A gas-liquid coaxial jet foaming device and method

Abstract

The present invention discloses a gas-liquid coaxial jet foaming device and method, comprising: an air intake mechanism, the air intake mechanism including an air intake cavity, the air intake cavity being fixedly connected to a plurality of air intake pipes, the plurality of air intake cavities being circumferentially evenly spaced, a first air distribution system and a second air distribution system being installed in the air intake cavity; a mixing cavity, the mixing cavity being connected to the air intake cavity; a liquid intake mechanism, the liquid intake mechanism including a liquid intake pipe, the liquid intake pipe passing through the air intake cavity and extending into the mixing cavity, a rectifier disk being installed in the liquid intake pipe; a foaming mechanism, the foaming mechanism including a foaming cavity, the foaming cavity being connected to the mixing cavity, an adjustment component being provided between the mixing cavity and the foaming cavity, two groups of foaming nets being provided on the adjustment component, and a foam outlet being provided at the bottom of the foaming cavity. The present invention fully utilizes the driving pressure of the air source and the water source, reduces the resistance loss in the mixing and foaming process, improves the foaming performance of the device, and produces a high foam multiple and a long range.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air foam preparation, and in particular to a gas-liquid coaxial jet foaming device and method. Background Art

[0002] With the rapid development of society and the accelerating pace of industrialization and urbanization, the scope, complexity, and difficulty of firefighting and emergency rescue operations are increasing. The rapid emergence of high-rise buildings, underground engineering projects, flammable and explosive facilities, and high-density, large-scale public gathering places are increasing. Traditional firefighting techniques are becoming increasingly vulnerable when used as the primary emergency rescue force in actual combat. Compressed air foam systems (CAFS) are gaining popularity and development as energy-saving, environmentally friendly, and highly effective firefighting technologies. CAFS boasts advantages such as high foam momentum, high firefighting efficiency, long retention time, easily adjustable foaming ratio, and lightweight delivery hoses, attracting widespread attention worldwide. The foam generator is the key component in CAFS, mixing the foam liquid and compressed air to produce the foam. Currently, CAFS generally lack dedicated gas-liquid mixers. Instead, the compressed air and foam mixture is typically stirred and mixed in pipelines to produce firefighting foam. Furthermore, existing foam generators suffer from the drawback of being unable to achieve both a high foaming ratio and a high foam outlet momentum.

[0003] Based on the above technical problems, the present invention provides a gas-liquid coaxial jet foaming device and method. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas-liquid coaxial jet foaming device and method to solve the problems existing in the prior art.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a gas-liquid coaxial jet foaming device, comprising:

[0006] An air intake mechanism includes an air intake cavity, wherein a plurality of air intake pipes are fixedly connected to the air intake cavity, and the plurality of air intake cavities are arranged at equal intervals around the circumference. A first air distribution system and a second air distribution system are installed in the air intake cavity, wherein the first air distribution system is connected to the air intake pipes, and the second air distribution system is connected to the first air distribution system;

[0007] a mixing cavity, the mixing cavity being connected to the air inlet cavity;

[0008] A liquid inlet mechanism, comprising a liquid inlet pipeline, the liquid inlet pipeline passing through the air inlet cavity and extending into the mixing cavity, the liquid inlet pipeline being coaxially arranged with the air inlet cavity, and a rectifying disc being installed in the liquid inlet pipeline;

[0009] The foaming mechanism includes a foaming cavity, the foaming cavity is connected to the mixing cavity, an adjustment component is provided between the mixing cavity and the foaming cavity, two groups of foaming nets are provided on the adjustment component, and a foam outlet is opened at the bottom of the foaming cavity.

[0010] According to the gas-liquid coaxial jet foaming device provided by the present invention, the first air distribution system includes a spiral air inlet pipe, the spiral air inlet pipe is provided in a plurality of groups, the plurality of spiral air inlet pipes are respectively connected to the air inlet pipeline, and the outer wall of the spiral air inlet pipe is provided with a plurality of holes in an array, the holes being connected to the air inlet cavity;

[0011] The length of the air intake cavity is 80mm-120mm, the spiral height of the spiral air intake pipe is 25mm-40mm, the diameter of the hole is 3mm-8mm, and the distance between adjacent holes is 10mm-20mm.

[0012] According to the gas-liquid coaxial jet foaming device provided by the present invention, the second gas distribution system includes a gas flow balancing plate, which is fixed in the gas inlet cavity. The gas flow balancing plate is arrayed with a plurality of gradual flow balancing channels, which are a gradually contracting section and a gradually expanding section from top to bottom. The gas inlet cavity and the mixing cavity are connected through the gradual flow balancing channels.

[0013] The bottom surface of the gas flow balancing disk is an arc-shaped structure, and the angle of the bottom arc corresponding to the central angle is 90°-120°.

[0014] According to the gas-liquid coaxial jet foaming device provided by the present invention, a first rectifying channel and a second rectifying channel are provided in the rectifying disk, and the first rectifying channel and the second rectifying channel are coaxially arranged.

[0015] According to the gas-liquid coaxial jet foaming device provided by the present invention, the adjustment component includes a mounting ring, an annular groove is provided on the inner side of the mounting ring, a pressure plate is fixed to the outer peripheral surface of the foaming net, the pressure plate on the upper foaming net is fixed in the annular groove, and the pressure plate on the lower foaming net is vertically slidably connected in the annular groove, and elastic components are respectively fixed between the two groups of pressure plates and between the pressure plate and the bottom wall of the annular groove, and the elastic components can make the distance between the two groups of foaming nets adaptively adjusted between 10mm-30mm.

[0016] According to the gas-liquid coaxial jet foaming device provided by the present invention, the foaming net is a flat net or a curved net, and the foaming net includes a circular area in the center and an annular area outside the circular area. The diameter of the circular area is 36mm-45mm, the aperture of the circular area is 0.5mm-0.6mm, and the aperture of the annular area is 0.9mm-1.0mm.

[0017] According to the gas-liquid coaxial jet foaming device provided by the present invention, the bottom of the liquid inlet pipeline is a tapered structure.

[0018] According to the gas-liquid coaxial jet foaming device provided by the present invention, the straight section at the bottom of the foaming cavity and the foam outlet are connected by an arc transition section, and the central angle of the arc corresponding to the arc transition is 44°-62°, and the minimum straight-line distance between the center of the arc and the inner wall of the foaming cavity is 30mm-40mm.

[0019] A gas-liquid coaxial jet foaming method comprises the following steps:

[0020] Step 1: gas introduction and initial distribution;

[0021] The gas is introduced into the intake cavity through the intake pipe in the intake mechanism;

[0022] The gas enters the first gas distribution system through the air inlet pipeline. The first gas distribution system enables the gas to be evenly distributed in the air inlet cavity, avoiding excessively high or low local gas concentrations, and providing a uniform gas source for subsequent gas-liquid mixing;

[0023] Step 2: secondary distribution of gas;

[0024] The second gas distribution system is connected to the first gas distribution system and performs secondary distribution on the gas coming out of the first gas distribution system to ensure that the gas reaches a higher uniformity before entering the mixing chamber. This secondary distribution helps to reduce eddy currents and turbulence of the gas in the mixing chamber and improve the gas-liquid mixing efficiency.

[0025] Step 3: Liquid introduction and rectification;

[0026] The liquid is introduced into the mixing chamber through the liquid inlet pipeline in the liquid inlet mechanism, and the liquid is rectified by the rectifying disk to reduce the turbulence and eddy current of the liquid during the flow process, so that the liquid enters the mixing chamber with a more stable flow rate and direction, so that the liquid and gas are mixed more effectively;

[0027] Step 4: gas-liquid mixing;

[0028] In the mixing chamber, the gas and liquid collide, shear and merge with each other due to the jet action and turbulent mixing effect. The gas is dispersed in the liquid in the form of tiny bubbles to form a gas-liquid mixture.

[0029] Step 5: Foaming and foam output;

[0030] When the gas-liquid mixture passes through the foaming net, due to the restriction of the pores and the shearing effect, the gas is further refined into smaller bubbles and evenly distributed in the liquid. At the same time, the liquid will also be subject to a certain pressure change when passing through the foaming net, forming foam, which is output from the foam outlet at the bottom of the foaming cavity.

[0031] The foaming cavity in the foaming mechanism is connected to the mixing cavity. An adjusting component is provided between the mixing cavity and the foaming cavity. Two sets of foaming nets are installed on the adjusting component. The gas-liquid mixture is foamed through the foaming net to form foam. The foam is output from the foam outlet at the bottom of the foaming cavity. The adjusting component can adjust the distance between the foaming net and the mixing cavity to optimize the foaming effect.

[0032] The present invention discloses the following technical effects:

[0033] This invention utilizes a coaxial liquid and gas inlet pipe design, fully utilizing the power of the water and gas sources to fully mix the foam mixture and gas, improving the foaming effect and the foam's outlet kinetic energy. Compared to traditional T-shaped and right-angle gas-liquid piping designs, this invention effectively reduces foaming resistance and significantly improves foam production performance.

[0034] The design of the first and second air distribution systems within the air intake mechanism achieves uniform distribution of gas within the intake chamber, providing a good gas source for subsequent gas-liquid mixing. Furthermore, the liquid inlet line is coaxially arranged with the intake chamber and equipped with a rectifier disc, which helps the liquid enter the mixing chamber smoothly and mix efficiently with the gas, forming a uniform gas-liquid mixture.

[0035] The foaming mechanism features two sets of foaming nets. Adjusting the components allows for precise control of the relative position and parameters between the foaming nets and the mixing chamber, ensuring stable, uniform bubbles form as the gas-liquid mixture passes through the nets. This design improves foam quality and stability, meeting the needs of diverse applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a schematic axial cross-sectional view of the gas-liquid coaxial jet foamer of the present invention;

[0038] Figure 2 This is a cross-sectional view of the liquid inlet pipeline and the air inlet pipeline of the present invention;

[0039] Figure 3 This is a cross-sectional view of the spiral air intake pipe of the present invention;

[0040] Figure 4 This is a cross-sectional view of the gas flow balancing disk of the present invention;

[0041] Figure 5 This is a top view of the rectifier disc of the present invention;

[0042] Figure 6 This is a top view of the foaming net of the present invention;

[0043] Figure 7 is a cross-sectional view of the elastic member of the present invention;

[0044] Figure 8 This is a schematic diagram of the foam outlet structure of the present invention.

[0045] Among them, 1. liquid inlet pipeline; 2. air inlet pipeline; 3. air inlet cavity; 4. spiral air inlet pipe; 5. hole; 6. gas equalizing disk; 7. gradual equalizing channel; 8. rectifier disk; 9. foaming net; 10. adjustment component; 11. elastic component; 12. foaming cavity; 13. foam outlet. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Reference Figures 1-8 The present invention provides a gas-liquid coaxial jet foaming device, comprising:

[0049] The air intake mechanism includes an air intake cavity 3, and a plurality of air intake pipes 2 are fixedly connected to the air intake cavity 3. The plurality of air intake cavities 3 are arranged at equal intervals around the circumference. A first air distribution system and a second air distribution system are installed in the air intake cavity 3. The first air distribution system is connected to the air intake pipes 2, and the second air distribution system is connected to the first air distribution system.

[0050] A mixing chamber connected to the air inlet chamber 3;

[0051] The liquid inlet mechanism includes a liquid inlet pipeline 1, which passes through the air inlet cavity 3 and extends into the mixing cavity. The liquid inlet pipeline 1 is coaxially arranged with the air inlet cavity 3, and a rectifying disk 8 is installed in the liquid inlet pipeline 1;

[0052] The foaming mechanism includes a foaming cavity 12, which is connected to the mixing cavity. An adjusting component 10 is arranged between the mixing cavity and the foaming cavity 12. Two groups of foaming nets 9 are arranged on the adjusting component 10. A foam outlet 13 is opened at the bottom of the foaming cavity 12.

[0053] Further optimized, the first air distribution system includes a spiral air inlet pipe 4, which is provided in a plurality of groups, each of which is connected to the air inlet pipe 2, and an array of holes 5 is provided on the outer wall of the spiral air inlet pipe 4, which is connected to the air inlet cavity 3;

[0054] The length of the air intake cavity 3 is 80 mm to 120 mm, the spiral height of the spiral air intake pipe 4 is 25 mm to 40 mm, the diameter of the hole 5 is 3 mm to 8 mm, and the distance between adjacent holes 5 is 10 mm to 20 mm.

[0055] The pitch of the spiral intake pipe 4 increases from top to bottom.

[0056] The gas enters the spiral intake pipe 4 through the intake pipe 2. Due to the rotating structure of the spiral intake pipe 4, the gas will rotate when flowing in the pipe, increasing the contact area and time between the gas and the pipe wall.

[0057] The gas enters the air inlet cavity 3 through the holes 5 on the outer wall of the spiral air inlet pipe. Due to the array distribution of the holes 5, the gas forms a multi-point, uniform diffusion effect in the air inlet cavity 3, avoiding the gas from concentrating in one area, thereby improving the uniformity of gas distribution.

[0058] Uniformity of spiral flow: The rotating flow design of the spiral intake pipe 4 allows the gas to undergo preliminary mixing and diffusion before entering the intake cavity 3, reducing the eddy current and turbulence of the gas in the intake cavity 3 and improving the uniformity of gas distribution.

[0059] The array distribution of the holes 5 further enhances the uniformity of the gas in the air inlet cavity 3. Each hole 5 is equivalent to a gas outlet, and the gas enters the air inlet cavity 3 through multiple holes 5 at the same time, making the gas distribution more uniform.

[0060] Further optimized, the second gas distribution system includes a gas flow plate 6, which is fixed in the air inlet cavity 3. The gas flow plate 6 is arrayed with a plurality of gradient flow channels 7. The gradient flow channels 7 are arranged in a gradually contracting section and a gradually expanding section from top to bottom. The air inlet cavity 3 and the mixing cavity are connected through the gradient flow channels 7.

[0061] The bottom surface of the gas flow balancing plate 6 is an arc-shaped structure, and the angle of the bottom arc corresponding to the central angle is 90°-120°.

[0062] When the gas enters the tapered section of the gradual flow equalization channel 7, the cross-sectional area of the flow channel gradually decreases, the gas flow rate increases, and the pressure decreases. This acceleration effect can eliminate the turbulence and eddy currents of the gas at the outlet of the first gas distribution system, making the gas flow more stable.

[0063] After the gas enters the diverging section, the cross-sectional area of the flow channel gradually increases, the gas velocity decreases, and the pressure recovers. This process further evens out the gas distribution through the deceleration effect, while reducing energy loss.

[0064] The combined design of the converging and expanding sections allows the gas to undergo a dynamic equilibrium process of acceleration and deceleration as it passes through the flow-balancing channel, ultimately achieving uniform distribution of flow velocity and pressure. The length of the converging section is greater than that of the expanding section.

[0065] The arc-shaped bottom surface is designed to evenly diffuse the air from the center to the surrounding area. The arc surface range of 90°-120° at the center of the circle ensures sufficient diffusion while avoiding airflow dispersion caused by excessive diffusion.

[0066] The curved surface structure can avoid the formation of a local high-pressure area at the bottom of the flow equalizer, prevent the air flow from accumulating or generating turbulence at the outlet, and ensure that the gas enters the mixing chamber evenly.

[0067] The present invention utilizes a spiral perforated air intake pipe (5) and a gas distribution plate structure for secondary gas flow balancing, providing a uniform gas source for foaming. Gas enters the air intake chamber (3) through the air intake pipe. During its flow, the spiral perforated air intake pipe (5) provides primary flow balancing, and the gas is then distributed through the gas distribution plate (6) for secondary flow balancing. This design ensures uniform air intake and avoids poor foaming results caused by large variations in gas velocity and flow rate.

[0068] According to a further optimized solution, a first rectifying channel and a second rectifying channel are provided in the rectifying disk 8 , and the first rectifying channel and the second rectifying channel are coaxially arranged.

[0069] The present invention adopts a unique rectifying disk 8 to disperse the foam mixture, which diffuses from the inside to the outside in a truncated cone shape along the axis of the nozzle outlet and moves to the surface of the foaming net 9 to coincide with it, which not only evens out the distribution of the liquid on the foaming net 9, but also expands the contact area between the liquid and the air.

[0070] The interior of the rectifier disk 8 is composed of three concentric four-lobed ellipses, the centermost four lobes are hollow parts, the second four lobes are solid parts, and the three four-lobed ellipses become larger in the radial direction of the rectifier disk 8. The outermost four lobes are hollow parts. The length of the major semi-axis of the ellipse of the centermost four lobes is between 1.5-2.5 mm, and the length of the minor semi-axis is between 0.5-1.5 mm. The length of the major semi-axis of the ellipse of the second four lobes is between 4-8 mm, and the length of the minor semi-axis is between 1.5-5.5 mm. The length of the major semi-axis of the outermost four-lobed ellipse is between 10-15 mm, and the length of the minor semi-axis is between 6-10 mm.

[0071] The four ellipses are staggered and cut to form a connection node. The four-leaf ellipse in the middle part is fixed to the node part, and the inner four-leaf ellipse is fixed to the node in the middle part to form a rectification channel.

[0072] Further optimization scheme, the adjustment component 10 includes a mounting ring, an annular groove is provided on the inner side of the mounting ring, a pressure plate is fixed on the outer peripheral surface of the foaming net 9, the pressure plate on the upper foaming net 9 is fixed in the annular groove, and the pressure plate on the lower foaming net 9 is vertically slidably connected in the annular groove, and elastic components 11 are fixed between the two groups of pressure plates and between the pressure plate and the bottom wall of the annular groove respectively. The elastic component 11 can make the distance between the two groups of foaming nets 9 adaptively adjusted between 10mm-30mm.

[0073] A positioning block is arranged in the annular groove, and the positioning block is used to limit the maximum distance between the movable pressing plate and the fixed pressing plate.

[0074] Further optimization scheme, the foaming net 9 is a flat net or a curved net, and the foaming net 9 includes a circular area in the center and an annular area outside the circular area. The diameter of the circular area is 36mm-45mm, the aperture of the circular area is 0.5mm-0.6mm, and the aperture of the annular area is 0.9mm-1.0mm.

[0075] The foaming net 9 employed in the present invention is divided into two zones: a central zone with a small circular surface and a secondary zone with a remaining annular surface. This zonal utilization of the power of the foam mixture jet prevents excessive impact force on the central zone of the foaming net 9, while the secondary zone receives less impact force, resulting in poor foaming performance. The present invention employs an adaptive adjustment mechanism for the foaming net 9, allowing it to adjust its position based on the impact force, ensuring sufficient contact between the foam mixture and the net 9 for foaming.

[0076] According to a further optimized solution, the bottom of the liquid inlet pipeline 1 is a tapered structure.

[0077] A further optimized solution is to use an arc transition section to connect the straight section at the bottom of the foaming cavity 12 and the foam outlet 13, and the central angle of the arc corresponding to the arc transition is 44°-62°, and the minimum straight-line distance between the center of the arc and the inner wall of the foaming cavity 12 is 30mm-40mm.

[0078] The invention adopts a gradually changing diameter structure to reduce the resistance loss of the output foam moving to the outlet of the foaming device, and at the same time concentrates the foam flow beam to reduce the air resistance when the foam is sprayed into the atmospheric environment.

[0079] A gas-liquid coaxial jet foaming method comprises the following steps:

[0080] Step 1: gas introduction and initial distribution;

[0081] The gas is introduced into the intake cavity 3 through the intake pipe 2 in the intake mechanism;

[0082] The gas enters the first gas distribution system through the gas inlet pipe 2. The first gas distribution system enables the gas to be evenly distributed in the gas inlet cavity 3, avoiding excessively high or low local gas concentrations, and providing a uniform gas source for subsequent gas-liquid mixing;

[0083] Step 2: secondary distribution of gas;

[0084] The second gas distribution system is connected to the first gas distribution system and performs secondary distribution on the gas coming out of the first gas distribution system to ensure that the gas reaches a higher uniformity before entering the mixing chamber. This secondary distribution helps to reduce eddy currents and turbulence of the gas in the mixing chamber and improve the gas-liquid mixing efficiency.

[0085] Step 3: Liquid introduction and rectification;

[0086] The liquid is introduced into the mixing chamber through the liquid inlet pipe 1 in the liquid inlet mechanism, and the liquid is rectified by the rectifying disk 8 to reduce the turbulence and eddy current of the liquid during the flow process, so that the liquid enters the mixing chamber at a more stable flow rate and direction, so that the liquid and gas are mixed more effectively;

[0087] Step 4: gas-liquid mixing;

[0088] In the mixing chamber, the gas and liquid collide, shear and merge with each other due to the jet action and turbulent mixing effect. The gas is dispersed in the liquid in the form of tiny bubbles to form a gas-liquid mixture.

[0089] Step 5: Foaming and foam output;

[0090] When the gas-liquid mixture passes through the foaming net 9, due to the restriction of the pores and the shearing effect, the gas is further refined into smaller bubbles and evenly distributed in the liquid. At the same time, the liquid is also subjected to a certain pressure change when passing through the foaming net 9, forming foam, which is output from the foam outlet 13 at the bottom of the foaming cavity 12;

[0091] The foaming cavity 12 in the foaming mechanism is connected to the mixing cavity. An adjusting component 10 is provided between the mixing cavity and the foaming cavity 12. Two groups of foaming nets 9 are installed on the adjusting component 10. The gas-liquid mixture is foamed through the foaming net 9 to form foam, and the foam is output from the foam outlet 13 at the bottom of the foaming cavity 12. The adjusting component 10 can adjust the distance between the foaming net 9 and the mixing cavity to optimize the foaming effect.

[0092] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0093] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A gas-liquid coaxial jet foaming device, characterized in that: include: An air intake mechanism, the air intake mechanism comprising an air intake cavity (3), the air intake cavity (3) being fixedly connected to a plurality of groups of air intake pipes (2), the plurality of air intake cavities (3) being arranged at equal intervals in the circumferential direction, a first air distribution system and a second air distribution system being installed in the air intake cavity (3), the first air distribution system being connected to the air intake pipes (2), and the second air distribution system being connected to the first air distribution system; A mixing cavity, the mixing cavity being connected to the air inlet cavity (3); A liquid inlet mechanism, the liquid inlet mechanism comprising a liquid inlet pipeline (1), the liquid inlet pipeline (1) passing through the air inlet cavity (3) and extending into the mixing cavity, the liquid inlet pipeline (1) being coaxially arranged with the air inlet cavity (3), and a rectifying disc (8) being installed in the liquid inlet pipeline (1); A foaming mechanism, the foaming mechanism comprising a foaming cavity (12), the foaming cavity (12) being connected to the mixing cavity, an adjusting component (10) being provided between the mixing cavity and the foaming cavity (12), two groups of foaming nets (9) being provided on the adjusting component (10), and a foam outlet (13) being provided at the bottom of the foaming cavity (12); The first air distribution system comprises a spiral air intake pipe (4), wherein the spiral air intake pipe (4) is provided in a plurality of groups, wherein the plurality of groups of the spiral air intake pipes (4) are respectively connected to the air intake pipeline (2), and an array of holes (5) is provided on the outer wall of the spiral air intake pipe (4), wherein the holes (5) are in communication with the air intake cavity (3); The length of the air intake cavity (3) is 80 mm to 120 mm, the spiral height of the spiral air intake pipe (4) is 25 mm to 40 mm, the diameter of the hole (5) is 3 mm to 8 mm, and the distance between adjacent holes (5) is 10 mm to 20 mm; The second gas distribution system comprises a gas flow balancing plate (6), the gas flow balancing plate (6) is fixed in the gas inlet cavity (3), and a plurality of gradient flow balancing channels (7) are arranged in an array on the gas flow balancing plate (6), and the gradient flow balancing channels (7) are a gradually contracting section and a gradually expanding section from top to bottom; the gas inlet cavity (3) and the mixing cavity are connected through the gradient flow balancing channels (7); The bottom surface of the gas flow balancing disk (6) is an arc-shaped structure, and the angle of the bottom arc corresponding to the central angle is 90°-120°.

2. The gas-liquid coaxial jet foaming device according to claim 1, characterized in that: A first rectifying channel and a second rectifying channel are provided in the rectifying disk (8), and the first rectifying channel and the second rectifying channel are coaxially arranged.

3. The gas-liquid coaxial jet foaming device according to claim 1, characterized in that: The adjustment assembly (10) includes a mounting ring, an annular groove is provided on the inner side of the mounting ring, a pressure plate is fixed to the outer peripheral surface of the foaming net (9), the pressure plate on the upper foaming net (9) is fixed in the annular groove, and the pressure plate on the lower foaming net (9) is vertically slidably connected in the annular groove, and elastic components (11) are respectively fixed between the two groups of pressure plates and between the pressure plates and the bottom wall of the annular groove, and the elastic components (11) can make the distance between the two groups of foaming nets (9) adaptively adjusted between 10 mm and 30 mm.

4. The gas-liquid coaxial jet foaming device according to claim 1, characterized in that: The foaming net (9) is a flat net or a curved net, and comprises a central circular area and an annular area outside the circular area. The diameter of the circular area is 36 mm to 45 mm, the aperture of the circular area is 0.5 mm to 0.6 mm, and the aperture of the annular area is 0.9 mm to 1.0 mm.

5. The gas-liquid coaxial jet foaming device according to claim 1, characterized in that: The bottom of the liquid inlet pipeline (1) is a tapered structure.

6. The gas-liquid coaxial jet foaming device according to claim 1, characterized in that: The straight line section at the bottom of the foaming cavity (12) and the foam outlet (13) are connected by an arc transition section, and the center angle of the arc corresponding to the arc transition is 44°-62°, and the minimum straight-line distance between the center of the arc and the inner wall of the foaming cavity (12) is 30mm-40mm.

7. A gas-liquid coaxial jet foaming method, based on the gas-liquid coaxial jet foaming device according to any one of claims 1 to 6, characterized in that: The steps include: Step 1: gas introduction and initial distribution; Step 2: secondary distribution of gas; Step 3: Liquid introduction and rectification; Step 4: gas-liquid mixing; Step 5: Foaming and foam output.

8. The gas-liquid coaxial jet foaming method according to claim 7, characterized in that: The specific process of step one is: Introducing gas into the air intake cavity (3) through the air intake pipeline (2) in the air intake mechanism; The gas enters the first gas distribution system through the gas inlet pipeline (2), and the first gas distribution system enables the gas to be evenly distributed in the gas inlet cavity (3), thereby avoiding excessively high or low local gas concentrations and providing a uniform gas source for subsequent gas-liquid mixing; The specific process of step 2 is: The second gas distribution system is connected to the first gas distribution system and performs secondary distribution on the gas coming out of the first gas distribution system to ensure that the gas reaches a higher uniformity before entering the mixing chamber. This secondary distribution helps to reduce eddy currents and turbulence of the gas in the mixing chamber and improve the gas-liquid mixing efficiency. The specific process of step three is: The liquid is introduced into the mixing chamber through the liquid inlet pipe (1) in the liquid inlet mechanism, and the liquid is rectified by the rectifying disk (8), thereby reducing the turbulence and eddy current of the liquid during the flow process, so that the liquid enters the mixing chamber at a more stable flow rate and direction, thereby achieving more effective mixing of the liquid and the gas; The specific process of step four is: In the mixing chamber, the gas and liquid collide, shear and merge with each other due to the jet action and turbulent mixing effect. The gas is dispersed in the liquid in the form of tiny bubbles to form a gas-liquid mixture. The specific process of step five is: When the gas-liquid mixture passes through the foaming net (9), the gas is further refined into smaller bubbles due to the restriction of the pores and the shearing effect, and is evenly distributed in the liquid. At the same time, the liquid is also subjected to a certain pressure change when passing through the foaming net (9), forming foam, and the foam is output from the foam outlet (13) at the bottom of the foaming cavity (12); The foaming cavity (12) in the foaming mechanism is connected to the mixing cavity, and an adjusting component (10) is provided between the mixing cavity and the foaming cavity (12). Two groups of foaming nets (9) are installed on the adjusting component (10). The gas-liquid mixture is foamed through the foaming nets (9) to form foam, and the foam is output from the foam outlet (13) at the bottom of the foaming cavity (12). The adjusting component (10) can adjust the distance between the foaming nets (9) and the mixing cavity to optimize the foaming effect.

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