CN117005114A - Anti-blocking electrostatic spinning system for high-uniformity superfine fiber film production - Google Patents
Anti-blocking electrostatic spinning system for high-uniformity superfine fiber film production Download PDFInfo
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- CN117005114A CN117005114A CN202311018322.4A CN202311018322A CN117005114A CN 117005114 A CN117005114 A CN 117005114A CN 202311018322 A CN202311018322 A CN 202311018322A CN 117005114 A CN117005114 A CN 117005114A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000010041 electrostatic spinning Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 149
- 239000000243 solution Substances 0.000 claims abstract description 128
- 238000009987 spinning Methods 0.000 claims abstract description 87
- 239000007921 spray Substances 0.000 claims abstract description 66
- 230000005684 electric field Effects 0.000 claims abstract description 18
- 230000008021 deposition Effects 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
- 238000003860 storage Methods 0.000 claims description 54
- 238000009413 insulation Methods 0.000 claims description 39
- 238000007664 blowing Methods 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 24
- 230000008859 change Effects 0.000 claims description 12
- 238000001523 electrospinning Methods 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 11
- 239000011261 inert gas Substances 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 6
- 229920001410 Microfiber Polymers 0.000 claims description 3
- 238000009826 distribution Methods 0.000 abstract description 25
- 239000000463 material Substances 0.000 abstract description 11
- 229920000642 polymer Polymers 0.000 abstract description 7
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 37
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Classifications
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
-
- 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
-
- 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
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0092—Electro-spinning characterised by the electro-spinning apparatus characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields
Abstract
The invention discloses an anti-blocking electrostatic spinning system for high-uniformity superfine fiber film production, which comprises: the spray head device comprises a spinning seat, a plurality of spray heads are arranged on the spinning seat, a flow distribution cavity is arranged in the spinning seat, and the spray heads are communicated with the flow distribution cavity; a pressurized liquid supply device for pressurizing the solution and supplying the solution into the diversion chamber; a receiving device; and an electric field generating device electrically connected to the head device and the receiving device to form an electric field between the head device and the receiving device. The polymer solution is supplied to the flow distribution cavity of the spinning seat after being pressurized by the pressurizing liquid supply device, so that the flow distribution cavity is filled with high-pressure solution, the pressure of the solution at each nozzle is basically the same, the injection quantity of the solution at each nozzle is more similar, the fiber deposition distribution on the base material is more uniform, after the pressure of the solution is increased, the blocking condition of the nozzle can be reduced by the high-pressure solution, the injection quantity can be improved by the high-pressure solution, and the spinning production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of electrostatic spinning, in particular to an anti-blocking electrostatic spinning system for high-uniformity superfine fiber film production.
Background
Electrospinning is a special fiber manufacturing process in which a polymer solution is stretched in a strong electric field to form a jet of fibers that deposit on a substrate. One way of electrospinning is that a plurality of spray heads are mounted on a spinning base, and a polymer solution is simultaneously supplied to the plurality of spray heads.
In the existing electrostatic spinning system, when the solution is supplied to a plurality of spray heads, the pressure of the solution in part of spray heads is lower due to different positions of the spray heads, the sprayed solution is less, and the spray heads are uneven in distribution due to the fact that the solution is easy to gel, impurities exist in the solution or gather at the corner positions of a spinning tube, and the spray heads for producing the superfine fiber film are small in aperture and easy to block, so that the spray quantity of the solution of the spray heads is uneven, fiber deposition on a base material is uneven, and normal spinning is affected.
In addition, during the spinning process, the partially deposited fibers may still be in a solid-liquid mixed state, and in the solid-liquid mixed state, charges are accumulated, and the accumulated charges attract jet flows formed later, so that the fibers are locally accumulated to form spinning clouds, and uneven fiber deposition is caused.
Disclosure of Invention
The invention mainly aims to provide an anti-blocking electrostatic spinning system for high-uniformity superfine fiber film production, and aims to solve the technical problems that in the prior art, when a plurality of spray heads are used, the uniformity of spinning is affected due to uneven spray quantity, and the spray heads are easy to block.
In order to achieve the above object, the present invention provides an anti-clogging electrospinning system for producing a high-uniformity ultrafine fiber film, comprising:
the spray head device comprises a spinning seat, a plurality of spray heads for spraying solution are arranged on the spinning seat, a flow distribution cavity is arranged in the spinning seat, and the spray heads are communicated with the flow distribution cavity;
the pressurizing liquid supply device is connected with the spray head device and is used for pressurizing the solution and supplying the solution into the diversion cavity;
the receiving device is arranged corresponding to the position of the nozzle device, and a spinning space is formed between the nozzle device and the receiving device;
and an electric field generating device electrically connected with the nozzle device and the receiving device to form a spinning electric field between the nozzle device and the receiving device, so that the solution sprayed by the nozzle device forms fibers and is deposited on the substrate on the receiving device.
The polymer solution is supplied to the flow distribution cavity of the spinning seat after being pressurized by the pressurizing liquid supply device, so that the flow distribution cavity is filled with high-pressure solution, the pressure of the solution at each nozzle is more consistent, the injection quantity of the solution at each nozzle is more similar, the fiber deposition distribution on the base material is more uniform, after the pressure of the solution is increased, the blocking condition of the nozzle can be reduced by the high-pressure solution, the injection quantity can be improved by the high-pressure solution, and the spinning production efficiency is improved.
Preferably, the pressurizing liquid supply device comprises a liquid storage container, a liquid supply pipe and a first air pressure pressurizing device, a liquid storage cavity is arranged in the liquid storage container, a first air inlet communicated with the liquid storage cavity is formed in the liquid storage container, a first liquid inlet and a liquid supply port are formed in the liquid supply pipe, the first liquid inlet is formed in the inner side of the liquid storage cavity, the liquid supply port is communicated with the flow distribution cavity, the first air pressure pressurizing device is connected with the first air inlet and can apply air pressure to the liquid storage cavity, and therefore solution in the liquid storage cavity enters the liquid supply pipe from the first liquid inlet under the action of the air pressure and is supplied to the flow distribution cavity.
The polymer solution is in the liquid storage cavity of the liquid storage container, the first liquid inlet of the liquid supply pipe is at the lower side of the liquid level, the first air pressure pressurizing device applies air pressure to the liquid storage cavity to increase the pressure, the solution enters the liquid supply pipe from the first liquid inlet under the pressure of high air pressure, and is supplied to the diversion cavity of the spinning seat through the liquid supply pipe, so that the solution can be conveniently pressurized and supplied, the pressure is easy to control, and the air pressure can adapt to the change of the liquid level to keep applying the pressure; the charged solution is pressurized in a contactless manner by means of air pressure, so that the insulation requirements on the device can be reduced.
Preferably, the pressurized liquid supply device further comprises a solution consumption amount detection device, wherein the solution consumption amount detection device is used for detecting the consumption amount of the solution in the liquid storage container, the solution consumption amount detection device comprises a weight detector, the weight detector supports the liquid storage container, and the weight detector can detect the weight change value of the solution in the liquid storage container.
The weight detector can detect the weight change value of the solution in the liquid storage container, and can obtain the reduction amount of the solution in the production process and the injection amount of the solution, so that a producer can conveniently monitor and control the spinning amount, the production process is more controllable, and the uniformity of the spinning amount is improved.
Preferably, the solution consumption detecting means includes an insulating support plate, an insulating structure, and the weight detector, which are sequentially disposed from top to bottom, and the liquid storage container is disposed on an upper side of the insulating support plate.
An insulating support plate and an insulating structure are arranged between a liquid storage container filled with charged solution and the weight detector, the liquid storage container is placed on the insulating support plate, and the insulating structure is arranged on the lower side of the insulating support plate, so that the weight detector can be protected through the insulating action of the insulating support plate and the insulating structure, and the weight detector can operate more stably.
Preferably, the insulation structure comprises a first insulation piece, a middle insulation plate and a second insulation piece which are sequentially arranged from top to bottom, wherein a plurality of annular grooves which are vertically arranged at intervals are formed in the outer side wall of the first insulation piece and/or the outer side wall of the second insulation piece, and the cross sections of the first insulation piece and the second insulation piece are smaller than the cross section of the middle insulation plate.
The outer side walls of the first insulating piece and the second insulating piece are provided with a plurality of annular grooves which are arranged at intervals up and down, so that the creepage distance can be increased, the current is weakened, and the insulating effect is enhanced; an intermediate isolation plate with a larger cross-sectional area is arranged between the first insulating piece and the second insulating piece, and the creepage distance increased suddenly can enhance the insulating effect between the weight detector and the liquid storage container and between the weight detector and the charged solution, so that the weight detector is further protected.
Preferably, the solution consumption detecting device further comprises an insulating sealing cover, wherein the upper end and the lower end of the insulating sealing cover are respectively connected with the insulating supporting plate and the weight detector, the insulating structure is arranged on the inner side of the insulating sealing cover, a sealing space is formed among the insulating sealing cover, the insulating supporting plate and the weight detector, and a second air inlet for filling inert gas into the sealing space is formed in the insulating sealing cover.
A sealed space is formed among the insulating sealing cover, the insulating supporting plate and the weight detector, and inert gas can be filled into the sealed space through the second air inlet, so that the possibility of air breakdown caused by current can be reduced by the inert gas, and the insulating performance is further enhanced.
Preferably, the pressurizing liquid supply device further comprises a pressure detection device, a detection end of the pressure detection device is arranged in the diversion cavity, and the pressure detection device is used for detecting the solution pressure in the diversion cavity. The pressure detection device can detect the pressure of the solution in the shunt cavity, and the real-time pressure of the monitored solution can be conveniently known.
Preferably, the pressure detection device comprises a detection tube connected to the spinning seat, the lower side of the detection tube is communicated with the diversion cavity, the upper side of the detection tube is higher than the upper end of the diversion cavity, the upper side of the detection tube is connected with a second air pressure pressurizing device and an air pressure sensor, the second air pressure pressurizing device can add air pressure into the detection tube and enable the liquid level in the detection tube to be flush with the upper end of the diversion cavity, and the air pressure sensor can detect the air pressure in the detection tube and indicate the air pressure when the liquid level in the detection tube is flush with the upper end of the diversion cavity.
When the device works, part of solution in the split flow cavity enters the detection pipe from the lower side, the second air pressure pressurizing device is used for adding air pressure into the detection pipe from the upper side, pressure opposite to the direction of the second air pressure pressurizing device on the solution in the split flow cavity is generated, the air pressure output pressure of the second air pressure pressurizing device is regulated to enable the solution level in the detection pipe to be level with the upper end of the split flow cavity, at the moment, the air pressure value detected by the air pressure sensor is the internal pressure of the split flow cavity, and the air pressure sensor only takes air as a medium and does not contact with charged solution, so that the protection of the air pressure sensor is facilitated, and the insulation and corrosion resistance requirements are reduced.
Preferably, the anti-clogging electrostatic spinning system further comprises a turbulence device, wherein the turbulence device can blow air into the spinning space so as to change the deposition position of jet flow in the spinning space. The turbulence device blows air into the spinning space, and the wind field produces turbulence to jet flow in the spinning space, so that the fiber jet flow can change the deposition position under the action of the spinning electric field only, and the fiber is deposited on the substrate uniformly.
Preferably, the spinning seat is provided with a plurality of annular air injection holes, the plurality of air injection holes are arranged on the periphery of the plurality of spray heads in a one-to-one correspondence manner, and the air injection holes downwards spray annular air flow on the periphery of the corresponding spray heads so as to limit the outward deflection of the jet flow emitted by the spray heads positioned on the inner side.
When the material with high constraint requirements and high stability of drawing force is produced, annular air holes can be formed in the periphery of the spray head, air sprayed out of the air holes is coaxial with jet flow sprayed out of the spray head, the jet flow is limited to outwards deviate, and the influence of electrostatic attraction of side jet flow is reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the solutions of the prior art, the drawings which are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other drawings can be obtained from the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic front view of a first embodiment of the present invention;
FIG. 2 is a schematic front view of a spray head device and a pressurized liquid supply device according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram showing a solution consumption amount detection apparatus according to a first embodiment of the present invention;
fig. 4 is a schematic front view of a second embodiment of the present invention;
FIG. 5 is a schematic front view of a spray head device, a pressurized liquid supply device and a pressure detection device according to a third embodiment of the present invention;
FIG. 6 is a schematic front view of a spray head device according to a fourth embodiment of the present invention;
FIG. 7 is a schematic top view of a fifth embodiment of the present invention;
FIG. 8 is a schematic front view of a sixth embodiment of the present invention;
FIG. 9 is a schematic elevational view of a seventh embodiment of the present invention;
FIG. 10 is a schematic bottom view of a showerhead and gas injection holes according to a seventh embodiment of the invention;
FIG. 11 is a graph showing the effect of the flow velocity inside the flow distribution cavity when the cross section of the flow distribution cavity of the spinning seat is 10cm in diameter;
FIG. 12 is a graph showing the effect of the flow velocity inside the flow distribution chamber when the cross section of the flow distribution chamber of the spinning seat of the present invention is 50cm in diameter.
In the accompanying drawings: 1-shower head device, 11-spinning seat, 111-split cavity, 112-second liquid inlet, 12-shower head, 2-pressurized liquid supply device, 21-liquid storage container, 212-first air inlet, 22-liquid supply pipe, 221-first liquid inlet, 222-liquid supply port, 23-first air pressure pressurizing device, 24-first split pipe, 3-receiving device, 4-electric field generating device, 5-solution consumption detecting device, 51-weight detector, 52-insulating support plate, 53-insulating structure, 531-first insulating member, 532-middle insulating plate, 533-second insulating member, 534-annular groove, 54-insulating sealing cover, 541-second air inlet, 55-inert gas container, 6-metering liquid supply device, 7-pressure detecting device, 71-first flow control valve, 72-detecting pipe, 73-second air pressure pressurizing device, 731-second air compressor, 732-second booster pump, 74-air pressure sensor, 81-first side air blowing component, 82-second side air blowing component, 83-blowing component.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In addition, if a directional instruction such as up, down, left, right, front, rear, etc. is referred to in the embodiment of the present invention, the directional instruction is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional instruction is changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base the implementation on the basis of those skilled in the art, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist and is not within the scope of protection claimed by the present invention.
As shown in fig. 1 to 10, an anti-clogging electrospinning system for high-uniformity ultrafine fiber film production comprises a spray head device 1, a pressurized liquid supply device 2, a receiving device 3 and an electric field generating device 4.
The spray head device 1 comprises a spray wire seat 11, a plurality of spray heads 12 for spraying solution are arranged on the spray wire seat 11, a diversion cavity 111 is arranged in the spray wire seat 11, and the spray heads 12 are communicated with the diversion cavity 111. Specifically, the spinneret holder 11 is elongated, and the plurality of spray heads 12 are arranged along the length direction of the spinneret holder 11.
The pressurized liquid supply device 2 is connected to the head device 1, and the pressurized liquid supply device 2 is used for pressurizing and supplying the solution into the diversion chamber 111.
The receiving device 3 is arranged corresponding to the position of the nozzle device 1, a spinning space is formed between the nozzle device 1 and the receiving device 3, and the receiving device 3 is taken as an example below the nozzle device 1 in the embodiment; the substrate passes through the spinning space on the side close to the receiving means 3.
The electric field generating device 4 is electrically connected to the head device 1 and the receiving device 3 to form an electric field between the head device 1 and the receiving device 3, so that the solution ejected from the head device 1 forms fibers and is deposited on the substrate on the receiving device 3.
The polymer solution is supplied to the flow distribution cavity 111 of the spinning seat 11 after being pressurized by the pressurizing liquid supply device 2, so that the flow distribution cavity 111 is filled with high-pressure solution, the pressure of the solution at the position of each spray nozzle 12 is more uniform, the spraying quantity of the solution at each spray nozzle 12 is more similar, the fiber deposition distribution on the base material is more uniform, after the pressure of the solution is increased, the high-pressure solution can reduce the blocking condition of the spray nozzles 12, and particularly for the spray nozzles 12 of superfine fibers, the spraying quantity of the high-pressure solution can be increased, and the spinning production efficiency is improved.
Embodiment one:
referring to fig. 1 to 3, the pressurized liquid supply device 2 includes a liquid storage container 21, a liquid supply pipe 22 and a first air pressure pressurizing device 23, a liquid storage cavity is provided in the liquid storage container 21, a first air inlet 212 communicated with the liquid storage cavity is provided on the liquid storage container 21, the first air inlet 212 is provided at a position above the liquid storage cavity, the liquid supply pipe 22 is provided with a first liquid inlet 221 and a liquid supply port 222, the first liquid inlet 221 is provided at a position near the bottom of the liquid storage cavity, the liquid supply port 222 is communicated with the diversion cavity 111, the first air pressure pressurizing device 23 is connected with the first air inlet 212 and can apply air pressure to the liquid storage cavity, so that the solution in the liquid storage cavity enters the liquid supply pipe 22 from the first liquid inlet 221 under the action of the air pressure and supplies the solution to the diversion cavity 111. Since the solution is charged during the spinning operation, the solution is insulated from other parts, and thus the spinning base 11, the liquid storage container 21, the liquid supply pipe 22, and the like, which are in contact with the solution, are made of insulating materials.
The polymer solution is in the liquid storage cavity of the liquid storage container 21, the first liquid inlet 221 of the liquid supply pipe 22 is at the lower side of the liquid level, the first air pressure pressurizing device 23 applies air pressure to the liquid storage cavity to raise the pressure, the solution enters the liquid supply pipe 22 from the first liquid inlet 221 under the pressure of high air pressure, and is supplied to the diversion cavity 111 of the spinning seat 11 through the liquid supply pipe 22, so that the solution can be conveniently pressurized and supplied, the pressure is easy to control, and the air pressure can adapt to the change of the liquid level to keep applying the pressure; the charged solution is pressurized in a contactless manner by means of air pressure, so that the insulation requirements on the device can be reduced.
In some embodiments, the first pneumatic pressurizing device 23 is a first air compressor. The first air compressor pressurizes and delivers compressed air to the reservoir 21.
In some embodiments, referring to fig. 3, the pressurized liquid supply apparatus 2 further includes a solution consumption detecting apparatus 5, where the solution consumption detecting apparatus 5 is configured to detect a consumption of the solution in the liquid storage container 21, and the solution consumption detecting apparatus 5 includes a weight detector 51, where the weight detector 51 supports the liquid storage container 21, and where the weight detector 51 is configured to detect a weight change value of the solution in the liquid storage container 21.
The weight detector 51 can detect the weight change value of the solution in the liquid storage container 21, and can obtain the reduction amount of the solution in the production process and obtain the injection amount of the solution, so that the production process can be more controllable and the uniformity of the spinning amount can be improved, and the producer can conveniently monitor and control the spinning amount.
Further, the solution consumption amount detecting device 5 includes an insulating support plate 52, an insulating structure 53, and a weight detector 51, which are disposed in this order from top to bottom, the reservoir 21 is placed on the upper side of the insulating support plate 52,
an insulating support plate 52 and an insulating structure 53 are arranged between the liquid storage container 21 filled with the charged solution and the weight detector 51, the liquid storage container 21 is placed on the insulating support plate 52, the insulating structure 53 is arranged on the lower side of the insulating support plate 52, and the weight detector 51 can be protected through the insulating action of the insulating support plate 52 and the insulating structure 53, so that the weight detector 51 can operate more stably.
Further, the insulating structure 53 includes a first insulating member 531, an intermediate insulating plate 532, and a second insulating member 533 sequentially disposed from top to bottom, and a plurality of annular grooves 534 arranged at intervals from top to bottom are disposed on an outer sidewall of the first insulating member 531 and/or the second insulating member 533, and cross-sectional areas of the first insulating member 531 and the second insulating member 533 are smaller than that of the intermediate insulating plate 532.
The outer side walls of the first insulating member 531 and the second insulating member 533 are provided with a plurality of annular grooves 534 which are arranged at intervals up and down, so that the creepage distance can be increased, the current can be reduced, and the insulating effect can be enhanced; the intermediate isolation plate 532 with a larger cross-sectional area is arranged between the first insulating member 531 and the second insulating member 533, and the creepage distance increased suddenly can enhance the insulating effect between the weight detector 51 and the liquid storage container 21 and the charged solution, thereby further protecting the weight detector 51. The first insulating member 531, the middle insulating plate 532 and the second insulating member 533 may be made of insulating materials such as epoxy resin, POM, PE or glass fiber reinforced plastic, and have better insulating properties, and the materials of the first insulating member 531, the middle insulating plate 532 and the second insulating member 533 may have different dielectric constants, so that the insulating capability is improved, and preferably, the dielectric constants are gradually increased. In other embodiments, the insulating structure 53 may employ only one insulating member, or other numbers of stacked insulating members.
Further, the cross-sectional area of the middle insulating plate 532 is 1.5 to 2 times that of the first insulating member 531 and the second insulating member 533, so that the insulating effect is good and the occupied space is small.
Further, the solution consumption detecting device 5 further includes an insulation sealing cover 54, the upper end and the lower end of the insulation sealing cover 54 are respectively connected to the insulation supporting plate 52 and the weight detector 51, the insulation structure 53 is arranged on the inner side of the insulation sealing cover 54, a sealing space is formed among the insulation sealing cover 54, the insulation supporting plate 52 and the weight detector 51, and a second air inlet 541 for filling inert gas into the sealing space is arranged on the insulation sealing cover 54.
A sealed space is formed among the insulating sealing cover 54, the insulating support plate 52 and the weight detector 51, the second air inlet 541 can be connected with the inert gas container 55, inert gas can be filled into the sealed space through the second air inlet 541, and the possibility of air breakdown by current can be reduced by the inert gas, so that the insulating performance is further enhanced.
Embodiment two:
referring to fig. 4, the pressurized liquid supply device 2 further includes a metering liquid supply device 6, and the metering liquid supply device 6 is used for quantitatively supplying the solution into the liquid storage cavity.
In the spinning production process, the metering liquid supply device 6 quantitatively supplies the solution into the liquid storage cavity, the solution is delivered to the spray head 12 by air pressure, so that the spray head 12 sprays the solution in a substantially equal amount in the spinning process, and the uniformity of the spinning quantity is improved.
In some embodiments, the pressurized liquid supply apparatus 2 further includes a pressure detection apparatus 7, the detection end of the pressure detection apparatus 7 is disposed in the diversion cavity 111, and the pressure detection apparatus 7 is used for detecting the solution pressure in the diversion cavity 111. The pressure detection device 7 can detect the pressure of the solution in the diversion cavity 111, so that the real-time pressure of the monitored solution can be conveniently known. In some embodiments, the pressure detecting device 7 is a PP diaphragm pressure gauge, and the PP diaphragm pressure gauge is connected to the spinning seat 11 and connected to the shunt cavity 111, so as to perform a certain insulation effect while detecting pressure.
Embodiment III:
referring to fig. 5, the pressure detecting device 7 includes a detecting tube 72 connected to the spinning seat 11, the lower side of the detecting tube 72 is communicated with the diversion chamber 111, the upper side of the detecting tube 72 is higher than the upper end of the diversion chamber 111, the upper side of the detecting tube 72 is connected with a second air pressure pressurizing device 73 and an air pressure sensor 74, the second air pressure pressurizing device 73 can add air pressure into the detecting tube 72 and enable the liquid level in the detecting tube 72 to be flush with the upper end of the diversion chamber 111, and the air pressure sensor 74 can detect the air pressure in the detecting tube 72 and indicate the air pressure when the liquid level in the detecting tube 72 is flush with the upper end of the diversion chamber 111. The liquid supply pipe 22 and the detection pipe 72 may be connected to both sides of the spinneret holder 11 in the longitudinal direction. The detection tube 72 may be a PTFE high pressure resistant tube.
During operation, part of the solution in the diversion cavity 111 enters the detection tube 72 from the lower side, the second air pressure pressurizing device 73 is used for adding air pressure into the detection tube 72 from the upper side, the pressure opposite to the direction of the second air pressure pressurizing device 73 on the solution in the diversion cavity 111 is generated, the air pressure output pressure of the second air pressure pressurizing device 73 is regulated to enable the solution level in the detection tube 72 to be level with the upper end of the diversion cavity 111, at the moment, the air pressure value detected by the air pressure sensor 74 is the internal pressure of the diversion cavity 111, and the air pressure sensor 74 only takes air as a medium and does not contact with the charged solution, so that the air pressure sensor 74 is protected, and insulation and corrosion resistance requirements are reduced. To facilitate comparing the liquid level with the upper end of the shunt cavity 111, a scale may be provided on the detection tube 72 for easy inspection. The second air pressure increasing device 73 includes a second air compressor 731 and a second booster pump 732, and the second air compressor 731, the second booster pump 732, and the detection pipe 72 are connected in this order, and the second booster pump 732 can re-pressurize the air compressed from the second air compressor 731 and then convey the air into the detection pipe 72. The air pressure sensor 74 can be a digital display meter, which is convenient for reading.
Embodiment four:
referring to fig. 6, in this embodiment, the spinneret holder 11 is provided with a plurality of second liquid inlets 112 which are all communicated with the diversion cavity 111, the plurality of second liquid inlets 112 are arranged along the length direction of the spinneret holder 11, a plurality of second liquid separation pipes are arranged on the liquid supply pipe 22 in a branching manner, the plurality of second liquid separation pipes are connected with the plurality of second liquid inlets 112 in a one-to-one correspondence manner, and a second flow control valve is arranged on the second liquid separation pipe and is used for adjusting the flow rate of the solution entering the diversion cavity 111 so as to adjust the solution pressure at different positions in the diversion cavity 111.
The plurality of second liquid inlets 112 are arranged at a plurality of positions in the length direction on the spinning seat 11, and the second flow control valves are arranged to control corresponding flow, so that the solution pressure distribution at a plurality of positions in the diversion cavity 111 is more uniform.
Fifth embodiment:
referring to fig. 7, the number of the spinning seats 11 and the number of the pressure detection devices 7 are plural, a plurality of first liquid separating pipes 24 are arranged between the pressurizing liquid supply device 2 and the spinning seats 11, the first liquid separating pipes 24 and the spinning seats 11 are connected with the pressure detection devices 7 in a one-to-one correspondence manner, a first flow control valve 71 is arranged on the first liquid separating pipes 24, and the first flow control valve 71 is used for adjusting the flow of the solution entering the flow dividing cavity 111 so as to adjust the pressure of the solution in the flow dividing cavity 111.
Each pressure detecting device 7 detects the solution pressure of each spinning seat 11, and according to the solution pressure of each spinning seat 11, the first flow control valve 71 is adjusted to adjust the solution pressure of the corresponding spinning seat 11, so that the solution pressures of the plurality of spinning seats 11 are substantially the same, and spinning is more uniform. The first flow control valve 71 may be manually controlled by a manual control operator according to the pressure of the pressure detecting means 7, or the first flow control valve 71 may be electrically controlled, the first flow control valve 71 being communicatively connected to the pressure detecting means 7, the first flow control valve 71 automatically adjusting the flow according to the pressure of the pressure detecting means 7.
In some embodiments, the anti-clogging electrospinning system further comprises a turbulence device capable of blowing air into the spinning space. During spinning, when only the spinning electric field is applied, the previously deposited fibers are attractive to the subsequently deposited fibers and a mutual electrostatic repulsive force is generated between the fiber jets formed by each spray head 12, resulting in uneven distribution of the deposited fibers on the substrate. According to the scheme, through increasing the turbulence device to blow in the spinning space, the wind field produces disturbance deflection to the fiber jet in the spinning space, so that the fiber jet can change the deposition position under the action of the spinning electric field, the attraction of charge aggregation in a solid-liquid mixing state on the base material to the jet can be weakened, and the fiber deposition is uniform on the base material.
The medium of the wind is air, so that the cost is low and the controllability is good. For materials which are in reaction denaturation when contacted with air, inert gas protection materials such as argon, helium, nitrogen and the like and spinning environment are selected, and for solvent media which are easy to generate spinning discharge or have low explosion concentration, insulating gas with high dielectric strength is selected to avoid discharge ignition.
The turbulent air can be controlled in a programmable way, and the air quantity is regulated according to the concentration of the solution or the binding force of the fiber and the like. The air quantity can be controlled in a pulse mode, for low-concentration spinning solution, the low-concentration spinning solution volatilizes fast in a spinning space, turbulent air is regulated in a pulse mode, turbulent air smaller than rated air quantity can be formed, the uniformity of spinning is improved, and spinning defects such as yarn hanging, needle point gel and the like caused by complete volatilization of the spinning solution in advance are avoided, so that the spinning state is influenced.
Example six:
referring to fig. 8, the spoiler device includes a first side air blowing component 81 and a second side air blowing component 82, the first side air blowing component 81 and the second side air blowing component 82 are respectively disposed at both sides between the head device 1 and the receiving device 3, and the first side air blowing component 81 and the second side air blowing component 82 are capable of blowing air from both sides of the head device 1 and the receiving device 3 to the middle, respectively.
The first side blowing component 81 and the second side blowing component 82 blow from two sides to the middle part respectively, the jet flow formed by the spray heads 12 positioned at the sides generates force leaning to the middle part, electrostatic repulsive force between the jet flows is at least partially counteracted, the distance between the middle part and the side of the spinning area is closer, the uniformity of fiber deposition on the middle part and the side area is improved, and the utilization rate of fiber materials can be improved. The first side air blowing component 81 and the second side air blowing component 82 can select turbulent air generating devices such as air outlet of the air compressor, air outlet of the progressive fan, roots blower and the like according to turbulent air volume, flow, energy consumption and the like. The blowing angle can be horizontal or a certain included angle is formed between the blowing angle and the horizontal direction, and the blowing angle can be adjusted according to the actual fiber deposition condition.
In other embodiments, the turbulence device comprises a blowing device arranged on the upper side, the blowing device blows air from one side of the nozzle device 1 into the spinning space, the blowing angle is vertically downward, the wind field generates turbulence at a position close to the substrate, and the deposition uniformity of the fibers on the substrate can be improved by changing the position of the fibers on the substrate. The fan generating turbulent flow wind can be arranged above the relative spinning space, the turbulent flow direction is the same as the spinning direction, the drafting and thinning effects are achieved on spinning, the spinning solution is enabled to be volatilized completely faster, the generation of a solid-liquid mixed state is reduced, the phenomenon of spinning cloud spots is weakened, meanwhile, the turbulent flow wind is utilized to reduce the restriction of a jet flow electric field, and the uniformity of a formed fiber film is improved. When the blowing angles of the first side blowing component 81 and the second side blowing component 82 are set to have a downward direction, a disturbance is generated at a position close to the substrate, and the uniformity of fiber deposition can be further improved by matching with transverse wind force.
Embodiment seven:
referring to fig. 9 and 10, the spinning seat 11 is provided with a plurality of annular air injection holes 83, the plurality of air injection holes 83 are arranged on the outer circumferences of the plurality of nozzles 12 in a one-to-one correspondence manner, and the air injection holes 83 inject annular air flow downwards on the outer circumferences of the corresponding nozzles 12 so as to limit the outward deflection of the jet flow injected by the nozzle 12 positioned on the inner side.
When the material with high constraint requirements and high stability of drawing force is produced, annular air jet holes 83 can be arranged on the periphery of the spray head 12, air jetted by the air jet holes 83 is coaxial with jet flow jetted by the spray head 12, the jet flow is limited to outwards deviate, and the influence of electrostatic attraction force of side jet flow is reduced.
In some embodiments, the spinneret holder 11 is circular tube-shaped, the inner diameter ID of the spray heads 12 is 0.13 mm-2.64 mm, the sectional area S of the diversion cavity 111 is equal to or larger than the number n of spray heads 12 on the spinneret holder 11 x the inner diameter ID x 2.5 of the spray heads 12, the larger the sectional area S of the diversion cavity 111, the larger the weight of the internal solution can increase the pressure at the spray heads 12, the larger the specific volume (S/(n x ID) is, the more uniform the pressure among the spray heads 12 is, preferably id=0.9 mm, n=200, s=50 cm, and the uniformity of the pressure and flow velocity of each spray head 12 can be further improved under the cooperation of the above values.
The effect on the flow rate of the spray head 12 when the number of spray heads 12, the inner hole of the spray head 12 and the liquid pressure inside the distribution chamber 111 are the same when the diameters of the cross sections of the distribution chamber 111 are 10cm and 50cm are compared with each other, respectively, is shown with reference to fig. 11 and 12. The flow rate at the plurality of nozzles 12 in fig. 11 shows a significant change in the velocity gradient and affects the flow in the space above the nozzles 12 inside the distribution chamber 111; whereas the flow rates inside the diversion chamber 111 and at the positions of the plurality of spray heads 12 of fig. 12 are relatively uniform.
In some embodiments, the receiving device 3 includes a receiving electrode, where the receiving electrode is electrically connected to the negative electrode of the electric field generating device 4 or grounded, and the width of the spraying range of the plurality of spray heads 12 on one spinning seat 11 is W1, so that the width of the receiving electrode W2, w2=w1.
The width W2 of the receiving electrode is larger than the width W1 of the spray ranges of the plurality of spray heads 12, and the fiber deposition range can be dispersed, so that the width of the intermediate uniform deposition portion is larger, and the utilization rate of the fiber material can be improved. The deposition effect is good in the range of w2=w1.
In some embodiments, the electric field has a voltage of 100-140KV. The electric field force can be increased and the spinning effect can be improved by increasing the voltage of the electric field to 100-140KV.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. An anti-clogging electrospinning system for high uniformity ultrafine fiber film production, comprising:
the spray head device (1) comprises a spinning seat (11), wherein a plurality of spray heads (12) for spraying solution are arranged on the spinning seat (11), a diversion cavity (111) is arranged in the spinning seat (11), and the spray heads (12) are communicated with the diversion cavity (111);
a pressurized liquid supply device (2) connected with the nozzle device (1), wherein the pressurized liquid supply device (2) is used for pressurizing a solution and supplying the solution into the diversion cavity (111);
a receiving device (3) which is arranged corresponding to the position of the nozzle device (1), wherein a spinning space is formed between the nozzle device (1) and the receiving device (3);
and an electric field generating device (4) electrically connected with the nozzle device (1) and the receiving device (3) to form a spinning electric field between the nozzle device (1) and the receiving device (3), so that the solution sprayed by the nozzle device (1) forms fibers and is deposited on the substrate on the receiving device (3).
2. The anti-clogging electrostatic spinning system as claimed in claim 1, wherein the pressurized liquid supply device (2) comprises a liquid storage container (21), a liquid supply pipe (22) and a first air pressure pressurizing device (23), a liquid storage cavity is arranged in the liquid storage container (21), a first air inlet (212) communicated with the liquid storage cavity is arranged on the liquid storage container (21), a first liquid inlet (221) and a liquid supply port (222) are arranged on the liquid supply pipe (22), the first liquid inlet (221) is arranged on the inner side of the liquid storage cavity, the liquid supply port (222) is communicated with the diversion cavity (111), and the first air pressure pressurizing device (23) is connected with the first air inlet (212) and can apply air pressure into the liquid storage cavity, so that solution in the liquid storage cavity enters the liquid supply pipe (22) from the first liquid inlet (221) under the action of the air pressure and is supplied to the diversion cavity (111).
3. The anti-clogging electrospinning system according to claim 2, wherein the pressurized liquid feeding device (2) further comprises a solution consumption detecting device (5), the solution consumption detecting device (5) is used for detecting the consumption of the solution in the liquid storage container (21), the solution consumption detecting device (5) comprises a weight detector (51), the weight detector (51) supports the liquid storage container (21), and the weight detector (51) can detect the weight change value of the solution in the liquid storage container (21).
4. An anti-clogging electrospinning system as in claim 3, wherein the solution consumption detecting means (5) comprises an insulating support plate (52), an insulating structure (53) and the weight detector (51) arranged in this order from top to bottom, and the liquid storage container (21) is placed on the upper side of the insulating support plate (52).
5. The anti-clogging electrostatic spinning system as claimed in claim 4, wherein the insulation structure (53) comprises a first insulation member (531), a middle insulation plate (532) and a second insulation member (533) which are sequentially arranged from top to bottom, a plurality of annular grooves (534) which are vertically arranged at intervals are respectively arranged on the outer side wall of the first insulation member (531) and/or the outer side wall of the second insulation member (533), and the cross sectional areas of the first insulation member (531) and the second insulation member (533) are smaller than the cross sectional area of the middle insulation plate (532).
6. The anti-clogging electrospinning system according to claim 4, wherein the solution consumption detecting device (5) further comprises an insulation sealing cover (54), the upper and lower ends of the insulation sealing cover (54) are respectively connected to the insulation supporting plate (52) and the weight detector (51), the insulation structure (53) is provided on the inner side of the insulation sealing cover (54), a sealing space is formed between the insulation sealing cover (54), the insulation supporting plate (52) and the weight detector (51), and a second air inlet (541) for filling inert gas into the sealing space is provided on the insulation sealing cover (54).
7. The anti-clogging electrospinning system according to claim 1, wherein the pressurized liquid feeding device (2) further comprises a pressure detecting device (7), the detecting end of the pressure detecting device (7) is disposed in the diversion cavity (111), and the pressure detecting device (7) is used for detecting the solution pressure in the diversion cavity (111).
8. The anti-clogging electrospinning system according to claim 7, wherein the pressure detecting device (7) comprises a detecting tube (72) connected to the spinneret holder (11), the lower side of the detecting tube (72) is communicated with the shunt chamber (111), the upper side of the detecting tube (72) is higher than the upper end of the shunt chamber (111), a second air pressure pressurizing device (73) and an air pressure sensor (74) are connected to the upper side of the detecting tube (72), the second air pressure pressurizing device (73) can add air pressure into the detecting tube (72) and make the liquid level in the detecting tube (72) flush with the upper end of the shunt chamber (111), and the air pressure sensor (74) can detect the air pressure in the detecting tube (72) and indicate the air pressure when the liquid level in the detecting tube (72) is flush with the upper end of the shunt chamber (111).
9. The anti-clogging electrospinning system of claim 1, further comprising a turbulence device capable of blowing air into the spinning space to change the deposition location of the jet in the spinning space.
10. The anti-clogging electrostatic spinning system as claimed in claim 9, wherein a plurality of annular air injection holes (83) are provided on the spinning base (11), the plurality of air injection holes (83) are provided on the outer circumferences of the plurality of spray heads (12) in a one-to-one correspondence manner, and the air injection holes (83) inject annular air flow downwards on the outer circumferences of the corresponding spray heads (12) so as to limit the jet injected by the spray heads (12) located on the inner side from being deflected outwards.
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| CN202311018322.4A CN117005114A (en) | 2023-08-11 | 2023-08-11 | Anti-blocking electrostatic spinning system for high-uniformity superfine fiber film production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117344392A (en) * | 2023-12-06 | 2024-01-05 | 西南石油大学 | Light heat-resistant PIPD nanofiber preparation equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117344392A (en) * | 2023-12-06 | 2024-01-05 | 西南石油大学 | Light heat-resistant PIPD nanofiber preparation equipment |
| CN117344392B (en) * | 2023-12-06 | 2024-02-02 | 西南石油大学 | Light heat-resistant PIPD nanofiber preparation equipment |
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