DE102020213310B4 - Fan device for conveying air - Google Patents

Abstract

Built-in fan (19) for installation in a kitchen base cabinet (5) for an extractor device (3) for extracting cooking fumes, comprising
1.1. a duct coupling for connecting to a flow duct (10, 10c) of the extractor device (3) for extracting cooking fumes,
1.2. a fan wheel (22) for sucking air through the duct coupling,
1.3. at least one fastening means (31) for fastening the built-in fan (19) to the kitchen base unit (5), and
1.4. at least a filter holder for reversibly receiving a filter (62) for cleaning the air,
1.5. wherein a connecting surface (40) of the at least one filter holder, through which the filter (62) is supplied with the air to be filtered, surrounds a fan axis (24) of the fan wheel (22) over an angular range of at least 180°, and
1.6. wherein a minimum fan wheel distance (a _R ) between the connecting surface (40) and the fan wheel (22) is a maximum of 40% of the diameter (D) of the fan wheel (22).

Description

The invention relates to a built-in fan for installation in a kitchen base cabinet for an extractor hood for extracting cooking fumes. The invention also relates to a cabinet system with such a built-in fan and a cooktop system with an extractor hood and such a built-in fan.

From the WO 2018/ 036 800 A1 A fan device for an extractor hood is known in which a fan wheel is at least partially surrounded by a fan housing. The fan device is in air-conducting connection with a vacuum duct for sucking in the air and a positive pressure duct for blowing the air out. A recirculation module with a flow function element designed as a recirculation filter is connected to a first section of the positive pressure duct that is connected to the fan device. The disadvantages are that the air flow between the fan device and the recirculation module entails flow losses, that replacing the recirculation filter is complex to handle, and that the fan device requires a lot of installation space.

From the EP 3 163 175 B1 A cooker hood with a fan device is known, comprising a fan unit with connection means for connecting two air filters. The cooker hood includes a particle filter for pre-cleaning the drawn-in air stream. A disadvantage is that such a fan device is space-intensive and complex to manufacture.

The DE 10 2015 213 470 A1 discloses a fan module for a device for extracting cooking fumes. The installation of such a fan module involves considerable effort, and its installation on a kitchen cabinet requires considerable space.

From the US 5 000 160 A A cooktop system with multiple cooktops and a device for extracting cooking fumes downwards is known. The device for extracting cooking fumes comprises a fan unit with a fastening means for attaching the fan unit to a building floor. A disadvantage is that the fan unit and its arrangement on the building floor require a lot of space.

Devices for extracting cooking fumes are also known from DE 10 2008 033 792 A1 and the US 4,962,694 A.

It is an object of the invention to provide an improved built-in fan for installation in a kitchen base cabinet for a device for extracting cooking fumes, which is particularly easy to install and space-saving and robust in operation.

This object is achieved by a built-in fan having the features of claim 1. According to the invention, it was recognized that a built-in fan for installation in a kitchen base cabinet for a device for extracting cooking fumes has a duct coupling for connecting to a flow duct of the device for extracting cooking fumes, at least one fastening means for attaching the built-in fan to the kitchen base cabinet, and at least one filter holder for reversibly receiving a filter for cleaning the air. This allows the built-in fan to be arranged particularly flexibly, in particular independently of the arrangement of an inlet opening of the extractor device and/or a cooktop of a cooktop system. The duct coupling also ensures an easily installed and robust connection to the flow duct, in particular a vacuum duct, during operation. Vibrations and noise emissions from the built-in fan are dampened by the kitchen base cabinet. Attaching the built-in fan to a kitchen base cabinet also enables a particularly space-saving arrangement of the built-in fan, in particular the device for extracting cooking fumes. The built-in fan can be arranged at least partially or completely behind a rear wall and/or in a plinth space of the kitchen base cabinet, whereby the available installation space within the kitchen base cabinet can be largely retained as storage space. The fact that at least one filter holder is an integral part of the built-in fan reduces the required number of assembly steps. In addition, an overall particularly space-saving arrangement is possible. Furthermore, the flow path between the fan wheel and the filter holder is fixed, so that particularly efficient flow guidance can be achieved. Adverse interventions in the flow path between the fan wheel and the filter holder during installation are reliably prevented. The built-in fan is particularly flexible and space-saving in use, as well as being particularly robust and efficient in operation.

The channel coupling can be designed for reversibly detachable or permanent, in particular non-destructively detachable, for example, materially bonded, connection to a flow channel. The channel coupling can have a plug connection and/or a bayonet connection. In particular, the channel coupling can have a sealing element, in particular made of a rubber-elastic material, for an airtight connection to the flow channel. The channel coupling can have a frontal and/or an internal and/or an external have a sufficient coupling surface for, in particular, a tight connection to the flow channel.

The duct coupling is located on the intake side of the built-in fan. A duct coupling can be located on the exhaust side for connecting to a pressure duct. The intake-side duct coupling is also referred to as the intake flange.

The built-in fan can have an intake opening and/or an exhaust opening through which the air flows into and/or out of the built-in fan. The intake opening and/or the exhaust opening can be formed by the respective duct coupling. The intake opening and the exhaust opening of the built-in fan can be oriented parallel and/or perpendicular and/or obliquely to each other, in particular within an angular range of 20° to 70°.

The fan wheel can be designed as an axial fan wheel, a cross-flow fan wheel, or preferably as a radial fan wheel. The fan wheel blades of the radial fan wheel are preferably curved backwards.

The built-in fan may include a fan stator. The fan stator is preferably arranged downstream of the fan impeller in the direction of flow, in particular directly downstream. Such a stator increases the flow efficiency of the built-in fan by redirecting a circumferential component of the flow around the fan axis into a radial component. This allows a higher pressure difference to be achieved with the same ventilation performance.

The at least one fastening means can be designed to fasten the built-in fan to a wall, in particular to a rear wall and/or a floor wall and/or a side wall, of the kitchen base cabinet. The fastening means preferably has a contact surface for contacting the wall of the kitchen base cabinet. The contact surface is preferably flat. The flat contact surface can be located in a wall connection plane in which the built-in fan rests against the wall.

The mounting device can have a vibration-damping support on which the contact surface is formed. This reduces the vibrations transmitted from the built-in fan to the kitchen base cabinet.

The at least one filter receptacle is designed to reversibly accommodate a filter, in particular a grease filter and/or an odor filter. The filter receptacle can have a connection surface through which air can flow, at least partially, in particular completely, and through which the filter is exposed to the air to be filtered. The connection surface can be circumferentially delimited by a connection frame. The connection frame is preferably designed to make airtight contact with the filter. The connection surface can be formed, at least in sections, by an intervention guard, in particular with a grid structure and/or a perforated structure.

The flow channel of the device for extracting cooking vapors is preferably designed as a flat channel. The flow channel can have at least two, in particular at least three, and/or a maximum of five, in particular a maximum of four, channel sections. The flow channel preferably has a maximum of four, in particular a maximum of three, in particular a maximum of two, channel sections with a curvature for flow deflection.

The built-in fan is preferably designed as an assembly unit, in particular as a one-piece fan module. An assembly unit is defined as a single-piece component in the delivery state. The built-in fan is thus particularly easy to install, space-saving, and particularly efficient in terms of airflow between the fan wheel and the filter holder.

A ratio of a minimum flow cross-section of the duct coupling to a diameter of the fan wheel can be in a range from 0.4:1 to 0.9:1, in particular from 0.6:1 to 0.8:1.

The built-in fan can have a support structure to which the fan wheel and/or the at least one filter holder and/or the duct coupling and/or the at least one fastening means are attached. The support structure can be formed by a fan housing. Preferably, the fan wheel and/or the at least one filter holder are at least partially, in particular completely, accommodated in the fan housing. The support structure can be connected to the duct coupling and/or the at least one fastening means and/or the at least one filter holder in a form-fitting and/or force-fitting manner, in particular in a reversibly detachable manner, and/or in a materially bonded manner, in particular in a non-destructively detachable manner.

The built-in fan, in particular the duct coupling, can comprise a cabinet wall duct in the form of a flow duct piece for directing the air flow through a fan recess in the wall of the kitchen base cabinet. The cabinet wall duct can be integrally connected to the fan housing or detachably connected to it.

The fan recess in the cabinet wall, in particular the base wall, can be round, in particular circular, or semicircular or polygonal, in particular square.

According to one aspect of the invention, the built-in fan has an immersion height by which the built-in fan projects beyond the wall connection plane of the fastening means on a side opposite the fastening means, of a maximum of 140 mm, in particular a maximum of 120 mm, in particular a maximum of 100 mm, in particular a maximum of 80 mm, in particular a maximum of 60 mm, in particular a maximum of 40 mm, and/or at least 20 mm, in particular at least 40 mm, in particular at least 60 mm, in particular at least 80 mm, in particular at least 100 mm. In other words, the immersion height is the dimension over which the built-in fan extends from the wall connection plane into the fan recess in the wall. When the built-in fan is mounted on the rear wall or the base wall of the kitchen base cabinet from the inside, any installation space taken up by the built-in fan along the immersion height can be retained within the kitchen base cabinet as storage space.

The wall connection plane is preferably oriented perpendicular to the fan axis. The immersion height is measured perpendicular to the wall connection plane and preferably parallel to the fan axis.

The dimensions of the built-in fan transverse to the fan axis are preferably in a range from 100 mm to 400 mm, in particular from 200 mm to 350 mm, in particular from 250 mm to 320 mm.

According to a further aspect of the invention, the at least one fastening means is designed to fasten the built-in fan to a floor wall, in particular a base wall, of the kitchen base cabinet and/or to a floor. This advantageously ensures that the built-in fan can be integrated into the kitchen base cabinet in a particularly space-saving manner, and that noise emissions from the built-in fan can be largely absorbed by the kitchen base cabinet.

According to a further aspect of the invention, the at least one filter receptacle has a curved connection surface. The connection surface can be single- or double-curved. Preferably, the connection surface is curved in a circular arc at least in sections, in particular completely. The connection surface can be annular. Preferably, the connection surface encloses the fan axis in an angular range of 90° to 360°, in particular of 120° to 270°, in particular of 180° to 240°.

Preferably, an inflow surface of the filter is shaped, in particular curved, to correspond to the connection surface of the filter receptacle. The filter can be rigid or flexible. Preferably, the inflow surface of the filter is deformable between a flat shape and a curved shape, in particular reversibly, i.e., non-destructively.

According to a further aspect of the invention, the filter holder is designed for reversible removal of the filter from the built-in fan in a direction parallel and/or perpendicular to an air inflow direction through the duct coupling and/or to the fan axis and/or in a vertical upward direction. The filter holder can have a filter guide, in particular a linear guide, along which the filter can be removed from the filter holder.

The filter can be removed from the filter holder in a direction parallel and/or perpendicular to the wall connection plane. Preferably, the filter can be removed from the built-in fan, in particular from the at least one filter holder, through the fan recess in the wall of the kitchen base cabinet.

According to a further aspect of the invention, the filter holder has a reversibly closable removal opening for reversibly removing the filter. The built-in fan can have a filter cover for reversibly closing the removal opening. The filter cover can be designed as a flap, in particular attached to the filter holder in an articulated manner. The filter cover can be designed as a separate component, in particular as a component that can be completely removed from the built-in fan. Alternatively, the filter cover can be a component of the filter, in particular one that is permanently connected to the filter. The removal opening and/or the filter cover can be arranged on a baseboard of the kitchen base cabinet for easy removal of the filter via the base space.

According to a further aspect of the invention, the filter receptacle has a reversibly variable dimension with respect to at least one direction of extension. Preferably, the filter receptacle has a variable connection surface, in particular a variable flow cross-section. For this purpose, the filter receptacle can have a filter frame with a reversibly variable dimension. The filter receptacle, in particular the filter frame and/or At least one side wall can be designed to be telescopic, in particular by means of a rail system. In particular, a filter chamber for accommodating the filter can have a variable chamber volume.

According to one aspect of the invention, the built-in fan can have a filter drawer with at least one filter receptacle. The filter drawer can be designed to be displaceable relative to the fan wheel and/or the fan housing. For this purpose, the filter drawer can be connected to the fan wheel and/or the fan housing via a linear guide. The filter drawer preferably comprises at least one, in particular at least two, and/or a maximum of four of the filter receptacles. The filter drawer is preferably displaceable between an operating position and a removal position relative to the fan wheel and/or the fan housing. In the operating position, the at least one filter receptacle can be connected to the fan wheel in an air-conducting manner and sealed hermetically from the environment. In the removal position, the at least one filter can be removed from the at least one filter receptacle. An air duct between the fan wheel and the at least one filter receptacle is preferably open to the environment in the removal position.

The filter drawer can be fitted with a baseboard mount for attaching a baseboard and/or decorative strip. This allows the filter drawer to blend discreetly into the appearance of the kitchen base cabinet.

One aspect of the invention relates to a built-in fan, in particular in the form of a drawer fan, with a drawer for reversibly displaceable attachment to a kitchen cabinet and a fan impeller attached to the drawer for conveying air. The built-in fan is preferably further developed by at least one of the features described above in connection with the built-in fan. Preferably, the built-in fan comprises a fan motor for rotating the fan impeller. The fan motor can also be attached to the drawer. The built-in fan can have at least one filter holder for reversibly receiving a filter for cleaning the air, which filter is preferably attached to the drawer. This advantageously ensures that the fan impeller and the filter holder are particularly easily accessible for maintenance and cleaning purposes.

The drawer is preferably displaceable, in particular displaceable relative to the kitchen cabinet, between an operating position in which there is a flow-conducting connection between the built-in fan and the flow channel and a maintenance position in which the flow-conducting connection is interrupted and/or the fan wheel is accessible for cleaning purposes and/or the at least one filter holder is accessible for replacing the at least one filter.

The built-in fan can have a drawer seal attached to the drawer for airtight connection to a flow channel, in particular a vacuum channel. The drawer seal is preferably designed to ensure a detachable connection between the built-in fan and the flow channel, in particular for relocatability between the operating position and the maintenance position, and/or to connect the built-in fan to the flow channel in an airtight manner in the operating position.

According to a further aspect of the invention, the at least one fastening means for fastening the built-in fan to the kitchen base cabinet has a wall connection plane for contacting a wall of the kitchen base cabinet, wherein the at least one fastening means is designed such that the built-in fan extends at least partially onto a side of the wall connection plane opposite the at least one fastening means in order to protrude into a fan recess in the wall. This allows the built-in fan to be installed from an easily accessible interior of the kitchen base cabinet. The available installation space in the area of the wall and/or behind the wall can be used to accommodate the built-in fan. This allows the built-in fan to be arranged in the kitchen base cabinet in a particularly space-saving manner. The built-in fan is preferably further developed with at least one of the features described above in connection with the built-in fan.

The at least one fastening means is preferably designed such that the built-in fan can be inserted into the fan recess with at least partial, in particular complete, passage of the fan wheel through the fan recess.

Preferably, a distance between the wall connection plane and the fan wheel is in a range from 0 mm to 50 mm, in particular from 0 mm to 30 mm, in particular from 5 mm to 20 mm.

According to a further aspect of the invention, the fan wheel and/or the supporting structure, in particular the fan housing, are arranged at least partially, in particular completely, on a side of the wall connection plane opposite the at least one fastening means. As a result, the built-in fan installed on the wall penetrates into the fan recess, whereby the built-in fan can be installed in a particularly space-saving manner, especially in the kitchen base cabinet.

According to a further aspect of the invention, the intake opening and the exhaust opening of the built-in fan are arranged at least partially, in particular entirely, on opposite sides of the wall connection plane. Thus, the built-in fan is designed to direct the conveyed air through the wall, in particular the fan recess.

Another object of the invention is to provide an improved cabinet system.

This object is achieved by a cabinet system comprising at least one kitchen base cabinet, with at least one cabinet wall, and a base space, and at least one built-in fan and/or a fan device according to the above description. The at least one cabinet wall preferably has a fan recess. Preferably, the flow channel and/or the built-in fan and/or the fan device and/or the support structure penetrate the at least one cabinet wall, preferably a side wall and/or a rear wall and/or a bottom wall of the kitchen base cabinet. The fan recess is preferably arranged centrally on the bottom wall and/or on the rear wall side, in particular centrally and/or in a corner region.

The at least one built-in fan is preferably arranged at least partially, in particular completely, in the base space and/or behind the rear wall of the kitchen base unit.

According to one, particularly independent, aspect of the invention, a skirting board of the kitchen base cabinet has at least one filter receptacle for the reversible insertion of a filter and/or at least one filter. The skirting board preferably has at least one, in particular two, strip walls. A decorative layer can be attached or attachable to one of the strip walls. The filter receptacle and/or the filter could be arranged between the two strip walls, in particular connecting the two strip walls to one another. The two strip walls are preferably oriented parallel to one another with respect to their main extension plane and/or arranged at a distance from one another perpendicular to their main extension planes. The strip walls preferably overlap one another perpendicular to their main extension planes. The filter receptacle and/or the filter can be arranged at least partially, in particular completely, in the overlapping area. The strip walls preferably delimit a flow channel arranged therebetween. The air can be supplied to or discharged from this flow channel via a gap between the strip walls.

According to one aspect of the invention, the base space is a component of the flow channel. The base space can be sealed off from the environment in an airtight manner, particularly in the area between the kitchen base cabinet and the floor, particularly by means of a base space seal. A corresponding design of the base space leads to particularly efficient air filtration, particularly in conjunction with the above-described baseboard with a filter function.

The strip walls are preferably detachably connected to one another. In particular, the detachable connection can comprise a magnetic connection, a snap connection, and/or a hook-and-loop connection.

Another object of the invention is to improve a hob system.

This object is achieved by a cooktop system comprising at least one cooktop and an extractor device for extracting cooking vapors downwards, with at least one built-in fan and/or a fan device according to the above description. The cooktop system is preferably further developed by at least one of the features described above in connection with the built-in fan and/or the fan device and/or the cabinet system.

A fan device, comprising a fan unit with a fastening means for fastening the fan unit to a wall, can be designed such that the ratio of the fan impeller-to-wall distance, which is determined by a minimum distance between a wall connection plane of the fastening means and a fan impeller of the fan unit, to the radial extent of the fan impeller is a maximum of 0.5. This advantageously ensures that the fan device, in particular the fan unit, can be fastened to a wall in a particularly space-saving manner. By arranging the fan device with a correspondingly small fan impeller-to-wall distance, the fan device protrudes only slightly from the wall. Installation space can thus be saved. A vacuum duct connected to the fan unit can be laid particularly close to the wall, in particular in a connection area of the fan unit, which can further save installation space. Due to the compact arrangement of the fan device on the wall, a space adjacent to the wall, in particular a Space within a kitchen base cabinet, largely retained as storage space.

The wall can be a building wall and/or the wall of a kitchen base unit. The wall is preferably vertically oriented. The wall connection plane is preferably a plane oriented parallel to the wall, in which the fan unit rests against the wall, in particular in which the fastening means contacts the wall.

The fan unit can have at least one connection means for connecting a flow function element to the fan housing. A fan device whose fan unit has a fan housing and at least one connection means connected thereto for connecting a flow function element, wherein a flow function element in the form of an air filter and/or a silencer is connected to the connection means of the fan unit, can be operated particularly economically, is easy to handle, and can be designed to be particularly compact. Because the flow function element is arranged on the connection means connected to the fan housing, additional duct sections and the associated flow losses can be avoided. In particular, curved duct sections between the fan wheel and the flow function element, which generate high flow resistance, can be dispensed with.

The fan device may comprise a flow function element in the form of an air filter and/or a silencer that is connected to the at least one connection means in a flow-conducting manner.

The fan unit can have at least one liquid reservoir, which is attached to the fan housing or is a component of the fan housing. Because the fan unit preferably comprises the liquid reservoir attached to the fan housing or formed as a component of the fan housing, the fan device can be cleaned particularly easily. In particular, pre-cleaning of the extracted air stream can be dispensed with, since larger quantities of contaminants can be absorbed in the fan unit, in particular in the liquid reservoir. The liquid reservoir can be designed to absorb water and/or grease and/or oil.

The liquid reservoir can be connected to the fan housing in one piece, in particular in a single piece, and/or permanently. A one-piece component can comprise several components that are connected to one another, in particular detachably or permanently. The component is considered to be in one piece if these components are connected to one another in a non-detachable manner, in particular in a way that cannot be detached non-destructively and/or by a material bond. A reversibly closable reservoir opening for emptying the liquid reservoir can be arranged on the liquid reservoir. The reservoir opening can preferably be reversibly closed by means of a valve, in particular a screw valve, and/or a latch and/or a flap and/or a plug.

The fan device can be of modular design. For the modular design of the fan device, the fastening means can be designed for attachment to an exterior wall of a building and/or an interior wall of a building and/or a supporting structure of a cooktop system, in particular a housing wall. The fastening means can be designed for attaching the fan unit to a vertical and/or horizontal wall.

In an orthogonal projection onto a rotational plane of the fan impeller, the fan housing can have the shape of a polygon, in particular a hexagon or a quadrilateral, in particular a rectangle, in particular a square, or an ellipse segment, in particular a circle segment. The fan housing can have a shape that deviates from a spiral shape. Because the fan housing has a shape that deviates from a spiral shape, it can be mounted particularly compactly on the wall.

The opposing transverse dimensions of the fan housing may differ from each other on both sides of a central plane oriented perpendicular to the wall connection surface and passing through the axis of rotation by a maximum of 20%, in particular a maximum of 10%, in particular a maximum of 5%.

The ratio of the fan wheel-to-wall distance to the radial extent of the fan wheel is preferably a maximum of 0.5, in particular a maximum of 0.4, in particular a maximum of 0.3, in particular a maximum of 0.2, in particular a maximum of 0.1, in particular a maximum of 0.05. The fan device can thus be arranged particularly compactly on the wall.

The distance between the fan impeller and the wall can be a maximum of 75 mm, in particular a maximum of 60 mm, in particular a maximum of 40 mm, in particular a maximum of 20 mm, in particular a maximum of 10 mm. This enables a particularly space-saving arrangement of the fan unit on the wall.

A ratio of a fan axis-to-wall distance, which is determined as the minimum distance between the fan axis and the wall connection plane, to a fan axis-to-housing distance diametrically opposite the fan axis, which is determined between the fan axis and a radially outermost section of the fan housing, can be a maximum of 0.7, in particular a maximum of 0.5, in particular a maximum of 0.3, in particular a maximum of 0.2. Due to the fan axis-to-housing distance being larger than the fan axis-to-wall distance, one or more flow function elements can be arranged in or on the fan housing in an area opposite the wall connection plane with respect to the axis of rotation.

A ratio of the fan axis-wall distance to the fan axis-housing maximum distance, which is determined between the fan axis and the overall radially outermost housing section, can be a maximum of 0.7, in particular a maximum of 0.5, in particular a maximum of 0.3.

The wall connection plane can be oriented obliquely, in particular perpendicularly, to a rotational plane of the fan impeller. Preferably, the wall connection plane is oriented parallel to the rotational axis and/or perpendicular to an intake opening of the fan housing.

The fan wheel can feature backward-curved rotor blades, eliminating the need for a spiral-shaped fan housing. The fan unit can be mounted on the wall for particularly space-saving installation.

A ratio of an intake opening-to-wall distance, which is determined by a minimum radial distance between an intake opening of the fan unit, in particular of the fan housing, and the wall connection plane, to a radial extension of the fan wheel can be a maximum of 1.0, in particular a maximum of 0.8, in particular a maximum of 0.6, in particular a maximum of 0.4, in particular a maximum of 0.2. This advantageously ensures that a vacuum duct connected to the intake opening can be arranged along the wall in a particularly space-saving manner. The vacuum duct is preferably characterized in that it extends upstream of the fan unit, in particular between an inlet opening of a fume extraction device and the fan unit.

An orthogonal projection of the fan housing onto a rotational plane of the fan wheel can essentially have the shape of an ellipse segment, in particular a circular segment. This advantageously allows the fan device to be arranged on the wall in a particularly space-saving manner, while the conveyed air can flow particularly evenly and thus with high flow efficiency from the fan wheel. In particular, the air flowing from the fan wheel can be supplied in a particularly evenly distributed manner to a flow function element arranged downstream of the fan wheel.

A ratio of the fan axis-wall distance to a maximum radial extension of the fan housing parallel to the wall connection plane and transverse to the fan axis can be a maximum of 0.8, in particular a maximum of 0.6, in particular a maximum of 0.4, in particular a maximum of 0.2.

Fan units are preferably mounted in such a way that they, in particular their fan wheel and/or fan drive, are particularly easy to access for maintenance and repair work. By connecting the flow function element directly to the fan unit, the flow function element is also particularly easy to access. In particular, the number of access points required for maintenance and repair of the fan unit can be reduced. The fan wheel and/or fan drive as well as the flow function element can be reached via a single access point. The space required to access these components is reduced. The fan unit can be designed to be particularly compact. By omitting a duct section arranged between the fan unit and the flow function element, the fan unit can be designed to be particularly space-saving and compact. The range of applications of the fan unit is therefore significantly broadened.

The fan housing may comprise an overflow edge for draining liquids into the liquid reservoir, in particular from a bottom region of the fan housing and/or from the connection means. Preferably, the fan housing is configured to slope monotonically in the vertical direction between the bottom region and/or the connection means and the overflow edge.

The liquid reservoir is preferably designed as a collecting tray or a collecting trough. The liquid reservoir can be designed to hold at least 50 ml, in particular at least 100 ml, in particular at least 150 ml, in particular at least 250 ml, in particular at least 500 ml, of liquid.

The fan unit can have at least two, in particular at least three, fan wheels, which are at least partially surrounded by the one fan housing. The fan unit preferably comprises a single fan wheel.

The fan unit can be designed as a radial fan, a cross-flow fan, or an axial fan. The fan impeller is preferably designed as a radial fan impeller.

The fan device preferably comprises at least one fan drive. Each of the at least one fan wheel can be configured with its own fan drive. Several of the fan wheels can be rotationally driven by a single fan drive.

A rotational axis of the at least one fan drive can be arranged concentrically to the fan axis. Preferably, the at least one fan drive is at least partially surrounded by the fan housing. The fan device is thus particularly safe during operation. In particular, a user's manual intervention in the fan device is prevented. The at least one fan drive can also be arranged outside the fan housing. The fan drive can be connected to the at least one fan wheel via a gear, in particular a drive belt, in a torque-transmitting manner.

The air filter can be an odor filter, in particular an activated carbon filter and/or a plasma filter and/or a UV filter, and/or a particle filter and/or a moisture filter. The activated carbon filter can comprise a folded, in particular pleated, filter layer. The edges of the folds preferably extend substantially parallel to the fan axis. The filter layer of the activated carbon filter can have a plurality of windings and/or layers, which are in particular oriented parallel to the fan axis, in particular arranged concentrically thereto. Preferably, the fan device is designed to be operated, in particular selectively, in an exhaust air mode or in a recirculation air mode. The air filter ensures the cleaning of the air in the recirculation air mode. The silencer is designed to reduce air conveying noise. The flow function element can be a combination element comprising an air filter and a silencer.

Preferably, the at least one connecting means is designed as a filter seat and/or a silencer seat. The connecting means can be configured such that an air filter and/or a silencer and/or a combination element comprising an air filter and a silencer can be connected thereto.

The connecting means and/or the flow function element can be arranged at least partially, in particular at least 10 to 50%, in particular completely, in the fan housing.

Preferably, the at least one connection means is designed for the mechanical and airtight connection of the flow function element. The connection means can have a sealing means for the airtight connection to the flow function element. Preferably, the flow function element comprises a counter-connection means for connection to the connection means. The counter-connection means can have a counter-sealing means for the airtight connection to the connection means.

Preferably, the flow function element can be attached to the connecting means in a force-fitting and/or form-fitting manner. In particular, the flow function element can be attached to the connecting means by means of a clamp connection and/or an anti-slip interference fit, which is achieved in particular by a flexible sealing means.

Preferably, the flow function element comprises an identification means, in particular a visual identification means, in particular a barcode and/or a matrix code and/or a color code, and/or a non-visual identification means, in particular a magnetic strip and/or a computer chip, and/or a radio-transmitting identification means, in particular an RFID chip.

The fan housing comprises an intake opening for sucking in air. A vacuum duct can preferably be connected to the intake opening, in particular by means of an intake flange. The intake opening is arranged in a vacuum section of the fan unit, in particular the fan housing. The fan housing has an exhaust opening for expelling the conveyed air. The at least one fan wheel is arranged between the intake opening and the exhaust opening in the flow direction. The fan housing can have one or more intake openings and/or exhaust openings.

The fan housing can comprise a lower housing part and an upper housing part. The lower housing part can be reversibly connected to the upper housing part. The fan housing preferably comprises a fastening means for mounting the fan device to a preferably flat surface.

The fan housing can be designed for outdoor installation and/or for installation in a living space. In particular, the fan device can be used as an external wall fan and/or as a roof fan and/or be designed as an interior fan, in particular as a base fan for installation in the base area of a kitchen cabinet.

The fan device is designed, in particular, as a fan module. The fan module can be connected to a separate appliance, such as a combination hob, via one or more air supply means, for example, one or more pipe or duct elements.

The fan housing is preferably designed to be driving rain-tight and/or splash-proof. An exhaust opening of the fan housing can have a reversibly closable housing flap. The housing flap is preferably pre-tensioned into a closed position, in particular by means of a spring element and/or due to gravity. When the fan unit is activated, the housing flap can be displaced from the closed position to an open position due to the conveyed air flow. The fan housing is preferably designed for connection to a wall box, in particular to a wall duct connection. The fan device can therefore be used particularly flexibly. The fan device can have feet for attaching the fan unit to the floor and/or a roof.

An extension of the fan unit transverse to the fan axis is preferably a maximum of 600 mm, in particular a maximum of 500 mm, in particular a maximum of 300 mm. An extension of the fan unit along the fan axis is preferably a maximum of 200 mm, in particular a maximum of 150 mm, in particular a maximum of 100 mm, in particular a maximum of 85 mm, in particular a maximum of 60 mm. A diameter of the at least one fan wheel is preferably a maximum of 600 mm, in particular a maximum of 500 mm, in particular a maximum of 300 mm, in particular a maximum of 200 mm, in particular a maximum of 100 mm and/or at least 50 mm, in particular at least 80 mm, in particular at least 100 mm, in particular at least 120 mm, in particular at least 140 mm. A volume flow that can be conveyed by means of the fan device is preferably at least 300 m ³ /h, in particular at least 500 m ³ /h, in particular at least 1000 m ³ /h, in particular at least 1500 m ³ /h, in particular at least 2000 m ³ /h.

An intake opening of the fan unit can be arranged on a top side of the fan housing. The fan unit is preferably designed to extract cooking fumes downwards. The intake opening can also be arranged on the underside of the fan housing. The liquid reservoir is preferably arranged on the underside of the fan housing. Fan units designed to extract cooking fumes downwards are, in contrast to fan units for extractor hoods, exposed to a considerably greater degree of exposure to liquids. The liquid reservoir is preferably designed to protect the fan device, in particular the fan unit, from overflow liquids. For this purpose, the liquid reservoir can be arranged below a fan motor of the fan unit and/or below a fan wheel connection between the fan wheel and the fan motor.

The fluid reservoir can be reversibly removable from the fan housing. The reversibly detachable connection between the fluid reservoir and the fan housing allows the fluid reservoir to be removed from the fan unit, emptied outside the fan unit, and/or cleaned, for example, in a dishwasher. The fluid reservoir is preferably dishwasher-safe.

The fan unit can have at least two, in particular at least three, liquid reservoirs. The plurality of liquid reservoirs can be designed to be particularly compact. Liquid reservoirs of this type can be easily removed from the fan housing, even in very limited space, in particular from an extractor fan and/or a kitchen base cabinet.

The liquid reservoir can be removed from the fan housing in a vertical direction downwards and/or sideways, in particular in a horizontal direction. Preferably, the liquid reservoir can be removed from the fan housing without tilting about a horizontal axis. Spillage of the liquids contained therein can thus be prevented. For example, the liquid reservoir can be reversibly connected to the fan housing in a form-fitting manner, in particular by means of a latch and/or a snap-in connection and/or a bayonet lock. The liquid reservoir can also be screwed to the fan housing. The liquid reservoir can also be connected to the fan housing via a linear guide. Preferably, the liquid reservoir can be inserted into the linear guide for connection to the fan housing. The linear guide is preferably oriented horizontally.

The fluid reservoir can be hinged to the fan housing. Preferably, the connection of the fluid reservoir to the fan housing is designed such that the fluid reservoir can be folded away from the fan housing for removal.

The fan device, in particular the fan unit, can comprise a cover element for reversibly blocking a discharge opening for the at least one flow function element and/or the at least one fan wheel. The cover element is preferably formed integrally with the fluid reservoir. The cover element is preferably reversibly connectable to the fan housing in accordance with the connection options explained above in connection with the fluid reservoir.

The cover element and/or the liquid reservoir can be formed integrally, in particular integrally, with the upper housing part or the lower housing part. The fan device, in particular the fan unit, can thus be manufactured particularly compactly and economically. The liquid reservoir and/or the cover element can be formed separately from the upper housing part and/or the lower housing part. Preferably, the upper housing part and/or the lower housing part are designed to conduct liquids into the liquid reservoir at an angle, in particular with a monotonous downward slope in the vertical direction.

The upper housing part and/or the lower housing part can comprise a sound insulation means, in particular a sound insulation mat, and/or a vibration damper for damping vibrations, in particular between two components.

