EP3372898A2 - Dispositif de surveillance de flamme pour un appareil de chauffage à combustible - Google Patents

Dispositif de surveillance de flamme pour un appareil de chauffage à combustible Download PDF

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Publication number
EP3372898A2
EP3372898A2 EP18152420.8A EP18152420A EP3372898A2 EP 3372898 A2 EP3372898 A2 EP 3372898A2 EP 18152420 A EP18152420 A EP 18152420A EP 3372898 A2 EP3372898 A2 EP 3372898A2
Authority
EP
European Patent Office
Prior art keywords
combustion chamber
photoelectric sensor
flame
passage opening
wall
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP18152420.8A
Other languages
German (de)
English (en)
Other versions
EP3372898A3 (fr
Inventor
Stefan Koch
Nico Soppa
Hans-Michael Wardenga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Thermal Commercial Vehicles Germany GmbH
Original Assignee
Valeo Thermal Commercial Vehicles Germany GmbH
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
Priority claimed from DE202017101404.5U external-priority patent/DE202017101404U1/de
Application filed by Valeo Thermal Commercial Vehicles Germany GmbH filed Critical Valeo Thermal Commercial Vehicles Germany GmbH
Publication of EP3372898A2 publication Critical patent/EP3372898A2/fr
Publication of EP3372898A3 publication Critical patent/EP3372898A3/fr
Withdrawn legal-status Critical Current

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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
    • F23N2229/18—Flame sensor cooling means

