JPH01151468A - Foam fire extinguisher - Google Patents

Abstract

PURPOSE: To obtain an inexpensive foam extinguisher requiring no mounting work suited to small oil fires by a method wherein, when an automatic valve is opened, a foam solution and extinguishing water flow to a foam generator by a pressure gas to be mixed at a specified ratio and discharged from a nozzle and blown to a net to generate a highly bubbling foam. CONSTITUTION: A foam extinguisher 5 is constituted of a double-structured cylinder body 6, and a circular housing part 7 in the peripheral part is divided in two, i.e., a foam solution tank 9 and an extinguishing water tank 10 by a partition wall 8. When a fire occurs in a storage solution bit 3, a closed type sprinkler head 18 is thermally operated and extinguishing water in a pressure storage chamber 27 of an automatic valve 13 is discharged at the sprinkler head 18. A valve body 25 of an automatic value 13 is pushed up by the pressurized extinguishing water from the extinguishing water tank 10 to mix the foam solution and the extinguishing water with an orifice. The mixed solution is blown to a net 11 for generating a foam from a nozzle 15 through a constant flow valve 14 to be highly foamed and thus, flows into the solution storage bit 3 to be gradually accumulated thereby extinguishing a fire.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a foam fire extinguisher installed in pits of petroleum tanks, culverts of petroleum complexes, or pits or oil sumps such as utility ditches.

<Prior Art> In chemical and petroleum plants, high expansion foam generators are installed for the purpose of extinguishing fires and suppressing evaporation.

<Problems with the Prior Art> However, with this type of device, even in the event of a small-scale fire, the entire dike must be filled with foam, which is not only uneconomical but also expensive to install.

<Means for Solving the Problems> In view of the above points, the present invention aims to provide an inexpensive foam fire extinguisher that is suitable for small-scale oil fires and does not require installation work. A cylinder with a double structure that has an annular cross-sectional accommodating part on the periphery and a hollow center, a foam generating net at one end of the hollow cylinder, and a foam generator at the other end. The storage section is divided into two parts by a partition wall, one of which contains the pressurized gas and the foam concentrate, and the other,
It is filled with pressurized gas and fire extinguishing water, and is connected to the foam generator through suction pipes.

〉 When a fire is detected by a heat-sensitive splinter head or the like and an automatic valve is opened, the foam concentrate and fire extinguishing water are flowed by pressurized gas into the foam generator installed in the hollow part of the cylinder, where The foam is mixed at a predetermined ratio and discharged from a nozzle, and is sprayed onto a net to generate highly foamed foam, which is then deposited on the fire source and extinguished the fire.

<Example> Hereinafter, an example of the foam fire extinguisher of the present invention will be shown in Figures 1 to 3.
This will be explained using figures. In Figure 1, 1 is an oil tank;
2 is a dike, 3 is a liquid storage pit, and 4 is a conventional high-expansion foam generator, which includes a foam generator 41, a mixer 42, and a pump 43, 44 installed in the dike 2. It is composed of a foam stock solution tank 45 and a water tank 46. 5 is a cylindrical foam fire extinguisher of the present invention provided on the upper edge of the liquid storage bit 3.

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

Reference numeral 11 denotes a foam generating net, which is provided at one end of the hollow portion at the center of the cylinder 6, and reference numeral 12 is a foam generator provided at the other end. The foam generator 12 is composed of an automatic valve 13 that also serves as a foam mixer, a constant flow valve 14, and a nozzle J5, and 16.1.7 is connected between the automatic valve 13 and the sea liquid tank 9 and fire extinguishing water tank 10, respectively. The suction pipe 18 provided in the is a closed type sprinkler head, and is connected so that the automatic valve 13 is opened by its heat-sensitive operation.

Further, 19 is an on-off valve provided between the sea liquid tank 9 and the fire extinguishing water tank 10.

The automatic valve 13 that also serves as a foam mixer is provided with a fire extinguishing water flow port 21 communicating with a large diameter valve port 20 and a sea liquid inlet 23 communicating with a small diameter valve port 22 on the primary side, and a secondary sea liquid inlet port 23 communicating with a small diameter valve port 22. A mixed liquid outlet 24 is provided on the side, and a nozzle 15 is connected via a constant flow valve 14 . A cylindrical valve body 25 that partitions the primary side and the secondary side is connected to the valve port 20 by a spring 26.
．． 22 , and the pressure accumulator chamber 27 inside thereof is connected to the closed sprinkler head 18 . Further, 28 is a communication hole provided in the valve body 25.

Next, the action of the foam fire extinguisher will be explained. When a fire occurs in the liquid storage pit 3, the closed type splinter head 18 operates in a heat-sensitive manner at a small scale, and the fire extinguishing water in the pressure accumulation chamber 27 of the automatic valve 13 is released from the splinter head 18. . As a result, the valve element 25 of the automatic valve 13 is pushed up by the pressurized fire extinguishing water from the fire extinguishing water tank 10, and here, the foam stock solution and fire extinguishing water pass through an orifice (not shown) inserted into the foam stock solution side. ), for example, to 3%. This mixture is
The foam generating net 1 is supplied from the nozzle 15 via the constant flow valve 14.
1, it foams to a high degree, flows into the liquid storage pit 3, and gradually stacks up, extinguishing the fire.

In addition, when a small-scale fire as described above cannot be extinguished, the high-expansion foam generator 4 is operated to discharge foam throughout the dike 2 to extinguish the fire.

Therefore, the device 4 generates a large amount of foam even in a small-scale fire.
Since the fire is never activated, efficient fire extinguishment can be achieved.

In the above embodiment, the foam fire extinguisher of the present invention is installed in the liquid storage pit of an oil tank, but it may also be installed in a culvert or parking lot of an oil complex. Furthermore, if the foam fire extinguisher of the present invention is installed in an underground manhole or public ditch, even if a tank truck or the like falls on the ground and a fire breaks out in the ditch, the fire can be extinguished at a small scale. can.

Further, in the above embodiment, one foam fire extinguisher is provided in the liquid storage pit, but a plurality of foam fire extinguishers may be provided and controlled in conjunction with each other. Further, in the above embodiment, a closed splinter head was used as the heat-sensitive sensor, but a fusible plug or a leakage sensor may be used, or an automatic valve and a mixer may be provided separately.

<Effects> Since the foam fire extinguisher of the present invention is configured and operates as described above, it has the effect of providing an inexpensive foam fire extinguisher that is suitable for small-scale oil fires and does not require installation work.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a foam fire extinguisher according to an embodiment of the present invention installed in a petroleum complex, Fig. 2 is a sectional view of the foam fire extinguisher of Fig. 1, and Fig. 3 is a schematic diagram of the foam fire extinguisher of Fig. 2. It is a cross-sectional view of an automatic valve that also serves as a valve. 5... Foam fire extinguisher, 6... Cylindrical body, 7... Accommodation part, 8
... Bulkhead, 9... Marine liquid tank, 10... Fire extinguishing water tank,
11... Foam generating net, 12... Foam generator, 13
... automatic valve that also serves as a foam mixer, 14 ... constant flow valve,
15... Nozzle, 18... Closed splinter head. Special rj ura l, ru゛＼j, L person 1 disaster industrial system company No. 1
! Chishi 2 Figure 3 Diagram - ″)F>

Claims (1)

[Scope of Claims] 1. A cylinder with a double structure having a housing part with an annular cross section at the periphery and a hollow center, and a net for generating bubbles at one hollow end of the cylinder, A foam generator is provided at the other end, and the storage section is divided into two by a partition wall, one of which is filled with pressurized gas and foam concentrate, and the other is filled with pressurized gas and fire extinguishing water, each with a suction tube. A foam fire extinguisher, characterized in that it is connected to the foam generator described above via a foam fire extinguisher. 2. The foam fire extinguisher according to claim 1, wherein the foam generator includes 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 that is automatically opened by a heat-sensitive sensor. 4. The foam fire extinguisher according to claim 2, wherein the automatic valve is an automatic mixing valve that also serves as a foam mixer and 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 sprinkler head. 6. The fire extinguisher according to claim 3 or 4, wherein the heat-sensitive sensor is a fusible plug.