EP0962708B1 - Cooking oven with flow guiding device - Google Patents

Description

The present invention relates to an oven having a baking chamber with a baking chamber opening, which is closed by a door, and with a cooling fan, the one Cooling air flow from an exhaust opening in the front area of the oven above the Baking chamber opening pushes into the open.

Such an oven is known from the document DE 37 41 975 A1, wherein the Cooking device is additionally operated with steam. Towards the end of the cooking phase is over a controllable steam outlet in the ceiling area of the oven muffle from the Stove steam to the suction side of a blower and simultaneously discharged via a controllable air supply opening from the pressure channel of the blower air the cooking chamber fed. In this way, the steam in the oven is so far reduced, that when opening the oven door no more annoying steam escapes. In particular is prevented when opening the door of a located in this area Operator pouring steam or vapor into his face. The disadvantage here is in particular the replacement of hot muffle air by cooling air and the associated Lowering the oven temperature before opening the oven door.

Object of the present invention is, in an oven according to the preamble of claim 1 with simple means when opening the door an influx of the To prevent operator from hot air.

This is according to the invention in an oven according to the preamble of claim 1 achieved in that in the region of the exhaust opening a flow guide is provided, which is activated or released by opening the door and the downwardly blown cooling air flow in the region of the baking chamber opening directed. When you open the door that is from the opening between the door and a the baking space opening moving muffle flange exiting upward hot Wrasenstrom directed a downwardly directed cooling air flow. Thereby the Wrasenstrom is deflected downward or pushed away by the operator.

Constructively particularly simple and optimally adjustable to the respective oven structure it is when the flow guide is movably mounted on the oven, and when opening the door from a rest position into a cooling flow deflecting downwards Operating position is adjustable. Montagetechnisch favorable, if the Cooling fan for blowing out the cooling air flow from the oven a blow-out shaft is assigned, in which the Strömungsleitmittel is held. Furthermore, by this Measure the flow guide held in the oven, without the front side Affect appearance. In addition, the function of the lube already before the final assembly of the blow-out shaft into the oven.

To ensure a safe operation of the arrangement according to the invention can, the oven has a door opening switch when opening the door an actuator controls that the flow guide moves to the operating position. Alternatively, the flow guide could also be biased into the operating position be, and the movement of the Strömungsleitmittels in the operating position by the Opening the door to be released.

According to a preferred embodiment, the air guiding means is immovable in the area arranged the exhaust opening. It directs the cooling air flow down and pushes him with the door closed in a front door open in the door Air duct. When the door is open, the downwards deflects out of the exhaust opening flowing cooling air flow the hot rising Wrasenstrom downwards away. This solution is particularly easy to implement because of the absence of moving parts.

Advantageously, the cooling fan always switches up to a higher power, when the door is opened when the oven is hot. A safe protection of the operator when opening the door is thereby ensured even in cases where the normal fan power, which is sufficient for cooling the oven is not sufficient here would be great.

The following are schematic representations of the prior art and described two embodiments of the oven according to the invention.

Fig. 1

in einer perspektivischen Darstellung einen Backofen nach dem Stand der Technik;

Fig. 2

stark schematisiert in einer Seitenansicht abschnittsweise den Backofen gemäß dem ersten Ausführungsbeispiel und

Fig. 3

in einer Darstellung entsprechend Fig. 2 den Backofen gemäß dem zweiten Ausführungsbeispiel.

Show it:

Fig. 1

in a perspective view of an oven according to the prior art;

Fig. 2

highly schematic in a side view sections of the oven according to the first embodiment and

Fig. 3

in a representation corresponding to FIG. 2, the oven according to the second embodiment.

In Fig. 1, a baking oven 1 according to the Prior art is shown. In one Housing 3 of the oven 1, a baking oven muffle 5 is supported, whose Loading opening on the front side by a oven door 7 is closed. Above the oven door 7 is on the housing 3, a front panel 9 with known per se Controls 11 and display elements 13 attached. In the housing 3 is above the oven muffle 5 a suction fan 15 is provided. This sucks Intake openings 17 of the housing 3 and, if necessary, by a Wrasenöffnung 19 in Ceiling area of the oven muffle 5 Cooling air or vapor. The suction fan 15th pushes the aspirated air-vapor mixture in a between the suction fan 15 and the front of the oven 1 extending Ausblasschacht 21. Der Ausblasschacht 21 has the front side substantially over the entire width of the Baking oven 1 exhaust openings 23, through which the mixture is transported to the outside (Fig. 1).

In the description of the first embodiment shown in FIG. 2 are off Simplification reasons, the Bezugsziffem of Fig. 1 taken as much as possible. In the blow-out shaft 21 above the oven muffle 5 is in the area of Blow-out opening over substantially the entire width of a spoiler 27th rotatably supported. The air deflector 27 is shown by a dotted Rest position adjustable to an operating position. In the rest position is the Louver 27 in a provided in the deck area of the blow-out shaft 21 Bag to the outflow of the cooling air flow with the door closed 7 not hinder. When the door 7 is closed (not shown), the cooling air flow from the Purging shaft 21 in an adjoining, horizontally extending Door channel 28 of the oven door 7 is pressed and can escape from the front. When opening the oven door 7 shown in FIG. 2 is a door pin 29 secured thereto of a in the Housing 3 salaried withdrawn known switch 31 deducted. By the release the switch is on the one hand via a control unit and an actuator (not shown) the air deflector 27 from above from the rest position by just over 90 ° in the Clockwise tilted obliquely forward to the operating position. Through this Measure the cooling air flow when opening the door 7 obliquely down the exiting Wrasenstrom oppositely (see flow arrows) and the Wrasenstrom also deflected down. At the same time when opening the door 7th by the switch 31 by bridging a limiting resistor the Suction fan 15 is switched up to a higher power.

In the second embodiment according to FIG. 3, the oven 1 above the Muffel 5 the blow-out shaft 21 in a modified form. At one essentially horizontally extending portion of the blowout shaft 21, a channel arch closes 41, in which the cooling air flow is guided downwards. With the door closed 7 (in 3), the channel arch 41 emits on the output side in a likewise curved extending air duct 43 which is arranged in the oven door 7. When opening the Door (not shown), the air duct 43 of the oven door 7 from the region of the channel arch 41 of the blow-out shaft 21 pulled. That's why the blown out Cooling air through a arranged in this area over substantially the entire width Guided air deflector 45, according to the first embodiment of the rising Wrasenstrom counter-downward.

Claims (6)

1. Baking oven with a baking chamber with a baking chamber opening, which is closable by a door, and with a cooling fan which forces a cooling air flow from an outflow opening in the front region of the baking oven above the baking chamber opening into the free atmosphere, characterised in that a flow guide means (27; 41) which is activated or freed by opening of the door (7) and which conducts the outflowing cooling air flow downwardly in the region of the baking chamber opening, is provided in the region of the outflow opening (23).
2. Baking oven according to claim 1, characterised in that the flow guide means (27) is mounted at the baking oven (1) to be movable and that on opening of the door (7) it is adjustable from a rest setting into an operational setting deflecting the cooling air flow.
3. Baking oven according to claim 2, characterised in that an outflow shaft (21) is associated with the cooling fan (15) for blowing the cooling air flow out of the baking oven (1) and that the flow guide means (27) is mounted in the outflow shaft (21).
4. Baking oven according to claim 2 or 3, characterised in that the baking oven (1) comprises a door opening switch (31) which on opening of the door (7) controls a setting element which moves the flow guide means (27) into the operational setting.
5. Baking oven according to claim 1, characterised in that the air guide means (41, 45) is arranged in the region of the outflow opening to be immovable and that the air guide means (41, 45) directs the cooling air flow downwardly and, when the door (7) is closed, forces the cooling air flow into an air channel (43) open at the front side and arranged in the door (7).
6. Baking oven according to one of the preceding claims, characterised in that the cooling fan (15) is switched up to a higher output when the door (7) is opened and the baking chamber (5) is hot.

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