二．工作原理
work principle
空气泡沫枪进水口端与消防水带连接，吸液管接口与吸液连接，吸液管另一端插入泡沫液桶内，当水流以0.7MPa压力通过水带进入枪内，经喷嘴喷出时，枪体内在水流的作用下形成负压，此时泡沫液通过吸液管吸入枪体内与水混合，当混合液由喷嘴射出时，由于射速再次形成负压，吸入大量空气与混合液混合，当经过枪筒使空气泡沫混合膨化，空气泡沫达到平衡后由枪筒喷出。
foam fire branch inlet end and the fire hose connection, to absorb fluid pipe interface and absorb fluid connection, to absorb fluid pipe the other end into the liquid foam inside bucket, with 0.7 MPa pressure when water flow through the water into the gun within the nozzle jet, the gun in the role of water in the body formed under negative pressure, the liquid foam at this time by smoking gun body in liquid pipe is mixed with water, and when the mixture by injection nozzle, because again firing rate forming negative pressure, and a lot of air inhaled with the mixture mixing, when after air bubble mixing barrel expanded, and the air bubble to balance out the barrel.
三．性能参数
performance parameters
产品型号 | 混合液额定流量（L/s） | 额定工作压力（MPa） | 发泡倍数（N） 20℃时 | 25%析液时间 20℃/min | 射程（m） | 流量充差 （%） | 混合比（%） |
QP4/0.7Z | 4 | 0.7 | 5≤N﹤20 | ≥2 | ≧18 | ±8 | 3～4或6～7 |
