JP3928201B2 - Fire extinguishing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to air and fire extinguishing liquid (water, foam fire extinguishing agent) in a fire extinguishing equipment piping (including joints, strainers, valves, etc.) such as pre-actuated sprinkler fire extinguishing equipment, dry sprinkler fire extinguishing equipment, or dry foam extinguishing equipment. It is related to a fire extinguishing facility in which an aqueous solution, a strengthening solution, etc.
[0002]
[Prior art]
For example, in a pre-actuated sprinkler fire extinguishing facility, a facility water discharge test must be performed immediately after the facility construction. This water discharge test is performed according to the following procedure.
First, the equipment is placed in a warning state, and the alarm valve is opened by opening a manual start valve arranged in parallel with the motor-operated valve that is opened by the operation of the fire detector.
Then, water for fire extinguishing is sent to the secondary pipe of the alarm valve, and the operation of the alarm valve can be confirmed, that is, the presence or absence of a water discharge alarm can be confirmed. At this time, the fire-extinguishing water also enters the falling pipe that connects the closed sprinkler and the secondary pipe.
As it is, the end test valve is opened, and a dummy water discharge is performed for one head, and it is checked whether a pressure higher than a predetermined pressure is applied to the end test valve at the farthest point.
[0003]
After this water discharge test, the alarm valve is closed by closing the manual start valve.
At the same time, for example, the water for fire extinguishing in the secondary side pipe is almost discharged from the end test valve by the air compressor set to 1 kg / cm ² .
When finished, close the end test valve and open the drain valve around the alarm valve to drain the fire extinguishing water in the secondary vertical pipe immediately after the alarm valve.
[0004]
[Problems to be solved by the invention]
However, fire-extinguishing water stays in the falling pipe and cannot be removed, resulting in residual water. This residual water is combined with oxygen in the compressed air from the air compressor to cause rust on the meniscus portion of the residual water in the falling pipe. Therefore, this rust is peeled off at the time of fire extinguishing, and the water outlet part of the sprinkler head may be clogged, or a hole may be formed in the fire extinguishing equipment piping when corrosion progresses.
Further, the compressed air within the secondary side piping to exit the threaded connection of the pipe, a predetermined pressure, for example, becomes below 0.7 Kg / cm ^2, moving the tossed compressor in operation of pressure switch for monitoring the pressure drop alarm , Always keep a constant pressure.
If it is early, the pressure is increased by an air compressor every 2 to 3 hours, usually once a day. Since this pressurization always injects fresh air, that is, oxygen, corrosion does not stop.
[0005]
In view of the above circumstances, an object of the present invention is to prevent the fire extinguishing equipment piping from being rusted.
[0006]
The present invention, the meniscus portion of the residual fire extinguishing liquid portion generated in fire extinguishing equipment in the pipe, a fire-extinguishing equipment will covered with nitrogen gas; after the water discharge test, the residual fire extinguishing liquid by nitrogen gas sub-tank and a nitrogen gas generator First, nitrogen gas in the sub-tank is supplied into the pipe, then nitrogen gas is supplied from the nitrogen gas generator into the pipe, and gas pressure in the pipe is supplied. The fire extinguishing equipment is characterized in that the gas in the pipe is replenished with the nitrogen gas generated by the nitrogen gas generating device when the temperature decreases.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Cover the meniscus part of the residual fire extinguishing liquid part generated in the fire extinguishing equipment piping with inert gas. This pipe is filled with air and fire-extinguishing liquid (water, foam fire-extinguishing chemical aqueous solution, strengthening liquid, etc.) in the same way as pre-actuated sprinkler fire extinguishing equipment, dry sprinkler fire extinguishing equipment, dry foam fire extinguishing equipment, etc. Fire extinguishing equipment piping.
[0008]
The residual fire extinguishing liquid part is generated, for example, in a take-off pipe part that connects the secondary side pipe and the closed sprinkler head, a bent part of the horizontal pipe, and an intersection part of the L-shaped pipe.
[0009]
For example, nitrogen gas, argon, neon, helium or the like is used as the inert gas. When covering the meniscus part of the residual fire extinguishing liquid part with nitrogen gas, for example, the nitrogen gas generator is connected to the secondary side pipe to supply the nitrogen gas, and the nitrogen gas is sealed in the falling pipe. An appropriate method is adopted depending on the situation. For example, after the inside of the secondary pipe is evacuated, nitrogen gas may be supplied from the sub tank to the secondary side pipe, and then nitrogen gas may be supplied from the nitrogen gas generator.
