CN112936845A - Ultrasonic electrofluid on-demand jetting device and method for jetting liquid drops by using same - Google Patents
Ultrasonic electrofluid on-demand jetting device and method for jetting liquid drops by using same Download PDFInfo
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- CN112936845A CN112936845A CN202110096000.6A CN202110096000A CN112936845A CN 112936845 A CN112936845 A CN 112936845A CN 202110096000 A CN202110096000 A CN 202110096000A CN 112936845 A CN112936845 A CN 112936845A
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- perforated plate
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- 239000007788 liquid Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 28
- 239000007921 spray Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims description 29
- 239000000758 substrate Substances 0.000 claims description 27
- 238000003860 storage Methods 0.000 claims description 22
- 230000005684 electric field Effects 0.000 claims description 15
- 230000005284 excitation Effects 0.000 claims description 13
- 230000005686 electrostatic field Effects 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 230000008676 import Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000007787 electrohydrodynamic spraying Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000007639 printing Methods 0.000 description 2
- 230000035485 pulse pressure Effects 0.000 description 2
- PUAQLLVFLMYYJJ-UHFFFAOYSA-N 2-aminopropiophenone Chemical compound CC(N)C(=O)C1=CC=CC=C1 PUAQLLVFLMYYJJ-UHFFFAOYSA-N 0.000 description 1
- 238000010146 3D printing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/112—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using individual droplets, e.g. from jetting heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Special Spraying Apparatus (AREA)
- Electrostatic Spraying Apparatus (AREA)
Abstract
The invention discloses an ultrasonic electrofluid on-demand spraying device and a method for spraying liquid drops by the same. Due to the acoustic pressure, the taylor cone and the droplet formation time are both shorter than in conventional jetting devices, thereby increasing the jetting frequency of the device; and when the spray orifice is blocked, the spray orifice can be unblocked by applying a momentarily larger acoustic pressure.
Description
Technical Field
The invention relates to an ultrasonic electrofluid on-demand spraying device and a method for spraying liquid drops by using the same.
Background
Ultrasonic waves have the advantages of concentrated energy, small energy loss, good directivity, strong reflectivity, long propagation distance in liquid and easy acquisition of strong sound energy, so the ultrasonic waves are widely applied to the control of the liquid. The electric field spraying technology has the advantages of difficult nozzle blockage, wide range of spraying materials and small size of sprayed liquid drops, and the sprayed liquid drops are generally in a micron-nanometer scale to be used in the fields of 3D printing, biological cell separation, medicine production and the like.
Sonic spraying methods have been described in detail in a number of documents. For example, patent document "Elrod S a, Khuri-Yakub B T, quat C f, planar print for acoustic printing: US 1988" uses a piezoelectric element to generate vibration to generate sound waves in liquid, focuses the sound waves at a liquid surface using a spherical acoustic lens, and reflects most of the sound waves at the liquid surface due to acoustic impedance mismatch between the liquid and air, and generates sound pressure to push the liquid surface to eject. Similar sonic spray techniques have been applied in several patents, such as the documents "Stearns R G, quick S a. acousticejection a drople of fluid from a respiratory by an acousticfluid ejection apparatus: US 2015.", "Elrod S a, hamioglu B, Lim M, et al. Most sonic jet technologies do not need a nozzle, and the problem that the nozzle is easy to block in the traditional pressure jet method can be effectively solved. The pressure at the outlet can be controlled by adjusting the frequency of the ultrasonic waves, and the size of the liquid drops can be controlled within a certain range. In addition to using concave focusing sound waves, there is also a document that uses a fresnel lens to focus sound waves, which has the advantage that the fresnel lens has smaller thickness than the concave surface, and is conveniently manufactured into a lens array by using a photolithography method to improve the efficiency of ejection. However, due to the limited range of transducer operating frequencies, when the required range of droplet diameter variation is large, transducers with different frequencies need to be used, and if other driving forces exist, the dependence on the acoustic frequency can be reduced when controlling the droplet size.
