JP2011115334A - Jet head and gas fire extinguishing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet head capable of reducing the noise based on the supply of fire extinguishing gas, and to provide a gas fire extinguishing system equipped with the same. <P>SOLUTION: The jet head 41, connected to the outflow port of supply piping 22c for supplying the fire extinguishing gas into a target chamber to eject the fire extinguishing gas flowing through the supply piping 22c. The jet head includes: a first gas passage 61 also used as expansion chambers 63, 64 and 65 through which the fire extinguishing gas supplied from the outflow port of the supply piping 22c flows; and a second gas passage 62 also used as expansion chambers 68 and 69, wherein the jet head is further provided with the gas jet port 66 communicating with the first gas passage 61 and the gas jet port 70 communicating with the second gas passage 62, on the front walls 45 being the respective closed ends of the leading ends of the respective gas passages 61 and 62. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a fire extinguishing gas ejection head and a gas fire extinguishing system including the same.

Conventionally, as a gas fire extinguishing system that extinguishes a fire generated in a target room, there is a system that fills a target room with a fire extinguishing gas composed of an inert gas or a non-flammable gas such as nitrogen gas, carbon dioxide gas, and halogen gas (for example, Patent Document 1). Such a gas fire extinguishing system is particularly effective for extinguishing fire in a target room in which precision equipment such as a large computer and a server that are vulnerable to water and chemical extinguishing agents are installed.
In this gas fire extinguishing system, the outlet opening in the target chamber is made into a nozzle shape with a narrowed cross section so that a large amount of fire extinguishing gas can be filled in the target chamber in a short time. High-pressure fire extinguishing gas is ejected from the outlet at high speed.

JP 2000-60984 A

However, in the above-described gas fire extinguishing system, since the gas pressure is suddenly released when the high pressure fire extinguishing gas is ejected from the outlet to the target chamber, the fire extinguishing gas rapidly expands, and a very large expansion sound is generated. May occur.
Moreover, in order to fill the target room with fire-extinguishing gas in a short time, the fire-extinguishing gas is ejected from the outlet at high speed, but if this ejection flow velocity partially exceeds the speed of sound, a shock wave is generated. Noise may occur.

  Therefore, the present invention has been made in view of such circumstances, and provides an ejection head capable of reducing noise based on the supply of a fire extinguishing gas, and a gas fire extinguishing system including the same. Objective.

In order to solve the above problems, the present invention employs the following means.
The invention according to claim 1 is an ejection head that is connected to an outlet of a gas pipe for supplying a fire-extinguishing gas into a target chamber and ejects the fire-extinguishing gas that flows through the gas pipe. A plurality of gas passages that also serve as expansion chambers through which a fire extinguishing gas supplied from an outlet flows are provided, the gas passages of the respective passages are closed at the ends, and gas outlets are provided at the respective closed ends. It is an ejection head.
With this configuration, the fire extinguishing gas flows into the plurality of gas passages in the ejection head from the outlet of the gas pipe when the target room is extinguished. Since each gas passage also serves as an expansion chamber, the fire extinguishing gas flows into the gas passage and expands, and is then ejected from the gas outlet into the target chamber. Thus, after the fire extinguishing gas ejected from the outlet of the gas pipe is once expanded in the ejection head and then ejected from the gas ejection port of the ejection head into the target chamber, when the fire extinguishing gas is released from the gas ejection port Can be reduced.
In addition, since the fire extinguishing gas that has circulated through the gas passages of the plurality of paths is ejected from the gas ejection port provided at the tip of each gas path, without reducing the total flow rate of the fire extinguishing gas ejected into the target chamber, The flow rate of gas ejected from the gas ejection port can be reduced. Thereby, compared with the case where the fire-extinguishing gas is collectively ejected from the nozzle-shaped ejection port as in the prior art, the ejection flow rate of the fire-extinguishing gas can be reduced, and the ejection flow rate can be made lower than the speed of sound. As a result, generation of shock waves can be prevented, so that no noise is generated due to the shock waves.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the gas passages of the respective paths are provided in a maze shape.
By comprising in this way, the flow path length of each gas passage can be lengthened, and it becomes possible to provide a some expansion chamber in the middle. The more expansion chambers, the greater the effect of reducing expansion noise.

According to a third aspect of the present invention, in the first aspect of the present invention, the closed ends at the ends of the gas passages of the paths are arranged on the same plane, and the gas of two paths arranged adjacent to each other. The passages are characterized by having a difference in flow path length by a half wavelength of the wavelength of the suppression target sound.
By comprising in this way, since the suppression target sounds of the fire extinguishing gas ejected from the gas outlets of the two gas passages arranged adjacent to each other cancel each other, the noise level of the suppression target sound can be reduced. .

The invention according to claim 4 is the gas supply source for storing the fire extinguishing gas, the gas pipe for supplying the fire extinguishing gas from the gas supply source to the target room, and any one of claims 1 to 3. A gas fire extinguishing system, wherein the jet head is attached to an outlet of the gas pipe.
By comprising in this way, noise can be reduced only by attaching an ejection head to the existing gas piping, and it does not accompany a large change of a gas fire extinguishing system. Therefore, the increase in equipment cost can also be suppressed.

According to the ejection head of the present invention, noise based on the supply of fire extinguishing gas can be reduced.
According to the gas fire extinguishing system of the present invention, noise can be reduced only by attaching an ejection head to an existing gas pipe, so that the gas fire extinguishing system is not significantly changed. Therefore, the increase in equipment cost can also be suppressed.

It is a schematic structure figure of a fire extinguishing system in an embodiment of the present invention. It is principal part sectional drawing in 1st Embodiment of this invention. It is principal part sectional drawing in 2nd Embodiment of this invention. It is sectional drawing of gas piping.

Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
(Gas fire extinguishing system)
FIG. 1 is a schematic configuration diagram showing a gas fire extinguishing system.
As shown in FIG. 1, the gas fire extinguishing system 10 of the present embodiment performs fire extinguishing in a target room 12 in which a precision device 11 such as a large computer is installed, and the fire extinguishing system installed outside the target room 12. A gas supply source (gas supply source) 21, a gas pipe 22 that communicates the supply source 21 with the inside of the target chamber 12 and guides the extinguishing gas supplied from the supply source 21 into the target chamber 12, and a fire notification (not shown) And a control unit (not shown) for opening and closing the control valve 23 connected to the gas pipe 22 based on a fire signal output from the vessel.

  The target room 12 of the present embodiment is a so-called double room in which the top plate 15 is arranged with a space between the ceiling 14 and the floor plate 16 is arranged with a space between the floor 13. It has a floor and double ceiling structure. Specifically, a space surrounded by the ceiling 14 and the top board 15 is a ceiling area 17, and a space surrounded by the floor 13 and the floor board 16 is a floor area 18, and a space surrounded by the top board 15 and the floor board 16. The equipment installation area 19 is configured, and the above-described precision equipment 11 is installed on the floor plate 16 of the equipment installation area 19, while various wirings of the precision equipment 11 and air conditioner ducts are provided in the ceiling area 17 and the underfloor area 18. Etc. are arranged. The floor plate 16 and the top plate 15 are not limited to be provided so as to completely block the regions 17 to 19, and are provided so that the regions 17 to 19 communicate with each other as illustrated. Also good.

  The supply source 21 is constituted by a pressure vessel such as a gas cylinder for storing a fire extinguishing gas in a high pressure state, for example. As the fire extinguishing gas, for example, nitrogen gas, carbon dioxide gas, halogen gas, or the like can be used as an inert gas or a nonflammable gas. In this embodiment, nitrogen gas is suitably used.

The gas pipe 22 is branched into a plurality of portions in the middle from the gas supply source 21 to the target chamber 12, whereby a plurality (three in the illustrated example) of outlets of the gas pipe 22 are opened in the target chamber 12. is doing. The plurality of outlets are preferably arranged at positions separated from each other so that the target room 12 can be filled with the fire extinguishing gas in a shorter time.
In the present embodiment, the gas pipe 22 is connected to a supply pipe 22a connected to the supply source 21, a plurality of branch pipes 22b branched at the downstream end of the supply pipe 22a, and a downstream end of each branch pipe 22b. And a plurality of ejection pipes 22 c that open from the side wall 25 of the target room 12 into the ceiling region 17, the device installation region 19, and the underfloor region 18. Although the control valve 23 of this embodiment is connected to the supply piping 22a which is the backbone of the gas piping 22, it is not limited to this and may be connected to the branch piping 22b and the ejection piping 22c.

  Further, the side wall 27 facing the side wall 25 of the device installation area 19 is opened when the pressure in the target chamber 12 becomes equal to or higher than a predetermined pressure, and gas (fire extinguishing gas or air) filling the target chamber 12 is filled. A pressure-reducing opening damper 26 for escaping to the outside of the target chamber 12 is installed. In this way, by arranging the pressure relief damper 26 at a position facing the ejection pipe 22c from which the fire extinguishing gas is ejected, the entire target chamber 12 can be easily filled with the fire extinguishing gas.

FIG. 2 is a cross-sectional view of a main part of the first embodiment. Since the downstream side of each ejection pipe 22c has the same configuration, the downstream side of one ejection pipe 22c will be described in the following description.
As shown in FIG. 2, a nozzle (outlet) 31 having a reduced cross section is attached to the downstream end of each ejection pipe 22c in order to accelerate the flow of the fire-extinguishing gas ejected from the ejection pipe 22c. The nozzle 31 extends along the axial direction of the ejection pipe 22c (the flow direction of the fire extinguishing gas).

(Jet head)
An ejection head 41 for ejecting fire extinguishing gas into the target chamber 12 is attached to the downstream end of the nozzle 31. The ejection head 41 includes a cylindrical connecting portion 42 that is connected so as to cover the downstream end of the nozzle 31 from the outside, and a head main body 43 that is connected to the downstream end of the connecting portion 42.

  The head main body 43 has a rectangular parallelepiped shape that is enlarged and formed in a direction orthogonal to the gas flow direction with respect to the inner diameter of the nozzle 31, and extends with the axial extension direction of the nozzle 31 as the longitudinal direction. A connecting portion 42 is connected to the center of a wall portion (hereinafter referred to as a rear wall) 44 on the upstream side in the longitudinal direction of the head main body 43.

  Inside the head main body 43, a first partition wall 51 connected to the bottom of the connection portion 42 and opposed to the connection portion 42, and a wall portion on the downstream side in the longitudinal direction of the head main body 43 facing the first partition wall 51 ( A second partition wall 52 disposed between the second partition wall 52 and the front wall 45, and a third partition wall 53 disposed in parallel with the bottom wall 46 of the head body 43. The two gas passages are provided in a labyrinth shape by being partitioned by the partition walls 51, 52, and 53.

  The upper end of the first partition 51 is separated from the upper wall 47 of the head main body 43 and serves as a throttle portion 48 through which a fire extinguishing gas can flow. The upper and lower ends of the second partition wall 52 are also separated from the upper wall 47 and the bottom wall 46 of the head main body 43 and become throttle portions 49 and 50 through which the fire extinguishing gas can flow. The second partition wall 52 has a step-like cross-sectional shape, the upper vertical wall portion 52 a is disposed close to the front wall 45, and the lower vertical wall portion 52 b is disposed close to the first wall portion 51. The lower end of the upper vertical wall portion 52a and the upper end of the lower vertical wall portion 52b are horizontally connected by the base portion 52c.

  The first gas passage 61 includes a first expansion chamber 63 formed by being surrounded by the first partition wall 51, the rear wall 44 and the upper wall 47 of the head body 43, and the upper side of the first partition wall 51 and the second partition wall 52. The second expansion chamber 64 formed by being surrounded by the vertical wall portion 52a, the horizontal wall portion 52c, and the upper wall 47 of the head body 43, the second partition wall 52, the third partition wall 53, and the front wall 45 of the head body 43. The third expansion chamber 65 is formed by being surrounded by the wall 47, and the first expansion chamber 63 and the second expansion chamber 64 communicate with each other via the throttle portion 48. The third expansion chamber 65 communicates with the throttle portion 49. The front end of the first gas passage 61, that is, the front end of the third expansion chamber 65 is closed by the front wall 45, and the front wall 45 is provided with a gas ejection port 66 communicating with the first gas passage 61. .

  The second gas passage 62 is formed by branching from the second expansion chamber 64 in the first gas passage 61 and is formed between the first partition wall 51 and the vertical wall portion 52 b below the second partition wall 52. A gas passage 67, a vertical wall 52b below the first partition 51 and the second partition 52, a fourth expansion chamber 68 surrounded by the bottom wall 46 and the rear wall 44 of the head body 43, A vertical wall portion 52b below the second partition wall 52, a third partition wall 53, a bottom wall 46 of the head body 43, and a fifth expansion chamber 69 formed by being surrounded by the front wall 45, The second expansion chamber 64 and the fourth expansion chamber 68 communicate with each other through the gas passage 67, and the fourth expansion chamber 68 and the fifth expansion chamber 69 communicate with each other through the throttle portion 50. Note that the gas passage 67 functions as a throttle for the second expansion chamber and the fourth expansion chamber. The front end of the second gas passage 62, that is, the front end of the fifth expansion chamber 69 is closed by the front wall 45, and the front wall 45 is provided with a gas outlet 70 that communicates with the second gas passage 62. . In other words, the front wall 45 is provided with a gas outlet 66 communicating with the first gas passage 61 and a gas outlet 70 communicating with the second gas passage 62 side by side.

In the first embodiment, the number of the gas jets 66 connected to the first gas passage 61 and the number of the gas jets 70 connected to the second gas passage 62 are one, respectively. A plurality of them may be provided.
Moreover, although the ejection head 41 of 1st Embodiment may be integrally fixed to the nozzle 31, or may be integrally formed, it is more preferable that it is attached to the nozzle 31 so that attachment or detachment is possible.

(Operation method of gas fire extinguishing system)
Next, the operation | movement method of the gas fire extinguishing system of this embodiment is demonstrated. In addition, the arrow F in FIG. 1 has shown the flow of the fire extinguishing gas.
First, when a fire alarm detects a fire in the target room 12, a fire signal is output from the fire alarm to the control unit. When the control unit receives the fire signal, the control unit starts the gas fire extinguishing system 10. Specifically, the control unit opens the control valve 23 and supplies the fire extinguishing gas from the supply source 21 to the gas pipe 22.

The fire extinguishing gas supplied to the gas pipe 22 is discharged through the nozzle 31 to the first expansion chamber 63 in the first gas passage 61 of the ejection head 41 and expands.
Further, the fire extinguishing gas flows down through the first gas passage 61 and is discharged from the first expansion chamber 63 through the throttle portion 48 to the second expansion chamber 64 to expand.

The fire extinguishing gas that has passed through the second expansion chamber 64 is divided into one that flows down the first gas passage 61 as it is, and one that branches off from the first gas passage 61 and flows down through the second gas passage 62.
The fire extinguishing gas flowing down through the first gas passage 61 as it is is discharged from the second expansion chamber 64 through the throttle 49 to the third expansion chamber 65 and expands. Then, the fire extinguishing gas is jetted into the target chamber 12 from a gas jet port 66 provided in the front wall 45.
As described above, the fire extinguishing gas ejected from the nozzle 31 is expanded in the first gas passage 61 of the ejection head 41 in a plurality of times and then ejected from the gas ejection port 66 into the target chamber 12. The expansion noise generated when the fire extinguishing gas is released from the outlet 66 can be reduced.

