JP4066130B2 - Bubble fire extinguishing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foam fire-extinguishing equipment that mixes and discharges fire-extinguishing water and a foam fire-extinguishing agent.
[0002]
[Prior art]
FIG. 2 is an explanatory view showing a conventional foam fire extinguishing equipment. In FIG. 2, reference numeral 1 denotes a water receiving tank for storing fire extinguishing water 1a. Reference numeral 2 denotes a fire extinguishing pump that pressurizes and flows out the water for fire extinguishing 1a in the water receiving tank 1. Reference numeral 3 denotes a primary side pipe through which pressurized fire-extinguishing water 1a flows.
[0003]
Reference numeral 4 denotes a foam fire extinguishing agent tank in which the foam extinguishing agent 4a is stored. The foam extinguishing agent tank 4 is separated into an inner chamber and an outer chamber by a diaphragm 4b. And the foam fire extinguishing agent 4a is stored in the inner chamber. On the other hand, a branch pipe 8 branched from the primary side pipe 3 is connected to the outer chamber, and when extinguishing the fire extinguishing water 1a pressurized by the fire extinguishing pump 2 flows into the outer chamber at a predetermined pressure. The foam extinguishing agent 4a stored in the inner chamber is pushed by this pressure and flows out to the foam extinguishing agent supply pipe 9 at a predetermined pressure.
[0004]
Reference numeral 5 denotes a mixer such as a venturi structure provided at the end of the primary side pipe 3. A foam fire-extinguishing agent supply pipe 9 is connected to the mixer 5, and the fire-extinguishing water 1a and the foam-extinguishing agent 4a are mixed at a predetermined ratio to generate a foam-extinguishing liquid (aqueous solution). Reference numeral 6 denotes a secondary side pipe connected to the secondary side of the mixer 5 and through which the generated foam fire-extinguishing liquid flows. An injection means such as a sprinkler head is provided at the tip of the secondary side pipe 6.
[0005]
Furthermore, 21 is a pressure air tank connected to the end of the primary side pipe 3. PS 3 and PS 4 are pressure switches attached to the pressure air tank 21. PS4 is set to operate at a lower pressure than PS3. 22 is a small auxiliary pump for supplying the fire water 1a to the pressurized air tank 21. The pressure air tank 21 contains trapped air and fire-extinguishing water 1a filled below the air. The pressure air tank 21 flows out the fire-extinguishing water 1a into the primary side pipe 3 at a predetermined pressure with the pressure of air. When the pressure in the primary side pipe 3 becomes a predetermined pressure or less due to leakage or the like, the pressure switch PS3 is turned ON, the auxiliary pump 22 is operated via an auxiliary pump starting panel (not shown), and the pressure switch PS3 is connected to the pressure air tank 21. The fire-extinguishing water 1a is filled up to a predetermined pressure to be turned off.
[0006]
Furthermore, 12 is an expiratory tank for supplying expiratory water 12 a to the fire extinguishing pump 2 and the auxiliary pump 22. Further, 17 is a plurality of gate valves and check valves provided at predetermined positions of the pipe. Reference numeral 18 denotes a valve provided in the branch pipe.
[0007]
In the foam fire extinguishing equipment having such a configuration, during fire extinguishing, for example, a sprinkler head (not shown) is opened by fire heat, and the foam fire extinguishing liquid in the secondary side pipe 6 is released by the air pressure of the pressure air tank 21. At this time, the pressure in the pressure air tank 21 drops rapidly and the pressure switches PS3 and PS4 are turned on. When the PS 4 is turned on, the fire extinguishing pump 2 is operated via a pump starter (not shown), and the fire extinguishing water 1a is pressurized and flows out to the primary side pipe 3. Next, the mixer 5 mixes the fire-extinguishing water 1a and the foam-extinguishing chemical 4a at a predetermined ratio to generate a foam-extinguishing liquid. And the produced | generated foam extinguishing liquid is injected from injection means, such as a sprinkler head, and extinguishes a fire.
