EP3409166B1 - Exhaust channel for a vacuum cleaner and vacuum cleaner comprising this exhaust channel - Google Patents

Description

Field of the Invention

The invention relates to a blow-out duct for a vacuum cleaner or a vacuum cleaner robot, comprising a first opening or recess for the entry of exhaust air, a second opening or recess for the exit of the exhaust air, and at least one wall which the first opening or recess with the second opening or recess connects, wherein the blow-out duct guides exhaust air from the first opening or recess to the second opening or recess.

Background of the Invention

From the U.S. patent application US 2005/0 138 756 A1 a vacuum cleaner is known in which numerous heat-emitting elements are cooled and at the same time a low device noise is to be achieved. For this purpose, a guide element is provided in order to transport part of the air that passes through the blow-out filter into the interior of the main body of the vacuum cleaner.

The international release WO 2010/040 523 A1 discloses a "Upright" type vacuum cleaner. To cool the batteries, an air flow generated by the blower is led past them. The airflow is then directed through a duct to an outlet opening. More vacuum cleaners are out US 6,052,863 A . US 2010 313 378 A1 and JP 2001 087 173 A known.

The document WO 2014/094834 A1 shows a blow-out duct for a vacuum cleaner according to the preamble of independent claim 1.

In order to achieve a high dust pick-up in vacuum cleaners and vacuum dust robots, you need, among other things, a large amount of air, which is drawn by a fan through the vacuum cleaner or by the vacuum cleaner robot per unit of time, and thus Sucks in dust. The amount of air per unit of time, the air flow, is impaired by noise-insulating materials in the blow-out area of the vacuum cleaner, since these insulating materials offer a flow resistance to the air flow. Due to their design, vacuum cleaner robots usually have a blow-out channel. The exhaust duct serves as a connection from the fan outlet to the device outlet. The air is transported through this and led out of the device through a discharge grille. Due to the deflections and the high speeds in the device, turbulence can occur in the duct, which, depending on the construction, can lead to disturbing noises. In addition, small blow-out ducts, which are often indispensable due to the small housing, lead to high flow resistances and thus generate unnecessary energy consumption. Another problem can be power electronics installed in the vacuum cleaner, because it can generate heat, which can lead to an increased temperature and heat build-up in the device. It is known to cool units of a vacuum cleaner with the intake air. However, the intake air is usually dust-laden. If electronic components are cooled, it can happen that dust accumulates on the units as the operating time progresses over the life cycle, thereby reducing the cooling effect of the intake flow.

Object of the invention

The invention has for its object to provide an improved blow-out channel for a vacuum cleaner or robot vacuum and an improved vacuum cleaner or robot vacuum. In particular, a vacuum cleaner or a vacuum cleaner robot is to be made available that enables noise reduction and / or has cooling of the units that is reliable over the life cycle.

Solution according to the invention

The reference symbols in all claims have no restrictive effect, but are merely intended to improve their legibility.

The object of the invention is achieved in that a third opening or

There is a recess for the exit of the exhaust air cleaned by an existing dust removal unit as a secondary outlet opening, through which exhaust air into the interior of the vacuum cleaner or the vacuum cleaner robot, e.g. B. for cooling units of the vacuum cleaner or the robot vacuum, flows, and / or the wall at least partially consists of an air-permeable material.

In the sense of the present invention, the wall is the part of the exhaust duct which neither forms the first opening for the entry of the exhaust air into the exhaust duct, nor the second opening for the exhaust air to exit the device. The first opening and / or the second opening can also each be formed from a plurality of openings, for example in the case of a grid-shaped exhaust air inlet and / or exhaust air outlet opening.

In order to be able to direct air to specific locations within the vacuum cleaner or the robot vacuum cleaner, it has proven to be advantageous if a third opening or recess for the outlet of the exhaust air is provided as a secondary outlet opening, through which exhaust air into the interior of the vacuum cleaner, e.g. B. flows for cooling units of the vacuum cleaner. This secondary outlet leads namely an exhaust air cleaned by a dust separation unit, which has a higher air quality in terms of particle freedom than intake air, which is unfiltered. Since the exhaust air has already been cleaned, there is no need for a separate filter arrangement for the air in order to remove dust from the air, which could be deposited on aggregates of the vacuum cleaner and so u. a. leads to reduced cooling of the units. Furthermore, this advantageously enables noise reduction to be achieved.

The third opening or recess should be dimensioned as a secondary outlet opening, so that the smaller part of the exhaust air flows through the third opening or recess. For this purpose it can be provided that the third opening or recess is dimensioned such that the air flow ratio between the third opening or recess to the second opening or recess is selected from the group of approx. 2:98, approx. 5:95, approx. 10 : 90, approx. 15:85, approx. 20:80, approx. 25:75.

The air permeability of the material, for example an artificial foam or a knitted fabric or fleece deep-drawn into the shape, can have a noise-reducing effect. Furthermore it can have the advantage that a certain exhaust air slip takes place in the housing of the vacuum cleaner or the vacuum cleaner robot. This exhaust air slip preferably cools heat-generating units within the vacuum cleaner or the vacuum cleaner robot. The flexibility makes it possible for the voluminous blow-out duct to adapt to the units located in the vacuum cleaner or in the vacuum cleaner robot or to avoid them during assembly. The vibration-damping effect of the material dampens resonance vibrations, which can lead to noise when undamped.

In one embodiment of the invention, the air which has entered the interior of the vacuum cleaner through the third opening or the air-permeable material cools one or more aggregates of the vacuum cleaner, particularly preferably one or more electrical or one or more electronic components. An electrical component can be a motor of the vacuum cleaner. In a preferred embodiment of the invention, however, the motor or another component in addition to the motor is not cooled, for example an electric accumulator of the vacuum cleaner or robot vacuum.

A vacuum cleaner in the sense of the present invention is a device which can generate a suction air flow which acts on an object, usually a surface, for example a floor surface, in order to pick up particles such as dirt or dust particles, but also liquids, from the object by being caught by the suction air flow and entrained (hereinafter also referred to as "suction"). A vacuum cleaner can advantageously achieve a cleaning effect in this way.

The vacuum cleaner is generally equipped with a suction blower for generating a suction air flow, a suction opening of the vacuum cleaner being in flow connection with the suction side of the suction blower. The suction opening is typically designed so that it over the object to be cleaned, for. B. a floor surface can be guided to the particles, for. B. dust or dirt. The suction fan is usually in flow connection with at least one dust separation unit, for example a, usually exchangeable, dust filter bag, a filter device or a centrifugal separator. Dirt particles absorbed by the suction air flow are in generally collected in a dust collection room, with a vacuum cleaner with a dust filter bag usually having the dust filter in the dust collection room.

A vacuum cleaner robot is a cleaning robot equipped with a vacuum cleaner. A cleaning robot is a cleaning device that is able to move automatically relative to a surface to be cleaned or to an object to be cleaned and to completely or partially clean the surface or the object. For this purpose, the cleaning robot is equipped with one or more cleaning devices. For example, the cleaning robot can be equipped with stationary or driven brushes, rollers, wipers, cloths or other cleaning devices. Alternatively or additionally, the cleaning robot can comprise a vacuum cleaner, for example a wet vacuum cleaner or a dry vacuum cleaner or a combined wet / dry vacuum cleaner.

A cleaning robot is usually equipped with a trolley. The undercarriage can be controlled, for example, by a controller that can be present in the cleaning robot or outside the cleaning robot. The controller uses data to control the undercarriage, which are provided by one or more sensors, which, at least in part, can be present in the cleaning robot or outside the cleaning robot. Typical sensors include a mechanical collision sensor, a camera, an ultrasonic sensor, an infrared sensor, a distance sensor, an acceleration sensor and a compass. A cleaning robot can comprise one or more mapping means or have a functional connection therewith. Mapping means include, in particular, devices for recording, storing or evaluating geometric properties of the space in which the cleaning robot works or is intended to work. The mapping means can advantageously contribute to a planned navigation of the cleaning robot in the room. Rooms can be exterior or interior spaces, e.g. B. interiors of buildings such as living quarters or household rooms.

