Patent US3825397A successfully refreshed from Google Patents.
US3825397A
Expired / Lapsed
US
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Control and security device for burners
Assignee: Monark Crescent AB
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Filing: 1973-05-21
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Granted: 1974-07-23
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Expires: 1993-05-21
Abstract
Abstract A burner for a car heater comprises an impeller for the supply of combustion air, and further, measuring means for controlling the supply of fuel. The impeller is inserted between the flame developed in said burner and a signal detector. This detector receives light pulses of different frequencies from the flame through the rotating impeller different with the frequency depending upon the different rotational speeds of the impeller. These frequencies are transformed into signals, which are supplied to the measuring means for controlling the fuel supply to the burner in relation to the quantity of combustion air supplied. This means also that the supply of fuel is shut off if the rotation of the impeller stops or if the flame goes out.
Inventors
- 👤 S Johansson
- 👤 H Carlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:35
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/08; F23N5/085; F23N1/00; F23N1/02; F23N1/025; F23N2229/00; F23N2229/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A control and security device for burners, especially such used in heaters, said device comprising an impeller means for supplying combustion supporting air to said burner, and measuring means for supplying an amount of fuel to said burner, light signal detector means, said impeller means being inserted between the flame developed in said burner and said signal detector, whereby the impeller chops the light of the flame falling on said signal detector means, said light detector being capable of receiving from said flame through said impeller light pulses at a frequency set by the rotational speed of said impeller, and means for transforming these frequencies into signals supplied to the measuring means to control the supply of fuel to said burner in relation to the combustion air supplied.
Claim 2
Dependent Claim
128 words
A control and security device for burners, especially such used in heaters, said device comprising an impeller means for supplying combustion supporting air to said burner, and measuring means for supplying an amount of fuel to said burner, light signal detector means, said impeller means being inserted between the flame developed in said burner and said signal detector, whereby the impeller chops the light of the flame falling on said signal detector means, said light detector being capable of receiving from said flame through said impeller light pulses at a frequency set by the rotational speed of said impeller, and means for transforming these frequencies into signals supplied to the measuring means to control the supply of fuel to said burner in relation to the combustion air supplied.
Claim 3
Dependent Claim
24 words
The device of claim 1 and light transmitting optical fiber means extending from the vicinity of the flame to one side of the impeller.
Claim 4
Dependent Claim
31 words
The device of claim 2 and said detector means comprising a photocell positioned on the opposite side of said impeller to receive light transmitted from said flame through said optical fiber.
Claim 5
Dependent Claim
13 words
The device of claim 1 wherein said impeller is a squirrel cage blower.
References Cited (Backward Citations)
US2870778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |