WO2000052389A1 - Dispositif de surveillance de flammes pour bruleurs a mazout, a proprietes adaptatives - Google Patents

Dispositif de surveillance de flammes pour bruleurs a mazout, a proprietes adaptatives Download PDF

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Publication number
WO2000052389A1
WO2000052389A1 PCT/EP2000/001464 EP0001464W WO0052389A1 WO 2000052389 A1 WO2000052389 A1 WO 2000052389A1 EP 0001464 W EP0001464 W EP 0001464W WO 0052389 A1 WO0052389 A1 WO 0052389A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
sensor
flame
amplifier circuit
monitoring
Prior art date
Application number
PCT/EP2000/001464
Other languages
German (de)
English (en)
Inventor
Willi Nyffenegger
Daniel Albrecht
Original Assignee
Satronic Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Satronic Ag filed Critical Satronic Ag
Priority to DE50002643T priority Critical patent/DE50002643D1/de
Priority to EP00916859A priority patent/EP1157236B1/fr
Priority to AT00916859T priority patent/ATE243831T1/de
Priority to AU38059/00A priority patent/AU3805900A/en
Publication of WO2000052389A1 publication Critical patent/WO2000052389A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
    • F23N5/082—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/22—Flame sensors the sensor's sensitivity being variable

Definitions

  • Device for flame monitoring in oil burners with a sensor (10) and an amplifier circuit (11) for evaluating the signal detected by the sensor (10)
  • Amplifier circuit (1 1) to the actual level of the sensor (10) detected
  • control signal (17) adjusts the amplitude of the signal (12) detected by the sensor (10) to the defined amplitude.
  • Flame signal (31) is generated, which contains information about the presence of a flame of the oil burner.
  • the device characterized in that the amplifier circuit (11) is a self-test signal (33) can be fed, which is used to check the function of the amplifier circuit (11).
  • the device according to claim 9 characterized in that the self-test signal (33) of a second voltage divider device (34) can be supplied, which a
  • Input signal for the filter device (14) forms.
  • the device according to claim 9 or 10 characterized in that the second voltage divider device (34) reduces the gain of a first bandpass filter (19) depending on a clock pulse of the self-test signal (33), the functional check of the actual Flame monitoring is permanently superimposed.
  • the device according to one or more of claims 1 to 15, characterized in that the amplifier circuit (11) is integrated in a microprocessor, in particular in a microprocessor-controlled control unit.
  • the invention relates to a device for flame monitoring in oil burners according to the preamble of claim 1.
  • Such devices for flame monitoring usually have a sensor that detects the light from the flame of the burner and generates a corresponding signal therefrom, and an amplifier circuit for evaluating the signal detected by the sensor.
  • the flame light to be detected by the sensor has a large dynamic range depending on the operating status of the oil burner.
  • the sensor detects only a small signal, whereas in the case of a “hot” oil burner there is a large signal.
  • the present invention is based on the problem of creating a device for flame monitoring in oil burners that is optimized.
  • Fig. 1 shows an inventive device for flame monitoring in oil burners as a schematic block diagram.
  • the device according to the invention for flame monitoring in oil burners shown in the drawing has a sensor 10 and an amplifier circuit 11 assigned to sensor 10.
  • Sensor 10 monitors a flame (not shown) of an oil burner (also not shown).
  • the sensor 10 is preferably an infrared sensor which detects the light of the flame of the oil burner in the infrared range and generates a corresponding signal 12 from it.
  • the amplifier circuit 11 is used to evaluate the signal 12 detected by the sensor 10.
  • the sensor 10 need not be designed as an infrared sensor. Rather, other sensors can be used to monitor the flame of the oil burner.
  • the amplifier circuit 11 automatically adjusts its sensitivity to the actual level of the signal 12 detected by the sensor 10. This ensures that the amplifier circuit 11 and thus the device for flame monitoring consisting of the sensor 10 and the amplifier circuit 11 is independent of the state of the burner, that is to say it works reliably over the entire dynamic range of the flame of the oil burner.
  • the amplifier circuit 11 has a voltage divider device 13, a filter device 14, a rectifier device 15 and an amplifier device 16.
  • the signal 12 detected by the sensor 10 and a control signal 17 serve as input variables for the voltage divider device 13.
  • the signal 12 detected by the sensor 10 and the control signal 17 are offset against one another such that the amplitude of the signal 12 detected by the sensor is set to a defined amplitude becomes.
  • This signal set to the defined amplitude is the output signal 18 of the voltage divider device 13, which is fed to the filter device 14 as an input signal.
  • the filter device 14 comprises two filters, namely a first bandpass filter 19 and a second bandpass filter 20 connected downstream of the first bandpass filter 19 3
  • the output signal 18 of the voltage divider device 13 is accordingly filtered, and an output signal 21 of the filter device 14 is then fed to the rectifier device 15, which generates a rectified output signal 22 from the output signal 21 in AC voltage.