On the other hand, the fire extinguishing gas branched from the first gas passage 61 and flowing down the second gas passage 62 is discharged from the second expansion chamber 64 through the gas passage 67 to the fourth expansion chamber 68 and expands.
Further, the fire extinguishing gas flows down through the second gas passage 62 and is discharged from the fourth expansion chamber 68 through the throttle portion 50 to the fifth expansion chamber 69 and expands. The fire extinguishing gas is jetted into the target chamber 12 from the gas jetting port 70 provided on the front wall 45.
As described above, the fire extinguishing gas ejected from the nozzle 31 is expanded in the second gas passage 62 of the ejection head 41 in a plurality of times and then ejected from the gas ejection port 70 into the target chamber 12. The expansion sound generated when the fire extinguishing gas is released from the outlet 70 can be reduced.

  In the first embodiment, since the first gas passage 61 and the second gas passage 62 are formed in a labyrinth, the length of each gas passage 61, 62 is increased, and a plurality of expansion chambers 63, 64, 65 and 68, 69 can be provided, and the effect of reducing expansion noise can be increased.

  Further, the fire extinguishing gas ejected to the ejection head 41 flows through the two gas passages 61 and 62 and is ejected from the gas ejection ports 66 and 70 provided at the distal ends of the gas passages 61 and 62. The flow rate of the gas ejected from each of the gas ejection ports 66 and 70 can be reduced without reducing the total flow rate of the fire extinguishing gas ejected inside. Thereby, compared with the case where the fire-extinguishing gas is collectively ejected from the nozzle-shaped ejection port as in the prior art, the ejection flow rate of the fire-extinguishing gas can be reduced, and the ejection flow rate can be made lower than the speed of sound. As a result, generation of shock waves can be prevented, so that no noise is generated due to the shock waves.

  Since the fire extinguishing gas ejected from the gas ejection ports 66 and 70 diffuses into the target chamber 12, the fire extinguishing gas can be supplied to the entire target chamber 12. Thereafter, the fire in the target chamber 12 can be extinguished by continuing to supply the fire extinguishing gas from the ejection head 41 into the target chamber 12 and filling the target chamber 12 with the fire extinguishing gas. If the extinguishing gas continues to be supplied and the pressure in the target chamber 12 exceeds a predetermined pressure, the pressure relief damper 26 is opened so that the gas in the target chamber 12 automatically escapes to the outside. It has become.

  Thus, according to the first embodiment, as described above, noise caused by expansion when the fire-extinguishing gas is released from the gas ejection ports 66 and 70 can be reduced, and the gas is ejected from the gas ejection port. As a result, it is possible to prevent a shock wave from being generated due to the gas flow velocity, so that noise based on the supply of the fire extinguishing gas can be reduced.

  Moreover, in the gas fire extinguishing system of 1st Embodiment, since the ejection piping 22c is opening to each area | region of the ceiling area | region 17, the underfloor area | region 18, and the apparatus installation area | region 19 in the object chamber 12, fire extinguishing gas is in these several area | regions. Can be filled in a shorter time.

  Moreover, in the gas fire extinguishing system 10 of 1st Embodiment, although fire extinguishing and fire prevention are performed by filling the target room 12 with fire extinguishing gas, the inside of the target room 12 by the fire extinguishing gas supplied in the target room 12 The pressure may increase. Here, since the gas fire extinguishing system of the present embodiment includes the pressure avoidance opening damper 26, excessive pressure can be released outside the target chamber 12. Therefore, it is possible to prevent an increase in pressure in the target room 12 from adversely affecting the building and the precision instrument 11.

  In addition, when the ejection head 41 is configured to be detachable from the nozzle 31, noise can be reduced simply by attaching the ejection head 41 to the existing nozzle 31, resulting in a significant change in the gas fire extinguishing system. There is nothing. Therefore, the increase in equipment cost can also be suppressed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view of a main part of the second embodiment. In the following description, the same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  The ejection head 81 of the second embodiment is also attached to the nozzle 31. As shown in FIG. 3, the head main body 82 of the ejection head 81 of the second embodiment has an enlarged cross section in a direction that communicates with the connecting portion 42 and is perpendicular to the gas flow direction with respect to the connecting portion 42. An expansion chamber 83 is formed, and two gas passages 84 and 85 connected to the expansion chamber 83 are provided side by side on the downstream side. Here, one gas passage 84 is formed in a straight line parallel to the axial extension of the connecting portion 42, and the other gas passage 85 is formed in an arc shape. Hereinafter, the gas passage 84 is referred to as a straight gas passage 84 and the gas passage 85 is referred to as an arc-shaped gas passage 85.

