EP3834892A1 - Fire damper - Google Patents

Abstract

The invention relates to a fire protection flap with a housing (1) and with a shut-off flap leaf (2) which is mounted therein, in particular in the center of the housing cross-section, between an open position and a closed position so that it can pivot about an axis of rotation and which counteracts the restoring force of a spring element (7) its closed position can be pivoted into its open position, a retaining element (10) being provided to fix the butterfly valve blade (2) in its open position, which in the open position of the butterfly valve blade (2) interacts with a holding area (11) of a thermally triggered release device (12) , wherein the holding area (11) can be triggered from its holding position by heat or the like and can be automatically displaced into its release position, with the holding of the butterfly valve leaf (2) in its open position takes place un d after the release of the release device (12) and thus after the holding area (11) has been displaced from its holding position to its release position, the shut-off valve leaf (2) is displaced into its closed position by the restoring force of the spring element (7). In order to specify a fire damper whose butterfly valve blade can also be moved slowly and in a controlled manner from its open position to its closed position, the fire damper should be directly or indirectly linked to the butterfly valve blade (2) to move the butterfly valve blade (2) between its closed position and its open position and connected, on the outside of the housing (1) arranged drive (29) and for the remotely controllable release of the fixation between the holding area (11) of the release device (12) and the holding element (10) for the subsequent, by the drive ( 29) or the spring element (7) caused displacement of the butterfly valve leaf (2) from its open position into its closed position by means of a remotely controllable release device (28), the speed of the displacement of the butterfly valve leaf (2) from its open position into its closed position by de n drive (29) can be determined.

Description

The invention relates to a fire damper with, for example, a round or angular housing and with a shut-off flap blade, which is mounted therein, in particular in the center of the housing cross-section, between an open position and a closed position about an axis of rotation and which moves from its closed position into its open position against the restoring force of a spring element is pivotable, wherein a retaining element is provided for fixing the butterfly valve blade in its open position, which in the open position of the butterfly valve blade interacts with a retaining area of a thermally releasable release device, the retaining area being releasable from its retaining position by heat or the like and automatically displaced into its release position, whereby the interaction of the holding element and the holding area located in the holding position holds the butterfly valve blade in its open position and after it has been triggered en the triggering device and thus after displacement of the holding area from its holding position into its release position, the displacement of the butterfly valve leaf is effected by the restoring force of the spring element into its closed position.

A manually operated actuating lever is provided on the outside of the housing to move the shut-off flap leaf of the fire dampers described above from its closed position to its open position against the restoring force of the spring element. In the open position of the butterfly valve blade, the actuating lever acts with the holding area of the release device, which comprises a fusible link together. Corresponding fire dampers work purely mechanically. In the event of a fire, after the fusible solder, which is located in the housing and melts, suddenly melts, the holding area is shifted from its holding position to its release position. As a result, the butterfly valve blade is suddenly shifted into its closed position by the restoring force of the spring element.

It is also possible to manually trigger the shift from the open position to the closed position. For this purpose, the holding area is manually moved from its holding position into its release position. However, the speed of the closing movement cannot be influenced. Rather, even with manual triggering, the shut-off valve blade is shifted suddenly from its open position into its closed position. Access to the fire damper, which can also be installed in a false ceiling, is also required for manual triggering.

The object of the invention is to avoid the aforementioned disadvantages and to provide a fire protection flap whose butterfly valve blade can also be moved slowly and in a controlled manner from its open position into its closed position, for example.

This object is achieved in that the fire damper has a drive that is directly or indirectly connected to the damper blade and is arranged on the outside of the housing to move the butterfly valve blade between its closed position and its open position and vice versa, and that for the remotely controllable release of the fixation between the Holding area of the release device and the holding element for the subsequent displacement of the butterfly valve leaf from its open position into its closed position, brought about by the drive or the spring element either the area of the holding element that interacts with the holding area of the triggering device or the holding area of the triggering device that interacts with the holding element can be displaced by means of a remotely controllable release device, the speed of displacement of the butterfly valve blade from its open position into its closed position being determinable by the drive. The torque generated by the drive acting on the butterfly valve blade is greater than the restoring force generated by the spring element.

The fire damper can have a continuous shaft, the drive being pushed onto one of the two ends of the shaft. Alternatively, two stub shafts can also be provided, the drive being slipped onto one of the two stub shafts. In such a configuration, the drive acts directly on the butterfly valve blade. However, it is also possible that the drive is indirectly connected to the butterfly valve blade via a linkage, which is preferably arranged in the housing.

The configuration according to the invention allows, for example, a routine check of the functionality of the fire damper remotely, for example by the building control system. Remotely controllable means that the corresponding relocation cannot be initiated manually on the fire damper itself, but from a remote location, for example from another room. For example, a functional test of all fire dampers installed in a building can be carried out via the building management system, without the person checking having to gain access to each fire damper as was previously the case in order to then be able to manually relocate it. Due to the inventive design, the position of the butterfly valve leaf can be changed as desired, for example by the building management system, ie the butterfly valve leaf can be moved slowly and in a controlled manner from its open position to its closed position and back. In addition to the open position and the closed position, any intermediate position of the butterfly valve blade can also be approached.

With regard to its torque, the drive is selected so that the torque generated by the drive is greater than the restoring force of the spring element acting on the butterfly valve leaf. In this way, the butterfly valve blade can be moved slowly and in a controlled manner into its open position and equally slowly and in a controlled manner by the drive back into its closed position.

In the fire damper according to the invention, all the functions of a known manually operated fire damper are retained. In the event of a fire, as with a known fire protection flap, the butterfly valve blade is suddenly closed by the restoring force after the fusible link has melted. However, the shut-off valve blade of the fire damper according to the invention can be relocated remotely as desired by means of the drive.

The drive can be used to open and, if necessary, also to close the butterfly valve blade, while the thermal release device causes sudden displacement in the event of a fire. The remotely controllable release device enables the remote-controlled opening and closing of the butterfly valve blade.

The drive and the remotely controllable release device can also be easily retrofitted to a known manually operated fire damper, so that a known manually operated fire damper can be converted to the embodiment according to the invention. Retrofitting is easy, since the manually operated actuating lever, for example, only has to be replaced by the drive and the remotely controllable release device has to be installed.

Due to the intrinsic safety of the mechanics, the butterfly valve blade remains in its open position even when the drive is de-energized. This proves to be an advantage, for example in the construction phase of a building project, compared to solutions known in the prior art. During this time, there is sometimes a desire to open fire dampers in order to be able to ventilate the building. The existing thermal release device is nevertheless ensures that the butterfly valve blade is moved into its closed position in the event of a fire.

The release device can be an electrically operating, a hydraulically operating or a pneumatically operating device. The release device can cause a displacement in both directions. However, it is also entirely possible that the release device only enables a displacement in one direction against a restoring force and that the displacement in the opposite direction is brought about by the restoring force.

The release device can be designed as an electromagnet.

The area of the holding element that interacts with the holding area of the release device can be designed as a locking bolt. The locking bar can be rigidly connected to the retaining element. However, it is also entirely possible for the locking bar to be translationally displaceable with respect to the holding element by means of the release device, preferably seen in the radial direction in relation to the axis of rotation of the holding element.

• wobei der Führungsabschnitt schräg ausgerichtet oder gekrümmt ausgebildet ist und den Rücklauf in Aufdrehrichtung versperrt, wobei zumindest der den Rücklauf in Aufdrehrichtung versperrende Teil des Führungsabschnittes gegen eine Federkraft entgegen die Aufdrehrichtung verlagerbar, vorzugsweise verschwenkbar, ist,
• wobei der Haltebereich sich in Aufdrehrichtung an den Führungsabschnitt anschließt und gegenüber dem Führungsabschnitt zurückversetzt angeordnet ist,
• wobei die Anlagefläche den Haltebereich an der Seitenkante begrenzt, die der Seitenkante, an der der Führungsabschnitt anschließt, gegenüberliegend angeordnet ist,
• wobei zumindest eine das Labyrinth in Richtung des Gehäuses drückende Feder vorgesehen ist.

In a preferred embodiment of the invention, the release device can be formed by the drive and a labyrinth can be provided, which is assigned to the release device and for guiding the locking bolt for the purpose of fixing the butterfly valve blade in its open position and for the purpose of releasing the fixing of the butterfly valve blade from its Open position is formed and which comprises a guide section, the holding area, a contact surface and a return,

• wherein the guide section is oriented obliquely or curved and blocks the return in the untwisting direction, at least the part of the guide section blocking the return in the untwisting direction being displaceable, preferably pivotable, against a spring force against the untwisting direction,
• wherein the holding area adjoins the guide section in the untwisting direction and is arranged set back with respect to the guide section,
• wherein the contact surface delimits the holding area on the side edge which is arranged opposite the side edge to which the guide section adjoins,
• wherein at least one spring pressing the labyrinth in the direction of the housing is provided.

The function of a fire damper with this design is as follows: For the purpose of fixing the butterfly valve blade in its open position, when the drive is rotated in the untwisting direction, the sliding of the locking bar along the guide section causes an increasing displacement of the labyrinth against the spring force generated by the spring and thus the distance between the labyrinth and the housing is increased. After a further displacement of the locking bolt in the untwisting direction, after the locking bolt has slid completely along the guide section, the labyrinth and thus also the retaining area are moved by the spring in the direction of the housing, making contact between the locking bolt and the retaining area to fix the butterfly valve leaf in its Relocated open position. For the purpose of releasing the fixation of the butterfly valve leaf, the locking bolt can first be displaced further in the untwisting direction by the drive until the locking bolt is no longer in contact with the contact surface, and the labyrinth is then moved further in the direction of the housing by the spring, so that the locking bolt is in the return and the butterfly valve blade can be moved into its closed position after changing the direction of rotation of the drive. With such a configuration, only one drive is required. Due to the interaction of the locking bolt and the labyrinth, the butterfly valve blade can be both closed and opened by means of the drive.

Between the drive and the butterfly valve blade, a freewheeling device can be provided which has two transmission elements that are positively connected to one another and enabling freewheeling, the freewheeling device being designed in such a way that when the butterfly valve blade is suddenly displaced by the spring element after the release device has been released from its open position its closed position the drive is decoupled. The freewheel device represents a positive coupling with a freewheel, which is arranged between the drive or a possibly provided gear on the one hand and the butterfly valve blade on the other hand. The length of the freewheel produced by the freewheel device corresponds approximately to or equal to a quarter turn, i. H. the displacement path of the butterfly valve blade from its open position to its closed position. The freewheel device ensures that in the event of a fire, when the butterfly valve blade is suddenly shifted by the spring element from its open position to its closed position after the release device has been triggered, the spring element does not have to move the drive and possibly the gear arranged between the butterfly valve blade and the drive. Rather, the drive and possibly also the transmission is (are) decoupled preferably over the entire displacement path from the open position to the closed position.

In a conceivable embodiment, one transmission element can comprise a receiving area having a circumferential wall, with an elongated hole extending approximately over a quarter of the circumference of the wall being provided in the wall, and the other transmission element comprising a transmission section projecting into the receiving area with a laterally protruding pin , wherein the pin protrudes into the elongated hole and the receiving area is dimensioned such that at least one rotation of the transmission section over the length of the elongated hole is possible in the receiving area.

However, other configurations for producing a freewheel are also conceivable. For example, the freewheel device can be designed as a claw clutch, with one transmission element being a driver disk with at least one, preferably two or more evenly over the circumference of the one transmission element arranged in the direction of the other transmission element comprises a claw and the other transmission element comprises a drive plate with at least one, preferably two or more evenly arranged over the circumference of the other transmission element, pointing in the direction of the one transmission element, the claw (n ) of the two driver disks interlock. If each drive plate has two claws, each drive plate has two spaces. There is a space between two adjacent claws of a drive plate. A corresponding claw of the other drive plate engages in an intermediate space. The width of the claws is dimensioned in relation to the space formed in each case in such a way that a freewheel between the two driver disks is generated, which corresponds approximately to or equal to a quarter turn of the butterfly valve blade. This intervention enables torque transmission by turning. A claw coupling is also a form-fit coupling.

The release device can be attached to the holding element or integrated into the holding element. In such a configuration, the release device is part of the holding element. If the area of the holding element that interacts with the holding area of the release device is designed as a locking bolt, the release device actuates the locking bolt.

The drive can be designed as an electrically operating drive. Of course, other configurations are also possible. For example, it can also be a pneumatically or hydraulically operating drive.

The drive can be designed as an idling motor, the direction of displacement being such that the butterfly valve blade can be moved from its closed position into its open position by means of the drive. An idle motor is a drive that only allows displacement in one direction of rotation. At least partial decoupling takes place in the opposite direction of rotation. In this respect, the drive enables a shift the butterfly valve blade from its closed position to its open position. After the remotely controllable release of the fixation between the holding area of the release device and the holding element or, in the event of fire, after the melting solder has melted, the shut-off valve blade is only moved into its closed position by the restoring force generated by the spring element, while the drive is decoupled.

The drive can be connected directly or indirectly to the butterfly valve blade via a gear unit. By selecting a suitable transmission ratio in the transmission, the butterfly valve blade can be displaced slowly and in a controlled manner by the drive with the restoring force acting on the butterfly valve blade, even when using a drive with a lower power.

The drive can have an angle of rotation between approximately 90 ° and 100 °. In such a configuration, stops against which the butterfly valve blade rests in its open and closed position are not absolutely necessary. Of course, other drives such as 360 ° drives are also possible.

The fire damper can comprise an energy store. When voltage is applied, the energy storage device is charged so that even in the event of a voltage interruption, a remotely controllable displacement of the butterfly valve blade is still possible. The energy store can be a power cap, for example. A power cap comprises at least one chargeable capacitor.

Furthermore, a device can be provided which is set up to move the butterfly valve blade from its open position to its closed position so far against the later displacement direction, i.e. from the open position to the closed position, beyond the open position of the butterfly valve blade before the remotely controllable displacement of the butterfly valve blade to shift so that the fixation between the holding area and the holding element can be released load-free by remote triggering of the release device.

By actuating the device, the holding element is relieved, since the holding element no longer interacts with the holding area after actuation. The device can be, for example, the drive of the butterfly valve blade, which initially drives the butterfly valve blade against the subsequent direction of displacement, ie. H. shifted further from the open position to the closed position.

At least one stop can be provided against which the butterfly valve blade rests directly or indirectly in its open position.

Fig. 1

eine schräge Ansicht auf die Mechanik einer teilweise dargestellten erfindungsgemäßen Brandschutzklappe, wobei sich das Absperrklappenblatt in seiner Schließstellung befindet,

Fig. 2

einen Ausschnitt aus Fig. 1, wobei sich das Absperrklappenblatt in seiner Offenstellung befindet,

Fig. 3

das Halteelement mit einem ausgefahrenen Sperrriegel,

Fig. 4

den Gegenstand nach Fig. 3 mit einem eingezogenen Sperrriegel,

Fig. 5

ein Detail aus Fig. 2,

Fig. 6

den Gegenstand nach Fig. 5, wobei der Sperrriegel in das Halteelement verlagert worden ist,

Fig. 7

die thermische Auslöseeinrichtung mit Schmelzlot,

Fig. 8

den Gegenstand nach Fig. 7 ohne Schmelzlot,

Fig. 9

eine schräge Ansicht auf die Mechanik einer teilweise dargestellten erfindungsgemäßen Brandschutzklappe nach einem zweiten Ausführungsbeispiel, wobei sich das Absperrklappenblatt in seiner Schließstellung befindet,

Fig. 10

einen Schnitt durch die Mechanik des Gegenstandes nach Fig. 9,

Fig. 11

einen Schnitt in Richtung "X-X" durch den Gegenstand nach Fig. 10,

Fig. 12 a-e

die mittels einer aus der Ferne steuerbaren Freigabeeinrichtung erfolgte Verlagerung des Absperrklappenblattes aus seiner Schließstellung in seine Offenstellung (a-c) und die anschließende mittels der aus der Ferne steuerbaren Freigabeeinrichtung erfolgte Verlagerung des Absperrklappenblattes aus seiner Offenstellung in Richtung seiner Schließstellung (c-e) bei dem Gegenstand nach Fig. 9,

Fig. 13 a-d

die Verlagerung des Absperrklappenblattes aus seiner Offenstellung (a) in seine Schließstellung (d) im Brandfall bei dem Gegenstand nach Fig. 9,

Fig. 14

die Auslöseeinrichtung der Brandschutzklappe nach dem zweiten Ausführungsbeispiel und

Fig. 15 a-c

die mittels einer aus der Ferne steuerbaren Freigabeeinrichtung erfolgte Verlagerung des Absperrklappenblattes aus seiner Offenstellung in Richtung seiner Schließstellung bei dem Gegenstand nach Fig. 9.

An exemplary embodiment of the invention shown in the drawing is explained below. Show it:

Fig. 1

an oblique view of the mechanics of a partially shown fire damper according to the invention, with the butterfly valve blade in its closed position,

Fig. 2

a section Fig. 1 with the butterfly valve blade in its open position,

Fig. 3

the retaining element with an extended locking bolt,

Fig. 4

the subject Fig. 3 with a retracted locking bolt,

Fig. 5

a detail Fig. 2 ,

Fig. 6

the subject Fig. 5 , wherein the locking bar has been moved into the retaining element,

Fig. 7

the thermal release device with fusible link,

Fig. 8

the subject Fig. 7 without fusible link,

Fig. 9

an oblique view of the mechanics of a partially shown fire damper according to the invention according to a second embodiment, wherein the butterfly valve blade is in its closed position,

Fig. 10

a section through the mechanics of the object Fig. 9 ,

Fig. 11

after a section in the direction "XX" through the object Fig. 10 ,

Fig. 12 ae

the displacement of the butterfly valve blade from its closed position into its open position (ac) by means of a remotely controllable release device and the subsequent displacement of the butterfly valve blade from its open position in the direction of its closed position (ce) at the object by means of the remotely controllable release device Fig. 9 ,

Fig. 13 ad

the displacement of the butterfly valve blade from its open position (a) to its closed position (d) in the event of a fire on the object Fig. 9 ,

Fig. 14

the triggering device of the fire damper according to the second embodiment and

Fig. 15 ac

the displacement of the butterfly valve blade from its open position in the direction of its closed position in the case of the object by means of a remotely controllable release device Fig. 9 .

In all figures, identical reference symbols are used for identical or similar components.

In Figure 1 shows a partial area of a fire damper with a housing 1 and with a shut-off valve blade 2 pivoted about an axis of rotation in the center of the housing cross-section between an open position and a closed position. In the illustrated embodiment, the housing 1 has a round cross section. For the sake of clarity, only a portion of the housing 1 is shown.

To support the butterfly valve leaf 2, a shaft (not shown) is provided, for example, which penetrates the butterfly valve leaf 2 and both ends of which are rotatably supported in the housing 1 in a suitable bearing point.

How Figure 1 As can be seen, a recess 3 is provided in the housing 1 at a distance from the butterfly valve leaf 2, through which a shaft 4 is guided. The end of the shaft 4 protruding from the housing 1 is designed as a square. At the end of the shaft 4 located in the interior of the housing 1, a lever 5 engages, which is fastened in a rotationally fixed manner relative to the shaft 4. The end of the lever 5 is rotatably connected to one end of a rod 6, while the other end of the rod 6 is rotatably attached to the butterfly valve blade 2. In this respect, by rotating the shaft 4, the butterfly valve blade 2 can be removed from its in Figure 1 in the closed position shown in Figure 2 open position shown are relocated.

The butterfly valve leaf 2 can be pivoted from its closed position into its open position against the restoring force of a spring element 7. The spring element 7 is a spiral spring. One end 8 of the spiral spring is inserted into an opening 9 of the housing 1, while the other end of the spiral spring is fastened to the shaft 4 in a rotationally fixed manner.

On the end of the shaft 4 protruding from the housing 1, a retaining element 10 is provided for fixing the butterfly valve blade 2 in its open position. In the open position of the butterfly valve leaf 2, the holding element 10 interacts with a holding area 11 of a thermally releasable release device 12. The one with the holding area 11 of the release device 12 cooperating area of the holding element 10 has a locking bolt 13 that can be displaced by means of a remotely controllable release device 28. In this exemplary embodiment, the locking bar 13 can be displaced translationally and in the radial direction with respect to the axis of rotation of the holding element 10, which is formed by the shaft 4, with respect to the holding element 10 by means of the release device 28. In the illustrated embodiment, the release device 28 is designed as an electrically operating device, such as an electromagnet. In the Figures 3 and 5 the locking bolt 13 is in an extended state. In this position, the locking bar 13 of the holding element 10 interacts with the holding area 11. In the Figures 4 and 6th the locking bar 13 is in its retracted position.

The displacement of the locking bar 13 in the direction of the arrow in the Figures 4 and 6th takes place by the release device 28. The displacement in the opposite direction, that is to say against the arrow 14, can also be effected by the release device 28. However, it is also entirely possible for the locking bar 13 to be displaced in the direction of arrow 14 by the release device 28 against a restoring force of a spring (not shown) and for the locking bar 13 to be displaced counter to arrow 14 by the restoring force of the spring.

The thermally releasable release device 12 is in the Figures 7 and 8th shown in detail. The release device 12 comprises a base plate 15 which is fastened to the outside of the housing 1. A tube 16, which protrudes into the housing 1, is fastened to the base plate 15. The tube 16 has an elongated hole 17 at a distance from its end protruding into the housing 1. A metal bolt 18 is provided in the tube 16 and is mounted displaceably in the tube 16. A thickening 19 is provided on the end of the metal bolt 18 protruding from the housing 1. A grip element 20, which has the holding area 11, is provided between the thickening 19 and the base plate 15. The grip element 20 can counter the force of a spring 21 designed as a spiral spring in the direction of the arrow 22 ( Fig. 8 ) be relocated. When the grip element 20 is displaced in the direction of the arrow 22, the holding area 11 is also displaced in the direction of the arrow 22.

A first retaining pin 23 is attached to the end of the tube 16 located in the housing 1. A second retaining pin 24 is provided on the metal bolt 18, which is arranged displaceably in the tube 16. The retaining pin 24 formed on the metal bolt 18 extends through the elongated hole 17. A spiral spring 25 is arranged between the two retaining pins 23, 24.

The thermally triggerable triggering device 12 further comprises a fusible link 26. In the non-triggered state, the fusible link 26 interacts with the two retaining pins 23, 24, so that the spiral spring 25, as shown in FIG Fig. 7 is shown, is compressed by the fusible link 26 and thus tensioned.

In the event of fire, the fusible link 26 melts when a defined temperature is exceeded, for. B. 70 ° C. Due to the melting of the fusible link 26, the spiral spring 25 presses the two retaining pins 23, 24 apart. As a result, the metal bolt 18 is suddenly displaced in the direction of the arrow 22. Since the metal bolt 18 in the area of the handle element 20 has a projection 27, such as a welded-on ring washer, which presses against the inside of the handle element 20 when the metal bolt 18 is displaced, the handle element 20 is also moved in the direction of the Arrow 22 shifted. This state is in Fig. 8 shown.

Furthermore, the fire damper has a drive which is directly or indirectly connected to the damper blade 2 and arranged on the outside of the housing 1 to move the butterfly valve leaf 2 between its closed position and its open position and vice versa. The drive is not shown in the figures. To fasten the drive, a mounting plate, for example, on which the drive is fastened, can be mounted on the outside of the housing 1. The drive, which is designed, for example, as an electrically operating drive and, for example, an angle of rotation between has approximately 90 ° and 100 °, is for example attached to the free end of the shaft 4 or connected to the end of the shaft 4 in some other way. The drive is preferably connected to the free end of the shaft 4 via a gear unit.

In the in the Figures 2 and 5 The position shown is the butterfly valve blade 2 in its open position. Due to the interaction of the holding element 10 and the holding area 11 located in the holding position, the shut-off valve leaf 2 is held in its open position.

For the remotely controllable release of the fixation between the holding area 11 of the triggering device 12 and the holding element 10 for the subsequent displacement of the butterfly valve leaf 2 from its open position into its closed position caused by the drive or the spring element 7, the holding area 11 of the triggering device is used 12 cooperating area of the retaining element 10, namely the locking bolt 13, by means of the remotely controllable release device 28 in the direction of the arrow 14 in the in Fig. 6 position shown shifted.

The fixation between the holding area 11 and the holding element 10 is thus released, so that the shut-off valve leaf 2 can be displaced into its closed position by the drive or by the spring element 7. The speed of displacement of the butterfly valve blade 2 from its open position into its closed position can be determined by the drive.

In addition to the previously described controlled solution of the fixation between the holding area 11 and the holding element 10, there is also the function of automatic displacement in the event of a fire. In the event of a fire, after the fusible link 26 has melted, the grip element 20 with the holding area 11 is suddenly shifted from its holding position into its release position by the spiral spring 25. After moving the holding area 11 from its holding position to its release position ( Fig. 8 ) the displacement of the butterfly valve blade 2 takes place through the restoring force of the spring element 7.

The drive, not shown, can also serve as a device which is set up to move the butterfly valve leaf 2 from its open position to its closed position so far against the later displacement direction beyond the open position of the butterfly valve leaf 2 before the remotely controllable displacement of the butterfly valve leaf 2 so that the fixation between the holding area 11 and the locking bolt 13 can be released without load by remote triggering of the release device 28.

Fig. 9 shows an oblique view of the mechanics of a partially shown fire damper according to the invention according to a second embodiment. On the end of the shaft 4 protruding from the housing 1, the holding element 10 is provided for fixing the butterfly valve blade 2 in its open position. In this embodiment, the holding element 10 has a manual operating handle 38 and the locking bolt 13, which interacts with the holding area 11 of the triggering device 12. In this exemplary embodiment, the locking bar 13 is rigidly connected to the holding element 10. The butterfly valve blade 2 is in Fig. 9 in its closed position. The locking bar 13 therefore does not interact with the release device 12.

How Fig. 9 As can be seen, the fire damper has a drive 29 and a gear 30. The drive 29 and the gear 30 are fastened to the outside of the housing 1 by means of a holding structure 44. The transmission 30 has, as for example the sectional view in FIG Figure 10 can be seen, a receiving area having a circumferential wall 39.

Between the drive 29 and the butterfly valve leaf 2, a freewheel device is provided, which has two positively interconnected transmission elements that enable freewheeling, the freewheel device being designed in such a way that when the butterfly valve leaf 2 is suddenly displaced by the spring element 7 after the release device 12 has been triggered the drive 29 is decoupled from its open position into its closed position. One transmission element is with the shaft 4 and thus also with the butterfly valve blade 2 and the other transmission element with the gear 30 and thus also with the drive 29.

In this exemplary embodiment, the one transmission element comprises a receiving area having a circumferential wall 39, with an elongated hole 35 extending approximately over a quarter of the circumference of the wall 39 being provided in the wall 39, and the other transmission element having a transmission section protruding into the receiving area with a laterally protruding pin 34, the pin 34 protruding into the elongated hole 35. The receiving area is dimensioned such that at least one rotation of the transmission section over the length of the elongated hole 35 is possible in the receiving area.

In the exemplary embodiment shown, the transmission element, which comprises the transmission section with the laterally protruding pin 34, is formed by the end of the shaft 4 protruding from the housing 1. The shaft 4 has a laterally protruding pin 34 in the area of its end protruding from the housing 1. If the unit consisting of drive 29 and gear 30 is plugged onto the end of shaft 4, pin 34 is located in elongated hole 35.

Since the elongated hole 35 extends approximately over a quarter of the circumference of the wall 39, as will be described below, freewheeling is achieved in a direction of rotation which corresponds to a pivoting path of around 90 ° with respect to the butterfly valve blade 2. The receiving opening formed by the wall 39 of the receiving area is dimensioned such that the end of the shaft 4 can rotate freely in the receiving opening.

If the pin 34 is at one end of the elongated hole 35 and the receiving area having the circumferential wall 39 is rotated by means of the drive 29 in the direction of the other end of the elongated hole 35, the holding element 10 is only then rotated until the pin 34 with the other End of the elongated hole 35 comes into contact. It is only from this point on when actuation of the drive 29, the holding element 10 and thus also the butterfly valve blade 2 is displaced.

The interaction between the pin 34 and the elongated hole 35 enables freewheeling. In the event of a fire, the spring element 7 does not have to overcome the torque generated by the drive 29 after the release device 12 has been triggered when the butterfly valve leaf 2 closes, since the pin 34 can be freely displaced in the elongated hole 35 to the opposite end. To limit the displacement path when moving by means of the drive 29, position switches 40 are provided.

Fig. 10 shows a section through the mechanics of the fire damper after Fig. 9 , while Fig. 11 a section in the direction of "XX" in Fig. 10 shows. The ones in the Figures 10-14 The dash-dotted line 41 in each case represents the plane of movement of the locking bolt 13.

As for example in Fig. 12 , in Fig. 14 or in Fig. 15 As shown, the grip element 20 has a kind of labyrinth for guiding the locking bolt 13 provided on the holding element 10. The labyrinth allows the butterfly valve blade 2 to be fixed in the open position or released from the open position. The labyrinth comprises a guide section 32, the holding area 11, a contact surface 33 and a return 42. The labyrinth is part of the grip element 20. In this respect, the labyrinth is pressed in the direction of the housing 1 by the spring 21 acting on the grip element 20.

In the exemplary embodiment shown, the guide section 32 is designed as a straight line and is oriented at an angle. The guide section 32 can, however, also be curved, for example. The guide section 32 blocks the return 42 in the untwisting direction (arrow 31). The return 42 is arranged at a greater distance than the guide section 32 from the housing 1 and is in this respect closer to the thickening 19. At least the part of the guide section 32 blocking the return 42 in the untwisting direction (arrow 31) is counter to a spring force against the untwisting direction ( Arrow 31) displaceable. In the illustrated embodiment, the guide section is 32 can be pivoted about a fulcrum 43 against a spring force in the direction of arrow 37.

The holding area 11 adjoins the guide section 32 in the untwisting direction (arrow 31) and is arranged set back with respect to the guide section 32. In the exemplary embodiment shown, the holding area 11 is aligned parallel to the shaft 4. In the open position, the locking bolt 13 rests against the holding area 11. In the untwisting direction (arrow 31), the guide section 32 is positioned in front of the holding area 11.

The contact surface 33 delimits the holding area 11 on the side edge which is arranged opposite the side edge to which the guide section 32 adjoins. In the open position of the butterfly valve leaf 2, the spring 21 presses the grip element 20 in the direction of the housing 1. The contact surface 33 is thus pressed laterally against the locking bolt 13. The contact surface 33 thus prevents inadvertent loosening of the fixation between the locking bar 13 and the holding area 11 in the open position due to the handle element 20 being displaced too far by the spring 21 acting on the handle element 20 in the direction of the housing 1.

In the Figures 12a-e is the process of relocating the butterfly valve leaf 2 manually by means of the manual operating handle 38 or by means of the remotely controllable release device 28 from its closed position (a) to its open position (c) and the subsequent relocation in turn by means of the remotely controllable release device 28 from its open position (c ) in its closed position (e) in the design of the fire damper according to the Figures 9 to 11 shown.

In the in Figure 12a In the position shown, the drive 29 has already displaced the butterfly valve leaf 2 from the closed position in the opening direction (arrow 31) until shortly before its open position. The direction of opening is understood to mean the direction in which the butterfly valve leaf 2 is displaced from its closed position into its open position. Since the locking bolt 13 is mechanically connected to the butterfly valve leaf 2, the locking bolt 13 is also in the untwisting direction (Arrow 31) has been rotated. In this position, the locking bolt 13 already touches the obliquely aligned guide section 32.

With a further displacement of the butterfly valve blade 2 by the drive 29 in the untwisting direction (arrow 31), as shown in FIG Figure 12b is shown, the grip element 20 is displaced against the force of the spring 21 in the direction of the arrow 22 by the sliding of the locking bolt 13 along the obliquely oriented guide section 32.

After the locking bolt 13 has finished sliding along the obliquely aligned guide section 32, the grip element 20 and thus the labyrinth is displaced against the arrow 22 by the spring 21 in the direction of the housing 1, so that the locking bolt 13 and the holding area 11 interact. In Figure 12c the butterfly valve blade 2 is in its open position. The locking bar 13 has been completely displaced along the guide section 32 and is now in contact with the holding area 11. The butterfly valve leaf 2 is thus fixed in the open position. Due to the spring 21 acting on the grip element 20, the contact surface 33 is pressed laterally against the locking bolt 13. The contact surface 33 thus prevents inadvertent loosening of the fixation between the locking bolt 13 and the holding area 11 in the open position due to the handle element 20 being displaced too far by the spring 21 acting on the handle element 20 in the direction of the housing 1.

In the open position, the drive 29 is stopped and can be de-energized. If partial freewheeling is desired, the drive 29 is turned back against the untwisting direction (arrow 31) until the pin 34, which is molded onto the shaft 4, is located at the other end of the elongated hole 35. A partial freewheel offers the advantage that when the butterfly valve leaf 2 is suddenly closed in the event of a fire, the torque generated by the drive 29 does not have to be overcome by the spring element 7.

To move the butterfly valve leaf 2 from its open position into its closed position by means of the remotely controllable release device 28, the drive 29 moves the butterfly valve leaf 2 and thus also the locking bolt 13 a little more in the untwisting direction (arrow 31) until the locking bar 13 is no longer in contact with the contact surface 33. This is in Figure 12d shown. The spring 21 now shifts the grip element 20 against the arrow 22 further in the direction of the base plate 15 and thus the housing 1. This releases the lock, so that the displacement path against the untwisting direction (arrow 31) and thus in the direction of the arrow 36 is free is.

As in Figure 12e shown, the direction of rotation of the drive 29 is changed for this, so that the locking bolt 13 is displaced in the return 42 in the direction of the arrow 36. Since the guide section 32 can be pivoted about the pivot point 43 against a spring force in the direction of the arrow 37, the guide section 32 is pushed away by the locking bolt 13 when it is shifted in the direction of the arrow 36 against a restoring force in the direction of the arrow 37, so that the locking bolt 13 can pass the guide section 32 and completely pass through the return 42. This process is in the Figures 15a to c shown. If you move the locking bolt 13 further in the direction of arrow 36 ( Figure 15c ) the drive 29 closes the butterfly valve blade 2 in a controlled manner.

As in Figure 15c As shown, the guide section 32 is pivoted back against the arrow 37 into its original position by the spring force after passing the locking bolt 13. In the original location, as well as in Figure 15c is shown, the guide section 32 closes the return 42 seen against the arrow 36. In this position of the guide section 32, the locking bolt 13 can open to the Figures 12 a to c described manner are brought back into contact with the holding area 11 for the purpose of fixing the butterfly valve leaf 2 in its open position.

The Fig. 13 ad show the displacement of the butterfly valve leaf 2 from its open position to its closed position in the event of a fire in the design of the fire damper according to the Figures 9 to 12 . In this embodiment, the shift from the open position to the closed position can also be carried out manually for test purposes by lifting the handle element 20 in the direction of arrow 22.

As in Figure 13a shown, the locking bolt 13 rests on the holding area 11. If desired, the above-described partial freewheeling of the drive 29 can have been generated.

In the event of a fire, the fusible link 26 melts or tears. The spiral spring 25 moves the metal bolt 18 and thus also the grip element 20 suddenly in the direction of the arrow 22 ( Figure 13b ). As a result, the locking bolt 13 is released from the holding area 11. As a result, the locking bolt 13 is released.

The spring element 7, which is mechanically connected to the locking bolt 13, shifts the butterfly valve leaf 2 suddenly into its closed position. This process is in Figure 13d shown.

If the above-described partial freewheel has been set, the spring element 7 does not have to overcome the torque generated by the drive 29 in the event of a fire when the butterfly valve leaf 2 closes, since the pin 34 can be freely displaced in the elongated hole 35 to the opposite end. If there is no partial freewheeling of the drive 29, the spring element 7 must overcome the torque generated by the drive 29 when the shut-off valve leaf 2 is closed.

How Figures 11 to 13 As can be seen, in the second exemplary embodiment the locking bolt 13 remains in a plane at every point in time of the displacement, which is indicated by the dash-dotted line 41. The distance between the locking bar 13 and the housing 1 always remains unchanged. While the locking bolt 13 is guided through the labyrinth, the handle element 20 is only shifted in the direction of arrow 22 or against the direction of arrow 22. This changes the distance between the handle element 20 and the housing 1, while the locking bolt 13 is moved by the Maze is moved.

Claims (16)

Fire damper with a housing (1) and with a shut-off damper blade (2) which is mounted therein, in particular in the center of the housing cross-section, between an open position and a closed position around an axis of rotation and which moves from its closed position into its closed position against the restoring force of a spring element (7) The open position can be pivoted, whereby a holding element (10) is provided to fix the butterfly valve leaf (2) in its open position, which in the open position of the butterfly valve leaf (2) interacts with a holding area (11) of a thermally releasable release device (12), the holding area (11) can be triggered from its holding position by heat or the like and can be automatically displaced into its release position, the shut-off valve blade (2) being held in its open position through the interaction of the holding element (10) and the holding area (11) in the holding position, and whereby after triggering the Au Release device (12) and thus, after the holding area (11) has been shifted from its holding position to its release position, the shut-off valve leaf (2) is shifted into its closed position by the restoring force of the spring element (7), characterized in that the fire protection flap is used to shift the shut-off valve leaf ( 2) between its closed position and its open position and vice versa has a drive (29) connected directly or indirectly to the butterfly valve blade (2) and arranged on the outside of the housing (1) and that for the remotely controllable release of the fixation between the holding area ( 11) the release device (12) and the holding element (10) for the subsequent displacement of the butterfly valve blade (2) from its open position into its closed position, brought about by the drive (29) or the spring element (7) either the area of the holding element (10) that interacts with the holding area (11) of the release device (12) or the holding area (11) of the release device (12) cooperating with the holding element (10) can be displaced by means of a remotely controllable release device (28), the speed of displacement of the shut-off valve leaf (2) from its open position into its closed position being determinable by the drive (29). Fire damper according to the preceding claim, characterized in that the release device (28) is an electrically working, a hydraulically working or a pneumatically working device. Fire damper according to the preceding claim, characterized in that the release device (28) is designed as an electromagnet. Fire protection flap according to one of the preceding claims, characterized in that the area of the holding element (10) which interacts with the holding area (11) of the triggering device (12) is designed as a locking bolt (13). Fire damper according to the preceding claim, characterized in that the release device (28) is formed by the drive (29) and that a labyrinth is provided which is assigned to the release device (12) and for guiding the locking bolt (13) for the purpose of fixing of the butterfly valve leaf (2) is designed in its open position and for the purpose of releasing the fixation of the butterfly valve leaf (2) from its open position and which has a guide section (32), the holding area (11), a contact surface (33) and a return (42) includes, - The guide section (32) being obliquely aligned or curved and blocking the return (42) in the untwisting direction (arrow 31), at least the part of the guide section (32) blocking the return (42) in the untwisting direction (arrow 31) against a The spring force is displaceable, preferably pivotable, counter to the untwisting direction (arrow 31), - wherein the holding area (11) adjoins the guide section (32) in the untwisting direction (arrow 31) and is arranged set back with respect to the guide section (32), - The contact surface (33) delimiting the holding area (11) at the side edge which is arranged opposite the side edge to which the guide section (32) adjoins, - At least one spring (21) pressing the labyrinth in the direction of the housing (1) is provided, so that when the drive (29) is turned in the untwisting direction (arrow 31) the sliding of the locking bolt (13) along the guide section (32) results in an increasing displacement of the labyrinth against the spring force generated by the spring (21) and thus the distance between the labyrinth and the housing (1) is enlarged, after a further displacement of the locking bolt (13) in the untwisting direction (arrow 31) the labyrinth and thus also the holding area (11) by the spring (21) in the direction of the housing (1) Establishing a contact between the locking bolt (13) and the holding area (11) for fixing the butterfly valve blade (2) in its open position and for the purpose of releasing the fixing of the butterfly valve blade (2) the locking bolt (13) by the drive (29) can initially be further displaced in the untwisting direction (arrow 31) until the locking bar (13) is no longer in contact with the contact surface (33), and the labyrinth is then widened by the spring (21) r is shifted in the direction of the housing (1) so that the locking bolt (13) is in the return (42) and the butterfly valve blade (2) after changing the direction of rotation of the drive (29) can be moved into its closed position. Fire damper according to one of the preceding claims, characterized in that a freewheel device is provided between the drive (29) and the shut-off flap leaf (2) which has two transmission elements that are positively connected to one another and enable freewheeling, the freewheel device being designed in such a way that at the sudden displacement of the butterfly valve blade (2) by the spring element (7) after the triggering device (12) has been triggered from its open position to its closed position, the drive (29) is decoupled. Fire damper according to the preceding claim, characterized in that the one transmission element has a receiving area having a circumferential wall (39), an elongated hole (35) extending approximately over a quarter of the circumference of the wall (39) being provided in the wall (39) , and the other transmission element comprises a transmission section protruding into the receiving area with a laterally protruding pin (34), the pin (34) protruding into the elongated hole (35) and the receiving area being dimensioned such that at least one rotation of the transmission section in the receiving area over the length of the elongated hole (35) is possible. Fire damper according to claim 6, characterized in that the freewheeling device is designed as a claw coupling, one transmission element comprising a drive plate with at least one, preferably two or more claws arranged evenly over the circumference of one transmission element and pointing in the direction of the other transmission element, and the other Transmission element comprises a drive plate with at least one, preferably two or more claws arranged uniformly over the circumference of the other transmission element and pointing in the direction of one transmission element, the claw (s) of the two drive plates interlocking. Fire damper according to one of the preceding claims, characterized in that the release device (28) is attached to the holding element (10) or is integrated into the holding element (10). Fire protection flap according to one of the preceding claims, characterized in that the drive (29) is designed as an electrically operating drive (29). Fire damper according to one of the preceding claims, characterized in that the drive (29) is designed as an idling motor, the direction of displacement being such that the butterfly valve leaf (2) can be moved from its closed position to its open position by means of the drive (29). Fire damper according to one of the preceding claims, characterized in that the drive (29) is connected directly or indirectly to the shut-off damper blade (2) via a gear (30). Fire protection flap according to one of the preceding claims, characterized in that the drive (29) has an angle of rotation between approximately 90 ° and 100 °. Fire protection flap according to one of the preceding claims, characterized in that the fire protection flap comprises an energy store. Fire damper according to one of the preceding claims, characterized in that a device is provided which is designed to move the damper blade (2) from its open position to its closed position so far against the subsequent direction of displacement before the remotely controllable displacement of the damper blade (2) is displaceable beyond the open position of the butterfly valve blade (2) so that the fixation between the holding area (11) and the holding element (10) can be released without load by remote triggering of the release device (28). Fire protection flap according to one of the preceding claims, characterized in that at least one stop is provided, on which the shut-off flap leaf (2) rests directly or indirectly in its open position.

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