| abstract |
An object of the present invention is to provide an environment-friendly configuration in which fire heat is efficiently transmitted to a fusible material of a heat sensitive body to reduce operation delay, and further. A heat-sensitive body 16 of a closed sprinkler head has a split casing in which a hollow cylindrical body having through holes at both ends is divided so as to include a part of the outer surface, and is easily melted between the split casings. The assembly structure is such that the periphery of the sexual substance 20 is sandwiched. The heat sensitive body 16 is integrally formed with fan-shaped heat collecting fins 19a and 19b at each end of the outer surface of the divided casing. The fusible substance 20 is formed by molding a low melting point alloy, inorganic compound or organic compound having a melting point between 50 ° C. and 150 ° C. into a substantially donut shape having a rectangular cross section. [Selection] Figure 1 |