A cleaning robot is usually battery operated. So that the battery of such a cleaning robot can be recharged after a cleaning phase, a charging station separate from the cleaning robot can be provided. The cleaning robot can be designed so that it can be used to charge the battery Charging station starts automatically and / or connects to the charging station independently.

The vacuum cleaner that the cleaning robot comprises can be designed, for example, as a wet vacuum cleaner, as a dry vacuum cleaner or as a combined wet / dry vacuum cleaner. For example, the cleaning robot can comprise a wet vacuum cleaner and can be designed to apply liquid to a surface to be cleaned or to an object to be cleaned and to vacuum the liquid again by means of the wet vacuum cleaner. In addition to the vacuum cleaner, the cleaning robot can comprise further cleaning devices such as brushes, rollers, wipers, cloths or other cleaning devices. The cleaning effect of the vacuum cleaner is preferably supported by these additional cleaning devices.

A cleaning robot that is equipped with a vacuum cleaner generally collects dirt and dust in a dust collector arranged in the cleaning robot. The space available on the cleaning robot is usually limited, so that the space provided for the dust collection container is also limited. In this respect, it is advantageous to provide a dust collection station to which dust and dirt from the dust collection container of the cleaning robot can be released from time to time. The cleaning robot can be designed in such a way that it automatically drives to the dust collecting station to discharge the dust and / or connects itself to the dust collecting station independently. The dust collecting station can be designed as a dust collecting station connected to a charging station or as a dust collecting station separated from a charging station.

Preferred embodiments of the invention

Advantageous training and further developments, which can be used individually or in combination with one another, are the subject of the dependent claims and the following description.

It can be provided that the third opening or recess for the exit of the exhaust air as an auxiliary outlet opening nevertheless has an air filter which blocks the exhaust air, the z. B. can be used for cooling, cleans. The exhaust air from the fan is one Vacuum cleaner or a robot vacuum cleaner already cleaned by dust filter. However, in order to filter out fine dust that could accumulate on statically charged electronic parts, the optional filter is provided, which protects the electronics against fine dust deposits.

In a preferred embodiment of the invention, it is provided that the parts of the wall thickness of the blow-out channel are increased only at those points where turbulence occurs due to the flow guidance, which depends on the shape of the blow-out channel. In other places, where the air flow is rather laminar and essentially parallel to the wall, the wall thickness can be smaller. Even the slight increase in area of the profile of the blow-out duct at the points where the exhaust air flows in a laminar manner and parallel to the wall produces a desired loss of flow resistance. Using common calculation models when designing the shape of the blow-out duct, it is already possible to determine, during the design by simulation, where turbulent flow conditions are present and where laminar flow conditions are present.

In order to achieve a particularly good sound-absorbing effect, the wall of the blow-out duct preferably consists at least partially of an air-permeable material, instead of the feature or in addition to the feature that a third opening or recess for the outlet of the exhaust air cleaned by an existing dust separation unit serves as a secondary outlet opening is present, through which exhaust air flows into the interior of the vacuum cleaner or the vacuum cleaner robot. The air-permeable material is preferably self-supporting, particularly preferably self-supporting and flexible. A particularly preferred air-permeable material has a vibration-damping effect. Preferably, the parts of the wall of the blow-out duct which are designed to be air-permeable, particularly preferably designed to be air-permeable in one of the aforementioned ways, delimit the blow-out duct towards the interior of the device. The parts of the blow-out channel which delimit the blow-out channel to the exterior of the device are preferably not air-permeable in one or more of the aforementioned ways, particularly preferably air-impermeable.

