JP6535768B2 - Fire-extinguishing gas injection system, gas fire-extinguishing system equipped with the same, and installation method of fire-extinguishing gas injection system - Google Patents

Description

The present invention relates to a fire extinguishing gas injection device for extinguishing fire by releasing a fire extinguishing gas such as N ₂ gas or a halide gas as a extinguishing agent into a space in a fire extinguishing target section of a building when a fire occurs, and a gas extinguishing apparatus equipped with the same. More specifically, the present invention relates to a fire extinguishing gas injection device that can be suitably implemented to reduce a large sound generated when fire extinguishing gas is injected from an injection head provided in a fire suppression target section, and a gas extinguishing device equipped with the same. .

Conventionally, various buildings are equipped with a gas extinguishing device that releases a extinguishing gas such as CO ₂ gas and N ₂ gas and a halide gas as a extinguishing agent into a space in the extinguishing target compartment to extinguish the fire.

  FIG. 31 is a perspective view showing a part of the configuration including the injection head 3 of the conventional gas extinguishing system. The high pressure fire extinguishing gas supplied from the fire extinguishing gas supply source 2 at the time of fire occurrence is led to the conduit 4 and is jetted from the injection head 3 connected to the conduit 4.

  In the conduit 4, the main pipe 5 connected to the extinguishing gas supply source 2, the branch pipe 6 interposed in the main pipe 5, and the branch pipe 6 lead the extinguishing gas from the main pipe 5, and the injection head 3 is connected And a branch pipe 7. The main pipe 5 is fastened to the base 8 and the bracket 9 fixed to the frame of the building or the frame by a fastener 10 such as a U-bolt, and installed with the vibration and displacement of the jet head 3 suppressed ( For example, refer to Patent Document 1).

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

  In another prior art for solving this problem (see, for example, Patent Document 2), the outlet portion of the orifice for injecting the extinguishing gas is provided with a sound deadening means composed of a sound deadening material made of a porous material. Is formed integrally with the orifice and extending in the axial direction of the orifice, or formed of two stacked divided structures extending in the axial direction of the orifice and formed respectively in a thick manner.

  The new problem of this prior art is that the characteristics of various types of injection and muffling are accurately adjusted according to the flow rate of the extinguishing gas to be injected into the space in the target area for fire extinguishing, pressure and the degree to which muffling is required. It is difficult to get it adjusted.

JP-A-8-173565 Patent No. 5276728 gazette

  An object of the present invention is to provide an extinguishing gas injection device capable of attenuating the sound resulting from the squirting flow of extinguishing gas from the jet head and being easy to obtain by accurately adjusting various injection and muffling characteristics It is providing a gas fire extinguisher equipped with it.

  A fire extinguishing gas injection device for injecting a high pressure fire extinguishing gas toward a space in a fire extinguishing target section in a building, wherein the fire extinguishing gas injection device comprises an injection head and sound due to the discharge of fire extinguishing gas from the injection head. The damping means has a damping means for damping, and the damping means has a first silencing member provided on the side of the jet head and a second silencing member provided on the downstream side of the first silencing member. Each of the first and second sound deadening members is formed in a flat plate shape and made of a porous material through which gas can flow.

  In the fire extinguishing gas injection device configured as described above, it is possible to appropriately change the characteristics of the injection and the muffling by changing the number of laminated sheets, as compared with the case where the muffling material is constituted by the cylindrical block.

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

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

Preferably, the entire outer peripheral surface of the first and second noise reduction members is exposed to the atmosphere.
Preferably, it further comprises an annular or plate-like pressing member for fixing the second muffling member.

  Preferably, the muffling means has a first muffling means located upstream and a second muffling means located downstream, and a gas is interposed between the first muffling means and the second muffling means An intermediate member through which fluid can flow is disposed.

  The gas extinguishing system comprises any of the above-described extinguishing gas injection devices, a conduit for guiding extinguishing gas of high pressure to the extinguishing gas injection device, and an extinguishing gas supply source of supplying extinguishing gas of high pressure to the conduit. .

It is a perspective view which shows the structure of one part containing the injection head 100 and the noise reduction means 102 of the gas fire extinguishing apparatus of one Embodiment of this invention. FIG. 2 is a perspective view showing the ejection head 100 and the muffling means 102 of FIG. 1; It is sectional drawing which shows the injection | spray head 100 of FIG. 1, and the muffling means 102. As shown in FIG. FIG. 10 is a partial enlarged cross-sectional view showing a state in which the guide member 121 is sandwiched by the attachment assisting member 103 and the second silencing member 108. It is sectional drawing which shows the injection | spray head 700 in which experiment was done by this inventor, and the muffling means 701, 701a. It is a figure which shows time progress of the sound pressure level obtained when this inventor discharged | extinguished fire-extinguishing gas by the structure of FIG. It is sectional drawing which shows the injection head 500 and the muffling means 502, 502a in which experiment was done by this inventor. It is a figure which shows time progress of the sound pressure level obtained when this inventor discharged | extinguished fire-extinguishing gas by the structure of FIG. It is sectional drawing which shows the gas fire extinguishing apparatus of other embodiment of this invention. It is a perspective view which shows the structure of one part containing the injection head 200 and the muffling means 202 of the gas fire extinguishing apparatus of one Embodiment of this invention. It is a perspective view which shows the injection | spray head 200 of FIG. 10, and the muffling means 202. As shown in FIG. FIG. 11 is a cross-sectional view showing the ejection head 200 and the muffling means 202 of FIG. 10; FIG. 7 is a partial enlarged cross-sectional view showing a state in which the guide member 221 is sandwiched by the jet head body 201 and the noise reduction material 208. It is sectional drawing which shows the injection head 500 and the muffling means 502, 502a in which experiment was done by this inventor. It is a figure which shows time progress of the sound pressure level obtained when this inventor discharged | extinguished fire-extinguishing gas by the structure of FIG. It is sectional drawing which shows the gas fire extinguishing apparatus of other embodiment of this invention. It is a perspective view which shows the structure of one part containing the injection head 300 and the noise reduction means 302 of the gas fire extinguishing apparatus of one Embodiment of this invention. FIG. 18 is a perspective view showing the ejection head 300 and the muffling means 302 of FIG. 17; FIG. 18 is a cross-sectional view showing the ejection head 300 and the muffling means 302 of FIG. 17; It is sectional drawing which shows the injection | spray nozzle 500 and the muffling means 502, 502a in which experiment was done by this inventor. It is a figure which shows time progress of the sound pressure level obtained when this inventor discharged | extinguished fire-extinguishing gas by the structure of FIG. It is a perspective view which shows the structure of one part containing the injection head 400 and the noise reduction means 402 of the gas fire extinguishing apparatus of one Embodiment of this invention. FIG. 23 is a perspective view showing the ejection head 400 of FIG. 22 and the noise reduction means 402. FIG. 23 is a cross-sectional view showing the ejection head 400 and the muffling means 402 of FIG. 22. FIG. 16 is a partial enlarged cross-sectional view showing a state in which the guide member 421 is sandwiched between the attachment assisting member 403 and the sound deadening material 408. It is sectional drawing which shows the injection | spray head 700 in which experiment was done by this inventor, and the muffling means 701, 701a. It is a figure which shows time progress of the sound pressure level obtained when this inventor discharged | extinguished fire-extinguishing gas by the structure of FIG. It is sectional drawing which shows the injection head 500 and the muffling means 502, 502a in which experiment was done by this inventor. It is a figure which shows time progress of the sound pressure level obtained when this inventor discharged | extinguished fire-extinguishing gas by the structure of FIG. It is sectional drawing which shows the gas fire extinguishing apparatus of other embodiment of this invention. It is a perspective view which shows the structure of one part containing the injection head 3 of the gas fire extinguishing apparatus of a prior art.

  FIG. 1 is a perspective view showing a part of the configuration including the injection head 100 and the muffling means 102 of the gas extinguishing system according to one embodiment of the present invention. The gas extinguishing apparatus of the present embodiment is provided in the fire extinguishing section of a building, and is connected to the jet head 100 that jets high pressure extinguishing gas toward the space in the fire extinguishing target section, and the jet head 100 is connected. Injection from the conduit 14 leading high pressure fire extinguishing gas to 100, the extinguishing gas supply source 15 for supplying high pressure fire extinguishing gas to the conduit 14, and the nozzle hole 104 formed in the injection head 100 (see FIG. 3 described later) And muffling means 102 for attenuating the sound generated due to the extinguishing gas injection.

The extinguishing gas is realized by noncombustible gas such as N ₂ gas, CO ₂ gas and halide gas. Such fire extinguishing gas is sufficiently diffused even in a large fire extinguishing area where the extinguishing gas reach distance is 15 m or more, for example, and the space in the fire extinguishing area reaches the predetermined extinguishant concentration uniformly in a short time. You can let it go and extinguish it.

  The extinguishing gas injection unit 111 is configured by the injection head 100 and the muffling means 102. In such a extinguishing gas injection unit 111, the extinguishing gas is supplied from the extinguishing gas supply source 15 to the injection head 100 through the conduit 14. The conduit 14 includes a main pipe 23 connected to the extinguishing gas supply source 15, a branch pipe 18 interposed in the main pipe 23, and a branch pipe 19 connected to the branch pipe 18, and the fire extinguishing via such a pipe 14 The high pressure extinguishing gas from the gas supply source 15 is led to the injection head 100. The conduit 14 is fastened to the base 20 and the bracket 21 by a fastener 22 such as a U-bolt, and is installed in the housing of the building in a state in which vibration and displacement are suppressed.

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

  The mounting support member 103 has a base 105 and an outward facing flange 106 connected to the base 105. The base 105 is removably attached to the jet head body 101 by means of screws 107.

  The muffling means 102 is composed of first and second muffling materials 113 and 108 made of porous material through which gas can flow. The second silencer material 108 has a large diameter, and the first silencer material 113 has a diameter smaller than that of the second silencer material 108. The first and second silencer materials 113 and 108 have a plurality of members each having a thin disk shape and a thin annular shape, and these members are laminated. The overall shapes of the first and second noise-reduction members 113 and 108 are substantially cylindrical.

  The flow straightening member 109 is attached to the attachment assisting member 103 by a screw 110. The straightening member 109 has a straightening hole 112 which is a choke. In the flow control member 109, the above-mentioned first silencing material 113 made of a porous material through which gas can flow is accommodated. Each of the plurality of members has a thin disk shape, and the first silencer material 113 is formed by laminating these members. The straightening holes 112 do not have the function of restricting the flow rate of the extinguishing gas, but function to disperse and rectify the extinguishing gas decelerated and reduced in pressure by the first silencer material 113 and guide the extinguishing gas to the next second silencer material 108 . An annular member 114 is interposed between the end face of the outward flange 106 of the mounting assisting member 103 and the first noise absorbing member 113. The annular member 114 forms a gap 115 between the jet head main body 101 and the first silencer material 113 for holding the foreign matter such as fine rust from the nozzle hole 104 and storing the same, whereby foreign matter from the nozzle hole 104 is caused by the foreign matter. Prevent clogging.

  FIG. 4 is a partial enlarged cross-sectional view showing a state in which the guide member 121 is sandwiched by the attachment assisting member 103 and the second silencing member 108. As shown in FIG. The end face 120 of one side (left of FIGS. 2 and 3) of the second noise absorbing material 108 is disposed in contact with the annular attachment portion 122 of the guide member 121 and facing the outward facing flange 106 of the attachment assisting member 103. Be done. The guide member 121 has the attachment portion 122 and a short cylindrical guide portion 123 which is connected to the attachment portion 122 and guides the extinguishing gas.

  The peripheral surface 124 of the second silencing material 108 and the end surface 125 on the other side (right side in FIGS. 2 and 3) fix the second silencing material 108 to the outward flange 106 of the mounting assisting member 103 via the attaching member 127. It is open | released to air | atmosphere except the part which touches the holding member 128 as a ring member. The shaft portion of the mounting member 127 is screwed to the outward facing flange 106 of the mounting support member 103 through the pressing member 128 (ring member, annular member), the second silencing member 108, and the mounting portion 122 of the guide member 121. Ru.

  The mounting portion 122 of the guide member 121 is fitted in a mounting seat 131 formed in an annular recess on the outward facing flange 106 of the mounting support member 103, as shown in FIG. It bulges from the end face 132 (downward in FIG. 4) by a gap ΔL1.

  Referring back to FIG. 3, in the jet head 100, the jet head body 101 has a base portion 137 and a hook portion 138 connected to the base portion 137. The base portion 137 of the jet head 100 is detachably connected to the end 14 a of the conduit 14 by a first screw 112 which is a tapered screw.

The mounting assisting member 103 is provided on the base 137 of the jet head body 101 so as to be removable and replaceable. Various ejection head bodies 101 having different bore diameters of the nozzle holes 104 are individually selected and used depending on the length of the conduit 14 and the like. Describe the reason. The gas extinguishing system will quickly fill the space in the extinguishing area with extinguishing gas while securing a large flow rate (for example, 20,000 to 100,000 liters / minute) necessary for extinguishing which is the original function of the gas extinguishing system. It must be configured to be able to release the extinguishing gas, ensuring a high flow rate (eg 100 m / s). Therefore, the Fire Service Law stipulates that the radiation pressure of the extinguishing gas from the nozzle hole 104 of the injection head 100 in the gas extinguishing system is 1.9 MPa or more, and in practice, 2 to 3 MPa (≒ 20 to 30 kgf / It is carried out at a high radiation pressure of cm ² and still higher up to about 6 MPa ≒ 60 kgf / cm ² ).

  Therefore, the value of the bore diameter of the nozzle hole 104 of the injection head 100 is determined by the injection head 15 from the extinguishing gas supply source 15 so that the extinguishing gas injected from the nozzle hole 104 achieves the high flow rate, high flow velocity and high radiation pressure described above. Depending on the length of the conduit 14 up to the installation location of 100, etc. and thus the conduit resistance, it has to be set.

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

  The noise reduction means 102 has a first noise reduction material 113, a second noise reduction material 108, a pressing member 128 and an attachment member 127. The first and second silencers 113 and 108 are made of a porous material through which a gas can flow, for example, a porous metal in which fine metal powder or fine metal wire or the like is sintered, and a second silencer The fine air gap of the material 108 is smaller than the air gap of the first silencer material 113, and a high pressure fire extinguishing gas can be effectively silenced without reducing the flow rate by the smooth and slow decompression expansion. The first silencer material 113 and the second silencer material 108 depend on the flow conditions of the extinguishing gas such as the diameters and lengths of the nozzle holes 104 and the straightening holes 112, the number of the nozzle holes 104 straightening holes 112, and the formation position. Thus, porous materials having different densities may be selected and used. In addition, as the first and second silencing members 113 and 108, for example, a plurality of layers of wire mesh may be laminated, or a plate-like formed product or a porous member made of synthetic resin fibers may be used.

  The first and second silencers 113 and 108 are formed, for example, in a flat plate shape such as a disk, and the second silencer 108 has a diameter larger than that of the first silencer 113, and a plurality of sheets are stacked. . Each of the overall shapes of the stacked first and second silencers 113 and 108 is, for example, a cylindrical shape. The end face 120 of one axial direction side (left side in FIG. 3) of the stacked second silencing material 108 faces the right side of FIG. 3 in the hooking portion 138 where a tool such as a spanner of the jet head body 101 is hooked. For example, the circumferential surface 124 of the second silencer material 108 disposed and stacked in contact with the outside is opened to the atmosphere.

  The pressing member 128 presses the end surface 125 of the other side (right side in FIG. 3) of the stacked second silencing members 108. The pressing member 128 has a flat plate shape, and has a circumferential surface 124 extending along the circumferential surface 124 of the second silencer material 108.

  The mounting member 127 in this embodiment is a bolt as a screw member and is indicated using the same reference numerals. A plurality of (for example, 6) mounting members 127 are arranged at equal intervals around the axis L103. The shaft portion of the mounting member 127 passes through the bolt insertion holes respectively formed in the pressing member 128 and the second silencing member 108, and the head of the mounting member 127 is opposite to the second silencing member 108 of the pressing member 128. Lock on the side (right side in Figure 3). An external thread formed on the shaft portion of the mounting member 127 is pierced in the engagement portion 138 so as to be releasably screwed on the screw. By this, the mounting member 127 clamps and fixes the stacked second silencer material 108 between the hooking 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 14 a of the conduit 14, the jet head 100 and the muffling means 102 are in a straight line. The workability of connecting the base portion 137 of the jet head main body 101 by the first screw 112 to the end portion 14a of the conduit 14 in the state where the noise reduction means 102 is attached to the jet head 100 is good.

  The axis L103 of the end 14a of the conduit 14 is such that the axes of the jet head 100 including the jet head body 101, the second silencing member 108, and the pressing member 128 are on one straight line. Therefore, the workability of the connection by the first screw 112 of the end 14a of the conduit 14 and the base 137 of the ejection head main body 101 and the connection by the second screw 107 of the base 137 of the ejection head main body 101 and the rectifying member 109 is It is good. The fact that the connection workability is good means that in many cases the jet head 100 and the noise reduction means 102 have a ceiling higher than a person who is not an obstacle to the movement of a person or the like in a fire extinguishing section in a building. It is important in view of being connected to a place such as

  At the time of fire extinguishing, the high pressure fire extinguishing gas injected through the nozzle hole 104 passes through the fine air gap of the second silencer 108 gradually, smoothly, smoothly, and decompressed and expanded to generate sound. Reduced and suppressed, and injected into the space in The fire extinguishing gas from the circumferential surface 124 of the first silencer material 108 can be horizontally and radially injected near the ceiling and can be diffused uniformly and rapidly throughout the space in the fire suppression target section. Therefore, it is possible to achieve rapid extinguishment of the fire extinguishing area.

  The second silencer 108 makes it possible to reduce the size and at the same time dampen the sound resulting from the jet flow of the extinguishing gas from the jet head, thereby accurately adjusting the characteristics of the jet and the muffling to reduce the extinguishing gas flow rate. A large sound reduction effect can be achieved without

  In the above-described embodiment, the silencer 102 having a complicated configuration as compared with the jet head 100 can be attached to and detached from the various jet heads 100 having different diameters of the nozzle holes 104 by the attachment member 127. The second silencing members 113 and 108 can be commonly used for the various ejection heads 100. This common use facilitates the mass production of the first and second silencers 113 and 108, and improves the productivity.

  In addition, depending on the necessity of muffling in the fire extinguishing section, individual selective use is easily possible, and by removing the fire extinguishing target section without the need for muffling, it is possible to Simplification can be achieved. Furthermore, the muffling means 102 removed from the extinguishing target section where the need for muffling has been eliminated can be attached to another extinguishing target section to be muted and reused, thereby providing good economy and saving energy. Can be achieved.

  In another embodiment of the present invention, the jet head 100 and the silencing means 102 may be configured integrally, i.e. non-removable. In this embodiment, the base portion 137 of the jet head body 101 is detachably provided at the end 14a of the conduit 14 by the first screw 112, and various jet heads 100 having different diameters of the nozzle holes 104 are individually It may be selected and used.

  Also, the jet head 100 and the noise reduction means 102 are connected in advance by the second screw 107 and the mounting member 127 into an assembly, and then the base 137 of the jet head body 101 in this assembly is the end of the conduit 14 The workability of connecting to the portion 14 a by the first screw 112 is also good.

  Furthermore, engagement of the jet head body 101 is performed in order to make the existing fire extinguishing target section in which the base portion 137 of the jet head main body 101 is connected to the end 14 a of the conduit 14 by the first screw 112. When the noise reduction means 102 is connected to the portion 138 by the second screw 107, the workability of the connection is also good.

  A gap 115 exists between the end face of the first silencing material 113 facing the nozzle hole 104 and the end face of the ejection head main body 101 facing the first silencing material 113. When the extinguishing gas is injected from the nozzle hole 104, fine foreign matter is stored in the gap and stored, so clogging of the nozzle hole 104 with foreign matter can be prevented and noise due to clogging of foreign matter It is possible to prevent a drop in flow rate at the time of generation and release.

  Foreign matter is present in the conduit 14 and, for example, welded scale and slag in the conduit 14, when the conduit is a plated pipe, peeling pieces of the plated layer in the plated pipe, rust, and the seal material used in the pipe joint It is a fragment etc. Further, due to the pressure reduction inside the injection head 100 and the discharge of the extinguishing gas outward in the radial direction, the injection reaction force acting in the backward direction (leftward in FIG. 3) from the injection head 100 to the conduit 14 at the extinguishment gas injection is It can be reduced to about 1/9 of the prior art shown in FIG.

  In another embodiment of the present invention, an ejection head 700 in which the end face of the first silencer 113 in the above-described embodiment disposed on the side of the nozzle hole 104 and the ejection head body 101 and the attachment assisting member 103 are integrated. The inventors of the present invention have confirmed that the muffling effect does not decrease even when the end face of the first muffling material 113 is disposed apart from the first muffling material 113. The experiments and their results are described below with reference to FIGS. 5 and 6.

FIG. 5 is a cross-sectional view showing the jet head 700 and the muffling means 701 and 701a for which experiments were conducted by the present inventor, and FIG. 6 is obtained when the present inventor releases the extinguishing gas by the configuration of FIG. It is a figure which shows the time progress of the sound pressure level made. In FIG. 5 (1), the extinguishing gas which is the N ₂ gas from the conduit 714 is jetted from the nozzle hole 704 of the jet head 700.

  In the flow straightening member 703 attached to the jet head 700, the four first silencing members 705 are stacked and stored. Further, three second silencing members 706 are stacked and disposed on the downstream side (right side in FIG. 5) of the flow direction of the extinguishing gas of the flow control member 703. The extinguishing gas that has passed through the first silencer material 705 passes through the straightening holes 707 of the rectifying member 703, is rectified, flows into the second silencer material 708, and is radially outward from the circumferential surface 709 of the second silencer material 708. As well as being discharged into the space to be extinguished from the discharge hole 752 of the holding member 728. The first silencing material 705 comes in close contact with the flat end face of the outlet end of the nozzle hole 704 of the jet head 500.

The supply pressure of the extinguishing gas supplied from the conduit 714 to the jet head 700 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is about 55 m ³ / min, and the flow rate of the extinguishing gas discharged from the nozzle hole 504 Is about 60 to 100 m / sec. The void ratio of the space 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 / piece, the thickness of the second sound deadening material 708 is 10 mm / It is a sheet.

  In FIG. 5 (2), the first silencing material 705 of the silencing means 701 a is disposed with a gap 753 of about 1 mm from the flat end face of the outlet end of the nozzle hole 704 of the jet head 700. The same as 5 (1).

  FIG. 6 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention released the extinguishing gas according to the configuration of FIG. The line 754 is an experimental result by the configuration in which the first silencer material 705 is in close contact with the flat end face of the outlet end of the nozzle hole 704 as shown in FIG. 5 (1). The first silencer material 705 is arranged by leaving the gap 753 from the flat end face of the outlet end of the nozzle hole 704 as shown in FIG.

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

  By providing such a gap 753 between the end face of the first silencing member 705 facing the nozzle hole 704 and the end face of the jet head 700 facing the first silencing member 705, the silencing effect is not reduced. When a minute foreign matter is stored and stored in the gap 753 and fire extinguishing gas is injected from the nozzle hole 704, clogging of the first and second silencers 705, 706 due to the foreign matter is prevented and the eyes of the foreign matter Noise generation due to clogging can be prevented. Foreign matter is present in the conduit 14 and, for example, welded scale and slag in the conduit 14, when the conduit 14 is a plated pipe, peeling pieces of the plated layer in the plated pipe, rust, and a sealing material used in the pipe joint And so on.

FIG. 7 is a cross-sectional view showing the jet head 500 and the muffling means 502 and 502a for which experiments were conducted by the present inventor. In FIG. 7 (1), the extinguishing gas which is the N ₂ gas from the conduit 514 is jetted from the nozzle hole 504 of the jet head 500.

  In the straight cylindrical housing 551 of the muffling means 502 attached to the jet head 500, eleven muffling materials 508 are stacked and stored. The extinguishing gas which has passed through the sound deadening material 508 is released from the discharge hole 552 of the housing 551 into the space in the extinguishing target compartment. The silencing material 508 is in close contact with the flat end face of the outlet end of the nozzle hole 504 of the jet head 500.

The supply pressure of the extinguishing gas supplied from the conduit 514 to the jet head 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is about 55 m ³ / min, and the flow rate of the extinguishing gas discharged from the nozzle hole 504 Is about 60 to 100 m / sec. The void ratio of the void 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 muffling material 508 of the muffling means 502 a is disposed with a gap 553 of about 1 mm from the flat end face of the outlet end of the nozzle hole 504 of the jet head 500. It is the same as 1).

  FIG. 8 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention released the extinguishing gas according to the configuration of FIG. Line 554 is an experimental result by the structure which closely_contact | adhered and contacted the muffling material 508 with the flat end surface of the exit end of the nozzle hole 504 like FIG. 7 (1), and the line 555 is FIG. 7 (2). In the experiment, the noise eliminator 508 is arranged with the gap 553 open from the flat end face of the outlet end of the nozzle hole 504.

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

  FIG. 9 is a cross-sectional view showing a gas extinguishing system according to another embodiment of the present invention. The guide member 121 described above is omitted in the noise reduction means 600 of the gas extinguishing system. The function of the guide member 121 will be described with reference to FIG.

  The extinguishing gas from the plurality of nozzle holes 609 formed uniformly distributed on the entire surface of the flat nozzle portion 608 of the jet head main body 601 is jetted along the mutually parallel axes of the nozzle holes 609, The minute air gaps of the first silencer material 613 and the second silencer material 610 disposed downstream of the nozzle hole 609 gradually pass smoothly, smoothly, and decompressed and expanded. The axes of the jet head main body 601 and the first and second silencing members 613 and 610 are on a straight line. The fine air gaps of the first and second silencers 613, 610 provide pressure loss to the extinguishing gas passing therethrough.

  Fire-extinguishing gas injected into the second silencer material 610 through the second silencer material 613 and the straightening holes 612 of the rectifying member 611 after being injected along the axis of each nozzle hole 609 in the second silencer material 610 Assuming that the path followed by is straight for simplification, the path length from each flow straightening hole 612 to the most downstream end face of the second silencer material 610 whose overall shape is substantially right cylindrical is shown in FIG. At 9, it is indicated by the reference L601.

  The path length from the side of the flow straightening member 611 to the circumferential surface 614 of the second silencing member 610 is indicated by reference numeral L602 in FIG. In order to increase the flow rate of the extinguishing gas injected from the flow straightening hole 612, L601> L602 when the outer diameter of the flow straightening member 611 is relatively large compared to the length in the axial direction of the second silencer material 610.

  The pressure loss acting on the extinguishing gas is proportional to these path lengths L601 and L602, and therefore the distribution of pressure loss in the second silencer 610 is as indicated by the isobar line 603 connecting the positions producing equal pressure loss. . The pressure loss is the largest in the area on the axis of the second silencer material 610 and becomes smaller as it becomes the peripheral area away from the axis. Since the extinguishing gas injected from the flow straightening hole 612 tends to flow into the area where the pressure loss is small, the extinguishing gas in the second silencer material 610 is indicated by an imaginary line reference 604 in the axial direction of the injection head body 601. As shown, it also travels laterally as indicated by reference 605 and also in the backward direction as indicated by reference 606. The lengths of the reference marks 604, 605, 606 are indicated corresponding to the flow rate of the extinguishing gas, and a relatively large flow of extinguishing gas flows in the lateral and back directions. In order to fill the fire extinguishing gas quickly into the fire extinguishing target section, the second silencing material installed near the wall surface (left side in FIG. 9) among the plurality of second silencing materials 610 extends in the axial direction of the ejection head main body 601. Of the extinguishing gas that injects as much flow as possible in the direction indicated by reference 604 in the phantom line and in the direction indicated by reference 605 in the lateral direction, and proceeds in the backward direction as indicated by reference 606 The flow rate must be reduced.

  In each of the embodiments described above with reference to FIGS. 1 to 8 of the present invention, the guide member 121 is a direction behind FIG. 9 among fire extinguishing gasses injected from the silencers 113, 108; 705, 708. The extinguishing gas advancing to 606 is blocked and advanced to the axial direction 604 and the side 605 of the jet head body 101 and the jet head 700. Thus, the fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target area where the fire extinguishing gas reach distance is 15 m or more, for example, and the space in the fire extinguishing target compartment is uniformly dispersed to a predetermined concentration of extinguishing agent in a short time. It can be reached and extinguished.

  The gas fire extinguishing system of the present invention allows the fire extinguishing gas to be sufficiently diffused even in a large scale fire extinguishing target by releasing the extinguishing gas as a extinguishing agent into the space in the fire extinguishing target section of the building at the time of fire occurrence. Can be implemented extensively.

  A fire extinguishing gas injection device for injecting a high pressure fire extinguishing gas toward a space in a fire extinguishing target compartment in a building, wherein the fire extinguishing gas injection device includes a jet head 100 and a discharge of the fire extinguishing gas from the jet head 100 And the noise reduction means 102 includes a second noise reduction member 108 as a first noise reduction member provided on the jet head 100 side, and a downstream side of the first noise reduction member. And the second sound deadening member 108 as a second sound deadening member provided in each of the first and second sound deadening members, each of the first and second sound deadening members being formed in a flat plate shape and made of a porous material through which gas can flow Become. A cylindrical shape is configured by laminating the first and second sound deadening members. The first and second silencer members have the same outer diameter. The first and second silencer members have the same thickness. The entire outer peripheral surface of the first and second noise reduction members is exposed to the atmosphere. It further includes a pressing member 128 as a ring member for fixing the second noise absorbing member. The muffling means has a first muffling material 113 as a first muffling means located upstream and a second muffling material 108 as a second muffling means located downstream, and the first muffling means A flow straightening member as an intermediate member through which gas can flow is disposed between the second silencing means.

  By forming the muffling member in a flat plate shape, the muffling member is easily bent. As a result, damage to the muffling member can be prevented.

  FIG. 10 is a perspective view showing a part of the configuration including the injection head 200 and the muffling means 202 of the gas extinguishing system of the embodiment of the present invention. The gas extinguishing apparatus of the present embodiment is provided in the fire extinguishing section of a building, and is connected to the jet head 200 that jets high pressure fire extinguishing gas toward the space in the fire extinguishing target section, and the jet head 200 is connected. Sprayed from a conduit 14 for introducing a high pressure fire extinguishing gas to 200, a extinguishing gas supply source 15 for supplying a high pressure fire extinguishing gas to a conduit 14, and a nozzle hole 204 (see FIG. 12 described later) And muffling means 202 for attenuating the sound generated due to the extinguishing gas injection.

The extinguishing gas is realized by noncombustible gas such as N ₂ gas, CO ₂ gas and halide gas. Such fire extinguishing gas is sufficiently diffused even in a large fire extinguishing area where the extinguishing gas reach distance is 15 m or more, for example, and the space in the fire extinguishing area reaches the predetermined extinguishant concentration uniformly in a short time. You can let it go and extinguish it.

  A fire extinguishing gas injection unit 211 is configured by the injection head 200 and the muffling means 202. In such a extinguishing gas injection unit 211, the extinguishing gas is supplied from the extinguishing gas supply source 15 to the injection head 200 through the conduit 14. The conduit 14 includes a main pipe 23 connected to the extinguishing gas supply source 15, a branch pipe 18 interposed in the main pipe 23, and a branch pipe 19 connected to the branch pipe 18, and the fire extinguishing via such a pipe 14 The high pressure extinguishing gas from the gas supply source 15 is led to the injection head 200. The conduit 14 is fastened to the base 20 and the bracket 21 by a fastener 22 such as a U-bolt, and is installed in the housing of the building in a state in which vibration and displacement are suppressed.

  FIG. 11 is a perspective view showing the jet head 200 and the muffling means 202, and FIG. 12 is a cross-sectional view showing the jet head 200 and the muffling means 202. As shown in FIG. The injection head 200 having a muffling function is installed on the wall to release the extinguishing gas to the fire extinguishing section in the gas-based fire extinguishing equipment using the extinguishing gas, and the injection head main body 201 has a muffling means 202 such as a bolt 227 is configured to be detachably attached. In the jet head body 201, a nozzle hole 204 which is a choke is directly formed. The nozzle holes 204 limit the flow rate of the extinguishing gas to a desired value.

  The jet head body 201 has a base 205 and an outward flange 206 connected to the base 205. The base 205 is removably attached to the jet head body 201 by means of screws 207.

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

  FIG. 13 is a partial enlarged cross-sectional view showing a state in which the guide member 221 is sandwiched by the jet head body 201 and the noise reduction material 208. As shown in FIG. An end face 220 of one side (left in FIGS. 12 and 13) of the noise reduction material 208 is disposed in contact with the annular attachment portion 222 of the guide member 221 and facing the outward flange 206 of the jet head body 201. . The guide member 221 has the attachment portion 222 and a short cylindrical guide portion 223 which is continuous with the attachment portion 222 and guides the extinguishing gas.

  A circumferential surface 224 of the noise reduction material 208 and an end surface 225 on the other side (right side in FIG. 12) contact a pressing member 228 fixing the noise reduction material 208 to the outward flange 206 of the jet head main body 201 Except for the atmosphere. The shaft portion of the mounting member 227 is screwed to the outward flange 206 of the jet head main body 201 through the pressing member 228, the noise reduction member 208, and the mounting portion 222 of the guide member 221.

  The mounting portion 222 of the guide member 221 is fitted in a mounting seat 231 formed in an annular recess on the outward flange 206 of the jet head body 201, as shown in FIG. It bulges from the end face 232 (downward in FIG. 13) by a gap ΔL1.

  Referring again to FIG. 12, in the jet head 200, the jet head body 201 has a base 205 and an outward flange 206 connected to the base 205. The base portion 205 of the ejection head 200 is detachably connected to the end 14 a of the conduit 14 by a first screw 212 which is a tapered screw.

The ejection head main body 201 is detachably provided on the base 205 of the ejection head main body 201. Various ejection head bodies 201 having different bore diameters of the nozzle holes 204 are individually selected and used depending on the length of the conduit 14 and the like. Describe the reason. The gas extinguishing system will quickly fill the space in the extinguishing area with extinguishing gas while securing a large flow rate (for example, 20,000 to 100,000 liters / minute) necessary for extinguishing which is the original function of the gas extinguishing system. It must be configured to be able to release the extinguishing gas, ensuring a high flow rate (eg 100 m / s). Therefore, the Fire Service Law stipulates that the radiation pressure of the extinguishing gas from the nozzle hole 204 of the injection head 200 in the gas extinguishing system is 1.9 MPa or more, and in practice, 2 to 3 MPa (≒ 20 to 30 kgf / It is carried out at a high radiation pressure of cm ² and still higher up to about 6 MPa ≒ 60 kgf / cm ² ).

  Therefore, the value of the bore diameter of the nozzle hole 204 of the injection head 200 is determined by the injection head 15 from the extinguishing gas supply source 15 so that the extinguishing gas injected from the nozzle hole 204 achieves the high flow rate, high flow rate and high radiation pressure described above. Depending on the length of the conduit 14 up to the installation site of 200, etc. and thus the conduit resistance, it has to be set.

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

  The noise reduction means 202 has a noise reduction material 208, a pressing member 228 and an attachment member 227. The sound deadening material 208 is made of a porous material through which gas can flow, for example, made of porous metal in which fine metal powder or fine metal wire or the like is sintered, and the high pressure fire extinguishing gas can be smooth and slow. The depressurization expansion can effectively realize the silencing effect without reducing the flow rate. Such a sound deadening material 208 can be appropriately selected and used depending on the flow conditions of the fire extinguishing gas such as the diameter, length, number, and formation position of the nozzle holes 204, and porous materials having different air gaps can be appropriately selected and used. Further, as the noise reduction material 208, for example, a plurality of layers of wire mesh may be laminated, or a plate-like formed product or a porous member made of synthetic resin fibers may be used.

  The sound deadening material 208 is formed, for example, in a flat plate shape such as a disk, and a plurality of sheets are respectively stacked. Each of the overall shapes of the stacked silencer materials 208 is, for example, a cylindrical shape. The end face 220 of one axial direction side (left side in FIG. 12) of the laminated noise reduction material 208 faces, for example, contacts the ejection head main body 201, and the circumferential surface 224 of the laminated noise reduction material 208 is Open to the atmosphere.

  The pressing member 228 presses the end surface 225 of the other side (right side in FIG. 12) of the stacked noise reduction members 208. The pressing member 228 is in the form of a flat plate, and is made of a ring-shaped metal extending along the peripheral edge portion of the silencer material 208.

  The mounting member 227 is, in this embodiment, a bolt as a screw member and is indicated using the same reference numerals. A plurality (for example, 3) of the mounting members 227 are arranged in axial symmetry at equal intervals around the axis L203. The shaft portion of the mounting member 227 passes through the bolt insertion holes respectively formed in the pressing member 228 and the sound deadening material 208, and the head of the mounting member 227 is the side opposite to the sound deadening material 208 of the pressing member 228 (FIG. 12). Lock on the right side of The external thread formed on the shaft portion of the mounting member 227 is pierced in the outward flange 206 of the injection head main body 201, and thus, it is detachably screwed to the screw. Thus, the mounting member 227 sandwiches and fixes the laminated noise reduction 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 14 a of the conduit 14, the jet head 200 and the silencing means 202 are in a straight line. The workability of connecting the base 205 of the jet head main body 201 by the first screw 212 to the end 14 a of the conduit 14 in the state where the noise reduction means 202 is attached to the jet head 200 is good.

  The axis L103 of the end 14a of the conduit 14 is such that the axes of the jet head 200 including the jet head body 201, the silencing member 208, and the pressing member 228 are in a straight line. Therefore, the workability of the connection by the first screw 212 between the end 14a of the conduit 14 and the base 205 of the ejection head body 201 and the connection by the second screw 207 between the ejection head body 201 and the nozzle member 234 is good. . The fact that the connection workability is good means that in many cases the injection head 200 and the noise reduction means 202 have a ceiling higher than a person who is not an obstacle to the movement of a person or the like in the fire extinguishing section in the building. It is important in view of being connected to a place such as

  At the time of fire extinguishing, the high pressure fire extinguishing gas injected through the nozzle hole 204 passes through the fine air gap of the sound deadening material 208 gradually, smoothly, smoothly, and passes through under reduced pressure, reducing the generation of sound It is controlled and injected into the space in the fire extinguishing section in the building. The fire extinguishing gas from the circumferential surface 224 of the sound deadening material 208 can be horizontally and radially injected near the ceiling and can be diffused uniformly and rapidly throughout the space in the fire suppression target section. Therefore, it is possible to achieve rapid extinguishment of the fire extinguishing area.

  By this muffling material 208, it is possible to attenuate the sound caused by the jet flow of the extinguishing gas from the jet head while miniaturizing the configuration, and adjusting the characteristics of the jet and muffling accurately, without reducing the extinguishing gas flow rate Can achieve a great sound reduction effect.

  In the above-described embodiment, the silencer 202 having a complicated configuration as compared with the jet head 200 can be attached to and detached from various jet heads 200 having different diameters of the nozzle holes 204 by the attachment member 227. Can be used commonly to various types of jet heads 200. By this common use, mass production of the silencer material 208 is easy and productivity is improved.

  In addition, depending on the necessity of muffling in the fire extinguishing section, individual selective use is easily possible, and by removing the fire extinguishing target section without the need for muffling, it is possible to Simplification can be achieved. Furthermore, the muffling means 202 removed from the extinguishing target section where the need for muffling has been eliminated can be attached to another extinguishing target section to be muffled and reused, thereby providing good economic efficiency and energy saving. Can be achieved.

  In another embodiment of the present invention, the jet head 200 and the silencing means 202 may be configured integrally, i.e. non-removable. In this embodiment, the base 205 of the jet head body 201 is detachably provided at the end 14a of the conduit 14 by the first screw 212, and various jet heads 200 having different diameters of the nozzle holes 204 are individually It may be selected and used.

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

  Furthermore, in order to make the existing fire extinguishing target section in which the base 205 of the jet head main body 201 is connected to the end 14 a of the conduit 14 by the first screw 212 into the fire extinguishing target section to be silenced, When connecting the noise reduction means 202 by the attachment member 227, the workability of the connection is also good.

  A gap 215 having a gap ΔL2 in the direction of the axis L203 is present between the end face of the silencing material 208 facing the nozzle hole 204 and the end face of the ejection head main body 201 facing the silencing material 208. When the extinguishing gas is injected from the nozzle hole 204, fine foreign matter is stored in the gap and stored, so that clogging of the nozzle hole 204 with foreign matter can be prevented, and noise due to clogging of foreign matter can be prevented. It is possible to prevent a drop in flow rate at the time of generation and release.

  Foreign matter is present in the conduit 14 and, for example, welded scale and slag in the conduit 14, when the conduit is a plated pipe, peeling pieces of the plated layer in the plated pipe, rust, and the seal material used in the pipe joint It is a fragment etc. Further, due to the pressure reduction inside the injection head 100 and the discharge of the extinguishing gas outward in the radial direction, the injection reaction force acting in the backward direction (leftward in FIG. 12) from the injection head 100 to the conduit 14 at the extinguishment gas injection is It can be reduced to about 1/9 of the prior art shown in FIG.

  In another embodiment of the present invention, the end face of the noise reduction material 208 in the above-described embodiment disposed on the nozzle hole 204 side and the end face of the ejection head main body 201 disposed opposite to the noise reduction material 208 It has been confirmed by the present inventor that the silencing effect does not decrease even if the space is separated. The experiments and their results are described below with reference to FIGS. 14 and 15.

FIG. 14 is a cross-sectional view showing the jet head 500 and the muffling means 502 and 502a for which experiments were conducted by the present inventor. In FIG. 14 (1), the extinguishing gas which is the N ₂ gas from the conduit 514 is jetted from the nozzle hole 504 of the jet head 500.

  In the straight cylindrical housing 551 of the muffling means 502 attached to the jet head 500, eleven muffling materials 508 are stacked and stored. The extinguishing gas which has passed through the sound deadening material 508 is released from the discharge hole 552 of the housing 551 into the space in the extinguishing target compartment. The silencing material 508 is in close contact with the flat end face of the outlet end of the nozzle hole 504 of the jet head 500.

The supply pressure of the extinguishing gas supplied from the conduit 514 to the jet head 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is about 55 m ³ / min, and the flow rate of the extinguishing gas discharged from the nozzle hole 504 Is about 60 to 100 m / sec. The void ratio of the void 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 muffling material 508 of the muffling means 502 a is disposed with a gap 553 of about 1 mm from the flat end face of the outlet end of the nozzle hole 504 of the jet head 500. It is the same as 1).

  FIG. 15 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention released the extinguishing gas by the configuration of FIG. The line 554 is an experimental result by the configuration in which the sound deadening material 508 is in close contact with the flat end face of the outlet end of the nozzle hole 504 as shown in FIG. 14 (1). In the experiment, the noise eliminator 508 is arranged with the gap 553 open from the flat end face of the outlet end of the nozzle hole 504.

  From these experimental results, according to the configuration (FIG. 14 (1)) in which the silencer material 508 is in close contact with the flat end face of the outlet end of the nozzle hole 504 (FIG. 14 (1)) As compared with (2), it was confirmed that a noise reduction effect as large as about 16 dB was obtained. Therefore, it is confirmed that the muffling effect is improved according to the embodiment in which the end face of the muffling material 508 opposed to the nozzle hole 504 and the end face of the ejection head 500 opposed to the muffling material 508 are in close contact with each other. It was done.

  Therefore, as in the embodiment of FIGS. 10 to 13, a gap 215 is provided between the end face of the muffling material 208 facing the nozzle hole 204 and the end face of the ejection head main body 201 facing the muffling material 208. In this case, by setting the distance 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, clogging of the muffling material 208 with foreign matter is prevented without substantially reducing the muffling effect. It can be prevented.

  FIG. 16 is a cross-sectional view showing a gas extinguishing system according to another embodiment of the present invention. The above-described guide member 221 is omitted in the noise reduction means 600 of this gas extinguishing system. The function of the guide member 221 will be described with reference to FIG.

  The extinguishing gas from each of the plurality of nozzle holes 609 formed uniformly on the entire surface of the nozzle portion 608 corresponding to the flat end face 241 of the injection head main body 601 is parallel to each other of the nozzle holes 609. It jets along a certain axis, and passes through the fine air gap of the sound deadening material 613 disposed downstream of the nozzle hole 609 gradually, smoothly, smoothly, and decompressed and expanded. The axes of the jet head main body 601 and the silencing material 613 are on a straight line. The fine air gaps in the silencer material 613 cause pressure loss to the extinguishing gas passing therethrough.

  Assuming that the path followed by the extinguishing gas injected from the nozzle hole 609 into the noise eliminator 613 is straight for the sake of simplicity, the nozzle 608 has a substantially straight cylindrical shape as a whole. The path length to the lowermost end face is indicated by reference symbol L601 in FIG.

  The path length from the side of the nozzle portion 608 to the circumferential surface of the silencer material 613 is indicated by reference numeral L602 in FIG. In order to increase the flow rate of the extinguishing gas injected from the nozzle portion 608, the outer diameter of the nozzle portion 608 is configured to be relatively larger than the length in the axial direction of the noise reduction material 613, L601> L602.

  The pressure loss acting on the extinguishing gas is proportional to these path lengths L601 and L602, and therefore the distribution of pressure loss in the silencer material 613 is as an isobar line 603 connecting the positions that produce equal pressure loss. The pressure loss is the largest in the area on the axis of the sound deadening material 613, and becomes smaller as it gets to the peripheral area away from the axis. Since the extinguishing gas injected from the nozzle portion 608 is likely to flow into the area where the pressure loss is small, the extinguishing gas is indicated by an imaginary line reference 604 in the axial direction of the injection head main body 601 in the silencer material 613. It also travels laterally as shown by reference 605 and also in the backward direction as shown by reference 606. The lengths of the reference marks 604, 605, 606 are indicated corresponding to the flow rate of the extinguishing gas, and a relatively large flow of extinguishing gas flows in the lateral and back directions. In order to fill the fire extinguishing gas quickly into the fire extinguishing target section, the sound deadening material installed near the wall surface (left side in FIG. 16) among the plurality of sound deadening materials 613 is an imaginary line along the axial direction of the jet head main body 601. In the direction indicated by reference 604 and in the direction indicated by reference 605 laterally, the flow of fire extinguishing gas is controlled at the highest possible flow rate, and as indicated by reference 606 in the backward direction. There must be.

  In each of the embodiments described above with reference to FIGS. 10 to 16 of the present invention, the guide member 221 is a fire extinguishing gas traveling in a direction 606 behind FIG. And advance in the axial direction 604 and side 605 of the jet head body 601. Thus, the fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target area where the fire extinguishing gas reach distance is 15 m or more, for example, and the space in the fire extinguishing target compartment is uniformly dispersed to a predetermined concentration of extinguishing agent in a short time. It can be reached and extinguished.

  The gas fire extinguishing system of the present invention allows the fire extinguishing gas to be sufficiently diffused even in a large scale fire extinguishing target by releasing the extinguishing gas as a extinguishing agent into the space in the fire extinguishing target section of the building at the time of fire occurrence. Can be implemented extensively.

  A fire extinguishing gas injection device for injecting a high pressure fire extinguishing gas toward a space in a fire extinguishing target compartment in a building, wherein the fire extinguishing gas injection device includes a jet head 100 and a discharge of the fire extinguishing gas from the jet head 100 And the noise reduction means 202 is provided on the downstream side of the first noise reduction member as a noise reduction material 208 as a first noise reduction member provided on the jet head 100 side. The first and second silencer members are each formed in a flat plate shape and made of a porous material through which gas can flow. A cylindrical shape is configured by laminating the first and second sound deadening members. The first and second silencer members have the same outer diameter. The first and second silencer members have the same thickness. The entire outer peripheral surface of the first and second noise reduction members is exposed to the atmosphere. The pressure sensor further includes a pressing member 228 as an annular member for fixing the second muffling member.

  FIG. 17 is a perspective view showing a part of the configuration including the injection head 300 and the muffling means 302 of the gas extinguishing system of one embodiment of the present invention. The gas extinguishing system of the present embodiment is provided in the fire extinguishing section of the building, and connected to the jet head 300 for jetting high pressure fire extinguishing gas toward the space in the fire extinguishing target section, and the jet head 300 connected From a conduit 314 leading high pressure fire extinguishing gas to 300, a extinguishing gas supply source 315 supplying high pressure extinguishing gas to the conduit 314, and a nozzle hole 304 formed in the jet head 300 (see FIG. 19 described later) And muffling means 302 for attenuating the sound generated due to the injection of the extinguishing gas to be injected.

The 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 fire extinguishing area where the extinguishing gas reach distance is 15 m or more, for example, and the space in the fire extinguishing area reaches the predetermined extinguishant concentration uniformly in a short time. You can let it go and extinguish it.

  The extinguishing gas injection unit 311 is configured by the injection head 300 and the muffling means 302. In such a extinguishing gas injection unit 311, the extinguishing gas is supplied from the 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 intervened in the main pipe 323, and a branch pipe 319 connected to the branch pipe 318. The high pressure extinguishing gas from the gas supply 315 is directed to the spray 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 in the housing of the building in a state where vibration and displacement are suppressed.

  FIG. 18 is a perspective view showing the jet head 300 and the muffling means 302, and FIG. 19 is a cross-sectional view showing the jet head 300 and the muffling means 302. As shown in FIG. The injection head 300 is installed on the ceiling in order to release the extinguishing gas to the space in the extinguishing target section in a gas fire extinguishing apparatus using the extinguishing gas. The jet head 300 has a jet head body 301 and a nozzle member 339. The noise reduction means 302 is attached to the jet head body 301.

  In the jet head 300, the jet head body 301 has a base 337 and an outward flange 338 connected to the base 337. At the end 303 of the conduit 314, the base 337 of the injection head 300 is removably connected by means of a 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 upper and lower axes L 303 of the end 303 of the conduit 314. The cylindrical portion 340 is continuous with the peripheral wall 342 in which the plurality of nozzle holes 304 are formed, and one axial end (upper side in FIG. 19) of the peripheral wall 342. And a proximal end 306 connected thereto. The end wall 341 closes the other axial end (lower side in FIG. 19) of the peripheral wall 342. The nozzle holes 304 limit the flow rate of the extinguishing gas to a desired value.

The proximal end portion 306 of the nozzle member 339 is detachably provided on the base 337 of the jet head body 301. Various types of 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. Describe the reason. The gas extinguishing system will quickly fill the space in the extinguishing area with extinguishing gas while securing a large flow rate (for example, 20,000 to 100,000 liters / minute) necessary for extinguishing which is the original function of the gas extinguishing system. It must be configured to be able to release the extinguishing gas, ensuring a high flow rate (eg 100 m / s). Therefore, the Fire Service Law stipulates that the radiation pressure of the extinguishant gas from the nozzle hole 304 of the jet head 300 in the gas extinguishing system is 1.9 MPa or more, and in practice, it is 2-3 MPa (≒ 20-30 kgf / cm ^2, Note, carried out at high radiation pressures further to as high 6MPa ≒ 60kgf / cm ^2).

  Therefore, the value of the bore diameter of the nozzle hole 304 of the injection head 300 is injected from the extinguishing gas source 315 so that the extinguishant gas injected from the nozzle hole 304 achieves the above-mentioned large flow rate, high flow rate and high radiation pressure. Depending on the length of the conduit 314 up to the installation location of the head 300 etc. and thus the conduit resistance, it has to be set. Therefore, the bore diameter of the nozzle hole 304 differs depending on the length of the conduit 314 and the like, and accordingly, the various jetting heads 300 having different bore diameters of the nozzle hole 304 are individually selected and used for each installation location of the jetting head 300 Must. As described above, in the gas extinguishing system, various injection heads 300 having different diameters of the nozzle holes 304 are indispensable.

  The noise reduction means 302 has a noise reduction material 308, a pressing member 328 and an attachment member 327. The sound deadening material 308 is made of porous material through which gas can flow, for example, made of porous metal in which fine metal powder or fine metal wire or the like is sintered, or, for example, by laminating multiple layers of wire mesh. It may be configured or may be made of synthetic resin. Such a sound deadening material 308 can be used by appropriately selecting and using porous materials with different gaps depending on the flow conditions of the extinguishing gas, such as the diameter, length, number, and formation position of the nozzle holes 304.

  The sound deadening material 308 is formed, for example, in a flat plate shape such as a disk, and a plurality of sheets are stacked. The entire shape of the stacked silencer materials 308 is, for example, a cylindrical shape. The end face 320 of one axial direction side (the upper side in FIG. 19) of the laminated sound deadening material 308 faces, for example, is placed in contact with the lower surface of FIG. The circumferential surface 324 of the muffling material 308 is open to the atmosphere. An insertion hole 310 through which the cylindrical portion 340 of the nozzle member 339 is inserted is formed in the silencer material 308.

  The pressing member 328 presses the end surface 325 of the other side (the lower side in FIG. 19) of the silencers 308 stacked. The pressing member 328 is in the form of a flat plate and has a circumferential surface extending along the circumferential surface 324 of the silencer material 308.

  The mounting member 327 is a bolt as a screw member in this embodiment, and is indicated using the same reference numerals. A plurality of (for example, six) bolts 327 are arranged at equal intervals around the axis L303. The shaft portion of the bolt 327 is inserted through the bolt insertion holes respectively formed in the pressing member 328 and the sound deadening material 308, and the head of the bolt 327 is the opposite side of the pressure deadening material 308 of the pressing member 328 (downward in FIG. Lock to). The external thread formed on the shaft portion of the bolt 327 is pierced in the outward flange 338 so as to be releasably screwed on the thread. By this, the bolt 327 clamps and fixes the laminated silencer material 308 between the outward flange 338 and the pressing member 328.

  Each axis of bolt 327 is parallel to axis L 303 of end 303 of conduit 314. The axes of the end 303 of the conduit 314, the jet head 300 and the silencing means 302 are in a straight line. The workability of connecting the base 337 of the jet head main body 301 by the first screw 312 to the end portion 303 of the conduit 314 in the state where the noise reduction means 302 is attached to the jet head 300 is good.

  The axis L303 of the end portion 303 of the conduit 314 is such that the axes of the jet head 300 including the jet head body 301 and the nozzle member 339, the silencing material 308, and the pressing member 328 are in a straight line. Therefore, the connection between the end 303 of the conduit 314 and the base 337 of the ejection head body 301 by the first screw 312 and the connection between the base 337 of the injection head body 301 and the proximal end 306 of the nozzle member 339 by the second screw 307 Workability of is good. The fact that the connection workability is good means that in many cases the jet head 300 and the noise reduction means 302 have a ceiling higher than a person who is not an obstacle to the movement of a person or the like in the fire extinguishing section in the building. It is important in view of being connected to a place such as

  At the time of fire extinguishing, the high pressure fire extinguishing gas injected through the nozzle hole 304 passes through the fine air gap of the sound deadening material 308 gradually, smoothly, smoothly, and passes through under reduced pressure, reducing the generation of sound It is controlled and injected into the space in the fire extinguishing section in the building. The fire extinguishing gas from the circumferential surface 324 of the sound deadening material 308 can be horizontally and radially sprayed near the ceiling to diffuse uniformly and rapidly throughout the space in the fire suppression target section. Therefore, it is possible to achieve rapid extinguishment of the fire extinguishing area.

  This noise reduction material 308 can achieve a large sound reduction effect while miniaturizing the configuration.

  In the above-described embodiment, the muffling means 302 having a complicated configuration as compared with the jet head 300 can be attached to and detached from various kinds of jet heads 300 having different diameters of the nozzle holes 304 by the bolts 327. Can be commonly used for various types of ejection heads 300. By this sharing, mass production of the muffling means 302 is easy, and the productivity is improved.

  In addition, depending on the necessity of muffling in the fire extinguishing section, individual selective use is easily possible, and by removing the fire extinguishing target section without the need for muffling, it is possible to Simplification can be achieved. Furthermore, the muffling means 302 removed from the extinguishing target section where the need for muffling has been eliminated can be attached to another extinguishing target section to be muffled and reused, thereby providing good economic efficiency and energy saving. Can be achieved.

  In another embodiment of the present invention, the jet head 300 and the silencing means 302 may be configured integrally, i.e. non-removable. In this embodiment, the base 337 of the jet head body 301 is detachably provided at the end 303 of the conduit 314 by the first screw 312 so that various jet heads 300 having different diameters of the nozzle holes 304 can be individually It may be selected and used.

  Also, the jet head 300 and the noise reduction 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 jet head body 301 in this assembly is the end of the conduit 314 The workability of connecting to the portion 303 by the first screw 312 is also good.

  Furthermore, the existing fire control target section to which the base portion 337 of the jet head main body 301 is connected to the end portion 303 of the conduit 314 by the first screw 312 is the outside of the jet head main body 301 to make it a fire control target section. When connecting the silencer means 302 to the facing flange 338 by means of the mounting member 327, the workability of the connection is also good.

  A gap is present between the inner circumferential surface of the insertion hole 310 of the noise reduction material 308 and the outer circumferential surface of the cylindrical portion 340 of the nozzle member 339. When the extinguishing gas is injected from the nozzle hole 304, fine foreign matter is stored in the gap and stored, so that clogging of the nozzle hole 304 with foreign matter can be prevented and noise due to clogging of foreign matter It is possible to prevent a drop in flow rate at the time of generation and release.

  Foreign matter is present in the conduit 314 and, for example, welded scale and slag in the conduit 314, when the conduit is a plated pipe, peeling pieces of the plated layer in the plated pipe, rust, and the seal material used in the pipe joint It is a fragment etc. Further, the injection reaction force acting in the backward direction (leftward in FIG. 19) from the injection head 100 to the conduit 14 at the time of the extinguishing gas injection by the pressure reduction inside the injection head 100 and the discharge of the extinguishing gas radially outward It can be reduced to about 1/9 of the prior art shown in FIG.

  In another embodiment of the present invention, the inner peripheral surface of the insertion hole 310 of the noise reduction material 308 and the outer peripheral surface of the cylindrical portion 340 of the nozzle member 339 are in close contact with each other. It has been confirmed by the present inventor that this configuration improves the muffling effect. The experiments and their results are described below with reference to FIGS. 20 and 21.

FIG. 20 is a cross-sectional view showing an injection nozzle 500 and muffling means 502 and 502a for which experiments were conducted by the present inventor. In FIG. 20 (1), the extinguishing gas which is the N ₂ gas from the conduit 514 is jetted from the nozzle hole 504 of the jet head 500. In the straight cylindrical housing 551 of the noise reduction means 502 attached to the jet head 500, eleven noise reduction materials 508 are packed and stored. The extinguishing gas that has passed through the sound deadening material 508 is released from the release holes 52 of the housing 551 into the space in the extinguishing target compartment. The silencing material 508 is in close contact with the flat end face of the outlet end of the nozzle hole 504 of the jet head 500.

The supply pressure of the 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 extinguishing gas is about 55 m ³ / min, and the flow rate of the extinguishing gas discharged from the nozzle hole 504 Is about 60 to 100 m / sec. The void ratio of the void 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 muffling material 508 of the muffling means 500a is disposed with a gap 553 of about 1 mm from the flat end face of the outlet end of the nozzle hole 504 of the jet head 500. It is the same as.

  FIG. 21 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention released the extinguishing gas by the configuration of FIG. The line 554 is an experimental result by the configuration in which the silencer material 508 is in close contact with the flat end face of the outlet end of the nozzle hole 504 as shown in FIG. 20 (1). This is an experimental result of the configuration in which the sound absorbing material 508 is disposed with the gap 553 opened from the flat end face of the outlet end of the nozzle hole 504.

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

  Therefore, as in the embodiment of FIGS. 17 to 20, the gap 315 is provided between the end face of the noise elimination material 308 facing the nozzle hole 304 and the end face of the ejection head main body 301 opposite to the noise elimination material 308. In this case, by setting the distance 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 with foreign matter is prevented without substantially reducing the muffling effect. can do.

  The gas fire extinguishing system of the present invention allows the fire extinguishing gas to be sufficiently diffused even in a large scale fire extinguishing target by releasing the extinguishing gas as a extinguishing agent into the space in the fire extinguishing target section of the building at the time of fire occurrence. Can be implemented extensively.

  A fire extinguishing gas injection device for injecting a high pressure fire extinguishing gas toward a space in a fire extinguishing target compartment in a building, wherein the fire extinguishing gas injection device includes a jet head 300 and a discharge of the fire extinguishing gas from the jet head 300 And the muffling means 302 is provided on the downstream side of the first muffling member as the muffling material 308 as the first muffling member provided on the jet head 300 side. The first and second silencer members are each formed in a flat plate shape and made of a porous material through which gas can flow. A cylindrical shape is configured by laminating the first and second sound deadening members. The first and second silencer members have the same outer diameter. The first and second silencer members have the same thickness. The entire outer peripheral surface of the first and second noise reduction members is exposed to the atmosphere. The pressure sensor further includes a plate-like pressing member 328 for fixing the second muffling member.

  FIG. 22 is a perspective view showing a part of the configuration including the injection head 400 and the muffling means 402 of the gas extinguishing system of one embodiment of the present invention. The gas extinguishing apparatus of the present embodiment is connected to a jet head 400 provided on a wall in a fire extinguishing section of a building and injecting high pressure extinguishing gas toward a space in the fire extinguishing target section, and the jet head 400 is connected. A conduit 14 for guiding a high pressure fire extinguishing gas to the jet head 400, a extinguishing gas supply source 15 for supplying a high pressure fire extinguishing gas to the conduit 14, and a nozzle hole 404 formed in the jet head 400 (see FIG. 24 described later) And muffling means 402 for attenuating the sound generated due to the injection of the extinguishing gas jetted from the air conditioner.

The extinguishing gas is realized by noncombustible gas such as N ₂ gas, CO ₂ gas and halide gas. Such fire extinguishing gas is sufficiently diffused even in a large fire extinguishing area where the extinguishing gas reach distance is 15 m or more, for example, and the space in the fire extinguishing area reaches the predetermined extinguishant concentration uniformly in a short time. You can let it go and extinguish it.

  The extinguishing gas injection unit 411 is configured by the injection head 400 and the muffling means 402. In such a extinguishing gas injection unit 411, the extinguishing gas is supplied from the 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 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 the fire extinguishing via such a pipe 14 The high pressure extinguishing gas from the gas supply source 15 is led to the injection head 400. The conduit 14 is fastened to the base 20 and the bracket 21 by a fastener 22 such as a U-bolt, and is installed in the housing of the building in a state in which vibration and displacement are suppressed.

  FIG. 23 is a perspective view showing the jet head 400 and the muffling means 402, and FIG. 24 is a cross-sectional view showing the jet head 400 and the muffling means 402. As shown in FIG. The injection head 400 having a muffling function is installed on the wall to release the extinguishing gas to the section to be extinguished in the gas system extinguishing facility using the extinguishing gas, and the muffling means 402 is attached to the injection head main body 401 Be configured.

  The mounting assisting member 403 has a base 405 and an outward flange 406 connected to the base 405. The base portion 405 is detachably and removably attached to the jet head body 401 by a screw 407. A nozzle member 409 having a nozzle hole 404, which is a choke, is detachably attached to the attachment assisting member 403 by a screw 410. The nozzle holes 404 limit the flow rate of the extinguishing gas to a desired value.

  The muffling means 402 is composed of a muffling material 408 made of a porous material through which gas can flow. The silencer material 408 has a plurality of members each having a thin disk shape and a thin annular shape, and these members are stacked. The overall shape of the laminated silencers 408 is substantially cylindrical. Such a sound deadening material 408 is appropriately selected from porous materials having different gaps according to the flow conditions of the extinguishing gas, such as the diameter and length of the nozzle holes 404, the number of the nozzle holes 404, and the formation position. It can be used.

  In the nozzle member 409, a gap 415 is formed between the end surface of the outlet of the nozzle hole 404 and the sound deadening material 408, for holding foreign matter such as fine rust from the nozzle hole 404 and stored therein. Prevent clogging by foreign substances.

  The end surface 420 of one side (left of FIGS. 24 and 25) of the noise reduction material 408 is disposed in contact with the annular attachment portion 422 of the guide member 421 and facing the outward flange 406 of the attachment assisting member 403. . The guide member 421 has the attachment portion 422, a short cylindrical guide portion 423 which is connected to the attachment portion 422 and guides the extinguishing gas, and an expansion portion 443 which will be described later.

  The end face 425 on the other side (rightward in FIGS. 24 and 25) of the noise reduction material 408 is a ring-shaped presser for fixing the noise reduction material 408 to the outward flange 406 of the attachment assisting member 403 via the attachment member 427 such as a bolt. It is open to the atmosphere except for the portion in contact with the member 428. The shaft portion of the mounting member 427 is screwed to the outward flange 406 of the mounting support member 403 through the pressing member 428, the sound deadening material 408, and the mounting portion 422 of the guide member 421.

  The circumferential surface 424 of the sound deadening material 408 is in close contact with the short cylindrical shape of the guide portion 423 of the guide member 421, more specifically, the cylindrical inner circumferential surface. The guide portion 423 is formed so as to expand radially outward as it gets farther to the downstream side than the pressing member 428 in the injection direction of the extinguishing gas than the pressing member 428, that is, in a substantially truncated cone shape.

  Since the guide member 421 has the expanded portion 443, the extinguishing gas discharged from the end surface of the other end in the axial direction of the silencer material 408 diffuses radially outward with respect to the axis L403 of the jet head 400 immediately after discharge. It is possible to reduce the amount of extinguishing gas required in the section to be extinguished by allowing the extinguishing gas to reach a distant place.

  The mounting portion 422 of the guide member 421 is fitted on a mounting seat 431 formed in an annular recess on the outward flange 406 of the mounting support member 403 as shown in FIG. It projects from the end face 432 (lower side in FIG. 25) by a gap ΔL4.

  The end surface 420 of one side (left side in FIGS. 24 and 25) of the sound deadening material 408 is disposed in contact with the annular attachment portion 422 of the guide member 421 and facing the outward facing flange 406 of the attachment assisting member 403 The end surface 420 of one side (leftward in FIGS. 24 and 25) of the sound deadening material 408 has a gap ΔL4 with the end surface 432 of the outward flange 406 of the mounting support member 403 and is thus disposed in contact with the jet head body 401. It is not a configuration to be set up.

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

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

  The nozzle member 409 is attached to the attachment assisting member 403 by a screw 410. The nozzle member 409 has a nozzle hole 404 which is a choke.

  FIG. 25 is a partial enlarged cross-sectional view showing a state in which the guide member 421 is sandwiched between the attachment assisting member 403 and the sound deadening material 408. The end surface 420 of one side (left of FIGS. 24 and 25) of the noise reduction material 408 is disposed in contact with the annular attachment portion 422 of the guide member 421 and facing the outward flange 406 of the attachment assisting member 403. . The guide member 421 has the attachment portion 422 and a short cylindrical guide portion 423 which is connected to the attachment portion 422 and guides the extinguishing gas.

  The circumferential surface 424 of the sound deadening material 408 and the end face 425 on the other side (rightward in FIGS. 23 and 24) are holding members 428 for fixing the sound deadening material 408 to the outward flange 406 of the attachment assisting member 403 via the attachment member 427. It is open to the atmosphere except for the part in contact with the The shaft portion of the mounting member 427 is screwed to the outward flange 406 of the mounting support member 403 through the pressing member 428, the sound deadening material 408, and the mounting portion 422 of the guide member 421.

  The mounting portion 422 of the guide member 421 is fitted on a mounting seat 431 formed in an annular recess on the outward flange 406 of the mounting support member 403 as shown in FIG. It projects axially from the end face 432 (downward in FIG. 25) by a gap ΔL1.

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

  The mounting assisting member 403 is detachably provided on the base 437 of the jet head main body 401. Various ejection head bodies 401 having different bore diameters of the nozzle holes 404 are individually selected and used depending on the length of the conduit 14 and the like. Describe the reason.

The gas extinguishing system will quickly fill the space in the extinguishing area with extinguishing gas while securing a large flow rate (for example, 20,000 to 100,000 liters / minute) necessary for extinguishing which is the original function of the gas extinguishing system. It must be configured to be able to release the extinguishing gas, ensuring a high flow rate (eg 100 m / s). Therefore, the Fire Service Law stipulates that the radiation pressure of the extinguishing gas from the nozzle hole 404 of the injection head 400 in the gas extinguishing system is 1.9 MPa or more, and in practice, 2 to 3 MPa (≒ 20 to 30 kgf / It is carried out at a high radiation pressure of cm ² and still higher up to about 6 MPa ≒ 60 kgf / cm ² ).

  Therefore, the value of the bore diameter of the nozzle hole 404 of the injection head 400 is determined by the injection head 15 from the extinguishing gas supply source 15 so that the extinguishing gas injected from the nozzle hole 404 achieves the high flow rate, high flow rate and high radiation pressure described above. Depending on the length of the conduit 14 up to the installation site of 400, etc. and thus the conduit resistance, it has to be set.

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

  The noise reduction means 402 has a plurality of noise reduction members 408, a pressing member 428 and an attachment member 427. The sound deadening material 408 is made of a porous material through which gas can flow, for example, made of porous metal in which fine metal powder or fine metal wire or the like is sintered, and the high pressure fire extinguishing gas can be smooth and slow. A muffling effect can be realized effectively without reducing the flow rate by reduced pressure expansion, and as the muffling material 408, for example, a plurality of layers of wire mesh may be laminated, and a plate made of synthetic resin fibers It may be a molded article or a porous member.

  The sound deadening material 408 is formed in, for example, a flat plate shape such as a disk, and a plurality of sheets are stacked. Each of the overall shapes of the stacked silencer materials 408 is, for example, a cylindrical shape. The circumferential surface 424 of the laminated sound deadening material 408 is tightly enclosed by the cylindrical inner circumferential surface of the guide portion 423 of the guide member 421, and therefore is 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 stacked noise reduction materials 408. The pressing member 428 has a flat plate shape, and has a circumferential surface 426 extending along the circumferential surface 424 of the silencer material 408.

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

  The external thread formed on the shaft portion of the mounting member 427 is pierced and formed in the outward flange 406 of the mounting support member 403 so as to be removably screwed to the screw. By this, the mounting member 427 clamps and fixes the stacked sound deadening material 408 between the mounting support member 403 and the pressing member 428, and thus between the jet head main body 401 and the pressing member 428.

  Each axis of the mounting member 427 is parallel to the axis L 403 of the end 14 a of the conduit 14. The axes of the end 14 a of the conduit 14, the jet head 400 and the silencing means 402 are in a straight line. The workability of connecting the base 437 of the jet head main body 401 by the first screw 412 to the end 14 a of the conduit 14 in the state where the noise reduction means 402 is attached to the jet head 400 is good.

  The axis L403 of the end portion 14a of the conduit 14 is such that the axes of the jet head 400 including the jet head main body 401, the silencing material 408, and the pressing member 428 are on one straight line. Therefore, the workability of the connection by the first screw 412 of the end 14a of the conduit 14 and the base 437 of the ejection head main body 401 and the connection by the second screw 407 of the base 437 of the injection head main body 401 and the attachment assisting member 403 is , Is good. The fact that the connection workability is good means that in many cases the injection head 400 and the noise reduction means 402 have a ceiling higher than a person at a location that does not hinder movement of a person or the like in a fire suppression section in a building. It is important in view of being connected to a place such as

  At the time of fire extinguishing, the high pressure fire extinguishing gas injected through the nozzle hole 404 passes through the fine air gap of the sound deadening material 408 gradually, smoothly, smoothly, and passes through under reduced pressure to reduce generation of sound. It is controlled and injected into the space in the fire extinguishing section in the building. The fire extinguishing gas from the circumferential surface 424 of the sound deadening material 408 can be horizontally and radially injected near the ceiling and can be diffused uniformly and rapidly throughout the space in the fire suppression target section. Therefore, it is possible to achieve rapid extinguishment of the fire extinguishing area.

  With this sound deadening material 408, a large sound reduction effect can be achieved while downsizing the configuration.

  In the above-described embodiment, the silencing means 402 having a complicated configuration as compared with the ejection head 400 can be attached to and detached from various ejection heads 400 having different diameters of the nozzle holes 404 by the attachment member 427. Can be used commonly to various types of jet heads 400. This common use facilitates the mass production of the silencer material 408 and improves the productivity.

  In addition, depending on the necessity of muffling in the fire extinguishing section, individual selective use is easily possible, and by removing the fire extinguishing target section without the need for muffling, it is possible to Simplification can be achieved. Furthermore, the muffling means 402 removed from the extinguishing target section where the need for muffling has been eliminated can be attached to another extinguishing target section to be muffled and reused, thereby providing good economic efficiency and energy saving. Can be achieved.

  In another embodiment of the present invention, the jet head 400 and the silencing means 402 may be configured integrally, i.e. non-removable. In this embodiment, the base 437 of the jet head main body 401 is detachably provided at the end 14 a of the conduit 14 by the first screw 412 so that various jet heads 400 having different diameters of the nozzle holes 404 are individually It may be selected and used.

  Further, the noise reduction means 402 and the jet 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 jet head main body 401 in this assembly is the end of the conduit 14 The workability in connecting to the first screw 412 is also good.

  Furthermore, in order to make the existing fire protection target section to which the base 437 of the jet head main body 401 is connected to the end 14a of the conduit 14 by the first screw 412, the jet head main body 401 When the noise reduction means 402 is connected by the attachment member 427, the workability of the connection is also good.

  A gap 415 is present between the end face of the noise damping material 408 facing the nozzle hole 404 and the end face of the nozzle member 409 facing the noise damping material 408. When a fire extinguishing gas is injected from the nozzle hole 404, fine foreign matter is stored and stored in the gap 415, so that clogging of the silencer material 408 by foreign matter can be prevented and noise due to clogging of foreign matter Can prevent the decrease of the flow rate at the time of generation and discharge.

  Foreign matter is present in the conduit 14 and, for example, welded scale and slag in the conduit 14, when the conduit is a plated pipe, peeling pieces of the plated layer in the plated pipe, rust, and the seal material used in the pipe joint It is a fragment etc. Further, the injection reaction force acting in the backward direction (leftward in FIG. 24) from the injection head 400 to the conduit 14 at the time of the extinguishment gas injection by the pressure reduction inside the injection head 400 and the discharge of the extinguishing gas radially outward This can be reduced to about 1/9 of the prior art shown in FIG.

  In another embodiment of the present invention, the muffling of the ejection head 700 in which the ejection head main body 401 and the attachment assisting member 403 are integrated with the end face of the muffling material 408 in the above-described embodiment disposed on the nozzle hole 404 side. The inventors of the present invention have confirmed that the muffling effect does not decrease even when the material 408 and the end face disposed opposite to each other are separated. The experiments and their results are described below with reference to FIGS. 26 and 27.

FIG. 26 is a cross-sectional view showing the jet head 700 and the muffling means 701 and 701a for which experiments were conducted by the present inventor, and FIG. 27 is obtained when the present inventor releases the extinguishing gas by the configuration of FIG. It is a figure which shows the time progress of the sound pressure level made. In FIG. 26 (1), the extinguishing gas which is the N ₂ gas from the conduit 714 is jetted from the nozzle hole 704 of the jet head 700.

  On the downstream side (right side in FIG. 26) of the discharge direction of the extinguishing gas of the nozzle member 703 attached to the injection head 700, three sheets of the silencing members 706 are stacked and disposed. The fire extinguishing gas passes through the nozzle hole 704 of the nozzle member 703, flows into the silencer material 706, and is discharged from the other end surface 709 of the silencer material 706 in the axial direction from the discharge hole 752 of the pressing member 728 into the space in the extinguishing target compartment. Be done. The silencing material 706 is in close contact with the flat end face of the outlet end of the nozzle hole 704 of the nozzle member 703.

The supply pressure of the extinguishing gas supplied from the conduit 714 to the jet head 700 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is about 55 m ³ / min, and the flow rate of the extinguishing gas discharged from the nozzle hole 704 Is about 60 to 100 m / sec. The void ratio of the void 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 disposed with a gap 753 of about 1 mm in the axial direction from the flat end face of the outlet end of the nozzle hole 704 of the nozzle member 703. It is the same as FIG. 26 (1).

  FIG. 27 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention released the extinguishing gas by the configuration of FIG. The line 754 is an experimental result by the configuration in which the silencer material 706 is in close contact with the flat end face of the outlet end of the nozzle hole 704 as shown in FIG. 26 (1), and the line 755 is shown in FIG. This is an experimental result of the configuration in which the sound deadening material 705 is disposed by opening the gap 753 from the flat end face of the outlet end of the nozzle hole 704.

  From these experimental results, according to the configuration (FIG. 26 (1)) in which the sound deadening material 706 is in close contact with the flat end face of the outlet end of the nozzle hole 704 (FIG. 26 (1)) Compared to (2), it was confirmed that there was almost no difference in the silencing effect. Therefore, it has been confirmed that the muffling effect is not reduced even if a gap 753 is formed between the end face of the muffling material 706 facing the nozzle hole 704 and the end face of the jet head 700 facing the muffling material 706.

  By providing such a gap 753 between the end face of the noise reducing material 706 facing the nozzle hole 704 and the end face of the jet head 700 facing the noise reducing material 706, fine foreign matter does not deteriorate the noise eliminating effect. When the fire extinguishing gas is jetted from the nozzle hole 704 by being stored in the gap 753, clogging of the muffling material 706 due to foreign matter can be prevented and generation of noise due to clogging of the foreign matter can be prevented. Foreign matter is present in the conduit 14 and, for example, welded scale and slag in the conduit 14, when the conduit 14 is a plated pipe, peeling pieces of the plated layer in the plated pipe, rust, and a sealing material used in the pipe joint And so on.

  Therefore, as in the embodiment of FIGS. 22 to 26, the gap 415 is provided between the end face of the noise elimination material 408 facing the nozzle hole 404 and the end face of the ejection head main body 401 opposite to the noise elimination material 408. In this case, by setting the space ΔL 2 in the direction of the axis L 403 in such a range that the muffling effect does not decrease, for example, 0.1 mm to 1.5 mm, clogging of the muffling material 408 due to foreign matter is prevented without substantially reducing the muffling effect. It can be prevented.

FIG. 28 is a cross-sectional view showing the jet head 500 and the muffling means 502 and 502a for which experiments were conducted by the present inventor. In FIG. 28 (1), the extinguishing gas which is the N ₂ gas from the conduit 514 is jetted from the nozzle hole 504 of the jet head 500.

  In the straight cylindrical housing 551 of the muffling means 502 attached to the jet head 500, eleven muffling materials 508 are stacked and stored. The extinguishing gas which has passed through the sound deadening material 508 is released from the discharge hole 552 of the housing 551 into the space in the extinguishing target compartment. The silencing material 508 is in close contact with the flat end face of the outlet end of the nozzle hole 504 of the jet head 500.

The supply pressure of the extinguishing gas supplied from the conduit 514 to the jet head 500 is, for example, 3 MPa to 7 MPa, the discharge flow rate of the extinguishing gas is about 55 m ³ / min, and the flow rate of the extinguishing gas discharged from the nozzle hole 504 Is about 60 to 100 m / sec. The void ratio of the void 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 noise reduction material 508 of the noise reduction means 502a is disposed with a gap 553 of about 1 mm from the flat end face of the outlet end of the nozzle hole 504 of the jet head 500. It is the same as 1).

  FIG. 29 is a diagram showing the time course of the sound pressure level obtained when the inventor of the present invention released the extinguishing gas by the configuration of FIG. The line 554 is an experimental result by the configuration in which the silencer material 508 is in close contact with the flat end face of the outlet end of the nozzle hole 504 as shown in FIG. 28 (1), and the line 555 is as shown in FIG. In the experiment, the noise eliminator 508 is arranged with the gap 553 open from the flat end face of the outlet end of the nozzle hole 504.

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

  FIG. 30 is a cross-sectional view showing a gas extinguishing system according to another embodiment of the present invention. The guide member 421 described above is omitted in the noise reduction means 600 of the gas extinguishing system. The function of the guide member 421 will be described with reference to FIG.

  The extinguishing gas from the plurality of nozzle holes 609 formed uniformly distributed on the entire surface of the flat nozzle portion 608 of the jet head main body 601 is jetted along the mutually parallel axes of the nozzle holes 609, The fine air gap of the noise reduction material 613 and the noise reduction material 610 disposed downstream of the nozzle hole 609 gradually passes smoothly, smoothly, and decompressed and expanded. The axes of the jet head main body 601 and the silencing material 613 are on a straight line. The fine air gaps in the silencer material 613 cause pressure loss to the extinguishing gas passing therethrough.

  Assuming that the path followed by the extinguishing gas jetted from each nozzle hole 609 of the jet head main body 601 into the sound deadening material 613 is a straight line for simplification, the sound deadening material 613 whose entire shape is substantially right cylindrical The path length to the lowermost end face of is indicated by the reference L601 in FIG.

  The path length from the side of the jet head body 601 to the circumferential surface 614 of the silencer material 613 is indicated by reference numeral L602 in FIG. In order to increase the flow rate of the extinguishing gas injected from the nozzle hole 609, L601> L602 when the outer diameter of the injection head main body 601 is configured to be relatively larger than the length in the axial direction of the silencer material 613.

  The pressure loss acting on the extinguishing gas is proportional to these path lengths L601 and L602, and therefore the distribution of pressure loss in the silencer material 613 is as an isobar line 603 connecting the positions that produce equal pressure loss. The pressure loss is the largest in the area on the axis of the sound deadening material 613, and becomes smaller as it gets to the peripheral area away from the axis.

  Since the extinguishing gas injected from the nozzle hole 609 is likely to flow into the area where the pressure loss is small, the extinguishing gas is indicated by an imaginary line reference 604 in the axial direction of the injection head main body 601 in the muffling material 613 It also travels laterally as shown by reference 605 and also in the backward direction as shown by reference 606. The lengths of the reference marks 604, 605, 606 are indicated corresponding to the flow rate of the extinguishing gas, and a relatively large flow of extinguishing gas flows in the lateral and back directions.

  In order to fill the fire extinguishing gas quickly into the fire extinguishing target section, the sound deadening material installed near the wall surface (left side in FIG. 30) of the plurality of sound deadening materials 610 is a virtual line along the axial direction of the jet head main body 601. In the direction indicated by reference 604 and in the direction indicated by reference 605 laterally, the flow of fire extinguishing gas is controlled at the highest possible flow rate, and as indicated by reference 606 in the backward direction. There must be.

  In each of the embodiments described above with reference to FIGS. 22 to 29 of the present invention, the guide member 421 is a fire extinguishing gas advancing in a direction 606 behind FIG. And advance in the axial direction 604 and side 605 of the jet head body 601 of the jet head. Thus, the fire extinguishing gas is sufficiently diffused even in a large-scale fire extinguishing target area where the fire extinguishing gas reach distance is 15 m or more, for example, and the space in the fire extinguishing target compartment is uniformly dispersed to a predetermined concentration of extinguishing agent in a short time. It can be reached and extinguished.

  The gas fire extinguishing system of the present invention allows the fire extinguishing gas to be sufficiently diffused even in a large scale fire extinguishing target by releasing the extinguishing gas as a extinguishing agent into the space in the fire extinguishing target section of the building at the time of fire occurrence. Can be implemented extensively.

  A fire extinguishing gas injection device for injecting a high pressure fire extinguishing gas toward a space in a fire extinguishing target compartment in a building, wherein the fire extinguishing gas injection device includes a jet head 400 and a discharge of the fire extinguishing gas from the jet head 400 And the noise reduction means 402 is provided on the downstream side of the first noise reduction member as a noise reduction material 408 as a first noise reduction member provided on the jet head 400 side. The first and second silencer members are each formed in a flat plate shape and made of a porous material through which gas can flow. A cylindrical shape is configured by laminating the first and second sound deadening members. The first and second silencer members have the same outer diameter. The first and second silencer members have the same thickness. The entire outer peripheral surface of the first and second noise reduction members is exposed to the atmosphere. It further comprises a plate-like pressing member 428 for fixing the second muffling member.

(Supplementary Note 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 suppression area in a building;
(B) a conduit 14 having an end portion 14a to which the jet head 100 is connected, and which leads high pressure extinguishing gas to the jet head 100;
(C) a extinguishing gas supply source 15 for supplying a high pressure extinguishing gas to the conduit 14;
(D) A gas extinguishing apparatus including a sound deadening means 102 provided in the injection head 100 for attenuating the sound due to the discharge of the fire extinguishing gas from the nozzle hole 104,
(E) The ejection head 100 is
(E1) a jet head body 101 connected to the end 14a of the conduit 14;
(E2) a mounting support member 103 removably mounted on the jet head body 101;
(F) The silencing means 102 is
(F1) A flow straightening member 109 having a flow straightening hole 112 and detachably mounted on the mounting support member 103 so as to cover the nozzle hole 104 of the jet head main body 101;
(F2) A flat plate-like, porous material capable of circulating gas, and a plurality of first sound deadening materials 113, which are disposed by being stacked in layers, between the flow straightening member 109 and the jet head main body ,
(F3) A flat plate-like, made of a porous material through which gas can flow, and having a second silencer material 108 disposed on the flow straightening member 109 in a plurality of stacked layers in the discharge direction of the extinguishing gas It is a gas fire extinguisher characterized by the above.

  According to the supplementary note 1 invention, the high pressure fire extinguishing gas supplied from the fire extinguishing gas supply source 15 to the conduit 14 is jetted toward the space in the building through the jet head 100. Such a jet head 100 is provided with a muffling means 102, so that it is possible to prevent the generation of loud jet noise due to the jet flow of the extinguishing gas jetted from the nozzle holes 104 of the jet head 100 at high speed.

  The extinguishing gas flows from the conduit 14 through the nozzle hole 104 of the injection head 100, the first silencer material 113, and the flow straightening member 109 into the second silencer material 108, and passes through the fine gap of the second silencer material 108. The air is decompressed and expanded, and injected into the space in the fire extinguishing section in the building.

  With regard to the large sound reduction effect by the small configuration, at the time of extinguishment, the high pressure fire extinguishing gas injected through the nozzle hole 104 is decompressed and expanded by passing through the fine air gap of the first silencer material 113 and the flow straightening member After being rectified through the rectification hole 112 of 109, it flows into the second silencer 108 and is further decompressed and expanded, and thus it is decompressed smoothly and gradually without reducing the flow rate of the extinguishing gas, so that the generation of sound is effective. Suppressed. Thus, a large sound reduction effect can be achieved while miniaturizing the configuration.

  Each of the plurality of first and second silencers 113 and 108 is made of a porous material through which gas can flow, formed into a flat plate shape, and laminated and assembled. Therefore, depending on the flow rate of the extinguishing gas injected into the space in the extinguishing area, the pressure, and the degree to which the muffling is required, the desired characteristics of various kinds of gushing and muffling can be accurately determined by selecting the number of laminated sheets. It is easy to get it adjusted. In addition, it is sufficient to manufacture the first and second silencing members 113 and 108 having the same size and shape, mass production is easy, and productivity is improved.

  Supplementary Note 1 The invention is characterized in that a gap 115 is present between the end face of the first silencing material 113 facing the nozzle hole 104 and the end face of the ejection head 100 facing the first silencing material 113. I assume.

  Supplementary Note 1 According to the invention, since the gap 115 is provided between the end face of the first silencing material 113 facing the nozzle hole 104 and the end face of the ejection head facing the first silencing material 113, foreign matter Is stored in the gap 115, so that when the extinguishing gas is injected from the nozzle hole 104, clogging of the first and second silencers 113 and 108 by foreign matter is prevented, and noise due to clogging of foreign matter is generated. Generation and flow reduction are prevented. Foreign matter is present in the conduit 14 and, for example, welded scale and slag in the conduit 14, when the conduit 14 is a plated pipe, peeling pieces of the plated layer in the plated pipe, rust, and a sealing material used in the pipe joint And so on.

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

  According to the invention, since the peripheral surface 124 of the second silencer 108 is open to the atmosphere, the area for releasing the extinguishing gas is large, whereby the reduction in the flow rate of the extinguishing gas is suppressed, and the gas is released. The required flow rate and flow rate can be secured without increasing the flow path cross-sectional area, and the configuration is further miniaturized.

(Supplementary Note 1 Effects of the Invention)
According to the invention, since the noise reduction means 102 is provided to the jet head 100, it is possible to prevent generation of a loud jet noise even if a high pressure fire extinguishing gas is jetted from the jet head 100 at the time of fire occurrence. . Further, each of the plurality of first and second silencers 113 and 108 is made of a porous material through which gas can flow, and is formed into a flat plate shape, and is assembled by being stacked. Therefore, depending on the flow rate of the extinguishing gas injected into the space in the extinguishing area, the pressure, and the degree to which the muffling is required, the desired characteristics of various kinds of gushing and muffling can be accurately determined by selecting the number of laminated sheets. It is easy to get it adjusted. In addition, it is sufficient to manufacture the first and second silencing members 113 and 108 having the same size and shape, mass production is easy, and productivity is improved.

  Further, according to the invention, the gap 115 is provided between the end face of the first silencing material 113 facing the nozzle hole 104 and the end face of the ejection head 100 facing the second silencing material 108. When the fine foreign matter is stored and stored in the gap 115 and the extinguishing gas is jetted from the nozzle hole 104, clogging of the first and second silencing members 113 and 108 by the foreign matter is prevented and the foreign matter is clogged. As a result, it is possible to prevent the generation of noise due to the reduction of the flow rate due to clogging at the time of extinguishing gas injection.

  Further, according to the invention, since the circumferential surface 124 of the second silencer material 108 is open to the atmosphere, a reduction in the flow rate of the extinguishing gas is suppressed, and the flow passage cross-sectional area for gas release is not increased. The required flow rate and flow rate are ensured, and the injection of the extinguishing gas is not hindered by obstacles and the like, and thus the miniaturized configuration can prevent the generation of a large injection noise.

(Supplementary Note 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 suppression section in a building;
(B) a conduit 14 having an end portion 14a to which the injection head 200 is connected, and which leads high pressure extinguishing gas to the injection head 200;
(C) a extinguishing gas supply source 15 for supplying a high pressure extinguishing gas to the conduit 14;
(D) A gas extinguishing apparatus comprising: sound deadening means 202 provided in the jet head 200 for attenuating the sound due to the discharge of the fire extinguishing gas from the nozzle hole 204,
(E) The jet head 200 is
(E1) a jet head body 201 connected to the end 14a of the conduit 14;
(E2) the nozzle member 234,
(E2-1) a cylindrical portion 240 extending along the axis of the end 14 a of the conduit 14 and having an axial end connected to the jet head body 201;
(E2-2) a nozzle member 234 having a nozzle hole 204 formed in communication with the other axial end of the cylindrical portion 240 and having an end wall 241 closing the other axial end of the cylindrical portion 240;
(F) The silencing means 202 is
(F1) The sound deadening material 208 is formed in a flat plate shape, is made of a porous material through which gas can flow, and a plurality of sheets are laminated, and an end face 220 of one side of the sound deadening material 208 in the axial direction And a silencer material 208 disposed facing the jet head body 201;
(F2) a pressing member 228 for pressing the end face 225 on the other side in the axial direction of the sound deadening member 208,
(F3) A gas extinguishing system characterized by including a mounting member 227 for clamping and fixing the noise reduction material 208 between the jet head body 201 and the pressing member 228.

  According to the second aspect of the invention, the high pressure extinguishing gas supplied from the extinguishing gas supply source 15 to the conduit 14 is jetted toward the space in the building through the jet head 200. Such a jet head 200 is provided with a muffling means 202, so that it is possible to prevent the generation of a loud jet noise due to the jet flow of the extinguishing gas jetted from the nozzle holes 204 of the jet head 200 at high speed.

  The fire extinguishing gas flows from the conduit 14 into the sound deadening material 208 from the nozzle hole 204 of the injection head 200, passes through the fine gap of the sound deadening material 208, decompresses and expands, and jets into the space in the fire extinguishing section in the building. Be done.

  With regard to the large sound reduction effect by the small configuration, at the time of extinguishment, the high pressure fire extinguishing gas injected through the nozzle hole 204 is decompressed and expanded by passing through the fine air gap which the sound deadening material 208 has, thus The pressure is gradually reduced and expanded gradually without reducing the flow rate, and the generation of sound is effectively suppressed. Thus, a large sound reduction effect can be achieved while miniaturizing the configuration.

  The plurality of sound deadening members 208 are made of a porous material through which gas can flow, formed into a flat plate shape, and stacked and assembled. Therefore, depending on the flow rate of the extinguishing gas injected into the space in the extinguishing area, the pressure, and the degree to which the muffling is required, the desired characteristics of various kinds of gushing and muffling can be accurately determined by selecting the number of laminated sheets. It is easy to get it adjusted. Further, it is sufficient to manufacture the noise reduction material 208 having the same size and shape, mass production is easy, and productivity is improved.

  Appendix 2 is characterized in that a gap 215 is present between the end surface 220 of the sound deadening material 208 facing the nozzle hole 204 and the end surface 232 of the jet head main body 201 facing the noise deadening material 208. Do.

  According to the second aspect of the invention, since the gap 215 is provided between the end face of the silencer material 208 opposite to the nozzle hole 204 and the end face of the jet head opposite to the silencer material 208 When the fire extinguishing gas stored and stored is injected from the nozzle hole 204, clogging of the silencer material 208 by foreign matter is prevented, and generation of noise due to clogging of foreign matter and flow rate reduction are prevented. Foreign matter is present in the conduit 14 and, for example, welded scale and slag in the conduit 14, when the conduit 14 is a plated pipe, peeling pieces of the plated layer in the plated pipe, rust, and a sealing material used in the pipe joint And so on.

  Appendix 2 The invention is characterized in that the circumferential surface 224 of the laminated noise reduction material 208 is open to the atmosphere.

  According to the second aspect of the invention, since the circumferential surface 224 of the sound deadening material 208 is open to the atmosphere, the area for releasing the fire extinguishing gas is large, thereby suppressing the decrease in the flow rate of the fire extinguishing gas and providing a flow path for gas release. The required flow rate and flow rate can be secured without increasing the cross sectional area, and the configuration is further miniaturized.

(Appendix 2 Effects of the Invention)
According to the second aspect of the invention, since the muffling means 202 is provided in the jet head 200, it is possible to prevent generation of a large jet noise even if the high pressure fire extinguishing gas is jetted from the jet head 200 at the time of fire occurrence. . In addition, the plurality of sound deadening members 208 are made of a porous material through which gas can flow, formed into a flat plate shape, and stacked and assembled. Therefore, depending on the flow rate of the extinguishing gas injected into the space in the extinguishing area, the pressure, and the degree to which the muffling is required, the desired characteristics of various kinds of gushing and muffling can be accurately determined by selecting the number of laminated sheets. It is easy to get it adjusted. Further, it is sufficient to manufacture the noise reduction material 208 having the same size and shape, mass production is easy, and productivity is improved.

  Further, according to the second aspect of the invention, since the gap 215 is provided between the end face of the silencing material 208 facing the nozzle hole 204 and the end face of the ejection head facing the silencing material 208, fine foreign matter When stored and stored in the gap 215 and fire extinguishing gas is injected from the nozzle hole 204, clogging of the muffling material 208 with foreign matter is prevented, noise generation due to clogging of foreign matter is prevented, and fire extinguishing gas is injected It is possible to prevent the decrease in flow rate due to clogging at the time.

  Further, according to the second aspect of the invention, since the circumferential surface 224 of the noise reduction material 208 is opened to the atmosphere, a reduction in the flow rate of the extinguishing gas is suppressed, and the required cross sectional area for gas release is not increased. The flow rate and flow rate are secured, and the injection of the extinguishing gas is not hindered by obstacles and the like, and thus the miniaturized configuration can prevent the generation of a large injection noise.

(Supplementary Note 3 Invention)
Appendix 3 Invention is
(A) an injection head 300 having a nozzle hole 304 for injecting a high pressure fire extinguishing gas toward a space in a fire suppression section in a building;
(B) a conduit 314 having an end portion 303 to which the injection head 300 is connected, and which leads high pressure extinguishing gas to the injection head 300;
(C) a extinguishing gas source 315 for supplying high pressure extinguishing gas to the conduit 314;
(D) A gas extinguishing apparatus including a sound deadening means 302 provided in the injection head 300 for attenuating the sound due to the discharge of the fire extinguishing gas from the nozzle hole 304,
(E) The ejection head 300 is
(E1) The ejection head body 301,
A base 337 connected to the end 303 of the conduit 314;
An ejection head body 301 having an outward facing flange 338 connected to a base 337;
(E2) the nozzle member 339,
(E2-1) a cylindrical portion 340 extending along the axis L303 of the end portion 303 of the conduit 314, the peripheral wall 342 in which a plurality of nozzle holes 304 are formed, and one end of the peripheral wall 342 in the axial direction A tubular portion 340 having a proximal end 306 connected to the base 337 of the head body 301;
(E2-2) a nozzle member 339 having an end wall 341 closing the other axial end of the peripheral wall 342, and
(F) The silencing means 302
(F1) The muffling material 308, each of the muffling materials 308 is formed in a flat plate shape, is made of a porous material in which a plurality of sheets are stacked, and gas can flow, and the insertion hole 310 through which the cylindrical portion 340 is inserted. The end face 320 of one axial direction side (upper side in FIG. 19) of the silencer material 308 which is stacked is disposed on the outward flange 338 side of the jet head main body 301 and the circumferential surface 324 of the silencer material 308 laminated. And the sound absorbing material 308 which is open to the atmosphere,
(F2) a pressing member 328 for pressing the end face 325 of the other side (lower side in FIG. 19) of the stacked noise reduction members 308;
(F3) A gas extinguishing system characterized by including a mounting member 327 for clamping and fixing the noise absorbing member 308 between the outward flange 338 and the pressing member 328.

  According to the third aspect of the invention, the high pressure fire extinguishing gas supplied from the fire extinguishing gas supply source 315 to the conduit 314 is jetted toward the space in the building through the jet head 300. Such a jet head 300 is provided with a muffling means 302, so that it is possible to prevent the generation of loud jet noise due to the jet flow of the extinguishing gas jetted from the nozzle holes 304 of the jet head 300 at high speed.

  The extinguishing gas is decompressed and expanded from the conduit 314 through the nozzle hole 304 formed in the cylindrical portion 340 of the injection head 300, passing through the fine gap of the sound deadening material 308, and the space in the extinguishing target section in the building. To be injected.

  As for the large sound reduction effect by the small configuration, at the time of extinguishment, the high pressure fire extinguishing gas jetted through the nozzle hole 304 passes the fine air gap of the sound deadening material 308 to make the fine air gap of the noise deadening material 308 In this case, expansion and contraction are performed gradually, that is, smoothly and smoothly, and the generation of sound is reduced and suppressed. Thus, a large sound reduction effect can be achieved while miniaturizing the configuration. The circumferential surface 324 of the noise reduction material 308 is open to the atmosphere, so the configuration is further miniaturized.

  Each of the plurality of silencer materials 308 is made of a porous material through which gas can flow, and is formed into a flat plate shape, laminated, and assembled. Therefore, depending on the flow rate of the extinguishing gas injected into the space in the extinguishing area, the pressure, and the degree to which the muffling is required, the desired characteristics of various kinds of gushing and muffling can be accurately determined by selecting the number of laminated sheets. It is easy to get it adjusted. In addition, it is sufficient to manufacture the noise reduction material 308 having the same size and shape, mass production is easy, and productivity is improved.

  Appendix 3 The invention is characterized in that the mounting member 327 is constituted by a bolt, penetrates the pressing member 328 and the noise reduction member 308, is pierced in the outward flange 338, and is screwed to a screw. Do.

  According to the invention 3, according to the invention, the bolt which is the mounting member 327 is inserted into the pressing member 328 and the noise reduction material 308 and screwed to the female screw of the outward flange 338. In order to adjust the change of the pressure, it is only necessary to change the required length of the bolt, and it is sure that the almost entire surface of the circumferential surface 324 of the noise reduction material 308 is open to the atmosphere, and the structure is simplified. be able to.

  APPENDIX 3 The invention is characterized in that a gap is present between the inner peripheral surface of the insertion hole 310 of the noise reduction material 308 and the outer peripheral surface of the cylindrical portion 340 of the nozzle member 339.

  According to the third aspect of the invention, since the fine foreign matter is stored and stored in the gap, clogging of the nozzle hole 304 by the foreign matter is prevented when the extinguishing gas is injected from the nozzle hole 304, and the eyes of the foreign matter Noise generation and flow reduction due to clogging can be prevented. Foreign matter is present in the conduit 314 and, for example, welded scale and slag in the conduit 314, when the conduit 314 is a plated pipe, peeling pieces of the plated layer in the plated pipe, rust, and a sealing material used in the pipe joint And so on.

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

  According to the third aspect of the invention, the muffling effect is improved by the close contact between the inner peripheral surface of the insertion hole 310 of the noise reduction material 308 and the outlet end face of the nozzle hole 304 formed in the cylindrical portion 340 of the nozzle member 339. This has been confirmed by the inventor as described below in connection with FIGS. 20 and 21.

(Appendix 3 Effects of the Invention)
According to the third aspect of the invention, the jet head 300 is provided with the muffling means 302, so that even if the high pressure fire extinguishing gas is jetted from the nozzle member 339 of the jet head 300 when a fire occurs, a loud jet noise is generated and the flow rate is reduced. Can be prevented.

  Further, according to the invention 3 of the invention, since the circumferential surface 324 of the noise reduction material 308 is open to the atmosphere, the injection of the extinguishing gas is not hindered by obstacles and the like, and hence the large size injection Sound generation can be prevented.

  Each of the plurality of silencer materials 308 is made of a porous material through which gas can flow, and is formed into a flat plate shape, laminated, and assembled. Therefore, depending on the flow rate of the extinguishing gas injected into the space in the extinguishing area, the pressure, and the degree to which the muffling is required, the desired characteristics of various kinds of gushing and muffling can be accurately determined by selecting the number of laminated sheets. It is easy to get it adjusted. In addition, it is sufficient to manufacture the noise reduction material 308 having the same size and shape, mass production is easy, and productivity is improved.

(Supplementary Note 4 Invention)
Appendix 4 Invention is
(A) an injection head 400 having a nozzle hole 404 for injecting a high pressure fire extinguishing gas toward a space in a fire suppression section in a building;
(B) a conduit 14 having an end portion 14a to which the injection head 400 is connected, and which leads high pressure extinguishing gas to the injection head 400;
(C) a extinguishing gas supply source 15 for supplying a high pressure extinguishing gas to the conduit 14;
(D) A gas extinguishing system comprising: sound deadening means 402 provided in the injection head 400 for attenuating the sound due to the discharge of the fire extinguishing gas from the nozzle hole 404, wherein
(E) The jet head 400 is
(E1) a jet head body 401 connected to the end 14a of the conduit 14;
(E2) the nozzle member 409,
(E2-1) a cylindrical portion 440 extending along the axis of the end 14 a of the conduit 14 and having an axial end connected to the jet head body 401;
(E2-2) a nozzle member 409 having an end wall 441 which is continuous with the other axial end of the cylindrical portion 440 and in which the nozzle hole 404 is formed and which closes the other axial end of the cylindrical portion 440 f) The silencing means 402 is
(F1) The sound deadening material 408 is formed in a flat plate shape and made of a porous material through which gas can flow, and a plurality of sheets are stacked, and an end face 420 of one side of the sound deadening material 408 in the axial direction A silencer material 408 disposed facing the jet head body 401;
(F2) a pressing member 428 for pressing the end surface 425 on the other side in the axial direction of the sound deadening material 408 stacked;
(F3) a mounting member 427 for clamping and fixing the noise reduction material 408 between the jet head main body 401 and the pressing member 428;
(F4) A guide member having an annular attachment portion 422 disposed facing the ejection head main body 401, and a short cylindrical guide portion 423 which is continuous with the attachment portion 422 and covers the circumferential surface 424 of the silencer material laminated. And a gas extinguishing apparatus characterized by comprising:

  According to the fourth aspect of the invention, the high pressure extinguishing gas supplied from the extinguishing gas supply source 15 to the conduit 14 is jetted toward the space in the building through the jet head 400. Such a jet head 400 is provided with a muffling means 402, so that it is possible to prevent the generation of loud jet noise due to the jet flow of the extinguishing gas jetted from the nozzle holes 404 of the jet head 400 at high speed.

  The guide member 421 has an attachment portion 422 and a short cylindrical guide portion 423 which is connected to the attachment portion 422 and guides the extinguishing gas. The end surface 425 on the other side of the noise reduction material 408 is open to the atmosphere except for a portion in contact with the pressing member 428. The circumferential surface 424 of the sound deadening material 408 is surrounded by the guide portion 423 of the guide member 421. Therefore, the extinguishing gas flows from the conduit 14 through the jet head 400 and the nozzle hole 404 of the nozzle member 409 into the silencer material 408, passes through the fine gaps of the silencer material 408, and decompresses and expands. In a state where the emission from the circumferential surface 424 is suppressed by the guide portion 423, the fire extinguishing gas can be made to reach to a distance without being generated into a large sound without being injected into the space in the fire extinguishing target compartment in the building.

  With regard to the large sound reduction effect by the small configuration, at the time of extinguishment, the high pressure fire extinguishing gas injected through the nozzle hole 404 is decompressed and expanded by passing through the fine gap of the sound deadening material 408, thus The pressure is gradually reduced and expanded gradually without reducing the flow rate, and the generation of sound is effectively suppressed. Since it is not necessary to provide such a large sound attenuation space for sound attenuation, it is possible to achieve a large sound reduction effect while miniaturizing the configuration.

  The plurality of sound deadening materials 408 are made of porous materials through which gas can flow, and are formed into flat plates, stacked and assembled. Therefore, depending on the flow rate of the extinguishing gas injected into the space in the extinguishing area, the pressure, and the degree to which the muffling is required, the desired characteristics of various kinds of gushing and muffling can be accurately determined by selecting the number of laminated sheets. It is easy to get it adjusted. In addition, it is sufficient to manufacture the noise reduction material 408 having the same size and shape, mass production is easy, and productivity is improved.

  Appendix 4 is characterized in that a gap 415 is present between the end face of the noise elimination material 408 facing the nozzle hole 404 and the end face of the nozzle member 409 opposite to the noise elimination material 408.

  According to the fourth aspect of the invention, since the gap 415 is provided between the end surface of the muffling material 408 facing the nozzle hole 404 and the end surface of the nozzle member 409 facing the muffling material 408 When the fire extinguishing gas is injected from the nozzle holes 404, clogging of the sound deadening material 408 due to foreign matter is prevented, and generation of noise due to clogging of foreign matter and reduction in flow rate are prevented. Foreign matter is present in the conduit 14 and, for example, welded scale and slag in the conduit 14, when the conduit 14 is a plated pipe, peeling pieces of the plated layer in the plated pipe, rust, and a sealing material used in the pipe joint And so on.

  Appendix 4 The invention is characterized in that the guide member 421 further includes an annular expanded portion 443 which is continued to the other end side in the axial direction of the guide portion 423 and expanded in a truncated cone shape.

  According to the fourth aspect of the invention, since the guide member 421 has the expanded portion 443, immediately after the extinguishing gas released from the end face of the other end in the axial direction of the sound deadening material 408 is released, radially outward with respect to the axis of the injection head It is possible to suppress the diffusion and allow the extinguishing gas to reach far and release a required amount of extinguishing gas into the extinguishing target section.

(Appendix 4 Effects of the Invention)
According to the fourth aspect of the invention, since the muffling means 402 is provided in the jet head 400, it is possible to prevent generation of a large jet noise even if the high pressure fire extinguishing gas is jetted from the jet head 400 when a fire occurs. . In addition, the plurality of silencer materials 408 are made of a porous material through which gas can flow, formed in a flat plate shape, and stacked and assembled. Therefore, depending on the flow rate of the extinguishing gas injected into the space in the extinguishing area, the pressure, and the degree to which the muffling is required, the desired characteristics of various kinds of gushing and muffling can be accurately determined by selecting the number of laminated sheets. It is easy to get it adjusted. In addition, it is sufficient to manufacture the noise reduction material 408 having the same size and shape, mass production is easy, and productivity is improved.

  Further, according to the fourth aspect of the invention, since the gap 415 is provided between the end face of the silencing material 408 facing the nozzle hole 404 and the end face of the ejection head 400 facing the silencing material 408, fine foreign matter Is stored in the space 415 and the fire extinguishing gas is jetted from the nozzle hole 404, the clogging of the sound deadening material 408 due to foreign matter is prevented, and the generation of noise due to the clogging of foreign matter is prevented. It is possible to prevent a decrease in flow rate due to clogging at the time of gas injection.

  According to the fourth aspect of the invention, since the guide member 421 has the expanded portion 443, immediately after the extinguishing gas discharged from the end surface of the other end in the axial direction of the sound deadening material 408 is discharged, it is radially outward with respect to the axis of the jet head. It is possible to suppress the diffusion and allow the extinguishing gas to reach far and release a required amount of extinguishing gas into the extinguishing target section.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the above description but by the claims, and is intended to include all the modifications within the meaning and scope equivalent to the claims.

14 conduit, 15 fire extinguishing gas supply source, 18 branch pipe, 19 branch pipe, 20 base, 21 bracket, 22 fasteners, 23 main pipe, 100 injection head, 101 injection head body, 102 silencing means, 103 mounting auxiliary member, 104 Nozzle hole, 105 base, 106 outward flange, 108 second silencing member, 109 straightening member, 110 screw, 111 fire extinguishing gas injection part, 112 straightening hole, 113 first silencing member, 114 annular member, 121 guiding member, 122 mounting Section, 123 Guide Section, 124 Peripheral Surface, 128 Pressing Member, 131
Mounting seat, 137 base, 138 engagement portion, 200 injection head, 201 injection head main body, 202 muffling means, 204 nozzle hole, 205 base hole, 206 outward flange, 208 muffling material, 221 guide member, 222 attachment portion, 223 guide portion , 224 circumferential surface, 400 jet head, 401 jet head body, 402 silencer means, 403 mounting auxiliary member, 404 nozzle hole, 405 base, 406 outward flange, 407, 410 screw, 408 silencer material, 409 nozzle member, 415 gap , 420 end face, 421 guide member, 422 attachment portion, 423 guide portion, 424 circumferential surface, 425 end face, 427 attachment member, 428 pressing member, 431 attachment seat, 432 end face, 443 widening portion.

Claims (3)

A fire extinguishing gas injection device for injecting a high pressure fire extinguishing gas toward a space in a fire extinguishing section in a building,
An injection part provided with a nozzle hole, a muffling means for attenuating the sound due to the discharge of the extinguishing gas from the nozzle hole, an annular member interposed between the injection part and the muffling means and surrounding the nozzle hole Equipped with
The muffling means is composed of a plurality of porous materials, and the annular member is provided with a through hole penetrating in the axial direction of the nozzle hole, and the nozzle hole and the through hole are directly connected, extinguishing gas Injection device.   A gas extinguishing system comprising: the extinguishing gas injection device according to claim 1; and a extinguishing gas supply source for supplying extinguishing gas of high pressure to the extinguishing gas injection device. It is a construction method of the fire extinguishing gas injection device according to claim 1,
The installation method of the fire extinguishing gas injection apparatus which connects the fire extinguishing gas injection apparatus of Claim 1 so that attachment or detachment is possible with a screw | thread to the conduit | pipe connected to a fire extinguishing gas supply source.

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