Extraction device of a cooking hob

Abstract

The invention relates to a trough exhaust device (10) with an exhaust housing (12) which can be used for exhaust air operation and for recirculation air operation. In order to advantageously further develop a generic device, it is proposed that the exhaust housing (12) has a receiving chamber (14) for optionally receiving a recirculation air filter unit (16) and a flow barrier (18) for recirculation air operation.

Description

[0001] The present invention relates to a downdraft extraction device according to claim 1, a cooktop with a downdraft extraction device according to claim 14 and a method for mounting a downdraft extraction device according to claim 15.

[0002] A downdraft extractor, also known as a cooktop extractor or downdraft range hood, is a system integrated into a cooktop that draws cooking fumes downwards. The fumes are extracted at their source, preventing them from spreading throughout the room. The challenge with this type of extractor is to draw the warm, rising fumes and associated odors downwards using a fan. Downdraft extractors are typically operated in either ducted or recirculating mode. In ducted mode, the extracted air, along with the cooking fumes, is vented to the outside via a building exhaust duct. In recirculating mode, the extracted air is filtered and recirculated back into the room.The airflow pattern within the downdraft extractor differs between exhaust air operation and recirculation operation in that the extracted air must be passed through a recirculation filter during recirculation operation.

[0003] Downdraft extractors are known to operate in both recirculation and exhaust modes. Whether the extractor operates in recirculation or exhaust mode is typically determined during installation. The airflow within the extractor is configured for either exhaust or recirculation mode during installation. In recirculation mode, it is particularly important to prevent so-called "lost air," which is released back into the room without passing through the recirculation filter. When installing a downdraft extractor for recirculation mode, or when converting a downdraft extractor that was previously operated in exhaust mode to recirculation mode, all extracted air should be routed through the recirculation filter. This results in different airflow patterns within the downdraft extractor between recirculation and exhaust modes.The extracted air containing the vapors is subsequently referred to as exhaust air.

[0004] To avoid unnecessarily restricting the storage space available to the user under the cooktop, the downdraft extractor should be designed to be as flat as possible. Furthermore, the airflow within the downdraft extractor should be designed to minimize resistance in order to achieve high extraction performance while simultaneously avoiding disruptive noise.

[0005] The invention is based, in particular but not limited to, the objective of advantageously further developing a generic device. This objective is achieved by the features of claims 1, 14 and 15, while preferred embodiments and further developments of the invention can be found in the dependent claims and the description.

[0006] The invention relates to a trough extraction device with an extraction housing which can be used for exhaust air operation and for recirculation air operation.

[0007] It is proposed that the extraction housing have a receiving space for the optional intake of a recirculation filter unit and a flow barrier for recirculation operation.

[0008] This allows for the provision of a significantly improved downdraft extractor. In particular, the airflow within the extractor housing can be optimally defined for both recirculating and exhaust air operation. The airflow within the downdraft extractor can therefore be designed with minimal flow resistance and low noise for both operating modes. Reduced flow resistance can lead to lower energy consumption during operation of the downdraft extractor, especially when used in exhaust air mode.

[0009] The downdraft extractor can be part, in particular a subassembly, of a downdraft extractor, wherein the downdraft extractor, in particular the downdraft extractor, can additionally include a fan, in particular comprising a fan wheel and a fan motor for driving the fan wheel, a control unit and / or an operating unit. The downdraft extractor can be designed for integration into a cooktop and in particular can be part of the cooktop. The fan can be designed as a radial fan or as an axial fan. The downdraft extractor, and in particular the downdraft extractor, is designed to extract and / or filter cooking fumes and / or vapors.

[0010] Recirculation mode is, in particular, a mode in which the extracted air, along with cooking fumes and / or vapors (i.e., the exhaust air), is filtered through a recirculation filter unit to return it to the room free of odors that would bother the user. Exhaust air mode is, in particular, a mode in which the exhaust air is released to an outside of the room, preferably without passing through the recirculation filter unit via ductwork to the outside.

