JP2019166253A - Sprinkler fire fighting facility - Google Patents

Abstract

To provide a sprinkler fire fighting facility capable of preventing delay of water discharge even when a double interlock control is employed.SOLUTION: A sprinkler fire fighting facility 1 of the invention comprises: a pre-action valve 29 which is closed in a normal time; a secondary side pipeline 19 which is connected to a secondary side of the pre-action valve 29, and in which a compressed gas is sealed; a sprinkler head 21 connected to the secondary side pipeline 19; a fire disaster sensor 41 which is provided in a same protection zone as that of the sprinkler head 21 and which sends a fire disaster signal or a sensor output to the fire disaster receiver 43; a pressure sensor 45 for always detecting pressure in the secondary side pipeline 19; a signal converter 47 for inputting a detection signal of the pressure sensor 45 and calculating a change rate of the pressure, and if the calculation value becomes a prescribed value, transmitting a sprinkler actuation signal; and a fire extinguishing system control board 39 for opening the pre-action valve 29 when there are inputs of the fire disaster signal from the fire disaster receiver 43 and sprinkler actuation signal of the signal converter 47.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sprinkler fire extinguishing equipment, and more particularly to a pre-actuated sprinkler fire extinguishing equipment.

  A sprinkler fire extinguishing system is installed as a fire extinguishing system in a building larger than a certain scale. Sprinkler fire extinguishing equipment is equipment that extinguishes fire by discharging water from a sprinkler head installed on the ceiling.

  The sprinkler fire extinguishing equipment discharges water when the heat-sensitive part melts or ruptures due to the heat of the fire of the sprinkler head. However, there is a pre-actuated sprinkler fire extinguishing equipment that improves the reliability of the equipment.

  This pre-actuated sprinkler fire extinguishing equipment is connected to a pre-actuation valve that is normally closed, a secondary side pipe that is connected to the secondary side of the pre-actuation valve, filled with compressed air, etc., and a secondary side pipe. The sprinkler head and a fire detector provided in the same protection area as the sprinkler head.

  In this facility, when a fire breaks out, the fire detector operates, and based on the signal from the fire detector, the pre-actuating valve is opened, and then the sprinkler head is opened due to the heat of the fire. Air is discharged and discharged from the sprinkler head. In the case of this equipment, even if the heat-sensitive part of the sprinkler head is damaged by an external force or the like, if the fire detector is not operating, water damage does not occur in the protected area and the reliability is high.

However, since the pre-actuated sprinkler fire extinguishing system opens the pre-actuated valve due to the operation of the fire sensor, the pre-actuated valve opens when the fire sensor is activated due to non-fire, and the secondary side piping Water will flow into the inside. If water enters the secondary side piping, drainage work is required after that, but the falling pipe to which the sprinkler head is connected cannot drain water, and if a long period of time elapses, Piping may be corroded by the water and compressed air which accumulated there.
Therefore, in Patent Document 1, in the pre-actuated sprinkler fire extinguishing equipment, as a condition for opening the pre-actuating valve, in addition to the operation of the fire detector, the pressure in the secondary side pipe becomes a predetermined value or less. It is assumed that the pressure switch that detects this is activated.

With this equipment, when a fire occurs in the protected area and the sprinkler head opens, the compressed air in the secondary pipe is discharged, the pressure in the pipe drops, the pressure switch operates, and the fire is detected by the fire. The pre-actuated valve opens when the device is activated. Since the pre-actuated valve is opened under two conditions as described above, this is also called double interlock control.
In equipment that employs this double interlock control, the pre-actuating valve does not open even when the fire detector operates in a non-fire condition, so water does not flow into the secondary side piping, and normal sprinkler fire extinguishing It is excellent in that it does not easily cause water damage to the equipment.

JP 62-57569 A

  However, in the case of double interlock control, the pressure switch does not operate unless the pressure drop in the secondary side pipe drops to a predetermined value, and the pressure at the time of monitoring in the pressure switch and the pressure drop set value are set to prevent malfunction. Since the difference is large, it takes time until the pressure drop signal is issued after the sprinkler head operates, and as a result, there is a problem that water discharge is delayed.

  This invention is made | formed in order to solve this subject, and it aims at providing the sprinkler fire extinguishing equipment which can prevent a water discharge delay, employ | adopting double interlock control.

(1) The sprinkler fire extinguishing equipment according to the present invention includes a normally closed pre-acting valve, a secondary pipe connected to the secondary side of the pre-acting valve and filled with compressed gas, and the secondary pipe A sprinkler head connected to the fire detector, a fire detector provided in the same protection area as the sprinkler head, for transmitting a fire signal or sensor output to a fire receiver, and constantly detecting the pressure in the secondary side pipe A pressure sensor; a signal converter for calculating a rate of change in pressure by inputting a detection signal of the pressure sensor; and a sprinkler operation signal when the calculated value reaches a predetermined value; and a fire signal from the fire receiver And a control panel that opens the pre-actuating valve when a sprinkler operating signal is input to the signal converter.

(2) Further, in the above (1), the control panel further includes a pressure switch that operates when a pressure in the secondary side pipe reaches a predetermined value, and the control panel includes the fire signal and the signal. The pre-actuating valve is opened when either a sprinkler operating signal of the converter or a signal from a pressure switch is input.

In the present invention, a pressure sensor that constantly detects the pressure in the secondary side piping, and a detection signal of the pressure sensor is input to calculate the rate of change of pressure, and when the calculated value reaches a predetermined value, the sprinkler operation signal And a control panel that opens the pre-actuating valve when the fire signal from the fire receiver and the sprinkler operation signal of the signal converter are input.
The pressure sensor always samples the pressure value in the pipe at an extremely short time interval, and the signal converter inputs this sampling signal to calculate the rate of change of pressure at all times. The pressure drop can be detected before the pressure is reduced and reaches a predetermined value. For this reason, when the pressure in secondary side piping falls, since the pressure reduction state can be detected earlier compared with the prior art which uses a pressure switch, the effect of preventing a water discharge delay is high.

It is explanatory drawing of the whole structure of the sprinkler fire extinguishing equipment which concerns on one embodiment of this invention. It is explanatory drawing of the principal part of the sprinkler fire extinguishing equipment shown in FIG. It is a flowchart of operation | movement at the time of the fire of the sprinkler fire extinguishing equipment shown in FIG. It is explanatory drawing explaining the principal part of the other aspect of this invention. It is a flowchart of the operation | movement at the time of the fire of the other aspect shown in FIG.

Since the sprinkler fire extinguishing equipment targeted by this embodiment is a pre-actuated sprinkler fire extinguishing equipment, this outline will be described with reference to FIG.
As shown in FIG. 1, the pre-acting sprinkler fire extinguishing equipment 1 is provided with a water storage tank 3 for storing fire water on the basement floor of the building, and the fire water in the water storage tank 3 is supplied to the water supply main 7 by a fire pump 5. The A pressure tank 9 used to start the fire pump 5 is connected to the water supply main pipe 7, and the pressure water of the water supply main pipe 7 is introduced into the pressure tank 9 to compress the air inside. Yes. The pressure tank 9 is provided with a pressure switch 11, and when the pressure switch 11 detects a depressurization below a specified pressure, this depressurization signal is output to the pump control panel 13 and the fire pump 5 is activated. Yes.

A branch pipe 15 is drawn out from the water supply main pipe 7 for each protection section, and a pre-actuated water flow detection device 17 is provided in the branch pipe 15. A closed-type sprinkler head 21 is attached to the secondary side of the pre-actuated flow detection device 17 in the branch pipe 15, that is, the secondary side pipe 19, and a test valve 23 is provided at the end of the secondary side pipe 19. It has been. Further, compressed air pressurized to a predetermined pressure by the compressor 25 is supplied to the secondary side pipe 19 via an air pipe 27.
The pre-actuated running water detector 17 includes a pre-actuating valve 29, an electric valve 31 that opens the pre-acting valve 29, a pressure switch 33 that detects pressure reduction, and a running water detection switch 35.
The motor-operated valve 31, the pressure switch 33, and the flowing water detection switch 35 are electrically connected to a fire extinguishing system control panel 39 as a control panel of the present invention via a valve relay 37, so that signal transmission is possible.

  In addition, a fire detector 41 is installed in the protection area where the sprinkler head 21 is installed, and a detection signal of the fire detector 41 is input to the fire receiver 43, and is sent from the fire receiver 43 to the fire extinguishing system control panel 39. A fire signal is input.

  The above is an outline of a general pre-acting sprinkler fire extinguishing equipment. In the present invention, as shown in FIG. 1, the pressure sensor 45 that constantly detects the pressure in the secondary pipe 19, and the pressure sensor 45 A signal converter 47 is provided that inputs a detection signal, calculates the rate of change in pressure, and transmits a sprinkler actuation signal when the calculated value reaches a predetermined value. An emergency power supply device 49 is connected to the signal converter 47 and the pressure sensor 45. Since power is supplied from the emergency power supply device 49, the signal converter 47 can correctly transmit the sprinkler operation signal even when a fire occurs and a power failure occurs. The output of the signal converter 47 is input to the valve relay 37.

  Further, the fire extinguishing system control panel 39 of the present invention is a motor-operated valve when the fire signal from the fire receiver 43 and the sprinkler operation signal of the signal converter 47 or the signal of the pressure switch 33 are input. 31 is controlled to open the pre-actuating valve 29.

The pressure sensor 45 always samples the pressure value in the pipe at an extremely short time interval, and the signal converter 47 inputs this sampling signal and always calculates the rate of change in pressure. The pressure drop can be detected before the pressure decreases to reach a predetermined value. For this reason, since the depressurized state can be detected very early as compared with the conventional example using the pressure switch that operates when the pressure in the secondary side pipe 19 falls below a predetermined value, the effect of preventing a delay in water discharge is high.
Here, the pressure change rate calculated by the signal converter 47 will be described. The signal converter 47 periodically samples the output value of the pressure sensor 45. For example, every time sampling is performed, the difference between the output value sampled this time and the previous output value is determined to determine whether the pressure tends to decrease. . When the pressure decreasing trend continues several times and is a pressure drop of a predetermined value or more, the signal converter 47 outputs a sprinkler operation signal to the valve relay 37.
If the pressure at which the pressure switch operates is A and the pressure in the secondary side pipe 19 in the monitored state is B, the pressure is higher than the pressure C, which is an intermediate value between the pressure A and the pressure B. When the sprinkler operation signal is output when there is a certain pressure decrease tendency, the pressure drop in the secondary side arrangement 19 can be detected at an early stage.

The operation of the pre-actuated sprinkler fire extinguishing equipment 1 of the present embodiment configured as described above will be described with reference to FIGS.
<Monitoring status>
In the monitoring state, the pressure sensor 45 constantly detects the pressure in the secondary side pipe 19, and the signal converter 47 calculates the rate of change in pressure. However, the signal converter 47 does not transmit the sprinkler actuation signal to the valve relay 37 unless the calculated change rate exceeds a predetermined value set in advance.

<Operation at fire>
In the event of a fire, first, the fire detector 41 is first activated (S1), the signal is input to the fire receiver 43, and the fire receiver 43 transmits the fire signal to the fire extinguishing system control panel 39 (S2).
Here, a case where it is determined whether the fire detector 41 itself is a fire will be described. That is, when the output value detected by the fire detector 41 exceeds a predetermined value and is determined to be a fire, the fire detector 41 transmits a fire signal to the fire receiver 43. On the other hand, even if it is a case where the fire receiver 43 judges whether it is a fire, this invention is applicable. In this case, a sensor output is transmitted from the fire detector 41 to the fire receiver 43, and the sensor output is compared with a predetermined value to determine whether or not the fire receiver 43 is a fire. In any case, when a fire occurs, a fire signal from the fire receiver 43 is input to the fire extinguishing system control panel 39.
Next, when the sprinkler head 21 is opened by the heat of the fire and the pressure of the secondary side pipe 19 is reduced (S3), the rate of change in pressure, which is the calculated value of the signal converter 47, exceeds a predetermined value. The signal converter 47 transmits a sprinkler operation signal to the fire extinguishing system control panel 39 via the valve relay 37 (S4).

  As described above, the pressure sensor 45 always samples the pressure value in the pipe at an extremely short time interval, and the signal converter 47 inputs this sampling signal and always calculates the rate of change in pressure. The pressure drop can be detected before the pressure in the secondary pipe 19 is reduced to reach a predetermined value, and the reduced pressure state can be detected very early after the sprinkler head 21 is opened.

When the fire extinguishing system control panel 39 inputs both the fire signal and the sprinkler operation signal, the fire extinguishing system control panel 39 controls the motor operated valve 31 to open the pre-actuating valve 29 (S5). When the pre-actuating valve 29 is opened, the water continuously flows from the water supply main pipe 7 to detect the flow of the water, the flowing water detection switch 35 is activated, and the flowing water signal is sent to the fire extinguishing system control panel 39. Transmit (S6). When the fire fighting system control panel 39 receives the running water signal (S7), the running water signal is also transmitted from the fire fighting system control board 39 to the fire receiver 43 (S8).
Further, when the pre-actuating valve 29 is opened, the pressure of the primary side pipe of the pre-acting valve 29 in the branch pipe 15 is reduced, whereby the pressure switch 11 provided in the pressure tank 9 is activated, and the pump control panel 13 is Fire extinguishing pump 5 is started.
When the fire extinguishing pump 5 is activated, pressurized fire extinguishing water is supplied to the secondary side pipe 19 through the water supply main pipe 7 and discharged from the activated sprinkler head 21 to extinguish the fire (S9).

<In case of malfunction of fire detector>
When the fire detector 41 is operated by a non-fire, a fire signal is input to the fire extinguishing system control panel 39, but a sprinkler operation signal is not input. Therefore, the fire extinguishing system control panel 39 does not open the pre-actuating valve 29. For this reason, fire-extinguishing water is not supplied to the secondary side piping 19, and the draining operation does not occur.

<In case of pressure sensor failure>
When the pressure sensor 45 fails, there is a case where a sprinkler operation signal is not transmitted despite a fire. However, since the sprinkler head 21 is opened, the pressure in the secondary side pipe 19 is reduced. Therefore, when the pressure in the secondary side pipe 19 is reduced to a predetermined value, the pressure switch 33 is activated and the signal of the pressure switch 33 is Is input to the fire extinguishing system control panel 39 via the valve relay 37.
In the case of a fire, since a fire signal is input to the fire extinguishing system control panel 39, if the fire extinguishing system control panel 39 receives a signal from the pressure switch 33, for example, a sprinkler operation signal from the signal converter 47 is input. Even if not, the pre-actuating valve 29 is opened.

  As described above, in the present embodiment, even when the pressure sensor 45 fails, the worst situation in which water is not discharged at the time of a fire can be surely avoided, and the reliability as a fire extinguishing facility is high.

The case where the fire detector 41 malfunctions is a case where the fire detector 41 itself is not broken, but the fire detector 41 is operated by a non-fire phenomenon such as steam. It is also conceivable that 41 itself fails.
Therefore, in order to cope with such a situation, it is more preferable to adopt the following configuration.
That is, as shown in FIG. 4, the fire receiver 43 transmits a failure signal to the fire extinguishing system control board 39. When the fire extinguishing system control board 39 receives the fault signal, no fire signal is input thereafter. When the signal from the signal converter 47 or the signal from the pressure switch 33 is input, the motor-operated valve 31 is controlled to open the pre-actuating valve 29.

The operation when the above configuration is adopted will be described with reference to FIGS.
When the fire detector 41 breaks down and the fire receiver 43 receives a failure signal, a failure / linkage cutoff signal is transmitted to the fire extinguishing system control panel 39 (S11). Upon receiving this signal, the fire extinguishing system control panel 39 switches to a single mode in which the pre-actuating valve 29 is opened if there is a pressure drop in the secondary side pipe even if there is no fire signal (S12).
In this state, when a fire occurs and the sprinkler head 21 is activated (S13), the signal converter 47 passes through the valve relay 37 because the pressure change rate, which is the calculated value of the signal converter 47, exceeds a predetermined value. The sprinkler operation signal is transmitted to the fire extinguishing system control panel 39 (S14). The fire extinguishing system control panel 39 controls the motor operated valve 31 to open the pre-actuating valve 29 when the sprinkler operating signal is input even if no fire signal is input (S15). When the pre-actuating valve 29 is opened, the running water detection switch 35 is activated and a running water signal is transmitted to the fire extinguishing system control panel 39 (S16), and the fire extinguishing system control board 39 receives the running water signal via the valve relay 37. (S17).
After the pre-actuating valve 29 is opened, the same operation as described in FIG. 3 is performed to extinguish the fire (S18).

  In this way, when the fire receiver 43 receives the failure signal of the fire detector 41, the fire detector 41 is operated by operating the fire extinguishing system control panel 39 alone thereafter. Even in the event of a failure, the worst situation where water is not discharged in the event of a fire can be reliably avoided, and the fire extinguishing equipment is highly reliable.

In the present embodiment, a pressure sensor is used instead of the pressure switch, and the change rate of the pressure is calculated by the signal converter. The signal converter outputs a sprinkler operation signal when the pressure change rate exceeds a predetermined value. For example, the pressure value sampled from the pressure sensor is transmitted to the fire extinguishing system control panel via the valve relay. You may comprise as follows. In this case, the fire extinguishing system control panel has a display unit that can directly display the pressure value in the secondary side pipe, and the administrator can visually recognize the change in the pressure value over a certain period of time. When there is an increase in pressure in the pipe, the administrator can lower the pressure in the pipe by opening the test valve 23 or the like.
Further, in this embodiment, the fire receiver and the fire extinguishing system control panel are provided, but they may be configured as an integrated board in which the functions of these panels are combined into one.

1 Pre-acting sprinkler fire extinguishing equipment 3 Water storage tank 5 Fire extinguishing pump 7 Main water supply 9 Pressure tank 11 Pressure switch (pressure tank)
DESCRIPTION OF SYMBOLS 13 Pump control panel 15 Branch pipe 17 Pre-acting type flowing water detection apparatus 19 Secondary side piping 21 Sprinkler head 23 Test valve 25 Compressor 27 Air piping 29 Pre-acting valve 31 Electric valve 33 Pressure switch (Pre-acting type flowing water detecting apparatus)
35 Flowing water detection switch 37 Valve relay 39 Fire extinguishing system control panel 41 Fire detector 43 Fire receiver 45 Pressure sensor 47 Signal converter 49 Emergency power supply

Claims (2)

  A normally closed pre-acting valve, a secondary side pipe connected to the secondary side of the pre-acting valve and filled with compressed gas, a sprinkler head connected to the secondary side pipe, and the sprinkler head; A fire sensor that is installed in the same protected area and transmits a fire signal or sensor output to a fire receiver, a pressure sensor that constantly detects the pressure in the secondary pipe, and a detection signal of the pressure sensor are input. Then, when the rate of change of pressure is calculated and the calculated value reaches a predetermined value, a signal converter that transmits a sprinkler operation signal, a fire signal from the fire receiver, and a sprinkler operation signal of the signal converter are input. A sprinkler fire extinguishing equipment, comprising: a control panel that opens the pre-actuating valve when there is.   The pressure switch further operates when the pressure in the secondary side pipe reaches a predetermined value, and the control panel is one of the fire signal, a sprinkler operation signal of the signal converter, or a signal from the pressure switch. 2. The sprinkler fire extinguishing system according to claim 1, wherein the pre-actuating valve is opened when one signal is input.

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