KR102618471B1 - Fire extinguishing apparatus with high pressure mist spray type nozzle having prevent clogging for great depth underground space - Google Patents

Abstract

The present invention discloses a fire extinguishing equipment having a function of preventing clogging of a high-pressure mist nozzle for a deep underground roadway. A fire extinguishing equipment having a function of preventing clogging of a high-pressure mist nozzle for a deep underground roadway according to an embodiment of the present invention includes a housing formed with a plurality of outlets for discharging fire-fighting water supplied by being coupled to a supply line through which fire-fighting water moves; a plurality of mist nozzles each coupled to a plurality of discharge ports formed in the housing and provided with a dispersing means for spraying fire-fighting water in a mist state; and a first clogging prevention means capable of opening and closing the dispersion means of the plurality of mist nozzles, respectively. Includes.

Description

Fire extinguishing equipment with the function of preventing clogging of high-pressure mist nozzles for deep underground roads {FIRE EXTINGUISHING APPARATUS WITH HIGH PRESSURE MIST SPRAY TYPE NOZZLE HAVING PREVENT CLOGGING FOR GREAT DEPTH UNDERGROUND SPACE}

The present invention relates to a fire extinguishing equipment that has a function of preventing clogging of high-pressure fine spray nozzles for deep underground roads. More specifically, it relates to fire extinguishing equipment that finely powders fire extinguishing liquid through a fine spray nozzle equipped with anti-clogging means to prevent clogging by dust. This relates to fire extinguishing equipment that has a function of preventing clogging of high-pressure mist nozzles for deep underground tunnels that can extinguish fires by spraying without spraying.

In general, the sprinkler method is a representative method for extinguishing fires. The sprinkler system is installed on the ceiling of a building and, in the event of a fire, extinguishes the fire by spraying water supplied from the water supply line.

Recently, mist fire extinguishing equipment that minimizes water particles and sprays them in the form of mist has been developed and used. Fine spraying refers to a method of extinguishing fire using only water, where the cumulative volume distribution of 99% of the water particles emitted from the head at the minimum design pressure is sprayed to 400㎛ or less.

This mist fire extinguishing equipment emits a small amount of water at high pressure to extinguish a fire with fine water particles. The fine water particles supplied to the flame evaporate, causing a suffocation effect that reduces the oxygen concentration and cooling that lowers the temperature of the flame. It works well and has excellent fire extinguishing power.

Republic of Korea Patent Publication No. 10-0936384 discloses a mist fire extinguishing equipment.

The prior art includes a fire extinguishing water cylinder, a plurality of nozzles for spraying fire extinguishing water supplied from the fire extinguishing water cylinder, a gas cylinder supplying gas to the fire extinguishing water cylinder, a smoke detection unit, a heat detection unit, a spray pipe, and a pressurization pipe. It consists of first and second solenoid valves installed respectively, and a control unit that receives detection signals from the smoke detection unit and the heat detection unit and controls the opening of the first and second solenoid valves.

However, the fire extinguishing equipment of the prior art has a problem in that water is not sprayed because the nozzle is blocked by dust, dust, etc. in an environment where a lot of dust, dust, etc. is generated, such as a tunnel. In an emergency fire situation, if water is not sprayed from fire extinguishing equipment, it can cause enormous damage.

Republic of Korea Patent Publication No. 10-0936384

In order to overcome the problems of the prior art, one embodiment of the present invention has a high-pressure mist nozzle clogging function for deep underground roads that can prevent clogging of the nozzle with dust, dust, etc. to facilitate water spraying when a fire occurs. We would like to provide fire extinguishing equipment.

According to one aspect of the present invention, a housing coupled to a supply line through which fire-fighting water moves and formed with a plurality of discharge ports for discharging supplied fire-fighting water; a plurality of mist nozzles each coupled to a plurality of discharge ports formed in the housing and provided with a dispersing means for spraying fire-fighting water in a mist state; and a first clogging prevention means capable of opening and closing the dispersing means of the plurality of mist nozzles, respectively. It includes, when the fire-fighting water is sprayed in a mist state from the dispersing means of the spray nozzle, the first anti-clogging means is opened, and when the mist spray is stopped, the first anti-clogging means is closed.

The first clogging prevention means includes: a hemispherical first cover portion in which a first rotating portion is rotatably coupled to the housing and divided into segments; and a second cover portion rotatably coupled to the housing to form a hemispherical shape in close contact with the first cover portion in a shape symmetrical to the first cover portion. It includes, and the hemispherical internal space in which the first cover part and the second cover part are formed is sealed to seal the mist nozzle.

The mist nozzle includes a nozzle housing where one end is coupled to the discharge port of the housing to supply fire-fighting water, and a hole-shaped orifice is formed at the other end to discharge fire-fighting water; a nozzle tip built into the nozzle housing to form a flow path for fire-fighting water and generate a vortex in the fire-fighting water to discharge it to the orifice; and dispersing means for dispersing the fire-fighting water discharged through the orifice of the nozzle housing into a mist state. Includes.

According to another aspect of the present invention, a housing coupled to a supply line through which fire-fighting water moves and formed with a plurality of outlets for discharging supplied fire-fighting water; a plurality of mist nozzles each coupled to a plurality of discharge ports formed in the housing and provided with a dispersing means for spraying fire-fighting water in a mist state; and a second clogging prevention means capable of opening and closing the dispersing means of the plurality of mist nozzles. It includes, when the fire-fighting water is sprayed in a mist state from the dispersing means of the spray nozzle, the second anti-clogging means is opened, and when the mist spray is stopped, the second anti-clogging means is closed.

The second anti-blocking means includes: a third cover portion in which a third rotating portion protruding from the outer surface is rotatably coupled to a rotating shaft provided on one outer side of the housing; and a fourth cover in which a fourth rotating part protruding from the outer surface is rotatably coupled to a rotating shaft provided on one outer side of the housing, so that the ends of the third cover part are in close contact with each other in a symmetrical shape with the third cover part. wealth; It includes, and the third cover part and the fourth cover part are in close contact with the housing where the plurality of mist nozzles are installed to seal the plurality of mist nozzles.

A housing coupled to a supply line through which fire-fighting water moves and formed with a plurality of outlets for discharging supplied fire-fighting water; a plurality of mist nozzles each coupled to a plurality of discharge ports formed in the housing and provided with a dispersing means for spraying fire-fighting water in a mist state; and a third anti-clogging means respectively coupled to the dispersion means of the plurality of mist nozzles. It includes, and the third anti-clogging means is separated from the spray nozzles when fire-fighting water is sprayed in a mist state from the dispersing means of the plurality of spray nozzles.

The fire extinguishing equipment having the function of preventing clogging of high-pressure mist nozzles for deep underground roads according to the present invention has the following effects.

First, by preventing clogging of the mist nozzle, the fire can be extinguished early when a fire breaks out.

Second, firefighting water or fire extinguishing fluid can be sprayed smoothly in the form of mist.

Third, when a fire breaks out, it can be suppressed early to reduce damage and improve safety.

Figures 1 (a) and 1 (b) are diagrams of dry and wet types of fire extinguishing equipment having a function of preventing clogging of high-pressure mist nozzles in deep underground roads, respectively, according to an embodiment of the present invention.
Figure 2 is a schematic diagram schematically showing a fire extinguishing equipment having a function of preventing clogging of a high-pressure mist nozzle for a deep underground roadway according to an embodiment of the present invention.
Figure 3 is a schematic diagram showing the configuration of a spray nozzle in a fire extinguishing equipment with a function to prevent high-pressure spray nozzle clogging in a deep underground roadway according to an embodiment of the present invention.
Figure 4 is a schematic diagram schematically showing an example of operation of a means for preventing clogging of a spray nozzle in a fire extinguishing equipment having a function of preventing clogging of a high-pressure spray nozzle in a deep underground roadway according to an embodiment of the present invention.
Figure 5 is a schematic diagram showing a fire extinguishing equipment having a function of preventing clogging of a high-pressure mist nozzle in a deep underground roadway according to another embodiment of the present invention.
Figure 6 is a schematic diagram showing an example of operation of a means for preventing clogging of a mist nozzle in a fire extinguishing equipment having a function of preventing clogging of a high-pressure mist nozzle for a deep underground roadway according to another embodiment of the present invention.
Figure 7 is a schematic diagram showing a fire extinguishing equipment having a function of preventing clogging of a high-pressure mist nozzle for a deep underground roadway according to another embodiment of the present invention.

The embodiments described below are provided so that those skilled in the art can easily understand the technical idea of the present invention, and the present invention is not limited thereto. In addition, the matters expressed in the attached drawings may be different from the actual implementation form in the schematic drawings to easily explain the embodiments of the present invention.

When a component is mentioned as being connected or connected to another component, it should be understood that it may be directly connected or connected to the other component, but that other components may exist in between.

Figures 1 (a) and 1 (b) are diagrams of dry and wet types of fire extinguishing equipment with a function of preventing clogging of high-pressure mist nozzles for deep underground roads according to an embodiment of the present invention, respectively, and Figure 2 is a view of the dry and wet types of fire extinguishing equipment according to an embodiment of the present invention. It is a schematic diagram schematically showing a fire extinguishing equipment with a function of preventing clogging of a high-pressure water spray nozzle for a deep underground road according to an embodiment of the present invention, and Figure 3 is a high-pressure water spray nozzle for a deep underground road according to an embodiment of the present invention. It is a schematic diagram showing the configuration of a mist nozzle in a fire extinguishing facility with an anti-clogging function, and Figure 4 is a mist nozzle in a fire extinguishing facility with a high pressure mist nozzle anti-clogging function for a deep underground roadway according to an embodiment of the present invention. This is a schematic diagram showing an example of the operation of the clogging prevention means.

Referring to Figures 1 to 4 together, the fire extinguishing equipment (1) having a function of preventing clogging of the high-pressure mist nozzle for a deep underground roadway according to an embodiment of the present invention is a dry type fire extinguishing equipment (1) in Figure 1 (a). ) is shown, and a wet type fire extinguishing facility (2) is shown in Figure 1 (b).

Here, as an example, the fire extinguishing equipment (1) having a high-pressure mist nozzle clogging prevention function for the deep underground road in Figure 1 (a) includes a housing (100), a plurality of mist nozzles (200), and a first anti-clogging device. It is configured to include means 300.

The housing 100 has a cylindrical shape with a supply port through which fire-fighting water is supplied at one end and a passage through which fire-fighting water is supplied, and is coupled to the supply line 10 through which fire-fighting water is supplied in the event of a fire.

The housing 100 has an inclined surface 110 formed in the opposite direction to the supply line 10, and a plurality of discharge ports 120 for discharging fire-fighting water are formed on the inclined surface 110 to be spaced apart from each other. The inclined surface 110 to which the mist nozzle 200 is coupled may be formed as a flat surface.

A plurality of mist nozzles 200 are each coupled to a plurality of discharge ports 120 formed on the inclined surface 110 of the housing 100. The number of mist nozzles 200 can be added depending on the size of the housing 100 or the installation location.

The mist nozzle 200 may be configured to include a nozzle housing 210, a nozzle tip 220, a dispersing means 230, a separator 240, and a fixing member 250.

One end of the nozzle housing 210 is coupled to the outlet 120 of the housing 100 to supply fire-fighting water, and a hole-shaped orifice 211 is formed at the other end to discharge fire-fighting water.

The nozzle housing 210 is respectively coupled to the outlet 120 of the housing 100 through which fire-fighting water is discharged to discharge fire-fighting water in the event of a fire. It is screwed to the outlet 120 through one end and has a hole-shaped end at the other end. The orifice 211 is formed through the orifice 211, so that fire-fighting water is discharged through the orifice 211 when a fire occurs.

The nozzle tip 220 is a member that is built into the nozzle housing 210 and forms a flow path for fire-fighting water while generating a vortex in the fire-fighting water and guiding it to the orifice 211. The orifice 211 controls the discharge flow rate and pressure of firefighting water.

The dispersing means 230 is a component for dispersing firefighting water discharged to the orifice 211 along the outer flow path 220a in a mist state and may be configured to include a protruding nipple 231 and a recessed portion 232. .

The protruding nipple 231 has a structure that partially protrudes out of the nozzle housing 210 through the orifice 211, and protruding protrusions 231a are formed on both sides.

The protruding nipple 231 disperses the fire-fighting water to both sides as the protruding jaw 231a collides with the fire-fighting water discharged to the orifice 211 through the outer flow passage 220a.

Accordingly, the firefighting water may be dispersed into fine particles and spread in a mist state by collision with the protruding jaw 231a formed on the protruding nipple 231.