[0010]
【Example】
A first embodiment of the present invention will be described with reference to FIGS.
An inert gas, for example, nitrogen gas N ₂ G is sealed in the secondary side pipe 2 of the alarm valve 1 of the pre-actuated sprinkler fire extinguishing equipment. The pipe 2 is provided with a closed sprinkler head SP and a terminal test valve 4.
[0011]
The closed sprinkler head SP is connected to the secondary side pipe 2 via the falling pipe 6. The secondary pipe 2 is connected to the N ₂ gas generator 10 via the regulator 8.
[0012]
For example, an adsorbent that is a kind of activated carbon is used as the N ₂ gas generator 10, and the remaining nitrogen molecules are pushed into the pores on the surface of the adsorbent by using the difference in diameter between the nitrogen molecules and the oxygen molecules. A method of taking out is used.
Regulator 8 is for setting the pressure of the secondary side piping 2 to a predetermined pressure, for example, lowering the gas pressure of 4 Kg / cm ² to 1Kg / cm ^2. The speed controller 12 limits the gas supply amount to the secondary side pipe 2 to a predetermined amount.
[0013]
In FIG. 1, 11 is an air filter, 13 is a check valve, 14 is a pressure switch for monitoring pressure drop alarm, 15 is a drain valve, 16 is a pressure switch for water discharge alarm, 18 is a piston chamber, 19 is an orifice, 20 Indicates a check valve, 21 indicates a control valve, 22 indicates a solenoid valve, 23 indicates a pre-action control panel, 24 indicates a fire receiver, 25 indicates a fire detector, and 26 indicates a manual activation valve.
[0014]
Next, the operation of this embodiment will be described separately for each case.
During monitoring:
The facility monitoring pressure is always applied to the primary side pipe 2A and the piston chamber 18 of the alarm valve 1, and the monitoring compressed gas pressure is applied to the secondary side thereof.
The electromagnetic valve 22 is normally closed, the pressure in the piston chamber 18 is maintained, and the alarm valve 1 is closed.
[0015]
During the test:
When the water discharge test is performed, the manual activation valve 26 is opened and the alarm valve 1 is opened.
Then, fire extinguishing water is sent to the secondary pipe 2 of the alarm valve 1 and the pressure switch 16 is operated, so that the operation of the alarm valve 1 can be confirmed, that is, whether or not there is a water discharge alarm.
At this time, fire-fighting water also enters the falling pipe 6 that connects the closed sprinkler head SP and the secondary pipe 2.
[0016]
As it is, the end test valve 4 is opened, a dummy water discharge is performed for one closed sprinkler head SP, and it is checked whether or not a pressure higher than a predetermined pressure is applied to the end test valve 4 at the farthest point.
[0017]
After this water discharge test, the alarm valve is closed by closing the manual start valve 26, and after draining from the test valve 4 by N2 gas pressure, the test valve 4 is closed and the drain valve 15 around the alarm valve 1 is closed. Open and discharge the fire-fighting water in the secondary vertical pipe immediately after the alarm valve 1.
[0018]
At this time, the fire-extinguishing water W in the secondary side pipe 2 remains in the residual fire extinguishing liquid part 30 and cannot be completely discharged. This residual fire extinguishing liquid part 30 is, for example, the bending of the falling pipe 6 shown in FIGS. 2 and 3, that is, the lower vertical pipe part 2Y of the T-shaped pipe 2T, and the horizontal pipe 2F shown in FIGS. It occurs at the portion 2Z, the intersection 2X of the L-shaped pipe 2L shown in FIG. The horizontal pipe portion 2f of the L-shaped pipe 2L is inclined with respect to the horizontal line F.
[0019]
The N ₂ gas generator 10 is driven to fill the secondary pipe 2 with nitrogen gas N ₂ G, and the inside of the pipe ² is maintained at a predetermined gas pressure, for example, 1 Kg / cm ² .
[0020]
At this time, since the nitrogen gas N ₂ G covers the meniscus portion M of the residual fire extinguishing liquid portion 30, no rust is generated in the meniscus portion M.
[0021]
In case of fire:
If water is passed through the secondary side pipe 2 in the event of a fire, a residual fire extinguishing liquid part is generated as in the test, but rusting is prevented by covering the meniscus part of the residual fire extinguishing liquid part with nitrogen gas as in the test. be able to.
[0022]
The operation of the fire extinguishing equipment in the event of a fire will be briefly described.
When a fire occurs, the fire detector is activated first, and the motor-operated valve 22 is opened by the operation of the fire receiver 24 and the pre-action control panel 23 according to the signal.
When the motor-operated valve 22 is opened, the pressurized water in the piston chamber 18 is discharged.
At this time, a small amount of primary pressure is supplied via the orifice 19, but since the amount of drainage from the motor operated valve 22 is large, the pressure in the piston chamber 18 decreases and the alarm valve 1 opens.
[0023]
When the alarm valve 1 is opened, pressure water flows into the secondary side, and water is passed from the valve seat to the pressure switch 16 to issue a water discharge alarm. Further, when the fire progresses, the closed sprinkler head SP is opened by the heat, and after discharging the nitrogen gas N ₂ G, water discharge is started.
[0024]
When the pressure in the pipe drops due to the flow and discharge of fire-extinguishing water in the pipe, the pressure switch provided in the pressure air tank (not shown) operates to send a pump start signal to the pump control panel, and the pump is operated by the control panel. Then, the water is discharged and fire extinguisher.
[0025]
A second embodiment of the present invention will be described with reference to FIG.
The difference between this embodiment and the first embodiment is that, when supplying nitrogen gas to the secondary side pipe 2, a sub tank 40 filled with nitrogen gas is used in addition to the N ₂ gas generator 10. The sub tank 40 is connected to the N ₂ gas generator 10 through a regulator 41.
[0026]
In this embodiment, first, nitrogen gas in the sub-tank 40 is supplied to the secondary pipe 2, and then nitrogen gas is supplied from the N ₂ gas generator 10.
Since the N ₂ gas generation device 10 cannot generate a large amount of nitrogen gas rapidly, when the sub tank 40 is used first, the filling operation of the secondary side pipe 2 with the nitrogen gas can be performed in a short time.
Further, unlike the sub tank 40, the N ₂ gas generator 10 can continuously generate nitrogen gas for a long time, so that it can be replenished whenever the gas pressure in the secondary side pipe decreases.
[0027]
A third embodiment of the present invention will be described.
The difference between this embodiment and the first and second embodiments is that when nitrogen gas is sealed in the secondary side pipe 2, first, the air in the pipe is removed by evacuation, and then the nitrogen gas Is to supply. In addition to nitrogen gas, argon, neon, helium, or the like is used as the inert gas.
[0028]
【The invention's effect】
As described above, since the meniscus portion of the residual fire extinguishing liquid portion is covered with the inert gas, the present invention can prevent the generation of rust. Therefore, compared to the conventional example, the service life of the fire extinguishing equipment piping is extended and maintenance is also facilitated.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of the falling pipe of FIG.
FIG. 3 is an enlarged view of a main part of FIG. 2;
4 is an enlarged cross-sectional view of the horizontal tube of FIG.
5 is an enlarged cross-sectional view taken along line VV in FIG.
6 is an enlarged cross-sectional view of the L-shaped pipe of FIG.
FIG. 7 is a diagram showing a second embodiment of the present invention.
[Explanation of symbols]
1 Alarm valve 2 Secondary pipe 6 Falling pipe 10 N2 gas generator 30 Residual fire extinguishing liquid part M Meniscus part SP Closed sprinkler head

Claims (3)

A fire extinguishing facility that covers the meniscus portion of the residual fire extinguishing liquid portion generated in the piping of the fire extinguishing facility with nitrogen gas ;
After the water discharge test, the nitrogen gas is supplied to the residual fire extinguishing liquid part by a sub tank and a nitrogen gas generating device . First, nitrogen gas in the sub tank is supplied into the pipe, and then the nitrogen gas is supplied. While supplying nitrogen gas from the generator into the pipe,
The fire extinguishing equipment, wherein when the gas pressure in the pipe decreases , the gas in the pipe is supplemented with nitrogen gas generated by the nitrogen gas generator. The fire extinguishing equipment according to claim 1, wherein after the inside of the pipe is evacuated to remove air in the pipe, nitrogen gas in the sub tank is supplied into the pipe. The said residual fire extinguishing liquid part arises in the horizontal part of the L-shaped pipe which inclines with respect to a horizontal pipe, the bending part of a standing pipe, a horizontal pipe, or 2 The listed fire extinguishing equipment.

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