US4457690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse Burners
Assignee: Toshiba Corp
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Filing: 1982-12-20
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Granted: 1984-07-03
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Expires: 2002-12-20
Abstract
Abstract In a pulse burner of the type wherein an air-fuel mixture in a combustion chamber is explosively burnt by an ignition plug and resulting flame is detected by a flame detector to control the operation of the pulse burner, there is used a flame detector which detects electric current flowing in the flame instead of a thermostat secured to a side wall of the combustion chamber.
Inventors
- 👤 Toshihiko Saito
- 👤 Fusao Hirasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:31
CPC Classifications
F; F23; F23C; F23C15/00; F23M; F23M11/00; F23M11/04; F23M11/045
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A pulse burner comprising: a combustion cylinder provided with an ignition plug; a fuel inlet passage for supplying fuel into said combustion cylinder; an air inlet passage for supplying combustion air into said combustion cylinder; flapper valve means operated by pressure variations caused by an explosive combustion of an air-fuel mixture in said combustion cylinder and exhaust of combustion product therefrom, whereby the flapper valve means repeatedly opens and closes the fuel inlet passage and the air inlet passage; flame confining means disposed in said combustion cylinder to confine therein a portion of the combustion product; and a flame detector positioned in said flame confining means for detecting flame in accordance with electric current flowing through said flame.
Claim 2
Dependent Claim
118 words
A pulse burner comprising: a combustion cylinder provided with an ignition plug; a fuel inlet passage for supplying fuel into said combustion cylinder; an air inlet passage for supplying combustion air into said combustion cylinder; flapper valve means operated by pressure variations caused by an explosive combustion of an air-fuel mixture in said combustion cylinder and exhaust of combustion product therefrom, whereby the flapper valve means repeatedly opens and closes the fuel inlet passage and the air inlet passage; flame confining means disposed in said combustion cylinder to confine therein a portion of the combustion product; and a flame detector positioned in said flame confining means for detecting flame in accordance with electric current flowing through said flame.
Claim 3
Dependent Claim
38 words
The pulse detector as set forth in claim 1 wherein said combustion cylinder is divided into a combustion chamber and an air chamber by a partition wall provided with said air inlet passage and said fuel inlet passage.
Claim 4
Dependent Claim
49 words
The pulse burner as set forth in claim 1 wherein said flame confining means is disposed in said combustion chamber with its bottom spaced from said partition wall and said flapper valve is positioned in a space between the bottom of said flame confining means and said partition wall.
Claim 5
Dependent Claim
51 words
The pulse burner as set forth in claim 2 wherein said flame detector is secured to a center of said partition wall to extend along a central axis of said cup shaped flame confining means, and said ignition plug is located near the bottom of said cup shaped flame confining means.
Claim 6
Dependent Claim
41 words
The pulse burner as set forth in claim 1 which further comprises a controller supplied with an output signal of said flame detector to controll energization of said ignition plug, and supply of combustion air and fuel into said combustion chamber.
Claim 7
Dependent Claim
46 words
The pulse burner as set forth in claim 2 wherein said flame detector has an inverted L shaped configuration, one leg of said detector being secured to said combustion cylinder while the other leg extending along a central axis of said cup shaped flame confining 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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |