US3663153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion device for gaseous fuel
Assignee: Shell USA Inc
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Filing: 1970-09-08
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Granted: 1972-05-16
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Expires: 1990-09-08
Abstract
Abstract A combustion device for gaseous fuel, such as LPG, of the type having a coaxial burner opening into combustion chamber having an open downstream end. An annular supply for primary air and fuel issues into the bottom of flame chamber which is surrounded by an annular supply for secondary air. Means, such as a baffle are provided for subdividing the combustion air from a single source into determined proportions of primary and secondary air and means are providing for decreasing the velocity of the secondary air stream with respect to the velocity of the primary air stream.
Inventors
- 👤 Leonard P Bagge
- 👤 Robert W Kear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:15
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/20; F23D14/22; F23C; F23C3/00; F23C7/00; F23C7/008
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
145 words
In a combustion device for operation with a gaseous fuel of the type having a combustion chamber and an associated coaxial burner opening into the combustion chamber, the improvement comprising: a flame chamber having walls and a bottom positioned in the burner and in communication with the combustion chamber, annular primary air supply means opening into the bottom of the flame chamber, annular fuel supply means opening into the bottom of the flame chamber, annular secondary air supply means surrounding the flame chamber, an air supply inlet in communication with the primary air supply means and the secondary air supply means, means operatively associated with the air supply inlet for subdividing air into selected proportions of primary and secondary air, and means within the secondary air supply means for decreasing the velocity of the secondary air with respect to the velocity of the primary air.
Claim 2
Dependent Claim
145 words
In a combustion device for operation with a gaseous fuel of the type having a combustion chamber and an associated coaxial burner opening into the combustion chamber, the improvement comprising: a flame chamber having walls and a bottom positioned in the burner and in communication with the combustion chamber, annular primary air supply means opening into the bottom of the flame chamber, annular fuel supply means opening into the bottom of the flame chamber, annular secondary air supply means surrounding the flame chamber, an air supply inlet in communication with the primary air supply means and the secondary air supply means, means operatively associated with the air supply inlet for subdividing air into selected proportions of primary and secondary air, and means within the secondary air supply means for decreasing the velocity of the secondary air with respect to the velocity of the primary air.
Claim 3
Dependent Claim
47 words
A combustion device according to claim 1, wherein the primary air supply means comprises a first annular cone-shaped channel opening into the flame chamber and wherein the fuel supply means comprises a second annular cone-shaped channel surrounding the first cone-shaped channel and opening into the flame chamber.
Claim 4
Dependent Claim
71 words
A combustion device according to claim 2 wherein the primary air supply means comprises a central barrel slidably mounted in the burner, the barrel forming the inner lateral wall of the air supply means and the end of the barrel adjacent the flame chamber being cone-shaped, whereby the width of the opening of the primary air supply means into the flame chamber may be adjusted by axially sliding the central barrel.
Claim 5
Dependent Claim
57 words
A combustion device according to claim 1 including support means for supporting the walls of the flame chamber, the support means being affixed to the walls of the flame chamber and slidably mounted on the burner whereby the support means may be adjusted to regulate the distance the walls extend above the bottom of the flame chamber.
Claim 6
Dependent Claim
23 words
A combustion device according to claim 1, wherein the means for subdividing air comprises a baffle plate positioned in the secondary air channel.
Claim 7
Dependent Claim
34 words
A combustion device according to claim 5, wherein the means for decreasing the velocity of the secondary air comprises an annular expansion chamber in the secondary air supply means downstream of the baffle plate.
Claim 8
Dependent Claim
33 words
A combustion device according to claim 1, wherein a perforate air distribution plate is mounted in the secondary air supply means for promoting uniform distrIbution of air in the secondary air supply means.
Claim 9
Dependent Claim
47 words
A combustion device according to claim 1, wherein the combustion chamber is provided with a mixing throat comprising a local restriction of the diameter of the combustion chamber downstream with regard to the flame chamber but at some distance from the downstream end of the combustion chamber.
Claim 10
Dependent Claim
29 words
A combustion device according to claim 8, wherein the combustion chamber comprises a metal casing which is refractory-lined, a fiber insulation being provided between the lining and the casing.
References Cited (Backward Citations)
US1172755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |