EP0488978A1 - Clapet coupe-feu - Google Patents

Clapet coupe-feu Download PDF

Info

Publication number
EP0488978A1
EP0488978A1 EP91850296A EP91850296A EP0488978A1 EP 0488978 A1 EP0488978 A1 EP 0488978A1 EP 91850296 A EP91850296 A EP 91850296A EP 91850296 A EP91850296 A EP 91850296A EP 0488978 A1 EP0488978 A1 EP 0488978A1
Authority
EP
European Patent Office
Prior art keywords
disc
damper
tube
thread
intended
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP91850296A
Other languages
German (de)
English (en)
Inventor
Lars Valdemarsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BLOMDAHLS MEKANISKA AB
Original Assignee
BLOMDAHLS MEKANISKA 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 BLOMDAHLS MEKANISKA AB filed Critical BLOMDAHLS MEKANISKA AB
Publication of EP0488978A1 publication Critical patent/EP0488978A1/fr
Withdrawn legal-status Critical Current

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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 present invention relates to a fire damper for use in a ventilation duct, between a kitchen fan and the surroundings.
  • the present invention solves the aforesaid problem with the aid of a device which will prevent fire from spreading via the ventilation duct.
  • the present invention relates to a fire damper for use in a ventilation duct between a kitchen fan of the kind which is mounted above a kitchen stove, and the surroundings, said damper having the form of a rotational damper which comprises a disc that can be rotated about an axle which extends along a diameter of a tube forming part of the ventilation duct, said disc being mounted for rotation between an open position in which the plane of the disc coincides with the longitudinal axis of the tube and a closed position in which the disc is positioned transversely of the duct and therewith closes the same, and is characterized in that the disc is spring-biased towards its closed position; in that the disc is held in an open position by means of a safety device which extends between the edge of the baffle and the tube wall; and in that the safety device includes a meltable element, or melt fuse, which melts at a predetermined, elevated temperature, and a flame guard which includes a readily ignited thread.
  • a rotational damper which comprises a disc that can be rotated about an
  • the drawings illustrate a fire damper for use in a ventilation duct extending between a kitchen fan of the kind which is placed above a stove, and the surroundings.
  • the damper is a rotatable damper which includes a disc 2 which is mounted for rotation about an axle 4 extending along a diameter of a tube or pipe 1 forming part of the ventilation duct.
  • the disc 2 can be rotated between an open position, see Figures 2 and 6, in which the plane of the disc coincides with the long axis of the tube 1, and a closed position, see Figures 4 and 6, in which the disc 2 lies transversely to the duct and therewith closes the same.
  • the damper 2, 4 is biased by a spring 3 towards its closed position.
  • the damper 2, 4 is held open by means of a thread 6 which extends between the edge or rim of the disc 2 and the wall of the tube 1, said thread including a meltable fuse 8 which melts when exposed to a predetermined, elevated temperature.
  • the damper axle 4 is angled externally of the tube 1, such as to present an L-shaped axle-part 10 externally of said tube.
  • the spring 3 is preferably a helical spring and, according to one preferred embodiment of the invention, is placed on the outside of the tube 1.
  • the spring is intended to act on the L-shaped part 10 of the axle 4 and therewith strive to close the disc 2.
  • the damper When the damper is closed, it rests on a stop shoulder 7 firmly mounted on the inner wall of the tube 1.
  • melt fuse shall melt at a predetermined temperature.
  • a suitable temperature in this regard may be 150°C to 200°C. This temperature range exceeds the temperatures normally occurring above a kitchen stove. Such a high increase in temperature may be caused by a fire on the stove or in the vicinity of the stove, but can also be the result of overheating in the absence of an actual fire.
  • the melt fuse may consist of a lead alloy or tin alloy which will melt at a predetermined temperature.
  • a plastic material can be used.
  • the temperatures at which different metals melt is well known, and consequently the person skilled in this art will have no difficulty in choosing an appropriate material which will melt at the desired temperature.
  • the whole of the thread, or a part 9 thereof may consist of a combustible material.
  • a suitable material in this respect in cotton wool, or some other similar, combustible material.
  • the fuse or safety device comprises a first, a second and a third metal tongues 15, 16, 17, of which a first metal tongue 15 is L-shaped at its free end, which end extends through a slot 18 in the wall of the tube 1, and of which a third tongue 17 is also L-shaped at its free end, this end extending through a slot 19 in the disc 2. Because of their L-shapes, the tongues 15, 17 are held in relation to the tube 1 and the disc 2 respectively, see Figure 9, where the disc is thus held in its open position.
  • the second tongue 16 extends between the first tongue 15 and the third tongue 17.
  • the second tongue 16 is soldered 20 to the first tongue 15, the solder used consisting of an alloy which will melt at relatively low temperatures, for example at 150°C to 200°C.
  • the solder may consist of a substance which will melt at a lower temperature, for instance a temperature of 100°C.
  • the end of the second tongue 16 opposite the solder join 20 is bent to include a V-shaped part 21.
  • the end of the third tongue remote from the disc 2 is also bent so as to include a V-shaped part 22.
  • the thread 23 is intended to function as a flame guard, and is therefore made of a readily combusted material.
  • the thread consists of nitrated yarn, which is readily ignited when exposed to a flame.
  • nitrated yarn can be obtained, inter alia, from the company Tempus AB, Sweden.
  • a thread 23 of less inflammable material is tied around the V-shaped parts, whereafter one or more turns of nitrated yarn are wound around the thread.
  • the nitrated yarn is not load-bearing, but is merely intended to ignite when exposed to a flame, and therewith to burn the thread 23 of less inflammable material.
  • the tongues 15, 16, 17 are preferably made of a material which has a high thermal conductivity, such as copper or brass, so that the solder 20 will melt as quickly as possible when the temperature in the ventilation duct exceeds the melting point of the solder.
  • the inventive damper may, of course, be installed in a factory in which kitchen fans are manufactured. According to one preferred embodiment, however, the damper is intended to be fitted to existing kitchen fans.
  • the damper is mounted in a pipe whose one end 11 is intended to be connected to a pipe connector provided on the upper part of a kitchen fan for the departure of exhaust air from said fan, and the other end 12 of which is intended for connection to the inlet end of a ventilation duct.
  • an electric microswitch 5 is positioned adjacent that part 10 of the damper axle 4 which is located on the outside of said tube 1, this microswitch 5 being activated when the disc 2 is rotated from its open position to its closed position.
  • the microswitch 5 may include, for example, a leaf spring 13 which abuts a contact 14 of the microswitch when the damper is open. When the part 10 is rotated, the leaf spring is moved away from the contact 14, thereby activating the microswitch.
  • the microswitch 5 is intended to form part of an electric alarm circuit. Such alarm circuits are well known to the art and do not need to described in detail here.
  • damper may be constructed in other ways.
  • thread and melt fuse may be given other configurations and attached relatively to the damper and the tube in other ways without departing from the aforedescribed function.

Landscapes

  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Air-Flow Control Members (AREA)
EP91850296A 1990-11-28 1991-11-28 Clapet coupe-feu Withdrawn EP0488978A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9003794A SE467341B (sv) 1990-11-28 1990-11-28 Eldspjaell
SE9003794 1990-11-28

Publications (1)

Publication Number Publication Date
EP0488978A1 true EP0488978A1 (fr) 1992-06-03

Family

ID=20381038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91850296A Withdrawn EP0488978A1 (fr) 1990-11-28 1991-11-28 Clapet coupe-feu

Country Status (2)

Country Link
EP (1) EP0488978A1 (fr)
SE (1) SE467341B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2102944A1 (es) * 1993-05-13 1997-08-01 Gen Electric Dispositivo para prevenir el peligro de explosion del nitrato de amonio.
FR2754460A1 (fr) * 1996-10-14 1998-04-17 Eidmann Jurgen F Ensemble coupe-feu, cartouche et coquille en faisant partie et procede pour munir le reseau aeraulique d'un tel ensemble
EP1779901A3 (fr) * 2005-10-27 2010-03-10 Ciat Sp. z o. o. Clapet coupe-feu
GB2509051A (en) * 2012-11-16 2014-06-25 Bsb Engineering Services Ltd Fire damper arrangement
CN109958808A (zh) * 2019-03-04 2019-07-02 山东中科恒基建材有限公司 防火阀执行机构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2242999A1 (fr) * 1973-09-12 1975-04-04 Futurumverken Ab
DE8805225U1 (de) * 1988-04-20 1988-07-21 Friedrich Rathgeber KG Regeltechnik, 6349 Mittenaar Thermisch steuerbare Absperreinrichtung in Rohrleitungen für gasförmige Strömungsmedien
DE3933997A1 (de) * 1988-10-12 1990-05-17 Hofer Josef Fa Brandabschlussmanschette
US4958687A (en) * 1988-12-15 1990-09-25 Daito Tech Kabushiki Kaisha Fire damper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2242999A1 (fr) * 1973-09-12 1975-04-04 Futurumverken Ab
DE8805225U1 (de) * 1988-04-20 1988-07-21 Friedrich Rathgeber KG Regeltechnik, 6349 Mittenaar Thermisch steuerbare Absperreinrichtung in Rohrleitungen für gasförmige Strömungsmedien
DE3933997A1 (de) * 1988-10-12 1990-05-17 Hofer Josef Fa Brandabschlussmanschette
US4958687A (en) * 1988-12-15 1990-09-25 Daito Tech Kabushiki Kaisha Fire damper

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2102944A1 (es) * 1993-05-13 1997-08-01 Gen Electric Dispositivo para prevenir el peligro de explosion del nitrato de amonio.
FR2754460A1 (fr) * 1996-10-14 1998-04-17 Eidmann Jurgen F Ensemble coupe-feu, cartouche et coquille en faisant partie et procede pour munir le reseau aeraulique d'un tel ensemble
EP1779901A3 (fr) * 2005-10-27 2010-03-10 Ciat Sp. z o. o. Clapet coupe-feu
GB2509051A (en) * 2012-11-16 2014-06-25 Bsb Engineering Services Ltd Fire damper arrangement
CN109958808A (zh) * 2019-03-04 2019-07-02 山东中科恒基建材有限公司 防火阀执行机构

Also Published As

Publication number Publication date
SE9003794D0 (sv) 1990-11-28
SE467341B (sv) 1992-07-06

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Effective date: 19960217