EP2677242B1 - Device for extraction of air - Google Patents

Description

The invention relates to a device for discharging air.

Such devices for discharging air are used in particular in kitchens in order to extract and dissipate the cooking fumes generated over a hotplate or a stove, to clean them if necessary (e.g. to filter them) and to return them to the room. When used in kitchens, there are so-called extractor hoods. Cooker hoods can be divided into two groups, depending on the type of air duct. In the case of so-called exhaust hoods, the exhaust air is routed to the outside via a pipeline and is thus extracted from the room with the hotplate and exhaust hood and released into the atmosphere outside the building. Grease separation is usually also provided for exhaust hoods. With these extractor hoods, odors and dirt deposits in the cooking area and in the building as a whole can be avoided. In so-called recirculation hoods, the air sucked in by the extractor hood is additionally cleaned of odors by a filter or similar device and then returned to the cooking space.

Conventional extractor hoods of both groups generally have a separating device for separating the dirt particles and a fan or blower device for generating an air flow and for removing the exhaust air. The dirt particles can be separated by means of separation elements and / or a suitable guidance of the air flow. The separator removes almost all solid particles, such as fat and dirt particles, from the exhaust air before the exhaust air enters the fan unit.

In a known extractor hood, the exhaust air or the vapors is taken into the extractor hood via an inlet opening in a suction area thereof. The entire area facing the exhaust air source is referred to here as the suction area. In this extractor hood, the inlet opening is located near the forehead area, a free side of the extractor hood being defined as the forehead area, which does not adjoin a wall of the room and to which, for example, control elements are attached, which can be reached by a person cooking on the end face.

Since the exhaust air usually rises vertically upwards, not all of the exhaust air is sucked straight from the exhaust air source into the inlet opening, but part of the exhaust air will flow along the suction area before it is captured by the inlet opening. This is particularly the case with so-called headroom hoods - in which the extractor hood has an inclined suction area in the forehead area - when cooking on hotplates (e.g. on the hotplates facing the wall) that are not directly below the inlet opening. In the case of so-called island hoods (in contrast to the wall hoods described above) with two possibly inclined suction areas in two forehead areas, what has been said above applies when cooking on medium-sized hobs. If the warm, moisture-saturated exhaust air comes into contact with the colder suction area of the extractor hood, moisture can condense out of the exhaust air and water droplets can form in the suction area. This formation of condensate is undesirable since the condensed water, possibly contaminated with dirt particles, can drip onto the hob and contaminate food. This problem can also occur with a horizontally oriented suction area.

The invention has for its object a device for discharging air in which condensate formation in the suction area is restricted or avoided.

One out DE 102 09 735 A1 Known extractor device already solves this problem by providing an outlet opening so that an escaping fluid flow sweeps over the suction area.

The object is achieved according to the invention by a device for discharging air with the features of claim 1, or with the features of claim 3. According to the invention, at least one second outlet opening, which is either in the center of the suction area or near one - the at least one free end area opposite - side wall provided, the at least one second outlet opening is also designed such that an emerging fluid stream sweeps over the suction area and can be sucked in through the at least one slot-shaped inlet opening.

The invention is therefore applicable on the one hand to wall hoods with an end region and an inlet opening. According to the invention, these wall hoods have a second outlet opening, which is provided in the suction area near a side wall - opposite the free end area - the second outlet opening being designed such that an emerging fluid flow sweeps over the suction area and through the slit-shaped inlet opening is suckable. On the other hand, the invention is also applicable to island hoods with at least two end areas and at least two inlet openings. According to the invention, these island hoods have a plurality of second outlet openings which are provided in the center of the suction area, the plurality of second outlet openings being designed in such a way that the emerging fluid streams sweep over the suction area and can be sucked in through the plurality of slot-shaped inlet openings.

The at least one fluid stream forms a layer under the suction area and in this way prevents rising damp exhaust air from coming into direct contact with the suction area. At the same time, the rising exhaust air is deflected and moved with the fluid flow in the direction of the inlet opening. This prevents moisture from falling out. If, in rare cases, small water droplets do form, they are evaporated again by the fluid flow and the suction area is dried again.

Further details and advantages of the invention result from the subclaim.

It has been found that extractor hoods work most effectively when a very high air speed is reached in the border area between the exhaust air source and the open space. Therefore, a quasi upward flowing, rapidly moving air curtain should be created across the entire width of the extractor hood in this area. The at least one inlet opening is therefore slit-shaped, runs parallel to the at least one free forehead area and extends almost over the entire width of the at least one free forehead area.

On the one hand, the fluid flow should prevent the exhaust air from coming into direct contact with the intake area, on the other hand, however, it must not accelerate the exhaust air that is carried along so that it is pushed beyond the inlet opening and therefore can no longer be extracted through it. The fluid flow emerging from the at least one second outlet opening is therefore dimensioned according to the invention such that the fluid flow is between 2% and 10%, in particular between 3% and 5%, of the volume flow of the sucked-in exhaust air in the blow-off duct. The exact ratio between the volume flow of the intake air and the fluid flow depends on the design of the exhaust hood, e.g. B. size of the suction area, inclination of the suction area, guiding the partial flow before exiting the second outlet opening, dimensioning of the second outlet opening, etc.

The fluid flow can be generated by its own fan, which either draws air from the outside of the building or air from the room. In both cases, the expenditure on equipment is relatively high. It is therefore advantageous in the flow direction after the fan device to provide a sub-device for dividing the volume flow of the intake air. In this way, a good result can also be achieved without an additional fan. Furthermore, an automatic adjustment of the fluid flow to the volume flow of the sucked-in exhaust air can be realized without additional control effort.

According to the invention, at least one first exhaust air duct for guiding a first partial flow of the sucked-in exhaust air and at least one second exhaust air duct for guiding a second partial flow of the sucked-in exhaust air are provided, the first partial stream and the second partial stream being separable from one another by means of a separating element. The separating element can be designed, for example, as a simple separating plate on the blow-off side of the fan device. The first partial flow of the sucked-in exhaust air, the actual main flow, can then be fed to the first outlet opening, from which it either leads to the outside of the building or is returned to the room via an odor filter, in most cases an activated carbon filter.

According to the invention, the second exhaust air duct deflects the partial flow and leads it to the at least one second outlet opening. The deflection should take place in such a way that as little flow energy as possible is destroyed. A deflection of approximately 180 ° is necessary directly after the fan device. Before the second exhaust air duct opens into a second outlet opening, a further deflection must take place, which ensures that the fluid flow is not directed vertically downwards, but rather sweeps over the suction area.

The entire suction area should be covered by the fluid flow if possible. The at least one second outlet opening is therefore formed in the form of a gap. The second outlet opening advantageously runs parallel to the suction opening and has approximately the same length. As a result, the entire fluid stream emerging from the second outlet opening can be received by the suction opening.

The fluid flow is intended to capture all of the rising exhaust air laden with moisture. The gap of the at least one second outlet opening therefore extends parallel to the side wall - opposite the at least one free end region. If the device is designed as a wall hood, the distance of the gap to the wall to which the device is attached should be as small as possible.

The width of the gap must be dimensioned so that the available volume flow in the second exhaust air duct generates a fluid stream below the intake area, the speed of which is high enough to guide the rising exhaust air to the intake opening without passing it past the intake opening to press. Ideally, the width of the gap is between 2 and 5 mm. It mainly depends on the volume flow in the second exhaust air duct.

The suction area advantageously has at least two partial surfaces which together form an obtuse angle. This allows the edge in the forehead area of an extractor hood to be pulled upwards, so that this edge protruding into the room does not hinder the headroom of a person cooking. The part of the suction area of these headroom hoods directed towards the forehead area is consequently not only the exhaust air source but also also facing the boiling person, the perpendicular pointing to this partial area between the exhaust air source and the boiling person. With these extractor hoods, special care must be taken to ensure that no condensate forms at the intake area. Condensed water would run down the sloping surface and collect at the connecting edge of the two partial surfaces. Since this connecting edge is a drip edge, the risk of water drops loosening is particularly high at this point. The fluid flow in these headroom hoods must therefore be particularly well matched to the design.

The so-called island hoods are used above standing cooking islands that are accessible from at least two sides. These extractor hoods therefore also have two opposite end areas. In order to be able to record all the exhaust air rising from the hotplates here without the risk of condensation, a slot-shaped inlet opening and two second outlet openings are provided on two opposite sides of the intake area and centrally between the two slot-shaped inlet openings.

In these extractor hoods, two fluid flows are to be generated in the middle, which are directed from the center in opposite directions to the outside. The second outlet openings are therefore designed in such a way that the respectively emerging fluid flow sweeps over the suction area between the respective second outlet opening and the closest inlet opening in such a way that it can be sucked in through this nearest inlet opening. This ensures that exhaust air rising on both end faces is captured and sucked in, but also that condensation between the two intake openings is avoided.

These island hoods can also be designed as headroom hoods. In this case, the suction area advantageously has three partial surfaces, the outer partial surfaces each forming an obtuse angle with the central partial surface and the inlet openings in the outer partial surfaces and the second outlet openings in the central partial surface. The statements made above regarding the increased risk of dripping of condensate collected also apply here. Here both fluid flows must be set accordingly.

Further details and advantages of the invention result from the description of an exemplary embodiment, which is explained in detail with reference to the drawing.

Fig. 1

eine als Wandhaube ausgebildete Ausführungsform der erfindungsgemäßen Vorrichtung im Schnitt,

Fig. 2

die Aufteilung des Volumenstroms in zwei Teilströme entsprechend dem Ausführungsbeispiel nach Fig. 1,

Fig. 3a

die Erzeugung des Fluidstroms nach dem Ausführungsbeispiel aus Fig. 1, sowie

Fig. 3b

ein Detail aus Fig. 3a

Fig. 4

die Einlassöffnung mit Abscheideeinrichtung entsprechend dem Ausführungsbeispiel nach Fig. 1,

Fig. 5

ein als Inselhaube ausgebildetes weiteres Ausführungsbeispiel der Erfindung im Schnitt,

Fig. 6

die Aufteilung des Volumenstroms in zwei Teilströme entsprechend dem Ausführungsbeispiel nach Fig. 5 und

Fig. 7

die Erzeugung der Fluidströme in dem Ausführungsbeispiel nach Fig. 5 im Detail.

It shows:

Fig. 1

an embodiment of the device according to the invention, designed as a wall hood, in section,

Fig. 2

the division of the volume flow into two partial flows according to the embodiment Fig. 1 ,

Fig. 3a

the generation of the fluid flow according to the embodiment Fig. 1 , such as

Fig. 3b

a detail out Fig. 3a

Fig. 4

the inlet opening with separating device according to the embodiment Fig. 1 ,

Fig. 5

a further embodiment of the invention designed as an island hood in section,

Fig. 6

the division of the volume flow into two partial flows according to the embodiment Fig. 5 and

Fig. 7

the generation of the fluid streams in the embodiment Fig. 5 in detail.

In the following description, the same reference numbers are used for the same and equivalent parts.

Fig. 1 shows an embodiment of a device 1 according to the invention for discharging air, in particular exhaust air 5, from an exhaust air source (here a saucepan 6). The device 1 can be provided as an extractor hood, for example as an exhaust hood or a recirculation hood. In Fig. 1 an exhaust hood is shown that has no odor filter. Since the extractor hood 1 has only one end region 21 and is attached with its rear wall 3 to a room boundary wall 4, this is a so-called wall hood.

The device 1 designed as an extractor hood comprises a housing 2 with an end region 21, a side wall (rear wall 3) opposite the end region and a suction region 20. The complete underside of the extractor hood 1, which faces the exhaust air source 6, is referred to as the suction region 20, the Exhaust source 6 e.g. stands on a hob or stove (not shown here).

How Fig. 1 can be removed, the suction region 20 in this embodiment has two partial surfaces 20a and 20b which are at an angle to one another, the partial surface 20a being oriented horizontally. The partial surface 20b, on the other hand, is arranged such that the edge which is furthest into the space in front of the extractor hood is at the greatest possible height. This measure creates a so-called headroom hood, in which a cooking person does not collide with the suction area 20 and has an unobstructed view of the exhaust air source, that is to say the cooking pot 6.

A slit-shaped inlet opening 30 is provided in the suction area 20 of the extractor hood 1, so that the air or exhaust air 6 provided for discharge can be sucked in. The inlet opening 30 runs parallel and at a short distance from the edge of the partial surface 20b of the suction area which projects furthest into the space. This arrangement ensures that all vapors emanating from the cooking pot 6 can also be captured and do not flow past the suction area 20 into the room.

In the extractor hood 1, in the direction of flow after the inlet opening 30, there is a separating device 40 designed with positive guidance means (see Fig. 4 ) arranged, which serves to separate suspended particles from the exhaust air. The exhaust air flow is directed through the positive control means in such a way that the exhaust air flow is strongly deflected. Similar to a cyclone, the mass particles, e.g. B. condensed water droplets, dirt particles or fat particles pressed out and settle on the positive control means. The cleaned exhaust air flow continues to flow in the direction of the fan device 50. After passing through the separating device 40, the exhaust air flow sucked in hardly has any suspended particles, so that the fan device 50 only comes into contact with very little contaminated exhaust air and therefore cannot become dirty.

The fan device 50 builds up a negative pressure in the exhaust air delivery channel, which draws the cleaned exhaust air from the separating device 40. The blow-off duct 61 is provided downstream of the fan device 50. This guides the entire intake air and forms the volume flow L.

Since the exemplary embodiment shown is an exhaust hood, in which the exhaust air conveyed by the fan device 50 is passed to the outside of the building without a filter, there is hardly any pressure increase after the fan device 50, by means of which the volume flow L could be separated into two partial flows. A separating element 70 is therefore provided, which divides the blow-off duct 71. In this exemplary embodiment, the separation is consequently achieved via the flow of the volume flow L.

The separating element 70 is aligned parallel to the flow direction of the volume flow L and divides the blow-off duct 61 at its upper end in such a way that a first exhaust air duct 62 and a second exhaust air duct 63 are created. The first exhaust air duct 62 leads to a first outlet opening 31, while the second exhaust air duct 63 leads to a second outlet opening 32. The separating element 70 is arranged such that the first exhaust air duct is charged with approximately 97% of the volume flow L and the second exhaust air duct 63 with approximately 3% volume flow L. The resulting primary flow L1 in the exhaust air duct 62 thus behaves approximately to 32: 1 with the resulting secondary flow L2 in the second exhaust air duct 63.

This ratio ensures that the fluid flow F2 emerging from the second outlet opening 32 forms a kind of barrier layer under the suction area 20, which prevents the rising exhaust air 5 from coming into direct contact with the suction area 20. It is therefore also impossible for any moisture emerging from the rising vapors to condense on the suction region 20 and, for example, to drip into the pot underneath. At the same time, however, this ratio also prevents the fluid flow F2 from being so strong that it drives beyond the inlet opening and the rising exhaust air 5 in the front region 21 leads past the extractor hood 1.

The first outlet opening 31 is formed by the exhaust port 33. Here, for example, a hose can be attached that leads directly into the open via a wall opening.

The second outlet opening 32 is provided on the underside of the extractor hood 1 in the suction area 20 facing the exhaust air source 6. The fluid flow F2 emerges from the housing 2 of the extractor hood 1 via the second outlet opening 32. The second outlet opening 32 forms a slot which is arranged parallel to the inlet opening 30 and runs close to the rear wall 3. The slot is designed such that the exiting fluid flow F2 is inclined at approximately 15 ° with respect to the horizontal. The emerging fluid flow F2 thus sweeps over the entire width of the suction area and is completely sucked off again through the likewise slit-shaped inlet opening 30.

The separating element 70 is provided here as an angled element, so that the secondary flow L2 divided by the volume flow L is directed out of the fan device 50 into the second exhaust air duct 63. An angle of approximately 45 ° is preferably provided here (see Fig. 3 ), so that the secondary current L2 does not hit a wall perpendicular to the direction of flow.

The second exhaust air duct 63 runs between the rear wall 3 of the extractor hood 1 and a wall of the housing of the fan device 50, or it is formed by these walls and the side walls of the extractor hood 1 that are not visible in the sectional view. The cross section of the first exhaust air duct 62 is larger than the cross section of the second exhaust air duct 63, since the majority of the volume flow L is actually to be blown out via the first outlet opening 31, while only a small part is to be blown out of the second outlet opening 32.

Since water droplets which have condensed out of the exhaust air 5 due to cooling have already been separated off by the separating device 40, the fluid stream F2 is relatively dry and can even absorb moisture again. This is particularly important if the extractor hood was only switched on after the start of cooking and water drops have already formed on its suction area 20. These drops of water are then slowly broken down again by the fluid flow F2, so that even drying of the suction region 20 becomes possible.

Fig. 2 shows the division of the volume flow L into the primary flow L1 and the secondary flow L2 from the exemplary embodiment Fig. 1 in detail. The separating element 70 can be clearly seen here, which is arranged in such a way that the secondary flow L2 is also separated without back pressure, since the separating element plunges into the volume flow L in parallel. Only in the upper region is the separating element 70 angled, so that the direction of the secondary current L2 is influenced and changed. The 180 ° deflection of the secondary current L2 creates a slight dynamic pressure to the left of the separating element 70, which influences the relationship between the primary current L1 and the secondary current L2, but which can be taken into account when positioning the separating element 70.

The Figures 3a and 3b illustrate the transition from the guided secondary flow L2 through the second outlet opening 32 into the fluid flow F2 which is only passed through the suction region 20. The second outlet opening 32 is provided in the horizontally oriented partial surface 20a of the suction region 20 near the rear wall 3. It is oriented in such a way that a fluid flow F2 inclined at an acute angle to the horizontal is produced, which moves along the underside of the suction area. It forms a barrier layer which keeps the rising exhaust air 5 from direct contact with the suction area. The fluid flow F2 flows around the edge between the partial surfaces 20a and 20b and moves towards the slot-shaped inlet opening 30. The obliquely upward partial surface 20b can otherwise with a decorative element 24, z. B. a glass pane in which a recess is provided for the inlet opening. The disc can be provided as a flat surface or as a curved element.

In addition, a heating device could be provided on the suction area in order to prevent the formation of condensate or to remove the condensate formed. Certain coatings can also be provided for the partial surfaces or for the decorative element, which counteract the formation of condensate by the vapors.

Fig. 4 shows in detail the area of the partial surface 20b in which the inlet opening 30 is provided. The cutout in the decorative element 24 can be clearly seen here.

The separating device 40 has a strongly curved surface, so that the exhaust air flow is also strongly deflected. With this deflection, the solid and liquid components of the exhaust air migrate outwards and settle on the curved surfaces.

In Fig. 5 a second embodiment of the invention is shown. The exemplary embodiment is a circulating air hood 7, which is designed as an island hood. For the same and equivalent parts, the same reference numerals are used as in the embodiment Fig. 1 used.

In contrast to the exhaust hood 1, the recirculation hood 7 is in Fig. 1 the exhaust air is not discharged outside, but is returned to the room. In order to be able to filter out odors before they are returned to the room, an odor filter 13 is provided, through which the exhaust air must first flow. This odor filter 13 has a layer of activated carbon, through which the exhaust air must pass.

This resistance in the flow path of the primary current L1 causes a dynamic pressure upstream of the filter 13. It is therefore not necessary to provide a separating element in order to separate the primary current L1 and secondary current L2. Due to the dynamic pressure, the exhaust air is pressed into the first exhaust air duct 62 and the second exhaust air duct 63 in the desired ratio even without a separating element.

An island hood is usually used over a cooking island that can be worked on from two sides. The extractor hood 7 therefore has two opposite end areas. The end regions 21a and 21b are symmetrical.

The suction area 20 is divided here into three partial areas, a central, horizontally oriented partial area 20a and two symmetrical partial areas 20b and 20c adjoining it on both sides. The two outer partial surfaces 20b and 20c are - as in the exemplary embodiment according to Fig. 1 - Pulled diagonally upwards to give a user more headroom and to ensure a clear view of the stove surface.

The extractor hood 7 has two inlet openings 30a and 30b, each of which is arranged near the respective free end region 21a or 21b. The exhaust air 5 is consequently - in contrast to the embodiment Fig. 1 - Sucked off on both sides of the extractor hood 7.

The second exhaust air duct 63 is guided here in such a way that it can supply two second outlet openings 32a and 32b in the central partial surface 20a with the secondary flow L2. The two second outlet openings 32a and 32b are located in the central partial surface 20a and are designed such that a fluid flow F2a or F2b is formed in the direction of the end region 21a or 21b. The second outlet openings 32a and 32b are located here in the middle in the suction region 20 with only a small distance from one another. The two outward-directed fluid streams also entrain exhaust air, which would otherwise strike the central partial surface 20a between the two second outlet openings 32a and 32b and, under certain circumstances, would leave water droplets there.

The two fluid flows F2a and F2b are suctioned off via the corresponding inlet opening 30a and 30b, respectively. In the flow direction behind the inlet openings, two independent separating devices, which are not described here in greater detail, are also provided. The fan device 50 is designed here in such a way that sufficient exhaust air 5 can be extracted via both inlet openings 30a and 30b.

Fig. 6 shows the separation into the primary current L1 and the secondary current L2 in detail. Due to the flow resistance of the filter 13, a dynamic pressure builds up between the fan device 50 and the filter 13. This dynamic pressure also pushes exhaust air into the second exhaust air duct 63 without a separating element. The ratio between primary current L1 and secondary current L2 is set here exclusively via the ratio of the input cross sections.

In Fig. 7 the generation of the two fluid flows F2a and F2b is shown again in detail. As in the embodiment Fig. 1 the respective second outlet opening is designed such that the fluid flow is directed obliquely downwards.

It must also be mentioned that the present disclosure can of course also be applied to extractor hoods whose suction area facing the exhaust air source has only a horizontally oriented surface, and which are therefore not designed as headroom hoods. In this case, both the inlet opening or the inlet openings and the second outlet opening or the second outlet openings are arranged in the one horizontally oriented surface of the suction region.

Reference symbol list:

1

Extractor hood, wall hood, exhaust hood

2nd

casing

3rd

Back wall

4th

Room boundary wall

5

Exhaust air

6

Exhaust air source

7

Extractor hood, island hood, air circulation hood

20th

Suction area

20a, b, c

Partial areas

21st

Forehead area

24th

Decorative element

30th

Inlet opening

31

First outlet opening

32

Second outlet opening

33

Exhaust port

40

Separator

50

Fan device

60

Air delivery channel

61

Blow-off duct

62

First exhaust duct

63

Second exhaust duct

70

Separating element

L1

Primary current

L2

Secondary current

Claims (3)

1. A device (1) for discharging exhaust air (5) generated on a hob (6), comprising:

   a housing (2) having a rear wall (3) for fastening the device (1) to a room wall (4), a front wall area (21) opposite the rear wall (3) and a bottom side having a suction area (20) facing the hob (6),

   wherein the suction area (20) has two partial surfaces (20a, 20b) at an angle to each another, wherein a first partial surface (20a) extends from the rear wall (3) and is aligned horizontally, and a second partial surface (20b) arranged at an obtuse angle to the first partial surface (20a), such that the head of an operator of the hob (6) does not collide with the second partial surface (20b),

   a slot-shaped inlet opening (30) formed in an upper area of the second partial surface (20b) and extending in parallel to a horizontal end edge of the second partial surface (20b),

   separating means (40) arranged in an exhaust air conveying channel (60) and adjacent to the inlet opening (30), said separating means (40) having positive guidance means formed by way of a curved surface for separating particles from the exhaust air (5) carried therewith,

   a fan means (50) for sucking exhaust air (5) via the inlet opening (30) and generating a volume flow (L) within an exhaust duct (61) communicating with the fan device (50), which exhaust duct (61) being arranged downstream of the fan device (50),

   a separating element (70) arranged in an upper end of the exhaust duct (61) and dividing the upper end of the exhaust duct (61) into a first exhaust air duct (62) and a second exhaust air duct (63), wherein the first exhaust air duct (62) communicates with a first outlet opening (31) and the second exhaust air duct (63) communicates with a second outlet opening (32),

   wherein the separating element (70) has a lower region arranged in parallel to the direction of flow of the volume flow (L), and an angled upper region supporting a deflection of a secondary flow (L2) separated from the volume flow (L) into the second exhaust air duct (63), and wherein the separating element (70) is arranged such that the secondary flow (L2) supplied to the second exhaust air duct (63), comprises 2% to 10% of the volume flow (L),

   wherein the second exhaust air duct (63) runs between the rear wall (3) of the housing (2), the side walls thereof and a housing wall of the fan means (50), and

   wherein the second outlet opening (32) is formed as a slot in the first partial surface (20a) and is arranged in parallel to the inlet opening (30), and is configured in such a way that a fluid stream (F2) emerging from the second outlet opening (32) has an angle of inclination which, with respect to the horizontal of the first partial surface (20a), is approximately 15°.
2. The device according to claim 1, characterized in that the width of the slot (32) is between 2 and 5 mm.
3. A device (7) for discharging exhaust air (5) generated on a hob (6), comprising:

   a housing (2) having two opposite symmetrical end regions (21a; 21b) and a bottom side having with a suction area (20) facing the hob (6),

   wherein the suction area (20) has a central, horizontally oriented partial surface (20a) and two outer partial surfaces (20b; 20c) each arranged at an obtuse angle to the central partial surface (20a), such that the head of an operator of the hob (6) does not collide with one of the two outer partial surfaces (20b; 20c), wherein

   each of the two outer partial surfaces (20b; 20c) has a slot-shaped inlet opening (30a; 30b), each formed in an upper area of the outer partial surface (20a; 20b) and extending in parallel to a horizontal end edge of the outer partial surface (20b; 20c),

   a separating means arranged within an exhaust air conveying channel of the housing (2) and adjacent to said two inlet openings (30a; 30b), the separating means having positive guidance means formed by way of a curved surface for separating particles carried in the exhaust air (5),

   a fan means (50) for extracting exhaust air (5) via said two inlet openings (30a; 30b) and for generating a volume flow in an exhaust duct arranged downstream of the fan means (50) and communicating therewith,

   a filter (13) arranged downstream of the fan means (50) and having an activated carbon layer,

   a first exhaust air duct (62) for receiving a primary flow (LI) separated from the volume flow, passing said primary flow through the filter (13) and returning the same via a first outlet opening into a room within which the device is operated, and

   a second exhaust air duct (63) arranged between the fan means (50) and said filter (13) and for receiving a secondary flow (L2) separated from the volume flow, wherein

   the second exhaust air duct (63) communicates with two second outlet openings (32a; 32b), each arranged in the middle partial surface (20a) and adjacent to the lower end of the two outer partial surfaces (20b; 20c),

   wherein the two second outlet openings (32a; 32b) each are arranged in the form of a slot in the central partial surface (20a) and adjacent to a lower end of a respective outer partial surface (20b; 20c), wherein

   the slots each run offset in parallel to the respective inlet opening (30a; 30b) and are such designed that a fluid flow (F2a; F2b) emerging from the second outlet opening (32a; 32b) has an angle of inclination which relative to the horizontal of the middle partial surface (20a) is about 15°.

Images