JP3689883B2 - Sprinkler fire extinguishing equipment - Google Patents

Description

[0001]
The present invention relates to a pre-actuated sprinkler fire extinguishing equipment.
[0002]
[Prior art]
In the wet pre-actuated sprinkler fire extinguishing equipment, the control valve is normally closed and the secondary side pipe is filled with fire extinguishing water. Therefore, when the control valve is opened by the fire detection of the fire detector and the closed sprinkler head is opened by heat, water discharge can be started immediately, so that quick fire extinguishing activities are possible.
On the other hand, however, if the sprinkler head malfunctions due to an external impact or the like, fire-fighting water in the secondary side pipe is discharged and water loss occurs.
[0003]
Therefore, in order to solve this problem, dry-type pre-actuated sprinkler fire extinguishing equipment is employed. Since this fire extinguishing equipment encloses pressurized gas such as air in the secondary side pipe, there is no risk of water loss even if the sprinkler head malfunctions.
[0004]
[Problems to be solved by the invention]
The conventional dry pre-actuated sprinkler fire extinguishing equipment has the following problems. (1) In the event of a fire, even if the sprinkler head operates, it takes time for the fire-extinguishing water to reach the head because the pressurized air is filled in the secondary pipe. Therefore, compared with a wet pre-acting sprinkler fire extinguishing equipment, the water discharge start time is greatly delayed, making initial fire fighting difficult.
(2) In dry-type pre-actuated fire extinguishing equipment, in order to cope with the delay in water discharge as described above, the diameter of the dry-type pipe must be made slightly larger than that of the wet type. For example, when the wet pipe diameter is 100 mm, the dry pipe diameter is approximately 125 to 150 mm, so that the dry type is more expensive.
[0005]
In view of the above circumstances, an object of the present invention is to prevent the occurrence of water loss and to enable quick water discharge.
[0006]
[Means for Solving the Problems]
The present invention relates to a secondary side pipe connected to a primary side pipe connected to a pump via a normally closed control valve, a closed sprinkler head connected to the secondary side pipe, and the same as the sprinkler head A sprinkler fire extinguishing facility comprising a fire detector disposed in a protective compartment, wherein the secondary side pipe is filled with pressurized gas; a bypass pipe connecting the primary side pipe and the secondary side pipe ; When the output signal of the fire detector reaches a pre-alarm level that is less dangerous than the fire level, the control valve is closed and the secondary side pipe is connected to the primary side via the bypass pipe. A preliminary water supply control means for supplying fire-extinguishing water in the pipe, and a valve control means for opening the control valve when a fire occurs and the output signal of the fire detector reaches a fire level;
The sprinkler fire extinguishing equipment is characterized in that fire-fighting water is immediately discharged when the sprinkler head is operated.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The inventor decided to solve the problems of the conventional example by combining the advantages of wet pre-actuated sprinkler piping and dry pre-actuated sprinkler piping.
That is, in the pre-actuation type, always keep the dry sprinkler piping state, and when the fire detector outputs a pre-alarm level that is less dangerous than the fire level, fill the secondary side pipe with the wet sprinkler piping state To.
[0008]
【Example】
An embodiment of the present invention will be described with reference to FIGS.
The primary side pipe 2 of the control valve, for example, the pressure release type alarm valve 1 is connected to a pump (not shown) through the water stop valve 3, and the secondary side pipe 5 thereof is a switching valve, for example, a five-way electric switching valve. 7 is connected to the exhaust pipe 8 through 7.
[0009]
The diameter of the secondary side pipe 5 is determined as the diameter of the wet sprinkler pipe. For example, 100A, that is, a diameter of 100 mm is adopted, and this pipe diameter is appropriately selected as necessary. The secondary side pipe 5 is provided with a plurality of closed sprinkler heads 10 for discharging water to the protection section.
[0010]
The five-way electric switching valve 7 is a combination of a three-way valve 7a and a valve 7b, and includes a primary side water supply port A, an air pressurization port B, a secondary side source port C, a secondary side terminal port D, and a drain exhaust. Port E is provided.
The primary side water supply port A is connected to a primary side pipe 2 between the alarm valve 1 and the water stop valve 3 via a bypass pipe 11. The bypass pipe 11 is connected to the control unit 1a of the alarm valve 1 through an electric start valve 13 and a manual start valve 15 arranged in parallel. The bypass pipe 11 preferably has a pipe diameter smaller than that of the alarm valve 1 or a flow rate is reduced by providing an orifice.
By doing so, it is possible to reduce water loss due to the sprinkler head 10 bursting after the output of the fire detector reaches the pre-alarm level.
[0011]
The air pressurization port B is connected to the air compressor 17 via the speed controller 16. The speed controller 16 includes two pressure switches having different operating pressures, and measures a decrease (decompression) time between the pressures. The primary source port C is connected to the secondary pipe 5 via the pressure switch 18.
[0012]
The secondary terminal port D is connected to the secondary pipe 5, and the drainage exhaust port E is connected to the exhaust pipe 8.
[0013]
A fire sensor 20 is disposed in the protection section of the sprinkler head 10, and the detection output of the fire sensor 20 is sent to a transmitter / receiver, for example, a control panel 22.
[0014]
Next, the operation of this embodiment is divided into (1) always (2) fire (3) non-fire (pre-alarm bell) (4) non-fire (fire level) (5) head breakage To do.
[0015]
(1) The constant fire detector 20 monitors the occurrence of a fire and outputs a detection result to the control panel 22 every certain time, for example, every 3 seconds. The control panel 22 determines whether the output signal obtained by reading the signal (S ₁ ) of the fire detector 20 is equal to or higher than the pre-alarm level (S ₂ ) and whether it is equal to or higher than the fire level (S ₄ ).
[0016]
The alarm valve 1 is closed, and a gas such as pressurized air or N ₂ is sealed in the secondary side pipe 5.
The water stop valve 3 of the primary side pipe 2 is opened, and the ports A, D, E of the five-way electric switching valve 7 are closed. That is, the valve 7b is closed, and the valve 7a is open so as to connect the air pressurization port B and the secondary side original port C.
When the pressure in the secondary side pipe 5 detected by the pressure switch 18 is lowered to a predetermined value, the air compressor 17 is activated and the pressure in the secondary side pipe 5 is reduced. Pressurized air is pumped until a predetermined value is reached.
Here, the above state is referred to as normal monitoring NS.
[0017]
(2) When a fire occurs in the event of a fire and the signal of the fire detector 20 exceeds the pre-alarm level, which is less dangerous than the fire level, the ports A and C, ports D and E are opened (S ₃ ) B is closed and the pressurized air in the secondary side pipe 5 is discharged to the exhaust pipe 8, and water for fire extinguishing in the primary side pipe 2 is supplied to the secondary side pipe 5 through the ports A and C. Reserve water.
[0018]
Further, when the fire detector 20 outputs a fire level or higher (S ₄ ), the control panel 22 opens the electric start valve 13 and closes the ports D and E.
Then, the alarm valve 1 the control unit 1a is operated is opened, the primary side pipe 2 and the secondary pipe 5 communicates (S _5).
The ports A and C are kept open, but may be closed.
In addition, a timer (not shown) may be provided so that the valve 7b is closed after a predetermined time after the alarm level is exceeded. Within this predetermined time, the secondary pipe 5 is filled with water.
[0019]
When the sprinkler head 10 is opened by heat and the head is operated (S ₆ ) (Y), fire-extinguishing water is immediately discharged from the head 10 toward the protection section (S ₇ ).
Fire extinguishing water in the primary side pipe 2 flows into the secondary side pipe 5 and is discharged from the sprinkler head 10, but this running water activates a running water alarm function that omits the illustration of the alarm valve 1, and the running water alarm is activated. Alert. When the head operation (S ₆ ) is not performed, the process returns to the normal monitoring NS.
[0020]
(3) Non-fire (pre-alarm level)
In determining whether or not the pre-alarm level is above (S ₂ ), it is determined that the level is above the level (Y), and when the level is below the level (N) (N), the ports A and C are connected (open). Whether or not (S ₁₀ ) is determined. In this case, the _three- way valve 7a is in A and C connection in S3.
[0021]
When the ports A and C are connected (Y), the timer is started (S11). This timer is set to a time sufficient to drain the fire-fighting water accumulated in the secondary side pipe 5. The ports B, C and D, E are opened (S ₁₂ ), air is supplied to the secondary side pipe, and drainage in the secondary side pipe 5 is started.
[0022]
When the time is up (S13) (Y), the valve 7b is closed to close the ports D and E, and the process returns to the normal monitoring NS.
[0023]
(4) Non-fire (fire level)
In the determination of whether it is above the fire level (S ₄ ), it is determined that it is above the fire level (Y), and then when it becomes below the level (N), is the pressure release type alarm valve 1 open? It is determined whether or not (S8).
[0024]
If the alarm valve 1 is open (Y), the alarm valve 1 is closed (S ₉ ), and then the routine returns to the normal monitoring NS.
In the determination of whether or not the alarm valve 1 is open (S ₈ ), if the alarm valve 1 is closed (N), the process returns to the normal monitoring NS.
[0025]
(5) When the pressure in the secondary side pipe 5 has decreased (S ₁₅ ) when the head is broken, if the pressure has decreased (Y), the speed controller will reduce the pressure to the allowable reference value. Sixteen timers are started. When the pressure decreases and reaches a limit value smaller than the allowable reference value, the timer stops, and the measurement time by the timer required to reach the limit value from the allowable reference value is output to the control panel 22. The timer automatically stops (time up) when a predetermined time elapses without the pressure reaching the limit value.
[0026]
When the time is up or the timer measurement time is longer than the reference time, it is recognized as an air leak in the secondary pipe 5, and it is shorter than the reference time, and the pressure drops in a very short time. In this case, it is recognized that the head is broken (S ₁₆ ).
When it is determined that there is an air leak, the compressor 17 is started to pressurize the secondary side pipe 5 to a predetermined pressure.
When it is recognized that the head is broken (S ₁₆ ), the ports D and E are opened (S ₁₇ ), and the pressurized air in the secondary side pipe 5 is quickly exhausted.
Here, the reason for rapid exhaust is that the pressure drop in the secondary side pipe may not cause breakage of the head. That is, the sprinkler head 10 may operate before the fire detector 20 operates, and in such a case, it is necessary to make it possible to respond immediately to a fire.
Then, on-site confirmation (S ₁₈ ) is performed, and if the head fails, the water stop valve 3 is closed and the head is replaced (S ₁₉ ).
[0027]
The embodiment of the present invention is not limited to the above. For example, instead of preliminarily supplying water into the secondary side pipe 5 via the five-way electric switching valve 7, the pressure release type alarm valve 1 is opened. Preliminary water supply may be performed, and then the alarm valve 1 may be closed.
Moreover, you may apply this invention to the normal sprinkler fire extinguishing equipment which is not a pre-operation type.
In addition, when the preliminary water supply to the secondary side pipe is performed through the bypass pipe 11 as in the present embodiment, the aram valve is not activated even if the sprinkler head is expelled after the output of the fire detector reaches the pre-alarm level. Since is closed, water loss can be reduced.
[0028]
【The invention's effect】
According to the present invention, when the fire detector reaches the pre-alarm level as described above, the secondary pipe is preliminarily supplied with water for the first time. Therefore, at this stage, the so-called dry to wet pre-actuated sprinkler fire extinguishing equipment is obtained. For this reason, when the closed sprinkler head is opened, water discharge is started immediately, so that early fire extinguishing is possible.
In addition, the present invention is in a wet state at the pre-alarm stage, and unlike the dry type, the water can be discharged immediately when the sprinkler head is operated, so that wet type piping can be used, so the dry type pre-acting sprinkler fire extinguishing equipment You can cost down.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of the present invention.
FIG. 2 is a detailed view of the five-way electric switching valve in FIG. 1;
FIG. 3 is a flowchart showing the operation of the sprinkler fire extinguishing equipment.
FIG. 4 is a flowchart showing the operation of the sprinkler fire extinguishing facility continued from FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pressure release type alarm valve 5 Secondary side piping 10 Closed type sprinkler head 20 Fire detector 22 Control panel

Claims (2)

A secondary side pipe connected to a primary side pipe connected to the pump via a normally closed control valve, a closed sprinkler head connected to the secondary side pipe, and the same sprinkler head as the sprinkler head. A sprinkler fire extinguishing facility comprising a fire detector installed and wherein the secondary pipe is filled with pressurized gas;
The bypass valve that connects the primary side pipe and the secondary side pipe, and the control valve is closed when the output signal of the fire detector reaches a pre-alarm level that is less dangerous than the fire level. In the secondary side pipe, when there is a fire and the fire detector output signal reaches the fire level, a preliminary water supply control means for supplying the fire water in the primary side pipe to the secondary side pipe via the bypass pipe Providing valve control means for opening the control valve;
The sprinkler fire extinguishing equipment is characterized in that water for fire extinguishing is immediately released when the sprinkler head is operated. A switching valve having a secondary terminal port connected to the secondary pipe and a drain exhaust port connected to the exhaust pipe;
When the output signal of the fire detector reaches a pre-alarm level that is less dangerous than the fire level, the preliminary water supply control means opens both ports and pressurizes the pressurized gas in the secondary pipe. the sprinkler fire extinguishing facility according to claim 1, wherein Rukoto is quick exhaust.

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