EP0856705A1 - Arrangement of heat exchanger - Google Patents

Arrangement of heat exchanger Download PDF

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Publication number
EP0856705A1
EP0856705A1 EP97120541A EP97120541A EP0856705A1 EP 0856705 A1 EP0856705 A1 EP 0856705A1 EP 97120541 A EP97120541 A EP 97120541A EP 97120541 A EP97120541 A EP 97120541A EP 0856705 A1 EP0856705 A1 EP 0856705A1
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EP
European Patent Office
Prior art keywords
heat exchanger
bend
exchanger tube
tube
cantilevered
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.)
Granted
Application number
EP97120541A
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German (de)
French (fr)
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EP0856705B1 (en
Inventor
Peter Wiedemann
Franz Koch
Gerd Gumienny
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.)
Rational AG
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Rational AG
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Filing date
Publication date
Priority claimed from DE19708231A external-priority patent/DE19708231C2/en
Application filed by Rational AG filed Critical Rational AG
Publication of EP0856705A1 publication Critical patent/EP0856705A1/en
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Publication of EP0856705B1 publication Critical patent/EP0856705B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/327—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation with air moisturising

Definitions

  • the invention relates to a heat exchanger device a fan wheel, in particular a radial fan wheel, a Burner and at least one associated with the burner Heat exchanger tube which surrounds the fan wheel.
  • Such a heat exchanger device is known from EP 0 526 768 B1 known; it is used to cook food in a cooking chamber of a corresponding device.
  • the heat exchanger tube preferably has in the region of the cantilever Bend an enlarged cross section. Because of the reversal of the flow direction results in Area of the bend increased due to a vortex formation Flow resistance, which by the invention Cross-sectional expansion is compensated. Ideally is this expanded cross section dimensioned so that the Flow resistance in the area of the bend essentially is the same as in the two pipe sections to which the Guide the bend towards or away from it. With that the Avoid danger of local overheating.
  • An enlarged cross section in the cantilever area Bend can be achieved in particular that the two pipe sections, which are the cantilevered bend form, meet at an acute angle.
  • the heat exchanger tube advantageously has Cantilever bend an oval Cross-section.
  • the cantilevered bend can preferably be caused by a change in direction be formed by 180 ° in the heat exchanger tube.
  • the cantilevered bend horizontal or vertical end creates that first with a sufficient distance to other system components can be provided so that thermal expansion without problems can be included or compensated.
  • the cantilevered bend is more preferably removed from Fastening points of the heat exchanger tube on a housing wall or the like provided.
  • the heat exchanger tube around the fan wheel along the outline a rectangular surface.
  • the heat exchanger tube surrounds the fan in the form of a square or rectangle, the pipe curvatures in the respective Corners of this rectangle.
  • this arrangement is the usual cuboid Geometries of rooms for the heat treatment of food advantageous because in this way an optimal use of space is achieved.
  • the heat exchanger tube following the bend parallel to the Mr. Touch can be returned, so that a compact and simple arrangement of the heat exchanger tube can be made can.
  • the invention makes it possible without expensive corrugated pipes get along and in particular heat exchanger tubes use that are at least smooth on the outside. This enables hygienic, advantageous cleaning.
  • the tube can be made sufficiently solid be so that the risk of mechanical damage is low is and the lifespan and operational safety are guaranteed.
  • a heat exchanger device is preferred, as before described in a device for heat treatment of Food used, the heat exchanger device in Cooking space of the device can be arranged without adverse influences on the food to be cooked would be feared.
  • the simple cleaning options represent a particular advantage of the heat exchanger device for the intended use.
  • FIGS. 1 and 2 In the heat exchanger devices shown in FIGS. 1 and 2 are all surrounding components, such as Housing parts, fastening parts, connections and the like omitted.
  • a heat exchanger tube 14 placed such that it is initially based on a combustion chamber 12 in the there is a burner or on which a burner acts, essentially along a square outline is guided, being in the corner areas of the imagined Squares the curvature of the pipe according to the material specification is laid.
  • the heat exchanger tube 14 After the heat exchanger tube 14 almost one complete circulation around the fan 10 is formed it returned with a change of direction of 180 °, forming a cantilevered bend 16 which according to the drawing, down depends and one sufficient to absorb the thermal expansion Distance from other system components.
  • the heat exchanger tube 14 is then on the outline of the same square returned and ends in a not shown Connection. As long as the attachment points are sufficient are removed from the cantilevered bend 16, these are relieved of the thermal stresses that for the most part of the cantilevered bend 16 or the one formed thereby End section are included.
  • the two pipe sections 16a and 16b meet at an acute angle in the region of the cantilevered bend 16.
  • the heat exchanger tube has an essentially circular cross section with a diameter D 1 .
  • the tube has an essentially elliptical cross section, the small axis of the ellipse having the length D 1 and the large axis of the ellipse having the length D 2 .
  • D 2 is about 1.2 to 1.4 times D2, for example 1.3 times.
  • the cross-sectional area of the heat exchanger tube 14 in the region of the bend 16 is approximately 20% to 40% larger than in the other regions of the tube 14.
  • an enlarged tube cross section in the other bent regions of the heat exchanger tube, in particular in the Edge areas can be provided with a deflection of substantially 90 °.

Abstract

The exchanger has a radial fan (10) which is surrounded by a burner (12). It also has a pipe (14) which is formed in at least one section to a freely cantilevered bend (16). Preferably the bend has an enlarged cross-section and the pipe sections which form the bend meet at an acute angle, the bend including a change of direction of 180 degrees . The preferred cross-section of the pipe in the region of the bend is an oval shape.

Description

Die Erfindung betrifft eine Wärmetauschereinrichtung mit einem Lüfterrad, insbesondere einem Radial-Lüfterrad, einem Brenner und zumindest einem dem Brenner zugeordneten Wärmetauscherrohr, welches das Lüfterrad umgibt.The invention relates to a heat exchanger device a fan wheel, in particular a radial fan wheel, a Burner and at least one associated with the burner Heat exchanger tube which surrounds the fan wheel.

Eine solche Wärmetauschereinrichtung ist aus der EP 0 526 768 B1 bekannt; sie wird zum Garen von Nahrungsmitteln in einem Garraum einer entsprechenden Vorrichtung eingesetzt. Such a heat exchanger device is known from EP 0 526 768 B1 known; it is used to cook food in a cooking chamber of a corresponding device.

Ein Problem bei gasbeheizten Wärmetauschern ist, daß durch die hohen Temperaturen Spannungen entstehen, die einerseits von den Rohren aufgenommen werden müssen, die andererseits das Rohr aber insbesondere an den Befestigungsstellen am Gehäuse, an einem Rahmen oder dergleichen belasten. Gleichzeitig ist einhoher Wirkungsgrad des Wärmeaustausches anzustreben. Die EP 0 526 768 B1 schlägt dazu vor, das Wärmetauscherrohr spiralförmig um das Lüfterrad zu führen, wodurch eine gleichmäßigere Wärmeausdehnung des Wärmetauscherrohres mit gleichzeitig optimiertem Wärmeaustausch erfolgen soll.A problem with gas heated heat exchangers is that the high temperatures create tensions on the one hand must be taken up by the pipes, on the other hand the pipe but especially at the attachment points on the housing, on a frame or the like strain. At the same time, heat exchange is highly efficient to strive for. EP 0 526 768 B1 suggests To do this, spiral the heat exchanger tube around the fan wheel lead, creating a more uniform thermal expansion of the heat exchanger tube with optimized at the same time Heat exchange should take place.

