Patent US4525138A successfully refreshed from Google Patents.
US4525138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame signal enhancer for post-mixed burner
Assignee: Praxair Technology Inc
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Filing: 1983-10-28
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Granted: 1985-06-25
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Expires: 2003-10-28
Abstract
Abstract An apparatus for reliably monitoring a flame of a post-mixed burner without significantly altering the flame characteristics by forming a small but intense signal within the burner which is unaffected by furnace conditions and which corresponds to the actual flame.
Inventors
- 👤 William J. Snyder
- 👤 Raymond H. Miller
- 👤 Hisashi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:58
CPC Classifications
F; F23; F23M; F23M11/00; F23M11/04; F23M11/045
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
An apparatus for enhancing the flame signal of a post-mixed burner without significantly altering the flame characteristics comprising: (a) a passageway formed by a substantially cylindrical tube wall comprised of oxidation resistant material, said passageway having a discharge end; (b) a tube circumferentially around and axially along the substantially cylindrical tube wall defining an annular flow area between the tube and substantially cylindrical tube wall; (c) a flame detector which sights down through the passageway; (d) at least one connecting channel through the substantially cylindrical tube wall proximate the discharge end, communicating between the annular flow area and the passageway; and (e) a restriction in said annular flow area between the connecting channel and the discharge end such that the pressure of fluid in the annular flow area exceeds the pressure of fluid in the passageway.
Claim 2
Independent Claim
136 words
An apparatus for enhancing the flame signal of a post-mixed burner without significantly altering the flame characteristics comprising: (a) a passageway formed by a substantially cylindrical tube wall comprised of oxidation resistant material, said passageway having a discharge end; (b) a tube circumferentially around and axially along the substantially cylindrical tube wall defining an annular flow area between the tube and substantially cylindrical tube wall; (c) a flame detector which sights down through the passageway; (d) at least one connecting channel through the substantially cylindrical tube wall proximate the discharge end, communicating between the annular flow area and the passageway; and (e) a restriction in said annular flow area between the connecting channel and the discharge end such that the pressure of fluid in the annular flow area exceeds the pressure of fluid in the passageway.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 wherein said oxidation resistant material is an alloy of nickel, chromium and iron.
Claim 4
Dependent Claim
16 words
The apparatus of claim 1 wherein the tube extends to the discharge end of the passageway.
Claim 5
Dependent Claim
14 words
The apparatus of claim 1 wherein the flame detector is an ultraviolet light detector.
Claim 6
Dependent Claim
19 words
The apparatus of claim 1 having a plurality of channels communicating between the annular flow area and the passageway.
Claim 7
Dependent Claim
16 words
The apparatus of claim 5 wherein said plurality of channels are equispaced around said tube wall.
Claim 8
Dependent Claim
17 words
The apparatus of claim 5 having four channels communicating between the annular flow area and the passageway.
Claim 9
Dependent Claim
28 words
The apparatus of claim 1 wherein the channel is oriented at an angle in the range of from 15 to 75 degrees with respect to the tube wall.
Claim 10
Dependent Claim
21 words
The apparatus of claim 1 wherein said restriction is formed by an outward flare on the end of the tube wall.
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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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |