Double-airflow-assisted electrostatic spinning device

Abstract

The invention relates to the field of electrostatic spinning, in particular to a double-airflow-assisted electrostatic spinning device which mainly comprises a controllable injection device, a liquid guide pipe, a solution tank, a liquid separation device, a high-voltage power supply, a gas guide pipe, an upper-layer gas hood, a lower-layer gas hood, a conductive plate, a spinning nozzle, a gas pump, a gas guide plate, a honeycomb supporting structure, a multi-stage micro-channel and a collecting device. The technical problem to be solved by the invention is to provide the airflow-assisted electrostatic spinning device which can improve the electrostatic spinning efficiency, refine nanofibers and improve the thickness uniformity of the nanofibers. A gas channel is designed through an annular reducing method, so that the effects of accelerating vortex and enhancing shearing force are achieved; a honeycomb supporting structure is designed through a porous isolation layer method, and the effects of separating a gas-liquid path and maintaining the structural strength are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrospinning, and particularly to a dual-airflow assisted electrospinning device. Background Art

[0002] The airflow-assisted electrospinning technology can be divided into 4 main types: needle-type airflow-assisted electrospinning, needleless airflow-assisted electrospinning, bubble electrospinning, and centrifugal electrospinning. Among them, bubble and centrifugal electrospinning can also be classified as needleless airflow-assisted electrospinning types, but each has its own unique characteristics.

[0003] 1. Needle-type airflow-assisted electrospinning 1.1. Forward airflow assistance The use of forward airflow is a widely applied airflow-assisted electrospinning technology. In this technology, the airflow is introduced around the spinning nozzle, and its direction is kept consistent with the direction of the polymer solution jet. The airflow exerts a hydrodynamic force on the jet in the same direction as the electric field force, thereby enhancing the stretching effect of the jet. In addition, the airflow can also improve the ventilation efficiency in the spinning area and promote the rapid volatilization of the solvent in the fluid fiber. Due to the action of the additional force, the flow rate of the polymer fluid at the spinning head increases, thereby increasing the fiber formation rate. However, an excessive airflow may interfere with the deposition stability of the fiber, causing the fiber to deviate from the predetermined trajectory under the action of the airflow and escape to the area outside the collector. Therefore, when implementing forward airflow-assisted electrospinning, it is necessary to precisely control the magnitude and direction of the airflow to ensure that the fiber can be stably deposited in the predetermined collection area, thereby obtaining high-quality fiber products.

[0004] 1.2. Vertical shear-type airflow assistance The introduction of vertical airflow is usually after the jet is formed. They produce a bending effect on the jet, prompting the jet to stretch and improving the fiber yield and quality. It has been found that due to the action of the eddy current in the pipeline, the macromolecular chains in the fiber are intertwined with each other, thereby significantly improving the mechanical properties of the nanofibers. It has also been found that the flow rate of the eddy current directly affects the fiber morphology.

[0005] 1.3. Reverse airflow assistance The reverse airflow mainly acts on the end region of the spinning, exerting a certain resistance on the fiber, thereby affecting the fiber deposition. McClure et al. have studied and pointed out that the reverse airflow can reduce the fiber deposition speed. Ambrus et al. used reverse airflow-assisted electrospinning to prepare loratadine (LOR) nanofibers. Compared with the pure LOR drug, the solubility of the LOR nanofibers increased by 26.2 times.

[0006] 2. Needleless airflow-assisted electrospinning 2.1. Co-directional airflow assistance He et al. successfully prepared PAN nanofibers by combining co-directional airflows with the pore network technique. Under the combined action of co-directional high-speed airflows and a high electric field, the yield of nanofibers was significantly increased. In addition to increasing the yield, the airflow also plays an important role in promoting the uniform dispersion of nanoparticles inside the fibers. Research shows that the co-directional airflow can enhance the fiber yield; when using a lateral airflow along a rotating path, the fiber yield decreases instead because the vertical airflow disrupts the jet and accelerates the evaporation of the solution, and at the same time, the influence of the airflow causes the fibers to be blown away; furthermore, when using a reverse airflow, the fiber yield also decreases.

[0007] 2.2. Bubble electrospinning Liu et al. introduced an airflow to generate bubbles in the solution. These bubbles changed the curvature of the solution surface, thereby reducing the critical voltage for forming jets. Under the action of a specific electric field, multiple jets are generated on the bubble surface, significantly increasing the electrospinning yield. This method effectively overcomes the low efficiency and easy clogging problems of traditional needle electrospinning. Subsequently, based on bubble electrospinning, they introduced an auxiliary electrode and a co-directional auxiliary airflow technique. By using the auxiliary electrode, the voltage was reduced, thereby improving the fiber collection efficiency. In addition, Cheng et al. adopted a conical cavity bubbling to improve the bubble electrospinning device. This improvement not only enhances the electrospinning stability but also reduces the fiber non-uniformity.

[0008] 2.3. Pneumatic electrospinning On the basis of traditional airflow-assisted electrospinning, the function of an auxiliary electrode was added. A slit-type spinneret was used. Under the guidance of the auxiliary electrode, the charge-injected polyvinyl alcohol (PVA) solution forms multiple jets on the surface of the slit spinneret. The powerful airflow prevents the jets from depositing on the nearby auxiliary electrode. The combined action of the auxiliary electrode and the airflow significantly reduces the voltage requirement of the electric field. Only 22 kV is required to make the electrospinning system operate stably. Compared with the slit spinning method without an auxiliary field, the yield of this technology is increased by 35% and there is no impact on the fiber diameter.

[0009] 2.4. Gas amplifier-assisted electrospinning The airflow-assisted electrospinning technology can also be realized through other devices, such as using the unidirectional air flow principle of an air amplifier. Chen et al. used an air amplifier to introduce the polypropylene (PP) melt jet from the suction end of the amplifier and applied a high voltage outside the air amplifier. Under the combined action of the induced electric field and the unidirectional airflow, the conical needleless nozzle generates multiple jets, and these jets are rapidly stretched and form a large number of fibers.

[0010] 2.5. Centrifugal electrospinning Centrifugal electrospinning is a unique air - flow - enhanced electrospinning technology, which is characterized in that the air flow does not come from the outside, but is achieved through the rotation of the spinning head. During the rotation, a passive air flow is formed around the spinning head, whose direction is perpendicular to the spinning direction, causing the jet to bend, thereby enhancing the stretching effect and promoting the rapid volatilization of the solvent. Summary of the Invention

[0011] In view of the above research on the prior art, it is found that the air - flow - assisted electrospinning technology still has the following deficiencies: Limited production efficiency: Although the air - flow assistance increases the output, compared with industrial - scale mass production, the efficiency still needs to be improved.

[0012] Difficult to control fiber orientation: The air flow may interfere with the fiber orientation, making it difficult to precisely control the arrangement and structure of the fibers.

[0013] Uneven fiber diameter: The air flow may cause uneven distribution of the fiber diameter, affecting the uniformity and consistency of the fibers.

[0014] In summary, although the air - flow - assisted electrospinning technology has many advantages, these defects and deficiencies still need to be solved in practical applications. This patent will optimize the above - mentioned defects.

[0015] To achieve the above - mentioned purposes, the present invention is realized through the following technical solutions: a dual - air - flow - assisted electrospinning device, including a controllable injection device, a liquid conduit, a liquid distribution device, a high - voltage power supply, a lower air hood, an upper air hood, a conductive plate, a spinning nozzle, a swivel joint array, a lower - layer gas conduit, an auxiliary pressure - regulating valve, an auxiliary air pump, an upper - layer gas conduit, a pressure - regulating valve, an air pump, a receiving device, a flow - guiding plate, a honeycomb support structure, and a multi - stage micro - channel.

[0016] Preferably, the controllable injection device is used to precisely control the injection rate of the spinning solution. The liquid outlet of the controllable injection device is connected to the liquid distribution device through a liquid conduit, used to transport the solution into the solution tank inside the liquid distribution device, and then transmitted to the spinning nozzle through a tree - shaped multi - stage micro - channel. The first - stage main channel of the tree - shaped multi - stage micro - channel is divided into two secondary channels, and the secondary channels are further divided into finer channels until all nozzles are covered. The flow - channel size of each - level branch is designed according to the flow - resistance balance formula; A conductive plate is connected below the solution tank, the swivel joint is connected to the conductive plate, the spinning nozzle passes through the through - hole on the conductive plate, the outer circle of the conductive plate is connected with the upper air hood, and the spinning nozzle passes through the coaxial arc - shaped through - hole at the bottom of the upper air hood. The lower air hood is arranged at the bottom of the upper air hood, and the bottom of the lower air hood is flush with the tip of the spinning nozzle; The upper air hood (6) is an inverted frustum structure with a larger top and a smaller bottom, and an annular gas channel is formed between the upper air hood (6) and the middle honeycomb support structure (18). Four flow guiding plates (17) are distributed inside the liquid separation device, and the flow guiding plates intersect and are spirally distributed along the inner wall of the upper air hood. The diameter shrinkage ratio of the bottom to the top of the upper air hood is 1:1.5; An air pump and an auxiliary air pump. The air outlet of the air pump is connected to a pressure regulating valve. The pressure regulating valve is connected to an upper gas conduit that tangentially enters the rear annular channel, causing the gas to be transmitted downward in a spiral shape to form a stable eddy current. An upper air storage chamber is formed between the upper air hood and the conductive plate. The upper gas conduit is used to supply gas to the upper air storage chamber. The air outlet of the auxiliary air pump is connected to an auxiliary pressure regulating valve. The auxiliary pressure regulating valve is connected to a lower gas conduit. A lower air storage chamber is formed between the lower air hood and the upper air hood. The lower gas conduit is used to supply gas to the lower air storage chamber; A receiving device, which is located directly below the spinning nozzle and perpendicular to the axial direction of the spinning nozzle. The conductive plate and the receiving device are respectively connected to the positive and negative electrodes of a high-voltage power supply.

[0017] Preferably, the controllable injection device is used to precisely control the injection rate of the spinning solution to ensure that the solution can be evenly transported to the spinning nozzle through the liquid conduit; the liquid conduit connects the controllable injection device and the liquid separation device and is responsible for transporting the spinning solution to the solution tank.

[0018] Preferably, the liquid separation device is used to store the spinning solution to ensure a stable supply of the solution during the entire spinning process; the liquid separation device is used to evenly distribute the solution to multiple spinning nozzles to improve production efficiency.

[0019] Preferably, the lower gas conduit and the upper gas conduit are respectively connected to the auxiliary air pump and the air pump through pipes. The upper air hood and the lower air hood are used to transport gas to assist in the formation and stretching of fibers.

[0020] Preferably, the gas transported by the upper gas conduit and the lower gas conduit in the upper air hood and the lower air hood forms an air flow in the air hood to assist in the stretching and orientation of fibers during the electrospinning process.

[0021] Preferably, the conductive plate is used to form a stable electric field to ensure the uniform distribution of fibers during the spinning process.

[0022] Preferably, the spinning nozzle is used for the solution to be ejected through the nozzle to form fibers under the combined action of a high-voltage electric field and an air flow.

[0023] Preferably, the gas flow guiding plate is arranged in the inverted frustum-shaped upper air hood, and the gas forms a stable air flow downward along the flow guiding plate after entering from the air inlet.

[0024] Preferably, the honeycomb support structure separates the liquid microchannel and the gas annular channel through internal support columns, and the support columns are arranged in a honeycomb shape to ensure structural strength while minimizing air flow resistance.

[0025] Preferably, the multi-stage microchannel adopts a tree-like multi-stage fractal structure, and the channel width gradually decreases. Through laser etching or micro-milling, the flow rate difference of 5 nozzles is ensured to be <5%.