Es bleibt das Problem, daß weiterhin die Befestigungsstellen des Wärmetauscherrohres an der Gehäusewand oder dergleichen belastet werden. Dieses Problem zu lösen, hat sich die Erfindung zur Aufgabe gestellt.The problem remains that the attachment points continue of the heat exchanger tube on the housing wall or the like be charged. To solve this problem has set itself the task.

Dazu ist gemäß der Erfindung vorgesehen, daß bei der Wärmetauschereinrichtung der eingangs genannten Gattung das Wärmetauscherrohr in zumindest einem Abschnitt zu einer freikragenden Biegung gekrümmt ist. Diese freikragende Riegung nimmt die Wärmedehnungen auf, so daß die Befestigungsstellen des Wärmetauscherrohres weitgehend entlastet werden.For this purpose, it is provided according to the invention that in the heat exchanger device of the genus mentioned above Heat exchanger tube in at least one section to one cantilevered bend is curved. This cantilevered Riegung absorbs the thermal expansion, so that the fastening points the heat exchanger tube largely relieved will.

Bevorzugt weist das Wärmetauscherrohr im Bereich der freikragenden Biegung einen vergrößerten Querschnitt auf. Wegen der Umkehr der Strömungsrichtung ergibt sich im Bereich der Biegung aufgrund einer Wirbelbildung ein erhöhter Strömungswiderstand, der erfindungsgemäß durch die Querschnittserweiterung ausgeglichen wird. Idealerweise ist dieser erweiterte Querschnitt so bemessen, daß der Strömungswiderstand im Bereich der Biegung im wesentlichen derselbe wie in den beiden Rohrabschnitten ist, die zu der Biegung hin- bzw. von dieser wegführen. Damit wird die Gefahr einer lokalen Überhitzung vermieden.The heat exchanger tube preferably has in the region of the cantilever Bend an enlarged cross section. Because of the reversal of the flow direction results in Area of the bend increased due to a vortex formation Flow resistance, which by the invention Cross-sectional expansion is compensated. Ideally is this expanded cross section dimensioned so that the Flow resistance in the area of the bend essentially is the same as in the two pipe sections to which the Guide the bend towards or away from it. With that the Avoid danger of local overheating.

Ein vergrößerter Querschnitt im Bereich der freikragenden Biegung kann insbesondere dadurch erreicht werden, daß die beiden Rohrabschnitte, welche die freikragende Biegung bilden, in einem spitzen Winkel aufeinandertreffen.An enlarged cross section in the cantilever area Bend can be achieved in particular that the two pipe sections, which are the cantilevered bend form, meet at an acute angle.

Vorteilhafterweise besitzt das Wärmetauscherrohr im Bereich der freikragenden Biegung einen ovalen Querschnitt.The heat exchanger tube advantageously has Cantilever bend an oval Cross-section.

Bevorzugt kann die freikragende Biegung durch eine Richtungsänderung im Wärmetauscherrohr um 180° gebildet sein. Beispielsweise wird durch die freikragende Biegung ein horizontales oder vertikales Ende erzeugt, das zunächst mit hinreichendem Abstand zu anderen Systemkomponenten vorgesehen sein kann, so daß Wärmedehnungen ohne Probleme aufgenommen bzw. ausgeglichen werden können.The cantilevered bend can preferably be caused by a change in direction be formed by 180 ° in the heat exchanger tube. For example, the cantilevered bend horizontal or vertical end creates that first with a sufficient distance to other system components can be provided so that thermal expansion without problems can be included or compensated.

