36 results about "Compressed air foam system" patented technology

A system for a firefighting vehicle including a single compressor, driven by the engine of the firefighting vehicle, which generates a compressed fluid supply for operation of both the compressed air foam system and air brakes of the firefighting vehicle. The system can include a fluid storage tank that receives compressed fluid generated by the compressor. The storage tank can be in fluid communication with a dryer and a foaming system. The dryer dries a portion of the compressed fluid and supplies the dry fluid to one or more brake system tanks, which further provide a fluid supply to one or more air brakes of the vehicle to provide a braking force to stop the vehicle. An optionally undried portion of the fluid in the fluid storage tank can be in communication with a conduit which is further in communication with a foam supply and a liquid supply which mix with the compressed fluid to create a compressed fluid foam firefighting material.

The invention relates to a pressure balancing device for a compressed air foam system. The pressure balancing device comprises a fed air adjustment valve, a pressure balancing valve and an air compressor. The fed air adjustment valve is connected between an air collection opening of the compressed air foam system and the air compressor, and the fed air adjustment valve is connected with the pressure balancing valve through an air pipe. The pressure balancing device is characterized in that the fed air adjustment valve comprises a first valve body shell and a piston which is arranged inside thefirst valve body shell and can move up and down, and the airflow amount of the atmosphere entering the air compressor is controlled through vertical movement of the piston; and the pressure balancingvalve comprises a second valve body shell and a rigid piston which is arranged in the second valve body shell and can move up and down. According to the pressure balancing device for the compressed air foam system, the air pressure of the system can be effectively adjusted through the mechanical pressure balancing valve.

The invention relates to a compressed air foam side spraying and discharging device and a using method. Each discharging pipe is a straight pipe with one end being a closed end, the other end being open as a compressed air foam inlet, the pipe length L being 2 m to 20 m and the diameter D being 20 mm to 200 mm or a bent pipe with a certain radian; a plurality of rows of discharging holes with the distance d being 20 mm to 100 mm are evenly distributed in the surface of each discharging pipe; the hole diameter of the discharging holes is 1 mm to 30 mm; the included angle beta between the discharging holes ranges from 10 degrees to 35 degrees; the ratio of the area Al of the cross section of the foam inlet of each discharging pipe to the total area A2 of the cross sections of the corresponding discharging holes should meet the formula (please see the formula in the description); a foam branch pipe communicates with the two discharging pipes through connection pieces; and once a fire happens, a compressed air foam system provides compressed air foam for the discharging pipes according to set characteristic pressure, then the compressed air foam is evenly sprayed to a fire protection area through the discharging holes in different positions, and the beneficial effects that the device is simple in structure, safe and reliable, uniform in foam spraying, wide in protection range, convenient to install and use, high in foaming expansion rate, long in drainage time, high in stability and high in fire extinguishing efficiency are achieved.

The invention relates to a compressed air foam hydrant system of a tunnel rescue station and a fire extinguishing method. When a fire happens at the tunnel rescue station, field operators open one or more compressed air foam hydrants and press a start button; a system controller starts a compressed air foam generating device, a sectional control valve is started, the water flow is adjusted automatically according to the number of signals fed by alarm control units, and the foam fluid and air flow are also automatically adjusted according to the water flow, so that compressed air form is formed; the field operators hold foam guns with hands to align at the ignition area of a train so as to jet the compressed air foam, so that targeted fire extinguishing is achieved; and after the fire is extinguished, the system recovers to the initial state of the normal condition. Through the mode that the dual foam gun compressed air foam hydrants are adopted, the situation that the whole hydrant system fails when one set of hydrant breaks down is avoided, the safety and reliability of the system are ensured, the foam flow of each single foam gun can be reduced, and accordingly the foam guns are easier to control. The safety, reliability and high fire extinguishing efficiency of the system are ensured.