JP7461541B2 - Sprinkler fire extinguishing equipment - Google Patents

Description

The present invention relates to a sprinkler fire extinguishing system, and in particular to a pre-activation sprinkler fire extinguishing system.

Buildings over a certain size are equipped with sprinkler fire extinguishing equipment. Sprinkler fire extinguishing equipment is equipment that extinguishes fires by spraying water from sprinkler heads installed on the ceiling.

A sprinkler fire extinguishing system sprays water when the heat-sensing part of the sprinkler head melts or bursts due to the heat of a fire, but there is also a pre-activation sprinkler fire extinguishing system that is more reliable as a system.

This pre-action sprinkler fire extinguishing system consists of a pre-action valve that is normally closed, secondary piping connected to the secondary side of the pre-action valve and filled with compressed air or the like, a sprinkler head connected to the secondary piping, and a fire detector installed in the same protected area as the sprinkler head.

In this system, when a fire breaks out, the fire detector is activated and the pre-action valve is opened based on the signal from the fire detector. When the sprinkler head is then opened by the heat of the fire, the compressed air in the pipes is discharged and water is sprayed from the sprinkler head. With this system, even if the heat-sensing part of the sprinkler head is damaged by an external force, as long as the fire detector is not activated, there will be no water damage in the protected area and it is highly reliable.

However, in pre-acting sprinkler fire extinguishing equipment, the pre-acting valve opens when the fire detector operates, so if the fire detector is activated due to non-fire, the pre-acting valve opens and the secondary piping Water will flow inside. If water enters the secondary pipe, it will be necessary to drain the water afterwards, but the down pipe to which the sprinkler head is connected cannot be drained, and after a long period of time, The water and compressed air that collects there can corrode the pipes.
Therefore, in Patent Document 1, in a pre-action sprinkler fire extinguishing system, the conditions for opening the pre-action valve include the activation of a fire detector and the pressure in the secondary piping being below a predetermined value. A pressure switch will be activated to detect this.

In this system, when a fire breaks out in the protected area and the sprinkler head opens, the compressed air in the secondary piping is discharged, the pressure in the piping drops, and the pressure switch operates, and if the fire activates the fire detector, the pre-action valve opens. Because the pre-action valve opens under two conditions, this system is also called double interlock control.
In equipment that employs this double interlock control, the pre-action valve will not open even if the fire detector is activated when there is no fire, so water will not flow into the secondary piping. Moreover, this system is superior to conventional sprinkler fire extinguishing equipment in that it is less susceptible to water damage.

Japanese Patent Application Publication No. 62-57569

However, in the case of double interlock control, the pressure switch does not operate unless the pressure drop in the secondary piping drops to a predetermined value, and to prevent malfunction, the pressure during monitoring in the pressure switch and the pressure drop set value are 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 being delayed.

In order to solve such problems, the applicant proposed in a previous application (Patent Application No. 2018-58038) that a pressure sensor is used instead of a pressure switch, and the pressure change rate is calculated by inputting the detection signal of the pressure sensor. It has a signal converter that transmits a sprinkler activation signal when the calculated value reaches a predetermined value, and transmits the fire signal or sensor output from the fire detector to the fire receiver, and transmits the fire signal from the fire receiver. The present invention proposes a sprinkler fire extinguishing system in which the sprinkler activation signal from the signal converter is input to a fire extinguishing system control panel, and a pre-operation valve is opened when these two signals are input.
According to the sprinkler fire extinguishing equipment of this earlier application, a pressure drop can be detected before the pressure in the secondary piping decreases and reaches a predetermined value, and a reduced pressure state can be detected earlier than in conventional systems that use pressure switches. Therefore, it is highly effective in preventing water discharge delays.

However, it is possible that fire receivers and fire extinguishing system control panels may malfunction, and the problem remains as to what measures should be taken in the event that these devices malfunction.

The present invention was made to solve such problems, and aims to provide a sprinkler fire extinguishing system that can respond appropriately without delaying water discharge even if there is a malfunction in the fire receiver or fire extinguishing system control panel.

(1) The sprinkler fire extinguishing equipment according to the present invention includes a normally closed pre-action valve, a secondary pipe connected to the secondary side of the pre-action valve and filled with compressed gas, and the secondary pipe. a sprinkler head connected to the sprinkler head, a fire receiver installed in the same protected area as the sprinkler head and receiving a fire signal or sensor output from the fire detector, and a pressure constantly detecting the pressure in the secondary piping. a sensor, a signal converter that receives a detection signal from the pressure sensor, calculates a pressure change rate, and issues a sprinkler activation signal when the calculated value reaches a predetermined value; and a fire signal from the fire receiver and the fire signal from the fire receiver. and a control panel that opens the pre-operation valve when a sprinkler activation signal from a signal converter is input,
The fire receiver has a function of transmitting a fault signal to the control panel, and when the control panel receives the fault signal, the fire receiver transmits the fault signal to the control panel when the sprinkler operation signal is input even if the fire signal is not input. It is characterized by switching to control to open the pre-operation valve and notifying the signal converter of the failure signal, and upon receiving the notification, the signal converter changes the conditions for transmitting the sprinkler activation signal to more severe conditions. That is.

(2) In addition, in the above (1), the pressure change rate calculated by the signal converter is the slope of a regression line obtained by linear regression using the least squares method on the relationship between the pressure value acquired at each predetermined time and the acquisition time, and the stricter condition is characterized by increasing the threshold value of the slope at which the sprinkler activation signal is transmitted or increasing the number of data items to be linearly regressed.

(3) Furthermore, the sprinkler fire extinguishing system of the present invention comprises a pre-action valve that is normally closed, a secondary piping connected to the secondary side of the pre-action valve and filled with compressed gas, a sprinkler head connected to the secondary piping, a fire receiver installed in the same protected area as the sprinkler head and receiving a fire signal or a sensor output from a fire detector, a pressure sensor that constantly detects the pressure in the secondary piping, a signal converter that inputs the detection signal from the pressure sensor to calculate the rate of pressure change and transmits a sprinkler activation signal when the calculated value reaches a predetermined value, and a control panel that opens the pre-action valve when a fire signal from the fire receiver and a sprinkler activation signal from the signal converter are input.
The signal converter has a function of opening the pre-action valve in place of the control panel when communication with the control panel is disabled, and is characterized in that when communication with the control panel is disabled, the pre-action valve is opened under stricter conditions than the conditions for transmitting a sprinkler operation signal when communication with the control panel is established.

The sprinkler fire extinguishing system of the present invention comprises a pressure sensor that constantly detects the pressure in the secondary piping, a signal converter that receives the detection signal from the pressure sensor to calculate the rate of pressure change and transmits a sprinkler activation signal when the calculated value reaches a predetermined value, and a control panel that opens the pre-action valve when a fire signal from the fire receiver and a sprinkler activation signal from the signal converter are input, so that a drop in pressure in the secondary piping can be detected before the pressure in the secondary piping decreases and reaches a predetermined value. Therefore, a reduced pressure state can be detected earlier than in the conventional example that uses a pressure switch, which is highly effective in preventing delays in water discharge.
In addition, the fire receiver has a function of transmitting a fault signal to the control panel, and when the control panel receives the fault signal, it switches to a control that opens the pre-action valve when the sprinkler activation signal is input even if the fire signal is not input, and notifies the signal converter of the fault signal, and when the signal converter receives the notification, it changes the conditions for transmitting the sprinkler activation signal to stricter conditions.Therefore, even if there is a fault in the fire receiver, appropriate action can be taken without delays in water discharge.

1 is an explanatory diagram of an overall configuration of a sprinkler fire extinguishing system according to an embodiment of the present invention; FIG. 2 is an explanatory diagram of main parts of the sprinkler fire extinguishing equipment shown in FIG. 1. FIG. FIG. 2 is an explanatory diagram (part 1) of a determination method based on a pressure change rate in a signal converter of the sprinkler fire extinguishing system shown in FIG. 1 . FIG. 2 is an explanatory diagram (part 2) of a determination method based on a pressure change rate in a signal converter of the sprinkler fire extinguishing system shown in FIG. 1 . FIG. 2 is an explanatory diagram (part 1) for explaining the effect of a determination method based on a pressure change rate in a signal converter of the sprinkler fire extinguishing system shown in FIG. 1 . FIG. 2 is an explanatory diagram (part 2) for explaining the effect of the determination method based on the pressure change rate in the signal converter of the sprinkler fire extinguishing system shown in FIG. 1 . FIG. 1 is an explanatory diagram illustrating the function of the signal converter when the fire control receiver fails (part 1). It is an explanatory diagram explaining the function of a signal converter when a fire receiver breaks down (part 2). It is an explanatory diagram explaining the function of a signal converter when a fire receiver breaks down (part 3). 2 is a flowchart showing an operation of the sprinkler fire extinguishing system shown in FIG. 1 in the event of a fire. FIG. 2 is an explanatory diagram illustrating a state in which a fire receiver of the sprinkler fire extinguishing system shown in FIG. 1 has failed. 2 is a flowchart of an operation in the event of a fire when a fire receiver of the sprinkler fire extinguishing system shown in FIG. 1 breaks down. FIG. 2 is an explanatory diagram illustrating a 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 equipment targeted by this embodiment is a pre-activation sprinkler fire extinguishing equipment, its outline including the equipment configuration provided in the conventional example will be explained based on FIG. 1.
As shown in FIG. 1, the pre-acting sprinkler fire extinguishing equipment 1 includes a water storage tank 3 for storing fire extinguishing water in the basement floor of a building, and the fire extinguishing water in the water tank 3 is supplied to a water supply main 7 by a fire pump 5. Ru. A pressure tank 9 used for starting the fire pump 5 is connected to the water main 7, and pressure water from the water main 7 is introduced into the pressure tank 9, which is configured to 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, this pressure reduction signal is output to the pump control panel 13, and the fire pump 5 is configured to start. There is.

A branch pipe 15 is drawn from the main water supply pipe 7 for each protection area, and a pre-activation water flow detection device 17 is provided on the branch pipe 15. A closed sprinkler head 21 is attached to the secondary side of the pre-activation water flow detection device 17 on the branch pipe 15, i.e., to the secondary side piping 19, and a test valve 23 is provided at the end of the secondary side piping 19. Compressed air (corresponding to compressed gas in the claims) pressurized to a predetermined pressure by a compressor 25 is supplied to the secondary side piping 19 via an air piping 27.
The pre-action type water flow detection device 17 includes a pre-action valve 29, an electric valve 31 that opens the pre-action valve 29, a pressure switch 33 that detects reduced pressure, and a water flow detection switch 35.
A pressure sensor 45 that constantly detects the internal pressure is provided in the secondary side pipe 19. The pressure sensor 45 constantly samples the pressure value in the pipe at extremely short time intervals (for example, every 10 ms) and outputs the sampled value to a signal converter 47, which will be described later.

The pressure sensor 45, the motor-operated valve 31, the pressure switch 33, and the 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 from the pressure sensor 45, calculating the rate of change of pressure, and when the calculated value reaches a predetermined value, transmitting a sprinkler activation signal, which is a signal for activating the sprinkler.

Further, the signal converter 47 is provided with an emergency power supply device 49, and power is constantly supplied to the signal converter 47 and the pressure sensor 45 from the emergency power supply device 49. Therefore, even if a fire occurs and a power outage occurs, the signal converter 47 can correctly transmit the sprinkler activation signal.
Since one signal converter 47 is provided corresponding to one pre-activated water flow detection device 17, there are a plurality of signal converters 47 in one building, but these plural signal converters 47 is connected to a fire extinguishing system control panel 39 serving as a control panel of the present invention to enable signal transmission.

A fire detector 41 is installed in the protected area where the sprinkler heads 21 are installed, and when the fire detector 41 determines that there is a fire, a fire signal is input to a fire receiver 43, which in turn inputs a fire signal to the fire extinguishing 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 if the fire receiver 43 itself or the fire detector 41 fails (see FIG. 2).
In the above, the fire detector 41 judges that there is a fire, but if the fire detector 41 is an analog type, the sensor output from the fire detector 41 is input to the fire receiver 43, and the fire receiver 43 compares the sensor output with a predetermined value to judge whether there is a fire or not. When the fire receiver 43 judges that there is a fire, a fire signal based on the judgment is input to the fire extinguishing system control panel 39.

The fire extinguishing system control panel 39 controls the electric valve 31 when a fire signal from the fire receiver 43 and either a sprinkler operation signal from the signal converter 47 or a signal from the pressure switch 33 are input. , and is configured to open the pre-operation valve 29.
Furthermore, when a fault signal is input from the fire receiver 43, the fire extinguishing system control panel 39 notifies the signal converter 47 of the fault signal (see FIG. 2), and thereafter no fire signal is input. However, when either a sprinkler activation signal or a signal from the pressure switch 33 is input, the electric valve 31 is controlled to open the pre-operation valve 29.

The transmission of signals between the signal converter 47 and the fire extinguishing system control board 39 is a so-called polling method, in which the fire extinguishing system control board 39 makes a call to the signal converter 47, and the signal converter 47 checks the status. Generally, a notification method is adopted.
However, in the case of this method, if a plurality of signal converters 47 are connected to the fire extinguishing system control panel 39, the fire extinguishing system control panel 39 calls out sequentially from the first signal converter 47. Since there is a time lag between the time when the sprinkler operation signal is ready to be transmitted and the time when the sprinkler operation signal is actually transmitted, there is a problem in that it takes time until the information is transmitted to the fire extinguishing system control panel 39.
Therefore, if the signal converter 47 and the fire extinguishing system control panel 39 are connected via a dedicated line and the signal converter 47 sends out a sprinkler activation signal, the signal converter 47 can be activated immediately without waiting for a call from the fire extinguishing system control panel 39. Preferably, the signal is sent to the fire suppression system control board 39. By doing so, it is possible to shorten the time from when the signal converter 47 transmits the sprinkler activation signal to when water is discharged.

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

<About the first function>
In this embodiment, as a method for determining the rate of pressure change calculated by the signal converter 47, the relationship between the pressure values acquired at predetermined time intervals and the acquisition time is calculated by linear regression using the least squares method. I try to find it as a slope.
Specifically, as shown in Figure 3, pressure value sampling data is acquired every 10 msec, and for example, for 199 pieces of data (≒2 seconds), the vertical axis Y is plotted as pressure, as shown in Figure 4. In a graph where the horizontal axis X is time, calculate the slope of the regression line by linear regression using the least squares method.
Note that since FIG. 4 is a schematic diagram, only four pieces of sampling data are shown, but in reality, linear regression is performed using about 200 pieces of data as described above. However, as the number of data increases, the influence of electrical noise decreases and accuracy improves, but linear regression takes time, so it is preferable to set the number of data to about 200 to 400, for example.
Expressing this in a formula is as follows.
Slope = XY covariance / X variance However, XY covariance = (xi * yi) average - (xi average * yi average)
X variance = total ((xi mean - xi)^2)
i=1～199

As shown in Figure 3, the slope is calculated at predetermined intervals (in the example in Figure 3, 10 msec x 20 = 200 msec = 0.2 seconds) 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 Figure 3,
(i) Calculate the slope using the "least squares method" using data from n1 to n199 and compare it with the threshold value to determine
(ii) Calculate the slope using the "least squares method" using data from n21 to n219 and compare it with the threshold value to determine
(iii) Calculate the slope using the "least squares method" with data from n41 to n239 and compare it with the threshold value to determine
(iv)n61～...(hereinafter omitted)...
When the slope value exceeds the threshold value, the signal converter 47 outputs a sprinkler activation signal to the fire suppression system control panel 39.

The effect of obtaining the rate of pressure change as described above will be described with reference to FIGS.
Figure 5 is a graph showing pressure changes based on sampling data output from 199 pressure sensors every 10 ms (≒ 2 seconds) in a monitoring state where there is almost no actual pressure change. The vertical axis shows pressure (kPa) and the horizontal axis shows 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 an actual pressure change, but is a change caused by electrical noise.
When calculating the rate of pressure change based on sampling data that is affected by such electrical noise, for example, if the slope is calculated from only the first and last values in a given time interval and illustrated, it will be a straight line with a constant slope, as shown by the dashed dotted line in Figure 5. Having a constant slope indicates that the pressure is changing, which means that there is a pressure change even though there is no actual pressure change.

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

FIG. 6 is a graph showing changes in pressure values based on sampling data when the sprinkler head is activated, and the graph includes a straight line based on the least squares method.
The slope of the straight line is approximately -1.557 kPa/sec, as shown in the figure, which accurately represents the rate of pressure change when the sprinkler operates.

As described above, by virtue of the signal converter 47 having the first function, the pressure value in the piping is constantly sampled at extremely short time intervals, and the signal converter 47 constantly calculates the rate of change of pressure by inputting this sampling signal, so that a pressure drop can be detected before the pressure in the secondary piping 19 decreases and reaches a predetermined value. Therefore, compared to the conventional example using only a pressure switch, a reduced pressure state can be detected very early, which is highly effective in preventing a delay in water discharge.
Moreover, in this embodiment, the pressure change rate is calculated using the least squares method, so that the influence of electrical noise can be reduced as much as possible.

In the present invention, the calculation of the pressure change rate by the signal converter 47 is not limited to the above method, and may be performed as follows, for example.
The signal converter 47 periodically samples the output value of the pressure sensor 45, and for example, each time it samples, it calculates the difference between the currently sampled output value and the previous output value, and determines whether the pressure is on a decreasing trend. . If the pressure decreases continuously several times and the pressure decreases by a predetermined value or more, the signal converter 47 outputs a sprinkler activation signal to the fire extinguishing system control panel 39.
Note that if the pressure at which the pressure switch 33 operates is A, and the pressure in the secondary pipe 19 during normal times, that is, the monitored state, is B, the pressure is higher than pressure C, which is the intermediate value between pressure A and pressure B. By outputting the sprinkler activation signal when there is a certain tendency for the pressure to decrease, a decrease in pressure in the secondary pipe 19 can be detected at an early stage.

<About the second function>
As described above, the second function is a function that, when a failure signal is received that is emitted in the event of a failure of the fire receiver 43, changes the algorithm for transmitting a sprinkler activation signal to stricter conditions (an algorithm for transmitting a sprinkler activation signal under conditions that are determined to be more certain that there is a fire) and transmits a sprinkler activation signal based on the changed algorithm.
The case where the function of transmitting the sprinkler operation signal under normal conditions is based on the above-mentioned least squares method will be described with reference to Figs.
Fig. 7 is a graph showing pressure changes based on sampling data acquired every 10 ms by pressure sensor 45. Figs. 8 and 9 are graphs showing time changes in the slope of the regression line calculated by the least squares method based on the data in Fig. 7, with the vertical axis showing the slope and the horizontal axis showing the time. Fig. 8 shows a case where the slope was calculated based on 100 pieces of data acquired every 10 ms, and Fig. 9 shows a case where the slope was calculated based on 200 pieces of data acquired every 10 ms.

Comparing the graphs in Figures 8 and 9, it can be seen that Figure 9 has less variation in the data and a gentler slope. The smaller variation in the data indicates improved accuracy. Furthermore, because the slope is gentler, if a sprinkler activation signal is to be sent when the slope reaches or exceeds a predetermined value, a situation may arise in which the sprinkler activation signal is sent in the case of Figure 8 but not in the case of Figure 9. Therefore, it can be said that Figure 9 has stricter conditions for the algorithm for sending a sprinkler activation signal, i.e., Figure 9 is an algorithm that sends a sprinkler activation signal when conditions are such that it is more certain that there is a fire.

A more stringent condition would be to slightly increase the slope of the regression line at which the sprinkler activation signal is sent, to eliminate the effects of variation.

Next, the operation of the pre-action sprinkler fire extinguishing system 1 of this 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 piping 19, and the signal converter 47 calculates the rate of change of the pressure. However, unless the calculated rate of change of the pressure exceeds a preset value, the signal converter 47 does not transmit a sprinkler activation signal to the fire extinguishing system control panel 39.

<Operation in case of fire>
In the event of a fire, the fire detector 41 is normally activated first (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).
Note that here, a case will be described in which the fire detector 41 itself determines whether there is a fire. That is, when the output value detected by the fire detector 41 exceeds a predetermined value and it is determined that there is a fire, the fire detector 41 transmits a fire signal to the fire receiver 43. Note that, as described above, the present invention is applicable even when the fire receiver 43 determines whether there is a fire. In this case, the sensor output from the fire detector 41 is transmitted 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 on fire. In either case, if 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 opens due to the heat of the fire and the pressure in the secondary pipe 19 is reduced (S3), the pressure change rate, which is the calculated value of the signal converter 47, exceeds a predetermined value, so the signal is converted. 47 sends a sprinkler activation signal to the fire extinguishing system control panel 39 (S4).

As described above, the pressure sensor 45 constantly samples the pressure value in the pipe at very short time intervals, and the signal converter 47 inputs this sampling signal to constantly calculate the rate of change of pressure, so that a pressure drop can be detected before the pressure in the secondary pipe 19 decreases and reaches a predetermined value, and a reduced pressure state can be detected very early after the sprinkler head 21 opens.

When the fire extinguishing system control panel 39 receives both the fire signal and the sprinkler activation signal, it controls the electric valve 31 to open the pre-operation valve 29 (S5). When the pre-operation valve 29 opens, water continues to flow from the main water supply pipe 7, the water flow is detected, the flowing water detection switch 35 is activated, and a flowing water signal is sent to the fire extinguishing system control panel 39. Send (S6). When the fire extinguishing system control panel 39 receives the running water signal (S7), the running water signal is also transmitted from the fire extinguishing system control panel 39 to the fire receiver 43 (S8).
Further, when the pre-actuation valve 29 opens, a pressure drop occurs in the primary side piping of the pre-actuation valve 29 in the branch pipe 15, and as a result, the pressure switch 11 provided in the pressure tank 9 is activated, and the pump control panel 13 is activated. Start the fire pump 5.
When the fire pump 5 is activated, pressurized fire extinguishing water is supplied to the secondary pipe 19 through the main water supply pipe 7 and is 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 due to non-fire, a fire signal is input to the fire extinguishing system control panel 39, but a sprinkler activation signal is not input. Therefore, the fire extinguishing system control panel 39 does not open the pre-operation valve 29. Therefore, fire extinguishing water is not supplied to the secondary side piping 19, and water draining work does not occur.

<If the pressure sensor is broken>
If the pressure sensor 45 fails, it may happen that the sprinkler activation signal is not sent even if there is a fire. However, when the sprinkler head 21 opens, the pressure in the secondary piping 19 is reduced, and when the pressure in the secondary piping 19 is reduced to a predetermined value, the pressure switch 33 is activated and the signal of the pressure switch 33 is input to the fire extinguishing system control panel 39 via the signal converter 47.
In the event of a fire, a fire signal is input to the fire extinguishing system control panel 39, so when the fire extinguishing system control panel 39 receives a signal from the pressure switch 33, it opens the pre-action valve 29 even if a sprinkler operation signal is not input from the signal converter 47.

In this way, in this embodiment, even if the pressure sensor 45 fails, the worst case scenario of water not being discharged during a fire can be reliably avoided, making the fire extinguishing system highly reliable.

<If the fire detector or fire receiver malfunctions>
When the fire detector 41 or the 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 a fault signal, it sends the fault signal to the signal converter 47, and thereafter, even if there is no fire signal input, either the signal from the signal converter 47 or the signal from the pressure switch 33 is transmitted. When this signal is input, the electric valve 31 is controlled to open the pre-operation valve 29.

When the signal converter 47 receives a fault signal from the fire extinguishing system control panel 39, it uses the second function described above to determine whether or not to transmit a sprinkler activation signal under stricter conditions.

The operation when the fire detector 41 or the fire receiver 43 fails will be explained based on FIGS. 11 and 12.
When the fire detector 41 or the fire receiver 43 malfunctions, the fire receiver 43 transmits a malfunction signal to the fire extinguishing system control panel 39 (S11). Upon receiving this signal, the fire extinguishing system control panel 39 switches to an independent mode in which the pre-operation valve 29 is opened if there is a pressure drop in the secondary pipe 19 even if there is no fire signal (S12).

In this state, when a fire occurs and the sprinkler head 21 is activated (S13), the pressure change rate, which is the calculated value of the signal converter 47, exceeds a predetermined value, so the signal converter 47 is activated by the fire extinguishing system control panel 39. A sprinkler activation signal is transmitted (S14). Even if there is no input of a fire signal, the fire extinguishing system control panel 39 controls the electric valve 31 to open the pre-operation valve 29 when the sprinkler activation signal is input (S15). When the pre-operation valve 29 opens, the water flow detection switch 35 is activated and a water flow signal is sent 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-operation valve 29 is opened, the same operation as explained in FIG. 10 is performed to extinguish the fire (S18).

In this way, when the fire detector 41 or the fire receiver 43 is out of order, the pre-operation valve 29 can be operated by the independent operation of the fire extinguishing system control panel 39, so that the fire detector 41 or the fire receiver 43 can be operated. 43 is out of order, it is possible to reliably avoid the worst case where water is not sprayed in the event of a fire, and the reliability of the fire extinguishing equipment is high.
Furthermore, 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 embodiment 1, the case was a case in which the fire detector 41 or the fire receiver 43 failed, but it is also possible that the fire extinguishing system control panel 39 failed. This embodiment relates to a sprinkler fire extinguishing system that takes measures in the case in which the fire extinguishing system control panel 39 fails.

The difference between the sprinkler fire extinguishing equipment of this embodiment and that of Embodiment 1 is regarding the function of the signal converter 47. As shown in FIG. When communication becomes impossible, the electric valve 31 is controlled in place of the fire extinguishing system control panel 39 to open the pre-operation valve 29.

Moreover, the conditions for the signal converter 47 to open the pre-operation 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.
Note that the signal converter 47 also obtains information from the pressure switch 33 and is configured to open the pre-operation valve 29 when the pressure switch 33 is activated.

The operation when the signal converter 47 controls the opening of the pre-operation valve 29 is basically the same as that shown in FIG. 12, which shows the operation when the fire detector 41 or fire receiver 43 fails, and The only difference is that the main body is a signal converter 47 instead of the fire extinguishing system control panel 39.

In the above embodiment, a 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. However, for example, the pressure value sampled from the pressure sensor 45 may also be configured to be transmitted to the fire extinguishing system control panel 39.
In this case, the fire extinguishing system control panel has a display unit that can directly display the pressure value in the secondary piping, allowing the manager to visually check the change in pressure value over a certain period of time. For example, in the summer, when there is an increase in pressure in the piping, the manager can reduce the pressure in the piping by opening the test valve 23.
In this embodiment, the fire receiver 43 and the fire extinguishing system control panel 39 are provided separately, but the functions of these panels may be integrated into one integrated panel.

Further, in the above embodiment, the pressure switch 33 is provided in case the pressure sensor 45 fails, but the pressure switch 33 is not essential in the present invention, and the present invention This includes one in which the opening of the pre-operation valve 29 is controlled based only on the information.

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

Claims (2)

a pre-action valve that is normally closed, a secondary piping connected to the secondary side of the pre-action valve and filled with compressed gas, a sprinkler head connected to the secondary piping, a fire receiver provided in the same protected area as the sprinkler head and receiving a fire signal or a sensor output from a fire detector, a pressure sensor that constantly detects the pressure in the secondary piping, a signal converter that receives the detection signal from the pressure sensor to calculate a pressure change rate and transmits a sprinkler operation signal when the calculated value reaches a predetermined value, and a control panel that opens the pre-action valve when the fire signal from the fire receiver and the sprinkler operation signal from the signal converter are input,
A sprinkler fire extinguishing system characterized in that the control panel inputs the pressure value sampled by the pressure sensor and has a display unit that displays the input pressure value . A claim characterized in that the rate of pressure change calculated by the signal converter is the slope of a regression line obtained by performing linear regression using the method of least squares with respect to the relationship between the pressure values acquired at predetermined time intervals and the acquisition time. Sprinkler fire extinguishing equipment according to item 1.

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