EP0055665A1 - Process for avoiding heat damage to the motor of an emergency smoke extractor ventilator, and apparatus for the realization of that process - Google Patents

Process for avoiding heat damage to the motor of an emergency smoke extractor ventilator, and apparatus for the realization of that process Download PDF

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Publication number
EP0055665A1
EP0055665A1 EP81402059A EP81402059A EP0055665A1 EP 0055665 A1 EP0055665 A1 EP 0055665A1 EP 81402059 A EP81402059 A EP 81402059A EP 81402059 A EP81402059 A EP 81402059A EP 0055665 A1 EP0055665 A1 EP 0055665A1
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EP
European Patent Office
Prior art keywords
protective cover
motor
ventilator
cover
aerator
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.)
Granted
Application number
EP81402059A
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German (de)
French (fr)
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EP0055665B1 (en
Inventor
Pierre Avril
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.)
Jeumont Schneider SA
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Jeumont Schneider SA
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 Jeumont Schneider SA filed Critical Jeumont Schneider SA
Priority to AT81402059T priority Critical patent/ATE10435T1/en
Publication of EP0055665A1 publication Critical patent/EP0055665A1/en
Application granted granted Critical
Publication of EP0055665B1 publication Critical patent/EP0055665B1/en
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/14—Fire prevention, containment or extinguishing specially adapted for particular objects or places in connection with doors, windows, ventilators, partitions, or shutters, e.g. automatic closing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/02—Roof ventilation
    • F24F7/025—Roof ventilation with forced air circulation by means of a built-in ventilator
    • 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
    • F24F11/34—Responding to malfunctions or emergencies to fire, excessive heat or smoke by opening air passages

Definitions

  • the present invention relates, on the one hand, to a method for removing from accidental thermal stresses an aerator fan motor mounted with a protective cover at the end of an exhaust duct, for example on the roof of a building, and capable of evacuating hot smoke in the event of a fire inside the building, for example smoke at 400 ° C for two hours without the fan flow falling by more than 10%.
  • the aerator fan drive motor does not need to be specially designed or to be oversized, that is to say provided to withstand abnormal heating or provided with an auxiliary device.
  • cooling supply of fresh air automatically activated in the event of fire or provided in a thermally insulated compartment, as is the case with known equipment of this kind.
  • the invention also relates to the device for implementing this method.
  • the ventilator ventilator it is possible to use, to drive the ventilator ventilator, a motor of normal construction, suspended in a normal manner, without dampers, with a protective cover made of polyester resin, instead of a metallic cover, as is the case. case for known material of this kind.
  • the method according to the present invention is characterized in that, when hot fumes appear, the protective cover is removed from said motor so as to place said motor in an ambient cooling environment little different from that corresponding to its normal running.
  • the device according to the present invention for the implementation of this process, is characterized in that it comprises a temperature detector triggering, in the event of a sudden rise in the temperature of the gases evacuated by the aerator, the setting in action of a member for removing the protective cover and of a member holding the cover away from the motor-ventilator fan assembly at the end of its travel.
  • the temperature detector can advantageously be produced in the form of a means of fixing the protective cover to the motor-ventilator fan assembly, this fixing means being made of fusible material melting under the action of hot smoke and being combined with a member for removing the protective cover produced in the form of a spring mechanism permanently exerting a force tending to project this cover outwards, the fusion of the fixing means releasing the action of this force.
  • the motor 1 with a vertical axis rests on a plate 2 fixed with flat irons 3 on the suction flange 4 disposed at the top of the evacuation sheath (not shown in the drawing).
  • a centrifugal turbine 5 is fixed to the lower shaft end 6 of the motor 1.
  • the clearance 7 formed between the flange 4 and the turbine 5 is calculated to take account of the deformations possible of these two parts under the effect of heat when the ventilator ventilator must evacuate hot fumes following a fire.
  • a protective cover for example in two parts 8 and 9 connected by bolts 10, surrounds the motor-ventilator ventilator assembly, except that its upper part is open and provided with a protective mesh 11.
  • Vertical guide rods 12 are fixed at their lower part to the flat bars 3 and are of height slightly less than that of the protective cover 8-9. They pass through the brackets 13 fixed to the part 8 of this cover by bolts. Below these brackets 13 the rods 12 are surrounded by a cylindrical compression spring 14. Just above the brackets 13, the rods 12 are pierced with a transverse hole for the passage of a pin 15 of fusible alloy of known type melting at a temperature lower than that of hot smoke following a fire, for example at 70 ° C.
  • Figure 3 gives a detailed view of the guide rods 12 in the form of tubes provided with a thrust washer 16 at their upper part.
  • the pin 15 maintains the spring 14 in compression.
  • the protective cover is thus fixed in position by the brackets 13 so as to abut at its lower part against the flat irons 3.
  • the pin 15 melts, the action of the spring projects the cover towards the high.
  • the brackets 13 arrive at the top of the rods 12 against the stops 16.
  • a locking at the end of travel of the cover such as a pawl or a ball placed in the top of the rod 12 (not shown in the drawing), blocks these brackets and therefore maintains the hood in the raised position.
  • the engine 1 is thus placed in an ambient cooling environment little different from that corresponding to its normal operation.
  • the type of motor used can then be normal from the point of view of the heating of its windings.
  • the fixing of the lugs 19 to the flat irons 3 is done using bolts 20 of fusible alloy (not shown) of the same kind as that used for the pins 15.
  • bolts 20 of fusible alloy not shown
  • the spring 18 ejects the cap 17 away from the motor-ventilator fan assembly.
  • a retaining chain 21 fixed on one side to the cap 17 and on the other for example to the suction flange 4 prevents the cap 17 from possibly falling on passers-by.
  • the protective mesh 22 is not integral with the cap 17 and remains in place.

Abstract

A protective cover for an exhaust fan motor or the like actuable to withdraw the same by normally restrained positive pressure from the motor upon the monitoring of hot fumes representing a fire, thereby to expose the motor to a cooling environment little different from or substantially the same as that of its normal operation.

Description

La présente invention concerne d'une part un procédé pour soustraire aux contraintes thermiques accidentelles un moteur de ventilateur aérateur monté avec un capot de protection à l'extrémité d'une gaine d'évacuation, par exemple sur le toit d'un bâtiment, et capable d'évacuer des fumées chaudes en cas d'incendie à l'intérieur du bâtiment, par exemple des fumées à 400° C pendant deux heures sans que le débit du ventilateur baisse de plus de 10%.The present invention relates, on the one hand, to a method for removing from accidental thermal stresses an aerator fan motor mounted with a protective cover at the end of an exhaust duct, for example on the roof of a building, and capable of evacuating hot smoke in the event of a fire inside the building, for example smoke at 400 ° C for two hours without the fan flow falling by more than 10%.

Selon l'invention, le moteur d'entraînement du ventilateur aérateur n'a pas besoin d'être spécialement conçu ou d'être surdimensionné, c'est-à-dire prévu pour résister à un échauffement anormal ou prévu avec un dispositif auxiliaire de refroidissement (amenée d'air frais) mis automatiquement en action en cas d'incendie ou prévu dans un compartiment isolé thermiquement, comme cela est le cas pour le matériel connu de ce genre.According to the invention, the aerator fan drive motor does not need to be specially designed or to be oversized, that is to say provided to withstand abnormal heating or provided with an auxiliary device. cooling (supply of fresh air) automatically activated in the event of fire or provided in a thermally insulated compartment, as is the case with known equipment of this kind.

L'invention concerne d'autre part le dispositif pour la mise en oeuvre de ce procédé.The invention also relates to the device for implementing this method.

Selon l'invention, on peut utiliser, pour entraîner le ventilateur aérateur, un moteur de construction normale, suspendu de manière normale, sans amortisseurs, avec un capot de protection en résine polyester, au lieu d'un capot métallique, comme cela est le cas pour le matériel connu de ce genre.According to the invention, it is possible to use, to drive the ventilator ventilator, a motor of normal construction, suspended in a normal manner, without dampers, with a protective cover made of polyester resin, instead of a metallic cover, as is the case. case for known material of this kind.

