EP1156277B1 - Protection against flashback - Google Patents

Protection against flashback Download PDF

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Publication number
EP1156277B1
EP1156277B1 EP20010107963 EP01107963A EP1156277B1 EP 1156277 B1 EP1156277 B1 EP 1156277B1 EP 20010107963 EP20010107963 EP 20010107963 EP 01107963 A EP01107963 A EP 01107963A EP 1156277 B1 EP1156277 B1 EP 1156277B1
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EP
European Patent Office
Prior art keywords
damper
protection apparatus
intake duct
securing element
air
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.)
Expired - Lifetime
Application number
EP20010107963
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German (de)
French (fr)
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EP1156277A3 (en
EP1156277A2 (en
Inventor
Michael Fechner
Adam Pohlmüller
Uwe Wöllert
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.)
Truma Geraetetechnik GmbH and Co KG
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Truma Geraetetechnik GmbH and Co KG
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Publication of EP1156277A2 publication Critical patent/EP1156277A2/en
Publication of EP1156277A3 publication Critical patent/EP1156277A3/en
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Publication of EP1156277B1 publication Critical patent/EP1156277B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L13/00—Construction of valves or dampers for controlling air supply or draught
    • F23L13/02—Construction of valves or dampers for controlling air supply or draught pivoted about a single axis but having not other movement

Definitions

  • the invention relates to a back burner fuse for an air intake duct of a combustion heater.
  • Such a combustion heater as shown for example in DE 191 85 67 U for a caravan, sucks the necessary combustion air via an air intake duct from the vicinity of the caravan. This ensures that the heater does not draw its combustion air from the interior of the caravan, which could endanger the occupants of the caravan.
  • the air intake duct connects to a side or bottom wall of the caravan housing. Due to the flame in the heater and the rising above her in a fireplace hot combustion gases creates a flow that promotes fresh air from the outside via the air intake into the heater.
  • a burn back fuse for protection from a deflagration flame is known.
  • the back burner has a flap which is supported in the open position against a prestressed spring.
  • the spring is held by a securing element in the biasing position, wherein the securing element consists of a fusible material. When the fuse element melts, the spring is released and closes the flap.
  • the invention has for its object to provide a backup fuse for an air intake duct, which reliably prevents damage to the air intake duct due to a flashback in the air intake duct flame combustion heating.
  • the back burner according to the invention has a arranged in the air intake duct, pivotable about an axis flap, which is held by a securing element in a non-obstructing air flow in the air intake duct open position.
  • the fuse element connects the flap with an outer wall of the air intake duct.
  • the flap can be reset only in the context of a detailed examination - preferably by specialist personnel - and fixed in the open position by means of the effect brought about by a new securing element holding connection. On this occasion, the cause of the flashback of the flame can be investigated and z. B. be remedied by structural changes.
  • the flap has an asymmetrical weight distribution with respect to its pivot axis, which forces the flap into the closed position. Due to the asymmetrical weight distribution, the z. B. can also be achieved by an additional weight on the plate, it is possible that the flap automatically pivoted alone due to the force of gravity when releasing the holding connection in the closed position, without further aids such as springs are required.
  • the flap with its axis can be particularly easy to assemble, if openings are provided in the outer wall of the air intake duct according to another advantageous development, which are accessible from the outside, so that from there the axis can be inserted into the air intake duct.
  • the axle can then be secured axially via a pipe, which may be part of the air intake duct.
  • the strength of the securing element as a function of the temperature is advantageously selected such that the securing element when it reaches the temperature limit value either melts or becomes so soft that it can no longer hold the flap against the outside wall.
  • Fig. 1 shows a portion of an air intake duct 1 for a combustion heater, wherein a flap 2 in the open position and - dash-dotted lines - is shown in the closed position.
  • the shown portion of the air intake duct 1 consists of a bottom connecting piece 3 and a deferred flexible tube 4 with a substantially circular cross-section.
  • the tube 4 is guided in the direction of an arrow 5 to an atmospheric gas heater, not shown, which consumes the sucked air.
  • the bottom connection piece 3 is screwed into the bottom of a caravan, so that air in the direction of an arrow 6 can get into the air intake duct 1.
  • the flap 2 is pivotally supported by the axis 7.
  • the axis 7 rotates with the flap 2 or is fixed, while only the flap 2 on the axis 7 is pivotable.
  • the flap 2 is pivotable at least between the open position shown in FIG. 1 by a solid line and the closed position shown as a dotted line.
  • the closed position is ensured by a stop 9, while the open position is held by a securing element 10. It can be seen that, in its open position, the flap 2 does not substantially hinder the air flow in the air intake duct 1, while in its closed position it substantially prevents air flow.
  • the securing element 10 is made of a material with a low melting point, preferably a plastic material, and is manufactured in one piece. With an armature 11, the securing element 10 is inserted into a half-side recess 12 shown in FIG. 2 in a perspective large-scale representation.
  • the formed in the outer wall 8 recess 12 is open at the front end of the bottom connecting piece 3, so that the substantially plate-shaped armature 11 can be pushed in the axial direction of the bottom connecting piece 3 against a located behind the recess 12 sealing ring 13. This condition can also be seen in the assembly according to FIG. 3.
  • the fork-shaped part 15 is shown enlarged in Fig. 5.
  • a prong of the fork-shaped part 15 has a hook 16, which engages when sliding the securing element 10 on the flap 2 in the open position shown in Fig. 1 in a recess 17 in the existing of a thin stainless steel sheet flap 2.
  • An opposite of the hook 16 tines 18 of the fork-shaped part 15 additionally springs against it, whereby the flap 2 is reliably held on the fork-shaped part 15.
  • the securing element 10 thus forms a retaining connection between the flap 2 and the outer wall 8, which securely holds the flap 8 in the open position.
  • the securing element 10 is made of a material with a low melting point or a strong decreasing strength under heat strength.
  • the material must be selected such that, when a predetermined temperature limit value is reached, it has such a low strength that the holding connection between the outer wall 8 and the flap 2 is released. This is z. B. possible because the fuse element 10 melts at its web 14.
  • the fork-shaped part 15 is so soft that the flap 2 with its recess 17 from the clamping between the hook 16 and the prongs 18 can slip out.
  • the material of the securing element 10 should be that which has the lowest melting point of all materials used in the air intake duct 1.
  • the fuse element 10 has the lowest heat resistance of all parts located in the exhaust path, it first loses its strength, whereby the retaining connection is released.
  • the flap 2 is free to move and can reach the closed position and close the air intake.
  • a spring device for. B. to use a tensile, compressive, torsional or leg spring, which supports the pivotal movement of the flap 2 in the direction of the closed position.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Control Of Combustion (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Temperature-Responsive Valves (AREA)
  • Air-Flow Control Members (AREA)

Description

Die Erfindung betrifft eine Rückbrennsicherung für einen Luftansaugkanal einer Verbrennungsheizung.The invention relates to a back burner fuse for an air intake duct of a combustion heater.

Eine derartige Verbrennungsheizung, wie sie beispielsweise in der DE 191 85 67 U für einen Caravan gezeigt ist, saugt die nötige Verbrennungsluft über einen Luftansaugkanal aus der Umgebung des Caravans an. Dadurch wird sichergestellt, dass die Heizung ihre Verbrennungsluft nicht aus dem Innenraum des Caravans bezieht, was eine Gefährdung der Insassen des Caravans bedeuten könnte. Der Luftansaugkanal schließt an eine Seiten- oder Bodenwand des Caravangehäuses an. Durch die Flamme in der Heizung und die über ihr in einem Kamin aufsteigenden heißen Verbrennungsgase entsteht eine Strömung, die Frischluft von außen über den Luftansaugkanal in die Heizung fördert.Such a combustion heater, as shown for example in DE 191 85 67 U for a caravan, sucks the necessary combustion air via an air intake duct from the vicinity of the caravan. This ensures that the heater does not draw its combustion air from the interior of the caravan, which could endanger the occupants of the caravan. The air intake duct connects to a side or bottom wall of the caravan housing. Due to the flame in the heater and the rising above her in a fireplace hot combustion gases creates a flow that promotes fresh air from the outside via the air intake into the heater.

Unter bestimmten, meist durch den Benutzer der Heizung verursachten Gegebenheiten oder bei außergewöhnlichen Windverhältnissen am Caravan besteht die Gefahr, dass sich die Luftströmung umkehrt und Frischluft über den meist am Dach des Caravans auslaufenden Kamin zur Heizung gefördert wird. Die Flamme der Heizung schlägt dann in den normalerweise zur Frischluftförderung dienenden Luftansaugkanal. Auch wenn dieser aus nichtbrennbaren Materialien hergestellt ist, ist er der Hitzeeinwirkung durch eine über längere Zeit in ihn schlagende Flamme und die daraus resultierenden Rauchgase nicht gewachsen. Ein Durchbrennen der Kanalwände oder der Dichtungsstellen ist die Folge, was letztendlich zu einer massiven Gefährdung des Wohnwagens oder seiner Insassen führen kann.Under certain circumstances, usually caused by the user of the heating or in exceptional wind conditions on the caravan, there is a risk that the air flow is reversed and fresh air is conveyed to the heater via the fireplace, which usually runs out on the roof of the caravan. The flame of the heating then beats in the normally used for fresh air promotion air intake duct. Although this is made of non-combustible materials, it is not able to cope with the effects of heat due to a flame which strikes it for a long time and the resulting flue gases. Burning through the channel walls or the sealing points is the result, which can ultimately lead to a massive threat to the caravan or its occupants.

