WO2007068786A1 - Fire damper blade - Google Patents

Fire damper blade Download PDF

Info

Publication number
WO2007068786A1
WO2007068786A1 PCT/FI2006/000370 FI2006000370W WO2007068786A1 WO 2007068786 A1 WO2007068786 A1 WO 2007068786A1 FI 2006000370 W FI2006000370 W FI 2006000370W WO 2007068786 A1 WO2007068786 A1 WO 2007068786A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
seal
damper blade
fire
intumescent
Prior art date
Application number
PCT/FI2006/000370
Other languages
French (fr)
Inventor
Esa Lampinen
Original Assignee
Fläkt Woods AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fläkt Woods AB filed Critical Fläkt Woods AB
Priority to EP06820051A priority Critical patent/EP1960060B1/en
Priority to AT06820051T priority patent/ATE518568T1/en
Priority to DK06820051.8T priority patent/DK1960060T3/en
Publication of WO2007068786A1 publication Critical patent/WO2007068786A1/en
Priority to NO20082968A priority patent/NO338823B1/en

Links

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
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C2/00—Fire prevention or containment
    • A62C2/06—Physical fire-barriers
    • A62C2/065—Physical fire-barriers having as the main closure device materials, whose characteristics undergo an irreversible change under high temperatures, e.g. intumescent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1406—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
    • F24F11/35—Responding to malfunctions or emergencies to fire, excessive heat or smoke by closing air passages

Definitions

  • the present invention relates generally to a fire damper blade of a circular shape and having a seal adapted about its perimeter for sealing the damper blade under normal operating conditions and the blade further having adapted about its perimeter an outer rim seal of intumescent seal material for establishing a leakproof seal under a fire condition.
  • the invention more particularly relates to a fire damper of a circular cross section enclosing a blade of circular shape.
  • the function of a fire damper is such that under normal conditions the blade is either in an open or a closed position as desired.
  • the perimeter of the blade has attached thereto, e.g., a conventional rubber seal that provides a leakproof seal between the blade and the inner surface of the damper duct sleeve element under normal conditions when the blade is driven into its closed position.
  • the fire damper blade according to the invention is characterized in that the intumescent seal material is protected by a refractory seal material placed over the intumescent seal material so as to substantially cover the entire perimeter of the blade.
  • the swelling of the intumescent material forces the refractory material into a sealing contact between the blade and the damper body.
  • a preferred embodiment of the fire damper blade according to the invention is characterized in that the refractory material is a flexible band of silica fiber.
  • the refractory material is in the shape of a hollow-core sleeving having the intumescent seal material adapted to fill the core or, alternatively, in the shape of a dual-layer band, whereby the intumescent seal material is placed between the layers.
  • a still another preferred embodiment of the fire damper blade according to the invention is characterized in that the refractory material is at least partially affixed to the perimeter of the damper blade.
  • the features of the invention include that the refractory material enclosing the intumescent seal material prevents the latter from disintegrating and keeps it in place under fire. Hence, the intumescent material gives an extended protective life compared with prior-art embodiments.
  • One additional benefit is that need of the expensive intumescent material is minimized.
  • FIG. 1 shows an axonomethc view of a wall portion having a fire damper of circular cross section mounted thereon;
  • FIG. 2 shows the assembly of FIG. 1 now in a side view;
  • FIG. 3 shows a fire damper blade in a front view
  • FIG. 4 shows the cross section of the fire damper of FIG. 3 taken along line C-C;
  • FIG. 5 shows a portion of the blade edge in an axonometric view
  • FIG. 6 shows the fire damper blade according to the invention in an axonometric view.
  • the invention relates to a fire damper of a circular cross section mounted in a hole made through a wall 1.
  • the fire damper typically comprises an air duct sleeve element 2 extending through the thickness of wall 1 and a fire barrier flange 3 surrounding the duct sleeve element so as to face the wall.
  • About the fire barrier flange is adapted a tightening band 4.
  • a circular damper blade 5 shown entirely and partially in FIGS. 3-6.
  • the blade is rotatably pivoted (not shown) such that it can assume a fully closed position, wherein airflow through the duct sleeve element is blocked, or, conversely, a fully open position wherein the blade is rotated by 90° from the closed position.
  • the blade may be situated in any intermediate position between these two end positions as required by local conditions.
  • FIG. 4 shows the edge of a damper blade 5 according to the invention in a sectional view.
  • Reference numeral 6 denotes a so-called moderate temperature seal that may be an O-ring seal made of a silicon polymer or rubber. The function of this seal is to seal the blade 5 tightly against the inner surface of the duct sleeve element 2 under normal circumstances when the damper blade is in its closed position.
  • O-ring seal other seal construe- tions may be contemplated.
  • an intumescent seal 7 Over this seal is placed a band 8 of refractory material, made of flexible silica fiber, for instance.
  • the blade of the fire damper must close immediately if it has not precedently been in its closed position.
  • the blade closure occurs automatically in a fashion known in the art, for instance, with the help of a spring triggered at the melting of a fusible link.
  • the seal 6 intended for service under moderate temperature conditions burns off under fire.
  • the intumescent seal material 7 begins to swell thus closing the gap between the inner surface of the air duct sleeve element and the blade even before the conventional moderate temperature seal 6 has disintegrated under heat.
  • the fire damper stays leakproof under all circumstances.
  • the basic concept of the present invention relates to the protection of the intumescent seal by means of a refractory material 8 substantially over the entire perimeter of the damper blade 5 thus substantially increasing the time over which the intumescent seal stays in place and extending the leakproofness of the blade under high temperature and pressure.
  • the refractory material 8 can be a silica fiber band, for instance.
  • the refractory material element may have the shape of, for instance, a band as shown in the diagrams or a hollow-core braid, whereby the intumescent seal 7 is placed in the hollow core.
  • the refractory silica fiber band 8 may have a double-layer structure, whereby the layers are adapted to cover both sides of the intumescent seal.
  • the band 8 is at least partially attached to the damper blade. As is evident from the diagrams, in the above-discussed embodiments the band 8 is secured by its "lower" edge about the perimeter of the damper blade.
  • the intumescent seal and the refractory material protecting the same are mounted on the inner wall of the air duct sleeve element, where they can sealingly expand against the blade under a fire situation.

Landscapes

  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Flow Control Members (AREA)
  • Fluid-Damping Devices (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Fluid-Driven Valves (AREA)
  • Safety Valves (AREA)
  • Confectionery (AREA)
  • Inorganic Insulating Materials (AREA)
  • Table Devices Or Equipment (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Gasket Seals (AREA)
  • Building Environments (AREA)

Abstract

A fire clamper blade (5) of a circular shape and having a seal (6) adapted about its perimeter for sealing the damper blade under normal operating conditions and the blade further having adapted about its perimeter an outer rim seal of intumescent seal material (7) for establishing a leakproof seal under a fire condition. The invention is implemented by way of having the intumescent seal material (7) protected by a refractory seal material (8) placed over the intumescent seal material (7) so as to substantially cover the entire perimeter of the damper blade (5).

Description

Fire damper blade
The present invention relates generally to a fire damper blade of a circular shape and having a seal adapted about its perimeter for sealing the damper blade under normal operating conditions and the blade further having adapted about its perimeter an outer rim seal of intumescent seal material for establishing a leakproof seal under a fire condition.
Accordingly, the invention more particularly relates to a fire damper of a circular cross section enclosing a blade of circular shape. Broadly, the function of a fire damper is such that under normal conditions the blade is either in an open or a closed position as desired. The perimeter of the blade has attached thereto, e.g., a conventional rubber seal that provides a leakproof seal between the blade and the inner surface of the damper duct sleeve element under normal conditions when the blade is driven into its closed position.
Under fire, the fusible link of the fire damper melts thus allowing the blade to close if it has previously been in its open position. Obviously, the heat of fire immediately melts the material of the seal that under normal conditions serves to make the fire damper leakproof. According to patent publication EP 1038555 A2, an intumescent material is adapted between the blade and the inner surface of the damper duct sleeve element.
Under fire a high overpressure develops in the volume enclosing the fire thus subjecting the blade to a substantial pressure differential. In its swollen state, the intumescent seal material under heat becomes porous, whereby leakages may readily develop past the blade due to the pressure differential imposed thereon.
It is an object of the present invention to provide a novel type of blade free from the above-described problem. The fire damper blade according to the invention is characterized in that the intumescent seal material is protected by a refractory seal material placed over the intumescent seal material so as to substantially cover the entire perimeter of the blade.
The swelling of the intumescent material forces the refractory material into a sealing contact between the blade and the damper body.
A preferred embodiment of the fire damper blade according to the invention is characterized in that the refractory material is a flexible band of silica fiber.
Another preferred embodiment of the fire damper blade according to the invention is characterized in that the refractory material is in the shape of a hollow-core sleeving having the intumescent seal material adapted to fill the core or, alternatively, in the shape of a dual-layer band, whereby the intumescent seal material is placed between the layers.
A still another preferred embodiment of the fire damper blade according to the invention is characterized in that the refractory material is at least partially affixed to the perimeter of the damper blade.
The features of the invention include that the refractory material enclosing the intumescent seal material prevents the latter from disintegrating and keeps it in place under fire. Hence, the intumescent material gives an extended protective life compared with prior-art embodiments. One additional benefit is that need of the expensive intumescent material is minimized.
The invention is next described in more detail with the help of a preferred exemplifying embodiment by making reference to the appended drawings in which
