WO2011161070A1

WO2011161070A1 - Household appliance for preparing foods and method for operating such a household appliance

Info

Publication number: WO2011161070A1
Application number: PCT/EP2011/060273
Authority: WO
Inventors: Rainer Lebacher; Franz Gschwendner
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2010-06-23
Filing date: 2011-06-21
Publication date: 2011-12-29
Also published as: DE102010030407A1

Abstract

The invention relates to a household appliance for preparing foods, comprising a cooking chamber (2), which is defined by walls (3 to 5, 11) of a muffle (6) and in which steam is present during operation of the household appliance (1), wherein said steam can be conducted out of the cooking chamber (2). An energy recycling device (14) is provided, by means of which energy stored in the steam (21) can be extracted from the steam and at least some of the thermal energy can be recycled into the cooking chamber (2). The invention also relates to a method for operating a household appliance for preparing food, comprising an energy recycling device (14).

Description

Domestic appliance for preparing food and method for operating such a domestic appliance

The invention relates to a Haugerät for preparing food, with a cooking chamber which is bounded by walls of a muffle. In the cooking chamber steam is present during operation of the domestic appliance, which is executable from the oven. Furthermore, the invention relates to a method for operating such a household appliance for preparing food.

A domestic appliance for preparing food, such as an oven or a Dampfgargerät, includes a cooking space in which food can be cooked. In this case, steam or vapor occurs, which is sucked in known devices from the oven and then blown, for example, on the front of the appliance from the appliance into the environment. Since heat is also generated in the cooking chamber during operation in order to prepare the preparation material, the steam is acted upon in addition to its moisture with heat energy.

From DE 10 2007 019 167 A1 a cooking appliance with heat storage and separation device is known. In a complex manner, there first the cooking chamber atmosphere of the liquid and solid portion is withdrawn, and only then fed the dry gas to the heat storage. In addition to the complex construction, the energy recovery rate is relatively low.

It is an object of the present invention to provide a domestic appliance for preparing food and a method for operating such a domestic appliance, in which or with which a more energy-efficient operation is ensured.

This object is achieved by a domestic appliance having the features of claim 1, and a method having the features of claim 1 1. A domestic appliance for preparing foodstuffs according to the invention comprises a cooking chamber which is delimited by walls of a muffle. During operation of the domestic appliance, steam is present in the cooking space, which can be carried out from the cooking space. The Domestic appliance comprises an energy return device, with which in the steam stored energy can be withdrawn from the steam and at least partially in the cooking chamber is traceable. By such a configuration, a more energy-efficient operation of the domestic appliance can take place. An energy form generated in any case during operation for a household appliance can thus be obtained by the energy recycling device, stored and returned as needed to the cooking chamber, so that it can again be used meaningfully. This reduces the basic primary energy consumption of the household appliance.

The vapor considered to be the medium which is generally still in contact with the liquid and solid phases.

The energy recycling device is preferably arranged outside the cooking chamber, and a storage medium is included in the energy recycling device, which serves for temporarily storing the moisture removed from the steam.

Through this storage medium, the steam exiting from the cooking chamber can be virtually dried and the heat which can be extracted is then released to an air introduced into the cooking chamber, so that dry, warm air can be introduced into the cooking chamber.

The storage medium may be gel-like in one embodiment. For example, silica gel may be provided in such an embodiment.

However, it can also be provided that the storage medium is zeolite.

In a preferred embodiment, it is provided that the storage medium is arranged exchangeably or removable in the energy recycling device. In addition, it is arranged in the Haugerät that it is always easy to handle accessible. This facilitates interchangeability. In particular, when the storage medium has to be replaced for maintenance purposes or due to wear, this can thus be done and in particular also be simple and inexpensive. The energy recycling device preferably has a fan with which the steam can be sucked out of the cooking chamber and / or the air heated with the heat removed from the steam can be blown back into the cooking chamber. In particular, a fan may be provided in this context, which ensures both functionalities. However, it can also be provided two fans, one of which causes the suction from the cooking chamber and the second performs the blowing of the heated air into the cooking chamber.

Preferably, the arrangement of the fan is such that it is relatively close to and adjacent to the storage medium. The storage medium is preferably arranged adjacent to and close to an exit from the cooking chamber. As a result, an embodiment with short paths and particularly efficient energy recovery can be made possible.

It is preferably provided that a circuit encompassed by the energy recycling device is designed as an open circuit. As a result, at least part of the steam and the heat extracted therefrom are discharged into the environment from the domestic appliance.

It is preferably provided that a circuit encompassed by the energy recycling device is closed. By such a configuration, the heat circulates almost completely within the domestic appliance and it can be recycled to a large extent in the cooking chamber.

It is preferably provided that the operation of the energy recycling device can be activated as a function of an operating state of the domestic appliance. The domestic appliance preferably comprises a control unit, which then controls the activation and deactivation of the energy recycling device. In particular, it is thus provided that, when the domestic appliance is switched on and the cooking program has been started and running, for example, depending on operating parameter values, the energy recycling apparatus is switched on. Especially in the case of the specifically mentioned storage media silica gel and zeolites, an advantage is to be seen in that they also serve as a thermochemical heat storage. Silica gel, for example, has the property of releasing heat during adsorption, ie the absorption of water, and absorbing heat during desorption, drying.

As a result of this controlled operation, the aspiration can thus be optimized in terms of quantity and / or time as required and metered. It is thus sucked at any time undesirable amount of steam from the oven, and it can also be very specific energy recovery and heat input into the oven.

The extraction can be done, for example, next to a door which closes the feed opening to the cooking chamber and thus also the muffle. However, it can also be an extraction, for example via the top wall of the muffle. The cycle of the energy recycling device can be formed so that, for example, the extracted heat is then blown over appropriately heated air over the front of the cooking chamber in this. However, it can also be provided that this heated air is then blown through an existing hot air box at the back of the muffle in the cooking chamber. In the hot air box, for example, a hot air blower and an additional heater for heating the air may be arranged.

In such an embodiment, a coupling of the energy return device with other energy sources, in particular heat energy sources, can be provided in a particularly advantageous manner.

In a particularly advantageous manner, it is provided that the energy recycling device has a pulsed operation. This means that the energy recycling device for sucking the steam out of the cooking chamber and for returning the heat extracted from this steam in the cooking chamber is operated quasi clocked and thus alternately turned on and off. The pulse durations can be between a few seconds and several minutes. This depends on the type of blower, diameters of the cycle of the energy return device and the basic conceptual design, such as the energy return device is designed. In particular, this can also be done depending on state parameters in the oven, for example, the temperature, the vapor concentration and the like. Depending on this, the duration of time, how long the pulse operation is carried out, and which pulse durations are to be used, can be determined. This too is preferably controlled via the control unit.

It can also be provided that the operation of the energy recycling device can be activated as a function of an actuation of an operating element of the domestic appliance or of a functional component of the domestic appliance. Thus, it may be provided in this context that the energy return device is intentionally activated or deactivated by a user by deliberately confirming an operating element. In addition, however, virtually an intuitive automatic activation or deactivation can take place if the user, for example, grips a handle of the door closing the cooking chamber as a functional component. With such a configuration, it can even be additionally achieved that not unnecessarily much steam flows toward the user when the door is opened.

Furthermore, the invention relates to a method for operating a domestic appliance for preparing food, with a cooking chamber which is bounded by walls of a muffle, and in which there is steam during operation of the Haugeräts, which is executable from the cooking chamber. By means of an energy recycling device stored in the steam energy is removed from the steam and at least partially recycled into the cooking chamber.

In addition, it can be provided that the circuit can also perform a drying function or a humidifying function of the medium, wherein it has corresponding means for this purpose.

Advantageous embodiments of the domestic appliance according to the invention are to be regarded as advantageous embodiments of the method according to the invention.

An embodiment of the invention will be explained in more detail with reference to a schematic drawing. The single FIGURE shows a schematic sectional view of a baking oven 1 as a domestic appliance for preparing food. The oven 1 comprises a cooking chamber 2, which is bounded by walls 3, 4 and 5 of a muffle 6. The respective vertical side walls are not shown in the sectional view or not marked in detail. On the front side, the muffle 6 has a feed opening 7, which can be closed by a door 8. The door 8 has on its outside a handle 9. The muffle 6 has on its rear side a hot air box 10, which is formed by a rear wall 5 and a rear rear wall 1 1. In the hot air box 10, a hot air blower 12 and a radiator 13 are arranged. The heated air can thus be blown through openings in the front rear wall 1 1 in the cooking chamber 2.

The oven 1 further comprises an energy recycling device 14. The energy recycling device 14 is arranged and formed outside the cooking chamber 2. The energy return device 14 comprises a fan 15, which is arranged above the ceiling wall 4 in the exemplary embodiment. It is designed to suck off hot steam formed in the cooking chamber 2 via an opening 16 in the ceiling wall 4. This opening 16 can be closed and opened via a flap 17.

For this purpose, the oven 1 comprises a control unit 18. The energy return device 14 further comprises a channel 19, is passed through the means of the blower 15 from the cooking chamber 2 via the opening 16 extracted steam through a storage medium 20. The storage medium 20 is positioned downstream of the fan 15 in the embodiment in the flow direction. It is also arranged as close as possible and adjacent to the blower 15. The storage medium 20 may be, for example, silica gel or zeolites. By this storage medium 21 moisture and heat is removed from the steam. The storage medium thus serves as a thermochemical heat storage. The stored in the steam 21 heat energy is then used to heat an air flow 22 and is then returned to the cooking chamber 2. In the exemplary embodiment, this is done via the hot air box 10th It should be emphasized that the circuit can also have another way of returning. Thus, the return can also take place via a front side of the muffle 6. Likewise, the positioning of the fan 15 and the memory 20 may also be provided at a different location. For example only, a possible further position of the blower 15 by the reference numeral 15 'is indicated in this context by dashed lines and also indicated by a further position of the storage medium by the reference numeral 20'. This means that these components and thus also the energy return device 14 can also be formed on a front side adjacent to the door 8 next to the muffle 6. In such a configuration can then also be provided that both the suction takes place on this front region of the muffle 6, as well as that the Wiederrückführen the steam withdrawn from the heat energy 21 takes place by heated air over this front.

The circuit can be designed both open and closed. In the embodiment shown, it is also coupled to a further heat energy source, namely the hot air box 10 and thus also the radiator 13.

In addition, the energy return device 14 can be controlled by the control unit 18. In this context, in particular, the suction of the steam 21 is controlled in terms of quantity and / or time, in which case in particular the fan 15 is controlled accordingly. Preferably, a pulse operation of the energy return device 14 is provided here.

This pulsed operation can take place as a function of operating parameter values of the domestic appliance during operation, for example when the preparation program has been started or is in progress. However, it can also be provided that the activation or deactivation of the energy return device 14 is effected in dependence on the actuation of a control element 23. It can also be provided that with the gripping of the handle 9 by a user, the energy return device 14 is actuated. LIST OF REFERENCE NUMBERS

1 oven

2 cooking space

3, 4, 5 walls

6 muffles

7 feed opening

8 door

9 handle

10 hot air box

1 1 rear wall

12 hot air blower

13 radiators

4 energy return device 15, 15 'blower

16 opening

17 flap

18 control unit

19 channel

20, 20 'memory

21 steam

22 air flow

23 control element

Claims

claims

Domestic appliance for preparing foodstuffs, comprising a cooking chamber (2) delimited by walls (3 to 5, 11) of a muffle (6) and in which steam (21) is present during operation of the household appliance (1) From the cooking chamber (2) is executable, characterized in that an Energieruckfuhrvornchtung (14) is formed, with which stored in the steam (21) energy the

Steam (21) can be withdrawn and the heat energy at least partially in the

Cooking chamber (2) is traceable.

Domestic appliance according to claim 1, characterized in that the

Energy return device (14) outside the cooking chamber (2) is arranged and a storage medium (20, 20 ') which serves for the intermediate storage of the energy extracted from the steam.

Domestic appliance according to claim 2, characterized in that the

Storage medium (20, 20 ') is gel-like.

Domestic appliance according to claim 3, characterized in that the

Storage medium (20, 20 ') is silica gel.

Domestic appliance according to claim 2, characterized in that the

Storage medium (20, 20 ') zeolites is.

Domestic appliance according to one of the preceding claims 2 to 5, characterized

in that the storage medium (20, 20 ') is exchangeable in the

Energy return device (14) is arranged.

Domestic appliance according to one of the preceding claims, characterized in that the operation of the energy return device (14) can be activated as a function of an operating state of the domestic appliance (1), in particular the

Energy return device (14) has a pulse operation.

8. Domestic appliance according to one of the preceding claims, characterized in that the operation of the energy return device (14) depending on an actuation of an operating element (23) or a functional component (9), in particular a door handle (9), of the domestic appliance (1) can be activated ,

9. Domestic appliance according to one of the preceding claims, characterized in that the energy return device (14) with at least one further heat energy source (13) of the domestic appliance (1) is coupled.

10. Domestic appliance according to claim 9, characterized in that the heat energy source is a heating element (13) in a hot air box (10) in a muffle (6), in particular its rear wall, of the domestic appliance (1).

1 1. A method for operating a domestic appliance (1) for preparing food, with a cooking chamber (2) which is bounded by walls (3 to 5) of a muffle (6), and in which during operation of the domestic appliance (1) steam (21) is present, which from the cooking chamber (2) executable, characterized in that by means of a

Energy return device (14) in the steam stored energy is removed from the steam and the heat energy is at least partially recycled into the cooking chamber (2).