JPS627338Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fire extinguishing system having a function of displaying the operational status of sprinkler heads and detecting the spread status and speed of fire within a caution area.

Conventional fire extinguishing systems divide the entire fire extinguishing area into one or more warning zones, and each warning zone has a plurality of sprinklers that are normally closed by a heat-sensitive member and are opened by the thermal response of the heat-sensitive member due to the heat of the fire. The sprinkler head is configured to extinguish the fire by sprinkling water stored in a water tank from the opened sprinkler head via pressurizing means.

In addition, fire extinguishing systems are often equipped with a fire alarm system, and when a sprinkler head is activated due to a fire, a district alarm signal is sent to the disaster prevention center or control room for the area to which the activated sprinkler head belongs. It is reported that a fire has broken out in the warning area.

However, it was not possible to report information about the scale of the fire, such as how far the fire had spread within the alert area or how fast the fire was spreading.

On the other hand, when a fire occurs, it is desired to know information such as the scale of the fire and the speed of its spread.

Therefore, as a method to meet the above-mentioned demand, it has been considered to detect the number of activated sprinkler heads by detecting the open/closed state of each sprinkler head of the fire extinguishing system and emitting a detection signal.

However, when using this method, the number of detection points is extremely large, and the number of detection signal lines is enormous.In addition, it is difficult to maintain waterproofing and insulation of the signal lines at the detection point of the sprinkler head, and it is difficult to maintain the waterproofness and insulation of the signal lines at the detection point of the sprinkler head. There are various problems that need to be solved, such as the connection not being disconnected even when a shock is applied, and it must also be possible to send a test signal to a disaster prevention center or the like.

Another possible method is to detect the water supply pressure in the water supply pipes to the sprinkler heads in each warning area, but when using this method, even if the water supply pressure is controlled, the water supply pressure will always fluctuate within a predetermined range. However, there are problems such as the inability to detect when a small number of sprinkler heads are activated.

The present invention has been made in consideration of the above, and aims to provide a fire extinguishing system that can solve each of the above problems and obtain information such as the scale of a fire with a simple configuration. The purpose of this is to provide a fire extinguishing system according to the present invention, which includes a water supply flow rate detector that detects the water supply flow rate to each warning area, and the operating status of the operating sprinkler head in the warning area from the output of the water supply flow rate detector. This is achieved by comprising a determination device and a display device that displays the name or symbol of a warning area in association with the operating status of the sprinkler head in the warning area.

The present invention will be explained below with reference to examples.

FIG. 1 is a system diagram of an embodiment of the present invention.

1 ₁ ,...1 _o ,2 ₁ ,...2 _n ,3 ₁ ,...
...3 _k is a sprinkler head whose valve is closed by a heat-sensitive member, such as solder that melts at a predetermined temperature or a bimetal that reverses, and whose valve is opened in response to the heat generated during a fire, and 4 is a sprinkler head. 1 ₁ ,……3
This is a constant pressure constant flow valve that sprays water at a constant pressure and constant flow rate from the sprinkler head when the valve _k is open.

Now, the area in charge of the fire extinguishing system is divided into one or more warning areas, and the first warning area is connected to the first water supply pipe 5 with sprinkler heads 1 ₁ , ... 1 _o , respectively, through constant pressure constant flow valves 4 . Sprinkler heads 2 1 , _{2 n} are connected to the second water supply pipe 6 in the second warning area.
are provided through constant pressure and constant flow valves 4 to share fire extinguishing in the second warning area, and similarly, a sprinkler head ₃₁ ... _3k is connected to the third water supply pipe 7 in the third warning area. Each of them is provided via a constant pressure constant flow valve 4, and is arranged so that extinguishing the fire in the third warning area is shared. The division of fire extinguishing in restricted areas will be determined as appropriate depending on the height and size of the building. The water in the water tank 9 is pressurized by a pump 8 as a pressurizing means, and each water supply pipe 5,
A fire extinguishing system is constructed in which _water is supplied to each of the sprinkler heads 1 ₁ , .

In the present invention, the fire extinguisher is further provided with a water supply flow rate detector 1 for detecting the amount of water supplied to each warning area.
0, 11, 12 as the first, second and third respectively
Provided separately for each water supply pipe.

On the other hand, 14 and 13 are a microcomputer as a judgment device and an input interface circuit, and 15 is a display interface consisting of a video RAM equipped with a readable and writable memory, a character generator, and a synchronization signal generation circuit. 16 is a CRT display device, which includes a microcomputer 14, interface circuits 13 and 15, a CRT display device, and water supply flow rate detectors 10, 11, 12.
The water supply flow rate signal from each water supply flow rate detector 10, 11, 12 is scanned and read at a predetermined period, and the water supply flow rate signal from each water supply flow rate detector 10, 11, 12 is converted into a flow rate value, and the pre-stored water supply flow rate signal per unit time of one sprinkler head is calculated. The number of calculated activated sprinkler heads is determined by dividing by the amount of water sprinkled, and as is done with conventional computing loggers, the calculated number of activated sprinkler heads corresponding to each warning area and the name of the warning area or the assignment to the warning area are calculated. The CRT display device 16 is configured to display symbols or characters indicating the warning area in correspondence with each other. Further, the microcomputer 14 is configured so that when a water supply flow rate value other than zero is read, scanning of the next water supply flow rate value is delayed by a predetermined period of time. During this predetermined period of time, the water supply flow rate detectors in areas other than the warning zone to which the activated sprinkler head belongs when the fire extinguishing system is activated may malfunction due to water hammer action, making it appear as if the water supply flow rate is zero even though the water supply flow rate is zero. This is to avoid detection of the water supply flow rate due to this malfunction.

The operation of the fire extinguishing system configured as described above will be explained using, for example, a case where a fire breaks out in the first warning area.

Now, if a fire breaks out in the first warning area, the number of heat-sensitive members of the sprinkler heads corresponding to the location and area of the fire among the sprinkler heads 1 ₁ , ... 1 _o will be sensitive, and The sprinkler head opens and sprinkles water. Therefore, the water supply flow rate detector 10 generates a flow rate detection signal that is several times as large as the number of sprinkles per unit time of one sprinkler head. This water supply flow rate detector 1
The flow rate detection signal of 0 is read into the microcomputer 14 through the interface circuit 13, and is divided by the amount of scattering per unit time of one sprinkler head. As a result, the number of sprinkler heads that are open is calculated, and a signal indicating the calculated number of open sprinkler heads is input to the interface circuit 15 together with a signal corresponding to the symbol assigned to the first warning area. hand
Added synchronization signal for CRT display
At a predetermined position of the CRT display device 15,
The symbol indicating the warning area and the calculated number of open sprinkler heads as the number of open sprinkler heads in the first warning area are displayed in correspondence.

In addition, since the water supply flow rate detector 10 in the first caution area detected a large amount of water supply flow rate, the subsequent scanning of the water supply flow rate detectors 11 and 12 was delayed by a predetermined period of time to avoid the influence of the water hammer effect, as described above. is read.

In addition, if the effect of water hammer action is slight and the effect on the water supply flow rate detector is less than the amount corresponding to the amount of water sprinkled by one sprinkler head, the delayed scanning function that reads after the predetermined time described above can be removed. It's okay to do that.

In addition, when no fire occurs in any warning area other than the first warning area, the water supply flow rate detectors 11 and 12 in the warning area where no fire occurs do not output flow rate signals, so the symbol indicating the warning area is not used. A corresponding zero is displayed.

Therefore, it can be seen that a fire of a size corresponding to the calculated number of activated sprinkler heads displayed in the first warning area has occurred.

In addition, the effects when a fire occurs in the second, kth, etc. warning areas, and the effects when a fire breaks out in two or more warning areas are the same as in the above case, so the details are also explained. Further explanation will be omitted.

In addition to the above-mentioned symbol to indicate the restricted area and the calculated number of activated sprinkler heads in the restricted area, the ratio of the calculated number of activated sprinkler heads from the previous scan to the calculated number of activated sprinkler heads from the current scan is also included. It can also be easily displayed in correspondence with a symbol for indicating a caution area. This ratio serves as an index indicating the speed of fire spread, and the speed of fire spread can also be estimated from the ratio.

In addition, the water supply flow rate detector 10 in the above description,
11 and 12 may be ordinary flow rate detectors that detect flow rate, but water supply flow rate detectors 10, 11, 12
If the micropin computer 14 is to be output as an analog signal, a micropin computer 14 equipped with an analog-to-digital converter may be used. Further, if the water supply flow rate detectors 10, 11, and 12 output a pulse number proportional to the instantaneous flow rate, a counter for counting the number of pulses per unit time may be provided.

FIG. 2 shows an example of a water supply flow rate detector that generates an output in pulse numbers.

The water supply flow rate detector shown in FIG. 2a is an example in which the Wiegand effect is used.

In FIG. 2, reference numeral 21 denotes a water wheel rotatably installed in the water supply pipe 10. A cylindrical body 22 made of a non-magnetic material is fixed to the shaft of the water wheel 21, and Wiegand's wires are placed at equal intervals on the surface of the cylindrical body 22. A wire 23 is fixed.

On the other hand, permanent magnets 2 are magnetized in opposite directions, facing two adjacent Wiegand wires.
4 and 25, one permanent magnet, for example 25
A pick-up coil 28 is provided adjacent to.

The Wiegand wire 23 is made of an alloy of vanadium and cobalt, and is heat-treated to give a predetermined strain.
It consists of a softer inner core 27 installed inside. Now, when the hard shell 26 and the softer inner core 27 are magnetized in the same direction by a strong magnetic field as shown in FIG. 2b, and then magnetized by a weak magnetic field in the opposite direction, the softer inner core 27 is magnetized as shown in FIG. 2c. Only the inner core 27 has its magnetization direction reversed. Subsequently, when magnetization is performed using a strong magnetic field in the same direction as the magnetization shown in FIG. 2b, when the magnetizing force exceeds a certain threshold, the direction of magnetization of the softer inner core 27 changes as shown in FIG. Flip in the direction shown in a. At this time, if the pickup coil 28 is provided near the Wiegand wire 23, a sharp pulse output of several volts to +several volts can be obtained from the pickup coil 28. This is the Wiegand effect.

Therefore, returning to FIG. 2a, as the water supply flows into the water supply pipe 10, the water wheel 21 rotates at a rotational speed according to the flow rate of the water supply. So Wiegand Wire 23
is alternately magnetized by the permanent magnets 24 and 25, and the above-mentioned Wiegand effect produces a sharp pulse output in the pickup coil 28 in a number proportional to the instantaneous flow rate of the water supply.

If a flow rate detector using this Wiegand effect is used as the water supply flow rate detectors 10, 11, 12, there is no need to apply power to the water supply flow rate detectors 10, 11, 12, and the output pulse voltage value is high and S/
N is also good, making it optimal for the fire extinguishing system of the present application. However, as mentioned above, it is of course possible to use a commonly used flow rate detector.

Furthermore, in the embodiment of the present invention described above, a constant pressure constant flow valve 4 is provided independently between the sprinkler head 1 ₁ , 3 _k and each water supply pipe 5 , 6 , 7 . As explained in , for example, an annular flow control valve made of an elastic material such as rubber having a through hole between the inlet and the outlet of a sprinkler head is known from Publication of Utility Model Publication No. 152297/1983. A sprinkler head may be used.
In this case, even if the water supply pressure to the sprinkler head fluctuates while the sprinkler head is in operation, the elastic body bends in response to the pressure fluctuation, and its perforation area changes according to the water supply pressure, allowing the sprinkler head to flow through the sprinkler head. The pressure and flow rate of water sprinkled from the head can be made constant pressure and constant flow rate, and the sprinkler heads 1 ₁ , 3 in the case of the embodiment of the present invention described above
The same effect as when _k and the constant pressure constant flow valve 4 are used independently is performed.

Next, an example of application of the above-mentioned embodiment of the present invention will be described.

This application example is a fire extinguishing system according to an embodiment of the present invention shown in FIG. 1, in which the rotational speed of the pump 8 is configured to be switchable in a plurality of stages, for example, three stages, by an external signal. Further, the microcomputer 14 totals the calculated number of active sprinkler heads for each warning area calculated in the above-mentioned embodiment, and divides this total calculated number of active sprinkler heads into the number of switching stages of the rotation speed of the pump 8 according to the numerical value. This output is passed through an interface circuit 17 to switch and control the rotational speed of the pump 8.

Therefore, the calculated number of activated sprinkler heads in all warning areas increases, and each time the above classification changes, pump 8
The number of rotations of the sprinkler head increases in stages, and the amount of water supplied increases in proportion to the number of activated sprinkler heads.

Therefore, the operation of the pump 8 can be made more efficient.

Also, when the pump 8 is configured with multiple pumps,
It is also possible to configure the number of pumps to be operated to increase as the load increases, which also has the effect of improving the efficiency of the pump 8 as a whole and saving energy.

As explained above, according to the present invention, the water supply flow rate to the sprinkler head in each caution area is detected,
Calculate the number of operating sprinkler heads based on the amount of water sprinkled per unit time by one sprinkler head,
The operating status of the sprinkler head is determined by calculating the increase ratio of the operating sprinkler head, and is displayed in accordance with the warning area.Since the sprinkler head is installed in each predetermined area, it is possible to prevent fires in the event of a fire. The area and rate of spread of the fire can be determined. Therefore, extremely useful information for firefighting activities can be obtained.

Furthermore, compared to the case where the valve opening signal of each sprinkler head is detected individually, the number of signal lines for detection can be reduced, and the difficulty of maintaining insulation of the detection signal lines is also eliminated.

Furthermore, compared to the case where the water supply pressure in the water supply pipe to the sprinkler heads is detected, there is an effect that the number of operating sprinkler heads can be determined more reliably even when the number of operating sprinkler heads is small.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention. FIG. 2 is an explanatory diagram of an example of a water supply flow rate detector used in an embodiment of the present invention. 1 ₁ , ...1 _o , 2 ₁ , ...2 _n , 3 ₁ , ...3
_k ...Sprinkler head, 4...Constant pressure constant flow valve, 5, 6 and 7...Water pipe, 8...Pump,
9...Water tank, 10, 11 and 12...Water supply flow rate detector, 13, 15 and 17...Interface circuit, 14...Microcomputer, 16
...CRT display device.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The entire fire extinguishing area is divided into one or more warning zones, and each warning zone has a valve that is always closed by a heat-sensitive member and opened by the thermal response of the heat-sensitive member due to the heat of the fire. In a fire extinguishing system configured to extinguish a fire by sprinkling water supplied from the opened sprinkler heads via a pressurizing means, the sprinkler heads are configured to spray water at a constant pressure and at a constant flow rate. For this purpose, a constant pressure constant flow valve is installed in each sprinkler head or on the water supply inlet side of each sprinkler head, a water supply flow rate detector detects the water supply flow rate to each warning area, and a water supply flow rate detector that detects the water supply flow rate per unit time from one sprinkler head Judgment means for determining the operating status of the sprinkler head in each warning area from the output of the water supply flow rate detector based on the amount of water sprinkled;
A fire extinguishing system characterized by comprising display means for displaying a name of a caution area or its symbol in association with a determination result for the caution area from the determination device. (2) The fire extinguishing system according to claim 1, wherein the operating status of the sprinkler heads determined by the determining means is the number of operating sprinkler heads in each warning area.