EP3557153A1 - Wall box and ventilation system with a wall box - Google Patents

Abstract

wobei K eine Fläche eines einhüllenden Kreises mit kleinstmöglichem Radius angibt, der den Querschnitt des Innenraums (9) vollständig verdeckt. Zumindest in einer Offenstellung weist die Klappe (23) der mindestens einen Klappenanordnung (20) eine Klappen-Kontur (29) auf, die in zu einer Schwenkachse (26) benachbarten Bereichen an eine Querschnitts-Kontur (16) des Innenraums (9) in dem jeweiligen zu der Schwenkachse (26) benachbarten Bereich angepasst ist.

A wall box (5) for a ventilation system comprises a housing (10) delimiting an interior space (9), in which a flow-through area (18) is defined. At least one flap arrangement (20) with a flap (23) arranged on a suspension is arranged in the interior space (9). For a surface A of a cross section of the interior (9) perpendicular to a flow direction (19) applies $$\mathrm{A}/\mathrm{K}>\mathrm{2}/\mathrm{\pi }.$$

where K indicates an area of an enveloping circle of the smallest possible radius completely covering the cross section of the interior space (9). At least in an open position, the flap (23) of the at least one flap arrangement (20) on a flap contour (29) in adjacent to a pivot axis (26) areas on a cross-sectional contour (16) of the interior (9) in is adapted to the respective region adjacent to the pivot axis (26).

Description

The present patent application takes the priority of the German patent application DE 10 2018 205 935.7 claim, the contents of which are incorporated herein by reference.

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

Wall boxes are used in particular in the venting of kitchens by means of a fume hood or controlled home ventilation. A wall box is for example from the DE 10 2014 113 210 A1 known. Extractors for extracting cooking fumes, 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 wallbox.

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

The wall box for a ventilation system has an interior limiting housing with an inlet for an air flow and an outlet for an air flow. A flow area connects the inlet and the outlet in a flow direction. In addition, the wall box has at least one flap arrangement with a flap arranged on a suspension, wherein the flap of the at least one flap arrangement is pivotable about a pivot axis defined by the suspension between a closed position sealingly closed by the flow area and an open position.

wobei K eine Fläche eines einhüllenden Kreises mit kleinstmöglichem Radius angibt, der den Querschnitt des Innenraums vollständig überdeckt. Die Klappe der mindestens einen Klappenanordnung weist zumindest in der Offenstellung eine Klappen-Kontur auf, die in zu der Schwenkachse benachbarten Bereichen an einer Querschnitt-Kontur des Innenraums in den jeweiligen zu der Schwenkachse benachbarten Bereichen angepasst ist.According to the invention, it has been recognized that a reduction of the flow resistance which the wall box in the open position of the flap of the at least one flap arrangement opposes to an air flow usually causes a disadvantageous enlargement of the outer dimensions of the wall box. In the present wall box, a low flow resistance is ensured at the same time with practical outer dimensions by the following features: For a surface A of a cross section of the interior space perpendicular to the flow direction applies $$\mathrm{A}/\mathrm{K}>\mathrm{2}/\mathrm{\pi }.$$

where K indicates an area of an enveloping circle of the smallest possible radius completely covering the cross section of the inner space. At least in the open position, the flap of the at least one flap arrangement has a flap contour, which is adapted in regions adjacent to the pivot axis on a cross-sectional contour of the interior in the respective regions adjacent to the pivot axis.

The invention particularly relates to the contouring of the flap, which leads to synergy effects in combination with the cross-sectional contour.

The wall box is intended for installation in masonry. The masonry may in particular be an outer wall of a building. The installation of the wall box in the masonry is such that the inlet and the outlet of the wall box are arranged on different sides of the masonry, in particular can be provided to arrange the inlet on an inner side of the masonry and the outlet on an outer side of the masonry.

The direction of flow is defined as the shortest connection from the inlet to the outlet. The flow direction is in particular perpendicular to a cross-sectional area of the inlet. When provided horizontal installation of the wall box in the masonry flow direction is particularly horizontal, in particular parallel to a surface normal of the masonry.

In particular, a volume defined by the cross-sectional area of the inlet and a length of the wall box in the flow direction can be defined as a flow-through area. The flow-through region has, in particular, the shape of a general cylinder whose cross-section corresponds to the cross-section of the inlet. In general, the flow-through area may 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 in the open position of the flap of the at least one flap arrangement. The flow area is part of the interior of the wall box. The air flow flows in the open position of the flap essentially only in the flow area.

gilt für einen quadratischen Querschnitt. Der Querschnitt des Innenraums weicht von einer einfachen, im Wesentlichen rechteckigen Form ab. Der Querschnitt weist bei gegebenem maximalem Durchmesser eine im Vergleich zu einem Rechteck vergrößerte Fläche A auf. Bei einem gegebenen maximalen Durchmesser des Innenraums, der mit maximalen Außenmaßen des Mauerkastens korrelieren kann, ist eine große Fläche A des Querschnitts des Innenraums gewährleistet, was eine bessere Entlüftung und einen niedrigeren Strömungswiderstand bewirkt. Bevorzugt gilt: A/K > 0,7, insbesondere A/K > 0,8, insbesondere A/K > 0,9, insbesondere A/ K > 0,95, insbesondere A/K > 0,975.The cross section of the interior can be constant or vary along the flow direction. In any case, the cross section satisfies the condition according to equation (1), wherein the exact value of A / K may vary. The enveloping circle covers the cross-sectional interior completely off. The area K of the enveloping circle therefore represents an upper limit for the area A of the cross-section of the interior. The area K of the circle thus represents the largest possible cross-sectional area for a given maximum diameter of the interior of the wall box . The condition $$\mathrm{A}/\mathrm{K}=\mathrm{2}/\mathrm{\pi }\approx \mathrm{0}.\mathrm{6367}$$

applies to a square cross section. The cross section of the interior deviates from a simple, substantially rectangular shape. For a given maximum diameter, the cross-section has an area A which is larger in comparison to a rectangle. With a given maximum diameter of the interior, which can correlate with maximum outside dimensions of the wall box, a large area A of the cross section of the interior is ensured, which causes better ventilation and a lower flow resistance. The following applies preferably: A / K> 0.7, in particular A / K> 0.8, in particular A / K> 0.9, in particular A / K> 0.95, in particular A / K> 0.975.

An outer contour of the housing may differ from the cross-sectional contour of the interior. Preferably, however, the outer contour of the housing substantially corresponds to the cross-sectional contour of the interior. For this purpose, the housing can have a constant wall thickness along the circumference of a housing cross section. This ensures small outer dimensions of the wall box relative to the area A of the cross section of the interior. One of the cross-sectional contour of the interior substantially corresponding outer contour of the housing also has the advantage that a surface of the outer contour of the housing enveloping circle is largely filled. Suitable wall thicknesses are for example between 1 mm and 30 mm, in particular they are at most 20 mm, in particular at most 10 mm, in particular at most 5 mm, preferably at about 2.5 mm.

