EP1789730B1 - Cooking device comprising a heat accumulator - Google Patents

Description

The invention relates to a cooking appliance with a heat storage device.

Heat storage devices for cooking appliances are already known from the prior art. Thus, for example, in the DT 23 34 285 C3 a convection oven for cooking food by means of hot air is known in which an air-current-charged heat storage for covering an initial heat demand is used. The convection oven and the heat storage can be formed separately. As an example, for this purpose, a heat storage is given, which describes a closed unit with reaching into the cooking chamber of the convection oven heating coils, which are precipitated, for example, with hocherhitzbaren salt solutions.

For so-called combi-dampers in which a cooking operation with hot air and / or steam is possible, the use of energy storage and energy extraction systems is already known in principle. Here is an example of the WO 99/63277 to indicate, according to the energy stored in the energy storage and energy extraction system in the form of thermal, electrical and / or mechanical energy in the cooking appliance, in particular for at least partially operating a heater, a circulation system, a humidity control, a steam generator and / or a cooling unit using a measuring - and control system, is usable. The described structure is quite complex.

Object of the present invention is to provide a heat storage device for a cooking appliance, which overcomes the disadvantages of the prior art, in particular diverse, especially in combi steamers, can be used, while requiring little space and high efficiency.

This object is achieved by a cooking appliance with a heat storage device with a closable by a door housing comprising an interior with a cooking space, at least one heater for generating hot air and / or steam from a steam generator and a fan device for circulating hot air and / or steam in the cooking chamber, wherein the heat storage device at least one storage vessel for at least temporarily receiving a fluid at least above a certain temperature medium and at least one heat exchange device in which at least temporarily at least a portion of the medium is pumpable and which extends into the interior and in the steam generator , wherein the heating device comprises the heat exchanger device.

In this case, a first insulation of the interior and / or a second insulation of the storage vessel may be provided, wherein the first and / or second insulation preferably comprises a vacuum insulation.

Preferred embodiments of the invention are characterized in that the heat exchanger device comprises at least three lines, wherein a first line from the storage vessel, preferably via at least one pump, in the interior and / or in the steam generator, a second conduit from the interior into the storage vessel and extend a third conduit from the steam generator into the storage vessel.

It can be provided that at least a first shut-off member in the first conduit, at least a second shut-off member in the second conduit and / or at least a third shut-off member in the third conduit, wherein preferably the first and second or the first and third or the second and third or the first, second and third shut-off integrated in a unit and / or jointly switchable.

It is also proposed with the invention that the heat exchanger means comprises two heat exchangers, one of which extends between the storage vessel and the interior and the other between the storage vessel and the steam generator.

It can also be inventively provided that the heater has a first heater in the interior, which is preferably arranged concentrically to the impeller of the fan means, a second heater for the steam generator, which is preferably arranged in the region of the water in the steam generator, and / or a third heater for the storage vessel, which is preferably arranged in the region of the storage medium comprises.

It is also proposed that the heat exchanger means between the first and the second conduit concentric with the impeller of the fan means, preferably between the impeller and the first heater extends.

According to the invention it can be provided that the heat exchanger device extends between the first and the third line in the water of the steam generator.

With the invention it is also proposed that the first, second and / or third heating with a primary heating, comprising at least one power source, at least one means for combustion of auxiliaries and / or at least one external heat transfer medium is or are in communication, preferably the waste heat of the first, second and / or third heating of the primary heating is at least partially usable.

Particularly preferred embodiments of the invention are characterized in that the storage vessel comprises at least two areas, wherein the areas are preferably at least temporarily at least partially connected with each other via a fourth shut-off.

It can be provided that the third heater and the first, second and third line are in communication with a region of the storage vessel.

It is further proposed with the invention, a control and / or regulating device connected to the heating device, preferably with the first, second and / or third heater, the blower device, the pump, the first Absperrglied, the second Absperrglied, the third Absperrglied, the fourth shut-off, at least one sensing unit, at least one input unit, at least one output unit, a modem and / or the Internet is in operative connection to use.

According to the invention, it can be provided that the medium is suitable for heat storage and / or consumes or liberates latent heat during a phase transformation, wherein the medium preferably comprises a metal, a salt, a polymer, water, steam and / or superheated steam.

Furthermore, the invention proposes that a heating of the medium, preferably via the third heater, in Garphasen, in which no or little energy is needed, and / or Garpausen, and / or waste heat, such as heat from exhaust air, condensate, non-condensed fractions a cooking medium, water of the steam generator, steam of the steam generator and / or excess steam, is rechargeable with energy.

