JP4903527B2 - Large capacity foam water extinguishing system foam mixing equipment - Google Patents

Description

  The present invention relates to a foam mixing device for a large-capacity foam water discharge fire extinguishing system. More specifically, the hose installation work in a large-capacity foam water discharge fire extinguishing system using a large-diameter water supply hose having a diameter of 200 mm or more is facilitated, and the fire extinguishing work is made efficient The present invention relates to a foam mixing device.

  In response to a fire in an oil storage tank that occurred in a recent oil complex, the Ordinance for Enforcement of the Disaster Prevention Act for Oil Complexes was revised. As shown in the example of FIG. 5, the fire extinguishing equipment before the revision is composed of a large high-altitude water discharge vehicle 51, a large chemical vehicle 52 and a foam stock solution transport vehicle 53 having a water discharge capacity of 3000 liters per minute. A three-point set was used (see Patent Document 1). The fire extinguishing work by this three-point fire extinguishing equipment is to supply fire extinguishing water from the fire hydrant 54 to the large chemical vehicle 52 and supply foaming agent from the foam stock solution transport vehicle 53, so Foam mixed water in which a foaming agent was mixed was generated, and this foam mixed water was supplied to the large height aerial discharger 51 and discharged from the large aerial discharger 51 toward the fire source.

  However, in an oil storage tank fire that occurred in a recent oil complex, the above-mentioned three-point fire extinguishing equipment could not function sufficiently to extinguish the oil storage tank fire. Therefore, the Ordinance for Enforcement of Disaster Prevention Law for Oil Complexes, etc. was revised to strengthen the function of the self-defense disaster prevention organization at specific establishments equipped with oil storage tanks, etc., and foam discharge with a capacity of more than 10,000 liters per minute as fire extinguishing equipment It was obliged to have a gun. The water discharge capacity of the foam cannon before the revision was more than 3000 liters per minute, so the water discharge capacity was strengthened more than 3 times.

  As a result of the large capacity of the foam cannon, the conventional fire hydrant equipment may not be able to secure the amount of water discharged, and natural water such as the sea may have to be used as a water source. Became. Therefore, it has become necessary to use a large-diameter hose having a diameter of 200 mm or more and 250 mm or more as a water supply hose for taking a large amount of natural water, and laying them connected to each other over a long distance.

  However, when a large-diameter hose with a diameter of 200 mm or more is used, the diameter of the connecting metal fitting also increases, so that the weight of the entire hose with the metal fitting increases. For this reason, in the fire extinguishing work, the operator must lift the water hose with the heavy metal fitting to the height of the hose fitting of the large chemical vehicle and install it on the fitting. As a result of this heavy labor, water discharge preparation work before fire extinguishing is significantly delayed and fire fighting activities may become inefficient.

In addition, as another problem, it is also very difficult to stably supply an appropriate amount for mixing the foaming agent so as to obtain a desired mixing ratio for fire-fighting water that is supplied to a large chemical vehicle by a large-diameter water supply hose. It can be difficult.
JP-A-11-137709

  A main object of the present invention is to provide a foaming agent mixing device that facilitates a hose installation work in a large-capacity foam water discharge fire extinguishing system using a large-diameter water supply hose and makes the fire fighting work more efficient.

  Another object of the present invention is to provide a foam mixing device for a large-capacity foam water discharge fire extinguishing system that allows a foam to be mixed stably in an appropriate amount even when a large amount of water is supplied by a large-diameter water supply hose.

The foaming agent mixing apparatus of the large-capacity foam water discharge fire extinguishing system of the present invention that achieves the above-mentioned main object is mounted on a transport vehicle used in a large-capacity foam water discharge fire-extinguishing system that uses a large-diameter water supply hose with a diameter of 200 mm or more. A plurality of linear mixing conduits arranged side by side in parallel with the foam supply pump, and mounting fittings for connecting the water supply hoses are respectively provided at the front and rear ends of the mixing conduit. When providing a foaming agent injection port supplied from the foaming agent supply pump in the intermediate part, and making the apparatus main body detachable from the transporting vehicle and being able to be lifted and lowered to the ground, when performing fire extinguishing work The apparatus main body can be lowered to the ground before the water supply hose is mounted on the mounting bracket.

  The foam mixing device is preferably configured to include a crane for lifting and lowering the device main body on the transport vehicle. In addition, a hydraulic motor may be connected to the foam supply pump, and a hydraulic pump may be connected to a PTO shaft provided in the transport vehicle so that the hydraulic motor is driven by the hydraulic pump.

  In addition, as a foaming agent mixing apparatus for achieving the other objects described above, in the above-described configuration, a flow meter is provided in each of the mixing conduit and the supply pipe of the foaming agent inlet, and detection signals of these flow meters are used. It is preferable to provide an automatic control unit that adjusts the amount of foaming agent supplied to the foaming agent inlet so as to have a preset mixing ratio.

  According to the present invention, the apparatus main body constituting the foam mixing device is configured to be detachable from the transportation vehicle and can be lifted and lowered to the ground. Since the mounting position of the water supply hose connecting bracket can be lowered, it is easy to attach the water supply hose to the mounting fitting of the mixing conduit even for large diameter water hoses of 200 mm or more with a heavy weight connecting bracket. Can be attached to. Therefore, the fire fighting work can be made more efficient by shortening the water preparation time before the fire extinguishing.

  1 to 3 exemplify an embodiment of a foam mixing device of the present invention used in a large-capacity foam discharge water extinguishing system, and FIG. 4 illustrates a large-capacity foam discharge water extinguishing system when natural water is sampled as fire extinguishing water. An example is shown.

  First, an example of a large-capacity foam water discharge fire extinguishing system will be described with reference to FIG. 10 is a water canister equipped with a foam cannon 11 having a water discharge capacity of 10,000 liters or more per minute, 20 is a foam mixing device of the present invention, 30 is pumping sea water of 10,000 liters or more per minute from the sea S The pump device 40 is a foam container equipped with a foam tank 41.

  The foaming agent mixing device 20 of the present invention, which will be described in detail later, corresponds to the large chemical vehicle illustrated in FIG. 5, and includes a device main body 21 and a transporting vehicle 22. The foam mixing device 20 generates foam mixed water by mixing the foam supplied from the foam tank 41 with fire extinguishing water such as seawater supplied from the pump device 30, and the foam mixed water. Is supplied to the water discharge vehicle 10.

  The pump device 30 pumps over 10,000 liters of seawater per minute by a driving device 31 of a large diesel engine, a water pump 34 and a hydraulic pump 32 driven by the driving device 31, and hydraulic oil circulated by the hydraulic pump 32. It is comprised from the two submersible pumps 33 and 33 driven in this way.

  Seawater (fire-extinguishing water) pumped from the submersible pumps 33 and 33 is supplied to the water pump 34 through the water suction hoses 16 and 16, respectively, and pressurized by the water pump 34, and has a diameter of 200 mm or more, preferably 250 mm or more. More preferably, the water is supplied to the foam mixing device 20 through the large-diameter water supply hoses 15 and 15 having a diameter of 300 mm or more, and is mixed with the foam supplied from the foam tank 41 to form foam mixed water. Finally, the water is discharged from the foam cannon 11 of the water discharge vehicle 10 toward the fire source F.

  Although not shown, the pump device 30 and the foam container 40 are each conveyed to a necessary place by a conveyance vehicle.

  As shown in FIGS. 1 and 2, the foam mixing device 20 of the present invention used in the large-capacity foam water discharge and extinguishing system as described above has a device main body 21 detachably mounted on a transport vehicle 22. The apparatus main body 21 is lifted via a wire 24 by a crane 23 mounted on a transport vehicle 22 and can be lifted and lowered on the ground.

The apparatus main body 21 is provided with a foam supply pump 26, and four parallelly arranged mixing conduits 25,... 25 are installed so as to cross in the width direction. The number of the mixing conduits 25 provided in the apparatus main body 21 is plural as shown in the illustrated example . Each of the mixing conduits 25 is provided with attachment fittings 25a for connecting the connection fittings of the water supply hose 15 to both front and rear ends, and a foaming agent inlet 27 is provided on the upper wall of the intermediate portion. Foam is supplied to the injection port 27 from the foam supply pump 26 via a conduit 27a. The foam agent supply pump 26 is supplied with a foam agent from a foam agent tank 41 of a foam agent container 40 which is a supply source of the foam agent via a hose 42.

  The foam supply pump 26 is driven by a hydraulic motor 26a. Further, the hydraulic motor 26a is driven by hydraulic fluid circulated through a supply tube 28a from a hydraulic pump 28 connected to a PTO shaft taken out from a drive source (diesel engine or the like) of the transport vehicle 22. ing. The hydraulic oil is circulated and cooled in an oil cooler 29 provided on the transport vehicle 22 to prevent overheating.

  When a fire extinguishing operation is performed at the fire site by the above-described foam mixing device 20, the foam mixing device 20 is moved to a place close to the pump device 30 by the transport vehicle 22 or a place close to the water discharge vehicle 10 and stopped. Before connecting the water supply hose 15 to the fitting 25a of the mixing conduit 25 at the stop position, the apparatus main body 21 is lowered from the transport vehicle 22 to the ground using the crane 23. By lowering the apparatus main body 21 to the ground, the height of the mounting bracket 25a of the mixing conduit 25 is changed to a low position close to the ground, so that the water supply hose 15 has a large diameter of 200 mm or more to which a heavy weight coupling bracket is attached. Even a thing can be easily mounted on the mounting bracket 25a.

  The water supply hose 15 extending from the pump device 30 and the water supply hose 15 extended to the water discharge car 10 are connected to the mounting brackets 25a and 25a at both the front and rear ends of the mixing conduit 25, and the necessary number of the latter water supply hoses 15 are connected. And connected to the water discharge vehicle 10. After the water supply hose 15 is thus connected, fire-fighting water is supplied from the pump device 30 to the mixing conduit 25 of the foam mixing device 20 and the foam agent is supplied from the foam supply pump 26 to the foam inlet 27. Then, foam mixed water is continuously generated in the mixing conduit 25 and supplied to the water discharge vehicle 10 via the water supply hose 15 on the rear end side.

  FIG. 3 shows a control device for properly mixing the foaming agent into the preset mixing ratio in the large-capacity fire-fighting water fed from the pumping device 30 in the foaming agent mixing device 20 described above.

  As shown in FIG. 3, a check valve 64 and a flow meter 60 are provided in each of the four mixing conduits 25 provided. In addition to the check valve 65, a throttle valve 62 and a flow meter 63 are provided on the branch pipe 61 from the conduit 27 a connected to the foaming agent inlet 27. The flow meter 60 of the mixing conduit 25 and the throttle valve 62 and the flow meter 63 of the branch pipe 61 are each electrically connected to the control panel 66, and the four control panels 66 are connected to the main control operation panel 67. Yes.

Each control panel 66 inputs the flow rate signal detected by the flow meter 60 of the mixing conduit 25 and the flow rate signal detected by the flow meter 63 provided in the foaming agent inlet 27, and the mixing ratio calculated from both signals is calculated in advance. Compared with the mixing ratio set as an appropriate value, it is calculated whether or not the supply amount of the foam injected into the foam injection port 27 is appropriate. In the calculation, when the supply amount of the foaming agent is excessive or insufficient with respect to the mixing ratio of the appropriate value, the excessive or insufficient excess / deficiency signal is output to the drive unit of the throttle valve 62, The throttle of the throttle valve 62 is adjusted so that the amount of foam injected into the foam injection port 27 becomes a proper mixing ratio. Further, the main control operation panel 67 receives signals from the respective control panels 66 and adjusts the foam supply amount from the foam supply pump 26 based on the signals.

  Therefore, according to the foaming agent mixing apparatus 20 of the present invention, even when a large amount of water is supplied by a large-diameter water supply hose having a diameter of 200 mm or more, the amount of foaming agent supplied so that the foaming water is always in an appropriate mixing ratio. Can be controlled.

It is a side view which illustrates embodiment of the foam mixing apparatus of this invention. It is a top view which shows the condition where the apparatus main body is dropped from the foam agent mixing apparatus of FIG. It is the schematic which illustrates the control apparatus provided in the foam agent mixing apparatus of this invention. It is explanatory drawing which shows an example of the high capacity | capacitance foam water discharge fire extinguishing system in which the foaming agent mixing apparatus of this invention is used. It is explanatory drawing which illustrates the conventional foam water discharge fire extinguishing system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water discharge vehicle 15 Water supply hose 16 Water absorption hose 20 Foam mixing device 21 Main body 22 Car for transportation 23 Crane 24 Wire 25 Mixing conduit 25a Mounting bracket 26 Foam supply pump 26a Hydraulic motor 27 Foam injection port 28 Hydraulic pump 30 Pump device 31 Drive device 32 Hydraulic pump 33 Submersible pump 34 Water pump 60, 63 Flow meter 62 Throttle valve 66 Control panel 67 Main control operation panel

Claims (4)

A foam mixing device installed in a transport vehicle used in a large-capacity foam water discharge fire extinguishing system that uses a large-diameter water supply hose with a diameter of 200 mm or more, and a plurality of foam mixing devices arranged side by side in parallel with the foam supply pump A linear mixing conduit, and a mounting fitting for connecting the water supply hose to the front and rear ends of the mixing conduit, respectively, and an inlet for a foaming agent supplied from the foaming agent supply pump at an intermediate portion, In addition, the apparatus main body can be detachably attached to the transport vehicle and can be lifted and lowered to the ground. When performing a fire extinguishing operation, the apparatus main body can be lowered to the ground before attaching the water supply hose to the fitting. Large capacity foam mixing equipment for foam water fire extinguishing system.   The foaming agent mixing apparatus of the large-capacity foam water discharge fire extinguishing system according to claim 1, wherein a crane that lifts and lowers the apparatus main body is mounted on the transport vehicle.   3. The hydraulic motor according to claim 1, wherein a hydraulic motor is connected to the foam supply pump, a hydraulic pump is connected to a PTO shaft provided in the transport vehicle, and the hydraulic motor is driven by the hydraulic pump. Large capacity foam water mixing system for foam fire fighting system.   A flow meter is provided for each of the mixing conduit and the supply pipe for the foam injection port, and the foam supply amount for the foam injection port is adjusted based on a detection signal of the flow meter so as to have a preset mixing ratio. The foaming agent mixing apparatus of the large-capacity foam water discharge fire extinguishing system according to claim 1, wherein an automatic control unit is provided.

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