Fire extinguishers – Portable vessels – Gas pressure
Reexamination Certificate
1999-05-06
2001-02-20
Brinson, Patrick (Department: 3752)
Fire extinguishers
Portable vessels
Gas pressure
C169S030000, C169S074000, C169S089000, C239S372000, C222S402150
Reexamination Certificate
active
06189625
ABSTRACT:
FIELD OF INVENTION
This invention relates to a liquid mist fire extinguisher and more particularly a low pressure water atomizing fire extinguisher.
BACKGROUND TO THE INVENTION
Fires are classified as A, B, C or D as follows: Class A: ordinary combustibles; Class B: flammable liquids; Class C: electrical fires and Class D: flammable metals. Fire extinguishers are certified in Canada and the United States by ULC and UL respectively according to their effectiveness in suppressing the fires of the various classes. A standard extinguisher with an A:B:C rating for example, is effective in suppressing A, B and C class fires.
To achieve an A:B:C rating, extinguishers to date have used either dry chemicals or halon. The use of dry chemicals results in a messy and sometimes toxic cleanup. Halon is a clean alternative but has been banned by the Montreal Protocol on Substances that Deplete the Ozone Layer.
Water has also been used but prior art water extinguishers have not achieved an A:B:C rating. The standard water extinguisher for example discharges a solid stream of water from a pressurized canister and has a limited Class 2A rating.
Another type of known water extinguisher discharges a spray of water droplets and utilizes the same amount of water as the standard extinguisher. This extinguisher typically operates at about 100 psi. While this water extinguisher has been rated A:C, it does not generate the fine atomized mist required for a class B rating.
It is a feature of the present invention to provide an extinguisher in which water and air are stored together and released simultaneously and separately to produce a fine liquid mist, capable of class A:B:C rating.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided an apparatus for producing a fine liquid mist, comprising a container for holding a gas and liquid under pressure; valve means for simultaneously releasing said gas and said liquid separately from said container; feed means for feeding said gas and said liquid separately to a nozzle; said nozzle including a mixing chamber and outlet orifices for emission of said liquid mists.
In another embodiment of the present invention, there is provided a release valve for simultaneously releasing a gas and a liquid separately from a pressurized container, comprising a first valve controlling a liquid outlet from said container; a second valve controlling a gas outlet from said container; means for feeding said liquid and said gas separately from said valves; means for actuating said valves, simultaneously.
In a further embodiment of the present invention, there is provided a liquid mist fire extinguisher, comprising a container for holding a gas and a liquid under pressure; a valve assembly at an upper end of said container; valve means for simultaneously releasing said gas and said liquid separately from said container; a hose for feeding said gas and said liquid separately through a nozzle; said nozzle assembly including means for feeding said gas and said liquid separately through a mixing chamber, and exiting orifices in an end surface of said nozzle assembly for issue of mixed gas and liquid in a fine mist.
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Brinson Patrick
Ganey Steven J.
McFadden Fincham
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