Sprinkler head
A sprinkler head 1 includes a head body 10 having a water discharging cylinder 16 in the interior thereof, a frame 20 connected to the head body 10 , a valve body 30 provided in the interior of the frame 20 and closing a water discharging port 12 of the water discharging cylinder 16 , a thermosensitive portion 51 configured to support the valve body 30 , and a disk spring 64 provided between the valve body 30 and the thermosensitive portion 51 . A set screw 65 to be coupled to the thermosensitive portion 51 is provided under the valve body 30 , and the set screw 65 is inserted into a through hole 64 a at the center of the disk spring 64 . The set screw 65 includes a head portion and a leg portion, and the head portion is formed to be higher than the height of the disk spring 64.
1. A sprinkler head comprising:
a head body having a water discharging cylinder in the interior thereof;
a frame connected to the head body;
a valve body configured to close a water discharging port of the water discharging cylinder in the interior of the frame;
a thermosensitive portion configured to support the valve body; and
a disk spring provided between the valve body and the thermosensitive portion, wherein
a set screw configured to be coupled to the thermosensitive portion is provided below the valve body,
the set screw includes a head portion for forming a gap for clamping the disk spring between the valve body and an opposing surface on the side of the thermosensitive portion opposing the valve body,
a depression allowing insertion of the head portion of the set screw and having a gap which allows an inclining action of the head portion of the set screw at the time of a dismantling operation with respect to the head portion is provided at a bottom portion of the valve body opposing the head portion of the set screw,
the disk spring is formed with a through hole at the center thereof, and the disk spring is held by inserting the set screw coupled to the thermosensitive portion into the through hole, and
the through hole of the disk spring is formed such that a smallest diameter of the through hole is the same as or slightly larger than the outer diameter of the head portion of the set screw, the head portion of the set screw having a smooth outer peripheral surface.
2. The sprinkler head according to claim 1 , wherein the set screw includes a head portion and a leg portion, and
the head portion is formed to be taller in height than the height of arrangement of the disk spring held by the set screw.
3. The sprinkler head according to claim 1 , wherein the disk spring includes a portion formed on an outer peripheral portion for receiving a load and a deflecting portion formed on an inner peripheral portion thereof.
4. The sprinkler head according to claim 1 , wherein the disk spring includes a plurality of slits extending radially from the through hole as a center.
5. The sprinkler head according to claim 4 , wherein the disk spring includes through holes that are triangular and formed into an arcuate shape at the corners thereof, the through holes being provided between adjacent ones of the slits.
6. The sprinkler head according to claim 1 , wherein the head portion of the set screw is formed into an end chamfered shape or a curved surface shape.
7. The sprinkler head according to claim 1 , wherein the disk spring has a shape protruding from the center side with respect to the outer peripheral portion, and is arranged with the surface on the protruding side facing the thermosensitive portion.