Fire extinguishers – Special applications – For vehicles
Patent
1998-01-22
1999-11-16
Kashnikow, Andres
Fire extinguishers
Special applications
For vehicles
169 73, 169 9, A62C 307
Patent
active
059840161
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a fire extinguisher for closed spaces.
In a previously known type of a fire extinguisher for closed spaces there is used halon which from the fire extinguisher is supplied to the closed space and displaces the oxygen therefrom so that a rapid and effective fire extinguishing is obtained also in respect of fires in oil, petrol, solvents and electric systems. Fire extinguishers working with halon are extremely effective for extinguishing fires in closed spaces, such as in the motor space of vehicles and boats. Especially in racing cars the use of fire extinguishers working with halon has found an extended use. A drawback of fire extinguishers working with halon is the fact that halon destroys the ozone layer of the earth. It has therefore been decided on an international basis that the use of fire extinguishers working with halon shall be terminated within the next few years.
In addition to fire extinguishers working with halon it is previously known to use fire extinguishers working with powder or carbon dioxide snow for extinguishing fires in closed spaces. Fire extinguishers working with powder are effective but a drawback is that the powder extends over large areas and penetrates into small spaces in such a way that a decontamination is difficult to conduct. Powder from a powder extinguisher can also provide damages to for example a hot motor at a fire in a vehicle, and subsequent to extinguishing a fire in a motor space it is necessary completely to recondition the motor of the vehicle because of powder which has penetrated the motor at different locations.
The use of fire extinguishers working with carbon dioxide snow is dangerous for reasons of health, and the spraying of carbon dioxide snow at a fire in for example the driving compartment of a vehicle can lead to serious damages or even to the death for persons present in the driving compartment.
Certain prior art fire extinguishers of another type than fire extinguishers working with halon require that the fire extinguishers take a certain position to work in a correct way. Of course, this is a drawback if a fire brakes out in a vehicle which ends up upside-down, in which case a fire extinguisher of this kind is not completely emptied.
The object of the invention is to provide a fire extinguisher for closed spaces having the same good properties as a fire extinguisher working with halon without causing the risk for damages to the environment and persons, provided by the use of halon.
In order to comply with this object the fire extinguisher according to the invention is characterized by a pressure container having a release valve and containing in association with the release valve a extinguishant liquid, the container having at the opposite side from the extinguishant liquid in relation to the release valve a pressurized driving gas for discharging the extinguishant liquid from the pressure container at a high pressure when the release valve is activated, and by at least one nozzle connected with the release valve for atomizing the extinguishant liquid supplied to the nozzle from the release valve at a high pressure for creating a liquid fog filling up the closed space.
The liquid fog created by the fire extinguisher according to the invention is capable of filling up a closed space in which a fire has broken out and to displace the oxygen in the space, the liquid fog having at the same time a cooling action. By the displacement of the oxygen and the cooling action the fire broken out in the closed space is extinguished also in the case that extremely flammable materials, such as oil, petrol, solvents and the like have caught fire.
It is suitable that the extinguishant liquid is constituted by water, the fire extinguisher creating when it is activated a liquid fog consisting of water. The use of water has the advantage that the water is friendly to the environments, unharmful to people and animals and cheap. It is possible to add to the water an agent reducing the surface tension, for example a tenside, which provid
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Douglas Lisa Ann
Kashnikow Andres
Teknikbolaget AB
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