Circulating air diverter for an extractor hood and extractor hood

Abstract

The present invention relates to a recirculation diverter (11) for a range hood (1), wherein the recirculation diverter (11) has an air inlet opening (110) and at least one air outlet opening (111) inclined towards the air inlet opening (110). The recirculation diverter (11) is characterized in that a noise reduction device (2) is arranged on at least a portion of a flow surface (112) of the recirculation diverter (11) that is opposite the air inlet opening (110).

Description

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

[0002] In extractor hoods, air is drawn into the housing by a fan (also called a ventilator) and expelled after passing through the housing. Extractor hoods can operate in two different modes: ducted extraction and recirculation. In recirculation mode, the filtered air expelled from the housing typically flows into an air duct. From there, a diverter valve splits the airflow into two or more streams, or redirects it, and these streams are then returned to the kitchen. An extractor hood can be a type of range hood.

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

[0004] When the extractor fan is in operation, it produces outflow noises that are perceived as unpleasant by the user.

[0005] The present invention therefore aims to provide a solution by which the emission of noise during the operation of the extractor hood can be reduced without impairing the performance of the extractor hood.

[0006] According to a first aspect, the invention therefore relates to a recirculation diverter for a range hood, wherein the recirculation diverter has an air inlet opening and at least one air outlet opening inclined towards the air inlet opening. The recirculation diverter is characterized in that a noise reduction device is arranged on at least a portion of a flow surface of the recirculation diverter that is opposite the air inlet opening.

[0007] 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°.

[0008] The extraction device can be a range hood. A range hood is a kitchen extractor hood that can be mounted above a cooktop. In a preferred embodiment, the range hood is a so-called wall-mounted hood, which is attached to a wall of the kitchen at its rear. The range hood preferably has an extraction housing, an air duct, and a chimney. The extractor housing contains the fan of the range hood, which can also be called a ventilator. The extraction housing, particularly its underside, has an extraction opening through which air can be drawn from the space above the cooktop into the extraction housing. An air duct can be connected to the extraction housing downstream of the fan in the direction of airflow. 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 angled hood. The recirculation diverter is preferably located within the chimney of the extractor hood and is directly connected to the air duct or the extractor hood housing.

[0009] Alternatively, the extractor hood can be a so-called downdraft ventilation system. In this case, the extraction opening is located in or next to a cooktop, and air is drawn downwards. With this design, the recirculation diverter can be located, for example, in the base of a kitchen cabinet. The recirculation diverter is connected to the underside of the extractor hood housing, and air enters it from above.

[0010] The recirculation diverter has an air inlet opening and at least one air outlet opening. If the recirculation diverter is part of a range hood, the air inlet opening is located on the underside of the diverter. For a downdraft ventilation system, the air inlet opening is located on the top. In the following, the term "recirculation diverter" will primarily refer to a range hood diverter. Directional terms such as "top" and "bottom" refer to a recirculation diverter that, when installed, is located above the range hood housing. For a downdraft ventilation system, the opposite applies.

[0011] The at least one air outlet opening is arranged at an angle to the air inlet opening. Preferably, the air outlet opening is offset outwards from the air inlet opening. Preferably, the at least one air outlet opening is perpendicular to the air inlet opening.

[0012] The recirculation diverter has a flow surface. The flow surface is defined as the surface opposite the air inlet opening. Thus, the flow surface is the surface over which the air exiting the air inlet opening flows. The airflow is deflected and preferably split at the flow surface. The flow surface can therefore also be referred to as the deflection surface or deflection point. According to the invention, a noise reduction device is arranged on at least a portion of the flow surface. This arrangement of the noise reduction device dampens noise generated by the fan of the extractor hood, by the air flowing through filters of the extractor hood, and by the deflection of the air in the recirculation diverter. A noise reduction device is preferably a device that absorbs noise and / or provides sound insulation.

[0013] According to a preferred embodiment, the noise reduction device has a height that is less than the height of the air outlet opening. The height of the air outlet opening is defined as the dimension of the air outlet opening extending in the direction between an upper wall of the recirculation diverter and a lower wall of the recirculation diverter. The height of the noise reduction device can also be referred to as its thickness. The thickness of the noise reduction device can, for example, be in the range of 0.5 cm to 5 cm, and preferably 1 cm. By having a height that is less than the height of the air outlet opening, the noise reduction device does not, or only minimally, impede the escape of air from the recirculation diverter, and thus does not, or only minimally, reduce the performance of the extractor hood.

[0014] According to one embodiment, the noise reduction device comprises a sound-absorbing layer. The sound-absorbing layer can, for example, be a foam layer. The sound-absorbing layer can consist, for example, of polyurethane foam, in particular a polyether-based polyurethane foam. The soft surface of a foam layer allows the sound generated by the blower, as air flows through filters of the extractor hood and / or as it is redirected in the recirculation diverter, to be at least partially absorbed. Furthermore, the sound level resulting from redirection at a soft surface is lower than the sound level at a hard, acoustically reflective surface. Thus, the airflow noise can be further reduced.

[0015] According to one embodiment, the noise reduction device comprises a perforated plate in addition to, or as an alternative to, the sound-absorbing layer. The perforated plate can be made of a sound-reflective material, such as plastic or metal. The perforated plate can also be referred to as a perforated plate or perforated sheet. By using a perforated plate, the sound incident on the noise reduction device can at least partially pass through the perforation and is thus prevented from escaping through the air outlet opening of the recirculation diverter. If the noise reduction device comprises both a sound-absorbing layer and a perforated plate, the perforated plate is preferably arranged on the side of the noise reduction device facing the air inlet opening. In the direction of airflow, the sound-absorbing layer is thus located behind the perforated plate.

[0016] This measure can also reduce tonal (subjectively disturbing) sounds. Subjective perception, so-called psychoacoustic parameters, also show a significant reduction in these tonal components and the higher frequency ranges. The customer perceives the sound as more powerful and pleasant.

[0017] The noise reduction device preferably covers an area that is at least equal to the size of the air inlet opening. More preferably, however, the noise reduction device covers an area larger than the size of the air inlet opening. According to one embodiment, the noise reduction device extends over the entire inlet area and up to the air outlet opening of the recirculation diverter. In this embodiment, the noise reduction device thus covers the entire inner surface of one side of the recirculation diverter, in particular the upper wall or the upper part of the recirculation diverter.

[0018] According to a preferred embodiment, the air diverter has a recess in the middle of the width of its upper wall, particularly its upper part, which extends from the front of the air diverter to the rear. The recess can begin at the front or at a distance from the front of the air diverter. According to a preferred embodiment, the recess extends to the rear of the air diverter.

[0019] According to one embodiment, the recess is 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 lateral air outlet openings of the recirculation diverter. The front, airflow-facing portion of the recess in the upper wall, especially the upper part of the recirculation diverter, can be conical, so that the airflow from the air inlet opening, coming from below, adheres to the conical surface and is directed to a front air outlet opening on the front of the recirculation diverter.

[0020] By providing a recess in the upper wall, particularly the upper part, of the air diverter, the air flowing from the air inlet opening is divided into at least 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.

[0021] The recess is oriented so that it lies at least partially above the air intake opening. Thus, the recess forms at least part of the flow surface and thereby causes a splitting or deflection of the air entering the recirculation diverter via the air intake opening.

[0022] According to one embodiment, the recirculation diverter comprises a base body. The base body can be made of a sound-reflective material, for example, plastic. According to one embodiment, the noise reduction device is attached to the base body, in particular to an inner surface of the base body. For example, the noise reduction device can be attached to the base body by adhesive.

[0023] The base body can be constructed in one piece or in multiple parts. According to one embodiment, the base body of the recirculation diverter comprises two parts, wherein the air inlet opening is formed in the first part and the flow area is formed by at least a portion of the second part. In the case of a recirculation diverter of a range hood, the first part is the lower part of the diverter and the second part is the upper part. Accordingly, the parts are referred to below as the lower part and upper part of the recirculation diverter.

[0024] According to one embodiment, the noise reduction device is attached to the inside of the second body part, i.e., the upper part. The inside here refers to the underside of the upper part.

[0025] Preferably, the lower part has a base, 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. Preferably, a connecting piece adjoins the base 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, particularly a plate, which preferably has the same diameter as the tube of the connecting piece. Alternatively, instead of a tube with a constant diameter, the connecting piece can have a funnel shape at the transition to the base. 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.The connecting piece of the recirculation diverter is preferably rounded in the upper area to minimize flow separation to the air outlet openings of the recirculation diverter.

[0026] The lower part, and in particular the base, preferably has a rectangular shape. The width and depth of the lower part, and in particular the base, preferably correspond to the width and depth of the extractor hood's chimney in which the recirculation diverter is located.

[0027] The air inlet opening can be located in the middle of the depth of the lower wall, in particular the lower part, especially the base. According to one embodiment, however, the air inlet opening is positioned offset forward from the middle of the lower wall, in particular the lower part, especially the base.

[0028] According to the invention, the upper wall, in particular the upper part of the recirculation diverter, is a closed component. 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. In one embodiment, the upper part consists of the base. In the simplest embodiment, the base, like the base of the lower part, is a plate. The upper part, and in particular the base, preferably has a rectangular shape. The width and depth of the upper part, and in particular the base, 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.

[0029] 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 a range hood, and particularly in the range 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 range 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.The fireplace may have openings, for example in the form of slots.

[0030] The air recirculation diverter can be open on its third and fourth sides and closed on the front and back. In an alternative embodiment, the air recirculation diverter is preferably 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 section.

[0031] According to one embodiment, 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 can be configured differently. Preferably, at least one air guide element is curved forward, at least partially. 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.

[0032] An air guide element is preferably a baffle. A baffle is defined as a wall that separates at least one section of the recirculation diverter from another section of the recirculation diverter. The baffle can therefore also be called a partition. The baffle preferably extends between the upper wall, in particular the upper part, and the lower wall, in particular the lower part, and covers the distance between the upper wall or upper part and the lower wall or lower part. According to a preferred embodiment, the baffle extends in a vertical direction.

[0033] The baffle is preferably located behind the air inlet opening. A baffle is defined as being located behind the air inlet opening if it is situated in the area between the air inlet opening and the rear, i.e., the second side, of the recirculation diverter. 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 located within this enclosed space.

[0034] 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.

[0035] 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.

[0036] In an embodiment in which the baffle is attached to the upper part or is integrally formed with it, the noise reduction device is preferably attached to the upper part in front of the baffle and extends from the baffle to the front of the recirculation diverter.

[0037] 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.

[0038] In a multi-part construction, the noise reduction device provided on the upper part can be additionally fixed by connecting the upper part to the lower part, by holding it between the upper part and the connecting bridges or connecting pins.

[0039] 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 wall or upper part and the lower wall or lower part. In particular, the air guide elements each cover the distance between the upper wall or upper part and the lower wall or lower part. According to one embodiment, the air guide elements extend in a vertical direction. 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 preferably 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. These air guide elements can also be referred to as lateral air guide elements.

[0040] 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.

[0041] According to one embodiment, two of the air guide elements are front, lateral 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, in the case of a rectangular recirculation diverter, the front, lateral air guide element 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.

[0042] 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.

[0043] 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.

[0044] The air guide elements allow the noise reduction device provided on the upper part to be additionally fixed by pressing the air guide elements against the noise reduction device from below.

[0045] 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.

[0046] According to another aspect, the invention relates to a cooker hood device comprising a recirculation diverter according to the invention.

[0047] Advantages and features described in relation to the recirculation diverter also apply – where applicable – to the extractor hood and vice versa.

[0048] The extraction device can be a range hood or a downdraft ventilation system. Preferably, the extraction device comprises an extraction housing in which the fan of the extraction device is arranged, and the recirculation diverter is connected to the extraction housing.

[0049] The invention is described again below with reference to the accompanying figures. These show: Figure 1: a schematic block representation of an embodiment of a range hood according to the invention; Figure 2: a schematic, perspective top view of a first embodiment of the recirculation diverter according to the invention; Figure 3: a schematic sectional view of the embodiment of the recirculation diverter according to Figure 2 Figure 4: a schematic sectional view of a second embodiment of the recirculation diverter according to the invention; Figure 5: a schematic perspective top view of a third embodiment of the recirculation diverter according to the invention; Figure 6: a schematic bottom view of a first embodiment of the upper part of the recirculation diverter according to the invention. Figure 5 ; and Figure 7: a schematic bottom view of a second embodiment of the upper part of the recirculation diverter according to Figure 5 .

[0050] In Figure 1Figure 1 shows an embodiment of the extractor hood 1 according to the invention. The extractor hood 1 is a range hood. It comprises an extractor housing 12, in which the fan (not shown) is housed. An air duct 100 connects to the extractor housing 12 and leads to a recirculation diverter 11. In the embodiment shown, the extractor housing 12, the air duct 100, and the recirculation diverter 11 are housed in a chimney 101. A viewing hood is arranged on the underside of the chimney 101. In the embodiment shown, the viewing hood is arranged horizontally. However, it is also within the scope of the invention for the viewing hood to be inclined upwards relative to the horizontal.

