Circulating air deflector for an extractor hood and extractor hood

Abstract

The present invention relates to a recirculation diverter for a cooker hood (1), wherein the recirculation diverter (2) comprises a lower part (20) with an air inlet opening (200), a closed upper part (21) and at least one air guide element (22). The recirculation diverter (2) is characterized in that the recirculation diverter (2) has a front and a rear opposite the front, as well as two sides extending between the front and rear, that the recirculation diverter (2) is at least partially open at the front and the two sides, that at least one air guide element (22) is at least partially curved forward, that one air guide element (22) is a barrier wall (220), that the barrier wall (220) extends between the upper part (21) and the lower part (20) and covers the gap between the upper part (21) and the lower part (20), and that the barrier wall (220) is arranged behind the air inlet opening (200).Furthermore, a range hood (1) with such a recirculation diverter (2) is described.

Description

[0001] The present invention relates to a recirculation diverter for a cooker hood and a cooker hood with a recirculation diverter.

[0002] In range hoods, air is drawn into the hood housing by a fan located within the housing and then expelled after passing through the fan. In range hoods operating in recirculation mode, the filtered air expelled from the hood housing typically flows into an air duct. From there, a diverter valve splits the airflow into two streams, which are then recirculated back into the kitchen. The diverter valve and its duct are located within a duct, sometimes referred to as a chimney. Slots are incorporated into the chimney at the air outlets of the diverter valve, allowing the air to escape.

[0003] Such a cooker hood with recirculation diverter is described, for example, in DE 101 188 881 A1.

[0004] The air flowing out of the sides of the extractor hood creates specific air currents in the kitchen environment. Depending on the ambient conditions, this can result in cross-currents between the cooktop and the extractor hood. Asymmetrical cross-currents, meaning currents where air flows more strongly from one side of the cooktop to the other, negatively impact the extractor hood's fume capture rate. The kitchen environment, or rather the surrounding area that influences the air exiting the extractor hood, includes, for example, walls located near the hood or other obstructions to the airflow, such as tall or wall cabinets mounted close to the hood. These walls or cabinet sides block the lateral airflow from the extractor hood, perpendicular to the direction of airflow.The outgoing air is therefore forced upwards and downwards by the room wall or the side wall of the cabinet. The downward portion of the airflow can create an asymmetrical or user-directed airflow above the cooktop, causing rising steam to be carried along laterally or forwards and thus preventing it from being extracted by the extractor hood. This impairs the extractor hood's steam capture rate. These airflow patterns are exemplified in [reference to diagram]. Figure 12 shown.

[0005] The present invention is therefore based on the objective of creating a solution by means of which the vapor capture rate of a cooker hood, in particular a cooker hood in recirculation mode, can be improved.

[0006] According to a first aspect, the invention therefore relates to a recirculation diverter for a range hood, wherein the recirculation diverter comprises a lower part with an air inlet opening, a closed upper part, and at least one air guide element. The recirculation diverter is characterized in that it has a front and a rear opposite the front, as well as two sides extending between the front and rear, that the recirculation diverter is at least partially open at the front and on the two sides, that at least one air guide element is at least partially curved forward, that one air guide element forms a barrier, that the barrier extends between the upper and lower parts and covers the gap between the upper and lower parts, and that the barrier is arranged behind the air inlet opening.

[0007] Directional terms such as front, back, top, and bottom refer—unless otherwise defined—to the air recirculation diverter and its components in a mounted state. The back of the air recirculation diverter is the side facing the wall to which it is attached. The front is the side opposite the back wall. The sides, that is, the lateral surfaces of the air recirculation diverter, extend between the front and back. In the mounted state, the upper and lower parts are preferably positioned horizontally.

[0008] The components of the recirculation diverter, in particular the upper part, the lower part, and the at least one air guide element, as well as any additional connecting elements and / or frames provided according to the invention, can be manufactured as a single part. However, according to a preferred embodiment, the upper part and the lower part are designed as separate components that are connected to each other. In this embodiment, the at least one air guide element can, for example, be attached to the upper part or the lower part, or be formed integrally with the upper part or lower part.

