Fire extinguishers – Fluid systems – Plural source – mixing in transit
Patent
1992-12-28
1994-03-08
Mitchell, David M.
Fire extinguishers
Fluid systems
Plural source, mixing in transit
169 44, A62C 502
Patent
active
052919510
ABSTRACT:
Fire fighting apparatus for generating air compressed foam having both a water and a surfactant metering device for dispensing controlled and discrete quantities of both into a mixing conduit where they combine into a foam solution. The foam solution is combined with air prior to being injected within a compression chamber of an air compressor device. Foam is generated by compression of the air-foam solution and then is discharged through a discharge device. The air compression device is also controlled to dispense a discrete quantity of foam therefrom in correlation with the discrete quantities dispensed from the other two metering devices. The quantitative dispensing coordination of the air compression device with the two metering devices makes all three devices both relational and proportional in the cooperative generation of compressed air foam, and thus ensures prompt production of constant quality foam. The relational and proportional condition is achieved in a preferred mechanical embodiment by incorporating a common, concentric drive shaft driving all three dispensing devices, each of which is a rotary vane pump. In an electrical embodiment, the relational and proportional condition is achieved by an electric drive motor driving each dispensing device at a pre-set R.P.M., each motor being, connected to and controlled by a programmable control device Mechanical and electrical embodiments have devices for monitoring and controlling a variety of operational parameters to further enable prompt production of constant quality air compressed foam.
REFERENCES:
patent: 4345654 (1982-08-01), Carr
patent: 4981178 (1991-01-01), Bundy
patent: 5096389 (1992-03-01), Grady
patent: 5113945 (1992-05-01), Cable
patent: 5145014 (1992-09-01), Eberhardt
Hoge Gary C.
Mitchell David M.
Utah La Grange, Inc.
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