  • the output signal 22 is consequently a filtered, rectified output signal of the sensor 10 set to the defined amplitude.
  • the rectifier device 15 has a resistor 24 connected in series with a diode 23, whereby the series connection of the diode 23 and the resistor 24 are each connected in parallel with a capacitor 25 and a further resistor 26.
  • the output signal 22 of the rectifier device 15 is fed to the amplifier device 16 as an input signal.
  • the amplifier device 16 is supplied with a reference signal provided via correspondingly dimensioned resistors 27, 28 and 29 as the desired value.
  • the reference signal for the amplifier device 16 is tapped between the resistors 27 and 28 according to FIG.
  • the amplifier device 16 generates the control signal 17 from these input signals.
  • a configuration of the amplifier device 16 is particularly advantageous if the latter has a proportional / integral gain characteristic.
  • the output signal 22 of the rectifier device 15 is additionally fed to a comparator 30 as an input signal which compares the output signal 22 of the rectifier device 15 with a reference value which is tapped between the resistors 29 and 27.
  • This reference value for the comparator 30 is, for example, 70% of the defined amplitude to which the signal 12 determined by the sensor 10 is set in the voltage divider device 13.
  • the comparator 30 provides a flame signal which contains information about the presence or absence of the flame of the oil burner.
  • the sensitivity of the amplifier circuit 11 is optimized over the entire dynamic range of the flame of the oil burner.
  • the amplifier device 16 has a proportional / integral gain characteristic.
  • the amplification characteristic of the amplifier device 16 is designed in such a way that an output signal 22 that grows larger is quickly compensated for, while an output signal 22 that is becoming smaller is slowly adjusted. This ensures that at a 4
  • the output signal 22 quickly falls below the threshold value of preferably 70%, and the comparator can thus report a corresponding flame failure safely and quickly.
  • the amplification characteristic of the amplifier device 16 can also be changed by a signal 32.
  • This property is important when the device according to the invention is to be used in multi-stage oil burners.
  • a sudden change in the lighting conditions with respect to the flame of the oil burner can take place. It must be reliably prevented here that a reduction in the signal 12 detected by the sensor 10 caused thereby is interpreted as a flame breakdown or flame failure.
  • the gain characteristic of the amplifier device 16 is set to a maximum in synchronism with a step changeover of the oil burner via the signal 32.
  • the amplifier circuit 11 is made selectively so at the moment when the oil burner is switched over in stages that in the event of a sudden drop in the signal 12 as a result of a stage changeover, the presence of a flame in the oil burner can be reliably concluded.
  • the amplifier circuit 11 has a self-test function.
  • the amplifier circuit 11 can be supplied with a self-test signal 33 via a second voltage divider device 34.
  • the self-test signal 33 serves the second voltage divider device 34 as an input variable, an output variable 35 of the second voltage divider device 34 of the filter device 14, namely the first bandpass filter 19, being made available as an input variable.
  • the self-test signal 33 is a sequence of pulses, the gain of the first band-pass filter 19 being reduced to preferably one third of its nominal gain via the voltage divider device 34 in synchronism with the pulses of the self-test signal 33.
  • An evaluation circuit (not shown), which is connected downstream of the comparator 30, checks whether the comparator 30 detects the signal reduction carried out in time with the pulses of the self-test signal 33. If this is the case, the amplifier circuit 11 operates without errors. It is important here that the amplification of the first bandpass filter 19 is not reduced to zero via the voltage divider device 34, but is only preferably divided into three or even halved. If the amplifier device 16 overrides due to an error, the third or the halving of the amplification of the first bandpass filter 19 is not sufficient so that the comparator 30 can react accordingly to the pulses of the self-test signal 33. An error is thus recognized. However, would reinforce the first bandpass age 19 5 are reduced to zero, the comparator 30 would also react to the pulses in the self-test signal in the case of an overdriving amplifier device 16 and would then not be able to recognize the error.
  • the device according to the invention from the sensor 10 and the adaptive amplifier circuit 11 is integrated into a digital, microprocessor-controlled control device.
  • the device according to the invention can namely be optimally used.
  • a digital, microprocessor-controlled control device or regulating device can thus directly evaluate the output variable 31 of the comparator 30.
  • a digital control device or control device can also generate the self-test signal 33 and the signal 32 safely and easily.
  • the control signal 17 can be easily evaluated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)

