JP2003062113A - Water cut-off structure for sprinkler head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cut-off structure for a sprinkler head the inside of a nozzle and a water cut-off member are chemically changed like corrosion, melting on the like due to chemical components contained in water in the piping of sprinkler extinguishing equipment. SOLUTION: In the water cut-off structure of the nozzle portion of a close sprinkler head, a seal material consisting of elastic material covering a nozzle inner wall and the face on the nozzle side of a valve in the state of closely fitting a nozzle exit periphery and a valve, is installed. The seal material has a structure of breaking a valve abutting face when the valve of the sprinkler head is opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water blocking structure for a nozzle portion of a closed type sprinkler head.

[0002]

2. Description of the Related Art As a conventional waterproof structure of a nozzle portion of a closed type sprinkler head, there is a structure using a metal packing or an O ring.

The one using the former metal packing is
Using a packing made of a soft metal material such as copper, sharply form the nozzle outlet edge, press the nozzle outlet edge against the packing, apply a load, and let the tip of the sharp part bite into the packing and stop. It's watering.

The latter one using the O-ring is one in which the O-ring is installed on the inner surface of the nozzle or on the valve body side, and the O-ring is widely used as a water leakage preventing member for valves, stoppers and the like.

[0005]

However, when the pipes and joint members are welded when connecting the pipes of the sprinkler fire extinguishing equipment, the flux used for welding may remain in the pipes. If water is introduced without removing it, the chemical components of the flux will begin to dissolve in water.

Metal packings and O-rings, which are water-stopping structures of conventional closed type sprinkler heads, chemically change due to the flux components contained in the water in the above-mentioned pipes, and the packings or the nozzle outlet periphery corrode, or There was a problem that the O-ring melted and water leaked from the sprinkler head.

Therefore, an object of the present invention is to provide a water-stop structure of a sprinkler head in which chemical changes such as corrosion and melting do not occur in the nozzle and the water-stop member due to the chemical components contained in the water in the pipe.

[0008]

In order to achieve the above object, in the invention according to claim 1, in a water blocking structure of a nozzle portion of a closed type sprinkler head, a nozzle outlet peripheral edge and a valve body are in close contact with each other. In this state, a sealing material made of an elastic material is installed to cover the inner wall of the nozzle and the surface of the valve body on the nozzle side.

According to a second aspect of the present invention, the sealing material according to the first aspect is formed by coating a liquid sealing material inside the nozzle in a state where the nozzle outlet peripheral edge and the valve body are in close contact with each other. is there.

According to a third aspect of the present invention, the sealing material according to the first aspect is fitted and installed in the nozzle after the sealing material is formed.

According to a fourth aspect of the present invention, the sealing material according to the first aspect has a structure in which the valve element contact surface is broken when the valve element of the sprinkler head is opened.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a sprinkler head incorporating the water blocking structure of the present invention. Figure 2
Is a cross-sectional view of the sealing material 5A. FIG. 3 is a sectional view of a sprinkler head incorporating the sealing material of FIG. FIG. 4 shows the shape of the nozzle contact surface of the sealing material.

The sprinkler head of FIG.
It is composed of a deflector 2, a valve body 3, and a thermosensitive decomposition section 4. The main body 1 is a male screw 11 connected to a pipe (not shown).
Is internally screwed and has a nozzle 12 inside for discharging the fire extinguishing liquid sent from the pipe, and the nozzle 12 is tapered from the inlet to the outlet.

Two arms 14 and 14 extend in a curved manner on the upper part of the main body, and the tips of the arms 14 and 14 are connected to a boss 15. A female screw is screwed inside the boss 15, and a set screw 16 is screwed into the boss 15 to press the heat-sensitive decomposition portion 4 and maintain the balance of the force of the heat-sensitive decomposition portion 4.

The deflector 2 is disk-shaped, and has claws 21 formed over the entire circumference of the peripheral edge, and the claws 21 ... Are bent downward from the horizontal. The deflector 2 is fixed to the upper part of the boss 15 and uniformly sprays the fire-extinguishing liquid discharged from the nozzle onto the floor surface.

The valve body 3 closes the outlet of the nozzle 12 of the main body 1, and the thermosensitive decomposition part 4 is incorporated in the upper part of the valve body 3,
By screwing the set screw 16 into the female screw of the boss 15, it is pressed by the heat-sensitive decomposition unit 4 to close the nozzle 12.

The thermal decomposition section 4 has the same structure as a conventional sprinkler head, for example, the thermal decomposition section described in Japanese Utility Model Publication No. 42-16553, and is well known to those skilled in the art. Is omitted.

In the above-described sprinkler head, in order to prevent leakage from the nozzle 12, a bottomed cylindrical seal material 5 having a water-stop structure of the present invention is provided from the bottom side of the nozzle 1.
Insert from the inlet side of 2 and attach it to the inner surface of the nozzle.

As a means for mounting the sealing material 5 on the inner surface of the nozzle, it is possible to form the sealing material 5 by adhering the sealing material 5 to the inner surface of the nozzle or by coating a liquid sealing material on the inner surface of the nozzle and drying it. Is.

Alternatively, as shown in FIG. 2, the sealing material 5A
A flange portion 51 is formed on the peripheral edge portion of, and the peripheral edge of the flange portion 51 is formed so as to stand upright.

The sealing material 5A having the above structure is inserted into the nozzle 12 of the sprinkler head as shown in FIG. The flange portion 51 of the seal material 5A is projected to the outside of the nozzle 12, and the upright portion of the flange portion 51 covers the male screw 11 of the main body 1.

When the above-mentioned sprinkler head is connected to the pipe, the collar portion of the seal material 5A is sandwiched between the male screw 11 and the female thread of the female thread on the pipe side which is screwed with the male screw 11, and the seal material 5A is fixed. To be done. After that, when the pipe is filled with the extinguishing liquid, the sealing material 5A is pressed against the inner surface of the nozzle by the liquid pressure of the extinguishing liquid, and the sealing material 5A and the inner surface of the nozzle are brought into close contact with each other.

As the material of the sealing material, rubber or synthetic resin can be considered, but it is preferable to use fluororesin which is excellent in chemical reaction resistance.

When the heat-sensitive decomposition section 4 of the sprinkler head is disassembled in the event of a fire and the valve body 3 is opened,
The sealing material 5 is broken by the water pressure of the fire extinguishing liquid, and the nozzle 1
Fire extinguishing liquid in the pipe must be discharged from 2, but
At this time, in order to make the sealing material 5 easy to tear, the sealing material 5
A part of the valve body contact surface may be formed thin.

Specifically, as shown in FIG. 4 (a), a cross-shaped thin portion is formed on the valve body contacting surface of the sealing material 5, or as shown in FIG. 4 (b), a star-shaped portion is formed. You may form a thin part.

Although the above-mentioned embodiments have been described with respect to the frame type sprinkler head, the same can be applied to the flash type and multi type sprinkler heads.

[0027]

As described above, according to the present invention, even if the water in the pipe contains a chemical component, the inner surface of the nozzle and the side surface of the nozzle of the valve body are covered with the sealing material, so that corrosion or the like occurs. It is a water-stop structure of the sprinkler head that does not cause chemical changes.

[Brief description of drawings]

FIG. 1 is a sectional view of a sprinkler head incorporating a water blocking structure of the present invention.

FIG. 2 is a sectional view of a sealing material 5A.

FIG. 3 is a sectional view of a sprinkler head incorporating the sealing material of FIG.

[Fig. 4] Nozzle contact surface shape of sealing material

[Explanation of symbols]

1 body 2 deflector 3 valve body 4 Thermal decomposition part 5 Seal material 11 male screw 12 nozzles 14 arms 15 Boss 16 setscrews 21 nails 51 Tsuba

Claims (4)

[Claims] 1. A watertight structure for a nozzle portion of a closed-type sprinkler head, wherein a sealing material made of an elastic material covers an inner wall of the nozzle and a nozzle side surface of the valve body in a state where a nozzle outlet peripheral edge and a valve body are in close contact with each other. The water-stop structure of the sprinkler head is characterized by the installation of the. 2. The sprinkler head according to claim 1, wherein the sealing material is formed by coating a liquid sealing material in the nozzle in a state where the peripheral edge of the nozzle and the valve body are in close contact with each other. Water-stop structure. 3. A water blocking structure for a sprinkler head, wherein the sealing material according to claim 1 is fitted and installed in a nozzle after the sealing material is formed. 4. The water blocking structure for a sprinkler head, wherein the sealing material according to claim 1 has a structure in which a valve body contact surface is broken when the valve body of the sprinkler head is opened.