JPH0446766Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a foam head of a fire extinguishing device that foams fire extinguishing foam and sprays it uniformly over a wide area.

(Prior Art) As a foam head of this type of fire extinguishing system, there is, for example, one described in Japanese Utility Model Publication No. 160/1983. This device is as shown in FIG. 6, where 1 is the foam head main body, 2 is a large cylindrical body provided in the internal space of the foam head main body 1, and 3 is the large cylindrical body 2. A small cylindrical body provided in an internal space 2a, 4 is an adherend having a through hole 4a formed in the center so that the small cylindrical body 3 can be penetrated, 5 is an adherend 4, a large cylindrical body 3, and a foam. A mounting body 6 for integrally mounting the head body 1 is a foaming net attached to the circumference of the lower surface of the mounting body 5.

A cylindrical space 7 is formed between the inner circumferential surface of the foam head main body 1 and the outer circumferential surface of the large cylindrical body 2, and a cylindrical space 7 is formed between the inner circumferential surface of the foam head main body 1 and the outer circumferential surface of the large cylindrical body 2. is introduced into this space 7. This introduced foam extinguishing liquid is further introduced into a plurality of introduction holes 2b formed at the lower part of the peripheral wall of the large cylindrical body 2, but in this case, each introduction hole 2b is tangentially penetrated. , this introduction hole 2b
The foam extinguishing liquid that has passed is sent into the large cylindrical body 2 while swirling. Therefore, the foam extinguishing liquid inside the large cylindrical body 2 rotating in this way flows through the through hole 4a of the adherend 4.
leading to. The inner circumferential surface of the through hole 4a of the adherend 4 has a tapered first tapered surface 4a' at the top and a second tapered surface 4a'' whose diameter gradually increases downwardly at the bottom. The swirling foam extinguishing liquid collides with the foaming net 6 while being widely diffused by the second tapered surface 4a''. Then, the diffusion state is further expanded by this foaming net 6, and foam is sprayed onto the fire extinguishing material.

On the other hand, the remaining foam fire extinguishing liquid supplied from the upper end opening of the foam head main body 1 is introduced into the introduction hole 3a formed in the upper end peripheral wall of the small cylindrical body 3.
It is sent into the columnar space 3b inside. This fed foam fire extinguishing liquid travels straight downward and collides with the foaming net 6. Due to this collision, the foam fire extinguishing liquid foams and is ejected straight towards the extinguishing object.

(Problems to be solved by the invention) By the way, in such a foam head, a small cylindrical body 3 is provided in the center in order to extinguish the fire evenly toward the center as well as the surrounding area. , the foam extinguishing liquid is injected in a straight line from the columnar space 3b toward the foam net 6. In this case, since the foam extinguishing liquid is injected in a straight line, the foam extinguishing liquid is injected toward the center. Between the fire extinguishing foam and the foam fire extinguishing fluid that is diffused and sprayed in the surrounding direction, there are likely to be dead areas where the foam fire extinguishing fluid is not sprayed very much, so the foam fire extinguishing fluid can be sprayed evenly from the center to the periphery to effectively extinguish the fire. It was still not enough to do so.

The present invention was developed in view of these circumstances, and its purpose is to be able to sufficiently diffuse the fire extinguishing foam over a wide area, and to spread the foam evenly from the center to the periphery. An object of the present invention is to provide a foam head of a fire extinguishing device capable of injecting a fire extinguishing liquid.

(Means to Solve the Problems) In order to achieve the above object, the foam head of the present invention has a substantially cylindrical guide inserted from above into a through hole penetrating in the axial direction formed in the center of the foam head body. The main body of the deflector having an umbrella-shaped disk at the lower end of the cylindrical body is sequentially provided to form a cylindrical space between the inner circumferential surface of the through hole of the foam head main body and the outer circumferential surface of the main body of the deflector. A plurality of spiral introduction holes passing through the guide body in the axial direction are formed in the outer circumferential portion of the guide body, and the space portion and the inner space of the main body of the deflector are connected in series. The umbrella-shaped disk is positioned a predetermined distance below the lower end surface of the through-hole of the foam head body, and is formed to extend radially outward from the through-hole of the foam head body. A through hole communicating with the space is formed, and between the inner circumferential surface of the lower end of the through hole of the foam head body and the outer circumferential surface of the main body of the deflector, the foam fire extinguishing liquid introduced into the space is spread out. A tapered hole is provided to cause the liquid to be ejected and also to collide with the umbrella-shaped disk.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In Figures 1 and 2, 11 is the foam head main body, 12 is the guide body, 13 is the deflector, and 14 is the foam head body.
is a foaming net.

The foam head main body 11 has a through hole 11a that penetrates in the axial direction in the center part, and a threaded part 11b that is screwed into the foam fire extinguishing liquid supply pipe on the upper outer peripheral surface.
An umbrella-shaped flange 11c is formed on the outer circumferential surface of the lower end portion, and the flange 11c has an annular groove 11d that slopes outward around the lower surface of the flange 11c. The outer periphery of the foaming net 14 is fitted onto the outer peripheral edge of the foaming net 14.

As shown in FIG. 2, the guide body 12 has a cylindrical mounting portion 12 having a threaded portion 12c for attaching a deflector at the center of the lower surface of a cylindrical main body 12a.
b is integrally formed, and the outer peripheral part of the main body 12a has a spiral introduction hole 1 that penetrates in the axial direction.
A plurality of 2d are formed at equal intervals. and,
As shown in FIG. 1, this guide body 12 is inserted into the upper end of the through hole 11a of the foam head main body 11 from above and is fitted by caulking the upper end peripheral wall of the foam head main body 11 at required points. There is. Incidentally, this fitting may be performed by press-fitting the guide body 12 into the upper end portion of the through hole 11a of the foam head main body 11.

The deflector 13 has a cylindrical main body 13a with a female thread 13b carved on the inner peripheral surface of the upper end thereof. It is provided in the through hole 11a by being screwed onto the threaded portion 12c. In this state, a cylindrical space 15 is formed between the inner peripheral surface of the through hole 11a of the foam head main body 11 and the outer peripheral surface of the main body 13a.
The space 15 communicates in series with the outer half 12d' of each introduction hole 12d, and the inner half 12d'' of each introduction hole 12d communicates with the inner space of the deflector 13. 13' and communicated in series.

Further, the lower end of the deflector 13 projects a predetermined distance downward from the lower end surface of the through hole 11a of the foam head main body 11, and the through hole 11a
An umbrella-shaped disk 13c is formed extending radially outward from a, and in the center of the disk 13c, an upper side has a circular hole 13d' with the same diameter and a lower side has a tapered hole 13d'' whose diameter gradually increases. Drilled through hole 13
d.

In addition, 16 in the figure is a tapered hole formed so that the foam extinguishing liquid ejected from the space is ejected in a widening shape and collides with the umbrella-shaped disk 13c.
Reference numeral 17 denotes a recess for engagement with an installation tool when the foam head main body is screwed onto the foam fire extinguishing fluid supply pipe using an installation tool.

With the above configuration, the foam fire extinguishing fluid pressure-fed from the foam fire extinguishing fluid supply pipe is given a swirling motion by each introduction hole 12d of the guide body 12, and flows into the space 15. It is fed into the interior space 13' of the deflector 13 in two directions. This fed fire extinguishing foam fluid on the side of the space 15 is directed toward the tapered hole 16 while performing a swirling motion, and after passing through the tapered hole 16 is appropriately dispersed, the foam is further dispersed into the disc 13c of the deflector 13.
The particles collide with each other and become fine particles, and are further actively dispersed outward. Then, the foam extinguishing liquid produced in this manner collides with the foaming net 14 and is foamed and sprayed around the foaming net 14.

On the other hand, the foam extinguishing liquid sent into the internal space 13' side of the deflector 13 moves toward the through hole 13d while performing a swirling motion, and is appropriately dispersed by passing through the through hole 13d, and then flows into the foaming net 14. They collide and foam is ejected toward the center.

In this case, the space 15 is connected to the inner peripheral surface of the through hole 11a of the foam head main body 11 and the deflector 13.
Since the fire extinguishing foam is formed in a cylindrical shape between the outer circumferential surface of the space 15 and the fire extinguishing foam, the fire extinguishing foam that rotates within the space 15 is guided downward to the tapered hole 16 side without any loss of swirling force. , This guided foam fire extinguishing liquid has a swirling force that is not weakened, and the tapered hole 1
6, it is possible to eject effectively in a shape that spreads toward the end. Moreover, the disk 13c of the deflector 13
is formed to extend radially outward from the through hole 11a of the foam head main body 11, so the foam extinguishing liquid spouted out in a widening shape collides with this disk 13c, becomes fine particles, and further outwards. can be dispersed into Therefore, by making the particles finer and promoting dispersion, the foam extinguishing liquid foamed from the foaming net 14 can be sprayed over a considerably wide range.

On the other hand, the foam extinguishing liquid injected toward the center is transmitted through the spiral introduction hole 12 formed in the guide body 12.
Since the turning force is applied by d..., it reaches the internal space 13' of the deflector 13, and the through hole 13
The foam extinguishing liquid emitted from d can be dispersed as appropriate. Therefore, the foam extinguishing liquid foamed from the foaming net 14 is not simply injected in a straight direction;
Foam can be sprayed toward the center in a somewhat dispersed state.

As described above, in the case of the above embodiment, the foam extinguishing liquid can be sprayed over a wide range in the peripheral direction, and the foam can also be sprayed uniformly from the center to the periphery. be.

According to the experiment, the disk 1 of the deflector 13
The outer diameter B of the disk 3c is set to 1.5 to 1.8 times the diameter of the space 15, and the disk 13 relative to the main body 13a is
Set the angle C of c to 90° to 120°, and then open the through hole 1.
The aperture D of 3d is the internal space 1 of the deflector 13.
It has been found that the distribution from the center to the periphery is most uniform when the ratio is set to about 1:7 with respect to the 3' aperture. By the way, when the results of this experiment are plotted, as shown in Figures 4 and 5, when the foam head is placed at a predetermined height and the foam fire extinguishing liquid is foamed and injected from there, it is different from the conventional method. With foam head c, the unevenness is more pronounced than the uniform foam distribution when ideal foam head b is assumed, but when foam head a of the above example is used, the foam distribution is almost uniform. At first glance, it is clear that the uniform distribution is excellent.

(Effects) As can be easily understood from the above explanation, the foam head of the present invention guides the swirling foam fire extinguishing liquid from the space to the tapered hole so that the swirling force is not weakened. By ejecting the foam in a widening shape through the tapered hole and colliding with the disk of the deflector, the foam can be sprayed over a sufficiently wide area, and the foam can also be sprayed toward the center. By applying the swirling motion, the fire extinguishing foam can be sprayed uniformly from the center to the periphery, which is extremely effective.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is a longitudinal sectional view, Figure 2a is a perspective view showing the guide body and deflector, and Figure 2b is a deflector and a guide body. Perspective view showing the state in which it is attached to the 3rd
The figure is a schematic sectional view, FIGS. 4 and 5 are explanatory diagrams showing the experimental implementation status of the foam head according to the present invention, and FIG. 6 is a longitudinal sectional view showing a conventional example. 11... Foam head main body, 11a... Through hole of foam head main body, 12... Guide body, 12d... Introduction hole, 13... Deflector, 13'... Inner space of deflector, 13c... Disc of deflector, 13d...Through hole, 15...Space, 16...
...Tapered hole.

Claims (1)

[Scope of utility model registration request] The main body of the deflector having a substantially cylindrical guide body and an umbrella-shaped disk at the lower end of the cylindrical body is sequentially provided from above in a through hole formed in the center of the foam head body and penetrating in the axial direction. A cylindrical space is formed between the inner peripheral surface of the through hole of the foam head main body and the outer peripheral surface of the main body of the deflector, and a plurality of spiral introduction holes penetrating in the axial direction are formed in the outer peripheral part of the guide body. The space is connected in series with the internal space of the deflector main body, and the umbrella disc of the deflector is positioned a predetermined distance below the lower end surface of the through hole of the foam head main body. A through hole is formed in the center of the umbrella-shaped disk to extend radially outward from the through hole of the deflector, and a through hole communicating with the inner space of the deflector is formed in the center of the umbrella-shaped disk, and the inner circumferential surface of the lower end of the through hole of the foam head body is formed. A fire extinguishing device characterized in that a tapered hole is provided between the deflector and the outer circumferential surface of the main body, through which the foam fire extinguishing liquid introduced into the space is ejected in a divergent shape and collides with the umbrella-shaped disk. Foam head of the device.