The technique of electrohydrodynamic spraying is based on the polarization phenomenon of a dielectric in an electric field. When the dielectric medium is in an electric field, molecules in the dielectric medium which is originally electrically neutral can generate electric dipole moment due to the action of the electric field, so that high charge density is generated at the interface of the dielectric medium and the outside. The electric charge at the interface of the two fluids is subject to the force of the electric field and thus accumulates at a point on the liquid surface, and when the force of the electric field on the liquid surface is sufficiently large, the liquid breaks through the action of the surface tension to generate a jet phenomenon. Many documents have developed corresponding electrohydrodynamic spraying devices based on this phenomenon. Such as "Barton K, Leo T L Y. electroluminescent design JET PRINTING DEVICE WITH EXTRACTOR:2014.
Compared with the traditional pressure jet technology, the electro-fluid jet technology is less prone to nozzle blockage. However, nozzle clogging can also occur when spraying certain materials that are too viscous, have a large mass loading, or have large particles. When the nozzle clogging phenomenon occurs, the conventional electro-fluid spraying apparatus has no way to solve the problem because it uses a constant pressure or a constant flow rate input. On the other hand, when used for drop-on-demand jetting, the frequency of the electro-fluid drop-on-demand jetting cannot be increased because the dielectric needs a certain time to accumulate enough charge at the liquid surface tip to break through the electric field force. In order to improve the frequency of the electrohydrodynamic spraying and improve the spraying efficiency, the combined action of pulse pressure and electric field force is generally adopted to accelerate the liquid drop spraying process, and the electric field force is often used as one driving force and the pulse pressure is used as another driving force, such as documents of' Huang Yong an, Hou, Liuyu, and the like. And the pressure at the nozzle is not well controlled, which is not conducive to producing uniform ejected droplets.
Disclosure of Invention
In order to solve the problems of low spraying frequency and possibility of nozzle blockage when certain specific materials are sprayed in the conventional electrofluid spray device, the invention provides an ultrasonic electrofluid demand spray device which is provided with an ultrasonic transducer and an acoustic lens, such as a concave lens or a Fresnel lens, and can focus ultrasonic energy at a spray outlet to provide driving pressure and accelerate formation of a Taylor cone and liquid drops so as to improve the spraying frequency. When the nozzle sprays certain materials with high viscosity, large mass load or large particles, the nozzle is not easy to block due to the combined action of the acoustic pressure and the electric field force, so that the parameter range of the sprayed materials is improved; also, when the nozzle is clogged, a larger acoustic pressure pulse can be used to unblock the nozzle.
The present invention also provides a method for jetting micro-droplets using such an electro-fluidic droplet jetting apparatus.
The technical scheme adopted by the invention for solving the technical problems is as follows: an ultrasonic electrofluid on-demand spraying device comprises a substrate, a perforated plate, a medium substrate, a piezoelectric element, an excitation signal source, an electroacoustic transducer, a material storage cavity and a high-voltage power supply; wherein the base plate ground connection, electrically conductive material's perforated plate is connected on the storage cavity, be connected with high voltage power supply simultaneously, it has the solution import to open on the storage cavity, the spraying material can be followed the solution import and continuously supplied to the storage cavity in, the storage cavity bottom is connected on the medium basement, make concave surface acoustic lens or connect fresnel acoustic lens on the medium basement and the one side of spraying material contact, the medium basement simultaneously, the shape that storage cavity and perforated plate except that the solution import should be the axial symmetry shape, medium basement bottom is connected with electroacoustic transducer, piezoelectric element on the electroacoustic transducer receives excitation signal source control.
Further, the materials of the media substrate and the fresnel acoustic lens should be acoustically coupled with the jetted material.
Further, the focal point of the concave acoustic lens or fresnel acoustic lens should be located on the central axis of the hole of the perforated plate and near the exit of the hole.
A method for spraying liquid drops by using the ultrasonic electrofluid drop-on-demand spraying device comprises the following steps:
(a) cleaning impurities in the perforated plate, the material storage cavity and the medium substrate;
(b) inputting the spraying material from the solution inlet by pressure or other methods, and filling the material storage cavity with the spraying material, wherein the liquid level is positioned at the small hole on the perforated plate;
(c) inputting pulse high voltage to the perforated plate through a high-voltage power supply, forming an electrostatic field between the perforated plate and the substrate, outputting a pulse signal to the piezoelectric element by an excitation signal source, generating ultrasonic waves through vibration, focusing the ultrasonic waves at a small hole of the perforated plate through a concave acoustic lens or a Fresnel acoustic lens on a medium substrate, and driving the lower liquid level to deform and spray under the simultaneous driving of the acoustic pressure and the electric field force;
(d) after the pulse high voltage and the excitation signal are simultaneously removed, the jetted liquid generates necking fracture, and liquid drops are formed and deposited on the substrate 1, so that a jetting cycle is completed.
Advantageous effects
The device controls an ultrasonic transducer to generate ultrasonic waves through an excitation signal source, focuses the ultrasonic waves on the small holes of the ejection outlet through an acoustic lens on a medium substrate, applies pulse voltage on the perforated plate where the small holes of the ejection outlet are located to form an electrostatic field between the perforated plate and the substrate, and quickly deforms the liquid level under the combined action of the acoustic pressure and the electric field force to form ejection liquid drops. Due to the acoustic pressure, the taylor cone and the droplet formation time are both shorter than in conventional jetting devices, thereby increasing the jetting frequency of the device; and when the spray orifice is blocked, the spray orifice can be dredged by applying a transient larger sound pressure, namely, the invention solves the problems by combining an ultrasonic spray technology and an electric fluid spray technology, and the sound pressure and the electric field force are jointly acted on the liquid surface to improve the frequency of spraying according to requirements, and simultaneously, the energy of the ultrasonic wave is utilized to dredge the nozzle when needed.
Drawings
FIG. 1 is a schematic structural view of an ultrasonic electrofluid drop-on-demand spray apparatus according to the present invention;
FIG. 2 is a schematic structural diagram of a Fresnel acoustic lens attached to the side of a medium substrate in contact with a spray material in the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
referring to fig. 1, the ultrasonic electrofluid on-demand spraying device of the present invention comprises a substrate 1, a perforated plate 2, a dielectric substrate 4, a piezoelectric element 5, an excitation signal source 6, an electroacoustic transducer 7, a material storage cavity 9, and a high voltage power supply 10; wherein the base plate 1 ground connection, the orifice plate 2 is connected on the storage cavity 9, and be electrically conductive material, be connected with high voltage power supply 10 simultaneously, it has solution import 3 to open on the storage cavity 9, it can be followed solution import 3 and continuously supplied to in the storage cavity 9 to spray material 11, storage cavity 9 bottom is connected on medium base 4, make concave acoustic lens 8 or connect fresnel acoustic lens 12 (as shown in fig. 2) on the medium base 4 and the one side that spray material 11 contacted, simultaneously medium base 4, storage cavity 9 and orifice plate 2 except that solution import 3 the shape should be the axial symmetry shape, medium base 4 bottom is connected with electroacoustic transducer 7, piezoelectric element 5 on the electroacoustic transducer 7 is controlled by excitation signal source 6.
When spraying, the interior of the reservoir 9, the concave acoustic lens 8 on the media substrate 4, and the perforated plate 2 are cleaned first, and then the spray material 11 is fed into the reservoir 9 from the solution inlet 3 by external pressure with the liquid surface at the small hole on the perforated plate 2.
After the liquid level is stable, pulse high voltage is input to the perforated plate 2 through the high-voltage power supply 10, an electrostatic field is formed between the perforated plate 2 and the substrate 1, meanwhile, the excitation signal source 6 outputs pulse signals to the piezoelectric element 5, ultrasonic waves are induced by vibration, the pulse signals are focused on the small holes of the perforated plate 2 through the concave acoustic lens 8 or the Fresnel acoustic lens 12 on the medium substrate 4, and the liquid level is driven to deform and spray under the driving of the acoustic pressure and the electric field force.
After the pulse high voltage and the excitation signal are simultaneously removed, the jetted liquid generates necking fracture, and liquid drops are formed and deposited on the substrate 1, so that a jetting cycle is completed. The ultrasonic electrofluid on-demand jet device has high jet frequency due to the driving pressure provided by the ultrasonic waves; and the acoustic lens focuses energy at the small hole of the ejection opening, the sound pressure at the ejection outlet is much higher than that at other positions of the solution, and the sound pressure at the small hole of the ejection opening can be further controlled by adjusting the frequency output by the excitation signal source 6 to adjust the frequency of the ultrasonic wave.
When some materials with too high viscosity, large mass load or large particles are sprayed to cause the blockage of a spraying outlet, the driving signal source 6 can be adjusted to improve the output ultrasonic frequency and provide a larger pulse sound pressure to dredge the nozzle so as to ensure the normal operation of the nozzle.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. An ultrasonic electrofluid drop on demand spray apparatus, comprising: the piezoelectric ceramic material-saving device comprises a substrate (1), a perforated plate (2), a medium substrate (4), a piezoelectric element (5), an excitation signal source (6), an electroacoustic transducer (7), a material storage cavity (9) and a high-voltage power supply (10); the substrate (1) is grounded, the perforated plate (2) made of conductive materials is connected to the storage cavity (9) and is connected with the high-voltage power supply (10), the solution inlet (3) is formed in the storage cavity (9), the spraying materials (11) can be continuously supplied to the storage cavity (9) from the solution inlet (3), the bottom end of the storage cavity (9) is connected to the medium substrate (4), the concave acoustic lens (8) or the Fresnel acoustic lens (12) is formed in the surface, in contact with the spraying materials (11), of the medium substrate (4), the storage cavity (9) and the perforated plate (2) except the solution inlet (3) are in an axial symmetry shape, the bottom of the medium substrate (4) is connected with the electroacoustic transducer (7), and the piezoelectric element (5) on the electroacoustic transducer (7) is controlled by the excitation signal source (6).
2. An ultrasonic electrofluidic drop on demand device as claimed in claim 1, wherein: the materials of the medium substrate (4) and the Fresnel acoustic lens (12) are acoustically coupled with the jet material (11).
3. An ultrasonic electrofluidic drop on demand device as claimed in claim 1, wherein: the focus of the concave acoustic lens (8) or the Fresnel acoustic lens (12) is positioned on the central axis of the hole of the perforated plate (2) and near the outlet of the hole.
4. A method of ejecting droplets using the ultrasonic electrofluidic drop-on-demand device of claim 1, comprising the steps of:
(a) impurities in the perforated plate (2), the material storage cavity (9) and the medium substrate (4) are removed;
(b) inputting the spraying material (11) from the solution inlet (3) through pressure, and enabling the spraying material (11) to fill the material storage cavity (9), wherein the liquid level position is at a small hole on the perforated plate (2);
(c) pulse high voltage is input to the perforated plate (2) through a high-voltage power supply (10), an electrostatic field is formed between the perforated plate (2) and the substrate (1), meanwhile, a signal source (6) is excited to output a pulse signal to the piezoelectric element (5), ultrasonic waves are induced by vibration, the pulse signal is focused on a small hole of the perforated plate (2) through a concave acoustic lens (8) or a Fresnel acoustic lens (12) on the medium substrate (4), and the liquid level is driven to deform and jet at the same time of acoustic pressure and electric field force;
after the pulse high voltage and the excitation signal are simultaneously removed, the jetted liquid generates necking fracture, liquid drops are formed and deposited on the substrate (1), and a jetting cycle is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110096000.6A CN112936845A (en) | 2021-01-25 | 2021-01-25 | Ultrasonic electrofluid on-demand jetting device and method for jetting liquid drops by using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110096000.6A CN112936845A (en) | 2021-01-25 | 2021-01-25 | Ultrasonic electrofluid on-demand jetting device and method for jetting liquid drops by using same |
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| CN112936845A true CN112936845A (en) | 2021-06-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116237101A (en) * | 2023-03-20 | 2023-06-09 | 哈尔滨工程大学 | Micro-droplet generation device and micro-droplet generation method based on bubble necking effect |
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2021
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| JPH02235644A (en) * | 1989-03-08 | 1990-09-18 | Fujitsu Ltd | Ink jet recorder |
| JPH02269058A (en) * | 1989-03-14 | 1990-11-02 | Seiko Epson Corp | Liquid drop jet device by use of rayleigh mode surface acoustic wave |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116237101A (en) * | 2023-03-20 | 2023-06-09 | 哈尔滨工程大学 | Micro-droplet generation device and micro-droplet generation method based on bubble necking effect |
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