| 摘要 |
PROBLEM TO BE SOLVED: To heighten the sensitivity without lowering the support strength of a heat collection part.SOLUTION: In a closed type sprinkler head 10, a hot air flow of a fire is by a thermosensitive operation part 22, and when a solder alloy 42 is fused, the part is decomposed to release support for a valve body 20 and discharge water for fire-fighting from a nozzle 18. A heat insulating cylindrical body 40 axially increased in heat insulating distance is disposed between a heat collection part 48 including thermosensitive plates 44-46 and a frame 14 side balancer 36, and a stepped hole 36b for securing the strength of the heat insulating cylindrical body 40 is formed inside an extending part 36a of the lower end of the balancer 36 to store the heat insulating cylindrical body 40. |
