JP2013000195A - Nozzle structure - Google Patents
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- JP2013000195A JP2013000195A JP2011131696A JP2011131696A JP2013000195A JP 2013000195 A JP2013000195 A JP 2013000195A JP 2011131696 A JP2011131696 A JP 2011131696A JP 2011131696 A JP2011131696 A JP 2011131696A JP 2013000195 A JP2013000195 A JP 2013000195A
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本発明は、火災発生時に建物の消火対象区画内にＮ２ガスまたはハロゲン化物ガスなどの消火ガスを消火剤として放出することによって、消火対象区画内の消火ガス濃度を消炎濃度以上にして消火するガス系消火設備の消火ガス噴射装置として有利に実施することができるノズル構造体に関し、さらに詳しくは、消火対象区画内に設けられる噴射ヘッドから消火ガスを噴射した際に発生する大音響を低減することができるノズル構造体に関する。 The present invention extinguishes the fire extinguishing gas concentration in the fire extinguishing target concentration to be higher than the fire extinguishing concentration by releasing a fire extinguishing gas such as N 2 gas or halide gas into the fire extinguishing target compartment of the building when a fire occurs. More particularly, the present invention relates to a nozzle structure that can be advantageously implemented as a fire extinguishing gas injection device for a gas fire extinguishing facility, and more specifically, reduces a large sound generated when a fire extinguishing gas is ejected from an ejection head provided in a fire extinguishing target section. It is related with the nozzle structure which can do.
従来から、建物には、消火剤としてＣＯ２ガスおよびＮ２ガスおよびハロゲン化物などの消火ガスを消火対象区画内に放出して、その消火対象区画内の消火ガス濃度を消炎濃度以上にすることによって消火を行うノズル構造体を備えたガス系消火設備が装備されている。 Conventionally, in buildings, fire extinguishing gases such as CO 2 gas, N 2 gas and halides are released as extinguishing agents into the fire extinguishing target compartment, and the fire extinguishing gas concentration in the fire extinguishing target compartment is set to be higher than the extinguishing concentration. It is equipped with gas fire extinguishing equipment equipped with a nozzle structure that extinguishes fire.
図８は、従来技術のノズル構造体１を有するガス系消火設備を示す斜視図である。従来のガス系消火設備に具備されるノズル構造体１は、消火ガス供給源２から火災発生時に供給される高圧の消火ガスを消火対象区画内に向けて噴射する噴射ヘッド３と、噴射ヘッド３が接続され、消火ガス供給源２から噴射ヘッド３へ消火ガスを導く導管４とを備える。 FIG. 8 is a perspective view showing a gas fire extinguishing facility having a nozzle structure 1 of the prior art. A nozzle structure 1 provided in a conventional gas fire extinguishing facility includes an ejection head 3 that ejects a high-pressure fire extinguishing gas supplied from a fire extinguishing gas supply source 2 toward a fire extinguishing target section, and an ejection head 3. And a conduit 4 for guiding the fire extinguishing gas from the fire extinguishing gas supply source 2 to the jet head 3.
導管４は、消火ガス供給源２に接続される主管５と、主管５に介在される分岐管６と、分岐管６によって主管５から消火ガスが導かれ、噴射ヘッド３が接続される枝管７とを有する。主管５は、建物の躯体またはその躯体に固定された基台８およびブラケット９にＵボルトなどの締結具１０によって締結され、消火ガス噴射時におけるガス噴射反力などに起因する噴射ヘッド３の変位が阻止された状態で設置されている（たとえば、特許文献１参照）。 The conduit 4 includes a main pipe 5 connected to the fire extinguishing gas supply source 2, a branch pipe 6 interposed in the main pipe 5, and a branch pipe to which the fire extinguishing gas is guided from the main pipe 5 by the branch pipe 6 and to which the injection head 3 is connected. 7. The main pipe 5 is fastened to a building housing or a base 8 and a bracket 9 fixed to the housing by a fastener 10 such as a U-bolt, and the displacement of the jet head 3 due to a gas jet reaction force at the time of fire extinguishing gas jet (See, for example, Patent Document 1).
