WO2024257508A1 - Injection head equipped with silencing means for gas-based fire extinguishing equipment - Google Patents

Abstract

Provided is an injection head equipped with a silencing means for gas-based fire extinguishing equipment, the injection head having improved performance for dispersing fire extinguishing agent gas without a decrease in silencing performance, the injection head thus being suitably usable with, e.g., low flow-rate fire extinguishing equipment with an extended fire extinguishing agent gas emission time, and a fire extinguishing target section having a large floor area relative to volume.　An injection head 1A equipped with a silencing means is installed in gas-based fire extinguishing equipment that uses a fire extinguishing agent gas, to discharge the fire extinguishing agent gas to a fire extinguishing target section. The silencing means is composed of a silencing member 4 made of a porous material disposed at an outlet portion of an orifice 31, through which porous material gas can flow. The silencing member 4 is provided with an exposed portion 4A of which a circumferential end face is open to the atmosphere, and a high-speed discharge portion 4B from which the fire extinguishing agent gas is discharged in a specific direction at a higher speed than the speed at which the fire extinguishing agent gas is discharged from the exposed portion 4A. The exposed portion 4A and the high-speed discharge portion 4B are partitioned.

Description

Jet head with sound dampening means for gas-based fire extinguishing equipment

The present invention relates to a spray head that is installed in a gas-based fire extinguishing system that uses extinguishing gas such as nitrogen, carbon dioxide, or a fluorine compound to discharge the extinguishing gas into a target compartment for extinguishing a fire, and in particular to a spray head equipped with soundproofing means for gas-based fire extinguishing systems that can reduce the noise generated when the extinguishing gas is discharged.

In gas-based fire extinguishing systems that use extinguishing gases such as nitrogen, carbon dioxide, and fluorine compounds, when the gas-based fire extinguishing system is activated to extinguish a fire, the extinguishing gas is released so that the extinguishing gas concentration in the target compartment reaches the extinguishing concentration within a specified time.

At this time, the extinguishing gas is discharged from a spray head installed on the ceiling or wall surface to discharge the extinguishing gas into the compartment to be extinguished. The spray head for the gas-based fire extinguishing equipment is as shown in FIG. 13(a) in which an orifice 20 is provided at the outlet of a spray head 10A connected to a pipe through which the extinguishing gas is supplied, and the extinguishing gas is discharged directly from the orifice 20 into the compartment to be extinguished, or as shown in FIG. 13(b) in which an orifice 20 is provided at the outlet of a spray head 10B connected to a pipe through which the extinguishing gas is supplied, Conventionally, there have been widely used devices such as those equipped with an orifice 20 and a cone-shaped deflector (deflection member) 50, which deflects the extinguishing agent gas discharged from the orifice 20 and discharges it into the area to be extinguished, and those equipped with an orifice (not shown) and a cone-shaped horn (diffusion member) 60 at the outlet of the injection head 10C as shown in FIG. 13(c), which diffuses the extinguishing agent gas discharged from the orifice by the horn (diffusion member) 60 and discharges it into the area to be extinguished.

In this way, the above-mentioned conventional gas-based fire extinguishing equipment injection heads 10A, 10B, and 10C are designed to restrict the flow rate of the extinguishing gas emitted from the injection heads by the orifices 20 so that the same amount of extinguishing gas is emitted from each of the injection heads, of which multiple units are usually installed in the area to be extinguished. However, this is known to cause high levels of noise (specifically, noise of 120 dB or more) when the extinguishing gas is released from the injection heads.

When gas-based fire extinguishing equipment is activated, it is assumed that no one is present in the area to be extinguished. Therefore, in the past, the noise (vibration) generated when the extinguishing gas is released from the injection head was not considered a problem at all, and no measures had been taken to address it.

However, based on the knowledge of how to deal with cases where people are unable to escape in the area being extinguished when gas-based fire extinguishing equipment is activated, that the noise generated when extinguishing gas is released from the spray head may have an adverse effect on people in the vicinity, and that noise (vibration) can cause failures in precision equipment such as information and communication devices, the applicant of the present application has previously proposed technology to reduce the noise generated when extinguishing gas is released (see, for example, Patent Documents 1 and 2).

JP 2011-125673 A JP 2013-169333 A

The injection head equipped with a silencing means for gas-based fire extinguishing equipment proposed by the applicant above is equipped with a block-shaped silencing member made of a porous material through which gas can flow, which is disposed at the outlet of the orifice, and this enables a high noise reduction rate even with a small injection head.

However, in a spray head equipped with a sound-absorbing means, the flow velocity of the extinguishing gas when sprayed is reduced due to the porous material used as the sound-absorbing means, and therefore the diffusion performance of the extinguishing gas tends to be lower than that of a spray head without a sound-absorbing function.
There is a trade-off between increasing the sound deadening performance and decreasing the diffusion performance of the extinguishing gas, and maintaining the diffusion performance results in low sound deadening performance.
Furthermore, in recent years, fire extinguishing equipment that extends the discharge time of extinguishing gas has appeared, and in this case, the flow rate of extinguishing gas can be reduced compared to normal, which has the advantage of reducing the area of the pressure relief port and the diameter of the pipe, but the reduction in diffusion performance due to the reduction in the flow rate of extinguishing gas becomes a problem. This problem is particularly serious when the target compartment for extinguishing is a compartment with a large floor area relative to its volume, such as an underfloor compartment. Here, the underfloor compartment can be, for example, an underfloor compartment in a server room as shown in Fig. 14, and refers to a compartment for extinguishing a fire that is smaller in height H than a general target compartment, for example, about 300 mm.

In consideration of the problems with the injection head equipped with a silencing means for the gas-based fire extinguishing equipment described above, the present invention aims to provide an injection head equipped with a silencing means for a gas-based fire extinguishing equipment that can be used for low-flow fire extinguishing equipment with an extended discharge time of the fire extinguishing gas and for fire extinguishing compartments with a large floor area relative to their volume by improving the diffusion performance of the fire extinguishing gas without reducing the silencing performance.

In order to achieve the above object, the injection head with silencing means for gas-based fire extinguishing equipment of the present invention is an injection head with silencing means that is installed in a gas-based fire extinguishing equipment that uses extinguishing gas to discharge the extinguishing gas into a compartment to be extinguished, characterized in that the silencing means is composed of a silencing member made of a porous material through which gas can flow and disposed at the outlet of an orifice, the silencing member has an exposed portion whose circumferential end face is open to the atmosphere, and a high-speed discharge portion that discharges the extinguishing gas in a specific direction at a speed faster than the discharge speed of the extinguishing gas from the exposed portion, and the exposed portion and the high-speed discharge portion are partitioned.

In this case, the direction of extinguishing gas discharged from the exposed portion and the direction of extinguishing gas discharged from the high-speed discharge portion can be approximately parallel, can form a specified acute angle, or can form an angle of approximately 90°.

In addition, the sound-absorbing material constituting the exposed portion can be formed in a cylindrical, columnar or polygonal shape, or in a shape that bulges outward from other portions.

In addition, the pore size of the porous material that constitutes the sound deadening member can be made smaller in the direction in which the gas flows.

The high-speed ejection portion may be in contact with a through hole formed in the peripheral surface of the ejection head body.
The high-speed ejection portions may be formed at equal angular intervals on the circumferential surface of the ejection head body.

The exposed portion may also be disposed between the high-speed release portions.

In addition, the exposed portion can be located upstream and the high-speed release portion downstream in the direction in which the extinguishing agent gas flows into the injection head.

In addition, the distance from the center of the injection head to the extinguishing gas discharge surface of the exposed portion can be made greater than the distance to the extinguishing gas discharge surface of the high-velocity discharge portion.

A diffusion section may also be provided between the orifice and the exposed section and high-velocity release section to uniformly diffuse the extinguishing gas that has passed through the orifice.

The injection head with silencing means for gas-based fire extinguishing equipment of the present invention improves the diffusion performance of the extinguishing gas without reducing the silencing performance, making it possible to provide an injection head with silencing means for gas-based fire extinguishing equipment that can be used for low-flow fire extinguishing equipment with extended extinguishing gas discharge time and for fire extinguishing compartments with a large floor area relative to their volume.

1 is a perspective view showing an external appearance of a first embodiment of an injection head equipped with a silencing means for a gas-based fire extinguishing system according to the present invention; FIG. 2 is a cross-sectional view of the ejection head. FIG. 4 is a cross-sectional view showing a second embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. FIG. 11 is an external perspective view showing a third embodiment of an injection head equipped with a silencing means for a gas-based fire extinguishing system according to the present invention. FIG. 2 is a cross-sectional view of the ejection head. FIG. 13 is an external perspective view showing a fourth embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system of the present invention. FIG. 13 is an external perspective view showing a fifth embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system of the present invention. FIG. 8 is a cross-sectional view of the ejection head according to the embodiment of the present invention shown in FIG. FIG. 8 is a cross-sectional view of the ejection head according to the embodiment of the present invention shown in FIG. FIG. 13 is an external perspective view showing a sixth embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system of the present invention. FIG. 2 is a cross-sectional view of the ejection head. FIG. 13 is a cross-sectional view showing a seventh embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention. FIG. 1 is an explanatory diagram showing a conventional injection head for a gas-based fire extinguishing system. FIG. 1 is a schematic diagram showing a server room.

Below, an embodiment of the injection head equipped with a silencing means for a gas-based fire extinguishing system of the present invention will be explained with reference to the drawings.

1 and 2 show a first embodiment of a jet head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention.
This injection head 1A with silencing means for gas-based fire extinguishing equipment is an injection head with silencing means that is installed in a gas-based fire extinguishing equipment that uses extinguishing gas in order to release the extinguishing gas into a compartment to be extinguished, and the silencing means is composed of a silencing member 4 made of a porous material through which gas can flow, which is arranged at the outlet portion of the orifice 31, and the silencing member 4 has an exposed portion 4A whose circumferential end face is open to the atmosphere, and a high-speed release portion 4B that releases the extinguishing gas in a specific direction at a speed faster than the release speed of the extinguishing gas from the exposed portion 4A, so that the exposed portion 4A and the high-speed release portion 4B are partitioned.

The injection head 1A is attached to the ceiling surface (underside of floor F) of the underfloor section of the server room, as shown in FIG. 14, for example, and is composed of an injection head body 2 connected to a pipe (not shown) through which the extinguishing agent gas is supplied, an orifice plate 3 having an orifice 31 formed therein and detachably arranged on the injection head body 2, and a block-shaped sound-absorbing member 4 made of a porous material through which gas can flow and arranged at the outlet of the orifice 31.

The injection head body 2 has a circular cross-sectional shape and is made up of an upper structure 2A that forms a connection with the piping, and a lower structure 2B that is attached by screwing to the upper structure 2A.

The orifice plate 3 with the orifices 31 formed therein is arranged on the injection head body 2 so that it can be detached from the opening on the connection side of the piping, so that orifice plates 3 with multiple types of orifices 31 formed therein can be selected according to conditions such as the installation location.

Moreover, it is preferable that the large diameter portion of the orifice 31 faces the sound deadening member 4 .
This allows the extinguishing gas to flow evenly from the center to the peripheral parts of the sound-absorbing material 4, which in turn makes it possible to uniformly distribute the noise generated at the point where the extinguishing gas is released, thereby further increasing the noise reduction rate.

The block-shaped sound deadening member 4 made of a porous material can be constructed as an integral structure, or as shown in this embodiment, as a divided structure made up of a first member 41, a second member 42, and a third member 43 that covers the outer periphery of the top of the second member 42.

A diffusion section 5 is provided between the first member 41 and the second member 42 for uniformly diffusing the extinguishing agent gas that has passed through the orifice 31 and flowed into the first member 41 toward the second member 42.
This diffusion section 5 has a cylindrical shape with a large number of through holes (orifices) formed on its peripheral surface, and in this embodiment, it is constructed integrally with the upper structure 2A of the ejection head main body 2, but it can also be constructed as a separate member from the ejection head main body 2.

The porous material constituting the sound-absorbing member 4 can be preferably a porous structure having a three-dimensional mesh structure made of an inorganic material (metal, metal oxide, metal hydroxide, etc.) with high shape retention properties.

The pore size of the voids in the porous material constituting the soundproofing member 4 can be changed in the direction of gas flow, or more specifically, can be made smaller in the direction of gas flow, and for example, in this embodiment, the pores in the third member 43 can be made of a material having a smaller pore size than the pores in the first member 41 and the second member 42.
In this way, by reducing the pore size of the porous material constituting the sound deadening member 4 in the direction in which the gas flows, the noise reduction rate can be further increased.

