EP2159493A2 - Fumes extracting device - Google Patents

Abstract

The vapor extraction device (1) comprises an aerator (40) and a filter element surrounding partly the aerator. The filter element has a grease filter and the filter element downstreams the aerator. The filter element has an odor filter (30), which has a discharge opening of the vapor extraction device or upstreams a discharge opening of the vapor extraction device. The discharge opening surrounds the odor filter.

Description

The present invention relates to a fume extraction device comprising a fan and a fan element at least partially surrounding the fan.

When cleaning room air, especially in the cleaning of fumes and fumes that occur at a hotplate, it is known to use extractor device, in particular cooker hoods. These known extractor devices are usually operated in the exhaust air mode. Here, the sucked through the extractor and purified air to the environment, for example, by means of a wall box through a house wall, passed. Furthermore, extractor devices, in particular extractor hoods are known, which can be brought in addition to the exhaust air operation in a so-called recirculation mode. In this mode of operation of the extractor device sucked by the extractor and purified air is discharged back into the room from which it was sucked, for example, a kitchen. The requirements for a fume extractor to be operated in the recirculation mode, in particular with respect to the purity of the air leaving this fume extractor, increased.

In the GB 2 274 705 A An extractor hood is described in which a fan is provided in the extractor device. Air is transported via the fan to the fan via an intake area, from where it is discharged radially and directed to a filter element which radially surrounds the fan. This filter element is designed as a grease filter. After cleaning through the filter, the cleaned air is discharged via outlet openings on the upper front of the extractor into the room from which the air was sucked.

A disadvantage of this type of extractor hood is that the fan is contaminated by the air entering the fume extractor. On the other hand, it is disadvantageous that the grease filter is aligned vertically and so the fat deposited therein runs down in this and must be collected. For this purpose, a catch basin is provided in the extractor device of the prior art.

Object of the present invention is therefore to provide a fume extraction device that suck in a simple way fumes and vapor from a cooking or other workplace, clean and can give back in good quality in the room in which the extractor device is operated.

The invention is based on the finding that this task can be solved by suitable design and arrangement of filter elements and / or the fan.

The object is therefore achieved by a fume extraction device having a fan and at least one fan surrounding the fan at least partially. The extractor device is characterized in that a filter element connected upstream of the fan is a grease filter and at least one filter element at least partially surrounding the fan is connected downstream of the fan and constitutes an odor filter.

For the purposes of this invention, the extractor device is, in particular, an extractor hood which is used for extracting and cleaning fumes and vapors via a hotplate or another workstation. As a fan, which is also referred to below as a fan, a fan is referred to in the context of the invention, in which the sucked air enters axially through a suction, is deflected radially in the fan of the fan and leaves the fan substantially perpendicular to the suction. Upstream of the fan is understood in the context of this invention, a filter element that is arranged in front of the suction side, in particular the intake manifold, the fan and preferably completely covers the inlet opening to the fan, in particular the Einsaugstutzens. Downstream of the fan is understood in the context of the present invention, a filter element which lies in the flow direction of the air sucked by the fan after the fan.

The filter elements, namely the grease filter and the odor filter can be formed according to the present invention of one or more filter units. The filter units can be in the odor filter, for example, filter cartridges filled with activated carbon pellets, or filter mats made of activated carbon. In the case of the grease filter, filter cartridges, for example made of expanded metal layers, or nonwoven mats can also be used as filter units.

The odor filter according to the present invention is a filter element which at least partially surrounds the fan. For the purposes of the present invention, surrounding the fan is understood as meaning an arrangement of the odor filter which at least partially covers the blow-out opening of the fan. The blow-out opening of the fan is formed by the blades arranged over the circumference of the fan wheel or by the clearance existing between the blades. Particularly preferably, the odor filter element completely surrounds the circumference of the fan wheel. The filter element may in this case be arranged at a distance from the blow-out opening of the fan.

In the present invention, by providing a grease filter upstream of the fan and an odor filter downstream of the fan, which preferably completely surrounds the fan, the quality of the air discharged through the extractor is high, and the load on the components of the extractor is in particular of the fan due to contamination, minimized by the grease filter. In addition, can be realized by the arrangement of the odor filter around the fan around a relatively small height of the extractor device, whereby the visual appearance of the extractor device is improved.

In contrast, extractor devices in which odor filter are installed in front of the fan and immediately after the grease filter, significant advantages are achieved in the construction of the extractor device according to the invention. Thus, in the extractor device according to the invention, the collapse of the values of the delivery volume is not to be feared. At the same time, the noise levels achieved with the extractor device are relatively low.

According to a preferred embodiment, the odor filter represents the outlet opening of the extractor device or is connected upstream of an outlet opening surrounding the odor filter of the extractor device. For the purposes of the present invention, the outlet opening of the extractor device is understood to mean the opening of the extractor device, via which the air purified by the extractor device is returned to the room in which the extractor device is operated. The outlet opening may also be through an air-permeable or air-vented area For example, a panel of the extractor device are formed, so do not have to represent a continuous opening.

The arrangement of the odor filter on or in front of the outlet opening of the extractor device, a maximum filter surface for cleaning the already pre-cleaned by the grease filter air can be achieved. In the case in which the odor filter surrounding the fan is connected upstream of the outlet opening, the outlet opening of the extractor device also preferably completely surrounds the fan, in particular the fan wheel. Thus, also in this embodiment, a maximum filter surface of the odor filter is provided, whereby the air quality of the extractor device leaving the air is increased. In addition, in both embodiments, the flow resistance to which the air discharged from the fan is exposed is minimized. This is advantageous over extractor devices in which the air flow emitted by the fan is directed into a fume hood housing and from there can escape from the housing only through a small area in which the outlet opening is provided.

According to a preferred embodiment, the odor filter is arranged in the discharge direction of the fan. The blow-out direction of the fan is preferably perpendicular to the suction direction of the fan. By arranging the odor filter in the discharge direction of the fan, the supply of air sucked by the fan to the odor filter and thus the cleaning of this air is ensured. This targeted supply of air to the odor filter is compared to arrangements in which the air to be cleaned only flows past the odor filter advantageous. In particular, in an odor filter completely surrounding the fan of the fan in the arrangement of the odor filter in the discharge direction of the fan, the flow area of the filter is very large. The supply line to the odor filter is also certainly possible in the extractor device according to the invention, since the fan power, which is necessary for the transport of air through the odor filter can be provided without problems even after a long time, since contamination of the fan by grease due to the upstream Grease filter is prevented. By the odor filter is located after the fan and is blown directly by the fan, with this embodiment of the extractor device good readings in the odor reduction degree measurement can be obtained. In addition, this is Arrangement also the result of displacement measurements significantly better than in extractor devices according to the prior art.

The odor filter can have a barrel or ring shape. According to one embodiment, however, the odor filter is constructed in the form of an octagon. Here, preferably individual filter units, such as filter cartridges are aligned so that they together form the shape of an octagon. The advantage of this embodiment lies in particular in the simple production of the odor filter, which can be composed of individual filter units. Alternatively, the shape of the odor filter, for example the shape of an octagon, can also be formed by a frame and filter material, for example in the form of cassettes or mats, can be held in the frame. In this embodiment, the filter material is preferably applied to the frame from the inside. As a result, the frame, the filter material against the air flow, which prevails from the inside of the odor filter, be supported. This can prevent that the odor filter material is pressed outwards and the odor filter is damaged if necessary.

According to a preferred embodiment, the odor filter has a thickness in the range of 15mm to 25mm, preferably 20mm. In the arrangement of the odor filter according to the invention, such a thickness of the odor filter can be realized without having to accept any losses with regard to the air quality output by the extractor device or having to make increased demands on the delivery rate of the fan. This is because the area over which the odor filter is flowed is maximized. Despite the relatively large thickness of the odor filter, therefore, a backflow of the air to be passed through the filter is not to be feared.