In order to also be able to use very light and loose materials, it can be provided be that a carrier made of plastic supports the wall on the side facing away from the exhaust air, the carrier made of plastic being at least partially broken. The openwork areas form passage points for the z. B. Desired exhaust air slip for cooling.

The blow-out channel can be constructed in such a way that it is designed as a shell, the blow-out channel for operation with the open side of the shell sitting on a housing wall of the vacuum cleaner. This structure makes it possible to deep-draw the blow-out channel, knitted fabrics being considered as deep-drawing material, which produce a certain exhaust air slip which, for. B. for cooling units of the vacuum cleaner or the robot vacuum cleaner is even desirable. The knitted fabric of the blow-out channel acts as an additional air filter due to the deep-drawn knitted fabric, which additionally cleans the exhaust air slip before entering the vacuum cleaner or the vacuum cleaner robot.

A preferred blow-out duct for a vacuum cleaner or a robot vacuum has a first opening or recess for the entry of exhaust air, a second opening or recess for the outlet of the exhaust air which has entered through the first opening or recess from the vacuum cleaner or robot vacuum, and at least one wall which is the first Connects opening or recess with the second opening or recess, wherein the blow-out duct guides exhaust air from the first opening or recess to the second opening or recess. The blow-out duct is particularly preferably designed as a shell, with a third opening or recess in the wall for the exit of the exhaust air that has entered through the first opening or recess and is cleaned by an existing dust removal unit, is provided as a secondary outlet opening, through which exhaust air into the interior of the vacuum cleaner or the Vacuum cleaner robot flows, and / or the wall consists at least partially of an air-permeable material through which exhaust air that has entered through the first opening or recess can flow from the blow-out channel into the interior of the vacuum cleaner or the vacuum cleaner robot.

To simplify the assembly of the blow-out channel, it can be provided that the edge of the shell of the blow-out channel has a plastic frame for mounting. The exhaust air duct preferably has flared edges with which the blow-out duct is received in the plastic frame.

Brief description of the drawings

Further advantageous embodiments are described in more detail below with reference to a number of exemplary embodiments illustrated in the drawings, to which the invention is not limited, however.

Fig. 1

eine Skizze zur Demonstration des Lufteintrittswegs und der Luftaustrittswege eines erfindungsgemäßen Ausblaskanals,

Fig. 2a

den Ausblaskanal aus Fig. 1 in einer perspektivischen Ansicht von oben, eingefasst in einen Kunststoffrahmen zur Montage,

Fig. 2b

den Ausblaskanal aus Fig. 1 in einer perspektivischen Ansicht von unten, eingefasst in einen Kunststoffrahmen zur Montage,

Fig. 3a

den Ausblaskanal aus Fig. 1 in einer perspektivischen Ansicht von oben,

Fig. 3b

den Ausblaskanal aus Fig. 1 in einer perspektivischen Ansicht von unten,

Fig. 4

eine Skizze zur Demonstration verschiedener Wandstärken des Ausblaskanals,

Fig. 5

einen erfindungsgemäßen Ausblaskanal, der an einen Teil einer Gehäusewand eines Staubsaugers montiert ist, und

Fig. 6

einen alternativen Ausblaskanal mit einem stabilisierenden Träger.

It shows schematically:

Fig. 1

a sketch to demonstrate the air inlet path and the air outlet paths of a blow-out duct according to the invention,

Fig. 2a

the exhaust duct Fig. 1 in a perspective view from above, enclosed in a plastic frame for assembly,

Fig. 2b

the exhaust duct Fig. 1 in a perspective view from below, enclosed in a plastic frame for assembly,

Fig. 3a

the exhaust duct Fig. 1 in a perspective view from above,

Fig. 3b

the exhaust duct Fig. 1 in a perspective view from below,

Fig. 4

a sketch to demonstrate different wall thicknesses of the blow-out duct,

Fig. 5

an exhaust duct according to the invention, which is mounted on part of a housing wall of a vacuum cleaner, and

Fig. 6

an alternative blow-out duct with a stabilizing support.

Detailed description of embodiments of the invention

In the following description of preferred embodiments of the In the present invention, identical reference symbols designate identical or comparable components.

In Figure 1 is sketched in a perspective view of the exhaust air path of exhaust air 3 of a vacuum cleaner or a vacuum cleaner robot with an exhaust duct 1 according to the invention. Exhaust air 3 passes through the opening 2 from a fan of the vacuum cleaner into the blow-out duct 1. For this purpose, it is provided that the wall 5 consists at least partially of an air-permeable material, the air-permeable material preferably being self-supporting, particularly preferably self-supporting and flexible and very particularly preferably self-supporting and flexible and having a vibration-damping effect. The self-supporting structure allows a vacuum cleaner robot, which must be very small and very light, to be built with a low weight. The material of the blow-out duct can also be flexible, so that the blow-out duct 1, which is voluminous in relation to other units of the vacuum cleaner, can also avoid other units or can be integrated into the narrow structure of a vacuum cleaner robot or a vacuum cleaner. If the material of the blow-out channel also has a vibration-damping effect, no noise is transmitted through the blow-out channel and the blow-out channel does not tend to form resonances which would negate the sound-absorbing effect. A material that is suitable for the construction of such a blow-out channel is a knitted fabric that is deep-drawn into the shape. The air permeability of a knitted fabric also has the advantage that the exhaust air from the blower flows through the air permeable knitted fabric into the vacuum cleaner or into the vacuum cleaner robot itself, and where appropriate cooling electronics cool. A certain slip of the exhaust air is therefore envisaged and quite desirable. The exhaust air from the blower has already been cleaned by the dust filter in the vacuum cleaner or in the vacuum cleaner robot and is therefore well suited for cooling. It is also possible to provide a further opening 7 or recess. In this case, a third opening 7 or recess for the outlet of the exhaust air is provided as a secondary outlet opening, through which exhaust air 3 into the interior of the vacuum cleaner z. B. flows for cooling units of the vacuum cleaner. For this purpose, it can be provided that the third opening 7 or recess for the exit of the exhaust air has an air filter as a secondary outlet opening, which the exhaust air z. B. also cleans for cooling. The third opening 7 or recess for the outlet of the exhaust air as a secondary outlet opening should not be dimensioned too large, since the exhaust air is largely rejected by being discharged to the outside shall be. It has proven to be advantageous if the third opening 7 or recess is dimensioned such that the air flow ratio between the third opening 7 or recess to the second opening 4 or recess is selected from the group of approx. 2: 98, approx. 5: 95, approx. 10: 90, approx. 15: 85, approx. 20: 80, approx. 25: 75. As a result, only a smaller proportion of the exhaust air 3 is used as air and only as much air flows into the vacuum cleaner or into it the vacuum cleaner robot as necessary so that very fine dust, which can also be present in the cleaned air, does not settle on the electronics and makes heat dissipation difficult, which can lead to overheating of the electronics.

It can be achieved with the invention that the blow-out duct 1 according to the invention, the wall 5 of which at least partially consists of an air-permeable material, enables a significant noise reduction compared to a conventional blow-out duct made of plastic. Above all, the higher frequencies, which are generated by turbulence and are noticeable through high whistling and hissing, are significantly reduced compared to the use of a plastic blow-out duct with a non-air-permeable plastic.

The blow-out duct 1 according to the invention is in the figures Figure 2a, Figure 2b, Figure 3a and Figure 3b presented in detail. Figure 2a shows the in Figure 1 Blown duct 1 shown in the isolated and removed state. This has an opening 2 shown in the lower left part of the illustration, into which a fan of the vacuum cleaner discharges exhaust air 3. The exhaust air 3 is diverted in the exhaust duct 1. Accordingly, turbulence is generated by diverting the flowing exhaust air, which can be noticed in the loud whistling and hissing. In order to minimize these very disturbing noises, it is provided that the wall thickness D1 of the first parts 5a of the wall 5 is greater where the turbulence occurs than the wall thickness D2 of the other parts 5b of the wall 5. The blow-out duct shown here has a shell-like construction and closes in the installed state with a housing wall of a vacuum cleaner, not shown here. For assembly, a plastic frame 8 is provided, which surrounds the blow-out duct 1 here and has mounting devices, here, for example, screw tabs, with which the blow-out duct can be screwed against the housing wall of the vacuum cleaner.

The blow-out device 1 is in Figure 2b shown in a perspective view from below, whereby the shell shape of the blow-out duct 1 can be seen. The edge of the shell is formed by the plastic frame 8, which is correspondingly different in width in accordance with the different wall thicknesses D1, D2 of the walls of the blow-out duct 1. The plastic frame is wider in the foreground because the exhaust air 3 of a blower is redirected at this point. There are whistling sounds and hissing noises that are picked up by an air-permeable material at the point.

Without the plastic frame 8 required for assembly, the outer appearance of the blow-out duct 1 changes only slightly, as shown in FIG Figure 3a is shown. The material of the walls 5a, 5b is exposed at the edge of the shell of the blow-out duct 1 and forms a flared edge with which the blow-out duct is fastened in the plastic frame. In Figure 3b it can finally be seen that the wall thickness D1 is smaller in the elongated positions of the blow-out duct 1 than in the foreground, where the wall 5b forms an arc for diverting the exhaust air.

The deflecting effect of the exhaust duct 1 is in Figure 4 outlined. In this sketch, a view of the open underside of the blow-out duct 1 is shown, with exhaust air 3 opening into the blow-out duct 1 from above through the opening 2 and being directed to the right through the arch of the part wall 5b. At this point, where the exhaust air bends, turbulence arises. The exhaust air does not flow in an ideal laminar flow, which does not generate any noise, but forms a large number of spatially small eddies and chaotic changes in the local air pressure, which is ultimately noticeable in the noise development. The adaptation of the wall thickness to the local noise development allows the blow-out duct 1 to form a cross-section that is as large as possible, so that the exhaust air duct does not unnecessarily have an excessively high flow resistance and at the same time insulate noise.

In Figure 5 A blow-out duct 1 according to the invention is shown, which is mounted on part of a housing wall of a vacuum cleaner. In the installed state, the blow-out duct 1 forms, together with the part of the housing wall of the vacuum cleaner, a closed duct into which the exhaust air of a fan flows through opening 2 and is passed through the blow-out duct 1 to an opening 2 as an outlet opening. The Blow-out duct 1 thus has a first opening 2 or recess for the entry of exhaust air 3, a second opening 4 or recess for the outlet of the exhaust air 3, and at least one wall 5 which connects the first opening 2 or recess with the second opening 4 or recess , The exhaust duct 1 guides exhaust air 3 from the first opening 2 or recess to the second opening 4 or recess. The exhaust air 3 flows according to the shape of the wall 5 and is deflected by first parts 5a of the wall, turbulence occurring in the exhaust air 3 and / or essentially laminar and parallel to other parts 5b of the wall 5. It is provided that the Wall thickness D1 of the first parts 5a of the wall 5 is greater where the turbulence arises than the wall thickness D2 of the other parts 5b of the wall 5. This has the advantage that the blow-out channel offers the lowest possible flow resistance and can therefore have a small size , which is advantageous for use in vacuum cleaner robots that have very little installation space.

An alternative blow-out channel is in Figure 6 shown, in which it is provided that a carrier 6 made of plastic supports the wall on the side facing away from the exhaust air, wherein the carrier 6 made of plastic is at least partially broken. The carrier made of plastic also allows foams or less tightly knitted fabrics to be used as blow-out channels, the supporting action of the plastic carrier maintaining the shape of the blow-out channel so that it cannot collapse and thus creates a high flow resistance. The carrier 6 made of plastic can be glued to the air-permeable material of the blow-out duct. However, it should be at least partially broken so that exhaust air can also pass through the air-permeable material, e.g. B. to cool aggregates of the vacuum cleaner. If the carrier is closed from plastic, the air can pass through the Figure 5 third opening 7 or recess shown flow as air.

The features disclosed in the above description, the claims and the drawings may be of importance both individually and in any combination for the implementation of the invention in its various embodiments.

LIST OF REFERENCE NUMBERS

1

blow-out

2

Opening / recess

3

exhaust

4

Opening / recess

5

wall

5a

Part of the wall

5b

Part of the wall

6

carrier

7

Opening / recess

8th

Plastic frame

D1

Wall thickness

D2

Wall thickness

Claims (11)

1. Exhaust channel (1) for a vacuum cleaner or a robotic vacuum cleaner, having a first opening (2) or cut-out for the entry of waste air (3), a second opening (4) or cut-out for discharging the waste air (3), and at least one wall (5), which connects the first opening (2) or cut-out to the second opening (4) or cut-out, wherein the exhaust channel (1) routes waste air (3) from the first opening (2) or cut-out to the second opening (4) or cut-out, characterised in that a third opening (7) or cut-out for discharging the waste air cleaned by a provided dust separation unit is provided as an additional outlet opening, through which waste air (3) flows into the interior of the vacuum cleaner or the robotic vacuum cleaner and/or the wall (5) consists at least partially of an air-permeable material.
2. Exhaust channel (1) according to claim 1, characterised in that the third opening (7) or cut-out for discharging waste air has an air filter, as an additional outlet opening, which cleans the waste air.
3. Exhaust channel (1) according to one of claims 1 or 2, characterised in that the third opening (7) or cut-out is dimensioned so that the air flow ratio between the third opening (7) or cut-out to the second opening (4) or cut-out is selected from the group of approx. 2: 98, approx. 5: 95, approx. 10: 90, approx. 15: 85, approx. 20: 80, approx. 25: 75.
4. Exhaust channel (1) according to one of claims 1 to 3, characterised in that the wall (5) consists at least partially of an air-permeable material.
5. Exhaust channel (1) according to one of claims 1 to 4, characterised in that a support (6) made from plastic supports the wall (5) on the side facing away from the waste air, wherein the support (6) made from plastic is at least partially perforated.
6. Exhaust channel (1) according to one of claims 1 to 5, characterised in that the waste air (3) flows in accordance with the shape of the wall (5) and in the process the waste air flow through first parts (5a) of the wall (5) forms turbulences, for instance by the waste air flow being deflected or because of an uneven wall shape, and the waste air flow flows essentially in a laminar manner in parallel to other parts (5b) of the wall (5), wherein the wall thickness (D1) of the first parts (5a) of the wall (5) is larger where the turbulences are produced than the wall thickness (D2) of the other parts (5b) of the wall (5).
7. Exhaust channel (1) according to one of claims 1 to 6, characterised in that this is embodied as a tray, wherein the exhaust channel, for operation with the open side of the tray, rests on a housing wall of the vacuum cleaner.
8. Exhaust channel (1) according to claim 7, characterised in that the tray edge of the exhaust channel has a plastic frame (8) for assembly.
9. Exhaust channel (1) according to one of claims 1 to 8, characterised in that this consists of a woven or nonwoven material which is deep-drawn in form or consists of a plastic foam.
10. Vacuum cleaner or robotic vacuum cleaner having a housing for receiving components, a nozzle for receiving dust-laden air, a fan for generating a flow of suction air, a dust separation unit arranged upstream of the fan, an exhaust channel (1) according to claim 1 to 9, which draws the cleaned suction air away from the fan and back out into the environment.
11. Vacuum cleaner according to claim 10, characterised in that it has at least one electric or electronic component, which generates waste heat during operation.

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