JPH07108B2 - Fire extinguishing nozzle for powder fire extinguishing equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fire extinguisher nozzle for powder fire extinguishing equipment. More specifically, the present invention relates to a fire-extinguishing nozzle for uniformly spraying a fire-extinguishing agent over the entire area of a fire-extinguishing target in a powder fire extinguishing system of the whole-area discharge type.

○ Conventional technology For fixed-type fire extinguishing equipment that uses powder fire extinguishing equipment, only the local emission method that partially extinguishes the fire has been put into practical use, and the all-extinguishing method has been mostly used. Absent.

FIG. 11 shows an example of a conventional fire extinguishing nozzle, and FIG. 12 shows the pattern to be extinguished. In FIG. 11, the fire extinguishing nozzle body 21
A taper inner thread 22 is formed on the inlet side of
To be able to connect. A cylindrical portion 23 is formed on the inside of the outlet side, a nozzle tip 24 having a shape combining a cylinder and a cone is fitted therein, and a set screw 25 is used to prevent the fire extinguishing nozzle body 21 from coming off. . Cylindrical part 23
The tip extension is further processed into an outwardly open conical shape with an angle β, and an orifice hole 26 is opened perpendicularly to the conical surface of the nozzle tip 24 at a position facing the inner surface thereof. With the above shape, the angle γ of the conical surface 24a of the nozzle tip 24 becomes the radiation angle of the powder fire extinguisher injected from the orifice port 26 as it is, but a part of the fire extinguishant has a conical surface forming the angle β. It collides with 23a, faces the direction of arrow X in the figure, and
A part of the extinguishant goes straight in the direction of the angle γ and goes in the direction of the arrow Y, and as a result of these intersecting and interfering with each other, the conical powder radiation pattern represented by the angle α shown in FIG. 12 is formed. .
In this case, the effective range for extinguishing is limited to the inside of the conical pattern of angle α in FIG. 12, and the angle α is
11 The angle β of the conical surface 23a and the conical surface 2 of the nozzle tip 24
It depends on the angle γ of 4a.

Problems to be Solved by the Invention The conventional fire extinguishing nozzle described above has the following problems.

(1) When the mounting height of the fire extinguishing nozzle from the floor is H and the extinguishable area of the floor is A, the volume V of the space to be extinguished should be V = AH However, since the actual extinguishable volume V'is limited to the inner surface of the conical surface with the angle α, referring to Fig. 12, V '= 1/3 · AH, and the remaining two thirds of the volume The part cannot be extinguished.

(2) Reduce the angle γ in the fire extinguishing nozzle of Fig. 12,
When the angle β is increased, the cone angle α is increased, but the radiation angles X and Y also spread outward, so that the distribution of the radiated powder extinguishant becomes a donut shape in which the powder extinguishant is densely distributed around the outer periphery of the cone. On the contrary, it becomes difficult to extinguish the fire in the center part due to the "blind phenomenon".

(3) In any case, as the upper part of the fire extinguishing target section near the ceiling, that is, the inner surface perpendicular to the fire extinguishing nozzle, becomes farther from the fire extinguishing nozzle, it becomes more difficult to extinguish the fire.

Further, the conventional fire extinguishing nozzle can be used only for the local discharge method as described above, even though there are some differences in structure and shape, and there is a problem with the installation standard based on the provisions of the law.

In local fire extinguishing equipment, for example, when using a type 3 powder extinguishing agent, the target extinguishing area is 1 m ³
Amount of at least 0.88 kg is required per
Article 21 paragraph 3 item 2)), but on the other hand, in the case of whole area release method, it is set to 0.36 kg or more per the same volume (Article 21 item 3 item 1 a of Article 21 of the Fire Service Act Enforcement Regulations) Therefore, the amount of powder extinguishing agent required for the local release method is about the same as that for the global release method.
It has reached 2.5 times. Therefore, in the case of the local discharge method, it is possible to easily extinguish a fire even with a fire extinguishing nozzle having a considerable unevenness in the powder fire extinguishant distribution as described in (2) above. Moreover, as can be seen in FIG. 12, in order to cover the entire target section, the area A must be reduced, and in that case, the amount of powder extinguishing agent has the disadvantage that the ratio becomes the largest. is there.

Therefore, when these general local emission fire extinguishing nozzles are used for the global emission emission method, the fire extinguishing agent is provided in a much larger amount than the minimum amount required by law, or
There is a problem in that the amount of extinguishing agent must be in accordance with the law and a large number of extinguishing nozzles must be arranged in the compartment so as to cover the entire space.

[Means for Solving the Problems] The present invention is configured such that the inner surface of the nozzle body is composed of a cylindrical surface near the inlet and a conical surface near the tip, and a plurality of first orifice holes are formed at right angles to the cylindrical surface to form a cone. Seconds at right angles to the plane
The orifice hole is bored, and the tip of the nozzle body located below the second orifice hole is positioned so as to intersect with the axial extension lines of the plurality of second orifice holes of the conical surface (the axial core thereof is In a plan view, the plurality of diffusing rods are radially projected so as to substantially coincide with the axial center extension line of the second orifice hole.

○ Action The powder fire extinguishing agent emitted from the first orifice hole of the cylindrical surface on the side near the entrance of the fire extinguishing nozzle body covers the horizontal surface below the ceiling of the compartment to be extinguished and below it, and the The powder fire extinguishing agent emitted from the two orifice holes collides with the diffusion rod at an angle θ, and covers a wide spatial range obliquely downward while sufficiently diffusing. In this case, the diffusion action by the diffusion rod is caused by the air flow colliding with the rod and being significantly disturbed, and is due to the mixed flow of the gas containing the powder extinguishing agent and the solid.

Examples Hereinafter, the present invention will be described based on Examples shown in the drawings.

Referring to FIGS. 1 to 3, a taper screw 2 is formed at the entrance of the fire extinguishing nozzle body 1 so that the fire extinguishing equipment pipe 20 can be connected. The inside of the side close to the inlet is formed into a cylindrical surface 3,
From the outside thereof, a plurality of first orifice holes 4, 4, ... Are drilled at right angles to the cylindrical surface 3. Conical surface 5 on the side far from the entrance
, And a plurality of second orifice holes 6, 6 ... Are drilled from the outside toward the inside at a right angle to the conical surface 5. At the tip of the fire-extinguishing nozzle body 1, that is, below the orifice holes 6 ...
The same number of diffusion rods 7, 7, as the second orifice holes 6, 6,
The fire extinguishing nozzle main body 2 is mounted radially in a direction perpendicular to the axis center of the fire extinguishing nozzle body 2.
Are arranged on the center line 8 of 6 ..., That is, the axis of the diffusion rods 7 ... Is aligned with the axis extension line of the second orifice hole in the plan view of the nozzle body. Inner threads are processed on the base portion 9 of the diffusion rods 7, ..., And the screw is fixed to the screw 10 at the tip of the fire extinguishing nozzle body 1.

In FIG. 1, θ is an angle between the center line of each of the opposing second orifice holes 6 and the axis of the diffusion rod 7 (the side of the nozzle body and the second axis of the diffusion rod 7 when viewed from the front). It is the angle of intersection with the extension of the axis of the orifice hole.

Next, the radiation of the powder fire extinguishing agent and its distribution will be described.
The powder fire extinguisher is mixed with nitrogen gas (N2 gas) having a pressure of around 10 kg / cm2, and while flowing, flows in the fire extinguishing equipment pipe 20 in a gas / fixed multiphase flow state, and enters the fire extinguisher nozzle body 1. Reaching the first orifice holes 4 and the second orifice holes 6 and 6, and is ejected into the atmosphere together with N2 gas. Hereinafter, the case of the first orifice holes 4, 4, ... And the case of the second orifice holes 6, 6 ,.

The powder extinguishing agent ejected from the first orifice holes 4 ...
It is radiated in a relatively narrow angle range, but that state is 4A
Shown in Figure and Figure 4B. Since the powder fire extinguisher is an extremely fine solid with a size of 10 μm to 100 μm, it loses momentum during ejection as it moves away from the fire extinguishing nozzle, and as shown in the side view of FIG. 4A (the same applies to the front view), The pattern gradually subsides, while on the other hand, in plan view, it becomes a completely symmetrical pattern as shown in Fig. 4B.

Next, even in the case of the powder fire extinguishing agent ejected from the second orifice holes 6, 6, if the radiation pattern as shown in FIG.
Since the diffusion rods are located in the immediate vicinity of 6 ..., they will spread widely.

That is, as shown in FIG. 7A, the N2 gas ejected from the second orifice holes 6, 6 ... Is disturbed in the air flow by the diffusion rods 7, 7, ... As a result, the powder fire extinguishing agent is as described above. Since it is an extremely fine solid that is easily affected by airflow, it will spread over a wide range, as shown in Figure 7B, such as rebound, mutual interference between powder fire extinguishing agents, and wraparound. The degree of the influence of this air flow is that the center line 8 of the second orifice hole 6 forms an angle θ with the diffusion rod 7,
It is remarkable as it is closer to the second orifice hole 6. As a result, the degree of diffusion of the powder fire extinguisher near the axis of the fire extinguisher nozzle, that is, near the center of the space, is increased, and the so-called "blank phenomenon" of the powder fire extinguisher is eliminated. This state is shown in FIG.

Therefore, it is clear that the total space radiation pattern of the fire extinguishing nozzle of the embodiment of the present invention shown in FIG. 1 is a combination of FIG. 4A, FIG. 4B and FIG. 6, and as shown in FIG. By using the fire extinguisher nozzle of the invention, the space to be extinguished can be completely covered with the powder extinguishing agent.

FIG. 9 shows another embodiment of the present invention, in which the tip of the fire-extinguishing nozzle body 1 is formed into a quadrangular prism, a hexagonal prism, etc., and a part of the base portion 9 is a quadrangular hole of a corresponding type, a hexagonal prism. After processing into a hole and fitting, it is fixed to the screw hole 11 at the tip of the fire-extinguishing nozzle body 1 with a machine screw 12. By doing so, the fire extinguishing nozzle body 1
When the base portion 9 and the base portion 9 are combined with each other, the work for aligning the center line of the second orifice holes 6, 6 with the axis of the diffusion rods 7, 7 can be omitted. The diffusing rods 7, 7, ... Have a circular cross section in the above embodiment, but as shown in the cross sectional view of FIG. Needless to say, the object of the present invention can be achieved even with an appropriate shape.

<Effect> According to the present invention, the inner surface of the nozzle body is composed of a cylindrical surface near the inlet having a plurality of first orifice holes and a conical surface near the tip having a plurality of second orifice holes. Since the tip of the nozzle body located below is positioned so as to intersect with the axial extension lines of the second orifice holes of the conical surface) and the plurality of diffusion rods are radially projected, The horizontal surface just below the ceiling and below it is covered with the powder fire extinguisher emitted from the first orifice hole of the cylindrical surface on the side close to the entrance of the fire extinguisher nozzle body, and a wide space range diagonally below is covered with the conical surface of the fire extinguishing nozzle. The powder fire extinguishing agent emitted from the second orifice hole of 1 collides with the diffusion rod at an angle θ and sufficiently diffuses to cover it. Therefore, in the powder fire extinguishing equipment of the whole area discharge system, the fire extinguishing agent can be uniformly sprayed over the entire area of the fire extinguishing target, and the powder fire extinguishing agent can be effectively used to surely extinguish the entire area within the predetermined space.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fire extinguishing nozzle showing an embodiment of the present invention,
Fig. 2 is the same side view, and Fig. 3 shows the left half in AA of Fig. 1.
It is a partial bottom view shown in a section along a section line. 4A and 4B show the radiation pattern of the powder fire extinguishing agent from the first orifice hole, FIG. 4A is a side view (the same is true for the front view), and FIG. 4B is a plan view. FIGS. 5 and 6 are explanatory views of the diffusion state of the powder fire extinguishing agent from the second orifice hole, and FIG. 5 shows the radiation pattern of the powder fire extinguishing agent from the second orifice hole when there is no diffusion rod. , FIG. 6 shows the radiation pattern in the presence of diffuser rods. 7A and 7B are explanatory views of the action of the diffusion rod, FIG. 7A shows turbulence of the air flow due to the diffusion rod, and FIG. 7B shows rebound of the powder fire extinguishing agent due to the turbulence of the air flow, mutual interference and the like. FIG. 8 is a side view (a front view is the same) as a side view showing a whole space radiation pattern of the powder fire extinguisher obtained by synthesizing radiation patterns of both the first orifice hole and the second orifice hole. FIG. 9 is a vertical cross-sectional view similar to FIG. 1 of a fire extinguishing nozzle showing a second embodiment of the present invention, and FIG. 10 is a vertical cross-sectional view taken along the line BB of FIG. 11 and 12 show a known fire extinguishing nozzle, FIG. 11 is a vertical sectional view similar to FIG. 1, and FIG. 12 is a plan view showing a radiation pattern similar to FIG. 1 ... Fire extinguishing nozzle body 3 ... Cylindrical surface 4 ... First orifice hole 5 ... Conical surface 6 ... Second orifice hole 7 ... Diffusion rod

Claims (1)

[Claims] 1. A fire extinguisher nozzle for powder fire extinguishing equipment, wherein the inner surface of the nozzle body communicating with the fire extinguishing equipment pipe is formed into a cylindrical shape, and the inner surface of the end portion is formed into a conical shape, and The inner surface is composed of a cylindrical surface and a conical surface, and a plurality of first orifice holes are formed from the outer wall of the cylindrical surface toward the inside at a right angle to the cylindrical surface, and from the outer wall of the conical surface to the inside at a right angle to the conical surface. A plurality of second orifice holes are formed toward the end of the nozzle body located below the second orifice hole so as to intersect with the axial extension lines of the plurality of second orifice holes formed on the conical surface. A fire extinguisher nozzle for powder fire extinguishing equipment, which is characterized in that a plurality of diffusion rods are radially projected and the powder fire extinguishing agent emitted from the second orifice hole is caused to collide with the diffusion rods to cause a diffusion action.