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空气泡沫比例混合器是空气泡沫灭火设备之一,是完成泡沫液和水按一定比例混合的设备。目前,在我国商业油库的消防设备中,大部分使用的都是空气泡沫负压比例混合器(简称负压混合器)。这种负压混合器安装在消防水泵的进出口之间的旁通管上,喷嘴的进口与消防水泵出口连接,扩散管的出口与消防水泵进水口连接。当启动消防水泵后,没有压力的水进入负压混合器,经过喷嘴喷入扩散管。由于喷嘴口径很小,当水流由喷嘴喷出时流速很快,从而在真空室内造成负压,这时储罐中泡沫液在大气压力作用下,通过吸液管和控制孔
Air foam ratio mixer is one of the air foam fire extinguishing equipment, is to complete the foam liquid and water by a certain percentage of mixing equipment. At present, most of the fire-fighting equipment used in commercial oil depots in our country are air-foam negative pressure ratio mixers (hereinafter referred to as negative pressure mixers). The negative pressure mixer is installed on the bypass pipe between the inlet and outlet of the fire pump. The inlet of the nozzle is connected with the outlet of the fire pump. The outlet of the diffuser pipe is connected with the inlet of the fire pump. When the fire pump is started, no pressure of water into the negative pressure mixer, spray nozzle into the diffuser. As the nozzle diameter is very small, when the water flow from the nozzle when the rapid flow, resulting in a negative pressure in the vacuum chamber, then the foam in the tank under atmospheric pressure through the pipette and control holes