Weiter bevorzugt ist die freikragende Biegung entfernt von Befestigungsstellen des Wärmetauscherrohrs an einer Gehäusewand oder dergleichen vorgesehen.The cantilevered bend is more preferably removed from Fastening points of the heat exchanger tube on a housing wall or the like provided.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist das Wärmetauscherrohr um das Lüfterrad entlang des Umrisses einer rechtwinkligen Fläche geführt. Das Wärmetauscherrohr umgibt das Gebläse dabei in Form eines Quadrats oder Rechteckes, wobei die Rohrkrümmungen in den jeweiligen Ecken dieses Rechteckes liegen. Dadurch wird eine besonders große Fläche für den Wärmeaustausch geschaffen. Außerdem ist diese Anordnung bei den üblichen quaderförmigen Geometrien von Räumen zur Wärmebehandlung von Speisen vorteilhaft, da auf diese Weise eine optimale Raumausnutzung erreicht wird.According to a preferred embodiment of the invention the heat exchanger tube around the fan wheel along the outline a rectangular surface. The heat exchanger tube surrounds the fan in the form of a square or rectangle, the pipe curvatures in the respective Corners of this rectangle. This makes one special created a large area for heat exchange. In addition, this arrangement is the usual cuboid Geometries of rooms for the heat treatment of food advantageous because in this way an optimal use of space is achieved.

Wenn die freikragende Biegung an der Stelle oder in der Nähe der Stelle eines vollständigen Umlaufs des Wärmetauscherrohres um das Lüfterrad vorgesehen ist, kann das Wärmetauscherrohr im Anschluß an die Biegung parallel zu der Herrührung zurückgeführt werden, so daß eine kompakte und einfache Anordnung des Wärmetauscherrohres getroffen werden kann.If the cantilevered bend at the point or in the Near the place of a complete circulation of the heat exchanger tube around the fan wheel, the heat exchanger tube following the bend parallel to the Mr. Touch can be returned, so that a compact and simple arrangement of the heat exchanger tube can be made can.

Die Erfindung macht es möglich, ohne kostenintensive Wellrohre auszukommen und insbesondere Wärmetauscherrohre zu verwenden, die zumindest an der Außenseite glatt sind. Damit ist eine hygienische, vorteilhafte Reinigung möglich. Außerdem kann das Rohr ausreichend massiv gestaltet werden, so daß die Gefahr mechanischer Beschädigungen gering ist und die Lebensdauer und Betriebssicherheit gewährleistet sind.The invention makes it possible without expensive corrugated pipes get along and in particular heat exchanger tubes use that are at least smooth on the outside. This enables hygienic, advantageous cleaning. In addition, the tube can be made sufficiently solid be so that the risk of mechanical damage is low is and the lifespan and operational safety are guaranteed.

Bevorzugt wird eine Wärmetauschereinrichtung, wie zuvor beschrieben, in einer Vorrichtung zur Wärmebehandlung von Speisen eingesetzt, wobei die Wärmetauschereinrichtung im Garraum der Vorrichtung angeordnet sein kann, ohne daß nachteilige Einflüsse auf die zu garenden Lebensmittel zu befürchten wären. Die einfachen Reinigungsmöglichkeiten stellen einen besonderen Vorteil der Wärmetauschereinrichtung für die gedachte Verwendung dar.A heat exchanger device is preferred, as before described in a device for heat treatment of Food used, the heat exchanger device in Cooking space of the device can be arranged without adverse influences on the food to be cooked would be feared. The simple cleaning options represent a particular advantage of the heat exchanger device for the intended use.

Im folgenden wird die Erfindung beispielhaft anhand der beigefügten schematischen Zeichnungen beschrieben. Hierbei zeigen

Fig. 1
eine schematische perspektivische Ansicht einer Wärmetauschereinrichtung gemäß einer ersten Ausführungsform der Erfindung und
Fig. 2
eine schematische Teilansicht der freikragenden Biegung bei einer zweiten Ausführungform der Erfindung.
Fig.3
einen Querschnitt entlang der Linie III-III in Fig. 2.
The invention is described below by way of example with reference to the attached schematic drawings. Show here
Fig. 1
is a schematic perspective view of a heat exchanger device according to a first embodiment of the invention and
Fig. 2
is a schematic partial view of the cantilever bend in a second embodiment of the invention.
Fig. 3
a cross section along the line III-III in Fig. 2nd

Bei den in Fig. 1 und Fig. 2 dargestellten Wärmetauschereinrichtungen sind sämtliche umgebenden Komponenten, wie Gehäuseteile, Befestigungsteile, Anschlüsse und dergleichen weggelassen.In the heat exchanger devices shown in FIGS. 1 and 2 are all surrounding components, such as Housing parts, fastening parts, connections and the like omitted.

