A device for preparing nanofiber filter materials

Abstract

This utility model relates to a device for preparing nanofiber filter materials, comprising: a spinning mechanism, which includes: a liquid storage tank, a liquid supply pump connected to the outlet of the liquid storage tank, and a liquid supply nozzle connected to the outlet of the liquid supply pump, wherein the inlet of the liquid supply nozzle is connected to the outlet of the liquid supply pump through a first corrugated pipe, and the axis of the liquid supply nozzle extends vertically; a stretching mechanism, which includes: an air pump, an air jet head connected to the outlet of the air pump, wherein the inlet of the air jet head is connected to the outlet of the air pump through a second corrugated pipe, and the axis of the air jet head extends horizontally; and an adjusting mechanism, which includes: a driving component and a support. Through the above-mentioned configuration, this utility model can improve airflow control accuracy, expand the effective spinning width, and optimize the electrostatic spinning reception effect.

Description

Technical Field

[0001] This utility model relates to the field of electrospinning, and in particular to a device for preparing nanofiber filter materials. Background Technology

[0002] Electrospinning technology involves the accumulation and repulsion of surface charges on a solution or melt under the influence of an electrostatic field, forming a Taylor cone that is then ejected as an extremely fine jet. This jet is continuously stretched in the electrostatic field, while the solvent evaporates or the melt solidifies, ultimately forming nanoscale fibers. Air-jet spinning, on the other hand, uses a high-speed, high-pressure airflow to jet and stretch the spinning solution or melt. Under the continuous and powerful action of the airflow, the spinning solution or melt is continuously stretched and refined, eventually forming fibers with diameters on the micrometer scale. Because the fibers form and move at high speed in the high-speed airflow field during air-jet spinning, their flight trajectories are highly random and dispersed, resulting in low efficiency in the directional and orderly deposition on the receiving device. A large number of fibers fail to effectively deposit on the receiving net and easily float and disperse into the surrounding production environment. These micrometer-sized fibers suspended in the air not only cause serious waste of raw materials but can also be inhaled and harm the human body. Therefore, electrospinning has been widely adopted.

[0003] Traditional electrospinning technology, in single-needle spinning mode, produces an extremely limited amount of fiber per unit time, resulting in low electrospinning output that is difficult to meet the needs of large-scale production. The spinning reception effect is limited, forming a fiber "surface" or "film" with a small coverage area and a dense structure. The multi-needle parallel arrangement scheme adopted to increase output will cause mutual interference between the electric fields generated between the needles, resulting in disordered spinning jet paths and uneven stretching. Ultimately, this will cause a significant decrease in the uniformity of the deposited fiber layer, which will seriously affect the consistency of product performance. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problems of low output in the single-needle spinning mode and disordered spinning jet path and uneven stretching caused by the parallel arrangement of multiple needles in the existing electrospinning technology, thereby providing a device for preparing nanofiber filter materials.

[0005] To solve the above-mentioned technical problems, this utility model provides a device for preparing nanofiber filter materials, comprising:

[0006] A spinning mechanism includes: a liquid storage tank, a liquid supply pump connected to the output port of the liquid storage tank, and a liquid supply nozzle connected to the output port of the liquid supply pump. The input port of the liquid supply nozzle is connected to the output port of the liquid supply pump through a first corrugated pipe, and the axis of the liquid supply nozzle extends in a vertical direction.

[0007] A stretching mechanism includes: an air pump, a jet head connected to the output port of the air pump, the input port of the jet head being connected to the output port of the air pump via a second bellows, and the axis of the jet head extending in a horizontal direction.

[0008] The adjustment mechanism includes a drive assembly and a support, wherein the drive assembly is used to drive the support to move in a horizontal direction, and the first bellows and the second bellows are both connected to the support.

[0009] In one embodiment of this utility model, there are multiple preparation devices, which are spaced apart along the first horizontal direction and the second horizontal direction, and a control valve is provided between the air pump and the second bellows.

[0010] In one embodiment of the present invention, the driving assembly includes: a driving motor, a first gear fixedly connected to the output end of the driving motor, a second gear meshing with the first gear, a driving screw fixedly connected to the second gear, and a screw sleeve adapted to the driving screw, wherein the bracket is connected to the screw sleeve.

[0011] In one embodiment of this utility model, a first base is also included. The liquid storage tank, the liquid supply pump and the adjustment mechanism are all disposed on the first base. The first base is provided with a fixing frame, and the drive motor is disposed in the fixing frame.

[0012] In one embodiment of the present invention, a second base and a collecting plate are further included. The tensioning mechanism is disposed on the second base, which is disposed on one side of the first base. The collecting plate is disposed on the output path of the liquid supply nozzle and the jet nozzle.

[0013] In one embodiment of this utility model, the fixed frame is provided with supports at both ends, and the two ends of the drive screw are rotatably connected to the fixed frame through the supports. A guide rod is provided between the supports at both ends, and the guide rod is movably inserted through the screw sleeve.

[0014] In one embodiment of this utility model, a support rod is connected to one side of the lead screw sleeve, and the end of the support rod is connected to the bracket.

[0015] In one embodiment of the present invention, the fixing frame is provided with a fixing seat, the fixing seat is embedded with a guide sleeve, and the support rod slides through the guide sleeve.

[0016] In one embodiment of this utility model, the axes of the liquid supply nozzle and the air jet nozzle are located in the same vertical plane.

[0017] In one embodiment of this utility model, the liquid supply nozzle and the collection plate are respectively connected to a positive power supply and a negative power supply.

[0018] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0019] The present invention relates to a device for preparing nanofiber filter materials.

[0020] 1. By implementing directional airflow intervention through precise positioning, the accuracy of airflow control is significantly improved;

[0021] 2. By using an adjustable airflow assist system with opposing angles, the electrospinning receiving effect is optimized, resulting in a wider fiber deposition area and a better fluffiness.

[0022] 3. By adopting non-uniform array arrangement technology, the effective spinning width is expanded. Through the spatial misalignment between spinning units, the electric field interference between liquid supply nozzles is significantly reduced, making spinning smoother and presenting a more uniform and wider nanofiber membrane. Attached Figure Description

[0023] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the preparation device of this utility model;

[0025] Figure 2 This is a utility model Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 This is a schematic diagram of the structure of the drive component of this utility model;

[0027] Figure 4 This is a partial cross-sectional view of the bellows of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of multiple preparation devices of this utility model.

[0029] Explanation of reference numerals in the accompanying drawings: 1. Air pump; 2. Control valve; 3. Second bellows; 4. Liquid storage tank; 5. Liquid supply pump; 6. Support frame; 7. First bellows; 8. Bracket; 9. Air jet head; 10. Liquid supply nozzle; 11. Fiber to be prepared; 12. Collection plate; 13. First base; 14. Second base; 15. Support rod; 16. Drive screw; 17. Guide rod; 18. Screw sleeve; 19. Fixing frame; 20. Second gear; 21. First gear; 22. Drive motor. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0031] Example

[0032] Reference Figures 1-5 As shown, the apparatus for preparing nanofiber filter materials according to this invention includes:

[0033] A spinning mechanism includes: a liquid storage tank 4, a liquid supply pump 5 connected to the output port of the liquid storage tank 4, and a liquid supply nozzle 10 connected to the output port of the liquid supply pump 5. The input port of the liquid supply nozzle 10 is connected to the output port of the liquid supply pump 5 through a first corrugated pipe 7, and the axis of the liquid supply nozzle 10 extends in the vertical direction.

[0034] A stretching mechanism includes: an air pump 1, a jet head 9 connected to the output port of the air pump 1, the input port of the jet head 9 being connected to the output port of the air pump 1 through a second bellows 3, and the axis of the jet head 9 extending in a horizontal direction.

