EP2430368B1 - Door comprising a support element - Google Patents

Description

The invention relates to a door for a household appliance.

A door of a baking oven for closing a cooking chamber usually has at least two heat-resistant panes, one facing the cooking space and one forming the front of the door. The discs are held in different forms with metal or plastic profiles at a distance and form a unity with the hinges and various closure strips. The doors usually have a window for viewing the oven. This area, as well as all other parts of the door, it is measured by the temperature in the oven, for the user to keep relatively cold. For this purpose, disc packages with several, partially coated glasses are used. It can also be provided to ventilate the door and thus dissipate the excess heat. This method, as well as the heat conduction of the components with each other sometimes show a high heat loss and high energy consumption.

In addition, from the DE 197 48 196 A1 a door for an oven is known, which has a multi-part frame made of plastic. The frame serves as a support for the two or three panes of the door. The multi-part frame has a U-shaped part, which can be assembled by another rectilinear part of the square frame.

DE 195 23 876 A1 represents the closest prior art.

It is an object of the present invention to provide a support member for a door of a domestic appliance, which ensures a high thermal insulation and is also designed to be multifunctional.

Lens package is arranged. Below the lens package, the thermal insulation on a rear recess, in which a hot air blower is positioned.

From the WO 2006/120082 A1 is a door known for a household appliance. The door panel is formed as a filled with a foamed polymeric material hollow body.

In addition, from the EP 0 892 586 A2 a microwave oven with a door known.

It is an object of the present invention to provide a door for a domestic appliance, which ensures a high thermal insulation and is also designed to be multifunctional.

This object is achieved by a door having the features of claim 1.

A door according to the invention for a household appliance comprises a carrier element or an advantageous embodiment thereof, wherein the door is designed to close a heatable receiving space of the domestic appliance.

In this case, the carrier element is connected to the receiving space facing side with a plate-like cover, which has a sealing element, by means of which a moisture seal is formed to the receiving space and a thermal decoupling of the receiving space closer than a first visor lying second lens from the other component of the door is trained.

An inventive support member for a door of a domestic appliance is plate-like and at least partially designed from a material having a low specific thermal conductivity. The carrier element is also designed to accommodate at least one further functional unit of the domestic appliance. The support member is thus designed relatively flat by the plate-like design and ensures by the specific choice of materials a high thermal insulation and also serves additionally as a support for a functional unit of the domestic appliance.

In this case, the heat-insulating material of the carrier element has a specific thermal conductivity of less than or equal to 55 Jm ^-1 s ^-1 K ^-1 . In particular, the heat-insulating material has a specific thermal conductivity between 15 and 35 Jm ^-1 s ^-1 K ^-1 . Such relatively poorly heat-conductive materials make it possible for the door to be thermally exposed to the outside as little as possible so that the risk of injury to the user with regard to combustion or the like can at least be significantly reduced.

As a result of such carrier elements, a thermal decoupling of viewing windows, which are associated with the door and adjacent to the door, can also take place Carrier elements are arranged. In particular, the outside temperature of the windscreen can be significantly reduced.

It proves to be particularly advantageous if the heat-insulating material is a foamed plastic. In addition to an extremely low weight can still be achieved a high mechanical stability and dimensional stability in the temperature. Last but not least, the stability can also be generated in such a way that a large number of units and components can be arranged on the carrier element and can be carried. In addition, an embodiment of a foamed plastic manufacturing technology with regard to the shaping individually and precisely adjusted, so that even in this point highest precision and tolerance requirements can be met.

The heat-insulating material of the carrier element may preferably comprise polymers and / or ceramic materials. These are characterized by a particularly low thermal conductivity. For example, polytetrafluoroethylene (PTFE) has a specific thermal conductivity λ of 0.24 Jm ^-1 s ^-1 K ^-1 . In contrast, metallic components, for example, have thermal conductivities λ which are many times greater than those of PTFE. A material which has a low or low specific thermal conductivity is thus understood in particular to be one which has such a specific thermal conductivity quotient λ which is less than or equal to 55 Jm ^-1 s ^-1 K ^-1 .

Preferably, the heat-insulating material of the support member also has other properties, which set in terms of scratch resistance, sufficient chemical resistance, color fastness and temperature resistance up to temperatures of 500 ° C. Especially in household appliances for preparing food, such as an oven, which is also formed with a pyrolysis, occur in the cooking chamber inside temperatures up to around 500 ° C. Just there there is thus also a relatively high temperature exposure of the door, which can be withstood by a specific heat-insulating material of the support element and these high temperatures and low wear occurs.

Thermosetting and thermoplastic plastic or plastic composite materials, such as, for example, melamine resins, polyester resins, polyurethanes and the like, may also be provided as heat-insulating materials for the support. The situation-specific required temperature resistance of the carrier material is different depending on the size of the carrier element and the cooking chamber opening.

Heat-insulating materials that are temperature resistant up to temperatures of 500 ° C, for example, polyimides and PTFE.

Received from the carrier element or arranged on the carrier element, for example, a ventilation duct for the targeted heat regulation of components and hot areas of the door and / or another structural unit of the domestic appliance may be. A functional unit may also be an electronic component, wherein in this context, in particular, an operating unit and / or a display unit of the domestic appliance is provided. It is thus possible that the operating element and / or a Display unit are arranged on this specific support element. On the one hand, an embodiment can thus be ensured in which these components are arranged in the door and, moreover, they are protected against undesired temperature exposure.

A functional component may also be a cooling fan. Moreover, it is possible for a functional unit to be a lighting device for illuminating a receiving space of the household appliance, in particular a cooking chamber of a baking oven, which can be closed by the door. A functional unit can thus be designed differently, wherein the carrier element can also have a plurality of these specific functional units.

In addition, it can be provided that the support element is formed in addition to the possibility of receiving a functional unit as a support for at least one, in particular at least two, slices of the door. The discs may be formed as inner discs and as windscreens and optionally as washers. It may also be provided that disk packages are provided, of which at least one is coated in order to achieve a heat reflection can.

The carrier element has at least one continuous recess on or in which a functional unit is arranged. The functional unit may be formed integrally in the carrier element. It may also be provided a non-destructive releasable connection of the functional unit to the support member in the recess or at the recess. Especially for assembly or cleaning or replacement purposes can thus be a replacement of the functional unit, without the rest of the support member would also have to be replaced.

A plurality of recesses is provided in the support element, which are formed with each other, wherein a top and a bottom recess for receiving at least one functional unit are formed and in a central recess at least a first lens, in particular a lens package, the door can be positioned. Such a configuration thus enables the multiple inclusion of functional units and sealing washers, so that here too compact design can still be achieved while still optimally heat dissipation.

Preferably, the carrier element is integrally formed.

In addition to the high mechanical stability, the fast production can also be done by the fast assembly, which can also be made possible without tolerance.

The plate-like cover may preferably also have a moisture drip area, so that in this regard, the resulting moisture can be selectively dissipated and collected during operation of the domestic appliance.

Preferably, the plate-like cover made of plastic or metal, in particular stainless steel, is formed.

The carrier element is preferably realized as a quadrangular plate with continuous recesses for the functional units and / or at least one viewing window. Preferably, the plate-like support member has a quadrangular shape, wherein the dimensions is less than or equal to a windscreen in the door.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features mentioned above in the description and Feature combinations, as well as the features and feature combinations mentioned in the description of the figures and / or the features and combinations of features shown alone in the figures can be used not only in the combination indicated, but also in other combinations or alone, without departing from the scope of the invention , Illustrated embodiments can thus be combined in individual features or combinations of features to new, unspecified embodiments.

An embodiment of the invention will be explained in more detail with reference to a schematic drawing.

The single figure shows an exploded view of an embodiment of a door according to the invention with an embodiment of a support element according to the invention. The door 1 is provided for closing a cooking chamber of a baking oven, not shown. The door 1 comprises a windshield 2 with a viewing window 3. At the front 4 of the windscreen 2, a door handle 5 is formed. This is positioned above the viewing window 3.

In addition, the door 1 comprises a plate-like integrally formed carrier element 6, which is formed completely from a heat-insulating material. The heat-insulating material is a foamed plastic which has a specific thermal conductivity of less than or equal to 55 Jm ^-1 s ^-1 K ^-1 , in particular between 15 and 35 Jm ^-1 s ^-1 K ^-1 . The one-piece support element 6 has a quadrangular shape. In addition, three continuous recesses 7, 8 and 9 are formed in the support member 6 in the embodiment. The recesses 7 to 9 are formed in the y-direction one above the other and spaced from one another, wherein they extend in the x-direction substantially over the same width. All three recesses 7 to 9 are square, wherein the uppermost recess 7 and the lowermost recess 9 are formed as a rectangular shaft. The support member 6 is formed in addition to its functionality for thermal insulation and thermal decoupling of the windshield 2 of the arranged behind the support member 6 further components for receiving functional units of the oven. The functional units are arranged in particular in the recesses 7 and 9. A functional unit which may be arranged in the uppermost recess 7 is, for example, a control unit and / or a display unit, by means of which the domestic appliance is operated or information can be displayed to a user. It can also be provided that a lighting device for illuminating the cooking chamber is arranged in the uppermost receptacle 7.

In the lowermost recess 9 may be a ventilation duct for targeted heat regulation of components and hot areas of the door 1 and / or another unit of the oven as a functional unit. The ventilation duct can be integrated in the carrier element 6. It can also be provided that a cooling fan is arranged or integrated as a functional unit in the lowermost recess 9. The functional units can be arranged in the support member 6 in the respective or on the respective recesses 7 or 9 in addition to an integral embodiment in the support member 6 and non-destructively detachable. In the middle recess 8, a first lens package 10 can be positioned. This first lens package 10 preferably comprises at least two separate panes, wherein at least one of these panes is preferably coated with a heat-reflecting coating. As a result, the heat radiation emerging from the cooking chamber can be reflected back again at this coated first lens package 10 and the unwanted temperature exposure of the windshield 2 can be avoided.

