DE202018006721U1 - Fume hood for extracting exhaust air generated on a hob in a direction pointing vertically below a hob level - Google Patents

Abstract

Fume hood for extracting exhaust air generated on a hob (2) in a direction pointing vertically below a hob level, comprising:
an air conveying duct (10) with an inlet opening (12) which is arranged in a recess of a hob (2),
the air conveying duct (10) is arranged vertically to a plane (E _O ) defined by the inlet opening (12) and, in relation to a plane (E _L ) containing a vertical central axis (M _L ) of the air conveying duct (10), two conveying duct halves (14 ; 16), each communicating in a lower region (18; 20) with a suction chamber (22; 24) communicating with a fan chamber (26; 28), characterized in that
that in each conveying duct half (14; 16) and mirror-symmetrically to the plane (E _L ) of the air conveying duct (10) there is a first air guiding device (30; 32), a second air guiding device (34; 36) and a third air guiding device (38; 40) are arranged, as well as a fine separation device (42; 42'), wherein the first air guiding device (30; 32) is spaced apart from the plane (E _L ) and is arranged adjacent to the inlet opening (12) and is set up to direct an exhaust air flow entering through the inlet opening into to direct towards the second air guide means (34; 36);
the second air guiding device (34; 36) is spaced apart from the first air guiding device (30; 32) and is arranged along a section of the plane (E _L ) and is set up to separate fat particles from the exhaust air flow and direct the exhaust air flow in the direction of the third air guiding device (38 ;40) to steer, and
the third air guiding device (38; 40) is arranged at a distance from the second air guiding device (34; 36) and at a distance from the plane (E _L ) and is set up to separate fat particles from the exhaust air flow and
directing the flow of exhaust air in the direction of the fine separation device (42; 44), the fine separation device (42) of the first conveyor channel half (14) and the fine separation device (42') of the second conveyor channel half (16) each being formed by a separator plate, each of which is in a acute angle to the plane (E _L ) of the air conveying duct (10) is arranged in such a way that they form a one-piece V-shaped Feinabscheidekanal, which is between the two second opposite side wall surfaces (48, 50) of the air conveying duct (10) and is detachably connected to these side wall surfaces.

Description

The present invention relates to an extractor hood for extracting exhaust air generated on a hob in a direction pointing vertically below a hob plane, having the features of the preamble of claims 1, 5 and 15.

the EP 3 133 350 A1 discloses a filter unit for a fume extraction device, which comprises at least one filter element, with an air inlet opening being formed on the top of the filter unit, which is used for the intake of air that is sucked in by the fume extraction device, with an air outlet opening being provided in the underside of the filter unit , which is used for the outlet of air from the filter unit to the fume extraction device, and wherein in the filter unit at least two filter elements are used, which are arranged one above the other, at least a part of the upper filter element is designed as a collecting element for collecting liquid and at least below the upper filter element at least one collection area is provided for collecting liquids.

Vapor extractors, with which exhaust air generated on a hob is drawn off in a direction pointing vertically below the plane of the hob, are known in the prior art. Like extractor hoods, i.e. extractors that are attached to a room wall or ceiling, extractors of the generic type serve to discharge the exhaust air produced on a hob when cooking and frying food. The exhaust air to be discharged and thus sucked in by the extractor naturally contains fat particles. In order to prevent, as far as possible, the fat particles entrained in the exhaust air from getting into the blower device of the extractor, grease filters are usually provided for cleaning the exhaust air before it enters the blower device.

In order to increase the efficiency of the grease filter, it is also known to provide two opposing fan devices, each with a radial fan, downstream of the grease filter.

That's how she describes it EP 2 975 327 A1 an assembly unit with a hob and a device for operating the hob, in which two opposing radial fans are provided downstream of a hollow-cylindrical grease filter.

Even if the efficiency of the grease filter can be increased in this way, it is still not possible to prevent grease particles from being carried along to a not entirely inconsiderable extent in the exhaust air entering the blower devices. Unwanted fat particles can thus be deposited in the blower devices, accompanied by an unpleasant odor.

The object of the present invention is to further improve an extractor according to the preamble of claims 1, 5 and 15 and to increase the degree of separation of the fat particles carried along by the exhaust air flow.

According to the invention, the object is achieved by a fume hood with the features of claim 1, 5 or 15.

The fact that first, second and third air guiding devices are provided in each half of the conveying duct of the air conveying duct of the extractor means that the exhaust air flow is deflected twice in succession in each half of the conveying duct in the area of the second and third air guiding devices and, as a result, there is turbulence in the exhaust air flow in these areas. As a result of the turbulence, small fat particles carried along in the exhaust air stream conglomerate. Due to their mass, the conglomerated fat particles can no longer follow the streamlines of the deflected exhaust air flow, but instead adhere to the second or third air guiding device, i.e. they are separated from the exhaust air flow there.

The degree of separation of the fat particles contained in the exhaust air flow is thus significantly increased, because the fine separation device downstream of the third air guiding device is supplied with an exhaust air flow that has been pre-cleaned to a large extent.

Preferred embodiments as well as details and advantages of the present invention result from the dependent claims.

The air conveying duct of the extractor is preferably box-shaped and has two first opposite side wall surfaces, two second opposite side wall surfaces and a bottom wall surface opposite the inlet opening. Preferably, the two first opposite side wall surfaces each form an upper area and a lower area, by means of which each conveying channel half communicates with the respectively associated exhaust air intake chamber. The cross section of the air conveying duct is preferably rectangular or square.

According to a first preferred embodiment of the air conveying duct of the extractor according to the invention, the first and third air guiding devices of each half of the conveying duct are preferably each integral with the upper area one of the two first opposite side wall panels. In this way, the first air guiding device in each case forms an upper end of the upper region of one of the two first opposite side wall surfaces, which protrudes like a nose into the conveying channel half and thus provides a first air guiding device in each case, and the third air guiding device in this way in each case forms a lower end of that upper one Area that protrudes like a shell in the conveyor channel half and so each provides a third air flow device.

Instead of being nose-like, the respective upper end of the upper area of the two first opposite side wall surfaces can also be designed in another suitable shape, which is suitable - such as a convex curvature - to direct the inflowing exhaust air stream in the direction of the respective second air guiding device. The term shell-like is to be understood to mean that the lower end of the upper region of the first two opposite side wall surfaces protruding into one half of the conveying channel has a sufficiently inwardly curved surface that allows the adhering fat particles to be held. For effective deflection of the exhaust air flow in the direction of the fine separation device, it is advantageous if the free end of the third air guiding device designed in this way extends approximately to a plane containing the central axis of the conveying channel half (referred to below as plane E _L ).

The two second air guiding devices, which are mirror-symmetrical to plane E _L of the air conveying duct, are preferably provided by a module that can be inserted into the air conveying duct and can be detachably fastened to the two second, opposite side wall surfaces of the air conveying duct. This has the advantage that the second air guiding devices can be cleaned in a simple manner, because for this purpose the module only has to be detached from the side wall surfaces and removed from the air conveying duct. There is also the additional advantage that the module, which can be easily removed from the air conveying duct, also makes the two third air guiding devices easily accessible for cleaning purposes.

The module is preferably armature-shaped and has a slender armature neck that is mirror-symmetrical to the plane E _L of the air conveying duct and two anchor arms that are mirror-symmetrical to the plane E _L of the air conveying duct, each of which protrudes like a shell into one half of the conveying duct and thus each provides a second air guiding device.

The slender armature neck, which is mirror-symmetrical to the plane E _L of the air conveying duct, advantageously supports the guidance of the exhaust air flow directed from the respective first air guiding device to the respective second air guiding device. The term shell-like is also to be understood here to mean that the anchor arms each have a sufficiently inwardly curved surface that allows the adhering fat particles to be held. Furthermore, the deflection of the exhaust air flow in the direction of the respective third air guiding device is effectively supported if the free end of each anchor arm extends approximately to a plane containing a vertical central axis of the respective half of the conveying channel (hereinafter referred to as plane E _H ).

The module preferably has an anchor body which is mirror-symmetrical to the plane E _L and carries the two anchor arms. Advantageously, the anchor body is hollow and is formed by two anchor body surfaces which meet in the plane E _L and are each arranged at an acute angle to this plane. The design of the anchor body as a hollow body is advantageous in that the dead weight of the module is reduced, which in turn is advantageous when the module is removed from the air conveying duct. The acute-angled arrangement of the anchor body surfaces is advantageous in that they advantageously support the guidance of the exhaust air flow deflected from the respective second air guiding device to the respective third air guiding device. The respective acute angle is preferably in a range between 30° and 55°.

According to a second preferred embodiment of the air conveying channel of the extractor according to the invention, the first, second and third air conveying devices arranged in each conveying channel half and mirror-symmetrical to the plane E _L are each provided by a pair of first, second and third air guiding devices. The air ducting devices of each pair of first, second and third air ducting devices are mirror-symmetrical in relation to the aforementioned plane E _H of each delivery duct half, such that a first air ducting device is spaced apart from the plane E _H of the respective delivery duct half and is arranged adjacent to the inlet opening and is set up to direct the incoming flow of exhaust air in the direction of a second air guiding device in each case, the respective second air guiding device being spaced apart from the respective first air guiding device and being arranged along a section of the plane E _H of the conveying channel half and being set up to separate fat particles from the exhaust air flow and convert the exhaust air flow into Direction of a respective third Luftführungseinrich direction, and the respective third air guiding device is arranged at a distance from the respective second air guiding device and from the plane E _H of the conveyor channel half and is set up to separate fat particles from the exhaust air flow and direct them in the direction of the fine separation device arranged in the respective conveyor channel half.

The air conveying channel of the extractor according to the invention designed in this way is particularly advantageous for large-area hobs with a corresponding number of cooking zones. Because of the pairs of first, second and third air guiding devices provided in each of the two conveying channel halves of the air guiding channel, a double successive deflection of the exhaust air flow in the area of the respective second and third air guiding devices can be forced in each half of a conveying channel half and, due to the associated turbulence of the Exhaust air flow, a separation of conglomerated fat particles on the respective second and third air duct device. The fine separating device arranged in each half of the conveying duct and designed mirror-symmetrically to the plane E _L of the air conveying duct can thus be supplied by every third air guiding device with a highly pre-cleaned exhaust air stream.

Of the pairs of first, second and third air guiding devices provided in each conveying duct half of the air conveying duct, each pair of first air guiding devices and each pair of third air guiding devices has a first air guiding device and a first third air guiding device, which are preferably integral with the upper area of one of the two first opposite side wall surfaces of the air conveying duct are formed.

The first first air guiding device in each case provides an upper end of the upper region of the respective side wall surface of the two first opposite side wall surfaces, which protrudes like a nose into the conveying channel half. Instead of being nose-like, the respective upper end of the upper area can also be designed in the form of a convex curvature. The first third air guiding device in each case provides a lower end of the upper region of the respective side wall surface of the two first opposite side wall surfaces, which protrudes like a shell into the respective half of the conveying channel. The term shell-like is also to be understood here to mean that the respective lower end of the upper area has a sufficiently inwardly curved surface that allows the adhering fat particles to be held. Furthermore, i.e. for the effective deflection of the exhaust air flow, it is advantageous if the free end of the respective lower end of that upper region designed in this way extends approximately into half of the space of the respective conveying channel half, which is defined by the respective side wall surface of the two first side wall surfaces of the air conveying channel and through the plane E _H of the respective half of the conveying channel.

Each pair of the first air guiding devices and each pair of the third air guiding devices also has a second first air guiding device and a second third air guiding device, which are preferably provided by a first module that can be inserted into the air conveying duct and can be detachably fastened to the two second opposite side wall surfaces of the air conveying duct . This has the advantage that the air-guiding devices provided by the first module--for example for cleaning purposes--can be easily removed from the air conveying duct. This module is preferably anchor-shaped and has, in relation to the plane E _L of the air conveying duct, a mirror-symmetrical anchor head, a mirror-symmetrical, slim anchor neck and two mirror-symmetrical anchor arms, each of which protrudes like a shell in the direction of the plane E _H of the respective half of the conveying channel.

The anchor head preferably has a rhombic cross section, so that its head halves each protrude like a nose into the respective half of the respective delivery channel half. The mirror-symmetrical head halves of the anchor head can also be designed in an alternative form that is suitable—such as a convexly curved head half—to direct the inflowing exhaust air stream in the direction of the respective second air guiding device.

The slender armature neck, which is mirror-symmetrical to the plane E _L of the air conveying duct, advantageously supports the guidance of the exhaust air flow directed in each case in the direction of a second, third air guidance device.

The term shell-like is also to be understood here to mean that the anchor arms each have a sufficiently inwardly curved surface that allows the adhering fat particles to be held.

Each pair of the second air guiding devices is preferably provided by a second module that can be inserted into the respective half of the conveying channel and can be detachably fastened to the two second, opposite side wall surfaces of the air conveying channel. This has the advantage that the air ducting devices provided by the second module in each case - for example to Reini supply purposes - can be easily removed from the air conveying duct halves.

Preferably, the second module in each case is anchor-shaped and has, in relation to the plane E _H of each delivery channel half, a slim anchor neck that is mirror-symmetrical to the plane E _H and, in relation to this plane, two mirror-symmetrical anchor arms, each of which extends like a bowl from the plane E _H point away from the respective half of the conveyor channel. The slender anchor neck, which is mirror-symmetrical to the plane E _H of the respective half of the delivery channel, is advantageous in that it supports the guidance of the exhaust air flow in each half of the delivery channel that is directed from the first or second first air guiding device in the direction of the respective second air guiding device.

The term shell-like is also to be understood here to mean that the anchor arms each have a sufficiently inwardly curved surface that allows the adhering fat particles to be held. Furthermore, i.e. for the effective deflection of the exhaust air flow in the direction of the respective third fine separation device, it is advantageous if the free ends of the anchor arms each extend approximately into half of the space of the respective conveyor channel half, which is defined by the respective side wall surface of the first two opposite ones Side wall surfaces of the air conveying channel and the respective plane E _H of the respective conveying channel half or through the plane E _H of the air conveying channel and the plane E _H of the respective conveying channel half.

Both the first module and the two second modules preferably each have an anchor body which is mirror-symmetrical to the respective plane E _L or E _H and which carries the respective anchor arms. The anchor body is preferably hollow in each case and is formed by two anchor body surfaces that come together in the respective plane E _H and are each arranged at an acute angle to the respective plane. The design of the anchor body as a hollow body is advantageous in that the dead weight of the modules is reduced, which in turn is advantageous when the modules are removed from the air conveying duct--for example for cleaning them. The respective acute-angled arrangement of the anchor body surfaces is advantageous in that the anchor surfaces of the respective second module advantageously support the guidance of the exhaust air flow directed from the respective second air guiding device in the direction of the respective third air guiding device. The respective acute angle is preferably in a range between 30° and 55°.

In order to remove even the last fat particles carried along from the pre-cleaned exhaust air flow before it enters the exhaust air intake chambers, a fine separation device designed mirror-symmetrically to the plane E _L is provided in each conveying channel half.

According to the invention, the fine separating device is provided by a specially designed separating plate, which is arranged at an acute angle to the plane E _L . The separating plates thus together form a one-piece V-shaped fine separating duct which extends between the two second opposite side wall surfaces of the air conveying duct and is detachably connected to these side wall surfaces. The separating devices provided in this way can thus be easily removed from the air conveying duct for cleaning purposes. In relation to the lower areas of the first two opposite side wall surfaces, by means of which each conveyor channel half communicates with the associated exhaust air intake chamber, the surface of the two separating plates and their respective arrangement angle to the plane E _L is advantageously selected such that the flow in the direction of the respective exhaust air intake chamber Exhaust air flow is completely covered by the surface of the respective separator plate.

Each separating plate preferably has a fine separating front pointing in the direction of the plane E _L of the air conveying duct and a grid-like carrier structure carrying the fine separating front.

The fine separation front is preferably formed from a large number of identical and evenly spaced cuboids, each of which has a square front face pointing in the direction of the plane E _L . The front surface preferably has a size of 10×10 mm. Each parallelepiped also has a bottom surface parallel to the plane of its front surface and a guide surface integral with a portion of the bottom surface and projecting beyond the bottom surface. Due to the fine separation front formed in this way, ie due to the labyrinthine air ducts created in this way, a multiple deflection of the exhaust air flow is forced and, associated with this, corresponding turbulence. As a result, the last fat particles carried along by the pre-cleaned exhaust air flow conglomerate and adhere to the guide surfaces and slide off them due to the angular arrangement of the two separator plates in the direction of the bottom surface of the air conveying duct, where they can collect in a fat particle collecting tray arranged there.

The carrier structure carrying the fine separation front preferably has a lattice structure which does not represent any noticeable flow resistance for the exhaust air stream flowing in the direction of the respective exhaust air intake chamber.

The fine separation front and the support structure are preferably made of a material that has good resistance to fat and oil. Preferably the material is polyamide.

According to the invention, each separating device in each half of the conveying channel is provided by preferably three identically designed and equally spaced separating plates, which extend in the respective half of the conveying channel between the two second opposite side wall surfaces of the air conveying channel and are each detachably connected to these side wall surfaces.

The at least three separating plates in each case preferably have a kink in each case along their central longitudinal axis, such that they each point away from the plane E _L of the air conveying duct in a convex manner at a flat angle. Such an arrangement or configuration advantageously supports the guidance of the exhaust air flow directed from the respective first third or second third air guiding device to the separating plates.

Of the at least three separating plates in each case, one separating plate that is positioned in front of the lower region of the respective first side wall surface is preferably arranged with its upper end adjacent to a free end of a respective first third air guiding device and thus advantageously supports the guiding of the air guided by one of the respective third air guiding devices in the direction of the Separation device deflected exhaust air flow. Accordingly, a separating plate arranged opposite plane E _L of the air conveying duct is preferably arranged with its upper end adjacent to a free end of a respective second third air guiding device and thus advantageously supports the guiding of the exhaust air flow deflected by the respective second third air guiding device in the direction of the fine separation device.

Preferably, the separating plates are each designed as a perforated plate. Only a small part of the exhaust air flow is pushed through the openings of the perforated plates, but this is sufficient to prevent the build-up of a laminar flow on the respective rear side of the perforated plate facing the exhaust air intake chamber and instead to force further turbulence in the exhaust air flow and thus a conglomeration of small, in grease particles still entrained in the exhaust air flow.

Advantageously, the area ratio of each perforated plate from open to closed areas is greater than 50%. In this way, sufficient areas are available for the separation of grease particles still contained in the exhaust air. If the aforementioned area ratio remains below 55%, the perforated plates still have a stability that is sufficient for the mere attachment of the perforated plates to the two second opposite side wall surfaces of the air conveying duct.

Preferably, the holes in the perforated plates each have a diameter of between 1 and 5 mm. In this way it can be achieved that the holes have a size at which, on the one hand, relatively high capillary forces develop and, on the other hand, the holes are prevented from becoming clogged relatively quickly. Particularly preferably, the holes in the perforated plates each have a diameter of 3 mm.

The perforated plates are preferably made from a material that has good resistance to grease and oil. A preferred material is stainless steel.

Naturally, pots and roasters with different wall heights are used on a hob. However, in order to supply the correspondingly generated exhaust air as completely as possible to the air conveying duct, a louvred grille which can be inserted into the inlet opening of the air conveying duct is preferably provided, which has a large number of evenly spaced lamellas which, in relation to the plane E _L , are mirror-symmetrical and each have the same inclination point away from the plane E _L. This inclination is defined by an angle which is defined by a tangential plane of the outer surface of that blade which is arranged adjacent to the plane E _L of the air conveying duct and by the plane E _L of the air conveying duct, the tangential plane containing a line in which the through intersect the plane defined by the inlet port and the plane E _L . The aforesaid angle is preferably in a range from 20° to 30°.

In order to enable easy access to the interior of the air duct and effortless cleaning of the louvred grille, the louvred grille is detachably connected to the two second opposite side wall surfaces of the air duct.

In order to optimally adapt the extraction of the exhaust air generated on a hob to the conditions prevailing on a hob - for example to the operation of only individual hotplates or the operation of all hotplates - a slidable closing device which can be inserted into the inlet opening of the air conveying duct is provided according to the invention, by means of which either one conveying channel half of the air conveying channel can be fully released or one half of each conveying channel half. In this way, it is also advantageously achieved that the exhaust air volume sucked into the air conveying duct is always the same, regardless of the respective position of the closing device.

The closing device is advantageously arranged directly above the lamellar grid. In terms of a sliding carriage, the closing device is advantageously carried by the free edge surfaces of the two second opposite side wall surfaces of the air conveying duct. Alternatively, the closing device can also be slidably arranged on the upper side of the lamellar grid.

A radial fan is arranged in each of the two blower chambers of the extractor according to the invention. Advantageously, the blower chamber communicating with an exhaust air intake chamber is arranged in such a way that the exhaust air flow is sucked in vertically downwards. In this way, there is also a deflection and associated turbulence of the exhaust air flow in the area of the respective fine separation device, which has a favorable effect on the separation of the last fat particles contained in the pre-cleaned exhaust air flow.

A removable fat particle collecting tray arranged on the bottom wall surface of the air conveying duct is provided for collecting the fat particles separated by the separating device.

After removing the anchor-shaped module provided according to the first preferred embodiment of the air duct according to the invention or the first and the two second anchor-shaped modules provided according to the second preferred embodiment of the air duct according to the invention, the fat particle collecting tray can be easily removed from the air duct for cleaning purposes.

Further details and advantages of the invention result from the description of exemplary embodiments, which are explained in more detail below with reference to the attached figures. The figures are for illustration purposes and are not drawn to scale.

• 1 eine schematische Schnittansicht des erfindungsgemäßen Dunstabzugs gemäß einer ersten bevorzugten Ausführungsform,
• 2 eine schematische Schnittansicht des erfindungsgemäßen Dunstabzugs gemäß einer zweiten bevorzugten Ausführungsform,
• 3 den Luftförderkanal des erfindungsgemäßen Dunstabzugs gemäß der ersten bevorzugten Ausführungsform, und zwar mit einer in dem Luftförderkanal angeordneten Feinabscheideeinrichtung sowie einem in der Einlassöffnung des Luftförderkanals angeordneten Lamellengitter und einer darauf gleitbar angeordneten Verschließeinrichtung,
• 4a und 4b den Luftförderkanal des erfindungsgemäßen Dunstabzugs gemäß der zweiten bevorzugten Ausführungsform, und zwar mit einer in dem Luftförderkanal angeordneten Feinabscheideeinrichtung gemäß zwei alternativen Ausführungsformen sowie einem in der Einlassöffnung des Luftförderkanals angeordneten Lamellengitter und einer darauf gleitbar angeordneten Verschließeinrichtung,
• 5 eine schematische Schnittdarstellung des Lamellengitters,
• 6a und 6b den Strömungsverlauf der Abluft in dem Luftförderkanal des erfindungsgemäßen Dunstabzugs gemäß der ersten bevorzugten Ausführungsform,
• 7a und 7b den Strömungsverlauf der Abluft in dem Luftförderkanal des erfindungsgemäßen Dunstabzugs gemäß der zweiten bevorzugten Ausführungsform,
• 8 eine dreidimensionale Darstellung des modularen Luftförderkanals des erfindungsgemäßen Dunstabzugs gemäß der ersten bevorzugten Ausführungsform,
• 9 eine dreidimensionale Darstellung des modularen Luftförderkanals des erfindungsgemäßen Dunstabzugs gemäß der zweiten bevorzugten Ausführungsform, und
• 10 den Strömungsverlauf des aus der jeweiligen Förderkanalhälfte austretenden und in die jeweilige Abluftansaugkammer und Gebläsekammer eintretenden Abluftstroms.

In the figures show:

• 1 a schematic sectional view of the extractor according to the invention according to a first preferred embodiment,
• 2 a schematic sectional view of the extractor according to the invention according to a second preferred embodiment,
• 3 the air conveying duct of the extractor hood according to the invention according to the first preferred embodiment, namely with a fine separation device arranged in the air conveying duct and a lamellar grid arranged in the inlet opening of the air conveying duct and a closing device arranged slidably thereon,
• 4a and 4b the air conveying duct of the extractor hood according to the invention according to the second preferred embodiment, namely with a fine separation device arranged in the air conveying duct according to two alternative embodiments as well as a lamellar grid arranged in the inlet opening of the air conveying duct and a closing device arranged slidably thereon,
• 5 a schematic sectional view of the louvred grille,
• 6a and 6b the flow of the exhaust air in the air conveying duct of the extractor according to the invention according to the first preferred embodiment,
• 7a and 7b the flow pattern of the exhaust air in the air conveying duct of the extractor according to the invention according to the second preferred embodiment,
• 8th a three-dimensional representation of the modular air conveying duct of the extractor according to the invention according to the first preferred embodiment,
• 9 a three-dimensional representation of the modular air conveying duct of the extractor according to the invention according to the second preferred embodiment, and
• 10 the course of the flow of the exhaust air flow exiting from the respective half of the conveyor channel and entering the respective exhaust air intake chamber and blower chamber.

1 shows a first preferred embodiment of the extractor according to the invention. The inlet opening 12 of the air conveying duct 10 is arranged in a central recess of a hob 2 and in the inlet opening 12 itself a lamellar grille 82 and a slidable closing device 86 are arranged in a particularly preferred manner, which will be discussed in more detail below.

The air conveying duct 10 is arranged vertically in relation to a plane E _O defined by the inlet opening 12 and, in relation to a plane, has the vertical co The plane E _L of the air conveying duct containing the axis M _L has two conveying duct halves 14 , 16 which each communicate in a lower region 18 , 20 with an exhaust air intake chamber 22 which communicates with a blower chamber 26 .

8th , in which the aforementioned planes E _O and E _L are also shown, shows the modularly designed air conveying duct 10 using a three-dimensional representation. As can be seen, the air handling duct 10 is box-shaped and includes two first opposed side wall panels 44, 46, two second opposed side wall panels 48, 50 (side wall panel 48 is not shown for purposes of illustration), and a bottom wall panel 52. The two first opposite side wall surfaces 44, 46 each define an upper region 19, 21 and a lower region 18, 20. Each delivery channel half 14, 16 communicates with the respective exhaust air intake chamber 22, 24 by means of such a respective lower region of each first side wall surface 44, 46.

How to summarize the 1 , 3 and 8th further removed, each conveying channel half 14, 16 has a first air guiding device 30, 32, a second air guiding device 34, 36 and a third air guiding device 38, 40 mirror-symmetrically to the plane E _L of the air conveying channel 10, as well as a fine separation device 42, 42'. The first air guiding device 30, 32 and the third air guiding device 38, 40 are advantageously each formed integrally with the upper region 19, 21 of the respective side wall surface of the two first opposite side wall surfaces 44, 46. The first air guiding device 30, 32 in each case forms an upper end of that upper area 19, 21, which protrudes like a nose into the respective conveying channel half 14, 16 and thus provides a first air guiding device in each case. The third air guiding device 38, 40 in each case forms a lower end of that upper region 19, 21, which protrudes like a shell into the respective conveying channel half 14, 16 and thus provides a third air guiding device in each case.

From the synopsis of 1 and 8th It can also be seen that the second air guiding device 34, 36 is in the form of an anchor in each case by means of a module 54 which is inserted into the air conveying duct 10 and is detachably connected to the two second opposite side wall surfaces 48, 50 and has an anchor neck 56 which is mirror-symmetrical to the plane E _L of the air conveying duct 10 and, in relation to the plane E _L , two mirror-symmetrical anchor arms 58, 58', each of which protrudes like a shell into one half of the conveying channel and thus each provides a third air guiding device.

The anchor arms 58 , 58 ′ are carried by an anchor body 60 which is mirror-symmetrical to the plane E _L of the air conveying duct 10 . The armature body 60 is provided by two armature body surfaces which meet in the plane E _L of the air conveying duct and are each arranged at an acute angle to the plane E _L . In this way, the anchor body is advantageously designed as a weight-saving hollow body. The aforementioned acute angle is in a range between 30° and 55°. The armature body surfaces arranged in this way advantageously support the guidance of the exhaust air flow deflected by the respective second air guiding device in the direction of the respective third air guiding device.

on the in 1 or. 8th The fine separation device shown will be discussed later.

2 shows a second preferred embodiment of the extractor according to the invention. The inlet opening 12 of the air conveying duct 10 is again arranged in a central recess of a hob 2, and in the inlet opening 12 itself a lamellar grille 82 and a slidable closing device 88 are arranged in a particularly preferred manner, which will be discussed in more detail later.

The air conveying duct 10 is _arranged vertically to a plane EO defined by the inlet opening and, in relation to the plane E _L of the air conveying duct 10, has two conveying duct halves 14, 16, each of which is connected in a lower region 18, 20 to a fan chamber 26 , 28 communicating exhaust air intake chamber 22, 24 communicate.

9 , in which the aforementioned planes E _O and E _L are also shown, shows the modularly designed air conveying duct 10 using a three-dimensional representation. As shown, the air handling duct 10 is box-shaped and includes two first opposed side wall panels 44, 46, two second opposed side wall panels 48, 50 (side wall panel 48 is not shown for purposes of illustration), and a bottom wall panel 52.

How to summarize the 2 , 4 and 9 removes, each conveying duct half has mirror symmetry to the plane E _L of the air conveying duct 10 in each case a pair of first air guiding devices 30, 32; 30', 32', a pair of second air guide devices 34, 36; 34', 36' and a pair of third air guiding devices 38, 40; 38', 40' on. Furthermore, a fine separation device 42, 42' is provided in each conveying channel half 14, 16, which is mirror-symmetrical to the plane E _L is technically trained. It can also be seen that the air ducting devices of the first 30, 32; 30', 32', second 34, 36; 34', 36' and third pair 38, 40; 38′, 40′ of the air-guiding devices are each formed mirror-symmetrically in relation to a plane E _H containing the vertical central axis of one half of the conveying channel.

Furthermore, one removes the 2 , 4 and 10 that each pair of the first air guiding devices 30, 32; 30', 32' and each pair of third air guiding devices 38, 40; 38', 40' each have a first first air guiding device 30, 30' and each a first third air guiding device 38, 38', which are each formed integrally with the upper region 19, 20 of one of the two first opposite side wall surfaces 44, 46 of the air conveying duct 10 . In this case, the first first air guiding device 30, 30' in each case provides an upper end of that upper area 19, 21 which protrudes like a nose into the respective conveying channel half 14, 16 and thus provides a first first air guiding device in each case; and the first third air guiding device 38, 38' in each case forms a lower end of that upper region 19, 21, which protrudes like a shell into the respective conveying channel half 14, 16 and thus provides a first third air guiding device in each case.

It can also be seen that each pair of first air ducting devices 30, 32, 30', 32' and each pair of third air ducting devices 38, 40, 38', 40' also each have a second first air ducting device 32, 32' and a second third air ducting device 40, 40', which are provided by a first module 62 that can be inserted into the air conveying duct 10 and releasably fastened to the two second opposite side wall surfaces 48, 50 of the air conveying duct 10. The module 62 is anchor-shaped and has an anchor head 64 with a rhombic cross-section, the head halves of which are mirror-symmetrical to the plane E _L of the air conveying duct 10 and each protrude like a nose into a conveying duct half 14, 16, thus providing a second first air guiding device in each case. The anchor-shaped module 62 also has a slender anchor neck 66 that carries the anchor head 64 and is mirror-symmetrical to the plane E _L , and two mirror-symmetrical anchor arms 68, 68' with respect to the plane E _L , each of which is shell-like in one of the two delivery channel halves 14, 16 protrude and thus each provide a second third air guiding device.

Finally, it can also be seen that each pair of the second air guiding devices 34, 36, 34', 36' are each replaced by a second module 70, 70' is provided. The module 70, 70' is in the form of an anchor and has a slender anchor neck 72, 72' which is mirror-symmetrical to the plane E _H of the conveying channel half 14, 16 and, in relation to the plane E _H , two mirror-symmetrical anchor arms 74, 76, 74', 76', each pointing away from the plane E _H in a shell-like manner and thus providing a pair of the second second air guiding devices.

The aforementioned first module 62 and the respective second module 70, 70' each have an anchor body 69, 78, 78' carrying the anchor arms 68, 68', 74, 76, 74', 76', which, in relation to the respective plane E _L , E _H , is formed with mirror symmetry.

The anchor body 69, 78, 78' is provided by two anchor body surfaces which unite in the respective plane E _L , E _H and which are each arranged at an acute angle to the respective plane E _L , E _H . In this way, the anchor body is advantageously designed as a weight-saving hollow body. The aforementioned acute angle is in a range between 33° and 55°. The armature body surfaces arranged in this way advantageously support the guidance of the exhaust air flow deflected by the respective second air guiding device in the direction of the respective third air guiding device.

According to both the first preferred embodiment and the second preferred embodiment of the air conveying duct 10 of the extractor according to the invention, a fine separation device 42, 42' is provided in each conveying duct half 14, 16, which is used in each case to remove the last fat particles from the pre-cleaned exhaust air flow before it enters the respective exhaust air intake chamber. According to the invention, the fine separating devices provided in the two halves of the conveying channel are mirror-symmetrical in relation to the plane E _L of the air conveying channel 10 . the 3 or. 4a and 4b show two preferred embodiments of such mirror-symmetrical fine separation devices.

According to a first preferred embodiment, the 3 and 4a a fine separation device formed by two separation plates. The two separating plates are each arranged at an acute angle to the plane E _L of the air conveying duct and together form a one-piece V-shaped fine separating duct which extends between the two second opposite side wall surfaces 48, 50 and is detachably connected to them. As illustrated is relative to each lower region 18, 20 of the first two opposite side wall surfaces 44, 46, by means of which each conveying duct half 14, 16 communicates with the associated exhaust air intake chamber, the surface of the two separating plates and their respective arrangement angles to the plane E _L of the air conveying duct 10 are selected such that the in Direction of the respective Abluftansaugkammer flowing exhaust air stream is completely covered by the surface of the respective separating plate.

The separating plates are preferably designed in such a way that each separating plate has a fine separation front 100 pointing in the direction of the plane E _L of the air conveying duct 10 and a grid-like carrier structure carrying the fine separation front.

As in particular from the 8th As can be seen, the fine separation front 100 is formed from a multiplicity of equally spaced parallelepipeds 102, each of which has a square front face pointing in the direction of the plane E _L . Furthermore, each parallelepiped has a bottom surface which is parallel to the plane of its front surface and a guide surface which is integrally formed therewith and projects beyond the bottom surface. The fine separation front 100 of each separation plate formed in this way, ie the labyrinth-like air ducts created in this way, forces the exhaust air flow to be deflected multiple times and associated with this, corresponding turbulence. As a result, the last fat particles carried along by the exhaust air flow conglomerate and adhere to the air guide surfaces and slide from them due to the angular arrangement of the two separator plates in the direction of the bottom wall surface 52 of the air conveying duct 10 and can collect in a fat particle collecting tray arranged there.

The carrier structure carrying the fine separation front 100 has a lattice structure (not shown) which does not represent any noticeable flow resistance for the exhaust air stream flowing in the direction of the respective exhaust air intake chamber.

According to a second preferred embodiment, the 4b and 9 a fine separating device 42, 42', which, in relation to the plane E _L of the air conveying duct, is provided by three identically designed and evenly spaced separating plates 41, 41', 41'', 43, 43', 43'', which in the respective conveying channel half 14, 16 in each case between the two second opposite side wall surfaces 48, 50 and are detachably connected thereto.

As can be seen, the three separating plates 41, 41', 41'', 43, 43', 43'' also each have a kink 88, 88', 88'', 90, 90', 90'' along their central longitudinal axis , so that they each point flat-angled convexly away from the plane E _L of the air conveying duct 10 . Such an arrangement or design advantageously supports the guidance of the exhaust air flow directed from the respective first, third or second, third air guiding device to the separating plates 41, 41', 41'', 43, 43', 43''.

As well as in particular from the 9 can be seen, of the three separating plates in each case, a separating plate 41, 43 is positioned in front of the lower region 18, 20 of the respective first opposite side wall surfaces 44, 46 with its upper end 92, 92' adjoining a free end of a respective first third air duct device 38, 38 'Arranged and thus supports in an advantageous manner the guidance of the deflected by the third air duct device in each case in the direction of the Feinabscheideeinrichtung exhaust air flow. Correspondingly, an upper end 94, 94' of a separating plate 41'', 43'' located in front of the plane E _L of the air conveying duct borders on a free end of a respective second third air ducting device 40, 40' in order to guide the air flow from the respective third air ducting device in To further support the direction of the separating device deflected exhaust air flow in an advantageous manner.

The separating plates 41, 41', 41'', 43, 43', 43'' are preferably each designed as perforated plates. Only a small part of the exhaust air flow is pressed through the openings of the perforated plates, which is nevertheless sufficient to prevent the build-up of a laminar flow on the respective perforated plate rear side facing the exhaust air intake chamber and instead to force further turbulence in the exhaust air flow and thus a conglomeration of small, in grease particles still entrained in the exhaust air flow.

Advantageously, the area ratio (not shown) of the respective perforated plates of open to closed areas is greater than 50%. In this way, sufficient areas are available for the separation of grease particles still contained in the exhaust air. Even with an area ratio of less than 55%, the perforated plates still have a stability that is sufficient for merely fastening them to the second opposite side wall surfaces 48, 50 of the air conveying duct 10.

The holes (not shown) in the perforated plates preferably each have a diameter of between 1 and 5 mm. The holes are of a size that, on the one hand, develops relatively high capillary forces and, on the other hand, prevents that the holes fill up relatively quickly. Particularly preferably, the holes in the perforated plates each have a diameter of 3 mm.