Whether the sound-absorbing member 4 is of an integral structure or a divided structure, one end face of the sound-absorbing member 4 is disposed in contact with the ejection head main body 2 (which in this embodiment may include the orifice plate 3), and the outer peripheral surface of the sound-absorbing member 4, specifically, the outer peripheral surface of the third member 43 and a portion of the outer peripheral surface of the lower part of the second member 42, are open to the atmosphere.
The outer peripheral surface of the third member 43 constitutes an exposed portion 4A whose circumferential end face is open to the atmosphere.
In addition, a portion of the outer peripheral surface of the lower part of the second member 42 comes into contact with through holes 21 formed at multiple locations (four locations at 90° intervals in this embodiment) on the peripheral surface of the lower structure 2B of the injection head main body 2, thereby forming a high-speed release portion 4B that releases extinguishing agent gas in a specific direction at a speed faster than the release speed of the extinguishing agent gas from the exposed portion 4A.
In other words, the extinguishing gas passes through the orifice 31 from the exposed portion 4A formed by the outer peripheral surface of the third member 43 and flows into the first member 41, passes through the diffusion portion 5, and flows into the second member 42 and the third member 43 covering the upper outer peripheral portion of the second member 42, and is released at a sufficiently decelerated state, thereby ensuring the sound-absorbing performance of the injection head 1A.
On the other hand, the extinguishing gas that passes through the orifice 31 and flows into the first member 41 from the high-speed release section 4B formed by the outer peripheral surface in contact with the through hole 21 of the injection head body 2 at the lower part of the second member 42 further passes through the diffusion section 5 and flows into the lower part of the second member 42, and is released while maintaining the required flow rate, thereby improving the diffusion performance of the extinguishing gas.
Here, the through hole 21 can be formed, for example, as a circular hole with a diameter of about 10 mm or more, or can be configured as an oval or slit-shaped hole with a similar cross-sectional area (a cross-sectional area of about 80 ^mm2 or more).
The balance between the diffusibility of the extinguishing agent gas and the sound pressure reduction effect can be adjusted by changing the exposed area ratio between the exposed portion 4A formed by the outer peripheral surface of the third member 43 and the high-speed release portion 4B formed by the outer peripheral surface in contact with the through hole 21 of the jet head body 2 at the bottom of the second member 42. For example, when the flow rate is large with a large-diameter jet head, the sound pressure can be efficiently reduced by making the exposed portion 4A larger (lengthening the axial dimension).
In this embodiment, the outer peripheral surface of the lower part of the second member 42 is in contact with the through hole 21 to form the high-speed release section 4B, but in order to improve the sound-absorbing performance, for example, a sound-absorbing member (not shown) that is thinner than the third member 43 and covers the outer peripheral part of the lower part of the second member 42 can be provided between the second member 42 and the lower structure 2B of the ejection head main body 2, within the range in which the required flow rate is maintained.
In addition, in this embodiment, the through holes 21 that constitute the high-speed release section 4B are formed in four locations at 90° intervals (equidistant intervals) so that the extinguishing agent gas is diffused into the fire-extinguishing target compartment, which has a rectangular planar shape. However, depending on the shape of the fire-extinguishing target compartment and the installation form of the injection head, the through holes 21 that constitute the high-speed release section 4B can be formed in eight locations at 45° intervals, six locations at 60° intervals, three locations at 120° intervals, or two locations at 180° intervals.
Also, the through holes 21 constituting the high speed release portion 4B may be formed unevenly so that the extinguishing agent gas is diffused only in a specific direction.

By improving the diffusion performance of the extinguishing gas without compromising sound deadening performance, it is possible to accommodate low-flow fire extinguishing equipment with extended extinguishing gas discharge times and fire extinguishing compartments with a large floor area relative to their volume.

