Spinning system based on slit type coaxial double air flow stretch gas jet spinning nozzle

Abstract

This invention provides a spinning system based on a slit-type coaxial dual-airflow stretching airjet spinning nozzle, relating to the field of spinning technology. The system includes a slit-type coaxial dual-airflow stretching airjet spinning nozzle and a controller. The slit-type coaxial dual-airflow stretching airjet spinning nozzle comprises a first cylindrical structure, a second cylindrical structure, and a third cylindrical structure. The second cylindrical structure is disposed within the first cylindrical structure, and the third cylindrical structure is disposed within the second cylindrical structure. The first, second, and third cylindrical structures are coaxially arranged. This invention can alter the "straight portion" and "curved portion" of fiber formation, thereby increasing the "whipping motion" of the fiber, ultimately promoting fiber stretching and solvent evaporation. This results in better spinning quality and nozzle cleaning effect for the spun fibers produced by this nozzle.

Description

Technical Field

[0001] This invention relates to the field of spinning technology, and in particular to a spinning system based on a slit-type coaxial dual-airflow stretching air jet spinning nozzle. Background Technology

[0002] Currently, common methods for preparing ultrafine fibers include island-island spinning, melt-blown spinning, electrospinning, and solution-by-spinning (SBS). Island-island spinning is one of the earliest developed spinning methods. The fibers produced by this method have extremely small fineness and large surface area, giving them various excellent properties. However, due to its complex operation and environmental pollution, it is not yet widely used. Electrospinning is a method that forms ultrafine nanofibers from a polymer solution under the influence of an electric field. This method has advantages such as simple operation, wide applicability, and easy equipment setup, and is therefore widely used. However, due to its low preparation efficiency, much research is still needed to achieve industrial-scale preparation of ultrafine nanofibers. Melt spinning involves forming fibers from molten polymer under the influence of a high-temperature gas flow. The nonwoven fabric prepared by this method has the advantages of fine fibers, loose structure with many small pores and good wrinkle resistance. However, its significant problem is that the melting point of the polymer used must be lower than the decomposition point, which greatly reduces the types of polymers that can be used. SBS is a product based on the combination of electrospinning and meltblown spinning. It uses the high-speed airflow in meltblown spinning as the driving force to achieve the stretching and refinement of the solution jet, and finally solidifies into fibers after the continuous evaporation of the solvent. The existing technology mainly achieves the mass production of ultrafine nanofibers through multiple nozzles, but this leads to another new problem, namely poor control of multiple nozzles and poor cleaning effect. Summary of the Invention

[0003] To address the aforementioned technical problems, the technical solution adopted by this invention is as follows:

[0004] According to a first aspect of this application, a spinning system based on a slit-type coaxial dual-airflow stretching airjet spinning nozzle is provided. The system includes: a slit-type coaxial dual-airflow stretching airjet spinning nozzle and a controller; wherein the slit-type coaxial dual-airflow stretching airjet spinning nozzle is connected to an externally preset air supply device and a liquid supply device, and the controller is communicatively connected to the air supply device and the liquid supply device.

[0005] The slit-type coaxial dual-airflow stretching air-jet spinning nozzle includes: a first cylindrical structure, a second cylindrical structure, and a third cylindrical structure; wherein, the second cylindrical structure is disposed inside the first cylindrical structure, and the third cylindrical structure is disposed inside the second cylindrical structure; the first cylindrical structure, the second cylindrical structure, and the third cylindrical structure are coaxially arranged.

[0006] The first end of the cavity of the third cylindrical structure is the inner gas outlet of the slit-type coaxial dual-flow stretching air-jet spinning nozzle; the first end of the cavity between the second cylindrical structure and the first cylindrical structure is the outer gas outlet of the slit-type coaxial dual-flow stretching air-jet spinning nozzle; and the first end of the cavity between the second cylindrical structure and the third cylindrical structure is the solution outlet of the slit-type coaxial dual-flow stretching air-jet spinning nozzle.

[0007] The second end of the cavity of the third cylindrical structure and the second end of the cavity between the second cylindrical structure and the first cylindrical structure are connected to the gas supply device, and the second end of the cavity between the second cylindrical structure and the third cylindrical structure is connected to the liquid supply device.