As in particular from the 1 until 5 It can also be seen that a lamellar grille 82 that can be inserted into the inlet opening 12 of the air conveying duct 10 is provided, which has a large number of lamellas 84 that are evenly spaced from one another and are mirror-symmetrical to the plane E _L of the air conveying duct 10 and each have the same inclination from the plane F point _L away. How through 5 As illustrated, the inclination of the louvers 84 is determined by an angle of inclination α, which in turn is defined by a tangential plane E _T of the outer surface of the louver 84, which is arranged adjacent to the plane E _L of the air handling duct 10, and by the plane E _L of the air handling duct 10, where the tangent plane _ET includes a line where the planes _EO and _ET intersect. The angle α is preferably in a range between 20° and 30°. The lamellar grille designed in this way takes account of the fact that pots and roasters that have different wall heights are naturally used on a hob. Nevertheless, the correspondingly generated exhaust air should be supplied to the extractor hood as completely as possible. This is advantageously achieved by the lamellae 84 of the aforementioned lamellar grille 82 which can be inserted into the inlet opening 12 of the air conveying duct 10 and which are arranged at a particular angle of inclination. In order to be able to easily clean the louvred grille and also to allow easy access to the interior of the air duct 10 , the louvred grille is detachably connected to the two second opposite side wall surfaces of the air duct 10 .

the 1 until 4b also show a slidable closing device 86 arranged in the inlet opening 12 of the air conveying duct 10. The slidable closing device 86 is then arranged directly above the lamellar grid 82, which insofar carries the closing device in the sense of a slidable carriage. Alternatively, the closing device 86 can also be slid from the respective upper free edges 96, 98 (due to the illustration in 8th or. 9 only edge 96 to be seen) of the two second opposite side wall surfaces 48, 50 of the air conveying duct 10 are supported. The closing device 86 can be moved in such a way that it opens the inlet opening 12 either for one of the two delivery channel halves 14, 16 or only one half of the two delivery channel halves 14, 16. In this way, the extractor according to the invention can be optimally adapted to the conditions prevailing on a hob be adjusted, ie depending on whether the hob is operated with only individual hotplates or even all hotplates. In addition, the slidable closing device 86 advantageously ensures that the exhaust air volume sucked into the air conveying duct 10 always remains the same.

the 6a , 6b and 7a , 7b each illustrate the inventively enforced deflection of the exhaust air, which takes place twice in succession, in the area of the second and third air ducting devices, the 6a and 6b show the air conveying duct 10 according to the first preferred embodiment of the extractor according to the invention and the 7a and 7b the air conveying duct 10 according to the second preferred embodiment of the extractor according to the invention.

6a shows the slidable closing device 86 in one of the three possible positions, namely in which the inlet opening 12 is opened to one half of the two conveying channel halves 14, 16. As illustrated by the course of the arrows symbolizing the flow of exhaust air, the second 34, 36 and third air guiding devices 38, 40 each force a two-fold successive deflection of the exhaust air flow, resulting in a corresponding turbulence of the exhaust air flow in these areas. As explained at the outset, the turbulence in the exhaust air flow leads to a conglomeration of small fat particles carried along in the exhaust air flow. Due to their mass, the conglomerated fat particles can no longer follow the streamlines of the deflected exhaust air flow, but rather adhere to the second 34, 36 and third air guiding devices 38, 40. The fine separating devices 42, 42' arranged downstream of the third fine separating devices 34, 36 are thus supplied with a highly pre-cleaned exhaust air stream.

6b shows the closing device 86 in one of the other two positions, namely in a position in which the inlet opening 12 is released to one half of the conveying channel. As illustrated by the course of the arrows symbolizing the flow of exhaust air, the second 34, 36 and third air guiding devices 38, 40 each force a two-fold successive deflection of the exhaust air flow, resulting in a corresponding turbulence of the exhaust air flow in these areas.

7a shows the slidable closing device 86 in the position in which the inlet opening 12 of the air conveying duct 10 is opened to one half of the two conveying duct halves 14, 16 in each case.

As illustrated by the arrows symbolizing the course of the exhaust air flow, occurs in each conveying channel half 14, 16, a prominently forced deflection of the exhaust air flow occurring twice in succession in the area of the second air ducting device 34 or 34' and in the area of the third air ducting device 38 or 38'. Furthermore, although not quite as significantly, a forced deflection that occurs twice in succession also takes place in the area of the second air guiding device 36 or 36' and in the area of the third air guiding device 40 or 40'. Due to the turbulence of the exhaust air flow associated with the deflection, small fat particles entrained in the exhaust air flow conglomerate and, for the reasons explained above, the conglomerated fat particles are separated at the aforementioned air guiding devices.

7b 8 shows the slidable closing device 86 in a position in which the inlet opening 12 is exposed to one of the two conveying channel halves 14, 16.

As illustrated by the course of the arrows symbolizing the flow of exhaust air, there is a prominent, forced deflection of the exhaust air that occurs twice in succession in the area of the second air ducting device 34 and in the area of the third air ducting device 38. Furthermore, although not quite as prominently, there is a forced deflection that occurs twice in succession deflection that takes place in the region of the second air ducting device 36 and the third air ducting device 40. However, in the conveying channel half 16 covered by the closing device 86, a forced deflection of the exhaust air flow occurs twice in succession, specifically in the region of the second air ducting devices 34', 36' and in the Area of the third air guiding device 40'. Furthermore, there is a pronounced deflection of the exhaust air flow in the area of the third air guiding devices 38', 40'.

As stated at the outset, each delivery channel half 14, 16 communicates via the respective lower region 18, 20 of the respective side wall surface of the two opposite second side wall surfaces 44, 46 with the respective associated exhaust air intake chamber 22, 24, which communicates with the respective blower chamber 26, 28, in the a radial fan is arranged in each case. How from the 1 and 2 As can be seen, the blower chamber 26, 28 is arranged in each case in such a way that the exhaust air flow is sucked in vertically downwards. this is in 10 illustrated by the arrows symbolizing the course of the exhaust air flow. In synopsis with the 1 and 2 one takes the 10 furthermore that the exhaust air flow in the respective lower area 18, 20 and thus also in an area of the separating device 42, 42' upstream of the respective lower area 18, 20 is deflected again. The associated turbulence of the exhaust air flow has an advantageous effect on the separation of the last fat particles that are still carried along by the pre-cleaned exhaust air flow. This advantageous deflection of the exhaust air flow is achieved by the arrangement of the fan housing 26, 28, ie by the suction of the exhaust air flow forced thereby in a vertically downward direction.

Reference List

2

hob

10

air conveying channel

12

intake port

14; 16

conveyor channel halves

18; 20

lower area of the conveyor channel halves

19; 21

upper area of the conveyor channel halves

22; 24

exhaust air intake chamber

26; 28

blower chamber

ML

Central axis of the air conveying duct

30; 32

first airflow device

34; 36

second airflow device

38; 40

third airflow device

42; 42'

fine separation device

MH

Central axis of a conveyor channel half

30, 32; 30', 32'

Pair of first air duct devices

34, 36; 34', 36'

Pair of second air duct devices

38, 40; 38', 40'

Pair of third air duct devices

30; 30'

first first air duct devices

38;38'

first third air duct devices

32; 32'

second first air guiding devices

40; 40'

second third air guiding devices

44, 46

first side wall surfaces of the air conveying duct

48, 50

second side wall surfaces of the air conveying duct

52

Bottom wall surface of the air duct

54

module

56

anchor neck

58; 58

anchor arms

60

anchor body

62

first module

64

anchor head

66

anchor neck

68; 68'

anchor arms

69

anchor body

70; 70'

second module

72; 72'

anchor neck

74, 76; 74', 76'

anchor arms

78; 78'

anchor body

41, 41', 41''; 43, 43', 43''

separator plates

82

louvered grille

84

slats

ET

tangent plane

a

angle

EO

plane defined by the inlet port

ML

Central axis of the air conveying duct

MH

Central axis of an air conveying duct half

el

Level of the air conveying duct, which includes the central axis M _L

eh

Level of an air duct half, which includes the central axis M _H

86

sealing device

88, 88', 88''; 90, 90', 90''

kink

92; 92'

upper end of separator plate 41 or 43

94; 94'

upper end of separator plate 41" or 43"

96; 98

upper free edges of the two second opposite side wall surfaces of the air conveying duct

100

fine separation front

102

cuboid

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 3133350 A1 [0002]
• EP 2975327 A1 [0005]

Claims (29)

Fume hood for extracting exhaust air generated on a hob (2) in a direction pointing vertically below a hob level, comprising: an air conveying duct (10) with an inlet opening (12) which is arranged in a recess of a hob (2), the air conveying duct (10 ) is arranged vertically to a plane (E _O ) defined by the inlet opening (12) and, based on a plane (E _L ) containing a vertical central axis (M _L ) of the air conveying duct (10), has two conveying duct halves (14; 16). , each communicating in a lower region (18; 20) with a suction chamber (22; 24) communicating with a fan chamber (26; 28), characterized in that in each delivery channel half (14; 16) and mirror-symmetrically to the plane (E _L ) of the air conveying duct (10), a first air guiding device (30; 32), a second air guiding device (34; 36) and a third air guiding device (38; 40) are arranged, as well as a fine separation device ( 42; 42'), wherein the first air guiding device (30; 32) is spaced apart from the plane (E _L ) and arranged adjacent to the inlet opening (12) and is set up to direct an exhaust air flow entering through the inlet opening in the direction of the second air guiding device (34; 36) to steer; the second air guiding device (34; 36) is spaced apart from the first air guiding device (30; 32) and is arranged along a section of the plane (E _L ) and is set up to separate fat particles from the exhaust air flow and direct the exhaust air flow in the direction of the third air guiding device (38 ; 40), and the third air guiding device (38; 40) is arranged at a distance from the second air guiding device (34; 36) and at a distance from the plane (E _L ) and is set up to separate fat particles from the exhaust air flow and to convert the exhaust air flow into in the direction of the fine separation device (42; 44), the fine separation device (42) of the first conveyor channel half (14) and the fine separation device (42') of the second conveyor channel half (16) each being formed by a separator plate, each of which is at an acute angle to the plane (E _L ) of the air conveying duct (10) is arranged in such a way that it forms a one-piece V-shaped fine Form bscheidekanal which extends between the two second opposite side wall surfaces (48, 50) of the air conveying duct (10) and is detachably connected to these side wall surfaces. fume hood after claim 1 , each separating plate having a fine separation front (100) pointing in the direction of the plane (E _L ) of the air conveying duct (10) and a grid-like carrier structure carrying the fine separation front (100). fume hood after claim 2 , wherein the fine separation front (100) is formed from a plurality of identical and equally spaced cuboids (102), each of which has a square front face pointing in the direction of the plane (E _L ), and each cuboid (102) has a face facing the plane of its front surface has a parallel bottom surface and a guide surface integral with a portion of the bottom surface and which projects beyond the bottom surface. fume hood after claim 2 or 3 , wherein the fine separation front (100) and its support structure are made of polyamide. Fume hood for extracting exhaust air generated on a hob (2) in a direction pointing vertically below a hob level, comprising: an air conveying duct (10) with an inlet opening (12) which is arranged in a recess of a hob (2), the air conveying duct (10 ) is arranged vertically to a plane (E _O ) defined by the inlet opening (12) and, based on a plane (E _L ) containing a vertical central axis (M _L ) of the air conveying duct (10), has two conveying duct halves (14; 16). , each communicating in a lower region (18; 20) with a suction chamber (22; 24) communicating with a fan chamber (26; 28), characterized in that in each delivery channel half (14; 16) and mirror-symmetrically to the plane (E _L ) of the air conveying duct (10), a first air guiding device (30; 32), a second air guiding device (34; 36) and a third air guiding device (38; 40) are arranged, as well as a fine separation device ( 42; 42'), wherein the first air guiding device (30; 32) is spaced apart from the plane (E _L ) and arranged adjacent to the inlet opening (12) and is set up to direct an exhaust air flow entering through the inlet opening in the direction of the second air guiding device (34; 36) to steer; the second air guiding device (34; 36) is spaced apart from the first air guiding device (30; 32) and is arranged along a section of the plane (E _L ) and is set up to separate fat particles from the exhaust air flow and direct the exhaust air flow in the direction of the third air guiding device (38 ; 40), and the third air guiding device (38; 40) is arranged at a distance from the second air guiding device (34; 36) and at a distance from the plane (E _L ) and is set up to separate fat particles from the exhaust air flow and to convert the exhaust air flow into To direct the direction of the fine separation device (42; 44), the För in each first (30; 32), second (34; 36) and third air guiding device (38; 40) arranged mirror-symmetrically to the plane (E _L ) of the air conveying duct (10) in each case by a pair of first air guiding devices ( 30, 32; 30', 32'), a pair of second air guiding devices (34, 36; 34', 36') and a pair of third air guiding devices (38, 40; 38', 40'), the air guiding devices of the first , second and third pairs of air guiding devices are each designed mirror-symmetrical with respect to a plane (E _H ) containing a vertical central axis (M _H ) of the conveying channel half (14; 16), such that a first air guiding device (30, 32; 30' , 32') spaced from the plane (E _H ) of the respective conveying channel half (14; 16) and adjacent to the inlet opening (12) and is set up to direct an exhaust air flow entering through the inlet opening in the direction of a second air duct device (34, 36; 34', 36'); the respective second air guiding device (34, 36; 34', 36') is spaced from the first air guiding device (30, 32; 30', 32') and is arranged and arranged along a portion of the plane ( _EH ) fat particles separated from the flow of exhaust air and directing the flow of exhaust air in the direction of a respective third air guiding device (38, 40; 38', 40'), and the respective third air guiding device (38, 40; 38', 40') from the respective second air guiding device (34 , 36; 34', 36') and is arranged at a distance from the plane (E _H ) and is set up to separate fat particles from the exhaust air flow and to direct the exhaust air flow in the direction of the fine separation device (42; 44), the fine separation device (42) of the first conveying channel half (14) and the fine separation device (42') of the second conveying channel half (16) each have at least three identical and evenly spaced separator plates (41, 41', 41"; 43, 43', 43"), which sic h in the respective conveying channel half (14; 16) between the two second opposite side wall surfaces (48; 50) of the air conveying duct (10) and are detachably connected to these side wall surfaces (48; 50). fume hood after claim 5 , wherein each pair of the first air guiding devices (30, 32; 30', 32') and each pair of the third air guiding devices (38, 40; 38', 40') each have a first first air guiding device (30; 30') and each a first third air guiding device (38; 38'), each of which is formed integrally with the upper region (19; 21) of one of the two first opposite side wall surfaces (44; 46) of the air conveying duct (10), the first first air guiding device (30; 30') in each case provides an upper end of the upper region (19; 21), which protrudes like a nose into the conveying channel half (14; 16) and thus provides a first first air guiding device (30; 30') in each case, and the respective first third air guiding device ( 38; 38') in each case forms a lower end of the upper region (19; 21), which projects into the conveying channel half (14; 16) like a shell and thus provides a first, third air guiding device (38; 38'), with each pair of the first en air guiding devices (30, 32; 30', 32') and each pair of third air-guiding devices (38, 40; 38', 40') also each have a second first air-guiding device (32; 32') and each a second third air-guiding device (40; 40'), which provided by a first module (62) which can be inserted into the air conveying duct (10) and can be detachably fastened to the two second opposite side wall surfaces (48; 50) of the air conveying duct (10), the module (62) being designed in the shape of an anchor and having an anchor head (64 ) with a rhombic cross-section, the head halves of which are mirror-symmetrical in relation to the plane (E _L ) of the air conveying duct (10) and each protrude like a nose into one conveying duct half (14; 16) and thus each have a second first air guiding device (32; 32') provide, an anchor neck (66) carrying the anchor head (64) and mirror-symmetrical to the plane (E _L ) and, in relation to the plane (E _L ), two mirror-symmetrical anchor arms (68; 68'), each shell-like in a conveying channel half (14; 16) and thus provide a second, third air guiding device (40; 40'), and wherein each pair of second air guiding devices (34, 36; 34', 36') each have a a second module (70; 70') that can be releasably fastened to the two second opposite side wall surfaces (48; 50) of the air conveying duct (10) is provided, wherein the module (70; 70') is in each case designed in the shape of an anchor and has a plane (E _H ) of the delivery channel half (14; 16) has a mirror-symmetrical anchor neck (72; 72') and, in relation to the plane (E _H ) of the delivery channel half (14; 16), has two mirror-symmetrical anchor arms (74, 76; 74', 76'). , each pointing away from the plane (E _H ) like a shell and thus providing a pair of the second air guiding devices (34, 36; 34', 36'). fume hood after claim 6 , wherein the first module (62) and the respective second module (70; 70') each have an anchor body (69; 78, 78') carrying the anchor arms (68, 68'; 74, 76; 74', 76'). , which is mirror-symmetrical in relation to the respective plane (E _L ; E _H ). fume hood after claim 7 , wherein the anchor body (69; 78, 78') is formed in each case by two anchor body surfaces uniting in the respective plane (E _L ; E _H ) and the anchor body surfaces Chen are each arranged at an acute angle to the respective plane (E _L ; E _H ). Fume hood after one of Claims 5 until 8th , wherein the at least three separating plates (41, 41', 41''; 43, 43', 43'') each have a kink (88, 88', 88''; 90, 90', 90'') along their central longitudinal axis. have such that they each have a flat angle convex from the plane (E _L ) of the air conveying duct (10) away. Fume hood after one of Claims 5 until 9 , wherein of each of the at least three separating plates (41, 41', 41''; 43, 43', 43'') one separating plate (41; 43) each, which is in each case the lower region (18; 20) of the respective first side wall surface (44; 46) is arranged in front of it, with its upper end (92; 92') adjacent to a free end of the respective first third air guiding device (38; 38'), and a separating plate (41'';43'') , which is arranged opposite the plane (E _L ) of the air conveying duct (10), with its upper end (94; 94') adjacent to a free end of the respective second third air guiding device (40; 40'). Fume hood after one of Claims 5 until 10 , wherein the separating plates (41, 41', 41"; 43, 43', 43") are each designed as a perforated plate. fume hood after claim 11 , where the ratio of open to closed areas of each perforated plate is greater than 50%. fume hood after claim 11 or 12 , the diameter of the holes in each perforated plate being between 1 and 5 mm. Fume hood after one of Claims 11 until 13 , whereby the perforated plates are each made of stainless steel. Fume hood for extracting exhaust air generated on a hob (2) in a direction pointing vertically below a hob level, comprising: an air conveying duct (10) with an inlet opening (12) which is arranged in a recess of a hob (2), the air conveying duct (10 ) is arranged vertically to a plane (Eo) defined by the inlet opening (12) and, based on a plane (E _L ) containing a vertical central axis (M _L ) of the air conveying duct (10), has two conveying duct halves (14; 16), each communicating in a lower region (18; 20) with a suction chamber (22; 24) communicating with a blower chamber (26; 28), characterized in that in each delivery channel half (14; 16) and mirror-symmetrically to the plane ( _EL ) of the air conveying duct (10), a first air guiding device (30; 32), a second air guiding device (34; 36) and a third air guiding device (38; 40) are arranged, as well as a fine separation device (42 ; 42'), wherein the first air guiding device (30; 32) is spaced apart from the plane (E _L ) and arranged adjacent to the inlet opening (12) and is set up to direct an exhaust air flow entering through the inlet opening in the direction of the second air guiding device (34; 36) to steer; the second air guiding device (34; 36) is spaced apart from the first air guiding device (30; 32) and is arranged along a section of the plane (E _L ) and is set up to separate fat particles from the exhaust air flow and direct the exhaust air flow in the direction of the third air guiding device (38 ; 40), and the third air guiding device (38; 40) is arranged at a distance from the second air guiding device (34; 36) and at a distance from the plane (E _L ) and is set up to separate fat particles from the exhaust air flow and to convert the exhaust air flow into direction of the fine separation device (42; 44), the fume hood further comprising a slidable closure device (86) arranged in the inlet opening (12) of the air conveying duct (10). fume hood after claim 15 , wherein the closing device (86) either completely releases one of the two delivery channel halves (14; 16) or only one half of the two delivery channel halves (14; 16). fume hood after claim 15 or 16 , wherein the closing device (86) is arranged above the lamellar grid (82) and slides on it. fume hood after claim 15 or 16 wherein the two second opposed side wall panels (48, 50) of the air handling duct (10) slidably support the closure means (86) on their respective upper free edges (96, 98). Extractor according to one of the preceding claims, wherein the air conveying duct (10) is box-shaped and has two first opposite side wall surfaces (44; 46), two second opposite side wall surfaces (48; 50) and a base wall surface (52), the two first opposite side wall surfaces (44; 46) of the air conveying duct (10) each define an upper region (19; 21) of the side wall surfaces and a lower region (18; 20) thereof, by means of which each conveying duct half (14; 16) is connected to the respective exhaust air intake chamber (22; 24) communicated. fume hood after claim 19 , wherein the first air guiding device (30; 32) and the third air guiding device (38; 40) are each formed integrally with the upper region (19; 21) of one of the two first opposite side wall surfaces (44; 46), the first air guiding device (30 ; 32) in each case forms an upper end of the upper area (19; 21), which protrudes like a nose into the conveying channel half (14; 16) and thus provides a first air guiding device (30; 32) in each case, and the third air guiding device (38; 40 ) in each case forms a lower end of the upper region (19; 21), which in each case projects like a shell into the conveying channel half (14; 16) and thus provides a third air guiding device (38; 40) in each case, and wherein the second air guiding device (34; 36) is provided in each case by a module (54) which can be inserted into the air conveying duct (10) and can be detachably fastened to the two second opposite side wall surfaces (48; 50) of the air conveying duct (10), wherein the module (54) is in the form of an anchor and has an anchor neck (56) which is mirror-symmetrical to the plane (E _L ) of the air conveying duct (10) and, in relation to the plane (E _L ), two anchor arms (58) which are mirror-symmetrical; 58'), each of which protrudes like a shell into a conveying channel half (14; 16) and thus each provides a second air guiding device (34; 36). fume hood after claim 20 , wherein the module (54) has an anchor body (60) which carries the anchor arms (58, 58') and which, in relation to the plane (E _L ) of the air conveying duct (10), is of mirror-symmetrical design. fume hood after Claim 21 , wherein the anchor body (60) is hollow and is formed by two anchor body surfaces meeting in the plane (E _L ), and the body surfaces are each arranged at an acute angle to the plane (E _L ), the angle being in a range of 30° to 55°. Fume extractor according to one of the preceding claims, which further comprises a lamellar grille (82) which can be inserted into the inlet opening (12) of the air conveying duct (10). fume hood after Claim 23 , wherein the lamellar grille (82) has a large number of lamellae (84) which are spaced evenly apart from one another and which, in relation to the plane (E _L ) of the air conveying duct (10), are of mirror-symmetrical design and each have the same inclination from the plane (E _L ) of the air conveying duct (10), the inclination being defined by an angle (α), the angle (α) being defined by a tangential plane (E _T ) of the outer surface of that louver (84) which is adjacent to the plane (E _L ) of the air conveying duct (10) and through the plane (E _L ) of the air conveying duct (10), the tangential plane (E _T ) containing a line in which the planes (E _O ) and (E _L ) intersect, and wherein the angle (a) is in a range between 20° and 30°. fume hood after Claim 23 or 24 , wherein the lamellar grille (84) is detachably fastened to the two second opposite side wall surfaces (48, 50) of the air conveying duct (10). Extractor according to one of the preceding claims, wherein a radial fan is arranged in each case in the blower chamber (26; 28) and the blower chamber (26; 28) is arranged in each case in such a way that the exhaust air flow is sucked in vertically downwards. Extractor according to one of the preceding claims, wherein a fat particle collecting tray is arranged on the bottom wall surface (52) of the air conveying duct (10). Hob (2) with a fume hood according to one of Claims 1 until 27 . Hob (2) after claim 28 , wherein a closing device (86) is aligned with a plane defined by the hob (2).

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