According to one embodiment, the grease filter, which is connected upstream of the fan, has at least two mutually angled filter surfaces. By this configuration, fumes and vapor can be effectively detected by the extractor device, which does not flow in the vertical direction of the inlet opening of the fan. In addition, compared to a flat grease filter, the effective filter area can be increased in this embodiment and so the cleaning of the vapors and fumes are further improved.

Particularly preferably, the fat filter comprises a horizontal and an angled up to the horizontal region range. The upwardly angled region is preferably oriented perpendicular to the horizontal region. As a result, the grease filter has a box shape in which at the bottom of the box and the side surfaces are filter surfaces. According to the invention, it is possible to provide at least the side surfaces of the grease filter in this embodiment with a veneer, are provided in the passage openings. This veneer can be designed so that its undersides together form a frame in which the edges of the filter material of the grease filter are held in the horizontal area. The openings provided in the veneer can be, for example, vertical longitudinal slots. The use of a veneer has the advantage that the visual appearance of the extractor device is improved. The side surfaces of a box-shaped grease filter, which is connected upstream of the fan and is arranged in particular below the fan, are visible to the user of the extractor device. The veneering prevents direct inspection of the filter material of the grease filter in the vertical region and thus improves the visual impression of the extractor device.

Although the embodiment of the invention is described essentially with reference to a box-shaped grease filter having a horizontal and vertical regions, it is also possible according to the invention to provide the regions of the grease filter in a different arrangement to each other. Thus, for example, a region corresponding to an inverted pyramid may be provided in the grease filter and / or the lateral regions may be inclined upwardly at an angle of less than 90 ° from the horizontal. Furthermore, it is also possible to provide a grease filter with only a horizontal area or with only vertical side surfaces.

In the case of the grease filter, the next filter surface located in the axial direction is preferably 20 mm away from the inlet nozzle. This is the horizontal region of the grease filter in the latter embodiment. The vertical or at another angle upwardly angled portion of the grease filter is preferably mounted at least at a distance from the radius of the inlet nozzle of the fan.

According to one embodiment, the extractor device may have a lid on which odor filters are provided at least in some areas. By providing a cover, on the one hand, a mounting possibility for the fan is created, which lies outside the direction of flow of the fan by vapors and steam. On the other hand can be ensured by providing a cover that all air is passed through the odor filter surrounding the fan and in particular no contaminated air can escape upwards. Thus, the targeted air flow from the exhaust openings of the fan to the surrounding odor filter, preferably annular odor filter, supported and guaranteed. By additionally providing odor filters on the lid, the values of the odor reduction measurement are almost optimal.

The fan is preferably designed as a radial fan.

According to a preferred embodiment, the fan of the extractor device is a fan with backward curved blades, in particular in radial fans with backward curved blades. There are two types of radial fans. On the one hand blowers with forward curved blades are known, which are also referred to as drum runners. On the other hand, high-performance fans with backward-curved blades are known. In both variants, the air is sucked axially through a suction port, deflected radially in the fan of the fan and leaves the fan substantially perpendicular to the suction. As backward curved blades blades are understood in this context, the curvature of which runs counter to the direction of rotation of the axis of the fan. By using a radial fan with backward curved blades, the widest range can be covered in view of different requirements for the radial fan. In particular, with such a radial fan, it is possible to achieve particularly good values, both with regard to the delivery volume and with regard to the pressure difference between the intake port and the outlet port. Furthermore, high-performance fans, that is radial fans with backward-curved blades, are operated at higher speeds, and the efficiency achievable with these radial fans is better in comparison with drum fans. This higher efficiency is advantageously used in the extractor device according to the invention, since the pressure difference is determined by the odor filter arranged around the fan is increased. When using a radial fan with backward curved blades, this pressure difference is not a problem.

Another advantage associated with using a radial fan with backward curved blades for the present invention is that the fan with backward curved blades can also be operated without providing a special fan housing, such as a volute casing.

According to one embodiment, the fan according to the present invention is therefore provided without fan housing in the extractor device. As a result, the freedom of design with respect to the dimensions of the extractor device is not additionally limited. Furthermore, when using a fan with backward-curved blades, even without a fan housing, it is possible to build up a sufficient pressure through which vapors and vapor can be drawn. In the case of a fan with forwardly curved blades, the construction of pressure is not possible in the case of use without a fan housing, so that therefore only little or no air can be conveyed through the extractor device. As a fan housing is understood in the context of this invention, a housing that surrounds the fan immediately. Between the outer sides of the blades or the impeller and the inside of the fan housing in this case a minimum distance is provided. Other components, such as filters or the like are not provided in a fan housing between the fan and the inside of the housing. Furthermore, a closed space is formed by a fan housing according to the invention, which has only one inlet opening and a limited to a small peripheral region of the fan impeller air outlet.

Particularly preferably, the fan of the extractor device is a single-flow fan, especially in single-flow radial fan. As a single-flow fan is referred to in the context of the invention, a fan in which the air is sucked through an opening in the fan. Compared to double-flow fans, the air circulation that can be achieved with a single-flow fan is greater. In addition, a main flow direction is predetermined by the arrangement of a fume extraction device above a cooking position. In a single-flow fan, the air inlet, in particular the air inlet pipe, can be aligned with this main flow direction so that the air inlet is perpendicular to the main flow direction. In a double-flow fan, however, would be to allow the suction on both air inlets the orientation of the Air inlets parallel to the main flow direction and would therefore require increased fan power to allow suction of the vapors and fumes in the air inlets can.

According to one embodiment, the extractor device has an inner frame for holding the fan. The inner frame is preferably arranged between the fan and the odor filter. The inner frame is a frame that does not or only slightly affects the air outlet of the fan. In particular, the inner frame in the region in which this radially surrounds the fan, preferably of a web construction. This minimizes the influence on the air flow. According to one embodiment, the inner frame has the shape of a polygonal, in particular an octagon. This shape has the advantage that the inner frame can be easily manufactured. In addition, in an odor filter, which is provided in the form of an octagon around the inner frame, the webs of the inner frame and optionally webs of the odor filter are aligned with each other and so the flow resistance that occurs through these components can be minimized. By providing the inner frame, the stability of the fan in the extractor device can be increased. In particular, this can be supported on the inner frame and a cover provided down.

Particularly preferably, the extractor device according to the invention represents a recirculation device. As a recirculation unit in this context, a fume extraction device is referred to, in which the air guide is limited to the space in which the extractor device is operated. In particular, in the recirculation unit only air outlets are provided, is discharged through the air after a previous cleaning with respect to deposits, such as grease and other impurities, as well as a cleaning with respect to odors, from the extractor device. Since an air duct to a room wall or ceiling in this embodiment of the extractor device is not required, the extractor device can be arranged freely in space.

The extractor device according to the invention may be an island extractor hood or a wall extractor hood. As island extractor hood is understood in this context, a fume extraction device, which is attached only to the ceiling of the room in which it is operated. In addition is An island range hood is generally accessible to the user from all sides. A wall extractor hood according to the invention is an extractor device which is fastened to a room wall. Preferably, the connection to the wall or the ceiling consists exclusively of fasteners or electrical connections. An air duct to the ceiling or the wall is not provided in the extractor device according to the invention.

With the present invention, a problem to be expected in the case of an odor filter arranged around the fan wheel has been overcome, namely the surge limit of the fan. The pumping limit is a specific range of the fan characteristic curve, in which the fan promotes little or no air or even blows it back into the intake area. The surge line is reached when a resistance, the removal of air obstructed so that it can not be overcome by the performance of the fan. Through the odor filter, in particular activated carbon filter, this resistance can be achieved. To solve the problem, the appropriate type of fan was determined, and the optimum shape of the activated carbon filter in terms of thickness and flow-through surface determined. The problem of the surge limit occurs only when a resistor to the fan, that is mounted in the blow-out area. Therefore, this problem has not yet occurred in the conventional prior art arrangements.

Another problem that could be solved with the present invention is a very optimal odor filter reduction level. This is particularly important if the extractor device is a circulating air unit, that is to say a pure recirculation unit. It has been shown that the largest possible through-flow surface of the odor filter or activated carbon filter is required. The ratio of the thickness of the filter and the surface that is streamlined is also important for the delivery volume. Therefore, the filter is mounted according to the invention after the fan, that is downstream of this. By the annular or polygonal arrangement also the largest surface can be realized.