Definitions

  • the invention relates to a flame-monitoring arrangement for a fuel-operated heater according to the preamble of claim 1, and to a heater equipped with such a flame-monitoring arrangement according to claim 10.
  • a flame monitoring arrangement having heaters such as the DE 20 2007 011 203 A1 can be removed, can be designed either for heating water or for heating air and are used in particular as mobile heaters in passenger transport vehicles, such as cars or buses or even in commercial vehicles such as trucks or rail vehicles for use. If the vehicle is operated with diesel fuel, it is preferably also used as fuel for the heater.
  • FIG. 1 a known from the prior art heater described, for example, may have a circular cylindrical combustion tube 2, which encloses an elongated combustion chamber 3, at one end of a covered by a hood 4 heater head 5 is located.
  • the combustion tube 2 protrudes into the interior of a double-walled heat exchanger, between whose inner wall 6 and outer wall 7, a flow path is formed for the heat transfer medium to be heated.
  • the heat transfer medium which may be water or air or another suitable heat transfer medium, is supplied via an inflow pipe 9 and discharged via a discharge pipe 10.
  • the outer diameter of the combustion chamber 2 at its front end opposite the open hearth 2 is smaller than the inner diameter of the inner wall 6 of the heat exchanger, and between the open end of the combustion tube 2 and the opposite region 11 of the inner wall 6 of the heat exchanger is a distance, so that the exhaust gases generated during the burning of the flame 12 escape from the open end of the combustion tube 2 and can flow countercurrently on the present between the combustion tube 2 and the inner wall 6 of the heat exchanger flow path to a arranged in the vicinity of the heater head 5 exhaust outlet 14.
  • the subunits of the heater 1 located inside the hood 4 of the heater head 5 are shown in a highly schematic manner and only insofar as they are necessary for the understanding of the present invention; In particular, the blower motor, the fuel pump with its solenoid valve and the fuel supply and return lines are omitted for better clarity.
  • the hood 4 has on its the combustion tube 2 axially opposite side of a suction port 16 for outside air, which is promoted by a symbolically indicated fan 17 in the direction of the combustion tube 2, as indicated by flow arrows.
  • the outside air flows around a control unit 18, which on its side facing the combustion chamber 2 carries a designed as a photoelectric element flame detector 20 and a spark generator 22 with an ignition electrode 23 which extends into the vicinity of the front of a spray nozzle 25.
  • frustoconical swirl body 26 in whose peripheral wall slots 27 are formed, through which funded by the fan 17 outside air into the interior of the swirl body 26 and from there into the combustion chamber 3 can occur.
  • the air is set in rotation, so that a turbulence and good mixing takes place with the fuel jet 29 emitted by the atomizer nozzle 25 as a droplet mist and, after ignition, a uniform and hot-burning flame 12 is formed.
  • the spray nozzle 25 and the free end of the ignition electrode 23 are surrounded by a frustoconical hollow baffle body 30, which connects with its in the figures right, open face continuously to the swirler 26, while its opposite end by a frequently as Flap plate designated wall 31 is closed.
  • a frustoconical hollow baffle body 30 and the swirler 26 directly into each other and into the interior of the combustion tube 2 and thus together form a combustion chamber.
  • the wall 31 of the combustion chamber has a distance from the flame detector 20 and the existing between them free space is flushed by the funded by the fan 17 outside air, resulting in the advantage that overheating of the control unit 18 and the flame detector 20 is avoided.
  • the wall 31 has a light passage opening 33 which is positioned so that, when the flame 12 is burning, a portion of the light emitted by it can fall on the flame detector 20, which is designed as a photoelectric sensor and emits a control signal whose amplitude is the presence or absence of a Flame 12 displays and which can be evaluated by the control unit 18 accordingly.
  • the arrangement is such that the flame detector perceives as possible no light from possibly nachglühenden parts of the combustion chamber 3.
  • the light passage opening 33 is closed by a translucent, heat-resistant, platelet-shaped body 34, such as a mica washer, the the wall 31 is attached.
  • the invention has the object, a flame detector arrangement referred to in the preamble of claim 1 type so that the maintenance periods are significantly extended and a significantly improved reliability of the flame detection is achieved.
  • the invention provides the features mentioned in claim 1.
  • This measure according to the invention is based on the finding that when operating heaters with a conventional flame monitoring arrangement, especially when the fan is operating in a dusty environment, for example at construction sites or in desert or steppe areas and the like, outside air with a high particle content is sucked in, comes to a comparatively rapid contamination of both the translucent body and the flame guard. Also, in fuels with high soot potential (some biodiesel) rapid sooting of the combustion chamber facing side of the light passage opening covering, translucent body occur.
  • the translucent, platelet-shaped body previously provided at the light passage opening is not simply omitted, but replaced by a hollow body, which bridges the distance between the light passage opening and the photoelectric sensor of the flame detector and produces a dust-proof optical connection between these two components, that a part of the light emitted by the flame can pass through it to the photoelectric sensor and can be recognized by it correctly.
  • the pollution occurring in the prior art and / or sooting is permanently avoided.
  • the hollow body consists of a light-impermeable material, so that afterglow effects of the combustion chamber, whose light can pass through the slots of the swirl body and / or the baffle plate body, for example, can not be perceived by the photoelectric sensor and interpreted by the control unit as a flame.
  • a reinforcement of this effect can be achieved in that the hollow body has a little reflective inner wall.
  • the inside of the hollow body can also be designed to be highly reflective, which is particularly advantageous if, as is the case with the use of certain fuels, the spectrum of the burning flame in the combustion chamber against the sensitivity spectrum of the photoelectric sensor so is shifted strongly that this may not perceive the flame easily.
  • a hollow body which is highly reflective on the inside considerably improves the detectability of the flame.
  • the hollow body is formed by an elongate tube which terminates largely dust-tight both at the photoelectric sensor and at the light passage opening.
  • This tube may have a rectangular, circular or oval cross-section.
  • a particular advantage of the solution according to the invention is that it can be implemented in a cost-effective manner and is ideally suited both as a solution for newly developed heaters and for retrofitting of devices already in use.
  • a spring arrangement which biases the hollow body to the photoelectric sensor, so that it bears dust-protected on the photoelectric sensor or its carrier. If the hollow body is an elongated tube, then it can project with its end opposite the photoelectric sensor through the light passage opening into the interior of the combustion chamber, whereby temperature-induced changes in length of the hollow body can be compensated without causing mechanical tension.
  • Fig. 2 consists of the main difference of the heater 1 'shown here to the in Fig. 1 shown heater 1 in that the plate-shaped, translucent body 34 is omitted, and that instead of a tubular hollow body 36 extends from the light passage opening 33 to the photoelectric sensor 20, which he projects into it so that it surrounds in dust-proof.
  • This hollow body 36 may be attached to the controller 18 and / or the photoelectric sensor 20 and / or to the wall 31 in any suitable manner.
  • the tubular hollow body 36 has a radially projecting projection 38 which may be formed, for example, by an annular flange and against which an axial end of a coil spring 40 abuts, which coaxially surrounds the tubular hollow body 36 and at its other end to the wall 31st supported.
  • a holder for the tubular hollow body 36 is achieved, which requires little technical effort, is easy to install and the tubular hollow body 36, even with strong shocks, as they often occur in the use of such a heater in a vehicle safely holds in place ,
  • the tubular hollow body 36 dust-protected then ends on the wall 31, it protrudes at the in Fig. 3 shown variant through the light passage opening 33 into the interior of the baffle plate body 30 inside.
  • the length of the helical spring 40 is dimensioned so that it is in the shown mounting state, in which the tubular hollow body 36 on the support of the photoelectric sensor 20, that is, here on the wall 31 opposite the wall of the control unit 18, between the projection 38 and the wall 31 is partially compressed.
  • the Tubular hollow body 36 is thereby kept in a stable position and can expand or contract freely in the axial direction, so that in this area based on temperature changes mechanical stresses are avoided.
  • the inside of the tubular hollow body 36 is formed by a corresponding surface treatment or material selection low reflective to prevent reflections that emanate after the extinction of the flame of nachglühenden areas of the combustion chamber 3, are perceived by the photoelectric sensor and interpreted by the control unit as a flame.
  • a heater comprises a combustion chamber with a wall enclosing it, in which a light passage opening is formed, and a photoelectric sensor arranged outside the combustion chamber serving as a flame monitor, which detects the light emerging from the light passage opening of the flame and emits an electrical control signal, by which it can be detected whether the flame is burning or is present or not.
  • control unit 18 is arranged outside the hood 4 and the photoelectric sensor forming the flame detector 20 is mounted on another support arranged inside the hood 4, which lies opposite the wall 31 having the light passage opening 33.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
EP18152420.8A 2017-03-10 2018-01-18 Dispositif de surveillance de flamme pour un appareil de chauffage à combustible Withdrawn EP3372898A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202017101404.5U DE202017101404U1 (de) 2017-03-10 2017-03-10 Flammen-Überwachungsanordnung für ein mit Brennstoff arbeitendes Heizgerät
DE102017107592.5A DE102017107592B4 (de) 2017-03-10 2017-04-07 Flammen-Überwachungsanordnung für ein mit Brennstoff arbeitendes Heizgerät

