Gas fire extinguishing equipment

Abstract

To suppress noise caused by rapid decompression and inflation of fire extinguishing gas.SOLUTION: A gas jetting device includes: a jetting head 13 including a nozzle 12; a sound absorption material 125 into which fire extinguishing gas discharged from the nozzle flows and which is made of a porous metal; a ring member 122 contacting with the sound absorption material to fix the sound absorption material; and a connection member 129 connecting the jetting head with the ring member. The nozzle includes a nozzle hole 16. The sound absorption material includes one edge face 125b from which the fire extinguishing gas is discharged and an other edge face 125a facing an opening of the nozzle hole. The fire extinguishing gas discharged from the nozzle hole can be made to flow directly into the porous metal from the other edge face. The connection member includes a fitting part 123 capable of being screwed onto the jetting head and one edge face thereof opens to air except for a portion contacting with the ring member.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present invention relates to a gas fire extinguishing system that extinguishes a fire by lowering the O2 concentration in a target compartment of a building when a fire occurs by discharging a fire extinguishing gas such as N2 gas or a halide gas as an extinguishing agent into the target compartment of a building, and more specifically, to a gas fire extinguishing system that can be suitably implemented to reduce the loud noise generated when a fire extinguishing gas is sprayed from a spray head provided in the target compartment of a fire. [Background technology]

[0002] Conventionally, various buildings have been equipped with gas fire extinguishing equipment that extinguishes fires by releasing extinguishing gases such as CO2 gas, N2 gas, and halogenated gases into the target compartment as extinguishing agents, thereby reducing the O2 concentration in the target compartment.

[0003] 16 is a perspective view showing an extinguishing gas injection unit 1 used in a gas fire extinguishing system of the prior art. The extinguishing gas injection unit 1 includes an injection head 3 for injecting high-pressure extinguishing gas supplied from an extinguishing gas supply source 2 in the event of a fire, and a conduit 4 to which the injection head 3 is connected.

[0004] The conduit 4 has a main pipe 5 connected to the extinguishing gas supply source 2, a branch pipe 6 interposed in the main pipe 5, and a branch pipe 7 to which the extinguishing gas from the main pipe 5 is guided by the branch pipe 6 and to which the injection head 3 is connected. The main pipe 5 is fastened to the building frame or a base 8 and bracket 9 fixed to the frame by fasteners 10 such as U-bolts, and is installed in a state in which vibration and displacement of the injection head 3 are suppressed (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-173565 Summary of the Invention [Problem to be solved by the invention]

[0006] In the conventional technology, a large amount of high-pressure extinguishing gas supplied from the extinguishing gas supply source 2 through the conduit 4 is sprayed from the spray head 3. This causes a problem in that the extinguishing gas flow sprayed at high speed from the nozzle hole 116 formed in the nozzle portion 112 of the spray head 3 generates a loud noise that cuts through the air.

[0007] An object of the present invention is to provide a gas fire extinguishing system capable of attenuating sound caused by a jet of fire extinguishing gas from a jet head. [Means for solving the problem]

[0008] The present invention relates to (a) a duct 14 for conducting high pressure fire extinguishing gas; (b) a fire extinguishing gas supply source 15 for supplying high pressure fire extinguishing gas to the duct 14; (c) an ejection head 13, A nozzle portion 12 having a nozzle hole 16 formed therein for spraying high-pressure fire extinguishing gas toward a space in a fire-extinguishing target compartment in a building; a jet head 13 having an end connected to an end of a conduit 14; (d) A sound suppression device 17, 17b, 17c, 17f, 17g, 17h that attenuates the sound generated by the discharge of the extinguishing gas from the nozzle portion 12 and injects it into the space within the fire extinguishing target compartment, A silencer 17, 17b, 17c having an attachment portion 43 that is detachable from the injection head 13; This gas fire extinguishing system is characterized by being equipped with 17f, 17g, and 17h. The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of: The nozzle portion 12 of the injection head 13 is disposed on the downstream side ( (left side of Figures 2, 4, 5, 13, 14, and 15) The end of the injection head is located on the upstream side of the injection direction of the extinguishing gas in the injection head 13 (FIGS. 2, 4, 5, 13, 14, and 15 to the right of Nozzle bore 16 and the injection head end are characterized by extending along the axis of the end of conduit 14 . The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of: The injection head end is connected to the end of the conduit 14 by a first screw; The silencers 17, 17b, 17c, 17f, 17g, and 17h are detachably attached to the nozzle portion 12 of the injection head 13 by the second screw. The silencers 17, 17b, 17c, 17f, 17g, 17h are characterized in that they have an axis extending along the axis of said end of the conduit 14. As shown in FIG. The silencer 17 includes a cylindrical peripheral wall 25, an end wall 26 formed at one axial end of the peripheral wall 25 perpendicular to the axis of the peripheral wall 25, and an attachment portion 27 formed at the other axial end of the peripheral wall 25 so as to be detachable from the injection head 13. A gas discharge hole 34 is formed in the end wall 26 on the axis of the peripheral wall 25 so as to penetrate the end wall in the thickness direction. A cylindrical sound absorbing material 33 is fitted along the inner circumferential surface of the peripheral wall 25 and accommodated in the internal space defined by the peripheral wall 25, the end wall 26 and the mounting portion 27. As shown in FIG. The silencer 17b is (e) a cylindrical peripheral wall 35 having an axis extending along the axis of the nozzle hole 16, A peripheral wall 35 that defines an internal space 39 extending downstream from the outlet of the nozzle hole 16 in the direction of injection of the extinguishing gas; (f) an end wall 36 formed at one end of the peripheral wall 35 away from the nozzle portion 12 in the axial direction, the end wall 36 defining the internal space 39 together with the peripheral wall 35, the end wall 36 having a plurality of air holes 38 formed therethrough in the thickness direction of the end wall 36; (g) a mounting portion 37 formed at the other end of the peripheral wall 35 near the nozzle portion 12 in the axial direction and removably mounted to the ejection head 13; (h) a sound-absorbing material 40 packed and housed in the internal space 39, It has fine voids, The extinguishing gas is sprayed at high speed from the nozzle portion 12 of the spray head 13, and is diffused by the sound absorbing material 40 contained in the internal space 39, gradually reducing its pressure and expanding it to reduce its flow rate, absorbing vibrations of the sprayed flow of the extinguishing gas, and is released from the ventilation hole 38 into the space within the compartment to be extinguished. As shown in FIG. The silencer 17c is (i) a cylindrical peripheral wall 41 having an axis extending along the axis of said end of the conduit 14; An internal space 45 is formed which expands downstream in the direction of injection of the extinguishing gas from the outlet of the nozzle hole 16, (j) a peripheral wall 41 having a plurality of ventilation holes 44 distributed therein and formed to penetrate the peripheral wall 41 in a thickness direction; and (j) an end wall 42 formed perpendicular to the axis of the peripheral wall 41 at one end of the peripheral wall 41 away from the nozzle portion 12 in the axial direction thereof and defining an internal space 45 together with the peripheral wall 41. (k) a mounting portion 43 formed at the other end of the peripheral wall 41 near the nozzle portion 12 in the axial direction, the mounting portion 43 being detachable from the nozzle portion 12 of the ejection head 13 by the second screw; (l) A sound-absorbing material 46 that is packed tightly and accommodated in the internal space 45, The extinguishing gas is injected from the nozzle portion 12 of the injection head 13 at high speed and diffuses within the internal space 45, gradually reducing its pressure and expanding the gas to reduce its flow rate, absorbing vibrations of the injected flow of the extinguishing gas, and discharging it from the ventilation hole 44 into the space within the compartment to be extinguished. As shown in FIG. The nozzle hole 16 has a nozzle hole axis L12 extending along the conduit axis of the end of the conduit 14, and the cross section of the nozzle hole 16 perpendicular to the nozzle hole axis L12 is uniform along the nozzle hole axis L12, An end surface 12a around the outlet end of the nozzle hole 16 in the nozzle portion 12 of the injection head 13 is formed on a virtual plane perpendicular to the nozzle hole axis L12, The silencer 17f is (m) a cylindrical peripheral wall 121 having a peripheral wall axis L121 extending along the nozzle hole axis L12, A peripheral wall 121 that defines an internal space 124 extending downstream from the outlet of the nozzle hole 16 in the direction of injection of the extinguishing gas; (n) an end wall 122 formed to be continuous with one end of the peripheral wall 121 away from the nozzle portion 12 in the direction of the peripheral wall axis L121, defining the internal space 124 together with the peripheral wall 121, and having a through hole 122b formed therethrough in the direction of the peripheral wall axis L121; (o) a mounting portion 123 formed at the other end of the peripheral wall 121 close to the nozzle portion 12 in the direction of the peripheral wall axis L121 and mounted to the ejection head 13; (p) a sound-absorbing material 125 packed tightly and accommodated in the internal space 124, Made of a porous material, It is a columnar shape having a sound absorbing material axis L125 that coincides with the peripheral wall axis L121, The sound absorbing material 125 has one end surface 125b that is away from the nozzle portion 12 and another end surface 125c that is close to the nozzle portion 12, The other end surface 125c of the sound absorbing material 125 close to the nozzle portion 12 is formed on a virtual plane perpendicular to the sound absorbing material axis L125, When the mounting portion 123 is mounted on the ejection head 13, the one end surface 125b is supported by the end wall 122, and the other end surface 125c and the end surface 12a of the nozzle portion 12 are in surface contact with each other. It has fine voids, The extinguishing gas is sprayed at high speed from the nozzle portion 12 of the spray head 13, and diffused by the sound absorbing material 125 contained in the internal space 124, gradually reducing its pressure and expanding it to reduce its flow rate, absorbing vibrations of the sprayed flow of the extinguishing gas, and releasing it from the through hole 122b into the space within the compartment to be extinguished. As shown in FIG. The end surface around the outlet end of the nozzle hole 16 in the nozzle portion 12 of the injection head 13 is formed on a virtual plane perpendicular to the axis of the nozzle hole 16, The silencer 17g is (q) a cylindrical peripheral wall 131 having an axis extending along the axis of the nozzle hole 16, A peripheral wall 131 that defines an internal space 140 extending downstream from the outlet of the nozzle hole 16 in the direction of injection of the extinguishing gas; (r) an end wall 143 formed at one end of the peripheral wall 131 away from the nozzle portion 12 in the axial direction, defining the internal space 140 together with the peripheral wall 131, and having a through hole formed therethrough in the axial direction of the peripheral wall 131; (s) a mounting portion 133 formed at the other end of the peripheral wall 131 close to the nozzle portion 12 in the axial direction and mounted on the ejection head 13; (t) First, second and third sound absorbing materials 134, 135, 136 housed in the internal space 140 36, which is made of a porous metal and extends from the nozzle portion 12 to the end in the axial direction of the peripheral wall 131. The wall 143 is provided with a first sound absorbing material 134, A third sound-absorbing material 136 and a second sound-absorbing material 135 are provided in this order. The first sound absorbing material 134 and the second sound absorbing material 135 are pillars having an axis that coincides with the axis of the peripheral wall 131. It is in the form The third sound absorbing material 136 is cylindrical and has an axis that coincides with the axis of the peripheral wall 131. The end face of the first sound absorbing material 134 close to the nozzle portion 12 is formed on an imaginary plane perpendicular to the axis of the first sound absorbing material 134, The second sound absorbing material 135 has an end face away from the nozzle portion 12, When the mounting portion 133 is attached to the injection head 13, the end face of the second sound absorbing material 135 that is farther from the nozzle portion 12 comes into contact with the end wall 143, and the end face of the first sound absorbing material 134 that is closer to the nozzle portion 12 comes into surface contact with the end face of the nozzle portion 12, These first, second and third sound absorbing materials 134, 135, 136 are: It has fine voids, The extinguishing gas is sprayed at high speed from the nozzle portion 12 of the spray head 13, and is diffused by the first to third sound absorbing materials 134, 135, 136 contained in the internal space 140, which gradually reduce the pressure and expand the extinguishing gas to reduce its flow rate, absorb vibrations of the sprayed flow of the extinguishing gas, and release it from the through hole 122b into the space within the compartment to be extinguished. As shown in FIG. The injection head 13 is a cylindrical portion 167 that is connected to an end of the conduit 14, extends along the axis of the end, and has a plurality of nozzle holes 16 formed therethrough in the thickness direction; and an end wall portion 165 that closes one axial end of the cylindrical portion 167 that is remote from the end of the conduit 14. Silencer 17h is (u) a first sound-absorbing material 152, It is formed into a cylindrical shape, The cylindrical portion 167 of the ejection head 13 is inserted through the a first sound absorbing material 152 having an inner circumferential surface that is in surface contact with an arc-shaped end surface around the outlet end of the nozzle hole 16, which is the outer circumferential surface of the cylindrical portion 167 of the ejection head 13; (v) a casing 150, (v1) A cylindrical portion 157 extending along the axis of the cylindrical portion 167 of the ejection head 13 and surrounding the first sound absorbing material 152 at an interval in the radial direction, (v2) a casing 150 having a casing end wall 159 that closes a cylindrical portion 157 near the end of the conduit 14 and is connected to the injection head 13; (w) a second sound-absorbing material 153 formed in a cylindrical shape, arranged along the inner peripheral surface of the cylindrical portion 157, and forming an annular space 170 between itself and the outer peripheral surface of the first sound-absorbing material 152; (x) a third sound-absorbing material 156 is disposed at an end of the casing 150 in the cylindrical portion 157 remote from the end of the conduit 14, and discharges the extinguishing gas from the annular space into a space within the fire-extinguishing compartment; (y) These first, second and third sound absorbing materials 152, 153, 156 are It has fine voids, The extinguishing gas jetted at high speed from the nozzle portion 12 of the jet head 13 is diffused and gradually decompressed and expanded to reduce its flow rate, thereby absorbing the vibration of the jet flow of the extinguishing gas. The present invention relates to Silencers 17b; 17c; 17f; 17g; 17h An end surface 125c of the sound absorbing material 40; 46; 125; 134; 152 is in surface contact with an end surface 12a around the outlet end of the nozzle hole 16 where the nozzle hole 16 opens in the nozzle portion 12 of the ejection head 13, and the sound absorbing material 40; 46; 125; 134; 152 has minute gaps, The extinguishing gas is sprayed at high speed from the nozzle hole 16 of the nozzle portion 12 formed in the spray head 13, and is diffused by the sound absorbing material 40; 46; 125; 134; 152, and gradually decompressed and expanded to reduce its flow rate.

[0009] According to the present invention, high pressure extinguishing gas supplied from a fire extinguishing gas supply source to a duct is sprayed into a space within a building through a spray head. Such a spray head is provided with a sound suppressing device, which can prevent the generation of a loud spray sound caused by the spray flow of the fire extinguishing gas sprayed at high speed from the nozzle of the spray head. Effect of the Invention

[0010] According to the present invention, since the injection head is provided with a silencer, it is possible to prevent a loud injection sound from being generated even when the extinguishing gas is injected from the nozzle of the injection head in the event of a fire. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view showing an extinguishing gas ejection unit 11 provided in a gas fire extinguishing system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged cross-sectional view of the silencer 17. [Diagram 3] 2 is an enlarged cross-sectional view showing a silencer 17a provided in a gas fire extinguishing system according to one embodiment of the present invention. FIG. [Figure 4]13 is an enlarged cross-sectional view showing a silencer 17b provided in a gas fire extinguishing system according to another embodiment of the present invention. FIG. [Diagram 5] 13 is an enlarged cross-sectional view showing a silencer 17c provided in a gas fire extinguishing system according to still another embodiment of the present invention. FIG. [Figure 6] FIG. 4 is a cross-sectional view showing an injection head 50 of a gas fire extinguishing system according to another embodiment of the present invention. [Figure 7] 7 is a cross-sectional view for explaining the effect of the ejection head 50 shown in FIG. 6. FIG. [Figure 8] FIG. 2 is an enlarged cross-sectional view showing a silencer 60 provided in a gas fire extinguishing system according to still another embodiment of the present invention. [Figure 9] FIG. 11 is an enlarged cross-sectional view showing a silencer 60a provided in a gas fire extinguishing system according to still another embodiment of the present invention. [Figure 10] 13 is an enlarged cross-sectional view showing a silencer 17d provided in a gas fire extinguishing system according to still another embodiment of the present invention. FIG. [Figure 11] 13 is a graph for explaining the noise reduction effect of the noise reduction device 17d. [Figure 12] 13 is an enlarged cross-sectional view showing a silencer 17e provided in a gas fire extinguishing system according to still another embodiment of the present invention. FIG. [Figure 13] 13 is an enlarged cross-sectional view showing a silencer 17f provided in a gas fire extinguishing system according to still another embodiment of the present invention. FIG. [Figure 14] 13 is an enlarged cross-sectional view showing a silencer 17g provided in a gas fire extinguishing system according to still another embodiment of the present invention. FIG. [Figure 15] 13 is an enlarged cross-sectional view showing a silencer 17h provided in a gas fire extinguishing system according to still another embodiment of the present invention. FIG. [Figure 16] FIG. 1 is a perspective view showing a fire extinguishing gas ejection unit 1 used in a gas fire extinguishing system of the prior art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] 1 is a perspective view showing an extinguishing gas injection unit 11 provided in a gas fire extinguishing system according to an embodiment of the present invention. The gas fire extinguishing system of this embodiment is provided in a fire extinguishing compartment of a building, and includes an injection head 13 having a nozzle unit 12 for injecting high-pressure extinguishing gas toward the space in the fire extinguishing compartment, a conduit 14 to which the injection head 13 is connected and for introducing high-pressure extinguishing gas to the injection head 13, an extinguishing gas supply source 15 for supplying high-pressure inert gas to the conduit 14, and a gas supply unit 16 for supplying high-pressure inert gas to the conduit 14. and a sound absorbing device 17 for attenuating sounds generated due to the ejection sound of the extinguishing gas ejected from the nozzle hole 16 formed in the nozzle portion 12.

[0013] The extinguishing gas is realized by an inert gas such as N2 gas and CO2 gas, or an active gas such as a halogenated gas, and by releasing such an extinguishing gas as an extinguishing agent, the O2 concentration in the area to be extinguished can be reduced to extinguish the fire.

[0014] The extinguishing gas injection section 11 is constituted by the injection head 13 and the silencer 17. The extinguishing gas injection section 11 is supplied with extinguishing gas from an extinguishing gas supply source 15 through a conduit 14 to the injection head 13. The conduit 14 includes a main pipe 23 connected to the extinguishing gas supply source 15, a branch pipe 18 interposed in the main pipe 23, and a branch pipe 19 connected to the branch pipe 18, and high-pressure extinguishing gas from the extinguishing gas supply source 15 is guided to the injection head 13 through the conduit 14. The conduit 14 is fastened to a base 20 and a bracket 21 by fasteners 22 such as U-bolts, and is installed on the building frame in a state where vibration and displacement are suppressed.

[0015] 2 is an enlarged cross-sectional view of the silencer 17. The silencer 17 includes a cylindrical peripheral wall 25, an end wall 26 formed at one axial end of the peripheral wall 25 perpendicular to the axis of the peripheral wall 25, an attachment part 27 at the other axial end of the peripheral wall 25 and detachably connected to the injection head 13, and a cylindrical sound absorbing material 33 attached and housed in the peripheral wall 25 along its inner circumferential surface. Such sound absorbing material 33 may be formed by laminating a plurality of wire meshes, for example. Gas release holes 34 are formed on the same axis in the end wall 26.

[0016] By using the silencer 17 configured in this manner, the acoustic vibrations caused by the jet flow of the extinguishing gas jetted at high speed from the nozzle portion 12 of the jet head 13 are absorbed by the sound absorbing material 33 and are discharged to the outside from the gas discharge hole 34. This makes it possible to suppress the generation of jet sounds caused by the jetting of the extinguishing gas.

[0017] 2 includes a cylindrical peripheral wall 25, an end wall 26 formed perpendicular to the axis of the peripheral wall 25 at one axial end of the peripheral wall 25, and an attachment portion 27 formed detachably on the injection head 13 at the other axial end of the peripheral wall 25. A gas discharge hole 34 is formed in the end wall 26 on the axis of the peripheral wall 25 so as to penetrate the end wall in the thickness direction. A cylindrical sound absorbing material 33 attached along the inner circumferential surface of the peripheral wall 25 is accommodated in the internal space defined by the peripheral wall 25, the end wall 26 and the attachment portion 27.

[0018] 3 is an enlarged cross-sectional view showing a silencer 17a provided in a gas fire extinguishing system according to a reference example of the present invention. The same reference numerals are used for parts corresponding to the above-mentioned embodiment. The silencer 17a of this reference example includes a cylindrical peripheral wall 25, an end wall 26 formed perpendicular to the axis of the peripheral wall 25 at one axial end of the peripheral wall 25, a mounting portion 27 integrally formed with the injection head 13 at the other axial end of the peripheral wall 25, and an inner cylinder 29 provided at a portion 28 of the nozzle portion 12 of the injection head 13 facing downstream in the injection direction of the extinguishing gas.

[0019] The inner cylinder 29 has a right cylindrical tubular portion 31 in which a plurality of through holes 30 are formed, and an end plate 32 formed perpendicular to the axis of the tubular portion 31 at one axial end of the tubular portion 31.

[0020] With this type of sound-absorbing device 17, the extinguishing gas sprayed at high speed from the nozzle portion of the spray head 13 collides with the cylindrical end plate 32 of the inner cylinder 29 inside the inner cylinder 29, is released from multiple through holes 30 formed in the cylindrical portion 31, and then passes through the space between the cylindrical portion 31 and the peripheral wall 25 before being released to the outside from the gas release hole 34 formed in the end wall 26, thereby suppressing the generation of noise caused by the release of the extinguishing gas.

[0021] 4 is an enlarged cross-sectional view showing a silencer 17b provided in a gas fire extinguishing system according to another embodiment of the present invention. The silencer 17b of this embodiment has a cylindrical peripheral wall 35, an end wall 36 formed at one axial end of the peripheral wall 35 perpendicular to the axis of the peripheral wall 35, and an attachment part 37 formed at the other axial end of the peripheral wall 35 so as to be detachable from the injection head 13. A plurality of ventilation holes 38 are formed in the end wall 36 so as to penetrate the end wall 36 in the thickness direction.

[0022] The sound absorbing device 17b also accommodates a sound absorbing material 40 in an internal space 39 defined by the peripheral wall 35, the end wall 36, and the mounting portion 37. The sound absorbing material 40 may be formed by laminating a plurality of wire meshes.

[0023] The silencer 17b in FIG. 4 comprises: (e) a cylindrical peripheral wall 35 having an axis extending along the axis of the nozzle hole 16, the peripheral wall 35 forming an internal space 39 extending downstream from the outlet of the nozzle hole 16 in the direction of injection of the extinguishing gas; (f) an end wall 36 formed at one end of the peripheral wall 35 away from the nozzle portion 12 in the axial direction, the end wall 36 defining the internal space 39 together with the peripheral wall 35, and having a plurality of ventilation holes 38 formed in the end wall 36 so as to penetrate therethrough in the thickness direction of the end wall 36; and (g) a cylindrical peripheral wall 35 extending in the axial direction of the peripheral wall 35. and (h) a mounting portion 37 formed at the other end near the nozzle portion 12 of the injection head 13 and removably mounted on the injection head 13, and a sound-absorbing material 40 packed and accommodated in the internal space 39, the sound-absorbing material 40 having fine gaps, which diffuses the extinguishing gas injected at high speed from the nozzle portion 12 of the injection head 13 in the sound-absorbing material 40 accommodated in the internal space 39, gradually reducing its pressure and expanding the material to reduce the flow rate, absorbing vibrations of the injected flow of the extinguishing gas, and releasing it from the ventilation hole 38 into the space within the compartment to be extinguished.

[0024] In the gas fire extinguishing equipment equipped with the silencer 17a configured in this manner, the extinguishing gas injected at high speed from the nozzle portion 12 of the injection head 13 passes through the space in the peripheral wall 35, collides with the end wall 36, and is released to the outside from a plurality of ventilation holes 38 formed in the end wall 36. This configuration of the silencer also prevents the generation of loud noise.

[0025] 5 is an enlarged cross-sectional view showing a silencer 17c provided in a gas fire extinguishing system according to still another embodiment of the present invention. The same reference numerals are used for parts corresponding to those in the above-mentioned embodiment. The silencer 17c of this embodiment has a cylindrical peripheral wall 41, an end wall 42 formed perpendicular to the axis of the peripheral wall 41 at one axial end of the peripheral wall 41, and an attachment part 43 formed detachably on the injection head 13 at the other axial end of the peripheral wall 41. A plurality of ventilation holes 44 are formed in the peripheral wall 41 so as to penetrate the peripheral wall 41 in the thickness direction.

[0026] In the silencer 17c, a sound absorbing material 46 is accommodated in an internal space 45 defined by the peripheral wall 41, the end wall 42, and the mounting portion 43. The sound absorbing material 46 may be formed, for example, by laminating a plurality of wire meshes.

[0027] The silencer 17c of FIG. 5 comprises: (i) a cylindrical peripheral wall 41 having an axis extending along the axis of the end of the conduit 14, and forming an internal space 45 extending perpendicular to the axis of the peripheral wall 41 downstream from the outlet of the nozzle hole 16 in the injection direction of the extinguishing gas, and a plurality of ventilation holes 44 are distributed and formed through the peripheral wall 41 in the thickness direction; (j) an end wall 42 formed perpendicular to the axis of the peripheral wall 41 at one end of the peripheral wall 41 away from the nozzle portion 12 in the axial direction, and defining the internal space 45 together with the peripheral wall 41; and (k) a nozzle hole in the axial direction of the peripheral wall 41. and (l) a mounting portion 43 formed at the other end near the nozzle portion 12 of the injection head 13, which is detachably attached to the nozzle portion 12 of the injection head 13 by the second screw; and (l) a sound-absorbing material 46 packed tightly and contained in the internal space 45, which has fine gaps and diffuses the extinguishing gas injected at high speed from the nozzle portion 12 of the injection head 13 within the internal space 45, gradually reducing the pressure and expanding the material to reduce the flow rate, absorbing vibrations of the injected flow of the extinguishing gas, and releasing it from the ventilation hole 44 into the space within the compartment to be extinguished.

[0028] In the gas fire extinguishing equipment equipped with the silencer 17c thus configured, the extinguishing gas injected from the nozzle portion 12 of the injection head 13 collides with the end wall 42, the flow velocity of which is attenuated, and is then discharged to the outside through the multiple ventilation holes 44 formed in the peripheral wall 41. This prevents the injection of the extinguishing gas from generating a large sound.

[0029] Fig. 6 is a cross-sectional view showing a jet head 50 of a gas fire extinguishing system according to a further embodiment of the present invention, and Fig. 7 is a cross-sectional view for explaining the effect of the jet head 50 shown in Fig. 6. The same reference numerals are used for parts corresponding to the above-mentioned embodiment. The gas fire extinguishing system of this embodiment includes a jet head 50 provided in a building and having a nozzle portion 12 for jetting high-pressure extinguishing gas toward a space in the building, a conduit 14 to which the jet head 50 is connected and for directing the high-pressure extinguishing gas to the jet head 50, and a fire extinguishing gas supply source 15 for supplying the high-pressure extinguishing gas to the conduit 14.

[0030] The nozzle portion 12 of the injection head 50 is formed with a nozzle hole 16 having an inner peripheral surface 52 that smoothly connects to an inner peripheral surface 51 of the branch pipe 19 of the conduit 14 .

[0031] By using the injection head 50 thus configured, the high-pressure extinguishing gas supplied from the extinguishing gas supply source 15 to the conduit 14 is injected toward the space inside the building through the nozzle hole 16 of the injection head 50. At this time, the injection head 50 is formed with the nozzle hole 16 having an inner circumferential surface 52 smoothly connected to the inner circumferential surface 51 of the branch pipe 19 of the conduit 14, so that it is possible to prevent the generation of a loud injection sound caused by the injection flow of the extinguishing gas injected at high speed from the nozzle portion 12 of the injection head 50, for example, an edge portion 55 facing the inlet of the nozzle hole 16 having an inner diameter D2 smaller than the inner diameter D1 of the branch pipe 19 of the conduit 14 in the injection head 50a shown in FIG.

[0032] 8 is an enlarged cross-sectional view showing a silencer 60 provided in a gas fire extinguishing system according to still another embodiment of the present invention. The same reference numerals are used for parts corresponding to those in the above-mentioned embodiment. The silencer 60 of this embodiment has a cylindrical peripheral wall 61, an attachment part 62 formed at one axial end of the peripheral wall 61 so as to be detachable from the branch pipe 19, an attachment part 63 formed at the other axial end of the peripheral wall 61 so as to be detachable from the jet head 13, an end wall 64 formed at the one end perpendicular to the axis of the peripheral wall 61, and an end wall 65 formed at the other end perpendicular to the axis of the peripheral wall 61.

[0033] At least one through hole 66 is formed in the end wall 64 so as to penetrate in the thickness direction of the end wall 64. The at least one through hole 66 is formed in a central portion 68 of the end wall 64 about the axis of the peripheral wall 61 and serves to throttle the flow rate of the extinguishing gas supplied from the branch pipe 19. A plurality of through holes 67 are formed in the end wall 65 so as to penetrate in the thickness direction of the end wall 65. The plurality of through holes 67 are formed in the remaining peripheral portion 70 of the end wall 65 excluding a central portion 69 of the end wall 65 about the axis of the peripheral wall 61. The end walls 64, 65 are made of, for example, punched metal.

[0034] With this type of silencer 60, the extinguishing gas injected at high speed from the through hole 66 formed in the end wall 64 collides with the center 69 of the end wall 65 inside the silencer 60, attenuating its flow velocity, and is released from the multiple through holes 67 formed in the end wall 65 into the space defined by the end wall 65 and the injection head 13, and then released to the outside from the nozzle hole 16 formed in the nozzle portion 12. The silencer 60 expands the extinguishing gas injected at high speed from the through hole 66 formed in the end wall 64 in the space inside the silencer 60, thereby reducing the flow velocity at the through hole 67 formed in the end wall 65, thereby suppressing the generation of sound caused by the release of the extinguishing gas from the nozzle hole 16.

[0035] In the reference example shown in FIG. 8, the through hole 67 is not formed in the central portion 69 of the end wall 65, but the through hole 67 may be formed in the central portion 69 of the end wall 65. When the through hole 67 is not formed in the central portion 69 of the end wall 65, the through hole 67 is smaller than when the through hole 67 is formed in the central portion 69 of the end wall 65. The extinguishing gas sprayed at high speed from nozzle 6 is reflected in large quantities, further reducing the flow rate, resulting in a high noise reduction effect.

[0036] Fig. 9 is an enlarged cross-sectional view showing a silencer 60a provided in a gas fire extinguishing system according to another embodiment of the present invention. The same reference numerals are used for parts corresponding to the above-mentioned embodiment. The silencer 60a of this embodiment has a cylindrical peripheral wall 61, an attachment part 62 formed on one axial end of the peripheral wall 61 so as to be detachable from the branch pipe 19, an attachment part 63 formed on the other axial end of the peripheral wall 61 so as to be detachable from the jet head 13, an end wall 64a formed on the one end perpendicular to the axis of the peripheral wall 61, and an end wall 65 formed on the other end perpendicular to the axis of the peripheral wall 61.

[0037] In the end wall 64a, a guide portion 72 having a plurality of nozzle holes 71 for ejecting the high-pressure extinguishing gas supplied from the branch pipe 19 into an internal space defined by the peripheral wall 61 and the end walls 64a and 65 is formed on the axis of the peripheral wall 61 facing the internal space. The plurality of nozzle holes 71 of the guide portion 72 are formed on an axis perpendicular to the axis of the peripheral wall 61, spaced at equal angles in the circumferential direction with respect to the axis of the peripheral wall 61. In the end wall 65, a plurality of through holes 67 are formed penetrating the end wall 65 in the thickness direction. The plurality of through holes 67 are formed in the remaining peripheral portion 70 except for the central portion 69 of the end wall 65, centered on the axis of the peripheral wall 61. The end wall 65 is made of, for example, punching metal. In the reference example shown in FIG. 9, the through hole 67 is not formed in the central portion 69 of the end wall 65, but the through hole 67 may be formed in the central portion 69 of the end wall 65.

[0038] With this type of silencer 60a, the extinguishing gas injected at high speed from the nozzle hole 71 of the guide portion 72 formed in the end wall 64a collides with the inner circumferential surface of the peripheral wall 61 in the silencer 60a, attenuating its flow velocity, and is released from the multiple through holes 67 formed in the end wall 65 into the space defined by the end wall 65 and the injection head 13, and then released to the outside from the nozzle hole 16 formed in the nozzle portion 12. The silencer 60a expands the extinguishing gas injected at high speed from the nozzle hole 71 in the space within the silencer 60, thereby reducing the flow velocity at the through holes 67 formed in the end wall 65, thereby suppressing the generation of sound caused by the extinguishing gas being released from the nozzle hole 16.

[0039] 10 is an enlarged cross-sectional view showing a silencer 17d provided in a gas fire extinguishing system according to still another embodiment of the present invention. The silencer 17d is preferably used by being attached to a jet head 13 provided on a wall surface of a compartment to be extinguished, for example.

[0040] The parts corresponding to the above-mentioned embodiment are given the same reference numerals. The muffler 17d of this reference embodiment includes a cylindrical peripheral wall 81, an end wall 82 formed perpendicular to the axis of the peripheral wall 81 at one end in the axial direction of the peripheral wall 81, an end wall 84 having an attachment portion 83 detachably formed on the injection head 13 and formed perpendicular to the axis of the peripheral wall 81 at the other end in the axial direction of the peripheral wall 81, a barrier 85 formed perpendicular to the axis of the peripheral wall 81 between the end walls 82 and 84, a cylindrical conduit 87 for guiding the extinguishing gas injected from the injection head 13 to a muffler chamber 86, which is an internal space defined by the peripheral wall 81, the end wall 82, and the barrier 85, and a cylindrical vent pipe 89 for guiding the extinguishing gas in the muffler chamber 88, which is an internal space defined by the peripheral wall 81, the end wall 84, and the barrier 85, to the outside of the muffler 17d.

[0041] The peripheral wall 81, the end wall 82 and the end wall 84 are made of, for example, a sound-deadening material. The barrier 85 has a plurality of through holes 851 formed therethrough in the thickness direction of the barrier 85. The barrier 85 is made of, for example, a punching metal.

[0042] The conduit 87 is disposed so as to penetrate the barrier 85 and protrude into the muffling chamber 86. The conduit 87 is provided with a connecting portion 871 at one axial end thereof, which is detachably connected to the injection head 13, and an end plate 872 at the other axial end thereof. A portion 873 of the conduit 87 protruding into the silencing chamber 86 has a plurality of through holes 874 formed therein, penetrating the peripheral wall of the conduit 87 in the thickness direction. The portion 873 of the conduit 87 in which the plurality of through holes 874 are formed is made of, for example, punching metal. The vent pipe 89 is disposed penetrating the barrier 85 and the end wall 82, has a wire mesh 891 at its opening on the silencing chamber 88 side, and injects extinguishing gas from a fire extinguishing gas injection port 892 which is an opening to the outside. The material of the vent pipe 89 is, for example, polyvinyl chloride.

[0043] By this silencer 17d, the extinguishing gas injected at high speed from the multiple through holes 874 formed in the conduit 87 into the silencing chamber 86 is discharged into the silencing chamber 88 from the multiple through holes 851 formed in the barrier 85. The extinguishing gas discharged into the silencing chamber 88 from the through holes 851 is discharged to the outside of the silencer 17d through the ventilation pipe 89. The silencer 17d expands the extinguishing gas injected at high speed from the multiple through holes 874 in the space inside the silencing chamber 86 and the space inside the silencing chamber 88, thereby reducing the flow velocity in the ventilation pipe 89, thereby suppressing the generation of sound caused by the discharge of the extinguishing gas from the ventilation pipe 89.

[0044] [Table 1]

[0045] Table 1 shows examples of calculations of pressure and flow rate for Examples 1 and 2 of gas fire extinguishing equipment using silencer 17d. In Example 1, the hole diameter of vent pipe 89 of silencer 17d is 50 mm, and in Example 2, the hole diameter of vent pipe 89 of silencer 17d is 80 mm. The pressure is the pressure in muffling chamber 86, and the flow rate (m / s) is the flow rate at extinguishing gas nozzle 892 of vent pipe 89.

[0046] When extinguishing gas at 2 atmospheres is injected into the atmosphere at 1 atmosphere, the flow velocity is about 340 m / s, generating a loud noise. By lowering the pressure inside the sound-proofing chamber 86, the flow velocity at the fire extinguishing gas outlet 892 can be lowered, thereby reducing the volume of the sound. In the first embodiment, the pressure inside the sound-proofing chamber 86 is about 1.5 atmospheres, and the flow velocity at the fire extinguishing gas outlet 892 is about 250 (m / s). In the second embodiment, the pressure inside the sound-proofing chamber 86 is about 1.1 atmospheres, and the flow velocity at the fire extinguishing gas outlet 892 is about 100 (m / s).

[0047] 11 is a graph for explaining the silencing effect of the silencer 17d. The vertical axis is sound pressure (dB) and the horizontal axis is distance (m) from the nozzle portion 12. Graph 91 is a graph for the case where a silencer is not used, graph 92 is a graph for the case of Example 1, and graph 93 is a graph for the case of Example 2.

[0048] At a position 2 (m) away from the nozzle portion 12, when a silencer is not used, the sound pressure is about 125 dB, but in Example 1, the sound pressure is reduced to about 105 dB, and in Example 2, the sound pressure is reduced to about 100 dB. Similarly, at a position 10 (m) away from the nozzle portion 12, when a silencer is not used, the sound pressure is about 115 dB, but in Example 1, the sound pressure is reduced to about 96 dB, and in Example 2, the sound pressure is reduced to about 92 dB. That is, compared to when a silencer is not used, the sound pressure can be reduced by about 20 dB in Example 1, and by about 25 dB in Example 2.

[0049] 12 is an enlarged cross-sectional view of a silencer 17e provided in a gas fire extinguishing system according to a further embodiment of the present invention. The silencer 17e is, for example, a spray nozzle provided on the ceiling of a compartment to be extinguished. The silencer 17e of this embodiment is preferably used by attaching it to the head 13. The same reference numerals are used for the parts corresponding to the above-mentioned embodiment. The silencer 17e of this embodiment includes a cylindrical peripheral wall 81, an end wall 82 formed perpendicular to the axis of the peripheral wall 81 at one end in the axial direction of the peripheral wall 81, an attachment portion 83 formed detachably on the injection head 13, an end wall 84 formed perpendicular to the axis of the peripheral wall 81 at the other end in the axial direction of the peripheral wall 81, a barrier 85 formed perpendicular to the axis of the peripheral wall 81 between the end wall 82 and the end wall 84, a cylindrical conduit 87 for guiding the extinguishing gas injected from the injection head 13 to a silencing chamber 86, which is an internal space defined by the peripheral wall 81, the end wall 82, and the barrier 85, and a plurality of cylindrical vent pipes 89a for guiding the extinguishing gas in the silencing chamber 88, which is an internal space defined by the peripheral wall 81, the end wall 84, and the barrier 85, to the outside of the silencer 17e.

[0050] The peripheral wall 81, the end wall 82 and the end wall 84 are made of, for example, a sound-deadening material. The barrier 85 has a plurality of through holes 851 formed therethrough in the thickness direction of the barrier 85. The barrier 85 is made of, for example, a punching metal.

[0051] The conduit 87 is disposed so as to penetrate the barrier 85 and protrude into the silencing chamber 86. A connecting portion 871 is formed at one axial end of the conduit 87, which is detachably connected to the injection head 13, and an end plate 872 is formed at the other axial end of the conduit 87. A portion 873 of the peripheral wall of the conduit 87 protruding into the silencing chamber 86 is formed with a plurality of through holes 874 penetrating the peripheral wall of the conduit 87 in the thickness direction. The portion 873 of the conduit 87 in which the plurality of through holes 874 are formed is made of, for example, punching metal. The plurality of ventilation pipes 89a are disposed on an axis perpendicular to the axis of the peripheral wall 81, at equal angular intervals in the circumferential direction with respect to the axis of the peripheral wall 81, and are formed so as to penetrate the peripheral wall 81, respectively. Each vent pipe 89a is formed with a fire extinguishing gas outlet 892a which is an opening to the outside of the silencer 17e, and the fire extinguishing gas is injected from each of the fire extinguishing gas outlets 892a to the outside of the silencer 17e. The material of the vent pipe 89a is, for example, polyvinyl chloride.

[0052] By this silencer 17e, the extinguishing gas injected into the silencing chamber 86 at high speed from the multiple through holes 874 formed in the conduit 87 is discharged into the silencing chamber 88 from the multiple through holes 851 formed in the barrier 85. The extinguishing gas discharged into the silencing chamber 88 from the through holes 851 is discharged to the outside of the silencer 17e through the ventilation pipe 89a. The silencer 17e expands the extinguishing gas injected at high speed from the multiple through holes 874 in the space in the silencing chamber 86 and the space in the silencing chamber 88, thereby reducing the flow velocity in the ventilation pipe 89a, thereby suppressing the generation of sound caused by the discharge of the extinguishing gas from the ventilation pipe 89a.

[0053] Fig. 13 is an enlarged cross-sectional view showing a silencer 17f provided in a gas fire extinguishing system according to still another embodiment of the present invention. The same reference numerals are used to refer to parts corresponding to those in the above-mentioned embodiment. The silencer 17f is preferably used by being attached to the injection head 13 provided on the wall surface of the fire extinguishing area, for example.

[0054] The silencer 17f of this embodiment has a cylindrical peripheral wall 121, an annular end wall 122 formed at one axial end of the peripheral wall 121 perpendicular to the axis of the peripheral wall 121, and an attachment portion 123 formed at the other axial end of the peripheral wall 121 and detachably attached to the injection head 13. The silencer 17f has a silencing chamber 124, which is an internal space defined by the injection head 13, the peripheral wall 121, and the end wall 122. A columnar sound absorbing material 125 is attached and housed in the silencing chamber 124 along the inner circumferential surface of the peripheral wall 121. The peripheral wall 121, the end wall 122, and the attachment portion 123 constitute a casing 129.

[0055] The inner peripheral surface 121a of the peripheral wall 121 facing the muffling chamber 124 of the casing 129 is formed in a cylindrical shape, and the inner surface 122a of the end wall 122 facing the muffling chamber 124 is formed on an imaginary plane perpendicular to the axis L121 of the peripheral wall 121. A linear through hole 122b is formed penetrating in the direction of the axis L121.

[0056] The sound absorbing material 125 is columnar, its outer peripheral surface 125a is formed in a cylindrical shape, and an end face 125b on one side in the direction of the axis L125 of the sound absorbing material 125 and an end face 125c on the other side are formed on an imaginary plane perpendicular to the axis L125. An end face 12a on the downstream side in the injection direction of the extinguishing gas in the nozzle portion 12 of the injection head 13 is formed on an imaginary plane perpendicular to the axis L12 of the nozzle portion 12.

[0057] In the silencer 17f, the sound absorbing material 125 is loaded into the space in the casing 129 from the mounting portion 123 side in such a position that the axis L125 of the sound absorbing material 125 coincides or approximately coincides with the axis L121 of the peripheral wall 121. For example, when the sound absorbing material 125 is a straight cylinder, it is configured to be detachable by screwing an outer thread engraved on the outer peripheral part of the nozzle part 12 downstream of the injection direction of the extinguishing gas into an inner thread engraved on the inner peripheral part of the mounting portion 123. In the silencer 17f, the sound absorbing material 125 is housed in the silencing chamber 124 in a state in which one end face 125b is in surface contact with the inner surface 122a of the end wall 122 and the other end face 125c is in surface contact with the end face 12a of the nozzle part 12. That is, the sound absorbing material 125 is packed in the silencing chamber 124 without any gaps.

[0058] In this embodiment, the hole diameter of the through hole 122b is set to a size that allows the extinguishing agent to be effectively discharged. The effective hole diameter portion of the through hole 122b may be on the peripheral wall surface side as well as the end wall surface side. By providing the effective hole diameter portion on the peripheral wall surface side, the effective area of ​​the portion on the single wall surface side can be reduced, and the silencer 17f can be made smaller. The silencer 17f can also be made smaller by packing the sound absorbing material 125 tightly in the space inside the casing 129.

[0059] The sound absorbing material 125 is made of a porous metal with continuous columnar voids. By providing such a sound absorbing material 125 immediately after the nozzle hole 16, the silencer 17f can gradually reduce the pressure and expand the extinguishing gas supplied from the branch pipe 19 side, and reduce the flow rate. This makes it possible to suppress the generation of injection noise caused by the injection of the extinguishing gas.

[0060] In detail, since the sound absorbing material 125 is packed tightly in the sound absorbing chamber 124, the extinguishing gas discharged from the nozzle hole 16 can be made to flow directly into the porous metal of the sound absorbing material 125, and the extinguishing gas that has flowed into the porous metal can be directly discharged from the through hole 122b. By making the extinguishing gas discharged from the nozzle hole 16 flow directly into the sound absorbing material 125, the extinguishing gas flows into the sound absorbing material 125 immediately after being discharged from the nozzle hole 16 before overexpanding and generating shock waves, and is rapidly decelerated and diffused. Therefore, the generation of strong turbulence accompanied by shock waves is prevented, and noise is suppressed.

[0061] In addition, since the extinguishing gas is diffused by the minute gaps in the sound absorbing material 125, the extinguishing gas discharged from the sound absorbing material 125 through the through holes 122b to the outside does not generate large shock waves because the flow velocity is attenuated, which also suppresses noise. In this way, the extinguishing gas can be prevented from being rapidly decompressed and expanded compared to when the end face 12a of the nozzle portion 12 and the end face 125c of the sound absorbing material 125 are spaced apart, and further, the extinguishing gas can be prevented from being rapidly decompressed and expanded compared to when the inner surface 122a of the end wall 111 and the end face 125b of the sound absorbing material 125 are spaced apart.

[0062] In this way, the sound absorbing material 125 of the sound absorbing device 17f of the present embodiment can reduce the flow rate of the extinguishing gas by gradually reducing the pressure and expanding the extinguishing gas, thereby suppressing the generation of injection noise caused by the injection of the extinguishing gas. Furthermore, the sound absorbing device 17f is configured to suppress the rapid reduction and expansion of the extinguishing gas, thereby suppressing the generation of noise caused by the rapid reduction and expansion of the extinguishing gas.

[0063] 13, the nozzle hole 16 has a nozzle hole axis L12 that extends along the conduit axis of the end of the conduit 14, and the cross section of the nozzle hole 16 perpendicular to the nozzle hole axis L12 is uniform along the nozzle hole axis L12. An end surface 12a around the outlet end of the nozzle hole 16 where the nozzle hole 16 opens in the nozzle section 12 of the injection head 13 is formed on an imaginary plane perpendicular to the nozzle hole axis L12. The silencer 17f includes: (m) a cylindrical peripheral wall 121 having a peripheral wall axis L121 extending along the nozzle hole axis L12, and forming an internal space 124 extending from the outlet of the nozzle hole 16 downstream in the injection direction of the extinguishing gas; (n) an end wall 122 formed to be continuous with one end of the peripheral wall 121 away from the nozzle portion 12 in the direction of the peripheral wall axis L121, defining the internal space 124 together with the peripheral wall 121, and having a through hole 122b formed therethrough in the direction of the peripheral wall axis L121; (o) an attachment portion 123 formed at the other end of the peripheral wall 121 close to the nozzle portion 12 in the direction of the peripheral wall axis L121, and attached to the injection head 13; and (p) a sound absorbing material 125 packed tightly into the internal space 124 and accommodated therein, the sound absorbing material being made of a porous material and having a sound absorbing material axis L125 coinciding with the peripheral wall axis L121. and has one end surface 125b away from the nozzle portion 12 of the sound-absorbing material 125 and the other end surface 125c close to the nozzle portion 12, the other end surface 125c of the sound-absorbing material 125 close to the nozzle portion 12 is formed on an imaginary plane perpendicular to the sound-absorbing material axis L125, and when the mounting portion 123 is attached to the injection head 13, the one end surface 125b side is supported by the end wall 122, and the other end surface 125c and the end surface 12a of the nozzle portion 12 are in surface contact with each other, and have fine gaps. The sound-absorbing material 125 diffuses the extinguishing gas injected at high speed from the nozzle portion 12 of the injection head 13 in the sound-absorbing material 125 accommodated in the internal space 124, gradually reduces the pressure and expands the extinguishing gas to reduce the flow rate, absorbs the vibration of the injected flow of the extinguishing gas, and releases it from the through hole 122b into the space in the compartment to be extinguished.

[0064] Fig. 14 is an enlarged cross-sectional view showing a silencer 17g provided in a gas fire extinguishing system according to still another embodiment of the present invention. The same reference numerals are used to refer to parts corresponding to those in the above-mentioned embodiment. In this embodiment, the silencer 17g is attached to the injection head 13 provided on the wall surface of the fire extinguishing target compartment, for example.

[0065] The silencer 17g of this embodiment has a cylindrical peripheral wall 131, an end wall 132 formed perpendicular to the axis of the peripheral wall 131 at the other axial end of the peripheral wall 131, and an attachment part 133 formed continuous with the end wall 132 and detachably attached to the injection head 13. An internal thread is engraved on the inner peripheral surface of one axial end of the peripheral wall 131. The silencer 17g has a silencing chamber 140, which is an internal space defined by the peripheral wall 131, the end wall 132, and the injection head 13.

[0066] The sound-absorbing chamber 140 accommodates a columnar first sound-absorbing material 134 provided at one end in the axial direction, a columnar second sound-absorbing material 135 provided at the other end in the axial direction, a cylindrical third sound-absorbing material 136 provided between the first sound-absorbing material 134 and the second sound-absorbing material 135, a circular end plate 141 supporting the first sound-absorbing material 134, a circular spacer 142, and a nut 143.

[0067] The first sound absorbing material 134 and the second sound absorbing material 135 are made of flat, columnar, porous metal. The first sound absorbing material 134 is attached and housed along the inner circumferential surface of one axial end of the peripheral wall 131, and is provided in contact with one surface of the end wall 132 facing the muffling chamber 140 and one axial end of the injection head 13.

[0068] An annular end plate 141 having a through hole 141a is provided on one end side of the first sound absorbing material 134 in the axial direction. The end plate 141 is provided in contact with the first sound absorbing material 134 and restricts the movement of the first sound absorbing material 134 towards the one end side in the axial direction. A third sound absorbing material 136 is provided on the one end side of the end plate 141 in the axial direction. In this embodiment, the third sound absorbing material 136 is the same as the above-mentioned absorbing material. The third sound absorbing material 136 is realized by the same material as the sound absorbing material 33 of the sound device 17. The third sound absorbing material 136 may be realized by a porous metal. The third sound absorbing material 136 is attached and housed along the inner circumferential surface of the peripheral wall 131.

[0069] An annular spacer 142 having a through hole 142a is provided on one end side in the axial direction of the third sound absorbing material 136. The spacer 142 is provided in contact with the second sound absorbing material 135, and maintains the distance between the third sound absorbing material 136 and the second sound absorbing material 135.

[0070] A second sound absorbing material 135 is provided on one end side in the axial direction of the spacer 142. In this embodiment, the second sound absorbing material 135 is formed in the same shape as the first sound absorbing material 134, but may be formed in a shape different from that of the first sound absorbing material 134. The second sound absorbing material 135 is attached and housed along the inner circumferential surface of the peripheral wall 131.

[0071] A nut 143 is provided on one end of the second sound-absorbing material 135 in the axial direction. The nut 143 has an external thread engraved on its outer periphery, and is tightened while being screwed into an internal thread engraved on the inner periphery on the open end side of the peripheral wall 131, supporting the second sound-absorbing material 135 while pressing it towards the other end in the axial direction. This restricts the sound-absorbing materials 134, 135, 136, as well as the end plate 141 and the spacer 142 from being displaced towards the one end in the axial direction.

[0072] In FIG. 14, the end face around the outlet end of the nozzle hole 16 in the nozzle portion 12 of the ejection head 13 where the nozzle hole 16 opens is formed on an imaginary plane perpendicular to the axis of the nozzle hole 16. The silencer 17g includes: (q) a cylindrical peripheral wall 131 having an axis extending along the axis of the nozzle hole 16, and forming an internal space 140 extending downstream in the injection direction of the extinguishing gas from the outlet of the nozzle hole 16; (r) an end wall 143 formed at one end of the peripheral wall 131 away from the nozzle portion 12 in the axial direction, defining the internal space 140 together with the peripheral wall 131, and having a through hole formed therethrough in the axial direction of the peripheral wall 131; (s) an attachment portion 133 formed at the other end of the peripheral wall 131 close to the nozzle portion 12 in the axial direction, and attached to the injection head 13; and (t) first, second and third sound absorbing materials 134, 135 housed in the internal space 140. , 136, which are made of porous metal, and a first sound absorbing material 134, a third sound absorbing material 136, and a second sound absorbing material 135 are arranged in the axial direction of the peripheral wall 131 from the nozzle portion 12 to the end wall 143. The first sound absorbing material 134 and the second sound absorbing material 135 are arranged in this order, and the first sound absorbing material 134 and the second sound absorbing material 135 are aligned with the axis of the peripheral wall 131. The third sound-absorbing material 136 is cylindrical with an axis coinciding with the axis of the peripheral wall 131, the end face of the first sound-absorbing material 134 close to the nozzle portion 12 is formed on an imaginary plane perpendicular to the axis of the first sound-absorbing material 134, the second sound-absorbing material 135 has an end face away from the nozzle portion 12, and by attaching the attachment portion 133 to the injection head 13, the end face away from the nozzle portion 12 of the second sound-absorbing material 135 comes into contact with the end wall 143 and contacts the nozzle portion 12 of the first sound-absorbing material 134. The end face of the first, second and third sound-absorbing materials 134, 135 and 136 which are close to each other are in surface contact with the end face of the nozzle portion 12, and these first, second and third sound-absorbing materials 134, 135 and 136 have fine gaps, and the extinguishing gas sprayed at high speed from the nozzle portion 12 of the spray head 13 is diffused by the first to third sound-absorbing materials 134, 135 and 136 contained in the internal space 140, and gradually decompresses and expands to reduce the flow velocity, absorbs vibrations of the sprayed flow of the extinguishing gas, and releases it from the through hole 122b into the space within the compartment to be extinguished.

[0073] According to this embodiment, the silencer 17g is provided to accommodate three sound absorbing materials. By providing the first sound absorbing material 134 immediately after the nozzle hole 16 in this manner, the silencer 17g can gradually reduce the pressure and expand the extinguishing gas supplied from the branch pipe 19 side, thereby reducing the flow rate. In addition, the third sound absorbing material 136 is provided, which can absorb acoustic vibrations caused by the jet flow of the extinguishing gas, thereby suppressing the generation of jet sounds caused by the jet of the extinguishing gas. In addition, the second sound absorbing material 135 is provided, which can absorb the extinguishing gas that has passed through the third sound absorbing material 136. The gas pressure can be further reduced and its flow rate can be reduced, which can further suppress the generation of injection noise caused by the injection of the extinguishing gas.

[0074] Fig. 15 is an enlarged cross-sectional view showing a silencer 17h provided in a gas fire extinguishing system according to still another embodiment of the present invention. The same reference numerals are used for parts corresponding to those in the above-mentioned embodiment. In this embodiment, the silencer 17h is attached via the injection head 13 to a branch pipe 19 provided on the wall surface of the compartment to be extinguished, for example.

[0075] The silencer 17h of this embodiment includes the injection head 13, a bottomed cylindrical casing 150, a nut 151 screwed into the opening of the casing 150, a cylindrical first sound-absorbing material 152 attached to the injection head 13, a cylindrical second sound-absorbing material 153 housed in the casing 150 and arranged along the inner circumferential surface of the casing 150, a circular annular first clamping piece 154 attached to the base end of the injection head 13 inside the casing 150, a disk-shaped second clamping piece 155 provided on the opening side of the casing 150 in contact with the end face of the injection head 13, and a disk-shaped third sound-absorbing material 156 supported and held by the nut 151 at the opening of the casing 150.

[0076] The casing 150 has a right cylindrical tube portion 157, a flange portion 158 that protrudes perpendicularly radially outward from one axial end of the tube portion 157, and an annular end wall portion 159 that extends radially inward from the other axial end of the tube portion 157. An external thread 160 is formed on the outer periphery of the flange portion 158. An insertion hole 161 into which the base end of the injection nozzle 13 is fitted is formed on the central axis of the end wall portion 159. Such a casing 150 is made of metal. The first to third sound absorbing materials 152, 153, 156 are made of the same porous metal as described above.

[0077] The nut 151 has a right cylindrical tube portion 162 and a flange portion 163 protruding radially inward from one axial end of the tube portion 162. An internal thread 164 is engraved on the inner peripheral surface of the other axial end of the tube portion 162, and is screwed onto the external thread 160 of the casing 150. Such a nut 151 is made of metal, and by tightening it while being screwed onto the external thread 160 of the casing 150, the peripheral portion of the third sound-absorbing material 156 is clamped by the flange portion 158 of the casing 150 and the flange portion 163 of the nut 151, and the second clamping piece 155 is clamped by the third sound-absorbing material 156 and an end wall portion 165 of the injection head 13, and the second sound-absorbing material 153 is prevented from slipping out of the casing 150.

[0078] The injection head 13 has an engagement portion 166 to which a fastening tool such as a wrench is engaged, a tubular portion 167 axially connected to the engagement portion 166, and an end wall portion 165 closing one axial end of the tubular portion 167. The tubular portion 157 is provided with nozzle holes 16 penetrating in the thickness direction at circumferential intervals, for example, every 90°. An external thread 168 is engraved on the base of the tubular portion 167 near the engagement portion 166. An internal thread 169 engraved on the inner peripheral portion of the first clamping piece 154 is screwed into the external thread 168, and the end wall portion 159 of the casing 150 is clamped between the second clamping portion 155 and the engagement portion 166, and the injection head 13 is fixed to the casing 150 on the same axis. As described above, the first sound absorbing material 152 is attached to the injection head 13, i.e., attached to the cylindrical portion 12 inside the casing 150, and is held in a state of being clamped from both sides in the axial direction by the first and second clamping pieces 154, 155. In this type of sound absorbing device 17h, an annular space 170 is formed between the first sound absorbing material 152 and the second sound absorbing material 153, spanning the end wall portion 159 of the casing 150 and the third sound absorbing material 156.

[0079] The high pressure extinguishing gas supplied to the injection head 13 from the branch pipe 19 is injected into the first sound absorbing material 152 from each nozzle hole 16 of the injection head 13, and the shock wave is rapidly diffused and decelerated, thereby preventing the generation of strong turbulence accompanied by the shock wave and reducing noise. The extinguishing gas discharged from the second sound absorbing material 152 into the space 170 penetrates the second sound absorbing material 153, where it is rapidly diffused and decelerated in the same manner as the first sound absorbing material 152, and is reflected by the inner peripheral surface of the tube portion 150 toward the third sound absorbing material 156. The extinguishing gas that penetrates into the third sound absorbing material 156 diffuses and loses speed before rapidly expanding in the same manner as the first and second sound absorbing materials 152 and 153 described above, which further attenuates the sound and allows the injection sound caused by the injection of the extinguishing gas to be significantly reduced.

[0080] 15, the jet head 13 is connected to an end of the conduit 14 and extends along the axis of the end, with a cylindrical portion 167 having a plurality of nozzle holes 16 formed therethrough in the thickness direction, and an end wall portion 165 closing one axial end of the cylindrical portion 167 away from the end of the conduit 14. The silencer 17h includes: (u) a first sound-absorbing material 152 formed in a cylindrical shape, through which the cylindrical portion 167 of the jet head 13 is inserted, and having an inner circumferential surface that is in surface contact with the arc-shaped end surface around the outlet end of the nozzle hole 16, which is the outer circumferential surface of the cylindrical portion 167 of the jet head 13; (v) a casing 150 including: (v1) a cylindrical portion 157 extending along the axis of the cylindrical portion 167 of the jet head 13 and surrounding the first sound-absorbing material 152 at a distance in the radial direction; and (v2) an end wall portion 165 closing one axial end of the cylindrical portion 167 away from the end of the conduit 14. (w) a second sound-absorbing material 153 formed in a cylindrical shape, arranged along the inner peripheral surface of the cylindrical portion 157, and forming an annular space 170 between itself and the outer peripheral surface of the first sound-absorbing material 152; and (x) a third sound-absorbing material 156 arranged at an end of the cylindrical portion 157 of the casing 150 remote from the end of the conduit 14, for discharging the extinguishing gas from the annular space into a space within the compartment to be extinguished. (y) These first, second and third sound-absorbing materials 152, 153 and 156 have minute gaps, and diffuse the extinguishing gas sprayed at high speed from the nozzle portion 12 of the spray head 13, gradually reducing the pressure and expanding the gas, thereby reducing the flow rate and absorbing vibrations of the sprayed flow of the extinguishing gas.

[0081] In the embodiment shown in Figure 15, a plurality of injection nozzles 16 are formed perpendicular to the axis of the tubular portion 12 of the injection head 13, and the extinguishing gas is injected radially outward. However, in still another embodiment of the present invention, the tubular portion of the injection head 13 may be formed with nozzle holes 16 inclined toward the opening of the casing 150, and the gas that has passed through the first sound-absorbing material 152 may be released directly toward the third sound-absorbing material 156, and a similar effect can be achieved.

[0082] The present invention can be embodied in the following ways. (1) An injection head having a nozzle portion for injecting high-pressure fire extinguishing gas into a space; a duct to which the injection head is connected and which introduces high-pressure fire extinguishing gas to the injection head; a fire extinguishing gas supply source for supplying high pressure fire extinguishing gas to the duct; and a sound-absorbing device provided on the injection head for attenuating sound generated by the discharge of the extinguishing gas from the nozzle portion.

[0083] (2) The silencer includes a cylindrical peripheral wall, an end wall formed at one axial end of the peripheral wall perpendicular to the axis of the peripheral wall, and an attachment portion formed at the other axial end of the peripheral wall so as to be detachable from the injection head, A gas fire extinguishing system, characterized in that a peripheral wall has a plurality of ventilation holes formed therein so as to penetrate the peripheral wall in a thickness direction thereof. The silencer has a peripheral wall, an end wall, and an attachment part, and is detachably attached to the injection head by the attachment part. By configuring the silencer in this way, the extinguishing gas injected from the nozzle part of the injection head collides with the end wall and is then released to the outside through a plurality of through holes formed in the peripheral wall, thereby suppressing the generation of loud injection noise.

[0084] (3) The silencer includes a cylindrical peripheral wall, an end wall formed at one axial end of the peripheral wall perpendicular to the axis of the peripheral wall, and an attachment portion formed at the other axial end of the peripheral wall so as to be detachable from the injection head, and a plurality of vent holes are formed in the end wall so as to penetrate the end wall in a thickness direction. This is a gas fire extinguishing system.

[0085] The silencer includes a peripheral wall, an end wall, and a mounting portion, and is removably attached to the injection head by the mounting portion. The extinguishing gas injected at high speed from the nozzle of the injection head passes through the space in the peripheral wall, collides with the end wall, and is then released to the outside through a plurality of through holes formed in the end wall. This configuration of the silencer also prevents the generation of loud injection noise when the extinguishing gas is injected.

[0086] (4) A gas fire extinguishing system characterized in that the internal space defined by the peripheral walls, end walls and mounting parts contains sound-absorbing material.

[0087] Since a sound-absorbing material is contained in the internal space defined by the peripheral wall, end wall and mounting portion of the silencer, the vibration of the jet of fire extinguishing gas is absorbed by this sound-absorbing material, thereby further preventing the generation of jet noise.

[0088] (5) The silencer includes a cylindrical peripheral wall, an end wall formed at one axial end of the peripheral wall perpendicular to the axis of the peripheral wall, an attachment portion at the other axial end of the peripheral wall integrally with an injection head, and an inner cylinder provided at a portion of the nozzle portion of the injection head facing downstream in the injection direction of the extinguishing gas, The end wall is formed with a gas ejection hole penetrating in the thickness direction thereof, A gas fire extinguishing system characterized in that the inner cylinder has a cylindrical portion in which a plurality of through holes are formed, and an end plate formed perpendicular to the axis of the cylindrical portion at one axial end of the cylindrical portion.

[0089] The extinguishing gas injected at high speed from the nozzle of the injection head collides with the cylindrical end plate of the inner cylinder and is released from multiple through holes formed in the cylindrical part, then passes through the space between the cylindrical part and the peripheral wall and is released to the outside from the gas release hole formed in the end wall. This prevents the generation of injection noise when the extinguishing gas is released.

[0090] (6) An injection head having a nozzle portion for injecting high-pressure fire extinguishing gas into a space; a duct to which the injection head is connected and which introduces high-pressure fire extinguishing gas to the injection head; a fire extinguishing gas supply source for supplying high pressure fire extinguishing gas to the duct; A gas fire extinguishing system, characterized in that a nozzle hole having an inner circumferential surface that smoothly connects to the inner circumferential surface of the conduit is formed in the nozzle portion of the injection head.

[0091] High-pressure extinguishing gas supplied from a fire extinguishing gas supply source to a conduit is sprayed through a spray head toward a space inside a building, etc. Such a spray head is formed with a nozzle hole having an inner circumferential surface that smoothly connects to the inner circumferential surface of the conduit, so that the generation of a loud spray sound due to the high-speed spray flow of the extinguishing gas from the nozzle part of the spray head is prevented.

[0092] (7) An injection head having a nozzle portion for injecting high-pressure fire extinguishing gas into a space; a duct to which the injection head is connected and which introduces high-pressure fire extinguishing gas to the injection head; a fire extinguishing gas supply source for supplying high pressure fire extinguishing gas to the duct; A gas fire extinguishing system comprising a sound silencing device provided between the injection head and the conduit for attenuating sound generated by the discharge of fire extinguishing gas from the nozzle portion.

[0093] The high-pressure extinguishing gas supplied from the extinguishing gas supply source to the duct is sprayed into the space inside the building through the spray head. A silencer is provided between the spray head and the duct to prevent the generation of loud jet noise caused by the high-speed jet of extinguishing gas from the nozzle of the spray head.

[0094] (8) The silencer includes a cylindrical peripheral wall, a first mounting portion formed at one axial end of the peripheral wall so as to be detachable from a conduit, a second mounting portion formed at the other axial end of the peripheral wall so as to be detachable from the injection head, a first end wall formed at the one end perpendicular to the axis of the peripheral wall, and a second end wall formed at the other end perpendicular to the axis of the peripheral wall, At least one through hole is formed in the first end wall in a central portion of the first end wall about the axis of the peripheral wall, penetrating the first end wall in a thickness direction thereof, A gas fire extinguishing system, characterized in that a plurality of through holes are formed in the second end wall so as to penetrate the second end wall in a thickness direction thereof.

[0095] The silencer has a peripheral wall, first and second end walls, and first and second mounting parts, and is detachably mounted between the injection head and the conduit by the first and second mounting parts. The extinguishing gas supplied from the conduit and injected at high speed from a through hole formed in the first end wall collides with the center of the second end wall inside the silencer, and is then released from the through holes formed in the second end wall into a space defined by the second end wall and the injection head, and is then released from the injection head to the outside. The silencer reduces the flow velocity at the through holes formed in the second end wall by expanding the extinguishing gas injected at high speed from the through holes formed in the first end wall in the space inside the silencer, thereby suppressing the generation of sound caused by the extinguishing gas being released from the injection head.

[0096] (9) The silencer includes a cylindrical peripheral wall, a first mounting portion formed at one axial end of the peripheral wall so as to be detachably attached to a conduit, a second mounting portion formed at the other axial end of the peripheral wall so as to be detachably attached to the injection head, a first end wall formed at the one end perpendicular to the axis of the peripheral wall, and a second end wall formed at the other end perpendicular to the axis of the peripheral wall, A guide portion having a plurality of nozzle holes for ejecting high-pressure fire extinguishing gas supplied from a conduit into an internal space defined by the peripheral wall, the first end wall, and the second end wall is formed on the axis of the peripheral wall facing the internal space, and the plurality of nozzle holes are formed on an axis perpendicular to the axis of the peripheral wall and spaced at equal angles in the circumferential direction with respect to the axis of the peripheral wall, A gas fire extinguishing system, characterized in that a plurality of through holes are formed in the second end wall so as to penetrate the second end wall in a thickness direction thereof.

[0097] The silencer has a peripheral wall, first and second end walls, and first and second mounting parts, and is detachably mounted between the injection head and the conduit by the first and second mounting parts. The extinguishing gas supplied from the conduit and injected at high speed from the nozzle hole of the guide part formed in the first end wall collides with the inner peripheral surface of the peripheral wall inside the silencer, and is then released from the multiple through holes formed in the second end wall into a space defined by the second end wall and the injection head, and then released from the injection head to the outside. The silencer reduces the flow velocity at the through holes formed in the second end wall by expanding the extinguishing gas injected at high speed from the nozzle hole of the guide part formed in the first end wall in the space inside the silencer, thereby suppressing the generation of sound caused by the extinguishing gas being released from the injection head.

[0098] (10) The silencing device includes a cylindrical peripheral wall, a first end wall formed perpendicular to the axis of the peripheral wall at one axial end of the peripheral wall, a second end wall having an attachment portion formed so as to be detachable from the injection head and formed perpendicular to the axis of the peripheral wall at the other axial end of the peripheral wall, a barrier formed perpendicular to the axis of the peripheral wall between the first end wall and the second end wall, a cylindrical conduit for guiding the extinguishing gas injected from the injection head to a first silencing chamber which is an internal space defined by the peripheral wall, the first end wall and the barrier, and a cylindrical vent pipe for guiding the extinguishing gas in the second silencing chamber which is an internal space defined by the peripheral wall, the second end wall and the barrier to the outside, The barrier has a plurality of through holes formed therethrough in a thickness direction of the barrier, a connecting portion is formed at one axial end of the conduit, the connecting portion being detachably connected to the injection head, and an end plate is formed at the other axial end of the conduit, a plurality of through holes are formed in a portion of the peripheral wall of the conduit protruding into the first silencing chamber, the through hole extending in the thickness direction of the peripheral wall of the conduit, and a vent pipe is disposed so as to penetrate the barrier and the first end wall.

[0099] The muffler includes a peripheral wall, a first barrier, a second end wall having an attachment portion, and a barrier, and is detachably attached to the injection head by the attachment portion. The extinguishing gas injected at high speed into the first muffler chamber from a plurality of through holes formed in the conduit connected to the injection head by the connection portion is discharged into the second muffler chamber from a plurality of through holes formed in the barrier. The extinguishing gas discharged into the second muffler chamber is discharged to the outside of the muffler through the vent pipe. The muffler reduces the flow velocity in the vent pipe by expanding the extinguishing gas injected at high speed from a plurality of through holes formed in the conduit in the space in the first muffler chamber and the space in the second muffler chamber, thereby suppressing the generation of sound caused by the extinguishing gas discharged from the vent pipe.

[0100] (11) A silencing device includes a cylindrical peripheral wall, a first end wall formed perpendicular to the axis of the peripheral wall at one axial end of the peripheral wall, a second end wall having an attachment portion detachably formed on the injection head and formed perpendicular to the axis of the peripheral wall at the other axial end of the peripheral wall, a barrier formed perpendicular to the axis of the peripheral wall between the first end wall and the second end wall, a cylindrical conduit for guiding the extinguishing gas sprayed from the injection head to a first silencing chamber which is an internal space defined by the peripheral wall, the first end wall, and the barrier, and a plurality of cylindrical vent pipes for guiding the extinguishing gas in the second silencing chamber which is an internal space defined by the peripheral wall, the second end wall, and the barrier to the outside, The barrier has a plurality of through holes formed therethrough in a thickness direction of the barrier, The conduit has a connecting portion at one axial end thereof that is detachably connected to the injection head, and an end plate at the other axial end thereof, and a plurality of through holes are formed in a portion of the peripheral wall of the conduit that protrudes into the first silencing chamber, penetrating the peripheral wall of the conduit in a thickness direction thereof, A gas fire extinguishing system characterized in that a plurality of vent pipes are arranged on an axis perpendicular to the axis of the peripheral wall, spaced at equal angles circumferentially with respect to the axis of the peripheral wall, and each of the vent pipes is formed to penetrate the peripheral wall.

[0101] The muffler includes a peripheral wall, a first barrier, a second end wall having an attachment portion, and a barrier, and is detachably attached to the injection head by the attachment portion. The extinguishing gas injected at high speed into the first muffler chamber from a plurality of through holes formed in the conduit connected to the injection head by the connection portion is discharged into the second muffler chamber from a plurality of through holes formed in the barrier. The extinguishing gas discharged into the second muffler chamber is discharged to the outside of the muffler through the vent pipe. The muffler reduces the flow velocity in the vent pipe by expanding the extinguishing gas injected at high speed from a plurality of through holes formed in the conduit in the space in the first muffler chamber and the space in the second muffler chamber, thereby suppressing the generation of sound caused by the extinguishing gas discharged from the vent pipe.

[0102] (12) A gas fire extinguishing system characterized in that the silencer includes a cylindrical peripheral wall, an end wall formed at one axial end of the peripheral wall perpendicular to the axis of the peripheral wall, an attachment portion formed in a detachable manner on the injection head, and a sound-absorbing material made of a porous metal contained in an internal space defined by the peripheral wall, the end wall, and the injection head.

[0103] The sound absorbing material is made of porous metal and is housed in the internal space. By providing such a sound absorbing material immediately after the nozzle hole, the extinguishing gas supplied from the branch pipe is gradually decompressed and expanded, and its flow speed is reduced. This makes it possible to suppress the generation of injection noise caused by the injection of the extinguishing gas.

[0104] (13) A gas fire extinguishing system, characterized in that the sound-absorbing material of the sound-absorbing device includes a first sound-absorbing material provided at one axial end of the peripheral wall and a second sound-absorbing material provided at the other axial end.

[0105] The sound absorbing material includes a first sound absorbing material provided at one axial end of the peripheral wall and a second sound absorbing material provided at the other axial end. Therefore, the extinguishing gas supplied from the branch pipe immediately after the nozzle hole is gradually decompressed and expanded by the first sound absorbing material, and the flow velocity of the extinguishing gas can be reduced. In addition, the second sound absorbing material can further reduce the pressure and expand the extinguishing gas, thereby slowing down its flow rate, thereby further suppressing the generation of injection noise caused by the injection of the extinguishing gas.

[0106] (14) A gas fire extinguishing system, characterized in that the sound-absorbing device further includes a third sound-absorbing material provided between the first sound-absorbing material and the second sound-absorbing material.

[0107] A third sound-absorbing material is provided between the first and second sound-absorbing materials, so that the third sound-absorbing material can absorb acoustic vibrations caused by the jet flow of the extinguishing gas and suppress the generation of jet sounds caused by the jet of the extinguishing gas.

[0108] In addition, since the injection head is formed with a nozzle hole having an inner surface that smoothly connects to the inner surface of the conduit, it is possible to prevent a loud injection sound from being generated even when extinguishing gas is injected from the nozzle portion of the injection nozzle in the event of a fire.

[0109] In addition, since a silencer is provided between the injection head and the duct, it is possible to prevent a loud injection sound from being generated even when the extinguishing gas is injected from the nozzle portion of the injection nozzle in the event of a fire. [Explanation of symbols]

[0110] 11 Gas injection section 12 Nozzle section 13,50,50a Injection head 14 Conduit 15 Fire extinguishing gas supply source 16,71 Nozzle hole 17,17a~17h,60,60a Silencer 18 Branch Pipe 19 Branch pipe 20 Foundations 21 Bracket 22 Fasteners 23 Master 25,35,41,61,81 Peripheral wall 26,36,42,64,64a,65,82,84 End walls 27,37,43,62,63,83,123 Mounting part 28 Downstream side of the injection direction 29 Inner cylinder 30,66,67,851,874 Through hole 31 Cylindrical section 32,872 end plate 33 Sound absorbing material 34 Gas release hole 38,44 Ventilation holes 39,45 Interior space 40,46 Sound absorbing material 51,52 Inner surface 55 Edge portion 72 Guide portion 85 Barrier 86,88 Soundproofing room 87 Conduction pipe 89, 89a Vent pipe 125 Sound absorbing material 134 First sound absorbing material 135 Second sound absorbing material 136 Third Sound Absorbing Material 871 Connecting part 891 Wire Mesh 892,892a Fire extinguishing gas nozzle D1,D2 Inner diameter

Claims

[Claim 1] an injection head (13) having a nozzle hole (16) extending along the conduit axis at the end of the conduit; and a sound absorbing material (125) provided immediately behind the nozzle hole (16), The sound-absorbing material is made of a porous metal and can gradually reduce the pressure and expand the extinguishing gas, thereby reducing its flow rate, thereby suppressing the generation of injection noise caused by the injection of the extinguishing gas. a sound-absorbing chamber is provided downstream of the nozzle hole, and the sound-absorbing material is packed tightly in the sound-absorbing chamber; The sound absorbing material has one end surface (125b) on a side farther from the nozzle hole, another end surface (125c) on a side closer to the nozzle hole, and a peripheral surface located between the one end surface and the other end surface, a member separate from the ejection head, the member contacting the one end surface to support the sound absorbing material and screwed to the ejection head; The sound-extinguishing chamber is configured so that extinguishing gas is injected from the one end face side and extinguishing gas is not injected from the other end face side, and a large amount of high-pressure extinguishing gas supplied from a fire extinguishing gas supply source through the conduit is injected from the injection head, and the injection head fits into the outer peripheral surface of the conduit.

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