US3616997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion regulator
Assignee: Kockums Mekaniska Verkstads AB
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Filing: 1969-05-19
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Granted: 1971-11-02
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Expires: 1989-05-19
Abstract
Abstract A combustion-regulating system for steam boilers including a stem pressure transducer and a steam pressure requirement signal connected to a proportional circuit and integrating circuit, whose output is connected to an input of an amplifier stage which is differentially connected and contained in a first control circuit, whose output is connected with a positioning unit contained in the first control circuit. Said amplifier stage is also connected to an input of a second differentially connected amplifier stage connected in a second control circuit, whose output is connected with a positioning unit contained in the second control circuit. The input of the amplifier stage of the first control circuit is connected to the fuel oil pressure transducer and the input of the amplifier stage of the second control circuit is connected to an air flow sensing device and a fuel oil pressure transducer.
Inventors
- 👤 Jerk Gunnar Oldenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:37
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/02; F23N1/022; F23N1/08; F23N1/10; F23N1/102; F23N2223/00; F23N2223/12; F23N2225/00; F23N2225/02; F23N5/00; F23N5/003; F23N5/006
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
264 words
In a system for regulating combustion for a steam boiler including at least one burner supplied by a fuel oil control valve operated by a first control circuit responsive to fuel oil pressure and having an air flow control unit operated by a second control circuit including an air flow sensing device; means generating a signal indicating a desired steam pressure, steam pressure transducer means for generating a signal indicating an actual steam pressure, a proportional and integrating circuit responsive to the difference between a signal indicating the actual steam pressure and said signal indicating the desired steam pressure, a first control circuit including a differentially connected amplifier device connected to receive the output of said integrating circuit, a positioning unit responsive to said first control circuit connected for controlling a fuel valve in response to output from said amplifier device, a second differentially connected amplifier device comprising a second control circuit having one input taken from said output of the first control circuit and a second input responsive to the output of said proportional and integrating circuit, a second positioning unit connected for response to said second control circuit and in control of air flow, a fuel oil pressure detecting transducer connected to a fuel supply to the boiler, an air flow sensing device connected to an air supply to the boiler the input of said first control circuit being responsively connected to said fuel oil pressure transducer and the input of said second control circuit being connected for response to the air flow sensing device and to the fuel oil pressure transducer.
Claim 2
Dependent Claim
264 words
In a system for regulating combustion for a steam boiler including at least one burner supplied by a fuel oil control valve operated by a first control circuit responsive to fuel oil pressure and having an air flow control unit operated by a second control circuit including an air flow sensing device; means generating a signal indicating a desired steam pressure, steam pressure transducer means for generating a signal indicating an actual steam pressure, a proportional and integrating circuit responsive to the difference between a signal indicating the actual steam pressure and said signal indicating the desired steam pressure, a first control circuit including a differentially connected amplifier device connected to receive the output of said integrating circuit, a positioning unit responsive to said first control circuit connected for controlling a fuel valve in response to output from said amplifier device, a second differentially connected amplifier device comprising a second control circuit having one input taken from said output of the first control circuit and a second input responsive to the output of said proportional and integrating circuit, a second positioning unit connected for response to said second control circuit and in control of air flow, a fuel oil pressure detecting transducer connected to a fuel supply to the boiler, an air flow sensing device connected to an air supply to the boiler the input of said first control circuit being responsively connected to said fuel oil pressure transducer and the input of said second control circuit being connected for response to the air flow sensing device and to the fuel oil pressure transducer.
Claim 3
Dependent Claim
40 words
In a system according to claim 1 differentially connected amplifier means connected for response to a steam pressure requirement signal and supplying said signal to said proportional and integrating circuit for proportional effect on the output from said last-named circuit.
Claim 4
Dependent Claim
51 words
In the system of claim 1, rapid switching means under control of a trip signal from a turbine system supplied by said steam boiler for supplying a time-derivative signal to said proportion and integrating circuit when the steam supply to said turbine engine system is shut off by a safety system.
Claim 5
Dependent Claim
43 words
In a system according to claim 1, said differentially connected amplifiers comprising operational amplifiers connected for output according to the difference between input signals and said proportional and integrating circuit comprising an operational amplifier connected for producing a proportional and integrated signal output.
Claim 6
Dependent Claim
50 words
In the system of claim 1, said first control circuit having said amplifier device connected for response to the output signal from said second control circuit by way of zener diode means to the output signal from the first control circuit according to sensed air flow below a set value.
Claim 7
Dependent Claim
38 words
In the system of claim 1, said second control circuit having input to said amplifier device thereof derived from an input signal to said positioning unit controlling fuel delivered through RC network means to provide a differentiated signal.
Claim 8
Dependent Claim
51 words
In the system of claim 1 means connected to said boiler for detecting oxygen content of flue gases and means responsive thereto for varying the operation of the flow control unit to reduce air flow according to oxygen detected, said means operating to provide an input to said second control circuit.
Claim 9
Dependent Claim
37 words
In a system according to claim 7 said means for detecting oxygen comprising an integrator-connected operational amplifier having a feedback circuit including Zener diode means for limiting the magnitude of signal applied to the second control circuit.
Claim 10
Dependent Claim
26 words
In a system according to claim 1, transistor amplifier means connected to the output for said control circuits to enhance the signals to said positioning units.
Claim 11
Dependent Claim
37 words
In the system of claim 1, manually operable control signal generating means connected to each said control circuit, including further differentially connected operational amplifier means responsive to said manually operable means supplying input for said integrating circuit.
Claim 12
Dependent Claim
40 words
In the system of claim 10, means connecting said manually operable means such that output from one said further operational amplifier means provides a gauge-operating signal and the other said further operational amplifier means provides input to said integrating means.
Claim 13
Dependent Claim
34 words
In the system of claim 1, said second integrating circuit means for simulating a steam demand signal and generating a fuel control signal comprising amplifier means responsive to said output of said integrating circuit.
Claim 14
Dependent Claim
59 words
In the system of claim 1, comparator-connected operational amplifier means connected responsiveLy to the output of said proportional and integrating circuit, and amplifier means connected for response to the output of said comparator-connected amplifier means, for supplying a rapid start or stop signal for a burner, and relay means responsively connected thereto to furnish start or stop actuation power.
Claim 15
Dependent Claim
50 words
In the system of claim 1, amplifier means for controlling an actuation signal to a further positioning unit, being connected for response to output from said proportional and integrating circuit and supplying an actuating signal for a steam-dumping valve upon developing a predetermined output and a steam-dumping valve connected thereto.
References Cited (Backward Citations)
US3284615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |