Gas fire extinguishing system including spray head and spray head

Abstract

To provide an injection head that can secure head pressure with a simple structure while securing silent property, and to provide a gas firefighting installation including the injection head.SOLUTION: An injection head includes: a cylindrical nozzle connected to piping for supplying a fire-extinguishing gas at a proximal end part and including an orifice on a side of a distal end part; and a silencer mechanism connected on the side of the distal end part of the nozzle. The silencer mechanism includes: a laminate laminated in an axial direction of the nozzle and including a first punching metal and an air permeable plate-like porous body; and an airtight cover for covering the substantially whole surface on an opposite side to the nozzle in the laminate. The fire-extinguishing gas which is supplied to the silencer mechanism from the nozzle is jetted from a peripheral surface of the silencer mechanism.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an injection head for injecting fire extinguishing gas and a gas fire extinguishing facility including the injection head.

Background Art

[0002] In order to suppress the disturbance caused by the sound pressure associated with the ejection of fire extinguishing gas from the injection head in a gas fire extinguishing facility, for example, Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2021-28000) discloses a fire extinguishing gas injection device having an injection head and a sound attenuation means for attenuating the sound generated by the release of fire extinguishing gas from the injection head. In this fire extinguishing gas injection device, the sound attenuation means includes a first sound attenuation member provided on the injection head side and a second sound attenuation member provided on the downstream side of the first sound attenuation member, and each of the first and second sound attenuation members is formed in a flat plate shape and is made of a porous material through which gas can flow.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the injection head of Patent Document 1 has a complex structure and an increased manufacturing cost.

[0005] Therefore, an object of the present invention is to provide an injection head that can ensure sound insulation while having a simple structure and a gas fire extinguishing facility including the injection head.

Means for Solving the Problems

[0006] In order to solve the above-described problems, the present invention provides a cylindrical nozzle that is connected to a pipe for supplying fire extinguishing gas at a base end portion and has an orifice at a tip end portion, and A spray head comprising a sound-dampening mechanism connected to the tip end of the nozzle, The aforementioned sound-dampening mechanism A laminate of a first perforated metal and a breathable plate-shaped porous body is stacked in the axial direction of the nozzle, The laminate includes an airtight cover that covers substantially the entire surface on the side opposite to the nozzle, The fire extinguishing gas supplied from the nozzle to the sound-dampening mechanism is ejected from the circumferential surface of the sound-dampening mechanism. We provide a spray head characterized by the following.

[0007] Furthermore, in the spray head of the present invention, it is preferable that the laminate includes a breathable annular porous body surrounding the outer edge of the first perforated metal, and that the fire extinguishing gas is ejected from the annular porous body to the outside of the spray head.

[0008] Furthermore, in the spray head of the present invention, it is preferable that the plate-shaped porous body has a smaller pore diameter than the annular porous body.

[0009] Furthermore, in the spray head of the present invention, it is preferable that the sound-dampening mechanism has a second perforated metal interposed between the orifice and the laminate.

[0010] Furthermore, in the spray head of the present invention, it is preferable that the first perforated metal has a larger hole diameter than the second perforated metal.

[0011] The present invention also provides a gas fire extinguishing system including the spray head described in any of the above. [Effects of the Invention]

[0012] The spray head of the present invention consists of a nozzle and a sound-dampening mechanism, and the sound-dampening mechanism has a simple structure in which a porous material and perforated metal are laminated together. Furthermore, the combination of the porous material and perforated metal ensures quiet operation while ensuring appropriate head pressure. [Brief explanation of the drawing]

[0013] [Figure 1] This is a schematic diagram of the gas fire extinguishing equipment 1 according to the present embodiment. [Figure 2] This is a perspective view of the injection head 7. [Figure 3] These are the top view, sectional view taken along line A-A, sectional view taken along line B-B, sectional view taken along line C-C, and sectional view taken along line D-D of the injection head 7. [Figure 4] This is an exploded view of the injection head 7.

Mode for Carrying Out the Invention

[0014] Hereinafter, representative embodiments of the injection head and the gas fire extinguishing equipment according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these drawings. Also, since the drawings are for conceptually explaining the present invention, dimensions, ratios, or numbers may be exaggerated or simplified for easy understanding.

[0015] The gas fire extinguishing equipment 1 includes a gas container 3, a pipe 5, and an injection head 7 (see FIG. 1). When a flame is detected within the fire extinguishing target section, the section is closed and fire extinguishing gas (inert gas) is injected from the injection head 7.

[0016] Here, the gas container 3 stores inert gas and supplies the inert gas to the injection head 7 via the pipe 5. The gas is injected from the injection head 7 into the fire extinguishing target section at a pressure of, for example, 4 MPa to 10 MPa.

[0017] The injection head 7 is a member attached to the pipe 5 and includes a nozzle 10 and a sound absorption mechanism 20 (see, for example, FIGS. 2 and 3).

[0018] The nozzle 10 is a cylindrical member made of a metal material such as brass. The nozzle 10 has an engagement mechanism 13 with the pipe 5 at the base end portion 11. Here, the engagement mechanism 13 is a thread groove formed on the inner surface of the nozzle 10 and engages with a thread groove formed on the outer peripheral surface of the tip end portion of the pipe 5. On the tip 12 side of the nozzle 10, an orifice 14 is formed. Here, a porous orifice is provided as the orifice 14, and the diameter of each hole is, for example, 5 mm to 10 mm.

[0019] A silencing mechanism 20 is attached to the tip 12 side (downstream side) of the nozzle 10. For example, as shown in Fig. 3(B), the silencing mechanism 20 includes a laminate 21 of a plate-like porous body 22 and a perforated metal 23 (first perforated metal). The fire extinguishing gas supplied to such a laminate 21 is dispersed and rectified in the plurality of holes of the perforated metal 23 and then introduced into the plate-like porous body 22, where it further disperses and flows. As a result, the pressure of the fire extinguishing gas is also appropriately dispersed, and the sound pressure generated when it jets out from the peripheral surface of the silencing mechanism can be reduced.

[0020] The plate-like porous body 22 is a plate body having air permeability. The plate-like porous body 22 is preferably made of a metal material such as nickel chromium, but may also be made of other materials such as ceramics.

[0021] The mesh coarseness (hole diameter) of the plate-like porous body 22 is, for example, 0.7 mm to 1.2 mm. The thickness of the plate-like porous body 22 is, for example, 5 mm to 15 mm.

[0022] The plate-like porous body 22 has a threaded hole 22A formed along its outer periphery (see Fig. 4). The threaded hole 22A is used to integrally fix the plate-like porous body 22 and the cover 26 with screws.

[0023] The perforated metal 23 is a plate body made of a metal material such as aluminum. The diameter of each hole formed in the perforated metal 23 is larger than the diameter of the holes formed in the perforated metal (second perforated metal) 25 described later (see Figs. 3(D) and (E)), and is, for example, 4 mm to 7 mm. Also, the thickness of the perforated metal 23 is, for example, 5 mm to 15 mm.

[0024] The outer diameter of the perforated metal 23 is smaller than the outer diameter of the plate-shaped porous body 22, and the outer diameter of the plate-shaped porous body 22 is approximately the same as the outer diameter of the annular porous body 24. In other words, the annular porous body 24 surrounds the outer edge of the perforated metal 23.

[0025] The annular porous body 24 is an annular body that has permeability. The annular porous body 24 is preferably made of a metallic material such as nickel-chromium, but may also be made of other materials such as ceramics.

[0026] The annular porous body 24 has a larger pore size (mesh roughness) than the plate-shaped porous body 22. For example, the mesh roughness of the annular porous body 24 is 1.4 mm to 3.0 mm. The reason for employing different mesh coarsenesses for the annular porous body 24 and the plate-shaped porous body 22 is that the fire extinguishing gas, which has passed through multiple holes in the perforated metal 23 and through numerous holes inside the plate-shaped porous body 22, can be introduced into the annular porous body 24 without resistance, thereby further enhancing the dispersion effect of the fire extinguishing gas and thus improving the sound-dampening effect. The thickness of the annular porous body 24 may be approximately the same as the thickness of the perforated metal 23, or it may be slightly thicker.

[0027] The annular porous body 24 has screw holes 24A formed along its outer circumference (see, for example, Figure 3(E)). The screw holes 24A are located in positions corresponding to the screw holes 22A of the plate-shaped porous body 22 (see Figure 4).

[0028] In this embodiment, the laminate 21 includes four units, with the plate-shaped porous body 22, perforated metal 23, and annular porous body 24 described above forming one unit (see, for example, Figure 3(B)). In this regard, increasing the number of units in the laminate 21 increases the ventilation resistance, which may lead to insufficient flow rate of fire extinguishing gas and increased pressure loss. Conversely, decreasing the number of units in the laminate 21 may result in insufficient strength. However, the number of units in the laminate 21 may be determined as appropriate depending on the material and dimensions of the porous material and perforated metal used.

[0029] The sound-dampening mechanism 20 may further include perforated metal 25 (second perforated metal). That is, the perforated metal 25 is interposed between the orifice 14 of the nozzle 10 and the laminate 21, reinforcing the strength of the laminate 21. In this case, two pieces of perforated metal 25 are provided.

[0030] Perforated metal 25 is made from metal materials such as aluminum. The diameter of perforated metal 25 is smaller than the diameter of perforated metal 23, for example, 3.0 mm to 4.0 mm. The thickness of perforated metal 25 is 5mm to 15mm.

[0031] In the laminate 21, the surface furthest from the nozzle 10 (i.e., the downstream side) is covered almost entirely by an airtight cover 26 (see, for example, Figure 3(B)). The cover 26 is made of a metal material such as brass, but may be made of other materials such as resin, as long as it is airtight and has the necessary strength.

[0032] The cover 26 has screw holes 26A formed along its outer circumference (see Figure 4). The screw holes 26A are positioned to correspond to the screw holes 22A of the plate-shaped porous body 22. Therefore, the laminate 21 and the cover 26 are integrated by fastening means such as screws, which causes the fire extinguishing gas to be ejected from the circumferential surface of the sound-dampening mechanism 20. The cover 26 also serves to protect the laminate 21.

[0033] Next, the operation of the gas fire extinguishing system 1 and the spray head 7 will be explained. When the gas fire extinguishing system 1 detects a flame in the area to be extinguished, it closes the area and opens the gas container 3. Fire extinguishing gas is supplied from the gas container 3 to the spray head 7 via the piping 5 and sprayed into the area to be extinguished.

[0034] At this time, in the spray head 7, the fire extinguishing gas flows from the nozzle 10 through the orifice 14 to the sound-dampening mechanism 20. In the sound-dampening mechanism 20, the fire extinguishing gas flows into the laminate 21 through the perforated metal 25. In the laminated body 21, as described above, the fire extinguishing gas is dispersed and rectified in multiple holes of the perforated metal 23, and then further dispersed and flows when introduced into the plate-shaped porous body 22. As a result, the pressure of the fire extinguishing gas is appropriately dispersed, and the sound pressure generated when it is ejected from the circumferential surface of the sound-dampening mechanism can be reduced. Since the downstream surface of the laminate 21 is sealed by the cover 26, the fire extinguishing gas is ejected from the circumferential surface of the laminate 21 through the plate-shaped porous body 22 and the annular porous body 24.

[0035] According to this embodiment, the spray head 7 is composed of a nozzle 10 and a sound-dampening mechanism 20, and the sound-dampening mechanism 20 has a simple structure in which it is a laminate of a plate-shaped porous body 22 and a perforated metal 23. Furthermore, the plate-shaped porous body 22 and the perforated metal 23 appropriately absorb and rectify the fire extinguishing gas, thereby ensuring quiet operation while maintaining an appropriate head pressure.

[0036] Experimental example A prototype spray head was fabricated, and the head pressure and sound pressure were investigated under a specified cylinder pressure. For the prototype injection heads, porous materials manufactured by Fuji Chemical Co., Ltd. (product name: Cellmet; material: nickel-chromium) were used as plate-shaped porous bodies and annular porous bodies. For the plate-shaped porous bodies, a material with 27-33 cells / inch, a pore diameter of 0.8 mm, a specific surface area of ​​2,500, an outer diameter of 120 mm, and a thickness of 10 mm was used. For the annular porous bodies, for example, a material with 11-16 cells / inch, a pore diameter of 1.9 mm, and a specific surface area of ​​1,000 was used. Furthermore, the orifice hole diameter of the spray head was 9.1 mm, and there were 7 holes.

[0037] When the gas cylinder pressure was set to 7.5 MPa, the head pressure was 6.0 MPa and the sound pressure was 96.8 dB. This confirmed that the prototype spray head had sufficient head pressure and quiet operation.

[0038] Furthermore, when the gas cylinder pressure was set to 11.6 MPa, the head pressure was 9.2 MPa and the sound pressure was 107.5 dB. This confirmed that the prototype spray head possessed sufficient pressure resistance.

[0039] Although typical embodiments of the present invention have been described above, the present invention is not limited to these, and various design modifications are possible and are also included in the present invention. [Explanation of Symbols]

[0040] 1. Gas fire extinguishing equipment 3. Gas containers 5 Piping 7. Spray head 10 nozzles 11 Proximal end 12 Tip 14 Orifice 20 Silence mechanism 21 Laminate 22 Plate-shaped porous body 23 Perforated Metal 24 cyclic porous body 25 Perforated Metal 26 Cover

Claims

1. A cylindrical nozzle connected at its base end to a pipe supplying fire extinguishing gas, and having an orifice at its tip, A spray head comprising a sound-dampening mechanism connected to the tip end of the nozzle, The aforementioned sound-dampening mechanism A laminate of a first perforated metal and a breathable plate-shaped porous body is stacked in the axial direction of the nozzle, The laminate includes an airtight cover that covers substantially the entire surface on the side opposite to the nozzle, The fire extinguishing gas supplied from the nozzle to the sound-dampening mechanism is ejected from the circumferential surface of the sound-dampening mechanism. A spray head characterized by the following.

2. The laminate includes a breathable annular porous body surrounding the outer edge of the first perforated metal, The fire extinguishing gas is ejected from the annular porous body to the outside of the spray head. The spray head according to claim 1, characterized by the following:

3. The plate-shaped porous body has a smaller pore diameter than the annular porous body. The spray head according to claim 2, characterized by the following:

4. The sound-dampening mechanism has a second perforated metal interposed between the orifice and the laminate. The spray head according to claim 1, characterized by the following:

5. The first perforated metal has a larger hole diameter than the second perforated metal. The spray head according to claim 4, characterized by the following:

6. A gas fire extinguishing system including a spray head according to any one of claims 1 to 5.

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