A wall opening required for installation of the wall box in the masonry can thus be carried out in a simple manner with a core hole. The wall box is easy to install. In addition, the wall box fills a bore cross-section of the core hole, unlike a box-shaped wall box, as far as possible. It can therefore be provided based on the cross section of the interior, which is available for the vent, small wall breakthrough. For example, the diameter of the wall breakthrough exceeds the maximum diameter of the wall box by a maximum of 30%, in particular by a maximum of 25%, preferably by a maximum of 20%, particularly preferably by a maximum of 15%. The assembly The wall box is simple and effective. An elaborate fitting of the wall box in the wall breakthrough is avoided. In addition, the insulation costs for the insulation of the wall breakthrough is reduced.

A cross section of the inlet may have any 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, for example a ventilation duct, in particular a flat duct, or preferably a round duct. Particularly preferably, the cross section of the inlet substantially corresponds to the cross section of the interior. By adjusting the cross sections of the ventilation tube, the inlet and the interior of turbulence in the air flow are reduced, especially in the region of the inlet. The fluid dynamics of the air flow in the wall box is improved.

The cross section of the outlet may differ from the cross section of the inlet and / or the cross section of the interior. The cross-section of the outlet may in particular be increased in relation to the cross-section of the inlet. Preferably, the cross sections of the outlet and the inlet have the same shape. As a result, the fluid dynamics of the air flow in the open position of the flap of the at least one flap arrangement is stabilized in the entire wall box. Turbulences in the air flow along the flow direction, in particular in the region of the outlet, are reduced.

The at least one flap assembly may include a plurality of flaps. In this case, the flaps of a flap arrangement can in particular be arranged side by side along a common pivot axis or with respect to the cross section of the interior opposite. Preferably, however, the at least one flap arrangement has exactly one flap. This ensures an uncomplicated construction of the wall box. In addition, the risk of entanglement when pivoting a plurality of flaps of the at least one flap arrangement is avoided.

The flap of the at least one flap arrangement has a longitudinal direction. The longitudinal direction of the flap is defined as the direction perpendicular to the pivot axis in which the flap has the largest dimension measured perpendicular to the pivot axis. The longitudinal direction of the flap therefore corresponds to the largest perpendicular to the pivot axis extending diameter of the flap. The longitudinal direction is independent of a pivoting position of the rattle perpendicular to the pivot axis. In addition, the flap of the at least one flap arrangement an orientation on. The orientation is defined as the plane which is spanned by the longitudinal direction of the flap and a straight line running parallel to the pivot axis. The orientation of the flap changes with the pivoting of the flap. The flap has different orientations in the closed position and in the open position.

In the closed position, the flap closes the at least one flap arrangement and the flow-through area, in particular the entire interior of the housing in the region of the at least one flap arrangement tight, in particular gas-tight. In the closed position, a direct exchange of air between the inlet and the outlet is consistently prevented. In particular, in the closed position, the direct exchange of air between an outside and an inside of a building is prevented by the wall box. Thus, in particular an air flow against the flow direction, ie from the outlet to the inlet, prevented. In the closed position, the orientation of the flap and thus also its longitudinal direction can be substantially perpendicular to the flow direction.

In the open position of the flap, a fluid connection between the inlet and the outlet is given, so that an air flow in the wall box can flow in the flow direction. The air flow essentially flows through the flow area.

Due to the cross-sectional contour of the interior, which - as described above - deviates from a simple rectangular shape, a pivoting of the flap from the closed position, in particular from the Durchströmbereich addition, generally difficult. This is especially the case when exactly one flap per flap arrangement is present. In the wall box according to the invention, this problem is solved by the valve contour defined at least in the open position of the flap, which is adapted in regions adjacent to the pivot axis to the cross-sectional contour of the interior in the corresponding regions adjacent to the pivot axis. The adaptation of the flap contour means that the outer dimensions of the flap contour in the corresponding areas substantially correspond to the internal dimensions of the cross-sectional contour of the interior. In essence, this is to be understood in such a way that despite the adaptation of the external dimensions of the flap contour to the inner dimensions of the cross-sectional contour enough clearance is provided that a, in particular frictionless, pivoting of the flap is ensured from the closed position to the open position and back. The adaptation of the flap contour allows the flap can be easily pivoted from the closed position to the open position and back even in an interior deviating from a rectangular cross section. In particular, it is possible that the flap of the at least one flap arrangement is swung out as far as possible in the open position from the flow area. This prevents that the flap of the at least one flap arrangement in the open position comes to rest completely or substantially within the flow area. A flow resistance caused by the at least one flap arrangement, in particular the flap of the at least one flap arrangement, is reduced. This improves the fluid dynamics of the air flow in the wall box. Disturbing noises which the air flow causes when the flap of the at least one flap arrangement flows around are reduced. The flow resistance of the wall box in the open position is further reduced.

Since the cross-sectional contour of the interior deviates from a simple rectangular shape, the flap of the at least one flap arrangement, at least in the open position, does not have a simple flap contour, but a three-dimensional flap contour. In particular, the flap of the at least one flap arrangement is not flat or plate-shaped, at least in the open position. Due to the three-dimensional flap contour, the flap has an extension in a contour direction, at least in the open position. The contour direction is perpendicular to both the longitudinal direction of the flap and the pivot axis. The pivot axis, the longitudinal direction and the contour direction span an orthogonal coordinate system with respect to which the contour and shape of the flaps can be measured. This coordinate system is fixed with respect to the respective flap and is pivoted with the flap. In the open position, the extent of the flap contour in the direction of the contour direction can be, for example, at least 5%, in particular at least 10%, in particular at least 20%, in particular at least 30%, in particular at least 40%, preferably at least 45% of the maximum extent of the flap in the longitudinal direction.

In order to adapt the flap contour in the open position, the flap of the at least one flap arrangement can be flexible or articulated. For example, the flexible or articulated designed flap when pivoting in the open position, for example, pressed against the inside of the housing, so that this is done via an adaptation of the flap contour to the cross-sectional contour of the interior. Alternatively, in particular in the case of hinged flaps, an automatic pivoting of the flap parts relative to one another during pivoting into the open position can take place. Preferably, however, the flap is rigid or dimensionally stable. This means that the flap is permanently contoured, ie independent of a pivoting position of the flap. This increases the stability and durability of the flap as well as the reliability when opening and closing the flap. Also, the flap is easy and inexpensive to produce.

Preferably, the flap contour is adapted to the cross-sectional contour such that the flap of the at least one flap arrangement rests flush in the closed position on the cross-sectional contour, in particular flush along the entire cross-sectional contour. The sealing effect of the closed position is thus ensured regardless of projections, sealants and the like. Dispensing with protrusions to which the flaps could abut improves the flow characteristics. In addition, no dirt can accumulate behind the projections. For this purpose, the flap may have two contour wings extending in the contour direction. In addition, contoured edges can be formed on the flap, in particular rounded, so that despite the sealing effect there is sufficient play that the flap is simple, in particular friction-free, pivotable.

