CN109267160B - Arc array electrostatic spinning nozzle with sheath gas restraint - Google Patents
Arc array electrostatic spinning nozzle with sheath gas restraint Download PDFInfo
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- CN109267160B CN109267160B CN201811315128.1A CN201811315128A CN109267160B CN 109267160 B CN109267160 B CN 109267160B CN 201811315128 A CN201811315128 A CN 201811315128A CN 109267160 B CN109267160 B CN 109267160B
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- plate
- needle
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- needle head
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0069—Electro-spinning characterised by the electro-spinning apparatus characterised by the spinning section, e.g. capillary tube, protrusion or pin
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D13/00—Complete machines for producing artificial threads
- D01D13/02—Elements of machines in combination
Abstract
An arc array electrostatic spinning spray head with sheath gas restraint is provided with an upper cover plate, a needle head mounting plate, a conductive plate, a support plate, a needle head array and a gas hood; the upper cover plate is provided with a liquid inlet hole and is connected with the liquid supply device; the needle head mounting plate is of a stepped structure, and the height difference of the stepped structure is consistent with that of the needle head at the corresponding position; the conductive plate is connected with the positive electrode of the high-voltage power supply; the support plate is matched with the current-conducting plate, and is provided with a support plate through hole which is distributed coaxially with the hole on the current-conducting plate in the same size; the needle array is provided with needles arranged according to an arc array, the needles in the middle of the needle array are positioned at the lowest point, and the needles on the two sides of the needle array are symmetrically arranged; the air hood is provided with two air inlets and is connected with an air supply device through an air duct. The electrostatic spinning nanofiber membrane forming device can reduce electrostatic interference between electric field suppression dry jet heads of electrostatic spinning and multiple jets, improve the density and the jet stability of the multiple jets, improve the deposition efficiency of electrostatic spinning nanofibers and realize the rapid forming of large-area uniform nanofiber membranes.
Description
Technical Field
The invention relates to the field of electrostatic spinning, in particular to an arc-shaped array electrostatic spinning nozzle with sheath gas restraint.
Background
As a micro-nanofiber manufacturing technology, electrostatic spinning has attracted extensive attention of scholars and even industrial fields due to the advantages of simple equipment, controllable operation, wide raw materials, low cost and the like. The traditional single-nozzle electrostatic spinning efficiency is very low, only about 0.1g/h, and the improvement of the yield of the electrospun nanofibers is limited. The realization of the rapid and batch deposition preparation of the nanofiber membrane with uniform diameter and high porosity is the key point of the application research and is also the important precondition of the industrialized popularization of the electrostatic spinning technology. The research on the high-density multi-jet control strategy becomes the key of the batch electrostatic spinning. The multi-needle batch electrostatic spinning is the most direct way for improving the fiber yield, and the free surface drift of the charged jet flow can be effectively inhibited by adopting the nozzle, so that the fiber distribution uniformity is improved. The disadvantage is that the jet is difficult to spray continuously and stably due to the repulsion between adjacent nozzles and the non-uniform electric field at different nozzles (Theron S A, Yarin A L, Zussman E, et al. multiple jets in electrospraying: experimental and molding [ J ] Polymer,2005,46(9): 2889-. Therefore, weakening the repulsive interference among multiple jet flows and improving the jet flow density become important research points of the multi-needle batch electrostatic spinning.
Disclosure of Invention
The invention aims to provide an arc-shaped array electrostatic spinning nozzle with sheath gas restraint, which can reduce the electrostatic interference between electric field suppression dry jet and multi-jet in electrostatic spinning, improve the density and the injection stability of the multi-jet, promote the volatilization of a jet solvent, improve the quality of nano fibers, assist sheath gas to provide additional stretching and restraining effects on jet flow, reduce the diameter of electrospun nano fibers, improve the deposition efficiency of electrostatic spinning nano fibers and realize the rapid forming of large-area uniform nano fiber membranes.
The invention is provided with an upper cover plate, a needle head mounting plate, a conductive plate, a support plate, a needle head array and an air hood;
the upper cover plate is provided with a liquid inlet hole and is connected with a liquid supply device through a hose, so that the controllable quantitative supply of the spinning solution is ensured, and the spinning solution uniformly flows into each spinning needle head;
the needle head mounting plate is of a stepped structure, the height difference of the stepped structure is consistent with the height difference of the needle heads at the corresponding positions, a boss at the position corresponding to the needle head array is arranged on each step, the boss is in interference fit with an inner hole of the needle head, an arc-shaped groove is arranged inside the needle head mounting plate, the arc-shaped groove and an upper cover plate form a solution tank, sufficient buffer flowing space is provided for spinning solution, and through hole flow channels are arranged at the positions corresponding to the needle head array on the needle head mounting plate and used for realizing uniform liquid supply of all the;
the current-conducting plate is connected with the positive electrode of the high-voltage power supply and used for providing a space high-voltage electric field, the current-conducting plate is of a stepped structure, the step height difference is consistent with the height difference of the needle head at the corresponding position, the through hole of the current-conducting plate is arranged at the corresponding position of the needle head, the upper surface is ensured to be stably contacted with the frustum part of the needle head, and each needle head can conduct electricity well;
the supporting plate is matched with the current conducting plate, the supporting plate is provided with supporting plate through holes which are distributed coaxially with the holes in the current conducting plate in the same size, so that the needle head is convenient to mount and fix, and the problems of needle head falling off or poor current conduction and the like are avoided;
the needle array is provided with needles arranged according to an arc array, the needles in the middle of the needle array are positioned at the lowest point, and the needles on two sides of the needle array are symmetrically arranged;
the gas hood is provided with two air inlets, the gas hood is connected with a gas supply device through a gas guide pipe, the gas flow and the pressure are controlled by the pressure regulating valve, the bottom surface of the gas hood is a cambered surface, coaxial gas holes corresponding to the positions of the needles are formed in the bottom surface of the gas hood, the needles extend out of the gas hood by 1-3 mm, auxiliary gas flows in from the air inlets, flows out uniformly from the coaxial gas holes after the buffering effect of an airflow groove of the gas hood, and is jet-flow-formed into sheath gas restraint and stretching.
The liquid inlet holes can be 2-4.
The syringe needle can adopt 7 ~ 15 stainless steel point to glue the syringe needle, and the difference in height can be 0 ~ 8mm between the syringe needle and vary, and the syringe needle interval can be 5 ~ 20 mm.
The height of the boss can be 2-4 mm.
The diameter of the current-conducting plate through hole can be 1-3 mm.
The diameter of the through hole of the support plate can be 1-3 mm.
The needle head mounting plate is provided with a threaded hole, and the needle head mounting plate, the conductive plate and the support plate can be fixedly connected through locking screws.
The diameter of the coaxial air hole can be 1-2 mm.
The upper cover plate can be provided with a threaded hole, and the upper cover plate, the needle head mounting plate and the air hood can be fixedly connected through locking screws.
The conducting plate can be processed by a metal material, and the upper cover plate, the needle mounting plate, the supporting plate and the gas hood can be processed by an insulating material.
The invention can reduce the electrostatic interference between the electric field inhibition dry jet among the electrostatic spinning multi-jet nozzles, improve the density and the jet stability of the multi-jet, and improve the deposition efficiency of the electrostatic spinning nano-fiber, thereby realizing the rapid molding of the large-area uniform nano-fiber membrane.
The invention adopts the multi-needle array to carry out high-density multi-jet spinning, and can effectively improve the deposition efficiency of the electrospun nanofiber. The needle array adopts the arc mode of arranging, can effectively weaken the electric field interference suppression effect in many efflux injection processes, improves many efflux injection stability. By introducing sheath gas restraint, spinning jet injection is accelerated by using the drawing force of the auxiliary air flow, the fiber injection efficiency is improved, jet flow is refined, the diameter of the nanofiber is reduced, the volatilization of a jet flow solvent is promoted, the formation of a bead structure in the fiber is reduced, and the improvement of the film forming uniformity and the film forming quality of the electrospun fiber is facilitated. The auxiliary air flow can carry the surface charge of the moving needle tip and reduce the surface charge density of jet flow, thereby being beneficial to further reducing the electrostatic interference between jet flows and realizing the controllable jet printing of high-density multi-jet flow.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Fig. 2 is a top view of the gas shield.
Fig. 3 is a top view of the conductive plate.
In the figure, each label is: 1. the novel needle array structure comprises an upper cover plate, 2 needle mounting plates, 3 outer locking screws, 4 conductive plates, 5 supporting plates, 6 inner locking screws, 7 air hoods and 8 needle arrays.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Fig. 1 shows an embodiment of the present invention, which is provided with an upper cover plate 1, a needle mounting plate 2, an outer locking screw 3, a conductive plate 4, a support plate 5, an inner locking screw 6, an air cap 7 and a needle array 8. Be equipped with the screw hole on the syringe needle mounting panel 2, current conducting plate 4, backup pad 5 are by interior locking screw 6 fixed connection. The upper cover plate 1 is provided with a threaded hole, and the upper cover plate 1, the needle head mounting plate 2 and the air hood 7 are fixedly connected by an external locking screw 3. The syringe needle array 8 is glued the syringe needle by 7 stainless steel and is arranged according to the arc array and constitute, and the difference in height of outside syringe needle and intermediate position syringe needle is 12cm, syringe needle interval 15mm, and the intermediate position syringe needle is located the minimum, and both sides syringe needle symmetry is arranged.
The upper cover plate 1 is provided with 2 liquid inlet holes and is connected with a liquid supply device through a hose, so that the controllable quantitative supply of the spinning solution is ensured, and the spinning solution uniformly flows into the needle array 8.
The needle mounting plate 2 is of a stepped structure, the step height difference is consistent with the corresponding position needle height difference, a boss corresponding to the needle array is arranged on each step, and the boss is 3mm in height and is in interference fit with 8 inner holes of the needle array. The needle mounting plate 2 is internally provided with an arc-shaped groove which forms a solution tank with the upper cover plate 1 to provide sufficient buffer flowing space for spinning solution, and the needle mounting plate 2 is provided with a through hole flow channel corresponding to the needle array 8 to realize uniform liquid supply of each spinning needle.
The current conducting plate 4 links to each other with high voltage power supply positive pole, provides space high-voltage electric field, and for the stair structure, the ladder difference in height is unanimous with corresponding position syringe needle difference in height, is equipped with diameter 2 mm's through-hole in the syringe needle corresponds the position, guarantees that the upper surface all can well electrically conduct with the frustum part stable contact of syringe needle array 8, every syringe needle.
Backup pad 5 cooperates with the current conducting plate, is equipped with 2mm through-hole structure, with the coaxial distribution of hole on the current conducting plate, the installation and the fixed of the syringe needle of being convenient for avoid taking place the syringe needle and drop or electrically conduct bad scheduling problem.
The gas hood 7 is provided with two gas inlets which are connected with a gas supply device through a gas guide pipe, and the gas flow and the pressure intensity are controlled by a pressure regulating valve. The bottom surface is the cambered surface, and the design has the coaxial gas pocket that corresponds with 8 positions of syringe needle array, and coaxial gas pocket diameter is 1mm, and the syringe needle stretches out the gas hood 1 mm. The auxiliary gas flows in from the gas inlet hole, uniformly flows out from each coaxial gas hole after the buffer action of the airflow groove, and forms sheath gas restraint and stretching on the jet flow.
Fig. 2 is a top view of the air hood 7, which has mounting holes at both ends and is fixedly connected to the upper cover plate 1 and the needle mounting plate 2 by external locking screws 3. The bottom end of the air hood 7 is provided with a coaxial air hole corresponding to the position of the needle array 8, and the diameter of the coaxial air hole is 1 mm. The auxiliary gas uniformly flows out from each coaxial pore to restrain and stretch the sheath gas formed by the jet flow, so that the diameter of the jet flow and the fiber can be refined, the electrostatic interference can be reduced, and the jet flow jet stability and the film forming quality can be improved.
Fig. 3 is a top view of the conductive plate 4, which has mounting holes at two ends and is fixedly connected to the needle mounting plate 2 and the supporting plate 5 by internal locking screws 6. Be equipped with the coaxial through-hole that corresponds with 8 positions of syringe needle array on the current conducting plate 4, coaxial through-hole diameter 2mm, upper surface and syringe needle array 8's frustum part stable contact, every syringe needle all can be good electrically conductive. The current conducting plate 4 is connected with the positive pole of the high-voltage power supply through a wire, a high-voltage electric field is formed between the spray head and the collecting plate, and the spinning solution is stretched and deformed to generate jet flow, so that the nanofiber membrane is rapidly deposited on the collecting plate.
In the use process of the embodiment, the spinning solution is uniformly supplied to each spinning needle through the liquid inlet by the liquid supply device through the hose, the positive pole of the high-voltage power supply is connected with the conductive plate through the conducting wire to stably supply power to each needle, so that a high-voltage electric field is formed between the spray head and the collecting plate to form multi-jet high-density injection. The auxiliary airflow is supplied by the air supply device, the air flow and the pressure intensity are controlled by the pressure regulating valve, the auxiliary airflow enters the airflow groove from the air inlet of the air hood, and the auxiliary airflow uniformly flows out of each air hole after the auxiliary airflow is buffered, so that the restraint and the stretching effect on the jet flow are realized. According to actual requirements, the number of needles, the distance between needles, the radian of needle points and the like can be adjusted, so that the rapid deposition of large-area and uniform electrospun nanofiber membranes is promoted.
The needle array adopts an arc-shaped arrangement mode, so that the electric field interference suppression effect in the multi-jet injection process can be effectively reduced, and the multi-jet injection stability is improved. And sheath gas restraint is introduced, spinning jet flow injection is accelerated by using the drawing force of the auxiliary air flow, the fiber injection efficiency is improved, the diameter of the nanofiber is reduced, and the improvement of the film forming uniformity of the electrospun fiber is facilitated. The arc-shaped array multi-jet electrostatic spinning nozzle with sheath gas restraint can overcome electric field interference suppression in the multi-jet spraying process and promote efficient forming of large-area and uniform electrospun nanofiber membranes.
Claims (10)
1. An arc array electrostatic spinning spray head with sheath gas restraint is characterized by being provided with an upper cover plate, a needle head mounting plate, a conductive plate, a support plate, a needle head array and a gas hood;
the upper cover plate is provided with a liquid inlet hole and is connected with a liquid supply device through a hose, so that the controllable quantitative supply of the spinning solution is ensured, and the spinning solution uniformly flows into each spinning needle head;
the needle head mounting plate is of a stepped structure, the height difference of the stepped structure is consistent with the height difference of the needle heads at the corresponding positions, a boss at the position corresponding to the needle head array is arranged on each step, the boss is in interference fit with an inner hole of the needle head, an arc-shaped groove is arranged inside the needle head mounting plate, the arc-shaped groove and an upper cover plate form a solution tank, sufficient buffer flowing space is provided for spinning solution, and through hole flow channels are arranged at the positions corresponding to the needle head array on the needle head mounting plate and used for realizing uniform liquid supply of all the;
the current-conducting plate is connected with the positive electrode of the high-voltage power supply and used for providing a space high-voltage electric field, the current-conducting plate is of a stepped structure, the step height difference is consistent with the height difference of the needle head at the corresponding position, the through hole of the current-conducting plate is arranged at the corresponding position of the needle head, the upper surface is ensured to be stably contacted with the frustum part of the needle head, and each needle head can conduct electricity well;
the supporting plate is matched with the current-conducting plate, the supporting plate is provided with a supporting plate through hole which is coaxially distributed with the hole on the current-conducting plate in the same size, so that the needle head is convenient to mount and fix;
the needle array is provided with needles arranged according to an arc array, the needles in the middle of the needle array are positioned at the lowest point, and the needles on two sides of the needle array are symmetrically arranged;
the gas hood is provided with two air inlets, the gas hood is connected with a gas supply device through a gas guide pipe, the gas flow and the pressure are controlled by the pressure regulating valve, the bottom surface of the gas hood is a cambered surface, coaxial gas holes corresponding to the positions of the needles are formed in the bottom surface of the gas hood, the needles extend out of the gas hood by 1-3 mm, auxiliary gas flows in from the air inlets, flows out uniformly from the coaxial gas holes after the buffering effect of an airflow groove of the gas hood, and is jet-flow-formed into sheath gas restraint and stretching.
2. The arc-shaped array electrospinning nozzle of claim 1, wherein there are 2-4 liquid inlet holes.
3. The arc-shaped array electrospinning nozzle head with sheath gas restraint of claim 1, wherein 7-15 stainless steel dispensing needles are used as the needles, the height difference between the needles is 0-8 mm, and the distance between the needles is 5-20 mm.
4. The arc-shaped array electrospinning nozzle of claim 1, wherein the height of the boss is 2-4 mm.
5. The electrospinning nozzle of claim 1, wherein the diameter of the conductive plate through-holes is 1-3 mm.
6. The arc-shaped array electrospinning nozzle of claim 1, wherein the diameter of the supporting plate through-hole is 1-3 mm.
7. The arc-shaped array electrospinning nozzle of claim 1, wherein the needle mounting plate has a threaded hole, and the needle mounting plate, the conductive plate, and the support plate are fixedly connected by a locking screw.
8. The electrospinning nozzle of claim 1, wherein the diameter of the coaxial air holes is 1-2 mm.
9. The arc-shaped array electrospinning nozzle of claim 1, wherein the upper cover plate has a threaded hole, and the upper cover plate, the needle mounting plate, and the gas shield are fixedly connected by locking screws.
10. The arcuate array electrospinning nozzle of claim 1, wherein the conductive plate is made of a metallic material and the upper cover plate, the needle mounting plate, the support plate, and the gas shield are made of an insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811315128.1A CN109267160B (en) | 2018-11-06 | 2018-11-06 | Arc array electrostatic spinning nozzle with sheath gas restraint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811315128.1A CN109267160B (en) | 2018-11-06 | 2018-11-06 | Arc array electrostatic spinning nozzle with sheath gas restraint |
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| CN109267160A CN109267160A (en) | 2019-01-25 |
| CN109267160B true CN109267160B (en) | 2019-12-27 |
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| CN201811315128.1A Active CN109267160B (en) | 2018-11-06 | 2018-11-06 | Arc array electrostatic spinning nozzle with sheath gas restraint |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110670156A (en) * | 2019-09-26 | 2020-01-10 | 佛山轻子精密测控技术有限公司 | Needle tip induction electrostatic spinning nozzle and needle tip induction electrostatic spinning device |
| CN114318555A (en) * | 2021-11-24 | 2022-04-12 | 江苏飙鲛新材料科技有限公司 | Multi-micropore spray head for electrostatic spinning |
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| CN202595358U (en) * | 2012-05-31 | 2012-12-12 | 苏州大学 | Electrostatic spinning device |
| JP2013124426A (en) * | 2011-12-14 | 2013-06-24 | Mecc Co Ltd | Spinneret for producing nanofiber |
| CN103628150A (en) * | 2013-12-05 | 2014-03-12 | 厦门大学 | Multi-spray-head electrostatic spinning device |
| CN203960405U (en) * | 2014-07-03 | 2014-11-26 | 福建省贝思达环保投资有限公司 | A kind of seedpod of the lotus electrospinning shower nozzle |
| CN203976987U (en) * | 2014-08-11 | 2014-12-03 | 厦门大学 | The even air feed flow passage structure of a kind of sheath layer air-flow |
| CN206015157U (en) * | 2016-09-07 | 2017-03-15 | 厦门大学 | A kind of many fluid jet nozzles of the coaxial electrically spun for preparing composite cellulosic membrane |
-
2018
- 2018-11-06 CN CN201811315128.1A patent/CN109267160B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013124426A (en) * | 2011-12-14 | 2013-06-24 | Mecc Co Ltd | Spinneret for producing nanofiber |
| CN202595358U (en) * | 2012-05-31 | 2012-12-12 | 苏州大学 | Electrostatic spinning device |
| CN103628150A (en) * | 2013-12-05 | 2014-03-12 | 厦门大学 | Multi-spray-head electrostatic spinning device |
| CN203960405U (en) * | 2014-07-03 | 2014-11-26 | 福建省贝思达环保投资有限公司 | A kind of seedpod of the lotus electrospinning shower nozzle |
| CN203976987U (en) * | 2014-08-11 | 2014-12-03 | 厦门大学 | The even air feed flow passage structure of a kind of sheath layer air-flow |
| CN206015157U (en) * | 2016-09-07 | 2017-03-15 | 厦门大学 | A kind of many fluid jet nozzles of the coaxial electrically spun for preparing composite cellulosic membrane |
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| CN109267160A (en) | 2019-01-25 |
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Effective date of registration: 20221213 Address after: 362600 Part A, No. 04, Office, Floor 5, Times Square, Taocheng Town East Street, Yongchun County, Quanzhou City, Fujian Province Patentee after: Quanzhou Hengyi Enterprise Service Co.,Ltd. Address before: Xiamen City, Fujian Province, 361005 South Siming Road No. 422 Patentee before: XIAMEN University |
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