JP2011115332A - Rectification cylinder and gas fire extinguishing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the turbulent flow and noise based on the ejection of fire extinguishing gas in a fire extinguishing gas system. <P>SOLUTION: A rectification cylinder 30 has the pipeline 31 connected to the supply port of gas piping 22 for supplying the fire extinguishing gas into a target chamber where a fire occurs to permit the fire extinguishing gas from the gas piping 22 to pass. In this rectification cylinder 30, a large number of grooves 33, which extend from one opening end 31a of the pipeline 31 to the other opening end 31b thereof, are formed to the inner peripheral surface 31c of the pipeline 31 and are arranged circumferentially in the inner peripheral surface 31c so as to become parallel to each other along the pipeline in the longitudinal direction. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a flow straightening tube for a gas fire extinguishing equipment and a gas fire extinguishing system including the same.

Conventionally, as a fire extinguishing equipment that extinguishes a fire that has occurred in a target room, there is 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 (for example, 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 2000-60984 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. This noise energy may cause malfunctions and malfunctions of precision instruments.

  The present invention has been made in view of the above-described circumstances, and it is possible to reduce turbulence and noise based on the emission of a fire extinguishing gas and to protect precision equipment installed in a fire extinguishing target room. It is another object of the present invention to provide a flow straightening tube for a gas fire extinguishing facility and a gas fire extinguishing system including the same.

In order to solve the above problems, the present invention proposes the following means.
The flow straightening cylinder of the present invention is a flow straightening cylinder that is 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 has a pipeline that allows the fire fighting gas from the gas pipe to pass therethrough. A plurality of grooves extending from one opening end of the conduit to the other opening end are formed on the inner peripheral surface of the conduit, and the plurality of grooves are parallel to each other along the longitudinal direction thereof. It is arranged in the circumferential direction of the inner peripheral surface.

  According to this flow straightening cylinder, in a state where one open end of the pipe line is connected to the supply port of the gas pipe, the fire extinguishing gas that has entered the pipe of the flow straightening pipe from the supply port of the gas pipe is transferred to the other pipe line. Flows towards the open end. At this time, the fire-extinguishing gas is rectified so as to flow along the longitudinal direction of the groove formed on the inner peripheral surface of the pipe, and thereby the straightness of the flow (airflow) of the fire-extinguishing gas along the longitudinal direction of the groove is increased. It will be. This rectification phenomenon of the fire extinguishing gas is particularly noticeable in the vicinity of the inner peripheral surface of the pipe.

  Therefore, it is possible to suppress turbulence in the airflow flowing out from the other opening end of the duct into the target chamber, and as a result, a vortex based on the interference between the air in the target chamber and the fire extinguishing gas is generated in the vicinity of the other opening end. This can be suppressed. In other words, it is possible to suppress the occurrence of turbulent flow based on the interference between the air in the target room and the fire extinguishing gas in the vicinity of the other opening end of the pipe line, and to reduce turbulent flow noise.

In the rectifying cylinder, each groove may extend, for example, along the axis of the pipeline, or may extend, for example, in a spiral shape with the axis of the pipeline as the center.
In this way, when the groove extends in a certain direction along the inner peripheral surface of the pipe, the straightness of the airflow in the pipe can be particularly increased. For example, when the groove extends in a spiral shape, a torsional moment is applied to the airflow in the pipeline, whereby the airflow is rectified into a spiral flow, and as a result, the straightness of the airflow increases.

  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 fire-extinguishing gas into the target chamber; and the rectifying cylinder, wherein the rectifying cylinder is detachably attached to a supply port of the gas pipe that opens into the target chamber. It is characterized by.

  In this gas fire extinguishing system, 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 rectifying cylinder. And according to this invention, the turbulent noise mentioned above can be reduced at low cost only by attaching a rectification | straightening pipe | tube to the supply port of gas piping.

  ADVANTAGE OF THE INVENTION According to this invention, even if a high pressure fire extinguishing gas is jetted from a supply port of gas piping toward a target room at a high speed, turbulent flow can be prevented and noise energy can be reduced by the flow straightening tube having grooves.

It is the schematic which shows the gas fire extinguishing system which concerns on one Embodiment of this invention. It is sectional drawing which shows the rectification | straightening cylinder with which the gas fire extinguishing system of FIG. 1 is equipped. It is AA arrow sectional drawing of FIG. It is sectional drawing which shows the modification of a rectification | straightening cylinder. It is a schematic sectional drawing which shows the structural example of the gas piping of a gas fire extinguishing system.

Hereinafter, an embodiment of the present invention will be described 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 rectifying cylinder 30 connected to a 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 FIGS. 2 and 3, the flow straightening 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 conduit 31 of the rectifying 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 L <b> 3 of the conduit 31 is integrally formed at one open end 31 a of the conduit 31. The rectifying cylinder 30 is connected to the supply port of the gas pipe 22 by inserting the nozzle part 25 of the gas pipe 22 into the connecting cylinder part 32. 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 plurality of grooves 33 extending from one open end 31 a of the pipe 31 to the other open end 31 b are formed on the inner peripheral surface 31 c of the pipe 31. Each groove 33 extends linearly along the axis L <b> 3 of the pipe line 31. Moreover, the some groove | channel 33 is arranged at equal intervals in the circumferential direction of the pipe line 31 so that it may mutually parallel along the longitudinal direction.
The rectifying cylinder 30 having the above-described configuration may be integrally fixed or integrally formed with the supply port of the gas pipe 22, but is more preferably attached detachably to the supply port of the gas pipe 22.

  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 rectifying cylinder 30.
Here, the flow of the fire extinguishing gas passing through the pipe 31 of the rectifying cylinder 30 will be described in detail. The fire extinguishing gas that has entered the pipe 31 of the rectifying cylinder 30 from the supply port of the gas pipe 22 is the other of the pipe 31. It flows toward the open end 31b. At this time, the fire extinguishing gas is rectified so as to flow along the longitudinal direction of the groove 33 formed in the inner peripheral surface 31 c of the pipe line 31. More specifically, since each groove 33 extends linearly along the axis L3 of the pipeline 31, the flow of the fire extinguishing gas (air flow) is rectified into a linear flow along the axis L3 of the pipeline 31. As a result, the straightness of the airflow increases. This rectification phenomenon of the fire extinguishing gas is particularly noticeable in the vicinity of the inner peripheral surface 31c of the pipe 31.

Therefore, according to the flow straightening cylinder 30 of the present embodiment, the flow of the fire extinguishing gas blown into the target chamber 3 in the flow straightened state as described above is suppressed, and as a result, Occurrence of a vortex based on interference between the fire extinguishing gas and the air in the target chamber 3 in the vicinity of the other opening end 31b can be suppressed. In other words, in the vicinity of the other opening end 31 b of the pipe line 31, it is possible to suppress the occurrence of turbulent flow based on the interference between the fire extinguishing gas and the air in the target chamber 3, and to reduce the energy of turbulent noise.
And in the gas fire extinguishing system 1 of this embodiment, when the rectification | straightening cylinder 30 is made detachable with respect to the supply port of the gas piping 22, it only attaches the rectification cylinder 30 to the supply port of the conventionally well-known gas piping 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 under floor area | region 15, the apparatus installation area | region 16, and the ceiling area | region 17 in the target room 3, these several area | region 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.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the groove 33 formed in the pipe line 31 is not limited to extending along the axis L3 of the pipe line 31 and is formed to extend from at least one opening end 31a of the pipe line 31 to the other opening end 31b. It is sufficient that the plurality of grooves 33 are arranged in the circumferential direction of the inner circumferential surface 31c so as to be parallel to the longitudinal direction. Therefore, the groove 33 formed in the pipe line 31 may extend in a spiral shape around the axis L3 of the pipe line 31 as shown in FIG. Even in this configuration, it is possible to increase the straightness of the flow (airflow) of the fire extinguishing gas along the longitudinal direction of the groove 33. More specifically, the torsional moment is given to the airflow in the pipeline 31 by the spiral groove 33, whereby the airflow is rectified into a spiral flow, and as a result, the straightness of the airflow increases. In addition, although the helical groove | channel 33 in FIG. 4 is made into the equal pitch, it may be an unequal pitch, for example.

  Further, the pipe line 31 of the rectifying cylinder 30 is not limited to be formed in a straight line shape, and may be bent or curved in the middle portion, for example. Even in this case, the groove 33 formed in the pipe line 31 extends along the axis L3 of the bent or curved pipe line 31 or is spiral with the axis L3 of the bent or curved pipe line 31 as the center. It is possible to form so that it may extend. And even if it is the groove | channel 33 of such a shape, it is possible to rectify | straighten so that the advancing property of an airflow may be increased.

  Further, when a high-speed flow occurs in the gas pipe 22, resonance occurs in the gas pipe 22 itself, and noise based on this vibration may reach the precision device 2 and have an adverse effect. For this reason, for example, the natural frequency of the gas pipe 22 is changed on the outer peripheral surface of the gas pipe 22 as shown in FIG. 5 (particularly, the natural frequency of the gas pipe 22 located in the target chamber 3 is changed). The cylindrical sleeve 40 may be fixed. Such a sleeve 40 may be made of, for example, a material different from that of the gas pipe 22. In addition, although the sleeve 40 of the example of illustration is provided over the inside and outside of the object chamber 3, it may be provided only in the object chamber 3, for example.

In this configuration, the sleeve 40 can shift the resonance frequency of the gas pipe 22 from the frequency of the noise band that affects the precision device 2 (for example, the natural frequency of the precision device 2). For this reason, even if the vibration based on the resonance of the gas pipe 22 reaches the precision device 2, it is possible to prevent the precision device 2 from being defective.
The sleeve 40 may be made of any material such as a metal material, but is more preferably made of a material having sound absorbing performance such as a resin material such as urethane. In this case, since noise generated in the gas pipe 22 and the vicinity thereof can be absorbed, the precision instrument 2 can be further protected.

  The gas fire extinguishing system 1 of the present invention is not limited to the fire extinguishing of the target room 3 divided into a plurality of areas by the floor board 13 and the top board 14, for example, the target room of only one area without the floor board 13 or the top board 14. It can also be applied to fire extinguishing 3. Further, the gas fire extinguishing system 1 of the present invention is not limited to extinguishing the fire in the target room 3 in which the precision device 2 is arranged, but can be applied to extinguishing other target rooms such as a clean room.

DESCRIPTION OF SYMBOLS 1 Gas fire extinguishing system 2 Precision apparatus 3 Target chamber 21 Gas supply source 22 Gas piping 23 Supply control valve 30 Rectification cylinder 31 Pipe 31a One opening end 31b The other opening end 31c Inner peripheral surface 33 Groove L2 Axis L3 Axis

Claims (4)

A rectifier cylinder 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 having a conduit for passing the fire extinguishing gas from the gas pipe,
A plurality of grooves extending from one opening end of the conduit to the other opening end are formed on the inner peripheral surface of the conduit,
The plurality of grooves are arranged in the circumferential direction of the inner peripheral surface so as to be parallel to each other along the longitudinal direction thereof.   The rectifying cylinder according to claim 1, wherein the groove extends along an axis of the pipe line.   The rectifying cylinder according to claim 1, wherein the groove extends in a spiral shape around the axis of the pipe line. 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 the flow straightening cylinder according to any one of claims 1 to 3,
The gas fire extinguishing system, wherein the rectifying cylinder is detachably attached to a supply port of the gas pipe that opens into the target chamber.

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