WO2012084583A1

WO2012084583A1 - Cooking device

Info

Publication number: WO2012084583A1
Application number: PCT/EP2011/072514
Authority: WO
Inventors: Franz Brunner; Frank JÖRDENS; Jürgen Salomon; Gerhard Schmidmayer
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2010-12-20
Filing date: 2011-12-13
Publication date: 2012-06-28
Also published as: EP2655973A1; DE102010063510A1

Abstract

The invention relates to a cooking device, comprising a cooking chamber (10), which can be closed by a door (4) and is delimited by a cooking device muffle (6), a heating element (30), which is arranged in the cooking chamber beneath a muffle cover (12) of the cooking device muffle, and a reflector plate (40) for reflecting heat onto food to be cooked, which is located in the cooking chamber (10), the reflector plate being arranged between the muffle cover (12) and the heating element (30). The reflector plate (40) has at least one protective layer (50) at least on the side of the food to be cooked.

Description

Cooking appliance

The present invention relates to a cooking appliance with a closable by a door and limited by a cooking appliance muffle cooking, arranged with a muffle cover the cooking appliance muffle in the oven and a heating element arranged between the muffle ceiling and the reflector plate for reflecting heat to a cooking product located in the cooking ,

From DE 601 13 779 T2 an electric oven with a baking chamber, a heating element and a screen is known, which can reflect the radiation of the heating element to the interior of the oven, wherein the screen is attached only to the heating element. In this case, the upper wall of the baking chamber comprises an opening for discharging the cooking fumes, wherein the discharge opening is extended to the interior of the baking chamber by a discharge line, which opens at one end under the heating element. From US 4,629,865 an electric oven with a grill and a reflector is known. The grill element has a plurality of parallel segments connected by curved N-segments. In this case, part of the heat energy generated by the grill is reflected by the reflector in the direction of the food. Basically, the grill heater is placed below the oven ceiling in most cooking appliances to heat the food in the upper insertion levels. In this case, a flat reflector sheet between the oven ceiling and radiator is partly arranged to reduce the heat radiation losses in the ceiling, or to reflect on the food. In the case of the reflector sheets known from the prior art, it may happen, in particular at high temperatures, that, for example, a reflector sheet formed from sheet steel is covered with an oxide layer when heated, which appears yellowish, reddish or blue depending on its thickness. This type of discoloration is called tarnishing. Due to the start-up of the reflector plate more and more radiation is absorbed by the reflector plate, which can ultimately lead to destruction of the same. The object of the present invention is to provide a cooking appliance which at least partially eliminates the disadvantages of cooking appliances known from the prior art.

This object is achieved by a cooking appliance and a method for producing a reflector plate for a cooking appliance according to the appended independent claims. The subclaims relate to preferred embodiments which can be used individually or in combination with each other.

In particular, the present invention relates to a cooking appliance with a closable by a door and limited by a cooking appliance muffle cooking, arranged with a below a muffle cover cooking appliance muffle in the oven and a heating element arranged between the muffle ceiling and the reflector plate for the reflection of heat befindliches in the cooking chamber food over. In this case, the reflector sheet at least gargutseitig at least one protective layer. The advantage of such a cooking device is that oxidation of the coated side of the reflector plate can be prevented. The protective layer applied to the reflector sheet thus acts as tarnish protection, which can ensure the retention of the original reflection properties over a longer period of time, even at high temperatures. Due to the consistently good reflection properties, it is thus also possible to reduce the energy consumption by reducing the radiation losses. Furthermore, an increase in the heat flux density can be achieved on the Gargutbereich.

The reflector plate arranged between the muffle blanket and the heating element is preferably designed such that a focusing of the heat radiation on the food area can be achieved and the losses in the side walls of the oven and the ceiling can be reduced. Preferably, the reflector sheet at least gargutseitig at least one protective layer. However, it can also be provided that the reflector plate has both at the front and the back at least one protective layer. This may depend, inter alia, on the type of manufacturing process. Thus, for example, a reflector sheet produced by a dipping process, the respective protective layer due to the immersion of the reflector sheet in a dip with the corresponding Have coating material on both sides. In contrast, for example, in the case of coating by means of a spraying method, it is possible to provide only one side of the reflector sheet with the protective layer. In an alternative embodiment it can be provided that the muffle cover is formed as a reflector sheet, which can be dispensed with a separate reflector sheet and thus the manufacturing cost can be reduced.

