JPH11276623A - Fire-fighting facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable initial fire fighting and to attain the reduction of facility costs. SOLUTION: This fire-fighting facility has a batch opening valve 5 to connect piping 15 for sensing provided with a sensing head 17 and piping 3 for fire- fighting provided with a fire-fighting head 6. In this case, the piping 15 for sensing head is filled with compressed air and the primary side of the batch opening valve 5 is filled with water. Thus, since a solution for fire-fighting can be immediately discharged from the fire-fighting head when a fire occurs, initial fire fighting is enabled. Since it is enough to arrange one air compressor only over the piping for sensing and any accelerator is not required, remarkable cost-down is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire extinguishing system having a foam head, an open sprinkler head and the like.

[0002]

2. Description of the Related Art In a conventional wet fire extinguishing system using a simultaneous release valve, a fire extinguishing water is filled in a fire extinguishing pipe between an automatic alarm valve and a simultaneous release valve, and a sensing head connected to the simultaneous release valve is provided. The fire pipe is filled with fire extinguishing water. In this equipment, when the sensing head of the sensing pipe is opened due to the occurrence of a fire, the fire extinguishing water in the pipe is released to a low pressure, and the simultaneous opening valve is opened. Then, the fire extinguishing water in the fire extinguishing pipe is released from the fire extinguishing head, and the automatic alarm valve opens to issue a running water alarm. In summer, the rise in air temperature may cause an increase in pipe pressure, which may cause a damage accident.

In such a wet-type fire extinguishing system, if it is installed in a cold region, the fire extinguishing pipe freezes in winter, causing accidents such as rupture of the pipe, damage, and water discharge failure.

In order to solve this problem, a so-called dry fire extinguishing system is used in which fire extinguishing piping and sensing piping are filled with compressed air instead of fire extinguishing water.

[0005]

However, this dry fire extinguishing system has the following problems. (1) Since compressed air is present between the automatic alarm valve and the simultaneous release valve, it takes a long time for the fire extinguishing water to reach the fire extinguishing head when a fire occurs, making initial fire extinguishing difficult.
Therefore, the compressed air in the fire extinguishing pipe must be forcibly discharged using an accelerator (rapid opening device). (2) Since the air compressor that supplies compressed air to the fire extinguishing pipe and the air compressor that supplies compressed air to the sensing pipe are separately provided, equipment costs increase.
In addition, in order to shorten the time required for water discharge, the size of the protective section per running water detection device (automatic alarm valve) is reduced, so that the number of running water detection devices increases and the cost increases.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to enable initial fire extinguishing and to reduce equipment costs.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a fire extinguishing system having a sensing pipe having a sensing head, a fire extinguishing pipe having a fire extinguishing head, and a simultaneous release valve to which both pipes are connected. A fire extinguishing system, characterized in that the sensing head piping is filled with compressed air to be dry, and the primary side of the simultaneous opening valve is filled with water to be wet.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventor has noticed that when a wet-type fire extinguishing system is installed in a cold district or a high-temperature place in summer, the sensing pipe is easily damaged. That is, the sensing pipe is easily damaged due to its smaller diameter than the fire extinguishing pipe between the simultaneous release valve and the automatic alarm valve.

Therefore, the primary side of the simultaneous release valve disposed in the fire extinguishing pipe is filled with fire extinguishing water and the sensing pipe is filled with compressed air. In addition, a heat retaining means such as a heater may be provided in the fire extinguishing pipe to positively prevent freezing.

[0010]

FIG. 1 shows an embodiment of the present invention. For example, a fire extinguishing pipe 3 is connected to the secondary side of the automatic alarm valve 1 provided for each floor. The fire extinguishing pipe 3 is provided with, for example, a simultaneous release valve 5 provided for each fire extinguishing section, and the secondary fire extinguishing pipe 3b is provided with a foam head 6. Primary fire extinguishing pipe 3 for simultaneous release valve 5
a is filled with a foam aqueous solution BW as fire extinguishing water. The fire extinguishing pipe 3a on the primary side is provided with a heater 12. In addition, the valve body 10 of the automatic alarm valve 1 is normally closed. The simultaneous release valve 5 is a dry type simultaneous release valve and includes, for example, a butterfly valve 5 that is opened and closed by an air cylinder.

The simultaneous opening valve 5 is connected to a sensing pipe 15 having an orifice OF. The pipe 15 is provided with a plurality of sensing heads 17, for example, a closed sprinkler head. This pipe 15 is provided with an air compressor 18 and a pressure switch 20. In addition, 21
Is a manual valve.

Next, the operation of the present invention will be described.
First, fire monitoring will be described. The fire extinguishing pipe 3a is filled with the foam aqueous solution BW at a predetermined pressure, and is heated by the heater 12 as needed in cold weather. The control of the heater 12 is performed by the control panel CB. The inside of the sensing pipe 15 is filled with compressed air of a predetermined pressure by the air compressor 18, but since the fluid to be filled is air, there is no danger of freezing.

Since the valve body 10 of the automatic alarm valve 1 is in close contact with the valve seat 25 by a predetermined pressure of the aqueous foam solution BW of the fire extinguishing pipe 3a as shown by a chain line, the water passage hole 26 is closed. . The primary side of the valve element 10 is filled with a foam aqueous solution BW having a predetermined pressure. The foam aqueous solution BW is generated by mixing the foam raw solution B supplied from the foam raw liquid tank 30 and the fire extinguishing water W pumped from the water storage tank 31 by the pump 32 in the mixer 34.

Next, the case when a fire occurs will be described. When a fire occurs and the sensing head 15 is opened, the compressed air is discharged, and the pressure in the sensing pipe 15 decreases.

As the pressure drops, the simultaneous release valve 5 opens, and the aqueous foam solution BW in the secondary fire extinguishing pipe 3a immediately flows into the secondary fire extinguishing pipe 3b, Released as Therefore, quick fire extinguishing activities can be performed.

With the release of foam from the foam head 6, the pressure in the fire extinguishing pipe 3a on the primary side of the automatic alarm valve 1 decreases.
As shown by the solid line, the valve element 10 is opened, and the water passage hole 26 is opened.
Therefore, the aqueous foam solution BW on the primary side of the valve element 10 flows into the secondary side thereof, and the aqueous foam solution BW also flows into the water passage 26.

When the aqueous foam solution BW flows into the water passage hole 26, the pressure switch 40 is operated to transmit a release alarm signal to the fire receiver, and an alarm is displayed on the receiver panel, and a bell or the like at the place where the fire occurs is displayed. Let it ring.

When the pressure in the pipe drops due to the discharge of water in the fire extinguishing pipe, a pressure switch 36 provided in the pressurized air tank 35 is operated, and a pump start signal is sent to the control panel CB. Then, the control panel CB starts the motor 37 to start the operation of the pump 32.

The foam concentrate B in the foam concentrate tank 30 is fed into the mixer 34 by the pump operating pressure, and mixed with the fire extinguishing water to a prescribed concentration in the mixer 34 to form a foam aqueous solution. Is done.

The embodiment of the present invention is not limited to the above. For example, a water spray fire extinguishing system using a water spray head instead of the foam fire extinguishing system may be used. Further, the heater provided in the secondary fire extinguishing pipe does not necessarily need to be a heating wire, and other heat retaining means can be used. It is needless to say that this heater can be omitted in a place where there is no possibility of freezing.

[0021]

According to the present invention, the fire extinguishing liquid can be immediately discharged from the fire extinguishing head when a fire occurs. Therefore, the fire extinguishing can be started earlier than in the conventional dry-type fire extinguishing equipment, so that the initial fire extinguishing is possible. It is sufficient to arrange one air compressor only for the sensing pipe,
Further, since an accelerator is not required, the cost can be significantly reduced as compared with the conventional example.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automatic alarm valve 3 Fire extinguishing pipe 3a Primary fire extinguishing pipe 3b Secondary fire extinguishing pipe 5 Simultaneous release valve 10 Valve body 12 Heater

Claims (2)

[Claims] 1. A fire extinguishing system comprising: a sensing pipe provided with a sensing head; a fire extinguishing pipe provided with a fire extinguishing head; and a simultaneous open valve to which both pipes are connected; A fire extinguishing system wherein compressed air is filled to make a dry type, and a primary side of the simultaneous opening valve is filled with water to make a wet type. 2. An automatic alarm valve is provided on the primary side of the simultaneous release valve,
The fire extinguishing system according to claim 1, wherein a heat retaining means is provided between the automatic alarm valve and the simultaneous opening valve.