JP2011115340A - Jet head, and gas fire extinguishing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet head capable of reducing the noise based on the supply of fire extinguishing gas, and to provide a gas fire extinguishing system equipped with the same. <P>SOLUTION: The jet head 41 is connected to a nozzle 31 for supplying the fire extinguishing gas into a target chamber to jet the fire extinguishing gas flowing through the nozzle 31 and includes: a chamber 44 having the jet port 47 communicating with the outflow port of the nozzle 31 and opened toward the target chamber; and a damper mechanism 51 for damping the pressure fluctuation in the chamber 44. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an ejection head and a gas fire extinguishing system including the ejection head.

Conventionally, as a gas fire extinguishing system that extinguishes a fire generated in a target room, there is a system that fills a target room with a fire extinguishing gas composed of an inert gas or a non-flammable gas such as nitrogen gas, carbon dioxide gas, and halogen gas (for example, Patent Document 1). Such a gas fire extinguishing system 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 system, the outlet opening in the target chamber is made into a nozzle shape with a narrowed cross section so that a large amount of fire extinguishing gas can be filled in the target chamber in a short time. High-pressure fire extinguishing gas is ejected from the outlet at high speed.

JP 2000-60984 A

However, in the above-described gas fire extinguishing system, since the gas pressure is suddenly released when the high pressure fire extinguishing gas is ejected from the outlet to the target chamber, the fire extinguishing gas rapidly expands, and a very large expansion sound is generated. May occur.
Moreover, in order to fill the target room with fire-extinguishing gas in a short time, the fire-extinguishing gas is ejected from the outlet at high speed, but if this ejection flow velocity partially exceeds the speed of sound, a shock wave is generated. Noise may occur.

  Accordingly, the present invention has been made in view of such circumstances, and provides an ejection head capable of reducing noise based on the supply of a fire extinguishing gas, and a gas fire extinguishing system including the same. With the goal.

In order to solve the above problems, the present invention provides the following means.
The ejection head according to the present invention is an ejection head that is connected to an outlet of a gas pipe for supplying a fire extinguishing gas into a target chamber and ejects the fire extinguishing gas flowing through the gas pipe, and communicates with the outlet. And a chamber having a jet opening that opens into the target chamber, and a damper mechanism that attenuates pressure fluctuations in the chamber.

According to this configuration, when the target room is extinguished, the fire extinguishing gas expands by flowing into the chamber of the ejection head from the outlet of the gas pipe, and the damper mechanism absorbs the pressure fluctuation in the chamber due to the expansion. Can be attenuated. Therefore, the sound pressure energy based on the expansion sound generated when the fire extinguishing gas is released can be attenuated, and the noise generated in the target room can be reduced.
In addition, even if a shock wave is generated due to the gas flow velocity when the fire extinguishing gas is ejected from the outlet, the sound pressure energy of the noise based on the shock wave can be absorbed and attenuated by the damper mechanism. It is possible to reduce the noise generated due to the ejection of the gas. Thereafter, the fire extinguishing gas is ejected into the target chamber after the sound pressure energy of the noise is attenuated, so that only the noise can be reduced without reducing the gas flow velocity and pressure.
Thus, since the sound pressure energy due to the expansion sound and the increase in gas flow rate can be effectively absorbed by the damper mechanism, the noise based on the supply of the fire extinguishing gas can be reduced in a wide band.

  The chamber communicates with the outlet on the upstream side, and is disposed so as to cover the inner cylinder opened on the downstream side and the open end of the inner cylinder, and the outer cylinder formed with the jet outlet. And the damper mechanism is connected to the outer cylinder and the inner cylinder, and urges the outer cylinder and the inner cylinder in a direction in which the outer cylinder and the inner cylinder approach each other, and a biasing force of the elastic member And a resistance member that attenuates.

According to this configuration, when pressure fluctuation occurs in the chamber, the outer cylinder is pressed toward the downstream side in the flow direction, that is, in the direction against the urging force of the elastic member. Then, the elastic member and the resistance member extend along the flow direction of the fire extinguishing gas, and the outer cylinder gradually moves toward the downstream side in the flow direction with respect to the inner cylinder. Thereby, the volume in a chamber expands and the energy accompanying a pressure fluctuation is absorbed in a chamber. As a result, sound pressure energy based on the expansion sound generated when the fire extinguishing gas is released can be attenuated, and noise generated in the target room can be reduced.
In this case, since the inner cylinder and the outer cylinder are connected by the resistance member, the energy acting in the chamber can be effectively attenuated by the resistance member. That is, the resistance member becomes a resistance during the expansion and contraction operation of the elastic member, and energy input to the elastic member can be reduced, so that the convergence of the periodic vibration due to the energy absorbed when the elastic member is extended can be accelerated.

  Further, a sound absorbing member is provided on the inner wall surface of the chamber.

  According to this configuration, the sound pressure energy due to the expansion sound and the increase in gas flow rate can be absorbed by the sound absorbing member, so that noise based on the supply of the fire extinguishing gas can be further reduced.

  In addition, a sleeve made of a vibration isolating material is fixed to the outer peripheral surface of the gas pipe.

  According to this configuration, it is possible to absorb noise generated in the gas pipe and the vicinity thereof.

  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 chamber; and the ejection head according to the present invention, wherein the ejection head is an outlet of the gas piping. It is attached to.

  According to this configuration, noise can be reduced only by attaching the ejection head of the present invention to a known gas pipe. For this reason, it is possible to suppress an increase in equipment cost without a significant change in the gas fire extinguishing system.

According to the ejection head of the present invention, noise based on the supply of fire extinguishing gas can be reduced.
According to the gas fire extinguishing system of the present invention, noise can be reduced only by attaching the ejection head of the present invention to a known gas pipe. For this reason, it is possible to suppress an increase in equipment cost without a significant change in the gas fire extinguishing system.

It is a schematic structure figure of a fire extinguishing system in an embodiment of the present invention. It is principal part sectional drawing in embodiment of this invention. It is sectional drawing equivalent to FIG. 2, and is explanatory drawing for demonstrating the effect | action of embodiment. It is sectional drawing of gas piping.

Next, embodiments of the present invention will be described with reference to the drawings.
(Gas fire extinguishing system)
FIG. 1 is a schematic configuration diagram showing a gas fire extinguishing system.
As shown in FIG. 1, the gas fire extinguishing system 10 of the present embodiment performs fire extinguishing in a target room 12 in which a precision device 11 such as a large computer is installed, and the fire extinguishing system installed outside the target room 12. A gas supply source (gas supply source) 21, a gas pipe 22 that communicates the supply source 21 with the inside of the target chamber 12 and guides the extinguishing gas supplied from the supply source 21 into the target chamber 12, and a fire notification (not shown) And a control unit (not shown) that opens and closes the control valve 23 connected to the gas pipe 22 based on a fire signal output from the vessel.

  The target room 12 of the present embodiment is a so-called double room in which the top plate 15 is arranged with a space between the ceiling 14 and the floor plate 16 is arranged with a space between the floor 13. It has a floor and double ceiling structure. Specifically, a space surrounded by the ceiling 14 and the top board 15 is a ceiling area 17, and a space surrounded by the floor 13 and the floor board 16 is a floor area 18, and a space surrounded by the top board 15 and the floor board 16. The equipment installation area 19 is configured, and the precision equipment 11 described above is installed on the floor plate 16 of the equipment installation area 19. The floor plate 16 and the top plate 15 are not limited to be provided so as to completely block the regions 17 to 19, and are provided so that the regions 17 to 19 communicate with each other as illustrated. Also good.

  The supply source 21 is constituted by a pressure vessel such as a gas cylinder for storing 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 (three in the illustrated example) of outlets of the gas pipe 22 are opened in the target chamber 3. is doing. The plurality of outlets 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 this embodiment, the gas pipe 22 is connected to a supply pipe 22a connected to the supply source 21, a plurality of branch pipes 22b branched from the downstream end of the supply pipe 22a, and a downstream end of each branch pipe 22b. A plurality of ejection pipes 22 c that are connected and open from the side wall 25 of the target room 12 into the ceiling region 17, the device installation region 19, and the underfloor region 18 are provided. Moreover, although the control valve 23 of this embodiment is connected to the supply piping 22a formed by gathering the gas piping 22, it is not limited to this and may be connected to the branch piping 22b or the ejection piping 22c.

  Further, the side wall 27 facing the side wall 25 of the device installation area 19 is opened when the pressure in the target chamber 12 becomes equal to or higher than a predetermined pressure, and gas (fire extinguishing gas or air) filling the target chamber 12 is filled. A pressure avoidance opening damper 26 for escaping to the outside of the target chamber 12 is formed. In this way, by arranging the pressure relief damper 26 at a position facing the ejection pipe 22c from which the fire extinguishing gas is ejected, the entire target chamber 12 can be easily filled with the fire extinguishing gas.

FIG. 2 is a cross-sectional view showing the main part of the present embodiment. Since the downstream side of each ejection pipe 22c has the same configuration, the following explanation will be made on the downstream side of one ejection pipe 22c.
As shown in FIG. 2, an orifice-shaped nozzle (outlet) 31 for accelerating the flow of the fire-extinguishing gas ejected from the ejection pipe 22c is attached to the downstream end of each ejection pipe 22c. The nozzle 31 extends along the axial direction of the ejection pipe 22c (the flow direction of the fire extinguishing gas), and the fire extinguishing gas that circulates through the ejection pipe 22c circulates through the nozzle 31 so that the fire extinguishing gas can be supplied at a higher speed. It can be ejected into the target chamber 12.

(Jet head)
Here, an ejection head 41 for ejecting fire extinguishing gas into the target chamber 12 is attached to the downstream end of the nozzle 31. The ejection head 41 includes a cylindrical coupling portion 42 that is coupled so as to cover the downstream end of the nozzle 31 from the outside, and a head body 43 that is formed at the downstream end of the coupling portion 42.

  The head main body 43 includes a chamber 44 that communicates with the connecting portion 42. The chamber 44 has a cylindrical shape that is larger than the inner diameter of the connecting portion 42, and is formed so as to cover the inner tube 45 connected to the connecting portion 42 and the open end on the downstream side of the inner tube 45. The outer cylinder 46 is divided. That is, the chamber 44 functions as an expansion chamber that temporarily expands in the previous stage in which the fire extinguishing gas flowing from the nozzle 31 is jetted into the target chamber 12.

  The inner cylinder 45 is a bottomed cylindrical member extending so that the axial direction coincides with the flow direction. The inner cylinder 45 communicates with the connecting portion 42 at the center of the upstream end face, while the upstream side is opened. ing. Further, a flange portion 48 is formed on the outer wall surface of the inner cylinder 45 so as to project outward in the radial direction, and an elastic member 52 of a damper mechanism 51 described later is connected to the flange portion 48.

The outer cylinder 46 is a bottomed cylindrical member having an inner diameter larger than the outer diameter of the inner cylinder 45, and the upstream side is opened, while the downstream end face opens into the target chamber 12. A spout 47 is formed. That is, the inside of the chamber 44 and the target room 12 communicate with each other through the jet port 47. The inner diameter of the nozzle 31 and the inner diameter of the ejection port 47 are formed to be equal.
And the outer cylinder 46 is arrange | positioned so that the open end of the inner cylinder 45 may be covered from a downstream in the state which made the axial direction correspond to the axial direction of the inner cylinder 45, and the inner cylinder 45 is followed along the distribution direction of fire extinguishing gas. Is configured to be movable. That is, in the ejection head 41 of the present embodiment, the volume in the chamber 44 varies as the outer cylinder 46 moves based on the pressure variation in the chamber 44.

  Here, the inner cylinder 45 and the outer cylinder 46 are connected by a damper mechanism 51. Specifically, the damper mechanism 51 includes a resistance member 53 that connects the outer cylinder 46 and the inner cylinder 45 inside the chamber 44, and a plurality of elastic members 52 that connects the outer cylinder 46 and the inner cylinder 45 outside the chamber 44. It has.

  The resistance member 53 is composed of an elastic body having high impact absorption while having low impact resilience, such as sponge and low-rebound rubber, and the end surface on one end side of the resistance member 53 is an opening on the downstream side of the inner cylinder 45. While being connected to the edge, the end surface on the other end side is connected to the inner wall surface on the downstream side of the outer cylinder 46.

  A plurality of elastic members 52 are arranged along the circumferential direction on the outer peripheral wall of the inner cylinder 45, and one end is connected to the flange portion 48 of the inner cylinder 45, while the other end is upstream of the outer cylinder. It is connected to the opening edge on the side. The elastic member 52 urges the inner cylinder 45 and the outer cylinder 46 in a direction in which the inner cylinder 45 and the outer cylinder 46 approach each other along the flow direction of the fire extinguishing gas (a direction in which the volume in the chamber 44 is reduced). In the fire extinguishing gas supply stop state (when the gas fire extinguishing system 10 is not used), the damper mechanism 51 has the elastic member 52 in a natural length and the resistance member 53 held in an uncompressed state. Further, the ejection head 44 of the present embodiment may be integrally fixed to the nozzle 31 or may be integrally formed, but it is more preferable that the ejection head 44 is detachably attached to the nozzle 31.

(Operation method of gas fire extinguishing system)
Next, the operation | movement method of the gas fire extinguishing system of this embodiment is demonstrated. In addition, the arrow F in a figure has shown the flow of fire extinguishing gas. Further, when the gas fire extinguishing system 10 is not used, the elastic member 52 is in a natural length, the resistance member 53 is held in an uncompressed state, and the volume in the chamber 44 is minimized.
First, when a fire alarm detects a fire in the target room 12, a fire signal is output from the fire alarm to the control unit. When the control unit receives the fire signal, the control unit starts the gas fire extinguishing system 10. Specifically, the control unit opens the control valve 23 to supply the fire extinguishing gas from the supply source 21 toward the gas pipe 22.

  The fire extinguishing gas supplied from the supply source 21 circulates in the gas pipe 22 (supply pipe 22a, branch pipe 22b, and jet pipe 22c), and is accelerated by flowing through the nozzle 31. It flows into the chamber 44. The fire extinguishing gas is ejected into the target chamber 12 from the ejection hole 47 of the chamber 44.

  Here, the fire extinguishing gas expands by flowing from the nozzle 31 into the chamber 44 of the ejection head 41, and the damper mechanism 51 can absorb and attenuate the pressure fluctuation in the chamber 44 due to this expansion. Specifically, as shown in FIG. 3, when the pressure fluctuation occurs in the chamber 44 due to the expansion of the fire extinguishing gas, the expansion force causes the outer cylinder 46 to resist the urging force of the elastic member 52 on the downstream side in the flow direction. It will be pressed toward the direction to do. Then, the elastic member 52 and the resistance member 53 extend along the flow direction of the fire extinguishing gas, and the outer tube 46 gradually moves toward the downstream side in the flow direction with respect to the inner tube 45. Thereby, the expansion force is absorbed in the chamber 44 by expanding the volume in the chamber 44. As a result, the sound pressure energy based on the expansion force generated when the fire extinguishing gas is released can be attenuated, and the noise generated in the target chamber 12 can be reduced.

  In this case, since the inner cylinder 45 and the outer cylinder 46 are connected by the resistance member 53, the expansion force acting in the chamber 44 can be effectively attenuated by the resistance member 53. That is, the resistance member 53 becomes a resistance when the elastic member 52 is expanded and contracted, and the expansion force input to the elastic member 52 can be attenuated. You can expedite.

  Further, even when a shock wave is generated due to the gas flow velocity when the fire extinguishing gas is ejected from the nozzle 31, the outer cylinder 46 moves relative to the inner cylinder 45 by the operation of the damper mechanism 51 described above. By doing so, the shock caused by the shock wave can be absorbed and attenuated. Thereby, the sound pressure energy of the noise based on the ejection of the fire extinguishing gas can be absorbed. Thereafter, the fire extinguishing gas is jetted into the target chamber 12 from the jet port 47 formed to be equivalent to the inner diameter of the nozzle 31. Therefore, only noise can be reduced without reducing the gas flow rate and pressure.

  As a result, the fire extinguishing gas passes through the ejection hole 47 from the chamber 44 and is ejected into the target chamber 12 and supplied to the entire target chamber 12. Thereafter, the fire in the target chamber 12 can be extinguished by continuing to supply the fire extinguishing gas from the ejection head 41 into the target chamber 12 and filling the target chamber 12 with the fire extinguishing gas. If the extinguishing gas continues to be supplied and the pressure in the target chamber 12 exceeds a predetermined pressure, the pressure relief damper 26 is opened so that the gas in the target chamber 12 automatically escapes to the outside. It has become. In addition, when the gas flow rate is lowered, for example, when the gas supply is stopped, the expansion force acting in the chamber 44 is reduced, and the elastic member 52 and the resistance member 53 are gradually restored. As a result, the outer cylinder 46 moves toward the upstream side in the flow direction, and the volume in the chamber 44 is reduced.

As described above, in this embodiment, the ejection head 41 is attached to the downstream end of the nozzle 31, and the damper mechanism 51 that attenuates the pressure fluctuation in the chamber 44 is provided in the chamber 44 of the ejection head 41.
According to this configuration, as described above, the noise caused by the expansion when the fire extinguishing gas is opened from the orifice hole 45 and the noise caused when the fire extinguishing gas is ejected are reduced without reducing the gas flow rate. Can do. Therefore, noise based on the supply of fire extinguishing gas can be reduced.

  By the way, when the control valve 23 is opened, a shock wave (pressure wave) is generated due to a pressure difference (pressure fluctuation) between the upstream side and the downstream side of the control valve 23 in the gas pipe 22. Then, the shock wave propagates through the gas pipe 22 (the supply pipe 22a, the branch pipe 22b, and the ejection pipe 22c) and the nozzle 31 together with the fire extinguishing gas and into the chamber 44.

  Here, the shock wave propagating through the nozzle 31 is attenuated by diffracting when propagating through the nozzle 31 and propagating into the chamber 44. Further, the shock wave propagated into the chamber 44 is attenuated by the operation of the damper mechanism 51, passes through the ejection hole 47, is diffracted again, and propagates into the target chamber 12. As described above, the shock wave is attenuated step by step before being propagated into the target chamber 12. That is, since the expansion of the shock wave is performed in stages, the noise due to the shock wave generated when the control valve 23 is opened can be reduced.

  Moreover, in the gas fire extinguishing system of this embodiment, since the ejection pipe 22c is opened in each area | region of the ceiling area | region 17, the underfloor area | region 18, and the apparatus installation area | region 19 in the object room 12, it fires in any of these several area | regions. Even if this occurs, the fire extinguishing gas can be filled in a shorter time.

  Further, in the gas fire extinguishing system 10 of the present embodiment, the fire is extinguished by filling the target room 12 with the fire extinguishing gas, but the pressure in the target room 12 is increased by the fire extinguishing gas supplied into the target room 12. May rise. Here, since the gas fire extinguishing system of the present embodiment includes the pressure avoidance opening damper 26, excessive pressure can be released outside the target chamber 12.

  When the ejection head 41 is configured to be detachable with respect to the nozzle 31, noise can be reduced by simply attaching the ejection head 41 to the known nozzle 31. For this reason, it is possible to suppress an increase in equipment cost without a significant change in the gas fire extinguishing system.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
The inner wall surface of the ejection head 41 is not limited to the same finishing as the inner surface of the gas pipe 22, and necessary members can be added. For example, a configuration in which a sound absorbing member such as glass wool is disposed on the inner wall surface of the chamber 44 is also possible. According to this configuration, since the energy acting in the chamber 44 with the shock wave and the increase in the ejection amount is absorbed by the sound absorbing member, the sound pressure energy of the noise can be attenuated more effectively. As a result, noise based on the supply of fire extinguishing gas can be further reduced.

  Moreover, although embodiment mentioned above demonstrated the case where a damper mechanism was comprised with an elastic member and a resistance member, it is not restricted to this. For example, it is possible to adopt an elastic body having high impact absorption and high resilience, such as rubber, as the resistance member. When such a material is used, the elastic member may not be provided. .

  Furthermore, in the above-described embodiment, the configuration in which the opening / closing operation of the control valve 23 of the gas fire extinguishing system 10 is controlled by the control unit has been described. However, the present invention is not limited to this. I do not care.

  Further, when a high-speed flow occurs in the gas pipe 22, resonance occurs in the gas pipe 22 itself, and noise may be generated based on this vibration. Therefore, for example, as shown in FIG. 4, a sleeve 80 made of a vibration isolating material may be fixed to the outer peripheral surface of the gas pipe 22 (jet pipe 22 c). Although the sleeve 80 in the illustrated example is provided over the inside and outside of the target chamber 12, for example, it may be provided only in a region protruding into the target chamber 12.

  The sleeve 80 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, noise generated in the gas pipe 22 and the vicinity thereof can be absorbed.

  The gas fire extinguishing system 10 of the present invention is not limited to the fire extinguishing of the target room 12 divided into the plurality of regions 17 to 19 by the floor plate 16 or the top plate 15, for example, only one region without the floor plate 16 or the top plate 15. This can also be applied to extinguishing the target room 12. Moreover, the gas fire extinguishing system 10 of the present invention is not limited to the fire extinguishing in the target room 12 in which the precision device 11 is arranged, but can be applied to the fire extinguishing of another target room 12 such as a clean room.

10 ... Gas fire extinguishing system 12 ... Target room 21 ... Supply source (gas supply source)
22 ... Gas piping 31 ... Nozzle (outlet)
41 ... Ejection head 44 ... Chamber 45 ... Inner cylinder 46 ... Outer cylinder 51 ... Damper mechanism 52 ... Elastic member 53 ... Resistance member

Claims (5)

An ejection head connected to an outlet of a gas pipe for supplying a fire extinguishing gas into a target room, and ejecting the fire extinguishing gas flowing through the gas pipe;
A chamber having a jet opening that communicates with the outlet and opens toward the target chamber;
An ejection head comprising a damper mechanism for attenuating pressure fluctuation in the chamber. The chamber is
An inner cylinder communicating with the outlet on the upstream side, while being opened on the downstream side;
It is arranged so as to cover the open end of the inner cylinder, and is divided into an outer cylinder in which the jet port is formed,
The damper mechanism is
An elastic member coupled to the outer cylinder and the inner cylinder and biasing the outer cylinder and the inner cylinder toward each other;
The ejection head according to claim 1, further comprising a resistance member that attenuates a biasing force of the elastic member.   The ejection head according to claim 1, wherein a sound absorbing member is provided on an inner wall surface of the chamber.   The ejection head according to any one of claims 1 to 3, wherein a sleeve made of a vibration isolating material is fixed to an outer peripheral surface of the gas pipe. A gas supply source for storing fire extinguishing gas;
A gas pipe for supplying the fire extinguishing gas from the gas supply source into the target room;
A jet head according to any one of claims 1 to 4,
The gas fire extinguishing system, wherein the ejection head is attached to an outlet of the gas pipe.

Images