WO2015110382A1

WO2015110382A1 - Cooking appliance

Info

Publication number: WO2015110382A1
Application number: PCT/EP2015/050877
Authority: WO
Inventors: Markus Kuchler; Helin WEINGARTNER; Markus De Vries
Original assignee: BSH Hausgeräte GmbH
Priority date: 2014-01-27
Filing date: 2015-01-19
Publication date: 2015-07-30
Also published as: DE102014201426A1

Abstract

The invention relates to a cooking appliance (1), in particular a microwave combination oven, comprising a magnetron (2) for generating microwaves, a muffle (4) for accepting items to be cooked, a door (5) for closing the muffle (4), an electrically conductive sealing device (8) between the muffle (4) and the door (5), and a microwave trap (10). The sealing device (8) is arranged upstream of the microwave trap (10) in a direction of propagation (A) of the microwaves.

Description

Cooking appliance

The present invention relates to a cooking appliance. The cooking appliance is in particular a household appliance. Cooking appliances such as ovens can have a door for closing a cooking chamber. The door can be sealed against a muffle of the oven by means of a seal. In this way, leakage of vapors from the oven can be prevented. In this way, on the one hand unwanted formation of steam and odor in the kitchen can be avoided and on the other hand can be prevented by preventing a significant volume flow from the oven to the outside that the cooking processes are disturbed in the oven. The door of microwave combination ovens should additionally meet the demand for good microwave sealing. Furthermore, in such combination devices, an increased temperature resistance of the sealing material may be required, which may be up to 300 ° C in the case of devices with pyrolytic self-cleaning.

DE 2 414 072 describes a door seal sleeve for combined microwave and self-cleaning cookers. It is described on its surface conductive sealing device which is conductively attached to a door of the cooking appliance. In the closed state of the door, the sealing device is electrically conductively contacted with a muffle flange of a muffle of the cooking device.

DE 28 48 658 A1 describes a microwave oven with a arranged between a muffle flange and a door sealing device which is enclosed by an electrically non-conductive glass fiber jacket. In the direction of propagation of the microwaves, a microwave trap is in each case arranged upstream of both the sealing device and also downstream of the sealing device.

Against this background, an object of the present invention is to provide an improved cooking appliance. Accordingly, a cooking appliance, in particular a microwave combination baking oven, proposed with a magnetron for generating microwaves, wherein the cooking appliance comprises a muffle for receiving food, a door for closing the muffle, arranged between the muffle and the door electrically conductive sealing means and a Includes microwave trap. In this case, the sealing device is arranged in a propagation direction of the microwaves in front of the microwave trap.

The muffle can also be referred to as a receiving area of the cooking appliance. In particular, the muffle has a cuboid shape. The muffle has a bottom, a cover arranged opposite the bottom, a rear wall arranged opposite the door, and two side walls arranged opposite one another. The muffle may in particular be made of a steel sheet. The fact that the microwave trap is arranged in the propagation direction of the microwaves after the sealing device, the door can be very compact. Preferably, both the microwave trap and the sealing device are provided on the door. The sealing device generates a pre-attenuation of the microwave radiation, while the particular geometrically defined microwave trap causes a subsequent attenuation. Due to the sequence of the pre-damping element, that is, the sealing device, and the Nachdämpfungselements, that is, the microwave trap, the microwave trap can be located far out on a door bottom of the door. As a result, a shorter overlap area between the door and muffle flange is possible in comparison to known cooking appliances. In a reverse arrangement, in which the microwave trap is arranged in the direction of propagation of the microwaves in front of the sealing device, the microwave attenuation range is significantly more extensive and the space required by the door becomes larger.

Due to the fact that the sealing device is designed to be electrically conductive, sparking is prevented to a carrier structure, that is to say to the structure on which the sealing device is arranged, such as the door or the muffle, or to adjacent conductive surfaces. In particular, it can be used to prevent sparking between the door bottom of the door, the sealing device and the muffle flange of the muffle. According to one embodiment, the sealing device is electrically conductively connected to the door or to a muffle flange of the muffle.

As a result, the occurrence of sparking can be further reduced. According to a further embodiment, the sealing device is electrically conductively connected to the door and the muffle flange is electrically insulated from the sealing device, in particular enamelled or painted.

The isolation of the Muffelflanschs relative to the sealing device is achieved in that a surface of the Muffelflanschs example, enamelled or painted.

According to a further embodiment, the sealing device is electrically conductively connected to the muffle flange and the door is electrically insulated from the sealing device, in particular enamelled or painted.

For electrical insulation of the door relative to the sealing device, the door is preferably provided with an enamel or lacquer layer.

According to a further embodiment, the sealing device is arranged in or on a groove provided on the door or on the muffle flange.

The groove preferably runs completely around the door or around the muffle flange. In particular, a groove can be provided both on the door and on the muffle flange. In this case, provided on the door groove and provided on the muffle groove are arranged opposite to each other.

According to a further embodiment, the groove has at least one locking hook, with the aid of which the sealing device can be fixed in or on the groove.

Preferably, the groove has a plurality of opposing pairs of locking hooks. The locking hooks are in particular materialeinstückig formed with a door bottom of the door or with the Muffelflansch. According to a further embodiment, the locking hooks are elastically deformable.

Preferably, the locking hooks are resilient. As a result, the sealing device can be resiliently fastened to or in the groove. The sealing device can be resiliently moved out of the groove and back into it by the resilient attachment with the locking hook. As a result, a reliable sealing of a gap provided between the door and the muffle flange is ensured, in particular with a slightly elastic sealing material.

According to a further embodiment, the sealing device has an anchor element with the aid of which the sealing device can be connected to the door. The sealing device may alternatively be connectable to the muffle flange by means of the anchor element. In particular, the anchor element is arranged in or on the sealing device. The anchor element may be a metal strip which is connected to a support structure, such as the door or the muffle flange by means of welds, screw or rivet joints. With the help of the anchor element, the sealing device is preferably electrically conductively connected to the door or to the muffle flange.

According to a further embodiment, a spring device is provided by means of which the sealing device is resiliently connected to the door. Alternatively, the sealing device can be resiliently connected to the muffle flange with the aid of the spring device.

In particular, a plurality of such spring devices is provided. With the help of the spring means a reliable gap sealing of the gap between the muffle flange and the door is always guaranteed. According to a further embodiment, the sealing device is electrically conductively connected to the door with the aid of the spring device. Alternatively, the sealing device is electrically conductively connected to the muffle flange with the aid of the spring device. The spring device is arranged in particular in the groove. The groove may be provided in or on the door or in or on the muffle flange. The spring device can be an integral part of the sealing device. According to a further embodiment, the sealing device completely revolves around the muffle flange.

As a result, a reliable sealing of the cooking chamber is ensured. According to a further embodiment, the sealing device is elastically deformable.

Preferably, the sealing device is elastically deformable. The sealing device may, for example, have a tubular fiberglass jacket in which electrically conductive wires are embedded. Alternatively, the sealing device may for example be made of a tubular metal mesh. The tubular structure of the sealing device may for example be filled with a further material. The further material may be, for example, a silicone material.

According to another embodiment, the microwave trap is a quarter-wave trap.

As a result, a reliable post-damping is guaranteed.

According to a further embodiment, at least one surface of the sealing device is electrically conductive.

This reliably prevents sparking between the sealing device, the door and / or the muffle flange. According to a further embodiment, the sealing device is resistant to high temperatures.

By "high temperature" herein is meant a temperature of 300 ° C up to 500 ° C. Further possible implementations of the invention also include not explicitly mentioned combinations of features or embodiments described above or below with regard to the exemplary embodiments. The skilled person will also add individual aspects as improvements or additions to the respective basic form of the invention.