[0008]
FIG. 3 is an explanatory view showing another example of the conventional foam fire extinguishing equipment. In the conventional example of FIG. 2 described above, a branch pipe 8 branched from the primary side pipe 3 is connected to the outer chamber of the foam extinguishing agent tank 4. Therefore, even when the fire extinguishing pump 2 is not operating, the pressure from the pressurized air tank 21 works. On the other hand, in the conventional example of FIG. 3, the branch pipe 19 connected to the outer chamber of the foam fire-extinguishing chemical tank 4 extends from the fire-extinguishing pump 2. Therefore, in the conventional example of FIG. 3, pressure does not act on the foam fire-extinguishing chemical tank 4 unless the fire-extinguishing pump 2 is operated.
[0009]
[Problems to be solved by the invention]
With regard to the conventional foam extinguishing equipment having such a configuration, generally, the foam extinguishing liquid (aqueous solution) leaks little by little from piping such as a sprinkler head, that is, a joint portion of the secondary side piping 6. And, for example, in the foam fire extinguishing equipment of FIG. 2, since pressure is reduced when such foam fire extinguishing liquid leaks, the pressure switch PS3 is turned on, and the auxiliary pump 22 is actuated to operate in the primary side pipe 3 and the secondary side pipe 6. Keep the monitoring pressure constant. However, the flow rate of the fire-extinguishing water 1a flowing to the mixer 5 at this time is very small, and the mixer 5 absorbs the foam fire-extinguishing agent 4a from the foam-extinguishing agent tank 4 and does not reach a prescribed flow rate that can be mixed. . Therefore, the foam fire-extinguishing agent 4a is not mixed with the fire-extinguishing water 1a, and the concentration of the foam-extinguishing liquid (aqueous solution) in the secondary pipe 6 connected to the secondary side of the mixer 5 is the fire-extinguishing water 1a. However, since the foam extinguishing agent 4a is not supplied, there is a problem that it becomes thinner with the passage of time and falls from the specified concentration.
[0010]
Further, in the foam extinguishing equipment shown in FIG. 3, the auxiliary pump 22 operates in the same way at the time of leakage from the sprinkler pipe to keep the monitoring pressure constant, but the auxiliary pump 22 pressurizes the foam extinguishing chemical tank 4. do not do. For this reason, the foam extinguishing agent 4 a is not mixed in the mixer 5, and only the fire-extinguishing water 1 a flows into the secondary side pipe 6, and there is a problem that the concentration on the secondary side of the mixer 5 decreases with time.
[0011]
2 and 3, the water pipe volume (volume) from the mixer 5 to the auxiliary pump 22 and the pressurized air tank 21 may increase in the equipment, Since the liquid is in a water-flowing state, depending on the effect of the drop in the equipment piping, depending on the standing time, there may be a tendency to replace the aqueous solution on the secondary side of the mixer 5 and reduce its concentration. Met.
[0012]
This invention was made in order to solve the above problems, and it aims at obtaining the foam fire extinguishing equipment which can suppress the density | concentration fall of the mixer secondary side in leakage.
[0013]
[Means for Solving the Problems]
The foam fire-extinguishing equipment according to the present invention includes a fire-extinguishing pump that pressurizes and flows out fire-extinguishing water from a water-receiving tank, a primary side pipe through which the pressurized fire-extinguishing water flows, and a foam fire-extinguishing chemical tank in which foam extinguishing chemical is stored And mixing at a predetermined ratio of water for extinguishing fire and foam extinguishing agent provided at the end of the primary side pipe, and connected to the secondary side of the mixer for foam extinguishing, for foam extinguishing Connected to the secondary side piping through which the liquid flows and the secondary side piping, the aqueous solution of foam extinguishing agent is stored inside, the aqueous solution is discharged with compressed air , and the aqueous solution is supplied into the secondary side piping A pressure air tank having a predetermined pressure in the secondary side pipe, and a priming tank in which the aqueous solution is stored, and an auxiliary pump provided between the pressure air tank and the priming tank , In the pressurized air tank, the auxiliary pump is activated when the pressure in the secondary pipe falls below the specified pressure, and stored in the expiratory tank. A first pressure switch for pressurizing the filled aqueous solution and filling the pressure air tank, and set to operate at a pressure lower than the pressure at which the first pressure switch operates, and catches the decompression at the time of fire in the secondary side pipe And a second pressure switch for operating the fire pump .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is an explanatory view showing the foam fire extinguishing equipment of the present invention. In FIG. 1, fire fighting water 1 a is stored in a water receiving tank 1. The fire extinguishing pump 2 pressurizes the fire extinguishing water 1 a from the water receiving tank 1 and flows out to the primary side pipe 3. On the other hand, the foam fire extinguishing agent tank 4 stores the foam extinguishing agent 4a.
[0017]
The foam extinguishing agent tank 4 is separated into an inner chamber and an outer chamber by a diaphragm 4b. And the foam fire extinguishing agent 4a is stored in the inner chamber. On the other hand, a branch pipe 8 branched from the primary side pipe 3 is connected to the outer chamber, and fire extinguishing water 1a pressurized by the fire extinguishing pump 2 flows at a predetermined pressure during fire extinguishing. Due to this pressure, the foam extinguishing agent 4a stored in the inner chamber flows out into the foam extinguishing agent supply pipe 9 at a predetermined pressure.
[0018]
A mixer 5 is connected to the end of the primary side pipe 3 opposite to the fire pump 2. The mixer 5 includes a proportional mixing mechanism, for example, a venturi pipe, and a foam extinguishing agent supply pipe 9 extending from the foam extinguishing agent tank 4 is connected to the venturi pipe. A secondary side pipe 6 is connected to the secondary side of the mixer 5. The mixer 5 mixes the fire-extinguishing water 1a and the foam fire-extinguishing agent 4a at a predetermined ratio in a venturi tube to generate a foam-extinguishing liquid (aqueous solution 7a). And the produced | generated foam fire extinguishing liquid distribute | circulates the secondary side piping 6, and is injected from injection means, such as a sprinkler head provided in the front-end | tip of the secondary side piping 6. FIG.
[0019]
The secondary side pipe 6 is connected to a pressure air tank 7 as an aqueous solution supply means. PS1 and PS2 are pressure switches attached to the pressure air tank 7. PS2 is set to operate at a lower pressure than PS1, and is a pressure switch that activates the fire extinguishing pump via a pump starter (not shown) that catches the reduced pressure when the sprinkler head discharges in the event of a fire. is there. The pressure air tank 7 stores the aqueous solution 7a therein, and fills the secondary side pipe 6 with the aqueous solution 7a having a predetermined pressure by the pressure of the air compressed inside. The aqueous solution 7a is the same as the mixture of the fire-extinguishing water 1a and the foam fire-extinguishing agent 4a by the mixer 5.
[0020]
Further, the pressure air tank 7 is connected via an auxiliary pump 14 to a priming tank 13 that also serves as a water supply tank that is provided at a position higher than the auxiliary pump 14 and stores the aqueous solution 7a. Reservoir aqueous solutions 7a to call the aquarium 13, the secondary pipe 6 falls below a predetermined pressure, the auxiliary pump 14 is actuated through the PS1 is not shown by ON auxiliary pump start board, whereby the pressure The air tank 7 and the secondary pipe 6 are pressurized and filled.
[0021]
The fire pump 2 is connected to a priming tank 12 and supplied with priming water 12a. A check valve 17 and a valve 18 are provided at predetermined positions of the piping.
[0022]
In the foam fire-extinguishing equipment having such a configuration, an aqueous solution supply means (pressure air tank 7) connected to the secondary side pipe 6 for storing the aqueous solution therein and supplying the aqueous solution 7a into the secondary side pipe 6 is provided. Since it is provided, the density | concentration fall in the secondary side piping 6 can be suppressed. Moreover, the pressurized air tank 7 is connected to the secondary side pipe 6, and the aqueous solution 7 a in the pressurized air tank 7 is also filled with the mixture of the fire-extinguishing water 1 a and the foam fire-extinguishing agent 4 a by the mixer 5. Therefore, even if the exhalation tank 13 and the auxiliary pump 14 are omitted, the foam fire extinguishing equipment of the present configuration is established.
[0023]
Moreover, in the foam fire-extinguishing equipment having such a configuration, the auxiliary pump 14 and the pressure air tank 7 provided on the primary side of the mixer 5 are provided on the secondary side of the mixer 5 so that the primary of the mixer 5 is provided. The volume (volume) of the side pipe can be reduced, the amount of water leaking to the secondary side through the mixer 5 can be reduced, and the concentration decrease on the secondary side of the mixer 5 can be further suppressed. Can do.
[0024]
The foam fire-extinguishing equipment according to the present invention includes a fire-extinguishing pump that pressurizes and flows out fire-extinguishing water from a water-receiving tank, a primary side pipe through which the pressurized fire-extinguishing water flows, and a foam fire-extinguishing chemical tank in which foam extinguishing chemical is stored And mixing at a predetermined ratio of water for extinguishing fire and foam extinguishing agent provided at the end of the primary side pipe, and connected to the secondary side of the mixer for foam extinguishing, for foam extinguishing Connected to the secondary side piping through which the liquid flows and the secondary side piping, the aqueous solution of foam extinguishing agent is stored inside, the aqueous solution is discharged with compressed air , and the aqueous solution is supplied into the secondary side piping A pressure air tank having a predetermined pressure in the secondary side pipe, and a priming tank in which the aqueous solution is stored, and an auxiliary pump provided between the pressure air tank and the priming tank , In the pressurized air tank, the auxiliary pump is activated when the pressure in the secondary pipe falls below the specified pressure, and stored in the expiratory tank. PS1 to pressurize the aqueous solution and fill the pressure air tank, and set to operate at a pressure lower than the pressure at which PS1 operates, catches the decompression at the time of fire in the secondary pipe, and operates the fire pump PS2 and are attached. Therefore, it is possible to suppress a decrease in the concentration of the aqueous solution in the secondary side pipe and to keep the pressure of the aqueous solution in the secondary side pipe constant . Moreover, the aqueous solution of a pressure air tank is supplied as needed, and it can be set as the foam fire extinguishing equipment which does not require a long-term maintenance.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a foam fire extinguishing facility according to the present invention.
FIG. 2 is an explanatory view showing a conventional foam extinguishing equipment.
FIG. 3 is an explanatory view showing another example of conventional foam fire extinguishing equipment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water receiving tank, 1a Fire extinguishing water, 2 Fire extinguishing pump, 3 Primary side piping, 4 Foam fire extinguishing chemical tank, 4a Foam extinguishing chemical, 5 Mixer, 6 Secondary side piping, 7 Pressure air tank (aqueous solution supply means), 7a Aqueous solution , 13 Expiratory tank, 14 Auxiliary pump.

Claims (1)

A fire-extinguishing pump that pressurizes and flows out fire-fighting water from a water receiving tank;
A primary pipe through which the pressurized fire-fighting water flows;
A foam fire extinguishing agent tank in which foam extinguishing agent is stored;
A mixer that is provided at an end of the primary side pipe and mixes the fire-extinguishing water and the foam-extinguishing chemical at a predetermined ratio, and generates a foam-extinguishing liquid;
A secondary pipe connected to the secondary side of the mixer and through which the liquid for foam extinguishing flows;
It is connected to the secondary pipe, and liquid storage of the aqueous solution of the fire-extinguishing foams therein, by flow out the solution in compressed air, by supplying the aqueous solution in the secondary side in the pipe, the secondary A pressure air tank with a predetermined pressure in the side pipe ;
A priming tank in which the aqueous solution is stored is connected, and includes an auxiliary pump provided between the pressurized air tank and the priming tank ,
In the pressure air tank,
A first pressure switch that activates the auxiliary pump when the pressure in the secondary side pipe falls below the predetermined pressure, pressurizes the aqueous solution stored in the expiratory tank, and fills the pressurized air tank;
A second pressure switch which is set to operate at a pressure lower than the pressure at which the first pressure switch operates, catches the pressure reduction during the fire in the secondary side pipe, and operates the fire extinguishing pump;
Foam extinguishing equipment, characterized in that is installed.

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