| 摘要 |
PROBLEM TO BE SOLVED: To provide a water discharge nozzle for fire extinguishing which discharges water from the nozzle first in a stop state, then in a spraying water state having a hollow cylindrical shape, and finally in a spraying water state having a fully conical shape and carries out fire extinguishing efficiently by minimizing a reaction force generated when starting fire extinguishing. SOLUTION: An operation tube 2 is screwed into the front end of a water discharge tube 1 so that it can advance or retreat freely. Pressurized water from the water discharge tube 1 is sprayed from a circular outer spraying port 9 between a deflector 7 mounted in one piece on the front end of a fixed axis 6 arranged in the middle of the operation tube 2 and an open end of the operation tube 2, and is first sprayed in a hollow cylindrical shape and then in a conical shape. A water discharge passage 13 is formed in the fixed axis 6. An inflow port 15 communicating with the inside of the operation tube 2 is formed on the rear end of the water discharge passage 13, and a central spraying port 14 is formed on the front end of the water discharge passage so that it opens in the center of the deflector 7. Discharging water from the central spraying port 14 is sprayed into the discharging water sprayed from the outer spraying port 9. COPYRIGHT: (C)2007,JPO&INPIT
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