JPH0871173A - Emergency shut-off valve mechanism of fire extinguisher - Google Patents

Abstract

PURPOSE: To surely shut off discharging of water for fire extinguishment even in the case a fire extinguisher is destroyed by holding a valve device in the state of pressing the valve device to open by the pressure of the pressurized water from an introducing pipe in the normal time and releasing the pressurized water via a pressure releasing plug from a pressure releasing pipe and putting a shut-off valve into a closed state by a spring pressure in the even of emergency. CONSTITUTION: The pressure releasing pipe 32 which drops the internal water pressure by releasing the pressurized water in a cylinder section 30 is connected to the cylinder section 30. The connecting part of the pressure releasing pipe 32 and the cylinder section 30 is formed of a secure pipe material and the part near a fire extinguisher is formed of a pipe material which is a easily breakable and relatively weak material by the impact force. The pressure releasing pipe 32 is provided with a pressure releasing plug in an extinguisher housing box 7. The water pressure in the cylinder 30 drops and a valve piston 28 is slid and moved by the spring pressure of the spring 29 when the pressure releasing valve is released. A valve seat 24 is then pressed to an open water path 21 and a valve packing 25 is attracted to an opening cap 22, by which the valve device is closed and the water flow in a branch pipe 2 is shut off. The supply of the water flow to the fire extinguisher side is thus shut off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shutoff valve installed in a public fire extinguisher in which water discharge devices are installed at appropriate intervals on a water supply pipe for fire extinguishing provided along a bridge or along a median strip of a highway. It is related to the mechanism, more specifically the fire extinguisher,
When a vehicle accident such as a car accident on a bridge or a highway causes damage or damage due to impact, shut off a large amount of water leakage or unexpected water discharge from the water discharge device under unattended conditions at approximately the same time as the accident. The present invention relates to an emergency shutoff valve mechanism that can be operated.

[0002]

2. Description of the Related Art Conventionally, fire extinguishers have been installed at appropriate intervals on bridges and highways in preparation for fire fighting activities in the event of a fire accident. A main water supply pipe with a large diameter is placed along the
The branch pipe was branched from the main water supply pipe toward the bridge or the expressway at regular intervals, and a fire hydrant and a hose were connected to the branch pipe.

The above-described fire extinguishing device is usually installed in a box avoiding the roadway in order to utilize it for fire extinguishing activities associated with vehicle accidents. When used for the purpose of fire extinguishing, the fire extinguishing device is used. The hose is pulled out from the storage box and the fire hydrant is opened to discharge fire extinguishing water.

[0004]

However, even if the conventional fire extinguishing device is installed away from the roadway, the box is damaged or the fire hydrant is shocked by a traffic accident such as a slip accident that does not accompany a fire even if the fire extinguishing device is installed away from the roadway. The fire hydrant may be damaged and fire extinguishing water may be blown out to drain the surrounding area.Especially on the highways, the water discharged to the houses and shops under the viaduct may be poured. There was a risk of causing a second disaster. Furthermore, because such a large amount of water flows out, it becomes difficult not only to secure limited water for fire extinguishing such as in a water tank, but also to maintain performance due to a decrease in water pressure of other fire extinguishers. There was a problem.

In order to prevent the fire extinguishing device from being damaged due to such a collision accident, it may be considered that the fire extinguishing device is housed in a strong box to protect it from a shock. Forming it, on the other hand, has the problem of making it difficult to open and close the box.

On the other hand, as a means for detecting the impact force and shutting off the water supply from the water supply pipe, there is provided a shutoff valve device for electrically sensing the impact force and urgently shutting off the water supply from the branch pipe. There is a problem in that installation work is expensive due to electrical wiring work to electrically operate the valve, and the facility cost of the electric system is high.

Further, when a failure occurs in the electrical system, the emergency shutoff valve does not operate entirely, or conversely, when the emergency shutoff valve operates with a slight impact, a fire on the road requiring a fire extinguishing device is required. In some cases, such as when the water supply was stopped during a disaster, it was not useful, and it was necessary to carefully check the condition of the electrical system for maintenance.

The present invention has been made in view of the above-mentioned problems of the conventional fire extinguisher, and in a fire extinguisher connected to a water supply pipe provided along a bridge or along a median strip of a highway, a vehicle accident may occur. Even in the unlikely event that the fire extinguisher is destroyed due to impact, a simple mechanism is used to reliably shut off the water discharge for the fire extinguishing system to prevent a secondary disaster caused by water spraying in the vicinity. It is intended to be provided.

[0009]

In order to achieve the above object, the present invention provides a fire extinguisher in which a water discharge device such as a hose is connected to a tip end of a branch pipe branched from a main water supply pipe. In the middle of, a shutoff valve that shuts off the water flow inside the branch pipe in an emergency is provided so that it can be shut off inside the branch pipe by the spring pressure installed in the cylinder part.
An inlet pipe for supplying pressure water from a branch pipe located below the shutoff valve to the cylinder portion of the shutoff valve and a depressurizing pipe for discharging the pressurized water to the outside from the cylinder portion are respectively provided. A fire extinguisher characterized in that the valve device is pushed open by the pressurized water pressure from the introduction pipe, and in the event of an emergency, pressurized water is discharged from the pressure relief pipe through the pressure relief plug etc., and the shut-off valve is closed by spring pressure. It is an emergency shutoff valve mechanism in the device.

[0010]

Therefore, according to the present invention, the pressurized water from the branch pipe is supplied to the cylinder portion of the shutoff valve through the introduction pipe in the normal state, and the supplied water pressure pressurizes the cylinder portion of the shutoff valve to open the valve device. Therefore, the water supply for extinguishing the fire in a normal state is secured by maintaining the balance of the water pressure with the supply water passing through the opened valve device. When the fire hydrant is damaged due to a traffic accident or the like, by releasing it from the depressurizing pipe communicating with the cylinder part, the water pressure balance in the valve drive part is broken, and the valve device is closed by the spring pressure to close the valve. Since it is blocked, even if the fire hydrant is damaged by a traffic accident near the fire extinguisher and the surroundings are flooded, the pressure relief valve is opened to cut off the water supply from the branch pipe and waste it. Not only is it possible to secure limited fire extinguishing water in the water tank, but it is also possible to prevent the water pressure of other fire extinguishers from decreasing and to maintain its performance in a normal state. It can be maintained.

Further, by arranging the depressurizing pipe extending near the fire extinguisher, if the fire extinguishing device should be destroyed by a traffic accident such as a slip accident, the depressurizing pipe is damaged at the same time. The pressurized water in the cylinder portion of the emergency shutoff valve is discharged from the damaged portion of the depressurization pipe, the shutoff valve is closed by spring pressure, and the water supply from the branch pipe is stopped.

Further, by reducing the pipe diameter of the depressurizing pipe, the amount of water discharged to the outside through the cylinder portion is minimized, and a large amount of water is prevented from being discharged due to the destruction of the fire hydrant. Only a small amount of water can be discharged to prevent secondary disasters in the surrounding area. In addition, by providing a pressure relief plug on the pressure relief pipe, during maintenance such as inspection and replacement of the fire extinguisher, the pressure relief plug is opened and the shutoff valve is temporarily closed to check the fire extinguisher. When is closed, the shutoff valve is opened and the normal water supply state is restored.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An emergency shutoff valve mechanism in a fire extinguisher according to the present invention will be described below with reference to the drawings showing an embodiment thereof. 1 and 2 and 3 show an embodiment of the emergency shutoff valve mechanism of the present invention, in which the main water supply pipe 1 is installed along the lower space of a highway, a bridge or an elevated road, A branch pipe 2 extending upward is connected to the main water supply pipe 1 at appropriate intervals.

In the case of a bridge or the like, the branch pipe 2 is connected to the main water supply pipe 1 at intervals of about 50 m in the length direction, and a fire extinguishing device 5 including a hose 4 and the like via a flexible tube 3 to each branch pipe 2. Are connected. The fire extinguishing device 5 is provided with an opening / closing lever 6 for manually opening the water discharge valve and performing a fire extinguishing activity in the event of a fire.

Therefore, when the opening / closing lever 6 is opened, the water sent to the main water supply pipe 1 is guided to the hose 4 of the fire extinguishing device 5 through the branch pipe 2 so that the fire extinguishing activity can be performed. The amount of water supplied from the branch pipe 2 is about 40
It is set to 0 liters / minute. The fire extinguisher 5 is
It is stored in a fire extinguisher storage box 7 with a door. In this fire extinguisher storage box 7, 8 is a door opening / closing device by a gas damper that gently opens and closes the door of the fire extinguisher storage box 7. Reference numeral 9 is a pressure adjusting valve that adjusts the supply water pressure on the hose 4 side of the fire extinguisher.
It is set at liter / minute. Further, reference numeral 10 is a switch box of an indicator lamp for turning on an indicator lamp for informing the position of the fire extinguisher at night. In FIG. 1, 11
Is a guard rail that partitions the median strip of the highway and protects the fire extinguisher storage box 7.

An emergency shutoff valve 20 for shutting off the water flow passing through the inside of the branch pipe 2 is provided in the middle of the branch pipe 2. This emergency shutoff valve 20 is attached to the middle portion of the branch pipe 2 by bolting through a waterproof packing,
As shown in FIG. 2, the water passage is blocked inside by a partition wall 34, and an opening cap 22 is attached to the opening water passage 21 in which the partition wall 34 is opened. The opening water passage 21 is provided with a valve drive shaft 23 inserted through the central portion of the opening passage 21, and a valve seat 24 is fixed to the tip end portion of the valve drive shaft 23. A valve packing 25 that abuts the opening cap 22 to shut off the water passage, and a valve guide 26 that slides the valve seat 24 and the valve packing 25 along the inner surface of the opening cap 22 are provided. The valve guide 26 is fitted into the opening cap 22, and the slide of the valve guide 26 presses the valve seat 24 integrally provided with the valve packing 25 against the opening water passage 21 to close the water passage of the branch pipe 2. Is configured to let.

The other end of the valve drive shaft 23 penetrates a fixed guide 27 that slidably supports the shaft 23, and a valve piston 28 is screwed to the rear end of the valve drive shaft 23. A spring 29 is inserted between the fixed guide 27 and the valve piston 28 in a compressed state, and the spring pressure of the spring 29 trying to expand the valve piston 28
Slides to generate internal stress such that the valve seat 24 is pressed against the opening water passage 21.

The circumference of the valve piston 28 is slidably arranged in a cylinder portion 30 covering the valve piston 28, and the cylinder portion 30 and the water passage of the branch pipe 2 are connected by an introduction pipe 31. And the branch pipe 2 in the cylinder part 30
The inside of the cylinder portion 30 is supplied with pressurized water to press the valve piston 28 against the spring pressure of the spring 29. The diameter of the above-mentioned introduction pipe 31 has a pipe inner diameter of 6
m is formed. The introduction pipe 31 is connected to the branch pipe 2 located below the shutoff valve 20, and the inside of the cylinder portion 30 is formed by the balance between the strength of the pressurized water pressure from the introduction pipe 31 and the strength of the spring pressure of the spring 29. The valve drive shaft 23 is configured to push or pull the valve seat 24 by sliding the valve piston 28. In addition, at the mounting part of the spring 29, the valve piston
An air vent hole is provided to release the air pressure of the spring installation part due to the movement of 28.

The balance between the valve piston 28 and the spring 29 is such that when the pressurized water passing through the inside of the branch pipe 2 is supplied into the cylinder portion 30 in a sealed state, the internal water pressure is The area of the valve piston 28 is set so that it has a strength relationship that overcomes the spring pressure of the spring 29 that presses 28 toward the cylinder portion 30 side, and the valve is driven by the water pressure of the pressurized cylinder 30. The shaft 23 pushes the valve seat 24 to open the gap between the opening cap 22 and the valve packing 25, and supplies the water flow to the fire extinguisher 5 side through the internal water passage of the shutoff valve 20. Therefore, in the normal state, the shutoff valve 20 is opened by the water pressure of the cylinder portion 30, and the water flow inside the branch pipe 2 is constantly supplied to the fire extinguishing device 5 side.

On the other hand, the cylinder portion 30 is connected with a depressurizing pipe 32 for discharging the pressurized water inside the cylinder portion 30 to reduce the internal water pressure. In the above embodiment, the depressurizing pipe 32
Is provided by being fixed to the fire hydrant by extending from the cylinder part 30 to the inside of the fire extinguisher hangar 7. The connecting part between the depressurizing pipe 32 and the cylinder part 30 is formed of a strong pipe material such as a metal pipe, In the vicinity of the apparatus 5, the pipe material is made of a relatively weak material such as a hard vinyl chloride pipe material which is easily damaged by an impact force. Further, the pressure relief pipe 32 is provided with a pressure relief plug 33 inside the fire extinguisher storage box 7, and by releasing the pressure relief plug 33, the pressurized water inside the cylinder portion 30 is discharged through the pressure relief pipe 32. It is configured to reduce the internal pressure of the cylinder portion 30 (water pressure due to pressurized water).

That is, when the pressure relief plug 33 is opened, the water pressure inside the cylinder portion 30 decreases, and the valve piston 28 slides due to the spring pressure of the spring 29 installed between the fixed guide 27 and the valve piston 28. By pressing the valve seat 24 against the opening water passage 21 by pulling the valve packing 25 toward the opening cap 22, the valve device 20 is closed and the water flow inside the branch pipe 2 is blocked to prevent the water flow to the fire extinguishing device 5 side. It cuts off the supply.

In the vicinity of the fire extinguishing device 5 of the depressurizing pipe 32, since the pipe is made of a relatively weak material such as a hard vinyl chloride pipe and is fixed at the same position as the fire hydrant,
When the fire extinguisher hangar 7 is subjected to an impact force such as a traffic accident or the like, the depressurizing pipe 32 made of the above-mentioned hard vinyl chloride pipe material is also destroyed to depressurize the cap 33.
Similarly to the case where the valve device 20 is opened, the pressurized water in the cylinder portion 30 is discharged to close the valve device 20.

The depressurizing pipe 32 is made of a pipe material having a diameter much smaller than that of the flexible hose 3 for supplying water to the fire extinguisher and has a diameter of 10 mm.
Is configured.

Therefore, the valve device 20 has a pressure release plug 33 in an emergency such as when the fire extinguisher is damaged due to a traffic accident or the like.
Of the pressurizing pipe 32 itself is released to release the pressurized water in the cylinder portion 30 from the pressurizing pipe 32, and the emergency shutoff valve 20 is closed to break the fire extinguishing device. It is possible to stop the discharge of the supply water directly discharged from the. The pressure release plug 33 may be of any type such as a valve type or a lever type. In this way, when the depressurization pipe 32 is destroyed by an impact force, the repair work of the hard vinyl chloride pipe material is easy, and even at the accident site, the damaged part of the depressurization pipe 32 can be easily and quickly repaired. .

In addition, the pressure release pipe 32 has a structure in which the pressure release plug 33 of the pressure release pipe 32 is opened at the time of replacement or maintenance of the fire extinguishing device 5 so that the emergency shutoff valve can be temporarily operated even in an emergency. It is possible to carry out replacement work etc. by closing 20.

In the above embodiment, the end portion of the valve drive shaft 23 on the valve seat 24 side is housed inside the divided water passage of the shutoff valve 20, but as shown in FIG.
The end may be formed so as to project from the divided water passage of the valve device by a size corresponding to the slide width of the valve piston 28. In FIG. 4, the position where the shutoff valve 20 is closed by the spring pressure of the spring 29 is shown by a solid line.
A broken line shows a state in which the water is released at a water pressure of 30. In this embodiment, the pressure relief plug 33 of the pressure relief pipe 32 is of a lever bundle type. The other parts are the same parts as those in FIG. 2 and perform the same operations, so the same reference numerals are given and the description thereof is omitted.

[0027]

As described above, the present invention is a fire extinguisher in which a water discharge device such as a hose is connected to the tip of a branch pipe branched from a main water supply pipe, and the branch pipe is branched in the middle of an emergency. A shutoff valve that shuts off the water flow inside the pipe is provided so that it can be shut off inside the branch pipe by the spring pressure installed in the cylinder part, and from the branch pipe below the shutoff valve with respect to the cylinder part of the shutoff valve. An inlet pipe for supplying pressurized water and a depressurizing pipe for releasing the pressurized water to the outside from the cylinder part are respectively provided, and in a normal state, the valve device is pushed open by the pressurized water pressure from the inlet pipe, and an emergency Sometimes it is an emergency shutoff valve mechanism in a fire extinguisher characterized by releasing pressurized water from the depressurization pipe through a pressure tap, etc., and closing the shutoff valve by spring pressure.
If a fire accident occurs near the fire extinguisher and the fire extinguisher is damaged, the emergency shutoff valve is closed by releasing the pressurized water in the cylinder from the depressurization pipe to shut off the water supply from the branch pipe. , It is possible to stop wasteful water discharge.

Therefore, even if the fire extinguisher is damaged due to a traffic accident or the like, the surrounding area is not flooded, and moreover, a limited amount of water for extinguishing the fire can be secured in the water tank, and other fire extinguishing can be ensured. The device can reliably prevent the water pressure from decreasing and maintain its performance in a normal state.

Further, since the emergency shutoff valve mechanism of the present invention uses the water pressure from the branch pipe to open and close the valve device without using an electrical detection device, the installation work is easy. The construction period of the fire extinguishing system can be shortened, and even if the fire extinguishing system is directly damaged due to a traffic accident or the like, repair work on the electrical system is not required. Since it can be completed only by itself, it has the effect of being able to quickly and easily take action after an accident.

When the pressure relief tube is provided with a pressure relief plug,
The fire extinguisher can be replaced or valve-related maintenance can be performed with the valve device shut off and water supply stopped even when an accident has occurred, even after an accident has occurred. This has the advantage that the valve device can be opened and water supply to the fire extinguishing device can be restarted by only such a simple operation.

[Brief description of drawings]

FIG. 1 is an overall side view of a fire extinguisher equipped with an emergency shutoff valve mechanism of the present invention,

FIG. 2 is an enlarged sectional view for explaining the emergency shutoff valve in FIG.

FIG. 3 is an enlarged side view for explaining the depressurizing tube in FIG.

FIG. 4 is a sectional view showing another embodiment of the emergency shutoff valve of the emergency shutoff mechanism of the present invention.

[Explanation of symbols]

 1 Main water supply pipe 2 Branch pipe 5 Fire extinguishing device 6 Opening / closing lever 7 Fire extinguishing device storage box 9 Pressure adjusting valve 20 Emergency shutoff valve 21 Opening water channel 22 Opening cap 23 Valve drive shaft 28 Valve piston 30 Cylinder part 31 Introducing pipe 32 Pressure relief pipe 33 Pressure Unplug

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Hideki Higashi Hideki Higashi 4-9-2 Gakugaoka, Tarumi-ku, Kobe-shi, Hyogo No. 201 Gakugaoka Dormitory (72) Inventor Fusonosuke Makihara 1-2748 Shintakayama, Onomichi, Hiroshima Prefecture No. 50 (72) Inventor Masaru Fujita 4-2028 Kumano-cho, Toyonaka-shi, Osaka Asahi Plaza 302

Claims (2)

[Claims] 1. A fire extinguisher in which a water discharge device such as a hose is connected to a tip end of a branch pipe branched from a main water supply pipe, and a shutoff for interrupting a water flow inside the branch pipe in an emergency in the middle of the branch pipe. A valve is provided so as to be able to shut off inside the branch pipe by a spring pressure installed in the cylinder part, and an inlet pipe for supplying pressure water to the cylinder part of the shutoff valve from the branch pipe below the shutoff valve. , A pressure release pipe for releasing the pressurized water from the cylinder portion to the outside is provided, and in a normal state, the valve device is pushed open by the pressurized water pressure from the introduction pipe, and in an emergency, the pressure release pipe from the pressure release pipe, etc. An emergency shutoff valve mechanism in a fire extinguisher, characterized in that pressurized water is discharged through the shutoff valve to close the shutoff valve by spring pressure. 2. The tip of the depressurizing tube is provided so as to extend to the vicinity of the fire extinguisher, and the tube material of the depressurizing tube near the fire extinguisher is made of a material that is easily damaged by impact. The emergency shutoff valve device in the fire extinguisher according to claim 1.