JP5629398B1 - Sprinkler head - Google Patents

Abstract

An element for identifying the cause of operation of a sprinkler head is provided, and a sprinkler head capable of maintaining the function of the element over a long period of time is provided. A low melting point alloy having a melting point lower than the operating temperature of a heat sensitive operating part is installed on the surface of a sprinkler head. In order to identify the cause of the operation of the sprinkler head, it is possible to know whether it is due to normal operation or abnormal operation by observing the state of the low melting point alloy 4. [Selection] Figure 3

Description

  The present invention relates to a fire extinguishing sprinkler head.

  The sprinkler head is installed on the ceiling or wall surface of the room, operates by the heat of the fire, discharges water from the internal nozzle, and extinguishes the fire.

  As an example of a conventional sprinkler head, there is a sprinkler head that uses a glass bulb in a heat-sensitive operating portion (see, for example, Patent Document 1). The glass valve has a structure in which a liquid that vaporizes and expands is sealed in a glass container, and the valve body installed at the outlet of the nozzle of the sprinkler head is supported in a closed state by the glass valve.

  When a fire occurs in the above sprinkler head, the liquid in the glass bulb is vaporized and expanded by the heat of the fire, and the glass container is broken and broken. Then, the valve body that has lost its support is separated from the nozzle and the nozzle is opened. The nozzle is connected to the water supply pipe, and water inside the water supply pipe is discharged from the nozzle to extinguish the fire.

  Since the glass bulb has a simple structure and requires a small number of components for the sprinkler head, it has an advantage of low cost. However, if the glass container is broken by an external impact, the valve body is opened, and there is a risk that water will be discharged even if no fire has occurred.

  Even if an attempt is made to collect the fragments in order to find out the cause of the operation of the glass bulb, the fragments are washed away by the water discharged from the nozzle, so that the collection is difficult. Therefore, it is extremely difficult to determine whether the cause of the operation of the glass bulb is due to an external impact or normal operation due to an increase in ambient temperature.

As one means for solving the above problem, there has been disclosed a technique in which a discoloration chip that changes color at a temperature including the operating temperature of the sprinkler head is used on the outer surface of the sprinkler head (see JP-A-8-98899).

JP-A-9-201427 JP-A-8-98899

  Since the sprinkler head is installed in a building such as a building, its function must be maintained while the building is in use. The sprinkler head varies depending on the use environment, but it is desirable to replace it for about 20 years. On the other hand, the effective life of the color changing tip is generally about 5 years, which is shorter than the installation period of the sprinkler head, and there is a possibility that the cause of operation of the glass bulb cannot be proved with the color changing tip that has passed the expiration date. Also, if it is installed for a long period of time, the discolored chip installed on the outer surface of the sprinkler head may fall off for some reason and be lost.

The present invention has been made against the background of the prior art as described above. The object is to provide a sprinkler head in which an element for identifying the cause of operation of the sprinkler head is installed, and the function of this element can be maintained over a long period of time.

  In order to achieve the above object, the present invention provides the following sprinkler head.

  That is, the present invention includes a main body having a nozzle that is connected at one end to a fire extinguishing equipment piping for a fire extinguishing liquid, a valve body that closes the other end of the nozzle, and one end that is engaged with the main body and the other end is a valve A sprinkler head comprising a heat-sensitive operation part that supports the heat-sensitive operation part is provided with a low melting point alloy having a melting point lower than a set temperature at which the heat-sensitive operation part operates on the surface of the main body.

  By installing a low-melting-point alloy having a melting point lower than the operating temperature of the heat-sensitive operating unit in the main body of the sprinkler head, the operating cause of the heat-sensitive operating unit can be specified according to the trace of melting of the low-melting-point alloy. Further, the low melting point alloy can be installed by melting it and soldering to a metal part (for example, a main body, a deflector, etc.) constituting the sprinkler head. In this way, an intermetallic compound is generated between the low melting point alloy and the metal part, and this intermetallic compound can increase the bonding strength of the low melting point alloy to the metal part. Can be installed in. In soldering, the molten low melting point alloy can be bonded to the surface of the metal part of the sprinkler head using a flux material.

  When the low melting point alloy is filled in a hole-shaped or groove-shaped recess formed on the surface of the metal component of the main body, it is possible to prevent external force from being directly applied to the low melting point alloy. In addition, the bonding area between the low melting point alloy and the metal part of the sprinkler head can be increased by filling the recess such as a hole or a groove rather than bonding the low melting point alloy on the plane. And since the effect | action of an external force can be blocked | prevented and a joining area can be enlarged, dropout of a low melting-point alloy can be prevented and the function can be maintained over a long period of time.

  When a protective film is provided on the surface of the low melting point alloy, oxidation and corrosion of the low melting point alloy can be prevented. Therefore, the function of the low melting point alloy can be maintained more reliably over a long period of time.

The main body of the sprinkler head includes an arm extending in the extinguishing liquid discharge direction from the other end side of the nozzle and a deflector installed on the tip side of the arm, and the low melting point alloy is provided on at least one of them. be able to. Note that the low melting point alloy can be provided as a component of a main body that is usually provided for a general sprinkler head, or a dedicated component for installing the low melting point alloy can be added to the main body of the sprinkler head.

According to the present invention, by using a low-melting-point alloy as an element for specifying the cause of the operation of the sprinkler head, a sprinkler head that can maintain the function of the element over a long period of time can be realized.

The front view of the sprinkler head by one Embodiment of this invention. The top view of FIG. XX sectional drawing of FIG. The exploded sectional view of a valve element, a holder, and an elastic member. The system diagram of the sprinkler equipment piping in which the sprinkler head of FIG. 1 was installed. The top view equivalent to FIG. 2 which shows the modification which installs a low melting-point alloy in the notch of the outer periphery of a deflector.

  Hereinafter, embodiments of the sprinkler head of the present invention will be described with reference to the drawings.

  The sprinkler head 100 includes a main body 1, a valve body 2, a heat sensitive operation unit 3, and a low melting point alloy 4.

  The main body 1 is cylindrical and has a nozzle 11 inside. A male screw 12 is formed outside the main body 1, and the male screw 12 is screwed with a female screw of the fire extinguishing equipment pipe P. A valve seat 13 is formed at the discharge side end portion 11 a of the nozzle 11. The valve seat 13 is formed as a recess 13 that is recessed on the nozzle 11 side, and includes a bottom surface 13a and an inner peripheral surface 13b.

  The main body 1 is provided with two arms 14 and 14 that are curved and extend in the discharge direction of the fire extinguishing water discharged from the nozzle 11 from the vicinity of the valve seat 13. The arms 14 and 14 are connected on an extension of the central axis of the nozzle 11, and the connecting portion is a boss 15. The boss 15 has a female screw 16 formed on the central axis of the nozzle 11. The female screw 16 is screwed with a set screw 17 having no head.

  A disc-shaped deflector 18 is installed at the tip of the boss 15. A claw that is continuous in a wavy shape is formed on the peripheral edge 18 a of the deflector 18.

  The valve body 2 has a disk shape, and a sealing material 21 is provided on the surface on the nozzle 11 side. In the present embodiment, a sealing material 21 made of a fluororesin sheet is attached to the valve body 2 with an adhesive, and is configured integrally with the valve body 2.

  A step portion 22 and a hole portion 23 are formed on the opposite side of the surface on which the sealing material 21 is installed. An elastic member 27 is placed on the stepped portion 22. A hole 23 is formed in the surface of the stepped portion 22, and a convex portion 42 of the holder 4 described later is inserted into the hole 23.

  The holder 24 has a disk shape and is installed between the valve body 2 and the heat-sensitive operation unit 3. On the surface of the holder 24 on the valve body 2 side, a convex portion 25 inserted through the hole 23 of the valve body 2 is formed. In FIG. 3, the convex portion 25 is inserted into the hole 23, and the movable gap 6 is provided between the tip of the convex portion 25 and the bottom surface of the hole 23.

  On the opposite surface of the convex portion 25, a seat portion 26 that supports the heat-sensitive operating portion 3 is formed. The seat portion 26 is formed as an inclined surface or a curved shape capable of supporting the inclined surface formed on the surface of the heat-sensitive operating unit 3. The holder 24 has a hole 26 </ b> A penetrating from the seat portion 26 to the end of the convex portion 25. One end side of the heat-sensitive operation unit 3 is inserted and accommodated in the hole 26A.

