EP2444742A2 - Heat accumulator oven - Google Patents

Abstract

The heat-storage cooker comprises a heat source (22), a thermogenerator with a hot side and a cold side for generating electrical energy during operation of the heat source configured to supply an electrical energy to a electrical functional unit, an electronic controller (26) comprising a microprocessor, an energy-storage unit (28) for storing electrical energy generated by the thermogenerator, and heat sinks. The hot side is provided close to the heat source with good thermal coupling to the heat source and the cold side is routed to a surrounding area and a baking-oven muffle (20). The heat-storage cooker comprises a heat source (22), a thermogenerator with a hot side and a cold side for generating electrical energy during operation of the heat source configured to supply an electrical energy to a electrical functional unit, an electronic controller (26) comprising a microprocessor, an energy-storage unit (28) for storing electrical energy generated by the thermogenerator, and heat sinks. The hot side is provided close to the heat source with good thermal coupling to the heat source and the cold side is routed to a surrounding area, a baking-oven muffle (20), a cooking plate, and/or a heat storage unit of the heat-storage cooker. The electronic controller is provided with a function memory, an automatic program, and electronically actuated and evaluated operator control elements such as touch switches. The energy-storage unit comprises a rechargeable battery. The thermogenerator is coupled to: the heat sources that are designed for continuous or most-frequent or primary operation; and the heat sinks that remain cool and/or less hot even during permanent operation in such a way that a sufficiently large temperature difference is supplied to the thermogenerator to generate the electrical energy. The heat-storage cooker is configured without an electrical connection to an external electrical energy source.

Description

Field of application and state of the art

The invention relates to a heat storage stove with at least one heat source.

From the DE 1 141 063 A is an electrically heated heat storage known with several hot plates and a memory core including heating element described as a heat source. In this case, the heating element is an electrical heating element, the heat storage stove so imperatively requires an electrical connection.

Furthermore, there are efforts to be able to use even with heat storage units with heating by gas, oil or wood other functions. In particular, it should be possible for an electronic control to program different operating modes.

Task and solution

The invention has for its object to provide a heat storage furnace mentioned above, can be avoided with the problems of the prior art and in particular in a self-sufficient operation, regardless of an electrical connection other functions can be provided.

This object is achieved by a heat storage stove with the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. The wording of the claims is incorporated herein by express reference.

According to the invention, the heat storage stove has a thermogenerator with a hot side and a cold side. The thermogenerator generates electrical energy in a manner known per se during operation of the heat source for supplying an electrical functional unit of the heat storage cooker with electrical energy. For this purpose, the hot side is provided close to the heat source and has a good thermal coupling thereto. The cold side is led to the passage of the thermal energy to the environment, to a bakery or to a hotplate of the heat storage stove. In a further embodiment, the cold side can also be performed on the heat storage itself, which may for example also be a water bath and whose temperature is lower than that of the heat source.

Thus, the thermal generator is heated by the heat source or thermal energy introduced on its hot side. On the cold side, the thermal energy is removed or dissipated and generated in a known manner, the electrical energy.

With the invention it is possible to gain electrical energy even with heat storage stoves with non-electric heating or without electrical connection. With this electrical energy, the aforementioned comfort functions, such as an electric control with all known possibilities, can be operated. Furthermore, displays or display displays could be provided on the heat storage stove or, if it has a baking oven muffle, a fan for hot air operation.

As mentioned above, the heat storage stove in a preferred embodiment, an electronic control, which in particular also has a function memory, automatic programs and / or electronically controlled and evaluated controls, particularly preferably as a touch switch has. Their energy needs can be generated with a few watts of a not too large thermogenerator. In particular, it can carry out automatic sequence programs or so-called automatic programs in the case of a heat storage stove operated by gas, which then also has, for example, at least one electronically controlled gas valve. Furthermore, a timer operation can be made possible, which makes at least by visual and / or audible indications of timing. Furthermore, just the possibility of using touch switches is very beneficial.

In a further embodiment of the invention, the heat storage stove may have an energy storage, advantageously as a battery or possibly also with at least one capacitor. Thus, electrical energy generated by the thermal generator, but not directly consumed, can be stored for a later-on-need. For example, the thermal generator can also be operated permanently as long as the heat source generates heat and, for example, even when the power is relatively small, it can fill and keep a larger energy store. From this, in turn, for the actual use of the heat storage stove considerably more electrical energy can be pulled out than is currently being generated by the thermal generator. As a result, and in conjunction with an aforementioned electronic control, it may also be possible for the heat storage stove to heat up, so to speak, automatically at certain programmed times, for example at noon and in the evening. At night, it cools down again when the probability of its use is very low.

In a further embodiment of the invention, the heat storage stove may have a plurality of heat sources, for example because it has a plurality of cooking plates or in addition an oven with muffle. In this case, the thermogenerator is advantageously coupled to that heat source, the permanent or most frequent or main Operation is formed. As a rule, this is a heat source connected at least to a hotplate, since hotplates are also used more frequently in hot storage ovens than any oven muffle that may be present. So a maximum long-lasting operation of the thermal generator can be achieved.

In a further embodiment of the invention, the heat storage stove may have heat sinks. In this case, the thermal generator is coupled to that heat sink, which remains so cool or less hot in continuous operation, so that a sufficiently large temperature difference is applied to the thermogenerator for its operation with the required power.

In a further advantageous embodiment of the invention, it is even possible that the heat storage stove is not only not connected to an electrical energy source, but has no such connection at all. He then gets self-sufficient in any case.

Another consideration, to which of several heat sources the thermogenerator is coupled, may also depend on how easy it is to remove the thermal energy on the cold side of the thermogenerator and whether this is done to the environment, to a baking oven or to a hotplate should.

These and other features will become apparent from the claims and from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in one embodiment of the invention and in other fields be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into individual sections as well as intermediate headings does not restrict the general validity of the statements made thereunder.

Brief description of the drawings

Fig. 1

eine schematische Funktionsdarstellung eines Wärmespeicherherdes mit einer Wärmequelle, einer Kochplatte und einer Backofenmuffel sowie verschiedenen Anbringungsmöglichkeiten für Thermogeneratoren und

Fig. 2

eine alternative Ausführung eines Wärmespeicherherdes mit zwei Kochplatten und zwei Backofenmuffeln sowie verschiedenen Anbringungsmöglichkeiten für Thermogeneratoren.

Embodiments of the invention are shown schematically in the drawings and will be explained in more detail below. In the drawings shows:

Fig. 1

a schematic functional representation of a heat storage stove with a heat source, a hot plate and a baking oven muffle and various attachment options for thermal generators and

Fig. 2

an alternative embodiment of a heat storage stove with two hotplates and two oven muffles and various attachment options for thermal generators.

Detailed description of the embodiments

In Fig. 1 a heat storage stove 11 is shown according to the invention in a first embodiment. The heat storage stove 11 has a housing 12 and a cooking plate 14 at its top with a base 16. The hotplate 14 can be covered with a cover 17 shown in dashed lines, for example via a hinge, the lid 17 is thermally very good thermal insulation, so when not in use, no or only as little heat as possible is unnecessarily lost via the cooking plate 14. Furthermore, the heat storage stove 11 has a baking oven muffle 20, which is shown only schematically.

The heat storage stove 11 has a heat source 22 of conventional design, the heating and heating mode for the present invention basically does not matter. The heat source 22 is basically very thermally insulated to the outside or within the housing 12. It may contain or have a heat accumulator of conventional design, but not here explicitly shown separately. Via a first thermal generator 24a, the heat source 22, possibly via a heat accumulator, with the base 16 and thus connected to the hotplate 14 thermally or thermally conductive. Via a second thermal generator 24b, the heat source 22 is connected to the baking oven muffle 20 thermally conductive.