Further advantageous embodiments and aspects of the invention are the subject of the dependent claims and the embodiments of the invention described below. Furthermore, the invention will be explained in more detail by means of preferred embodiments with reference to the attached figures.

Fig. 1 shows a schematic perspective view of an embodiment of a cooking appliance; FIG. 2 shows a schematic partial sectional view of a further embodiment of the cooking appliance according to FIG. 1; FIG.

FIG. 3 shows a further schematic partial sectional view of the embodiment of the cooking appliance according to FIG. 2; FIG.

4 shows a schematic partial sectional view of a further embodiment of the cooking appliance according to FIG. 1;

FIG. 5 shows a further schematic partial sectional view of the embodiment of the cooking appliance according to FIG. 4; FIG.

FIG. 6 shows a schematic partial sectional view of a further embodiment of the cooking appliance according to FIG. 1; FIG. FIG. 7 shows a schematic partial sectional view of a further embodiment of the cooking appliance according to FIG. 1; FIG. FIG. 8 shows a schematic partial sectional view of a further embodiment of the cooking appliance according to FIG. 1; FIG. and

9 shows a further schematic partial sectional view of the embodiment of the cooking appliance according to FIG. 8.

In the figures, the same or functionally identical elements have been given the same reference numerals, unless stated otherwise.

FIG. 1 shows a schematic perspective view of a cooking device 1. The cooking appliance 1 has a magnetron 2 for generating microwaves. The cooking appliance 1 further has a cooking chamber 3, which is enclosed by a muffle 4 of the cooking appliance 1, and a door 5 for closing the cooking chamber 3. The muffle 4 has in particular a cuboid geometry. In the orientation of FIG. 1, a muffle flange 6 of the muffle 4 is provided on the front side. The door 5 may be pivotally mounted on the muffle flange 6. The cooking appliance 1 is preferably a household appliance. In particular, the cooking appliance 1 is a microwave combination baking oven.

FIGS. 2 and 3 each show schematic detail sectional views of the cooking appliance 1. The door 5 preferably has a door bottom 7, which is made in particular of a metal sheet on. Between the muffle 4, in particular between the muffle flange 6, and the door 5, an electrically conductive sealing device 8 is provided. Preferably, at least one surface 9 of the sealing device 8 is electrically conductive. The sealing device 8 is preferably resistant to high temperatures. By "high temperature resistant" are meant temperatures of 300 ° C up to 500 ° C in the present case.

The sealing device 8 may be, for example, a glass fiber fabric tube, are woven into the conductive fibers. Furthermore, the sealing device 8 may be a metal mesh tube. The sealing device 8 may be formed as a tubular hollow body. Furthermore, the tubular hollow body may be filled, for example, with a silicone material. The sealing device 8 is in particular elastically deformable. That is, when the sealing device 8 is compressed, it undergoes a reversible change in geometry. In particular, the sealing device 8 elastic properties on. That is, after deforming the sealing device 8, it automatically springs back to its original shape.

The cooking appliance 1 further has a microwave trap 10, which is in particular adapted to prevent the escape of microwaves from the cooking chamber 3. The microwave trap 10 is in particular a so-called lambda quarter trap. The door 5 may comprise the microwave trap 10. Alternatively, the microwave trap 10 may be provided on the muffle flange 6.

The sealing device 8 is arranged in a propagation direction A of the microwaves in front of the microwave trap 10. The sealing device 8 thus forms a pre-damping zone

1 1 and the microwave trap 10 forms a post-attenuation zone 12. The sealing device 8 is preferably electrically conductively connected to the door 5. Alternatively, the

Sealing device 8 be electrically connected to the muffle 6.

In particular, the sealing device 8 is arranged in or on a groove 5 provided on the door groove 13. Alternatively, the groove 13 may be provided on the muffle flange 6. The

Sealing device 8 preferably completely surrounds the muffle flange 6.

In particular, the groove 13 rotates completely around the muffle flange 6.