FIG. 3 shows a second embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention.
The injection head 1B equipped with the silencing means for the gas-based fire extinguishing system omits the orifice plate 3 and the first member 41 of the silencing member 4 of the injection head 1A of the first embodiment shown in Figs. 1 and 2, and the through holes 21 formed in the lower structure 2B of the injection head main body 2 are formed so that the discharge direction of the extinguishing agent gas from the through holes 21 is slightly (approximately 5 to 30°, in this embodiment, approximately 10°) downward from the horizontal direction of the injection head 1A of the first embodiment.
In this case, a large number of through holes formed on the peripheral surface of the diffusion portion 5 serve as orifices.
Here, the angle of the discharge direction of the extinguishing gas from the through hole 21 formed in the lower structure 2B of the injection head main body 2 is not limited to the above angle, and depending on conditions such as the installation location of the injection head, the discharge direction of the extinguishing gas discharged from the exposed portion 4A and the discharge direction of the extinguishing gas discharged from the high-speed discharging portion 4B can form a predetermined angle of any angle (acute angle) between 0 and 90°.
In addition, the direction in which the extinguishing agent gas is discharged from the through holes 21 formed in the lower structure 2B of the injection head main body 2 can be horizontal or downward, or can be upward from the horizontal, for example, at an angle of about 5 to 30° upward, depending on the shape of the compartment to be extinguished and the installation position of the injection head, etc.

The rest of the configuration and function of the ejection head 1B of this embodiment is the same as that of the ejection head 1A of the first embodiment.

4 and 5 show a third embodiment of the injection head equipped with sound silencing means for a gas-based fire extinguishing system according to the present invention.
The injection head 1C equipped with the silencing means for the gas-based fire extinguishing system is configured with a silencing member 40 formed by integrating the first member 41 and the second member 42 of the silencing member 4 of the injection head 1A of the first embodiment shown in Figs. 1 and 2, omits the diffusion section 5, and forms the through holes 21 in the lower structure 2B of the injection head main body 2 so that the discharge direction of the extinguishing agent gas from the through holes 21 is slightly (approximately 5 to 30°, in this embodiment, approximately 10°) downward from the horizontal direction of the injection head 1A of the first embodiment.

The injection head body 2 has a circular cross-sectional shape and is made up of an upper structure 2A that forms a connection with the piping, and a lower structure 2B that is attached to the upper structure 2A with a screw member.

The rest of the configuration and function of the ejection head 1C of this embodiment is the same as that of the ejection head 1A of the first embodiment.

FIG. 6 shows a fourth embodiment of the injection head having a sound silencing means for a gas-based fire extinguishing system according to the present invention.
The injection head 1D equipped with the silencing means for the gas-based fire extinguishing system has through holes 22 having a smaller diameter than the through holes 21 (having a diameter about 1/3 to 1/5 of the diameter of the through holes 21) formed alternately with the through holes 21 at a plurality of locations (four locations at 90° intervals in this embodiment) on the peripheral surface of the lower structure 2B of the injection head body 2 of the injection head 1C of the third embodiment shown in Figs. 3 to 5.
Furthermore, a portion of the outer peripheral surface of the lower part of the sound-absorbing member 40 of the sound-absorbing member 4 constitutes a second exposed portion and comes into contact with the through-hole 22 having a smaller diameter than the through-hole 21, so that the extinguishing agent gas is released from the through-hole 22 at a sufficiently reduced speed, thereby ensuring the sound-absorbing performance of the injection head 1D.

The rest of the configuration and function of the ejection head 1D of this embodiment is the same as that of the ejection head 1C of the third embodiment.

7 to 9 show a fifth embodiment of the injection head having sound silencing means for a gas-based fire extinguishing system according to the present invention.
The injection head 1E equipped with a silencing means for a gas-based fire extinguishing system is configured by integrating the first member 41 and the second member 42 of the silencing member 4 of the injection head 1A of the first embodiment shown in Figures 1 and 2, and then dividing it into silencing members 40a, 40b in the vertical direction, with the third member 43 sandwiched between them, thereby omitting the diffusion section 5.

The injection head body 2 has a regular polygonal (regular octagonal) cross-sectional shape and is composed of an upper structure 2A that forms a connection with the piping, and a lower structure 2B that is attached to the upper structure 2A by screw members, with the third member 43 sandwiched between them.

The orifice plate 3 with the orifices 31 formed therein is removably arranged on the ejection head body 2, so that the orifice plate 3 with multiple types of orifices 31 formed therein can be selected according to conditions such as the installation location.

The pore size of the voids in the porous material constituting the sound deadening member 4 is such that the entire member is made of a homogeneous material, and in this embodiment, the pore size of the voids in the third member 43 is smaller than the pore size of the voids in the sound deadening members 40a and 40b.
In this manner, by forming the third member 43 from a material with a small pore diameter, the noise reduction rate can be further increased.

Whether the sound-absorbing member 4 has an integral structure or a divided structure, one end face of the sound-absorbing member 4 is disposed in contact with the ejection head main body 2 (which may include the orifice plate 3 in this embodiment), and the outer peripheral surface of the sound-absorbing member 4, specifically, the outer peripheral surface of the third member 43 and a part of the outer peripheral surface of the sound-absorbing member 40b, are open to the atmosphere.
The outer peripheral surface of the third member 43 constitutes an exposed portion 4A whose circumferential end face is open to the atmosphere.
In addition, a portion of the outer peripheral surface of the sound-absorbing member 40b comes into contact with through holes 21 formed at multiple locations (four locations at 90° intervals in this embodiment) on the outer peripheral surface of the lower structure 2B of the injection head main body 2, thereby forming a high-speed release portion 4B that releases extinguishing agent gas in a specific direction at a speed faster than the release speed of the extinguishing agent gas from the exposed portion 4A.
In other words, from the exposed portion 4A formed by the outer peripheral surface of the third member 43, the extinguishing agent gas passes through the orifice 31 and flows into the sound-absorbing member 40a, and then flows further into the third member 43 and is released at a sufficiently decelerated state, thereby ensuring the sound-absorbing performance of the injection head 1A.
On the other hand, from the high-speed release section 4B formed by the outer peripheral surface of the sound-absorbing member 40b in contact with the through hole 21 of the injection head body 2, the extinguishing gas passes through the orifice 31 and flows into the sound-absorbing member 40a, passes through the third member 43, flows into the sound-absorbing member 40b, and is released while maintaining the required flow rate, thereby improving the diffusion performance of the extinguishing gas.
Here, the through holes 21 can be formed so that there are four of them at one location, and the total cross-sectional area of the four through holes 21 is about 80 ^mm2 or more.

The rest of the configuration and function of the ejection head 1E of this embodiment is the same as that of the ejection head 1A of the first embodiment.

10 and 11 show a sixth embodiment of the injection head having a sound silencing means for a gas-based fire extinguishing system according to the present invention.
This injection head 1F with silencing means for gas-based fire extinguishing equipment is an injection head with silencing means that is installed in a gas-based fire extinguishing equipment that uses extinguishing gas in order to release the extinguishing gas into a compartment to be extinguished, and the silencing means is composed of a silencing member 4 made of a porous material through which gas can flow, which is arranged at the outlet portion of the orifice 31, and the silencing member 4 has an exposed portion 4A whose circumferential end face is open to the atmosphere, and a high-speed release portion 4B that releases the extinguishing gas in a specific direction at a speed faster than the release speed of the extinguishing gas from the exposed portion 4A, so that the exposed portion 4A and the high-speed release portion 4B are partitioned.

The block-shaped sound-absorbing member 4 made of a porous material may be constructed as an integral structure, or as shown in this embodiment, as a divided structure consisting of a first member 41, a second member 42, and a third member 43 covering the upper outer periphery of the second member 42.
Here, the first member 41 can be formed into a cylindrical shape, or a shape whose cross-sectional area expands in the direction in which the gas flows (a truncated cone shape) as shown in this embodiment.

A diffusion section 5 is provided between the first member 41 and the second member 42 for uniformly diffusing the extinguishing agent gas that has passed through the orifice 31 and flowed into the first member 41 toward the second member 42.
The diffusion portion 5 has a disk shape with a plurality of through holes (orifices) formed therein, and in this embodiment, is disposed in the upper structure 2A of the ejection head main body 2 by being screwed thereto.

Whether the sound-absorbing member 4 is of an integral structure or a divided structure, one end face of the sound-absorbing member 4 is disposed in contact with the ejection head main body 2 (which in this embodiment may include the orifice plate 3), and the outer peripheral surface of the sound-absorbing member 4, specifically, the outer peripheral surface of the third member 43 and a portion of the outer peripheral surface of the lower part of the second member 42, are open to the atmosphere.
The outer peripheral surface of the third member 43 constitutes an exposed portion 4A whose circumferential end face is open to the atmosphere.
In addition, a portion of the outer peripheral surface of the lower part of the second member 42 comes into contact with through holes 21 formed at multiple locations (four locations at 90° intervals in this embodiment) on the peripheral surface of the lower structure 2B of the injection head main body 2, thereby forming a high-speed release portion 4B that releases extinguishing agent gas in a specific direction at a speed faster than the release speed of the extinguishing agent gas from the exposed portion 4A.
In other words, the extinguishing gas passes through the orifice 31 from the exposed portion 4A formed by the outer peripheral surface of the third member 43 and flows into the first member 41, passes through the diffusion portion 5, and flows into the second member 42 and the third member 43 covering the upper outer peripheral portion of the second member 42, and is released at a sufficiently decelerated state, thereby ensuring the sound-absorbing performance of the injection head 1A.
On the other hand, the extinguishing gas that passes through the orifice 31 and flows into the first member 41 from the high-speed release section 4B formed by the outer peripheral surface in contact with the through hole 21 of the injection head body 2 at the lower part of the second member 42 further passes through the diffusion section 5 and flows into the lower part of the second member 42, and is released while maintaining the required flow rate, thereby improving the diffusion performance of the extinguishing gas.
Furthermore, by making the distance from the center of the injection head 1F to the extinguishing gas discharge surface of the exposed portion 4A greater than the distance to the extinguishing gas discharge surface of the high-speed discharge portion 4B, the soundproofing performance can be further improved.

All of the above-mentioned injection heads 1A to 1F are intended to be attached to the ceiling surface (underside of floor F) of the underfloor compartment of a server room, for example, as shown in FIG. 14, and the direction of the extinguishing gas discharged from the exposed portion 4A and the direction of the extinguishing gas discharged from the high-velocity discharge portion 4B are made to be approximately parallel or form a predetermined acute angle. For example, FIG. 12 shows a seventh embodiment of an injection head equipped with a silencing means for a gas-based fire extinguishing system of the present invention, when attached to the wall W of the underfloor compartment of a server room, as shown in FIG. 14.

The injection head 1G equipped with the silencing means for this gas-based fire extinguishing system is composed of a silencing member 40 formed by integrating the first member 41 and the second member 42 of the silencing member 4 of the injection head 1A of the first embodiment shown in Figures 1 and 2, omits the diffusion section 5, and is configured so that the discharge direction of the extinguishing gas from the through hole 21 formed in the lower structure 2B of the injection head main body 2 forms an angle of approximately 90° with the horizontal direction of the injection head 1A of the first embodiment (whereas the discharge direction of the extinguishing gas discharged from the exposed portion 4A and the discharge direction of the extinguishing gas discharged from the high-speed discharge portion 4B are approximately parallel).

Whether the sound-absorbing member 4 has an integral structure or a divided structure, one end face of the sound-absorbing member 4 is disposed in contact with the ejection head main body 2 (which may include the orifice plate 3 in this embodiment), and the outer peripheral surface of the sound-absorbing member 4, specifically, the outer peripheral surface of the third member 43 and a portion of the other end face of the sound-absorbing member 40, are open to the atmosphere.
The outer peripheral surface of the third member 43 constitutes an exposed portion 4A whose circumferential end face is open to the atmosphere.
In addition, a portion of the other end face of the sound-absorbing member 40 comes into contact with through holes 21 formed at multiple locations (four locations at 90° intervals in this embodiment) on the underside of the lower structure 2B of the injection head main body 2 (which becomes a vertical surface when attached to the wall W of the underfloor compartment of the server room), thereby forming a high-speed release portion 4B that releases extinguishing agent gas in a specific direction at a speed faster than the release speed of the extinguishing agent gas from the exposed portion 4A.
In other words, the extinguishing gas that passes through the orifice 31 and flows into the sound-absorbing member 40 from the exposed portion 4A formed by the outer peripheral surface of the third member 43 further flows into the third member 43 that covers the upper outer peripheral portion of the sound-absorbing member 40 and is released at a sufficiently decelerated state, thereby ensuring the sound-absorbing performance of the injection head 1A.
On the other hand, the extinguishing agent gas that has passed through the orifice 31 and flowed into the sound-absorbing member 40 is released from the high-speed release section 4B formed by the other end face of the sound-absorbing member 40 that is in contact with the through hole 21 of the injection head body 2 while maintaining the required flow rate, thereby improving the diffusion performance of the extinguishing agent gas.

　The above describes the injection head equipped with silencing means for gas-based fire extinguishing equipment of the present invention based on its embodiment, but the present invention is not limited to the configuration described in the above embodiment, and the configuration can be changed as appropriate within the scope of the spirit of the invention, such as by appropriately combining the configurations described in each embodiment.

The injection head equipped with the soundproofing means for gas-based fire extinguishing equipment of the present invention improves the diffusion performance of the extinguishing gas without reducing soundproofing performance, and can be used for low-flow fire extinguishing equipment with extended extinguishing gas discharge time and fire extinguishing compartments with a large floor area relative to their volume. Therefore, it can be suitably used for gas-based fire extinguishing equipment that uses extinguishing gases such as nitrogen, carbon dioxide, and fluorine compounds and is installed in compartments with a large floor area relative to their volume, such as underfloor compartments. In addition, since the protection range can be expanded without increasing the number of injection heads installed, it can be widely used for gas-based fire extinguishing equipment installed in general fire extinguishing compartments. Its application is not limited to newly installed gas-based fire extinguishing equipment, and it can be applied to existing gas-based fire extinguishing equipment by simply replacing the injection head.

Reference Signs List 1A to 1G Injection head 2 Injection head body 2A Upper structure 2B Lower structure 3 Orifice plate 31 Orifice 4 Sound absorbing member 4A Exposed portion 4B High-speed emission portion 5 Diffusion portion

Claims (12)

A gas-based fire extinguishing system using a fire extinguishing gas, comprising: a jet head equipped with a sound-absorbing means for discharging the fire extinguishing gas into a target compartment for extinguishing,
The silencing means is configured with a silencing member made of a porous material through which gas can flow and disposed at the outlet of the orifice,
The sound deadening member includes an exposed portion having a circumferential end surface open to the atmosphere, and a high-speed release portion that releases the extinguishing agent gas in a specific direction at a speed faster than the release speed of the extinguishing agent gas from the exposed portion,
A jet head equipped with sound silencing means for a gas-based fire extinguishing system, characterized in that the exposed portion and the high-velocity discharging portion are partitioned. The injection head with soundproofing means for gas-based fire extinguishing equipment described in claim 1, characterized in that the direction of the extinguishing gas discharged from the exposed portion and the direction of the extinguishing gas discharged from the high-velocity discharge portion are approximately parallel. The injection head with soundproofing means for gas-based fire extinguishing equipment described in claim 1, characterized in that the direction of the extinguishing gas discharged from the exposed portion and the direction of the extinguishing gas discharged from the high-velocity discharge portion form a predetermined acute angle. The injection head with soundproofing means for a gas-based fire extinguishing system described in claim 1, characterized in that the direction of the extinguishing gas discharged from the exposed portion and the direction of the extinguishing gas discharged from the high-velocity discharge portion form an angle of approximately 90°. The injection head with silencing means for gas-based fire extinguishing equipment described in claim 1, characterized in that the silencing member constituting the exposed portion is formed in a cylindrical, columnar or polygonal shape, or in a shape that bulges outward from other portions. An injection head with soundproofing means for a gas-based fire extinguishing system, as described in claim 1, characterized in that the pore size of the voids in the porous material that constitutes the soundproofing member is made smaller in the direction in which the gas flows. The injection head with silencing means for gas-based fire extinguishing equipment described in claim 1, characterized in that the high-speed discharge portion is in contact with a through hole formed on the peripheral surface of the injection head body. The injection head with silencing means for gas-based fire extinguishing equipment described in claim 1, characterized in that the exposed portion is disposed between the high-velocity discharge portions. The injection head with soundproofing means for gas-based fire extinguishing equipment described in claim 1, characterized in that an exposed portion is arranged on the upstream side and a high-speed release portion is arranged on the downstream side with respect to the direction in which the extinguishing gas flows into the injection head. The injection head with silencing means for gas-based fire extinguishing equipment described in claim 1, characterized in that the distance from the center of the injection head to the discharge surface of the extinguishing gas of the exposed part is greater than the distance to the discharge surface of the extinguishing gas of the high-velocity discharge part. The injection head with soundproofing means for gas-based fire extinguishing equipment described in claim 1, characterized in that a diffusion section is provided between the orifice and the exposed section and the high-speed release section to uniformly diffuse the extinguishing gas that has passed through the orifice. An injection head with soundproofing means for gas-based fire extinguishing equipment, as described in claim 1, characterized in that the high-speed emission parts are formed at equal angular intervals on the circumferential surface of the injection head body.

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