[0026] Working principle: The controllable injection device is used to precisely control the injection rate of the spinning solution to ensure that the solution can be evenly transported to the spinning nozzle through the liquid conduit; the liquid conduit connects the controllable injection device and the liquid distribution device, and is responsible for transporting the spinning solution into the solution tank; the solution tank stores the spinning solution to ensure a stable supply of the solution during the entire spinning process; the liquid distribution device is used to evenly distribute the solution to multiple spinning nozzles to improve production efficiency; the high-voltage power supply provides a high voltage to charge the solution at the spinning nozzle to form an electric field to promote the formation of fibers; the gas conduit: connects the air pump and the upper air hood and the lower air hood, and is used to transport gas to assist in the formation and stretching of fibers; the gas in the upper air hood and the lower air hood forms an air flow through the gas transported by the gas conduit to assist in the stretching and orientation of fibers during the electrospinning process; the conductive plate is used to form a stable electric field to ensure the uniform distribution of fibers during the spinning process; the spinning nozzle is where the solution is ejected through the nozzle and forms fibers under the combined action of a high-voltage electric field and an air flow; the air pump provides a stable air flow and transports it to the upper air hood and the lower air hood through the gas conduit to assist in the formation of fibers; the gas deflector is arranged in the frustum-shaped upper air hood, and the gas forms a stable downward air flow along the deflector after entering from the air inlet; the honeycomb support structure separates the liquid microchannel and the gas annular channel through internal support columns, and the support columns are arranged in a honeycomb shape (porosity > 60%) to ensure structural strength while minimizing air flow resistance; the multi-stage microchannel adopts a tree-like fractal structure (3-level branches), and the channel width gradually decreases. Through laser etching or micro-milling, the flow rate difference of 5 nozzles is ensured to be <5%; the collection device is a rotating drum with aluminum foil attached to it, which is used to collect the formed fibers to ensure that the fibers can be evenly deposited on the collection surface.

[0027] The controllable injection device transports the solution into the solution tank through a liquid conduit, and then transfers it to the spinning nozzle level by level through a dendritic multi-stage microchannel. The first-stage main channel is divided into two secondary channels, and the secondary channels are further divided into finer channels until all nozzles are covered. The flow channel size of each stage of branches is designed according to the flow resistance balance formula. A conductive plate is connected below, and the spinning nozzle passes through the through hole on the conductive plate. The conductive plate applies an upward pre-tightening force to the spinning nozzle and is fixed on the liquid distribution device. The spinning nozzle passes through the coaxial arc-shaped through hole at the bottom of the upper air hood. The lower air hood is located below the upper air hood, and its bottom is flush with the tip of the needle. The upper air hood is an inverted frustum structure with a large top and a small bottom, forming an annular gas channel with the honeycomb support structure in the middle, and four flow guiding plates are arranged inside. A lower air storage chamber is formed between the lower air hood and the upper air hood; the air pump is connected to the pressure regulating valve, and the pressure regulating valve is connected to the upper gas conduit and tangentially enters the rear annular channel, so that the gas is transmitted downward in a spiral shape to form a stable vortex; the auxiliary air pump is connected to the auxiliary pressure regulating valve, and the auxiliary pressure regulating valve is connected to the lower gas conduit to supply gas evenly to the lower air storage chamber; there are four flow guiding plates, which intersect and spiral around along the inner wall of the air cavity. Because an annular diameter reduction section (diameter reduction ratio 1:1.5) is arranged above the nozzle outlet, the Venturi effect is used to accelerate the rotating air flow and enhance the shearing and stretching of the liquid jet. Finally, the gas is discharged from the coaxial air outlet on the outer layer of the nozzle; the receiving device is located directly below the spinning nozzle and perpendicular to the axial direction of the spinning nozzle; the positive and negative poles of the high-voltage power supply are respectively connected to the curved electrode plate and the receiving device.

