JP2021028000A - Jet head - Google Patents

Abstract

To provide a gas fire extinguishing device capable of attenuating sound caused by jet flow of fire extinguishing gas from a jet head, and being easy to accurately adjust properties of jet and sound attenuation.SOLUTION: A jet head body 101 is configured by a nozzle member 339 provided at the jet head body 101 which is connected to a conduit 14 for introducing fire extinguishing gas. A sound attenuation means 102 comprises a second sound attenuation material 108 in which plural pieces of disc-shaped materials comprising a porous material are laminated. The second sound attenuation material 108 is held and fixed between an engagement part 138 of the jet head body 101 and a pressing member 128 by an attachment member 127. A peripheral surface 124 of the second sound attenuation material 108 is released to the atmosphere.SELECTED DRAWING: Figure 3

Description

The present invention relates to a gas fire-extinguishing system with fire extinguishing gas spray device and it extinguished by releasing extinguishing gas such as N ₂ gas or the halide gas in the space in the fire fighting target segments of the building in the event of a fire as a fire extinguishing agent More specifically, the present invention relates to a fire extinguishing gas injection device and a gas fire extinguishing device provided with the fire extinguishing gas injection device, which can be suitably implemented to reduce the loud sound generated when the fire extinguishing gas is injected from the injection head provided in the fire extinguishing target section. ..

Conventionally, various buildings have been equipped with gas fire extinguishing devices for extinguishing fires by releasing fire extinguishing gases such _{as CO 2} gas, N ₂ gas and halide gas as fire extinguishing agents into the space in the fire extinguishing target section.

FIG. 31 is a perspective view showing a part of the configuration including the injection head 3 of the gas fire extinguishing device of the prior art. The high-pressure fire extinguishing gas supplied from the fire extinguishing gas supply source 2 at the time of a fire is guided to the conduit 4 and injected from the injection head 3 connected to the conduit 4.

In the conduit 4, the main pipe 5 connected to the fire extinguishing gas supply source 2, the branch pipe 6 interposed in the main pipe 5, and the branch pipe 6 guide the fire extinguishing gas from the main pipe 5, and the injection head 3 is connected. It has a branch pipe 7. The main pipe 5 is fastened to the skeleton of a building or a base 8 and a bracket 9 fixed to the skeleton by fasteners 10 such as U bolts, and is installed in a state where vibration and displacement of the injection head 3 are suppressed ( For example, see Patent Document 1).

In the prior art, since a large amount of high-pressure fire extinguishing gas supplied from the fire extinguishing gas supply source 2 via the conduit 4 is injected from the injection head 3, the height is high from the nozzle hole 716 formed in the nozzle portion 712 of the injection head 3. There is a problem that the fire extinguishing gas flow injected at a high speed generates a loud sound that cuts through the air.

In another conventional technique for solving this problem (see, for example, Patent Document 2), a sound deadening means made of a sound deadening material made of a porous material is provided at an outlet portion of an orifice for injecting a fire extinguishing gas. Is an integral structure that extends in the axial direction of the orifice and is thickly formed, or is composed of two stacked divided structures that extend in the axial direction of the orifice and are thickly formed.

A new problem with this prior art is that it accurately characterizes various types of injection and muffling, depending on the flow rate, pressure, and degree of muffling of the fire extinguishing gas injected into the space within the fire extinguishing area. It is difficult to adjust and obtain.

Japanese Unexamined Patent Publication No. 8-173565 Japanese Patent No. 5276728

An object of the present invention is an extinguishing gas injection device capable of attenuating sound caused by an injection flow of fire extinguishing gas from an injection head, and easily adjusting various injection and sound extinguishing characteristics accurately. It is to provide a gas fire extinguishing device equipped with it.

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas toward a space in a fire extinguishing target section in a building. The fire extinguishing gas injection device emits sound from an injection head and the emission of fire extinguishing gas from the injection head. It has a muffling means for dampening, and the muffling means has a first muffling member provided on the injection head side and a second muffling member provided on the downstream side of the first muffling member. Each of the first and second muffling members is formed in a flat plate shape and is made of a porous material through which gas can flow.

In the fire extinguishing gas injection device configured in this way, it is possible to appropriately change the injection and sound deadening characteristics by changing the number of laminated layers, as compared with the case where the sound deadening material is composed of cylindrical blocks.

Preferably, the first and second sound deadening members are laminated to form a cylindrical or cylindrical shape.

Preferably, the first and second muffling members have the same outer diameter.
Preferably, the first and second muffling members have the same thickness.

Preferably, the entire outer peripheral surface of the first and second sound deadening members is exposed to the atmosphere.
Preferably, an annular or plate-shaped pressing member for fixing the second sound deadening member is further provided.

Preferably, the muffling means has a first muffling means located on the upstream side and a second muffling means located on the downstream side, and a gas is between the first muffling means and the second muffling means. Intermediate members that can be distributed are arranged.

The gas fire extinguishing device includes any of the above-mentioned fire extinguishing gas injection devices, a conduit for guiding a high-pressure fire extinguishing gas to the fire extinguishing gas injection device, and a fire extinguishing gas supply source for supplying the high-pressure fire extinguishing gas to the conduit. ..

It is a perspective view which shows a part structure including the injection head 100 and the sound extinguishing means 102 of the gas fire extinguishing apparatus of one Embodiment of this invention. It is a perspective view which shows the injection head 100 and the sound deadening means 102 of FIG. It is sectional drawing which shows the injection head 100 and the sound deadening means 102 of FIG. It is a partial enlarged cross-sectional view which shows the state which the guide member 121 is sandwiched by a mounting auxiliary member 103 and a 2nd sound deadening material 108. It is sectional drawing which shows the injection head 700 and the sound deadening means 701, 701a which the experiment was performed by the present inventor. It is a figure which shows the time passage of the sound pressure level obtained when the present inventor released a fire extinguishing gas by the structure of FIG. It is sectional drawing which shows the injection head 500 and the sound deadening means 502, 502a which the experiment was performed by the present inventor. It is a figure which shows the time passage of the sound pressure level obtained when the present inventor released a fire extinguishing gas by the structure of FIG. It is sectional drawing which shows the gas fire extinguishing apparatus of another embodiment of this invention. It is a perspective view which shows a part structure including the injection head 200 and the sound extinguishing means 202 of the gas fire extinguishing apparatus of one Embodiment of this invention. It is a perspective view which shows the injection head 200 and the sound deadening means 202 of FIG. It is sectional drawing which shows the injection head 200 and the sound deadening means 202 of FIG. It is a partial enlarged cross-sectional view which shows the state which the guide member 221 is sandwiched by the injection head main body 201 and the sound deadening material 208. It is sectional drawing which shows the injection head 500 and the sound deadening means 502, 502a which the experiment was performed by the present inventor. It is a figure which shows the time passage of the sound pressure level obtained when the present inventor released a fire extinguishing gas by the structure of FIG. It is sectional drawing which shows the gas fire extinguishing apparatus of another embodiment of this invention. It is a perspective view which shows a part structure including the injection head 300 and the sound extinguishing means 302 of the gas fire extinguishing apparatus of one Embodiment of this invention. It is a perspective view which shows the injection head 300 and the sound deadening means 302 of FIG. It is sectional drawing which shows the injection head 300 and the sound deadening means 302 of FIG. It is sectional drawing which shows the injection nozzle 500 and the sound deadening means 502, 502a which the experiment was performed by the present inventor. It is a figure which shows the time passage of the sound pressure level obtained when the present inventor released a fire extinguishing gas by the structure of FIG. It is a perspective view which shows a part structure including the injection head 400 and the sound extinguishing means 402 of the gas fire extinguishing apparatus of one Embodiment of this invention. It is a perspective view which shows the injection head 400 and the sound deadening means 402 of FIG. It is sectional drawing which shows the injection head 400 and the sound deadening means 402 of FIG. It is a partial enlarged cross-sectional view which shows the state which the guide member 421 is sandwiched by a mounting auxiliary member 403 and a sound deadening material 408. It is sectional drawing which shows the injection head 700 and the sound deadening means 701, 701a which the experiment was performed by the present inventor. It is a figure which shows the time passage of the sound pressure level obtained when the present inventor released a fire extinguishing gas by the structure of FIG. It is sectional drawing which shows the injection head 500 and the sound deadening means 502, 502a which the experiment was performed by the present inventor. It is a figure which shows the time passage of the sound pressure level obtained when the present inventor released a fire extinguishing gas by the structure of FIG. 28. It is sectional drawing which shows the gas fire extinguishing apparatus of another embodiment of this invention. It is a perspective view which shows a part structure including the injection head 3 of the gas fire extinguishing apparatus of the prior art.

FIG. 1 is a perspective view showing a part of a configuration including an injection head 100 and a sound extinguishing means 102 of the gas fire extinguishing apparatus according to the embodiment of the present invention. The gas fire extinguishing device of the present embodiment is provided in a fire extinguishing target section of a building, and an injection head 100 for injecting high-pressure fire extinguishing gas toward a space in the fire extinguishing target section is connected to the injection head 100. Injection from a conduit 14 that guides a high-pressure fire extinguishing gas to 100, a fire extinguishing gas supply source 15 that supplies high-pressure fire extinguishing gas to the conduit 14, and a nozzle hole 104 (see FIG. 3 described later) formed in the injection head 100. It includes a muffling means 102 that attenuates the sound generated due to the injection of the extinguishing gas.

The fire extinguishing gas is realized by a non-combustible gas such as _{N 2} gas, CO _{2 gas and halide gas.} Such fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target section having a fire extinguishing gas reach of 15 m or more, and the space in the fire extinguishing target section is uniformly reached to a predetermined fire extinguishing agent concentration in a short time. You can let it extinguish the fire.

The injection head 100 and the muffling means 102 form a fire extinguishing gas injection unit 111. In such a fire extinguishing gas injection unit 111, the fire extinguishing gas is supplied from the fire extinguishing gas supply source 15 to the injection head 100 via the conduit 14. The conduit 14 is a main pipe 2 connected to a fire extinguishing gas supply source 15.
3. The high-pressure fire extinguishing gas from the fire extinguishing gas supply source 15 is injected through the conduit 14 including the branch pipe 18 interposed in the main pipe 23 and the branch pipe 19 connected to the branch pipe 18. It is guided by the head 100. The conduit 14 is fastened to the base 20 and the 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.

FIG. 2 is a perspective view showing the injection head 100 and the muffling means 102, and FIG. 3 is a cross-sectional view showing the injection head 100 and the muffling means 102. The injection head 100 having a sound extinguishing function is installed on the wall in order to release the fire extinguishing gas to the fire extinguishing target section in the gas-based fire extinguishing equipment using the fire extinguishing gas, and the sound extinguishing means 102 is attached to the injection head main body 101 by the attachment auxiliary member 103. It is composed of. A nozzle hole 104, which is a choke, is directly formed in the injection head main body 101. The nozzle hole 104 limits the flow rate of the fire extinguishing gas to a desired value.

The mounting auxiliary member 103 has a base portion 105 and an outward flange 106 connected to the base portion 105. The base 105 is detachably attached to the injection head body 101 by screws 107.

The sound deadening means 102 is composed of first and second sound deadening materials 113 and 108 made of a porous material through which gas can flow. The second sound deadening material 108 has a large diameter, and the first sound deadening material 113 has a smaller diameter than the second sound deadening material 108. Each of the plurality of members of the first and second sound deadening materials 113 and 108 has a thin disk shape and a thin annular shape, and these members are laminated. The overall shape of the laminated first sound deadening material 113 and the second sound deadening material 108 is substantially columnar, respectively.

A rectifying member 109 is attached to the attachment auxiliary member 103 by a screw 110. The rectifying member 109 has a rectifying hole 112 which is a choke. The above-mentioned first sound deadening material 113 made of a porous material through which gas can flow is housed in the rectifying member 109. The first sound deadening material 113 has a plurality of members each having a thin disk-like shape, and these members are laminated. The rectifying hole 112 does not have a function of limiting the flow rate of the fire extinguishing gas, but functions to disperse and rectify the decelerated and decompressed fire extinguishing gas by the first sound deadening material 113 and lead to the next second sound deadening material 108. .. An annular member 114 is interposed between the end surface of the outward flange 106 of the mounting auxiliary member 103 and the first sound deadening material 113. The annular member 114 forms a gap 115 between the injection head main body 101 and the first sound deadening material 113 to retain and store foreign matter such as fine rust from the nozzle hole 104, whereby the foreign matter in the nozzle hole 104 is formed. Prevent clogging.

FIG. 4 is a partially enlarged cross-sectional view showing a state in which the guide member 121 is sandwiched between the mounting auxiliary member 103 and the second sound deadening material 108. The end surface 120 on one side (left side in FIGS. 2 and 3) of the second sound deadening material 108 is arranged in contact with the annular mounting portion 122 of the guide member 121 and facing the outward flange 106 of the mounting auxiliary member 103. Will be done. The guide member 121 has a mounting portion 122 and a short tubular guide portion 123 that is connected to the mounting portion 122 and guides the fire extinguishing gas.

The peripheral surface 124 of the second sound deadening material 108 and the end surface 125 on the other side (right side of FIGS. 2 and 3) fix the second sound deadening material 108 to the outward flange 106 of the mounting auxiliary member 103 via the mounting member 127. It is open to the atmosphere except for the portion in contact with the pressing member 128 as the ring member. The shaft portion of the mounting member 127 is screwed to the outward flange 106 of the mounting auxiliary member 103 through the pressing member 128 (ring member, annular member), the second sound deadening material 108, and the mounting portion 122 of the guide member 121. To.

As shown in FIG. 4, the mounting portion 122 of the guide member 121 fits into the mounting seat 131 formed by being annularly recessed in the outward flange 106 of the mounting auxiliary member 103, and is radially inward from the mounting seat 131. It rises by the gap ΔL1 from the end face 132 (lower part of FIG. 4).

With reference to FIG. 3 again, in the injection head 100, the injection head main body 101 has a base portion 137 and an engaging portion 138 connected to the base portion 137. The base portion 137 of the injection head 100 is detachably connected to the end portion 14a of the conduit 14 by a first screw 112 which is a taper screw.

The mounting auxiliary member 103 is detachably and replaceably provided on the base portion 137 of the injection head main body 101. Various injection head main bodies 101 having different diameters of the nozzle holes 104 are individually selected and used depending on the length of the conduit 14 and the like. The reason will be described. The gas fire extinguishing device should quickly fill the space in the fire extinguishing area with fire extinguishing gas while ensuring a large flow rate (for example, 20,000 to 100,000 liters / minute) required for fire extinguishing, which is its original role. It must be configured to ensure a high flow velocity (eg 100 m / s) to release the extinguishing gas. Therefore, the Fire Fighting Law Enforcement Regulations stipulate that the radiation pressure of the fire extinguishing gas from the nozzle hole 104 of the injection head 100 in the gas fire extinguishing device is 1.9 MPa or more, and in practice, it is 2 to 3 MPa (≈20 to 30 kgf /). cm ^2, Note, carried out at high radiation pressures further to as high 6MPa ≒ 60kgf / cm ^2).

Therefore, the value of the diameter of the nozzle hole 104 of the injection head 100 is such that the fire extinguishing gas injected from the nozzle hole 104 achieves the above-mentioned large flow rate, high flow velocity, and high radiation pressure from the fire extinguishing gas supply source 15. It must be set depending on the length of the conduit 14 to the 100 installation location and therefore the conduit resistance.

Therefore, the diameter of the nozzle hole 104 differs depending on the length of the conduit 14, and therefore, various injection heads 100 having different diameters of the nozzle hole 104 are individually selected and used for each installation location of the injection head 100. Must. As described above, in the gas fire extinguishing device, various injection heads 100 having different diameters of the nozzle holes 104 are indispensable.

The sound deadening means 102 includes a first sound deadening material 113, a second sound deadening material 108, a pressing member 128, and a mounting member 127. The first and second sound deadening materials 113 and 108 are made of a porous material through which a gas can flow, and are made of a porous metal obtained by sintering, for example, fine metal powder or fine metal strips, and are made of a second sound deadening material. The fine voids of the material 108 are smaller than the voids of the first sound deadening material 113, and it is possible to effectively realize the sound deadening effect without lowering the flow rate by smooth and slow decompression and expansion of the high pressure fire extinguishing gas. The first sound deadening material 113 and the second sound deadening material 108 correspond to the flow conditions of the fire extinguishing gas such as the diameter and length of the nozzle holes 104 and the rectifying holes 112, the number and formation positions of the nozzle holes 104 rectifying holes 112, and the like. Therefore, porous materials having different density of voids can be appropriately selected and used. Further, the first and second sound deadening materials 113 and 108 may be formed by laminating a plurality of layers of wire mesh, for example, or may be a plate-shaped molded product or a porous member made of synthetic resin fibers.

The first and second sound deadening materials 113 and 108 are formed in the shape of a flat plate such as a disk, the second sound deadening material 108 has a larger diameter than the first sound deadening material 113, and a plurality of sheets are laminated. .. Each of the overall shapes of the laminated first and second sound deadening materials 113 and 108 is, for example, a columnar shape. The end surface 120 on one side (left side in FIG. 3) of the laminated second sound deadening material 108 in the axial direction faces the right side in FIG. 3 in the engaging portion 138 in which a tool such as a spanner of the injection head main body 101 is engaged. Then, for example, the peripheral surface 124 of the second sound deadening material 108, which is arranged in contact with each other and laminated, is opened to the atmosphere.

The pressing member 128 presses the end surface 125 on the other side (right side in FIG. 3) of the laminated second sound deadening material 108. The pressing member 128 has a flat plate shape and has a peripheral surface 124 extending along the peripheral surface 124 of the second sound deadening material 108.

The mounting member 127 is, in this embodiment, a bolt as a threaded member and is shown using the same reference numerals. A plurality (for example, 6) mounting members 127 are arranged around the axis L103 at equal intervals. The shaft portion of the mounting member 127 is inserted with the bolt insertion holes formed in the pressing member 128 and the second sound deadening material 108, respectively, and the head portion of the mounting member 127 is opposite to the second sound deadening material 108 of the pressing member 128. Lock to the side (right side of FIG. 3). The male screw formed on the shaft portion of the mounting member 127 is drilled in the engaging portion 138 and engraved, so that the male screw is removably screwed to the screw. As a result, the mounting member 127 sandwiches and fixes the laminated second sound deadening material 108 between the engaging portion 138 and the pressing member 128.

Each axis of the mounting member 127 is parallel to the axis L103 of the end 14a of the conduit 14. The axes of the end 14a of the conduit 14, the injection head 100, and the sound deadening means 102 are in a straight line. With the sound deadening means 102 attached to the injection head 100, the workability of connecting the base portion 137 of the injection head main body 101 to the end portion 14a of the conduit 14 with the first screw 112 is good.

The axis L103 of the end portion 14a of the conduit 14 is such that the axes of the injection head 100 including the injection head main body 101, the second sound deadening material 108, and the pressing member 128 are in a straight line. Therefore, the workability of the connection between the end portion 14a of the conduit 14 and the base portion 137 of the injection head main body 101 by the first screw 112 and the connection between the base portion 137 of the injection head main body 101 and the rectifying member 109 by the second screw 107 is improved. It is good. This good connection workability means that in many cases, the injection head 100 and the sound deadening means 102 have a higher ceiling than a person in a fire extinguishing target section of a building where the movement of people is not an obstacle. It is important in view of being connected to such places as.

At the time of extinguishing a fire, the high-pressure fire extinguishing gas injected through the nozzle hole 104 passes through the fine voids of the second sound deadening material 108 gradually, that is, smoothly, smoothly, and expands under reduced pressure to generate sound. Is reduced and suppressed, and is sprayed into the space in the fire extinguishing target section in the building. The fire extinguishing gas from the peripheral surface 124 of the first sound deadening material 108 is horizontally and radially ejected near the ceiling and can be uniformly and quickly diffused over the entire space in the fire extinguishing target section. Therefore, quick fire extinguishing of the fire extinguishing target section can be achieved.

The second sound deadening material 108 can attenuate the sound caused by the injection flow of the fire extinguishing gas from the injection head while reducing the size of the configuration, accurately adjust the injection and sound deadening characteristics, and reduce the flow rate of the fire extinguishing gas. A large sound reduction effect can be achieved without causing it.

In the above-described embodiment, the muffling means 102 having a complicated structure as compared with the injection head 100 can be attached to and detached from various injection heads 100 having different nozzle hole 104 diameters by the mounting member 127. The second sound deadening materials 113 and 108 can be commonly used for various injection heads 100. This sharing facilitates mass production of the first and second sound deadening materials 113 and 108, and improves productivity.

In addition, depending on whether or not there is a need for sound extinguishing in the fire extinguishing target area, individual selective use is possible, and in the fire extinguishing target area where there is no need for sound extinguishing, the gas fire extinguishing equipment can be removed. It can be simplified. Furthermore, the muffling means 102 removed from the fire extinguishing target section where the need for muffling is no longer required can be attached to another fire extinguishing target section to be muffled and reused, which is economical and energy-saving. Is planned.

In another embodiment of the present invention, the injection head 100 and the sound deadening means 102 may be configured integrally, that is, so as not to be removable. In this embodiment, the base portion 137 of the injection head main body 101 is provided at the end portion 14a of the conduit 14 so as to be removable and replaceable by the first screw 112, and various injection heads 100 having different nozzle hole 104 diameters are individually provided. You may choose to use it.

Further, the injection head 100 and the sound deadening means 102 are connected in advance by the second screw 107 and the mounting member 127 to form an assembly, and then the base portion 137 of the injection head main body 101 in this assembly is connected to the end of the conduit 14. The workability of connecting to the portion 14a with the first screw 112 is also good.

Further, in order to make the existing fire extinguishing target section in which the base portion 137 of the injection head main body 101 is connected to the end portion 14a of the conduit 14 by the first screw 112, the fire extinguishing target section to be muted, the injection head main body 101 is engaged. When the sound deadening means 102 is connected to the portion 138 by the second screw 107, the workability of the connection is also good.

There is a gap 115 between the end surface of the first sound deadening material 113 on the side facing the nozzle hole 104 and the end surface of the injection head main body 101 on the side facing the first sound deadening material 113. When the fire extinguishing gas is injected from the nozzle hole 104, fine foreign matter is stored and stored in the gap, so that clogging of the nozzle hole 104 due to the foreign matter can be prevented and noise due to clogging of the foreign matter can be prevented. It is possible to prevent a decrease in the flow rate at the time of generation and release.

Foreign matter is present in the conduit 14, for example, the scale and slag from welding in the conduit 14, when the conduit is a plated tube, the strips of the plated layer in the plated tube, rust, and the sealing material used in the fitting. Debris etc. Further, due to the decompression inside the injection head 100 and the release of the fire extinguishing gas outward in the radial direction, the injection reaction force acting from the injection head 100 to the conduit 14 in the rear direction (left side in FIG. It can be reduced to about 1/9 of the conventional technique shown in FIG.

In another embodiment of the present invention, the injection head 700 in which the end face disposed on the nozzle hole 104 side of the first sound deadening material 113 in the above-described embodiment, the injection head main body 101, and the mounting auxiliary member 103 are integrated. It was confirmed by the present inventor that the sound deadening effect does not decrease even if the space is separated from the end face arranged so as to face the first sound deadening material 113. The experiment and its results are described below with reference to FIGS. 5 and 6.

FIG. 5 is a cross-sectional view showing the injection head 700 and the sound deadening means 701 and 701a in which the experiment was conducted by the present inventor, and FIG. 6 is obtained when the present inventor releases a fire extinguishing gas according to the configuration of FIG. It is a figure which shows the time passage of the sound pressure level. In FIG. 5 (1), fire extinguishing gas is _{N 2} gas from conduit 714 is injected from the nozzle hole 704 of the injection head 700.

Four first sound deadening materials 705 are laminated and stored in the rectifying member 703 attached to the injection head 700. Further, three second sound deadening materials 706 are laminated and arranged on the downstream side (right side in FIG. 5) of the rectifying member 703 in the discharge direction of the fire extinguishing gas. The fire extinguishing gas that has passed through the first sound deadening material 705 passes through the rectifying hole 707 of the rectifying member 703, is rectified, flows into the second sound deadening material 708, and is radially outward from the peripheral surface 709 of the second sound deadening material 708. At the same time, it is discharged from the discharge hole 752 of the holding member 728 into the space in the fire extinguishing target section. The first sound deadening material 705 comes into close contact with the flat end surface of the outlet end of the nozzle hole 704 of the injection head 500.

The supply pressure of the fire extinguishing gas supplied from the conduit 714 to the injection head 700 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the fire extinguishing gas is about 55 m ³ / min, and the flow velocity of the fire extinguishing gas discharged from the nozzle hole 504. Is about 60 to 100 m / sec. The porosity of the voids of the sound deadening material 508 used in this experiment is about 97%, the diameter is about 130 mm, the thickness of the first sound deadening material 706 is 5 mm / sheet, and the thickness of the second sound deadening material 708 is 10 mm / sheet. It is a sheet.

In FIG. 5 (2), the first sound deadening material 705 of the sound deadening means 701a is arranged with a gap 753 of about 1 mm from the flat end surface of the outlet end of the nozzle hole 704 of the injection head 700, and the other configurations are shown in FIG. It is the same as 5 (1).

FIG. 6 is a diagram showing the passage of time of the sound pressure level obtained when the present inventor releases the fire extinguishing gas according to the configuration of FIG. Line 754 is an experimental result in which the first sound deadening material 705 is brought into close contact with the flat end surface of the outlet end of the nozzle hole 704 as shown in FIG. 5 (1), and line 755 is the result of an experiment in FIG. 5 (2). ) Is the result of the experiment in which the first sound deadening material 705 is arranged with a gap 753 from the flat end surface of the outlet end of the nozzle hole 704.

From these experimental results, according to the configuration in which the first sound deadening material 705 is in close contact with the flat end surface of the outlet end of the nozzle hole 704 (FIG. 5 (1)), the first sound deadening material 705 is arranged with a gap of 753. It was confirmed that there was almost no difference in the muffling effect as compared with FIG. 5 (2)). Therefore, it was confirmed that the muffling effect does not decrease even if a gap 753 is provided between the end face of the first muffling material 705 facing the nozzle hole 704 and the end face of the injection head 700 facing the first muffling material 705. It was.

By providing such a gap 753 between the end face of the first sound deadening material 705 facing the nozzle hole 704 and the end face of the injection head 700 facing the first sound deadening material 705, the sound deadening effect is not deteriorated. When fine foreign matter is stored and stored in the gap 753 and the fire extinguishing gas is injected from the nozzle hole 704, the foreign matter prevents clogging of the first and second sound deadening materials 705 and 706, and the foreign matter's eyes. It is possible to prevent the generation of noise due to clogging. Foreign matter is present in the conduit 14, for example, scales and slags from welding in the conduit 14, and when the conduit 14 is a plated tube, stripped pieces of the plated layer in the plated tube, rust, and sealing material used in fittings. Such as fragments of.

FIG. 7 is a cross-sectional view showing the injection head 500 and the sound deadening means 502 and 502a in which the experiment was conducted by the present inventor. 7 (1), fire extinguishing gas is _{N 2} gas from conduit 514 is injected from the nozzle hole 504 of the injection head 500.

Eleven sound deadening materials 508 are laminated and stored in the linear cylindrical housing 551 of the sound deadening means 502 attached to the injection head 500. The fire extinguishing gas that has passed through the sound deadening material 508 is discharged from the discharge hole 552 of the housing 551 into the space in the fire extinguishing target section. The sound deadening material 508 comes into close contact with the flat end surface of the outlet end of the nozzle hole 504 of the injection head 500.

The supply pressure of the fire extinguishing gas supplied from the conduit 514 to the injection head 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the fire extinguishing gas is about 55 m ³ / min, and the flow velocity of the fire extinguishing gas discharged from the nozzle hole 504. Is about 60 to 100 m / sec. The porosity of the voids of the sound deadening material 508 used in this experiment is about 97%, the diameter is about 130 mm, and the thickness is 10 mm / sheet.

In FIG. 7 (2), the sound deadening material 508 of the sound deadening means 502a is arranged with a gap 553 of about 1 mm from the flat end surface of the outlet end of the nozzle hole 504 of the injection head 500, and the other configurations are shown in FIG. 7 (2). It is the same as 1).

FIG. 8 is a diagram showing the passage of time of the sound pressure level obtained when the present inventor releases the fire extinguishing gas according to the configuration of FIG. 7. Line 554 is an experimental result with a configuration in which the sound deadening material 508 is brought into close contact with the flat end surface of the outlet end of the nozzle hole 504 as shown in FIG. 7 (1), and line 555 is the result of an experiment in which the sound deadening material 508 is in close contact with the flat end surface. As described above, it is an experimental result with a configuration in which the sound deadening material 508 is arranged with a gap 553 from the flat end surface of the outlet end of the nozzle hole 504.

From these experimental results, according to the configuration in which the sound deadening material 508 is in close contact with the flat end surface of the outlet end of the nozzle hole 504 (FIG. 7 (1)), the sound deadening material 508 is arranged with a gap of 553 (FIG. 7). It was confirmed that a large muffling effect of about 16 dB was obtained as compared with (2)). Therefore, it is confirmed that the muffling effect is improved according to the embodiment in which the end face of the muffling material 508 facing the nozzle hole 504 and the end face of the injection head 500 facing the muffling material 508 are in close contact with each other. Was done.

FIG. 9 is a cross-sectional view showing a gas fire extinguishing device according to another embodiment of the present invention. In the sound extinguishing means 600 of this gas fire extinguishing device, the above-mentioned guide member 121 is omitted. The function of the guide member 121 will be described with reference to FIG.

The fire extinguishing gas from each of the plurality of nozzle holes 609 formed uniformly distributed over the entire surface of the flat plate-shaped nozzle portion 608 of the injection head main body 601 is injected along the axes parallel to each other of each nozzle hole 609. It gradually passes through the fine voids of the first sound deadening material 613 and the second sound deadening material 610 arranged downstream of the nozzle hole 609, that is, smoothly and smoothly, and expands under reduced pressure. The axes of the injection head main body 601 and the first and second sound deadening materials 613 and 610 are in a straight line. The fine voids of the first and second sound deadening materials 613 and 610 give pressure loss to the fire extinguishing gas passing through them.

In the second sound deadening material 610, after being injected along the axis of each nozzle hole 609, the fire extinguishing gas injected into the second sound deadening material 610 through the second sound deadening material 613 and the rectifying hole 612 of the rectifying member 611. Assuming that the path followed by is a straight line for simplification, the path length from each rectifying hole 612 to the most downstream end face of the second sound deadening material 610 whose overall shape is substantially a straight column is shown in the figure. In 9, it is indicated by the reference numeral L601.

The path length from the side portion of the rectifying member 611 to the peripheral surface 614 of the second sound deadening material 610 is indicated by reference numeral L602 in FIG. When the outer diameter of the rectifying member 611 is configured to be relatively larger than the axial length of the second sound deadening material 610 in order to increase the flow rate of the fire extinguishing gas injected from the rectifying hole 612, L601> L602.

The pressure loss acting on the fire extinguishing gas is proportional to these path lengths L601 and L602, and therefore the distribution of the pressure loss in the second sound deadening material 610 is as shown by the isobars 603 in which the positions where the equal pressure loss occurs are connected. .. The pressure loss is the largest in the region on the axis of the second sound deadening material 610, and becomes smaller as it becomes a peripheral region away from the axis. Since the fire extinguishing gas injected from the rectifying hole 612 easily flows through the region where the pressure loss is small, the fire extinguishing gas in the second sound deadening material 610 is indicated by the reference mark 604 of the virtual line in the axial direction of the injection head main body 601. Proceed as indicated and laterally as indicated by reference numeral 605, and further backwards as indicated by reference numeral 606. The lengths of the reference numerals 604, 605, and 606 are shown corresponding to the flow rate of the fire extinguishing gas, and a relatively large flow rate of the fire extinguishing gas flows in the lateral and back directions. In order to quickly fill the fire extinguishing target section with the fire extinguishing gas, the second sound deadening material installed near the wall surface (left side in FIG. 9) among the plurality of second sound deadening materials 610 is along the axial direction of the injection head main body 601. In the direction indicated by the reference mark 604 of the virtual line and in the direction indicated by the reference mark 605 to the side, the fire extinguishing gas is injected at the highest possible flow rate and proceeds in the direction behind as indicated by the reference mark 606. The flow rate must be suppressed.