To increase the sealing effect, the flap edge-side sealing lips, in particular have a peripheral circumferential sealing lip. The sealing lips are preferably made integrally with other parts of the flap, in particular a flap body. The flap, in particular the flap base, is particularly preferably a two-component component. The sealing lips can be molded onto the valve body in the manufacture of the flap.

In addition or as an alternative to this, projections, in particular a projection which completely surrounds the cross-sectional contour, can be provided on which the flap rests in the closed position. The projections and / or the flap may have circumferential sealing lips to increase a sealing effect. In the case of several flap arrangements, one projection for the respective flap can be provided in each case.

According to one aspect of the invention, the cross-sectional contour of the interior has substantially the shape of a polygon, in particular a regular polygon, with at least five corners or a circle. Essentially, this means that, for example, the corners of the polygon can be rounded off and / or its edges can be inlaid. With regard to the circular shape, this means, in particular, that the cross-sectional contour can have, for example, flattened poles. Formally, the cross-sectional contour in the form of a circle corresponds to a cross-sectional contour in the form of a regular polygon with n vertices, where n → ∞. Such a cross-sectional contour fills the surface of the enveloping circle as far as possible to completely. Such cross-sectional contours have proven to be particularly advantageous because they correspond to common ventilation pipe cross-sectional contours. This ensures an optimized air flow from the ventilation pipe through the inlet through the interior to the outlet. For example, the ventilation pipe can be designed as a round tube with a diameter of 150 mm. In this case, the wall box may have a maximum outer diameter of 180 mm, preferably an outer diameter of about 175 mm.

In the case of a round cross-sectional contour, the flap contour, at least in the open position of the flap in areas adjacent to the pivot axis, may have rounded portions whose radius is adapted to the radius of the cross-sectional contour. This can be ensured, in particular, by contour wings, which have the shape of circular arc segments in a plane spanned by the pivot axis and the contour direction.

According to a further aspect of the invention, the flap of the at least one flap arrangement is made in one piece. One-piece here is understood to mean that the flap is integrally formed or consists of rigidly interconnected components. For example, the flap can be formed from various layers, such as a flap base body and an insulation layer attached thereto, in particular adhered thereto. The one-piece flap has in particular no different, relatively displaceable flap parts. The one-piece flap, in particular a flap base body with integrally molded sealing lip, completely covers the cross-section of the interior in the closed position. This allows a functional and easy closeability of the interior through the flap. In particular, can be dispensed with articulated joints and / or seals between individual flap parts. Particularly preferably, the flap of the at least one flap assembly is in one piece and dimensionally stable, that is, permanently contoured executed.

The pivoting of the flap of the at least one flap arrangement can be assisted by a motor. The motorized pivoting of the flap can in particular be coupled to the activation of a ventilation system, in particular a fan or a fan.

According to a further aspect of the invention, the flap of the at least one flap arrangement can be pivoted purely mechanically from the closed position into the open position. The usage an example of electrical control of the flap is avoided. This has the advantage of a simple and fail-safe operation of the wall box. The wall box is characterized by an electroless operation. Error-prone electric motors and / or tilting devices, in particular tilting devices between the electric motors and the flap, are not required.

The mechanical pivotability of the flap of the at least one flap arrangement can be realized, for example, by springs arranged on the at least one flap arrangement, in particular by wrap springs or coil springs in the region of the suspensions. Preferably, however, the flap of the at least one flap arrangement is pivotable in a purely passive manner. This is understood to mean that the flap can be pivoted from the closed position solely on the basis of an air flow flowing in the flow direction. The flap is in particular pivotable without support by electrical and / or mechanical aids. This ensures a cost-effective construction of the wall box at the same time high reliability.

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

It has proved to be practicable if the opening pressure is between 60 Pa and 90 Pa, in particular between 65 Pa and 75 Pa. As a result, unintentional opening of the flaps is avoided. The wall box fulfills the so-called "blower door test", which requires a tightness at a draft of 60 Pa. At the same time, the maximum opening pressure of 90 Pa is low enough to avoid overloading a previous ventilation system, in particular a blower.

Particularly preferably, the flap of the at least one flap assembly is also purely mechanically, in particular purely passive, pivotable, even from the open position into the closed position. This can be done for example due to gravity.

In the closed position, the center of gravity of the flap of the at least one flap arrangement can be displaced with respect to a surface formed by the pivot axis and the direction of gravity. This may be accompanied by the fact that the orientation of the flap of the at least one flap assembly is inclined in the closed position with respect to a direction of gravity by an angle. This can be realized in that the flap rests in the closed position on a projection. This ensures that the flap remains alone in the closed position due to its own weight.

According to a further aspect of the invention, the pivot axis of the at least one flap arrangement is aligned horizontally and arranged in an upper half of the cross section. The upper half of the cross section is in this case half of the cross section, which lies in the intended installation of the wall box with respect to the direction of gravity above the centroid of the cross section of the interior. By such an arrangement of the pivot axis, a pivoting back of the flap of the at least one flap arrangement from the open position into the closed position is possible solely on the basis of gravity. This ensures a simple and reliable purely passive pivoting of the flap of the at least one flap arrangement from the open position into the closed position, in particular as soon as the flow pressure of an air stream drops below the opening pressure. Preferably, the horizontally oriented pivot axis is arranged in the upper third of the cross section, particularly preferably in the upper quarter of the cross section.

Preferably, the flap of the at least one flap arrangement is balanced in relation to the pivot axis. This further increases the pivotability of the flap. The balancing of the flap can be effected such that a center of gravity of the flap with respect to the pivot axis has a lever arm which is at most 25%, in particular at most 10%, in particular at most 1% of a measured perpendicular to the respective pivot axis extension of the flap. This ensures that a pivoting of the flap with a low torque is possible. It can be achieved in particular that the flap is always pivoted into an open position with an orientation parallel to the flow direction when an air flow in the flow direction exceeds the opening pressure. The balancing can be effected, for example, by arranging suitable counterweights, in particular above the pivot axis.

According to a further aspect of the invention, the pivot axis of the at least one flap arrangement is arranged at an upper edge of the flow-through region or above. A pivot axis arranged at the upper edge of the flow-through region or above advantageously ensures that no component of the associated flap arrangement located in the flow-through region is pivoted against the air flow. The air flow is not opposed to a simple pivoting about the pivot axis. This improves the functionality and dynamics of the at least one flap assembly.

In particular, in the case of a pivot axis arranged above the through-flow region, the corresponding suspension is arranged outside the flow-through region. A negative influence on the air flow through the suspension of the at least one plate assembly is avoided. In this way, it can in particular be ensured that the flap of the at least one flap arrangement is swung out in the open position for the most part or completely out of the throughflow area. In contrast thereto, a pivot axis arranged within the cross section, in particular an arrangement of the pivot axis which divides the cross section vertically or horizontally uniformly, is always located in the flow area. Such arrangements of the pivot axis have a much higher, adverse flow resistance.