Figur 1:

eine schematische Perspektivansicht einer Ausführungsform der erfindungsgemäßen Dunstabzugsvorrichtung;

Figur 2:

eine schematische Explosionsansicht einer weiteren Ausführungsform der erfindungsgemäßen Dunstabzugsvorrichtung;

Figur 3:

eine schematische Darstellung der Ausführungsform der Dunstabzugsvorrichtung nach Figur 2 ohne Geruchsfilter;

Figur 4:

eine schematische Darstellung eines Teils des Gestells der Ausführungsform der Dunstabzugsvorrichtung nach Figur 2;

Figur 5:

eine schematische Teilschnittansicht der Ausführungsform der Dunstabzugsvorrichtung nach Figur 2;

Figur 6:

eine schematische Seitenansicht der Ausführungsform der Dunstabzugsvorrichtung nach Figur 2; und

Figur 7:

eine schematische Perspektivansicht eines Lüfters nach einer Ausführungsform der erfindungsgemäßen Dunstabzugsvorrichtung.

The invention will be described again below with reference to the accompanying figures. Show it:

FIG. 1:

a schematic perspective view of an embodiment of the extractor device according to the invention;

FIG. 2:

a schematic exploded view of another embodiment of the extractor device according to the invention;

FIG. 3:

a schematic representation of the embodiment of the extractor device according to FIG. 2 without odor filter;

FIG. 4:

a schematic representation of a portion of the frame of the embodiment of the extractor device according to FIG. 2 ;

FIG. 5:

a schematic partial sectional view of the embodiment of the extractor device according to FIG. 2 ;

FIG. 6:

a schematic side view of the embodiment of the extractor device according to FIG. 2 ; and

FIG. 7:

a schematic perspective view of a fan according to an embodiment of the extractor device according to the invention.

In FIG. 1 is a schematic perspective view of an embodiment of the extractor device 1 according to the invention shown. The view is a perspective top view of the fume extractor 1. In this view, it can be seen that the fume extractor 1, a frame 10 and a first filter element, which is an odor filter 30 comprises. At the bottom of the extractor device 1 and therefore in FIG. 1 not visible, a second filter element, which is a grease filter 20, provided. The internal structure of the extractor device 1 will be described later with reference to FIGS FIGS. 2 to 7 described in more detail.

In the illustrated embodiment, a bottom plate 11, a holder plate 12 and a lid 14 can be seen as parts of the frame 10 of the extractor device 1. On the lid 14 are crossing reinforcing struts 141st intended. By these reinforcing struts 141, the stability of the lid 14 is ensured even with a small wall thickness of the material of the lid 14.

In the lid 14, a passage 142 is further provided. Through this passage 142 may, as in the FIG. 1 shown, an electrical connection for a fan, which is located in the interior of the frame 10, are guided and an axis of the fan by the cover 14 protrude upwards or fix the fan to the lid. The fan is in the in FIG. 1 can not be seen.

The lid 14 rests on the odor filter 30. In the in FIG. 1 In the embodiment shown, the odor filter 30 is formed by an octagonal grid 31, in which a rectangular opening is provided on each of the eight sides. Through these openings of the grid 31, which is arranged behind the grid 31 odor filter material 32 can be seen. This odor filter material 32 may extend continuously on the inside of the grid 31, that is to say cover the grid struts of the grid 31 and the rectangular openings formed by these struts. In this case, the odor filter material 32 may be, for example, an activated carbon filter designed as a mat. However, it is also possible to use individual filter cartridges filled with activated carbon pellets instead of such a mat. In this case, the size of the filter cartridges is selected so that it corresponds at least to the size of the openings in the grid 31 of the odor filter 30. As a result, the filter cartridges can be arranged in the interior of the grid and held by the grating 31. It is also possible that filter cartridges of the odor filter 30 are inserted through the lid 14 or corresponding openings on the top of the grid 31 through this. This makes it easy to change individual filter cartridges.

In FIG. 2 a further embodiment of the extractor device 1 according to the invention is shown. This embodiment essentially corresponds to that in FIG FIG. 1 shown embodiment. However, in the embodiment according to FIG. 2 the odor filter 30 is not designed as an octagonal body but as a circular ring. Accordingly, the lid 14 of the extractor device 1, which is placed on the odor filter 30, has a circular shape. The further construction of the embodiment according to FIG. 2 corresponds to the structure of the embodiment according to FIG. 1 ,

In particular, an inner frame 13 is provided inside the odor filter 30. This has an octagonal shape. The inner frame consists of frame webs which describe the respective side surfaces of the octagonal inner frame 13. At the top of the inner frame 13 inwardly projecting mounting flanges 134 are provided, via which the lid can be connected to the inner frame 13. On the lower side of the openings of the inner frame 13 further outwardly projecting flanges 131 are provided. Finally, 13 inwardly projecting mounting flanges 132 are provided on the underside of the inner frame. The function of the receiving flanges 131 and the mounting flanges 132 will be described later with reference to FIGS FIGS. 3 to 5 described in more detail.

As a further part of the frame 10, a holder plate 12 is provided. The holder plate 12 has a circular shape in the illustrated embodiment and has a recess 121 in its center. The recess 121 corresponds to the shape and size of the projection of the inner frame 13. In particular, the recess 121 has an octagonal shape. The diameter of the holder plate 13 corresponds at least to the diameter of the annular odor filter 30. Below the holder plate 12, a bottom plate 11 is arranged. This bottom plate 11 is used in particular for fastening the grease filter 20 to the underside thereof. Also in the bottom plate 11, a recess 111 is provided in the middle. An inlet nozzle 41 of the fan 40 can be guided through this recess 111 and its underside can be connected to the base plate 11 or at least abut against it. Inside the inner frame 13, finally, a fan 40 is provided. Of this fan 40, only the lower part of the fan wheel 42 can be seen in the illustration shown. It is according to the invention also possible that the inlet nozzle 41 is not a separate component, but is integrated in the fan 40 or in the frame 11.

An embodiment of the fan wheel 42 of the fan 40 is in FIG. 7 shown schematically. This view provides a bottom view of the in FIG. 2 The fan wheel 42 has an axis of rotation A about which the fan wheel 42 rotates clockwise in the view shown. As a result, a running direction L of the fan wheel 42 is generated in a clockwise direction. On the outer sides of the fan 42 blades 421 are distributed over the circumference. These are counterclockwise curved. At the in FIG. 7 shown impeller 42 is thus a fan of a fan with backward curved blades.

Below the bottom plate 11 of the frame 10, a grease filter 20 is provided (see FIG. 2 ). This consists of a first horizontally arranged filter unit 21, which may for example constitute a filter cassette made of expanded metal or a non-woven mat. At the horizontally arranged filter unit 21 is followed by a vertically upwardly facing facing 22 at the edges. This veneer 22 has over its surfaces vertically extending slots 221. On the inside of the veneer 22, a grease filter material is provided, which for reasons of better visibility in the FIG. 2 was omitted. At the top of the veneer 22 fastening tabs 222 are provided, via which the grease filter element 20 can be connected to the bottom plate 11 of the frame 10 and secured thereto.

In FIG. 3 is a more detailed view of the frame 10 of the extractor device 1 according to FIG. 2 shown. The odor filter is omitted in this view. As can be seen from the in FIG. 2 shown, the fan 40 is aligned so that the in FIG. 7 shown open front of the fan wheel 42 facing down. In the open side of the fan wheel 42, the inlet nozzle 41 is introduced.

The inlet nozzle 41 protrudes through the recess of the bottom plate 11 of the frame 10 and may be attached to this bottom plate 11. In addition, the inner frame 13 is also connected to the bottom plate 11 via the attachment tabs 132 provided on the underside thereof. At the receiving flanges 131 provided at the lower edge of the rectangular openings in the inner frame 13, the inner frame 13 is connected to the holder plate 12. At the bottom of the bottom plate 11 of the grease filter 20 is provided. In the in FIG. 3 As shown, the vertically extending grease filter material 23 can be seen behind the veneer 22 through the slots 221.

