Cooking appliance with recirculation of filtered cooking chamber air, in particular into the cooking chamber

Abstract

One aspect of the invention relates to a cooking appliance (1) having a housing (2), having a muffle (4) which is arranged in the housing (2), wherein the muffle (4) delimits a cooking chamber (5) of the cooking appliance (1), and having a door (14) which is provided for closing the cooking chamber (5), and having a flow duct system (15) by means of which at least air (L1) from the surroundings (16) of the cooking appliance (1) can be guided in the cooking appliance (1), and the air (L) flows in flow ducts (17, 19, 20) of the flow duct system (15) in order to cool the door (14) and / or the housing (2), wherein the cooking appliance (1) has a discharge duct system (24) by means of which media (L2) can be discharged from the cooking chamber (5), wherein the discharge duct system (24) is fluidically coupled, in particular directly, to the flow duct system (15) such that the media discharged from the cooking chamber (5) can be introduced into the flow duct system (15), wherein a filter device (29) is arranged in the discharge duct system (24) and filters the media (L2) discharged from the cooking chamber (5).

Description

[0001] Cooking appliance with recirculation of filtered cooking chamber air, especially into the cooking chamber

[0002] One aspect of the invention relates to a cooking appliance comprising a housing and a muffle. The muffle is arranged in the housing. The muffle defines a cooking chamber of the cooking appliance. The cooking appliance further comprises a door movably mounted on the housing. The door is provided for closing the cooking chamber. The cooking appliance further comprises a flow channel system with which air drawn into the cooking appliance from the surroundings of the cooking appliance can be directed.

[0003] Such designs are known from the prior art. For example, reference may be made in this context to DE 102007 005 718 A1 and DE 102011 006 075 A1.

[0004] From EP 3 029 382 B1 a cooking appliance is known in which cooling air and media which are discharged from the cooking chamber are introduced into the cooking chamber.

[0005] From WO 2022 / 101 006 A1, a cooking appliance with a flow channel system is known in which air is sucked in from the environment under the muffle and this sucked-in air, used to cool components, is blown out again under the muffle.

[0006] In the known devices, the design of the flow channel system as well as a comprehensive air flow line for cooling the components on the one hand and for further needs-based use of air circulating in the cooking device on the other hand are limited.

[0007] It is an object of the present invention to provide a cooking appliance in which the air flowing in the cooking appliance is used more effectively.

[0008] This object is achieved by a cooking appliance having the features of claim 1. One aspect of the invention relates to a cooking appliance with a housing and a muffle. The muffle is arranged in the housing. A cooking chamber of the cooking appliance is delimited by the muffle. The cooking appliance furthermore has a door which is movably arranged on the housing. The door is designed to close the cooking chamber. It is therefore provided accordingly as intended and installed on the cooking appliance. Furthermore, the cooking appliance has a flow channel system. With this flow channel system, air introduced into the cooking appliance from the surroundings of the cooking appliance can be guided in a defined manner within the cooking appliance. The flow channel system has, in particular, flow channels through which the air flows to cool components of the cooking appliance, such as the door and the housing.

[0009] The cooking appliance has a drainage duct system. The drainage duct system is designed and thus installed and arranged as intended so that media can be discharged from the cooking chamber. In particular, these media are discharged from the cooking chamber thereby. These media are in particular vapors and / or smoke and / or steam. The drainage duct system is fluidically coupled to the flow duct system. This is done in particular in such a way that the media discharged from the cooking chamber can be introduced into the flow duct system. In particular, these media are introduced into the flow duct system. This recirculates the air from the cooking chamber into the flow duct system. In particular, this filtered cooking chamber air is made available in the flow duct system for further use in the cooking appliance.It is therefore intended that in at least one operating mode of the cooking appliance, this filtered, in particular purified, cooking chamber air, which is warmer than air from the surroundings of the cooking appliance, is not discharged from the cooking appliance in at least one partial air flow, but is returned to the cooking appliance for further circulation.

[0010] A filter device is arranged in the discharge duct system. With this filter device, the air or the media flow discharged from the cooking chamber can be filtered. This filter device therefore filters, in particular, the medium discharged from the cooking chamber. Such a cooking appliance makes it particularly advantageous to specifically and precisely clean the media that occur in the cooking chamber during cooking, which may contain fumes and / or smoke and / or steam. This ensures that the air flowing out of the cooking chamber in the discharge duct system downstream of the filter device is filtered and is therefore cleaner. This means that this cleaned air from the cooking chamber can continue to be used in the cooking chamber. This means that it does not have to be discharged directly from the cooking appliance.Rather, such purified air, which originates from the cooking chamber and is therefore warmer than the ambient air, can be used for additional purposes within the cooking appliance. This creates a cooking appliance that, on the one hand, improves the circulation of existing air within the cooking appliance and, on the other hand, increases the utilization and efficiency of the available air.

[0011] This is particularly advantageous when the cooking chamber air flowing through the discharge duct system and purified after passing through the filter device is returned to the flow duct system for further circulation, thus providing additional benefits. This is a particularly advantageous embodiment when the purified cooking chamber air is returned to the cooking chamber via the flow duct system. This creates a highly demand-oriented circulation process of the media flow discharged from the cooking chamber. This flow is cleaned by the filter device in the discharge duct system outside the cooking chamber and is then preferably recirculated into the cooking chamber via the return to the flow duct system.This has the particularly advantageous effect of creating a circulation system for the circulating air, which does not increase the concentration of the undesirable components of the media in the cooking chamber, in particular components of the vapors such as grease, steam and / or smoke, or at least keeps them the same, but rather reduces them due to the purified state. This is a particularly advantageous concept when this recirculated, purified cooking chamber air is used to remove the media present in the cooking chamber, in particular to push these media out of the cooking chamber by means of this introduced, recirculated and purified cooking chamber air. This is because it is precisely through this recirculation of the purified, but still heated or hot air that the energy in the cooking chamber can be essentially maintained, so that this recirculated air does not cause the cooking chamber to cool down undesirably.This also enables very energy-efficient operation, as the cooking appliance is not cooled down undesirably during this recirculation process, particularly in the cooking chamber, and therefore an undesirable amount of energy is not required to heat it back up to the desired temperature.

[0012] In one embodiment, the filter device has a catalyst. This is a very advantageous embodiment, as it allows the media generated in the cooking chamber during cooking to be filtered out particularly advantageously. A catalyst enables the removal, and in particular the decomposition, of specific media in a particularly advantageous manner. A catalyst is therefore a highly efficient unit for comprehensively and specifically removing specific media from the escaping media stream. Catalysis in particular can decompose or convert very specific substances so that they can be eliminated from this media stream in a particularly advantageous manner. This enables the cleaning process of this media stream emerging from the cooking chamber, or of the cooking chamber air, in a particularly advantageous manner.

[0013] In one embodiment, the catalyst comprises a catalytic filter. Furthermore, the catalyst comprises a heater. This allows vapors, which represent media in the cooking chamber, to undergo a catalytic reaction for combustion or neutralization. In particular, this can also convert corresponding odorous substances.

[0014] In one embodiment, the drainage channel system comprises a drainage channel. This channel has an inlet. This inlet is fluidically coupled to the cooking chamber on a ceiling wall of the muffle. This essentially drains the media located in the cooking chamber from the upper area of ​​the chamber. This is advantageous in that the media, which are already heated in the cooking chamber, rise upwards, making this position particularly advantageous for drainage.

[0015] In one embodiment, the discharge channel has an outlet. This is arranged below a bottom wall of the muffle, viewed in the vertical direction of the cooking appliance. In particular, this outlet of the discharge channel opens into the flow channel system. This creates a discharge channel that extends vertically, more or less outside the cooking chamber, over the entire height of the cooking chamber. In the flow direction of the media discharged from the cooking chamber, these are therefore transported from top to bottom in the discharge channel. It is therefore also provided that the flow channel system is also formed with at least partial regions, i.e. in particular with at least one flow channel, below the bottom wall of the muffle. Such a concept enables air to be discharged from the cooking appliance to the outside, even in a region below the muffle.Furthermore, the positioning of components of the flow channel system in this lower area below the muffle is compact and space-saving. Furthermore, the proposed concept enables the fluidic coupling of diverse systems and the resulting diverse and varied air distribution within the cooking appliance, achieved using the shortest possible paths. This allows even a very complex overall system for air distribution within the cooking appliance to be implemented as compactly and space-savingly as possible. It can thus be constructed with the shortest possible flow paths or with sub-channels adapted to the respective functionality and situation as required.

[0016] In one embodiment, the flow channel system comprises a main channel. This is located below a bottom wall of the muffle, as viewed in the vertical direction of the cooking appliance.

[0017] A fan for the cooking appliance is arranged in this main duct. This fan can be used to blow heated cooling air, which cools at least one component by flowing through the flow duct system and absorbs heat through this cooling, out of an outlet of the main duct. The main duct is therefore particularly defined in such a way that it can accommodate additional components that determine the air flow. Furthermore, the main duct is also functionally preferably defined by being larger geometrically and / or in terms of cross-section than other areas of the flow duct system. This not only allows for appropriate accommodation of the fan, but also enables the extensive routing of correspondingly larger air volumes.In particular, this facilitates the removal of air from the cooking chamber in a particularly advantageous manner, as this main duct has a larger cross-section than other sections of the flow channel system, allowing for simple and comprehensive air removal. By positioning this main duct specifically below the muffle, appropriate air removal can be achieved, particularly if the outlet is also advantageously located below the muffle. In particular, the main duct is also defined by the fact that it widens from the fan to the outlet. This facilitates air removal in a particularly advantageous manner and without air buildup.

[0018] In particular, this also allows for a relatively short path from the fan to the outlet of the main duct. In particular, a relatively short path section is created on the pressure side of the fan to transport the air to the outlet of the main duct. This is also advantageous for expelling even the largest possible air volumes quickly and as needed.

[0019] In one embodiment, the outlet is located at a front end, viewed in the depth direction of the cooking appliance, and below the bottom wall of the muffle. This allows cooling air to be blown out toward the front, viewed in the depth direction of the cooking appliance. This prevents unwanted air buildup, since the area in front of the cooking appliance is usually clear.

[0020] In one embodiment, the discharge duct system flows into the main duct on the suction side of the fan. This is another very advantageous embodiment because then this fan can not only convey the air in the flow duct system, but also automatically extracts the air from the cooking chamber via the discharge duct system and draw it into the flow duct system. Thus, air movement or flow initiation in several different duct systems of the cooking appliance can be achieved with a single fan. This minimizes the number of fans. This enables a particularly advantageous concept with regard to the number of components, a space-saving design of the duct systems, and a very needs-oriented and coordinated flow generation of air in the duct systems.

[0021] In one embodiment, the cooking appliance has a purge channel through which purge air can be introduced into the cooking chamber to blow out media from the cooking chamber. This purge channel is thus intended to specifically introduce a gaseous medium, namely purge air, into the cooking chamber in order to then at least assist in the removal, in particular the pressing out, of media contained therein. This enables a very efficient concept for purging the cooking chamber, in particular for removing vapors and / or steam and / or smoke from the cooking chamber.

[0022] In particular, the flushing channel is a separate channel from the discharge channel. The flushing channel is, in particular, a separate channel from the flow channel system, which is intended, at least primarily, for cooling components.

[0023] In one embodiment, this purge channel branches off from the main channel with an inlet on the pressure side of the fan. In one embodiment, the purge channel opens into the cooking chamber with an outlet. In particular, this outlet is arranged on a rear wall of the muffle. This advantageous position of the inlet or the corresponding coupling point of the purge channel with the main channel also makes it possible to return at least a portion of the air flowing in the main channel back into the cooking appliance in a particularly efficient manner. This point of the fluidic coupling between the purge channel and the flow channel system is therefore particularly advantageous. On the pressure side of the fan, the introduction into the purge channel is particularly simple, but on the other hand, it can be carried out in a very targeted and metered manner. This allows the portion of air flowing in the flow channel system, particularly on the pressure side of the fan, to be branched off in a very targeted manner.This achieves a particularly advantageous return of at least a portion of this airflow in the flow duct system downstream of the fan. Because this purge duct then flows directly back into the cooking chamber, a very short purge duct can be created. This particularly advantageously enables a circulating airflow created by the media in the cooking chamber, which are then discharged and filtered via the discharge duct system. This filtered, warm cooking chamber air is then coupled into the flow duct system via the coupling of the discharge duct system and the flow duct system. It is then decoupled from the flow duct system at a different location via the purge duct, which is different from the discharge duct system, and thus returned to the cooking chamber as a purified airflow.This essentially uses the cooking chamber air as purge air, yet still allows for a continuous reduction of vapors and / or smoke and / or steam in the cooking chamber, as the purified cooking chamber air used as purge air no longer increases the concentration of vapors and / or steam and / or smoke. Because of its purified state, it does not recirculate such components of the media or airflow back into the cooking chamber.

[0024] In one embodiment, the purge channel has a flow-limiting element. This flow-limiting element allows the flow of purge air through the purge channel to be adjusted. This is another very advantageous embodiment, as it not only enables a blanket supply of purge air but also achieves a very precise dosage as needed. In a particularly advantageous manner, this flow-limiting element also allows the purge channel to be completely blocked or closed. This allows the recirculation of air into the cooking chamber via this purge channel to be completely blocked in a specific operating mode.If, on the other hand, such a rinsing mode is desired and is to be carried out, the rinsing channel can be released in a defined manner via this flow restriction element, so that, depending on this, a specific proportion of air from the flow channel system can enter this rinsing channel and can be introduced into the cooking chamber as rinsing air in a timely and / or quantitatively dosed manner.

[0025] In one embodiment, the flow-restricting element can have an adjustable flap. This adjustable flap can be used to cover or uncover the inlet of the flushing channel. This flap can be moved, for example, by an actuator. This can be a relay, for example. A wax relay is possible. In one embodiment, the outlet of the flushing channel can be thermally decoupled from the rest of the channel. This can prevent thermal losses.

[0026] In one embodiment, the purge channel is fluidically coupled to the flow channel system, in particular a main channel of the flow channel system, in such a way that, in a purge mode, an air mixture of the heated cooling air from the flow channel system and the filtered cooking chamber air can be introduced into the cooking chamber as purge air. Particularly clean, yet very warm air is therefore used as purge air. The above-mentioned advantages are therefore achieved to a particularly high degree. In one embodiment, the filter device is arranged at an inlet of the discharge channel system. This means that the media from the cooking chamber are filtered virtually immediately after they exit the cooking chamber. This prevents unwanted contamination, particularly of the inner walls of the discharge channel system, with components of the medium, particularly those to be filtered.This is particularly advantageous in preventing grease or similar materials from accumulating on the inside of the drainage channel system.

[0027] In one embodiment, the flow channel system has an intake channel or inflow channel as the flow channel. This intake channel is designed and arranged for introducing cooling air from the surroundings of the cooking appliance. The intake channel is arranged above a ceiling wall of the muffle in the housing, particularly when viewed in the vertical direction of the cooking appliance. In one embodiment, this ensures that the intake channel is arranged above the preferably present main channel, when viewed in the vertical direction. This essentially means that cooler air from the surroundings, which is intended for cooling components, is sucked in in the upper region, whereas the air is blown out in the flow channel system, particularly via the main channel, in the lower region of the housing. This advantageously also separates these two central points of the flow channel system spatially, particularly in the vertical direction.This results in a very comprehensive cooling concept, on the one hand with regard to introducing the largest possible air volume, and on the other hand with regard to cooling components as comprehensively as possible.

[0028] The terms “top”, “bottom”, “front”, “back”, “horizontal”, “vertical”, “depth direction”, “width direction”, “height direction” etc. indicate the positions and orientations given when the device is used and arranged as intended.

[0029] Further features of the invention emerge from the claims, the figures and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respective combination specified, but also in other combinations without departing from the scope of the invention. Thus, embodiments are to be regarded as encompassed and disclosed by the invention that are not explicitly shown and explained in the figures, but which emerge and can be produced by separate combinations of features from the explained embodiments. Embodiments and combinations of features are also to be regarded as disclosed that therefore do not have all the features of an originally formulated independent claim.Furthermore, embodiments and combinations of features are to be regarded as disclosed, in particular by the embodiments set out above, which go beyond or deviate from the combinations of features set out in the reliances of the claims.

[0030] Embodiments of the invention are explained in more detail below with reference to schematic drawings. They show:

[0031] Fig. 1 is a schematic vertical sectional view through an embodiment of a cooking appliance according to the invention;

[0032] Fig. 2 is a perspective view of the cooking appliance according to Fig. 1 from the rear and without an outer casing;

[0033] Fig. 3 shows the representation of Fig. 2 in a different perspective to Fig. 2;

[0034] Fig. 4 is a perspective vertical sectional view of the arrangement in Fig. 2;

[0035] Fig. 5 is an enlarged view of a partial area in Fig. 4;

[0036] Fig. 6 is an enlarged view of a portion of Fig. 2 in a further perspective sectional view; and

[0037] Fig. 7 is a perspective view of a main channel of the flow channel system with a fan and a flushing channel branching off from the main channel.

[0038] In the figures, identical or functionally equivalent elements are provided with the same reference numerals. Figure 1 shows a schematic vertical sectional view of an embodiment of a cooking appliance 1. The cooking appliance 1 can be, for example, an oven, a steamer, or a microwave oven. It is also possible for the oven to also have a steamer function and / or a microwave oven function.

[0039] The cooking appliance 1 has a housing 2. The housing 2 has, in particular, an outer housing 3. A muffle 4 of the cooking appliance 1 is arranged in the housing 2 and thus received by the outer housing 3. The muffle 4 defines a cooking chamber 5 of the cooking appliance 1 with walls. For this purpose, the muffle 4 has a top wall 6 and a bottom wall 7. In addition, the muffle 4 can have a rear wall 8 and side walls (not shown or identified in detail). In particular, it is provided that a hot air box 9 of the cooking appliance 1 is arranged in front of the rear wall 8 in the depth direction (z-direction) of the cooking appliance 1. This is separated by a baffle 10 from the volume of the cooking chamber 5 in which the food 11 to be cooked is to be placed. A blower or fan 12 can be arranged in the hot air box 9. In particular, a heater 13 is also arranged therein.The baffle 10 preferably has holes through which the heated air moved by the heater 13 and the fan 12 can be introduced into the cooking chamber 5.

