CN111013464B - A kind of contact ultrasonic needle rapid stirring and efficient atomization method - Google Patents
A kind of contact ultrasonic needle rapid stirring and efficient atomization method Download PDFInfo
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- CN111013464B CN111013464B CN201911202032.9A CN201911202032A CN111013464B CN 111013464 B CN111013464 B CN 111013464B CN 201911202032 A CN201911202032 A CN 201911202032A CN 111013464 B CN111013464 B CN 111013464B
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- 238000000889 atomisation Methods 0.000 title claims abstract description 36
- 238000003756 stirring Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000011859 microparticle Substances 0.000 claims abstract description 18
- 239000002105 nanoparticle Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000005855 radiation Effects 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 23
- 238000004090 dissolution Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
- B01F31/80—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F6/00—Air-humidification, e.g. cooling by humidification
- F24F6/12—Air-humidification, e.g. cooling by humidification by forming water dispersions in the air
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
本发明涉及超声技术领域，公开了一种接触式超声针快速搅拌及高效雾化方法，包括S1在反应容器中加入溶液与微/纳颗粒；S2调整超声针进入反应容器中溶液的深度；S3启动压电换能器，调整压电换能器的工作频率与工作电压；S4实现快速搅拌与高效雾化。与现有技术相比，本发明无需加热或添加任何化学试剂即可实现微/纳颗粒在液体中的充分溶解，并通过超声雾化效应将微/纳颗粒包裹在微液滴内释放到外界，可在加湿空气的同时起到散布特定微/纳颗粒的作用，可以应用到化工与生活中。本发明采用压电材料励振且无搅拌旋转部件，使用的装置具有成本低、可靠性好、易小型化和便携化等优点。
The invention relates to the field of ultrasonic technology, and discloses a method for rapid stirring and high-efficiency atomization of a contact ultrasonic needle. Start the piezoelectric transducer, adjust the working frequency and working voltage of the piezoelectric transducer; S4 realizes rapid stirring and efficient atomization. Compared with the prior art, the present invention can realize the full dissolution of the micro/nano particles in the liquid without heating or adding any chemical reagents, and release the micro/nano particles in the micro droplets to the outside through the ultrasonic atomization effect. , which can disperse specific micro/nano particles while humidifying the air, and can be applied to chemical industry and life. The invention adopts piezoelectric material to excite vibration without stirring and rotating parts, and the used device has the advantages of low cost, good reliability, easy miniaturization and portability, and the like.
Description
Technical Field
The invention relates to the technical field of ultrasound, in particular to a contact type ultrasonic needle rapid stirring and efficient atomization method.
Background
With the rapid development of the scientific fields such as micro-nano manufacturing and biomedicine, how to realize the rapid stirring dissolution of micro/nano particles and the efficient atomization of micro droplets in a low-cost, high-efficiency and chemical-addition-free manner in laboratories and industrial production has become an important technical subject of scientific research at present. The existing solution stirring methods comprise a mechanical method, a magnetic method, a heating method, an ultrasonic method and the like, wherein the ultrasonic method has the advantages of simple structure, convenient use, cleanness, sanitation, uniform mixing and the like. The existing atomization methods comprise pressure atomization, rotary disc atomization, gas atomization, ultrasonic atomization and the like, wherein the ultrasonic atomization has the advantages of simple and easy operation, small and uniform fog drops, controllable fog quantity and the like.
At present, some devices and methods are available for solving the problems of rapid stirring dissolution of micro/nano particles in liquid and efficient atomization of micro-droplets. CN105944898B discloses a water flow ultrasonic high-efficiency atomizing device under narrow slit air flow oscillation stirring, which utilizes the cooperation of an air flow baffle plate and an air flow self-oscillation cavity to form an air flow self-oscillation field, so that liquid led out from the outlet of a jet flow water reducing channel is opposite to the water flow ultrasonic oscillation cavity, thereby realizing the high-efficiency atomization of the liquid. The disadvantages of this liquid stirring and atomization are: the device has a complex structure, the water mist channel, namely the nozzle, is easy to block, and is not suitable for atomizing the liquid mixed with micro/nano particles.
Accordingly, there is a need for improvements in the art to address the deficiencies of the prior art.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a contact type ultrasonic needle rapid stirring and high-efficiency atomizing method, which converts the vibration energy of a piezoelectric transducer into the high-frequency vibration of an ultrasonic needle connected with the piezoelectric transducer, so that the direct stirring of the ultrasonic needle contacted with liquid and the micro-bubble burst jet flow caused by ultrasonic cavitation can generate high-speed acoustic vortex in the liquid, and liquid molecules overcome the surface tension to form atomized micro-droplet cloud clusters.
The technical scheme is as follows: the invention provides a contact type ultrasonic needle rapid stirring and efficient atomizing method which is realized in a device, wherein the device comprises a reaction container, a piezoelectric transducer, a vibration connecting piece and a plurality of ultrasonic needles, the piezoelectric transducer is arranged right above the reaction container, the vibration connecting piece is fixed on a vibration radiation surface of the piezoelectric transducer, and the ultrasonic needles are dispersedly fixed on the vibration connecting piece and are contacted with liquid in the reaction container; the method comprises the following steps:
s1, adding the solution and the micro/nano particles into a reaction container;
s2, adjusting the depth of the ultrasonic needle entering the solution in the reaction container;
s3, starting the piezoelectric transducer, and adjusting the working frequency and the working voltage of the piezoelectric transducer;
s4 realizes rapid stirring and high-efficiency atomization.
Further, the azimuth angle of the ultrasonic needle entering the solution in the reaction vessel in the S2 can be adjusted, the depth of the ultrasonic needle entering the solution can be adjusted, and the ultrasonic needle is not in contact with the wall of the reaction vessel.
Further, the working frequency of the piezoelectric transducer in the S3 is continuously adjustable from 20kHz to 400kHz, and the working voltage is continuously adjustable from 1V to 20V.
Further, the piezoelectric transducer is a piezoelectric sheet or a langevin vibrator with different working frequency points.
Further, the solution in S2 is water or an organic solution.
Further, the vibration connecting piece and the ultrasonic needle are made of inert materials which do not react with the solution,
further, the vibration connecting piece is a metal sheet.
Furthermore, the ultrasonic needles are bonded, welded or in threaded connection with the vibration connecting piece in a cantilever beam mode, and included angles between the ultrasonic needles and the vibration connecting piece are different.
Has the advantages that:
1. the invention converts the vibration energy of the piezoelectric transducer into the high-frequency vibration of the cantilever beam type ultrasonic needle connected with the piezoelectric transducer, the direct stirring of the ultrasonic needle contacted with the liquid and the micro-bubble burst jet flow caused by ultrasonic cavitation can generate high-speed acoustic vortex in the liquid, and the liquid molecules overcome the surface tension to form atomized micro-droplet cloud.
2. The invention can realize the full dissolution of the micro/nano particles in the liquid without heating or adding any chemical reagent, and the micro/nano particles are wrapped in the micro liquid drops through the ultrasonic atomization effect and released to the outside, thereby playing the role of dispersing specific micro/nano particles while humidifying the air.
3. The invention adopts piezoelectric material to excite and has no stirring rotating part, and the device used by the invention has the advantages of low cost, good reliability, easy miniaturization, portability and the like.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus used in the contact ultrasonic needle rapid stirring and high-efficiency atomization method of the present invention;
FIG. 2 is a graph showing the relationship between the depth of the ultrasonic needle inserted into water and the speed of liquid level descent (atomization rate) when the input frequency and the input voltage are constant according to the present invention;
FIG. 3 is a graph showing the relationship between the input voltage and the liquid level descending speed (atomization rate) when the input frequency and the depth of the ultrasonic needle inserted into the solution are constant;
FIG. 4 is a graph showing the relationship between the liquid level descending speed (atomization rate) and the input frequency when the ultrasonic needle of the present invention is inserted into the solution at a constant depth and the input voltage.
Wherein, 1-piezoelectric transducer, 2-vibration connecting piece, 3-ultrasonic needle, 4-solution, 5-reaction container, 6-micro/nano particle, 7-acoustic vortex and 8-atomized micro liquid drop.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the method for rapid stirring and efficient atomization with a contact ultrasonic needle of the present invention is implemented in a device for rapid stirring and efficient atomization with a contact ultrasonic needle, which is used in laboratories, living rooms, or industrial production to achieve rapid dissolution and efficient atomization of micro/nano particles, the device for rapid stirring and efficient atomization with a contact ultrasonic needle of the present invention comprises a piezoelectric transducer 1, a vibration connector 2, a plurality of ultrasonic needles 3, a solution 4, a reaction container 5, micro/nano particles 6, etc., the piezoelectric transducer 1 is disposed over the reaction container 5, the vibration connector 2 is fixed on a vibration radiation surface of the piezoelectric transducer 1, and the plurality of ultrasonic needles 3 are dispersedly fixed on the vibration connector 2 and are in contact with the solution in the reaction container 5.
The invention relates to a contact type ultrasonic needle rapid stirring and efficient atomizing method, which comprises the following steps:
step 1: the solution 4 and the micro/nano particles 6 are respectively added into the reaction vessel 5 to be mixed.
Step 2: the depth of the ultrasonic needle 3 into the solution in the reaction vessel 5 is adjusted.
And step 3: and starting the piezoelectric transducer 1, and adjusting the working frequency and the working voltage of the piezoelectric transducer 1.
And 4, step 4: realize rapid stirring and high-efficient atomizing.
The piezoelectric transducer 1 is used for ultrasonic excitation, the vibration connecting piece 2 transmits the vibration of the piezoelectric transducer 1 to the ultrasonic needle 3, the ultrasonic needle 3 is in contact with a solution 4 contained in a reaction container 5, micro/nano-particles 6 are dispersed in the solution 4 or suspended on the interface of the solution and air, the micro/nano-particles 6 are inorganic substances or organisms which can be dissolved or not dissolved in the solution, and the reaction container 5 does not react with the solution 4 and the micro/nano-particles 6.
The vibration connecting piece 2 is fixed on the vibration radiation surface of the piezoelectric transducer 1, the piezoelectric transducer 1 can be a piezoelectric piece or a Langerwen vibrator with different working frequency points, an annular piezoelectric piece can be selected in an experiment, the inner diameter and the outer diameter of the annular piezoelectric piece are respectively 10mm and 20mm, the thickness of the annular piezoelectric piece is 3mm, and the vibration connecting piece 2 in the embodiment is an aluminum sheet, but is not limited to the aluminum sheet and can be other metal sheets. The aluminum square thin plate type vibration connecting piece 2 with the side length of 40mm is set to be 1mm in thickness and is bonded to one side of the vibration radiation surface of the annular piezoelectric piece. The working frequency point of the annular piezoelectric sheet is in an ultrasonic level and is continuously adjustable from 20kHz to 400kHz in experiments, and the working voltage of the annular piezoelectric sheet is continuously adjustable from 1V to 20V. The ultrasonic needle 3 can be rod pieces with different cross sections and axial shapes, different lengths and different materials, the vibration connecting piece 2 and the ultrasonic needle 3 are made of inert materials which do not react with the solution 4, the ultrasonic needle 3 is fixed at different positions of the vibration connecting piece 2 in a bonding, welding or thread mode, and the arrangement angles of the ultrasonic needles 3 and the vibration connecting piece 2 are different, the azimuth angle of the ultrasonic needle 3 relative to the solution 4 is adjustable, the depth of the ultrasonic needle 3 extending into the solution 4 is adjustable, but the ultrasonic needle 3 is not contacted with the wall of the reaction container 5, in the embodiment, an XYZ three-dimensional moving platform is used for supporting the piezoelectric transducer 1 and the vibration connecting piece 2, and the spatial inclination angle of the vibration connecting piece 2 can be changed through the XYZ three-dimensional moving platform so as to adjust the azimuth angle of the ultrasonic needle 3 relative to the solution 4; the height of the vibration connecting piece 2 can be changed through an XYZ three-dimensional moving platform so as to adjust the depth of the ultrasonic needle 3 extending into the solution 4.
In the embodiment, an organic glass tensile tube with the minimum diameter of 50 μm and the total length of 40mm is selected as the ultrasonic needle 3, the ultrasonic needle 3 is bonded to the aluminum vibration connecting piece 2 of the annular piezoelectric sheet in a cantilever beam manner, and the included angles between the plurality of ultrasonic needles 3 and the vibration connecting piece 2 are different. When the piezoelectric transducer 1 works at different frequency points, the vibration connecting piece 2 and the ultrasonic needle 3 can be driven to generate different modes of vibration, and the vibration amplitude is amplified near the needle point through the ultrasonic needle 3 in a cantilever beam mode. The ultrasonic needle 3 is in contact with the solution 4, deionized water is selected as the solution 4 in the embodiment, and the depth of the plurality of different organic glass stretching tubes inserted into the deionized water is controlled to be between 1mm and 5 mm. Due to the high-frequency vibration and the nonlinear effect of the ultrasonic field, the organic glass stretching tube generates acoustic vortex 7 and cavitation bubbles in deionized water, see figure 1, and generates atomized micro-droplets 8 in the shape of cloud near the interface of the solution and the air.
In the embodiment, yeast particles with an average radius of 5 μm can also be used as tracer particles of the eddy current field, and when the working input frequency point of the annular piezoelectric plate is 80kHz and the input voltage is 15V, a high-speed eddy current field can be observed through the yeast tracer particles, and the generation of a large amount of atomized micro-droplets can be observed near the interface of the ultrasonic needle, the solution and the air. Therefore, the device can realize the rapid stirring and the efficient atomization of the solution.
Referring to fig. 2, 3 and 4, the relationship between the liquid level descending rate of the solution 4 and the depth of the ultrasonic needle 3 inserted into the water, the input voltage of the piezoelectric transducer 1 and the input frequency is shown in fig. 2, and it can be seen that the liquid level descending speed is slower, i.e. the atomization rate is lower, the deeper the depth of the ultrasonic needle 3 inserted into the water is under the condition of constant input voltage of the input frequency. As can be seen from fig. 3, when the input frequency and the insertion depth are constant, the higher the input voltage is, the faster the liquid level falls, that is, the higher the atomization rate is. It can be seen from fig. 4 that, when the insertion depth and the input voltage are constant, the liquid level descending speed is approximately in a descending trend along with the input frequency, i.e. the larger the input frequency is, the smaller the atomization rate is. Thus, controllable adjustment of the atomization rate can be achieved by increasing the ultrasonic atomization amount of the device by decreasing the depth of the ultrasonic needle 3 inserted into the water, increasing the input voltage of the piezoelectric transducer 1, and setting the input frequency of the piezoelectric transducer 1 to the resonance point of the piezoelectric transducer 1.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. A contact type ultrasonic needle rapid stirring and efficient atomization method is characterized in that the method is realized in a device, the device comprises a reaction container (5), a piezoelectric transducer (1), a vibration connecting piece (2) and a plurality of ultrasonic needles (3), the piezoelectric transducer (1) is arranged right above the reaction container (5), the vibration connecting piece (2) is fixed on a vibration radiation surface of the piezoelectric transducer (1), and the ultrasonic needles (3) are dispersedly fixed on the vibration connecting piece (2) and are contacted with a solution in the reaction container (5); the method comprises the following steps:
s1, respectively adding the solution (4) and the micro/nano particles (6) into a reaction container (5) for mixing;
s2, adjusting the depth of the ultrasonic needle (3) entering the solution in the reaction container (5);
s3, starting the piezoelectric transducer (1) and adjusting the working frequency and the working voltage of the piezoelectric transducer (1);
s4 realizes rapid stirring and high-efficiency atomization.
2. The contact ultrasonic needle rapid stirring and high-efficiency atomization method as claimed in claim 1, wherein the azimuth angle of the ultrasonic needle (3) entering the solution (4) in the reaction vessel (5) in the S2 is adjustable, the depth of the ultrasonic needle entering the solution is adjustable, and the ultrasonic needle (3) is not in contact with the wall of the reaction vessel (5).
3. The contact type ultrasonic needle rapid stirring and high-efficiency atomizing method as claimed in claim 1, characterized in that the piezoelectric transducer (1) is a piezoelectric patch or Langervin vibrator with different working frequency points.
4. The contact type ultrasonic needle rapid stirring and high-efficiency atomizing method as claimed in claim 3, characterized in that the operating frequency of the piezoelectric transducer (1) in S3 is continuously adjustable from 20kHz to 400kHz, and the operating voltage is continuously adjustable from 1V to 20V.
5. The contact ultrasonic needle rapid stirring and high-efficiency atomizing method as claimed in claim 1, wherein the solution (4) in S2 is water or an organic solution.
6. The contact ultrasonic needle rapid stirring and high-efficiency atomization method according to claim 5, characterized in that the vibration connecting piece (2) and the ultrasonic needle (3) are made of inert materials which do not react with the solution (4).
7. The contact ultrasonic needle rapid stirring and high-efficiency atomization method according to claim 6, wherein the vibration connecting piece (2) is a metal sheet.
8. The contact type ultrasonic needle rapid stirring and high-efficiency atomizing method according to any one of claims 1 to 7, characterized in that the ultrasonic needle (3) and the vibration connecting piece (2) are bonded, welded or screwed in a cantilever manner, and the included angles between the plurality of ultrasonic needles (3) and the vibration connecting piece (2) are different.
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| CN112844271A (en) * | 2020-12-29 | 2021-05-28 | 杭州电子科技大学 | Ultrasonic suspension device for solution crystallization and experimental method |
| CN114367319B (en) * | 2021-12-30 | 2023-10-10 | 江苏大学 | Particle control device and method based on low-frequency vibration probe |
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