Le procédé, selon la présente invention, est caractérisé en ce que, lors de l'apparition de fumées chaudes, on éloigne dudit moteur le capot de protection de manière à placer ledit moteur dans un milieu ambiant de refroidissement peu différent de celui correspondant à son fonctionnement normal.The method according to the present invention is characterized in that, when hot fumes appear, the protective cover is removed from said motor so as to place said motor in an ambient cooling environment little different from that corresponding to its normal running.

Le dispositif, selon la présente invention, pour la mise en oeuvre de ce procédé, est caractérisé en ce qu'il comporte un détecteur de température déclenchant, en cas de montée brutale de la température des gaz évacués par l'aérateur, la mise en action d'un organe d'éloignement du capot de protection et d'un organe maintenant en bout de course le capot éloigné de l'ensemble moteur-ventilateur aérateur.The device according to the present invention, for the implementation of this process, is characterized in that it comprises a temperature detector triggering, in the event of a sudden rise in the temperature of the gases evacuated by the aerator, the setting in action of a member for removing the protective cover and of a member holding the cover away from the motor-ventilator fan assembly at the end of its travel.

Le détecteur de température peut être avantageusement réalisé sous la forme d'un moyen de fixation du capot de protection sur l'ensemble moteur-ventilateur aérateur, ce moyen de fixation étant en matière fusible fondant sous l'action des fumées chaudes et étant combiné à un organe d'éloignement du capot de protection réalisé sous la forme d'un mécanisme à ressort exerçant en permanence une force tendant à projeter ce capot vers l'extérieur, la fusion du moyen de fixation libérant l'action de cette force.The temperature detector can advantageously be produced in the form of a means of fixing the protective cover to the motor-ventilator fan assembly, this fixing means being made of fusible material melting under the action of hot smoke and being combined with a member for removing the protective cover produced in the form of a spring mechanism permanently exerting a force tending to project this cover outwards, the fusion of the fixing means releasing the action of this force.

L'invention sera mieux comprise à l'aide d'exemples de réalisation et des dessins annexés où :

  • - la figure 1 représente un ensemble moteur-ventilateur aérateur à axe vertical ayant un capot de protection périphérique permettant le refoulement des gaz verticalement vers le haut,
  • - la figure 2, une variante de la figure 1 avec une calotte de protection provoquant le refoulement latéral des gaz,
  • - la figure 3, le détail du moyen de fixation du capot de protection de la figure 1.
The invention will be better understood with the aid of exemplary embodiments and the accompanying drawings in which:
  • FIG. 1 represents a motor-ventilator aerator assembly with a vertical axis having a peripheral protective cover allowing the discharge of gases vertically upwards,
  • FIG. 2, a variant of FIG. 1 with a protective cap causing the side discharge of the gases,
  • - Figure 3, the detail of the fixing means of the protective cover of Figure 1.

Sur la figure 1, le moteur 1 à axe vertical repose sur une platine 2 fixée à l'aide de fers plats 3 sur la bride d'aspiration 4 disposée au sommet de la gaine d'évacuation (non représentée sur le dessin). Une turbine centrifuge 5 est fixée sur le bout d'arbre inférieur 6 du moteur 1. Le jeu 7 ménagé entre la bride 4 et la turbine 5 est calculé pour tenir compte des déformations éventuelles de ces deux pièces sous l'effet de la chaleur lorsque le ventilateur aérateur doit évacuer des fumées chaudes consécutives à un incendie. Un capot de protection, par exemple en deux parties 8 et 9 reliées par des boulons 10, entoure l'ensemble moteur-ventilateur aérateur, sauf que sa partie supérieure est ouverte et munie d'un grillage 11 de protection.In Figure 1, the motor 1 with a vertical axis rests on a plate 2 fixed with flat irons 3 on the suction flange 4 disposed at the top of the evacuation sheath (not shown in the drawing). A centrifugal turbine 5 is fixed to the lower shaft end 6 of the motor 1. The clearance 7 formed between the flange 4 and the turbine 5 is calculated to take account of the deformations possible of these two parts under the effect of heat when the ventilator ventilator must evacuate hot fumes following a fire. A protective cover, for example in two parts 8 and 9 connected by bolts 10, surrounds the motor-ventilator ventilator assembly, except that its upper part is open and provided with a protective mesh 11.