2 shows the sealing device 8 in an unloaded state. That is, the door 5 is open or not completely closed. FIG. 3 shows the sealing device 8 in a loaded state, in which the muffle flange 6 rests against the sealing device 8. Fig. 3 shows the door 5 in a closed state. In this case, the sealing device 8 is elastically deformed. In particular, the sealing device 8, as described above, resilient properties, whereby always a good system of the sealing device 8 is ensured on the muffle 6. Between the door 5 and the muffle 6, a gap S is provided. The sealing device 8 can protrude into the gap S.

The sealing device 8 is preferably electrically conductively connected to the door 5. The muffle flange 6 is electrically insulated from the sealing device 8. For electrical insulation of the muffle flange 6, this can be enamelled or painted, for example. In an alternative embodiment of the cooking appliance 1, the sealing device 8 is electrically conductively connected to the muffle flange 6, the door 5 being electrically insulated from the sealing device 8. The door 5 may in this embodiment in particular enamelled or painted. In a further embodiment of the cooking appliance 1, the door bottom 7 may be made of stainless steel, wherein the sealing device 8 is electrically conductively connected to the metallic bare door bottom 7. The muffle flange 6 opposite the door 5 is preferably enamelled in this embodiment of the cooking appliance 1 and is not electrically conductive on its surface.

FIGS. 4 and 5 show a development of the cooking appliance 1 according to FIGS. 1-3. In particular, at least one locking hook 14, 15 is provided on the groove 13. Preferably, two locking hooks 14, 15 are arranged opposite each other. On the groove 13, a plurality of such oppositely arranged pairs of locking hooks 14, 15 may be provided. With the help of the locking hooks 14, 15, the sealing device 8 can be fixed in or on the groove 13. The locking hooks 14, 15 are preferably elastically deformable. In particular, the locking hooks 14, 15 are integrally formed with the door bottom 7 of the door 5. The locking hooks 14, 15 are preferably resiliently deformable. Alternatively, the locking hooks 14, 15 may be provided on the muffle flange 6.

4 shows the sealing device 8 in an unmounted state. The sealing device 8 is pressed in a mounting direction M in the groove 13. In this case, as shown in FIG. 5, the locking hooks 14, 15 engage in the elastically deformable sealing device 8, as a result of which it is captively fixed in or on the groove 13. With the help of the locking hooks 14, 15 a permanent electrical contact of the sealing device 8 with the door 5 is ensured. Since the locking hooks 14, 15 preferably have elastic properties, these support the sealing device 8 in the gap sealing between the door 5 and the muffle flange 6. This is particularly advantageous in one embodiment of the sealing device 8 with less elastic properties. That is, the locking hooks 14, 15 are adapted to support a resilient movement of the sealing device 8 out of the groove 13 and back into the groove 13. FIG. 6 shows a further embodiment of the cooking appliance 1. The sealing device 8 of the cooking appliance 1 according to FIG. 6 preferably has an anchor element 16 with the aid of which the sealing device 8 can be connected to the door 5 or alternatively to the muffle flange 6. The anchor member 16 may, for example, a on or in the Seal 8 be arranged sheet metal strip. In particular, the anchor element 16 faces away from the gap 5 provided between the door 5 and the muffle flange 6. The anchor element 16 may be connected by means of screws, rivets or a welded connection to the door 5, in particular to the door bottom 7, or to the muffle flange 6. In this embodiment of the cooking appliance 1, the sealing device 8 is in particular elastic enough to reliably seal the gap S between the door 5 and the muffle flange 6.

FIG. 7 shows a further embodiment of the cooking appliance 1. The sealing device 8 may have a spring device 17 which is attached to or in the groove 13. The spring device 17 is preferably fixedly connected to the sealing device 8. For this purpose, an anchor element 16 can be provided on or in the sealing device 8, which is connected to the spring device 17. The spring device 17 is configured so that the sealing device 8 is displaceable into the groove 13 or displaced out of it. A possible mobility of the sealing device 8 is shown in FIG. 7 by means of a double arrow. In this embodiment of the cooking appliance 1, the sealing device 8 may be largely inflexible. Sufficient gap sealing of the gap S can take place via the spring device 17.