[0028] The present invention provides a dual-airflow-assisted electrospinning device. It has the following beneficial effects: By designing the spiral-arranged flow guiding plates through the inverted table spiral arrangement and the blade inclined flow guiding, the effect of generating a stable vortex is achieved; by designing the fractal microchannel through the method of tree-shaped three-stage branching with gradually decreasing width, the effect of evenly distributing the liquid to each nozzle is achieved; by designing the gas channel through the method of annular diameter reduction, the effect of accelerating the vortex and enhancing the shearing force is achieved; by designing the honeycomb support structure through the method of porous isolation layer, the effect of separating the gas-liquid path and maintaining the structural strength is achieved. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the overall device of the airflow-assisted electrospinning of the present invention; Figure 2 It is a side view of the upper and lower air hoods of the present invention; Figure 3 It is a schematic diagram of the internal flow guiding plate structure of the upper air hood of the present invention; Figure 4 It is a schematic diagram of the air inlet orientation of the upper air hood of the present invention.

[0030] Among them, 1. a controllable injection device; 2. a liquid conduit; 3. a liquid distribution device; 4. a high-voltage power supply; 5. a lower gas hood; 6. an upper gas hood; 7. a conductive plate; 8. a spinning nozzle; 9. an adapter array; 10. a lower gas conduit; 11. an auxiliary pressure regulating valve; 12. an auxiliary air pump; 13. an upper gas conduit; 14. a pressure regulating valve; 15. an air pump; 16. a receiving device; 17. a flow guiding plate; 18. a honeycomb support structure; 19. a multi-stage microchannel. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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. Embodiment

[0032] As Figures 1-4 shown, the embodiment of the present invention provides a dual-airflow assisted electrospinning device, including: the controllable injection device 1 transports the solution into the solution tank through the liquid conduit 2, and then conveys it to the spinning nozzle level by level through the tree-shaped multi-stage microchannel 19. The first-level main channel is divided into two secondary channels, and the secondary channels are further divided into finer channels until all the nozzles are covered. The flow channel size of each level of branch is designed according to the flow resistance balance formula. The conductive plate 7 is connected below the solution tank, the adapter 9 is connected to the conductive plate 7, and the spinning nozzle 8 passes through the through hole on the conductive plate 7. The conductive plate 7 applies an upward pre-tightening force to the spinning nozzle 8 and is fixed on the liquid distribution device 3. The spinning nozzle 8 passes through the coaxial arc-shaped through hole at the bottom of the upper gas hood 6. The lower gas hood 5 is located below the upper gas hood 6, and its bottom is flush with the tip of the needle. The upper gas hood 6 is an inverted frustum structure with a large upper part and a small lower part, and forms an annular gas channel with the middle honeycomb support structure 18. There are six flow guiding plates 17 inside. There are six flow guiding plates 17, which intersect along the inner wall of the gas chamber and are helically wound. Because an annular diameter reduction section (diameter reduction ratio 1:1.5) is provided above the nozzle outlet, the shear stretching of the liquid jet is enhanced, and finally the gas is discharged from the coaxial air outlet on the outer layer of the nozzle. A lower gas storage chamber is formed between the lower gas hood 5 and the upper gas hood 6; the air pump 15 is connected to the pressure regulating valve 14, and the pressure regulating valve 14 is connected to the upper gas conduit 13 to supply gas evenly to the upper gas storage chamber; the auxiliary air pump 12 is connected to the auxiliary pressure regulating valve 11, and the auxiliary pressure regulating valve 11 is connected to the lower gas conduit 10 to supply gas evenly to the lower gas storage chamber; the receiving device 16 is located directly below the spinning nozzle 8 and is perpendicular to the axial direction of the spinning nozzle 8. The positive and negative electrodes of the high-voltage power supply 4 are respectively connected to the conductive plate 7 and the receiving device 16.

[0033] The spinning needle head 8 is provided with five needles. The needle length is 7 mm, and the size is a 26G standard dispensing needle (inner diameter 0.23 mm, outer diameter 0.45 mm). The material is selected as stainless steel. The needle array is arranged in an arc shape. The distance between adjacent needles is 17.5 mm. The middle needle protrudes 8 mm more than the outermost needle, and the curvature radius of each point of the needle tip is equal.

[0034] The diameter range of the liquid inlet is set as W1 = 4 mm, the depth of the liquid inlet channel is 5 mm, the length of the solution tank is 40 - 50 mm, and the width is set as 20 mm. The bottom of the solution tank is connected to a multi-stage shunt microchannel through a primary main channel. The first stage evenly distributes the solution from the liquid storage tank to the left and right branches, keeping the channel depth unchanged and the width becoming W1 / √2 ≈ 2.8 mm. The length of the second-stage solution tank is set as 70 - 75 mm, and the width is still 2.0 mm. The third stage evenly distributes the solution in the second stage to the following five nozzles through five cuboid channels with a square cross-section. According to the flow resistance formula R∝w3*d / L, if the flow channel length increases by 30%, the width needs to increase by 10%. Therefore, according to this ratio, the middle channel is the thickest, followed by the second and fourth channels, and finally the two outermost channels.

[0035] The upper air inlet obliquely cuts into the rear of the annular channel, so that the gas can form a stable vortex under the action of the deflector. The upper air hood is a frustum structure with a larger upper diameter and a smaller lower diameter. The lower diameter is set as 75 mm. According to the Venturi constriction section principle, the upper diameter is set as 115 mm, and the height of the frustum is set as 70 - 80 mm. In the middle, the liquid microchannel and the gas channel are separated by internal support columns, and the support columns are arranged in a honeycomb shape (porosity > 60%) to ensure the structural strength while minimizing the air flow resistance. There are four deflectors, which are evenly distributed along the circumference inside the upper air hood, and one deflector is set every 90 degrees. The thickness of the plate is set as 1 - 2 mm, and the length of the plate decreases gradually, which are 25 mm, 20 mm, 15 mm, and 10 mm respectively, and form an inclined angle of 15° downward tangentially with the inner wall of the air cavity. The root of the plate keeps a safety distance of 3 - 5 mm from the liquid flow channel. There are two upper and lower air inlets inside the annular gas channel, and the diameter range of the air inlets is set as 4 mm. Because the gas enters the gas channel tangentially, the depth of the short inner channel is set as 5 mm.

[0036] The length of the bottom air hole of the upper air hood is set as 6 mm. The air hole consists of two parts: a frustum and a cylinder. The ratio of the upper and lower diameters of the frustum is also set as 1.5:1 according to the Venturi constriction section principle. The upper radius is set as 3 mm, the lower radius and the cylinder have the same diameter and are set as 2 mm, and the length of the cylinder is 4 mm. Among them, the slot angle of the air outlet of the lower air hood is set as 50°, the slot width of the air outlet of the lower air hood is set as 0.5 mm, and the distance from the air outlet to the needle tip is ≥ 2 mm.

[0037] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Dual-airflow-assisted electrospinning device, characterized in that: Comprising: A controllable injection device (1) for precisely controlling the injection rate of the spinning solution. The liquid outlet of the controllable injection device (1) is connected to a liquid distribution device (3) through a liquid conduit (2) for delivering the solution into the solution tank within the liquid distribution device (3), and then conveyed to a spinning nozzle (8) through a dendritic multi-stage microchannel (19). The first-stage main channel of the dendritic multi-stage microchannel (19) is divided into two secondary channels, and the secondary channels are further divided into finer channels until all nozzles are covered. The flow channel dimensions of each stage of branches are designed according to the flow resistance balance formula; A conductive plate (7) is connected below the solution tank. A connector (9) is connected to the conductive plate (7). The spinning nozzle (8) passes through the through-hole on the conductive plate (7). The conductive plate (7) applies an upward pre-tightening force to the spinning nozzle (8) and is fixed on the liquid distribution device (3); an upper air hood (6) is connected to the outer circle of the spinning nozzle (8), and the spinning nozzle (8) passes through the coaxial arc-shaped through-hole at the bottom of the upper air hood (6). A lower air hood (5) is arranged at the bottom of the upper air hood (6), and the bottom of the lower air hood (5) is flush with the tip of the spinning nozzle (8); The upper air hood (6) is an inverted frustum structure with a larger top and a smaller bottom, and an annular gas channel is formed between the upper air hood (6) and the intermediate honeycomb support structure (18). Four flow guiding plates (17) are distributively arranged inside the liquid distribution device (3), and the flow guiding plates (17) intersect and are spirally distributed along the inner wall of the upper air hood (6). The diameter shrinkage ratio of the bottom to the top of the upper air hood (6) is 1:1.5; An air pump (15) and an auxiliary air pump (12). The air outlet of the air pump (15) is connected to a pressure regulating valve (14). The pressure regulating valve (14) is connected to an upper gas conduit (13) that tangentially enters the rear annular channel, enabling the gas to be transmitted downward in a spiral shape to form a stable vortex. An upper gas storage chamber is formed between the upper air hood (6) and the conductive plate (7). The upper gas conduit (13) is used to supply gas to the upper gas storage chamber. The air outlet of the auxiliary air pump (12) is connected to an auxiliary pressure regulating valve (11). The auxiliary pressure regulating valve (11) is connected to a lower gas conduit (10). A lower gas storage chamber is formed between the lower air hood (5) and the upper air hood (6). The lower gas conduit (10) is used to supply gas to the lower gas storage chamber; A receiving device (16) is located directly below the spinning nozzle (8) and perpendicular to the axis of the spinning nozzle (8). The conductive plate (7) and the receiving device (16) are respectively connected to the positive and negative electrodes of a high-voltage power supply (4).

2. The dual-airflow-assisted electrospinning device according to claim 1, wherein: The controllable injection device (1) is used to precisely control the injection rate of the spinning solution to ensure that the solution can be evenly conveyed to the spinning nozzle (8) through the liquid conduit (2); the liquid conduit connects the controllable injection device and the liquid distribution device and is responsible for conveying the spinning solution into the solution tank.

3. The dual-airflow-assisted electrospinning device according to claim 1, wherein: The liquid distribution device (3) is used to store the spinning solution to ensure a stable supply of the solution throughout the spinning process; the liquid distribution device (3) is used to evenly distribute the solution to multiple spinning nozzles (8) to improve production efficiency.

4. The dual-airflow-assisted electrospinning device according to claim 1, wherein: The lower gas conduit (10) and the upper gas conduit (13) are respectively connected with an auxiliary air pump (12) and an air pump (15) through pipelines. The upper gas hood (6) and the lower gas hood (5) are used to convey gas to assist in the formation and stretching of fibers.

5. The dual-airflow-assisted electrospinning device according to claim 1, wherein: The gas conveyed by the upper gas hood (6) and the lower gas hood (5) through the lower gas conduit (10) and the upper gas conduit (13) forms an air current in the gas hood, assisting in the stretching and orientation of fibers during the electrospinning process.

6. The dual-airflow-assisted electrospinning device according to claim 1, wherein: The conductive plate (7) is used to form a stable electric field to ensure the uniform distribution of fibers during the spinning process.

7. The dual-airflow-assisted electrospinning device according to claim 1, characterized in that: The spinning nozzle (8) is used for the solution to be ejected through the nozzle, and fibers are formed under the combined action of a high-voltage electric field and an air current.

8. The dual-airflow-assisted electrospinning device according to claim 1, characterized in that: The gas deflector (17) is arranged in the frustum-shaped upper gas hood (6). After the gas enters from the air inlet, a stable air current flowing downward along the deflector (17) is formed.

9. The dual-airflow-assisted electrospinning device according to claim 1, wherein: The honeycomb support structure (18) separates the liquid microchannel (19) and the gas annular channel through internal support columns. The support columns are arranged in a honeycomb shape to ensure the structural strength while minimizing the air flow resistance.

10. The dual-airflow-assisted electrospinning device according to claim 1, characterized in that: The multi-stage microchannel (19) adopts a tree-shaped multi-stage fractal structure, and the channel width decreases gradually. Through laser etching or micro-milling, it is ensured that the flow rate difference of 5 nozzles is <5%.

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