Classifications

• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62C—FIRE-FIGHTING
  • A62C13/00—Portable extinguishers which are permanently pressurised or pressurised immediately before use
  • A62C13/62—Portable extinguishers which are permanently pressurised or pressurised immediately before use with a single permanently pressurised container
  • A62C13/64—Portable extinguishers which are permanently pressurised or pressurised immediately before use with a single permanently pressurised container the extinguishing material being released by means of a valve
• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62C—FIRE-FIGHTING
  • A62C99/00—Subject matter not provided for in other groups of this subclass
  • A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
  • A62C99/0018—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using gases or vapours that do not support combustion, e.g. steam, carbon dioxide

Definitions

• the proposed invention relates to an improved fire extinguisher. More particularly, it relates to an improved fire extinguisher which can be used to extinguish all kinds of fire without affecting the properties or damaging the material involved in the fire as well as to alleviate the problems related to the existing fire extinguisher assemblies.
• Fire incidents can happen in many ways depending on the cause of fire outbreak, but broadly there are two types of fires, one is natural and other is manmade. Forest fires can be either due to natural or manmade reasons. All residential and non-residential structural fires are largely incidentally or by errors or due to lack of awareness. Similarly, all industrial and chemical fires are due to explosions or fires made by human errors or due to machine failures. Whether natural or erroneous, fire takes place in presence of fire catching material and flammable substances like fuel, flammable gases and alike. The fire continues to spread until the heat transfer and oxygen supply is ceased.
• Fires which are considered as natural are basically earthquake, volcanic eruption and lightning - generated fires.
• the fire and explosion risk associated with an earthquake is very complex. Compared with ordinary fires, the fire and explosion hazard related to earthquakes can constitute substantial and heavy risk. Damage to natural gas systems during an earthquake is a major cause of large fires.
• Fire caused by human/machine errors are considered as manmade fires, e.g. industrial or chemical fire, disasters, fires at social gatherings due to Electrical short circuit fires, accidental fire and kitchen-fires.
• Municipal and urban residential and non-residential structural fires are also largely manmade fires. Any confined fire could be due to many reasons like, cooking fire confined to container, chimney or fuel fire confined to chimney, incinerator overload or malfunction, fuel burner/boiler malfunction, and trash fire.
• a fire extinguisher or extinguisher, flame extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations by discharging out the extinguishant from the extinguisher where an extinguishant is an agent which extinguishes the fire.
• a fire extinguisher consists of a hand-held cylindrical pressure vessel containing an agent which can be discharged to extinguish a fire.
• each of the extinguishers has different extinguisher assembly and respective extinguishant filled in it. They are characterized as below: 1) Water type Extinguisher:
• extinguishers can only be used to extinguish fire mainly of solid material like wood, paper and cloth etc.
• Water acts as a coolant eliminating heat which breaks the chain reaction of fire that is air, heat and fuel. Since heat is eliminated using water fire cannot be continued.
• the foam extinguisher cannot be used for electrical equipment because the foam contains water. Since water is conductor of electricity, it is dangerous to the operators of such extinguisher. Further, it cannot be used on flammable gases because flammable gases are lighter in weight compared to foam, so the flammable gases escape out and hence fire cannot be extinguished properly.
• This type of extinguisher can be used to extinguish fire associated with solid, flammable gases, flammable liquid and electrical equipment.
• DCP molecules particles have tendency to expand when they get exposed to temperature. All DCP molecules together make a cloud on the burning object and cut off the Oxygen supply. Since DCP is solid substance, they also rest on solid substance which are burning and control fire by physically covering the burning object. At the same time since these particles are having tendency to expand they become light in weight and hence also capable to control flammable gases and flammable liquid fire. Further, DCP is having no electrical conductivity if they do not contain moisture, hence they can also be used to extinguish electrical fire.
• DCP being solid substance in form of powder, get mixed or dissolved with the cooking oil and fats and contaminates it when used to extinguish fire associated to it, hence they cannot be used to extinguish the cooking oil and fats fire.
• dry powder being solid substance it requires cleaning after the use of such extinguishers.
• being a solid powder many times it is difficult to propel out through deep tube, spring, plunger, valve and discharge nozzle assembled at 90°.
• the deep tube is in vertical position and discharge nozzle is at 90°.
• DCP being a solid substance to travel at 90°.
• the nozzle diameter is much less than the deep tube diameter.
• DCP is also s bject to contamination as it losses the property due to the limited shelf life in a due course of time.
• discharging dry chemical powder invites visibility problem and injury to the person on whom it is discharged directly by mistake.
• Carbon dioxide fire extinguisher can be used for extinguishing fires on flammable liquids, electrical equipments and cooking Oils and fats. Being light in weight, carbon dioxide is capable to float temporarily on flammable liquid fire and on cooking oil and fats cutting the oxygen supply to extinguish the fire. Further, C02 ' is non-conductor of electricity and hence it can be used to extinguish electrical fire also.
• Carbon dioxide being in a gaseous form requires high pressure of around 35 kg/ cm 2 to get converted into liquid to store it into cylinder. Therefore, the cylinder valve thickness is very high to withstand the pressure for even 5kg capacity of CO2 gas.
• the total weight of extinguisher would be around 18 kg which is difficult to lift for everyone and to run the spot of fire.
• CO2 on discharge gets mixed into the atmosphere hence it is not effective for solid fires. It is neither able to cool nor able to provide blanket of C0 2 failing to help to control solid fire. The same applies with flammable gasses. Further, C0 2 being a gas is not effectively able to cover the flammable gases to cut off the oxygen supply and hence fail to extinguish such fires.
• CO2 Another practical problem of CO2 is that though it itself is not a conductor of electricity, but when it get discharged from high pressure to low pressure it generates cooling effect and condenses the atmospheric moisture on the discharge pipe which conducts the electricity. This results in high risks of cold burns to the operator. In addition, an annoying and fearing sound is generated by this type of extinguisher that may scare the operator to use the same. Additionally, the valve assembly does not withstand the pressure with which CO2 is stored in the extinguisher and may lead to leakage. This may further lead to failure of the extinguisher to serve the purpose when actually required.
• Cartridge-operated extinguishers contain the expellant gas in a separate cartridge that is punctured prior to discharge, exposing the propellant to the extinguishing agent. They have the advantage of simple and prompt recharge, allowing an operator to discharge the extinguisher, recharge it, and return to the fire in a reasonable amount of time. Unlike stored pressure types, these extinguishers use compressed carbon dioxide instead of nitrogen. Cartridge operated extinguishers are available in dry chemical and dry powder types and in water, wetting agent, foam, dry chemical powder. As mentioned earlier, the conventional extinguishers are generally made up of Mild Steel and therefore they, are subject to face corrosion problem resulting into the reduced metal thickness of extinguisher shell, cylinder or a container in a due course of time.
• the conventional type extinguishers have two levers, one for holding the extinguisher and other to press and discharge the content of the extinguisher.
• the said levers are generally made of Mild Steel metal sheet due to which they get corroded completely and ' either losses strength or are found broken.
• the safety lock pin is used to prevent tempering and malfunctioning of the valve for the safety reason where the conventional fire extinguishers use plastic, mild steel or galvanized metals for the said safety lock pins which get jammed because of corrosion and become impossible to disengage at the time of use, failing to serve the purpose of extinguishing the fire.
• the conventional type extinguishers have external installation bracket which are usually made out of Metal and M.S. fitting like screws or nails. Such external installation brackets are most of the times found under heavy corrosion. Once corroded, they are no more in a position to withstand the extinguisher weight and hence the extinguisher has high risks of falling down leading to leakage or if the bracket gets broken, it is not placed on the required place or missing from the proper place of installation.
• cartridge is used to generate the required pressure in the extinguisher to push out the extinguishant. The conventional technology using cartridge has reported fatal accidents because, of explosion of the main cylinder of the extinguisher.
• the conventional extinguisher having cartridge design needs to be punchered to generate required pressure.
• the operator has to strike his hand on the valve plunger. Many times it happens that since the plunger pin gets jammed in spite of repeated attempt of punchering the disc of cartridge, the operator fails to do so and hence lead to hand injury.
• valve design is such that the extinguishant either it is water, foam or dry chemical powder passes through the spring due to which they get struck with the spring and create obstacle to perform spring operation and also helps to accelerate the corrosion process because of water or foam type extinguishant.
• Another reason for the leakage is that the coil spring which is normally under pressure gets jammed because of having constant pressure and develops metal fatigue or it loses its strength over a period of time because of corrosion. This design is not reliable in terms of maintaining pressure; it is subject to leak over a period of time.
• the conventional type extinguishers have plastic deep tube having chamfered cut at the bottom at around 45° which leaves behind unused extinguisharit up to 10% of the total quantity after complete discharge which is having direct effect on the efficiency of extinguishing the fire. Moreover, because of plastic material there are chances of siphon tube getting bend, crack or can even break resulting into the pressure leakage and failure of the extinguisher.
• the conventional fire extinguishers have bottom ring of plastic or M.S. or other metal. In such extinguishers the welding of bottom ring gets open and the extinguisher gets leaked on falling.
• the conventional type extinguishers have single hole plastic nozzle within built cap which results in a jet type discharge of the extinguishing agent resulting in splashing of fire. Because of the single hole nozzle and the cap design, the quantity and the spray pattern of the extinguishant is not capable to cover the fire instantaneously thus it fails to- control the fire. Further, with a single hole the quantity which is coming out is getting burned into the fire or decomposes and losses the extinguishing capacity resulting into failure of extinguishing the fire. Thus, such conventional type extinguishers are not reliable as due to the single hole plastic nozzle they take longer time to extinguish the fire and fail to prevent the spreading of fire.
• the conventional type extinguishers have plastic or rubber discharge pipe.
• Such conventional type discharge pipe has limited efficiency and life to withstand climatic conditions such as sunlight, rain water, cold and hot air, air pollution like petroleum, solvent or chemical fumes. Hence, such conventional type discharge pipes are often found cracked and broken.
• plastic and rubber have poor mechanical strength.
• the conventional type extinguishers use readymade pressure gauge available in the market. Many times they are not calibrated in reference to the type of extinguishant used in the extinguisher, thus technically they do not indicate the right designed pressure. Hence, they are responsible for the pressure related problems associated with the working of the extinguisher such as splashing of the material on fire, leakage, metal fatigue and other problems related to valve operation.
• the conventional type extinguishers is having discharge nozzle assembled at 90° in the main valve body.
• the extinguishant while traveling vertically from container to deep tube to spring to plunger further to main valve body and immediately it needs to travel 90° from the nozzle, reducing the speed and pressure ultimately losing the extinguishing efficiency by getting jammed.
• the safety lock pin is made of plastic or Mild Steel which breaks off easily due to corrosion or is difficult to disengage leading to failure of extinguisher to serve the purpose when required.
• extinguishing agents used in the ' conventional fire extinguishers require high pressure to be converted to compressed liquid form by pressurizing to store. Most of them involve extinguishant filled with high pressure that further leads to problems of leakage, splashing off and bursting.
• the cylinder in which extinguishant is filled with high pressure requires the extinguisher to be thick walled so as to withstand the high pressure with which the extinguishant is filled.
• extinguishers involve the extinguishant which is higher in weight compared to the material involved in fire such as flammable gases and hence fail to extinguish such fire as the extinguishant settles down.
• the bottom ring is made up of Mild Steel or plastic or other such metal where the welding of bottom ring gets open and the extinguisher gets leaked on falling.
• plastic or rubber discharge pipe which has poor mechanical strength, limited efficiency and shelf life to withstand climatic conditions such as sunlight, rain water, cold and hot air, air pollution like petroleum, solvent or chemical fumes and hence gets easily cracked or broken failing to serve the purpose when required.
• the main object of the present invention is to provide an improved fire extinguisher which can be used to extinguish all kinds of fire without affecting the properties or damaging the material involved in the fire as well as to alleviate the problem related to the existing fire extinguisher assemblies.
• Another object of the present invention is to provide an improved fire extinguisher which controls the fire effectively at early stage preventing it to spread further and causes massive damages.
• Another object of the present invention is to provide an improved fire extinguisher having extinguishant which is filled in the cylinder at significantly reduced pressure.
• Yet another object of the present invention is to provide an improved fire extinguisher having extinguishant which does not alter the properties of the objects and material on fire due to its non reactive nature, enabling the further use of objects and material on fire.
• Yet another object of the present invention is to provide an improved fire extinguisher having extinguishant which does not contaminate with the objects and material on fire.
• Yet another object of the present invention is to provide an improved fire extinguisher having extinguishant which does not damage the objects and material on fire.
• Yet another object of the present invention is to provide an improved fire extinguisher having extinguishant which does not have residual effects and hence cleaning is not required after extinguishing the fire.
• Yet another object of the present invention is to provide an improved fire extinguisher which can be used to extinguish electrical fire also.
• Yet another object of the present invention is to provide an improved fire extinguisher which contains extinguishant that has a long shelf life and hence is durable.
• Yet another object of the present invention is to provide an improved fire extinguisher which does not create discharge visibility problems.
• Yet another object of the present invention is to provide an improved fire extinguisher which does not impart any risk of cold burns to the operator.
• Yet another object of the present invention is to provide an improved fire extinguisher which can be used for more than one time as it is possible to stop the expelling out of the extinguishant from the extinguisher as soon as fire is extinguished and use the rest of the extinguishant when another time the fire takes place.
• Yet another object of the present invention is to provide an improved fire extinguisher that does not require any skill to operate and is very convenient to use by everyone.
• Yet another object of the present invention is to provide an improved fire extinguisher which has no risk of splashing off of the extinguisher from the operator's hand.
• Yet another object of the present invention is to provide an improved fire extinguisher wherein generation of toxic gases is considerably reduced.
• Yet another object of the present invention is to provide an improved fire extinguisher wherein problems of corrosion are eliminated.
• Yet another object of the present invention is to provide an improved fire extinguisher which is completely leak proof.
• Yet another object of the present invention is to provide an improved fire extinguisher wherein the safety lock pin is easy to disengage when required.
• Yet another object of the present invention is to provide an improved fire extinguisher wherein the installation brackets are stronger and withstands the weight of the fire extinguisher.
• Yet another object of the present invention is to provide an improved fire extinguisher which is almost four times lighter in weight compared to the conventional fire extinguishers.
• Yet another object of the present invention is to provide an improved fire extinguisher wherein the extinguishant expels out properly.
• Yet another object of the present invention is to provide an improved fire extinguisher which efficiently controls the spreading of fire.
• Yet another object of the present invention is to provide an improved fire extinguisher discharge pipe has a higher mechanical strength, efficiency and shelf life to withstand climatic conditions such as sunlight, rain water, cold and hot air, air pollution like petroleum, solvent or chemical fumes and hence does not get cracked or broken easily.
• Yet another object of the present invention is to provide an improved fire extinguisher wherein problems related to valve operation are eliminated.
• Fig.1 Shows fragmented view, of proposed fire extinguisher
• Fig.2A Shows side view of proposed fire extinguisher in resting position
• Fig.2B Shows side view of proposed fire extinguisher in working position
• Fig.3A Front view of the plastic nozzle
• Fig.3B Rear view of the plastic nozzle Fig.3C Side view of the plastic nozzle
• the embodiment of the proposed invention is to provide an extinguishant used to extinguish the fire effectively and instantaneously.
• the composition of extinguishant in the proposed fire extinguisher ( 100) mainly comprises of extinguishing agent and expellant, whereby the extinguishing agent is a mixture of 2,2- Dichloro- l , l , l -trifluoroethane and Tetrailuoromethane and whereas the expellant is ' argon gas of 99.9% purity.
• the composition of extinguishant of the proposed fire extinguisher (100) comprises of: 2,2-Dichloro- l , l , l-trifluoroethane in proportion range of 90 to 95%,
• the preferable proportion of the said 2,2-Dichloro- 1 , 1 , 1- trifluoroethane is 93.1%.
• the preferable proportion of the said Tetrailuoromethane is 4.3%.
• the preferable proportion of the said argon gas is 2.6%.
• Vapor Pressure 1 1.2 psig at 25 C ( 77 F )
• the said extinguishant of the proposed fire extinguisher ( 100) being volatile in nature has the lower boiling point of 25.6°C is in liquid form at room temperature.
• the said extinguishant is filled up and stored in the cylinder ( 1) at lower pressure of 100PSI, preventing all the problems related to the high pressure.
• the extinguishant of the proposed fire extinguisher ( 100) when stored inside the cylinder ( 1) is in liquid state.
• the said extinguishant when discharge out from the fire extinguisher ( 100) is in liquid form and rapidly gets converted into gaseous form.
• the said extinguishant gets discharged in conical pattern and creates a uniform shower of extinguishant covering the fire, base instantaneously with large diameter and extinguish the fire by cooling and cutting off the oxygen supply.
• the extinguishant of the proposed fire extinguisher ( 100) is nonconductor of electricity, thus capable of being used for extinguishing fire on electrical equipments.
• the extinguishant of the proposed fire extinguisher ( 100) has been tested to check its electrical conductivity to confirm its ability to be used for extinguishing the fire on electrical equipments by the Underwriters Laboratory (UL) standards.
• the extinguishant of the proposed fire extinguisher ( 100) has been tested by UL standards to check the electrical conductivity.
• the proposed fire extinguisher ( 100) was well within the limit and the discharge current was between 25.8 to 525 ⁇ including target plate temperature of 380°C both for A.C and D.C power supply with maximum 16 sec discharge.
• the extinguishant of the proposed fire extinguisher ( 100) passes the test for electrical conductivity and thus is capable of extinguishing the fire on electrical equipment.
• the extinguishant of the proposed fire extinguisher ( 100) does not either alter the properties of objects and materials or damage the said objects and materials in the fire as it neither has residual effect nor it is reactive nor it contaminates the material involved in the fire.
• the said extinguishant is capable of extinguishing the fire efficiently allowing the further use of objects and materials in fire.
• the said material also involves flammable liquids.
• the extinguishant of the proposed fire extinguisher ( 100) has been tested to check its residual effect, reactivity and contamination with various objects and materials. Further, as the said extinguishant of the proposed fire extinguisher ( 100) does not leave any residue after extinguishing the fire, no cleaning is required once the fire is extinguished.
• the extinguishant of the proposed fire extinguisher (100) is capable of being used for extinguishing fire on different objects and material without altering the properties of objects and materials or damaging the said objects and materials in the fire as it neither has residual effect nor it is reactive nor it contaminates the material involved in the fire and enabling further use of the objects and materials in the fire.
• the shelf life of extinguishant of the proposed fire extinguisher ( 100) is at least 10 years during which the said extinguishant retains its effect intact without degradation and although after 10 th year the said extinguishant starts degrading the rate of degradation is so minimal that the said extinguishant does not affect the working of the fire extinguisher ( 100).
• Another major embodiment of the proposed fire extinguisher ( 100) is to provide an improved fire extinguisher ( 100) assembly as shown in Fig. 1 , Fig.2 [A, B] which mainly comprises of cylinder assembly (101) and valve assembly ( 102) whereby the
• Cylinder assembly (101) mainly comprises of: a cylinder ( 1) with a concave base and an opening hole at middle top having a threaded coupling on inner surface, ' provided to fill the extinguishing agent which is a blend of extinguishing gas and proprietary gas using the expellant; a deep tube ( 19) with 10° chamfer at bottom extending through the top middle hole of the cylinder ( 1 ) and touching the cylinder ( 1 ) bottom to allow complete discharge of the extinguishant from the cylinder ( 1); a base ring at bottom of the cylinder ( 1 ) to maintain the stability to stand on the plain surface; a threaded coupling on the inner surface of the opening hole of the cylinder ( 1 ) is provided to assemble the valve assembly ( 102) over the cylinder assembly ( 101 ) and
• valve assembly ( 102) is provided to discharge the extinguishant from the cylinder assembly ( 101) for extinguishing the fire, which mainly comprises of: a valve body (2) having four different connecting means namely
• a pressure gauge ( 18) assembled in the hole of the lower connecting means (2A) and parallel to side connecting means 1 (2C) through a chain ring (22) for indicating the correct extinguishant pressure; a chain ring (22) assembled behind the pressure gauge ( 18) to connect and support to the one end of the chain link (21 ); a male installation bracket (23) assembled at the lower connecting means (2A) using 2 screws for mounting on female installation bracket; a round handle ( 17) assembled at the lower connecting means (2A) on threaded protrusion perpendicular to the pressure gauge ( 18), cylinder ( 1) and male installation bracket (23) to hold the fire extinguisher (100) and to provide fix support to operate the valve and to press the valve lever ( 10); a pair of Poly Tetra Fluoro Ethylene (PTFE) ball washer namely lower ball washer (3AL) and upper ball washer (3AU) each having a hole in middle and assembled inside the valve body (2); a rotating S.S.
• PTFE Poly Tetra Fluoro Ethylene
• valve lever ( 10) which is assembled parallel and above the round handle (17) respectively through valve lever side bolt ( 1 1) at side connecting means 1 (2C) and through ball pin (6A) and nut (6B) at side connecting means 2 (2D) to rotate the S.S.
• valve lever side bolt ( 1 1) to fix and support the valve lever ( 10) at side connecting means 1 (2C);
• a ball pin (6A) which at one end connects the S.S. ball (4) assembled inside the valve body (2) through side connecting means 2 (2D) and on other end it connects the side pin free nut (5) and nut (6B) to hold the said valve lever ( 10) firmly and to rotate the S.S. ball (4) in a clockwise direction such that the hole of the S.S.
• ball (4) forms channel with respective hole of lower ball washer (3AL) and upper ball washer (3AU); a pair of coil spring, one coil spring (9A) which is assembled at side connecting means 1 (2C) between the valve lever side bolt ( 1 1) and valve lever ( 10) and other coil spring (9B) assembled at side connecting means 2 (2D) between the nut (6B) and side pin free nut (5), for pushing back the valve lever ( 10) automatically to stop supply of the extinguishant by rotating the ball pin (6A) and thus S.S. ball (4) in anticlockwise direction to allow the hole of the said S.S.
• a discharge pipe ( 12), through threaded couplings is connected to the cap nut (8) at its upper end and to the top nut (7) at its lower end to allow the flow of extinguishant to pass through the plastic nozzle ( 13) connected to the cap nut (8) ; a cap nut (8) connected to the discharge pipe (12) at upper end and to the plastic nozzle (13) at lower end, holds the said plastic nozzle (13) properly in the nozzle cap (16) through the threaded coupling; a plastic nozzle (13) attached at upper end of the cap nut (8) as shown in Fig. l, Fig.2[A, B] and
• a nozzle deflector (14) which is fixed to the plastic nozzle (13) using the deflecting screw (15) strikes further the plurality of droplets coming out from the plurality of discharge holes of the plastic nozzle (13) on to the nozzle cap (16) dividing the said plurality of droplets into smaller size multiple homogeneous droplets;
• a deflector screw (15) passing through the hole of the plastic nozzle (13) firmly holds the nozzle deflector (14) to the plastic nozzle (13);
• the said deep tube (19) is also called siphon tube.
• the length of the deep tube (19) is kept such that it touches the bottom of the cylinder (1).
• the said deep tube (19) has chamfer of 10° at bottom such that the cross- sectional diameter of the deep tube (19) and diameter of the top nut (7) remains same allowing complete discharge of the extinguishant from the cylinder (1) to discharge pipe (12).
• the shape of the bottom of the cylinder (1) is kept 10° concave in order to expel out each drop of the extinguishant.
• the cylinder assembly (101) of the proposed invention is constructed in highly efficient manner which allows the utilization of total amount of extinguishant in controlling the fire by the proposed improved fire extinguisher (100).
• the pressure gauge (18) of the proposed fire extinguisher (100) is pre- calibrated gauge based on the behavior of the extinguishant with reference to the atmospheric temperature difference.
• the said pressure gauge (18) ensures the indication of correct extinguishant pressure so that the proposed fire extinguisher (100) gets operated correctly the way it is designed and performs to extinguish the fire without any complication.
• the proposed fire extinguisher (100) is mounted on the wall mounting female installation bracket through the male installation bracket (23) of the proposed fire extinguisher (100).
• the said female installation bracket is made out of S.S. to ensure corrosion free strong mounting on the wall using S.S. screw fittings.
• the round handle (17) of the proposed fire extinguisher (100) is provided to hold the fire extinguisher (100) and to provide fix support to operate the valve and to press the valve lever (10).
• the said handle (17) has in built S.S. bolt.
• the said handle (17) being made up of bakelite is highly stable at atmospheric condition and is corrosion free. Further, the length of the S.S. bolt is almost 70% of the length of the handle (17), thus even if the said handle (17) gets broken because of high impact still the fire extinguisher (100) can be easily operated.
• the said upper ball washer (3AU) and lower ball washer (3AL) are neither porous nor have any atmospheric and extinguishant effect over them. Further, the said upper ball washer (3AU) and lower ball washer (3AL) are neutral to extinguishing agent and have self lubricating property without any sticky effect. Thus, the said upper ball washer (3AU) and lower ball washer (3AL) all together provides leak proof, jam proof and smooth functioning of the valve assembly (102) of the proposed improved fire extinguisher (100).
• the said discharge pipe (12) being made up of S.S. has high mechanical strength and is smoothly curved to allow the easy flow of extinguishant through plastic nozzle (13).
• the said safety lock pin (20) is so designed that it is easy to disengage.
• the multiple droplets of extinguishant striking out from the nozzle cap (16) for extinguishing the fire in form of conical flow are air pocket free homogeneous droplets.
• the extinguishant gets discharged out in form of uniform shower of the multiple homogeneous droplets and cover the fire base with nine to ten times more diameter than the diameter of the nozzle cap (16) to control the fire instantaneously.
• the said cylinder (1), valve body (2), Lower ball washer (3AL), Upper ball washer (3AU), side pin washer (3B), washer (3C), top nut washer (3D), S.S. ball (4), side pin free nut (5), ball pin (6A), nut (6B), top nut (7), cap nut (8), coil spring (9 A) (at side connecting means 1 (2C)), coil spring (9B) (at side connecting means 2 (2D)), valve lever (10), valve lever side bolt (11), discharge pipe (12), nozzle deflector (14), deflector screw (15), nozzle cap (16), deep tube (19), safety lock pin (20), chain link (21), chain ring (22), male installation bracket (23), tamper seal (24) are made from either of the below mentioned high grades of the S.S. facilitating the corrosion free fire extinguisher (100).
• S.S. grades provide fire extinguisher with above mentioned characteristic features.
• the preferred grade of S.S. used for manufacturing the fire extinguisher to operate in a best mode is S.S.
• the extinguishant of the proposed fire extinguisher (100) is such that it can be filled and stored at a low pressure of 100 PSI enabling a thin walled cylinder to be used for manufacturing a durable fire extinguisher resulting in considerably reducing the weight of the fire extinguisher.
• the proposed fire extinguisher (100) is able to be used for more than one time as it is possible to stop the expelling out of the extinguishant from the fire extinguisher (100) once the required quantity of extinguishant is expelled out for extinguishing the fire and the rest of the extinguishant can be used for extinguishing the fire another time when the fire takes place.
• the proposed fire extinguisher was tested for its strength, durability and reliability; to check leakage and bursting. Standard tests were performed based on guidelines of Underwriters Laboratories (UL).
• UL Underwriters Laboratories
• the key tests namely proof test and burst test are essential for assuring that the fire extinguisher is capable of withstanding high pressure and reliable in avoiding of leakage and bursting.
• the pressure maintained inside the cylinder is three times higher than working pressure of the fire extinguisher to check if leakage occurs between any of the parts of the fire extinguisher.
• the working pressure of the proposed fire extinguisher (100) is 100 PSI.
• the pressure maintained in cylinder (1) of the proposed fire extinguisher (100) was 300, 305 and 307PSI respectively for 61, 60 and 63 seconds to check if leakage occurs between any of the parts of the fire extinguisher (100).
• the proposed fire extinguisher (100) passed the proof test.
• the pressure maintained inside the cylinder is eight times higher working pressure of the fire extinguisher to check if the cylinder busts at such high pressure and if not then leakage occurs between any of the parts of the fire extinguisher and if.
• the pressure maintained inside the cylinder (1) of the proposed fire extinguisher (100) was 800, 810 and 815PSI respectively for 60, 62 and 61 seconds to check if the cylinder (I) busts at such high pressure and if not then leakage occurs between any of the parts of the fire extinguisher.
• the proposed fire extinguisher (100) passed the bust test.
• axis shall not found between exceed 13.6kg 6.4kg to 9.8 kg with with 30 sec 30 seconds duration. duration . which is well within the range of UL standard.
• bracket should extinguisher was take five times found to carry the load of the total five times load of weight of the the total weight for extinguisher or more than 10
• Duratio extinguisher held vertically up n vertically up and and was the to be discharged contents were with complete found to be valve open discharged to gas condition.
• the point within the contents should range of 8 to 12 discharge to gas seconds which is point in well within the minimum 8 range of UL seconds. standard.
• Rate of UL 2129, Sec 31 An extinguisher The proposed Flow charged with its extinguisher was rated capacity is found to be to be discharged discharging within for a period of the range of UL two-thirds of its standard.
• Tempera mass content found to be ture should discharge discharging the
• Cycling mass content found to be should discharge discharging the after completion content in the of temperature range 90 to 99.90 cycling test % which is well within the range of UL standard.
• expansion of the extinguisher cylinder should cylinder was found not exceed 10% of to be expanding in the total the range of 6 to expansion after 10% of the total proof test i.e. 300 expansion at high psi. pressure of more than 800 psi which is well within the range of UL standard.
• valve shall to be withstand 300 withstanding psi for one min the pressure of without 300 psi within leakage. the time limit of
• valve various extinguisher parts shall valve was found remain in to be remaining assembled assembled when condition for exposed at minimum 1 pressure of 600 min at twice psi for 4 the proof test minutes with no i.e. 600 psi. leakage found.
• the expellant-gas pressure and charge for 1 year weight loss was in at a temperature range of 0 to 3 %. of 21 ⁇ 4°C (70
• the charged with discharge current lOOkV power was between 25.8 supply and to be to 525 ⁇ including discharged on target plate earth copper temperature of plate from the 380°C both for A.C distance of 10 & D.C power inch.
• the complete valve assembly including discharge nozzle, stem, pressure gauge, and siphon tube assembly is to be disassembled during the first, tenth, twentieth, and thirtieth cycles. After the tenth cycle, an extinguisher having polymeric parts is to be subjected to the Aging Tests Polymeric
• test duration is to be reduced to 90 days at 100°C (212°F) for a valve and valve part, and 45 days at 100°C (212°F) for a siphon tube assembly and
• the flour The flour
• test instrument should be in operational condition and pass through proof & . rupture test.
• c shall be no nozzle
• Corrosio fire extinguisher within the n must be requirement and operational and found to be rechargeable even corrosion free and after all parts of could be easily the extinguisher, operated and including the recharged.
• an improved fire extinguisher (100) is mounted on the wall mounting female installation bracket by sliding in the inbuilt male installation bracket (23) of the proposed fire extinguisher (100).
• the proposed fire extinguisher (100) has to be slide out from the female installation bracket using a round handle (17).
• first of all safety lock pin (20) fastened into an extension with hole (25) has to be taken out which breaks the tamper seal and allows an operator of fire extinguisher (100) to press the valve lever (10).
• a ball pin (6A) holding the valve lever (10) firmly at side connecting means 2 (2D) rotates.
• the rotating S.S. ball (4) which is further connected to the said ball pin (6A) rotates in clockwise direction such that the hole of the rotating S.S. ball (4) forms channel with the respective hole of lower ball washer (3AL) and upper ball washer (3AU) without any air gap as shown in Fig.2[B], facilitating the path to the extinguishant to pass from the cylinder (1) to discharge pipe (12) via hole of lower ball washer (3AL) and upper ball washer (3AU). Further from the discharge pipe (12), the extinguishant passes to the plastic nozzle (13) connected via the cap nut (8).
• the said plastic nozzle (13) due to the plurality of discharge holes provided at periphery as shown in Fig.3[A, B, C, D] evenly distribute the flow of extinguishant coming out from the discharge pipe (12) into plurality of droplets and further strike them out on the outer surface of the nozzle deflector (14) in shower manner.
• the said nozzle deflector (14) which is connected to the said plastic nozzle (13) through the deflector screw (15) strikes further the plurality of droplets coming out from the plurality of discharge holes of the plastic nozzle (13) on to the nozzle cap (16) dividing the said plurality of droplets into smaller size multiple homogeneous air pocket free droplets.
• the nozzle cap (16) fixed to the cap nut (8) being conical in shape, facilitates the conical flow of the homogeneous uniform discharge shower of the multiple droplets striking out on the inner surface of the nozzle cap (16) from the outer surface of the nozzle deflector (14) to cover the larger area of the fire by utilizing entirely the flow of multiple homogeneous droplets to control the fire instantaneously.
• the fire extinguisher (100) can be again mounted on the wall mounting female installation bracket by sliding in the inbuilt male installation bracket (23) of the proposed fire extinguisher (100) and can be used further in the same manner for multiple times till the total content of extinguishant expels out. Once, the total content of extinguishant expels out the cylinder (1) can be refilled and used again in the same manner.
• Extinguishant is filled and maintained inside the cylinder at quite lower pressure of 100PSI. Facilitates the conical shape shower of multiple droplets of extinguishant for extinguishing the large area of fire base instantaneously.
• Extinguishing fire using the present extinguisher does not alter the properties of the material in the fire, enabling them to be used further.
• Extinguishing fire using the present extinguisher does not damage the objects and material on the fire.
• Extinguishing fire using the present extinguisher does not contaminate the objects and material on the fire.
• the extinguishant used in the present invention is not a conductor of electricity and so there are no risks of fatal accidents like electric shocks and hence can be used to extinguish electrical fires also.
• the extinguishant used in the present invention is able to extinguish fire on flammable gases as well as flammable liquids.
• the extinguishant used in the present invention is able to extinguish fire on cooking oils & fats and alike without contaminating the material involved in the fire.
• the proposed fire extinguisher completely expels out extinguishant.
• the extinguishant from the extinguisher cuts off the oxygen supply to the fire and hence extinguishes the fire.
• the proposed extinguisher can be used for more than one time as it is possible to stop the expelling out of the extinguishant from the extinguisher as soon as fire is extinguished.
• the present fire extinguisher prevents all the problems associated with corrosion.
• the safety lock pin is made of S.S. which has a high metal strength and no risks of corrosion so that it does not break easily and is easy to disengage when required.
• the present extinguisher has installation brackets made of S.S. which withstands the weight of the fire extinguisher and does not get corroded.
• the present invention is completely leak proof and hence serves the purpose of fire extinguishing when required.
• the low pressure extinguishant filled in the present extinguisher does not require thick walled cylinders and hence make the extinguisher light weight.
• the present extinguisher consists of S.S. ball which prevents leakage and has longer shelf life and making the valve assembly the extinguisher durable.
• Deep tube of the proposed extinguisher is made of S.S. and hence has a high durability and there are no risks of bends, cracks or breakage because of pressure.
• the deep tube of the proposed extinguisher have chamfered cut at the bottom at around 10° that does not leave behind unused extinguishant after complete discharge which enhances the efficiency of extinguishing the fire.
• the bottom ring is made up of S.S. and assembled in a manner to prevent leakage even if it falls.
• the present extinguisher consists of a nozzle with multiple holes facilitating shower type of discharge of the extinguishant avoiding splashing of fire and hence controls the spreading of fire.
• the discharge pipe of the present extinguisher is made of S.S. and so has a higher mechanical strength, efficiency and life to withstand climatic conditions such as sunlight, rain water, cold and hot air, air pollution like petroleum, solvent or chemical fumes and hence does not get cracked or broken serving its the purpose when required.
• the present extinguisher uses a standard calibrated pressure gauge which is calibrated in reference to the extinguishant used in the present extinguisher, and thus indicates the right designed pressure avoiding the problems associated with the working of the extinguisher such as splashing of the material on fire, leakage, metal fatigue and other problems related to valve operation.

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• Health & Medical Sciences (AREA)
• Public Health (AREA)
• Business, Economics & Management (AREA)
• Emergency Management (AREA)
• Fireproofing Substances (AREA)
• Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)

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• 2012
  • 2012-11-08 WO PCT/IN2012/000736 patent/WO2013105110A2/fr not_active Ceased

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