JPS6248508B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a pre-action type dry automatic fire extinguishing system.

There are two types of sprinkler systems: wet piping systems and dry piping systems. In particular, the dry piping system is considered suitable for cold regions and has been used only under limited conditions, and there are only a few examples of it being used in Japan. On the other hand, the wet piping system is labor-saving as an initial fire extinguishing equipment, as it automatically detects and extinguishes fires, and can efficiently extinguish fires by spraying water using only a small number of heads at the point where the fire started. It is widely used because it has excellent functions such as fire extinguishing automation), energy saving (highly efficient water use), and reliability.

However, the problems with the equipment cannot be ignored. It is as follows.

(1) Bursting accidents caused by freezing during winter.

(2) Accidental explosion due to external impact.

(3) Rupture accidents due to water hammer phenomenon in water distribution pipes and branch pipes.

(4) Head fatigue accident due to constant pressurization.

(5) Deterioration of water supply function due to water coagulation or sticking inside the pipes.

(6) Water damage after initial fire extinguishment.

In addition, dry piping methods include a method in which the water pipe is filled with compressed air instead of water, and a method in which the control valve is opened in response to a signal from a fire detection sensor to fill the water pipe with water, thereby closing the fire point. There is a pre-action method that extinguishes fire by spraying water by operating the head. The latter pre-action method is
Since it is not filled with compressed air in the front-back system, it has the advantage of reducing maintenance and piping construction costs.Also, by restoring the fire detection sensor when the fire is extinguished, the control valve can be automatically or remotely operated. It has excellent functions such as closing the valve and reducing water damage without sending large amounts of water unnecessarily. In this method, the fire extinguishing function is achieved through a series of continuous operations: fire outbreak, detection, filling of the pipe with water, operation of the closed head, and extinguishing. However, the empty piping section from the control valve to the closed head has a large volume. If
It took a long time to fill the pipe with fire extinguishing water from the control valve, and there was a risk that initial extinguishing could be missed. In addition, although water damage can be reduced to some extent by closing the control valve after the fire is extinguished and not sending in excess water, the residual water in the pipes once filled with water will be completely discharged from the activated head, causing damage to large facilities. The larger the situation, the greater the scale of water damage. On the other hand, similar to the compressed air-filled dry piping method, the structure must be such that residual water can be discharged from the piping and the secondary side of the control valve after the equipment has been used (fire, test, etc.), so the so-called general unwinding piping for sprinklers is required. Since it is impossible to do so, there is a practical problem, and there are no examples of implementation in Japan.

This invention overcomes all the above-mentioned drawbacks.
a fire extinguishing head that opens when a predetermined temperature is reached;
A control valve that is opened or closed by a signal from a fire detection sensor or a manual operation signal, enables water to be sent to the secondary side when the valve is opened, and quickly drains water from the secondary side after the valve is closed; Installed at the end of the secondary piping,
The present invention provides a fire extinguishing system equipped with an air vent and water filling confirmation device having an automatic air venting function and a water filling confirmation function. Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a system diagram of a fire extinguishing device according to an embodiment of the present invention. In the figure, 1 is a water tank, 2 is a pump, 3 is a main pipe, 4 is a drain pipe, 5 is a vent, 6 is an elevated water tank, 7 is a pump panel, 8 is a central control panel, 9 is a district control panel, and 10 is an air vent/filler. Water confirmation device, 11
is a control valve, 12 is a water supply pipe, 13 is a water supply branch pipe, 14
1 is a closed sprinkler head, 15 is a heat detector, 16 is a smoke detector, 17 is a smoke prevention damper, 1
8 is a fire shutter.

For example, when a fire occurs and the heat detector 15 or smoke detector 16 is activated and a fire signal is sent to the district control panel 9 and the central control panel, the district control panel 9 issues a valve opening instruction to the control valve 11. When the control valve 11 is opened, the water that has reached the primary side of the control valve 11 is sent to the water supply pipe 12. When water starts to be supplied to the water supply pipe 12, the air in the water supply pipe 12 and the water supply branch pipe 13 escapes to the atmosphere from the air vent and water filling confirmation device 10 installed at the end of the water supply pipe 12. When each pipe is filled with water, the disk is closed and a confirmation signal is sent to the district control panel 9 and the central control panel 8.
Controlled devices such as the smoke prevention damper 17 and the waterproof shutter 18 are also controlled as necessary by the district control panel 9 which receives the above-mentioned fire signal. When the heat from the fire reaches a predetermined temperature, the sprinkler head 14 is opened by the heat, and the fire is extinguished by spraying water from the head.
In addition, the sprinkler head 14 and the water supply branch pipe 13
It is preferable that the connection be made with an antifreeze unwinding pipe to prevent freezing. The above-mentioned control valve 11 will be described in more detail as follows based on FIGS. 2 and 3, which are detailed explanatory diagrams thereof.

In the figure, 19 is a piston, 20 is a stem, 21 is a valve disk, 22 is a piston stem guide, 2
3 is a cylinder bottom plate, 24 is a water inlet, 25 is a spring, 26 is a primary pressure accumulation chamber, 27 is a secondary pressure accumulation chamber,
28 is the bonnet, 29 is the decompression port, 30 is the vent,
31 is the valve seat (water supply side), 32 is the valve seat (drainage side), 3
3 is a seat ring, 34 is a solenoid valve, 35 is an exciting coil, 36 is a movable valve, 37 is a pressure switch, 38
39 is an automatic drain valve, 39 is a gate valve, and 40 is a drain port.

In normal times, as shown in FIG.
The bonnet 28 is pushed toward the right side by the cracking pressure of the bonnet 28. For this reason, the valve disk 21, which is connected to this via the piston system 20, is pressed against the body seat ring 31', and the body seat ring 31' is attached to the valve seat 31, which protrudes toward the center. It's closed. When water is supplied from the water supply side through the gate valve 39, pressurized water flows into the primary pressure accumulation chamber 26 from the water inlet on the circumference of the cylinder bottom plate 23, and the cracking pressure of the spring 25, the pressure receiving area of the piston 19, and the valve The water pressure based on the difference between the pressure receiving area of the disk 21 and the pressure receiving area of the disk 21 together press the piston 19 in the right direction in the figure, so that the valve disk 21
The close contact between the seat ring 33 of the valve seat 31 and the body seat ring 31' of the valve seat 31 is strengthened to maintain the valve closed state. At this time, since the electromagnetic valve 34 is deenergized and in a closed state, water does not flow out from the pressure reduction port 29 provided on the side wall of the primary pressure accumulation chamber 26.

Next, as described above, when a magnetic signal is applied from the district control panel 9 to the solenoid valve 34 due to the operation of the heat sensor 15 or the like, the movable piece 36 moves and the piping 29
A and 34A communicate with each other, and the pressurized water in the primary pressure accumulation chamber 26 is rapidly discharged from the pressure reduction port 29. This drained pressurized water reaches the secondary pressure storage chamber 27 via the pipes 29A, 34A, 38A and the port 30, and presses the piston 19 to the left. At this time, the pressure from the pressurized water is also applied to the pressure switch 37, and if the pressure exceeds a predetermined value, an alarm signal will be sent out. At this time, the automatic drain valve 38 does not operate under pressure and is therefore not involved in this series of operations. This automatic drain valve 38 drains water in a non-pressurized state or in a state close to it. When pressurized water is discharged from the primary pressure accumulation chamber 26,
The pressure applied to the right by the piston 19 is weakened, and the valve disk 21, which is receiving pressure from the water supply side, is pushed to the left and is pressed against the body seat ring 32' as shown in FIG. Close the valve seat 32. As the valve disk 21 moves, the valve seat 31 opens, so water from the water supply side is sent to the water supply pipe 12.

After the fire has been extinguished, the time switch in the central control panel 8 or district control panel 9 is activated, and after an arbitrarily set time elapses, for example 3 to 5 minutes in the case of a general fire, the solenoid valve 34 is deenergized and closed. Let me speak. By closing the solenoid valve 34, that is, by returning the movable piece 36 to the position shown in FIG.
moves to the right, and the valve seat 31 is closed by the engagement between the seat ring 33 of the valve disk 21 and the body seat ring 31', returning to the state shown in FIG. As a result, the valve seat 32 is opened, and this valve 11
All remaining water in the water supply pipe 12 and water supply branch pipe 13 is drained from the drain port. In addition, the piping 34
Residual water in A, 38A can be removed by solenoid valve 34 or automatic drain valve 3.
8, the water is completely drained to the outside. Note that drainage from the solenoid valve 34 is performed by flowing out in accordance with the arrow 34a in FIG. The automatic drain valve 38 also opens when the pressure decreases to drain water.

Next, the configuration of the air vent/water filling confirmation device 10 will be explained with reference to FIG. 4, which is an explanatory diagram thereof. In the figure, 41 is a connection screw for connecting to a water supply pipe (not shown), 42 is a buffer cap, 43 is a disk, and 44
is the packing, 45 is the body, 46 is the body seat ring, 47 is the water inlet, 48 is the water chamber,
49 is an air vent, 50 is a vent, 51 is a lead wire, 52 is a stem, 53 is a float, 54 is a magnet for a waterproof reed switch, 55 is a waterproof reed switch, and 56 is a reflective plate.

As mentioned above, when a fire breaks out and water starts to be supplied to the water supply pipe, the air that has been inside the pipe is transferred by water pressure to the air vent and water filling confirmation device 1 installed at the end of the water supply pipe. The air is discharged into the atmosphere through the air vent 49 according to the arrow in the figure.
When the air in the pipe is released and water flows into the water chamber 48 from the water inlet 47, the float 53 gains buoyancy and rises little by little.When the water chamber 48 becomes full of water, the float 53 reaches its upper limit. As the float 53 rises, the disk 43 connected to the lower stem 52 also rises, and the gasket 44 of the disk 43 and the body seat ring 46 engage, resulting in a completely closed state. Further, as the float 53 rises, the reed switch magnet 54 attached to the upper part comes into contact with the reed switch 55, and a water charging confirmation signal is sent through the lead wire 51 of the reed switch 55. Become.

As is clear from the above explanation, the present invention can prevent freezing, reduce water damage after fire extinguishing, and reduce secondary damage due to water damage by reducing water damage, which are disadvantageous to the conventional technology. We were able to solve all of these problems.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a fire extinguishing system according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the control valve in normal conditions, Fig. 3 is an explanatory diagram of the control valve in operation, and Fig. 4 is an air vent. FIG. 2 is an explanatory diagram of a water filling confirmation device. 1...Water tank, 2...Pump, 3...Main pipe, 4...Drain pipe, 8...Central control panel, 9...District control panel, 10...Air vent and water filling confirmation device, 11...Control valve, 12...Water supply piping, 13...Water supply Branch pipe, 14 is a closed sprinkler head, 15 is a heat detector.

Claims (1)

[Claims] 1 A fire extinguishing head that opens when a predetermined temperature is reached, and a valve that opens or closes in response to a signal from a fire detection sensor or a manual operation signal.When the valve is opened, water can be sent to the secondary side, and after the valve is closed, the It is characterized by being equipped with a control valve that rapidly drains water from the side, and an air vent and water filling confirmation device that is installed at the end of the secondary side piping of the control valve and has an automatic air venting function and a water filling confirmation function. fire extinguishing equipment.