Aus der US-A-5,402,603 ist eine Rückbrennsicherung zum Schutz vor einer Verpuffungsflamme bekannt. Die Rückbrennsicherung weist eine Klappe auf, die sich in Offenstellung gegen eine vorgespannte Feder abstützt. Die Feder wird durch ein Sicherungselement in der Vorspannungsstellung gehalten, wobei das Sicherungselement aus einem schmelzbaren Material besteht. Bei Durchschmelzen des Sicherungselements wird die Feder freigegeben und schließt die Klappe.From US-A-5,402,603 a burn back fuse for protection from a deflagration flame is known. The back burner has a flap which is supported in the open position against a prestressed spring. The spring is held by a securing element in the biasing position, wherein the securing element consists of a fusible material. When the fuse element melts, the spring is released and closes the flap.

Eine ähnliche Anordnung ist aus der US-A-3,172,347 bekannt. Bei der dort gezeigten Rückbrennsicherung wird eine Klappe durch ein Verbindungselement in Offenstellung gehalten, wobei das Verbindungselement einen vordefinierten Schmelzpunkt hat. Bei Durchschmelzen des Sicherungselements fällt die Klappe durch ihr Eigengewicht zu und verschließt einen Luftkanal.A similar arrangement is known from US-A-3,172,347. In the backfire fuse shown there, a flap is held by a connecting element in the open position, wherein the connecting element has a predefined melting point. When melting the fuse element, the flap falls through her Dead weight and closes an air duct.

Der Erfindung liegt die Aufgabe zugrunde, eine Rückbrennsicherung für einen Luftansaugkanal anzugeben, die zuverlässig eine Schädigung des Luftansaugkanals aufgrund einer in den Luftansaugkanal rückschlagenden Flamme einer Verbrennungsheizung verhindert.The invention has for its object to provide a backup fuse for an air intake duct, which reliably prevents damage to the air intake duct due to a flashback in the air intake duct flame combustion heating.

Erfindungsgemäß wird die Aufgabe durch eine Rückbrennsicherung mit den Merkmalen von Patentanspruch 1 gelöst. Vorteilhafte Weiterentwicklungen der Erfindung sind den abhängigen Ansprüchen zu entnehmen.According to the invention the object is achieved by a back burner with the features of claim 1. Advantageous developments of the invention can be found in the dependent claims.

Danach weist die erfindungsgemäße Rückbrennsicherung eine in dem Luftansaugkanal angeordnete, um eine Achse verschwenkbare Klappe auf, die durch ein Sicherungselement in einer die Luftströmung im Luftansaugkanal nicht behindernden Offenstellung gehalten wird. Das Sicherungselement verbindet dabei die Klappe mit einer Außenwand des Luftansaugkanals. Bei Überschreiten eines vorbestimmten Temperaturgrenzwerts nimmt die Festigkeit des Sicherungselements derart ab, dass es seine Haltefunktion nicht mehr ausüben kann. Ein Lösen der Halteverbindung ist die Folge, sodass die Klappe frei drehbar wird und sich selbsttätig in eine die Luftströmung verhindernde Schließstellung verschwenkt. Dadurch wird die Luftströmung derart unterbrochen, dass die Flamme in der Heizung - unabhängig von der aktuellen Luftströmungs- und damit Flammkegelrichtung - sofort erlischt. Eine weitere Gefährdung wird somit ausgeschlossen. Die Klappe kann erst im Rahmen einer eingehenden Untersuchung - vorzugsweise durch Fachpersonal - wieder rückgestellt und in der Offenstellung mittels der durch ein neues Sicherungselement bewirkten Halteverbindung fixiert werden. Bei dieser Gelegenheit kann die Ursache für den Rückschlag der Flamme untersucht und z. B. durch bauliche Veränderungen behoben werden.Thereafter, the back burner according to the invention has a arranged in the air intake duct, pivotable about an axis flap, which is held by a securing element in a non-obstructing air flow in the air intake duct open position. The fuse element connects the flap with an outer wall of the air intake duct. When a predetermined temperature limit value is exceeded, the strength of the securing element decreases such that it can no longer exercise its holding function. A release of the holding connection is the result, so that the flap is freely rotatable and pivots automatically in a closed air flow preventing the closed position. As a result, the air flow is interrupted so that the flame in the heater - regardless of the current Luftströmungs- and thus flame cone direction - immediately goes out. Another danger is thus excluded. The flap can be reset only in the context of a detailed examination - preferably by specialist personnel - and fixed in the open position by means of the effect brought about by a new securing element holding connection. On this occasion, the cause of the flashback of the flame can be investigated and z. B. be remedied by structural changes.

