CN115364407B

CN115364407B - Telescopic fire-fighting foam foamer, system and foaming method

Info

Publication number: CN115364407B
Application number: CN202211062462.7A
Authority: CN
Inventors: 田志坚; 王忠伟; 崔金一; 刘文方; 赵阳光
Original assignee: XCMG Fire Fighting Safety Equipment Co Ltd
Current assignee: XCMG Fire Fighting Safety Equipment Co Ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2023-07-25
Anticipated expiration: 2042-08-31
Also published as: CN115364407A

Abstract

The invention discloses a telescopic fire-fighting foam foamer, a telescopic fire-fighting foam foamer system and a telescopic fire-fighting foam foamer method, which relate to the technical field of compressed gas foam extinguishment and are used for improving the foaming effect of fire-fighting foam. The telescopic fire-fighting foam foamer includes: at least one first pipe and a second pipe which are nested at one stage, wherein one end of the second pipe is nested inside the first pipe, and the other end of the second pipe is positioned outside the first pipe; a connection support part mounted at one end of the second pipe, the second pipe being slidably mounted to the first pipe through the connection support part; and a baffle plate mounted to the connection support portion. According to the technical scheme, after the conveyed foam flows into the first pipe, under the action of the baffle, the large foam formed in the conveying process of the foam can be crushed again to form uniform small foam, so that the foaming effect is improved, and the fire extinguishing performance of the foam is improved; and secondary foaming is automatically achieved during foam delivery.

Description

Telescopic fire-fighting foam foamer, system and foaming method

Technical Field

The invention relates to the technical field of compressed gas foam fire extinguishment, in particular to a telescopic fire-fighting foam foamer, a telescopic fire-fighting foam foamer system and a telescopic fire-fighting foam foamer method.

Background

The compressed gas foam system is a novel fire extinguishing system and comprises a fire pump, a compressed gas system, a foam proportion mixing system, a spraying device, a pipeline system and the like. The compressed gas foam system is used to generate compressed gas foam to extinguish a fire. Compressed gas foam systems are divided into mobile systems and stationary systems, for example: the compressed gas foam fire truck is provided with a movable vehicle-mounted compressed gas foam system, and the ultra-high voltage converter station is provided with a fixed compressed gas foam system.

The compressed gas foam is a bubble group with smaller granularity, fine and uniform foam structure and the surface surrounded by a liquid film, and because of small specific gravity and certain viscosity, the compressed gas foam not only can float on the surface of general combustible liquid to form a foam covering layer, but also can be adhered on the surface of general combustible solid, so that the compressed gas foam is a fire extinguishing agent with high fire extinguishing efficiency and small water consumption, and is recommended to be used in various fields and places such as petroleum, chemical industry, storage, transformer substations and the like. In recent years, the research of fire extinguishing technology also proves that the compressed gas foam is obviously superior to the common fire-fighting foam generated at a foam muzzle or through a foam generator by the traditional negative pressure suction principle in the aspects of foam liquid separation time, stability, fire extinguishing and anti-reburning efficacy and the like.

The petrochemical industry involves inflammable and explosive substances in a large variety and large quantity, once a fire disaster occurs, the combustion speed is high, the fire disaster development is rapid, a large-area three-dimensional fire disaster is easy to form, the afterburning is easy to occur, and the putting out difficulty is high. The flow rate of the foam mixed liquid of the positive pressure foam system which is mature at present is 20-100L/s, and once the full liquid level combustion occurs in an oil tank or a flammable liquid storage tank of 5-10 ten thousand cubes in petrochemical enterprises, the flow rate of the foam mixed liquid of the positive pressure foam system which is needed for putting out the storage tank is more than 120-200L/s in supply strength, so that the rapid coverage of the combustion liquid level can be realized. To achieve this supply strength, the stationary system of the tank farm is currently implemented with a plurality of foam systems.

The inventors found that at least the following problems exist in the prior art: the respective spraying devices are uniformly installed on the storage tank, so that only the composition cost of the fire extinguishing system is increased, and the foam can be reliably delivered and sprayed to the ignition site. However, for compressed gas foam fire trucks, the compressed gas foam system is unable to supply large flows of compressed foam, so it is difficult to achieve a longer fire monitor range and a greater fire job range. Therefore, there is a need to develop a high flow compressed gas foam production device to meet the high efficiency and economic demands of large petrochemical fire suppression.

Disclosure of Invention

The invention provides a telescopic fire-fighting foam foamer, a telescopic fire-fighting foam foamer system and a telescopic fire-fighting foam foamer method, which are used for improving the foaming effect of fire-fighting foam.

The embodiment of the invention provides a telescopic fire-fighting foam foamer, which comprises the following components:

at least one first pipe and a second pipe which are nested at one stage, wherein one end of the second pipe is nested inside the first pipe, and the other end of the second pipe is positioned outside the first pipe;

a connection support part mounted at one end of the second pipe, the second pipe being slidably mounted to the first pipe through the connection support part; and

and the baffle is arranged on the connecting support part.

In some embodiments, the ratio of the diameter of the first tube to the diameter of the second tube is 1.14 to 1.16.

In some embodiments, the connection support includes an overflow aperture therethrough; the ratio of the diameter of the overflow hole to the diameter of the second pipe is 1.05-1.1.

In some embodiments, the axial length of the connection support portion is 0.3 to 0.5 times the diameter of the overflow hole.

In some embodiments, the inner wall of the overflow aperture of the connection support portion smoothly transitions with the inner wall of the second tube.

In some embodiments, the number of baffles is a plurality, and the plurality of baffles are distributed along the circumference of the flow-through hole.

In some embodiments, one end of each baffle is fixedly connected with the connection supporting part, and the other end of each baffle is close to the central axis of the overflow hole; the other ends of all the baffles are located on the same circumference, and the diameter of the circumference is 0.5-0.7 times of the diameter of the second pipe.

In some embodiments, the distance between the other end of the baffle plate and the central axis of the overflow hole is 0.25-0.35 times the diameter of the overflow hole.

In some embodiments, the baffle extends in a radial direction of the second tube, the baffle having a maximum extent parallel to a cross-section of the second tube.

In some embodiments, the baffle is configured to be tapered and the cone angle β of the baffle is 5 ° to 10 °.

The embodiment of the invention provides a fire-fighting foam foaming system, which comprises:

a fire fighting foam foaming device configured to foam the foam mixture and the compressed gas into fire fighting foam; and

according to the telescopic fire-fighting foam foamer provided by any one of the technical schemes, the telescopic fire-fighting foam foamer is arranged at the downstream of the fire-fighting foam foamer and connected in series, so that the fire-fighting foam conveyed by the fire-fighting foam foamer can be foamed at least once.

In some embodiments, the fire fighting foam foaming device includes:

a two-phase flow injection seat comprising a first flow path and a second flow path which are mutually independent;

the air nozzle assembly comprises a liquid inlet hole, an air inlet hole, a first air outlet hole and a flow guide part; the liquid inlet is in fluid communication with the first flow path and is downstream of the first flow path; the intake port is in fluid communication with the second flow path and downstream of the second flow path; and

a foam mixing chamber downstream of and in fluid communication with both the first flow path and the second flow path; the first air outlet hole and the flow guiding part extend into the foam mixing chamber; the first air outlet holes and the flow guide are configured such that the air flow output via the air nozzle assembly flows to different positions in the radial direction of the foam mixing chamber.

In some embodiments, the flow guide comprises:

and the second air outlet hole and the first air outlet hole are positioned at different positions in the radial direction of the foam mixing chamber.

In some embodiments, the air nozzle assembly comprises:

the mounting plate is attached to and fixed with the two-phase flow injection seat; the mounting plate is provided with the air inlet hole which is in fluid communication with the second flow path of the two-phase flow injection seat;

An axial tube mounted on a side of the mounting plate remote from the two-phase flow injection seat; the axis of the axial tube is parallel to the central axis of the two-phase flow injection seat; the axial tube is in fluid communication with the air inlet aperture of the mounting plate; and

the axial flow injection device comprises an axial flow injection seat, a radial pipe and a flow injection device, wherein the central axis of the radial pipe is intersected with the central axis of the axial pipe, one end of the radial pipe is in fluid communication with the axial pipe, and the other end of the radial pipe is positioned on one side of the axial pipe, which faces the central axis of the two-phase flow injection seat.

In some embodiments, the number of axial tubes is a plurality, the plurality of axial tubes being distributed around the circumference of the mounting plate.

In some embodiments, the other end of the axial tube is remote from the two-phase flow injection seat; the other end of the axial tube is used as the first air outlet hole and is open; the other end of the axial tube faces the inner wall of the foam mixing chamber.

In some embodiments, the other end of the radial tube is remote from the axial tube, the other end of the radial tube being closed; the side wall of the radial pipe, which is close to the other end of the axial pipe, is provided with the second air outlet hole;

the axis direction of the second air outlet hole is parallel to the central axis of the two-phase flow injection seat, or the axis direction of the second air outlet hole is intersected with the central axis of the two-phase flow injection seat, and the included angle is smaller than 90 degrees.

In some embodiments, the flow guide comprises:

the guide plate is positioned near the first air outlet hole; the deflector is configured to deflect a portion of the airflow output via the first air outlet to a position proximate to a central axis of the foam mixing chamber.

In some embodiments, the air nozzle assembly further comprises:

the mounting plate is attached to and fixed with the two-phase flow injection seat; the mounting plate is provided with the liquid inlet hole which is in fluid communication with the first flow path of the two-phase flow injection seat and the air inlet hole which is in fluid communication with the second flow path; and

an axial tube mounted on a side of the mounting plate remote from the two-phase flow injection seat; the axis of the axial tube is parallel to the central axis of the two-phase flow injection seat; the axial tube is in fluid communication with the air inlet aperture of the mounting plate;

wherein the baffle is fixedly connected with the axial tube, and the baffle is constructed to be pore-free; the baffle is configured to create a negative pressure region on a side thereof remote from the mounting plate such that a portion of the airflow output by the axial tube flows to the negative pressure region.

In some embodiments, the first flow path is located on a central axis of the two-phase flow injection seat; the second flow path is located outside the first flow path in a radial direction of the two-phase flow injection seat.

In some embodiments, the fire fighting foam foaming system further comprises:

a first inlet pipe, the first flow path being downstream of and in fluid communication with the first inlet pipe; and

a first outlet tube is mounted downstream of the foam mixing chamber.

In some embodiments, the inner wall of the foam mixing chamber is configured to be tapered; the flow area of the inlet of the foam mixing chamber is greater than the flow area of the outlet of the foam mixing chamber.

In some embodiments, the fire fighting foam foaming system further comprises:

a gas supply flow path located upstream of the second flow path of the two-phase flow injection seat to supply gas to the two-phase flow injection seat;

a foam concentrate supply flow path located upstream of the first flow path of the two-phase stream injection seat to supply foam concentrate to the two-phase stream injection seat; and

a water supply flow path is also located upstream of the first flow path of the two-phase flow injection seat to provide water to the two-phase flow injection seat.

In some embodiments, the fire fighting foam foaming system further comprises:

a water spraying branch which is arranged in parallel with the fire-fighting foam foaming device; one end of the water spray branch is in fluid communication with the water supply flow path; the other end of the water spraying branch is connected with the first outlet pipe in parallel; and

A foam spraying branch communicated with the water supply flow path; the foam-injection branch is located between the water supply flow path and the first flow path and is in fluid communication with both the water supply flow path and the first flow path;

wherein the water supply flow path is in selective fluid communication with at least one of the water spray branch, the foam spray branch.

In some embodiments, the fire fighting foam foaming system further comprises:

a delivery tube in fluid communication with the firefighting foam foamer, the delivery tube being downstream of the firefighting foam foamer; and

and the revolving body is connected with the conveying pipe.

In some embodiments, the fire fighting foam foaming system further comprises:

and the ejector is arranged at the downstream of the conveying pipe.

In some embodiments, the length of the conduit between the fire fighting foam device and the fire fighting foam foamer is greater than or equal to 10-20 times the maximum diameter of the conduit.

The embodiment of the invention provides a fire-fighting foam foaming method, which is realized by adopting the fire-fighting foam foaming system provided by any technical scheme of the invention, and comprises the following steps:

when the foam extinguishing agent needs to be sprayed, the foam extinguishing agent is sprayed according to the set first flow velocity V _MI Delivering a foam mixture to a first inlet pipe of the fire fighting foam foaming device;

according to the set second flow velocity V _G Delivering compressed gas to a second flow path of a two-phase flow injection seat of the fire fighting foam foaming device;

according to the set third flow velocity V _F1 And conveying the fluid output by the fire-fighting foam foaming device to a telescopic fire-fighting foam foamer.

In some embodiments, the V _Ml 6-8 m/s; and/or VG is 8-15 m/s; and/or, the V _F1 5-10 m/s; and/or the number of the groups of groups,

the foam mixture injection apparent flow velocity at the inlet of the foam mixing chamber of the fire-fighting foam foaming device is V _1I ，V _1I 2m/s to 5m/s; and/or

The compressed gas injection apparent flow velocity at the inlet of the foam mixing chamber of the fire-fighting foam foaming device is V _1G ，V _1G 10-20 m/s; and/or

The apparent flow velocity of the foam flowing out at the outlet of the foam mixing chamber of the fire-fighting foam foaming device is V ₁₀ ，V ₁₀ 4m/s to 8m/s.

In some embodiments, the fire fighting foam foaming method further comprises the steps of:

according to the set fourth flow velocity V _F2 And conveying the fluid output by the telescopic fire fighting foam foamer to an ejector.

In some embodiments, the V _F2 Is 6-12 m/s.

The telescopic fire-fighting foam foamer provided by the technical scheme is particularly suitable for a high-flow compressed gas foam system, and can be used for secondary foaming of the foam conveyed by other foaming devices. In the process of conveying the high-flow compressed gas foam, because the flow of the fire-fighting pipeline is high, on one hand, the foam mixed liquid which is only foamed once can be foamed incompletely; on the other hand, the phenomenon that the foam is easy to break due to more direction changes or diameter changes in pipeline transportation, and gas overflows from a bubble flow to be integrated into large bubbles and the like exists. The telescopic fire-fighting foam foamer is a part of a conveying pipeline and comprises a connecting supporting part, a baffle plate, at least one first pipe and at least one second pipe which are nested, wherein after conveyed foam flows into the first pipe, large foam can be crushed again under the action of the baffle plate so as to form uniform small foam, so that the foaming effect is improved, and the fire-fighting performance of the foam is improved; and secondary foaming is automatically achieved during foam delivery.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 is a schematic diagram of the composition of a fire fighting foam foaming system according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a fire-fighting foam foaming device of the fire-fighting foam foaming system according to the embodiment of the invention.

FIG. 3 is a schematic cross-sectional view A-A of FIG. 2.

Fig. 4 is a schematic cross-sectional view of B-B of fig. 2.

Fig. 5 is a schematic view of the structure of an air nozzle assembly of a fire-fighting foam foaming device of the fire-fighting foam foaming system according to the embodiment of the invention.

Fig. 6 is a schematic structural view of a fire fighting foam foaming device of a fire fighting foam foaming system according to other embodiments of the present invention.

FIG. 7 is a schematic cross-sectional view of M-M of FIG. 6.

Fig. 8 is a schematic view of the N-N cross section of fig. 6.

Fig. 9 is a schematic P cross-sectional view of fig. 6.

Fig. 10 is a schematic structural view of a telescopic fire-fighting foam foamer of the fire-fighting foam foaming system according to the embodiment of the invention.

Fig. 11 is an enlarged partial schematic view of one end of fig. 10.

Fig. 12 is an M-direction schematic diagram of fig. 10.

Fig. 13 is an N-directional schematic diagram of fig. 10.

Fig. 14 is a schematic diagram of a fire fighting foam foaming method according to an embodiment of the present invention.

Reference numerals:

100. a fire fighting foam foaming device; 200. a gas supply channel; 300. a foam raw liquid supply channel; 400. a water supply channel; 500. a water spraying branch; 600. a foam spraying branch; 700. a telescopic fire fighting foam foamer; 810. a delivery tube; 820. a revolving body; 830. an ejector; 840. a foam mixed liquid switch valve; 850. a controller;

110. a two-phase stream injection seat; 120. an air nozzle assembly; 130. a foam mixing chamber; 140. a first inlet pipe; 150. a first outlet tube;

111. a first flow path; 112. a second flow path;

121. a liquid inlet hole; 122. an air inlet hole; 123. a first air outlet hole; 124', a second gas outlet; 125. a mounting plate; 126. an axial tube; 127. a radial tube; 124. a flow guiding part;

201. an air compressor; 202. a gas distribution valve; 203. a cooler; 204. a first gas filter; 205. a second gas filter; 206. an air flow meter; 207. a one-way valve; 208. a first pressure gauge; 209. an intake throttle valve;

300a, a foam concentrate suction branch; 300b, flushing the branch; 301. a foam imbibition valve; 302. flushing a water inlet valve; 303. a foam pump; 304. a check valve; 305. a foam flow meter; 306. a foam stock solution interface;

401. A filter; 402. a water pump; 403. a vacuum pump; 404. a check valve; 405. a vacuum gauge; 406. a water flow meter; 407. a water inlet pipe interface;

501. a first switching valve; 601. a second switching valve; 602. a second pressure gauge;

703. a first tube; 704. a second tube; 705. a connection support part; 706. a baffle; 706', a baffle; 706', baffles; 705a, an overflow aperture; 71. an outer tube; 72. a middle tube; 73. an inner tube; 711. a first flange; 712. a first sleeve; 721. a first piston; 722. a second sleeve; 731. a second piston; 732. and a second flange.

Detailed Description

The technical scheme provided by the invention is described in more detail below with reference to fig. 1 to 14.

The inventor finds that in the fire-fighting industry, the foam mixing devices of the prior mature and reliable medium-small compressed gas foam system (the flow rate of the foam mixed liquid is 20-100L/s) are all formed by connecting one static mixer or a plurality of static mixers in series/parallel to form a group which is connected in a pipeline, and the foam mixing device has the advantages of simple structure, reliable performance and no need of additional driving force. These static mixers can in principle be divided into two main categories, one starting from the design of different fluid mixing injection structures, such as: (1) mixing the gas phase flow or the liquid phase flow into a plurality of finer flow beams to be injected into the external interface of the other phase flow, (2) mixing the gas phase flow or the liquid phase flow into a plurality of finer flow beams to be injected into the interior of the other phase flow; the other category starts from designing different spoiler structures, such as stacked mesh plates, spiral deflectors, three-dimensional grid plates, conical spoilers and the like. These designs are all finally in order to make the gas phase flow be better dispersed by the liquid phase flow, make the two-phase flow can mix more even under the impact of spoiler, become the bubble flow that the granule is tiny, foam distributes evenly. Of course, in order to enhance the foaming effect of the two types of static mixers, some designs are based on the above, and a variable diameter structure of a venturi tube or a Laval tube is designed in a front pipeline and a rear pipeline connected with the static mixer, so that the effect of mutually impacting and mixing two-phase flows is further enhanced.

The mechanism of the compressed gas foam system for generating foam is that foam stock solution and water are uniformly mixed according to a certain proportion, then the foam mixed solution is mixed with compressed gas for foaming, namely, the compressed gas with a certain proportion is injected into the foam mixed solution, and the foam is generated after the two-phase flow is impacted and mixed.

The stability, foamability and fire extinguishing performance of the fire-fighting foam formed by injecting the compressed gas are closely related to the physical properties of the foam stock solution, water and gas, the foam stock solution chemical composition and the like, and the main factors influencing the properties in the preparation process are the factors such as the ratio of the foam mixed solution, the gas-liquid ratio, the mixing pressure, the contact area of the gas-liquid two-phase surface, the two-phase mixing uniformity and the like.

The generation of the compressed gas foam is actually a mixing and conveying process of a gas-liquid two-phase flow, and the inventor finds that the gas-liquid two-phase flow can form five flow patterns according to the difference of injection gas speed and liquid speed, pipe diameter and fluid property: annular flow, plug flow, liquid throttle, bubble flow, mist flow, wherein when the main body presents a bubble flow type, the foam formation quality is best, the average bubble size is small, the number is large, and the bubbles are uniformly dispersed in the continuous liquid phase.

The existing shaping products and engineering practice show that the process control of the foam mixed liquid proportion, the gas-liquid ratio, the mixing pressure and the like in the compressed gas foam system forms the mature and reliable technology in industry, but the mature technology and process are not formed in the aspects of the control of the gas-liquid two-phase surface contact area and the two-phase mixing uniformity. Especially for the high-flow compressed gas foam system with the foam mixed liquid flow rate more than 150L/s, as the two-phase flow rate is obviously increased, in order to reduce the pipeline pressure loss, the diameters of the fire-fighting foam foamer and related conveying pipelines are correspondingly obviously increased, and the contact area and the path for fully mixing and foaming the gas-liquid two-phase flow are difficult to be provided by the foam mixing device structure of the compressed gas foam system which is originally suitable for the compressed gas foam system with the flow rate less than or equal to 100L/s, so that new problems appear in use, such as: (1) the original uniformly mixed bubble flow cannot be achieved, and the foam quality is deteriorated; (2) excessive overflow pressure loss of the foam mixing device; (3) the space occupation of the device is large, and the device is difficult to be placed on a vehicle; (4) complex structure, poor reliability, etc.

After further research, the inventor finds that under the condition that the chemical components of the foam raw liquid and the physical properties of the foam raw liquid, water and gas are determined, two links mainly exist for actually influencing the preparation quality of the fire fighting foam in a high-flow compressed gas foam system: i.e. one is the mixing foaming effect of the foam mixing chamber and the other is the development change in the pipeline transport after foaming.

Therefore, the inventor provides a fire-fighting foam foaming device suitable for a high-flow compressed gas foam system, which can meet the successful application in a vehicle-mounted or fixed system and realize better fire-fighting efficiency. The fire-fighting foam foaming device achieves the remarkable effects in three aspects, namely: firstly, realizing more uniform and finer mixed foam of large-flow two-phase flow; secondly, the pressure loss of the pipeline is reduced, and the compressed gas foam can obtain a longer spraying distance; thirdly, the structure is simple and reliable, and the space occupation position is small.

The terms or terminology used herein are interpreted.

Fire-fighting foam is a bubble group with small volume and surface surrounded by liquid film for fire-fighting and fire-extinguishing. Because the specific gravity is much smaller than that of a general flammable liquid, the liquid can float on the surface of the liquid to form a foam coating. Meanwhile, the fire-fighting foam has certain viscosity and can be adhered to the surface of a general combustible solid.

The preparation method of the fire fighting foam comprises the following steps: firstly, uniformly mixing foam stock solution and water according to a certain proportion, then mixing the foam mixed solution and gas for foaming, and finally forming the fire extinguishing agent-fire fighting foam with fire extinguishing effect.

The quality and fire-extinguishing performance of the fire-fighting foam are mainly related to the physical properties of foam stock solution, water and gas, the ratio of foam mixed solution, the ratio of gas to liquid, the mixing pressure, the uniformity of gas to liquid mixing, the contact area of the surfaces of gas and liquid phases and the like.

Foam stock solution: a concentrated liquid which can be mixed with water in a suitable mixing ratio to form a foam solution.

Foam mixed solution: foam solution prepared by mixing foam solution and water according to a specific mixing ratio.

Foaming multiple: ratio of foam volume to foam mixture volume forming the foam. Low-fold foam: fire extinguishing foam with a foaming multiple of less than 20. Wet foam: foam with a foaming multiple of less than 10 times. Dry foam: a foam having a foaming multiple of not less than 10 times.

Compressed gas foam fire engine: the fire engine is mainly provided with a water tank and a foam liquid tank, and foam fire is sprayed by a compressed gas foam system to extinguish fire.

Foam proportioning system: the system consists of a foam proportion mixer, a foam raw liquid pump, a control device, a pipeline device and other parts, and can mix water and foam raw liquid according to a certain proportion.

Compressed gas foam system: mainly comprises a fire pump, a compressed gas system, a foam proportion mixing system, a spraying device, a pipeline system and the like, and can generate compressed gas foam.

Terms and dimension herein are specified.

D1 is the diameter of the first flow path 111 and also the diameter of the first inlet pipe 140.

D2 is the inlet diameter of the foam mixing chamber 130.

D3 is the diameter of the first outlet tube 150 and is also the outlet diameter of the foam mixing chamber 130.

D4 is the diameter of the circumferential surface where the other ends of all the radial pipes 127 are located.

d3 is the diameter of the circumferential surface where the other ends of all the baffles 702 are located.

L1 is the axial length of the foam mixing chamber 130.

L5 is the length of the baffle 124 ".

L6 is the width of the other end of the baffle 124 ".

Delta is the cone angle of the baffle 124 ".

Referring to fig. 1 to 2, an embodiment of the present invention provides a fire fighting foam foaming device 100 for forming foam from a foam mixture under the action of compressed gas. The fire fighting foam foaming device 100 includes a two-phase flow injection seat 110, an air nozzle assembly 120, and a foam mixing chamber 130. The two-phase flow injection seat 110 includes a first flow path 111 and a second flow path 112 that are independent of each other. Referring to fig. 2 and 5, the air nozzle assembly 120 includes an inlet aperture 121, an inlet aperture 122, a first outlet aperture 123, and a second outlet aperture 124'. The inlet 121 is in fluid communication with the first flow path 111, and the inlet 121 is downstream of the first flow path 111. The intake apertures 122 are in fluid communication with the second flow path 112 and are located downstream of the second flow path 112. The foam mixing chamber 130 is installed downstream of the first flow path 111 and the second flow path 112, and is in fluid communication with the first flow path 111 and the second flow path 112; the first air outlet hole 123 and the second air outlet hole 124' extend into the foam mixing chamber 130; the first and second air outlet holes 123 and 124' are located at different positions in the radial direction of the foam mixing chamber 130.

The two-phase flow injection seat 110 is used for receiving foam mixture and compressed gas. After entering the two-phase flow injection seat 110, the foam mixture flows directly along the first flow path 111 to the foam mixing chamber 130. After the compressed gas enters the two-phase flow injection seat 110, it enters the air nozzle assembly 120 along the second flow path 112, and then enters the foam mixing chamber 130 from the air nozzle assembly 120, and interacts with the foam mixture entering the foam mixing chamber 130 to generate fire fighting foam.

To facilitate connection of the fire fighting foam device 100 to other components, referring to fig. 2, in some embodiments the fire fighting foam device 100 further comprises a first inlet pipe 140 and a first outlet pipe 150. The first flow path 111 is downstream of the first inlet tube 140 and is in fluid communication with the first inlet tube 140. A first outlet tube 150 is mounted downstream of the foam mixing chamber 130.

The specific implementation of the various parts of the fire fighting foam device 100 will be described in detail below in terms of the flow path of fluid into the fire fighting foam device 100.

As introduced above, the fluids entering the fire fighting foam device 100 fall into two categories: foam mixed liquid and compressed gas. The foam mixed liquid is a mixture of foam stock solution and water. Wherein the foam mixture enters the first flow path 111 of the two-phase flow injection seat 110 from the first inlet pipe 140, and the fluid entering the first flow path 111 flows along the solid line arrow S1, see fig. 2. The compressed gas is introduced into the two-phase flow injection seat 110 from the external line of the fire fighting foam foaming device 100 along the second flow path 112, and the fluid introduced into the second flow path 112 flows along the dotted arrow S2, see fig. 2.

Specifically, referring to fig. 2, the foaming mixture is transferred into the first inlet pipe 140 and then the foaming mixture is introduced into the first flow path 111 of the two-phase stream injection seat 110 along the first inlet pipe 140. The central axis of the first inlet pipe 140 coincides with the central axis of the two-phase stream injection seat 110. The foam mixture in the first flow path 111 of the two-phase flow injection seat 110 then flows into the liquid inlet holes 121 of the air nozzle assembly 120, see fig. 5. The liquid inlet hole 121 is located at the middle position of the air nozzle assembly 120, and the central axis of the liquid inlet hole 121 is also coincident with the central axis of the two-phase flow injection seat 110. The flow area of the liquid inlet 121 is slightly larger than the flow area of the first inlet pipe 140 and also slightly larger than the flow area of the first flow path 111 of the two-phase flow injection seat 110. Here, the first inlet pipe 140 and the first flow path 111 are each cylindrical in shape. The foam mixture then flows out of the inlet aperture 121 of the air nozzle assembly 120 and then into the foam mixing chamber 130 awaiting mixing with the compressed gas output from the second flow path 112 of the two-phase flow injection seat 110 to foam to obtain foam.

With continued reference to fig. 2, the compressed gas enters the second flow path 112 of the two-phase flow injection seat 110 from an external conduit and then enters the air nozzle assembly 120 along the air inlet aperture 122 of the air nozzle assembly 120. Referring to fig. 5, the compressed gas entering the gas nozzle assembly 120 is split into two streams, one stream exiting the gas nozzle assembly 120 from the first outlet aperture 123, stream S21; the other stream exits the air nozzle assembly 120, i.e., stream S22, from the second exit aperture 124'. The first outlet aperture 123 has a diameter D5 and the second outlet aperture 124' has a diameter D6.

Referring to fig. 2, in some embodiments, the first flow path 111 is located on the central axis of the two-phase flow injection seat 110; the first flow path 111 is specifically an intake port 122 penetrating the two-phase flow injection seat 110 in its own axial direction. The second flow path 112 includes two sections, a first section branch is an air hole extending along the radial direction of the two-phase flow injection seat 110, and a second section branch is an annular groove with an axis parallel to the axial direction of the two-phase flow injection seat 110, and the annular groove is in fluid communication with the air hole of the first section branch. The external compressed gas firstly enters the first section branch and then flows to the second section branch. The second flow path 112 is located outside the first flow path 111 in the radial direction of the two-phase flow injection seat 110. The two-phase flow injection seat 110 adopts such a structure, so that the first flow path 111 and the second flow path 112 can be independent, are not in series flow and are not communicated with each other, and also have a certain overlapping area in the axial direction of the two-phase flow injection seat 110. The space size of the two-phase flow injection seat 110 is effectively utilized, and the two-phase flow injection seat 110 occupies a small structural volume and has a compact and reasonable structure.

The air nozzle assembly 120 is fixedly connected to the two-phase stream injection seat 110. The air intake aperture 122 of the air nozzle assembly 120 is located downstream of the second flow path 112 of the two-phase flow injection seat 110.

The compressed gas entering the air nozzle assembly 120 is split and emitted through the first and second gas outlet holes 123, 124'. The first and second air outlet holes 123 and 124' are located at different positions in the radial direction of the foam mixing chamber 130 as viewed in the radial direction of the foam mixing chamber 130. The first air outlet hole 123 is closer to the radial edge of the foam mixing chamber 130 and the second air outlet hole 124' is closer to the central axis of the foam mixing chamber 130.

The air nozzle assembly 120 adopts the structure, so that the compressed gas is fully mixed from the outer surface and the inner part of the foam mixed liquid column, the contact area between the compressed gas and foam and water is enlarged, and the first air outlet holes 123 and 123 are positioned in the foam mixing chamber 130, so that the overcurrent pressure loss caused by the occupation position of the air nozzle assembly 120 is effectively reduced.

Referring to fig. 2 and 5, in some embodiments, the air nozzle assembly 120 includes a mounting plate 125, an axial tube 126, and a radial tube 127. The mounting plate 125 is a flat plate, and preferably has a thickness that is as thin as possible to meet the requirements of the fixed mounting, so that the entire fire fighting foam foaming device 100 is more compact and compact. The mounting plate 125 is attached and fixed to the two-phase flow injection seat 110, specifically, bolting, welding, riveting, or the like. The mounting plate 125 is provided with an air inlet hole 122 in fluid communication with the second flow path 112 of the two-phase flow injection seat 110, and a liquid inlet hole 121 in fluid communication with the first flow path 111. An axial tube 126 is mounted on a side of the mounting plate 125 remote from the two-phase flow injection seat 110, and the axial tube 126 and the mounting plate 125 are welded and fixed. The axis of the radial tube 127 is perpendicular to the central axis of the two-phase flow injection block 110. The axial tube 126 is in fluid communication with the inlet aperture 122 of the mounting plate 125. Compressed gas enters the axial tube 126 along the inlet aperture 122 of the mounting plate 125. The central axis of the radial tube 127 intersects the central axis of the axial tube 126, and one end of the radial tube 127 is in fluid communication with the axial tube 126, specifically, the radial tube 127 is mounted to the axial tube 126 near the downstream end. This configuration provides the radial tube 127 with an axial distance from the inlet of the foam mixing chamber 130 such that the foam mixture interacts with the compressed gas output from the radial tube 127 in a relatively steady state. The other end of the radial tube 127 remote from the axial tube 126 is located on the side of the axial tube 126 facing the central axis of the two-phase flow injection seat 110.

In the above technical solution, the compressed gas output by the axial tube 126 interacts with the portion of the liquid column formed by the foam mixed liquid located in the circumferential surface area, and the compressed gas output by the radial tube 127 can extend into the central position of the foam mixed liquid to interact with the portion of the liquid column formed by the foam mixed liquid located in the central area, so that the contact area between the compressed gas and the foam mixed liquid is greatly increased, and the foaming effect is improved. Also, the arrangement of the axial tube 126 and the radial tube 127 reduces the resistance to fluid impingement.

With continued reference to FIG. 2, in some embodiments, the other end of the radial tube 127 is remote from the axial tube 126, and the other end of the radial tube 127 is closed; the side wall of the radial tube 127, which is close to the other end of the axial tube 126, is provided with a second air outlet hole 124'; the axial direction of the second air outlet 124 'is parallel to the central axis of the two-phase flow injection seat 110, or the axial direction of the second air outlet 124' intersects with the central axis of the two-phase flow injection seat 110, and the included angle is smaller than 90 °.

With continued reference to fig. 2, in some embodiments, the other end of the axial tube 126 is remote from the two-phase flow injection seat 110, and the other end of the axial tube 126 is open as the first outlet aperture 123. The other end of the axial tube 126 faces the inner wall of the foam mixing chamber 130, i.e. the conical inner wall of the foam mixing chamber 130.

Referring to fig. 3 and 4, in some embodiments, the number of axial tubes 126 is multiple, such as 8-10, and the multiple axial tubes 126 are distributed around the circumference of the mounting plate 125, which may be uniform. This arrangement allows the compressed gas output from the axial tube 126 to interact at multiple locations along the circumferential surface area of the column of liquid formed by the foam mixture to enhance the foaming effect.

Referring to fig. 3 and 4, in some embodiments, the number of radial tubes 127 is multiple, such as between 8 and 10. The axial tubes 126 and the radial tubes 127 are arranged in one-to-one correspondence.

Referring to fig. 2, 3, or 5, in some embodiments, each axial tube 126 is provided with a first outlet aperture 123. Each radial tube 127 is provided with a plurality of second gas outlet holes 124'. The first air outlet holes 123 have a relatively large flow area, and each of the second air outlet holes 124' is a micropore. In some embodiments, the flow area of the other end of the axial tube 126 is 1.5-2 times the flow area of all the second gas outlet holes 124' of the radial tube 127 that are in fluid communication with the axial tube 126. The distance H1 (see fig. 2) from the stem tip of the middle portion of the foam mixing chamber 130, into which the radial tube 127 is inserted, is 0.15 to 0.2 times the inflow path D1 (see fig. 2) of the foam mixture of the two-phase flow injection block 110, so that the air flow outputted from the radial tube 127 sufficiently interacts with the interior of the foam mixture.

With continued reference to fig. 3 and 4, in some embodiments, the other ends of all radial tubes 127 are located on the same circumferential surface, and the diameter D4 of the circumferential surface is 0.3-0.4 times the diameter D1 of the first flow path 111.

In some embodiments, the diameter of the first flow path 111 and the diameter of the first inlet tube 140 are equal, both being D1. The first outlet tube 150 has a diameter D3. In some embodiments, the flow area of the first inlet tube 140 is the same as the flow area of the first outlet tube 150. I.e. D1 and D3 are equal.

According to the technical scheme, the axial pipe 126 and the radial pipe 127 are adopted to output compressed gas, so that the compressed gas is fully mixed from the outer surface and the inner part of the foam mixed liquid column, the contact area of two-phase flow is enlarged, the excessive pressure loss is reduced, the resistance of filling the compressed gas is reduced, the path of gas-liquid opposite flushing stirring is optimized, and the foaming effects of more uniform mixing and smaller foam granularity are realized.

In addition, in the above technical solution, the air nozzle assembly 120 is located inside the cylindrical hole of the foam mixing chamber 130, and the air nozzle assembly 120 adopts a reasonable T-shaped axial hole design, so as to ensure that the minimum flow area of the foam mixing chamber 130 is not smaller than the inflow area of the foam mixture of the two-phase flow injection seat 110. The fire-fighting foam foaming device 100 realizes the full mixing of compressed gas from the outer surface and the inner part of the foam mixed liquid column, enlarges the contact area of two-phase flow, and effectively reduces the overcurrent pressure loss caused by the occupation of the air nozzle. The air nozzle assembly 120 is designed by reasonable number of spray holes and structural size, so that the minimum flow area of the foam mixing chamber 130 is not smaller than the foam mixing liquid inflow area of the two-phase flow injection seat 110.

With continued reference to fig. 2, the inner wall of the foam mixing chamber 130 is configured to be tapered; the flow area of the inlet of the foam mixing chamber 130 is greater than the flow area of the outlet of the foam mixing chamber 130, i.e., D2 is greater than D3.

The foam mixing chamber 130 adopts a conical column shape and a variable cross section design, so that when the foam mixed liquid flows through the foam mixing chamber 130, a relatively low-pressure area is formed at the position close to the conical surface, which is beneficial to the injection and mixing of the first air outlet hole 123 and the second air outlet hole 124', and on the other hand, most of compressed gas collides with the conical surface and liquid phase nearby the conical surface through the first air outlet hole 123 parallel to the axis of the conveying pipeline, and is stirred and impacted with the liquid phase after being reflected by the conical surface, so that the foaming effect with more uniform mixing and smaller foam granularity is realized.

In some embodiments, the axial length of the foam mixing chamber 130 is L1, the outlet diameter of the foam mixing chamber 130 is D3, and L1 is 0.35 to 0.5 times D3.

In some embodiments, the inner wall of the foam mixing chamber 130 is angled at θ, which is 40 ° to 50 °, from the central axis of the foam mixing chamber 130.

As described above, the inside of the foam mixing chamber 130 is configured as a tapered cylindrical variable cross-section hole, and the foam outflow taper hole diameter D3 of the foam mixing chamber 130 is the same as the foam mixture inflow hole diameter D1 of the two-phase flow injection seat 110, and the cylindrical hole diameter D2 of the foam mixing chamber 130 is 1.5 times the taper hole diameter D3. I.e. the inlet diameter D2 of the foam mixing chamber 130 is 1.3 to 1.7 times, such as in particular 1.5 times, the outlet diameter D3 of the foam mixing chamber 130. By adopting the proportion parameters, the foaming effect is effectively improved.

In some embodiments, the axial length L1 of the foam mixing chamber 130 is 0.4-0.6 times, such as 0.4 times, 0.5 times, 0.6 times, in particular, the outlet diameter D3 of the foam mixing chamber 130. By adopting the proportion parameters, the foaming time length is in a better range, and the foaming effect is greatly improved.

By adopting the parameters, the pipeline pressure loss is reduced, the foaming quality is improved, and a foam flow which is more uniform and has better fire extinguishing performance is formed.

Referring to fig. 6 to 9, further embodiments are described below.

The difference between this embodiment and the above embodiment is that the implementation of the diversion portion 124 is different. The flow guiding portion 124 specifically includes a flow guiding plate 124", where the flow guiding plate 124" is located near the first air outlet hole 123. The deflector 124″ is configured to deflect a portion of the air flow outputted through the first air outlet hole 123 to a position near the central axis of the foam mixing chamber 130.

In the above embodiments, the flow guiding portion 124 employs the second air outlet hole 124'. Since the second air outlet 124 'is located at a different position from the first air outlet 123 in the radial direction of the foam mixing chamber 130, the air flow exiting from the second air outlet 124' is closer to the central axis region of the foam mixing liquid column, and the air flow exiting from the first air outlet 123 is closer to the circumferential surface region of the foam mixing liquid column.

However, in the present embodiment, the air flow is entirely output into the foam mixing chamber 130 via the first air outlet hole 123. The surface of the baffle 124 "blocks the foam mixture entering the foam mixing chamber 130, so that a negative pressure area a is formed downstream in the flow direction of the foam mixture, i.e. on the side of the baffle 124" facing away from the mounting plate 125, which negative pressure area makes less foam mixture there. The compressed gas output through the first gas outlet hole 123 can smoothly enter the region and be mixed with the foam mixture therein. The negative pressure area a and the first air outlet 123 are also located at different positions in the radial direction of the foam mixing chamber 130, so that the compressed air entering the foam mixing chamber 130 has the compressed air acting on the central axis area and the circumferential surface area of the foam mixing liquid column.

Referring to fig. 9, from the P-direction, the baffle 124 "is trapezoidal, and one end of the baffle 124" connected to the axial tube 126 is thicker, and the other end of the baffle 124 "is thinner. L5 is 15-30 mm, L6 is 5-8 mm. The cone angle of the baffle 124″ is δ, and δ is 15 ° to 25 °, specifically 15 °, 18 °, 20 °, 22 °, 25 °, and the like.

Referring to fig. 7, the inlet diameter D2 of the foam mixing chamber 130 is larger than the outlet diameter D3 of the foam mixing chamber 130, and a low pressure area is formed at the annular wall space of the conical cavity to facilitate the entry of compressed gas by using the fluid flow in the first flow path 111; and the side of baffle 124 "remote from plate 125 will also form low pressure area a.

According to the technical scheme, after the liquid flow passes through the air nozzle assembly 120, the low-pressure area A formed on the back surface of the air nozzle assembly is skillfully utilized to guide the compressed gas to reflect through the inner conical surface of the foam mixing chamber 130, and the compressed gas enters the middle part of the foam mixing chamber 130 along the back surface of the air nozzle assembly 120, so that the compressed gas is fully mixed from the outer surface and the inner part of the foam mixing liquid column, the contact area of the two-phase flow is enlarged, and the excessive pressure loss caused by the occupation space of the air nozzle assembly 120 is effectively reduced.

Referring to fig. 1, further embodiments of the present invention provide a fire fighting foam foaming system, which includes a gas supply flow path 200, a foam concentrate supply flow path 300, a water supply flow path 400, and a fire fighting foam foaming device 100 according to any of the embodiments of the present invention. The gas supply flow path 200 is located upstream of the second flow path 112 of the two-phase flow injection seat 110 to supply gas to the two-phase flow injection seat 110. The foaming liquid supply flow path 300 is located upstream of the first inlet pipe 140 to supply the foaming liquid to the first inlet pipe 140. The water supply flow path 400 is also located upstream of the first inlet pipe 140 to supply water to the first inlet pipe 140.

The structure, principles, and specific implementations of the fire fighting foam foaming system along the flow direction of each fluid are described in detail below.

First, a portion for supplying compressed gas will be described. The gas supply flow path 200 is used to supply compressed gas to the second flow path 112 of the two-phase flow injection seat 110 of the fire fighting foam foaming device 100 described above.

Referring to fig. 1, in some embodiments, a gas supply flow path 200 includes an air compressor 201, a gas distribution valve 202, and a cooler 203. The components are in fluid communication through a pipeline. The air compressor 201 is configured to supply compressed gas. Upstream of the air compressor 201, an intake throttle 209 may also be provided to adjust the amount of intake air. Upstream of the intake throttle 209, a first air filter 204 may also be provided to filter impurities in the air. Downstream of the air compressor 201, a second air filter 205 is provided to filter out impurities in the compressed gas output from the air compressor 201.

In order to accurately detect the pressure of the compressed gas in the gas supply flow path 200, a first pressure gauge 208 is provided in the pipe between the gas distribution valve 202 and the second air filter 205 to detect the pressure of the compressed gas in the pipe.

A gas distribution valve 202 is provided downstream of the second air filter 205, and the gas distribution valve 202 is specifically installed in a pipeline downstream of the second air filter 205. The gas distribution valve 202 is used for distributing the compressed gas output from the air compressor 201 to provide the compressed gas to the fire fighting foam foaming device 100 according to the set flow rate parameter. Downstream of the gas distribution valve 202, a cooler 203 is provided. The cooler 203 is used to adjust the temperature of the compressed gas output from the gas distribution valve 202 so that the compressed gas enters the second flow path 112 of the fire fighting foam foaming device 100 according to a set temperature requirement.

In order to precisely control the flow rate of the compressed gas output from the gas supply flow path 200 to the second flow path 112, the gas supply flow path 200 further includes an air flow meter 206. An air flow meter 206 is located downstream of the cooler 203. The flow of compressed gas in the pipeline is collected by an air flow meter 206.

With continued reference to fig. 1, in some embodiments, the gas supply flow path 200 further includes a one-way valve 207, the one-way valve 207 being positioned between the air flow meter 206 and the second flow path 112 such that compressed gas can only flow from the air flow meter 206 to the second flow path 112 and cannot flow back. Moreover, the possibility of reverse channeling of the first flow path liquid into the gas path in the foam foaming device 100 is eliminated in some cases.

In some embodiments, the fire fighting foam foaming system further includes a controller 850, the controller 850 being communicatively coupled to the air compressor 201, the air intake throttle 209, the first pressure gauge 208, the gas distribution valve 202, and the air flow meter 206. The controller 850 controls the working states of the air compressor 201, the air intake throttle valve 209 and the gas distribution valve 202 according to the state parameters collected by the water flow meter 406, the second pressure meter 602, the second switching valve 601, the foam mixed liquid switch valve 840, the first pressure meter 208 and the air flow meter 206 to extinguish fire so that the parameters of the compressed gas entering the second flow path 112 of the two-phase flow injection seat 110 of the fire-fighting foam foaming device 100 meet the requirements. Parameters such as flow, apparent flow, also called flow, etc.

With continued reference to fig. 1, a foam concentrate supply flow path 300 is described. The foam concentrate supply flow path 300 is used to supply the foam concentrate to the first flow path 111 of the two-phase flow injection seat 110 of the fire fighting foam foaming device 100 described above.

In some embodiments, the foam concentrate supply flow path 300 includes a foam suction valve 301, a rinse water inlet valve 302, and a foam pump 303. The components are in fluid communication through a pipeline.

Referring to fig. 1, a foam pump 303 is used to pump foam. Two branches are provided upstream of the foam pump 303: foam concentrate is drawn into the branch 300a and the rinse branch 300b. The foam concentrate suction branch 300a is used to supply foam concentrate to the foam pump 303, and the flushing branch 300b supplies flushing water to the foam pump 303 when it is necessary to flush each component of the foam concentrate supply flow path 300.

Referring to fig. 1, a foam-liquid suction valve 301 is located in the foam-liquid suction branch 300a, and the foam-liquid suction valve 301 is configured to communicate with a foam-liquid interface 306.

A flush inlet valve 302 is positioned in the flush arm 300b, the flush inlet valve 302 being configured to communicate with a flush water port. A flush inlet valve 302 is arranged in parallel with the foam suction valve 301.

A foam pump 303 is located downstream of the foam suction valve 301 and the flush inlet valve 302. If desired, one of the foam suction valve 301 and the flush inlet valve 302 may be in a conductive state and fluid may flow through the valve in the conductive state.

To accurately detect the pressure of the foam concentrate pumped by the foam pump 303, in some embodiments, the foam concentrate supply flow path 300 includes a check valve 304. The check valve 304 is used to allow one-way flow of foam in the foam pump 303 line, placing back flow.

To accurately detect the flow rate of the foam concentrate pumped by the foam pump 303, in some embodiments, the foam concentrate supply flow path 300 includes a foam flow meter 305. Foam flow meter 305 is used to detect foam flow in the pipeline.

In some embodiments, foam suction valve 301, flush inlet valve 302, foam pump 303, foam flow meter 305, foam mix switch valve 840 are all communicatively coupled to controller 850. The controller 850 is configured to control the respective operating states of the foam suction valve 301, the flushing water inlet valve 302, and the foam pump 303 according to the state parameters detected by the water flow meter 406, the second pressure gauge 602, the second switching valve 601, the foam mix switch valve 840, the foam flow meter 305, the check valve 304, and the specific requirements for fire extinguishment.

With continued reference to fig. 1, a water supply flow path 400 is described below. According to the specific requirements of fire extinguishment, the fire-fighting foam foaming system can independently output water, and can also output dry foam and wet foam.

Referring to fig. 1, in some embodiments, the fire fighting foam foaming system further includes a water supply flow path 400. The water supply flow path 400 includes a filter 401, a water pump 402, a vacuum pump 403, and a check valve 404, and the components requiring fluid communication are in fluid communication via piping. A water pump 402 is installed downstream of the filter 401; a vacuum pump 403 is in communication with the tubing between the filter 401 and the water pump 402 to pump the gas from the length of tubing; a check valve 404 is mounted downstream of the water pump 402.

The water supplied from the water supply passage 400 may be used to generate foam mixture and fire-fighting foam, or may be used directly for fire-extinguishing. To accomplish the above-described switching of functions, referring to fig. 1, in some embodiments, the fire fighting foam foaming system further includes a water spray branch 500 and a foam spray branch 600.

If water is required as the fire extinguishing agent, the water spray branch 500 is in an on state, and the foam spray branch 600 is opened, and at this time, the water supplied from the water supply flow path 400 does not flow to the first flow path 111 of the two-phase flow injection seat 110 of the fire fighting foam foaming device 100, but directly flows to the water spray branch 500, and then is outputted as the fire extinguishing agent.

If foam is desired as the fire suppressant, the water spray branch 500 is open and the foam spray branch 600 is in an on state. At this time, the water supplied from the water supply path 400 is mixed with the foam concentrate supplied from the foam concentrate supply path 300 along the foam spray path 600, and then enters the first path 111 of the two-phase flow injection seat 110, and then cooperates with the compressed gas supplied from the gas supply path 200, so as to obtain the fire fighting foam.

Specifically, the water spray branch 500 is arranged in parallel with the foam spray branch 600; one end of the water spray branch 500 is in fluid communication with the water supply flow path 400; the other end of the water spray branch 500 is connected in parallel with the first outlet pipe 150. The foam spraying branch 600 communicates with the water supply flow path 400; the foam-spraying branch 600 is located between the water supply flow path 400 and the first flow path 111. The foam spray branch 600 is in fluid communication with the water supply flow path 400 and the first flow path 111. Wherein the water supply flow path 400 is selectively in fluid communication with at least one of the water spray branch 500, the foam spray branch 600.

Referring to fig. 1, in some embodiments, the fire fighting foam foaming system further comprises a first switching valve 501 and/or a second switching valve 601. The first switching valve 501 is installed at the water spraying branch 500; a second switching valve 601 is mounted to the foam-injection branch 600. The first switching valve 501 is in a conducting state, and the water spraying branch 500 allows water to pass through; the first switching valve 501 is in an off state and the water spray branch 500 does not allow water to pass. The second switching valve 601 is in a conducting state, and the foam spraying branch 600 allows water to pass through; the second switching valve 601 is in an open state and the foam-injection branch 600 does not allow water to pass.

An external or fire engine is supplied to the water supply passage 400 through the water inlet pipe port 407, flows through the filter 401, and is pumped downstream by the water pump 402. A vacuum pump 403 and a vacuum gauge 405 are installed on the piping between the water pump 402 and the filter 401 to evacuate the piping when required. After flowing through the water pump 402, the water flows through the check valve 404 and the water flow meter 406, and then flows to the water spraying branch 500 and the foam spraying branch 600 in a switchable manner. When the pressurized water supply is employed, the vacuum pump 403 does not need to operate; when a low water source is pumped, the vacuum pump 403 is used to draw a vacuum between the water pump 402 and the inlet pipe to achieve suction.

First option: when the water flows to the foam spraying branch 600, the second switching valve 601 is in an on state, the first switching valve 501 is in an off state, and all the water conveyed by the water pump 402 enters the first flow path 111 of the two-phase flow injection seat 110 of the fire fighting foam foaming device 100 through the foam spraying switching valve and is primarily mixed with the foam stock solution conveyed to the first flow path 111 of the two-phase flow injection seat 110 by the foam stock solution supply flow path 300, so as to form foam mixed solution. In order to more conveniently control whether foaming is required, a foam mixture switching valve 840 is provided at an inlet/outlet of the first flow path 111 of the two-phase flow injection seat 110, and both the foam concentrate supply flow path 300 and the water supply flow path 400 are located upstream of the foam mixture switching valve 840. The foam concentrate fed through the foam concentrate feed passage 300 and the water fed through the water feed passage 400 are joined at the foam mixture switching valve 840. The foam mix on-off valve 840 is also communicatively coupled to the controller 850 described above, and the controller 850 controls parameters such as the on, off state, and opening of the foam mix on-off valve 840.

In some embodiments, a second pressure gauge 602 is installed on the pipeline between the upstream of the second switching valve 601 and the downstream of the water flow meter 406, the second pressure gauge 602 detecting the water pressure in the pipeline so that the water is mixed with the foam concentrate at a set pressure. The second pressure gauge 602 is communicatively connected to the controller 850 described above, and the parameters detected by the second pressure gauge 602 are sent to the controller 850, and the controller 850 controls the working states of the water pump 402, the vacuum pump 403, and the foam injection switch valve according to the parameters detected by the second pressure gauge 602.

A second option: the water pumped by the water pump 402 does not flow through the fire fighting foam device 100, and directly downstream of the fire fighting foam device 100. At this time, the second switching valve 601 is opened, and water cannot flow through the second switching valve 601. The first switching valve 501 is conductive, and water flows into the water spray branch 500 via the first switching valve 501, and finally flows to the foam sprayer 830 described later to be sprayed for fire extinguishment. The driving power of the water pump 402, the vacuum pump 403, the foam pump 303 and the air compressor 201 comes from a power device on the chassis of the fire engine, the water and foam stock solution comes from a water tank and a foam tank which are loaded on the chassis, and the controller 850 calls corresponding control programs according to the requirements of a fire-extinguishing site and different operation requirements of spraying water, wetting foam and drying foam according to signals collected by various sensors and operating instructions of operators, accurately prepares the mixed composition of the water, the foam stock solution and compressed gas, and realizes the water or foam injection fire-extinguishing with certain pressure and flow.

For a high-flow compressed air foam system, due to the high flow rate of the fire-fighting pipeline, after the compressed gas is processed by the fire-fighting foam foaming device 100, some insufficiently foamed air clusters may still exist, and in addition, due to the more direction changes or diameter changes in pipeline transportation, the formed foam (large amount), foam mixed liquid (small amount) and compressed gas (small amount) composite fluid may overflow from a bubble flow to form large bubbles through the pipeline. In order to improve the fire extinguishing effect, the bubble flow delivered via the fire fighting foam device 100 will be delivered to the fire fighting foam foamer 700 for re-refined segmentation and mixed foaming. Referring to fig. 1, a fire fighting foam foamer 700 is located downstream of the fire fighting foam foamer 100 and the water spray branch 500. The fire fighting foam foamer 700 plays a role of secondary foaming to improve the performance of the generated foam, making it more satisfactory for fire extinguishing, to play a better role in fire extinguishing.

Referring to fig. 10-13, implementations of a telescoping fire fighting foam foamer 700 provided in some embodiments of the invention are described below.

Preferably, the telescoping fire fighting foam foamer 700 is used in conjunction with other foaming devices to foam the foam generated by the other foaming devices once again, or even multiple times, during delivery. The number of foaming times is positively correlated with the number of stages of the multi-stage telescopic tube included in the telescopic fire fighting foam foamer 700.

Specifically, the telescoping fire fighting foam foamer 700 includes multiple stages of telescoping tubes. Specifically, the telescoping fire fighting foam foamer includes a connecting support 705, a baffle 706, and at least one first tube 703 and second tube 704 nested. One end of the second tube 704 is nested inside the first tube 703, and the other end of the second tube 704 is located outside the first tube 703. The connection support portion 705 is mounted to one end of the second tube 704, and the second tube 704 is slidably mounted to the first tube 703 through the connection support portion 705. The baffle 706 is mounted to the connection support portion 705.

Referring to fig. 10, the connection support portion 705 is mounted to one end of the second tube 72 such that the second tube 72 is slidably mounted to the first tube 71. The connection support portion 705 is specifically, for example, a piston or the like. Also taking three-joint pipe as an example, two connecting support parts 705 are adopted, and pistons are respectively marked as: a first piston 721, a second piston 731.

The greater the number of nested first tubes 703, second tubes 704, the greater the number of stages, which is related to the total number of segments of the tubes. Taking two-stage as an example, the telescoping fire fighting foam foamer 700 includes three tubes, labeled from the outside to the inside: an outer tube 71, an intermediate tube 72, and an inner tube 73. The intermediate tube 72 is nested inside the outer tube 71 forming a first stage of nesting. The inner tube 73 is nested inside the intermediate tube 72 forming a second level of nesting. For each stage of nesting, on the outside is a first tube 703 and on the inside is a second tube 704.

The above description is given by taking two-level nesting as an example, and if three-level nesting is adopted, four pipes are included, and the nesting manner is the same as that described above.

Referring to FIG. 2, the ratio of the diameter of the first tube 703 to the diameter of the second tube 704 is 1.14 to 1.16, specifically 1.14, 1.15, 1.16, for example. I.e., the ratio of the diameters of the outer tube 71 and the intermediate tube 72 is 1.14 to 1.16. The ratio of the diameters of the intermediate tube 72 and the inner tube 73 is also 1.14 to 1.16.

A first flange 711 is mounted at the trailing end of the outer tube 71 and a first set of outer tubes 712 is mounted at the leading end of the outer tube 71.

A first piston 721 as a connection support portion 705 is mounted to the rear end of the intermediate pipe 72, and a second intermediate pipe 722 is mounted to the head end of the intermediate pipe 72.

A second piston 731 as a connection support portion 705 is installed at the rear end of the inner pipe 73, and a second flange 732 is installed at the head end of the inner pipe 73.

A baffle 706 is also mounted at the end of both the intermediate tube 72 and the inner tube 73, and for ease of distinction, the baffle at the end of the intermediate tube 72 is designated 706 'and the baffle at the end of the inner tube 73 is designated 706'.

The diameters of the outer tube 71, the intermediate tube 72, and the inner tube 73 are respectively expressed as: d1, d2, d3.. d1:d2=1.14 to 1.16, d2:d3=1.14 to 1.16.

The first piston 721 and the second piston 731 each include a flat section and a convex section, the diameter of the flat section of the first piston 721 being denoted d21, and the diameter of the flat section of the second piston 731 being denoted d31. The lengths of the flat sections of the first piston 721 are labeled L21 and L31, respectively. L21= (0.3 to 0.5) d21, l31= (0.3 to 0.5) d31.

The width of the shutter 706 'mounted in the first piston 721 is L22, and the length of the shutter 706' along the axial direction of the first piston 721 is L23. L22=15 to 30mm, l23=15 to 20mm.

The width of the baffle 706 'mounted in the second piston 731 is L32, and the length of the baffle 706' along the axial direction of the second piston 731 is L33. L32=15 to 30mm, l33=15 to 20mm.

Referring to fig. 10, the connection support portion 705 includes an overflow hole 705a penetrating itself; the ratio of the diameter di1 of the flow-through hole 705a to the diameter di of the second pipe 704 is 1.05 to 1.1. Taking the example of the secondary sleeve shown in fig. 2, i.e., d21: d2 =1.05 to 1.1; d31: d3 =1.05 to 1.1. The diameter of the flow-through aperture 705a is smaller than the diameter of the first tube 703 and slightly larger than the diameter of the second tube 704. The inner wall of the overflow hole 705a of the connection support part 705 smoothly transitions with the inner wall of the second pipe 704 so that the fluid flowing property in the telescopic fire fighting foam foamer is better. The axial length of the connection support portion 705 is 0.3 to 0.5 times the diameter of the flow-through hole 705 a.

Referring to fig. 10 to 11, the number of baffles 706 is plural, specifically, for example, 10 to 15 baffles 706 are installed for each second pipe 704. The plurality of baffles 706 are arranged dispersed along the circumferential direction of the flow-through hole 705 a.

Referring to fig. 10 to 13, one end of each baffle 706 is fixedly connected to the connection support portion 705, and the other end of each baffle 706 is close to the central axis of the flow-through hole 705 a; the other ends of all baffles 706 are located on the same circumference having a diameter of 0.5 to 0.7 times the diameter of the second pipe 704. That is, d22= (0.5 to 0.7) ×d2, d32= (0.5 to 0.7) ×d3. The area of the flow passing through the baffle 706 is 0.85 to 1 times the area of the flow passing through the inlet of the first tube 703.

Referring to fig. 10 and 11, the baffle 706 extends in a radial direction of the second tube 704, with the largest extension of the baffle 706 being parallel to the cross-section of the second tube 704. The baffle 706 is configured to be tapered, and the taper angle β of the baffle 706 is 5 ° to 10 °.

According to the technical scheme, the baffle 706 is arranged in the connecting support part 705, so that the gas-liquid two-phase flow is promoted to be uniformly dispersed again in the foam conveying process, and on one hand, the impact pressure loss during foam overflow is reduced; on the other hand, the device can better crush and run at the ring pipe wall again, large bubbles possibly overflowed due to the conditions of liquid throttling, plug flow and the like can form a plurality of turbulent eddies distributed from the ring pipe wall to the center of the pipeline after the tooth-shaped baffle plate, so that the gas-liquid two-phase flow is promoted to be uniformly dispersed again, and finer and uniform high-quality foam is finally formed, so that the fire extinguishing effect is improved.

The telescopic fire-fighting foam foamer 700 adopts the implementation mode, so that the pressure loss of mixed through flow is reduced, and foam can be promoted again in the conveying process; and the telescopic fire-fighting foam foamer 700 has compact structure and small space occupation, and each baffle 706 is in conical design along the radial direction of the second pipe 704, so that the impact pressure loss during foam overflow is reduced on one hand; on the other hand, the large bubbles which run on the annular pipe wall and overflow due to the conditions of liquid throttling, plug flow and the like can be better crushed again, a plurality of turbulent eddies distributed from the annular pipe wall to the center of the pipeline can be formed at the rear side, namely the downstream of the baffle 706, the gas-liquid two-phase flow is promoted to be uniformly dispersed again, and fine and uniform high-quality foam is finally formed, so that the fire extinguishing effect is improved.

The technical scheme is suitable for the scene requiring high-flow compressed air foam, the fire-fighting foam foaming system comprises the fire-fighting foam foaming device 100 and the telescopic fire-fighting foam foaming device 700 which are connected in series, the fire-fighting foam foaming device 100 is used for mixing and foaming compressed gas and foam mixed liquid injected by gas-liquid two-phase flow, namely, the first-stage foaming is realized, the telescopic fire-fighting foam foaming device 700 realizes the second-stage and third-stage multi-stage foaming, the telescopic fire-fighting foam foaming device 700 carries out the re-segmentation and mixed foaming on the large bubbles which are overflowed and integrated from the bubble flow due to the fact that the atmospheric mass which is still existing and is not fully dispersed in the foam mixed liquid after the first-stage telescopic fire-fighting foam foaming device 700 is processed and the direction change or the diameter change of a certain conveying distance. Proved by test verification of foam mixed liquid with the flow rate of 100-200L/s, the technical proposal has satisfactory foaming effect between 3-15 foaming times.

Returning to fig. 1, in some embodiments, the fire fighting foam foaming system further includes a delivery tube 810, the delivery tube 810 being in fluid communication with the fire fighting foam foamer 700, the delivery tube 810 being located downstream of the fire fighting foam foamer 700.

The foam generated through the multi-stage foaming is transported out through the transport pipe 810.

Referring to fig. 1, in some embodiments, the fire fighting foam foaming system further includes an injector 830, such as specifically a fire monitor. An ejector 830 is installed at the downstream end of the delivery pipe 810, and the foam is finally delivered from the delivery pipe 810 to the ejector 830 and then ejected for fire extinguishment. Foam apparent velocity V of the transfer line between fire foam foamer 700 and eductor 830 _F2 From 6m/s to 12m/s, so that the injector 830 emits fire-fighting foam with good and uniform quality.

Referring to fig. 1, in some embodiments, the length of the pipe between the fire fighting foam device 100 and the telescopic fire fighting foam foamer 700 is 10 to 20 times or more of the maximum diameter of the pipe to facilitate the stabilization of foam generation.

In order to reduce pipeline pressure loss and improve foaming quality and form uniform bubble flow, a fire-fighting foam foaming system adopts the following parameters: the foam mixed liquid conveying pipeline represents a first flow velocity V _Ml Is 6-8 m/s. The compressed gas conveying pipeline represents that the second flow rate VG is 8-15 m/s; the conveying line between the fire fighting foam device 100 and the telescopic fire fighting foam foamer 700 exhibits a third speed V _F1 Is 5-10 m/s. The fire fighting foam foamer 700 has an inlet apparent velocity equal to its outlet apparent velocity, both of V _F1 5-10 m/s. The line between the fire fighting foam foamer 700 and the ejector 830 delivers the appearance of foam at a fourth speed V _F2 Is 6-12 m/s.

The technical scheme is suitable for a high-flow compressed air foam system, has high foaming quality, small pipeline pressure loss, compact and exquisite foaming device structure, small space occupation and convenient use and maintenance.

Referring to fig. 13, an embodiment of the present invention provides a fire fighting foam foaming method, which is implemented by using the fire fighting foam foaming system provided by any one of the technical solutions of the present invention, and what is not described in this embodiment is referred to in the foregoing embodiments. The fire fighting foam foaming method comprises the following steps:

step S100, when the foam extinguishing agent needs to be sprayed, according to a set first flow velocity V _Ml The foam mixture is delivered to the first inlet pipe 140 of the fire fighting foam device 100. In some embodiments, V _Ml Is 6-8 m/s.

Step S200, according to the set second flow velocity V _G The compressed gas is supplied to the second flow path 112 of the two-phase flow injection seat 110 of the fire fighting foam device 100. In some embodiments, the second flow rate VG is 8-15 m/s. Step S100 is performed first, and step S200 is performed later, so that the initial jet flow is more stable.

In some embodiments, the fire fighting foam foaming method further comprises the step of S300: according to the set third flow velocity V _F1 The fluid output from the fire fighting foam foamer 100 is delivered to the fire fighting foam foamer 700. The foam apparent speed of the conveying pipeline between the two stages of foaming devices is the third flow speed V _F1 . In some embodiments, V _F1 Is 5m/s to 10m/s.

In some embodiments, the fire fighting foam foaming method further comprises the following step S400: according to the set fourth flow velocity V _F2 The fluid output from the fire fighting foam foamer 700 is delivered to an ejector 830. In some embodiments, V _F2 Is 6-12 m/s.

According to the technical scheme, due to the adoption of proper foaming parameters, the pipeline pressure loss can be effectively reduced, the foaming quality is improved, uniform bubble flow is formed, and the method is particularly suitable for a high-flow compressed air foam system.

In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present invention.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A telescoping fire fighting foam foamer, comprising:

at least one first stage of nested first tube (703) and second tube (704), one end of the second tube (704) being nested inside the first tube (703), the other end of the second tube (704) being located outside the first tube (703);

a connection support part (705) comprising an overflow hole (705 a); the connection support part (705) is mounted on one end of the second pipe (704), and the second pipe (704) is slidably mounted on the first pipe (703) through the connection support part (705); and

a baffle (706) mounted on the connection support part (705); the number of the baffles (706) is a plurality; one end of each baffle (706) is fixedly connected with the connecting support part (705), and the other end of each baffle (706) is close to the central axis of the overflow hole (705 a); the other ends of all the baffles (706) are located on the same circumference, the diameter of which is 0.5-0.7 times the diameter of the second pipe (704); the area of the overflow after passing through the baffle (706) is 0.85-1 times of the area of the overflow at the inlet of the first pipe (703).

2. The telescopic fire fighting foam foamer according to claim 1, characterized in that the ratio of the diameter of the first tube (703) to the diameter of the second tube (704) is 1.14-1.16.

3. The telescopic firefighting foam foamer of claim 1, wherein said connection support (705) includes an overflow hole (705 a) through itself; the ratio of the diameter of the overflow hole (705 a) to the diameter of the second pipe (704) is 1.05-1.1.

4. A telescopic fire fighting foam foamer according to claim 3, characterized in that the axial length of the connection support (705) is 0.3-0.5 times the diameter of the flow-through aperture (705 a).

5. A telescopic fire fighting foam foamer according to claim 3, characterized in that the inner wall of the flow-through hole (705 a) of the connection support (705) is smoothly transited with the inner wall of the second tube (704).

6. A telescopic fire fighting foam foamer according to claim 3, characterized in that a plurality of said baffles (706) are arranged dispersed along the circumference of said flow-through aperture (705 a).

7. A telescopic fire fighting foam foamer according to claim 3, characterized in that the distance between the other end of the baffle (706) and the central axis of the flow-through hole (705 a) is 0.25-0.35 times the diameter of the flow-through hole (705 a).

8. The telescopic fire fighting foam foamer according to claim 1, characterized in that the baffle (706) extends in the radial direction of the second tube (704), the largest extension of the baffle (706) being parallel to the cross section of the second tube (704).

9. The telescoping fire fighting foam foamer of claim 1 wherein said baffle (706) is configured to be tapered and the taper angle β of said baffle (706) is from 5 ° to 10 °.

10. A fire fighting foam foaming system, comprising:

a fire-fighting foam foaming device (100) configured to foam the compressed gas, foam mixture into fire-fighting foam; and

the telescopic fire-fighting foam foamer (700) according to any one of claims 1 to 9, the telescopic fire-fighting foam foamer (700) being mounted downstream of the fire-fighting foam foamer (100) and being connected in series to foam the fire-fighting foam delivered by the fire-fighting foam foamer (100) at least once.

11. The fire fighting foam foaming system of claim 10, wherein said fire fighting foam foaming device includes:

a two-phase flow injection seat (110) comprising a first flow path (111) and a second flow path (112) which are independent of each other;

The air nozzle assembly (120) comprises a liquid inlet hole (121), an air inlet hole (122), a first air outlet hole (123) and a flow guide part (124); the liquid inlet (121) is in fluid communication with the first flow path (111), and the liquid inlet (121) is located downstream of the first flow path (111); the inlet aperture (122) is in fluid communication with the second flow path (112) and is located downstream of the second flow path (112); and

a foam mixing chamber (130) located downstream of the first flow path (111) and the second flow path (112) and in fluid communication with the first flow path (111) and the second flow path (112); the first air outlet hole (123) and the flow guiding part (124) extend into the foam mixing chamber (130); the first air outlet holes (123) and the flow guide (124) are configured such that the air flow output via the air nozzle assembly (120) flows to different positions in the radial direction of the foam mixing chamber (130).

12. The fire fighting foam foaming system of claim 11, wherein said deflector (124) includes:

a second air outlet (124') is located at a different position from the first air outlet (123) in the radial direction of the foam mixing chamber (130).

13. The fire fighting foam foaming system according to claim 12, characterized in that said air nozzle assembly (120) comprises:

A mounting plate (125) attached to and fixed to the two-phase flow injection seat (110); the mounting plate (125) is provided with the air inlet hole (122) which is in fluid communication with the second flow path (112) of the two-phase flow injection seat (110);

an axial tube (126) mounted to a side of the mounting plate (125) remote from the two-phase flow injection seat (110); the axis of the axial tube (126) is parallel to the central axis of the two-phase flow injection seat (110); -said axial tube (126) being in fluid communication with said air inlet aperture (122) of said mounting plate (125); and

a radial tube (127), a central axis of the radial tube (127) intersects with a central axis of the axial tube (126), one end of the radial tube (127) is in fluid communication with the axial tube (126), and the other end of the radial tube (127) is located at one side of the axial tube (126) facing the central axis of the two-phase flow injection seat (110).

14. The fire fighting foam foaming system according to claim 13, characterized in that the number of said axial tubes (126) is plural, a plurality of said axial tubes (126) being distributed around the circumference of said mounting plate (125).

15. The fire fighting foam foaming system according to claim 13, characterized in that the other end of the axial tube (126) is remote from the two-phase flow injection seat (110); the other end of the axial tube (126) is used as the first air outlet hole (123) and is open; the other end of the axial tube (126) faces the inner wall of the foam mixing chamber (130).

16. The fire fighting foam foaming system according to claim 15, characterized in that the other end of the radial tube (127) is remote from the axial tube (126), the other end of the radial tube (127) being closed; the side wall of the radial pipe (127) close to the other end of the axial pipe (126) is provided with the second air outlet hole (124');

the axis direction of the second air outlet hole (124 ') is parallel to the central axis of the two-phase flow injection seat (110), or the axis direction of the second air outlet hole (124') intersects with the central axis of the two-phase flow injection seat (110), and the included angle is smaller than 90 degrees.

17. The fire fighting foam foaming system of claim 11, wherein said deflector (124) includes:

a deflector (124') positioned adjacent to the first outlet aperture (123); the deflector (124') is configured to deflect a portion of the airflow output via the first outlet aperture (123) to a position proximate a central axis of the foam mixing chamber (130).

18. The fire fighting foam foaming system according to claim 17, characterized in that said air nozzle assembly (120) further comprises:

a mounting plate (125) attached to and fixed to the two-phase flow injection seat (110); the mounting plate (125) is provided with the liquid inlet hole (121) which is in fluid communication with the first flow path (111) of the two-phase flow injection seat (110) and the air inlet hole (122) which is in fluid communication with the second flow path (112); and

An axial tube (126) mounted to a side of the mounting plate (125) remote from the two-phase flow injection seat (110); the axis of the axial tube (126) is parallel to the central axis of the two-phase flow injection seat (110); -said axial tube (126) being in fluid communication with said air inlet aperture (122) of said mounting plate (125);

wherein the deflector (124 ') is fixedly connected to the axial tube (126), the deflector (124') being configured to be non-porous; the baffle (124') is configured to form a negative pressure region on a side thereof remote from the mounting plate (125) such that a portion of the air flow output by the axial tube (126) flows to the negative pressure region.

19. The fire fighting foam foaming system according to claim 18, characterized in that said first flow path (111) is located on the central axis of said two-phase flow injection seat (110); the second flow path (112) is located outside the first flow path (111) along a radial direction of the two-phase flow injection seat (110).

20. The fire fighting foam foaming system of claim 11, further comprising:

-a first inlet pipe (140), the first flow path (111) being located downstream of the first inlet pipe (140) and in fluid communication with the first inlet pipe (140); and

A first outlet tube (150) is mounted downstream of the foam mixing chamber (130).

21. The fire fighting foam foaming system according to claim 11, characterized in that the inner wall of the foam mixing chamber (130) is configured to be conical; the flow area of the inlet of the foam mixing chamber (130) is larger than the flow area of the outlet of the foam mixing chamber (130).

22. The fire fighting foam foaming system of claim 20, further comprising:

a gas supply flow path (200) located upstream of the second flow path (112) of the two-phase flow injection seat (110) to supply gas to the two-phase flow injection seat (110);

a foam concentrate supply flow path (300) located upstream of the first flow path (111) of the two-phase-stream injection seat (110) to supply foam concentrate to the two-phase-stream injection seat (110); and

a water supply flow path (400) is also located upstream of the first flow path (111) of the two-phase flow injection seat (110) to provide water to the two-phase flow injection seat (110).

23. The fire fighting foam foaming system of claim 22, further comprising:

a water spray branch (500) arranged in parallel with the fire fighting foam foaming device (100); one end of the water spray branch (500) is in fluid communication with the water supply flow path (400); the other end of the water spraying branch (500) is connected with the first outlet pipe (150) in parallel; and

A foam-spraying branch (600) communicating with the water supply flow path (400); the foam-spraying branch (600) is positioned between the water supply flow path (400) and the first flow path (111) and is in fluid communication with the water supply flow path (400) and the first flow path (111);

wherein the water supply flow path (400) is selectively in fluid communication with at least one of the water spray branch (500), the foam spray branch (600).

24. The fire fighting foam foaming system of claim 10, further comprising:

-a delivery tube (810) in fluid communication with the fire fighting foam foamer (700), the delivery tube (810) being located downstream of the fire fighting foam foamer (700); and

and a revolving body (820) connected to the conveying pipe (810).

25. The fire fighting foam foaming system of claim 24, further comprising:

an ejector (830) is mounted downstream of the delivery tube (810).

26. The fire fighting foam foaming system according to claim 10, characterized in that the length of the pipe between the fire fighting foam foaming device (100) and the fire fighting foam foamer (700) is 10-20 times or more the maximum diameter of the pipe.

27. A fire fighting foam foaming method, characterized in that it is implemented by the fire fighting foam foaming system according to any one of claims 10 to 26, comprising the steps of:

When the foam extinguishing agent needs to be sprayed, the foam extinguishing agent is sprayed according to the set first flow velocity V _MI Foaming device for the fire-fighting foamA first inlet pipe (140) of the device (100) conveys the foam mixture;

according to the set second flow velocity V _G Delivering compressed gas to a second flow path (112) of a two-phase flow injection seat (110) of the fire fighting foam foaming device (100);

according to the set third flow velocity V _F1 And conveying the fluid output by the fire-fighting foam foaming device (100) to a telescopic fire-fighting foam foamer (700).

28. The fire fighting foam foaming method of claim 27, wherein said V _Ml 6-8 m/s; and/or, the V _G 8-15 m/s; and/or, the V _F1 5-10 m/s; and/or the number of the groups of groups,

the foam mixture injection apparent flow velocity at the inlet of the foam mixing chamber (130) of the fire-fighting foam foaming device (100) is V _1I ，V _1I 2m/s to 5m/s; and/or

The compressed gas injection at the inlet of the foam mixing chamber (130) of the fire-fighting foam foaming device (100) has an apparent flow velocity V _1G ，V _I1G 10-20 m/s; and/or

The apparent flow velocity of the foam flowing out at the outlet of the foam mixing chamber (130) of the fire-fighting foam foaming device (100) is V ₁₀ ，V ₁₀ 4m/s to 8m/s.

29. The fire fighting foam foaming method of claim 27, further comprising the steps of:

According to the set fourth flow velocity V _F2 Delivering fluid output by the telescoping fire fighting foam foamer (700) to an ejector (830).

30. The fire fighting foam foaming method of claim 29, wherein said V _F2 Is 6-12 m/s.