When the mobile foam tank is extinguishing the fire, the pipe joints at both ends of the pipeline proportional mixer are connected to the fire hose and connected to the pressure water source. When water with a pressure of not less than 0.6MPa flows through the proportional mixer at a very high speed When the nozzle is used, due to the diffusion effect of the lateral movement of the jet particles, a vacuum (negative pressure) is formed in the chamber of the proportional mixer, so the foam liquid in the foam liquid storage tank enters the mixer through the suction pipe under the action of atmospheric pressure, and the pressure Water is mixed to achieve a certain proportion of mixed liquid. When the mixed liquid with a certain pressure flows to the spray gun, a certain amount of air will be sucked in because of the performance of the spray gun. Make the foam mixture foam. So as to achieve the effect of foam fire extinguishing.
The fixed foam tank is mainly composed of a foam liquid pressure storage tank and a PHY-type pressure proportional mixer made of the Venturi principle. When the water in the system pipe network flows through the proportional mixer decompression orifice, the There will be a pressure difference before and after. A part of the water (3% or 6%) at the high pressure enters the tank through the water inlet pipe of the foam tank, squeezes, and squeezes the foam liquid in the foam tank through the outlet pipe of the foam tank to the low pressure part of the proportional mixer and mixes with water to form Foam mixed liquid, the formed foam mixed liquid is output to foam generating equipment, and mixed with air to generate foam.
