JP6363966B2 - Foaming equipment for foam fire extinguishing equipment - Google Patents

Description

  The present invention relates to a foaming apparatus for foam fire extinguishing equipment, which is mainly installed in a tank storage for storing flammable liquids such as petroleum.

  As a fire extinguishing facility in a tank storage for storing flammable liquids such as oil, foaming fire-fighting foam by foaming a foam-extinguishing foam aqueous solution that has been mixed with air and mixed with a foam-extinguishing chemical foam foam and water. There is a foam extinguishing system that generates and covers the flame with fire-extinguishing foam, shuts off the flame and oxygen from the outside air, and extinguishes fire. The foam extinguishing equipment includes a foaming device that generates a foam for fire extinguishing by foaming a foam fire extinguishing foam aqueous solution obtained by mixing air and a foam extinguishing chemical mixture composed of a foam fire extinguishing chemical and water.

  Conventionally, as a foaming apparatus for foam fire extinguishing equipment, as shown in FIG. 7, an orifice 13 and an air intake port 14 for injecting a foam fire-extinguishing agent mixed liquid in which a foam-extinguishing agent and water introduced are mixed are provided on the primary side. The fire extinguishing foam aqueous solution radiation tube 16 provided with the radiation port 15 on the secondary side and the foaming chamber 17 attached to the secondary side of the fire extinguishing foam aqueous solution radiation tube 16 are provided. The air is sucked in from the air intake 14 by the negative pressure generated by the injection of the foam fire-extinguishing agent mixture injected into the aqueous solution radiant tube 16, and the fire-extinguishing foam aqueous solution in which the foam-extinguishing agent mixture and air are stirred and mixed therein is the radiation outlet. 15 radiates into the foaming chamber 17 from 15, collides with the top plate 18 of the foaming chamber 17, foams, and emits fire-extinguishing foam from a cylindrical foam outlet 20 provided on the side wall 19 of the foaming chamber 17. Fire equipment foam apparatus is known (e.g., see Patent Document 1.).

JP 2009-284999 A

  In foam extinguishing, a foam performance such as a high foaming ratio and a long reduction time is required for a fire extinguishing foam produced by mixing air in a fire extinguishing foam aqueous solution in which fire fighting water and foam stock solution are mixed at a predetermined ratio. The higher the expansion ratio, the larger the volume of foam generated, and the fire target can be covered with thicker foam. In addition, the longer the reduction time, the harder the foam will break, so cover the fire target for a long time. This is because it is advantageous for fire extinguishing. The higher foaming ratio is improved as the fire-fighting foam aqueous solution and air are mixed well, and the longer reduction time is improved as the diameter of the generated foam is smaller.

  Even with a conventional foaming device for foam fire extinguishing equipment as described in Patent Document 1, foam performance such as a sufficiently high foaming ratio and a long reduction time on the standard is obtained, but in the foam fire extinguishing equipment, Improving the foam performance such as the expansion ratio and reduction time and improving the fire extinguishing effect has always been a challenge.

  In order to produce a fire-fighting foam having a foam performance such as a high foaming ratio and a long reduction time, the present inventors improve the mixing of the fire-fighting foam aqueous solution and air and reduce the produced foam. As a result of repeated research, the present invention has been achieved by focusing on the fact that the foam residence time in the foaming chamber is lengthened and the turbulent flow is generated in the foam flow.

  An object of the present invention is to provide a foaming apparatus for foam fire extinguishing equipment that can improve foam performance with a simple apparatus.

  In order to achieve the above-mentioned object, the invention according to claim 1 is provided with an orifice and an air intake on the primary side for injecting a foam fire-extinguishing agent mixed solution obtained by mixing the introduced foam-extinguishing agent and water. A fire-fighting foam aqueous solution radiation tube provided with a radiation port on the secondary side, and a foaming chamber attached to the secondary side of the fire-fighting foam aqueous solution radiation tube, and emitting the fire-fighting foam aqueous solution from the orifice The foaming chamber is provided with an aqueous foam solution for fire extinguishing, in which air is sucked in from the air intake by negative pressure due to the jetting of the foam fire-extinguishing agent mixture injected into the pipe, and the foam-extinguishing agent mixture and air are stirred and mixed inside. In the foam extinguishing apparatus for foam fire extinguishing equipment, the foaming device emits fire-extinguishing foam from a cylindrical foam discharge port provided on a side wall of the foaming chamber. The discharge opening of the outlet, characterized in that installed the aperture plate squeeze 75-30% with respect to the opening area of the discharge opening.

  According to invention of Claim 1, since the aperture plate which restrict | squeezes a discharge | release opening part to 75%-30% with respect to opening area was installed in the discharge | release opening part of the said cylindrical foam discharge | release opening | mouth, the foam aqueous solution for fire extinguishing The foaming bubble radiated into the foaming chamber has a long residence time in the foaming chamber, and the fire-fighting foam aqueous solution and air are well stirred and foamed at a high magnification. The flowing bubbles collide with the throttle plate at the discharge opening to generate a vortex, and the flow velocity rapidly increases at the throttled discharge opening, and a vortex is generated at the exit of the discharge opening. The foam is agitated with air by the vortex generated on the primary side and the secondary side of the part and foams, so the foaming ratio is dramatically improved, and fire extinguishing foams with excellent foam performance with a long reduction time can be generated.

  The invention according to claim 2 is characterized in that at least a lowermost part of the discharge opening of the cylindrical bubble discharge opening squeezed by the diaphragm plate is opened.

  According to the second aspect of the present invention, since at least the lowermost portion of the discharge opening of the cylindrical bubble discharge port squeezed by the squeezing plate is open, bubbles do not accumulate in the foam chamber. It can be surely released to the outside.

  According to the foaming apparatus for foam fire-extinguishing equipment according to the present invention, the foaming ratio is dramatically improved, and fire-extinguishing foams excellent in foam performance with a long reduction time can be generated.

It is a schematic longitudinal cross-sectional view which shows an example of embodiment of the foaming apparatus for foam fire extinguishing facilities which concerns on this invention. It is an enlarged front view which shows the discharge | release opening part of the cylindrical bubble discharge port squeezed with the aperture plate. It is an enlarged front view which shows the other example of the discharge opening part of the cylindrical foam discharge port squeezed with the aperture plate. It is an enlarged front view which shows the other example of the discharge opening part of the cylindrical foam discharge port squeezed with the aperture plate. It is a schematic longitudinal cross-sectional view which shows the other examples of an aperture plate. It is a schematic longitudinal cross-sectional view which shows the other examples of an aperture plate. It is a schematic longitudinal cross-sectional view which shows the conventional foaming apparatus for foam fire extinguishing equipment.

Hereinafter, an example of an embodiment of a foaming apparatus for foam fire-extinguishing equipment according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic longitudinal sectional view of this example, FIG. 2 is an enlarged front view showing an opening of a cylindrical foam discharge port squeezed by a diaphragm plate, and FIG. 3 is an opening of a cylindrical foam discharge port squeezed by a diaphragm plate. FIG. 4 is an enlarged front view showing another example of the opening of the cylindrical bubble discharge port squeezed by the diaphragm plate, FIG. 5 is a schematic longitudinal sectional view showing another example of the diaphragm plate, FIG. 6 is a schematic longitudinal sectional view showing another example of the diaphragm plate.
It is.

  The foaming apparatus for foam fire extinguishing equipment of this example is provided with an orifice 1 and an air intake port 2 on the primary side and a foam aqueous solution radiation tube 4 with a radiation port 3 on the secondary side, and a foam aqueous solution for fire extinguishing. A foaming chamber 5 attached to the secondary side of the radiation tube 4 is provided.

  In the fire-extinguishing foam aqueous solution radiation tube 4, there is a connection portion 6 connected to a water supply pipe (not shown) for supplying a fire-extinguishing foam aqueous solution in which a fire extinguishing water and a foam stock solution are mixed in a predetermined ratio at the primary side end. The fire-fighting foam aqueous solution supplied from the water pipe is jetted into the fire-fighting foam aqueous solution radiation pipe 4 by passing through the orifice 1, and from the air intake 2 due to the negative pressure due to the jet of the foam fire-extinguishing chemical mixture Air is sucked into the fire-extinguishing foam aqueous solution radiation tube 4, and the fire-extinguishing foam aqueous solution obtained by stirring and mixing the foam fire-extinguishing agent mixed solution and air in the fire-extinguishing foam aqueous solution radiation tube 4 is emitted from the radiation port 3 into the foaming chamber 5. It is like that.

  The foaming chamber 5 includes a top plate 7, a cylindrical side wall 8, and a bottom plate 9 that collide and foam the fire-extinguishing foam aqueous solution radiated from the radiation port 3 of the fire-extinguishing foam aqueous solution radiation tube 4. In the side wall 8, a cylindrical foam discharge port 10 for releasing the fire-extinguishing foam foamed in the foaming chamber 5 is opened. Although not shown, the top plate 7 has a function as a lid that can be opened and closed.

  A diaphragm plate that squeezes the discharge opening 11 to 75% to 30% of the opening area in the discharge opening 11 of the cylindrical bubble discharge port 10 provided on the side wall 8 of the foaming chamber 5 arranged in this manner. 12 is installed. The opening area of the cylindrical bubble discharge port 10 of this example and the discharge opening part 11 of the cylindrical bubble discharge port 10 is the discharge of the cylindrical bubble discharge port and the cylindrical bubble discharge port in the conventional foaming apparatus for foam fire extinguishing equipment. It is set to be the same as the opening area of the opening.

  In this example, the diaphragm plate 12 is installed at an angle (90 degrees) perpendicular to the axial direction of the cylindrical foam outlet 10 (see FIG. 1). The discharge opening 11 of the cylindrical bubble discharge port 10 whose opening area is narrowed down by the diaphragm plate 12 requires that at least the lowermost part 11a is opened. In this example, the discharge opening 11 is narrowed in a state where the upper half of the discharge opening 11 is closed by the diaphragm plate 12 and the lowermost part 11a of the discharge opening 11 is opened (see FIG. 2). However, it is not limited to this.

  3 and 4 show another example of the discharge opening 11 of the cylindrical bubble discharge port 10 provided with the diaphragm plate 12. The discharge opening 11 shown in FIG. The side half of the discharge opening 11 is closed and the lowermost part 11a of the discharge opening 11 is opened. In addition, the discharge opening 11 shown in FIG. 4 is provided with a hole 12a corresponding to 75% to 30% of the opening area of the discharge opening 11 in the diaphragm plate 12, and the lower edge of the hole 12a and the discharge opening 11 The discharge opening 11 is closed and the lowermost part 11a of the discharge opening 11 is squeezed so that the lower edges are aligned.

  In this example, the diaphragm plate 12 is installed at an angle of 90 degrees with respect to the axial direction of the cylindrical foam discharge port 10, but is not limited thereto, and is 45 degrees (see FIG. 5) to 135 degrees (see FIG. 5). 6), and is preferably in the range of 45 to 90 degrees.

  According to the foaming device for foam fire extinguishing equipment of this example configured as described above, the fire-extinguishing foam aqueous solution radiated from the radiation port 3 of the fire-extinguishing foam aqueous solution radiation tube 4 collides with the top plate 7 of the foaming chamber 5. The foam aqueous solution for fire extinguishing and the air are stirred and flow through the foaming chamber 5. In this process, foaming is promoted, and the foamed foam flows to the cylindrical foam discharge port 10, and the discharge opening 11 of the cylindrical foam discharge port 10. However, since the squeezing plate 12 is installed in the discharge opening 11 of the cylindrical bubble discharge port 10 and the discharge opening 11 is squeezed, the residence time of bubbles in the foaming chamber 5 becomes longer, and the fire extinguishes. Foam aqueous solution and air are well stirred and foamed at a high magnification.

Moreover, in the foaming chamber 5, a speed component having a high flow rate and a speed component having a slow flow rate are mixed. However, since the flow rate of the foam is rapidly increased in the throttled discharge opening 11, the speed in the foaming chamber 5 is high. Since the difference between the component and the velocity component having a low flow velocity becomes large, the stirring of the foam aqueous solution for fire extinguishing and air is further promoted, and the foaming performance is further improved.
Further, the bubble flowing through the cylindrical bubble discharge port 10 has a rapidly increasing flow velocity at the narrowed discharge opening 11, and a vortex is generated on the secondary side of the discharge opening 11, and the vortex generated on the secondary side Since it is agitated with air and foamed, the expansion ratio is dramatically improved, and it is possible to produce a fire extinguishing foam excellent in foam performance with a long reduction time.
In particular, when the diaphragm plate 12 is installed in an angle range of 45 degrees to 90 degrees with respect to the axial direction of the cylindrical foam discharge port 10, vortex flows are generated on the primary side and the secondary side of the discharge opening portion 11, so Air and agitation are further promoted to further improve the foaming ratio, and it is possible to produce a fire extinguishing foam excellent in foam performance with a long reduction time.

The discharge opening 11 of the cylindrical bubble discharge port 10 is squeezed to 75 to 30% with respect to the opening area by the diaphragm plate 12, and the bubble retention time effective for foaming in the foaming chamber 5 within this range. In addition, an effective vortex for foaming can be obtained on the primary side and the secondary side of the discharge opening 11, and a necessary amount of foam can be ensured.
When the opening area of the discharge opening 11 after the squeezing is 75% or more with respect to the opening area before the squeezing, it is not possible to obtain a bubble retention time effective for foaming in the foaming chamber 5, and the discharge opening. No eddy current effective for foaming can be obtained on the primary side and the secondary side. In addition, when the opening area of the discharge opening 11 after the squeezing is 30% or less with respect to the opening area before the squeezing, the amount of foam released is reduced, and the necessary amount of foam released cannot be secured.

DESCRIPTION OF SYMBOLS 1 Orifice 2 Air intake port 3 Radiation port 4 Fire extinguishing foam aqueous solution radiation tube 5 Foaming chamber 6 Connection part 7 Top plate 8 Side wall 9 Bottom plate 10 Cylindrical bubble discharge port 11 Discharge opening part 12 Diaphragm plate 12a Hole

Claims (2)

On the primary side, there are provided an orifice and an air intake for injecting a foam fire-extinguishing agent mixed liquid in which the introduced foam-extinguishing agent and water are mixed, and on the secondary side, a foam aqueous solution radiation tube for fire-fighting is provided with a radiation port. And a foaming chamber attached to the secondary side of the fire-extinguishing foam aqueous solution radiation tube, and taking in air by negative pressure due to injection of the foam fire-extinguishing agent mixture injected into the fire-extinguishing foam aqueous solution radiation tube from the orifice Foam fire extinguishing, in which air is sucked in from the mouth, and a foam aqueous solution for fire extinguishing, in which the foam fire-extinguishing agent mixture and air are stirred and mixed, is emitted from the radiation port into the foaming chamber and collides with the top plate of the foaming chamber. In equipment foaming equipment,
The foaming chamber includes a cylindrical side wall and a cylindrical bubble discharge port protruding in a horizontal direction from the side wall, and the discharge opening of the cylindrical bubble discharge port is formed in the axial direction of the cylindrical bubble discharge port. The foam is blocked by a diaphragm plate fixed at an angle within a range of 45 to 135 degrees, and the diaphragm plate squeezes the discharge opening to 75% to 30% with respect to the opening area. Foaming equipment for fire extinguishing equipment.   The foaming apparatus for foam fire-extinguishing equipment according to claim 1, wherein at least a lowermost part of the discharge opening of the cylindrical foam discharge port squeezed by the diaphragm plate is open.

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