Gas-liquid coaxial jet type foaming device and method

Abstract

The invention discloses a gas-liquid coaxial jet-type foaming device and method.The gas-liquid coaxial jet-type foaming device comprises a gas inlet mechanism, the gas inlet mechanism comprises gas inlet cavities, the gas inlet cavities are fixedly communicated with a plurality of sets of gas inlet pipelines, the gas inlet cavities are arranged in the circumferential direction at equal intervals, and first gas distribution systems and second gas distribution systems are installed in the gas inlet cavities; the mixing cavity is connected with the air inlet cavity; the liquid inlet mechanism comprises a liquid inlet pipeline, the liquid inlet pipeline penetrates through the air inlet cavity and extends into the mixing cavity, and a rectifying disc is mounted in the liquid inlet pipeline; the foaming mechanism comprises a foaming cavity, the foaming cavity is connected with the mixing cavity, an adjusting assembly is arranged between the mixing cavity and the foaming cavity, two sets of foaming nets are arranged on the adjusting assembly, and a foam outlet is formed in the bottom of the foaming cavity. The driving pressure of a gas source and a water source is fully utilized, the resistance loss in the mixed foaming process is reduced, the foaming performance of the device is improved, and the produced foam is high in multiple and long in range.

Description

Technical Field

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

[0002] With the rapid development of social economy and the continuous acceleration of industrialization and urbanization, especially the emergence of high-rise buildings, underground projects, inflammable and explosive units, and public gathering places with high density and large space, the scope, complexity, and difficulty of fire fighting operations and emergency rescue are constantly increasing. The disadvantages of traditional fire fighting technologies in actual combat as the first emergency rescue force are gradually emerging. As an energy-saving, environmentally friendly, and efficient fire fighting technology, the compressed air foam system (CAFS) has been gradually promoted and developed. CAFS has the advantages of large foam momentum, high fire extinguishing efficiency, long retention time, easy adjustment of foaming multiple, and light weight of the water delivery hose, and has attracted the widespread attention of countries around the world. The foam generator is a key part in CAFS that mixes foam liquid and compressed air to generate foam. Currently, CAFS generally does not have a dedicated gas-liquid mixer, and most of the compressed air and foam liquid are mixed by stirring in the pipeline to generate fire extinguishing foam. Moreover, the existing foam generating devices have the disadvantages that it is difficult to have both a high foaming multiple and a large foam outlet momentum at the same time.

[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 purpose, the present invention provides the following solution: The present invention provides a gas-liquid coaxial jet foaming device, including: An air intake mechanism, the air intake mechanism includes an air intake cavity, a plurality of groups of air intake pipelines are fixedly communicated with the air intake cavity, the plurality of air intake cavities are circumferentially arranged at equal intervals, a first air distribution system and a second air distribution system are installed in the air intake cavity, the first air distribution system is connected to the air intake pipeline, and the second air distribution system is communicated with the first air distribution system; A mixing cavity, the mixing cavity is connected to the air intake cavity; A liquid inlet mechanism, the liquid inlet mechanism includes a liquid inlet pipeline, the liquid inlet pipeline passes through the air intake cavity and extends into the mixing cavity, the liquid inlet pipeline is coaxially arranged with the air intake cavity, and a rectifying disk is installed in the liquid inlet pipeline; Foaming mechanism, the foaming mechanism includes a foaming cavity, the foaming cavity is connected to the mixing cavity, an adjusting component is arranged between the mixing cavity and the foaming cavity, two groups of foaming meshes are arranged on the adjusting component, and a foam outlet is opened at the bottom of the foaming cavity.

[0006] According to the gas-liquid coaxial jet foaming device provided by the present invention, the first gas distribution system includes a spiral air inlet pipe. There are several groups of spiral air inlet pipes, and several groups of spiral air inlet pipes are respectively connected to the air inlet pipeline. A number of holes are arrayed on the outer wall of the spiral air inlet pipe, and the holes are communicated with the air inlet cavity. The length of the air inlet cavity is 80mm - 120mm, the spiral height of the spiral air inlet pipe is 25mm - 40mm, the diameter of the holes is 3mm - 8mm, and the distance between adjacent holes is 10mm - 20mm.

[0007] According to the gas-liquid coaxial jet foaming device provided by the present invention, the second gas distribution system includes a gas flow equalizing disk. The gas flow equalizing disk is fixed in the air inlet cavity. A number of gradually changing flow equalizing channels are arrayed on the gas flow equalizing disk. The gradually changing flow equalizing channels are successively a tapered section and a diffuser section from top to bottom. The air inlet cavity is communicated with the mixing cavity through the gradually changing flow equalizing channels. Wherein, the bottom surface of the gas flow equalizing disk is an arc-shaped structure, and the angle of the arc corresponding to the center angle of the bottom surface is 90° - 120°.

[0008] According to the gas-liquid coaxial jet foaming device provided by the present invention, a first rectifying channel and a second rectifying channel are arranged in the rectifying disk, and the first rectifying channel and the second rectifying channel are coaxially arranged.

[0009] According to the gas-liquid coaxial jet foaming device provided by the present invention, the adjusting component includes a mounting ring. An annular groove is arranged inside the mounting ring. A pressing plate is fixed on the outer peripheral surface of the foaming mesh. The pressing plate on the foaming mesh located above is fixed in the annular groove, and the pressing plate on the foaming mesh located below is vertically slidably connected in the annular groove. Elastic members are respectively fixed between the two groups of pressing plates and between the pressing plate and the bottom wall of the annular groove. The elastic members can adaptively adjust the distance between the two groups of foaming meshes to be between 10mm - 30mm.

[0010] According to the gas-liquid coaxial jet foaming device provided by the present invention, the foaming mesh is a flat mesh or a curved mesh. The foaming mesh includes a central circular area 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.

[0011] According to the gas-liquid coaxial jet foaming device provided by the present invention, the bottom of the liquid inlet pipeline is of a tapered structure.

[0012] According to the gas-liquid coaxial jet foaming device provided by the present invention, the straight section at the bottom of the foaming cavity is connected to the foam outlet 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.

[0013] A gas-liquid coaxial jet foaming method includes the following steps: Step 1, gas introduction and preliminary distribution; Gas is introduced into the intake cavity through the intake pipeline in the intake mechanism. The gas enters the first gas distribution system through the intake pipeline, and the first gas distribution system enables the gas to be evenly distributed in the intake cavity, avoiding too high or too low local gas concentration, and providing a uniform gas source for subsequent gas-liquid mixing. Step 2, secondary gas distribution; The second gas distribution system is connected to the first gas distribution system to perform secondary distribution on the gas coming out of the first gas distribution system, ensuring a higher degree of uniformity of the gas before entering the mixing cavity. This secondary distribution helps to reduce the eddy current and turbulence of the gas in the mixing cavity and improve the gas-liquid mixing efficiency. Step 3, liquid introduction and rectification; Liquid is introduced into the mixing cavity 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 during the liquid flow, so that the liquid enters the mixing cavity at a more stable flow rate and direction, enabling the liquid and gas to be mixed more effectively. Step 4, gas-liquid mixing; In the mixing cavity, due to the jet action and turbulent mixing effect, the gas and liquid collide, shear and fuse with each other, and the gas is dispersed in the liquid in the form of tiny bubbles to form a gas-liquid mixture. Step 5, foaming and foam output; When the gas-liquid mixture passes through the foaming mesh, due to the restriction of the pores and the shearing action, the gas is further refined into smaller bubbles and evenly distributed in the liquid. At the same time, the liquid will also be subjected to a certain pressure change when passing through the foaming mesh to form foam, and the foam is output from the foam outlet at the bottom of the foaming cavity. The foaming cavity in the foaming mechanism is connected to the mixing cavity, and an adjusting component is arranged between the mixing cavity and the foaming cavity. Two groups of foaming meshes are installed on the adjusting component. The gas-liquid mixture is foamed through the foaming mesh to form foam, and 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 mesh and the mixing cavity to optimize the foaming effect.

[0014] The present invention discloses the following technical effects: The present invention adopts a coaxial design of the liquid inlet pipe and the gas inlet pipe, making full use of the power of the water source and the gas source, enabling the foam mixture and the gas to be fully mixed, and improving the foaming effect and the outlet kinetic energy of the foam. Compared with the traditional T-shaped and right-angle gas-liquid pipeline designs, the present invention effectively reduces the foaming resistance and greatly improves the foam production performance.

[0015] Through the design of the first gas distribution system and the second gas distribution system in the air intake mechanism, the uniform distribution of gas in the air intake cavity is realized, providing a good gas source for subsequent gas-liquid mixing. At the same time, the liquid inlet pipeline and the air intake cavity are coaxially arranged, and a rectifying disk is installed in the liquid inlet pipeline, which helps the liquid to smoothly enter the mixing cavity and efficiently mix with the gas to form a uniform gas-liquid mixture.

[0016] Two sets of foaming meshes are provided in the foaming mechanism. Through the adjustment component, the relative position and parameters between the foaming mesh and the mixing cavity can be accurately controlled to ensure that the gas-liquid mixture can form stable and uniform bubbles when passing through the foaming mesh. This design helps to improve the quality and stability of the foam and meet the requirements of different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic axial sectional view of the gas-liquid coaxial jet foamer of the present invention; Figure 2 It is a sectional view of the liquid inlet pipeline and the gas inlet pipeline of the present invention; Figure 3 It is a sectional view of the spiral gas inlet pipe of the present invention; Figure 4 It is a sectional view of the gas flow equalizing disk of the present invention; Figure 5 It is a top view of the rectifying disk of the present invention; Figure 6 It is a top view of the foaming mesh of the present invention; Figure 7 It is a sectional view of the elastic member of the present invention; Figure 8 It is a schematic diagram of the foam outlet structure of the present invention.

[0019] Among them, 1. Liquid inlet pipeline; 2. Air inlet pipeline; 3. Air inlet cavity; 4. Spiral air inlet pipe; 5. Hole; 6. Gas flow equalizing plate; 7. Gradual flow equalizing channel; 8. Rectifying plate; 9. Foaming net; 10. Adjusting component; 11. Elastic member; 12. Foaming cavity; 13. Foam outlet. Specific implementation manner

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0022] Refer to Figures 1-8 , the present invention provides a gas-liquid coaxial jet foaming device, including: An air intake mechanism, the air intake mechanism includes an air intake cavity 3, a plurality of groups of air inlet pipelines 2 are fixedly connected to the air intake cavity 3, a first air distribution system and a second air distribution system are installed in the air intake cavity 3 with a circumferential equal-spacing arrangement around the plurality of air intake cavities 3, the first air distribution system is connected to the air inlet pipeline 2, and the second air distribution system is communicated with the first air distribution system; A mixing cavity, the mixing cavity is connected to the air intake cavity 3; A liquid inlet mechanism, the liquid inlet mechanism includes a liquid inlet pipeline 1, the liquid inlet pipeline 1 passes through the air intake cavity 3 and extends into the mixing cavity, the liquid inlet pipeline 1 is coaxially arranged with the air intake cavity 3, and a rectifying plate 8 is installed in the liquid inlet pipeline 1; A foaming mechanism, the foaming mechanism includes a foaming cavity 12, the foaming cavity 12 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, and a foam outlet 13 is opened at the bottom of the foaming cavity 12.

[0023] In a further optimized solution, the first air distribution system includes a spiral air inlet pipe 4, there are a plurality of groups of spiral air inlet pipes 4, each group of spiral air inlet pipes 4 is respectively connected to the air inlet pipeline 2, a plurality of holes 5 are arrayed on the outer wall of the spiral air inlet pipe 4, and the holes 5 are communicated with the air intake cavity 3; The length of the air intake cavity 3 is 80 mm - 120 mm, the spiral height of the spiral air inlet pipe 4 is 25 mm - 40 mm, the diameter of the hole 5 is 3 mm - 8 mm, and the distance between adjacent holes 5 is 10 mm - 20 mm.

[0024] The pitch of the spiral air inlet pipe 4 increases sequentially from top to bottom The gas enters the spiral intake pipe 4 through the intake pipeline 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.

[0025] The gas enters the intake cavity 3 through the holes 5 on the outer wall of the spiral intake pipe. Due to the array distribution of the holes 5, the gas forms a multi-point and uniform diffusion effect in the intake cavity 3, avoiding the concentration of the gas in one area, thereby improving the uniformity of gas distribution.

[0026] Uniformity of spiral flow: The rotating flow design of the spiral intake pipe 4 enables the gas to be preliminarily mixed and diffused 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.

[0027] The array distribution of the holes 5 further enhances the uniformity of the gas in the intake cavity 3. Each hole 5 is equivalent to a gas outlet, and the gas enters the intake cavity 3 through multiple holes 5 simultaneously, making the gas distribution more uniform.

[0028] For a further optimized solution, the second gas distribution system includes a gas flow equalizing disk 6. The gas flow equalizing disk 6 is fixed in the intake cavity 3, and a number of gradually changing flow equalizing channels 7 are arrayed on the gas flow equalizing disk 6. The gradually changing flow equalizing channels 7 are successively a tapered section and a widened section from top to bottom; the intake cavity 3 is communicated with the mixing cavity through the gradually changing flow equalizing channels 7; Among them, the bottom surface of the gas flow equalizing disk 6 is an arc-shaped structure, and the angle of the arc corresponding to the bottom surface arc is 90° - 120°.

[0029] When the gas enters the tapered section of the gradually changing flow equalizing 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 current of the gas at the outlet of the first gas distribution system, making the gas flow more stable.

[0030] After the gas enters the widened section, the cross-sectional area of the flow channel gradually increases, the gas flow rate decreases, and the pressure recovers. This process further equalizes the gas distribution through the deceleration effect and reduces the energy loss at the same time.

[0031] The combined design of the tapered section and the widened section enables the gas to experience a dynamic balance process of acceleration - deceleration when passing through the flow equalizing channel, ultimately achieving a uniform distribution of flow rate and pressure. The length of the tapered section is greater than the length of the widened section.

[0032] The arc-shaped bottom surface evenly diffuses the gas from the central area to the surrounding through the curved surface design. The arc surface range with a central angle of 90° - 120° not only ensures the sufficiency of diffusion but also avoids the dispersion of the air flow caused by excessive diffusion.

[0033] The arc-shaped structure can prevent the formation of a local high-pressure area at the bottom of the flow equalizing plate by the gas, prevent the airflow from accumulating or generating turbulence at the outlet, and ensure that the gas enters the mixing chamber evenly.

[0034] The present invention uses a spiral hole 5 intake pipe and a gas uniform distribution hole plate structure to perform secondary flow equalization on the gas, providing a uniform gas source for foaming. The gas reaches the intake cavity 3 through the intake pipe, and during the flow process, the spiral hole 5 intake pipe of the intake cavity 3 performs primary flow equalization on the gas, and the gradually changing flow equalization channels 7 distributed by the gas flow equalizing plate 6 perform secondary flow equalization on the gas. This design ensures the uniformity of air intake and avoids poor foaming effect caused by excessive differences in gas velocity and flow rate.

[0035] In a further optimized solution, a first rectification channel and a second rectification channel are arranged inside the rectification plate 8, and the first rectification channel and the second rectification channel are coaxially arranged.

[0036] The present invention uses a unique rectification plate 8 to disperse the foam mixture, which diffuses from the inside to the outside in a frustum shape along the axis direction of the nozzle outlet and coincides with the surface of the foaming net 9, not only evenly distributing the liquid on the foaming net 9, but also expanding the contact area between the liquid and the air.

[0037] The inside of the rectification plate 8 is composed of three concentric four-leaf ellipses. The innermost four-leaf is a hollow part, the second four-leaf is a solid part, the three four-leaf ellipses gradually increase in size along the radius direction of the rectification plate 8, the outermost four-leaf is a hollow part, the length of the major axis of the ellipse of the innermost four-leaf is between 1.5 - 2.5 mm, the length of the minor axis is between 0.5 - 1.5 mm, the length of the major axis of the ellipse of the second four-leaf is between 4 - 8 mm, the length of the minor axis is between 1.5 - 5.5 mm, the length of the major axis of the outermost four-leaf ellipse is between 10 - 15 mm, and the length of the minor axis is between 6 - 10 mm.

[0038] The intersecting parts of the four ellipses are cut to form connection nodes. The middle four-leaf ellipse is fixed to the node part, and the inner four-leaf ellipse is fixed to the node of the middle part to form a rectification channel.

[0039] In a further optimized solution, the adjusting component 10 includes a mounting ring. An annular groove is arranged inside the mounting ring. A pressing plate is fixed on the outer peripheral surface of the foaming net 9. The pressing plate on the upper foaming net 9 is fixed in the annular groove, and the pressing plate on the lower foaming net 9 is vertically slidably connected in the annular groove. Elastic members 11 are respectively fixed between the two groups of pressing plates and between the pressing plate and the bottom wall of the annular groove. The elastic members 11 can adaptively adjust the distance between the two groups of foaming nets 9 to be between 10 mm - 30 mm.

[0040] Positioning blocks are arranged in the annular groove, and the positioning blocks are used to limit the maximum distance between the movable pressing plate and the fixed pressing plate.

[0041] For a further optimized solution, the foaming net 9 is a flat net or a curved net. The foaming net 9 includes a central circular area and an annular area outside the circular area. The diameter of the circular area is 36 mm - 45 mm, the pore diameter of the circular area is 0.5 mm - 0.6 mm, and the pore diameter of the annular area is 0.9 mm - 1.0 mm.

[0042] The foaming net 9 adopted in the present invention is divided into two areas. The central area is a small circular surface, and the remaining annular surface is the second area. The power of the foam mixture jet is utilized in a partitioned manner, avoiding the situation that the central area of the foaming net 9 is subjected to too large a jet impact force and the second area of the foaming net 9 is subjected to a smaller impact force, resulting in poor foaming effect. The present invention adopts an adaptive foaming net 9 adjustment structure, which can adjust the position of the foaming net 9 according to the impact force received by the foaming net 9, so that the foam mixture and the foaming net 9 are in full contact for foaming.

[0043] For a further optimized solution, the bottom of the liquid inlet pipeline 1 is of a tapered structure.

[0044] For a further optimized solution, the bottom straight section of the foaming cavity 12 and the foam outlet 13 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 12 is 30 mm - 40 mm.

[0045] The present invention adopts a gradually changing diameter structure to reduce the resistance loss of the produced foam moving to the outlet of the foaming device. At the same time, the foam flow is concentrated, reducing the air resistance when it is sprayed into the atmospheric environment.

[0046] A gas-liquid coaxial jet foaming method includes the following steps: Step 1, gas introduction and preliminary distribution; The gas is introduced into the intake cavity 3 through the intake pipeline 2 in the intake mechanism; The gas enters the first gas distribution system through the intake pipeline 2. The first gas distribution system enables the gas to be evenly distributed in the intake cavity 3, avoiding too high or too low local gas concentration, and providing a uniform gas source for subsequent gas-liquid mixing; Step 2, gas secondary distribution; The second gas distribution system is connected to the first gas distribution system, and the gas coming out of the first gas distribution system is subjected to secondary distribution to ensure that the gas reaches a higher degree of uniformity before entering the mixing cavity. This secondary distribution helps to reduce the vortex and turbulence of the gas in the mixing cavity and improve the gas-liquid mixing efficiency; Step 3, liquid introduction and rectification; The liquid is introduced into the mixing cavity through the liquid inlet pipeline 1 in the liquid inlet mechanism, and the liquid is rectified by the rectifying disk 8 to reduce the turbulence and vortex of the liquid during the flow process, so that the liquid enters the mixing cavity at a more stable flow rate and direction, enabling the liquid and the gas to be mixed more effectively; Step Four, gas-liquid mixing; In the mixing cavity, due to the jet action and turbulent mixing effect, the gas and liquid collide, shear and fuse with each other. The gas is dispersed in the liquid in the form of tiny bubbles, forming a gas-liquid mixture. Step Five, foaming and foam output; When the gas-liquid mixture passes through the foaming mesh 9, due to the restriction of the pores and the shearing action, the gas is further refined into smaller bubbles and evenly distributed in the liquid. At the same time, the liquid will also undergo a certain pressure change when passing through the foaming mesh 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. An adjusting component 10 is arranged between the mixing cavity and the foaming cavity 12. Two groups of foaming meshes 9 are installed on the adjusting component 10. The gas-liquid mixture is foamed through the foaming mesh 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 mesh 9 and the mixing cavity to optimize the foaming effect.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as a limitation to the present invention.

[0048] The embodiments described above are only used to describe the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A gas-liquid coaxial jet foaming device, characterized in that, Comprising: An intake mechanism, the intake mechanism including an intake cavity (3), a plurality of groups of intake pipelines (2) fixedly communicated with the intake cavity (3), the plurality of intake cavities (3) being arranged circumferentially at equal intervals, a first air distribution system and a second air distribution system being installed in the intake cavity (3), the first air distribution system being connected to the intake pipeline (2), and the second air distribution system being communicated with the first air distribution system; A mixing cavity, the mixing cavity being connected to the intake cavity (3); A liquid inlet mechanism, the liquid inlet mechanism including a liquid inlet pipeline (1), the liquid inlet pipeline (1) passing through the intake cavity (3) and extending into the mixing cavity, the liquid inlet pipeline (1) being coaxially arranged with the intake cavity (3), and a rectifying disc (8) being installed in the liquid inlet pipeline (1); A foaming mechanism, the foaming mechanism including a foaming cavity (12), the foaming cavity (12) being connected to the mixing cavity, an adjusting assembly (10) being arranged between the mixing cavity and the foaming cavity (12), two groups of foaming meshes (9) being arranged on the adjusting assembly (10), and a foam outlet (13) being opened at the bottom of the foaming cavity (12).

2. The gas-liquid coaxial jet foaming device according to claim 1, wherein: The first air distribution system includes spiral intake pipes (4), a plurality of groups of spiral intake pipes (4) being provided, the plurality of groups of spiral intake pipes (4) being respectively connected to the intake pipelines (2), a plurality of holes (5) being arrayed on the outer wall of the spiral intake pipes (4), and the holes (5) being communicated with the intake cavity (3); The length of the intake cavity (3) is 80 mm - 120 mm, the spiral height of the spiral intake pipes (4) is 25 mm - 40 mm, the diameter of the holes (5) is 3 mm - 8 mm, and the distance between adjacent holes (5) is 10 mm - 20 mm.

3. The gas-liquid coaxial jet foaming device according to claim 1, characterized in that: The second air distribution system includes a gas flow equalizing disc (6), the gas flow equalizing disc (6) being fixed in the intake cavity (3), a plurality of gradually changing flow equalizing channels (7) being arrayed on the gas flow equalizing disc (6), the gradually changing flow equalizing channels (7) being a gradually shrinking section and a gradually expanding section in sequence from top to bottom; the intake cavity (3) is communicated with the mixing cavity through the gradually changing flow equalizing channels (7); Wherein, the bottom surface of the gas flow equalizing disc (6) is an arc-shaped structure, and the angle of the arc corresponding to the bottom surface is 90° - 120°.

4. The gas-liquid coaxial jet foaming device according to claim 1, wherein: A first rectifying channel and a second rectifying channel are arranged in the rectifying disc (8), and the first rectifying channel and the second rectifying channel are coaxially arranged.

5. The gas-liquid coaxial jet foaming device according to claim 1, characterized in that: The adjusting assembly (10) includes a mounting ring, an annular groove being arranged on the inner side of the mounting ring, a pressing plate being fixed on the outer peripheral surface of the foaming mesh (9), the pressing plate on the foaming mesh (9) located above being fixed in the annular groove, the pressing plate on the foaming mesh (9) located below being vertically slidably connected in the annular groove, elastic members (11) being respectively fixed between the two groups of pressing plates and between the pressing plate and the bottom wall of the annular groove, and the elastic members (11) being capable of adaptively adjusting the distance between the two groups of foaming meshes (9) to be between 10 mm - 30 mm.

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

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

8. A gas-liquid coaxial jet foaming device according to claim 1, characterized in that: The bottom straight section of the foaming cavity (12) and the foam outlet (13) 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 (12) is 30 mm - 40 mm.

9. A gas-liquid coaxial jet foaming method, based on the gas-liquid coaxial jet foaming device according to any one of claims 1-8, characterized in that, It includes the following steps: Step 1, gas introduction and preliminary distribution; Step 2, secondary gas distribution; Step 3, liquid introduction and rectification; Step 4, gas-liquid mixing; Step 5, foaming and foam output.

10. A gas-liquid coaxial jet foaming method according to claim 9, characterized in that The specific process of Step 1 is: Gas is introduced into the intake cavity (3) through the intake pipeline (2) in the intake mechanism; The gas enters the first gas distribution system through the intake pipeline (2), and the first gas distribution system enables the gas to be evenly distributed in the intake cavity (3), avoiding too high or too low local gas concentration, 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 the gas coming out of the first gas distribution system is secondarily distributed to ensure a higher degree of uniformity of the gas before entering the mixing cavity. This secondary distribution helps to reduce the eddy current and turbulence of the gas in the mixing cavity and improve the gas-liquid mixing efficiency; The specific process of Step 3 is: Liquid is introduced into the mixing cavity through the liquid inlet pipeline (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 cavity at a more stable flow rate and direction, enabling the liquid and gas to be mixed more effectively; The specific process of Step 4 is: In the mixing cavity, due to the jet action and turbulent mixing effect, the gas and liquid collide, shear and fuse with each other, and the gas is dispersed in the liquid in the form of tiny bubbles to form a gas-liquid mixture; The specific process of Step 5 is: When the gas-liquid mixture passes through the foaming net (9), due to the restriction of the pore channels and the shearing action, the gas is further refined into smaller bubbles and evenly distributed in the liquid. At the same time, the liquid will also be subjected to a certain pressure change when passing 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 foaming cavity (12) in the foaming mechanism is connected to the mixing cavity, and an adjusting component (10) is arranged 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.

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