Jet head with sound dampening means for gas-based fire extinguishing equipment

Abstract

To provide an injection head equipped with a sound-extinguishing means for a gas-based fire extinguishing system that can be used for a low-flow fire extinguishing system with an extended discharge time of the fire extinguishing gas or for a fire-extinguishing target compartment having a large floor area relative to its volume by improving the diffusion performance of the fire extinguishing gas without deteriorating the sound-extinguishing performance. The injection head 1A is equipped with a silencing means that is installed in a gas-based fire extinguishing system that uses extinguishing gas in order to discharge the extinguishing gas into a compartment to be extinguished, and the silencing means is configured with a silencing member 4 made of a porous material through which gas can flow that is disposed at the outlet portion of an orifice 31, and the silencing member 4 is equipped with an exposed portion 4A whose circumferential end face is open to the atmosphere, and a high-speed discharging portion 4B that discharges the extinguishing gas in a specific direction at a speed faster than the discharge speed of the extinguishing gas from the exposed portion 4A, and the exposed portion 4A and the high-speed discharging portion 4B are partitioned.

Description

[Technical field]

[0001] The present invention relates to an injection head installed in a gas-based fire extinguishing system that uses extinguishing gas such as nitrogen, carbon dioxide, or a fluorine compound in order to discharge the extinguishing gas into a target compartment for extinguishing a fire, and in particular to an injection head equipped with soundproofing means for a gas-based fire extinguishing system that is capable of reducing noise generated when the extinguishing gas is discharged. [Background technology]

[0002] In a gas-based fire extinguishing system that uses extinguishing gases such as nitrogen, carbon dioxide, or fluorine compounds, when the gas-based fire extinguishing system is activated to extinguish a fire, the extinguishing gas is released so that the extinguishing gas concentration in the compartment to be extinguished reaches the extinguishing concentration within a specified time.

[0003] At this time, the extinguishing gas is discharged from a jet head installed on a ceiling or wall surface to discharge the extinguishing gas into the compartment to be extinguished. The jet head for the gas-based fire extinguishing system may be, as shown in FIG. 13(a), a jet head 10A connected to a pipe through which the extinguishing gas is supplied, which has an orifice 20 at the outlet thereof, and the extinguishing gas is discharged directly from the orifice 20 into the compartment to be extinguished. Alternatively, as shown in FIG. 13(b), a jet head 10B connected to a pipe through which the extinguishing gas is supplied has an orifice 20 at the outlet thereof. and a conical deflector (deflection member) 50, in which the extinguishing agent gas discharged from the orifice 20 is deflected by the deflector (deflection member) 50 and discharged into the compartment to be extinguished; and further, as shown in Figure 13(c), a nozzle is provided at the outlet portion of the injection head 10C with an orifice (not shown) and a conical horn (diffusion member) 60, in which the extinguishing agent gas discharged from the orifice is diffused by the horn (diffusion member) 60 and discharged into the compartment to be extinguished.

[0004] As described above, the above-mentioned conventional gas-based fire extinguishing system jet heads 10A, 10B, and 10C are designed to restrict the flow rate of the extinguishing gas discharged from the jet head by the orifice 20 so that the same amount of extinguishing gas is discharged from each of the jet heads, of which a plurality are usually installed in the compartment to be extinguished. However, it has been known that this causes high-level noise (specifically, noise of 120 db or more) when the extinguishing gas is discharged from the jet head.

[0005] Incidentally, when gas-based fire extinguishing equipment is activated, it is assumed that no one is present in the area to be extinguished. Therefore, noise (vibration) generated when extinguishing gas is released from the injection head has not been considered a problem at all, and no measures have been taken to address it.

[0006] However, based on the knowledge of how to deal with cases where there are people in the target area who are unable to escape when the gas-based fire extinguishing equipment is activated, that the noise generated when the extinguishing gas is released from the spray head may have an adverse effect on people in the vicinity, and further that noise (vibration) can cause failures in precision equipment such as information and communication devices, the applicant of the present application has previously proposed technology for reducing the noise generated when the extinguishing gas is released (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2011-125673 A [Patent Document 2] JP 2013-169333 A Summary of the Invention [Problem to be solved by the invention]

[0008] The injection head equipped with silencing means for gas-based fire extinguishing equipment proposed by the applicant above is equipped with a block-shaped silencing member made of a porous material through which gas can flow, which is disposed at the outlet of the orifice, as the silencing means, and thereby it is possible to increase the noise reduction rate even with a small injection head.

[0009] However, in a spray head equipped with a sound-absorbing means, the flow velocity of the extinguishing gas when sprayed is reduced due to the porous material used as the sound-absorbing means, and therefore the diffusion performance of the extinguishing gas tends to be lower than that of a spray head without a sound-absorbing function. There is a trade-off between increasing the sound deadening performance and decreasing the diffusion performance of the extinguishing gas, and maintaining the diffusion performance results in low sound deadening performance. Furthermore, in recent years, fire extinguishing equipment that extends the duration of extinguishing gas discharge has appeared, and in this case, the flow rate of extinguishing gas can be reduced compared to normal, which has the advantage of reducing the area of ​​the pressure relief port and the diameter of the pipe, but the problem of reduced diffusion performance due to the reduced flow rate of extinguishing gas is a problem. This problem is particularly serious when the target compartment for extinguishing fire is an underfloor compartment, which has a large floor area relative to its volume. Here, the underfloor compartment can be, for example, an underfloor compartment in a server room as shown in FIG. 14, and refers to a compartment that is smaller in height H than a general target compartment, for example, about 300 mm.

[0010] In view of the problems associated with the above-mentioned injection head equipped with silencing means for gas-based fire extinguishing equipment, the present invention aims to provide an injection head equipped with silencing means for gas-based fire extinguishing equipment that can be used for low-flow fire extinguishing equipment with an extended extinguishing gas spray time and for extinguishing compartments with a large floor area relative to their volume, by improving the diffusion performance of the extinguishing gas without reducing the silencing performance. [Means for solving the problem]

[0011] In order to achieve the above-mentioned object, the injection head with silencing means for gas-based fire extinguishing equipment of the present invention is an injection head with silencing means that is installed in a gas-based fire extinguishing equipment that uses extinguishing gas in order to discharge the extinguishing gas into a compartment to be extinguished, characterized in that the silencing means is composed of a silencing member made of a porous material through which gas can flow and arranged at the outlet portion of an orifice, the silencing member has an exposed portion whose circumferential end face is open to the atmosphere, and a high-speed discharging portion that discharges the extinguishing gas in a specific direction at a speed faster than the discharge speed of the extinguishing gas from the exposed portion, and the exposed portion and the high-speed discharging portion are partitioned.

[0012] In this case, the discharge direction of the extinguishing gas discharged from the exposed portion and the discharge direction of the extinguishing gas discharged from the high-speed discharge portion can be approximately parallel, can form a specified acute angle, or can form an angle of approximately 90°.

[0013] The sound deadening member constituting the exposed portion may be formed in a cylindrical, columnar or polygonal shape, or in a shape that bulges outward from other portions.

[0014] Also, the pore size of the pores in the porous material constituting the sound deadening member can be made smaller in the direction in which the gas flows.

[0015] The high-speed ejection portion may be in contact with a through hole formed in the peripheral surface of the ejection head body. The high-speed ejection portions may be formed at equal angular intervals on the circumferential surface of the ejection head body.

[0016] The exposed portion may also be disposed between the high speed emission portions.

[0017] Further, with respect to the direction in which the extinguishing agent gas flows into the injection head, the exposed portion can be disposed on the upstream side, and the high-speed releasing portion can be disposed on the downstream side.

[0018] Also, the distance from the center of the injection head to the discharge surface of the exposed portion from which the extinguishing gas is discharged can be made greater than the distance from the center of the injection head to the discharge surface of the high-velocity discharge portion from which the extinguishing gas is discharged.

[0019] In addition, a diffusion portion for uniformly diffusing the extinguishing gas that has passed through the orifice may be provided between the orifice and the exposed portion and the high-speed discharging portion. Effect of the Invention

[0020] According to the injection head equipped with silencing means for a gas-based fire extinguishing system of the present invention, by improving the diffusion performance of the extinguishing agent gas without reducing the silencing performance, it is possible to provide an injection head equipped with silencing means for a gas-based fire extinguishing system that can be used for a low-flow fire extinguishing system with an extended discharge time of the extinguishing agent gas or for a compartment to be extinguished that has a large floor area relative to its volume. [Brief description of the drawings]

[0021] [Figure 1] 1 is an external perspective view showing a first embodiment of an injection head equipped with sound silencing means for a gas-based fire extinguishing system of the present invention. FIG. [Diagram 2] FIG. 2 is a cross-sectional view of the ejection head. [Diagram 3] FIG. 4 is a cross-sectional view showing a second embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. [Figure 4] FIG. 11 is an external perspective view showing a third embodiment of an injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. [Diagram 5] FIG. 2 is a cross-sectional view of the ejection head. [Figure 6] FIG. 11 is an external perspective view showing a fourth embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system of the present invention. [Figure 7] FIG. 13 is an external perspective view showing a fifth embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system of the present invention. [Figure 8] 8 is a cross-sectional view of the ejection head shown in FIG. 7A. [Figure 9] 8 is a cross-sectional view of the ejection head according to the reference symbol B in FIG. 7. [Figure 10] FIG. 13 is an external perspective view showing a sixth embodiment of an injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. [Figure 11] FIG. 2 is a cross-sectional view of the ejection head. [Figure 12] FIG. 13 is a cross-sectional view showing a seventh embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. [Figure 13] FIG. 1 is an explanatory diagram showing a conventional injection head for a gas-based fire extinguishing system. [Figure 14] FIG. 1 is a schematic diagram showing a server room. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a jet head equipped with a silencing means for a gas-based fire extinguishing system according to the present invention will be described with reference to the drawings.

[0023] 1 and 2 show a first embodiment of a jet head equipped with a silencing means for a gas-based fire extinguishing system according to the present invention. This injection head 1A with silencing means for gas-based fire extinguishing equipment is an injection head with silencing means that is installed in a gas-based fire extinguishing equipment that uses extinguishing gas to release the extinguishing gas into a compartment to be extinguished, and the silencing means is composed of a silencing member 4 made of a porous material through which gas can flow, which is arranged at the outlet portion of the orifice 31, and the silencing member 4 has an exposed portion 4A whose circumferential end face is open to the atmosphere, and a high-speed release portion 4B that releases the extinguishing gas in a specific direction faster than the release speed of the extinguishing gas from the exposed portion 4A, so that the exposed portion 4A and the high-speed release portion 4B are partitioned.

[0024] The injection head 1A is attached to the ceiling surface (underside of floor F) of the underfloor section of the server room, as shown in FIG. 14, for example, and is composed of an injection head main body 2 connected to a pipe (not shown) through which extinguishing agent gas is supplied, an orifice plate 3 having an orifice 31 formed therein and detachably arranged on the injection head main body 2, and a block-shaped sound-absorbing member 4 made of a porous material through which gas can flow and arranged at the outlet of the orifice 31.

[0025] The injection head main body 2 has a circular cross section and is made up of an upper structure 2A that forms a connection portion with a pipe, and a lower structure 2B that is attached by screwing to the upper structure 2A.

[0026] The orifice plate 3 having the orifices 31 formed therein is arranged on the injection head body 2 so as to be detachable from the opening on the connection side of the piping, so that the orifice plate 3 having multiple types of orifices 31 formed therein can be selected according to conditions such as the installation location.

[0027] Moreover, it is preferable that the large diameter portion of the orifice 31 faces the sound deadening member 4 . This allows the extinguishing gas to flow evenly from the center to the periphery of the sound-proofing material 4, which in turn makes it possible to uniformly distribute the noise generated at the point where the extinguishing gas is released, thereby further increasing the noise reduction rate.

[0028] The block-shaped sound-absorbing member 4 made of a porous material may be constructed as an integral structure, or as shown in this embodiment, as a divided structure consisting of a first member 41, a second member 42, and a third member 43 covering the upper outer periphery of the second member 42.

[0029] A diffusion section 5 is provided between the first member 41 and the second member 42 for uniformly diffusing the extinguishing agent gas that has passed through the orifice 31 and flowed into the first member 41 toward the second member 42. This diffusion section 5 has a cylindrical shape with a large number of through holes (orifices) formed on its peripheral surface, and in this embodiment, it is constructed integrally with the upper structure 2A of the ejection head main body 2, but it can also be constructed as a separate member from the ejection head main body 2.

[0030] The porous material constituting the sound deadening member 4 can be suitably a porous structure having a three-dimensional network structure made of an inorganic material (metal, metal oxide, metal hydroxide, etc.) with high shape retention properties.

[0031] The pore size of the voids in the porous material constituting the soundproofing member 4 can be changed in the direction of gas flow, or more specifically, can be made smaller in the direction of gas flow, and for example, in this embodiment, the pores in the third member 43 can be made of a material having a smaller pore size than the pores in the first member 41 and the second member 42. In this way, by reducing the pore size of the porous material constituting the sound deadening member 4 in the direction in which the gas flows, the noise reduction rate can be further increased.