In a preferred embodiment it is provided that the protective layer is substantially transparent. In this case, the reflection properties of the reflector plate can be used to reflect heat on the food in the cooking chamber.

In a further exemplary embodiment it is provided that the protective layer consists of a material with a high degree of reflection. In this case, the reflection properties of the protective layer can be utilized. For this reason, it is possible that the reflector sheet is formed of materials which do not themselves have good reflective properties. For example, it may be provided that the protective layer has suitable additives, such as, for example, particles having good reflection properties, in order to reflect the heat to the food to be cooked in the cooking chamber.

It is preferably provided that the thickness of the protective layer is at most 25 μηι, in particular 1 to 10 μηι. As a result, coatings can be produced which can sufficiently protect the reflector sheet from thermal, chemical and mechanical stress.

Furthermore, it is preferred that the protective layer is based on a lacquer, which is produced in particular by means of sol-gel technology. Particularly preferably, the protective layer comprises a mixture of a silane and / or a polysiloxane with an alkali and / or alkaline earth oxide and / or hydroxide. This makes it possible to produce a scratch-resistant and up to at least 500 ° C temperature-resistant protective layer.

Preferably, the reflector plate made of stainless steel or a steel with an aluminum coating, whereby a cost-effective production can be realized. An advantageous development provides that the reflector sheet has a recess in the region of a radiator section of the heating element. Due to the depression focusing of the heat radiation can be achieved on the Gargutbereich. The depressions can be designed flat or parabolic. It can preferably be provided that a heating element section of the heating element is arranged in a depression in such a way that the heating element section lies substantially at the focal point of the parabolic depression. This makes it possible to achieve efficient focusing of the heat on the food. Furthermore, it is preferably provided that the reflector sheet between two adjacent recesses at least partially having a horizontal portion. As a result, for example, a simple cleaning of the coated reflector sheet can be realized. The present invention further relates to a method for producing a reflector plate for a cooking appliance. In this case, a reflector sheet is provided. The reflector sheet is coated with a lacquer produced by means of a sol-gel technique by a wet-chemical coating method, in particular by a spraying or dipping method. There is a drying of the coated with the paint reflector plate. By this method, high temperature resistant layers for the reflector sheet can be produced.

Preferably, after drying with the lacquer-coated reflector plate, the lacquer is baked into the reflector plate, in particular at a temperature of about 500 ° C. As a result, a durable temperature-resistant protective layer of the reflector plate can be realized.

In the following the invention with reference to a preferred embodiment will be explained in more detail with reference to the drawings.

In it show schematically:

1 shows a central perspective of a cooking appliance according to the invention; Fig. 2 shows a cross section of the cooking appliance muffle of the cooking appliance of FIG. 1 with a

Cutting plane parallel to the closed cooking appliance door;

3 is an enlarged view of the upper portion of the cooking appliance muffle of FIG .. 2

In the following description of the figures, the same reference numerals describe the same or comparable components. Fig. 1 shows a trained as an oven cooking appliance in a central perspective. The oven has a Gargerätemuffel 6, which is closed by a front-bottom hinged oven door 4. By means of the oven door 4, a cooking chamber 10 of the oven is accessible. The cooking chamber 10 consists essentially of the two side walls 16 and 18, and a muffle bottom 14 and a muffle cover 12 and a muffle rear wall 11. In the region of the muffle cover 12th is arranged as a grill element heating element 30 is arranged. The grill heater 30 has a meandering shape. Between the muffle cover 12 and the grill element 30, a reflector plate 40 for reflection of heat is arranged on a cooking product 10 located in the cooking space (not shown). The reflector sheet 40 has a protective layer 50, which serves as tarnish protection. Above the oven door 4, a switch panel 8 is arranged with a plurality of controls.