Gemäß einer besonders vorteilhaften Weiterentwicklung der Erfindung weist die Klappe eine bezüglich ihrer Schwenkachse unsymmetrische Gewichtsverteilung auf, die die Klappe in Schließstellung zwingt. Aufgrund der unsymmetrischen Gewichtsverteilung, die z. B. auch durch ein Zusatzgewicht auf der Platte erreicht werden kann, ist es möglich, dass die Klappe allein aufgrund der Schwerkraftwirkung bei Lösen der Halteverbindung automatisch in die Schließstellung verschwenkt, ohne dass weitere Hilfsmittel wie Federn erforderlich sind.According to a particularly advantageous further development of the invention, the flap has an asymmetrical weight distribution with respect to its pivot axis, which forces the flap into the closed position. Due to the asymmetrical weight distribution, the z. B. can also be achieved by an additional weight on the plate, it is possible that the flap automatically pivoted alone due to the force of gravity when releasing the holding connection in the closed position, without further aids such as springs are required.

Die Klappe mit ihrer Achse lässt sich dabei besonders einfach montieren, wenn gemäß einer anderen vorteilhaften Weiterentwicklung Öffnungen in der Außenwand des Luftansaugkanals vorgesehen sind, die von außen zugänglich sind, sodass von dort die Achse in den Luftansaugkanal eingeschoben werden kann. Die Achse lässt sich dann über ein Rohr, das Bestandteil des Luftansaugkanals sein kann, axial sichern.The flap with its axis can be particularly easy to assemble, if openings are provided in the outer wall of the air intake duct according to another advantageous development, which are accessible from the outside, so that from there the axis can be inserted into the air intake duct. The axle can then be secured axially via a pipe, which may be part of the air intake duct.

Die Festigkeit des Sicherungselements in Abhängigkeit von der Temperatur ist vorteilhafterweise derart gewählt, dass das Sicherungselement bei Erreichen des Temperaturgrenzwerts entweder schmilzt oder so weich wird, dass es die Klappe nicht mehr an der Außenwand halten kann.The strength of the securing element as a function of the temperature is advantageously selected such that the securing element when it reaches the temperature limit value either melts or becomes so soft that it can no longer hold the flap against the outside wall.

Diese und weitere Vorteile und Merkmale der Erfindung werden nachfolgend anhand eines Beispiels unter Zuhilfenahme der begleitenden Figuren näher erläutert. Es zeigen:

Fig. 1
einen Teil eines Luftansaugkanals in Schnittdarstellung mit der erfindungsgemäßen Rückbrennsicherung in Offen- und Schließstellung;
Fig. 2
eine vergrößerte Perspektivansicht einer Aufnahme eines Sicherungselements, gesehen in Pfeilrichtung A von Fig. 1;
Fig. 3
eine vergrößerte Draufsicht auf die Aufnahme von Fig. 2;
Fig. 4
eine vergrößerte Perspektivansicht des Sicherungselements; und
Fig. 5
eine vergrößerte Seitenteilansicht des Sicherungselements.
These and other advantages and features of the invention are explained in more detail below by way of example with the aid of the accompanying figures. Show it:
Fig. 1
a portion of an air intake duct in a sectional view with the back burner fuse according to the invention in open and closed position;
Fig. 2
an enlarged perspective view of a receptacle of a securing element, as seen in the direction of arrow A of Fig. 1;
Fig. 3
an enlarged plan view of the receptacle of Fig. 2;
Fig. 4
an enlarged perspective view of the fuse element; and
Fig. 5
an enlarged partial side view of the fuse element.

Fig. 1 zeigt einen Teilbereich eines Luftansaugkanals 1 für eine Verbrennungsheizung, wobei eine Klappe 2 in Offenstellung und - strichpunktiert - in Schließstellung abgebildet ist.Fig. 1 shows a portion of an air intake duct 1 for a combustion heater, wherein a flap 2 in the open position and - dash-dotted lines - is shown in the closed position.

Der gezeigte Teilbereich des Luftansaugkanals 1 besteht aus einem Bodenanschlussstutzen 3 und einem aufgeschobenen flexiblen Rohr 4 mit im Wesentlichen kreisförmigem Querschnitt. Das Rohr 4 wird in Richtung eines Pfeils 5 zu einer nicht dargestellten atmosphärischen Gasheizung geführt, die die angesaugte Luft verbraucht. Der Bodenanschlussstutzen 3 wird in den Boden eines Caravans eingeschraubt, sodass Luft in Richtung eines Pfeils 6 in den Luftansaugkanal 1 gelangen kann.The shown portion of the air intake duct 1 consists of a bottom connecting piece 3 and a deferred flexible tube 4 with a substantially circular cross-section. The tube 4 is guided in the direction of an arrow 5 to an atmospheric gas heater, not shown, which consumes the sucked air. The bottom connection piece 3 is screwed into the bottom of a caravan, so that air in the direction of an arrow 6 can get into the air intake duct 1.

Quer durch den Bodenanschlussstutzen 3, d. h. in der Fig. 1 senkrecht zur Zeichenebene, ist ein als Achse 7 dienender Drahtstift durch nicht dargestellte Öffnungen in einer Außenwand 8 des Bodenanschlussstutzens 3 eingeschoben. Ein Herausrutschen der Achse 7 aus den Öffnungen der Außenwand 8 wird dadurch vermieden, dass das Rohr 4 über die Öffnungen übergeschoben ist. Das Rohr 4 dient somit auch zur Axialfixierung der Achse 7. Weitere Bauteile sind dafür nicht erforderlich.Transversely through the bottom connection piece 3, ie in Fig. 1 perpendicular to the plane, serving as an axis 7 wire pin is inserted through openings not shown in an outer wall 8 of the bottom connection piece 3. Slipping out of the axis 7 from the openings of the outer wall 8 is avoided in that the tube 4 is pushed over the openings. The tube 4 thus also serves to Axialfixierung the axis 7. Other components are not required.

Die Klappe 2 wird von der Achse 7 schwenkbar gehalten. Je nach Ausführungsform dreht sich die Achse 7 mit der Klappe 2 oder steht fest, während nur die Klappe 2 auf der Achse 7 verschwenkbar ist.The flap 2 is pivotally supported by the axis 7. Depending on the embodiment, the axis 7 rotates with the flap 2 or is fixed, while only the flap 2 on the axis 7 is pivotable.

Die Klappe 2 ist wenigstens zwischen der in Fig. 1 mit durchgezogenem Strich dargestellten Offenstellung und der als strichpunktierte Linie dargestellten Schließstellung verschwenkbar.The flap 2 is pivotable at least between the open position shown in FIG. 1 by a solid line and the closed position shown as a dotted line.

Die Schließstellung wird durch einen Anschlag 9 sichergestellt, während die Offenstellung durch ein Sicherungselement 10 gehalten wird. Es ist erkennbar, dass die Klappe 2 in ihrer Offenstellung die Luftströmung im Luftansaugkanal 1 im Wesentlichen nicht behindert, während sie in ihrer Schließstellung eine Luftströmung weitgehend unterbindet.The closed position is ensured by a stop 9, while the open position is held by a securing element 10. It can be seen that, in its open position, the flap 2 does not substantially hinder the air flow in the air intake duct 1, while in its closed position it substantially prevents air flow.

Das Sicherungselement 10 besteht aus einem Material mit niedrigem Schmelzpunkt, vorzugsweise einem Kunststoffmaterial, und ist einstückig hergestellt. Mit einem Anker 11 ist das Sicherungselement 10 in eine in Fig. 2 in perspektivischer Großdarstellung halbseitig gezeigten Ausnehmung 12 eingesetzt. Die in der Außenwand 8 ausgebildete Ausnehmung 12 ist am stirnseitigen Ende des Bodenanschlussstutzens 3 offen, sodass der im Wesentlichen plattenförmige Anker 11 in Achsrichtung des Bodenanschlussstutzens 3 gegen einen sich hinter der Ausnehmung 12 befindlichen Dichtring 13 aufgeschoben werden kann. Dieser Zustand ist auch in dem Zusammenbau gemäß Fig. 3 erkennbar.The securing element 10 is made of a material with a low melting point, preferably a plastic material, and is manufactured in one piece. With an armature 11, the securing element 10 is inserted into a half-side recess 12 shown in FIG. 2 in a perspective large-scale representation. The formed in the outer wall 8 recess 12 is open at the front end of the bottom connecting piece 3, so that the substantially plate-shaped armature 11 can be pushed in the axial direction of the bottom connecting piece 3 against a located behind the recess 12 sealing ring 13. This condition can also be seen in the assembly according to FIG. 3.

