CN115364407A

CN115364407A - Telescopic fire-fighting foam foaming device, system and foaming method

Info

Publication number: CN115364407A
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: 2022-11-22
Anticipated expiration: 2042-08-31
Also published as: CN115364407B

Abstract

The invention discloses a telescopic fire-fighting foam foaming device, a telescopic fire-fighting foam foaming system and a telescopic fire-fighting foam foaming method, relates to the technical field of compressed gas foam fire extinguishing, and is used for improving the foaming effect of fire-fighting foam. The telescopic fire control foam generator includes: the device comprises a first pipe and a second pipe which are nested at least one stage, wherein one end of the second pipe is nested in the first pipe, and the other end of the second pipe is positioned outside the first pipe; a connection support installed at one end of the second pipe, the second pipe being slidably installed to the first pipe through the connection support; and a baffle plate mounted on the connection support portion. According to the technical scheme, after the delivered foam flows into the first pipe, under the action of the baffle, large foam formed in the delivery process of the foam is 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 the secondary foaming is automatically realized in the foam conveying process.

Description

Telescopic fire-fighting foam foaming device, system and foaming method

Technical Field

The invention relates to the technical field of compressed gas foam fire extinguishing, in particular to a telescopic fire-fighting foam foaming device, a telescopic fire-fighting foam foaming system and a telescopic fire-fighting foam foaming 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. Compressed gas foam systems are used to generate compressed gas foam to extinguish fires. 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 ultrahigh voltage convertor 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 surface surrounded by a liquid film, and can float on the surface of common combustible liquid to form a foam covering layer and adhere to the surface of common combustible solid due to small specific gravity and certain viscosity, so that the fire extinguishing agent is high in fire extinguishing efficiency, low in water consumption and recommended to be used in various fields and places such as petroleum, chemical engineering, storage, transformer substations and the like. The research on fire extinguishing technology in recent years has also proved that the compressed gas foam is obviously superior to the traditional common fire-fighting foam generated at the foam muzzle or through a foam generator by the negative pressure air suction principle in the aspects of foam liquid-separating time, stability, fire extinguishing and anti-reburning effects and the like.

The petrochemical engineering relates to a plurality of kinds and a large amount of inflammable and explosive substances, once a fire disaster occurs, the combustion speed is high, the fire development is rapid, a large-area three-dimensional fire disaster is easy to form, the reburning is easy to occur, and the difficulty in putting out the fire is very large. At present, the flow rate of a foam mixed liquid of a mature positive pressure type foam system is 20-100L/s, and once full liquid level combustion occurs in an oil tank or a flammable liquid storage tank with 5-10 ten thousand cubic meters in petrochemical enterprises, the flow rate of the foam mixed liquid of the positive pressure type foam system required by the storage tank for extinguishing fire is required to be more than 120-200L/s for supplying strength, so that the combustion liquid level can be quickly covered. To achieve this supply strength, current fixed systems in tank farms are implemented with multiple foam systems.

The inventor finds that at least the following problems exist in the prior art: the respective spraying devices are uniformly installed on the storage tank, so that the composition cost of the fire extinguishing system is increased and the foam can be reliably delivered and sprayed to the fire site. However, for compressed gas foam fire engines, compressed gas foam systems cannot supply a large flow of compressed foam, so it is difficult to achieve a longer range of fire monitor and a larger fire-fighting range. Therefore, the development of a large-flow compressed gas foam production device to meet the requirements of high efficiency and economy for fire suppression in large petrochemical industry is urgently needed.

Disclosure of Invention

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

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

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

a connection support installed at one end of the second pipe slidably installed to the first pipe through the connection support; and

and a baffle plate mounted on the connection 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 overflowing hole to the diameter of the second pipe is 1.05-1.1.

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

In some embodiments, an inner wall of the flowbore of the connection support is in smooth transition with an inner wall of the second tube.

In some embodiments, the number of the baffles is multiple, and the baffles are distributed along the circumferential direction of the overflowing hole.

In some embodiments, one end of each baffle is fixedly connected with the connecting support part, and the other end of each baffle is close to the central axis of the overflowing hole; the other ends of all the baffles are positioned on the same circumference, and the diameter of the circumference is 0.5 to 0.7 times of that of the second pipe.

In some embodiments, the other end of the baffle is spaced from the central axis of the flowbore by 0.25 to 0.35 times the diameter of the flowbore.

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

In some embodiments, the baffle is configured to be conical, and the cone angle β of the baffle is between 5 ° and 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, the compressed gas, into fire fighting foam; and

according to the telescopic fire-fighting foam foaming device provided by any technical scheme, the telescopic fire-fighting foam foaming device is installed at the downstream of the fire-fighting foam foaming device and is connected with the fire-fighting foam foaming device in series, so that fire-fighting foam conveyed by the fire-fighting foam foaming device is foamed at least once.

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

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

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 hole is in fluid communication with the first flow path and is located downstream of the first flow path; the inlet orifice is in fluid communication with the second flow path and is located downstream of the second flow path; and

a foam mixing chamber downstream of the first flow path, the second flow path, and in fluid communication with both the first flow path and the second flow path; the first air outlet and the flow guide part extend into the foam mixing chamber; the first air outlet hole and the flow guide portion are configured such that the air flow output via the air nozzle assembly flows to different positions in a 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 and fixed with the two-phase flow injection seat; the mounting plate is provided with the air inlet hole which is communicated with the second flow path of the two-phase flow injection seat in a fluid manner;

the axial pipe is arranged on one side of the mounting plate, which is far away from the two-phase flow injection seat; the axial line of the axial pipe is parallel to the central axis of the two-phase flow injection seat; the axial tube is in fluid communication with the air inlet of the mounting plate; and

the axial line of the radial pipe is intersected with the axial line 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 located on one side, facing the axial line of the two-phase flow injection seat, of the axial pipe.

In some embodiments, the number of the axial tubes is plural, and the plural axial tubes are arranged dispersedly around the circumference of the mounting plate.

In some embodiments, the other end of the axial tube is distal from the two-phase flow injection seat; the other end of the axial pipe is used as the first air outlet 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 distal to the axial tube, the other end of the radial tube being closed; the side wall of the radial pipe close to the other end of the axial pipe is provided with the second air outlet hole;

the axial direction of the second air outlet hole is parallel to the central axis of the two-phase flow injection seat, or the axial 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; the deflector is configured to deflect a portion of the air stream output via the first outlet aperture to a position proximate a central axis of the foam mixing chamber.