[0040] Furthermore, the cooking appliance 1 has a door 14. This door is arranged here for closing the front of the cooking chamber 5. In particular, it is movably mounted on the housing 2.

[0041] The cooking appliance 1 further comprises a flow channel system 15. This flow channel system 15 is also designed as a cooling channel system. With this flow channel system 15, air L1 from the environment 16 of the cooking appliance 1 can be introduced into the housing 2. For this purpose, the flow channel system 15 in the exemplary embodiment has an inflow channel 17. In the exemplary embodiment, this is arranged above the muffle 5 in the vertical direction (y-direction) of the household appliance for preparing food, namely the cooking appliance 1 in this case. In particular, this inflow channel 17 has an inlet 18, here in particular on the front. The intended purpose of this flow channel system 15 is to cool at least one component of the cooking appliance 1.As can be seen here, the sucked-in air L1 flows along the inlet channel 17, another flow channel 19 of the flow channel system 15, and a main channel 20 of the flow channel system 15, which is preferably present here, in the housing 2. Along this flow path, this air L1 absorbs heat from the components to be cooled, thereby cooling them. As a result, the air L1 enters the main channel 20 as warm air compared to its temperature in the surroundings 16.

[0042] In one exemplary embodiment, the cooking appliance 1 has a fan 22. This is embodied here, for example, as a radial fan 21. This fan 22 is a single fan of the flow channel system 15. The flow channel system 15 therefore has only this single fan 22. As can be seen in Fig. 1, in the exemplary embodiment, it is arranged below the muffle 4, in particular below the bottom wall 7 of the muffle 4, viewed vertically. It is positioned within the outer housing 3.

[0043] As can also be seen, the flow channel system 15, here in particular the main channel 20, has an outlet 23, particularly at the front. The air is blown out via this outlet 23.

[0044] Furthermore, the cooking appliance 1 has a drainage duct system 24. This drainage duct system 24 is intended and arranged, in particular at least primarily, to drain media from the cooking chamber 5. For this purpose, in the exemplary embodiment, the ceiling wall 6 has an opening 25. This opening 25 is fluidically coupled, in particular directly, to an inlet 26 of the drainage duct system 24. The opening 25 can also be the same as the inlet 26.

[0045] Furthermore, this discharge duct system 24 is fluidically coupled to the flow duct system 15, which is primarily intended for cooling. In particular, it is provided that the discharge duct system 24 opens into the flow duct system 15 via an outlet 27. In particular, one exemplary embodiment provides for this outlet 27 to open directly into the main duct 20. In particular, this opening is provided on a suction side 28 of the fan 22. In particular, this opening is therefore formed upstream of the fan 22 in the direction of air flow. As also shown in Fig. 1, a filter device 29 is arranged in the discharge duct system 24. This is intended to filter media L2 that are sucked out of the cooking chamber 5. This creates an air flow L3 downstream of the filter device 29 in the discharge duct system 24, which air flow L3 is purified or filtered compared to the media L2.The air flow L3 is thus a filtered, heated air flow of cooking chamber air. This air flow L3 is directed via the discharge duct system 24, which has a discharge duct 30, here in particular to the main duct 20. The discharge duct 30 runs at least partially in the vertical direction and thus, in the exemplary embodiment, from top to bottom. In particular, the filter device 29 is designed with a catalyst 31. In one exemplary embodiment, this catalyst 31 has a catalytic filter 32 (Fig. 6) and a heater 33 (Fig. 6). Preferably, this filter device 29 also has a grease filter 34, as is also shown in Fig. 6. Preferably, as is also shown in Fig. 6, insulation 35 is provided. This surrounds the catalytic filter 33 and the heater 34 in a ring-like manner.

[0046] In particular, it is provided that the cooking appliance 1 also has a flushing channel 36 (Fig. 1). This flushing channel 36 branches off from the flow channel system 15. In particular, it is provided that an inlet 37 of this flushing channel 36 branches off from the main channel 20 of the flow channel system 15. In particular, the flushing channel 36 is therefore not part of the flow channel system 15, which primarily conducts air for cooling components. In particular, it is provided that this flushing channel 36 branches off from the main channel 20 on a pressure side 38 of the fan 22. The flushing channel 36 therefore branches off after the fan 22, viewed in the direction of air flow in the main channel 20.

[0047] As can also be seen, the purge channel 36 has an outlet 39. This outlet 39 is fluidically coupled to the cooking chamber 5. In particular, this outlet 39 opens, in particular directly, into the cooking chamber 5 at the rear wall 8 of the muffle 4. This concept makes it possible for a partial flow L5 to be branched off from an air flow L4 flowing in the main channel 20, in particular on the pressure side 38, which flows in the purge channel 36 and is blown into the cooking chamber 5. It is advantageous that this air flow L5, which represents the purge air, is a gas mixture. This gas mixture is composed of the air flow L1 and the air flow L3. Since these two air flows L1 and L3 are brought together in the flow direction upstream of the inlet 37 in the main duct 20, this gas mixture is created on the suction side 28. In particular, the purge air is therefore very pure air, which is also heated extensively.In particular, at least a portion of the media L2 discharged from the cooking chamber 5, which is necessarily transferred by the filter device 29 into a cleaned or filtered air stream L3 of the cooking chamber air, is thus returned or recirculated into the cooking chamber 5.

[0048] In one embodiment, a flow-limiting element 40 can be provided. This flow-limiting element 40 can be used to adjust the flow of purge air through the purge channel 36. This flow-limiting element 40 can, for example, be an adjustable flap. It can be adjusted by an actuator. In particular, control via a control unit 41 of the cooking appliance 1 is also possible. The control unit 41 in Fig. 1 is shown only symbolically with regard to its position and other significance.

[0049] The control unit 41 can also control other components of the cooking appliance 1.

[0050] In particular, the filter device 29 is arranged maximally adjacent to the opening 25, in particular in the region of an inlet 26 of the discharge channel system 24.

[0051] Fig. 2 shows a perspective view of the cooking appliance 1 viewed from the rear. For clarity, the outer casing 3 has been removed. This allows the position and geometry of the discharge channel system 24 to be more clearly seen. As already schematically shown in Fig. 1, the vertically oriented flow channel 19 of the flow channel system 15 flows into the main channel 20 at a point 42. This is also indicated in Fig. 2.

[0052] Fig. 2 also shows further preferably present covers 43, 44 and 45. These surround the separate muffle 4 and delimit a space between the muffle 4, in which thermally insulating material 46 is arranged. Fig. 3 shows the arrangement of the components of the cooking appliance 1 according to Fig. 2, with Fig. 3 showing a perspective view from below and from the rear. In particular, the geometry of the main channel 20 can be seen here. In addition, the course of the flushing channel 36 is also shown here. In this respect, it is a separate channel from the main channel 20 and is fluidly coupled to the main channel 20 only via the inlet 37.

[0053] Fig. 4 shows the arrangement according to Fig. 2 and Fig. 3 in a perspective sectional view. The sectional plane here is formed by plane IV-IV in Fig. 2.

[0054] Fig. 5 shows an enlarged view according to section I in Fig. 4.

[0055] As already explained above, Fig. 6 shows an enlarged view of a perspective sectional view along the section line VI-VI in Fig. 2. The structure of the filter device 29 is explained in more detail here.

[0056] Fig. 7 is a perspective view of a portion of the flow channel system 15, in particular the main channel 20, viewed from above. The flow restriction element 40 is shown in the open state. This releases the inlet 37, and a partial air flow L5 of the air flow L4 can flow into the purge channel 36. As can be seen in Fig. 7, the flow restriction element 40, in its design as a pivotable flap, can be actuated by means of an actuator 47. The flow restriction element 40 preferably has a cantilevered web 48. A closure part 49 is arranged on this web. When the flow restriction element 40 is closed, the closure part 49 closes the inlet 37. This web 48 forms a guide element, with which the air flow L4 coming from the fan 22 is partially separated, thus enabling a directed supply to the inlet 37.This web 48 virtually dynamically extends the flushing channel 36 into the main channel 20 when this flow-limiting element 40 is open. This creates, in particular, a variable supply air channel, with which the air in the main channel 20 can be directed to the inlet 37 in a targeted manner. In particular, Fig. 7 also shows the wall structure, or rather a wall module 50, that delimits the main channel 20 downwards and laterally.

[0057] As can be seen, the flow channel system 15 and the discharge channel system 24 have only a single common fan 22. This is arranged below the muffle 4.

[0058] A rinsing mode of the cooking appliance 1 can be adjusted as needed by the control unit 41. For example, such a rinsing mode can be activated depending on a specific concentration of steam in the cooking chamber 5 and / or depending on a specific concentration of smoke in the cooking chamber 5 and / or depending on a specific concentration of vapors in the cooking chamber 5.

[0059] In a cooling mode of the cooking appliance 1, the flow channel system 15 can be activated and, in this regard, the fan 22 can be in operation, so that air L1 is drawn in for cooling. In such a cooling mode, it is possible for the flushing channel 36 to be closed, in particular by the flow-restricting element 40.

[0060] However, it can also be provided that the flushing channel 36 is minimally open in the cooling mode so that condensation in the cooking chamber 5 or in other areas can be better avoided. However, this is still not a flushing mode as explained above. Both the flow velocity and the air volume that enters the flushing channel 36 during this condensation prevention are too low to perform flushing as in the flushing mode. A flow can also be generated by an increase in the volume flow, for example due to the conversion of water to steam and / or of oil or fat to smoke, and can occur due to small leaks, for example in the area of ​​a seal 51 (Fig. 1), between the door 14 and a housing flange 52 (Fig. 1).If too much undesirable medium occurs in the cooking chamber 5 during cooking operation, for example too much vapor and, in this context, too much fat, the smoke produced during fat combustion activates the catalytic reaction in the filter device 29 if a catalyst 31 is present there. This then activates the heater 33. The efficiency of the catalyst 31 increases and additionally heats up. This process can reduce the pressure and the smoke in the cooking chamber 5 is reduced. On the other hand, if a purge mode is carried out, the inlet 37 of the purge channel 36 is opened by the flow restriction element 40. The air flow according to the purge air according to the partial air flow L5 then purges the cooking chamber 5 and smoke and other substances are expelled from the cooking chamber 5 via the opening 25.This process reduces the temperature of the catalyst 31, particularly the catalytic filter 32, and improves the smoke and odor elimination process.

[0061] This also makes it possible for the cooking appliance 1 to enable and offer cooking processes that also generate a relatively large amount of smoke. Such cooking processes can include grilling at very high temperatures, for example. Other cooking processes, such as drying fruit, can also be performed. During such a process, the pressure in the cooking chamber is approximately 2 Pa.

[0062] In particular, this also makes it possible for the outlet 39 to be adjustable in size, particularly in its passage, so that it can be set as needed during this process. This can prevent excessive pressure from building up in the cooking chamber 5 and unwanted leaks from occurring, for example via the seal 51. A functional interaction between the outlet 39 and the fan 12 in the hot air box 9 is also possible. In this context, the pressure generated by this fan 12 in the hot air box 9 can influence the effectiveness of this purging, and in particular reduce it. It is therefore particularly advantageous if this inlet 39 opens into the hot air box 9. This is also shown in the illustrations in Fig. 4 and Fig. 5.

[0063] The purge mode is particularly advantageous when static heating is used in the hot air box 9. This means that there is no convection by the fan 12. In particular, the purge mode can also be influenced by the speed of the fan 22.

[0064] In the aforementioned cooling mode, in which no rinsing mode is performed, the pressure in the cooking chamber 5 can be approximately fifteen Pa. In addition to the advantages mentioned above, it is also possible to prevent boilover at the end of a cooking process. This is especially true if the rinsing mode is activated and, in particular, the rinsing mode can be adapted as needed by the variably adjustable speed of the fan 22.

[0065] The cooking appliance 1 preferably has one or more sensors designed to detect the pressure in the cooking chamber 5 and / or to detect the concentration of smoke and / or vapors and / or steam in the cooking chamber 5. This sensor-detected information can be transferred to the control unit 41. Depending on this information, the control unit 41 can control the aforementioned processes and / or the aforementioned components.

[0066] List of reference symbols

[0067] Cooking appliance

[0068] Housing Outer housing Muffle

[0069] Cooking chamber

[0070] Ceiling wall

[0071] floor wall

[0072] back wall

[0073] Hot air box

[0074] baffle

[0075] Food

[0076] fan

[0077] Heating

[0078] door

[0079] Flow channel system environment inlet channel

[0080] Entrance

[0081] flow channel

[0082] main channel

[0083] Radial fan

[0084] fan

[0085] Exit

[0086] drainage channel system

[0087] opening

[0088] Entrance

[0089] Exit

[0090] Suction side filter device discharge channel

[0091] Catalyst 32 Filter

[0092] 33 Heating

[0093] 34 grease filters

[0094] 35 Insulation

[0095] 36 Flushing channel

[0096] 37 Entrance

[0097] 38 printed pages

[0098] 39 Exit

[0099] 40 Flow limiting element

[0100] 41 Control unit

[0101] 42 positions

[0102] 43 Cover

[0103] 44 Cover

[0104] 45 Cover

[0105] 46 thermally insulating material

[0106] 47 Actuator

[0107] 48 jetty

[0108] 49 locking part

[0109] 50 wall modules

[0110] 51 Seal

[0111] 52 Housing flange x Width direction y Height direction z Depth direction

[0112] L1 Air

[0113] L2 Media

[0114] L3 Airflow

[0115] L4 Airflow

[0116] L5 Partial air flow

[0117] Section I

Claims

Patent claims 1. Cooking appliance (1) with a housing (2) and with a muffle (4) arranged in the housing (2), wherein a cooking chamber (5) of the cooking appliance (1) is delimited by the muffle (4), and with a door (14) provided for closing the cooking chamber (5), and with a flow channel system (15) with which at least air (L1) from the environment (16) of the cooking appliance (1) can be conducted into the cooking appliance (1), and the air (L1) flows in flow channels (17, 19, 20) of the flow channel system (15) for cooling the door (14) and / or the housing (2), wherein the cooking appliance (1) has a discharge channel system (24) with which media (L2) can be discharged from the cooking chamber (5), wherein the discharge channel system (24) is fluidically connected to the flow channel system (15, in particular directly is coupled so that the media discharged from the cooking chamber (5) can be introduced into the flow channel system (15), characterized in that a filter device (29) is arranged in the discharge channel system (24),with which the media (L2) discharged from the cooking chamber (5) are filtered.

2. Cooking appliance (1) according to claim 1, characterized in that the filter device (29) has a catalyst (31).

3. Cooking appliance (1) according to claim 2, characterized in that the catalyst (31) has a catalytic filter (32) and a heater (33).

4. Cooking appliance (1) according to one of the preceding claims, characterized in that the discharge channel system (24) has a discharge channel (30) which is fluidically coupled, in particular directly, to the cooking chamber (5) via an inlet (26) on a ceiling wall (6) of the muffle (4).

5. Cooking appliance (1) according to claim 4, characterized in that the discharge channel (30) opens into the flow channel system (15) with an outlet (27) below a bottom wall (7) of the muffle (4).

6. Cooking appliance (1) according to one of the preceding claims, characterized in that the flow channel system (15) has a main channel (20) which is arranged below a bottom wall (7) of the muffle (4), and in which a fan (22) is arranged, with which at least the cooling air (L4) heated by the cooling can be blown out at an outlet (23) of the main channel (20).

7. Cooking appliance (1) according to claim 6, characterized in that the outlet (23) is arranged at a front end of the cooking appliance (1) and below the bottom wall (7), so that the heated cooling air can be blown out forwards as an air flow (L4) in the depth direction (z) of the cooking appliance (1).

8. Cooking appliance (1) according to claim 6 or 7, characterized in that the discharge duct system (24) opens into the main duct (20) on a suction side (28) of the fan (22).

9. Cooking appliance (1) according to one of the preceding claims, characterized in that the cooking appliance (1) has a rinsing channel (36) with which rinsing air (L5) for blowing out media (L2) from the cooking chamber (5) can be introduced into the cooking chamber (5).

10. Cooking appliance (1) according to one of the preceding claims 6 to 8 and according to claim 9, characterized in that the flushing channel (36) has an inlet (37) with which the flushing channel (36) branches off from the main channel (20) on the pressure side (38) of the fan (22), and the flushing channel (36) opens with an outlet (39) into the cooking chamber (5), in particular on a rear wall (8) of the muffle (4).

11. Cooking appliance (1) according to claim 9 or 10, characterized in that the flushing channel (36) has at least one flow limiting element (40) with which the flow of the flushing air (L5) through the flushing channel (36) can be adjusted.

12. Cooking appliance (1) according to claim 11, characterized in that the flow limiting element (40) has an adjustable flap with which the inlet (37) of the rinsing channel (36) can be covered or uncovered.

13. Cooking appliance (1) according to one of the preceding claims, characterized in that the rinsing channel (36) is connected to the flow channel system (15), in particular directly to a main channel (20) of the flow channel system (15), is fluidically coupled, so that in a rinsing mode an air flow (L4) as an air mixture of the heated cooling air and the filtered cooking chamber air can be introduced into the cooking chamber (5) as rinsing air (L5).

14. Cooking appliance (1) according to one of the preceding claims, characterized in that the filter device (29) is arranged at an inlet (26) of the discharge channel system (24).

15. Cooking appliance (1) according to one of the preceding claims, characterized in that the flow channel system (15) has an intake channel (17) as a flow channel for introducing cooling air as air (L1) from the environment (16) of the cooking appliance (1), which is arranged above a ceiling wall (6) of the muffle (4) in the housing (2).

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