Rechtwinklig von dem Anker 11 erstreckt sich ein Steg 14, der in einem gabelförmigen Teil 15 mündet, wie aus Fig. 4 ersichtlich, die das Sicherungselement 10 in Alleinstellung zeigt.At right angles to the armature 11 extends a web 14, which opens into a fork-shaped part 15, as shown in FIG. 4, which shows the securing element 10 in isolation.

Das gabelförmige Teil 15 ist in Fig. 5 vergrößert dargestellt.The fork-shaped part 15 is shown enlarged in Fig. 5.

Ein Zinken des gabelförmigen Teils 15 weist einen Haken 16 auf, der beim Aufschieben des Sicherungselements 10 auf die Klappe 2 in der in Fig. 1 gezeigten Offenstellung in eine Ausnehmung 17 in der aus einem dünnen Edelstahlblech bestehende Klappe 2 eingreift. Ein dem Haken 16 gegenüberliegender Zinken 18 des gabelförmigen Teils 15 federt zusätzlich dagegen, wodurch die Klappe 2 zuverlässig am gabelförmigen Teil 15 gehalten wird. Das Sicherungselement 10 bildet somit eine Halteverbindung zwischen der Klappe 2 und der Außenwand 8, die die Klappe 8 sicher in Offenstellung hält.A prong of the fork-shaped part 15 has a hook 16, which engages when sliding the securing element 10 on the flap 2 in the open position shown in Fig. 1 in a recess 17 in the existing of a thin stainless steel sheet flap 2. An opposite of the hook 16 tines 18 of the fork-shaped part 15 additionally springs against it, whereby the flap 2 is reliably held on the fork-shaped part 15. The securing element 10 thus forms a retaining connection between the flap 2 and the outer wall 8, which securely holds the flap 8 in the open position.

Wie bereits gesagt, besteht das Sicherungselement 10 aus einem Material mit niedrigem Schmelzpunkt bzw. einer unter Wärmeeinwirkung stark abnehmenden Festigkeit. Das Material muss dabei derart ausgewählt sein, dass es bei Erreichen eines vorbestimmten Temperaturgrenzwerts eine derart niedrige Festigkeit aufweist, dass die Halteverbindung zwischen der Außenwand 8 und der Klappe 2 gelöst wird. Dies ist z. B. dadurch möglich, dass das Sicherungselement 10 an seinem Steg 14 aufschmilzt. Alternativ ist es auch möglich, dass das gabelförmige Teil 15 so weich wird, dass die Klappe 2 mit ihrer Ausnehmung 17 aus der Klemmung zwischen dem Haken 16 und dem Zinken 18 herausrutschen kann. In jedem Fall sollte das Material des Sicherungselements 10 dasjenige sein, das den niedrigsten Schmelzpunkt aller im Luftansaugkanal 1 verwendeten Materialien aufweist.As already stated, the securing element 10 is made of a material with a low melting point or a strong decreasing strength under heat strength. In this case, the material must be selected such that, when a predetermined temperature limit value is reached, it has such a low strength that the holding connection between the outer wall 8 and the flap 2 is released. This is z. B. possible because the fuse element 10 melts at its web 14. Alternatively, it is also possible that the fork-shaped part 15 is so soft that the flap 2 with its recess 17 from the clamping between the hook 16 and the prongs 18 can slip out. In any case, the material of the securing element 10 should be that which has the lowest melting point of all materials used in the air intake duct 1.

Wenn aufgrund einer Luftströmungsumkehr die Flamme der Heizung umschlägt und sich in den Luftansaugkanal 1 erstreckt, erwärmen die heißen Verbrennungsgase der Flamme den Luftansaugkanal schnell. Da das Sicherungselement 10 die niedrigste Wärmefestigkeit aller im Abgasweg befindlichen Teile aufweist, verliert es als erstes seine Festigkeit, wodurch die Halteverbindung gelöst wird. Die Klappe 2 wird frei beweglich und kann in die Schließstellung gelangen und den Luftansaugkanal schließen.When, due to an air flow reversal, the flame of the heater turns over and extends into the air intake passage 1, the hot combustion gases of the flame rapidly heat the air intake passage. Since the fuse element 10 has the lowest heat resistance of all parts located in the exhaust path, it first loses its strength, whereby the retaining connection is released. The flap 2 is free to move and can reach the closed position and close the air intake.

