Continuous rotating electrostatic spinning device

Abstract

The utility model discloses a continuous rotating electrostatic spinning device which comprises a base, a liquid storage tank arranged on the base, a spinning head arranged in the liquid storage tank and a high-voltage power source. The spinning head comprises a center shaft rotating in the liquid tank, an insulation sleeve arranged on the center shaft and a conductive wire spirally wound on the insulation sleeve, and openings are formed in the position, corresponding to the upper half portion of the conductive wire, of the upper end of the liquid storage tank at intervals. By arranging the quasi-closed feeding loop, volatilization of a solvent in the liquid storage tank in the spinning process is effectively restrained, the viscosity change of the feed liquid is avoided, and the stability of the spinning state is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of electrospinning, specifically a continuous rotating electrospinning device. Background Technology

[0002] With the expansion of nanofiber applications, electrospinning technology has attracted much attention due to its convenience in preparing micro and nanofibers. Furthermore, a wide range of polymer systems are suitable for electrospinning. Currently, electrospinning is recognized as one of the simplest and most effective methods for preparing micro and nanofibers. However, since Formalas invented electrospinning technology in 1934, the mass production of nanofibers using electrospinning has not been widely promoted and applied. The main reasons are: firstly, the influencing factors of the electrospinning process are complex; secondly, it is limited by several factors in large-scale applications, such as needle blockage during spinning, uneven electric field distribution due to mutual repulsion between needles, needle dripping, and low spinning efficiency.

[0003] To improve the efficiency of electrospinning, multi-nozzle electrospinning devices were first invented. For example, Tomaszewski conducted spinning experiments using nozzles arranged in straight lines, ellipses, and circles; Theron experimented with single-needle, seven-needle, and nine-needle square arrangements. In multi-needle systems, uneven distribution of the spinning solution across nozzles can lead to some nozzles delivering more solution than required for spinning, causing the spinning solution at the nozzle tip to drip. To ensure a constant pressure or flow rate of spinning solution to each nozzle, electronically controlled multi-pump, multi-nozzle electrospinning machines were developed. These devices use multiple micro-injectors to precisely control the flow rate of each nozzle, but this method has poor industrial feasibility and high cost. Therefore, while multi-nozzle systems improve spraying efficiency to some extent, they cannot avoid electrostatic repulsion and interference between nozzles, as well as nozzle clogging. Moreover, regardless of whether it's a single-needle or multi-needle mode, random dripping is unavoidable when using a top-down spraying method.

[0004] In recent years, in order to improve efficiency, cylindrical needleless or other rotary electrospinning methods have been developed. However, the open feed tank during the rotation process causes the solvent to evaporate rapidly, which in turn affects the stability of the spinning state and the quality of the nanofibers due to the change in the viscosity of the feed solution. Alternatively, the discontinuous supply of the solution may force production to be interrupted. Utility Model Content

[0005] The purpose of this invention is to solve the above problems and provide a continuous rotating electrospinning device. The quasi-closed feeding circuit effectively suppresses the evaporation of solvent in the storage tank during the spinning process, avoids changes in the viscosity of the liquid, and ensures the stability of the spinning state.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A continuous rotating electrospinning device includes a base, a liquid storage tank disposed on the base, a spinning head disposed in the liquid storage tank, and a high-voltage power supply. The spinning head includes a central shaft rotating in the liquid storage tank, an insulating sleeve disposed on the central shaft, and a conductive wire spirally wound on the insulating sleeve. An opening is provided at a distance from the upper end of the liquid storage tank corresponding to the upper half of the conductive wire.

[0008] Furthermore, the insulating sleeve is in the shape of a hollow cylinder, fitted onto the central shaft, with the insulating sleeve protruding from both ends of the central shaft.

[0009] Furthermore, the outer cylindrical surface of the insulating sleeve is provided with a spiral protrusion, and the conductive wire is spirally arranged on the protrusion.

[0010] Furthermore, the liquid storage tank has an inlet at the center of the bottom and an outlet on the upper side.

[0011] Furthermore, the inner wall of the opening is in close contact with the conductive wire of the spinning head, and the distance between the two is .-mm.

[0012] Furthermore, the base is provided with a drive mechanism for rotating the central shaft.

[0013] Furthermore, the drive mechanism includes a motor and a coupling.

[0014] Furthermore, it also includes a positive electrode and a receiving counter electrode, wherein the positive electrode penetrates through the bottom of the storage tank.

[0015] The beneficial effects of this utility model are:

[0016] 1. The spinning head of this utility model includes a central shaft rotating within the liquid tank, an insulating sleeve mounted on the central shaft, and a conductive wire spirally wound around the insulating sleeve. An opening is provided at a distance from the upper end of the liquid tank corresponding to the upper half of the conductive wire. By setting a quasi-closed feeding circuit, solvent evaporation within the liquid tank during spinning is effectively suppressed, changes in the viscosity of the liquid are avoided, and the stability of the spinning process is ensured. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a left view of the spinning head of this utility model;

[0020] Figure 3 This is a front view of the spinning head of this utility model.

[0021] In the diagram: 1. Base; 2. Liquid storage tank; 3. High-voltage power supply; 4. Central shaft; 5. Insulating sleeve; 6. Conductive wire; 7. Protrusion; 8. Receiving electrode; 9. Feed inlet; 10. Discharge outlet; 11. Motor; 12. Positive electrode. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0023] like Figure 1 As shown, a continuous rotating electrospinning device includes a base 1, a liquid storage tank 2 disposed on the base 1, a spinning head disposed within the liquid storage tank 2, and a high-voltage power supply 3. The spinning head includes a central shaft 4 rotating within the liquid storage tank 2, an insulating sleeve 5 disposed on the central shaft 4, and a conductive wire 6 spirally wound around the insulating sleeve 5. An opening is provided at a distance from the upper end of the liquid storage tank corresponding to the upper half of the conductive wire 6. By setting a quasi-closed feeding circuit, solvent evaporation in the liquid storage tank during spinning is effectively suppressed, avoiding changes in liquid viscosity and ensuring the stability of the spinning state. The spinning head has a simple structure, is independently detachable, and is easy to disassemble, assemble, and clean, solving the inconvenience of loading, unloading, and cleaning a large number of spinning needles, reducing maintenance and repair costs, improving spinning efficiency, and facilitating large-scale production. The main component of the spinning head, the spiral ring, replaces the needle, solving the problems of needle blockage, electric field repulsion between needles, and low spinning efficiency in needle-type spinning nozzles.

[0024] The insulating sleeve 5 is a hollow cylindrical shape, fitted onto the central shaft 4, with both ends of the central shaft 4 protruding from the insulating sleeve. The inner diameter of the insulating sleeve is the same as the outer diameter of the central shaft 110, and the outer diameter of the insulating sleeve is 10-500mm. Its material includes PA, PTFE, PP, PE, and PEEK. By setting the insulating sleeve, insulation from nearby components is ensured, preventing electric field interference.

[0025] like Figure 1As shown, the outer cylindrical surface of the insulating sleeve 5 is provided with a spiral protrusion 7, and the conductive wire 8 is spirally arranged on the protrusion 7. The diameter of the conductive wire 8 is 0.1-5mm. The conductive wire is spun when energized. Previously, metal rollers were used to spin the wire on the surface of the rollers. However, this application uses conductive wire, which reduces the spinning area, reduces the critical voltage requirement, is easy to clean, has low loss, and is a continuous spinning process that will not break.

[0026] like Figure 2 As shown, the liquid storage tank 2 is a circle with a flat top when viewed from the side, and closed at both ends with the opening located on the plane. The liquid storage tank 2 has an inlet 9 at the bottom center and an outlet 10 on the upper side.

[0027] like Figure 1 As shown, the inner wall of the opening is in close contact with the conductive wire 8 of the spinning head, and the distance between the two is 0.1-5mm.

[0028] like Figure 1 As shown, the base 1 is equipped with a drive mechanism that drives the central shaft 4 to rotate.

[0029] The drive mechanism includes a motor 11 and a coupling. The motor is connected to the central shaft through the coupling and drives the central shaft to rotate. The coupling is made of high-voltage resistant insulating material, and the motor is fixed on the base 1.

[0030] like Figure 2 and Figure 3 As shown, it also includes a positive electrode 12 and a receiving electrode 13. The positive electrode 12 penetrates through the bottom of the liquid storage tank. The positive electrode 12 is a stainless steel rod. When the positive electrode is energized in the liquid, the charge enters the conductive wire through the liquid.

[0031] In the description of this utility model, it should be noted that the terms "left", "right", "up", "down", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A continuous rotating electrospinning device, comprising a base (1), a liquid storage tank (2) disposed on the base (1), a spinning head disposed in the liquid storage tank (2), and a high-voltage power supply (3), characterized in that, The spinning head includes a central shaft (4) that rotates within the liquid storage tank (2), an insulating sleeve (5) disposed on the central shaft (4), and a conductive wire (6) spirally wound on the insulating sleeve (5). The upper end of the liquid storage tank (2) is provided with an opening at a distance corresponding to the upper half of the conductive wire (6).

2. The continuous rotary electrospinning apparatus as described in claim 1, characterized in that, The insulating sleeve (5) is a hollow cylindrical shape and is fitted onto the central shaft (4), with the insulating sleeve protruding from both ends of the central shaft (4).

3. The continuous rotary electrospinning apparatus as described in claim 1, characterized in that, The outer cylindrical surface of the insulating sleeve (5) is provided with a spiral protrusion (7), and the conductive wire (6) is spirally arranged on the protrusion (7).

4. The continuous rotary electrospinning apparatus as described in claim 1, characterized in that, The liquid storage tank (2) has an inlet (9) at the bottom center and an outlet (10) on the upper side.

5. The continuous rotary electrospinning apparatus as described in claim 1, characterized in that, The inner wall of the opening is in close contact with the conductive wire (6) of the spinning head, and the distance between the two is 0.1-5mm.

6. The continuous rotary electrospinning apparatus as described in claim 1, characterized in that, The base (1) is provided with a drive mechanism that drives the central shaft (4) to rotate.

7. The continuous rotary electrospinning apparatus as described in claim 6, characterized in that, The drive mechanism includes a motor (11) and a coupling.

8. The continuous rotary electrospinning apparatus as described in claim 1, characterized in that, It also includes a positive electrode (12) and a receiving electrode (8), wherein the positive electrode (12) penetrates the bottom of the storage tank.

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