In a further embodiment of the cooking appliance 1, the sealing device 8 is resiliently connected to the muffle flange 6 by means of the spring device 17. Preferably, the sealing device 8 is electrically conductively connected by means of the spring device 17 to the door 5 or to the muffle flange 6.

FIGS. 8 and 9 show a development of the cooking appliance 1. The embodiment of the cooking appliance 1 according to FIGS. 8 and 9 differs from the embodiment of the cooking appliance 1 according to FIGS. 2 and 3 only in that a groove 18 of the door 5 arranged opposite the groove 18 is provided on the muffle flange 6. Fig. 8 shows the sealing device 8 in an unloaded, Fig. 9 shows the sealing device 8 in a loaded state.

Although the present invention has been described with reference to embodiments, it is variously modifiable. Used reference signs:

1 cooking appliance

2 magnetrons

3 cooking space

4 muffles

5 door

6 muffle flange

7 door floor

8 sealing device

9 surface

10 microwave trap

1 1 pre-damping zone

12 post-damping zone

13 groove

14 locking hooks

15 locking hooks

16 anchor element

17 spring device

18 groove

A direction of propagation M mounting direction S gap

Claims

1 . Cooking appliance (1), in particular microwave combination oven, with a magnetron (2) for generating microwaves, wherein the cooking appliance (1) has a muffle (4) for

Receiving food to be cooked, a door (5) for closing the muffle (4), an electrically conductive sealing device (8) arranged between the muffle (4) and the door (5) and a microwave trap (10), the sealing device (8 ) is arranged in a propagation direction (A) of the microwaves in front of the microwave trap (10).

2. Cooking appliance according to claim 1, characterized in that the sealing device (8) is electrically conductively connected to the door (5) or with a muffle flange (6) of the muffle (4).

3. Cooking appliance according to claim 2, characterized in that the sealing device (8) is electrically conductively connected to the door (5) and that the muffle flange (6) relative to the sealing device (8) is electrically insulated, in particular enamelled or painted.

4. Cooking appliance according to claim 2, characterized in that the sealing device (8) is electrically conductively connected to the muffle flange (6) and that the door (5) relative to the sealing device (8) is electrically insulated, in particular enamelled or painted.

5. Cooking appliance according to one of claims 2-4, characterized in that the sealing device (8) in or on one of the door (5) or on the muffle flange (6) provided groove (13) is arranged.

6. Cooking appliance according to claim 5, characterized in that the groove (13) has at least one locking hook (14, 15), by means of which the sealing means (8) in or on the groove (13) is fixable.

7. Cooking appliance according to claim 6, characterized in that the locking hooks (14, 15) are elastically deformable.

8. Cooking appliance according to one of claims 2 - 7, characterized in that the

Sealing device (8) has an anchor element (16), by means of which the sealing device (8) with the door (5) or the Muffelflansch (6) is connectable.

9. Cooking appliance according to one of claims 2-8, characterized by a

Spring device (17) by means of which the sealing device (8) is resiliently connected to the door (5) or to the muffle flange (6).

10. cooking appliance according to claim 9, characterized in that the sealing device (8) by means of the spring means (17) with the door (5) or with the muffle flange (6) is electrically connected.

1 1. Cooking appliance according to one of claims 2 - 10, characterized in that the sealing device (8) completely revolves around the muffle flange (6).

12. Cooking appliance according to one of claims 1 - 1 1, characterized in that the sealing device (8) is elastically deformable.

13. Cooking appliance according to one of claims 1 - 12, characterized in that the microwave trap (10) is a quarter-wave trap.

14. Cooking appliance according to one of claims 1 - 13, characterized in that at least one surface (9) of the sealing device (8) is electrically conductive.

15. Cooking appliance according to one of claims 1-14, characterized in that the sealing device (8) is high temperature resistant.