According to a further aspect of the invention, the flap of the at least one flap arrangement in the open position lies at least partially against the housing in the region adjacent to the pivot axis. The housing wall forms a stop for the flap in the open position. This allows a structurally particularly simple and stable mounting of the flap in the open position. The orientation of the flap in the open position is determined in particular parallel to the flow direction. The stop prevents flapping of the flap in the open position. The open position is precisely defined by the stop.

According to another aspect of the invention, there are at least two flow-spaced flap assemblies. It can also be provided more than two spaced-apart in the flow direction flap assemblies. In the closed position of the flaps of the at least two flap arrangements arises between the flaps an air cushion, which is defined by the distance of the flap assemblies in the flow direction. The air cushion provides a simple, inexpensive and reliable thermal insulation between the inlet and the outlet of the wall box. The air cushion ensures in particular a thermal insulation between the inside and the outside of the building. This will create a thermal bridge avoided between the inlet and the outlet. Furthermore, the air cushion also acts as a sound insulation between the inlet and the outlet.

The various flap arrangements, in particular the flaps of the various flap arrangements can be designed differently. For example, only the flap of a flap arrangement can have a flap contour which, at least in the open position, is adapted to the cross-sectional contour of the interior. Preferably, however, the flap assemblies and their flaps are made the same. Particularly preferably, all flaps are purely mechanical, in particular purely passive, from the closed position to the open position and swiveled back and / or made in one piece. The abovementioned features of the flap of the at least one flap arrangement are preferably realized in the same way for all flaps.

Particularly preferably, the flap of the at least one flap arrangement, in particular all flaps made of plastic. This allows a favorable production of the flaps. In addition, the flaps are robust and have a low weight. As a result, the pivotability of the flaps is improved. The flap contour can be easily and inexpensively produced by means of mass production with the known manufacturing methods for plastic components.

According to a further aspect of the invention, a distance of the pivot axes of two adjacent flap arrangements is at least so great that the flaps of different flap arrangements in the open position have no overlap in the flow direction. In particular, an overlapping of adjacent flap arrangements in the open position can be avoided. As a result, an adverse juxtaposition and / or hooking the flaps of two adjacent flap assemblies during pivoting from the closed position to the open position is avoided. The pivotability of the flaps is not limited by an overlap of the two flap arrangements.

In particular, it is possible for the at least one flap of the flap arrangement, which lies closest to the inlet in the flow direction, to be pivotable such that the orientation of the flap lies parallel to the flow direction. In the proposed horizontal installation of the wall box, the orientation of such a pivoted flap is aligned horizontally. Preferably, all flaps are pivotable in an orientation parallel to the flow direction. In this way, in particular, it can be effected that all the flaps in the open position are essentially swung out of the flow-through region. The airflow can flow unhindered in the entire cross section of the flow area. A flow resistance which the flap arrangements oppose to the air flow is minimized. The fluid dynamics of the air flow in the wall box is thereby further improved.

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

Particularly preferably, the distance between the pivot axes of two adjacent flap arrangements is just so great that the flaps of different flap arrangements in the open position have no overlap but only a minimum distance in the flow direction. This ensures the above-described advantages of spaced flap arrangements, with simultaneously small length of the wall box in the flow direction. The wall box can be installed even with low wall thickness.

In accordance with a further aspect of the invention, a flap arrangement of the at least one flap arrangement arranged adjacent to the outlet is arranged such that its flap projects out of the outlet in the open position.

A flap protruding from the outlet of the flap arrangement arranged adjacent to the outlet forms a roof in the open position. As a result, rain and / or dirt are shielded in the open position of the outlet. Ingress of rain and / or dirt into the interior of the wall box is avoided even with the flaps open. In the closed position, the flap of the flap arrangement arranged adjacent to the outlet is preferably arranged completely inside the interior. An accumulation of dirt or moisture on the flap is prevented in its closed position. The flap is also protected from wind in its closed position.

A protruding in the open position from the wall box flap further reduces the required for the functionality of the wall box length of the same. The wall box can have a small length in the flow direction.

The suspension of the at least one flap arrangement can be designed as a slide guide. Alternatively, the suspension of the at least one flap assembly as a ball bearing or Sliding bearing formed. Such suspensions counteract the pivoting of the flaps only a small amount of friction.

According to another aspect of the invention, the suspension of the at least one flap assembly is designed as a capsule-pin suspension. Preferably, the suspensions of all valve assemblies are designed as capsule-pin suspensions. Capsule-pin suspensions are structurally simple and inexpensive. Preferably, the pin is integral with the flap on its sides. The capsule may be integral with the housing, in particular as a bore in the housing. The suspension is stable and ensures a precise and fail-safe pivoting of the flaps.

Preferably, the suspension of the at least one flap assembly made of brass or plastic, more preferably made of highly polished brass or plastic. Particularly preferred all versions are made of plastic or brass. This ensures a stable suspension. The suspension may in particular be polished or highly polished. This ensures a low friction when pivoting the plates. A capsule-pin suspension made of polished, especially highly polished plastic or brass ensures easy pivoting of the flaps, without, as for example in a ball bearing, additional components must be provided. The functionality and reliability of the wall box is thereby further improved. In addition, a low manufacturing tolerance of the suspensions is ensured.

According to a further aspect of the invention, the flap of the at least one flap arrangement has an insulation layer. Preferably, all flaps each have an insulating layer. The insulation layer further improves the thermal and / or acoustic insulation of the wall box. The insulation layer may in particular comprise a thermal insulation material with low thermal conductivity. As a thermal insulation example, expanded polystyrene (EPS), foam and / or fiber materials can be used. In a particularly practical embodiment of the flaps, the insulating layer is tight, in particular arranged gas-tight within the flaps. As a result, contamination of the insulation layer, for example by fat droplets in the wall box flowing through the air, avoided. Alternatively, the insulating layer can also be applied to the flaps, in particular to a flap base body, in particular adhesively bonded. It can also be provided that the insulation layer is exchangeably applied to the plates. The flap of flap body and glued thereto insulating layer has a sandwich-like structure. In another Alternatively, the insulation layer can also be realized in that the valves themselves are designed as a hollow body. In this case, the hollow body may be filled with air. Alternatively, the hollow body may also be evacuated. As a further alternative, a vacuum plate can be applied to the flaps, in particular adhesively bonded. In a particularly preferred alternative, the flaps themselves are made of an insulating material. This ensures a structurally simple, cheap and fail-safe design of the flaps. In addition, the weight of the flaps is reduced, which increases their pivotability.

Preferably, the flaps have circumferential sealing lips, which terminate flush in the closed position on the cross-sectional contour. This further increases the tightness and the insulation effect.