[0032] Whether the sound-absorbing member 4 has an integral structure or a divided structure, one end face of the sound-absorbing member 4 is disposed in contact with the ejection head main body 2 (which may include the orifice plate 3 in this embodiment), and the outer peripheral surface of the sound-absorbing member 4, specifically, the outer peripheral surface of the third member 43 and a portion of the outer peripheral surface of the lower part of the second member 42, are open to the atmosphere. The outer peripheral surface of the third member 43 constitutes an exposed portion 4A whose circumferential end face is open to the atmosphere. In addition, a portion of the outer peripheral surface of the lower part of the second member 42 contacts through holes 21 formed at multiple locations (in this embodiment, four locations at 90° intervals) on the peripheral surface of the lower structure 2B of the injection head main body 2, thereby forming a high-speed release portion 4B that releases extinguishing agent gas in a specific direction at a speed faster than the release speed of the extinguishing agent gas from the exposed portion 4A. In other words, the extinguishing gas passes through the orifice 31 from the exposed portion 4A formed by the outer peripheral surface of the third member 43 and flows into the first member 41, passes through the diffusion portion 5, and flows into the second member 42 and the third member 43 covering the upper outer peripheral portion of the second member 42, and is released at a sufficiently decelerated state, thereby ensuring the sound-dampening performance of the injection head 1A. On the other hand, the extinguishing gas that passes through the orifice 31 and flows into the first member 41 from the high-speed release section 4B formed by the outer peripheral surface in contact with the through hole 21 of the injection head body 2 at the lower part of the second member 42 further passes through the diffusion section 5 and flows into the lower part of the second member 42, and is released while maintaining the required flow rate, thereby improving the diffusion performance of the extinguishing gas. Here, the through hole 21 is formed as a circular hole having a diameter of, for example, about 10 mm or more, and has a cross-sectional area of ​​about the same (about 80 mm 2 The aperture may be an oval or slit-shaped hole having a cross-sectional area of ​​100 mm or more. The balance between the diffusibility of the extinguishing agent gas and the sound pressure reduction effect can be adjusted by changing the exposed area ratio between the exposed portion 4A formed by the outer peripheral surface of the third member 43 and the high-speed release portion 4B formed by the outer peripheral surface in contact with the through-hole 21 of the jet head body 2 at the bottom of the second member 42. For example, when the flow rate is large with a large-diameter jet head, the sound pressure can be efficiently reduced by making the exposed portion 4A larger (lengthening the axial dimension). In this embodiment, the outer peripheral surface of the lower part of the second member 42 is in contact with the through hole 21 to form the high-speed release section 4B, but in order to improve the sound-absorbing performance, a sound-absorbing member (not shown) that covers the outer peripheral part of the lower part of the second member 42 and is thinner than the third member 43 can be provided between the second member 42 and the lower structure 2B of the injection head main body 2, within the range in which the required flow rate is maintained. In addition, in this embodiment, the through holes 21 that constitute the high-speed release section 4B are formed in four locations at 90° intervals (equidistant intervals) so that the extinguishing agent gas is diffused into the fire-extinguishing target compartment, which has a rectangular planar shape. However, depending on the shape of the fire-extinguishing target compartment and the installation form of the injection head, the through holes 21 that constitute the high-speed release section 4B can be formed in eight locations at 45° intervals, six locations at 60° intervals, three locations at 120° intervals, or two locations at 180° intervals. Also, the through holes 21 constituting the high speed release portion 4B may be formed unevenly so that the extinguishing agent gas is diffused only in a specific direction.

[0033] This improves the diffusion performance of the extinguishing gas without compromising soundproofing performance, making it possible to accommodate low-flow fire extinguishing equipment with extended extinguishing gas spray time and fire extinguishing compartments with a large floor area relative to their volume.

[0034] FIG. 3 shows a second embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. The injection head 1B equipped with the silencing means for the gas-based fire extinguishing system omits the orifice plate 3 and the first member 41 of the silencing member 4 of the injection head 1A of the first embodiment shown in Figs. 1 and 2, and the through holes 21 formed in the lower structure 2B of the injection head main body 2 are formed so that the discharge direction of the extinguishing agent gas from the through holes 21 is slightly (about 5 to 30°, about 10° in this embodiment) downward from the horizontal direction of the injection head 1A of the first embodiment. In this case, a large number of through holes formed on the peripheral surface of the diffusion portion 5 serve as orifices. Here, the angle of the discharge direction of the extinguishing gas from the through hole 21 formed in the lower structure 2B of the injection head main body 2 is not limited to the above angle, and depending on conditions such as the installation location of the injection head, the discharge direction of the extinguishing gas discharged from the exposed portion 4A and the discharge direction of the extinguishing gas discharged from the high-speed discharging portion 4B can form a predetermined angle of any angle (acute angle) between 0 and 90°. In addition, the discharge direction of the extinguishing agent gas from the through hole 21 formed in the lower structure 2B of the injection head main body 2 can be horizontal or downward, or can be upward from the horizontal, for example, at an angle of about 5 to 30° upward, depending on the shape of the compartment to be extinguished and the installation position of the injection head, etc.

[0035] Other configurations and operations of the ejection head 1B of this embodiment are similar to those of the ejection head 1A of the first embodiment.

[0036] 4 and 5 show a third embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. The injection head 1C equipped with the silencing means for the gas-based fire extinguishing system is configured with a silencing member 40 formed by integrating the first member 41 and the second member 42 of the silencing member 4 of the injection head 1A of the first embodiment shown in Figs. 1 and 2, omits the diffusion section 5, and forms the through holes 21 in the lower structure 2B of the injection head main body 2 so that the discharge direction of the extinguishing agent gas from the through holes 21 is slightly (approximately 5 to 30°, in this embodiment, approximately 10°) downward from the horizontal direction of the injection head 1A of the first embodiment.

[0037] The injection head main body 2 has a circular cross section and is made up of an upper structure 2A that forms a connection portion with a pipe, and a lower structure 2B that is attached to the upper structure 2A by a screw member.

[0038] Other configurations and operations of the ejection head 1C of this embodiment are similar to those of the ejection head 1A of the first embodiment.

[0039] FIG. 6 shows a fourth embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. The injection head 1D equipped with soundproofing means for a gas-based fire extinguishing system has through holes 22 having a smaller diameter than the through holes 21 (having a diameter of about 1 / 3 to 1 / 5 of the diameter of the through holes 21) formed alternately with the through holes 21 at a plurality of locations (four locations at 90° intervals in this embodiment) on the peripheral surface of the lower structure 2B of the injection head body 2 of the injection head 1C of the third embodiment shown in Figs. 3 to 5. Furthermore, a portion of the outer peripheral surface of the lower part of the sound-absorbing member 40 of the sound-absorbing member 4 constitutes the second exposed portion and comes into contact with the through-hole 22 having a smaller diameter than the through-hole 21, so that the extinguishing agent gas is released from the through-hole 22 at a sufficiently reduced speed, thereby ensuring the sound-absorbing performance of the injection head 1D.

[0040] Other configurations and operations of the ejection head 1D of this embodiment are similar to those of the ejection head 1C of the third embodiment.

[0041] 7 to 9 show a fifth embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. The injection head 1E equipped with a silencing means for this gas-based fire extinguishing system is configured by integrating the first member 41 and the second member 42 of the silencing member 4 of the injection head 1A of the first embodiment shown in Figures 1 and 2, and then dividing it into silencing members 40a, 40b in the vertical direction, with the third member 43 sandwiched between them, thereby omitting the diffusion section 5.

[0042] The injection head main body 2 has a cross-sectional shape of a regular polygon (regular octagon) and is composed of an upper structure 2A that forms a connection part with the piping, and a lower structure 2B that is attached to the upper structure 2A by screw members, with a third member 43 sandwiched between them.

[0043] The orifice plate 3 in which the orifices 31 are formed is arranged so as to be detachable from the ejection head body 2, so that the orifice plate 3 in which multiple types of orifices 31 are formed can be selected according to conditions such as the installation location.

[0044] The pore size of the voids in the porous material constituting the sound deadening member 4 is such that the entire member is made of a homogeneous material, and in this embodiment, the pore size of the voids in the third member 43 is smaller than the pore size of the voids in the sound deadening members 40a, 40b. In this manner, by forming the third member 43 from a material having voids with a small diameter, the noise reduction rate can be further increased.

[0045] Whether the sound-absorbing member 4 has an integral structure or a divided structure, one end face of the sound-absorbing member 4 is disposed in contact with the ejection head main body 2 (which may include the orifice plate 3 in this embodiment), and the outer peripheral surface of the sound-absorbing member 4, specifically, the outer peripheral surface of the third member 43 and a portion of the outer peripheral surface of the sound-absorbing member 40b, are open to the atmosphere. The outer peripheral surface of the third member 43 constitutes an exposed portion 4A whose circumferential end face is open to the atmosphere. In addition, a portion of the outer peripheral surface of the sound-absorbing member 40b contacts the through holes 21 formed at multiple locations (in this embodiment, four locations at 90° intervals) on the outer peripheral surface of the lower structure 2B of the injection head main body 2, thereby forming a high-speed release portion 4B that releases the extinguishing agent gas in a specific direction at a speed faster than the release speed of the extinguishing agent gas from the exposed portion 4A. In other words, from the exposed portion 4A formed by the outer peripheral surface of the third member 43, the extinguishing gas passes through the orifice 31 and flows into the sound-absorbing member 40a, and then flows further into the third member 43 and is released at a sufficiently decelerated state, thereby ensuring the sound-absorbing performance of the injection head 1A. On the other hand, from the high-speed release section 4B formed by the outer peripheral surface of the sound-absorbing member 40b in contact with the through-hole 21 of the injection head body 2, the extinguishing gas that has passed through the orifice 31 and flowed into the sound-absorbing member 40a further passes through the third member 43 and flows into the sound-absorbing member 40b, and is released while maintaining the required flow rate, thereby improving the diffusion performance of the extinguishing gas. Here, the through holes 21 are four in one location, and the total cross-sectional area of ​​the four through holes 21 is about 80 mm 2 or more.

[0046] Other configurations and operations of the ejection head 1E of this embodiment are similar to those of the ejection head 1A of the first embodiment.

[0047] 10 and 11 show a sixth embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. This injection head 1F with silencing means for gas-based fire extinguishing equipment is an injection head with silencing means that is installed in a gas-based fire extinguishing equipment that uses extinguishing gas to release the extinguishing gas into a compartment to be extinguished, and the silencing means is composed of a silencing member 4 made of a porous material through which gas can flow, which is arranged at the outlet portion of the orifice 31, and the silencing member 4 has an exposed portion 4A whose circumferential end face is open to the atmosphere, and a high-speed release portion 4B that releases the extinguishing gas in a specific direction faster than the release speed of the extinguishing gas from the exposed portion 4A, so that the exposed portion 4A and the high-speed release portion 4B are partitioned.

[0048] The block-shaped sound-absorbing member 4 made of a porous material may be constructed as an integral structure, or as shown in this embodiment, as a divided structure consisting of a first member 41, a second member 42, and a third member 43 covering the upper outer periphery of the second member 42. Here, the first member 41 can be formed into a cylindrical shape, or a shape whose cross-sectional area expands in the direction in which the gas flows (frustum of a cone) as shown in this embodiment.

[0049] A diffusion section 5 is provided between the first member 41 and the second member 42 for uniformly diffusing the extinguishing agent gas that has passed through the orifice 31 and flowed into the first member 41 toward the second member 42. The diffusion portion 5 has a disk shape with a plurality of through holes (orifices) formed therein, and in this embodiment, is disposed in the upper structure 2A of the ejection head main body 2 by being screwed thereto.

[0050] Whether the sound-absorbing member 4 has an integral structure or a divided structure, one end face of the sound-absorbing member 4 is disposed in contact with the ejection head main body 2 (which may include the orifice plate 3 in this embodiment), and the outer peripheral surface of the sound-absorbing member 4, specifically, the outer peripheral surface of the third member 43 and a portion of the outer peripheral surface of the lower part of the second member 42, are open to the atmosphere. The outer peripheral surface of the third member 43 constitutes an exposed portion 4A whose circumferential end face is open to the atmosphere. In addition, a portion of the outer peripheral surface of the lower part of the second member 42 contacts through holes 21 formed at multiple locations (in this embodiment, four locations at 90° intervals) on the peripheral surface of the lower structure 2B of the injection head main body 2, thereby forming a high-speed release portion 4B that releases extinguishing agent gas in a specific direction at a speed faster than the release speed of the extinguishing agent gas from the exposed portion 4A. In other words, the extinguishing gas passes through the orifice 31 from the exposed portion 4A formed by the outer peripheral surface of the third member 43 and flows into the first member 41, passes through the diffusion portion 5, and flows into the second member 42 and the third member 43 covering the upper outer peripheral portion of the second member 42, and is released at a sufficiently decelerated state, thereby ensuring the sound-dampening performance of the injection head 1A. On the other hand, the extinguishing gas that passes through the orifice 31 and flows into the first member 41 from the high-speed release section 4B formed by the outer peripheral surface in contact with the through hole 21 of the injection head body 2 at the lower part of the second member 42 further passes through the diffusion section 5 and flows into the lower part of the second member 42, and is released while maintaining the required flow rate, thereby improving the diffusion performance of the extinguishing gas. Furthermore, by making the distance from the center of the injection head 1F to the extinguishing gas discharge surface of the exposed portion 4A greater than the distance to the extinguishing gas discharge surface of the high-speed discharge portion 4B, the sound deadening performance can be further improved.

[0051] Incidentally, all of the above-mentioned injection heads 1A to 1F are intended to be attached to the ceiling surface (underside of floor F) of the underfloor compartment of a server room, for example, as shown in FIG. 14, and the emission direction of the extinguishing gas emitted from the exposed portion 4A and the emission direction of the extinguishing gas emitted from the high-velocity emission portion 4B are made to be approximately parallel or to form a predetermined acute angle. For example, FIG. 12 shows a seventh embodiment of an injection head equipped with sound absorbing means for a gas-based fire extinguishing system of the present invention, when attached to the wall W of the underfloor compartment of a server room, as shown in FIG. 14.

[0052] The injection head 1G equipped with the silencing means for this gas-based fire extinguishing system is configured with a silencing member 40 formed by integrating the first member 41 and the second member 42 of the silencing member 4 of the injection head 1A of the first embodiment shown in Figures 1 and 2, omits the diffusion section 5, and the discharge direction of the extinguishing gas from the through hole 21 formed in the lower structure 2B of the injection head main body 2 is configured so that the discharge direction of the extinguishing gas discharged from the exposed portion 4A and the discharge direction of the extinguishing gas discharged from the high-speed discharging portion 4B form an angle of approximately 90° with respect to the horizontal direction of the injection head 1A of the first embodiment (while the discharge direction of the extinguishing gas discharged from the exposed portion 4A and the discharge direction of the extinguishing gas discharged from the high-speed discharging portion 4B are approximately parallel).

[0053] Whether the sound-absorbing member 4 has an integral structure or a divided structure, one end face of the sound-absorbing member 4 is disposed in contact with the ejection head main body 2 (which may include the orifice plate 3 in this embodiment), and the outer peripheral surface of the sound-absorbing member 4, specifically, the outer peripheral surface of the third member 43 and a portion of the other end face of the sound-absorbing member 40, are open to the atmosphere. The outer peripheral surface of the third member 43 constitutes an exposed portion 4A whose circumferential end face is open to the atmosphere. In addition, a portion of the other end face of the sound-absorbing member 40 comes into contact with through holes 21 formed at multiple locations (four locations at 90° intervals in this embodiment) on the underside of the lower structure 2B of the injection head main body 2 (which becomes a vertical surface when attached to the wall W of the underfloor compartment of the server room), thereby forming a high-speed release portion 4B that releases extinguishing gas in a specific direction at a speed faster than the release speed of the extinguishing gas from the exposed portion 4A. In other words, the extinguishing gas that passes through the orifice 31 and flows into the sound-absorbing member 40 from the exposed portion 4A formed by the outer peripheral surface of the third member 43 further flows into the third member 43 that covers the upper outer peripheral portion of the sound-absorbing member 40 and is released at a sufficiently decelerated state, thereby ensuring the sound-absorbing performance of the injection head 1A. On the other hand, the extinguishing gas that has passed through the orifice 31 and flowed into the sound-absorbing member 40 is released from the high-speed release section 4B formed by the other end face of the sound-absorbing member 40 that is in contact with the through-hole 21 of the injection head body 2 while maintaining the required flow rate, thereby improving the diffusion performance of the extinguishing gas.

[0054] The above describes the injection head equipped with silencing means for gas-based fire extinguishing equipment of the present invention based on its embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and the configuration can be changed as appropriate within the scope of the spirit of the present invention, such as by appropriately combining the configurations described in each embodiment. [Industrial Applicability]

[0055] The injection head equipped with a soundproofing means for a gas-based fire extinguishing system of the present invention improves the diffusion performance of the extinguishing gas without reducing soundproofing performance, and can be used for low-flow fire extinguishing systems with extended extinguishing gas spray time and fire extinguishing target compartments with a large floor area relative to their volume, etc., and can therefore be suitably used for gas-based fire extinguishing systems that use extinguishing gases such as nitrogen, carbon dioxide, and fluorine compounds and are installed in compartments with a large floor area relative to their volume, such as under-floor compartments.In addition, since the protection range can be expanded without increasing the number of injection heads installed, the injection head can also be widely used for gas-based fire extinguishing systems installed in general fire extinguishing target compartments, and the application is not limited to newly installed gas-based fire extinguishing systems, and can also be applied to existing gas-based fire extinguishing systems by simply replacing the injection head. [Explanation of symbols]

[0056] 1A~1G Injection head 2. Injection head body 2A Superstructure 2B Lower structure 3 Orifice plate 31 Orifice 4. Sound-absorbing materials 4A Exposed part 4B High speed discharge part 5 Diffusion section

Claims

1. A gas-based fire extinguishing system that uses a fire extinguishing gas, comprising: a jet head that is installed to discharge a fire extinguishing gas into a target compartment for extinguishing; an ejection head body connected to a pipe and having an orifice near a tip of the pipe; a sound-deadening member made of a porous material through which the extinguishing agent gas can flow and disposed coaxially with the ejection head body downstream of the orifice in the ejection head body; Equipped with the sound deadening member includes an exposed portion which is a portion of a radially outer peripheral surface of the sound deadening member that is open to the atmosphere, and a high-speed release portion which releases the extinguishing agent gas in a specific direction at a speed faster than the release speed of the extinguishing agent gas in the exposed portion, The exposed portion and the high-speed release portion are separated by a partition so that the boundaries between them do not contact each other. A jet head equipped with sound silencing means for a gas-based fire extinguishing system.

2. 2. The injection head with silencing means for a gas-based fire extinguishing system as described in claim 1, characterized in that the direction of the extinguishing gas discharged from the exposed portion and the direction of the extinguishing gas discharged from the high-velocity discharge portion are approximately parallel to each other.

3. 2. The injection head with silencing means for a gas-based fire extinguishing system as described in claim 1, characterized in that the direction of the extinguishing gas discharged from the exposed portion and the direction of the extinguishing gas discharged from the high-velocity discharge portion form a predetermined acute angle.

4. 2. The injection head with soundproofing means for a gas-based fire extinguishing system as described in claim 1, characterized in that the direction of the extinguishing gas discharged from the exposed portion and the direction of the extinguishing gas discharged from the high-velocity discharge portion form an angle of approximately 90 degrees.

5. 2. The injection head with silencing means for a gas-based fire extinguishing system according to claim 1, wherein the silencing member constituting the exposed portion is formed in a cylindrical, columnar or polygonal shape.

6. The pore size of the pores in the porous material constituting the sound deadening member is made smaller in the direction in which the gas flows.

2. A jet head equipped with sound silencing means for a gas-based fire extinguishing system according to claim 1.

7. 2. The injection head with sound absorbing means for a gas-based fire extinguishing system according to claim 1, wherein the high-speed ejection portion is in contact with a through hole formed in the peripheral surface of the injection head body.

8. The injection head equipped with soundproofing means for a gas-based fire extinguishing system as described in claim 7, characterized in that the through holes formed on the peripheral surface of the injection head body include those with small diameters and those with large diameters, and the small diameter through holes and the large diameter through holes are alternately arranged along the circumferential direction of the injection head body.

9. 2. The injection head with soundproofing means for a gas-based fire extinguishing system according to claim 1, characterized in that an exposed portion is arranged on the upstream side and a high-speed release portion is arranged on the downstream side with respect to the direction in which the extinguishing agent gas flows into the injection head.

10. A spray head equipped with a silencing means for a gas-based fire extinguishing system as described in claim 1, characterized in that the distance from the central axis of the spray head to the discharge surface of the extinguishing gas of the exposed portion is greater than the distance to the discharge surface of the extinguishing gas of the high-velocity discharge portion.

11. 2. The injection head with sound-proofing means for a gas-based fire extinguishing system as described in claim 1, characterized in that a diffusion section is provided between the orifice and the exposed section and the high-speed release section, and the extinguishing agent gas passing through the orifice is uniformly diffused to a sound-proofing member arranged downstream of the diffusion section.

12. 2. The injection head with soundproofing means for a gas-based fire extinguishing system according to claim 1, wherein the high-velocity ejection portions are formed at equal angular intervals on the circumferential surface of the injection head body.

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