JP7141075B2 - Low wind velocity gas fire extinguishing system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-based fire extinguishing system that is applied to exhibition rooms and storehouses in art galleries, museums, etc. where cultural properties are exhibited or stored, for example.

Art galleries and museums exhibit a wide variety of exhibits, including paintings, pottery, and hanging scrolls. It is
Art galleries, museums, etc. acquire visitors by regularly or irregularly changing exhibits to satisfy the viewing needs of people with a wide variety of tastes.

By the way, the Fire Service Law requires the installation of fire extinguishing equipment in buildings of a certain size and other fire prevention objects. Equipment may be installed.
When a fire breaks out, the indoor fire hydrant system is activated and the fire is extinguished by spraying water on the part where the fire broke out. However, valuable exhibits may be damaged or destroyed by water pressure from water discharge or unclean water itself.
In addition, if an object that obstructs the water discharge near the fire, such as a display stand or the display itself, becomes an obstacle, the fire cannot be sufficiently discharged to the fire and the fire spreads, failing to extinguish the fire in the initial stage. There is
If the fire is extinguished by spraying water, the sprayed water will contain combustion products and contamination of the protected compartment itself, resulting in contamination of areas other than the fire breakout area. and costs.

Therefore, in exhibition rooms such as art galleries and museums, in order to prevent damage and destruction of valuable exhibits, gas-based fire extinguishing equipment that uses gas as an extinguishing agent instead of fire extinguishing equipment that uses water as an extinguishing agent More and more equipment is being installed.

By the way, as shown in FIG. 9, the conventional gas-based fire extinguishing equipment mainly includes an accumulator-type storage container that mainly stores the fire extinguishing agent, a container valve for opening the storage container, and a fire extinguishing agent that transports the extinguishing agent to the protective compartment. It consists of a pipe for extinguishing, a connecting pipe that connects the container valve and the pipe, and an injection head for spraying the extinguishing agent into the protected compartment.
When there are multiple protection compartments, a selection valve is installed in the middle of the piping leading to the storage container and each protection compartment in order to configure the piping route only for the protection compartment where the fire broke out in order to share the storage container. A starting gas container is provided for opening the valve.
By opening the start-up gas container for the protected compartment in which the fire occurred, the start-up gas in the start-up gas container opened the select valve for the protected compartment and was provided to the container valve of the storage container. Activate the container valve opener to open the reservoir.

By the way, gas-based fire extinguishing equipment currently in general use includes inert gas fire extinguishing equipment that uses inert gases such as nitrogen gas and carbon dioxide. One of the agents is nitrogen gas, which is considered to be relatively safe with low toxicity in consideration of the safety of personnel who fail to escape in the event of a fire.
A fire extinguishing system using nitrogen gas is called a nitrogen gas fire extinguishing system.

This nitrogen gas fire extinguishing equipment emits gas in a gaseous state from the injection head installed in the protected area, spreads to every corner of the protected area, and extinguishes the fire. By venting the gas out of the protected compartment by means of an exhaust system, the advantage is that the time and cost of restoration can be kept relatively low.

However, in the case of gas-based fire extinguishing equipment, including this nitrogen gas fire extinguishing equipment, the system emits the amount of extinguishing agent required for extinguishing the fire in a specified time in order to extinguish the fire by emitting extinguishing agent before the fire spreads. Due to the design needs, the radiation of the extinguishing agent tends to create higher wind speeds within the guarded compartment.
When the wind speed is high, valuable exhibits such as hanging scrolls and paintings may sway and fall from fixed positions. In addition, the dust blown up by the wind speed, the adhesion of dirt caused by the dust, and the vibrations that occur directly and indirectly also damage the exhibits.

For this reason, as shown in FIG. 8(a), the injection head 10A attached to the pipe 4 is provided with a single orifice 2 for adjusting the radial flow rate, or as shown in FIG. 4, the orifice 2 is divided into a plurality of parts, and the flow rate of the fire extinguishing agent handled by each orifice 2 is reduced, and a cone-shaped deflector (deflecting member ) 5, the fire extinguishing agent emitted from each orifice 2 on a substantially single axis collides with the deflector 5 once to attenuate the kinetic energy and scatter the extinguishing agent in multiple directions, thereby radiating the extinguishing agent. Alternatively, as shown in FIG. 8(c), the ejection head 10C attached to the pipe 4 is provided with a cone-shaped horn (diffusing member) 6, and the extinguishing agent gas is diffused by the horn (diffusing member). It is arranged to be diffused by the member ) 6 and released into the protected compartment.

However, with these countermeasures, there is a limit to the effect of reducing the wind speed due to the structure and configuration of the ejection heads 10A, 10B, and 10C. In order to reduce the radiation flow rate, it was necessary to install multiple small jet heads to reduce the wind speed, which complicated the structure of the equipment.
In addition, for valuable exhibits, the damage caused by the wind speed, such as shaking and vibration caused directly and indirectly by the wind speed, and the dust that is blown up and the adhesion of dirt caused by dust, is reduced, but not eliminated. Measures had to be taken to further reduce the wind speed.
In order to further reduce the wind speed that has been reduced by the above measures, measures such as installing a windbreak plate can be considered in addition to the measures taken by the ejection heads 10A, 10B, and 10C. The display position changes when the product is used, and the installation position of the injection head cannot be easily changed because it is connected to steel pipes laid in the ceiling. Due in part to restrictions, these measures were often difficult to implement.

In addition to the exhibition rooms of art galleries and museums, it is also necessary to reduce the effects of wind speed on fire extinguishing agents in storage rooms where exhibits are stored. .

In view of the above-mentioned problems of the conventional gas-based fire extinguishing equipment, the object of the present invention is to reduce the influence of the wind velocity generated by the radiation of the fire extinguishing agent on valuable exhibits as much as possible compared to the conventional injection head. It is to provide a low wind speed gas fire extinguishing system capable of

In order to achieve the above object, the low wind speed gas fire extinguishing system of the present invention provides a gas fire extinguishing equipment using fire extinguishing agent gas, in which wind speed suppressing means is installed in an injection head installed for discharging extinguishing agent gas into a protected section. It is characterized by having

In this case, the wind speed suppressing means can be composed of a wind speed suppressor provided in the ejection head.

Further, the wind speed suppressing means can be made of a fibrous or porous material through which gas can flow, which is disposed at the outlet of the orifice of the ejection head.

Then, the pore size of the fibrous or porous material can be changed in the gas flow direction, for example, the pore size of the fibrous or porous material can be made smaller in the gas flow direction.
In addition, the amount of extinguishing agent required for extinguishing the fire is calculated from the volume of the protective compartment and must be emitted within a specified time. It is possible to appropriately suppress the wind speed generated in the exhibition room regardless of the amount of fire extinguishing agent required for extinguishing the fire by appropriately installing a plurality of such units in the protection section.

According to the low wind speed gas-based fire extinguishing system of the present invention, in a gas-based fire extinguishing equipment using extinguishing agent gas, the jet head installed for discharging the extinguishing agent gas into the protection section is equipped with the wind speed suppressing means, thereby extinguishing the fire. The wind speed generated when the agent gas is released can be reduced, and the influence of the wind speed on valuable exhibits can be reduced.

Further, by constructing the wind speed suppressing means by the wind speed suppressor provided in the ejection head, the wind speed suppressing means can be easily installed, and the required degree of wind speed suppression, installation state, etc. Since the wind speed suppressor can be designed together, the required wind speed suppression performance can be reliably obtained.
In addition, by disposing a wind speed suppressor in the ejection head as a wind speed suppression means, it is not necessary to reduce the discharge flow rate of the extinguishing agent gas per ejection head for wind speed suppression. It is possible to suppress the increase in the number of injection heads installed when the discharge flow rate of the extinguishing agent gas per injection head is reduced, thereby reducing the construction cost of the low wind speed gas fire extinguishing system. can.

Further, the wind speed suppressing means is formed of a fibrous or porous material through which gas can flow, which is disposed at the outlet of the orifice of the ejection head, so that the structure of the wind speed suppressing means is simplified and the ejection head is made compact. It can be configured and can be applied to existing equipment as it is.

Then, by changing the pore size of the voids of the fibrous or porous material in the direction of gas flow, for example, by decreasing the pore size of the voids of the fibrous or porous material in the direction of gas flow, A wind speed suppression effect can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing a first embodiment of an injection head used in a low wind velocity gas fire extinguishing system of the present invention; FIG. 5 is an explanatory view showing a second embodiment of the jet head used in the low wind speed gas fire extinguishing system of the present invention; FIG. 10 is an explanatory view showing a third embodiment of the jet head used in the low wind speed gas fire extinguishing system of the present invention; FIG. 5 is an explanatory view showing a first modified embodiment of the third embodiment of the jet head used in the low wind velocity gas fire extinguishing system of the present invention; FIG. 10 is an explanatory view showing a second modified embodiment of the third embodiment of the jet head used in the low wind velocity gas fire extinguishing system of the present invention; FIG. 10 is an explanatory view showing a fourth embodiment of the jet head used in the low wind velocity gas fire extinguishing system of the present invention; FIG. 10 is an explanatory view showing a modified embodiment of the fourth embodiment of the jet head used in the low wind velocity gas fire extinguishing system of the present invention; It is explanatory drawing which shows the conventional injection head for gas-type fire extinguishing equipment. It is explanatory drawing which shows an example of a gas system fire extinguishing equipment. It is explanatory drawing which shows the Example of a test.

Hereinafter, embodiments of the low wind speed gas fire extinguishing system of the present invention will be described based on the drawings.

FIG. 1 shows a first embodiment of the jet head used in the low wind velocity gas fire extinguishing system of the present invention.
The injection head 1A used in this low wind speed gas fire extinguishing system is equipped with an orifice 2 in the injection head 1A connected to a pipe 4 to which extinguishing agent gas is supplied, and a wind speed suppressor 3A is arranged on the tip side thereof, The extinguishing agent gas is discharged into the protection compartment via this wind speed suppressor 3A.

In this embodiment, the wind speed suppressor 3A has a structure in which a large number of through-holes 31a are formed in the peripheral surface of an inner tube 31, which serves as a flow path for extinguishing agent gas, and an outer tube 32 covers the outer periphery thereof.
This wind speed suppressor 3A weakens the kinetic energy of the extinguishing agent gas to reduce the wind speed generated when the extinguishing agent gas is discharged.
That is, when the extinguishing agent gas that has passed through the orifice 2 of the injection head 1A is directly released into the atmosphere, the kinetic energy of the extinguishing agent gas is hardly attenuated, and accordingly a high wind speed is generated. In the ejection head 1A of the example, a large number of through holes 31a are formed in the peripheral surface of the inner tube 31, which is the flow path of the extinguishing agent gas, and the outer periphery is covered with the outer tube 32. While the extinguishing agent gas passes through the inner pipe 31, the kinetic energy is gradually attenuated, and a high wind speed is generated when the extinguishing agent gas is discharged into the atmosphere from the opening 31b formed at the tip of the inner pipe 31. can be reduced.

In this case, the size and number (opening ratio) of the through-holes 31a formed in the peripheral surface of the inner pipe 31 can be appropriately set according to the pressure and flow rate of the extinguishing agent gas.
In the space 33 formed between the inner tube 31 and the outer tube 32, metal wool such as glass wool, rock wool, steel wool, non-woven fabric of synthetic fibers or natural fibers, inorganic materials (metal , metal oxides, and metal hydroxides), synthetic resin foams, honeycomb structure rectifiers, etc. It can be filled with a porous, airflow-disturbing material or left empty.
Also, the outer tube 32 can be made of a sintered metal.

In this embodiment, the extinguishing agent gas is directly discharged from the opening 31b formed at the tip of the inner pipe 31 to the protective compartment. A deflector (deflecting member) 5 is provided, and the extinguishing agent gas discharged from an opening 31b formed at the tip of the inner tube 31 is deflected by the deflector (deflecting member) 5 and discharged to the protection compartment, or FIG. As shown in c), a cone-shaped horn (diffusing member) 6 is provided, and the fire extinguishing agent gas emitted from the opening 31b formed at the tip of the inner tube 31 is diffused by the horn (diffusing member) 6 for protection. It can also be designed to release into compartments.

According to the injection head 1A used in this low wind speed gas fire extinguishing system, the wind speed suppressor 3A is installed in the injection head 1A for discharging the extinguishing agent gas into the protection section in the gas-type fire extinguishing equipment using the extinguishing agent gas. By arranging, it is possible to reduce the wind velocity generated when the extinguishing agent gas is discharged.

The low-velocity gas fire-extinguishing system using the jet head 1A of the present embodiment eliminates the damage that occurs directly and indirectly due to the wind speed, such as shaking and vibration, dust that is blown up, and adhesion of dirt caused by dust. equipment can be reduced.

In addition, the wind speed suppressor 3A provided in the ejection head 1A can be easily installed as the wind speed suppressing means, and can be adjusted according to the required degree of wind speed suppression, the installation state, etc. Since the wind speed suppressor 3A can be designed, it is possible to reliably obtain the required wind speed suppression performance.

FIG. 2 shows a second embodiment of the jet head used in the low wind speed gas fire extinguishing system of the present invention.
The jet head 1B used in this wind speed gas fire extinguishing system is provided with an orifice 2 connected to a pipe 4 to which fire extinguishing agent gas is supplied, and a wind speed suppressor 3B is disposed on the tip side thereof. The extinguishing agent gas is discharged into the protection compartment via the wind speed suppressor 3B.

In this embodiment, the wind speed suppressor 3B has a hole communicating with the internal flow path 34 at the center so that the extinguishing agent gas is radially discharged from the internal flow path 34 serving as a flow path for the extinguishing agent gas. A plurality of disk-shaped plate members 35 having 35a are spaced apart by spacers (not shown) and fixed by bolts 37 to form a discharge channel 36 through which fire extinguishing agent gas is discharged in a radial direction. and
This wind speed suppressor 3B weakens the kinetic energy of the extinguishing agent gas to reduce the wind speed generated when the extinguishing agent gas is discharged.
That is, when the extinguishing agent gas that has passed through the orifice 2 of the ejection head 1B is directly discharged into the atmosphere, the kinetic energy of the extinguishing agent gas is hardly attenuated, and accordingly a high wind speed is generated. In the ejection head 1B of the example, a hole portion 35a communicating with the internal flow path 34 is provided at the center so that the extinguishing agent gas is radially discharged from the internal flow path 34 serving as a flow path for the extinguishing agent gas. A plurality of disk-shaped plate members 35 are spaced apart by spacers (not shown) and fixed with bolts 37 to form discharge channels 36 for radially discharging extinguishing agent gas. , the kinetic energy of the extinguishing agent gas that has passed through the orifice 2 is gradually attenuated while passing through the discharge passage 36, and a high wind speed is generated when the extinguishing agent gas is discharged from the discharge passage 36 into the atmosphere. can be reduced.

In this case, the size and number of the disk-shaped plate member 35 and the discharge channel 36 can be appropriately set according to the pressure and flow rate of the extinguishing agent gas.

Other actions of the jet head 1B used in the low wind velocity gas fire extinguishing system of this embodiment are the same as those of the jet head 1A used in the wind velocity gas fire extinguishing system of the first embodiment.

FIG. 3 shows a third embodiment of the jet head used in the low wind velocity gas fire extinguishing system of the present invention.
The injection head 1C used in this low wind velocity gas fire extinguishing system has a plurality of (in this embodiment, four) orifices opening laterally in the injection head 1C connected to a pipe 4 to which fire extinguishing agent gas is supplied. 2, a wind speed suppressor 3C is arranged so as to cover the outer periphery thereof, and the extinguishing agent gas is discharged into the protection compartment via this wind speed suppressor 3C.

In this embodiment, the wind speed suppressor 3C includes a cylindrical housing 38 provided around the orifice 2, and a filler 39a disposed in an opening 38a of the housing 38 serving as a flow path for the extinguishing agent gas. I am trying to configure it with
This wind speed suppressor 3C is designed to attenuate the kinetic energy while changing the traveling direction of the extinguishing agent gas in multiple directions, and to reduce the wind speed generated by finally releasing the extinguishing agent gas in one axial direction. is.
That is, when the extinguishing agent gas that has passed through the orifices 2 of the ejection head 1C is directly discharged into the atmosphere, the kinetic energy of the extinguishing agent handled by each orifice is hardly attenuated, and accordingly a high wind speed is generated. In the ejection head 1C of the present embodiment, the outer periphery of the orifice 2, which is the flow path of the extinguishing agent gas, is covered with the housing 38, and the opening 38a of the housing 38 is provided with the filler 39a. , the kinetic energy of the extinguishing agent gas that has passed through the orifice 2 is gradually attenuated while passing through the housing 38 and the filling material 39a. It is possible to reduce the occurrence of wind speed.

In this case, the filler 39a includes metallic wool such as glass wool, rock wool, and steel wool, non-woven fabrics of synthetic fibers and natural fibers, and inorganic materials (including metals, metal oxides, and metal hydroxides). A fibrous or porous material that eliminates airflow turbulence through which gas can flow, such as a porous body (including a sintered body and a granular body), a synthetic resin foam, and a rectifier with a honeycomb structure can be used.
In order to prevent the filler 39a from scattering, etc., the filler 39a is sandwiched between sandwiching plates 39b1 and 39b2 made of punching metal, expanded metal, sintered metal plate material, honeycomb structure rectifier, etc., depending on the material of the filler 39a. can be placed in any state.
In order to further enhance the effect of suppressing the wind speed, the inner circumference and/or the outer circumference of the housing 38 may be coated with a material that further attenuates kinetic energy, or the housing 38 may be made of sintered metal, if necessary. It can also consist of

Other actions of the low-velocity gas fire extinguishing system using the jet head 1C of this embodiment are the same as those of the low-velocity gas fire-extinguishing system using the jet head 1A of the third embodiment.
By the way, the arrangement form of the filling material 39a and the like of the injection head 1C used in the low wind speed gas fire extinguishing system of the third embodiment is not limited to that described in the third embodiment, but various forms as described below. can be adopted.

FIG. 4 shows a first modified embodiment of the third embodiment.
In the jet head 1C1 used in this low wind speed gas fire extinguishing system, the wind speed suppressor 3C1 is provided around a plurality of (in this embodiment, four) orifices 2 opening in the lateral direction. A cylindrical housing 38 having an opening 38a serving as a flow path for the chemical gas, and the orifice 2 are arranged in the housing 38 so as to cover the outer periphery of the opening facing the lateral direction with a small space provided. He is trying to comprise with the bottomed filler 39a1.

This wind speed suppressor 3C1 is designed to attenuate the kinetic energy while changing the traveling direction of the extinguishing agent gas in multiple directions, and to reduce the wind speed generated by finally releasing the extinguishing agent gas in one axial direction. is.
That is, when the extinguishing agent gas that has passed through the orifices 2 of the ejection head 1C1 is directly discharged into the atmosphere, the kinetic energy of the extinguishing agent handled by each orifice is large, and accordingly a high wind speed is generated. In the injection head 1C1, the outer circumference of the orifice 2, which is the flow path of the extinguishing agent gas, is covered with the housing 38 through the filling material 39a1. During this time, the kinetic energy is gradually attenuated, and it is possible to reduce the occurrence of a high wind speed when the air is released into the atmosphere from the opening 38a of the housing 38.

In this case, the filler 39a1 may be a fibrous or porous material that eliminates the turbulence of airflow through which gas can flow. (including metal hydroxides) can be suitably used.
Further, as shown in FIG. 4(b), a bottomed tubular shield 39c through which gas does not flow can be arranged in the lower part of the space formed between the orifice 2 and the filler 39a1.
As a result, the extinguishing agent gas that has passed through the orifice 2 of the injection head 1C1 is temporarily received by the shield 39c and then passed through the filler 39a1, thereby preventing damage to the filler 39a1 due to the pressure of the extinguishing agent gas. This prevents the extinguishing agent gas from smoothly passing through the filler 39a1.

Although it is possible not to form the space between the orifice 2 of the ejection head 1C1 and the filler 39a1, the formation of the space allows the extinguishing agent gas that has passed through the orifice 2 of the ejection head 1C1 to The extinguishing agent gas can be diffused by being discharged into the space formed between the orifice 2 of the injection head 1C1 and the filler 39a1 so that the extinguishing agent gas smoothly passes through the filler 39a1.

Other actions of the low-velocity gas fire extinguishing system using the jet head 1C1 of this embodiment are the same as those of the low-velocity gas fire-extinguishing system using the jet head 1C of the third embodiment.

FIG. 5 shows a second modified embodiment of the third embodiment.
In the jet head 1C2 used in this low wind speed gas fire extinguishing system, the wind speed suppressor 3C2 has a disc shape (or FIG. 8 A cylinder with an opening 38a that serves as a flow path for the extinguishing agent gas, provided on the outer periphery of the opening deflected in the lateral direction by providing a conical deflector (deflecting member) 5 (as shown in (b)). and a bottomed filler 39a1 disposed in the housing 38 so as to cover the outer circumference of the opening of the orifice 2 facing the horizontal direction.

Furthermore, in the ejection head 1C2, a fibrous or porous material (not shown) that eliminates turbulence in the airflow through which gas can flow is disposed at the outlet of the orifice 2 that opens downward, and a slit is formed around the material. etc. are formed to cover with a cover member 39d through which gas can flow.

In this case, the fibrous or porous airflow turbulence eliminating material through which the gas can flow is arranged as close as possible to the outlet of the orifice 2 so as not to create air turbulence causing air gaps. preferably.

This wind speed suppressor 3C2 is designed to attenuate the kinetic energy while changing the traveling direction of the extinguishing agent gas in multiple directions, and to reduce the wind speed generated by finally releasing the extinguishing agent gas in one axial direction. is.
That is, when the extinguishing agent gas that has passed through the orifices 2 of the ejection head 1C2 is directly released into the atmosphere, the kinetic energy of the extinguishing agent handled by each orifice is large, and accordingly a high wind speed is generated. In the injection head 1C2, a fibrous or porous material that eliminates turbulence of the airflow through which the gas can flow is disposed at the outlet of the orifice 2 that opens downward, which is the flow path of the extinguishing agent gas. Since the outer periphery of the opening facing the direction is covered with the housing 38 via the filler 39a1, the extinguishing agent gas that has passed through the orifice 2 is a material that eliminates the turbulence of the fibrous or porous airflow through which the gas can flow. And the kinetic energy is gradually attenuated while passing through the filler 39a1, and the generation of high wind speed when discharged into the atmosphere from the opening 38a of the housing 38 can be reduced.

In this case, the filler 39a1 may be a fibrous or porous material that eliminates the turbulence of airflow through which gas can flow. (including metal hydroxides) can be suitably used.
In addition, fibrous or porous fibrous or porous materials through which gas can flow, disposed at the outlet of the downwardly opening orifice 2 serving as a flow path for the extinguishing agent gas, for eliminating turbulence in the airflow include glass wool, rock wool, and steel. A porous body made of metal wool such as wool or a sintered body of an inorganic material (including metals, metal oxides, and metal hydroxides) having high shape retention performance can be preferably used.
For the cover member 39d, a perforated metal, an expanded metal, a sintered metal plate, a honeycomb rectifier, or the like can be used depending on the material of fibrous or porous material that eliminates the turbulence of the airflow through which the gas can flow. Although it can be used, it can also be omitted depending on the quality of the fibrous or porous material that eliminates the turbulence of the gas flow.

Further, as shown in FIG. 5B, a space can be formed between the orifice 2 of the ejection head 1C2 and the filler 39a1.
As a result, the extinguishing agent gas that has passed through the orifice 2 of the ejection head 1C2 is released into the space formed between the orifice 2 of the ejecting head 1C2 and the filler 39a1, thereby diffusing the extinguishing agent gas. can be passed smoothly.

Other actions of the low-velocity gas fire extinguishing system using the jet head 1C2 of this embodiment are the same as those of the low-velocity gas fire-extinguishing system using the jet head 1C of the third embodiment.

Similarly, only the structure in which a fibrous or porous material that eliminates turbulence in the airflow through which gas can flow is arranged at the outlet of the orifice 2 shown in the second modified embodiment of the third embodiment (cylindrical shape) , the housing 38 is omitted.) can be used to obtain the effect of suppressing the wind speed.

In this case, the fibrous or porous airflow turbulence eliminating material through which the gas can flow is arranged as close as possible to the outlet of the orifice 2 so as not to create air turbulence causing air gaps. preferably.

More specifically, as shown in FIG. 6, a fibrous or porous material 7 that eliminates turbulence in the airflow through which gas can flow is arranged at the outlet of the orifice 2 of the ejection heads 1I and 1J. 2, the extinguishing agent gas gradually attenuates kinetic energy while passing through the fibrous or porous material 7 that eliminates the turbulence of the airflow through which the gas can flow, and has a high wind speed when released into the atmosphere. can reduce the occurrence of

Here, the ejection head 1I shown in FIG. 6(a) is provided with a plurality of (six in this embodiment) orifices 2, and the exits thereof are disk-shaped (or as shown in FIG. 8(b)). 6(b), an ejection head 1J shown in FIG. is provided.
The types of ejection head and orifice are not limited to those of this embodiment.

In this case, the fibrous or porous material 7 that eliminates turbulence of airflow through which gas can flow is particularly metal wool such as glass wool, rock wool, steel wool, and inorganic materials with high shape retention performance (metal, A porous body made of a sintered body of metal oxides and metal hydroxides), depending on the material, etc. It can be preferably used by also using a cover member composed of a rectifier or the like with a structure.
In this manner, the wind speed suppressing means is made of the fibrous or porous material 7 which eliminates turbulence of the airflow and which is arranged at the outlet of the orifice 2 and through which the gas can flow, thereby simplifying the structure of the wind speed suppressing means. , the injection head can be compactly configured and can be applied to existing equipment as it is.

Other actions of the injection heads 1I and 1J having diffusers for the gas-based fire extinguishing equipment of this embodiment are the same as those of the low-velocity gas-based fire-extinguishing system using the injection head 1C2 of the second modification of the third embodiment. is.

By the way, the fibrous or porous material 7 that eliminates the turbulence of the airflow through which the gas can flow is arranged at the outlet of the orifice 2. In addition to being composed of a homogeneous material as a whole, the ejection heads 1K and 1L shown in FIG. As shown in , a fibrous or porous material whose pore size is changed in the direction of gas flow, for example, a material whose pore size is reduced in the direction of gas flow can be used.

Specifically, an ejection head 1K shown in FIG. 7A is provided with a plurality of orifices 2, and a metallic porous material 7a made of a three-dimensional network structure with large pore diameters at the center at the exit of the orifices 2. 7 ( The ejection head 1L shown in b) is provided with a plurality of orifices 2, and at the outlet thereof, a metallic porous material 7a consisting of a three-dimensional mesh structure with large pore diameters in the center and more pores in the outer periphery. A cylindrical porous material 7 that eliminates turbulence of airflow is arranged by arranging metallic porous materials 7b having small pore diameters in layers.

It should be noted that the type of the ejection head and orifice, and the fibrous or porous material 7 through which the gas can flow to eliminate turbulence in the airflow are not limited to those of this embodiment.

[Comparative test 1]
Next, a comparison test was conducted using the ejection head 1L shown in FIG . 7B and the conventional ejection head 10B shown in FIG. 8B.
The test was conducted in the test room shown in FIG. 10 using each ejection head and wind speed sensor.
Table 1 shows the test results. Here, each wind speed indicates the maximum measured value.

As is clear from the results of Comparative Test 1 shown in Table 1, in the low wind speed gas fire extinguishing system using the jet head equipped with the wind speed suppressing means, when the extinguishing agent gas is discharged while ensuring the flow rate of the gas, It was confirmed that the magnitude of the wind speed generated in the air can be reduced to about 1/3 to 1/6.

[Comparative test 2]
Next, similarly, using the ejection head 1L shown in FIG . 7B and the conventional ejection head 10B shown in FIG. Wind speed (m/s) was measured at points separated by distance).
The test was carried out using a wind speed sensor to determine the magnitude of the wind speed generated when 40 m ³ /min of extinguishing agent gas was discharged from the injection head.
The test results are shown in Table 2 (example: ejection head 1L) and Table 3 (comparative example: ejection head 10B). Here, each wind speed indicates the maximum measured value.

As is clear from the results of Comparative Test 2 shown in Tables 2 and 3, in the low wind speed gas fire extinguishing system using the jet head equipped with the wind speed suppression means, the extinguishing agent gas is released while ensuring the gas flow rate. It has been confirmed that the magnitude of the wind speed generated when the wind is blown can be reduced to an extremely low value (2 m/s or less).

By the way, the amount of extinguishing agent required for extinguishing the fire is calculated according to the volume of the protective compartment and must be emitted within a specified time. Therefore, according to the radial flow rate, a plurality of injection heads are appropriately installed in the protection compartment.
As a result, regardless of the amount of fire extinguishing agent required for extinguishing the fire, the wind velocity generated in the exhibition room can be suitably suppressed.
In addition, when the display item is sensitive to wind speed, such as a hanging scroll, a plurality of installations were required in the conventional jet head in order to reduce the radiation flow rate per jet head. In the gas-based fire extinguishing system, the performance of the injection head has been significantly improved, so there is no need to reduce the discharge flow rate of the extinguishing agent gas per head. Suppresses the increase in the number of ejection heads required when the discharge flow rate is reduced. so as to reduce the construction cost of the low wind speed gas fire extinguishing system.

As described above, the low wind speed gas fire extinguishing system of the present invention has been described based on a plurality of examples, but the present invention is not limited to the configurations described in the above examples, and for example, the configurations described in each example. The configuration can be appropriately changed within the scope of the purpose, such as combining the configurations appropriately or using various structures that can reduce the wind speed generated when the extinguishing agent gas is discharged to the wind speed suppressor. It is.

Since the low wind speed gas fire extinguishing system of the present invention can reduce the wind speed generated when extinguishing agent gas is discharged, it is possible to use the gas fire extinguishing equipment using extinguishing agent gas such as carbon dioxide, nitrogen, fluorine compound, etc. In particular, it can be suitably used for gas-based fire extinguishing equipment applied to exhibition rooms and storehouses such as art museums and museums where cultural assets are exhibited and stored, and is also applicable to newly installed gas-based fire extinguishing equipment. However, it can also be applied to existing gas-based fire extinguishing equipment simply by replacing the jet head or attaching a wind speed suppressor.

1A Jet head used for low wind velocity gas fire extinguishing system 1B Jet head used for low wind velocity gas fire extinguishing system 1C Jet head used for low wind velocity gas fire extinguishing system 1C1 Jet head used for low wind velocity gas fire extinguishing system 1C2 Low wind velocity gas fire extinguishing system Ejection head used for the system 1I Ejection head used for low wind velocity gas fire extinguishing system 1J Ejection head used for low wind velocity gas fire extinguishing system 1K Ejection head used for low wind velocity gas fire extinguishing system 1L Ejection head used for low wind velocity gas fire extinguishing system 2 Orifice 3A wind speed suppressor 3B wind speed suppressor 3C wind speed suppressor 3C1 wind speed suppressor 3C2 wind speed suppressor 4 piping 5 deflector (deflection member)
6 horn (diffusion member)
7 Fibrous or porous material that eliminates turbulence in gas flow 7a Metal porous material with large pore size 7b Metal porous material with small pore size

Claims (1)

Arranged at the outlet of the orifice in the injection head installed to discharge the extinguishing agent gas into the protected compartment in the gas-based fire extinguishing equipment that uses extinguishing agent gas applied to the exhibition room or storage room of the museum or museum A low-velocity gas-based fire extinguishing system comprising a wind speed suppressing means for extinguishing agent gas made of fibrous or porous material through which cylindrical gas can flow, wherein the wind speed suppressing means for extinguishing agent gas is a cylindrical gas By providing a disk-shaped deflector on the end face of the fibrous or porous material that allows the flow of the extinguishing agent gas, the extinguishing agent gas is discharged only from the outer peripheral surface, and when the extinguishing agent gas is discharged from the injection head A low-velocity gas-based fire extinguishing system characterized by having a wind velocity of 1 to 2 m/s in a space having an axial distance of 350 mm to 2350 mm and a horizontal distance of 0 mm to 3000 mm from the jet head.

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