(ÏÏ) Publication number: Int. Cl.4: A 62 C 35/18, A 62 C 35/02

Transkript

1 ê Europâisches Patentamt European Patent Office Office européen des brevets (ÏÏ) Publication number: B1 EUROPEAN PATENT SPECIFICATION Dateof publication of patent spécification: Int. Cl.4: A 62 C 35/18, A 62 C 35/02 ( ) Application number: (22) Dateoffiling: (M) Fire extinguishing System. CÛ C0 00 N Priority: CA ( ) Date of publication of application: Bulletin 84/19 ( ) Publication of thegrantofthe patent: Bulletin 86/51 Designated Contracting States: AT BE CH DE FR GB IT Ll LU IML SE ( ) Références cited : AU-B DE-B DE-B FR-A GB-A US-A-2 Proprietor: Wormald Fire Systems Inc. 135 Matheson Boulevard Mississauga Ontario L42 1R2 (CA) Inventor: Miller, Walter G Captain Court Mississauga Ontario (CA) Inventor: Macé, Michel 2 Place Talbot Pierrefonds Québec H8Y 1P7 (CA) Inventor: Zitterbart, George 1485 Gulleden Drive Mississauga Ontario (CA) 7Ï) Représentative: von Raffay, Vincenz, Dipl.-lng. et al Patentanwâlte Raffay, Fleck & Partner Postfach D-2000 Hamburg 13 (DE) CL LU Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European patent convention). Courier Press, Leamington Spa, England.

2 Field of the Invention The present invention relates to a fire extinguishing system according to the non-characterizing part of claim 1. Such a system is known from DE-B With this known system it is not possible to effect total evacuation of the medium in the tank to the hazard in case of fire. Background of the Invention In enclosures of large sizes, such as rooms where electrical equipment is stored, it is essential that quick and total evacuation of the fire extinguishing medium be effected so as to establish in the entire room an atmosphere in which combustion cannottake place. One evident solution is to install a great number of receptacles storing the pressure medium with a common discharge manifold or delivery line. However, the installation of such a system is extremely costly in addition to taking considerable space. Indeed, each cylinder must be separately equipped with valves, rupture disks and pressure gages, thereby requiring individual maintenance. Furthermore where a large size room may require a hundred or so of these receptacles, it is to be noted that filling time for each with the medium takes, as an average, over one hour. Objects and Statement of the Invention It is an object of the present invention to provide a fire extinguishing system where a single large tank is used where the delivery of the fire extinguishing medium is quick and, in a short time, total evacuation of the fire extinguishing medium is achieved. This object is achieved by the teaching of the characterizing part of claim 1 (feature g). In one preferrred form of the invention, the medium is a liquid halogenated hydrocarbon and the expellant material is nitrogen. The present invention is also concerned with a method of extinguishing fires which comprises the steps of: - maintaining a supply of liquid fire extinguishing medium in the tank under a pressure cushion of expellant material; - initiating delivery of the medium through a delivery line upon detection of a hazard by opening a normally closed valve in the delivery line; and - initiating a sequential operation of a plurality of serially operable groups of expellant containing means in conduit communication with the expellant material in the tank to thereby deliver additional expellant material to the tank to maintain a given pressure in the tank for quick and total evacuation of the medium from the tank to the hazard. The scope of applicability of the present invention will become apparent from the detailed description given hereinafter; it should be understood, however, that this description, while indicating preferred embodiments of the invention, is given by way of illustration only, since various changes and modifications within the scope of the invention will become apparent to those skilled in the art. In the Drawings Fig.1 1 is a diagrammatic view of a fire extinguishing system, illustrating one embodiment of the present invention; and Fig. 2 is a diagrammatic view of the groups of cylinders. Description of Preferred Embodiments As illustrated in the drawings, there is shown a large storage tank 10 which is partially filled with a liquid fire extinguishing medium 12 above which is a cushion of expellant material 14 under pressure. A preferred medium is a liquid halogenated hydrcarbon, such as the one sold under the trade mark HALON 1301, while a preferred expellant material is nitrogen. A fill line 16 is shown at the bottom of the tank for storing the medium in the tank and includes a series of commonly known and used components such as valves, rupture disks, coupling adaptors for the proper filling operation of the tank. Also shown is an equalizing line 18 connected between the tank and the source of medium 12 and equipped with similar known components, such as valves, rupture disks, coupling adaptors, for use during the conventional filling operation of a medium containing tank. A delivery line, generally denoted 20, includes a first portion 22 which extends inside the storage tank with one end 23 terminating adjacent the bottom thereof. A second portion 24 of the delivery line comprises a normally closed remotely operated main valve 26, preferably of the butterfly type, and a second valve 28 which is normally open and is used whenever maintenance is required on the main valve 26. The delivery line portion 24 further includes a rupture disk 30 which is located downstream of the main valve 26 and which is used for detecting any leaks of the fire extinguishing medium which may accidentally pass by valve 26 when closed. An arrangement of pressure detecting device 31, manometer 33 and valves is provided between valve 26 and disk 30 to indicate to a controlling station, generally designated as 34, an increase or decrease in pressure in the delivery line. The remaining portion 32 of the delivery line is connected to a nozzle distributing system (not shown) which is mounted in the environment to be protected. The actuation, i.e. opening, of the butterfly valve 26 is carried out upon receiving a signal transmitted from the controlling station which, in turn, operates upon detection of a fire hazard in the room where the distributing system is located. The station includes a control panel 36, a pneumatic actuator 38, a manometer 40 and a pressure detecting switch 42. The controlling station 34 also includes a series of valves 46,47,48,49, a pressure regulator 50 and a pressure detecting instrument 51. The signal transmitted on line 44 from the con-

3 trolling station 34 is also transmitted on a second line 52 associated with a plurality of groups of containers, five groups having been shown in figure 2 as 53, 54, 55, 56, 57, each group including a series of cylinders (six being shown). The containers of each group are serially connected to a common delivery line 58, 59, 60, 61, 62, respectively, each line being in conduit communication with the upper part of the tank 10 through a common conduit 64 and a valve 66. Mounted to the upper part of the storage tank are a pressure detecting device 68 and a manometer 70, in communication with the tank through respective valves 72 and 74, to detect and measure the pressure therein. The pressure detecting device 68 will indicate a variation in pressure inside the tank and will transmit a signal to the controlling station. An increase of pressure inside the tank will indicate an increase of temperature which will create expansion of the medium inside the tank and/or a leak of the expellant material. A decrease in pressure will indicate a leak of the expellant material or of the fire extinguishing medium and/or a temperature decrease. The first group 53 includes a diaphragm operated valve 75 in the delivery line 58, a pressure detecting device 76 connected to line 58 through a valve 80, a manometer 78 also connected to line 58 through a valve 82. Similar component arrangements are provided for each of the other lines 54, 55, 56 and 57 and have been given letter references to distinguish them from one another. To line 52 are connected solenoid valves 84, 84A, 84B, 84C and 84D which, when operated, actuate respective valves 75, 75A, 75B, 75C and 75D. Solenoid valve 84 is electrically connected to a timer device 86. The other solenoid valves are connected to the timer through respective pressure switches 76, 76A, 76B, 76C and 76D. Connected to the timer are two normally opened contacts 42 and 88 which close in response to a pressure increase in lines 44 and 20 respectively. Timer 86 also includes a pair of contacts 92 (normally closed) and 94 (normally open). A description of the operation of the present system will now be described. Under normal situation, tank 10 contains a quantity of fire extinguishing medium in liquid state which is pressurized by the cushion of expellant material 14. The butterfly valve 26 is normally closed while the rupture disk 30 is in place; valve 28 is open. The opening of butterfly valve 26 is actuated by a pneumatic or electric signal received from the controlling station 34. The number of groups of cylinders of expellant material will correspond to that which is required to assist the cushion of expellant material inside the tank to expel quickly and totally the fire extinguishing medium to the hazard in a desired time interval. Once triggered, the signal received from the controlling station opens the butterfly valve 26. This signal is also sent to the solenoid valves 84, 84A, 84B, 84C and 84D; however, these valves will actuate their corresponding valves 75, 75A, 75B, 75C and 75D only when electrically energized. Solenoid valve 84 will be actuated when timer 86 is energized: this is accomplished when contacts 42 and 88 are closed. Contact 42 is closed when the controlling station sends a signal on line 44 whereas contact 88 is closed when the pressure inside conduit 20 between valves 26 and disc 30 is sufficiently high and detected by switch 88. Timer 86, once energized, will cause and maintain closure of contact 94 for a set delay resulting in actuation of valve 84 and valve 75. This will cause the first group 53 of six cylinders to direct additional expellant material to the tank through conduit 64, the latter acting as an orifice and reducing the pressure of expellant material from a high value inside the containers to a sufficient pressure to expel the medium from the tank. When the pressure of the first group of cylinders decreases and reaches a low value, the contact of pressure detecting device 76 closes to actuate the solenoid valve 84A of the succeeding group of six containers, which valve opens an associated valve 75A to put the expellant material of that group in communication with line 64; and so on, until the last group of containers is emptied. This sequential operation enables to maintain a constant pressure inside the tank during the delivery time. The pressure detecting device 76D of the last or fifth group transmits a signal to the controlling station 34 to indicate total evacuation of the expellant material. The set delay on timer 86 corresponds to the time required for total evacuation of the medium and ensures this continuous electric supply even if contacts 42 and 88 should open. Although the invention has been described above in respect of a specific form, it will be evident to the man skilled in the art that it can be modified and refined in various ways. For example, the gas under pressure in the containers could be air. However, in such a case, air would react with the halogenated hydrocarbon and it would be preferable that the pressure cushion inside the tank be nitrogen while the expellant material outside the tank would be air or any other material under pressure. Also, it is possible to envisage the reserve of expellant material as being a large spherical container. It is therefore wished to have it understood that this invention should not be limited in interpretation except by the terms of the following claims. 1. A fire extinguishing system comprising: (a) a tank (10); (b) a fire extinguishing medium (12) partially filling said tank; (c) an expellant material (14) under pressure in the remaining part of the tank, said material defining a pressure cushion acting on said medium; (d) a delivery line (20) associated with said tank for carrying said medium from said tank to a hazard; (e) valve means in said delivery line including a

4 normally closed main valve (26) operable to deliver said fire extinguishing medium to said hazard; (f) a reserve of expellant containing means (53-57) in conduit communication with said cushion in said tank; characterized by (g) actuator means (34) which is responsive to operate said main valve and which subsequently initiates sequential operation of said expellant containing means to deliver additional expellant material to said tank to maintain a predetermined pressure therein for quick and total evacuation of said medium from said tank to said hazard. 2. Afire extinguishing system as defined in claim 1, wherein said medium (12) is a liquid halogenated hydrocarbon. 3. Afire extinguishing system as defined in claim 1 or 2, wherein said expellant material (14) is nitrogen. 4. Afire extinguishing system as defined in claim 1, wherein said actuator means include means responsive to a signal originating from a controlling station (34) associated with said system. 5. Afire extinguishing system as defined in claim 4, wherein said reserve consists of a plurality of groups of serially connected cylinders (53-57); said groups being successively operable; means (76) associated with each of said groups of cylinders for detecting a given pressure and for switching to a successive group of cylinders. 6. Afire extinguishing system as defined in claim 5, wherein the pressure detecting means (76D) of the last group of cylinders transmits a signal to said controlling station (34) to indicate termination of said expellant delivering operations. 7. Afire extinguishing system as defined in claim 6 comprising time setting means (86) connected to said pressure detecting means (76) for ensuring operation of said pressure detecting means during a time corresponding to said total evacuation. 8. Afire extinguishing system as defined in claim 4 wherein said signal is pneumatic. 9. Afire extinguishing system as defined in claim 1, wherein one end (23) of said delivery line (20) extends to the bottom of said tank. 10. A fire extinguishing system as defined in claim 1, wherein said valve means further includes a second valve upstream of said main valve (26) in said delivery line (20) and a rupture disk (30) therein downstream of said main valve for detecting leak of said medium through said normally closed main valve; said disk being ruptured upon evacuation of said medium through said delivery line. 11. A method of extinguishing a fire comprising the steps of: (a) maintaining a supply of liquid fire extinguishing medium (12) in a tank (10) under a pressure cushion of expellant material (14); (b) initiating delivery of said medium through a delivery line (20) upon detection of a hazard by opening a normally closed valve (26) in said delivery line; (c) initiating the sequential operation of a plurality of serially operable groups of expellant con- tainers (53-57) in conduit communication with said expellant material in said tank to thereby deliver additional expellant material to said tank to maintain a given pressure in said tank for quick and total evacuation of said medium from said tank to said hazard. 12. A method as defined in claim 11, comprising the step of maintaining said expellant material in one group of containers (53-57) until a falling pressure of a preceding group of containers is reached. 13. A method as defined in claim 12, comprising the step of transmitting a signal to a controlling station (34) when the last group of containers (53-57) has reached said falling pressure. 14. A method as defined in claim 11, 12 or 13, wherein said medium is a liquid halogenated hydrocarbon and said expellant material is nitrogen. 1. Feuerlöschsystem mit folgenden Merkmalen: a) ein Tank (10) b) ein Feuerlöschmittel (12), das den Tank zum Teil füllt; c) ein Druck- oder Treibmittel (14) unter Druck in dem restlichen Teil des Tanks, das ein Druckkissen bildet, das auf das Mittel (12) wirkt; d) eine Zulieferleitung (20), die mit dem Tank verbunden ist, um das Mittel (12) von dem Tankzur Gefahrenstelle zu leiten; e) Ventile in der Zulieferleitung einschließlich eines normalerweise geschlossenen Hauptventiles (26), das betätigbar ist, um das Feuerlöschmittel zu der Gefahrenstelle zu liefern; f) ein Reservemittel (53 bis 57), das Druck- oder Treibmittel enthält, und mit dem Kissen in dem Tank (10) in Verbindung steht; gekennzeichnet durch g) eine Betätigungseinrichtung (34), die für die Betätigung des Hauptventiles zuständig ist und die entsprechend einen im Anschluß daran stattfindenden Einsatz der Einrichtung auslösen, die das Druck- oder Treibmittel enthält, um zusätzliches Druck- oder Treibmitte! zu dem Tankzu liefern, um einen vorher bestimmten Druck in diesem aufrechtzuerhalten, damit eine schnelle und vollständige Entleerung des Feuerlöschmittels aus dem Tank zu der Gefahrenstelle stattfindet. 2. Feuerlöschsystem nach Anspruch 1, dadurch gekennzeichnet, daß das Feuerlöschmittel flüssiger Halogenkohlenwasserstoff ist. 3. Feuerlöschsystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß Druck- oder Treibmittel (14) Stickstoff ist. 4. Feuerlöschmittel nach Anspruch 1, dadurch gekennzeichnet, daß das die Betätigungseinrichtung eine Einrichtung aufweist, die auf ein Signal anspricht, das von einer Steuerstation ausgeht, die mit dem System verbunden ist. 5. Feuerlöschsystem nach Anspruch 4, dadurch gekennzeichnet, daß die Reserve eine Anzahl von Gruppen von in Reihe miteinander verbundenen Zylindern (53 bis 57) aufweist, die aufeinander-

5 folgende betätigbar sind, und daß eine Einrichtung (76) mit jeder der Gruppe der Zylinder verbunden ist, um einen vorhergegebenen Druck festzustellen und auf eine folgende Gruppe von Zylindern umzuschalten. 6. Feuerlöschsystem nach Anspruch 5, dadurch gekennzeichnet, daß die druckfeststellende Einrichtung (76D) der letzten Gruppe der Zylinder ein Signal auf die Steuerstation (34) überträgt, um anzuzeigen, daß die Abgabe und Zulieferung von Druck- oder Treibmittel beendet ist. 7. Feuerlöschsystem nach Anspruch 6, dadurch gekennzeichnet, daß eine zeitgebende Einrichtung (86) vorgesehen ist, die mit der druckfeststellenden Einrichtung (76) verbunden ist, um die Arbeitsweise der druckfeststellenden Einrichtung während einer Zeit sicherzustellen, die der gesamten Entleerung entspricht. 8. Feuerlöschsystem nach Anspruch 4, dadurch gekennzeichnet, daß das Signal pneumatisch ist. 9. Feuerlöschsystem nach Anspruch 1, dadurch gekennzeichnet, daß das eine Ende (23) der Zulieferleitung (20) bis zum Boden des Tanks verläuft. 10. Feuerlöschsystem nach Anspruch 1, dadurch gekennzeichnet, daß die Ventilmittel zusätzlich stromaufwärts von dem Hauptventil (26) ein zweites Ventil in der Zulieferleitung (20) und eine Sollbruchscheibe (30) stromaufwärts von dem Hauptventil aufweisen, um einen Leckfluß des Feuerlöschmittels durch das normalerweise geschlossene Hauptventilfestzustellen, wobei die Sollbruchscheibe bei Austritt des Feuerlöschmediums durch die Zulieferleitung zerstört wird. 11. Verfahren zum Feuerlöschen, gekennzeichnet durch folgende Merkmale: a) Aufrechterhaltung eines Vorrats von flüssigem Feuerlöschmittel (12) in einem Tank (10) unter einem Druckkissen, bestehend aus Treiboder Druckmittel (14); b) Auslösen der Lieferung des Feuerlöschmittels durch eine Zulieferleitung (20) nach Feststellung einer Gefahr durch Öffnung eines normalerweise geschlossenen Ventiles (26) in der Zulieferleitung; c) Auslösung eines darauf folgenden Einsatzes einer Vielzahl von in Reihe betätigbaren Gruppen von Druck- oder Treibmittel enthaltenden Behältern (53 bis 57) in Verbindung mit dem Treib- oder Druckmittel in dem Tank, um dadurch zusätzliches Druck- oder Treibmittel zu dem Tank zu liefern und einen vorhergegebenen Druck in dem Tank aufrechtzuerhalten, damit das Feuerlöschmedium aus dem Tank zu der Gefahrenstelle schnell und vollständig entleert wird. 12. Verfahren nach Anspruch 11, gekennzeichnet durch den Schritt der Erhaltung des Druckoder Treibmittels in einer Gruppe der Behälter (53 bis 57), bis ein Druckabfall in einer vorgeschalteten Gruppe der Behälter auftritt. 13. Verfahren nach Anspruch 12, gekennzeichnet durch den Schritt der Übertragung eines Signals auf eine Steuerstation (34), wenn die letzte Gruppe der Behälter (53 bis 57) einen Druckabfall aufweist. 14. Verfahren nach einem der Ansprüche 11, 12 oder 13, dadurch gekennzeichnet, daß das Feuerlöschmittel ein flüssiger Halogenwasserstoff und das Druck- oder Treibmittel Stickstoff ist. 1. Un système d'extinction d'incendie comprenant: (a) un réservoir (10); (b) une substance (12) pour extinction d'incendie remplissant partiellement le réservoir suscite; (c) une matière propulsive (14) sous pression dans le reste du réservoir, cette matière déterminant un coussin de pression agissant sur la substance suscitée; (d) une conduite d'alimentation (20) associée au réservoir sus-cité pour le transport de la substance sus-citée du réservoir sus-cité à une zone de danger; (e) des organes du type valve dans la conduite d'alimentation sus-citée comprenant une valve principale (26) normalement fermée pouvant fonctionner pour délivrer la substance pour extinction d'incendie sus-citée au lieu du danger sus-cité; (f) une réserve de matière propulsive contenant des organes (53-57) qui communiquent par des conduites avec le coussin de pression sus-cité du réservoir sus-cité; caractérisé par (g) un organe d'actionnement (34), qui réagit pour faire fonctionner la valve principale sus-citée et qui, en conséquence, fait démarrer le fonctionnement séquentiel de la matière propulsive sus-citée, comprenant un organe pour délivrer de la matière propulsive supplémentaire au réservoir sus-cité pour y maintenir une pression prédéterminée pour l'évacuation rapide et complète de la substance sus-citée du réservoir sus-cité sur le lieu du danger sus-cité. 2. Un système d'extinction d'incendie comme défini par la revendication 1, dans lequel la substance sus-citée (12) est un hydrocarbure halogéné liquide. 3. Un système d'extinction d'incendie comme défini par la revendication 1 ou 2, dans lequel la matière propulsive sus-citée (14) est du nitrogène. 4. Un système d'extinction d'incendie comme défini par la revendication 1, dans lequel l'organe d'actionnement comprend un organe réagissant à un signal provenant d'une station de contrôle (34) associée au système sus-cité. 5. Un système d'extinction d'incendie comme défini par la revendication 4, dans lequel la réserve sus-citée consiste en une pluralité de groupes de cylindres (53-57) reliés en série, les groupes sus-cités pouvant fonctionner de manière successive, un organe (76) étant associé à chacun des groupes de cylindres sus-cités pour détecter une pression donnée et pour commuter à une groupe successif de cylindres. 6. Un système d'extinction d'incendie comme défini par la revendication 5, dans lequel l'organe détectant la pression (76D) du dernier groupe de cylindres transmet un signal à la station de

6 contrôle (34) mentionnée pour indiquer la fin des opérations d'alimentation en matière propulsive sus-citée. 7. Un système d'extinction d'incendie comme défini par la revendication 6 comprenant un organe de réglage de la temporisation (86) relié à l'organe de détection de la pression (76) pour assurer le fonctionnement de l'organe de détection de la pression sus-cité pendant une durée correspondant à l'évacuation totale mentionnée. 8. Un système d'extinction d'incendie comme défini par la revendication 4 dans lequel le signal sus-cité est pneumatique. 9. Un système d'extinction d'incendie comme défini par la revendication 1, dans lequel une extrémité (23) de la conduite d'alimentation (20) citée atteint le fond du réservoir sus-cité. 10. Un système d'extinction d'incendie comme défini par la revendication 1, dans lequel les organes du type valve sus-cités comprennent, en outre, une deuxième valve audessus de la valve principale (26) citée dans la conduite d'alimentation (20) citée et une plaque de rupture (30) à l'intérieur au-dessous de la valve principale sus-citée pour détecter les fuites de substance sus-citée par la valve principale qui est normalement fermée, la plaque sus-citée se rompant au moment de l'évacuation de la substance sus-citée par la conduite d'alimentation suscitée. 11. Un procédé d'extinction d'incendie comprenant les étapes suivantes: (a) maintien d'une réservie de substance liquide (12) pour extinction d'incendie dans un réservoir (10) sous un coussin de pression de matière propulsive (14); (b) mise en marche de l'alimentation en substance citée par une conduite d'alimentation (20) dès détection d'un danger en ouvrant une valve (26) normalement fermée dans la conduite d'alimentation; (c) mise en marche du fonctionnement séquentiel d'une pluralité de groupes de réservoirs (53-57) de matière propulsive, pouvant fonctionner en série, qui communiquent par des conduites avec la matière propulsive sus-citée dans le réservoir sus-cité pour délivrer de la matière propulsive supplémentaire au réservoir mentionné pour maintenir une pression donnée dans le réservoir sus-cité pour l'évacuation rapide et complète de substance citée du réservoir mentionné au danger mentionné. 12. Un procédé comme défini par la revendication 11 comprenant l'étape du maintien de la matière propulsive mentionnée dans un groupe de réservoirs (53-57) jusqu'à ce qu'une baisse de pression soit atteinte dans un groupe de réservoirs qui précédent. 13. Un procédé comme défini par la revendication 12 comprenant l'étape de la transmission d'un signal à une station de contrôle (34), lorsque le dernier groupe de réservoirs (53-57) a atteint la baisse de pression mentionnée. 14. Un procédé comme defini par la revendication 11, 12 ou 13, dans lequel la substance mentionnée est un hydrocarbure halogéné liquide et la matière propulsive mentionnée du nitrogène.

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