In some embodiments, the air nozzle assembly further comprises:

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

the axial pipe is arranged on one side of the mounting plate, which is far away from the two-phase flow injection seat; the axial line of the axial pipe is parallel to the central axis of the two-phase flow injection seat; the axial tube is in fluid communication with the air inlet of the mounting plate;

wherein the baffle is fixedly connected with the axial tube, the baffle being configured without holes; the baffle is configured to create a negative pressure region on a side of the baffle itself 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 tube, the first flow path being downstream of the first inlet tube and in fluid communication with the first inlet tube; and

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

In some embodiments, the inner wall of the foam mixing chamber is 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 raw liquid supply flow path located upstream of the first flow path of the two-phase flow injection seat to supply a foam raw liquid to the two-phase flow injection seat; and

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

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

the water spraying branch 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 positioned between the water supply flow path and the first flow path and is communicated with the water supply flow path and the first flow path in a fluid mode;

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

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

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

and the revolving body is connected with the conveying pipe.

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

an ejector mounted downstream of the delivery tube.

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

The embodiment of the invention provides a fire-fighting foam foaming method, which is realized by adopting a 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 first flow rate V is set _MI Delivering a foam mixed liquor 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 a 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, the V _G 8-15 m/s; and/or, the V _F1 5-10 m/s; and/or the presence of a gas in the gas,

the flow velocity of foam mixed liquid injected into the inlet of the foam mixing chamber of the fire-fighting foam foaming device is V _1I ，V _1I Is 2m/s to 5m/s; and/or

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

The flow velocity of the foam outflow appearance at the outlet of the foam mixing chamber of the fire-fighting foam foaming device is V ₁₀ ，V ₁₀ Is 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 foaming device to a sprayer.

In some embodiments, theV _F2 Is 6 to 12m/s.

The telescopic fire-fighting foam foaming device provided by the technical scheme is particularly suitable for a large-flow compressed gas foam system, and can carry out secondary foaming on foams conveyed by other foaming devices. In the process of delivering the high-flow compressed gas foam, because the flow of the fire-fighting pipeline is large, on one hand, the foam mixed liquid which is foamed only once may be incompletely foamed; on the other hand, the phenomena that the foam is easy to break, the gas overflows from the bubble flow and is integrated into large bubbles and the like exist because the change of direction or the change of diameter is more in pipeline conveying. The telescopic fire-fighting foam foaming device is a part of a conveying pipeline and comprises a connecting support part, a baffle plate, a first pipe and a second pipe, wherein the first pipe and the second pipe are nested at least at one stage, and after the conveyed foam flows into the first pipe, the large foam can be crushed again under the action of the baffle plate to form uniform small foam, so that the foaming effect is improved, and the fire extinguishing performance of the foam is improved; and the secondary foaming is automatically realized in the foam conveying process.

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 embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:

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

FIG. 3 isbase:Sub>A schematic sectional view A-A of FIG. 2.

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

Fig. 5 is a schematic structural diagram of an air nozzle assembly of a fire fighting foam foaming device of a fire fighting foam foaming system according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a fire fighting foam generating device of a fire fighting foam generating system according to another embodiment of the present invention.

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

Fig. 8 is a schematic cross-sectional view of fig. 6 taken at N-N.

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

Fig. 10 is a schematic structural view of a telescopic fire fighting foam generator of the fire fighting foam generating system according to the embodiment of the present invention.

Fig. 11 is a partially enlarged view of one end of fig. 10.

Fig. 12 is a schematic view of fig. 11 taken along direction M.

Fig. 13 is a schematic view of fig. 11 in the direction of N.

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

Reference numerals:

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

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

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

121. a liquid inlet hole; 122. an air intake; 123. a first air outlet hole; 124' and a second air outlet; 125. mounting a plate; 126. an axial tube; 127. a radial tube; 124. a flow guide 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 stock solution suction branch; 300b, a flushing branch; 301. a foam pipette valve; 302. Flushing the water inlet valve; 303. a foam pump; 304. a check valve; 305. a foam flow meter; 306. A foam concentrate 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. connecting the supporting part; 706. a baffle plate; 706', a baffle; 706', a baffle; 705a, an overflowing hole; 71. an outer tube; 72. an intermediate pipe; 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. a second flange.

Detailed Description

The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 14.

The inventor finds that in the fire fighting industry, the existing mature and reliable foam mixing device of a medium and small-sized compressed gas foam system (the foam mixed liquid flow is 20-100L/s) adopts a static mixer or a plurality of static mixers which are connected in series/in parallel to form a group which is connected in a pipeline, and has the advantages of simple structure, reliable performance and no need of additional driving force. These static mixers can be divided in principle into two main categories, one being based on designing different fluid mixing and injection structures, such as: (1) dividing any one of the gas phase flow or the liquid phase flow into a plurality of finer flow bundles to be injected into the outer interface of the other phase flow for mixing, (2) dividing any one of the gas phase flow or the liquid phase flow into a plurality of finer flow bundles to be injected into the inner part of the other phase flow for mixing, and the like; the other type starts from designing different spoiler structures, such as superposed mesh plates, spiral deflectors, three-dimensional grid plates, conical spoilers and the like. The designs are finally designed to ensure that the gas phase flow is better dispersed by the liquid phase flow, and the two-phase flow can be more uniformly mixed under the impact action of the turbulence piece to form a bubble flow with fine particles and uniform foam distribution. Of course, in order to enhance the foaming effect of the two types of static mixers, some designs design that a reducing structure of a venturi tube or a Laval tube is designed in the front pipeline and the rear pipeline which are connected with the static mixers on the basis of the foaming effect, so that the effect of mutual impact mixing of two-phase flows is further enhanced.

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

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

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

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

After further research, the inventor finds that under the condition that the chemical components of the foam stock solution and the physical properties of the foam stock solution, water and gas are determined, two links mainly exist for actually influencing the preparation quality of the fire extinguishing foam in a large-flow compressed gas foam system: namely, one is the mixing and foaming effect of the foam mixing chamber, and the other is the development change in pipeline transportation after foaming.

Therefore, the inventor provides a fire-fighting foam foaming device suitable for a large-flow compressed gas foam system, which can be successfully applied to a vehicle-mounted or fixed system and realize better fire extinguishing efficiency. This fire control foam foaming device has reached the obvious effect in three aspects, promptly: firstly, the high-flow two-phase flow mixed foam is more uniform and fine; secondly, the pressure loss of the pipeline is reduced, and the compressed gas foam can obtain a longer jet distance; thirdly, the structure is simple and reliable, and the occupied space is small.

