CN108704685B - Polydisperse asynchronous droplet generation system - Google Patents
Polydisperse asynchronous droplet generation system Download PDFInfo
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- CN108704685B CN108704685B CN201810831533.2A CN201810831533A CN108704685B CN 108704685 B CN108704685 B CN 108704685B CN 201810831533 A CN201810831533 A CN 201810831533A CN 108704685 B CN108704685 B CN 108704685B
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- asynchronous
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/0241—Drop counters; Drop formers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/12—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of liquids or gases
Abstract
A polydisperse asynchronous droplet generation system comprises an asynchronous droplet generator, a liquid supply device and an external driving device; the asynchronous drop generator includes a drop generating assembly: the infusion tube assembly comprises at least two infusion tubes, and the piezoelectric crystal is fixed on the outer side wall of each infusion tube; the lower opening end of the pipeline connector is provided with a sealing gasket, the sealing gasket is provided with fixed jacks the same as the infusion tubes in number, and the infusion tubes are inserted on the sealing gasket; the insulating shell comprises a columnar cavity, an upper metal plate and a lower metal plate; the pipeline connector and the wire connector are inserted and fixed on the upper metal plate; the piezoelectric crystal is connected with an external driving device through a wire connector respectively; the end of the infusion tube reaches the outside of the insulating shell through the infusion tube through hole. The invention can generate high-frequency asynchronous polydisperse liquid drops with uniform and stable liquid drop size by presetting parameters such as frequency, fluid flow, pressure and the like.
Description
Technical Field
The invention relates to a multi-drop impact experiment system, in particular to a polydisperse asynchronous drop generation system.
Background
The droplet impact phenomenon belongs to a typical free surface flow problem, widely exists in nature, agriculture and engineering technology, depends on simulation and physical testing, and is mainly simulated in the droplet impact fields Liang Gangtao, wei Lan, yu Huan, gu Xiaojuan and the like. The main reason is that the multi-drop impact experiment has higher requirements on the experimental key equipment, namely a drop generator. The existing droplet generation system is suitable for single droplet impact experiments, but the development of the multi-droplet generation device is still in a starting stage. The multi-droplet generating device used by many scholars in the spray experiment is self-refitted, and has the advantages of complex structure, large volume, high manufacturing cost, poor controllability of droplet generation frequency, incapability of generating uniform polydisperse droplets and incapability of generating asynchronous polydisperse droplet arrays. There are some patent technologies related to single droplet dispersion in China, but there are few descriptions of synchronous or asynchronous multi-droplet generators.
Disclosure of Invention
The invention aims to provide a polydisperse asynchronous droplet generation system which has a simple structure and a small volume and can realize an asynchronous polydisperse droplet array.
The invention solves the problems in the prior art by adopting the technical scheme that: a polydisperse asynchronous droplet generation system comprises an asynchronous droplet generator, a liquid supply device and an external driving device; the asynchronous droplet generator comprises an insulating shell and a droplet generation assembly arranged in the insulating shell; the liquid drop generating assembly comprises a pipeline connector, an infusion tube assembly and piezoelectric crystals, wherein the infusion tube assembly comprises at least two infusion tubes, and the piezoelectric crystals are fixed on the outer side wall of each infusion tube; the lower opening end of the pipeline connector is covered and fixed with sealing gaskets, the sealing gaskets are provided with fixing jacks the same as the infusion tubes in number, and the infusion tubes are fixedly spliced on the sealing gaskets through the fixing jacks and are communicated with the pipeline connector; the insulating shell comprises a columnar cavity body which is wrapped outside the liquid drop generating assembly and is open at two ends, and an upper metal plate and a lower metal plate which are positioned at two open ends; the pipeline connector and the wire connector are inserted and fixed on the upper metal plate, and the upper opening end of the pipeline connector is connected with the liquid supply device; the piezoelectric crystals are respectively connected with an external driving device through lead wires and lead wire connectors; the lower metal plate is provided with a transfusion tube through hole matched with the end part of the transfusion tube, so that the end part of the transfusion tube reaches the outside of the insulating shell through the transfusion tube through hole.
And the outer side of the infusion tube assembly is sleeved with an elastic sleeve, and the elastic sleeve is positioned at the lower opening end of the pipeline connector.
The inner side wall of the columnar cavity is provided with a wire channel which is communicated with the wire connector, and the piezoelectric crystal on each infusion tube is connected with an external driving device through wires through the wire channel and the wire connector.
The number of external driving devices is matched with the number of infusion tubes so that the piezoelectric crystal on each infusion tube is connected with one external driving device.
The liquid supply device comprises a liquid injection pump which is connected with the upper opening end of the pipeline connector through a filter, a valve and a pressure gauge in sequence.
The external driving device is a function generator.
The columnar cavity is an ABS columnar cavity, and is a columnar shell formed by splicing two semi-cylindrical shells.
The invention has the beneficial effects that: the invention has simple structure, which is mainly composed of an asynchronous drop generator, and a liquid injection pump, a filter, a valve, a pressure gauge and a function generator which are connected with the asynchronous drop generator in a matching way, wherein the asynchronous drop generator is used as a main component of the whole system, a plurality of infusion tubes are fixed at the end part of a pipeline connector in the structure, a piezoelectric crystal is arranged on the outer side wall of each infusion tube, and the effect of asynchronous drops is generated by the infusion tube assembly by respectively applying different vibration frequencies to the piezoelectric crystal on the infusion tube in the infusion tube assembly. The invention can generate liquid drops with different distributions, different frequencies, different speeds and different diameters by presetting parameters such as frequency, fluid flow, pressure and the like, and the liquid drops have uniform and stable sizes. The generated high-frequency asynchronous polydisperse liquid drops can meet the shooting requirement of a high-speed camera in the research of liquid drop impact.
Drawings
Fig. 1 is a schematic diagram of the system architecture of the present invention.
Fig. 2 is a schematic diagram of the structure of an asynchronous droplet generator in the present invention.
Fig. 3 is a schematic view of the structure of the droplet generation module in the present invention.
Fig. 4 is a top view of fig. 2.
FIG. 5 is a schematic view of the structure of the infusion tube of the present invention.
In the figure: 1-asynchronous drop generator, 2-liquid injection pump, 3-filter, 4-valve, 5-manometer, 6-function generator, 7-insulating housing, 8-infusion tube assembly, 9-pipe connector, 10-piezoelectric crystal, 11-infusion tube, 12-infusion tube fixed end, 13-sealing gasket, 14-rubber sleeve, 15-upper metal plate, 16-lower metal plate, 17-wire connector, 18-wire channel, 19-wire.
Detailed Description
The invention is described below with reference to the drawings and the detailed description:
FIG. 1 is a schematic diagram of a system architecture of a polydisperse asynchronous droplet generation system according to the present invention. The invention relates to a polydisperse asynchronous droplet generation system, which comprises an asynchronous droplet generator 1, a liquid supply device and an external driving device, wherein the liquid supply device is specifically a liquid injection pump 2, and the liquid injection pump 2 is connected with the upper opening end of a pipeline connector 9 in the asynchronous droplet generator 1 of the invention through a filter 3, a valve 4 and a pressure gauge 5 in sequence; the external driving means is in particular a function generator 6. The function generator 6 is adapted to be connected to a wire connector 17 in the asynchronous droplet generator 1 according to the invention.
Fig. 2 is a schematic diagram of the structure of an asynchronous droplet generator. The asynchronous droplet generator 1 in the present invention includes an insulating housing 7 and a droplet generation assembly mounted in the insulating housing 7. Fig. 3 shows a specific structure of the droplet generation assembly: the droplet generation assembly comprises a pipeline connector 9, a transfusion tube assembly 8 and a piezoelectric crystal 10. The infusion tube assembly 8 comprises at least two infusion tubes 11, and a piezoelectric crystal 10 (shown in fig. 5) can be fixed on the outer side wall of each infusion tube 11 by adopting silver-based conductive epoxy resin, wherein the piezoelectric crystal 10 can adopt a square or annular piezoelectric crystal; the lower opening end of the pipeline connector 9 is provided with a transfusion tube fixing end 12, a sealing gasket 13 is arranged in the transfusion tube fixing end 12, the sealing gasket 13 covers and is fixed at the lower opening end of the pipeline connector 9, the sealing gasket 13 is provided with fixing jacks which are the same as the transfusion tubes 11 in number, the transfusion tubes 11 are fixedly spliced on the sealing gasket 13 through the fixing jacks, each transfusion tube 11 is communicated with the pipeline connector 9, the sealing gasket 13 can achieve a good sealing effect, and when liquid supply is effectively avoided, the liquid flows out along the outer side wall of the transfusion tube 11; to strengthen the infusion tube assembly 8, a rubber sleeve 14 is sleeved outside the infusion tube assembly 8, and the rubber sleeve 14 is positioned at the lower opening end of the pipeline connector 9.
The insulating housing 7 includes a columnar cavity body which is wrapped outside the droplet generation module and has both ends open, and an upper metal plate 15 and a lower metal plate 16 which are positioned at both open ends of the columnar cavity body. The cylindrical cavity is specifically an ABS cylindrical cavity, as shown in fig. 2, and is a cylindrical shell formed by splicing two semi-cylindrical shells. As shown in fig. 4, the pipe connector 9 in the droplet generation module is inserted and fixed on the upper metal plate 15 in a threaded connection manner, so that the upper opening end of the pipe connector 9 is connected with the liquid supply device; the upper metal plate 15 is also fixedly connected with a wire connector 17 communicated with the columnar cavity in a plugging manner in a threaded connection manner, so as to protect the line damage to the greatest extent and ensure the wiring regularity, preferably, a wire channel 18 is arranged on the inner side wall of the columnar cavity, the wire channel 18 is communicated with the wire connector 17, the piezoelectric crystal 10 on each infusion tube 11 is connected with the function generator 6 through the wire channel 18 and the wire connector 17 respectively through wires 19, specifically, the number of the function generators 6 is matched with the number of the infusion tubes 11, and the piezoelectric crystal 10 on each infusion tube 11 is connected with the corresponding function generator 6 so as to control the piezoelectric crystal 10 on each infusion tube 11 to periodically and mechanically vibrate at different frequencies to realize the effect of asynchronous liquid drops. The lower metal plate 16 is provided with a transfusion tube through hole which is matched with the end part of the transfusion tube 11 so that the end part of the transfusion tube 11 reaches the outside of the insulating housing 7 through the transfusion tube through hole.
The action principle of the invention is as follows: the liquid in the liquid injection pump 2 is extruded under the action of pump power, as shown in fig. 1, and enters the liquid delivery pipes 11 of the asynchronous liquid drop generator 1 through the filter 3 and the valve 4, meanwhile, the function generator 6 generates electric signals to induce the piezoelectric crystals 10 on each liquid delivery pipe 11 to generate periodic mechanical vibration with different frequencies, and the periodic mechanical vibration is transmitted to the liquid in the pipe through the liquid delivery pipes 11, so that the liquid in each liquid delivery pipe 11 is crushed into uniform liquid drops under the effect of Rayleigh instability after being ejected from the pipe, and the liquid drops can be generated because the liquid pipes are respectively controlled by the piezoelectric crystals 10 with different frequencies. Wherein the number of arrays of droplets is determined by the number of infusion tubes 11; according to practical situations, if a layer of orifice plate is covered at the end of the infusion tube 11, the array number of the liquid drops is determined by the orifice number of the orifice plate, and the liquid drop size is related to the pipe diameter of the infusion tube 11 or the orifice diameter and the fluid type, so that the size and the array number of the liquid drops to be generated can be changed by replacing the infusion tube 11 with different pipe diameters or orifice plates with different orifice numbers and diameters. Thereby achieving the effect of asynchronous droplets.
The above is a further detailed description of the invention in connection with specific preferred embodiments, and it is not to be construed as limiting the practice of the invention to these descriptions. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (5)
1. A polydisperse asynchronous droplet generation system is characterized by comprising an asynchronous droplet generator, a liquid supply device and an external driving device; the asynchronous droplet generator comprises an insulating shell and a droplet generation assembly arranged in the insulating shell; the liquid drop generating assembly comprises a pipeline connector, an infusion tube assembly and piezoelectric crystals, wherein the infusion tube assembly comprises at least two infusion tubes, and the piezoelectric crystals are fixed on the outer side wall of each infusion tube; the lower opening end of the pipeline connector is covered and fixed with sealing gaskets, the sealing gaskets are provided with fixing jacks the same as the infusion tubes in number, and the infusion tubes are fixedly spliced on the sealing gaskets through the fixing jacks and are communicated with the pipeline connector; the insulating shell comprises a columnar cavity body which is wrapped outside the liquid drop generating assembly and is open at two ends, and an upper metal plate and a lower metal plate which are positioned at two open ends; the columnar cavity is an ABS columnar cavity, and is a columnar shell formed by splicing two semi-cylindrical shells; the pipeline connector and the wire connector are inserted and fixed on the upper metal plate, and the upper opening end of the pipeline connector is connected with the liquid supply device; the piezoelectric crystals are respectively connected with an external driving device through lead wires and lead wire connectors; the lower metal plate is provided with a transfusion tube through hole matched with the end part of the transfusion tube, so that the end part of the transfusion tube reaches the outside of the insulating shell through the transfusion tube through hole; the external driving device is a function generator, so that the electric signals generated by the function generator induce the piezoelectric crystals on each infusion tube to generate periodic mechanical vibration with different frequencies, the periodic mechanical vibration is transmitted to liquid in the tube through the infusion tube, and the liquid in each infusion tube is broken into uniform liquid drops under the effect of Rayleigh instability after being ejected from the tube.
2. The system of claim 1, wherein the flexible sleeve is positioned outside the tubing assembly such that the flexible sleeve is positioned at the lower open end of the tubing connector.
3. The system of claim 1, wherein the inner side wall of the cylindrical cavity is provided with a wire channel, the wire channel is in communication with the wire connector, and the piezoelectric crystal on each infusion tube is connected to the external driving device through the wire channel and the wire connector respectively.
4. The system of claim 1, wherein the number of external driving devices is adapted to the number of infusion tubes such that the piezoelectric crystal on each infusion tube is connected to one external driving device.
5. The system of claim 1, wherein the fluid supply device comprises a fluid injection pump connected to the upper open end of the tubing connector sequentially through a filter, a valve, and a pressure gauge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810831533.2A CN108704685B (en) | 2018-07-26 | 2018-07-26 | Polydisperse asynchronous droplet generation system |
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| CN201810831533.2A CN108704685B (en) | 2018-07-26 | 2018-07-26 | Polydisperse asynchronous droplet generation system |
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| CN108704685A CN108704685A (en) | 2018-10-26 |
| CN108704685B true CN108704685B (en) | 2023-10-03 |
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| CN114833013A (en) * | 2022-04-29 | 2022-08-02 | 杭州电子科技大学 | Piezoelectric type monodisperse droplet generation device and generation method thereof |
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| CN104450891A (en) * | 2014-11-17 | 2015-03-25 | 中国科学院微生物研究所 | Method and system for digital quantitative analysis of nucleic acid amplification based on micro-droplet |
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| CN208839612U (en) * | 2018-07-26 | 2019-05-10 | 大连理工大学 | A kind of asynchronous drop generating system of polydispersion |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10336110B4 (en) * | 2003-08-06 | 2008-01-03 | Proteros Biostructures Gmbh | Apparatus and method for treating a protein crystal |
| DK2665557T3 (en) * | 2011-01-21 | 2020-04-06 | Biodot Inc | Piezoelectric dispenser with a longitudinal transducer and interchangeable capillary tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1346301A (en) * | 1965-06-04 | 1974-02-06 | Adler Auto Precision Ltd | Methods for mixing and or dispensing liquids and apparatus therefor |
| KR20040043661A (en) * | 2002-11-19 | 2004-05-24 | 대한민국(서울산업대학교총장) | apparatus for getting a desired number of droplets |
| CN103460018A (en) * | 2011-02-04 | 2013-12-18 | 塞通诺米/St有限责任公司 | Particle sorting apparatus and method |
| CN104450891A (en) * | 2014-11-17 | 2015-03-25 | 中国科学院微生物研究所 | Method and system for digital quantitative analysis of nucleic acid amplification based on micro-droplet |
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| CN107070293A (en) * | 2017-05-23 | 2017-08-18 | 中国科学技术大学 | The microlayer model active preparation facilities and method disturbed based on piezoelectricity singing piece |
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