EP3299740B9 - Louvre for use in a conduit of an air conditioning system or a mechanical smoke ventilation assembly - Google Patents

Description

The invention relates to a louvre flap for use in a line of an air conditioning and ventilation system or a mechanical smoke extraction system (MRA) comprising, on the one hand, a frame which forms a rectangular opening for the flow of a gaseous medium, and on the other hand at least two rectangular slats, wherein each lamella, preferably coextensive with at least one further lamella, is pivotally mounted in the frame between its closed position and its open position about a respective pivot axis, and each lamella has on the one hand two longitudinal edges oriented parallel to its pivot axis and on the other hand two side edges oriented orthogonally to its pivot axis , wherein the pivot axis, preferably in the middle, is arranged between the longitudinal edges, and wherein at least one of the longitudinal edges of adjacent slats cooperating in the closed position has a seal.

The US 2014/0008561 A1 discloses a generic Venetian blind flap wherein the pairs of beveled edges each have a pair of longitudinal edges and a cold seal is arranged on each longitudinal edge of a pair of longitudinal edges, the two seals of a pair of longitudinal edges being arranged next to one another and spaced apart from one another in the closed position.

In the closed position of the slats, louvre flaps are intended to close the flow cross-section and prevent the medium from flowing. In known louvre flaps, the slats have a rectangular cross-sectional shape. A lip seal protruding over the longitudinal edge is provided on one of the two longitudinal edges of each lamella. When swiveling the Slats from their open position to the closed position, each lip seal is folded when it comes into contact with the longitudinal edge of the adjacent slat. The disadvantage is that a high torque is applied for reopening must be used, as the lip seals folded in one direction have to fold in the other direction when swiveling open. Otherwise, pressure can act on both sides of a multi-leaf damper. The side on which a print is acting is therefore not predictable. Due to the lip seals folded over in the closed position, the louvre withstands the tightness with one side of a significantly higher pressure than with the other side.

The object of the invention is to avoid the aforementioned disadvantages and to provide a louver that is in particular easier to open with at least the same tightness and also - if the louver is used as a fire protection component - can still be opened within a certain period of time after the fire.

This object is achieved in that each of the two surfaces of the longitudinal edges of at least one pair of adjacent slats interacting in the closed position, forming an inclined edge pair with respect to the orthogonal O, which is perpendicular to the plane E spanned by the respective slat, at an angle α which between 10 ° and 60 °, preferably between 25 ° and 40 °, preferably 30 °, and that in the closed position the two surfaces of this pair of adjacent slats are facing each other, in particular parallel, in such a way that the height of the slat increases in relation to the pivot axis across the width of the lamella in the direction of pivoting from the closed position to the open position. The pivot axis is preferably also arranged centrally in relation to the thickness of the lamella in question. The frame can be formed in one piece or, for example, consist of four frame elements arranged at right angles to one another.

The configuration according to the invention allows the slats to be closed homogeneously. The torque required in particular for opening is smaller.

Therefore, the drive can be dimensioned smaller. Due to the oblique orientation of the two surfaces forming a pair of inclined edges, if the seal is provided, for example, there is no folding over of the folded seal when the slats are swung open, since the surfaces in the first section are moved away from each other in a fairly straight line. Another advantage of the embodiment according to the invention is that the sealing (s) is (are) better protected by the oblique orientation of the two surfaces forming a pair of oblique edges in the closed position. This is particularly relevant when the multi-leaf damper is used as a fire protection component. If the multi-leaf damper is used as a fire protection component and at least one seal is designed as a warm seal, the oblique alignment after a fire also allows the slats to be opened within a certain period of time.

If each slat is not rectangular, but is, for example, triangular or diamond-shaped, the pivot axis is arranged at the widest point of the slat in question. The width of the slat then decreases in both directions. In the case of a triangular configuration of the lamella, the pivot axis lies in one of the three side edges. The width then decreases continuously in the direction of the other two side edges. Since the lamella does not extend any further in the opposite direction, the width here is zero.

At least two lamellae, preferably all lamellae, can be connected, for example, via a common coupling element such that when the coupling element is displaced, the position of all the lamellae connected to one another via this coupling element can be changed equally. The coupling element, which is preferably arranged outside the frame, can act directly or indirectly on the pivot axes of the slats coupled to one another.