[0035] The adjustment mechanism includes a drive assembly and a bracket 8. The drive assembly is used to drive the bracket 8 to move in a horizontal direction. The first bellows 7 and the second bellows 3 are both connected to the bracket 8.

[0036] The present invention discloses a device for preparing nanofiber filter materials. The spinning solution in the storage tank 4 is pressurized by the supply pump 5 and then transported to the supply nozzle 10 through the first corrugated pipe 7. Initial droplets are formed at the nozzle outlet. Under the influence of gravity and an electrostatic field, the droplets extend into initial fibers. Compressed air generated by the air pump 1 enters the air jet head 9 through the second corrugated pipe 3, forming a horizontal and uniform airflow field. This airflow field acts on the initial fibers 11 during their descent, generating a lateral tensile force that reduces the diameter and increases the length of the fibers 11. The adjustment mechanism drives the support through the drive assembly. 8. Horizontal movement synchronously adjusts the horizontal position of the liquid supply nozzle 10 and the air jet nozzle 9, thereby changing the spinneret position. When there are multiple spinning mechanisms, they are staggered. The distance between different spinning mechanisms can be controlled by the adjustment mechanism, expanding the effective spinning width. Multiple preparation devices are arranged at preset intervals along the first horizontal direction (left-right direction) and the second horizontal direction (front-back direction), realizing the planar expansion and continuity of the spinneret position. Through the staggering between spinning mechanisms, the electric field interference between nozzles is significantly reduced, making spinning smoother and presenting a more uniform and wider nanofiber membrane.

[0037] Reference Figure 5As shown, there are multiple preparation devices, which are spaced apart along the first and second horizontal directions. A control valve 2 is provided between the air pump 1 and the second bellows 3. When the position of the liquid supply nozzle 10 is adjusted, its position relative to the jet nozzle 9 changes accordingly. The control valve 2 can adjust the airflow intensity of the jet nozzle 9 to adapt to liquid supply nozzles 10 at different distances, ensuring the stability of the formed filament specifications. In some embodiments, a position sensor, including contact sensors or proximity sensors, is provided between the liquid supply nozzle 10 and the jet nozzle 9.

[0038] Reference Figure 3 As shown, the drive assembly includes: a drive motor 22, a first gear 21 fixedly connected to the output end of the drive motor 22, a second gear 20 meshing with the first gear 21, a drive screw 16 fixedly connected to the second gear 20, and a screw sleeve 18 adapted to the drive screw 16. The bracket 8 is connected to the screw sleeve 18. When it is necessary to synchronously adjust the horizontal position of the liquid supply nozzle 10 and the air jet nozzle 9, the motor output shaft rotates and drives the first gear 21 to rotate. The first gear 21 meshes with the second gear 20, transmitting torque to the drive screw 16, causing the screw to rotate around its own axis. Since the screw sleeve 18 is constrained by the guide rod 17 and cannot rotate, the screw sleeve 18 converts the rotational motion of the screw into horizontal linear motion along the screw axis, thereby driving the bracket 8 and the liquid supply nozzle 10 and air jet nozzle 9 fixed on the bracket 8 to move synchronously.

[0039] Reference Figure 1 As shown, the system also includes a first base 13, on which the liquid storage tank 4, the liquid supply pump 5, and the adjustment mechanism are all disposed. The first base 13 is equipped with a fixing frame 19, and the drive motor 22 is housed within the fixing frame 19. The first base 13 provides stable support for the upper components and has a large size and weight. Through its buffering effect, it effectively absorbs and reduces the impact of vibrations from the liquid supply pump 5 and the drive motor 22 during the spinning process, thus reducing the impact on spinning accuracy. The fixing frame 19 encapsulates the drive motor 22 internally. On the one hand, the frame structure restricts the radial displacement of the drive motor 22, ensuring the stability of gear meshing; on the other hand, the combination of shock-absorbing components reduces the noise and vibration of the drive motor 22, improving the operating environment. The liquid supply pump 5 is mounted on the first base 13 via a support frame 6.

[0040] Reference Figure 1As shown, the system also includes a second base 14 and a collecting plate. The stretching mechanism is disposed on the second base 14, which is located on one side of the first base 13. The collecting plate is disposed on the output path of the liquid supply nozzle 10 and the air jet nozzle 9. The second base 14 can be rigidly connected to the first base 13, so that the stretching mechanism and the spinning mechanism form a unified whole. The initial fibers ejected from the liquid supply nozzle 10 move downward under the action of gravity and electrostatic field. The horizontal airflow ejected from the air jet nozzle 9 intersects with the fibers in the upper middle part of the fiber falling path, generating a lateral stretching force on the fibers, causing the fibers to continuously refine during the falling process and shift towards the collecting plate. The collecting plate serves as a deposition carrier for the fibers, and its horizontal arrangement ensures uniform fiber stacking and guarantees the stability of the electric field during subsequent electrostatic collection. After stretching and curing, the fibers form a continuous nanofiber film on the surface of the collecting plate, and the film thickness is controlled by the deposition time or the liquid supply flow rate.

[0041] Reference Figure 3 As shown, the fixed frame 19 has supports at both ends, and the two ends of the drive screw 16 are rotatably connected to the fixed frame 19 through the supports. A guide rod 17 is provided between the supports at both ends, and the guide rod 17 is movably inserted through the screw sleeve 18. When the drive screw 16 rotates under the drive of the drive motor 22, its two ends are radially positioned and axially limited through the supports. The guide rod 17 is arranged parallel to the drive screw 16. When the screw sleeve 18 moves along the screw axial direction, the guide rod 17 restricts the rotational freedom of the screw sleeve 18, preventing the screw sleeve 18 from tilting and rotating due to unilateral force, thus ensuring the smoothness of the movement.

[0042] A support rod 15 is connected to one side of the lead screw sleeve 18, and the end of the support rod 15 is connected to the bracket 8. When the lead screw sleeve 18 moves axially along the drive lead screw 16, it transmits the horizontal driving force to the support rod 15. The support rod 15, as a rigid connecting member, transmits the force and displacement synchronously to the bracket 8. Since both ends of the support rod 15 are bidirectionally positioned, it ensures that there is no relative rotation between the lead screw sleeve 18 and the bracket 8, avoiding circumferential swaying of the nozzle during movement.

[0043] The fixing frame 19 is provided with a fixing seat, and a guide sleeve is embedded in the fixing seat. The support rod 15 slides through the guide sleeve. When the support rod 15 moves horizontally under the drive of the lead screw sleeve 18, the part of it passing through the guide sleeve is radially constrained by the inner hole of the guide sleeve. The guide sleeve is rigidly connected to the fixing frame 19 through the fixing seat, forming multi-point support for the support rod 15 and increasing the structural strength of the support rod 15. The guide sleeve contains lubricating oil, which forms an oil film on the mating surface through frictional heat and capillary action, reducing the coefficient of friction and reducing wear.

[0044] The axes of the liquid supply nozzle 10 and the air jet nozzle 9 are located in the same vertical plane. After the spinning solution is sprayed from the liquid supply nozzle 10, an initial fiber flow is formed in the vertical direction. Since the axes of the liquid supply nozzle 10 and the air jet nozzle 9 are located in the same vertical plane, the horizontal airflow ejected from the air jet nozzle 9 can act on the central region of the fiber flow, avoiding fiber trajectory deviation caused by lateral airflow components. The tensile force of the airflow on the fiber and the fiber axis form a resultant force in this vertical plane, causing the fiber to bend and thin within the predetermined plane. If the axes of the two are not in the same vertical plane, the airflow will generate lateral components on the fiber, causing the fiber to deviate from the target deposition area, and the tensile force distribution will be uneven, easily leading to fiber breakage or diameter fluctuations.

[0045] The liquid supply nozzle 10 and the collection plate 12 are respectively connected to a positive power supply and a negative power supply. After the electrostatic field is applied, the spinning solution in the liquid supply nozzle 10 accumulates charges on its surface under the action of high-voltage electrostatics. When the electrostatic force generated by the charges exceeds the surface tension of the spinning solution, the droplets at the nozzle outlet are stretched into a cone shape and ejected as charged jets from the cone tip. Under the combined action of electrostatic force, airflow stretching force, and its own inertial force, the jet undergoes high-speed whipping and solvent evaporation, eventually solidifying into nanoscale fibers and depositing them on the collection plate 12 with opposite charges. The introduction of electrostatic force significantly improves the fiber stretching efficiency, enabling finer fiber diameters at lower airflow intensities. At the same time, the charged fibers form a disordered accumulation on the collection plate 12 due to charge repulsion, constructing a high-porosity three-dimensional fluffy network structure, thereby ensuring the filtration effect.

[0046] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An apparatus for producing nanofiber filtration material, characterized by, include: A spinning mechanism includes: a liquid storage tank, a liquid supply pump connected to the output port of the liquid storage tank, and a liquid supply nozzle connected to the output port of the liquid supply pump. The input port of the liquid supply nozzle is connected to the output port of the liquid supply pump through a first corrugated pipe, and the axis of the liquid supply nozzle extends in a vertical direction. A stretching mechanism includes: an air pump, a jet head connected to the output port of the air pump, the input port of the jet head being connected to the output port of the air pump via a second bellows, and the axis of the jet head extending in a horizontal direction. The adjustment mechanism includes a drive assembly and a support, wherein the drive assembly is used to drive the support to move in a horizontal direction, and the first bellows and the second bellows are both connected to the support.

2. The apparatus for preparing nanofiber filter material according to claim 1, characterized in that: The number of preparation devices is multiple, and the multiple preparation devices are arranged at intervals along the first horizontal direction and the second horizontal direction. A control valve is provided between the air pump and the second bellows.

3. The device of claim 1, wherein: The drive assembly includes: a drive motor, a first gear fixedly connected to the output end of the drive motor, a second gear meshing with the first gear, a drive screw fixedly connected to the second gear, and a screw sleeve adapted to the drive screw, wherein the bracket is connected to the screw sleeve.

4. The device for preparing a nanofiber filter material according to claim 3, wherein: It also includes a first base, on which the liquid storage tank, the liquid supply pump and the adjustment mechanism are all disposed. The first base is provided with a fixing frame, and the drive motor is disposed inside the fixing frame.

5. The device for preparing a nanofiber filter material according to claim 4, wherein: It also includes a second base and a collection plate. The tensioning mechanism is disposed on the second base, which is disposed on one side of the first base. The collection plate is disposed on the output path of the liquid supply nozzle and the jet nozzle.

6. The device of claim 4, wherein: The fixed frame is provided with supports at both ends, and the two ends of the drive screw are rotatably connected to the fixed frame through the supports. A guide rod is provided between the supports at both ends, and the guide rod is movably inserted through the screw sleeve.

7. The device of claim 6, wherein: A support rod is connected to one side of the lead screw sleeve, and the end of the support rod is connected to the bracket.

8. The apparatus for preparing nanofiber filter material according to claim 7, characterized in that: The fixing frame is provided with a fixing seat, the fixing seat is embedded with a guide sleeve, and the support rod slides through the guide sleeve.

9. The device of claim 1, wherein: The axes of the liquid supply nozzle and the air jet nozzle are located in the same vertical plane.

10. The device of claim 1, wherein: The liquid supply nozzle and the collection plate are respectively connected to a positive power supply and a negative power supply.

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