EP3321601B1 - Wall box and fume hood system with a wall box - Google Patents

Description

The invention relates to a wall box for a ventilation system and an extractor system with a wall box. The invention also relates to the arrangement of a wall box in an outer wall of a building.

Wall boxes are used to ventilate buildings. Wall boxes are used in particular for the ventilation of kitchens by means of an extractor hood or for controlled living space ventilation. For example, a wall box is from the DE 10 2014 113 210 A1 and from GB 932 470 known. DE 87 13 390 U1 discloses a ventilation device under a double-glazed window for extracting exhaust air from rooms. Extractor hoods for the extraction of cooking fumes are for example in the DE 20 2007 000 610 U1 and the DE 20 2011 005 698 U1 described. It is an object of the invention to improve a wall box.

This object is achieved by a wall box with the features specified in claim 1.

It was recognized that suspensions and thereby defined pivot axes of flap arrangements can adversely affect an air flow through the wall box. The pivot axes are arranged outside of a flow area through which the air flow essentially flows. This improves the fluid dynamics of the air flow in the wall box. A flow resistance which the flap arrangements, in particular the suspensions, oppose to the air flow is reduced. Disturbing noises caused by the air flow when flowing around the flap arrangements are reduced. Furthermore, a pivot axis arranged outside the flow area advantageously ensures that no component of the associated flap arrangement located in the flow area is swiveled against the air flow. The air flow does not stand in the way of simple pivoting about the pivot axis. This improves the functionality and dynamics of the flap arrangements.

The wall box according to the invention has a housing which delimits an interior space encompassing the flow area. The housing has an inlet and an outlet through which air can flow in and out. The inlet and the outlet are fluid-dynamically connected to one another in one flow direction through the flow-through area. The interior space comprises at least two flap arrangements spaced apart in the flow direction, each with at least one flap arranged on a suspension. The flaps can be pivoted between a closed position and an open position about a pivot axis defined by the suspension. A drain is formed in a floor of the interior space. As a result, liquid located in the interior, in particular water condensed from vapors transported with the air flow, can flow out of the interior. A disadvantageous permanent effect of a liquid in the wall box, for example through mold formation, is consequently prevented.

The wall box is intended for installation in masonry. The masonry can in particular be an outer wall of a building. The wall box is installed in the masonry in such a way that the inlet and outlet of the wall box are arranged on different sides of the masonry. In particular, it can be provided to arrange the inlet on an inside of the masonry and the outlet on an outside of the masonry.

The flow direction is defined by the shortest connection from the inlet to the outlet. The direction of flow is particularly perpendicular to a cross-sectional area of the inlet. If the wall box is to be installed horizontally in the masonry, the direction of flow is in particular aligned horizontally, in particular parallel to a surface normal to the masonry.

In particular, a volume spanned by the cross-sectional area of the inlet and a length of the wall box in the flow direction can be defined as the flow area. In particular, the flow area has the shape of a general cylinder, the cross section of which corresponds to the cross section of the inlet. In general, the flow area can in particular be equal to the smallest convex envelope around the inlet and the outlet of the wall box or around the inlet and the smallest free flow cross-section in the interior of the wall box when the flaps are in the open position. The flow area is part of the interior of the wall box. When the flaps are in the open position, the air flow essentially only flows in the flow area.

The cross section of the inlet can have any shape. The shape of the cross section of the inlet can be designed essentially rectangular. The cross section of the inlet can in particular have the shape of a rectangle with rounded corners. Alternatively, the cross section of the inlet can also have a round, in particular oval or circular, shape. The shape of the cross section of the inlet preferably corresponds to the shape of the cross section of a ventilation pipe to be connected to the wall box, in particular a ventilation duct, in particular a flat duct. This improves the fluid dynamics of the air flow in the area of the inlet. Turbulence in the air flow in the area of the inlet is avoided.

The housing is preferably made of plastic, in particular of heat-resistant plastic. It can be essentially cuboid. The interior of the wall box can in principle have any cross-section. The cross section of the interior can vary along the direction of flow. The cross section of the interior is enlarged in the area of the flap arrangements compared to the cross section of the inlet and thus the flow area. The cross section of the outlet can differ from the cross section of the inlet. The cross section of the outlet can in particular be enlarged compared to the cross section of the inlet. The cross-sections of the inlet and outlet preferably have the same shape. This stabilizes the fluid dynamics of the air flow when the flaps are open in the entire wall box. Turbulence in the air flow along the direction of flow, in particular in the area of the outlet, is reduced.

Each of the flap assemblies may include a plurality of flaps. The flaps of a flap arrangement can in particular be arranged next to one another along a common pivot axis or opposite one another with respect to the cross-section of the interior space. However, it is preferably provided that each flap arrangement has exactly one flap. This ensures an uncomplicated construction of the wall box. In addition, the risk of catching when pivoting several flaps of a flap arrangement is avoided.

The individual flaps can be designed differently. Preferably, however, all the flaps are identical. In particular, the flap arrangements can be designed in the same way. As a result, the flaps can be manufactured inexpensively. The flaps are particularly preferably made in one piece. This enables functional and simple closability of the interior by means of the flaps. In particular, articulated connections and / or seals between individual flap parts can be dispensed with. It has proven to be particularly practical to design the flaps as flat plates. This ensures a space-saving and functional construction of the flaps.

The flaps each have an orientation. The orientation of a flap is defined as the alignment of a plane which is defined by edges of the respective flap that are parallel to the pivot axis and on the inlet side in the closed position. In the event that the flaps are designed as flat plates or are at least flat on the inlet side, their orientation can be defined as the orientation of a surface of the plate, in particular by the orientation of the inlet-side surface of the plate. The orientation of the flaps changes when the flaps are pivoted. The flaps have different orientations in the closed position and in the open position.

The suspension is arranged outside the flow area. The suspension is preferably arranged above the flow area. A pivoting of the flaps from the closed position into the open position thus takes place against a direction of gravity. This has the advantage that the flaps can pivot back from the open position into the closed position simply because of their weight.

In the closed position, the flaps seal the interior of the housing in the area of each of the at least two flap arrangements. The tightness of the wall box is improved in the closed position compared to a wall box with only one flap arrangement. In the closed position, a direct exchange of air between the inlet and the outlet is consequently prevented. In particular, the direct exchange of air between one is in the closed position Outside and an inside of a building prevented by the wall box. Due to the suppressed exchange of air, in the closed position of the flaps, an air cushion is created between the flap arrangements, which is defined by the distance between the flap arrangements in the direction of flow. The air cushion creates a simple and reliable thermal insulation between the inlet and the outlet of the wall box. In particular, the air cushion ensures thermal insulation between the inside and the outside of the building. This avoids a thermal bridge between the inlet and the outlet. Furthermore, the air cushion also provides sound insulation between the outlet and the inlet.

When the flaps are in the open position, there is a fluid connection between the inlet and the outlet, so that an air stream can flow through the wall box in the direction of flow. The air flow essentially flows through the flow area.

The flaps can be pivoted out of the closed position purely mechanically. The use of an electrical control of the flaps, for example, is avoided in this case. This has the advantage of a simple and fail-safe functioning of the wall box. The wall box is characterized by its currentless functionality. Fault-prone electric motors and / or pulling devices, in particular pulling devices between the electric motors and the flaps, are not required.

The mechanical pivotability of the flaps can be realized, for example, by springs arranged on the flap arrangements, in particular by loop springs or spiral springs in the area of the suspensions. Preferably, however, the flaps can be pivoted in a purely passive manner. This is understood to mean that the flaps can be pivoted out of the closed position solely on the basis of an air stream flowing in the direction of flow. The flaps can be pivoted in particular without the assistance of electrical and / or mechanical aids. This ensures a cost-effective construction of the wall box with a high level of failure safety at the same time.

In particular, it can be provided that the flaps can only be pivoted out of the closed position when a flow pressure of the air flow in the flow direction is a predetermined one Opening pressure exceeds. This ensures that the flaps are not pivoted out of the closed position when the flow pressure of the air flow in the flow direction is less than the opening pressure. In particular, the flaps can have the functionality of a check valve. This ensures that the wall box only allows air flows in the direction of flow. A flow of air against the direction of flow is reliably prevented.

It has proven to be practical if the opening pressure is between 15 Pa and 90 Pa, in particular between 50 Pa and 60 Pa. This prevents the flaps from opening unintentionally. At the same time, the maximum opening pressure of 90 Pa is low enough to avoid overloading a preceding ventilation system, in particular a fan.

According to one aspect of the invention, the distance between the pivot axes of two adjacent flap arrangements is at least large enough that the flaps of different flap arrangements do not overlap in the open position. In particular, an overlap between adjacent flap arrangements in the open position can be avoided. This prevents the flaps of two adjacent flap arrangements from hitting each other and / or snagging when they are pivoted from the closed position into the open position. The pivotability of the flaps is not restricted by an overlap between adjacent flap arrangements.

In particular, it is possible for at least one flap of the flap arrangement which is closest to the inlet in the direction of flow to be pivotable in such a way that the orientation of the flap is parallel to the direction of flow. If the wall box is to be installed horizontally, the orientation of a flap pivoted in this way is aligned horizontally. Preferably, all of the flaps can be pivoted into an orientation parallel to the direction of flow. This can in particular have the effect that the flaps are pivoted completely out of the flow area in the open position. The air flow can flow unhindered in the entire cross section of the flow area. The air flow is not adversely affected by the flap assemblies. Turbulence in the air flow through the flaps is avoided. This further improves the fluid dynamics of the air flow in the wall box. A flow resistance that the flap assemblies oppose to the air flow, is minimized. Disturbing noises caused by the air flow when flowing around the flap arrangements do not occur.

A large distance between adjacent flap arrangements also has the advantage of a large air cushion, so that the thermal insulation and the sound insulation of the wall box are further improved in the closed position.

According to a further aspect of the invention, at least one of the flaps has an insulation layer. The insulation layer further improves the thermal and / or acoustic insulation of the wall box. It is preferably provided that all flaps have an insulation layer. The insulation layer can in particular comprise a thermal insulation material with low thermal conductivity. Foam and / or fiber materials, for example, can be used as thermal insulation material. In a particularly practical embodiment of the flaps, the insulation layer is tight, in particular gas-tight, arranged inside the flaps. This avoids contamination of the insulation layer, for example from grease droplets in the air flowing through the wall box. Alternatively, the insulation layer can also be applied, in particular glued, to the flaps. It can also be provided here that the insulation layer is applied to the flaps in an exchangeable manner. In a further alternative, the insulation layer can also be implemented in that the flaps themselves are designed as hollow bodies. In this case, the hollow body can be filled with air. Alternatively, the hollow body can also be evacuated. As a further alternative, a vacuum plate can be applied, in particular glued, to the flaps.

According to one aspect of the invention, the suspensions are made of brass or plastic. This ensures a stable and inexpensive design of the suspensions.

The suspensions can be designed as ball bearings or slide bearings. The suspension counteracts the pivoting of the flaps with little friction.

The suspensions are preferably designed as capsule-pin suspensions. Capsule-pin suspensions are structurally simple and inexpensive. The suspension is particular arranged on the edge of the flaps. A precise and fail-safe pivoting of the flaps is guaranteed.

The suspensions can be made of plastic or brass. This ensures a stable suspension. The flaps can in particular be polished or polished to a high gloss. The suspension counteracts the pivoting of the flaps with little friction. A capsule-pin suspension made of polished or highly polished plastic or brass ensures that the flaps can be swiveled easily without additional components having to be provided, as is the case with a ball bearing, for example. This further improves the functionality and reliability of the wall box. In addition, a low manufacturing tolerance of the suspensions is ensured.

According to a further aspect of the invention, the orientation of the flaps in the open position is defined by a stop. The stop can in particular be formed by the flaps resting against the housing. The stop is preferably formed by the suspension of the flaps and cooperates with a limiting element. A stop element can then also be used to mount the flap. This enables a structurally particularly simple and stable mounting of the flap. The stop can fix the orientation of the flaps in their open position, in particular parallel to the direction of flow. The stop prevents the flaps from fluttering in the open position. The open position is precisely defined by the stop.

According to a further aspect of the invention, in the closed position the flaps rest against projections protruding into the interior. The projections form stops for the respective flap in the closed position. As a result, the projections precisely define the closed position, and the closed position is prevented from swiveling over. A fluttering of the flap in the closed position is avoided. The projections can only protrude into the interior at individual points. However, it has proven to be particularly practical if the projections protrude into the interior along the entire circumference of the interior. A circumferential projection has the function of a sealing contour. This further improves the sealing of the interior space in the closed position of the flap.

The projection, on which at least one of the flaps of the flap arrangement, which is closest to the outlet in the flow direction, can also be formed directly through the circumference of the outlet.

According to a further aspect of the invention, circumferential sealing lips are arranged on at least one of the flaps and / or one of the projections. The sealing lips are preferably arranged on all flaps and / or all projections. This further improves the tightness of the wall box in the closed position of the flaps. Furthermore, the thermal insulation and / or the sound insulation of the wall box is improved.

