Patent US3980422A successfully refreshed from Google Patents.
US3980422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil injection means for liquid fuel burner
Assignee: HED IND Inc
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Filing: 1975-08-11
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Granted: 1976-09-14
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Expires: 1995-08-11
Abstract
Abstract A burner for burning gasified liquid fuel such as oil, in which the fuel is gasified by being mixed with hot burned gases drawn from the combustion chamber, is provided in which the normal thermal stresses found in such burners due to the return of the hot burned gases for gasifying are substantially reduced and, at the same time, start-up time is reduced. Minimization of the thermal stresses is accomplished by utilizing the heat of vaporization of the oil or other fuel to cool the hot returning gases, and so limit thermal expansion, by having the gasification of the fuel commence at a pre-selected adjusted distance from the hot gas outlet of the burner, according to the particular application and ambient conditions in which the burner is installed. This permits elimination of a gasification chamber, which in some cases has been required to provide a preheating area for the oil, and so further reduces stresses. With such elimination, rapid start-up is provided by preliminarily burning ungasified fuel introduced by the air and fuel system of the principal unit. At the same time, maximum combustion efficiency is achieved through the capability of adjustable positioning of the point of injection of the fuel into the recycled hot burned gases.
Inventors
- 👤 John S. Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:56
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/005; F16; F16H; F16H37/00; F23C; F23C9/00; F16H2700/00; F16H2700/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
224 words
In a liquid fuel burner for burning a gasifiable liquid fuel such as oil and having reduced thermal stresses, said burner being of the type including a burner made of refractory material and having a fire chamber, said chamber having a fuel mixture inlet port, a burned gas removal port, and a hot burned gas feedback port, a mixing chamber for mixing said fuel and air, said mixing chamber being connected to said inlet port, a burned gas and fuel inlet to said mixing chamber, means directly interconnecting said burned gas removal port to said burned gas and fuel inlet, an air inlet to said mixing chamber for directing air under pressure into said mixing chamber, said air inlet including a Venturi for drawing burned gas and fuel into said chamber through said interconnecting means and said burned gas and fuel inlet, and a gasifiable liquid fuel inlet connected to said interconnecting means proximate to said refractory material, whereby said fuel will be gasified by hot burned gas as it passes through said interconnecting means and the heat of vaporization of said fuel will cool said hot burned gases, thereby reducing the temperatures thereof and reducing thermal stresses therein, the improvement comprising means for adjusting the position of said liquid fuel inlet longitudinally of the interconnecting means, toward and away from said refractory material.
Claim 2
Dependent Claim
224 words
In a liquid fuel burner for burning a gasifiable liquid fuel such as oil and having reduced thermal stresses, said burner being of the type including a burner made of refractory material and having a fire chamber, said chamber having a fuel mixture inlet port, a burned gas removal port, and a hot burned gas feedback port, a mixing chamber for mixing said fuel and air, said mixing chamber being connected to said inlet port, a burned gas and fuel inlet to said mixing chamber, means directly interconnecting said burned gas removal port to said burned gas and fuel inlet, an air inlet to said mixing chamber for directing air under pressure into said mixing chamber, said air inlet including a Venturi for drawing burned gas and fuel into said chamber through said interconnecting means and said burned gas and fuel inlet, and a gasifiable liquid fuel inlet connected to said interconnecting means proximate to said refractory material, whereby said fuel will be gasified by hot burned gas as it passes through said interconnecting means and the heat of vaporization of said fuel will cool said hot burned gases, thereby reducing the temperatures thereof and reducing thermal stresses therein, the improvement comprising means for adjusting the position of said liquid fuel inlet longitudinally of the interconnecting means, toward and away from said refractory material.
Claim 3
Dependent Claim
39 words
An improvement in liquid fuel burners as in claim 1, wherein said liquid fuel inlet into the interconnecting means is at the discharge end of a tubular liquid fuel supply member adjustable axially of and within the interconnecting means.
Claim 4
Dependent Claim
44 words
An improvement in liquid fuel burners as in claim 1, wherein the liquid fuel inlet into the interconnecting means is in the form of a nozzle provided at the discharge end of a tubular member mounted within the interconnecting means for adjustment axially thereof.
Claim 5
Dependent Claim
45 words
An improvement in liquid fuel burners as in claim 3 wherein said nozzle is of the sparging type and discharges the liquid fuel in a direction radially outwardly from the axis of the interconnecting means into the path of the hot burned gases passing therethrough.
Claim 6
Dependent Claim
127 words
An improvement in liquid fuel burners as in claim 1 wherein said means for adjusting the position of the liquid fuel inlet includes an elongated tubular member having a discharge nozzle at one end defining said inlet of the liquid fuel into the interconnecting means, said tubular member extending coaxially of and within the interconnecting means and terminating at its discharge end in close proximity to the refractory material, a fitting mounted within the interconnecting means in which the tubular member is slidable axially of the interconnecting means for adjustable positioning of said liquid fuel inlet in respect to the burned gas removal port and the burned gas and fuel inlet, and means for retaining the tubular member in selected positions to which it is axially adjusted.
Claim 7
Dependent Claim
113 words
An improvement in liquid fuel burners as in claim 1, wherein the means for adjusting the position of the liquid fuel inlet comprises an elongated tubular member having a discharge nozzle at one end disposed within the interconnecting means and defining the liquid fuel inlet into the interconnecting means, said elongated tubular member projecting at its other end out of the interconnecting means, the tubular member being mounted in the interconnecting means for slidable and rotatable adjustment in a direction axially of the interconnecting means and tubular member, and support means for the second named end of the tubular member, providing a connection of said tubular member to a source of liquid fuel.
Claim 8
Dependent Claim
77 words
An improvement in liquid fuel burners as in claim 6, wherein said support means for the tubular member comprises a sleeve-like fitting having an axial, threaded bore, said other end of the tubular member being threadably engageable in said bore, said fitting being stationarily mounted exteriorly of the interconnecting means, whereby upon rotation of the tubular member within said bore of the support fitting said tubular member will be adjusted axially of and within the interconnecting means.
Claim 9
Dependent Claim
86 words
An improvement in liquid fuel burners as in claim 7, wherein said support fitting includes sealing means extending about the tubular member, said sealing means being adapted for relieving sealing pressure against the tubular member to permit rotatable adjustment of said tubular member, the sealing means being adapted to be tightened upon adjustment of the tubular member to a selected extent, to prevent leakage of liquid fuel and to retain the tubular member in selected positions to which it is adjusted longitudinally of the interconnecting means.
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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |