Classifications

• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62C—FIRE-FIGHTING
  • A62C2/00—Fire prevention or containment
  • A62C2/06—Physical fire-barriers
  • A62C2/12—Hinged dampers

Definitions

• the invention relates to a fire damper, in particular for fans, with a housing part and with a flap part that swivels on Housing part is stored, and with one when exceeded triggering a predetermined temperature Locking device that the flap part in Closed position by means of a spring action in the locking support pivoting the locking position fixed.
• Fire dampers of the type mentioned are known. They are used, for example, in air outlet connections used by fans, in particular if these are connected to so-called single-pipe ventilation systems are. These single pipe ventilation systems will be preferred for inside bathrooms and toilets multi-storey houses used, being at a ventilation pipe running vertically through the floors Individual ventilation devices, in particular Fans, are connected. To prevent, that a fire spread through this ventilation system can, each individual ventilation device in a fire damper in its air outlet on when a predetermined temperature is exceeded spent under spring action in the closed position becomes. This creates a fire barrier created.
• Fire dampers are known as locking devices for the respective flap part Have coil springs, each having a coil spring section using a fusible link under tension being held. Melt in the event of a fire the fusible link, so becomes the coil spring section released and pivoted by the spring force in a locking position in which he is on the flap part supports so that this in the closed position relocated (if there was an opening position) and the flap part fixed in the closed position is, so that the way for strong, occurring in the event of fire Airflow is blocked.
• the well-known Fire dampers have the disadvantage that it can come to annealing the clock spring. Hereby is the locking effect of the clock spring in Asked a question.
• Fire dampers are also known, the one Locking support to fix the closed position of the Have flap part, with the locking support around an axis pivotally mounted and by means of a clock spring in the direction of the locking position is biased. Releases the locking device If a fusible link melts out, it pivots The locking support in the locking position. Functional reliability can also be questioned here be if it is due to high temperatures comes to annealing the clock spring.
• the invention is therefore based on the object a fire damper of the type mentioned to create that has a simple structure, can be easily assembled and a safe function guaranteed.
• this object is achieved by that the locking bracket to generate the spring action self-resilient and for generating the swiveling movement designed to be deflectable over its extension is.
• the locking bracket therefore takes over a double function, in which they on the one hand -in Direction of their longitudinal extension - in the locking position forms a tumbler for the flap part and on the other hand due to the self-suspension in a curved Position in normal operation using a Fuse part or the like under tension is held and in the event of fire by rebound arrives in the locking position, that is, as it rebounds, the arc will decrease Curvature of the locking support.
• This downsizing can preferably be only slightly arched Contour or even down to an approximately flat level Contour.
• the locking support is designed as a leg spring is.
• one end of the locking bracket is on the Fixed part of the housing and the other free end the locking support is under due to the self-suspension caused spring tension by means of a fuse part in one the opening movement of the Flap part held non-obstructive position. If the fuse part melts in the event of a fire, so the free end of the locking bracket released so that the locking bracket through the self-suspension into its locking position Change in shape of their longitudinal extent pivots, wherein the locking force direction of the locking support across, in particular approximately at right angles to their direction of travel runs. Is it the locking bracket around a rod or bar-shaped Leg spring, so the longitudinal extension the leg spring represents the direction of the locking force, while the travel direction runs transversely to it, because the travel direction due to an arcuate The locking support is bent.
• the longitudinal extent runs in the closed position the locking support vertically or approximately vertically to the level of the flap part or closes with the portion leading to the pivot axis of the flap part the plane of the flap part of an acute angle a.
• "Share" mentioned is the area to understand the flap part between the position of the flap part on which the has free end of the locking support in the locking case and - starting from there - to the swivel axis of the flap part extends.
• a stop for the free end of the locking support located. If the flap part by one Stamped sheet metal part is formed, the simple Possibility of stamping the stop by embossing one To create increase, being in the locking position the free end of the locking bracket at the end of the rebound travel against the flank of the elevation. In In this position, the locking support can be relaxed be, i.e. no longer have an inherent spring tension, or compared to the one normally available Flap release position a lower natural spring tension have. The latter has the consequence that increased security is created and that higher Spring forces applied by the locking bracket can be, since the self-suspension does not fall on Zero is mined.
• the locking support is designed as a spring plate. This can preferably be produced in the stamping process will.
• the housing part preferably has a flap support and a bearing part for the locking support.
• the bearing part preferably projects transversely to the plane of the Flap pad from this. It stretches especially at about a right angle to the Flap support level.
• the locking support at least one spring arm goes out in the locked position displacement movement of the locking support sprung across its length and in the locking position of the locking support with his free end one passed through the compression Stop facing. That way a tumbler has been created for the locking support, since pushing back the locking support prevents it is because the free end of the spring arm occurs in such a push back against the Stop and therefore prevents relocation. Even if therefore extremely high due to the fire Air pressure differences occur that the flap part is a secure locking of the flap part guaranteed in the closed position.
• the stop is preferably one section formed of the bearing part, so that no additional Parts must be used.
• the spring arm is made in one piece with the locking support, as this simplifies construction and assembly.
• spring arm and locking bracket each as separate Parts are formed that are attached to each other will.
• the latter opens up the possibility that the spring arm made of a different material or from material of different dimensions, for example Sheet thickness, is produced as the locking support.
• the spring arm consists of spring sheet and that the sheet thickness of the spring arm is smaller than the sheet thickness of the locking support is.
• the spring force of the spring arm can be chosen its width in relation to the spring force of the locking support can be set. This is particularly so relevant when the locking bracket and spring arm are made in one piece.
• the fire damper as a spring-loaded check valve is trained.
• the flap next to that having a spring action Locking device another spring , which preloads them in the closed position.
• the non-return valve moves tensioning the spring in the open position, that is, the spring has a restoring force that is less than the force due to the air flow of the fan on the flap becomes.
• FIG. 1 shows a cut-open building 1, which has several floors 2, 3 and 4, each provided with a bath 5 and a toilet 6 are. Each bathroom 5 and the toilets 6 on the floor 2 and the floor 3 are with fans 7 fitted. These are via air outlet connections 8 and steel ventilation pipes 9 to a vertical ventilation line 10 connected. The vent line 10 is surrounded by fire walls 11. The air outlet 8 of the fans 7 point one fire damper 12 each (FIGS. 2 to 8) which, in the event of fire, the air outlet connection 8 securely closes to a fire and To form a smoke barrier.
• the air outlet 8 of the fans 7 point one fire damper 12 each (FIGS. 2 to 8) which, in the event of fire, the air outlet connection 8 securely closes to a fire and To form a smoke barrier.
• the fan 7 has one electric drive motor 13, which is in the fan housing 14 is located and drives a fan wheel 15, arranged within a volute 16 is.
• an inner cover 17 (Arrow 18), which enters the volute casing 16 and - promoted by the fan wheel 15 - the air outlet port 8 is supplied.
• the fire damper 12 In the air outlet 8 is the already mentioned fire damper 12, which - according to Figure 3- has a housing part 19 and flap part 20.
• the fire damper 12 has one Locking device 21, the-in the event of fire Flap part 20 fixed in the closed position.
• the housing part 19 consists of a flap support 22 and one in the area of the pivot axis 23 of the flap part 20 attached to the flap support 22 Bearing part 24. As can be seen in FIG. 3, runs the longitudinal extent (double arrow 25) of Bearing part 24 approximately at right angles to the level of the flap support 22.
• the bearing part 24 is on the side of the flap support 22, on which also the flap part 20 is arranged so that -when open Flap part 20 (dashed in Figure 3 shown) - the flap part 20 during the opening movement the bearing part 24 approaches.
• the bearing part 24 has a bent end 26, that by means of a fastening device 27 on the Flap support 22 is attached. Furthermore, that Bearing part 24 of a preferably approximately rectangular Recess 28 passes through, which on the bearing part 24 two legs 29 are formed, the upper Area ( Figure 5) in a common, cranked Pass over end region 30 of bearing part 24.
• the offset is clearly shown in FIG. 3. It has the consequence that the free end 31 of End region 30 in a to the central axis 32 of the Air outlet 8 inclined position (Angle ⁇ approximately 5 ° to 15 °, in particular 10 °), where the free end 31 is at a height 3 - below the pivot axis 23 lies.
• a fastening device 33 for example a rivet or screw connection
• a locking bracket 34 of the locking device 21 attached to the free end 31 in such a way that the free end 35 of the strip-shaped as a spring plate 36 trained locking bracket 34 in the direction to the one in the closed position Flap part 20 has.
• the exact design of the locking bracket 34 goes from Figures 6 to 8. It is recognizable that the locking bracket 34 essentially from one rectangular strip 37, the upper Area a mounting hole 38 for the fastener 33 is formed, and in the area the lower third- to the free end 35 a spring arm on each side of the strip 37 39 goes out, the two spring arms 39 - According to Figure 8- with the strip 37 a diverging Form U-shape, that is, the spring arms 39 are so bent from the strip 37 that they in longitudinal extension to the free ends 40 of the spring arms 39 viewed - diverge.
• the locking bracket 34 is made of resilient Material, that is, it is self-resilient educated. In particular, it consists of spring plate. Since the strip 37 is integral with the spring arms 39 is also included in the Spring arms are the self-resilient property of the spring plate in front.
• the legs are in the lower region 29 of the bearing part 24 support arms 41 bent in one piece, which lie on the marginal edges of the recess 28.
• Limiting arms are on the outer sides 42 of the legs 29 43 bent, the limit arms 43 and the support arms 41 on the side of the bearing part 24, which are from the central axis 32 or the flap part 20 points away.
• On the Support arms 41 and between the limit arms 43 is a strip-shaped fuse part 44 inserted that the locking bracket 34 in biased Holds position as it does with a solid line emerges from Figure 3. This is the free End 35 of the locking bracket 34 under tension in the recess 38 bent in such a way that the free end 35 on the remote from the central axis 32 Side of the bearing part 34 is located.
• the end area the locking bracket 34 is supported on the strip-shaped fuse part 44, wherein the latter - according to Figure 3- between the locking bracket 34 and the bearing part 24 is located.
• the Fuse part 44 consists of two itself overlapping sections, the two sections by means of that located in the overlap area Are soldered together. Acts a certain one on the fuse part 44 Temperature exceeding the value (fire), so the fusible link melts, causing the two Parts of the fuse part no longer held together be and therefore the biased Release locking bracket 34 so that it is under Relaxation or partial relaxation right into the apparent from Figure 3, with a dashed line shown position in which the free end 35 occurs against the flap part 20 and this way the closed position of the Flap part 20 fixed.
• the clear dimension 1 between the free ends 40 of the Spring arms 39 are (according to FIG. 8) in the non-energized state slightly larger than the width b of the recess 28 of the bearing part 24. From FIG. 3 it can be seen that that the two spring arms 39 in the normal position (no fire) the recess 28 such reach through that they are on the central axis 32nd facing away from the bearing part 24. Becomes in the event of fire, the locking device 21 is triggered, so the spring force of the strip 37 is the Locking support 34 so strong that not only the Relocation takes place in the locking position, but that in the course of the displacement movement the spring arms 39 moved through the recess 28 are, where they slightly deflect the means that its clear dimension 1 becomes when passing the Recess 28 smaller.
• the fire damper 11 forms in normal operation the fan also has a non-return valve. For this, it is one of the free end of the bearing part 24 attached coil spring 46 acted upon, the closed position when the fan is not in operation of the flap part 20 ensures.
• a seal 47 is preferably arranged between the flap part 20 and the flap support 22 .

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Cited By (3)

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• 1997
  • 1997-06-23 DE DE1997126437 patent/DE19726437A1/de active Pending
• 1998
  • 1998-04-24 EP EP98107475A patent/EP0887086A3/fr not_active Withdrawn

Non-Patent Citations (1)

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