According to a further aspect of the invention, one or more means for fixing at least one of the flaps in the closed position are provided. In particular, magnetic means can be involved here.

The magnetic means can for example be arranged on the flap and cooperate with a corresponding magnetic means which is arranged on the projection assigned to the flap and / or the border of the flow-through area. The magnetic means can be designed as magnetic platelets. Alternatively, one of the magnetic means can also be formed by a metallic surface. The magnetic means are preferably provided for fixing all the flaps in the closed position. The magnetic means fix the flaps in the closed position and avoid rattling and / or unwanted opening of the flaps in the closed position. In addition, the provision of the magnetic means has the advantage that an opening pressure required for pivoting the flaps can be precisely predefined by the selection of the magnetic means. By fixing the flaps in the closed position, the penetration of vermin through the wall box can also be prevented.

Permanent magnets have proven to be particularly suitable magnetic means. As an alternative to this, the magnetic means can also comprise electromagnets.

Unlocking the flaps can advantageously be coupled to the activity of a fan generating the air flow. In this case it can be ensured that the flaps can only be pivoted into the open position when there is an actively generated air flow. The means for fixing the flaps in the closed position, in particular the electromagnets, can in particular be connected to the fan or a control device thereof in a signal-transmitting manner.

According to a further aspect of the invention, the flaps are made of plastic. This enables the flaps to have a low dead weight. The dead weight of the flaps can be less than 100 g, in particular between 60 g and 40 g. This supports the purely passive pivotability of the flaps. In addition, the flaps can be manufactured inexpensively.

In order to further increase the pivotability of the flaps, the flaps can be balanced with respect to the respective pivot axis. The flaps can be balanced in such a way that a center of gravity of the flaps has a lever arm with respect to the respective pivot axis which is at most 25%, in particular at most 10%, in particular at most 1% of an extension of the flap measured perpendicular to the respective pivot axis. This ensures that the flaps can be pivoted with a low torque. In particular, it can be achieved that the flaps are always pivoted into a position with an orientation parallel to the direction of flow when an air flow in the direction of flow exceeds the opening pressure. Balancing can be achieved by arranging suitable counterweights, in particular above the pivot axis.

The drain is preferably formed in that the floor of the interior is inclined at least in some areas with respect to the horizontal and in the direction of the outlet by an angle γ. The angle γ can in particular be between 0.5 ° and 2 °, preferably approximately 1 °. Liquids can flow along the slope due to gravity and drain through the outlet. The inclination of the floor can be achieved, for example, in that the entire housing is installed inclined relative to the horizontal. Alternatively, the inclination can also be achieved by widening the

Housing are effected in the direction of flow. As an alternative or in addition to this, the floor can also rise to the sides of the interior space, so that a particularly V-shaped channel is created. Such a channel extends in the direction from the inlet to the outlet. It can advantageously be provided that the channel also extends through the projections protruding into the interior. As a result, the liquid can also run off over a projection. Particularly preferably, grooves extending through the projections are covered by the respective flaps in their closed position, whereby the tightness of the wall box is ensured in the closed position. The liquid can then flow out when the flaps are in the open position.

The channel can also have a different cross section. In particular, it can be U-shaped.

The channel can, in particular, strike the corresponding projection in each case in the outlet direction. A passage opening can be provided in the projection so that any liquid that may collect in the channel can run off. The passage opening in the projection is preferably arranged at the lowest point of the channel. The passage opening can have a cross section of less than 1 cm ² , in particular less than 0.3 cm ² , in particular less than 0.1 cm ² .

The passage opening can be closable. In particular, in the manner of a valve, it can only be permeable in one direction. In particular, it can be closed with the aid of a non-return valve.

According to a further aspect of the invention, the orientation of the flaps in the closed position is inclined by an angle β with respect to a direction of gravity. With the intended horizontal installation of the wall box, the angle β can be between 1 ° and 5 °, in particular between 2 ° and 4 °, in particular approximately 3 °. The angle β can be specified by a stop on the flaps in the closed position. The stop of the flaps can in particular be formed by the circumferential projections. Here, the projections are inclined against the direction of gravity along the circumference of the interior. Such a tendency to orientation of the flaps in the closed position means that the flaps are held in the closed position by their own weight.

According to a further aspect of the invention, the housing is surrounded by an insulation material. In principle, it is also possible for the housing itself to be made from the insulation material. The insulation material can comprise styrofoam. The insulation material prevents the formation of a thermal bridge between the wall box and the masonry. The thermal insulation of the wall box is further improved. The insulation material can be in the form of an insulation block. The outer shape of the insulation block can be selected independently of the shape of the housing. This makes it easier to position the wall box in masonry. In particular, the insulation block can also be cut to length. As a result, the insulation block can be adapted to a thickness of the masonry surrounding the wall box. For example, the insulation block can also be exchangeable, so that the insulation block can be selected as a function of an opening in the masonry. The insulation block has in particular the function of an adapter between a wall opening or a wall opening and the housing of the wall box. For example, the housing can be essentially cuboid and the wall opening can have a rounded, in particular round, cross section. This is particularly the case if the wall breakthrough was created subsequently by means of one or more overlapping core bores with a breakthrough drill.

To install the wall box in the masonry, provision can be made in particular to initially only insert the insulation block into an opening in the masonry. Alternatively, the insulation block can also be cast directly with concrete. For this purpose, the insulation block can additionally comprise break-out or additional webs which can be used subsequently and which are useful for this purpose. During the positioning and / or encapsulation of the insulation block, it is stabilized by the webs. After positioning and / or casting around the insulation block, the webs can optionally be broken out and the housing inserted into the insulation block. The insulation block thus ensures precise positioning and alignment of the housing in the wall box.

According to a further aspect of the invention, the wall box has a connection piece for connecting a ventilation pipe in the area of the inlet. The connection piece can in particular be designed for connection to a ventilation duct, in particular a flat duct system. It is particularly advantageous to provide various connecting pieces that are detachably connected to the wall box. This ensures that different connection pieces for different ventilation pipes can be connected to the wall box.

According to a further aspect of the invention, the flaps of different flap arrangements of the wall box can be coupled via a transmission. This enables a synchronized pivoting of the flaps from their closed position into the open position. In addition, the necessary opening pressure can be reduced with the aid of the gearbox. Finally, by means of the transmission, the flaps can be opened more quickly. Such a transmission can in particular be used to couple the flaps of an outlet-side flap arrangement (outlet-side flap) and an inlet-side flap arrangement (inlet-side flap). A transmission suitable for this can comprise a coupling rod, for example. One end of the coupling rod can be rotatably connected to the outlet-side flap. At an end opposite the outlet-side flap, the coupling rod can be coupled to the suspension of the inlet-side flap via one or more toothed wheels. The coupling rod is preferably also rotatably connected to the housing. This connection, which can be arranged between the end of the coupling rod assigned to the outlet-side flap and the end of the coupling rod assigned to the inlet-side flap, forms an axis of rotation for the coupling rod. Rotating the inlet-side flap arrangement can thus cause the coupling rod to pivot, the pivoting being transmitted to the outlet-side flap.