The invention is therefore based on the surprising finding that a heat storage device in the form of a compact heat storage in the production of hot air and / or steam for a cooking appliance using at least one heat exchanger can be used, which is arranged from a storage vessel, which is separate from the interior of the cooking appliance is, both in the interior of the cooking appliance and the steam generator extends. Thus, a cooking appliance can be operated even without conventional heating in the oven and / or steam generator.

This design makes it possible to provide both the storage vessel and the interior with an individual insulation. Preferably, three lines are provided, which enter the storage vessel, namely one for pumping out Storage medium from the storage vessel in the heat exchanger device, in the region of the interior and / or the steam generator, and two for returning the storage medium from the interior or from the steam generator in the storage vessel, which minimizes the loss of heat energy. Said lines can be made thin, so that an effective operation is possible.

To be particularly advantageous according to the invention has been found to divide the storage vessel into two areas, which are separated by a shut-off, wherein in a first region, a heating device is arranged and extends in the first region, the heat exchanger means, so that, as needed, either the entire storage medium in the storage vessel or only the part thereof in the first region is rechargeable with energy or the same energy can be removed.

Fig. 1

ein erstes erfmdungsgemäßes Gargerät; und

Fig. 2

ein zweites erfindungsgemäßes Gargerät.

Further features and advantages of the invention will become apparent from the following description in which two embodiments thereof are explained in detail with reference to a schematic drawing. Showing:

Fig. 1

a first erfmdungsgemäßes cooking appliance; and

Fig. 2

a second cooking device according to the invention.

As Fig. 1 can be seen, a cooking appliance 1 according to the invention comprises a housing 2 for limiting an interior, which in turn comprises a cooking chamber 3 and a fan chamber 5 separated from the cooking chamber 3 via an air guide member 4. In the interior, a cooking medium 6 is circulatable via an impeller 7. The impeller 7 is driven by an engine 9 via an axle 8. Concentrically around the impeller 7 around a heater 10 is arranged in the fan chamber 5. In addition, the interior is insulated by an insulation 11 from the environment.

So that the cooking appliance 1 can function as a combination damper, a steam generator 20 is also provided, which in turn comprises a heater 21 for heating water 22. The same from the water 22 in the case of heating the same rising water vapor 23 passes via a line 24 into the interior.

Separated from the interior of the cooking appliance 1, a compact heat accumulator 30 is provided. This comprises a storage vessel 31, in which with the interposition of an insulation 32 together with a heater 33, a storage medium 34 is arranged. The storage medium 34 may be solid at room temperature and melted above room temperature during operation of the heater 33 to be pumped into a heat exchanger means 35, 36 via a line 37, 38. The heat exchanger device comprises two areas, namely in the form of the heat exchanger 35, which extends into the steam generator 20, better in the water 22 within the same, and in the form of the heat exchanger 36, in the interior, better in the fan chamber 6 between the impeller 7 and the heater 10 extends.

Both the heat exchanger 35 and the heat exchanger 36 is connected via the line 37, 38 with the storage vessel 31 in connection. More specifically, the conduit 37 includes a first conduit portion 37a which extends from the storage medium 34 out of the storage vessel 31 to then split up into two pumps 39, 40. Via the first pump 39, storage medium 34 may be introduced into the heat exchanger 35 via the conduit region 37b be pumped to then get over the line area 37c back into the storage vessel 31 can. Storage medium can enter into the storage vessel 31 via the second pump 40 with the interposition of the line region 38b into the heat exchanger 36 and via the line region 38c. Thus, the line region 37a fulfills two functions, namely, the suction of storage medium for both the heat exchanger 35 and the heat exchanger 36, which is in Fig. 1 is symbolized by using the further reference numeral 38a.

It would also be conceivable that the line areas 37c, 38c meet to enter together into the storage vessel 31, so that then the storage vessel 31 together with insulation 32 would only be broken twice for the purpose of introducing a line.

As Fig. 1 can be seen, cooking device 1 according to the invention is constructed to save space; In particular, the compact heat accumulator 30 does not cause an oversized additional volume.

In addition, the heat stored in the compact heat accumulator 30 heat can be transmitted with low loss either for heating the circulated cooking medium 6 or to generate steam 23 through the use of only three lines 37 a and 38 a, 37 c and 38 c, which enter the storage vessel 31. The insulation 11 and 32 provide for a further reduction of heat loss.

