JP2014193201A - Foam extinguishing nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foam extinguishing nozzle that can increase an expansion ratio.SOLUTION: A supply port of a foam water solution supply part 2 comprises: a first foam water solution supply port 2a provided at a center part; and a plurality of second foam water solution supply ports 2b provided around the first foam water solution supply part 2a. The first foam water solution supply port 2a is provided with swirling flow forming means 2c for forming a swirling flow to radially release it. The second foam water solution supply ports 2b release the foam water solution in a rod shape.

Description

  The present invention relates to a foam fire-extinguishing nozzle having a foaming function used to extinguish an oil fire or the like.

  Conventionally, a foam fire-extinguishing nozzle that foams and discharges low-expansion (about 5 times) foam has been used to extinguish an oil fire or the like generated in a plant or the like (see Patent Document 1).

Japanese Utility Model Publication No. 62-137049

  In the case of such a foam fire-extinguishing nozzle, there is a desire to fly the foam far away in accordance with the conditions at the site of use such as a plant.

  This invention aims at providing the foam fire-extinguishing nozzle which can raise a foaming magnification in view of the said situation.

  The present invention includes a foam aqueous solution supply unit having a supply port for supplying a foam aqueous solution, an intake port for sucking air by a water force of the foam aqueous solution supplied from the supply port, and an inner diameter of the foam aqueous solution supply unit. A foamed portion having an inner diameter formed to have a large diameter, foamed by mixing the foam aqueous solution and the air, and having an inner diameter smaller than the inner diameter of the foamed portion and foamed by foaming. In the foam fire-extinguishing nozzle having a discharge port for discharging, a supply port of the foam aqueous solution supply unit is provided around a first foam aqueous solution supply port provided in a central portion and the first foam aqueous solution supply port. A plurality of second foam aqueous solution supply ports provided, and the first foam aqueous solution supply port is provided with swirl flow forming means for forming a swirl flow, and swirls the foam aqueous solution. In the form of a radial discharge, and the second Foam solution supply port is a nozzle for foam, characterized in that it is intended to release bubbles solution into a rod.

  Further, the present invention is the foam fire-extinguishing nozzle, wherein the swirl flow forming means is a spiral member having a swirl flow forming portion formed with a spiral surface.

  Further, the present invention is the foam fire-extinguishing nozzle, wherein the second foam aqueous solution supply port is disposed at equiangular intervals around the first foam aqueous solution supply port.

  According to this invention, since the foam aqueous solution can be swirled radially from the first foam aqueous solution supply port, the discharged foam aqueous solution flows while diffusing radially entirely within the nozzle. Combined with the rod-shaped flow of the foam aqueous solution discharged from the second foam aqueous solution supply port, the foam aqueous solution is directed toward the downstream foaming portion while filling the nozzle with the foam aqueous solution without gaps. It can flow. Accordingly, the inside of the nozzle can be brought into a more negative pressure state, and more air can be sucked from the intake port, so that more air can be supplied to the foaming portion, and foaming by the foaming portion can be performed. The magnification can be increased.

  Therefore, according to this invention, the foam fire-extinguishing nozzle which can raise a foaming magnification can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of an embodiment of the present invention, and is an overall view of a foam fire-extinguishing nozzle partially shown in cross section. It is an expanded sectional view of the part of the foam aqueous solution supply part which shows the same as FIG. The same as the above, (a) is an enlarged cross-sectional view of the discharge port portion in FIG. 1, and (b) is an enlarged cross-sectional view of a part thereof.

  An example of the embodiment of the present invention will be described with reference to FIGS.

  First, the whole structure of the foam fire-extinguishing nozzle 1 of this embodiment is demonstrated. The foam extinguishing nozzle 1 is connected to a hose (not shown) for supplying a foam aqueous solution at the base end, foams the foam aqueous solution to be discharged from the tip, and supplies the foam aqueous solution from the base end side. Foam aqueous solution supply unit 2, located downstream of foam aqueous solution supply unit 2, intake port 3 for sucking air by the water flow of the foam aqueous solution supplied from foam aqueous solution supply unit 2, and downstream of intake port 3 A foaming part 4 having an inner diameter formed larger than the inner diameter of the foam aqueous solution supply part 2 and foaming by mixing the foam aqueous solution and air supplied from the upstream side; It has a discharge port 5 that is located on the downstream side and has an inner diameter smaller than the inner diameter of the foaming portion 4 and that discharges bubbles foamed by the foaming portion 4 (see FIG. 1). In addition, the inlet 3 is provided in the side surface of the cylindrical body between the foam aqueous solution supply part 2 and the firing part 3 at equal intervals, and becomes a shape which can inhale air from a side surface.

  In the foam extinguishing nozzle 1, the foam aqueous solution supply unit 2 includes an orifice-shaped foam aqueous solution supply port that discharges the foam aqueous solution supplied from the upstream side and supplies the foam aqueous solution to the downstream side. The mouth consists of a first foam aqueous solution supply port 2a provided at the center and a plurality of second foam aqueous solution supply ports 2b provided around the first foam aqueous solution supply port 2a. In addition, as a swirl flow forming means for forming a swirl flow by the first bubble aqueous solution supply port 2a, a disk-shaped spiral member 2c having a swirl flow forming portion formed with a spiral surface is supplied as the first bubble aqueous solution supply. It is provided so as to cover the inlet on the upstream side of the mouth 2a, and the foam aqueous solution supplied thereby is swirled to discharge radially as shown by the arrow A1, Second foam aqueous solution supply port b has become as to release the rod-like as shown foam solution as an arrow A2 (see FIG. 2).

  In this embodiment, the swirl flow forming means in the first aqueous foam solution supply port 2a is the spiral member 2c, but instead of the spiral foam provided on the inner surface of the flow path of the first aqueous foam solution supply port 2a. It may be a groove or a strip. However, if the spiral member 2c is used, it is not necessary to process the shape of the inner surface of the flow path, so that there is an advantage that the manufacturing cost can be reduced.

  The number of the second foam aqueous solution supply ports 2b is, for example, at least three, preferably four, and the arrangement is the first foam aqueous solution supply port 2a. It may be arranged at equiangular intervals around.

  Here, since the foam fire-extinguishing nozzle 1 can discharge the foam aqueous solution radially from the first foam aqueous solution supply port 2 a in a swirl flow, the foam aqueous solution to be discharged is entirely radial in the flow path of the nozzle 1. In combination with the bubble-shaped flow of the foam aqueous solution discharged from the second foam aqueous solution supply port 2b, the flow path of the nozzle 1 is filled with the foam aqueous solution without any gaps. In this way, the foam aqueous solution can be flowed toward the downstream foaming portion 4. Thereby, the inside of the nozzle 1 can be brought into a more negative pressure state, and more air can be sucked from the intake port 3, so that more air can be supplied to the foaming part 4, and the foaming part The ratio of foaming by 4 can be increased.

  Accordingly, the foam fire-extinguishing nozzle 1 can increase the foaming ratio by discharging the foam aqueous solution from the first foam aqueous solution supply port 2a in a swirl flow and discharging it radially.

  Furthermore, the foam fire-extinguishing nozzle 1 of this embodiment is demonstrated.

  The foam fire-extinguishing nozzle 1 is provided with a net 6 that allows the foam foamed by the foaming part 4 to pass through the discharge port 5 to reduce its diameter.

  Here, since the foam fire-extinguishing nozzle 1 can discharge the foam foamed by the foaming part 4 from the discharge port 5 after the diameter of the foam is made smaller by the net 6, each of the foams discharged from the discharge port 5. The film thickness can be made thicker and it can be made difficult to break the bubbles.

  Accordingly, the foam fire-extinguishing nozzle 1 is provided with a net 6 that allows the foam foamed by the foaming portion 4 to pass through the discharge port 5 to reduce the diameter thereof, thereby reducing the reduction time (drainage) of the foam to be discharged. It can be stretched.

  The following experimental result 1 shows that the reduction time of the foam to be released can be extended by providing a net that allows the foam foamed by the foaming portion to pass through the discharge port to reduce its diameter. In the experiment, an example in which a mesh is not provided at the discharge port as Example 1, and an example in which one mesh is provided at the discharge port is as follows. Example 2: Wire diameter φ0.35 mm, mesh 14 ″, space 1 .46, using a mesh having an aperture ratio of 65%, Example 3: using a mesh having a wire diameter of 0.35 mm, mesh 16 ″, a spatial mesh of 1.24, and an aperture ratio of 61%, Example 4: a line Example 5: Wire diameter φ0.28 mm, mesh 24 ″, space mesh 0.78, aperture ratio 54, using mesh with diameter φ0.28 mm, mesh 16 ″, space mesh 1.31, aperture ratio 68% % 25% reduction time (drainage) was measured under conditions of a temperature of 28 ° C. to 34 ° C. and a water temperature of 20 ° C. to 30 ° C. The net position was 15 mm inward in the axial direction from the mouth of the discharge port.

  The experimental results show that in Example 1 where no net was provided at the discharge port, the 25% reduction time could not be measured (44% reduced in 1 minute), but in any of Examples 2 to 5 The 25% reduction time was 1 minute or longer. In other words, as described above, the experimental result 1 shows that the reduction time of the foam to be released can be extended by providing the net having a smaller diameter by passing the foam foamed by the foaming part at the outlet. It can be said that.

  In addition, as shown in the experimental result 1, it is possible to extend the reduction time of the foam released by providing a net that allows the foam foamed by the foaming part to pass through the discharge port to reduce its diameter. The foaming ratio of the foam will decrease. However, like the foam fire-extinguishing nozzle 1 of the present embodiment, the foam aqueous solution should be discharged radially from the first foam aqueous solution supply port 2a, and the foaming ratio can be increased. The reduction in the expansion ratio can be suppressed.

  Further, in the present embodiment, the foam fire-extinguishing nozzle 1 is provided such that the net 6 provided at the discharge port 5 is spaced from the rim of the discharge port 5 in the axial direction in the length of the first distance t1. First net 6a and a second net 6b provided at a distance of a second distance t2 (longer than the first distance t1) from the first net 6a and spaced inward in the axial direction. It is made up of. As described above, the advantage of having only one net 6 has been demonstrated, and it is needless to say that only one net 6 may be used.

  Experimental result 2 shown below shows that it is more advantageous to provide two nets. In the experiment, as Example 6, a mesh having a wire diameter of 0.20 mm and a mesh of 16 ″ was used, and as Example 7, a mesh of wire having a diameter of φ0.20 mm and a mesh of 16 ″ was used. Two examples are used, and as Example 8, two meshes having a wire diameter of φ0.20 mm and a mesh 20 ″ are used, and the temperature conditions of the temperature and water temperature are 25 and 25 respectively. % Reduction time was measured.

  As for the experimental results, in all of Examples 6 to 8, the reduction time is 25% shorter when the temperature condition is high, but when looking at the rate of change from the case where the temperature condition is low, the example is higher than Example 6. 7 has a lower rate of change, and Example 8 has a lower rate of change than Example 7. That is, the experimental result 2 shows that it is more advantageous to provide two meshes in terms of the influence of the change in temperature conditions on the bubble reduction time, and further by making the mesh finer. It can be said that it shows an advantage.

  Further, in the present embodiment, as described above, the foam fire-extinguishing nozzle 1 is configured such that the first mesh 6a in the mesh 6 is spaced inward in the axial direction from the rim 5a of the discharge port 5 by the length of the first distance t1. It has been provided.

  Experimental result 3 shown below shows that the bubble reduction time can be extended also by providing a net spaced inward in the axial direction at a predetermined distance from the edge of the discharge port. In the experiment, as Example 9, a wire having a wire diameter of 0.5 mm, a mesh of 14 ″, a space of 1.31, and an aperture ratio of 52% was used. As Example 10, the wire diameter of φ0.35 mm, a mesh of 16 ′ was used. ', Using a mesh with a mesh of 1.24 and an aperture ratio of 61%, and as Example 11, using a mesh of a wire with a diameter of 0.28 mm, a mesh of 24 ″, a mesh of 0.78, and an aperture of 54% The 25% reduction time was measured for each of the case of being provided at a position of 0 mm from the opening edge of the discharge port and the case of being provided at a position 15 mm in the axial direction.

  As a result of the experiment, in any of Examples 9 to 11, the 25% reduction time was longer when the net was provided at an inner position in the 15 mm axial direction. That is, it can be said that the experimental result 3 shows that the bubble reduction time can be extended by providing the net at a predetermined distance from the rim of the discharge port inward in the axial direction as described above. . That is, from the result of this experiment, after passing through the net, it is possible to supply the foam aqueous solution that is generated by colliding with the inner side surface of the discharge port and breaking the foam to the foam in the foam state, thereby the film thickness of the foam. It is thought that the thickness can be increased.

  As mentioned above, although an example of embodiment of this invention was demonstrated, this invention is not limited to said embodiment.

  For example, the net 6 provided in the discharge port 5 can be mesh-like as used in the experiment, but it may be a punching metal instead.

1: Foam fire extinguishing nozzle 2: Fire extinguishing water supply part 2a: 1st foam aqueous solution supply port 2b: 2nd foam aqueous solution supply port 2c: Spiral member 3: Intake port 4: Foaming part 5: Release port 5a: Mouth edge 6 : Network 6a: first network 6b: second network t1: first distance t2: second distance

Claims (3)

A foam aqueous solution supply unit having a supply port for supplying a foam aqueous solution, an intake port for sucking air by the water flow of the foam aqueous solution supplied from the supply port, and a diameter larger than the inner diameter of the foam aqueous solution supply unit And a foaming portion that foams by mixing the foam aqueous solution and the air, and a discharge port that has an inner diameter smaller than the inner diameter of the foaming portion and discharges the foam foamed by the foaming In the foam fire-extinguishing nozzle with
The supply port of the foam aqueous solution supply unit includes a first foam aqueous solution supply port provided at the center and a plurality of second second foam aqueous solution supply ports provided around the first foam aqueous solution supply port. And having
The first foam aqueous solution supply port is provided with a swirl flow forming means for forming a swirl flow, and discharges the foam aqueous solution into a swirl flow radially,
The second foam aqueous solution supply port discharges the foam aqueous solution in a rod shape, and is a foam fire-extinguishing nozzle.   2. The foam fire-extinguishing nozzle according to claim 1, wherein the swirling flow forming means is a spiral member having a swirling flow forming portion in which a spiral surface is formed.   3. The foam fire-extinguishing nozzle according to claim 1, wherein the second aqueous foam solution supply port is disposed at equiangular intervals around the first aqueous foam solution supply port. 4.

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