Bei dem in Fig. 1 gezeigten Ausführungsbeispiel ist um ein Radial-Lüfterrad 10, das durch einen nicht gezeigten Motor angetrieben wird, ein Wärmetauscherrohr 14 derart gelegt, daß es zunächst ausgehend von einer Brennkammer 12, in der sich ein Brenner befindet, bzw. auf die ein Brenner einwirkt, in wesentlichen entlang eines quadratischen Umrisses geführt ist, wobei in den Eckbereichen des gedachten Quadrates die Krümmung des Rohres nach Materialvorgabe gelegt ist. Nachdem das Wärmetauscherrohr 14 nahezu einen vollständigen Umlauf um das Gebläse 10 gebildet hat, wird es mit einer Richtungsänderung von 180° zurückgeführt, wobei eine freikragende Biegung 16 gebildet wird, die, entsprechend der zeichnerischen Darstellung, nach unten abhängt und einen zum Auffangen der Wärmedehnungen ausreichenden Abstand von anderen Systemkomponenten aufweist. Das Wärmetauscherrohr 14 wird dann am Umriß desselben Quadrates zurückgeführt und mündet in einen nicht dargestellten Anschluß. Solange die Befestigungsstellen ausreichend von der freikragenden Biegung 16 entfernt sind, sind diese von den Wärmespannungen entlastet, die zum größten Teil von der freikragenden Biegung 16 bzw. dem dadurch gebildeten Endabschnitt aufgenommen werden.In the embodiment shown in Fig. 1 is around Radial fan wheel 10 by a motor, not shown is driven, a heat exchanger tube 14 placed such that it is initially based on a combustion chamber 12 in the there is a burner or on which a burner acts, essentially along a square outline is guided, being in the corner areas of the imagined Squares the curvature of the pipe according to the material specification is laid. After the heat exchanger tube 14 almost one complete circulation around the fan 10 is formed it returned with a change of direction of 180 °, forming a cantilevered bend 16 which according to the drawing, down depends and one sufficient to absorb the thermal expansion Distance from other system components. The heat exchanger tube 14 is then on the outline of the same square returned and ends in a not shown Connection. As long as the attachment points are sufficient are removed from the cantilevered bend 16, these are relieved of the thermal stresses that for the most part of the cantilevered bend 16 or the one formed thereby End section are included.

