JP4757556B2 - Fire extinguishing nozzle - Google Patents

Description

  The present invention relates to a fire extinguishing nozzle used in a fire extinguishing apparatus or the like for monitoring a machine tool or the like.

In the case of low flash point oil fires such as n-heptane fires that occur at the installation site of machine tools etc., extinguishing with extinguishing water is dangerous, so extinguishing with inert gas such as argon, nitrogen, carbon dioxide etc. It has been broken.
However, in this gas fire extinguishing, since the gas discharge distance is proportional to the gas discharge pressure, to obtain the required discharge distance, the gas discharge pressure must be increased, and the released gas is in progress. Since it is diluted by mixing with air, the concentration decreases. Therefore, it becomes difficult to reliably supply a gas having a sufficient concentration to the object to be extinguished.

  Therefore, in order to solve the above problem, a fire extinguishing method for discharging a gas fire extinguishing agent using water as a carrier has been developed. This fire extinguishing method is, for example, a method of extinguishing a fire while putting a gas fire extinguishing agent in the water film using a radiator capable of releasing water while forming a water film (see, for example, Patent Document 1).

WO01 / 056658

In the conventional example, the straightness of the released gas is not good, and the gas discharge distance cannot be secured sufficiently.
Therefore, it is difficult to extinguish efficiently and reliably.

  In view of the above circumstances, an object of the present invention is to improve the straightness of emitted gas.

The present invention is a discharge cylinder having one end closed and the other end serving as a discharge port, and an inert gas discharge tube provided with a gas pipe hole; and a plurality of tubes disposed outside the discharge port A water spray nozzle; and an inert gas discharge nozzle that communicates with the gas piping hole is provided inside the discharge cylinder, and the inert gas is a nozzle of the inert gas discharge nozzle. It is discharged from the hole toward the cylindrical wall of the inert gas discharge cylinder , the plurality of water spray nozzles are disposed on the outer front side of the discharge port, and a rectifying plate is fitted to the discharge port. To do.

  In this invention, the water discharge patterns of adjacent water spray nozzles overlap to form an annular water discharge pattern, and the gas flow path formed in the annular water discharge pattern has a smaller cross-sectional area as it approaches the floor surface. An inert gas released from the gas passes through.

  Since the present invention is configured as described above, it is possible to improve the straightness of the emitted gas. Therefore, in the case of a low flash point oil fire such as n-heptane, the inert gas and mist can be reliably supplied to the fire extinguishing target, so the synergistic effect of both can efficiently and reliably Can be extinguished.

An embodiment of the present invention will be described with reference to FIGS.
The fire-extinguishing nozzle 1 includes an inert gas discharge cylinder 3 and water spray nozzles 20, 21, 22, and 23.

The inert gas discharge cylinder 3 is a bottomed cylindrical body formed in a U-shaped cross section. One end of the cylindrical wall 5 is closed by a bottom wall 5a, and the other end is a discharge port 5b.
The inner diameter D of the discharge port 5b is formed to be 50 mm or more. The reason why the inner diameter is set to such a size is to improve the straightness of the discharged gas. The length of the discharge port 5b in the axial direction is shorter than the inner diameter D, for example, 45 mm, and this length is appropriately selected as necessary.

  A rectifying plate 7 is fitted into the discharge port 5b.

  A gas pipe hole 10 is provided in the bottom wall 5 a of the discharge cylinder 3. A gas pipe 11 communicating with the pipe hole 10 is provided outside the bottom wall 5a, and a gas nozzle 12 communicating with the pipe hole 10 is provided inside thereof. The nozzle hole 12a of the nozzle 12 is formed in a direction orthogonal to the nozzle axis direction.

  The piping hole 10 is not necessarily provided in the bottom wall 5a, and may be provided in the cylindrical wall 5 on the bottom wall 5a side, for example. In this case, the nozzle hole of the gas nozzle 12 is formed in the nozzle axis direction.

Four water spray nozzles 20, 21, 22, 23 are provided on the cylindrical wall 5 of the discharge cylinder 3 at equal intervals in the circumferential direction. Accordingly, the nozzles 20 and 21 are arranged point-symmetrically, and the nozzles 22 and 23 are arranged point-symmetrically at positions shifted by 90 ° from the nozzles 20 and 21 in the circumferential direction. Yes. The axes of the nozzles 20 to 23 are arranged in parallel with the axis of the discharge cylinder 3.
In addition, whether or not to arrange the axis of the nozzle and the axis of the discharge cylinder 3 in parallel or how many nozzles are installed is appropriately selected as necessary. For example, the number of nozzles Is selected in the range of 2-12.

  The discharge patterns of the nozzles 20 to 23 are conical, and the discharge pattern angle θ is 60 ° to 120 °. Moreover, although the fire extinguishing water ejected from these nozzles 20 to 23 becomes mist, the average particle size of the mist is configured to be 200 μm or less.

The nozzles 20 to 23 are provided on the outer front side of the discharge port 5b. The distance between the tip of the nozzles 20 to 23 and the discharge port 5b, that is, the separation distance L is within a predetermined range, for example, 200 mm or less. It is suitably selected within the range.
The distance L between the nozzles 20 to 23 is equal, and therefore the tips of the nozzles are aligned. However, the tips of the nozzles 20 to 23 are not necessarily aligned. For example, the separation distance L of the nozzles 20 and 21 is 80 mm, the separation distance L of the nozzles 22 and 23 is 100 mm, and the nozzles 22 and 23 are You may arrange | position ahead of this nozzle 20,21.

Next, the operation of the present embodiment will be described.
The fire-extinguishing nozzle 1 is fixed to the ceiling surface 32 through the mounting bracket 30, and the discharge port 5 b and the nozzles 20 to 23 are placed on the fire-extinguishing target, for example, a machine tool, etc. Turn downwards.

  When a gas discharge facility and a water discharge facility (not shown) are started manually or automatically when a fire occurs, the inert gas G is pumped to the gas pipe 11 and the fire-extinguishing water w is pumped to the water supply pipe 37.

  For example, argon, nitrogen, or carbon dioxide is used as the inert gas G, and is supplied at a rate of 1000 to 5000 L / min. The gas G is discharged from the nozzle hole 12 a of the gas nozzle 12 toward the cylindrical wall 5 through the pipe hole 10. Then, the released inert gas G is collided with the cylindrical wall 5 to change the traveling direction, and straightens in the direction of the discharge cylinder axis while the flow is adjusted by the rectifying plate 7.

The fire extinguishing water w is, for example, ejected from the nozzles 20 to 23 to become mist M. The average particle diameter of the mist M is 200 μm or less, for example, 150 μm. The water spray flow rate of each nozzle 20 to 23 is 5 to 30 L / min., And the water spray discharge pressure is 0.2 to 2 MPa.
The water discharge patterns 20p to 23p of the nozzles 20 to 23 are conical, and a part of the water discharge patterns adjacent to each other overlap to form one annular water discharge pattern as a whole. Therefore, a gas flow path 40 is generated at the center of the annular water discharge pattern.

  As shown in FIG. 5, the water discharge patterns 20p to 23p of the nozzles 20 to 23p have a larger cross-sectional area as they approach the floor surface 40. The cross-sectional area is small.

  Therefore, the inert gas G is prevented from spreading outward on the upper side by the mist, and is mixed with the mist M on the floor 50 side to become a mixed gas GM. Therefore, since a sufficient amount of inert gas G and mist M necessary and necessary are supplied to the object to be extinguished placed on the floor surface 50, the fire can be surely and efficiently extinguished. .

It is a front view which shows embodiment of this invention. It is a bottom view. It is the III-III line expanded sectional view of FIG. It is a bottom view of a water discharge pattern. It is a front view which shows a water discharge pattern.

Explanation of symbols

1 Fire-extinguishing nozzle 3 Inert gas discharge cylinder 5 Cylindrical wall
10 Piping hole
12 Gas nozzle
20 Water spray nozzle
21 Water spray nozzle
22 Water spray nozzle
23 Water spray nozzle
CP ring water discharge pattern G inert gas w fire extinguishing water

Claims (2)

A discharge cylinder having one end closed and the other end serving as a discharge port; an inert gas discharge tube provided with a gas pipe hole; and a plurality of water spray nozzles disposed outside the discharge port And a fire extinguishing nozzle having:
An inert gas discharge nozzle that communicates with the gas pipe hole is provided inside the discharge cylinder,
The inert gas is discharged from the nozzle hole of the inert gas discharge nozzle toward the cylindrical wall of the inert gas discharge cylinder ,
The fire-extinguishing nozzle, wherein the plurality of water spray nozzles are arranged in front of the discharge port, and a flow straightening plate is fitted to the discharge port . The water discharge patterns of adjacent water spray nozzles overlap to form an annular water discharge pattern, and a gas flow path that is formed in the annular water discharge pattern and decreases in cross-sectional area as it approaches the floor surface is discharged from the discharge port. 2. The fire-extinguishing nozzle according to claim 1, wherein an inert gas passes therethrough.

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