JPS585065B2 - fire extinguisher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire extinguishing system that periodically test-operates a fire-extinguishing pump to automatically check whether there is a failure or not, and maintains the normal function of the fire-extinguishing equipment at all times. This invention relates to a fire extinguishing system which is capable of detecting the operation of a fire extinguishing head even when a fire breaks out inside and operates the fire extinguishing head, thereby allowing the fire extinguishing head to operate as if it were a fire extinguisher.

The inventors of the present application regularly test-operated a fire extinguishing pump that serves as a pressurized water supply source as a fire extinguishing system for buildings, apartments, etc. using an automatic alarm device, and during this test operation, a fire pump equipped with multiple extinguishing heads was used. Test valves installed at the terminals of branch pipes in each area are opened one after another, and the fire extinguishing function is checked by creating a simulated situation in each area that is the same as when a fire extinguishing head activates and releases water in an actual fire. We are proposing a new fire extinguishing system.

By the way, fire detection in such fire extinguishing systems involves installing automatic alarm devices (flowing water detection or pressure detection devices) in branch pipes in each area to detect the presence or absence of running water or a drop in pressure when the fire extinguishing head is activated due to a fire. In addition to giving a start command to the fire pump, the system also identifies and displays the area where the fire occurred.

However, with the above-mentioned fire extinguishing system, if a fire breaks out in the area and the fire extinguishing head is activated while the test valve is opened and the fire pump is operating under actual load, the fire pump will not be able to receive pressurized water from the fire pump. Therefore, there was a problem in that the automatic alarm device installed in the branch pipe was already activated, making it impossible to detect an actual fire during the test operation.

The present invention has been made in view of the above, and in order to ensure fire detection during test operation, a district flow meter is installed at the inlet of the branch pipe in each district, and in the steady monitoring state, the water discharge rate of the fire extinguishing head is Compare the flow rate output with the standard value determined based on
During the test, a fire signal is output when the flow rate output exceeds the above reference value, and the test valve on the pipe bed of the branch pipe is opened.
The reference value is switched to a predetermined value larger than the above reference value, and a fire signal is output when it is detected that the flow rate output exceeds this reference value.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram showing an example of the equipment configuration of the fire extinguishing system of the present invention. An internal combustion engine 4 is installed, and pressurized fire extinguishing water from a fire pump 3 driven by the electric motor 2 or the internal combustion engine 4 is branched into branch pipes 6a to 6f on each floor via a main water supply pipe 5 extending upward. ing.

District flow meters 8a to 8f are provided at each of the branch portions between the main pipe 5 and each of the branch pipes 6a to 6f to detect and output the flow rate of fire extinguishing water flowing into each of the branch pipes 6a to 6f. , a test valve 11a is installed at the terminal of each branch pipe 6a to 6f.
11f and tube bed test flowmeters 12a to 12f, respectively, are provided, and are finally connected to a drain pipe 13.

Note that the flow meters 12a to 12f may be flow switches or pressure switches.

The elevated water tank 14 installed on the roof is used to fill the main pipe 5 and branch pipes 6a to 6f with water, and applies head pressure to the pressure tank 15 installed in the basement to compress the air in the tank. , due to the pressure of compressed air in this pressure tank 15,
The fire extinguishing head 9 is pressurized under normal conditions (at least 1 kg/cm2 for the head installed on the top floor).

In addition, the terminal (rooftop side) of the water main 5 is connected to the test valve 1.
6 and a test flow rate sensor or pressure sensor 17 to the drain pipe 13.

On the other hand, a pressure sensor 18 for detecting the discharge pressure is provided on the discharge side of the fire pump 3 in the basement, and the discharge pressure is returned to the water tank 1 via a test valve 19 and a test flow sensor 20.

Note that 21 is a priming tank that stores priming water for the pump 3, and 22 is a pump starting board.

An embodiment of the fire extinguishing apparatus of the present invention used in the fire extinguishing equipment constructed as described above is shown in the block diagram of FIG.

In Fig. 2, 26a to 26f and 27a to 27e are comparators, and district flowmeters 8a to 8a installed in each district, respectively.
The flow rate output of 8f is compared with the reference value Vr1 or Vr2.

29a to 29f are relay switches switched by relays 28a to 28f, and 30 is each relay switch 29.
an OR circuit whose inputs are the outputs of the comparators switched by a to 29e and the output of the comparator 26f; 31 is an OR circuit whose inputs are the outputs of a light failure detection circuit (not shown);
32 is an OR circuit which inputs the output of a serious failure detection circuit (not shown), and 25 is an OR circuit which inputs the outputs (E0 to E2) of these OR circuits 30 to 32 to the fire pump 3 and test valves 11a to 11f. This is a control device that outputs control signals.

In addition, the relay switches 29a to 29e and the comparator 26f
The output is also configured to be output to a fire identification indicator (as shown in the figure, in the direction of the arrow).

The above reference value Vr1. Vr2 is set as follows.

That is, Vrl is a comparison reference value used in the steady monitoring state, and is set slightly lower than the water discharge flow rate value of one head in order to be able to detect the operation of at least one fire extinguishing head.

Further, Vr2 is a reference value for comparison used during a test operation in which the test valves 11a to 11f are opened, and each test valve is designed to normally flow a flow rate equivalent to one fire extinguishing head. The flow rate value is set to be 5 points lower than the flow rate value corresponding to each individual portion.

In the steady monitoring state, the relays 28a to 28f are not excited, so the relay switches 29a to 29f are switched to the illustrated state.

Therefore, the flow rate output of each of the district flow meters 8a to 8f is compared with the reference value Vr1, and when at least one fire extinguishing head in any district is activated, the comparator corresponding to this district outputs the fire signal E0. Then, the signal is outputted to the control device 25 via the OR circuit 30 to start the fire extinguishing pump 3 and supply extinguishing water under pressure.

At the same time, a fire identification indicator (not shown) is activated to indicate which floor the fire has occurred.

Next, when performing a test operation, the test valves 11a to 11f on each floor are sequentially opened with the fire pump 3 in operation, but at this time, the relays 28a to 28f are also sequentially energized, and the relay switches 29a to 29f are activated. The contacts are sequentially switched to the opposite side of the state shown in the figure.

For this reason, the flow rate output of the district flow meters 8a to 8f and the reference value V
r2 are sequentially compared, and when at least one of the fire extinguishing heads in the area corresponding to the test operation is activated, the detected flow rate Q exceeds the reference value Vr2, and at least one of the fire extinguishing heads in the area not corresponding to the test operation is activated. When one operates, the detected flow rate Q exceeds the reference value Vr1, so
The comparator corresponding to this area outputs the fire signal E0, and outputs it to the control device 25 via the OR circuit 30, closes the test valve that is open at that time, and continues the operation of the fire pump 3. Show which district a fire has occurred in.

Note that the control device 25 is normally programmed to conduct tests on a monthly or weekly basis, and for testing in each area, the test valves 11a to 11f are sequentially opened at regular intervals, and the branch pipe 6a is opened. The same water supply condition as when the fire extinguishing head 9 was activated is created at ~8f, and the test operation ends when all test valves are opened.

Meanwhile, during the test, the temperature of the fire pump 3, the current and temperature of the electric motor 2, and the operating state of the engine 4 are detected by sensors (not shown).

Therefore, in the above explanation regarding the flow rate comparison of the control device 25, the case where the water supply system including the pump 3 is normal has been explained. ．． When E2 is output, the test is stopped.

Therefore, if the fire signal E0 is output while the test is stopped due to a minor failure, the fire pump 3 will be started.
If the fire signal E0 is output while the test is stopped due to a serious failure, the fire pump 3 is not operated in order to prevent secondary disasters.

In the above-described embodiment, only the comparison of the flow rate of the district flowmeter 8f was configured by switching the comparator 26f to the reference value side, but it is also possible to perform all flow comparisons by switching to the reference value, or, There is no problem in implementing the comparator switching method for all the district flowmeters 8a to 8f.

As explained above, according to the fire extinguishing system of the present invention, even if a fire occurs during test operation using the automatic inspection device, it can be reliably detected, and the water supply system including the fire pump can be activated to extinguish the fire. This has the excellent effect of ensuring maintenance and inspection of the fire extinguishing system and extinguishing fires in the event of a fire.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the equipment configuration of the present invention, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1...Water tank, 2...Electric motor, 3...Fire pump, 4...Internal combustion engine, 5...Water supply main, 6a to 6f...
- Branch pipe, 8a-8f... District flow meter, 9... Fire extinguishing head, 11a-11f... Test valve, 12a-
12f...flow meter for tube bed test, 26a to 26f, 2
7a-27e... Comparator, 28a-28f... Relay, 29a-29f... Relay switch, 30-32
...OR circuit, 25...control circuit.

Claims (1)

[Claims] 1. A fire system in which a plurality of fire extinguishing heads are provided in each branch pipe that is installed in each district and is supplied with pressurized water from a pump, and when the fire extinguishing head is activated, the district where the activated fire extinguishing head is installed can be identified. In a fire extinguishing system configured to output a signal, a district flow meter is installed at the inlet of a branch pipe in each district, and the flow rate output of the district flow meter is based on the flow rate of water discharged by the operation of at least one fire extinguishing head. A comparator that outputs a fire detection signal when it detects that the temperature has exceeded a predetermined standard value, and a comparator that outputs a fire detection signal when it detects that the fire detection signal exceeds a predetermined standard value. A fire extinguishing device comprising: a reference value switching circuit that switches to another reference value that is larger than the reference value by a predetermined value.