Bei dem in Fig. 2 dargestellten Ausführungsbeispiel der Erfindung, das weitgehend dem Ausführungsbeispiel der Fig. 1 entspricht, treffen die beiden Rohrabschnitte 16a und 16b im Bereich der freikragenden Biegung 16 spitzwinklig aufeinander. Abseits der freikragenden Biegung, z.B. auf der Höhe der Linie A-A, hat das Wärmetauscherrohr einen im wesentlichen kreisförmigen Querschnitt mit einem Durchmesser D1. Im Bereich der freikragenden Biegung hingegen hat das Rohr im wesentlichen einen elliptischen Querschnitt, wobei die kleine Achse der Ellipse die Länge D1 und die große Achse der Ellipse die Länge D2 hat. Typischerweise beträgt D2 etwa das 1,2 bis 1,4-fache von D2, z.B. das 1,3-fache. Damit wird im Bereich der Biegung 16 eine Vergrößerung der Querschnittsfläche des Rohrs erreicht und damit einer Vergrößerung des Strömungswiderstands in diesem Bereich entgegengewirkt, der ansonsten aufgrund der Richtungsumkehr im Bereich der Biegung 16 und der damit verbundenen Wirbelbildung entstehen würde. Typischerweise ist die Querschnittsfläche des Wärmetauscherrohrs 14 im Bereich der Biegung 16 etwa 20% bis 40% größer als in den anderen Bereichen des Rohrs 14. In einer Abwandlung der dargestellten Ausführungsform kann auch ein vergrößerter Rohrquerschnitt in den übrigen gebogenen Bereichen des Wärmetauscherrohrs, insbesondere in den Kantenbereichen mit einer Umlenkung von im wesentlichen 90° vorgesehen sein. In the embodiment of the invention shown in FIG. 2, which largely corresponds to the embodiment of FIG. 1, the two pipe sections 16a and 16b meet at an acute angle in the region of the cantilevered bend 16. Aside from the cantilevered bend, for example at the level of line AA, the heat exchanger tube has an essentially circular cross section with a diameter D 1 . In the area of the cantilevered bend, on the other hand, the tube has an essentially elliptical cross section, the small axis of the ellipse having the length D 1 and the large axis of the ellipse having the length D 2 . Typically D 2 is about 1.2 to 1.4 times D2, for example 1.3 times. In this way, an increase in the cross-sectional area of the tube is achieved in the area of the bend 16 and thus an increase in the flow resistance in this area is counteracted, which would otherwise arise due to the reversal of direction in the area of the bend 16 and the associated vortex formation. Typically, the cross-sectional area of the heat exchanger tube 14 in the region of the bend 16 is approximately 20% to 40% larger than in the other regions of the tube 14. In a modification of the illustrated embodiment, an enlarged tube cross section in the other bent regions of the heat exchanger tube, in particular in the Edge areas can be provided with a deflection of substantially 90 °.

Die in der Beschreibung, in der Zeichnung sowie in den Ansprüchen offenbarten Merkmale der Erfindung können sowohl einzeln als auch in beliebiger Kombination für die Verwirklichung der Erfindung wesentlich sein. The in the description, in the drawing and in the Features of the invention disclosed in claims can be both individually as well as in any combination for the Realization of the invention may be essential.

BezugszeichenlisteReference list

1010th
LüfterradFan wheel
1212th
BrennkammerCombustion chamber
1414
WärmetauscherrohrHeat exchanger tube
1616
Freikragende BiegungCantilevered bend
16a, 16b16a, 16b
Rohrabschnitte im Bereich der BiegungPipe sections in the area of the bend

Claims (10)

