US3748087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burner apparatus and method for flame propagation control
Assignee: Pyronics Inc
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Filing: 1971-10-14
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Granted: 1973-07-24
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Expires: 1991-10-14
Abstract
Abstract A burner apparatus comprises a fuel burner and flame tunnel in combination. The tunnel is of a suitable refractory material and is substantially goblet-shaped in cross section, comprising a first substantially cylindrical section and a second cup-shaped section, both sections being disposed along a common, longitudinal axis. The first, substantially cylindrical section diverges in the direction of fuel and air flow at an angle of not more than about 3* and preferably about 1 1/2 * from a theoretical cylindrical surface. The second, cup-shaped section faces the furnace side of the tunnel and diverges from its longitudinal axis in a convexo-curved section, then a concavocurved section and then terminates in a substantially cylindrical section at its outlet end. The outlet diameter is at least as great as the distance along the longitudinal axis of the curved segments of the second, cup-shaped section, and is at least two and one-half times and preferably four times as great as the inlet diameter of the first, substantially cylindrical section. Fuel and a first portion of combustion air are introduced with a rotational motion into the first section of the flame tunnel. A second portion of combustion air is injected at high velocity into the fuel/air admixture in a direction substantially transverse to the direction of flow through the flame tunnel. Combustion takes place in the flame tunnel, and a high kinetic energy is imposed upon the burning gas and air mixture within the confines of the first substantially cylindrical section. The injected, high velocity second portion of combustion air and the expanded, cup-shaped flame tunnel provide a full cross section highly radiating flame within the flame tunnel.
Inventors
- 👤 H Shular
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:36
CPC Classifications
F; F23; F23D; F23D17/00; F23D17/002; F23D11/00; F23D11/10; F23D11/101; F23D14/00; F23D14/20; F23D14/22; F23D14/24; F23M; F23M5/00; F23M5/02; F23M5/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
241 words
A burner apparatus comprising a fuel burner and a flame tunnel in combination, said fuel burner comprising a conduit for fuel, and a combustion air conduit, said conduits being structurally associated one with the other to pass admixed fuel and air into said flame tunnel, the improvement comprising, said flame tunnel has first and second sections arranged along a common longitudinAl axis, said first section is substantially cylindrical in shape, and has its inlet adjacent said burner and its outlet adjacent said second section, said second section includes a transition surface which increases in diameter from the inlet towards the outlet end thereof, and defines a transition length along said longitudinal axis, the outlet diameter of said second section is at least as great as the transition length, a combustion air deflection means is structurally associated with said combustion air conduit to impart rotational velocity about said longitudinal axis to combustion air entering said flame tunnel, said combustion air deflection means comprises a seal plate with an aperture therein, said seal plate being positioned substantially transversely to the flow of combustion air through said combustion air conduit, so that substantially the entirety of said flow passes through said aperture, a baffle plate positioned adjacent to said aperture and positioned with respect to said combustion air inlet so that substantially the entire flow of said combustion air is directed through said combustion air conduit in rotational motion about said conduit for fuel.
Claim 2
Dependent Claim
241 words
A burner apparatus comprising a fuel burner and a flame tunnel in combination, said fuel burner comprising a conduit for fuel, and a combustion air conduit, said conduits being structurally associated one with the other to pass admixed fuel and air into said flame tunnel, the improvement comprising, said flame tunnel has first and second sections arranged along a common longitudinAl axis, said first section is substantially cylindrical in shape, and has its inlet adjacent said burner and its outlet adjacent said second section, said second section includes a transition surface which increases in diameter from the inlet towards the outlet end thereof, and defines a transition length along said longitudinal axis, the outlet diameter of said second section is at least as great as the transition length, a combustion air deflection means is structurally associated with said combustion air conduit to impart rotational velocity about said longitudinal axis to combustion air entering said flame tunnel, said combustion air deflection means comprises a seal plate with an aperture therein, said seal plate being positioned substantially transversely to the flow of combustion air through said combustion air conduit, so that substantially the entirety of said flow passes through said aperture, a baffle plate positioned adjacent to said aperture and positioned with respect to said combustion air inlet so that substantially the entire flow of said combustion air is directed through said combustion air conduit in rotational motion about said conduit for fuel.
Claim 3
Dependent Claim
35 words
The burner apparatus of claim 1 wherein said fuel conduit is disposed within and substantially concentrically to said secondary conduit, and said secondary conduit is positioned within and substantially concentrically to said combustion air conduit.
Claim 4
Dependent Claim
196 words
A burner apparatus comprising a fuel burner and a flame tunnel in combination, said fuel burner comprising a fuel conduit for the passage of air therethrough, a secondary conduit for the passage of atomizing air or gas therethrough, and a combustion air conduit, said conduits being structurally associated one with the other to pass admixed fuel and air into said flame tunnel, said flame tunnel comprising first and second sections arranged along a common longitudinal axis, said first section being substantially cylindrical in shape, and having its inlet adjacent said burner and its outlet adjacent said second section, said second section including a transition surface which increases in diameter from the inlet towards the outlet end thereof, and defines a transition length along said longitudinal axis, the outlet diameter of said second section being at least as great as the transition length, nozzle means being attached to the outlet of said fuel conduit, said nozzle means restricting the size of the outlet from said secondary conduit, and said fuel conduit being adjustable along its longitudinal axis in relation to said secondary conduit, so that such adjustment varies the size of the outlet from said secondary conduit.
Claim 5
Dependent Claim
196 words
A burner apparatus comprising a fuel burner and a flame tunnel in combination, said fuel burner comprising a fuel conduit for the passage of air therethrough, a secondary conduit for the passage of atomizing air or gas therethrough, and a combustion air conduit, said conduits being structurally associated one with the other to pass admixed fuel and air into said flame tunnel, said flame tunnel comprising first and second sections arranged along a common longitudinal axis, said first section being substantially cylindrical in shape, and having its inlet adjacent said burner and its outlet adjacent said second section, said second section including a transition surface which increases in diameter from the inlet towards the outlet end thereof, and defines a transition length along said longitudinal axis, the outlet diameter of said second section being at least as great as the transition length, nozzle means being attached to the outlet of said fuel conduit, said nozzle means restricting the size of the outlet from said secondary conduit, and said fuel conduit being adjustable along its longitudinal axis in relation to said secondary conduit, so that such adjustment varies the size of the outlet from said secondary conduit.
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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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |