JP2568096B2 - Foam fire extinguisher - Google Patents

Description

TECHNICAL FIELD The present invention relates to a foam fire extinguisher provided for a pit of an oil tank, a pit such as a culvert or a common groove of an oil complex, or an oil sump.

<Prior Art> In chemical and petroleum plants, a high expansion foam generator is installed for the purpose of extinguishing fire and suppressing evaporation.

<Problems of the prior art> However, this type of device is uneconomical and costly to install, because the entire dike must be filled with bubbles even in a small fire.

<Means for Solving Problems> In view of the above points, the present invention is intended to obtain an inexpensive foam fire extinguisher suitable for a small-scale oil fire and requiring no installation work. A double-structured cylinder body having a hollow central portion, which is provided with a housing portion having an annular cross-section in the peripheral portion;
A foam generating net is provided at one hollow end of the cylindrical body, and a foam generator is provided at the other end side of the hollow body. The storage section is divided into two parts by one. Is a system in which fire extinguishing water is filled together with a pressurized gas, and each of them is connected to the foam generator via a suction pipe.

<Action> When a fire is detected by a heat-sensitive sprinkler head, etc. and the automatic valve is opened, the foamed liquid and fire-extinguishing water flow to the foam generator installed in the hollow part of the cylinder by the pressurized gas, and at a predetermined ratio here. It is mixed, discharged from the nozzle, sprayed on the net, and highly foamed bubbles are generated, which are stacked on the fire source and extinguished.

<Examples> An example of the foam extinguisher of the present invention will be described below with reference to FIGS. 1 to 3. In FIG. 1, 1 is an oil tank, 2 is a dike, 3 is a liquid storage pit, 4 is a conventionally-expanded high-expansion foam generator, and is a foam generator 41 provided in the dike 2. , Mixer 42, pumps 43, 44 and foam concentrate tank 45
And a water tank 46. 5 is a cylindrical foam extinguisher of the present invention provided on the upper edge of the liquid storage pit 3.

The foam fire extinguisher 5 is composed of a double-walled cylindrical body 6, and an annular housing portion 7 in the periphery thereof is divided into a foam stock solution tank 9 and a fire extinguishing water tank 10 by a partition wall 8.

Reference numeral 11 denotes a bubble generating net, which is provided at one end of the hollow portion at the center of the cylindrical body 6, and 12 is a bubble generator provided at the other end side.
The foam generator 12 includes an automatic valve 13 that also functions as a foam mixer and a constant flow valve 14
And nozzle 15, and 16 and 17 are automatic valves 13
The suction pipe, 18 provided between the foam stock solution tank 9 and the fire extinguishing water tank 10 is a closed sprinkler head, and is connected so that the automatic valve 13 is opened by its heat-sensitive operation. Reference numeral 19 is an opening / closing valve provided between the foam stock solution tank 9 and the fire extinguishing water tank 10.

The automatic valve 13 that doubles as a foam mixer has a large-diameter valve opening on the primary side.
A fire extinguishing water inlet 21 communicating with 20 and a foam liquid inlet 23 communicating with a small-diameter valve opening 22 are provided, and a mixed liquid outlet is provided on the secondary side.
24 is provided, and the nozzle 15 is connected via the constant flow valve 14. A cylinder-shaped valve body that divides the primary side and the secondary side
The spring 25 is biased by a spring 26 so as to close the valve openings 20 and 22, and the pressure accumulating chamber 27 inside thereof is connected to the closed type sprinkler head 18. Reference numeral 28 is a communication hole provided in the valve body 25.

Next, the operation of the foam extinguisher will be described. When a fire occurs in the liquid storage pit 3, the closed-type sprinkler head 18 performs a heat-sensitive operation at a small scale, and the fire extinguishing water in the pressure accumulating chamber 27 of the automatic valve 13 is discharged from the sprinkler head 18. As a result, the valve body 25 of the automatic valve 13 is pushed up by the pressurized fire extinguishing water from the fire extinguishing water tank 10, where the foamed liquid and the fire extinguishing water are:
With an orifice (not shown) inserted on the foam concentrate side,
For example, it is mixed to 3%. The mixed liquid is sprayed from the nozzle 15 through the constant flow valve 14 onto the foam generating net 11 to highly foam, and is poured into the liquid storage pit 3 to be layered as soon as it is extinguished.

If the fire is not extinguished in a small-scale fire as described above, the high expansion bubble generator 4 is operated to discharge bubbles to the entire liquid barrier 2 to extinguish the fire. Therefore, since the device 4 for generating a large amount of bubbles is not operated even in a small fire, the fire can be extinguished efficiently.

Although the foam extinguisher of the present invention is provided in the liquid storage pit of the oil tank in the above embodiment, it may be provided in the culvert of the oil complex or the parking lot. Further, if the foam extinguisher of the present invention is provided in an underground manhole or a common ditch, even if a tank truck or the like falls on the ground and a fire occurs in the ditch, it is possible to extinguish the fire at a small scale. .

Further, although one foam extinguisher is provided in the liquid storage pit in the above embodiment, a plurality of foam extinguishers may be provided and they may be interlocked with each other. Further, in the above embodiment, the closed type sprinkler head was used as the heat sensitive sensor, but it may be a fusibula plug or a leak sensor, and the automatic valve and the mixer may be provided separately.

<Effect> Since the foam fire extinguisher of the present invention is configured and operates as described above, there is an effect that an inexpensive foam fire extinguisher suitable for a small-scale oil fire and requiring no installation work can be obtained.

[Brief description of drawings]

1 is a schematic view of a foam extinguisher according to an embodiment of the present invention provided in a petroleum complex, FIG. 2 is a cross-sectional view of the foam extinguisher of FIG. 1, and FIG. 3 is a foam mixer of FIG. It is sectional drawing of the automatic valve which served as it. 5 ... Foam extinguisher, 6 ... Cylindrical body, 7 ... Housing, 8 ... Partition, 9 ... Foam solution tank, 10 ... Fire extinguishing water tank, 11 ... Foaming net, 12 ... Foaming Machine, 13 ... Automatic valve that doubles as a foam mixer, 14 ... Constant flow valve, 15 ... Nozzle, 18 ... Closed sprinkler head.

Claims (6)

(57) [Claims] 1. A double-structured cylindrical body having a hollow central portion formed in a peripheral portion and an accommodating portion having an annular cross-section, and a bubble generating net at one hollow end of the cylindrical body and the other end side thereof. A foam generator is provided in the container, and the storage section is divided into two parts by a partition wall. One of them is filled with a stock solution of foam together with a pressurized gas and the other is filled with extinguishing water together with a pressurized gas. A foam fire extinguisher connected to the foam generator. 2. The foam fire extinguisher according to claim 1, wherein the foam generator comprises a mixer, an automatic valve, a constant flow valve and a nozzle. 3. The foam fire extinguisher according to claim 2, wherein the automatic valve is an automatic valve which is automatically opened by a heat sensitive sensor. 4. The foam fire extinguisher according to claim 2, wherein the automatic valve is a mixing automatic valve which doubles as a foam mixer which is automatically opened by a heat sensitive sensor. 5. The foam fire extinguisher according to claim 3 or 4, wherein the heat-sensitive sensor is a closed-type sprinkler head. 6. The fire extinguisher according to claim 3 or 4, wherein the heat-sensitive sensor is a fusible plug.