EP2080537A1 - Fire protection flap - Google Patents

Abstract

The damper has housing for a shut-off valve (3), which is rotatably supported on a rotational axis. The shut-off valve includes an area (9), which projects into a gap (7), and radially extends over a circumference laterally within an area of the rotational axis, in such a manner that the movement gap between the shut-off valve and a material is clearly small than in other areas, within the area of the rotational axis.

Description

The invention relates to a fire damper with a housing for a pivotally mounted therein on a pivot axis butterfly valve, wherein the housing has a provided with a heat-expansive material portion, said portion is provided along the circumference of the shut-off valve located in the closed state, and preferably on both sides limited, in particular designed as a groove, and wherein in the housing and in the material at least one passage for the pivot axis is provided and the width of the material preferably at least approximately equal to the thickness of the butterfly valve and wherein in the closed state of the butterfly valve between the outer edge of the Shut-off valve and the inner surface of the material, which has not yet expanded by the action of heat, a circumferential movement gap is provided. The heat-expanding material thus forms an annular circumferential band which is provided in the arranged on the inside of the housing portion.

Such fire dampers are known in practice in various designs. Usually, the butterfly valve is mounted on a shaft or pivot axis, which is pivotally mounted in two bushings, which are arranged in opposite areas of the housing. Other bearings are of course possible.

The heat-expanding intumescent material is arranged on the inside of the housing in the effective range with the shut-off valve in the closed position. In case of fire, the material expands, so that the manufacturing and construction conditionally existing and circumferential movement gap, which is provided between the outer edge of the butterfly valve and the housing is sealed. This ensures that a possible fire and / or the resulting flue gases can not (or can not) flow into areas of an air-conditioning system not previously affected by the fire. A problem with such shut-off valves proves the seal in the region of the pivot axis relative to the housing, since less material is provided here due to the implementation required for the pivot axis and therefore the insulation effect can be reduced in these areas. This has an effect particularly on fire dampers with swivel axes large diameter.

The object of the invention is to improve the protective function of the fire damper.

This object is achieved in that the butterfly valve in the region of the pivot axis laterally over the circumference radially extending, encompassed by the respective pivot axis and hineinerstreckende in projecting areas, so that in the region of the pivot axis of the movement gap between the butterfly valve and the material that is not affected by heat has expanded considerably narrower than in the other areas. Due to the above range, the proportion of material reduced by the pivot axis is compensated in the region of each bearing point. The projecting region extends annularly around the pivot axis. As heat-expanding material, an intumescent material may be provided.

In this case, a, in particular soft rising, transition region may be provided by the peripheral surface of the butterfly valve to the projecting area. The end face of the projecting portion may lie in a plane approximately orthogonal to the longitudinal extent of the pivot axis. The transition region can be inclined or curved in the direction of the pivot axis. Thus, in such an embodiment, no step is provided from the peripheral surface of the butterfly valve to the projecting portion.

At least one projecting area may have a rotationally symmetrical end face. Alternatively it can also be provided an angularly shaped end face.

In this case, a, in particular soft rising, transition region may be provided to the end face.

At least one end face may lie in a plane oriented approximately orthogonally to the longitudinal extent of the pivot axis. Also seen in the direction of the pivot axis arched design of the end face is conceivable, wherein the radius of this curvature may be smaller but also larger than the radius of the housing.

At least one projecting region may have a rotationally symmetrical cross section. Of course, an angular embodiment is conceivable.

The end face of at least one rotationally symmetrical projecting region can be in contact with the material, which has not yet been expanded by heat, in two points located approximately in opposite regions of the projecting region, in particular only in slight contact. It is obvious that the respective points related to the above range are dependent on the orientation of the butterfly valve.

At least one projecting area of the shut-off flap can be formed in one piece with the shut-off flap.

In a solution according to the invention, the quotient of the volume V ₂ to the volume V _{4 is} at least approximately equal to the quotient of the volume V ₁ to the volume V ₅ .

Fig. 1

eine Draufsicht auf eine in einem Gehäuse gelagerte Absperrklappe in der Schließstel- lung,

Fig. 2

eine Detailansicht auf eine Lagerstelle der Absperrklappe einer alternativen Ausgestal- tung,

Fig. 3

den Bereich einer Lagerstelle einer erfindungsgemäßen Absperrklappe ohne eine La- gerbuchse in einem vergrößerten Maßstab und

Fig. 4

eine alternative Ausgestaltung des Gegenstan- des nach Fig. 2.

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

Fig. 1

a top view of a valve mounted in a housing shut-off valve in the closed position,

Fig. 2

a detailed view of a bearing point of the butterfly valve of an alternative embodiment,

Fig. 3

the area of a bearing of a butterfly valve according to the invention without a lager gerbuchse on an enlarged scale and

Fig. 4

an alternative embodiment of the object according to Fig. 2 ,

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

The fire damper shown in the figures has a housing 1 with a butterfly valve 3 pivotally mounted therein on a pivot axis 2. For storage 1 two bushings 4, each with a bearing bush 4a are provided in the housing, which are guided from the inside through the respective passage 4 to the outside. The left bearing bush 4a is closed at the end and the right bearing bush 4a is open at the end. Each bearing bush 4a is secured on the outside by a securing ring 5.

On the inside of the housing 1, a circumferential portion is provided in which a material 6 expands under heat is provided, which expands in case of fire and closes a gap or movement gap 7 between the outer edge of the butterfly valve 3 and the housing 1.

The butterfly valve 3, except in the region of the pivot axis 2 has a round cross-section. In the region of the pivot axis 2, it has on both sides in each case a laterally over the circumference, which is indicated in this area as a dashed line 8, radially extending, from the respective pivot axis 2 and durchfasst in the Gap or movement gap 7 hineine extending projecting area 9.

Thus, in the region of the pivot axis 2 of the movement gap 7 between the butterfly valve 3 and the material 6, which has not yet expanded by the action of heat, significantly narrower than in the other areas.

In the in the Fig. 1 to 3 illustrated embodiment, a soft rising transition region 10 is provided by the peripheral surface 11 of the butterfly valve 3 to the projecting portion 9. In Fig. 2 the protruding region 9 with a polygonal cross-section additionally has a further rotationally symmetrical end face 12, whereby a softly rising transition region 13 is also provided towards the end face 12. The end face 12 has an approximately orthogonal to the longitudinal extent of the pivot axis 2 aligned plane.

In Fig. 4 an embodiment is shown in which no transition region is provided. Rather, the protruding region 9 is opposite to the peripheral surface 11 by a step. The projecting area 9 in this case has a rotationally symmetrical cross section.

In such a rotationally symmetrical cross section according to Fig. 4 For example, the projecting portion 9 is usually in contact with the non-heat expanded material 6 at two points A and B, and C and D, which are located approximately in opposite portions of the projecting portion 9. If the butterfly valve 3 is in the open position, the protruding area 9 touches the material 6 in points A and B. In the closed position of the butterfly valve 3, the material 6 is not yet expanded State in points C and D with the protruding portion 9 in contact.

FIG. 3 shows on an enlarged scale the area of a bearing, wherein volumes V ₁ to V _{6 are} drawn, which are composed as follows:

The volume V ₁ is the volume between the expansive material 6 and the protruding portion 9 of the butterfly valve 3.

The volume V ₂ is the volume between the heat-expansive material 6 and the butterfly valve 3 outside the protruding portion 9 of the butterfly valve 3.

The volume V ₃ is the volume occupied by the pivot axis 2, which is laterally surrounded by the expansive material 6 when exposed to heat.

The volume V ₄ is the existing foaming volume of the heat-expending material 6 outside the projecting portion 9 of the butterfly valve. 3

The volume V ₅ is the existing foaming volume of the expanding material 6 on exposure to heat in the protruding area 9 of the butterfly valve 3.

• Das Volumen V₆ ist das durch die Schwenkachse 2 eingenommene Volumen, das seitlich durch das Volumen 1 begrenzt ist.

$$V_1=s*t*x_1-V_6$$

$${\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">V</figure-callout>}}_2=s*t*x_2$$

$${\mathrm{<figure-callout\; id="3"\; label="V"\; filenames="imgf0002.png,imgf0003.png"\; state="\{\{state\}\}">V</figure-callout>}}_3=\frac{{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">d</figure-callout>}}^2*\pi }{4}*Y$$

$$V_4=s*t*\mathrm{<figure-callout\; id="5"\; label="y\; V"\; filenames="imgf0001.png"\; state="\{\{state\}\}">y</figure-callout>}$$

$$V_{}$$$${}_5=V_4-\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">d</figure-callout>}}^2*\pi }{4}*y\right)=s*t*y-V_3$$

$${\mathrm{<figure-callout\; id="6"\; label="V"\; filenames="imgf0003.png"\; state="\{\{state\}\}">V</figure-callout>}}_6=\frac{{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">d</figure-callout>}}^2*\pi }{4}*x_1$$

s =

Breite der Vergleichsfläche der Absperrklappe 3

t =

Dicke der Absperrklappe 3

X₁ =

Spaltbreite des Bewegungsspaltes 7 zwischen dem bei Wärmeeinwirkung ausdehnenden Material 6 und dem vor- stehenden Bereich 9 der Absperrklappe 3

X₂ =

Spaltbreite des Bewegungsspaltes 7 zwischen dem bei Wärmeeinwirkung ausdehnenden Material 6 und der Ab- sperrklappe außerhalb des vorstehenden Bereichs 9 der Absperrklappe 3

d =

Durchmesser der Schwenkachse 2

y =

Dicke des bei Wärmeeinwirkung ausdehnenden Materials 6

The volumes V ₁ to V ₆ can be determined approximately as follows using the following equations:

• The volume V ₆ is the volume occupied by the pivot axis 2, which is bounded laterally by the volume 1.

$$V_1=s*t*x_1-V_6$$

$${\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">V</figure-callout>}}_2=s*t*x_2$$

$${\mathrm{<figure-callout\; id="3"\; label="V"\; filenames="imgf0002.png,imgf0003.png"\; state="\{\{state\}\}">V</figure-callout>}}_3=\frac{{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">d</figure-callout>}}^2*\pi }{4}*Y$$

$$V_4=s*t*\mathrm{<figure-callout\; id="5"\; label="y\; V"\; filenames="imgf0001.png"\; state="\{\{state\}\}">y\; </figure-callout>}$$

$$V_{}$$$${}_5=V_4-\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">d</figure-callout>}}^2*\pi }{4}*y\right)=s*t*y-V_3$$

$${\mathrm{<figure-callout\; id="6"\; label="V"\; filenames="imgf0003.png"\; state="\{\{state\}\}">V</figure-callout>}}_6=\frac{{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">d</figure-callout>}}^2*\pi }{4}*x_1$$

s =

Width of the comparison surface of the butterfly valve 3

t =

Thickness of the butterfly valve 3

X ₁ =

Gap width of the movement gap 7 between the material 6 expanding upon exposure to heat and the protruding region 9 of the butterfly valve 3

X ₂ =

Slit width of the movement gap 7 between the heat-expending material 6 and the shut-off valve outside the projecting portion 9 of the butterfly valve. 3

d =

Diameter of the pivot axis 2

y =

Thickness of the expansive material 6

In a preferred embodiment of the invention, approximately the following relationship is given: $$\frac{V_2}{V_4}\cong \frac{V_1}{{\mathrm{<figure-callout\; id="5"\; label="V"\; filenames="imgf0001.png"\; state="\{\{state\}\}">V</figure-callout>}}_5}$$

In Fig. 3 the bushing 4 is not shown for the sake of clarity. In practice, the bushings 4 arranged so that the collar of each bearing bush 4, as it is in Fig. 1 is shown, rests on the inner surface of the expansible material 6 upon exposure to heat.

In case of fire, the material 6 expands when exposed to heat at about 140 ° C and thus later than the existing already at about 100 ° C plastic bushing 4, so that the bearing bush 4 is already melted away at the time of reacting the expansive material 6.

Claims (9)

Fire damper with a housing (1) for a butterfly valve (3) pivotally mounted therein on a pivot axis (2), said housing (1) having a portion provided with a heat expending material (6), said portion being along the circumference the shut-off flap (3) located in the closed state is provided and preferably bounded on both sides, in particular as a groove, and wherein at least one passage (4) for the pivot axis (2) is provided in the housing (1) and in the material (6) is and the width of the material (6) preferably at least approximately the thickness of the butterfly valve (3) corresponds and wherein in the closed state of the butterfly valve (3) between the outer edge of the butterfly valve (3) and the inner surface of the material (6), which has not yet extended by the action of heat, a circumferential movement gap (7) is provided, characterized in that the butterfly valve (3) in the region of Schwen 2. The projecting regions (9) extending laterally over the circumference of the circumference and extending radially from the respective pivot axis (2) and extending into the gap (7), so that the movement gap (7) in the region of the pivot axis (2) between the butterfly valve (3) and the material (6), which has not yet expanded by the action of heat, is significantly narrower than in the other areas. Fire damper according to the preceding claim, characterized in that a, in particular soft rising, transition region (10) from the peripheral surface (11) of the butterfly valve (3) to the projecting portion (9) is provided. Fire damper according to one of the preceding claims, characterized in that at least one projecting region (9) has a rotationally symmetrical end face (12). Fire damper according to one of claims 2 or 3, characterized in that a, in particular soft rising, transition region (13) is provided to the end face (12). Fire damper according to one of claims 3 or 4, characterized in that at least one end face (12) is in an approximately orthogonal to the longitudinal extent of the pivot axis (2) aligned plane. Fire damper according to one of the preceding claims, characterized in that at least one projecting region (9) has a rotationally symmetrical cross section. Fire damper according to the preceding claim, characterized in that the end face (12) of at least one rotationally symmetrical projecting portion (9) in two located approximately in opposite regions of the above range points (A and B or C and D) with the still non-exposed material (6) is in contact, especially only slightly in contact. Fire damper according to one of the preceding claims, characterized in that at least one projecting region (9) of the butterfly valve (3) is formed integrally with the butterfly valve (3). Fire damper according to one of the preceding claims, characterized in that the quotient of the volume V ₂ to the volume V ₄ at least approximately corresponds to the quotient of the volume V ₁ to the volume V ₅ .

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