Wärmetauschereinrichtung, mit einem Lüfterrad, insbesondere einem Radial-Lüfterrad, einem Brenner und zumindest einem dem Brenner zugeordneten Wärmetauscherrohr, welches das Lüfterrad umgibt, dadurch gekennzeichnet, daß das Wärmetauscherrohr (14) in zumindest einem Abschnitt zu einer freikragenden Biegung (16) gekrümmt ist. Heat exchanger device with a fan wheel, in particular a radial fan wheel, a burner and at least one heat exchanger tube associated with the burner and surrounding the fan wheel, characterized in that the heat exchanger tube (14) is curved in at least one section to form a cantilevered bend (16). Wärmetauschereinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Wärmetauscherrohr (14) im Bereich der freikragenden Biegung (16) einen vergrößerten Querschnitt aufweist.Heat exchanger device according to Claim 1, characterized in that the heat exchanger tube (14) has an enlarged cross section in the region of the cantilevered bend (16). Wärmetauschereinrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die beiden Rohrabschnitte (16a, 16b), welche die freikragende Biegung (16) bilden, in einem spitzen Winkel aufeinandertreffen.Heat exchanger device according to claim 2, characterized in that the two pipe sections (16a, 16b) which form the cantilevered bend (16) meet at an acute angle. Wärmetauschereinrichtung nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, daß das Wärmetauscherrohr im Bereich der freikragenden Biegung (16) einen ovalen Querschnitt aufweist.Heat exchanger device according to one of claims 2 or 3, characterized in that the heat exchanger tube has an oval cross section in the region of the cantilevered bend (16). Wärmetauschereinrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die freikragende Biegung (16) durch eine Richtungsänderung im Wärmetauscherrohr (14) um 180° gebildet ist.Heat exchanger device according to one of claims 1 to 4, characterized in that the cantilevered bend (16) is formed by a change in direction in the heat exchanger tube (14) by 180 °. Wärmetauschereinrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die freikragende Biegung (16) entfernt von Befestigungsstellen des Wärmetauscherrohres (14) an einer Gehäusewand oder dergleichen vorgesehen ist.Heat exchanger device according to one of claims 1 to 5, characterized in that the cantilevered bend (16) is provided on a housing wall or the like remote from fastening points of the heat exchanger tube (14). Wärmetauschereinrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Wärmetauscherrohr (14) um das Lüfterrad (10) entlang des Umrisses einer rechtwinkligen Fläche geführt ist. Heat exchanger device according to one of claims 1 to 6, characterized in that the heat exchanger tube (14) is guided around the fan wheel (10) along the outline of a rectangular surface. Wärmetauschereinrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die freikragende Biegung (16) an der Stelle oder in der Nähe der Stelle eines vollständigen Umlaufs des Wärmetauscherrohrs (14) um das Lüfterrad (10) vorgesehen ist.Heat exchanger device according to one of claims 1 to 7, characterized in that the cantilevered bend (16) is provided at or near the point of complete circulation of the heat exchanger tube (14) around the fan wheel (10). Wärmetauschereinrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Wärmetauscherrohr (14) ein an der Außenseite glattes Rohr ist.Heat exchanger device according to one of claims 1 to 8, characterized in that the heat exchanger tube (14) is a tube which is smooth on the outside. Verwendung der Wärmetauschereinrichtung nach einem der vorangehenden Ansprüche in einer Vorrichtung zur Wärmebehandlung von Speisen, wobei die Wärmetauschereinrichtung bevorzugt im Garraum der Vorrichtung angeordnet ist.Use of the heat exchanger device after of the preceding claims in a device for Heat treatment of food, the heat exchanger device preferably arranged in the cooking chamber of the device is.
EP97120541A 1997-01-30 1997-11-24 Arrangement of heat exchanger Expired - Lifetime EP0856705B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19703319 1997-01-30
DE19703319 1997-01-30
DE19708231 1997-02-28
DE19708231A DE19708231C2 (en) 1997-01-30 1997-02-28 Heat exchanger device for a device for heat treatment of food

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EP0856705A1 true EP0856705A1 (en) 1998-08-05
EP0856705B1 EP0856705B1 (en) 2002-02-20

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EP97120541A Expired - Lifetime EP0856705B1 (en) 1997-01-30 1997-11-24 Arrangement of heat exchanger

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EP (1) EP0856705B1 (en)
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Cited By (6)

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Publication number Priority date Publication date Assignee Title
EP0926447A1 (en) * 1997-12-23 1999-06-30 RATIONAL GmbH Cooking apparatus with heat-recirculation
DE102004004393B3 (en) * 2004-01-29 2005-05-25 Rational Ag Cooking device for cooking food comprises a device for receiving and dispensing a cleaning, clear rinsing and/or antiliming agent that is attached or provided in, in front of and/or behind a first opening in an air-guiding element
FR2899317A1 (en) * 2006-04-03 2007-10-05 Thirode Grandes Cuisines Poligny Heat exchanger for gas burner of e.g. gas oven, has connecting rod fixed to large diameter tubular part and small diameter pipes, where tubular part, connecting rod and pipes form ring while leaving central space of ring to be free
DE202011005261U1 (en) 2010-04-14 2011-10-27 Jaroslav Klouda Hot air heat exchanger for cooking appliances, such as combi steamers, baking and grilling appliances
ITTO20100632A1 (en) * 2010-07-21 2012-01-22 Premark Feg Llc IMPROVED HEAT EXCHANGER FOR A PROCESSING DEVICE FOR FOOD AND OVEN EQUIPPED
US9372005B2 (en) 2012-11-30 2016-06-21 Alto-Shaam, Inc. Heat exchanger for oven

