JP2004243032A - Closed head for fire extinguishment and assembling method for heat sensitive body used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surely operating closed head for fire extinguishment preventing intrusion of contamination and development of corrosion products. <P>SOLUTION: This closed head 1 for the fire extinguishment is provided with a head body connected to a fire pipe for pressure feeding fire extinguishing liquid or water, a valve body retaining the cutoff of the opening part 5 of the head body, and a heat sensitive body 20 retaining/releasing the cutoff state of the valve body 6. The heat sensitive body 20 comprises a bottom opening type cylinder 21 and a piston 24, the piston 24 is disposed inside the cylinder 21 with intervention of a fusible piece 23, the fusible piece 23 is provided with a fusion clearance 25 between the cylinder 21 and the piston 24, and the clearance 25 between the cylinder 21 and the piston 24 is filled with grease 30. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a closed fire extinguishing head that extinguishes a fire by spraying a fire extinguishing solution or the like when a fire occurs, and more particularly, a fusible piece that is provided with a cylinder and a piston and that is melted by heat at the time of a fire, resulting in a heat sensitive element Relates to a closed fire extinguishing head that opens a valve body and sprays a fire extinguishing liquid or the like to extinguish a fire.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as one of the structures of a closed head for fire extinguishing, for example, there is a head described in Patent Document 1. In such a head, a gap is provided between the cylinder and the piston for eluting the fusible pieces, so that the fusible pieces dissolved by heat are easy to flow out.On the other hand, dust enters the gap. It is conceivable that the fusible pieces may not flow out in the event of a fire, or a corrosion product may be generated to close the gap and prevent the cylinder from sliding. When this occurs, a serious problem occurs in that the head does not operate during a fire. However, it is difficult to confirm and remove such dust and corrosion products while being installed on the ceiling.
As a method for preventing such accumulation and corrosion of dust on the cylinder and piston, for example, a method of applying a water-repellent coating to the whole or a part of the head, such as the head described in Patent Document 2, has been devised. .
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 2-3233 (pages 1-3, Fig. 3)
[Patent Document 2]
JP-A-2001-327621 (3, 4 pages, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, when such a method of applying a water-repellent coating is applied to a head having the structure of Patent Document 1, the gap where the fusible pieces flow out is covered with the coating, and the head cannot be operated unless the coating is cut off during operation. However, if the film is covered with a thin film so that it can be easily cut, corrosive gas will enter the gap when exposed to a corrosive atmosphere, accumulating corrosion products inside the film, and may hinder the operation of the head. is there. For this reason, it is difficult to use a method of applying a water-repellent coating to a head having a structure using a fusible piece of Patent Document 1.
[0005]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a closed fire extinguishing head that prevents intrusion of dust and generation of corrosion products and operates reliably.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a head body connected to a fire extinguishing pipe through which a fire extinguishing liquid or water is pumped, a valve body that keeps an opening of the head body watertight, and a water stoppage of the valve body. In a fire-extinguishing closed head having a heat-sensitive body for holding and releasing a state, the heat-sensitive body comprises a cylinder and a piston having a downwardly open shape, and the piston is disposed inside the cylinder with a fusible piece interposed therebetween. A gap is provided between the cylinder and the piston so that the soluble pieces can elute, and the gap between the cylinder and the piston is filled with grease.
[0007]
Further, the present invention is characterized in that an extension is formed at the lower end of the gap between the piston and the cylinder.
[0008]
Further, the present invention is characterized in that the extended portion of the gap is formed by annularly notching the lower end portion of the outer periphery of the piston and the inner periphery of the cylinder.
[0009]
Further, the present invention is characterized in that the grease is an inactive grease.
[0010]
The present invention also provides a method for assembling a heat-sensing body for a closed fire extinguishing head, comprising a cylinder having a lower opening and a piston, wherein the piston is disposed inside the cylinder with a fusible piece interposed therebetween. After the piston is inserted from below, the gap formed between the inner periphery of the cylinder and the outer periphery of the piston is filled with grease.
[0011]
The present invention also relates to a method for assembling a heat-sensing body for a closed fire extinguishing head, comprising a cylinder having a lower opening and a piston, wherein the piston is disposed inside the cylinder with a fusible piece interposed.
After applying grease to the inner surface of the cylinder or the surface of the piston that contacts the fusible piece, the fusible piece is attached to the cylinder, and the piston is inserted into the cylinder from below.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, the most common sprinkler head among the closed fire extinguishing heads will be described as an example. Hereinafter, the first embodiment will be described first. FIG. 1 is a cross-sectional view of a sprinkler head according to a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view around a heat sensitive body, and FIGS. 3 to 5 respectively show first to third assembling methods of the heat sensitive body. FIG.
[0013]
The sprinkler head 1 according to the present embodiment has a head main body 2 and a body 3. At the upper part of the head main body 2, a connection screw portion 4 is provided for connection to a fire extinguishing pipe for feeding a fire extinguishing liquid, and an inflow passage 5 is formed inside the connection screw portion 4. In a state where the body 3 is screwed and fixed to the head main body 2, a valve piston 6 as a valve body integrally provided with a deflector 7 is provided. The valve piston 6 is arranged at a position where the opening of the inflow path 5 is closed, and is sealed by an O-ring 41. A deflector 7 is integrally formed on the tip side of the shaft portion 6a of the valve piston 6. The deflector 7 includes a plurality of arm-shaped members radially divided around a shaft portion 6 a, and a stopper 15 is integrally formed on the outer peripheral side of the arm member, and a biasing member as an urging member is provided between the stopper 15 and the head main body 2. A coil spring 42 is incorporated.
[0014]
On the opening 14 side of the body 3, a heat-sensitive operating section 8 is provided. The heat-sensitive operating portion 8 includes a slider 10, a balancer 11, a ball 12, and a heat-sensitive body 20, and is fixed to the body 3 with the valve piston 6 held in a closed state as shown.
A ball receiver 13 is formed on the slider 10, and the ball 12 is stored in the ball receiver 13 as shown in the left half of FIG. 1. The ball 12 abuts against the positioned balancer 11 and the opening 14 of the body 3, whereby the ball 12 supports and fixes the balancer 11 and the heat sensitive body 20 to the body 3 via the slider 10.
[0015]
Here, the heat-sensitive body 20 of the heat-sensitive operating section 8 includes a cylindrical cylinder 21 having a lower opening, heat collecting plates 22 formed on the outer periphery of the cylinder 21, and a donut-shaped fusible piece disposed inside the cylinder 21. The slider 10 and the balancer 11 are prepared in advance as an assembly having a piston 23 and a piston 24. The slider 10 and the balancer 11 are mounted on the body 3 via the ball 12, and are fixed by set bolts 43.
[0016]
The piston 24 is inserted into the cylinder 21 from below with a fusible piece 23 interposed therebetween, and a shaft portion 24a of the piston 24 penetrates substantially the center of the fusible piece 23 and the cylinder 21. In a normal state, the fusible piece 23 is sandwiched between the piston 24 and the cylinder 21, and a force is applied in a direction to crush the fusible piece 23. Further, between the inner periphery of the cylindrical cylinder 21 and the outer periphery of the piston 24, there is provided a uniform annular gap 25 through which the fusible pieces 23 melted by heat at the time of fire can flow out. In the event of a fire, the sprinkler head 1 operates by the fusible pieces 23 flowing out of the gap 25.
[0017]
Here, the gap 25 is filled with grease 30, as shown in FIG. As described above, by filling the gap 25 provided between the cylinder 21 and the piston 24 with the grease 30, it is possible to prevent dust from entering the gap 25 and to prevent generation of corrosion products. On the other hand, in the event of a fire, the fusible pieces 23 melted by heat flow from above into the gap 25 and flow out together with the grease 30, so that the grease 30 does not prevent the fusible pieces 23 from flowing out, and the sprinkler head 1 operates reliably. I do. It should be noted that even if the grease 30 is filled in the gap 25 somewhat excessively, the operation of the sprinkler head 1 will not be hindered. Further, since it also has a function as a lubricant, it has an action of smoothly operating the sprinkler head 1.
[0018]
Further, the grease 30 is also applied to the sliding hole 21a of the cylinder 21 through which the shaft portion 24a of the piston 24 passes (not shown). Thereby, the sliding of the cylinder 21 when the sprinkler head 1 operates becomes smoother.
As such grease 30, it is desirable to use inert grease such as fluorine-based grease or silicon grease. Such inert grease hardly solidifies over time, so it does not stick to the gap 25, and its properties hardly change even when the environmental temperature changes due to heat at the time of fire. There is no hindrance to the operation of the head 1. Examples of the inert grease include a fluorine-based grease using a fluorine-based base oil and a tetrafluoroethylene resin as a thickener.
[0019]
Next, the operation of the sprinkler head 1 will be described. In a normal state, the valve piston 6 is connected to a fire-extinguishing pipe for pumping out the fire-extinguishing liquid in a state where the inflow path 5 of the head body 2 is closed. Sometimes, the fusible piece 23 of the heat sensitive body 20 is melted, and the distance between the cylinder 21 and the piston 24 is reduced, so that the fusible piece 23 is pushed out and flows out together with the grease 30 from the gap 25 provided between the cylinder 21 and the piston 24. Thus, the balancer 11 moves down together with the cylinder 21.
For this reason, the support of the ball 12 is lost, the heat-sensitive operating part 8 is disassembled, and the slider 10, the balancer 11, and the heat-sensitive body 20 fall off. As a result, the closed support of the inflow passage 5 by the valve piston 6 is released, and the valve piston 6 and the deflector 7 fall due to the hydraulic pressure of the fire extinguishing liquid applied to the inflow passage 5 and the force of the coil spring 42, and the inflow Open Road 5 and discharge fire extinguishing liquid.
The deflector 7 that has fallen downwards contacts the corner of the inner edge of the opening 14 of the body 3 with the stopper 15, exposing the deflector 7 downward from the opening 14 of the body 3 and discharging the deflector 7 from the inflow path 5. Spray fire extinguishing liquid around the fire extinguishing liquid.
[0020]
Finally, a method of assembling the heat-sensitive element 20 used in such a sprinkler head 1 will be described. 3 to 5 show first to third assembling methods of the thermal element 20, respectively. In FIGS. 3 to 5, the heat collecting plates 22 are omitted.
As a first assembling method of the heat sensitive body 20, as shown in FIG. 3, a fusible piece 23 is attached to a cylinder 21, and then a piston 24 is inserted into the cylinder 21 from below to complete the heat sensitive body 20, This is a method in which the grease 30 is filled in the gap 25 of the thermosensitive body 20 completed as described above.
[0021]
As a second assembling method of the heat sensitive body 20, as shown in FIG. 4, a method of applying grease 30 to the inner surface of a cylinder 21 and inserting a piston 24 having a fusible piece 23 attached to the cylinder 21 from below. It is. In this case, the grease 30 applied to the inner surface of the cylinder 21 is sandwiched between the cylinder 21 and the fusible piece 23 by pushing the piston 24 to which the fusible piece 23 is attached, and the grease 30 is moved in the side direction to fill the gap 25 with the grease 30. I do. The grease 30 may be applied to the inner side surface of the cylinder 21 from the beginning.
[0022]
As a third method of assembling the heat sensitive body 20, as shown in FIG. 5, a fusible piece 23 is attached to a cylinder 21, while a grease 30 is applied to a surface of the piston 24 facing the fusible piece 23. This is a method of inserting into the cylinder 21 from below. In this case, by pushing the piston 24 against the cylinder 21, the grease 30 applied to the piston 24 is sandwiched between the piston 24 and the fusible piece 23, the grease 30 is moved in the side direction, and the gap 25 is filled with the grease 30. The grease 30 may be applied to the side surface of the piston 24 from the beginning.
It should be noted that such a difference in the assembling method is a problem of which assembling method is easy to introduce in performing the work, and the heat-sensitive body 20 has the same effect even if any assembling method is used.
[0023]
The first embodiment has been described above. Next, a second embodiment will be described. FIG. 6 is an enlarged cross-sectional view around the heat-sensitive element according to the second embodiment, and FIG. 7 is a view illustrating a method of assembling the heat-sensitive element. The overall structure of the sprinkler head 1 according to the present embodiment is substantially the same as the structure of the sprinkler head 1 according to the first embodiment, and a description thereof will be omitted.
As shown in FIG. 6, the thermal element 20 in the present embodiment has an annular extension 25a at the lower end of an annular gap 25 formed between the cylinder 21 and the piston 24. That is, a portion facing the lower end portion of the outer periphery of the piston 24 and the lower end portion of the piston 24 on the inner periphery of the cylinder 21 are cut out in an annular shape to form an extended portion 25a.
By forming the extended portion 25a at the lower end of the gap 25 in this way, for example, as shown in FIG. 7, when the grease 30 is filled after assembling the heat sensitive body 20, the grease 30 can be easily filled. The grease 30 can be more reliably filled in the entire gap 25.
[0024]
Here, the case where the grease 30 is filled after assembling the heat sensitive body 20 has been described. However, even when such an extended portion 25a is formed in the gap 25, the heat sensitive body 20 is used in the first embodiment. As in the second and third assembling methods described above, it is of course possible to apply grease 30 first and then assemble.
Further, in FIG. 6, the shape of the expanded portion 25a is a square cross section, but is not particularly limited to this, and may be any shape such as a triangular cross section or a semicircular cross section.
[0025]
Next, a third embodiment will be described. FIG. 8 is an enlarged cross-sectional view around the heat-sensitive body in the third embodiment. The overall structure of the sprinkler head 1 and the method of assembling the thermal element 20 in the present embodiment are substantially the same as those in the second embodiment, and a description thereof will be omitted.
As shown in FIG. 8, the heat sensitive body 20 in this embodiment is formed such that the lower surface of the cylinder 21 and the lower surface of the piston 24 are substantially flush with each other, and an annular gap formed between the cylinder 21 and the piston 24. An annular expansion portion 25a is formed at the lower end of 25. That is, the lower end of the outer periphery of the piston 24 and the lower end of the inner periphery of the cylinder 21 are cut off in an annular shape to form the extended portion 25a.
With such a configuration, the grease 30 can be easily filled, and even when the grease 30 that has been excessively filled overflows from the gap 25 when the grease 30 is filled, the lower surfaces of the cylinder 21 and the piston 24 Is almost flush, excess grease can be easily wiped off with a towel or the like.
[0026]
The embodiment of the invention has been described. In the present embodiment, the sprinkler head has been described as an example, but the present invention is not limited to this, and can be applied to other types of heads such as a closed type foam head. The present invention is also applicable to a head using an existing donut-type fusible piece. In addition, the present invention can be applied by applying grease to the elution port as long as the fusible piece is sandwiched and the fusible piece is melted from the elution port in the event of a fire.
[0027]
【The invention's effect】
As described above, according to the present invention, the heat-sensitive body is constituted by a cylinder and a piston having a lower opening, and the piston is disposed inside the cylinder with a fusible piece interposed therebetween, and the fusible piece can elute between the cylinder and the piston. Since the gap between the cylinder and the piston is filled with grease, dust can be prevented from entering the gap, and the generation of corrosion products due to the corrosive atmosphere can be prevented. As a result, a head that operates reliably can be obtained.
[0028]
Further, according to the present invention, the extended portion is formed at the lower end of the gap between the piston and the cylinder, so that the gap can be reliably filled with grease.
[0029]
Further, according to the present invention, since the extended portion of the gap is formed by annularly notching the lower end portion of the outer periphery of the piston and the inner periphery of the cylinder, it is possible to reliably fill the entire gap with grease.
[0030]
Further, according to the present invention, since the grease is an inert grease, the grease does not stick to the gap, and the property does not change even when the environmental temperature changes, so that the grease hinders the operation of the head. Not even.
[Brief description of the drawings]
FIG. 1 is a sectional view of a sprinkler head according to a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view around a heat sensitive body according to the first embodiment.
FIG. 3 is a view showing a first assembling method of a heat sensitive body.
FIG. 4 is a view showing a second method of assembling the heat-sensitive element.
FIG. 5 is a view showing a third assembling method of the heat sensitive body.
FIG. 6 is an enlarged cross-sectional view around a heat sensitive body according to a second embodiment.
FIG. 7 is a view showing a method of assembling a heat sensitive body.
FIG. 8 is an enlarged cross-sectional view around a heat sensitive body according to a third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Head main body 3 Body 5 Inflow path 6 Valve piston 7 Deflector 8 Heat sensitive operation part 10 Slider 11 Balancer 12 Ball 13 Ball receiver 14 Opening 20 Heat sensitive body 21 Cylinder 21a Sliding hole 22 Heat collecting plate 23 Meltable piece 24 Piston 24a Shaft 25 Gap 25a Extension 30 Grease

Claims (6)

A head body connected to a fire extinguishing pipe through which a fire extinguishing liquid or water is pumped, a valve body for holding and stopping the opening of the head body, and a heat-sensitive body for holding and releasing the water stopping state of the valve body. Fire-extinguishing closed head,
The heat-sensitive body comprises a lower opening cylinder and a piston, and the piston is disposed inside the cylinder with a fusible piece interposed, and has a gap between the cylinder and the piston where the fusible piece can elute. A closed fire extinguishing head characterized in that a gap between the cylinder and the piston is filled with grease. 2. A closed fire extinguishing head according to claim 1, wherein an extension is formed at a lower end of a gap between said piston and said cylinder. 3. The closed fire extinguishing head according to claim 2, wherein the extended portion of the gap is formed by annularly notching a lower end portion of the outer periphery of the piston and / or an inner periphery of the cylinder. The fire-extinguishing closed head according to any one of claims 1 to 3, wherein the grease is inert grease. A method for assembling a thermosensitive body of a fire-extinguishing closed-type head, comprising a lower-opening cylinder and a piston, wherein the piston is disposed inside the cylinder with a fusible piece interposed therebetween.
A fire-extinguishing closed-type head, comprising: mounting a fusible piece inside the cylinder; inserting the piston from below; and filling a gap formed between an inner circumference of the cylinder and an outer circumference of the piston with grease. How to assemble the heat sensitive body. A method for assembling a heat-sensing body for a fire-extinguishing closed-type head, comprising a lower-opening cylinder and a piston, wherein the piston is disposed inside the cylinder with a fusible piece interposed therebetween,
After applying grease to the inner surface of the cylinder or the surface of the piston that comes into contact with the fusible piece, the fusible piece is attached to the cylinder, and the piston is inserted into the cylinder from below. How to assemble the heat sensitive body.

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