WO2007138015A1

WO2007138015A1 - An oven

Info

Publication number: WO2007138015A1
Application number: PCT/EP2007/055108
Authority: WO
Inventors: Levent Akdag; Ahmet Bozgeyik; Mehmet Marasli
Original assignee: Arcelik Anonim Sirketi
Priority date: 2006-05-26
Filing date: 2007-05-25
Publication date: 2007-12-06
Also published as: TR200808016T1

Abstract

The object of the present invention is to design an oven (1) wherein effective cooking is implemented by means of solving mechanical problems experienced by the thermal deformation of the reflector (7).

Description

Description AN OVEN

[0001] The present invention relates to an oven that provides the cooking process to be implemented more effectively.

[0002] At least one heater and a fan are provided in ovens wherein the cooking process is carried out by convection. The heater and the fan are disposed between the body of the oven and the rear wall of the cooking chamber within this body. The air heated by the heater is activated by the fan and delivered into the cooking chamber through the holes arranged on the rear wall and the food is cooked by means of heat transfer interaction thereof with the food to be cooked. However, the contact of the heated air with the oven body before entering the cooking chamber results in some amount of the energy to be transferred to the outer surroundings through the body. Therefore, that amount of the energy transferred to the air by the heater cannot be used for the cooking process hence the cooking time of food and thus the energy consumption of the oven is increased.

[0003] In order to solve this problem, in state of the art implementations, a reflector plate is disposed between the heater and the body of the oven, providing to keep the energy inside the oven and assist in directing into the cooking chamber.

[0004] However in conventional ovens, particularly in turbo ovens, the problem of overheating the region wherein the heater is situated arises since the total heat transfer area is generally small, and a reflector plate disposed in a region close to the heater will undergo deformation. As a result of deformation, the contact of the reflector with the other components in the oven and particularly with the fan leads to damage in the oven. On the other hand, the deformed reflector can not reflect heat into the cooking chamber as is required.

[0005] In order to avert this type of adversities, various implementations have been developed in state of the art.

[0006] In the state of the art Japanese patent application no. JP62123229, the description is given for an oven comprising a heat reflecting plate manufactured of a shape memory metal alloy in order to prevent the probdble adversities of the thermal deformation that will occur. The plate which is flat in room temperature, by means of its shape memory has the configuration of a partial circle when heated. Consequently, the heat reflecting plate is prevented from being in contact with the heater and/or the other components of the cooker as a result of deformation and also a surface is formed that provides effective reflection. However, the production of the reflector that is the subject of the application is difficult and costly due to the use of shape memory alloy.

[0007] In another state of the art document, the Japanese patent application no.

JP62175532, a heat generating device comprising a reflection plate is described. To keep the reflection plate from deformation so that it will not lose its reflection feature, it is produced shorter than the grooves wherein it is fixed, allowing thermal expansion without deformation. However, the said invention does not propose a solution for prevention of expansion of the reflector or preventing from touching other components in the device as a result of expansion.

[0008] The object of the present invention is to design an oven wherein effective cooking is implemented by means of solving the problems experienced by the thermal deformation of the reflector.

[0009] The oven designed to fulfill the objective of the present invention is explicated in the attached claims. The oven comprises at least one reflector, disposed between the outer cabin and the heater, assisting to keep the energy in the oven and to be directed into the cooking chamber and at least one preventer that prevents the reflector from getting in contact with the &n or other components of the oven by being deformed as a result of overheating.

[0010] In an embodiment of the present invention, the preventer is a rod that is fixed on the heater. The preventer is positioned at the center of the ring shaped heater such that a barrier is formed. Accordingly, the reflector changing shape as a result of thermal deformation is prevented from passing through the heater to reach the &n. A more effective obstruction is provided by using together more than one preventer.

[0011] In another embodiment of the present invention, the preventer is shaped like a cage. The reflector, when deformed, is held by the said cage and prevented from getting in contact with the &n or the side walls. In this embodiment, the preventer is either disposed between the &n and the heater, or between the heater and the reflector or such that the reflector is partially or entirely encircled.

[0012] In another embodiment of the present invention, the preventer is in the form of grooves formed on the reflector. By means of the grooves, the thermal resistivity of the reflector is increased; the amount of deformation decreases and thus the risk of getting in contact with the other components of the oven is eliminated. Accordingly, the damage in the oven resulting from the deformation of the reflector is prevented along with increasing the effectiveness of the cooking process.

[0013] The oven designed to fulfill the objective of the present invention is illustrated in the attached figures, where:

[0014] Figure 1 - is the sideways schematic view of an oven.

[0015] Figure 2 - is the schematic view of the reflector, the heater and the fan in an embodiment of the present invention.

[0016] Figure 3 - is the schematic view of the reflector in another embodiment of the present invention.