[0009] According to the invention, a recirculation diverter is a device by which an airflow entering the device can be redirected. Furthermore, in the recirculation diverter, the incoming airflow is split into at least two differently directed airflows. The redirection of the incoming airflow can, for example, be 90°.

[0010] According to the invention, a kitchen extractor hood that can be mounted above a cooktop is referred to as a range hood. In a preferred embodiment, the range hood is a so-called wall-mounted hood, the back of which is attached to a wall in the kitchen. The range hood preferably comprises an extractor housing, an air duct, and a chimney. The extractor housing contains the fan of the range hood. An extraction opening is located in the extractor housing, particularly in its underside, through which air can be drawn from the space above the cooktop and enter the extractor housing. An air duct can be connected to the extractor housing in the direction of airflow downstream of the fan. The air duct can be a rigid or flexible pipe.The air duct can be attached to an outlet nozzle located on the extractor hood housing and preferably extends upwards from the extractor hood housing. The air duct can be contained within a chimney. The chimney preferably covers the air duct at the front and sides. In addition to the air duct, the extractor hood housing can also be contained within the chimney. In this embodiment, the underside of the chimney can form the extraction opening, or a vapor screen can be attached to the underside of the chimney, in which the extraction opening is formed. The underside of the extractor hood housing or the chimney can be horizontal or inclined upwards. In the latter embodiment, the extractor hood can also be referred to as a head-free hood or an angled hood.

[0011] The recirculation diverter according to the invention is preferably arranged in the chimney of a range hood and is directly connected to the air duct or the range hood housing. Range hoods with a chimney can also be referred to as decorative range hoods. However, the range hood can also be designed without a chimney. Furthermore, the recirculation diverter can also be mounted directly on the range hood housing, meaning that there is no air duct between the range hood housing and the recirculation diverter. The recirculation diverter according to the invention can also be used in a range hood that is integrated into a kitchen wall cabinet.

[0012] According to the invention, the recirculation diverter comprises a lower part, an upper part, and at least one air guide element. The lower part has an air inlet opening. Preferably, the lower part has a base body, which in the simplest case can be a flat plate. The air inlet opening can be formed in the surface of the lower part, particularly in the base body. Preferably, a connecting piece adjoins the base body downwards. The connecting piece can be a tube with a constant diameter. In this case, the air inlet opening is formed by an opening in the base body, particularly a plate, which preferably has the same diameter as the tube of the connecting piece. Alternatively, instead of the tube with a constant diameter, the connecting piece can have a funnel shape at the transition to the base body.In this case, the air inlet opening is located at the height from which the diameter of the connecting piece increases upwards. In this embodiment, the air inlet opening can be located below the underside of the base body. The connecting piece of the recirculation diverter is preferably rounded in its upper region to minimize flow separation at the lateral outlets of the recirculation diverter.

[0013] The lower part, and in particular the base body, preferably has a rectangular shape. The width and depth of the lower part, and in particular the base body, preferably correspond to the width and depth of the chimney in which the air diverter is arranged.

[0014] The air inlet opening can be located in the middle of the depth of the lower part, in particular the base body. However, according to one embodiment, the air inlet opening is positioned further forward from the center of the lower part, in particular the base body.

[0015] According to the invention, the upper part of the recirculation diverter is a closed upper part. This means that the upper part has no opening through which air can escape from the recirculation diverter. The upper part can comprise a base body. In one embodiment, the upper part consists of the base body. In the simplest embodiment, the base body, like the base body of the lower part, is a plate. The upper part, and in particular the base body, preferably has a rectangular shape. The width and depth of the upper part, and especially of the base body, preferably correspond to the width and depth of the lower part and, more preferably, to the width and depth of the chimney in which the recirculation diverter is arranged.

