(A) Description 
 The device for fighting Class B fires and A, B, mixed fire; both independent fire protection equipment, and can play a supporting fighting role with the large fixed foam fire extinguishing system, is mainly applied to the oil fields, tank farms and refineries, oil chemical companies, oil ports, hangar, garage, warehouse, gas stations and other places. With good mobility, flexibility, and can grab with the bubble, bubble, etc. composed of low, medium and high expansion foam fire extinguishing system. 
 (B) works 
 The tank of the device by the Q235 steel made of PHF-type negative pressure proportioner, which is the use of Venturi management principles so that the exit of the formation of negative pressure, foam liquid proportioner inhalation from the tank through the pipette with water mixed foam mixture, the formation of air bubbles through the air bubble gun to put out the fire.