[0051] In Figure 2 and Figure 3A first embodiment of a recirculation diverter 11 according to the invention is shown. The recirculation diverter 11 has an air inlet opening 110 and two air outlet openings 111. In the embodiment shown, the air inlet opening 110 is formed in a connecting piece 1100, via which the recirculation diverter 11 can be connected, for example, to a Figure 1The air duct 100 shown can be connected. In the illustrated embodiment, the air outlet openings 111 are perpendicular to the air inlet opening 110 and are located on opposite sides of the recirculation diverter 11. The recirculation diverter 11 has a front wall and a rear wall, as well as an upper wall and a lower wall. The connecting piece 1100 is attached to the lower wall. The upper wall has a recess through which the airflow approaching the upper wall from below is split into two airflows that exit the recirculation diverter 11 via the air outlet openings 111. The recess extends over the entire depth of the recirculation diverter 11, i.e., from the front wall to the rear wall. The wall thickness of the upper wall is constant across its entire surface.The area of ​​the upper wall in which the recess is provided thus constitutes the flow surface 112, onto which the airflow entering the recirculation diverter 11 through the air inlet opening 110 impinges and is split. In the illustrated embodiment, the recirculation diverter 11, in particular its upper wall, is made of a sound-reflective material, for example, a sound-reflective plastic.

[0052] As can be seen from Figure 3 As a result, a noise reduction device 2 is arranged on the underside of the upper wall of the recirculation diverter 11 in the area of ​​the airflow surface 112. In the first embodiment, the noise reduction device 2 is formed by a sound absorption layer 20. This layer can be attached to the underside of the upper wall of the recirculation diverter 11 by means of adhesive.

[0053] In the first embodiment, the noise reduction device 2 ends at a distance from the air outlet openings 111. However, it is also within the scope of the invention that the noise reduction device 2 covers the entire underside of the upper wall.

[0054] In Figure 4 A second embodiment of a recirculating air diverter 11 is shown. This embodiment differs from the first embodiment only in the design of the noise reduction device 2. In the second embodiment, the noise reduction device 2 consists of a sound absorption layer 20 and a perforated plate 21. The perforated plate 21 is arranged on the underside of the sound absorption layer 20. This allows air and sound that impinge on the noise reduction device 2 to pass at least partially through the perforated plate 21 and impinge on the sound absorption layer 20 behind it.

[0055] In Figure 5A third embodiment of a recirculation diverter 11 is shown. This embodiment is a multi-part design. In this embodiment, the base body of the recirculation diverter 11 comprises a first body part, designated as the lower part 113, and a second body part, designated as the upper part 114. The lower part 113 has a downwardly extending connecting piece 1100 in which the air inlet opening 1100 is formed. In the embodiment shown, the recirculation diverter 11 has air outlet openings 111 on the front and sides. Air guide elements 115 are arranged between the lower part 113 and the upper part 114. In the embodiment shown, the recirculation diverter 11 has a baffle 1151 as an air guide element 115, which limits the interior of the recirculation diverter 11 to the rear. In addition, 115 air guide elements 1150 are provided as further air guide elements, which are designed as louvers.The air guide elements 1150 each extend from one side of the recirculation diverter 11 and extend to the air inlet opening 1100. Thus, in the third embodiment of the recirculation diverter shown, two air outlet openings 111 are formed on each of the opposite sides of the recirculation diverter 11, and a further air outlet opening 111 is formed on the front of the recirculation diverter 11.

[0056] In the middle of its width, the upper part 114 has a recess extending from the front of the air diverter 11 to the rear. The recess can begin at the front or at a distance from the front of the air diverter 11. In the illustrated embodiment, the recess extends to the rear of the air diverter 11. The recess has a rounded channel with a rounded front face. In particular, the front face of the recess forms part of a conical wall. The wall thickness of the upper part 114 is constant over its entire surface.

[0057] In Figure 6 is a first embodiment of an upper part 114 of a recirculation diverter 11 according to Figure 5 shown. As can be seen from Figure 6In the first embodiment of the upper part 114, the underside of the upper part 114 is partially covered by a noise reduction device 2. In this first embodiment, the noise reduction device 2 consists of a sound absorption layer 20. The sound absorption layer 20 covers the entire area of ​​the underside of the upper part 114 that lies in front of the partition 1151. Thus, the sound absorption layer 20 also covers the airflow surface 112 of the upper part 114. The sound absorption layer 20 extends to the sides and the front of the upper part 114.

[0058] The upper part 114 is attached to the lower part 113 via connecting elements. In the assembled state, the noise reduction device 2 is clamped between the upper edges of the air guide elements 115 and the underside of the upper part 114. This ensures that the noise reduction device 2 is held securely to the upper part 114 in addition to an adhesive bond. Furthermore, sound generated by vibration of the lower part 113 can be absorbed by the noise reduction device 2 and is thus not transmitted to the upper part 114 or is at least reduced.

[0059] In Figure 7 is a second embodiment of an upper part 114 of the recirculation diverter according to Figure 5The upper part 114 differs from the first embodiment of the upper part only in that the noise reduction device 2 has a perforated plate 21 in addition to the sound absorption layer 20. The perforated plate 21 is arranged on the underside of the sound absorption layer 20.

[0060] In recirculating air systems of a cooker hood, the outgoing air is typically guided through a duct and diverted to the side by a diverter. In this case, the outgoing air noise is the loudest noise source. The present invention provides a noise-reducing measure by which the noise generated by the fan, filter, and diverter is not transmitted undamped to the user of the cooker hood.

[0061] In the present invention, the recirculation diverter is preferably lined with a noise reduction device, which in particular constitutes acoustic insulation, on the surface exposed to the airflow. For this purpose, the inner surface of the flow channel in the area of ​​the deflection can be covered with a sound-absorbing layer, which can also be referred to as insulating material. Additionally or alternatively, a sound-hard deflector can be perforated, and the insulating material can be applied outside the flow channel. The sound-hard deflector can, for example, be formed by a perforated plate made of metal or plastic. With these measures, noises originating from the fan, filter, deflector, etc., are dampened at the deflection surface and prevented from being reflected further. Furthermore, less noise is generated at the surfaces during the deflection because a soft, damping material is present.

[0062] The present invention has a number of advantages. In particular, it reduces noise generated in the blower, which can also be called a fan, or during airflow through the components of the extractor hood, such as filters, intake openings, and deflectors. This reduces the airflow noise that is dominant during recirculation mode of the extractor hood.

[0063] The present invention can, in particular, reduce tonal (subjectively disturbing) sounds. Subjective perceptions (psychoacoustic parameters) also show a significant reduction of these tonal components and the higher frequency ranges. As a result, the user perceives the noises still emanating from the extractor hood and, in particular, the recirculation diverter, as more powerful and pleasant. Reference symbol list

[0064] 1 extractor hood 10 Extractor hood 100 Air duct 101 Chimney 11 Recirculation valve 110 Air inlet opening 1100 Connecting piece 111 Air outlet opening 112 Flow area 113 First part (lower part) 114 Second part (upper part) 115 Air guide element 1150 Air guide element 1151 Partition 12 extractor hood housings 2 Noise reduction device 20 Sound absorption layer 21 perforated plate

Claims

1. Recirculation diverter for a range hood (1), wherein the recirculation diverter (11) has an air inlet opening (110) and at least one air outlet opening (111) inclined towards the air inlet opening (110), characterized by the fact that A noise reduction device (2) is arranged on at least a part of an airflow surface (112) of the recirculation diverter (11) which is opposite the air inlet opening (110).

2. Recirculation diverter according to claim 1, wherein the noise reduction device (2) has a height that is less than the height of the air outlet opening (111).

3. Recirculation diverter according to claim 1 or 2, wherein the noise reduction device (2) comprises a sound absorption layer (20), in particular a foam layer.

4. Recirculation diverter according to one of claims 1 to 3, wherein the noise reduction device (2) comprises a perforated plate (21).

5. Recirculation diverter according to one of claims 1 to 4, wherein the noise reduction device (2) extends over the entire airflow surface (112) and up to the at least one air outlet opening (111) of the recirculation diverter (11).

6. Recirculation diverter according to one of claims 1 to 5, wherein the recirculation diverter (11) comprises a base body and the noise reduction device (2) is attached to the base body.

7. Recirculation diverter according to one of claims 1 to 5, wherein the recirculation diverter (11) comprises a base body and the base body of the recirculation diverter (11) comprises two body parts (113, 114), wherein the air inlet opening (110) is formed in a first of the body parts (113) and the flow surface (112) is formed by at least a partial area of ​​the second body part (114).

8. Recirculation diverter according to claim 7, wherein the noise reduction device (2) is attached to the inside of the second body part (114).

9. Recirculation diverter according to one of claims 1 to 8, wherein the recirculation diverter (11) comprises at least one air guide element (115) and the noise reduction device (2) is located between at least one air guide element (115) and an upper wall of the recirculation diverter.

10. Extractor fan, characterized by the fact that this comprises a recirculation diverter (11) according to one of claims 1 to 9.

11. Extractor hood according to claim 10, wherein the extractor hood (1) has an extractor hood housing (12) and the recirculation diverter (11) is connected to the extractor hood housing (12).

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