前記従来の技術では、消火ガス供給源２から導管４を経て供給される高圧の消火ガスを噴射ヘッド３から大量に噴射するため、噴射ヘッド３のノズル部１１に形成されるノズル孔１２から高速で噴射される消火ガス流によって、いわば空気を切り裂くような大音響を発生してしまうという問題がある。 In the conventional technique, a large amount of high-pressure fire extinguishing gas supplied from the fire extinguishing gas supply source 2 through the conduit 4 is ejected from the ejection head 3, so that the high speed from the nozzle hole 12 formed in the nozzle portion 11 of the ejection head 3. The fire extinguishing gas flow jetted in the air causes a problem of generating a large sound that cuts the air.
本発明の目的は、噴射ヘッドからの消火ガスの噴射流に起因する音響を減衰させることができるノズル構造体を提供することである。 The objective of this invention is providing the nozzle structure which can attenuate the sound resulting from the jet flow of the fire extinguishing gas from a jet head.
本発明は、高圧の消火ガスを空間に向けて噴射する複数のノズル孔を有する噴射ヘッドと、
噴射ヘッドが接続され、噴射ヘッドに高圧の消火ガスを導く導管と、
導管に高圧の消火ガスを供給する消火ガス供給源と、
多孔質材料から成り、噴射ヘッド内に各ノズル孔の開口に直前に、噴射ヘッドの前記開口を規定する表面部に密接して配置される吸音部材を有する消音装置とを含むことを特徴とするノズル構造体である。
The present invention includes an ejection head having a plurality of nozzle holes for ejecting high-pressure fire extinguishing gas toward a space;
A conduit to which the injection head is connected and leads high-pressure fire extinguishing gas to the injection head;
A fire-extinguishing gas supply source for supplying high-pressure fire-extinguishing gas to the conduit;
A muffler comprising a sound absorbing member made of a porous material and disposed in close contact with a surface portion defining the opening of the ejection head immediately before the opening of each nozzle hole in the ejection head. This is a nozzle structure.
また本発明は、前記複数のノズル孔は、噴射ヘッドの前記開口を規定する表面部に分散して配置されることを特徴とする。 Further, the invention is characterized in that the plurality of nozzle holes are distributed and arranged on a surface portion that defines the opening of the ejection head.
本発明に従えば、消火ガス供給源から導管に供給された高圧の消火ガスは、噴射ヘッドを介して建物内の空間に向けて噴射される。このような噴射ヘッドには、複数のノズル孔を有するノズル部が設けられるとともに、各ノズル孔の開口の直前に、吸音部材が設けられ、噴射ヘッドのノズル部から高速で噴射される消火ガスの噴射流に起因する大きな噴射音の発生を防止することができる。また、各ノズル孔から噴射される消火ガスは、吸音部材内で徐々に減圧膨張し、その流速を下げることができる。これによって、消火ガスの噴射に起因する噴射音の発生をさらに抑制することができる。 According to the present invention, the high-pressure fire extinguishing gas supplied to the conduit from the fire extinguishing gas supply source is jetted toward the space in the building through the jet head. In such an ejection head, a nozzle portion having a plurality of nozzle holes is provided, and a sound absorbing member is provided immediately before the opening of each nozzle hole, and a fire extinguishing gas ejected from the nozzle portion of the ejection head at high speed is provided. Generation of a large injection sound due to the injection flow can be prevented. Moreover, the fire extinguishing gas injected from each nozzle hole can be gradually decompressed and expanded in the sound absorbing member, and the flow rate can be lowered. Thereby, generation | occurrence | production of the injection sound resulting from injection of fire extinguishing gas can further be suppressed.
本発明によれば、噴射ヘッドに消音装置が設けられるので、火災発生時に噴射ヘッドのノズル部から消火ガスが噴射されても大きな噴射音が発生することを防止することができる。 According to the present invention, since the silencer is provided in the ejection head, it is possible to prevent a large ejection sound from being generated even if fire extinguishing gas is ejected from the nozzle portion of the ejection head when a fire occurs.
図１は、本発明の一実施形態のノズル構造体２１を示す断面図であり、図２は図１の上方から見たノズル構造体２１の平面図である。なお、図１は図解を容易にするため、ノズル構造体２１は中心軸線Ｌ１を含む仮想一平面に関して片側が断面で示されている。本実施形態のノズル構造体２１は、高圧の消火ガスを前記消火対象区画内の空間に向けて噴射するノズル部２２を有する噴射ヘッド２３と、噴射ヘッド２３が接続され、噴射ヘッド２３に高圧の消火ガスを導く導管２４と、導管２４に高圧の消火ガスを供給する消火ガス供給源２５と、噴射ヘッド２３に設けられ、ノズル部２２に形成される複数（本実施形態では７）のノズル孔２６から噴射される消火ガスの噴射による噴射音を減衰させる消音装置２７とを含む。 FIG. 1 is a cross-sectional view showing a nozzle structure 21 according to an embodiment of the present invention, and FIG. 2 is a plan view of the nozzle structure 21 as viewed from above in FIG. For ease of illustration in FIG. 1, the nozzle structure 21 is shown in cross section on one side with respect to a virtual plane including the central axis L1. The nozzle structure 21 of the present embodiment is connected to an ejection head 23 having a nozzle portion 22 that ejects a high-pressure fire extinguishing gas toward a space in the fire extinguishing target section, and the ejection head 23 has a high pressure. A conduit 24 for introducing a fire extinguishing gas, a fire extinguishing gas supply source 25 for supplying a high pressure fire extinguishing gas to the conduit 24, and a plurality of (7 in the present embodiment) nozzle holes provided in the injection head 23 and formed in the nozzle portion 22. And a muffler 27 for attenuating the injection sound caused by the injection of the fire extinguishing gas injected from 26.
前記消火ガスは、Ｎ２ガスおよびＣＯ２ガスなどの不活性ガスまたはハロゲン化物ガスなどの活性ガスによって実現される。このような消火ガスを消火剤として放出することによって、消火対象区画内の消火ガス濃度を消炎濃度以上にして消火することができる。 The fire extinguishing gas is realized by an inert gas such as N 2 gas and CO 2 gas or an active gas such as halide gas. By discharging such a fire extinguishing gas as a fire extinguishing agent, the fire extinguishing gas concentration in the fire extinguishing target section can be made higher than the flame extinguishing concentration to extinguish the fire.
前記噴射ヘッド２３と消音装置２７とによって、前記ノズル構造体２１が構成される。このようなノズル構造体２１には、消火ガス供給源２５から導管２４を経て噴射ヘッド２３に消火ガスが供給される。導管２４は、図８に示される従来技術と同様に、消火ガス供給源２５に接続される主管と、主管に介在される分岐管と、分岐管に接続される枝管とを含んで構成されてもよい。このような導管２４を経て消火ガス供給源２５からの高圧の消火ガスが、噴射ヘッド２３に導かれる。導管２４は、基台およびブラケットにＵボルトなどの締結具によって締結され、変位が阻止された状態で建物の天井部または壁などにに設置されている。 The nozzle structure 21 is configured by the ejection head 23 and the silencer 27. Such a nozzle structure 21 is supplied with a fire extinguishing gas from the fire extinguishing gas supply source 25 through the conduit 24 to the ejection head 23. The conduit 24 includes a main pipe connected to the fire extinguishing gas supply source 25, a branch pipe interposed in the main pipe, and a branch pipe connected to the branch pipe, as in the prior art shown in FIG. May be. High pressure fire extinguishing gas from the fire extinguishing gas supply source 25 is guided to the ejection head 23 through such a conduit 24. The conduit 24 is fastened to the base and the bracket by a fastener such as a U-bolt, and is installed on the ceiling or wall of the building in a state where displacement is prevented.
図３はケーシング３５を斜め上方から見た斜視図であり、図４はケーシング３５を斜め下方から見た斜視図である。図１および図２をも参照して、前記消音装置２７は、円筒状の周壁３０と、周壁３０の軸線方向一端部（図１では下端部）に該周壁３０の軸線に関して半径方向内方に突出して円環状または周方向に間欠的に形成される突部３１と、周壁３０の軸線方向他端部に、噴射ヘッド２３に着脱可能に接続される端壁３２と、周壁３０内にたとえば円柱状の吸音部材３３とを含む。 FIG. 3 is a perspective view of the casing 35 as viewed obliquely from above, and FIG. 4 is a perspective view of the casing 35 as viewed from obliquely below. Referring also to FIGS. 1 and 2, the silencer 27 includes a cylindrical peripheral wall 30 and an axial end of the peripheral wall 30 in the axial direction (a lower end in FIG. 1) radially inward with respect to the axial line of the peripheral wall 30. A projecting portion 31 protruding and formed intermittently in the annular or circumferential direction, an end wall 32 detachably connected to the ejection head 23 at the other axial end of the circumferential wall 30, and a circular shape in the circumferential wall 30, for example And a columnar sound absorbing member 33.
前記周壁３０および端壁３２は、有底筒状のケーシング３５を構成する。端壁３２には、軸線Ｌ１に同軸に取付け筒部３６が一体的に形成される。取付け筒部３６の内周部には、内ねじが形成される。前記吸音部材３３は、ケーシング３５内に収容され、前記突部３１によって保持される。 The peripheral wall 30 and the end wall 32 constitute a bottomed cylindrical casing 35. An attachment tube portion 36 is integrally formed on the end wall 32 coaxially with the axis L1. An inner screw is formed on the inner peripheral portion of the attachment cylinder portion 36. The sound absorbing member 33 is accommodated in the casing 35 and is held by the protrusion 31.
ノズル部２２は、内ねじが形成される略円筒状の螺合部２２ａと、螺合部２２ａに同軸に連なる円筒状の胴部２２ｂと、螺合部２２ａの軸線方向他端部に直角に連なる隔壁部２２ｃとを有する。隔壁部２２ｃには、前記複数のノズル孔２６が形成される。隔壁部２２ｃには、ケーシング３５内で端壁３２側に配置される吸音部材３３の端面が密接し、該吸音部材３３と隔壁部２２ｃとの間に隙間が生じていない。このようにして各吸音部材３３は、ケーシング３５内に収容されている。 The nozzle part 22 includes a substantially cylindrical threaded part 22a in which an internal thread is formed, a cylindrical body part 22b coaxially connected to the threaded part 22a, and a second end in the axial direction of the threaded part 22a. And a continuous partition wall 22c. The plurality of nozzle holes 26 are formed in the partition wall portion 22c. The end face of the sound absorbing member 33 disposed on the end wall 32 side in the casing 35 is in close contact with the partition wall 22c, and no gap is generated between the sound absorbing member 33 and the partition wall 22c. In this way, each sound absorbing member 33 is accommodated in the casing 35.
前記複数のノズル孔２６の合計は、次の表１に示すように、コード番号によって割当てられた等価噴口面積を有する。このような等価噴口面積は、「不活性ガス消火設備等の噴射ヘッドの基準」（平成７年６月６日消防庁告示第７号）によって規定されている。 The total of the plurality of nozzle holes 26 has an equivalent nozzle area assigned by a code number as shown in Table 1 below. Such an equivalent nozzle area is defined by “standards for jet heads for inert gas fire extinguishing equipment” (June 6, 1995, Fire Department Notification No. 7).
消音装置２７において、吸音部材３３は、一方の端面と端壁３２の内面とが面接触し、かつ他方の端面とノズル部２２の端面とが面接触した状態で、ケーシング３５内の空間に収容される。したがって、吸音部材３３は、前述したようにケーシング３５内の空間に軸線Ｌ１方向に端壁３２から突部３１にわたって隙間なく詰まった状態で収容され、隔壁部２２ｃに端壁３２側の吸音部材３３の端面が密接している。各ノズル孔２６からケーシング３５内へ流出する消火ガスは、前記端壁３２側の吸音部材３３内に直接流れ込み、ケーシング３５の開口部側に連なる残余の吸音部材３３の領域に流入して拡散するように構成されている。 In the silencer 27, the sound absorbing member 33 is accommodated in a space in the casing 35 in a state where one end surface and the inner surface of the end wall 32 are in surface contact, and the other end surface and the end surface of the nozzle portion 22 are in surface contact. Is done. Therefore, as described above, the sound absorbing member 33 is accommodated in the space in the casing 35 in a state where the sound absorbing member 33 is clogged from the end wall 32 to the protruding portion 31 in the direction of the axis L1 without any gap, and the sound absorbing member 33 on the end wall 32 side is stored in the partition wall portion 22c. The end faces of are close. The fire extinguishing gas flowing out from each nozzle hole 26 into the casing 35 flows directly into the sound absorbing member 33 on the end wall 32 side, and flows into the region of the remaining sound absorbing member 33 connected to the opening side of the casing 35 and diffuses. It is configured as follows.
前記吸音部材３３は、微小な柱状の空隙が連続した多孔質金属から成る。このような吸音部材３３は、前述したようにケーシング３５内の空間に臨む各ノズル孔２６の開口の直前に、隔壁部２２ｃの表面に密接して設けられる。これによって、消音装置２７は、導管２４から供給される消火ガスを、吸音部材３３の全体に拡散しながら徐々に減圧膨張させて急激に減速させ、流速を下げることができる。これによって、消火ガスの噴射に起因する周囲の空気に衝撃波を伴う強い乱れを誘起することが防がれ、噴射音を抑制することができる。 The sound absorbing member 33 is made of a porous metal in which minute columnar gaps are continuous. Such a sound absorbing member 33 is provided in close contact with the surface of the partition wall portion 22c immediately before the opening of each nozzle hole 26 facing the space in the casing 35 as described above. As a result, the silencer 27 can gradually reduce the pressure and expand the fire extinguishing gas supplied from the conduit 24 while gradually diffusing the entire sound absorbing member 33, thereby reducing the flow velocity. As a result, it is possible to prevent a strong turbulence accompanied by a shock wave in ambient air resulting from the injection of the fire extinguishing gas, and to suppress the injection sound.
詳細には、複数のノズル孔２６によって予め分散させた消火ガスの流れは、ケーシング３５内の空間に隙間なく詰められている吸音部材３３に流入するので、各ノズル孔２６から放出される消火ガスは、多孔質金属からなる吸音部材３３内へ直接流入し、多孔質金属内の空隙を経て、最も開口部側に配置される吸音部材３３の領域を通過した消火ガスを、蓋体３１の開口から直接、外部へ放出することができる。 Specifically, the flow of the fire extinguishing gas that has been dispersed in advance by the plurality of nozzle holes 26 flows into the sound absorbing member 33 that is packed in the space inside the casing 35 without any gaps, so that the fire extinguishing gas that is released from each nozzle hole 26. Is directly flowing into the sound absorbing member 33 made of porous metal, and the fire extinguishing gas that has passed through the region of the sound absorbing member 33 arranged on the most opening side through the gap in the porous metal is opened in the lid 31. Can be discharged directly from the outside.
このようにノズル孔２６から放出される消火ガスを吸音部材３３へ直接流入させることによって、消火ガスを吸音部材３３内で充分に拡散させて流速を急激に減衰させることができ、ノズル孔２６から放出直後に過膨張して衝撃波を発生しない状態で消火ガスを外部へ放出することができる。 In this way, by directly flowing the fire extinguishing gas discharged from the nozzle hole 26 into the sound absorbing member 33, the fire extinguishing gas can be sufficiently diffused in the sound absorbing member 33 to rapidly attenuate the flow velocity. The fire extinguishing gas can be released to the outside in a state where it is overexpanded immediately after the release and does not generate a shock wave.
図５は消音装置２７による消音効果を説明するためのグラフである。縦軸が音圧レベル（ｄＢ）であり、横軸が消火ガスの放出開始からの経過時間（ｓｅｃ）である。同図において、ライン９１は消音装置２７を用いない場合のグラフであり、ライン９２は消音装置２７を用いた場合のグラフである。 FIG. 5 is a graph for explaining the silencing effect by the silencing device 27. The vertical axis is the sound pressure level (dB), and the horizontal axis is the elapsed time (sec) from the start of the fire extinguishing gas release. In the figure, a line 91 is a graph when the silencer 27 is not used, and a line 92 is a graph when the silencer 27 is used.
本件発明者は、ノズル構造体２１による消音効果を確認するため、測定用周波数範囲が２０Ｈｚ〜１００ｋＨｚの音響について、前述の図１〜図４のノズル構造体２１を用いて消火ガス噴射直後の音圧レベルを測定した。測定用の集音マイクは、ノズル構造体２１の前方１ｍ、略水平に右へ４５°の斜め前の位置に設置し、市販の騒音計によって測定した。 In order to confirm the silencing effect of the nozzle structure 21, the present inventor uses the nozzle structure 21 of FIGS. 1 to 4 described above for sound having a measurement frequency range of 20 Hz to 100 kHz. The pressure level was measured. The sound collecting microphone for measurement was installed 1 m in front of the nozzle structure 21 and at a position obliquely in front of 45 ° to the right substantially horizontally, and measured with a commercially available sound level meter.
同図において、消火ガス放出開始直後では、消音装置２７を用いない場合、音圧レベルは約１４０ｄＢであるが、消音装置２７を用いた場合には、音圧レベルが約１００ｄＢまで下がっている。同様に、消火ガス放出開始から６０秒後では、消音装置２７を用いない場合、音圧レベルは約１２５ｄＢであるが、消音装置２７を用いた場合には、音圧レベルが約８５ｄＢまで下がっている。すなわち、消音装置２７を用いない場合に比べて、消音装置２７を用いた場合に比べて音圧レベルを約４０ｄＢ下げることができる。 In the figure, immediately after the start of the extinguishing gas release, the sound pressure level is about 140 dB when the silencer 27 is not used, but when the silencer 27 is used, the sound pressure level is reduced to about 100 dB. Similarly, after 60 seconds from the start of fire extinguishing gas release, the sound pressure level is about 125 dB when the silencer 27 is not used, but when the silencer 27 is used, the sound pressure level drops to about 85 dB. Yes. That is, compared with the case where the silencer 27 is not used, the sound pressure level can be lowered by about 40 dB compared to the case where the silencer 27 is used.
このように、本実施形態の噴射ヘッド２３と消音装置２７とによって構成されるノズル構造体２１は、吸音部材３３が、ケーシング３５内の空間に臨むノズル孔２６の開口の直前に、各開口を規定する隔壁部２２ｃの表面部に密接して設けることによって、導管２４から供給される消火ガスを吸音部材３３の全体に拡散しながら徐々に減圧膨張して急激に減速させ、消音装置２７から噴射直後の消火ガスの流速を下げることができ、消火ガスの噴射に起因する噴射音の発生を抑制することができる。さらに、ノズル構造体２１は、消音装置２７によって、消火ガスの急激な減圧膨張を抑制することができるので、急激な減圧膨張に起因する衝撃波による騒音の発生を抑制することができる。 As described above, the nozzle structure 21 configured by the ejection head 23 and the silencer 27 of the present embodiment has each opening formed immediately before the opening of the nozzle hole 26 where the sound absorbing member 33 faces the space in the casing 35. By providing in close contact with the surface portion of the partition wall 22c to be defined, the fire extinguishing gas supplied from the conduit 24 is gradually decompressed and expanded while being diffused throughout the sound absorbing member 33, and then suddenly decelerated and injected from the silencer 27. The flow rate of the fire extinguishing gas immediately after that can be lowered, and the generation of the injection sound resulting from the injection of the fire extinguishing gas can be suppressed. Further, since the nozzle structure 21 can suppress the rapid decompression and expansion of the fire extinguishing gas by the silencer 27, it is possible to suppress the generation of noise due to the shock wave caused by the rapid decompression and expansion.
図６は本発明の他の実施形態のノズル構造体２１ａを示す断面図であり、図７は図６の切断面線ＶＩＩ−ＶＩＩから見たケーシング３５の底面図である。なお、図６は図解を容易にするため、ノズル構造体２１ａは中心軸線Ｌ１を含む仮想一平面に関して片側だけが断面で示されている。前述の実施形態に対応する部分には、同一の参照符を付す。本実施形態のノズル構造体２１ａは、ケーシング３５と、ケーシング３５内に同軸に形成される円板状のノズル部２２とによって構成される。ノズル部２２は、複数のノズル孔２６が分散して形成される隔壁部２２ｃを有し、これらのノズル孔２６の合計は、前述の表１に示すように、コード番号によって割当てられた等価噴出口面積を有し、ケーシング３５内の空間に臨んでほぼ均一に分布して形成されている。 FIG. 6 is a cross-sectional view showing a nozzle structure 21a according to another embodiment of the present invention, and FIG. 7 is a bottom view of the casing 35 as seen from the cutting plane line VII-VII in FIG. In FIG. 6, for ease of illustration, the nozzle structure 21a is shown in cross section only on one side with respect to a virtual plane including the central axis L1. Portions corresponding to the above-described embodiment are given the same reference numerals. The nozzle structure 21 a of the present embodiment is configured by a casing 35 and a disk-like nozzle portion 22 formed coaxially in the casing 35. The nozzle portion 22 has a partition wall portion 22c formed by dispersing a plurality of nozzle holes 26. The total of these nozzle holes 26 is equivalent to the equivalent jet assigned by the code number as shown in Table 1 above. It has an exit area and is formed in a substantially uniform distribution facing the space in the casing 35.
ノズル部２２の前記複数のノズル孔２６は、隔壁部２２ｃにその厚み方向に貫通して軸線Ｌ１に平行に形成されている。隔壁部２２ｃの開口側の表面には、ケーシング３５に収容された吸音部材３３が接触し、各ノズル孔２６から噴出した消火ガスが直接流入する。端壁３２と隔壁部２２ｃとの間には、空間５０が形成される。取付け筒部３６から供給される消火ガスは、前記空間５０に流入した後、各ノズル孔２６へ流入するので、消火ガスを各ノズル孔２６によって吸音部材３３の前記ノズル部２２に臨む端面のほぼ全面に分散して供給し、各ノズル孔２６を通過する消火ガスの流速を均一化することができる。 The plurality of nozzle holes 26 of the nozzle portion 22 penetrate the partition wall portion 22c in the thickness direction and are formed in parallel to the axis L1. The sound absorbing member 33 accommodated in the casing 35 comes into contact with the opening side surface of the partition wall portion 22c, and the fire extinguishing gas ejected from each nozzle hole 26 directly flows in. A space 50 is formed between the end wall 32 and the partition wall portion 22c. Since the fire extinguishing gas supplied from the mounting cylinder part 36 flows into the space 50 and then into each nozzle hole 26, the fire extinguishing gas almost flows into the nozzle part 22 of the sound absorbing member 33 through each nozzle hole 26. Dispersed and supplied over the entire surface, the flow rate of the fire extinguishing gas passing through each nozzle hole 26 can be made uniform.
このような構成によってもまた、前述の実施形態と同様に、吸音部材３３によって、消火ガスの噴射流に起因する音響振動を吸収し、消火ガスの噴射に起因する噴射音の発生を抑制することができる。 Also with such a configuration, similarly to the above-described embodiment, the sound absorbing member 33 absorbs the acoustic vibration caused by the fire-extinguishing gas jet flow and suppresses the generation of the jet sound caused by the fire-extinguishing gas jet. Can do.
このように放出する消火ガス量が同じであれば、各ノズル孔２６を中心軸線Ｌから半径線方向に離れた位置に分散させて配置することによって、吸音部材３３の厚みをＴ１＞Ｔ２とし、ガス出口内径をＩＤ１＞ＩＤ２としても、同様な消音効果が得られることが確認された。これによって、各ノズル孔２６を周方向に分散させて配置することによって、消音効果を低下させずに噴射ヘッドを小型化することができる。 If the amount of fire extinguishing gas released in this way is the same, by disperse and arrange the nozzle holes 26 at positions away from the central axis L in the radial direction, the thickness of the sound absorbing member 33 is T1> T2, It was confirmed that a similar silencing effect was obtained even when the gas outlet inner diameter was ID1> ID2. Accordingly, by disposing the nozzle holes 26 in the circumferential direction, the ejection head can be reduced in size without reducing the noise reduction effect.
図６に示すノズル構造体は、図１に示すノズル構造体に比べて、吸音部材３３の厚みが薄いため、消火ガスが噴射ヘッドから放出されるまでに消火ガスが受ける流路抵抗が小さく、流速の低下を抑えることができる。そのため、消火対象区画内の消火ガスの到達距離が小さくなることを防止することができる。また、消火ガスの流路抵抗が小さくなるため、液体系消火ガスを放出する場合であっても、到達距離の減少を少なくし、噴射ヘッドから所要の到達距離を確保することができ、気体系消火ガスに比べて流路抵抗の高い液体系消火ガスにも本発明に係るノズル構造体を好適に実施することができる。 The nozzle structure shown in FIG. 6 has a smaller thickness of the sound absorbing member 33 than the nozzle structure shown in FIG. 1, so the flow resistance that the fire extinguishing gas receives before the fire extinguishing gas is discharged from the ejection head is small. A decrease in flow rate can be suppressed. Therefore, it is possible to prevent the arrival distance of the fire extinguishing gas in the fire extinguishing target section from being reduced. In addition, since the flow resistance of the fire extinguishing gas is reduced, even when the liquid fire extinguishing gas is released, the reduction in the reach distance can be reduced, and the required reach distance from the ejection head can be secured. The nozzle structure according to the present invention can be preferably implemented also in a liquid fire extinguishing gas having a higher flow path resistance than a fire extinguishing gas.
本発明のさらに他の実施形態では、吸音部材は円板状とし、複数枚を同軸に積層した状態でケーシング内に収容して用いるようにしてもよい。このように円板状の吸音部材を用いることによって、厚みまたは収容枚数を容易に調整することができ、製造状の利便性を向上することができる。 In still another embodiment of the present invention, the sound absorbing member may be formed in a disk shape and housed in a casing in a state where a plurality of the sound absorbing members are stacked coaxially. Thus, by using a disk-shaped sound-absorbing member, the thickness or the number of accommodated sheets can be easily adjusted, and the convenience of manufacturing can be improved.
このように、本実施形態の消音装置２７ａは、吸音部材３３が、ケーシング３５内の空間に臨む各ノズル孔２６の開口の直前に、各開口を規定するノズル部２２の表面部に密接して設けることによって、導管２４から供給される消火ガスを吸音部材３３の積層体全体に拡散しながら徐々に減圧膨張させて急激に減速させ、流速を下げることができ、消火ガスの噴射に起因する噴射音の発生を抑制することができる。さらに、消音装置２７ａは、消火ガスの急激な減圧膨張を抑制するように構成されているので、急激な減圧膨張に起因する騒音の発生を抑制することができる。 Thus, in the silencer 27a of the present embodiment, the sound absorbing member 33 is in close contact with the surface portion of the nozzle portion 22 that defines each opening immediately before the opening of each nozzle hole 26 facing the space in the casing 35. By providing, the fire extinguishing gas supplied from the conduit 24 can be gradually decompressed and expanded while diffusing throughout the laminated body of the sound absorbing member 33 to rapidly decelerate, and the flow rate can be lowered. Generation of sound can be suppressed. Furthermore, since the silencer 27a is configured to suppress the rapid decompression and expansion of the fire extinguishing gas, it is possible to suppress the generation of noise due to the rapid decompression and expansion.
２１ ノズル構造体
２０ 天井部
２２ ノズル部
２３ 噴射ヘッド
２４ 導管
２５ 消火ガス供給源
２６ ノズル孔
２７，２７ａ 消音装置
３０ 周壁
３２ 端壁
３３ 吸音部材
DESCRIPTION OF SYMBOLS 21 Nozzle structure 20 Ceiling part 22 Nozzle part 23 Injection head 24 Conduit 25 Fire extinguishing gas supply source 26 Nozzle hole 27, 27a Silencer 30 Peripheral wall 32 End wall 33 Sound absorption member
Claims (2)
噴射ヘッドが接続され、噴射ヘッドに消火ガスを導く導管と、
導管に消火ガスを供給する消火ガス供給源と、
多孔質材料から成り、噴射ヘッド内に各ノズル孔の開口に直前に、噴射ヘッドの前記開口を規定する表面部に密接して配置される吸音部材を有する消音装置とを含むことを特徴とするノズル構造体。 An ejection head having a plurality of nozzle holes for ejecting fire extinguishing gas toward the space;
A conduit to which the ejection head is connected and leads the fire extinguishing gas to the ejection head;
A fire-extinguishing gas supply source for supplying fire-extinguishing gas to the conduit;
A muffler comprising a sound absorbing member made of a porous material and disposed in close contact with a surface portion defining the opening of the ejection head immediately before the opening of each nozzle hole in the ejection head. Nozzle structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2018057724A (en) * | 2016-10-07 | 2018-04-12 | ニッタン株式会社 | Gas discharge nozzle for gas fire extinguishment facility |
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|---|---|---|---|---|
| US4082160A (en) * | 1975-04-16 | 1978-04-04 | Firma Carl Freudenberg | Silencer for exhausting gas streams |
| EP1151800A2 (en) * | 2000-05-05 | 2001-11-07 | Vesta Srl | Silenced nozzle for discharge of extinguishing gas |
| JP2011125673A (en) * | 2009-11-02 | 2011-06-30 | Koatsu Co Ltd | Jet head having silencing function for gas-based fire extinguishing system |
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2011
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4082160A (en) * | 1975-04-16 | 1978-04-04 | Firma Carl Freudenberg | Silencer for exhausting gas streams |
| EP1151800A2 (en) * | 2000-05-05 | 2001-11-07 | Vesta Srl | Silenced nozzle for discharge of extinguishing gas |
| JP2011125673A (en) * | 2009-11-02 | 2011-06-30 | Koatsu Co Ltd | Jet head having silencing function for gas-based fire extinguishing system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018057724A (en) * | 2016-10-07 | 2018-04-12 | ニッタン株式会社 | Gas discharge nozzle for gas fire extinguishment facility |
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