The connecting means can have a connecting frame that encloses a connecting surface through which the conveyed air flows. The fan housing is preferably connected to the flow function element in an airtight manner via the connecting frame. The sealing element is preferably arranged on the connecting frame. Preferably, all of the air conveyed by the fan device flows through the connecting frame of the at least one connecting means.

The connecting frames of several of the connecting means can be connected in parallel or in series with respect to the air flow, in particular exclusively. The connecting surface is delimited by the connecting frame. The connecting surface can be flat, in particular rectangular.

The connecting frame can be formed by a circumferential web or a circumferential groove with respect to the connecting surface. Preferably, the connecting means, in particular the connecting frame, is integrally connected to the fan housing, in particular to a component of the fan housing.

The connection surface, in particular around the fan axis, can be curved. This advantageously ensures that the fan device can be designed to be particularly compact. The connection surface can in particular have a radius of curvature in the range from 5 cm to 100 cm. The radius of curvature can in particular be at least 10 cm, in particular at least 12 cm. It can in particular be at most 50 cm, in particular at most 30 cm, in particular at most 20 cm, in particular at most 15 cm. It is in particular at most 50%, in particular at most 30%, in particular at most 20%, in particular at most 10% larger than an outer radius of the fan wheel.

The flow function element has an inflow surface. The inflow surface is preferably defined by an area of a smallest convex envelope of the flow function element through which the conveyed air flows on the upstream side. The connection surface can be identical to the inflow surface. The inflow surface is preferably designed like the connection surface and/or curved. The connection surface can be arc-shaped, in particular circular arc-shaped, in particular circular arc-sector-shaped or annular. The connection surface is preferably designed concentrically to the fan axis. This allows the fan device to be designed even more compactly.

The connection surface can extend in the circumferential direction around the fan axis over at least 90°, in particular over at least 120°, in particular over at least 180°, in particular over at least 240°, in particular over at least 300°. Even more preferably, the connection surface completely surrounds the fan axis. In this case, the connection frame can be formed by two spaced-apart, in particular parallel, annular frame elements.

The connecting surface can overlap the fan wheel radially with the fan axis over at least 50%, in particular at least 75%, in particular at least 90%, in particular completely, with respect to an extension of the fan wheel along the fan axis. This advantageously ensures that the conveyed air can be guided from the fan wheel to the flow function element without deflection. The flow can thus be guided with particularly low resistance and energy efficiency.

A flow connection between the fan wheel and the connecting surface can be uncovered. This means that there is a visual connection between the fan wheel and the connecting surface. Due to the uncovered flow connection, the flow can be guided largely without flow deflection and is therefore particularly low-resistance and energy-efficient.

The minimum fan clearance between the connection surface and the fan axis can be a maximum of one diameter of the fan impeller. The minimum fan clearance is the distance between the connection surface and the fan axis at which the connection surface and the fan axis are closest to each other. The fan axis clearance is preferably a maximum of 85%, in particular a maximum of 75%, in particular a maximum of 65% of the diameter of the fan impeller. The fan device can thus be designed to be particularly compact. In particular, the flow guidance is particularly low-resistance and efficient.

According to a further aspect of the invention, a minimum fan wheel spacing between the connecting surface and the fan wheel is a maximum of 50%, in particular a maximum of 40%, in particular a maximum of 25%, in particular a maximum of 10%, of the diameter of the fan wheel. The minimum fan wheel spacing is understood to be the smallest distance between the connecting surface and the fan wheel. The flow can thus be guided particularly efficiently, and the fan device can be designed particularly compactly.

The connecting means can be designed for the reversible attachment of the flow function element. This means that the flow function element can be detachably connected to the connecting means. The connecting means can have a closure element for connecting the flow function element to the connecting means, in particular in a form-fitting and/or force-fitting manner. The closure element can be designed as a closure flap. In particular, the closure element comprises a latching connection. Preferably, the closure element is displaceable between a closed position and an open position. In the closed position, the flow function element is firmly and preferably airtightly connected to the connecting means. In the open position, the flow function element is removable from the connecting means. This advantageously ensures that the flow function element is replaceable, in particular after its service life has expired. The maintenance and servicing of the fan device can thus be carried out particularly easily and economically.

The liquid reservoir can be formed in one piece, in particular in one piece, with the closure element.

The flow function element can be attached to the connecting means via the intake opening or the exhaust opening. In particular, the flow function element can be reversibly attached to the connecting means from a lower space or an upper space of a kitchen countertop, in particular through an inlet opening of a vacuum duct. The installation and replacement of the flow function element are thus particularly easy to handle.

The connecting means can have a connecting rail and/or a connecting spring for positively connecting the flow function element. This allows the flow function element to be inserted into the connecting means particularly easily. The connecting means can be connected to a lower housing part and an upper housing part of the fan housing. To release the connection of the flow function element to the connecting means, the lower housing part and the upper housing part can be reversibly connected to one another. The flow function element is thus particularly easy to replace.

The connection means is preferably arranged in a positive pressure area of the fan unit, in particular the fan housing. Alternatively, the connection means can be arranged in a negative pressure area of the fan unit, in particular the fan housing.

The fan device, in particular the fan unit, can comprise a connection housing arranged in the overpressure area of the fan unit for connecting an overpressure duct. The connection housing preferably has an overpressure duct connection, in particular a connection flange, for connecting the overpressure duct. The overpressure duct connection is preferably displaceable relative to the fan housing, in particular rotatable about the fan axis. The connection housing is preferably designed such that the air is guided from the fan housing into the overpressure duct in an airtight manner.

The fan device, in particular the fan unit, can comprise an intervention guard arranged in the flow direction between the fan wheel and the connecting means. The intervention guard can be designed as a perforated plate and/or as a grid and/or as a sieve and/or in the form of, in particular, parallel bars. The intervention guard can comprise a metal material or a plastic material. Preferably, the intervention guard is made of plastic. The intervention guard advantageously ensures that the user cannot reach into the fan wheel with his hand, in particular from the side of the flow functional element. Injuries can thus be avoided.

For this purpose, the intrusion protection preferably extends completely over a flow cross-section of the fan housing.

The fan device, in particular the fan unit, can comprise a stator arranged downstream of the fan wheel. The stator is preferably arranged between the fan wheel and the connection means. The stator is preferably designed to direct the conveyed air in the direction of the flow function element. In particular, the stator ensures a deflection of the flow such that a circumferential component of the flow with respect to the axis of rotation is deflected into a flow component directed normal to the connection surface and/or to the inflow surface. For this purpose, the stator can have at least one, in particular a plurality of, stator blades, in particular with a curved shape, in particular an airfoil profile. The stator blades can be designed as guide elements. The fan device can thus be operated particularly efficiently. Flow losses due to flow components oriented parallel to the inflow surface can be reliably prevented.

Preferably, the anti-tamper device is designed in the form of the stator.

The fan wheel can feature backward-curved rotor blades. Backward-curved rotor blades are curved in the direction of the incoming airflow. This reduces turbulence, making the fan wheel particularly energy-efficient and powerful in operation.

The fan wheel can comprise a fan wheel coupling for reversible, rotationally fixed connection to a fan motor and/or a stator of the fan motor. The fan wheel coupling is preferably designed such that it reversibly provides a frictional connection and/or a positive connection to the fan motor. Preferably, the fan wheel is reversibly removable from the fan housing. This allows the fan wheel to be cleaned and kept germ-free. According to a further aspect of the invention, the fan wheel is designed as the rotor of the fan motor. Preferably, the fan wheel is rotationally driven exclusively magnetically, in particular not mechanically. The fan wheel is thus particularly easy to remove from the fan housing and clean.

A fan unit for an extractor fan can comprise a fan wheel with multiple rotor blades that can be driven in rotation about a fan axis, and a stator with multiple stator blades. Because the fan unit has the stator with multiple stator blades, it is particularly efficient and powerful in operation. The stator blades can be designed as guide elements. In particular, the stator blades can have an airfoil profile. The fan unit can also be further developed with the features of the fan unit described above and explained further below.

The fan device can comprise a safety switch for reversibly deactivating the at least one fan drive depending on the connection of the flow function element to the at least one connection means. The safety switch is preferably signal-connected to a control unit for controlling the at least one fan drive. The safety switch and/or the control unit are preferably configured such that activation of the at least one fan drive is only possible when the flow function element is connected to the connection means, in particular when the closure element is arranged in the closed position.

The conveyed air can be discharged into the environment directly via the flow function element. The flow function element has an outflow surface. The outflow surface is defined by the smallest convex envelope of the flow function element through which the conveyed air flows on the downstream side. Preferably, the conveyed air is discharged directly into the environment via the outflow surface. For this purpose, the fan housing is preferably designed without an exhaust air duct and/or without an exhaust air duct connection.

The fan housing can be designed in such a way that the conveyed air reaches the environment downstream of the flow function element without deflection.

The fan device, in particular the fan housing, can comprise a fastening means for fastening the fan unit. The fastening means is preferably designed for fastening to a wall. In particular, the fastening means can be designed for fastening to a wall with a surface normal oriented obliquely, in particular perpendicularly, to the fan axis. The fastening means preferably has a, in particular flat, wall connection plane. The fastening means, in particular the wall connection plane, preferably forms part of the connection frame. In particular, the wall connection plane can surround the flow function element in the circumferential direction around the fan axis via The flow function element can be hermetically sealed to the fastening device. This advantageously enables particularly simple and space-saving installation of the fan unit on a wall.

A minimum distance of the fastening means from the fan axis can be less than a maximum distance of the connection means from the fan axis. The fastening means, in particular a wall connection surface of the fastening means, preferably has a minimum distance from the fan axis that is less than a maximum distance, in particular a minimum distance, of the fan axis from the connection means and/or the flow function element. The fan device, in particular the fan unit, can thus be mounted on a wall in a particularly space-saving manner.

The safety switch can be arranged on the fastening means. The safety switch can be a mechanical contact switch and/or a Hall sensor and/or a magnetic sensor.

The inflow surface of the flow function element can be curved. This advantageously allows the fan device to be designed particularly compactly and operated with high flow efficiency.

The flow function element, in particular the air filter, can be designed to be reversibly deformable.

The flow function element can be designed to be flexible around a bending axis, in particular the fan axis. Preferably, the inflow surface of the flow function element is deformable between a first curvature and a second curvature that differs from the first. In particular, the inflow surface can be bent from a flat shape into a round shape, in particular a circular shape, in particular one arranged concentrically to the fan axis. Preferably, the flow function element is elastically deformable.

The air filter may have an elastic frame. The frame is preferably designed to seal against the connecting means.

The frame can comprise, in particular consist of, a fleece, in particular a mineral fleece and/or a glass fleece and/or a foam, in particular a plastic foam, in particular a soft-elastic plastic foam.

The invention is also based on the object of creating an improved hob system.

This object is achieved according to the invention by a cooktop system comprising at least one cooktop and an extractor device for extracting cooking fumes downwards with at least one built-in fan according to the preceding description. It has been recognized that a cooktop system with at least one cooking zone and the extractor device described above can be designed to be particularly compact and is particularly economical in operation. The compact design of the cooktop system enables, in particular, the use of a space beneath the cooktop system as storage space. The cooktop system is preferably designed as an assembly unit. This advantageously ensures that the cooktop system can be attached particularly easily to a kitchen base cabinet, in particular to a worktop. Preferably, a cooktop of the cooktop system completely overlaps the fan device, in particular the fan unit, in a plan view. This arrangement makes the fan device, in particular the flow function element, particularly easy to access and, in particular, replaceable. The advantages of the cooktop system according to the invention correspond to the advantages of the extractor device, the fan device, and the fan unit explained above. In particular, the hob system can be further developed with the features of the extractor hood, the fan device and the fan unit.

The hob system may comprise a supporting structure, in particular a supporting wall, in particular a housing wall, to which the fan device is attached by means of the fastening means.

• 1 eine perspektivische Darstellung eines Kochfeldsystems mit mehreren Kochstellen und einer Dunstabzugsvorrichtung, verbaut in einem Küchenunterschrank,
• 2 eine Schnittdarstellung des Kochfeldsystems entlang der Schnittlinie II-II in 1, wobei die Dunstabzugsvorrichtung einen Unterdruckkanal und eine damit verbundene Lüftereinrichtung zum Ansaugen von Kochdünsten in den Unterdruckkanal aufweist,
• 3 eine perspektivische Darstellung der Lüftereinrichtung in 2 mit einer Lüftereinheit und einem daran angeschlossenen, als Luftfilter ausgebildeten Strömungsfunktionselement,
• 4 eine Explosionsdarstellung der Lüftereinrichtung in 2,
• 5 eine perspektivische Darstellung der Lüftereinrichtung in 2 mit einem Anschlussgehäuse zum Anschluss eines Überdruckkanals,
• 6 eine perspektivische Darstellung eines Funktionsmittelträgers, insbesondere für einen Luftfilter, wobei der Funktionsmittelträger in einer Verschlussstellung angeordnet ist,
• 7 eine perspektivische Darstellung des Funktionsmittelträgers in 6, wobei der Funktionsmittelträger in einer Offenstellung angeordnet ist,
• 8 eine perspektivische Darstellung eines Kochfeldsystems mit einer Dunstabzugsvorrichtung zum Abzug von Kochdünsten, welche eine Lüftereinrichtung umfasst, die als Einbaulüfter zum Einbau in einen Küchenunterschrank ausgebildet ist,
• 9 eine Schnittdarstellung entlang der Schnittlinie IX-IX in 8, wobei der Einbaulüfter eine Kanalkopplung zum Verbinden mit einem Strömungskanal der Vorrichtung zum Abzug von Kochdünsten, ein Befestigungsmittel zum Befestigen des Einbaulüfters an dem Küchenunterschrank und eine Filteraufnahme zum reversiblen Aufnehmen eines Filters aufweist,
• 10 eine Schnittdarstellung des Einbaulüfters in 8 weiter im Detail,
• 11 eine Schnittdarstellung einer Sockelleiste des Küchenunterschranks in 8, wobei die Sockelleiste einen Filter aufweist,
• 12 eine perspektivische Darstellung eines Einbaulüfters gemäß einer weiteren Ausführungsform, wobei eine Filteraufnahme des Einbaulüfters derart ausgebildet ist, dass ein Filter entlang einer Lüfterachse in den Einbaulüfter, insbesondere durch eine Lüfteraussparung einer Bodenwand des Küchenunterschranks, reversibel entnehmbar ist,
• 13 eine perspektivische Darstellung eines Einbaulüfters gemäß einer weiteren Ausführungsform, wobei der Einbaulüfter über ein Befestigungsmittel an einem Boden eines Küchenunterschranks angebracht ist und wobei der Einbaulüfter eine Filterschublade aufweist, in welche zwei der Filter einsetzbar sind,
• 14 eine perspektivische Darstellung eines Einbaulüfters gemäß einer weiteren Ausführungsform, wobei eine Filteraufnahme des Einbaulüfters eine gekrümmte Querschnittsfläche aufweist und, wobei der Einbaulüfter eine Filterwechselkammer aufweist, durch welche der Filter aus der Filteraufnahme über eine Vorderseite eines Sockelraums des Küchenunterschranks aus dem Einbaulüfter entnehmbar ist, und
• 15 eine perspektivische Darstellung eines Einbaulüfters gemäß einer weiteren Ausführungsform, wobei der Einbaulüfter in einem Eckbereich des Küchenunterschranks angeordnet ist und, wobei eine Lüfterkammer, in der das Lüfterrad angeordnet ist, in einer Draufsicht rechteckförmig ausgebildet ist, und wobei zwei der vertikalen Seitenwände der Lüfterkammer eine Filteraufnahme mit jeweils ebenem Strömungsquerschnitt aufweisen.

Further features, advantages, and details of the invention will become apparent from the following description of the hob system, the extractor hood, the fan device, and the fan unit with reference to the figures. They show:

• 1 a perspective view of a hob system with several cooking zones and an extractor hood, installed in a kitchen base unit,
• 2 a sectional view of the hob system along the section line II-II in 1 , wherein the extractor device has a vacuum duct and a fan device connected thereto for sucking cooking fumes into the vacuum duct,
• 3 a perspective view of the fan device in 2 with a fan unit and a flow function element connected to it, designed as an air filter,
• 4 an exploded view of the fan device in 2 ,
• 5 a perspective view of the fan device in 2 with a connection housing for connecting an overpressure channel,
• 6 a perspective view of a functional carrier, in particular for an air filter, wherein the functional carrier is arranged in a closed position,
• 7 a perspective view of the functional device in 6 , wherein the functional means carrier is arranged in an open position,
• 8 a perspective view of a hob system with an extractor device for extracting cooking fumes, which comprises a fan device designed as a built-in fan for installation in a kitchen base unit,
• 9 a sectional view along the section line IX-IX in 8 , wherein the built-in fan has a duct coupling for connecting to a flow duct of the device for extracting cooking fumes, a fastening means for fastening the built-in fan to the kitchen base unit and a filter holder for reversibly receiving a filter,
• 10 a sectional view of the built-in fan in 8 further in detail,
• 11 a sectional view of a skirting board of the kitchen base unit in 8 , the skirting board has a filter,
• 12 a perspective view of a built-in fan according to a further embodiment, wherein a filter receptacle of the built-in fan is designed such that a filter can be reversibly removed along a fan axis into the built-in fan, in particular through a fan recess in a bottom wall of the kitchen base unit,
• 13 a perspective view of a built-in fan according to a further embodiment, wherein the built-in fan is attached to a floor of a kitchen base cabinet via a fastening means and wherein the built-in fan has a filter drawer into which two of the filters can be inserted,
• 14 a perspective view of a built-in fan according to a further embodiment, wherein a filter receptacle of the built-in fan has a curved cross-sectional area and wherein the built-in fan has a filter change chamber through which the filter can be removed from the filter receptacle via a front side of a base space of the kitchen base unit, and
• 15 a perspective view of a built-in fan according to a further embodiment, wherein the built-in fan is arranged in a corner region of the kitchen base cabinet and wherein a fan chamber in which the fan wheel is arranged is rectangular in plan view, and wherein two of the vertical side walls of the fan chamber have a filter holder each with a flat flow cross-section.

Based on the 1 until 4 Various details of a hob system 1 with a hob 2 and an extractor hood 3 are described below. The hob 2 has four cooking zones 2a for heating food 4. The hob system 1 is attached to a kitchen base cabinet 5. In particular, the hob system 1 is attached to a worktop 6 of the kitchen base cabinet 5. A food support 7 of the hob 2 is designed as a glass-ceramic plate. An upper side of the food support 7 is arranged flush with an upper side of the worktop 6. The hob 2 and the extractor hood 3 can be controlled by means of a control device 8. The control device 8 has a control panel 9 for user inputs. The control panel 9 is designed as a touch-sensitive screen.

The extractor device 3 has a vacuum duct 10 with an inlet opening 11 for the inflow of ambient air containing cooking fumes. An inlet grille 12 is arranged above the inlet opening.

Each of the cooking zones 2a comprises an energy transmission means 13. The energy transmission means 13 are designed as induction coils. An electronics housing 14 encloses the energy transmission means 13 together with the cooking food support 7.

An intake filter 15 is arranged in the vacuum channel 10. The intake filter 15 comprises a liquid tray 16 for collecting overflow liquid and a gas-permeable, in particular cooking vapor-permeable, wall region 17. The intake filter 15 is essentially rotationally symmetrical about a vertical axis. In particular, the wall region 17 is cylindrical in shape.

The inlet opening 11 is circular in a plan view. In a plan view, the inlet flow opening 11 a vacuum channel tray 18 for collecting overflow liquid.

An overall height H of the cooktop system 1 is determined by a distance between the top of the cooking support 7 and a bottom of the vacuum channel 10. The overall height H is 150 mm.

The extractor device 3 has a fan device 19 for conveying the air loaded with cooking vapors. The fan device 19 is connected to the inlet opening 11 via the vacuum duct 10.

The fan device 19 comprises a fan unit 20 and a flow function element 21 connected thereto. The flow function element 21 is designed as an air filter. The fan unit 20 comprises a fan wheel 22, which can be driven in rotation about a fan axis 24 by means of a fan drive 23, a fan housing 25, which at least partially surrounds the fan wheel 22, and a connection means 26 connected to the fan housing 25 for connecting the flow function element 21.

In the 3 and 4 The fan device 19 is shown in further detail. The fan drive 23 is an electric motor. A rotational axis of the fan drive 23 is arranged concentrically to the fan axis 24. The fan axis 24 is oriented vertically.

The fan housing 25 has an intake flange 27 for an airtight connection to the vacuum duct 10. The intake flange 27 is arranged concentrically to the fan axis 24. The fan housing 25 is arranged on the vacuum duct 10 such that a vertical, upward flow component flows through an intake opening 28 of the fan housing 25. In particular, the intake opening 28 is arranged on an underside of the fan housing 25.

The fan housing 25 has a lower housing part 29 and an upper housing part 30. The intake flange 27 is attached to the lower housing part 29. A fastening means 31 of the fan housing 25 extends between the lower housing part 29 and the upper housing part 30. The fastening means 31 is designed to fasten the fan device 19, in particular to a flat surface. For this purpose, the fastening means 31 has a flat wall connection plane 32.

The fastening means 31 is designed in particular for fastening the fan unit 20 to a wall 32a. The wall 32a can be a building wall, in particular a vertical one, and/or a wall of a kitchen base cabinet or one of the connecting walls 50. In the present case, the fan unit 20 is attached to a supporting wall 32a of the cooktop system 1. In the wall connection plane 32, the fastening means 31 contacts the wall 32a. A fan wheel-to-wall distance x _RW , which is defined as the minimum distance between the wall connection plane 32 and the fan wheel 22, is 20 mm. The radial extent r _L of the fan wheel 22 is 80 mm. A transverse dimension x _Q of the fan housing 25, which corresponds to a maximum extent of the fan housing 25 parallel to the wall connection plane 32 and perpendicular to the fan axis 24, is preferably 300 mm. A maximum fan axis-to-housing distance x _LG , which is determined by the maximum distance between the fan axis 24 and a section of the fan housing 25 furthest away therefrom, is preferably 150 mm. An intake opening-to-wall distance x _AW is determined by the minimum distance between the intake opening 28 and the wall connection plane 32. The intake opening-to-wall distance x _AW is preferably 35 mm. An intake opening radius r _A is preferably 65 mm. A fan axis-to-wall distance x _LW is determined by the minimum distance between the fan axis 24 and the wall connection plane 32. The fan axis-to-wall distance x _LW is preferably 100 mm. A rotation plane 32b is oriented perpendicular to the fan axis 24.

The fan wheel 22 is connected to the fan drive 23 in a rotationally fixed manner. The fan wheel 22 is designed as a radial fan wheel. To convey the air, the fan wheel 22 comprises a plurality of rotor blades 33. The rotor blades 33 are curved backward with respect to a direction of rotation of the fan wheel 22. This means that the rotor blades 33 are curved following an inflow direction.

The fan unit 20 has an anti-tamper device 34. The anti-tamper device 34 is designed as an air-permeable grille. It extends between the lower housing part 29 and the upper housing part 30. In particular, the anti-tamper device 34 is designed in such a way that it reliably prevents a hand from reaching into the fan wheel 22 from an overpressure area of the extractor device 3. For this purpose, the anti-tamper device 34 is arranged downstream of the fan wheel 22 in the direction of flow.

Downstream of the intervention protection 34, the flow function element 21 is arranged. The flow function element 21 is designed as an odor filter, in particular as an activated carbon filter, in particular with a pleated activated carbon layer. The odor filter is reversibly, in particular elastically, deformable. In particular, the odor filter is a bending axis oriented transversely to its longitudinal extent. The bending axis coincides with the fan axis 24. In particular, the bending axis is oriented parallel to the folds of the pleated filter layer.

The fan unit 20 further comprises a liquid reservoir 37a. The liquid reservoir 37a is designed as a collecting tray. The liquid reservoir 37a is reversibly connectable to the housing base 29 by means of a snap-in connection 37b. The housing base 29 is designed to slope monotonically toward the liquid reservoir 37a and includes an overflow edge 37c. In particular, the housing base 29 is designed such that liquids, in particular water and/or greases and/or oils, are guided by gravity over the overflow edge 37c into the liquid reservoir. The housing base 29, together with the liquid reservoir 37a, forms a cover element 37d. The cover element 37d closes the overpressure area of the extractor device 3 and blocks the flow function element 21 in the fan housing 25.

The flow function element 21 is connected to the connecting means 26. The connecting means 26 is designed as a connecting rail 35. The connecting rail 35 is formed by a lower part groove 36 provided in the housing lower part 29 and an upper part groove 37 provided in the housing upper part 30.

The flow function element 21 can be reversibly inserted into the connecting rail 35. By means of a sealing element 38, the flow function element 21 is connected in a substantially airtight manner to the connecting rail 35 and the fastening means 31. The sealing element 38 is formed by a flexible frame of the flow function element 21. For this purpose, the sealing element 38 comprises a glass fleece.

For reversibly connecting the flow function element 21 to the connection means 26, the fastening means 31 can be reversibly connected to the housing lower part 29 and/or the housing upper part 30. With the fastening means 31 removed, the flow function element 21 can be easily inserted into the connection rail 35. The flow function element 21 can also be removed from the opposite side of the fastening means 31, for example, by simply pulling it towards it, particularly after a locking device has been released/removed. This can be particularly advantageous when the fan is mounted on a base, especially if access to the fastening means 31 is blocked, for example, when it is arranged in front of a wall.

The connecting rail 35, together with the fastening means 31, forms a connecting frame 39, which surrounds a connecting surface 40 through which the conveyed air flows. The flow function element 21 is connected to the fan housing 25 in a substantially airtight manner via the connecting frame 39. All of the conveyed air is guided through the connecting frame 39, in particular through the connecting surface 40. The connecting surface 40 is an inflow surface 42 of the flow function element 21, oriented parallel to the fan axis 24.

The connecting surface 40 is curved, in particular in the shape of a circular arc, in particular concentric with the fan axis 24. The connecting surface 40 surrounds the fan axis 24 in the circumferential direction over an angular range α of approximately 300°. Radially to the fan axis 24, the connecting surface 40 completely overlaps the fan wheel 22.

A flow connection between the fan wheel 22 and the connecting surface 40 is largely uncovered for efficient flow guidance. There is at least a visual connection between the connecting surface 40 and the fan wheel 22. The interference protection 34 arranged between the fan wheel 22 and the connecting surface 40 has negligible flow resistance.

A fan axis distance a _L of the connection surface 40 from the fan axis 24 is 60% of a diameter D of the fan wheel 22. A fan wheel distance a _R of the connection surface 40 from the fan wheel 22 is 10% of the diameter D of the fan wheel 22. The diameter D is, for example, in the range from 140 mm to 200 mm.

The fan unit 20 has a safety switch 41. The safety switch 41 is designed to detect the connection of the flow function element 21 to the connection means 26. The safety switch 41 is in signal communication with the control device 8. The fan drive 23 can be reversibly deactivated based on the signal from the safety switch 41.

• Mittels des Bedienfelds 9 der Steuereinrichtung 8 wird dasjenige Energieübertragungsmittel 13 der jeweiligen Kochstelle 2a aktiviert, über dem das Kochgut 4 angeordnet ist. Über das Bedienfeld 9 kann der Benutzer ferner die Dunstabzugsvorrichtung 3 aktivieren. Die Dunstabzugsvorrichtung 3, insbesondere der Lüfterantrieb 23 ist nur aktivierbar, wenn das Strömungsfunktionselement 21 an dem Anschlussmittel 26 angeschlossen ist und somit den Sicherheitsschalter 41 betätigt. Zum Anschluss des Strömungsfunktionselements 21 kann das Befestigungsmittel 31 von dem Gehäuseunterteil 29 und dem Gehäuseoberteil 30 abgenommen werden.

The extractor device 3 is designed without an overpressure duct 43. The extracted air is discharged directly into the environment via the flow function element 21. The hob system 1 with the extractor device 3, the fan device 19, and the fan unit 20 functions as follows:

• The control panel 9 of the control device 8 activates the energy transmission means 13 of the respective cooking zone 2a above which the cooking item 4 is arranged. The user can also activate the extractor device 3 via the control panel 9. The device 3, in particular the fan drive 23, can only be activated when the flow function element 21 is connected to the connection means 26 and thus actuates the safety switch 41. To connect the flow function element 21, the fastening means 31 can be removed from the lower housing part 29 and the upper housing part 30.

The anti-tamper device 34 prevents manual intervention into the fan wheel 22, in particular the rotor blades 33, from an overpressure area of the extractor fan 3. The risk of injury is reduced, particularly in the event of a malfunction of the safety switch 41. In addition, injuries from sharp-edged rotor blades 33 can be reliably prevented. The flow function element 21 can then be inserted into the connecting rail 35 of the connecting means 26. An inflow surface 42 of the flow function element 21 is initially flat. When inserted into the arcuate connecting rail 35, the flow function element 21 is curved around the fan axis 24. The inflow surface 42 is converted into a circular arc. The flow function element 21 connected to the connecting means 26 has a cylindrical jacket-shaped inflow surface 42 configured concentrically to the fan axis 24.

The fastening means 31 is reconnected to the lower housing part 29 and the upper housing part 30. The safety switch 41 arranged on the fastening means 31 comes into contact with the flow function element 21, is thereby actuated, and thus detects the connection of the flow function element 21 to the connecting means 26.

The extractor hood 3, in particular the fan drive 23, can be activated. The fan drive 23 is supplied with electrical energy by means of the control device 8. The fan drive 23 rotates the fan wheel 22. A vacuum is generated. Air containing cooking vapors is drawn in from an upper chamber of the cooktop system 1 via the inlet opening 11, guided through the vacuum duct 10 to the fan device 19, and then reaches the fan wheel 22 via the intake opening 28. The conveyed air flows through the rotor blades 33, through the intrusion guard 34, and into the flow function element 21. In the flow function element 21, odorous substances are filtered out of the air. The air flows directly from the flow function element 21 into the environment.

After a certain period of operation, the flow function element 21 designed as an air filter becomes saturated. The flow function element 21 can be removed as described above by removing the fastening means 31 from the connecting means 26, in particular from the connecting rail 35, and replaced by a functional flow function element 21.

Advantageously, the arrangement of the flow function element 21 directly on the fan unit 20 ensures that the fan device 19 can be designed in a particularly space-saving manner. This allows the hob system 1 to be integrated particularly flexibly into kitchen furniture 5. In particular, the space available beneath the hob system 1 can largely be retained as storage space.

Based on the 5 A further exemplary embodiment of a cooktop system 1, an extractor hood 3, a fan device 19, and a fan unit 20 is described below. In contrast to the exemplary embodiment described above, the extractor hood 3 comprises an overpressure duct 43. The air sucked in via the inlet opening 11 and guided through the flow function element 21 is not released directly into the environment, but is guided into the overpressure duct 43. For this purpose, the extractor hood 3 comprises a connection housing 44. The connection housing 44 surrounds an outflow surface 45 of the flow function element 21. Together with the fan housing 25, the connection housing 44 forms a duct section that is airtight with respect to the environment. The connection housing 44 comprises a connection flange 46. The overpressure duct 43 is attached in an airtight manner to the connection flange 46.

The functional principles of the cooktop system 1, the extractor hood 3, the fan device 19, and the fan unit 20 essentially correspond to the functional principles of the previously described embodiment. In contrast, the conveyed air is not discharged directly into the environment via the discharge surface 45. The air flowing out of the flow function element 21 is directed into the overpressure duct 43 by means of the connection housing 44 via the connection flange 46.

This advantageously makes it possible for the air extracted above the hob system 1 and possibly containing moisture to be further processed or discharged from the kitchen area.

Based on the 6 and 7 Details of a functional element carrier 47 of the extractor device 3 are described below. Functional element carrier 47 can be part of the connecting means 26.

The functional element carrier 47 is designed to fasten a flow functional element 21, in particular an air filter, in particular an odor filter.

The functional element carrier 47 comprises fastening elements 48 in the form of elongated holes oriented transversely to one another. The functional element carrier 47 can thus be fastened to a substrate using conventional screw elements. The functional element carrier 47 has a fastening wall 49 and three connecting walls 50. The fastening elements 48 are arranged on the fastening wall 49. The connecting walls 50 are hingedly connected to the fastening wall 49. In particular, the connecting walls 50 are connected to the fastening wall 49 via film hinges.

The connecting walls 50 have flow openings 51. Due to the flow openings 51, the connecting walls 50 are permeable to fluids. The flow function element 21 can be inserted into the fastening element 48 such that the outflow surface 45 rests against the connecting walls 50. Thus, the conveyed air can flow out through the flow openings 51.

The connecting walls 50 comprise wall connectors 52. By means of the wall connectors 52, the connecting walls 50 can be reversibly connected to one another, in particular locked.

The functional element carrier 47 is reversibly movable between a closed position and an open position. In the closed position, the wall connectors 52 of the connecting walls 50 are locked together. In the 6 the functional element carrier 47 is shown in the closed position.

In the open position, the wall connectors 52 of the adjacent connecting walls 50 are separated from each other. The functional element carrier 47 is in the open position.

In the closed position, the flow function element 21 is firmly connected to the functional element carrier 47. In the open position, the flow function element 21 can be removed from the functional element carrier 47. Preferably, the functional element carrier 47 is a component of the fan housing 25, in particular of the connecting means 26. The flow function element 21 can thus be removed particularly easily from the fan unit 20. In particular, the flow function element 21 is thus particularly easy to replace. Maintenance of the cooktop system 1, in particular of the extractor hood device 3, is thus particularly simple and economical.

By arranging the wall connection plane 32 on the fan wheel 22 such that the ratio of the fan wheel-to-wall distance x _RW to the radial extension r _L of the fan wheel 22 is a maximum of 0.5, in particular 0.25, the fan device 19, in particular the fan unit 20, can be attached to the wall 32a in a particularly compact and space-saving manner. In particular, the vacuum duct 10 can be laid particularly close along the wall 32a, thereby saving additional installation space. The small ratio between the intake opening-to-wall distance x _AW and the radial extension r _L of the fan wheel 22 of a maximum of 1.0, in particular less than 0.5, enables the arrangement of the vacuum duct 10, in particular in the connection area to the fan device 19, at a particularly short distance from the wall 32a.

Based on the 8 until 10 An exemplary embodiment of a fan device 19 according to the invention is described, which is designed as a built-in fan 19 for installation in a kitchen base cabinet 5. The built-in fan 19 is arranged at least partially in a base space 53 of the kitchen base cabinet 5. A flow channel in the form of a vacuum channel 10 extends between the inlet opening 11 of the extractor hood 3 and an intake opening 28 of the built-in fan 19. An inlet grille 28a is arranged in the region of the intake opening 28. The built-in fan 19 is connected to the vacuum channel 10 via a channel coupling, which is designed in the form of an intake flange 27. The resulting air flow 54 is shown by dashed arrows.

The built-in fan 19 is designed as a radial fan. The rotor blades 33 of the fan wheel 22 are curved backward. A fan axis 24 is oriented vertically.

The connecting flange 27 is designed as a plug-in connection. The connecting flange 27 has a circumferential connection seal 27a. The vacuum duct 10 comprises a horizontal piece 10a, which adjoins the inlet opening 11 along the air flow 54. The horizontal piece 10a has a channel bend section 55 for deflecting the cooking vapor flow by 90°, in particular from a horizontal to a vertical flow direction. The horizontal piece 10a guides the cooking vapors at least partially in a horizontal direction, into the area of a rear wall 56 of the kitchen base unit 5. A vertical piece 10b of the vacuum duct 10 extends at least partially, in particular exclusively, in vertical direction, in particular along the rear wall 56. The horizontal piece 10a and the vertical piece 10b are preferably formed at least in sections, in particular completely, as flat channels.

A connecting piece 10c of the vacuum duct 10 connects the built-in fan 19 to the vertical piece 10b. The inflow cross-section and the outflow cross-section of the connecting piece 10c are preferably oriented parallel to each other. The outflow cross-section of the connecting piece 10c is preferably round, in particular circular. The inflow cross-section of the inflow piece 10c is preferably shaped like the cross-section of a flat duct, in particular rectangular, in particular with rounded corners.

The intake flange 27 is designed as a plug-in connection. Alternatively, the connection flange 27 can be designed as a screw connection and/or a bayonet connection.

The fastening means 31 is designed in the form of a circumferential collar. The fastening means 31 has a wall connection plane 32, at which the fastening means 31 contacts the wall 32a of the kitchen base cabinet 5. The area in which the fastening means 31 contacts the wall 32a is referred to as the contact surface 57. The contact surface 57 is circular in shape.

The fastening means 31, in particular the contact surface 57, projects radially from the fan axis 24, the fan wheel 22, and the fan housing 25. The fastening means 31 is further configured such that the built-in fan extends at least partially onto a side of the wall connection plane 32 opposite the fastening means 31. This advantageously allows the built-in fan 19 to protrude into a fan recess 58 in the wall 32a. The wall 32a is a bottom wall 59 of the kitchen base cabinet 5 adjacent to the base space 53.

In particular, the built-in fan 19 is designed such that the fan wheel 22 and the fan housing 25 can be displaced at least partially, in particular completely, through the fan recess 58 for attaching the built-in fan 19 to the wall 32a, in particular with the contact surface 57 contacting the bottom wall 59.

The built-in fan 19 has a silencer 60. The silencer 60 is arranged downstream of the fan impeller 22. The silencer 60 is integrated into the fan housing 25.

The fastening means 31 has a vibration-damping support 61 for contacting the wall 32a. The vibration-damping support 61 comprises a rubber-elastic material. The contact surface 57 is arranged on the vibration-damping support 61.

The built-in fan 19, in particular the fan housing 25, has a connection means 26 in the form of a filter holder for reversibly receiving a filter 62 for cleaning the air. The connection means 26 is designed for a positive connection to the filter 62, in particular for establishing a bayonet connection with the filter 62. The connection means 26 has a circumferential sealing element 38 for an airtight connection to the filter 62.

The filter 62 is designed as an odor filter. For this purpose, the filter 62 comprises a filter basket 63 filled with filter material, in particular activated carbon granules. The filter 62 is essentially plate-shaped. A filter inflow opening 64 is arranged on an upper side of the filter 62. A filter outflow opening 65 is arranged on an underside of the filter 62. The filter 62 can also have a filter outflow opening 65 in a side region, in particular in the region of a wall whose orientation has a vertical component, in particular is oriented vertically. The filter outflow opening 65 can extend over the underside and the side region of the filter 62. The filter inflow opening 64 and the filter outflow opening 65 are closed with an air-permeable filter grid 66.

The filter 62 has an annular liquid tray 16 for collecting overflow liquid, condensate, oils and/or greases.

The overall height h of the built-in fan 19 is 100 mm. The immersion height h _E of the built-in fan 19, which corresponds to the extension of the built-in fan 19 in the vertical direction, in particular along the fan axis 24, on a side of the wall connection plane 32 opposite the fastening means 31, is 75 mm. The support height h _A of the built-in fan 19, which is measured as the extension of the built-in fan 19 from the wall connection plane 32 and with respect to the wall connection plane 32 on the side of the fastening means 31, is 25 mm.

A diameter D of the fan wheel 22 can be 220 mm. An overall dimension B of the built-in fan 19 in the horizontal direction is preferably in a range from 100 mm to 800 mm, in particular from 200 mm to 600 mm, in particular from 300 mm to 500 mm. In particular, the overall dimension B can be 320 mm.

The built-in fan 19 with the duct coupling 27, the fan wheel 22, the fastening means 31, and the filter holder is designed as an assembly unit. In particular, the aforementioned components are permanently connected to one another, in particular, in a manner that cannot be removed without damage. In particular, the duct coupling 27, the fastening means 31, and the filter holder are integrally connected to the fan housing 25, to which the fan wheel 22 is attached.

• Zur Montage des Einbaulüfters 19 wird eine kreisförmige Lüfteraussparung 58 in die Bodenwand 59 des Küchenunterschranks 5 eingebracht. Der Einbaulüfter 19 wird von oben in die Lüfteraussparung 58 eingesetzt. Der Einbaulüfter 19 liegt mit dem Befestigungsmittel 31, insbesondere der schwingungsdämpfenden Auflage 61 auf der Bodenwand 59 auf. Insbesondere kontaktiert der Einbaulüfter 19 die Bodenwand 59 an einer Kontaktfläche 57.

The hob system 1 with the extractor hood 3 and the built-in fan 19 operates as follows:

• To install the built-in fan 19, a circular fan recess 58 is made in the base wall 59 of the kitchen base cabinet 5. The built-in fan 19 is inserted into the fan recess 58 from above. The built-in fan 19 rests on the base wall 59 with the fastening means 31, in particular the vibration-damping support 61. In particular, the built-in fan 19 contacts the base wall 59 at a contact surface 57.

In the vertical direction downwards, the built-in fan 19 extends over the immersion height h _E into or through the fan recess 58. In the vertical direction upwards, the built-in fan extends from the wall connection level 32 over the support height h _A .

The vacuum duct 10, in particular the connecting piece 10c, is connected to the built-in fan 19 via the intake flange 27 in a flow-conducting manner.

The filter 62 is attached to the connection means 26 from below, via the base space 53. The filter 62 is fluidly connected to the built-in fan 19, in particular the fan housing 25, via the filter inlet opening 64. The airtight connection of the filter 62 to the built-in fan 19 is achieved by the sealing element 38.

Otherwise, the functioning of the hob system 1, the extractor hood 3 and the built-in fan 19 corresponds to the functioning of the corresponding components according to the embodiments described above.

Based on the 11 A skirting board 67 with a filter function is described. The skirting board 67 has a filter 62 for filtering air, in particular an odor filter. The skirting board 67 comprises two strip walls 68. The strip walls 68 are oriented parallel to one another. Perpendicular to a main extension plane of the strip walls 68, these are arranged at a distance from one another. The strip walls 68 overlap one another in the direction perpendicular to their main extension plane. The filter 62 is arranged between the strip walls 68, in particular in the overlapping area between the strip walls 68. The skirting board 67, in particular the strip walls 68, are oriented vertically in the kitchen base cabinet 5. The strip walls 68 each have a strip seal 68a for sealing against the cabinet wall 32a or the floor 78. The strip seals 68a are arranged on the narrow sides of the strip walls 68, in particular glued, plugged, screwed, or positively received therein. The strip seals 68a rest in contact with the walls 32a, 78. The strip seals 68a can comprise a lamella seal, a foam rubber seal, or a foam sealing strip. Accordingly, the air flow through the filter 62 is oriented vertically. The baseboard 67 has a decorative layer 69. The decorative layer 69 is attached to the strip wall 68 opposite the base space 53.

The above-described skirting board 67 with filter function can be used alternatively or in addition to the above-described filters 62.

Based on the 12 A further embodiment of the built-in fan 19 is described. In contrast to the built-in fan 19 described above, the connection means 26 is designed for the reversible removal of the filter 62 in a vertical direction upwards, in particular parallel to the fan axis 24 and/or the intake direction of the built-in fan 19. Furthermore, a connection surface 40 of the connection means 26 is curved. The air conveyed by the fan wheel 22 flows into the filter 62 via the connection surface 40. The filter 62 rests against the connection surface 40 and accordingly has a curved inflow surface 42. The connection surface 40 and the inflow surface 42 are curved in a circular arc, at least in sections.

The built-in fan 19 has a removal opening 70 for removing the filter 62 from the connection means 26. The removal opening is oriented parallel to the wall connection plane 32, in particular horizontally. The removal opening 70 can be reversibly closed by means of a separate filter cover 71. Alternatively to the separate design, the filter cover 71 can be formed as a component of the built-in fan 19, in particular as a flap, or can be formed integrally with the filter 62.

The built-in fan 19 has a filter chamber 72. The filter 62 can be held in a form-fitting manner in the filter chamber 72. Preferably, at least one of the walls of the filter chamber 72 has a perforation, in particular a hole structure. This can provide protection against reaching into the fan wheel 22.

The operation of the built-in fan 19 corresponds to the operation of the built-in fan 19 according to the embodiment described above.

Based on the 13 A further embodiment of a built-in fan 19 is described. In contrast to the embodiments described above, the built-in fan 19 has a filter drawer 73. Two of the connection means 26, which are designed as filter receptacles for reversibly receiving a filter 62 each, are attached to the filter drawer 73. The respective connection means 26 has a reversibly variable longitudinal dimension 1. The longitudinal dimension 1 is measured along a main extension direction of the respective connection means 26, in particular in the horizontal direction. The longitudinal dimension 1 is designed for installation in kitchen base cabinets 5 of different cabinet depths _TS . The longitudinal dimension 1 is reversibly variable between 450 mm and 650 mm. For this purpose, the connection means 26 has a telescopic connection frame 39.

The fastening means 31 is designed for inserting the built-in fan 19 from above through the fan recess 58 into the base space 53. For this purpose, the fastening means 31 has a circumferential collar. In particular, the fastening means, in particular the contact surface 57, projects beyond the fan wheel 22 and the fan housing 25 in the radial direction to the fan axis 24.

The filter drawer 73 with the connection means 26 can be reversibly displaced between an operating position and a removal position via a side surface of the base space 53. In the operating position, the filter drawer 73 with the connection means 26 forms a fluid-conducting connection, in particular a flow chamber, between the fan wheel 22 and the filters 62, which is essentially airtight to the environment. The filters 62 are inaccessible for removal in the operating position.

In the removal position, there is no airtight connection between the fan wheel 22 and the filters 62. The flow space between the fan wheel 22 and the filters 62 is open to the environment. In the removal position, the filters 62 can be removed from the respective connection means 26.

Between the operating position and the removal position, the filter drawer 73 can be displaced horizontally, in particular along the depth direction of the kitchen base cabinet 5, in particular linearly. A linear guide, in particular drawer rails, can be provided for this purpose.

Preferably, the filters 62 are also reversibly deformable, particularly expandable, and particularly compressible, particularly along their longitudinal extent. Thus, a single, particularly economically producible type of filter element 62 can be used for different cabinet depths Ts.

For particularly efficient flow to the filters 62, the filter drawer 73 has flow guide elements 74.

The built-in fan 19 has a fan stator 75 with several stator blades 76 to increase the extraction efficiency.

The filter drawer 73 further comprises a base support, in particular a base foot 77. The base foot 77 supports the bottom wall 59 against the floor 78. The base foot 77 has a clearance fit with the bottom wall 59 and the floor 78, thus enabling smooth movement of the filter drawer 73. When the bottom wall 59 is subjected to a vertical load, the base foot 77 comes into contact with the bottom wall 59 and the floor 78 and can thus exert its supporting effect.

Otherwise, the functionality of the built-in fan 19 corresponds to the functionality of the built-in fans 19 described above. According to an alternative embodiment (not shown), it is not the connection means 26 of the filter drawer 73 that are reversibly adjustable with respect to their longitudinal dimension 1, but rather an air-impermeable side wall of the filter drawer 73. This advantageously allows the filters 62 to be rigidly designed, i.e., not reversibly adjustable in length. For example, the filter drawer 73 can have a telescopic side wall for this purpose.

According to a further embodiment not shown, the fan wheel 22 is attached to the filter drawer 73. In other words, the entire built-in fan 19 is attached to the filter drawer 73. The fastening means 31 can be designed for the displaceable fastening of the built-in fan 19 to the kitchen base cabinet 5 by fastening the drawer 73, in particular the linear guide. For the reversibly airtight connection of an intake opening 28 to the vacuum duct 10, the built-in fan 19 integrated into the filter drawer 73 can have a duct coupling 27 with a reversibly detachable drawer seal (not shown). The drawer seal can for example, interact with the bottom wall 59 or a sealing flange of the vacuum channel 10 attached thereto.

Based on the 14 A further embodiment is described. In contrast to the embodiments described above, the built-in fan 19 has a circular filter chamber 72. The filter chamber 72 includes an anti-tamper device in the form of perforated side walls, in particular with a hole structure. The connection surface 40 is curved, in particular circularly curved.

The built-in fan 19, in particular the fan impeller 22, is attached to the bottom wall 59 from below, in particular via the base space 53. In the radial direction to the fan axis 24, the fastening means 31, in particular the contact surface 57, extends no further than the fan impeller 22, the connecting means 26, and the filter chamber 72. The intake flange 27 penetrates the fan recess 58 of the bottom wall 59.

The built-in fan 19 has a filter change chamber 79. The filter 62 can be reversibly removed from the connection means 26, in particular from the filter chamber 72, through the filter change chamber 79. For the airtight closure of the filter change chamber 79, in particular a removal opening 70, the built-in fan 19 has a chamber cover 80. The chamber cover 80 is designed as a flap articulated to the filter change chamber 79. The chamber cover 80 can have a locking element, in particular a locking lug or a locking recess, for locking in a closed position. The chamber cover 80 can have an actuating means, in particular a handle, in particular a recessed grip, for manual displacement between the closed position and an open position.

The removal opening 70 can be arranged in a recess of the baseboard 67 of the kitchen base cabinet 5. The filter cover 71 can be arranged on the baseboard 67.

Alternatively, the removal opening can be arranged behind the baseboard 67. In particular, for removing the filter 62, the baseboard 67 can be reversibly and detachably attached to the kitchen cabinet 5.

The functioning of the built-in fan 19 corresponds to the functioning of the built-in fans 19 according to the embodiments described above.

Based on the 15 A built-in fan 19 according to a further embodiment is described. In contrast to the built-in fan 19 according to the embodiments described above, the built-in fan 19 has two connection means 26 with flat connection surfaces 40. The connection means 26, in particular the connection surfaces 40, are oriented at right angles to one another. In particular, the two connection means 26 form two adjacent side surfaces of a cuboid fan housing 25 in which the fan wheel 22 is arranged.

A duct coupling in the form of an intake flange 27 penetrates the base wall 59 of the kitchen base cabinet 5 in the area of a fan recess 58. The intake flange 27 is reversibly and detachably connected to the fan housing 25 by means of a bayonet lock. The built-in fan 19, in particular the fan housing 25 and the fan impeller 22 attached thereto, are attached to the base wall 59 from below, in particular via the base space 53.

Two rigid, cuboid-shaped filters 62 can be reversibly removed from the connecting means 26. The connecting means 26 has a filter guide 81, in particular a guide groove, for linearly guided removal and insertion of the respective filter 62. A filter chamber 72, which is at least partially delimited by the connecting means 26, is open to the environment in the region of a removal opening 70. A filter cover 71 for reversibly closing the removal opening 70 is not provided. The filters 62 can be removed from the built-in fan 19 via the base space 53.

In general, the kitchen base cabinet 5, in particular with the at least one cabinet wall 32a, 56, 59 and the base space 53 and the at least one built-in fan 19, form a cabinet system 82. The at least one built-in fan 19 can be detachably or permanently, in particular non-destructively detachable, connected to the kitchen base cabinet, in particular a cabinet wall 32a, 56, 59 and/or the drawer 73.

The design of the built-in fan 19 with the duct coupling 27 ensures an easily mountable and robust connection to the vacuum duct 10. The built-in fan 19 can thus be easily mounted in an installation position on the kitchen base cabinet 5, which can be arranged independently, in particular at a distance, from the inlet opening 11 and the cooktops 2. This allows an overall particularly space-saving arrangement of the built-in fan 19, the extractor hood 3, and the cooktop system 1. In particular, the installation space available in the kitchen base cabinet 5 can be largely retained as storage space. The design of the built-in fan 19 with the fastening means 31 simplifies installation on the kitchen base cabinet. The design of the built-in fan 19 with at least one filter holder reduces the number of required assembly steps and ensures a particularly compact design and arrangement of the built-in fan 19, the extractor fan 3, and thus the cooktop system 1. If the built-in fan is designed such that it protrudes at least partially into the fan recess 58 of a wall 32a, 56, 59 of the kitchen base cabinet 5, the built-in fan 19 can be arranged at least partially in the base space 53, resulting in an even more space-saving arrangement of the built-in fan 19 on the kitchen base cabinet 5.

Claims (15)

Built-in fan (19) for installation in a kitchen base cabinet (5) for an extractor fan (3) for extracting cooking fumes, comprising 1.1. a duct coupling for connecting to a flow duct (10, 10c) of the extractor fan (3) for extracting cooking fumes, 1.2. a fan wheel (22) for sucking in air through the duct coupling, 1.3. at least one fastening means (31) for fastening the built-in fan (19) to the kitchen base cabinet (5), and 1.4. at least one filter holder for reversibly receiving a filter (62) for cleaning the air, 1.5. wherein a connection surface (40) of the at least one filter holder, through which the filter (62) is supplied with the air to be filtered, surrounds a fan axis (24) of the fan wheel (22) over an angular range of at least 180°, and 1.6. wherein a minimum fan wheel distance (a _R ) between the connecting surface (40) and the fan wheel (22) is a maximum of 40% of the diameter (D) of the fan wheel (22). Built-in fan (19) according to Claim 1 , characterized in that the minimum fan wheel spacing (a _R ) is a maximum of 25% of the diameter (D) of the fan wheel (22). Built-in fan (19) according to Claim 1 or 2 , characterized by an immersion height (h _E ), by which the built-in fan (19) projects beyond a wall connection plane (32) of the fastening means (31) on a side opposite the fastening means (31), of at least 20 mm. Built-in fan (19) according to one of the preceding claims, characterized in that the at least one fastening means (31) is designed to fasten the built-in fan (19) to a bottom wall (59) of the kitchen base unit (5) and/or to a floor (78). Built-in fan (19) according to one of the preceding claims, characterized in that the connecting surface (40) is curved. Built-in fan (19) according to one of the preceding claims, characterized in that the at least one filter holder is designed for reversible removal of the filter (62) in a direction parallel to the fan axis (24) of the fan wheel (22). Built-in fan (19) according to one of the preceding claims, characterized in that the at least one filter holder has a removal opening (70) for removing the filter (62) which can be reversibly closed by means of a filter cover (71). Built-in fan (19) according to one of the preceding claims, characterized in that the at least one filter holder has a reversibly variable longitudinal dimension (l) with respect to at least one direction of extension. Built-in fan (19) according to one of the preceding claims, characterized by a filter drawer (73) with at least one filter holder. Built-in fan (19) according to one of the preceding Claims 3 until 9 , characterized in that the at least one fastening means (31) has a wall connection plane (32) for contacting a wall (32a, 56, 59) of the kitchen base unit (5), wherein the at least one fastening means (31) is designed such that the built-in fan (19) extends at least partially onto a side of the wall connection plane (32) opposite the at least one fastening means (31) in order to project into a fan recess (58) of the wall (32a, 56, 59). Built-in fan (19) according to Claim 10 , characterized in that the fan wheel (22) is arranged at least partially on a side of the wall connection plane (32) opposite the at least one fastening means (31). Built-in fan (19) according to Claim 10 or 11 , characterized in that an intake opening (28) and an exhaust opening of the built-in fan (19) are arranged on opposite sides of the wall connection plane (32). Cabinet system (82), comprising 13.1. at least one kitchen base cabinet (5) with 13.1.1 at least one wall (32a, 56, 59) and 13.1.2. a base space (53), and 13.2. at least one built-in fan (19) according to one of the Claims 1 until 12 . Cabinet system (82) according to Claim 13 , characterized in that a skirting board (67) of the kitchen base unit (5) has at least one filter (62) and/or at least one filter holder for reversibly receiving a filter (62). Hob system (1), comprising 15.1. at least one hob (2), and 15.2. an extractor device (3) for extracting cooking fumes downwards, with 15.2.1. at least one built-in fan (19) according to one of the Claims 1 until 12 .

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