The frame can at least in one of the two areas, which in the closed position of the slats extend parallel to the upper and lower slats, have a stop surface which is oriented such that it is at least approximately parallel to the surface of the longitudinal edge of the adjacent lamella when it is in its closed position, forming a pair of inclined edges. The stop surface can be part of a stop bar, for example, which is mounted on the inside of the frame. The surface of the longitudinal edge of the adjacent lamella is at an angle α with respect to the orthogonal O, which is perpendicular to the plane E spanned by the lamella, which is between 10 ° and 60 °, preferably between 25 ° and 40 °, preferably at 30 ° lies, aligned. The stop surface and the surface of the longitudinal edge of the adjacent lamella are preferably exactly parallel. However, a deviation of up to a maximum of 20 ° is also conceivable.

However, it is also possible for at least one stop surface to be part of the region which extends in the closed position of the slats parallel to the upper and lower slats. In this case, the stop surface may have been generated, for example, by milling at an angle α.

All pairs of inclined edges are preferably of identical design, in particular with regard to the inclined configuration of the surfaces interacting with one another.

In at least one of the two areas, which in the closed position of the slats extend parallel to the side edges of the slats, the frame can have a partial area provided with a seal, which extends along the side edges of the slats located in the closed position. The seal can, for example, be glued to the partial area. However, other types of fastening of the seal are also possible. Preferably, at least one partial area can be delimited on both sides, in particular in the form of a recess. In such an embodiment, the seal is located within the recess, the seal being able to be formed above the recess. The seal can, for example, be glued into the recess. This seal is preferably a cold seal. Suitable as a cold seal For example, there is a seal based on calcium-magnesium-silica chemistry. It has the following chemical composition in% by weight: SIO ₂ 61.0-67.0, CaO 27.0-33.0, MgO 2.5-6.5, Al ₂ O ₃ <1.0, Fe ₂ O ₃ <0.6. Such a cold seal is available, for example, under the name Kerafix® 2000. The cold seal has thermal and physical stability up to the functional limit of 1,100 ° C and is ceramic-free. The melting point is greater than 1,300 ° C. Due to the high melting point, the seal is also suitable for warm sealing. In this way, the area between the frame and the side edges of the slats in the closed position is sealed. Bushings for the pivot axes of the slats can be provided in the frame and in the seal. The width of the seal can preferably correspond approximately to the thickness of the lamellae. Alternatively or in addition, at least one lamella can also have at least one seal in the area of at least one of its two side edges, preferably in the area of its two side edges.

At least one seal can be arranged in a recess. The seal preferably protrudes only with a partial area from the recess. But it is also quite possible that the seal is completely in the recess. This configuration makes it possible for the seal, for example a cold seal designed as a hollow profile seal, to expand laterally in the recess in the closed position of the associated lamella.

Each of the two surfaces of at least one pair of inclined edges has at least one seal. A pair of beveled edges is understood to mean, on the one hand, the area of the longitudinal edges of two adjacent slats and, on the other hand, the area of a frame-side stop surface and the longitudinal edge of the adjacent slat. If the pair of inclined surfaces is formed by two adjacent slats, the two surfaces are the surfaces of the cooperating longitudinal edges of a pair of adjacent slats. If the pair of inclined surfaces is formed by a stop surface and the adjacent lamella, the two are Areas around the stop surface and around the surface of the cooperating longitudinal edge of the adjacent lamella.

In the case of at least one pair of inclined edges, at least one seal is arranged in an area at least partially opposite in a direction orthogonal to both surfaces. In such a configuration, the seals touch in the closed position, provided that the gap is smaller than the extent to which both seals protrude from the respective lamella. If the seals are each arranged in a recess and preferably only protrude from their respective recess with a partial area, a seal designed as a warm seal can expand into the opposite recess in the event of a fire. A certain interlocking is achieved in this way. Due to the oblique alignment of the surfaces of each pair of bevelled edges, it is still possible to open the slats later, even with a foamed-on warm seal.

In the case of at least one pair of inclined edges, at least one seal can alternatively be arranged in a mutually offset direction in a direction orthogonal to both surfaces. With such a configuration, the seals do not touch in the closed position.

At least one seal is a warm seal that expands when exposed to heat, preferably in the form of a strip.

At least one warm seal can consist of a laminate-based foamer. Such a foamer, such as is available under the trade name PROMASEAL®-LW, is designed as a pressure-free, flexible fire protection laminate. In the event of a fire, expansion occurs many times over when the foaming temperature of about 300 ° C is reached, so that the resulting foam layer has an insulating effect. However, since the frother does not exert any inflation pressure, the expansion process is completed after the available space in the form of the gap has been filled. The slats can therefore also by means of a smaller sized actuator can be shifted from its closed position back to its open position.

At least one seal is designed as a cold seal, such as Kerafix® 2000. If the cold seal is provided on the lamella, for example, it protrudes at least with a partial area opposite the relevant longitudinal edge and / or side edge of the lamella. A cold seal is used to seal a gap against flow.

At least one cold seal can be embodied as a hollow profile seal, in particular as a hollow profile seal having a round or semicircular cross section. Of course, other cross-sectional shapes are also conceivable. The cold seal can also be designed in the form of a strip.

At least one cold seal can consist of a thermoplastic elastomer (TPE). Such a design is particularly useful when using the cold seal on the lamella.

It is advisable if at least one cold seal for fastening to the lamella on its side facing the lamella or on the stop surface on its side facing the stop surface extends at least over a portion of the cold seal, preferably over the entire length of the cold seal Has web which can be inserted into a groove provided in the longitudinal edge and / or the side edge of the lamella or in the stop surface.

The web of at least one cold seal can have at least one laterally projecting locking lug that fixes the web in the groove.

With at least one pair of inclined edges, at least one cold seal can be provided in one surface and at least one warm seal in the other surface. As a result, each gap formed between the longitudinal edges of two adjacent slats is both a cold seal and one Warm seal assigned. A pair of beveled edges is understood to mean, on the one hand, the area of the longitudinal edges of two adjacent slats and, on the other hand, the area of a frame-side stop surface and the longitudinal edge of the adjacent slat. If the pair of inclined surfaces is formed by two adjacent slats, the two surfaces are the surfaces of the cooperating longitudinal edges of a pair of adjacent slats. If the pair of inclined surfaces is formed by a stop surface and the adjacent lamella, the two surfaces are the stop surface and the surface of the cooperating longitudinal edge of the adjacent lamella.

The louver damper can be designed as a smoke extraction damper. Smoke control dampers serve to keep areas in a building, for example an escape area, smoke-free. The area of application of a smoke extraction damper is at a temperature that is between the ambient temperature of the area to be kept smoke-free (cold smoke extraction) and a temperature of up to 1000 ° C or more (hot smoke extraction). In this respect, smoke extraction dampers must ensure cold sealing on the one hand and warm sealing on the other. Due to the possibly high temperatures, the housing, the lamellae and a motor encapsulation of a drive device arranged on the outside of the housing usually consist of a calcium silicate. Smoke control dampers are usually triggered by a smoke detector. Of course, other triggering devices, such as. B. a manual release device, a remote release device or the like, conceivable. The energy for opening and closing must be permanently on the slats. Smoke control dampers are designed so that even after they have been triggered, i. H. after pivoting from the open position into the closed position, a subsequent opening, d. H. pivoting into the open position is guaranteed. Of course, this also applies to the reverse case.

The louver can also be designed as a fire damper. Fire dampers usually have a housing made of metal, in which the slats made of calcium silicate are pivoted. A Fire damper can be operated manually, for example. For pivoting the slats from their closed position against the restoring force into the open position, ie for tensioning the spring, a preferably arranged on the outside of the housing actuating element, such as. B. an operating handle provided. The slats are fixed in their open position against a restoring force by means of a fixing device. For example, in the event of a fire, i.e. if the temperature exceeds a value of approximately 72 ° C, the slats are moved from their open position to their closed position by the restoring force provided by the spring after a triggering device, for example a fusible link, has been triggered panned. At the same time, every warm seal inflates. The foamed warm seal (s) now completely fills any gap that may still exist between the frame and the fins and also between two adjacent fins.

Of course, the multi-leaf flap can also be designed as a combined fire protection and smoke extraction flap.

Fig. 1

eine schräge Draufsicht auf eine erfindungsgemäße Jalousieklappe,

Fig. 2

einen Schnitt durch den Gegenstand nach Fig. 1 sowie Details a), b) und c) der gekennzeichneten Bereiche in Fig. 2,

Fig. 3

eine detailliertere Ansicht von Fig. 2 a),

Fig. 4

den Gegenstand nach Fig. 3 ohne Warmdichtung und Lamelle,

Fig. 5

eine detaillierte Ansicht von Fig. 2 c) ohne Lamelle,

Fig. 6

den Gegenstand nach Fig. 5 ohne Kaltdichtung,

Fig. 7

eine vergrößerte Ansicht des Bereichs der zusammenwirkenden Flächen eines Paars benachbarter Lamellen (Schrägkantenpaar),

Fig. 8

den Bereich "X" aus Fig. 7,

Fig. 9

den Bereich "Y" aus Fig. 7 und

Fig. 10

eine schräge Ansicht auf die Innenseite des Rahmens mit einer Lamelle in der Offenstellung.

Exemplary embodiments of the invention illustrated in the drawings are explained below. Show it:

Fig. 1

an oblique plan view of a Venetian blind flap according to the invention,

Fig. 2

a section through the object Fig. 1 as well as details a), b) and c) of the marked areas in Fig. 2 ,

Fig. 3

a more detailed view of 2 a) ,

Fig. 4

the subject Fig. 3 without warm seal and lamella,

Fig. 5

a detailed view of 2 c) without slat,

Fig. 6

the subject Fig. 5 without cold seal,

Fig. 7

an enlarged view of the area of the interacting surfaces of a pair of adjacent slats (pair of beveled edges),

Fig. 8

the area "X" Fig. 7 ,

Fig. 9

the area "Y" Fig. 7 and

Fig. 10

an oblique view of the inside of the frame with a slat in the open position.

Corresponding reference numerals are used in all figures for identical or similar components.

The figures show a louvre flap which is designed as a combined fire protection and smoke extraction flap. The multi-leaf damper is intended for use in a line of an air conditioning and ventilation system (not shown) or a mechanical smoke extraction system (MRA).

The louver flap comprises a frame 1 which forms a rectangular opening for the flow of a gaseous medium. The frame 1 consists of four frame elements which are connected to one another. Furthermore, the louver flap has ten rectangular slats 2. An auxiliary housing 3 is adjacent to the frame 1. A drive and a coupling element which can be displaced by means of a drive are arranged therein. All slats 2 are connected via the coupling element, so that when the coupling element is displaced, the position of all the slats 2 connected to one another via this coupling element can be changed equally. The coupling element can act directly or indirectly on the pivot axes 4 of the slats 2 coupled to one another. In such an embodiment, the slats 2 can run in the same direction, i. H. be pivoted in a common direction.

In this way, the slats 2 are mounted in the frame 1 between their closed position and their open position so as to be pivotable about their respective pivot axis 4. Each lamella 2 has two parallel to it Longitudinal edges 5 aligned with pivot axis 4 and two side edges 6 aligned orthogonally to their pivot axis 4. Each pivot axis 4 is arranged centrally between the longitudinal edges 5 of its lamella 2 and also centrally in relation to the thickness of its lamella 2.

How in particular Fig. 7 It can be seen that each of the two surfaces of the longitudinal edges 5 of each pair of adjacent slats 2 interacting in the closed position forms an inclined edge pair with respect to the orthogonal O, which is perpendicular to the plane E spanned by the respective slat 2, at an angle α of 30 ° aligned. In the closed position, the two surfaces of each pair of adjacent slats 2 face each other and, in the exemplary embodiment shown, are aligned parallel to one another. Like for example Fig. 2 can be seen, the height h _{1 of} the slat 2 increases in relation to the pivot axis 4 over the width of the slat 2 to the height h _{2 of} the slat 2 in the direction of pivoting (arrow V) from the closed position shown in the open position, not shown.

Like for example Fig. 2 and the 4 and 6 can be seen, the frame 1 has in its upper and in its lower area, which extend parallel to the upper and lower slats 2 in the closed position of the slats 2, a stop surface 7. Each stop surface 7 is part of a stop bar 8 mounted on the inside of the frame 1. Each stop surface 7 is aligned in such a way that it is aligned parallel to the surface of the longitudinal edge 5 of the adjacent lamella 2 when it is in its closed position, forming a pair of bevel edges is.

Each of the two surfaces of all pairs of bevel edges each has a seal. A pair of inclined edges is understood to mean, on the one hand, the area of the longitudinal edges 5 of two adjacent slats 2 and, on the other hand, the area of a frame-side stop surface 7 and the longitudinal edge 5 of the adjacent slat 2.

The surface of each inclined edge pair pointing upwards in the closed position has a seal designed as a cold seal 9, while a warm seal 10 is provided as a seal in the surface pointing downwards in the closed position.

How Fig. 7 it can be seen that in the case of all pairs of bevel edges the two seals are arranged in opposite directions in a direction orthogonal to both surfaces. The two seals 9, 10 therefore touch in the closed position.

Like for example Fig. 4 shows, the strip-shaped heat seal 10 is arranged in a recess 11 in the surface or the frame-side stop surface 7 and protrudes only with a partial area from the recess 11.

Each cold seal 9 arranged on the fins 2 is designed as a hollow profile seal with a round cross section and consists of a thermoplastic elastomer (TPE). Such an embodiment is for example in the 7 and 9 recognizable. For attachment to the lamella 2, a web 12 is provided on its side facing the lamella 2 and extends over the entire length of the cold seal 9 and can be inserted into a groove 13 provided in the longitudinal edge 5 of the lamella 2 or in the stop surface 7. The web 12 has locking lugs 14 projecting laterally on both sides. The groove 13 is made in a recess 11 so that the hollow profile seal protrudes from the recess 11 only with a partial area.

In the Fig. 7 shown arrangement of the two seals 9, 10 of each pair of inclined edges in a direction seen orthogonally to both surfaces in opposite areas has further advantages. Thus, on the one hand, in the closed position of the lamellae 2, the cold seal 9 designed as a hollow profile seal can be located in the recess 11 in FIG Fig. 7 Extend lower slat 2 laterally. At the same time, the recess 11 in the in Fig. 7 lower slat 2, ie in the area which is arranged opposite the hot seal 10, that the hot seal 10 is in the event of fire can expand into the opposite recess 11. A certain interlocking is achieved in this way. Due to the oblique orientation of the surfaces of each pair of bevelled edges, a later opening of the slats 2 is still possible even with a foamed-on warm seal 10.

For lateral sealing, the frame 1 has a partial area 15 provided with a seal 9 in both areas, which in the closed position of the slats 2 extend parallel to the side edges 6 of the slats 2. This partial area 15 extends along the side edges 6 of the slats 2 in the closed position. In the two areas, which extend parallel to the side edges 6 of the slats 2 in the closed position of the slats 2, the seal 9 is only glued in the partial area 15 and not - like the seal 10 in the two areas, which extend parallel to the upper and lower slats 2 in the closed position of the slats 2 - arranged in a recess 11.

In the frame 1 and in the seal bushings 16 are provided for the pivot axes 4 of the slats 2. In the exemplary embodiment shown, the width of the seal corresponds approximately to the thickness of the lamellae 2. In the exemplary embodiment shown, the seal applied to the inside of the frame 2 is designed as a strip-shaped cold seal 9. This cold seal 9 applied here is based on a calcium-magnesium-silica chemistry. Such a cold seal 9 is available, for example, under the name Kerafix® 2000, Kerafix® 2000 also provides a warm seal.

As can be seen from the drawings, the cold seal 9 arranged in the regions of the frame 1, which extend parallel to the side edges 6 of the slats 2 in the closed position of the slats 2, and those arranged on each slat 2 and on the lower stop surface 7 Cold seal 9 a different design. Thus, the cold seal 9 arranged in the areas of the frame 1, which in the closed position of the slats 2 extend parallel to the side edges 6 of the slats 2, is in each case strip-shaped, while that on each slat 2 and on the lower one Stop surface 7 arranged cold seal 9 is designed as a hollow cross-section seal having a round cross section

Claims (12)

1. Louvre for use in a conduit of an air conditioning system or a mechanical smoke ventilation assembly (MRA), comprising as one feature a frame (1), which forms a rectangular opening for the flow of a gaseous medium, and as another feature at least two rectangular shaped slats (2), wherein each slat (2) preferably running coaxially with at least one further slat (2) which is mounted on the frame (1) such as to be able to pivot between its closed position and its open position about a respective pivot axis (4), and each slat (2) likewise comprises on one side two longitudinal edges (5) aligned parallel to their pivot axis (4), and, on the other side, two side edges (6) aligned orthogonally to their pivot axis (4), wherein the pivot axes (4) are preferably arranged in the middle, between the longitudinal edges (5), and wherein at least one of the longitudinal edges (5) of adjacent slats, interacting in the closed position, comprises a seal (9, 10), wherein
   each of the two surfaces of the longitudinal edges (5) interacting in the closed position, of at least one pair of adjacent slats (2), with the formation of an oblique edged pair opposite the orthogonal (O) which stands perpendicular on the plane E which is spanned by the respective slat (2), is aligned at an angle α, which lies between 10º and 60º, preferably between 25º and 40º, preferably 30º, and wherein, in the closed position, the two surfaces of this pair of adjacent slats (2) facing towards one another, in particular parallel, are aligned in such a way that the height of the slat (2) in relation to the pivot axis (4) increases over the width of the slat (2) in the direction of pivoting (V) from the closed position into the open position, and wherein each of the two surfaces of at least one oblique edged pair comprises at least one seal (9, 10), wherein at least one seal is a heat seal (10), which expands under the effect of heat, preferably formed in strip pattern, wherein one seal is configured as a cold seal (9), and wherein, with the at least one oblique edged pair, in each case at least one seal (9, 10), in a direction seen as orthogonal to both surfaces, is arranged in a region at least partially opposite.
2. Louvre in accordance with the preceding claim, characterised in that the frame (1) comprises, at least in one of the two regions which, in the closed position of the slats (2), extend parallel to the upper and the lower slat (2), a contact surface (7), which is aligned in such a way that it is aligned at least approximately parallel with the surface of the longitudinal edge (5) of the adjacent slat (2) when this is in the closed position, with the formation of an oblique edged pair.
3. Louvre in accordance with any one of the preceding claims, characterised in that the frame (1), in at least one of the two regions which in the closed position of the slats (2) extend parallel to the side edges (6) of the slats (2), comprises a part region (15) provided with a seal (9, 10), which extends along the side edges (6) of the slats (2) in the closed position.
4. Louvre in accordance with any one of the preceding claims, characterised in that at least one seal (9, 10) is arranged in a cut-out opening (11) and preferably projects with a part region out of the cut-out opening (11).
5. Louvre in accordance with any one of the preceding claims, characterised in that, with at least one oblique edged pair, in each case at least one seal (9, 10), in a direction seen orthogonally to both surfaces, is arranged in regions arranged offset to one another.
6. Louvre in accordance with any one of the preceding claims, characterised in that at least one hot seal (10) consists of a laminate-based foaming agent.
7. Louvre in accordance with any one of the preceding claims, characterised in that at least one cold seal (9) is configured as a hollow profile seal, in particular as a hollow profile seal exhibiting a circular or semi-circular cross-section.
8. Louvre in accordance with any one of the preceding claims, characterised in that at least cold seal (9) consists of a thermoplastic elastomer (TPE).
9. Louvre in accordance with any one of the preceding claims, characterised in that at least one cold seal (9), for securing to the slat (2), comprises, on its side facing towards the slat or, at the contact surface (7), on the side facing towards the contact surface (7), a web (12) extending at least over a part region of the cold seal (9), preferably over the entire length of the cold seal (9), which can be introduced into a groove (13) provided in the longitudinal edge (5) and/or the side edge (6) of the slat (2) or in the contact surface (7).
10. Louvre in accordance with any one of the preceding claims, characterised in that the web (12) of at least one cold seal (9) comprises at least one laterally projecting engagement nose (14).
11. Louvre in accordance with any one of the preceding claims, characterised in that the louvre is configured as a smoke ventilation flap.
12. Louvre in accordance with any one of the preceding claims, characterised in that the louvre is configured as a fire protection flap.

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