Abstract

Dispositif de surveillance de flammes pour brûleurs à mazout, qui possède un capteur (10) et un circuit amplificateur (11). Selon la présente invention, la sensibilité du circuit amplificateur (11) s'adapte automatiquement au niveau effectif du signal (12) détecté par le capteur (10), ce qui garantit à ce dispositif une sensibilité optimale sur toute la plage dynamique d'une flamme à surveiller.
PCT/EP2000/001464 1999-03-02 2000-02-23 Dispositif de surveillance de flammes pour bruleurs a mazout, a proprietes adaptatives WO2000052389A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE50002643T DE50002643D1 (de) 1999-03-02 2000-02-23 Vorrichtung zur flammenüberwachung bei ölbrennern mit adaptiven eigenschaften
EP00916859A EP1157236B1 (fr) 1999-03-02 2000-02-23 Dispositif de surveillance de flammes pour bruleurs a mazout, a proprietes adaptatives
AT00916859T ATE243831T1 (de) 1999-03-02 2000-02-23 Vorrichtung zur flammenüberwachung bei ölbrennern mit adaptiven eigenschaften
AU38059/00A AU3805900A (en) 1999-03-02 2000-02-23 Device for monitoring the flames of oil burners, with adaptive properties

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19908945.0 1999-03-02
DE19908945A DE19908945C1 (de) 1999-03-02 1999-03-02 Vorrichtung zur Flammenüberwachung bei Ölbrennern mit adaptiven Eigenschaften

Publications (1)

Publication Number Publication Date
WO2000052389A1 true WO2000052389A1 (fr) 2000-09-08

Family

ID=7899348

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/001464 WO2000052389A1 (fr) 1999-03-02 2000-02-23 Dispositif de surveillance de flammes pour bruleurs a mazout, a proprietes adaptatives

Country Status (6)

Country Link
EP (1) EP1157236B1 (fr)
AT (1) ATE243831T1 (fr)
AU (1) AU3805900A (fr)
DE (2) DE19908945C1 (fr)
ES (1) ES2204544T3 (fr)
WO (1) WO2000052389A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10247168B4 (de) * 2002-10-10 2004-09-09 Karl Dungs Gmbh & Co. Kg Flammenwächter mit Selbsttestfunktion und Verfahren zur Betriebsüberwachung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903418A (en) * 1973-12-14 1975-09-02 Forney International Infrared dynamic flame detector
GB1425456A (en) * 1972-09-23 1976-02-18 Clarke Chapman Ltd Method and apparatus for monitoring electromagnetic radiation
US4039844A (en) * 1975-03-20 1977-08-02 Electronics Corporation Of America Flame monitoring system
EP0474430A1 (fr) * 1990-09-06 1992-03-11 Hamworthy Combustion Equipment Limited Dispositif et procédé de contrôle de flammes
JPH05256441A (ja) * 1992-03-13 1993-10-05 Ishikawajima Harima Heavy Ind Co Ltd 燃焼診断装置
DE19650972A1 (de) 1996-12-09 1998-06-10 Elbau Elektronik Bauelemente G Verfahren und Anordnung zur Überwachung und Regelung von Verbrennungsprozessen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1425456A (en) * 1972-09-23 1976-02-18 Clarke Chapman Ltd Method and apparatus for monitoring electromagnetic radiation
US3903418A (en) * 1973-12-14 1975-09-02 Forney International Infrared dynamic flame detector
US4039844A (en) * 1975-03-20 1977-08-02 Electronics Corporation Of America Flame monitoring system
EP0474430A1 (fr) * 1990-09-06 1992-03-11 Hamworthy Combustion Equipment Limited Dispositif et procédé de contrôle de flammes
JPH05256441A (ja) * 1992-03-13 1993-10-05 Ishikawajima Harima Heavy Ind Co Ltd 燃焼診断装置
DE19650972A1 (de) 1996-12-09 1998-06-10 Elbau Elektronik Bauelemente G Verfahren und Anordnung zur Überwachung und Regelung von Verbrennungsprozessen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 023 (M - 1541) 14 January 1994 (1994-01-14) *

Also Published As

Publication number Publication date
AU3805900A (en) 2000-09-21
EP1157236A1 (fr) 2001-11-28
EP1157236B1 (fr) 2003-06-25
ES2204544T3 (es) 2004-05-01
DE50002643D1 (de) 2003-07-31
DE19908945C1 (de) 2000-11-02
ATE243831T1 (de) 2003-07-15

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