The support member 6 may additionally have a hinge 11 and on the opposite side a non-visible and unspecified further hinge. The hinges 11 may also be integrally formed in the support member 6.

The plate-like support element 6 has in the x-y plane dimensions which are slightly smaller than the dimensions of the windscreen 2.

The door 1 further comprises a plate-like cover 12, which is arranged on the back of the carrier element 6 facing the cooking chamber and is connected to this carrier element 6. This creates a composite system. The plate-like cover 12 may be formed of a plastic or metal and is in particular also integrally formed. The plate-like cover 12 also has a central continuous recess 13, which for receiving Viewing windows, in particular lens packages, is formed. In addition, the cover has a Wasserabtropfbereich 14, by means of which it is ensured that incurred during operation of the oven water flow and can be collected. Furthermore, a circumferential sealing element 15 is formed on the peripheral side of the cover 12. By this sealing element 15, a moisture seal of the cooking chamber can be formed to the outside and beyond a thermal decoupling of a second lens package 16, which is closer to the cooking chamber than the first lens package 10 can be achieved. The thermal decoupling of this second lens package 16 takes place in this connection with respect to other components of the door 1. An undesirable temperature exposure, in particular of the windscreen 2 can be avoided. Due to the design of the door, in particular the carrier element 6 and its positioning can be made possible that occurring during operation temperature in the oven, which can range up to 300 ° C in normal operation and can range up to 500 ° C in a pyrolysis, not until passes outside and accordingly does not occur on the windscreen 2. In particular, by the support member 6 may be possible in this context that occur on the outside 4 of the windscreen 2 temperatures of 40 ° C maximum. The support member 6 is thus formed in particular according to its multifunctional design for receiving functional units and also ensures an excellent heat-insulating effect.

Thus, a door structure is made possible, which comprises the carrier element 6 as an essential component. In particular, the second lens package 16 may be thermally decoupled so that it may be very hot itself, but at the joints, the heat transfer can be kept very low, so that other components of the door 1 are no longer subjected to high temperatures. The composite system comprising the carrier element 6 and the plate-like cover 12. With regard to the mechanical connection of these two parts, a screw connection or a latching or also an adhesive bond is provided.

Of course, a lighting device may also be arranged in the lowermost recess 9 of the carrier element 6 or at this lowermost recess 9.

LIST OF REFERENCE NUMBERS

1

door

2

windscreen

3

window

4

front

5

door handle

6

support element

7, 8, 9

recesses

10

first lens package

11

hinge

12

cover

13

recess

14

Wasserabtropfbereich

15

sealing element

16

second lens package

Claims (11)

1. Door (1) for a domestic appliance, wherein the door (1) is embodied to close a receiving zone of the domestic appliance which can be applied with heat, having a support element (6), which is embodied in a plate-like manner and at least in regions from a material with a specific thermal conductivity of less than or equal to 55 Jm ^-1 s ^-1 K ^-1, and which is embodied to receive at least one functional unit of the domestic appliance, and has at least one continuous recess (7, 8, 9), on or in which a functional unit is arranged, wherein a plurality of recesses (7, 8, 9) is provided, which are embodied one below the other, wherein a topmost (7) and a lowermost recess (9) is embodied to receive at least one functional unit in each case, and at least one first window, in particular a window package (10), of the door (1) can be positioned in a central recess (8), characterised in that on the side facing the receiving zone the support element (6) is connected to a plate-like cover (12), which has a sealing element (15), by means of which a moisture-proofing of the receiving zone is embodied and a thermal decoupling of a second window (16) of the door (1) from other components of the door (1) is embodied, said second window (16) of the door (1) being disposed closer to the receiving zone than a first window (10).
2. Door (1) according to claim 1, characterised in that the heat-insulating material of the support element (6) has a specific thermal conductivity between 15 and 35 Jm ^-1 s ^-1 K ^-1 .
3. Door (1) according to claim 1 or 2, characterised in that the heat-insulating material is a foamed plastic.
4. Door (1) according to one of the preceding claims, characterised in that the heat-insulating material has polymers and/or ceramic materials.
5. Door (1) according to one of the preceding claims, characterised in that a functional unit is an air duct for the targeted heat regulation of components and hot areas of the door (1) and/or another unit of the domestic appliance.
6. Door (1) according to one of the preceding claims, characterised in that a functional unit is an electronic component, in particular a control unit and/or a display unit.
7. Door (1) according to one of the preceding claims, characterised in that a functional unit is a cooling fan.
8. Door (1) according to one of the preceding claims, characterised in that a functional unit is a lighting device for lighting a receiving zone of the domestic appliance that can be closed by the door (1).
9. Door (1) according to one of the preceding claims, characterised in that the support element (6) is embodied as a support for at least one, in particular at least two, window (10, 16) of the door (1).
10. Door (1) according to one of the preceding claims, characterised in that the support element (6) is embodied in one piece.
11. Door (1) according to one of the preceding claims, in which the cover (12) is embodied from plastic or metal, in particular stainless steel.

Images