EP1340945A1 - Device for treating and preparing foodstuffs with gas combustion heating and heat exchanger apparatus for such a device - Google Patents

Device for treating and preparing foodstuffs with gas combustion heating and heat exchanger apparatus for such a device Download PDF

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Publication number
EP1340945A1
EP1340945A1 EP02004761A EP02004761A EP1340945A1 EP 1340945 A1 EP1340945 A1 EP 1340945A1 EP 02004761 A EP02004761 A EP 02004761A EP 02004761 A EP02004761 A EP 02004761A EP 1340945 A1 EP1340945 A1 EP 1340945A1
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EP
European Patent Office
Prior art keywords
heat exchanger
tube
burner
cooking
fan wheel
Prior art date
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Granted
Application number
EP02004761A
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German (de)
French (fr)
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EP1340945B2 (en
EP1340945B1 (en
Inventor
Klaus Grühbaum
Johannes Hillmann
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Eloma GmbH
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Eloma GmbH Grosskuchentechnik
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Application filed by Eloma GmbH Grosskuchentechnik filed Critical Eloma GmbH Grosskuchentechnik
Priority to DK02004761.9T priority Critical patent/DK1340945T4/en
Priority to EP02004761A priority patent/EP1340945B2/en
Priority to DE50208407T priority patent/DE50208407D1/en
Priority to US10/375,382 priority patent/US7325480B2/en
Priority to JP2003054629A priority patent/JP2003262339A/en
Publication of EP1340945A1 publication Critical patent/EP1340945A1/en
Publication of EP1340945B1 publication Critical patent/EP1340945B1/en
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    • 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