[0016] The recirculation diverter has a front and a back opposite the front, as well as two sides extending between the front and back. The front can also be referred to as the first side, the back as the second side, and the sides extending between them as the third and fourth sides. When the recirculation diverter is installed in the extractor hood, and particularly in the extractor hood's chimney, the back, i.e., the second side, of the recirculation diverter faces the back of the chimney. The back of the chimney is preferably open. Therefore, the back of the recirculation diverter preferably rests against the wall to which the extractor hood is attached. In the installed state, the front and sides of the recirculation diverter face the front and sides of the chimney, respectively, and preferably rest against these chimney walls.

[0017] According to the invention, the air recirculation diverter is open at least partially on the front and both sides. Preferably, the front is completely open and the sides are open at least in their front area.

[0018] According to the invention, the recirculation diverter comprises at least one air guide element. The air guide element is arranged between the upper and lower parts of the recirculation diverter. An air guide element is defined as an element that directs the airflow in the recirculation diverter in a predetermined direction. In one embodiment, only a single air guide element is arranged in the recirculation diverter. In other embodiments, however, more than one air guide element is arranged in the recirculation diverter, and these elements may have different configurations.

[0019] According to the invention, at least one air guide element is at least partially curved forward. The curvature can be located at the lateral end of the air guide element where it abuts one of the sides of the recirculation diverter. The air guide element, which is at least partially curved forward, can be a baffle or an air guide element. It is therefore possible that the baffle is a flat plate and at least one of the air guide elements is curved, or that the baffle has a curvature and no air guide elements or only flat air guide elements are provided. However, it is particularly preferred that both the baffle and any air guide elements provided each have a forward curvature.

[0020] According to the invention, an air guide element is a baffle. A baffle is defined as a wall that separates at least one area of ​​the recirculation diverter from another area of ​​the recirculation diverter. The baffle can therefore also be called a partition. According to the invention, the baffle extends between the upper and lower parts and covers the gap between them. In a preferred embodiment, the baffle extends in a vertical direction.

[0021] According to the invention, the baffle is arranged behind the air inlet opening. A baffle is defined as being arranged behind the air inlet opening if it is located in the area between the air inlet opening and the rear side, i.e., the second side of the lower part. Because the baffle is not located within the surface of the air inlet opening, but rather offset to the rear, it is ensured that all air exiting the air inlet opening reaches the sides and front of the recirculation diverter and can exit through them. Furthermore, a baffle can create a rear, enclosed space within the recirculation diverter. A mounting device for attaching the recirculation diverter to a wall can be arranged within this enclosed space.

[0022] The baffle can be a single-piece wall. In this case, the baffle can be attached to the upper and / or lower part of the recirculation diverter, or be formed integrally with the upper or lower part. However, it is also within the scope of the invention for the baffle to be designed in two parts. In this embodiment, an upper part of the baffle can be attached to the upper part and a lower part of the baffle to the lower part, and the baffle can be formed by joining the upper and lower parts.

[0023] The baffle preferably has a width that is at least equal to the diameter of the air inlet opening. Particularly preferably, the width of the baffle corresponds to the width of the lower part and, more preferably, to the width of the recirculation diverter.

[0024] The baffle thus blocks the airflow in the recirculation diverter from the air intake opening towards the rear, that is, towards the back of the diverter. The air flowing out of the air intake opening is therefore at least partially directed by the baffle to the sides of the recirculation diverter.

[0025] Since at least one air guide element is at least partially curved forward, the recirculation diverter according to the invention prevents the air exiting the diverter from flowing towards the sides of the diverter, and thus also towards the sides of the chimney, parallel to the rear of the diverter and therefore parallel to the wall to which the extractor hood is attached. This prevents the airflow from being blocked by a side wall or a side cabinet wall, and thus prevents cross currents from forming above the cooktop. Furthermore, the air outlet openings on the chimney can be limited to the front area of ​​the chimney's side walls. In addition, the fact that the recirculation diverter is open at the front and on both sides offers the advantage of a lower pressure drop compared to simply blowing air forward.By separating the rear section from the front section of the recirculation diverter with a baffle, preferably a vertical wall, the rear section is rendered virtually airflow-free. In particular, there is no forced convection flow. This prevents air from the air duct from flowing backwards against the wall of the recirculation diverter and creating additional turbulence in the outlet area.

[0026] In addition to the at least one air guide element, one or more connecting elements may be provided between the upper and lower parts. In particular, connecting ribs or pins may be provided at the front corners of the recirculation diverter, by means of which the upper and lower parts can be attached to each other in a multi-part recirculation diverter design, and can be kept at a distance from each other in a one-piece recirculation diverter design.

[0027] According to a preferred embodiment, the baffle is adjacent to the air inlet opening. This means that the baffle is arranged tangentially to the rear of the air inlet opening. In the embodiment where the lower part of the recirculation diverter has a connecting piece that extends downwards from the base body and tapers downwards, the air inlet opening is located at the level where the connecting piece has its smallest diameter. In this embodiment of the lower part, the baffle therefore has a downward-extending projection that extends into the downward-tapering transition area of ​​the connecting piece.

[0028] By positioning the baffle against the air intake opening, the flow of air exiting the air intake opening to the rear can be completely prevented. This prevents turbulence, which would otherwise develop with a baffle or rear wall that is offset from the air intake opening.

[0029] Preferably, the baffle is curved forward, at least in its lateral end regions. This directs the air flowing horizontally to the sides of the recirculation diverter forward before it exits the diverter. According to one embodiment, the baffle has a rearward-curved section between the center and the lateral, forward-curved end regions. The rearward-curved section and the forward-curved section can adjoin each other, thus forming a continuous curve extending from the center, which may have a varying radius of curvature along its path.

[0030] According to one embodiment, the recirculation diverter has, in addition to the baffle, at least two air guide elements, which are air guide elements. The air guide elements extend between the upper and lower parts. In particular, the air guide elements each cover the gap between the upper and lower parts. According to one embodiment, the air guide elements extend vertically. Furthermore, the air guide elements each extend between the air inlet opening and one side of the recirculation diverter, that is, one of the third or fourth sides of the recirculation diverter. Each of the air guide elements has a forward-curved area at least at its lateral end. Preferably, the forward-curved area extends over the entire width of the air guide element. The air guide elements preferably take the form of louvers. The air guide elements can also be referred to as lateral air guide elements.

[0031] By incorporating lateral air guide elements, the sideways airflow in the recirculation diverter is redirected forward before exiting it. This prevents air from flowing against and accumulating against side walls or cabinets, thus reducing or eliminating cross-drafts on the cooktop.

[0032] According to one embodiment, two of the air guide elements are front and side air guide elements, each extending from the edge of the air inlet opening to a transition between the front and an adjacent side, in particular a third or fourth side. In particular, the front side air guide element of a rectangular recirculation diverter can extend from the air inlet opening to a front corner. This allows, on the one hand, a reliable forward-directed airflow to be discharged over the sides of the recirculation diverter and, on the other hand, prevents turbulence with the air flowing from the air inlet opening to the front of the recirculation diverter.

[0033] According to a further embodiment, the recirculation diverter has, in addition to the baffle and a front air guide element, at least one middle air guide element. A middle air guide element is defined as an air guide element that is arranged between the baffle and the front air guide element. The middle air guide element also extends from the edge of the air inlet opening to one of the sides, in particular the third or fourth side of the recirculation diverter.

[0034] Preferably, the further, central air guide element has a curvature that differs from the curvature direction of the front air guide element. In particular, the central air guide element has a radius of curvature that differs from the radius of curvature of the front air guide element. For example, the radius of curvature of the front air guide element can be larger than the radius of curvature of the central air guide element. However, it is also within the scope of the invention that the front air guide element and one or more central air guide elements have the same radius of curvature. According to the invention, more than one central air guide element can be arranged between the front air guide element and the bulkhead.

[0035] The center of the radius of curvature of the air guide elements lies in front of the air guide element and can, for example, be located at or in front of the front of the recirculation diverter.

[0036] The air guide elements are of such a length that they cover the distance between the air inlet opening and the adjacent side, third or fourth side of the recirculation diverter. However, it is also within the scope of the invention for the length of the air guide element to be less than this distance. In this case, the air guide elements are preferably spaced apart from the side of the recirculation diverter, but still abut the air inlet opening. Preferably, the air guide elements do not project into the air inlet opening. However, it is also within the scope of the invention for the air guide elements to project at least partially into the air inlet opening.

[0037] According to a preferred embodiment, the upper part of the recirculation diverter has a recess in the middle of its width, extending from the front of the upper part to the rear. The recess can begin at the front or at a distance from the front of the recirculation diverter. According to a preferred embodiment, the recess extends to the rear of the recirculation diverter. The recess is oriented such that it lies at least partially above the air inlet opening.

[0038] According to one embodiment, the recess forms a rounded channel with a rounded front face. In particular, the front face is shaped like a portion of a conical wall. The airflow from the air inlet opening, coming from below, adheres to the rounded channel and is directed to the lateral outlets of the recirculation diverter. The front, air-exposed part of the upper section is conical, so that the airflow from the air inlet opening adheres to its surface and is directed to the front outlet on the front of the recirculation diverter.

[0039] By providing a recess in the upper part, the air flowing from the air inlet opening is divided into two lateral airflows. Preferably, by having the front of the recess form part of a conical wall, a forward-directed airflow can be generated in addition to the lateral airflows.

[0040] According to a preferred embodiment, the distance of the air inlet opening to the front of the recirculation diverter is less than its distance to the rear of the recirculation diverter.

[0041] According to one embodiment, the recirculation diverter has a mounting element attached to the rear of the upper and / or lower part. This mounting element can be connected to a support bracket attached to the wall where the extractor hood is mounted, thus enabling the recirculation diverter to be installed.

[0042] According to another aspect, the invention relates to a cooker hood which has a recirculation diverter according to the invention.

[0043] Advantages and features described with regard to the recirculation diverter apply - where applicable - accordingly to the extractor hood and vice versa.

[0044] In one embodiment, the extractor hood has a chimney for accommodating the extractor hood's housing. In this embodiment, the recirculation diverter is arranged within the chimney. In a preferred embodiment, the chimney has air outlet openings on the front and both sides, and the recirculation diverter is arranged at the level of the air outlet openings within the chimney.

[0045] The air outlet openings can be, for example, slots, square or round openings.

[0046] Preferably, the air outlet openings in the side surfaces of the chimney are arranged only in the front area.

[0047] The invention is described again below with reference to the accompanying figures. These show: Figure 1: a schematic, perspective top view of a first embodiment of the recirculation diverter according to the invention; Figure 2: a schematic, perspective top view of the lower part of the recirculation diverter of the first embodiment according to Fig. 1 Figure 3: a schematic, perspective top view of the upper part of the recirculation diverter of the first embodiment according to Fig. 1 Figure 4: a schematic, perspective bottom view of the upper part of the recirculation diverter of the first embodiment according to Fig. 1 Figure 5: a schematic, perspective top view of the lower part of a second embodiment of the recirculation diverter according to the invention; Figure 6: a schematic, perspective top view of a third embodiment of the recirculation diverter according to the invention; Figure 7: a schematic, perspective top view of the lower part of the recirculation diverter of the third embodiment according to the invention. Fig. 6Figure 8: another schematic, perspective top view of the lower part of the recirculation diverter of the third embodiment according to Fig. 6 Figure 9: a schematic block representation of an embodiment of a range hood according to the invention; Figure 10: a schematic, perspective top view of the chimney of an embodiment of the range hood according to the invention; Figure 11: a schematic representation of the flow from a range hood according to the invention; and Figure 12: a schematic representation of the flow from a range hood according to the prior art.

[0048] In Figures 1 to 4A first embodiment of a recirculation diverter 2 according to the present invention is shown. The recirculation diverter 2 comprises a lower part 20 and an upper part 21. The lower part 20 of the illustrated embodiment consists of a base body 202 in the form of a plate and a connecting piece 201 extending downwards from the base body 202. The connecting piece 201 has a round cross-section. In its upper region, the connecting piece 201 widens upwards. The transition from the tubular lower part of the connecting piece 201 to the base body 202 of the lower part 20 is rounded. In the illustrated embodiment, the upper part 21 also comprises a base body 211, which is a plate. A recess 210 is provided in the upper part 21. The recess 210 extends downwards from the base body 211, that is, towards the lower part 20. The recess 210 is offset backwards at a distance from the front of the upper part 21.In the illustrated embodiment, the recess 210 extends to the rear side of the upper part 21. In its front region, the recess 210 has the shape of part of a conical surface. Further along, the recess 210 forms a V-shaped groove. The transitions of the recess 210 to the base surface and the apex of the V-shape of the groove are each rounded.

