JPH0424067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Floating roof storage tanks, which are often used to store flammable volatile liquids such as petroleum, are generally equipped with a foam fire extinguishing system. As shown in Fig. 1, in this foam fire extinguishing system, a fire extinguishing liquid made by mixing water and air foam stock solution at a predetermined ratio is sent to an air foam maker (foaming device) 2 by a pump 1, where it is The system generates fire extinguishing foam by inhaling air, and extinguishes the fire by discharging this fire extinguishing foam from a foam outlet 4 through a chamber 3. It is positioned above the floating roof 5b and fixed to the storage tank 5.

By the way, regarding this conventional foam fire extinguishing system,
A deflector (current transformer) 6 having a shape as shown in FIG. 1 or 2 is provided near the foam outlet 4, and the fire extinguishing foam discharged from the foam outlet 4 is The discharge direction is changed so that it flows down along the side wall 5a of the storage tank 5 and extinguishes the fire. However, since the deflector 6 is provided to protrude inward from the side wall 5a of the storage tank 5, for example, if the floating roof 5b of the storage tank 5 swings vertically due to abnormal liquid level fluctuations caused by an earthquake, Accidents have occurred in which the floating roof 5b collides with the deflector 6, damaging the deflector 6, attachments on the floating roof 5b, or the floating roof 5b itself.

In addition to the above-mentioned foam fire extinguishing device, a foam outlet is also provided in the middle of the side wall of the storage tank, and this foam outlet is covered with a lid that is flush with the side wall of the storage tank and is glued to the side wall.
A structure has also been proposed in which, when extinguishing a fire, the pressure of the fire extinguishing liquid blows the lid into the storage tank and extinguishing foam is introduced into the tank (Japanese Patent Laid-Open Publication No. 56-27262).

However, in this foam fire extinguishing system, the lid is strongly blown horizontally by the pressure of the extinguishing fluid, so it tends to fall into the storage tank when extinguishing the fire, making it difficult to securely lock the lid to the foam fire extinguishing system. . For this reason, even if the lid falls into the storage tank, or even if it is caught in the foam extinguishing system, the lid must be re-installed to restore the normal state after the fire extinguishing system has finished operating. It is necessary to adhere it to the side wall, which poses the problem of requiring a great deal of labor and complicated measures such as draining the liquid from the storage tank or assembling scaffolding. In particular, if a fire extinguishing system is activated due to malfunction or incorrect operation, there is a fundamental flaw that requires wasted measures, effort, and cost to restore the system.

The present invention prevents the floating roof from being damaged even if the floating roof shakes vertically due to an earthquake or the like.
Another object of the present invention is to provide a foam fire extinguishing system for a storage tank that does not damage the floating roof or its accessories and can reliably extinguish the fire.

In order to achieve the above object, the present invention forms a foam discharge means in the side wall 10c of a floating roof storage tank by supporting a foam discharge port 17 on a support member 18 fixed to the outer surface of the side wall. In a foam fire extinguishing device for a floating roof type storage tank that extinguishes fire in a storage tank by releasing fire extinguishing foam from an outlet, the foam release means is provided above the highest level of the liquid stored in the storage tank in a flat state, and the foam release means In the vicinity of the outlet, a rotating member is disposed inward from the side wall of the storage tank to change the discharge direction of the fire extinguishing foam by rotating inward from the side wall of the storage tank using a pin as a fulcrum only when the fire extinguishing foam is released. Alternatively, a magnet is installed on either of the rotating members to rotate the rotating member around a pin using an attractive force and restrain it on the outside of the side wall of the storage tank, and the foam release means is provided with a stopper for the rotating member. The configuration was as follows.

The present invention will be explained in detail below based on the drawings.

FIG. 3 shows an embodiment of the present invention, in which 10 is a fixed roof 10b of a floating roof 10a that can be moved up and down.
This is a well-known floating roof type storage tank with a liquid such as petroleum stored inside. The foam fire extinguishing device E of the present invention is fixedly installed in the storage tank 10, and is equipped with a pump 11 for feeding extinguishing liquid, and a riser pipe 12 along the outside of the side wall 10c of the storage tank 10.
At the same time, the lower end of this riser pipe 12 is connected to the discharge side of the pump 11 via a strainer 13, a buffer device 14 such as a flexible hose, etc., and a well-known air form maker 15 and a chamber are connected to the upper end of the riser pipe 12. 16 are arranged in series, and a cylindrical foam outlet 17 is attached to the side of the chamber 16.

The foam outlet 17 is placed in an opening h provided in a portion of the side wall 10c of the storage tank 10 above the floating roof 10a, with its end 17a slightly spaced from the opening h, and It is supported by a square box-shaped support member 18 fixed to the outer surface (bubble discharge means). Further, the bubble outlet 1 is provided on the inner surface of the vertical side plates 18a of the support member 18.
Pin holes are provided at predetermined positions above the end portions 17a of the support member 18, and stoppers 19 are fixed to the inner surfaces of the side plates 18a at predetermined positions above the height of the pin holes inside the support member 18. It has been arranged. Further, near the foam discharge port 17, a rectangular plate-shaped rotating member 20 having pins 20a on both sides is provided at the end 17 of the foam discharge port 17.
a, and is rotatably disposed in a vertical plane along the opening direction of the bubble discharge port 17, with each pin 20a fitted into each of the pin holes.

Furthermore, a magnet 24 is fixedly provided on the outer surface of the side wall 10c. This magnet 24 is the rotating member 2
0 is magnetically attracted and restrained so that it does not rotate unnecessarily during an earthquake. The restraining force of the rotating member 20 by the magnet 24 is smaller than the release pressure of the fire extinguishing foam. Therefore, when extinguishing a fire, the rotating member 20 is moved into the storage tank by the outflow pressure of the fire extinguishing foam against the restraining force by the magnet 24. It can be rotated until it protrudes inward from the side wall 10c of 10. Rotating member 2
0 is vertical as shown in FIG. 3 when fire extinguishing foam is not discharged from the foam discharge port 17.
The end portion 17a of 7 is almost closed. On the other hand, when fire extinguishing foam is discharged from the foam discharge port 17, the rotating member 20 rotates about the pin 20a as a fulcrum against the restraining force of the magnet 24 due to the outflow pressure of the fire extinguishing foam, and the lower end 20c side wall 10c of storage tank 10
The upper end 20b is made to protrude further inward and is stopped by abutting the stopper 19.

Note that 21 in the figure is a well-known sealing plate made of glass or lead and having a predetermined thickness for the effective diameter, and the fire extinguishing foam generated by the air foam maker 15 breaks this sealing plate 21 and enters the chamber 16. It's starting to leak out.

Next, the operation of the present invention will be explained.

In the foam fire extinguishing system E of the present invention, when the rotating member 20 is not in operation, the rotating member 20 is attracted and restrained by the magnet 24 and the third
As shown in the figure, it is in a vertical state facing the end 17a of the bubble discharge port 17. When using the foam fire extinguishing device E, the pump 11 is operated from this state as in the conventional case. Then, the air foam stock solution (for example, 3~
5% hydrolyzed protein solution) and water are mixed at a predetermined ratio using a mixing device, etc., and the extinguishing liquid is
It enters the riser pipe 12 through the buffer device 14, strainer 13, etc., and is supplied to the air form maker 15. Here, the air is sucked in and becomes fire extinguishing foam, which breaks the sealing plate 21 and flows out into the chamber 16, and also enters the foam discharge port 17 and hits the rotating member 20. At this time, the rotating member 20 is rotated by the outflow pressure of the fire extinguishing foam against the attraction force of the magnet 24 until its upper end 20b hits the stopper 19, and the lower end 20c side protrudes inward from the side wall 10c of the storage tank 10. . The fire extinguishing foam flows downward along the plate surface of the rotating member 20, and the fire is extinguished.

In this way, the rotating member 20 of the foam fire extinguishing device E is
When the foam fire extinguishing device E is inactive, it is in a vertical state facing the end 17a of the foam discharge port 17, and is positioned outward from the side wall 10c of the storage tank 10, so that it can be protected against earthquakes, etc. Floating roof 1 due to liquid level fluctuation
0a swings up and down a lot, and a part of it swings up and down to the side wall 1.
Even if it moves to the part where the bubble outlet 17 of 0c is arranged, it will not collide with this floating roof 10a. Furthermore, when the foam fire extinguishing device E is activated, the rotating member 20 is moved to the side wall 1 by the pressure of the fire extinguishing foam.
The fire extinguishing foam is rotated until it protrudes inward from 0c, correcting the direction in which the fire extinguishing foam is released, so that the fire can be extinguished reliably.

Note that the magnet 24 may be provided on the rotating member 20 side, and in that case, the rotating member 20 can be formed of a material other than a metal material.

FIGS. 4 to 9 show several other embodiments of the present invention, which will be explained in order below.

FIG. 4 shows how this magnet 24 is connected to the end 1 of the foam outlet 17.
An example of the arrangement in 7a is shown. Of course, in this case as well, the magnet 24 may be provided on the rotating member 20 side. In addition, the installation part of the magnet is shown in Figure 3.
The action is not limited to the illustrated position in FIG. 4, but is an action in which the rotating member is attracted and rotated outward from the side wall by magnetic force around the fulcrum on the side wall, the rotating member, or the foam release means, and is restrained and held. Any position that allows you to play is fine.

Further, in the embodiments shown in FIGS. 5 to 8, the side plate 2
5a and whose lower end 25b is inclined at a predetermined angle toward the foam discharge port 17.
A magnet 26 is attached to the outer surface of the side wall 10c of the storage tank 10.
c, so it will not rotate unnecessarily during an earthquake, and since the rotating member 25 is formed into a substantially cylindrical shape, the fire extinguishing foam released from the foam outlet 17 when extinguishing a fire will not rotate unnecessarily during an earthquake. Allows for smooth flow down the cylindrical channel. Further, in FIG. 9, a magnet 27 is attached to the end 17a of the bubble discharge port 17 via a fitting 28.

By the way, in the above, the foam fire extinguishing device E was installed in the floating roof type storage tank 10 provided with the fixed roof 10b, but it can also be used in a floating roof type storage tank without a fixed roof. In this case, the chamber 16 may not be particularly provided. Further, the foam outlet 17 may be formed in a backboard attached to the side wall 10c of the storage tank 10, in which case the rotating member 20
is the side wall 10c of the storage tank 10 when extinguishing foam is released.
It suffices if it is rotated inwardly and protruded from a virtual side wall extending upward (the concept of the virtual side wall is also included in the term "side wall").

Further, in the above case, the rotating member 20 was rotated by the discharge pressure of the fire extinguishing foam, but the rotating member 20 was mechanically or electrically rotated by the operation of the raw solution pump 11 or the detection signal of the fire extinguishing foam, etc. It can be configured to be rotated.

As described above, according to the present invention, the rotating member is retracted outward from the side wall of the storage tank when the fire extinguishing foam is not being released, and rotates inward and protrudes from the side wall of the storage tank only when the fire extinguishing foam is being released. Since the direction in which the fire extinguishing foam is released is changed, even if the floating roof is shaken up and down due to an earthquake or the like, the floating roof will not be damaged, and the floating roof will not be damaged.

Further, since the rotating member is always held rotatably around the pin as a fulcrum, it can reliably function as a deflector when the fire extinguishing liquid is released. Furthermore, the rotating member is securely held outside the side wall of the tank by magnetic force during normal operation, and will not protrude into the tank during an earthquake, making it safe. Since a magnetic force is applied in addition to the rotation due to the weight of the moving member, it is effective to quickly return to its original state without any complicated measures.

[Brief explanation of drawings]

FIGS. 1 and 2 are sectional views of the main parts of a conventional foam fire extinguishing system, and FIG. 3 is a side view of the main parts of an embodiment of the present invention. Furthermore, FIGS. 4 to 9 show other embodiments of the present invention, in which FIGS. 4 and 5 are side views of main parts, and FIG. 6 is a sectional view taken along the - arrow in FIG. , Figure 7 is the fifth
A cross-sectional view taken along the arrow -, and FIGS. 8 and 9 are side views of main parts. 10...Storage tank, 10a...Floating roof, 10c...
Side wall, 17...Bubble discharge port, 18...Support member, 1
9... Stopper, 20... Rotating member, 20a...
Pins, 24, 26, 27...magnets.

Claims (1)

[Claims] 1. A floating roof in which a foam discharge means is formed on the side wall of a floating roof type storage tank by supporting a foam discharge port on a support member fixed to the outer surface of the side wall, and extinguishing foam is discharged from the foam discharge port to extinguish the fire in the storage tank. In a foam fire extinguishing system in a storage tank, the foam discharge means is provided above the highest liquid level in a flat state of the liquid stored in the storage tank,
A rotating member is disposed near the foam discharge port and rotates inward from the side wall of the storage tank around a pin to change the discharge direction of the fire extinguishing foam only when the fire extinguishing foam is released. A magnet is installed on either the foam discharge means or the rotating member, and the magnet rotates the rotary member around a pin by suction force and restrains it on the outside of the storage tank side wall, and A foam fire extinguishing system for a floating roof type storage tank, characterized in that a member stopper is provided.