JP2576320Y2 - Sprinkler head - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sprinkler head, and more particularly, to a compression piston for pressing a fusible alloy of a flash sprinkler head.

[0002]

2. Description of the Related Art In a flash sprinkler head,
When the fusible alloy melts due to the occurrence of a fire, the link mechanism is thermally decomposed, the valve body falls, and water discharge is started. This fusible alloy is housed in a bottomed cylinder with a heat-sensitive plate, and is pressed by a piston rod via a compression piston.

[0003]

In the event of a fire, the link mechanism cannot be rapidly decomposed unless the fusible alloy is uniformly melted. Therefore, the entire surface of the fusible alloy is pressed uniformly using a cylindrical compression piston.

However, when such a columnar compression piston is used, the mass of the piston increases, and heat exchange with the fusible alloy increases, so that heat loss increases. Therefore, the melting of the fusible alloy is delayed, and the disassembly of the link mechanism is delayed, so that the initial fire extinguishing is difficult.

In order to solve this problem, it is conceivable to use a plate-shaped compression piston. This piston has a smaller heat loss because it has a smaller mass than the cylindrical one, but the piston may tilt when the fusible alloy starts melting. Therefore, the piston does not slide smoothly, and the thermal decomposition of the link mechanism is delayed.
Initial fire fighting becomes difficult.

The present invention has been made in view of the above circumstances, and aims to reduce the heat loss of a fusible alloy and to allow a compression piston to slide smoothly.

[0007]

According to the present invention, a sprinkler head in which a fusible alloy and a compression piston are sequentially inserted into a bottomed cylinder with a heat-sensitive plate and the compression piston is pressed by a piston rod, wherein the compression piston is A bottom surface portion in contact with the surface of the fusible alloy and an inside standing upright on the bottom surface portion
A sprinkler head characterized by comprising a cylindrical guide portion forming a space portion in the sprinkler head.

[0008]

[Action] When the fusible alloy melts due to the occurrence of a fire, the guide portion of the compression piston is guided to the cover holding cylinder,
The bottom surface slides smoothly while being guided by the bottomed cylinder. Further, since the compression piston has a smaller mass than a conventional cylindrical piston, the heat loss of the fusible alloy is small.

[0009]

An embodiment of the present invention will be described with reference to the accompanying drawings. A heat-sensitive plate 18 is provided on the outer peripheral surface of the bottomed cylinder 19, and a cover holding cylinder 22 for holding the heat-sensitive plate cover 18b is fitted to the upper end thereof. As shown in FIG. 5, the cover holding cylinder 22 has a small diameter portion 22a.
And a large diameter portion 22b.

The bottomed cylinder 19 is made of brass, and the holding cylinder 22 is made of stainless steel having a lower thermal conductivity than the cylinder 19. It is made of steel. This is to prevent the heat of the bottomed cylinder 19 from escaping to the cover holding cylinder 22. A cylindrical fusible alloy 20 and a compression piston 21 are sequentially inserted into the bottomed cylinder 19, and the piston 21 is pressed by the piston rod 15.

The compression piston 21 has a bottom surface 21a in full contact with the surface 20a of the fusible alloy 20, and a bottom surface 21a.
And a cylindrical guide portion 21b standing upright.

The diameter D of the bottom portion 21a is formed larger than the diameter d of the guide portion 21b as shown in FIG. The bottom portion 21 a slides while being guided by the bottomed cylinder 19, and the guide portion 21 b slides while being guided by the cover holding cylinder 22.

The inner surface 21c of the bottom portion 21a is formed in a mortar shape, and a matching hole 50 is formed at the vertex thereof. The distal end 15a of the piston rod 15 supported by the link mechanism 51 is in pressure contact with the fitting hole 50. The outer peripheral surface 15S of the piston rod 15 and the inner peripheral surface 22 of the cylinder 22
d, between the inner peripheral surface 21d of the compression piston 21 and FIG.
A space 60 is formed as shown in FIG. The space 60
The upper part is wider than the lower part so that the hot air flow can easily flow in.

The link mechanism 51 is a link mechanism for pressing and closing the valve body 5 against the water discharge port, and is configured as follows. That is, the balancer 12 is disposed on the lower surface of the cover plate of the arm guide 11, and a fulcrum receiving groove for supporting the projection 5 c of the valve element 5 is formed in the center of the balancer 12. The balancer 12 is supported at the tops of a pair of arms 13 having engagement portions suspended from the load adjustment slits of the cylindrical frame 4.

A link holding plate 14 supporting the arms 13 is fixed to an upper end of a piston rod 15, and a lower end of the arms 13 is held by an arm supporting plate 23.

1 is a head body having a water discharge channel 2;
Reference numeral 3 denotes a flange for attaching the water outlet and the cylindrical frame 4, 7 denotes a sealing member for sealing between the valve body 5 and the water outlet, and 10 denotes a connecting rod 9 of a deflector 8 that slides and falls in the cylindrical frame 4.
And a stopper ring attached to the upper end edge of each of them.

Next, the operation of this embodiment will be described. When a hot air stream is generated by the fire, the hot air stream A20 heats the heat-sensitive plate 18 and melts the fusible alloy 20 as shown in FIG. 5, but the surface 20a of the fusible alloy 20 Since it is pressed uniformly by the bottom surface 21a, it is almost uniformly melted.

At this time, the hot air flow A60 enters a space 60 formed between the inner peripheral surface 22d of the cover holding cylinder 22 and the inner peripheral surface 21d of the guide portion of the compression piston 21 and the piston rod 15, and the compression piston 21 and the piston Warm rod 15. Therefore, the heat loss of the fusible alloy 20 is reduced, so that the fusible alloy 20 melts at an early stage of a fire.

When the fusible alloy 20 is melted, the compression piston 2
1 slides while being guided by the bottomed cylinder 19 and the cover holding cylinder 22. Due to the sliding of the compression piston 21, the link mechanism 51 is disassembled.

By the thermal decomposition of the link mechanism 51, the valve element 5 moves away from the water outlet, and the deflector 8 slides downward. Fire extinguishing water discharged from the water outlet collides with the deflector 8 and scatters. Water is sprinkled in a predetermined direction while the direction is adjusted.

The embodiment of the present invention is not limited to the above. For example, when the bottomed cylinder 19 and the cover pressing cylinder 22 have the same diameter, as shown in FIG. And the diameter of the guide portion 21b may be the same.

[0022]

[Effect of the Invention] Since the present invention is configured as described above, the mass of the compression piston is smaller than that of the conventional example, the heat loss of the fusible alloy is reduced, and the compression piston slides while being guided by the guide portion. Therefore, the piston operates smoothly. For this reason, the sprinkler head operates at the early stage of the fire, so that the initial fire can be extinguished.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view.

FIG. 3 is an enlarged view of the compression piston of FIG. 1;

FIG. 4 is a longitudinal sectional view showing an embodiment of another compression piston.
FIG. 4 is a diagram corresponding to FIG. 3.

FIG. 5 is an enlarged view of a main part of FIG. 1;

[Explanation of symbols]

 Reference Signs List 18 heat-sensitive plate 19 bottomed cylinder 20 fusible alloy 20a fusible alloy surface 21 compression piston 21a bottom part

Claims (4)

(57) [Scope of request for utility model registration] 1. A sprinkler head for sequentially inserting a fusible alloy and a compression piston into a bottomed cylinder with a heat-sensitive plate, and pressing the compression piston with a piston rod, wherein the compression piston contacts the surface of the fusible alloy. A sprinkler head comprising: a bottom surface portion in contact with the tube ; and a cylindrical guide portion rising from the bottom surface portion to form a space therein. 2. The sprinkler head according to claim 1, wherein the diameter of the bottom portion is larger than the diameter of the guide portion. 3. The sprinkler head according to claim 1, wherein the diameter of the bottom portion is the same as the diameter of the guide portion. 4. The sprinkler head according to claim 1, wherein a matching groove is formed at the center of the inner surface of the bottom portion.