Um die gewünschte Verschwenkung der Klappe 2 zu erhalten, ist es zweckmäßig, das Gewicht der Klappe 2 unsymmetrisch um die Achse 7 zu verteilen. Zur Unterstützung kann auch noch ein zusätzliches Gewicht 19 auf der Klappe 2 angebracht werden. Die unsymmetrische Gewichtsverteilung ist so zu wählen, dass die Klappe 2 allein aufgrund der Schwerkraftwirkung in Schließstellung gehalten wird. Dadurch nimmt sie stets unmittelbar die Schließstellung ein, wenn die Halteverbindung zur Außenwand 8 gelöst ist.In order to obtain the desired pivoting of the flap 2, it is expedient to distribute the weight of the flap 2 asymmetrically about the axis 7. To support an additional weight 19 can also be attached to the flap 2. The unbalanced weight distribution should be chosen so that the flap 2 is held in the closed position solely due to the gravitational effect. As a result, it always assumes the closed position immediately when the holding connection to the outer wall 8 is released.

Anstelle oder in Ergänzung der unsymmetrischen Gewichtsverteilung auf der Klappe 2 ist es auch möglich, eine Federeinrichtung, z. B. eine Zug-, Druck-, Torsions- oder Schenkelfeder einzusetzen, die die Schwenkbewegung der Klappe 2 in Richtung Schließstellung unterstützt.Instead of or in addition to the asymmetrical weight distribution on the flap 2, it is also possible to use a spring device, for. B. to use a tensile, compressive, torsional or leg spring, which supports the pivotal movement of the flap 2 in the direction of the closed position.

Wenn die Klappe 2 aufgrund einer rückschlagenden Flamme in Schließstellung verschwenkt wurde und die Flamme erloschen ist, ist das Sicherungselement 10 soweit zerstört, dass es ausgetauscht werden muss. Außerdem muss die Klappe 2 wieder in der Offenstellung durch das Sicherungselement 10 fixiert werden. Diese Aufgabe sollte zweckmäßigerweise von einem Fachmann durchgeführt werden, der gleichzeitig dem Grund für die rückschlagende Flamme nachgehen kann. Um es aber dem Bediener zu ermöglichen, den Grund für einen Ausfall seiner Heizung in Erfahrung zu bringen, ist es zweckmäßig, wenn die Stellung der Klappe 2 mittels einer nicht dargestellten Anzeigeeinrichtung auch außerhalb des Luftansaugkanals 1 erkennbar ist. Zu diesem Zweck könnte z. B. ein an der Außenseite befindlicher Zeiger mit der Achse 7 verbunden sein, die wiederum fest mit der Klappe 2 gekoppelt ist. Selbstverständlich sind auch andere Möglichkeiten zur Erfassung der Stellung der Klappe 2 im Inneren des Luftansaugkanals 1, wie z. B. induktive Aufnehmer etc., denkbar.If the flap 2 has been pivoted in the closed position due to a flashback flame and the flame is extinguished, the fuse element 10 is destroyed so far that it must be replaced. In addition, the must Flap 2 are fixed again in the open position by the securing element 10. This task should be carried out expediently by a person skilled in the art who can simultaneously investigate the reason for the flashback flame. However, in order to allow the operator to know the reason for failure of his heater, it is useful if the position of the flap 2 by means of a display device, not shown, also outside the air intake duct 1 can be seen. For this purpose, z. B. a pointer located on the outside to be connected to the axis 7, which in turn is fixedly coupled to the flap 2. Of course, other possibilities for detecting the position of the flap 2 in the interior of the air intake duct 1, such. B. inductive pickups, etc., conceivable.

Claims (10)

