JP7318065B2 - Sprinkler fire extinguishing equipment - Google Patents

Description

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

Buildings of a certain size or larger are provided with sprinkler fire extinguishing equipment as fire extinguishing equipment. A sprinkler fire extinguishing system is a system for extinguishing a fire by spraying water from a sprinkler head installed on the ceiling.

A sprinkler fire extinguishing system discharges water when the heat-sensitive part of the sprinkler head melts or bursts due to the heat of a fire. A pre-activated sprinkler fire extinguishing system is one of the more reliable equipment.

This pre-activation type sprinkler fire extinguishing system is connected to a pre-activation valve that is normally closed, a secondary-side pipe that is connected to the secondary side of the pre-activation valve and filled with compressed air, etc., and a secondary-side pipe. and a fire detector installed in the same protected area as the sprinkler head.

In this equipment, when a fire breaks out, a fire detector is activated, and based on the signal from the fire detector, the pre-activation valve is opened. After that, when the sprinkler head is opened by the heat of the fire, the compression in the pipe Air is expelled and water is 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, as long as the fire detector does not operate, water damage will not occur in the protected area and the reliability is high.

However, in pre-activated sprinkler fire extinguishing equipment, the pre-activation valve opens when the fire detector is activated. Water will flow inside. If water enters the secondary pipe, it will be necessary to drain the water afterwards. Accumulated water and compressed air may corrode the piping.
Therefore, in Patent Document 1, in the pre-activation type sprinkler fire extinguishing equipment, the condition for opening the pre-activation valve is that the fire sensor operates and the pressure in the secondary side pipe falls below a predetermined value. A pressure switch that detects this is to operate.

In this equipment, when a fire breaks out in the protected area and the sprinkler head opens, the compressed air in the secondary side pipe is discharged, the pressure in the pipe drops, the pressure switch operates, and the fire detects the fire. The pre-actuation valve opens when the device operates. Since the pre-actuation valve is opened under these two conditions, it is also called double interlock control.
In equipment that employs this double interlock control, even if the fire detector is activated when there is no fire, the pre-activation valve does not open. It is excellent in that water damage is less likely to occur to the equipment.

JP-A-62-57569

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. Since the difference is large, it takes time for the pressure drop signal to be output after the sprinkler head operates, resulting in a problem of water discharge delay.

As a solution to such a problem, the applicant of the present application (Japanese Patent Application No. 2018-58038) uses a pressure sensor instead of a pressure switch, and inputs the detection signal of the pressure sensor to calculate the pressure change rate. and has a signal converter that transmits a sprinkler activation signal when the calculated value reaches a predetermined value, transmits the fire signal from the fire detector or the sensor output to the fire receiver, and receives the fire signal from the fire receiver and the sprinkler activation signal of the signal converter are input to the fire extinguishing system control panel, and the pre-activation valve is opened when these two signals are input.
According to this sprinkler fire extinguishing system of the previous application, it is possible to detect a pressure drop before the pressure in the secondary side pipe is reduced and reaches a predetermined value, and the reduced pressure state can be detected earlier than the conventional example using a pressure switch. Therefore, the effect of preventing water discharge delay is high.

However, it is also possible that the fire receiver and the fire extinguishing system control panel may fail, and the issue of how to deal with the failure of these devices remains unsolved.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such problems. The purpose is to provide facilities.

(1) A sprinkler fire extinguishing system according to the present invention comprises a normally closed preactivation valve, a secondary side pipe connected to the secondary side of the preactivation valve and filled with compressed gas, and the secondary side pipe. a sprinkler head connected to a fire receiver provided in the same protected area as the sprinkler head and receiving a fire signal or sensor output from a fire sensor; a sensor, a signal converter for inputting a detection signal of the pressure sensor to calculate a pressure change rate and transmitting a sprinkler activation signal when the calculated value reaches a predetermined value, a fire signal from the fire receiver and the a control panel that opens the pre-actuation valve when a sprinkler activation signal is input from the signal converter;
The fire receiver has a function of transmitting a failure signal to the control panel, and when the control panel receives the failure signal, the control panel receives the sprinkler operation signal even if the fire signal is not input. Switching to control for opening the pre-actuation valve, notifying the failure signal to the signal converter, and when the signal converter receives the notification, the signal converter changes the condition for transmitting the sprinkler operation signal to a more severe condition. and

(2) In addition, in the device described in (1) above, the pressure change rate calculated by the signal converter is a straight line by the least squares method with respect to the relationship between the pressure value acquired at each predetermined time and the acquisition time. It is the slope of the regression line that has undergone regression, and the stricter condition is characterized by increasing the threshold value of the slope for transmitting the sprinkler activation signal or increasing the number of data for linear regression.

(3) Furthermore, the sprinkler fire extinguishing equipment according to the present invention includes a normally closed pre-actuation valve, a secondary side pipe connected to the secondary side of the pre-actuation valve and filled with compressed gas, the secondary A sprinkler head connected to the side pipe, a fire receiver provided in the same protected area as the sprinkler head and receiving a fire signal or sensor output from a fire sensor, and constantly detecting the pressure in the secondary side pipe. a signal converter for inputting a detection signal of the pressure sensor, calculating a pressure change rate, and transmitting a sprinkler activation 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-actuation valve when a sprinkler activation signal is input from the signal converter,
The signal converter has a function of opening the pre-actuation valve instead of the control panel when communication with the control panel becomes impossible, and when communication with the control panel becomes impossible, the control panel It is characterized in that the pre-actuation valve is opened under a condition that is stricter than the conditions under which the sprinkler actuation signal is transmitted when communication with is established.

The sprinkler fire extinguishing system according to the present invention includes a pressure sensor that constantly detects the pressure in the secondary side pipe, and a detection signal from the pressure sensor to calculate a pressure change rate, and the calculated value reaches a predetermined value. and a control panel for opening the pre-activation valve when the fire signal from the fire receiver and the sprinkler activation signal from the signal converter are input. Therefore, a pressure drop in the secondary side pipe can be detected before the pressure in the secondary side pipe decreases and reaches a predetermined value. For this reason, compared with the conventional example using a pressure switch, the decompression state can be detected early, so the effect of preventing water discharge delay is high.
Further, the fire receiver has a function of transmitting a failure signal to the control panel, and when the control panel receives the failure signal, the sprinkler operation signal is input even if the fire signal is not input. Switching to control for opening the pre-actuation valve, notifying the signal converter of the failure signal, and upon receiving the notification, the signal converter changes the condition for transmitting the sprinkler actuation signal to a more severe condition. Therefore, even if there is a failure of the fire receiver, appropriate measures can be taken without causing a delay in water discharge.

BRIEF DESCRIPTION OF THE DRAWINGS 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. 1. It is explanatory drawing of the determination method by the pressure change rate in the signal converter of the sprinkler fire extinguishing equipment shown in FIG. 1 (part 1). FIG. 2 is an explanatory diagram of a determination method based on a pressure change rate in the signal converter of the sprinkler fire extinguishing system shown in FIG. 1 (Part 2); 1. It is explanatory drawing explaining the effect of the determination method by the pressure change rate in the signal converter of the sprinkler fire extinguishing equipment shown in FIG. 1 (part 1). It is explanatory drawing explaining the effect of the determination method by the pressure change rate in the signal converter of the sprinkler fire extinguishing equipment shown in FIG. 1 (part 2). It is explanatory drawing explaining the function of a signal converter when a fire receiver breaks down (Part 1). It is explanatory drawing explaining the function of a signal converter when a fire receiver breaks down (part 2). It is explanatory drawing explaining the function of a signal converter when a fire receiver breaks down (part 3). FIG. 2 is a flow chart of the operation of the sprinkler fire extinguishing system shown in FIG. 1 at the time of fire; FIG. It is explanatory drawing explaining the state which the fire receiver of the sprinkler fire extinguishing equipment shown in FIG. 1 failed. FIG. 2 is a flow chart of the operation at the time of fire when the fire receiver of the sprinkler fire extinguishing system shown in FIG. 1 fails. FIG. It is an explanatory view explaining the state where the fire extinguishing system control panel of the sprinkler fire extinguishing equipment shown in FIG. 1 has failed.

[Embodiment 1]
Since the sprinkler fire extinguishing system to which the present embodiment is directed is a pre-activation sprinkler fire extinguishing system, its outline including the equipment configuration provided in the conventional example will be described based on FIG.
As shown in FIG. 1, the pre-activated sprinkler fire extinguishing system 1 is provided with a water tank 3 for storing fire extinguishing water on the basement floor of the building. be. The water supply main pipe 7 is connected to a pressure tank 9 used for starting the fire pump 5, and the pressure tank 9 is configured to introduce the pressure water of the water supply main pipe 7 and compress the air inside. there is The pressure tank 9 is provided with a pressure switch 11, and when the pressure switch 11 detects pressure reduction below a specified pressure, the pressure reduction signal is output to the pump control panel 13 to start the fire pump 5. there is

A branch pipe 15 is led out from the main water supply pipe 7 for each protected area, and the branch pipe 15 is provided with a pre-activated water flow detection device 17 . A closed sprinkler head 21 is attached to the secondary side of the pre-activation type flow detector 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 is Compressed air (corresponding to compressed gas in claims) pressurized to a predetermined pressure by a compressor 25 is supplied to the secondary pipe 19 via an air pipe 27 .
The pre-activation type running water detection device 17 includes a pre-activation valve 29 , an electric valve 31 that opens the pre-activation valve 29 , a pressure switch 33 that detects pressure reduction, and a water flow detection switch 35 .
Further, the secondary pipe 19 is provided with a pressure sensor 45 for constantly detecting internal pressure. The pressure sensor 45 constantly samples the pressure value in the pipe at extremely short time intervals (for example, 10 msec intervals) and outputs the sampled values to the signal converter 47, which will be described later.

The pressure sensor 45, the motor operated valve 31, the pressure switch 33, and the water flow detection switch 35 are electrically connected to a signal converter 47, enabling signal transmission.
The signal converter 47 has the function of inputting the detection signal of the pressure sensor 45, calculating the rate of change in pressure, and transmitting a sprinkler activation signal, which is a signal for activating the sprinkler, when the calculated value reaches a predetermined value. I have.

Further, the signal converter 47 is provided with an emergency power supply device 49 from which power is constantly supplied to the signal converter 47 and the pressure sensor 45 . Therefore, the signal converter 47 can correctly transmit the sprinkler activation signal even in the event of a fire and power failure.
Since one signal converter 47 is provided corresponding to one pre-activation type running water detection device 17, a plurality of signal converters 47 exist in one building. 47 is connected to the fire extinguishing system control panel 39 as the control panel of the present invention to enable signal transmission.

In addition, a fire sensor 41 is installed in the protected area where the sprinkler head 21 is installed. A fire signal is input to the system control panel 39 . The fire receiver 43 also has a function of transmitting a failure signal to the fire extinguishing system control panel 39 when the fire receiver 43 fails or the fire sensor 41 fails (see FIG. 2).
The above is a case where the fire sensor 41 determines that there is a fire. Then, the fire receiver 43 compares the sensor output with a predetermined value to determine whether or not there is a fire. When the fire receiver 43 determines that there is a fire, a fire signal based on that determination is input to the fire extinguishing system control panel 39 .

The fire extinguishing system control panel 39 controls the motor-operated valve 31 when a fire signal from the fire receiver 43 and either a sprinkler activation signal from the signal converter 47 or a signal from the pressure switch 33 is input. , is arranged to open the pre-actuation valve 29 .
Further, when a failure signal is input from the fire receiver 43, the fire extinguishing system control panel 39 notifies the failure signal to the signal converter 47 (see FIG. 2). It is configured to control the motor-operated valve 31 and open the pre-actuation valve 29 when either the sprinkler actuation signal or the signal from the pressure switch 33 is input.

Signal transmission between the signal converter 47 and the fire extinguishing system control panel 39 is a so-called polling method, in which the fire extinguishing system control panel 39 calls the signal converter 47, and the signal converter 47 reports its status. It is common to adopt a method of informing.
However, in the case of this method, when a plurality of signal converters 47 are connected to the fire extinguishing system control panel 39, the fire extinguishing system control panel 39 sequentially calls from the signal converter 47 at the head. Since there is a time lag between when the fire extinguishing system control panel 39 is ready to send the sprinkler operation signal and when it actually sends the signal, it takes time to send the information to the fire extinguishing system control panel 39 .
Therefore, if the signal converter 47 and the fire extinguishing system control panel 39 are connected by a dedicated line, and the signal converter 47 transmits the sprinkler activation signal, the fire extinguishing system control panel 39 does not wait for the call to start at that point. A signal is preferably sent to the fire extinguishing system control board 39 . By doing so, it is possible to shorten the time from when the signal converter 47 issues the sprinkler activation signal to when water is discharged.

Characteristic functions of the signal converter 47 include a function (first function) of calculating a pressure change rate and transmitting a sprinkler activation signal, and a function of generating a sprinkler activation signal when a failure signal transmitted by the fire receiver 43 is received. is changed to a stricter condition (algorithm that sends a sprinkler activation signal when it is determined that a fire is more certain), and a sprinkler activation signal is transmitted based on the changed algorithm. It has a function (second function) to
These functions will be described in detail below.

<About the first function>
As a method for obtaining the pressure change rate calculated by the signal converter 47, in the present embodiment, a linear regression is performed by the least squares method on the relationship between the pressure value obtained at predetermined time intervals and the obtained time. I try to find it as a slope.
Specifically, as shown in FIG. 3, pressure value sampling data is acquired every 10 ms. Find the slope of the regression line obtained by linear regression by the least squares method in the graph with the value and the horizontal axis X as time.
Since FIG. 4 is a schematic diagram, only four pieces of sampling data are shown, but in practice, linear regression is performed using about 200 pieces of data as described above. However, the greater the number of data, the less the influence of electrical noise and the higher the accuracy. However, the linear regression takes time.
If this is expressed by a formula, it will be as follows.
Slope = XY covariance/X variance where XY covariance = (xi*yi) mean - (xi mean * yi mean)
X variance = sum((xi mean - xi)^2)
i = 1 to 199

As shown in FIG. 3, the slope is calculated at predetermined time intervals (10 msec×20=200 msec=0.2 sec in the example of FIG. 3) and compared with a predetermined threshold value to determine whether the sprinkler is activated. Determine whether signal transmission is necessary.
For example, as shown in FIG.
(i) The slope is calculated by the "least squares method" using the data from n1 to n199, and is compared with the threshold value for judgment.
(ii) Calculate the slope using the "least squares method" using the data from n21 to n219, and compare it with the threshold value for judgment.
(iii) Calculate the slope using the "least squares method" with the data from n41 to n239, and compare it with the threshold value for judgment.
(iv) n61~... (Omitted)...
When the slope value exceeds the threshold, the signal converter 47 outputs a sprinkler activation signal to the fire suppression system control board 39 .

The effect of obtaining the pressure change rate as described above will be described with reference to FIGS. 5 and 6. FIG.
FIG. 5 is a graph showing pressure changes based on sampling data output from 199 pressure sensors (approximately 2 seconds) every 10 ms in a monitoring state in which there is practically no pressure change. indicates pressure (kPa), and the horizontal axis indicates time (seconds).
As shown in FIG. 5, the pressure value based on the sampling data output from the pressure sensor constantly changes in an extremely short period of time. This change does not indicate actual pressure change, but is a change due to electrical noise.
When the pressure change rate is obtained based on the sampling data affected by such electrical noise, for example, when the slope is calculated from only the first and last values in a predetermined time interval, one point in FIG. As indicated by the dashed line, it becomes a straight line with a constant slope. Having a constant slope indicates that the pressure is changing, and that there is a pressure change even though there is actually no pressure change.

On the other hand, when the slope of the regression line obtained by performing the linear regression by the method of least squares is obtained, the slope becomes a straight line with almost zero slope as indicated by the dashed line in FIG.
In this way, by using the least squares method, it is possible to accurately capture the actual pressure change while excluding the influence of electrical noise.

FIG. 6 is a graph showing changes in pressure value based on sampling data when the sprinkler head is operated, and a straight line obtained by the method of least squares is shown in the graph.
The slope of the straight line is about -1.557 kPa/sec as shown in the figure, which correctly represents the pressure change rate when the sprinkler is activated.

As described above, since the signal converter 47 has the first function, the pressure value in the pipe is always sampled at extremely short time intervals, and the signal converter 47 inputs this sampling signal to constantly measure changes in pressure. Since the ratio is calculated, a pressure drop can be detected before the pressure in the secondary side pipe 19 decreases and reaches a predetermined value. For this reason, compared with the conventional example using only the pressure switch, the decompression state can be detected very early, so the effect of preventing water discharge delay is high.
Moreover, in the present embodiment, the pressure change rate is calculated using the method of least squares, so the influence of electrical noise can be reduced as much as possible.

In addition, in the present invention, the calculation of the pressure change rate by the signal converter 47 is not limited to the one described above, and may be, for example, as follows.
The signal converter 47 periodically samples the output value of the pressure sensor 45. For example, each time sampling is performed, the output value sampled this time is subtracted from the previous output value to determine whether the pressure tends to decrease. . The signal converter 47 outputs a sprinkler activation signal to the fire extinguishing system control panel 39 when the decreasing tendency of the pressure continues several times and the pressure decrease is equal to or greater than a predetermined value.
When the pressure at which the pressure switch 33 operates is A, and the pressure in the secondary pipe 19 in the normal state, that is, in the monitoring state, is B, the pressure is higher than the pressure C, which is the intermediate value between the pressure A and the pressure B. By outputting the sprinkler activation signal when the pressure tends to decrease to a certain extent, the pressure decrease in the secondary side pipe 19 can be detected at an early stage.

<About the second function>
The second function, as described above, is to set the algorithm for transmitting the sprinkler activation signal under stricter conditions (the (algorithm for transmitting a sprinkler activation signal when the condition is determined to be the same), and transmits a sprinkler activation signal based on the algorithm after the change.
A case where the function of transmitting the normal sprinkler activation signal is based on the above-described least-squares method will be described with reference to FIGS. 7 to 9. FIG.
FIG. 7 is a graph showing pressure changes based on sampling data obtained by the pressure sensor 45 every 10 milliseconds. 8 and 9 are graphs showing changes over time in the slope of the regression line obtained by the least squares method based on the data in FIG. 7, where the vertical axis indicates the slope and the horizontal axis indicates time. . FIG. 8 shows the case where the inclination is obtained based on 100 data acquired every 10 ms, and FIG. 9 shows the case where the inclination is found based on 200 data acquired every 10 ms. ing.

Comparing the graph of FIG. 8 and the graph of FIG. 9, it can be seen that the data in FIG. 9 have less variation and the slope is gentler. It can be seen that the accuracy is improved because the data variation is small. Further, since the inclination is gentle, when the inclination reaches a predetermined value or more, the sprinkler activation signal is transmitted. In the case of FIG. 8, the sprinkler activation signal is transmitted, but in the case of FIG. There may be a situation where the Therefore, in FIG. 9, the algorithm for issuing the sprinkler activation signal is subjected to stricter conditions, that is, in FIG. It can be said that it is an algorithm to transmit.

As a more severe condition, it is possible to change the condition, for example, to slightly increase the value of the slope of the regression line that emits the sprinkler activation signal in order to eliminate the influence of the variation.

Next, the operation of the preactivation sprinkler fire extinguishing system 1 of the present embodiment configured as described above will be described with reference to FIGS. 2 and 10. FIG.
<Monitoring status>
In the monitoring state, the pressure sensor 45 constantly detects the pressure of the secondary side pipe 19, and the signal converter 47 calculates the pressure change rate. However, the signal converter 47 does not send the sprinkler activation signal to the fire extinguishing system control panel 39 unless the calculated pressure change rate exceeds a predetermined value.

<Action in case of fire>
In the event of a fire, the fire sensor 41 is normally activated (S1), its 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 the fire sensor 41 itself determines whether there is a fire will be described. That is, when the output value detected by the fire sensor 41 exceeds a predetermined value and it is determined that there is a fire, the fire sensor 41 transmits a fire signal to the fire receiver 43 . As described above, the present invention can be applied even when the fire receiver 43 determines whether there is a fire. In this case, the sensor output is transmitted from the fire sensor 41 to the fire receiver 43, and the sensor output is compared with a predetermined value to determine whether the fire receiver 43 is on fire. In either case, when a fire breaks out, 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 in the secondary pipe 19 is reduced (S3), the pressure change rate calculated by the signal converter 47 exceeds a predetermined value. The device 47 sends a sprinkler activation signal to the fire extinguishing system control panel 39 (S4).

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

When both the fire signal and the sprinkler activation signal are input, the fire extinguishing system control panel 39 controls the motor-operated valve 31 to open the pre-activation valve 29 (S5). When the pre-activation valve 29 is opened, water continues to flow from the water supply main pipe 7, the water flow is detected, the water flow detection switch 35 operates, and a water flow signal is sent to the fire extinguishing system control panel 39. Send (S6). When the fire extinguishing system control panel 39 receives the water flow signal (S7), the fire extinguishing system control panel 39 also transmits the water flow signal to the fire receiver 43 (S8).
Further, when the pre-actuation valve 29 is opened, a pressure drop occurs in the primary side pipe of the pre-actuation valve 29 in the branch pipe 15, and this causes the pressure switch 11 provided in the pressure tank 9 to operate, causing the pump control panel 13 to 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 fire detector malfunction>
When the fire detector 41 is activated by non-fire, the fire signal is input to the fire extinguishing system control panel 39, but the sprinkler activation signal is not input. Therefore, the fire extinguishing system control panel 39 does not open the pre-activation valve 29 . Therefore, the fire extinguishing water is not supplied to the secondary side pipe 19, and the draining work is not required.

<If the pressure sensor fails>
If the pressure sensor 45 fails, it is possible that the sprinkler activation signal will not be sent even though there is a fire. However, when the sprinkler head 21 is opened, the pressure inside the secondary pipe 19 is reduced. is input to the fire extinguishing system control panel 39 via the signal converter 47 .
In the event of a fire, the fire signal is input to the fire extinguishing system control panel 39, so when the fire extinguishing system control panel 39 receives the signal input from the pressure switch 33, the sprinkler activation signal from the signal converter 47 is input. Open the pre-actuation valve 29 even if it has not been done.

As described above, in the present embodiment, even if the pressure sensor 45 fails, it is possible to reliably avoid the worst situation in which water is not discharged in the event of a fire, and the reliability of the fire extinguishing equipment is high.

<If the fire detector or fire receiver breaks down>
When the fire detector 41 or fire receiver 43 fails, the fire receiver 43 sends a failure signal to the fire extinguishing system control panel 39 as shown in FIG. When the fire extinguishing system control panel 39 receives the failure signal, it transmits the failure signal to the signal converter 47, and after that, even if there is no input of the fire signal, either the signal of the signal converter 47 or the signal of the pressure switch 33 is transmitted. When such a signal is input, the motor-operated valve 31 is controlled to open the pre-actuation valve 29 .

Then, when the signal converter 47 receives a failure signal from the fire extinguishing system control panel 39, the above-described second function determines whether or not to send a sprinkler activation signal under stricter conditions.

The operation when the fire sensor 41 or fire receiver 43 fails will be described with reference to FIGS. 11 and 12. FIG.
When the fire sensor 41 or the fire receiver 43 fails, the fire receiver 43 transmits a failure signal to the fire extinguishing system control panel 39 (S11). Upon receiving this signal, the fire extinguishing system control panel 39 switches to the independent mode in which the pre-activation valve 29 is opened if there is a pressure drop in the secondary side pipe 19 even if there is no fire signal (S12).

In this state, when a fire breaks out and the sprinkler head 21 is activated (S13), the pressure change rate calculated by the signal converter 47 exceeds a predetermined value. A sprinkler activation signal is transmitted (S14). The fire extinguishing system control panel 39 controls the motor-operated valve 31 to open the pre-activation valve 29 when the sprinkler activation signal is input even if the fire signal is not input (S15). When the pre-activation valve 29 is opened, the water flow detection switch 35 is activated, a water flow signal is transmitted to the fire extinguishing system control panel 39 (S16), and the fire extinguishing system control panel 39 receives the water flow signal via the signal converter 47. (S17).
After the pre-activation valve 29 is opened, the same operation as described with reference to FIG. 10 is performed to extinguish the fire (S18).

As described above, when the fire sensor 41 or the fire receiver 43 fails, the fire suppression system control panel 39 alone operates the pre-actuation valve 29, thereby preventing the fire sensor 41 or the fire receiver from Even if 43 fails, it is possible to reliably avoid the worst situation in which water is not discharged in the event of a fire, and the reliability of the fire extinguishing equipment is high.
Moreover, since the algorithm for transmitting the sprinkler activation signal by the signal converter 47 is switched to one with stricter conditions, it is possible to prevent the sprinkler activation signal from being transmitted when there is no fire.

[Embodiment 2]
In the first embodiment, the fire sensor 41 or the fire receiver 43 has failed. This relates to a sprinkler fire extinguishing system that takes measures in case of fire.

The sprinkler fire extinguishing system of the present embodiment differs from the first embodiment with respect to the function of the signal converter 47. The signal converter 47 of the present embodiment, as shown in FIG. is disabled, the motor-operated valve 31 is controlled instead of the fire extinguishing system control panel 39 to open the pre-activation valve 29 .

Moreover, the conditions for the signal converter 47 to open the pre-activation valve 29 are set to be stricter conditions than when communication with the fire extinguishing system control panel 39 is established.
The stricter conditions here are the same as those described in the first embodiment.
The signal converter 47 also receives information from the pressure switch 33 and is configured to open the pre-actuation valve 29 when the pressure switch 33 is actuated.

The operation when the signal converter 47 controls the opening of the pre-activation valve 29 is basically the same as the case of FIG. The only difference is that the main body is replaced by the signal converter 47 instead of the fire extinguishing system control panel 39 .

In the above embodiment, the pressure sensor 45 is used instead of the pressure switch 33, and the pressure value sampled by the pressure sensor 45 is transmitted to the signal converter 47. The sampled pressure values may be configured to be transmitted to the fire extinguishing system control panel 39 as well.
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 by enabling the administrator to visually recognize the change in the pressure value for a certain period of time, for example, in summer 3, when there is an increase in the pressure in the pipe, the administrator can open the test valve 23 to reduce the pressure in the pipe.
In this embodiment, the fire receiver 43 and the fire extinguishing system control panel 39 are respectively provided.

Furthermore, in the above embodiment, the pressure switch 33 is provided in case the pressure sensor 45 fails. includes controlling the opening of the pre-actuation valve 29 based only on the information of

1 pre-actuated sprinkler fire extinguishing system 3 water tank 5 fire pump 7 water main 9 pressure tank 11 pressure switch (pressure tank)
13 Pump control panel 15 Branch pipe 17 Pre-actuated water flow detector 19 Secondary side piping 21 Sprinkler head 23 Test valve 25 Compressor 27 Air pipe 29 Pre-actuated valve 31 Electric valve 33 Pressure switch (Pre-actuated water flow detector)
35 Running water detection switch 39 Fire extinguishing system control panel 41 Fire sensor 43 Fire receiver 45 Pressure sensor 47 Signal converter 49 Emergency power supply

Claims (3)

A normally closed pre-actuation valve, a secondary-side pipe connected to the secondary side of the pre-actuation valve and filled with compressed gas, a sprinkler head connected to the secondary-side pipe, and the sprinkler head A fire receiver installed in the same protected area to receive a fire signal or sensor output from a fire detector, a pressure sensor to constantly detect the pressure in the secondary side pipe, and a detection signal of the pressure sensor are input. and a signal converter that calculates the rate of change in pressure and transmits a sprinkler activation signal when the calculated value reaches a predetermined value; and inputs of the fire signal from the fire receiver and the sprinkler activation signal of the signal converter. a control panel that opens the pre-actuation valve when
The fire receiver has a function of transmitting a failure signal to the control panel, and when the control panel receives the failure signal, the control panel receives the sprinkler operation signal even if the fire signal is not input. A sprinkler fire extinguishing system characterized by switching to control for opening a pre-activation valve. The pressure change rate calculated by the signal converter is the slope of a regression line obtained by performing linear regression using the least squares method on the relationship between the pressure value obtained at predetermined intervals and the acquisition time. A sprinkler fire extinguishing system according to claim 1. A normally closed pre-actuation valve, a secondary-side pipe connected to the secondary side of the pre-actuation valve and filled with compressed gas, a sprinkler head connected to the secondary-side pipe, and the sprinkler head A fire receiver installed in the same protected area to receive a fire signal or sensor output from a fire detector, a pressure sensor to constantly detect the pressure in the secondary side pipe, and a detection signal of the pressure sensor are input. and a signal converter that calculates the rate of change in pressure and transmits a sprinkler activation signal when the calculated value reaches a predetermined value; and inputs of the fire signal from the fire receiver and the sprinkler activation signal of the signal converter. a control panel that opens the pre-actuation valve when
The sprinkler fire extinguishing equipment, wherein the signal converter has a function of opening the pre-actuation valve instead of the control panel when communication with the control panel becomes impossible.

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