This in Fig. 2 illustrated cooking appliance 1 'comprises substantially the same components as the cooking appliance 1 of Fig. 1 , so that the same parts are identified by the same reference numerals, but provided with an apostrophe. In fact, the cooking appliance 1 'according to the invention differs from the cooking appliance 1 in three respects. First, it should be noted that in the embodiment of the Fig. 2 has been dispensed with the primary heaters 10 and 21 of the cooking appliance 1, so that the heat exchangers 35 'and 36' of the embodiment of the Fig. 2 have to take on the corresponding tasks, which saves costs. Second, it is obvious that in place of the two pumps 39 and 40 of the Fig. 1 now exclusively a pump 41 'in cooperation with two shut-off members 42' and 43 'according to Fig. 2 are used, which is also cost-saving. The third difference is that the storage vessel 31 'in Fig. 2 two regions 31'a and 31'b, which are separable from each other via a shut-off 44 '. The division of the storage vessel 31 'in the two storage vessel areas 31'a and 31'b has the advantage that either the available amount of storage medium 34' is adjustable, which allows a fine adjustment of the heat energy to be delivered or absorbed.

During operation of a cooking appliance 1, 1 'according to the invention, the complete cooking operation is set via a control and / or regulating device, not shown, including the energy intake and energy output of the storage medium 34, 34'. For this purpose, the control and / or regulating device is connected to the motor 9, 9 ', the heaters 10, 21 and 33, 33', the pumps 39, 40 and 41 'and the shut-off members 42', 43 'and 44' ,

The storage medium 34, 34 'can be charged via the heater 33, 33', the water 22, 22 'and / or the cooking medium 6, 6' with energy. An energy output of the storage medium 34, 34 'is, simultaneously or sequentially, both for heating the cooking medium 6, 6' and the water 22, 22 'for generating water vapor 23, 23' possible. Thermal bridges between the storage vessel 31, 31 'with its insulation 32, 32' to the cooking appliance 1, 1 'per se, with its through the insulation 11, 11' limited interior and the steam generator 20, 20 ', by three thin lines 37c , 37'c, 37a, 38a, 37'a, 38'a and 38c, 38'c optimized. On line or channels through the storage vessel 31, 31 'through has been omitted according to the invention.

The features disclosed in the foregoing description, in the claims and in the drawings may be essential both individually and in any combination for the realization of the invention in its various embodiments.

LIST OF REFERENCE NUMBERS

1, 1 '

Cooking appliance

2, 2 '

casing

3, 3 '

oven

4, 4 '

air guide

5, 5 '

blower room

6, 6 '

cooking medium

7, 7 '

blower

8, 8 '

axis

9.9 '

engine

10

heater

11, 11 '

insulation

20, 20 '

steam generator

21

heater

22, 22 '

water

23, 23 '

Steam

24, 24 '

management

30, 30 '

Compact heat storage

31, 31 '

storage vessel

31'a, 31'b

Storage vessel area

32, 32 '

insulation

33, 33 '

heater

34, 34 '

storage medium

35, 35 '

heat exchangers

36, 36 '

heat exchangers

37.37 '

management

37a, 37b, 37c, 37'a, 37'b, 37'c

management area

38, 38 '

management

38a, 38b, 38c, 38'a, 38'b, 38'c

management area

39

pump

40

pump

41 '

pump

42 '

shutoff

43 '

shutoff

44 '

shutoff

Claims (14)