Definitions

  • the present invention relates to a device for treating and preparing Food, the device being a cooking space in which the food is treated or be cooked, a motor-driven fan wheel that is used for circulation serves the cooking chamber atmosphere prevailing in the cooking chamber, a burner which is used for Combustion of a gas-air mixture is used, and a heat exchanger device has a heat exchanger tube device which surrounds the fan wheel.
  • the present invention relates to a heat exchanger device for a such device.
  • a heat exchanger device for cooking devices is for example from DE 197 08 231 A1 known.
  • the heat exchanger device of this prior art has a substantially horizontally arranged combustion chamber, which with a Heat exchanger pipe communicates in which the burned gas-air mixture is fed.
  • the heat exchanger tube runs along the four sides of the cooking space in the direction away from the combustion chamber and returns at the end of the fourth side by means of a cantilevered bend around the same distance parallel to put back the pipe string leaving the combustion chamber.
  • the only heat exchanger tube extends along the combustion chamber to below the cantilevered bend, from where the exhaust gas is discharged to the outside.
  • the present invention is therefore based on the object of a device for Treating and preparing food with a cooking space which is heated by gas firing, in which the heat exchanger device provides significantly improved heat transfer, which is significantly less Makes heating power possible, which means significantly lower exhaust gas losses arise.
  • the heat exchanger tube device at least two pipe strings has, which is continuously around the ventilation wheel essentially in a border extend the fan wheel, it is achieved that on the one hand an optimal flow path is created for the heating gas of the heat exchanger tube device and also a significantly improved heat exchanger function is achieved.
  • the heat exchanger function is advantageously increased by the fact that three Pipe strings are provided, d. H. the heated gas stream is divided into three parts.
  • the three tube strands are advantageously triangular in the tube longitudinal direction arranged.
  • the tubing strands extend essentially along all of them four sides of the cooking space, but not along the burner. This will, on the one hand realized a compact design of the cooking device and on the other hand the possible diameter of the burner chamber increases, creating a better and more complete combustion of the gas-air mixture is achieved.
  • Pipe string preferably all pipe strings have at least one flow deflecting device on. With the help of the flow deflector, the flowing gas from a laminar flow can be converted back into the turbulent flow, so that areas in the middle of the flow get out again and thus the efficiency of the heat exchange process is significantly increased. On the other hand this also creates the advantage that the length of the respective Pipe string can be significantly shortened compared to the prior art.
  • two flow deflection devices are in each pipe string Spaced from each other so that a multiple change in flow from a laminar flow to a turbulent flow to increase efficiency of the heat exchanger is realized.
  • the burner chamber arranged substantially vertically becomes a particularly efficient Combustion of the gas-air mixture achieved. But that is particularly advantageous Flame down in the burner chamber.
  • a guidance of the exhaust gas is made possible such that the gas path in The appliance outside the cooking space can be kept as short as possible.
  • the present invention also has a heat exchanger device for an apparatus for treating and preparing food, the subject Has heat exchanger tube device.
  • the heat exchanger tube device has at least two strings of tubing that are continuous around the fan wheel essentially extend in a border to the fan wheel.
  • FIG 1 is a schematic side view of the structure of an inventive Device 1 for treating and preparing food, in the form of a Combi steamer shown, which has a housing 3. Inside the case 3, a cooking chamber 5 is provided, in which the food to be treated is introduced can be. The front of the cooking chamber 5 is known per se Lockable and openable with a door 7.
  • a radial fan 9 Located behind a substantially vertically arranged air baffle 25 there is a radial fan 9, the structure of which can be clearly seen from FIG.
  • the radial fan 9 is driven by an asynchronous motor 11.
  • the asynchronous motor 11 is arranged behind a rear wall 13 of the cooking space 5 and has a drive shaft 15, which is connected to the radial fan wheel 9 for driving it.
  • a supply air duct 17 is provided in order to adjust the humidity in the cooking chamber 5 which a controllable flap 19 is arranged.
  • a water inlet 21 is also provided, which has a controllable inlet valve 23 has.
  • the water inlet 21 ends in the center area of the fan wheel 9, d. that is, the water to be evaporated is in the center of the fan wheel 9 injected and due to the rotation of the fan wheel 9 radially outwards flung, with part of the water already evaporating.
  • the between that Radial fan 9 and the baffle 5 provided air baffle 25 is used for distribution the air in the cooking space.
  • an outlet 27 is also provided, via which Liquid, especially vapors, can run off and also pressure equalization serves.
  • a heat exchanger device 29 extends around the radial fan wheel 9 is described in more detail below with reference to FIG. 2.
  • the heat exchanger device 29 extends around the radial fan wheel 9 and essentially follows the inner contour of the cooking device 1.
  • the heat exchanger device 29 is fed by a gas firing 31, which has a burner chamber 33.
  • the burner chamber 33 is as out Figure 2 can be seen, arranged vertically. It has a gas inlet 35 through which a gas-air mixture is introduced into the burner chamber 33.
  • a heat exchanger connection 39 is provided, which is connected to two pipe strands 41, which are the heat exchanger device 29 form.
  • the pipe strands 41 extend in a border or loop around the fan wheel 9 and end in an exhaust gas collection and discharge device 43rd
  • Each pipe string 41 has a substantially short first vertical pipe section 45, a first substantially horizontal tube section 47, a second substantially vertical tube section 49 and a second substantially horizontal pipe section.
  • the pipe sections 45 to 51 are over Pipe bend sections 53 connected.
  • the heat exchanger gas moves in the Pipe string 41 in front of the flow deflector 55 essentially according to one Flow profile 57.
  • the laminar Flow 57 swirls as indicated by arrow 58. Then it turns ideally, a steady flow, as is the case with the turbulent flow profile 59 is specified.
  • FIG 2 there are schematically only two flow deflectors 55 in the foremost Pipe string 41 shown. At least two flow deflection devices are advantageous 55 arranged in each of the tubing strings 51, wherein also a further flow deflector 55 in the first horizontal pipe section 47 can be arranged and / or a further flow deflection device 55 can be arranged in the second horizontal tube section 51.
  • FIG 2 schematically illustrated configurations of the flow deflection device 55 in that the back pressure and thus the fan power to be applied can be minimized.
  • the fan can be kept small, which is probably the compact design of the overall device also promotes energy consumption reduced for the operation of the blower.
  • the gas firing 31 is shown schematically in FIG.
  • a substantially circular grid 61 is arranged, and the gas-air mixture, which enters the burner chamber 33 via the gas inlet 35 flows through the grating 61.
  • An ignition device is located below the grating 61 63, which ignites the gas-air mixture and a dashed firing cone 65 forms, which extends vertically downward in the burner chamber 33.
  • the arrangement of the flame cone 65 has the advantage of being essentially complete Combustion of the gas-air mixture, due to the grid itself the flame cone 65 from a large number of individual flames due to the Grid structure of the grid 61 is composed.
  • the present invention thus provides a device for treatment and preparation of foods with a very advantageous gas firing and advantageous switched off heat exchange device created.

Abstract

The appliance for the treatment and preparation of foodstuffs has a cooking chamber with a motor driven fan (9) to circulate the atmosphere prevailing within the chamber, a burner (31), and a heat exchanger unit (29) encompassing the fan. The heat exchanger unit has a piping arrangement with at least two and possibly three sets of piping (41) which extend continuously in the fashion of a border or loop around the fan. The pipes extend generally along all four sides of the cooking chamber but not along the burner. An Independent claim is included for a heat exchanger for the aforesaid appliance.

Description

Die vorliegende Erfindung betrifft ein Gerät zum Behandeln und Zubereiten von Nahrungsmitteln, wobei das Gerät einen Garraum, in dem die Nahrungsmittel behandelt bzw. gegart werden, ein motorgetriebenes Lüfterrad, das zur Umwälzung der im Garraum herrschenden Garraumatmosphäre dient, einen Brenner, der zur Verbrennung eines Gas-Luftgemisches dient, und eine Wärmetauschereinrichtung aufweist, die eine Wärmetauscherrohreinrichtung aufweist, die das Lüfterrad umgibt.The present invention relates to a device for treating and preparing Food, the device being a cooking space in which the food is treated or be cooked, a motor-driven fan wheel that is used for circulation serves the cooking chamber atmosphere prevailing in the cooking chamber, a burner which is used for Combustion of a gas-air mixture is used, and a heat exchanger device has a heat exchanger tube device which surrounds the fan wheel.

Weiterhin betrifft die vorliegende Erfindung eine Wärmetauschereinrichtung für ein derartiges Gerät.Furthermore, the present invention relates to a heat exchanger device for a such device.

Eine Wärmetauschereinrichtung für Gargeräte ist beispielsweise aus der DE 197 08 231 A1 bekannt. Die Wärmetauschereinrichtung dieses Standes der Technik weist eine im wesentlichen horizontal angeordnete Brennkammer auf, die mit einem Wärmetauscherrohr in Verbindung steht, in das das verbrannte Gas-Luftgemisch eingespeist wird. Das Wärmetauscherrohr läuft entlang der vier Seiten des Garraums in die Richtung weg von der Brennkammer und kehrt am Ende der vierten Seite mittels einer freikragenden Biegung um, um dieselbe Strecke parallel zu dem die Brennkammer verlassenen Rohrstrang wieder zurückzulegen. Darüber hinaus erstreckt sich das einzige Wärmetauscherrohr entlang der Brennkammer bis unterhalb der freikragenden Biegung, um von dort das Abgas nach außen abzuführen.A heat exchanger device for cooking devices is for example from DE 197 08 231 A1 known. The heat exchanger device of this prior art has a substantially horizontally arranged combustion chamber, which with a Heat exchanger pipe communicates in which the burned gas-air mixture is fed. The heat exchanger tube runs along the four sides of the cooking space in the direction away from the combustion chamber and returns at the end of the fourth side by means of a cantilevered bend around the same distance parallel to put back the pipe string leaving the combustion chamber. About that in addition, the only heat exchanger tube extends along the combustion chamber to below the cantilevered bend, from where the exhaust gas is discharged to the outside.

Ein besonderer Nachteil bei diesem Stand der Technik ergibt sich dadurch, daß einerseits ein sehr langer Weg des Heizgases in einem Wärmetauscherrohr benötigt wird, wodurch nur eine relativ schwache Wärmetauscherleistung verwirklicht wird, wobei strömungstechnisch der Verlauf des Wärmetauscherrohrs durch Umkehrung der Strömungsrichtung gemäß diesem Stand der Technik äußerst ungünstig ist.A particular disadvantage of this prior art arises from the fact that on the one hand, a very long way of the heating gas in a heat exchanger tube is required is realized, whereby only a relatively weak heat exchanger performance is the flow of the heat exchanger tube by reversal the flow direction according to this prior art is extremely unfavorable is.

Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, ein Gerät zum Behandeln und Zubereiten von Nahrungsmitteln mit einem Garraum zu schaffen, welches durch Gasbefeuerung beheizt wird, bei dem die Wärmetauschereinrichtung eine erheblich verbesserte Wärmeübertragung liefert, was eine erheblich geringere Heizleistung möglich macht, wodurch erheblich geringere Abgasverluste entstehen.The present invention is therefore based on the object of a device for Treating and preparing food with a cooking space which is heated by gas firing, in which the heat exchanger device provides significantly improved heat transfer, which is significantly less Makes heating power possible, which means significantly lower exhaust gas losses arise.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.This object is solved by the features of claim 1.

Dadurch, daß die Wärmetauscherrohreinrichtung wenigstens zwei Rohrstränge aufweist, die sich kontinuierlich um das Lüftrad im wesentlichen in einer Umrandung des Lüfterrads erstrecken, wird erreicht, daß einerseits ein optimaler Strömungsweg für das Heizgas der Wärmetauscherrohreinrichtung geschaffen wird und zudem eine erheblich verbesserte Wärmetauscherfunktion erreicht wird.Characterized in that the heat exchanger tube device at least two pipe strings has, which is continuously around the ventilation wheel essentially in a border extend the fan wheel, it is achieved that on the one hand an optimal flow path is created for the heating gas of the heat exchanger tube device and also a significantly improved heat exchanger function is achieved.

Die Wärmetauscherfunktion wird vorteilhafterweise dadurch noch erhöht, daß drei Rohrstränge vorgesehen sind, d. h. der erhitzte Gasstrom wird in drei Teile aufgeteilt.The heat exchanger function is advantageously increased by the fact that three Pipe strings are provided, d. H. the heated gas stream is divided into three parts.

Vorteilhafterweise sind die drei Rohrstränge in Rohrlängsrichtung dreieckförmig angeordnet. Dies hat den besonderen Vorteil, daß die Wärmetauscherrohre zusätzlich als höchst effiziente Verdampfungseinrichtung dienen, wenn, wie bei der vorliegenden Erfindung vorgesehen, Wasser über eine Zuführleitung direkt in das Lüfterrad eingespritzt wird und von diesem nach außen befördert wird. Durch die radiale Ausbringung des eingespritzten Wassers wird das am Außenumfang des Lüfterrads noch nicht verdampfte Wasser auf die Rohrstränge geschleudert und kann dort endgültig verdampfen. Damit wird vorteilhafterweise auch vermieden, daß noch nicht verdampftes Wasser an die Gargerätinnenwand geschleudert.The three tube strands are advantageously triangular in the tube longitudinal direction arranged. This has the particular advantage that the heat exchanger tubes are additional serve as a highly efficient evaporation device if, as with the Present invention provided water directly into the via a feed line Fan wheel is injected and is transported from this to the outside. Through the radial discharge of the injected water is on the outer circumference of the Fan wheel not yet evaporated water and hurled onto the tubing strings can finally evaporate there. This advantageously also avoids that water that has not yet evaporated is thrown against the inside of the cooking appliance.

