| 摘要 |
PROBLEM TO BE SOLVED: To provide a sprinkler fire-extinguishing system which does not prevent a fall of a valve body when a thermosensitive degradation mechanism drops and has a ceiling plate which is hardly detached from a sprinkler head in the sprinkler fire-extinguishing system of a negative pressure type.SOLUTION: A ceiling plate 120 has a plurality of window parts 123 on a cylindrical part 122 mounted on an outer peripheral surface of a frame 70. In a state where the ceiling plate 120 is mounted on a proper mounting position in a sprinkler head 2, an opening part 72 of the frame 70 is opened by the window parts 123 so that a negative pressure environment which prevents a fall of a valve body 80 in association with a drop of a thermosensitive degradation mechanism 100 of the sprinkler head 2 is not created inside the frame 70. In addition, an engaging protrusion 125 provided on an inner peripheral surface of an engaging piece 124 formed between the adjacent window parts 123 engages a groove 73 provided on an outer peripheral surface of the frame 70 for mounting the ceiling plate 120 on the sprinkler head 2. |