1. Cooking apparatus with a heat accumulator device (30, 30'), having a housing (2, 2') which can be closed by a door and comprises an inner chamber (3, 3', 5, 5') with a cooking chamber (3, 3'), at least one heating device (10, 21, 33, 33', 35, 35', 36, 36') for generating hot air and/or steam from a steam generator (20, 20') and a blower device (7, 7', 8, 8', 9, 9') for circulating hot air and/or steam in the cooking chamber (3, 3'), characterized in that the heat accumulator device (30, 30') comprises at least one storage vessel (31, 31') for at least temporarily accommodating a medium (34, 34') which is fluid at least above a specific temperature and at least one heat exchanger device (35, 35', 36, 36') into which at least some of the medium (34, 34') can be pumped at least intermittently and which extends into the inner chamber and into the steam generator (20, 20'), with the heating device (10, 21, 33, 33', 35, 35', 36, 36') comprising the heat exchanger device (35, 35', 36, 36').
2. Cooking apparatus according to Claim 1, characterized by a first insulation means (11, 11') of the inner chamber (3, 3', 5, 5') and/or a second insulation means (32, 32') of the storage vessel (31, 31'), with the first and/or second insulation means preferably comprising a vacuum insulation means.
3. Cooking apparatus according to Claim 1 or 2, characterized in that the heat exchanger device (35, 35', 36, 36') comprises at least three lines (37, 37', 37a, 37b, 37c, 37'a, 37'b, 37'c, 38, 38', 38a, 38b, 38c, 38'a, 38'b, 38'c), with a first line (37a, 37'a, 38a, 38'a) extending from the storage vessel (31, 31'), preferably via at least one pump (39, 40, 41'), into the inner chamber (3, 3', 5, 5') and/or into the steam generator (20, 20'), a second line (38c, 38'c) extending from the inner chamber (3, 3', 5, 5') into the storage vessel (31, 31'), and a third line (37c, 37'c) extending from the steam generator (20, 20') into the storage vessel (31, 31').
4. Cooking apparatus according to Claim 3, characterized by at least one first shut-off element (42', 43') in the first line (37a, 37'a, 38a, 38'a), at least one second shut-off element in the second line and/or at least one third shut-off element in the third line, with the first and second or the first and third or the second and third or the first, second and third shut-off elements preferably being integrated in one unit and/or it being possible to jointly switch said shut-off elements.
5. Cooking apparatus according to one of the preceding claims, characterized in that the heat exchanger device comprises two heat exchangers (35, 35', 36, 36'), of which one (36, 36') extends between the storage vessel (31, 31') and the inner chamber (3, 3', 5, 5') and the other (35, 35') extends between the storage vessel (31, 31') and the steam generator (20, 20').
6. Cooking apparatus according to one of the preceding claims, characterized in that the heating device (10, 21, 33, 33', 35, 35', 36, 36') comprises a first heater (10) in the inner chamber (3, 5), which first heater is preferably arranged concentrically in relation to the impeller (7) of the blower device (7, 8, 9), a second heater (21) for the steam generator (20), which second heater is preferably arranged in the region of the water (22) in the steam generator (20), and/or a third heater (33, 33') for the storage vessel (31, 31'), which third heater is preferably arranged in the region of the storage medium (34, 34').
7. Cooking apparatus according to one of Claims 3 to 6, characterized in that the heat exchanger device (36, 36') between the first and the second lines (37a, 37'a, 38a, 38'a, 38c, 38'c) runs concentrically in relation to the impeller (7, 7') of the blower device (7, 7', 8, 8', 9, 9'), preferably between the impeller (7) and the first heater (10).
8. Cooking apparatus according to one of Claims 3 to 7, characterized in that the heat exchanger device (35, 35') between the first and the third lines (37a, 37'a, 38a, 38'a, 37c, 37'c) runs in the water (22, 22') of the steam generator (20, 20').
9. Cooking apparatus according to one of Claims 6 to 8, characterized in that the first, second and/or third heaters or heater are/is connected to a primary heater, comprising at least one current source, at least one device for burning auxiliary materials and/or at least one external heat transfer medium, it preferably being possible for the waste heat from the first, second and/or third heater to be at least partially used by the primary heater.
10. Cooking apparatus according to one of the preceding claims, characterized in that the storage vessel (31') comprises at least two regions (31'a, 31'b), it being possible to at least temporarily connect the regions (31'a, 31'b) to one another at least in regions preferably via a fourth shut-off element (44').
11. Cooking apparatus according to Claim 10, characterized in that the third heater (33') and the first, second and third lines (37'a, 38'a, 37'c, 38'c) are connected to a region of the storage vessel (31').
12. Cooking apparatus according to one of the preceding claims, characterized by a control and/or regulating device which is operatively connected to the heating device, preferably to the first, second and/or third heater, the blower device, the pump, the first shut-off element, the second shut-off element, the third shut-off element, the fourth shut-off element, at least one sensing unit, at least one input unit, at least one output unit, a modem and/or the Internet.
13. Cooking apparatus according to one of the preceding claims, characterized in that the medium is suitable for accumulating heat and/or consumes or releases latent heat in the event of a change in phase, with the medium preferably comprising a metal, a salt, a polymer, water, steam and/or superheated steam.
14. Cooking apparatus according to one of the preceding claims, characterized in that a heating means of the medium can be charged with energy, preferably via the third heater, in cooking phases in which little or no energy is required, and/or breaks in cooking, and/or via waste heat, such as heat from exhaust air, condensate, uncondensated components of a cooking medium, water from the steam generator, steam from the steam generator and/or excess steam.

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