EP2592359B9 - Fire protection flap with a housing and a pivotable shut-off valve which can be pivoted around a pivoting axle, in particular a central pivoting axle - Google Patents

Description

The invention relates to a fire damper with a housing and with a pivotable about a pivot axis around, in particular centrally mounted butterfly valve, wherein the housing has a free flow cross-section, which is formed as a rectangular clear cross-section, the housing in the longitudinal direction (flow direction) seen from at least two interconnected housing segments consists and wherein a housing segment of these at least two housing segments is formed as a retaining segment for receiving the mounting of the pivot axis and at least one further housing segment of these at least two housing segments is designed as a connection segment for connecting the fire damper to a ventilation system, and further comprising one end each terminal segment is connected to one end of the retaining segment and the respective other end of each terminal segment is designed for mounting the fire damper on an on-site ventilation system.

Fire dampers are known in practice in various designs. They have a pivotally mounted butterfly valve, which operates manually or by motor becomes. Fire dampers are installed as part of ventilation ducts in wall ducts. In the event of a fire, they should shut off the ventilation duct and prevent a fire from spreading from one room to the next. Fire dampers are usually mortared for installation in a wall. For this purpose, an opening is made in the wall and the fire damper positioned in this opening. The resulting circumferential gap is filled with mortar or the like.

One known in the art fire damper consists of two housing segments, which are seen in the flow direction arranged one behind the other and connected to each other. Each housing segment consists of four partial surfaces. The retaining segment, in which the butterfly valve is mounted, has a circumferential, i. an inner bead extending over all the partial surfaces, which i.a. to achieve a clearance for the butterfly valve. A disadvantage proves that the introduction of a circumferential inner bead complicates the production and that the inner bead also represents an undesirable flow resistance.

The DE 102 14 240 C1 discloses a fire damper according to the preamble of claim 1.

In the prior art, different embodiments of components of air conditioning systems are known. The U.S. Patent 3,783,768 shows a shutter damper, the FR 2.045.061 different air channels and the EP 1 348 467 A1 a channel-shaped housing for a shut-off device in ventilation ducts.

The object of the invention is to avoid the aforementioned disadvantages and to provide a fire damper, which is aerodynamically cheaper and also easier to manufacture.

This object is achieved by a fire damper with the features of claim 1. Preferred embodiments are defined in the dependent claims. In this case, the width B _{H of} the free flow cross section between the axle bearings of the retaining segment along the entire length seen in the flow direction is smaller than the width B _{A of} the free flow cross section corresponding to the orientation in the region of each connection segment.

The ends of the terminal segment and the retaining segment can be detachably or permanently connected to each other. The fire damper is preferably aligned in the opening in the wall so that the retaining segment is in the opening of the wall and is mortared. Each connection segment preferably projects out of the wall.

Länge L_H

in Strömungsrichtung gesehener Abstand zwischen den beiden Enden des Haltesegmentes, die beispielsweise mit einem angrenzenden Gehäusesegment verbunden sind

Breite B_H

Abstand zwischen den beiden die Achslager beinhaltenden, d.h. orthogonal zur Schwenkachse ausgerichteten, seitlichen Teilflächen des Haltesegments

Höhe H_H

Abstand zwischen den beiden parallel zur Schwenkachse ausgerichteten seitlichen Teilflächen des Haltesegments

The length, the width and the height are understood by the example of the holding segment as the following geometric extensions:

Length L _H

Seen in the flow direction distance between the two ends of the retaining segment, which are connected, for example, with an adjacent housing segment

Width B _H

Distance between the two axle bearings containing, ie aligned orthogonal to the pivot axis, lateral faces of the retaining segment

Height H _H

Distance between the two parallel to the pivot axis aligned lateral faces of the retaining segment

Seen through the multi-part design of the fire damper in the flow direction, the width B _{H of} the retaining segment can be placed exactly on the corresponding to the orientation of the width B _{A of} the free flow cross-section in the region of each Anführungssegmentes. In this way, a clearance for the butterfly valve is created.

The length L _{H of} the retaining segment is preferably chosen so that the butterfly valve with its two perpendicular to the pivot axis arranged side edges during pivoting from the open position only shortly before submitting the closed position comes into contact with the adjacent part surfaces of the retaining segment.

In such an embodiment, the shut-off flap protrudes with its two parallel to the pivot axis aligned side edges in the open position, for example, in the adjacent terminal segment. Since the width B _{A of} the terminal segment is greater than the width B _{H of} the retaining segment, the outer ends of the two arranged perpendicular to the pivot axis side edges in the furnace position do not touch the faces of the terminal segment.

The height H _{H of} the retaining segment and the height H _{A of} the terminal segment can be placed on each other arbitrarily.

In a preferred embodiment, the height H _{H of} the free flow cross-section of the holding segment and the height H _{A of} the free flow cross-section in the region of each terminal segment may coincide. If the height H _H and the height H _{A are} identical, the fire damper will have much better flow characteristics. Thus, the fire damper has only in the region of the two sides, which are aligned perpendicular to the pivot axis of the butterfly valve, a flow resistance in the form of the resulting by the different widths Verleger.

Matching the height H _H and the height H _A also means a small deviation between the retaining segment and the associated connection segment of 2 to 10 mm in the region of each partial surface.

It makes sense that the height H _{H of} the free flow cross-section of the holding segment and the height H _{A of} the free flow cross-section along the entire seen in the flow direction length of the terminal segment match.

Preferably, in the retaining segment, the width B _{H of} the free flow cross section between the axle bearings, ie the bearing, is smaller by about 10 to 20 mm, preferably 16 mm, than the width B _{A of} the free flow cross section in the region of each connection segment corresponding to the orientation. Thus, the retaining segment - compared to the immediately adjacent sides of each terminal segment - the free flow area on each side of the butterfly valve, which is aligned orthogonal to the pivot axis, by about 5 to 10 mm, preferably 8 mm.

In the terminal segment, the length L _A is preferably the same for all sizes and is preferably about 200 mm. In the smallest embodiment of the fire damper according to the invention, the width B _{A of} each connection segment is preferably about 200 mm and the height H _{A is} about 100 mm. In a larger embodiment, the width B _{A may be} 1500 mm and the height H _A 800 mm.

The length L _{H of} the retaining segment is preferably the same for all sizes and is preferably about 100 mm. The height H _H (orthogonal to the direction of storage of the butterfly valve) of the retaining segment can be one to eight times greater than the length L _{H of} the retaining segment viewed in the direction of flow.

A small embodiment of a retaining segment in this case has the width B _H , which corresponds to the width B _{A of} the terminal segment (preferably about 200 mm) minus the two lateral projections of about 5 to 10 mm. The height H _{H of} a holding segment corresponds to the height H _{A of} the connecting segment and is preferably 100 mm.

A larger embodiment of a retaining segment in this case has the width B _H , which corresponds to the width B _{A of} the terminal segment (preferably about 1500 mm) minus the two lateral projections of about 5 to 10 mm. The height H _{H of} a retaining segment corresponds to the height H _{A of} the terminal segment and is preferably 800 mm.

The distance between the pivot axis and the outer end of the butterfly valve may be less than the distance between the pivot axis and the free end of the terminal segment. If the butterfly valve, for example, stored centrally, the distance between the pivot axis and the outer end of the butterfly valve corresponds to half the height of the butterfly valve. If it is a one-way mounted butterfly valve, ie the pivot axis is located along one edge of the butterfly valve, the distance between the pivot axis and the outer end of the butterfly valve corresponds to the full height of the butterfly valve. This configuration ensures that the shut-off flap does not protrude from the terminal segment of the fire damper at the end in the open position.

The free other end of the connection segment can be designed for connection to an on-site ventilation system.

But it is also quite possible that - if the fire damper seen in the flow direction - consists of only two housing segments - the free other end of the retaining segment is designed for connection to an on-site ventilation system.

The two free ends of the retaining segment can each be connected to a connection segment. In such an embodiment, the fire damper in the flow direction is formed in three parts. If the length L _{A of} a terminal segment is about 200 mm and the length L _{H of} the retaining segment about 100 mm irrespective of the width B _A and the height H _A , this results in a total length of the fire damper of about 500 mm.

At the end of a housing segment, which is connected to the end of an adjacent housing segment, a, in particular circumferential, outwardly extending flange may be provided for this connection. But it is also quite possible that the flange extends only in the region of the sides of the housing, while no flange is provided in the corner region. In this case, for example, corner plates may be used. Since the width B _{H of} the retaining segment is smaller than the width corresponding to the orientation B _{A of} the free flow cross-section of each terminal segment, the flange of the retaining segment is preferably formed correspondingly higher in this area.

At least two adjacent housing segments may be connected by means of a joining connection, such as soldering, welding or gluing. Of course, other connection techniques, such as rivets, screws or folding, possible.

At least one housing segment can be formed in several pieces in its circumferential direction. For example, two angles that are formed from two sides with a longitudinal deformation, be fixed against each other. Of course, four separate single walls are also conceivable.

In this case, at least one partial surface of at least one housing segment can be integrally formed with at least one further peripheral surface of this housing segment that adjoins in the circumferential direction.

At least one housing segment can be formed as one piece in its circumferential direction and have at least three longitudinal deformations and a longitudinal seam. The longitudinal deformation and the longitudinal seam are preferably aligned in parallel. If the housing segment has no circumferential inner bead or circumferential outer bead and thus the individual four housing areas are flat, the longitudinal transformations can be formed in a straight line over its length as in the case of a channel piece. A corresponding housing segment can be made of sheet metal, for example, by a bending process or bending process. The longitudinal transformations and the longitudinal seam can be formed continuously.

The retaining segment can be a longitudinally extending along the circumference of the butterfly valve in its closed state and limited on both sides, in particular formed as a groove, Part having portion which is provided with a material expands upon exposure to heat and whose width preferably corresponds at least outside the intersection between the holding segment and the pivot axis of the butterfly valve in about the thickness of the butterfly valve. In this case, at least one passage for the pivot axis can be provided in the housing and in the expansive material upon heat. Due to the subregion which forms an outwardly pointing groove or bead on the finished retaining segment, any longitudinal deformation over the entire length L _{H of} the retaining segment is not rectilinear, since the longitudinal deformation in the subregion opposite to the two other, adjacent longitudinal "rest areas" of the Holding segment protrudes outward. Thus, an identical height of the sub-area over the circumference of the holding segment is realized at each point.

By means of a fixing device, the pivotally mounted shut-off valve can be fixed against a restoring force in its open position and from the fixed position (open position or "on" position), for example in case of fire after release of the fixing by the restoring force in its closed position ("closed" position ) be pivotable. For pivoting the butterfly valve from its closed position against the restoring force in the open position, i. for tensioning, for example, an actuating element preferably arranged on the outside of the housing, such as e.g. an operating handle, be provided.

For a seal can be provided between two connected housing segments a seal.

Preferably, the housing segments are manufactured separately and then connected to each other, wherein at least one partial surface of at least one housing segment is integrally formed with at least one circumferentially adjacent further partial surface of this housing segment.

Fig. 1

eine schräge Draufsicht auf eine erfindungsgemäße Brandschutzklappe einschließlich der Details A und B,

Fig. 2

den Gegenstand nach Fig. 1 ohne Eckbleche einschließlich des Details A,

Fig. 3

den Gegenstand nach Fig. 1 ohne Eckbleche und im noch nicht verbundenen Zustand,

Fig. 4

eine Veranschaulichung des Biegevorgangs und des anschließenden Schließens bei einem in Umfangsrichtung gesehen einstückig ausgebildeten Gehäusesegmentes einschließlich des Details A,

Fig. 5

eine Draufsicht auf ein Blech zur Herstellung eines in Umfangsrichtung gesehen einstückig ausgebildeten Anschlusssegmentes sowie eine schräge Draufsicht auf ein fertig gebogenes Anschlusssegment ohne Eckbleche,

Fig. 6

eine Draufsicht auf ein Blech zur Herstellung eines in Umfangsrichtung gesehen einstückig ausgebildeten Haltesegmentes sowie eine schräge Draufsicht auf ein fertig gebogenes Haltesegment ohne Eckbleche,

Fig. 7

in abstrahierter Weise das Querschnittsprofil entlang der Linie VII in Fig. 1 einschließlich des Details Y,

Fig. 8

in abstrahierter Weise das Querschnittsprofil entlang der Linie VIII in Fig. 1 einschließlich des Details Z,

Fig. 9

eine schräge Draufsicht auf eine erfindungsgemäße Brandschutzklappe ohne Eckbleche und im noch nicht verbundenen Zustand, wobei das Haltesegment in seiner Umfangsrichtung gesehen zweistückig ausgebildet ist,

Fig. 10

eine Veranschaulichung des Biegevorgangs und des anschließenden Schließens bei einem in seiner Umfangsrichtung gesehen zweistückig ausgebildeten Haltesegmentes einschließlich der Details A und B sowie

Fig. 11

eine Draufsicht auf ein Blech zur Herstellung eines in Umfangsrichtung gesehen zweistückig ausgebildeten Haltesegmentes sowie eine schräge Draufsicht auf ein fertig gebogenes Haltesegment ohne Eckbleche.

In the following, an embodiment of the invention shown in the drawings will be explained. Show it:

Fig. 1

an oblique top view of a fire damper according to the invention including the details A and B,

Fig. 2

the object after Fig. 1 without gussets including detail A,

Fig. 3

the object after Fig. 1 without gussets and not yet connected,

Fig. 4

an illustration of the bending operation and the subsequent closing in a circumferentially integrally formed housing segment including the detail A,

Fig. 5

a plan view of a metal sheet for producing a circumferentially integrally formed connection segment and an oblique plan view of a finished bent connection segment without gussets,

Fig. 6

a plan view of a metal sheet for producing a holding segment formed integrally formed in the circumferential direction and an oblique plan view of a finished bent retaining segment without gussets,

Fig. 7

in an abstract manner, the cross-sectional profile along the line VII in FIG Fig. 1 including the details Y,

Fig. 8

in an abstract manner, the cross-sectional profile along the line VIII in Fig. 1 including the details Z,

Fig. 9

an oblique top view of a fire damper according to the invention without gussets and in the not yet connected state, wherein the retaining segment is seen in its circumferential direction formed in two pieces,

Fig. 10

an illustration of the bending process and the subsequent closing in a two-piece seen in its circumferential direction trained holding segment including the details A and B as well

Fig. 11

a plan view of a sheet metal for the preparation of a two-piece in the circumferential direction formed holding segment and an oblique plan view of a finished bent retaining segment without gussets.

In all figures the same reference numerals are used for identical or similar components.

In the Fig. 1 to 11 a fire damper is shown, which consists of three housing segments, namely two connection segments 1 and a holding segment 2 arranged therebetween. In the holding segment 2, a butterfly valve 3 mounted centrally about a pivot axis is provided, wherein the housing of the fire damper has a free cross-section, which is formed as a rectangular cross-section.

Each housing segment consists of four sections arranged at right angles to each other and is manufactured separately. Subsequently, the housing segments will be connected together. The fire damper is therefore formed in the illustrated embodiment in the longitudinal direction (flow direction 4) seen in three parts.

As can be seen from the drawings, one end of each terminal segment 1 is connected to one end of the retaining segment 2. The respective other end of each terminal segment 1 is designed for mounting the fire damper to a non-illustrated on-site ventilation system.

As far as the two terminal segments 1, may on the Fig. 4 and 5 to get expelled. As can be seen, a sheet is bent at four longitudinal transformations 5, wherein the two free ends are then connected to each other, for example by a longitudinal seam 6. In the upper part of Fig. 5 the sheet is shown before the bending process.

To produce two flanges 7, the side edges of the metal sheet of each connection segment 1 are angled at 90 °, preferably before bending along the longitudinal transformations 5. The respective free end of each flange 7 is in turn angled approximately 90 ° along a line 8 in the direction of the other flange 7 of the connection segment 1 to form a web 9.

Like the upper part of Fig. 5 can be seen, is provided on the web 9 of the flange 7 of the terminal segment 1, which is designed for mounting the fire damper to an on-site ventilation system, not shown, a reinforcing portion 10 which is shaped so that the reinforcing portion 10 on the inside of the finished bent Flange 7 is applied.

In the upper part of Fig. 6 is not yet bent sheet metal for the preparation of a circumferentially integrally formed holding segment 2 shown. Again, the two side edges are bent to form each of a flange 11 by about 90 ° - preferably before carrying out the bending of the sheet along the three longitudinal transformations 5. The respective free end of each flange 11 is in turn about 90 ° along the line 12 in the direction of the adjacent connection segment 1 to form a web thirteenth angled. Thus, the two webs 13 are aligned pointing away from each other in the holding segment 2.

In the region of two opposite sides of the retaining segment 2, a central bearing 14 for the pivot axis of the butterfly valve 3 is provided in each case. In addition, a partial region 15 which extends along the circumference of the shut-off flap 3 in the closed state and is delimited on both sides is provided, which is designed as an outwardly facing groove. This portion 15 is provided with a heat-expansive material, which is not shown in the present case. The width of the portion 15 corresponds at least outside the point of intersection between the retaining segment 2 and the bearing 14 in about the thickness of the butterfly valve 3. The portion 15 is used for chambering the heat-expanding material.

Due to the introduced portion 15, which forms an outwardly facing groove or bead on the bent and finished retaining segment 2, each of the three longitudinal deformations 5 is not formed in a straight line over the length L _{H of} the retaining segment 2. Rather, the longitudinal deformation 5 in the partial area 15 projects outwards relative to the other two adjacent longitudinal transformations 5 of the retaining segment 2, so that a partial area 15 is also provided in the area of each longitudinal deformation 5, ie in the immediate bending edge. The height of the portion 15 is therefore the same over the circumference of the retaining segment 2 at each point.

As in particular from the Fig. 1 and 2 As can be seen, the width B _{A of} each terminal segment 1 is greater than the width B _{H of} the retaining segment 2. The width B _{H of} the retaining segment 2 is the distance between the two opposite sides of the retaining segment 2 to each other, each containing the storage 15 of the butterfly valve 3.

Thus, the holding segment 2 protrudes in the region of these two sides into the flow cross section of the fire damper. In this way, a clearance for the butterfly valve 3, which is a pivoting of the butterfly valve 3 from the open position in the in Fig. 1 shown closed position is advantageous created.

In the FIGS. 7 and 8 is sketchy in an abstract way the cross-sectional profile along the line VII or VIII in Fig. 1 shown. As in Fig. 7 it can be seen, the height of the flange 11 of the retaining segment 2 and the height of the flange 7 of the terminal segment 1 are coordinated so that the web 13 of the flange 11 of the retaining segment 2 covers the web 9 of the flange 7 of the terminal segment 1 on the outside.

The flange 11 of the retaining segment 2 has - as in the FIGS. 7 and 8 shown - on all four sides no uniform height. Thus, the flange 11 in the region of the two sides ( Fig. 7 ), which contain the bearing (axle bearing) 15 for the butterfly valve 3, higher than in the area of the other two sides ( Fig. 8 ).

In contrast to the width, the height H _{A of} each terminal segment 1 is equal to the height H _{H of} the retaining segment 2 Fig. 3 can be seen, the two terminal segments 1 are longer than the retaining segment 2. Thus, the length L _{H of} the retaining segment, for example, be about 100 mm, while the length L _{A of} each terminal segment 1 is about 200 mm, so that this results in a total length of the fire damper of about 500 mm.

The free corner regions of each housing segment, which remain after bending along the longitudinal transformations 5, can each be filled with a gusset 16, which, for example, in the details A and B in FIG Fig. 1 is shown.

As Fig. 1 can be seen, have the corner plates 16 of the flange 7, which is designed for mounting the fire damper to a non-illustrated on-site ventilation system, a hole 17 for a fastener, such as a screw on. This is not absolutely necessary with the corner plates 16 of the flange 7, which is connected to one end of the retaining segment 2. Thus, the relevant end of the terminal segment 1 and the relevant end of the retaining segment 2, for example, be welded together.

According to the embodiment Fig. 6 is the retaining segment 2 seen in the circumferential direction integrally formed. After performing the bend along the three longitudinal transformations 5, the two free ends 18 are welded together, for example.

According to the embodiment Fig. 10 the retaining segment 2 is formed in two parts. Each housing part has the general configuration of an angle and has two longitudinal deformations 5. The two angles are fixed in the region of their free ends 18, for example, by a longitudinal seam 6 applied by welding.

The corresponding metal sheet for producing a holding segment 2 formed in the circumferential direction is formed in the upper representation of FIG Fig. 11 shown in more detail.

Of course, another embodiment of a circumferentially multi-piece housing segment is conceivable. For example, a sheet may be bent along two longitudinal formations 5 to form a U-shaped casing segment, with the fourth side, i. the open side is then closed by a corresponding side part.

Claims (15)

1. Fire protection flap with a housing and a pivotable shut-off valve (3) which can be pivoted therein around a pivoting axle, in particular a central pivoting axle, wherein the housing exhibits a free flow cross-section which is configured as a rectangular clear cross-section, characterised in that the housing, seen in the longitudinal extension, consists of at least two joined housing segments, and wherein one housing segment of these at least two housing segments is configured as a holding segment (2) for accommodating the bearing arrangement (14) of the pivoting axle, and at least one further housing segment of these at least two housing segments is configured as a connection segment (1) for the connection of the fire protection flap to a ventilation system, and wherein, in addition, one end of each connection segment (1) is connected to one end of the holding segment (2), and the other end of each connection segment (1) is each case is configured for the mounting of the fire protection flap on a building ventilation system, wherein the width B_H of the free flow cross-section between the axle bearings (15) of the holding segment (2) along the entire length L_E, seen in the flow direction, is smaller than the width B_A of the free flow cross-section, according to the alignment, in the region of each connection segment (1).
2. Fire protection flap according to the preceding claim, characterised in that the height H_H of the free flow cross-section of the holding segment (2) and the height H_A of the free flow cross-section correspond in the region of each connection segment (1).
3. Fire protection flap according to any one of the preceding claims, characterised in that the height H_H of the free flow cross-section of the holding segment (2) and the height H_A of the free flow cross-section correspond along the entire length, seen in the flow direction (4).
4. Fire protection flap according to the preceding claim, characterised in that the height H_H of the holding segment (2) is one to eight times greater than the length L_H of the holding segment (2), seen in the flow direction (4).
5. Fire protection flap according to the preceding claim, characterised in that the spacing interval between the pivoting axle and the outer end of the shut-off valve (3) is less than the spacing interval between the pivoting axle and the free end of the connection segment (1).
6. Fire protection flap according to the preceding claim, characterised in that the free other end of the connection segment (1) is configured for connection to a building ventilation system.
7. Fire protection flap according to the preceding claim, characterised in that the two free ends of the holding segment (2) are in each case joined to a connection segment (1).
8. Fire protection flap according to the preceding claim, characterised in that a flange (7, 11) is provided at the end of a housing segment which is connected to the end of an adjacent housing segment, for the purpose of this connection, said flange being in particular circumferential and extending outwards.
9. Fire protection flap according to the preceding claim, characterised in that at least two adjacent housing segments are connected by means of a joint connection.
10. Fire protection flap according to the preceding claim, characterised in that at least one housing segment is configured as multi-part, seen in its circumferential direction.
11. Fire protection flap according to the preceding claim, characterised in that at least one part surface of at least one housing segment is configured as being of one piece with at least one further part surface of this housing segment, adjacent to it in the circumferential direction.
12. Fire protection flap according to the preceding claim, characterised in that at least one housing segment, seen in its circumferential direction, is configured as being of one piece, and comprises at least three longitudinal reshaping sections (5) and a longitudinal seam (6).
13. Fire protection flap according to the preceding claim, characterised in that the holding segment (2) comprises a part region (15), extending along the length of the circumference of the shut-off valve (3) in its closed state, and delimited on both sides, configured in particular as a slot, which is provided with a material which expands under the effect of heat, and the width of which, at least outside the point of intersection between the holding segment (2) and the pivoting axle of the shut-off valve (3) preferably corresponds approximately to the thickness of the shut-off valve (3).
14. Fire protection flap according to the preceding claim, characterised in that a seal is provided between two connected housing segments.
15. Fire protection flap according to any one of claim 1-14, characterised in that the housing segments are manufactured separately and then connected to one another, wherein at least one part surface of at least one housing segment is configured as being of one piece with at least one further part surface adjacent in the circumferential direction.

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