[0049] Between the lower part 20 and the upper part 21, as in Figure 2An air guide element 22 is visibly arranged. The air guide element 22 constitutes a baffle 220. In the illustrated embodiment, the baffle 220 consists of two parts. The lower part is attached to or integrally formed with the lower part 20 of the recirculation diverter 2, and the upper part is attached to or integrally formed with the upper part 21 of the recirculation diverter 2. The baffle 220 extends between the upper part 21 and the lower part 20 and covers the gap between the upper part 21 and the lower part 20. It is also within the scope of the invention that the baffle 220 is designed as a single piece.

[0050] The baffle 220 is arranged at the rear edge of the air inlet opening 200 of the lower part 20. The air inlet opening 200 is defined here as the cross-section of the tubular part of the connecting piece 201 of the lower part 20, that is, the cross-section before the diameter increases towards the base body 202 of the lower part 20. To bridge the transition area of ​​the connecting piece 201, the baffle 220 has a projection 2201 on its underside, which extends into the transition area of ​​the connecting piece 201.

[0051] At its lateral ends, the barrier wall 220 has a forward-curved area 2200. In the illustrated embodiment, the barrier wall 220 is curved first backwards and then forwards from its center.

[0052] The barrier wall 220 extends across the entire width of the lower part 20.

[0053] A fastening element 3 is provided on the back of the recirculation diverter 2, via which the recirculation diverter 2 can be attached to a room wall.

[0054] In the first embodiment, a connecting element 23 is arranged at each of the front corners of the lower part 20. In the embodiment shown, connecting elements 23 are additionally provided on the upper part 21. Furthermore, in the first embodiment, a frame 212 is arranged on the upper part 21. The connecting elements 23 are arranged at the front corners of the frame 212 and extend downwards from the frame 212. The upper part 21 and the lower part 20 can be connected to each other via the connecting elements 23.

[0055] In Figure 5A lower part 20 of a second embodiment is shown. This embodiment differs from the first embodiment only in that the recirculation diverter 2 has additional air guide elements 22 besides the baffle 220. The additional air guide elements 22 are air guide elements 221, which are arranged at the transition between the front and one of the sides of the recirculation diverter 2. The air guide elements 221 are therefore also referred to as front, lateral air guide elements. In particular, the air guide elements 221 are curved louvers, each extending from one of the front corners of the lower part 2 to the air inlet opening 200 of the lower part 20. In the embodiment shown, the air guide elements 221 are arranged on the connecting elements 23 and extend inwards from the respective connecting element 23 to the air inlet opening 200.The air guide elements 221 each have a shape curved forward from the air inlet opening 200. In the illustrated embodiment, the height of each air guide element 221 at the end adjacent to the air inlet opening 200 is greater than the height at the end located at the front corner of the recirculation diverter 2. This causes the air guide element 221 to project into the transition area of ​​the connecting piece 201. This ensures controlled guidance of the airflow exiting the air inlet opening 200.

[0056] The upper part 21 of the second embodiment of the recirculation diverter 2 corresponds to the upper part 21 of the first embodiment of the recirculation diverter 2.

[0057] In the Figures 6 to 8A third embodiment of the recirculating air diverter 2 according to the invention is shown. The third embodiment differs from the second embodiment in that a further air guide element 222, which can also be referred to as a middle or middle side air guide element 222, is arranged between the front, lateral air guide element 221 and the baffle 220. Each of the middle air guide elements 222 extends from the air inlet opening 200 to one of the sides of the lower part 20. The middle air guide elements 222 are curved forward. The curvature of the middle air guide elements 222 corresponds to the curvature of the front, lateral air guide elements 221. The upper part 21 of the third embodiment corresponds to that of the first embodiment.

[0058] In the first and second embodiments of the recirculation diverter, the deflection of the airflow is less pronounced than in the third embodiment due to the absence of central air guide elements. The first and second embodiments are therefore preferably suitable for use with a range hood when there are no obstructions such as wall cabinets or similar structures on either side of the range hood and, in particular, the recirculation diverter.

[0059] In Figure 9Figure 1 shows an embodiment of the extractor hood 1 according to the invention. The extractor hood 1 has an extractor housing 10 in which the fan (not shown) is housed. An air duct 11 connects to the extractor housing 10 and leads to a recirculation diverter 2. In the embodiment shown, the extractor housing 10, the air duct 11, and the recirculation diverter 2 are housed in a chimney 12. A viewing hood 13 is arranged on the underside of the chimney 12. In the embodiment shown, the viewing hood 13 is arranged horizontally. However, it is also within the scope of the invention for the viewing hood 13 to be arranged inclined upwards relative to the horizontal. In this embodiment, the extractor hood 1 is a slanted hood.

[0060] In Figure 10The upper section of a range hood 1 is shown. The recirculation diverter 2 is located in the upper section of the chimney 12. At the level of the recirculation diverter 2, air outlet openings 120 in the form of slots are provided in the front and both side walls of the chimney 12. In the front, the slots extend across the entire width of the chimney. In the side walls of the chimney 12, the air outlet openings 120 are provided only in the front section. In the embodiment shown, the recirculation diverter 2 is attached to a mounting bracket, which is mounted on the wall, via the fastening element 3.

[0061] In Figure 11 The flow from a recirculation diverter 2 according to the invention is shown schematically. In particular, in Figure 11The airflow from the recirculation diverter 2 is illustrated using streamlines. The airflow is shown at a volume flow rate of 450 m³ / h. As this illustration shows, the exhaust airflow from the recirculation diverter 2 fans out forwards and to the sides. This ensures that no airflow encounters lateral obstructions, such as cabinets or walls, and is directed straight onto the cooktop. Simultaneously, this fanning of the exhaust airflow reduces the maximum air velocities in the room, which can lead to backdrafts and consequently to cross currents above the cooktop.

[0062] Figure 12This schematically illustrates the airflow from a recirculation diverter according to the state of the art, where air is only discharged laterally via the diverter. The air is deflected by the diverter at a 90° angle to both sides. Depending on the kitchen environment, the exiting airflow can cause strong cross currents between the extractor hood and the cooktop. Obstructions on the sides of the extractor hood, perpendicular to the airflow direction, such as tall cabinets, wall units, or other surfaces, can cause an asymmetrical airflow or an unwanted airflow directed towards the user above the cooktop. Figure 12This shows a specific kitchen environment with resulting cross-drafts. On the left side of the extractor hood is a wall cabinet that forces the airflow exiting the recirculation diverter, parallel to the wall, downwards onto the worktop. Due to the asymmetrical airflow patterns, a cross-draft is created above the hob from left to right, which can carry away the rising steam and impair the steam capture rate.

[0063] The present invention offers several advantages. The targeted and optimized airflow in the recirculation diverter according to the invention prevents direct airflow towards objects, such as room walls or cabinet walls, on both sides of the diverter. Separating the rear section of the recirculation diverter from the airflow path prevents additional turbulence and the resulting noise. Pressure loss is reduced by the openings at the front and in the front section of the sides. The spreading of the exhaust airflow reduces high room air velocities and the resulting cross currents above the cooktop. With the present invention, these cross currents can be minimized or completely eliminated in a wide variety of kitchen environments, particularly those with obstructions to the sides of the extractor hood.In the design of the recirculation diverter according to the invention, particularly in the airflow areas, it is also possible to minimize the pressure loss caused by the redirection of the airflow. Furthermore, the low room air velocities reduce user discomfort in the kitchen environment caused by noticeable drafts. The vertically oriented air guide elements prevent visibility through the recirculation diverter, resulting in a clearly dark interior. Reference symbol list

[0064] 1 Extractor hood 10 Extractor housing 11 Air duct 12 Chimney 120 Air outlet 13 Viewing hood 2 Recirculation diverter 20 Base 200 Air inlet 201 Connecting piece 202 Base body 21 Top body 210 Recess 211 Base body 212 Frame 22 Air guide element 220 Partition 2200 Curved area 2201 Projection 221 Front air guide element 222 Middle air guide element 23 Connecting element 3 Fastening element

Claims

1. Recirculation diverter for a cooker hood (1), wherein the recirculation diverter (2) has a lower part (20) with an air inlet opening (200), a closed upper part (21) and at least one air guide element (22), characterized by that the recirculation diverter (2) has a front and a rear opposite the front, as well as two sides extending between the front and rear, that the recirculation diverter (2) is at least partially open at the front and on both sides, that at least one air guide element (22) is at least partially curved forwards, that an air guide element (22) represents a barrier wall (220), that the bulkhead (220) extends between the upper part (21) and the lower part (20) and covers the gap between the upper part (21) and the lower part (20) and that the bulkhead (220) is located behind the air inlet opening (200).

2. Recirculation diverter according to claim 1, wherein the barrier wall (220) is arranged adjacent to the air inlet opening (200).

3. Recirculation diverter according to claim 1 or 2, wherein the barrier wall (220) is curved forward at least in its lateral end regions (2200).

4. Recirculation diverter according to claims 1 to 3, wherein the recirculation diverter (2) has at least two air guide elements (22) which are air guide elements (221, 222), cover the distance between the upper part (21) and lower part (20), each extend between the air inlet opening (200) and one side of the recirculation diverter (2) and each have a forward-curved area at least at the lateral end.

5. Recirculation diverter according to claim 4, wherein two of the air guide elements are front air guide elements (221) which each extend from the edge of the air inlet opening (200) to a transition between the front and the adjacent side of the recirculation diverter (2).

6. Recirculation diverter according to claim 5, wherein the recirculation diverter (2) has a further, central air guide element (222) between each front air guide element (221) and the partition (220), which extends from the edge of the air inlet opening (200) to one of the sides of the recirculation diverter (2).

7. Recirculation diverter according to claim 6, wherein the further, middle air guide element (222) has a curvature that differs from the curvature direction of the front air guide element (221).

8. Recirculation diverter according to one of claims 1 to 7, wherein the upper part (21) of the recirculation diverter (2) has a recess (210) in the middle which extends from the front of the upper part (21) to the rear.

9. Recirculation diverter according to one of claims 1 to 8, wherein the lower part (20) has a downwardly extending and tapered connecting stub (201) whose smallest diameter forms the air inlet opening (200), the barrier wall (220) has a downwardly extending projection (2201) and the projection (2201) extends into the downwardly tapered area of ​​the connecting stub (201) of the lower part (20).

10. Recirculation diverter according to one of claims 1 to 9, wherein the distance of the air inlet opening (200) to the front of the recirculation diverter (2) is less than the distance to the rear of the recirculation diverter (2).

11. Recirculation diverter according to one of claims 3 to 10, wherein the (220) barrier wall has a rearward curved area between the center of the barrier wall (220) and the lateral, forward-curved end regions (2200).

12. Air recirculation diverter according to one of claims 1 to 11, wherein the air recirculation diverter (2) has a fastening element (3) which is attached to the rear of the upper part (21) and / or lower part (20).

13. Extractor hood, characterized by the fact that the extractor hood (1) has a recirculation diverter (2) according to one of claims 1 to 12.

14. Extractor hood according to claim 13, wherein the extractor hood (1) has a chimney (12) for receiving an extractor housing (10), the recirculation diverter (2) is arranged in the chimney (12), the chimney (12) has air outlet openings (120) on the front and both sides, and the recirculation diverter (2) is arranged at the level of the air outlet openings (120) in the chimney (12).

15. Extractor hood according to claim 14 wherein the air outlet openings (120) in the sides of the chimney (12) are arranged only in the front area.

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