JP2012024354A - Foam generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foam generating device that can demonstrate excellent foaming performance without impairing quake resistance.SOLUTION: The foam generating device 1 includes: a hollow cylindrical body 2; a foaming mesh 3 that covers an opening at an end in an axis direction of the hollow cylindrical body 2; a discharge nozzle 4 that is disposed at the other end in the axis direction of the hollow cylindrical body 2 and that discharges a foaming agent to the foaming mesh 3 through the inside of the hollow cylindrical body 2; at least two support rods 7 that extend in the axis direction from the other end of the hollow cylindrical body 2, separate the discharge nozzle 4 from the hollow cylindrical body 2, and separate the same; and two or more reinforcement members 11, each of which circularly extends in a circumferential direction of the hollow cylindrical body 2 and are located in the axial direction spaced apart from each other at an interval.

Description

  The present invention relates to a foaming machine used for a high expansion foam fire extinguishing apparatus, and more particularly, to a machine intended to ensure excellent foaming performance without impairing earthquake resistance.

  High expansion foam fire extinguishing equipment releases foaming agent including surfactant and stabilizer from the radiation nozzle, foams by blowing foaming agent against foaming mesh while entraining surrounding air, and cooling and suffocation by this foam The fire is extinguished by the effect. High-expansion foam fire extinguishing equipment is safer and more environmentally friendly than fire extinguishing equipment using halogen gas or CO2 gas, so it is widely used as a fire extinguishing device for local fires such as engine rooms and pump rooms in ships. It's getting on. And as a foaming machine used for such a high expansion foam fire extinguishing apparatus, conventionally, a foaming machine main body formed in a cylindrical shape, a foaming net provided on the tip side of the foaming machine main body, and a foaming machine main body There has been proposed a radiation nozzle that is provided inside and radiates a foaming agent toward a foaming net (see Patent Document 1).

JP 2009-240567 A

  By the way, in the foaming machine as proposed in Patent Document 1, since the radiation nozzle is provided inside the foaming machine main body, the length of the foaming machine main body is increased in order to ensure a sufficient air suction amount. In this case, the weight of the entire foaming machine is increased, and the inertial force applied to the stressed portion is increased when vibration is generated. Therefore, there is a problem that desired earthquake resistance cannot be obtained. Particularly, in the foaming machine as described above, since the foaming machine main body is hollow, the foaming machine main body has low rigidity in the radial direction, and whenever a vibration is applied, bending stress due to deflection is applied to the attachment part of the foaming net. As a result, the foam net is damaged.

  Therefore, an object of the present invention is to provide a foaming machine capable of exhibiting excellent foaming performance without impairing earthquake resistance.

  In order to solve the above problems, a foaming machine according to the present invention is provided on a hollow cylindrical body, a foam mesh covering an opening at one end of the body in the axial direction, and the other end side in the axial direction of the body. A foaming nozzle that radiates a foaming agent toward the foamed mesh through the inside of the fuselage, extending from the other end of the fuselage along the axial direction, and separating the radiation nozzle from the fuselage And at least two support rods to be supported, and two or more reinforcing members extending annularly along the circumferential direction of the body and spaced apart from each other in the axial direction. It is characterized by.

  In such a foaming machine, since the radiation nozzle is sufficiently separated from the fuselage by the support rod, when the foaming agent is radiated from the radiation nozzle, the foaming mesh can be made to collide with the foamed mesh in the desired radiation form, Since sufficient air can be sucked from between the radiation nozzles, excellent foaming performance (foaming ratio) can be realized. At this time, since the annular reinforcing members provided on the fuselage axially apart from each other reinforce the fuselage in the radial direction, even if the radiation nozzle is arranged away from the fuselage, the desired earthquake resistance is ensured. can do.

  Therefore, according to the foaming machine of the present invention, excellent foaming performance can be exhibited without impairing the earthquake resistance.

  In the foaming machine according to the present invention, at least one of the reinforcing members is composed of a reinforcing rib having a convex shape from the inside of the body toward the outside or from the outside of the body to the inside. It is preferable.

  Further, in the foaming machine of the present invention, the body has the two reinforcing members, and one of the two reinforcing members has one end of the body and the axial length of the body from the one end. The other of the two reinforcing members is 2.9-20% of the other end of the body and the axial length of the body from the other end. It is preferable that it is arrange | positioned between% positions.

  Furthermore, in the foaming machine according to the present invention, the body has a flange that extends radially outward from the other axial end of the body and surrounds the other end over the entire circumference. Is preferred.

Furthermore, in the foaming machine of the present invention, when the distance from the other axial end of the body to the radiation nozzle is L1, and the distance from the tip of the foaming machine to the radiation nozzle is L2,
It is preferable to satisfy 0.25 ≦ L1 / L2 ≦ 0.48.

  And in the foaming machine of this invention, it is preferable that the said fuselage has a bracket for fixing to a structure, and the width | variety of this bracket is 10% or more of the periphery of a fuselage.

  According to this invention, it is possible to provide a foaming machine capable of exhibiting excellent foaming performance without impairing earthquake resistance.

It is a perspective view of the foaming machine of 1st embodiment according to this invention. It is a top view of the foaming machine of FIG. It is a side view of the foaming machine of FIG. It is a perspective view which shows the use condition of the foaming machine of FIG. It is a perspective view of the foaming machine of 2nd embodiment according to this invention. It is the graph which showed the relationship between the radial load applied to a fuselage, and the amount of deflection of the fuselage in the radial direction for the foaming machines of Example 1 and Comparative Example 1. In the foaming machine of the comparative example 1, it is the graph which showed the relationship between the frequency and acceleration, (a) shows the relationship between the frequency and acceleration in a fuselage, (b) shows the frequency and acceleration in a radiation nozzle. The relationship is shown. In the foaming machine of Example 1, it is the graph which showed the relationship between the frequency and acceleration, (a) shows the relationship between the frequency and acceleration in a fuselage, (b) shows the frequency and acceleration in a radiation nozzle. The relationship is shown. It is the graph which showed the relationship between the width | variety of a bracket for fixation, and trunk | drum strength. It is the graph which showed the relationship between the distance from the trunk | drum, and foaming performance of a radiation nozzle.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the foaming machine 1 is provided on a hollow cylindrical body 2, a foam mesh 3 that covers an opening at one end of the body 2 in the axial direction S, and the other end side of the body 2 in the axial direction S. And a radiation nozzle 4 that radiates a foaming agent toward the foamed mesh 3 through the inside of the body 2.

  The foamed mesh 3 has a conical shape, and the cone angle θ (see FIG. 2) can be 30 ° or more and less than 180 °. Moreover, the foaming mesh 3 should just have many holes which let the foaming agent radiated | emitted from the radiation nozzle 4 penetrate, for example, what was comprised by metal punching plates and a metal net | network can be used.

  The fuselage 2 has a bracket 6 for fixing to a structure at a substantially central position in the axial direction S, and the foaming machine 1 is attached to the engine room of the ship, the ceiling in the pump chamber, or the like via the bracket 6. Can do. In this example, the width W of the bracket 6 (the linear distance from one end of the bracket 6 in the circumferential direction to the other end) is 10% of the circumferential length of the body 2. In the figure, reference numeral 6a indicates a hole through which a bolt or the like used for fixing to a structure is passed.

  The body 2 is provided with at least two (three in this case) belt-like support rods 7 extending from the other end of the body 2 along the axial direction S, whereby the radiation nozzle 4 is separated from the body 2. It is supported. The tip of each support rod 7 is fixed to a flange 9 for connection to a pipe P1 (see FIG. 4) connected to the radiation nozzle 4. A branch head 10 is attached to the flange 9 to branch the blowing agent supplied through the pipe P1 to the radiation nozzles 4.

  Further, the body 2 is provided with two or more (two in this case) reinforcing members 11 that extend annularly along the circumferential direction of the body 2 and are spaced from each other in the axial direction S. Each reinforcing member 11 is composed of a reinforcing rib having a convex shape from the inside to the outside of the body 2. In addition, although illustration is abbreviate | omitted, each reinforcement member 11 is not restricted to this, It is good also as a reinforcement rib which makes a convex shape toward the inside from the outer side of the trunk | drum 2, or a metal ring or equilateral angle steel is made into a ring shape. A bent member may be used (not shown).

  One of the two reinforcing members 11 is disposed between one end of the body 2 and a position 2.9 to 20% of the axial length L3 of the body 2 from the one end. The other of the two is disposed between the other end of the body 2 and a position 2.9 to 20% of the axial length L3 of the body 2 from the other end to ensure the desired earthquake resistance. Preferred above. In this example, one of the two reinforcing members 11 is disposed at a position of 14.3% of the axial length L3 of the body 2 from one end of the body 2, and the other of the two reinforcing members 11 is The other end of the body 2 is disposed at a position of 14.3% of the axial length L3 of the body 2.

  Next, the operation of the foaming machine 1 will be described.

  As shown in FIG. 4, a pipe P1 is connected to the radiation nozzle 4 of the foaming machine 1, and a foaming agent tank, pump, valve, instrumentation, etc. (not shown) are provided on the upstream side of the pipe P1. . In addition, the foaming machine 1 shall be fixed to the ceiling of the engine room of a ship with the volt | bolt. Here, when the pump is activated, the foaming agent in the foaming agent tank is radiated from the radiation nozzle 4 through the pipe P1 at a predetermined pressure (for example, 0.3 to 0.5 MPa). The emitted foaming agent collides with the foamed mesh 3 while sucking ambient air. At this time, since the radiating nozzle 4 is arranged at a sufficient distance from the body 2 by the support rod 7, the foaming agent can collide with the foamed mesh 3 in the desired radiating form, and the body 2 and the radiating nozzle 4. Since sufficient air can be sucked in between, good foaming performance can be obtained. Further, the body 2 is provided with annular reinforcing ribs 11 spaced apart from each other in the axial direction S. The reinforcing ribs 11 reinforce the body 2 in the radial direction so that the radiation nozzle 4 is separated from the body 2. However, the expected earthquake resistance can be secured.

  Moreover, in the foaming machine 1 of the said embodiment, since the reinforcement member 11 was comprised by the reinforcement rib which makes a convex shape toward the outer side from the inner side of the fuselage | body 2, the reinforcement member 11 is comprised, without increasing a weight. In addition, since the inertia force during vibration can be suppressed as compared with the case where a ring or a member obtained by processing an equilateral angled steel into a ring shape is separately provided, more excellent earthquake resistance can be realized.

  Further, in the foaming machine 1 of the above embodiment, one of the two reinforcing members 11 is between one end of the body 2 and a position that is 2.9 to 20% of the axial length of the body 2 from the one end. And the other of the two reinforcing members 11 is disposed between the other end of the body 2 and a position 2.9 to 20% of the axial length of the body 2 from the other end. It is possible to reliably reinforce the region near both opening ends of the body 2 where the rigidity in the radial direction is relatively low, and the desired earthquake resistance can be reliably ensured.

  In the present invention, when the distance from the other end in the axial direction S of the body 2 to the radiation nozzle 4 is L1, and the distance from the tip of the foam mesh 3 to the radiation nozzle 4 is L2, 0.25 ≦ L1 / L2 ≦ 0.48 is preferable, and 0.39 ≦ L1 / L2 ≦ 0.48 is more preferable. According to this, both foaming performance and earthquake resistance can be achieved at a higher level. When L1 / L2 is less than 0.25, the distance between the body 2 and the radiation nozzle 4 is too small, and it is difficult to suck and entrain sufficient air when the foaming agent is emitted, which may reduce the foaming performance. There is. On the other hand, when L1 / L2 exceeds 0.48, the distance from the radiation nozzle 4 to the foam mesh 3 becomes too large to collide with the foam mesh 3 in the desired radiation form, and the foam performance is reduced. In addition to this, as a result of the total length of the foaming machine 1 being increased, the inertial force at the time of vibration generation becomes excessive, and the earthquake resistance may be reduced.

  In the present invention, the width W of the bracket 6 is preferably 10% or more, more preferably 15% or more of the circumferential length of the body 2. According to this, since the deformation amount of the trunk | drum 2 at the time of a vibration can be made smaller, earthquake resistance can be improved further.

  Next, another embodiment according to the present invention will be described. In the foaming machine 1 according to the embodiment shown in FIG. 5, the flange 2 extends from the other end of the body 2 in the axial direction S toward the outer side in the radial direction and surrounds the other end over the entire circumference. Is provided. By providing the flange portion 12 at the other end of the body 2 to which the support rod 7 is connected in this way, the radial rigidity at the other end of the body 2 where the support rod 7 is connected and the inertial force during vibration increases is effective. Can be improved and the earthquake resistance can be further improved.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the claims. For example, in the above embodiment, it has been described that two reinforcing members 11 are provided on the body 2, but three or more reinforcing members 11 may be provided. In the example of FIG. 5, the flange portion 12 is provided only at the other end of the body 2, but a similar flange portion may be provided at one end of the body 2 where the foamed mesh 3 is disposed (illustrated). (Omitted).

  Next, various performance tests were conducted to confirm the effects of the present invention, which will be described below.

The foaming machine of Example 1 has the configuration shown in FIG. 5, and the cone angle θ of the foamed mesh is 88 °. The fuselage has a position of about 14.3% of the axial length L3 of the fuselage from one axial end of the fuselage and about 14.3% of the axial length L3 of the fuselage from the other axial end of the fuselage. Reinforcing ribs are provided at each position. Further, L1 / L2 which is a ratio of the distance L1 from the other end in the axial direction of the trunk to the radiation nozzle and the distance L2 from the tip of the foam mesh to the radiation nozzle is 0.43.
Further, the trunk is provided with a collar portion that extends radially outward from the other axial end of the trunk and surrounds the other end over the entire circumference.

  In the foaming machine of Example 2, the distance L1 from the other end in the axial direction of the trunk to the radiation nozzle is made smaller than that of the foaming machine of Example 1, and L1 / L2 is 0.39. Other configurations are the same as those of the foaming machine of the first embodiment.

  In the foaming machine of Example 3, the distance L1 from the other end in the axial direction of the trunk to the radiation nozzle is made larger than that of the foaming machine of Example 1, and L1 / L2 is 0.48. Other configurations are the same as those of the foaming machine of the first embodiment.

  The foaming machine of Comparative Example 1 has the same configuration as the foaming machine of Example 1 except that the fuselage does not have reinforcing ribs and flanges.

(Test on fuselage stiffness)
The amount of deflection in the radial direction when a radial load was applied to the fuselage was measured for the foaming machine of Example 1 having reinforcing ribs and the foaming machine of Comparative Example 1 having no reinforcing ribs and flanges. The test results are shown in FIG. It can be seen that in Example 1 provided with the reinforcing rib, the amount of deformation is particularly small in a high load region of 60 kg or more, and the amount of deformation can be reduced even with respect to vibration.

(Vibration test)
A vibration test was performed on the foaming machines of Example 1 and Comparative Example 1 by the following method. The vibration test shall be conducted in accordance with the rules (MSC / Cire. 1165 4.15) established by IMO (International Maritime Organization). Specifically, vibration resistance is evaluated for 120 minutes at the resonance frequency. The resonance frequency is investigated by continuously vibrating at a rate of 5 minutes / octave from 5 Hz to 40 Hz with an amplitude of 1 mm (1/2 of the maximum amplitude value). The test results are shown in FIGS. 7A and 7B, FIGS. 8A and 8B, and Table 1. FIG. FIGS. 7 (a) and 8 (a) show data of an acceleration sensor attached to the body of the foaming machine, and FIGS. 7 (b) and 8 (b) are attached to the radiation nozzle of the foaming machine. The data of the obtained acceleration sensor is shown. 7 and 8, the horizontal axis of the graph is the frequency (Hz), and the vertical axis is the acceleration (G). Table 1 shows the resonance frequency and the maximum acceleration in each foaming machine read from FIGS. In addition, the amplitude in Table 1 is a value calculated from acceleration and vibration frequency by the following mathematical formula. Here, in the formula, “DA” is an amplitude (mm), “G” is an acceleration (G), and “Hz” is a resonance frequency (Hz).

  From the results shown in Table 1, the amplitude of the foaming machine of Comparative Example 1 without the reinforcing rib and the flange portion is 35.2 mm, whereas the amplitude of the foaming machine of Example 1 with the reinforcing rib and the flange portion is shown. The amplitude is 10.6 mm. The maximum amplitude of the foaming machine of Example 1 is reduced to about 30% of the foaming machine of Comparative Example 1, and it can be seen that the problem of damaging the foaming machine due to vibration is solved by the reduction of the maximum amplitude. . Further, when the visual inspection and the penetrant flaw detection test were performed on the foaming machine of Example 1 and Comparative Example 1, the foaming machine of Example 1 was not damaged, whereas the foaming of Comparative Example 1 In the machine, it was confirmed that the attachment part of the foamed mesh was broken, and cracks were generated at the connection points between the support rod and bracket and the fuselage.

(Investigation test of the effect of fixing bracket width on fuselage strength)
In order to investigate the influence of the fixing bracket width W on the fuselage strength, a variety of foaming machines having the structure shown in FIG. The test is to measure the displacement (mm) at point A by applying a tangential load F to the position A (see FIG. 3) facing the bracket with the foaming machine fixed to the structure via the bracket. It went by. FIG. 9 shows the test results. The vertical axis of the graph represents the amount of change per unit load, and the horizontal axis of the graph represents the ratio (%) of the width of the bracket to the circumference of the body. From this graph, it can be seen that the larger the width of the body bracket, the smaller the amount of deformation of the body.

(Foaming performance test)
The foaming performance (foaming ratio) test of the foaming machines of Examples 1 to 3 was performed by the following method. The foaming performance test was carried out by a method of measuring time t (seconds) until the foam fills the container by releasing the highly expanded foam inside the container having the volume V (L). When the flow rate at the radiation pressure P (MPa) of the radiation nozzle is Q (L / min), the expansion ratio E can be obtained from the following calculation formula.

  In the foaming machine of each specification, the foaming ratio was measured by changing the radiation pressure P of the radiation nozzle, and the foaming performance was evaluated. The test results are shown in the graph of FIG. In the graph of FIG. 10, the vertical axis represents the ratio of the measured foaming ratio to the reference foaming ratio, the horizontal axis represents the ratio of the pressure of the radiation nozzle to the reference pressure, and the larger the numerical value on the vertical axis, the larger the foaming performance. Is good.

  As is clear from the above test results, both the earthquake resistance and the foaming performance can be achieved by supporting the radiation nozzle by separating it from the body with the support rod and providing the reinforcing member on the body. In particular, as is clear from the graph of FIG. 10, it is confirmed that the foaming performance can be further improved by optimizing the value of L1 / L2.

  By this invention, it has become possible to provide a foaming machine capable of exhibiting excellent foaming performance without impairing the earthquake resistance.

DESCRIPTION OF SYMBOLS 1 Foaming machine 2 Body 3 Foaming mesh 4 Radiation nozzle 6 Bracket 7 Support rod 9 Flange 10 Branch head 11 Reinforcing member (reinforcing rib)
12 Buttocks

Claims (6)

A hollow cylindrical body, a foam mesh covering an opening at one end in the axial direction of the body, and provided on the other end side in the axial direction of the body, radiating a foaming agent toward the foam mesh through the inside of the body A foaming machine comprising:
At least two support rods extending from the other end of the body along the axial direction and supporting the radiation nozzle away from the body;
A foaming machine comprising: two or more reinforcing members that extend annularly along the circumferential direction of the body and are spaced apart from each other in the axial direction.   2. The foaming machine according to claim 1, wherein at least one of the reinforcing members is formed of a reinforcing rib having a convex shape from the inside of the body toward the outside or from the outside of the body to the inside.   The body includes two reinforcing members, and one of the two reinforcing members is between one end of the body and a position 2.9 to 20% of the axial length of the body from the one end. The other of the two reinforcing members is disposed between the other end of the body and a position 2.9 to 20% of the axial length of the body from the other end. The foaming machine according to claim 1 or 2.   The said trunk | drum extends toward the radial direction outward from the other end of the axial direction of the said trunk | drum, and has a collar part which surrounds this other end over a perimeter. Foaming machine.   When the distance from the other axial end of the body to the radiation nozzle is L1, and the distance from the leading end of the foaming machine to the radiation nozzle is L2, 0.25 ≦ L1 / L2 ≦ 0.48 is satisfied. The foaming machine according to any one of claims 1 to 4.   The said trunk | drum has a bracket for fixation to a structure, The length along the circumferential direction of the trunk | drum of this bracket is 10% or more of the circumferential length of a trunk | drum, The any one of Claims 1-5 The foaming machine according to one item.

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