| 摘要 |
PROBLEM TO BE SOLVED: To obtain a foaming device of the fire-extinguishing foam in which a foaming performance is improved, sufficient foaming is obtained even by protein fire-extinguishing chemicals, and the miniaturization of the device is made possible.SOLUTION: A foaming device of the fire-extinguishing foam comprises a foaming cylindrical body 4 provided with an orifice part 1 for injecting a foam fire-extinguishing chemical liquid mixture obtained by mixing foam fire-extinguishing chemicals introduced with water and an air intake 2 in a primary side, and provided with a radiation port 3 in a secondary side. The foaming device of the fire-extinguishing foam sucks air from the air intake 2 based on a negative pressure by the injection of the foam fire-extinguishing chemical liquid mixture injected in the foaming cylindrical body 4 from the orifice part 1, and stirs and mixes the foam fire-extinguishing chemical liquid mixture with the air in the inside to thereby be foamed. The orifice part 1 is constituted of a primary orifice plate 6 and a secondary orifice plate 7, and a resonant room 8 is formed between the primary orifice plate 6 and the secondary orifice plate 7. A contraction cylindrical body 11 is provided in the primary side of the primary orifice plate 6, and a contraction area ratio (CR) between a hole 9 provided to the primary orifice plate 6 and an inner diameter of the contraction cylindrical body 11 is assumed 0.3-0.8.SELECTED DRAWING: Figure 2 |
