US3852729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame failure controls
Assignee: Fireye Inc
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Filing: 1973-03-06
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Granted: 1974-12-03
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Expires: 1993-03-06
Abstract
Abstract The invention has particular utility in connection with combustion control systems that employ lead sulfide (infrared sensitive) photoconductors in conjunction with band pass amplifiers. Flame relays in such systems would occasionally hold in after flame failure due to continued generation by the photoconductor of fluctuating signals. A flame failure transition responsive circuit is connected in series between the photoconductor and the flame relay and responds to an abrupt decrease in the flame signal to insure dropout of the flame relay.
Inventors
- 👤 P Cade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:54
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/24; F23N5/242; F23N5/02; F23N5/08; F23N5/082; Y; Y10; Y10T; Y10T137/00; Y10T137/1407
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
134 words
A condition responsive system comprising a radiation sensitive condition sensor for producing an output signal in response to the sensing of a condition to be detected, an output device arranged to assume a first state indicative of the condition being sensed when said sensor senses said condition and a second state indicative of the absence of said condition to be sensed when said sensor does not sense said condition, discriminator circuitry connecting said sensor and said output device for placing said output device in said first state in response to the production of a fluctuating output signal by said condition sensor, and circuitry responsive to an abrupt decrease in the condition sensed by said sensor for placing said output device in said second state independent of fluctuations of the signal produced by said sensor.
Claim 2
Dependent Claim
134 words
A condition responsive system comprising a radiation sensitive condition sensor for producing an output signal in response to the sensing of a condition to be detected, an output device arranged to assume a first state indicative of the condition being sensed when said sensor senses said condition and a second state indicative of the absence of said condition to be sensed when said sensor does not sense said condition, discriminator circuitry connecting said sensor and said output device for placing said output device in said first state in response to the production of a fluctuating output signal by said condition sensor, and circuitry responsive to an abrupt decrease in the condition sensed by said sensor for placing said output device in said second state independent of fluctuations of the signal produced by said sensor.
Claim 3
Dependent Claim
17 words
The system as claimed in claim 1 wherein said abrupt decrease responsive circuitry includes time delay circuitry.
Claim 4
Dependent Claim
22 words
The system as claimed in claim 1 wherein said abrupt decrease responsive circuitry is connected between said sensor and said discriminator circuitry.
Claim 5
Dependent Claim
28 words
The system as claimed in claim 1 wherein said abrupt decrease responsive circuitry is connected between said sensor and said output device in shunt with said discriminator circuitry.
Claim 6
Dependent Claim
13 words
The system as claimed in claim 1 wherein said sensor is a photoconductor.
Claim 7
Dependent Claim
30 words
The system as claimed in claim 1 wherein said condition to be detected is flame in a combustion chamber and said output device is the coil of a flame relay.
Claim 8
Dependent Claim
45 words
The system as claimed in claim 1 wherein said discriminator circuitry includes a band pass amplifier tuned to pass signals in the audio and subaudio range, and further including coupling means for applying output signals produced by said condition sensor to said band pass amplifier.
Claim 9
Dependent Claim
131 words
A combustion supervision system comprising a flame sensor for producing an output signal in response to the sensing of flame in a supervised combustion chamber, an output device arranged to assume a first state indicative of flame when said sensor senses flame and a second state indicative of the absence of flame when said sensor does not sense flame, discriminator circuitry connecting said sensor and said output device for placing said output device in said first state in response to the production of a fluctuating output signal by said flame sensor, and flame failure transition responsive circuitry connected to said flame sensor for placing said output device in said second state in response to an abrupt decrease in flame and independently of fluctuations of the signal produced by said flame sensor.
Claim 10
Dependent Claim
131 words
A combustion supervision system comprising a flame sensor for producing an output signal in response to the sensing of flame in a supervised combustion chamber, an output device arranged to assume a first state indicative of flame when said sensor senses flame and a second state indicative of the absence of flame when said sensor does not sense flame, discriminator circuitry connecting said sensor and said output device for placing said output device in said first state in response to the production of a fluctuating output signal by said flame sensor, and flame failure transition responsive circuitry connected to said flame sensor for placing said output device in said second state in response to an abrupt decrease in flame and independently of fluctuations of the signal produced by said flame sensor.
Claim 11
Dependent Claim
170 words
A combustion supervision system comprising a flame sensor for producing an output signal in response to the sensing of flame in a supervised combustion chamber, an output device arranged to assume a first state indicative of flame when said sensor senses flame and a second state indicative of the absence of flame when said sensor does not sense flame, discriminator circuitry connecting said sensor and sai output device for placing said output device in said first state in response to the production of a fluctuating output signal by said flame sensor, and flame failure transition responsive circuitry connected to said flame sensor for placing said output device in said second state in response to an abrupt decrease in flame and independently of fluctuations of the signal produced by said flame sensor, said flame failure transition responsive circuitry including time delay circuitry comprising a series capacitor connected in series between said flame sensor and said output device and a circuit of asymmetric resistance characteristics connected in shunt with said flame sensor.
Claim 12
Dependent Claim
170 words
A combustion supervision system comprising a flame sensor for producing an output signal in response to the sensing of flame in a supervised combustion chamber, an output device arranged to assume a first state indicative of flame when said sensor senses flame and a second state indicative of the absence of flame when said sensor does not sense flame, discriminator circuitry connecting said sensor and sai output device for placing said output device in said first state in response to the production of a fluctuating output signal by said flame sensor, and flame failure transition responsive circuitry connected to said flame sensor for placing said output device in said second state in response to an abrupt decrease in flame and independently of fluctuations of the signal produced by said flame sensor, said flame failure transition responsive circuitry including time delay circuitry comprising a series capacitor connected in series between said flame sensor and said output device and a circuit of asymmetric resistance characteristics connected in shunt with said flame sensor.
Claim 13
Dependent Claim
24 words
The system as claimed in claim 9 wherein said flame failure transition responsive circuitry is connected between said flame sensor and said discriminator circuitry.
Claim 14
Dependent Claim
29 words
The system as claimed in claim 9 wherein said flame failure transition responsive circuitry is connected between said flame sensor and said output device in shunt with said discriminator.
Claim 15
Dependent Claim
62 words
The system as claimed in claim 8 wherein said flame sensor is a lead sulfide photocell, said discriminator circuitry includes a band pass amplifier tuned to pass signals in the 5-25 Hertz range, and said output device is the coil of a flame relay, and further including coupling means for applying output signals produced by said photocell to said band pass amplifier.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |