| 摘要 |
PROBLEM TO BE SOLVED: To provide sprinkler fire-extinguishing equipment to be primarily installed in buildings. SOLUTION: This sprinkler fire-extinguishing equipment which has sprinkler heads connected to a secondary side pipe provided in a secondary side of a water flow detector via a plurality of downward pipes is provided with connecting pipes for connecting the respective sprinkler heads to the lower ends of the plurality of downward pipes, the connecting pipes have drain outlets respectively, narrow pipes are linked and connected to the respective outlets and a constantly closed drain valve is provided at the ends of the narrow pipes via a collecting pipe. Alternatively, a vacuum pump is connected to the secondary side pipe via a constantly closed on-off valve, the vacuum pump is actuated by opening the on-off valve, the insides of the secondary side pipe and a plurality of downward pipes are set into high-vacuum states to evaporate and remove water remaining in the plurality of downward pipes. COPYRIGHT: (C)2008,JPO&INPIT
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