JP2014050546A - Foam fire-extinguishing facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foam fire-extinguishing facility which does not feed out a foam liquid from a foam liquid tank when the facility is not started, to solve the problem that, in the foam fire-extinguishing facility for supplying a mixer with the foam liquid in the foam liquid tank by the water which is pressurized and supplied by a fire pump, a pressure balance in a piping is broken by a change in an ambient temperature so that the foam liquid leaks from the foam liquid tank via the mixer although the foam fire-extinguishing facility is not started in the ordinary monitoring state.SOLUTION: A foam fire-extinguishing facility comprises a normally closed block valve interposed between a foam liquid tank and a mixer and is opened only when a fire pump is started.

Description

  The present invention relates to a foam fire extinguishing facility that extinguishes a fire.

  Conventionally, as a facility for extinguishing an oil fire, a foam fire extinguishing facility is generally widely provided. In the foam fire extinguishing equipment, if a fire breaks out, the foam stock solution stored in the foam stock solution tank and the water from the water source are mixed in a mixer to create foam fire-extinguishing water, and then discharged from the foam outlet as foam fire-extinguishing water. Or foamed and released.

JP 2012-95897 A

  In such a foam extinguisher, the secondary side of the mixer is filled with a foam aqueous solution at a predetermined pressure so that the water for foam extinguishing is quickly released in the event of a fire, and the primary side of the mixer is supplied from a water source. Of water is filled at a predetermined pressure.

  However, the balance between the pressure in the foam stock solution tank and the pressure in the pipe is broken due to factors such as the ambient temperature of the foam extinguishing equipment going up and down, and the positional relationship between the foam stock solution tank and the mixer and piping is bad. In spite of the fact that the foam fire extinguishing system has not been activated, the foam stock solution in the foam stock solution tank flows into the pipe via the mixer, and the mixing ratio of the foam fire-extinguishing water in the pipe is higher than the specified value. There was a problem that the foam stock solution in the foam stock solution tank was reduced.

An object of this invention is to provide the foam fire extinguishing equipment which does not send out foam stock solution from a foam stock solution tank when the foam fire extinguishing equipment is not started.

The foam fire-extinguishing equipment according to the present invention includes a foam discharge port that discharges a foam aqueous solution in the event of a disaster, a fire-extinguishing pump that pressurizes and sends out water, a foam-discharging port and the fire-extinguishing pump connected to each other, and the distribution of the water. A water pipe, a mixer for mixing the water and the foam stock solution at a predetermined ratio, and generating the foam aqueous solution, storing the foam stock solution, and storing the foam stock solution stored in the water. And a normally closed stop valve provided between the foam stock solution tank and the mixer, and the stop valve is opened when the fire pump is activated. It is characterized by becoming.

According to the present invention, a normally closed blocking valve is provided between the foam stock solution tank and the mixer, and the blocking valve opens when the fire pump is activated. Since the stock solution does not flow out, the concentration of the foam aqueous solution in the water pipe can always be set to an appropriate value.

Moreover, according to this invention, the check valve provided in order to prevent inflow of the water and foam aqueous solution from a mixer to a foam stock solution tank becomes unnecessary.

Further, according to the present invention, since the blocking valve is opened by the pump activation signal, it is not necessary to newly provide a control panel or the like, and the cost increase due to the addition of the blocking valve can be minimized.

It is an example of the foam fire extinguishing equipment which concerns on embodiment of this invention.

<Embodiment>
Hereinafter, in the present embodiment, a case where the present invention is applied to a foam fire extinguishing facility installed in a parking lot or the like will be described as an example.
FIG. 1 is an equipment system diagram of the foam fire extinguishing equipment of the present invention.
As shown in FIG. 1, the first embodiment includes a foam head 10 corresponding to a foam discharge port, a sensing head 9, a simultaneous release valve 8, a foam stock solution tank 5, a mixer 6, a water storage tank 2, a fire pump 3, It is composed of a water distribution pipe 4 and the like, and is a facility in which when a fire occurs, the sensing head 9 operates to open the simultaneous release valve 8 and the fire extinguishing pump is activated to release the aqueous foam solution from the foam head 10.

  The foam head 10 is an open head connected to the secondary side of the simultaneous open valve 8 described later via a foam fire-extinguishing pipe 16 and is composed of a wire mesh or a deflector (not shown). To release as.

  The sensing head 9 is connected to a simultaneous opening valve 8 to be described later via a sensing pipe 15, and a heat sensing unit (not shown) is activated by the heat of the fire, and discharges pressure water (foam aqueous solution) in the sensing pipe 15. .

  The simultaneous release valve 8 can flow pressure water from a water distribution pipe 4 described later into the sensing pipe 15 and closes when a predetermined pressure or more is applied to the sensing pipe 15. In normal times, since the pressure water is sealed in the sensing pipe 15 by the sensing head 9, the simultaneous release valve 8 is closed. When the sensing head 9 is actuated and the pressure in the sensing pipe 15 becomes lower than a predetermined value, the pressure is released, and the aqueous foam solution is circulated through the foam extinguishing pipe 16 connected to the secondary side.

  The flowing water detection device 7 is provided on the primary side of the simultaneous opening valve 8 and has a check valve structure. When flowing water is generated from the primary side toward the secondary side, the flowing water detection device 7 is opened to transmit a flowing water signal. To do. The running water signal sounds an acoustic device 18 such as a bell to notify that a fire has occurred around it.

  The foam stock solution tank 5 includes a diaphragm 51 formed of rubber or the like inside, stores the foam stock solution in the diaphragm 51, and sends the foam stock solution by pressing the diaphragm 51 from the outside with water.

  The mixer 6 mixes water and foam stock solution at a predetermined mixing ratio (for example, 3%) to generate a foam aqueous solution. The foam stock solution tank 5 and the mixer 6 are connected by a foam stock solution delivery pipe 17.

  The water tank 2 stores water for use in fire extinguishing equipment.

  The fire extinguishing pump 3 supplies the water in the water storage tank 2 under pressure.

  The water distribution pipe 4 connects from the water storage tank 2 to the simultaneous open valve 8 via the fire pump 3, the mixer 6, the flowing water detection device 7, and the like. In addition, since the secondary side of the mixer 6 in the water distribution pipe 4 is filled with the aqueous foam solution, the aqueous foam solution is discharged from the start of discharge in the event of a fire. The water distribution pipe 4 is branched on the secondary side of the fire pump 3, and one end thereof is connected to the foam stock solution tank 5.

When the pressurized air tank 11 is connected to the water distribution pipe 4 and is pressurized from the state filled with atmospheric air to the monitoring pressure of the foam fire extinguishing equipment 1, the air in the pressurized air tank 11 is compressed and pressurized. Water enters the air tank 11. A pressure switch 12 for monitoring the pressure in the pressure air tank 11 is connected to the pressure air tank 11, and a pressure drop signal is transmitted when the pressure in the pressure air tank 11 becomes a predetermined value or less.

  The pump control panel 13 receives the pressure drop signal transmitted from the pressure switch 12 and transmits an activation signal for the fire pump 3. In addition, a pump stop button for stopping the fire pump is provided, and a stop signal is transmitted to the fire pump 3 when the pump stop button is pressed. Further, when transmitting a start signal to the fire pump 3, an open signal is also transmitted to a later-described stop valve 14, and when a stop signal is transmitted to the fire pump 3, a close signal is also transmitted to a later-described stop valve 14.

The blocking valve 14 is connected to the foam stock solution delivery pipe 17 and is opened and closed by a signal from the pump control panel 13 and is normally closed.

A case where a fire occurs in such a foam fire extinguishing facility will be described.
When a fire occurs in the protection section, the sensing head 9 is activated, and the foam aqueous solution pressurized and filled in the sensing pipe 15 is released. When the foam aqueous solution is released and the pressure in the sensing pipe 15 decreases, the simultaneous release valve 8 opens.

When the simultaneous release valve 8 is opened, the aqueous foam solution is released from the foam head 10 via the foam extinguishing pipe 16, and the pressure in the water distribution pipe 4 is reduced. When the pressure in the water distribution pipe 4 drops to the set pressure of the pressure switch 12, the pressure switch 12 detects the pressure drop and transmits a pressure drop signal to the pump control panel 13.

When receiving the pressure drop signal, the pump control panel 13 transmits an activation signal to the fire extinguishing pump 3 and transmits an open signal to the blocking valve 14. The fire extinguishing pump 3 that has received the start signal feeds water from the water storage tank 2 to the water distribution pipe 4 under pressure. Further, the blocking valve 14 that has received the opening signal opens to open the foam stock solution delivery pipe 17.

Part of the water supplied under pressure by the fire pump 3 flows into the foam stock solution tank 5 and presses the diaphragm 51 from the outside of the diaphragm 51. The compressed diaphragm 51 delivers the foam stock solution stored inside to the foam stock solution delivery pipe 17.

Since the blocking valve 14 connected to the foam stock solution delivery pipe 17 is open, the foam stock solution flows into the mixer 6 and is mixed with water flowing through the water distribution pipe 4 at a predetermined mixing ratio to form a foam aqueous solution. Sent to the next side.

The foam aqueous solution opens the flowing water detection device 7 to which the open simultaneous release valve 8 is connected, flows into the open simultaneous open valve 8, and is discharged from the foam head 10 through the foam stock solution delivery pipe 17. Is done.

Next, the normal time of the foam fire extinguishing equipment 1 will be described.
During normal times, the sensing head 9 is not operating, so the simultaneous release valve 8 is closed and the foam fire extinguishing equipment 1 is not activated. However, the pressure in the water distribution pipe 4 may change due to a change in ambient temperature or a change in the volume of air in the pipe. At this time, if there is no blocking valve 14, depending on the pressure balance, water or foam aqueous solution flows from the mixer 6 into the foam stock solution tank 5, or conversely, the foam stock solution flows from the foam stock solution tank 5 into the mixer 6. That happens.
Conventionally, only the inflow from the mixer 6 to the foam stock solution tank 5 is supported by installing a check valve in the foam stock solution delivery pipe 17 so as to flow only from the foam stock solution tank 5 to the mixer 6. It was.

  In the case of the foam fire-extinguishing equipment 1 of the present invention, since the stop valve 14 that is closed unless the fire-extinguishing pump 3 is activated is provided, even if the pressure in the water distribution pipe 4 fluctuates during normal times, The problem of inflow of water or foam aqueous solution into the foam stock solution tank 5 does not occur.

Depending on the site, in addition to the fire extinguishing pump, there may be an auxiliary pump that reduces the discharge volume and sets the starting set pressure higher than that of the fire extinguishing pump to repair a slight pressure drop in the water distribution pipe. When the pump is started, the blocking valve is not opened, and the blocking valve is opened only when the fire extinguishing pump is started.

In addition, when the fire extinguishing pump is activated by both the fire detector and the pressure drop signal in the water pipe, the stop valve is opened only when either the fire detector signal or the pressure drop signal in the water pipe is used. Without such a configuration, the stop valve is opened only when the fire pump is activated.

  As described above, in the foam fire extinguishing equipment installed in a parking lot or the like as described above, when the pump control panel 13 transmits a pump activation signal, the opening signal is transmitted to the blocking valve 14, When the pump control panel 13 receives the pressure drop signal of the pressure switch 12, the pump is always started. Therefore, the pressure drop signal may also be transmitted to the blocking valve 14, and the blocking valve 14 may be opened by the pressure drop signal.

Further, the equipment is not limited to this, and the equipment may be used for equipment using a closed-type foam head instead of the foam head 10, the sensing head 9, and the simultaneous opening valve 8.

Moreover, you may use for the foam fire hydrant installation etc. which start a fire extinguishing pump by starting operation of a pump starting pushbutton (equivalent to a pump starting operation means) manually. In this case, similarly to the embodiment, when the pump control panel transmits a pump start signal, it may be configured to transmit an open signal to the blocking valve, and when the pump start push button is pressed, the pump is always started. Therefore, a signal indicating that the pump activation push button has been pressed may be transmitted to the blocking valve, and the blocking valve may be opened by the signal.

DESCRIPTION OF SYMBOLS 1 Bubble fire extinguishing equipment, 2 Water storage tank, 3 Fire extinguishing pump, 4 Water distribution pipe, 5 Foam stock solution tank, 6 Mixer, 7 Flowing water detection apparatus, 8 Simultaneous open valve, 9 Sensing head, 10 Foam head, 11 Pressure air tank, 12 Pressure switch, 13 Pump control panel, 14 Stop valve, 15 Sensing pipe, 16 Foam extinguishing pipe, 17 Foam stock solution delivery pipe, 18 Acoustic device, 51 Diaphragm.

Claims (4)

A foam outlet that discharges aqueous foam in the event of a fire;
A fire pump that pressurizes and delivers water;
A water pipe through which the water is circulated, connecting the foam outlet and the fire pump;
A mixer that is provided in the water pipe, mixes the water and the foam stock solution at a predetermined ratio, and generates the aqueous foam solution;
A foam stock solution tank for storing the foam stock solution and sending the foam-extinguishing stock solution stored in the water to the mixer;
Provided between the foam stock solution tank and the mixer, and a normally closed blocking valve;
With
The foam fire-extinguishing equipment, wherein the blocking valve is opened when the fire-extinguishing pump is activated.
The foam fire extinguishing equipment includes a pump control panel that controls the start and stop of the fire pump, the pump control panel sends a pump start signal to the fire pump, and the blocking valve is opened by the pump start signal. The foam fire-extinguishing equipment according to claim 1.
The foam fire-extinguishing equipment detects the pressure in the water distribution pipe, and when the pressure in the water distribution pipe falls below a predetermined pressure, sends a pressure drop signal, and the blocking valve is opened by the pressure drop signal. The foam fire-extinguishing equipment according to claim 1.
The said foam fire-extinguishing equipment is provided with a manual pump activation operation means for activating the fire extinguishing pump, and the blocking valve is opened when the pump activation operation means is activated. Foam fire extinguishing equipment.