US3614083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Outside change tuyere
Assignee: Union Carbide Corp
•
Filing: 1969-05-02
•
Granted: 1971-10-19
•
Expires: 1989-05-02
Abstract
Abstract Blowpipe assembly for introducing gas below the surface of a molten metal bath which is capable of rapid removal and installation in an opening in the wall of a refractory lined processing vessel. The assembly consists of a metal blowpipe having a nozzle capable of discharging a sonic velocity gas stream, and refractory protection substantially surrounding and secured to the blowpipe so that the blowpipe and refractory constitute an integral assembly. The vessel opening is provided with wear and erosion resistant refractory lining forming a socket for the blowpipe assembly. The assembly can be inserted into, removably secured to, and removed from the vessel from the outside.
Inventors
- 👤 Ronald L W Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:35
CPC Classifications
B; B22; B22D; B22D1/00; B22D1/002; B22D1/005; C; C21; C21C; C21C7/00; C21C7/0037
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
A tuyere suitable for introducing gas beneath the surface of molten metal comprising a metal blowpipe provided with: (a) refractory protection means which substantially surround said blowpipe, (b) a nozzle portion at the discharge end of said blowpipe capable of discharging gas at at least sonic velocity, (c) means to prevent steel runback into the gas passages of said blowpipe when the flow of gas is reduced or stopped, and (d) means for securing said refractory protection means to said blowpipe such that the metal blowpipe and said refractory means constitute an integral blowpipe assembly, whereby said assembly is adapted to be inserted into and removably secured to said vessel from the outside; and wherein the refractory protection means which surround the nozzle portion of the metal blowpipe contains a central cavity around the discharge end thereof filled with refractory material which is resistant to molten metal.
Claim 2
Dependent Claim
147 words
A tuyere suitable for introducing gas beneath the surface of molten metal comprising a metal blowpipe provided with: (a) refractory protection means which substantially surround said blowpipe, (b) a nozzle portion at the discharge end of said blowpipe capable of discharging gas at at least sonic velocity, (c) means to prevent steel runback into the gas passages of said blowpipe when the flow of gas is reduced or stopped, and (d) means for securing said refractory protection means to said blowpipe such that the metal blowpipe and said refractory means constitute an integral blowpipe assembly, whereby said assembly is adapted to be inserted into and removably secured to said vessel from the outside; and wherein the refractory protection means which surround the nozzle portion of the metal blowpipe contains a central cavity around the discharge end thereof filled with refractory material which is resistant to molten metal.
Claim 3
Dependent Claim
37 words
The tuyere of claim 1 wherein the inner portion of said cavity is filled with highly insulating refractory material and at the outer exposed portion is filled with refractory which is resistant to erosion from molten metal.
Claim 4
Dependent Claim
30 words
The tuyere of claim 1 wherein the means to prevent steel runback into the gas passages of said blowpipe comprises screen means located in the nozzle portion of said blowpipe.
Claim 5
Dependent Claim
19 words
The tuyere of claim 1 wherein said metal blowpipe is comprised of a nozzle connected to a tuyere tube.
Claim 6
Dependent Claim
21 words
The tuyere of claim 4 wherein said nozzle is threadably connected to said tuyere tube by means of a pipe coupling.
Claim 7
Dependent Claim
21 words
The tuyere of claim 1 wherein the refractory protection means which substantially surround said blowpipe have an inwardly tapering frustoconical shape.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |