JP2011115333A - Silencing cylinder and gas fire extinguishing system equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silencing cylinder for gas fire extinguishing equipment, the cylinder reducing the turbulent flow or noise based on the jet of fire extinguishing gas, and to provide a gas fire extinguishing system equipped with the same. <P>SOLUTION: In the silencing cylinder 30 having the pipeline 31, of which one opening end 31a is connected to the supply port of gas piping 22 for supplying the fire extinguishing gas into a target chamber where a fire occurs and which allows the fire extinguishing gas from the gas piping 22 to pass to discharge the same from the other opening end 31b, a branch pipe 33 closed at the leading end is provided while being branched from the pipeline 31 to extend. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a muffler for a gas fire extinguishing facility, and a gas fire extinguishing system including the same.

  Conventionally, as a fire extinguishing equipment that extinguishes a fire occurring in a target room, a gas fire extinguishing equipment that fills the target room with a fire extinguishing gas composed of an inert gas such as nitrogen gas, carbon dioxide gas, and halogen gas or a nonflammable gas is known. (For example, refer to Patent Document 1).

Such gas fire extinguishing equipment is particularly effective for extinguishing fire in a target room in which precision equipment such as a large computer and a server that are vulnerable to water and chemical extinguishing agents are installed.
In this gas fire extinguishing equipment, a high-pressure fire extinguishing is made from the supply port by making the supply port opening in the target chamber into a nozzle shape so that a large amount of fire extinguishing gas can be filled in the target chamber in a short time. Gas is spouted at a high speed.

JP 2000-255110 A

  However, when high-pressure fire-extinguishing gas is ejected at a high speed, turbulence occurs due to interference between the fire-extinguishing gas and the air in the target room in the vicinity of the supply port, and prevents smooth filling of the fire-extinguishing gas, Noise based on this turbulent flow (so-called turbulent noise) is generated. Further, the fire extinguishing gas is squeezed by the nozzle shape and rapidly compressed, and then rapidly expands when ejected from the supply port, so that an impact sound due to this rapid compression / expansion may be generated as noise. These noise energies may cause malfunctions and malfunctions of precision instruments.

  The present invention has been made in view of such problems, and it is possible to reduce turbulence and noise due to the emission of fire-extinguishing gas and to protect precision equipment installed in the fire-extinguishing target room. It is another object of the present invention to provide a cylinder for gas fire extinguishing equipment (hereinafter referred to as a sound deadening cylinder) and a gas fire extinguishing system provided with the same.

In order to solve the above problems, the present invention proposes the following means.
That is, the silencer according to the present invention has an open end on one side connected to a supply port of a gas pipe for supplying a fire extinguishing gas into a target room where a fire has occurred, and allows the fire extinguishing gas from the gas pipe to pass therethrough. A silencer cylinder having a conduit that discharges from the open end on the other side, is provided with a branch tube that branches off from the conduit and has a closed end.

  According to the muffler of such a feature, in a state where the opening end on one side of the pipe is connected to the supply port of the gas pipe, the fire extinguishing gas that has entered the pipe of the muffler from the supply port of the gas pipe, It flows toward the opening end on the other side of the pipe. As described above, when the fire extinguishing gas enters the pipe line, noise energy is generated by turbulent flow and compression / expansion generated when the fire extinguishing gas is injected from the supply port. In the present invention, part of the noise energy is branched. In this case, noise energy is reflected, diffused and absorbed in the branch pipe. Thereby, the noise energy is converted into heat energy, and as a result, the noise of the fire extinguishing gas injected from the opening end on the other side of the silencer can be reduced.

  In the silencer according to the present invention, the inner diameter of the branch portion of the branch pipe in the pipe may be smaller than the inner diameter of the other part of the pipe.

In this case, in the pipe line, a venturi pipe structure is formed in which the inner diameter of only the branch portion of the branch pipe is reduced. And when the fire extinguishing gas passes through this venturi structure,
It is possible to generate an interference sound that cancels out noise (main noise) that is generated when sprayed from the supply port.
That is, when the fire extinguishing gas flows from one side to the other side in the pipe, the flow rate of the fire extinguishing gas at the branching part in the pipe becomes faster than the other part in the pipe, and this flow rate increases. Noise (turbulent noise) based on fire extinguishing gas is generated. The turbulent noise is reflected in the branch pipe, so that an interference sound that cancels the main noise can be generated.
Thereby, it becomes possible to reduce the noise of the fire extinguishing gas injected from the opening end of the other side of the silencer cylinder.

Moreover, in the muffler tube according to the present invention, a member having a sound absorbing property may be laid on the inner peripheral surface of the branch pipe.
In this case, noise can be absorbed on the inner peripheral surface of the branch pipe, and noise introduced into the target room can be further reduced.

  The gas fire extinguishing system according to the present invention is provided in a gas supply source for storing the fire extinguishing gas, a gas pipe for supplying the fire extinguishing gas from the gas supply source into the target chamber, and a middle part of the gas pipe. A supply control valve for controlling the supply of the fire extinguishing gas into the target chamber; and any one of the above-described silencers, wherein the silencer is detachable from a supply port of the gas pipe that opens into the target chamber. It is attached to.

  In the gas fire extinguishing system having such a feature, when a fire occurs in the target room, the supply control valve is opened, so that the fire extinguishing gas is jetted from the gas pipe into the target room through the sound deadening cylinder. And according to this invention, the noise mentioned above can be reduced at low cost only by attaching a silencer cylinder to the supply port of gas piping.

  According to the present invention, even if high-pressure fire extinguishing gas is ejected from the supply port of the gas pipe toward the target room at a high speed, noise energy can be reduced by the branch pipe provided in the silencer cylinder. It can prevent and reduce noise energy.

It is the schematic which shows the gas fire extinguishing system which concerns on 1st Embodiment of this invention. It is sectional drawing of the silencer cylinder of 1st Embodiment. It is sectional drawing of the silencer cylinder of 2nd Embodiment.

Hereinafter, the gas fire extinguishing system 1 and the muffler cylinder 30 according to the first embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, a gas fire extinguishing system 1 according to this embodiment extinguishes a fire that has occurred in a target room 3 in which a precision device 2 such as a large computer or a server is accommodated.

  Here, in the target room 3, a floor plate 13 is installed with a space from the floor 11, and a top plate 14 is installed with a space from the ceiling 12. That is, the target room 3 is divided into the floor area 15, the equipment installation area 16, and the ceiling area 17 by the floor board 13 and the top board 14, and the precision equipment 2 is arranged in the equipment installation area 16 on the floor board 13. ing. The floor board 13 and the top board 14 are not limited to be provided so as to completely block the underfloor area 15, the equipment installation area 16, and the ceiling area 17, so that these areas communicate with each other as in the illustrated example. May be provided.

  The gas fire extinguishing system 1 is provided in a gas supply source 21 for storing a fire extinguishing gas, a gas pipe 22 for supplying the fire extinguishing gas from the gas supply source 21 into the target chamber 3, and a middle part of the gas pipe 22. A supply control valve 23 for controlling the supply of the fire extinguishing gas into the target chamber 3 and a muffler cylinder 30 connected to the supply port of the gas pipe 22 opened in the target chamber 3 are provided.

  The gas supply source 21 is constituted by a pressure vessel such as a gas cylinder that stores a fire extinguishing gas in a high pressure state, for example. As the fire extinguishing gas, for example, nitrogen gas, carbon dioxide gas, halogen gas, or the like can be used as an inert gas or a nonflammable gas. In this embodiment, nitrogen gas is suitably used.

  The gas pipe 22 is branched into a plurality of portions in the middle from the gas supply source 21 to the target chamber 3, whereby a plurality of (three in the illustrated example) supply ports of the gas pipe 22 are opened in the target chamber 3. is doing. The plurality of supply ports are preferably arranged at positions separated from each other so that the target room 3 can be filled with the fire extinguishing gas in a shorter time. In the example shown in the figure, the supply port is open to each of the under floor area 15, the equipment installation area 16, and the ceiling area 17 in the target room 3.

  As shown in FIG. 2, an orifice-shaped nozzle portion 25 that accelerates the flow of the fire-extinguishing gas ejected from the supply port of the gas pipe 22 is provided at the supply port of the gas pipe 22. Thereby, the fire extinguishing gas can be ejected into the target chamber 3 at a higher speed.

  The supply control valve 23 shown in FIG. 1 is configured to be openable and closable automatically or manually. That is, when a fire occurs in the target room 3, the supply control valve 23 opens electrically or mechanically based on a signal from a fire detector (not shown) provided in the target room 3, for example. For example, it may be configured to be opened by an operator.

  The supply control valve 23 in the illustrated example is provided closer to the gas supply source 21 than the branched portion of the gas pipe 22, but may be provided to each branched portion on the target chamber 3 side, for example.

  As shown in FIG. 2, the silencer cylinder 30 is formed in a cylindrical shape having a pipe line 31 through which the fire extinguishing gas from the gas pipe 22 passes. In the illustrated example, the duct 31 of the silencer cylinder 30 is formed in a circular cross section, but may be formed in an arbitrary cross sectional shape such as a polygonal shape or an elliptical shape.

  A connecting tube portion 32 that extends in the direction of the axis L3 of the conduit 31 is formed integrally with the open end 31a on one side (the right side in FIG. 2) of the conduit 31. By inserting the nozzle part 25 of the gas pipe 22 into the connecting pipe part 32, the muffler cylinder 30 is connected to the supply port of the gas pipe 22. In the illustrated example, in this connected state, the axis L3 of the pipe 31 coincides with the axis L2 of the gas pipe 22, but may be shifted, for example.

  A portion of the conduit 31 that is slightly closer to the other side than the intermediate portion between the opening end 31a on one side and the opening end 31b on the other side extends from the conduit 31 toward the radially outer side of the conduit 31. A branch pipe 33 whose tip is closed is provided. The branch pipe 33 is in communication with the pipe line 31 and can have any cross-sectional shape such as a circular shape, a polygonal shape, or an elliptical shape.

  In the illustrated example, the branch pipe 33 extends linearly along the radial direction of the pipe line 31, i.e., perpendicular to the axis L <b> 1 of the pipe line 31. You may be comprised so that it may incline and extend to one side or the other side from a perpendicular direction. Further, the branch pipe 33 may not only extend linearly but also be bent.

  In addition to the above configuration, the gas fire extinguishing system 1 includes a pressure relief opening damper 24 that releases excess pressure to the outside of the target chamber 3 when the inside of the target chamber 3 becomes a predetermined atmospheric pressure or higher due to supply of the fire extinguishing gas. May be. The pressure relief port damper 24 is preferably provided at a position as far as possible from the supply port of the gas pipe 22 so that the fire-extinguishing gas ejected from the gas pipe 22 flows through the entire target chamber 3.

Next, operation | movement of the gas fire extinguishing system 1 mentioned above is demonstrated.
When a fire occurs in the target chamber 3, the supply control valve 23 is opened automatically or manually, whereby the fire extinguishing gas flows from the gas supply source 21 to the supply port of the gas pipe 22. Further, the fire extinguishing gas is ejected from the gas pipe 22 into the target chamber 3 through the sound deadening cylinder 30.

Here, the flow of the fire extinguishing gas passing through the pipe line 31 of the sound deadening cylinder 30 will be described in detail.
The fire extinguishing gas that has entered the pipe 31 of the silencer 30 from the supply port of the gas pipe 22 flows toward the other opening end 31 b of the pipe 31. As described above, when the fire extinguishing gas enters the pipe line 31, noise energy is generated due to turbulent flow and compression / expansion generated when the fire extinguishing gas is injected from the supply port. At this time, in this embodiment, a part of the noise energy is introduced into the branch pipe 33, and the noise energy is reflected, diffused and absorbed in the branch pipe 33. As a result, the noise energy is converted into heat energy, and the noise of the fire extinguishing gas injected from the opening end 31b on the other side of the pipe line 31 can be reduced.

  Therefore, according to the muffler cylinder 30 of the present embodiment, a part of the generated noise energy can be converted into heat energy by the branch pipe 33, so that a high pressure is applied from the supply port of the gas pipe 22 toward the target chamber 3. Even if the fire extinguishing gas is ejected at a high speed, the generation of turbulence and noise can be reduced.

  And in the gas fire extinguishing system 1 of this embodiment, when the silencer cylinder 30 is made detachable from the supply port of the gas pipe 22, it is only necessary to attach the silencer cylinder 30 to the supply port of the conventionally known gas pipe 22. Since turbulent noise can be reduced, it can be implemented at low cost.

  In the gas fire extinguishing system 1 of the present embodiment, the fire is extinguished by jetting the fire extinguishing gas into the target chamber 3, but the pressure in the target chamber 3 is reduced by the fire extinguishing gas supplied into the target chamber 3. May rise. Here, since the gas fire extinguishing system 1 of the present embodiment includes the pressure avoidance opening damper 24, it is possible to release excessive pressure to the outside of the target chamber 3. Therefore, it is possible to prevent the pressure increase in the target room 3 from adversely affecting the building and the precision instrument 2.

  Moreover, in the gas fire extinguishing system 1 of this embodiment, since the supply port of the gas piping 22 is opened in each area | region of the underfloor area | region 15, the apparatus installation area | region 16, and the ceiling area | region 17 in the target room 3, these several area | regions Even if a fire occurs in any of the above, it is possible to make the fire extinguishing gas reach the fire occurrence point in a shorter time.

Next, a silencer cylinder according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 3 showing the muffler cylinder 40 of the second embodiment, the same components as those of the muffler cylinder 30 of the first embodiment shown in FIG.
The muffler cylinder 40 of the second embodiment is different from the muffler cylinder 40 of the first embodiment in that a venturi tube structure 50 is fitted at a branch point of the branch pipe 33 in the pipe 31.

  The venturi pipe structure 50 has a substantially cylindrical shape having an outer diameter substantially the same as the inner diameter of the inner peripheral surface of the pipe line 31, and the cylindrical central axis line is aligned with the axis line L 3 of the pipe line 31. Is inserted into the pipe 31. The venturi tube structure 50 is formed with a through hole 51 formed along the central axis thereof, that is, the axis L3 of the pipe line 31, and an opening on one side of the through hole 51 is formed on one side. A first tapered surface 52 that gradually increases in diameter toward the other side is formed, and a second tapered surface 53 that gradually increases in diameter toward the other side is formed in the opening on the other side of the through hole 51. .

  Further, the venturi tube structure 50 is formed with a branch hole 54 that communicates the outer peripheral surface thereof with the through hole 51 along the radial direction, and the venturi tube structure 50 is fitted into the pipe 31. , The branch hole 54 is in communication with the branch pipe 33.

  By providing the venturi pipe structure 50 as described above, in the pipe 31, the inner diameter of the flow path through which the fire extinguishing gas flows in the branch portion of the branch pipe 33 is the other part of the pipe 31, that is, The configuration is made smaller than the inner diameter of the portion other than the existence of the venturi tube structure 50. In this way, the silencer cylinder 40 of the present embodiment has a venturi structure in which the vicinity of the branch portion of the branch pipe 33 in the pipe line 31 is narrowed.

Here, the flow of the fire extinguishing gas passing through the pipe line 31 of the sound deadening cylinder 30 will be described in detail.
The fire extinguishing gas that has entered the pipe 31 of the silencer cylinder 40 from the supply port of the gas pipe 22 flows toward the other opening end 31 b of the pipe 31. That is, the fire extinguishing gas introduced from the opening end 31 a on one side of the pipe line 31 is concentrated toward the radially inner side of the pipe line 31 on the first tapered surface 52 of the venturi pipe structure 50, and the inside of the through hole 51. Pass through.

  Since the inner diameter of the through-hole 51 is narrower than that of other portions, the flow rate of the fire extinguishing gas is increased, and noise (turbulent flow noise) based on the fire extinguishing gas with the increased flow rate is generated. And since this noise reverberates in the branch pipe 33, the interference sound which cancels the noise (main noise) produced when it injects in the pipe line 31 from a supply port can be generated. Thereby, it becomes possible to reduce the noise of the fire extinguishing gas injected from the opening end 31b on the other side of the silencer cylinder 40.

Thus, in the muffler cylinder 40 of the second embodiment, when the fire extinguishing gas passes through the venturi tube structure 50, an interference sound that cancels the main noise can be generated to reduce the noise. .
Further, as in the first embodiment, the energy of the main noise can be introduced into the branch pipe 33 to be reflected, diffused and absorbed, so that the fire extinguishing gas injected from the opening end 31b on the other side of the pipe line 31 is used. Noise can be further reduced.

  In the present embodiment, the venturi pipe structure 50 is provided to reduce the inner diameter of the branch portion of the pipe 31. However, the branch portion of the pipe 31 itself may be formed to have a small diameter. .

The embodiment of the present invention has been described above, but the present invention is not limited to this, and can be appropriately changed without departing from the technical idea of the present invention.
For example, a sound-absorbing member may be laid on the inner peripheral surface of the branch pipe 33. In this case, noise can be absorbed on the inner peripheral surface of the branch pipe 33, and noise introduced into the target chamber 3 can be further reduced.

  And the gas fire extinguishing system 1 of this invention is not restricted to the fire extinguishing of the target chamber 3 divided into the several area | regions 15-17 by the floor board 13 or the top board 14, For example, only one area | region without the floor board 13 or the top board 14 is included. This can also be applied to extinguishing the target room 3. Moreover, the gas fire extinguishing system 1 of the present invention is not limited to the fire extinguishing in the target room 3 in which the precision device 2 is arranged, but can be applied to the extinguishing of another target room 3 such as a clean room.

DESCRIPTION OF SYMBOLS 1 Gas fire extinguishing system 3 Target chamber 21 Gas supply source 22 Gas piping 23 Supply control valve 24 Damper 25 Nozzle part 30 Silencer cylinder 31 Pipe 31a Open end 31b Open end 32 Connection pipe part 33 Branch pipe 40 Silencer pipe 50 Venturi pipe structure 51 Through hole 54 Branch hole

Claims (4)

A pipe having one open end connected to a supply port of a gas pipe for supplying a fire extinguishing gas into a target room where a fire has occurred, and allowing a fire extinguishing gas from the gas pipe to pass through and discharging from the other open end A muffler having a road,
A muffler pipe characterized in that a branch pipe that branches off from the pipe line and that has a closed end is provided.   The silencer cylinder according to claim 1, wherein an inner diameter of a branch portion of the branch pipe in the pipe is formed smaller than an inner diameter of another part of the pipe.   The silencer cylinder according to claim 1 or 2, wherein a member having a sound absorbing property is provided on an inner peripheral surface of the branch pipe. A gas supply source for storing the fire-extinguishing gas, a gas pipe for supplying the fire-extinguishing gas from the gas supply source to the target room, and a gas pipe provided in the middle of the gas pipe to control the supply of the fire-extinguishing gas to the target room A supply control valve, and a muffler tube according to any one of claims 1 to 3,
The gas fire extinguishing system, wherein the silencer is detachably attached to a supply port of the gas pipe that opens into the target chamber.

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