[0017] The elements illustrated in the figures are numbered as follows:

1. Oven

2. Outer cabin

3. Cooking chamber

4. Rear wall

5. Heater

6. Fan

7. Reflector

8. Preventer

[0018] The oven (1) comprises an outer cabin (2) a cooking chamber (3) positioned inside this outer cabin (2) at least one fan (6) disposed in the cooking chamber (3) for activating the air, at least one heater (5) again disposed in the cooking chamber (3) for heating the air, a rear wall (4) that divides the volume of the cooking chamber (3) into two such that a region is formed wherein the fan (6) and the heater (5) are situated, and at least one reflector (T) that assists in directing the energy into the cooking chamber (3) by being disposed between the outer cabin (2) and the heater (5) (Figure 1)

[0019] The oven (1) of the present invention comprises at least one preventer (8) that prevents the reflector (T) that is deformed as a result of being heated, from getting in contact with the fan (6) and the other components.

[0020] In an embodiment of the present invention, the preventer (8) is a rod that is fixed on the heater (5) The preventer (8) is positioned such that the reflector (T) which is deformed with a camber formed on the surface thereof, is prevented to contact with the fan (6) by passing through the ducts of the heater (5) (Figure 2) Accordingly, the deformed reflector (T) is prevented from contacting the fan (6) and causing damage and also the shape and amount of the deformation is limited. More than one and /or variously shaped or configured preventers (8) can be utilized to provide an effective obstruction.

[0021] In an embodiment of the present invention, the utilized heater (5) is ring shaped. Three rod shaped preventers (8) are used that are mounted from their corners at the center of this ring shaped heater (5) such that an equilateral triangle is formed (Figure

2)

[0022] In another embodiment of the present invention, the preventer (8) is shaped like a cage positioned to prevent the reflector (T), in case of being deformed, from getting in contact with the other components, particularly with the Ian (6) or restricting from reaching the side walls. In this embodiment, the preventer (8) can either be disposed between the reflector (T) and the heater (5) or between the heater (5) and the fan (6) such that the reflector (T) is prevented from passing through the heater (5) to reach the fan (6) or such that the reflector (T) is partially or entirely encircled as well. Consequently, the contact of the reflector (T) with the other components can be restricted, in particular with the fan (6) and the side walls.

[0023] In another embodiment of the present invention, the preventer (8) is in the form of grooves formed on the reflector (T) increasing thermal resistivity. By means of the preventer (8) thermal resistivity is increased; the amount of deformation is minimized and thus the contact of the reflector (T) with the fan (6) or the other components of the oven (1) for example the side walls, is prevented. Furthermore, by means of the reflector (T) which is less deformed, a more effective reflection is provided thus increasing the effectiveness of the cooking process (Figure 3)

[0024] In this embodiment, the groove shaped preventers (8) can be formed to be adapted with the rotation direction of the fan (6) Accordingly the preventer (8) besides from preventing the deformation of the reflector (T) by redounding a high thermal resistivity feature thereto, can also contribute in directing the air activated by the fan (6) into the cooking chamber (3)

[0025] In another embodiment of the present invention, two or more of the embodiments explicated above can be used together.

[0026] By means of the oven (1) of the present invention, the contact of the reflector (T) to the fan (6) and other components of the oven (1) as a result of being deformed from overheating is prevented. By means of the present invention, an effective heating process is provided by solving the problems experienced as a result of thermal deformation of the reflector (T) utilized in the oven (1)

Claims

[0001] An oven (1) comprising -an outer cabin (2), -a cooking chamber (3) positioned inside this outer cabin (2), -at least one fan (6) disposed in the cooking chamber (3) for activating the air, -at least one heater (5) disposed in the cooking chamber (3) for heating the air, -a rear wall (4) that divides the volume of the cooking chamber (3) into two such that a region is formed wherein the fan (6) and the heater (5) are situated, and -at least one reflector (7) that assiste in directing the energy into the cooking chamber (3) by being disposed between the outer cabin (2) and the heater (5); -and characterized by -at least one preventer (8) that prevent the reflector (7) that is deformed as a result of being heated, from getting in contact with the fan (6) and the other component.

[0002] An oven (1) as in Claim 1, characterized by a rod shaped preventer (8) that is fixed on the heater (5) such that the deformed reflector (7) is prevented to contact with the fan (6) by passing through the ducte of the heater (5).

[0003] An oven (1) as in Claim 2, characterized by preventers (8) that are mounted from their corners on the ring heater (5) such that an equilateral triangle is formed.

[0004] An oven (1) as in Claim 1, characterized by a preventer (8) that is shaped like a cage, positioned to prevent the reflector (7), in case of being deformed, from getting in contact with the other component, particularly with the fan (6) and the side walls.

[0005] An oven (1) as in any one of the above claims, characterized by a preventer (8) shaped like thermal resistivity increasing grooves formed on the reflector (7).

[0006] An oven (1) as in Claim 5, characterized by a preventer(s) (8) formed to be adapted with the rotation direction of the fan (6) such that they also contribute in directing the air activated by the fan (6) into the cooking chamber (3).