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IT1311159B1 (en) * 1999-11-30 2002-03-04 Angelo Grandi Cucine Spa HEAT EXCHANGER DEVICE FOR OVENS USED FOR DIAL COOKING
NL1014044C2 (en) * 2000-01-10 2001-07-19 Levens Group B V Oven heated by gas burner.
US6188045B1 (en) 2000-04-03 2001-02-13 Alto-Shaam, Inc. Combination oven with three-stage water atomizer
US6346750B1 (en) * 2000-04-28 2002-02-12 Micron Technology, Inc. Resistance-reducing conductive adhesives for attachment of electronic components
US6371104B1 (en) 2000-07-21 2002-04-16 Wayne/Scott Fetzer Company Convection oven with gas burner
US7017571B2 (en) * 2003-06-18 2006-03-28 Convotherm Elektrogeräte GmbH Heat exchanger device
IT1392974B1 (en) 2009-02-17 2012-04-02 Premark Feg Llc HEAT EXCHANGER FOR A PROCESSING DEVICE FOR FOOD AND OVEN PROVIDED
CN105143773A (en) * 2013-06-07 2015-12-09 因诺恩股份有限公司 Heat exchanger for cooking apparatus
USD762289S1 (en) * 2014-07-15 2016-07-26 Dometic Sweden Ab Heat exchanger
IT201600094910A1 (en) * 2016-09-21 2018-03-21 Steelform Srl HEAT EXCHANGER FOR COOKING OVENS
JP6860374B2 (en) * 2017-02-17 2021-04-14 ホシザキ株式会社 Cooker

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0926447A1 (en) * 1997-12-23 1999-06-30 RATIONAL GmbH Cooking apparatus with heat-recirculation
DE102004004393B3 (en) * 2004-01-29 2005-05-25 Rational Ag Cooking device for cooking food comprises a device for receiving and dispensing a cleaning, clear rinsing and/or antiliming agent that is attached or provided in, in front of and/or behind a first opening in an air-guiding element
FR2899317A1 (en) * 2006-04-03 2007-10-05 Thirode Grandes Cuisines Poligny Heat exchanger for gas burner of e.g. gas oven, has connecting rod fixed to large diameter tubular part and small diameter pipes, where tubular part, connecting rod and pipes form ring while leaving central space of ring to be free
EP1843101A3 (en) * 2006-04-03 2012-12-05 Thirode Grandes Cuisines Poligny Heat-exchange device for a gas burner.
DE202011005261U1 (en) 2010-04-14 2011-10-27 Jaroslav Klouda Hot air heat exchanger for cooking appliances, such as combi steamers, baking and grilling appliances
DE102011017024A1 (en) 2010-04-14 2012-01-12 Jaroslav Klouda Thermal equipment for a cooking equipment, particularly comb steamer and rotational grill device, particularly cooking-, baking-, heating- or grill equipment for food preparation, has cooking chamber with heating system
ITTO20100632A1 (en) * 2010-07-21 2012-01-22 Premark Feg Llc IMPROVED HEAT EXCHANGER FOR A PROCESSING DEVICE FOR FOOD AND OVEN EQUIPPED
WO2012012479A1 (en) * 2010-07-21 2012-01-26 Premark Feg L.L.C. Food processing device with a heat exchanger
US9372005B2 (en) 2012-11-30 2016-06-21 Alto-Shaam, Inc. Heat exchanger for oven

Also Published As

Publication number Publication date
EP0856705B1 (en) 2002-02-20
ATE213532T1 (en) 2002-03-15
JP3021411B2 (en) 2000-03-15
JPH10246438A (en) 1998-09-14
US5915372A (en) 1999-06-29

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