JP2013192583A - Sprinkler fire extinguishing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sprinkler fire extinguishing equipment for solving such a problem that a fire spreads while water discharge start is delayed since water is not discharged after a sprinkler head is operated until air inside secondary piping of an alarm valve is discharged in a fire, in dry type or pre-action type sprinkler fire extinguishing equipment.SOLUTION: Spreading of a fire is suppressed by pressurizing and filling a gaseous fire extinguisher of a nitrogen gas or the like into the secondary piping of an alarm valve at a monitoring pressure of 0.5 MPa or higher, and discharging the gaseous fire extinguisher at a pressure of 0.5 MPa or higher after a sprinkler head is operated until water discharge is started in a fire.

Description

  The present invention relates to a sprinkler fire extinguishing facility in which a secondary extinguishing pipe of an alarm valve is pressurized and filled with a gas fire extinguisher such as nitrogen gas.

In general sprinkler fire extinguishing equipment, water is pressurized and filled in the primary and secondary pipes of the alarm valve, and when the sprinkler head is activated, the alarm valve is opened and water discharge is started.
On the other hand, dry sprinkler fire extinguishing equipment is filled with compressed air in the secondary pipe of the alarm valve. This is because in general sprinkler fire extinguishing equipment, the water used in the piping may freeze, and the alarm valve is opened when the sprinkler head is activated and the water discharge starts. It has become.
The pre-actuated sprinkler fire extinguishing system is a facility that opens the alarm valve when both the fire detector and the sprinkler head are activated, and starts water discharge. It is reliable against damage caused by sprinkler head damage or malfunction. The equipment is high. In pre-actuated sprinkler fire extinguishing equipment, fill the secondary pipe connected to the secondary side of the alarm valve with compressed air, etc., and monitor the pressure to leak the secondary pipe, break the sprinkler head, etc. Check if there is any.

However, dry sprinkler fire extinguishing equipment and pre-actuated sprinkler fire extinguishing equipment have the following problems.
(1) When the sprinkler head is activated, water does not come out from the sprinkler head until the compressed air in the secondary side pipe is completely discharged, so that the start of water discharge may be delayed and the fire may spread.
(2) In order to reduce the influence of the delay in starting water discharge, the upper limit of the pipe capacity of the secondary side pipe is determined based on the alarm valve and the pipe diameter. For this reason, when considering use in actual equipment, the diameters of alarm valves and piping are increased, pumps with high pumping capacity are required, and equipment is expensive.
(3) In order to cope with the fire expansion due to the delay of the start of water discharge, the number of sprinkler heads simultaneously opened is set to be 1.5 times that of the wet sprinkler fire extinguishing equipment. For this reason, the amount of water source water increases, and the equipment becomes expensive.
(4) When a downward sprinkler head is used, the water that has passed through the pressure test remains in the falling pipe and cannot be discharged unless the sprinkler head is removed. It's easy to do.
In addition, when the pre-actuated sprinkler fire extinguishing equipment is filled with water, the pre-actuated sprinkler fire extinguishing equipment is filled with compressed air. The above-mentioned problems can be solved, but when the sprinkler head is damaged by external force, the water in the secondary side pipe is released. There is a possibility of effect.

Some pre-actuated sprinkler fire extinguishing equipment is filled with pressurized nitrogen gas in the secondary piping. When the secondary side pipe is filled with compressed air, the inner surface of the secondary side pipe is likely to corrode due to the influence of moisture and compressed air, and therefore, corrosion is prevented by filling with nitrogen gas under pressure.
Nitrogen gas is also used in fire extinguishing equipment as an inert gas fire extinguisher, but in pre-actuated sprinkler fire extinguishing equipment, the pressure in the secondary side pipe is about 0.1 to 0.2 MPa, and a sprinkler head is installed. Nitrogen gas does not reach from the ceiling to the floor fire and does not function as a fire extinguisher. In the event of a fire, it will not be possible to discharge the nitrogen gas until it has been released, causing a delay in water discharge.
JP-A-6-86837

  The present invention has been made to solve such a problem, and a pre-acting sprinkler fire extinguishing equipment that fills the secondary side with air and a sprinkler fire extinguishing equipment that solves problems such as a delay in water discharge that the dry sprinkler fire extinguishing equipment has. The purpose is to provide.

The sprinkler fire extinguishing equipment according to the present invention includes a secondary side pipe connected to a secondary side of an alarm valve, and a closed head connected to the secondary side pipe, and the alarm valve is the secondary side A sprinkler fire extinguishing facility that is opened due to a pressure drop in the piping, and is characterized in that, during monitoring, the secondary side piping is pressurized and filled with a fire extinguishing agent at a monitoring pressure of 0.5 MPa or more.

Further, the sprinkler fire extinguishing equipment according to the present invention transmits a fire signal upon detecting a fire, a secondary side pipe connected to the secondary side of the alarm valve, a closed head connected to the secondary side pipe, and A sprinkler fire extinguishing equipment that is opened by the fire signal of the fire sensor, and when monitoring, the fire extinguishing agent is monitored at 0.5 MPa or more in the secondary side pipe. It is characterized by being pressurized and filled with pressure.

Further, the sprinkler fire extinguishing equipment according to the present invention includes a secondary side pipe connected to the secondary side of the alarm valve, a closed head connected to the secondary side pipe, and a pressure in the secondary side pipe. A pressure switch that transmits a pressure drop signal when the pressure is reduced to a predetermined pressure, and a sprinkler fire extinguishing facility in which the alarm valve is opened by the pressure drop signal of the pressure switch. The pipe is pressurized and filled with a fire extinguishing agent at a monitoring pressure of 0.5 MPa or more, and the operating pressure of the pressure switch is 0.5 MPa or more and less than the monitoring pressure.

Further, the sprinkler fire extinguishing equipment according to the present invention transmits a fire signal upon detecting a fire, a secondary side pipe connected to the secondary side of the alarm valve, a closed head connected to the secondary side pipe, and And a pressure switch that transmits a pressure drop signal when the pressure in the secondary side pipe drops to a predetermined pressure, and the alarm valve includes the fire signal of the fire detector and the pressure sensor. The sprinkler fire extinguishing equipment is opened by the pressure drop signal of the pressure switch, and when monitoring, the secondary side pipe is pressurized and filled with a fire extinguishing agent at a monitoring pressure of 0.5 MPa or more, and the operating pressure of the pressure switch is set. The pressure is 0.5 MPa or more and less than the monitoring pressure.

In the present invention, when the sprinkler head is opened, the gas fire extinguisher that is pressurized and filled in the secondary pipe connected to the secondary side of the alarm valve can be released at a pressure of 0.5 MPa or more. Therefore, the following effects can be achieved.
(1) Since the gas fire extinguishing agent is released at a relatively high pressure of 0.5 MPa or more, when the sprinkler head is operated, a large amount of fire extinguishing gas can be released to suppress a fire. The fire extinguishing gas suppresses the spread of the fire until the alarm valve opens and discharges water, so the fire extinguishing effect equivalent to general sprinkler fire extinguishing equipment is obtained without being affected by the delay in the start of water discharge. It is done. Therefore, even if the alarm valve and the pipe diameter, the size of the pump, and the number of sprinkler heads simultaneously opened are the same as those of a general sprinkler fire extinguishing equipment, an equivalent fire extinguishing effect can be obtained. This also makes it easier than ever to change the pipe diameter, etc. when changing a property with a general sprinkler fire extinguishing facility to a pre-actuated sprinkler fire extinguishing facility or a dry sprinkler fire extinguishing facility at the time of renovation. Can be changed.
(2) When used in dry sprinkler fire extinguishing equipment, set the alarm pressure used for general sprinkler fire extinguishing equipment by making the monitoring pressure on the secondary side higher than the monitoring pressure on the primary side. It can be used as it is.
(3) Since the secondary side pipe is pressure-filled with a fire extinguishing agent, the oxygen concentration in the secondary side pipe can be lowered, and the inner surface of the secondary side pipe is less likely to corrode.

It is explanatory drawing of the sprinkler fire extinguishing equipment which concerns on Embodiment 1 of this invention. It is explanatory drawing of the sprinkler fire extinguishing equipment which concerns on Embodiment 2 of this invention.

Embodiment 1
FIG. 1 is an explanatory diagram of a sprinkler fire extinguishing facility according to Embodiment 1 of the present invention.
The sprinkler fire extinguishing equipment according to the first embodiment includes an alarm valve 20, a secondary side pipe 2 connected to the secondary side of the alarm valve 20, and a primary side pipe 7 connected to the primary side of the alarm valve 20. It has. The secondary side pipe 2 is provided with a sprinkler head 3 that is a closed type head, and a terminal test valve (not shown) is provided at the end of the secondary side pipe 2. Further, the primary side pipe 7 is provided with a pump 8, a pressure air tank 9, and the like. The pressure air tank 9 monitors the pressure in the pressure air tank 9 (that is, in the primary side pipe 7). A switch 10 is provided. The pump activation pressure switch 10 transmits a primary pressure lowering signal to the pump control panel 11 when the pressure in the pressure air tank 9 becomes a predetermined pressure or less. The pump control panel 11 that has received the primary pressure reduction signal transmits a pump activation signal to the pump 8 to activate the pump 8.
When the pump 8 is activated, it draws water from the fire-extinguishing water tank 17 and supplies it under pressure to the primary pipe 7.

  The secondary pipe 2 is pressurized and filled with nitrogen gas (an example of an inert gas) as a gas fire extinguisher, and the nitrogen gas passes from the nitrogen gas generator 14 through the nitrogen gas filling pipe 15 to the secondary side. It is introduced into the pipe 2. A check valve 16 is provided in the nitrogen gas filling pipe 15 so that the nitrogen gas flows only in the direction toward the secondary side pipe 2 and prevents the secondary side pipe 2 from flowing into the nitrogen gas filling pipe 15. .

Nitrogen is the most abundant gas in the air, and the nitrogen gas generator 14 takes in air, removes unnecessary things such as oxygen and carbon dioxide, and collects nitrogen.
Nitrogen gas is also used as an inert gas fire extinguisher and can extinguish a fire by the suffocation effect.

  The alarm valve 20 has a check valve structure in which a valve body (not shown) is opened only when the pressure on the primary side is higher than the pressure on the secondary side. The alarm valve 20 has a communication pipe 22 that is closed when the valve body is closed and communicates when the valve body is opened, and the communication pipe 22 is provided with a valve opening monitoring pressure switch 21. The valve opening monitoring pressure switch 21 is electrically connected to the fire receiver 12, and when the valve body of the alarm valve 20 is opened, a part of the pressurized water flowing from the primary side flows into the communication pipe 22 and enters the valve. The open monitoring pressure switch 21 is activated to transmit a valve opening signal to the fire receiver 12. The fire receiver 12 displays on the panel that the alarm valve 20 has been opened, or rings the bell 19.

The operation of the present embodiment configured as described above will be described separately for monitoring and fire.
<When monitoring>
At the time of monitoring, the alarm valve 20 is closed, and the secondary pipe 2 is filled with nitrogen gas at a predetermined pressure (for example, 0.7 MPa).
At the time of monitoring, the primary side pipe 7 is filled with water pressurized to a predetermined pressure (eg, 0.65 MPa) lower than the pressure of the nitrogen gas.
Since monitoring takes a long period of time, there is a concern that nitrogen gas leaks out from the screwed portion of the secondary pipe 2 or the like, but the nitrogen gas corresponding to the leakage is replenished from the nitrogen gas generator 14. The amount of nitrogen gas charged into the secondary pipe 2 from the nitrogen gas generator 14 is set to be smaller than the amount discharged from the sprinkler head 3.

<In case of fire>
When a fire occurs, the sprinkler head 3 operates and the nitrogen gas filled in the secondary side pipe 2 is released. While the released nitrogen gas suppresses the fire, the pressure in the secondary side pipe 2 decreases and becomes lower than the pressure in the primary side pipe 7, the alarm valve 20 is opened, and the valve opening signal is sent to the fire receiver 12. Sent to.

  When the fire receiver 12 receives the valve opening signal, it displays that the alarm valve 20 has been opened on the panel surface and rings the bell 19.

  When the alarm valve 20 is opened, the water in the primary side pipe 7 flows into the secondary side pipe 2. At this time, when the pressure in the primary side pipe 7 decreases and the pressure in the pressure air tank 9 decreases following this, and reaches a predetermined pressure (for example, 0.55 MPa), the pump start pressure switch 10 decreases the primary pressure. A signal is transmitted to the pump control panel 11. The pump control panel 11 that has received the primary pressure reduction signal transmits a pump activation signal to the pump 8 and the pump 8 is activated.

  When the pump 8 is started, the water pumped from the fire-extinguishing water tank 17 is sent to the sprinkler head 3 through the primary side pipe 7, the alarm valve 20, and the secondary side pipe 2, and the nitrogen filled in the secondary side pipe 2. Water is discharged from the sprinkler head 3 following the gas.

  Until the water is discharged from the sprinkler head 3, since the nitrogen gas is released from the sprinkler head 3 at a pressure of 0.5 MPa or more, the expansion of the fire is suppressed, without being affected by the delay in starting the water discharge, Since a fire extinguishing effect equivalent to a general sprinkler fire extinguishing equipment can be obtained, there is no problem of water discharge delay.

As described above, the sprinkler fire extinguishing equipment used in the first embodiment includes the secondary side pipe 2 connected to the secondary side of the alarm valve 20 and the sprinkler head 3 connected to the secondary side pipe 2. And a sprinkler fire extinguishing facility in which the alarm valve 20 is opened due to a pressure drop in the secondary side pipe 2. When monitoring, a gas fire extinguishing agent (for example, nitrogen gas) is 0.5 MPa or more in the secondary side pipe 2. Under pressure (for example, 0.7 MPa).
With the above configuration, when the sprinkler head 3 is operated, the fire extinguishing agent suppresses the expansion of the fire until the alarm valve 20 is opened and the water is discharged, so that it is not affected by the delay of the water discharge start. Since a fire extinguishing effect equivalent to that of a general sprinkler fire extinguishing equipment can be obtained, the alarm valve and pipe diameter, the size of the pump, and the number of sprinkler heads simultaneously opened can be made the same as those of a general sprinkler fire extinguishing equipment. In addition, this makes it easier than ever to change the pipe diameter and the like when changing a property in which a general sprinkler fire extinguishing facility is constructed to a dry sprinkler fire extinguishing facility at the time of renewal.
When used in dry sprinkler fire extinguishing equipment, the monitoring pressure on the secondary side is made higher than the monitoring pressure on the primary side so that the alarm valve used for general sprinkler fire extinguishing equipment (check valve structure alarm valve) remains unchanged. Can be used.
Moreover, since the secondary side pipe is pressure-filled with the fire extinguishing agent, the oxygen concentration in the secondary side pipe can be lowered, and the inner surface of the secondary side pipe is hardly corroded.

  In the first embodiment, the pressure in the secondary pipe 2 at the time of monitoring is 0.7 MPa, but any pressure that can be released at a pressure of 0.5 MPa or more is acceptable.

Embodiment 2
FIG. 2 is an explanatory diagram of a sprinkler fire extinguishing facility according to Embodiment 2 of the present invention. In the second embodiment, the pre-actuated alarm valve 1 is applied instead of the alarm valve 20 of the first embodiment, and the same parts as those in the first embodiment have the same numbers.
Further, the following points are different from the first embodiment.
The sprinkler fire extinguishing equipment according to the second embodiment uses a pre-actuated alarm valve 1 instead of the alarm valve 20.
The pre-actuated alarm valve 1 is provided with a motor operated valve 5 that activates the pre-actuated alarm valve 1 and a secondary pressure monitoring pressure switch 6 that monitors the pressure in the secondary pipe 2.

In addition, a fire extinguishing equipment control panel 13 for controlling the pre-acting alarm valve 1 is provided, and the motor-operated valve 5 of the pre-acting alarm valve 1, the pressure switch 6 for monitoring the secondary pressure, and a limit switch described later are electrically connected. It is connected.
Moreover, the fire extinguishing equipment control panel 13 is electrically connected to the fire receiver 12 and exchanges signals with each other.

  A fire detector 4 is installed in the monitoring area monitored by the sprinkler head 3, and a fire signal from the fire detector 4 is transmitted to the fire extinguishing equipment control panel 13 via the fire receiver 12. Fire detectors are usually used that operate by detecting fire smoke, heat, etc., and generally operate faster than sprinkler heads in the event of a fire.

  The pre-acting alarm valve 1 is provided with a piston chamber (not shown), and the piston (not shown) moves when the water pressure in the piston chamber changes, and the primary side and the secondary side are closed or communicated. To do. As a mechanism for changing the water pressure in the piston chamber, a water-filling pipe (not shown) for filling the piston chamber with water from the primary side pipe 7 and a drain pipe 18 for draining the water in the piston chamber are provided. The motorized valve 5 is connected. The filling pipe is provided with an orifice (not shown), and is set so that the amount of water filled from the filling pipe is smaller than the water drained from the drain pipe 18. When the motor-operated valve 5 is opened, water is drained from the drain pipe 18 and more water is drained than the water that is filled from the fill pipe, so that the water pressure in the piston chamber decreases, the pre-actuated alarm valve 1 opens, and the primary Side and secondary side communicate.

  The pre-actuated alarm valve 1 is provided with a secondary pressure drop monitoring pressure switch 6 for monitoring the pressure in the secondary side pipe 2, and the pressure in the secondary side pipe 2 is below a predetermined pressure. Then, the secondary pressure drop monitoring pressure switch 6 is actuated to transmit a pressure drop signal to the fire extinguishing equipment control panel 13.

  Further, the pre-acting alarm valve 1 is provided with a limit switch (not shown) for detecting that the pre-acting alarm valve 1 is opened, and an operation signal of the limit switch is transmitted to the fire extinguishing equipment control panel 13. The

  When the fire extinguishing equipment control panel 13 receives both the fire signal from the fire detector and the pressure drop signal from the secondary pressure drop monitoring pressure switch 6, it sends an open signal to the motor-operated valve 5.

  In the second embodiment, since the pre-actuated alarm valve is opened by the operation of the fire sensor 4 and the operation of the pressure switch 6 for monitoring the secondary pressure drop, the system is started, so the secondary pressure is the primary pressure during monitoring. The pressure may be lower as long as the pressure can release nitrogen gas at a pressure of 0.5 MPa or more. This makes it easy to set the pressure of the entire facility.

The operation of the present embodiment configured as described above will be described separately for monitoring, fire, and malfunction.
<When monitoring>
At the time of monitoring, the motor-operated valve 5 is closed, the piston chamber of the pre-acting alarm valve 1 is filled with fire-extinguishing water in the primary side pipe 5 through the orifice, and the pre-acting alarm valve 1 is closed. It has become. The secondary pipe 2 is filled with nitrogen gas at a predetermined pressure (for example, 0.7 MPa). Since the secondary side pipe is filled with a fire extinguishing agent under pressure, the oxygen concentration in the secondary side pipe can be lowered and the inner surface of the secondary side pipe is less likely to corrode.
Since monitoring takes a long period of time, there is a concern that nitrogen gas may leak out from the screwed portion of the secondary side pipe 2. However, the nitrogen gas is leaked through the nitrogen gas filling pipe 15. 14 is replenished. The amount of nitrogen gas charged into the secondary pipe 2 from the nitrogen gas generator 14 is set to be smaller than the amount discharged from the sprinkler head 3.

<In case of fire>
When a fire occurs, the fire detector 4 is activated and a fire signal is transmitted to the fire extinguishing equipment control panel 13 via the fire receiver 12. At this time, the fire receiver 12 displays on the panel that the fire detector 4 has been activated, or rings the bell 19.
Next, when the sprinkler head 3 is operated, the nitrogen gas filled in the secondary side pipe 2 is released. While the released nitrogen gas suppresses the fire, the pressure in the secondary side pipe 2 drops, and when the pressure falls below a predetermined pressure (for example, 0.6 MPa), the secondary pressure drop monitoring pressure switch 6 is activated, A pressure drop signal is input to the fire extinguishing equipment control panel 13.

  The fire extinguishing equipment control panel 13 transmits an open signal to the motor-operated valve 5 when both a fire signal and a pressure drop signal are input.

  When the motor-operated valve 5 that has received the opening signal is opened, the water in the piston chamber of the pre-acting alarm valve 1 is discharged, the pressure in the piston chamber is reduced, and the pre-acting alarm valve 1 is opened. The opening of the pre-actuated alarm valve 1 is detected by a limit switch, and the operation of the pre-actuated alarm valve 1 can be confirmed, that is, the presence or absence of water discharge can be confirmed. The limit switch transmits an opening signal of the pre-actuated alarm valve 1 to the fire receiver 12 via the fire extinguishing equipment control panel 13. The fire receiver 12 displays on the panel surface that the pre-actuated alarm valve 1 has been opened.

  When the pre-acting alarm valve 1 is opened, water in the primary side pipe 7 flows into the secondary side pipe 2. At this time, when the pressure in the primary side pipe 7 decreases, and the pressure in the pressure air tank 9 decreases to a predetermined pressure (for example, 0.5 MPa) following this, the pump activation pressure switch 10 is switched to the primary pressure. A lowering signal is transmitted to the pump control panel 11. The pump control panel 11 that has received the primary pressure reduction signal transmits a pump activation signal to the pump 8 and the pump 8 is activated.

  When the pump 8 is activated, water pumped from the fire extinguishing water tank 17 is discharged from the sprinkler head 3 through the primary side pipe 7, the pre-actuated alarm valve 1, and the secondary side pipe 2.

  Until the water is discharged from the sprinkler head 3, since the nitrogen gas is released from the sprinkler head 3 at a pressure of 0.5 MPa or more, the expansion of the fire is suppressed, without being affected by the delay in starting the water discharge, Since a fire extinguishing effect equivalent to a general sprinkler fire extinguishing equipment can be obtained, there is no problem of water discharge delay.

<In case of malfunction>
In the case of this embodiment, even if either the sprinkler head 3 or the fire detector 4 is activated due to a factor other than a fire, such as when the sprinkler head 3 is released due to a physical shock, the pre-operation type Since the alarm valve 1 does not open, water loss does not occur.

As described above, the sprinkler fire extinguishing equipment used in the second embodiment includes the secondary side pipe 2 connected to the secondary side of the pre-acting alarm valve 1 and the sprinkler head connected to the secondary side pipe 2. 3 and a pressure switch 6 for monitoring a secondary pressure drop that transmits a pressure drop signal when the pressure in the secondary side pipe 2 falls below a predetermined pressure, and a fire detector 4 that sends a fire signal when a fire is detected, The pre-actuated alarm valve 1 is a sprinkler fire extinguishing facility that is opened by the pressure drop signal of the secondary pressure drop monitoring pressure switch 6 and the fire signal of the fire detector 4. A fire extinguisher (for example, nitrogen gas) is pressurized and filled at a monitoring pressure of 0.5 MPa or more (for example, 0.7 MPa), and the operating pressure of the pressure switch 6 for monitoring the secondary pressure drop is 0.5 MPa or more, It is as follows.
From the above configuration, the operation of the sprinkler head 3 causes the pre-actuated alarm valve 1 to open and release the water, so that nitrogen gas suppresses the spread of the fire. Therefore, a fire extinguishing effect equivalent to that of a general sprinkler fire extinguishing equipment can be obtained, so that the alarm valve, the pipe diameter, the size of the pump, and the number of sprinkler heads simultaneously opened can be made the same as the general sprinkler fire extinguishing equipment. In addition, this makes it easier than ever to change the pipe diameter or the like when changing a property in which a general sprinkler fire extinguishing facility is constructed to a pre-operated sprinkler fire extinguishing facility at the time of renewal.
Moreover, since the secondary side pipe is pressure-filled with the fire extinguishing agent, the oxygen concentration in the secondary side pipe can be lowered, and the inner surface of the secondary side pipe is hardly corroded.

  In the second embodiment, the pressure in the secondary pipe 2 at the time of monitoring is 0.7 MPa, but any pressure that can be released at a pressure of 0.5 MPa or more is acceptable.

Embodiment 3
The third embodiment is the same as the second embodiment except that the fire extinguishing equipment control panel 13 is changed to a fire extinguishing equipment control board 131 (not shown), and only the fire detector 4 is activated for pre-operation. The type alarm valve 1 is open. The points different from the second embodiment at the time of fire and malfunction are described below.

  In the third embodiment, since the pre-actuated alarm valve is opened by the operation of the fire detector 4 and the system is started, the secondary pressure may be lower than the primary pressure during monitoring, and the pressure is 0.5 MPa or more. The pressure may be any pressure at which nitrogen gas can be released. This makes it easy to set the pressure of the entire facility.

<In case of fire>
When a fire occurs, the fire detector 4 is activated and a fire signal is transmitted to the fire extinguishing equipment control panel 131 via the fire receiver 12. The fire extinguishing equipment control panel 131 transmits an open signal to the motor-operated valve 5 when receiving a fire signal. Upon receipt of the opening signal, the motor-operated valve 5 is opened, and the pre-actuated alarm valve 1 is opened. When the pre-acting alarm valve 1 is opened, the water in the primary side pipe 7 flows into the secondary side pipe 2, but the secondary side pipe 2 is pressurized and filled with nitrogen, so the amount is small. . For this reason, the pressure in the primary side pipe 7 does not drop to the set value of the pump activation pressure switch 10.

  Subsequently, when the sprinkler head 3 is operated, nitrogen gas is released from the sprinkler head 3 to suppress a fire. When the nitrogen gas is released, the pre-actuated alarm valve 1 is opened, so that when the pressure in the primary side pipe 7 decreases and reaches the set pressure of the pump activation pressure switch 10, the pump activation pressure switch 10 is primary. A pressure drop signal is transmitted to the pump control panel 11, and the pump control panel 11 activates the pump 8.

  When the pump 8 is activated, water pumped from the fire extinguishing water tank 17 is discharged from the sprinkler head 3 through the primary side pipe 7, the pre-actuated alarm valve 1, and the secondary side pipe 2.

  Until the water is discharged from the sprinkler head 3, since the nitrogen gas is released from the sprinkler head 3 at a pressure of 0.5 MPa or more, the expansion of the fire is suppressed, without being affected by the delay in starting the water discharge, Since a fire extinguishing effect equivalent to a general sprinkler fire extinguishing equipment can be obtained, there is no problem of water discharge delay.

<In case of malfunction>
When the sprinkler head 3 is opened due to a physical impact or the like, the fire detector 4 is not activated, so the pre-actuated alarm valve 1 is closed and water is not discharged and water loss occurs. do not do.
When the fire detector 4 malfunctions, the pre-actuated alarm valve 1 opens, but if the sprinkler head 3 does not operate, water is not discharged and no water loss occurs.

As described above, the sprinkler fire extinguishing equipment used in the third embodiment includes the secondary side pipe 2 connected to the secondary side of the pre-acting alarm valve 1 and the sprinkler head connected to the secondary side pipe 2. 3 and a fire detector 4 that transmits a fire signal when a fire is detected, and a sprinkler fire extinguishing system in which the alarm valve 1 is opened by the fire signal of the fire detector 4. A gas fire extinguisher (for example, nitrogen gas) is pressurized and filled at a monitoring pressure of 0.5 MPa or more (for example, 0.7 MPa).
With the above configuration, when the sprinkler head 3 is activated, the pre-actuated alarm valve 1 is already open, and the nitrogen gas suppresses the expansion of the fire until the water is released. Therefore, the same fire extinguishing effect as a general sprinkler fire extinguishing system can be obtained, so the alarm valve and pipe diameter, pump size, and the number of sprinkler heads that can be opened simultaneously are the same as the general sprinkler fire extinguishing system. Can be. In addition, this facilitates the change of the pipe diameter and the like when changing a property in which a general sprinkler fire extinguishing facility is constructed to a pre-operated sprinkler fire extinguishing facility at the time of renewal.
Moreover, since the secondary side pipe is pressure-filled with the fire extinguishing agent, the oxygen concentration in the secondary side pipe can be lowered, and the inner surface of the secondary side pipe is hardly corroded.

  In the third embodiment, the pressure in the secondary pipe 2 at the time of monitoring is 0.7 MPa, but any pressure that can be released at a pressure of 0.5 MPa or more is acceptable.

Embodiment 4
The fourth embodiment is different from the second embodiment in that the pre-actuated alarm valve 1 is opened regardless of the operation of the fire sensor 4 and the pressure switch for monitoring the secondary pressure drop due to the pressure drop in the secondary pipe 2. The fire extinguishing equipment control panel 13 is changed to a fire extinguishing equipment control panel 132 (not shown).

  The point that the system is started by the operation of the sprinkler head 3 is the same as that of the first embodiment. However, when the first embodiment is monitored, the secondary side pressure needs to be higher than the primary side pressure. Sometimes, the secondary side pressure may be lower than the primary side pressure, and any pressure can be used as long as nitrogen gas can be released at a pressure of 0.5 MPa or more. This makes it easy to set the pressure of the entire facility.

As described above, the sprinkler fire extinguishing equipment used in the fourth embodiment includes the secondary side pipe 2 connected to the secondary side of the pre-acting alarm valve 1 and the sprinkler head connected to the secondary side pipe 2. 3 and a pressure switch 6 for monitoring a secondary pressure drop that transmits a pressure drop signal when the pressure in the secondary pipe 2 becomes a predetermined pressure or lower, and the pre-acting alarm valve 1 is a pressure of the secondary pipe 2 A sprinkler fire extinguishing facility that is opened by a drop, and during monitoring, a gas-based fire extinguishing agent (for example, nitrogen gas) is pressurized and filled in the secondary side pipe 2 with a monitoring pressure (for example, 0.7 MPa) of 0.5 MPa or more. The operating pressure of the secondary pressure drop monitoring pressure switch 6 is 0.5 MPa or more and less than the monitoring pressure.
With the above configuration, when the sprinkler head 3 is activated, the fire extinguishing agent suppresses the expansion of the fire until the pre-actuated alarm valve 1 opens and discharges water. Therefore, a fire extinguishing effect equivalent to that of a general sprinkler fire extinguishing equipment can be obtained, so that the alarm valve, the pipe diameter, the size of the pump, and the number of sprinkler heads simultaneously opened can be made the same as the general sprinkler fire extinguishing equipment. In addition, this makes it easier than ever to change the pipe diameter and the like when changing a property with a general sprinkler fire extinguishing facility to a dry sprinkler fire extinguishing facility at the time of renewal.
Moreover, since the secondary side pipe is pressure-filled with the fire extinguishing agent, the oxygen concentration in the secondary side pipe can be lowered, and the inner surface of the secondary side pipe is hardly corroded.

  In addition, in this Embodiment 4, although the pressure in the secondary side piping 2 at the time of monitoring is 0.7 MPa, what is necessary is just the pressure which can be discharge | released by the pressure of 0.5 MPa or more.

  In Embodiments 1 to 4, an example of a method using nitrogen gas as a fire extinguisher has been shown, but the fire extinguisher is not limited to nitrogen, and may be other inert gas or halide fire extinguishing agent, For example, a fire extinguisher composed of dodecafluoro-2-methylpentan-3-one may be used. In this case, instead of the nitrogen gas generator 14, a fire extinguisher storage container is provided to store the fire extinguisher.

1 Pre-acting alarm valve, 2 Secondary side piping, 3 Sprinkler head, 4 Fire detector, 5 Motorized valve, 6 Secondary pressure drop monitoring pressure switch, 7 Primary side piping, 8 Pump, 9 Pressure air tank, 10 Pressure switch for pump activation, 11 Pump control panel, 12 Fire receiver, 13 Fire extinguishing equipment control panel, 14 Nitrogen gas generator, 15 Nitrogen gas filling pipe, 16 Check valve, 17 Fire fighting water tank, 18 Drain pipe, 19 bell, 20 alarm valve, 21 pressure switch for valve opening monitoring, 22 communication pipe, 131, 132 fire extinguishing equipment control panel

Claims (6)

A secondary pipe connected to the secondary side of the alarm valve;
A closed head connected to the secondary pipe,
The sprinkler fire extinguishing equipment, wherein the alarm valve opens due to a pressure drop in the secondary pipe,
The sprinkler fire extinguishing equipment, wherein the secondary side pipe is filled with a fire extinguishing agent at a monitoring pressure of 0.5 MPa or more during monitoring.
A secondary pipe connected to the secondary side of the alarm valve;
A closed head connected to the secondary pipe;
A fire detector for detecting a fire and transmitting a fire signal,
The sprinkler fire extinguishing equipment, wherein the alarm valve is opened by the fire signal of the fire detector,
The sprinkler fire extinguishing equipment, wherein the secondary side pipe is filled with a fire extinguishing agent at a monitoring pressure of 0.5 MPa or more during monitoring.
A secondary pipe connected to the secondary side of the alarm valve;
A closed head connected to the secondary pipe;
A pressure switch for transmitting a pressure drop signal when the pressure in the secondary side pipe drops to a predetermined pressure, and
The sprinkler fire extinguishing equipment, wherein the alarm valve is opened by the pressure drop signal of the pressure switch,
During monitoring, the secondary pipe is pressurized and filled with a fire extinguisher at a monitoring pressure of 0.5 MPa or more, and the operating pressure of the pressure switch is 0.5 MPa or more and less than the monitoring pressure. Sprinkler fire extinguishing equipment
A secondary pipe connected to the secondary side of the alarm valve;
A closed head connected to the secondary pipe;
A fire detector that detects fire and sends a fire signal;
A pressure switch for transmitting a pressure drop signal when the pressure in the secondary side pipe drops to a predetermined pressure, and
The sprinkler fire extinguishing equipment, wherein the alarm valve is opened by the fire signal of the fire detector and the pressure drop signal of the pressure switch,
During monitoring, the secondary pipe is pressurized and filled with a fire extinguisher at a monitoring pressure of 0.5 MPa or more, and the operating pressure of the pressure switch is 0.5 MPa or more and less than the monitoring pressure. Sprinkler fire extinguishing equipment
The sprinkler fire extinguishing equipment according to claim 1, wherein the fire extinguishing agent is an inert gas.
The sprinkler fire extinguishing equipment according to any one of claims 1 to 4, wherein the fire extinguishing agent is made of ether having 3 or more carbon atoms and fluorine substitution.

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