DE20205642U1 - Extractor device, in particular extractor hood - Google Patents

Description

E1141-GM/IP

EXTRACTOR DEVICE, ESPECIALLY EXTRACTOR HOOD

Description

The invention relates to a fume extraction device of the type defined in the preamble of the protection claim
1 specified type.

Such a fume extraction device is the subject of WO 01/81831 (PCT/EP01/04469), which, however, is disregarded within the meaning of Section 3 I 3 of the Utility Model Act.

From the publication DE 295 11 237 U1, a fume extraction device of the type mentioned above in the form of an extractor hood is known. In this case, the two filters are arranged directly adjacent to one another, whereby the air flow that passes through one filter is directly influenced by the other filter and cannot be optimized in terms of filtering effect. The fan is attached to the extractor hood as an additional part, away from both filters. Finally, the known extractor hood is designed as an attachment for a portable cooking center. The filters are easy to clean. A cleaning option for the fan is not mentioned in this publication.

From the publication DE 28 15 771 A1, an air curtain system on frying systems and the like is known in which the fan is also connected downstream of the existing filters, so that in this air curtain system too, the air flow that passes through one filter is influenced by the other filters. Furthermore, the air curtain system is designed in such a way that it directs an air curtain at the front of the frying system or the like upwards to the extractor hood, with the air for the air curtain being supplied via a duct that leads behind the frying system or the like from the extractor hood downwards to the fan.

Similar air curtain systems are also known from the publications DE 24 02 615 A1 and US 3,260,189.

The object of the invention is to improve the filter effect of a fume extraction device of the type mentioned above. In particular, the cleaning options should be improved overall. Furthermore, at a workplace where

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is equipped with such a fume extraction device, the air flow and thus the fume extraction performance can be improved.

This object is achieved according to the invention by a fume extraction device having the features specified in claim 1.

In the fume extraction device according to the invention, the fan is arranged between the two filters. Since the filters have different pressure losses, the air flow for the two filters upstream and downstream of the fan can be optimally adjusted by the inventive arrangement of the fan. Advantageous embodiments of the invention form the subject matter of the subclaims. If, in an embodiment of the fume extraction device according to the invention, the fan is arranged in a room with an air flow inlet and an air flow outlet, the first filter being arranged at the air flow inlet and the second filter at the air flow outlet, the grease or first filter is located upstream and the odor or second filter is located downstream of the fan. Air to be cleaned is therefore sucked through the grease filter by means of the fan and pushed through the odor filter. Since the fan is arranged between at least two filters, it is protected from contamination. The fan is not affected by air laden with grease and the air emitted at the outlet of the extractor is not only grease-free but also odor-free.

If, in a further embodiment of the air extraction device according to the invention, each filter is designed as a removable cassette, the filters can be easily cleaned, for example the grease filter in a dishwasher. If, in a further embodiment of the air extraction device according to the invention, the fan is designed as a removable unit, for example also as a type of pull-out cassette, the fan can also be easily cleaned. If a watertight encapsulated drive motor is used, the fan can also be cleaned in the dishwasher.

If, in a further embodiment of the fume extraction device according to the invention, an air outlet chamber is arranged downstream of the space which is delimited on the inlet side and outlet side by the first and second filters, respectively, and in which the fan is accommodated, the discharge of air by the fume extraction device can be controlled independently of the filters and the fan.

If, in a further embodiment of the air extraction device according to the invention, the air outlet chamber has a recirculation outlet and an exhaust air outlet for the air flow and is provided with a device for selectively switching to recirculation or exhaust air,

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The fume extraction device according to the invention can be used either as a recirculation or exhaust air device. If, in a further embodiment of the fume extraction device according to the invention, the first filter is a cyclone filter, grease can be separated particularly effectively. Such a cyclone filter is manufactured, for example, by Rentschier Reven Lüftungssysteme GmbH, D-74372 Sersheim. With such a filter, 99.5% of the grease carried by the air flow can be separated.

If, in a further embodiment of the extractor device according to the invention, the second filter is a zeolite filter, the second filter can be easily regenerated, making it particularly easy to maintain and environmentally friendly. Regeneration takes place by applying heat to the zeolite filter. For this purpose, the zeolite filter can be placed in a warming cabinet or in a self-cleaning combi steamer, self-cleaning hot air cooker, oven with catalyst or the like already present in a kitchen, in which temperatures of around 250° Celsius can be achieved. Organic substances that have been adsorbed by the filter material during operation are desorbed again by the heat supply.

If, in a further embodiment of the extractor hood according to the invention, this is a wall-mounted extractor hood, the second filter is arranged horizontally. This results in a particularly advantageous effect of the second filter.

The same applies in a further embodiment of the fume extraction device according to the invention if the first filter is arranged inclined against the horizontal.

If, in a further embodiment of the fume extraction device according to the invention, it is designed for connection to a workstation located above or next to it, it is used as described in the aforementioned WO 01/81831, but with the additional advantages described here, in particular due to the design of the filters and the fan as pull-out cassettes.

If, in a further embodiment of the extractor device according to the invention, this is an extractor hood designed to be installed at a workplace, an existing workplace such as a stove can be easily retrofitted with such an extractor hood.

If, in a further embodiment of the extractor device according to the invention, the fan is arranged in the space of the extractor hood above the first filter,

This results in good suction power of the extractor hood despite the low installation height of the extractor hood.

If, in a further embodiment of the extractor device according to the invention, the space of the extractor hood is connected to an air duct which directs air downwards behind a workstation and opens into an air duct at the workstation which at least partially encloses the workstation and directs an air curtain upwards to the extractor hood, which encloses a space between the workstation and the extractor hood, the workstation, for example a stove, a cooking area or the like, can be shielded by the air curtain in such a way that all fumes reach the extractor hood, but at the same time an operator or a rear wall in the area between the workstation and the extractor hood are safely shielded.

If, in a further embodiment of the air extraction device according to the invention, the second filter is arranged in the air duct, the height of the extractor hood can be further reduced and at the same time the filtering effect of the second filter can be improved.

If, in a further embodiment of the fume extraction device according to the invention, the fan is connected directly to the air duct, the conveying capacity of the fan can be utilized to the maximum.

If, in a further embodiment of the extractor device according to the invention, at least one overpressure flap is assigned to the space of the extractor hood or the air duct, an air jam within the extractor device can be reliably avoided.

If, in a further embodiment of the extractor device according to the invention, the air duct encloses the workplace on all sides, it is ensured that the air curtain also safely encloses the space between the workplace and the extractor hood on all sides.

If, in a further embodiment of the extractor device according to the invention, the air duct encloses the workstation on three sides, an air curtain can still be created that essentially encloses the space between the workstation and the extractor hood on all sides. In this embodiment of the invention, the operating side of the workstation is expediently kept free of an air duct in order not to hinder handling at the workstation, for example handling pots and pans on a stove.

If, in a further embodiment of the extractor device according to the invention, the air duct with the air duct forms a support structure for the extractor hood, which can thus be set up at a workplace, an already existing workplace such as a stove can be retrofitted in a particularly simple manner by simply placing the support structure on the workplace in such a way that the air duct attached to the bottom of the air duct encloses the workplace, except from the operating side.

If, in a further embodiment of the fume extraction device according to the invention, the air flow inlet of the room in which the fan is arranged is a fume extraction opening of a workplace that is adjacent to the workplace, this fume extraction opening is provided with the grease filter, which is thus also directly adjacent to the workplace. In other words, fumes laden with grease droplets can no longer enter the room that leads to the fan. This means that this entire room can no longer be contaminated by grease, which makes cleaning the device much easier.

Embodiments of the invention are described in more detail below with reference to the accompanying drawings.

Fig. 1 shows an extraction device designed as a wall-mounted extractor hood according to the invention,

Fig. 2 a fume extraction device according to the invention designed for connection to a workstation located above or next to it,

Fig. 3 a stove with an extractor hood arranged above it in a sectional side view (Fig. 3a) and in plan view (Fig. 3b),

Fig. 4 shows an extractor hood designed for installation at a workplace in a sectional side view (Fig. 4a), a front view (Fig. 4b) and a plan view (Fig. 4c), and

Fig. 5 shows a variant of the fume extraction device according to Fig. 2, in which an air flow inlet adjacent to the workstation is equipped with a grease filter.

Fig. 1 shows a fume extraction device designed as a fume extractor hood and
is designated overall by 10. In a room 12 with an inclined front wall 14, a rear wall 16, a side wall 18 and a further side wall not visible in Fig. 1, a fan 20 is arranged between an air flow inlet 22 and an air flow

ventilation outlet 24. The speed of the fan 20 can be adjustable in all embodiments described here. A first filter for collecting grease (hereinafter referred to as grease filter) 26 is arranged on the air flow inlet 22. A second filter for adsorbing fragrances, aerosols and the like (hereinafter referred to as odor filter) 28 is arranged on the air flow outlet 24. Next to the grease filter 26 there is a light source 30 for illuminating a work station which is located below the extractor hood 10 and which is, for example, a cooking area, a grill or the like. Each filter 26, 28 is designed as a removable or pull-out cassette. The cassette of the odor filter 28 consists of a frame which is provided with a grid on the inlet side and outlet side. Zeolites in the form of shaped bodies (pearl granules, extrudates, tablets and the like) are arranged between the two grids. The fan 20 is also designed as a removable or pull-out unit in the manner of a cassette. In Fig. 1, the filters 26, 28 and the fan 20 each have wall extensions F for this purpose, which are slidably accommodated in U-profile rails U. The side wall, not visible in Fig. 1, can be removed or folded away so that the filters and the fan can be pulled out of the space 12 and pushed back into the space. A grease channel or a removable grease collecting container 29 is arranged under the grease filter 26.

An air outlet chamber 32 is connected downstream of the room 12. The air outlet chamber 32 has a recirculation outlet 34 and an exhaust air outlet 36. The air outlet chamber 32 contains a flap 38 as a device for optionally switching to recirculation or exhaust air. In a position of the flap 38 shown in solid lines, the air outlet chamber 32 is switched to exhaust air. In this case, the exhaust air outlet 36 is expediently connected to an exhaust air chimney or the like (not shown). In the dashed position of the flap 38, the air outlet chamber 32 is switched to recirculation. In this case, the air flow returns to the room via the recirculation outlet 34, from which the extractor hood 10 extracts air in order to pass a flow of air to be cleaned through the filters 26 and 28.

In the extractor hood 10 according to Fig. 1, the odor filter 28 is arranged horizontally and the grease filter is inclined against the horizontal, as shown in Fig. 1.

Fig. 2 shows a fume extraction device which is designed for connection to a workstation 40 located above or next to it. An air flow 42 generated by the fan 20 is indicated by arrows in Fig. 2. In this embodiment, too, the two filters 26, 28 delimit a space 12 on the inlet side and the outlet side, in which the fan 20 is arranged. Here, too, the filters 26, 28 and the fan 20 are connected to wall

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continue F are slidably mounted in U-profile rails U so that they can be easily pulled out for cleaning and then pushed back in again. The side wall facing the viewer is expediently provided with two doors (not shown) below the work station 40 which are closed during operation but can be opened when the filters 26, 28 and the fan 20 are to be removed for cleaning. In Fig. 2, the room with the filters 26, 28 and the fan 20 could also be arranged to the right of the work station 40 instead of under the work station 40 (not shown). In Fig. 2, the room 12 is provided with an additional exhaust air opening 44 through which part of the cleaned air flow 42 can be released in order to maximize the vapor entrainment in the area of the work station 40. A grease collecting tray 46 is arranged beneath the grease filter 26.

3a and 3b show a work station 40, here a stove, in a sectional side view and a plan view, respectively, with an extractor hood 10 arranged above the stove. As in the embodiment according to Fig. 1, the fan 20 is arranged in the space 12 of the extractor hood 10 above the first filter 26. As shown in Fig. 3a, the space 12 of the extractor hood 10 is connected to an air duct 48 which directs the air flow 42 downwards behind the work station 40 and leads below the work station 40 into a space 49 which opens into an air duct 50 which encloses the work station 40 on all sides and directs an air curtain 54 upwards to the extractor hood 10. The air curtain 54 completely encloses a space 52 between the workstation 40 and the extractor hood 10 so that fumes or vapors 56 cannot escape into the environment. The air curtain 54 thus shields the space 52 between the workstation 40 and the extractor hood 10 towards the front towards an operator and shields a front wall of the air duct 48 at the back of the space 52 between the workstation 40 and the extractor hood 10 and thus protects this front wall from contamination. The air curtain 54 thus encloses the space 52 like a shower curtain. It is also pulled inwards like a shower curtain and thus stabilized around the space 52. This is caused by the Bernoulli effect in the lower part of the room 52. Here the air flows faster than outside the room 52 due to the blow jet emerging from the air duct 50 - a suction is created which bulges the air curtain inwards and stabilizes it like a shower curtain. The second filter 28 is arranged in the air duct 48. It could also be arranged in the room 49 instead. The fan 20 is directly connected to the air duct 48. An overpressure flap 60 or alternatively an overpressure flap 62 is assigned to the room 12 of the extractor hood 10 or the air duct 48. In the event of overpressure, the overpressure flap 60 can open upwards or the overpressure flap 62 can open downwards, which is indicated in each case by an arrow.

Fig. 4 shows a further embodiment of the fume extraction device according to the invention, namely in Fig. 4a in a sectional side view, in Fig. 4b in a front view and in Fig. 4c in a plan view. In this embodiment, the fume extractor hood 10 is designed to be set up at a workstation 40. An air duct 51, which is U-shaped in plan view, as can be seen in Fig. 4c, forms a support structure for the fume extractor hood 10 with the air duct 48. This support structure can be set up on any existing workstation or stove 40 as shown in Fig. 4. The support structure does not have to be adjacent to a wall of a room or the like, as shown in Fig. 4, because the support structure consisting of the air duct 48 and the air duct 51 with the fume extractor hood 10 attached to it has its own rear wall and can of course be set up freely on the workstation 40. As in the embodiment according to Fig. 3, an overpressure flap 60 is provided at the top and an overpressure flap 62 at the bottom. In order to be able to suck sufficient air through the grease filter 26, which is preferably designed as a cyclone filter, the fan 20 must have a high suction power. This means that a large amount of air is guided downwards through the air duct 48 at high speed. The entire amount of air is guided through the second filter 28 in order to be freed from odors and the like. The air flow 42, which transports the aforementioned amount of air at high speed, would cause an air jam at the front of the grease filter 26. To prevent this and to additionally ensure that the air flow generated by the fan 20 takes fresh air with it, the overpressure flap 60 is opened during operation. Furthermore, so that not all of the air flow is present at the front of the grease filter 26, the overpressure flap 62 is also opened during operation to discharge part of the air flow 42.

If the conditions at a workplace allow it, the air duct 51 can also be closed on the operator side so that it has the shape shown in Fig. 3b and creates an air curtain on all sides from the outset. However, an essentially all-round air curtain is also formed with the design of the air duct 51 as shown in Fig. 4c. The Bemoulli effect described above with reference to Fig. 3 helps considerably in this regard.

The first filter 26 can consist of several filters arranged next to one another. Two such filters can be seen in Fig. 4b.

The term "cyclone filter" used above refers, for example, to a REVEN X-cyclone filter, which is manufactured by Rentschier Reven Lüftungssysteme GmbH, mentioned above. Further details can be found in the Reven X-cyclone documentation. Such a cyclone filter contains X-shaped profiles as basic elements in the cross-section. This type of design - filter, fan, filter - is only possible due to its high degree of separation.

In the variant of the fume extraction device shown in Fig. 5, the air flow inlet 22' of the room 12' in which the fan 20 is arranged is a fume extraction opening of a work station 40 which is adjacent to the work station 40. Thus, the grease filter 26' is also directly adjacent to the work station, so that there is no longer a room or channel that could be contaminated by grease. The air flow outlet 28 of the room 12' in which the fan 20 is arranged is connected to a blow opening 23 of the work station 40 which is opposite the fume extraction opening of the work station 40. A grease collecting tray 46' is in turn arranged directly below the grease filter 26', as shown in Fig. 5 at the top right.

Claims (24)

1. Extractor device, in particular extractor hood, with at least one first filter for collecting grease, with at least one second filter for adsorbing fragrances, aerosols and the like and with a fan for generating an air flow passing through the filters, characterized in that the fan ( 20 ) is arranged between the two filters ( 26 , 28 ). 2. Vapor extraction device according to claim 1, characterized in that the fan ( 20 ) is arranged in a room ( 12 ) with an air flow inlet ( 22 ) and an air flow outlet ( 24 ), wherein the first filter ( 26 ) is arranged at the air flow inlet ( 22 ) and the second filter ( 28 ) is arranged at the air flow outlet ( 24 ). 3. Vapor extraction device according to claim 1 or 2, characterized in that each filter ( 26 , 28 ) is designed as a removable cassette. 4. Vapor extraction device according to one of claims 1 to 3, characterized in that the fan ( 20 ) is designed as a removable unit. 5. Vapor extraction device according to one of claims 1 to 4, characterized by an air outlet chamber ( 32 ) downstream of the space ( 12 ). 6. Vapor extraction device according to claim 5, characterized in that the air outlet chamber ( 32 ) has a recirculating air outlet ( 34 ) and an exhaust air outlet ( 36 ) for the air flow ( 42 ) and is provided with a device ( 38 ) for selectively switching to recirculating air or exhaust air. 7. Vapor extraction device according to one of claims 1 to 6, characterized in that the first filter ( 26 ) is a cyclone filter. 8. Vapor extraction device according to one of claims 1 to 7, characterized in that the second filter ( 28 ) is a zeolite filter. 9. Fume extraction device according to one of claims 1 to 8, characterized in that it is designed for connection to a work station ( 40 ) located above or next to it. 10. Vapor extraction device according to one of claims 1 to 9, characterized in that the first filter ( 26 ) is arranged inclined to the horizontal and is associated with a grease channel ( 29 ) or grease collecting tray ( 46 ) or a removable grease collecting container. 11. Vapor extraction device according to one of claims 1 to 10, characterized in that the second filter ( 28 ) is arranged horizontally. 12. Extractor device according to one of claims 1 to 11, characterized in that it is an extractor hood ( 10 ) designed for wall mounting. 13. Fume extraction device according to one of claims 1 to 11, characterized in that it is a fume extraction hood ( 10 ) designed to be installed at a workplace. 14. Extractor device according to claim 12 or 13, characterized in that the fan ( 20 ) is arranged in the space ( 12 ) of the extractor hood ( 10 ) above the first filter ( 26 ). 15. Extractor device according to one of claims 12 to 14, characterized in that the space ( 12 ) of the extractor hood ( 10 ) is connected to an air duct ( 48 ) which directs air downwards behind a work station ( 40 ) and opens at the work station ( 40 ) into an air guide duct ( 50 , 51 ) which at least partially encloses the work station ( 40 ) and directs an air curtain ( 54 ) upwards to the extractor hood ( 10 ), which encloses a space ( 52 ) between the work station ( 40 ) and the extractor hood ( 10 ). 16. Vapor extraction device according to claim 15, characterized in that the second filter ( 28 ) is arranged in the air duct ( 48 ) or in an adjoining space ( 49 ). 17. Vapor extraction device according to claim 15 or 16, characterized in that the fan ( 20 ) is directly connected to the air duct ( 48 ). 18. Vapor extraction device according to claim 15, characterized in that the fan ( 20 ) and the second filter ( 28 ) are arranged in a space ( 49 ) adjoining the air duct ( 48 ). 19. Extractor device according to one of claims 15 to 18, characterized by at least one overpressure flap ( 60 , 62 ) which is assigned to the space ( 12 ) of the extractor hood ( 10 ) or the air duct ( 48 ). 20. Fume extraction device according to one of claims 15 to 19, characterized in that the air duct ( 50 ) encloses the workstation ( 40 ) on all sides. 21. Fume extraction device according to one of claims 15 to 19, characterized in that the air duct ( 51 ) encloses the workstation ( 40 ) on three sides. 22. Extractor device according to claim 21, characterized in that the air guide channel ( 51 ) with the air channel ( 48 ) forms a supporting structure for the extractor hood ( 10 ), which can thus be set up at a workplace. 23. Fume extraction device according to claim 2 and in particular according to one of claims 3 to 12, characterized in that the air flow inlet ( 22 ') of the room ( 12 ') in which the fan ( 20 ) is arranged is a fume extraction opening of a work station ( 40 ) which is adjacent to the work station ( 40 ). 24. Fume extraction device according to claim 23, characterized in that the air flow outlet ( 28 ) of the room ( 12 ') in which the fan ( 20 ) is arranged is connected to a blow opening ( 23 ) of the work station ( 40 ) which is opposite the fume extraction opening of the work station ( 40 ).