FIG. 1 shows an axonomethc view of a wall portion having a fire damper of circular cross section mounted thereon; FIG. 2 shows the assembly of FIG. 1 now in a side view;
FIG. 3 shows a fire damper blade in a front view;
FIG. 4 shows the cross section of the fire damper of FIG. 3 taken along line C-C;
FIG. 5 shows a portion of the blade edge in an axonometric view: and
FIG. 6 shows the fire damper blade according to the invention in an axonometric view.
Accordingly, the invention relates to a fire damper of a circular cross section mounted in a hole made through a wall 1. This kind of mounting is illustrated in more detail in FIGS. 1 and 2. The fire damper typically comprises an air duct sleeve element 2 extending through the thickness of wall 1 and a fire barrier flange 3 surrounding the duct sleeve element so as to face the wall. About the fire barrier flange is adapted a tightening band 4. In the interior of the fire damper duct sleeve element is adapted a circular damper blade 5 shown entirely and partially in FIGS. 3-6. The blade is rotatably pivoted (not shown) such that it can assume a fully closed position, wherein airflow through the duct sleeve element is blocked, or, conversely, a fully open position wherein the blade is rotated by 90° from the closed position. Obviously, the blade may be situated in any intermediate position between these two end positions as required by local conditions.
FIG. 4 shows the edge of a damper blade 5 according to the invention in a sectional view. Reference numeral 6 denotes a so-called moderate temperature seal that may be an O-ring seal made of a silicon polymer or rubber. The function of this seal is to seal the blade 5 tightly against the inner surface of the duct sleeve element 2 under normal circumstances when the damper blade is in its closed position. In lieu of the O-ring seal, other seal construe- tions may be contemplated.
About the damper blade perimeter is adapted an intumescent seal 7. Over this seal is placed a band 8 of refractory material, made of flexible silica fiber, for instance.
Under fire conditions, the blade of the fire damper must close immediately if it has not precedently been in its closed position. The blade closure occurs automatically in a fashion known in the art, for instance, with the help of a spring triggered at the melting of a fusible link. In practice, the seal 6 intended for service under moderate temperature conditions burns off under fire. Respectively under the temperature rise, the intumescent seal material 7 begins to swell thus closing the gap between the inner surface of the air duct sleeve element and the blade even before the conventional moderate temperature seal 6 has disintegrated under heat. Hence, the fire damper stays leakproof under all circumstances.
In summary, the basic concept of the present invention relates to the protection of the intumescent seal by means of a refractory material 8 substantially over the entire perimeter of the damper blade 5 thus substantially increasing the time over which the intumescent seal stays in place and extending the leakproofness of the blade under high temperature and pressure. As mentioned above, the refractory material 8 can be a silica fiber band, for instance. In lieu of a silica fiber band 8, obviously the use of any like flexible and refractory material may be contemplated. The refractory material element may have the shape of, for instance, a band as shown in the diagrams or a hollow-core braid, whereby the intumescent seal 7 is placed in the hollow core. Still further, the refractory silica fiber band 8 may have a double-layer structure, whereby the layers are adapted to cover both sides of the intumescent seal.
To ensure that the refractory silica fiber band 8 stays firmly fixed on the intu- mescent seal, the band 8 is at least partially attached to the damper blade. As is evident from the diagrams, in the above-discussed embodiments the band 8 is secured by its "lower" edge about the perimeter of the damper blade.
To a person skilled in the art it is obvious that the invention is not limited by the above-described exemplary embodiments, but rather may be varied within the inventive spirit and scope of the appended claims. Accordingly, the intumescent seal and the refractory material protecting the same are mounted on the inner wall of the air duct sleeve element, where they can sealingly expand against the blade under a fire situation.

Claims

What is claimed is:
1. Afire damper blade (5) of a circular shape and having a seal (6) adapted about its perimeter for sealing the damper blade under normal operating conditions and the blade further having adapted about its perimeter an outer rim seal of intumescent seal material (7) for establishing a leakproof seal under a fire condition, characterized in that the intumescent seal material (7) is protected by a refractory seal material (8) placed over the intumescent seal material (7) so as to substantially cover the entire perimeter of the damper blade (5).
2. The fire damper blade of claim 1, characterized in that the refractory material (8) is a flexible band of silica fiber.
3. The fire damper blade of claim 2, characterized in that the refractory material (8) is in the shape of hollow-core sleeving having the intumescent seal material (7) adapted to fill the core or, alternatively, in the shape of a dual-layer band, whereby the intumescent seal material (7) is placed between the layers.
4. The fire damper blade of any one of claims 1-3, characterized in that the refractory material (8) is at least partially affixed to the perimeter of the damper blade (5).
PCT/FI2006/000370 2005-12-13 2006-11-14 Fire damper blade WO2007068786A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP06820051A EP1960060B1 (en) 2005-12-13 2006-11-14 Fire damper blade
AT06820051T ATE518568T1 (en) 2005-12-13 2006-11-14 FIRE DAMPER RAIL
DK06820051.8T DK1960060T3 (en) 2005-12-13 2006-11-14 Fire damper blade
NO20082968A NO338823B1 (en) 2005-12-13 2008-07-04 Brannspjeldblad

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20051277 2005-12-13
FI20051277A FI118457B (en) 2005-12-13 2005-12-13 Fire damper shut-off flap

Publications (1)

Publication Number Publication Date
WO2007068786A1 true WO2007068786A1 (en) 2007-06-21

Family

ID=35510644

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2006/000370 WO2007068786A1 (en) 2005-12-13 2006-11-14 Fire damper blade

Country Status (6)

Country Link
EP (1) EP1960060B1 (en)
AT (1) ATE518568T1 (en)
DK (1) DK1960060T3 (en)
FI (1) FI118457B (en)
NO (1) NO338823B1 (en)
WO (1) WO2007068786A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2062617A1 (en) * 2007-08-01 2009-05-27 Ruskin Air Management Limited A damper
EP2229984A1 (en) * 2009-03-17 2010-09-22 Ciat Sp. z o. o. Cut-off firewall of a rectangular cross-section comprising a partition with a sealing
EP2239014A1 (en) 2009-04-06 2010-10-13 Rf-Technologies nv Fire damper
BE1018652A5 (en) * 2008-02-08 2011-06-07 Halton Oy FIRE AND ANTI-SMOKE VALVE.
EP2450642A1 (en) * 2010-11-09 2012-05-09 Rf-Technologies nv Smoke-ejection shutter with gate
EP2741022A1 (en) * 2012-12-04 2014-06-11 Rf-Technologies nv Smoke evacuation damper comprising a piece of intumescent material
EP2823862A1 (en) 2013-07-10 2015-01-14 Ekovent Ab Damper assembly for ventilation system
EP3299740A1 (en) 2016-09-22 2018-03-28 Trox GmbH Louvre for use in a conduit of an air conditioning system or a mechanical smoke ventilation assembly
EP3984602A1 (en) 2020-10-19 2022-04-20 Ekovent Ab Fire damper for ventilation system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2778554A1 (en) * 2013-03-11 2014-09-17 TROX GmbH Shutoff valve for use in a conduit of an air conditioning system or a mechanical smoke ventilation assembly
DK3101363T3 (en) * 2015-06-01 2020-02-17 Trox Gmbh Geb Shut-off valve for use in a duct in an air-conditioning system or an installation for mechanical smoke removal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1342778A (en) * 1970-06-20 1974-01-03 Trox Gmbh Geb Closure device for fire panels in ventilation and air-conditioning plants
EP0447944A1 (en) * 1990-03-17 1991-09-25 Schako Metallwarenfabrik Ferdinand Schad Kg Fire protection flap
GB2259249A (en) * 1991-08-23 1993-03-10 Halton Oy Fire damper and method of sealing a closing element of a fire damper
EP1038555A2 (en) 1999-03-20 2000-09-27 Gebrüder Trox, Gesellschaft mit beschränkter Haftung Fire damper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1342778A (en) * 1970-06-20 1974-01-03 Trox Gmbh Geb Closure device for fire panels in ventilation and air-conditioning plants
EP0447944A1 (en) * 1990-03-17 1991-09-25 Schako Metallwarenfabrik Ferdinand Schad Kg Fire protection flap
GB2259249A (en) * 1991-08-23 1993-03-10 Halton Oy Fire damper and method of sealing a closing element of a fire damper
EP1038555A2 (en) 1999-03-20 2000-09-27 Gebrüder Trox, Gesellschaft mit beschränkter Haftung Fire damper

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2062617A1 (en) * 2007-08-01 2009-05-27 Ruskin Air Management Limited A damper
BE1018652A5 (en) * 2008-02-08 2011-06-07 Halton Oy FIRE AND ANTI-SMOKE VALVE.
EP2229984A1 (en) * 2009-03-17 2010-09-22 Ciat Sp. z o. o. Cut-off firewall of a rectangular cross-section comprising a partition with a sealing
EP2239014A1 (en) 2009-04-06 2010-10-13 Rf-Technologies nv Fire damper
EP2450642A1 (en) * 2010-11-09 2012-05-09 Rf-Technologies nv Smoke-ejection shutter with gate
FR2967178A1 (en) * 2010-11-09 2012-05-11 Rf Technologies PORTILON DISENGINE COMPONENT
EP2741022A1 (en) * 2012-12-04 2014-06-11 Rf-Technologies nv Smoke evacuation damper comprising a piece of intumescent material
EP2823862A1 (en) 2013-07-10 2015-01-14 Ekovent Ab Damper assembly for ventilation system
EP3299740A1 (en) 2016-09-22 2018-03-28 Trox GmbH Louvre for use in a conduit of an air conditioning system or a mechanical smoke ventilation assembly
EP3984602A1 (en) 2020-10-19 2022-04-20 Ekovent Ab Fire damper for ventilation system

Also Published As

Publication number Publication date
EP1960060A4 (en) 2009-12-30
NO20082968L (en) 2008-07-04
DK1960060T3 (en) 2011-10-31
FI20051277A0 (en) 2005-12-13
EP1960060B1 (en) 2011-08-03
FI118457B (en) 2007-11-30
ATE518568T1 (en) 2011-08-15
FI20051277A (en) 2007-06-14
NO338823B1 (en) 2016-10-24
EP1960060A1 (en) 2008-08-27

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