JP2006288804A - Fire-extinguishing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain fire-extinguishing equipment which can reduce the damage of a water loss. <P>SOLUTION: The fire extinguishing facility has a signal generation section 15 which outputs an on/off signal and a fire-extinguishing head 13 to intermittently throw water on the basis of the on/off signal. With the elapse of time from the time when water throwing is started, the equipment varies the pulse width, the pulse interval or the pulse height of the on/off signal so as to reduce the quantity of water thrown. A fire sensor 18 is provided in a protection area in which the fire-extinguishing head 13 is provided so as to switch between the on condition and the off condition of the signal on the basis of the sensor output of the fire sensor 18. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to fire extinguishing equipment.

Conventionally, fire extinguishing equipment such as a sprinkler fire extinguishing equipment extinguishes a fire by continuously emitting water without interruption when the sprinkler head is opened. For such continuous radiation, there is a fire extinguishing facility that discharges water intermittently or in a pulsating manner, as in Patent Document 1. In the fire extinguishing facility of Patent Document 1, an electric valve is connected to the nozzle, and the electric valve is periodically opened and closed to discharge water from the nozzle in a pulsating manner.
Japanese Patent Laid-Open No. 9-182812

  In this fire extinguishing equipment, the maximum radiation amount is increased to obtain a higher fire extinguishing capability by pulsating water, and the damage of water loss is reduced. However, the amount of water discharged from the head in the event of a fire does not change from when the head is opened due to a fire to when the fire is extinguished, and even when the fire has been extinguished, the same amount of water is discharged as when the fire occurred. There was room for improvement. Then, an object of this invention is to obtain the fire extinguishing equipment which can reduce damage of water loss more.

The present invention has been made to solve the above problems, and in a fire extinguishing facility including a signal generation unit that outputs an on / off signal and a fire extinguishing head that intermittently discharges water based on the on / off signal, As the time elapses, the pulse width, pulse interval, or pulse height of the on / off signal is changed so as to reduce the water discharge amount. In addition, a fire detector is installed in the protective area where the fire extinguishing head is installed,
Based on the sensor output of the fire detector, the on / off signal state is switched and controlled.

  The present invention relates to a fire extinguishing facility including a signal generator that outputs an on / off signal and a fire extinguishing head that intermittently discharges water based on the on / off signal, and reduces the pulse width of the on / off signal as time passes. Or increasing the pulse interval or decreasing the pulse height. For this reason, the fire scale decreases with the passage of time from the start of water discharge, and the amount of water discharged from the fire extinguishing head also decreases accordingly, so there is no unnecessary water discharge and less damage to water damage. can do.

  In addition, a fire detector is installed in the protection area where the fire extinguishing head is installed, and the ON / OFF signal state is switched and controlled based on the sensor output of the fire detector. Can be adjusted.

  FIG. 1 is a system block diagram for explaining the fire extinguishing equipment of the present invention. 11 is a fire-extinguishing pipe filled with fire-extinguishing water, and a pressurized water supply device including a pump and a water tank is provided on the base end side. A rising pipe is branched from the fire extinguishing pipe 11, and an open-type fire extinguishing head 13 is connected to the falling pipe via an on-off valve 12 including an electric valve. The on-off valve 12 is normally closed and is opened and closed based on an on / off signal from a signal generation unit 15 described later, whereby the fire-extinguishing head 13 is configured to intermittently discharge water.

  A signal generator 15 outputs a valve opening / closing signal composed of an on / off signal to the opening / closing valve 12. The signal generator 15 is connected to the fire receiver 16 and the fire extinguishing control panel 17 via signal lines. In addition, a fire detector 18 is connected to the fire receiver 16 via a signal line, and a water flow detector and a pump (or pump control panel) (not shown) are connected to the fire extinguishing control panel 17 via a signal line. Yes. The fire detector 18 is provided in the same protection area as the fire extinguishing head 13.

  The signal generator 15 outputs an on / off signal in the event of a fire. For example, when the fire detector 18 detects a fire, or when a running water detection device (not shown) outputs a running water signal, it is determined that a fire has occurred, and an on / off signal is output. Here, the on / off signal is a signal having a pulse with a certain pulse width as shown in FIG. 2, and a description will be made assuming that a portion with a pulse is on and a portion without a pulse is off.

  The on / off signal output from the signal generator 15 is configured to reduce the water discharge amount with the passage of time from the start of water discharge. That is, in the ON / OFF signal shown in FIG. 2 (a), the pulse width of the ON state to be discharged is wide at first, and the pulse width becomes smaller as time passes. The on-off valve 12 is opened when the pulse is in an on state, and the on-off valve 12 is controlled to be closed when the pulse is off.

  FIG. 2B is another example of the on / off signal, and an on-state pulse interval for water discharge is increased with the passage of time. That is, the pulse width itself is the same, and at first there are many pulses within a predetermined time, but the number of pulses existing within the predetermined time decreases with the passage of time. As described above, by changing the pulse width or pulse interval of the on / off signal, the water discharge amount is reduced with the passage of time from the start of water discharge.

  An example of an operation for extinguishing a fire in such a fire extinguishing facility will be described. First, when a fire occurs and the fire detector 18 detects a fire, a fire signal is output to the fire receiver 16. The fire receiver 16 outputs the fire signal to the signal generator 15. Here, the signal generator 15 outputs an on / off signal as shown in FIG.

  The on / off signal output from the signal generator 15 has a wide pulse width at first, so the open time of the on-off valve 12 is long, the amount of water discharged per hour is large, and the fire is sufficiently discharged to the fire flame. Weaken. Here, water is intermittently discharged from the fire extinguishing head 13 by opening and closing the on-off valve 12. Then, when the fire extinguishing water flows in the fire extinguishing pipe 11, a running water detection device (not shown) outputs a running water signal to the fire extinguishing control panel 17, and a pump of a pressurized water feeding device (not shown) is activated.

  In this way, intermittent water discharge is performed from the fire extinguishing head 13, and as the scale of the fire decreases with the passage of time, the ON / OFF signal pulse width output from the signal generating unit 15 is reduced as if it matches. It will become. And the opening time of the on-off valve 12 becomes short, and the amount of water discharge per hour decreases.

  In this way, the fire scale decreases with the passage of time from the start of water discharge, and the amount of water discharged from the fire extinguishing head also decreases accordingly, thus eliminating unnecessary water discharge and causing damage to water damage. Can be reduced.

  In the present embodiment, the water discharge amount is decreased with the passage of time from the start of water discharge by changing the pulse width or pulse interval of the on / off signal. Based on the above, the on / off signal state may be controlled to be switched.

  For example, first and second on / off signals are prepared, and the first and second on / off signals are switched and output according to the state of the sensor output of the fire detector. Here, the first on / off signal is for discharging a large amount of water for normal water discharge, and the second on / off signal is a small amount of water discharge for the time of fire extinguishing. Both the first on / off signal and the second on / off signal are signals in which pulses having a predetermined width are continuously arranged at a constant interval. However, the second on / off signal can be reduced by reducing the pulse width or increasing the pulse interval. This is designed to reduce the amount of water discharged per hour.

  In this case, when the fire detector 18 first detects a fire, a first on / off signal is output from the signal generator 15 to open and close the on-off valve 12 to intermittently discharge water. When the fire is weakened by this water discharge and the sensor output of the fire detector 18 decreases, the signal generator 15 switches the first on / off signal to the second on / off signal and outputs it. Thereby, the amount of water discharged per time discharged from the fire extinguishing head 13 is decreased, intermittent water discharge is performed, and the fire is extinguished. In this manner, since the on / off signal state is switched and controlled based on the sensor output of the fire detector 18, the amount of water discharged can be adjusted in accordance with the state of the fire scale.

  Note that the signal generation unit 15 may include two or more on / off signals, and the signals may be switched in a stepwise manner based on the sensor output of the sensor 18 to be output.

  In the present embodiment, an open fire extinguishing head has been described as an example. However, the fire extinguishing head may be a closed fire extinguishing head, and a fire extinguishing pipe base in which a plurality of fire extinguishing heads are connected without providing an on-off valve for each fire extinguishing head. An opening / closing valve may be provided on the end side. In addition, the signal generation unit is activated when the fire detector detects a fire. However, the signal generation unit may be activated when a flowing water signal is output from the flowing water detection device. Further, the ON / OFF signal may be controlled by detecting a change in the number of opened heads or the flow rate. Further, it is possible to provide a frame or the like on the orifice of the fire extinguishing head so that intermittent (intermittent) water discharge is possible, and the fire extinguishing head itself may be configured to gradually narrow the orifice and reduce the flow rate over time. .

  In addition, the pulse width or pulse interval of the on / off signal is changed so as to reduce the water discharge amount with the passage of time from the start of water discharge, but for example, the pulse height may be changed or lowered. Good. Changing the pulse height corresponds to changing the opening degree of the on-off valve, for example. That is, the open / close valve may be fully opened in the event of a fire, and the degree of opening may be reduced from the fully open state with the passage of time, and the flow rate flowing during opening may be reduced.

  The method for changing the flow rate in this way may be as follows. For example, the pump rotation speed may be changed from high speed rotation to low speed rotation as time passes. In addition, orifices with different diameters and multiple on-off valves connected in series to the orifices are prepared. In the initial stage of fire, water is supplied to the fire extinguishing head via the orifice with a larger diameter, and the diameter is reduced just before the fire is extinguished. You may make it supply water by switching an on-off valve so that an orifice may be selected.

It is a system block diagram of the fire extinguishing equipment of the present invention. It is the figure which showed an example of the on-off signal.

Explanation of symbols

11 fire extinguishing pipe, 12 on-off valve, 13 fire extinguishing head, 15 signal generator,
16 Fire receiver, 17 Fire extinguishing control panel, 18 Fire detector,

Claims (2)

In a fire extinguishing facility comprising a signal generating unit that outputs an on / off signal and a fire extinguishing head that intermittently discharges water based on the on / off signal,
A fire extinguishing equipment, wherein the pulse width, pulse interval, or pulse height of the on / off signal is changed so as to reduce the water discharge amount as time elapses from the start of water discharge. In the protective area where the fire extinguishing head is provided, a fire detector is provided,
2. The fire extinguishing equipment according to claim 1, wherein the on / off signal state is switched and controlled based on a sensor output of the fire detector.

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