  The leading ends of both gas passages 84 and 85 are closed by the same flat wall portion (hereinafter referred to as a front wall) 86 that forms an end surface on the downstream side in the longitudinal direction of the head main body 82. A gas outlet 87 connected to the gas path 84 and a gas outlet 88 connected to the arc-shaped gas path 85 are provided side by side. The gas outlets 87 and 88 are arranged at the center of the closed end faces of the linear gas passage 84 and the arc-shaped gas passage 85.

  The flow path length of the arc-shaped gas passage 85 is set longer than the flow path length of the straight gas passage 84 by a half wavelength of the wavelength of the suppression target sound. Here, the suppression target sound means a sound having a specific frequency for which the noise level is desired to be reduced.

  In the second embodiment, the expansion chamber 83 and the linear gas passage 84 constitute a first gas passage 91, and the expansion chamber 83 and the arc-shaped gas passage 85 constitute a second gas passage 92. The chamber 83 can be considered as a gas passage common to the first gas passage 91 and the second gas passage 92, and both the first gas passage 91 and the second gas passage 92 also serve as an expansion chamber. It can be called a gas passage. Further, since the flow path length in the expansion chamber 83 in the first gas passage 91 and the flow path length in the expansion chamber 83 in the second gas passage 92 are the same length, the flow of the second gas passage 92 It can be said that the path length is set longer than the channel length of the first gas passage 91 by the half wavelength of the wavelength of the suppression target sound.

In the gas fire extinguishing system according to the second embodiment, the fire extinguishing gas ejected from the nozzle 31 is discharged into the expansion chamber 83 of the ejection head 81 and expands.
The fire extinguishing gas that has expanded in the expansion chamber 83 passes through a straight gas passage 84, which is the first gas passage 91, from the expansion chamber 83 through a gas jet outlet 87 provided in the front wall 86. The substantially half of the remaining flow rate that is ejected into the target chamber 12 passes through the arc-shaped gas passage 85 that is the second gas passage 92 from the expansion chamber 83 to the inside of the target chamber 12 from the gas outlet 88 provided in the front wall 86. Is erupted. In this way, the fire extinguishing gas ejected from the nozzle 31 is once expanded in the expansion chamber 83 of the ejection head 81 and then ejected from the gas ejection ports 87 and 88 into the target chamber 12. The expansion noise generated when the gas is released can be reduced.

  In addition, the fire extinguishing gas ejected to the ejection head 81 flows through the two gas passages 91 and 92 and is ejected from the gas ejection ports 87 and 88 provided at the tips of the gas passages 91 and 92. The flow rate of the gas ejected from the gas ejection ports 87 and 88 can be reduced without reducing the total flow rate of the fire extinguishing gas ejected inside. Thereby, compared with the case where the fire-extinguishing gas is collectively ejected from the nozzle-shaped ejection port as in the prior art, the ejection flow rate of the fire-extinguishing gas can be reduced, and the ejection flow rate can be made lower than the speed of sound. As a result, generation of shock waves can be prevented, so that no noise is generated due to the shock waves.

  Further, since the flow length of the second gas passage 92 is longer than the flow length of the first gas passage 92 by half the wavelength of the sound to be suppressed, the second gas passage 92 was ejected from the two gas ejection ports 87 and 88. The suppression target sounds of the fire extinguishing gas cancel each other, and the noise level of the suppression target sound can be reduced.

  Thus, according to the second embodiment, as described above, noise caused by expansion when the fire-extinguishing gas is released from the gas ejection ports 87 and 88 can be reduced, and the gas is ejected from the gas ejection port. As a result, it is possible to prevent a shock wave from being generated due to the gas flow velocity, so that noise based on the supply of the fire extinguishing gas can be reduced. Furthermore, the noise level of the suppression target sound can be reduced.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, in each of the embodiments described above, the ejection head including the gas passages having two paths has been described. However, the ejection head may include the gas passages having three or more paths. In the case of the ejection head according to the second embodiment, it is preferable to use an even number of paths, and the gas paths of two paths arranged adjacent to each other flow for a half wavelength of the wavelength of the suppression target sound. It is preferable to provide a difference in the path length.

  Further, in the first embodiment, the shape of the first and second gas passages 61 and 62 is not limited to the shape described above, and the shape can be appropriately changed, and the expansion chambers provided in the respective gas passages can be changed. The number is not particularly limited, and may be larger than that of the above-described embodiment. The more expansion chambers, the greater the effect of reducing expansion noise. The shape of the first and second gas passages 91 and 92 in the second embodiment is not limited to the above-described shape, and a difference in flow path length can be provided by a half wavelength of the wavelength of the suppression target sound. If necessary, the shape can be changed as appropriate.

Further, the nozzle 31 may not be provided between the ejection head and the ejection pipe 22c, and the ejection head may be directly connected to the ejection pipe 22c.
Further, in the above-described embodiment, the configuration in which the opening / closing operation of the control valve 23 of the gas fire extinguishing system 10 is controlled by the control unit has been described. However, the present invention is not limited thereto, and the operator can manually open / close the control valve 23. I do not care.

  Further, when a high-speed flow occurs in the gas pipe 22, resonance occurs in the gas pipe 22 itself, and noise may be generated based on this vibration. Therefore, for example, as shown in FIG. 4, a cylindrical sleeve 100 made of a vibration isolating material may be fixed to the outer peripheral surface of the gas pipe 22 (jet pipe 22 c). In addition, although the sleeve 100 of the example of illustration is provided over the inside and outside of the object chamber 12, for example, you may provide only in the area | region which protrudes in the object chamber 12. FIG.

  The sleeve 100 may be made of any material such as a metal material, but is more preferably made of a material having sound absorbing performance such as a resin material such as urethane. In this case, noise generated in the gas pipe 22 and the vicinity thereof can be absorbed.

  The gas fire extinguishing system 10 of the present invention is not limited to the fire extinguishing of the target room 12 divided into the plurality of regions 17 to 19 by the floor plate 16 or the top plate 15, for example, only one region without the floor plate 16 or the top plate 15. This can also be applied to extinguishing the target room 12. Moreover, the gas fire extinguishing system 10 of the present invention is not limited to the fire extinguishing in the target room 12 in which the precision device 11 is arranged, but can be applied to the fire extinguishing of another target room 12 such as a clean room.

10 Gas fire extinguishing system 12 Target room 21 Supply source (gas supply source)
22 Gas piping 31 Nozzle (outlet)
41, 81 ejection head 63, 64, 65, 68, 69, 83 expansion chamber 61, 62, 91, 92 gas passage 45, 86 front wall (closed end)
66, 70, 87, 88 Gas outlet

Claims (4)

An ejection head connected to an outlet of a gas pipe for supplying a fire extinguishing gas into a target room, and ejecting the fire extinguishing gas flowing through the gas pipe;
A plurality of gas passages that also serve as expansion chambers through which the fire-extinguishing gas supplied from the gas pipe outlet is circulated, the ends of the gas passages of the respective passages are closed, and gas outlets are provided at the respective closed ends. A jet head characterized by   The ejection head according to claim 1, wherein the gas passages of the respective passages are provided in a labyrinth shape.   The closed ends at the ends of the gas passages of the paths are arranged on the same plane, and the gas paths of the two paths arranged adjacent to each other have a flow path length corresponding to the half wavelength of the wavelength of the sound to be suppressed. The ejection head according to claim 1, wherein the ejection head has a difference. A gas supply source for storing fire extinguishing gas;
A gas pipe for supplying the fire extinguishing gas from the gas supply source into the target room;
An ejection head according to any one of claims 1 to 3,
The gas fire extinguishing system, wherein the ejection head is attached to an outlet of the gas pipe.

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