US3723049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonance control for a muffle burner
Assignee: Sulzer AG
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Filing: 1971-05-26
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Granted: 1973-03-27
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Expires: 1991-05-26
Abstract
Abstract Vanes are provided in the inlet to the outer annular combustion air supply duct which are adjustable to change the direction of air flow by a magnitude of up to 10 percent in the tangential velocity component at the outlet of the outer duct. This avoids humming or whistling. The vanes are controlled in unison from a control lever outside the distribution box.
Inventors
- 👤 E Juricek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:34
CPC Classifications
F; F23; F23C; F23C7/00; F23C7/002; F23C7/004; F23C7/008; F23D; F23D2210/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
In combination with a muffle burner having a central means for supplying fuel, means for supplying combustion air including at least two annular ducts surrounding said central means, means in each duct for imparting twist to the air flowing through each said duct to cause the air discharged from said ducts to have a tangential velocity component; direction changing means for adjustably changing the direction of the air flowing to at least one of said twist imparting, and damper means upstream of said direction changing means for controlling the flow of air to the duct associated with said direction changing means while not obstructing the flow of air to the other of said ducts means.
Claim 2
Dependent Claim
115 words
In combination with a muffle burner having a central means for supplying fuel, means for supplying combustion air including at least two annular ducts surrounding said central means, means in each duct for imparting twist to the air flowing through each said duct to cause the air discharged from said ducts to have a tangential velocity component; direction changing means for adjustably changing the direction of the air flowing to at least one of said twist imparting, and damper means upstream of said direction changing means for controlling the flow of air to the duct associated with said direction changing means while not obstructing the flow of air to the other of said ducts means.
Claim 3
Dependent Claim
46 words
The combination as set forth in claim 1 wherein said direction changing means is arranged to change the direction of air flowing to at least one of said twist imparting means relative to the direction of air flowing to the remainder of said twist imparting means.
Claim 4
Dependent Claim
41 words
The combination as set forth in claim 2 wherein said direction changing means includes a plurality of circumferentially distributed vanes adjacent an inlet of the outermost of said annular ducts and means for adjusting said vanes relative to said outermost duct.
Claim 5
Dependent Claim
78 words
The combination as set forth in claim 3 wherein said means for adjusting said vanes includes a spindle connected to each vane to pivot said respective vane in said inlet, a ring connected in common to each said spindle to rotate said spindles in unison and a control lever connected to one of said spindles at a position remote from said outermost duct to rotate said one spindle to adjust said vane thereon relative to said oUtermost duct.
Claim 6
Dependent Claim
43 words
The combination as set forth in claim 1 wherein said direction changing means is adjustably mounted to effect a maximum change in the magnitude of the tangential velocity component at an outlet of said one twist imparting means of less than 10 percent.
Claim 7
Dependent Claim
21 words
The combustion as set forth in claim 1 wherein said damper means is a sleeve axially displaceably mounted over said ducts.
References Cited (Backward Citations)
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |