CN214020689U - Micro-droplet active preparation device based on piezoelectric ceramic disturbance - Google Patents
Micro-droplet active preparation device based on piezoelectric ceramic disturbance Download PDFInfo
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- CN214020689U CN214020689U CN202023045067.7U CN202023045067U CN214020689U CN 214020689 U CN214020689 U CN 214020689U CN 202023045067 U CN202023045067 U CN 202023045067U CN 214020689 U CN214020689 U CN 214020689U
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Abstract
The utility model discloses a micro-droplet active preparation device based on piezoelectric ceramic disturbance, relating to the technical field of micro-flow control; the liquid-driven flow focusing device comprises a liquid-driven flow focusing device, wherein the top of the liquid-driven flow focusing device is connected with a fixed seat through a fixed support, and the bottom of the fixed seat is fixedly connected with a piezoelectric ceramic part; the liquid-driven flowing focusing device comprises a container, a cavity is arranged above the container, a piezoelectric base is arranged above the cavity, a through hole which is communicated up and down is formed in the middle of the piezoelectric base, a polytetrafluoroethylene film is fixedly arranged above the through hole, and a needle head which penetrates through the cavity is arranged below the through hole; a microdroplet phase inlet communicated with the through hole is formed in one side of the piezoelectric base; and the vibration end at the bottom of the piezoelectric ceramic part is in contact connection with the polytetrafluoroethylene film. The utility model discloses a little liquid drop initiative preparation facilities based on piezoceramics disturbance makes the flow stable, and the little liquid drop size degree of consistency of generation is good.
Description
Technical Field
The utility model relates to a micro-fluidic technology field especially relates to a little liquid drop initiative preparation facilities based on piezoceramics disturbance.
Background
The formation of droplets is illustrative of the complexity of microfluidic processing. The relatively small forces associated with surface tension create a high degree of non-linearity in the droplet formation process and are exceptionally sensitive to external disturbances. The formation of droplets from a continuous liquid phase requires the introduction of energy that is converted to surface energy upon droplet formation. When the energy is only from the fluid pressure and no external energy is input, the passive control is performed; in contrast, in the droplet generation process, external energy input is active control. The classical structure of passive control is: t-type and flow-focusing type. Passive control of both structures is achieved primarily by varying flow or pressure. The biggest problems of passive control are: the response time is too long, typically a few seconds or even minutes. The longer response time is mainly limited by the relatively large fluid resistance. At preset flow rates and pressures, the only way to obtain a droplet of a specific size is to adjust the liquid properties and the shape of the channel. According to different types of external input energy, the active control generation of droplets is mainly divided into: thermal control, magnetic control, gas/liquid drive control, piezoelectric control, and the like. Since the piezoelectric drive has a fast response, which can reach 200 μ s in general, the research on the preparation of micro-droplets by piezoelectric active excitation is receiving more and more attention, and the introduction of the piezoelectric perturbation is mainly directed to the micro-fluidic chip, such as the vibration of a piezoelectric wafer, a piezoelectric bimorph or a piezoelectric stack, on an inlet pipeline to control the volume and frequency of the formation of the micro-droplets. Compared with the micro-droplet preparation of a micro-fluidic chip, the micro-droplet preparation utilizing liquid-driven flow focusing has many advantages, such as low cost, high encapsulation efficiency, high yield and the like. The micro-droplets generated by the two-dimensional planar microfluidic chip technology are often deformed by contacting with the cavity wall, and the micro-droplets generated by the three-dimensional liquid-drive-based flow focusing device have small influence on external disturbance in a liquid environment, and the wettability problem is further improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a little liquid drop initiative preparation facilities based on piezoceramics disturbance to solve the problem that above-mentioned prior art exists, make the flow stable, the little liquid drop size degree of consistency of generation is good.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a micro-droplet active preparation device based on piezoelectric ceramic disturbance, which comprises a liquid-driven flowing focusing device, wherein the top of the liquid-driven flowing focusing device is connected with a fixed seat through a fixed support, and the bottom of the fixed seat is fixedly connected with a piezoelectric ceramic part; the liquid-driven flowing focusing device comprises a container, a cavity is arranged above the container, a piezoelectric base is arranged above the cavity, a through hole which is communicated up and down is formed in the middle of the piezoelectric base, a polytetrafluoroethylene film is fixedly arranged above the through hole, and a needle head which penetrates through the cavity is arranged below the through hole; a microdroplet phase inlet communicated with the through hole is formed in one side of the piezoelectric base; and the vibration end at the bottom of the piezoelectric ceramic part is in contact connection with the polytetrafluoroethylene film.