2 shows a cross section of the cooking appliance muffle of the cooking appliance according to FIG. 1 with a sectional plane parallel to the closed cooking appliance door. In each of the side walls 16 and 18, a plurality of opposing rails 20 and 22 are formed. In these rails 20 and 22 height adjustable in an upper region of the cooking appliance muffle 6 a food support 24 is inserted. Below the muffle cover 12 of the cooking appliance muffle 6 Grillheizkörper 30 is arranged. The Grillheizkörper 30 has radiator sections 30a to 30d, which have a substantially equal distance from each other. Between the muffle cover 12 and the radiator sections 30a to 30d, the reflector plate 40 is arranged, which has a protective layer 50 on the device side. The reflector plate 40 has in the region of the radiator sections 30a to 30d Grill radiator 30 respectively corresponding recesses 42a to 42d. The recesses 42a to 42d have a substantially parabolic shape. The individual radiator sections 30a to 30d are each arranged substantially at the focal point of the parabolic-shaped recess, so that a high reflection of the heat can be achieved on a cooking product (not shown) located in the cooking chamber 10.

Fig. 3 shows an enlarged view of the upper portion of the cooking appliance muffle 6 of the cooking appliance. The reflector sheet 40 has gargutseitig a protective layer 50 with a layer thickness of about 5 μηι on. The protective layer 50 is exaggerated in FIG. 3 to illustrate the situation.

REFERENCE LIST Cooking appliance

oven door

cooking appliance muffle

control panel

oven

Muffle rear wall

muffle ceiling

mold base

Side wall

rail

food support

heating element

a-d radiator section

reflector plate

a-d wells

horizontal section

protective layer

Claims

Cooking appliance having a cooking chamber (10) which can be closed by a door (4) and is limited by a cooking appliance muffle (6), with a heating element (30) arranged below a muffle cover (12) of the cooking appliance muffle in the cooking chamber and between the muffle ceiling (12) and Heating element (30) arranged reflector plate (40) for reflecting heat to a cooking space located in the cooking chamber (10), characterized in that the reflector sheet (40) at least gargutseitig has at least one protective layer (50).

Cooking appliance according to claim 1, characterized in that the protective layer (50) is substantially transparent.

Cooking appliance according to claim 1, characterized in that the protective layer (50) consists of a material with a high degree of reflection.

Cooking appliance according to one of claims 1 to 3, characterized in that the thickness of the protective layer (50) is at most 25 μηι, in particular 1 to 10 μηι.

Cooking appliance according to one of the preceding claims, characterized in that the protective layer (50) is based on a lacquer, which is produced in particular by means of sol-gel technology.

Cooking appliance according to claim 5, characterized in that the protective layer (50) comprises a mixture of a silane and / or a polysiloxane with an alkali and / or alkaline earth oxide and / or hydroxide.

Cooking appliance according to one of the preceding claims, characterized in that the reflector plate (40) made of stainless steel or a steel with an aluminum coating.

8. Cooking appliance according to one of the preceding claims, characterized in that the reflector plate (40) in the region of a radiator portion (30a, 30b, 30c, 30d) of the heating element (30) has at least one recess (42a, 42b, 42c, 42d).

9. cooking appliance according to claim 8, characterized in that the reflector plate (40) between two adjacent recesses (42 a, 42 b, 42 c, 42 d) at least partially a horizontal portion (44).

10. A method for producing a reflector plate for a cooking appliance according to the preceding claims, comprising the steps:

^■ providing a reflector plate;

^■ coating the sheet with a reflector manufactured by the sol-gel technique paint by a wet-chemical coating methods, in particular by a spray or immersion method;

^{■ Dry} the varnish-coated reflector plate.

The method of claim 9, further comprising the step of:

^■ Baking the paint in the reflector sheet, in particular at a temperature of about 500 ° C.