As in FIG. 4 More specifically, the inner frame is continuous in the area between the lower edge of the rectangular openings in the inner frame 13 and the lower edge of the inner frame 13. In particular, no openings for air guidance or for the air passage are provided in this area; only holes for fixing individual components can be found in this Be provided area. Thus, after the mounting of the frame 10, the area between the holder plate 12 and the bottom plate 11 is formed by the lower part of the inner frame 13 in which no openings are provided. As a result, the interior of the inner frame 13 is closed by the cover 14 upwards and through the bottom plate 11 and the lower part of the inner frame 13 down or on the lower sides.

In contrast, over the entire circumference of the fan wheel 42, apart from the frame webs 133 of the inner frame 13 between the cover 14 and the holder plate 12, there is no component which could impair the air flow from the fan wheel to the odor filter 30 surrounding the inner frame 13.

As in FIG. 5 schematically indicated, the fan 40 is held by the reinforcement 141 of the lid 14 and by the lid 14 (not shown in the figure). The odor filter 30, of which in the FIG. 5 only the grid 31 is shown sitting on the holder plate 12 of the frame 10.

With reference to FIG. 6 In the following, the operation of the embodiments of the extractor device shown in FIGS FIGS. 1 to 5 are shown, explained in more detail.

Below the extractor device 1 resulting vapor and vapor rise with a substantially vertically extending main flow direction H. These fumes and vapor thus hit the horizontal grease filter unit 23 on the underside of the grease filter 20 of the extractor device 1. In addition, at least a portion of the fumes and vapors will reach the slots 221 of the veneer 22 and through this to the provided behind the facing 22 filter material 23 arrive. Inside the extractor device 1, the fan 40 is activated during operation of the extractor device 1. In this case, the fan wheel 42 is rotated by an electric drive and thus generates a suction effect. By this suction, the vapor is sucked through the grease filter 20 to the inlet nozzle 41 and passes through them into the interior of the fan wheel 42. Via the fan blades 421, which are provided distributed over the periphery of the fan wheel 42, the air from the interior the fan wheel 42 is discharged radially.

The thus discharged air, which is already pre-cleaned by the grease filter 20, passes through the openings of the inner frame 13 without excessive flow losses and is pressed against the inside of the odor filter 30, in particular against the provided inside the grid 31 odor filter material 32. By this pressure, the air is forced through the odor filter material 32 and thus cleaned. Thus, over the entire circumference of the odor filter 30, an air of particularly good air quality is discharged into the room in which the extractor device 1 is operated. An escape of air down, bypassing the odor filter 30 is prevented by the bottom plate 11 and the holder plate 12. An escape of air upward, bypassing the odor filter 30 is prevented by the cover 14.

Although in the figures, a lining surrounding the frame and the odor filter is not shown, it is within the scope of the invention to provide such a covering. This may for example consist of plastic or sheet metal and be designed so that it is permeable to air, at least in the areas of the odor filter 30, for example, has openings or slots in this area. The attachment of such a panel can be done for example on the bottom plate 11 or the holder plate 12 of the frame 10. The bottom plate 11 can also serve for fastening, for example, a plate-shaped vapor shield (not shown). By this, the vapor is more reliably directed to the grease filter 20 and thus in the extractor device 1. In addition, an immediate blowing of the user of the extractor device 1 can be avoided by the Wrasenschirm exiting from the odor filter 30 air.

With the present invention, it is thus possible cooking fumes in recirculation mode, that is, in an operation in which contaminated air is not discharged to the outside but filtered and returned to the ambient air to clean with the help of activated carbon. The device can only be operated in recirculation mode. In contrast to devices of the prior art, in which subsequently or additionally installed filters are used, in the invention, the Fordervolumen is not deteriorated and the noise levels of the extractor device are also not adversely affected.

Preferably, in the present invention, one or more activated carbon filters are arranged annularly around the fan. This means that the filters are located after the fan and blown directly by the fan. As a result, a very large flow area of the filter is realized. This in turn is crucial for good readings in odor reduction measurement. Furthermore, by this arrangement, the results of the delivery volume measurement significantly better than those known from the prior art. Another important point of the invention is the compact design of the extractor device of the invention, which is also referred to as a recirculation unit. The annular arrangement of the activated carbon filter, a relatively low height is guaranteed.

The advantages according to the invention can be achieved particularly well if the grease filter is located at a suitable distance in front of the inlet nozzle of the fan, for example 20 mm from the inlet nozzle of the fan. The odor filter (s) preferably sit after the fan in direct air flow, that is, with a fan in the radial direction, not in the axial direction as in the solutions of the prior art. Due to the high resistance represented by the activated carbon filters, the use of a backward curved fan with appropriate air performance is advantageous. Furthermore, a suitable inlet nozzle is preferably provided in front of the fan. A thickness of the odor filter, which has proved to be advantageous is 20mm. The flow-through surface of the filter is as large as possible in the extractor device according to the invention.

With the present invention, the problem can be overcome to realize a combination of high delivery volume to very good odor reduction to lowest possible noise levels. It has been shown that these values could not be realized due to the previous design of recirculation units.

LIST OF REFERENCE NUMBERS

1

Exhaust hood

10

frame

11

baseplate

111

recess

12

holder plate

121

recess

13

inner frame

131

receiving flanges

132

mounting flange

133

frame stay

134

mounting flange

14

cover

141

reinforcing struts

142

passage

20

grease filter

21

horizontal grease filter unit

22

facing

221

slot

222

bracket

23

Grease filter material

30

odor filter

31

grid

32

Odor filter material

40

Fan

41

Inlet

42

fan

421

shovel

A

Rotary axis fan

L

Direction of rotation fan wheel

H

main direction

Claims (15)

Vapor extraction device comprising a fan (40) and at least one filter element (30) at least partially surrounding the fan (40), characterized in that a filter element upstream of the fan (40) constitutes a grease filter (20) and at least one fan (40) is provided ) at least partially surrounding filter element (30) is connected downstream of the fan (40) and an odor filter (30). Vapor extraction device according to claim 1, characterized in that the odor filter (30) is the outlet opening of the extractor device (1) or an odor filter (30) surrounding the outlet opening of the extractor device (1) is connected upstream. Vapor extraction device according to one of claims 1 or 2, characterized in that the odor filter (30) in the discharge direction of the fan (40) is arranged. Vapor extraction device according to one of claims 1 to 3, characterized in that the odor filter (30) is constructed in the form of an octagon. Vapor extraction device according to one of claims 1 to 4, characterized in that the odor filter (30) has a thickness in the range of 15mm to 25mm, in particular a thickness of 20mm. Vapor extraction device according to one of claims 1 to 5, characterized in that the grease filter (20) has at least two mutually angled filter surfaces (21, 22, 23). Vapor extraction device according to claim 6, characterized in that the grease filter (20) comprises a horizontal (21) and an area angled upwardly to the horizontal region (22, 23). Vapor extraction device according to one of claims 1 to 7, characterized in that the extractor device has a cover (14), are provided at least partially odor filter. Vapor extraction device according to one of claims 1 to 8, characterized in that the fan (40) is designed as a radial fan. Vapor extraction device according to claim 9, characterized in that the fan (40) has backwardly curved blades (421). Vapor extraction device according to one of claims 1 to 10, characterized in that the fan (40) is a single-flow fan. Vapor extraction device according to one of claims 1 to 11, characterized in that the fan (40) without fan housing in the extractor device (1) is provided. Vapor extraction device according to one of claims 1 to 12, characterized in that it comprises an inner frame (13) for mounting the fan (40). Vapor extraction device according to one of claims 1 to 13, characterized in that it represents a circulating air device. Vapor extraction device according to one of claims 1 to 13, characterized in that the extractor device (1) is an island extractor device or a wall-extractor device.

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