[0011] The option to optionally include the recirculation filter unit and the flow barrier can mean, in particular, that when installing the downdraft extractor, the recirculation filter unit and the flow barrier can optionally be placed in the intake area to provide recirculation mode. The option to optionally include the recirculation filter unit and the flow barrier can also mean, in particular, that during installation, optionally neither the recirculation filter unit nor the flow barrier is placed in the intake area, thereby providing exhaust air mode.

[0012] The intake space is, in particular, a compartment whose dimensions and arrangement within the exhaust housing are designed to accommodate the recirculating air filter unit and the flow barrier. The intake space can form a free space during exhaust operation.

[0013] The flow barrier forms a barrier to airflow and can, in particular, be designed to be non-flowable. The flow barrier is preferably configured to direct the exhaust air to the recirculation filter unit during recirculation mode and is intended, in particular, to prevent air from flowing around the recirculation filter unit. In an advantageous embodiment, the flow barrier is configured to direct the exhaust air from an upstream area of ​​the exhaust housing to the recirculation filter unit during recirculation mode.

[0014] The downdraft extractor can include the recirculation filter unit and / or the flow barrier for recirculation mode. Alternatively, the recirculation filter unit and / or the flow barrier can be provided as accessories for the downdraft extractor.

[0015] The extractor hood can be designed to allow for the removal of the recirculation filter unit and the flow barrier. Therefore, in addition to optionally accommodating the recirculation filter unit and the flow barrier for recirculation mode, the extractor hood can also allow for the removal of both components. This enables easy replacement of the recirculation filter unit and the flow barrier. Furthermore, after initial installation for recirculation mode, the extractor hood can be easily converted for exhaust air operation. Additionally, removing the flow barrier for exhaust air operation opens up an area for the exhaust air flow path.

[0016] The recirculation filter unit can include a recirculation filter section. This section can function as an odor filter and / or a humidity filter. The odor filter can, for example, consist of an activated carbon filter and / or a zeolite filter. The recirculation filter unit can absorb odor molecules from the exhaust air, thus eliminating kitchen odors. The recirculation filter unit can have a first recirculation filter section and a second recirculation filter section, which can be designed separately. This allows the recirculation filter unit to be configured for a split airflow path within the extractor hood. For example, the first recirculation filter section can filter the exhaust air from the left side of the airflow path, and the second recirculation filter section can filter the exhaust air from the right side of the airflow path.

[0017] The exhaust housing can have a grease filter receiving chamber for a grease filter unit, which is arranged upstream of the receiving chamber within the exhaust housing. The grease filter receiving chamber allows for the provision of the grease filter unit, particularly to prevent contamination of the trough exhaust device by grease and oil particles during operation. The grease filter receiving chamber is, in particular, a space whose dimensions and arrangement within the exhaust housing are designed to accommodate the grease filter unit. The grease filter receiving chamber can adjoin an external surface outside the exhaust housing. The grease filter receiving chamber can be adjacent to the receiving chamber. The trough exhaust device can incorporate the grease filter unit. The grease filter unit can comprise a first grease filter section and a second grease filter section, which are designed separately from each other.The first grease filter section and the second grease filter section can be arranged at an angle to each other.

[0018] The grease filter unit can remove grease and oil particles from the exhaust air, particularly to prevent the downdraft extractor from becoming clogged. The grease filter unit can be made at least partially of paper, non-woven fabric, and / or metal. It can include a mesh filter, a sieve filter, a net filter, a baffle filter, a baffle filter, a grid filter, an expanded metal filter, a metal knitted filter, a metal woven filter, and / or any other filter that a person skilled in the art would consider appropriate. The grease filter unit can be cleanable. In particular, the grease filter unit can be dishwasher-safe. "Dishwasher-safe" can mean that the grease filter unit can withstand a large number of wash cycles, for example, at least 400 wash cycles, in a dishwasher without being damaged.

[0019] The flow barrier can be integrated into the housing to define an airflow path between the grease filter unit and the recirculation filter unit during recirculation mode. Integrating the flow barrier in this way can optimize airflow within the extractor housing for recirculation mode, particularly to prevent unwanted air from bypassing the recirculation filter unit. Furthermore, a shorter airflow path can be defined for exhaust air mode than for recirculation mode. Specifically, an area between the recirculation filter unit and the grease filter unit can be opened for airflow during exhaust air mode. The extractor housing can define an installation position for the flow barrier within the housing such that, during recirculation mode, the flow barrier defines an airflow path between the grease filter unit and the recirculation filter unit.

[0020] The recirculation filter unit can be positioned at a distance from the grease filter unit within the intake chamber. This allows unimpeded airflow through the grease filter unit. The exhaust housing can define an installation position for the recirculation filter unit within the intake chamber, ensuring that it is positioned at a distance from the grease filter unit. The exhaust housing can also define the installation positions of the recirculation filter unit and the flow barrier within the intake chamber in such a way that the grease filter unit, housed within the grease filter intake chamber, is unobstructed and airflow is permitted through it.

[0021] The recirculation filter unit and the flow barrier can be inserted into and removed from the extractor housing together, and in particular simultaneously. This allows for easy replacement of the recirculation filter unit and the flow barrier. The user can insert and / or remove the recirculation filter unit and the flow barrier from the extractor housing with a single movement. Similarly, converting the operation of the downdraft extractor from recirculation to exhaust air operation is simplified. The recirculation filter unit and the flow barrier can be connected. The flow barrier can be inserted into and removed from the extractor housing like a drawer. In particular, the flow barrier can be slid in and out like a drawer. The flow barrier can accommodate the recirculation filter unit. The recirculation filter unit and the flow barrier can be detachably connected.The flow barrier can accommodate the recirculation filter unit in such a way that the recirculation filter unit and the flow barrier are detachably connected.

[0022] The exhaust housing may have an inlet opening for receiving exhaust air and for inserting and removing the recirculation filter unit and the flow barrier. The inlet opening may have dimensions larger than the smallest dimension of the recirculation filter unit and / or the flow barrier. The inlet opening may also be designed for inserting and removing the grease filter unit from the exhaust housing. The flow barrier may be designed to slide in and out of the inlet opening, similar to a drawer, when being inserted, and / or to slide out towards the inlet opening when being removed.

[0023] The recirculation filter unit can have a recirculation filter section with an edge section that is integrally formed with the flow barrier. This integral design allows the user to grasp the flow barrier and remove it, along with the recirculation filter unit, from the extractor housing. This simplifies handling when replacing the recirculation filter unit, which is usually difficult to grip. The edge section can include a protruding tab. This protruding tab makes it particularly easy for the user to grasp the recirculation filter unit. The protruding tab can form at least part of the flow barrier. The edge section of the recirculation filter section can include an edge banding. The tab and the edge banding can be made of the same material, which simplifies manufacturing.The edge banding can be designed to hold individual parts of the recirculation filter section together.

[0024] Furthermore, it is proposed that the trough exhaust device include a safety guard located in the exhaust housing below the intake chamber. This safety guard prevents the user from reaching into an area of ​​the exhaust housing where there is a risk of injury. In particular, it is intended to prevent the user from entering such an area with their fingers. A risk of injury exists especially if the user's fingers reach into the area of ​​a fan. To remove the recirculation filter unit, the user must reach inside the exhaust housing. In doing so, the user must partially reach blindly for the recirculation filter unit, as the interior of the exhaust housing is barely visible. The safety guard located below the intake chamber can prevent the user from injuring themselves by accidentally reaching inside during such a blind operation.

[0025] The intrusion guard can be designed as a flow-through structure. It can also be designed as a load-bearing structure. The intrusion guard can comprise elongated sections arranged at regular intervals, forming openings. Alternatively or additionally, the intrusion guard can have a perforated panel. The intrusion guard can include an intrusion grille for supporting the recirculation filter unit and the flow barrier during recirculation mode. This allows for a compact downdraft extractor, maximizing kitchen storage space for the user, particularly below the extractor.

[0026] The access grid can have a first grid section and a second grid section, the first grid section being located closer to the inlet opening and having a smaller grid spacing than the second grid section. The grid spacing can be defined as the uniform distance between the grid-like elongated parts. The first grid section can have openings in a uniform pattern. These openings can have dimensions and / or shapes that prevent the penetration of a user's fingers. The second grid section can have openings in a uniform pattern. These openings can have dimensions and / or shapes that prevent the penetration of a user's hands.

[0027] The first grille section can be covered by the flow barrier. This allows the flow barrier, which rests on the first grille section, to be drawn against it by a negative pressure generated during operation. The flow barrier can therefore be held in position without any special supports. This enables a particularly simple and compact design of the fume hood housing.

[0028] The exhaust housing can have a fan compartment for housing the fan. The fan compartment can be located below the grease filter compartment. This arrangement simplifies airflow to the fan compartment, particularly during exhaust operation. The fan compartment can be positioned so that its upper boundary is defined by the first grille section. The exhaust housing can have an outlet section for venting the exhaust air to an outer surface of the housing. The outlet section can be formed around the fan compartment. The outlet section can be spiral-shaped, particularly in the form of a helical casing.The exhaust housing can be formed by an upper housing part, a middle housing part, and a lower housing part, wherein the upper housing part and the middle housing part enclose a receiving chamber, and the middle housing part and the lower housing part enclose the blower receiving chamber and the outlet section. The upper housing part and the middle housing part can also enclose the grease filter receiving chamber.

[0029] Furthermore, a cooktop with a downdraft extractor is proposed. The cooktop can have a cooktop surface. The cooktop surface can have a cooktop opening. The cooktop opening allows the downdraft extractor to be integrated into a central area of ​​the cooktop surface. The downdraft extractor can draw the exhaust air through the cooktop opening. Alternatively, the downdraft extractor can also be integrated into the cooktop next to the cooktop surface. The dimensions and / or shape of the cooktop opening can correspond, in particular, to the dimensions and / or shape of the inlet opening of the extractor housing. The cooktop opening and the inlet opening can, in particular, be arranged to overlap. The cooktop can have an inlet insert that partially covers the cooktop opening. This prevents kitchen utensils from falling into the cooktop opening.

[0030] Furthermore, a method for assembling a trough extraction device is proposed, which has an extraction housing that can be used for exhaust air operation and for recirculation operation, wherein for recirculation operation a recirculation filter unit and a flow barrier are placed in a receiving space of the extraction housing.

[0031] The term "configured" means specially equipped and / or programmed. The phrase "configured" means that a unit is set up to perform a specific function, and that the unit actually performs this function in at least one operating state.

[0032] The terms "above", "below", "below" and "above" refer to the usual installation position of the trough drain device. These terms are to be understood in particular with regard to the direction of gravity.

[0033] The devices, systems, and methods disclosed herein are not limited to the application and embodiment described above. In particular, they may, to achieve a functionality described herein, comprise a different number of individual elements, components, units, and process steps than those specified herein. Furthermore, values ​​within the specified limits of the value ranges stated herein are also considered disclosed and freely usable.

[0034] It is specifically pointed out that all features and properties described in relation to a device, as well as methods, are transferable analogously to processes and usable within the scope of the invention and are considered to be jointly disclosed. The same applies in reverse. This means that structural, i.e., device-related, features mentioned in relation to processes can also be considered, claimed, and likewise included in the disclosure within the scope of the device claims.

[0035] The present invention is described below by way of example with reference to the accompanying figures. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and use them meaningfully in combination within the scope of the claims.

[0036] If more than one instance of a particular object exists, only one of them may be identified with a reference symbol in the figures and description. The description of this instance can then be applied to the other instances of the object. If objects are named using numerical terms, such as first, second, third object, etc., these serve to identify and / or classify objects. Thus, for example, a first object and a third object, but not a second object, may be included. However, numerical terms could also indicate a number and / or sequence of objects.

[0037] They show: Fig. 1 a perspective sectional view of a cooktop with a downdraft extractor, wherein a left half of the sectional view shows the downdraft extractor for exhaust air operation and a right half of the sectional view shows the downdraft extractor for recirculation operation, Fig. 2 a perspective sectional view of a cooktop with a downdraft extractor according to a further embodiment, wherein a left half of the sectional view shows the downdraft extractor for exhaust air operation and the right half of the sectional view shows the downdraft extractor for recirculation operation.

[0038] Figure 1Figure 1 shows a cooktop 50 with a downdraft extractor 10 in a perspective sectional view. The left half L of the sectional view shows the downdraft extractor 10 for ducted extraction operation, and the right half R of the sectional view shows the downdraft extractor 10 for recirculating operation. The in Figure 1The downdraft extractor 10 shown is therefore not ready for either recirculation or exhaust air operation in the depicted state. This combined representation was chosen to show the downdraft extractor 10 for exhaust air operation in the left half L and for recirculation air operation in the right half R for the sake of simplicity, so that the differences between exhaust air and recirculation air operation are easily apparent. The downdraft extractor 10 shown is largely mirror-symmetrical about a vertical plane, so that the combined representation depicts the downdraft extractor 10 completely. For recirculation air operation, the recirculation filter unit 16 and flow barrier 18 shown in the right half R are likewise mirror-symmetrical about the vertical plane in the left half R.For exhaust air operation, there is no recirculation filter unit 16 and no flow barrier 18, equally mirror-symmetrical to the vertical plane in the left half L.

[0039] The cooktop 50 has a cooktop plate 52 with a cooktop opening 56. The cooktop 50 also includes an inset insert 56, which partially covers the cooktop opening 54 to prevent kitchen utensils from falling into the cooktop opening 54.

[0040] The downdraft extractor 10 comprises an extractor housing 12, which can be used for both exhaust air operation and recirculation operation. The extractor housing 12 has a receiving chamber 14 for optionally accommodating a recirculation filter unit 16 and a flow barrier 18 for recirculation operation, thereby allowing for optimal airflow guidance within the extractor housing 12 for both exhaust air operation, as shown in the left half L, and recirculation operation, as shown in the right half R. In the present embodiment, the downdraft extractor includes, by way of example, the recirculation filter unit 16 and the flow barrier 18 for recirculation operation, as shown in the right half R. The airflow guidance within the downdraft extractor 10 can thus be designed to be as free of resistance and as quiet as possible for both operating modes.

[0041] The trough extraction device 10 is, by way of example, a sub-assembly of a trough extraction device, wherein the trough extraction device in particular additionally has a further sub-assembly which includes a drive unit for drawing in exhaust air.

[0042] In this case, recirculation mode is a mode in which the extracted air, along with cooking fumes and / or vapors (i.e., the exhaust air), is filtered by the recirculation filter unit 16 to return it to a surrounding room free of unpleasant odors. A right-hand flow path SR of the exhaust air formed during recirculation mode is represented by arrows in the right half R.

[0043] In contrast, exhaust air operation is an operation in which the exhaust air is discharged through a duct (not shown) to an outside of the surrounding room without passing through the recirculation filter unit 16. A left-hand flow path SL of the exhaust air formed during exhaust air operation is indicated by arrows in the left half L.

[0044] The intake chamber 14 is a construction space whose dimensions and arrangement within the exhaust housing 12 are designed to accommodate the recirculation filter unit 16 and the flow barrier 18, as shown in the right half R of Figure 1 shown, to record. As in the left half L of Figure 1 As shown, the recording chamber 14 forms a free space in the exhaust air operation.

[0045] The exhaust housing 12 shown in the example comprises, in addition to the intake chamber 14, a grease filter intake chamber 20, a blower intake chamber 36, and an outlet section 38. The exhaust housing 12 is formed by an upper housing part 40, a middle housing part 42, and a lower housing part 44. The upper housing part 40 and the middle housing part 42 enclose the intake chamber 14 and the grease filter intake chamber 20. The middle housing part 42 and the lower housing part 44 enclose the blower intake chamber 36 and the outlet section 38. The blower intake chamber 36 is located below the grease filter intake chamber 20 and below the intake chamber 14. The left flow path SL and the right flow path SR each run sequentially through the grease filter intake chamber 20, the intake chamber 14, the blower intake chamber 36, and the outlet section 38.The right flow path SR differs from the left flow path SL in that it is diverted through the flow barrier 18 to the recirculation filter unit 16 in the intake area 14. The left flow path SL flows through the intake chamber 14 without diversion and is shorter than the right flow path SR.

[0046] The recirculation filter unit 16 comprises the recirculation filter section 24, which in this case is, for example, an activated carbon odor filter designed to absorb odor molecules from the exhaust air. The recirculation filter unit 16 includes the recirculation filter section 24 as a first recirculation filter section and a second recirculation filter section (not shown), which are designed separately from each other. The second recirculation filter section (not shown) is arranged symmetrically to the first recirculation filter section with respect to the vertical plane.

[0047] The grease filter receiving chamber 20 is designed to receive a grease filter unit 21 and is arranged in the extractor housing 12 upstream of the receiving chamber 14. In the present embodiment, the downdraft extractor 10 includes, by way of example, the grease filter unit 21. The grease filter unit 21 can prevent the downdraft extractor 10 from becoming soiled by grease and oil particles during operation. The grease filter receiving chamber 20 adjoins the receiving chamber 12 and borders an outer surface outside the extractor housing 12, adjacent to the cooktop opening 54. In this embodiment, the grease filter receiving chamber 20 includes, by way of example, the grease filter unit 21. The grease filter unit 21 comprises a first grease filter section 21a and a second grease filter section 21b. The grease filter unit 21 is, by way of example, made of metal.

[0048] The flow barrier 18 is accommodated in the receiving chamber 14 and, as shown in the right half R, is an example of a component of the downdraft extraction device 10, defining the right flow path SR between the grease filter unit 21 and the recirculation filter unit 16 in recirculation mode. This is particularly evident from a comparison between the left half L and the right half R and the various left and right flow paths SL, SR shown therein. The flow barrier 18 optimizes the flow paths SL, SR for the desired operation. In recirculation mode, as shown in the right half R, the flow barrier 18 is positioned so that the right flow path SR passes through the recirculation filter unit 16, thus filtering the exhaust air. In exhaust air mode, as shown in the left half L, the left flow path SL through the free receiving chamber 14 is less curved and runs directly.The left flow path SL during exhaust air operation is therefore shorter than the right flow path SR during recirculation mode. The extractor housing 12 defines an installation position for the flow barrier 18 in the receiving chamber 14 such that, during recirculation mode, the flow barrier 18 defines the right flow path SR between the grease filter unit 21 and the recirculation filter unit 16.

[0049] The recirculation filter unit 16 can be arranged at a distance from the grease filter unit 21 in the receiving chamber 14 and, as shown in the right half R, is arranged at a distance from the grease filter unit 21 in the receiving chamber 14. This spacing allows the exhaust air to flow freely through the grease filter unit 21. Without the distance between the grease filter unit 21 and the recirculation filter unit 16, ensured by the flow barrier 18, the right flow path SR would not be optimal in recirculation mode. The extractor housing 14 defines an installation position for the recirculation filter unit 16 and the flow barrier 18 in the receiving chamber 14 such that the grease filter unit 21, which is housed in the grease filter receiving chamber 20, is freely accessible for airflow.

[0050] The exhaust housing 12 shown as an example is designed for the removal of the recirculation filter unit 16 and the flow barrier 18, thus allowing for both optional insertion and removal. The recirculation filter unit 16 and the flow barrier 18 can be inserted into and removed from the exhaust housing 12 together. For this purpose, the recirculation filter unit 16 and the flow barrier 18 are connected to each other. The flow barrier 18 can be inserted into and removed from the exhaust housing 12 in a drawer-like manner. The flow barrier 18 receives the recirculation filter unit 16 in such a way that the recirculation filter unit 16 and the flow barrier 18 are detachably connected.

[0051] The extractor housing 12 has an inlet opening 22 for receiving the exhaust air and for inserting the recirculation filter unit and the flow barrier 18 into the extractor housing 12, and for removing the recirculation filter unit 16 and the flow barrier 18 from the extractor housing 12. The dimensions and shape of the inlet opening 22 correspond to the dimensions and shape of the cooktop opening 54. The inlet opening 22 and the cooktop opening 54 essentially overlap completely.

[0052] The blower mounting chamber 36 is designed to accommodate a blower (not shown in its entirety). The blower comprises a blower wheel 46, a drive unit (not shown), and a control unit (not shown). The exemplary blower is designed as a radial blower, drawing in exhaust air in a vertical direction parallel to a rotational axis 48 of the blower wheel 46, and conveying the exhaust air radially to the rotational axis 48 of the blower wheel 46 to the outlet section 38.

[0053] The trough exhaust device 10 further comprises an access guard 28. The access guard 28 is arranged in the exhaust housing 12 below the receiving chamber 14 and is designed as a flow-through and load-bearing structure. The access guard 28 comprises elongated sections 29, which are arranged at uniform intervals and form first and second openings 31, 33. The access guard 28 includes an access grille 30 for supporting the recirculation filter unit 16 and the flow barrier 18 in recirculation mode. The access grille 30 comprises a first grille section 32 and a second grille section 34, wherein the first grille section 32 is arranged closer to the inlet opening 22 and has a smaller grille spacing than the second grille section 34. The first grille section 32 has the first openings 31 in a uniform pattern, and the second grille section 34 has the second openings 33 in a different uniform pattern.The first and second openings 31, 33 are designed in such a way that the flow through the intrusion guard 28 can be as loss-free as possible and at the same time the user is protected from injuries when reaching into the interior of the fume hood housing 12, for example from injuries from contact with the blower wheel 46.

[0054] As in the right half R of the Figure 1As shown, the first grille section 32 can be covered by the flow barrier 18 and is shown covered by the flow barrier 18. When exhaust air is drawn in, a negative pressure is generated by the rotating fan wheel 46, which draws the flow barrier 18 against the first grille section 32. The flow barrier 18 is thus held in position without any special supports. The fan housing 36 is arranged such that it is bounded at the top by the first grille section 32, which prevents the user from reaching vertically into the fan housing 36.

[0055] The outlet section 38 is designed to discharge the exhaust air to an outer surface of the exhaust housing 12. The outlet section 38 is spirally shaped around the fan housing 36 and directs the exhaust air, which is emitted radially from the fan wheel 46 to the axis of rotation 48, to a rear side. For exhaust operation, the outlet section 38 can be connected to a building exhaust duct via piping to discharge the exhaust air to the outside.

[0056] Figure 2Figure 1 shows a perspective sectional view of a cooktop 50 with a downdraft extractor 10 according to a further embodiment, wherein the left half L of the sectional view shows the downdraft extractor 10 for exhaust air operation and the right half R of the sectional view shows the downdraft extractor 10 for recirculation operation. The downdraft extractor 10 according to the further embodiment largely corresponds to the downdraft extractor 10 described above, except that a recirculation filter unit 16 and a flow barrier 18 differ from the previous embodiment. Reference can also be made to the above descriptions. The presentation also corresponds to the previously used presentation.

[0057] The recirculation filter unit 16 comprises, in addition to the previously described recirculation filter unit 16, a recirculation filter section 24 with an edge section 26 that is integrally formed with the flow barrier 18. The edge section 26 includes a projecting tab 27, which exemplifies the flow barrier 18. The edge section 26 also includes an edge band 25 that holds individual parts of the recirculation filter section 24 together. The tab 27 and the edge band 25 are exemplarily made of the same material. The projecting tab allows the user to easily grip the recirculation filter unit 16 and to replace the recirculation filter unit 16 together with the flow barrier 18 particularly easily. The use of the same material simplifies manufacturing.

[0058] The preceding description shows how the trough exhaust device 10 is mounted in a method for mounting it. In this process, during recirculation operation, the recirculation filter unit 16 and the flow barrier 18 are placed in the receiving chamber 14 of the exhaust housing 12. Reference sign

[0059] 10. Extractor hood 12. Extractor housing 14. Intake chamber 16. Recirculation filter unit 18. Flow barrier 20. Grease filter intake chamber 21. Grease filter unit 21a. First grease filter section 21b. Second grease filter section 22. Inlet opening 24. Recirculation filter section 26. Edge section 27. Tab 28. Intrusion guard 29. Elongated sections 30. Intrusion grille 31. First openings 32. First grille section 33. Second openings 34. Second grille section 36. Blower intake chamber 38. Outlet section 40. Upper housing part 42. Middle housing part 44. Lower housing part 46. Blower wheel 48. Shaft of rotation 50. Cooktop 52. Cooktop plate 54. Cooktop opening 56. Inlet insert Left half Right half SL. Left flow path S. Right flow path

Claims

1. Extraction device (10) with an extraction housing (12) which is suitable for exhaust air operation and for recirculation air operation, characterized by the fact that the extraction housing (12) has a receiving space (14) for optionally receiving a recirculation filter unit (16) and a flow barrier (18) for recirculation operation.

2. Trough discharge device (10) according to claim 1, characterized by the fact that the extraction housing (12) is designed for the removal of the recirculation filter unit (16) and the flow barrier (18).

3. Trough discharge device (10) according to claim 1 or 2, characterized by the fact that the exhaust housing (12) has a grease filter receiving chamber (20) for receiving a grease filter unit (21), which is arranged in the exhaust housing (12) upstream of the receiving chamber (14).

4. Trough discharge device (10) according to claim 3, characterized by the fact thatthe flow barrier (18) is to be accommodated in the receiving space (14) in order to define a flow path (SR) between the grease filter unit (21) and the recirculation filter unit (16) in the recirculation mode.

5. Trough discharge device (10) according to claim 3 or 4, characterized by the fact that the recirculation filter unit (16) can be arranged at a distance from the grease filter unit (21) in the receiving chamber (14).

6. Trough discharge device (10) according to one of the preceding claims, characterized by the fact that the recirculation filter unit (16) together with the flow barrier (18) can be inserted into and removed from the exhaust housing (12).

7. Trough discharge device (10) according to one of the preceding claims, characterized by the fact thatthe exhaust housing (12) has an inlet opening (22) for receiving exhaust air and for inserting the recirculation filter unit (16) and the flow barrier (18) into the exhaust housing (12) and for removing the recirculation filter unit (16) and the flow barrier (18) from the exhaust housing (12).

8. Trough discharge device (10) according to one of the preceding claims, characterized by the recirculation filter unit (16) and the flow barrier (18), which are connected to each other.

9. Trough discharge device (10) according to claim 8, characterized by the fact that the recirculation filter unit (16) has a recirculation filter section (24) with an edge section (26) which is formed integrally with the flow barrier (18).

10. Trough discharge device (10) according to one of the preceding claims, characterized by an intrusion guard (28) which is arranged in the extraction housing (12) below the receiving chamber (14) and is designed to allow flow through it.

11. Trough discharge device (10) according to claim 10, characterized by the fact that The intrusion guard (28) has an intrusion grid (30) for carrying the recirculation filter unit (16) and the flow barrier (18) in recirculation mode.

12. Trough discharge device (10) at least according to claims 7 and 11, characterized by the fact that the intervention grid (30) has a first grid section (32) and a second grid section (34), wherein the first grid section (32) is arranged closer to the inlet opening (20) and has a smaller grid spacing than the second grid section (34).

13. Trough discharge device (10) at least according to claim 12, characterized by the fact that the first grid section (32) can be covered by the flow barrier (18).

14. Hob (50) with a downdraft extraction device (10) according to one of the preceding claims.

15. Method for mounting a trough extraction device (10), in particular according to one of claims 1 to 13, which has an extraction housing (12) that is usable for exhaust air operation and for recirculation air operation, characterized by the fact that For recirculation operation, a recirculation filter unit (16) and a flow barrier (18) are placed in a receiving chamber (14) of the extraction housing (12).

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