AT513183A1 - Shut-off device for closing a flow channel - Google Patents

Abstract

The present invention discloses a shut-off device (1) for closing a flow channel for air and / or gaseous media, comprising a flap housing (2) with a flap housing channel (4) and a butterfly valve (10) in the flap housing channel (4) on a Swivel axis (14) is pivotally mounted. Along the periphery of the butterfly valve (10), a seal (12) is arranged. The shut-off flap (10) is pivotable between an open position and a closed position, wherein in the open position of the butterfly valve (10) the flap housing channel (4) is flow-permeable, and wherein and in the closed position of the butterfly valve (10) this the flap housing channel (4) vorschluss, so that the flap housing channel (4) is impermeable to flow. According to the invention, the shut-off device (1) comprises a Bourdon spring (30) filled with an expansion medium, which is connected to the flap housing (2) and is coupled in a motion-coupled manner to the shut-off flap (10). If a predetermined temperature of the expansion medium is exceeded, the volume of the expansion medium increases such that the Bourdon spring (30) develops a torque which converts the shut-off flap (10) into the closed position, and if the temperature of the expansion medium falls below the predetermined value, the volume of the expansion medium decreases such that the Bourdon spring (30) develops a torque which converts the shut-off flap (10) into the open position.

Description

Shut-off device for closing a flow channel

The present invention relates to a shut-off device for closing a flow channel according to the preamble of claim 1.

Shut-off devices for closing a flow channel are also referred to as fire dampers. Fire dampers are used for example in ventilation ducts and flue ducts that represent flow channels and connect individual rooms or building sections with each other and / or, for example, with a ventilation or air conditioning.

In normal operation, air, or more generally a gaseous medium, should be impeded as little as possible in its flow between two rooms or building sections by means of a fire damper inserted or installed in a flow duct. However, in the event of a fire or smoke in a room or in a section of a building, a fire damper should allow for the exchange of air or gaseous media between the air and the gaseous media between the air and the gaseous media. [• •] • • • • • • • • • ···························································································································································································································· and / or can not spread smoke from one room to one over the flow channel with that connected room.

A fire damper typically includes a damper housing with a damper housing duct and a butterfly valve pivotally mounted therein about a pivot axis. The butterfly valve is pivotable between an open position in which the fire damper is flow-permeable, and a closed position in which the fire damper is fluid-impermeable. To improve the sealing effect in the closed position, a seal is usually arranged on the circumference of the butterfly valve, by means of which a necessary gap between the periphery of the butterfly valve and the inner wall of the valve body to be sealed in the closed position of the butterfly valve. In addition, a flexible band of intumescent material may be provided on the inner wall of the flap housing, which comprises, for example, expanded graphite base, and which foams under high pressure under the action of heat and forms a pressure-resistant foam in the event of fire.

To transfer the butterfly valve between the open position and the closed position and vice versa, according to the prior art, a drive motor can be used, which is coupled to the movement of the butterfly valve. When a predetermined temperature (for example 72 ° C) is exceeded, which is determined by means of a temperature sensor connected to the drive motor or a control device, the drive motor develops a torque which converts the shut-off valve into the closed position. If only a cold smoke development was present, the 4/63

Damper does not destroy, so that falls below the predetermined temperature of the drive motor generates a shut-off valve in the open position converting torque. A corresponding shut-off device requires a temperature sensor, a drive motor and a control device connected to the temperature sensor and the drive motor, so that a corresponding shut-off device is labor-intensive and cost-intensive to manufacture.

From the prior art it is also known to bias the butterfly valve by means of an energy storage device (for example, a coil spring) in the direction of the closed position, wherein the butterfly valve is held by a holding device in the open position. The holding device comprises a melting solder, which melts when exceeding a predetermined temperature, so that the shut-off valve is no longer held in the open position by the holding device and is transferred by means of the force storage device in the closed position. If only a cold smoke development was present, in which the butterfly valve has not been destroyed, to restore the functionality of the shut-off the butterfly valve must be manually transferred to the open position and the holding device must be equipped with a new fusible link. This always requires a service technician.

The object of the present invention is to provide an improved fire damper which, in the closed position of the butterfly valve, reliably seals the damper housing duct, in which the butterfly damper in the event of a fire and / or the case of a cold smoke development can reliably be stored in ······ • · * ..... 4

Closed position is transferred, and in which the butterfly valve is automatically transferred to the end position after completion of a cold smoke development back into the open position. The object is achieved by a shut-off device for closing a flow channel for air and / or gaseous media having the features specified in claim 1. Advantageous embodiments of the invention are specified in the dependent claims. 10

More specifically, the shut-off device according to the invention comprises a filled with an expansion medium Bourdon spring, which is connected to the valve body and is coupled in movement with the shut-off valve. When exceeding 15 a predetermined temperature of the expansion medium, the volume of the expansion medium increases such that the Bourdon spring develops a valve opening in the closed position converting torque. On the other hand, when the temperature of the expansion medium falls below the predetermined temperature, the volume of the expansion medium decreases such that the Bourdon spring develops a torque which converts the butterfly valve into the open position. A Bourdon spring is a round bent bourdon tube with a cross-section other than the circular shape, such as, for example, an oval, elliptical or polygonal approximated cross-section that bends under pressure.

The shut-off device according to the invention has the advantage that the shut-off device independently and without the need for a control device with a temperature sensor and a drive motor, the shut-off in 6/63 in a predetermined temperature considered critical. ·· < • · • · • · • · · · · · · · · · · φ • "·· • · • · φφ • φφφ 5

Closed position, whereby an expansion of a fire or smoke is prevented by the ventilation system. At the same time a suitably designed shut-off device has the advantage that when sub-5 step the critically considered predetermined temperature the shut-off valve automatically moves back into the open position without, for example, a safety solder (holding device that melts when a predetermined temperature is exceeded) 10 replaced would have to be. The transfer of the butterfly valve in the open position is only possible if the butterfly valve has not been destroyed.

The Bourdon spring may be located either in the valve body passage 15 outside of the valve body.

Rectangular fire dampers have the disadvantage that at a certain angular position of the butterfly valve in the valve housing channel shortly before the closed position 20 of the butterfly valve, the circumferentially arranged seal over its entire two opposite transverse extensions simultaneously come into contact with the inner wall of the valve body, since the corresponding transverse sides of the butterfly valve straight (not curved). 25

This has the consequence that from the angular position of the butterfly valve, in which the seal with the inner wall of the valve body channel contact, for further pivoting of the butterfly valve in the closed position a very large torque must be applied, since the seal over its entire transverse extent to one deformed (compressed) must be, and on the other hand, the static friction between the seal and the inner wall of the flap housing channel must be overcome, with the static friction with the contact surface between the seal and the inner wall of the flap housing channel rises. On the other hand, to transfer the shut-off valve from the 5 closed position to the open position of the same

Reasons a very large torque can be applied. Therefore, an oversized An-10 drive motor must be used in a corresponding geometric design of the fire damper for a motorized pivoting of the butterfly valve.

Preferably, the flap housing channel and the butterfly valve each have elliptical cross-sections. The appropriately trained shut-off device for Ver close a flow channel for air and / or gaseous media, or briefly the fire damper according to the invention, achieves a reduction of the necessary torque for the transfer of the butterfly valve from the open-20 position to the closed position and vice versa, at the same time the cross-sectional area of the flap housing channel is increased compared to a fire damper with a circular cross section, so that the fire damper in the open position has a lower flow resistance.

Since both the flap housing channel and the butterfly valve each have elliptical cross-sections, the seal 30 arranged on the circumference of the butterfly valve contacts the valve housing channel only at two opposite points at a given angular position of the butterfly valve (near / close to the closed position). 8/63 7 7 ···················································································································································································

Shut-off valve in the direction of the closed position then successively more arcuate sealing portions come into contact with the valve housing channel, so that the torque required to close the butterfly valve slowly 5 and steadily increases, the torque required to overcome the static friction is constant and proportional to the contact surface steadily increases and at Approaching the closed position reaches its highest value, whereas the torque for overcoming the deformation of the sealing lip 10 is variable and only partially acts when swinging the butterfly valve and is not additive.

Further, the ratio of the circumference to the area enclosed by the Um-15 is smaller in an ellipse than in a rectangle or square, so that the applied torque for closing the butterfly valve having an elliptical cross-sectional geometry becomes smaller due to the smaller circumference is than with a butterfly valve with a rectangular cross-sectional geometry.

Due to the special design of the cross-sectional shape of the butterfly valve and the flap housing channel is for the transfer of the shut-off valve from the open position to the closed position and vice versa only a reduced torque necessary that can be easily generated by a correspondingly dimensioned Bourdon spring. Furthermore, a butterfly valve with an elliptical cross-sectional geometry has a large area, so that when installing the fire damper according to the invention in a rectangular or square flow channel 9/63 8 only a small constriction through the fire damper present, so that only small turbulence of the flow air are effected , so that the noise caused by turbulence noise is reduced by the invention according to 5 fire damper.

The flow channel can be a ventilation and / or extraction channel, a delivery channel or simply a wall opening. The flap housing 10 of the fire damper according to the invention can be connected to the flow channel, wherein in the connected state of the flap housing channel then forms a flow channel portion of the flow channel. The seal may be a circumferential sealing lip and / or a circumferential band, which foams when heated, so that a heat transfer and / or a smoke transport is reliably prevented. In addition, the outside of the valve body can be thermally insulated, wherein the thermal insulation can be done by a sheathing of the valve body with a thermally insulating material. The valve housing can also be interrupted by a thermal insulation in the middle in the middle of the valve axis, wherein by means of the thermal insulation, a heat transfer via the (metallic) valve housing from one room to the other 25 is prevented.

Preferably, the cross-sectional shape of the butterfly valve in the Cartesian coordinate system corresponds to the ellipse equation

X 30 - a

Where a and b are the semiaxes of the ellipse, x is the 10/63 9 x coordinate, y is the y coordinate, and n is a real number in the range of 10 £ n > Second

In the case of n = 2, the above-mentioned equation corresponds to the elliptic equation and the cross-sectional shape of the butterfly valve is elliptical. In the case of n > 2 corresponds to the cross-sectional shape of the butterfly valve, however, a so-called super ellipse. Super Ellipses interpolate ellipses and rectangles. The larger the exponent 10 n, the more the corresponding superellipse adapts to the rectangle with the transverse sides a and b, so that the cross-sectional area of the corresponding superellipse increases with increasing n and equalizes the cross-sectional area of the interpolated rectangle. Ellipses and all 15 super ellipses have the common feature that only at the four intersections of the ellipse curve with the coordinate axes, the curvature of the ellipses or super ellipse is zero. Thus, no ellipse and no super-ellipse on straight sections, so that the necessary torque 20 for the transfer of the butterfly valve from the open position to the closed position increases only gradually.

Preferably, the exponent n is in the range between 3 > n 25> 2. Furthermore, the exponent n may preferably be in the range 4 s n > Be 3. Furthermore, an exponent n is in the range of 5 £ n > 3 advantageous.

Preferably, the cross-sectional area of the flap body channel corresponds to the cross-sectional area of the flow channel.

In a corresponding embodiment, the air flow rate is not reduced by the shut-off device according to the invention, so that the noise development at the fire damper due to turbulence is maximally reduced. Furthermore, the suction power or capacity 5 is not affected by the installation of the fire damper according to the invention.

However, deviations of the cross-sectional areas of the valve body passage and the flow passage are also possible. 10 Cross-sectional areas may vary between 5% and 10%, between 10% and 15%, between 15% and 20%, between 20% and 30% and between 30% and 50%. In this case, either the cross-sectional area of the flow channel can be greater than the cross-sectional area of the flap housing channel or vice versa.

Preferably, the shut-off device comprises at least one transition piece connected to the flap housing, which has a transition channel. This transition channel 20 has a first cross-section, which corresponds to the cross section of the flap housing channel, on a side facing the flap housing. Furthermore, the transition channel on a side facing the flow channel has a second cross section which corresponds to the cross section of the flow channel 25. The transition piece is connectable to the flow channel in such a way that the transition channel forms a flow channel section.

By means of appropriately shaped transition pieces 30 turbulence of the air flow between the flow channel and the shut-off device can be reduced. Corresponding transition pieces can be arranged on the inlet side of the shut-off device and / or on the outlet side of the shut-off device. In this case, the transition pieces may have different cross-sectional shapes, which are adapted to the cross-sectional shapes of the flow channel on the input side and the output side of the shut-off device.

Preferably, the transition piece with the flap housing is positively and / or cohesively connected. In a corresponding embodiment of the shut-off device, the installation of the shut-off device in a correspondingly designed ventilation system is particularly simplified since the connection sides of the shut-off device are adapted to the flow channel. Furthermore, storage costs, procurement costs, assembly costs, packaging costs, transport costs and administrative costs for appropriately designed shut-off devices can be reduced since the shut-off devices do not have to be stored separately from the transition pieces.

Preferably, the transition piece is variable in its axial extent and thus flexible. Appropriately designed transition pieces are also referred to as compensators.

In a corresponding embodiment of the shut-off device, for example, caused by a heating changes in the length expansion of the flow channel can be compensated by these compensators without leaks between the flow channel and the shut-off occur.

Further advantages, details and features of the invention will become apparent from the illustrated embodiments. In detail: 13/63 12

Figure 1: A plan view of the shut-off device according to the invention; Figure 2 is a plan view of a modification of the shut-off device shown in Figure 1; Figure 3: A three-dimensional transparent representation of another embodiment of the shut-off device according to the invention, wherein the butterfly valve is in the open position; Figure 4A: The shut-off device shown in Figure 3 in plan view with transparent valve body. Figure 4B: The shut-off device shown in Figures 3 and 4A in frontal plan view; Figure 5: A three-dimensional transparent representation of the shut-off device shown in Figure 3, wherein the butterfly valve is in the closed position; Figure 6A: The shut-off device shown in Figure 5 in plan view with transparent valve body; Figure 6B: The shut-off device shown in Figures 5 and 6A in frontal plan view; FIG. 7 shows the shut-off device according to the invention in a three-dimensional perspective view; [0026] FIG. FIG. 8 is a drawing illustrating the approximation of the surface areas of a superellipse to the area of a rectangle; Figure 9A: A three-dimensional perspective Dar 10 position of a connectable with the shut-off transition piece; Figure 9B is a plan view of the transition piece shown in Figure 9A; Figure 9C is a side view of the transition piece shown in Figures 9A and 9B; Figure 10A: 20 Another embodiment of the shut-off device according to the invention with two transition pieces; FIG. 10B: a detailed representation of the area surrounded by a circle in FIG. 10A; FIG. 11 shows a further embodiment of the shut-off device according to the invention in plan view; FIG. 12 shows a three-dimensional perspective illustration of a manual drive / safety device; 15/63 14

FIG. 13 shows a cross-sectional view of the drive / securing device illustrated in FIG. 12; 5 Figure 14: A three-dimensional perspective Dar position of a triggering device;

Figure 15 is a cross-sectional view of a portion of the butterfly valve along the circumference of which a seal comprising two sealing segments is disposed; and

FIG. 16: a cross-sectional view of a

Flange profile. 15 20

In the following description, like reference numerals designate like components and like features, so that a description made with respect to a figure with respect to a component also applies to the other figures, so that a repetitive description is avoided.

Figure 1 shows a shut-off device 1 according to the invention in plan view, in which a butterfly valve 1 is in a closed position. The shut-off device 1 for

Closing a flow channel for air and / or gaseous media comprises a tubular flap housing 2 with a straight flap housing channel 4th The flap housing 2 is delimited by two parallel connection flanges 6. However, the flap housing 2 and thus also the flap housing channel 4 also have a bend, so that then the limiting connecting flanges are aligned at an arbitrary angle between 0 ° 16/63 15 and 90 ° to each other.

In the flap housing channel 4, a butterfly valve 10 is centrally rotatably mounted at two attachment points 14 (see FIG. 3) so that the butterfly valve 10 can be pivoted in the flap housing channel 4 about a pivot axis 14 defined by the attachment points 14 between an open position and a closed position. The shut-off device 1 comprises a Bourdon spring 30 filled with an expansion medium, which is connected to the flap housing 2 and is coupled in a motion-coupled manner to the shut-off flap 10. The Bourdon spring 30 is a round bent tube spring 30 with an oval cross section, which bends under internal pressure. The Bourdon spring 30 can be arranged either in the flap housing channel 4 or outside the flap housing channel 4 and thus on the outside of the flap housing 2. 20 When a predetermined temperature of the expansion medium, z. B. when exceeding 72 ° C, the volume of the expansion medium increases such that the Bourdon spring 30 develops a valve 10 in the closed position converting torque. FIG. 1 shows the shut-off device 1 in which the shut-off flap 10 is in the closed position. In the closed position of the butterfly valve 10, the butterfly valve 10 abuts against a stop 9, so that over-rotation of the butterfly valve 10 beyond the closed position is avoided.

On the other hand, when the temperature of the expansion medium lowers again below the predetermined temperature, the expansion medium 10 contracts, so that the volume of the expansion medium decreases. Due to the reduction in the volume of the expansion medium, the pressure within the bourdon spring 30, 5 is reduced so that it generates a torque which converts the butterfly valve into the open position.

In the shut-off device 1 shown in Figure 1, the Bourdon spring 30 is disposed on the pivot axis 14. In the embodiment according to FIG. 11, the bourdon spring 30 is not arranged on the pivot axis 14. Rather, a free leg of the bourdon spring 30 is connected via a two-part transmission linkage 32 with the butterfly valve 10. Thus, the Bourdon spring 30 is motion-coupled to the butterfly valve 10 by means of the Ge-15 power link 32. The remaining mode of operation of the shut-off device 1 shown in FIG. 11 is identical to the functioning of the shut-off device 1. 20 shown in FIG

The use of a Bourdon spring 30 as a drive device for the butterfly valve 10 has the advantage that when a critical temperature is exceeded, the shut-off device 1 can be transferred automatically and without the need for a control device with a temperature sensor and a drive motor, the butterfly valve 10 in the closed position, whereby the expansion of a fire or smoke is prevented by the ventilation system. At the same time, the use of a Bourdon spring 30 in a shut-off device 1 offers the advantage that when the temperature falls below the predetermined temperature regarded as critical, the shut-off device automatically returns the shut-off flap to the 18/63 17

Open position moves. A known from the prior art fusible link, which holds the butterfly valve 10 in the open position and melts when exceeding the predetermined temperature, must not be replaced for reuse.

It should be noted that a transfer of the butterfly valve 10 in the closed position by the Bourdon spring 30 is only useful and possible if the temperature development was not so great that the butterfly valve has been destroyed due to the high temperatures. The Bourdon spring 30 therefore ensures a safe transfer of the butterfly valve 10 in the closed position when exceeding the predetermined temperature (for example 72 ° C), whereas the Bourdon spring 30 can only convert the butterfly valve 10 in the open position when the butterfly valve 10 due to very high temperatures has not been destroyed. If, however, only a cold room development was present, the butterfly valve 10 is reliably transferred by means of the Bourdon spring 30 falls below the predetermined temperature again in the open position.

In Figures 3 to 7 and 10A to 11, the shut-off device 1 is shown without the Bourdon spring 30, however, the Bourdon spring in the illustrated embodiments may also be provided as described above. In FIGS. 3, 4A and 4B, the shut-off flap 10 is in the open position, in which the flap-housing channel 4 is permeable to flow. In the open position shown here, the normal of the butterfly valve 10, which is perpendicular to the surface of the butterfly valve 10, perpendicular to the central axis of the flap housing 2. However, in 19/63 ♦ ··· ·· ·· # ··· · · · · · · · · · · · · · · · 18

Open position of the butterfly valve 10 whose normal include a deviating from 90 ° angle with the central axis of the damper housing 2, as long as it is only ensured that the damper housing channel 4 is flow-permeable 5.

From Figure 3 it can be seen that along the circumference of the butterfly valve 10, a seal 12 is arranged circumferentially. The seal 12 of the butterfly valve 10 serves to seal a gap between the butterfly valve 10 and an inner wall of the flap housing 2 in the closed position of the butterfly valve 10 shown in FIGS. 3, 4A and 4B, in which the valve housing channel 4 is impermeable to flow. 15

The butterfly valve 10 is pivotable between the open position and the closed position by means of a drive device 40. In this case, the drive device 40 may be configured as an electric motor 40, as a hydraulic motor 40 or as a manually operable drive device 40. The drive device 40 is coupled by means of a three-part transmission linkage 42 with the butterfly valve 10. Furthermore, the shut-off device 1 comprises a protruding into the valve housing channel 4 temperature sensor 16, which may be connected to the drive means 40 via a signal line, not shown. The drive device 40 may have a control device 30 which controls the operation of the drive device 40. Alternatively, a separate and not shown control means may be used which is connected to the drive means 40 and to the temperature sensor 16 via signal lines not shown.

When a predetermined temperature, for example 70 ° Celsius, is exceeded, the control device 5 controls the drive device 40 in such a manner that it pivots the shut-off flap 10 via the transmission linkage 42 from the open position to the closed position, so that the flap-housing channel 4 is no longer permeable to flow in the closed position. 10

From Figures 3, 4A and 4B it can be seen that in each case a transition piece 20 is attached to the two connecting flanges 6 of the valve body 2, which are each arranged between the valve housing 2 and the Strö-15 mungskanal, not shown. However, the flap housing 2 can also be connected directly to a flow channel by means of the two connecting flanges 6. The transition pieces 20 each have a transitional channel 22 which is bounded by a first connection flange 24 and by a second connection flange 26.

The first connection flange 24, which faces the flap housing 2 and is connected to the connection flange 6, has a first cross section which corresponds to the cross section 25 of the flap housing channel 4. Since the cross section of the flap housing channel 4 is elliptical or superelliptic, also the first cross section of the transition channel 2 is also elliptical or superelliptic. The second connection flange 26, which faces the flow channel and can be connected to it, has a second rectangular cross-section which corresponds to the cross-section of the flow channel. 21/63 ·························································································································································································

It can be seen from FIG. 4B that the cross-sectional area of the flap housing channel 4 is approximately the same as the cross-sectional area of the transition channel 22 in the region of the second connecting flange 26 and thus approximately equal to the cross-sectional area of the flow channel (not shown).

FIG. 8 shows a schematic representation of the cross-sectional areas of the flap housing channel 4 and the flow channel and thus of the transition channel 22 in the region of the second connecting flange 26. In this case, Fl denotes the cross-sectional area of the flap housing channel 4, and thus the surface of a superellipse, since the cross-sectional area of the flap housing channel 4 in the illustrated embodiment is a superellipse. F2 denotes the area of the flow channel. The rectangular cross-sectional area F2 of the flow channel has a rectangular width Ra and a rectangular height Rb. In contrast, the width extent al of the superellipse is greater than the rectangular width Ra and the height extent bl of the superellipse is also greater than the rectangular height Rb.

The height and width extents of the rectangle and the superellipse are chosen so that the areas Fl and 25 F2 are identical. Although the surface Fl does not completely cover the corner regions of the surface F1, the widthwise extension al and the vertical extension bl of the superellipse are larger than the rectangle width Ra and the rectangle height Rb.

The cross-sectional area of the flap housing channel 4 thus corresponds to the cross-sectional area of the flow channel. However, there are also deviations in the cross-sectional areas 22/63 30 ······················· ······························································· · · · 21 of the flap housing channel 4 and the flow channel possible. Thus, the cross-sectional areas may vary between 5% and 10%, between 10% and 15%, between 15% and 20% and between 20% and 30% and between 30% and 50% of -5. In this case, either the cross-sectional area of the flow channel can be greater than the cross-sectional area of the flap housing channel 4 or vice versa.

In FIGS. 5, 6A and 6B, the shut-off device 1 shown in FIGS. 3, 4A and 4B is shown in the closed position, in which the valve housing channel 4 is impermeable to flow. In the closed position shown in the figures, the normal of the butterfly valve 10 and the central axis of the valve body 2 are all parallel to each other, so that the butterfly valve 10 is perpendicular to the valve housing channel 4. However, in the closed position of the butterfly valve 10, these need not necessarily be perpendicular to the valve housing channel 4 when the butterfly valve is dimensioned accordingly. Then, in order to transfer the shut-off flap 10 from the open position to the closed position, it does not have to be pivoted by 90 ° but by a smaller angle.

By activating the drive means 40, for example, 25 by a control means, not shown, which is connected to the drive means 40 and the temperature sensor via a signal line, a torque generated by the drive means 40 by means of the three-piece transmission linkage 42 is transmitted to the pivot axis 30 14 of the butterfly valve 10 , So that the shut-off valve 10 is pivoted from the open position to the closed position. 23/63 5 22 5 22 10 15

In the following it is assumed that the open position of the butterfly valve 10 corresponds to a 0 ° position, and that the closed position of the butterfly valve 10 corresponds to a 90 ° position. When transferring the butterfly valve 10 from the open position to the closed position, the seal 12 surrounding the butterfly valve 10 comes into contact with the inner wall of the flap housing 2 and thus with the flap housing channel 4, for example at an 85 ° position of the butterfly valve 10. Depending on the dimensions of the seal 12, the valve housing channel 4 and the butterfly valve 10 but the contact can be made at other angular positions of the butterfly valve. Due to the elliptical or superelliptic cross-sectional shape of the butterfly valve 10 whose cross section in the Cartesian coordinate system by the ellipse equation X ny - + a ~ b is described, where a and b are the semi-axes of the ellipse, x the x-coordinate, y the y-coordinate and n is a real number, comes the seal 12 in the 85 ° -Stel-20 ment only at two opposite points with the inner wall of the valve body 2 in contact.

In a further pivoting of the butterfly valve 10 in the direction of the closed position and thus in the direction of 25 ° 90 ° position, then successively further arcuate sealing portions of the seal 12 come into contact with the inner wall of the valve body 2. Thus, at the angular position where the seal 12 first contacts the flap housing channel 4 (85 ° in the upper 30 example), the seal 12 with the flap housing channel 4 does not come across its entire length extent with the 24/63

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Damper housing channel in contact, so that the seal 12 must not be deformed over its entire length extent. Furthermore, the static frictional force between the damper housing channel 4 and the seal 12 increases continuously 5 upon pivoting of the butterfly valve 10 in the 90 ° position. The torque to be applied by the drive device 40 consequently increases continuously when the shut-off flap is transferred to the closed position. On the other hand, when transferring a rectangular butterfly valve in a rectangular valve housing channel, the maximum torque must be generated immediately upon first contact of the seal with the valve housing channel.

Moreover, the ratio of the circumference to the area enclosed by the circumference is more favorable (smaller) in an ellipse than in a rectangle or a square, so that the applied torque for closing the butterfly valve 10 with an elliptical or super-elliptic cross-sectional geometry due the smaller perimeter is smaller than in a butterfly valve 10 with an example rectangular cross-sectional geometry. Therefore, in an inventive elliptical design of the fire damper 1 and the butterfly valve 10 and the flap housing channel 4, the An-25 drive device 40 for pivoting the butterfly valve 10 smaller than a fire damper with a rectangular butterfly valve.

As already explained above with reference to FIGS. 4B, 6B and 8, the butterfly valve 10 with an elliptical or superelliptic cross-sectional geometry has a large surface area. Thus, when installing the fire damper 1 according to the invention in an example rectangular or square flow channel no or only a small constriction through the fire damper 1, so that only small turbulence of the flow air are effected. As a result, the turbulence-related noise development due to the fire damper 1 according to the invention is reduced.

In the embodiments of the shut-off device 1 shown in Figures 1 to 7, the shut-off device 10 1 is connected with two transition pieces 20 via a con nection flange 6, each with a first flange 24 of the transition pieces 20.

It can be seen from FIGS. 10A and 10B that a connection between the flap housing 2 and the transition pieces 20 is also possible via a so-called flanging. The surface ends of the transition piece 20 engage spirally in the surface ends of the flap housing channel 2, as shown in Figure 10B. By further compression of the structure shown in Figure 10B, the connection between the transition piece 20 and the valve body channel 2 can be further solidified.

From FIG. 10A it can be seen that the flap housing 2 25 has an inspection opening 8 for the maintenance of the shut-off device 1. This inspection opening 8 can also be provided in the shut-off device 1 shown in FIGS. 1 to 5. FIGS. 9A, 9B and 9C show a transition piece 20 in three-dimensional perspective view, in plan view and in side view. In this illustrated transition piece 20, the cross-sectional area is 26/63

25 of the flow channel-side end is smaller than the cross-sectional area of the valve housing-side end, so that consequently the cross-sectional area of the shut-off device 1 or the cross-sectional area of the shut-off valve 10 is greater than the cross-sectional area of the flow channel. The respective end surfaces 24, 26 may either each have a connection flange or may alternatively have a flanged edge. The transition piece 20 shown in Figs. 9A to 9C may be cut out of a sheet material (e.g., a sheet, a flexible and refractory sheet, etc.) and joined together by joining two free ends of the sheet cut out flat material is formed in the three-dimensional 15 transition piece 20 shown in Figures 9A to 9C.

As shown in Figure 11, alternatively, the valve body 2 may be formed integrally with the transition pieces 20. The Absperrvor-direction 1 shown in Figure 9 has on its outer side Befestigungseinrich lines 19 in the form of threaded rods 19, by means of which the shut-off device 1 can be fixed for example in a masonry or on a mounting structure. These fastening devices 19 can of course also be used in the shut-off devices 1 according to FIGS. 1 to 8.

It can also be seen from FIG. 11 that the left-hand side of the flap housing 2 is provided with a circumferential ther- mal insulation 18, so that a heat transfer from the blocking device 1 to a substructure or to a wall construction is reduced. 27/63 ·············································. Μ. 26

In the illustration of FIG. 11, the right-hand side of the shut-off device 1 represents the motor side, that is to say the side of the shut-off device 1 on which a withdrawal motor or a fan is arranged. The left side of the shut-off device 1 illustrated in FIG. 5 represents the side which is connected to a ventilation system. By closing the butterfly valve 10 can warm or hot air and smoke only reach up to the butterfly valve 10, so that the thermal insulation 18 is disposed only 10 in this area around the valve body 2.

FIGS. 12 and 13 show a manual drive / safety device 50 which can be used instead of the drive device 40 or instead of the Bourdon spring 30 or alternatively in addition to the Bourdon spring 30 and to the drive device 40. The manual drive / safety device 50 comprises a drive shaft 51 which can be coupled to the pivot axis 14 of the butterfly valve 10 20. The drive shaft 51 is rotatably connected to a biasing means 54 in the form of a torsion spring 54 by means of a disc 52, wherein the disc 42 is fixedly connected to the drive shaft 51 and the torsion spring 54. The torsion spring 54 is also connected to a housing 58 of the manual drive / safety device 50.

The torsion spring 54 biases the drive shaft 51 and thus the shut-off valve 10 in such a way that the shut-off flap 10, which is coupled with the drive shaft 30 in a movement-coupled manner, is biased in the direction of the closed position. The manual drive / safety device 50 also includes two retainers 53 in the form of safety levers 53, which are shown in US Pat.

27

Recesses of the disc 52 engage and prevent rotation of the drive shaft 51. The holding devices 53 are slidably mounted on guide pins 55 and biased by compression springs 56. 5

By operating the locking lever 53 shown in Figure 13 above against the biasing force applied by the compression spring 56, the holding device 53 no longer engages in a correspondingly provided recess of the disc 10, so that the torsion spring 54, the drive shaft 51 and the movement coupled to the drive shaft 51 Can shut valve 10 in the closed position.

The holding device 53 15 shown in Figure 13 below attacks when transferring the butterfly valve 10 in the closed position in a correspondingly provided further recess of the disc 52, so that the butterfly valve 10 can not be pivoted from the closed position into the open position. Only by pressing the holding device 53 shown in Fig. 20 below against the biasing force applied by the compression spring 56, the butterfly valve 10 can be transferred from the closed position back to the open position by means of an operating lever 57 rotatably connected to the drive shaft 51, whereby the torsion spring 54 again is biased.

From FIG. 12 it can be seen that a bore 59 for a release pin 61 is provided in the housing 58 at the front.

FIG. 14 shows a triggering device 60. The triggering device 60 comprises a trigger pin 61, which is displaceably mounted in a pin guide 62. The trigger pin 61 is in contact with a bolt 64, which is connected to the pin guide 62 by means of a holding device 65 or securing device 65 designed as a fusible link 65 by means of a further bolt. Between the two two bolts, a compression spring 63 is arranged, which is biased in the state shown in Figure 14, that is compressed. When a predetermined temperature is exceeded, the melting solder 65 melts, so that the bolt 64 is displaced by the compression spring 63. Due to the connection of the trigger pin 61 with the bolt 64, the trigger pin 61 is pushed out of the pin guide 62.

As already mentioned above, the trigger pin 61 of the triggering device 60 can protrude through the bore 59 of the housing 58 15 and are in contact with the locking levers 13 shown in FIG. When a predetermined temperature is exceeded, the release pin 61 is pushed further into the housing 58 by means of the compression spring 63, so that the release pin 61 presses the safety lever 53 20 as described above against the applied by the compression spring 56 biasing force to the rear. Thus, the torsion spring 54 is released, so that the torsion spring 54, the drive shaft 51 and the movement of the drive shaft 51 coupled to the shut-off valve 10 can be converted into the closed position 25.

By means of the manual drive / safety device 50 shown in FIGS. 12 to 14, the butterfly valve 10 can be manually transferred from the open position into the closed position 30. Furthermore, by means of the manual drive / safety device 50, the shut-off valve 10 are transferred by simply operating a holding device 53 from the Öffenstellung to the closed position 29, and further, the butterfly valve 10 automatically by means of the triggering device 60 and the manual drive / safety device 50 of the open position are transferred to the closed position. 5

The described manual drive / safety device 50 is fastened together with the triggering device 60 on the outside of the shut-off device 1, so that after a triggering of the triggering device 60, the 10 fusible link 65 or directly the entire triggering device 60 can be exchanged without problems, without the shut-off device 1 must be opened.

Figure 15 shows a cross-sectional view of a portion 15 of the butterfly valve 10 in the closed position (left in Figure 15) and in a position between the closed position and the open position (right in Figure 15). The seal 12 arranged along the circumference of the butterfly valve 10 comprises two sealing segments 12a, 12b which have semicircular cross sections. In the valve housing channel 4, not shown in Figure 15, two beads are provided on the inner wall, in which the sealing segments 12a, 12b rest in the closed position of the butterfly valve 10 form-fitting manner. The seal 12, which can also be referred to as a sealing lip 12 12, consists of an elastic material, such as an elastomer such as PVC, PU or synthetic rubber (EDPM), with a hardness of, for example, Shore A 65, at lower temperature loads and from Silicone rubber at higher Temperaturbelastunun-30 conditions. The upper, the flap housing channel facing hollow chamber is stiffened with internal truss braces such that when swinging the butterfly valve 10 in the closed position, the laterally resulting, perpendicular to 31/63 *

30 acting on the geometric center of the butterfly valve 10 force prevents the sealing lip 12 at the lateral offset. The lower chamber is suitable for receiving an intumescent semi-rigid band. The sealing lip 12 is connected during the strapping of the flap 10 by radially aligned bores and screw connections 13 with the flap 10.

The first connection flange 24 of the transition piece 20 comprises a flange profile 27 and the second connection flange 26 of the transition piece 20 comprises four flange profiles 27. FIG. 16 shows a corresponding flange profile 27 in cross section. The four flange 27 of the second flange 26 are connected to each other by means of four corner brackets, not shown.

The flange 27 has a central mounting leg 27 a, which is aligned transversely to the longitudinal or mounting direction of the transition piece 20 in the mounted state. Channel inside, so facing the transitional channel 22, the mounting leg 27a goes into a U-shaped groove 27b, which does not necessarily have to be designed rectangular, but for example, may also have a more circular shaped like a bead undercut, as this basically from the DE 41 40 870 Al is known. The inner material end 27c of the flange material is bent over in the cross-section according to FIG. 16 barb-like in the direction of the groove 27b and thus forms a barb-like retaining strip 27d.

The outer boundary edge 27e of the flange profile 27 lying opposite the material end 27c is folded twice convexly and once concavely to obtain a higher rigidity, forming a stiffening angle 27f extending transversely to the mounting leg 27a and protruding beyond the mounting leg 27a. 5 allelschenkel 27g over which adjacent to a small distance and parallel or at least approachally parallel to the mounting leg 27a. The boundary edge 27e then ends shortly before the cross-sectionally U-shaped groove 27b. An anchoring lip (not shown) of a jacket material which forms the wall of the transition piece 20 can be inserted into the groove 27b and engage behind the retaining strip 27d. After insertion of this sealing lip, such as a bellows, in the corresponding circumferential groove 27b of the first flange 24 or the second flange 26, the bellows captive fixed to the flange 27.

The flange profile 27 need not necessarily have the par-20 allelschenkel 27g, because the functionality described above is achieved without the parallel leg 27 g. 32

List of suffixes: 1 Shut-off device, fire damper 2 Damper housing 5 4 Damper housing duct 6 Connection flange (of the damper housing) 8 Inspection opening 9 Stop 10 Butterfly valve 10 12 Seal 12a, 12b Seal segment 13 Screw fitting 14 Fixing point, pivot axis 16 Temperature sensor 15 18 Thermal insulation (of the damper housing) 19 Fastening device, threaded rod 20 transition piece 22 transition channel 24 first connection flange (of transition piece) 20 26 second connection flange (of transition piece 27 flange profile 27a mounting leg 27b groove 27c material end (of flange profile) 25 27d retaining strip (of flange profile) 27e boundary edge 27f stiffening angle 27g parallel leg 28 flared edge (of transition piece) 30 30 Bourdon spring 32 Transmission linkage (between Bourdon spring and butterfly valve) 40 Drive system, motor 34/63

42 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Fl F2 Ra Rb al bl 33

Transmission linkage Manual drive / safety device Drive shaft (the manual drive device)

Disc (the manual drive device) holding device / safety lever (the manual drive device)

Biasing device, torsion spring guide pin

compression spring

operating lever

casing

Hole for release pin

triggering device

release pin

pin guide

compression spring

bolt

Holding device, fusible link Superellipse surface Area of the rectangle Rectangular width Rectangular height

Width extension of Super Ellipse Height extension of Super Ellipse 35/63

Claims (16)

1. Shut-off device (1) for closing a flow channel for air and / or gaseous media, the shut-off device (1) having the following features: - the shut-off device (1) comprises a flap housing (2) a valve body passage (4); the shut-off device (1) comprises a shut-off flap (10) which is pivotally mounted in the flap housing channel (4) on a pivot axis (14); along the periphery of the butterfly valve (10) a seal (12) is arranged; the butterfly valve (10) is pivotable between an open position and a closed position; in the open position of the butterfly valve (10), the flap housing channel (4) is flow-permeable; and, in the closed position of the butterfly valve (10), closes the valve housing channel (4) so that the valve housing channel (4) is fluid-impermeable, characterized by the following features: the shut-off device (1) comprises a Bourdon spring (30) filled with an expansion medium; the bourdon spring (30) is connected to the valve body (2) and is coupled in movement with the butterfly valve (10); when a predetermined temperature of the expansion medium is exceeded, the volume of the expansion medium increases such that the Bourdon spring (30) 36/63 A torque which converts the shut-off flap (10) into the closed position developed; and falling below the predetermined temperature of the expansion medium, the volume of the expansion medium decreases such that the Bourdon spring (30) develops a torque which converts the butterfly valve (10) in the open position, 2. Shut-off device (1) according to claim 1, characterized marked-10 records that the flap housing channel (4) and the butterfly valve (10) each have elliptical cross-sections. 3. shut-off device (1) according to claim 2, characterized marked 15 records that the cross-sectional shape of the butterfly valve (10) in the Cartesian coordinate system of the ellipse equation corresponds to n + = 1, where a and b are the semi-axes of the ellipse, x the X coordinate, y is the y coordinate and n is a real number 20 in the range 10 £ n £ 2. 4. Shut-off device according to claim 2 or 3, characterized in that the elliptical shape of the cross-section of the butterfly valve (10) is approximated by a polygon. 25 5. Shut-off device (1) according to one of claims 2 to 4, characterized in that the cross-sectional area of the flap housing channel (4) corresponds to the cross-sectional area of the flow channel. 37/63 30 5 36 6. Shut-off device (1) according to one of the preceding claims, characterized by the following features: the shut-off device (1) further comprises at least one transition piece (20) connected to the flap housing (2) with a transition channel (22); the transition duct (22) has on a side facing the flap housing (2) a first cross section which corresponds to the cross section of the flap housing channel (4); 10, the transition channel (22) has, on a side facing the flow channel, a second cross section which corresponds to the cross section of the flow channel; and the transition piece (20) is connectable to the flow channel such that the transition channel (22) forms a flow channel portion. 7. shut-off device (1) according to one of claims 1 to 6, characterized by the following features: 20 25 the shut-off device (1) further comprises at least one with the flap housing (2) connected transition piece (20) having a transition channel (22); the transition duct (22) has on a side facing the flap housing (2) a first cross section which corresponds to the cross section of the flap housing channel (4); 30, the transition channel (22) has, on a side facing the flow channel, a second cross section which corresponds to the cross section of the flow channel; and the transition piece (20) is positively and / or cohesively connected to the flap housing (2). 38/63 37 8. Shut-off device (1) according to one of claims 6 or 7, characterized in that the transition piece (20) is invariable in its axial extent and thus rigid. 9. shut-off device (1) according to any one of claims 6 or 7, characterized in that the transition piece (20) is variable in its axial extent and thus flexible. 10. shut-off device (1) according to one of claims 6 to 9, characterized in that the transition piece (20) is formed of a sheet material, wherein the sheet material has a shape such that by connecting two end edges of the sheet material 15 the Transition piece (20) is formed. 11. Shut-off device (1) according to one of claims 6 to 10, characterized by the following features: the transition piece (20) comprises a first An-20 schlußflansch (24) and a second connecting flange (26); the first connection flange (24) and the second connection flange (26) each comprise a flange profile (27); and 25 - the flange profile (27) comprises a mounting leg (27a) and a mounting groove (27b) into which a retaining strip (27d) protrudes. 12. Shut-off device (1) according to one of the preceding 30 claims, characterized in that the shut-off device (1) comprises a drive device (40) coupled to the shut-off flap (10) by means of the 39/63 ·· ·· ·· ·· · · · · · · · »· · · · · · · ≫ The butterfly valve (10) can be pivoted by a motor between the open position and the closed position. English: v3.espacenet.com/textdoc? 13. Shut-off device (1) according to one of the preceding claims, characterized in that the shut-off device (1) comprises a movement-coupled with the shut-off valve (10) operating lever (57) by means of which the butterfly valve (10) manually pivotable between the open position and the closed position is. 14. shut-off device (1) according to any one of the preceding claims, characterized by the following features: the shut-off device (1) comprises a biasing means (54) which biases the shut-off valve (10) to the closed position; the shut-off device (1) comprises a holding device (53) which holds the shut-off flap (10) in the open position; and when a predetermined temperature within the shut-off device (1) is exceeded, the holding device (53) releases the shut-off flap (10), so that the shut-off flap (10) is pivoted into the closed position by means of the pretensioning device (54). 15. Shut-off device (1) according to one of the preceding claims, characterized by the following features: on an inner wall of the flap housing (2) two circumferential beads are provided; the seal (12) comprises two sealing segments (12a, 12b); and in the closed position of the butterfly valve (10), the sealing segments (12a, 12b) are positively against the beads of the flap housing (2). 40/63 39 16. Shut-off device (1) according to one of the preceding claims, characterized in that on an inner wall of the flap housing (2) a circulating belt is arranged, which is in the closed position of the butterfly valve (10) with 5 of the seal (12) in contact and at Exceeding a predetermined temperature foams. 41/63