Publications (2)

Publication Number Publication Date
EP3372898A2 true EP3372898A2 (fr) 2018-09-12
EP3372898A3 EP3372898A3 (fr) 2018-11-21

Family

ID=61017803

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18152420.8A Withdrawn EP3372898A3 (fr) 2017-03-10 2018-01-18 Dispositif de surveillance de flamme pour un appareil de chauffage à combustible

Country Status (1)

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EP (1) EP3372898A3 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2615596A1 (fr) * 1987-05-18 1988-11-25 Alsace Gaz Ind Sa Dispositif de controle d'une flamme localisee dans une enceinte
US5120975A (en) * 1990-03-23 1992-06-09 General Electric Company Gas turbine flame detection system with reflected flame radiation attenuator
DE102010063524A1 (de) * 2010-12-20 2012-06-21 Bodo Wyrwa Einstellbarer Brenner für vergasten flüssigen Brennstoff, insbesondere an Öl-Heizungsanlagen und ein mittels des einstellbaren Brenners realisiertes Verfahren
US9435690B2 (en) * 2012-06-05 2016-09-06 General Electric Company Ultra-violet flame detector with high temperature remote sensing element
DE202017101404U1 (de) * 2017-03-10 2017-05-04 Spheros Gmbh Flammen-Überwachungsanordnung für ein mit Brennstoff arbeitendes Heizgerät

Also Published As

Publication number Publication date
EP3372898A3 (fr) 2018-11-21

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