In addition, the transmission can comprise a pivot lever. The pivoting lever can be rotatably connected to the housing at one end and rotatably connected to the outlet-side flap at another end. In particular, another axis of rotation of the transmission is defined by the pivoting lever. This ensures a controlled pivoting of the outlet-side flap when the inlet-side flap is pivoted.

A transmission coupling two flap arrangements can also enable the flaps to pivot in opposite directions due to the air flow flowing in the direction of flow. For example, provision can be made for a flap on the outlet side to be pivoted into the wall box. In particular, the flaps of the coupled flap arrangements can axially overlap in their open position. This enables a compact design of the wall box. A flap on the outlet side preferably does not protrude from the outlet of the wall box in its open position.

A pivoting of flaps coupled by means of a gear mechanism can, according to a further aspect of the invention, also be supported by a spring element. In particular, the spring element can be pretensioned against its restoring force in the closed position of the flaps. This ensures that the flaps are pivoted from the closed position into the open position when the flow pressure of the air flow is low. It has proven to be advantageous if the spring element is connected to the transmission via the coupling rod. In particular, the spring element can be connected with a first end on the coupling rod with an end opposite the first end to the housing of the wall box.

Another object of the invention is to improve an extractor system.

The object is achieved by an extractor system with a wall box as described above. The advantages correspond to those of the wall box.

In addition to the wall box, the extractor system can include a fan and a ventilation pipe. In particular, it comprises an extractor hood or a downward extractor hood, which is also referred to as a downdraft fan. The fan can be, for example, a fan, in particular a radial fan and / or axial fan. The ventilation pipe can be a round pipe. The ventilation pipe is preferably in the form of a ventilation duct, in particular a flat duct.

Another object of the invention is to improve the arrangement of a wall box in an outer wall of a building.

The object is achieved by arranging the wall box as described above in an outer wall of a building. The advantages correspond to those of the wall box.

Further details, advantages and features of the invention emerge from the description of an exemplary embodiment on the basis of the figures, the drain according to the invention, formed in a floor of the interior of the wall box housing, not being shown in the figures.

Fig. 1

einen perspektivischen Längsschnitt durch einen Mauerkastens mit zwei Klappenanordnungen, deren Klappen in einer Offenstellung gezeigt sind,

Fig. 2

ein Längsschnitt durch einen Mauerkasten mit zwei Klappen-anordnungen, deren Klappen in einer Schließstellung gezeigt sind,

Fig. 3

eine Frontansicht einer Klappenanordnung mit einer zugehörigen Klappe und Aufhängung,

Fig. 4

eine Seitenansicht der Klappenanordnung gemäß Fig. 3 ,

Fig. 5

eine Anordnung eines an ein Lüftungssystem angeschlossenen Mauerkastens in einer Außenwand eines Gebäudes,

Fig. 6

eine perspektivische Darstellung eines Isolationsblocks vor Einfügen eines Gehäuses,

Fig. 7

ein Längsschnitt durch ein Gehäuses mit zwei Klappenanordnungen, wovon die Klappe der einen Klappenanordnung in Offenstellung und die Klappe der anderen Klappenanordnung in Schließstellung gezeigt ist,

Fig. 8

eine Detailzeichnung einer Klappenanordnung in dem Gehäuse gemäß Fig. 7 in Offenstellung,

Fig. 9

eine Detailzeichnung einer Klappenanordnung in dem Gehäuse gemäß Fig. 7 in Schließstellung,

Fig. 10

ein Längsschnitt durch ein weiteres Ausführungsbeispiel eines Mauerkastens, dessen Klappen in der Schließstellung gezeigt sind,

Fig. 11

ein Längsschnitt durch eine alternative Ausführung eines Mauerkastens, wobei Details eines Getriebes zur Kopplung der Klappen gezeigt sind, und

Fig. 12

ein Längsschnitt durch den Mauerkasten gemäß Fig. 10 mit transparent dargestelltem Gehäuse, wobei die Klappen in Offenstellung gezeigt sind.

Show it:

Fig. 1

a perspective longitudinal section through a wall box with two flap arrangements, the flaps of which are shown in an open position,

Fig. 2

a longitudinal section through a wall box with two flap arrangements, the flaps of which are shown in a closed position,

Fig. 3

a front view of a flap assembly with an associated flap and suspension,

Fig. 4

a side view of the flap assembly according to Fig. 3 ,

Fig. 5

an arrangement of a wall box connected to a ventilation system in an outer wall of a building,

Fig. 6

a perspective view of an insulation block before inserting a housing,

Fig. 7

a longitudinal section through a housing with two flap arrangements, of which the flap of one flap arrangement is shown in the open position and the flap of the other flap arrangement is shown in the closed position,

Fig. 8

a detail drawing of a flap arrangement in the housing according to Fig. 7 in open position,

Fig. 9

a detail drawing of a flap arrangement in the housing according to Fig. 7 in closed position,

Fig. 10

a longitudinal section through a further embodiment of a wall box, the flaps of which are shown in the closed position,

Fig. 11

a longitudinal section through an alternative embodiment of a wall box, with details of a gear for coupling the flaps are shown, and

Fig. 12

a longitudinal section through the wall box according to Fig. 10 with the transparent housing, the flaps being shown in the open position.

In the following, with reference to the Fig. 1 and 2 an embodiment of a wall box 1 according to the invention described.

The wall box 1 comprises a housing 2 which is surrounded by an insulation material 3. The housing 2 is made of plastic, in particular of heat-resistant plastic. The insulation material 3 comprises, in particular, styrofoam. The insulation material 3 is designed as an insulation block. In the figures, the insulation block is shown with a cuboid shape. In principle, however, the insulation block can assume any shape and can in particular serve as an adapter between the housing 2 and a masonry 24. This ensures that the wall box 1 can be installed regardless of the specific shape of the wall opening and / or the wall opening. In particular, the insulation block can be adapted to a wall thickness of the masonry 24. The insulation block also simplifies the positioning of the wall box 1 in the masonry 24. The insulation material 3 also serves to avoid a thermal bridge between the masonry 24 and the housing 2 or the wall box 1.

The housing 2 is essentially cuboid. The housing 2 encloses an interior 25. The housing 2 has an inlet 4 and an outlet 5. In the present example, the interior space 25 has a cross section whose shape corresponds to a rectangle with rounded corners. Alternatively, the cross section of the interior could also have an angular or round shape. In principle, any shape of the cross section is also possible.

In the area of the inlet 4 there is a connecting piece 7 (cf. Fig. 2 ) intended for the connection of a ventilation pipe 8. In the exemplary embodiment shown, the connecting piece 7 is pushed into the housing 2 and locked therein. The connecting piece 7 is advantageously locked in the housing 2 in a detachable manner, in particular by means of a latching, plug-in or bayonet connection. The connection between the connecting piece 7 and the housing 2 is in particular tight, in particular liquid-tight. It can in particular be designed as a tongue and groove connection.

To seal the connection between the connection piece 7 or the ventilation pipe 8 and the housing 2, a seal, for example in the form of an O-ring, can also be provided.

The ventilation pipe 8 is part of a ventilation system. In the example shown, the ventilation pipe 8 is a flat duct. In principle, the connection 7 can also be designed for the connection of a ventilation pipe 8 with a shape deviating from the flat duct. It is particularly advantageous if the connection piece 7 is exchangeable so that ventilation pipes with different geometries can be connected to the wall box 1.

In the area of the outlet 5 is a screen 35 (see Fig. 2 ) intended. The cover 35 here covers the housing 2, the insulation layer 3 and a part of the masonry 24 surrounding the insulation layer 3. The wall box 1 fits into the appearance of the masonry 24 through the provision of the cover 35.

The shortest connection between inlet 4 and outlet 5 means that a flow direction 9 (cf. Fig. 2 ) Are defined. The direction of flow 9 is perpendicular to a cross-sectional area of the inlet 4. If the wall box 1 is to be installed horizontally in the masonry 24, the flow direction 9 is horizontal, in particular parallel to a surface normal 26 of the masonry 24 (cf. Fig 5 ), aligned.

The inlet 4 and the outlet 5 are connected by a flow-through area 6. The through-flow area 6 is defined as a volume spanned by the cross-sectional area of the inlet 4 and a length of the wall box 1 in the flow direction 9.

The wall box 1 comprises two flap arrangements 10, 11 spaced apart in the flow direction 9. The flap arrangement 10 is adjacent to the inlet 4 in the flow direction 9. The flap arrangement 11 is arranged adjacent to the outlet 5. In principle, it is also possible for more than two flap arrangements to be provided.

The flap arrangements 10, 11 each include a flap 12 which is arranged on a suspension 13. Alternatively, the flap arrangements 10, 11 can also comprise a plurality of flaps 12 with associated suspensions 13. However, it has been found to be advantageous if the flap arrangements 10, 11 each include exactly one flap 12.

The Figure 3 shows a front view of one of the flap arrangements 10, 11 with the associated flap 12 and a capsule 42 of the suspension 13. In FIG Figure 4 FIG. 11 is a side view of the flap assembly 10, 11 of FIG Figure 3 shown.

The flaps 12 are made of plastic. This enables the flaps 12 to have a low dead weight of less than 100 g, in particular between 60 g and 40 g. The suspensions 13 are designed as a capsule-pin suspension with the capsule 42 and a pin (not shown) on the sides of the flaps 12. In particular, they are made of highly polished plastic. Alternatively, the suspensions 13 can also be made of brass, in particular of polished or highly polished brass. The flaps 12 have an insulation layer 14 (cf. Fig. 1 and 2 ) on. The insulation layer 14 can in particular comprise a foam material or a fiber material. The insulation layer 14 is tightly, in particular gas-tight, arranged inside the flaps 12. This avoids contamination of the insulation layer 14, for example by fat droplets in the air flowing through the wall box 1. In an embodiment not shown, the insulation layer 14 can also be applied, in particular glued, to the flaps 12. Alternatively, it is also possible for the insulation layer 14 to be designed as a hollow body in the flaps 12.

All flaps 12 are identical and have the shape of a flat plate. The flaps 12 have an orientation 30 (cf. Fig. 1 and 2 ) defined by a surface of the planar plates forming the flaps 12.

The suspensions 13 create a horizontal pivot axis 27 (cf. in particular Fig. 3 ) defines around which the flaps 12 can be pivoted.

The pivot axes 27 are arranged above the flow area 6. This ensures that when the flaps 12 are pivoted from the closed position 15 into the open position 16 about the pivot axis 27, no part of the flap arrangements 10, 11 located in the flow area is moved counter to the flow direction 9.

The flaps 12 are pivoted purely mechanically. There are therefore no electric motors or other active actuation mechanisms for pivoting the flaps 12. The pivoting is preferably carried out purely passively, i.e. solely on the basis of an air stream 17 flowing in the flow direction 9 (cf. Fig. 1 ). In particular, it is provided that the flaps 12 are only pivoted from the closed position 15 into the open position 16 when the air flow 17 exceeds a predetermined opening pressure. The flaps 12 are in particular always in the closed position 15 when no air stream 17 is flowing (cf. Fig. 2 ) or the flow pressure of the air stream 17 is less than the opening pressure. The flaps 12 have the function of a non-return valve, so that an air flow from the outlet 5 to the inlet 4 causes the flaps 12 to close. An air flow against the flow direction 9 is therefore not possible.

It has proven to be practicable if the opening pressure is between 15 Pa and 90 Pa, in particular between 50 Pa and 60 Pa.

The pivotability of the flaps 12 is ensured by their low weight. This ensures that the flaps 12 can be pivoted with a low torque. This further ensures that the flaps 12 move completely from the closed position 15 into the position shown in FIG. 15 even at a flow pressure of the air flow 17 which only slightly exceeds the opening pressure Fig. 1 open position 16 shown are pivoted.

In an exemplary embodiment of the wall box (not shown), the flaps 12 are also balanced with respect to the respective pivot axis 27. The flaps 12 are balanced in such a way that a center of gravity of the flaps 12 has a lever arm with respect to the respective pivot axis 27, which is a maximum of 25%, in particular a maximum of 10%, in particular a maximum of 1% of an extension 23 measured perpendicular to the respective pivot axis 27 (cf. Fig. 3 ) of the flap 12 is. This can be accomplished, for example, by providing 13 counterweights above the suspensions.

A distance between the pivot axes 27 of the flap arrangements 10, 11 is at least large enough that the flap arrangements 10, 11 do not overlap in the flow direction 9 even when the flaps 12 are in the open position 16. In the case of an edge-side suspension 13 of the flaps 12, that is to say with an edge-side arrangement of the pivot axes 27, the distance between the pivot axes 27 of the flap arrangement 10 must therefore exceed a vertical extent 23 of the flap 12 of the flap arrangement 10. As a result, the flaps 12 of the flap arrangements 10, 11 cannot get caught during the pivoting.

In an alternative, not shown, of the wall box 1, more than two flap arrangements 10, 11 can be provided. In this case, it is advantageous if all the flap arrangements 10, 11 are designed in the same way and have a spacing from one another which exceeds the vertical extent 23 of the flaps 12.

At the in Fig. 1 The alternative shown are formed in the area of the flap arrangements 10, 11 along the edge of the interior 25 projections 18 which protrude into the interior. Circumferential sealing lips 19 are arranged on the projections 18. As an alternative or in addition, the sealing lips 19 can also be arranged on the flaps 12.

In the closed position 15, the flaps 12 rest against the projections 18 with the sealing lips 19. The flaps 12 close off the interior 25, in particular the flow-through area 6, tightly. In the closed position 15, a direct exchange of air between the inlet 4 and the outlet 5 is consequently prevented. In particular, in the closed position 15, the direct exchange of air through the wall box 1 between an outside 28 and an inside 29 (cf. Fig. 5 ) of the masonry 24 prevented. Due to the prevented direct air exchange occurs in the closed position 15 of the flaps 12 between the flap arrangements 10, 11 an air cushion which is defined by the distance between the flap arrangements 10, 11 in the flow direction 9. The air cushion prevents a thermal bridge between the outlet 5 and the inlet 4, in particular between the outside 28 and the inside 29 of the masonry 24. The thermal insulation is further reinforced by the insulation layer 14 of the flaps 12. In the closed position 15, a heat flow from inlet 4 to outlet 5 or from outlet 5 to inlet 4 is reduced. In addition to the thermal insulation, the air cushion and / or the insulation layer 14 effect sound insulation of the wall box 1.

The position of the flaps 12 in the closed position 15 is defined by the projections 18. With the intended horizontal installation of the wall box in the closed position 15, the orientation 30 of the flaps 12 is inclined in particular against a direction of gravity 20 by the angle β (cf. Fig. 2 ). The angle β is preferably selected in the range between 1 ° and 5 °, in particular in the range between 2 ° and 4 °, in particular approximately 3 °. As a result of the inclination of the orientation 30 of the flaps 12 in the closed position 15 by the angle β, the flaps 12 are pressed against the projections 18 due to their own weight. As a result, the tightness of the flap arrangements 10, 11 in the closed position 15 is increased.

Furthermore, magnetic means in the form of magnets 21 are provided in the area of the projections 18. The magnets 21 correspond to magnets 22 on the flaps 12 (cf. Figures 3 and 4 ). The magnets 21, 22 fix the flaps 12 in the closed position 15 on the projections 18. A rattling of the flaps 12 in the closed position 15 is thereby avoided. Unintentional or uncontrolled opening of the flaps 12 from the closed position 15 is also avoided. By fixing by means of the magnets 21, 22 there is also the possibility of precisely defining an opening pressure required for pivoting the flaps 12 from the closed position 15 into the open position 16. Alternatively, one of the magnetic means 21, 22 can also be formed by a metallic surface. Alternatively, other latching means could also be used to fix the flaps 12 in the closed position. The fixing of the flaps 12 prevents vermin from entering through the wall box.

In the embodiment shown here, the magnets 21, 22 are formed by permanent magnets. In an alternative not shown, the magnets 21, 22 are electromagnets.

If the flow pressure of the air flow 17 exceeds the opening pressure, the flaps 12 are pivoted from the closed position 15 into the open position 16.

In the open position 16, the orientation 30 of the flaps 12 is aligned parallel to the flow direction 9. The orientation 30 of the flaps 12 is determined by a stop 34 which is formed in the respective suspension 13.

In the open position 16, the flaps 12 are pivoted completely out of the flow-through area 6. In the open position 16, the flaps 12 release the entire flow area 6. This ensures that a flow resistance which the flap arrangements 10, 11 oppose to the air flow 17 is minimized. Noises which could be generated by flow around the flaps 12 are also avoided.

A floor 36 of the interior 25 is inclined at least in some areas with respect to the horizontal 37 towards the outlet 5 by the angle γ (cf. Fig. 2 ). The angle γ is in particular between 0.5 ° and 2 °, preferably approximately 1 °. This creates a drain for liquids located in the wall box 1. The inclination by the angle γ can be achieved in that the cross section of the interior space 25 widens in the flow direction 9. In an alternative not shown, the entire housing 2 is arranged in the insulation material 3 at an angle γ with respect to the horizontal.

In order to enable the drainage of a liquid also from an area of the wall box 1 located between the flap arrangements 10 and 11, it can be provided in an embodiment not shown to form a particularly V-shaped channel in this area in the bottom 36 of the interior space 25 . The channel extends in particular through the projection 18 of the flap arrangement 11, so that a drainage from the area located between the flap arrangements 10 and 11 in the direction of the outlet 5 is made possible. In the closed position 15 of the flaps 12, the channel is particularly advantageously covered in order to ensure the tightness of the wall box 1. In this case, a sequence is only possible in the open position 16 of the flaps 12.

In Fig. 5 an arrangement of the wall box 1 in the masonry 24 is shown. The masonry 24 can in particular be an outer wall of a building, so that the outside 28 is outside and the inside 29 is inside the building. The wall box 1 is part of an extractor system 31. The extractor system 31 comprises the ventilation pipe 8. The ventilation pipe 8 is preferably designed as a flat duct. The ventilation pipe 8 connects the wall box 1 to an inlet opening 32. The inlet opening 32 can be arranged in the area of a hob to draw off cooking vapors. The extractor system 31 comprises, in particular, a downward extractor 32, which is also referred to as a downdraft fan. The air flow 17 is generated by a fan 33. In the illustrated embodiment, the fan 33 is designed as a fan.

In the following, with reference to the detailed component drawings in Figures 6 to 9 further details of the positioning of the wall box 1 and the suspensions 13 are described.

In Figure 6 an insulation block 38 made of the insulation material 3 is shown. A housing 2 has not yet been inserted into the insulation block 38. The insulation block 38 is shown in a perspective in which the outlet-side end 65 faces the viewer. The insulation block 38 consists of an upper shell 39 and a lower shell 40 which are interlocked with one another. The upper shell 39 and the lower shell 40 of the insulation block 38 can thus be produced in a simple manner and connected to form the insulation block 38. Alternatively, it is also possible to form the insulation block 38 in one piece.

A housing 2 has not yet been inserted into the insulation block 38. To stabilize the insulation block 38, struts 41 which can be broken out are provided in the cavity provided for the housing 2. As an alternative or in addition to this, the struts 41 can be designed as a separate component and used in this to stabilize the insulation block 38. The insulation block 38 thus represents a robust unit that can be inserted into a wall opening or encased by concrete. The insulation block 38 can therefore be inserted into the masonry 24 before the housing 2 is inserted. After the intended positioning of the insulation block 38 in the masonry 24, the struts 41 can be broken out or removed again. In the cavity thus created, the housing 2 be inserted and thus the installation of the wall box 1 can be completed. The intended positioning of the housing 2 is thus predetermined by the insulation block 38.

In Figure 7 a longitudinal section through the housing 2 can be seen. Compared to the representations in Figure 1 and 2 the direction of flow is 9 in Figure 7 and thus the arrangement of the wall box 1 is mirrored. The direction of flow 9 runs in the illustration of FIG Figure 7 from right to left. In contrast to Figure 2 the longitudinal section runs in the Figure 7 not in the middle, that is, through the flaps 12, but through the side area of the flaps 12 at the level of the magnetic means 21. This allows details of the circumferential projections 18 of the sealing lips 19 and the magnetic means 21, 22 to be clearly seen. In addition, the Figure 7 the suspensions 13 arranged on the side of the flaps can be seen. To illustrate the function of the suspension 13, the flap 12 of the flap arrangement 10 is shown in the closed position 15 and the flap 12 of the flap arrangement 11 in the open position 16.

Figure 8 shows a detailed view of section VIII according to FIG Figure 7 . A flap 12 with a suspension 13 is shown. The flap 12 is shown in the open position 16 so that its orientation 30 runs parallel to the flow direction 9. The suspensions 13 are designed as capsule-pin suspensions. In the Figures 8 and 9 only the capsules 42, which are arranged non-rotatably on the sides of the flaps 12, are shown in each case. The capsule 42 is designed as a circular arc segment and forms a first stop 34 and a second stop 43. In the area of the suspension 13, in particular in the area of the capsule 42, a delimiting element 44 is arranged on the housing 2. In the open position 16, the stop 34 of the capsule 42 rests against the delimiting element 44. This defines the orientation 30 of the flap 12 in the open position 16. The open position 16 of the flap 12 is thus precisely defined. A rattling of the flap 12 in the open position 16 is prevented.

In Figure 9 is a detailed view of the section IX according to FIG Figure 7 shown. In Figure 9 the flap 12 is shown in the closed position 15. Their orientation 30 is inclined by the angle β against the direction of gravity 20. In the closed position 15, the flap 12 rests against the sealing lips 19 of the circumferential projections 18. In addition to this, the second stop 43 arranged in the capsule 42 of the suspension 13 cooperates with the limiting element 44. The second Stop 43 defines the orientation 30 of the flap 12 in the closed position 15 in addition to the circumferential projections 18 with the sealing lips 19.

That in the Figure 7 The housing 2 shown is not yet surrounded by an insulating material 3. In particular, the housing 2 is not yet in the insulation block 38, as shown in FIG Figure 6 is shown inserted. The housing 2 can be pushed into the insulation block 38 after the struts 41 have been broken out or removed. To lock the housing 2 in the insulation block 38, hook elements 45 are provided on the housing 2. The hook elements 45 interlock with the insulation material 3, in particular with the styrofoam, so that the housing 2 is securely held in the insulation block 38.

In the Figures 10 and 12th a second embodiment of a wall box 46 is shown. In Figure 11 a slightly modified embodiment of the wall box 46 is shown. Components that are used in connection with the wall box 1 according to Figures 1 to 9 have already been described bear the same reference numerals. Parts that are structurally different but functionally identical have the same reference numerals with an a after them.

In the case of the wall box 46, only the housing 2a is shown. In principle, the insulation material 3 or the insulation block 38 of the wall box 1 can be used for the wall box 46. The housing 2 opens up an interior space 25a. A flow-through region 6a is formed in the interior 25a. The bottom 36a of the interior 25a is inclined with respect to the horizontal, so that liquids located in the wall box flow in the direction of the outlet 5 and there via the closing openings 47 (cf. Figure 11 ) can flow away.

The wall box 46 has a flap arrangement 10a assigned to the inlet 4. The flap arrangement 10a comprises a flap 12a and a horizontally aligned suspension 13a which is arranged above the throughflow area 6a and which defines a pivot axis 27a. The flap 12a comprises an insulation layer 14a which is applied to the flap 12a as an insulation plate. In its closed position 15a, the flap 12a rests against a circumferential projection 18a formed by the inlet.

Furthermore, the wall box 46 comprises a second flap arrangement 48 which is assigned to the outlet 5. The second flap arrangement 48 comprises a flap 49 and a gear 50. In its closed position, the flap 49 rests against a projection 51 formed by the outlet 5. The orientations 30 of the flaps 12a and 49 of the wall box 46 are parallel to the direction of gravity 20 in the closed position.

The gear 50 comprises a pivoting lever 52 and a coupling rod 53. The pivoting lever 52 is rotatably connected at its one end to the upper edge of the flap 49 by means of a hinge 55. At an end of the pivot lever 52 opposite the hinge 55, the pivot lever is rotatably connected to a side wall of the housing 2a. The connection of the pivot lever 52 to the side wall of the housing 2a represents a first axis of rotation 54 of the gear 50. The pivot lever 52 defines a pivot radius of the hinge 55 and thus the upper edge of the flap 49 with respect to the first axis of rotation 54.

The one in the Figure 11 The design of the wall box shown differs from that of the Figure 10 only in the configuration of the pivot lever 52 and the coupling rod 53 and their relative position to one another.

The axis of rotation 54 is arranged approximately centrally in the flow direction 9 between the flap arrangement 10a and the flap 49. The axis of rotation 54 is also arranged at the level of a lower edge of the flap 12a, that is to say at a lower end of the throughflow region 6a. The axis of rotation 54 is arranged in particular such that its minimum distance from a ceiling 66 of the interior space 25a from the axis of rotation 54 exceeds a distance between the upper edge of the flap 49 and the axis of rotation 54. This enables the flap 49 to be pivoted into the interior 25a of the wall box 46.

The coupling rod 53 couples the pivoting of the flap 49 to the pivoting of the flap 12a. For this purpose, the coupling rod 53 is rotatably connected to a lower edge of the flap 49 by means of a hinge 56. At an end of the coupling rod 53 opposite the hinge 56, a set of teeth 57 is arranged. The coupling rod 53 is rotatably attached to the side wall of the housing 2a in the area of the teeth 57. The connection of the The coupling rod 53 with the side wall represents a second axis of rotation 61 of the gear 50. The teeth 57 are arranged opposite the hinge 56 with respect to the axis of rotation 61. The axis of rotation 61 is approximately halfway up a vertical extension 23a (cf. Fig. 11 ) of the flap 12a arranged. The axis of rotation 61 is also arranged adjacent to the flap arrangement 10a. The distance between the axis of rotation 61 and the flap arrangement 10a in the flow direction 9 essentially corresponds to a radius around the axis of rotation 61 assigned to the teeth 57.

The axis of rotation 61 is mounted in such a way that a distance between the lower edge of the flap 49 and the axis of rotation 61 is smaller than the distance between the projection 51 located above the outlet and the axis of rotation 61 25a of the wall box 46 allows the projection 51 past.

The teeth 57 mesh with teeth of a gear 58. The teeth of the gear wheel 58 in turn mesh with the teeth of a coupling element 59. The coupling element 59 is non-rotatably connected to the suspension 13a of the flap arrangement 10a.

An air stream flowing in the flow direction 9 in the ventilation pipe 8 causes the flap 12a to pivot from its closed position 15a into the open position 16a. Here, the coupling element 59 is rotated in a first direction of rotation A (cf. Figure 11 ). This leads to a rotation of the gear 58 in a second direction of rotation B opposite to the first direction of rotation A. This in turn rotates the teeth 57 of the coupling rod 53 in the first direction of rotation A about the second axis of rotation 61.

In the in Figures 10 and 11 The orientation of the wall box 46 shown corresponds to the first direction of rotation A clockwise. Correspondingly, a rotation in the second direction of rotation B runs counterclockwise.

The rotation of the teeth 57 in the first direction of rotation A is diverted via the coupling rod 53 into an upward movement of the lower edge of the flap 49 associated with the hinge 56 of the coupling rod 53. The movement of the lower edge of the flap 49 is also transmitted to that of the hinge 55 of the pivoting lever 52 of the flap 49. Due to the When the upper edge of the flap 49 is coupled to the pivoting lever 52, the movement of the hinge 55 is limited to a first circular arc 62. The first circular arc 62 is defined by a first radius, which corresponds to a distance between the first axis of rotation 54 and the hinge 55, and a first center point, which is defined by the first axis of rotation 55.

In the same way, a movement of the hinge 56 of the coupling rod 53 is restricted to a second circular arc 63. The second circular arc 63 is defined here by a second radius, which corresponds to a distance between the second axis of rotation 61 and the hinge 56, and a second center point, which coincides with the second axis of rotation 61.

A movement of the flap 49 caused by the pivoting of the flap 12a is determined by the fact that the hinge 55 and the hinge 56 run on the circular arcs 62 and 63, respectively. This also defines the displacement of the upper or lower edge of the flap 49. The flap 49 is therefore pivoted by the gear 50 from its closed position 15a into an open position 16a. Here, the flap 49 is displaced into the interior 25a of the housing 2a, so that the flap 49 in the in Figure 12 The open position 16a shown of the flaps 12a, 49 comes to lie above the flow area, in particular above the flap 12a. In the open position 16a, the orientation 30 of the flaps 49 and 12a is aligned parallel to the flow direction 9. In the open position 16a, the flaps 12a and 49 are pivoted out of the flow-through area 6a.

In order to facilitate pivoting of the flaps 12a and 49 due to the air flow 17, a spring element 64 is provided. The spring element 64 is connected with a first end to the coupling rod 53 in the area of the teeth 57 and is arranged with a second end opposite the first end in the bottom 36a of the housing 2a. The spring element 64 is biased against its restoring force in the closed position 15a of the flaps. The restoring force of the spring element 64 supports a pivoting of the flaps 12a and 49 from their closed position 15a to the open position 16a, in that the spring element 64 supports a rotation of the teeth 57 of the coupling rod 53 in the first direction of rotation A.

Claims (14)

1. Wall box (1) for a ventilation system, comprising

   1.1 a housing (2) bounding an interior space (25) and having

   1.1.1. an inlet (4) for an air flow, and

   1.1.2. an outlet (5) for an air flow,

   1.1.3. wherein a flow-through region (6) connects the inlet (4) and the outlet (5) in a flow direction (9), and

   1.2. wherein the interior space (25) comprises at least two flap arrangements (10, 11) spaced apart in the flow direction (9), each with at least one flap (12) arranged on a suspension (13),

   1.3. wherein each flap (12) is pivotable about a pivot axis (27) defined by the suspension (13) between a closed position (15) tightly closing the flow-through region (6) and an open position (16),

   1.4. wherein the pivot axes (27) are each horizontally aligned and arranged outside the flow-through region (6), and

   1.5. wherein the flaps (12) can be pivoted out of the closed position (15) in a purely mechanical manner,
   characterized in that

   1.6. a drain is configured in a bottom (36) of the interior space (25).
2. Wall box (1) according to claim 1, characterized in that a distance between the pivot axes of two adjacent flap arrangements (10, 11) is at least so large that the flaps (12) of different flap arrangements (10, 11) have no overlap in the flow direction (9) in the open position (16).
3. Wall box (1) according to any one of the preceding claims, characterized in that at least one of the flaps (12) has an insulation layer (14).
4. Wall box (1) according to any one of the preceding claims, characterized in that the suspensions (13) are made of brass or plastic material.
5. Wall box (1) according to any one of the preceding claims, characterized in that an orientation (30) of the flaps (12) in the open position (16) of the flaps (12) is determined by a stop (34).
6. Wall box (1) according to any one of the preceding claims, characterized in that in the closed position (15), the flaps (12) abut against projections (18) projecting into the interior space (25), wherein circumferential sealing lips (19) are arranged in particular on at least one of the flaps (12) and/or one of the projections (18).
7. Wall box (1) according to any one of the preceding claims, characterized in that the flaps (12) are balanced with respect to their respective pivot axis (27).
8. Wall box (1) according to any one of the preceding claims, characterized in that magnetic means (21, 22) are provided for fixing at least one of the flaps (12) in the closed position (15).
9. Wall box (1) according to any one of the preceding claims, characterized in that the flaps (12) are made of plastic material.
10. Wall box (1) according to any one of the preceding claims, characterized in that a bottom (36) of the interior space (25) is inclined at least in portions with respect to a horizontal line and in the direction of the outlet (5).
11. Wall box (1) according to any one of the preceding claims, characterized by an insulation material (3) surrounding the housing (2).
12. Wall box (1) according to any one of the preceding claims, characterized in that a connecting piece (7) for connecting a ventilation pipe (8) is arranged in the region of the inlet (4).
13. Fume extraction system (31) comprising a wall box (1) according to any one of claims 1 to 12.
14. Arrangement of a wall box (1) according to any one of claims 1 to 12 in an outer wall (24) of a building.

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