US3695820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas burners
Assignee: Individual
•
Filing: 1970-04-20
•
Granted: 1972-10-03
•
Expires: 1990-04-20
Abstract
Abstract A gas burner comprises an annular chamber surrounding the fuel and air inlet end of a throated nozzle, with a circular slit orifice opening from the chamber into the nozzle upstream of the throat, and a flame stabilizer at one end of the nozzle, fuel gas passing through the slit expanding to form a Coanda wall jet around the inlet peripheral converging wall of the nozzle and inducing a flow of air down the center of the nozzle, the radial pressure gradient created by the jet sheet following the converging wall of the nozzle to its throat bringing about a high degree of air entrainment, whereby stable combustion results, at a point determined by the flame stabilizer.
Inventors
- 👤 Ivor Hawkes
- 👤 Joshua Swithenbank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:25
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/46; F23D14/72; F23D14/74; F23D14/62; F23D14/64
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
A gas burner comprising: a source of fuel gas, an annular chamber for receiving a supply of fuel gas under pressure from said source, a convergent-divergent throated nozzle surrounded near its inlet end by said annular chamber, said burner including a circular slit orifice opening from the chamber into the nozzle upstream of the throat, said nozzle and said slit being arranged to produce a Coanda effect entraining air as an oxidizer as a result of fuel gas under pressure issuing from said slit, a flame stabilizer mounted at one end of the nozzle, said flame stabilizer being mounted at the inlet end of the nozzle and is in the form of a vortex chamber with non-radial air inlet slots, whereby expansion of gas through the slit forms a Coanda wall jet around the inner peripheral converging wall of the nozzle for the induction of air down the center of the nozzle.
Claim 2
Dependent Claim
152 words
A gas burner comprising: a source of fuel gas, an annular chamber for receiving a supply of fuel gas under pressure from said source, a convergent-divergent throated nozzle surrounded near its inlet end by said annular chamber, said burner including a circular slit orifice opening from the chamber into the nozzle upstream of the throat, said nozzle and said slit being arranged to produce a Coanda effect entraining air as an oxidizer as a result of fuel gas under pressure issuing from said slit, a flame stabilizer mounted at one end of the nozzle, said flame stabilizer being mounted at the inlet end of the nozzle and is in the form of a vortex chamber with non-radial air inlet slots, whereby expansion of gas through the slit forms a Coanda wall jet around the inner peripheral converging wall of the nozzle for the induction of air down the center of the nozzle.
Claim 3
Dependent Claim
138 words
A gas burner comprising: a source of fuel gas, an annular chamber for receiving a supply of fuel gas under pressure from said source, a convergent-divergent throated nozzle surrounded near its inlet end by said annular chamber, said burner including a circular slit orifice opening from the chamber into the nozzle upstream of the throat, said nozzle and said slit being arranged to produce a Coanda effect entraining air as an oxidizer as a result of fuel gas under pressure issuing from said slit, means for adjusting the gap where the slit opens into the nozzle, a flame stabilizer mounted at one end of the nozzle, whereby expansion of gas through the slit forms a Coanda wall jet around the inner peripheral converging wall of the nozzle for the induction of air down the center of the nozzle.
Claim 4
Dependent Claim
138 words
A gas burner comprising: a source of fuel gas, an annular chamber for receiving a supply of fuel gas under pressure from said source, a convergent-divergent throated nozzle surrounded near its inlet end by said annular chamber, said burner including a circular slit orifice opening from the chamber into the nozzle upstream of the throat, said nozzle and said slit being arranged to produce a Coanda effect entraining air as an oxidizer as a result of fuel gas under pressure issuing from said slit, means for adjusting the gap where the slit opens into the nozzle, a flame stabilizer mounted at one end of the nozzle, whereby expansion of gas through the slit forms a Coanda wall jet around the inner peripheral converging wall of the nozzle for the induction of air down the center of the nozzle.
Claim 5
Dependent Claim
20 words
A gas burner as in claim 2, wherein the flame stabilizer is mounted at the exit end of the nozzle.
Claim 6
Dependent Claim
42 words
A gas burner as in claim 3, wherein the end stabilizer is a tunnel stabilizer of larger diameter than the exit end, to provide return eddy currents by the helical vortex created by the gas and air immediately on leaving the exit.
Claim 7
Dependent Claim
96 words
A gas burner comprising: an annular chamber, a throated nozzle surrounded near its inlet end by the chamber, a circular slit orifice opening from the chamber into the nozzle upstream of the throat, a flexible annular diaphragm forming one wall of the annular orifice, a flame stabilizer mounted at one end of the nozzle, and a fuel gas inlet to the annular chamber, whereby expansion of gas through the slit will form a Coanda wall jet around the inner peripheral converging wall of the nozzle, for the induction of air down the center of the nozzle.
Claim 8
Dependent Claim
96 words
A gas burner comprising: an annular chamber, a throated nozzle surrounded near its inlet end by the chamber, a circular slit orifice opening from the chamber into the nozzle upstream of the throat, a flexible annular diaphragm forming one wall of the annular orifice, a flame stabilizer mounted at one end of the nozzle, and a fuel gas inlet to the annular chamber, whereby expansion of gas through the slit will form a Coanda wall jet around the inner peripheral converging wall of the nozzle, for the induction of air down the center of the nozzle.
Claim 9
Dependent Claim
31 words
A gas burner as in claim 5, wherein the inlet end of the nozzle is axially adjustable with respect to an outer sleeve that forms one wall of the annular orifice.
Claim 10
Dependent Claim
23 words
A gas burner as in claim 6, wherein the adjustment is manual, as by a screwthreaded connection between the nozzle and the sleeve.
Claim 11
Dependent Claim
42 words
A gas burner as in claim 6, wherein said nozzle and said chamber are movable axially thereof and include piston means for displacing said chamber selectively relative to said nozzle, whereby the adjustment of the gap is made by said piston means.
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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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |