EP1970635B1 - Hot air baking oven with baffle plates - Google Patents

Hot air baking oven with baffle plates Download PDF

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Publication number
EP1970635B1
EP1970635B1 EP08011554A EP08011554A EP1970635B1 EP 1970635 B1 EP1970635 B1 EP 1970635B1 EP 08011554 A EP08011554 A EP 08011554A EP 08011554 A EP08011554 A EP 08011554A EP 1970635 B1 EP1970635 B1 EP 1970635B1
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EP
European Patent Office
Prior art keywords
fan
separating wall
inner area
exhaust openings
muffle
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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.)
Not-in-force
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EP08011554A
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German (de)
French (fr)
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EP1970635A2 (en
EP1970635A3 (en
Inventor
Peter Renggli-Ehrat
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V-Zug AG
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V-Zug AG
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Publication date
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Priority to AT08011554T priority Critical patent/ATE550608T1/en
Priority to EP08011554A priority patent/EP1970635B1/en
Publication of EP1970635A2 publication Critical patent/EP1970635A2/en
Publication of EP1970635A3 publication Critical patent/EP1970635A3/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
    • F24C15/325—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation electrically-heated

Definitions

  • the invention relates to a hot-air oven with a muffle and a fan chamber behind the muffle, wherein the fan chamber is separated from the muffle by a partition wall.
  • a fan and a heater are arranged in the fan room .
  • the partition wall is divided into an inner area radially inside the fan wheel and an outer area radially outside the fan wheel.
  • Intake openings are provided in the inner region through which the air passes from the muffle to the fan wheel.
  • exhaust openings are provided, as well as baffles for deflecting the air from the fan into the exhaust openings.
  • Such ovens allow to suck air from the muffle in the fan room, to heat there and then to re-direct into the muffle.
  • WO 2007/020584 and US 2006/0272632 describe devices in which deflecting arrangements are provided in the partition at the openings to redirect the air into the muffle into it.
  • WO 2009/074423 represents an older right to this property right.
  • Object of the present invention is to provide an oven of the type mentioned, in which the heat is well distributed in the muffle.
  • At least one blow-out opening and, associated with each blow-out opening, at least one deflection arrangement are provided in the dividing wall horizontally next to the inner area.
  • Each deflection arrangement comprises at least two baffle sections which are mutually aligned not parallel and inclined differently to the radial direction.
  • baffles are provided, which extend transversely to the partition wall and are arranged with respect to the direction of rotation of the fan in front of the exhaust openings.
  • the baffles have transverse to the partition to a greater extent than the baffles, so that the striking over the baffles air can get caught in the baffles.
  • radial and radial direction refer to the axis of rotation of the fan wheel.
  • partition according to the following description is divided into a “region radially inside the fan” and a “region radially outside the fan”. This is to be understood as meaning that the area radially within the fan wheel is the projection of the fan speed during its rotational movement interspersed space corresponds perpendicular to the partition, while the area is formed radially outside the fan from the rest of the partition.
  • the figures show the housing of the fan room 1 of a hot air oven. This housing forms the rear end of the muffle of the device, with in FIGS. 2 and 3 the side walls 2 of the muffle are partially visible.
  • the fan room 1 is closed at the back by a rear wall 3 and at the front by a partition wall 4.
  • Rear wall 3 and partition 4 are formed by preformed sheets, which are interconnected in its edge region 9.
  • a fan 5 is arranged, which is best in Fig. 4 and 5 is apparent.
  • the fan 5 is rotatable by a rotary drive about a perpendicular to the partition wall 4 rotating axis 6, wherein the direction of rotation 7 in Fig. 4 and 5 is drawn.
  • the partition may be divided into an inner region 10 radially inside the fan 5 and an outer region 11 radially outside the fan 5, see Fig. 1 ,
  • approximately annular suction openings 12 are provided in the partition wall 4, through which air is sucked from the rotating fan 5 of the muffle ago.
  • exhaust openings 13a - 13d are provided, through which the air is blown from the rotating fan 5 into the muffle.
  • a heater 14 of which the air, which was sucked by the muffle, heated in the fan room before it is blown back into the muffle.
  • baffles 16a - 16d are arranged, see in particular Fig. 4 and 5 , They serve to redirect the air coming from the fan 5 in the exhaust ports, and also reduce the swirl of the flow field in the fan chamber 1. They are each arranged with respect to the direction of rotation 7 of the fan immediately after the exhaust ports 13a - 13d arranged so that they Collect sweeping air through the exhaust openings and divert them into the respective exhaust opening. For this purpose, they are also arranged at least partially inclined, so that they are able to give the air flowing parallel to the partition wall 4 an impulse toward the muffle.
  • the deflecting plates 16a-16d are fastened to the dividing wall 4.
  • the Deflection plates 16a, 16b of the lateral exhaust openings 13a, 13b are made as separate parts which are welded to the partition wall 4, while it is at the baffles 16c, 16d of the lower and upper exhaust openings 13c, 13d to angled tongues of the sheet of the rear wall 4th is.
  • baffles 16a, 16b baffles 17a, 17b attached to the partition wall 4, which best from Fig. 5 can be seen. They extend transversely to the partition wall 4 and are arranged with respect to the direction of rotation 7 of the fan immediately before the exhaust ports 13a, 13b. Their task is to avoid a direct penetration of the partition wall 4 along sweeping air from the fan 5 in the exhaust ports 13a, 13b. Without them, a relatively strong, substantially parallel to the rear wall of the exhaust openings 13a, 13b emerging air flow generated in the muffle.
  • baffles 16a, 16b have a greater extension transversely to the partition wall 4 than the same outlet opening 13a and 13b associated baffles 17a and 17b, so that over the baffles 17a, 17b stroking air can get caught in the baffles 16a, 16b.
  • the baffles 17 a, 17 b are formed by angled tongues of the sheet of the rear wall 4.
  • the two side exhaust openings 13a, 13b have an elongated, curved, shape. In the present example, it is a V-shape, but, for example, a crescent shape is also conceivable, or several individual blow-off openings with associated deflection plates oriented differently from the radial direction may be provided.
  • the respective baffles 13a, 13b are each formed by a deflection arrangement which, for example, as shown in the figures, consists of a bent sheet metal or of a plurality of individual sheets.
  • Each deflection arrangement has two deflecting plate sections 18a1, 18a2, 18b1, 18b2 which are not parallel to one another and are inclined radially to one another, so that the air deflected at the corresponding deflecting section is deflected into a somewhat different solid angle and thus better distributed in the muffle.
  • the Umlenkblechabitese 18al, 18a2 or 18b1, 18b2 each deflection arrangement are each formed by two straight, at an angle to each other Umlenkblechabitesen, which is manufacturing technology relatively simple. Conceivable, however, are curved instead of straight baffle sections.
  • the embodiment described so far can be modified in various points.
  • the number and the exact arrangement of the exhaust openings 13a, 13b, 13c, 13d can be adapted to the respective requirements.
  • the exact orientation of the exhaust openings must also be adjusted depending on the respective requirements. In particular, it depends on the exact air flow geometry in the fan room 1, which in turn is a function of the geometry of the device and the fan wheel. It can be optimized experimentally, for example.
  • the curved elongated exhaust ports 13a, 13b are arranged so that they Vertex (ie, the tip of the "V” in the case of V-shaped openings) is arranged in the direction of rotation 7 in front of their legs, resulting in a better distribution of the air currents.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
  • Tunnel Furnaces (AREA)

Abstract

The oven has a fan chamber provided behind a muffle and separated from the muffle by a partition wall (4). A heater and a fan wheel (5) are arranged at the fan chamber, where the fan wheel is driven for rotating around a rotational axle (6) staying transverse to the partition wall. An exhaust opening (13c) and a deflection arrangement of a baffle plate are arranged horizontally adjacent to an inner area in the partition wall. The deflection arrangement has baffle plate sections (18a1, 18a2, 18b1, 18b2) that are inclined not parallel to each other and variably to a radial direction.

Description

Die Erfindung betrifft einen Heissluft-Backofen mit einer Muffel und einem Gebläseraum hinter der Muffel, wobei der Gebläseraum von der Muffel durch eine Trennwand getrennt ist. Im Gebläseraum sind ein Lüfterrad und eine Heizung angeordnet. Die Trennwand ist in einen inneren Bereich radial innerhalb des Lüfterrads und einen äusseren Bereich radial ausserhalb des Lüfterrades unterteilt. Im inneren Bereich sind Ansaugöffnungen vorgesehen, durch welche die Luft von der Muffel zum Lüfterrad gelangt. Im äusseren Bereich sind Ausblasöffnungen vorgesehen, sowie Umlenkbleche zum Ablenken der Luft vom Lüfterrad in die Ausblasöffnungen.The invention relates to a hot-air oven with a muffle and a fan chamber behind the muffle, wherein the fan chamber is separated from the muffle by a partition wall. In the fan room a fan and a heater are arranged. The partition wall is divided into an inner area radially inside the fan wheel and an outer area radially outside the fan wheel. Intake openings are provided in the inner region through which the air passes from the muffle to the fan wheel. In the outer area, exhaust openings are provided, as well as baffles for deflecting the air from the fan into the exhaust openings.

Derartige Backöfen erlauben es, Luft von der Muffel in den Gebläseraum einzusaugen, dort zu erwärmen und sodann wieder in die Muffel zu leiten.Such ovens allow to suck air from the muffle in the fan room, to heat there and then to re-direct into the muffle.

Dabei ist es wichtig, dass die Wärme in der Muffel möglichst gleichmässig verteilt wird. Insbesondere ist die Bildung von sogenannten "hot spots" möglichst zu vermeiden.It is important that the heat in the muffle is distributed as evenly as possible. In particular, the formation of so-called "hot spots" should be avoided as far as possible.

WO 2007/020584 und US 2006/0272632 beschreiben Geräte, bei welchen in der Trennwand bei den Öffnungen Umlenkanordnungen vorgesehen sind, um die Luft in die Muffel hinein umzuleiten. WO 2007/020584 and US 2006/0272632 describe devices in which deflecting arrangements are provided in the partition at the openings to redirect the air into the muffle into it.

WO 2009/074423 stellt ein älteres Recht zum vorliegenden Schutzrecht dar. WO 2009/074423 represents an older right to this property right.

Aufgabe der vorliegenden Erfindung ist es, einen Backofen der eingangs genannten Art bereitzustellen, bei welchem die Wärme gut in der Muffel verteilt wird.Object of the present invention is to provide an oven of the type mentioned, in which the heat is well distributed in the muffle.

Diese Aufgabe wird vom Backofen gemäss Anspruch 1 gelöst. Demgemäss sind in der Trennwand horizontal neben dem inneren Bereich mindestens eine Ausblasöffnung sowie, jeder Ausblasöffnung zugeordnet, mindestens eine Umlenkanordnung vorgesehen. Jede Umlenkanordnung umfasst mindestens zwei Umlenkblechabschnitte, welche zueinander nicht parallel verlaufen und unterschiedlich zur Radialrichtung geneigt sind. Dies führt dazu, dass die in diesem Bereich ungefähr tangential strömende Luft an den beiden Umlenkblechabschnitten in unterschiedliche Richtungen in die Muffel hinein abgelenkt wird. Es entstehen somit sozusagen also mindestens zwei nicht parallele Luftströme in die Muffel hinein, so dass die warme Luft besser verteilt und die Gefahr von sog. "hot spots" reduziert wird.This object is achieved by the oven according to claim 1. Accordingly, at least one blow-out opening and, associated with each blow-out opening, at least one deflection arrangement are provided in the dividing wall horizontally next to the inner area. Each deflection arrangement comprises at least two baffle sections which are mutually aligned not parallel and inclined differently to the radial direction. As a result, the approximately tangentially flowing air in this area is deflected in different directions into the muffle at the two deflector sections. Thus, so to speak, at least two non-parallel air flows emerge into the muffle, so that the warm air is better distributed and the danger of so-called "hot spots" is reduced.

Weiter sind Staubleche vorgesehen, welche sich quer zur Trennwand erstrecken und bezüglich der Umdrehungsrichtung des Lüfterrads vor den Ausblasöffnungen angeordnet sind. Die Umlenkbleche weisen quer zur Trennwand eine grössere Ausdehnung auf als die Staubleche, so dass die über die Staubleche streichende Luft sich in den Umlenkblechen verfangen kann.Further, baffles are provided, which extend transversely to the partition wall and are arranged with respect to the direction of rotation of the fan in front of the exhaust openings. The baffles have transverse to the partition to a greater extent than the baffles, so that the striking over the baffles air can get caught in the baffles.

Ohne die erfindungsgemässe Massnahme besteht insbesondere bei seitlich des Lüfterrads angeordneten Öffnungen die Gefahr, dass der Lufteintrag in die Muffel sehr ungleichmässig erfolgt.Without the measure according to the invention, there is the danger, in particular with openings arranged laterally of the fan wheel, that the air entry into the muffle takes place very unevenly.

Weitere bevorzugte Ausführungen der Erfindung ergeben sich aus den abhängigen Ansprüchen sowie aus der nun folgenden Beschreibung anhand der Figuren. Dabei zeigen:

  • Fig. 1 eine Ansicht des Gehäuses des Gebläseraums von vorne,
  • Fig. 2 die linke Hälfte des Gehäuses von Fig. 1 in teilweiser Schnittansicht,
  • Fig. 3 die rechte Hälfte des Gehäuses von Fig. 1 in teilweiser Schnittansicht,
  • Fig. 4 das Gehäuse von Fig. 1 von hinten ohne Rückwand und
  • Fig. 5 das Gehäuse von Fig. 4 aus etwas anderer Blickrichtung.
Further preferred embodiments of the invention will become apparent from the dependent claims and from the following description with reference to FIGS. Showing:
  • Fig. 1 a view of the housing of the fan room from the front,
  • Fig. 2 the left half of the case of Fig. 1 in partial sectional view,
  • Fig. 3 the right half of the case of Fig. 1 in partial sectional view,
  • Fig. 4 the case of Fig. 1 from behind without back wall and
  • Fig. 5 the case of Fig. 4 from a different perspective.

Begriffsdefinitionen:Definition of terms:

Begriffe der Art "vorne", "Vorderseite", "vor" sind so zu verstehen, dass darunter die der Backofentüre bzw. dem Benutzer zugewanden bzw. näheren Bereiche bzw. Richtungen zu verstehen sind, während Begriffe der Art "hinten", "Hinterseite", "Rückseite", "hinter" die von der Backofentüre bzw. vom Benutzer abgewandten bzw. entfernteren Bereiche bzw. Richtungen bezeichnen.Terms of the type "front", "front", "forward" are to be understood as including the oven door or the user zugewanden or closer areas or directions to understand, while terms of the kind "rear", "rear "," Back "," behind "denote facing away from the oven door or the user or more remote areas or directions.

Die Begriffe "radial" und "Radialrichtung" beziehen sich auf Drehachse des Lüfterrads.The terms "radial" and "radial direction" refer to the axis of rotation of the fan wheel.

Die "Trennwand" gemäss folgender Beschreibung wird in einen "Bereich radial innerhalb des Lüfterrads" und einen "Bereich radial ausserhalb des Lüfterrads" unterteilt. Dies ist so zu verstehen, dass der Bereich radial innerhalb des Lüfterrads der Projektion des vom Lüfterrated bei seiner Drehbewegung durchsetzten Raums senkrecht auf die Trennwand entspricht, während der Bereich radial ausserhalb des Lüfterrads vom Rest der Trennwand gebildet wird.The "partition" according to the following description is divided into a "region radially inside the fan" and a "region radially outside the fan". This is to be understood as meaning that the area radially within the fan wheel is the projection of the fan speed during its rotational movement interspersed space corresponds perpendicular to the partition, while the area is formed radially outside the fan from the rest of the partition.

Die Begriffe "horizontal" bzw. "vertikal" sowie "höher" und "tiefer" sind bei bestimmungsgemässer Anordnung des Backofens zu verstehen.The terms "horizontal" or "vertical" as well as "higher" and "lower" are to be understood when the oven is arranged as intended.

Beschreibung:Description:

Die Figuren zeigen das Gehäuse des Gebläseraums 1 eines Heissluft-Backofens. Dieses Gehäuse bildet den hinteren Abschluss der Muffel des Geräts, wobei in Fig. 2 und 3 die Seitenwände 2 der Muffel teilweise sichtbar sind.The figures show the housing of the fan room 1 of a hot air oven. This housing forms the rear end of the muffle of the device, with in FIGS. 2 and 3 the side walls 2 of the muffle are partially visible.

Der Gebläseraum 1 ist gegen hinten von einer Rückwand 3 und gegen vorne von einer Trennwand 4 abgeschlossen. Rückwand 3 und Trennwand 4 werden von vorgeformten Blechen gebildet, die in ihrem Randbereich 9 miteinander verbunden sind.The fan room 1 is closed at the back by a rear wall 3 and at the front by a partition wall 4. Rear wall 3 and partition 4 are formed by preformed sheets, which are interconnected in its edge region 9.

Im Gebläseraum 1 ist ein Lüfterrad 5 angeordnet, welches am besten in Fig. 4 und 5 ersichtlich ist. Das Lüfterrad 5 ist von einem Drehantrieb um eine senkrecht zur Trennwand 4 stehende Drehachse 6 drehbar, wobei der Drehsinn 7 in Fig. 4 und 5 eingezeichnet ist.In the fan room 1, a fan 5 is arranged, which is best in Fig. 4 and 5 is apparent. The fan 5 is rotatable by a rotary drive about a perpendicular to the partition wall 4 rotating axis 6, wherein the direction of rotation 7 in Fig. 4 and 5 is drawn.

Die Trennwand kann in einen inneren Bereich 10 radial innerhalb des Lüfterrads 5 und einen äusseren Bereich 11 radial ausserhalb des Lüfterrads 5 unterteilt werden, siehe Fig. 1. Im inneren Bereich 10 sind in der Trennwand 4 konzentrische, ungefähr ringförmige Ansaugöffnungen 12 vorgesehen, durch welche Luft vom sich drehenden Lüfterrad 5 von der Muffel her angesogen wird. Im äusseren Bereich 11 sind Ausblasöffnungen 13a - 13d vorgesehen, durch welche die Luft vom sich drehenden Lüfterrad 5 in die Muffel ausgeblasen wird.The partition may be divided into an inner region 10 radially inside the fan 5 and an outer region 11 radially outside the fan 5, see Fig. 1 , In the inner region 10 concentric, approximately annular suction openings 12 are provided in the partition wall 4, through which air is sucked from the rotating fan 5 of the muffle ago. In the outer region 11 exhaust openings 13a - 13d are provided, through which the air is blown from the rotating fan 5 into the muffle.

Um das Lüfterrad 5 herum ist (siehe Fig. 4, 5) eine Heizung 14 angeordnet, von welcher die Luft, welche von der Muffel angesogen wurde, im Gebläseraum erwärmt wird, bevor diese zurück in die Muffel geblasen wird.To the fan 5 is around (see Fig. 4 . 5 ) arranged a heater 14, of which the air, which was sucked by the muffle, heated in the fan room before it is blown back into the muffle.

Es sind verschiedene Arten von Ausblasöffnungen 13a - 13d vorgesehen:

  • In einem Bereich horizontal neben dem inneren Bereich 10 sind zwei Ausblasöffnungen 13a, 13b vorgesehen, welche im Folgenden als "seitliche Ausblasöffnungen" bezeichnet werden. Sie dienen dazu, Luft ungefähr auf halber Höhe der Muffel in diese einzuspeisen.
  • In einem unteren Teil des äusseren Bereichs 11, wo die Trennwand 4 zum Randbereich 9 hin abgeschrägt ist, ist eine Reihe von Ausblasöffnungen 13c vorgesehen, welche im Folgenden als "untere Ausblasöffnungen" bezeichnet werden. Sie dienen dazu, Luft in den unteren Bereich der Muffel zu blasen.
  • In einem oberen Teil des äusseren Bereichs 11, wo die Trennwand 4 ebenfalls zum Randbereich 9 hin abgeschrägt ist, ist eine Reihe von Ausblasöffnungen 13d vorgesehen, welche im Folgenden als "obere Ausblasöffnungen" bezeichnet werden. Sie dienen dazu, Luft in den oberen Bereich der Muffel zu blasen.
Various types of exhaust ports 13a-13d are provided:
  • In a region horizontally adjacent to the inner region 10, two exhaust openings 13a, 13b are provided, which are referred to below as "lateral exhaust openings". They serve to feed air approximately halfway up the muffle into them.
  • In a lower part of the outer area 11, where the partition wall 4 is chamfered towards the edge area 9, there are provided a series of blow-off openings 13c, which are referred to below as "lower blow-off openings". They serve to blow air into the lower area of the muffle.
  • In an upper part of the outer area 11, where the partition wall 4 is also chamfered towards the edge area 9, there is provided a series of blow-off openings 13d, which are referred to below as "upper blow-off openings". They serve to blow air into the upper area of the muffle.

Bei den Ausblasöffnungen 13a - 13d sind Umlenkbleche 16a - 16d angeordnet, siehe insbesondere Fig. 4 und 5. Sie dienen dazu, die vom Lüfterrad 5 kommende Luft in die Ausblasöffnungen umzulenken, und zudem reduzieren sie den Drall des Strömungsfeldes im Gebläseraum 1. Sie sind jeweils bezüglich der Umdrehungsrichtung 7 des Lüfterrads gesehen unmittelbar nach den Ausblasöffnungen 13a - 13d angeordnet, so dass sie die über die Ausblasöffnungen streichende Luft auffangen und in die jeweilige Ausblasöffnung hin umlenken. Zu diesem Zweck sind sie ausserdem mindestens teilweise geneigt angeordnet, so dass sie der parallel zur Trennwand 4 strömenden Luft einen Impuls in Richtung zur Muffel hin zu geben vermögen.In the exhaust ports 13a - 13d baffles 16a - 16d are arranged, see in particular Fig. 4 and 5 , They serve to redirect the air coming from the fan 5 in the exhaust ports, and also reduce the swirl of the flow field in the fan chamber 1. They are each arranged with respect to the direction of rotation 7 of the fan immediately after the exhaust ports 13a - 13d arranged so that they Collect sweeping air through the exhaust openings and divert them into the respective exhaust opening. For this purpose, they are also arranged at least partially inclined, so that they are able to give the air flowing parallel to the partition wall 4 an impulse toward the muffle.

In den gezeigten Ausführungen sind die Umlenkbleche 16a - 16d an der Trennwand 4 befestigt. Die Umlenkbleche 16a, 16b der seitlichen Ausblasöffnungen 13a, 13b sind dabei als separate Teile gefertigt, die mit der Trennwand 4 verschweisst sind, während es sich bei den Umlenkblechen 16c, 16d der unteren und oberen Ausblasöffnungen 13c, 13d um abgewinkelte Zungen des Blechs der Rückwand 4 handelt.In the embodiments shown, the deflecting plates 16a-16d are fastened to the dividing wall 4. The Deflection plates 16a, 16b of the lateral exhaust openings 13a, 13b are made as separate parts which are welded to the partition wall 4, while it is at the baffles 16c, 16d of the lower and upper exhaust openings 13c, 13d to angled tongues of the sheet of the rear wall 4th is.

Denkbar ist es allerdings auch, die Umlenkbleche nicht an der Trennwand 4, sondern an der Rückwand 3 zu befestigen.It is also conceivable, however, not to secure the baffles on the partition 4, but on the rear wall 3.

Weiter sind an der Trennwand 4 zumindest bei den seitlichen Ausblasöffnungen 13a, 13b zusätzlich zu den Umlenkblechen 16a, 16b Staubleche 17a, 17b befestigt, welche am besten aus Fig. 5 ersichtlich sind. Sie erstrecken sich quer zur Trennwand 4 und sind bezüglich der Umdrehungsrichtung 7 des Lüfterrads unmittelbar vor den Ausblasöffnungen 13a, 13b angeordnet. Ihre Aufgabe besteht darin, ein direktes Eindringen der der Trennwand 4 entlang streichenden Luft vom Lüfterrad 5 in die Ausblasöffnungen 13a, 13b zu vermeiden. Ohne sie würde in der Muffel ein relativ starker, praktisch parallel zur Rückwand aus den Ausblasöffnungen 13a, 13b austretender Luftstrom erzeugt.Further, at least at the side exhaust openings 13a, 13b in addition to the baffles 16a, 16b baffles 17a, 17b attached to the partition wall 4, which best from Fig. 5 can be seen. They extend transversely to the partition wall 4 and are arranged with respect to the direction of rotation 7 of the fan immediately before the exhaust ports 13a, 13b. Their task is to avoid a direct penetration of the partition wall 4 along sweeping air from the fan 5 in the exhaust ports 13a, 13b. Without them, a relatively strong, substantially parallel to the rear wall of the exhaust openings 13a, 13b emerging air flow generated in the muffle.

Die Umlenkbleche 16a, 16b haben eine grössere Ausdehnung quer zur Trennwand 4 als die der gleichen Ausblasöffnung 13a bzw. 13b zugeordneten Staubleche 17a bzw. 17b, so dass die über die Staubleche 17a, 17b streichende Luft sich in den Umlenkblechen 16a, 16b verfangen kann.The baffles 16a, 16b have a greater extension transversely to the partition wall 4 than the same outlet opening 13a and 13b associated baffles 17a and 17b, so that over the baffles 17a, 17b stroking air can get caught in the baffles 16a, 16b.

Die Staubleche 17a, 17b werden von abgewinkelten Zungen des Blechs der Rückwand 4 gebildet.The baffles 17 a, 17 b are formed by angled tongues of the sheet of the rear wall 4.

Die beiden seitlichen Ausblasöffnungen 13a, 13b besitzen eine längliche, gekrümmte, Form. Im vorliegenden Beispiel handelt es sich um eine V-Form, denkbar ist jedoch z.B. auch eine Sichelform, oder es können mehrere einzelne Ausblasöffnungen mit zugeordneten, unterschiedlich zur Radialrichtung orientierten Umlenkblechen vorgesehen sein.The two side exhaust openings 13a, 13b have an elongated, curved, shape. In the present example, it is a V-shape, but, for example, a crescent shape is also conceivable, or several individual blow-off openings with associated deflection plates oriented differently from the radial direction may be provided.

Die entsprechenden Umlenkbleche 13a, 13b werden jeweils von einer Umlenkanordnung gebildet, welche z.B., wie in den Figuren gezeigt, aus einem gebogenen Blech besteht, oder aus mehreren Einzelblechen. Jede Umlenkanordnung besitzt zwei zueinander nicht parallele, unterschiedlich zur Radialrichtung geneigte, radial hintereinander angeordnete Umlenkblechabschnitte 18a1, 18a2, 18b1, 18b2, so dass die an den entsprechenden Umlenkblechabschnitten umgelenkte Luft in jeweils etwas andere Raumwinkel abgelenkt und so in der Muffel besser verteilt wird.The respective baffles 13a, 13b are each formed by a deflection arrangement which, for example, as shown in the figures, consists of a bent sheet metal or of a plurality of individual sheets. Each deflection arrangement has two deflecting plate sections 18a1, 18a2, 18b1, 18b2 which are not parallel to one another and are inclined radially to one another, so that the air deflected at the corresponding deflecting section is deflected into a somewhat different solid angle and thus better distributed in the muffle.

In der gezeigten Ausführung werden die Umlenkblechabschnitte 18al, 18a2 bzw. 18b1, 18b2 jeder Umlenkanordnung jeweils von zwei geraden, unter einem Winkel zueinander verlaufenden Umlenkblechabschnitten gebildet, was herstellungstechnisch relativ einfach ist. Denkbar sind jedoch auch gekrümmte anstelle von geraden Umlenkblechabschnitten.In the embodiment shown, the Umlenkblechabschnitte 18al, 18a2 or 18b1, 18b2 each deflection arrangement are each formed by two straight, at an angle to each other Umlenkblechabschnitten, which is manufacturing technology relatively simple. Conceivable, however, are curved instead of straight baffle sections.

Die soweit beschriebene Ausführung kann in verschiedenen Punkten abgewandelt werden. Beispielsweise kann die Zahl und die genaue Anordnung der Ausblasöffnungen 13a, 13b, 13c, 13d den jeweiligen Anforderungen angepasst werden. Vorteilhaft ist es jedoch, zumindest beidseits des inneren Bereichs 10 auf gegenüber liegenden Seiten mindestens eine Ausblasöffnung vorzusehen, so dass der Mittelbereich der Muffel gut durchlüftet werden kann. Dies ist insbesondere dann wichtig, wenn in der Muffel z.B. zwei Kuchenbleche übereinander angeordnet werden sollen.The embodiment described so far can be modified in various points. For example, the number and the exact arrangement of the exhaust openings 13a, 13b, 13c, 13d can be adapted to the respective requirements. However, it is advantageous to provide at least one blow-off opening on at least two sides of the inner area 10 on opposite sides, so that the central area of the muffle can be well ventilated. This is particularly important when in the muffle e.g. two baking trays are to be arranged one above the other.

Die genaue Orientierung der Ausblasöffnungen ist ebenfalls abhängig von den jeweiligen Anforderungen anzupassen. Insbesondere hängt sie von der genauen Luftstromgeometrie im Gebläseraum 1 ab, welche ihrerseits eine Funktion der Geometrie des Geräts und des Lüfterrads ist. Sie kann z.B. experimentell optimiert werden. Vorzugsweise werden die gekrümmt verlaufenden, länglichen Ausblasöffnungen 13a, 13b jedoch so angeordnet, dass ihr Scheitelpunkt (d.h. die Spitze des "V" im Falle von V-förmigen Öffnungen) in Richtung der Drehrichtung 7 vor deren Schenkeln angeordnet ist, wodurch sich eine bessere Aufteilung der Luftströme ergibt.The exact orientation of the exhaust openings must also be adjusted depending on the respective requirements. In particular, it depends on the exact air flow geometry in the fan room 1, which in turn is a function of the geometry of the device and the fan wheel. It can be optimized experimentally, for example. Preferably, however, the curved elongated exhaust ports 13a, 13b are arranged so that they Vertex (ie, the tip of the "V" in the case of V-shaped openings) is arranged in the direction of rotation 7 in front of their legs, resulting in a better distribution of the air currents.

Claims (7)

  1. Fan-assisted oven with a muffle and a ventilation compartment (1) behind the muffle, wherein the ventilation compartment (1) is separated from the muffle by a separating wall (4), wherein a heating (14) and a fan impeller (5) are arranged inside the ventilation compartment (1), wherein the fan impeller (5) is actuated for rotating around a rotation axis (6) arranged transversally with respect to the separating wall (4), wherein at least a suction opening (12) for sucking air into the ventilation compartment (1) is provided in the separating wall (4) in an inner area (10) radially inside the fan impeller (5) and exhaust openings (13a - 13d) for exhausting air into the muffle are provided in an outer area (11) radially outside the fan impeller (5), wherein guide plates (16a, 16b) for deflecting the air from the fan impeller (5) into the exhaust openings (13a - 13d) are provided on the backside of the separating wall (4), wherein at least an exhaust opening (13a, 13b) as well as at least a guide arrangement composed of at least a guide plate (16a, 16b) are arranged in the separating wall (4) horizontally next to the inner area (10), wherein the guide plates (16a, 16b) are arranged after the exhaust openings (13a - 13d) with respect to the rotation direction of the fan impeller (5), wherein baffle plates (17a, 17b) are present additionally to the guide plates (16a, 16b) at least for a part of the exhaust openings (13a, 13b) which are arranged horizontally next to the inner area (10), wherein the guide plates (16a, 16b) have a higher extension transversally to the separating wall (4) than the baffle plates (17a, 17b) which extend transversally to the separating wall (4) and are arranged in front of the exhaust openings (13a, 13b) with respect to the rotation direction of the fan impeller (5), characterized in that each guide arrangement comprises at least two mutually non-parallel guide plate sections (18a1, 18a2, 18b1, 18b2) which are arranged differently slanted with respect to the radial direction and in that at least the exhaust openings (13a, 13b) situated horizontally next to the inner area (10) have an elongated, curved shape.
  2. Fan-assisted oven according to claim 1, wherein the baffle plates (17a, 17b) are attached to the separating wall (4).
  3. Fan-assisted oven according to one of the preceding claims, wherein the guide plates (16a, 16b) are attached to the separating wall (4).
  4. Fan-assisted oven according to one of the preceding claims, wherein at least the exhaust openings (13a, 13b) situated horizontally next to the inner area (10) have a V-shape.
  5. Fan-assisted oven according to one of the preceding claims, wherein at least a part of the guide arrangements comprise two guide plate sections (18a1, 18a2, 18b1, 18b2) arranged radially following one another, each straight and running in an angle with respect to one another.
  6. Fan-assisted oven according to one of the claims, wherein the outer area (11) has a bottom section which lies lower than the inner area (10), as well as a top section which lies higher than the inner area (10), wherein at least an exhaust opening (13c, 13d) with a guide plate (16c, 16d) is arranged in the top and/or the bottom section.
  7. Fan-assisted oven according to one of the preceding claims, wherein at least two exhaust openings (13a, 13b) with guide arrangements are arranged in the separating wall (4) horizontally next to the inner area (10), wherein the exhaust openings are arranged on opposite sides of the inner area (10).
EP08011554A 2008-06-26 2008-06-26 Hot air baking oven with baffle plates Not-in-force EP1970635B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT08011554T ATE550608T1 (en) 2008-06-26 2008-06-26 HOT AIR OVEN WITH DEFLECTOR PLATES
EP08011554A EP1970635B1 (en) 2008-06-26 2008-06-26 Hot air baking oven with baffle plates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08011554A EP1970635B1 (en) 2008-06-26 2008-06-26 Hot air baking oven with baffle plates

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EP1970635A2 EP1970635A2 (en) 2008-09-17
EP1970635A3 EP1970635A3 (en) 2009-02-18
EP1970635B1 true EP1970635B1 (en) 2012-03-21

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2370745B1 (en) * 2008-12-30 2016-09-07 Arçelik Anonim Sirketi An oven comprising a fan covering plate
JP5830685B2 (en) * 2010-01-18 2015-12-09 パナソニックＩｐマネジメント株式会社 Heating device
WO2012062679A1 (en) * 2010-11-12 2012-05-18 Arcelik Anonim Sirketi Forced convection oven
ES2405406B1 (en) * 2010-12-16 2014-05-13 BSH Electrodomésticos España S.A. Muffle for a cooking appliance, cooking appliance with a corresponding muffle, and procedure for performing a pyrolysis operation of a cooking appliance
FR2975470B1 (en) * 2011-05-19 2013-05-17 Fagorbrandt Sas COOKING OVEN COMPRISING A ZONE OF AN AIR CIRCULATION COMPARTMENT WITHOUT CIRCULATING AIR BY AT LEAST ONE FAN
CN102995367A (en) * 2011-09-09 2013-03-27 博西华电器（江苏）有限公司 Household appliance
WO2015165495A1 (en) * 2014-04-29 2015-11-05 Arcelik Anonim Sirketi Electric oven having an improved uniform heat distribution profile
EP3109558B1 (en) * 2015-06-24 2019-12-04 Electrolux Appliances Aktiebolag Convection heating device for a cooking oven
CN108245690A (en) * 2018-03-14 2018-07-06 广东美的厨房电器制造有限公司 Disinfection cabinet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060272632A1 (en) * 2005-06-01 2006-12-07 Maytag Corp. Airflow system for a convection oven
WO2009074423A2 (en) * 2007-12-12 2009-06-18 BSH Bosch und Siemens Hausgeräte GmbH Cooker-fan unit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2557867C3 (en) * 1975-12-22 1979-11-08 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Convection oven
AU8855482A (en) * 1981-10-02 1983-04-14 Gas & Fuel Corp. of Victoria Oven distributer unit
WO1983003658A1 (en) * 1982-04-14 1983-10-27 Kagomoto, Yoshiteru Hot air circulation type cooking device
AU575743B2 (en) * 1986-05-15 1988-08-04 Kabushiki Kaisha Toshiba Circulating air cooker
FR2623883B1 (en) * 1987-11-27 1991-05-10 Seb Sa ELECTRIC VENTILATION COOKING OVEN
US5485780A (en) * 1993-02-26 1996-01-23 Food Automation Service Techniques, Inc. Rotisserie oven
EP1793171A1 (en) * 2004-08-31 2007-06-06 Sharp Kabushiki Kaisha Heating cooking apparatus
WO2007020584A1 (en) 2005-08-12 2007-02-22 Arcelik Anonim Sirketi A cooking device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060272632A1 (en) * 2005-06-01 2006-12-07 Maytag Corp. Airflow system for a convection oven
WO2009074423A2 (en) * 2007-12-12 2009-06-18 BSH Bosch und Siemens Hausgeräte GmbH Cooker-fan unit

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Publication number Publication date
EP1970635A2 (en) 2008-09-17
EP1970635A3 (en) 2009-02-18
ATE550608T1 (en) 2012-04-15

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