The terms or expressions used herein are to be interpreted.

The fire-fighting foam is a bubble group which has small volume and is surrounded by a liquid film on the surface and is used for fire fighting. Because the specific gravity is far less than that of the general combustible liquid, the liquid can float on the surface of the liquid to form a foam covering layer. Meanwhile, the fire-fighting foam has certain viscosity and can adhere to the surface of a common combustible solid.

The preparation method of the fire-fighting foam comprises the following steps: the foam stock solution and water are uniformly mixed according to a certain proportion, and then the foam mixed solution is mixed with gas for foaming, so that the fire extinguishing agent with fire extinguishing effect, namely the fire-fighting foam, is finally formed.

The foam 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 foam mixed solution proportion, the gas-liquid ratio, the mixing pressure, the gas-liquid mixing uniformity, the gas-liquid two-phase surface contact area and other factors.

Foam stock solution: can be mixed with water in a proper mixing ratio to form a concentrated liquid of the foaming solution.

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

Expansion ratio: the ratio of the volume of foam to the volume of foam mixture that forms the foam. Low multiple foam: fire extinguishing foam with expansion ratio lower than 20. Wet foam: foams with a foaming ratio lower than 10 times. Dry foaming: a foam having a foaming ratio 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 sprays foam to extinguish fire through a compressed gas foam system.

Foam proportion mixing system: the system consists of a foam proportion mixer, a foam stock pump, a control device, a pipeline device and the like, and can mix water and foam stock solution according to a certain proportion.

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

The terms and dimensions are used herein for descriptive purposes.

D1 is the diameter of the first channel 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 primary outlet tube 150, which is also the outlet diameter of the foam mixing chamber 130.

D4 is the diameter of the circumferential surface on which the other ends of all the radial tubes 127 are located.

d3 is the diameter of the circumferential surface on which the other end of all of the baffles 702 is 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 by 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 inlet 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 liquid inlet hole 121 is in fluid communication with the first flow path 111, and the liquid inlet hole 121 is located downstream of the first flow path 111. The intake aperture 122 is in fluid communication with the second flow path 112 and is 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 both the first flow path 111 and the second flow path 112; the first air outlet hole 123 and the second air outlet hole 124' both extend into the foam mixing chamber 130; the first and second 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 mixed liquid and compressed gas. The foam mixture enters the two-phase flow injection seat 110 and then flows directly along the first flow path 111 to the foam mixing chamber 130. After entering the two-phase flow injection seat 110, the compressed gas 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 to interact with the foam mixture entering the foam mixing chamber 130 to generate fire fighting foam.

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

The specific implementation of the various components of the fire fighting foam foaming device 100 will be described in detail below with respect to the flow path of the fluid into the fire fighting foam foaming device 100.

As introduced above, the fluid entering the fire fighting foam foaming device 100 is classified into two categories: foam mixed liquid and compressed gas. The foam mixed liquid is a mixture of foam stock liquid and water. 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 arrow S1, see fig. 2. The compressed gas then flows from the external conduit of the firefighting foam foaming apparatus 100 along the second flow path 112 into the two-phase flow injection seat 110, and the fluid that enters the second flow path 112 flows along the dashed arrow S2, see fig. 2.

Specifically, referring to fig. 2, the foam mixture is delivered into the first inlet pipe 140, and then enters the first flow path 111 of the two-phase flow injection seat 110 along the first inlet pipe 140. The central axis of the first inlet tube 140 coincides with the central axis of the two-phase flow 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 hole 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 hole 121 is slightly larger than the flow area of the first inlet pipe 140 and the flow area of the first flow path 111 of the two-phase flow inlet block 110. Here, the first inlet pipe 140 and the first flow path 111 are both cylindrical structures, for example. The foam mixture then flows out of the inlet opening 121 of the air nozzle assembly 120 and then into the foam mixing chamber 130 to be mixed with the compressed gas output from the second flow path 112 of the two-phase flow injection seat 110 to be foamed into foam.

With continued reference to FIG. 2, the compressed gas enters the second flow path 112 of the two-phase flow injection block 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 air nozzle assembly 120 is divided into two streams, one stream exiting the air nozzle assembly 120 through the first exit aperture 123, i.e., stream S21; the other stream exits the air nozzle assembly 120 at a second exit aperture 124', i.e., stream S22. 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 a central axis of the two-phase flow injection seat 110; the first flow path 111 is specifically an air inlet hole 122 penetrating the two-phase flow injection seat 110 in the axial direction thereof. The second flow path 112 includes two sections, a first section being a gas hole extending along the radial direction of the two-phase flow injection seat 110, and a second section being an annular groove having an axis parallel to the axial direction of the two-phase flow injection seat 110, the annular groove being in fluid communication with the gas hole of the first section. 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. With this structure, the two-phase flow injection seat 110 allows the first flow path 111 and the second flow path 112 to be independent and not to be connected in series or in series, and allows the first flow path 111 and the second flow path 112 to have a certain overlap region 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, the structure occupied by the two-phase flow injection seat 110 is small in size, and the structure is compact and reasonable.

The air nozzle assembly 120 is fixedly coupled to the two-phase flow injection seat 110. The air inlet 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 discharged through the first and second outlet holes 123 and 124'. The first outlet hole 123 and the second outlet hole 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 outlet port 123 is closer to the radial edge of the bubble mixing chamber 130 and the second outlet port 124' is closer to the central axis of the bubble mixing chamber 130.

Air nozzle component 120 adopts above-mentioned structure, has realized cleverly that compressed gas has carried out the intensive mixing from the surface and the inside of foam mixture liquid column, has enlarged the area of contact of compressed air and foam, water, and first venthole 123, first venthole 123 all are located the inside of foam mixing chamber 130 in addition, have effectively reduced because air nozzle component 120 occupies the position the excessive pressure loss that causes.

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 the thickness of the plate is preferably as thin as possible to meet the requirements of fixed mounting, so that the entire fire fighting foam foaming device 100 is more compact and delicate in structure. The mounting plate 125 is attached to and secured to the two-phase flow injection seat 110, such as by bolting, welding, riveting, or the like. The mounting plate 125 defines an inlet aperture 122 in fluid communication with the second flow path 112 of the two-phase fluid injection socket 110 and an inlet aperture 121 in fluid communication with the first flow path 111. The axial tube 126 is mounted to the mounting plate 125 on a side thereof remote from the two-phase flow injection seat 110, and the axial tube 126 and the mounting plate 125 are welded to each other. The axis of the radial tube 127 is perpendicular to the central axis of the two-phase flow injection seat 110. The axial tube 126 is in fluid communication with the air intake aperture 122 of the mounting plate 125. The compressed gas enters the axial tube 126 along the inlet holes 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 at a position near the downstream end of the axial tube 126. This configuration allows radial tube 127 to be axially spaced from the inlet of foam mixing chamber 130 so that the foam mixture interacts with the compressed gas output from 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.

Above-mentioned technical scheme, the compressed gas of axial pipe 126 output and the liquid column that the foam mixed liquid formed are located the regional part interact of circumference surface, and the compressed gas of radial pipe 127 output can stretch into the central point that the foam mixed liquid put to the liquid column that forms with the foam mixed liquid is located the regional part interact of center, like this greatly increased the area of contact of compressed gas and foam mixed liquid, improved the foaming effect. Also, the arrangement of the axial tubes 126 and radial tubes 127 reduces the resistance to liquid flow impingement.

With continued reference to fig. 2, in some embodiments, the other end of the radial tube 127 is distal 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 a second air outlet 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 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 axial tube 126 is distal from two-phase flow injection seat 110, and the other end of axial tube 126 is open as 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 tapered inner wall of the foam mixing chamber 130.

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

Referring to fig. 3 and 4, in some embodiments, the number of the radial tubes 127 is multiple, specifically, 8 to 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 outlet holes 124'. The first outlet holes 123 have a relatively large flow area, and each of the second outlet holes 124' is a micro-hole. In some embodiments, the flow area of the other end of the axial tube 126 is 1.5 to 2 times the flow area of all of the second outlet apertures 124' of the radial tubes 127 that are in fluid communication with the axial tube 126. The distance H1 (see FIG. 2) from the top end of the stem inserted into the middle of the foam mixing chamber 130 to the axis of the foam mixing chamber 130 is 0.15-0.2 times of the inflow path D1 (see FIG. 2) of the foam mixture of the two-phase flow injection seat 110, so that the air flow output by the radial tube 127 can fully interact with the interior of the foam mixture.

With continued reference to fig. 3 and 4, in some embodiments, the other ends of all the radial tubes 127 are located on the same circumferential surface, and the diameter D4 of the circumferential surface is 0.3 to 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 D1. The diameter of the first outlet tube 150 is 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 overflowing pressure loss is reduced, the filling resistance of the compressed gas is reduced, and the path of gas-liquid two-phase opposite-impact stirring is optimized, so that the foaming effects of more uniform mixing and smaller foam granularity are realized.

Moreover, 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 shaft hole design, so as to ensure that the minimum flow area of the foam mixing chamber 130 is not less than the inflow area of the foam mixture of the two-phase flow injection seat 110. This fire control foam foaming device 100 has realized that compressed gas carries out intensive mixing from the surface and the inside of foam mixture liquid column, has enlarged the area of contact of two-phase flow, has effectively reduced moreover because the air nozzle occupies the excessive flow pressure loss that causes. The air nozzle assembly 120 is designed by a reasonable number of nozzle holes and a reasonable structural size, so 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.

With continued reference to fig. 2, the inner walls of the foam mixing chamber 130 are tapered; 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, i.e. D2 is larger than D3.

Foam mixing chamber 130 adopts the design of awl cylindricality, variable cross section, realized on the one hand that foam mixed liquid can form the relative low-pressure region near conical surface department when foam mixing chamber 130 flows through, be favorable to first venthole 123 and second venthole 124' to pour into the mixture into, on the other hand most compressed gas through the first venthole 123 that is on a parallel with the conveying line axis with the conical surface, liquid phase near the conical surface strikes each other to and stir and strike each other with the liquid phase after the conical surface reflection again, thereby realize mixing more evenly, the foaming effect that the foam particle size is littleer.

In some embodiments, the foam mixing chamber 130 has an axial length 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 from the central axis of the foam mixing chamber 130 by an angle θ, which is 40 ° to 50 °.

As described above, the foam mixing chamber 130 is internally configured as a tapered cylindrical cross-sectional hole, the foam outflow taper diameter D3 of the foam mixing chamber 130 is the same as the foam mixture inflow diameter D1 of the two-phase flow inlet 110, and the cylindrical opening diameter D2 of the foam mixing chamber 130 is 1.5 times the taper diameter D3. That is, the inlet diameter D2 of the bubble mixing chamber 130 is 1.3 to 1.7 times, specifically, 1.5 times, the outlet diameter D3 of the bubble 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 to 0.6 times, specifically, 0.4 times, 0.5 times, 0.6 times the outlet diameter D3 of the foam mixing chamber 130. By adopting the proportion parameters, the foaming time is in a better range, and the foaming effect is greatly improved.

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

Referring to fig. 6-10, further embodiments are described below.

The present embodiment is different from the above embodiments in the implementation manner of the flow guide part 124. The flow guiding portion 124 particularly comprises a flow guiding plate 124", the flow guiding plate 124" being located adjacent to said first outlet aperture 123. The deflector 124 "is configured to deflect a portion of the air stream output through the first outlet aperture 123 to a position near the central axis of the foam mixing chamber 130.

In each of the above embodiments, the flow guide 124 employs the second outlet hole 124'. Since the second air outlet 124 'and the first air outlet 123 are located at different positions in the radial direction of the foam mixing chamber 130, the air flow coming out of the second air outlet 124' is closer to the central axis area of the foam mixed liquid column, and the air flow coming out of the first air outlet 123 is closer to the circumferential surface area of the foam mixed liquid column.

However, in the present embodiment, the air flow is entirely output to the bubble mixing chamber 130 via the first outlet hole 123. The surface of the deflector 124 "blocks the foam mixture entering the foam mixing chamber 130, so that downstream in the direction of flow of the foam mixture, i.e. on the side of the deflector 124" facing away from the mounting plate 125, a negative pressure area a is created which results in 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 region 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 compressed air acting on both the central axis region and the circumferential surface region of the foam mixture liquid column entering the foam mixing chamber 130 is provided.

Referring to fig. 10, the baffle 124 "is trapezoidal in shape when viewed from the direction P, and the baffle 124" is thicker at one end and thinner at the other end in connection with the axial tube 126. L5 is 15-30mm, and L6 is 5-8 mm. The taper angle of the guide plate 124' is delta, delta is 15 degrees to 25 degrees, specifically 15 degrees, 18 degrees, 20 degrees, 22 degrees, 25 degrees 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, so that the fluid flow in the first flow path 111 can be used to form a low pressure area at the conical cavity annular wall space for the compressed gas to enter; and the side of the deflector 124 "remote from the mounting plate 125 also forms a low pressure zone a.

According to the technical scheme, after liquid flow passes through the air nozzle assembly 120, the low-pressure area A formed on the back surface of the air nozzle assembly 120 is skillfully utilized to guide compressed gas to be reflected by the inner conical surface of the foam mixing chamber 130 and enter 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 a foam mixed liquid column, the contact area of two-phase flow is enlarged, and the overflowing pressure loss caused by the space occupied by the air nozzle assembly 120 is effectively reduced.

Referring to fig. 1, another embodiment of the present invention further provides 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 foam raw liquid supply flow path 300 is located upstream of the first inlet pipe 140 to supply the foam raw 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, principle and specific implementation of the fire fighting foam foaming system will be described in detail below along the flow direction of each fluid.

First, a part 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, the gas supply circuit 200 includes an air compressor 201, a gas distribution valve 202, and a cooler 203. The various components are in fluid communication with one another via conduits. The air compressor 201 is configured to provide compressed air. An intake throttle valve 209 may also be provided upstream of the air compressor 201 to adjust the amount of intake air. Upstream of the intake throttle valve 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 air output by the air compressor 201.

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

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 by the air compressor 201 to supply the compressed gas to the fire fighting foam foaming device 100 according to the set flow parameters. 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 by the gas distribution valve 202 so that the compressed gas enters the second flow path 112 of the fire fighting foam expansion device 100 according to the set temperature requirement.

In order to accurately 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 rate of the compressed gas in the pipeline is collected by the 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 airflow meter 206 and the second flow path 112 such that compressed gas can only flow from the airflow meter 206 to the second flow path 112 without flowing back. Moreover, the possibility of the first flow path liquid flowing back to the gas path in the foam-foaming device 100 in some cases is eliminated.

In some embodiments, the fire fighting foam foaming system further comprises a controller 850, and the controller 850 is in communication with the air compressor 201, the air intake throttle valve 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 inlet throttle valve 209 and the gas distribution valve 202 according to the state parameters collected by the water flow meter 406, the second pressure gauge 602, the second switching valve 601, the foam mixture switching valve 840, the first pressure gauge 208 and the air flow meter 206 to meet the fire extinguishing requirement, 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 requirement. Parameters such as flow, expression flow rate also called flow rate, etc.

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

In some embodiments, foam concentrate supply flow path 300 includes foam aspirate valve 301, flush inlet valve 302, and foam pump 303. The various components are in fluid communication with one another via conduits.

Referring to fig. 1, a foam pump 303 is used to pump the foam. Upstream of the foam pump 303, two branches are provided: a foam stock solution suction branch 300a and a flushing branch 300b. The foam raw liquid suction branch 300a supplies foam raw liquid 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 raw liquid supply path 300.

Referring to fig. 1, a foam pipette valve 301 is located in the foam concentrate intake branch 300a, and the foam pipette valve 301 is configured to communicate with a foam concentrate port 306.

A flush fill valve 302 is located in the flush branch 300b, the flush fill valve 302 being configured to communicate with a flush water interface. 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 is in a conducting state, and fluid can flow through the valve in the conducting state.

In order 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. Check valve 304 is used to allow unidirectional flow of foam in the tubing of foam pump 303, placing a backflow.

In order to accurately detect the flow rate of the foam raw liquid pumped by the foam pump 303, in some embodiments, the foam raw liquid supply flow path 300 includes a foam flow meter 305. The foam flow meter 305 is used to detect the foam flow in the pipeline.

In some embodiments, foam aspirate valve 301, flush inlet valve 302, foam pump 303, foam flow meter 305, foam mix on-off valve 840 are all communicatively coupled to controller 850. The controller 850 is configured to control the respective operation 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 mixture switching valve 840, the foam flow meter 305, the check valve 304, and the specific requirement of fire extinguishing.

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

Referring to fig. 1, in some embodiments, the fire fighting foam foaming system further comprises a water supply flow path 400. The water supply path 400 includes a filter 401, a water pump 402, a vacuum pump 403, and a check valve 404, and fluid communication is performed between components requiring fluid communication through pipes. A water pump 402 is installed downstream of the filter 401; the vacuum pump 403 is communicated with a pipeline between the filter 401 and the water pump 402 to pump gas in the pipeline; a check valve 404 is installed downstream of the water pump 402.

The water supplied from the water supply line 400 may be used to produce foam mixture and fire foam, or may be used directly to extinguish a fire. To accomplish the above switching, referring to fig. 1, in some embodiments, the fire fighting foam foaming system further includes a water spraying branch 500 and a foam spraying branch 600.

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

If foam is required as the fire extinguishing agent, the water spraying branch 500 is disconnected and the foam spraying branch 600 is in a conducting state. At this time, the water supplied from the water supply path 400 is mixed with the foam raw liquid supplied from the foam raw liquid supply path 300 along the foam spraying branch 600, and then enters the first flow path 111 of the two-phase flow injection seat 110, and is acted together with the compressed gas supplied from the gas supply path 200, so as to obtain the fire fighting foam.

Specifically, the water spraying branch 500 is arranged in parallel with the foam spraying 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 injection branch 600 communicates with the water supply flow path 400; the foam injection branch 600 is located between the water supply flow path 400 and the first flow path 111. The spray foam leg 600 is in fluid communication with both 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 and 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 in the water spray branch 500; the second switching valve 601 is installed at the foam spraying 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 open state and the water spray branch 500 does not allow water to pass through. 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 off state, and the foam spraying branch 600 does not allow water to pass through.

An external or fire-fighting vehicle enters the water supply flow path 400 through the water inlet pipe port 407, passes through the filter 401, and is pumped by the water pump 402 to flow downstream. A vacuum pump 403 and a vacuum gauge 405 are installed on the pipe between the water pump 402 and the filter 401 to evacuate the inside of the pipe when necessary. After passing through the water pump 402, the water passes through the check valve 404, the water flow meter 406, and then the flow direction is switchably selected to the water spraying branch 500 and the foam spraying branch 600. When pressurized water supply is used, the vacuum pump 403 need not operate; when pumping a low water source, the vacuum pump 403 is used to pump a vacuum between the water pump 402 and the water intake pipe to effect the suction.

The first option is: when water flows to the foam injection branch 600, the second switching valve 601 is in the on state, the first switching valve 501 is in the off state, and all the water delivered 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 injection switching valve, and is initially mixed with the foam raw liquid delivered to the first flow path 111 of the two-phase flow injection seat 110 by the foam raw liquid supply flow path 300, thereby forming a foam mixed liquid. In order to control whether or not foaming is necessary more easily, a foam mixture switching valve 840 is provided at the inlet of the first flow path 111 of the two-phase flow inlet block 110, and the foam concentrate supply flow path 300 and the water supply flow path 400 are both located upstream of the foam mixture switching valve 840. The foam raw liquid supplied from the foam raw liquid supply passage 300 and the water supplied from the water supply passage 400 are merged at the foam liquid mixture switching valve 840. Foam mix on-off valve 840 is also communicatively coupled to controller 850 as described above, and controller 850 controls the parameters of the opening, closing, and opening of 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, and the second pressure gauge 602 detects the water pressure in the pipeline so that the water is mixed with the foam raw liquid at a set pressure. The second pressure gauge 602 is in communication connection with the controller 850 described above, the parameter detected by the second pressure gauge 602 is sent to the controller 850, and the controller 850 controls the operating states of the water pump 402, the vacuum pump 403 and the foam spraying switch valve according to the parameter detected by the second pressure gauge 602.

And a second option: the water pumped by the water pump 402 does not flow through the fire fighting foam foaming device 100, but flows directly downstream of the fire fighting foam foaming device 100. At this time, the second switching valve 601 is off, and water cannot flow through the second switching valve 601. The first switching valve 501 is turned on, and water flows into the water spray branch 500 through the first switching valve 501, and finally flows to the foam sprayer 830 described later to be sprayed for fire extinguishing. 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 a chassis of the fire truck, the water and the foam stock solution come from a water tank and a foam tank loaded on the chassis, and the controller 850 calls a corresponding control program according to signals collected by various sensors and control instructions of an operator and different operation requirements of water spraying, wet foam spraying and dry foam spraying according to the requirements of a fire extinguishing site, accurately prepares a mixed composition of the water, the foam stock solution and compressed gas, and realizes water or foam spraying fire extinguishing with certain pressure and flow.

For a large-flow compressed air foam system, because the flow of a fire-fighting pipeline is large, some large air masses which are not fully foamed may still exist after compressed gas is processed by the fire-fighting foam foaming device 100, and in addition, because the direction change or the diameter change in pipeline conveying is more, the formed composite fluid of foam (a large amount), foam mixed liquid (a small amount) and compressed gas (a small amount) can also overflow from the bubble flow to be integrated into large bubbles through the pipeline. In order to improve the fire extinguishing effect, the stream of bubbles delivered through the fire fighting foam foaming device 100 will be delivered to the fire fighting foam foamer 700 for re-fine division and mixed foaming. Referring to fig. 1, a fire fighting foam generator 700 is located downstream of the fire fighting foam generating device 100 and the water spray branch 500. The fire fighting foam generator 700 plays a role of secondary foaming to improve the performance of the generated foam, so that the fire fighting requirement is more satisfied, and a better fire fighting effect is achieved.

Referring to fig. 10 to 13, an implementation of a telescopic fire fighting foam foamer 700 provided by some embodiments of the present invention will be described.

Preferably, the telescopic fire fighting foam foamer 700 is adapted to cooperate with other foaming devices to foam the foam generated by the other foaming devices once or even more during the delivery process. The number of foaming times is positively correlated with the number of stages of the multi-stage telescopic pipes included in the telescopic fire-fighting foam foaming device 700.

Specifically, telescopic fire fighting foam foamer 700 includes a multi-stage telescopic tube. Specifically, the telescoping fire fighting foam foamer includes a connecting support 705, a baffle 706, and at least one level of nested first tube 703 and second tube 704. 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 705 is installed at one end of the second pipe 704, and the second pipe 704 is slidably installed to the first pipe 703 through the connection support 705. The baffle 706 is attached to the connection support 705.

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

In relation to the total number of segments of the pipe, the larger the number of the first pipe 703 and the second pipe 704 to be nested, the larger the number of stages. Taking two stages as an example, the telescopic fire fighting foam foamer 700 comprises three tubes, which are respectively marked as: an outer tube 71, an intermediate tube 72, and an inner tube 73. The intermediate tube 72 nests inside the outer tube 71 forming a first level of nesting. The inner tube 73 nests inside the middle tube 72 forming a second level of nesting. For each stage of nesting, located on the outside is a first tube 703 and located on the inside is a second tube 704.

The above description is for the example of two level nesting, which in the case of three level nesting includes four tubes, in the same manner as described above.

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

A first flange 711 is attached to the tail end of the outer pipe 71, and a first set of outer pipes 712 is attached to the head end of the outer pipe 71.

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

A second piston 731 serving as the connection support 705 is attached to the rear end of the inner tube 73, and a second flange 732 is attached to the head end of the inner tube 73.

Baffles 706 are also mounted at the rear of both the middle tube 72 and the inner tube 73. For ease of distinction, the baffle at the rear of the middle tube 72 is denoted 706 ', and the baffle at the rear of the inner tube 73 is denoted 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= 1.14-1.16, d2: d3= 1.14-1.16.

The first and

second pistons

721, 731 each comprise a flat section and a convex section, the diameter of the flat section of the first piston 721 is designated as d21, and the diameter of the flat section of the second piston 731 is designated as d31. The flat sections of the first piston 721 have lengths designated L21 and L31, respectively. L21= (0.3 to 0.5) × d21, L31= (0.3 to 0.5) × d31.

The baffle 706 'installed in the first piston 721 has a width L22, and the baffle 706' has a length L23 along the axial direction of the first piston 721. L22=15 to 30mm, L23=15 to 20mm.

The stopper 706 'installed in the second piston 731 has a width L32 and a length L33 of the stopper 706' in the axial direction of the second piston 731. L32= 15-30mm, L33= 15-20 mm.

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

Referring to fig. 7 to 9, the number of the baffles 706 is plural, and specifically, for example, 10 to 15 baffles 706 are correspondingly installed on each second pipe 704. A plurality of baffles 706 are arranged dispersed along the circumference of the overflowing hole 705 a.

Referring to fig. 7 to 9, one end of each baffle 706 is fixedly connected to the connection support 705, and the other end of each baffle 706 is close to the central axis of the overflowing hole 705a; the other ends of all the 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. Namely d22= (0.5 to 0.7) × d2, d32= (0.5 to 0.7) × d3. The flow area after passing through the baffle 706 is 0.85 to 1 times larger than that of the inlet of the first pipe 703.

Referring to fig. 10 and 11, the baffle 706 extends in a radial direction of the second pipe 704, and a maximum extension plane of the baffle 706 is parallel to a cross section of the second pipe 704. The baffle 706 is constructed 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 gas-liquid two-phase flow can be promoted to be uniformly dispersed again in the foam conveying process, and on one hand, the impact pressure loss during foam overflowing is reduced; on the other hand, the foam extinguishing agent can better crush and operate at the position of the ring pipe wall again, large bubbles which possibly overflow due to the conditions of liquid throttling, plug flow and the like exist, and a plurality of turbulent vortices which are distributed from the ring pipe wall to the center of the pipeline can be formed behind the tooth-shaped baffle plate, so that the gas-liquid two-phase flow is promoted to be uniformly dispersed again, and finally, finer and more uniform high-quality foam is formed, and the fire extinguishing effect is improved.

By adopting the implementation mode, the telescopic fire-fighting foam foaming device 700 reduces the pressure loss of the mixed through flow and realizes that the foam can be promoted to foam again in the conveying process; the telescopic fire-fighting foam foaming device 700 is compact in structure and small in occupied space, and each baffle 706 is in a tapered design along the radial direction of the second pipe 704, so that impact pressure loss during foam overflowing is reduced; on the other hand, the large bubbles overflowing due to the liquid throttling, plug flow and the like can be crushed again, and a plurality of turbulent eddies distributed from the ring pipe wall to the center of the pipeline can be formed at the rear side, namely the downstream side, of the baffle 706, so that the gas-liquid two-phase flow is promoted to be uniformly dispersed again, and finally, finer and more uniform high-quality foam is formed, and the fire extinguishing effect is improved.

The technical scheme is suitable for a scene needing large-flow compressed air foam, the fire-fighting foam foaming system comprises a fire-fighting foam foaming device 100 and a 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, first-stage foaming is realized, the telescopic fire-fighting foam foaming device 700 realizes second-stage and third-stage multi-stage foaming, and after the telescopic fire-fighting foam foaming device 700 processes the first-stage telescopic fire-fighting foam foaming device 700, large air mass still existing and not fully dispersed in the foam mixed liquid and large integrated bubbles overflowing from the air bubble flow due to direction change or diameter change of a certain conveying distance are subjected to secondary segmentation and mixed foaming. The test and verification of the foam mixed liquid with the flow rate of 100-200L/s show that the technical scheme has satisfactory foaming effect within the foaming multiple of 3-15.

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

The foam generated by 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 comprises a sprayer 830, such as a fire monitor in particular, sprayer 830. The 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 extinguishing fire. Foam appearance speed V of conveying pipeline between fire-fighting foam foaming device 700 and ejector 830 _F2 6 m/s-12 m/s, so that the sprayer 830 can spray uniform fire-fighting foam with good quality。

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

In order to reduce the pressure loss of the pipeline and improve the foaming quality and form uniform bubble flow, the fire-fighting foam foaming system adopts the following parameters: the foam mixed liquid conveying pipeline represents a first flow velocity V _Ml Is 6 to 8m/s. The compressed gas conveying pipeline represents a second flow velocity V _G 8-15 m/s; third speed V of the foam representation of the conveying line between the fire fighting foam foaming device 100 and the telescopic fire fighting foam foamer 700 _F1 Is 5 to 10m/s. The entry aspect speed of the fire fighting foam maker 700 is the same as the exit aspect speed thereof, and is V _F1 And is 5 to 10m/s. Apparent fourth velocity V of pipeline-conveyed foam between fire fighting foam foamer 700 and eductor 830 _F2 Is 6 to 12m/s.

Above-mentioned technical scheme is adapted to large-traffic compressed air foam system, and the foaming quality is high, and pipeline pressure loss is little, and foaming device compact structure is exquisite, the space occupy little to and use maintenance convenience.

Referring to fig. 13, an embodiment of the present invention provides a fire fighting foam foaming method, which is implemented by using a fire fighting foam foaming system provided in any technical solution of the present invention, and the contents not described in this embodiment refer to the contents of the above embodiments. The fire-fighting foam foaming method comprises the following steps:

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

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

In some embodiments, the fire fighting foam foaming method further comprises the following step S300: according to a set third flow velocity V _F1 The fluid output from the fire fighting foam foaming device 100 is delivered to the fire fighting foam foamer 700. The foam appearance speed of the conveying pipeline between the two stages of foaming devices is a 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 by fire fighting foam foamer 700 is delivered to eductor 830. In some embodiments, V _F2 Is 6 to 12m/s.

According to the technical scheme, proper foaming parameters are adopted, so that the pressure loss of a pipeline can be effectively reduced, the foaming quality is improved, an even bubble flow is formed, and the device is particularly suitable for a large-flow compressed air foam system.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A telescopic fire control foam foamer characterized by comprising:

at least one level of nested first pipe (703) and second pipe (704), one end of the second pipe (704) is nested in the first pipe (703), and the other end of the second pipe (704) is positioned outside the first pipe (703);

a connection support (705) mounted to one end of the second pipe (704), the second pipe (704) being slidably mounted to the first pipe (703) through the connection support (705); and

and a baffle (706) attached to the connection support portion (705).

2. The telescopic fire fighting foam foamer of 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 fire fighting foam foamer of claim 1, characterized in that said connecting support (705) includes an overflow aperture (705 a) therethrough; the ratio of the diameter of the overflowing hole (705 a) to the diameter of the second pipe (704) is 1.05-1.1.

4. The telescopic fire fighting foam foamer of claim 3, characterized in that the axial length of the connection support (705) is 0.3-0.5 times the diameter of the overflowing hole (705 a).

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

6. The telescopic fire fighting foam foamer of claim 3, characterized in that the number of said baffle plates (706) is plural, and a plurality of said baffle plates (706) are arranged dispersed along the circumference of said flow-through hole (705 a).

7. The telescopic fire fighting foam foamer of claim 6, characterized in that one end of each baffle (706) is fixedly connected with the connecting support (705), and the other end of each baffle (706) is close to the central axis of the through-flow hole (705 a); the other ends of all the baffles (706) are positioned on the same circumference, and the diameter of the circumference is 0.5 to 0.7 times of that of the second pipe (704).

8. The telescopic fire fighting foam foamer of claim 3, characterized in that the other end of the baffle (706) is at a distance of 0.25 to 0.35 times the diameter of the through-flow hole (705 a) from the center axis of the through-flow hole (705 a).

9. The telescopic fire fighting foam foamer of claim 1, characterized in that the baffle (706) extends in the radial direction of the second tube (704), the maximally extending face of the baffle (706) being parallel to the cross section of the second tube (704).

10. The telescopic fire fighting foam foamer of claim 1, characterized in that the baffle (706) is constructed conical and the cone angle β of the baffle (706) is between 5 ° and 10 °.

11. 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) of any one of claims 1 to 10, which telescopic fire fighting foam foamer (700) is installed downstream of the fire fighting foam foaming device (100) and in series with both, for at least one foaming of the fire fighting foam delivered by the fire fighting foam foaming device (100).

12. The fire fighting foam foaming system of claim 11, wherein the fire fighting foam foaming device comprises:

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

the air nozzle assembly (120) comprises an air inlet hole (121), an air inlet hole (122), a first air outlet hole (123) and a flow guide part (124); the liquid inlet hole (121) is in fluid communication with the first flow path (111), and the liquid inlet hole (121) is located downstream of the first flow path (111); the intake 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) downstream of the first flow path (111) and the second flow path (112) and in fluid communication with both the first flow path (111) and the second flow path (112); the first air outlet hole (123) and the flow guide part (124) extend into the foam mixing chamber (130); the first air outlet hole (123) and the flow guide portion (124) are configured such that the air flow outputted via the air nozzle assembly (120) flows to different positions in a radial direction of the foam mixing chamber (130).

13. A fire fighting foam foaming system according to claim 11, wherein the deflector (124) comprises:

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

14. The fire fighting foam foaming system of claim 13, wherein the air nozzle assembly (120) comprises:

a mounting plate (125) attached 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 the mounting plate (125) on a side thereof remote from the two-phase flow injection seat (110); the axial line of the axial pipe (126) is parallel to the central axis of the two-phase flow injection seat (110); the axial tube (126) being in fluid communication with the air intake hole (122) of the mounting plate (125); and

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

15. The fire fighting foam foaming system of claim 14, wherein the axial tubes (126) are each plural in number, and the plural axial tubes (126) are arranged in a dispersed manner around a circumference of the mounting plate (125).

16. The firefighting foam foaming system of claim 14 wherein the other end of the axial tube (126) is distal from the two-phase flow injection seat (110); the other end of the axial pipe (126) is used as the first air outlet hole (123) and is open; the other end of the axial tube (126) is opposite to the inner wall of the foam mixing chamber (130).

17. Fire fighting foam foaming system according to claim 16, wherein the other end of the radial pipe (127) is remote from the axial pipe (126), the other end of the radial pipe (127) being closed; the side wall of the radial pipe (127) close to the other end of the axial pipe (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 the central axis of the two-phase flow injection seat (110), and the included angle is smaller than 90 degrees.

18. A fire fighting foam foaming system according to claim 12, wherein the deflector (124) comprises:

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

19. The fire fighting foam foaming system of claim 18, wherein the air nozzle assembly (120) further comprises:

a mounting plate (125) attached 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 the mounting plate (125) on a side thereof 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); the axial tube (126) being in fluid communication with the air intake hole (122) of the mounting plate (125);

wherein the baffle (124 ") is fixedly connected to the axial tube (126), the baffle (124") being configured without holes; the baffle (124 ") is configured to create a negative pressure region on a side of itself remote from the mounting plate (125) such that a portion of the airflow output by the axial tube (126) flows to the negative pressure region.

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

21. A fire fighting foam foaming system according to any one of claims 11 to 20, further comprising:

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

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

22. A fire fighting foam foaming system according to claim 12, characterized in that the inner wall of the foam mixing chamber (130) is configured conically; 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).

23. The fire fighting foam foaming system of claim 12, 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 passage (300) located upstream of the first passage (111) of the two-phase flow injection seat (110) to supply a foam concentrate to the two-phase flow injection seat (110); and

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

24. The fire fighting foam foaming system of claim 23, 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 spray 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 both 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) and the foam spray branch (600).

25. The fire fighting foam foaming system of claim 11, 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 rotating body (820) connected to the delivery pipe (810).

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

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

27. The fire fighting foam foaming system according to claim 11, wherein the length of the pipeline between the fire fighting foam foaming device (100) and the fire fighting foam foamer (700) is 10 to 20 times or more the maximum diameter of the pipeline.

28. A fire fighting foam foaming method, which is realized by the fire fighting foam foaming system of any one of claims 11 to 27, and comprises the following steps:

when the foam extinguishing agent needs to be sprayed, the foam extinguishing agent is sprayed according to a set first flow rate V _MI Delivering a foam mixture to a first inlet pipe (140) of the fire fighting foam foaming device (100);

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 a set third flow velocity V _F1 Delivering the fluid output by the fire fighting foam foaming device (100) to a telescopic fire fighting foam foaming machine (700).

29. The fire fighting foam expansion method of claim 28, wherein V is _Ml 6-8 m/s; and/or, the V _G Is 8 to 15m/s; and/or, the V _F1 5-10 m/s; and/or the presence of a gas in the atmosphere,

the flow velocity of foam mixed liquid injected into the inlet of the foam mixing chamber (130) of the fire-fighting foam foaming device (100) is V _1I ，V _1I Is 2m/s to 5m/s; and/or

The medicine is prepared fromThe flow rate of the compressed gas injected into the inlet of the foam mixing chamber (130) of the anti-foaming device (100) is V _1G ，V _I1G Is 10m/s to 20m/s; and/or

The flow rate of the foam outflow representation at the outlet of the foam mixing chamber (130) of the fire-fighting foam foaming device (100) is V _1O ，V _1O Is 4m/s to 8m/s.

30. A fire fighting foam foaming method according to claim 28, further comprising the steps of:

according to the set fourth flow velocity V _F2 Delivering fluid output by the telescopic fire fighting foam foamer (700) to an eductor (830).

31. The fire fighting foam foaming method of claim 30, wherein V is _F2 Is 6 to 12m/s.