EP2998663A2 - Closure assembly for an air canal and a corresponding assembly of a building - Google Patents

Abstract

The invention relates to a closure arrangement for an air duct, having a channel (1) and at least two closure elements (2) arranged in the channel (1), wherein the closure elements (2) between an open position in which the closure elements (2) have a cross section of Channel (1) release, and a closed position in which the closure elements (2) sealingly against an inner circumference of the channel (1) are pivotable, and wherein the closure elements (2) along the longitudinal axis (X) of the channel (1) and in an air flow direction (R) through the channel (1) are arranged spaced apart by a distance, so that in the closed position between the closure elements (2), a fluid-sealed space is formed. It is further described a corresponding building arrangement

Description

The invention relates to a closure arrangement for an air duct and a corresponding building arrangement.

The ventilation of buildings is often realized with the help of wall openings, in which optionally closable and openable wall boxes are used. In the simplest case, these wall boxes are closed by means of back pressure flaps, which automatically open during ventilation of the building due to the air flow occurring, or which can be moved by motor driven between a closed and an open position. A generic ventilation flap is from the DE 20 2010 003 340 U1 known.

From the DE 10 2007 0407 31 A1 a wall box is known in which a closure lid between an open position and a closed position driven by a pressure difference between the air pressure inside and outside the building against a self-adjusting mechanism provided by a restoring force automatically opens and closes.

The known wall boxes often have the disadvantage that they represent a thermal bridge between the building interior and the building environment. To solve this problem, it is from the DE 20 2006 006 327 U1 known to use in a wall box a motor displaceable between a closed and open position shutter which has an insulating body which has an outer contour which substantially corresponds to the inner contour of a ventilation duct. The adjusting mechanism is designed to displace the insulating body in a linear movement between the open and the closed position. The closure system is thus formed comparatively complex and in particular does not allow the automatic opening of the closure due to an incipient air flow, as generated for example by hoods for the removal of fumes.

It is therefore an object of the invention to provide a generic closure assembly for an air duct, which on the one hand provides effective heat insulation in the closed position of the closure assembly and on the other hand, the realization of embodiments allowed, in which the closure assemblies automatically opens due to an incipient air flow.

This object is achieved by a closure assembly with the features of claim 1. The dependent claims 2 to 15 relate to advantageous embodiments of the invention and the independent claim 16 a corresponding building arrangement using a closure arrangement according to the invention.

The closure arrangement according to the invention has a channel and at least two closure elements arranged therein, wherein the closure elements are pivotable between an open position in which they release a cross-section of the channel and a closed position in which they sealingly abut an inner circumference of the channel. The closure elements are arranged spaced along the longitudinal axis of the channel and in an air flow direction through the channel by a distance, so that in the closed position between the closure elements, a fluid-sealed space is formed.

The closure arrangement according to the invention thus makes use of the significantly lower thermal conductivity of air compared to most solids. The enclosed between each two adjacent closure elements air volume acts just like a thermal barrier. In principle, the closure arrangement according to the invention is not restricted to a specific number of the closure elements used. Already two closure elements are sufficient to form the thermal barrier according to the invention in the form of a closed volume of air. Investigations have shown, however, that closure arrangements can be realized on the basis of the teaching according to the invention, which already have a heat transfer value of only about 1 W / (m ² K) using three closure elements.

In one embodiment of the invention, the closure elements each have two flaps which have along their circumference a hinge side whose length corresponds to an inner dimension of the channel, and otherwise have a sealing contour which is adapted to a contour of the inner circumference of the channel. The flaps can be designed, for example, as one-sided hinged plastic flaps. If the channel is a round channel, can the flaps have substantially the shape of half a circular disc, wherein the straight side of the flap forms the hinge side.

In one embodiment of the invention, the two flaps of each closure element are arranged adjacent to each other with their hinge sides. This allows the flaps in the open position to assume a position in which they are folded on one another and extend along the longitudinal axis of the channel or parallel to it. Alternatively, in the open position, the flaps may also extend at an angle to the longitudinal axis of the channel. Basically, the position of the flaps in the open position should be selected according to the fact that the flaps in the open position represent the lowest possible flow resistance. This in turn depends on the geometry of the flaps. In principle, the flaps in the open position are to be arranged in such a way that they have the smallest possible cross-section in relation to the air flow flowing in the direction of air flow.

In one embodiment of the invention, the flaps have a dimension perpendicular to their respective hinge side, which is greater than the distance of the closure elements to each other, so that in the closed position in each case one of the flaps of a first closure element of the closure elements with one of the flaps of at least one further closure element of Closing elements overlap. It has been found that the volume of air trapped between the closure elements in the closed position of the closure arrangement in the longitudinal direction of the channel can only have a comparatively small dimension, which may for example also be smaller than the radius of a used circular channel.

In principle, the overlapping flap sections of the adjoining closure elements are to be arranged such that the closure arrangement forms as low a flow resistance as possible in the open position. For this purpose, it is provided in one embodiment of the invention that the flaps each have a step which extends spaced from the hinge side and parallel to the hinge side by the distance between the closure elements, so that the flaps lie in an overlapping region of the flaps and thus due their compact arrangement only have a very small cross section for the air flowing through the channel.

In order to achieve that the flaps are arranged as close to each other as possible in the open position and to largely suppress rattling of the flaps due to turbulence in the open position, is provided in one embodiment of the invention that the flaps at least a first of the closure elements, for example their side facing the hinge side having a spoiler having a raised portion via a step, which is arranged in the open position flaps in the overlapping region at a distance from a flap of another of the closure elements, which is arranged downstream of the first closure element is, so that the overlapping flaps are pressed against each other via an output of the flap having the spoiler, when the closure elements are flowed in the open position of an air flow.

In order to achieve an even higher thermal insulation in the closed position of the closure arrangement, it is provided in one embodiment of the invention that the flaps are designed as cavity profiles which have an enclosed gas volume. The flaps themselves can for example be made of a plastic material, in particular of a plastic material with a low coefficient of thermal conductivity, for example by injection molding.

In one embodiment of the invention, the adjoining hinge sides of the flaps of each closure element are interconnected via an airtight web, wherein the airtight web may comprise a spring-actuated return element which, in the open position of the flaps, provides a restoring moment in the closed position. The restoring element can be designed, for example, in the form of an elastic rubber spring element, in which the hinge sides of the flaps are inserted at opposite longitudinal grooves. If the flaps are flown by an air flow, the flaps move under bias of the return spring element in the open position. If the air flow stops, the flaps are moved back into the closed position due to the restoring moment of the preloaded spring element.

In one embodiment of the invention, the flaps have a curved contour with a convex outer side and a concave inner side. Especially if the flaps partially overlap adjacent closure elements in the open position, the above-described curved contour of the flaps has the advantage that the closure assembly forms only a low flow resistance.

In order to achieve a fluid-tight firing between the closure elements and the channel inner wall, in particular between the flaps of the closure elements and the channel inner wall, it is provided in one embodiment of the invention that the sealing contour comprises a compression seal, such as a rubber lip or a foam element, or a brush element, so that in the closed position between the inner circumference of the channel and the sealing contour, an impact gap is formed instead of an impact gap.

In yet another embodiment of the invention, the channel has an inner contour with varying diameter in the channel longitudinal direction, wherein the inner contour has chamfers along which the flaps are guided during their movement from the open position to the closed position with compression of the compression seal. The run-up slopes thus also have the function of forming a stop for the flaps in their movement between the open position and the closed position.

If the use of an adjusting drive on the movement of the closure elements between the open position and the closed position is provided, this can be realized according to an embodiment of the invention such that the adjustment acts on the flaps of the rearmost in the air flow direction closure element, wherein the overlapping flaps with each other via coupling elements coupled together. In this case, the adjusting drive can then be surrounded in the open position by the flaps of the rearmost element in the air flow direction, or be in the slipstream of the closure elements. Thus, the adjustment is not only aerodynamically arranged, but also effectively protected from contamination, such as those contained in the vapors of a cooker hood.

In one embodiment of the invention, in which the closure elements via an adjustment between the open position and the closed position are movable back and forth and in which the overlapping flaps are coupled together via coupling elements, it can be provided that the coupling elements as a coupling rod, a Coupling rod or a coupling thread are formed, or have such elements, which extends at an angle 0 ° < α <90 ° to the longitudinal axis of the channel and is thus connected at a different distance to the hinge sides with the overlapping flaps.

According to the invention, an embodiment is also provided, in which the closure arrangement is of modular design, in order to enable, at the discretion of the user and depending on a specific application situation, an efficient adaptability of the closure arrangement to the conditions encountered. It is provided that the channel is divided longitudinally into a plurality of channel sections which are releasably connected to each other, wherein in each of the channel sections of the closure elements is received. This embodiment makes it possible for any number of the channel sections with closure elements accommodated therein to be combined to form a closure arrangement according to the invention.

The closure arrangement according to the invention can in particular also be used for retrofitting in already existing exhaust air duct systems. It is often the case that an already found wall box in a wall breakthrough of a building wall has an air passage cross-section with a deviating from the standard geometry. For example, an inserted in the wall breakthrough channel due to its installation situation have rounding, which makes the installation of a closure assembly for standardized pipe cross-sectional geometries difficult.

In order to exert a high closing moment on the flaps in the closed position of the closure assembly and thus to avoid unintentional rattling of the flaps, is provided in one embodiment that the closure elements via an adjustment between the open position and the closed position are movable back and forth, wherein the adjustment Has at least one spring element which exerts a closing moment in the closed position on the closure elements. Preferably, the closing moment exerted by the spring element on the closure elements is degressive, increases in the direction of the closed position and is maximum in the closed position.

To further reduce the heat transfer coefficient (U-value) of the closure arrangement, it can be provided that the flaps of the closure element have a coating, foliation, or coating to reduce the transmission of heat radiation, for example an aluminum foil coating.

On the one hand to reduce the air passage resistance of the channel in the open position and on the other hand to protect the flaps of the closure assembly in the closed position against unwanted rattling, is provided in yet another embodiment that the channel has on its inner circumference per closure element has a circumferential spoiler, the extends from a channel inside and forms a local channel cross-sectional constriction, wherein the closure elements in the closed position abut against a free end edge of the respective spoiler, which forms a stop.

According to another aspect of the invention, this relates to a building arrangement with a building wall having a wall opening into which a wall box having an air passage cross-sectional geometry is inserted, wherein a closure arrangement of the type described above is inserted into the wall box. In this case, the channel has an outer geometry, which differs from the Luftdurchlassquerschnittsgeometrie. On the outer circumference of the channel according to the invention a diameter compensation element, for example a circumferential, elastic sealing element is arranged, which is designed to compensate for the deviation between the channel outer geometry and the Luftdurchlassgeometrie. According to the invention can therefore be provided that the outer dimensions of the channel are slightly undersized, in which case the required, fluidly sealed closure between the channel and the wall box is ensured by means of the compensating element.

Figur 1

eine schematische Darstellung einer ersten Ausführungsform der erfindungsgemäßen Verschlussanordnung in der Schließstellung im Längsquerschnitt;

Figur 2

die Ausführungsform gemäß Figur 1 in der Offenstellung;

Figur 3

eine perspektivische und teiltransparente Darstellung einer zweiten Ausführungsform der erfindungsgemäßen Verschlussanordnung in der Schließstellung;

Figur 4

eine Detailansicht der Verschlusselemente der Ausführungsform gemäß Figur 3 in der Offenstellung;

Figur 5

eine perspektivische Teilansicht der Einströmseite der Ausführungsform gemäß den Figuren 3 und 4 in der Offenstellung;

Figur 6

eine perspektivische Teilansicht der Einströmseite der Ausführungsform gemäß den Figuren 3 bis 5 mit einer geöffneten und einer geschlossenen Klappe.; und

Figur 7

eine Querschnittsansicht noch einer anderen Ausführungsform der erfindungsgemäßen Verschlussanordnung in der Offenstellung.

Further details of the invention will be explained with reference to the following figures. Showing:

FIG. 1

a schematic representation of a first embodiment of the closure assembly according to the invention in the closed position in the longitudinal cross section;

FIG. 2

the embodiment according to FIG. 1 in the open position;

FIG. 3

a perspective and partially transparent representation of a second embodiment of the closure assembly according to the invention in the closed position;

FIG. 4

a detailed view of the closure elements of the embodiment according to FIG. 3 in the open position;

FIG. 5

a partial perspective view of the inflow side of the embodiment according to the Figures 3 and 4 in the open position;

FIG. 6

a partial perspective view of the inflow side of the embodiment according to the FIGS. 3 to 5 with an open and a closed flap .; and

FIG. 7

a cross-sectional view of yet another embodiment of the closure assembly according to the invention in the open position.

The FIG. 1 shows in longitudinal cross section a simplest embodiment of the invention in a schematic representation. The left-hand opening of the channel 1 in the illustration forms the air inflow side, and accordingly the right-hand opening in the illustration is the air outflow side of the channel 1. The direction of air flow is indicated by the arrows R. The in FIG. 1 shown channel 1 is a circular channel and thus the drawn longitudinal axis X and the axis of symmetry of the channel.

At the in FIG. 1 illustrated embodiment, three closure elements 2 are arranged spaced apart in the air flow direction by the same distance. Each closure element 2 has two opposing flaps 3, which are articulated via a hinge side extending perpendicular to the plane of the drawing. The hinge sides are perpendicular to the longitudinal axis X, so that the hinge sides of the opposing flaps 3 of each closure element 2 coincide. The hinges are provided in the form of an airtight web 9. This can for example be formed as a rubber-elastic component, in which the ends of the opposing flaps of each closure element 2 embedded are. Will the in FIG. 1 in the closed position shown closure elements 2 in the in the illustration according to FIG. 2 transferred shown open position, the elastic webs 9 are biased so that they act in the open position as a return spring element, which exerts a restoring moment in the direction of the closed position on the flaps 3. At the rearmost in the air flow direction closure element 2 engages an adjustment 10, with which the flaps 3 can be transferred against the bias of the webs 9 from the closed position to the open position. Adjacent flaps of adjacent closure elements are operatively coupled to each other via coupling elements 11.

The flaps 3 are formed as hollow profiles and thus have over solid material flaps improved thermal insulation properties. In addition, the flaps 3 are shaped so that they are in the in FIG. 2 illustrated open position of the closure assembly represent the lowest possible air resistance and shield the adjusting member 10 to avoid air vortices and its contamination. Due to the curved outer contour of the flaps 3, the closure assembly forms an outer geometry in the open position, which has a low air resistance.

It has been found that for the applications customary in the field of buildings, closure arrangements with three closure elements arranged one behind the other are already sufficient in order to achieve a greatly improved heat transfer coefficient over the systems known from the prior art.

In the in the FIGS. 3 to 6 In the illustrated embodiment, the flaps 3 of the closure elements 2 are optimized in such a way that the closure arrangement in the open position, on the one hand, forms the least possible air resistance and, on the other hand, rattling of the flaps 3 is effectively suppressed due to turbulence on the closure arrangement. The FIG. 3 In addition, it can be seen that the closure assembly 1 is divided into three similar segments, each comprising a channel portion in which one of the closure elements 2 is accommodated. The channel sections can be freely combined with each other in order to combine any number of closure elements 2 according to a specific application, if necessary.

The FIG. 4 shows the closure elements 2 of the embodiment according to FIG. 3 in the open position. For better illustration, the channel 1 is not shown. The flaps 3 of the different closure arrangements overlap in the open position, wherein the flaps each have a step 6, which is formed at a distance from the hinge side 4 of the respective flap, which corresponds to the distance between the closure elements 2. This makes it possible for the flaps 3 to lie flat against one another in the overlapping region 7 of the flaps 3. The flaps 3 of the closure elements 2 have on their side opposite the hinge side 4 each have a spoiler 8, which has a raised paragraph over a step, which is located in the open position flaps 3 in the overlap region 7 at a distance to the flap 3 of each next, downstream arranged closure element 2 is arranged. At the onset of airflow, the spoiler 8 produces an output, so that the flaps 3 are pressed against each other to avoid rattling and to bring the closure assembly 2 in a compact design as possible. The FIG. 5 clearly shows that due to the stage 6, the closure elements 2 in the open position can take a very compact design in which they represent a low air resistance.

As in FIG. 5 is further shown, the channel 1 on its inner side an inner contour 12, with varying in the channel length X diameter. The inner contour 12 has chamfers, along which the flaps are guided in their movement between the open position and the closed position under compression of a compression seal on the outer periphery of the flaps.

At the in FIG. 7 1, a spoiler 8 is formed on the inner circumference of the channel 1 per closure arrangement 2 and flap pair 3, extending from the inside of the channel 1 and extending circumferentially on the inside of the channel 1. Each spoiler 8 has a free end edge or spoiler edge, which forms a stop for the flaps 3. The flaps 3 are provided at their sealing edge, with which they rest in the closed position on the inside of the channel 1, with a fold to form a sealing ridge over which the flaps 3 sealingly abut against the inside of the channel 1. The sealing bar has the task of increasing the sealing area between the flap 3 and the channel 1.

The features of the invention disclosed in the foregoing description, in the drawings and in the claims may be essential to the realization of the invention both individually and in any combination.

LIST OF REFERENCE NUMBERS

1

channel

2

closure element

3

flap

4

hinge side

5

sealing contour

6

step

7

overlap area

8th

spoiler

9

Airtight bridge

10

adjustment

11

coupling element

12

inner contour

13

end edge

X

longitudinal axis

R

Air flow direction

Claims (20)

Closure arrangement for an air duct, having a channel (1) and at least two closure elements (2) arranged in the channel (1), wherein the closure elements (2) are arranged between an open position, in which the closure elements (2) form a cross-section of the channel (1). a closed position in which the closure elements (2) sealingly abut an inner circumference of the channel (1) and close the channel (1) are pivotable, and wherein the closure elements (2) along the longitudinal axis (X) of the channel ( 1) and in an air flow direction (R) through the channel (1) are arranged spaced apart by a distance, so that in the closed position between the closure elements (2), a fluid-sealed space is formed. Closure arrangement according to claim 1, wherein the closure elements (2) each have two flaps (3) along its circumference a hinge side (4) whose length corresponds to an inner dimension of the channel (1), and otherwise have a sealing contour (5) which is adapted to a contour of the inner circumference of the channel (1). Closure arrangement according to Claim 2, in which the two flaps (3) of each closure element (2) are arranged adjacent to one another with their hinge sides (4), the flaps (3) being folded toward one another in the open position and extending along the longitudinal axis (X). of the channel (1) or extend parallel thereto. The closure assembly of claim 3, wherein the flaps have a dimension perpendicular to their respective hinge side (4) that is greater than the distance one of the flaps of a first closure element of the closure elements (2) overlaps one of the flaps of at least one further closure element of the closure elements (2) in the closed position. A closure assembly according to claim 4, wherein the flaps (3) each comprise a step (6) spaced from the hinge side (4) by the distance and parallel to the hinge side (4) such that the flaps (3) engage in an overlap region (7) of the flaps (3) abut each other. A closure assembly according to claim 5, wherein the flaps (3) of at least a first one of the closure members (2) have, on their side opposite the hinge side (4), a spoiler (8) having a heel raised on a step which is located in the In the overlap region (7) at a distance from a flap (3) of another of the closure elements (2), which is arranged downstream of the first closure element (2), so that the overlapping flaps (3 ) are pressed against each other via an output of the spoiler (8) having flap (3) when the closure elements (2) are flowed in the open position of an air flow. A closure assembly according to any one of the preceding claims, wherein the flaps (3) are formed as cavity profiles having an enclosed volume of gas. A closure arrangement according to claim 3, wherein the adjacent hinge sides (4) of the flaps (3) of each closure element (2) are interconnected via an airtight web (9), the airtight web (9) having a return element which in the open position the flaps (3) provides a restoring moment in the direction of the closed position. A closure assembly according to any one of the preceding claims, wherein the flaps (3) have a curved contour with a convex outside and a concave inside. Closure arrangement according to claim 2, wherein the sealing contour (5) has a compression seal, such as a rubber lip or a foam element, or a brush element, so that in the closed position between the inner circumference of the channel (1) and the sealing contour (5) an impact gap is formed , A closure assembly according to claim 10, wherein the channel (1) has an inner contour (12) of varying diameter in the channel longitudinal direction (X), the inner contour (12) having chamfers along which the flaps move between the open position and the closed position are performed under compression of the compression seal. A closure arrangement according to claim 2, wherein the two flaps (3) of each closure element (2) are arranged adjacent to one another with their hinge sides (4), and in which the closure elements (2) via an adjusting drive (10) between the open position and the closed position and forth are movable, wherein the adjusting drive (10) on the flaps (3) in the air flow direction (R) rearmost closure element (2) engages, and wherein the overlapping flaps (3) with each other via coupling elements (11) are coupled together. Closure arrangement according to claim 12, wherein in the open position the adjusting drive (10) is surrounded by the flaps (3) of the rearmost closing element (2) in the air flow direction (R) or is located in the slipstream of the closing elements (2). Closure arrangement according to claim 12 or 13, wherein the coupling elements (11) comprise a coupling rod, a coupling rod or a coupling thread which extends at an angle 0 ° <α <90 ° to the longitudinal axis of the channel (1) and thus under a different distance to the hinge sides with the overlapping flaps (3) is connected. A closure assembly according to any one of the preceding claims wherein the channel (1) is longitudinally subdivided into a plurality of channel sections detachably connected to each other, one of the closure elements (2) being received in each channel section. Closure arrangement according to one of the preceding claims, wherein the closure elements (2) via an adjusting drive (10) between the open position and the closed position are movable back and forth, wherein the adjusting drive (10) has at least one spring element which has a closing torque in the closed position the closure elements (2) exerts. A closure arrangement according to claim 16, in which the closing moment exerted by the spring element on the closure elements (2) is degressive, increases in the direction of the closed position and is maximal in the closed position. A closure assembly according to any one of the preceding claims, wherein the flaps (3) of the closure member (2) have a coating, coating or coating to reduce thermal radiation transmission, for example an aluminum foil coating. Closure arrangement according to one of the preceding claims, in which the channel (1) has on its inner periphery per closure element (2) a peripheral spoiler (8). having, which extends from a channel inside and forms a local channel cross-sectional constriction, wherein the closure elements (2) in the closed position at a free end edge (13) of the respective spoiler, which forms a stop. A building structure having a building wall having a wall opening into which a wall box having an air passage cross-sectional geometry is inserted, wherein in the wall box, a closure assembly according to one of the preceding claims is used, wherein the channel (1) has an outer geometry which differs from the Luftdurchlassquerschnittsgeometrie, and wherein on the outer circumference of the channel (1) a compensation element, for example a circumferential, elastic sealing element is arranged, which is designed to compensate for the deviation between the channel outer geometry and the Luftdurchlassquerschnittsgeometrie.

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