Vorteilhafterweise erstrecken sich die Rohrstränge im wesentlichen entlang aller vier Seiten des Garraums, jedoch nicht entlang des Brenners. Dadurch wird einerseits eine kompakte Bauweise des Gargeräts verwirklicht und andererseits der mögliche Durchmesser der Brennnerkammer erhöht, wodurch eine bessere und vollständigere Verbrennung des Gas-Luftgemisches erreicht wird.Advantageously, the tubing strands extend essentially along all of them four sides of the cooking space, but not along the burner. This will, on the one hand realized a compact design of the cooking device and on the other hand the possible diameter of the burner chamber increases, creating a better and more complete combustion of the gas-air mixture is achieved.

Bei der Strömung eines Gases in einem Rohr stellt sich ein Strömungsprofil derart ein, daß aufgrund der Reibung des Gases an der Rohrinnenwand dort die geringste Strömungsgeschwindigkeit herrscht und in der Mitte die höchste Geschwindigkeit. Dies führt zu einer verminderten Wärmetauscherleistung, weil die schnell strömende mittlere Schicht des Gases einer Wärmetauscherfunktion nur wenig oder gar nicht zugebracht werden kann. Mit besonderem Vorteil weist wenigstens ein Rohrstrang bevorzugt alle Rohrstränge wenigstens eine Strömungsablenkeinrichtung auf. Mit Hilfe der Strömungsablenkeinrichtung kann das strömende Gas von einer laminaren Strömung wieder in die turbulente Strömung überführt werden, so daß Bereiche in der Mitte der Strömung wieder nach außen gelangen und damit der Wirkungsgrad des Wärmetauschsvorgangs deutlich erhöht wird. Zum anderen wird dadurch auch der Vorteil geschaffen, daß die Länge des jeweiligen Rohrstrangs gegenüber dem Stand der Technik erheblich verkürzt werden kann.When a gas flows in a pipe, a flow profile arises in this way a that due to the friction of the gas on the inner wall of the tube there the least Flow speed prevails and in the middle the highest speed. This leads to a reduced heat exchanger performance because the fast flowing middle layer of the gas of a heat exchanger function little or no cannot be spent. At least one has a particular advantage Pipe string preferably all pipe strings have at least one flow deflecting device on. With the help of the flow deflector, the flowing gas from a laminar flow can be converted back into the turbulent flow, so that areas in the middle of the flow get out again and thus the efficiency of the heat exchange process is significantly increased. On the other hand this also creates the advantage that the length of the respective Pipe string can be significantly shortened compared to the prior art.

Vorteilhafterweise sind in jedem Rohrstrang zwei Strömungsablenkeinrichtungen im Abstand voneinander angeordnet, so daß ein mehrfaches Verändern der Strömung von einer laminaren Strömung in eine turbulente Strömung zur Erhöhung des Wirkungsgrads des Wärmetauschers verwirklicht wird. Dadurch, daß die Brennerkammer im wesentlichen vertikal angeordnet ist, wird eine besonders effiziente Verbrennung des Gas-Luftgemischs erzielt. Besonders vorteilhaft ist aber die Flamme in der Brennerkammer nach unten. Dies hat den Vorteil, daß die heißeste Strömungsmenge unten im Garraum eingeleitet wird, wodurch eine gleichmäßigere Wärmeverteilung im Garraum erreicht wird. Weiterhin ergibt sich der große Vorteil, daß eine Führung des Abgases dergestalt ermöglicht wird, daß der Gasweg im Gerät außerhalb des Garraums möglichst kurzgehalten werden kann.Advantageously, two flow deflection devices are in each pipe string Spaced from each other so that a multiple change in flow from a laminar flow to a turbulent flow to increase efficiency of the heat exchanger is realized. Because the burner chamber arranged substantially vertically, becomes a particularly efficient Combustion of the gas-air mixture achieved. But that is particularly advantageous Flame down in the burner chamber. This has the advantage of being the hottest Flow rate is introduced at the bottom of the cooking space, creating a more uniform Heat distribution in the cooking space is achieved. There is also the great advantage that a guidance of the exhaust gas is made possible such that the gas path in The appliance outside the cooking space can be kept as short as possible.

