractory material is at least equal to the distance over which said end (5a) of the casting tubc (5) is intended to be engaged on said casting nozzle.
Claim 4
Dependent Claim
44 words
A combination tube according to claim 1, the tube being formed by molding, wherein the ring (8, 9, 11, 12, 13, 14) of refractory material is attached to the material of the wall (7) of the tube (5) during the molding of said wall.
Claim 5
Dependent Claim
50 words
A combination according to claim 1, wherein the wall thickness of the refractory ring (8, 9, 11) is substantially equal to the wall thickness of the wall (7), the internal and external surfaces of the ring being substantially coextensive with the internal and external surfaces of the tube wall (7).
Claim 6
Dependent Claim
29 words
A combination tube according to claim 4, wherein the contact surface between the refractory ring (9) and the tube wall (7) has at least one stepped annular recess (10).
Claim 7
Dependent Claim
42 words
A combination according to claim 1, wherein the thickness of the refractory ring (11) is smaller than the thickness of the tube wall (7), the internal surface (lla) of said ring being substantially coextensive with the internal surface (7a) of said tube.
Claim 8
Dependent Claim
25 words
A combination according to claim 1, wherein the internal diameter of the refractory ring (12, 13) is smaller than the internal diameter of said tube.
Claim 9
Dependent Claim
25 words
A combination according to claim 7, wherein the external surface (12a) of the ring (12) is coextensive with the internal surface (7a) of said tube.
Claim 10
Dependent Claim
42 words
A combination according to claim 7, wherein the external diameter of the refractory ring (13) is greater than the internal diameter of said tube and wherein said ring is partially sunk within an annular recess (13a) formed in the tube wall (7).
Claim 11
Dependent Claim
37 words
A combination tube according to claim 1, wherein the top portion of the internal surface of the refractory ring (14) is provided with an annular enlargement (14a) for receiving the free end of the casting nozzle (3).
Claim 12
Dependent Claim
27 words
A combination according to claim 1, wherein the thickness of the ring (16) is substantially equal to the thickness of the wall (7) of the tube (5).
Claim 13
Dependent Claim
61 words
A combination according to claim 1 and comprising a protective outer sheet-metal sleeve, wherein said sheet-metal sleeve is provided with an outwardly-projecting hollow annular bead (22) defining an empty annular space (23) between said sheet-metal sleeve and the internal tube wall (7), said space being intended to communicate with a pipe (25) connected to a source of non-oxidizing or inert gas.
Claim 14
Dependent Claim
19 words
A combination according to claim 12, wherein said hollow annular bead (22) is adjacent to the refractory ring (8).
Claim 15
Dependent Claim
93 words
A combination according to claim 12, wherein the outer sheet-metal sleeve (6) is provided at the top with a hollow annular bead constituted by a rolled-in edge (27) of the sheet-metal sleeve, said rolled-in edge being applied against the adjacent end of the tube wall (7) and intended to define within the interior of said rolled-in edge an annular duct which communicates with a pipe (28) for the admission of inert gas, said rolled-in edge (26) being provided with a series of openings (27) directed radially towards the axis of said casting tube.
Claim 16
Dependent Claim
11 words
A combination according to claim 1, wherein said tube is frusto-conical.
Claim 17
Dependent Claim
12 words
A combination according to claim 1, wherein said tube is entirely cylindrical.
Claim 18
Dependent Claim
20 words
A combination according to claim 16, wherein the ends of said tube are fitted with two identical rings (30, 31).
Claim 19
Dependent Claim
38 words
A combination according to claim 17, wherein one of the rings is of basic refractory inorganic material whilst the other ring is of acid refactory inorganic material, a refractory inorganic binding agent being incorporated in said inorganic material.
Claim 20
Dependent Claim
87 words
A combination according to claim 1, wherein an annular channel (41) is formed around the refractory ring (42), said channel being closed laterally by the outer sheet-metal jacket (43) of the casting tube (40), wherein an inert-gas feed-pipe (44) opens into said channel (41), and wherein ducts (47) formed at the interface (45) between the refractory ring (42) and the internal lining (46) of the casting tube (40) are adapted to communicate with the annular channel (41) and open into the interior of said casting tube (40).
Claim 21
Dependent Claim
63 words
A combination according to claim 1, wherein an annular channel (50) is formed between that end of the nozzle (48) on which the refactory ring (49) is engaged and said ring, said channel (50) being cut in the refractory material of said ring and adapted to communicate with an inert-gas feed-pipe (44) via a duct (51) which extends through the refractory ring (49).
Claim 22
Dependent Claim
77 words
A combination according to claim 1, wherein an annular channel (53) is formed above the refractory ring (54), said channel (53) being delimited on the one hand by the lateral surface of the nozzle (48) and on the other hand by a flange (43a) of the outer sheet-metal jacket (43) of the casting tube, and wherein the inert-gas feed-pipe (55) opens into said channel (53), the flange (43a) being covered by a seal (55) of ceramic fibers.
Claim 23
Dependent Claim
87 words
A combination according to claim 1, wherein an annular channel (50) is formed between that end of the nozzle (48) on which the refactory ring (49) is engaged and said ring, said channel (50) being cut in the refactory material of said ring and adapted to communicate with an inert-gas feed-pipe (44) via a duct (51) which extends through the refactory ring (49), a seal (52) of asbestos, glass, slag or ceramic fibers being interposed between the refractory ring (49) and the end of the nozzle (48).
References Cited (Backward Citations)
FR1493389A
Cited
FR1551363A
Cited
GB1215330A
Cited
FR2333599A1
Cited
US4202533A
Cited
US4290589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |