JP2009082490A - Compressed air foam apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressed air foam apparatus uniformly mixing fire extinguishing liquid, water and air and capable of forming effective foam. <P>SOLUTION: This foam apparatus 17 is installed on a fire engine 10. This foam apparatus 17 is provided with a casing 71, a water supply part 72, a fire extinguishing liquid supply part 73, a discharge part 74 and a compressed air supply part 75. The casing 71 has a mixing chamber 76. The fire extinguishing water, fire extinguishing liquid and air are simultaneously mixed in the mixing chamber 76. The fire extinguishing water, the fire extinguishing liquid and the air orthogonally cross to each other to be mixed. An agitation member 85 is provided near an outlet of the mixing chamber 76. The agitation member 85 has two agitation disks 86 and 87. The agitation disks 86 and 87 uniformly mix the air with the liquid mixture consisting of the fire extinguishing water and the fire extinguishing liquid. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure of a device that generates water for fire extinguishing by mixing water, air, and a fire extinguishing liquid. The present invention also relates to a fire engine equipped with this device.

  Conventionally, a foam extinguishing method is known as a fire extinguishing means for so-called oil fires. In the foam extinguishing method, for example, a fluorine-based surfactant (extinguishing liquid) is mixed with water and air to generate bubbles, which are emitted to the fire. The fire is extinguished by the suffocation effect and cooling effect of the foam film.

  Fire extinguishing foam is conventionally generated by a compressed air foam apparatus (see Patent Document 1). The conventional compressed air bubble device is provided with a predetermined bubble generation chamber, and a flat plate is arranged inside the bubble generation chamber. A foam raw material supply path and an air supply path are connected to the foam generation chamber. A foam stock solution in which water and a fire extinguishing liquid are mixed in advance is fed into the foam generation chamber through the foam stock solution supply path. Air is supplied to the bubble generation chamber through the air supply path. The foam stock solution mixed with air collides with the flat plate, whereby bubbles are generated.

US Pat. No. 6,217,009

  In order to generate bubbles efficiently, the fire-extinguishing liquid, water and air need to be mixed uniformly. However, in the conventional compressed air bubble device, a foam stock solution in which water and a fire extinguishing liquid are mixed in advance is generated, and air is mixed therewith, so that the fire extinguishing liquid, water and air are not mixed sufficiently uniformly, Foam generation efficiency was poor.

  Accordingly, an object of the present invention is to provide a compressed air bubble device in which fire-extinguishing liquid, water and air are uniformly mixed and capable of producing effective bubbles.

  (1) In order to achieve the above object, the compressed air foam device according to the present invention includes a casing having a mixing chamber in which water, fire extinguishing liquid, and air are mixed to generate a fire extinguishing foam, and a mixing chamber. A water pipe for supplying water, a fire extinguishing liquid pipe for supplying a fire extinguishing liquid to the mixing chamber, an air pipe for supplying air to the mixing chamber, and a discharge pipe for discharging fire extinguishing foam generated in the mixing chamber . The water pipe, the fire extinguishing liquid pipe, and the air pipe are connected to the casing so that water, the fire extinguishing liquid, and air are mixed in the mixing chamber at the same time.

  Water, a fire extinguishing liquid, and air are sent to the mixing chamber of the casing, and these are mixed in the mixing chamber to generate a fire extinguishing foam. At this time, water, fire extinguishing liquid and air are simultaneously mixed in the mixing chamber, so that they are uniformly mixed. That is, air is uniformly mixed with a mixed fluid (stock solution) of water and a fire extinguisher. Accordingly, fire-extinguishing foam is efficiently generated.

  (2) The water pipe, the fire extinguishing liquid pipe, and the air pipe are preferably arranged so that the water supply direction, the fire extinguishing liquid supply direction, and the air supply direction are orthogonal to each other.

  In this case, water, fire extinguishing liquid and air collide violently in the mixing chamber. For this reason, air mixes more uniformly with the mixed fluid (raw solution) of water and the fire extinguishing liquid.

  (3) It is preferable that an agitating member for agitating water, a fire extinguishing liquid, and air to generate a fire extinguishing foam is provided at a boundary portion between the mixing chamber and the discharge pipe.

  A mixture of water, fire extinguishing liquid and air is sent from the mixing chamber to the discharge pipe. At this time, the mixture of water, fire extinguishing liquid and air collides with the stirring member, and the flow of the three parties is disturbed. That is, the mixed fluid (stock solution) of water and fire extinguishing liquid and air are mixed more uniformly.

  (4) The agitating member may be composed of an annular disk arranged so as to reduce the flow passage area of the discharge pipe. The stirring member preferably includes a protruding piece that protrudes radially inward of the discharge pipe.

  In this configuration, the stirring member can be configured easily and inexpensively. And since the stirring member is provided with the protrusion, the flow of the mixture of water, fire extinguishing liquid, and air is further disturbed by the protrusion. Therefore, the mixed fluid (raw solution) of water and fire extinguishing liquid and air are mixed even more uniformly.

  (5) The stirring member preferably includes a plurality of protruding pieces. The protrusions are preferably arranged symmetrically about the central axis of the discharge pipe.

  In this configuration, the flow of the mixture of water, fire extinguishing liquid and air is evenly disturbed in the discharge pipe. Therefore, the mixed fluid (raw solution) of water and the fire extinguishing liquid and air are more uniformly mixed, and fire-extinguishing bubbles are efficiently generated.

  (6) It is preferable that a plurality of stirring members are arranged in parallel in the discharge direction of the fire-extinguishing foam.

  Thereby, the flow of the mixture of water, fire extinguishing liquid and air is more turbulent. Therefore, the mixed fluid (raw solution) of water and fire extinguishing liquid and air are mixed more uniformly.

  (7) The stirring member may include a small hole penetrating in the discharge direction of the fire-extinguishing foam.

  The mixture of water, fire-extinguishing liquid and air is sent from the mixing chamber to the discharge pipe. At this time, the mixture of water, fire-extinguishing liquid and air also passes through the small holes. This small hole functions as a throttle leading from the mixing chamber to the discharge pipe, and the mixture of water, fire extinguishing liquid and air mixes violently when passing through the small hole. Therefore, the mixed fluid (raw solution) of water and fire extinguishing liquid and air are mixed more uniformly.

  (8) A fire engine equipped with the compressed air bubble device can be provided. Since the compressed air foam device efficiently generates fire-extinguishing foam, a fire engine equipped with this device is excellent in foam fire-extinguishing activity at a fire site.

  According to this invention, since the production | generation efficiency of the foam for fire extinguishing is high, the production amount of the foam for fire extinguishing per unit quantity of fire extinguishing liquid increases. Therefore, when the compressed air bubble device according to the present invention is mounted on a fire engine, a large amount of fire-extinguishing foam is released from a small amount of fire extinguishing liquid, so that the fire extinguishing capability of the fire engine is improved.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

<Overall configuration>

  1 to 3 are outfitting diagrams of a fire engine equipped with a compressed air foam device (hereinafter referred to as “foam device”) according to an embodiment of the present invention. 1 is a front view, FIG. 2 is a right side view, and FIG. 3 is a plan view. FIG. 4 is a piping system diagram of this fire engine.

  The fire engine 10 includes a chassis 11, a body 12 mounted on the chassis 11, a fire pump 13, a vacuum pump 14, a water tank 15, a chemical tank 16 and a foam device 17 (FIG. 4) disposed inside the body 12. Reference).

  The water tank 15 has a predetermined volume (for example, 600 l), and can store fire-fighting water. The fire pump 13 is a centrifugal pump that has been conventionally used and includes an impeller. The fire pump includes a water absorption port and a water discharge port, and fire-extinguishing water guided to the water absorption port is centrifugally accelerated by an impeller and discharged from the water discharge port as high-pressure water. This water tank 15 is connected to the water absorption port of the fire fighting pump through the water absorption pipe 20 (see FIG. 4).

  The chemical liquid layer 16 has a predetermined capacity (for example, 20 l) and can store a fire extinguishing liquid containing a surfactant or the like. A stock solution pump 18 is connected to the chemical tank 16. The stock solution pump 18 is driven by a DC motor 19. By operating the stock solution pump 18, the fire extinguishing liquid is supplied from the chemical tank 16 to the foam device 17. The chemical liquid tank 16 is connected to the stock solution pump 18 via a supply pipe 21.

  As shown in FIG. 4, the vacuum pump 14 includes a first pipe 22 and a second pipe 23. The first pipe 22 includes an air chamber 24 and a quick intake / exhaust valve 25, and is connected to the water absorption pipe 20. The second pipe 23 includes a separator receiver tank 26, and an exhaust path 27 and a pressure control valve 28 are connected to the separator receiver tank 26. The foam device 17 is connected to a separator receiver tank 26 via a pressure control valve 28. When the vacuum pump 14 is activated, the air in the water absorption pipe 20 is sucked through the first pipe 22. That is, the inside of the water absorption pipe 20 has a negative pressure, and water for fire extinguishing is led from the water tank 15 to the fire fighting pump 13. On the other hand, the vacuum pump 14 also functions as a compressor. That is, when the vacuum pump 14 is operated in a state where the valve 29 of the first pipe 22 is closed, outside air is sucked through the intake passage 30 and the air filter 31, and the compressed air is supplied to the foam device 17 through the pressure control valve 28. To be sent to.

  As shown in FIGS. 1 to 3, the chassis 11 includes a main frame 36, a wheel 37 suspended from the main frame 36, a cabin 38 provided at the front end of the main frame 36, and not shown. The engine is supported by the main frame 36 and disposed below the cabin 38. The main frame 36 is made of a pair of steel materials having a substantially C-shaped cross section. As shown in FIG. 2, these are arranged to face each other in the left-right direction (vehicle width direction). The main frame 36 includes a plurality of cross members that connect the pair of steel materials to each other, thereby improving the rigidity of the main frame 36 as a whole. The engine is supported by the main frame 36, and a power transmission mechanism is connected to the engine. The wheel 37 is driven through this power transmission mechanism, and the fire engine 10 travels. The cabin 38 constitutes a driver's cab for driving the fire engine 10 to travel.

  The body 12 constitutes the outer shape of the fire engine 10. In this embodiment, the body 12 is made of FRP (Fiber Reinforced Plastics). Of course, the body 12 may be composed of a frame and a steel plate or an aluminum alloy plate. A pump chamber 39 is provided at the center of the body 12. A fire pump 13 and a vacuum pump 14 (see FIG. 4) are mounted below the pump chamber 39, and a water tank 15 and a chemical tank 16 (see FIG. 4) are disposed in front of the pump chamber 39. The fire pump 13 is driven by a driving force extracted from the engine via a PTO (Power Take Off Device). A hose car is detachably attached to the rear of the body 12.

  On the side surface of the body 12, water discharge ports 34 and 35, a relay port 40, a water absorption port 42, an operation monitor 43, and a wireless device 44 are provided. These are arranged symmetrically on the left and right side surfaces of the body 12. In addition, an equipment storage chamber 45 is provided on the side surface of the body 12. The water discharge ports 34 and 35 are provided with an open / close cock. By opening the open / close cock, the high-pressure water discharged from the fire pump 13 is discharged from the water discharge ports 34 and 35. A fire hose is connected to the water discharge ports 34 and 35.

  The relay port 40 can be connected to a fire hydrant or other fire pump. And the water for fire extinguishing supplied to this relay port 40 is sent to the fire fighting pump 13 through the internal piping of the fire engine 10 and discharged from the water discharge ports 34 and 35 as high pressure water. The relay port 40 is also provided with an opening / closing cock. Furthermore, a water absorption pipe 46 is connected to the water absorption port 42. A strainer 47 is provided at the tip of the water absorption pipe 46. The water absorption port 42 is connected to the fire pump 13 through the internal piping of the fire engine 10. Therefore, when the water absorption pipe 46 is inserted into a water source (for example, a river or a pond), fire-fighting water is drawn up from the water source and discharged from the water discharge ports 34 and 35 as high-pressure water. The water absorption port 42 is also provided with an opening / closing cock.

  The operation monitor 43 displays the operation status of the fire pump 13. For example, the pressure and flow rate of fire extinguishing water discharged from the water discharge ports 34 and 35 are displayed. The wireless device 44 is used for communication with other fire engines and fire fighters. The operation monitor 43 and the wireless device 44 are configured as an operation unit 55. That is, the operation unit 55 is fitted into the body 12 (see FIG. 1). The equipment storage room 45 stores a power generator and other equipment used for fire fighting activities. The equipment storage chamber 45 is opened and closed by sliding the shutter 48.

<Structure of foam device>

  FIG. 5 is a front view of the foam device 17. 6 to 8 are a right side view, a left side view, and a bottom view of the foam device 17, respectively.

  The foam device 17 is disposed inside the body 12 of the fire engine 10. The foam device 17 includes a main pipe 61 and a bypass pipe 62.

  The main pipe 61 includes a first port 63 and a second port 64, and both communicate with each other. The first port 63 is connected to the discharge port of the fire pump 13. That is, high-pressure fire-fighting water discharged from the fire-fighting pump is guided to the first port 63. The main pipe 61 includes a switching valve 65. The switching valve 65 opens and closes the main pipe 61 and allows or blocks water flow between the first port 63 and the second port 64.

  The bypass pipe 62 includes an input port 66 and an output port 67, and both are in communication. The input port 66 is connected to the vicinity of the first port 63 of the main pipe 61, and the output port 67 is connected to the vicinity of the second port 64 of the main pipe 61. That is, when the switching valve 65 closes the main pipe 61, the fire extinguishing water is sent from the first port 63 to the second port 64 via the input port 66, the bypass pipe 62, and the output port 67. The bypass pipe 62 is provided with a check valve 68, and fire water is restricted from flowing from the output port 67 side to the input port 66 side.

  As described above, the fire engine 10 includes the water tank 15 and the chemical tank 16. The fire pump 13 guides high-pressure fire-fighting water to the first port 63. When the switching valve 65 opens the main pipe 61, the high-pressure fire extinguishing water is discharged from the water discharge ports 34 and 35 provided in the body 12 through the second port 64. As a result, normal water discharge and fire extinguishing activities are performed. On the other hand, when the switching valve 65 closes the main pipe 61, the high-pressure fire-extinguishing water is sent from the first port 63 to the bypass pipe 62, and fire-extinguishing bubbles are generated as described later. The fire-extinguishing foam is discharged from the water discharge port 34, and the foam fire-extinguishing activity is performed.

  9 is a cross-sectional view taken along the line IX-IX in FIG. This figure is a sectional view of the bypass pipe 62. FIG. 10 is a cross-sectional perspective view of the foam device 17 cut along the IX-IX cross section.

  As shown in FIGS. 9 and 10, the bypass pipe 62 includes a chemical liquid mixing unit 69. The chemical liquid mixing unit 69 includes a casing 71, a water supply unit 72 (water pipe), a fire extinguishing liquid supply unit 73 (digestion liquid pipe), and a discharge unit 74 (discharge pipe). As shown in FIGS. 6 to 8, the chemical liquid mixing unit 69 includes a compressed air supply unit 75 (air pipe). When the switching valve 65 closes the main pipe 61, the high-pressure fire-fighting water fed from the fire pump 13 is sent to the water supply unit 72. The fire extinguishing liquid is fed to the fire extinguishing liquid supply unit 73 by the stock solution pump 18 (see FIG. 4). Further, the air compressed by the vacuum pump 14 is supplied to the compressed air supply unit 75.

  FIG. 11 is an enlarged cross-sectional perspective view of the chemical liquid mixing unit 69.

  The casing 71 is made of stainless steel, for example. As shown in the figure, a mixing chamber 76 is formed inside the casing 71. The water supply unit 72 is provided on the first side surface 77 of the casing 71. The water supply unit 72 passes through the first side surface 77 and communicates with the mixing chamber 76. The fire extinguishing liquid supply unit 73 is provided on the second side surface 78 of the casing 71. The second side surface 78 is orthogonal to the first side surface 77. The fire extinguishing liquid supply unit 73 passes through the second side surface 78 and communicates with the mixing chamber 76. Therefore, the fire-extinguishing water supply direction and the fire-extinguishing liquid supply direction are orthogonal to each other, and the supplied fire-extinguishing water and the fire extinguishing liquid collide in an orthogonal state in the mixing chamber 76. 6-8, the compressed air supply part 74 is provided in the 3rd side surface 79 (refer FIG. 7) of the casing 71. As shown in FIG. The third side surface 79 is orthogonal to the first side surface 77 and is also orthogonal to the second side surface 78. The compressed air supply unit 74 passes through the third side surface 79 and communicates with the mixing chamber (see FIG. 11). Therefore, the compressed air supply direction is orthogonal to the fire-extinguishing water supply direction and the fire-extinguishing liquid supply direction.

  That is, the fire-extinguishing water, the fire-extinguishing liquid, and the compressed air are mixed at the same time in the mixing chamber 76. In the mixing chamber 76, the fire-extinguishing water, the fire-extinguishing liquid, and the compressed air collide with each other in an orthogonal state. The effects of fire extinguishing water, fire extinguishing liquid, and compressed air being orthogonal to each other will be described later.

  As shown in FIGS. 10 and 11, a hole communicating with the mixing chamber 76 is provided in the fourth side surface 80 of the casing. The fourth side surface 80 is a surface facing the first side surface 71. A pressure sensor 81 is connected to a hole provided in the fourth side surface 80. Moreover, the discharge part 74 is provided in the 5th side 82 of the casing. The fifth side surface 82 is a surface facing the second side surface 78. The discharge part 74 is connected to a connection port 83 provided on the fifth side surface 82. That is, the discharge unit 74 passes through the fifth side surface 82 and communicates with the mixing chamber 76. Therefore, when fire-extinguishing water, fire-extinguishing liquid, and compressed air are mixed in the mixing chamber 76 (hereinafter, a mixture of fire-extinguishing water, fire-extinguishing liquid, and compressed air is simply referred to as “mixture”), the mixture is It is sent from the discharge section 74 to the second port 64 of the main pipe 61 via the output port 67 (see FIG. 10).

<Stirring member>

  As shown in FIGS. 9 to 11, the foam device 17 includes a stirring member 85. The stirring member 85 is disposed at a boundary portion between the mixing chamber 76 and the discharge portion 74 of the casing 71. The stirring member 85 collides with the mixture when the mixture is sent from the mixing chamber 76 to the discharge unit 74. As a result, the fire-extinguishing water, the fire-extinguishing liquid, and the compressed air are vigorously stirred to generate fire-extinguishing bubbles.

  FIG. 12 is an enlarged view of the stirring member 85. 13 is an XIII-arrow view in FIG. 12, and FIG. 14 is an XIV-arrow view in FIG.

  The stirring member 85 includes two stirring disks 86 and 87 and a connecting rod 88 that connects them (see FIGS. 9 and 11). The stirring disk 86 is made of stainless steel or other metal or resin having excellent corrosion resistance. As shown in FIGS. 12 and 13, the stirring disk 86 is an annular disk member. Specifically, the stirring disk 86 is made of a thin circular plate-like member, and a circular through hole 89 is provided at the center. As shown in FIG. 11, the stirring disk 86 is disposed so as to face the fifth side surface 82 of the casing 71. Since the stirring disk 86 is formed in an annular shape, the diameter of the connection port of the discharge unit 74 is reduced by the stirring disk 86. In other words, the stirring disk 86 reduces the flow path area of the discharge unit 74.

  Three support tongues 90 (projections) are formed on the periphery of the through-hole 89 of the stirring disk 86. These support tongues 90 are provided radially on the periphery of the through hole 89. That is, the support tongue 90 is disposed symmetrically about the virtual central axis 50 of the discharge portion 74 and protrudes toward the center side of the through-hole 89 (in the radial direction of the discharge portion 74). One end of the connecting rod 88 is supported and fixed to the support tongue 90. The effect of providing the supporting tongue piece 90 will be described later.

  A plurality of small holes 91 are provided in the outer edge portion of the stirring disk 86. These small holes 91 penetrate the stirring disk 86 in the discharge direction of the mixture. In the present embodiment, six small holes 91 are provided, but the number of small holes 91 is not particularly limited. As shown in FIG. 11, each small hole 91 is exposed to the inside of the connection port 83 and the discharge portion 74 with the stirring member 85 attached. Therefore, a part of the mixture passes through the small holes 91 when moving from the mixing chamber 76 of the casing 71 to the discharge unit 74. The effect of the mixture passing through the small hole 91 will be described later.

  Like the stirring disk 86, the stirring disk 87 is made of stainless steel or other metal or resin having excellent corrosion resistance. As shown in FIGS. 12 and 14, the stirring disk 87 is made of a thin circular plate member. As shown in FIGS. 11 and 12, the stirring disk 87 is disposed so as to face the stirring disk 86, and is disposed on the deeper side of the discharge portion 74 than the stirring disk 86. That is, the stirring disk 86 and the stirring disk 87 are arranged in parallel in the discharge direction of the mixture. The outer diameter of the stirring disk 87 is smaller than the outer diameter of the stirring disk 86. For this reason, a part (central part) of the discharge part 74 is blocked by the stirring disk 87, and the mixture or fire-extinguishing foam is sent to the output port 67 through the gap between the stirring disk 87 and the inner wall surface of the discharge part 74. It is done. Similar to the stirring disk 86, a circular through hole may be provided in the center of the stirring disk 87.

  Three support tongues 92 (projections) are formed on the outer peripheral edge of the stirring disk 87. These support tongues 92 are provided radially on the outer peripheral edge of the stirring disk 87. That is, the support tongues 92 are arranged symmetrically about the virtual central axis 50 of the discharge unit 74 and project toward the radially outer side of the discharge unit 74. In the present embodiment, these supporting tongue pieces 92 are opposed to the supporting tongue pieces 90 of the stirring disk 86. The other end of the connecting rod 88 is supported and fixed to the support tongue 92. That is, the connecting tongue 88 is bridged between the support tongue piece 90 and the support tongue piece 92, whereby the support tongue piece 90 and the support tongue piece 92 are connected. The effect by providing this support tongue piece 92 is also mentioned later.

<Work and effects such as water discharge>

  This fire engine 10 performs operations such as water discharge at the fire site in the following manner.

  First, when a normal water discharge and fire extinguishing operation is performed, the switching valve 65 (see FIG. 5) opens the main pipe 61. As a result, the high-pressure fire-fighting water supplied from the fire pump 13 to the first port 63 of the foam device 17 is discharged through the second port 64.

  When the switching valve 65 closes the main pipe 61, foam extinguishing activity is performed. As shown in FIGS. 10 and 11, fire-extinguishing water is sent from the water supply unit 72 into the mixing chamber 76 of the casing 71. Further, the fire extinguishing liquid is sent from the fire extinguishing liquid supply unit 73 into the mixing chamber 76. Further, as shown in FIG. 8, compressed air is sent from the compressed air supply unit 75 to the mixing chamber 76. These are mixed in the mixing chamber 76 to generate fire-extinguishing bubbles. At this time, fire-extinguishing water, fire-extinguishing liquid, and air are mixed in the mixing chamber 76 at the same time, so that they are mixed uniformly. That is, air is uniformly mixed with the mixed liquid of the fire-extinguishing water and the fire-extinguishing liquid, and thereby the fire-extinguishing bubbles are efficiently generated.

  Thus, since the foam apparatus 17 which concerns on this embodiment mixes fire-extinguishing water, a fire-extinguishing liquid, and air simultaneously, the production | generation efficiency of the fire-extinguishing foam is high. Accordingly, the amount of fire-fighting foam generated per unit amount of the fire-extinguishing liquid increases. As a result, the fire engine 10 equipped with the foam device 17 can release a large amount of fire-fighting foam from a small amount of fire-extinguishing liquid, and exhibits a high fire-extinguishing capability.

  Moreover, in this embodiment, the fire-extinguishing water, the fire-extinguishing liquid, and the compressed air collide with each other at right angles. That is, fire-extinguishing water, fire-extinguishing liquid, and air collide violently in the mixing chamber 76 (see FIG. 11). For this reason, air is more uniformly mixed with the mixed liquid of the fire-extinguishing water and the fire-extinguishing liquid, and the fire-extinguishing bubbles are generated more efficiently.

  Furthermore, in the present embodiment, since the stirring member 85 is provided, the mixture collides with the stirring member 85 when the mixture of fire-fighting water, fire-extinguishing liquid, and air is sent from the mixing chamber 76 to the discharge unit 74. The flow of the three parties is disturbed. That is, the mixed liquid and air are mixed more uniformly, and more efficient fire-fighting bubbles are generated.

  In particular, the stirring member 85 includes the stirring disk 86, and has an advantage that it can be manufactured at a low cost with a simple structure. Moreover, since the stirring disk 86 is arranged so as to reduce the flow path area of the discharge part 74, it functions as a throttle provided in the discharge part 74. Therefore, the flow of the mixture is further disturbed when the mixture of fire-fighting water, fire-extinguishing liquid, and air is sent from the mixing chamber 76 to the discharge unit 74. That is, the mixed liquid and air are mixed more uniformly, and more efficient generation of fire-extinguishing bubbles is realized. In addition, since the stirring disk 86 includes a support tongue 90 that protrudes to the inside of the discharge portion 74, the flow of the mixture is further disturbed, and fire-extinguishing bubbles are generated more efficiently.

  In the present embodiment, the stirring disk 86 includes a plurality of support tongues 90, and the support tongues 90 are arranged in a radial pattern, so that a mixture of fire-extinguishing water, fire-extinguishing liquid, and air is used. The flow is evenly disturbed inside the discharge unit 74. Therefore, the liquid mixture and air are evenly mixed and fire-extinguishing bubbles are efficiently generated.

  Furthermore, in this embodiment, the stirring member 85 is provided with the stirring disk 87, and this stirring disk 87 is arranged in parallel in the discharge direction of the foam for fire extinguishing. As a result, the flow of the mixture is more turbulent. Therefore, there exists an advantage that the said liquid mixture and air mix more uniformly. In the present embodiment, the stirring member 85 includes two stirring disks 86 and 87, but the number of stirring disks is not particularly limited. Therefore, three or more stirring disks may be provided.

  In addition, the stirring disk 86 includes the small hole 91. A mixture of fire-fighting water, fire-extinguishing liquid, and air is sent from the mixing chamber 76 to the discharge unit 74, and at this time, a part of the mixture passes through the small hole 91. The small holes 91 function as a throttle that communicates from the mixing chamber 76 to the discharge unit 74, and are extremely vigorously mixed when the mixture passes through the small holes 91. Therefore, there exists an advantage that the said liquid mixture and air mix more uniformly.

  The present invention can be applied to a fire engine and a compressed air bubble device mounted on a fire engine.

FIG. 1 is an outfit view of a fire engine equipped with a compressed air bubble device according to an embodiment of the present invention. FIG. 2 is an outfit view of a fire engine equipped with a compressed air bubble device according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a fire engine equipped with a compressed air bubble device according to an embodiment of the present invention. FIG. 4 is a piping system diagram of a fire engine according to an embodiment of the present invention. FIG. 5 is a front view of the compressed air bubble device according to the embodiment of the present invention. FIG. 6 is a right side view of the compressed air bubble device according to the embodiment of the present invention. FIG. 7 is a left side view of the compressed air bubble device according to the embodiment of the present invention. FIG. 8 is a bottom view of the compressed air bubble device according to the embodiment of the present invention. 9 is a cross-sectional view taken along the line IX-IX in FIG. FIG. 10 is a cross-sectional perspective view of a compressed air bubble device according to an embodiment of the present invention. FIG. 11 is an enlarged cross-sectional perspective view of a chemical liquid mixing unit of the compressed air foam device according to the embodiment of the present invention. FIG. 12 is an enlarged view of the stirring member of the compressed air bubble device according to the embodiment of the present invention. 13 is a view taken in the direction of arrow XIII in FIG. 14 is a view taken along the line XIV-arrow in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fire engine 13 ... Fire pump 14 ... Vacuum pump 15 ... Water tank 16 ... Chemical tank 17 ... Foam device 18 ... Stock solution pump 50 ... Center shaft 61 ... -Main pipe 62 ... Bypass pipe 63 ... 1st port 64 ... 2nd port 65 ... Switching valve 66 ... Input port 67 ... Output port 69 ... Chemical liquid mixing part 71 ... Casing 72 ... Water supply unit 73 ... Fire extinguishing liquid supply unit 74 ... Discharge unit 75 ... Compressed air supply unit 76 ... Mixing chamber 77 ... First side surface 78 ... Second Side surface 79 ... Third side surface 80 ... Fourth side surface 81 ... Pressure sensor 82 ... Fifth side surface 83 ... Connection port 85 ... Stirring member 86 ... Stirring disk 87 ... Stirring disk 88 ... Connecting rod 89 ... Through hole 90 ... Support tongue Piece 91 ... small hole 92 ... support tongue piece

Claims (8)

A casing having a mixing chamber in which water, fire-extinguishing liquid and air are mixed to generate a fire-extinguishing foam;
Water piping for supplying water to the mixing chamber;
A fire-extinguishing liquid pipe for supplying a fire-extinguishing liquid to the mixing chamber;
An air pipe for supplying air to the mixing chamber;
A discharge pipe for discharging fire-extinguishing foam generated in the mixing chamber;
The water pipe, the fire extinguishing liquid pipe, and the air pipe are compressed air bubble devices that are connected to the casing so that water, the fire extinguishing liquid, and air are simultaneously mixed in the mixing chamber.   The compressed air bubble apparatus according to claim 1, wherein the water pipe, the fire extinguishing liquid pipe, and the air pipe are arranged so that a water supply direction, a fire extinguishing liquid supply direction, and an air supply direction are orthogonal to each other.   The compressed air foam apparatus according to claim 1 or 2, wherein a stirring member that stirs water, a fire-extinguishing liquid, and air to generate a fire-extinguishing foam is provided at a boundary portion between the mixing chamber and the discharge pipe.   The compressed air bubble device according to claim 3, wherein the stirring member is an annular disk disposed so as to reduce a flow passage area of the discharge pipe, and includes a projecting piece protruding inward in a radial direction of the discharge pipe.   The compressed air bubble device according to claim 4, wherein the agitating member includes a plurality of projecting pieces, and each projecting piece is arranged symmetrically about the central axis of the discharge pipe.   The compressed air bubble apparatus according to any one of claims 3 to 5, wherein a plurality of stirring members are arranged in parallel in the discharge direction of the fire-extinguishing foam.   The compressed air bubble device according to any one of claims 3 to 6, wherein the stirring member includes a small hole penetrating in a discharge direction of the fire-extinguishing foam. A fire engine equipped with the compressed air bubble device according to any one of claims 1 to 7.

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