  1. Flashback protection apparatus for an air-intake duct (1) of a combustion heater, with
    - a damper (2) whose profile essentially matches the cross-section of the air-intake duct (1) in shape;
    - a pivot (7) extending at an angle to an airflow device (5, 6) and round which the damper (2) can be pivoted; and with
    - a securing element (10) fixed to an outer wall (8) of the air-intake duct (1) and whose firmness declines under exposure to heat;
    where
    - between the damper (2) and the outer wall (8) the securing element (10) forms a holding joint by which the damper (2) is held in an open position which essentially does not impede airflow in the air-intake duct;
    - the decline in firmness of the securing element (10) under exposure to heat is gauged so that the holding joint between the outer wall (8) and damper (2) is released when a predefined temperature has been reached in the vicinity of the securing element (10); and where
    - after release of the holding joint the damper (2) can be swung into a closed position which essentially stops the airflow,
    characterised in that the securing element (10) has a bifurcated end (15) in which the damper (2) may be clamped.
  2. Flashback protection apparatus according to Claim 1, characterised in that the damper (2) has an asymmetrical weight distribution relative to the pivot (7) which forces the damper (2) into the closed position.
  3. Flashback protection apparatus according to Claim 1 or 2, characterised in that the damper (2) is acted on by a spring device which forces the damper (2) into the closed position.
  4. Flashback protection apparatus according to one of Claims 1 to 3, characterised in that on the outer wall (8) of the air-intake duct (1) a limit stop (9) is provided which positions the damper (2) in the closed position.
  5. Flashback protection apparatus according to one of Claims 1 to 4, characterised in that the pivot (7) is mounted in holes in the outer wall (8) of the air-intake duct (1).
  6. Flashback protection apparatus according to Claim 5, characterised in that the pivot (7) can be inserted into the holes from the outside of the outer wall (8) and a axially secured by a tube (4) which can be pushed over the outside, covering the holes.
  7. Flashback protection apparatus according to one of Claims 1 to 6, characterised in that the securing element (10) is detachably mounted in the outer wall (8).
  8. Flashback protection apparatus according to one of Claims 1 to 7, characterised in that parts (16, 18) of the bifurcated end (15) bend open when the temperature limit is reached.
  9. Flashback protection apparatus according to one of Claims 1 to 8, characterised in that the securing element (10) melts when the temperature limit is reached.
  10. Flashback protection apparatus according to one of Claims 1 to 9, characterised in that an indicating device is provided by which the position of the damper (2) is detectable from outside the air-intake duct (1).
EP20010107963 2000-05-18 2001-03-28 Protection against flashback Expired - Lifetime EP1156277B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000124511 DE10024511C1 (en) 2000-05-18 2000-05-18 Flashback protection
DE10024511 2000-05-18

Publications (3)

Publication Number Publication Date
EP1156277A2 EP1156277A2 (en) 2001-11-21
EP1156277A3 EP1156277A3 (en) 2002-11-06
EP1156277B1 true EP1156277B1 (en) 2006-06-14

Family

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Application Number Title Priority Date Filing Date
EP20010107963 Expired - Lifetime EP1156277B1 (en) 2000-05-18 2001-03-28 Protection against flashback

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EP (1) EP1156277B1 (en)
DE (1) DE10024511C1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD905217S1 (en) 2018-09-05 2020-12-15 Dometic Sweden Ab Air conditioning apparatus
USD907183S1 (en) 2016-11-23 2021-01-05 Dometic Sweden Ab Air conditioning apparatus
US11772452B2 (en) 2017-11-16 2023-10-03 Dometic Sweden Ab Air conditioning apparatus for recreational vehicles
US12043081B2 (en) 2019-10-17 2024-07-23 Dometic Sweden Ab Air conditioning apparatus for recreational vehicles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2354653B1 (en) 2010-01-13 2014-11-26 Truma Gerätetechnik GmbH & Co. KG Flashback prevention for a gas heater

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US3172347A (en) * 1962-11-13 1965-03-09 American Warming Ventilation Universal fire damper with angular axle
DE1918567U (en) 1965-02-22 1965-06-24 Heinz Meyer VENTILATION FOR A CARAVAN HEATED WITH AN OVEN.
US3449793A (en) * 1967-04-21 1969-06-17 Intern Rubber Ind Inc Machine for working rubber and like plastics
US4174942A (en) * 1977-07-25 1979-11-20 Mcarthur Donald A Flue control assembly
AT391931B (en) * 1988-10-12 1990-12-27 Hofer Josef Fa FIRE CLOSURE CUFF
US5090445A (en) * 1991-02-19 1992-02-25 Jackson Bert W Air actuated damper
US5402603A (en) * 1992-01-03 1995-04-04 Henley; Robert L. Flapper plate detonation flame arrester

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD907183S1 (en) 2016-11-23 2021-01-05 Dometic Sweden Ab Air conditioning apparatus
US11772452B2 (en) 2017-11-16 2023-10-03 Dometic Sweden Ab Air conditioning apparatus for recreational vehicles
USD905217S1 (en) 2018-09-05 2020-12-15 Dometic Sweden Ab Air conditioning apparatus
USD944374S1 (en) 2018-09-05 2022-02-22 Dometic Sweden Ab Air conditioning apparatus
US12043081B2 (en) 2019-10-17 2024-07-23 Dometic Sweden Ab Air conditioning apparatus for recreational vehicles

Also Published As

Publication number Publication date
EP1156277A3 (en) 2002-11-06
DE10024511C1 (en) 2002-01-31
EP1156277A2 (en) 2001-11-21

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