Die vorliegende Erfindung hat auch eine Wärmetauschereinrichtung für ein Gerät zum Behandeln und Zubereiten von Nahrungsmitteln zum Gegenstand, die eine Wärmetauscherrohreinrichtung aufweist. Die Wärmetauscherrohreinrichtung weist wenigstens zwei Rohrstränge auf, die sich kontinuierlich um das Lüfterrad im wesentlichen in einer Umrandung an das Lüfterrad erstrecken.The present invention also has a heat exchanger device for an apparatus for treating and preparing food, the subject Has heat exchanger tube device. The heat exchanger tube device has at least two strings of tubing that are continuous around the fan wheel essentially extend in a border to the fan wheel.

Weitere Einzelheiten, Merkmale und Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung unter Bezugnahme auf die Zeichnung. Darin zeigt:

Fig. 1
eine Seitenschnittansicht schematisch den Aufbau eines erfindungsgemäßen Geräts zum Behandeln und Zubereiten von Nahrungsmitteln in Form eines Kombidämpfers;
Fig. 2
in perspektivischer Ansicht die erfindungsgemäße Wärmetauschereinrichtung, die sich um das Radiallüfterrad erstreckt;
Fig. 3
eine schematische Darstellung eines Wärmetauscherrohres mit einer Strömungsablenkeinrichtung; und
Fig. 4
eine schematische Darstellung einer Brennerkammer mit dargestellter Flamme.
Further details, features and advantages of the present invention will become apparent from the following description with reference to the drawing. It shows:
Fig. 1
a side sectional view schematically shows the structure of an inventive device for treating and preparing food in the form of a combi steamer;
Fig. 2
in perspective view, the heat exchanger device according to the invention, which extends around the radial fan wheel;
Fig. 3
a schematic representation of a heat exchanger tube with a flow deflection device; and
Fig. 4
is a schematic representation of a burner chamber with the flame shown.

In Figur 1 ist schematisch in Seitenansicht der Aufbau eines erfindungsgemäßen Geräts 1 zum Behandeln und Zubereiten von Nahrungsmitteln, in Form eines Kombidämpfers dargestellt, das ein Gehäuse 3 aufweist. Innerhalb des Gehäuses 3 ist ein Garraum 5 vorgesehen, in dem die zu behandelnden Nahrungsmittel eingebracht werden können. Der Garraum 5 ist an seiner Vorderseite in an sich bekannter Weise mit einer Tür 7 verschließbar und öffenbar.In Figure 1 is a schematic side view of the structure of an inventive Device 1 for treating and preparing food, in the form of a Combi steamer shown, which has a housing 3. Inside the case 3, a cooking chamber 5 is provided, in which the food to be treated is introduced can be. The front of the cooking chamber 5 is known per se Lockable and openable with a door 7.

Hinter einem im wesentlichen vertikal angeordneten dem Luftleitblech 25 befindet sich ein Radiallüfter 9, dessen Aufbau deutlich aus Figur 2 ersichtlich ist. Der Radiallüfter 9 wird von einem Asynchron-Motor 11 angetrieben. Der Asynchron-Motor 11 ist hinter einer Rückwand 13 des Garraums 5 angeordnet, und weist eine Antriebswelle 15 auf, die mit dem Radiallüfterrad 9 zu dessen Antrieb verbunden ist. Located behind a substantially vertically arranged air baffle 25 there is a radial fan 9, the structure of which can be clearly seen from FIG. The radial fan 9 is driven by an asynchronous motor 11. The asynchronous motor 11 is arranged behind a rear wall 13 of the cooking space 5 and has a drive shaft 15, which is connected to the radial fan wheel 9 for driving it.

Zur Einstellung der Feuchte in dem Garraum 5 ist ein Zuluftkanal 17 vorgesehen, in dem eine steuerbare Klappe 19 angeordnet ist. Zur Erzeugung von Dampf im Garraum 5 ist weiterhin ein Wasserzulauf 21 vorgesehen, der ein steuerbares Zulaufventil 23 aufweist.A supply air duct 17 is provided in order to adjust the humidity in the cooking chamber 5 which a controllable flap 19 is arranged. For generating steam in the cooking space 5, a water inlet 21 is also provided, which has a controllable inlet valve 23 has.

Wie aus Figur 1 ersichtlich, endet der Wasserzulauf 21 im Mittenbereich des Lüfterrads 9, d. h., das zu verdampfende Wasser wird in den Mittenbereich des Lüfterrads 9 eingespritzt und aufgrund der Drehung des Lüfterrads 9 radial nach außen geschleudert, wobei bereits ein Teil des Wassers verdampft. Das zwischen dem Radiallüfter 9 und dem Garraum 5 vorgesehene Luftleitblech 25 dient zur Verteilung der Luft im Garraum.As can be seen from FIG. 1, the water inlet 21 ends in the center area of the fan wheel 9, d. that is, the water to be evaporated is in the center of the fan wheel 9 injected and due to the rotation of the fan wheel 9 radially outwards flung, with part of the water already evaporating. The between that Radial fan 9 and the baffle 5 provided air baffle 25 is used for distribution the air in the cooking space.

Im unteren Bereich des Geräts 1 ist weiterhin ein Ablauf 27 vorgesehen, über den Flüssigkeit, insbesondere Wrasen ablaufen kann und der auch dem Druckausgleich dient.In the lower area of the device 1, an outlet 27 is also provided, via which Liquid, especially vapors, can run off and also pressure equalization serves.

Um das Radiallüfterrad 9 erstreckt sich eine Wärmetauschereinrichtung 29, die nachfolgend näher unter Bezugnahme auf Figur 2 beschrieben wird.A heat exchanger device 29 extends around the radial fan wheel 9 is described in more detail below with reference to FIG. 2.

Wie aus Figur 2 ersichtlich, erstreckt sich die Wärmetauschereinrichtung 29 um das Radiallüfterrad 9 und folgt dabei im wesentlichen der Innenkontur des Gargeräts 1. Die Wärmetauschereinrichtung 29 wird von einer Gasbefeuerung 31 gespeist, die eine Brennerkammer 33 aufweist. Die Brennerkammer 33 ist, wie aus Figur 2 ersichtlich, vertikal angeordnet. Sie weist einen Gaseintritt 35 auf, durch den ein Gas-Luftgemisch in die Brennerkammer 33 eingeleitet wird.As can be seen from FIG. 2, the heat exchanger device 29 extends around the radial fan wheel 9 and essentially follows the inner contour of the cooking device 1. The heat exchanger device 29 is fed by a gas firing 31, which has a burner chamber 33. The burner chamber 33 is as out Figure 2 can be seen, arranged vertically. It has a gas inlet 35 through which a gas-air mixture is introduced into the burner chamber 33.

Am unteren Ausgang 37 der Brennerkammer 33 ist ein Wärmetauscheranschluß 39 vorgesehen, der in Verbindung steht mit zwei Rohrsträngen 41, die die Wärmetauschereinrichtung 29 bilden.At the lower outlet 37 of the burner chamber 33 is a heat exchanger connection 39 is provided, which is connected to two pipe strands 41, which are the heat exchanger device 29 form.

Wie aus Figur 2 ersichtlich, erstrecken sich die Rohrstränge 41 in einer Umrandung oder Schleife um das Lüfterrad 9 und enden in einer Abgassammel- und Ausbringeinrichtung 43. As can be seen from Figure 2, the pipe strands 41 extend in a border or loop around the fan wheel 9 and end in an exhaust gas collection and discharge device 43rd

Jeder Rohrstrang 41 weist einen im wesentlichen kurzen ersten vertikalen Rohrabschnitt 45, einen ersten im wesentlichen horizontalen Rohrabschnitt 47, einen zweiten im wesentlichen vertikalen Rohrabschnitt 49 und einen zweiten im wesentlichen horizontalen Rohrabschnitt auf. Die Rohrabschnitte 45 bis 51 sind über Rohrkrümmungsabschnitte 53 verbunden.Each pipe string 41 has a substantially short first vertical pipe section 45, a first substantially horizontal tube section 47, a second substantially vertical tube section 49 and a second substantially horizontal pipe section. The pipe sections 45 to 51 are over Pipe bend sections 53 connected.

Wie aus Figur 2 weiterhin ersichtlich, ist in dem zweiten vertikalen Rohrabschnitt 49 und dem zweiten horizontalen Rohrabschnitt 51 eine Strömungsablenkeinrichtung 55 angeordnet, die deutlicher auch in Figur 3 dargestellt ist.As can also be seen from FIG. 2, there is 49 in the second vertical tube section and the second horizontal pipe section 51 a flow deflector 55 arranged, which is also shown more clearly in Figure 3.

Wie aus Figur 3 ersichtlich, bewegt sich das Wärmetauschergas in dem Rohrstrang 41 vor der Strömungsablenkeinrichtung 55 im wesentlichen gemäß einem Strömungsprofil 57. Mittels der Strömungsablenkeinrichtung 55 wird die laminare Strömung 57 verwirbelt, wie mit dem Pfeil 58 angegeben. Danach stellt sich im Idealfalle eine gleichmäßige Strömung ein, wie dies mit dem turbulenten Strömungsprofil 59 angegeben ist.As can be seen from Figure 3, the heat exchanger gas moves in the Pipe string 41 in front of the flow deflector 55 essentially according to one Flow profile 57. The laminar Flow 57 swirls as indicated by arrow 58. Then it turns ideally, a steady flow, as is the case with the turbulent flow profile 59 is specified.

In Figur 2 sind schematisch nur zwei Strömungsablenkeinrichtungen 55 im vordersten Rohrstrang 41 dargestellt. Vorteilhafterweise sind wenigstens zwei Strömungsablenkeinrichtungen 55 in jedem der Rohrstränge 51 angeordnet, wobei auch eine weitere Strömungsablenkeinrichtung 55 in dem ersten Horizontalrohrabschnitt 47 angeordnet sein kann und/oder eine weitere Strömungsablenkeinrichtung 55 in dem zweiten Horizontalrohrabschnitt 51 angeordnet sein kann.In Figure 2 there are schematically only two flow deflectors 55 in the foremost Pipe string 41 shown. At least two flow deflection devices are advantageous 55 arranged in each of the tubing strings 51, wherein also a further flow deflector 55 in the first horizontal pipe section 47 can be arranged and / or a further flow deflection device 55 can be arranged in the second horizontal tube section 51.

Ein besonderer Vorteil der vorliegenden Erfindung ergibt sich auch aus der in Figur 2 schematisch dargestellten Ausgestaltungen der Strömungsablenkeinrichtung 55 dahingehend, daß der Staudruck und somit die aufzubringende Gebläseleistung minimiert werden kann. Somit kann das Gebläse klein gehalten werden, was wohl die kompakte Bauweise des Gesamtgeräts fördert als auch den Energieaufwand für den Betrieb des Gebläses verringert.A particular advantage of the present invention also results from that in FIG 2 schematically illustrated configurations of the flow deflection device 55 in that the back pressure and thus the fan power to be applied can be minimized. Thus, the fan can be kept small, which is probably the compact design of the overall device also promotes energy consumption reduced for the operation of the blower.

In Figur 1 ist die dreieckförmige Anordnung der Rohrstränge 41 deutlich erkennbar. Das von dem Lüfterrad 9 in Radialrichtung herausgeschleuderte Wasser trifft auf die Rohrstränge 41, wobei wie aus Figur 1 ersichtlich, diese vollständig den radialen Ausbringraum des Lüfters abdecken. Damit trifft das herausgeschleuderte Wasser auf die Rohrstränge 41 und nicht auf die Innenwandung 6 des Gargeräts, wodurch eine optimale Verdampfung des eingebrachten Wassers erzielt wird.The triangular arrangement of the pipe strands 41 can be clearly seen in FIG. The water thrown out by the fan wheel 9 in the radial direction hits the pipe strands 41, as shown in Figure 1, these completely the radial Cover the spreading area of the fan. This hits what is thrown out Water on the pipe strands 41 and not on the inner wall 6 of the cooking device, whereby an optimal evaporation of the introduced water is achieved.

In Figur 4 ist die Gasbefeuerung 31 schematisch dargestellt. In der Brennerkammer 33 ist ein im wesentlichen kreisförmiges Gitter 61 angeordnet, und das Gas-Luftgemisch, das über den Gaseintritt 35 in die Brennerkammer 33 eintritt, durchströmt das Gitter 61. Unterhalb des Gitters 61 befindet sich eine Zündeinrichtung 63, die das Gas-Luftgemisch zündet und sich ein gestrichelt dargestellter Brennkegel 65 ausbildet, der sich vertikal nach unten in der Brennerkammer 33 erstreckt. Die Anordnung des Flammenkegels 65 hat den Vorteil einer im wesentlichen vollständigen Verbrennung des Gas-Luftgemisches, wobei aufgrund des Gitters sich der Flammenkegel 65 aus einer Vielzahl von einzelnen Flammen bedingt durch die Gitterstruktur des Gitters 61 zusammensetzt.The gas firing 31 is shown schematically in FIG. In the burner chamber 33 a substantially circular grid 61 is arranged, and the gas-air mixture, which enters the burner chamber 33 via the gas inlet 35 flows through the grating 61. An ignition device is located below the grating 61 63, which ignites the gas-air mixture and a dashed firing cone 65 forms, which extends vertically downward in the burner chamber 33. The arrangement of the flame cone 65 has the advantage of being essentially complete Combustion of the gas-air mixture, due to the grid itself the flame cone 65 from a large number of individual flames due to the Grid structure of the grid 61 is composed.

Mit der vorliegenden Erfindung wird somit ein Gerät zum Behandeln und Zubereiten von Nahrungsmitteln mit sehr vorteilhaft ausgestalteter Gasbefeuerung und vorteilhaft ausgeschalteter Wärmetauscheinrichtung geschaffen.The present invention thus provides a device for treatment and preparation of foods with a very advantageous gas firing and advantageous switched off heat exchange device created.

Claims (11)

Gerät (1) zum Behandeln und Zubereiten von Nahrungsmitteln mit
einem Garraum, in dem die Nahrungsmittel behandelt bzw. gegart werden,
einem motorgetrieben Lüfterrad (9), das zur Umwälzung der im Garraum herrschenden Garraumatmosphäre dient,
einem Brenner (31), der zur Verbrennung eines Gas-Luftgemisches dient, und
einer Wärmetauschereinrichtung (29), die eine Wärmetauscherrohreinrichtung (41) aufweist, die das Lüfterrad (9) umgibt,
dadurch gekennzeichnet, daß
die Wärmetauscherrohreinrichtung wenigstens zwei Rohrstränge (41) aufweist, die sich kontinuierlich im wesentlichen in einer Umrandung oder Schleife um das Lüfterrad (9) erstrecken.Device (1) for treating and preparing food with
a cooking space in which the food is treated or cooked,
a motor-driven fan wheel (9), which serves to circulate the cooking chamber atmosphere in the cooking chamber,
a burner (31) which is used to burn a gas-air mixture, and
a heat exchanger device (29) which has a heat exchanger tube device (41) which surrounds the fan wheel (9),
characterized in that
the heat exchanger tube device has at least two tube strands (41) which extend substantially in a border or loop around the fan wheel (9). Gargerät nach Anspruch 1, dadurch gekennzeichnet, daß drei Rohrstränge (41) vorgesehen sind.Cooking appliance according to claim 1, characterized in that three tube strings (41) are provided. Gargerät nach Anspruch 2, dadurch gekennzeichnet, daß die drei Rohrstränge (41) in Rohrlängsrichtung dreieckförmig angeordnet sind.Cooking appliance according to claim 2, characterized in that the three tube strands (41) are arranged triangularly in the tube longitudinal direction. Gargerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß sich die Rohrstränge (41) im wesentlichen entlang aller vier Seiten des Garraums jedoch nicht entlang des Brenners (31) erstrecken .Cooking appliance according to one of claims 1 to 3, characterized in that the tube strands (41) extend substantially along all four sides of the cooking space but not along the burner (31). Gargerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß in wenigstens einem Rohrstrang (41) wenigstens eine Strömungsablenkeinrichtung (55) angeordnet ist. Cooking appliance according to one of claims 1 to 4, characterized in that at least one flow deflecting device (55) is arranged in at least one tube string (41). Gargerät nach Anspruch 5, dadurch gekennzeichnet, daß in jedem Rohrstrang zwei Strömungsablenkeinrichtungen (55) im Abstand voneinander angeordnet sind.Cooking appliance according to claim 5, characterized in that two flow deflection devices (55) are arranged at a distance from each other in each pipe string. Gargerät nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Brennerkammer (33) des Brenners (31) im wesentlich vertikal angeordnet ist.Cooking appliance according to one of claims 1 to 6, characterized in that the burner chamber (33) of the burner (31) is arranged substantially vertically. Gargerät nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Flamme (65) in der Brennerkammer (33) nach unten angeordnet ist.Cooking appliance according to one of claims 1 to 7, characterized in that the flame (65) in the burner chamber (33) is arranged downwards. Wärmetauschereinrichtung (29) für ein Gerät zum Behandeln und Zubereiten von Nahrungsmitteln, mit einer Wärmetauscherrohreinrichtung, dadurch gekennzeichnet, daß die Wärmetauscherrohreinrichtung wenigstens zwei Rohrstränge (41) aufweist, die sich kontinuierlich im wesentlichen in einer Umrandung oder Schleife um das Lüfterrad (9) des Geräts (1) erstrecken.Heat exchanger device (29) for a device for treating and preparing food, with a heat exchanger pipe device, characterized in that the heat exchanger pipe device has at least two pipe strands (41) which are essentially continuous in a border or loop around the fan wheel (9) of the device (1) extend. Wärmetauschereinrichtung nach Anspruch 9, dadurch gekennzeichnet, daß sie drei parallel zueinander verlaufende Rohrstränge (41) aufweist, die sich kontinuierlich um das Lüfterrad (9) jedoch nicht entlang des Brenners (31) erstrecken.Heat exchanger device according to Claim 9, characterized in that it has three tubular strands (41) which run parallel to one another and do not extend continuously around the fan wheel (9) but along the burner (31). Wärmetauschereinrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß in wenigstens einem Rohrstrang (41) wenigstens eine Strömungsablenkeinrichtung (55) vorgesehen ist.Heat exchanger device according to claim 9 or 10, characterized in that at least one flow deflecting device (55) is provided in at least one pipe string (41).
EP02004761A 2002-03-01 2002-03-01 Device for treating and preparing foodstuffs with gas combustion heating Expired - Lifetime EP1340945B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DK02004761.9T DK1340945T4 (en) 2002-03-01 2002-03-01 Apparatus for the processing and preparation of food with gas-fired heating and heat exchanger device for such apparatus
EP02004761A EP1340945B2 (en) 2002-03-01 2002-03-01 Device for treating and preparing foodstuffs with gas combustion heating
DE50208407T DE50208407D1 (en) 2002-03-01 2002-03-01 Apparatus for treating and preparing foodstuffs with gas-fired heating
US10/375,382 US7325480B2 (en) 2002-03-01 2003-02-27 Apparatus for treating and preparing food by gas-fired heating and a heat exchange device for such an apparatus
JP2003054629A JP2003262339A (en) 2002-03-01 2003-02-28 Apparatus for treating and preparing food by gas combustion heating and heat exchanger means for such apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02004761A EP1340945B2 (en) 2002-03-01 2002-03-01 Device for treating and preparing foodstuffs with gas combustion heating

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EP1340945B1 EP1340945B1 (en) 2006-10-11
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Also Published As

Publication number Publication date
JP2003262339A (en) 2003-09-19
DK1340945T3 (en) 2007-02-19
DK1340945T4 (en) 2010-01-25
EP1340945B2 (en) 2009-08-26
US20030164096A1 (en) 2003-09-04
EP1340945B1 (en) 2006-10-11
DE50208407D1 (en) 2006-11-23
US7325480B2 (en) 2008-02-05

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