JPH0889594A - Foamed fire extinguishing facility and manual start valve to be used for the same - Google Patents

Abstract

PURPOSE: To reducing pressure by ejecting fire extinguishing liquid from piping for sensing and to prevent the ejected fire extinguishing liquid from flowing out of a foam head when the pressure inside the primary side piping of the foamed fire extinguishing facility, deluge valve or piping for sensing gets abnormally high. CONSTITUTION: A bypass circulating path 19 is installed at a manual start valve 18 fitted to the terminal of piping 14 for sensing, and a relief valve 20 for letting the fire extinguishing liquid at abnormally high pressure flow out is installed at the bypass circulating path. Besides, a bypass circulating path 27 is formed inside a main body 21 of the manual start valve in addition to a main circulating path 25, and a relief valve 28 is installed at this bypass circulating path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam fire extinguishing facility for extinguishing a fire by generating and spraying a fire extinguishing liquid from a foam head when a fire occurs, and a manual start valve used therefor.

[0002]

2. Description of the Related Art A very flammable gasoline is stored in a tank of a vehicle, and when the vehicle burns,
You cannot extinguish a fire with water. Therefore, in buildings such as parking lots and car repair shops where many automobiles are placed, foam extinguishing equipment that sprays the extinguishing liquid in the form of foam when a fire occurs is installed.

The foam extinguishing equipment has an excellent feature that even if it has a very strong flammability, such as gasoline, it can prevent burning and easily extinguish the fire because it covers the combustion products with bubbles to block oxygen.

In general, the foam extinguishing equipment includes a stock solution tank filled with a stock solution of foam, a water tank in which water is stored, a pressure tank for applying a constant pressure in the primary side pipe, a mixer for mixing the stock solution and water, A water flow detection device that detects a fire when a fire extinguishing liquid mixed in a mixer passes and issues an alarm, or activates incidental equipment for foam extinguishing equipment, and a simultaneous opening valve that opens and closes the valve during a fire and inspection , A closed type sprinkler head that detects the fire and opens the valve of the simultaneous opening valve, a foam head that sprays the fire extinguishing liquid in the form of foam, and a manual start valve that discharges the fire extinguishing liquid at the time of inspection.

In the foam extinguishing equipment, the primary side pipes from the water tank, the stock solution tank, the mixer, the flowing water detection device to the simultaneous opening valve are filled with the extinguishing liquid, but the secondary piping from the simultaneous opening valve to the foam head is used. The side pipe is not filled with fire extinguishing liquid. A control pipe communicating with the primary side chamber of the simultaneous opening valve is connected with a detection pipe equipped with a closed type sprinkler head for detecting fire, and the detection pipe is also filled with a fire extinguishing liquid.

When a fire occurs in a building in which foam extinguishing equipment is installed, a closed type sprinkler head for detecting fire, which is installed near the flame, operates. Then, the fire-extinguishing liquid filled in the sensing pipe flows out from the closed type sprinkler head, so that the pressure in the sensing pipe decreases, and at the same time, the piston valve in the simultaneous opening valve opens at the same time. The pump of the water tank is started by the command of the pressure switch. Then, when the water pumped by the pump flows into the mixer, it is drawn into the momentum of the water and the undiluted solution in the undiluted solution tank also flows into the mixer, where it is mixed in the mixer and extinguished with a concentration suitable for creating bubbles. It becomes liquid. The fire extinguishing liquid flows from the water flow detection device to the secondary pipe through the simultaneous open valve, and is sprayed from the foam head. When the fire-extinguishing liquid is sprayed from the foam head, the foam head entrains air to form foam, and the foam covers the origin of the fire to suffocate it to extinguish the fire.

By the way, in the foam extinguishing equipment, the closed type sprinkler head for fire detection and the simultaneous opening valve are designed in consideration of the safety factor, and the normal pressure is 10 Kgf / cm.
It is designed to withstand three times the pressure of ^two . However, if the pressure in the pipe exceeds 30 Kgf / cm ² , the design safety factor will be exceeded, so the closed type sprinkler head for fire detection, the simultaneous open valve, the pipe, and other incidental equipment will be destroyed. Will end up.

The cause of abnormally high pressure inside the sensing pipe in the foam fire extinguishing equipment installed in the parking lot is that the parking lot has no ceiling and the sensing pipe is laid near the roof. When the roof becomes hot due to sunlight, the heat heats the sensing pipe and thermally expands the fire-extinguishing liquid in the sensing pipe. Then, in the pipe having a small volume, the pressure in the pipe becomes 3 to 5 times the normal pressure even if the extinguishing liquid is slightly expanded.

[0009]

In view of the above problems, the applicant of the present invention has a practical application for a simultaneous open valve capable of eliminating high pressures in the pipe and the simultaneous open valve even if the pressure is high.
-92190. The simultaneous release valve has a safety valve installed therein, and allows the extinguishing liquid having an abnormally high pressure to flow out from the safety valve. This simultaneous release valve is very effective in eliminating abnormal high pressure in the sensing pipe,
Since the safety valve is installed under the piston valve, the fire extinguishing liquid flowing out from the safety valve will flow into the secondary side pipe.
Therefore, if the amount of outflow from the safety valve increases, the extinguishing liquid will flow out from the foam head attached to the secondary side pipe, and the inside of the building will be contaminated with the extinguishing liquid.

[0010]

[Means for Solving the Problems] The inventors of the present invention have found that if the high pressure extinguishing liquid is prevented from flowing out to the secondary side pipe, it will not flow out from the foam head and the inside of the building will be contaminated with the extinguishing liquid. Can be prevented.

According to the present invention, when a fire occurs, a closed type sprinkler head attached to the sensing pipe operates to lower the pressure in the sensing pipe, so that the simultaneous opening valve is opened and the secondary side of the simultaneous opening valve is opened. In a foam fire extinguisher system that sprays fire extinguishing liquid from a foam head attached to a pipe, if the fire extinguishing liquid becomes abnormally high in the sensing pipe, a relief valve that can flow out the high pressure extinguishing liquid and depressurize it is detected. It is a foam extinguishing facility characterized by being installed in the piping for
In addition, a main flow passage that connects the inflow port and the outflow port is formed in the main body, a valve body is installed in the middle of the main flow passage, and a main flow passage is provided between the inflow port and the outflow port. Has another bypass flow passage, and when the extinguishing liquid on the inlet side becomes abnormally high pressure in the middle of the bypass flow passage, it can be passed through and discharged to the outlet side. It is a manually activated valve that is equipped with a relief valve.

The relief valve installed in the sensing pipe according to the present invention can be installed in the bypass portion of the manually activated valve or can be installed as an integral structure in the manually activated valve.

[0013]

[Operation] Since a relief valve that allows the abnormally high pressure extinguishing liquid in the pipe to flow out to normal pressure is installed in the sensing pipe, if the sensing pipe becomes abnormally high in pressure, the extinguishing liquid is discharged to the secondary pipe. It can be discharged to the drain pipe without flowing into. Further, if the relief valve is built in the manual start valve, it is not necessary to install a relief valve separately, so that not only the labor for mounting but also the appearance is improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a piping system diagram of the foam extinguishing equipment of the present invention, and FIG. 2 is a front sectional view of a manual starting valve which is another invention.

In the foam extinguishing equipment of the present invention, a water tank 1 and a pump 2 are connected to a mixer 3, and a pressure tank 4 is connected in the middle thereof. In addition, the mixer 3 has a stock solution tank 5
Is connected. Further, the mixer 3 is connected to a flowing water detecting device 6, and the flowing water detecting device 6 is connected to a simultaneous opening valve 7. From the water storage tank 1 to the simultaneous opening valve 7 is a primary side pipe 8.

The inside of the simultaneous opening valve 7 is partitioned into a primary side chamber 9 and a secondary side chamber 10, and a piston valve 11 is installed vertically movable toward the primary side chamber of the partitioned opening. The above-mentioned primary side pipe 8 is connected to the primary side chamber 9, and a sensing pipe 14 having a large number of closed type sprinkler heads 13 for sensing attached thereto is connected to a control chamber 12 communicating with the primary side chamber.

The shutoff valve 1 is provided in the secondary side chamber 10 of the simultaneous open valve 7.
5 is connected to the end of which is connected a secondary side pipe 17 to which a larger number of foam heads 16 ... Are attached than the closed type sprinkler head.

At the end of the sensing pipe 14, a manual actuating valve 18 capable of letting out the same extinguishing liquid as one closed sprinkler head when opened is attached.

A bypass 19 is connected to the secondary pipe 17 so as to surround the manual start valve 18, and a relief valve 20 is connected to the bypass 19.

The relief valve is a safety device in which the valve body is pressed by a compression spring, and when the valve body is exposed to a fluid having a pressure higher than a predetermined pressure, the valve body is pushed away and the fluid flows out.

In the present invention, a bypass may be provided in the secondary side pipe and a relief valve may be installed in the bypass. However, a manual start valve having the relief valve incorporated therein is connected to the secondary side pipe. May be.

Here, the manual start valve of the present invention in which the relief valve is incorporated will be described. As shown in FIG. 2, the manual start valve 21 is a ball valve, and a main flow passage 25 is formed between an inflow port 22 connected to the sensing pipe 14 and an outflow port 24 connected to the drain pipe 23. A ball-shaped valve element 26 is installed in the main flow passage.

A bypass flow passage 27 is formed between the inflow port 22 and the outflow port 24 in addition to the main flow passage.
A relief valve 28 is installed on the way. The relief valve means that the compression spring 30 presses the valve body 29, and when the pressure of the extinguishing liquid on the inlet side exceeds a predetermined pressure, the extinguishing liquid pushes the valve body 29 against the spring bias and repels the extinguishing liquid. To flow into the bypass flow passage 27. The spring force of the compression spring 30 is adjusted by adjusting the screwed state of the plug 31.

Next, the operating state, the inspection state, and the state of eliminating abnormal high pressure in the pipe in the foam extinguishing system of the present invention will be described.

In normal times, the piston valve 11 of the simultaneous open valve 7 has its opening closed, and the shutoff valve 15 connected to the secondary chamber.
Is open. At this time, the fire extinguishing liquid having a constant pressure in the pressure tank 4 is filled in the primary side pipe 8, the primary side chamber 9 of the simultaneous release valve 7, the control chamber 12, and the sensing pipe 14, but the secondary side chamber 10, The secondary side pipe 17 is not filled.

When a fire occurs in a building equipped with this foam extinguishing system, the closed type sprinkler head 13 installed near the origin of the fire operates to discharge the extinguishing liquid in the sensing pipe 14. Then, the control room 12 of the simultaneous opening valve 7
The piston valve 11 is opened and the extinguishing liquid flows from the primary side chamber 9 into the secondary side chamber 10 because the pressure decreases. At this time, a pressure switch (not shown) senses a pressure drop in the primary side pipe, activates the pump 2, and sends the water in the water storage tank 1 to the mixer 3. When water flows into the mixer 3, the stock solution is drawn from the stock solution tank 5 into the mixer 3, and becomes a fire extinguishing solution having a mixing ratio suitable for forming bubbles in the mixer and passes through the running water detection device 6. The water flow detection device 6 detects a fire by the passage of the fire extinguishing liquid, issues an alarm, and displays the fire site.

The extinguishing liquid flowing from the primary side pipe 8 into the simultaneous open valve 7 is the primary side chamber 9, the secondary side chamber 10 and the shutoff valve 1.
5. It reaches the foam head 16 through the secondary side pipe 17, where air is entrained to create foam, which is then sprayed to the fire source. The foam scattered on the fire source cools the fire source and at the same time covers the fire source to block the air, thereby extinguishing the fire in a suffocated state.

In the inspection of the foam extinguishing equipment, the closing valve 15 is closed and then the manual starting valve 18 is rapidly opened. Then, from here, almost the same fire extinguishing liquid as one closed-type sprinkler head flows out, so that it is as if the closed-type sprinkler head was activated. Then, the piston valve 11 of the simultaneous release valve 7 is opened, the pressure of the primary side pipe 8 is lowered, the pump 2 is started, and the water tank 1
The water is allowed to flow into the mixer 3, and the stock solution is also allowed to flow from the stock solution tank 5 into the mixer 3. Then, the mixed fire extinguishing liquid flows from the water flow detection device 6 into the simultaneous release valve 7. In the simultaneous open valve 7, the fire extinguishing liquid is not sprayed from the foam head because the closing valve 15 of the secondary pipe is closed even if the piston valve 11 is opened. When it is confirmed that each auxiliary device of the foam extinguishing equipment has normally operated in this way, the manual start valve 18 is closed, the pump 2 is stopped, and then the stop valve 15 is opened to prepare for the fire extinguishing.

Next, the operating state when the pressure inside the sensing pipe becomes abnormally high will be described. When the inside of the sensing pipe equipped with the manual starting valve of the present invention becomes abnormally high in pressure, the pressure of the fire extinguishing liquid filled up to the inflow port 22 in the main body 21 of the manual starting valve increases, and the valve body 29 is compressed by the compression spring 30. Push away against. Then, the fire extinguishing liquid passes from the inflow port 22 through the bypass flow passage 27, flows into the outflow port 24, and is discharged from the drain pipe 23 connected to the outflow port 24.
When the pressure of the fire-extinguishing liquid in the sensing pipe reaches a predetermined pressure because the fire-extinguishing liquid slightly flows out from the inside of the sensing pipe,
The valve body 29 is pushed back by the compression spring 30, and the outflow of the fire extinguishing liquid from the inflow port is stopped.

[0030]

As described above, in the foam extinguishing system of the present invention, since the relief valve is installed in the sensing pipe, when the sensing pipe becomes abnormally high in pressure, the fire extinguishing liquid in the sensing pipe is relieved. You can pull it out a little and let it drain into the drain pipe. Therefore, there is an excellent effect that the fire extinguishing liquid extracted for depressurization does not flow out of the foam head and stain the inside of the room unlike the conventional case.
Further, since the manual start valve of the present invention has the relief valve built therein, it does not require additional labor for attaching the relief valve, and it is aesthetically excellent because it is compact as an integrated structure.

[Brief description of drawings]

FIG. 1 is a piping system diagram of the foam extinguishing equipment of the present invention.

FIG. 2 is a front sectional view of a manual start valve of the present invention.

[Explanation of symbols]

 7 Simultaneous opening valve 13 Closed type sprinkler head 14 Piping for sensing 16 Foam head 17 Secondary side piping 18 Manual start valve 19 Bypass 20 Relief valve

Claims (4)

[Claims] 1. When a fire occurs, a closed type sprinkler head attached to the sensing pipe operates to lower the pressure in the sensing pipe, so that the simultaneous release valve is opened to the secondary side pipe of the simultaneous release valve. In a foam fire extinguisher system that sprays fire extinguishing liquid from the installed foam head, a relief valve that allows the high pressure fire extinguishing liquid to flow out and reduce the pressure when the fire extinguishing liquid becomes abnormally high in the sensing pipe has a sensing pipe. Foam fire extinguishing equipment characterized by being installed in. 2. The foam fire extinguishing equipment according to claim 1, wherein the relief valve is installed in a bypass portion of a manually activated valve. 3. The foam fire extinguishing equipment according to claim 1, wherein the relief valve is integrated with a manual start valve. 4. A main flow passage is formed in the main body to connect the inflow port and the outflow port, a valve element is installed in the middle of the main flow passage, and the main flow passage is provided between the inflow port and the outflow port. If a bypass flow passage separate from the main flow passage is formed, and if the fire extinguishing liquid on the inlet side becomes abnormally high pressure in the middle of the bypass flow passage, it is passed through and discharged to the outlet side. A manual start valve used for foam extinguishing equipment, which is equipped with a relief valve that can be activated.