  The elastic member 27 is a disc spring and has a function of pressing the valve body 2 toward the nozzle 11 and pressing the holder 24 toward the heat-sensitive operation unit 3. A load is applied to the elastic member 27 by the set screw 17. That is, when the set screw 17 is screwed in the direction of the nozzle 11, the elastic member 27 is pressed and elastically deformed from the tip of the set screw 17 via the heat-sensitive operation unit 3 and the holder 24, and is not completely crushed. The movable gap 6 is crushed by a predetermined pressure that remains. Since the elastic member 27 is in such a crushed state, it is possible to obtain a state in which a closing load is applied to the valve body 2 and the discharge side end portion 11a of the nozzle 11 is closed by the valve body 2.

  Even if the fire extinguishing liquid filled in the fire extinguishing equipment pipe P exceeds the closing load of the valve body 2 due to abnormal temperature rise in the summer or freezing of the fire extinguishing liquid in the winter, The displacement of the valve body 2 can be absorbed by the elastic member 27 being elastically displaced in the range of the movable gap 6. For this reason, even if the valve body 2 is displaced, an excessive force does not act on the heat-sensitive operation unit 3, and the malfunction can be avoided.

Further, since the disc spring constituting the elastic member 27 is small in size, there is an advantage that it can be easily incorporated into the sprinkler head 100 and can be elastically deformed with a large load. Specifically, when the pressure receiving area of the valve body 2 is 1 cm ² and the load at which the disc spring 27 is displaced is set to about 500 N, the disc spring 27 is elastic when the water pressure in the nozzle 11 reaches approximately 5 MPa. By deforming, the valve body 2 can be separated from the valve seat 13 and the fire extinguishing liquid in the nozzle 11 can escape to the outside.

  The heat-sensitive operation unit 3 is a glass bulb, and a liquid 32 that evaporates and expands in a glass container 31. Alcohol is generally used for the liquid 32. The liquid 32 is vaporized and expanded by the heat of the fire, and the glass container 31 is broken to operate.

  The low melting point alloy 4 is an alloy having a melting point of 40 to 100 ° C. For example, wood metal (bismuth 50%, lead 26.7%, tin 13.3%, cadmium 10%) and ternary alloys of tin-bismuth-indium are known.

  The melting temperature of the low melting point alloy 4 is, for example, the low melting point alloy 4 having a melting point of 55 ° C. to 70 ° C. when the set temperature at which the thermosensitive operating unit 3 operates is 72 ° C. Further, when the set temperature at which the thermosensitive operating unit 3 operates is 100 ° C., for example, the low melting point alloy 4 having a melting point of 80 ° C. to 95 ° C. is used.

In this way, the low melting point alloy 4 having a melting point lower than the set temperature of the thermal decomposition section 3 is used because the normal operating range of the glass bulb is -5% to + 15% with respect to the set temperature in accordance with the related laws and regulations of fire fighting. This is because it is allowed in the range, and even in the case of operating at a temperature lower than the set temperature, if it is within the above range, normal operation is performed. Therefore, even when the glass bulb 3 is operated at a temperature lower than the set temperature, it can be determined that the operation is due to heat due to the trace of melting of the low melting point alloy 4 having a low melting point.

  The low melting point alloy 4 is preferably installed on the surface of the main body 1 or the deflector 18. This is because the valve body 2 and the heat sensitive operation part 3 may be washed away by the water discharged from the nozzle 11 when the sprinkler head 100 is operated and may not be recovered. However, if it can collect | recover, it can also provide in the valve body 2. FIG.

  The low melting point alloy 4 of this embodiment is filled in the groove 41 as a “recessed portion” formed in the deflector 18 as shown in FIGS. 2 and 3. The low melting point alloy 4 is filled in the groove 41 while being heated and melted. When the material of the deflector 18 is a copper alloy, an intermetallic compound is formed at the boundary between the low melting point alloy 4 and the deflector 18 to increase the bonding strength.

  Further, by housing the low melting point alloy 4 in the groove 41, it is possible to make a configuration in which an external force is not directly applied to the low melting point alloy 4 when an object hits the sprinkler head 100. Furthermore, since the low melting point alloy 4 is accommodated in the groove 41, it can be made inconspicuous from the outside.

Description of the operation of the sprinkler head 100 [FIG. 4]
Subsequently, the operation of the sprinkler head 100 according to the present embodiment will be described.

Operation at the time of fire: The normal operation sprinkler head 100 is installed near the ceiling or under the roof as shown in FIG. When a fire breaks out, the air heated by the heat of the fire rises and stays near the ceiling or under the roof. Heat is also transmitted to the heat-sensitive operation part 3 and the low melting point alloy 4 of the sprinkler head 100 by the warmed air.

  Since the melting point of the low melting point alloy 4 is lower than the set temperature at which the thermosensitive operating unit 3 operates, the low melting point alloy 4 melts prior to the operation of the thermosensitive operating unit 3. The molten low melting point alloy 4 flows out of the groove 41 and leaves its trace.

  Following the melting of the low melting point alloy 4, the liquid 32 enclosed in the heat-sensitive operation unit 3 is vaporized and expanded to break the glass container 31, and the glass container 31 becomes a broken piece and scatters outside the sprinkler head 100.

  The valve body 2 supported on the nozzle 11 side by the heat-sensitive operation unit 3 is not supported by the operation of the heat-sensitive operation unit 3, and the discharge side end of the nozzle 11 is caused by the pressure of water filled in the nozzle 11. The nozzle 11 is opened away from the portion 11a.

  After confirming that the fire is extinguished, the control valve SV is manually closed to stop water discharge from the sprinkler head 100. When the low melting point alloy 4 of the sprinkler head 100 that has been operated or the sprinkler head 100 that is installed around the sprinkler head 100 is observed, a trace of melting in the low melting point alloy 4 is observed. it can.

When the heat-sensitive operating unit 3 is damaged by an external force, when the heat-sensitive operating unit 3 is damaged by hitting the sprinkler head 100 installed on the operating ceiling, the glass container 31 is broken and the valve body 2 is the discharge side end of the nozzle 11. Leave 11a. The nozzle 11 is opened and water is sprayed into the room. In this case, since no fire has occurred, the control valve SV is manually closed to stop water discharge from the sprinkler head 100.

  When the low-melting point alloy 4 of the sprinkler head 100 that has been operated or the sprinkler head 100 that is installed around the sprinkler head 100 is observed, no trace of melting is seen in the low-melting point alloy 4. It can be determined that the heat-sensitive operating unit 3 has been damaged due to the cause and has been activated.

If the sprinkler head 100 is left in the interior of a car in the summer when the operating air temperature increases due to an increase in the ambient temperature, the sprinkler head 100 may be activated due to a rise in the temperature in the car. In this case, when the low melting point alloy 4 of the sprinkler head 100 that has been actuated or the sprinkler head 100 that is included is observed, traces of melting in the low melting point alloy 4 are observed. I can judge.

Checking the state of the low-melting point alloy 4 at the time of inspection If the low-melting point alloy 4 shows traces of overheating, specifically deformation or swelling, at the time of inspection, there is a risk that the sprinkler head 100 will be discharged due to a malfunction, so the sprinkler head 100 is replaced with a new one. It is desirable to replace it. Thus, even when the low melting point alloy 4 is melted and does not flow from the groove 41, the state can be visually recognized by deformation, swelling, or the like.

Modification of Embodiment [FIG. 6]

In the above-described embodiment, the glass bulb is exemplified as the heat-sensitive operation unit 3, but as an alternative, the heat-sensitive operation unit 3 in which a low melting point alloy or a resin is incorporated can be used. For example, those described in JP-A-11-123250, JP-A-2010-263929, and JP-A-2002-78814 can be used. These heat-sensitive operation parts 3 are decomposed | disassembled because a low melting-point alloy and resin melt | dissolve with the heat of a fire.
As described above, the heat-sensitive operating part 3 using the low-melting-point alloy is a case where the low-melting-point alloy is deformed by a creep phenomenon when the ambient temperature rises to near the melting temperature of the low-melting-point alloy, and the heat-sensitive operating part 3 is activated in a non-fire. There is. Also in this case, by confirming the melting of the low melting point alloy 4, the maximum ambient temperature of the sprinkler head defined by the fire fighting standards (when the operating temperature of the sprinkler head is 72 ° C: 38 ° C) is exceeded. It is possible to prove that the increase in temperature is the cause of the operation.

  In the above embodiment, the low melting point alloy 4 is provided in the groove 41 of the deflector 18. However, for example, as shown in FIG. 6, the thread-like low melting point alloy 4 is inserted into a hole or notch drilled in the deflector 18. The low melting point alloy 4 can be fixedly installed on the deflector 18 by crushing and deforming both ends.

  In the above embodiment, an example is shown in which the deflector 18 is provided with four grooves 41 and the low melting point alloy 4 having the same melting point is provided. However, the low melting point alloy 4 having a different melting point for each groove 41 can be installed in the sprinkler head 100. . For example, some of the low melting point alloys 4 of the four grooves 41 are those having a melting point higher than the maximum ambient temperature of the sprinkler head 100, and the low melting point alloys 4 of the remaining grooves 41 are heat sensitive as described above. The one having a melting point lower than the set temperature of the decomposition unit 3 is used. Thus, by observing the molten state of the two types of low melting point alloys 4, it is possible to determine how much the ambient temperature of the sprinkler head 100 was. Three or more low melting point alloys 4 having different melting points may be used.

  Although the example which provides the low melting-point alloy 4 in the deflector 18 was shown in the said embodiment, in addition to the deflector 18, the one or more low melting-point alloys 4 can also be provided in the main body 1. FIG. Further, one or more low melting point alloys 4 may be provided in the main body 1 instead of the deflector 18.

About the low melting-point alloy 4 of the said embodiment, if a protective film is applied to the surface, oxidation can be prevented. Oil, grease, wax, or the like may be applied to the surface as a protective coating, a fluororesin coating may be applied, or a thin resin sheet may be attached to the surface of the low melting point alloy 4 to cover it. As a result, the function of the low melting point alloy 4 can be more reliably maintained over a long period of time.

DESCRIPTION OF SYMBOLS 100 Sprinkler head 1 Main body 11 Nozzle 11a Emission side end 12 Male screw 13 Valve seat 13a Bottom surface 13b Inner peripheral surface 14 Arm 15 Boss 16 Female screw 17 Set screw 18 Deflector 18a Peripheral part 2 Valve body 21 Sealing material 22 Step part 23 Hole Part 24 holder 25 convex part 26 seat part 26A hole 27 projectile 3 heat-sensitive operation part 31 glass container 32 liquid 4 low melting point alloy 41 groove (concave part)
5 Elastic member bullet 6 Movable gap P Fire extinguishing equipment piping SV Control valve

Claims (5)

A main body having a nozzle connected to the fire extinguishing equipment piping of the fire extinguishing liquid on one end side;
A valve body for closing the other end of the nozzle;
In a sprinkler head provided with a heat-sensitive operation part that is engaged with the main body at one end side and supports the valve body at the other end side,
A sprinkler head, comprising: a low melting point alloy having a melting point lower than a set temperature at which the heat-sensitive operation unit operates; and a hole-shaped or groove-shaped recess filled with the low-melting point alloy on a surface of the main body.
A main body having a nozzle connected to the fire extinguishing equipment piping of the fire extinguishing liquid on one end side;
A valve body for closing the other end of the nozzle;
In a sprinkler head provided with a heat-sensitive operation part that is engaged with the main body at one end side and supports the valve body at the other end side,
A low melting point alloy having a melting point lower than a set temperature at which the thermosensitive operating part operates is provided on the surface of the main body, and the low melting point alloy is installed by being engaged with a hole drilled in the surface of the main body. And sprinkler head.
A main body having a nozzle connected to the fire extinguishing equipment piping of the fire extinguishing liquid on one end side;
A valve body for closing the other end of the nozzle;
In a sprinkler head provided with a heat-sensitive operation part that is engaged with the main body at one end side and supports the valve body at the other end side,
A sprinkler head comprising a low melting point alloy having a melting point lower than a set temperature at which a thermosensitive operating part operates on a surface of a main body, and a protective film is provided on the surface of the low melting point alloy.
The sprinkler head according to any one of claims 1 to 3, wherein the main body includes an arm extending in a fire-extinguishing liquid discharge direction from the other end side of the nozzle and a deflector installed on the tip end side of the arm.
The sprinkler head according to any one of claims 1 to 4, wherein the heat-sensitive operation unit is a glass bulb.

Images