According to a further aspect of the invention, the wall box has a connecting piece in the region of the inlet for connection to a ventilation system. The connecting piece can be designed in particular for connection to a ventilation pipe. Particularly advantageously, various connection pieces connected detachably to the wall box can be provided. This ensures that different connection pieces for different ventilation pipes can be connected to the wall box.

The housing is preferably made of plastic, in particular made of heat-resistant plastic. Furthermore, the housing may be surrounded by an insulating material. In principle, it is also possible to manufacture the housing itself from the insulating material. The insulation material may comprise polystyrene. 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 present as an insulation block. The outer shape of the insulation block can be chosen independently of the shape of the housing. As a result, a positioning of the wall box is facilitated in a masonry. For example, the insulation block can also be exchangeable, so that the insulation block can be selected depending on an opening of 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 the installation of the wall box in the masonry may be provided in particular, initially only use the insulation block in an opening of the masonry. Alternatively, the insulation block can be cast directly with concrete. For this purpose, the insulation block may additionally comprise breakable or additional, serving for this purpose, retrofittable webs. During positioning and / or overmolding the insulation block, this is stabilized by the webs. After positioning and / or pouring over the insulation block, the webs can optionally be broken out and the housing can be inserted into the insulation block. The insulation block thus ensures accurate positioning and alignment of the housing in the wall opening.

Furthermore, one or more means for fixing the flap of the at least one flap arrangement, in particular of all flaps, may be provided in the closed position. These may be, in particular, magnetic means.

The magnetic means may for example be arranged on the flap and cooperate with a corresponding magnetic means, which is arranged in the region of the housing wall. The magnetic means can be designed as magnetic plates. Alternatively, one of the magnetic means may also be formed by a metallic surface. The magnetic means fix the flaps in the closed position and avoid rattling and / or unintentional opening of the flaps in the closed position. In addition, the provision of the magnetic means has the advantage that a required for the pivoting of the flaps opening pressure can be precisely specified by the choice of the magnetic means. By fixing the flaps in the closed position, penetration of pests through the wall box can furthermore be prevented.

Particularly suitable magnetic means permanent magnets have been found. Alternatively, the magnetic means may also comprise electromagnets.

Advantageously, unlocking the flaps may be coupled to the activity of a fan generating the airflow. In this case, it can be ensured that the flaps are pivotable into the open position only with an actively generated air flow. The means for fixing the flaps in the closed position, in particular the electromagnets, may in particular be connected in a signal-transmitting manner to the fan or a control device thereof.

Furthermore, an outflow may be formed in the bottom of the interior. As a result, water that has condensed in the interior, in particular water condensed with vapors transported with the air flow, can flow out of the interior. A disadvantageous permanent action of a liquid in the wall box, for example by mold, is thus consistently prevented. For example, the drain can be formed by the bottom of the interior is at least partially inclined relative to the horizontal in the direction of the outlet. The angle may in particular be between 0.5 ° and 2 °, preferably about 1 °. Liquids may thus flow along the slope by gravity and drain through the outlet. An inclination of the floor can be achieved, for example, that the entire housing is installed inclined relative to the horizontal. Alternatively, the inclination can also be effected by a widening of the housing in the direction of the flow direction. Alternatively or additionally, the floor may also have a groove. Preferably, the channel is sealed in the closed position of the flap of the at least one flap assembly. This ensures tightness of the wall box. A drainage of the liquid can then take place in the open position of the flap of the at least one flap arrangement.

It is another object of the invention to improve a ventilation system.

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

The ventilation system may preferably be a fume extraction system, in particular a fume extraction system for a kitchen. The ventilation system can include a fan and a ventilation pipe next to the wall box. In particular, it comprises an extractor hood or an extractor hood downwards, which is also referred to as a tray ventilator. The fan may, for example, be a fan, in particular a radial fan and / or axial fan. The ventilation pipe can be a round tube. Preferably, the ventilation pipe is designed as a round tube with a diameter of 150 mm. Alternatively, the ventilation pipe is present as a ventilation duct, in particular as a flat duct.

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

The object is achieved by the arrangement of the wall box as described above in an outer wall of a building. The advantages result from those of the wall box.

For the arrangement of the wall box in the outer wall of the building is in particular provided to make a core hole through the outer wall. The diameter of the core hole is preferably by not more than 30 percent, in particular not more than 20 percent, in particular not more than 10 percent, preferably not more than 5 percent, more preferably not more than 2.5 percent, greater than the maximum outside diameter of the wall box. As a result, the installation of the wall box and in particular the same are improved. For example, a wall box having an outer diameter of the housing of 175 mm with the insulating layer as a whole have an outer diameter of 180 mm and be inserted into a corresponding core hole.

Fig. 1

eine schematische Darstellung eines Lüftungssystems mit einem in einer Außenwand angeordneten Mauerkasten,

Fig. 2

eine perspektivische Ansicht eines Ausführungsbeispiels eines Mauerkastens, wobei Klappen des Mauerkastens in einer Schließstellung dargestellt sind,

Fig. 3

einen Querschnitt durch den Mauerkasten gemäß Fig. 2,

Fig. 4

einen horizontalen Längsschnitt durch den Mauerkasten entlang einer Schnittkante IV-IV in Fig. 3,

Fig. 5

einen vertikalen Längsschnitt durch den Mauerkasten entlang einer Schnittkante V-V in Fig. 3,

Fig. 6

eine perspektivische Ansicht des Mauerkastens gemäß Fig. 2, wobei die Klappen in einer Offenstellung dargestellt sind,

Fig. 7

ein Querschnitt durch den Mauerkasten gemäß Fig. 6,

Fig. 8

eine Seitenansicht des Mauerkastens gemäß Fig. 6,

Fig. 9

einen vertikalen Längsschnitt durch den Mauerkasten entlang einer Schnittkante IX-IX in Fig. 7, und

Fig. 10

eine perspektivische Ansicht einer Klappe für den Mauer-kasten gemäß Fig. 2 bis 9.

Further details, advantages and features of the invention will become apparent from the description of an embodiment with reference to FIGS. Show it:

Fig. 1

a schematic representation of a ventilation system with a arranged in an outer wall wall box,

Fig. 2

a perspective view of an embodiment of a wall box, wherein flaps of the wall box are shown in a closed position,

Fig. 3

a cross section through the wall box according to Fig. 2 .

Fig. 4

a horizontal longitudinal section through the wall box along a cutting edge IV-IV in Fig. 3 .

Fig. 5

a vertical longitudinal section through the wall box along a cutting edge VV in Fig. 3 .

Fig. 6

a perspective view of the wall box according to Fig. 2 wherein the flaps are shown in an open position,

Fig. 7

a cross section through the wall box according to Fig. 6 .

Fig. 8

a side view of the wall box according to Fig. 6 .

Fig. 9

a vertical longitudinal section through the wall box along a cutting edge IX-IX in Fig. 7 , and

Fig. 10

a perspective view of a flap for the wall box according to Fig. 2 to 9 ,

In Fig. 1 schematically a ventilation system 1 is shown. The ventilation system 1 is used for venting a living space 2 of a building in an environment surrounding the building 3. For this purpose, the ventilation system 1 has a wall box 5 arranged in an outer wall 4 of the building.

The living room 2 may be, for example, a kitchen or a kitchen. The ventilation system 1 is a fume extraction system for extracting cooking fumes. It comprises an inlet opening 6 for the cooking fumes to be withdrawn. The inlet opening 6 is designed as a vapor extraction down, which is also referred to as a hollow fan formed. The inlet opening 6 is in fluid communication with a fan 7. The fan 7 generates the air flow required for the extraction of cooking fumes. The fan 7 is designed as a fan, in particular as a radial fan. Following the fan 7, a ventilation pipe 8 is arranged. The vent tube 8 provides fluid communication between the fan 7 and the wall box 5. The sucked from the living room 2 through the inlet opening 6 by means of the fan 7 air and the cooking fumes contained therein are passed through the vent pipe 8 and the wall box 5 in the environment 3.

With reference to the Fig. 2 to 10 In the following, an embodiment of the wall box 5 will be described in detail. The wall box 5 has an interior 9 limiting housing 10. The housing 10 has an inlet 11 for an air flow and an outlet 12 for an air flow. In the region of the inlet 11, a connecting piece 13 is arranged. Via the connecting piece 13, the ventilation pipe 8 is connected fluid-tight to the wall box 5. The connecting piece 13 is detachably connected to the housing 10, so that depending on the design of the ventilation tube 8 different connecting pieces 13 can be connected to the wall box. The connecting piece 13 serves as an adapter for connecting the ventilation pipe 8.

In the illustrated embodiment, the connecting piece is designed for a designed as a round tube vent pipe 8 with a diameter of 150 mm. A diameter 14 and cross section of the inlet 11 (see Fig. 4 . 5 . 7 or 9 ) correspond to the diameter or cross section of the ventilation tube 8. The diameter 14 of the inlet 11 is thus 150 mm. The inlet 11 has a circular cross-section. The housing 10 is substantially circular cylindrical. It has a maximum outer diameter of 175 mm.

The housing 10 is made of heat-resistant plastic. It has a constant wall thickness between 0.1 mm and 10 mm, in particular of about 2.5. mm up. Due to the constant wall thickness, the inner space 9 has the shape of a regular cylinder with a circular cross-section. A cross-sectional contour 16 of the inner space 9 therefore corresponds to the circumferential line of a circle with a cross-sectional diameter 17 (see FIG Fig. 7 ). An area A of the cross section of the inner space 9 therefore corresponds to the area of the circle with diameter 17 and circumference 16. By this design of the inner space 9 an optimal use of the space occupied by the wall box within a masonry of the outer wall 4 space is created. In particular, the cross section of the inner space 9 with respect to the outer dimensions of the wall box 5, in particular its outer diameter, is maximized.

In an alternative, not shown, projections 10 are integrally formed on the inside of the housing, against which the flaps 23 in its closed position. By the projections, the closed position is precisely defined. In addition, the isolation in the closed position of the flaps 23 is further improved by way of the projections, in particular by means of sealing lips arranged on the projections or the flaps 23. The projections may be made of solid material or in the form of an undercut. Alternatively, the flaps 23 may be pivotably mounted in the region of an expanded cross-section of the interior 9.

At the in Fig. 1 shown arrangement of the wall box 5 in the outer wall 4 of the building, the inlet 11 with the connecting piece 13 on a housing 2 facing the inside of the outer wall 4 and the outlet 12 is disposed on one of the environment 3 facing outside of the outer wall 4. When intended installation of the wall box 5 is aligned horizontally. This means that a central axis of the circular cylindrical housing 10 extends parallel to a surface normal 15 of the outer wall 4. Due to the circular cylindrical housing 10 of the wall box 5 whose arrangement in a masonry of the outer wall 4 is simplified. A wall opening required for insertion of the wall box 5 into the outer wall 4 can be made in a simple manner by means of a core hole with a circular drill cross-section. The diameter of the core hole can be adapted to the outer diameter of the wall box 5. The provision of a square wall breakthrough or partially overlapping core holes, as is necessary for inserting a square wall box, for example, is avoided. Particularly preferably, the wall box 5 is arranged in a core bore of larger diameter. In the space between the wall box 5 and the inner diameter of the core bore then an insulating material is arranged. By the Insulation material, the formation of a thermal bridge between the wall box 5 and the masonry of the outer wall 4 is avoided. This ensures good thermal insulation of the wall box 5.

Within the interior 9 of the wall box 5, a flow area 18 is defined. The flow-through region 18 connects the inlet 11 with the outlet 12 in a flow direction 19 (see FIG Fig. 4 . 5 . 7 or 9 ). The flow direction 19 is defined as the shortest connection from the inlet 11 to the outlet 12. In the inner space 9 designed as a regular cylinder, the flow direction 19 is perpendicular to the cross-sectional area of the inlet 11 and the cross-sectional area of the outlet 12. When the wall box 5 is mounted horizontally, the flow direction 19 is oriented horizontally. The flow direction 19 is thus parallel to both the central axis of the cylindrical housing 10 and to the surface normal 15 of the outer wall 4th

The flow-through area 18 is defined as a volume which is defined by the length of the wall box 5 in the flow direction 19 and the cross-sectional area of the inlet 11. The flow-through area 18 is therefore a cylindrical volume with a cross-sectional area corresponding to the cross-sectional area of the inlet. The cross-sectional area of the flow-through region 18 therefore also corresponds to the cross-sectional area of the ventilation tube 8. Turbulences are thereby effectively avoided.

Furthermore, the wall box 5 has an inlet-side flap arrangement 20 and an outlet-side flap arrangement 21. The flap assemblies 20, 21 are made equal. They each comprise exactly one flap 23 arranged on a suspension 22.

The flaps 23 are one-piece and dimensionally stable. They each have a non-explicitly shown flap body made of plastic. In addition, the flaps 23 each have an insulating layer not explicitly shown. The insulating layer is glued as an insulating material, such as foam or expanded polystyrene, on the flow-facing side of the flaps 23, so in its closed position on the inlet 11 side facing the flap body. In alternatives, not shown, the insulating layer is integrated into the flaps 23. In further alternatives, not shown, the flaps 23, the insulating layer can be realized as a vacuum or air inclusion within the flaps 23. In yet other alternatives, the flaps 23 are themselves made of insulating material. In some alternatives, the flaps 23 each have a circumferential sealing lip on. The sealing lip is molded as a soft component to the valve body. The flap body is a two-component component.

The suspensions 22 are realized as capsule-pin suspensions. The capsules 24 are designed as bores in the housing 10. The pins 25 are formed integrally with the flaps 23 (see in particular FIG Fig. 10 ). The pins 25 and the capsules 24 are highly polished, whereby a friction between the pins 25 and the capsules 24 is reduced. The suspensions 22 allow a simple pivoting of the flaps 23 about a defined by the respective suspension 22 pivot axis 26. The pivot axes 26 are perpendicular to the flow direction 19 and above the flow area 18 is arranged.

The flaps 23 each have a longitudinal direction 27. The longitudinal direction 27 is defined as the direction perpendicular to the pivot axis 26, in which the flap has the largest extent. The longitudinal direction 27 extends independently of a pivot position of the respective flap 23 perpendicular to the pivot axis 26. The plane spanned by the pivot axis 26 and the longitudinal direction 27 indicates an orientation of the flap 23. When pivoting the flap 23 about the pivot axis 26, the orientation of the flap 23 changes.

In addition, the flaps 23 have a contour direction 28. The contour direction 28 extends perpendicular to the pivot axis 26 and to the longitudinal direction 27. The pivot axis 26, the longitudinal direction 27 and the contour direction 28 span an orthogonal coordinate system, with respect to which the contour and shape of the flaps 23 is fixed. This coordinate system is fixed with respect to the respective flap 23 and is pivoted with the flap 23. The pivot axis 26 extends horizontally in the intended installation of the wall box 5.

The flaps 23 have a flap contour 29, which is essentially determined by the extent of the flap 23 in the directions defined by the pivot axis 26, the longitudinal direction 27 and the contour direction 28. The flap contour 29 will be described below in connection with the pivotability of the flaps 23 in detail.

The flaps 23 are about the pivot axis 26 between a in the FIGS. 2 to 5 shown closed position and one in the Fig. 6 to 9 shown open position pivoted.

In the closed position, an orientation of the flaps 23 is parallel to the cross-sectional area of the inlet 11 and the outlet 12, respectively Wall box 5 in the outer wall 4 extends the longitudinal direction 27 of the flaps 23 in the closed position parallel to a direction of gravity. The contour direction 28 of the flaps 23 runs parallel to the flow direction 19 in the closed position.

In the closed position, the flaps 23 close the entire interior space 9 and thus the flow-through area 18 in a gastight manner. In the closed position of the flaps 23, a fluid connection between the inlet 11 and the outlet 12 is interrupted. This ensures in particular that no air flow can flow from the outlet 12 in the direction of the inlet 11. The penetration of ambient air into the living space 2 is consistently prevented in the closed position of the flaps 23. In the closed position, an air cushion 30 is realized between the flap assemblies 20, 21 (see Fig. 4 and 5 ).

The pivot axes 26 of the flap assemblies 20, 21 have in the flow direction 19 a distance 34 which is greater than a maximum extent of the flaps 23 in the longitudinal direction 27 (see. Fig. 5 . 8th and 9 ). Due to the suppressed air exchange arises in the closed position of the flaps 23 between the flap assemblies 20, 21, an air cushion 30 whose extent substantially corresponds to the distance 34 of the pivot axes 26 of the flap assemblies 20, 21 in the flow direction 19. The air cushion 30 causes a simple and reliable insulation between the inlet 11 and the outlet 12 of the masonry 5. This ensures thermal insulation and sound insulation between the inside and outside of the outer wall 4 of the building. The insulation of the wall box 5 is effected in the closed position by the insulating layer of the flaps 23 and the air cushion 30.

In the open position, the flaps 23 are pivoted in the flow direction 19. In the open position, the orientation of the flaps 23 is perpendicular to a direction of gravity. This means that the longitudinal direction 27 of the flaps 23 runs parallel to the flow direction 19. Accordingly, the contour direction 28 is parallel to the direction of gravity.

In the open position, the flaps 23 are pivoted such that a fluid connection between the inlet 11 and the outlet 12 is provided. In the open position of the flaps 23, an air flow 33 (see Fig. 9 ) flow from the inlet 11 along the flow direction 19 over the flow area 18 to the outlet 12. In this case, the air flow 33 flows essentially within the flow-through region 18. The flaps 23 release the flow-through region substantially completely in the open position. The flap assemblies 20, 21 and their respective flaps 23 are pivoted out of the flow area 18 and produce no flow resistance against the flowing in the direction of flow 19 from the inlet 11 to the outlet 12 air flow 33. Due to the distance 34 of the pivot axes 26 of the flap assemblies 20, 21 ensures that the flaps 23 do not overlap in the open position. A hooking of the flaps 23 during pivoting from the closed position to the open position or from the open position to the closed position is avoided. In particular, the exhaust-side flap assembly 21 does not prevent complete pivoting of the inlet-side flap assembly 21.

The flap contour 29 allows a pivoting of the one-piece flaps 23 out of the flow area 18 and at the same time a gas-tight closing of the inner space 9 in the closed position. For this purpose, the flap contour 29 is adapted to the cross-sectional contour 16 of the interior 9. This is realized in that the maximum extent of the flaps 23 is adapted to the cross-sectional diameter 17 of the inner space 9 both in the longitudinal direction 27 and in a direction parallel to the pivot axis 26. In addition, a projection of the flap contour 29 on a plane formed from the pivot axis 26 and the longitudinal direction 27 has a circular shape (see. Fig. 3 ). In the closed position, the flap contour 29 rests flush against the housing 10 along the entire cross-sectional contour 16 of the interior 9. As a result, the closed position is well defined and prevents rattling of the flaps 23 in the closed position.

In addition, the flap contour 29 extends in regions adjacent to the pivot axis 26 along the contour direction 28. In these regions adjacent to the pivot axis 26, the flap contour 29 is along the contour direction 28 to the cross-sectional contour 16 of the interior adapted in the corresponding to the pivot axis 26 adjacent areas. This is realized in that the flaps 23 each have two contour wings 31. The contour wings 31 are arranged laterally of the pins 25 in the direction of the pivot axis 26. In a plane spanned by the pivot axis 26 and the contour direction 28, the contour wings 31 have the shape of circular arc segments (cf. Fig. 4 and 7 ). The radius of the circular arcs described by the contour wings 31 is dimensioned such that the contour wings 31 abut in the open position flush with adjacent to the pivot axis 26 areas of the housing 10. This means that the radius of the circular arcs described by the contour wings 31 essentially corresponds to the radius of the cross-sectional contour 16. The housing 10 forms a stop for the contour wings 31 and thus for the flaps 23 in the open position. Thus, the open position of the flaps 23 is precisely determined. A flutter and / or rattling of the flaps 23 in the open position is prevented. The contour wings 31 have an extent in the contour direction 28 which is greater than 40% of the maximum extent of the flaps 23 in the longitudinal direction 27.

In addition, the flaps 23 have circumferential contour edges 32 (cf. Fig. 6 . 8th and 10 ). The contour edges 32 are rounded so that a friction-free pivoting of the flaps 23 is ensured from the closed position to the open position and back.

In the in the Fig. 2 to 5 shown closed position, the flap 23 of the outlet-side flap assembly 21 is completely within the interior 9, that is, completely within the housing 10, respectively. In the in the Fig. 6 to 9 shown open position is the flap 23 of the outside flap assembly 21 beyond the outlet 12 of the housing 10 addition. By the flap 23 of the outer flap assembly 21, therefore, a 12 shielding the outlet is formed in the open position. It is thus prevented that rainwater can penetrate in the open position of the flaps 23 via the outlet 12 into the interior 9 of the wall box 5.

The mechanism for pivoting the flaps 23 will now be described. The flaps 23 pivot purely passive. So there are no electric motors and other active actuating mechanisms for the pivoting of the flaps 23 are provided. The flaps 23 pivot solely due to the air flow 33 generated by the fan 7. The flaps 23 are always in the closed position when no air flow 33 flows or a flow pressure of the air flow 33 is less than a predetermined opening pressure. As soon as the flow pressure of the air flow 33 exceeds the predetermined opening pressure, the flaps 23 pivot from the closed position into the open position. If the flow pressure of the air flow 33 falls below the opening pressure, the air flow 33 completely dies down or even an air flow flows counter to the flow direction 19, the flaps pivot purely passive from the open position into the closed position due to gravity. The flaps 23 have the function of a check valve, so that an air flow from the outlet 12 to the inlet 11 causes the flaps 23 to close. An air flow against the flow direction 19 is thus not possible.

A practical opening pressure is between 15 Pa and 90 Pa, in particular between 50 Pa and 60 Pa. This ensures that unintentional opening of the flaps 23 is avoided. At the same time an overload of the fan 7 is avoided.

The pivotability of the flaps 23 is ensured by their low weight and the low realized by the highly polished capsule-pin suspension 22 friction. This allows pivoting of the flaps 23 with a low torque. In addition, it is ensured that the flaps 23 are fully pivoted from the closed position to the open position even at a flow pressure of the air flow 33, which only slightly exceeds the opening pressure.

In further alternatives of the wall box, the pivoting of the flaps can be further supported by balancing the flaps 23 with respect to the pivot axes 26. The balancing of the flaps 23 takes place in such a way that a center of gravity of the flaps 23 with respect to the respective pivot axis 26 has a lever arm which is at most 25%, in particular at most 10%, in particular at most 1%, of an extension of the flaps 23 measured along the longitudinal direction 27. This can be accomplished, for example, by providing 22 counterweights above the suspensions.

wobei K eine Fläche eines einhüllenden Kreises mit kleinstmöglichen Radius angibt, der den Querschnitt des Innenraums vollständig überdeckt.In other alternatives, not shown, of the wall box, the housing has the shape of a regular cylinder with a non-circular base. For example, the footprint is a regular polygon with 5 or more corners. It can also oval bases or polygons be realized with rounded edges and corners. The housing may also have a varying cross-section along the flow direction. In all alternatives, however, applies to an area A of the cross section of the interior space perpendicular to the flow direction: $$\mathrm{A}/\mathrm{K}>\mathrm{2}/\mathrm{\pi }.$$

where K indicates an area of an enveloping circle of the smallest possible radius completely covering the cross section of the interior space.

In other alternatives, not shown, the flaps are flexible at least in the area of the contour wings. This means that the flaps can be plate-shaped in the closed position and be deformed in the open position by the concern of the housing, so that the flap contour is adapted to the cross-sectional contour. In yet other alternatives, contour wings are hingedly connected to the rest of the flap.

Claims (15)

Wall box (5) for a ventilation system (1), comprising 1.1 a an interior (9) limiting housing (10) with 1.1.1. an inlet (11) for an air flow, and 1.1.2. an outlet (12) for an airflow, 1.1.3. wherein a flow area (18) connects the inlet (11) and the outlet (12) in a flow direction (19), and 1.2. at least one flap arrangement (20, 21) with a flap (23) arranged on a suspension (22), 1.3. wherein the flap (23) of the at least one flap arrangement (20, 21) is pivotable about a pivot axis (26) defined by the suspension (22) between a closed position sealingly closed by the flow area (18) and an open position, 1.4. wherein for a surface A of a cross section of the inner space (9) perpendicular to the flow direction (19) applies $$\mathrm{A}/\mathrm{K}>\mathrm{2}/\mathrm{\pi }.$$

where K indicates an area of an enveloping circle with the smallest possible radius that completely covers the cross-section of the interior space (9), 1.5. wherein the flap (23) of the at least one flap arrangement (20, 21) has a flap contour (29) at least in the open position, which in areas adjacent to the pivot axis (26) adjoins a cross-sectional contour (16) of the interior space (9 ) is adapted in the respective regions adjacent to the pivot axis (26). A wall box (5) according to claim 1, characterized in that the cross-section of the interior (9) has substantially the shape of a polygon with at least five corners or a circle. Wall box (5) according to one of the preceding claims, characterized in that the flap (23) of the at least one flap arrangement (20, 21) is made in one piece. Wall box (5) according to one of the preceding claims, characterized in that the flap (23) of the at least one flap arrangement (20, 21) is purely mechanically pivotable from the closed position into the open position. Wallbox (5) according to one of the preceding claims, characterized in that the pivot axis (26) of the at least one flap arrangement (20, 21) is aligned horizontally and arranged in an upper half of the cross section of the inner space (9). Wallbox (5) according to claim 5, characterized in that the pivot axis (26) of the at least one flap arrangement (20, 21) is arranged on an upper edge of the flow-through area (18) or above. Wall box (5) according to one of the preceding claims, characterized in that the flap (23) of the at least one flap arrangement (20, 21) in the open position in the areas adjacent to the pivot axis (26) at least partially on the housing (10 ) is present. Wall box (5) according to one of the preceding claims, characterized by at least two in the flow direction (19) spaced flap assemblies (20, 21). Wall box (5) according to claim 8, characterized in that a distance of the pivot axes (26) of two adjacent flap assemblies (20, 21) is at least so great that the flaps (23) of different flap assemblies (20, 21) in the open position no overlap in the flow direction (19). Wallbox (5) according to any one of the preceding claims, characterized in that arranged adjacent to the outlet (12) flap assembly (21) of the at least one flap assembly (20, 21), is arranged such that the flap (23) in the open position protruding from the outlet (12). Wallbox (5) according to one of the preceding claims, characterized in that the suspension (22) of the at least one flap arrangement (20, 21) is designed as a capsule-pin suspension. Wall box (5) according to one of the preceding claims, characterized in that the flap (23) of the at least one flap arrangement (20, 21) has an insulating layer. Wall box (5) according to one of the preceding claims, characterized by a connecting piece (13) in the region of the inlet (11) for connection to a ventilation system (1). Ventilation system (1) with a wall box (5) according to one of claims 1 to 13. Arrangement of a wall box (5) according to one of claims 1 to 13 in an outer wall (4) of a building.

Images