MXPA97000437A - Fog fire suppression device from a - Google Patents

Abstract

A fire suppression device that includes an enclosure having opposite end walls and a side wall that joins the end walls to define a hollow chamber within the enclosure. A spray nozzle is operably coupled with a first end wall and has an inlet portion adjacent to the chamber and an outlet in communication with the atmosphere outside the enclosure. A frangible barrier is interposed between the inlet portion of the nozzle and the chamber and responds to a predetermined fracture pressure in order to allow communication between the nozzle and the chamber. A piston is placed between the end walls and engages around an inner periphery of the side wall so as to divide the chamber into two sections. A first of these sections, between the piston and the first end wall is filled with a quantity of water and comprises a major fractional portion of the volume of the chamber. The piston is slidably movable relative to the side wall in the direction of the first end wall, in response to a force exerted on the piston to exert pressure on the amount of water in order to initially fracture the frangible barrier and then supply a mist of water through the spray nozzle. A gas generator communicates with the second section to supply high pressure gas in order to exert force on the piston, causing a fine mist to flow from the nozzle. As a variation, a conduit may extend from the nozzle to the second section, and the nozzle may include venturi tubes that extend between the first section and the conduit. The generated gas will flow through the duct to attract additional water through a ventu effect.

Description

"WATER MIST FIRE SUPPRESSION DEVICE" BACKGROUND OF THE INVENTION This invention is directed to a novel and improved fire suppression device and, more particularly, to a device that produces a water mist and is integral. Still more specifically, the fire suppression device can use an inert gas generating apparatus to facilitate the formation and / or propulsion of a water mist. So far, the suppression of water-based indoor fire has generally been in the form of water spraying systems that usually operate at the pressure of the regular building or municipal water. These systems depend on the distribution of a plurality of spraying heads around an area to be protected. These systems can be relatively complicated and expensive, requiring pipes that interconnect the spraying heads and run to an appropriate water source that is normally at the pressure provided in the facility or building, or the municipal water pressure or other supplier, is say, a relatively low pressure. These spraying systems when activated provide large amounts of water at relatively low pressures. However, in many applications, the distribution of a relatively large amount of water in case of fire is considered undesirable. This may be due to the sensitivity of the different types of equipment to the large amounts of water and / or the high probability of damage to this equipment in response to a relatively large amount of water to be applied by this spraying system in case of fire. This equipment can be found, for example, in computer rooms, turbine rooms, bank vaults and the like. Many industrial processes use equipment maintained at high temperatures that could be damaged by rapid cooling due to the application of a large amount of water. In these latter types of applications, a certain non-water based fire protection system such as fire extinguishers based on chemical substances (frequent halon) that must be used by personnel in case of fire, or less commonly, is used. Another distribution system where a chemical fire suppressant such as halon is applied. However, halon is no longer manufactured due to its high ozone depletion potential.

One technology that has emerged more recently in fire protection is to use some form of water mist system. These systems use relatively small amounts of water in the form of a fine mist to extinguish a fire instead of a relatively large volume of water that a regular spraying system will typically distribute or apply. A water mist works to extinguish a fire by at least two different mechanisms, namely, extracting the heat and displacing the oxygen. These systems use relatively small amounts of water in the form of a fine mist of relatively small water droplets, (e.g., 50 microns) to extinguish fires. As mentioned, this water mist can extinguish a fire using several different mechanisms. First, the rapid evaporation of the small water droplets extracts the heat and second the oxygen moves due to the displacement by air vapor as the droplets of water turn into vapor. Also, the amount of heat that is radiated from a flame to unburned fuel is decreased. These water mist systems are useful in areas where large volumes of water are not available or where large amounts of water would cause undesirable damage to equipment, for example, computer rooms, bank vaults, turbine rooms, etc. as mentioned above. Instead of using regular nozzles and available pressurized water, these water mist systems usually use atomization nozzles that require a relatively high pressure water supply to produce the desired mist. These water mist systems can therefore be similar to conventional spraying systems as they may require an extensive pipe to provide water to the nozzles. further, these systems, unlike conventional spraying systems, require pumps and high pressure connections, fittings, conduits and the like to maintain the required water pressure. Therefore, these systems can be relatively complicated and difficult and expensive to install, maintain and, modify, if desired. For example, modifying this system to protect a different equipment in different locations, add locations or the like, can be relatively complicated, expensive and time-delayed.

OBJECTS AND COMPENDIUM OF THE INVENTION Accordingly, a general object of the invention is to provide a novel and improved water mist fire suppression device that does not require a separate high pressure water source placed remotely, or a pipeline system, pumps or similar interconnected articles. . A related object is to provide a fire suppression device in accordance with the aforementioned object that can be placed relatively easily or moved to an appropriate location to service an area where fire protection is desired. Still another object is to provide a fire suppression device in accordance with the aforementioned object which is integral and can be provided in various sizes and configurations for use in different applications. By abbreviating, and in accordance with the aforementioned objects, a fire suppression device comprises an enclosure having opposite end walls and a side wall joining the end walls to define a hollow chamber within the enclosure; an atomization nozzle operably coupled to a first end wall and having an inlet portion adjacent to the chamber and an outlet portion in communication with the atmosphere outside the room; a frangible barrier interposed between the nozzle inlet and the chamber and responding to a predetermined fracture pressure in order to allow communication between the nozzle and the chamber; a piston means positioned between the end walls and coupled around an inner periphery of the side wall to divide the chamber into two parts comprising a first section between the piston means and the first end wall to be filled with an amount of water and a second section between the piston means and the other end wall, the first section comprises a main fractional portion of the volume of the chamber; the piston being slightly movable relative to the side wall in the direction of the first end wall in response to a force exerted on the piston means to exert pressure on the amount of water in order to initially fracture the frangible barrier and then supply a water mist through the atomization nozzle and a driving means for exerting force on the piston means.

BRIEF DESCRIPTION OF THE DRAWINGS The particular features or characteristics of the present invention that are believed to be novel are pointed out with particularity in the appended claims. The organization and manner of operation of the invention, together with the objects and additional advantages thereof may be better understood by reference to the following description taken in conjunction with the accompanying drawings in which the like reference numbers identify like elements and wherein: Figure 1 is a sectional elevation of a fire suppression device according to the invention; Figure 2 is a section elevation showing a second embodiment of a fire suppression device according to the invention; Figure 3 is a sectional elevation showing an alternative form of an inert gas generating device that can be used in the fire suppression device of the invention; and Figure 4 shows still another form of inert gas generating device that can be used in the invention.

DETAILED DESCRIPTION OF THE ILLUSTRATED MODALITY Referring now to the drawings and initially to Figure 1, a fire suppression device according to the invention is generally designated by the reference numeral 10. The device 10 includes an enclosure 12 having opposite end walls 14, 16 and a side wall 18 joining the end walls together to define a hollow chamber 20 within the enclosure. The walls 1416, can generally be of circular configuration and the side wall 18 can be cylindrical and formed continuously with and between the respective end walls 14, 16. However, other shapes, configurations and means can be used to join the respective walls together to form the chamber 20, without deviating from the invention. Attached to the end wall 14 is an atomization nozzle 22 having an inlet portion 24 adjacent to the chamber 20, and an opposite exit portion 25 or in communication with the atmosphere to the outside of the enclosure 12. A frangible barrier such as a thin rupture sheet 26 is interposed between the inlet portion 24 of the nozzle and the chamber 20. Preferably, the thin rupture sheet is above the inlet portion 24 of the nozzle where it meets or intersects with the inner surface of the end wall 14. This frangible barrier or thin rupture sheet 26 responds to a predetermined force or pressure exerted therein to fracture it and thereby allow communication between the nozzle 22 and the chamber 20.

The chamber 20 is divided into an upper or first section 28 and a second or lower section 30 by a piston 32 that is positioned at a predetermined distance between the respective end walls 14, 16 and engages around an inner periphery of the wall 18 lateral. Preferably, this coupling is such that water can not pass around the edges of the piston 32. The piston 32 is slidably movable relative to the side wall 18 and is movable generally in the direction toward the wall 14 of end in response to a pressure exerted on the piston on its side opposite the wall 14. Therefore, the piston 32 effectively divides the chamber in the first section 28 positioned between the piston 32 and the end wall 14 and the second section 30 positioned between the piston 32 and the end wall 16. In its initial condition and before any movement of the piston 32 relative to the respective end walls 14, 16, the first section 28 of the chamber 20 comprises a main fractional part of the chamber, i.e. it is of much greater volume than the second section 30, as defined by the piston 32. The first section 28 of the chamber 20 is filled with a certain amount of water. Therefore, when the piston 32 is forced upward in the direction of the end wall 14, the water in the first section 28 will exert a pressure on the slender blade 26 causing the shatter blade to break and the Water flows through the spray nozzle 22 to create a water mist. Referring now to the second section , an impeller 40 is positioned or mounted on or at least in communication with the second section 30 of the chamber 20. This impeller produces the force or pressure necessary to drive the piston toward the end wall 14. Preferably, the impeller 40 comprises a gas generator. This gas generator is capable of operating to generate a certain amount of gas, and preferably of an inert gas, upon the occurrence of the preselected external stimuli and to release this amount of gas to the second section 30 to exert a pressure on the piston 32. in order to cause the release of a water mist in the spray nozzle 22 as just described. This external stimulus may take the form of an appropriate electrical signal produced by a selected sensor such as a heating sensor, smoke detector or the like, which is not part of the invention and is not illustrated herein. The shape of the sensor or transducer used to activate the gas generator can take any suitable form without deviating from the invention.

Figure 2 illustrates a somewhat modified embodiment of the fire suppression device, which is generally designated by the reference numeral 210. In many respects, the device 210 is similar to the device 10 illustrated and described above with reference to the Figure 1. Therefore, like reference numbers will be used to designate like parts and components of the fire suppression device 210. Similar to the modality of the Figure 1, the fire suppression device 210 has an enclosure 212 formed in a first wall 214, a second wall 216 and a side wall 218 defining a chamber 220. A spray nozzle 222 has an inlet 224 and an outlet 225. Reversing of the embodiment of Figure 1, the atomization nozzle 222 is illustrated here as an auxiliary air atomization nozzle. The chamber 220 is divided into a first section 228 and a second section 230 by a piston 232 slidably mounted. Deviating from the embodiment of Figure 1, the auxiliary air atomizing nozzle utilizes an elongated tubular conduit 250 extending between the nozzle 222 at a first end 251 and a second section 230 of the chamber, and a second end 253 for supplying a portion of the gas generated by a gas generator 240 to the nozzle 222 to drive water therethrough. In this regard, the nozzle 222 includes a plurality of diagonally inclined or venturis passages 252, 253, each having an end forming the nozzle inlet 224 adjacent to the first section 228 of the chamber, and an opposite end intersecting the inside the tubular conduit 250, just below the outlet 225 which generally coincides with the end 251 of the tubular conduit 250. A frangible barrier or thin blade 226 that operates in the same manner as the thin rupture sheet 26 is interposed between the inlet 224 toward the venturis 252, 254 and the portion 228 of the chamber. In this embodiment, the thin metal sheet 226 of rupture is generally a flat annular member that surrounds the tubular conduit 250 in order to be initially above the inlet 224 of each of the plurality of venturis tubes 252, 254. It will be understood that while two of these venturi tubes are illustrated herein, only a single venturi tube or more than two of these venturi tubes may be provided without departing from the invention. Similarly, the thin metal foil 226 may be provided in a different configuration or as a plurality of individual members one for each inlet 224 without deviating from the invention. In the illustrated embodiment it will be seen that the inner diameter of the tubular conduit 250 becomes narrower in its upper portion just before the point of intersection with the passages 252, 254. Also, to accommodate the tubular conduit 250, the piston 232 is provided. with a central through opening that is placed with a folded rear edge similar to its folded rear outer edges as also shown in Figure 1. These folded back edges allow the piston to sliply engage and maintain a water seal against both the outer wall of tubular conduit 250 as with the inner surface of side wall 218. This facilitates the sliding movement of the piston 232 in the direction of the first wall 214 in response to the pressure exerted therein by the release of gas from the gas generator 240. Turning now to the gas generator 240, as mentioned above, it preferably comprises an inflator device of the type generally used for a restriction device of the inflatable vehicle occupant or airbag. Generally speaking, this inflator 240 includes a housing 242 which generally has a generally circular bottom wall 244 and a generally circular upper wall 246 and a generally cylindrical outer peripheral wall 248 extending between and operatively connecting the walls 246 and 244 upper and lower to form a housing. Radially inwardly separating the outer peripheral wall 248 is a generally cylindrical internal wall 256 that extends between and joins the upper wall 246 and the lower wall 244. Typically, the upper wall 246, the outer wall 248 and the internal wall 256 are formed as a unit and are joined to the lower wall 244 by a process such as inertial welding. In this regard it will be seen that the lower wall 244 has a pair of generally annular short concentric upwardly extending surfaces or rings that are respectively aligned with and engage the outer wall 248 and the internal wall 256. The walls 248 and 256 define a pair of chambers including a cylindrical firing chamber 258 within the portion 256, with the chamber 258 being partially filled with ignition material 260, and also accommodating an initiator or detonator 262. Radially surrounding the wall 256 and within the outer wall 248, there is a generally annular generating chamber 264 that houses a quantity of pyrotechnic gas generating material 268. This material may have different compositions such as an azide, and may be in many forms, a wafer form is illustrated herein for purposes of description. The internal wall 256 includes a plurality of ignition holes 270 that extend between the chambers 258, 264 of ignition and generator to allow hot gases from the ignition material 260 to flow into the generating chamber 264 and cause the generator material 268 to generate a certain amount of gas. Similarly, the external wall 248 is provided with a plurality of gas outlet orifices 272 through which the gas generated from the gas generator 240 exits towards the second section 230 to thereby exert a pressure on the piston and pushing the piston in the direction of the first wall 214. Intermediate to the gas generator material 268 and the internal surface of the external pred 248 in which the outlet orifices 272 are placed, a filter structure is interposed which is generally designated by the reference number 274 for filtering and cooling the gas generated before its exit through the orifices 272. The filter is tubular or generally cylindrical in shape. Without deviating from the invention, gas generating structures of different configuration can of course be used. For example, a structure in which the outlet holes 272 are provided in the upper wall 246, and wherein the structure of the filter or assembly is a generally annular disc-shaped member interposed between the gas generating material 268 and the surface of the upper wall 246, it can be used of course. During operation, the initiator 262 responds to an externally generated electrical signal to produce a burst or amount of energy that causes the ignition material 260 to ignite rapidly. This will cause the hot gases to flow through the orifices 270 into the generating chamber 264 thereby causing the generating material 268 to rapidly generate a certain amount of gas, preferably an inert gas that will exit the orifices 272 toward the second section 230. of the chamber 220, to drive the piston 232 as described above. It will be seen that the gas generator 240 is coupled to the enclosure 212 by means of an outwardly projecting mounting flange 280, which extends generally radially outwardly of the gas generator 240. In the illustrated embodiment, this mounting flange 280 is formed as an extension of the bottom wall 244 of the gas generator 240 and has a number of through openings to accept fasteners 282 suitable for coupling thereto to the external surface of the enclosure 212 in its interior. second wall 216. In this regard, second wall 216 can also be provided with aligned openings that can be threaded to match fasteners 282 to achieve this interconnection. Cooperatively, the second wall 216 may be provided with a generally centered enlarged opening 284 for receiving the external wall 248 of the gas generator 240 therethrough so that the outlet orifices 272 communicate with the second section 230. of the chamber 220, and in such a way that the mounting flange 280 abuts and is aligned with an external surface of the second wall 216 of the enclosure 212. An appropriate sealing means such as an annular O-ring 286 can also be interposed between the lower wall 244 and the second wall 216. The lower wall 244 will be seen to be formed with a generally cylindrical upwardly extending skirt portion ending at the radially outwardly extending flange portion which also provides a surface to accommodate the O-ring 286. Referring now to the remaining drawings, two additional forms of gas generators could be used instead of the gas generator 240 described above without deviating from the invention. Of course, any suitable form of gas generator or device similar to a gas generator that produces a quantity of gas or other fluid under pressure to drive the piston 232 in the manner described above, it could be used without deviating from the invention. Figure 3 illustrates a gas generator ignition assembly using a projectile of the type illustrated and described in U.S. Patent No. 5,230,531 which is incorporated herein by reference to the related degree. In this way, the structure and operation of the gas generator of Figure 3 will not be described in detail herein. Abbreviating, however, the gas generator of Figure 3, which is generally designated by the reference numeral 300, uses a container 310 in the form of a tubular bottle, a tank cylinder of the type that is frequently used to store pressurized gas . An end portion of the container 310 is provided with an accessory 320 in which a plurality of gas outlet orifices 330 are formed. Appropriate means can be used to ensure communication of these gas outlet holes 330 in the second section 30 or the second section 230 of the chamber 20 or 220 of the embodiment of either Figure 1 or Figure 2, as described in the foregoing. Referring to the inflator device 300, a quantity of pressurized gas is contained within the package 310. An isolation disk 332 prevents the gas in the package 310 from reaching the outlet orifices 330.

During operation, an appropriate sensor or detector device (not shown) will detect a condition that requires operation of the fire suppression device and transmits a corresponding signal to an activation set 334. The activation assembly 334 includes an electro-explosive device having a projectile 336. When activated by the appropriate signal, the electro-explosive device propels the projectile 336 towards the disk 332 to penetrate and separate the disk in order to allow the gas begins to flow from the container 310 through the exit holes 330. A gas generator assembly 340 using a gas generator material 342, for example, similar to the generator material 268 described above with reference to Figure 2, is also generally housed coaxially within the container 310. This generator set gas is provided to increase the flow of gas from the container 310 through the outlet orifices 330. In addition, the heat produced by the combustion of the generating material will serve to raise the temperature, and therefore the pressure of the stored gas. The gas generator assembly is activated by a change in pressure that is detected by a bi-stable diaphragm 343, which is mounted in a reference chamber 344 that contains a quantity of gas at a predetermined pressure. As the gas flows from the container 310, the pressure experienced in the diaphragm on its surface opposite to the reference chamber 344 decreases, since this surface remains in contact through the holes 346, with the gas leaving the chamber 344. container 310. Consequently, a central portion of the diaphragm is generally driven in the direction of the gas generator assembly 340, also urging and striking against a pin 348 in this direction. The pin 348 collides in engagement with a percussion primer 350 to ignite the generator material 342. The gases generated by the generator material 342 then exit their gas generator assembly 340 through a series of outlet holes 352 formed in the end surfaces thereof, to increase the flow of gas from the container 310. now referring to Figure 4, still another type of gas generator is illustrated and is designated generally by the reference number 400. Similar to the gas generator 300 of Figure 3, the gas generator 400 includes a tubular container 410 which contains a quantity of pressurized gas, and preferably an inert gas. The package 410 has an outlet fitting 412 having a plurality of internal holes 414 communicating with the interior of the package and a plurality of external holes 416 communicating with the external atmosphere. As with the inflator of Figure 3, any suitable means can be used to form an operating interconnection for the gases flowing from the orifices 416 to the second section 30 or second section 230 of the fire suppression device in order to drive the piston 32 or 232. Likewise similar to the embodiment of Figure 3, a frangible barrier 420 is interposed between the internal holes 414 and the external holes 416. This barrier 420 responds to an increase in predetermined pressure exerted therein from within the container 410 for bursting to permit communication between the respective holes 414, 416 and the consequent gas flow outwardly from the orifices 416. A compartment 424 it is also defined within the container 410 by a partial-wall structure 426 having a central opening 428 that is closed by a frangible barrier 430. The compartment 424 contains an amount of one or more fluid fuels and one or more oxidants to form a volatile mixture. When an appropriate signal occurs from the appropriate external sensor or other transducer (not shown), an electrical signal of appropriate activation is fed to an initiator 432 which extends into the compartment 424. This initiator 432 may be similar to the initiator 262 illustrated and described above with reference to Figure 2. The initiator 432 when activated from this This produces a burst of energy that will ignite the volatile mixture in the compartment 424 by in turn bursting the barrier 430 and expelling the additional pressurized gas towards a portion 415 of gas storage, defined within the container 410 and outside the structure 426 of wall. The elevation in consequent pressure, in turn will cause the fracture of the barrier 420 to cause the pressurized gas, increased by the gas flow from the volatile mixture in the chamber 424, to flow outwardly through the external orifices 416. A gas generator supplied with appropriate fluid fuel that could be used as the gas generator 400 is illustrated more fully and is described in copending US Patent Application Serial No. 08 / 252,036 filed May 31, 1994 under the number of the touch of the 2525-21-00 dealership attorney who is incorporated herein by reference to the extent to which he describes this device.

What has been illustrated and described herein is a novel and improved integral water mist suppression device. Preferably, the device is driven by a gas generator or a gas generator-type device even when they could be used within the scope of the invention as defined by the claims of the present, other means for driving or energizing the device. suppression of fire. Even though the specific embodiments of the invention have been shown and described in detail, it will be apparent to those skilled in the art that changes and modifications of the present invention can be made in its various aspects without departing from the invention in its broadest aspect, to the way of whose changes and modifications being matters of engineering or routine design and others being evident only after a study. As such, the scope of the invention should not be limited by the specific embodiments and specific constructions described herein but should be defined by the appended claims and the equivalents thereof. Accordingly, the aim of the appended claims is to cover all those changes and modifications that fall within the true spirit and scope of the invention.

Claims (8)

R E I V I N D I C A C I O N E S:

1. A fire suppression device comprising: an enclosure having separate opposite end walls and a side wall joining the end walls to define a hollow chamber within the enclosure; an atomization nozzle operably coupled to a first end wall and having an inlet portion adjacent to the chamber and an outlet in communication with the atmosphere outside the room; a thin metal break paper interposed between the inlet portion of the nozzle and the chamber and responding to a predetermined fracture pressure to allow communication between the nozzle inlet portion and the chamber; a piston positioned between the end walls and coupled around an inner periphery of the side wall to divide the chamber into a first section between the piston and the first end wall and a second section between the piston and the second end wall, the first section is filled with a quantity of water and comprises a major fractional portion of the volume of the chamber, the piston is slidably movable relative to the side wall in a direction towards the first end wall in response exerted therein to exercise pressure in the amount of water in order to initially fracture the frangible barrier and subsequently supply a mist of water through the atomization nozzle; and a gas generator communicating with the second section to raise the pressure within the second section and thus exert the force on the piston. A fire suppression device according to claim 1 and further including a tubular conduit extending between the atomization nozzle in the second section of the chamber to supply a portion of a gas generated by the gas generator to the nozzle to push water through the nozzle. A fire suppression device according to claim 2, wherein the tubular conduit comprises an elongated member having a first end consisting of an outlet of the nozzle and a second end consisting of an inlet extending to the second section of the chamber, and wherein the atomization nozzle includes at least one venturi tube having one end intersecting the tubular conduit adjacent the first end, and another end comprising the inlet portion of the nozzle and wherein The thin metal sheet of break is interposed between the first section of the chamber and the inlet portion of the nozzle. A fire suppression device according to claim 1, wherein the gas generator includes an amount of gas generating material that responds to a predetermined burst of energy in order to rapidly generate a quantity of gas and an initiator that it responds to a predetermined external stimulus to produce the predetermined burst of energy in the housing. A fire suppression device according to claim 1, wherein the gas generator comprises a housing having an exit orifice in communication with the second section of the chamber and a gas generating means in the housing for generating a quantity of gas in response to a predetermined stimulus. A fire suppression device according to claim 5, wherein the gas generator further includes an amount of gas pressurized in the housing, an insulating disk interposed between the quantity of the pressurized gas and the outlet orifice and responding at a predetermined force for fracturing in order to allow communication therebetween, and an initiator in the housing responding to a predetermined electrical impulse to exert the predetermined force on the insulating disk to release the amount of inert gas from the housing towards the camera. 7. A fire suppression device according to claim 6, and that further includes a gas generating assembly within the housing, the amount of the gas generating material is restricted in the assembly and responds to a predetermined stimulus to produce an inert gas quantity, a primer in the assembly to produce the predetermined stimulus. in response to a change in pressure as the gas is released from the housing, thereby supplementing the amount of gas released from the housing with an amount of gas generated by the gas generator and heating the pressurized gas. A fire suppression device according to claim 1, wherein the gas generator includes a housing having an external orifice in communication with the second section of the chamber, a compartment containing a quantity of fluid fuel material and an amount of oxidizing material, whose fluid and oxidant fuel when ignited will produce an amount of inert gas, and a gas storage portion containing an amount of pressurized gas; a barrier interposed between the gas storage portion and the external orifice and responding to a predetermined first pressure to fracture in order to allow gas from the gas storage portion to exit the external orifice, a barrier interposed between the compartment and the gas storage portion and responding to a second predetermined pressure to fracture in order to allow mixing of the gas generated by the fluid fuel material and the oxidizing material with the pressurized gas in order to produce the predetermined first pressure to fracture the barrier between the compartment and the portion mentioned, and an initiator responding to a predetermined electrical impulse to ignite the fluid fuel and the oxidant in order to produce the second predetermined pressure thereby producing the first predetermined pressure to fracture the barrier between the portion and the outer hole. SUMMARY OF THE INVENTION A fire suppression device that includes an enclosure having opposite end walls and a side wall that joins the end walls to define a hollow chamber within the enclosure. A spray nozzle is operably coupled to a first end wall and has an inlet portion adjacent to the chamber and an outlet in communication with the atmosphere to the outside of the enclosure. A frangible barrier is interposed between the inlet portion of the nozzle and the chamber and responds to a predetermined fracture pressure in order to allow communication between the nozzle and the chamber. A piston is placed between the end walls and engages around an inner periphery of the side wall so as to divide the chamber into two sections. A first of these sections, between the piston and the first end wall is filled with a quantity of water and comprises a major fractional portion of the volume of the chamber. The piston is slidably movable relative to the side wall in the direction of the first end wall, in response to a force exerted on the piston to exert pressure on the amount of water in order to initially fracture the frangible barrier and then supply a mist of water through the spray nozzle. A gas generator communicates with the second section to supply high pressure gas in order to exert force on the piston, causing a fine mist to flow from the nozzle. As a variation, a conduit may extend from the nozzle to the second section, and the nozzle may include venturi tubes that extend between the first section and the conduit. The generated gas will flow through the conduit to further attract the water through a venturi effect.