US3998581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaseous fuel burners
Assignee: Hotwork International Ltd
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Filing: 1975-05-12
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Granted: 1976-12-21
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Expires: 1995-05-12
Abstract
Abstract A high velocity gaseous fuel burner has a casing with an inlet end into which air is blown to an outlet end in the form of a nozzle. Within the casing but circumferentially spaced therefrom is an elongated combustion tube into the rear end of which a main burner unit projects a fuel/air mixture. The outlet end of the tube reaches to or into the nozzle and the air blown through the casing passes over the combustion tube, some air passing into the tube through apertures in its wall. A boost burner unit may be mounted through the walls of the casing and tube to project a fuel/air mixture axially towards the casing nozzle to produce further combustion beyond the tube outlet. Valves are provided for controlling the flow of fuel and air to the two burner units jointly and/or separately.
Inventors
- 👤 Maurice Hemingway
- 👤 Trevor Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:30
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/28; F23R3/34; F23R3/346
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
In a gaseous high velocity burner of the type having a. an elongate combustion tube, b. a main burner unit at the inlet end of the combustion tube, c. means for supplying fuel and compressed air to the main burner unit, d. a casing surrounding and spaced from the combustion tube, the casing tapering towards a nozzle serving as the outlet for the high velocity burner, the combustion tube having its outler end projecting substantially to the entrance of the nozzle, e. and the combustion tube having multiplicity of apertures remote from its outlet end, the apertures providing communication between the interior of the combustion tube and the space between the combustion tube and the casing, the improvement comprising
Claim 2
Dependent Claim
119 words
In a gaseous high velocity burner of the type having a. an elongate combustion tube, b. a main burner unit at the inlet end of the combustion tube, c. means for supplying fuel and compressed air to the main burner unit, d. a casing surrounding and spaced from the combustion tube, the casing tapering towards a nozzle serving as the outlet for the high velocity burner, the combustion tube having its outler end projecting substantially to the entrance of the nozzle, e. and the combustion tube having multiplicity of apertures remote from its outlet end, the apertures providing communication between the interior of the combustion tube and the space between the combustion tube and the casing, the improvement comprising
Claim 3
Dependent Claim
63 words
a boost burner unit disposed in the combustion tube downstream of said apertures, the boost burner unit having its outlet centrally situated in the combustion tube, 2. and means for supplying fuel and compressed air to the boost burner unit whereby a fuel enriched output is emitted from the combustion tube that sustains further combustion beyond the outlet end of the combustion tube.
Claim 4
Dependent Claim
63 words
a boost burner unit disposed in the combustion tube downstream of said apertures, the boost burner unit having its outlet centrally situated in the combustion tube, 2. and means for supplying fuel and compressed air to the boost burner unit whereby a fuel enriched output is emitted from the combustion tube that sustains further combustion beyond the outlet end of the combustion tube.
Claim 5
Dependent Claim
75 words
The improvement according to claim 1, wherein the means for supplying fuel and compressed air to the boost burner unit are connected to the same fuel and air supply as the main burner unit and wherein the means for supplying fuel and compressed air to the boost burner unit include valve means for varying the mixture supplied to the boost burner unit independently of the fuel and air mixture supplied to the main burner unit.
Claim 6
Dependent Claim
38 words
The improvement according to claim 1, further including 3. mounting means supporting the boost burner unit whereby the boost burner unit can be withdrawn from the combustion tube when use of the boost burner unit is not required.
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) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |