Fire protection device with a fire damper

Abstract

Fire protection device with a fire damper (14) arranged in a wall opening, which has a housing (16) made of metal which is at least partially surrounded by a casing (32) made of a non-metallic, fire-resistant material, characterized in that there is a gap between the reveal (12) of the wall opening and the outer surface of the casing (32), which gap is filled with an intumescent fire protection compound (36).

Description

[0001] The invention relates to a fire protection device with a fire damper arranged in a wall or ceiling opening, which has a housing made of metal which is at least partially surrounded by a casing made of a non-metallic, fire-resistant material.

[0002] Fire dampers are installed in ventilation ducts so that in the event of a fire, the damper can be closed to prevent the spread of fire or smoke.

[0003] EP 3 047 778 B1 describes a fire protection device comprising a fire damper fitted into an opening in a building wall made of timber construction materials. The casing of the fire damper has a shroud which fills the space between the outer perimeter of the fire damper and the reveal of the wall opening. This not only prevents the spread of heat and gases through this space, but also provides better protection for the reveal of the building wall against combustion. If the length of the shroud is less or greater than the thickness of the building wall, the shroud or the building wall is supplemented with an attachment to maximise the length of the gap between the shroud and the reveal of the wall opening, so that the fire takes longer to spread through this gap.

[0004] The object of the invention is to create a filing of this type that is easier to install.

[0005] This object is achieved according to the invention in that there is a gap between the reveal of the wall opening and the outer surface of the casing, which gap is filled with an intumescent fire protection compound.

[0006] Intumescent fire protection compounds are commercially available and, similar to polyurethane construction foam, can be injected from a cartridge into joints between building components that need to be sealed, where they then expand and fill the joint. However, the expansion of the fire protection compound creates less pressure than polyurethane foam, reducing the risk of damage to sensitive building components. Furthermore, the fire protection compound is intumescent, meaning it expands further in the event of a fire due to the heat, thus creating a more secure seal.

[0007] According to the invention, the casing does not need to be precisely adapted to the internal dimensions of the wall opening. Instead, the gap is filled with fire protection compound. This significantly reduces the accuracy requirements for manufacturing the casing and also for creating the wall opening, making the device easier and more cost-effective to install. When the fire protection compound initially swells, part of this compound will ooze out of the space between the fire damper and the reveal of the wall opening. After it has solidified, this part of the fire protection compound can be cut off and removed with a knife, creating a flat surface. The fire protection compound can also be used to bridge larger gaps with a width of up to 80 mm, meaning that the wall opening can be created very roughly, for example with a chainsaw, and a reliable seal can still be achieved.

[0008] Advantageous embodiments and further developments of the invention are specified in the subclaims.

[0009] The firestop compound can fill the gap between the cladding and the reveal along the entire thickness of the wall. The device can be installed in walls of varying thickness without requiring any special adjustments to the fire damper or the cladding. There are no specific requirements regarding the contour shape of the wall / ceiling opening in which the fire damper is installed, which can be quite irregular or inaccurate.

[0010] The device can be installed in wooden walls, in lightweight plasterboard walls with a supporting structure made of metal studs or wooden studs, or in solid walls made of concrete or masonry.

[0011] The following examples are explained in more detail with reference to the drawings. They show: Fig. 1 a partial section through a building wall with a fire protection device in the form of a fire damper which is inserted into a wall opening; Fig. 2 a view from the direction of arrows II-II in Fig. 1; and Fig. 3 a fire protection device in a lightweight wall.

[0012] According to Fig. 1, a solid building wall 10, which may be made of wood, for example, has an opening defined by a reveal 12 into which a fire damper 14 is inserted. The fire damper has a tubular or duct-shaped housing 16 made of sheet metal, which protrudes from the wall opening on both sides and forms a connecting flange 18 at each end, which allows connection to a ventilation duct (not shown). In the area of ​​the wall opening, the housing 16 has a constriction 20. Inside the housing 16, in the area of ​​this constriction 20, a damper blade (not shown) is arranged, which can pivot about an axis running diametrically through the housing 16. A cover 22 conceals the end of this axis as well as a drive rod that connects the axis to a drive 24 for the damper blade.When the damper blade is oriented approximately parallel to the longitudinal axis of the housing 16, the damper is open and air can flow along both sides of the damper blade. With the help of the drive 24, the damper blade can be pivoted into a position in which it completely closes the inner cross-section of the constriction 20. On both sides of the constriction 20, the fire damper has a circumferential stiffening element 26 and 28, respectively. Using the stiffening elements and associated retaining webs 30, the fire damper can be attached to the building wall 10.

[0013] The fire damper 14 is surrounded by a casing 32 made of fire-resistant and heat-resistant material in the area of ​​the constriction 20. Specifically, the casing 32 in this example is formed by an inner ring located in the constriction 20 and whose outer diameter is flush with the outer wall of the housing 16, and an outer ring that completely covers the constriction 20 and the inner ring. On the side of the stiffening element 28, the seat of the housing 16 in the wall opening is stabilized by retaining brackets 34, which are attached with one leg to the wall surface of the building wall 10 and with the other leg hold the outer edge of one of the connecting flanges 18. The annular or circumferential space between the reveal 12 and the outer peripheral surface of the casing 32 is filled with an intumescent fire protection compound 36, so that the wall opening outside the fire damper 14 is sealed gas-tight.

[0014] During installation of the fire damper, the housing 16 is first mechanically secured in the wall opening using the stiffening elements 26, 28. The fire protection compound is then injected from a cartridge into the space between the casing 32 and the reveal 12. A propellant contained in this fire protection compound causes it to foam until it completely fills this space. Once the foamed compound has hardened, any excess material can be trimmed off with a knife, leaving only the portion of the fire protection compound 36 that fills the space between the stiffening elements 26, 28 and the reveal 12.

[0015] In the Fig. In the example shown in Figure 1, the end face of the fire protection compound 36 on the side of the stiffening element 26 is approximately flush with the surface of the building wall. However, the distance between the stiffening elements 26 and 28 is smaller than the thickness of the wall, resulting in a conical end face on the side of the stiffening element 28.

[0016] In the example shown, the inner diameter of the wall opening defined by the reveal 12 is larger than the outer diameter of the connecting flanges 18 and the stiffening elements 26, 28, so that these flanges and stiffening elements can be pushed through the wall opening during installation until the Fig. 1 is reached. The fire damper, including the stiffening elements 26, 28, can thus be prefabricated and does not need to be specially adapted to the thickness of the building wall 10 and the diameter of the wall opening.

[0017] The fire protection compound 36 not only provides reliable sealing at the joint formed by the reveal 12 and the joint formed by the constriction 20, but also mechanically stabilizes the arrangement of the fire damper in the wall opening. Since the fire protection compound is an intumescent material, in the event of a fire, when the fire protection compound 32 is exposed to greater heat, this compound swells further, further enhancing its sealing effect. In particular, the intumescent fire protection compound swells over the perimeter of the reveal 12 on both sides of the wall, providing even better protection against fire attack.

[0018] Fig. 2 shows the fire damper according to Fig. 1 in a view from the direction of arrows II-II in Fig. 1. From the casing 36 is in Fig. 2 only the outer edge can be seen, since the inner part as well as the stiffening element 26 are covered by the connecting flange 18. A ventilation pipe 38 with a square cross-section, which connects to the connecting flange 18, is shown in Fig. 2 in section. Within the cross-section of this ventilation pipe, one can see the inner surface of the constriction 20 as well as a damper blade 40, which is here in the open position. Also visible are the retaining webs 30, which overlap the edge of the casing 32 and are fixed further inside to the stiffening element 26 (not visible here). The front surface of the fire protection compound 36 is in Fig. 2 hatched for clarity. It can be seen that the reveal 12 in this example has a very irregular shape, as the wall opening was only roughly machined. This is possible because the fire protection compound 36 completely fills the space between the reveal 12 and the cladding 34.

[0019] Fig. 3 shows a similar fire damper 14' as Fig. 1, but installed in a building wall 10' with a smaller thickness. Here, too, the fire protection compound 36 completely fills the space between the reveal 12 and the casing 32 enclosed between the stiffening elements 26, 28, so that the reveal 12 is protected against fire attack along its entire length. However, since the thickness of the wall in this case is smaller than the distance between the stiffening elements 26, 28, the fire protection compound is limited on the side of the stiffening element 28 by a conical surface that tapers outward.

[0020] In this example, the building wall 10' is a lightweight wall with a stud frame made of U-shaped metal profiles 44 and lined on both sides with plasterboard 46. The reveal of the wall opening is formed primarily by a frame made of metal profiles 44.

[0021] In the illustrated embodiments, the housing 16 has a square cross-section. However, the housing could also have a different cross-section, for example, a circular one.

[0022] The fire protection compound 36 adheres well to a wide variety of materials, so the fire damper installation method shown here can also be implemented in concrete or masonry walls, for example. Alternatively, the fire damper can also be suspended from a ceiling. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 3 047 778 B1

[0003]

Claims

[1] Fire protection device with a fire damper (14) arranged in a wall opening, which has a housing (16) made of metal which is at least partially surrounded by a casing (32) made of a non-metallic, fire-resistant material, characterized by , that between the jamb (12) of the wall opening and the outer surface of the casing (32) there is a gap which is filled with an intumescent fire-resistant compound (36). [2] Device according to claim 1, wherein the fire damper (14) has a housing (16) with at least one stiffening element (26) which is held on the building wall (10) forming the wall opening by means of retaining webs (30). [3] Device according to claim 2, wherein the housing (16) has two stiffening elements (26, 28) arranged at a distance from each other and the fire-resistant compound (32) completely fills the space between the stiffening elements. [4] Device according to claim 3, wherein the distance between the stiffening elements (26, 28) differs from the thickness of the building wall (10; 10') and the fire-resistant mass (32) covers the jamb (12) of the wall opening over its entire depth. [5] Device according to one of the preceding claims, wherein the length of the casing (34) differs from the thickness of the building wall (10'; 10") forming the wall opening and the fire-resistant compound (32) covers the jamb (12) of the wall opening over its entire depth. [6] Device according to one of the preceding claims, wherein the jamb (12) of the wall opening has an irregular shape.

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