JPH0737638Y2 - Guard for sprinkler head - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a guard for protecting a sprinkler head for extinguishing a fire mounted on a ceiling.

[Prior Art] Since the sprinkler head is exposed from the ceiling surface, it is easy to encounter an external impact. In other words, if a person carrying a long object passes through the room to which the sprinkler head is attached, it will hit the sprinkler head.

The sprinkler head holds the valve of the nozzle at the disassembled part that is decomposed by the heat of fire, but when the decomposed part is exposed to an external impact, it explodes and sprays water, or it deforms even if it does not occur. There was an accident that caused water to leak.

Therefore, it has been customary to attach a guard that protects the sprinkler head from external impact.

The conventional guard was attached directly to the sprinkler head, and was composed of a thick wire so as not to interfere with water spray when the sprinkler head was in operation.

By the way, in modern buildings, the importance of the aesthetics of the interior has come to be emphasized, so sprinkler heads that have a large protrusion from the ceiling surface are no longer suitable, and therefore embedded sprinkler heads that have a small protrusion from the ceiling surface and Multi-type sprinkler heads have been widely adopted. These sprinkler heads are not only aesthetically pleasing, but also have the advantage that they are less susceptible to external impact. However, in a recent low-ceiling building, there is a possibility that an accident such as a violent accident or water leakage may occur due to an external impact even if the sprinkler head has a small projection from the ceiling surface.

Therefore, it is becoming common to attach guards to these low-protrusion sprinkler heads.
The guard is also made of thick wire and is directly attached to the sprinkler head.

[Problems to be solved by the invention] The embedded sprinkler head has a structure in which there is almost no protrusion from the ceiling surface and the deflector falls during operation. For this reason, the conventional guard attached to the embedded sprinkler head has a large projection downward so as not to interfere with this fall. However, the features of the embedded sprinkler head are reduced if the guard attached to the embedded sprinkler head itself is not exposed so much.

Even in a multi-type sprinkler head, it is not preferable to cover a aesthetically pleasing head with a poor-looking guard.

Moreover, the conventional guard merely protects the sprinkler head, and the concealing effect is not considered at all. The concealment effect is to conceal a wide gap formed between the hole formed in the ceiling and the sprinkler head. Generally, the gap formed between the hole in the ceiling and the sprinkler head was hidden by attaching a dish-like thing called a sealing plate to the sprinkler head, but if the hole drilling position is misaligned, a larger hole must be opened. Of course, this large hole could not be hidden by the sealing plate, and the hole could be seen from the periphery of the sealing plate, which was unaesthetic.

The present invention does not obstruct the fall of the deflector when the sprinkler head is operated even if it is attached to the embedded sprinkler head in spite of reducing the protrusion from the ceiling surface. It is to provide a sprinkler head guard that can be concealed.

[Means for Solving the Problems] The present inventor uses a low melting point alloy for mounting the guard,
In the event of a fire, we completed the present invention by paying attention to the fact that if the guard falls first before the sprinkler head operates, it will not hinder sprinkling or falling of the deflector at all.

According to the present invention, a mounting body that can be mounted on a ceiling and a lid member that can cover a hole for inserting a sprinkler head, which is formed in the ceiling, are bonded with a low melting point alloy having a melting point lower than the operating temperature of the sprinkler head. In addition, the sprinkler head guard is characterized in that a spring material that acts as a spring in the direction of dropping the lid member is installed between the mounting body and the lid member.

[Operation] Since the low melting point alloy to which the guard is attached is lower than the operating temperature of the sprinkler head, when a fire occurs, the low melting point alloy to which the guard is attached melts first and drops the guard, and then the sprinkler head operates.

If the low melting point alloy with the guard attached melts, the guard will fall by its own weight, but if a spring is installed at the guard attachment part, the guard will fall completely due to the spring force.

[Embodiment] The guard is composed of an attachment body 1, a spring member 2, a lid member 3, and a low melting point alloy 4.

The mounting body 1 has an annular shape, and a plurality of projecting portions 5 are formed on the periphery thereof, and a hole 6 through which a wood screw can be inserted is formed therein. The mounting body includes a plurality of L-shaped legs 7 ...
Is installed. The legs 7 are made of a material to which the low melting point alloy 4 can be soldered. The low melting point alloy has a melting point lower than the operating temperature of the sprinkler head,
For example, if the sprinkler head operates at 72 ° C, the low melting point alloy should have a lower melting point of about 65 ° C. The spring member 2 is a disc spring having substantially the same size as that of the mounting body 1, and has notches 8 ... Where the legs of the mounting body 1 coincide.

The lid member 3 has a concave shape, and a flange 9 having substantially the same size as the mounting body 1 is formed around the upper portion. Since the flange is joined to the leg 7 of the mounting body 1 with a low melting point alloy,
It must be a material that can be soldered, but it may be a material that can be soldered only to the joints of the legs. Further, a plurality of openings 10 ... Are opened around the lid member.

To assemble the guard, the leg 7 of the mounting body 1 is put in the notch 8 of the spring member 2, the leg 7 is placed on the flange 9 of the lid member 3, and then the leg 7 and the flange 9 are bonded with the low melting point alloy 4. .

The guard assembled in this manner is attached so as to be substantially concentric with the hole 13 of the ceiling 12 to which the sprinkler head 11 is attached. As for the mounting, wood screws 14 are passed through the holes 6 of the mounting body 1 and directly mounted on the ceiling 12.

If the guard is installed so as to be approximately concentric with the hole 13 in the ceiling,
As shown in the figure, even if the hole in the ceiling is too large than the sprinkler head, or the position of the hole is displaced from the sprinkler head and cannot be completely covered with the sealing plate, it can be hidden by the guard.

Next, the operation of the guard of the present invention will be described.

When a fire occurs, the guard is heated by the heat of the fire, and the low melting point alloy 4 that adheres the mounting body 1 and the lid member 3 melts. At this time, since the spring force acts on the lid member to drop the lid member, the lid member is completely dropped by the spring force in addition to the own weight of the lid member. The heat of the fire enters the guard through the opening 10 of the lid member 3 and heats the sprinkler head 11 before the low melting point alloy 4 of the guard melts. At this time, the low-melting-point alloy 4 is lower than the operating temperature of the sprinkler head, and since this joint is below the sprinkler head, that is, near the fire, the sprinkler head operates before the lid member 3 falls. There is no such thing. The reason for allowing the heat of the fire to enter the guard before the lid member falls is to accelerate the operation of the sprinkler head. That is, if the heat of the fire cannot penetrate into the guard and the sprinkler head is heated after the lid member falls, the actuation of the sprinkler head will be delayed and the fire will be enlarged. In the embodiment, the lid member is provided with an opening for allowing the heat of the fire to enter the guard, but the opening is not limited to the opening of the lid member as long as the heat of the fire can enter the guard. For example, the space between the mounting body and the lid member may be opened, and heat may be introduced into the interior from here.

Further, although the disc spring is shown as the spring material in the embodiment, a spiral spring, a leaf spring or the like can be adopted as long as the lid member can be biased by the spring. Furthermore, the joining state of the mounting body and the lid member is shown by a method in which the legs of the mounting body and the flanges of the lid member are bonded by a low melting point alloy, but the mounting body and the lid member are held by the low melting point alloy. It goes without saying that any structure can be adopted as long as it has the above structure.

[Advantage of the Invention] The sprinkler head guard of the present invention does not cause any trouble in spraying the fire extinguishing liquid on the sprinkler head because the lid member drops first before the sprinkler head is activated, and it can also be used as an embedded sprinkler head. On the other hand, even if a lid member with little protrusion is used, it does not interfere with the fall of the deflector. Moreover, since the sprinkler head guard of the present invention can be directly attached to the ceiling and can cover the entire hole drilled in the ceiling, it has the aesthetic effect of being able to completely hide even large holes that cannot be hidden by the ceiling plate. .

[Brief description of drawings]

FIG. 1 is a view for explaining a state in which the sprinkler head guard of the present invention is attached to a ceiling surface, and FIG. 2 is an exploded perspective view of the sprinkler head guard of the present invention. 1 ... Mounting body, 2 ... Spring material, 3 ... Lid member, 4 ...
… Low melting point alloy, 10 …… Opening, 11 …… Sprinkler head, 12 …… Ceiling, 13 …… Ceiling hole

Claims (2)

[Scope of utility model registration request] 1. A mounting member that can be mounted on a ceiling and a lid member that can cover a hole for inserting a sprinkler head formed in the ceiling are bonded with a low melting point alloy having a melting point lower than the operating temperature of the sprinkler head. A guard for a sprinkler head, characterized in that a spring material that acts as a spring in the direction of dropping the lid member is installed between the mounting body and the lid member. 2. The guard for a sprinkler head according to claim 1, wherein the lid member is provided with an opening for allowing heat of a fire to penetrate into the guard.