[0008] The controller is used to perform the following steps:

[0009] S100, Obtain the solution type W of the solution in the liquid supply device. now and concentration C now ;

[0010] S200, according to W now C now And the preset solution type control parameter group mapping table QT, determine W now The corresponding system control parameter group Q now = (Q) now，1 Q now，2 Q now，3 ); where Q now，1 Q represents the flow rate of the solution. now，2 The velocity of the outer gas, Q now，3 The flow rate of the inner gas; QT includes several rows, each row corresponding to a solution type of a certain concentration and the flow rates of the solution, outer gas, and inner gas corresponding to the slit-type coaxial dual-flow stretching air jet spinning nozzle when using the solution of this type for spinning.

[0011] S300, according to Q now The air supply and liquid supply devices are controlled to ensure that the flow rate of the solution at the solution outlet of the slit-type coaxial dual-airflow stretching air-jet spinning nozzle is Q. now，1 The velocity of the gas inside the outer gas outlet is Q. now，2 The gas velocity at the inner gas outlet is Q. now，3 .

[0012] The present invention has at least the following beneficial effects:

[0013] The spinning system based on a slit-type coaxial dual-airflow stretching airjet spinning nozzle of the present invention uses a slit-type coaxial dual-airflow stretching airjet spinning nozzle, which introduces an additional coaxial airflow. This causes the precursor solution to be ejected from the spinning nozzle outlet in the same direction under the action of the dual airflows. After continuous solvent evaporation, it is finally solidified into fibers. The introduction of the additional airflow triggers an early transition of the airflow state from laminar to turbulent flow, which greatly changes the "straight part" and "curved part" of fiber formation, thereby increasing the "whipping motion" of the fiber and ultimately promoting fiber stretching and refinement and solvent evaporation. As a result, the spinning quality prepared by this nozzle and the nozzle cleaning effect are better. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A perspective view of the slit-type coaxial dual-airflow stretching air-jet spinning nozzle provided in an embodiment of the present invention;

[0016] Figure 2 This is an overall structural diagram of the slit-type coaxial dual-airflow stretching air-jet spinning nozzle provided in an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram illustrating the working principle of the slit-type coaxial dual-airflow stretching air-jet spinning nozzle provided in an embodiment of the present invention.

[0018] Figure 4 A flowchart illustrating the steps performed by the controller according to an embodiment of the present invention;

[0019] Figure 5 Electron micrograph of PU provided in an embodiment of the present invention;

[0020] Figure 6 PVA electron microscope image provided in an embodiment of the present invention;

[0021] Figure 7 The PAN electron microscope image provided in the embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that, based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Furthermore, this device and / or practice the method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0024] The following section introduces a spinning system based on a slit-type coaxial dual-airflow stretching air-jet spinning nozzle. This system includes, for example, a spinning nozzle with a slit-type coaxial dual-airflow stretching air-jet spinning nozzle. Figure 1 The slit-type coaxial dual-airflow stretching airjet spinning nozzle and controller are shown; wherein, the slit-type coaxial dual-airflow stretching airjet spinning nozzle is connected to an externally preset air supply device and liquid supply device, and the controller is communicatively connected to the air supply device and liquid supply device.

[0025] In this embodiment, the gas supply device is used to provide airflow at different speeds, the liquid supply device is used to provide a solution for spinning, and the controller can control the gas flow rate of the gas supply device and the solution flow rate of the liquid supply device.

[0026] like Figure 1 As shown, the slit-type coaxial dual-airflow stretching air-jet spinning nozzle includes: a first cylindrical structure 1, a second cylindrical structure 2, and a third cylindrical structure 3; wherein, the second cylindrical structure 2 is disposed inside the first cylindrical structure 1, and the third cylindrical structure 3 is disposed inside the second cylindrical structure 2; the first cylindrical structure 1, the second cylindrical structure 2, and the third cylindrical structure 3 are coaxially arranged.

[0027] The first end of the cavity of the third cylindrical structure 3 is the inner gas outlet of the slit-type coaxial dual-flow stretching air-jet spinning nozzle. The first end of the cavity between the second cylindrical structure 2 and the first cylindrical structure 1 is the outer gas outlet of the slit-type coaxial dual-flow stretching air-jet spinning nozzle. The first end of the cavity between the second cylindrical structure 2 and the third cylindrical structure 3 is the solution outlet of the slit-type coaxial dual-flow stretching air-jet spinning nozzle.

[0028] The second end of the cavity of the third cylindrical structure 3 and the second end of the cavity between the second cylindrical structure 2 and the first cylindrical structure 1 are connected to the air supply device, and the second end of the cavity between the second cylindrical structure 2 and the third cylindrical structure 3 is connected to the liquid supply device.

[0029] Furthermore, the inner diameter of the third cylindrical structure is 0.3–2 mm, and the wall thickness is 0.05–0.1 mm; the inner diameter of the second cylindrical structure is 0.5–2.4 mm, and the wall thickness is 0.05–0.1 mm; the inner diameter of the first cylindrical structure is 0.95–4.7 mm, and the wall thickness is 0.05–0.1 mm. Within the above-mentioned size range, the slit-type coaxial dual-airflow stretching air-jet spinning nozzle can achieve a better spinning effect. Furthermore, as... Figure 2 As shown, the slit-type coaxial dual-airflow stretching air-jet spinning nozzle further includes: an inner gas storage chamber 4, an outer gas storage chamber 5, and a liquid storage chamber 6; wherein, the air inlet of the inner gas storage chamber 4 and the air inlet of the outer gas storage chamber 5 are respectively connected to the gas supply device, the air outlet of the inner gas storage chamber 4 is connected to the second end of the cavity of the third cylindrical structure 3, the air outlet of the outer gas storage chamber 4 is connected to the second end of the cavity between the second cylindrical structure 2 and the first cylindrical structure 1, the liquid inlet of the liquid storage chamber 6 is connected to the liquid storage device, and the liquid outlet of the liquid storage chamber 6 is connected to the second end of the cavity between the second cylindrical structure 2 and the third cylindrical structure 3; Figure 2 In the diagram, 7 represents the spinning process formed by solution formation, and 8 represents the airflow.

[0030] like Figure 3 As shown, the most significant difference from traditional SBS is the introduction of an additional coaxial airflow. Under the action of the dual airflows, the precursor solution is ejected from the spinning nozzle outlet in the same direction, and then solidifies into fibers after continuous solvent evaporation. The introduction of the additional airflow triggers an early transition of the airflow state from laminar to turbulent flow, which greatly changes the "straight part" and "curved part" of fiber formation, thereby increasing the "whipping motion" of the fiber and ultimately promoting fiber stretching and solvent evaporation.

[0031] Based on the aforementioned slit-type coaxial dual-airflow stretching air-jet spinning nozzle, the spinning system based on this nozzle requires, during operation, control of the outer airflow velocity, the inner airflow velocity, and the solution velocity according to the type and concentration of the solution, in order to achieve the best quality of the spun yarn. Specifically, the controller is used to execute, as follows: Figure 4 The steps shown are as follows:

[0032] S100, Obtain the solution type W of the solution in the liquid supply device. now and concentration C now .

[0033] In this embodiment, the liquid supply device contains the solution corresponding to the preparation of spinning, and the type and concentration of the solution can be obtained.

[0034] S200, according to W now C now And the preset solution type control parameter group mapping table QT, determine W now The corresponding system control parameter group Q now = (Q) now，1 Q now，2 Q now，3 ); where Q now，1 Q represents the flow rate of the solution. now，2 The velocity of the outer gas, Q now，3 The flow rate of the inner gas; QT includes several rows, each row corresponding to a solution type of a certain concentration and the flow rates of the solution, outer gas, and inner gas corresponding to the slit-type coaxial dual-flow stretching air jet spinning nozzle when using the solution of this type for spinning.

[0035] In this embodiment, QT can be determined through the following steps:

[0036] S210, Obtain each type of solvent to obtain a solvent list A = (A1, A2, ..., A... i ,…,A n ), i=1, 2,...,n; among them, A i Let be the i-th type of solvent, and n be the number of solvent types.

[0037] S220, For each solvent, set several solutions of different concentrations to obtain a list set of solutions of different concentrations TA = (TA1, TA2, ..., TA...). i ,…,TA n ); where TA i For A i List of corresponding solutions of different concentrations; TA i =(TA i，1 TA i，2 , ...,TA i，j ,…,TA i，m ), j=1,2,…,m;TA i，j For A i The corresponding j-th concentration solution, where m is A i The number of solutions of different concentrations.

[0038] S230, for TA i，j The outer gas velocity of the slit-type coaxial dual-airflow stretching jet spinning nozzle is set to the initial outer gas velocity, and the inner gas velocity is set to the initial inner gas velocity. The TA is then changed. i，j The flow rate, to obtain TAi，j Several first spindles were prepared at different flow rates.

[0039] S240, the flow rate corresponding to the best quality spinning yarn among several first spinning processes is determined as TA. i，j The corresponding target solution flow rate.

[0040] S250, TA i，j Set the target solution flow rate, and change the outer and inner gas flow rates to obtain the TA... i，j Several second spinnerets were prepared by setting the target solution flow rate and different combinations of outer and inner airflow velocities.

[0041] S260, the outer airflow velocity corresponding to the best quality spindle among several second spindles is determined as the target outer airflow velocity, and the corresponding inner airflow velocity is determined as the target inner airflow velocity; thus obtaining TA. i，j The corresponding target solution flow rate, target outer layer gas flow rate, and target inner layer gas flow rate are used to obtain QT.

[0042] Specifically, using PS as the solute and DMF as the solvent, PS solutions with concentrations of 12%, 14%, 16%, 18%, 20%, and 22% were prepared. Taking the preparation of a 20% PS solution as an example: First, a certain amount of PS particles and DMF solution were weighed according to the specified ratio. Then, DMF and PS were sequentially added to a three-necked flask, which was then placed in a magnetic water bath for thorough heating and stirring. Finally, a homogeneous and transparent PS solution was obtained. The water bath temperature was set to 80℃, and stirring was carried out for 6 hours.

[0043] During the experiment, the solution concentration was changed to 12%, 14%, 16%, 18%, 20%, and 22%, while the liquid supply rate was fixed at 12 ml / h, the inner airflow velocity was 100 m / s, the outer airflow velocity was 100 m / s, and the receiving distance was 70 cm.

[0044] During the test, the liquid supply speed was changed to 8m / s, 10m / s, 12m / s, and 14m / s, while the solution concentration was fixed at 20wt%, the inner airflow velocity was 100m / s, the outer airflow velocity was 100m / s, and the receiving distance was 70cm.

[0045] During the test, only the outer airflow velocity was changed to 20m / s, 40m / s, 60m / s, 80m / s, 100m / s, and 120m / s, while the solution concentration was fixed at 20wt%, the inner airflow velocity was 100m / s, and the receiving distance was 70cm.

[0046] The results showed that when the solution concentration was low, the solution could not form fibers and exhibited a large number of "ball-like" defects. As the solution concentration increased, solvent evaporation became more complete, the "ball-like" defect weakened, and the overall fiber morphology improved. Furthermore, at a solution concentration of 20 wt%, fibers with good morphology and relatively uniform diameter distribution were produced. However, increasing the concentration led to a series of problems, including poor fiber morphology, increased fiber diameter, yarn breakage, and the "ball-like" defect. At low liquid supply rates, the fiber diameter was fine, but the diameter distribution was uneven. With increasing liquid supply rates, the fiber diameter gradually increased, and the fiber diameter distribution became more uniform. However, excessively high liquid supply rates not only increased the fiber diameter but also caused nozzle clogging, ultimately resulting in poor fiber morphology. When the outer airflow velocity is low, it is almost impossible to spin fibers, and droplets are observed during the spinning process. As the outer airflow velocity increases, the fibers gradually take shape, and the fiber diameter and morphology are greatly improved, resulting in a better state. When the outer airflow velocity is too high, the fiber diameter begins to increase, and both filament bundling and "ball" phenomena occur.

[0047] To verify the general applicability of the spinning system based on the slit-type coaxial dual-airflow stretching jet spinning nozzle of this embodiment in the field of nonwoven fabric production, several different precursor solutions can be tried to prepare fiber membranes, such as polyvinyl alcohol (PVA) and polyacrylonitrile (PAN). Due to the different properties of each precursor solution, corresponding spinning parameters will be required for different precursor solutions.

[0048] S300, according to Q now The air supply and liquid supply devices are controlled to ensure that the flow rate of the solution at the solution outlet of the slit-type coaxial dual-airflow stretching air-jet spinning nozzle is Q. now，1 The velocity of the gas inside the outer gas outlet is Q. now，2 The gas velocity at the inner gas outlet is Q. now，3 .

[0049] The following findings were observed during the experiments conducted based on the corresponding spinning parameters: the spinning process was relatively smooth, with no droplets falling, nozzle clogging, or filament drifting; electron microscopy revealed that the fiber morphology was good, and phenomena such as filament bundling and "ball-like" formation were significantly improved; all of these conformed to the basic theory of fiber formation, namely, the formation of a Taylor cone under the action of airflow force, followed by "linear motion" and "whipping motion," accompanied by solvent evaporation during the motion, ultimately forming ultrafine fibers.

[0050] In this application, spinning experiments were conducted using the aforementioned spinning system based on a slit-type coaxial dual-airflow stretching jet spinning nozzle. The final spinning effect is as follows: Figure 5 , Figure 6 and Figure 7As shown, the final spinning effect is good.

[0051] The spinning system based on a slit-type coaxial dual-airflow stretching airjet spinning nozzle in this embodiment uses a slit-type coaxial dual-airflow stretching airjet spinning nozzle, which introduces an additional coaxial airflow. This causes the precursor solution to be ejected from the spinning nozzle outlet in the same direction under the action of the dual airflows. After continuous solvent evaporation, it eventually solidifies into fibers. The introduction of the additional airflow triggers an early transition from laminar to turbulent flow, which greatly changes the "straight part" and "curved part" of fiber formation, thereby increasing the "whipping motion" of the fiber and ultimately promoting fiber stretching and solvent evaporation. As a result, the spinning quality produced by this nozzle is better and the nozzle cleaning effect is better.

[0052] Furthermore, although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or a step may be broken down into multiple steps.

[0053] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art should also understand that various modifications can be made to the embodiments without departing from the scope and spirit of the invention.

Claims

1. A spinning system based on a slit-type coaxial double-airflow stretch gas-jet spinning nozzle, characterized in that, The system includes: a slit-type coaxial dual-airflow stretching air-jet spinning nozzle and a controller; wherein, the slit-type coaxial dual-airflow stretching air-jet spinning nozzle is connected to an externally preset air supply device and a liquid supply device, and the controller is communicatively connected to the air supply device and the liquid supply device. The air supply device is used to provide airflow at different velocities. The introduction of additional airflow triggers an early transition of the airflow state from laminar to turbulent, altering the straight and curved sections of fiber forming. The slit-type coaxial dual-airflow stretching air-jet spinning nozzle includes: a first cylindrical structure, a second cylindrical structure, and a third cylindrical structure; wherein, the second cylindrical structure is disposed inside the first cylindrical structure, and the third cylindrical structure is disposed inside the second cylindrical structure; the first cylindrical structure, the second cylindrical structure, and the third cylindrical structure are coaxially arranged. The first end of the cavity of the third cylindrical structure is the inner gas outlet of the slit-type coaxial dual-flow stretching air-jet spinning nozzle; the first end of the cavity between the second cylindrical structure and the first cylindrical structure is the outer gas outlet of the slit-type coaxial dual-flow stretching air-jet spinning nozzle; and the first end of the cavity between the second cylindrical structure and the third cylindrical structure is the solution outlet of the slit-type coaxial dual-flow stretching air-jet spinning nozzle. The second end of the cavity of the third cylindrical structure and the second end of the cavity between the second cylindrical structure and the first cylindrical structure are connected to the gas supply device, and the second end of the cavity between the second cylindrical structure and the third cylindrical structure is connected to the liquid supply device. The controller is used to perform the following steps: S100, acquiring a solution type W of a solution in a solution supply device now and a concentration C now ; S200, according to W now C now And the preset solution type control parameter group mapping table QT, determine W now The corresponding system control parameter group Q now =(Q now，1 Q now，2 Q now，3 ); where Q now，1 Q represents the flow rate of the solution. now，2 The velocity of the outer gas, Q now，3 The flow rate of the inner gas; QT includes several rows, each row corresponding to a solution type of a certain concentration and the flow rates of the solution, outer gas, and inner gas corresponding to the slit-type coaxial dual-flow stretching air jet spinning nozzle when using the solution of this type for spinning. S300, according to Q now The air supply and liquid supply devices are controlled to ensure that the flow rate of the solution at the solution outlet of the slit-type coaxial dual-airflow stretching air-jet spinning nozzle is Q. now，1 The velocity of the gas inside the outer gas outlet is Q. now，2 The gas velocity at the inner gas outlet is Q. now，3 ; The preset solution type control parameter group mapping table QT is determined through the following steps: S210, Obtain each type of solvent to obtain a solvent list A = (A1, A2, ..., A... i ,…,A n ), i=1, 2,...,n; among them, A i Let n be the i-th type of solvent, and n be the number of solvent types. S220, For each solvent, set several solutions of different concentrations to obtain a list set of solutions of different concentrations TA = (TA1, TA2, ..., TA...). i ,…,TA n ); where TA i For A i List of corresponding solutions of different concentrations; TA i =(TA i，1 TA i，2 , ...,TA i，j ,…,TA i，m ), j=1,2,…,m;TA i，j For A i The corresponding j-th concentration solution, where m is A i The corresponding number of solutions of different concentrations; S230, for TA i，j The outer gas velocity of the slit-type coaxial dual-airflow stretching jet spinning nozzle is set to the initial outer gas velocity, and the inner gas velocity is set to the initial inner gas velocity. The TA is then changed. i，j The flow rate, to obtain TA i，j Several first spinnerets prepared at different flow rates; S240, determining the flow rate corresponding to the best quality spinning of the first spinning as TA i，j corresponding target solution flow rate; S250, TA i，j Set the target solution flow rate, and change the outer and inner gas flow rates to obtain the TA... i，j Several second spinnerets were prepared using different combinations of outer and inner airflow velocities, with the target solution flow rate set. S260, the outer airflow velocity corresponding to the best quality spindle among several second spindles is determined as the target outer airflow velocity, and the corresponding inner airflow velocity is determined as the target inner airflow velocity; thus obtaining TA. i，j The corresponding target solution flow rate, target outer layer gas flow rate, and target inner layer gas flow rate are used to obtain QT.

2. The spinning system based on a slit-type coaxial dual-airflow stretching jet spinning nozzle according to claim 1, characterized in that, The inner diameter of the third cylindrical structure is 0.3–2 mm, and the wall thickness is 0.05–0.1 mm; the inner diameter of the second cylindrical structure is 0.5–2.4 mm, and the wall thickness is 0.05–0.1 mm; the inner diameter of the first cylindrical structure is 0.95–4.7 mm, and the wall thickness is 0.05–0.1 mm.

3. The slit-based coaxial dual gas flow stretch gas jet spinning nozzle based spinning system according to claim 1, wherein, The slit-type coaxial dual-airflow stretching air-jet spinning nozzle further includes: an inner gas storage chamber, an outer gas storage chamber, and a liquid storage chamber; wherein, the air inlet of the inner gas storage chamber and the air inlet of the outer gas storage chamber are respectively connected to the gas supply device, the air outlet of the inner gas storage chamber is connected to the second end of the cavity of the third cylindrical structure, the air outlet of the outer gas storage chamber is connected to the second end of the cavity between the second cylindrical structure and the first cylindrical structure, the liquid inlet of the liquid storage chamber is connected to the liquid storage device, and the liquid outlet of the liquid storage chamber is connected to the second end of the cavity between the second cylindrical structure and the third cylindrical structure.

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