JPS6226115Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a foam fire extinguishing system that is installed in tanks that store liquid flammable substances such as oil (hereinafter simply referred to as oil tanks), and is installed on the outside of the side wall of the oil tank. This invention relates to a foam fire extinguishing system consisting of a foam maker and a deflector.

Foam fire extinguishing systems conventionally used in petroleum tanks, especially floating roof tanks, are shown in Figures 1 to 3, and the equipment shown in Figure 1 replaces most of the current foam fire extinguishing systems. However, because the deflector 41, which is a part of the foam fire extinguishing system, protrudes inward from the side wall plate 42 of the oil tank, the floating roof shakes due to an earthquake or other cause, causing it to jump upward from the upper edge of the oil tank. If it climbs or floats up, the floating roof and the deflector 41 protruding inside will collide, which will not only destroy the foam fire extinguishing system and make it unusable, but also cause a fire due to sparks from the collision. be.

In addition, in the foam fire extinguishing system shown in FIGS. 2 and 3, the entire foam fire extinguishing system is installed outside the oil tank side wall plate 42, so there is no risk of collision with the floating roof; In order for the bubbles to reach the weir on the floating roof at the bottom of the tank along the tank side wall plate 42, it is necessary to buffer the release speed of the bubbles, which requires a complicated structure or a buffer chamber 43 with a large volume. It has become larger in size, such as by installing a On the other hand, when using a small deflector without a buffer chamber, it is necessary to have a buffer chamber in the form chamber, which makes the form chamber itself large and requires an inspection port to ensure the effectiveness of the deflector is not sufficient. I can't perform well.

Such a large and heavy device is not easy to safely install and mount at a high location on top of an oil tank, and it is also dangerous. In addition, conventional devices have many drawbacks, such as having many horizontal surfaces and overlapping surfaces of plates, which makes it difficult for bubbles and moisture to be discharged, which can cause corrosion. Therefore, the foam chamber 44 and deflector 41 of the conventional foam fire extinguishing system need to be provided with a removable lid 46, such as by screwing or bolting the upper part, as an inspection port 45 for checking for corrosion or repainting. This also causes rainwater and foam aqueous solutions to accumulate, causing corrosion.

This device was devised to eliminate such drawbacks. It does not require a buffer chamber, and the structure is extremely simple, with no places where water can stagnate. There are no horizontal surfaces or joints between the plates, so there is no risk of corrosion.
Therefore, the present invention aims to provide a foam fire extinguishing system for a storage tank for flammable liquids which does not require an inspection hatch for corrosion or repainting, is small and economical, and by installing the entire foam fire extinguishing system on the outside of the side wall panel of the oil tank, it will not be destroyed by a floating roof colliding with it due to the shaking of an earthquake, or become a cause of fire.

An example of the implementation of the present invention will now be described in detail with reference to the drawings.A form maker 3 is formed with an orifice 1 for controlling the flow rate and configuring a pressure reducing section, and an air suction hole 2 on the side. A cylindrical tube 4 curved at an angle of 45 to 90 degrees is connected to the downstream side of the foam maker 3, which serves as a flow path for the bubbles generated by the foam maker 3.
In order to increase the expansion ratio of the foam generated by the process and to homogenize the foam particles, the foam contacting material 5 formed of a finely woven wire mesh or a perforated plate is curved along the center line of the cylindrical tube 4. The foam maker 3 is fixed to the bracket 6 or tightly fixed to the peripheral wall of the cylindrical tube 4, and at the stage when the foam generated by the foam maker 3 moves inside the cylindrical tube 4 to the outlet opening 7. By contacting the foam contact material 5, the foaming ratio is further increased, and the foam particles are made uniform, thereby eliminating the need for a buffer chamber in conventional devices.

A fixing plate 10 for fixing to the cylindrical tube 4 via a flange 9 is vertically disposed on one side of the upper plate 8, and a foam reflecting plate 11 for reflecting bubbles is vertically disposed on the other side. A concave housing 12 is formed, and an outlet opening 7 of the cylindrical tube 4 is formed in the upper part of the fixing plate 10.
A bubble guiding opening 13 is formed in contact with and communicating with the foam guiding inclined plate 1 by making the lower part of the fixing plate 10 tilted toward the foam reflecting plate 11 by 4 to 9 degrees with respect to the vertical line.
4 is provided, and the lower part of the foam guiding inclined plate 14 is bent so as to be on the same perpendicular line as the foam reflecting plate 11 to form a mounting piece 16 to the tank side wall plate 15. A bubble confluence point 17, which is a slit with an elongated rectangular cross section, is provided between the guide inclined plate 14, and a square bubble outlet 18 is provided in the lower part of the bubble reflection plate 11 to form a deflector 19. The deflector 19 is fixed to the cylindrical tube 4 by passing through the outlet opening 7 and the bubble guiding opening 13 of the cylindrical tube 4, and is fixed to the mounting piece 16 or both sides of the deflector 19 provided as necessary. It is fixed to the tank side wall plate 15 via the auxiliary plate 20, and the foam reflecting plate 11, the mounting piece 16, and the tank side wall plate 15 are positioned on the same vertical line.

Next, to explain the operation of the present invention, the foam generated by the foam maker 3 moves along the cylindrical tube 4, during which time the foam contacts the foam contact material 5, further increasing the foaming rate and foaming, The bubble particles are homogenized and the bubbles flow into the deflector 19 through the outlet opening 7 and the bubble guiding opening 13.The flow direction of the bubbles is first caused by the bubble reflecting plate 11, and most of the bubbles flow downward. The other part is reflected backward and downward, which is collected by the bubble guiding inclined plate 14 inclined at 4 to 9 degrees with respect to the vertical line, and the bubbles flow vertically down along the bubble reflecting plate 11. Then, the bubbles flowing down from two directions along the bubble guiding inclined plate 14 are passed through the bubble confluence point 17, which is a slit with an elongated rectangular cross section, and then passed through the bubble discharge port, which is square in shape. When the foam is discharged from the tank 18, the balance between the velocity and flow rate of the foam flowing down from the two directions causes the foam to flow down to the oil surface along the mounting piece 16 and the tank side wall plate 15 without moving further therefrom. The flow of bubbles flowing down to the oil surface will be explained using FIG. The mounting piece 16 and the tank side wall plate 15 are
The oil flows down to the oil surface.

As described above, the present invention comprises a foam maker 3 formed with an orifice 1 and an air intake hole 2 on the side, a cylindrical pipe 4 curved at an angle of 45 to 90 degrees connected downstream, and a foam contact material 5 formed of a finely woven wire mesh or a perforated plate is held within the cylindrical pipe 4. A fixed plate 10 is vertically attached to one side of an upper plate 8, and a bubble reflector plate 11 is vertically attached to the other side to form a housing 12 with an inverted elongated concave cross section. A bubble guide opening 13 communicating with the outlet opening 7 is drilled in the upper part of the fixed plate 10, and the lower part of the fixed plate 10 is angled at an angle of 45 to 90 degrees with respect to a vertical line.
A bubble guide inclined plate 14 is provided by inclining it 9 degrees toward the bubble reflector 11, and the lower part of the bubble guide inclined plate 14 is further bent so as to be on the same vertical line as the bubble reflector 11 to provide an attachment piece 16. A bubble junction 17, which is a slit having a long and narrow rectangular cross section, is provided between the lower end of the bubble reflector 11 and the bubble guide inclined plate 14. A square foam discharge port 18 is provided at the lower part of the bubble reflector 11 to form a deflector 19. The deflector 19 is fixed to the cylindrical tube 4.
Since the mounting piece 16 is fixed to the tank side wall plate 15 and the foam reflector plate 11 and the tank side wall plate 15 are positioned on the same vertical line, the foam foaming rate is further increased by the foam contact material 5 provided on the curved cylindrical tube 4, and the foam particles are made uniform. There is no need for a buffer chamber or inspection hatch as in the conventional method, making the structure extremely simple. There are no areas where water stagnates, and there are no joints between the plates, so there is no risk of corrosion. Moreover, since the entire foam extinguishing device is installed on the outside of the tank side wall plate 15, there is no risk of the floating roof colliding with it and being destroyed or causing a fire due to the shaking of an earthquake. Furthermore, since the device is small and lightweight, it can be installed and attached safely at high altitudes. In addition, the foam flows down to the oil surface along the tank side wall plate 15 and does not flow down to positions away from the tank side wall plate 15, resulting in high fire extinguishing efficiency.

[Brief explanation of the drawing]

Figures 1 to 3 are sectional views of the main parts of a conventional foam fire extinguishing system, Figure 4 is a vertical sectional view of the device of the present invention, Figure 5 is a sectional view taken along the line A-A in Figure 4, and Figure 6 is Enlarged longitudinal cross-sectional view illustrating the flow of bubbles in the deflector, No. 7
The figure is a front view showing the device of the present invention attached to the side wall plate of an oil tank, and FIG. 8 is a rear view of the same. In the figure, 1 is an orifice, 2 is an air suction hole, 3 is a foam maker, 4 is a cylindrical tube, 5 is a foam contact material,
7 is an outlet opening, 8 is an upper plate, 10 is a fixed plate, 11
12 is a casing, 13 is a bubble guiding opening,
14 is a foam induction inclined plate, 15 is a tank side wall plate, 16
1 is a mounting piece, 17 is a bubble confluence point, 18 is a bubble outlet, 1
9 is a deflector.

Claims (1)

[Scope of utility model registration request] A cylindrical tube 4 curved at 45 to 90 degrees is connected to the downstream side of a form maker 3 formed with an orifice 1 and an air suction hole 2 on the side, and a wire mesh finely woven inside the cylindrical tube 4. Alternatively, while holding the foam contacting material 5 formed of a perforated plate, a fixing plate 10 is vertically disposed on one side of the upper plate 8, and a foam reflecting plate 11 is vertically disposed on the other side to form a case 12 having an inverted concave cross section. A bubble guiding opening 13 communicating with the outlet opening 7 is formed in the upper part of the fixing plate 10, and a foam reflecting plate is formed in the lower part of the fixing plate 10 at an angle of 4 to 9 degrees with respect to the vertical line. A foam guiding inclined plate 14 is provided by bending the foam guiding inclined plate 14 at an angle to the 11 side, and a mounting piece 16 is provided by bending the lower part of the foam guiding inclined plate 14 so as to be on the same perpendicular line as the foam reflecting plate 11. The lower end of the plate 11 and the bubble induction inclined plate 14
A bubble confluence point 17, which is a slit with an elongated rectangular cross section, is provided between the bubble reflector 11, and a square bubble outlet 18 is provided in the lower part of the bubble reflector 11 to form a deflector 19. is fixed to the cylindrical tube 4, and the mounting piece 16 is fixed to the tank side wall plate 15, and the foam reflecting plate 11 and the tank side wall plate 1 are fixed.
A foam fire extinguishing system for a storage tank for liquid combustibles, consisting of 5 and 5 located on the same vertical line.