Instead of the thermal generators 24a and 24b may be provided in practice either a direct coupling or possibly movable heat transfer elements, in particular made of solid metal or in the form of heat pipes or the like .. It is also possible to provide only one of the thermal generators 24a or 24b. Furthermore, they need not necessarily form the only thermal or heat-conducting connection between the heat source 22 and the base 16 of the cooking plate 14 and the oven muffle 20, but it can be additionally or structurally provided in addition special heat transfer elements, as they are customary ,

Finally, a third thermal generator 24c is provided at the heat source 22, shown in dashed lines, but which is applied to the outside or to the housing 12 or a corresponding housing wall. This means that he gives his transmitted heat to the environment.

All three thermal generators 24a to 24c are connected to a controller 26 to the power supply. As explained above, the thermal generators 24a and 24b generate electric power by the temperature difference between the heat source 22 and the submount 16 including the cooking plate 14 in the case of the thermogenerator 24a and the oven muffle 20 in the case of the thermogenerator 24b. In cooking operations on the hotplate 14 there is usually a temperature of about 100 ° C to 250 ° C, while the heat source 22 is usually herds in heat storage a higher temperature has, for example, 300 ° C to 400 ° C. A hot side of the thermal generator is applied to the heat source 22 and a cold side just to the base 16 and the oven muffle 20. Since modern thermal generators have an efficiency of about 3% to 5% and, for example, 10 watts of electrical power required to operate the controller 26, a thermal power or heat of 200 watts to 330 watts must be passed through the thermogenerator. However, this is a realistic heating value both for a hotplate 14 and for the oven muffle 20, taking into account that they are constantly heated anyway due to the permanent heat transfer to the heat source 22 and are thus at temperature. If more thermal power is passed through a thermogenerator, it can either generate even more electrical energy and, for example, charge the energy store 28 connected to the controller 26.

Alternatively, using the energy accumulator 28, the thermogenerator can also be made smaller or for a lower continuous power. If, however, this can be generated by the thermal generator over a very long time, the energy store 28 can be charged and, in addition, the controller 26 can be supplied with the necessary power overall. In such smaller thermal generators, a further heat transfer element is then additionally provided either to the base 16 of the hotplate 14 or to the oven muffle 20 in order to conduct sufficient heat from the heat source there.

The controller 26 is further connected to controls 29 on the left upper side of the heat storage stove 11, with which, for example, timer functions or processes can be controlled or monitored for the mode of the heat storage stove 11. These controls 29 may be designed as electronically controlled and evaluated touch switch and possibly also a not shown LCD or LED display have as quasi-modern control device for the heat storage stove eleventh

Both the oven muffle 20 with a door and the hotplate 14 through its lid 17 may be very well thermally insulated to the outside, so that the heat storage stove 11 so quasi at rest emits as little heat. On the one hand, this could disturb the environment and, on the other hand, this is of course bad for the energy balance or energy consumption of the heat storage stove 11. If, however, the heat storage stove 11 is additionally used as space heating, this does not disturb or even be planned. But since at least in warm seasons this function is not needed or even undesirable under certain circumstances, this effect should be able to be turned off and also the heat storage stove 11 should not consume unnecessarily much energy. For this reason, the thermal power from the heat source 22 through the thermal generators 24a and 24b towards the base 16 of the hotplate 14 or the oven muffle 20 rather low, since they emit just a small amount of heat during rest periods of the heat storage hearth. However, it could still be provided here that a thermogenerator 24 generates some electrical energy, even if only a few watts. After all, with these, the energy storage 28 can be charged with a longer charging time. Since usually the rest times of a stove last several times longer than the operating times, the continuous power of a thermogenerator 24a or 24b in the idle state by the corresponding factor may be less than the electrical power required by the controller 26.

As a third option for a thermogenerator, the thermal generator 24c shown in dashed lines is provided, which just bears against the wall of the housing 20 and gives off heat there, which is conducted through it by the heat source 22. Of course, the thermogenerator is with its cold side to the housing 12, while with his Hot side of the heat source 22 is applied. Such a thermal generator 24c, which emits the thermal energy conducted therethrough to the outside in the environment, although a certain waste of energy, because the heat is just released to the environment. If the heat storage stove 11 but also be used as the aforementioned space heating, this heating power can be just passed through the thermogenerator 24c and discharged into the room. Since there is usually a significantly lower temperature on the cold side of the thermogenerator 24c or more heat energy is removed than in the case of the thermogenerators 24a and 24b, it can also be made smaller. An improved and thus more efficient design can provide that in the region of the thermal generator 24c on the housing 12 a conventional cooling possibility is provided, for example a separate heat sink.

The three thermal generators 24a, 24b and 24c may be provided alternatively or in any two or even all three in a heat storage stove 11. Thus, it can be achieved that depending on the use of the heat storage stove 11, ie operation of the hotplate 14 or operation of the oven muffle 20, at least temporarily more thermal energy can flow through the thermogenerator than at rest of the heat storage stove 11. Thus, at least one of the thermal generators slightly more electrical energy for the controller 26 and / or to charge the energy storage 28 can be generated.

In the alternative heat storage according to the invention 111 according to Fig. 2 On a housing 112, two cooking plates 114, each with a base 116 on the housing 112 are provided. There is a single oven muffle 120 is provided. However, here two heat sources 122 and heat storage cores are provided, each directly under one of the cooking plates 114 and both adjoin the oven muffle 120. However, thermal generators 124a and 124b are only on the left heat source 122a, namely at a substructure 116a of the left cooking plate 114a and at the left region of the oven muffle 120. The right heat source 122b is not connected or provided with thermal generators at all, ie can not generate electrical energy in the illustrated embodiment.

The thermal generators 124a and 124b are connected to a controller 126 having an energy storage 128, similar to FIG Fig. 1 , Furthermore, it is connected to similar controls 129 on the top of the heat storage hearth 111.

In the embodiment of Fig. 2 It should be explained that in this embodiment of the heat storage oven 111, the left cooking plate 114a is the one most commonly used for cooking because of its size or arrangement. Therefore, the arrangement of the thermal generator 124a at this point is just right. Not necessarily but advantageously, the heat source 122a also has the second thermogenerator 124b towards the oven muffle 120.

Not shown, but easy to imagine and often implemented in practice, is an embodiment of a heat storage stove, in which a single heat source is connected to a plurality of cooking plates or heats them. Then, a thermogenerator can also be interposed again for each cooking plate. Alternatively, a thermogenerator may be provided only to the cooking plate, which in turn is intended for main operation due to size or arrangement, since it is most commonly operated. Thus, the number of installed in the heat storage stove thermogenerators can be kept lower.

Depending on the temperature gradient of the heat source against hotplates, oven muffle or environment, the size of the thermal generators can be varied or adjusted accordingly. When providing multiple thermal generators for a single controller, either electrical energy is generated by all at the same time. Alternatively, mainly those thermal generators can generate electrical energy through which a great deal of heat is passed or which are connected to an operating hotplate or oven muffle. There prevails at the cold side of the thermogenerator a lower temperature than usual.

Claims (6)

Heat storage stove with at least one heat source, characterized in that it comprises a thermogenerator with a hot side and a cold side for generating electrical energy during operation of the heat source for supplying an electrical functional unit of the heat storage stove with the electrical energy, wherein the hot side is provided close to the heat source with good thermal coupling thereto and wherein the cold side is guided to the environment, to a baking oven muffle, to a hotplate or to a heat storage of the heat storage stove. Heat storage stove according to claim 1, characterized in that it comprises an electronic control, in particular with function memory, automatic programs and / or electronically controlled and evaluated controls, preferably in the form of touch switches. Heat storage stove according to claim 1 or 2, characterized in that it comprises an energy store, preferably in the form of a rechargeable battery, for storing electrical energy generated by the thermal generator. Heat storage stove according to one of the preceding claims, characterized by a plurality of heat sources, wherein the thermal generator is coupled to the one heat source which is designed for continuous or frequent or main operation. Heat storage stove according to one of the preceding claims, characterized by a plurality of heat sinks, wherein the thermal generator is coupled to that heat sink, which remains so cool or less hot in continuous operation that a sufficiently large temperature difference is applied to the thermal generator. Heat storage stove according to one of the preceding claims, characterized in that it is formed without electrical connection to an electrical energy source from the outside.

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