Optionally, the needle head is a tapered structure with gradually decreasing size from top to bottom.
Optionally, the piezoelectric ceramic portion includes a housing connected to the fixing base, piezoelectric ceramic is stacked in the housing, a vibration end is connected to the bottom of the piezoelectric ceramic, the vibration end is fixedly arranged at the bottom of the housing through a pre-tightening mechanical structure, and a coaxial cable connected to the piezoelectric ceramic is arranged on one side of the housing in a penetrating manner.
Optionally, the bottom of the fixing support is fixedly connected with the top of the piezoelectric base.
Optionally, the cross-sectional structures of the container, the cavity and the piezoelectric base are the same.
Optionally, the housing is made of stainless steel.
Optionally, the bottom of the fixed seat is fixedly connected with a threaded base, and the top of the shell is fixedly connected with the threaded base; the top of the piezoelectric ceramic is fixedly connected with the bottom of the threaded base.
The utility model discloses for prior art gain following technological effect:
the utility model discloses a through-hole top on piezoelectric substrate sets up piezoceramics, and the vibration energy through piezoceramics passes through the fluid that polytetrafluoroethylene film transmitted to in the pipeline, and the vibration energy realizes the disturbance at the in-process that forms toper and efflux post, and then prepares out the micro-droplet, and through control piezoceramics's driving voltage, the micro-droplet size and the frequency of generation that the efflux post breakage produced can be controlled to driving frequency or drive waveform, and stability is good, and the droplet size is even.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of positions of a piezoelectric base and a piezoelectric ceramic part of a micro-droplet active preparation device based on piezoelectric ceramic disturbance according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a micro-droplet active preparation device based on piezoelectric ceramic disturbance according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional structure diagram of a piezoelectric ceramic part provided in an embodiment of the present invention;
in the figure: 1-piezoelectric base, 2-polytetrafluoroethylene film, 3-fixed base, 4-fixed support, 5-piezoelectric ceramic part, 6-micro-droplet phase inlet, 7-cavity, 8-container, 9-needle, 10-jet column, 11-threaded base, 12-coaxial cable, 13-shell, 14-pre-tightening mechanical structure, 15-piezoelectric ceramic and 16-vibrating end.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a little liquid drop initiative preparation facilities based on piezoceramics disturbance to solve the problem that above-mentioned prior art exists, make the flow stable, the little liquid drop size degree of consistency of generation is good.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
The utility model provides a micro-droplet active preparation device based on piezoelectric ceramic disturbance, as shown in figures 1-3, comprising a three-dimensional liquid-driven flowing focusing device, wherein the top of the liquid-driven flowing focusing device is connected with a horizontally arranged fixed seat 3 through a fixed support 4, and the middle position at the bottom of the fixed seat 3 is fixedly connected with a piezoelectric ceramic part 5; the liquid-driven flow focusing device comprises a container 8, a cavity 7 is arranged above the container 8, a piezoelectric base 1 is arranged above the cavity 7, a through hole which is communicated up and down is formed in the middle of the piezoelectric base 1, the through hole is positioned under a piezoelectric ceramic part 5, a polytetrafluoroethylene film 2 is fixedly arranged above the through hole, a needle head 9 which penetrates through the cavity 7 is arranged below the through hole, the needle head 9 is designed and manufactured into a conical structure with a gradually reduced opening at the lower end by adopting a computer digital control precision machining method, and the conical structure penetrates through the cavity 7; a microdroplet phase inlet 6 communicated with the through hole is formed in one side of the piezoelectric base 1, and the microdroplet phase inlet 6 is used for introducing fluid into the piezoelectric base 1 and the needle head 9; the vibration end 16 at the bottom of the piezoelectric ceramic part 5 is in contact connection with the polytetrafluoroethylene film 2.
Further preferably, the piezoelectric ceramic part 5 includes a housing 13 connected to the fixing base 3, a piezoelectric ceramic 15 is stacked in the housing 13, a vibration end 16 is connected to the bottom of the piezoelectric ceramic 15, the vibration end 16 is fixedly inserted into the bottom of the housing 13 through a pre-tightening mechanical structure 14, and a coaxial cable 12 connected to the piezoelectric ceramic 15 is inserted into one side of the housing 13. The teflon film 2 is blocked between the vibrating end 16 of the piezoelectric ceramic part 5 and the fluid in the piezoelectric base 1. The bottom of the fixed support 4 is fixedly connected with the top of the piezoelectric base 1. The cross-sectional structures of the container 8, the cavity 7 and the piezoelectric base 1 are the same. The housing 13 is made of stainless steel. The bottom of the fixed seat 3 is fixedly connected with a threaded base 11, and the top of the shell 13 is fixedly connected with the threaded base 11; the top of the piezoelectric ceramic 15 is fixedly connected with the bottom of the threaded base 11.
When the utility model works, fluid is introduced from the micro-droplet phase inlet 6, the fluid is introduced into the container 8 through the needle 9 to form a jet column 10, and the coaxial cable 12 supplies power to the piezoelectric ceramic 15; specifically, the needle 9 provides shearing force to the micro-droplet phase introduced through the pipeline to form a stable cone, the micro-droplet phase further passes through the round hole at the bottom of the cavity 7 to form a jet column 10, and the liquid in the container 8 flows out through the outlet. When the pressure electric ceramics is disturbed, the vibration energy is transferred to the fluid in the pipeline through the polytetrafluoroethylene film 2, and the disturbance effect is realized by the vibration energy in the process of forming the conical shape and the jet flow column; controlling the size and the generation frequency of micro-droplets generated by the jet column crushing by controlling the driving voltage, the driving frequency or the driving waveform of the piezoelectric ceramic; controlling the size and the generation frequency of micro liquid drops generated by the crushing of the jet flow column 10 by controlling the driving voltage, the driving frequency or the driving waveform of the piezoelectric ceramic 15, wherein the driving voltage is less than the breakdown voltage of the piezoelectric device, and the driving waveform is any one of sine waves, square waves or sawtooth waves; the whole process has stable flow and uniform micro-droplets.
The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (7)
1. A micro-droplet active preparation device based on piezoelectric ceramic disturbance is characterized in that: the liquid-driven flow focusing device comprises a liquid-driven flow focusing device, wherein the top of the liquid-driven flow focusing device is connected with a fixed seat through a fixed support, and the bottom of the fixed seat is fixedly connected with a piezoelectric ceramic part; the liquid-driven flowing focusing device comprises a container, a cavity is arranged above the container, a piezoelectric base is arranged above the cavity, a through hole which is communicated up and down is formed in the middle of the piezoelectric base, a polytetrafluoroethylene film is fixedly arranged above the through hole, and a needle head which penetrates through the cavity is arranged below the through hole; a microdroplet phase inlet communicated with the through hole is formed in one side of the piezoelectric base; and the vibration end at the bottom of the piezoelectric ceramic part is in contact connection with the polytetrafluoroethylene film.
2. The active micro-droplet preparation device based on piezoceramic perturbation of claim 1, wherein: the needle head is of a conical structure with the size gradually reduced from top to bottom.
3. The active micro-droplet preparation device based on piezoceramic perturbation of claim 1, wherein: the piezoelectric ceramic part comprises a shell connected with the fixing seat, piezoelectric ceramic is stacked in the shell, the bottom of the piezoelectric ceramic is connected with a vibration end, the vibration end is fixedly arranged at the bottom of the shell in a penetrating mode through a pre-tightening mechanical structure, and a coaxial cable connected with the piezoelectric ceramic is arranged on one side of the shell in a penetrating mode.
4. The active micro-droplet preparation device based on piezoceramic perturbation of claim 1, wherein: the bottom of the fixed support is fixedly connected with the top of the piezoelectric base.
5. The active micro-droplet preparation device based on piezoceramic perturbation of claim 1, wherein: the cross-sectional structures of the container, the cavity and the piezoelectric base are the same.
6. The active micro-droplet preparation device based on piezoceramic perturbation of claim 3, wherein: the shell is made of stainless steel.
7. The active micro-droplet preparation device based on piezoceramic perturbation of claim 3, wherein: the bottom of the fixed seat is fixedly connected with a threaded base, and the top of the shell is fixedly connected with the threaded base; the top of the piezoelectric ceramic is fixedly connected with the bottom of the threaded base.
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| CN202023045067.7U CN214020689U (en) | 2020-12-17 | 2020-12-17 | Micro-droplet active preparation device based on piezoelectric ceramic disturbance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114345234A (en) * | 2022-01-10 | 2022-04-15 | 北京航空航天大学 | Droplet generator based on water hammer effect and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114345234A (en) * | 2022-01-10 | 2022-04-15 | 北京航空航天大学 | Droplet generator based on water hammer effect and working method thereof |
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