The depression 232 is formed in a depressed state at the bottom of the nozzle housing 210 to accommodate the protruding nipple 231 in a protruding state, and the depression 232 collides with the protruding ledge 231a to disperse firefighting water. It provides a dispersion space and additionally disperses the fire-fighting water by additionally colliding with the dispersed fire-fighting water.

Due to this structure, firefighting water can more smoothly disperse into fine particles and spread in a mist state.

The first clogging prevention means 300 includes a first cover part 310 and a second cover part 320.

The first cover part 310 has a hemispherical shape in which the first rotating part 312 is rotatably coupled to the inclined surface 110 of the housing 100 and divided into parts. The first rotating part 312 protrudes from the first cover part 310 to one side.

The second cover part 320 is rotatably coupled to the second rotating part 322 on the inclined surface 110 of the housing 100, and has a shape symmetrical to the first cover part 310. It adheres closely to form a hemisphere. The second rotating part 322 protrudes from the second cover part 320 to one side.

The protruding part 112 of the inclined surface 110 is formed with a protruding protrusion in the lateral direction, and the first rotating part 312 of the first cover part 310 and the second rotating part 322 of the second cover part 320 A hole for inserting a protrusion is drilled on the side. The protruding protrusion is inserted into the protrusion insertion hole, and a torsion spring that provides elastic force is coupled to the protruding protrusion, so that the first cover part 310 and the second cover part 320 can rotate. The first cover part 310 and the second cover part 320 can be rotated to open and close in the up and down directions, and are not limited to a specific rotation structure as long as they have a structure that seals the mist nozzle 200.

The first cover part 310 and the second cover part 320 are in close contact with each other and the inclined surface 110 of the housing 100, thereby sealing the hemispherical internal space. The mist nozzle 200 is located in the internal space formed by the first cover part 310 and the second cover part 320 and is sealed from the outside.

Accordingly, the first clogging prevention means 300 enables the dispersion means 230 of the plurality of mist nozzles 200 to be opened and closed, respectively.

Referring to FIGS. 1 to 4 together to explain the operational relationship of the fire extinguishing equipment (1) with a high-pressure mist nozzle clogging function for a deep underground road according to an embodiment of the present invention, first, in the supply line (10) Fire extinguishing equipment (1) is installed.

The fire extinguishing equipment (1) has a plurality of mist nozzles (200) installed in the housing (100), and a first clogging prevention means (300) is installed in each of the plurality of mist nozzles (200).

When a fire occurs, water is supplied to the fire extinguishing equipment (1) through the supply line (10), and the fire-fighting water is sprayed in a mist state from the dispersing means (230) of the spray nozzle (200).

When fire-fighting water is sprayed in a mist state from the dispersion means 230 of the mist nozzle 200, the first anti-clogging means 300 is opened, and the first cover part 310 is rotated in the first rotating part 312. , the second cover part 320 rotates in the second rotation part 322 in a direction opposite to the rotation direction of the first cover part 310.

When the first anti-clogging means (300) is opened and the fire-fighting water is sprayed in a mist state, and the mist spray is stopped, the first anti-clogging means (300) is returned to its initial state by the first rotating part (312) and the second rotating part (322). is closed with

Figure 5 is a schematic diagram showing a fire extinguishing equipment having a function of preventing clogging of a high-pressure water mist nozzle for a deep underground road according to another embodiment of the present invention, and Figure 6 is a schematic diagram showing a high-pressure water spray nozzle for a deep underground road according to another embodiment of the present invention. This is a schematic diagram showing an example of the operation of a means for preventing clogging of a mist nozzle in a fire extinguishing facility with an anti-clogging function.

Referring to FIGS. 5 and 6 together with FIGS. 1 to 4, the fire extinguishing equipment (3) having a function of preventing clogging of the high-pressure mist nozzle for a deep underground roadway according to another embodiment of the present invention includes a housing (100) and a plurality of It is comprised of a mist nozzle 200 and a second clogging prevention means 301.

The housing 100 is coupled to the supply line 10 in a cylindrical shape with a supply port through which fire-fighting water is supplied at one end and a passage through which fire-fighting water is supplied is formed inside.

A plurality of mist nozzles 200 are each coupled to a plurality of discharge ports 120 formed on the inclined surface 110 of the housing 100.

The second clogging prevention means 301 has a structure capable of simultaneously opening and closing the dispersing means 230 of the plurality of mist nozzles 200.

