JPH0475019B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a foam generator for foam fire extinguishing equipment for petroleum tanks.

[Conventional technology]

Foam fire extinguishing equipment installed in oil tanks has a foam generator attached to the upper side wall of the tank.
When a fire occurs, extinguishing foam is released to cover the fire and extinguish it.

[Problem that the invention seeks to solve]

The conventional foam generator for foam extinguishing equipment for petroleum tanks as described above has a nozzle and an intake port for discharging the foam solution at the end of the foam solution supply path, and a foaming chamber is further provided through the liquid supply pipe. However, due to the structure of such a foam generating device, a predetermined distance must be maintained between the nozzle and the air intake port and the foaming chamber, which results in a large device.
Since the structure is complicated, it has the disadvantage of being expensive.

[Means for solving problems]

In view of the above points, the present invention forms a casing corresponding to the foaming chamber with a front plate, a back plate, a top plate, and both side plates, and has an air inlet in the back plate and the air inlet at approximately the center of the air inlet. A nozzle installed to spray foam solution toward the front plate or top plate.
Further, each has a deflector protruding from the front plate or the upper plate facing the nozzle, and the lower part of the front plate is bent inwardly, and the lower end of the rear plate and the bent portion are bent. By forming a foam discharge port on the lower surface of the housing by the edge, the foam solution is injected from the nozzle toward the deflector and atomized, and at the same time, air is sucked in from the intake port at any time. The foam is then mixed with the atomized foam solution to produce fire extinguishing foam of uniform size and high quality.

[Effect]

By configuring as described above, a foam generating device that is small in size, has a simple structure, and can generate high quality fire extinguishing foam can be obtained at low cost.

[Embodiment] An embodiment of the bubble generating device according to the present invention will be described below with reference to the drawings. In FIG. The face plate 5, the stepped portions 6 formed at the stepped portions of the back plates 3 and 3', and the front plate 2.
It is formed by a bent part 2' whose lower part is bent inwardly, and an intake port 7 is formed in a stepped part 6.
Further, bubble discharge ports 8 formed by the back plate 3' and the lower edge of the bent portion 2' are provided. A planar deflector 9 is provided inside the top plate 5 so as to protrude from the top plate 5,
Further, a nozzle 11 attached to a foam solution supply pipe 10 is provided at approximately the center of the intake port 7 formed in the stepped portion 6, facing the deflector 9.

Next, its operation will be explained. When the foam solution supplied from the foam solution supply pipe 10 is injected into the casing 1 from the nozzle 11, the foam solution is radially diffused by the deflector 9, and further spreads onto the front plate 2 and the back plate 3.
The liquid then bounces off the side plates 4 and collides with each other to be agitated and atomized. When the foam solution is injected from the nozzle 11, the suction port 7
When air is sucked into the housing 1 from above and the foam solution is diffused as described above, the air is mixed with the foam solution while being stirred and foamed, and fire extinguishing foam is generated and the foam is discharged from the foam outlet. Released from 8. As mentioned above, when the foam solution is injected from the nozzle 11, the foam solution is radially diffused by the deflector 9 facing the nozzle 11, but the deflector 9 Since the sprayed foam solution is radially diffused by the deflector 9, it does not rub the inner surface of the top plate 5 as in the case where the deflector 9 is not provided, and directly hits the front plate 2. Since the bubble solution is applied to the back plate 3 and both side plates 4, the flow rate of the foam solution does not decrease, and stirring and mixing are performed strongly. In addition, since the bubble outlet 8 is formed by the back plate 3' and the lower edge of the bent portion 2' as described above, its opening area is gradually narrowed down by the bent portion 2', and the opening area is gradually narrowed down by the bent portion 2'. The pressure inside the housing 1 is increased, whereby the fire extinguishing foam generated within the housing 1 is pressed against each other and becomes uniform in size and of good quality.

Note that in the embodiment shown in FIG.
Although the nozzle 11 is oriented vertically, the nozzle 11 may also be oriented horizontally.An embodiment in that case will be explained with reference to FIG. 2.The difference from FIG. The related parts are slightly different, but the basics remain the same, except that the deflector 9 is provided on the front plate 2, and the intake port 7 and nozzle 11 are provided on the back surface 3 without a step. This is exactly the same as in Figure 1. In this case, the deflector 9 is tilted slightly upward from the direction toward the nozzle 11, which is because when the foam solution injected from the nozzle 11 hits the deflector 9, it is radially diffused and further hits each surface and bounces back. However, in the case of Fig. 2, there is no surface for repelling in the downward direction of the diffusion direction, so it is more effective to make the diffusion distribution of the foam solution biased upward, so it is tilted. However, even if it is not tilted, the effect will not be significantly reduced. In the case of inclination, the degree of inclination is preferably within about 30 degrees, considering the angle of diffusion of the foam solution in other directions, which also affects the foaming effect of the fire extinguishing foam.

〔Effect of the invention〕

As described above, the present invention includes a casing having a front plate, a back plate, a top plate, and both side plates and having a bubble outlet on the bottom surface, an air intake port provided on the back plate of the casing, and an air intake port provided on the back plate of the casing. A nozzle provided approximately in the center of the mouth to inject foam solution toward the front plate or top plate, and a deflector protruding from the front plate or top plate facing the nozzle. The lower part of the front plate is bent inwardly, and the foam outlet is formed by the back plate and the lower edge of the bent part, and the foam solution is injected from the nozzle toward the deflector. At the same time, air is sucked in from the intake port and mixed with the atomized foam solution to generate fire extinguishing foam. The foam generating device for the foam fire extinguishing equipment for tanks can be obtained at low cost, and the foam outlet is formed by the back plate and the lower edge of the bent part where the lower part of the front plate is bent inward. The opening area is gradually narrowed down by the bending portion, increasing the pressure inside the casing, and has the excellent effect of producing fire extinguishing foam of uniform size and high quality.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view showing another embodiment. 1...Housing, 2...Front plate, 3, 3'...Back plate, 5...Top plate, 6...Uneven part, 7...Intake port, 8...Bubble outlet, 9...Deflector , 10...
...Foam solution supply pipe, 11...nozzle.

Claims (1)

[Scope of Claims] 1. A casing having a front plate, a back plate, a top plate, and both side plates and having a bubble discharge port on the bottom surface, an air intake port provided on the back plate of the casing, and the air intake port. A nozzle is provided approximately in the center of the panel to inject a foam solution toward the front plate or top plate, and a deflector is provided to protrude from the front plate or top plate and faces the nozzle. A foam fire extinguishing system for an oil tank, characterized in that the lower part of the front plate is bent inwardly, and the foam outlet is formed by the back plate and the lower end edge of the bent part. Foam generator. 2. The petroleum tank foam fire extinguishing equipment according to claim 1, wherein the back plate has a stepped portion substantially parallel to the top plate, and the stepped portion is provided with an intake port and a nozzle. Foam generator.