In each of the above-described embodiments related to the above-mentioned FIGS. 1 to 8 of the present invention, the guide member 121 is directed to the direction behind FIG. 9 among the fire extinguishing gases injected from the sound deadening materials 113, 108; 705 and 708. The fire extinguishing gas that advances to 606 is blocked and advances in the axial direction 604 and the side 605 of the injection head main body 101 and the injection head 700. As a result, even in a large-scale fire extinguishing target section where the fire extinguishing gas reach is 15 m or more, the fire extinguishing gas is sufficiently diffused and the space in the fire extinguishing target section is uniformly adjusted to a predetermined fire extinguishing agent concentration in a short time. You will be able to reach it and extinguish the fire.

The gas fire extinguishing device of the present invention releases fire extinguishing gas as a fire extinguishing agent into the space in the fire extinguishing target section of the building when a fire occurs, so that the fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target section to extinguish the fire. It can be carried out extensively.

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas toward a space in a fire extinguishing target section in a building. The fire extinguishing gas injection device discharges fire extinguishing gas from an injection head 100 and the injection head 100. The muffling means 102 has a muffling means 102 for attenuating the sound generated by the gas, and the muffling means 102 has a second muffling material 108 as a first muffling member provided on the injection head 100 side and a downstream side of the first muffling member. It has a second sound deadening material 108 as a second sound deadening member provided in the above, and each of the first and second sound deadening members is formed in a flat plate shape, and is made of a porous material through which gas can flow. Become. The first and second sound deadening members are laminated to form a cylindrical shape. The first and second sound deadening members have the same outer diameter. The first and second sound deadening members have the same thickness. The entire outer peripheral surface of the first and second sound deadening members is exposed to the atmosphere. A pressing member 128 as a ring member for fixing the second sound deadening member is further provided. The muffling means has a first muffling material 113 as a first muffling means located on the upstream side and a second muffling material 108 as a second muffling means located on the downstream side. A rectifying member as an intermediate member through which gas can flow is arranged between the second sound deadening means.

Since the sound deadening member is formed in a flat plate shape, the sound deadening member is easily bent. As a result, damage to the sound deadening member can be prevented.

FIG. 10 is a perspective view showing a part of the configuration including the injection head 200 and the sound extinguishing means 202 of the gas fire extinguishing device according to the embodiment of the present invention. The gas fire extinguishing device of the present embodiment is provided in the fire extinguishing target section of the building, and the injection head 200 for injecting high-pressure fire extinguishing gas toward the space in the fire extinguishing target section is connected to the injection head 200. Injection from a conduit 14 that guides a high-pressure fire extinguishing gas to the 200, a fire extinguishing gas supply source 15 that supplies the high-pressure fire extinguishing gas to the conduit 14, and a nozzle hole 204 (see FIG. 12 described later) formed in the injection head 200. Includes a muffling means 202 that attenuates the sound generated by the injection of the fire extinguishing gas.

The fire extinguishing gas is realized by a non-combustible gas such as _{N 2} gas, CO _{2 gas and halide gas.} Such fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target section having a fire extinguishing gas reach of 15 m or more, and the space in the fire extinguishing target section is uniformly reached to a predetermined fire extinguishing agent concentration in a short time. You can let it extinguish the fire.

The injection head 200 and the muffling means 202 constitute the fire extinguishing gas injection unit 211. In such a fire extinguishing gas injection unit 211, the fire extinguishing gas is supplied from the fire extinguishing gas supply source 15 to the injection head 200 via the conduit 14. The conduit 14 includes a main pipe 23 connected to the fire 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 extinguishes a fire through such a pipe 14. High-pressure fire extinguishing gas from the gas supply source 15 is guided to the injection head 200. The conduit 14 is fastened to the base 20 and the 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.

FIG. 11 is a perspective view showing the injection head 200 and the muffling means 202, and FIG. 12 is a cross-sectional view showing the injection head 200 and the muffling means 202. The injection head 200 having a sound extinguishing function is installed on the wall in order to release the fire extinguishing gas to the fire extinguishing target section in the gas-based fire extinguishing equipment using the fire extinguishing gas, and the sound extinguishing means 202 is attached to the injection head body 201 as an attachment member such as a bolt. It is configured to be detachably attached by 227. A nozzle hole 204, which is a choke, is directly formed in the injection head main body 201. The nozzle hole 204 limits the flow rate of the fire extinguishing gas to a desired value.

The injection head main body 201 has a base 205 and an outward flange 206 connected to the base 205. The base 205 is detachably attached to the injection head body 201 by screws 207.

The sound deadening means 202 is composed of a sound deadening material 208 made of a porous material through which gas can flow. The sound deadening material 208 has a plurality of members each having a thin disk shape and a thin annular shape, and these members are laminated. The overall shape of the laminated sound deadening material 208 is substantially columnar.

FIG. 13 is a partially enlarged cross-sectional view showing a state in which the guide member 221 is sandwiched between the injection head main body 201 and the sound deadening material 208. The end surface 220 of one side (left side of FIGS. 12 and 13) of the sound deadening material 208 is arranged in contact with the annular mounting portion 222 of the guide member 221 and facing the outward flange 206 of the injection head main body 201. .. The guide member 221 has a mounting portion 222 and a short tubular guide portion 223 that is connected to the mounting portion 222 and guides the fire extinguishing gas.

The peripheral surface 224 of the sound deadening material 208 and the end surface 225 on the other side (right side in FIG. 12) are portions in contact with the pressing member 228 that fixes the sound deadening material 208 to the outward flange 206 of the injection head body 201 via the mounting member 227. Except for, it is open to the atmosphere. The shaft portion of the mounting member 227 is screwed to the outward flange 206 of the injection head main body 201 through the pressing member 228, the sound deadening material 208, and the mounting portion 222 of the guide member 221.

As shown in FIG. 13, the mounting portion 222 of the guide member 221 fits into the mounting seat 231 formed by being annularly recessed in the outward flange 206 of the injection head main body 201, and is radially inward from the mounting seat 231. It rises from the end face 232 (lower part of FIG. 13) by the gap ΔL1.

With reference to FIG. 12 again, in the injection head 200, the injection head main body 201 has a base 205 and an outward flange 206 connected to the base 205. The base 205 of the injection head 200 is detachably connected to the end 14a of the conduit 14 by a first screw 212 which is a taper screw.

The injection head main body 201 is provided on the base 205 of the injection head main body 201 so as to be removable and replaceable. Various injection head main bodies 201 having different diameters of the nozzle holes 204 are individually selected and used depending on the length of the conduit 14 and the like. The reason will be described. The gas fire extinguishing device should quickly fill the space in the fire extinguishing area with fire extinguishing gas while ensuring a large flow rate (for example, 20,000 to 100,000 liters / minute) required for fire extinguishing, which is its original role. It must be configured to ensure a high flow velocity (eg 100 m / s) to release the extinguishing gas. Therefore, the Fire Fighting Law Enforcement Regulations stipulate that the radiation pressure of the fire extinguishing gas from the nozzle hole 204 of the injection head 200 in the gas fire extinguishing device is 1.9 MPa or more, and in practice, it is 2 to 3 MPa (≈20 to 30 kgf /). cm ^2, Note, carried out at high radiation pressures further to as high 6MPa ≒ 60kgf / cm ^2).

Therefore, the value of the diameter of the nozzle hole 204 of the injection head 200 is such that the fire extinguishing gas injected from the nozzle hole 204 achieves the above-mentioned large flow rate, high flow velocity, and high radiation pressure from the fire extinguishing gas supply source 15. It must be set depending on the length of the conduit 14 to the installation site of 200 and therefore the conduit resistance.

Therefore, the diameter of the nozzle hole 204 differs depending on the length of the conduit 14, and therefore, various injection heads 200 having different diameters of the nozzle hole 204 are individually selected and used for each installation location of the injection head 200. Must. As described above, in the gas fire extinguishing device, various injection heads 200 having different diameters of the nozzle holes 204 are indispensable.

The sound deadening means 202 has a sound deadening material 208, a pressing member 228, and a mounting member 227. The sound deadening material 208 is made of a porous material through which gas can flow, and is made of a porous metal obtained by sintering fine metal powder or fine metal strips, for example, and smoothly and slowly extinguishes a high-pressure fire gas. The sound deadening effect can be effectively realized without lowering the flow rate by the reduced pressure expansion. As such a sound deadening material 208, a porous material having different density of voids can be appropriately selected and used according to the flow conditions of the fire extinguishing gas such as the diameter, length, number and formation position of the nozzle holes 204. Further, the sound deadening material 208 may be formed by laminating, for example, a plurality of layers of wire mesh, or may be a plate-shaped molded product or a porous member made of synthetic resin fibers.

The sound deadening material 208 is formed in the shape of a flat plate such as a disk, and a plurality of the sound deadening material 208 is laminated. Each of the overall shapes of the laminated sound deadening material 208 is, for example, cylindrical. The end surface 220 of the laminated sound deadening material 208 on one side in the axial direction (left side in FIG. 12) faces the injection head main body 201, for example, is in contact with the laminated sound deadening material 208, and the peripheral surface 224 of the laminated sound deadening material 208 is arranged. , Open to the atmosphere.

The pressing member 228 presses the end surface 225 on the other side (right side in FIG. 12) of the laminated sound deadening material 208. The presser member 228 has a flat plate shape and is made of a ring-shaped metal extending along the peripheral edge of the sound deadening material 208.

The mounting member 227 is, in this embodiment, a bolt as a threaded member and is shown using the same reference numerals. A plurality (for example, 3) of the mounting members 227 are arranged axially symmetrically around the axis L203 at equal intervals. The shaft portion of the mounting member 227 is inserted with bolt insertion holes formed in the pressing member 228 and the sound deadening material 208, respectively, and the head portion of the mounting member 227 is on the opposite side of the pressing member 228 from the sound deadening material 208 (FIG. 12). Lock to the right side of). The male screw formed on the shaft portion of the mounting member 227 is drilled in the outward flange 206 of the injection head main body 201 and is engraved, so that the male screw is removably screwed to the screw. As a result, the mounting member 227 sandwiches and fixes the laminated sound deadening material 208 between the outward flange 206 and the pressing member 228.

Each axis of the mounting member 227 is parallel to the axis L103 of the end 14a of the conduit 14. The axes of the end portion 14a of the conduit 14, the injection head 200, and the sound deadening means 202 are in a straight line. With the sound deadening means 202 attached to the injection head 200, the workability of connecting the base portion 205 of the injection head main body 201 to the end portion 14a of the conduit 14 with the first screw 212 is good.

The axis L103 of the end portion 14a of the conduit 14 is such that the axes of the injection head 200 including the injection head main body 201, the sound deadening material 208, and the pressing member 228 are in a straight line. Therefore, the workability of the connection between the end portion 14a of the conduit 14 and the base portion 205 of the injection head main body 201 by the first screw 212 and the connection between the injection head main body 201 and the nozzle member 234 by the second screw 207 is good. .. This good connection workability means that in many cases, the injection head 200 and the sound deadening means 202 have a higher ceiling than a person in a fire extinguishing area in a building where the movement of people is not an obstacle. It is important in view of being connected to such places as.

At the time of extinguishing a fire, the high-pressure fire extinguishing gas injected through the nozzle hole 204 passes through the fine voids of the sound deadening material 208 gradually, that is, smoothly and smoothly, and expands under reduced pressure to reduce the generation of sound. It is suppressed and sprayed into the space inside the fire extinguishing area in the building. The fire extinguishing gas from the peripheral surface 224 of the sound deadening material 208 is jetted horizontally and radially near the ceiling and can be uniformly and quickly diffused over the entire space in the fire extinguishing target section. Therefore, quick fire extinguishing of the fire extinguishing target section can be achieved.

With this sound deadening material 208, it is possible to attenuate the sound caused by the injection flow of the fire extinguishing gas from the injection head while reducing the size of the configuration, and accurately adjust the injection and sound deadening characteristics without reducing the flow rate of the fire extinguishing gas. A large acoustic reduction effect can be achieved.

In the above-described embodiment, the sound deadening means 202 having a more complicated structure than the injection head 200 can be attached to and detached from various injection heads 200 having different nozzle hole 204 diameters by the mounting member 227. Therefore, the sound deadening material 208 Can be commonly used for various injection heads 200. This sharing facilitates mass production of the sound deadening material 208 and improves productivity.

In addition, depending on whether or not there is a need for sound extinguishing in the fire extinguishing target area, individual selective use is possible, and in the fire extinguishing target area where there is no need for sound extinguishing, the gas fire extinguishing equipment can be removed. It can be simplified. Furthermore, the muffling means 202 removed from the fire extinguishing target section where the need for muffling is no longer required can be attached to another fire extinguishing target section to be muffled and reused, which is economical and energy-saving. Is planned.

In another embodiment of the present invention, the injection head 200 and the sound deadening means 202 may be configured integrally, that is, so as not to be removable. In this embodiment, the base 205 of the injection head body 201 is provided at the end 14a of the conduit 14 so as to be removable and replaceable by the first screw 212, and various injection heads 200 having different nozzle hole 204 diameters are individually provided. You may choose to use it.

Further, the injection head 200 and the nozzle member 234 are connected in advance by a second screw 207 to form an assembly, and then the base 205 of the injection head body 201 in this assembly is attached to the end 14a of the conduit 14. The workability of connecting with the first screw 212 is also good.

Further, in order to make the existing fire extinguishing target section in which the base 205 of the injection head main body 201 is connected to the end portion 14a of the conduit 14 by the first screw 212, the fire extinguishing target section to be extinguished, the injection head main body 201 When the sound deadening means 202 is connected by the mounting member 227, the workability of the connection is also good.

There is a gap 215 having an interval ΔL2 in the direction of the axis L203 between the end surface of the sound deadening material 208 on the side facing the nozzle hole 204 and the end surface of the injection head main body 201 on the side facing the sound deadening material 208. When the fire extinguishing gas is injected from the nozzle hole 204, fine foreign matter is stored and stored in the gap, so that clogging of the nozzle hole 204 due to the foreign matter can be prevented and noise due to clogging of the foreign matter can be prevented. It is possible to prevent a decrease in the flow rate at the time of generation and release.

Foreign matter is present in the conduit 14, for example, the scale and slag from welding in the conduit 14, when the conduit is a plated tube, the strips of the plated layer in the plated tube, rust, and the sealing material used in the fitting. Debris etc. Further, due to the decompression inside the injection head 100 and the release of the fire extinguishing gas outward in the radial direction, the injection reaction force acting from the injection head 100 to the conduit 14 in the rear direction (left side in FIG. 12) at the time of the fire extinguishing gas injection is applied. It can be reduced to about 1/9 of the conventional technique shown in FIG. 28.

In another embodiment of the present invention, an end face disposed on the nozzle hole 204 side of the sound deadening material 208 in the above-described embodiment and an end surface disposed on the injection head main body 201 facing the sound deadening material 208. It was confirmed by the present inventor that the muffling effect does not decrease even if the space is separated. The experiment and its results are described below with reference to FIGS. 14 and 15.

FIG. 14 is a cross-sectional view showing an injection head 500 and sound deadening means 502 and 502a for which an experiment was conducted by the present inventor. In FIG. 14 (1), fire extinguishing gas is _{N 2} gas from conduit 514 is injected from the nozzle hole 504 of the injection head 500.

Eleven sound deadening materials 508 are laminated and stored in the linear cylindrical housing 551 of the sound deadening means 502 attached to the injection head 500. The fire extinguishing gas that has passed through the sound deadening material 508 is discharged from the discharge hole 552 of the housing 551 into the space in the fire extinguishing target section. The sound deadening material 508 comes into close contact with the flat end surface of the outlet end of the nozzle hole 504 of the injection head 500.

The supply pressure of the fire extinguishing gas supplied from the conduit 514 to the injection head 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the fire extinguishing gas is about 55 m ³ / min, and the flow velocity of the fire extinguishing gas discharged from the nozzle hole 504. Is about 60 to 100 m / sec. The porosity of the voids of the sound deadening material 508 used in this experiment is about 97%, the diameter is about 130 mm, and the thickness is 10 mm / sheet.

In FIG. 14 (2), the sound deadening material 508 of the sound deadening means 502a is arranged with a gap 553 of about 1 mm from the flat end surface of the outlet end of the nozzle hole 504 of the injection head 500, and the other configurations are shown in FIG. 14 (2). It is the same as 1).

FIG. 15 is a diagram showing the passage of time of the sound pressure level obtained when the present inventor releases the fire extinguishing gas according to the configuration of FIG. Line 554 is an experimental result with a configuration in which the sound deadening material 508 is brought into close contact with the flat end surface of the outlet end of the nozzle hole 504 as shown in FIG. 14 (1), and line 555 is the result of an experiment in which the sound deadening material 508 is in close contact with the flat end surface. As described above, it is an experimental result with a configuration in which the sound deadening material 508 is arranged with a gap 553 from the flat end surface of the outlet end of the nozzle hole 504.

From these experimental results, according to the configuration (FIG. 14 (1)) in which the sound deadening material 508 is in close contact with the flat end surface of the outlet end of the nozzle hole 504, the sound deadening material 508 is arranged with a gap of 553 (FIG. 14). It was confirmed that a large muffling effect of about 16 dB was obtained as compared with (2)). Therefore, it is confirmed that the muffling effect is improved according to the embodiment in which the end face of the muffling material 508 facing the nozzle hole 504 and the end face of the injection head 500 facing the muffling material 508 are in close contact with each other. Was done.

Therefore, as in the embodiment of FIGS. 10 to 13, a gap 215 is provided between the end surface of the sound deadening material 208 on the side facing the nozzle hole 204 and the end surface of the injection head main body 201 on the side facing the sound deadening material 208. At this time, by setting the interval ΔL2 in the direction of the axis L203 to a range in which the muffling effect does not decrease, for example, 0.1 mm to 1.5 mm, the muffling material 208 is clogged with foreign matter without substantially reducing the muffling effect. Can be prevented.

FIG. 16 is a cross-sectional view showing a gas fire extinguishing device according to another embodiment of the present invention. In the sound extinguishing means 600 of this gas fire extinguishing device, the above-mentioned guide member 221 is omitted. The function of the guide member 221 will be described with reference to FIG.

The fire extinguishing gas from each of the plurality of nozzle holes 609 formed uniformly distributed over the entire surface of the nozzle portion 608 corresponding to the flat plate-shaped end wall 241 of the injection head main body 601 is parallel to each other of the nozzle holes 609. It is injected along a parallel axis and gradually passes through the fine voids of the sound deadening material 613 arranged downstream of the nozzle hole 609, that is, smoothly and smoothly, and expands under reduced pressure. Each axis of the injection head main body 601 and the sound deadening material 613 is in a straight line. The fine voids in the sound deadening material 613 give pressure loss to the fire extinguishing gas passing through them.

Assuming that the path followed by the fire extinguishing gas injected from the nozzle hole 609 into the sound deadening material 613 is a straight line for simplification, from the nozzle portion 608 to the sound deadening material 613 whose overall shape is substantially a straight cylinder. The path length to the most downstream end face is indicated by reference numeral L601 in FIG.

The path length from the side portion of the nozzle portion 608 to the peripheral surface of the sound deadening material 613 is indicated by reference numeral L602 in FIG. In order to increase the flow rate of the fire extinguishing gas injected from the nozzle portion 608, when the outer diameter of the nozzle portion 608 is configured to be relatively large with respect to the axial length of the sound deadening material 613, L601> L602.

The pressure loss acting on the fire extinguishing gas is proportional to these path lengths L601 and L602, and therefore the distribution of the pressure loss in the sound deadening material 613 is as shown by the isobars 603 in which the positions where the equal pressure loss occurs are connected. The pressure loss is the largest in the region on the axis of the sound deadening material 613, and becomes smaller in the peripheral region away from the axis. Since the fire extinguishing gas injected from the nozzle portion 608 tends to flow through the region where the pressure loss is small, the fire extinguishing gas in the sound deadening material 613 is indicated by the reference mark 604 of the virtual line in the axial direction of the injection head main body 601. As indicated by the reference mark 605, it also proceeds laterally as indicated by the reference mark 605, and further proceeds in the backward direction as indicated by the reference mark 606. The lengths of the reference numerals 604, 605, and 606 are shown corresponding to the flow rate of the fire extinguishing gas, and a relatively large flow rate of the fire extinguishing gas flows in the lateral and back directions. In order to quickly fill the fire extinguishing target section with the fire extinguishing gas, a virtual line from the sound deadening material installed near the wall surface (left side in FIG. 16) among the plurality of sound deadening materials 613 is provided along the axial direction of the injection head main body 601. Inject as much flow as possible in the direction indicated by reference numeral 604 and laterally in the direction indicated by reference numeral 605, and suppress the flow rate of the extinguishing gas traveling in the direction behind as indicated by reference numeral 606. There must be.

In each of the above-described embodiments related to the above-mentioned FIGS. 10 to 16 of the present invention, the guide member 221 is a fire extinguishing gas that travels in the direction 606 behind FIG. 16 among the fire extinguishing gases injected from the sound deadening material 613. Is prevented, and the injection head body 601 is advanced in the axial direction 604 and the side 605. As a result, even in a large-scale fire extinguishing target section where the fire extinguishing gas reach is 15 m or more, the fire extinguishing gas is sufficiently diffused and the space in the fire extinguishing target section is uniformly adjusted to a predetermined fire extinguishing agent concentration in a short time. You will be able to reach it and extinguish the fire.

The gas fire extinguishing device of the present invention releases fire extinguishing gas as a fire extinguishing agent into the space in the fire extinguishing target section of the building when a fire occurs, so that the fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target section to extinguish the fire. It can be carried out extensively.

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas toward a space in a fire extinguishing target section in a building. The fire extinguishing gas injection device discharges fire extinguishing gas from an injection head 100 and the injection head 100. It has a muffling means 202 for attenuating the sound generated by the gas, and the muffling means 202 is provided with a muffling material 208 as a first muffling member provided on the injection head 100 side and a downstream side of the first muffling member. It has a sound deadening material 208 as a second sound deadening member, and each of the first and second sound deadening members is formed in a flat plate shape and is made of a porous material through which gas can flow. The first and second sound deadening members are laminated to form a cylindrical shape. The first and second sound deadening members have the same outer diameter. The first and second sound deadening members have the same thickness. The entire outer peripheral surface of the first and second sound deadening members is exposed to the atmosphere. A pressing member 228 as an annular member for fixing the second sound deadening member is further provided.

FIG. 17 is a perspective view showing a part of the configuration including the injection head 300 and the sound extinguishing means 302 of the gas fire extinguishing device according to the embodiment of the present invention. The gas fire extinguishing device of the present embodiment is provided in the fire extinguishing target section of the building, and the injection head 300 for injecting high-pressure fire extinguishing gas toward the space in the fire extinguishing target section is connected to the injection head 300. From the conduit 314 that guides the high pressure extinguishing gas to the 300, the fire extinguishing gas supply source 315 that supplies the high pressure extinguishing agent gas to the conduit 314, and the nozzle hole 304 (see FIG. 19 described later) formed in the injection head 300. It includes a muffling means 302 that attenuates the sound generated by the injection of the injected fire extinguishing gas.

The fire extinguishing gas is _{realized by an inert gas such as N 2} gas and CO ₂ gas or an active gas such as a halide gas. Such fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target section having a fire extinguishing gas reach of 15 m or more, and the space in the fire extinguishing target section is uniformly reached to a predetermined fire extinguishing agent concentration in a short time. You can let it extinguish the fire.

The injection head 300 and the muffling means 302 form a fire extinguishing gas injection unit 311. In such a fire extinguishing gas injection unit 311 the fire extinguishing gas is supplied from the fire extinguishing gas supply source 315 to the injection head 300 via the conduit 314. The conduit 314 includes a main pipe 323 connected to the fire extinguishing gas supply source 315, a branch pipe 318 interposed in the main pipe 323, and a branch pipe 319 connected to the branch pipe 318, and extinguishes the fire through such a conduit 314. High-pressure fire extinguishing gas from the gas supply source 315 is guided to the injection head 300. The conduit 314 is fastened to the base 316 and the bracket 321 by a fastener 322 such as a U bolt, and is installed on the building frame in a state where vibration and displacement are suppressed.

FIG. 18 is a perspective view showing the injection head 300 and the sound deadening means 302, and FIG. 19 is a cross-sectional view showing the injection head 300 and the sound deadening means 302. The injection head 300 is installed on the ceiling in order to release the fire extinguishing gas into the space in the fire extinguishing target section in the gas-based fire extinguishing device using the fire extinguishing gas. The injection head 300 has an injection head main body 301 and a nozzle member 339. A sound deadening means 302 is attached to the injection head main body 301.

In the injection head 300, the injection head main body 301 has a base portion 337 and an outward flange 338 connected to the base portion 337. The base portion 337 of the injection head 300 is detachably connected to the end portion 303 of the conduit 314 by the first screw 312 which is a taper screw.

The nozzle member 339 has a tubular portion 340 and an end wall 341. The tubular portion 340 extends along the vertical axis L303 above and below the end 303 of the conduit 314. The tubular portion 340 is connected to the peripheral wall 342 in which a plurality of nozzle holes 304 are formed and one end in the axial direction (upper part of FIG. 19) of the peripheral wall 342, and can be attached to and detached from the base portion 337 of the injection head main body 301 by a second screw. Has a base end portion 306 connected to. The end wall 341 closes the other end of the peripheral wall 342 in the axial direction (lower part of FIG. 19). The nozzle hole 304 limits the flow rate of the fire extinguishing gas to a desired value.

The base end portion 306 of the nozzle member 339 is provided on the base portion 337 of the injection head main body 301 so as to be removable and replaceable. Various nozzle members 339 having different diameters of the nozzle holes 304 are individually selected and used depending on the length of the conduit 314 and the like. The reason will be described. The gas fire extinguishing device should quickly fill the space in the fire extinguishing area with fire extinguishing gas while ensuring a large flow rate (for example, 20,000 to 100,000 liters / minute) required for fire extinguishing, which is its original role. It must be configured to ensure a high flow velocity (eg 100 m / s) to release the extinguishing gas. Therefore, the Fire Fighting Law Enforcement Regulations stipulate that the radiation pressure of the fire extinguishing agent gas from the nozzle hole 304 of the injection head 300 in the gas fire extinguishing device is 1.9 MPa or more, and in practice, it is 2 to 3 MPa (≈20 to 30 kgf). It is carried out at a high radiation pressure of / cm ² , which is even higher (up to about 6 MPa ≈ 60 kgf / cm ^2).

Therefore, the value of the diameter of the nozzle hole 304 of the injection head 300 is such that the fire extinguishing agent gas injected from the nozzle hole 304 is injected from the fire extinguishing gas supply source 315 so as to achieve the above-mentioned large flow rate, high flow velocity, and high radiation pressure. It must be set depending on the length of the conduit 314 to the location of the head 300 and therefore the line resistance. Therefore, the diameter of the nozzle hole 304 differs depending on the length of the conduit 314 and the like. Therefore, various injection heads 300 having different diameters of the nozzle hole 304 are individually selected and used for each installation location of the injection head 300. Must. As described above, in the gas fire extinguishing device, various injection heads 300 having different diameters of the nozzle holes 304 are indispensable.

The sound deadening means 302 has a sound deadening material 308, a pressing member 328, and a mounting member 327. The sound deadening material 308 is made of a porous material through which gas can flow, for example, made of a porous metal obtained by sintering fine metal powder or fine metal strips, or for example, a plurality of layers of wire mesh are laminated. It may be configured or may be made of synthetic resin. As such a sound deadening material 308, a porous material having different density of voids can be appropriately selected and used according to the flow conditions of the fire extinguishing gas such as the diameter, length, number, and formation position of the nozzle holes 304.

The sound deadening material 308 is formed in the shape of a flat plate such as a disk, and a plurality of sheets are laminated. The overall shape of the laminated sound deadening material 308 is, for example, a columnar shape. The end face 320 on one side (upper side of FIG. 19) of the laminated sound deadening material 308 in the axial direction faces the lower surface of FIG. 19 in the outward flange 338 of the injection head main body 301, and is arranged and laminated, for example, in contact with the lower surface. The peripheral surface 324 of the sound deadening material 308 is open to the atmosphere. The sound deadening material 308 is formed with an insertion hole 310 through which the tubular portion 340 of the nozzle member 339 is inserted.

The pressing member 328 presses the end surface 325 on the other side (lower side of FIG. 19) of the laminated sound deadening material 308. The pressing member 328 has a flat plate shape and has a peripheral surface extending along the peripheral surface 324 of the sound deadening material 308.

The mounting member 327 is a bolt as a threaded member in this embodiment and is shown using the same reference numerals. A plurality (for example, 6) bolts 327 are arranged at equal intervals around the axis L303. The shaft portion of the bolt 327 inserts the bolt insertion holes formed in the presser member 328 and the sound deadening material 308, respectively, and the head of the bolt 327 is on the opposite side of the presser member 328 from the sound deadening material 308 (lower part of FIG. 19). ). The male screw formed on the shaft portion of the bolt 327 is drilled in the outward flange 338 and engraved, so that the male screw is removably screwed to the screw. As a result, the bolt 327 holds and fixes the laminated sound deadening material 308 between the outward flange 338 and the pressing member 328.

Each axis of the bolt 327 is parallel to the axis L303 of the end 303 of the conduit 314. The axes of the end 303 of the conduit 314, the injection head 300, and the sound deadening means 302 are in a straight line. With the sound deadening means 302 attached to the injection head 300, the workability of connecting the base portion 337 of the injection head main body 301 to the end portion 303 of the conduit 314 with the first screw 312 is good.

The axis L303 of the end portion 303 of the conduit 314 is such that each axis of the injection head 300 including the injection head main body 301 and the nozzle member 339, the sound deadening material 308, and the pressing member 328 is in a straight line. Therefore, the end 303 of the conduit 314 and the base 337 of the injection head body 301 are connected by the first screw 312, and the base 337 of the injection head body 301 and the base end 306 of the nozzle member 339 are connected by the second screw 307. Workability is good. This good connection workability means that in many cases, the injection head 300 and the sound deadening means 302 have a higher ceiling than a person in a fire extinguishing target section of the building where the movement of people is not an obstacle. It is important in view of being connected to such places as.

At the time of extinguishing a fire, the high-pressure fire extinguishing gas injected through the nozzle hole 304 gradually passes through the fine voids of the sound deadening material 308, that is, smoothly and smoothly, and expands under reduced pressure, reducing the generation of sound. It is suppressed and sprayed into the space inside the fire extinguishing area in the building. The fire extinguishing gas from the peripheral surface 324 of the sound deadening material 308 is jetted horizontally and radially near the ceiling, and can be uniformly and quickly diffused over the entire space in the fire extinguishing target section. Therefore, quick fire extinguishing of the fire extinguishing target section can be achieved.

With this sound deadening material 308, it is possible to achieve a large sound reduction effect while reducing the size of the configuration.

In the above-described embodiment, the muffling means 302 having a complicated structure as compared with the injection head 300 can be attached to and detached from various injection heads 300 having different nozzle hole 304 diameters by bolts 327. , Can be commonly used for various injection heads 300. This sharing facilitates mass production of the muffling means 302 and improves productivity.

In addition, depending on whether or not there is a need for sound extinguishing in the fire extinguishing target area, individual selective use is possible, and in the fire extinguishing target area where there is no need for sound extinguishing, the gas fire extinguishing equipment can be removed. It can be simplified. Furthermore, the muffling means 302 removed from the fire extinguishing target section where the need for muffling is no longer required can be attached to another fire extinguishing target section to be muffled and reused, which is economical and energy-saving. Is planned.

In another embodiment of the present invention, the injection head 300 and the sound deadening means 302 may be configured integrally, that is, so as not to be removable. In this embodiment, the base portion 337 of the injection head main body 301 is provided at the end portion 303 of the conduit 314 so as to be removable and replaceable by the first screw 312, and various injection heads 300 having different nozzle hole 304 diameters are individually provided. You may select and use it.

Further, the injection head 300 and the sound deadening means 302 are connected in advance by the second screw 307 and the mounting member 327 to form an assembly, and then the base 337 of the injection head main body 301 in this assembly is connected to the end of the conduit 314. The workability of connecting to the portion 303 with the first screw 312 is also good.

Further, in order to make the existing fire extinguishing target section in which the base portion 337 of the injection head main body 301 is connected to the end portion 303 of the conduit 314 by the first screw 312 as a fire extinguishing target section to be extinguished, the outside of the injection head main body 301. When the sound deadening means 302 is connected to the facing flange 338 by the mounting member 327, the workability of the connection is also good.

There is a gap between the inner peripheral surface of the insertion hole 310 of the sound deadening material 308 and the outer peripheral surface of the tubular portion 340 of the nozzle member 339. When the fire extinguishing gas is injected from the nozzle hole 304, fine foreign matter is stored and stored in the gap, so that clogging of the nozzle hole 304 due to the foreign matter can be prevented and noise due to clogging of the foreign matter can be prevented. It is possible to prevent a decrease in the flow rate at the time of generation and release.

Foreign matter is present in the conduit 314, for example, the scale and slag from welding in the conduit 314, when the conduit is a plated tube, the stripped pieces of the plated layer in the plated tube, rust, and the sealant used in the fitting. Debris etc. Further, due to the decompression inside the injection head 100 and the release of the fire extinguishing gas outward in the radial direction, the injection reaction force acting from the injection head 100 to the conduit 14 in the rear direction (left side in FIG. 19) at the time of the fire extinguishing gas injection is applied. It can be reduced to about 1/9 of the conventional technique shown in FIG.

In another embodiment of the present invention, the inner peripheral surface of the insertion hole 310 of the sound deadening material 308 and the nozzle member 33
It is in close contact with the outer peripheral surface of the tubular portion 340 of 9. It was confirmed by the present inventor that the muffling effect is improved by this configuration. The experiment and its results are described below with reference to FIGS. 20 and 21.

FIG. 20 is a cross-sectional view showing an injection nozzle 500 and sound deadening means 502 and 502a for which an experiment was conducted by the present inventor. In FIG. 20 (1), fire extinguishing gas is _{N 2} gas from conduit 514 is injected from the nozzle hole 504 of the injection head 500. Eleven sound deadening materials 508 are packed and stored in the linear housing 551 of the sound deadening means 502 attached to the injection head 500. The fire extinguishing gas that has passed through the sound deadening material 508 is discharged from the discharge hole 52 of the housing 551 into the space in the fire extinguishing target section. The sound deadening material 508 comes into close contact with the flat end surface of the outlet end of the nozzle hole 504 of the injection head 500.

The supply pressure of the fire extinguishing gas supplied from the conduit 514 to the injection nozzle 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the fire extinguishing gas is about 55 m ³ / min, and the flow velocity of the fire extinguishing gas discharged from the nozzle hole 504. Is about 60 to 100 m / sec. The porosity of the voids of the sound deadening material 508 used in this experiment is about 97%, the diameter is about 130 mm, and the thickness is 10 mm / sheet.

In FIG. 20 (2), the sound deadening material 508 of the sound deadening means 500a is arranged with a gap of about 1 mm 553 from the flat end surface of the outlet end of the nozzle hole 504 of the injection head 500, and the other configurations are shown in FIG. 21 (1). ) Is the same.

FIG. 21 is a diagram showing the passage of time of the sound pressure level obtained when the present inventor releases the fire extinguishing gas according to the configuration of FIG. Line 554 is the result of an experiment in which the sound deadening material 508 is brought into close contact with the flat end surface of the outlet end of the nozzle hole 504 as shown in FIG. 20 (1), and line 555 is the result of an experiment shown in FIG. 20 (2). This is an experimental result based on a configuration in which the sound deadening material 508 is arranged with a gap 553 from the flat end surface of the outlet end of the nozzle hole 504.

From these experimental results, according to the configuration in which the sound deadening material 508 is in close contact with the flat end surface of the outlet end of the nozzle hole 504 (FIG. 20 (1)), the sound deadening material 508 is arranged with a gap of 553 (FIG. 20). It was confirmed that a large muffling effect of about 12 dB was obtained as compared with (2)). Therefore, it has been found that the sound deadening effect is improved according to the embodiment in which the inner peripheral surface of the insertion hole 310 of the sound deadening material 308 and the outer peripheral surface of the tubular portion 340 of the nozzle member 339 are in close contact with each other. It was.

Therefore, as in the embodiment of FIGS. 17 to 20, a gap 315 is provided between the end surface of the sound deadening material 308 facing the nozzle hole 304 and the end surface of the injection head main body 301 facing the sound deadening material 308. At this time, by setting the interval in the direction of the axis L303 to a range in which the muffling effect does not decrease, for example, 0.1 mm to 1.5 mm, clogging of the muffling material 308 due to foreign matter is prevented without substantially reducing the muffling effect. can do.

The gas fire extinguishing device of the present invention releases fire extinguishing gas as a fire extinguishing agent into the space in the fire extinguishing target section of the building when a fire occurs, so that the fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target section to extinguish the fire. It can be carried out extensively.

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas toward a space in a fire extinguishing target section in a building. The fire extinguishing gas injection device discharges fire extinguishing gas from an injection head 300 and the injection head 300. The muffling means 302 has a muffling means 302 for attenuating the sound generated by the gas, and the muffling means 302 is provided with a muffling material 308 as a first muffling member provided on the injection head 300 side and a downstream side of the first muffling member. It has a sound deadening material 308 as a second sound deadening member, and each of the first and second sound deadening members is formed in a flat plate shape and is made of a porous material through which gas can flow. The first and second sound deadening members are laminated to form a cylindrical shape. The first and second sound deadening members have the same outer diameter. The first and second sound deadening members have the same thickness. The entire outer peripheral surface of the first and second sound deadening members is exposed to the atmosphere. A plate-shaped pressing member 328 for fixing the second sound deadening member is further provided.

FIG. 22 is a perspective view showing a part of the configuration including the injection head 400 and the sound extinguishing means 402 of the gas fire extinguishing device according to the embodiment of the present invention. The gas fire extinguishing device of the present embodiment is provided on the wall in the fire extinguishing target section of the building, and the injection head 400 for injecting high-pressure fire extinguishing gas toward the space in the fire extinguishing target section is connected to the injection head 400. A conduit 14 that guides a high-pressure fire extinguishing gas to the injection head 400, a fire extinguishing gas supply source 15 that supplies a high-pressure fire extinguishing gas to the conduit 14, and a nozzle hole 404 formed in the injection head 400 (see FIG. 24 described later). Includes a muffling means 402 that attenuates the sound generated by the injection of the fire extinguishing gas injected from.

The fire extinguishing gas is realized by a non-combustible gas such as _{N 2} gas, CO _{2 gas and halide gas.} Such fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target section having a fire extinguishing gas reach of 15 m or more, and the space in the fire extinguishing target section is uniformly reached to a predetermined fire extinguishing agent concentration in a short time. You can let it extinguish the fire.

The injection head 400 and the muffling means 402 form a fire extinguishing gas injection unit 411. In such a fire extinguishing gas injection unit 411, the fire extinguishing gas is supplied from the fire extinguishing gas supply source 15 to the injection head 400 via the conduit 14. The conduit 14 includes a main pipe 23 connected to the fire 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 extinguishes a fire through such a pipe 14. High-pressure fire extinguishing gas from the gas supply source 15 is guided to the injection head 400. The conduit 14 is fastened to the base 20 and the 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.

FIG. 23 is a perspective view showing the injection head 400 and the sound deadening means 402, and FIG. 24 is a cross-sectional view showing the injection head 400 and the sound deadening means 402. The injection head 400 having a sound extinguishing function is installed on the wall in order to release the fire extinguishing gas to the fire extinguishing target section in the gas-based fire extinguishing equipment using the fire extinguishing gas. It is composed of.

The mounting auxiliary member 403 has a base portion 405 and an outward flange 406 connected to the base portion 405. The base portion 405 is detachably attached to the injection head main body 401 by screws 407. A nozzle member 409 in which a nozzle hole 404, which is a choke, is formed is detachably attached to the attachment auxiliary member 403 by a screw 410. The nozzle hole 404 limits the flow rate of the fire extinguishing gas to a desired value.

The sound deadening means 402 is composed of a sound deadening material 408 made of a porous material through which gas can flow. The sound deadening material 408 has a plurality of members each having a thin disk shape and a thin annular shape, and these members are laminated. The overall shape of the laminated sound deadening material 408 is substantially columnar. For such a sound deadening material 408, a porous material having different density of voids is appropriately selected according to the flow conditions of the fire extinguishing gas such as the diameter and length of the nozzle holes 404, the number of the nozzle holes 404, and the formation position. Can be used.

In the nozzle member 409, a gap 415 is formed between the end surface of the outlet portion of the nozzle hole 404 and the sound deadening material 408 to retain and store foreign matter such as fine rust from the nozzle hole 404, whereby the sound deadening material 408 is formed. Prevents clogging due to foreign matter.

The end face 420 on one side (left side of FIGS. 24 and 25) of the sound deadening material 408 is a guide member 421.
It is arranged so as to be in contact with the annular mounting portion 422 of the above and facing the outward flange 406 of the mounting auxiliary member 403. The guide member 421 has a mounting portion 422, a short tubular guide portion 423 connected to the mounting portion 422 and guiding the fire extinguishing gas, and an expansion portion 443 described later.

The end surface 425 on the other side (right side of FIGS. 24 and 25) of the sound deadening material 408 is a ring-shaped presser foot for fixing the sound deadening material 408 to the outward flange 406 of the mounting auxiliary member 403 via a mounting member 427 such as a bolt. Except for the portion in contact with the member 428, it is open to the atmosphere. The shaft portion of the mounting member 427 is screwed onto the outward flange 406 of the mounting auxiliary member 403 by inserting the pressing member 428, the sound deadening material 408, and the mounting portion 422 of the guide member 421.

The peripheral surface 424 of the sound deadening material 408 is closely surrounded by a short tubular shape, more specifically, a cylindrical inner peripheral surface of the guide portion 423 of the guide member 421. The guide portion 423 is formed so as to expand outward in the radial direction as the expansion portion 443 is located downstream of the pressing member 428 in the injection direction of the fire extinguishing gas and moves away from the downstream side, that is, in a substantially truncated cone shape.

Since the guide member 421 has the expansion portion 443, the fire extinguishing gas released from the end face on the other side in the axial direction of the sound deadening material 408 diffuses outward in the radial direction with respect to the axis L403 of the injection head 400 immediately after the release. Is suppressed, the fire extinguishing gas can reach a long distance, and the required amount of fire extinguishing gas can be released within the fire extinguishing target section.

As shown in FIG. 25, the mounting portion 422 of the guide member 421 fits into the mounting seat 431 formed by annularly recessing the outward flange 406 of the mounting auxiliary member 403, and is radially inward from the mounting seat 431. It protrudes from the end surface 432 (lower part of FIG. 25) by the gap ΔL4.

The end face 420 on one side (left side of FIGS. 24 and 25) of the sound deadening material 408 is arranged in contact with the annular mounting portion 422 of the guide member 421 and facing the outward flange 406 of the mounting auxiliary member 403. The end face 420 on one side (left side of FIGS. 24 and 25) of the sound deadening material 408 has a gap ΔL4 with the end face 432 of the outward flange 406 of the mounting auxiliary member 403, and is therefore arranged in contact with the injection head body 401. It is not a configuration to be installed.

The mounting auxiliary member 403 has a base portion 405 and an outward flange 406 connected to the base portion 405. The base portion 405 is detachably attached to the injection head main body 401 by a screw 407.

The sound deadening means 402 is composed of a sound deadening material 408 made of a porous material through which gas can flow. The sound deadening material 408 has a plurality of members each having a thin disk shape and a thin annular shape, and these members are laminated. The overall shape of the laminated sound deadening material 408 is substantially columnar.

A nozzle member 409 is attached to the attachment auxiliary member 403 by a screw 410. The nozzle member 409 has a nozzle hole 404 that is a choke.

FIG. 25 is a partially enlarged cross-sectional view showing a state in which the guide member 421 is sandwiched between the mounting auxiliary member 403 and the sound deadening material 408. The end face 420 on one side (left side of FIGS. 24 and 25) of the sound deadening material 408 is arranged in contact with the annular mounting portion 422 of the guide member 421 and facing the outward flange 406 of the mounting auxiliary member 403. .. The guide member 421 has a mounting portion 422 and a short tubular guide portion 423 that is connected to the mounting portion 422 and guides the fire extinguishing gas.

The peripheral surface 424 of the sound deadening material 408 and the end surface 425 on the other side (right side of FIGS. 23 and 24) are holding members 428 that fix the sound deadening material 408 to the outward flange 406 of the mounting auxiliary member 403 via the mounting member 427. It is open to the atmosphere except for the part in contact with. Mounting member 42
The shaft portion of No. 7 is screwed to the outward flange 406 of the mounting auxiliary member 403 by inserting the pressing member 428, the sound deadening material 408, and the mounting portion 422 of the guide member 421.

As shown in FIG. 25, the mounting portion 422 of the guide member 421 fits into the mounting seat 431 formed by being annularly recessed in the outward flange 406 of the mounting auxiliary member 403, and is radially inward from the mounting seat 431. A gap ΔL1 projects in the axial direction from the end surface 432 (lower part of FIG. 25).

With reference to FIG. 24 again, in the injection head 400, the injection head main body 401 has a substantially cylindrical base portion 437 and an engaging portion 438 connected to the outer periphery of the base portion 437. The engaging portion 438 of the injection head 400 is detachably connected to the end portion 14a of the conduit 14 by the first screw 412 which is a taper screw.

The mounting auxiliary member 403 is detachably and replaceably provided on the base 437 of the injection head main body 401. Various injection head main bodies 401 having different diameters of the nozzle holes 404 are individually selected and used depending on the length of the conduit 14 and the like. The reason will be described.

The gas fire extinguishing device should quickly fill the space in the fire extinguishing area with fire extinguishing gas while ensuring a large flow rate (for example, 20,000 to 100,000 liters / minute) required for fire extinguishing, which is its original role. It must be configured to ensure a high flow velocity (eg 100 m / s) to release the extinguishing gas. Therefore, the Fire Fighting Law Enforcement Regulations stipulate that the radiation pressure of the fire extinguishing gas from the nozzle hole 404 of the injection head 400 in the gas fire extinguishing device is 1.9 MPa or more, and in practice, it is 2 to 3 MPa (≈20 to 30 kgf /). cm ^2, Note, carried out at high radiation pressures further to as high 6MPa ≒ 60kgf / cm ^2).

Therefore, the value of the diameter of the nozzle hole 404 of the injection head 400 is set from the fire extinguishing gas supply source 15 so that the fire extinguishing gas injected from the nozzle hole 404 achieves the above-mentioned large flow rate, high flow velocity, and high radiation pressure. It must be set depending on the length of the conduit 14 to the installation location of 400 and therefore the conduit resistance.

Therefore, the diameter of the nozzle hole 404 differs depending on the length of the conduit 14, and therefore, various injection heads 400 having different diameters of the nozzle hole 404 are individually selected and used for each installation location of the injection head 400. Must. As described above, in the gas fire extinguishing device, various injection heads 400 having different diameters of the nozzle holes 404 are indispensable.

The sound deadening means 402 has a plurality of sound deadening materials 408, a pressing member 428, and a mounting member 427. The sound deadening material 408 is made of a porous material through which a gas can flow, and is made of a porous metal obtained by sintering fine metal powder or a fine metal wire, for example, and smoothly and slowly extinguishes a high-pressure fire gas. The sound deadening effect can be effectively realized without reducing the flow rate by decompression expansion, and the sound deadening material 408 may be formed by laminating, for example, a plurality of layers of wire mesh, and is a plate made of synthetic resin fibers. It may be a shaped molded product or a porous member.

The sound deadening material 408 is formed in the shape of a flat plate such as a disk, and a plurality of sheets are laminated. Each of the overall shapes of the laminated sound deadening material 408 is, for example, a columnar shape. The peripheral surface 424 of the laminated sound deadening material 408 is closely surrounded by the cylindrical inner peripheral surface of the guide portion 423 of the guide member 421, and is therefore not open to the atmosphere.

The pressing member 428 presses the end surface 425 on the other side (right side in FIG. 24) of the laminated sound deadening material 408. The pressing member 428 has a flat plate shape and has a peripheral surface 426 extending along the peripheral surface 424 of the sound deadening material 408.

The mounting member 427 is, in this embodiment, a bolt as a threaded member and is shown using the same reference numerals. A plurality (for example, 6) mounting members 427 are arranged around the axis L403 at equal intervals. The shaft portion of the mounting member 427 is inserted with bolt insertion holes formed in the pressing member 428 and the sound deadening material 408, respectively, and the head portion of the mounting member 427 is on the opposite side of the pressing member 428 from the sound deadening material 408 (FIG. 24). Lock to the right side of).

The male screw formed on the shaft portion of the mounting member 427 is drilled in the outward flange 406 of the mounting auxiliary member 403 and engraved, so that the male screw is removably screwed to the screw. As a result, the mounting member 427 holds and fixes the laminated sound deadening material 408 between the mounting auxiliary member 403 and the pressing member 428, and thus between the injection head main body 401 and the pressing member 428.

Each axis of the mounting member 427 is parallel to the axis L403 of the end 14a of the conduit 14. The axes of the end portion 14a of the conduit 14, the injection head 400, and the sound deadening means 402 are in a straight line. With the sound deadening means 402 attached to the injection head 400, the workability of connecting the base portion 437 of the injection head main body 401 to the end portion 14a of the conduit 14 with the first screw 412 is good.

The axis L403 of the end portion 14a of the conduit 14 is such that the axis L403 of the injection head 400 including the injection head main body 401, the sound deadening material 408, and the pressing member 428 are in a straight line. Therefore, the workability of the connection between the end portion 14a of the conduit 14 and the base portion 437 of the injection head main body 401 by the first screw 412 and the connection between the base portion 437 of the injection head main body 401 and the mounting auxiliary member 403 by the second screw 407 is improved. , Good. This good connection workability means that in many cases, the injection head 400 and the sound deadening means 402 have a higher ceiling than a person in a fire extinguishing area in a building where the movement of people is not an obstacle. It is important in view of being connected to such places as.

At the time of extinguishing a fire, the high-pressure fire extinguishing gas injected through the nozzle hole 404 gradually passes through the fine voids of the sound deadening material 408, that is, smoothly and smoothly, and expands under reduced pressure, reducing the generation of sound. It is suppressed and sprayed into the space inside the fire extinguishing area in the building. The fire extinguishing gas from the peripheral surface 424 of the sound deadening material 408 is jetted horizontally and radially near the ceiling, and can be uniformly and quickly diffused over the entire space in the fire extinguishing target section. Therefore, quick fire extinguishing of the fire extinguishing target section can be achieved.

With this sound deadening material 408, it is possible to achieve a large acoustic reduction effect while reducing the size of the configuration.

In the above-described embodiment, the sound deadening means 402 having a complicated structure as compared with the injection head 400 can be attached to and detached from various injection heads 400 having different diameters of the nozzle holes 404 by the mounting member 427. Can be commonly used for various injection heads 400. By this sharing, mass production of the sound deadening material 408 is easy, and productivity is improved.

In addition, depending on whether or not there is a need for sound extinguishing in the fire extinguishing target area, individual selective use is possible, and in the fire extinguishing target area where there is no need for sound extinguishing, the gas fire extinguishing equipment can be removed. It can be simplified. Furthermore, the muffling means 402 removed from the fire extinguishing target section where the need for muffling is no longer required can be attached to another fire extinguishing target section to be muffled and reused, which is economical and energy-saving. Is planned.

In another embodiment of the present invention, the injection head 400 and the sound deadening means 402 may be configured integrally, that is, so as not to be removable. In this embodiment, the base portion 437 of the injection head main body 401 is provided at the end portion 14a of the conduit 14 so as to be removable and replaceable by the first screw 412, and various injection heads 400 having different diameters of the nozzle holes 404 are individually provided. You may choose to use it.

Further, the sound deadening means 402 and the injection head 400 are connected in advance by the second screw 407 and the mounting member 427 to form an assembly, and then the base 437 of the injection head main body 401 in this assembly is connected to the end of the conduit 14. The workability of connecting to 14a with the first screw 412 is also good.

Further, in order to make the existing fire extinguishing target section in which the base 437 of the injection head main body 401 is connected to the end portion 14a of the conduit 14 by the first screw 412, the fire extinguishing target section to be muted, the injection head main body 401 is connected. When the sound deadening means 402 is connected by the mounting member 427, the workability of the connection is also good.

There is a gap 415 between the end face of the sound deadening material 408 facing the nozzle hole 404 and the end face of the nozzle member 409 facing the sound deadening material 408. When the fire extinguishing gas is injected from the nozzle hole 404, fine foreign matter is stored and stored in the gap 415, so that it is possible to prevent clogging of the sound deadening material 408 by the foreign matter and noise due to clogging of the foreign matter. It is possible to prevent a decrease in the flow rate at the time of generation and release.

Foreign matter is present in the conduit 14, for example, the scale and slag from welding in the conduit 14, when the conduit is a plated tube, the strips of the plated layer in the plated tube, rust, and the sealing material used in the fitting. Debris etc. Further, due to the decompression inside the injection head 400 and the release of the fire extinguishing gas outward in the radial direction, the injection reaction force acting from the injection head 400 to the conduit 14 in the rear direction (left side in FIG. 24) at the time of the fire extinguishing gas injection is applied. It can be reduced by about 1/9 of the conventional technique shown in FIG.

In another embodiment of the present invention, the sound deadening of the injection head 700 in which the end face disposed on the nozzle hole 404 side of the sound deadening material 408 in the above-described embodiment, the injection head main body 401, and the mounting auxiliary member 403 are integrated. It has been confirmed by the present inventor that the muffling effect does not decrease even if the end face arranged so as to face the material 408 is separated. The experiment and its results are described below with reference to FIGS. 26 and 27.

FIG. 26 is a cross-sectional view showing the injection head 700 and the sound deadening means 701 and 701a in which the experiment was conducted by the present inventor, and FIG. 27 is obtained when the present inventor releases a fire extinguishing gas according to the configuration of FIG. It is a figure which shows the time passage of the sound pressure level. In Figure 26 (1), fire extinguishing gas is _{N 2} gas from conduit 714 is injected from the nozzle hole 704 of the injection head 700.

Three sound deadening materials 706 are laminated and arranged on the downstream side (right side in FIG. 26) of the nozzle member 703 attached to the injection head 700 in the discharge direction of the fire extinguishing gas. The fire extinguishing gas passes through the nozzle hole 704 of the nozzle member 703, flows into the sound deadening material 706, and is discharged from the other end surface 709 of the sound deadening material 706 in the axial direction from the discharge hole 752 of the presser member 728 into the space in the fire extinguishing target section. Will be done. The sound deadening material 706 comes into close contact with the flat end surface of the outlet end of the nozzle hole 704 of the nozzle member 703.

The supply pressure of the fire extinguishing gas supplied from the conduit 714 to the injection head 700 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the fire extinguishing gas is about 55 m ³ / min, and the flow velocity of the fire extinguishing gas discharged from the nozzle hole 704. Is about 60 to 100 m / sec. The porosity of the voids of the sound deadening material 706 used in this experiment is about 97%, the diameter is about 130 mm, and the thickness is 10 mm / sheet.

In FIG. 26 (2), the sound deadening material 706 of the sound deadening means 701a is arranged with a gap 753 of about 1 mm in the axial direction from the flat end surface of the outlet end of the nozzle hole 704 of the nozzle member 703, and the other configurations are as follows. It is the same as FIG. 26 (1).

FIG. 27 is a diagram showing the passage of time of the sound pressure level obtained when the present inventor releases the fire extinguishing gas according to the configuration of FIG. 26. Line 754 is the result of an experiment in which the sound deadening material 706 is brought into close contact with the flat end surface of the outlet end of the nozzle hole 704 as shown in FIG. 26 (1), and line 755 is the result of an experiment shown in FIG. 26 (2). This is an experimental result based on a configuration in which the sound deadening material 705 is arranged with a gap 753 from the flat end surface of the outlet end of the nozzle hole 704.

From these experimental results, according to the configuration in which the sound deadening material 706 is in close contact with the flat end surface of the outlet end of the nozzle hole 704 (FIG. 26 (1)), the sound deadening material 706 is arranged with a gap 753 (FIG. 26). It was confirmed that there was almost no difference in the muffling effect as compared with (2)). Therefore, it was confirmed that the muffling effect does not decrease even if a gap 753 is provided between the end face of the muffling material 706 facing the nozzle hole 704 and the end face of the injection head 700 facing the muffling material 706.

By providing such a gap 753 between the end face of the sound deadening material 706 facing the nozzle hole 704 and the end face of the injection head 700 facing the sound deadening material 706, fine foreign matter can be removed without reducing the sound deadening effect. When the fire extinguishing gas is stored and stored in the gap 753 and the fire extinguishing gas is injected from the nozzle hole 704, it is possible to prevent clogging of the sound deadening material 706 by foreign matter and prevent generation of noise due to clogging of foreign matter. Foreign matter is present in the conduit 14, for example, scales and slags from welding in the conduit 14, and when the conduit 14 is a plated tube, stripped pieces of the plated layer in the plated tube, rust, and sealing material used in fittings. Such as fragments of.

Therefore, as in the embodiment of FIGS. 22 to 26, a gap 415 is provided between the end surface of the sound deadening material 408 facing the nozzle hole 404 and the end surface of the injection head main body 401 facing the sound deadening material 408. At this time, by setting the interval ΔL2 in the direction of the axis L403 to a range in which the muffling effect does not decrease, for example, 0.1 mm to 1.5 mm, the muffling material 408 is clogged with foreign matter without substantially reducing the muffling effect. Can be prevented.

FIG. 28 is a cross-sectional view showing the injection head 500 and the sound deadening means 502 and 502a in which the experiment was conducted by the present inventor. In Figure 28 (1), fire extinguishing gas is _{N 2} gas from conduit 514 is injected from the nozzle hole 504 of the injection head 500.

Eleven sound deadening materials 508 are laminated and stored in the linear cylindrical housing 551 of the sound deadening means 502 attached to the injection head 500. The fire extinguishing gas that has passed through the sound deadening material 508 is discharged from the discharge hole 552 of the housing 551 into the space in the fire extinguishing target section. The sound deadening material 508 comes into close contact with the flat end surface of the outlet end of the nozzle hole 504 of the injection head 500.

The supply pressure of the fire extinguishing gas supplied from the conduit 514 to the injection head 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the fire extinguishing gas is about 55 m ³ / min, and the flow velocity of the fire extinguishing gas discharged from the nozzle hole 504. Is about 60 to 100 m / sec. The porosity of the voids of the sound deadening material 508 used in this experiment is about 97%, the diameter is about 130 mm, and the thickness is 10 mm / sheet.

In FIG. 28 (2), the sound deadening material 508 of the sound deadening means 502a is arranged with a gap 553 of about 1 mm from the flat end surface of the outlet end of the nozzle hole 504 of the injection head 500, and the other configurations are shown in FIG. 28 (2). It is the same as 1).

FIG. 29 is a diagram showing the passage of time of the sound pressure level obtained when the present inventor releases the fire extinguishing gas according to the configuration of FIG. 28. Line 554 is an experimental result with a configuration in which the sound deadening material 508 is brought into close contact with the flat end surface of the outlet end of the nozzle hole 504 as shown in FIG. 28 (1), and line 555 is the result of an experiment in that it is in close contact with the flat end surface of the outlet end. As described above, it is an experimental result with a configuration in which the sound deadening material 508 is arranged with a gap 553 from the flat end surface of the outlet end of the nozzle hole 504.

From these experimental results, according to the configuration in which the sound deadening material 508 is in close contact with the flat end surface of the outlet end of the nozzle hole 504 (FIG. 28 (1)), the sound deadening material 508 is arranged with a gap of 553 (FIG. 28). It was confirmed that a large muffling effect of about 16 dB was obtained as compared with (2)). Therefore, it is confirmed that the muffling effect is improved according to the embodiment in which the end face of the muffling material 508 facing the nozzle hole 504 and the end face of the injection head 500 facing the muffling material 508 are in close contact with each other. Was done.

FIG. 30 is a cross-sectional view showing a gas fire extinguishing device according to another embodiment of the present invention. In the sound extinguishing means 600 of this gas fire extinguishing device, the above-mentioned guide member 421 is omitted. The function of the guide member 421 will be described with reference to FIG.

The fire extinguishing gas from each of the plurality of nozzle holes 609 formed uniformly distributed over the entire surface of the flat plate-shaped nozzle portion 608 of the injection head main body 601 is injected along the axes parallel to each other of each nozzle hole 609. It gradually passes through the fine voids of the sound deadening material 613 and the sound deadening material 610 arranged downstream of the nozzle hole 609, that is, smoothly and smoothly, and expands under reduced pressure. Each axis of the injection head main body 601 and the sound deadening material 613 is in a straight line. The fine voids in the sound deadening material 613 give pressure loss to the fire extinguishing gas passing through them.

Assuming that the path followed by the fire extinguishing gas injected from each nozzle hole 609 of the injection head body 601 into the sound deadening material 613 is a straight line for simplification, the sound deadening material 613 has an almost straight columnar shape as a whole. The path length to the most downstream end face of is indicated by reference numeral L601 in FIG.

The path length from the side portion of the injection head main body 601 to the peripheral surface 614 of the sound deadening material 613 is indicated by reference numeral L602 in FIG. In order to increase the flow rate of the fire extinguishing gas injected from the nozzle hole 609, when the outer diameter of the injection head main body 601 is configured to be relatively large with respect to the axial length of the sound deadening material 613, L601> L602.

The pressure loss acting on the fire extinguishing gas is proportional to these path lengths L601 and L602, and therefore the distribution of the pressure loss in the sound deadening material 613 is as shown by the isobars 603 in which the positions where the equal pressure loss occurs are connected. The pressure loss is the largest in the region on the axis of the sound deadening material 613, and becomes smaller in the peripheral region away from the axis.

Since the fire extinguishing gas injected from the nozzle hole 609 easily flows through the region where the pressure loss is small, the fire extinguishing gas in the sound deadening material 613 is indicated by the reference mark 604 of the virtual line in the axial direction of the injection head main body 601. As indicated by the reference mark 605, it also proceeds laterally as indicated by the reference mark 605, and further proceeds in the backward direction as indicated by the reference mark 606. The lengths of the reference numerals 604, 605, and 606 are shown corresponding to the flow rate of the fire extinguishing gas, and a relatively large flow rate of the fire extinguishing gas flows in the lateral and back directions.

In order to quickly fill the fire extinguishing target section with the fire extinguishing gas, a virtual line is drawn along the axial direction of the injection head main body 601 from the sound deadening material installed near the wall surface (left side in FIG. 30) among the plurality of sound deadening materials 610. Inject as much flow as possible in the direction indicated by reference numeral 604 and laterally in the direction indicated by reference numeral 605, and suppress the flow rate of the extinguishing gas traveling in the direction behind as indicated by reference numeral 606. There must be.

In each of the above-described embodiments related to the above-mentioned FIGS. 22 to 29 of the present invention, the guide member 421 is a fire extinguishing gas that travels in the direction 606 behind FIG. 30 among the fire extinguishing gases injected from the sound deadening material 613. Is prevented, and the injection head is advanced in the axial direction 604 and the side 605 of the injection head main body 601 of the injection head. As a result, even in a large-scale fire extinguishing target section where the fire extinguishing gas reach is 15 m or more, the fire extinguishing gas is sufficiently diffused and the space in the fire extinguishing target section is uniformly adjusted to a predetermined fire extinguishing agent concentration in a short time. You will be able to reach it and extinguish the fire.

The gas fire extinguishing device of the present invention releases fire extinguishing gas as a fire extinguishing agent into the space in the fire extinguishing target section of the building when a fire occurs, so that the fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target section to extinguish the fire. It can be carried out extensively.

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas toward a space in a fire extinguishing target section in a building. The fire extinguishing gas injection device discharges fire extinguishing gas from an injection head 400 and the injection head 400. The muffling means 402 is provided on the injection head 400 side and is provided on the downstream side of the first muffling member and the muffling material 408 as the first muffling member. It has a sound deadening material 408 as a second sound deadening member, and each of the first and second sound deadening members is formed in a flat plate shape and is made of a porous material through which gas can flow. The first and second sound deadening members are laminated to form a cylindrical shape. The first and second sound deadening members have the same outer diameter. The first and second sound deadening members have the same thickness. The entire outer peripheral surface of the first and second sound deadening members is exposed to the atmosphere. A plate-shaped pressing member 428 for fixing the second sound deadening member is further provided.

(Appendix 1 Invention)
Appendix 1 The invention is
(A) An injection head 100 having a nozzle hole 104 for injecting a high-pressure fire extinguishing gas toward a space in a fire extinguishing target section in a building.
(B) A conduit 14 having an end portion 14a to which the injection head 100 is connected and guiding a high-pressure fire extinguishing gas to the injection head 100,
(C) A fire extinguishing gas supply source 15 that supplies a high-pressure fire extinguishing gas to the conduit 14 and
(D) A gas fire extinguishing device provided in the injection head 100 and including a sound extinguishing means 102 for attenuating sound due to emission of fire extinguishing gas from a nozzle hole 104.
(E) The injection head 100
(E1) An injection head main body 101 connected to the end portion 14a of the conduit 14 and
(E2) It has a mounting auxiliary member 103 that is detachably attached to the injection head main body 101.
(F) The muffling means 102
(F1) A rectifying member 109 having a rectifying hole 112 and detachably provided in the mounting auxiliary member 103 so as to cover the nozzle hole 104 of the injection head main body 101.
(F2) A first sound deadening material 113 which is formed in a flat plate shape and is made of a porous material through which gas can flow, and a plurality of sheets are laminated and arranged between the rectifying member 109 and the injection head main body. ,
(F3) It is made of a porous material formed in a flat plate shape and capable of flowing gas, and has a second sound deadening material 108 which is arranged on a rectifying member 109 by stacking a plurality of sheets in the direction of releasing fire extinguishing gas. It is a gas fire extinguishing device characterized by this.

According to the invention of Appendix 1, the high-pressure fire extinguishing gas supplied from the fire extinguishing gas supply source 15 to the conduit 14 is injected toward the space in the building through the injection head 100. Such an injection head 100 is provided with a muffling means 102, and it is possible to prevent the generation of a large injection sound due to the injection flow of the fire extinguishing gas injected from the nozzle hole 104 of the injection head 100 at a high speed.

The fire extinguishing gas flows from the conduit 14 through the nozzle hole 104 of the injection head 100, the first sound deadening material 113, and the rectifying member 109, flows into the second sound deadening material 108, and passes through the fine voids of the second sound deadening material 108. It is decompressed and expanded, and is injected into the space inside the fire extinguishing area in the building.

Regarding the large acoustic reduction effect due to the small structure, the high-pressure fire extinguishing gas injected through the nozzle hole 104 at the time of extinguishing the fire is decompressed and expanded by passing through the fine voids of the first sound deadening material 113, and the rectifying member. After being rectified through the rectifying hole 112 of 109, it flows into the second sound deadening material 108 and further decompresses and expands, thereby gradually and smoothly decompressing and expanding without reducing the flow rate of the fire extinguishing gas, and the generation of sound is effective. Is suppressed. In this way, it is possible to achieve a large sound reduction effect while reducing the size of the configuration.

Each of the plurality of first and second sound deadening materials 113 and 108 is made of a porous material through which gas can flow, is formed in a flat plate shape, and is laminated and assembled. Therefore, by selecting the number of layers according to the flow rate, pressure, and degree of muffling of the fire extinguishing gas injected into the space in the fire extinguishing target section, the desired characteristics of various injections and muffling can be accurately obtained. It is easy to adjust and obtain. Further, the first and second sound deadening materials 113 and 108 having the same size and shape may be manufactured, and mass production is easy and productivity is improved.

Appendix 1 The invention is characterized in that a gap 115 exists between the end surface of the first sound deadening material 113 on the side facing the nozzle hole 104 and the end surface of the injection head 100 on the side facing the first sound deadening material 113. And.

According to Appendix 1, according to the invention, a gap 115 is provided between the end face of the first sound deadening material 113 on the side facing the nozzle hole 104 and the end face of the injection head on the side facing the first sound deadening material 113, so that a foreign matter is formed. Is stored and stored in the gap 115, so that when the fire extinguishing gas is injected from the nozzle hole 104, the first and second sound deadening materials 113 and 108 are prevented from being clogged by foreign matter, and noise due to clogging of foreign matter is prevented. Occurrence and decrease in flow rate are prevented. Foreign matter is present in the conduit 14, for example, scales and slags from welding in the conduit 14, and when the conduit 14 is a plated tube, stripped pieces of the plated layer in the plated tube, rust, and sealing material used in fittings. Such as fragments of.

Appendix 1 The invention is characterized in that the peripheral surface 124 of the laminated second sound deadening material 108 is open to the atmosphere.

According to Appendix 1, since the peripheral surface 124 of the second sound deadening material 108 is open to the atmosphere, the area where the fire extinguishing gas is released is large, which suppresses a decrease in the flow rate of the fire extinguishing gas and is used for gas release. It is possible to secure the required flow rate and flow velocity without increasing the cross-sectional area of the flow path, and the configuration is further miniaturized.

(Appendix 1 Effect of the Invention)
According to the invention of Appendix 1, since the injection head 100 is provided with the muffling means 102, it is possible to prevent a loud injection sound from being generated even if a high-pressure fire extinguishing gas is injected from the injection head 100 at the time of a fire. .. Further, each of the plurality of first and second sound deadening materials 113 and 108 is made of a porous material through which gas can flow, is formed in a flat plate shape, and is laminated and assembled. Therefore, by selecting the number of layers according to the flow rate, pressure, and degree of muffling of the fire extinguishing gas injected into the space in the fire extinguishing target section, the desired characteristics of various injections and muffling can be accurately obtained. It is easy to adjust and obtain. Further, the first and second sound deadening materials 113 and 108 having the same size and shape may be manufactured, and mass production is easy and productivity is improved.

Further, according to the Appendix 1, the gap 115 is provided between the end surface of the first sound deadening material 113 on the side facing the nozzle hole 104 and the end surface of the injection head 100 on the side facing the second sound deadening material 108. When fine foreign matter is stored and stored in the gap 115 and the fire extinguishing gas is injected from the nozzle hole 104, the first and second sound deadening materials 113 and 108 are prevented from being clogged by the foreign matter, and the foreign matter is clogged. It is possible to prevent the generation of noise due to the above and prevent the decrease in the flow rate due to clogging at the time of injecting the fire extinguishing gas.

Further, according to the invention of Appendix 1, since the peripheral surface 124 of the second sound deadening material 108 is open to the atmosphere, a decrease in the flow rate of the fire extinguishing gas is suppressed, and the cross-sectional area of the flow path for gas release is not increased. The required flow rate and flow velocity can be secured, and the injection of the fire extinguishing gas is not hindered by obstacles or the like. Therefore, the miniaturized configuration can prevent the generation of a loud injection noise.

(Appendix 2 Invention)
Appendix 2 The invention is
(A) An injection head 200 having a nozzle hole 204 for injecting a high-pressure fire extinguishing gas toward a space in a fire extinguishing target section in a building.
(B) A conduit 14 having an end portion 14a to which the injection head 200 is connected and guiding a high-pressure fire extinguishing gas to the injection head 200,
(C) A fire extinguishing gas supply source 15 that supplies a high-pressure fire extinguishing gas to the conduit 14 and
(D) A gas fire extinguishing device provided in the injection head 200 and including a sound extinguishing means 202 for attenuating sound due to emission of fire extinguishing gas from a nozzle hole 204.
(E) The injection head 200
(E1) An injection head main body 201 connected to the end portion 14a of the conduit 14 and
(E2) Nozzle member 234,
(E2-1) A tubular portion 240 extending along the axis of the end portion 14a of the conduit 14 and having one end in the axial direction connected to the injection head main body 201.
(E2-2) A nozzle member 234 including an end wall 241 which is connected to the other end of the tubular portion 240 in the axial direction to form a nozzle hole 204 and closes the other end of the tubular portion 240 in the axial direction.
(F) The muffling means 202
(F1) The sound deadening material 208, which is formed in a flat plate shape and is made of a porous material through which gas can flow, and a plurality of sheets are laminated, and the end face 220 on one side in the axial direction of the laminated sound deadening material 208. Is a sound deadening material 208 arranged facing the injection head main body 201, and
(F2) A pressing member 228 that presses the end surface 225 on the other side in the axial direction of the laminated sound deadening material 208, and
(F3) The gas fire extinguishing device is characterized by having a mounting member 227 that sandwiches and fixes the sound deadening material 208 between the injection head main body 201 and the pressing member 228.

According to the invention of Appendix 2, the high-pressure fire extinguishing gas supplied from the fire extinguishing gas supply source 15 to the conduit 14 is injected toward the space in the building through the injection head 200. Such an injection head 200 is provided with a muffling means 202, and it is possible to prevent the generation of a large injection noise due to the injection flow of the fire extinguishing gas injected from the nozzle hole 204 of the injection head 200 at a high speed.

The fire extinguishing gas flows into the sound deadening material 208 from the nozzle hole 204 of the injection head 200 from the conduit 14, passes through the fine voids of the sound deadening material 208, expands under reduced pressure, and is injected into the space in the fire extinguishing target section in the building. Will be done.

Regarding the large acoustic reduction effect due to the small configuration, the high-pressure fire extinguishing gas injected through the nozzle hole 204 at the time of extinguishing the fire is decompressed and expanded by passing through the fine voids of the sound deadening material 208, and thus the fire extinguishing gas The pressure is gradually and smoothly decompressed and expanded without reducing the flow rate, and the generation of sound is effectively suppressed. In this way, it is possible to achieve a large sound reduction effect while reducing the size of the configuration.

The plurality of sound deadening materials 208 are made of a porous material through which gas can flow, are formed in a flat plate shape, and are laminated and assembled. Therefore, by selecting the number of layers according to the flow rate, pressure, and degree of muffling of the fire extinguishing gas injected into the space in the fire extinguishing target section, the desired characteristics of various injections and muffling can be accurately obtained. It is easy to adjust and obtain. Further, the sound deadening material 208 having the same size and shape may be manufactured, and mass production is easy and productivity is improved.

Appendix 2 The invention is characterized in that a gap 215 exists between the end surface 220 of the sound deadening material 208 on the side facing the nozzle hole 204 and the end surface 232 of the injection head main body 201 on the side facing the sound deadening material 208. To do.

According to Appendix 2, the gap 215 is provided between the end face of the sound deadening material 208 on the side facing the nozzle hole 204 and the end face of the injection head on the side facing the sound deadening material 208, so that foreign matter enters the gap 215. When the fire extinguishing gas to be stored and stored is injected from the nozzle hole 204, clogging of the sound deadening material 208 due to foreign matter is prevented, and noise generation and a decrease in flow rate due to clogging of foreign matter are prevented. Foreign matter is present in the conduit 14, for example, scales and slags from welding in the conduit 14, and when the conduit 14 is a plated tube, stripped pieces of the plated layer in the plated tube, rust, and sealing material used in fittings. Such as fragments of.

Appendix 2 The invention is characterized in that the peripheral surface 224 of the laminated sound deadening material 208 is open to the atmosphere.

According to Appendix 2, since the peripheral surface 224 of the sound deadening material 208 is open to the atmosphere, the area where the fire extinguishing gas is released is large, whereby the decrease in the flow rate of the fire extinguishing gas is suppressed, and the flow path for gas release. It is possible to secure the required flow rate and flow velocity without increasing the cross-sectional area, and the configuration is further miniaturized.

(Appendix 2 Effect of Invention)
According to the second invention, since the injection head 200 is provided with the muffling means 202, it is possible to prevent a loud injection noise from being generated even if a high-pressure fire extinguishing gas is injected from the injection head 200 at the time of a fire. .. Further, the plurality of sound deadening materials 208 are made of a porous material through which gas can flow, are formed in a flat plate shape, and are laminated and assembled. Therefore, by selecting the number of layers according to the flow rate, pressure, and degree of muffling of the fire extinguishing gas injected into the space in the fire extinguishing target section, the desired characteristics of various injections and muffling can be accurately obtained. It is easy to adjust and obtain. Further, the sound deadening material 208 having the same size and shape may be manufactured, and mass production is easy and productivity is improved.

Further, according to Appendix 2, the gap 215 is provided between the end face of the sound deadening material 208 on the side facing the nozzle hole 204 and the end face of the injection head on the side facing the sound deadening material 208, so that fine foreign matter can be prevented. When the fire extinguishing gas is stored and stored in the gap 215 and the fire extinguishing gas is injected from the nozzle hole 204, the clogging of the sound deadening material 208 due to foreign matter is prevented, the generation of noise due to the clogging of foreign matter is prevented, and the fire extinguishing gas is injected. It is possible to prevent a decrease in the flow rate due to clogging at the time.

Further, according to the invention of Appendix 2, since the peripheral surface 224 of the sound deadening material 208 is open to the atmosphere, a decrease in the flow rate of the fire extinguishing gas is suppressed, and it is necessary without increasing the cross-sectional area of the flow path for gas release. The flow rate and flow velocity are ensured, and the injection of the fire extinguishing gas is not hindered by obstacles or the like. Therefore, the miniaturized configuration can prevent the generation of a loud injection noise.

(Appendix 3 Invention)
Appendix 3 Invention
(A) An injection head 300 having a nozzle hole 304 for injecting a high-pressure fire extinguishing gas toward a space in a fire extinguishing target section in a building.
(B) A conduit 314 having an end 303 to which the injection head 300 is connected and guiding a high-pressure fire extinguishing gas to the injection head 300.
(C) A fire extinguishing gas supply source 315 that supplies a high pressure fire extinguishing gas to the conduit 314, and
(D) A gas fire extinguishing device provided in the injection head 300 and including a sound extinguishing means 302 for attenuating sound due to emission of fire extinguishing gas from a nozzle hole 304.
(E) The injection head 300
(E1) The injection head main body 301.
With a base 337 connected to the end 303 of the conduit 314,
An injection head body 301 having an outward flange 338 connected to a base 337,
(E2) Nozzle member 339,
(E2-1) A tubular portion 340 extending along the axis L303 of the end 303 of the conduit 314, which is connected to a peripheral wall 342 in which a plurality of nozzle holes 304 are formed and one end in the axial direction of the peripheral wall 342 and is injected. A tubular portion 340 having a base end portion 306 connected to a base portion 337 of the head body 301, and a tubular portion 340.
(E2-2) The nozzle member 339 has an end wall 341 that closes the other end of the peripheral wall 342 in the axial direction.
(F) The muffling means 302
(F1) A sound deadening material 308, each sound deadening material 308 is formed in a flat plate shape, a plurality of sheets are laminated, and is made of a porous material through which gas can flow, and an insertion hole 310 through which a tubular portion 340 is inserted. The end surface 320 on one side (upper in FIG. 19) of the laminated sound deadening material 308 in the axial direction is arranged on the outward flange 338 side of the injection head main body 301, and the peripheral surface 324 of the laminated sound deadening material 308 is arranged. Is a sound deadening material 308 that is open to the atmosphere,
(F2) A pressing member 328 that presses the end surface 325 on the other side (lower side of FIG. 19) of the laminated sound deadening material 308, and
(F3) The gas fire extinguishing device is characterized by having a mounting member 327 that sandwiches and fixes the sound deadening material 308 between the outward flange 338 and the pressing member 328.

According to the third invention, the high-pressure fire extinguishing gas supplied from the fire extinguishing gas supply source 315 to the conduit 314 is injected toward the space in the building via the injection head 300. Such an injection head 300 is provided with a muffling means 302, and it is possible to prevent the generation of a large injection noise due to the injection flow of the fire extinguishing gas injected from the nozzle hole 304 of the injection head 300 at a high speed.

The fire extinguishing gas passes from the conduit 314, passes through the nozzle hole 304 formed in the tubular portion 340 of the injection head 300, passes through the fine voids of the sound deadening material 308, expands under reduced pressure, and expands under reduced pressure, and the space in the fire extinguishing target section in the building. Is sprayed on.

Regarding the large acoustic reduction effect due to the small structure, the high-pressure fire extinguishing gas injected through the nozzle hole 304 at the time of extinguishing the fire passes through the fine voids of the sound deadening material 308, thereby passing through the fine voids of the sound deadening material 308. Then, the pressure is gradually expanded, that is, smoothly and smoothly, and the generation of sound is reduced and suppressed. In this way, it is possible to achieve a large sound reduction effect while reducing the size of the configuration. Since the peripheral surface 324 of the sound deadening material 308 is open to the atmosphere, the configuration is further reduced.

Each of the plurality of sound deadening materials 308 is made of a porous material through which gas can flow, is formed in a flat plate shape, and is laminated and assembled. Therefore, by selecting the number of layers according to the flow rate, pressure, and degree of muffling of the fire extinguishing gas injected into the space in the fire extinguishing target section, the desired characteristics of various injections and muffling can be accurately obtained. It is easy to adjust and obtain. Further, the sound deadening material 308 having the same size and shape may be manufactured, and mass production is easy and productivity is improved.

Appendix 3 The invention is characterized in that the mounting member 327 is composed of bolts, the pressing member 328 and the sound deadening material 308 are inserted through the mounting member 327, and the mounting member 327 is screwed into a screw because it is drilled in the outward flange 338 and engraved. To do.

According to the third invention, since the bolt which is the mounting member 327 is screwed into the female screw of the outward flange 338 through the pressing member 328 and the sound deadening material 308, the number of the sound deadening material 308 to be laminated is increased. In order to adjust the change of the bolt, it is only necessary to change the length required by the bolt, and it is certain that almost the entire peripheral surface 324 of the sound deadening material 308 is open to the atmosphere, and the configuration is simplified. be able to.

Appendix 3 The invention is characterized in that a gap exists between the inner peripheral surface of the insertion hole 310 of the sound deadening material 308 and the outer peripheral surface of the tubular portion 340 of the nozzle member 339.

According to the third invention, since fine foreign matter is stored and stored in the gap, when the fire extinguishing gas is injected from the nozzle hole 304, the clogging of the nozzle hole 304 by the foreign matter is prevented and the eyes of the foreign matter are prevented. It is possible to prevent the generation of noise and the decrease in flow rate due to clogging. Foreign matter is present in the conduit 314, for example welded scales and slags in the conduit 314, when the conduit 314 is a plated tube, strips of the plated layer in the plated tube, rust, and sealing material used in fittings. Such as fragments of.

Appendix 3 The invention is characterized in that the inner peripheral surface of the insertion hole 310 of the sound deadening material 308 and the outer peripheral surface of the tubular portion 340 of the nozzle member 339 are in close contact with each other.

According to the third invention, the sound deadening effect is improved by the inner peripheral surface of the insertion hole 310 of the sound deadening material 308 and the outlet end face of the nozzle hole 304 formed in the tubular portion 340 of the nozzle member 339 in close contact with each other. This was confirmed by the present inventor, as will be described later in connection with FIGS. 20 and 21.

(Appendix 3 Effect of Invention)
According to the third invention, since the injection head 300 is provided with the muffling means 302, even if a high-pressure fire extinguishing gas is injected from the nozzle member 339 of the injection head 300 at the time of a fire, a loud injection noise is generated and the flow rate is reduced. Can be prevented.

Further, according to the invention of Appendix 3, since the peripheral surface 324 of the sound deadening material 308 is open to the atmosphere, the injection of the fire extinguishing gas is not hindered by obstacles or the like, and therefore a large injection is made due to the miniaturized configuration. It is possible to prevent the generation of sound.

Each of the plurality of sound deadening materials 308 is made of a porous material through which gas can flow, is formed in a flat plate shape, and is laminated and assembled. Therefore, by selecting the number of layers according to the flow rate, pressure, and degree of muffling of the fire extinguishing gas injected into the space in the fire extinguishing target section, the desired characteristics of various injections and muffling can be accurately obtained. It is easy to adjust and obtain. Further, the sound deadening material 308 having the same size and shape may be manufactured, and mass production is easy and productivity is improved.

(Appendix 4 Invention)
Appendix 4 The invention is
(A) An injection head 400 having a nozzle hole 404 that injects a high-pressure fire extinguishing gas toward a space in a fire extinguishing target section in a building.
(B) A conduit 14 having an end portion 14a to which the injection head 400 is connected and guiding a high-pressure fire extinguishing gas to the injection head 400.
(C) A fire extinguishing gas supply source 15 that supplies a high-pressure fire extinguishing gas to the conduit 14 and
(D) A gas fire extinguishing device provided in the injection head 400 and including a sound extinguishing means 402 for attenuating sound due to emission of fire extinguishing gas from a nozzle hole 404.
(E) The injection head 400
(E1) An injection head main body 401 connected to the end 14a of the conduit 14 and
(E2) Nozzle member 409
(E2-1) A tubular portion 440 extending along the axis of the end portion 14a of the conduit 14 and having one end in the axial direction connected to the injection head main body 401.
(E2-2) A nozzle member 409 having a nozzle hole 404 connected to the other end in the axial direction of the tubular portion 440 and having an end wall 441 for closing the other end in the axial direction of the tubular portion 440 is provided. f) The muffling means 402
(F1) The sound deadening material 408, which is formed in a flat plate shape and is made of a porous material through which gas can flow, and a plurality of sheets are laminated, and the end face 420 on one side of the laminated sound deadening material 408 in the axial direction. Is a sound deadening material 408 arranged facing the injection head main body 401, and
(F2) A pressing member 428 that presses the end surface 425 on the other side in the axial direction of the laminated sound deadening material 408, and a pressing member 428.
(F3) A mounting member 427 that sandwiches and fixes the sound deadening material 408 between the injection head main body 401 and the pressing member 428, and
(F4) A guide member having an annular mounting portion 422 arranged facing the injection head main body 401 and a short tubular guide portion 423 connected to the mounting portion 422 and covering the peripheral surface 424 of the laminated sound deadening material. It is a gas fire extinguishing apparatus including 421.

According to the invention of Appendix 4, the high-pressure fire extinguishing gas supplied from the fire extinguishing gas supply source 15 to the conduit 14 is injected toward the space in the building through the injection head 400. Such an injection head 400 is provided with a muffling means 402, and it is possible to prevent the generation of a large injection noise due to the injection flow of the fire extinguishing gas injected from the nozzle hole 404 of the injection head 400 at a high speed.

The guide member 421 has a mounting portion 422 and a short tubular guide portion 423 that is connected to the mounting portion 422 and guides the fire extinguishing gas. The other end surface 425 of the sound deadening material 408 is open to the atmosphere except for a portion in contact with the pressing member 428. The peripheral surface 424 of the sound deadening material 408 is surrounded by the guide portion 423 of the guide member 421. Therefore, the fire extinguishing gas flows from the conduit 14 through the nozzle hole 404 of the injection head 400 and the nozzle member 409 into the sound deadening material 408, passes through the fine voids of the sound deadening material 408, expands under reduced pressure, and expands with reduced pressure. In a state where the emission from the peripheral surface 424 is suppressed by the guide portion 423, the fire extinguishing gas can reach a long distance without producing a loud sound by being injected into the space in the fire extinguishing target section in the building.

Regarding the large acoustic reduction effect due to the small structure, the high-pressure fire extinguishing gas injected through the nozzle hole 404 at the time of extinguishing the fire is decompressed and expanded by passing through the fine voids of the sound deadening material 408, and thus the fire extinguishing gas The pressure is gradually and smoothly decompressed and expanded without reducing the flow rate, and the generation of sound is effectively suppressed. Since it is not necessary to provide a large sound attenuation space for attenuating sound in this way, it is possible to achieve a large sound reduction effect while reducing the size of the configuration.

The plurality of sound deadening materials 408 are made of a porous material through which gas can flow, are formed in a flat plate shape, and are laminated and assembled. Therefore, by selecting the number of layers according to the flow rate, pressure, and degree of muffling of the fire extinguishing gas injected into the space in the fire extinguishing target section, the desired characteristics of various injections and muffling can be accurately obtained. It is easy to adjust and obtain. Further, the sound deadening material 408 having the same size and shape may be manufactured, and mass production is easy and productivity is improved.

Appendix 4 The invention is characterized in that a gap 415 exists between the end face of the sound deadening material 408 on the side facing the nozzle hole 404 and the end face of the nozzle member 409 facing the sound deadening material 408.

According to Appendix 4, according to the invention, a gap 415 is provided between the end surface of the sound deadening material 408 on the side facing the nozzle hole 404 and the end surface of the nozzle member 409 facing the sound deadening material 408, so that foreign matter can enter the gap 415. When the fire extinguishing gas is injected from the nozzle hole 404, the sound deadening material 408 is prevented from being clogged by foreign matter, and noise is prevented from being clogged by foreign matter and a decrease in flow rate is prevented. Foreign matter is present in the conduit 14, for example, scales and slags from welding in the conduit 14, and when the conduit 14 is a plated tube, stripped pieces of the plated layer in the plated tube, rust, and sealing material used in fittings. Such as fragments of.

Appendix 4 The invention is characterized in that the guide member 421 further includes an annular expanding portion 443 that is continuous with the other end side of the guide portion 423 in the axial direction and expands in a truncated cone shape.

According to the invention of Appendix 4, since the guide member 421 has the expansion portion 443, the fire extinguishing gas released from the end face on the other side in the axial direction of the sound deadening material 408 is discharged outward in the radial direction with respect to the axis of the injection head immediately after the release. Diffusion is suppressed, the fire extinguishing gas can reach a long distance, and the required amount of fire extinguishing gas can be released within the fire extinguishing target section.

(Appendix 4 Effect of Invention)
According to the invention of Appendix 4, since the injection head 400 is provided with the sound extinguishing means 402, it is possible to prevent a loud injection sound from being generated even if a high pressure fire extinguishing gas is injected from the injection head 400 at the time of a fire. .. Further, the plurality of sound deadening materials 408 are made of a porous material through which gas can flow, are formed in a flat plate shape, and are laminated and assembled. Therefore, by selecting the number of layers according to the flow rate, pressure, and degree of muffling of the fire extinguishing gas injected into the space in the fire extinguishing target section, the desired characteristics of various injections and muffling can be accurately obtained. It is easy to adjust and obtain. Further, the sound deadening material 408 having the same size and shape may be manufactured, and mass production is easy and productivity is improved.

Further, according to the invention of Appendix 4, a gap 415 is provided between the end surface of the sound deadening material 408 on the side facing the nozzle hole 404 and the end surface of the injection head 400 on the side facing the sound deadening material 408, so that a fine foreign matter is formed. Is stored and stored in the gap 415, and when the fire extinguishing gas is injected from the nozzle hole 404, the sound deadening material 408 is prevented from being clogged by foreign matter, noise is prevented from being clogged by foreign matter, and the fire is extinguished. It is possible to prevent a decrease in the flow rate due to clogging during gas injection.

According to the invention of Appendix 4, since the guide member 421 has the expansion portion 443, the fire extinguishing gas released from the end face on the other side in the axial direction of the sound deadening material 408 is discharged outward in the radial direction with respect to the axis of the injection head immediately after the release. Diffusion is suppressed, the fire extinguishing gas can reach a long distance, and the required amount of fire extinguishing gas can be released within the fire extinguishing target section.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

14 conduits, 15 fire extinguishing gas supply sources, 18 branch pipes, 19 branch pipes, 20 bases, 21 brackets, 22 fasteners, 23 main pipes, 100 injection heads, 101 injection head bodies, 102 muffling means, 103 mounting auxiliary members, 104 Nozzle hole, 105 base, 106 outward flange, 108 second sound deadening material, 109 rectifying member, 110 screw, 111 fire extinguishing gas injection part, 112 rectifying hole, 113 first sound deadening material, 114 annular member, 121 guide member, 122 mounting Part, 123 guide part, 124 peripheral surface, 128 holding member, 131
Mounting seat, 137 base, 138 engaging, 200 injection head, 201 injection head body, 202 muffling means, 204 nozzle hole, 205 base, 206 outward flange, 208 muffling material, 221 guide member, 222 mounting part, 223 guide part , 224 peripheral surface, 400 injection head, 401 injection head body, 402 muffling means, 403 mounting auxiliary member, 404 nozzle hole, 405 base, 406 outward flange, 407,410 screw, 408 muffling material, 409 nozzle member, 415 gap , 420 End face, 421 guide member, 422 mounting part, 423 guide part, 424 peripheral surface, 425 end face, 427 mounting member, 428 holding member, 431 mounting seat, 432 end face, 443 expansion part.

Claims (8)

A fire extinguishing gas injection device that injects high-pressure fire extinguishing gas toward the space in the fire extinguishing target section of the building.
The fire extinguishing gas injection device has an injection head and a sound deadening means for attenuating the sound due to the emission of the fire extinguishing gas from the injection head.
The muffling means includes a first muffling member provided on the injection head side and a second muffling member provided on the downstream side of the first muffling member.
A fire extinguishing gas injection device in which each of the first and second sound deadening members is formed in a flat plate shape and is made of a porous material through which gas can flow. The fire extinguishing gas injection device according to claim 1, wherein the first and second sound deadening members are laminated to form a cylindrical shape or a cylindrical shape. The fire extinguishing gas injection device according to claim 1 or 2, wherein the first and second sound deadening members have the same outer diameter. The fire extinguishing gas injection device according to any one of claims 1 to 3, wherein the first and second sound deadening members have the same thickness. The fire extinguishing gas injection device according to any one of claims 1 to 4, wherein the entire outer peripheral surface of the first and second sound deadening members is exposed to the atmosphere. The fire extinguishing gas injection device according to any one of claims 1 to 5, further comprising an annular or plate-shaped pressing member for fixing the second sound deadening member. The muffling means has a first muffling means located on the upstream side and a second muffling means located on the downstream side, and gas can flow between the first muffling means and the second muffling means. The fire extinguishing gas injection device according to any one of claims 1 to 6, wherein the intermediate member is arranged. The fire extinguishing gas injection device according to any one of claims 1 to 7, a conduit for guiding a high pressure fire extinguishing gas to the fire extinguishing gas injection device, and a fire extinguishing gas supply source for supplying a high pressure fire extinguishing gas to the conduit. Equipped with a gas fire extinguishing device.

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