The second clogging prevention means 301 includes a third cover part 330 and a fourth cover part 340.

On one outer side of the housing 100, a rotation shaft 332 is provided toward the axial direction. The rotation axis 332 allows the third cover part 330 and the fourth cover part 340 to rotate. The rotation axis 332 includes a third rotating part that protrudes on one side of the outer surface of the third cover part 330, and a third rotating part that protrudes on one side of the outer surface of the fourth cover part 340 and is spaced apart from the third rotating part. The fourth rotating part is coupled so that the third cover part 330 and the fourth cover part 340 can rotate in opposing lateral directions with respect to the housing 100.

In addition, a torsion spring 334 is coupled to the rotation axis 332 to provide elasticity to the outer surfaces of the third cover part 330 and the fourth cover part 340 in a direction opposite to the respective opening direction. At the end of the rotating shaft 332, a fixture that functions as a rivet or nut is coupled.

The third cover portion 330 and the fourth cover portion 340 are in close contact with the housing 100 where the plurality of mist nozzles 200 are installed to seal the plurality of mist nozzles 200. The third cover part 330 and the fourth cover part 340 cover the inclined surface 110 of the housing 100 so that the plurality of mist nozzles 200 can be sealed from the outside.

The torsion spring 334 is coupled and fixed to the rotating shaft 332, and when the third cover part 330 and the fourth cover part 340 are opened to expose the plurality of mist nozzles 200, the torsion spring 334 Both ends of are compressed to provide elastic force in opposite directions to the third cover part 330 and the fourth cover part 340.

The fire extinguishing equipment (3), which has a function of preventing clogging of the high-pressure mist nozzle for a deep underground road according to another embodiment, is supplied with water through the supply line (10) when a fire occurs, thereby dispersing the spray nozzle (200). Firefighting water is sprayed in a mist state.

When fire-fighting water is sprayed in a mist state from the dispersing means 230 of the plurality of mist nozzles 200, the second anti-clogging means 301 is opened by the pressure generated, and the third cover portion 330 and the third cover portion 330 4 The cover portion 340 is rotated in opposite directions by the rotation shaft 332.

When the mist spray by the plurality of mist nozzles 200 is stopped, the third cover portion 330 and the fourth cover portion 340 are connected by the elastic force of the torsion spring 334. The plurality of mist nozzles 200 are closed together by rotating in a direction opposite to the opening rotation direction of the unit 340, and descriptions of other identical parts will be omitted.

Figure 7 is a schematic diagram showing a fire extinguishing equipment having a function of preventing clogging of a high-pressure mist nozzle for a deep underground roadway according to another embodiment of the present invention.

Referring to FIG. 7 together with FIGS. 1 to 4, the fire extinguishing equipment (4) having a function of preventing clogging of high-pressure mist nozzles for deep underground roads according to another embodiment includes a housing (100) and a plurality of mist nozzles (200). ) and a third anti-clogging means (302).

The third anti-clogging means (302) is each coupled to a plurality of mist nozzles (200). The third anti-clogging means (302) has a cylindrical shape made of a material with stretchable elasticity, and is an extension extending in one direction from the outer periphery. A portion 350 is formed, and an insertion hole 354 is drilled toward the inside from the central portion of one end portion.

The extension part 350 is coupled to surround the mist nozzle 200 to seal it, and the insertion hole 354 is in close contact with the recessed part 232 to reinforce the sealing of the dispersing means 230.

The plurality of third clogging prevention means 302 are respectively coupled to the plurality of water spray nozzles 200 to enable opening and closing of the water spray nozzles 200, respectively.

In the event of a fire, the fire extinguishing equipment (4) having a function of preventing clogging of high-pressure mist nozzles in a deep underground roadway according to another embodiment has a third anti-clogging means (302) dispersing means (230) of a plurality of mist nozzles (200). ), the third anti-clogging means (302) is separated from the mist nozzle (200) by the pressure generated when the fire fighting water is sprayed in a mist state. Then, the fire-fighting water is sprayed in a mist state in the dispersion means 230 to extinguish the fire.

Therefore, the fire extinguishing equipment that has the function of preventing clogging of the high-pressure fine spray nozzle for deep underground roads according to the present invention can prevent the clogging of the fine spray nozzle and extinguish the fire early when a fire occurs, and the fire fighting water or fire extinguishing fluid is smoothly discharged in the form of mist. It can be sprayed easily. In addition, when a fire breaks out, it can be extinguished early, reducing damage and improving safety.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above are merely presented by selecting the most preferred embodiments among various possible embodiments to aid the understanding of those skilled in the art, and the technical idea of this invention is not necessarily limited or limited only by the presented embodiments. Rather, it is stated that various changes, additions, and changes are possible without departing from the technical spirit of the present invention, as well as other equivalent embodiments.

1, 2, 3, 4: Fire extinguishing equipment
10: Supply line
100: housing
110: slope
112: protrusion
120: outlet
200: Fine spray nozzle
210: nozzle housing
211: Orifice
220: nozzle tip
220a: Outer Euro
230: means of dispersion
231: Protruding nipple
231a: Protruding jaw
232: depression
240: Separator
250: Fixing member
300: First clogging prevention means
310: first cover portion
312: first rotating part
320: second cover part
322: second rotating part
330: Third cover portion
332: rotation axis
334: Torsion spring
340: Fourth cover part
350: extension part
354: extension

Claims (6)

A housing coupled to a supply line through which fire-fighting water moves, and having an inclined surface formed in the opposite direction of the supply line and having a plurality of discharge ports for discharging the supplied fire-fighting water;
a plurality of mist nozzles each coupled to a plurality of outlets formed on an inclined surface of the housing and provided with a dispersion means for spraying fire-fighting water in a mist state; and
a first clogging prevention means capable of opening and closing the dispersing means of the plurality of mist nozzles, respectively; Including,
The first clogging prevention means is,
a first cover part having a hemispherical shape in which a first rotating part is rotatably coupled to the housing and divided into segments; and
a second rotating part rotatably coupled to the housing, a second cover part having a shape symmetrical to the first cover part and forming a hemispherical shape in close contact with the first cover part; Including,
A hemispherical internal space formed by the first cover part and the second cover part being in close contact with an inclined surface of the housing is sealed to seal the mist nozzle,
When fire-fighting water is sprayed in a mist state from the dispersion means of the spray nozzle, the first cover part of the first anti-clogging means is rotated in the first rotating part, and the second cover part is rotated in the second rotating part and opened. When the fine spray is stopped, the first clogging prevention means is closed.
Fire extinguishing equipment that prevents clogging of high-pressure mist nozzles for deep underground roads. delete According to claim 1,
The fine spray nozzle is,
a nozzle housing whose one end is coupled to the discharge port of the housing to supply fire-fighting water, and where a hole-shaped orifice is formed at the other end to discharge fire-fighting water;
A nozzle tip built into the nozzle housing to form a flow path for fire-fighting water and generate a vortex in fire-fighting water to discharge it to the orifice; and
Dispersing means for dispersing the fire-fighting water discharged through the orifice of the nozzle housing into a mist state; Characterized by including
Fire extinguishing equipment that prevents clogging of high-pressure mist nozzles for deep underground roads. A housing coupled to a supply line through which fire-fighting water moves and formed with a plurality of outlets for discharging supplied fire-fighting water;
a plurality of mist nozzles each coupled to a plurality of discharge ports formed in the housing and provided with a dispersion means for spraying fire-fighting water in a mist state; and
a second clogging prevention means capable of opening and closing the dispersing means of the plurality of mist nozzles; Including,
The second clogging prevention means is,
a third cover portion rotatably coupled to a third rotating portion protruding from the outer surface of the rotating shaft provided on one outer side of the housing; and
A fourth rotating part protruding from the outer surface is rotatably coupled to a rotating shaft provided on one outer side of the housing, so that the ends of the third cover part are in close contact with each other in a symmetrical shape with the third cover part. ; Including,
The third cover portion and the fourth cover portion are in close contact with the housing where the plurality of mist nozzles are installed to seal the plurality of mist nozzles,
When fire-fighting water is sprayed in a mist state from the dispersing means of the plurality of mist nozzles, the second anti-clogging means is opened, and when the mist spraying is stopped, the second anti-clogging means is closed and the dispersing means of the plurality of mist nozzles is closed. Characterized by being able to open and close at the same time
Fire extinguishing equipment that prevents clogging of high-pressure mist nozzles for deep underground roads. delete delete

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