Des tiges de guidage verticales 12, au nombre de quatre par exemple, sont fixées à leur partie inférieure aux fers plats 3 et sont de hauteur légèrement inférieure à celle du capot de protection 8-9. Elles traversent des équerres 13 fixées à la partie 8 de ce capot par des boulons. Au-dessous de ces équerres 13 les tiges 12 sont entourées par un ressort cylindrique de compression 14. Juste au-dessus dés équerres 13, les tiges 12 sont percées d'un trou transversal pour le passage d'une goupille 15 en alliage fusible de type connu fondant à une température inférieure à celle des fumées chaudes consécutives à un incendie, par exemple à 70°C.Vertical guide rods 12, four in number for example, are fixed at their lower part to the flat bars 3 and are of height slightly less than that of the protective cover 8-9. They pass through the brackets 13 fixed to the part 8 of this cover by bolts. Below these brackets 13 the rods 12 are surrounded by a cylindrical compression spring 14. Just above the brackets 13, the rods 12 are pierced with a transverse hole for the passage of a pin 15 of fusible alloy of known type melting at a temperature lower than that of hot smoke following a fire, for example at 70 ° C.

La figure 3 donne une vue détaillée des tiges de guidage 12 sous forme de tubes munis d'une rondelle de butée 16 à leur partie supérieure. La goupille 15 maintient le ressort 14 en compression. Le capot de protection est ainsi fixé en position par les équerres 13 de manière à buter à sa partie inférieure contre les fers plats 3. Lorsque, en cas d'incendie, la goupille 15 fond, l'action du ressort projette le capot vers le haut. Les équerres 13 arrivent en haut des tiges 12 contre les butées 16. Un verrouillage en bout de course du capot, tel qu'un cliquet ou une bille disposés dans le haut de la tige 12(non représentés sur le dessin), bloque ces équerres et maintient donc le capot en position surélevée. Le moteur 1 est ainsi placé dans un milieu ambiant de refroidissement peu différent de celui correspondant à son fonctionnement normal. Le type de moteur utilisé peut alors être normal au point de vue des échauffements de ses enroulements.Figure 3 gives a detailed view of the guide rods 12 in the form of tubes provided with a thrust washer 16 at their upper part. The pin 15 maintains the spring 14 in compression. The protective cover is thus fixed in position by the brackets 13 so as to abut at its lower part against the flat irons 3. When, in the event of a fire, the pin 15 melts, the action of the spring projects the cover towards the high. The brackets 13 arrive at the top of the rods 12 against the stops 16. A locking at the end of travel of the cover, such as a pawl or a ball placed in the top of the rod 12 (not shown in the drawing), blocks these brackets and therefore maintains the hood in the raised position. The engine 1 is thus placed in an ambient cooling environment little different from that corresponding to its normal operation. The type of motor used can then be normal from the point of view of the heating of its windings.

On retrouve sur la variante de la figure 2 la majeure partie des composants de la figure 1, sauf que le capot 8-9 est remplacé par une calotte 17, que les ressorts 14 sont remplacés par un ressort unique 18 monté à la partie supérieure du moteur 1 et que le moyen de fixation de la calotte 17 est réalisé à l'aide de pattes 19 fixées d'un côté à cette calotte et de l'autre côté sur les fers plats 3 par dessus la platine 2, elle-même fixée de façon indépendante aux fers plats 3.We find in the variant of Figure 2 most of the components of Figure 1, except that the cover 8-9 is replaced by a cap 17, the springs 14 are replaced by a single spring 18 mounted at the top of the motor 1 and that the means for fixing the cap 17 is produced by means of lugs 19 fixed on one side to this cap and on the other side on the flat irons 3 above the plate 2, itself fixed independently with flat irons 3.

La fixation des pattes 19 aux fers plats 3 se fait à l'aide de boulons 20 en alliage fusible (non représentés) de même genre que celui utilisé pour les goupilles 15. Lorsque ces boulons fondent sous l'effet des fumées chaudes, le ressort 18 éjecte la calotte 17 loin de l'ensemble moteur-ventilateur aérateur. Une chaîne de retenue 21 fixée d'un côté à la calotte 17 et de l'autre par exemple à la bride d'aspiration 4 empêche la calotte 17 de retomber éventuellement sur des passants. Le grillage de protection 22 n'est pas solidaire de la calotte 17 et reste en place.The fixing of the lugs 19 to the flat irons 3 is done using bolts 20 of fusible alloy (not shown) of the same kind as that used for the pins 15. When these bolts melt under the effect of hot smoke, the spring 18 ejects the cap 17 away from the motor-ventilator fan assembly. A retaining chain 21 fixed on one side to the cap 17 and on the other for example to the suction flange 4 prevents the cap 17 from possibly falling on passers-by. The protective mesh 22 is not integral with the cap 17 and remains in place.

Bien que deux modes de réalisation aient été précédemment décrits, il est évident que toute modification apportée par l'Homme de métier conformément à l'esprit de l'invention ne sortirait pas du champ d'application de celle-ci.Although two embodiments have been previously described, it is obvious that any modification made by those skilled in the art in accordance with the spirit of the invention would not go beyond the scope of the latter.

Claims (5)

1.- Procédé pour soustraire aux contraintes thermiques accidentelles un moteur de ventilateur aérateur monté avec un capot de protection à l'extrémité d'une gaine d'évacuation, par exemple sur le toit d'un bâtiment, et capable d'évacuer des fumées chaudes en cas d'incendie à l'intérieur du bâtiment, caractérisé en ce que, lors de l'apparition de fumées chaudes, on éloigne dudit moteur le capot de protection de manière à placer ledit moteur dans un milieu ambiant de refroidissement peu différent de celui correspondant à son fonctionnement normal.1.- Method for removing from accidental thermal stresses an aerator fan motor mounted with a protective cover at the end of an exhaust duct, for example on the roof of a building, and capable of evacuating fumes hot in the event of a fire inside the building, characterized in that, when hot fumes appear, the protective cover is removed from said engine so as to place said engine in an ambient cooling environment little different from that corresponding to its normal operation. 2.- Dispositif pour la mise en oeuvre du procédé conforme à la revendication 1, caractérisé en ce qu'il comporte un détecteur de température déclenchant, en cas de montée brutale de la température des gaz évacués par ledit aérateur, la mise en action d'un organe d'éloignement du capot de protection et d'un organe maintenant en bout de course le capot éloigné de l'ensemble moteur-ventilateur aérateur.2.- Device for implementing the method according to claim 1, characterized in that it comprises a temperature detector triggering, in the event of a sudden rise in the temperature of the gases evacuated by said aerator, the activation of 'A member for removing the protective cover and a member holding the end of the cover away from the motor-ventilator fan assembly. 3.- Dispositif selon la revendication 2, caractérisé en ce que le détecteur de température est réalisé sous la forme d'un moyen de fixation du capot de protection (8-9) sur l'ensemble moteur-ventilateur aérateur (1-2-6-5), ledit moyen de fixation (15 ou 20) étant en matière fusible fondant sous l'action des fumées chaudes, et en ce que l'organe d'éloignement du capot de protection est un mécanisme à ressort (14 ou 18) exerçant en permanence une force tendant à projeter ledit capot vers l'extérieur, la fusion dudit moyen de fixation libérant l'action de cette force.3.- Device according to claim 2, characterized in that the temperature detector is produced in the form of a means of fixing the protective cover (8-9) on the motor-ventilator ventilator assembly (1-2- 6-5), said fixing means (15 or 20) being of fusible material melting under the action of hot smoke, and in that the member for removing the protective cover is a spring mechanism (14 or 18 ) permanently exerting a force tending to project said cover outwards, the fusion of said fixing means releasing the action of this force. 4.- Dispositif selon l'une des revendications 2 ou 3, caractérisé en ce qu'il comporte un organe de guidage (12-13) du capot de protection (8-9) de sa position normale vers une position éloignée, ainsi qu'un mécanisme d'arrêt (16) et de blocage en fin de course dudit capot.4.- Device according to one of claims 2 or 3, characterized in that it comprises a guide member (12-13) of the protective cover (8-9) from its normal position to a distant position, as well as 'a stop (16) and end of travel locking mechanism for said cover. 5.- Dispositif selon l'une des revendications 2 ou 3, caractérisé en ce que le capot de protection est une calotte (17) surmontant le ventilateur aérateur et que l'organe maintenant en bout de course le capot éloigné de l'ensemble moteur-ventilateur aérateur est une chaîne de retenue (21).5.- Device according to one of claims 2 or 3, characterized in that the protective cover is a cap (17) surmounting the aerator fan and that the member holding the cover away from the motor assembly at the end of its travel - ventilator ventilator is a retaining chain (21).
EP81402059A 1980-12-31 1981-12-23 Process for avoiding heat damage to the motor of an emergency smoke extractor ventilator, and apparatus for the realization of that process Expired EP0055665B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81402059T ATE10435T1 (en) 1980-12-31 1981-12-23 PROCEDURE FOR PREVENTING HEAT DAMAGE TO A FIRE EXHAUST FAN MOTOR AND EQUIPMENT FOR CARRYING OUT THE PROCEDURE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8027915A FR2497299A1 (en) 1980-12-31 1980-12-31 PROCESS FOR PREVENTING ACCIDENTAL THERMAL CONSTRAINTS FROM AN AERATOR FAN MOTOR CAPABLE OF REMOVING HOT FUMES IN THE EVENT OF FIRE AND DEVICE FOR CARRYING OUT SAID METHOD
FR8027915 1980-12-31

Publications (2)

Publication Number Publication Date
EP0055665A1 true EP0055665A1 (en) 1982-07-07
EP0055665B1 EP0055665B1 (en) 1984-11-28

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Application Number Title Priority Date Filing Date
EP81402059A Expired EP0055665B1 (en) 1980-12-31 1981-12-23 Process for avoiding heat damage to the motor of an emergency smoke extractor ventilator, and apparatus for the realization of that process

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US (1) US4494450A (en)
EP (1) EP0055665B1 (en)
AT (1) ATE10435T1 (en)
DE (1) DE3167513D1 (en)
ES (1) ES8300955A1 (en)
FR (1) FR2497299A1 (en)

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US6074181A (en) * 1998-07-09 2000-06-13 Ff Seeley Nominees Pty. Ltd. Shroud for fan motor cooling
EP3239620A1 (en) * 2016-04-28 2017-11-01 Aereco Air extraction fan with variable flow cross-section in case of fire
CN110242594A (en) * 2019-06-24 2019-09-17 绍兴柯桥凯歌电子有限公司 A kind of fire channel smoke quickly detaches device

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US7682231B2 (en) 2004-01-20 2010-03-23 Greenheck Fan Corporation Exhaust fan assembly
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DE102006012356A1 (en) * 2006-03-17 2007-09-20 Gebhardt Ventilatoren Gmbh & Co. Kg Fan assembly has a fan holding plate, at least twice the size of the air inlet, acting as a diffuser for the radial air outflow
US7673430B1 (en) 2006-08-10 2010-03-09 Koninklijke Philips Electronics, N.V Recessed wall-wash staggered mounting system
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Publication number Priority date Publication date Assignee Title
US6074181A (en) * 1998-07-09 2000-06-13 Ff Seeley Nominees Pty. Ltd. Shroud for fan motor cooling
EP3239620A1 (en) * 2016-04-28 2017-11-01 Aereco Air extraction fan with variable flow cross-section in case of fire
FR3050808A1 (en) * 2016-04-28 2017-11-03 Aereco AIR EXTRACTION FAN WITH VARIABLE PASSAGE SECTION IN CASE OF FIRE
RU2734377C2 (en) * 2016-04-28 2020-10-15 Аэреко Exhaust fan with flow cross-section varying in case of fire
CN110242594A (en) * 2019-06-24 2019-09-17 绍兴柯桥凯歌电子有限公司 A kind of fire channel smoke quickly detaches device

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Publication number Publication date
FR2497299A1 (en) 1982-07-02
DE3167513D1 (en) 1985-01-10
ATE10435T1 (en) 1984-12-15
ES507655A0 (en) 1982-11-01
ES8300955A1 (en) 1982-11-01
EP0055665B1 (en) 1984-11-28
FR2497299B1 (en) 1983-01-21
US4494450A (en) 1985-01-22

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